JP2892733B2 - Projection display device - Google Patents
Projection display deviceInfo
- Publication number
- JP2892733B2 JP2892733B2 JP2004166A JP416690A JP2892733B2 JP 2892733 B2 JP2892733 B2 JP 2892733B2 JP 2004166 A JP2004166 A JP 2004166A JP 416690 A JP416690 A JP 416690A JP 2892733 B2 JP2892733 B2 JP 2892733B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- display device
- screen
- projection
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、受光型ライトバルブに照射し通過した光を
スクリーン上に投影する投射型表示装置に関するもので
ある。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device which irradiates a light receiving type light valve and projects the light passing therethrough onto a screen.
従来の技術 近年、液晶素子を受光型ライトバルブとして用いた投
射型液晶表示装置が多く発表されている。この方式の表
示装置はブラウン管を用いる方式に比べ小型、軽量化が
可能であり、光精細大画面ディスプレイが比較的容易に
実現できる。第６図は投射型表示装置の概念図である。
受光型ライトバルブ63に照射された光は投射レンズ64を
経てスクリーン65上に投影され、このときの受光型ライ
トバルブ上の明暗のパターンをスクリーン上に投影す
る。2. Description of the Related Art In recent years, many projection type liquid crystal display devices using a liquid crystal element as a light receiving type light valve have been announced. The display device of this system can be made smaller and lighter than a system using a cathode ray tube, and a light-definition large-screen display can be realized relatively easily. FIG. 6 is a conceptual diagram of a projection type display device.
The light applied to the light receiving type light valve 63 is projected on a screen 65 via a projection lens 64, and the light / dark pattern on the light receiving type light valve at this time is projected on the screen.
発明が解決しようとする課題 しかしながら上記のような構成では、投射画面上の明
るさは、口径蝕の課題やcos4θ則と一般に呼ばれるよう
な光学系の影響により、画面中央部から画面周辺部方向
へ輝度が低下する同心円状の輝度むらが生じるといった
課題がある。INVENTION In trying to problems, however, such as the configuration resolution, brightness on the projection screen, due to the influence of the optical system as referred to challenges and cos 4 theta law and general vignetting, the peripheral area from the center of the screen There is a problem that concentric luminance unevenness in which the luminance decreases in the direction occurs.
本発明は上記課題に鑑み、均質な明るさを有する投射
型表示装置とそれに用いる受光型ライトバルブを提供す
るものである。The present invention has been made in view of the above problems, and provides a projection display apparatus having uniform brightness and a light receiving light valve used for the same.
課題を解決するための手段 上記課題を解決するために本発明の投射型表示装置
は、光源からの光を複数の波長に分割し、分割した各波
長の光を分割数に応じたそれぞれの受光型ライトバルブ
に照射し、通過した光を合成した後スクリーン上に投影
する表示装置であって、前記受光型ライトバルブは複数
の画素を持ち、前記各波長を単独で前記スクリーンに投
射したときに前記スクリーン上で最も明るい点を原点と
し、Ｘ軸を水平方向、Ｙ軸を垂直方向とし、前記画素に
対応するスクリーン上の座標をそれぞれＸとＹとし、前
記画素の水平方向の長さをHw（Ｘ）、垂直方向の長さを
Hh（Ｙ）としたとき、個々の前記Hw（Ｘ）、Hh（Ｙ）が
概ね、Hw（Ｘ）＝ｋ（１＋X2/2）、Hh（Ｙ）＝ｋ（１＋
Y2/2）（但し、ｋは係数）で表わされる受光型ライトバ
ルブを用いたことにより、投射画面上の輝度むらを低減
させ均一な画面表示を実現できる。Means for Solving the Problems In order to solve the above problems, a projection display device of the present invention divides light from a light source into a plurality of wavelengths, and receives light of each of the divided wavelengths according to the number of divisions. A display device that irradiates a type light valve and projects the combined light on a screen after projecting the light, wherein the light receiving type light valve has a plurality of pixels and projects each of the wavelengths on the screen alone. The brightest point on the screen is the origin, the X axis is the horizontal direction, the Y axis is the vertical direction, the coordinates on the screen corresponding to the pixel are X and Y, respectively, and the horizontal length of the pixel is Hw (X), the vertical length
When the Hh (Y), each of said Hw (X), Hh (Y ) is generally, Hw (X) = k ( 1 + X 2/2), Hh (Y) = k (1+
Y 2/2) (where, k is by using a light receiving type light valve represented by coefficients), can realize uniform screen display to reduce the luminance unevenness on the projection screen.
作用 受光型ライトバルブを用いた投射型表示装置の画面上
の点の明るさは、用いる光学系（光源からの放射光を複
数の相異なる波長にそれぞれ分割する波長分割手段と、
相異なる波長を合成する波長合成手段を含む）によって
決定され、ほぼ同心円状に輝度むらが生じる。ここで座
標原点を投射画面の最も明るい点にとり、受光型ライト
バルブの無い場合の投射画面上の明るさＢ（x,y）を測
定すると、その関数形は、 の形で近似的に表すことができる。ここでＫ、Ｄは定数
である。複雑な光学系を有する場合であっても基本的に
はこの関数形で十分な近似が得られる。The brightness of a point on the screen of a projection display device using a light receiving type light valve is determined by an optical system (wavelength dividing means for dividing light emitted from a light source into a plurality of different wavelengths,
(Including wavelength synthesizing means for synthesizing different wavelengths), and luminance unevenness occurs substantially concentrically. Here, taking the coordinate origin as the brightest point on the projection screen and measuring the brightness B (x, y) on the projection screen without the light receiving type light valve, the function form is Can be approximately expressed in the form Here, K and D are constants. Even if the optical system has a complicated optical system, a sufficient approximation can be basically obtained with this function form.
ここで投射画面上の輝度を均一にするために、光源か
ら放射した光を波長分割した各波長が透過する液晶シャ
ッタの各画素の開口率Ｗ（x,y）を変化させるとすると Ｂ（x,y）×Ｗ（x,y）＝一定 の関係が必要であり、これより となる、ここで、Ｋ′、Ｄは光学系によって決定される
定数である。Here, if the aperture ratio W (x, y) of each pixel of the liquid crystal shutter through which each wavelength obtained by dividing the light emitted from the light source is transmitted is changed in order to make the luminance on the projection screen uniform, B (x , y) × W (x, y) = constant relationship is required. Where K ′ and D are constants determined by the optical system.
またx/D、y/Dが十分小さな場合には、この式は近似的
に と表わすことができる。If x / D and y / D are small enough, this equation Can be expressed as
ここで特に上記基板に互いに直交するストライプ状に
電極を有する単純マトリックス液晶素子の場合で、電界
の印加されない部分が暗状態であるノーマリーホワイト
（normally white）の条件では電極以外の部分は遮光層
として働くため、その表示に寄与する電極の幅Ｈ
（ｘ）、Ｈ（ｙ）をそれぞれ と定めることにより、互いの電極が直交する点の開口率
Ｗ（x,y）＝Ｈ（ｘ）×Ｈ（ｙ）を制御し、投射画面上
に輝度むらの生じない均一な表示が可能となる。Here, particularly in the case of a simple matrix liquid crystal device having electrodes in the form of stripes orthogonal to each other on the substrate, portions other than the electrodes are light-shielding layers under normally white conditions, where portions where no electric field is applied are dark. The width H of the electrode contributing to the display
(X) and H (y) respectively By controlling the aperture ratio W (x, y) = H (x) × H (y) at a point where the electrodes are orthogonal to each other, uniform display without luminance unevenness on the projection screen can be realized. Become.
実施例 以下本発明の一実施例の受光型ライトバルブを用いた
投射型表示装置について図面を参照しながら説明する。
本実施例においては受光型ライトバルブに上下基板間に
強誘電性液晶を挟持した単純マトリックス液晶パネルを
用いた。第３図は本発明の実施例における液晶表示装置
の構成を示すものである。第３図（ａ）は前記液晶表示
装置の投射光学系の構成図、第３図（ｂ）は前記液晶表
示装置のキャビネット内の光学系構成図である。ランプ
302からの射出光は集光レンズ303で集光されてｘ字状に
交差したダイクロイックミラー（dichroic mirror304,3
05）によって３原色に分光され、それぞれ赤、緑、青に
対応する液晶光スイッチ306に照射される。液晶光スイ
ッチを通過した光はプリズム型ダイクロイックミラー30
7により合成された投射レンズ308、第１ミラー310、第
２ミラー311、第３ミラー312を経て、スクリーン313上
に投射される。この光学系におけるスクリーン313上の
輝度分布の実測値は液晶パネル306を挿入しない場合第
５図のようになる。画素の面積が均一な液晶パネルを挿
入した場合にも第５図と同様の結果が得られた。第５図
の値は画面を25分割し、その平均的な輝度を規格化して
表わしたものである。また細かな測定値と前記近似式よ
り電極の幅Ｈ（ｘ）、Ｈ（ｙ）は求められた。ここで座
標原点は画面中央であり、ｘ、ｙの範囲は−１から１ま
でである。Embodiment A projection display device using a light-receiving light valve according to an embodiment of the present invention will be described below with reference to the drawings.
In this embodiment, a simple matrix liquid crystal panel in which a ferroelectric liquid crystal is interposed between upper and lower substrates is used for a light receiving type light valve. FIG. 3 shows a configuration of a liquid crystal display device according to an embodiment of the present invention. FIG. 3A is a configuration diagram of a projection optical system of the liquid crystal display device, and FIG. 3B is a configuration diagram of an optical system in a cabinet of the liquid crystal display device. lamp
The light emitted from 302 is condensed by a condenser lens 303 and crosses in an x-shape.
05), the light is split into three primary colors, and the liquid crystal light switches 306 corresponding to red, green, and blue are irradiated. The light that has passed through the liquid crystal optical switch is a prism type dichroic mirror 30
The light is projected onto the screen 313 via the projection lens 308, the first mirror 310, the second mirror 311, and the third mirror 312 synthesized by the step 7. The measured values of the luminance distribution on the screen 313 in this optical system are as shown in FIG. 5 when the liquid crystal panel 306 is not inserted. When a liquid crystal panel having a uniform pixel area was inserted, the same results as in FIG. 5 were obtained. The values shown in FIG. 5 are obtained by dividing the screen into 25 and normalizing the average luminance. Further, the electrode widths H (x) and H (y) were obtained from the fine measurement values and the above-described approximate expression. Here, the coordinate origin is at the center of the screen, and the range of x and y is from -1 to 1.
第１図及び第２図は上式に従って作成した本発明の実
施例における液晶表示素子の構成を示すものである。第
１図（ａ）、第２図は本発明の液晶パネルの構成を概念
的に示したものであり、第１図（ａ）は平面図、第１図
（ｂ）（ｃ）はそれぞれ第１図（ａ）の11、12に対応す
る周辺部拡大平面図、第１図（ｂ）は第１図（ａ）の11
に対応する中央部拡大平面図、第２図（ａ）は断面図、
第２図（ｂ）は第２図（ａ）の６に対応する拡大断面図
である。上下基板11、12にそれぞれストライプ状の透明
電極13、14を形成し、電極上に配向膜23を形成し、２μ
ｍのスペーサー21を挟んだ後、電極13、14が直交するよ
うに上下基板11、12を組み合わせ、この基板間に強誘電
性液晶22を封入し配向させた。液晶材料はエステル系の
強誘電性液晶を用い、配向膜23はSiOを基板法線から82
度傾いた方向から蒸着し形成した。電極13、14のピッチ
は30μｍで一定とし、電極13、14の形状は短形で、その
短辺の長さは前記関係式で決定され中央部で約17μｍ、
周辺部では約25μｍとなる、周辺部ほど電極幅の広い電
極構成とした。第１図（ｂ）と第１図（ｄ）の比較によ
り、画素すなわち上下透明電極交差する領域の面積は、
画面中央部19と周辺部18では明瞭に異なる。この液晶パ
ネルを２枚の直交する偏光版25、24の間に設置し、電極
に所定のパルスを印加することで、液晶パネルに表示パ
ターンを形成する。また画素以外の領域は、周期的に各
フィールドごとに±25ボルト、１ミリ秒の比較的大きな
リセットパルスを隣あう２つの電極に印加することで、
その電極間の間隙部の液晶も駆動させ、電極間隙部をす
べて暗状態とすることで、遮光層となるブラックマトリ
ックスを形成した（例えば特願平１−2422号参照）。 1 and 2 show the structure of a liquid crystal display device according to an embodiment of the present invention prepared according to the above equation. FIGS. 1A and 2 conceptually show the structure of a liquid crystal panel of the present invention. FIG. 1A is a plan view, and FIGS. 1 (a) is an enlarged plan view of a peripheral portion corresponding to 11 and 12; FIG. 1 (b) is an enlarged plan view of 11 in FIG. 1 (a);
2 (a) is a sectional view, and FIG.
FIG. 2 (b) is an enlarged sectional view corresponding to 6 in FIG. 2 (a). Stripe transparent electrodes 13 and 14 are formed on the upper and lower substrates 11 and 12, respectively, and an alignment film 23 is formed on the electrodes.
After the spacer 21 of m, the upper and lower substrates 11 and 12 were combined so that the electrodes 13 and 14 were orthogonal to each other, and a ferroelectric liquid crystal 22 was sealed and aligned between the substrates. The liquid crystal material is an ester-based ferroelectric liquid crystal, and the alignment film 23 is made of SiO,
It was formed by evaporation from a direction inclined at an angle. The pitch of the electrodes 13 and 14 is constant at 30 μm, the shape of the electrodes 13 and 14 is short, and the length of the short side is determined by the above relational expression and is about 17 μm at the center,
The electrode configuration was about 25 μm in the peripheral portion, and the electrode width was wider in the peripheral portion. By comparing FIG. 1 (b) and FIG. 1 (d), the area of the pixel, that is, the area where the upper and lower transparent electrodes intersect, is
The central part 19 of the screen and the peripheral part 18 are clearly different. This liquid crystal panel is placed between two orthogonal polarizing plates 25 and 24, and a predetermined pulse is applied to the electrodes to form a display pattern on the liquid crystal panel. In the area other than the pixels, a relatively large reset pulse of ± 25 volts and 1 millisecond is applied periodically to each of two adjacent electrodes for each field.
The liquid crystal in the gap between the electrodes was also driven to make all the gaps between the electrodes dark, thereby forming a black matrix serving as a light-shielding layer (for example, see Japanese Patent Application No. 1-2422).
本発明の液晶素子を用いることで、輝度分布は第４図
に示す値となり、従来の画素の大きさがすべて同じであ
る液晶素子を用いた場合の第５図と比較し、輝度むらが
極めて低減された。By using the liquid crystal element of the present invention, the luminance distribution becomes the value shown in FIG. 4, and the luminance unevenness is extremely small as compared with FIG. 5 in which a conventional liquid crystal element having the same pixel size is used. Reduced.
次に第２の実施例について述べる。第１の実施例と同
じ光学系（第３図）を用い、液晶パネルに電極13、14の
幅が一定とし、幅を変えたブラックマトリックスとなる
よう遮光層25を形成したものを用いた。ブラックマトリ
ックス間の距離は第１の実施例と同様に となるようにすると第１の実施例と同様の結果が得ら
れ、この場合も輝度むらの大幅低減が実現できた。Next, a second embodiment will be described. The same optical system as in the first embodiment (FIG. 3) was used, and a liquid crystal panel in which the width of the electrodes 13 and 14 was fixed and the light shielding layer 25 was formed so as to form a black matrix with the changed width was used. The distance between the black matrices is the same as in the first embodiment. In this case, the same result as that of the first embodiment was obtained, and in this case, the luminance unevenness was significantly reduced.
発明の効果 本発明の受光型ライトバルブを用いた投射型表示装置
は、前記受光型ライトバルブの各画素の開口率を、光学
系によって定められる投射画面上の各波長単独の明るさ
に従って制御することにより、投射画面上の輝度むらを
押え、均一な輝度分布を得ることができる。The projection type display device using the light receiving type light valve of the present invention controls the aperture ratio of each pixel of the light receiving type light valve according to the brightness of each wavelength on the projection screen determined by the optical system. Thus, uneven brightness on the projection screen can be suppressed, and a uniform brightness distribution can be obtained.
第１図（ａ）は本発明の一実施例の液晶素子の平面図、
第１図（ｂ）（ｃ）（ｄ）は第１図（ａ）の拡大図、第
２図（ａ）（ｂ）は本発明の一実施例の液晶素子の断面
図と拡大断面図、第３図（ａ）は本発明の一実施例の投
射型液晶表示装置の投射光学系の構成図、第３図（ｂ）
は本発明の一実施例の投射型液晶表示装置のキャビネッ
ト内の構成図、第４図は本発明の投射型液晶表示装置の
投射画面上の輝度分布図、第５図は従来方式の投射型表
示装置の投射画面上の輝度分布図、第６図は投射型表示
装置の概念図である。 11……上基板、12……下基板、13……列電極群、14……
行電極群、15……電極ピッチ、16……周辺部電極幅、17
……中央部電極幅、18……周辺部表示画素、19……中央
部表示画素、21……スペーサー、22……強誘電性液晶
層、23……配向膜、302……ランプ、303……集光レン
ズ、304,305,307……ダイクロイックミラー、306……液
晶パネル、308……投射レンズ、310,311,313……ミラ
ー、313……スクリーン、61……ランプ、62……集光レ
ンズ、63……受光型ライトバルブ、64……投射レンズ、
65……スクリーン。FIG. 1A is a plan view of a liquid crystal element according to an embodiment of the present invention,
1 (b), (c) and (d) are enlarged views of FIG. 1 (a), and FIGS. 2 (a) and (b) are cross-sectional views and enlarged cross-sectional views of a liquid crystal element according to an embodiment of the present invention. FIG. 3 (a) is a configuration diagram of a projection optical system of a projection type liquid crystal display device according to one embodiment of the present invention, and FIG. 3 (b).
FIG. 4 is a configuration diagram of a projection type liquid crystal display device according to an embodiment of the present invention in a cabinet, FIG. 4 is a luminance distribution diagram on a projection screen of the projection type liquid crystal display device of the present invention, and FIG. FIG. 6 is a conceptual diagram of a projection type display device, showing a luminance distribution diagram on a projection screen of the display device. 11 ... upper substrate, 12 ... lower substrate, 13 ... column electrode group, 14 ...
Row electrode group, 15: electrode pitch, 16: peripheral electrode width, 17
... Central electrode width, 18 ... Peripheral display pixel, 19 ... Central display pixel, 21 ... Spacer, 22 ... Ferroelectric liquid crystal layer, 23 ... Orientation film, 302 ... Lamp, 303 ... ... Condenser lens, 304,305,307 ... Dichroic mirror, 306 ... Liquid crystal panel, 308 ... Projection lens, 310,311,313 ... Mirror, 313 ... Screen, 61 ... Lamp, 62 ... Condenser lens, 63 ... Receiver type Light valve, 64 ... Projection lens,
65 ... Screen.
フロントページの続き (56)参考文献 特開 昭63−293523（ＪＰ，Ａ) 特開 昭63−243988（ＪＰ，Ａ) 特開 昭63−244021（ＪＰ，Ａ) 特開 昭54−148496（ＪＰ，Ａ) 特開 昭60−179723（ＪＰ，Ａ) 特開 昭64−35479（ＪＰ，Ａ) 実開 平１−94985（ＪＰ，Ｕ)Continuation of the front page (56) References JP-A-63-293523 (JP, A) JP-A-63-243988 (JP, A) JP-A-63-244021 (JP, A) JP-A-54-148496 (JP) JP-A-60-179723 (JP, A) JP-A-64-35479 (JP, A) JP-A-1-94985 (JP, U)
Claims (5)
した各波長の光を分割数に応じたそれぞれの受光型ライ
トバルブに照射し、通過した光を合成した後スクリーン
上に投影する表示装置であって、前記受光型ライトバル
ブは複数の画素を持ち、前記各波長を単独で前記スクリ
ーンに投射したときに前記スクリーン上で最も明るい点
を原点とし、Ｘ軸を水平方向、Ｙ軸を垂直方向とし、前
記画素に対応するスクリーン上の座標をそれぞれＸとＹ
とし、前記画素の水平方向の長さをHw（Ｘ）、垂直方向
の長さをHh（Ｙ）としたとき、個々の前記Hw（Ｘ）、Hh
（Ｙ）が概ね、 Hw（Ｘ）＝ｋ（１＋X2/2） Hh（Ｙ）＝ｋ（１＋Y2/2） （但し、ｋは係数） で表わされる受光型ライトバルブを用いたことを特徴と
した投射型表示装置。A light from a light source is divided into a plurality of wavelengths, and the light of each of the divided wavelengths is applied to a corresponding one of light receiving type light valves according to the number of divisions, and the transmitted light is synthesized and then projected on a screen. Wherein the light receiving type light valve has a plurality of pixels, and when each of the wavelengths is independently projected on the screen, the brightest point on the screen is defined as the origin, the X axis is in the horizontal direction, and the Y axis is in the horizontal direction. The axis is vertical, and the coordinates on the screen corresponding to the pixel are X and Y, respectively.
When the horizontal length of the pixel is Hw (X) and the vertical length is Hh (Y), the individual Hw (X), Hh
(Y) is generally, Hw (X) = k ( 1 + X 2/2) Hh (Y) = k (1 + Y 2/2) ( where, k is a coefficient) characterized by using the light-receiving-type light valve is expressed by Projection display device.
状電極を用いた単純マトリクス液晶表示素子を含む請求
項（１）記載の投射型表示装置。2. The projection type display device according to claim 1, wherein the light receiving type light valve includes a simple matrix liquid crystal display device using rectangular stripe electrodes.
ｋ（１＋Y2/2）の関係をそれぞれ満たすように、ライト
バルブ中に遮光層を設けた請求項（１）または（２）い
ずれかに記載の投射型表示装置。Wherein Hw (X) = k (1 + X 2/2) and Hh (Y) =
k so as to satisfy (1 + Y 2/2) of the relationship, respectively, claim in which a light-shielding layer in the light valve (1) or (2) a projection type display device according to any one.
極間の間隙部を、前記２つの電極に、前記間隙部に存在
する液晶表示素子の液晶材料の状態を、暗状態に切り替
える所定のパルス電圧を電源投入時に印加する請求項
（２）記載の投射型表示装置。4. A predetermined portion for switching a state of a liquid crystal material of a liquid crystal display element existing in the gap between two adjacent electrodes among the stripe-shaped electrodes to the two electrodes, to a dark state. 3. The projection display device according to claim 2, wherein a pulse voltage is applied when the power is turned on.
晶を用いる請求項（２）または（４）いずれかに記載の
投射型表示装置。5. The projection display according to claim 2, wherein a ferroelectric liquid crystal is used as a liquid crystal material of the liquid crystal display element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004166A JP2892733B2 (en) | 1990-01-11 | 1990-01-11 | Projection display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004166A JP2892733B2 (en) | 1990-01-11 | 1990-01-11 | Projection display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03209213A JPH03209213A (en) | 1991-09-12 |
| JP2892733B2 true JP2892733B2 (en) | 1999-05-17 |
Family
ID=11577158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004166A Expired - Fee Related JP2892733B2 (en) | 1990-01-11 | 1990-01-11 | Projection display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2892733B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0786814A1 (en) * | 1996-01-26 | 1997-07-30 | Hewlett-Packard Company | Photosensor array with compensation for optical aberrations and illumination non-uniformity |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54148496A (en) * | 1978-05-15 | 1979-11-20 | Seiko Epson Corp | Color liquid crystal display unit |
| JP2733222B2 (en) * | 1987-03-31 | 1998-03-30 | キヤノン株式会社 | Liquid crystal device |
| JPH0833546B2 (en) * | 1987-03-31 | 1996-03-29 | 松下電器産業株式会社 | Display device and projection television using the same |
| JPS63293523A (en) * | 1987-05-26 | 1988-11-30 | Seiko Epson Corp | Liquid crystal optical shutter device |
-
1990
- 1990-01-11 JP JP2004166A patent/JP2892733B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03209213A (en) | 1991-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3896338A (en) | Color video display system comprising electrostatically deflectable light valves | |
| TW482919B (en) | Projection type color image display apparatus | |
| KR100189278B1 (en) | Projection-type color display device | |
| KR100930237B1 (en) | Illumination optical system employing a dichroic mirror wheel and an image display device having the same | |
| JPH0212124A (en) | Display device | |
| US5184238A (en) | Apparatus for projecting light onto a surface having reflector means for improving the brightness of the image | |
| JPH0435048B2 (en) | ||
| US6802612B2 (en) | Configurations for color displays by the use of lenticular optics | |
| JPS5897983A (en) | Projection type display | |
| US7433003B2 (en) | Liquid crystal on silicon panel and method of manufacturing the same | |
| KR960016286B1 (en) | Image display apparatus of projection type | |
| JP2000075259A (en) | Liquid crystal device and projection type display device using the same | |
| JP2548182B2 (en) | Liquid crystal display panel and projection television using the same | |
| JP2892733B2 (en) | Projection display device | |
| JPS6222136B2 (en) | ||
| JPH05346566A (en) | Projection type color image display device | |
| JPH06208112A (en) | Direct-view display device | |
| KR970006985B1 (en) | Projector type image displaying apparatus | |
| JPH0679201B2 (en) | Projection type liquid crystal display | |
| JPH07104283A (en) | Color liquid crystal display device | |
| JPH083583B2 (en) | Projection color display device | |
| JPH0115848B2 (en) | ||
| JPH0990313A (en) | Liquid crystal projection device | |
| JP3767709B2 (en) | Color adjustment method for color image display device | |
| JP3114128B2 (en) | Projection type color liquid crystal display |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |