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WO2010055907A1 - Unité d’éclairage et dispositif d’éclairage utilisant cette unité - Google Patents

Unité d’éclairage et dispositif d’éclairage utilisant cette unité Download PDF

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Publication number
WO2010055907A1
WO2010055907A1 PCT/JP2009/069330 JP2009069330W WO2010055907A1 WO 2010055907 A1 WO2010055907 A1 WO 2010055907A1 JP 2009069330 W JP2009069330 W JP 2009069330W WO 2010055907 A1 WO2010055907 A1 WO 2010055907A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
light guide
guide plate
incident
exit surface
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/JP2009/069330
Other languages
English (en)
Japanese (ja)
Inventor
正 服部
健治 山下
秀知 崎山
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.)
NANO CREATE COMPANY Ltd
Kowa Co Ltd
Original Assignee
NANO CREATE COMPANY Ltd
Kowa 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 NANO CREATE COMPANY Ltd, Kowa Co Ltd filed Critical NANO CREATE COMPANY Ltd
Publication of WO2010055907A1 publication Critical patent/WO2010055907A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to an illumination unit including a light guide plate that propagates and emits visible light incident from an incident portion, and an illumination device using the illumination unit.
  • Conventional light guide plates are configured to take light from a light source disposed on a light incident surface of the light guide plate into the light guide plate and emit light perpendicular to the light incident surface, and as a surface light source device for a liquid crystal display screen Widely used.
  • a surface light source device for a liquid crystal display screen a method has been proposed in which a plurality of light sources are used to increase the amount of light incident on the light guide plate in order to obtain high luminance (see Patent Document 1 below).
  • a light guide plate that is thin in the emission direction has higher emission efficiency than a light guide plate that is thick in the emission direction. This is because the number of reflections of light in the light guide plate increases and the probability of reflection and diffusion in the reflection part (diffusion pattern) increases when a plurality of thin light guide plates are stacked and arranged rather than one thick light guide plate. This is because light is efficiently emitted from the light emission surface.
  • the LED as the light source cannot be said to have good light conversion efficiency.
  • the LED light emitting part is often made large and thick as necessary. In some cases, a light guide plate must be used.
  • Each light guide plate constituting the illumination unit is provided with a reflection portion (diffusion pattern) in order to efficiently emit light incident on the light guide plate.
  • This reflecting portion (diffusion pattern) is generally printed in white and is provided on the surface opposite to the exit surface of each light guide plate. Therefore, in the light guide plate closest to the exit surface of the laminated light guide plates, light can be efficiently emitted to the exit surface, but in other light guide plates, the light emitted in the exit direction is close to the exit surface of the light guide plate. It is shielded by the reflection part (diffusion pattern) of another light guide plate, and cannot be efficiently emitted to the emission surface.
  • the present invention has been made to solve such a problem, and an object thereof is to provide an illumination unit capable of efficiently emitting incident light to an exit surface and an illumination device using the illumination unit.
  • a light guide plate comprising: an incident part for entering light from a light source; and an exit surface for propagating and emitting the light incident from the incident part.
  • a reflector for reflecting visible light emitted from other than the exit surface of the light guide plate, and an illumination unit comprising:
  • the light guide plate is disposed on at least one of the light exit surface and the surface opposite to the light exit surface, or both so as to be dotted with a plurality of fine-shaped reflective portions formed in a convex shape or a concave shape. It is characterized by that.
  • the present invention is characterized by an illumination device comprising the illumination unit and a light source.
  • a plurality of fine-shaped reflecting portions formed in a convex shape or a concave shape are dotted on at least one of or both of the exit surface of the light guide plate and the surface opposite to the exit surface. Since the light is incident on the light guide plate from the light source, the light is reflected, refracted or scattered by the reflecting portion and efficiently guided to the exit surface, and the brightness of the light emitted from the exit surface can be increased.
  • the reflecting portions of the light guide plate are arranged so that the number per unit area gradually increases as the distance from the incident portion of the light guide plate increases, the luminance of the entire light exit surface of the light guide plate can be made substantially uniform.
  • FIG. 1 shows an embodiment of the lighting unit 1 of the present invention.
  • the illumination unit 1 includes a light guide plate 20 that includes an incident portion 20 a that makes visible light from the light source 13 incident thereon, an emission surface 20 b that propagates and emits visible light incident from the incident portion, and a light source 13.
  • the light guide plate 21 is provided with an incident portion 21a for allowing the visible light to enter, and an emission surface 21b for propagating the visible light incident from the incident portion and emitting the visible light toward the light guide plate 20.
  • the light source 13 is composed of, for example, a light emitting diode that emits visible light with high luminance and strong directivity.
  • the illumination unit 1 has a reflector for reflecting visible light emitted from other than the exit surface 20b of the light guide plate 20 having the exit surface of the illumination unit (that is, the uppermost layer).
  • the reflector includes a rear reflector 11 disposed opposite to a surface 21d opposite to the exit surface 21b of the light guide plate 21 that is stacked farthest from the exit surface of the illumination unit (that is, the lowermost layer), and the incident surface.
  • the end surface reflecting plate disposed opposite to the end surface other than the portion, that is, the end surface reflecting plate 12 disposed opposite to the end surface 20c other than the end surface where the light source 13 is disposed intersects with the end surface where the light source 13 is disposed.
  • the incident portion reflector 10 is disposed on the light source 13 side so as not to prevent light incidence from the light source.
  • any one of the back reflector 11, the end reflector 12, the incident reflector 10, and the side reflectors (14, 15), any two, any three, or any These four may be used.
  • the light guide plates 20 and 21 are made of a highly light-transmitting material, for example, a transparent acrylic resin. On the surfaces 20d and 21d on the opposite side of the emission surfaces 20b and 21b, the concave fine-shaped reflecting portions 20e and A plurality of 21e are arranged.
  • FIG. 3 shows this reflection part in detail, and the light guide plate 20 in which fine reflection parts 20e are arranged in a grid pattern is formed by injection molding using a mold.
  • the thickness of the light guide plate 20 is 1 mm (dot density is about 15000 pieces / cm 2 ), and as shown in an enlarged view in FIG. 3, the larger diameter d1 is about 55 ⁇ m and the smaller diameter is It is formed in a truncated cone shape with d2 of about 10 ⁇ m and height d3 of about 30 ⁇ m.
  • FIG. 3 is shown for ease of understanding and does not match the actual scale.
  • Such reflection portions 20e and 21e may be arranged uniformly on the end surfaces 20d and 21d of the light guide plates 20 and 21, but as shown in FIG. 1, the unit increases as the distance from the incidence portions 20a and 21a of the light guide plate increases. It arrange
  • the arrangement of the reflection portions 20 e of the light guide plate provides a matrix-like reflection portion pattern.
  • 21 has the same reflecting portion pattern.
  • the reflecting portions 20e and 21e are arranged in the vertical alignment with the upper and lower light guide plates 20 and 21, respectively.
  • the reflection portion patterns formed on the light guide plates 20 and 21 can be different patterns.
  • FIG. 1 illustrates various ray paths. This ray path is qualitatively illustrated to facilitate understanding of the present invention, and does not necessarily follow the laws of optics.
  • Light incident on the light guide plates 20 and 21 is reflected, refracted, or scattered in multiple ways by the reflecting plates 10, 11 and 12, the surfaces 20 a to 20 d and 21 a to 21 d of the light guide plates 20 and 21, or the reflecting portions 20 e and 21 e.
  • the light is emitted to the outside through the light emission surface 20b of the uppermost light guide plate 20.
  • the light beam L1 is repeatedly reflected on the upper and lower surfaces of the lower light guide plate 21, and then enters the air layer of the reflection portion 20e of the upper light guide plate 20, and refracts the upper light guide plate 20 to be emitted to the outside.
  • the light beam L2 passes through the upper light guide plate 20 and is emitted to the outside without passing through the reflecting portions 20e and 21e from the lower light guide plate 21.
  • the light beam L3 collides with the inclined surface of the reflecting portion 20e of the light guide plate 20, and is reflected, refracted, or scattered and guided to the exit surface side.
  • incident light is also reflected by the side reflectors (14, 15), and the reflected light is repeatedly reflected, refracted, and scattered in the same manner as the light beams L1 to L3.
  • the light incident on the light guide plate propagates through the light guide plate while being repeatedly reflected, refracted or scattered in various paths, and light having high luminance is emitted from the light exit surface 20b of the light guide plate 20 above.
  • FIG. 2 shows an embodiment of a conventional light guide plate, which shows an illumination unit in which a light guide plate 30 in which a number of fine reflecting portions (scattering portions) 30a are printed on a surface opposite to an emission surface is printed with a white paint.
  • a part of the light emitted from the lower light guide plate 30 is reflected by the reflecting portion 30a of the upper light guide plate 30 and is not guided to the upper light guide plate. As in the configuration of FIG. 1, it is impossible to emit high-luminance light.
  • FIGS. 4a and 4b illustrates an illumination unit having a single light guide plate 20 and FIG. 4b illustrates three light guide plates 20, 21. , 22 and the thickness of the laminate is the same as the thickness of one light guide plate in FIG. 4a.
  • the light guide plate 22 is different from the thickness of the light guide plate 20 in FIG. It is the same as 21. As can be seen from FIG. 4b, when a plurality of light guide plates are arranged in a stacked manner, the number of times of light reflection within the light guide plate increases, and light is efficiently emitted from the light exit surface.
  • a light guide plate having a high emission efficiency can be obtained with the light guide plate itself having a plurality of fine-shaped reflection portions 20 e interspersed. Therefore, as shown in FIG. It can also be configured with only one light guide plate.
  • FIG. 5 shows two average luminance values, which are changed according to the number of laminated light guide plates, as measured values and simulation values. From this figure, it can be seen that the average luminance value increases as the number of light guide plates is increased.
  • the shape of the reflecting portion 20e formed on the light guide plate 20 is a truncated cone shape.
  • This effect is shown in FIG. 6b compared to a cylindrical reflector.
  • FIG. 6b when the reflecting portion is cylindrical, only about 8% of the total luminance is obtained at a viewing angle of ⁇ 20 °, whereas as shown in FIG. 6a, a truncated cone shape is obtained. Then, it can be seen that illumination of about 80% of the overall luminance is obtained at a viewing angle of ⁇ 20 °, and illumination with high emission efficiency can be obtained even when compared with the standard of about 40% in the liquid crystal backlight.
  • the reflecting portion can be not only a truncated cone shape, but also a cone shape having an inclined portion, a pyramid shape, a truncated pyramid shape, or a spherical shape.
  • the reflecting portions 20e of the light guide plate 20 are arranged so that the number per unit area gradually increases as the distance from the incident portion 20a of the light guide plate increases. This state is illustrated in FIGS. 7a and 7b.
  • the brightness of the light emitted from the opposite surface 20c facing the light source 13 is increased in the vicinity of the incident portion 20a on the light source 13 side. Therefore, with one reflecting portion 20e as one dot, the dot density per area of D1 (88 mm) ⁇ D2 (48 mm) is reduced in the high luminance area (near the light source) shown in FIG.
  • the dot density is increased as it goes to the other side.
  • FIG. 8a shows the sum of the energy emitted from the exit surface due to the increase in the number of light guide plates in the illumination unit according to the present invention, the average value thereof, the output efficiency which is the ratio of the incident energy and the total output energy, and the total number of dots accompanying the increase in the number of light guide plates.
  • FIG. 8b shows the change in the total output energy with the increase in the total number of dots
  • FIG. 8c shows the change in the exit surface light flux with the increase in the total number of dots
  • FIG. 8d shows the change in the average luminance with the increase in the total number of dots.
  • the numerical values are simulated values with a viewing angle of ⁇ 20 ° and a vertical and horizontal size of the light guide plate of 30 mm ⁇ 30 mm.
  • FIG. 9 is a diagram illustrating the spectral characteristics of the light guide plate 20, where 41 is when light is incident from the surface (bottom surface) on which the reflecting portion is formed, and 42 is when light is incident from the opposite surface (upper surface) of the reflecting portion.
  • the transmittance when entering from the reflecting portion surface is slightly higher than the transmittance when entering from the opposite surface of the reflecting portion, but each has a substantially constant high transmittance from a wavelength of about 420 nm or more. Show.
  • FIG. 10 the same members as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • two light guide plates 40 and 41 made of the same material and similarly configured are stacked on the illumination unit 1.
  • the light guide plates 40 and 41 are respectively incident portions 40a and 41a for allowing visible light from the light source 13 to enter, end faces 40c and 41c facing the incident portions, exit-side surfaces 40b and 41b for emitting visible light, and the exit surfaces. And opposite surfaces 40d and 41c.
  • the light guide plates 40 and 41 are arranged with a plurality of convex fine reflection portions 40 e and 41 e scattered on the exit-side surfaces 40 b and 41 b.
  • FIG. 11 shows the shape and arrangement pattern of the reflecting portion 40e formed on the light guide plate 40.
  • the reflecting portion 40e has a convex shape obtained by turning the reflecting portion 20e in FIG. 3 upside down, that is, a truncated cone shape, and the dimensions d1, d2, and d3 are the same as those in FIG.
  • the thickness of the light guide plate 40 and the reflection portion pattern are the same as those in FIG. In FIG. 11, the upper part is the emission surface 40b.
  • the light guide plate 41 also has the same thickness and reflection part pattern as the light guide plate 40, and is laminated so that the light guide plates 40 and 41 are in contact with each other and a predetermined air layer is formed between the light guide plates 40 and 41.
  • the illumination unit composed of the light guide plates 40 and 41 also emits uniform and high-intensity illumination light from the exit surface 40b of the upper light guide plate 40, and the same effect as the illumination unit of FIG. 1 is obtained. It is done.
  • the convex or concave fine reflecting portion can be provided on the exit side surface (upper surface) and / or the surface opposite to the exit side surface (bottom surface), and an example thereof is shown in FIGS. 12h.
  • FIG. 12a shows the light guide plate 100 in which the concave reflecting portion 100a is arranged on the bottom surface, and corresponds to the light guide plates 20 and 21 in FIG.
  • FIG. 12B shows a light guide plate 101 having a convex reflecting portion 101a disposed on the upper surface, and corresponds to the light guide plates 40 and 41 shown in FIG.
  • FIG. 12c shows the light guide plate 102 with the convex reflection portion 102a arranged on the bottom surface
  • FIG. 12d shows the light guide plate 103 with the concave reflection portion 103a arranged on the top surface.
  • the convex or concave reflecting portions can be provided not only on one side of the light guide plate but also on both the top and bottom surfaces.
  • 12e shows the light guide plate 104 with the convex reflecting portion 104a on the top surface and the concave reflecting portion 104b on the bottom surface
  • FIG. 12f shows the concave reflecting portion 105a on the top surface and the concave reflecting portion 105b on the bottom surface
  • FIG. 12g shows the light guide plate 106 with the concave reflecting portion 106a on the top surface and the convex reflecting portion 106b on the bottom surface
  • FIG. 12h shows the convex reflecting portion 107a with the convex reflecting portion 107a on the top surface.
  • a light guide plate 107 in which the portion 107b is disposed on the bottom surface is shown.
  • FIG. 13 shows the lighting unit 1 in which the three light guide plates 20 described above are stacked and the reflectors 11, 12, 10, 14, and 15 are attached to the bottom surface, the end surface opposite to the incident portion, the incident side end surface, and the side surfaces, respectively.
  • a surface light emitting device to which a light source 13 composed of a high-intensity light emitting diode is attached is used as an illumination device will be described.
  • the illumination unit emits high-luminance light uniformly from the emission surface 20b. At this time, light is effectively prevented from leaking from the end surface other than the exit surface 20b of the illumination unit due to the reflection of the light by the reflectors 11, 12, 10, 14, and 15 of the illumination unit. Can do.
  • the light source 13 has been described using a visible light LED.
  • the lighting unit and the lighting device of the present invention are not limited to the visible light LED, for example, an ultraviolet light LED that emits ultraviolet light, or a red light that emits infrared light. Use of the external light LED as the light source 13 is not prevented.
  • the shape of the light guide plate is described using a quadrangle, but it is needless to say that a polygonal lighting unit can be used.
  • the light source incident portion is described as one place. However, even an illumination unit having a large number of light source incident portions does not hinder the effects of the present invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

Selon l’invention, des plaques réfléchissantes (11, 12, 10, 14, 15) sont fixées à une plaque de guide de lumière (20) comprenant une partie d’incidence de la lumière (20a) où entre la lumière visible provenant d’une source de lumière (13), et une surface de sortie de lumière (20b) qui propage la lumière visible entrant dans la partie d’incidence de lumière et émet cette lumière. De minuscules parties réfléchissantes concaves (20e) sont disposées en de nombreux points sur la surface opposée (20d) de la plaque de guide de lumière par rapport à la surface de sortie de lumière (20b). Grâce à cette configuration, la lumière pénétrant dans la plaque de guide de lumière depuis la source de lumière est réfléchie et réfractée ou diffusée, et est efficacement guidée vers la surface de sortie de lumière par les parties réfléchissantes, et la luminance de la lumière sortant de la surface de sortie de lumière peut ainsi être améliorée.
PCT/JP2009/069330 2008-11-17 2009-11-13 Unité d’éclairage et dispositif d’éclairage utilisant cette unité Ceased WO2010055907A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008293752A JP2010123295A (ja) 2008-11-17 2008-11-17 照明ユニットと同ユニットを用いた照明装置
JP2008-293752 2008-11-17

Publications (1)

Publication Number Publication Date
WO2010055907A1 true WO2010055907A1 (fr) 2010-05-20

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EP3985304A1 (fr) * 2020-10-16 2022-04-20 Ningbo Geely Automobile Research & Development Co. Ltd. Système de lentille optique pour des applications d'éclairage de véhicule
EP4160086A1 (fr) * 2021-09-29 2023-04-05 LG Display Co., Ltd. Dispositif d'affichage

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CN103299236A (zh) * 2010-11-10 2013-09-11 Lg伊诺特有限公司 背光单元
KR101780420B1 (ko) * 2011-03-24 2017-09-22 삼성디스플레이 주식회사 백라이트 유닛 및 이를 구비하는 입체 영상 표시 장치
KR101839335B1 (ko) * 2011-12-14 2018-03-19 엘지디스플레이 주식회사 백 라이트 유닛 및 이를 이용한 액정 표시장치
JP5747935B2 (ja) * 2013-04-09 2015-07-15 株式会社栗原工業 Ｌｅｄ照明装置
CN104834046A (zh) * 2015-05-05 2015-08-12 武汉华星光电技术有限公司 背光单元及照明设备
KR101863646B1 (ko) * 2017-02-06 2018-06-04 김광원 도광판을 이용한 조명장치
JP7282496B2 (ja) * 2017-10-06 2023-05-29 デクセリアルズ株式会社 光学体、光学体の製造方法、発光装置及び遊戯機器用表示装置

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JP2005056711A (ja) * 2003-08-05 2005-03-03 Nippon Leiz Co Ltd 導光板ユニットならびに平面照明装置

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JPH10227918A (ja) * 1997-02-18 1998-08-25 Copal Co Ltd 面発光装置の導光部材
JP2002236218A (ja) * 2001-02-09 2002-08-23 Omron Corp 導光板体、面光源装置、画像表示装置、携帯電話、および情報端末
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JP2005056711A (ja) * 2003-08-05 2005-03-03 Nippon Leiz Co Ltd 導光板ユニットならびに平面照明装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3985304A1 (fr) * 2020-10-16 2022-04-20 Ningbo Geely Automobile Research & Development Co. Ltd. Système de lentille optique pour des applications d'éclairage de véhicule
US11879613B2 (en) 2020-10-16 2024-01-23 Ningbo Geely Automobile Research & Dev. Co., Ltd. Optical lens system for vehicle lighting applications
EP4160086A1 (fr) * 2021-09-29 2023-04-05 LG Display Co., Ltd. Dispositif d'affichage
US11640025B2 (en) 2021-09-29 2023-05-02 Lg Display Co., Ltd. Display device having a private mode and a sharing mode
US11977252B2 (en) 2021-09-29 2024-05-07 Lg Display Co., Ltd. Display device including a light guide plate with protrusions

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