JPH09269417A - Surface light source - Google Patents
Surface light sourceInfo
- Publication number
- JPH09269417A JPH09269417A JP8099679A JP9967996A JPH09269417A JP H09269417 A JPH09269417 A JP H09269417A JP 8099679 A JP8099679 A JP 8099679A JP 9967996 A JP9967996 A JP 9967996A JP H09269417 A JPH09269417 A JP H09269417A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- pattern
- face
- light guide
- 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.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶パネルのバッ
クライト等に用いる面光源装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source device used for a backlight of a liquid crystal panel or the like.
【０００２】[0002]
【従来の技術】従来の導光体を用いた面光源装置の一例
は、図７に示す通りの構成であり、導光体１の一方の端
面（入射端面）１ａの近傍に光源２を配置し、又導光体
１の表面（出射面）１ｂの側には拡散板又は拡散シート
３が又出射面１ｂと反対側の面１ｃの側にはアルミニウ
ム又は銀等の金属箔や白色シート等の反射部材としての
反射板又は反射シート４が設けられている。又導光体１
の面１ｃには拡散性を有するインクで印刷することによ
り、あるいはＶ溝、シボ等の凹凸形状を形成することに
より形成された拡散パターン１０が形成されている。又
拡散シート３の外側には例えば図８に示すような一方の
面が鋸歯状の凹凸形状をなすようなプリズム溝が繰り返
し形成された透明材料よりなるプリズムシート５，６が
設けられており、これらはそのプリズム溝の方向が互い
にほぼ直交するような状態で重ねて配置されている。更
に光源２を覆うように曲げて配置された反射シートより
なる光源用リフレクター７が配置されている。尚、上記
した拡散シートやプリズムシートのような導光体１の出
射面上に配置されて光の拡散、集光、偏向等を行なわせ
るものを総称して光制御部材と呼ぶ。2. Description of the Related Art An example of a conventional surface light source device using a light guide has a structure as shown in FIG. 7, in which a light source 2 is arranged near one end face (incident end face) 1a of a light guide 1. Further, a diffusion plate or a diffusion sheet 3 is provided on the surface (emission surface) 1b side of the light guide 1, and a metal foil such as aluminum or silver or a white sheet is provided on the surface 1c side opposite to the emission surface 1b. Is provided with a reflection plate or a reflection sheet 4 as a reflection member. Also light guide 1
The surface 1c is provided with a diffusion pattern 10 formed by printing with an ink having a diffusivity or by forming an uneven shape such as a V groove or a grain. Further, on the outside of the diffusion sheet 3, prism sheets 5 and 6 made of a transparent material are provided, for example, as shown in FIG. These are stacked so that the directions of their prism grooves are substantially orthogonal to each other. Further, a light source reflector 7 made of a reflection sheet that is bent so as to cover the light source 2 is arranged. It is to be noted that a member such as the above-mentioned diffusion sheet or prism sheet, which is arranged on the exit surface of the light guide body 1 to diffuse, condense, or deflect light, is collectively referred to as a light control member.
【０００３】このような、面光源装置は、光源２よりの
光を導光体１の入射端面１ａより入射させると、光は導
光体１の面１ｂ，１ｃにて反射されながら入射端面１ａ
と反対側の端面へ伝達されていく。そして、このように
導光体内を進む光は、面１ｃに設けられた拡散性パター
ン１０にて一部拡散され出射面より導光体外へ出射す
る。この時、拡散性パターン１０を適切に分布させるこ
とにより導光体１の出射面１ｂから出射される光の輝度
分布は、ほぼ均一なものとなる。この例のように光制御
部材が拡散シート３と２枚のプリズムシート５，６とで
構成されるものでは、出射面１ｂから出射された光は、
まず拡散シート３を通ることにより拡散光となり、更に
２枚のプリズムシート５，６を通ることにより、拡散光
は、出射面１ｂの法線方向へ集光されて全体としてプリ
ズムシートに直角な方向に向けられ、面光源装置を液晶
パネルのバックライトとして使用する場合、観察者の方
へ向けられ明るい画像の観察が可能になる。In such a surface light source device, when the light from the light source 2 is made incident from the incident end face 1a of the light guide 1, the light is reflected by the faces 1b and 1c of the light guide 1, and the incident end face 1a is reflected.
And is transmitted to the end surface on the opposite side. The light thus traveling in the light guide body is partially diffused by the diffusive pattern 10 provided on the surface 1c and emitted from the emission surface to the outside of the light guide body. At this time, by appropriately distributing the diffusive pattern 10, the brightness distribution of the light emitted from the emission surface 1b of the light guide 1 becomes substantially uniform. In the case where the light control member is composed of the diffusion sheet 3 and the two prism sheets 5 and 6 as in this example, the light emitted from the emission surface 1b is
First, it becomes diffused light by passing through the diffusion sheet 3, and further by passing through the two prism sheets 5 and 6, the diffused light is condensed in the normal direction of the emission surface 1b and is in a direction perpendicular to the prism sheet as a whole. When the surface light source device is used as a backlight of a liquid crystal panel, it is directed toward an observer and a bright image can be observed.
【０００４】[0004]
【発明が解決しようとする課題】ところが、このような
面光源装置では、入射端面１ａから入射せずに導光体１
と反射シート４とのすき間等からもれ出した光が反射シ
ートの光源側の端部（入射端面１ａの端部）付近で反射
されて出射面より出射されるのでその付近の出射面が他
の部分に比べて特に明るくなり、輝度分布は図６に曲線
Ａに示すような不均一な状態になる。尚、図６において
Ｉは輝度、Ｄは入射端面（光源側端面）からの距離であ
る。これを防止するため図９に示すような遮光用の印刷
８をほどこしている。しかし、この従来例は、低反射部
分と反射性を有する部分とが急激に変化するため、この
境界線が出射面側から観察され好ましくない。図６は導
光体の入射端面を始点として、ここから離れる方向への
輝度分布を示す。遮光用印刷をほどこさない場合には図
６の曲線Ａ、一定幅の遮光用印刷を設けた場合は曲線Ｃ
に示す通りの輝度分布になる。However, in such a surface light source device, the light guide 1 does not enter from the incident end face 1a.
Light leaking from the gap between the reflection sheet 4 and the reflection sheet 4 is reflected near the light source side end of the reflection sheet (end portion of the incident end face 1a) and emitted from the emission face, so that the emission face in the vicinity is 6 is particularly brighter than that of FIG. 6, and the luminance distribution becomes non-uniform as shown by the curve A in FIG. In FIG. 6, I is the luminance and D is the distance from the incident end face (light source side end face). In order to prevent this, a light-shielding print 8 as shown in FIG. 9 is provided. However, in this conventional example, since the low reflection portion and the portion having reflectivity change abruptly, this boundary line is observed from the emission surface side, which is not preferable. FIG. 6 shows the luminance distribution in the direction away from the light-guiding member starting from the incident end face. Curve A in FIG. 6 when the light-shielding print is not applied, and curve C when the light-shielding print having a constant width is provided.
The brightness distribution is as shown in.
【０００５】本発明は、光源側での出射面だけが特に明
るくなることなく、しかも境界線がみえることなく、し
かし全体として均一な輝度でかつ明るい面光源装置を提
供するものである。The present invention provides a surface light source device in which only the emission surface on the light source side is not particularly bright and the boundary line is not visible, but the brightness is uniform as a whole and bright.
【０００６】[0006]
【課題を解決するための手段】本発明の面光源装置は、
透明材料よりなり出射面を有する導光体と、導光体の一
端面近傍に配置された直線状の光源と、導光体の裏面
（出射面と反対側の面）に設けられた拡散パターンと、
導光体の拡散パターンが設けられた面の側に配置されて
いる反射部材よりなり、反射部材の導光体の側の面で入
射端面側の端部に形成されている遮光作用を施した（低
い反射率の印刷を行なった）もので、遮光作用として、
光源側が反射される光が最低で次第に大になるようにし
たもので、これにより、導光体の光源側の輝度が大にな
るのを防止すると共に、反射光の光量の急激な変化がな
いことにより境界線が生ずることなく、したがって観察
者により、不必要な線が観察されることがない。The surface light source device of the present invention comprises:
A light guide body made of a transparent material and having an emission surface, a linear light source arranged near one end surface of the light guide body, and a diffusion pattern provided on the back surface (surface opposite to the emission surface) of the light guide body. When,
The light guide is composed of a reflecting member arranged on the side of the surface on which the diffusion pattern is provided, and a light shielding effect is formed on the end of the reflecting member on the side of the light guide that is on the incident end surface side. (Printed with low reflectance), as a light blocking effect,
The light reflected from the light source side is made to gradually increase at a minimum, which prevents the brightness of the light source side of the light guide from becoming large, and there is no sudden change in the amount of reflected light. As a result, no boundaries are produced, so that the observer does not see unnecessary lines.
【０００７】又、本発明の面光源装置は、更に前記の遮
光パターンの一部が導光体裏面（反射部材側の面）に形
成されている光拡散パターンと重なり合うようにして、
前記の反射部材に遮光パターンを設けたことにより境界
線が観察されなくなるという効果をより一層増大せしめ
た。Further, in the surface light source device of the present invention, a part of the light shielding pattern is further overlapped with the light diffusion pattern formed on the back surface of the light guide body (surface on the reflection member side),
By providing the light-shielding pattern on the reflecting member, the effect that the boundary line is not observed is further increased.
【０００８】[0008]
【発明の実施の形態】本発明の面光源装置は、図１に示
す通りの構成で、１は導光体、２は光源、３は拡散シー
ト、４は白色のシートからなる反射シート、１０は導光
体１の面１ｃに設けられたシボ、Ｖ溝等の凹凸形状ある
いは拡散性インクの印刷等により形成された拡散パター
ン、７は光源１を覆う反射シートでこれらは図７に示す
従来の面光源装置と実質上同じ構成である。BEST MODE FOR CARRYING OUT THE INVENTION The surface light source device of the present invention has a structure as shown in FIG. 1, where 1 is a light guide, 2 is a light source, 3 is a diffusion sheet, and 4 is a reflection sheet composed of a white sheet. Is a diffusing pattern formed on the surface 1c of the light guide 1 by means of concavo-convex shapes such as V-grooves or by printing diffusible ink, and 7 is a reflection sheet for covering the light source 1. The surface light source device has substantially the same configuration.
【０００９】本発明は、反射シート４の入射端面１ａ側
の部分に遮光作用（反射光を減少させる作用）に勾配を
持つつまり光源に最も近い側が反射光が最小であって遮
光作用が最も大であり、入射端面１ａから離れるにした
がって次第に遮光作用が減少する構成になっている。例
えば図１に示すように遮光材料によるパターン１１を設
け、このパターンの密度を入射端面４ａ側が最も大で次
第に減少するようにしている。そして、このパターン１
１と導光体１の面１ｃに形成された拡散作用をもつパタ
ーン１０とが一部重なり合うように構成されている。In the present invention, the portion of the reflection sheet 4 on the side of the incident end face 1a has a gradient in the light-shielding action (action of reducing the reflected light), that is, the side closest to the light source has the smallest reflected light and the largest light-shielding action. Therefore, the light blocking effect is gradually reduced as the distance from the incident end face 1a increases. For example, as shown in FIG. 1, a pattern 11 made of a light-shielding material is provided, and the density of this pattern is maximized on the incident end face 4a side and gradually decreased. And this pattern 1
1 and the pattern 10 having a diffusing action formed on the surface 1c of the light guide 1 are partially overlapped with each other.
【００１０】図３は、反射シート４に形成されるパター
ン１１の一例を示すもので、導光体１の入射端面側であ
る４ａの側が最も大であり、これより一定距離の４ｂま
での一定幅ｔにわたり、密度が次第に減少するパターン
（この幅ｔは、例えば導光体の長さが１８０ｍｍの場合
には、５ｍｍ程度）である。このパターンを形成するに
は、例えば、印刷インクとして白と黒のインクの割合が
１：４００から黒１００％の範囲内の任意の配合のもの
が用いられる。尚１：４００の配合の印刷インクはかな
り薄いグレーである。FIG. 3 shows an example of the pattern 11 formed on the reflection sheet 4. The side of 4a which is the incident end face side of the light guide 1 is the largest, and a constant distance up to 4b is constant. It is a pattern in which the density gradually decreases over the width t (this width t is, for example, about 5 mm when the length of the light guide is 180 mm). To form this pattern, for example, a printing ink having an arbitrary composition in which the ratio of white and black ink is in the range of 1: 400 to 100% black is used. In addition, the printing ink with the composition of 1: 400 is a fairly light gray.
【００１１】この範囲の濃さのインクと、単位面積当り
のドットの数を適宜選択し、これを用いて前記の図示す
るような分布にする。Ink having a darkness within this range and the number of dots per unit area are appropriately selected and used to obtain the distribution as shown in the figure.
【００１２】本発明の面光源装置では、図１に示すよう
に反射シート上に４ａから４ｂまでのｔ1の範囲にわた
って前述のようなパターン１１が形成されている。そし
て導光体１の面１ｃに設けられている拡散性のパターン
１０は、符号１０ａに示す位置まで設けられており、ｔ
2の範囲において、反射シート４に形成されたパターン
１１と導光体１に形成されているパターン１０とが重な
り合っている。In the surface light source device of the present invention, as shown in FIG. 1, the above-mentioned pattern 11 is formed on the reflection sheet over the range of t 1 from 4a to 4b. The diffusive pattern 10 provided on the surface 1c of the light guide 1 is provided up to the position indicated by reference numeral 10a, and t
In the range of 2 , the pattern 11 formed on the reflection sheet 4 and the pattern 10 formed on the light guide 1 overlap each other.
【００１３】このように反射シート４に形成するパター
ン１１により、入射端面４ａ側における反射光は十分に
抑えられ符号４ｂで示す他方の端部に向けて次第に反射
光は増大する。そして、このパターン１１の端部４ｂに
おいては、反射シート４そのものとの反射の程度の差が
ほとんどなく、そのため、反射光の輝度は、図６の曲線
Ｂにて示すように連続的に変化するため境界が生ずるこ
となく、面光源装置を出射面側の斜め方向から見ても境
界線が見えるというような不都合を生じることがない。By the pattern 11 thus formed on the reflection sheet 4, the reflected light on the incident end face 4a side is sufficiently suppressed, and the reflected light gradually increases toward the other end shown by reference numeral 4b. At the end 4b of the pattern 11, there is almost no difference in the degree of reflection from the reflection sheet 4 itself, so that the brightness of the reflected light continuously changes as shown by the curve B in FIG. Therefore, no boundary occurs, and there is no inconvenience that the boundary line is visible even when the surface light source device is viewed obliquely from the emission surface side.
【００１４】特に図示する例のようにこの反射シート４
の端部に形成する遮光パターンが導光体裏面に形成した
拡散パターンと重なるようにすれば、極めて効果的であ
る。つまり、遮光パターン１１の光源より離れた部分で
の反射光は、拡散パターン１０により拡散されるので、
反射光に境界が生ずることが殆どない。As shown in the illustrated example, this reflection sheet 4 is used.
It is extremely effective if the light-shielding pattern formed at the end portion of is overlapped with the diffusion pattern formed on the back surface of the light guide. That is, since the reflected light at the portion of the light shielding pattern 11 away from the light source is diffused by the diffusion pattern 10,
Boundaries hardly occur in the reflected light.
【００１５】図４は、本発明の面光源装置において、反
射シート表面に形成するパターンの形状を示す。図４の
（Ａ）は丸型のパターンであり、（Ｂ）は四角形状のパ
ターンであり、（Ｃ）はくし型のパターンであり、
（Ｄ）は横線状のパターンであり、いずれも単位面積当
りの密度を変化させてある。つまり４ａが反射シート４
の光源側の辺で、この４ａ近くが最も密度が大で４ａか
ら離れるにつれて密度が小になっている。FIG. 4 shows the shape of a pattern formed on the surface of the reflection sheet in the surface light source device of the present invention. 4A is a circular pattern, FIG. 4B is a quadrangular pattern, and FIG. 4C is a comb pattern.
(D) is a horizontal line-shaped pattern in which the density per unit area is changed. That is, 4a is the reflection sheet 4
Of the light source side, the density is highest near 4a, and the density decreases as the distance from 4a increases.
【００１６】又、図５は反射シート上での遮光パターン
を設ける場所の他の例である。図５の（Ａ）は直線状光
源の電極の位置にはパターンを設けていない例である。
蛍光管のような直線状光源の場合、両端の電極部分では
光量が減少している。そのためその付近には前記遮光パ
ターンは設けないほうが望ましいことがある。又図５の
（Ｂ）は反射シートの全周にわたってパターンを設けた
例（ただし、電極付近は（Ａ）と同様にパターンを設け
ていない。）である。図５の（Ｂ）のように光源側の辺
４ａ以外の３辺にも僅かづつパターンを設けたのは、枠
の側面の反射等により明るくなりすぎるのを防止するた
めである。FIG. 5 shows another example of the place where the light shielding pattern is provided on the reflection sheet. FIG. 5A is an example in which no pattern is provided at the position of the electrode of the linear light source.
In the case of a linear light source such as a fluorescent tube, the amount of light is reduced at the electrode parts at both ends. Therefore, it may be desirable not to provide the light shielding pattern in the vicinity thereof. Further, FIG. 5B is an example in which a pattern is provided over the entire circumference of the reflection sheet (however, the pattern is not provided near the electrodes as in (A)). As shown in FIG. 5B, the reason why the patterns are slightly provided on the three sides other than the side 4a on the light source side is to prevent the side surface of the frame from becoming too bright due to reflection or the like.
【００１７】図２は本発明の面光源装置の他の例を示す
断面図で、図１に示す面光源装置とは、導光体の厚さが
光源から遠ざかるにつれて薄くなっている点で、相違す
る。つまり図１に示す厚さの等しい透明な平板（平行平
面板）の導光体の代わりに厚さが変化する導光体を用い
たものである。しかし、本発明の目的である光源付近で
の輝度均一化等の作用については実質上同じである。又
パターンの形状も図４の（Ａ）、（Ｂ）、（Ｃ）、
（Ｄ）のいずれを用いることも出来る。FIG. 2 is a sectional view showing another example of the surface light source device of the present invention. In the surface light source device shown in FIG. 1, the thickness of the light guide becomes thinner as the distance from the light source increases. Be different. That is, instead of the transparent flat plate (parallel plane plate) having the same thickness shown in FIG. 1, a light guide having a variable thickness is used. However, the operation of uniforming the brightness in the vicinity of the light source, which is the object of the present invention, is substantially the same. Further, the shape of the pattern is (A), (B), (C) of FIG.
Any of (D) can be used.
【００１８】又、図５に示すように他の辺近傍にもパタ
ーンを形成したものも同様に用いることが可能である。Further, as shown in FIG. 5, it is possible to use the one in which a pattern is formed in the vicinity of other sides as well.
【００１９】尚、上述した実施の形態においては、光制
御部材として拡散シート１枚とプリズムシート２枚の合
わせて３枚のシートを用いた構成により説明を行なった
が、本発明はこれ以外にも、拡散シートのみを２枚用い
るもの、プリズムシートのみを２枚用いるもの、拡散シ
ートとプリズムシートとを１枚ずつ用いるもの、これら
に加えて透明な保護シートを用いるもの等、種々の構成
のものに適用可能である。In the above-mentioned embodiment, the light control member is described as a structure using three sheets in total including one diffusion sheet and two prism sheets, but the present invention is not limited to this. Of various configurations, such as one using only two diffusion sheets, one using only two prism sheets, one using one diffusion sheet and one prism sheet, and one using a transparent protective sheet in addition to these. It can be applied to anything.
【００２０】また、反射シートに代えて板状の反射板を
用いることも可能であることは言うまでもない。Needless to say, it is also possible to use a plate-shaped reflecting plate instead of the reflecting sheet.
【００２１】[0021]
【発明の効果】本発明の面光源装置は、導光体の出射面
とは反対側に設けられる反射部材の光源側近傍に所定の
状態で遮光パターンを設けることにより出射面からの出
射光が図６の曲線Ｂに示す通りの輝度分布になり出射面
の光源側が特に明るくなるのを防止し、更に出射面側か
ら見て線状に見えることのない輝度分布の均一で品位の
良好な面光源装置になし得る。According to the surface light source device of the present invention, a light-shielding pattern is provided in a predetermined state in the vicinity of the light source side of the reflecting member provided on the side opposite to the light emitting surface of the light guide so that the light emitted from the light emitting surface can be emitted. A luminance distribution as shown by the curve B in FIG. 6 is obtained to prevent the light source side of the emission surface from becoming particularly bright, and a surface with a uniform luminance distribution and good quality that does not appear as a line when viewed from the emission surface side. It can be used as a light source device.
【図１】 本発明の面光源装置の断面図FIG. 1 is a sectional view of a surface light source device of the present invention.
【図２】 本発明の面光源装置の他の例の断面図FIG. 2 is a cross-sectional view of another example of the surface light source device of the present invention.
【図３】 本発明の面光源装置で用いる反射シートを
示す図FIG. 3 is a diagram showing a reflection sheet used in the surface light source device of the present invention.
【図４】 前記反射シートに形成するパターンの形状
を示す図FIG. 4 is a diagram showing a shape of a pattern formed on the reflection sheet.
【図５】 本発明の面光源装置で用いる反射シート上
のパターンを形成する位置の他の例を示す図FIG. 5 is a diagram showing another example of positions where patterns are formed on a reflection sheet used in the surface light source device of the present invention.
【図６】 従来例および本発明の面光源装置における
輝度分布を示す図FIG. 6 is a diagram showing a luminance distribution in a surface light source device of a conventional example and the present invention.
【図７】 従来の面光源装置の断面図FIG. 7 is a sectional view of a conventional surface light source device.
【図８】 面光源装置で用いるプリズムシートの断面
図FIG. 8 is a sectional view of a prism sheet used in the surface light source device.
【図９】 従来の面光源装置に用いられている反射シ
ートを示す図FIG. 9 is a diagram showing a reflection sheet used in a conventional surface light source device.
１． 導光体 ２． 光源 ３． 拡散シート ４． 反射シート １０． 拡散パターン １１． 遮光パターン 1. Light guide 2. Light source 3. Diffusion sheet 4. Reflective sheet 10. Diffusion pattern 11. Shading pattern
Claims (2)
体と、前記導光体の一端面近傍におかれた光源と、前記
導光体の出射面とは反対側の面に設けられた反射部材
と、前記導光体の反射部材側の面に形成された拡散パタ
ーンとよりなる面光源装置において、前記反射部材の光
源側付近に遮光パターンが形成され該遮光パターンが単
位面積当りの密度が光源側が大でここから離れるにした
がって次第に連続して小になることを特徴とする面光源
装置。1. A light guide body made of a transparent material and having an emission surface, a light source placed in the vicinity of one end surface of the light guide body, and a light guide body provided on a surface opposite to the emission surface. In a surface light source device including a reflection member and a diffusion pattern formed on the reflection member side surface of the light guide, a light shielding pattern is formed near the light source side of the reflection member, and the light shielding pattern has a density per unit area. The surface light source device is characterized in that the light source side is large and becomes gradually smaller as it gets away from it.
一部が前記導光体の反射シート側に形成されている拡散
パターンの一部と重なり合うようにしたことを特徴とす
る請求項１の面光源装置。2. The surface according to claim 1, wherein a part of the pattern formed on the reflection member overlaps a part of the diffusion pattern formed on the reflection sheet side of the light guide. Light source device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8099679A JPH09269417A (en) | 1996-03-29 | 1996-03-29 | Surface light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8099679A JPH09269417A (en) | 1996-03-29 | 1996-03-29 | Surface light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09269417A true JPH09269417A (en) | 1997-10-14 |
Family
ID=14253726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8099679A Pending JPH09269417A (en) | 1996-03-29 | 1996-03-29 | Surface light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09269417A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001126521A (en) * | 1999-10-26 | 2001-05-11 | Nippon Leiz Co Ltd | Light guide plate and plane illuminating device |
| JP2002214407A (en) * | 2001-01-19 | 2002-07-31 | Keiwa Inc | Optical sheet, method for producing the sheet and backlight unit using the sheet |
| US10768479B2 (en) | 2014-10-31 | 2020-09-08 | Lg Electronics Inc. | Backlight unit and display device including backlight unit |
-
1996
- 1996-03-29 JP JP8099679A patent/JPH09269417A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001126521A (en) * | 1999-10-26 | 2001-05-11 | Nippon Leiz Co Ltd | Light guide plate and plane illuminating device |
| JP2002214407A (en) * | 2001-01-19 | 2002-07-31 | Keiwa Inc | Optical sheet, method for producing the sheet and backlight unit using the sheet |
| JP4638061B2 (en) * | 2001-01-19 | 2011-02-23 | 恵和株式会社 | Optical sheet, method for manufacturing the optical sheet, and backlight unit using the optical sheet |
| US10768479B2 (en) | 2014-10-31 | 2020-09-08 | Lg Electronics Inc. | Backlight unit and display device including backlight unit |
| US10838254B2 (en) | 2014-10-31 | 2020-11-17 | Lg Electronics Inc. | Backlight unit and display device including backlight unit |
| US11287691B2 (en) | 2014-10-31 | 2022-03-29 | Lg Electronics Inc. | Backlight unit and display device including backlight unit |
| US11579487B2 (en) | 2014-10-31 | 2023-02-14 | Lg Electronics Inc. | Backlight unit and display device including backlight unit |
| US11860474B2 (en) | 2014-10-31 | 2024-01-02 | Lg Electronics Inc. | Backlight unit and display device including backlight unit |
| US12013611B2 (en) | 2014-10-31 | 2024-06-18 | Lg Electronics Inc. | Backlight unit and display device including backlight unit |
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