JPH04251222A - Projection type liquid crystal display device - Google Patents
Projection type liquid crystal display deviceInfo
- Publication number
- JPH04251222A JPH04251222A JP3000940A JP94091A JPH04251222A JP H04251222 A JPH04251222 A JP H04251222A JP 3000940 A JP3000940 A JP 3000940A JP 94091 A JP94091 A JP 94091A JP H04251222 A JPH04251222 A JP H04251222A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light
- crystal display
- display device
- display
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 53
- 239000006096 absorbing agent Substances 0.000 claims abstract description 18
- 230000005684 electric field Effects 0.000 abstract description 4
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 239000004815 dispersion polymer Substances 0.000 abstract 1
- 239000000758 substrate Substances 0.000 description 12
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000009747 swallowing Effects 0.000 description 6
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- 229910019336 PrMnO3 Inorganic materials 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は光の透過と散乱により表
示を行なう液晶表示素子を用いた投写型液晶表示装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type liquid crystal display device using a liquid crystal display element that performs display by transmitting and scattering light.
【０００２】0002
【従来の技術】従来、光の透過と散乱を用いた液晶表示
装置として、高分子分散型液晶（ＰＤＬＣ：Ｐｏｌｙｍ
ｅｒ−Ｄｉｓｐｅｒｓｅｄ Ｌｉｑｕｉｄ Ｃｒｙｓ
ｔａｌ）を用いた調光ガラスが実用化されている。これ
は図１に示すように高分子のスポンジ状三次元網目構造
の中に低分子液晶を保持した特殊な膜である。高分子分
散型液晶は、電圧印加にともなって光散乱状態から光透
過状態へと変化するので、この性質を利用して表示装置
としても用いられている。投写型液晶表示装置では光散
乱状態を黒とし光透過状態を白と表示するのが一般的で
あり、偏光板を必要としないので明るさを上げる手段と
して期待されている。[Prior Art] Conventionally, polymer dispersed liquid crystal (PDLC) has been used as a liquid crystal display device that uses light transmission and scattering.
er-Dispersed Liquid Crys
Light control glass using tal) has been put into practical use. As shown in Figure 1, this is a special film that holds low-molecular liquid crystals within a spongy three-dimensional polymer network structure. Polymer-dispersed liquid crystals change from a light-scattering state to a light-transmitting state as voltage is applied, and this property is used as a display device. Projection type liquid crystal display devices generally display black in a light scattering state and white in a light transmitting state, and because they do not require a polarizing plate, they are expected to be a means of increasing brightness.
【０００３】0003
【発明が解決しようとする課題】しかし前述の従来技術
を投写型表示装置に用いた場合、黒表示の散乱光を投写
レンズで呑込んでしまうためコントラスト比が低くなっ
てしまう。またコントラスト比を高くするには投写レン
ズのＦ値を大きくとり、呑込み角を小さくすれば良いが
画像が暗くなってしまう。However, when the above-mentioned prior art is used in a projection type display device, the contrast ratio becomes low because the scattered light of black display is swallowed by the projection lens. Further, in order to increase the contrast ratio, the F value of the projection lens can be increased and the swallowing angle can be decreased, but the image becomes dark.
【０００４】そこで本発明はこのような問題点を解決す
るもので、その目的とするところはコントラスト比が高
く、明るい表示が可能な投写型液晶表示装置を提供する
ところにある。SUMMARY OF THE INVENTION The present invention aims to solve these problems, and its object is to provide a projection type liquid crystal display device that has a high contrast ratio and is capable of bright display.
【０００５】[0005]
【課題を解決するための手段】本発明の投写型液晶表示
装置は光の透過もしくは散乱により表示を行なう液晶表
示素子を用いた投写型液晶表示装置において、前記液晶
表示素子は有効表示部分以外を厚みを有する光吸収体で
構成したことを特徴とする。[Means for Solving the Problems] A projection type liquid crystal display device of the present invention is a projection type liquid crystal display device using a liquid crystal display element that performs display by transmitting or scattering light, in which the liquid crystal display element has an area other than an effective display area. It is characterized by being made of a thick light absorber.
【０００６】[0006]
【実施例】（実施例１）以下本発明の一実施例を図面に
したがって説明する。[Embodiment] (Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.
【０００７】図１は本発明の投写型表示装置の液晶表示
素子１００の断面図である。液晶表示素子１００に、ア
クティブマトリクス型でスイッチング素子としてＴＦＴ
（Ｔｈｉｎ Ｆｉｌｍ Ｔｒａｎｓｉｓｔｏｒ）を用い
た液晶パネルを用いている。ＴＦＴ基板１上に、ＴＦＴ
２と信号線及び走査線からなる配線３及び画素電極４が
構成され、対向基板５上に対向電極６と光吸収体７が構
成される。そしてこの２枚の基板に高分子分散型液晶８
が挟まれて配置される。高分子分散型液晶８は液晶９及
びスポンジ状高分子１０からなり、本実施例ではネマチ
ック液晶及びＰＭＭＡ（ポリメチルメタクリレート）を
用いた。FIG. 1 is a sectional view of a liquid crystal display element 100 of a projection type display device according to the present invention. The liquid crystal display element 100 includes an active matrix type TFT as a switching element.
(Thin Film Transistor) is used. On the TFT substrate 1, the TFT
2, a wiring 3 consisting of a signal line and a scanning line, and a pixel electrode 4 are formed, and a counter electrode 6 and a light absorber 7 are formed on a counter substrate 5. Polymer dispersed liquid crystal 8 is attached to these two substrates.
are placed between them. The polymer dispersed liquid crystal 8 consists of a liquid crystal 9 and a sponge-like polymer 10, and in this example, nematic liquid crystal and PMMA (polymethyl methacrylate) were used.
【０００８】図２は液晶素子１００の透視図で、光吸収
体７は信号線１１と走査線１２及びＴＦＴ２を覆うよう
に配置され、有効表示部分の画素電極４部分のみ光を透
過させる。なぜなら、通常ＴＦＴ２は光が照射されると
リークを起こし性能が劣化するので、対向基板５側から
光を入射させ、ＴＦＴ２に光が入射しないようにしてい
る。また配線３の部分には電界がかかり不必要な表示を
行なうため、同様に遮光する。FIG. 2 is a perspective view of the liquid crystal element 100, in which the light absorber 7 is arranged to cover the signal line 11, the scanning line 12, and the TFT 2, and allows light to pass through only the pixel electrode 4 portion of the effective display area. This is because normally when the TFT 2 is irradiated with light, leakage occurs and the performance deteriorates, so light is made to enter from the opposing substrate 5 side to prevent light from entering the TFT 2. Further, since an electric field is applied to the wiring 3 and unnecessary display is performed, the wiring 3 is similarly shielded from light.
【０００９】対向基板５側から液晶素子１００に入射し
た光は、画素電極４と対向電極６間において、電圧印加
部では透過し、電圧を印加しない部分では散乱する。ま
た光吸収体７においては吸収される。ここで光吸収体７
はＰｒＭｎＯ３ を用いた。光吸収体７は液晶素子１０
０内部の散乱光を吸収すればよく、逆に入射光を吸収す
ると発熱等の問題が起こるためクロム等の反射金属に積
層するほうがよい。また光を吸収する物質であれば何で
もよく、例えばフルカラー液晶表示装置のカラーフィル
ターと同様な作成方法をとり、フィルターを黒色とすれ
ば良い。。Light incident on the liquid crystal element 100 from the side of the counter substrate 5 is transmitted between the pixel electrode 4 and the counter electrode 6 in the voltage applied portion, and is scattered in the portion to which no voltage is applied. The light is also absorbed in the light absorber 7. Here, the light absorber 7
used PrMnO3. The light absorber 7 is a liquid crystal element 10
It is sufficient to absorb the scattered light inside the 0. Conversely, absorbing incident light causes problems such as heat generation, so it is better to laminate it on a reflective metal such as chromium. Further, any material may be used as long as it absorbs light. For example, the filter may be made black by using the same manufacturing method as the color filter of a full-color liquid crystal display device. .
【００１０】この高分子分散型液晶８はスポンジ状高分
子１０の内部に不連続な状態で液晶９が存在し、その基
本動作は、例えば日経エレクトロニクス１９９０年６月
１１日号１０２頁に示されるように粒状の液晶９の屈折
率をスポンジ状高分子１０に合わせておく。すると電圧
が印加されないときは、界面に沿って液晶分子が配向し
光の入射方向の屈折率が異なるため、反射を繰り返し光
は散乱する。また電圧が印加されるときは、液晶分子が
光の入射方向に配向し屈折率が等しくなるため光が透過
する。In this polymer dispersed liquid crystal 8, the liquid crystal 9 exists in a discontinuous state inside a sponge-like polymer 10, and its basic operation is shown, for example, in Nikkei Electronics June 11, 1990 issue, page 102. The refractive index of the granular liquid crystal 9 is matched to that of the sponge-like polymer 10 as shown in FIG. Then, when no voltage is applied, the liquid crystal molecules are aligned along the interface and the refractive index in the direction of light incidence is different, so the light is repeatedly reflected and scattered. Furthermore, when a voltage is applied, the liquid crystal molecules are aligned in the direction of light incidence and the refractive index becomes equal, allowing light to pass through.
【００１１】また高分子分散型液晶８はＰＮＬＣ（Ｐｏ
ｌｙｍｅｒ−Ｎｅｔｗｏｒｋ Ｌｉｑｕｉｄ Ｃｒｙ
ｓｔａｌ）で置き換えてもよい。これは液晶層に高分子
のネットワークを組んだ構造で、液晶９が連続な状態で
存在し、液晶分子配向の不規則性を利用する。電圧印加
しない状態では液晶分子の配向が不規則なため光は散乱
し、電圧印加状態では配向が均一となり光は透過する。Further, the polymer dispersed liquid crystal 8 is a PNLC (Po
lymer-Network Liquid Cry
stal). This has a structure in which a polymer network is assembled in the liquid crystal layer, in which the liquid crystal 9 exists in a continuous state and takes advantage of the irregular orientation of liquid crystal molecules. When no voltage is applied, the alignment of liquid crystal molecules is irregular and light is scattered, while when a voltage is applied, the alignment is uniform and light is transmitted.
【００１２】図３は光の散乱状態の概念を示す液晶素子
１００の拡大図である。ＴＦＴ基板１の画素電極４と、
対向基板５の対向電極６の間には電界が印加されない状
態で、入射した光は粒状の液晶９で散乱し、その散乱光
は他の粒状の液晶９で再び散乱し、というように散乱を
繰り返し出射側に到達する。このとき散乱を繰り返す光
のうち多くの光は光吸収体７に入射することになり、そ
こで吸収される。そのため液晶素子１００の出射側の光
度分布は破線で示すようになり、光吸収体７の無い場合
の一点鎖線で示される光度分布に比べて小さくなる。す
ると散乱状態において、図４の投写レンズ１４のＦ値に
より定まる呑込み角θに対して呑込まれる光量が小さく
なるため、スクリーン１５上での黒レベルが低下する。
また透過状態においては、白レベルが変わらないのでコ
ントラスト比が高くなる。FIG. 3 is an enlarged view of the liquid crystal element 100 showing the concept of light scattering state. a pixel electrode 4 of a TFT substrate 1;
When no electric field is applied between the opposing electrodes 6 of the opposing substrate 5, the incident light is scattered by the granular liquid crystals 9, the scattered light is again scattered by other granular liquid crystals 9, and so on. Reach the exit side repeatedly. At this time, much of the repeatedly scattered light enters the light absorber 7 and is absorbed there. Therefore, the luminous intensity distribution on the output side of the liquid crystal element 100 becomes as shown by the broken line, which is smaller than the luminous intensity distribution shown by the dashed-dotted line when the light absorber 7 is not provided. Then, in the scattering state, the amount of absorbed light becomes smaller with respect to the swallowing angle θ determined by the F value of the projection lens 14 in FIG. 4, so the black level on the screen 15 decreases. Furthermore, in the transmission state, the white level remains unchanged, so the contrast ratio increases.
【００１３】この現象は画素のピッチが小さくなればな
るほど、光吸収体７の散乱光を吸収する能力が高まるた
め、ハイビジョン対応やさらに高精細になると有利であ
る。さらに一つの画素と一つの画素が光吸収体７により
遮られることになるため、他の画素に影響を与えるクロ
ストークの減少にも効果が大きい。[0013] This phenomenon is advantageous for high-definition applications and higher definition, because the smaller the pixel pitch, the higher the ability of the light absorber 7 to absorb scattered light. Furthermore, since one pixel is blocked by the light absorber 7, it is highly effective in reducing crosstalk that affects other pixels.
【００１４】図４は本発明の概念を示す構成図である。
投写光源１３と液晶表示素子１００と投写レンズ１４か
ら構成される。投写光源１３から出射した光が液晶表示
素子１００において変調され、投写レンズ１４でスクリ
ーン１５上に拡大投写される。光線図は投写レンズ１４
の呑込み角を説明するものであって、液晶表示素子１０
０のあるポイントから出る光は、投写レンズ１４のＦ値
で決まる呑込み角に含まれる光のみがスクリーン１５上
に表れる。黒レベルを下げ、コントラスト比を高めるた
めには、この呑込み角を小さくすれば図３の散乱光をス
クリーン１５上に表示しない。しかし白表示の光量も減
ってしまい明るい表示ができない。また投写光源１３の
平行性を高めれば良いが、点光源が無いため効率よく集
光できないので結局暗くなってしまう。FIG. 4 is a block diagram showing the concept of the present invention. It is composed of a projection light source 13, a liquid crystal display element 100, and a projection lens 14. Light emitted from the projection light source 13 is modulated by the liquid crystal display element 100, and is enlarged and projected onto the screen 15 by the projection lens 14. The ray diagram shows the projection lens 14.
This is to explain the swallowing angle of the liquid crystal display element 10.
Of the light emitted from a certain point of 0, only the light included in the swallowing angle determined by the F value of the projection lens 14 appears on the screen 15. In order to lower the black level and increase the contrast ratio, the scattered light shown in FIG. 3 is not displayed on the screen 15 by reducing this swallowing angle. However, the amount of light for white display also decreases, making it impossible to provide a bright display. Furthermore, although it would be better to improve the parallelism of the projection light source 13, since there is no point light source, the light cannot be efficiently collected, resulting in darkness.
【００１５】図５は本発明の投写型投写型表示装置の構
成図である。基本的には図４と同様であるが、三枚の液
晶表示素子１００を用いている。投写光源１３の光を色
分離系１６において三原色に分離し、それぞれの色ごと
に三枚の液晶表示素子１００で変調し、再び色合成系１
７によりフルカラーに合成され、投写レンズ１４により
拡大投写され、スクリーン１５上に画像表示が行われる
。色分離系１６及び色合成系１７はそれぞれ二枚のダイ
クロイックミラーと反射ミラーから構成されており、波
長特性は任意に決めることができる。FIG. 5 is a block diagram of a projection type display device according to the present invention. Although it is basically the same as FIG. 4, three liquid crystal display elements 100 are used. The light from the projection light source 13 is separated into three primary colors in the color separation system 16, and each color is modulated by three liquid crystal display elements 100, and then the light is sent to the color synthesis system 1 again.
7, the images are combined in full color, enlarged and projected by the projection lens 14, and displayed as an image on the screen 15. The color separation system 16 and the color synthesis system 17 each include two dichroic mirrors and a reflection mirror, and the wavelength characteristics can be arbitrarily determined.
【００１６】なお、液晶表示素子１００はＴＦＴ２によ
る駆動に限らず、ＭＩＭ方式や時分割駆動等のマトリク
スアドレス駆動方式に有効で、光や熱によるアドレス駆
動方式にも有効であることを付け加えておく。It should be noted that the liquid crystal display element 100 is effective not only for driving by the TFT 2 but also for matrix address driving methods such as the MIM method and time division driving, and is also effective for address driving methods using light or heat. .
【００１７】（実施例２）図６は本発明の他の実施例を
示す投写型表示装置の液晶表示素子１００の断面図であ
る。構成は実施例１と同様で、ＴＦＴ２、配線３及び画
素電極４を構成したＴＦＴ基板１と、対向電極６を構成
した対向基板５の間に液晶９及びスポンジ状高分子１０
からなる高分子分散型液晶８が保持される。ここで光吸
収体７はＴＦＴ基板１と対向基板５の均一な間隙を保つ
ためのスペーサーとしての機能を合わせ持つ。液晶表示
装置１００の面内で厚みがバラつくと、コントラスト比
のムラや、明るさのムラが表れ、図５のようなフルカラ
ーの投写型表示装置を構成した場合色ムラとなり画質を
著しく劣化させる。そのためこの光吸収体７は高画質化
に対して多大な効果を持つ。(Embodiment 2) FIG. 6 is a sectional view of a liquid crystal display element 100 of a projection type display device showing another embodiment of the present invention. The configuration is the same as in Example 1, with a liquid crystal 9 and a sponge-like polymer 10 placed between a TFT substrate 1 that includes a TFT 2, wiring 3, and a pixel electrode 4, and a counter substrate 5 that includes a counter electrode 6.
A polymer dispersed liquid crystal 8 consisting of the following is held. Here, the light absorber 7 also functions as a spacer for maintaining a uniform gap between the TFT substrate 1 and the counter substrate 5. If the thickness varies within the plane of the liquid crystal display device 100, uneven contrast ratio and uneven brightness will appear, and when a full-color projection display device as shown in FIG. 5 is configured, color unevenness will occur and the image quality will deteriorate significantly. . Therefore, this light absorber 7 has a great effect on improving image quality.
【００１８】スペーサーの機能を果たすために、材質は
硬度のある絶縁体がよい。一般にはガラス球やプラスチ
ック球が用いられており、光を吸収するように顔料や染
料で黒色に染色すればよい。[0018] In order to perform the function of a spacer, the material is preferably a hard insulator. Generally, glass or plastic bulbs are used, and can be dyed black with pigments or dyes to absorb light.
【００１９】[0019]
【発明の効果】以上述べたように本発明によれば、投写
型表示装置において高分子分散型液晶を用いた液晶表示
素子の有効表示部分以外を光吸収体で構成したことによ
り、ＴＦＴ素子の性能を確保した上で、散乱光を吸収し
コントラスト比の高い画像表示を行えるという効果を有
する。また偏光板が不要となり、投写レンズの飲み込み
角を絞る必要もなくなるため非常に明るい画像表示が行
える。As described above, according to the present invention, in a projection display device, the area other than the effective display portion of the liquid crystal display element using polymer dispersed liquid crystal is constructed with a light absorber. It has the effect of absorbing scattered light and displaying images with a high contrast ratio while ensuring performance. Furthermore, since a polarizing plate is not required and there is no need to narrow down the swallowing angle of the projection lens, extremely bright images can be displayed.
【００２０】さらには、ハイビジョン等の高精細な画像
の場合、画素ピッチが小さくなり、有効表示部分に比べ
て光吸収体の割合が大きくなるため、散乱光をさらに効
率よく吸収することができ、上述した効果はさらに顕著
となる。Furthermore, in the case of high-definition images such as high-definition images, the pixel pitch becomes smaller and the proportion of the light absorber becomes larger compared to the effective display area, so scattered light can be absorbed more efficiently. The above-mentioned effect becomes even more remarkable.
【図１】本発明の投写型表示装置を構成する液晶表示素
子の一実施例を示す断面図である。FIG. 1 is a sectional view showing one embodiment of a liquid crystal display element constituting a projection display device of the present invention.
【図２】本発明の投写型表示装置を構成する液晶表示素
子の一実施例を示す透視図である。FIG. 2 is a perspective view showing one embodiment of a liquid crystal display element constituting the projection display device of the present invention.
【図３】本発明の投写型表示装置を構成する液晶表示素
子を通過する光のふるまいを示した概念図である。FIG. 3 is a conceptual diagram showing the behavior of light passing through a liquid crystal display element constituting the projection display device of the present invention.
【図４】本発明の投写型表示装置の概念を示す構成図で
ある。FIG. 4 is a configuration diagram showing the concept of a projection display device of the present invention.
【図５】本発明の投写型表示装置を液晶表示素子を三枚
用いて、フルカラーとした場合の構成図である。FIG. 5 is a configuration diagram of a projection type display device of the present invention in full color using three liquid crystal display elements.
【図６】本発明の投写型表示装置を構成する液晶表示素
子の他の実施例を示す断面図である。FIG. 6 is a sectional view showing another embodiment of a liquid crystal display element constituting the projection display device of the present invention.
１・・・ＴＦＴ基板 ２・・・ＴＦＴ ３・・・配線 ４・・・画素電極 ５・・・対向基板 ６・・・対向電極 ７・・・光吸収体 ８・・・高分子分散型液晶 ９・・・液晶 １０・・スポンジ状高分子 １１・・信号線 １２・・走査線 １３・・投写光源 １４・・投写レンズ １５・・スクリーン １６・・色分離系 １７・・色合成系 1...TFT substrate 2...TFT 3...Wiring 4... Pixel electrode 5... Opposite board 6...Counter electrode 7...Light absorber 8...Polymer dispersed liquid crystal 9...LCD 10... Sponge-like polymer 11...Signal line 12...Scanning line 13...Projection light source 14...Projection lens 15...Screen 16...Color separation system 17...Color synthesis system
Claims (1)
なう液晶表示素子を用いた投写型液晶表示装置において
、前記液晶表示素子は有効表示部分以外を厚みを有する
光吸収体で構成したことを特徴とする投写型液晶表示装
置。1. A projection type liquid crystal display device using a liquid crystal display element that performs display by transmitting or scattering light, characterized in that the liquid crystal display element is constructed of a thick light absorber except for the effective display portion. A projection type liquid crystal display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3000940A JPH04251222A (en) | 1991-01-09 | 1991-01-09 | Projection type liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3000940A JPH04251222A (en) | 1991-01-09 | 1991-01-09 | Projection type liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04251222A true JPH04251222A (en) | 1992-09-07 |
Family
ID=11487673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3000940A Pending JPH04251222A (en) | 1991-01-09 | 1991-01-09 | Projection type liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04251222A (en) |
-
1991
- 1991-01-09 JP JP3000940A patent/JPH04251222A/en active Pending
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