JPH05289044A - Liquid crystal interplace display device - Google Patents
Liquid crystal interplace display deviceInfo
- Publication number
- JPH05289044A JPH05289044A JP4088515A JP8851592A JPH05289044A JP H05289044 A JPH05289044 A JP H05289044A JP 4088515 A JP4088515 A JP 4088515A JP 8851592 A JP8851592 A JP 8851592A JP H05289044 A JPH05289044 A JP H05289044A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal panel
- video signal
- display
- horizontal
- 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
Landscapes
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
- Liquid Crystal Display Device Control (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は液晶パネルを用いた映像
信号のインタ−レス表示に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlace display of video signals using a liquid crystal panel.
【０００２】[0002]
【従来の技術】近年、小型テレビ、ラップトップ型ＯＡ
機器など液晶パネルを表示デバイスとした機器の商品化
が著しい。このような動きのなかで注目されるものの一
つに液晶ビデオプロジェクタがある。液晶ビデオプロジ
ェクタは従来のＣＲＴ型プロジェクタに対して小型、軽
量化が可能であり、表示性能の点でも幾何学歪みが少な
く、地磁気による影響が原理的にない、コンバ−ゼンス
精度が表示全面で均一に確保できる等の長所を持つ。一
方、液晶ビデオプロジェクタは映像をスクリ−ンに拡大
投写するので画素の粗さが目立つため直視型の液晶表示
装置に比較して高画素数の液晶パネルが必要であり、同
時に投写光学系の小型化の点から小型の液晶パネルが必
要である。以下に従来の液晶ビデオプロジェクタの基本
構成と液晶パネルの駆動について説明する。2. Description of the Related Art Recently, small televisions and laptop OAs
Commercialization of equipment such as equipment that uses liquid crystal panels as display devices is remarkable. A liquid crystal video projector is one of the things that has attracted attention in this movement. Liquid crystal video projectors can be made smaller and lighter than conventional CRT projectors, have little geometric distortion in terms of display performance, are basically unaffected by geomagnetism, and have uniform convergence accuracy over the entire display. It has the advantage that it can be secured. On the other hand, since the liquid crystal video projector projects an image in a screen in an enlarged manner, the roughness of the pixels is conspicuous, so that a liquid crystal panel with a higher number of pixels is required than a direct-view type liquid crystal display device, and at the same time, the projection optical system is small. A small liquid crystal panel is required from the standpoint of improvement. The basic configuration of the conventional liquid crystal video projector and the driving of the liquid crystal panel will be described below.
【０００３】図７は液晶ビデオプロジェックタの基本構
成の従来の一例を示すものである。図７において、１は
光源である。２は映像表示液晶パネル、３は偏光子、４
は検光子、５は投写レンズである。FIG. 7 shows a conventional example of the basic configuration of a liquid crystal video projector. In FIG. 7, 1 is a light source. 2 is an image display liquid crystal panel, 3 is a polarizer, 4
Is an analyzer and 5 is a projection lens.
【０００４】以上のように構成された液晶ビデオプロジ
ェックタについて、以下その動作について説明する。図
７の構成により光源１の白色自然光は偏光子３を通過す
ることにより直線偏光となる。ここで自然光は直交する
二つのベクトル成分（Ｐ成分とＳ成分と呼ぶ）の合成光
として考えられるため偏光子３の偏光方向をＰ成分と一
致させＰ成分のみが通過するものとする。映像表示液晶
パネル２は映像信号に従い入射したＰ成分の偏光を画素
ごとに旋光し偏光方向を制御する。検光子４は映像表示
液晶パネルを通過した偏光の偏光方向と検光子４の偏光
方向が一致した時に透過率が最大となり、直交した時に
最小となるため映像信号に応じた偏光方向制御により階
調表示ができる。以上の映像を投写レンズ５によりスク
リ−ン上に拡大投写する。投写映像の一例を図８に示
す。映像表示液晶パネル２の水平表示ライン数は２４０
本、すなわち１フレ−ムの水平走査線数の約半分しかな
い場合を示し、奇数フィ−ルドと偶数フィ−ルドの映像
は同一水平表示ラインに重ね書きされる。カラ−表示は
画素単位にカラ−フィルタを形成した映像表示液晶パネ
ルを用いる場合と、光源の白色光をダイクロイック光学
フィルタを用いて波長選択した赤、緑、青の三原色光を
それぞれの光学径路に配置した偏光子と映像表示液晶パ
ネルと検光子に通した後、再びダイクロイック光学フィ
ルタを用いて合成しフルカラ−映像にするなどの方法が
あるが本発明の原理とは直接関係しないため詳細は省略
する。The operation of the liquid crystal video projector constructed as above will be described below. With the configuration of FIG. 7, the white natural light of the light source 1 becomes linearly polarized light by passing through the polarizer 3. Here, natural light is considered as a combined light of two orthogonal vector components (referred to as P component and S component), so that the polarization direction of the polarizer 3 is made to coincide with the P component and only the P component passes. The video display liquid crystal panel 2 controls the polarization direction by rotating the polarized light of the P component that has entered according to a video signal for each pixel. The transmittance of the analyzer 4 becomes maximum when the polarization direction of the polarized light passing through the image display liquid crystal panel and the polarization direction of the analyzer 4 coincide with each other, and becomes minimum when orthogonal to each other, so that the gradation is controlled by controlling the polarization direction according to the image signal. Can be displayed. The above image is enlarged and projected on the screen by the projection lens 5. An example of the projected image is shown in FIG. The number of horizontal display lines of the image display liquid crystal panel 2 is 240.
In the case of a book, i.e., about half the number of horizontal scanning lines of one frame, the images of the odd field and the even field are overwritten on the same horizontal display line. Color display uses an image display liquid crystal panel with a color filter formed on a pixel-by-pixel basis, and white light from a light source is wavelength-selected using a dichroic optical filter. After passing through the polarizer, the image display liquid crystal panel, and the analyzer that have been arranged, there is a method such as combining again using a dichroic optical filter to make a full-color image, but details are omitted because it is not directly related to the principle of the present invention. To do.
【０００５】図９は液晶パネルの従来の駆動回路，図１
０はタイミング図を示す。図９において６はコンポジッ
ト映像信号から同期信号を分離する同期分離回路、７は
水平同期信号Ｈ、垂直同期信号Ｖに従って液晶パネルに
入力する各種タイミングパルス、クロックを発生する同
期制御回路、８はソ−スドライバ、９はゲ−トドライバ
を示す。図１０のタイミング図において、ａは水平周期
で見た映像信号、ｂは水平スタ−トパルスＳＨ、ｃはサ
ンプリングクロックＣＫを示す。ｄは垂直周期で見た映
像信号、ｅは垂直スタ−トパルスＳＶ、ｆはゲ−トクロ
ックＧＫを示す。水平周期で見た場合、ソ−スドライバ
８は水平スタ−トパルスＳＨでサンプリングを開始しサ
ンプリングクロックＣＫの立ち上がり毎に映像信号をサ
ンプリングする。垂直周期で見た場合、ゲ−トドライバ
９は、ゲ−トスタ−トパルスＳＶで垂直方向の走査を開
始し、ゲ−トクロックＧＫの立ち上がり毎に１番目から
最終番目まで水平表示ラインを順次表示する。FIG. 9 is a conventional drive circuit for a liquid crystal panel, FIG.
0 indicates a timing diagram. In FIG. 9, 6 is a sync separation circuit for separating a sync signal from a composite video signal, 7 is various timing pulses input to a liquid crystal panel according to a horizontal sync signal H and a vertical sync signal V, a sync control circuit for generating a clock, and 8 is a so-called -Gear driver, 9 is a gate driver. In the timing chart of FIG. 10, a is a video signal seen in a horizontal cycle, b is a horizontal start pulse SH, and c is a sampling clock CK. d is a video signal viewed in a vertical cycle, e is a vertical start pulse SV, and f is a gate clock GK. When viewed in the horizontal cycle, the source driver 8 starts sampling with the horizontal start pulse SH and samples the video signal at every rising edge of the sampling clock CK. When viewed in the vertical cycle, the gate driver 9 starts scanning in the vertical direction with the gate start pulse SV, and sequentially displays the horizontal display lines from the first to the last at every rising of the gate clock GK. To do.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら上記の構
成では、以下に示す問題がある。すでに述べたように液
晶ビデオプロジェクタに使用する液晶パネルは高画素数
化と小型化が要求されるため画素密度が高く、その結果
生産歩留まりが低下しコストが高くなるという問題点を
有していた。However, the above configuration has the following problems. As described above, the liquid crystal panel used in the liquid crystal video projector has a high pixel density because it is required to have a large number of pixels and a small size. As a result, the production yield is lowered and the cost is increased. ..
【０００７】本発明は上記従来の問題点を解決するもの
で、２フィ−ルドに分けてインタ−レス走査した映像信
号を表示する際に１フィ−ルド分の水平表示ライン数を
有する映像表示液晶パネルと旋光制御液晶パネルと複屈
折光学板を用い、映像の垂直方向の表示位置をフィ−ル
ドごとに水平表示ライン間隔の２分の１だけ移動しイン
タ−レス表示することにより画素数の少ない安価な液晶
パネルで高解像度表示と液晶パネルの小型化を可能とす
ることを目的とする。The present invention solves the above-mentioned conventional problems, and when displaying a video signal which is divided into two fields and subjected to interlace scanning, a video display having a horizontal display line number for one field. The liquid crystal panel, the optical rotation control liquid crystal panel, and the birefringent optical plate are used to move the display position in the vertical direction of the image by ½ of the horizontal display line interval for each field for interlaced display to reduce the number of pixels. The purpose of the present invention is to enable high-resolution display and downsizing of liquid crystal panels with few inexpensive liquid crystal panels.
【０００８】[0008]
【課題を解決するための手段】この目的を達成するため
に本発明の液晶インタ−レス表示装置は以下の構成を有
している。In order to achieve this object, the liquid crystal interface display device of the present invention has the following constitution.
【０００９】（１）光源からの光を画素ごとに開閉し映
像表示をおこなう映像表示液晶パネルと、映像表示液晶
パネルに対して光の入射側に配置した偏光子と出射側に
配置した検光子と、検光子の出射側に配置し検光子を通
過した直線偏光の偏光方向を映像信号のフィ−ルド周期
で非旋光、９０度旋光する旋光制御液晶パネルと、旋光
制御液晶パネルの出射側に配置し偏光方向により異なる
屈折率を示す複屈折性光学素子を備えた液晶インタ−レ
ス表示装置。(1) An image display liquid crystal panel that opens and closes light from a light source for each pixel to display an image, a polarizer arranged on the light incident side and an analyzer arranged on the light emission side of the image display liquid crystal panel. And a rotation control liquid crystal panel which is arranged on the emission side of the analyzer and rotates the polarization direction of the linearly polarized light passing through the analyzer by 90 degrees at the field period of the video signal, and on the emission side of the rotation control liquid crystal panel. A liquid crystal interlace display device provided with a birefringent optical element which is arranged and exhibits different refractive indexes depending on the polarization direction.
【００１０】（２）第一、第二の映像信号フィ−ルドメ
モリと奇数フィ−ルドでは第一の映像信号フィ−ルドメ
モリへの書き込みと第二の映像信号フィ−ルドメモリか
らの読み出しを行い、偶数フィ−ルドでは第一の映像信
号フィ−ルドメモリからの読み出しと第二の映像信号フ
ィ−ルドメモリへの書き込みを行い、書き込みに対して
読み出しを倍速でおこない、同時に読み出した倍速映像
信号に同期した倍速水平同期パルスと倍速垂直同期パル
スと倍速サンプリングクロックを発生し液晶パネルに入
力することにより１フィ−ルド期間に液晶パネルの水
平、垂直走査を二回おこなう走査変換制御回路と、二回
目の走査時に映像信号を消去するブランキング回路と、
一画素で構成した液晶パネルで全体の旋光制御を同時に
おこなう旋光制御液晶パネルを備えた液晶インタ−レス
表示装置。(2) In the first and second video signal field memories and the odd field, writing to the first video signal field memory and reading from the second video signal field memory are performed, and even In the field, reading from the first video signal field memory and writing to the second video signal field memory are performed, reading is performed at double speed for writing, and double speed synchronized with the simultaneously read double speed video signal. By generating a horizontal synchronizing pulse, a double speed vertical synchronizing pulse, and a double speed sampling clock and inputting them to the liquid crystal panel, a scan conversion control circuit that performs horizontal and vertical scanning of the liquid crystal panel twice in one field period, and at the time of the second scanning A blanking circuit that erases the video signal,
A liquid crystal interface display device equipped with an optical rotation control liquid crystal panel that simultaneously controls the optical rotation of the entire liquid crystal panel composed of one pixel.
【００１１】（３）フィ−ルド周期の電圧印加により偏
光方向の回転をおこなう電気光学効果を有する電気光学
結晶板を備えた液晶インタ−レス表示装置。(3) A liquid crystal interface display device provided with an electro-optic crystal plate having an electro-optic effect of rotating the polarization direction by applying a voltage of a field period.
【００１２】（４）水平ラインごとに一画素を構成し、
水平同期パルスで水平ラインごとに順次、旋光制御をお
こなう水平独立旋光制御液晶パネルを備えた液晶インタ
−レス表示装置。(4) One pixel is formed for each horizontal line,
A liquid crystal interface display device equipped with a horizontal independent optical rotation control liquid crystal panel that controls optical rotation sequentially for each horizontal line with a horizontal synchronization pulse.
【００１３】[0013]
【作用】この構成によって２フィ−ルドに分けてインタ
−レス走査した映像信号を表示する際に映像の垂直方向
の表示位置をフィ−ルドごとに水平表示ライン間隔の２
分の１だけ移動しインタ−レス表示することにより画素
数の少ない安価な液晶パネルで高解像度表示と液晶パネ
ルの小型化を可能とすることができる。With this configuration, when displaying an interlace-scanned video signal divided into two fields, the display position in the vertical direction of the video is divided into two horizontal display line intervals for each field.
It is possible to realize high resolution display and downsizing of the liquid crystal panel with an inexpensive liquid crystal panel having a small number of pixels by moving only one-half and performing interlace display.
【００１４】[0014]
【実施例】以下に本発明の実施例について図面を参照し
ながら説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１５】本発明の第一の実施例の基本光学系を図
１、旋光制御液晶パネル６の構造図を図２、駆動回路ブ
ロック図を図３、タイミング図を図４に示す。図１にお
いて１８は旋光制御液晶パネル、１９は複屈折性光学素
子である。図２において２０は液晶、２１はガラス基
板、１０、１１は透明電極である。図３において１２は
第一の映像信号フィ−ルドメモリ、１３は第二の映像信
号フィ−ルドメモリ、１４は走査変換制御回路、１５は
ブランキング回路、１６はＡＤ変換器、１７はＤＡ変換
器である。FIG. 1 shows the basic optical system of the first embodiment of the present invention, FIG. 2 is a structural diagram of the optical rotation control liquid crystal panel 6, FIG. 3 is a drive circuit block diagram, and FIG. 4 is a timing diagram. In FIG. 1, reference numeral 18 denotes a rotation control liquid crystal panel, and 19 denotes a birefringent optical element. In FIG. 2, 20 is a liquid crystal, 21 is a glass substrate, and 10 and 11 are transparent electrodes. In FIG. 3, 12 is a first video signal field memory, 13 is a second video signal field memory, 14 is a scan conversion control circuit, 15 is a blanking circuit, 16 is an AD converter, and 17 is a DA converter. is there.
【００１６】次ぎに第一の実施例の基本動作について説
明する。旋光制御液晶パネル１８は図２に示したように
液晶２０の両面全体を各々透明電極１０、１１で挟む構
造をしている。従って図４のｇに示す旋光制御液晶パネ
ル駆動信号ＤＤによりフィ−ルド周期で透明電極１０、
１１間の電圧をオン、オフすると液晶２０は入射光の非
旋光、９０度旋光を繰り返す。ここでオン時の電圧極性
は交互に正負反転して交流駆動する。以上により検光子
４を出たＰ成分（検光子４の偏光方向はＰ成分と一致さ
せるものとする）はフィ−ルド周期でＰ成分（非旋
光）、Ｓ成分（９０度旋光）に偏光方向が回転する。複
屈折性光学素子１９は水晶、方解石のような異方性結晶
を用いて結晶の光学軸の方向を設定すればＰ成分、Ｓ成
分に対する屈折率の相違から図１に示すようにＰ成分、
Ｓ成分の光を垂直方向に分離することができる。なお、
分離の間隔は複屈折性光学素子１９の厚みで設定する。
以上のようにして映像信号のインタ−レス走査に応じ、
奇数フィ−ルドに対する偶数フィ−ルドの映像を垂直方
向に水平表示ライン間隔の２分の１だけ移動することに
よりインタ−レス表示が可能である。スクリ−ン上での
表示例を図５に示す。Next, the basic operation of the first embodiment will be described. As shown in FIG. 2, the optical rotation control liquid crystal panel 18 has a structure in which the entire surface of the liquid crystal 20 is sandwiched between the transparent electrodes 10 and 11, respectively. Therefore, the transparent electrode 10 has a field cycle according to the optical rotation control liquid crystal panel drive signal DD shown in g of FIG.
When the voltage across 11 is turned on and off, the liquid crystal 20 repeats non-rotation of incident light and 90-degree rotation. Here, the voltage polarity at the time of turning on is alternately inverted, and AC drive is performed. As described above, the P component emitted from the analyzer 4 (the polarization direction of the analyzer 4 is made to match the P component) is polarized into the P component (non-optical rotation) and the S component (90 ° optical rotation) in the field cycle. Rotates. The birefringent optical element 19 is a P component if the direction of the optical axis of the crystal is set by using an anisotropic crystal such as quartz or calcite, and as shown in FIG.
The S component light can be separated in the vertical direction. In addition,
The separation interval is set by the thickness of the birefringent optical element 19.
As described above, according to the interlace scanning of the video signal,
Interlaced display is possible by moving the image of the even field with respect to the odd field in the vertical direction by ½ of the horizontal display line interval. An example of the display on the screen is shown in FIG.
【００１７】次ぎに映像表示液晶パネル２の駆動方法に
ついて説明する。図４ａ〜ｆのタイミング図に示すよう
に水平走査周波数１５．７５ＫＨｚ、垂直走査周波数６
０Ｈｚの映像信号に対して倍速走査変換した水平走査周
波数３１．５ＫＨｚ、垂直走査周波数１２０Ｈｚの映像
信号を映像表示液晶パネル２に入力し、１フィ−ルド期
間に２回水平、垂直走査をおこなう。ただし図４のｄに
示すように２回目の垂直走査時は映像信号は消去する。
なお、奇数、偶数フィ−ルドの水平走査線表示は従来と
同様に２４０本の水平表示ラインに重ね書きする。以上
のように映像表示液晶パネル２においては１フィ−ルド
の映像を表示し、一旦消去した後に次ぎのフィ−ルドを
表示し、旋光制御液晶パネル１８においてはフィ−ルド
の変わり目ごとにスクリ−ン上の垂直表示位置を移動す
ることで正確なインタ−レス表示が可能となる。ちなみ
に映像表示液晶パネル２を従来の方法で駆動した場合
は、例えば第一フィ−ルドで書き込みされた２４０本目
の水平表示ラインの映像は書き込み直後から第二フィ−
ルドで再び書き込まれるまで液晶に書き込み内容が保持
されるため、第一フィ−ルドの映像が大半の期間、第二
フィ−ルドの映像として垂直位置のずれた位置に誤って
表示されることになる。このような理由で本発明の倍速
駆動が必要である。なお図３の駆動回路ブロック図にお
いて第一の映像信号フィ−ルドメモリ１２と、第二の映
像信号フィ−ルドメモリ１３は奇数フィ−ルドと偶数フ
ィ−ルドで映像信号の書き込みと読み出しを交互におこ
なう。また読み出しクロックＲＣＫは書き込みクロック
ＷＣＫに対して倍速であり、１フィ−ルド期間に２回読
み出す。ブランキング回路１５は１フィ−ルド期間の２
回目の読み出しに対して映像信号を消去する。これらに
より図４のｄに示す倍速映像信号が得られる。走査変換
制御回路１４は前記のフィ−ルドメモリ書き込みクロッ
クＷＣＫ，読み出しクロックＲＣＫ、映像表示液晶パネ
ル２の水平垂直倍速走査に必要な倍速サンプリングクロ
ック２ＣＫ、倍速水平スタ−トパルス２ＳＨ，倍速ゲ−
トクロック２ＧＫ、倍速垂直スタ−トパルス２ＳＶを発
生する。Next, a method of driving the image display liquid crystal panel 2 will be described. The horizontal scanning frequency is 15.75 KHz and the vertical scanning frequency is 6 as shown in the timing charts of FIGS.
A video signal having a horizontal scanning frequency of 31.5 KHz and a vertical scanning frequency of 120 Hz obtained by double-speed scanning conversion of a video signal of 0 Hz is input to the video display liquid crystal panel 2, and horizontal and vertical scanning is performed twice in one field period. However, as shown in FIG. 4D, the video signal is erased during the second vertical scanning.
The horizontal scanning line display of odd and even fields is overwritten on 240 horizontal display lines as in the conventional case. As described above, one field image is displayed on the image display liquid crystal panel 2, the next field is displayed after being erased once, and the screen is displayed at each turn of the field on the optical rotation control liquid crystal panel 18. Accurate interlace display is possible by moving the vertical display position on the screen. By the way, when the image display liquid crystal panel 2 is driven by the conventional method, for example, the image of the 240th horizontal display line written in the first field immediately after the second field is written.
Since the written contents are retained in the liquid crystal until it is written again in the field, the image of the first field is erroneously displayed as the image of the second field in a position displaced from the vertical position for most of the time. Become. For this reason, the double speed drive of the present invention is necessary. In the drive circuit block diagram of FIG. 3, the first video signal field memory 12 and the second video signal field memory 13 alternately perform writing and reading of video signals in odd fields and even fields. .. Further, the read clock RCK has a speed double that of the write clock WCK and is read twice in one field period. The blanking circuit 15 has 2 in 1 field period.
The video signal is erased for the second reading. As a result, the double speed video signal shown in d of FIG. 4 is obtained. The scan conversion control circuit 14 includes the field memory write clock WCK, the read clock RCK, the double speed sampling clock 2CK necessary for the horizontal and vertical double speed scanning of the video display liquid crystal panel 2, the double speed horizontal start pulse 2SH, and the double speed gate.
2GK, and a double speed vertical start pulse 2SV are generated.
【００１８】本発明の第二の実施例は図１の旋光制御液
晶パネル１８の代わりにリン酸二水素カリウム（ＫＤ
Ｐ）の結晶板などの電気光学効果をもつ電気光学結晶板
１６を用いてフィ−ルド周期の電圧印加による偏光方向
の回転をおこなうものである。その他の構成と動作は第
一の実施例と同様である。The second embodiment of the present invention uses potassium dihydrogen phosphate (KD) instead of the optical rotation control liquid crystal panel 18 of FIG.
By using the electro-optic crystal plate 16 having an electro-optic effect such as the crystal plate of P), the polarization direction is rotated by applying a voltage with a field period. Other configurations and operations are similar to those of the first embodiment.
【００１９】本発明の第三の実施例は図１の旋光制御液
晶パネル１８の代わりに水平分離旋光制御液晶パネル１
７を用いるものである。水平分離旋光制御液晶パネル１
７は図６に示すように水平ラインごとの液晶の旋光が可
能なように、水平ラインごとに分離され、ゲ−トドライ
バ９で駆動する。すなわち映像表示液晶パネル２から水
平方向の画素分離を削除し、ソ−ス側電極を一つにした
構造をもつ。そして映像表示液晶パネル２の一つの水平
表示ラインの出射光が水平分離旋光制御液晶パネル１７
一つの水平ラインに入射するように映像表示液晶パネル
２に近接して配置する。第三の実施例では映像表示液晶
パネル２の駆動のタイミング図は図１０に示した従来例
と全く同等である。水平分離旋光制御液晶パネル１７の
駆動はソ−ス側については第一の実施例の旋光制御液晶
パネル駆動信号ＤＤと同等のものを用い、ゲ−ト側につ
いては映像表示液晶パネル２に入力するものと同じゲ−
トクロックＧＫと垂直スタ−トパルスＳＶを用いる。以
上により映像表示液晶パネル２の水平ライン表示に応じ
て１ラインごとに順次、スクリ−ン上の垂直表示位置を
移動しインタ−レス表示が可能となる。第三の実施例で
はＣＲＴディスプレィと同様に１ラインごとに垂直表示
位置を移動できるため正確なインタ−レス表示が可能で
あることは明白である。なお、ハイビジョン映像表示装
置としても本発明は極めて有効な手段を提供できるのは
言うまでもない。The third embodiment of the present invention is a horizontal separation optical rotation control liquid crystal panel 1 instead of the optical rotation control liquid crystal panel 18 of FIG.
7 is used. Horizontally separated optical rotation control liquid crystal panel 1
As shown in FIG. 6, 7 is separated for each horizontal line so that liquid crystal can be rotated for each horizontal line, and is driven by a gate driver 9. That is, it has a structure in which the pixel separation in the horizontal direction is eliminated from the image display liquid crystal panel 2 and only one source side electrode is provided. Then, the light emitted from one horizontal display line of the image display liquid crystal panel 2 is horizontally separated and rotated and controlled.
The image display liquid crystal panel 2 is arranged in proximity to one horizontal line. In the third embodiment, the timing chart for driving the image display liquid crystal panel 2 is exactly the same as that of the conventional example shown in FIG. The horizontal separation optical rotation control liquid crystal panel 17 is driven by using a signal equivalent to the optical rotation control liquid crystal panel drive signal DD of the first embodiment on the source side and input to the image display liquid crystal panel 2 on the gate side. The same game as
Tok clock GK and vertical start pulse SV are used. As described above, the vertical display position on the screen is sequentially moved line by line in accordance with the horizontal line display of the video display liquid crystal panel 2, and the interlace display becomes possible. In the third embodiment, since the vertical display position can be moved line by line as in the CRT display, it is clear that accurate interlaced display is possible. It is needless to say that the present invention can provide extremely effective means as a high-definition video display device.
【００２０】[0020]
【発明の効果】以上のように本発明によれば、映像の垂
直方向の表示位置をフィ−ルドごとに水平表示ライン間
隔の２分の１だけ移動しインタ−レス表示することによ
り画素数の少ないより安価な液晶パネルで高解像度表示
と液晶パネルの小型化を可能にすることができる。As described above, according to the present invention, the display position in the vertical direction of an image is moved by ½ of the horizontal display line interval for each field and the interlace display is performed to reduce the number of pixels. It is possible to realize high-resolution display and downsizing of the liquid crystal panel with a few less expensive liquid crystal panels.
【図１】本発明の第一の実施例における液晶インターレ
ス表示装置の基本光学系構成図FIG. 1 is a block diagram of a basic optical system of a liquid crystal interlace display device according to a first embodiment of the present invention.
【図２】本発明の第一の実施例における旋光制御液晶パ
ネルの構造図FIG. 2 is a structural diagram of an optical rotation control liquid crystal panel in the first embodiment of the present invention.
【図３】本発明の第一の実施例における駆動回路のブロ
ック図FIG. 3 is a block diagram of a drive circuit according to the first embodiment of the present invention.
【図４】本発明の第一の実施例の駆動タイミング図FIG. 4 is a drive timing chart of the first embodiment of the present invention.
【図５】本発明のスクリーン上の表示例を示す図FIG. 5 is a diagram showing a display example on the screen of the present invention.
【図６】本発明の第二の実施例における液晶インターレ
ス表示装置の水平分離旋光制御液晶パネルの構成図FIG. 6 is a configuration diagram of a horizontal separation optical rotation control liquid crystal panel of a liquid crystal interlace display device according to a second embodiment of the present invention.
【図７】従来の液晶ビデオプロジェックタの基本光学系
を示す構成図FIG. 7 is a block diagram showing a basic optical system of a conventional liquid crystal video projector.
【図８】従来のスクリーン上の表示例を示す図FIG. 8 is a diagram showing a display example on a conventional screen.
【図９】従来の液晶パネルの駆動回路のブロック図FIG. 9 is a block diagram of a conventional liquid crystal panel drive circuit.
【図１０】従来の駆動タイミング図FIG. 10 is a conventional drive timing chart.
２ 映像表示液晶パネル ３ 偏光子 ４ 検光子 １２ 第一の映像信号フィールドメモリ １３ 第二の映像信号フィールドメモリ １４ 走査変換制御回路 １５ ブランキング回路 １６ 電気光学結晶板 １７ 水平独立旋光制御液晶パネル １８ 旋光制御液晶パネル １９ 複屈折性光学素子 2 image display liquid crystal panel 3 polarizer 4 analyzer 12 first image signal field memory 13 second image signal field memory 14 scan conversion control circuit 15 blanking circuit 16 electro-optic crystal plate 17 horizontal independent optical rotation control liquid crystal panel 18 optical rotation Control liquid crystal panel 19 Birefringent optical element
Claims (4)
示をおこなう映像表示液晶パネルと、映像表示液晶パネ
ルに対して光の入射側に配置した偏光子と出射側に配置
した検光子と、検光子の出射側に配置し検光子を通過し
た直線偏光の偏光方向を映像信号のフィ−ルド周期で非
旋光、９０度旋光する旋光制御液晶パネルと、旋光制御
液晶パネルの出射側に配置し偏光方向により異なる屈折
率を示す複屈折性光学素子を備えた液晶インタ−レス表
示装置。1. An image display liquid crystal panel for opening and closing light from a light source for each pixel to display an image, a polarizer arranged on an incident side of light and an analyzer arranged on an exit side of the image display liquid crystal panel. , A rotation control liquid crystal panel that is arranged on the exit side of the analyzer and rotates the polarization direction of the linearly polarized light that has passed through the analyzer by 90 degrees in the field cycle of the video signal, and on the exit side of the rotation control liquid crystal panel. A liquid crystal interface display device including a birefringent optical element that exhibits different refractive indexes depending on the polarization direction.
と、奇数フィ−ルドでは第一の映像信号フィ−ルドメモ
リへの書き込みと第二の映像信号フィ−ルドメモリから
の読み出しを行い、偶数フィ−ルドでは第一の映像信号
フィ−ルドメモリからの読み出しと第二の映像信号フィ
−ルドメモリへの書き込みを行い、書き込みに対して読
み出しを倍速でおこない、同時に読み出した倍速映像信
号に同期した倍速水平同期パルスと倍速垂直同期パルス
と倍速サンプリングクロックを発生し液晶パネルに入力
することにより１フィ−ルド期間に液晶パネルの水平、
垂直走査を二回おこなう走査変換制御回路と、二回目の
走査時に映像信号を消去するブランキング回路と一画素
で構成した液晶パネルで全体の旋光制御を同時におこな
う旋光制御液晶パネルを備えた液晶インタ−レス表示装
置。2. In the first and second video signal field memories, and in the odd field, writing to the first video signal field memory and reading from the second video signal field memory are performed, and even number is performed. In the field, reading from the first video signal field memory and writing to the second video signal field memory are performed, reading is performed at double speed for writing, and double speed synchronized with the simultaneously read double speed video signal. The horizontal sync pulse, the double speed vertical sync pulse, and the double speed sampling clock are generated and input to the liquid crystal panel.
A liquid crystal interface equipped with a scan conversion control circuit that performs vertical scanning twice, a blanking circuit that erases the video signal during the second scan, and a liquid crystal panel configured by one pixel that simultaneously controls the overall optical rotation. -Less display device.
ルド周期の電圧印加により偏光方向の回転をおこなう電
気光学効果を有する電気光学結晶板を備えた請求項１、
２記載の液晶インタ−レス表示装置。3. A liquid crystal panel instead of the optical rotation control liquid crystal panel
2. An electro-optic crystal plate having an electro-optic effect that rotates the polarization direction by applying a voltage of a pulse period.
2. The liquid crystal interface display device according to 2.
ンごとに一画素を構成し、水平同期パルスで水平ライン
ごとに順次、旋光制御をおこなう水平独立旋光制御液晶
パネルを備えた請求項１、２記載の液晶インタ−レス表
示装置。4. A horizontal independent optical rotation control liquid crystal panel, which constitutes one pixel for each horizontal line and sequentially controls optical rotation for each horizontal line by a horizontal synchronizing pulse, instead of the optical rotation control liquid crystal panel. The liquid crystal interface display device described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08851592A JP3309422B2 (en) | 1992-04-09 | 1992-04-09 | LCD interlace display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08851592A JP3309422B2 (en) | 1992-04-09 | 1992-04-09 | LCD interlace display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05289044A true JPH05289044A (en) | 1993-11-05 |
| JP3309422B2 JP3309422B2 (en) | 2002-07-29 |
Family
ID=13944969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08851592A Expired - Fee Related JP3309422B2 (en) | 1992-04-09 | 1992-04-09 | LCD interlace display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3309422B2 (en) |
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| US6243055B1 (en) | 1994-10-25 | 2001-06-05 | James L. Fergason | Optical display system and method with optical shifting of pixel position including conversion of pixel layout to form delta to stripe pattern by time base multiplexing |
| US6816141B1 (en) | 1994-10-25 | 2004-11-09 | Fergason Patent Properties Llc | Optical display system and method, active and passive dithering using birefringence, color image superpositioning and display enhancement with phase coordinated polarization switching |
| US6061103A (en) * | 1995-01-20 | 2000-05-09 | Olympus Optical Co., Ltd. | Image display apparatus |
| JPH08194207A (en) * | 1995-01-20 | 1996-07-30 | Olympus Optical Co Ltd | Image display device |
| JPH0915548A (en) * | 1995-06-27 | 1997-01-17 | Olympus Optical Co Ltd | Display device |
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