JP2007220447A - Sidelight type backlight apparatus - Google Patents

Sidelight type backlight apparatus Download PDF

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Publication number
JP2007220447A
JP2007220447A JP2006038931A JP2006038931A JP2007220447A JP 2007220447 A JP2007220447 A JP 2007220447A JP 2006038931 A JP2006038931 A JP 2006038931A JP 2006038931 A JP2006038931 A JP 2006038931A JP 2007220447 A JP2007220447 A JP 2007220447A
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Prior art keywords
light
guide plate
type backlight
light guide
sidelight type
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Japanese (ja)
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Hirokazu Nakamura
浩積 中村
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Toshiba Lighting and Technology Corp
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Harison Toshiba Lighting Corp
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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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • 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
    • G02B6/0066—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
    • G02B6/0073—Light emitting diode [LED]

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sidelight type backlight apparatus employing an LED as a light source that allows a light emission surface of a light guide plate to emit light uniformly without any difference in brightness. <P>SOLUTION: The sidelight type backlight apparatus comprises a plurality of point light sources 6 and the light guide plate 1 for guiding light so that light from the point light sources is introduced from a light incidence surface 11, is reflected at a reflecting surface 12 and exits from the light emission surface 13. A reflection pattern 15 for reflecting the light introduced from the light incidence surface 11 toward the light emission surface 13 is formed at the reflecting surface 12 of the light guide plate 1, and a penetrating hole 14 is formed parallel to the light incidence surface in a portion of the light guide plate near the light incidence surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、液晶表示装置用のサイドライト型バックライト装置に関する。   The present invention relates to a sidelight type backlight device for a liquid crystal display device.

従来より、薄型が特に要求される液晶表示装置、例えば、ノート型ＰＣ、車載ナビゲーション用テレビ等には、細管の蛍光ランプと導光板、レンズシート、拡散シートなどで構成されるサイドライト型バックライト装置が採用されてきた。ところが、近年、青色ＬＥＤや白色ＬＥＤの性能が向上し、安価に入手できるようになってきたことから、光源として冷陰極蛍光ランプが主流であったサイドライト型バックライト装置にも、このＬＥＤを光源として採用するものが開発されている。―特開２００１−１６０３１２号公報（特許文献１）。このＬＥＤを光源とするサイドライト型バックライト装置は、ＬＥＤの点灯制御回路が簡単であり、また低電力化も期待できるため、将来に大きな需要が期待できる。   Conventionally, for a liquid crystal display device that is particularly required to be thin, for example, a notebook PC, an in-vehicle navigation TV, etc., a sidelight type backlight composed of a thin tube fluorescent lamp, a light guide plate, a lens sheet, a diffusion sheet, etc. Devices have been adopted. However, in recent years, the performance of blue LEDs and white LEDs has improved, and it has become possible to obtain them at low cost. Therefore, this LED is also used in sidelight type backlight devices where cold cathode fluorescent lamps have been mainstream as light sources. What is used as a light source has been developed. -Unexamined-Japanese-Patent No. 2001-160312 (patent document 1). The sidelight type backlight device using the LED as a light source has a simple LED lighting control circuit and can be expected to reduce power consumption.

ＬＥＤを光源とするサイドライト型バックライト装置の場合、点光源であるＬＥＤを多数個、列をなすように配置してサイドライトとし、この多数個の列設されたＬＥＤからの光を導光板の端面から導入し、導光板内で散乱、拡散させて発光面から液晶パネルに向けて出光させる構成である。   In the case of a sidelight type backlight device using LEDs as a light source, a large number of point light source LEDs are arranged in a row to form a sidelight, and light from the multiple rows of LEDs is a light guide plate In this configuration, light is emitted from the light emitting surface toward the liquid crystal panel by scattering and diffusing in the light guide plate.

このような構成のサイドライト型バックライト装置の場合、光源がＬＥＤという点光源であるので、ＬＥＤを多数列設しても各ＬＥＤ部分とＬＥＤ間部分とで明暗が生じることが避けられない。そのため、導光板の発光面を明暗差なく均一に発光させる技術の開発が要求されている。
特開２００１−１６０３１２号公報 In the case of the side light type backlight device having such a configuration, since the light source is a point light source called LEDs, it is inevitable that light and dark will occur between each LED portion and the portion between the LEDs even if a large number of LEDs are arranged. Therefore, there is a demand for the development of a technique for uniformly emitting light on the light emitting surface of the light guide plate without any difference in brightness.
JP 2001-160312 A

本発明は、このような従来の技術的課題に鑑みてなされたもので、導光板の発光面を明暗差なく均一に発光させることができるＬＥＤを光源とするサイドライト型バックライト装置を提供することを目的とする。   The present invention has been made in view of such a conventional technical problem, and provides a sidelight type backlight device using an LED capable of emitting light uniformly on a light emitting surface of a light guide plate without any difference in brightness. For the purpose.

請求項１の発明は、複数個の点光源と、前記点光源からの光を入光面から導入し、反射面にて反射させて発光面からその光を出光するように導光する導光板とを備えたサイドライト型バックライト装置において、前記導光板の反射面に、前記入光面から導入された光を前記発光面に向けて反射させる反射パターンを形成し、かつ、前記導光板における前記入光面の近くの部分に当該入光面に平行に貫通孔を形成したものである。   According to the first aspect of the present invention, a plurality of point light sources and a light guide plate that introduces light from the point light source from a light incident surface, reflects the light from the reflection surface, and guides the light from the light emitting surface. A reflective pattern that reflects light introduced from the light incident surface toward the light emitting surface is formed on the reflective surface of the light guide plate, and in the light guide plate A through hole is formed in a portion near the light incident surface in parallel to the light incident surface.

請求項２の発明は、請求項１のサイドライト型バックライト装置において、前記導光板において、前記貫通孔は前記入光面の近傍に形成し、前記反射パターンは当該貫通孔の際から前記反射面の全体に形成したことを特徴とするものである。   According to a second aspect of the present invention, in the sidelight type backlight device of the first aspect, in the light guide plate, the through hole is formed in the vicinity of the light incident surface, and the reflection pattern is reflected from the side of the through hole. It is characterized by being formed over the entire surface.

請求項３の発明は、請求項１又は２のサイドライト型バックライト装置において、前記貫通孔を複数箇所に形成したことを特徴とするものである。   According to a third aspect of the present invention, in the sidelight type backlight device of the first or second aspect, the through-hole is formed at a plurality of locations.

本発明のサイドライト型バックライト装置によれば、導光板の反射面に、その入光面から導入された光を発光面に向けて反射させる反射パターンを形成し、かつ、導光板における入光面の近くの部分に当該入光面に平行に貫通孔を形成したことにより、強い指向性を持つ点光源を多数個列設してサイドライトとしていても、導光板内の貫通光により入射光を効果的に拡散させることができ、その発光面を明暗差なく均一に発光させることができる。   According to the sidelight type backlight device of the present invention, a reflection pattern for reflecting light introduced from the light incident surface toward the light emitting surface is formed on the reflection surface of the light guide plate, and the light incident on the light guide plate. By forming a through-hole in the part near the surface parallel to the light incident surface, even if a number of point light sources with strong directivity are arranged in a row to form a sidelight, incident light is transmitted by the through-light in the light guide plate. Can be effectively diffused, and the light emitting surface can emit light uniformly without any difference in brightness.

以下、本発明の実施の形態を図に基づいて詳説する。図１に示した本発明の１つの実施の形態の液晶表示装置用のサイドライト型バックライト装置は、透明板の導光板１の背面側（図で下面側）に反射シート２を配置し、導光板１の前面側に順に光を拡散させるための第１の拡散シート３、レンズシート４、第２の拡散シート５を配置し、また、導光板１の入光面を成す側面に多数個のＬＥＤ６を列設したＬＥＤアセンブリ７を配置し、これらの構成部材を、筐体を成すバックフレーム８とフロントフレーム９との間に組み込んだ構成である。ゴムホルダ１０はＬＥＤアセンブリ７をバックフレーム８に対して保持すると共にＬＥＤ６群に給電するためのものである。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The sidelight type backlight device for a liquid crystal display device according to one embodiment of the present invention shown in FIG. 1 has a reflective sheet 2 disposed on the back side (lower side in the figure) of the light guide plate 1 of a transparent plate, A first diffusion sheet 3, a lens sheet 4, and a second diffusion sheet 5 for sequentially diffusing light are arranged on the front surface side of the light guide plate 1. The LED assembly 7 in which the LEDs 6 are arranged is arranged, and these constituent members are assembled between the back frame 8 and the front frame 9 constituting the housing. The rubber holder 10 is for holding the LED assembly 7 against the back frame 8 and supplying power to the LED 6 group.

図２、図３に示すように、導光板１の側面の入光面１１に対して、ＬＥＤアセンブリ７が近接して設置されている。導光板１はこのＬＥＤアセンブリ７に対向する側面を入光面１１とし、そして図で底面となる面を反射面１２とし、この反射面１２とは反対側の表面を発光面１３としている。そして、導光板１における入光面１１に近接する位置に入光面１１と平行に貫通孔１４が形成されている。この貫通孔１４は、ＬＥＤアセンブリ７の各ＬＥＤ６から導光板１に入光面１１を通して入光した光を反射面１２、発光面１３に平行な方向へ拡散させる働きをするものである。図４、図５に示すように、導光板１の反射面１２には、貫通孔１４よりも中央部よりの位置から始まり、そのほぼ全面に印刷、シボあるいはサンドブラスト処理により反射パターン１５を形成し、入光面１１から導光板１に入光し、貫通孔１４にて拡散した光を発光面１３の方向に効果的に反射させるようにしてある。   As shown in FIGS. 2 and 3, the LED assembly 7 is installed close to the light incident surface 11 on the side surface of the light guide plate 1. In the light guide plate 1, a side surface facing the LED assembly 7 is a light incident surface 11, a surface serving as a bottom surface in the figure is a reflective surface 12, and a surface opposite to the reflective surface 12 is a light emitting surface 13. A through hole 14 is formed in the light guide plate 1 at a position close to the light incident surface 11 in parallel with the light incident surface 11. The through-hole 14 functions to diffuse light that has entered the light guide plate 1 from the LEDs 6 of the LED assembly 7 through the light incident surface 11 in a direction parallel to the reflective surface 12 and the light emitting surface 13. As shown in FIGS. 4 and 5, the reflective surface 12 of the light guide plate 1 starts from a position closer to the center than the through hole 14, and a reflective pattern 15 is formed on almost the entire surface by printing, embossing or sandblasting. The light that enters the light guide plate 1 from the light incident surface 11 and diffuses through the through hole 14 is effectively reflected in the direction of the light emitting surface 13.

次に、上記構成のサイドライト型バックライト装置の動作を説明する。図３（ａ）に示すように点光源であるＬＥＤ６から光２１はある程度の拡がり幅ｘをもって出光する。このＬＥＤ６からの光２１は、図３（ｂ）に示すように、入光面１１を通して導光板１内に入光し、導光板１の屈折率により屈折して光２２に示すように拡がり、貫通孔１４にて再度空中に出向して光２３に示すようにさらに拡がり、そして貫通孔１４を出て再び導光板１内に入光するときにも屈折し、光２４としてさらに拡がり幅ｙ（ｘ＜＜ｙ）まで拡がり、十分に拡散した光として反射面１２上に導光される。これにより、多数の点光源であるＬＥＤ６からの光が同様に十分に拡散して導光板１の反射面１２上に導光されることになるので、点光源ゆえにそのＬＥＤ部とＬＥＤ間部とで明暗がはっきりしていたものが、反射面１２上に導入されたときには明暗差がない均一な明るさになる。   Next, the operation of the sidelight type backlight device having the above configuration will be described. As shown in FIG. 3 (a), the light 21 is emitted from the LED 6, which is a point light source, with a certain spread width x. The light 21 from the LED 6 enters the light guide plate 1 through the light incident surface 11 as shown in FIG. 3B, is refracted by the refractive index of the light guide plate 1, and spreads as shown in the light 22. The light passes through the through-hole 14 again and spreads further as shown by the light 23, and is also refracted when it exits the through-hole 14 and enters the light guide plate 1 again. The light spreads to x << y) and is guided onto the reflecting surface 12 as sufficiently diffused light. As a result, light from the LED 6 that is a large number of point light sources is similarly sufficiently diffused and guided onto the reflecting surface 12 of the light guide plate 1. However, when it is introduced on the reflecting surface 12, it has a uniform brightness with no difference in brightness.

例えば、導光板１が屈折率１．４９の透明アクリル板であり、導光板１の入光面１１から２ｍｍの位置に１．５ｍｍ幅の貫通孔１４を形成した場合、導光板１に貫通孔１４を形成しない場合の拡がり幅ｘに対して、拡がり幅ｙは１５％程度広くなる。   For example, when the light guide plate 1 is a transparent acrylic plate having a refractive index of 1.49 and a through hole 14 having a width of 1.5 mm is formed at a position 2 mm from the light incident surface 11 of the light guide plate 1, the through hole is formed in the light guide plate 1. The spread width y is about 15% wider than the spread width x when 14 is not formed.

こうして導光板１に反射面１２上にほぼ均一な明るさになって導入された光は、反射面１２の反射パターン１５によって発光面１３側に反射され、発光面１３から輝度のバラツキがない均一な輝度分布の光として出光し、液晶パネルの全体を背方から明暗のむらなく照明することができることになる。   Thus, the light introduced to the light guide plate 1 with substantially uniform brightness on the reflection surface 12 is reflected to the light emission surface 13 side by the reflection pattern 15 of the reflection surface 12, and the light emission surface 13 is uniform with no variation in luminance. As a result, the entire liquid crystal panel can be illuminated from the back without unevenness of light and darkness.

尚、図６（ａ）〜（ｃ）に示したように、貫通孔１４の幅の大小によって光の拡がり幅は異なる。貫通孔１４を設けない場合の拡がり幅ｘに対して、貫通孔１４の幅Ａ，Ｂ（Ａ＜Ｂ）とした場合の光の拡がり幅ｙ，ｚはｙ＜ｚとなり、貫通孔１４の幅を適度に大きくすることで点光源であるＬＥＤ６のＬＥＤ間の暗線部を補い、発光面１３からより均一な輝度分布の光を出光できることになる。また、入射光の均一な拡散を確保するために貫通孔１４を複数条、近接して列設することも可能である。   As shown in FIGS. 6A to 6C, the light spreading width varies depending on the width of the through hole 14. With respect to the expansion width x when the through hole 14 is not provided, the light expansion widths y and z when the widths A and B (A <B) of the through hole 14 are y <z, and the width of the through hole 14 By appropriately increasing the distance, the dark line portion between the LEDs of the point light source LED 6 can be compensated, and light with a more uniform luminance distribution can be emitted from the light emitting surface 13. It is also possible to arrange a plurality of through holes 14 in close proximity to ensure uniform diffusion of incident light.

本発明の１つの実施の形態のサイドライト型バックライト装置の分解斜視図。1 is an exploded perspective view of a sidelight type backlight device according to one embodiment of the present invention. 上記実施の形態のサイドライト型バックライト装置のＬＥＤアセンブリと導光板の貫通孔部分との拡大斜視図。The expansion perspective view of the LED assembly of the sidelight type backlight device of the above-mentioned embodiment and the through-hole part of a light guide plate. 上記実施の形態のサイドライト型バックライト装置におけるＬＥＤから導光板に入光した光の拡散挙動の説明図。Explanatory drawing of the diffusion behavior of the light which entered into the light-guide plate from LED in the sidelight type backlight apparatus of the said embodiment. 上記実施の形態のサイドライト型バックライト装置の垂直断面図。The vertical sectional view of the sidelight type backlight device of the above-mentioned embodiment. 上記実施の形態のサイドライト型バックライト装置の底面図。The bottom view of the sidelight type backlight apparatus of the said embodiment. 上記実施の形態のサイドライト型バックライト装置において、導光板に形成する貫通孔の幅と光の拡がり幅との関係を示す説明図。In the sidelight type backlight device of the above embodiment, an explanatory view showing the relationship between the width of the through hole formed in the light guide plate and the light spreading width.

符号の説明Explanation of symbols

１ 導光板
６ ＬＥＤ
７ ＬＥＤアセンブリ
１１ 入光面
１２ 反射面
１３ 発光面
１４ 貫通孔
１５ 反射パターン 1 Light guide plate 6 LED
7 LED assembly 11 Light incident surface 12 Reflective surface 13 Light emitting surface 14 Through hole 15 Reflective pattern

Claims (3)

複数個の点光源と、前記点光源からの光を入光面から導入し、反射面にて反射させて発光面からその光を出光するように導光する導光板とを備えたサイドライト型バックライト装置において、
前記導光板の反射面に、前記入光面から導入された光を前記発光面に向けて反射させる反射パターンを形成し、かつ、前記導光板における前記入光面の近くの部分に当該入光面に平行に貫通孔を形成したことを特徴とするサイドライト型バックライト装置。 A sidelight type comprising a plurality of point light sources and a light guide plate that introduces light from the point light sources from a light incident surface, reflects the light from a reflection surface, and guides the light from the light emission surface. In the backlight device,
A reflection pattern for reflecting the light introduced from the light incident surface toward the light emitting surface is formed on the reflection surface of the light guide plate, and the light incident on a portion of the light guide plate near the light incident surface. A sidelight type backlight device characterized in that a through hole is formed in parallel to the surface. 前記導光板において、前記貫通孔は前記入光面の近傍に形成し、前記反射パターンは当該貫通孔の際から前記反射面の全体に形成したことを特徴とする請求項１に記載のサイドライト型バックライト装置。   2. The sidelight according to claim 1, wherein in the light guide plate, the through hole is formed in the vicinity of the light incident surface, and the reflective pattern is formed on the entire reflective surface from the side of the through hole. Type backlight device. 前記貫通孔を複数箇所に形成したことを特徴とする請求項１又は２に記載のサイドライト型バックライト装置。   The sidelight type backlight device according to claim 1 or 2, wherein the through holes are formed at a plurality of locations.
JP2006038931A 2006-02-16 2006-02-16 Sidelight type backlight apparatus Pending JP2007220447A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2501956A (en) * 2012-05-10 2013-11-13 Lg Display Co Ltd Light guide plate and liquid crystal display apparatus using the same
US9423553B2 (en) 2011-09-20 2016-08-23 3M Innovative Properties Company Backlight device
KR101788318B1 (en) 2010-12-28 2017-10-19 엘지디스플레이 주식회사 Backlight unit and liquid crystal module using the same, and fabricating method of the backlight unit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101788318B1 (en) 2010-12-28 2017-10-19 엘지디스플레이 주식회사 Backlight unit and liquid crystal module using the same, and fabricating method of the backlight unit
US9423553B2 (en) 2011-09-20 2016-08-23 3M Innovative Properties Company Backlight device
GB2501956A (en) * 2012-05-10 2013-11-13 Lg Display Co Ltd Light guide plate and liquid crystal display apparatus using the same
GB2501956B (en) * 2012-05-10 2015-02-25 Lg Display Co Ltd Light guide plate and liquid crystal display apparatus using the same
US9007546B2 (en) 2012-05-10 2015-04-14 Lg Display Co., Ltd. Light guide plate and liquid crystal display apparatus using the same
DE102012112819B4 (en) * 2012-05-10 2016-10-20 Lg Display Co., Ltd. LIGHT PANEL AND THIS USING LIQUID CRYSTAL DISPLAY DEVICE

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