JPH0581909B2 - - Google Patents
Info
- Publication number
- JPH0581909B2 JPH0581909B2 JP1076443A JP7644389A JPH0581909B2 JP H0581909 B2 JPH0581909 B2 JP H0581909B2 JP 1076443 A JP1076443 A JP 1076443A JP 7644389 A JP7644389 A JP 7644389A JP H0581909 B2 JPH0581909 B2 JP H0581909B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- plate
- brightness
- lighting device
- diffuser plate
- 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.)
- Expired - Lifetime
Links
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 238000009792 diffusion process Methods 0.000 claims description 13
- 238000005286 illumination Methods 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、照明用の光拡散装置で例えば液晶を
用いた表示装置におけるバツクライトとして使用
するのに適した照明装置に用いられる光拡散装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light diffusion device for use in a lighting device suitable for use as a backlight in a display device using liquid crystal, for example. It is something.
液晶を用いた表示装置は、一定面積の表示面を
均一な輝度にて照明する必要がある。そのために
薄型であつて一定面内において均一に照明が可能
な照明装置が要求される。このような要求を満足
する照明装置として、従来第４図に示すような照
明装置が知られている。即ち、反射板１の反射面
１ａ側に蛍光管等の直線状の光源２を配置し、更
に拡散板３を配置したもので、光源２より直接又
は反射板１にて反射された後拡散板３に達した光
を、この拡散板３にて拡散光として照明光として
用いるものである。
A display device using a liquid crystal needs to illuminate a display surface of a certain area with uniform brightness. Therefore, a lighting device that is thin and capable of uniformly illuminating within a certain plane is required. As a lighting device that satisfies such requirements, a lighting device as shown in FIG. 4 is conventionally known. That is, a linear light source 2 such as a fluorescent tube is arranged on the reflective surface 1a side of the reflecting plate 1, and a diffuser plate 3 is further arranged, either directly from the light source 2 or after being reflected by the reflecting plate 1. The light that reaches 3 is diffused by this diffuser plate 3 and used as illumination light.
又、図示しないが拡散板の下側に導光板を配す
ると共に拡散板とは反対側に反射板を配して、該
導光板の側方に光源を配設した照明装置も知られ
ている。 Although not shown, there is also known a lighting device in which a light guide plate is disposed below the diffuser plate, a reflection plate is disposed on the opposite side of the diffuser plate, and a light source is disposed on the side of the light guide plate. .
このような照明装置は、薄型で均一な輝度の拡
散光を得るために前者の場合には反射板２の曲面
形状等に改良を加えたものが知られている。そし
ていずれの場合にも上記の要求を可成り満足した
ものが得られている。 In the former case, such a lighting device is known to have an improved curved shape of the reflection plate 2 in order to obtain diffused light with a thin shape and uniform brightness. In each case, a product that satisfies the above requirements to a large extent has been obtained.
しかるに、このような照明装置は、薄型で均一
な輝度分布を有することのほか、出来る限り高い
輝度の明るい照明が可能であることも要求され
る。この要求は、前記後者（導光式）の場合に
は、主出射方向が斜めとなるため、輝度面に垂直
の方向での高輝度化ということが特に望まれてい
る。
However, such a lighting device is required not only to be thin and have a uniform brightness distribution, but also to be able to provide bright illumination with as high a brightness as possible. In the case of the latter type (light guide type), the main emission direction is oblique, so it is particularly desirable to achieve high brightness in the direction perpendicular to the brightness plane.
したがつて本発明は、薄型で均一な輝度分布が
得られる上に、一層明るい高輝度面の照明装置を
提供することを目的とするものである。 Accordingly, an object of the present invention is to provide a lighting device that is thin and has a uniform brightness distribution, and also has a brighter and brighter surface.
本発明の照明装置は、前記の目的を達成するた
めに、前述の従来の照明装置の拡散板の前面に拡
散板上の各点より拡散する光を拡散板に垂直な方
向を中心として一定の角度範囲内に向かうように
その拡がりを規制するための規制板を配置したも
のである。
In order to achieve the above-mentioned object, the lighting device of the present invention directs the light diffused from each point on the diffusion plate to the front surface of the diffusion plate of the conventional lighting device at a constant rate centered on the direction perpendicular to the diffusion plate. A regulating plate is arranged to regulate the spread within the angular range.
例えば液晶を用いた表示装置においては、表示
板上の画像その他を観察する場合にそのほとんど
が表示板に垂直な方向より画像等をみている。 For example, in a display device using a liquid crystal, when viewing an image or the like on a display board, the image or the like is mostly viewed from a direction perpendicular to the display board.
本発明は、拡散板よりその垂直線に対し大きな
角度にて拡散する光は、表示板の観察には全くか
殆んど寄与していないことに着目してなされたも
のである。つまり拡散板上の各点より拡散する光
を夫々全体として拡散板に垂直な方向に導くよう
にしたその広がりを規制するための規制板を拡散
板の全面に並設するものである。そしてこれらに
よつて、従来利用されない大きな角度で拡散する
光を利用するようにして拡散板よりの光の輝度を
大にしたものである。しかも拡散板上より拡散す
る光のすべてがその垂直方向に対する角度が小さ
くなるようにその広がりを規制板により導かれる
ために輝度分布の均一性は保つたまま全体として
輝度を高めることが出来る。 The present invention was made based on the fact that light diffused by a diffuser plate at a large angle with respect to the perpendicular line contributes little or nothing to the observation of the display plate. In other words, regulating plates are arranged over the entire surface of the diffuser plate to guide the light diffused from each point on the diffuser plate in a direction perpendicular to the diffuser plate, and to restrict the spread of the light. With these, the brightness of the light from the diffuser plate is increased by utilizing light that is diffused at a large angle that has not been used conventionally. Furthermore, since all of the light that diffuses from above the diffuser plate is guided by the regulating plate so that its angle with respect to the vertical direction becomes small, the overall brightness can be increased while maintaining the uniformity of the brightness distribution.
本発明で用いられる規制板としては、後に実施
例において具体的に説明するような拡散板側が直
線で他の側が鋸歯状の断面形状をした透明板で、
その鋸歯状部の長さ方向を直線状の光源の長さ方
向に向けた配置としたもの等が考えられる。この
場合には鋸歯形状を規制正しい形状としておくこ
とにより所定の指向性をもたせることができ、効
率よく輝度面に垂直方向の輝度を上げることがで
きる。 The regulating plate used in the present invention is a transparent plate having a straight line on the diffuser side and a sawtooth cross-section on the other side, as will be specifically explained later in Examples.
An arrangement may be considered in which the length direction of the sawtooth portion is directed toward the length direction of a linear light source. In this case, by setting the sawtooth shape to a properly regulated shape, a predetermined directivity can be provided, and the brightness in the direction perpendicular to the brightness plane can be efficiently increased.
又、鋸歯状に代えて不連続、不定の凹凸形状た
とえば、シボ形状或は微小な円錐状突起を多数配
した形状とすることもできる。これらの場合には
輝度アツプ率は鋸歯状の場合よりやゝ落ちるが、
目的は達せられる。 Further, instead of the sawtooth shape, a discontinuous or irregular uneven shape, for example, a grained shape or a shape with a large number of minute conical projections may be used. In these cases, the brightness increase rate is slightly lower than in the sawtooth case, but
The purpose will be achieved.
次に本発明の照明装置の一実施例を図面にもと
づいて説明する。第１図は本発明の一実施例の断
面図で、１は反射板、２は直線状の光線、３は拡
散板であつてこれらは従来の照明装置と同じ構成
である。又４は拡散板３上に並設した規制板であ
つて、第２図にその一部を拡大して示した断面形
状のものが連続し、拡散板３の大きさと同じ面積
を有している透明板から成つている。
Next, an embodiment of the lighting device of the present invention will be described based on the drawings. FIG. 1 is a sectional view of an embodiment of the present invention, in which 1 is a reflecting plate, 2 is a linear light beam, and 3 is a diffuser plate, which have the same structure as a conventional lighting device. Reference numeral 4 denotes a regulating plate arranged in parallel on the diffuser plate 3, which has a continuous cross-sectional shape, a part of which is shown in an enlarged manner in FIG. 2, and has the same area as the diffuser plate 3. It consists of a transparent plate.
第２図に示すような、拡散板３の側の面４ａが
平面（断面が直線）であつて、反対側の面４ｂが
断面鋸歯状である透明板の規制板４を拡散板上に
配置すると、拡散板よりの光l1は、この規制板４
にて屈折してから上方へ向かう。この時、面４ａ
に入射した時の角θ1つまり拡散板３より発する光
の角θ1は、面４ｂを出た後は拡散板３に垂直な線
に対して角θ2の方向へ向かう。ここで図面より明
らかなようにθ2＜θ1となる。したがつて、第４図
に示す従来の照明装置において拡散板３上の点
Ａ，Ｂ，Ｃより出来る拡散光は、本発明装置の面
４ｂを出た後は図示するようになる。 As shown in FIG. 2, a regulating plate 4 made of a transparent plate whose surface 4a on the side of the diffusion plate 3 is flat (straight in cross section) and surface 4b on the opposite side with a serrated cross section is arranged on the diffusion plate. Then, the light l 1 from the diffuser plate passes through this regulating plate 4
After refracting at , it heads upward. At this time, surface 4a
The angle θ 1 when the light is incident on the diffuser plate 3, that is, the angle θ 1 of the light emitted from the diffuser plate 3, goes in the direction of an angle θ 2 with respect to a line perpendicular to the diffuser plate 3 after exiting the surface 4b. Here, as is clear from the drawing, θ 2 <θ 1 . Therefore, the diffused light generated from points A, B, and C on the diffuser plate 3 in the conventional illumination device shown in FIG. 4 becomes as shown in the figure after exiting the surface 4b of the device of the present invention.
この実施例において、規制板４の角θが大にな
ると、第３図のように特に面４ａに垂直に入射す
る光l0は面４ｂにて全反射する。そのため角θが
あまり大であると光量の損失につながる。又斜め
に向かう光が少なくなり、斜方向からの観察がし
にくくなる。しかし一般に光源２の直上部は、拡
散板３が光源２に最も近く、そのため他と比べて
輝度が高くなる。したがつて多少の光量の損失を
犠牲にして、上記の全反射を逆に利用して光l0を
除去することにより、他の手段を用いることな
く、又は他の手段との共用によつて拡散板３上で
の輝度の均一化に役立てることも可能である。一
方θがあまり小であると規制板４が平行平面板に
近くなり本発明の効果がほとんど得られなくな
る。したがつてθの値は、照明装置の大きさ（面
積）、材料（屈折率）等によつて適切な範囲に選
択する必要がある。 In this embodiment, when the angle θ of the regulating plate 4 becomes large, especially the light l 0 that is perpendicularly incident on the surface 4a is totally reflected on the surface 4b as shown in FIG. Therefore, if the angle θ is too large, the amount of light will be lost. Furthermore, less light is directed diagonally, making it difficult to observe from an oblique direction. However, in general, the diffuser plate 3 is closest to the light source 2 directly above the light source 2, and therefore the brightness is higher than the other areas. Therefore, at the expense of some loss of light quantity, the above-mentioned total internal reflection can be used inversely to remove the light l0 , without using other means, or by using it in combination with other means. It is also possible to make use of the uniformity of brightness on the diffuser plate 3. On the other hand, if θ is too small, the regulating plate 4 will become close to a parallel plane plate, and the effects of the present invention will hardly be obtained. Therefore, the value of θ needs to be selected within an appropriate range depending on the size (area), material (refractive index), etc. of the lighting device.
例えば、材料としてPMMA（アクリル樹脂）を
用いて220×140mmの大きさの照明装置の場合、θ
＝45度にすると比較的よい効果が得られ、視野角
が35度程度で、表示面上での輝度が同じ装置で規
制板を用いない従来のものに比べて30％上昇し
た。 For example, in the case of a lighting device with a size of 220 x 140 mm using PMMA (acrylic resin) as the material, θ
= 45 degrees, a relatively good effect was obtained, with a viewing angle of about 35 degrees and a 30% increase in brightness on the display screen compared to the same device without a regulating plate.
上記のように、この実施例の規制板４の面４ｂ
の角θの値は、材料の屈折率や使用目的等により
適切な値に選べばよい。ここで使用し得るガラス
やプラスチツク材料の屈折率は、1.4から1.7の範
囲である。そのため、この点を考慮すると前記の
角θの範囲としては、0°＜θ＜60°が適当である。
このθの値は、視野角及び輝度効率等の条件設定
により決められる。又、拡散板３と規制板４は空
気層を介して並設する必要がある。この並設によ
つて規制板４へ入射する光の角度は、拡散板３に
よる拡散光の角度に比べて約60％の角度で狭くな
る。従つて、この現象により視野角はやや狭くな
るものの、輝度効率は大きくアツプする。 As mentioned above, the surface 4b of the regulating plate 4 of this embodiment
The value of the angle θ may be selected appropriately depending on the refractive index of the material, the purpose of use, etc. The refractive index of glass and plastic materials that can be used here ranges from 1.4 to 1.7. Therefore, in consideration of this point, the appropriate range of the angle θ is 0°<θ<60°.
The value of θ is determined by setting conditions such as viewing angle and luminance efficiency. Further, the diffusion plate 3 and the regulation plate 4 need to be arranged side by side with an air layer in between. Due to this juxtaposition, the angle of the light incident on the regulating plate 4 is narrowed by about 60% compared to the angle of the light diffused by the diffuser plate 3. Therefore, although the viewing angle becomes slightly narrower due to this phenomenon, the luminance efficiency is greatly increased.
更に、前述のように、輝度の高い拡散板３の中
央の輝度を落として全体として均一な輝度分布に
するために、中央部のみ、他の部分よりもθを大
にしてもよい。又使用目的等を考慮して場所によ
りθの値を異なるようにすることも有効である。
更に、上記実施例における拡散板、規制板は、板
体でなくシート状のものであつてもかまわない。 Further, as described above, in order to lower the brightness at the center of the diffuser plate 3, which has high brightness, and to achieve a uniform brightness distribution as a whole, θ may be made larger only in the center than in other parts. It is also effective to vary the value of θ depending on the location, taking into consideration the purpose of use.
Further, the diffusion plate and the regulation plate in the above embodiments may be sheet-like instead of plate-like.
又、図示する実施例では面４ｂの各部分が断面
直線であるがわずかに凸面又は凹面になつていて
もよい。又頂点部分も尖つた形状ではなく丸みを
持たせてもよい。即ち、シボ形状或は多数の円錐
状突起を一体に突出形成したもの等のほか、これ
らに類したものでも勿論かまわない。これらの場
合、輝度アツプ率はやゝ落ちるがこれでも目的は
達せられる。 Furthermore, although each portion of the surface 4b has a straight cross section in the illustrated embodiment, it may also have a slightly convex or concave surface. Further, the apex portion may also have a rounded shape instead of a pointed shape. That is, in addition to a textured shape or a shape in which a large number of conical projections are integrally formed in a protruding manner, it is of course possible to use a shape similar to these. In these cases, the brightness increase rate is slightly lower, but the objective can still be achieved.
本発明の照明装置は、従来のものでは使用目的
によつては無駄になつていた大きい角度で拡散す
る光を利用し得るようにしたもので、しかも全体
として拡散方向が小さくなるようにしたため、均
一な輝度分布を保つたまま輝度のみを大にするこ
とが出来、明るく均一な輝度分布のものを得るこ
とが出来る。
The lighting device of the present invention makes it possible to utilize light that is diffused at a large angle, which would be wasted depending on the purpose of use in conventional devices, and furthermore, because the overall direction of diffusion is made small, Only the brightness can be increased while maintaining a uniform brightness distribution, and a bright and uniform brightness distribution can be obtained.
第１図は本発明の一実施例の断面図、第２図、
第３図は夫々上記実施例で用いる規制板の一部を
拡大して示した断面図、第４図は従来の照明装置
の断面図である。
１……反射板、２……光源、３……拡散板、４
……規制板。
FIG. 1 is a sectional view of an embodiment of the present invention, FIG.
FIG. 3 is an enlarged sectional view of a part of the regulating plate used in the above embodiments, and FIG. 4 is a sectional view of a conventional lighting device. 1...Reflector, 2...Light source, 3...Diffusion plate, 4
...Regulation board.
Claims (1)
の面内に導き該面部を略均一の輝度になるように
した照明用の光拡散装置において、前記光拡散装
置は、該光源からの光の入射側に、光を透過拡散
せしめる拡散部材を配設すると共に、出射側に上
記拡散部材の各点より発する拡散光の拡がりを規
制するように各拡散光を導く規制部材を並設して
成ることを特徴とする光拡散装置。 ２ 前記規制部材は、拡散部材側が直線で他の側
が凹凸状の断面形状をした透光部材である請求項
１の光拡散装置。 ３ 前記規制部材は透過率が70％以上である透光
部材である請求項１又は２の光拡散装置。[Scope of Claims] 1. A light diffusing device for illumination that includes a light source and the direction of the light from the light source to guide it within a certain plane so that the surface has substantially uniform brightness, the light diffusing device comprising: , a diffusion member for transmitting and diffusing the light is disposed on the incident side of the light from the light source, and a regulation for guiding each diffused light so as to regulate the spread of the diffused light emitted from each point of the diffusion member on the output side A light diffusing device characterized by comprising members arranged side by side. 2. The light diffusing device according to claim 1, wherein the regulating member is a light-transmitting member having a straight cross section on the diffusion member side and an uneven cross section on the other side. 3. The light diffusing device according to claim 1 or 2, wherein the regulating member is a light-transmitting member having a transmittance of 70% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1076443A JPH02257188A (en) | 1989-03-30 | 1989-03-30 | Illuminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1076443A JPH02257188A (en) | 1989-03-30 | 1989-03-30 | Illuminator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02257188A JPH02257188A (en) | 1990-10-17 |
| JPH0581909B2 true JPH0581909B2 (en) | 1993-11-16 |
Family
ID=13605295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1076443A Granted JPH02257188A (en) | 1989-03-30 | 1989-03-30 | Illuminator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02257188A (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04107237U (en) * | 1991-02-26 | 1992-09-16 | 株式会社ウノン技研 | Surface light source component |
| JPH04356015A (en) * | 1991-03-22 | 1992-12-09 | Tosoh Corp | Back light |
| EP0606939B1 (en) * | 1993-01-11 | 1998-05-06 | Koninklijke Philips Electronics N.V. | Illumination system and display device including such a system |
| DE69418502T2 (en) * | 1993-02-01 | 2000-02-24 | Tosoh Corp | Background lighting device |
| US5598280A (en) * | 1993-03-23 | 1997-01-28 | Dai Nippon Printing Co., Ltd. | Film lens and a surface light source using the same |
| TW417035B (en) * | 1994-05-11 | 2001-01-01 | Sharp Kk | Lighting device and a liquid crystal display using such a device |
| DE69632521T2 (en) * | 1995-08-23 | 2005-05-12 | Koninklijke Philips Electronics N.V. | LIGHTING SYSTEM FOR A FLAT PANEL IMAGE DISPLAY DEVICE |
| KR100427904B1 (en) * | 1995-08-23 | 2004-09-08 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Lighting system for flat panel display devices |
| JPH10246805A (en) | 1997-03-06 | 1998-09-14 | Dainippon Printing Co Ltd | Optical sheet for diffused light control, back light device, and liquid crystal display device |
| US6903788B2 (en) | 2001-07-05 | 2005-06-07 | Nitto Denko Corporation | Optical film and a liquid crystal display using the same |
| JP4472499B2 (en) * | 2004-11-26 | 2010-06-02 | シーケーディ株式会社 | Defect inspection device and PTP packaging machine |
| WO2018038120A1 (en) * | 2016-08-22 | 2018-03-01 | 株式会社ロッソ | Display body and advertisement device |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS564173A (en) * | 1979-04-13 | 1981-01-17 | Suisse Horlogerie | Surface having optical guide diffusion face structure for accepted information display device |
| JPS6070601A (en) * | 1983-08-29 | 1985-04-22 | カナデイアン パテンツ アンド デベロツプメント リミテツド | Illumination panel |
| JPS6155684A (en) * | 1984-08-27 | 1986-03-20 | 三菱レイヨン株式会社 | Light diffuser |
| JPS62144102A (en) * | 1985-11-21 | 1987-06-27 | ミネソタ マイニング アンド マニユフアクチユアリング コンパニ− | Thin elastic film |
| JPS62217501A (en) * | 1986-03-19 | 1987-09-25 | 東芝ライテック株式会社 | Lighting fixture |
| JPS6368814A (en) * | 1986-09-10 | 1988-03-28 | Matsushita Electric Works Ltd | Lighting equipment for liquid crystal display |
| JPS63318003A (en) * | 1987-05-26 | 1988-12-26 | ミネソタ マイニング アンド マニユフアクチユアリング カンパニー | Lighting equipment outputting normalized light |
| JPH0217A (en) * | 1987-11-12 | 1990-01-05 | Mitsubishi Rayon Co Ltd | Surface light source element |
| JPH0277726A (en) * | 1988-09-14 | 1990-03-16 | Hitachi Ltd | Liquid crystal display device |
| JPH0284618A (en) * | 1988-06-02 | 1990-03-26 | Mitsubishi Rayon Co Ltd | Panel light source element |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57184983U (en) * | 1981-05-20 | 1982-11-24 | ||
| JPS6382223U (en) * | 1986-11-17 | 1988-05-30 |
-
1989
- 1989-03-30 JP JP1076443A patent/JPH02257188A/en active Granted
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS564173A (en) * | 1979-04-13 | 1981-01-17 | Suisse Horlogerie | Surface having optical guide diffusion face structure for accepted information display device |
| JPS6070601A (en) * | 1983-08-29 | 1985-04-22 | カナデイアン パテンツ アンド デベロツプメント リミテツド | Illumination panel |
| US4542449A (en) * | 1983-08-29 | 1985-09-17 | Canadian Patents & Development Limited | Lighting panel with opposed 45° corrugations |
| JPS6155684A (en) * | 1984-08-27 | 1986-03-20 | 三菱レイヨン株式会社 | Light diffuser |
| JPS62144102A (en) * | 1985-11-21 | 1987-06-27 | ミネソタ マイニング アンド マニユフアクチユアリング コンパニ− | Thin elastic film |
| JPS62217501A (en) * | 1986-03-19 | 1987-09-25 | 東芝ライテック株式会社 | Lighting fixture |
| JPS6368814A (en) * | 1986-09-10 | 1988-03-28 | Matsushita Electric Works Ltd | Lighting equipment for liquid crystal display |
| JPS63318003A (en) * | 1987-05-26 | 1988-12-26 | ミネソタ マイニング アンド マニユフアクチユアリング カンパニー | Lighting equipment outputting normalized light |
| JPH0217A (en) * | 1987-11-12 | 1990-01-05 | Mitsubishi Rayon Co Ltd | Surface light source element |
| JPH0284618A (en) * | 1988-06-02 | 1990-03-26 | Mitsubishi Rayon Co Ltd | Panel light source element |
| JPH0277726A (en) * | 1988-09-14 | 1990-03-16 | Hitachi Ltd | Liquid crystal display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02257188A (en) | 1990-10-17 |
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