WO2022222083A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2022222083A1
WO2022222083A1 PCT/CN2021/088802 CN2021088802W WO2022222083A1 WO 2022222083 A1 WO2022222083 A1 WO 2022222083A1 CN 2021088802 W CN2021088802 W CN 2021088802W WO 2022222083 A1 WO2022222083 A1 WO 2022222083A1
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WO
WIPO (PCT)
Prior art keywords
light source
backlight module
light
guide plate
degrees
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/088802
Other languages
English (en)
French (fr)
Inventor
朱贺玲
翟跃
桑建
韩锐
崔栋
张志鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd, Beijing BOE Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN202180000845.9A priority Critical patent/CN115720643B/zh
Priority to PCT/CN2021/088802 priority patent/WO2022222083A1/zh
Priority to EP21937326.3A priority patent/EP4206806B1/en
Priority to US17/781,188 priority patent/US12158641B2/en
Publication of WO2022222083A1 publication Critical patent/WO2022222083A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1323—Arrangements for providing a switchable viewing angle
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133626—Illuminating devices providing two modes of illumination, e.g. day-night
    • G02F1/133627—Projection-direct viewing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133626—Illuminating devices providing two modes of illumination, e.g. day-night

Definitions

  • the present application relates to the field of display technology, and in particular, to a backlight module and a display device.
  • the display device needs to have different viewing angles. For example, when multiple people need to see the display screen of the display device from different angles, the viewing angle range of the display device needs to be larger, so that the display device is in the sharing mode; when the content of the display screen needs to be kept secret and only visible to the users themselves , the viewing angle range of the display device needs to be small, so that the display device is in the privacy mode.
  • the display device when the display device is in the sharing mode, generally, when the angle between the viewing direction of the human eye and the normal line of the display surface of the display device is small, the brightness of the observed display screen is relatively high. , and when the angle between the viewing direction of the human eye and the normal line of the display surface of the display device is larger, the observed brightness of the display image is lower. In this way, when the display device is in the sharing mode, the display effect of the display device is poor.
  • Embodiments of the present application provide a backlight module and a display device.
  • the display device in the prior art is in the sharing mode, the problem of poor display effect of the display device can be solved, and the technical solution is as follows:
  • a backlight module comprising:
  • a first light source the first light source is located on the side of the first light guide plate, and the orthographic projections of the first light source and the first light guide plate on the plane where the light exit surface of the surface light source is located do not overlap .
  • the first light source is a strip light source
  • the first mesh point is a prism structure, and the length direction of the first mesh point is parallel to the extension direction of the light source bar of the first light source;
  • the first mesh point is a triangular prism structure, and the first mesh point has a first side surface that is in contact with the first light guide plate, and a second side surface and a third side surface that are connected to the first side surface.
  • the first side surface There is a first included angle with the second side surface, a second included angle between the first side surface and the third side surface, and a third included angle between the second side surface and the third side surface.
  • the width of the first side in the length direction of the first screen dots ranges from 35 microns to 100 microns, and the width of the first side in the length direction perpendicular to the first screen dots is in the range of 35 microns to 100 microns. The range is 20 microns to 100 microns.
  • the value range of the first included angle is 20 degrees to 70 degrees, and the second included angle is less than or equal to 20 degrees.
  • the chamfer is a circular arc, and the radius of the circular arc is less than or equal to 30 microns.
  • the surface light source is a collimated surface light source.
  • the collimating surface light source includes a privacy protection structure and a second light guide plate stacked in the thickness direction;
  • the second light guide plate is located on the side of the privacy protection structure away from the first light guide plate, and the side of the second light guide plate away from the privacy protection structure has a plurality of second mesh points;
  • the collimating surface light source further includes a second light source, the second light source is located on the side of the second light guide plate, and the second light source and the second light guide plate are on the plane where the light emitting surface of the collimating surface light source is located
  • the orthographic projections do not overlap.
  • the privacy protection structure includes: a first substrate, and a plurality of strip-shaped first prisms located on the first substrate, and the plurality of first prisms are located close to the first substrate one side of the second light guide plate.
  • the second light source is a bar-shaped light source, and the extension direction of the light source bar of the second light source is the same as the extension direction of the light source bar of the first light source;
  • the length direction of the plurality of first prisms is parallel to the extending direction of the light source bars of the second light source.
  • the first prism is a triangular prism structure, and the first prism has a fourth side surface in contact with the first substrate, and a fifth side surface and a sixth side surface connected with the fourth side surface;
  • the fourth angle between the fourth side and the fifth side is greater than or equal to the fifth angle between the fourth side and the sixth side, and the The fourth side is closer to the second light source relative to the fifth side.
  • the angle range of the fourth included angle is 45 degrees to 90 degrees, and the angle of the fifth included angle is 45 degrees to 70 degrees.
  • the angle range of the fourth included angle is 60 degrees to 72 degrees, and the angle range of the fourth included angle is 53 degrees to 57 degrees.
  • the chamfer is a circular arc, and the radius of the circular arc is less than or equal to 30 microns.
  • the privacy protection structure further includes: a particle diffusion layer, the particle diffusion layer includes: a transparent film layer and a plurality of particles located in the transparent film layer;
  • the transparent film layer is the first substrate, or the transparent film layer is a film layer on the side of the first substrate away from the plurality of first prisms.
  • the concentration of the particles in the transparent film layer ranges from 10% to 90%.
  • the second mesh point is a triangular prism structure, and the length direction of the second mesh point is parallel to the extension direction of the light source strip of the second light source;
  • the second mesh point has a seventh side surface in contact with the second light guide plate, and an eighth side surface and a ninth side surface connected with the seventh side surface;
  • the width of the fourth side in the length direction of the second dots ranges from 35 microns to 100 microns, and the width of the fourth side in the length direction perpendicular to the second dots The range is 20 microns to 100 microns.
  • the seventh included angle is greater than the eighth included angle, and the eighth side surface of the second dot is close to the second light source relative to the ninth side surface.
  • the angle range of the seventh included angle is 10 degrees to 90 degrees, and the eighth included angle is less than or equal to 30 degrees.
  • the angle of the seventh included angle is 26 degrees to 30 degrees, and the eighth included angle is less than or equal to 5 degrees.
  • a chamfer exists at a ninth angle between the eighth side surface and the ninth side surface, the chamfer is a circular arc, and the radius of the circular arc is less than or equal to 30 microns.
  • the radius of the arc is less than or equal to 5 microns.
  • the shape and size of the first mesh point and the second mesh point are the same.
  • the privacy protection structure includes: a grating structure.
  • the collimating surface light source further includes: a reflection sheet located on the side of the second light guide plate away from the privacy protection structure.
  • the collimating surface light source further includes: a second substrate located between the second light guide plate and the reflective sheet, and a plurality of strip-shaped second prisms located on the second substrate , the second prism is located on the side of the second substrate close to the second light guide plate, and the length direction of the plurality of second prisms is perpendicular to the extension direction of the light source bars of the second light source.
  • the side of the first light guide plate away from the plurality of first mesh points has a plurality of strip-shaped third prisms
  • the side of the second light guide plate away from the plurality of second mesh points has a plurality of stripe-shaped third prisms.
  • the length directions of the plurality of third prisms and the length directions of the plurality of fourth prisms are both perpendicular to the extending direction of the light source strips of the second light source.
  • the backlight module further includes: a frame body; the first light guide plate, the second light guide plate, the anti-peep structure, the first light source and the second light source are all located in the inside the frame.
  • the frame body includes: a back plate, the back plate has a first groove, a second groove and a third groove that are communicated in sequence, and the opening surface of the first groove is connected to the second groove.
  • the bottom surface of the groove is coplanar, and the opening surface of the second groove is coplanar with the bottom surface of the third groove;
  • the reflective sheet is located in the first groove
  • the second light guide plate and the second light source are both located in the second groove
  • the first light guide plate and the first light source are both located in the second groove in the third groove.
  • the frame body further includes: a plastic frame connected to the edge of the backplane, the plastic frame has a panel bearing portion, and the panel bearing portion is used for bearing the display panel.
  • the first light source and the second light source are located on the same side of the frame body, or the first light source and the second light source are respectively located on opposite sides of the frame body.
  • a display device comprising:
  • a display panel and the above-mentioned backlight module.
  • the backlight module includes:
  • a surface light source, a first light guide plate and a first light source Since in the backlight module, the first light guide plate is located on the light-emitting side of the surface light source, the light emitted by the first light source can be emitted from the backlight module only after being reflected by the first screen point without passing through other film layers. . In this way, the loss of the light emitted by the first light source during the propagation process is reduced, the brightness of the light in the secondary viewing angle area when the backlight module is in the shared mode is improved, and the display device including the backlight module is further improved in the In the sharing mode, the brightness of the display screen improves the display effect of the display device.
  • FIG. 1 is an exploded view of a backlight module provided by an embodiment of the present application.
  • Fig. 2 is the structural representation of the backlight module shown in Fig. 1 in the X-Z plane;
  • Fig. 3 is the front view of the first mesh point in the X-Z plane in the backlight module shown in Fig. 2;
  • Fig. 4 is the top view of the first screen point shown in Fig. 2 on the X-Y plane;
  • Fig. 5 is another kind of structure schematic diagram of the backlight module shown in Fig. 1 in the X-Z plane;
  • FIG. 6 is an exploded view of another backlight module provided by an embodiment of the present application.
  • Fig. 7 is the structural representation of the backlight module shown in Fig. 6 in the X-Z plane;
  • Fig. 8 is the light path diagram of the backlight module shown in Fig. 6 and Fig. 7 in the second privacy protection mode;
  • Fig. 9 is the light path diagram that the backlight module shown in Fig. 6 and Fig. 7 is in the second sharing mode;
  • FIG. 10 is an exploded view of another backlight module provided by an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of the backlight module shown in FIG. 10 in the X-Z plane;
  • FIG. 12 is a light path diagram of the backlight module shown in FIG. 11 in a second privacy protection mode
  • Fig. 13 is a partial enlarged view of the anti-privacy structure in the backlight module shown in Fig. 11;
  • Fig. 14 is a partial enlarged view of the first prism in the privacy protection structure shown in Fig. 11;
  • FIG. 15 is another schematic structural diagram of the backlight module shown in FIG. 10 in the X-Z plane provided by the embodiment of the present application;
  • FIG. 16 is another schematic structural diagram of the backlight module shown in FIG. 10 in the X-Z plane provided by the embodiment of the present application;
  • Fig. 17 is the light path diagram of the backlight module shown in Fig. 11 in the second sharing mode
  • FIG. 18 is a schematic diagram of the beam distribution of the backlight module shown in FIG. 11 in a second privacy protection mode
  • FIG. 19 is a schematic diagram of the beam distribution of the backlight module shown in FIG. 11 in a second shared mode
  • Figure 20 is a front view of the second dot in the X-Z plane in the backlight module shown in Figure 11;
  • Figure 21 is a top view of the second screen dot shown in Figure 11 on the X-Y plane;
  • Fig. 22 is the light path diagram of the second light guide plate when the angle of the seventh included angle ⁇ 2 is 20 degrees;
  • Figure 24 is a light path diagram of a reflective sheet in the backlight module shown in Figure 11;
  • 25 is a schematic diagram of a viewing angle on the Y-Z plane of a backlight module provided by an embodiment of the present application that does not include a prism layer;
  • Fig. 26 is the light path diagram of the backlight module shown in Fig. 11 in the Y-Z plane;
  • FIG. 27 is a schematic diagram of the beam distribution of a backlight module provided in the embodiment of the present application in the vertical direction of the light-emitting surface of the backlight module;
  • FIG. 28 is a schematic structural diagram of another backlight module in the Y-Z plane provided by an embodiment of the present application.
  • 29 is a schematic structural diagram of another backlight module provided by an embodiment of the present application.
  • FIG. 30 is a schematic structural diagram of still another backlight module provided by an embodiment of the present application.
  • FIG. 31 is a schematic structural diagram of a display device provided by an embodiment of the present application.
  • the current in-vehicle display products mainly include the instrument panel display system (English: Instrument Cluster Display; abbreviation: ICD), the central control display system (English: Central Information Display; abbreviation: CID) located in front of the driver, and the co-pilot.
  • the front display system (English: Co-driver Display; abbreviation: CDD).
  • the ICD display system and the CID display system are mainly used for the driver's operation and viewing, and the CDD display system can display the picture containing entertainment information and the picture containing navigation information.
  • This display mode is defined as the first shared mode.
  • the display mode is the first privacy mode.
  • the CDD display system displays a picture containing entertainment information
  • the CDD display system needs to turn on the anti-peep mode, that is, only the co-pilot can see the display
  • the CDD displays the screen displayed on the system, and the driver's viewing angle is not clearly visible, and this display mode is defined as the second privacy protection mode.
  • the CDD display system needs to turn on the sharing mode, that is, the driver and the co-pilot can watch the screen displayed on the CDD display system at the same time, and Other viewing angles are not clearly visible, and this display mode is defined as the second sharing mode.
  • the included angle between the observation direction of the observer and the normal line of the display surface is small (for example, the included angle is between 0 degrees and ⁇ 20 degrees), it can be considered that the observer observes the display screen in the main viewing angle area;
  • the included angle between the viewing direction of the observer and the normal line of the display surface is large (for example, the included angle is between ⁇ 45 degrees to ⁇ 60 degrees), it can be considered that the observer observes the display screen in the secondary viewing angle area .
  • the co-pilot observes the CDD display system display screen in the main viewing angle area
  • the driver observes the CDD display system display screen in the secondary viewing angle area.
  • FIG. 1 is an exploded view of a backlight module provided by an embodiment of the present application
  • FIG. 2 is a schematic structural diagram of the backlight module shown in FIG. 1 in the X-Z plane.
  • the backlight module may include: a surface light source 000 , a first light guide plate 100 and a first light source 200 .
  • the first light guide plate 100 and the surface light source 000 are stacked in the thickness direction, and the first light guide plate 100 is located on the light exit side of the surface light source 000 .
  • the first light source 200 is located at the side of the first light guide plate 100 , and the orthographic projections of the first light source 200 and the first light guide plate 100 on the plane where the light exit surface of the surface light source 000 is located do not overlap.
  • the thickness direction of the backlight module is the Z direction
  • the light emitting surface of the surface light source 000 is a plane perpendicular to the thickness direction, that is, the X-Y plane.
  • the surface light source 000 is a direct type backlight (eg, Mini-LED backlight) surface light source, or the surface light source 000 is an edge-type backlight surface light source.
  • a direct type backlight eg, Mini-LED backlight
  • the surface light source 000 is an edge-type backlight surface light source.
  • FIG. 2 shows a light path diagram when the surface light source 000 and/or the first light source 200 are turned on.
  • the surface light source 000 can emit light
  • the surface light source 000 has a wide range of lighting angles (for example, the angle between the maximum light-emitting angle and the normal direction of the display surface is less than 90 degrees and greater than -90 degrees;
  • the angle between the maximum light-emitting angle and the normal direction of the display surface is ⁇ 89 degrees; for example, the angle between the maximum light-emitting angle and the normal direction of the display surface is ⁇ 80 degrees; for example, the maximum light-emitting angle and the normal line of the display surface are ⁇ 80 degrees.
  • the included angle of the direction is ⁇ 60 degrees), and the people in the car can see the display screen, and the backlight module is in the first sharing mode at this time.
  • the first light source 200 is turned on and the surface light source 000 is turned off, the light emitted by the backlight module is concentrated in the secondary viewing angle area, and the backlight module is in a large viewing angle mode. In this case, the brightness of the light in the main viewing angle area is low, and the brightness of the light in the sub viewing angle area is high.
  • the display screen of the display device can be observed in the secondary viewing angle area, but it is difficult to observe the display screen of the display device in the main viewing angle area, or the display device can be observed in the main viewing angle area
  • the display screen is not clearly visible, and the backlight module is in the first anti-peep mode at this time. It can be understood that when the surface light source 000 is turned on and the first light source 200 is turned on, the backlight module is in the first sharing mode, and the brightness of the light in the secondary viewing angle area can be further enhanced.
  • the surface light source 000 may be a collimated surface light source.
  • the surface light source 000 is a collimated surface light source
  • the surface light source has a narrow light-emitting angle (for example, the angle between the maximum light-emitting angle and the normal direction of the display surface is ⁇ 30 degrees; for example, the maximum light-emitting angle and the normal line of the display surface are ⁇ 30 degrees;
  • the angle between the directions is ⁇ 20 degrees; for example, the angle between the maximum light exit angle and the normal direction of the display surface is ⁇ 15 degrees).
  • the brightness of the light in the main viewing angle area is high, and the brightness of the light in the sub viewing angle area is low; when the backlight module is integrated in the display device, it can be The display screen of the display device is observed in the main viewing angle area, but it is difficult to observe the display screen of the display device in the sub-viewing angle area, or the display screen of the display device is not clearly visible in the sub-viewing angle area, and the backlight module is in the first position.
  • Two privacy mode is possible.
  • the main viewing angle and the sub-viewing angle can watch the picture displayed on the CDD display system at the same time, and since the surface light source 000 adopts the collimating surface light source, when the backlight module is integrated in the display device In the middle, it is difficult to observe the display screen of the display device in other viewing angle areas other than the main viewing angle and the sub-viewing angle, or the display screen of the display device is not clearly visible in other viewing angle areas, and the backlight module is in the second sharing mode at this time. . It can be understood that when the first light source 200 is turned on and the collimating surface light source 000 is turned off, the backlight module is in the first privacy protection mode at this time.
  • the backlight module provided by the embodiments of the present application includes: a surface light source, a first light guide plate and a first light source. Since in the backlight module, the first light guide plate is located on the light-emitting side of the surface light source, the light emitted by the first light source can be emitted from the backlight module only after being reflected by the first screen point without passing through other film layers. . In this way, the loss of the light emitted by the first light source during the propagation process is reduced, the brightness of the light in the secondary viewing angle area when the backlight module is in the shared mode is improved, and the display device including the backlight module is further improved in the In the sharing mode, the brightness of the display screen improves the display effect of the display device.
  • the first light source 200 is a strip light source; the first dot 101 is a prism structure, and the length direction of the first dot 101 is parallel to the extension direction of the light source bar of the first light source 000 .
  • the first dots 101 are used to break the total reflection of the light emitted by the first light source 200 in the first light guide plate 100, so that the light is emitted from a secondary viewing angle.
  • the first light source 200 may be a light-emitting diode (English: Light-Emitting Diode; abbreviation: LED) light bar.
  • the first light source 200 may include: a plurality of LED light emitting units 200a arranged in a column or an array.
  • the bar-shaped light source means that the overall shape of all the LED light-emitting units of the first light source 200 is a bar-like shape; for example, the first light source 200 may be a rectangular array composed of m ⁇ n LED light-emitting units, with m columns and n rows of LED light-emitting units , where m ⁇ n; the first light source 200 can be designed with m rows of LED light-emitting units distributed along the thickness direction of the first light guide plate 100 , and n rows of LED light-emitting units distributed along the extension direction of the strip light source. It should be noted that the numbers of the LED light-emitting units 200a are not marked in FIG. 2 , but are marked in FIG. 25 later. It can be understood that the strip light source can also be a continuous light source, such as a surface light source or a line light source that emits uniform light.
  • FIG. 3 is a front view of the first screen point in the backlight module shown in FIG. 2 on the XZ plane;
  • FIG. 4 is the first screen point shown in FIG. 2 on the XY plane.
  • the first dot 101 has a triangular prism structure; the first dot 101 has a first side surface 101 a in contact with the first light guide plate 100 , and a second side surface 101 b and a third side surface 101 c connected with the first side surface 100 .
  • third angle ⁇ 1 between the first side 101a and the second side 101b
  • a second angle ⁇ 1 between the first side 101a and the second side 101b
  • third side 101c third angle
  • the shape of the first side surface 101a is a rectangle.
  • the width of the first side surface 101a in the length direction (ie, the Y direction) of the first halftone dot 101 is t
  • the width of the first side surface 101a in the length direction (ie, the X direction) perpendicular to the first halftone dot 101 is t.
  • width is b.
  • the width t of the first side surface 101a may be selected in the range of 35 micrometers to 100 micrometers
  • the width b of the first side surface 101a may be selected in the range of 20 micrometers to 100 micrometers.
  • the width t of the first side 101a can be selected in the range of 35 microns to 100 microns, and the width b of the first side 101 a can be selected in the range of 20 microns to 100 microns, the light can be emitted from the side viewing angle direction, and the dots Not visible.
  • the width t of the first side surface 101a may be one of 35 microns, 45 microns, 50 microns, 55 microns, 60 microns, 65 microns, 75 microns, 80 microns, 90 microns, and 100 microns, and the first side surface 101 a
  • the error range of the width t is ⁇ 0.01 micron
  • the width b of the first side 101a can be 25 microns, 35 microns, 40 microns, 41.7 microns, 45 microns, 45.5 microns, 50 microns, 51.7 microns, 56.3 microns, 53.5 microns, One of 55 microns and 65 microns
  • the error range of the width b of the first side surface 101a is ⁇ 0.02 microns.
  • the range of the first included angle ⁇ 1 may be 20 degrees to 70 degrees, and the range of the second included angle ⁇ 1 may be 2 degrees to 20 degrees.
  • the first included angle ⁇ 1 and the second included angle ⁇ 1 are within the above ranges, the light emitted by the first light source 200 can be emitted in the secondary viewing angle area, and the light emitted by the first light source 200 can not be clearly visible within the main viewing angle range, Make the display effect of the backlight module as expected.
  • the range of the first included angle ⁇ 1 may be 20 degrees to 65 degrees, and the range of the second included angle ⁇ 1 may be 2 degrees to 15 degrees.
  • the first mesh dot 101 may also be a quadrangular pyramid structure.
  • the shape of the first side surface 101a may also be other shapes than rectangles.
  • the maximum width t0 of the first side surface 101 a in the longitudinal direction of the first dot 101 is defined as the width of the first side 101 a in the longitudinal direction of the first dot 101 .
  • t0 is in the range of 35 microns to 100 microns.
  • the maximum width b0 of the first side surface 101 a in the longitudinal direction perpendicular to the first screen dots 101 is defined as the width of the first side surface 101 a in the longitudinal direction perpendicular to the first screen dots 101 .
  • b0 is in the range of 20 microns to 100 microns.
  • the third included angle It is also possible to have a chamfer b1.
  • the chamfer b1 is a circular arc.
  • the radius of the arc is less than or equal to 30 microns, so that the display effect of the backlight module is better. Moreover, when the arc radius is smaller, the more accurate control of the viewing angle of the backlight module can be achieved. Therefore, preferably, the radius of the arc is less than or equal to 10 microns. Further preferably, the radius of the arc is less than or equal to 5 microns. Still further preferably, the radius of the arc is less than or equal to 3 microns.
  • the surface light source may be a collimated surface light source.
  • FIG. 5 is another schematic structural diagram of the backlight module shown in FIG. 1 in the X-Z plane.
  • the collimating surface light source 000a and the first light guide plate 100 are stacked in the thickness direction of the collimating surface light source 000a.
  • the form of the collimating surface light source 000a is not specifically limited in the present invention, as long as the light exit angle on the light exit surface of the collimating surface light source 000a is ensured to be narrow.
  • the angle between the output angle and the direction in which the emitted light intensity of the collimating surface light source 000a is the largest is not greater than 30 degrees; for example, As the angle changes, when the light intensity emitted by the collimating surface light source 000a drops to 5% of the maximum output light intensity, the angle between the output angle and the direction in which the emitted light intensity of the collimating surface light source 000a is the largest is not greater than 20 degrees; for example, with When the angle changes, when the light intensity emitted by the collimating surface light source 000a drops to 5% of the maximum output light intensity, the angle between the output angle and the direction in which the emitted light intensity of the collimating surface light source 000a is the largest is not greater than 15 degrees.
  • the present invention does not limit the maximum light intensity light output direction of the collimating surface light source 000a; the maximum light intensity light output direction of the collimating surface light source 000a can be defined as the angle between the direction of the maximum light intensity of the collimating surface light source 000a and the normal direction.
  • the direction of the maximum light intensity of the collimating surface light source 000a may be the same as the normal direction of the display surface; for example, there may be a certain angle between the direction of the maximum light intensity of the collimating surface light source 000a and the normal direction of the light output surface of the collimating surface light source 000a , for example, the included angle is within 5 degrees, within 10 degrees, or within 20 degrees.
  • FIG. 6 is an exploded view of another backlight module provided by the embodiment of the present application
  • FIG. 7 is the X-Z plane of the backlight module shown in FIG. 6 .
  • the collimating surface light source 000a includes a privacy protection structure 500 and a second light guide plate 300 stacked in the thickness direction; the second light guide plate 300 is located on the side of the privacy protection structure 500 away from the first light guide plate 100, and the second light guide plate 300
  • One side of the peep structure 500 has a plurality of second dots 301 .
  • the collimating surface light source 000a further includes a second light source 400.
  • the second light source 400 is located on the side of the second light guide plate 300.
  • the orthographic projection of the second light source 400 and the second light guide plate 300 on the plane where the light exit surface of the collimating surface light source 000a is located has no effect. overlap.
  • FIG. 8 is a light path diagram of the backlight module shown in FIG. 6 and FIG. 7 in the second privacy protection mode.
  • the collimating surface light source 000a When the collimating surface light source 000a is turned on and the first light source 200 is turned off, the collimating surface light source 000a can emit collimated light to make the backlight module in the second privacy mode.
  • FIG. 9 is a light path diagram of the backlight module shown in FIG. 6 and FIG. 7 in the second sharing mode.
  • the first light source 200 When the first light source 200 is turned on and the collimating surface light source 000a is turned on, the first light source 200 emits light. The light can be reflected by the plurality of first screen dots 101 and then emitted.
  • the collimated surface light source 000a can emit collimated light, so that the backlight module is in the second sharing mode.
  • FIG. 10 is an exploded view of another backlight module provided by the embodiment of the present application
  • FIG. 11 is the structure of the backlight module shown in FIG. 10 in the X-Z plane Schematic.
  • the collimating surface light source 000a may include: a privacy protection structure 500 and a second light guide plate 300 stacked in the thickness direction.
  • the second light guide plate 300 is located on a side of the privacy protection structure 500 away from the first light guide plate 100 , and a side of the second light guide plate 300 away from the privacy protection structure 500 has a plurality of second dots 301 .
  • the collimating surface light source 000 may further include: a second light source 400 .
  • the second light source 400 is located at the side of the second light guide plate 300 , and the orthographic projections of the second light source 400 and the second light guide plate 300 on the plane where the light exit surface of the collimating surface light source 000a is located do not overlap. In this way, the light emitted by the second light source 400 can be reflected by the plurality of second mesh points 301 to the privacy protection structure 500 , converted into collimated light by the privacy protection structure 500 , and emitted from the first light guide plate 100 .
  • the second light source 400 is a strip light source.
  • the second light source 400 may be an LED light bar.
  • the second light source 400 may include: arranging a plurality of LED light-emitting units 400a in a column or an array.
  • the strip light source means that the overall shape composed of all the LED light emitting units in the second light source 400 is a strip; for example, the second light source 400 may be composed of p ⁇ q LED light emitting units
  • the rectangular array has p columns and q rows of LED light-emitting units, where p ⁇ q; the second light source 400 can be designed such that p-columns of LED light-emitting units are distributed along the thickness direction of the first light guide plate 100, and q-row LED light-emitting units along the thickness direction of the first light guide plate 100.
  • the strip light source can also be a continuous light source, such as a surface light source or a line light source that emits uniform light.
  • the first light source 200 and the second light source 400 are identical.
  • the privacy protection structure 500 has multiple possible implementation manners, and the embodiment of the present application takes the following two possible implementation manners as examples for schematic illustration:
  • the privacy protection structure 500 includes: a grating structure (not shown in the figure), in this case, the second dots 301 can be circular dots, and the second dots 301 can be broken
  • the total reflection of the light emitted by the second light source 400 in the second light guide plate 300 causes the light emitted by the second light source 400 to be reflected to the grating structure by the second dots 301 .
  • the grating structure can block part of the light emitted from the second light guide plate 300 , convert the light emitted from the second light guide plate 300 into collimated light, reduce the viewing angle range of the backlight module, and realize the anti-peeping function.
  • the privacy protection structure 500 in the backlight module may include: a first substrate 501 , and a plurality of strip-shaped first substrates located on the first substrate 501 .
  • a prism 502 the plurality of first prisms 502 are located on the side of the first substrate 501 close to the second light guide plate 300, and the plurality of first prisms 502 can be closely arranged on the first substrate 501, and are closely arranged That is, there is no gap between any two adjacent first prisms 502 .
  • the length directions of the plurality of first prisms 502 are parallel to the extending direction (ie, the Y direction) of the light source bars of the second light source 400 , and the length directions of the plurality of first prisms 502 are perpendicular to the X-Z plane.
  • the plurality of first prisms 502 can be in the horizontal direction of the light-emitting surface (ie, the X-Y plane) of the backlight module, and perpendicular to the extending direction of the light source bars of the second light source 400 (ie, the X direction) , the light emitted by the second light guide plate 300 is narrowed, so that the backlight module can achieve the anti-peeping effect in the horizontal direction of the light-emitting surface of the backlight module.
  • the direction perpendicular to the extending direction of the light source bar of the second light source 400 and parallel to the light emitting surface of the backlight module can be defined as the horizontal direction of the light emitting surface of the backlight module (that is, X direction), and the direction parallel to the extension direction of the light source bar of the second light source 400 and parallel to the light emitting surface of the backlight module is defined as the vertical direction (ie, the Y direction) of the light emitting surface of the backlight module.
  • FIG. 12 is a light path diagram of the backlight module shown in FIG. 11 in the second privacy protection mode.
  • the second light source 400 When the second light source 400 is turned on and the first light source 200 is turned off, the light emitted by the second light source 400 It is reflected by the plurality of second mesh points 301 , and exits from the side of the second light guide plate 300 away from the plurality of second mesh points 301 , and enters the privacy protection structure 500 .
  • the first prism 501 in the privacy protection structure 500 can narrow the light emitted from the second light guide plate 300, so that the light emitted from the second light guide plate 300 can be concentrated in the main viewing angle area, thereby reducing the possibility of the backlight module.
  • the viewing angle range to realize the second privacy mode of the backlight module.
  • the material of the first substrate 501 is a light-transmitting material, which may specifically include a transparent polymer material.
  • the material of the first substrate 501 may be polyethylene terephthalate (English: Polyethylene terephthalate; PET for short), and the refractive index is between 1.62 and 1.65.
  • the thickness of the first substrate 100 is in the range of It may be 40 microns to 160 microns, for example, the thickness may be 50 microns, 75 microns, 100 microns, 125 microns or 150 microns, preferably 125 microns.
  • the material of the first prism 502 is a light-transmitting material, and may specifically include a transparent polymer material.
  • the material of the first prism 502 may be polycarbonate (English: Polycarbonate; PC for short), PET material or light curing material.
  • the thickness of the first prism 502 may range from 25 microns to 50 microns, for example, the thickness of the first prism 502 may preferably be 30 microns.
  • the first prism 502 can be manufactured by hot pressing, wherein the refractive index of the PC material is between 1.58 and 1.59; preferably, the first prism
  • the material of 502 is a photocurable material; when the material of the first prism 502 is a photocurable material, the first prism 502 can be irradiated with ultraviolet (English: Ultraviolet; referred to as: UV) light, cured and molded, and the molded light can be cured.
  • the cured material has scratch resistance to reduce the probability that the surface of the first prism 502 is scratched by other structures.
  • the refractive index of the photocurable material is between 1.5 and 1.57.
  • FIG. 13 is a partial enlarged view of the privacy protection structure in the backlight module shown in FIG. 11 .
  • the first prism 502 is a triangular prism structure, and the first prism 502 has a fourth side surface 502a in contact with the first substrate 501, and a fifth side surface 502b and a sixth side surface 502c connected with the fourth side surface 502a.
  • the fourth angle ⁇ between the fourth side 502a and the fifth side 502b is greater than or equal to the fifth angle ⁇ between the fourth side 502a and the fifth side 502c, and the fifth side in the first prism 502 502b is relatively close to the second light source 400 relative to the sixth side surface 502c.
  • the angle range of the fourth included angle ⁇ is 45 degrees to 90 degrees, or 50 degrees to 85 degrees, or 60 degrees to 72 degrees.
  • the angle of the fifth included angle ⁇ is 45 degrees to 70 degrees, or 50 degrees to 65 degrees, or 55 degrees to 60 degrees, or 53 degrees to 57 degrees.
  • the angle of the fourth included angle ⁇ may be one of 65.5 degrees, 69 degrees, 70 degrees, and 71 degrees, and the error range of the fourth included angle ⁇ is ⁇ 1 degree.
  • the angle of the fifth included angle ⁇ may be one of 54 degrees, 55 degrees, and 56 degrees, and the error range of the fifth included angle ⁇ is ⁇ 1 degree.
  • the degrees of the fourth included angle ⁇ and the fifth included angle ⁇ may be equal, which can reduce the process complexity and cost of fabricating the privacy protection structure 500 .
  • the degrees of the fourth included angle ⁇ and the fifth included angle ⁇ may both be in the range of 53 degrees to 57 degrees; for example, the degrees of the fourth included angle ⁇ and the fifth included angle ⁇ may both be 54 degrees or 55 degrees , or 56 degrees.
  • FIG. 14 is a partial enlarged view of the first prism in the privacy protection structure shown in FIG. 11 .
  • a chamfer exists at the sixth included angle ⁇ between the fifth side surface 502b and the sixth side surface 502c in the first prism 502 .
  • the chamfer a is a circular arc with a radius in the range of less than or equal to 30 microns.
  • the radius of the arc is in the range of less than or equal to 5 microns.
  • the radius of the arc is in the range of less than or equal to 3 microns.
  • the range of the radius of the arc is less than or equal to 1.5 microns.
  • the light emitted from the second light guide plate 300 can have a higher collimation degree after being refracted by the first prism 502, so that the light emitted from the second light guide plate 300 can be concentrated in the main viewing angle area and ensure the Anti-peep effect is better.
  • the privacy protection structure 500 may further include: a particle diffusion layer 503 , and the particle diffusion layer 503 may include: a transparent film layer and a plurality of particles located in the transparent film layer.
  • the particles are particles with scattering properties, and the light emitted from the first substrate 501 can be diffused by the scattering particles in the particle diffusion layer 503 .
  • the particle diffusion layer 503 can uniformize the light emitted from the first substrate 501, so as to improve the uniformity of the light emitted from the backlight module, thereby improving the display device including the backlight module. display effect.
  • the particles may include at least one of polymethyl methacrylate, polybutyl methyl acrylate, silicone, titanium dioxide, and barium sulfate.
  • the structure of the transparent film layer has a variety of possible implementation manners, and the following two possible implementation manners are used as examples for schematic illustration in the embodiments of the present application:
  • FIG. 15 is another schematic structural diagram of the backlight module shown in FIG. 10 in the X-Z plane provided by the embodiment of the present application, and the transparent film layer is the first Substrate 501.
  • FIG. 16 is another schematic structural diagram of the backlight module shown in FIG. 10 in the X-Z plane provided by the embodiment of the present application, and the transparent film layer is the first
  • the substrate 501 is away from the film layers on the side of the plurality of first prisms 502 .
  • the concentration of the particles in the transparent film layer ranges from 10% to 90%.
  • the concentration range refers to the ratio of the volume of the particles in the transparent film layer to the volume of the transparent film layer.
  • the shape of the first side surface 101a is a rectangle.
  • the width t of the first side surface 101a in the length direction (ie, the Y direction) of the first halftone dot 101, and the width t of the first side surface 101a in the length direction (ie, the X direction) perpendicular to the first halftone dot 101 The value range of b can determine the emission direction of the light emitted by the first light source 200 after passing through the first light guide plate 100 and the brightness of the light in each viewing angle area.
  • the widths t and b of the first side 101a may both be in the range of less than 10 micrometers or greater than 200 micrometers.
  • the widths t and b of the first side surface 101a are both less than 10 microns or greater than 200 microns, if the backlight module is in the second sharing mode, the light emitted by the backlight module is in the main viewing angle area and at the main viewing angle.
  • the two secondary viewing angle areas on both sides of the area (respectively: areas with an included angle of -45 degrees to -60 degrees with the normal direction of the light-emitting surface of the backlight module; areas with a normal direction of the light-emitting surface of the backlight module) Brightness peaks may exist in the area with an included angle of 45 degrees to 60 degrees).
  • the width t of the first side surface 101a may range from 55 micrometers to 200 micrometers
  • the width b of the seventh side surface 101a may range from 65 micrometers to 200 micrometers.
  • the width t of the first side surface 101a is in the range of 55 ⁇ m to 200 ⁇ m
  • the width b of the first side surface 101a is in the range of 65 ⁇ m to 200 ⁇ m
  • the backlight module emits Brightness peaks can exist both in the main viewing angle area and the secondary viewing angle area on one side of the main viewing angle area (the area with an angle of -45 degrees to -60 degrees with the normal direction of the light-emitting surface of the backlight module).
  • the width t of the first side surface 101a may be selected in the range of 10 micrometers to 55 micrometers, and the width b of the first side surface 101a may be selected in the range of 25 micrometers to 65 micrometers.
  • the width t of the first side surface 101a is selected in the range of 10 ⁇ m to 55 ⁇ m, and the width b of the first side surface 101a is selected in the range of 25 ⁇ m to 65 ⁇ m, if the backlight module is in the second sharing mode, the backlight module is in the second sharing mode.
  • the light emitted by the group can exist in both the main viewing angle area and the secondary viewing angle area located on one side of the main viewing angle area (the area with an included angle of -45 degrees to -60 degrees with the normal direction of the light-emitting surface of the backlight module)
  • the brightness peak, and compared with the second case, the brightness of the light in the sub viewing angle area is higher.
  • both the first light source 200 and the second light source 400 are bar light sources, and the extending direction of the light source bar of the second light source 400 is the same as the extending direction of the light source bar of the first light source 200 .
  • the second dot 301 is a triangular prism, and the length direction of the second dot 301 is parallel to the extending direction of the light source bar of the second light source 400 , that is, as shown in FIG. 11 , the length direction of the second dot 301 is parallel to the X-Z plane. vertical.
  • the second dots 301 are used to break the total reflection of the light emitted by the second light source 400 in the second light guide plate 300 .
  • the backlight module when used in a CDD display system in a vehicle-mounted display system, the backlight module implements a shared mode in the horizontal direction of the display surface of the CDD display system to improve light utilization.
  • the light-emitting surface of the backlight module is parallel to the display surface of the CDD display system and parallel to the X-Y plane, and the horizontal direction between the light-emitting surface of the backlight module and the display surface of the CDD display system is the X direction.
  • FIG. 17 is a light path diagram of the backlight module shown in FIG. 11 in the second sharing mode, when the first light source 200 is turned on Afterwards, the light emitted by the first light source 200 is reflected by the plurality of first screen dots 101 , and is emitted from the side of the first light guide plate 100 away from the plurality of first screen dots 101 .
  • the light emitted by the first light source 200 is concentrated in the sub-viewing angle area with an included angle of -45 degrees to -60 degrees with the normal direction of the light-emitting surface of the backlight module, and the sub-viewing angle area on the other side of the main viewing angle area There is as little light as possible inside.
  • the backlight module is integrated into the CDD display system in the vehicle display system, since the driver is usually located on the side of the co-pilot, the co-pilot watches the picture in the main viewing angle area, and the driver is on the side of the main viewing angle area. the sub-viewing angle area to view the screen.
  • the output of the backlight module can be effectively improved. utilization of light.
  • the second light source 400 is turned on, the light emitted by the second light source 400 is concentrated in the main viewing angle area.
  • the backlight module can be in the second sharing mode. And for the light emitted by the backlight module, there are brightness peaks in the main viewing angle area and the sub viewing angle area located on one side of the main viewing angle area, but there is no brightness peak in the sub viewing angle area located on the other side of the main viewing angle area.
  • the brightness of the light emitted by the backlight module in the secondary viewing angle area can reach more than 70% of the brightness in the main viewing angle area, which improves the brightness of the display device including the backlight module in the secondary viewing angle area, thereby improving the second viewing angle.
  • the sharing mode the display effect of the display device is displayed.
  • FIG. 18 is a schematic diagram of the light beam distribution of the backlight module shown in FIG. 11 in the second privacy protection mode.
  • the origin O is any point on the light-emitting surface of the backlight module, usually the center point of the backlight module.
  • Each semi-circle with the origin O as the center represents: each different brightness, the unit is: candela per square meter.
  • Each straight line passing through the origin O represents: the angle between each different observation direction and the normal line of the light-emitting surface of the backlight module, wherein, when the angle is 0 degrees, it means that the observation direction is perpendicular to the light output of the backlight module
  • the angle of the included angle is a negative number, it means that the observation direction is located on one side (for example, the left side) of the normal line of the light-emitting surface of the backlight module; when the angle of the included angle is a positive number, it means that the observation direction is located in the backlight module The other side (eg, the right side) of the normal to the emitting surface of the group.
  • the backlight module When the backlight module is in the second privacy protection mode, the light emitted by the second light source 400 is reflected by the plurality of second screen dots 301, and exits from the side of the second light guide plate 300 away from the plurality of second screen dots 301, and enters the Peek at structure 500.
  • the first prism 501 in the privacy protection structure 500 can narrow the light emitted from the second light guide plate 300 so that the light emitted from the second light guide plate 300 is concentrated in the central area A of the light emitting surface of the backlight module.
  • FIG. 19 is a schematic diagram of the beam distribution of the backlight module shown in FIG. 11 in the second sharing mode.
  • the meanings of the lines shown in FIG. 19 may refer to FIG. 18 , which will not be repeated here.
  • the backlight module is in the second sharing mode, the light emitted by the first light source 200 is reflected by the plurality of first screen dots 101 and exits from the side of the first light guide plate 100 away from the plurality of first screen dots 101 .
  • the light emitted by the first light source 200 is concentrated in a region B whose included angle with the normal direction of the light-emitting surface of the backlight module is -45 degrees to -60 degrees.
  • the thick solid line in FIG. 19 represents the brightness distribution of the light beam in the horizontal direction on the light-emitting surface of the backlight module; the thin solid line represents the brightness distribution of the light beam on the light-emitting surface of the backlight module in the vertical direction. .
  • FIG. 20 is a front view of the second dot 301 in the backlight module shown in FIG. 11 in the XZ plane;
  • FIG. 21 is the second dot shown in FIG. 11 .
  • the second dot 301 is a triangular prism structure, the second dot 301 has a seventh side 301a contacting the second light guide plate 300, an eighth side 301b and a ninth side 301c connected to the seventh side 301a, and the seventh side 301a is connected to the seventh side 301a.
  • the shape of the seventh side surface 301a is a rectangle.
  • the width v of the seventh side surface 301a in the length direction (that is, the Y direction) of the second screen dots 301 is in the range of 35 microns to 100 microns, and the length of the seventh side face 301a is perpendicular to the length of the second screen dots 301.
  • the width c in the direction (ie, the X direction) is in the range of 20 micrometers to 100 micrometers.
  • the width of the seventh side surface 301 a in the length direction (ie, the Y direction) of the second screen dots 301 is in the range of 10 ⁇ m to 55 ⁇ m, and the seventh side surface 301 a is perpendicular to the length direction of the second screen dots 301 .
  • the width (ie, the X direction) ranges from 40 microns to 55 microns.
  • the width of the seventh side surface 301 a in the length direction of the second screen dots 301 may be one of 35 microns, 45 microns, 50 microns, and 55 microns, and the seventh side surface 301 a is in the length direction of the second screen dots 301 .
  • the error range of the width is ⁇ 0.01 ⁇ m
  • the width of the seventh side surface 301a in the length direction perpendicular to the second dot 301 may be one of 45 ⁇ m, 45.5 ⁇ m, 50 ⁇ m, 51.7 ⁇ m, 53.5 ⁇ m, and 55 ⁇ m
  • the error range of the width of the seventh side surface 301 a in the longitudinal direction perpendicular to the second dot 301 is ⁇ 0.02 ⁇ m.
  • the eighth angle ⁇ 2 is greater than the seventh angle ⁇ 2 , and the eighth side surface 301 b of the second dot 301 is closer to the second light source 400 than the ninth side surface 301 c .
  • the control accuracy of the light emitted from the second light source 400 by the second mesh point 301 can be ensured, thereby ensuring the privacy protection effect of the backlight module.
  • the angle range of the eighth included angle ⁇ 2 may be 10 degrees to 90 degrees, or 15 degrees to 60 degrees, or 30 degrees to 60 degrees, or 40 degrees to 60 degrees, or 55 degrees to 60 degrees, or 20 degrees to 45 degrees, or 25 degrees to 35 degrees, or 26 degrees to 30 degrees; the angle range of the fifth included angle ⁇ can be 1 degree to 30 degrees, or 1 degree to 20 degrees, or 1.5 degrees to 5 degrees, Or 1.5 degrees to 4 degrees, or 1.5 degrees to 3 degrees.
  • the angle of the eighth included angle ⁇ 2 may be one of 26.5 degrees, 27.5 degrees, 28.5 degrees, and 29.5 degrees, and the error range of the eighth included angle ⁇ 2 is ⁇ 0.5 degrees. In this case, it can be ensured that when the backlight module is in the privacy protection mode and the sharing mode, the brightness of the backlight module in the main viewing angle area and the secondary viewing angle area are both high.
  • FIG. 22 is the light path diagram of the second light guide plate when the angle of the seventh included angle ⁇ 2 is 20 degrees
  • FIG. 23 is the corresponding light path diagram when the angle of the seventh included angle ⁇ 2 is less than or equal to 5 degrees
  • the light path diagram of the second light guide plate Under the condition that the size of the second light guide plate 300 and the light emitted by the second light source 400 are the same, when the angle of the fifth included angle ⁇ is 20 degrees, one second dot 301 will break the second light source 400 in a larger range.
  • Total reflection of the second light guide plate 300 that is, the smaller the seventh angle ⁇ 2 is, the higher the control precision of the second dot 301 on the light emitted by the second light source 400 is.
  • the angle of the seventh included angle ⁇ 2 is within a range of less than or equal to 3.5 degrees. Considering the difficulty of the manufacturing process, the angle of the seventh included angle ⁇ 2 is in the range of 1.5 degrees to 3.5 degrees.
  • the seventh included angle ⁇ 2 may be one of 1.5 degrees, 2 degrees, 2.5 degrees, 3 degrees, and 3.5 degrees, and the error range of the fifth included angle ⁇ is ⁇ 0.5 degrees.
  • the second network point 301 can control the light emitted by the second light source 400 with high precision, which can ensure the privacy protection effect of the backlight module.
  • the ninth included angle between the eighth side surface 301b and the eighth side surface 301c in the second dot 301 There is a chamfer b2 there.
  • the chamfer b2 is a circular arc.
  • the radius of the arc needs to be less than or equal to 30 microns.
  • the radius of the arc is not greater than 10 microns, it can be ensured that the backlight module is in the shared mode, and the brightness of the light in the main viewing angle area and the secondary viewing angle area is relatively high; further preferably, the radius of the arc is smaller than or It is equal to 5 microns. In this way, it can be ensured that when the backlight module is in the privacy protection mode and the sharing mode, the light brightness in the main viewing angle area and the sub viewing angle area are both high. Still further preferably, the radius of the arc may be less than or equal to 3 microns. In this way, when the backlight module is in the privacy protection mode and the sharing mode, the light brightness in the main viewing angle area and the secondary viewing angle area can be further improved.
  • the second dots 301 may also have a quadrangular pyramid structure.
  • the shape of the seventh side surface 301a may also be other shapes than rectangles.
  • the maximum width v0 of the seventh side surface 301 a in the longitudinal direction of the second halftone dot 301 is defined as the width of the seventh side surface 301a in the lengthwise direction of the second halftone dot 301 .
  • v0 ranges from 35 microns to 100 microns.
  • the maximum width c0 of the seventh side surface 301 a in the longitudinal direction perpendicular to the second screen dots 301 is defined as the width of the seventh side surface 301 a in the longitudinal direction perpendicular to the second screen dots 301 .
  • c0 is in the range of 20 microns to 100 microns.
  • the shape and size of the first screen dot 101 and the second screen dot 301 may be the same, that is, the size and angle of the first screen dot 101 and the second screen dot 301 may be the same.
  • the orientations of the first network point 101 and the second network point 301 may be the same or opposite.
  • the density of the first dots 101 at any position in the first light guide plate 100 is positively correlated with the distance between the first light source 200 and any position, that is, the first light guide plate 100
  • the density of the dots 101 tends to increase as the distance between the arbitrary position and the first light source 200 increases.
  • the density of the second dots 301 at any position in the second light guide plate 300 is positively correlated with the distance between the second light source 400 and any position. In this way, the uniform transmission of light in the first light guide plate 100 and the second light guide plate 300 can be ensured, and the uniformity of the brightness of the backlight module is improved.
  • the materials of the first light guide plate 100 and the second light guide plate 300 may include: polymethyl methacrylate (English: Polymethyl methacrylate; PMMA for short), PC material, PET material or photocurable material, and the refractive index may be Choose from a range of 1.3 to 1.65.
  • the first light guide plate 100 and the second light guide plate 300 include PC material, and the refractive index of the PC material is between 1.58 and 1.59.
  • the first dots 101 and the second dots 301 can be manufactured by an injection molding process or a hot pressing process.
  • the thicknesses of the first light guide plate 100 and the second light guide plate 300 may be determined according to the size of the display device including the backlight module.
  • the thicknesses of the first light guide plate 100 and the second light guide plate 300 are both in the range of 300 ⁇ m to 500 ⁇ m.
  • the thicknesses of the two light guide plates 300 can both be 400 microns or 500 microns.
  • the thicknesses of the first light guide plate 100 and the second light guide plate 300 are both in the range of 1800 ⁇ m to 2100 ⁇ m.
  • the thicknesses of the two light guide plates 300 can both be 2000 microns.
  • first light guide plate 100 and the second light guide plate 300 may be the same or different.
  • the first combination of the first dots 101 and the first light guide plate 100 may be exactly the same as the second combination of the second dots 301 and the second light guide plate 300 , so that the first combination
  • the composite body and the second assembly can be manufactured through one development process, which saves the development cost and reduces the complexity of the process.
  • the collimating surface light source 000 may further include: a reflection sheet 600 located on the side of the second light guide plate 400 away from the privacy protection structure 500 .
  • FIG. 24 is a light path diagram of the reflection sheet in the backlight module shown in FIG. 11 .
  • the reflective sheet 600 can be used to re-reflect the light transmitted from the second screen dots 301 back to the second light guide plate 300, thereby improving the utilization rate of the light and improving the brightness of the light emitted by the backlight module in the privacy protection mode.
  • the reflection sheet 600 is a specular reflection sheet.
  • the reflection sheet 600 may be a silver reflection sheet or an enhancer specular reflection sheet (English: Enhanced Specular Reflector; abbreviation: ESR).
  • ESR Enhanced Specular Reflector
  • the reflective sheet 600 can reflect the light transmitted from the first screen dots 101 back to the second light guide plate 300 in the form of specular reflection, so as to avoid scattering of the light emitted by the second light source 400 and ensure the privacy protection effect of the backlight module. .
  • the collimating surface light source 000 may further include: a prism layer 700 located between the second light guide plate 300 and the reflection sheet 600 .
  • the prism layer 700 may include: a second substrate 701, and a plurality of strip-shaped second prisms 702 on the second substrate 701, where the second prisms 702 are located on the second substrate 701 close to the second light guide plate 300 One side, and the length direction of the plurality of second prisms 702 is perpendicular to the extending direction of the light source bar of the second light source 300 .
  • the length direction of the second prisms 702 is parallel to the X-Z plane, and the plurality of second prisms 702 are closely arranged on the second substrate 702, that is, there is no gap between any two adjacent second prisms 702. There are gaps. In this way, the second prism 702 can narrow the light beam in the vertical direction of the light-emitting surface of the backlight module, so as to improve the overall brightness of the backlight module.
  • the side of the second substrate 701 away from the second prism 702 may be a reflective surface.
  • the side of the second substrate 701 away from the second prism 702 may be coated with a reflective material. In this way, the reflective sheet 600 does not need to be arranged in the backlight module, which simplifies the film layer structure of the backlight module.
  • the second prism 702 has a tenth side surface in contact with the second substrate 701, and an eleventh side surface and a twelfth side surface connected with the tenth side surface.
  • the angle of the tenth included angle between the tenth side face and the eleventh side face is equal to the angle of the eleventh included angle between the tenth side face and the twelfth side face, and the eleventh side face and the twelfth side face
  • the angle of the twelfth included angle between them is 90 degrees, that is, the cross section of the second prism 702 in the Y-Z plane is an isosceles right triangle.
  • FIG. 25 is a light path diagram in the Y-Z plane of a backlight module provided by an embodiment of the present application that does not include a prism layer
  • FIG. 26 is the backlight module shown in FIG. 11 .
  • Optical path diagram in the Y-Z plane Compared with FIG. 25 , the light beam in the vertical direction of the light-emitting surface of the backlight module shown in FIG. 26 is narrowed, and the peak brightness is significantly increased, and the overall brightness of the backlight module can be increased by 20% to 30%.
  • FIG. 27 is a schematic diagram of a light beam distribution in a vertical direction of a light-emitting surface of a backlight module provided by an embodiment of the present application. Except for the meaning represented by the thickness of the line, the meaning of FIG. 27 can be referred to FIG. 18 , which will not be repeated here.
  • the thick solid line represents the beam distribution in the vertical direction of the light-emitting surface of the backlight module without the second prism 702
  • the thin dotted line represents the vertical direction of the light-emitting surface of the backlight module including the second prism 702. beam distribution in the straight direction. It can be seen from FIG. 27 that for the backlight module including the second prism 702, the light beam in the vertical direction of the light-emitting surface of the backlight module is narrowed, and the brightness is improved.
  • FIG. 28 is a schematic structural diagram of another backlight module in the Y-Z plane provided by the embodiment of the present application.
  • the side of the first light guide plate 100 away from the plurality of first mesh points 101 may have a plurality of strip-shaped third prisms 102
  • the side of the second light guide plate 300 away from the plurality of second mesh points 301 may have a plurality of strip-shaped fourth prisms 302
  • the length directions of the plurality of third prisms 102 and the length directions of the plurality of fourth prisms 302 are both parallel to the length direction of the second prisms 702 .
  • the plurality of third prisms 102 may be closely arranged on the first light guide plate 100 , which means that there is no gap between any two adjacent third prisms 102 .
  • the plurality of fourth prisms 302 may be closely arranged on the first light guide plate 300 , and the dense arrangement means that there is no gap between any two adjacent fourth prisms 302 .
  • the shapes and structures of the third prism 102 and the fourth prism 302 have various possible implementation directions.
  • the embodiments of the present application take the following two possible implementation manners as examples for schematic illustration:
  • the shapes and structures of the third prism 102 and the fourth prism 302 are the same as those of the second prism 702 , which will not be repeated here.
  • the cross-sections of the third prism 102 and the fourth prism 302 in the Y-Z plane are both arcuate.
  • the shapes of the cross sections of the third prism 102 and the fourth prism 302 may also be trapezoids.
  • the embodiments of the present application are not limited herein.
  • the third prism 102 and the fourth prism 302 can also narrow the light beam in the vertical direction of the light-emitting surface of the backlight module, thereby further improving the overall brightness of the backlight module.
  • the backlight module only needs to ensure that it has at least one of the third prism 102 on the first light guide plate 100 , the fourth prism 302 on the second light guide plate 200 and the prism layer 700 , so that the backlight can be The light beam in the vertical direction of the light-emitting surface of the module is narrowed.
  • FIG. 29 is a schematic structural diagram of another backlight module provided by an embodiment of the present application.
  • the backlight module may further include: a frame body 800 .
  • the first light guide plate 100 , the second light guide plate 300 , the anti-peep structure 500 , the first light source 200 and the second light source 400 in the backlight module are all located in the frame body 800 .
  • the frame body 800 may include: a back plate 801 , the back plate 801 has a first groove 801 a , a second groove 801 b and a third groove 801 c connected in sequence, the first groove 801
  • the opening surface of the groove 801a is coplanar with the bottom surface of the second groove 801b
  • the opening surface of the second groove 801b is coplanar with the bottom surface of the third groove 801c.
  • the reflective sheet 600 is located in the first groove 801a, the second light guide plate 300 and the second light source 400 are located in the second groove 801b, and the first light guide plate 100 and the first light source 200 are located in the third groove 801c , and the privacy protection structure 200 is also located in the second groove 801b.
  • the backplane 801 can effectively support each film layer structure in the backlight module.
  • the reflective sheet 600 is located in the first groove 801a
  • the second light guide plate 300 and the second light source 400 are located in the second groove 801b
  • the first light guide plate 100 and the first light source 200 are located in the third groove 801c
  • a certain distance between the first light guide plate 100 and the reflective sheet 600 and/or a certain distance between the second light guide plate 300 and the privacy protection structure 500 can be selectively set to avoid the
  • the surface of the first dot 101 and the reflective sheet 600 and/or the second dot 301 in the second light guide plate 300 and the surface of the anti-peep structure 500 are damaged due to the interaction of force, which affects the display device including the backlight module. display effect.
  • the distance between the first light guide plate 100 and the reflective sheet 600 and the distance between the second light guide plate 300 and the privacy protection structure 500 are positively correlated with the attenuation of the overall brightness of the backlight module, Therefore, the distance between the first light guide plate 100 and the reflective sheet 600 and the distance between the second light guide plate 300 and the privacy protection structure 500 should not be too large to ensure that the overall brightness of the backlight module is high.
  • the distance between the first light guide plate 100 and the reflection sheet 600 and the distance between the second light guide plate 300 and the privacy protection structure 500 may both be within a range of not less than 0.1 mm and not more than 0.5 mm.
  • a ring-shaped support structure may be arranged between the privacy-preventing structure 500 and the second light guide plate 300 , so that there is a certain distance between the privacy-preventing structure 500 and the second light-guiding plate 300 to avoid the privacy-preventing structure 500
  • the first prism 502 and the surface of the second light guide plate 300 exert force on each other to cause damage. This distance may range from 0.1 mm to 0.5 mm.
  • the frame body 800 may further include: a plastic frame 802 connected to the edge of the back plate 801 , the plastic frame 802 has a panel bearing part 802a, and the panel bearing part 802a is used to carry the display panel.
  • the first light source 200 and the second light source 400 are located on the same side of the frame body 800 . In this way, the width of the frame of the backlight module can be reduced.
  • FIG. 30 is a schematic structural diagram of still another backlight module provided by an embodiment of the present application.
  • the first light source 200 and the second light source 400 are respectively located on opposite sides of the frame body 800 . In this way, it is beneficial for the backlight module to dissipate heat during the working process.
  • the backlight module provided by the embodiments of the present application includes: a collimating surface light source, a first light guide plate and a first light source.
  • the first light guide plate is located on the light-emitting side of the collimating surface light source, so the light emitted by the first light source can be emitted from the backlight module only after being reflected by the first screen point without passing through other films.
  • Floor the loss of the light emitted by the first light source during the propagation process is reduced, the brightness of the light in the secondary viewing angle area when the backlight module is in the shared mode is improved, and the display device including the backlight module is improved in In the sharing mode, the brightness of the display screen improves the display effect of the display device.
  • Embodiments of the present application further provide a display device, and the display device may include a display panel and the above-mentioned backlight module.
  • FIG. 31 is a schematic structural diagram of a display device provided by an embodiment of the present application.
  • the display device includes any one of the above-mentioned backlight modules and a display panel 001, and the display panel 001 is located on the panel bearing portion 802a in the backlight module.
  • the display panel 001 can be connected to the backlight module through the foam 002 .
  • the display panel 001 is a liquid crystal display panel, and the display panel 001 may include: an array substrate and a color filter substrate disposed opposite to each other, a first polarizer located on a side of the array substrate away from the color filter substrate, and a first polarizer located on a side of the array substrate away from the array substrate. side of the second polarizer.
  • the display device can be any product or component with display function, such as liquid crystal panel, electronic paper, mobile phone, tablet computer, TV, monitor, notebook computer, digital photo frame, navigator and CDD display system in vehicle display system.
  • display function such as liquid crystal panel, electronic paper, mobile phone, tablet computer, TV, monitor, notebook computer, digital photo frame, navigator and CDD display system in vehicle display system.
  • the application scenario of the display device is not limited to the CDD display system in the vehicle display system.
  • range in the above-mentioned embodiments shall include the endpoint values.
  • range 45 degrees to 90 degrees includes an end value of 45 degrees and an end value of 90 degrees.

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Abstract

一种背光模组及显示装置，背光模组包括：面光源（000）、第一导光板（100）和第一光源（200），第一导光板（100）位于面光源（000）的出光侧，第一光源（200）发出的光线经过第一网点（101）反射后即可从背光模组中出射，无需经过其他膜层，从而降低了第一光源（200）发出的光线在传播过程中的损失，提高了背光模组在共享模式时副视角区域内的光线亮度，提高了显示装置中显示画面的亮度。

Description

背光模组及显示装置 技术领域
本申请涉及显示技术领域，特别涉及一种背光模组及显示装置。
背景技术
随着显示技术的发展，在不同的场合下，显示装置需具有不同的视角。例如，当多人需要在不同角度均看见显示装置的显示画面时，显示装置的视角范围需较大，以使显示装置处于共享模式；当需要对显示画面内容保密，仅对使用者自身可见时，显示装置的视角范围需较小，以使显示装置处于防窥模式。
在相关技术中，当显示装置处于共享模式时，通常人眼观察方向与显示装置的显示面显示装置的显示面的法线之间的夹角较小时，所观察到的显示画面的亮度较高，而人眼观察方向与显示装置的显示面的法线之间的夹角较大时，所观察到的显示画面的亮度较低。如此，显示装置在处于共享模式时，该显示装置的显示效果较差。
发明内容
本申请实施例提供了一种背光模组及显示装置。可以解决现有技术中的显示装置在处于共享模式时，该显示装置的显示效果较差的问题，所述技术方案如下：
一方面，提供了一种背光模组，所述背光模组包括：
面光源；
与所述面光源在厚度方向上层叠设置的第一导光板，所述第一导光板位于所述面光源出光侧，所述第一导光板靠近所述面光源的一面具有多个第一网点；
以及，第一光源，所述第一光源位于所述第一导光板的侧面，所述第一光源与所述第一导光板在所述面光源的出光面所在平面上的正投影无交叠。
可选的，所述第一光源为条状光源；
所述第一网点为棱镜结构，所述第一网点的长度方向与所述第一光源的光源条延伸方向平行；
所述第一网点为三棱镜结构，所述第一网点具有与所述第一导光板接触的第一侧面，以及与所述第一侧面连接的第二侧面和第三侧面，所述第一侧面与所述第二侧面之间具有第一夹角，所述第一侧面与所述第三侧面之间具有第二夹角，所述第二侧面和第三侧面之间具有第三夹角。
可选的，所述第一侧面在所述第一网点的长度方向上的宽度的范围为35微米至100微米，所述第一侧面在垂直于所述第一网点的长度方向上的宽度的范围为20微米至100微米。
可选的，所述第一夹角的取值范围为20度至70度，所述第二夹角小于或等于20度。
可选的，所述第三夹角处存在倒角，所述倒角为圆弧，所述圆弧的半径小于或等于30微米。
可选的，所述面光源为准直面光源。
可选的，所述准直面光源包括在厚度方向上层叠设置的防窥结构和第二导光板；
所述第二导光板位于所述防窥结构远离所述第一导光板的一侧，所述第二导光板远离所述防窥结构的一面具有多个第二网点；
所述准直面光源还包括第二光源，所述第二光源位于所述第二导光板的侧面，所述第二光源与所述第二导光板在所述准直面光源的出光面所在平面上的正投影无交叠。
可选的，所述防窥结构包括：第一衬底，以及位于所述第一衬底上的多个条状的第一棱镜，所述多个第一棱镜位于所述第一衬底靠近所述第二导光板的一侧。
可选的，所述第二光源为条状光源，所述第二光源的光源条延伸方向与所述第一光源的光源条延伸方向相同；
所述多个第一棱镜的长度方向与所述第二光源的光源条延伸方向平行。
可选的，所述第一棱镜为三棱镜结构，所述第一棱镜具有与所述第一衬底接触的第四侧面，以及与所述第四侧面连接的第五侧面和第六侧面；
所述第四侧面与所述第五侧面之间的第四夹角，大于或等于所述第四侧面与所述第六侧面之间的第五夹角，且所述第一棱镜中所述第四侧面相对于所述第五侧面靠近所述第二光源。
可选的，所述第四夹角的角度范围为45度至90度，所述第五夹角的角度为45度至70度。
可选的，所述第四夹角的角度范围为60度至72度，所述第四夹角的角度范围为53度至57度。
可选的，所述第五侧面与第六侧面之间的第六夹角处存在倒角，所述倒角为圆弧，所述圆弧的半径小于或等于30微米。
可选的，所述防窥结构还包括：粒子扩散层，所述粒子扩散层包括：透明膜层以及位于所述透明膜层内的多个粒子；
其中，所述透明膜层为所述第一衬底，或者，所述透明膜层为所述第一衬底远离所述多个第一棱镜一侧的膜层。
可选的，所述透明膜层内的粒子的浓度范围为10％至90％。
可选的，所述第二网点为三棱镜结构，所述第二网点的长度方向与所述第二光源的光源条延伸方向平行；
所述第二网点具有与所述第二导光板接触的第七侧面，以及与所述第七侧面连接的第八侧面和第九侧面；
所述第七侧面与所述第八侧面之间具有第七夹角，所述第七侧面与所述第九侧面之间的第八夹角，所述第八侧面与第九侧面之间具有第九夹角。
可选的，所述第四侧面在所述第二网点的长度方向上的宽度的范围为35微米至100微米，所述第四侧面在垂直于所述第二网点的长度方向上的宽度的范围为20微米至100微米。
可选的，所述第七夹角大于所述第八夹角，且所述第二网点中的所述第八侧面相对于所述第九侧面靠近所述第二光源。
可选的，所述第七夹角的角度范围为10度至90度，所述第八夹角小于或等于30度。
可选的，所述第七夹角的角度为26度至30度，所述第八夹角小于或等于5度。
可选的，所述第八侧面与所述第九侧面之间的第九夹角处存在倒角，所述倒角为圆弧，所述圆弧的半径小于或等于30微米。
可选的，所述圆弧的半径小于或等于5微米。
可选的，所述第一网点与所述第二网点的形状和大小均相同。
可选的，所述防窥结构包括：光栅结构。
可选的，所述准直面光源还包括：位于所述第二导光板远离所述防窥结构一侧的反射片。
可选的，所述准直面光源还包括：位于所述第二导光板和所述反射片之间的第二衬底，以及位于所述第二衬底上的多个条状的第二棱镜，所述第二棱镜位于所述第二衬底靠近所述第二导光板的一侧，且所述多个第二棱镜的长度方向与所述第二光源的光源条延伸方向垂直。
可选的，所述第一导光板远离所述多个第一网点的一面具有多个条状的第三棱镜，和/或，所述第二导光板远离所述多个第二网点的一面具有多个条状的第四棱镜，所述多个第三棱镜的长度方向和所述多个第四棱镜的长度方向均与所述第二光源的光源条延伸方向垂直。
可选的，所述背光模组还包括：框体；所述第一导光板、所述第二导光板、所述防窥结构、所述第一光源以及所述第二光源均位于所述框体内。
可选的，所述框体包括：背板，所述背板具有依次连通的第一凹槽、第二凹槽和第三凹槽，所述第一凹槽的开口面与所述第二凹槽的底面共面，所述第二凹槽的开口面与所述第三凹槽的底面共面；
其中，所述反射片位于所述第一凹槽内，所述第二导光板和所述第二光源均位于所述第二凹槽内，所述第一导光板和所述第一光源均位于所述第三凹槽内。
可选的，所述框体还包括：与所述背板边缘连接的胶框，所述胶框具有面板承载部，所述面板承载部用于承载显示面板。
可选的，所述第一光源和所述第二光源位于所述框体的同一侧，或者，所述第一光源和所述第二光源分别位于所述框体相对的两侧。
另一方面，提供了一种显示装置，所述显示装置包括：
显示面板，以及上述背光模组。
本申请实施例提供的技术方案带来的有益效果至少包括：
该背光模组包括：
面光源、第一导光板和第一光源。由于在该背光模组中，第一导光板位于面光源的出光侧，因此第一光源发出的光线仅经过第一网点反射后，即可从背光模组中出射，而无需再经过其他膜层。如此，降低了第一光源发出的光线在传播过程中的损失，提高了该背光模组在共享模式时，副视角区域内的光线亮度，进而 提高了包含有该背光模组的显示装置在处于共享模式时，显示画面的亮度，提高了显示装置的显示效果。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请实施例提供的一种背光模组的爆炸图；
图2是图1示出的背光模组在X-Z平面的结构示意图；
图3是图2示出的背光模组中的第一网点在X-Z平面的主视图；
图4是图2示出的第一网点在X-Y平面的俯视图；
图5是另一种图1示出的背光模组在X-Z平面的结构示意图；
图6是本申请实施例提供的另一种背光模组的爆炸图；
图7是图6示出的背光模组在X-Z平面的结构示意图；
图8是图6和图7示出的背光模组处于第二防窥模式的光路图；
图9是图6和图7示出的背光模组处于第二共享模式的光路图；
图10是本申请实施例提供的又一种背光模组的爆炸图；
图11是图10示出的背光模组在X-Z平面的结构示意图；
图12是图11示出的背光模组处于第二防窥模式的光路图；
图13是图11示出的背光模组中的防窥结构的局部放大图；
图14是图11示出的防窥结构中的第一棱镜的局部放大图；
图15是本申请实施例提供的另一种图10示出的背光模组在X-Z平面的结构示意图；
图16是本申请实施例提供的又一种图10示出的背光模组在X-Z平面的结构示意图；
图17是图11示出的背光模组处于第二共享模式的光路图；
图18是图11示出的背光模组处于第二防窥模式的光束分布示意图；
图19是图11示出的背光模组处于第二共享模式光束分布示意图；
图20是图11示出的背光模组中的第二网点在X-Z平面的主视图；
图21是图11示出的第二网点在X-Y平面的俯视图；
图22是第七夹角θ2的角度为20度时第二导光板的光路图；
图23是第七夹角θ2的角度在小于或等于5度范围内时对应第二导光板的光路图；
图24是图11示出的背光模组中反射片的光路图；
图25是本申请实施例提供的一种不包含有棱镜层的背光模组的在Y-Z平面的视角示意图；
图26是图11示出的背光模组在Y-Z平面的光路图；
图27是本申请实施例提供的一种背光模组在背光模组的出光面的竖直方向上的光束分布示意图；
图28是本申请实施例提供的另一种背光模组在Y-Z平面的结构示意图；
图29是本申请实施例提供的又一种背光模组的结构示意图；
图30是本申请实施例提供的再一种背光模组的结构示意图；
图31是本申请实施例提供的一种显示装置的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
目前的车载显示产品中，主要包括位于驾驶员前方的仪表盘显示系统(英文：Instrument Cluster Display；简称：ICD)、中控显示系统(英文：Central Information Display；简称：CID)，以及位于副驾驶前方的显示系统(英文：Co-driver Display；简称：CDD)。其中，ICD显示系统和CID显示系统主要用于驾驶员的操作和观看，CDD显示系统可以显示包含娱乐信息的画面和包含导航信息的画面。
在一种有需求的使用场景中，例如副驾驶协助驾驶员导航时，需要CCD显示系统显示的信息有较宽视角，以便车内人员都可以看到显示画面，定义这种显示模式为第一共享模式。
在另一种有需要的使用场景中，例如不希望驾驶员导航画面打扰副驾驶时，需要CCD显示系统显示的信息仅在驾驶员视角方向显示，而在其他视角方向不明显可见，定义这种显示模式为第一防窥模式。
在又一种有需要的使用场景中，例如当CDD显示系统显示影像包含娱乐信 息的画面时，为避免对驾驶员产生干扰，CDD显示系统需开启防窥模式，即只希望副驾驶可以看见显示CDD显示系统上显示的画面，且驾驶员视角方向不明显可见，定义这种显示模式为第二防窥模式。
在还一种有需要的使用场景中，例如当CDD显示系统显示包含导航信息的画面时，CDD显示系统需开启共享模式，即驾驶员和副驾驶可同时观看CDD显示系统上显示的画面，且其他视角方向不明显可见，定义这种显示模式为第二共享模式。
当观察者的观察方向与显示面的法线之间的夹角较小(例如，该夹角位于0度至±20度之间)时，可以认为观察者在主视角区域中观察显示画面；当观察者的观察方向与显示面的法线之间的夹角较大(例如，该夹角位于±45度至±60度之间)时，可以认为观察者在副视角区域中观察显示画面。为此，对于CDD显示系统，副驾驶在主视角区域中观察CDD显示系统显示画面，而驾驶员在副视角区域中观察CDD显示系统显示画面。
请参考图1和图2，图1是本申请实施例提供的一种背光模组的爆炸图，图2是图1示出的背光模组在X-Z平面的结构示意图。该背光模组可以包括：面光源000、第一导光板100和第一光源200。
该第一导光板100与面光源000在厚度方向上层叠设置，且该第一导光板100位于面光源000的出光侧。
该第一光源200位于第一导光板100的侧面，该第一光源200与第一导光板100在面光源000的出光面所在平面上的正投影无交叠。
其中，背光模组的厚度方向为Z方向，面光源000的出光面为垂直于厚度方向的平面，也即是X-Y平面。
可选地，面光源000为直下式背光(例如，Mini-LED背光)面光源，或者面光源000为侧入式背光面光源。
示例的，请参考图2，图2示出了当面光源000和/或第一光源200开启时的光路图。当面光源000开启时，该面光源000可以发出光线，当面光源000具有较大范围的发光角度时(例如，最大出光角度与显示面的法线方向的夹角小于90度且大于-90度；例如，最大出光角度与显示面的法线方向的夹角为±89度；例如，最大出光角度与显示面的法线方向的夹角为±80度；例如最大出光角度 与显示面的法线方向的夹角为±60度)，车内人员都可以看到显示画面，此时背光模组处于第一共享模式。当第一光源200开启，且面光源000关闭时，该背光模组发出的光线集中在副视角区域内，背光模组处于大视角模式。在这种情况下，主视角区域内的光线亮度较低，而副视角区域内的光线亮度较高。当该背光模组集成在显示装置中时，可以在副视角区域内观察到显示装置的显示画面，而在主视角区域内难以观察到显示装置的显示画面，或者主视角区域内观察到显示装置的显示画面不明显可见，此时背光模组处于第一防窥模式。可以理解的是，当面光源000开启，且第一光源200开启时，此时背光模组处于第一共享模式，并且可以进一步增强副视角区域内的光线亮度。
示例的，请继续参考图2，面光源000可以为准直面光源。当面光源000为准直面光源时，该面光源具有较窄的发光角度(例如，最大出光角度与显示面的法线方向的夹角为±30度；例如，最大出光角度与显示面的法线方向的夹角为±20度；例如，最大出光角度与显示面的法线方向的夹角为±15度)。当第一光源200关闭，且准直面光源000开启时，主视角区域内的光线亮度较高，而副视角区域内的光线亮度较低；当该背光模组集成在显示装置中时，可以在主视角区域内观察到显示装置的显示画面，而在副视角区域内难以观察到显示装置的显示画面，或者副视角区域内观察到显示装置的显示画面不明显可见，此时背光模组处于第二防窥模式。当第一光源200开启，且准直面光源000开启时，主视角和副视角可同时观看CDD显示系统上显示的画面，而由于面光源000采用准直面光源，当该背光模组集成在显示装置中时，主视角和副视角之外的其他视角区域内难以观察到显示装置的显示画面，或者其他视角区域内观察到显示装置的显示画面不明显可见，此时背光模组处于第二共享模式。可以理解的是，当第一光源200开启，且准直面光源000关闭时，此时背光模组处于第一防窥模式。
综上所述，本申请实施例提供的背光模组，包括：面光源、第一导光板和第一光源。由于在该背光模组中，第一导光板位于面光源的出光侧，因此第一光源发出的光线仅经过第一网点反射后，即可从背光模组中出射，而无需再经过其他膜层。如此，降低了第一光源发出的光线在传播过程中的损失，提高了该背光模组在共享模式时，副视角区域内的光线亮度，进而提高了包含有该背光模组的显示装置在处于共享模式时，显示画面的亮度，提高了显示装置的显示效果。
在一些具体实施例中，请参考图1和图2，第一光源200为条状光源；第一 网点101为棱镜结构，第一网点101的长度方向与第一光源000的光源条延伸方向平行。该第一网点101用于打破第一光源200出射的光线在第一导光板100内的全反射，以便光线从副视角射出。
更具体地，该第一光源200可以为发光二极管(英文：Light-Emitting Diode；简称：LED)灯条。该第一光源200可以包括：成一列或阵列排布的多个LED发光单元200a。条状光源表示第一光源200所有LED发光单元组成的整体形状为条状；例如，第一光源200可以是由m×n个LED发光单元组成的矩形阵列，具有m列和n行LED发光单元，其中m<n；第一光源200可以设计为m列LED发光单元沿着第一导光板100的厚度方向分布，n行LED发光单元沿着条状光源的延伸方向分布。需要说明的是，该LED发光单元200a的编号在图2中未进行标注，而在后文中的图25中进行了标注。可以理解的是，该条状光源还可以为连续光源，例如均匀出光的面光源或线光源。
优选地，请参考图1至图4，其中图3是图2示出的背光模组中的第一网点在X-Z平面的主视图；图4是图2示出的第一网点在X-Y平面的俯视图。第一网点101为三棱镜结构；第一网点101具有与第一导光板100接触的第一侧面101a，以及与第一侧面100连接的第二侧面101b和第三侧面101c。其中，第一侧面101a与第二侧面101b之间具有第一夹角θ1，第一侧面101a与第二侧面101b之间具有第二夹角γ1，第二侧面101b和第三侧面101c之间具有第三夹角
Figure PCTCN2021088802-appb-000001
优选地，第一侧面101a的形状为矩形。该第一侧面101a在第一网点101的长度方向上(也即，Y方向)的宽度为t，以及第一侧面101a在垂直于第一网点101的长度方向上(也即，X方向)的宽度为b。在一些可选实施例中，第一侧面101a的宽度t可以选择在35微米至100微米范围内，第一侧面101a的宽度b可以选择在20微米至100微米范围内。当第一侧面101a的宽度t可以选择在35微米至100微米范围内，第一侧面101a的宽度b可以选择在20微米至100微米范围内时，可以使光线从副视角方向出射，并且，网点不明显可见。
示例的，第一侧面101a的宽度t可以为35微米、45微米、50微米、55微米、60微米、65微米、75微米、80微米、90微米、100微米中的一个，该第一侧面101a的宽度t的误差范围为±0.01微米，第一侧面101a的宽度b可以为25微米、35微米、40微米、41.7微米、45微米、45.5微米、50微米、51.7微米、 56.3微米、53.5微米、55微米、65微米中的一个，第一侧面101a的宽度b的误差范围为±0.02微米。
在一些可选实施例中，第一夹角θ1的范围可以是20度至70度，第二夹角γ1的范围可以是2度至20度。第一夹角θ1以及第二夹角γ1在上述范围取值时，可以使第一光源200发出的光在副视角区域出射，并第一光源200发出的光在主视角范围内不明显可见，使背光模组的显示效果符合预期。优选地，第一夹角θ1的范围可以是20度至65度，第二夹角γ1的范围可以是2度至15度。
在一些可选实施例中，第一网点101还可以为四棱锥结构。
在一些可选实施例中，第一侧面101a的形状也可以为除矩形以外的其他形状。在这种情况下，将该第一侧面101a在第一网点101的长度方向上(也即，Y方向)的最大宽度t0定义为第一侧面101a在第一网点101的长度方向上的宽度。可选地，t0的范围为35微米至100微米。将第一侧面101a在垂直于第一网点101的长度方向上的最大宽度b0定义为第一侧面101a在垂直于第一网点101的长度方向上的宽度。可选地，b0为的范围为20微米至100微米。
在一些可选实施例中，请参考图3，第三夹角
Figure PCTCN2021088802-appb-000002
还可以具有倒角b1。在一些实施例中，倒角b1为圆弧。可选地，该圆弧的半径小于或等于30微米，使背光模组的显示效果较好。并且，当圆弧半径越小时，越能实现对背光模组视角的准确控制。因此，优选地，该圆弧的半径小于或等于10微米。进一步优选地，该圆弧的半径小于或等于5微米。再进一步优选地，该圆弧的半径小于或等于3微米。
为了实现第二防窥模式以及第二共享模式，面光源可以为准直面光源。请参考图5，图5是另一种图1示出的背光模组在X-Z平面的结构示意图。准直面光源000a与第一导光板100在准直面光源000a的厚度方向上层叠设置。本发明对准直面光源000a的形式不做具体限定，只要保证其在准直面光源000a的出光面的出光角度较窄即可。例如，随着角度变化，准直面光源000a出射的光强下降到最大出射光强的5％时，该出射角度与准直面光源000a出射光强最大的方向的夹角不大于30度；例如，随着角度变化，准直面光源000a出射的光强下降到最大出射光强的5％时，该出射角度与准直面光源000a出射光强最大的方向的夹角不大于20度；例如，随着角度变化，准直面光源000a出射的光强下降到最大出射光强的5％时，该出射角度与准直面光源000a出射光强最大的方 向的夹角不大于15度。本发明对准直面光源000a的最大光强出光方向不做限定；准直面光源000a的最大光强出光方向可以定义为准直面光源000a出射光强最大的方向与法线方向的夹角。例如，准直面光源000a的最大光强出光方向可以和显示面的法线方向相同；例如，准直面光源000a的最大光强出光方向和准直面光源000a出光面的法线方向可以存在一定夹角，例如夹角为5度以内、10度以内或者20度以内。
在一些可选实施例中，请参考图6和图7，图6是本申请实施例提供的另一种背光模组的爆炸图，图7是图6示出的背光模组在X-Z平面的结构示意图。准直面光源000a包括在厚度方向上层叠设置的防窥结构500和第二导光板300；第二导光板300位于防窥结构500远离第一导光板100的一侧，第二导光板300远离防窥结构500的一面具有多个第二网点301。
该准直面光源000a还包括第二光源400，第二光源400位于第二导光板300的侧面，第二光源400与第二导光板300在准直面光源000a的出光面所在平面上的正投影无交叠。
示例的，请参考图8，图8是图6和图7示出的背光模组处于第二防窥模式的光路图，当准直面光源000a开启且第一光源200关闭时，该准直面光源000a可以发出准直光线，以使背光模组处于第二防窥模式。
请参考图9，图9是图6和图7示出的背光模组处于第二共享模式的光路图，当第一光源200开启，且准直面光源000a开启时，该第一光源200发出的光线可以被多个第一网点101反射后出射。该准直面光源000a可以发出准直光线，以使背光模组处于第二共享模式。
在本申请实施例中，请参考图10和图11，图10是本申请实施例提供的又一种背光模组的爆炸图，图11是图10示出的背光模组在X-Z平面的结构示意图。在该背光模组中，准直面光源000a可以包括：在厚度方向上层叠设置的防窥结构500和第二导光板300。该第二导光板300位于防窥结构500远离第一导光板100的一侧，且该第二导光板300远离防窥结构500的一面具有多个第二网点301。该准直面光源000还可以包括：第二光源400。该第二光源400位于第二导光板300的侧面，且该第二光源400与第二导光板300在准直面光源000a的出光面所在平面上的正投影无交叠。如此，该第二光源400发出的光线可以被多个第二网点301反射至防窥结构500，经防窥结构500转换为准直光线，并 从第一导光板100出射。
可选的，第二光源400为条状光源。具体地，该第二光源400可以为LED灯条。该第二光源400可以包括：成一列或阵列排布多个LED发光单元400a。与第一光源为条状光源的定义相同，条状光源表示第二光源400中所有LED发光单元组成的整体形状为条状；例如，第二光源400可以是由p×q个LED发光单元组成的矩形阵列，具有p列和q行LED发光单元，其中p<q；第二光源400可以设计为p列LED发光单元沿着第一导光板100的厚度方向分布，q行LED发光单元沿着条状光源的延伸方向分布。需要说明的是，LED发光单元400a的编号在图11中未进行标注，而在后文中的图25中进行了标注。可以理解的是，该条状光源还可以为连续光源，例如均匀出光的面光源或线光源。
可选地，第一光源200和第二光源400完全相同。
在本申请实施例中，防窥结构500具有多种可能的实现方式，本申请实施例以以下两种可能的实现方式为例进行示意性说明：
在第一种可能的实现方式中，该防窥结构500包括：光栅结构(图中未示出)，在这种情况下，第二网点301可以为圆形网点，该第二网点301可以打破第二光源400发出的光线在第二导光板300内的全反射，使第二光源400发出的光线被第二网点301反射至光栅结构。该光栅结构可以遮挡部分从第二导光板300出射的光线，使第二导光板300出射的光线转换为准直光线，减小背光模组的可视角范围，以实现防窥功能。
在第二种可能的实现方式中，请参考图11，该背光模组中的防窥结构500可以包括：第一衬底501，以及位于该第一衬底501上的多个条状的第一棱镜502，该多个第一棱镜502位于第一衬底501靠近第二导光板300的一侧，且该多个第一棱镜502在第一衬底501上可以紧密排布，紧密排布也即是，任意两个相邻第一棱镜502之间不存在间隙。
优选地，多个第一棱镜502的长度方向与第二光源400的光源条延伸方向(也即是，Y方向)平行，并且，该多个第一棱镜502的长度方向与X-Z平面垂直。如此，该多个第一棱镜502可以在背光模组的出光面(也即是，X-Y平面)的水平方向，且垂直于第二光源400的光源条延伸方向(也即是，X方向)上，将第二导光板300出射的光线收窄，以使背光模组在其出光面的水平方向实现防窥效果。需要说明的是，在本申请中，可以将与第二光源400的光源条延 伸方向垂直且与背光模组的出光面平行的方向定义为背光模组的出光面的水平方向(也即是，X方向)，而将与第二光源400的光源条延伸方向平行且与背光模组的出光面平行的方向定义为背光模组的出光面的竖直方向(也即是，Y方向)。
示例的，请参考图12，图12是图11示出的背光模组处于第二防窥模式的光路图，当第二光源400开启且第一光源200关闭时，第二光源400发出的光线被多个第二网点301反射，且从第二导光板300远离多个第二网点301的一面出射，并射入防窥结构500。该防窥结构500中的第一棱镜501可以将从第二导光板300出射的光线收窄，以使从第二导光板300出射的光线集中在主视角区域内，减小背光模组的可视角范围，以实现背光模组的第二防窥模式。
可选的，该第一衬底501的材料为透光材料，具体可以包括透明高分子材料。优选的，第一衬底501的材料可以为聚对苯二甲酸乙二醇酯(英文：Polyethylene terephthalate；简称：PET)，折射率为1.62至1.65之间，该第一衬底100的厚度范围可以为40微米至160微米，例如，该厚度可以为50微米、75微米、100微米、125微米或150微米，优选为125微米。该第一棱镜502的材料为透光材料，具体可以包括透明高分子材料。优选地，第一棱镜502的材料可以为聚碳酸酯(英文：Polycarbonate；简称：PC)、PET材料或光固化材料。该第一棱镜502的厚度的范围可以为25微米至50微米，例如，该第一棱镜502的厚度可以优选为30微米。当该第一棱镜502的材料为PC材料或PET材料时，该第一棱镜502可以通过热压成型的方式制造，其中，PC材料的折射率在1.58至1.59之间；优选地，第一棱镜502的材料为光固化材料；当该第一棱镜502的材料为光固化材料时，该第一棱镜502可以通过紫外线(英文：Ultraviolet；简称：UV)光照射，固化成型，并且固化成型的光固化材料具有抗划伤性能，以降低第一棱镜502的表面被其他结构划伤的概率。具体地，光固化材料的折射率为1.5至1.57之间。
在一些具体实施例中，请参考图13，图13是图11示出的背光模组中的防窥结构的局部放大图。该第一棱镜502为三棱镜结构，该第一棱镜502具有与第一衬底501接触的第四侧面502a，以及与该第四侧面502a连接的第五侧面502b和第六侧面502c。该第四侧面502a与第五侧面502b之间的第四夹角α，大于或等于第四侧面502a与第五侧面502c之间的第五夹角β，且第一棱镜502 中的第五侧面502b相对与第六侧面502c靠近第二光源400。如此，可以保证第二导光板300出射的光线，在第五侧面502b发生折射，在第一棱镜502的第六侧面502c上发生全反射，以使第二导光板300出射的光线集中在主视角区域内，保证背光模组的防窥效果较好。
可选的，该第四夹角α的角度范围为45度至90度，或者50度至85度，或者60度至72度。该第五夹角β的角度为45度至70度，或者50度至65度，或者55度至60度，或者53度至57度。优选的，该第四夹角α的角度可以为65.5度，69度、70度，71度中的一个，该第四夹角α的误差范围为±1度。该第五夹角β的角度可以为54度、55度、56度中的一个，该第五夹角β的误差范围为±1度。如此，可以保证该背光模组在处于共享模式时，背光模组在副视角区域内的光线亮度较高，并且，可以使从第二导光板300出射的光线，被第一棱镜502折射后的准直度较高，以使第二导光板300出射的光线集中在主视角区域内，保证背光模组的防窥效果较好。在一些实施例中，第四夹角α与第五夹角β的度数可以相等，这样可以减小制作防窥结构500的工艺复杂度，降低成本。例如，第四夹角α与第五夹角β的度数可以都在53度至57度范围内；例如，第四夹角α与第五夹角β的度数可以都为54度，或者55度，或者56度。
在一些具体实施例中，请参考图14，图14是图11示出的防窥结构中的第一棱镜的局部放大图。第一棱镜502中的第五侧面502b和第六侧面502c之间的第六夹角ω处存在倒角。并且，当圆弧半径越小时，越可以实现对背光模组视角的准确控制。在一些实施例中，倒角a为圆弧，该圆弧的半径的范围为小于或等于30微米。优选地，该圆弧的半径的范围为小于或等于5微米。优选地，该圆弧的半径的范围为小于或等于3微米。进一步优选地，该圆弧的半径的范围为小于或等于1.5微米。如此，可以使从第二导光板300出射的光线，被第一棱镜502折射后的准直度较高，以使第二导光板300出射的光线集中在主视角区域内，保证背光模组的防窥效果较好。
优选地，如图11所示，防窥结构500还可以包括：粒子扩散层503，该粒子扩散层503可以包括：透明膜层，以及位于透明膜层内的多个粒子。该粒子为具有散射性能的粒子，第一衬底501出射的光线可以被粒子扩散层503中的散射粒子扩散。如此，该粒子扩散层503可以对从第一衬底501出射的光线起到匀光的作用，以提高从背光模组中出射的光线的均匀性，进而提高包含有该背光 模组的显示装置的显示效果。例如，该粒子可以包括：聚甲基丙烯酸甲酯、聚丁基丙烯酸甲酯、有机硅、二氧化钛和硫酸钡等物质中的至少一种。
在本申请中，该透明膜层的结构有多种可能的实现方式，本申请实施例以以下两种可能的实现方式为例进行示意性说明：
在第一种可能的实现方式中，请参考图15，图15是本申请实施例提供的另一种图10示出的背光模组在X-Z平面的结构示意图，该透明膜层即为第一衬底501。
在第二种可能的实现方式中，如图16所示，图16是本申请实施例提供的又一种图10示出的背光模组在X-Z平面的结构示意图，该透明膜层为第一衬底501远离多个第一棱镜502一侧的膜层。
可选的，该透明膜层中的粒子的浓度范围为10％至90％。该浓度范围是指，透明膜层中的粒子的体积与该透明膜层的体积的比值。
当第一网点101与准直面光源000a配合使用时，优选地，第一侧面101a的形状为矩形。该第一侧面101a在第一网点101的长度方向上(也即，Y方向)的宽度t，以及第一侧面101a在垂直于第一网点101的长度方向上(也即，X方向)的宽度b的取值范围，能够决定第一光源200发出的光线在经过第一导光板100后的射出方向和各视角区域内的光线的亮度。该第一侧面101a在第一网点101的长度方向上的宽度t，和第一侧面101a在垂直于第一网点101的长度方向上的宽度b的取值范围有多种可选的范围。本申请实施例以以下三种情况进行示意性说明：
在第一种情况中，第一侧面101a的宽度t和b的范围可以均在小于10微米或大于200微米范围。当第一侧面101a的宽度t和b的范围均为小于10微米或大于200微米时，若背光模组处于第二共享模式，则该背光模组发出的光线，在主视角区域以及位于主视角区域两侧的两个副视角区域(分别为：与背光模组的出光面的法线方向的夹角为-45度至-60度的区域；与背光模组的出光面的法线方向的夹角为45度至60度的区域)内可以均存在亮度峰值。
在第二种情况中，第一侧面101a的宽度t的范围可以为55微米至200微米，第七侧面101a的宽度b的范围可以为65微米至200微米。当第一侧面101a的宽度t的范围为55微米至200微米，第一侧面101a的宽度b的范围为65微米至200微米时，若背光模组处于第二共享模式，则该背光模组发出的光线，在 主视角区域以及位于主视角区域一侧的副视角区域内(与背光模组的出光面的法线方向的夹角为-45度至-60度的区域)可以均存在亮度峰值。
在第三种情况中，第一侧面101a的宽度t可以选择在10微米至55微米范围内，第一侧面101a的宽度b可以选择在25微米至65微米范围内。当第一侧面101a的宽度t选择在10微米至55微米范围内，第一侧面101a的宽度b选择在25微米至65微米范围内时，若背光模组处于第二共享模式，则该背光模组发出的光线，在主视角区域以及位于主视角区域一侧的副视角区域内(与背光模组的出光面的法线方向的夹角为-45度至-60度的区域)可以均存在亮度峰值，且相较于第二种情况，副视角区域内的光线的亮度较高。
优选地，如图11所示，第一光源200和第二光源400均为条状光源，并且第二光源400的光源条延伸方向与第一光源200的光源条延伸方向相同。进一步优选地，第二网点301为三棱镜，该第二网点301的长度方向与第二光源400的光源条延伸方向平行，也即，如图11所示，第二网点301的长度方向与X-Z平面垂直。该第二网点301用于打破第二光源400出射的光线在第二导光板300内的全反射。如此，当该背光模组应用在车载显示系统中的CDD显示系统中时，该背光模组在CDD显示系统的显示面的水平方向上实现共享模式，提高光线的利用率。其中，背光模组的出光面与CDD显示系统的显示面平行，且与X-Y平面平行，背光模组的出光面和CDD显示系统的显示面的水平方向即为X方向。
当第一棱镜502的长度方向与第二光源400的光源条延伸方向平行，并且当第一侧面101a在第一网点101的长度方向上的宽度t，和第一侧面101a在垂直于第一网点101的长度方向上的宽度b的取值范围为第三种情况时，请参考图17，图17是图11示出的背光模组处于第二共享模式的光路图，在第一光源200开启后，第一光源200发出的光线被多个第一网点101反射，且从第一导光板100远离多个第一网点101的一面出射。该第一光源200发出的光线集中在与背光模组的出光面的法线方向的夹角为-45度至-60度的副视角区域内，而位于主视角区域另一侧的副视角区域内尽可能不存在光线。如此，当该背光模组集成在车载显示系统中的CDD显示系统中时，由于驾驶员通常位于副驾驶的一侧，该副驾驶在主视角区域内观看画面，驾驶员在主视角区域一侧的副视角区域观看画面。因此，若在主视角区域以及位于主视角区域一侧的副视角区域均存在亮度峰值，而位于主视角区域另一侧的副视角区域不存在亮度峰值，则可以有效的 提高对背光模组出射的光线的利用率。
同时，由前述可知，在第二光源400开启后，第二光源400发出的光线发出的光线集中在主视角区域内。
因此，当第一光源300开启，且第二光源400开启时，该背光模组即可处于第二共享模式。且对于该背光模组发出的光线，在主视角区域以及位于主视角区域一侧的副视角区域均存在亮度峰值，而位于主视角区域另一侧的副视角区域不存在亮度峰值。其中，该背光模组发出的光线在副视角区域内的亮度可以达到主视角区域内的亮度的70％以上，提高包含有背光模组的显示装置在副视角区域的亮度，进而提高了第二共享模式下，显示装置的显示效果。
示例的，请参考图18，图18是图11示出的背光模组处于第二防窥模式的光束分布示意图。在图18中，原点O为背光模组的出光面中的任意一点，通常为背光模组的中心点。以原点O为圆心的各个半圆代表：各个不同的亮度，单位为：坎德拉每平方米。经过原点O的各条直线代表：各个不同的观察方向与背光模组的出光面的法线之间的夹角，其中，当夹角为0度时，表示观察方向垂直于背光模组的出光面；当夹角的角度为负数时，表示观察方向位于背光模组的出光面的法线的一侧(例如，左侧)；当夹角的角度为正数时，表示观察方向位于背光模组的出光面的法线的另一侧(例如，右侧)。需要说明的是，图18中的粗实线表示背光模组的出光面在水平方向上的光束的亮度分布；细实线表示在背光模组的出光面在竖直方向上的光束的亮度分布。当背光模组处于第二防窥模式时，第二光源400发出的光线被多个第二网点301反射，且从第二导光板300远离多个第二网点301的一面出射，并射入防窥结构500。该防窥结构500中的第一棱镜501可以将从第二导光板300出射的光线收窄，以使从第二导光板300出射的光线集中在背光模组的出光面的中心区域A内。
如图19所示，图19是图11示出的背光模组处于第二共享模式光束分布示意图。其中，图19示出的线条的含义可以参考图18，在此不再赘述。当背光模组处于第二共享模式时，第一光源200发出的光线被多个第一网点101反射，且从第一导光板100远离多个第一网点101的一面出射。该第一光源200发出的光线集中在与背光模组的出光面的法线方向的夹角为-45度至-60度的区域B内。同时，由前述可知，在第二光源400开启后，第二光源400发出的光线发出的光线集中在中心区域A内。需要说明的是，图19中的粗实线表示背光模组的 出光面在水平方向上的光束的亮度分布；细实线表示在背光模组的出光面在竖直方向上的光束的亮度分布。
在一些具体实施例中，请参考图20和图21，图20是图11示出的背光模组中的第二网点301在X-Z平面的主视图；图21是图11示出的第二网点301在X-Y平面的俯视图。第二网点301为三棱镜结构，第二网点301具有与第二导光板300接触的第七侧面301a，以及与第七侧面301a连接的第八侧面301b和第九侧面301c，第七侧面301a与第八侧面301b之间具有第七夹角θ2，第七侧面301a与第八侧面301b之间具有第八夹角γ2，第八侧面301b和第九侧面301c之间具有第九夹角
Figure PCTCN2021088802-appb-000003
优选地，第七侧面301a的形状为矩形。该第七侧面301a在第二网点301的长度方向上(也即，Y方向)的宽度v，以及第七侧面301a在垂直于第二网点301的长度方向上(也即，X方向)的宽度c。
可选地，该第七侧面301a在第二网点301的长度方向上(也即，Y方向)的宽度v的范围为35微米至100微米，第七侧面301a在垂直于第二网点301的长度方向上(也即，X方向)的宽度c的范围为20微米至100微米。当从c和v取上述范围时，可以使第二防窥态的亮度和视角达到理想状态，保证显示装置的显示效果。优选地，该第七侧面301a在第二网点301的长度方向上(也即，Y方向)的宽度的范围为10微米至55微米，第七侧面301a在垂直于第二网点301的长度方向上(也即，X方向)的宽度的范围为40微米至55微米。
示例的，第七侧面301a在第二网点301的长度方向上的宽度的可以为35微米、45微米、50微米、55微米中的一个，该第七侧面301a在第二网点301的长度方向上的宽度的误差范围为±0.01微米，第七侧面301a在垂直于第二网点301的长度方向上的宽度的可以为45微米、45.5微米、50微米、51.7微米、53.5微米、55微米中的一个，第七侧面301a在垂直于第二网点301的长度方向上的宽度的误差范围为±0.02微米。
优选地，请参考图20，第八夹角γ2大于第七夹角θ2，且第二网点301中的第八侧面301b相对于第九侧面301c靠近第二光源400。如此，可以保证第二网点301对第二光源400发出的光线的控制精度，进而保证背光模组的防窥效果。
在本申请中，第八夹角γ2的角度范围可以为10度至90度，或者15度至60度，或者30度至60度，或者40度至60度，或者55度至60度，或者20度至45度，或者25度至35度，或者26度至30度；第五夹角θ的角度范围可以 为1度至30度，或者1度至20度，或者1.5度至5度，或者1.5度至4度，或者1.5度至3度。其中，当该背光模组处于防窥模式时，该第八夹角γ1的角度越小，该背光模组在主视角区域内的光线的亮度越低；当该背光模组处于共享模式时，该第八夹角γ2的角度越大，该背光模组在副视角区域内的光线的亮度越低。
示例的，该第八夹角γ2的角度可以为26.5度、27.5度、28.5度、29.5度中的一个，该第八夹角γ2的误差范围为±0.5度。在这种情况下，可以保证当背光模组处于防窥模式和共享模式时，该背光模组在主视角区域和副视角区域内的亮度均较高。
请参考图22和图23，图22是第七夹角θ2的角度为20度时第二导光板的光路图，图23是第七夹角θ2的角度在小于或等于5度范围内时对应第二导光板的光路图。在第二导光板300的尺寸和第二光源400发出的光线均相同的情况下，当第五夹角θ的角度为20度时，一个第二网点301会打破较大范围内第二光源400出射的光线在第二导光板300的全反射；当第七夹角θ2的角度在小于或等于5度范围内时，一个第二网点301仅打破较小范围内第二光源400出射的光线在第二导光板300的全反射。也即是，第七夹角θ2越小，第二网点301对第二光源400发出的光线的控制精度越高。优选地，第七夹角θ2的角度在小于或等于3.5度范围内。考虑制作工艺的难度，第七夹角θ2的角度在1.5度至3.5度范围内。
示例的，该第七夹角θ2可以为1.5度、2度、2.5度、3度、3.5度中的一个，该第五夹角θ的误差范围为±0.5度。如此，第二网点301对第二光源400发出的光线的控制精度较高，可以保证该背光模组的防窥效果。
在本申请一些实施例中，请参考图20，第二网点301中的第八侧面301b与第八侧面301c之间的第九夹角
Figure PCTCN2021088802-appb-000004
处存在倒角b2。在一些实施例中，倒角b2为圆弧。为保证该背光模组处于防窥模式时的防窥效果较好，该圆弧的半径需小于或等于30微米。优选地，当该圆弧半径不大于10微米时，可以保证该背光模组处于共享模式，主视角区域内和副视角区域内的光线亮度较高；进一步优选地，该圆弧的半径小于或等于5微米，如此，可以保证当该背光模组处于防窥模式和共享模式时，主视角区域和副视角区域内的光线亮度均较高。再进一步优选地，该圆弧的半径可以小于或等于3微米。如此，可以进一步提高当该背光模组处 于防窥模式和共享模式时，主视角区域和副视角区域内的光线亮度。
在一些可选实施例中，第二网点301还可以为四棱锥结构。
在一些可选实施例中，第七侧面301a的形状也可以为除矩形以外的其他形状。在这种情况下，将该第七侧面301a在第二网点301的长度方向上(也即，Y方向)的最大宽度v0定义为第七侧面301a在第二网点301的长度方向上的宽度。可选地，v0的范围为35微米至100微米。将第七侧面301a在垂直于第二网点301的长度方向上的最大宽度c0定义为第七侧面301a在垂直于第二网点301的长度方向上的宽度。可选地，c0为的范围为20微米至100微米。
在本申请一些具体实施例中，第一网点101与第二网点301的形状和大小可以均相同，也即是，第一网点101和第二网点301的尺寸和角度可以均相同。
在本申请一些具体实施例中，该第一网点101与第二网点301的朝向可以相同，也可以相反。
优选地，第一导光板100中任意位置处的第一网点101的密度，与第一光源200和任意位置处的距离呈正相关，也即是，第一导光板100中任意位置处的第一网点101的密度，随着该任意位置处与第一光源200之间的距离增大而具有增大趋势。同理，第二导光板300中任意位置处的第二网点301的密度，与第二光源400和任意位置处的距离呈正相关。如此，可以保证光线在第一导光板100和第二导光板300中均匀的传输，提高了背光模组亮度的均匀性。
可选的，第一导光板100和第二导光板300的材料可以包括：聚甲基丙烯酸甲酯(英文：Polymethyl methacrylate；简称：PMMA)、PC材料、PET材料或者光固化材料，折射率可以在1.3至1.65的范围内选择。例如，第一导光板100和第二导光板300包括PC材料，PC材料的折射率在1.58至1.59之间。第一网点101和第二网点301可以通过注塑工艺或者热压工艺制造而成。该第一导光板100和第二导光板300的厚度可以根据包含有该背光模组的显示装置的尺寸确定。例如，当包含有该背光模组的显示装置为手机时，该第一导光板100和第二导光板300的厚度的范围均为300微米至500微米，例如，该第一导光板100和第二导光板300的厚度均可以为400微米或500微米。当包含有该背光模组的显示装置为CDD显示系统时，该第一导光板100和第二导光板300的厚度的范围均为1800微米至2100微米，例如，该第一导光板100和第二导光板300的厚度均可以为2000微米。
需要说明的是，第一导光板100和第二导光板300的材料可以相同，也可以不相同。
在本申请一些具体实施例中，第一网点101与第一导光板100的第一组合体，可以和第二网点301与第二导光板300的第二组合体完全相同，这样第一组合体和第二组合体通过一次开发工艺即可制造而成，节约开发成本的同时降低了工艺的复杂度。
在本申请实施例中，请参考图11，准直面光源000还可以包括：位于第二导光板400远离防窥结构500一侧的反射片600。如图24所示，图24是图11示出的背光模组中反射片的光路图。该反射片600可以用于将从第二网点301中透射出的光线重新反射回第二导光板300，提高了光线的利用率，提高了背光模组在防窥模式下出射的光线的亮度。
可选的，该反射片600为镜面反射片。例如，该反射片600可以为银反射片或增强器镜面反射片(英文：Enhanced Specular Reflector；简称：ESR)。如此，该反射片600可以将从第一网点101中透射出的光线以镜面反射的形式反射回第二导光板300，避免第二光源400发出的光线发生散射，保证背光模组的防窥效果。
在本申请中，请参考图11，该准直面光源000还可以包括：位于第二导光板300和反射片600之间的棱镜层700。该棱镜层700可以包括：第二衬底701，以及位于第二衬底701上的多个条状的第二棱镜702，该第二棱镜702位于第二衬底701靠近第二导光板300的一侧，且该多个第二棱镜702的长度方向与第二光源300的光源条延伸方向垂直。其中，该第二棱镜702的长度方向与X-Z平面平行，且该多个第二棱镜702在第二衬底702上紧密排布，也即是，任意两个相邻第二棱镜702之间不存在间隙。如此，该第二棱镜702可以将背光模组的出光面的竖直方向上的光束收窄，以提高背光模组的整体亮度。
需要说明的是，该第二衬底701远离第二棱镜702的一面可以为反射面。例如，可以在第二衬底701远离第二棱镜702的一面涂覆反射材料。如此，该背光模组中无需设置反射片600，简化了该背光模组的膜层结构。
优选地，第二棱镜702具有与第二衬底701接触的第十侧面，以及与第十侧面连接的第十一侧面和第十二侧面。该第十侧面和第十一侧面之间的第十夹角的角度，等于第十侧面和第十二侧面之间的第十一夹角的角度，且该第十一侧 面与第十二侧面之间的第十二夹角的角度为90度，也即是，该第二棱镜702在Y-Z平面的横截面为等腰直角三角形。
示例的，请参考图25和图26，图25是本申请实施例提供的一种不包含有棱镜层的背光模组的在Y-Z平面的光路图，图26是图11示出的背光模组在Y-Z平面的光路图。与图25相比，图26示出的背光模组的出光面的竖直方向上光束被收窄，且亮度峰值明显提高，该背光模组的整体亮度可以增加20％至30％。
示例的，请参考图27，图27是本申请实施例提供的一种背光模组在背光模组的出光面的竖直方向上的光束分布示意图。除线条的粗细代表的含义外，图27的含义可以参考图18，在此不再赘述。在图27中，粗实线表示不包含有第二棱镜702在背光模组的出光面的竖直方向上的光束分布，细虚线表示包含有第二棱镜702在背光模组的出光面的竖直方向上的光束分布。根据图27可以看出，对于包含有第二棱镜702的背光模组，其在背光模组的出光面的竖直方向上的光束被收窄，且亮度提高。
在本申请实施例中，请参考图28，图28是本申请实施例提供的另一种背光模组在Y-Z平面的结构示意图。第一导光板100远离多个第一网点101的一面可以具有多个条状的第三棱镜102，第二导光板300远离多个第二网点301的一面可以具有多个条状的第四棱镜302，该多个第三棱镜102的长度方向和多个第四棱镜302的长度方向均与第二棱镜702的长度方向平行。其中，该多个第三棱镜102在第一导光板100上可以紧密排布，紧密排布即指，任意两个相邻第三棱镜102之间不存在间隙。该多个第四棱镜302在第一导光板300上可以紧密排布，紧密排布即指，任意两个相邻第四棱镜302之间不存在间隙。
在本申请中，第三棱镜102和第四棱镜302的形状和结构有多种可能的实现方向，本申请实施例以以下两种可能的实现方式为例进行示意性说明：
在第一种可能的实现方式中，该第三棱镜102和第四棱镜302的形状和结构与第二棱镜702的形状和结构相同，在此不再赘述。
在第二种可能的实现方式中，请参考图28，该第三棱镜102和第四棱镜302在Y-Z平面的横截面均为弓形。
需要说明的是，在其他的可选的实现方式中，该第三棱镜102和第四棱镜302的横截面的形状还可以均为梯形。本申请实施例在此不做限定。
如此，该第三棱镜102和第四棱镜302也可以将背光模组的出光面的竖直 方向上的光束收窄，进一步提高背光模组的整体亮度。
需要说明的是，该背光模组仅需要保证其具有：第一导光板100上的第三棱镜102、第二导光板200上的第四棱镜302和棱镜层700中的至少一个，便能够将背光模组的出光面的竖直方向上的光束收窄。
在本申请中，请参考图29，图29是本申请实施例提供的又一种背光模组的结构示意图，该背光模组还可以包括：框体800。背光模组中的第一导光板100、第二导光板300、防窥结构500、第一光源200以及第二光源400均位于框体800内。
可选的，如图29所示，框体800可以包括：背板801，该背板801具有依次连通的第一凹槽801a、第二凹槽801b和第三凹槽801c，该第一凹槽801a的开口面与第二凹槽801b的底面共面，且该第二凹槽801b的开口面与第三凹槽801c的底面共面。其中，反射片600位于第一凹槽801a内，第二导光板300和第二光源400均位于第二凹槽801b内，第一导光板100和第一光源200均位于第三凹槽801c内，且防窥结构200也位于第二凹槽801b。该背板801可以对背光模组中的各膜层结构进行有效的支撑。
同时，反射片600位于第一凹槽801a内，第二导光板300和第二光源400均位于第二凹槽801b内，第一导光板100和第一光源200均位于第三凹槽801c内，可以选择性地使第一导光板100与反射片600之间具有一定的距离和/或第二导光板300与防窥结构500之间具有一定的距离，以避免第一导光板100中的第一网点101与反射片600的表面和/或第二导光板300中的第二网点301与防窥结构500的表面相互施加力的作用而产生损伤，影响包含有该背光模组的显示装置的显示效果。
需要说明的是，由于第一导光板100与反射片600之间的距离和第二导光板300与防窥结构500之间的距离的大小，与背光模组的整体亮度的衰减程度呈正相关，因此，该第一导光板100与反射片600之间的距离和第二导光板300与防窥结构500之间的距离的范围不宜过大，以保证背光模组的整体亮度较高。
可选的，第一导光板100与反射片600之间的距离和第二导光板300与防窥结构500之间的距离的范围可以均在不小于0.1毫米且不大于0.5毫米的范围内。
需要说明的是，可以在防窥结构500与第二导光板300之间设置环状的支 撑结构，以使防窥结构500与第二导光板300之间具有一定的距离，避免防窥结构500中的第一棱镜502与第二导光板300的表面相互施加力的作用而产生损伤。该距离的范围可以为0.1毫米至0.5毫米。
在本申请中，框体800还可以包括：与背板801的边缘连接的胶框802，该胶框802具有面板承载部802a，该面板承载部802a用于承载显示面板。
在本申请实施例中，第一光源200和第二光源400在框体800中的位置关系有多种可能的实现方式，本申请实施例以以下两种可能的实现方式为例进行示意性说明：
在第一种可能的实现方式中，如图28所示，第一光源200和第二光源400位于框体800的同一侧。如此，可以减小背光模组的边框的宽度。
在第二种可能的实现方式中，如图30所示，图30是本申请实施例提供的再一种背光模组的结构示意图。第一光源200和第二光源400分别位于框体800相对的两侧。如此，有利于背光模组在工作过程中进行散热。
综上所述，本申请实施例提供的背光模组，包括：准直面光源、第一导光板和第一光源。由于在该背光模组中，第一导光板位于准直面光源的出光侧，因此第一光源发出的光线仅经过第一网点反射后，即可从背光模组中出射，而无需再经过其他膜层。如此，降低了第一光源发出的光线在传播过程中的损失，提高了该背光模组在共享模式时，副视角区域内的光线亮度，进而提高了包含有该背光模组的显示装置在处于共享模式时，显示画面的亮度，提高了显示装置的显示效果。
本申请实施例还提供了一种显示装置，该显示装置可以包括显示面板和上述背光模组。示例的，如图31所示，图31是本申请实施例提供的一种显示装置的结构示意图。该显示装置包括上述任意一种背光模组以及显示面板001，该显示面板001位于背光模组中的面板承载部802a上。可选的，该显示面板001可以通过泡棉002与背光模组连接。
该显示面板001为液晶显示面板，该显示面板001可以包括：相对设置的阵列基板和彩膜基板，以及位于阵列基板远离彩膜基板一侧的第一偏振片和位于彩膜基板远离阵列基板一侧的第二偏振片。
该显示装置可以为：液晶面板、电子纸、手机、平板电脑、电视机、显示器、 笔记本电脑、数码相框、导航仪以及车载显示系统中的CDD显示系统等任何具有显示功能的产品或部件。
可以理解的是，该显示装置的应用场景不限于车载显示系统中的CDD显示系统。
需要指出的是，在附图中，为了图示的清晰可能夸大了层和区域的尺寸。而且可以理解，当元件或层被称为在另一元件或层“上”时，它可以直接在其他元件上，或者可以存在中间的层。另外，可以理解，当元件或层被称为在另一元件或层“下”时，它可以直接在其他元件下，或者可以存在一个以上的中间的层或元件。另外，还可以理解，当层或元件被称为在两层或两个元件“之间”时，它可以为两层或两个元件之间惟一的层，或还可以存在一个以上的中间层或元件。通篇相似的参考标记指示相似的元件。
在本申请中，上述实施例中关于术语“范围”的描述，其应包含端点值。例如，术语“范围为45度至90度”，该范围包含端点值45度和端点值90度。
在本申请中，术语“第一”和“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。术语“多个”指两个或两个以上，除非另有明确的限定。
以上所述仅为本申请的可选的实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (32)

  1. 一种背光模组，其特征在于，包括：
    面光源；
    与所述面光源在厚度方向上层叠设置的第一导光板，所述第一导光板位于所述面光源出光侧，所述第一导光板靠近所述面光源的一面具有多个第一网点；
    以及，第一光源，所述第一光源位于所述第一导光板的侧面，所述第一光源与所述第一导光板在所述面光源的出光面所在平面上的正投影无交叠。
  2. 根据权利要求1所述的背光模组，其特征在于，
    所述第一光源为条状光源；
    所述第一网点为棱镜结构，所述第一网点的长度方向与所述第一光源的光源条延伸方向平行；
    所述第一网点为三棱镜结构，所述第一网点具有与所述第一导光板接触的第一侧面，以及与所述第一侧面连接的第二侧面和第三侧面，所述第一侧面与所述第二侧面之间具有第一夹角，所述第一侧面与所述第三侧面之间具有第二夹角，所述第二侧面和第三侧面之间具有第三夹角。
  3. 根据权利要求2所述的背光模组，其特征在于，
    所述第一侧面在所述第一网点的长度方向上的宽度的范围为35微米至100微米，所述第一侧面在垂直于所述第一网点的长度方向上的宽度的范围为20微米至100微米。
  4. 根据权利要求2所述的背光模组，其特征在于，
    所述第一夹角的取值范围为20度至70度，所述第二夹角小于或等于20度。
  5. 根据权利要求2所述的背光模组，其特征在于，
    所述第三夹角处存在倒角，所述倒角为圆弧，所述圆弧的半径小于或等于30微米。
  6. 根据权利要求1-5任意一项所述的背光模组，其特征在于，
    所述面光源为准直面光源。
  7. 根据权利要求6所述的背光模组，其特征在于，
    所述准直面光源包括在厚度方向上层叠设置的防窥结构和第二导光板；
    所述第二导光板位于所述防窥结构远离所述第一导光板的一侧，所述第二导光板远离所述防窥结构的一面具有多个第二网点；
    所述准直面光源还包括第二光源，所述第二光源位于所述第二导光板的侧面，所述第二光源与所述第二导光板在所述准直面光源的出光面所在平面上的正投影无交叠。
  8. 根据权利要求7所述的背光模组，其特征在于，
    所述防窥结构包括：第一衬底，以及位于所述第一衬底上的多个条状的第一棱镜，所述多个第一棱镜位于所述第一衬底靠近所述第二导光板的一侧。
  9. 根据权利要求8所述的背光模组，其特征在于，
    所述第二光源为条状光源，所述第二光源的光源条延伸方向与所述第一光源的光源条延伸方向相同；
    所述多个第一棱镜的长度方向与所述第二光源的光源条延伸方向平行。
  10. 根据权利要求9所述的背光模组，其特征在于，
    所述第一棱镜为三棱镜结构，所述第一棱镜具有与所述第一衬底接触的第四侧面，以及与所述第四侧面连接的第五侧面和第六侧面；
    所述第四侧面与所述第五侧面之间的第四夹角，大于或等于所述第四侧面与所述第六侧面之间的第五夹角，且所述第一棱镜中所述第四侧面相对于所述第五侧面靠近所述第二光源。
  11. 根据权利要求10所述的背光模组，其特征在于，
    所述第四夹角的角度范围为45度至90度，所述第五夹角的角度为45度至70度。
  12. 根据权利要求10所述的背光模组，其特征在于，
    所述第四夹角的角度范围为60度至72度，所述第四夹角的角度范围为53度至57度。
  13. 根据权利要求10所述的背光模组，其特征在于，
    所述第五侧面与第六侧面之间的第六夹角处存在倒角，所述倒角为圆弧，所述圆弧的半径小于或等于30微米。
  14. 根据权利要求10所述的背光模组，其特征在于，
    所述防窥结构还包括：粒子扩散层，所述粒子扩散层包括：透明膜层以及位于所述透明膜层内的多个粒子；
    其中，所述透明膜层为所述第一衬底，或者，所述透明膜层为所述第一衬底远离所述多个第一棱镜一侧的膜层。
  15. 根据权利要求14所述的背光模组，其特征在于，
    所述透明膜层内的粒子的浓度范围为10％至90％。
  16. 根据权利要求9所述的背光模组，其特征在于，
    所述第二网点为三棱镜结构，所述第二网点的长度方向与所述第二光源的光源条延伸方向平行；
    所述第二网点具有与所述第二导光板接触的第七侧面，以及与所述第七侧面连接的第八侧面和第九侧面；
    所述第七侧面与所述第八侧面之间具有第七夹角，所述第七侧面与所述第九侧面之间的第八夹角，所述第八侧面与第九侧面之间具有第九夹角。
  17. 根据权利要求16所述的背光模组，其特征在于，
    所述第四侧面在所述第二网点的长度方向上的宽度的范围为35微米至100微米，所述第四侧面在垂直于所述第二网点的长度方向上的宽度的范围为20微米至100微米。
  18. 根据权利要求16所述的背光模组，其特征在于，
    所述第七夹角大于所述第八夹角，且所述第二网点中的所述第八侧面相对于所述第九侧面靠近所述第二光源。
  19. 根据权利要求18所述的背光模组，其特征在于，
    所述第七夹角的角度范围为10度至90度，所述第八夹角小于或等于30度。
  20. 根据权利要求19所述的背光模组，其特征在于，
    所述第七夹角的角度为26度至30度，所述第八夹角小于或等于5度。
  21. 根据权利要求16所述的背光模组，其特征在于，
    所述第八侧面与所述第九侧面之间的第九夹角处存在倒角，所述倒角为圆弧，所述圆弧的半径小于或等于30微米。
  22. 根据权利要求21所述的背光模组，其特征在于，
    所述圆弧的半径小于或等于5微米。
  23. 根据权利要求21所述的背光模组，其特征在于，
    所述第一网点与所述第二网点的形状和大小均相同。
  24. 根据权利要求7所述的背光模组，其特征在于，
    所述防窥结构包括：光栅结构。
  25. 根据权利要求7-24任意一项所述的背光模组，其特征在于，
    所述准直面光源还包括：位于所述第二导光板远离所述防窥结构一侧的反射片。
  26. 根据权利要求25所述的背光模组，其特征在于，
    所述准直面光源还包括：位于所述第二导光板和所述反射片之间的第二衬 底，以及位于所述第二衬底上的多个条状的第二棱镜，所述第二棱镜位于所述第二衬底靠近所述第二导光板的一侧，且所述多个第二棱镜的长度方向与所述第二光源的光源条延伸方向垂直。
  27. 根据权利要求25所述的背光模组，其特征在于，
    所述第一导光板远离所述多个第一网点的一面具有多个条状的第三棱镜，和/或，所述第二导光板远离所述多个第二网点的一面具有多个条状的第四棱镜，所述多个第三棱镜的长度方向和所述多个第四棱镜的长度方向均与所述第二光源的光源条延伸方向垂直。
  28. 根据权利要求7-24任意一项所述的背光模组，其特征在于，
    所述背光模组还包括：框体；所述第一导光板、所述第二导光板、所述防窥结构、所述第一光源以及所述第二光源均位于所述框体内。
  29. 根据权利要求28所述的背光模组，其特征在于，
    所述框体包括：背板，所述背板具有依次连通的第一凹槽、第二凹槽和第三凹槽，所述第一凹槽的开口面与所述第二凹槽的底面共面，所述第二凹槽的开口面与所述第三凹槽的底面共面；
    其中，所述反射片位于所述第一凹槽内，所述第二导光板和所述第二光源均位于所述第二凹槽内，所述第一导光板和所述第一光源均位于所述第三凹槽内。
  30. 根据权利要求29所述的背光模组，其特征在于，
    所述框体还包括：与所述背板边缘连接的胶框，所述胶框具有面板承载部，所述面板承载部用于承载显示面板。
  31. 根据权利要求29所述的背光模组，其特征在于，
    所述第一光源和所述第二光源位于所述框体的同一侧，或者，所述第一光源和所述第二光源分别位于所述框体相对的两侧。
  32. 一种显示装置，其特征在于，包括：
    显示面板，以及如权利要求1至31任意一项所述的背光模组。
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