WO2005017581A2 - Dispositif de retroeclairage - Google Patents

Dispositif de retroeclairage Download PDF

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Publication number
WO2005017581A2
WO2005017581A2 PCT/IB2004/051456 IB2004051456W WO2005017581A2 WO 2005017581 A2 WO2005017581 A2 WO 2005017581A2 IB 2004051456 W IB2004051456 W IB 2004051456W WO 2005017581 A2 WO2005017581 A2 WO 2005017581A2
Authority
WO
WIPO (PCT)
Prior art keywords
light
luminance
prism sheet
backlight device
angle
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/IB2004/051456
Other languages
English (en)
Other versions
WO2005017581A3 (fr
Inventor
Akimitsu Tsuda
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to JP2006523108A priority Critical patent/JP2007503007A/ja
Priority to US10/567,170 priority patent/US20060250818A1/en
Priority to EP04769808A priority patent/EP1664867A2/fr
Publication of WO2005017581A2 publication Critical patent/WO2005017581A2/fr
Publication of WO2005017581A3 publication Critical patent/WO2005017581A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G02B6/0033—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
    • G02B6/0051—Diffusing sheet or layer

Definitions

  • the present invention relates to a backlight device used as a light source of liquid crystal display devices, in particular to a backlight device using the luminance improving film.
  • a light source provided inside the device is mainly used, while exterior light is partially used.
  • a backlight is used.
  • the backlight is arranged on the rear side of the liquid crystal cell as viewed from the display side of the device.
  • the backlight is mainly comprised of a light guide plate such that its main surface is provided opposite and substantially parallel to the surface of the rear side of the liquid crystal cell, and an edge light (side light) that is arranged on an edge surface side of the light guide plate and that emits light to the edge surface. Further, a reflective sheet is arranged on the opposite side to the liquid crystal cell side of the light guide plate.
  • the light from the edge light propagates inside the light guide plate is reflected by the light emitting means provided on the light guide plate and the reflective sheet arranged outside the light guide plate, thereby changed in propagation direction toward the liquid crystal cell, and incident on the liquid crystal cell.
  • a prism sheet which has a plurality of projections in the shape of a prism on its surface, is arranged on the liquid crystal cell side of the light guide plate.
  • Fig. 1 shows the conventional prism sheet.
  • the prism sheet 1 has a plurality of projections 2 in the shape of a prism on its surface. In the projections 2, each vertex angle is set at about 90 degrees.
  • the light in various directions incident from the lower side (flat surface) of the light guide plate is changed in its direction to a substantially vertical direction by the projections 2 of the prism sheet 1 (see arrows in Fig.l).
  • the prism sheet 1 By thus arranging the prism sheet 1 on the liquid crystal cell side of the light guide plate, it is possible to change light in various directions from the light guide plate to the substantially vertical direction, improve the light-gathering characteristic, and improve the luminance in the vertical direction of the liquid crystal panel.
  • a backlight device comprises the light guide means that has a pair of main faces facing each other and edge faces and that guides the light from a light source arranged at one of the edge faces, luminance/ luminance- viewing angle improvement means that is arranged on the side of one main face of the light guide means and that emits the light in a substantially normal direction to the main face and in the direction having a predetermined angle to the normal direction, and reflective means arranged on the other main face of the light guide means.
  • the luminance/luminance- viewing angle improvement means is an asymmetric prism sheet having a plurality of projections on its main face.
  • the projections of the asymmetric prism sheet have a first base angle ⁇ of 75 ° to 90 ° and a second base angle ⁇ of 45 ° to 60 ° .
  • the projections of the asymmetric prism sheet have a first base angle ⁇ of 85 ° and a second base angle ⁇ of 50 ° .
  • the first base angle ⁇ of the projections is positioned in the side of the light source.
  • diffusion means is arranged between the light guide means and the luminance/ luminance- viewing angle improvement means.
  • a symmetric prism sheet which has a plurality of projections on its main face, is arranged between the diffusion means and the luminance/luminance-viewing angle improvement means.
  • the asymmetric prism sheet is arranged such that a ridge of the projection is perpendicular to a ridge of the projection of the symmetric prism sheet.
  • Fig.1 shows a part of a conventional prism sheet
  • FIG.2 diagrammatically shows an arrangement of a backlight device according to an Embodiment of the present invention
  • FIG.3 shows a part of a prism sheet in the backlight device according to an Embodiment of the present invention
  • Figs.4 and 5 show light paths in the prism sheet shown in Fig.3;
  • Fig.6 shows a graph for explaining an effect of the backlight device according to an Embodiment of the present invention
  • FIGs.7(a) and 7(b) show a mobile phone with the backlight device according to an Embodiment of the present invention
  • Fig.8 shows a PDA with the backlight device according to an Embodiment of the present invention.
  • FIG.9 shows a car navigation system with the backlight device according to an Embodiment of the present invention. Best Mode
  • Fig. 2 is a view diagrammatically showing an arrangement of a backlight device according to an Embodiment of the present invention.
  • the backlight device of the present invention has a light guide plate 11 having main surfaces 11a and edge surfaces lib.
  • An edge light (side light) 12 is arranged on one edge surface side of the light guide plate 11.
  • An LED is generally used as the edge light.
  • a diffusion sheet 13 for diffusing light emitted from the light guide plate 11 is arranged on the main surface 1 la on the liquid crystal cell side of the light guide plate 11.
  • the diffusion sheet 13 enables presence of the backlight not to be recognized when viewed from the panel display screen.
  • the diffusion sheet 13 does not need to be always arranged.
  • a symmetric prism sheet 14 is arranged on the diffusion sheet 13. Examples used as the symmetric prism sheet 14 is BEF (Trade Name, Sumitomo 3M).
  • the symmetric prism sheet 14 has a plurality of projections in the shape of a prism on its surface, and is arranged so that ridges of the projections are along the traveling direction of light from the light source.
  • the symmetric prism sheet controls light in the left and right of traveling direction of the light from the light source. Accordingly, by providing the symmetric prism sheet 14, it is possible to enhance the light-gathering characteristic in the left and right of traveling direction of the light from the light source to improve the luminance. Therefore, using the sheet 14 together with an asymmetric prism sheet (described later) enables further improvements in the luminance in the vertical direction and in the luminance in wide-viewing angle directions.
  • asymmetric prism sheet 15 On the symmetric prism sheet 14 is arranged an asymmetric prism sheet 15 that is the luminance/luminance-viewing angle improvement means.
  • the asymmetric prism sheet 15 has a structure as shown in Fig. 3.
  • Fig. 3 shows a part of the prism sheet of the backlight device according to an Embodiment of the present invention.
  • the asymmetric prism sheet 15 has a plurality of projections 17 having a prism shape on its surface.
  • the projection 17 comprises a first inclined surface (easy-slope inclined surface) 17a having a relatively gentle slope, and a second inclined surface (steep-slop inclined surface) 17b having a relatively steep slope.
  • a base angle 17d on the side of the second surface 17b is ⁇ ° and a base angle 17c on the side of the first surface 17a is ⁇ ° .
  • Ridges of the projection 17 are arranged to be along the direction (depth direction of the sheet as viewed in the figure) substantially perpendicular to the traveling direction of the light from the light source.
  • the asymmetric prism sheet 15 is arranged such that the ridge of the projection 17 is substantially perpendicular to a ridge of the projection of the symmetric prism sheet.
  • the asymmetric prism sheet 15 controls light in the traveling direction of the light from the light source.
  • the light enters the asymmetric prism sheet 15, which has the above- mentioned structure, from the bottom surface 15a (light guide plate 11), the light is mainly emitted in a substantially vertical direction (a direction inclined by a relatively small angle to the vertical direction) in the first inclined surface 17a (see arrows X), and is mainly emitted in an inclined direction (a direction inclined by a relatively large angle to the vertical direction) in the second inclined surface 17b (see arrows Y).
  • the base angles ⁇ and ⁇ are desired to be set so as to emit the light mainly in the substantially vertical direction, while emitting the light mainly in the inclined direction, as described above.
  • the inclined direction is determined depending on the luminance-viewing angle of the backlight device.
  • the angle ⁇ is desired to range from 75 ° to 90 °
  • the angle ⁇ preferably ranges from 45 ° to 60 ° .
  • it is preferable that the angle ⁇ is 85 ° and that the base angle ⁇ is 50 ° .
  • a material of the asymmetric prism sheet 15 is a material with a refractive index of 1.4 to 1.6.
  • Example as the material of the asymmetric prism sheet 15 includes resin materials such as acryl-based resin, norbornene-based resin and polycarbonate.
  • a reflective sheet 16 is arranged on the opposite direction (the side where the diffusion sheet 13 is not arranged) to the liquid crystal cell side of the light guide plate 11.
  • Figs. 4 and 5 are views for explaining light paths in the prism sheet shown in Fig. 3.
  • an LED as a light source is arranged on the observer's left, a nd the light travels in the direction from left to right as viewed from the observer.
  • the light A incident on the asymmetric prism sheet 15 at an angle of ⁇ 1 to the vertical direction is refracted by the bottom surface 15a of the asymmetric prism sheet 15, further refracted by the first inclined surface 17a of the projection 17, and emitted toward the liquid crystal cell from the asymmetric prism sheet 15.
  • the base angle of the projection 17 is positioned on the light source side, the emitted light has an angle of ⁇ 2 to the vertical direction. The light is thus emitted in the substantially vertical direction, and therefore, contributes to improvements in the luminance in the vertical direction.
  • nl represents a refractive index of the asymmetric prism sheet.
  • nl represents a refractive index of the asymmetric prism sheet.
  • the backlight device with the structure as described above is arranged on the rear side (opposite side to the display side) of the liquid crystal cell in a liquid crystal display device.
  • the light from the edge light 12 of the backlight device propagates inside the light guide plate 11, and a part of the light is emitted directly to the liquid crystal cell side, while the other part of the light is reflected by the reflective sheet 16 arranged on the opposite side to the liquid crystal cell side of the light guide plate 11.
  • the light reflected by the reflective sheet 16 is passed through the light guide plate 11 and emitted to the liquid crystal cell side.
  • the light emitted from the light guide plate 11 is diffused by the diffusion sheet 13.
  • the light passed through the diffusion sheet 13 is controlled by the symmetric prism sheet 14 so that the light-gathering characteristic is enhanced in left-right directions (directions to the left and right to the traveling direction of light from the light source). Then, the light passed through the symmetric prism sheet 14 is refracted by the projection 17 of the asymmetric prism sheet 15, and emitted in the substantially vertical direction, while being emitted in the inclined direction, as described above.
  • the asymmetric prism sheet 15 emits the light in the normal direction to the main surface of the light guide plate and in the direction at a predetermined angle to the normal direction. Thus emitted light is incident on the liquid crystal cell.
  • the light is emitted in the substantially vertical direction, while being emitted in the inclined direction, and it is thereby possible to improve the luminance in the vertical direction of the liquid crystal display device, while realizing a wide luminance-viewing angle.
  • Three backlights were prepared such that on one main surface of the light guide plate are laminated the diffusion sheet, the symmetric prism sheet and the asymmetric prism sheet in this order, the reflective sheet is provided on the other main surface of the light guide plate, and that an LED is arranged as an edge light on one edge surface side of the light guide plate.
  • the three backlights are respectively set for combinations of base angles ⁇ and ⁇ of a projection of the asymmetric prism sheet, (88 ° , 45 ° ) (Example 1), (88 ° , 50 ° ) (Example 2) and (88 ° , 55 ° ) (Example 3).
  • a backlight was prepared such that on one main surface of the light guide plate are laminated the diffusion sheet, and two symmetric prism sheets (BEF) in this order, the reflective sheet is provided on the other main surface of the light guide plate, and that an LED is arranged as an edge light on one edge surface side.
  • BEF symmetric prism sheets
  • Liquid crystal display devices were obtained by combining four backlights and a liquid crystal panel. A simulation was carried out on the luminance- viewing angle of each of the liquid crystal display devices. Luminance of the light on the backlight was measured in the simulation. The luminance of the light was measured in a generally- used luminance meter, and the luminance at each angle was obtained. It is herein assumed that the normal direction to the light-emitting surface of the backlight is viewing angle 0 ° . Fig. 6 shows the simulation results.
  • each of liquid crystal display devices (Examples 1 to 3) using the backlight according to the present invention exhibits high luminance in the vertical direction, while having a wide luminance- viewing angle.
  • each of the devices has a higher value than that of the liquid crystal display device of the comparative example.
  • the liquid crystal display device of the comparative example exhibits high luminance in the vertical direction, but the luminance- viewing angle thereof is narrow.
  • Fig. 7(a) is a view showing a mobile phone with a conventional backlight device
  • Fig. 7(b) is a view showing a mobile phone with the backlight device according to the present invention.
  • a mobile phone 22 with the backlight device of the present invention has a luminance- viewing angle wider than that of a mobile phone 21 with the conventional backlight device, and therefore, enables an image display with a wide range and excellent viewing.
  • FIG. 8 is a view showing a PDA with the backlight device according to the present invention. Also in this case, a PDA 31 with the backlight device of the present invention has a luminance- viewing angle wider than that of a PDA with the conventional backlight device, and therefore, enables image display with a wide range and excellent viewing.
  • Fig. 9 is a view showing a car navigation system with the backlight device according to the present invention.
  • a monitor 41 for the car navigation system with the backlight device of the present invention has a luminance- viewing angle wider than that of a monitor with the conventional backlight device, and therefore, enables an image display with a wide range and excellent viewing.
  • an image displayed on the monitor 41 installed on the passenger side can be viewed in an excellent viewing state to a person at the driver seat as well as a person at the seat next to the driver.
  • the present invention is not limited to the aforementioned Embodiment, and is capable of being carried into practice in various modifications thereof.
  • the aforementioned Embodiment describes the case of applying the backlight device according to the present invention to a liquid crystal display device for each of a mobile phone, PDA and car navigation system.
  • the present invention is further applicable to liquid crystal display devices for all applications requiring the luminance in the vertical direction and wide luminance-viewing angle.
  • the Embodiment describes the case of using the asymmetric prism sheet as the luminance/luminance viewing angle improvement means, but the present invention is not limited to such a case. As long as a member emits an incident light in the substantially vertical direction, while emitting the light in the inclined direction, any member is usable other than the asymmetric prism sheet.
  • the diffusion sheet and/or reflective sheet in the Embodiment is not limited to the shape of a sheet, and may be in the shape of a plate or a film, as long as the diffusion effect and/or reflection effect is exhibited, respectively.
  • the symmetric prism sheet is not limited to the shape of a sheet either, as long as its function is exhibited.
  • the backlight device of the present invention comprises light guide means that has a pair of main faces facing each other and a pair of edge faces facing each other and that guides the light from a light source arranged at one of the edge faces, luminance/luminance- viewing angle improvement means that is arranged in the side of one main face of the light guide plate and that emits the light in a substantially normal direction to the main face and in the direction having a predetermined angle to the normal direction, and reflective means arranged on the other main face of the light guide means. It is thereby possible to realize a liquid crystal display device exhibiting the improved luminance in the vertical direction and the wide luminance- viewing angle.
  • the present invention is applicable to a backlight device used as a light source of a liquid crystal display device of a mobile phone, PDA (Personal Digital Assistant), car navigation system, or the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

Une feuille prismatique asymétrique (15) présente sur sa surface une pluralité de protubérances (17) en forme de prisme. Chaque protubérance (17) comporte une première surface inclinée (17a) présentant une inclinaison relativement douce et une seconde surface inclinée (17b) présentant une inclinaison relativement abrupte. Un angle de base (17d) du côté de la seconde surface (17b) est dénoté a DEG et un angle de base (17c) du côté de la première surface (17a) est dénoté beta DEG . Lorsque la lumière pénètre dans la feuille prismatique asymétrique (15) présentant la structure décrite ci-dessus, à partir de la surface inférieure (15a) (plaque formant guide de lumière (11)), la lumière est principalement émise dans le sens sensiblement vertical (c'est-à-dire à un angle relativement faible par rapport au sens vertical) dans la première surface inclinée (17a) (flèches X) et est principalement émise selon un angle (c'est-à-dire un angle relativement important par rapport au sens vertical) dans la seconde surface inclinée (17b) (flèches Y).
PCT/IB2004/051456 2003-08-15 2004-08-13 Dispositif de retroeclairage Ceased WO2005017581A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2006523108A JP2007503007A (ja) 2003-08-15 2004-08-13 バックライト装置
US10/567,170 US20060250818A1 (en) 2004-08-13 2004-08-13 Backlight device
EP04769808A EP1664867A2 (fr) 2003-08-15 2004-08-13 Dispositif de retroeclairage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IBPCT/IB03/03682 2003-08-15
IB0303682 2003-08-15

Publications (2)

Publication Number Publication Date
WO2005017581A2 true WO2005017581A2 (fr) 2005-02-24
WO2005017581A3 WO2005017581A3 (fr) 2005-05-19

Family

ID=34179252

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/051456 Ceased WO2005017581A2 (fr) 2003-08-15 2004-08-13 Dispositif de retroeclairage

Country Status (6)

Country Link
EP (1) EP1664867A2 (fr)
JP (1) JP2007503007A (fr)
KR (1) KR20060066092A (fr)
CN (1) CN100414327C (fr)
TW (1) TW200528854A (fr)
WO (1) WO2005017581A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7852433B2 (en) 2007-10-24 2010-12-14 Lg Display Co., Ltd. Backlight assembly and display device having the same
EP3761073A4 (fr) * 2018-02-28 2021-04-21 LG Chem, Ltd. Film de compensation d'angle de visualisation, plaque de polarisation comprenant ce dernier et un dispositif d'affichage comprenant ce dernier

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US8858057B2 (en) 2012-06-28 2014-10-14 Shenzhen China Star Optoelectronics Technology Co., Ltd Asymmetric prism structure, light guide plate, backlight module, and application
CN104503011B (zh) * 2015-01-05 2017-08-11 京东方科技集团股份有限公司 棱镜膜片、曲面背光源和显示装置
CN104654132B (zh) * 2015-02-06 2017-05-31 安徽师范大学 一种限制液晶屏视角的背光模块
CN104791665B (zh) * 2015-04-23 2017-05-10 京东方科技集团股份有限公司 背光模组、显示装置以及扩散板
KR102682057B1 (ko) * 2016-09-09 2024-07-04 엘지디스플레이 주식회사 시야각 제어시트, 제조방법 및 이를 포함하는 표시장치
KR101940921B1 (ko) 2017-08-18 2019-01-22 주식회사 포스코 패턴글라스 및 이를 포함하는 태양광 발전모듈
EP3832361A4 (fr) * 2018-07-27 2021-09-29 Lg Chem, Ltd. Film de compensation d'angle optique et son procédé de fabrication, plaque de polarisation et son procédé de fabrication, et dispositif d'affichage comprenant une telle plaque de polarisation
TWI805464B (zh) 2022-04-28 2023-06-11 瑞儀光電股份有限公司 背光模組及顯示裝置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7852433B2 (en) 2007-10-24 2010-12-14 Lg Display Co., Ltd. Backlight assembly and display device having the same
EP3761073A4 (fr) * 2018-02-28 2021-04-21 LG Chem, Ltd. Film de compensation d'angle de visualisation, plaque de polarisation comprenant ce dernier et un dispositif d'affichage comprenant ce dernier
US11686967B2 (en) 2018-02-28 2023-06-27 Lg Chem, Ltd. Viewing angle compensation film, polarizing plate comprising same, and display device comprising same

Also Published As

Publication number Publication date
WO2005017581A3 (fr) 2005-05-19
JP2007503007A (ja) 2007-02-15
CN1836178A (zh) 2006-09-20
KR20060066092A (ko) 2006-06-15
TW200528854A (en) 2005-09-01
EP1664867A2 (fr) 2006-06-07
CN100414327C (zh) 2008-08-27

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