JPH0519256A - Projection type liquid crystal display device - Google Patents
Projection type liquid crystal display deviceInfo
- Publication number
- JPH0519256A JPH0519256A JP3168547A JP16854791A JPH0519256A JP H0519256 A JPH0519256 A JP H0519256A JP 3168547 A JP3168547 A JP 3168547A JP 16854791 A JP16854791 A JP 16854791A JP H0519256 A JPH0519256 A JP H0519256A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- display element
- projection
- light source
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
Landscapes
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示素子の表示画
像をスクリーン面に拡大投影する投射型液晶表示装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type liquid crystal display device for enlarging and projecting a display image of a liquid crystal display element on a screen surface.
【０００２】[0002]
【従来の技術】投射型液晶表示装置は、図２に示すよう
に、光源２１からの投射光２７で液晶表示素子２２を照
明し、投射レンズ２３により液晶表示素子２２の表示画
像をスクリーン上に拡大投影するものである。液晶表示
素子２２にツイステッド・ネマティック（ＴＮ）液晶が
用いられる場合、画像形成のためには偏光子２４、検光
子２５が光源２１と液晶表示素子２２、および液晶表示
素子２２と投射レンズ２３の間の光路中にそれぞれ配置
される。また、高コントラストで高品質の投射画像を得
るには、液晶表示素子２２の各画素にスイッチング素子
が形成されたアクティブマトリクス型の液晶表示素子２
２が用いられる。このような投射型液晶表示装置は、小
型の装置で任意の大きさの大画面映像を容易に得ること
ができるという利点がある。2. Description of the Related Art As shown in FIG. 2, a projection type liquid crystal display device illuminates a liquid crystal display element 22 with a projection light 27 from a light source 21, and a projection lens 23 displays a display image of the liquid crystal display element 22 on a screen. It is an enlarged projection. When a twisted nematic (TN) liquid crystal is used for the liquid crystal display element 22, a polarizer 24 and an analyzer 25 are provided between the light source 21 and the liquid crystal display element 22, and between the liquid crystal display element 22 and the projection lens 23 for image formation. Are arranged in the optical path of each. Further, in order to obtain a high-contrast projected image with high contrast, an active matrix type liquid crystal display element 2 in which a switching element is formed in each pixel of the liquid crystal display element 22.
2 is used. Such a projection type liquid crystal display device has an advantage that a large screen image of an arbitrary size can be easily obtained with a small device.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の投射型
液晶表示装置において、液晶表示素子は直線偏光光で照
明する必要があるため、不定偏光光である光源からの投
射光を、偏光子を用いて直線偏光光に変換しなければな
らない。その変換効率は４０％以下と低く、結果として
投射画面は暗くならざるを得ない。さらに、アクティブ
マトリクス型の液晶表示素子を用いる場合、スイッチン
グ素子、および配線部分は光が透過しないため、投射画
面は非常に暗くなる。したがって、従来の投射型液晶表
示装置では、明るい投射画面を得るために、輝度の高い
光源を使用している。However, in the conventional projection type liquid crystal display device, since the liquid crystal display element needs to be illuminated by linearly polarized light, the projection light from the light source, which is indefinitely polarized light, is emitted by the polarizer. Must be used to convert to linearly polarized light. The conversion efficiency is as low as 40% or less, and as a result, the projection screen has to be dark. Further, when an active matrix type liquid crystal display element is used, light is not transmitted through the switching element and the wiring portion, so that the projection screen becomes very dark. Therefore, in the conventional projection type liquid crystal display device, a light source with high brightness is used in order to obtain a bright projection screen.
【０００４】従来の投射型液晶表示装置に、このような
高輝度の光源を用いた場合、以下に示す問題点があっ
た。強い光で液晶表示素子を照明すると、照明光の一部
は液晶表示素子で吸収せれ、液晶表示素子の温度が上昇
する。一般に照明光は中心部の強度が強いため、液晶表
示素子は周辺部より中央部の温度が高いという面内温度
分布を有することになる。液晶表示素子を均一な照度分
布で証明しても、液晶表示素子の周辺部は、ケースや取
付治具等で遮光されることや、ケースや取付治具への熱
伝導による冷却効果が作用することにより周辺部の温度
は中央部に比べて上昇しない。液晶表示素子にこのよう
な面内温度分布があると、液晶表示素子を構成するガラ
ス基板は、場所による熱膨張の違いから歪が生じる。ガ
ラス基板に歪が生じると光弾性効果によりガラス基板
は、光学的異方性になり複屈折を主屈折率軸は歪による
主応力方向と一致するので、ガラス基板の面内温度分布
が、中央部が高く周辺部が低いという同心円状の分布の
場合、ガラス基板面内において動径方向と接線方向に複
屈折の異方軸が生じる。ガラス基板にこのような複屈折
分布がある液晶表示素子を拡大投影すると、液晶表示素
子の画像形成のために配置された偏光子、検光子の偏光
軸とガラス基板に発生した複屈折の異方軸が平行、また
は直交する場所では投射画像の特性に変化が生じない
が、それ以外の場所、特に４５度で交わる場所の近傍で
は、ガラス基板の複屈折が液晶で実現している複屈折を
増加、または補償するように作用するため、投射画像の
特性に変化が生じる。したがって、投射画像の面内にお
いて場所により中間調特性やコントラストが異なるとい
う表示むらが生じるという問題点があった。When such a high-luminance light source is used in the conventional projection type liquid crystal display device, there are the following problems. When the liquid crystal display element is illuminated with strong light, part of the illumination light is absorbed by the liquid crystal display element, and the temperature of the liquid crystal display element rises. In general, since the intensity of illumination light at the central portion is high, the liquid crystal display element has an in-plane temperature distribution in which the temperature at the central portion is higher than that at the peripheral portion. Even if the liquid crystal display element is proved with a uniform illuminance distribution, the peripheral part of the liquid crystal display element is shielded from light by the case and the mounting jig, and the cooling effect by heat conduction to the case and the mounting jig works. As a result, the temperature in the peripheral portion does not rise as compared with the temperature in the central portion. When the liquid crystal display element has such an in-plane temperature distribution, the glass substrate forming the liquid crystal display element is distorted due to the difference in thermal expansion depending on the location. When strain occurs in the glass substrate, the glass substrate becomes optically anisotropic due to the photoelastic effect, and birefringence coincides with the principal stress direction due to strain in the main refractive index axis. In the case of the concentric distribution in which the portion is high and the peripheral portion is low, biaxial birefringent anisotropic axes occur in the radial direction and the tangential direction in the glass substrate plane. When a liquid crystal display device having such a birefringence distribution is magnified and projected on a glass substrate, the polarizer arranged for image formation of the liquid crystal display device, the polarization axis of the analyzer and the anisotropy of the birefringence generated on the glass substrate. There is no change in the characteristics of the projected image in the place where the axes are parallel or orthogonal, but in other places, especially in the vicinity of the place where the axes intersect at 45 degrees, the birefringence of the glass substrate causes the birefringence realized by the liquid crystal. Since it acts to increase or compensate, a change occurs in the characteristics of the projected image. Therefore, there is a problem in that display unevenness occurs in which the halftone characteristics and the contrast are different depending on the location in the plane of the projected image.
【０００５】本発明の目的は、輝度の高い光源を使用し
ても、液晶表示素子の面内温度分布を均一にすることが
でき、ガラス基板の複屈折に起因する表示むらが投射面
像に生じない、すなわち高画質で明るい投射画像を得る
ことができる投射型液晶表示装置を提供することにあ
る。An object of the present invention is to make the in-plane temperature distribution of a liquid crystal display element uniform even if a light source having high brightness is used, and display unevenness caused by birefringence of a glass substrate on a projection surface image. An object of the present invention is to provide a projection-type liquid crystal display device that does not occur, that is, can obtain a high quality and bright projection image.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の投射型液晶表示装置は、液晶表示素子と、
この液晶表示素子の表示画像をスクリーン面に投影する
ための光源および投射レンズとから構成される投射液晶
表示装置において、前記液晶表示素子の周辺部を加熱す
る発熱体を、前記液晶表示素子の周辺部に接するように
配置したことを特徴としている。In order to achieve the above object, a projection type liquid crystal display device of the present invention comprises a liquid crystal display element,
In a projection liquid crystal display device comprising a light source and a projection lens for projecting a display image of the liquid crystal display element on a screen surface, a heating element for heating a peripheral portion of the liquid crystal display element is provided around the liquid crystal display element. The feature is that it is placed so as to contact the part.
【０００７】[0007]
【作用】本発明の上記構成によれば、発熱体を液晶表示
素子の外周部に接するように配置し、液晶表示素子の周
辺部を加熱することにより、輝度の高い光源を使用した
場合に生じる、液晶表示素子の中央部の温度が高く周辺
部の温度が低くなるという面内温度分布を均一にし、ガ
ラス基板の歪を低減することができる。したがって、ガ
ラス基板の複屈折に起因する表示むらが投射画像に生じ
ない、すなわち高画質で明るい投射画像を得ることがで
きる投射型液晶表示装置が可能になる。According to the above structure of the present invention, the heating element is arranged so as to be in contact with the outer peripheral portion of the liquid crystal display element, and the peripheral portion of the liquid crystal display element is heated. The in-plane temperature distribution in which the temperature of the central portion of the liquid crystal display element is high and the temperature of the peripheral portion thereof is low can be made uniform, and distortion of the glass substrate can be reduced. Therefore, it is possible to provide a projection type liquid crystal display device in which display unevenness due to birefringence of the glass substrate does not occur in the projected image, that is, a high quality and bright projected image can be obtained.
【０００８】[0008]
【実施例】以下、本発明の実施例について図面を参照し
て説明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】図１は、本発明の実施例を示す投射型液晶
表示装置の斜視図である。この投射型液晶表示装置は、
液晶表示素子２と、液晶表示素子２を照明するための光
源１と、液晶表示素子２の表示画像をスクリーンに拡大
投影するための投射レンズ３と、光源１と液晶表示素子
２の間の光路中に配置した偏光子４と、液晶表示素子２
と投射レンズ３との間の光路中に配置した検光子５と、
液晶表示素子２の周辺部に接するように配置した発熱体
６とから構成される。FIG. 1 is a perspective view of a projection type liquid crystal display device showing an embodiment of the present invention. This projection type liquid crystal display device,
A liquid crystal display element 2, a light source 1 for illuminating the liquid crystal display element 2, a projection lens 3 for enlarging and projecting a display image of the liquid crystal display element 2 on a screen, and an optical path between the light source 1 and the liquid crystal display element 2. The polarizer 4 arranged inside and the liquid crystal display element 2
An analyzer 5 arranged in the optical path between the projection lens 3 and the
The heating element 6 is arranged so as to be in contact with the peripheral portion of the liquid crystal display element 2.
【００１０】以上の構成において、光源１は２５０Ｗの
メタルハライドランプを用い、その出射光は、放物面鏡
により平行光束化され液晶表示素子２を照明する投射光
７となる。投射光７は、図には明示していないが、コー
ルドミラー、紫外線カットフィルタ等で可視光以外の光
の成分を除去している。液晶表示素子２は、画素を形成
する透明電極膜を施した二枚のガラス基板間に液晶を封
入したもので、図には明示していないが、映像信号処理
回路、並びに液晶駆動回路からの映像信号により、各画
素ごとに印加する電圧が制御される。液晶は、ツイステ
ッド・ネマティック（ＴＮ）液晶を用いており、各画素
の印加電圧による液晶の状態変化は、投射光７の偏光状
態を変化させ、さらに偏光子４、検光子５を用いること
で投射光７は、画像に応じた強度変調を受ける。液晶の
駆動方式には、各画像ごとにスイッチング素子である薄
膜トランジスタを形成し液晶を駆動するアクティブマト
リクス方式を用いている。液晶表示素子２の内部には、
画素以外の部分から投射光７が漏れることにより画像の
コントラストが低下するのを防ぐため、また投射光７に
よる薄膜トランジスタの特性変化を防ぐために、クロム
膜を格子状にパターン化した遮光用ブラックマトリクス
が形成されている。投射レンズ３は、液晶表示素子２の
表示画像をスクリーンに拡大投射するもので、投射画像
のピントを調節できるようにフォーカス調整機構が付い
ている。発熱体６は、Ｎｉ−Ｃｒ系合金（ニクロム線）
であり、液晶表示素子２の周辺部に密着するよう耐熱性
接着剤で接着している。In the above structure, the light source 1 uses a 250 W metal halide lamp, and the emitted light becomes a parallel light flux by the parabolic mirror and becomes the projection light 7 for illuminating the liquid crystal display element 2. Although not shown in the drawing, the projection light 7 has a component other than visible light removed by a cold mirror, an ultraviolet cut filter, or the like. The liquid crystal display element 2 is one in which a liquid crystal is sealed between two glass substrates provided with transparent electrode films forming pixels, and although not shown in the drawing, it is provided by a video signal processing circuit and a liquid crystal driving circuit. The voltage applied to each pixel is controlled by the video signal. Twisted nematic (TN) liquid crystal is used as the liquid crystal, and the change in the state of the liquid crystal due to the applied voltage to each pixel changes the polarization state of the projection light 7 and further uses the polarizer 4 and the analyzer 5 for projection. The light 7 undergoes intensity modulation according to the image. As a liquid crystal driving method, an active matrix method in which a thin film transistor which is a switching element is formed for each image to drive the liquid crystal is used. Inside the liquid crystal display element 2,
In order to prevent the contrast of an image from being lowered due to the leakage of the projection light 7 from portions other than the pixels, and to prevent the characteristic change of the thin film transistor due to the projection light 7, a light-shielding black matrix in which a chromium film is patterned in a grid pattern is used. Has been formed. The projection lens 3 magnifies and projects the display image of the liquid crystal display element 2 on the screen, and has a focus adjustment mechanism so that the focus of the projection image can be adjusted. The heating element 6 is a Ni-Cr alloy (nichrome wire).
Therefore, the liquid crystal display element 2 is adhered with a heat resistant adhesive so as to be in close contact with the peripheral portion.
【００１１】発熱体６を液晶表示素子２の周辺部に配置
したことの作用は、以下の通りである。投射光７で液晶
表示素子２を照明すると、投射光７の一部は液晶表示素
子２の主に遮光用ブラックマトリクスで吸収され、液晶
表示素子２の温度が上昇する。投射光７の強度分布が中
心部で強いことや、液晶表示素子２の周辺部はケースや
取付治具への熱伝導による冷却効果が作用することによ
り、液晶表示素子２は周辺部より中央部の温度が高いと
いう面内温度分布を有することになる。液晶表示素子２
にこのような面内温度分布があると、液晶表示素子２を
構成するガラス基板に、場所による熱膨張の違いから歪
が生じる。この歪は、ガラス基板に複屈折を生じさせ、
さらにガラス基板を複屈折に起因する表示むらを投射画
像に発生させる。ここで、発熱体６で液晶表示素子２の
周辺部を加熱すると、液晶表示素子２の面内温度分布を
均一にすることができる。液晶表示素子２の面内温度分
布が均一であれば、ガラス基板に歪が発生しないため、
ガラス基板の複屈折に起因する投射画像の表示むらは生
じない。したがって、高輝度光源を使用しても投射画像
は劣化せず、高画質で明るい投射画像を得ることができ
る本実施例において、発熱体６で液晶表示素子２の周辺
部を加熱しない場合、液晶表示素子２の中央部と周辺部
の温度差は約１２℃であり、投射画像のコントラストの
最大値は約２５０、最小値は約８０のコントラストむら
が生じていたが、発熱体６で液晶表示素子２の周辺部を
加熱した場合、温度差は３℃以内であり、投射画像のコ
ントラストむらは認識されなかった。また、液晶表示素
子２の温度上昇を抑えるためにファンで空冷しても、発
熱体６で加熱しない場合には、液晶表示素子２の中央部
と周辺部の温度差は約８℃あり、投射画像のコントラス
トの最大値は約２５０、最小値は約１２０のコントラス
トむらが生じていたが、発熱体６で液晶表示素子２の周
辺部を加熱すると、温度差は２℃以内になり、同様に投
射画像のコントラストむらは認識されなかった。The operation of disposing the heating element 6 in the peripheral portion of the liquid crystal display element 2 is as follows. When the liquid crystal display element 2 is illuminated with the projection light 7, a part of the projection light 7 is absorbed mainly by the light-shielding black matrix of the liquid crystal display element 2, and the temperature of the liquid crystal display element 2 rises. The intensity distribution of the projected light 7 is strong in the central portion, and the peripheral portion of the liquid crystal display element 2 is cooled by heat conduction to the case and the mounting jig. Will have an in-plane temperature distribution of high temperature. Liquid crystal display element 2
With such an in-plane temperature distribution, the glass substrate forming the liquid crystal display element 2 is distorted due to the difference in thermal expansion depending on the location. This distortion causes birefringence in the glass substrate,
Further, the glass substrate causes display unevenness due to birefringence in the projected image. Here, by heating the peripheral portion of the liquid crystal display element 2 with the heating element 6, the in-plane temperature distribution of the liquid crystal display element 2 can be made uniform. If the in-plane temperature distribution of the liquid crystal display element 2 is uniform, distortion does not occur in the glass substrate,
Display unevenness of the projected image due to the birefringence of the glass substrate does not occur. Therefore, even if a high-intensity light source is used, the projected image is not deteriorated, and a bright projected image with high image quality can be obtained. In this embodiment, when the peripheral portion of the liquid crystal display element 2 is not heated by the heating element 6, the liquid crystal The temperature difference between the central portion and the peripheral portion of the display element 2 was about 12 ° C., and the contrast of the projected image had a maximum value of about 250 and a minimum value of about 80. When the peripheral portion of the element 2 was heated, the temperature difference was within 3 ° C., and the uneven contrast of the projected image was not recognized. Further, if the liquid is not cooled by the heating element 6 even if it is air-cooled by a fan to suppress the temperature rise of the liquid crystal display element 2, the temperature difference between the central portion and the peripheral portion of the liquid crystal display element 2 is about 8 ° C. The maximum value of the contrast of the image is about 250, and the minimum value is about 120, and the unevenness of the contrast occurs. However, when the peripheral part of the liquid crystal display element 2 is heated by the heating element 6, the temperature difference becomes within 2 ° C., and similarly. The contrast unevenness of the projected image was not recognized.
【００１２】以上の説明において、光源１は、メタルハ
ライドランプの他にキセノンランプ、ハロゲンランプ等
の高輝度白色光源が使用できる。液晶は、ＴＮ液晶以外
にも強誘電性液晶、複屈折制御型液晶等、偏光状態を制
御し画像を形成するタイプの液晶を用いることができ
る。液晶の駆動方式は、時分割駆動の単純マトリクス方
式でも良い。発熱体６は、ニクロム線に限らず、白金、
タングステン等の金属発熱体や、炭化ケイ素等の非金属
発熱体が使用できる。また、金属薄膜やＩＴＯ（インジ
ウム酸化すず）膜等、導電性薄膜を液晶表示素子２の周
辺部に直接形成しても良い。発熱体６は、液晶表示素子
２の周辺部全域に均等に配置する必要はなく、離散的に
配置しても良いし、特に液晶表示素子２の四隅を多く加
熱すると、より効果的である。発熱体６の加熱方式は、
一定電流を流す方式や、温度センサと制御回路により温
度コントロールを行う方式で使用できる。液晶表示素子
２は、白黒表示の場合やカラーフィルタを内蔵したカラ
ー表示の場合のいずれにも適用できる。また、光源から
の投射光をダイクロイックミラーやダイクロイックプリ
ズムで赤、青、緑の三色に分割し、それぞれ三枚の液晶
表示素子を照明し、三本の投射レンズで投射する方式、
さらに、三枚の液晶表示素子を透過した光を再びダイク
ロイックミラーやダイクロックプリズムで合成して一本
の投射レンズで投射する方式のカラー表示の場合でも同
様の投射型液晶表示装置が得られる。In the above description, as the light source 1, a high brightness white light source such as a xenon lamp or a halogen lamp can be used in addition to the metal halide lamp. As the liquid crystal, other than TN liquid crystal, a liquid crystal of a type that forms an image by controlling the polarization state, such as a ferroelectric liquid crystal and a birefringence control type liquid crystal, can be used. The liquid crystal drive system may be a time-division drive simple matrix system. The heating element 6 is not limited to nichrome wire, but platinum,
A metal heating element such as tungsten or a non-metal heating element such as silicon carbide can be used. Alternatively, a conductive thin film such as a metal thin film or an ITO (indium tin oxide) film may be directly formed on the peripheral portion of the liquid crystal display element 2. The heating elements 6 do not have to be evenly arranged over the entire peripheral portion of the liquid crystal display element 2, but may be arranged discretely. Particularly, it is more effective if the four corners of the liquid crystal display element 2 are heated. The heating method of the heating element 6 is
It can be used with a method of passing a constant current or a method of controlling the temperature with a temperature sensor and a control circuit. The liquid crystal display element 2 can be applied to both monochrome display and color display with a built-in color filter. In addition, the projection light from the light source is divided into three colors of red, blue, and green by a dichroic mirror or a dichroic prism, three liquid crystal display elements are illuminated, and three projection lenses are used for projection.
Further, a similar projection type liquid crystal display device can be obtained even in the case of color display in which light transmitted through the three liquid crystal display elements is again combined by a dichroic mirror or a dichroic prism and projected by a single projection lens.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば、
発熱体を液晶表示素子の外周部に接するように配置し、
液晶表示素子の周辺部を加熱することにより、輝度の高
い光源を使用した場合に生じる、液晶表示素子の中央部
の温度が高く周辺部の温度が低くなるという面内温度分
布を均一にし、ガラス基板の歪を低減することができ
た。したがって、ガラス基板の複屈折に起因する表示む
らが投射画像に生じない。すなわち高画質で明るい投射
画像を表示することができる投射型液晶表示装置を得る
ことができた。As described above, according to the present invention,
Arrange the heating element in contact with the outer periphery of the liquid crystal display element,
By heating the peripheral portion of the liquid crystal display element, a uniform temperature distribution in the plane, which occurs when a light source with high brightness is used, that is, the temperature of the central portion of the liquid crystal display element is high and the temperature of the peripheral portion is low, is obtained. The distortion of the substrate could be reduced. Therefore, display unevenness due to the birefringence of the glass substrate does not occur in the projected image. That is, it was possible to obtain a projection type liquid crystal display device capable of displaying a high quality and bright projection image.
【図１】本発明の実施例を示す投射型液晶表示装置の斜
視図。FIG. 1 is a perspective view of a projection type liquid crystal display device showing an embodiment of the present invention.
【図２】従来例を説明するための投射型液晶表示装置の
斜視図。FIG. 2 is a perspective view of a projection type liquid crystal display device for explaining a conventional example.
【符号の説明】 １ 光源 ２ 液晶表示素子 ３ 投射レンズ ４ 偏光子 ５ 検光子 ６ 発熱体 ７ 投射光[Explanation of reference numerals] 1 light source 2 liquid crystal display element 3 projection lens 4 polarizer 5 analyzer 6 heating element 7 projection light
Claims (1)
示素子の表示画像をスクリーン面に投影するための光源
および投射レンズとから構成される投射型液晶表示装置
において、前記液晶表示素子の周辺部を加熱する発熱体
を、前記液晶表示素子の周辺部に接するように配置した
ことを特徴とする投射型液晶表示装置。Claim: What is claimed is: 1. A projection type liquid crystal display device comprising at least a liquid crystal display element, a light source for projecting a display image of the liquid crystal display element on a screen surface, and a projection lens. A projection type liquid crystal display device, wherein a heating element for heating the peripheral portion of the liquid crystal display element is arranged so as to be in contact with the peripheral portion of the liquid crystal display element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3168547A JP3063244B2 (en) | 1991-07-10 | 1991-07-10 | Projection type liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3168547A JP3063244B2 (en) | 1991-07-10 | 1991-07-10 | Projection type liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0519256A true JPH0519256A (en) | 1993-01-29 |
| JP3063244B2 JP3063244B2 (en) | 2000-07-12 |
Family
ID=15870044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3168547A Expired - Lifetime JP3063244B2 (en) | 1991-07-10 | 1991-07-10 | Projection type liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3063244B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0772068A1 (en) * | 1995-10-31 | 1997-05-07 | Smiths Industries Public Limited Company | Display assemblies |
| CN115113460A (en) * | 2021-03-18 | 2022-09-27 | 精工爱普生株式会社 | Image forming panel device and projector |
-
1991
- 1991-07-10 JP JP3168547A patent/JP3063244B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0772068A1 (en) * | 1995-10-31 | 1997-05-07 | Smiths Industries Public Limited Company | Display assemblies |
| US5818010A (en) * | 1995-10-31 | 1998-10-06 | Smiths Industries Plc | Display assemblies |
| CN115113460A (en) * | 2021-03-18 | 2022-09-27 | 精工爱普生株式会社 | Image forming panel device and projector |
| CN115113460B (en) * | 2021-03-18 | 2023-10-20 | 精工爱普生株式会社 | Image forming panel device and projector |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3063244B2 (en) | 2000-07-12 |
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