WO2007129415A1 - 光学フィルムおよびその製造方法ならびに表示装置 - Google Patents
光学フィルムおよびその製造方法ならびに表示装置 Download PDFInfo
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- WO2007129415A1 WO2007129415A1 PCT/JP2006/317883 JP2006317883W WO2007129415A1 WO 2007129415 A1 WO2007129415 A1 WO 2007129415A1 JP 2006317883 W JP2006317883 W JP 2006317883W WO 2007129415 A1 WO2007129415 A1 WO 2007129415A1
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- WIPO (PCT)
- Prior art keywords
- transparent substrate
- optical film
- curable resin
- columnar
- light
- Prior art date
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- Ceased
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
Definitions
- the present invention relates to an optical film having a convex shape on the surface, a method for producing the same, and a display device incorporating the optical film.
- CRTs cathode ray tubes
- liquid crystal display devices for example, classified according to the illumination method used when displaying an image.
- an image is displayed using a light source placed behind a liquid crystal panel.
- a transmissive display device for example, a liquid crystal display device.
- the power consumption of the display device is extremely large, which is an obstacle to extending the battery driving time.
- the percentage of power consumption of the backlight used in display devices is extremely large, so it is possible to extend the battery drive time by keeping this power consumption as low as possible.
- the practical value of mono products is increased. It becomes possible to raise.
- simply reducing the power consumption of the backlight is not preferable because the brightness of the backlight is significantly reduced and it is difficult to see the screen display of the display device. Therefore, measures to reduce the power consumption of the backlight without significantly reducing the brightness of the knocklight have been proposed.
- Patent Document 1 discloses a method of arranging an optical film having a plurality of columnar prisms on the surface between a liquid crystal panel and a light source.
- this optical film will be specifically described with reference to FIGS.
- FIG. 12 shows an example of a cross-sectional structure of a transmission type display device 100 incorporating lens films 112 and 113 as the optical film.
- FIG. 13 shows an enlarged part of the cross section of the lens film 112.
- This display device 100 is mainly composed of a liquid crystal panel 120 and a lighting device 110 (i.e., Iwayu) placed behind the liquid crystal panel 120 (that is, opposite to the observation side). Backlight).
- a lighting device 110 i.e., Iwayu
- the illumination device 110 includes a light source 111, lens films 112 and 113, a diffusion sheet 114, a lamp reflector 115, a light guide plate 116, and a reflection sheet 117.
- the liquid crystal panel 120 mainly includes the polarizing plate 121, the transparent substrate 122, the color filter 123, the transparent electrode 124, the alignment film 125, the liquid crystal layer 126, the alignment film 127, the transparent pixel electrode 128, the transparent substrate 129, and the polarization in order of the observation side force.
- a board 130 is provided.
- the light emitted from the light source 111 is reflected by the lamp reflector 115 and the reflection sheet 117 and directed toward the liquid crystal panel 120, and is spread over the entire surface of the liquid crystal panel 120 by the light guide plate 116. Then, the light is evenly diffused by the diffusion sheet 114, condensed by the lens films 1 12 and 113, and emitted to the liquid crystal panel 120.
- the light incident on the liquid crystal panel 120 is transmitted to the viewing side according to the magnitude of the voltage applied to each pixel by a drive circuit (not shown).
- the lens Finolems 112 and 113 between the liquid crystal nonlinear 120 and the diffusion sheet 114, the light emitted from the light source 111 can be efficiently incident on the liquid crystal panel 120. As a result, it is possible to reduce the power consumption of the knock light without significantly reducing the brightness of the knock light.
- the lens films 112 and 113 are formed by, for example, applying uncured curable resin to a transparent substrate and reversing the shape of the columnar prism as described in Patent Documents 2 to 5. It can be manufactured by pressing the matrix having the surface to the curable resin, curing the curable resin in this state, and transferring the shape of the columnar prism.
- Patent Document 1 Japanese Utility Model Publication No. 3-69184
- Patent Document 2 JP-A-4-356746
- Patent Document 3 Japanese Patent Application Laid-Open No. 5-314545
- Patent Document 4 JP-A-5-325272
- Patent Document 5 JP-A-6-47806
- the lens film obtained by the above manufacturing method the lens film largely warps to the curable resin side due to shrinkage accompanying the hardening of the curable resin.
- the strength of the transparent base material is lowered, and the rate of shrinkage accompanying the curing of the curable resin is increased, so that the optical film is significantly warped toward the curable resin side.
- Even if a large warp occurs in the lens film in this way it is possible to place the warp in the display device while suppressing the warp.
- it after being placed in the display device, it may partially contact other adjacent optical components due to warping, causing Newton rings or scratches, resulting in a decrease in display quality of the display device. There was a problem.
- the present invention has been made in view of a serious problem, and an object of the present invention is to provide an optical film having a small warp even when the transparent substrate is thinned, a manufacturing method thereof, and the optical film. Another object is to provide a display device.
- the optical film of the present invention is configured by arranging columnar prisms made of curable resin on a transparent base material having a flexible material force along the extending direction.
- the transparent substrate is in contact with the valleys between the columnar prisms adjacent to each other.
- the display device of the present invention includes a panel, a light source that emits light for illuminating the panel, and one or more optical films provided between the panel and the light source.
- the transparent base material is in contact with the valleys of the columnar prisms adjacent to each other, a layer that does not function as a prism between the transparent base material and the columnar prism, There is no so-called soot layer.
- soot layer literally includes the case where there is no soot layer at all, or the case where the soot layer remains slightly (for example, 0.28 m or less) due to a manufacturing error or the like. It is a concept.
- the height of the surface force of the columnar prism on the transparent substrate becomes the minimum necessary level, and the volume of the curable resin is smaller than when the cocoon layer is present.
- there is no ridge layer there is almost no portion where adjacent columnar prisms contact each other.
- the method for producing an optical film of the present invention includes the following steps (A) to (D).
- (A) A step of disposing uncured curable resin on a transparent substrate made of a flexible material.
- the projections formed by simply pressing the matrix projections against the curable resin are pressed against the transparent substrate.
- so-called soot layers As a result, the height of the surface force of the transparent base material of the columnar prism becomes a necessary minimum size, and the volume of the curable resin is smaller than when the cocoon layer is present.
- there is no ridge layer there is almost no portion where adjacent columnar prisms are in contact with each other.
- the optical film, the manufacturing method thereof, and the display device of the present invention since there is no cocoon layer between the transparent base material and the columnar prism, the cocoon layer is present and is cured more than the case. The volume of natural rosin is reduced. Thereby, the warp of the optical film due to the shrinkage accompanying the curing of the curable resin can be greatly reduced. In addition, since there is almost no part where adjacent columnar prisms come into contact with each other, the strain caused by the shrinkage accompanying the curing of the curable resin is not organically combined. Thereby, the warp of the optical film can be almost eliminated. As a result, even when the transparent substrate is thinned, an optical film with small warpage can be realized. By disposing such an optical film with a small warp in the display device, there is no possibility of occurrence of Yuton rings or scratches, and the display quality of the display device can be improved.
- FIG. 1 is a cross-sectional view illustrating an example of a configuration of a display device according to an embodiment of the present invention.
- FIG. 2A is a cross-sectional view illustrating an example of a configuration of an upper lens film.
- FIG. 2B is a cross-sectional view illustrating an example of a configuration of a lower lens film.
- FIG. 3A is a cross-sectional view illustrating another example of the configuration of the upper lens film.
- FIG. 3B is a cross-sectional view illustrating another example of the configuration of the lower lens film.
- FIG. 4 is a schematic diagram showing an example of the configuration of a lens film manufacturing apparatus.
- FIG. 5 is a cross-sectional view for explaining an example of the operation of the transfer device of FIG.
- FIG. 6 is a cross-sectional view for explaining another example of the operation of the transfer device of FIG.
- FIG. 7 is a schematic diagram for explaining the form of warping of the lens film.
- FIG. 8 is a schematic diagram showing an example of a method for measuring the amount of warpage of a lens film.
- FIG. 9 is a cross-sectional photograph of a lens film.
- FIG. 10 is a relationship diagram for explaining the relationship between the depth of the dent or the thickness of the ridge layer and the amount of warpage.
- FIG. 11 is a schematic diagram showing an example of a method for measuring a relative luminance ratio of a lens film.
- FIG. 12 is a cross-sectional view illustrating an example of a configuration of a conventional display device.
- FIG. 13 is a cross-sectional view illustrating an example of the configuration of the lens film in FIG.
- FIG. 1 shows a cross-sectional structure of a display device 1 according to an embodiment of the present invention.
- the display device 1 is a transmissive display device that displays an image by active matrix driving.
- the display device 1 includes a liquid crystal panel 20 and a lighting device 10 disposed behind the liquid crystal panel 20.
- the liquid crystal panel 20 has a laminated structure having a liquid crystal layer 26 between a transparent substrate 22 on the observation side and a transparent substrate 29 on the illumination device 10 side. Specifically, in order of observation side force, polarizing plate 21, transparent substrate 22, color filter 23, transparent electrode 24, alignment film 25, liquid crystal layer 26, alignment film 27, transparent pixel electrode 28, transparent substrate 29, polarizing plate 30 And a diffusion sheet 31.
- the polarizing plates 21 and 30 are a kind of optical shirter, and allow only light (polarized light) having a certain vibration direction to pass therethrough. These polarizing plates 21 and 30 are arranged so that the polarization axes thereof are different from each other by 90 degrees, so that the light emitted from the illumination device 10 is transmitted or blocked through the liquid crystal layer 26. ing.
- the transparent substrates 22 and 29 are also substrates that are transparent to visible light, for example, plate glass force.
- the transparent substrate 29 on the illumination device 10 side is an active type drive including a TFT (Thin Film Transistor) as a drive element electrically connected to the transparent pixel electrode 28 and wiring. A circuit is formed.
- TFT Thin Film Transistor
- the color filter 23 emits light emitted from the lighting device 10, for example, red (R), green (G), and blue.
- the transparent electrode 24 is made of, for example, ITO (Indium Tin Oxide) and commonly used. Functions as a counter electrode.
- the alignment films 25 and 27 are also made of a polymer material such as polyimide, and perform alignment treatment on the liquid crystal.
- the liquid crystal layer 26 is made of, for example, a liquid crystal in a VA (Vertical Alignment) mode, a TN (Twisted Nematic) mode, or an STN (Super Twisted Nematic) mode, and is illuminated by an applied voltage from a driving circuit (not shown). It has the function of transmitting or blocking the light emitted from the device 10 for each pixel.
- VA Vertical Alignment
- TN Transmission Nematic
- STN Super Twisted Nematic
- the transparent pixel electrode 28 is also configured with, for example, an ITO force and functions as an electrode for each pixel.
- the diffusion sheet 31 has a function of diffusing the light emitted from the illumination device 10 in the same manner as the diffusion sheet 14 (described later) to reduce unevenness in brightness.
- the diffusion sheet 31 is provided as necessary.
- the illumination device 10 includes a laminated structure in which lens films 12A and 13A (optical film), a diffusion sheet 14, a light guide plate 16, and a reflective sheet 17 are laminated in order from the observation side, and the laminated structure.
- a light source 11 disposed on the side surface and a lamp reflector 15 disposed around the light source 11 are provided.
- a part of the lamp reflector 15 is open toward the above laminated structure.
- the illumination device 10 has a so-called edge light type configuration.
- the light source 11 includes, for example, a cold cathode fluorescent lamp called a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED), and the like.
- CCFL cold cathode fluorescent lamp
- LED light emitting diode
- the lamp reflector 15 has a function of reflecting a part of the light emitted from the light source 11 in the direction of the light guide plate 16. As a result, the light emitted from the light source 11 can be used efficiently.
- the light guide plate 16 has a function of propagating light emitted from the light source 11 while totally reflecting it and spreading the light over the entire surface of the liquid crystal panel 20. As a result, the light emitted from the light source 11 can be converted into plane light.
- the reflection sheet 17 has a function of reflecting light that is about to leak from the light guide plate 16 to the inside of the light guide plate 16. As a result, similarly to the lamp reflector 15 described above, the light emitted from the light source 11 can be used efficiently!
- the diffusion sheet 14 emits the planar light spread on the entire surface of the liquid crystal panel 20 by the light guide plate 16. It has a function of diffusing and reducing unevenness of brightness. Thereby, light with uniform brightness is irradiated on the entire surface of the liquid crystal panel 20.
- the lens films 12A and 13A are respectively triangular prisms 12A2 having triangular prisms on the transparent substrate 12A1 (13A1) as shown in FIGS. (13A2) are arranged along the extending direction, and have a striped valley 12A3 (13A3) having a depth D1 between columnar prisms 12A2 (13A2) adjacent to each other. .
- the columnar prism 12A2 (13A2) has an inclined surface 12A4 (13A4) extending to the surface of the transparent substrate 12A1 (13A1).
- the columnar prism 12A2 and the columnar prism 13A2 are arranged so that their extending directions intersect each other (for example, 90 degrees different from each other), and the function of aligning the direction of light with the direction of the liquid crystal panel 20 Have! /
- the transparent substrate 12A1 (13A1) is a transparent resin sheet having a thickness D2 which also has a flexible material force, and a trough portion 12A3 (13A3) is formed on the planar surface of the transparent substrate 12A1 (13A1). ) Is touching. That is, there is no ridge layer between the transparent substrate 12A1 (13A1) and the columnar prism 12A2 (13A2).
- the phrase “no cocoon layer” includes literally no cocoon layer or a case where a slight cocoon layer (for example, less than 0.28 m) remains due to manufacturing errors.
- the thickness A Dy of the cocoon layer is completely zero force or extremely small value, and the distance D3 between the bottom and the top of the columnar prism 12A2 (13A2) (that is, the height of the columnar prism 12A2 (13A2)) ) Is completely equal to or nearly equal to the depth D1 of the valley 12A3 (13A3).
- the recesses 12B5 (13B5) having a depth AD x (Dl -D3) are periodically formed.
- a transparent substrate 12B1 (13B1) having a convex curved surface 12B6 (13B6) may be provided between adjacent depressions 12B5 (13B5).
- the transparent substrate 12B1 (13B1) has an inclined surface 12B4 (13B4) that extends to the inner wall of the recess 12B5 (13B5) and contacts the surface of the transparent substrate 12B K13B1).
- a columnar prism 12B2 (13B2) having a concave curved surface in contact with the convex curved surface 12B6 (13B6) on the transparent substrate 12B1 (13B1) side is provided on the transparent substrate 12B1 (13B1). There is no gap between the material 12B 1 (13B 1) and the columnar prism 12B2 (13B2)! /. Therefore, the columnar prism 12B2 (13B2) is placed on the transparent substrate 12B1 (13B1).
- the lens film 12B (13B) has no soot layer.
- the distance D3 (that is, the height of the columnar prism 12B2 (13B2)) between the concave curved surface of the columnar prism 12B2 (13B2) and the top is smaller than the depth D1 of the valley portion 12B3 (13B3).
- the transparent base materials 12A1 (13A1) and 12B1 (13B1) are generically referred to as the transparent base material 12A1, etc.
- the other constituent elements are also generically named in the same manner. Shall.
- Examples of the flexible material described above include materials that are resistant or permeable to the energy used when forming the columnar prism 12A2 and the like in the manufacturing process.
- the columnar prism 12A2 Are molded using active energy rays such as ultraviolet rays and electron beams, etc., materials that transmit these active energy rays, such as polyester-based resin, acrylic resin, polycarbonate-based resin, vinyl chloride, etc.
- a system resin and a polymethacrylimide series resin are preferred.
- the columnar prism 12A2 and the like are formed of a curable resin cured by heating or irradiation with active energy rays such as ultraviolet rays or electron beams.
- the curable resin include polyesters, epoxy resins, polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, and other (meth) acrylate resins.
- (Meth) acrylate-based rosin is preferable in that it has good optical properties and the like.
- a polymerization initiator by active energy rays such as polyvalent acrylate is contained as a main component of the curable resin.
- the convex curved surface 12B 6 (13B6) is provided on the surface of the transparent substrate 12B1 (13B1) (see FIGS. 3 (A) and (B)), the refractive index of the curable resin described above is transmitted.
- the convex curved surface 12B6 (13B6) on the surface of the transparent substrate 12 Bl (13B1) can be made to function as a condenser lens. .
- FIG. 4 shows a schematic configuration of the lens film manufacturing apparatus 30.
- FIG. 5 shows an example of a cross-sectional configuration when the lens film 12A (13A) is formed by the transfer device 35 of FIG.
- FIG. 4 is an enlarged view of an example of a cross-sectional configuration when the lens film 12B (13B) is formed by the transfer device 35 of FIG.
- the curable resin P is not shown.
- the lens film manufacturing apparatus 30 includes a brewing device 31 that supplies the transparent substrate S, a speed adjusting device 32 that adjusts the feed speed of the transparent substrate S supplied from the brewing device 31, and an uncured material.
- the transfer device 35 for transferring the prism shape to P to form the lens film 12A etc., the release device 36 for releasing the lens film 12A etc. from the transfer device 35, and the winding device for taking up the lens film 12A etc. 37 It consists of the following.
- the transfer device 35 includes press rolls 35A and 35B that rotate about the rotation axis X, a forming roll 35C that rotates about the rotation axis Y parallel to the rotation axis X, and a press roll port. And a light source 35D provided between the screens 35A and 35B.
- the pressing roll 35A is formed by pressing the transparent substrate S on which the curable resin P is applied to a predetermined thickness while pressing the transparent substrate S toward the transparent substrate S side force forming roll 35C with a predetermined pressure. Is sent to the light source 35D side.
- the pressure roll 35B is a light source 35D side while pressing a transparent substrate S having a curable resin P formed on the surface into a predetermined shape from the transparent substrate S side toward the forming roll 35C with a predetermined pressure. The force is also sent to the release device 36 side.
- the forming roll 35C has a matrix formed by arranging columnar protrusions 35C-1 in which the shapes of the columnar prisms 12A2, etc. are inverted along the extending direction.
- the rotation radius R2 of the portion of the forming roll 35C where the protrusion 35C-1 is formed (the distance from the rotation axis Y of the forming roll 35C to the top 35C-2 of the protrusion 35C-1) ) Is larger than the rotation radius R1 of the portion where the protrusion 35C-1 is not formed (the distance from the rotation axis Y of the forming roll 35C to the surface 35C-3 where the protrusion 35C-1 is formed).
- the top 35C-2 of the part 35C-1 can be reliably pressed against the transparent substrate S. Therefore, this transfer device In the device 35, the top 35C-2 should be in contact with the surface of the transparent substrate S by appropriately adjusting the pressure with which the top 35C-2 of the projection 35C-1 is pressed against the transparent substrate S. Furthermore, the top 35C-2 can be embedded in the transparent substrate S to form a depression on the surface of the transparent substrate S and a convex curved surface between adjacent depressions. ing.
- the light source 35D irradiates the curable resin P pressed against the forming roll 35C by the pressing rolls 35A and 35B with active energy rays L such as ultraviolet rays and electron beams, for example, on the transparent substrate S side force. It comes to be.
- active energy rays L such as ultraviolet rays and electron beams
- the transparent base material S supplied from the brewing device 31 is adjusted to a predetermined speed by the speed control device 32, and the transparent base material S is placed on the transparent base material S.
- Uncured curable resin P is dripped by the resin supply device 33.
- the dripping curable resin P is adjusted to a predetermined thickness by the film thickness adjusting device 34, and the film thickness adjusted curable resin P is directed to the forming roll 35B with its surface facing the transfer device 35. Is thrown into.
- the curable resin P is pressed against the forming roll 35B from the transparent substrate S side by the pressing rolls 35A and 35B, and the shape of the columnar prism 12A2 and the like is transferred.
- the recess 12B5 (13B5) is formed in the portion where the adjacent columnar curable resin P is almost swept away, and a convex curved surface is formed between the adjacent recesses 12B5 (13B5).
- 12B6 (13B6) is formed.
- the curvature radius of the curved surface 12B6 (13B6) can be reduced.
- the pressure rolls 35 A, 35B are used to deepen the recess 12B5 (13B5). If the pressure is too high, the depression 12B5 (13B5) of the transparent substrate 12B1 (13B1) may be whitened to reduce the amount of transmitted light, so the depth of the depression 12B5 (13B5) ⁇ Dx
- the depth is preferably such that the transparent substrate 12B1 (13B1) is not whitened (approximately 10% or less of the thickness D2 of the transparent substrate 12B1 (13B1)).
- a part of the light emitted from the light source 11 directly enters the light guide plate 16, and the other light is reflected by the lamp reflector 15 and then enters the light guide plate 16.
- the light incident on the light guide plate 16 is also emitted from the upper surface force of the light guide plate 16, is diffused uniformly by the diffusion sheet 14, directed by the lens film 12A13, and emitted to the liquid crystal panel 20.
- incident light from the illumination device 10 is transmitted according to the magnitude of the voltage applied to each pixel between the transparent pixel electrode 28 and the transparent electrode 24 as the counter electrode. Then, the color is separated by the color filter 23 and emitted to the observation side. As a result, a color image is displayed.
- the conventional lens film 112 has a columnar prism 112-2 on a transparent substrate 112-1 via a collar layer 112-5, and has a collar layer 112-5. This is mainly different from the lens film 12A of the present embodiment.
- the ridge layer 112-5 is a layer that does not function as a prism and is not necessary for optical design.
- the transferability is prevented from deteriorating due to the shrinkage accompanying the hardening of the curable resin. With a certain thickness Layers 112-5 were provided.
- the amount of warpage can be measured using, for example, a height gauge 210 arranged on the surface plate 200 as shown in FIG.
- the height gauge 210 includes a scale 211 extending in a direction perpendicular to the surface plate 200, a movable part 212 that is movably arranged with the scale 211 and extends in a direction parallel to the surface plate 200, and a scale 211.
- the upper force of the measuring object 220 is also gently lowered, and the scale engraved on the scale 211 is read from the position of the moving part 212 at the moment when the lower surface of the moving part 212 contacts the convex surface of the object 220 to be measured. It is possible to measure.
- HD-30A manufactured by MITUTOYO is available as a device that enables such measurements.
- Fig. 7 (A) the case where the surface on which the prism is formed is convexly curved is expressed as being negatively warped, and as shown in Fig. 7 (B), the prism is formed.
- the surface on the opposite side (the resin substrate side) is warped in a convex shape! / We shall express the case of speaking as if it is curled up on the plus side.
- the lens film 12A and the like of the present embodiment it is conventionally considered necessary by forming the valley 12A3 and the like in contact with the transparent substrate 12A1 and the like by using the manufacturing method described above. Because the volume of uncured curable resin P required to form the columnar prism 12A2 etc. has been reduced, the amount of shrinkage associated with the curing of the curable resin P is greatly reduced. To decrease. In addition, since the adjacent columnar prisms 12A2 and the like have almost no portion in contact with each other, the strain caused by the shrinkage accompanying the curing of the curable resin P is not organically combined. Thereby, almost no warp of the lens film 12A or the like can be eliminated.
- the columnar prism 12B2 contracts in the vicinity of the depression 12B5 (13B5) in the transparent base material 12B1 (13B1). Stress is generated in the opposite direction to the stress caused by. As a result, the amount of warpage generated in the lens film 12B is significantly reduced, and the display quality of the display device 1 is extremely good without the possibility of Newton rings or scratches.
- the curable resin P when the uncured curable resin P is cured to transfer the shape of the columnar prism 12A2 or the like by the above-described manufacturing method, the curable resin can be formed without providing a cocoon layer. It has been confirmed by experiments that the transferability does not deteriorate due to the shrinkage accompanying the curing of P (see the cross-sectional photograph in Fig. 9). Therefore, there is no possibility that the display quality of the display device 1 is deteriorated without providing a glazing layer.
- a convex curved surface 12B6 is formed between the depressions 12B5 (13B5). Since (13B6) is formed, the front surface luminance can be improved by causing the curved surface 12B6 (13B6) to function as a condenser lens.
- the columnar prism 112- 2 is required to reduce the pitch of the columnar prism 112-2 while maintaining the inclination angle of the inclined surface 112-4.
- the pitch of the columnar prism 112-2 is made too small, the front brightness actually decreases, so the utility of the lens film 112 originally provided for the purpose of improving the brightness is reduced, which is not preferable. . Therefore, in the case of FIG. 13, in order to reduce the thickness of the lens film 112 without reducing the front luminance, the force to eliminate the ridge layer 112-5 below the columnar prism 1 12-2 is required.
- the transparent layer 12A1 and the trough 12A3 and the like are brought into contact with each other positively by eliminating the layer that was conventionally considered necessary.
- the portion where the adjacent triangular prism-shaped curable resin contacts each other is almost eliminated.
- the distortion caused by the hardening and shrinkage of the adjacent triangular prism-like curable resin is not organically bonded, so that the warp of the lens film 12A and the like can be almost eliminated.
- the lens film 12A or the like does not warp.
- the transparent substrate 12A1 or the like is thinned to reduce the overall thickness of the lens film 12A or the like.
- the front brightness can be increased without changing the overall thickness of the lens film 12A, etc., by making it thinner or thinning the transparent substrate 12A1, etc. and increasing the pitch of the columnar prisms 12A2, etc.
- the width in the arrangement direction of the columnar prisms 12A2 and the like is the width in the arrangement direction of the columnar prisms 12A2 and the like.
- the width (pitch) in the arrangement direction of the columnar prisms 112-2 is 31 ⁇ and the depth D1 of the valley 112-3 is 15 /
- the top angle (vertical angle) of ⁇ , columnar prism 112-2 was 90 °, and the thickness D2 of transparent substrate 112-1 was 50 m.
- the thickness of the soot layer 112-5 is + 0.5 ⁇ , + 6.5 ⁇ , + 17.5 / ⁇ , + 25.5 / ⁇ , +34.5 m (See Table 1).
- FIG. 10 shows the relationship between the depth ( ⁇ ADx) of the depression 12B5 (13B5) of the lens film 12A or the like according to the above example and the amount of warpage on the left side of the drawing, and the lens film according to the above comparative example.
- the relationship between the thickness ADy of the saddle layer 112-5 of Rum 112 and the amount of warpage is shown on the right side of the figure.
- the lens film 12A is used regardless of the depth of the recess 12B5 (13B5), including the case where the transparent substrate 12A1 (13A1) is in contact with the valley 12A3 (13A3). It can be seen that the amount of warping is zero. Accordingly, in the present embodiment, the display quality of the display device 1 that does not cause defects such as Newton's rings or scratches is extremely good, and is therefore very suitable for mopile applications.
- Table 2 shows that the depth (one ADx) is 4 when the brightness of the lens film 12A and the like is 1 when the depth (one ADx) of the depression 12B5 (13B5) is +0.0 m. This indicates the relative luminance ratio of the lens film 12A, etc. when 31 m, 1 3.13 m, 1 2.4 6 ⁇ , -2.04 ⁇ m, -1.21 / zm. For reference, the radius of curvature of the curved surface 12B6 (13B6) corresponding to the depth (-ADx) of the recess 12B5 (13B5) is also shown.
- the luminance of the light that is transmitted through the lens film 12A or the like is shown, for example, in FIG. It was measured using a color luminance meter 300 as described above.
- This color luminance meter 300 is fixed to a surface plate 310 and is fixed to a support portion 320 extending in a direction perpendicular to the surface plate 310 with an opening 300A for taking in light downward.
- the light output from the backlight unit 330 placed on 310 is taken in through the opening 300A, and the brightness of the light is measured.
- the luminance is measured when the lens film 12A or the like is placed on the backlight unit 330 and the backlight unit 330 is turned on, and then the lens film 12A or the like is not placed on the backlight unit 330.
- the relative luminance ratio was obtained by measuring the luminance when the backlight unit 330 was turned on.
- the relative luminance ratio changes depending on the radius of curvature, but the radius of curvature when the relative luminance ratio is greater than 1 is the columnar prism 12B2 (13B 2 )
- the relative luminance ratio becomes larger than 1.
- the depth of the depression 12B5 (13B5) (one A Dx) cannot be generally stated.
- the depth D3 of the valley 12B3 is approximately half the width (pitch) in the arrangement direction of the columnar prism 12B2 (13B2), and the columnar prism 12 B2 (13B2) Taking into account that the top angle (vertical angle) is approximately 90 °, the depth (one A Dx) of the recess 12B5 (13B5) when it is greater than the relative luminance ratio ⁇ is approximately less than 0 m. — A value of 4 m or more.
- Table 3 shows the amount of warpage when the transparent base material 12A1 or the like such as the lens film 12A or the like according to this example is made to have a typical thickness (50 m) or less, and the lens film according to this comparative example. It represents the amount of warping when 112 transparent substrates 122-1 are made to have a thickness (50 m) or more than the conventional thickness.
- Table 3 when the depression 12B5 (13B5) is provided, D1ZD2 is used as the thickness ratio, and the depth (one A Dx) is + 0.O ⁇ m, +0.25. D3ZD2 was used as the thickness ratio in the case of 0.28 m and the case where the ridge layer 112-5 was present.
- the thickness D2 of the transparent substrate 112-1 was set to the conventional typical thickness (50 / zm), and the thickness ⁇ Dy of the cocoon layer 112-5 was +2.0 ⁇ m It can be seen that a large warp occurs in Comparative Example i. Therefore, in order to reduce the warp of the lens film 112, conventionally, the thickness D2 of the transparent base material 112-1 was increased as in Comparative Example k.
- the thickness A Dy of the soot layer is set to +0.
- the thickness of the soot layer is substantially eliminated as in Example g.
- a Dy is set to +0.0 m and eliminating the ridge layer completely.
- the thickness D2 of the transparent substrate 12B1 (13B1) is obtained by rubbing the depth (one ⁇ Dx) of the depression 12B5 (1 3B5) by 0.5 m as in Example f or Example e, for example.
- the warp could be eliminated without increasing the thickness.
- the thickness D2 of the transparent substrate 12B1 (13B1) is made thinner than the conventional one (25 ( ⁇ m), the warp could be eliminated.
- the height D3 of the columnar prism 12B2 (13B2) and the columnar prism 12B while the height H of the lens film 12B (13B) is made lower than before. Since the pitch of 2 (13B2) can be increased, the front luminance can be increased without increasing the height H of the lens film 12B (13B).
- the lens film 12B (13B) could be thinned.
- the transparent substrate 12A1 (13A1) is obtained after substantially eliminating the wrinkle layer by setting the thickness A Dy of the wrinkle layer to +0.28 m as in Example a, for example. Thickness D2 thinner than before
- the warp could be eliminated.
- the entire thickness of the lens film 12A and the like can be reduced, and the front brightness can be increased.
- the lens film 12A and the like may each have a force that has the triangular prismatic columnar prism 12A2 or the like, for example, an aspherical microlens.
- the lens film 12A and the like have a light collecting function, but may have a diffusing function.
- a microprojection may be provided on the back surface of the lens film 12A or the like, or a diffusion material may be applied, or the lens film 12A or the like itself may contain a diffusion material, and the lens film 12A or the like.
- a diffusion sheet or a diffusion plate may be attached to the surface of the substrate.
- the lens films 12A and the like are arranged so that the light of the side force light source 11 such as the transparent base 12A1 is incident thereon.
- the lens film 12A or the like may be disposed on the side opposite to the transparent substrate 12A1 or the like, that is, so that the light from the side force light source such as the columnar prism 12A2 may enter.
- the curable resin P dripped onto the transparent base material S by the resin supply device 33 is adjusted to a predetermined thickness by the film thickness adjusting device 34, so that the transparent
- the force used to apply the uncured curable resin P on the substrate S may be disposed on the transparent substrate S by other methods.
- a transparent substrate S that has been pre-coated with an uncured curable resin P may be provided in the brewing device 31, or the surface of the forming roll 35C may be cured uncured. It is also possible to apply the active resin P in advance and press it with the pressing roll 35A to bring the uncured curable resin P into contact with the transparent substrate S.
- the uncured curable resin P is dropped into a mortar-shaped region formed between the surface and the surface of the transparent substrate S to provide a reservoir for the uncured curable resin P. Apply an uncured curable resin P on S.
- the configuration of the display device 1 has been specifically described, but it is not necessary to include all layers, and other layers (for example, a reflective polarizing plate) are included. It's okay. That is, various selections can be made according to applications and purposes.
- the case where the illumination device 10 is an edge light type has been described, but another type, for example, a direct type may be used. Further, in the above-described embodiments and the like, the force described in the case of the liquid crystal display device 1 is naturally applicable to a display device using other principles.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06783243.6A EP2017655B1 (en) | 2006-05-08 | 2006-09-08 | Optical film, process for producing the same and display apparatus |
| CN2006800281460A CN101233431B (zh) | 2006-05-08 | 2006-09-08 | 光学片及其制造方法和显示装置 |
| KR1020077029040A KR100931343B1 (ko) | 2006-05-08 | 2006-09-08 | 광학 필름 및 그 제조 방법과 표시 장치 |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006129633 | 2006-05-08 | ||
| JP2006-129633 | 2006-05-08 | ||
| JP2006-240839 | 2006-09-05 | ||
| JP2006240839A JP4006650B1 (ja) | 2006-05-08 | 2006-09-05 | 光学フィルムおよびその製造方法ならびに表示装置 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007129415A1 true WO2007129415A1 (ja) | 2007-11-15 |
Family
ID=38660862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2006/317883 Ceased WO2007129415A1 (ja) | 2006-05-08 | 2006-09-08 | 光学フィルムおよびその製造方法ならびに表示装置 |
Country Status (7)
| Country | Link |
|---|---|
| US (3) | US7467886B2 (ja) |
| EP (1) | EP2017655B1 (ja) |
| JP (1) | JP4006650B1 (ja) |
| KR (2) | KR20090086475A (ja) |
| CN (1) | CN101233431B (ja) |
| TW (2) | TW201215928A (ja) |
| WO (1) | WO2007129415A1 (ja) |
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| JP2009128228A (ja) * | 2007-11-26 | 2009-06-11 | Panasonic Electric Works Co Ltd | 赤外線検出器 |
| KR100961701B1 (ko) * | 2008-05-16 | 2010-06-09 | 엘지전자 주식회사 | 광학 시트, 이를 포함하는 백라이트 유닛 및 액정표시장치 |
| KR100961702B1 (ko) * | 2008-05-16 | 2010-06-09 | 엘지전자 주식회사 | 광학 시트, 이를 포함하는 백라이트 유닛 및 액정표시장치 |
| KR100962165B1 (ko) * | 2008-05-28 | 2010-06-10 | 엘지전자 주식회사 | 광학 시트, 이를 포함하는 백라이트 유닛 및 액정표시장치 |
| US7787074B2 (en) | 2008-05-28 | 2010-08-31 | Lg Electronics Inc. | Optical sheet, backlight unit, and liquid crystal display |
| US8023068B2 (en) | 2008-05-16 | 2011-09-20 | Lg Electronics Inc. | Optical sheet, backlight unit, and liquid crystal display |
| TWI845323B (zh) * | 2023-05-30 | 2024-06-11 | 詠巨科技有限公司 | 3d裸視光學膜及顯示裝置 |
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| JP2015219422A (ja) * | 2014-05-19 | 2015-12-07 | Nltテクノロジー株式会社 | 光学部材及び表示装置 |
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| TWI827238B (zh) * | 2022-09-06 | 2023-12-21 | 技嘉科技股份有限公司 | 具有幻彩外觀的板材及其製造方法 |
| CN117698331A (zh) * | 2022-09-06 | 2024-03-15 | 技嘉科技股份有限公司 | 具有幻彩外观的板材及其制造方法 |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2017655B1 (en) | 2014-11-19 |
| CN101233431A (zh) | 2008-07-30 |
| EP2017655A4 (en) | 2012-01-18 |
| KR20090004396A (ko) | 2009-01-12 |
| US20080259612A1 (en) | 2008-10-23 |
| US20070258030A1 (en) | 2007-11-08 |
| JP2007328314A (ja) | 2007-12-20 |
| KR100931343B1 (ko) | 2009-12-11 |
| EP2017655A1 (en) | 2009-01-21 |
| US7483224B2 (en) | 2009-01-27 |
| CN101233431B (zh) | 2011-12-14 |
| JP4006650B1 (ja) | 2007-11-14 |
| TW200742875A (en) | 2007-11-16 |
| US20080179768A1 (en) | 2008-07-31 |
| KR20090086475A (ko) | 2009-08-12 |
| TWI465777B (zh) | 2014-12-21 |
| US7467886B2 (en) | 2008-12-23 |
| US7901600B2 (en) | 2011-03-08 |
| TW201215928A (en) | 2012-04-16 |
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