JPH0361927A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH0361927A JPH0361927A JP1197629A JP19762989A JPH0361927A JP H0361927 A JPH0361927 A JP H0361927A JP 1197629 A JP1197629 A JP 1197629A JP 19762989 A JP19762989 A JP 19762989A JP H0361927 A JPH0361927 A JP H0361927A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- light
- optical path
- display element
- 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 50
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000003491 array Methods 0.000 claims abstract description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、液晶表示素子に光を透過させて画像を形成す
る液晶表示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 liquid crystal display device that forms an image by transmitting light through a liquid crystal display element.
液晶表示装置は、投射方式などによりスクリーンに大画
面表示をおこなう際に有効な装置である。この装置は例
えば第６図に示すような構成で実現することが出来る。A liquid crystal display device is an effective device for displaying a large screen on a screen using a projection method or the like. This device can be realized with a configuration as shown in FIG. 6, for example.
ハロゲンランプやキセノンランプ等の光源１０からの光
を、ＴＮ（ツィステッドネマティック〉型液晶等を用い
て画像を形成する液晶表示素子２を透過させ、投射レン
ズ１１によりスクリーン１２に拡大投影することにより
画像を構成する。このような構成では、小型の液晶表示
素子によってＴＶ画像等を大画面で再生できると言う特
徴がある。By transmitting light from a light source 10 such as a halogen lamp or a xenon lamp through a liquid crystal display element 2 that forms an image using a TN (twisted nematic) type liquid crystal or the like, the light is enlarged and projected onto a screen 12 by a projection lens 11. This configuration has the feature that TV images and the like can be reproduced on a large screen using a small liquid crystal display element.
液晶表示素子は、電極が形成された２枚の透明基板で液
晶を挾持した構造になっており、表示に与る領域は区画
・細分化されて複数の表示画素構成になっている。A liquid crystal display element has a structure in which a liquid crystal is sandwiched between two transparent substrates on which electrodes are formed, and the display area is divided and subdivided into a plurality of display pixels.
ところで、一般に液晶表示素子の各表示画素１５は、第
７図に示すように実際に液晶に電圧を加えて画素を表示
する液晶表示部分１３と、液晶表示部分１３を駆動する
ための薄膜トランジスタ等の駆動回路部分１４とで構成
されている。実際に光の透過率を変えて表示画素となる
のは液晶表示部分１３のみであり、駆動回路部分１４は
透過光に対しては損失となる。By the way, each display pixel 15 of a liquid crystal display element generally includes a liquid crystal display part 13 that actually applies voltage to the liquid crystal to display the pixel, and a thin film transistor or the like for driving the liquid crystal display part 13, as shown in FIG. It is composed of a drive circuit section 14. It is only the liquid crystal display portion 13 that actually changes the light transmittance and becomes a display pixel, and the drive circuit portion 14 causes a loss for transmitted light.
液晶表示素子の高精細化等を進めると、各表示画素内で
の駆動回路部分の比率が増す傾向となり、液晶表示素子
全体としての光利用率が低下してしまう。投射型の表示
装置では、スクリーン上での明るさが重要な性能である
ため、光利用率の低下は装置性能の劣化となってしはう
問題が生じる。As the resolution of liquid crystal display elements increases, the ratio of the drive circuit portion within each display pixel tends to increase, resulting in a decrease in the light utilization efficiency of the liquid crystal display element as a whole. In a projection type display device, since the brightness on the screen is an important performance, a decrease in the light utilization rate causes a problem in that the device performance deteriorates.
また、アモルファスシリコンを材料とする薄膜トランジ
スタでは、光照射によりキャリヤが励起されてしまうこ
とにより、トランジスタ特性が変化してしまうため、光
源の強度が制限されてしまうという問題点もある。In addition, in a thin film transistor made of amorphous silicon, carriers are excited by light irradiation, which changes the transistor characteristics, resulting in a problem that the intensity of the light source is limited.
本発明の液晶表示装置は、光源からの出射光を液晶表示
素子を透過させて前記液晶表示素子の像を形成する液晶
表示装置において、前記液晶表示素子の前面及び後面に
光路変換素子のアレイが設置されており、前記一対の光
路変換素子は前記液晶表示素子の液晶表示部分にのみ光
を透過させる機能を有することを特徴とする。The liquid crystal display device of the present invention is a liquid crystal display device in which light emitted from a light source is transmitted through a liquid crystal display element to form an image of the liquid crystal display element, and an array of optical path conversion elements is provided on the front and rear surfaces of the liquid crystal display element. The pair of optical path conversion elements have a function of transmitting light only to the liquid crystal display portion of the liquid crystal display element.
第１図の実施例を用いて本発明の詳細な説明する。 The present invention will be explained in detail using the embodiment shown in FIG.
液晶表示素子２の両側に光路変換素子アレイ１が設置さ
れている。光路変換素子としては、プリズムを使用する
ことが出来る。この構成においては、光は図中の矢印の
ような光路をたどるため、液晶表示素子内で光が透過す
るのは斜線の部分のみである。従って、光の透過しない
領域に駆動回路部分を設置することにより、光量損失の
無い構成を実現することが可能となる。液晶表示部分へ
の入射角度は２方向のみであるため、透過光のコントラ
ストはこの２方向においてのみ考慮すればよい。また、
このようなプリズムは密に配置することが可能なため、
光路変換素子アレイにおける光量損失を生じることはな
い。さらに、このようなプリズムアレイは、プラスチッ
ク成形等により容易に形成することが出来る。Optical path conversion element arrays 1 are installed on both sides of the liquid crystal display element 2. A prism can be used as the optical path conversion element. In this configuration, the light follows an optical path as indicated by the arrow in the figure, so that the light passes through only the diagonally shaded areas within the liquid crystal display element. Therefore, by installing the drive circuit portion in a region through which no light passes, it is possible to realize a configuration without loss of light amount. Since there are only two angles of incidence on the liquid crystal display portion, the contrast of transmitted light only needs to be considered in these two directions. Also,
Since such prisms can be arranged closely,
No loss of light quantity occurs in the optical path conversion element array. Furthermore, such a prism array can be easily formed by plastic molding or the like.
第１図に示すような、液晶表示素子２を光路変換素子ア
レイ１で挟み込んだ素子を、第６図の液晶表示素子２の
代わりに設置することで、光量損失の少ない液晶表示装
置を実現することが出来る。By installing an element in which a liquid crystal display element 2 is sandwiched between an optical path conversion element array 1 as shown in Fig. 1 in place of the liquid crystal display element 2 shown in Fig. 6, a liquid crystal display device with low light loss is realized. I can do it.
第２図は、光路変換素子を液晶表示素子の基板３として
用いた実施例であり、光路変換素子アレイの設置精度を
向上させることが出来る。FIG. 2 shows an embodiment in which an optical path changing element is used as the substrate 3 of a liquid crystal display element, and the installation accuracy of the optical path changing element array can be improved.
第３図は光路変換方向を１方向に限定した実施例である
。この実施例では液晶表示素子２への入射方向が１方向
になるため、さらに液晶表示素子の設計が容易になる。FIG. 3 shows an embodiment in which the optical path changing direction is limited to one direction. In this embodiment, since the incident direction to the liquid crystal display element 2 is one direction, the design of the liquid crystal display element is further facilitated.
光路変換素子として４角錐を並べた第４図の構成も考え
られる。この実施例では、液晶表示素子内で光の透過す
る部分の割合をさらに減少させることが出来る。The configuration shown in FIG. 4 in which four pyramids are arranged as optical path converting elements is also considered. In this embodiment, it is possible to further reduce the proportion of the portion of the liquid crystal display element through which light passes.
第５図は光路変換素子として１方向にのみ高い回折効率
が得られるブレーズ型の回折格子を使用した実施例であ
る。光路変換素子の薄型化が可能である。FIG. 5 shows an example in which a blazed diffraction grating that can obtain high diffraction efficiency only in one direction is used as the optical path conversion element. It is possible to make the optical path conversion element thinner.
本発明により、光利用率が高く、表示画面の明るい液晶
表示装置を得ることが出来る。According to the present invention, a liquid crystal display device with a high light utilization efficiency and a bright display screen can be obtained.
第１図〜第５図は本発明の実施例の示す図、第６図は従
来の液晶表示装置を示す図、第７図は液晶表示素子の構
成を示す図である。
１・・・光路変換素子アレイ、２・・・液晶表示素子、
３・・・基板、１０・・・光源、１１・・・投射レンズ
、１２・・・スクリーン、１３・・・液晶表示部分、１
４・・・駆動回路部分、１５・・・表示画素。
である。1 to 5 are diagrams showing an embodiment of the present invention, FIG. 6 is a diagram showing a conventional liquid crystal display device, and FIG. 7 is a diagram showing the structure of a liquid crystal display element. 1... Optical path conversion element array, 2... Liquid crystal display element,
3... Substrate, 10... Light source, 11... Projection lens, 12... Screen, 13... Liquid crystal display portion, 1
4...Drive circuit portion, 15...Display pixel. It is.
Claims (1)
表示素子と、液晶表示素子に光を照射する光源と、液晶
表示素子の表示画像をスクリーン上に投射する光学系と
を少くとも具備する液晶表示装置において、前記液晶表
示素子の前面及び後面に光路変換素子アレイが設置され
ており、前記一対の光路変換素子は前記液晶表示素子内
の、透過光特性を変化させて画素表示を行なう液晶表示
部分にのみ光を透過させる機能を有することを特徴とす
る液晶表示装置。It includes at least a liquid crystal display element in which a liquid crystal is sandwiched between two transparent substrates on which electrodes are formed, a light source that irradiates light to the liquid crystal display element, and an optical system that projects a display image of the liquid crystal display element onto a screen. In the liquid crystal display device, optical path conversion element arrays are installed on the front and rear surfaces of the liquid crystal display element, and the pair of optical path conversion elements perform pixel display by changing transmitted light characteristics within the liquid crystal display element. A liquid crystal display device characterized by having a function of transmitting light only to a liquid crystal display portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1197629A JPH0361927A (en) | 1989-07-28 | 1989-07-28 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1197629A JPH0361927A (en) | 1989-07-28 | 1989-07-28 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0361927A true JPH0361927A (en) | 1991-03-18 |
Family
ID=16377664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1197629A Pending JPH0361927A (en) | 1989-07-28 | 1989-07-28 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0361927A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1073818A (en) * | 1996-09-02 | 1998-03-17 | Dainippon Printing Co Ltd | Color display device using diffraction grating |
| US5844638A (en) * | 1992-10-09 | 1998-12-01 | Ag Technology Co., Ltd. | Light source apparatus using a cone-shaped element and an applied apparatus thereof |
| US6344886B2 (en) * | 1998-09-22 | 2002-02-05 | Stanley Electric Co., Ltd. | Light guide device enhancing a polarized component and liquid crystal display device |
| US6905262B2 (en) | 2001-09-26 | 2005-06-14 | Nec Compound Semiconductor Devices, Ltd. | Semiconductor device for optically coupling semiconductor light-emitting device to optical fiber |
| JP2005181607A (en) * | 2003-12-18 | 2005-07-07 | Seiko Epson Corp | Spatial light modulator and projector |
-
1989
- 1989-07-28 JP JP1197629A patent/JPH0361927A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5844638A (en) * | 1992-10-09 | 1998-12-01 | Ag Technology Co., Ltd. | Light source apparatus using a cone-shaped element and an applied apparatus thereof |
| JPH1073818A (en) * | 1996-09-02 | 1998-03-17 | Dainippon Printing Co Ltd | Color display device using diffraction grating |
| US6344886B2 (en) * | 1998-09-22 | 2002-02-05 | Stanley Electric Co., Ltd. | Light guide device enhancing a polarized component and liquid crystal display device |
| US6905262B2 (en) | 2001-09-26 | 2005-06-14 | Nec Compound Semiconductor Devices, Ltd. | Semiconductor device for optically coupling semiconductor light-emitting device to optical fiber |
| JP2005181607A (en) * | 2003-12-18 | 2005-07-07 | Seiko Epson Corp | Spatial light modulator and projector |
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