WO2010038508A1 - 照明装置および液晶表示装置 - Google Patents
照明装置および液晶表示装置 Download PDFInfo
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- WO2010038508A1 WO2010038508A1 PCT/JP2009/059594 JP2009059594W WO2010038508A1 WO 2010038508 A1 WO2010038508 A1 WO 2010038508A1 JP 2009059594 W JP2009059594 W JP 2009059594W WO 2010038508 A1 WO2010038508 A1 WO 2010038508A1
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- light
- light guide
- liquid crystal
- crystal display
- light source
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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- 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
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
Definitions
- the present invention relates to an illumination device used as a backlight of a liquid crystal display device, and a liquid crystal display device including the illumination device.
- Liquid crystal display devices are widely used in liquid crystal televisions, monitors, mobile phones, etc., taking advantage of energy saving, thinness and light weight. As a method for further utilizing these features, there is an improvement of a so-called backlight that is disposed behind the liquid crystal display device.
- Lighting devices are mainly classified into side light type (also called edge light type) and direct type.
- the side light type has a configuration in which a light guide is provided behind the liquid crystal display panel, and a light source is provided at the lateral end of the light guide. The light emitted from the light source is reflected by the light guide and indirectly irradiates the liquid crystal display panel indirectly.
- sidelight type lighting devices are mainly employed in small and medium liquid crystal displays such as mobile phones and notebook personal computers.
- Patent Document 1 discloses a surface light emitting device in which a plurality of dots are formed on a reflection surface of a light guide plate so that uniform light emission from a light emitting surface is possible.
- the corners of the reflecting surface become dark because light is not transmitted due to the directivity of the light source, so the density of dots at the corners is made higher than that of the other parts.
- the direct type lighting device arranges a plurality of light sources behind the liquid crystal display panel and directly irradiates the liquid crystal display panel. Therefore, it is easy to obtain high brightness even on a large screen, and it is mainly used in large liquid crystal displays of 20 inches or more.
- the current direct type illumination device has a thickness of about 20 mm to 40 mm, which is an obstacle to further thinning the display.
- Aiming for further thinning with large liquid crystal displays can be solved by shortening the distance between the light source and the liquid crystal display panel, but in that case, if the number of light sources is not increased, the luminance uniformity in the lighting device can be obtained. I can't. On the other hand, increasing the number of light sources increases the cost. Therefore, it is desired to develop a lighting device that is thin and excellent in luminance uniformity without increasing the number of light sources.
- Patent Document 2 proposes a surface light source device that can be suitably used for a large liquid crystal display because a wide light-emitting area can be secured with a compact structure.
- This surface light source device has a tandem structure including primary light sources in which plate-like light guide blocks are arranged in tandem and primary light is supplied to each light guide block.
- an illuminating device in which a plurality of light emitting units configured by combining a light source and a light guide are arranged in tandem is called a tandem type illuminating device.
- Patent Document 2 discloses a tandem surface light source device in which a plurality of tandem light guide-light emitting mechanisms are arranged in parallel. As a result, the light guide block and the light sources that supply the primary light to each light guide block are arranged vertically and horizontally, and it is possible to provide a tandem surface light source device having a very large light emitting area.
- Japanese Patent Publication Japanese Patent Laid-Open No. 2003-43266 (Publication Date: February 13, 2003)” Japanese Patent Publication “Japanese Patent Laid-Open No. 11-288611 (Publication Date: October 19, 1999)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2007-206398 (Publication Date: August 16, 2007)”
- Patent Document 3 discloses a technique for mitigating a decrease in luminance following the boundary of each light guide block in a direct type planar light source device in which a plurality of light guide blocks are combined.
- this apparatus it is necessary to process the shape of the light guide block in a complicated manner. Therefore, it is impossible to keep the luminance uniformity by using the conventional light guide as it is.
- an object of the present invention is to provide an illuminating device capable of improving luminance uniformity in an illuminating device including a plurality of light guides. There is.
- an illumination device includes a light source, a plurality of light guides that emit light from the light source, and a reflective member, and the reflective member includes the light guide.
- the first light guide and the second light guide are adjacent to each other among the plurality of light guides.
- a protruding portion having a curved surface is provided in the region between the first light guide and the second light guide in the projection in the normal direction of the light emitting surface of the surface of the reflecting member facing the light guide.
- part of the light emitted between the first light guide and the second light guide adjacent to each other enters the reflecting member and causes light scattering.
- the light incident on the curved surface of the protruding portion provided on the reflecting member changes the direction of emission, and the amount of light returning to the inside of the light guide again decreases.
- emitted from the light emission surface of a light guide increases. Therefore, the luminance between adjacent light guides increases, and the occurrence of luminance unevenness due to the darkness of the center between adjacent light guides can be suppressed. Thereby, the illuminating device which improved the brightness uniformity more is realizable.
- the projection In the projection in the normal direction of the light emitting surface, the projection is provided in the region between the light guide and the light guide.
- the projection is entirely formed of the light guide and the light guide in the projection. It is intended to include not only those located between the two, but also those in which a part of the protrusion is located between the light guide and the light guide.
- the first light guide and the second light guide are in a direction perpendicular to the optical axis direction of the light emitted from the light source and parallel to the light emitting surface. Are adjacent to each other.
- the projecting portion having a curved surface is formed on the reflecting member between the light guides adjacent to each other in the direction perpendicular to the optical axis direction and parallel to the light emitting surface. Since it is provided, a decrease in luminance in this region can be suppressed. Therefore, in a region where the degree of luminance decrease is large, the luminance uniformity can be improved more effectively because the luminance reduction is prevented.
- the direction of the optical axis of the light emitted from the light source means the direction of the main component of the light emitted from the light source with directivity (directional direction).
- the light emitted from the light source and incident on the light guide is mainly referred to as a direction in which light is guided (light guide direction).
- the surface of the protruding portion is preferably a curved surface.
- the protrusion is a belt-like protrusion that extends in parallel with the optical axis direction of the light emitted from the light source.
- the contour line in the cross section orthogonal to the optical axis direction of the light emitted from the light source is an arc.
- the lighting device according to the present invention may have a configuration in which a plurality of the protruding portions are provided.
- the degree of light scattering can be adjusted by adjusting the number of protrusions to be formed. Therefore, it is possible to adjust the degree of increase in luminance according to the degree of decrease in luminance between the light guides, and to effectively improve luminance uniformity.
- a gap is formed between the light guide and the reflecting member.
- liquid crystal display device is characterized in that the illumination device having any one of the configurations of the present invention is provided as a backlight.
- a television device is characterized by including the liquid crystal display device of the present invention.
- FIG. 3 is a cross-sectional view of the backlight showing a state cut along a cutting line A-A ′ in FIG. 2, and schematically showing the traveling direction of light. It is sectional drawing of the backlight in another embodiment of this invention, and is a figure which shows typically the advancing direction of light. It is sectional drawing of the backlight in another embodiment of this invention, and is a figure which shows typically the advancing direction of light. It is a perspective view of the reflecting material in another embodiment of the present invention.
- FIG. 9 is a diagram showing a conventional backlight, (a) is a top view, and (b) is a cross-sectional view taken along the cutting line BB ′, schematically showing the traveling direction of light.
- FIG. It is a disassembled perspective view which shows the structure of the television apparatus in one Embodiment of this invention.
- FIG. 1 is a cross-sectional view showing a schematic configuration of a liquid crystal display device 1 according to the present embodiment.
- the liquid crystal display device 1 includes a backlight 2 (illumination device) and a liquid crystal display panel 3 disposed to face the backlight 2.
- the liquid crystal display panel 3 is the same as a general liquid crystal display panel used in a conventional liquid crystal display device, and although not shown, for example, an active matrix substrate on which a plurality of TFTs (thin film transistors) are formed, and a liquid crystal display panel 3 is opposed thereto. And a liquid crystal layer sealed between the substrates by a sealing material.
- TFTs thin film transistors
- the backlight 2 is disposed behind the liquid crystal display panel 3 (on the side opposite to the display surface).
- the backlight 2 includes a light source 5 (not shown), a reflective material 6 (reflective member), a light guide 7, a diffusion plate 8, an optical sheet 9, and a transparent plate 10.
- the light guide which comprises the backlight 2 is comprised by at least 2 or more.
- a backlight 2 in which two light guides 7 and 17 are arranged in parallel will be described. Unless otherwise specified, one light guide 7 will be described as an example as a representative of both light guides 7 and 17. 1 to 5 showing this embodiment, the size of each member and the distance between the light guide 7 and the light guide 17 are exaggerated for convenience of explanation.
- FIG. 2 is a top view of the backlight 2 as viewed from the top surface (the side on which the liquid crystal display panel is disposed), and the diffusion plate 8, the optical sheet 9, and the transparent plate 10 are not shown for convenience of explanation.
- the light source 5 is disposed to face one surface of the light guide 7.
- the protruding portion 20 is provided so as to extend in a band shape in the normal direction of the surface of the light guide body 7 on which the light source 5 is disposed to face the light source 5, that is, in the optical axis direction.
- the light source 5 is, for example, a side light emitting type light emitting diode (LED), a cold cathode tube (CCFL), or the like. In the present embodiment, the light source 5 will be described using an LED as an example. By using a side light emitting type LED in which R, G, and B chips are molded in one package as the light source 5, it is possible to obtain an illumination device with a wide color reproduction range.
- the light source 5 is disposed on a substrate (not shown).
- the light guide 7 emits light emitted from the light source 5 from a light emitting surface (also referred to as a light emitting surface) 7a.
- the light emitting surface 7a is a surface for irradiating the irradiation target with light.
- the light emitting surface 7a of the light guide 7 or the back surface thereof is processed and processed to emit light that has been guided to the front, and the light is transmitted from the light emitting surface 7a of the light guide 7 to the liquid crystal display panel. 3 side is emitted.
- Specific processing methods and processing methods applied to the light guide portion of the light guide 7 include, for example, prism processing, embossing processing, printing processing, and the like, but are not particularly limited, and known methods are used as appropriate. .
- the light guide 7 is mainly composed of a transparent resin such as polycarbonate (PC) and polymethyl methacrylate (PMMA), but is not particularly limited and is preferably made of a material having high light transmittance.
- the light guide 7 can be formed by, for example, injection molding, extrusion molding, hot press molding, cutting, or the like. However, it is not limited to these shaping
- the reflector 6 forms a gap with the light guide 7 so as to face the back surface of the light guide 7 (the surface opposite to the light emitting surface 7a), that is, with a predetermined interval. Has been placed.
- the reflecting material 6 reflects light emitted from the light guide 7 toward the reflecting material 6 and emits more light from the light emitting surface 7a.
- the reflective material 6 is formed of a resin such as foamed PET (polyethylene terephthalate), PC (polycarbonate), and PS (polystyrene), and a metal thin film having a high reflectance such as silver and aluminum is deposited on the surface thereof.
- the material of the reflecting material 6 is not limited to the above, and any material can be used as long as the shape can be maintained after the reflecting material 6 is formed, but foamed PET is preferable.
- the reflective material 6 can be molded by, for example, injection molding, extrusion molding, hot press molding, cutting, or the like.
- the reflective material 6 is subjected to a surface treatment such as forming a fine unevenness to form a mat. Thereby, the reflecting material 6 can scatter light incident on the reflecting material 6.
- the diffusion plate 8 is disposed to face the light emitting surface 7a so as to cover the entire flush light emitting surface formed by the light emitting surfaces 7a of the light guides 7 and 17.
- the diffusion plate 8 diffuses the light emitted from the light emitting surface 7 a of the light guide 7 and irradiates the optical sheet 9.
- the optical sheet 9 is composed of a plurality of sheets arranged in an overlapping manner, and uniformizes and collects the light emitted from the light emitting surface 7 a of the light guide 7 and irradiates the liquid crystal display panel 3. . That is, the optical sheet 9 reflects a diffusion sheet that collects and scatters light, a lens sheet that collects light and improves luminance in the front direction (the direction of the liquid crystal display panel), and one polarization component of the light. For example, a polarizing reflection sheet that improves the luminance of the liquid crystal display device 1 by transmitting the other polarization component can be used. These are preferably used in appropriate combination depending on the price and performance of the liquid crystal display device 1.
- the transparent plate 10 is used when the distance between the light guide 7 and the diffusion plate 8 is kept constant, and forms a light diffusion region.
- the transparent plate 10 is formed of a light transmissive material such as a polyethylene film.
- the transparent plate 10 may be omitted, and the light guide 7 and the diffusion plate 8 may be arranged to face each other.
- the light emitted from the light source 5 propagates through the light guide 7 while receiving the scattering action and the reflection action, is emitted from the light emitting surface 7a, and passes through the diffusion plate 8 and the optical sheet 9.
- the liquid crystal display panel 3 is reached.
- FIG. 8A and 8B are diagrams showing a conventional backlight 102
- FIG. 8A is a top view of the backlight 102
- FIG. 8B is a section line B- in FIG. 8A. It is the partial arrow directional cross-sectional view which showed the state cut
- illustration of members other than the light source, the light guide, and the reflecting material is omitted.
- the conventional backlight 102 most of the light incident from the light source 105 is guided in a direction parallel to the normal direction of the irradiation surface of the light source 105 inside the light guide 107 (hereinafter also referred to as an optical axis direction). 8 (direction of solid line arrow in (a)). For this reason, the amount of light guided in the direction perpendicular to the optical axis direction and parallel to the light emitting surface of the light guide 107 (the direction of the dashed arrow in FIG. 8A) is relatively small. . Therefore, the amount of light emitted to the region S100 between the light guide 107 and the light guide 117 is small, and the luminance is reduced in the region S100. As a result, the luminance of the backlight 102 becomes nonuniform.
- the backlight 102 is provided with the reflector 106 not only in the region facing the light guide 107 but also in the region corresponding to the space between the light guide 107 and the light guide 117. ing. As shown in FIG. 8B, in this case, part of the light emitted from the side surfaces 107b and 117b of the light guides 107 and 117 is reflected on the surface of the reflector 106 in the direction of the liquid crystal display panel. . For this reason, the luminance of the region S100 is increased, and the occurrence of luminance unevenness can be suppressed. As a result, the decrease in the luminance uniformity of the backlight 102 can be suppressed.
- the reflector 106 when the reflector 106 is provided as shown in FIG. 8B, the light is totally reflected at the reflector 106 at a predetermined reflection angle corresponding to each incident angle. Therefore, a lot of light emitted from one light guide is totally reflected by the reflector 106 and enters the other light guide. Therefore, the amount of light reflected in the direction of the liquid crystal display panel is very small, and even if the reflector 106 is provided as shown in FIG. It is enough.
- the region between the light guide 7 and the light guide 17 in the projection in the normal direction of the light emitting surface 7a on the surface of the reflector 6 on the side facing the light guide 7 By providing the protruding portion 20 having a curved surface on the “reflecting material corresponding to the region between the light guide and the light guide”, a reduction in luminance uniformity is suppressed. .
- FIG. 3 is a partial cross-sectional view of the backlight 2 showing a state cut along the cutting line A-A ′ of FIG. Further, in FIG. 3, the traveling direction of light is indicated by an arrow.
- FIG. 7 is a diagram showing the direction of the emitted light.
- FIG. 7A shows a case where a conventional reflector having no protrusion is used
- FIG. 7B shows a protrusion.
- the light that is emitted most strongly with respect to the incident light is represented by a thick arrow.
- the emission direction of the strongest outgoing light changes, and the strongest outgoing light can be supplied more to the liquid crystal display panel 3 from between the light guides. it can.
- luminance between the light guide 7 and the light guide 17 can be raised more, and the backlight 2 which the brightness
- the protrusion 20 is a belt-like protrusion extending in a direction parallel to the optical axis direction, and the outline of the protrusion 20 in a cross section orthogonal to the optical axis direction is an arc. It has become. Since the protruding portion 20 is continuously provided in a band shape from one end portion to the other end portion of the reflective material 6, the luminance is increased in the entire region sandwiched between the light guide body 7 and the light guide body 17. Can be prevented.
- the shape of the protrusion part 20 is not limited to what is shown in FIG. 3, It can also deform
- FIG. 4 is a cross-sectional view showing another form of the protrusion 20.
- the protrusion 20 shown in FIG. 4 has a shape in which four belt-like protrusions that are shorter in width and lower in height than the belt-like protrusion shown in FIG. 3 are arranged in parallel. Even in this case, the same effect as that of the protruding portion 20 having the configuration shown in FIG. 3 can be obtained.
- the degree of light scattering can be changed and the degree of increase in luminance can be adjusted.
- the protruding portion 20 has a strip shape, but is not limited to the strip shape, and may have another structure.
- FIG. 6 is a perspective view of the reflector 6 representing still another form of the protrusion 20.
- the protrusion 20 may have a protrusion-like structure.
- the protruding protrusions are arranged so as to form a belt shape as a whole.
- the protruding portion 20 only needs to have a curved surface on the side where the light guide 7 is disposed, and the back surface thereof (the side where the light guide 7 and the liquid crystal display panel 3 and the like are not disposed, hereinafter,
- the structure of “the back side of the reflector” is not particularly limited.
- a part of the plate-like reflecting material is curved to form the protruding portion 20, and when viewed from the back side surface of the reflecting material 6, a cross section It has the structure where the groove
- FIG. 5 is a cross-sectional view showing another form of the projecting portion 20, and as shown in FIG. 5, the back side surface of the reflector 6 may be flat.
- the reflective material 6 having the protruding portion 20 can be manufactured by, for example, processing a mold itself for forming the reflective material 6 and performing injection molding using the mold. That is, in order to provide the protrusion part 20, another material and another process are not required. Therefore, the present invention does not require a new process for providing a new material with higher reflection efficiency and a region with higher reflection efficiency in order to prevent the occurrence of luminance unevenness, and can easily suppress the occurrence of luminance unevenness. It is excellent in that it can be done.
- the entire contour line is preferably a curved line.
- the shape of the contour include, but are not limited to, an arc, a curve of a polynomial having a quadratic or higher order, and a sine curve.
- the protrusion part 20 is formed only in the area
- the projecting portion that does not include a portion overlapping the region between the light guide 7 and the light guide 17 is not formed on the reflector 6.
- the distance W2 of the protrusion 20 in the direction perpendicular to the optical axis direction and the normal direction of the light emitting surface 7a is the light guide 7. Even when the distance W1 is greater than the distance W1, the light guide 7 and the reflector 6 can be suitably arranged. When the distance W2 of the protrusion 20 is smaller than the distance W1 between the light guides, the gap S11 may not be formed.
- the lighting device of the present invention is excellent in luminance uniformity when a plurality of light guides are arranged to increase the light emitting area. Therefore, it is particularly preferable to use as a backlight of a liquid crystal display device having a large screen, but the present invention is not limited to this and can be used as a backlight of any liquid crystal display device.
- the protruding portion having a curved surface is provided on the surface of the reflecting member facing the light guide. ing. Therefore, there is an effect that it is possible to realize an illuminating device in which occurrence of luminance unevenness is suppressed and luminance uniformity is improved.
- the liquid crystal display device of the present invention includes the illumination device of the present invention as a backlight. Therefore, there is an effect that a liquid crystal display device excellent in luminance uniformity can be realized.
- a television device 30 to which the liquid crystal display device 1 of the present invention is applied will be described.
- the tuner unit receives a television broadcast and outputs a video signal
- the liquid crystal display device 1 performs video display based on the video signal output from the tuner unit.
- FIG. 9 is an exploded perspective view of the television device 30 using the liquid crystal display device 1.
- the television device 30 has a configuration in which the liquid crystal display device 1 is sandwiched between a first housing 31 and a second housing 32.
- the first housing 31 is formed with an opening 31 a that transmits an image displayed on the liquid crystal display device 1.
- the second casing 32 covers the back side of the liquid crystal display device 1, and is provided with an operation circuit 33 for operating the liquid crystal display device 1, and a support member 34 is attached below. Yes.
- the television device 30 since the television device 30 is equipped with the liquid crystal display device 1 including the backlight 2, it can display an image with excellent luminance uniformity when displaying a television broadcast image.
- the illumination device of the present invention can be used as a backlight of a liquid crystal display device.
- Liquid crystal display device 2 Backlight (lighting device) 3 Liquid crystal display panel 5 Light source 6 Reflective member (reflective material) 7, 17 Light guide 7a Light emission surface 7b Side 8 Diffuser 9 Optical sheet 10 Transparent plate 20 Projection 102 Back light 105 Light source 106 Reflector 107, 117 Light guide 107b, 117b Side
Abstract
Description
本実施の形態では、液晶表示装置のバックライトとして使用される照明装置について説明する。
ここで、輝度が不均一となる原理について説明する。
次に、反射材6に設けられている突出部20について説明する。
バックライト2には、図3に示すように、導光体7と反射材6との間に、間隙S11が形成されている。
2 バックライト(照明装置)
3 液晶表示パネル
5 光源
6 反射部材(反射材)
7,17 導光体
7a 発光面
7b 側面
8 拡散板
9 光学シート
10 透明板
20 突出部
102 バックライト
105 光源
106 反射材
107,117 導光体
107b,117b 側面
Claims (9)
- 光源と、該光源から入射した光を面発光させる複数の導光体と、反射部材とを備え、
上記反射部材が、上記複数の導光体の発光面の反対側の面と対向する位置に配設されている照明装置において、
上記複数の導光体のうち、第1の導光体および第2の導光体は互いに隣り合っており、
上記反射部材の、上記導光体と対向する側の面の、上記発光面の法線方向の投影における第1の導光体と第2の導光体との間の領域に、曲面を有する突出部が設けられていることを特徴とする照明装置。 - 第1の導光体および第2の導光体は、上記光源からの出射光の光軸方向に垂直な方向であって、かつ、上記発光面と平行な方向に互いに隣り合っていることを特徴とする請求項1に記載の照明装置。
- 上記突出部の表面は曲面からなることを特徴とする請求項1または2に記載の照明装置。
- 上記突出部は、上記光源からの出射光の光軸方向と平行に延びる帯状突出部であることを特徴とする請求項1から3までの何れか1項に記載の照明装置。
- 上記突出部は、上記光源からの出射光の光軸方向と直交する断面における輪郭線が円弧であることを特徴とする請求項1から4までの何れか1項に記載の照明装置。
- 上記突出部が複数設けられていることを特徴とする請求項1から5までの何れか1項に記載の照明装置。
- 上記導光体と上記反射部材との間には、間隙が形成されていることを特徴とする請求項1から6までの何れか1項に記載の照明装置。
- 請求項1から7までの何れか1項に記載の照明装置をバックライトとして備えていることを特徴とする液晶表示装置。
- 請求項8に記載の液晶表示装置を備えていることを特徴とするテレビジョン装置。
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CN2009801392498A CN102171507A (zh) | 2008-10-02 | 2009-05-26 | 照明装置和液晶显示装置 |
US13/120,731 US20110170022A1 (en) | 2008-10-02 | 2009-05-26 | Illumination device and liquid crystal display device |
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US20120081618A1 (en) * | 2009-06-15 | 2012-04-05 | Sharp Kabushiki Kaisha | Light emitting module, illuminating device, display device, and television receiving device |
US8646953B2 (en) * | 2011-01-11 | 2014-02-11 | Nittoh Kogaku K.K. | Light guiding body and light emitting device |
CN111831064B (zh) * | 2019-04-22 | 2022-02-18 | 华硕电脑股份有限公司 | 具有发光饰条的电子装置 |
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JP3373427B2 (ja) * | 1998-03-31 | 2003-02-04 | 日東樹脂工業株式会社 | タンデム型面光源装置 |
KR100806093B1 (ko) * | 2000-04-27 | 2008-02-21 | 가부시키가이샤 구라레 | 면광원소자 및 이를 사용한 표시장치 |
TWI254815B (en) * | 2001-05-22 | 2006-05-11 | Nichia Corp | Guide-plate for a plane-luminous device |
TW575722B (en) * | 2002-09-02 | 2004-02-11 | Hannstar Display Corp | Planar light source device and liquid crystal display |
JP4441426B2 (ja) * | 2005-03-22 | 2010-03-31 | シャープ株式会社 | 面照明装置及びそれを備えた液晶表示装置 |
-
2009
- 2009-05-26 US US13/120,731 patent/US20110170022A1/en not_active Abandoned
- 2009-05-26 WO PCT/JP2009/059594 patent/WO2010038508A1/ja active Application Filing
- 2009-05-26 CN CN2009801392498A patent/CN102171507A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006114380A (ja) * | 2004-10-15 | 2006-04-27 | Toppan Printing Co Ltd | 導光板およびバックライトユニット |
JP2007103181A (ja) * | 2005-10-05 | 2007-04-19 | Fujifilm Corp | 面光源装置、および表示器 |
JP2008027695A (ja) * | 2006-07-20 | 2008-02-07 | Hayashi Kagaku Kogyo Kk | 反射体装置 |
Also Published As
Publication number | Publication date |
---|---|
CN102171507A (zh) | 2011-08-31 |
US20110170022A1 (en) | 2011-07-14 |
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