JPH01102428A - Liquid crystal panel device - Google Patents
Liquid crystal panel deviceInfo
- Publication number
- JPH01102428A JPH01102428A JP62260283A JP26028387A JPH01102428A JP H01102428 A JPH01102428 A JP H01102428A JP 62260283 A JP62260283 A JP 62260283A JP 26028387 A JP26028387 A JP 26028387A JP H01102428 A JPH01102428 A JP H01102428A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal panel
- polarizing plate
- polarizing
- panel device
- 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 66
- 230000010287 polarization Effects 0.000 claims abstract description 16
- 210000002858 crystal cell Anatomy 0.000 claims abstract description 5
- 239000012212 insulator Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000004988 Nematic liquid crystal Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は液晶パネルに関するものであり、特に高出力光
源からの光を制御する液晶パネル装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal panel, and more particularly to a liquid crystal panel device that controls light from a high-output light source.
従来の技術
大画面デイスプレィを得る一方法として、液晶パネルを
ライトバルブとして使用する技術が研究されている（例
えば、液晶 応用編、第２２１頁、培風館）。特に比較
的小さいサイズのねじれネマティック液晶パネルと、投
写レンズを組み合せた投写型大画面デイスプレィ装置で
は、画面を明るくするために高出力光源を使用している
（例えば、ＳＩＤ ８７ ＤＩＧＥＳＴ 第７５
頁）。BACKGROUND OF THE INVENTION As one method of obtaining a large-screen display, a technique of using a liquid crystal panel as a light valve is being researched (for example, Liquid Crystal Applications, p. 221, Baifukan). In particular, large-screen projection display devices that combine a relatively small twisted nematic liquid crystal panel and a projection lens use high-output light sources to brighten the screen (for example, SID 87 DIGEST No. 75).
page).
以下図面を参照しながら、従来の液晶パネルを用いた投
写型大画面デイスプレィの一例について説明する。第３
図はねじれネマティック液晶パネルを用いた投写型大画
面デイスプレィの構成図で、ｌは液晶セル、２は光源側
偏光板、３はスクリーン側偏光板、４は投写レンズ、５
はスクリーン、６は光源、７は反射鏡、８はコンデンサ
レンズである。An example of a projection type large screen display using a conventional liquid crystal panel will be described below with reference to the drawings. Third
The figure shows the configuration of a large projection display using a twisted nematic liquid crystal panel, where l is a liquid crystal cell, 2 is a polarizing plate on the light source side, 3 is a polarizing plate on the screen side, 4 is a projection lens, and 5 is a polarizing plate on the screen side.
is a screen, 6 is a light source, 7 is a reflecting mirror, and 8 is a condenser lens.
以上のように構成された液晶パネルについて、以下その
動作について説明する。The operation of the liquid crystal panel configured as described above will be described below.
液晶パネルは、ねじれネマティック液晶セルと、液晶セ
ルの両側に設けられた偏光板から構成されている０図に
は表示されていないが、信号回路により液晶パネルは、
光の透過率分布を制御され、画像が形成される。液晶パ
ネル上に形成された画像は、投写レンズによりスクリー
ン上に拡大投影される。The liquid crystal panel consists of a twisted nematic liquid crystal cell and polarizing plates provided on both sides of the liquid crystal cell.Although it is not shown in the diagram, the liquid crystal panel is
An image is formed by controlling the light transmittance distribution. The image formed on the liquid crystal panel is enlarged and projected onto a screen by a projection lens.
発明が解決しようとする問題点
しかしながら上記の様な構成では、明るい画像を得るた
めに、高出力光源を用いる必要があるが、ランプなどの
通常の光源から出力される光はその偏光が円偏光か楕円
偏光であるため、その光エネルギーのおよそ半分は光源
側の偏光板で吸収される。吸収された光エネルギーは、
熱エネルギーに変換され、液晶を加熱する。ところが、
液晶は温度変化によりその特性が大きく変化し、液晶パ
ネルのライトバルブとしての性能が著しく低下する。Problems to be Solved by the Invention However, in the above configuration, it is necessary to use a high-output light source in order to obtain a bright image, but the polarization of the light output from a normal light source such as a lamp is circularly polarized. Since the light is elliptically polarized, approximately half of its light energy is absorbed by the polarizing plate on the light source side. The absorbed light energy is
It is converted into thermal energy and heats the liquid crystal. However,
The characteristics of liquid crystals change significantly due to temperature changes, and the performance of liquid crystal panels as light valves deteriorates significantly.
更に、高温では液晶としての性質を失い、ライトバルブ
として機能しなくなる。Furthermore, at high temperatures, it loses its properties as a liquid crystal and ceases to function as a light valve.
本発明はかかる点に鑑みてなされたもので、高出力光源
を用いても液晶の温度上昇を抑えることのできる液晶パ
ネル装置を提供することを目的としている。The present invention has been made in view of this point, and an object of the present invention is to provide a liquid crystal panel device that can suppress the temperature rise of liquid crystal even when a high-output light source is used.
問題点を解決するための手段
上記問題点を解決するため、本発明の液晶パネル装置は
、光源と液晶パネルの間に偏光手段を追加し、追加した
偏光手段と液晶パネルとを断熱するようにしたものであ
る。Means for Solving the Problems In order to solve the above problems, the liquid crystal panel device of the present invention includes additional polarizing means between the light source and the liquid crystal panel, and heat insulation between the added polarizing means and the liquid crystal panel. This is what I did.
作用
上記構成によれば、光エネルギーは追加した偏光手段で
吸収或いは反射されるが、追加した偏光手段と液晶パネ
ルとは断熱されているので、高出力光源を用いても液晶
の温度が上昇しない液晶パネル装置を提供できる。Effect: According to the above configuration, light energy is absorbed or reflected by the added polarizing means, but since the added polarizing means and the liquid crystal panel are insulated, the temperature of the liquid crystal does not rise even when a high output light source is used. We can provide liquid crystal panel devices.
実施例
以下本発明の一実施例の液晶パネル装置について添付図
面を参照しながら説明する。Embodiment A liquid crystal panel device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図は本発明の一実施例における液晶パネル装置の構
成図を示したものである。第１図において、９は追加し
た偏光板で、その他の構成は第３図と同じである。追加
した偏光板９の偏光軸は、液晶パネルの光源側偏光板２
の偏光軸と同方向に設定する。追加した偏光板９と光源
側偏光板２の間には空気層が設けられ、断熱体として作
用する。FIG. 1 shows a configuration diagram of a liquid crystal panel device according to an embodiment of the present invention. In FIG. 1, 9 is an added polarizing plate, and the other configurations are the same as in FIG. 3. The polarization axis of the added polarizing plate 9 is the polarizing plate 2 on the light source side of the liquid crystal panel.
Set in the same direction as the polarization axis of An air layer is provided between the added polarizing plate 9 and the light source side polarizing plate 2, and acts as a heat insulator.
本発明の作用を以下に説明する。The operation of the present invention will be explained below.
光源６から発光される光は、通常のランプなどでは円偏
光ないし楕円偏光であり、液晶パネルの光源側偏光板の
偏光軸に平行な偏光成分の他に、垂直な偏光成分も含ん
でいる。第１図の構成においては、この垂直成分は追加
した偏光板で吸収され、熱に変換されるが、追加した偏
光板は液晶パネルとは空気層により断熱されているので
、液晶パネルの温度は上昇しない。The light emitted from the light source 6 is circularly polarized light or elliptically polarized light in a normal lamp, and includes a perpendicular polarized light component in addition to a polarized light component parallel to the polarization axis of the polarizing plate on the light source side of the liquid crystal panel. In the configuration shown in Figure 1, this vertical component is absorbed by the added polarizing plate and converted into heat, but since the added polarizing plate is insulated from the liquid crystal panel by an air layer, the temperature of the liquid crystal panel is It doesn't rise.
空気層は完全な断熱体ではないので、層の厚さを十分に
とることが好ましい、或いは強制的な手段、例えば送風
機で空気を循環させることも望ましい。Since the air layer is not a perfect insulator, it is preferable that the layer be sufficiently thick, or that the air be circulated by forced means, such as a blower.
液晶パネルの光源側偏光板と追加した偏光板の両側光軸
が完全に一致する時には、液晶パネルの偏光板を除外し
た構成も考えられるが、−枚の偏先板で耐熱性と高偏光
度を両立させることは難しく、偏光度低下による画質低
下と光源出力低下による明るさ低下との妥協を計ったも
のにならざるを得ない。追加した偏光板に耐熱性の高い
ものを用い、液晶パネルの偏光板に高偏光度のものを用
いた構成にすることにより、前述の画質低下と明るさ低
下とを同時に解決できることから、本実施例の構成の方
が好ましい。When the optical axes of the light source side polarizing plate of the liquid crystal panel and the added polarizing plate match perfectly, a configuration in which the polarizing plate of the liquid crystal panel is excluded can be considered, but heat resistance and a high degree of polarization can be achieved with just one polarizing plate. It is difficult to achieve both, and a compromise must be made between a decrease in image quality due to a decrease in the degree of polarization and a decrease in brightness due to a decrease in light source output. By using an additional polarizing plate with high heat resistance and using a polarizing plate with a high polarization degree for the liquid crystal panel, the above-mentioned image quality deterioration and brightness deterioration can be solved at the same time. The example configuration is preferred.
本実施例の液晶は、ねじれネマティックであるが、偏光
板と組み合して機能する液晶パネルであれば他の液晶で
あってもよいことは言うまでもない。Although the liquid crystal in this embodiment is twisted nematic, it goes without saying that any other liquid crystal may be used as long as it functions as a liquid crystal panel in combination with a polarizing plate.
以下本発明の第二の実施例の液晶パネル装置について添
付図面を参照しながら説明する。A liquid crystal panel device according to a second embodiment of the present invention will be described below with reference to the accompanying drawings.
第２図は本発明の一実施例における液晶パネル装置の構
成図を示したものである。第２図において、ｌＯは追加
した偏光ビームスプリッタで、その他の構成は第３図と
同じである。液晶パネルの光源側偏光板２の偏光軸と同
方向の偏光を持つ光が通過するように、偏光ビームスプ
リッタ１０を設定する。FIG. 2 shows a configuration diagram of a liquid crystal panel device according to an embodiment of the present invention. In FIG. 2, lO is an added polarizing beam splitter, and the other configurations are the same as in FIG. 3. The polarizing beam splitter 10 is set so that light having a polarization in the same direction as the polarization axis of the light source side polarizing plate 2 of the liquid crystal panel passes through.
本発明の作用を以下に説明する。The operation of the present invention will be explained below.
光源からの光のなかでＰ偏光成分のみが、偏光ビームス
プリッタＩＯを透過し、液晶パネルの偏光板２に入射す
るが、その偏光軸はＰ偏光と同じ方向であり、Ｓ偏光吸
収による発熱はない。従って液晶パネルの温度上昇は生
じない。Of the light from the light source, only the P-polarized component passes through the polarizing beam splitter IO and enters the polarizing plate 2 of the liquid crystal panel, but its polarization axis is in the same direction as the P-polarized light, and the heat generated by absorption of the S-polarized light is do not have. Therefore, the temperature of the liquid crystal panel does not rise.
偏光ビームスプリッタを反射するＳ偏光が液晶パネルに
入射し、且つＳ偏光と同じ方向に液晶パネルの偏光板の
偏光軸を設定することにより、本実施例と同様の効果が
得られる。By making the S-polarized light reflected by the polarizing beam splitter incident on the liquid crystal panel and setting the polarization axis of the polarizing plate of the liquid crystal panel in the same direction as the S-polarized light, the same effect as in this embodiment can be obtained.
発明の効果
−以上述べたごとく本発明は、光源と液晶パネルの間に
偏光手段を追加し、追加した偏光手段を液晶パネルと断
熱したことにより、従来偏光板の光吸収のため生じてい
た液晶パネルの温度上昇を抑制できるという効果がある
。Effects of the invention - As described above, the present invention adds a polarizing means between the light source and the liquid crystal panel and insulates the added polarizing means from the liquid crystal panel. This has the effect of suppressing the temperature rise of the panel.
第１図は本発明の一実施例における液晶パネル装置を用
いた投写型大画面デイスプレィ装置の構成図、第２図は
本発明の第二の実施例における液晶パネル装置を用いた
投写型大画面デイスプレィ装置の構成図、第３図は従来
の液晶パネルを用いた投射型大画面デイスプレィ装置の
構成図である。
２・・・・・・光源側偏光板、９・・・・・・追加した
偏光板、１０・・・・・・偏光ビームスプリッタ。FIG. 1 is a block diagram of a projection type large screen display device using a liquid crystal panel device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a projection type large screen display device using a liquid crystal panel device according to a second embodiment of the present invention. FIG. 3 is a block diagram of a projection type large screen display device using a conventional liquid crystal panel. 2... Light source side polarizing plate, 9... Added polarizing plate, 10... Polarizing beam splitter.
Claims (10)
源の間に、偏光手段を有する構成にしたことを特徴とす
る液晶パネル装置。(1) A liquid crystal panel device characterized in that a polarizing means is provided between a liquid crystal panel composed of a polarizing plate and a liquid crystal cell and a light source.
の光源側偏光板の偏光軸とをおよそ同方向としたことを
特徴とする特許請求の範囲第（１）項記載の液晶パネル
装置。(2) The liquid crystal panel device according to claim (1), characterized in that the polarization direction of the light passing through the polarizing means and the polarization axis of the light source side polarizing plate of the liquid crystal panel are approximately the same direction. .
ることを特徴とする特許請求の範囲第（２）項記載の液
晶パネル装置。(3) The liquid crystal panel device according to claim (2), wherein the polarizing means is comprised of at least one polarizing plate.
ことを特徴とする特許請求の範囲第（２）項記載の液晶
パネル装置。(4) The liquid crystal panel device according to claim (2), wherein the polarizing means is constituted by a polarizing beam splitter.
置したことを特徴とする特許請求の範囲第（３）項記載
の液晶パネル装置。(5) The liquid crystal panel device according to claim (3), characterized in that a heat insulator is disposed between the added polarizing plate and the liquid crystal panel.
設けたことを特徴とする特許請求の範囲第（５）項記載
の液晶パネル装置。(6) The liquid crystal panel device according to claim (5), characterized in that an air layer of at least several millimeters is provided as a heat insulator.
を特徴とする特許請求の範囲第（６）項記載の液晶パネ
ル装置。(7) The liquid crystal panel device according to claim (6), further comprising means for forced air convection.
用いることを特徴とする特許請求の範囲第（７）項記載
の液晶パネル装置。(8) The liquid crystal panel device according to claim (7), wherein a blower is used as the means for forcing air to convect.
する偏光板は高耐熱性のものとしたことを特徴とする特
許請求の範囲第（３）項記載の液晶パネル装置。(9) The liquid crystal panel device according to claim (3), wherein the polarizing plate of the liquid crystal panel has a high degree of polarization, and the additional polarizing plate has a high heat resistance.
とを特徴とする特許請求の範囲第（４）項記載の液晶パ
ネル装置。(10) The liquid crystal panel device according to claim (4), wherein the polarizing plate of the liquid crystal panel has a high degree of polarization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62260283A JPH01102428A (en) | 1987-10-15 | 1987-10-15 | Liquid crystal panel device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62260283A JPH01102428A (en) | 1987-10-15 | 1987-10-15 | Liquid crystal panel device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01102428A true JPH01102428A (en) | 1989-04-20 |
Family
ID=17345895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62260283A Pending JPH01102428A (en) | 1987-10-15 | 1987-10-15 | Liquid crystal panel device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01102428A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02128127U (en) * | 1989-03-29 | 1990-10-23 | ||
| US5570210A (en) * | 1993-05-06 | 1996-10-29 | Fujitsu Limited | Liquid crystal display device with directional backlight and image production capability in the light scattering mode |
| US5570209A (en) * | 1990-09-18 | 1996-10-29 | Mitsubishi Denki Kabushiki Kaisha | Color projection type display apparatus having three liquid crystal displays of same structure |
| JP2003084271A (en) * | 2001-09-14 | 2003-03-19 | Fujitsu Ltd | Liquid crystal display device |
| WO2007086102A1 (en) * | 2006-01-24 | 2007-08-02 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Plant control system control program creation/display device |
-
1987
- 1987-10-15 JP JP62260283A patent/JPH01102428A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02128127U (en) * | 1989-03-29 | 1990-10-23 | ||
| US5570209A (en) * | 1990-09-18 | 1996-10-29 | Mitsubishi Denki Kabushiki Kaisha | Color projection type display apparatus having three liquid crystal displays of same structure |
| US5691785A (en) * | 1990-09-18 | 1997-11-25 | Mitsubishi Denki Kabushiki Kaisha | Color projection type display apparatus having three liquid displays of same structure |
| US5570210A (en) * | 1993-05-06 | 1996-10-29 | Fujitsu Limited | Liquid crystal display device with directional backlight and image production capability in the light scattering mode |
| JP2003084271A (en) * | 2001-09-14 | 2003-03-19 | Fujitsu Ltd | Liquid crystal display device |
| WO2007086102A1 (en) * | 2006-01-24 | 2007-08-02 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Plant control system control program creation/display device |
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