JPS6231278A - Liquid crystal display - Google Patents

Liquid crystal display

Info

Publication number
JPS6231278A
JPS6231278A JP17077185A JP17077185A JPS6231278A JP S6231278 A JPS6231278 A JP S6231278A JP 17077185 A JP17077185 A JP 17077185A JP 17077185 A JP17077185 A JP 17077185A JP S6231278 A JPS6231278 A JP S6231278A
Authority
JP
Japan
Prior art keywords
signal
drive circuit
liquid crystal
circuit
crystal display
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
Application number
JP17077185A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Tomizawa
富沢 義行
Takashi Ishii
孝 石井
Itsumi Sato
佐藤 逸三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba AVE Co Ltd
Original Assignee
Toshiba Corp
Toshiba Audio Video Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Audio Video Engineering Co Ltd filed Critical Toshiba Corp
Priority to JP17077185A priority Critical patent/JPS6231278A/en
Publication of JPS6231278A publication Critical patent/JPS6231278A/en
Pending legal-status Critical Current

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  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE:To enjoy a satisfactory picture by comparing a signal received by an antenna with a reference level in a level comparison circuit and by opening a switch when this signal goes below the reference level to prevent an output of a timing pulse generating circuit from being supplied to an X drive circuit and to a Y drive circuit. CONSTITUTION:A signal 10 and a signal 12 are outputted to a switch 21, and respective outputs are inputted to an X drive circuit 9 and a Y drive circuit 11. By the X drive circuit 9 and the Y drive circuit 11, a liquid crystal display 13 is operated. A video siganl 22 converted into an intermediate frequency by a tuner 2 is converted into a signal 24 proportional to an input electric wave by a detecting circuit 23. This signal 24 is compared with a reference level by a level comparison circuit 25 and when it is judged that it is below the reference level, namely, the condition of the electric wave is bad, a signal 26 for opening the switch 21 is outputted and in the case of other than that, the signal 26 for closing the switch 21 is outputted. Accordingly, on the liquid crystal display, a picture immediately before the condition of the electric wave becomes bad is successively displayed.

Description

【発明の詳細な説明】 〔発明の技術分野〕 この発明は、電波状態が悪化したときでも良好な画面を
表示できるようにした液晶表示装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a liquid crystal display device that can display a good screen even when radio wave conditions deteriorate.

〔発明の技術的背景〕[Technical background of the invention]

従来の液晶表示装置は第3図に示すように、アンテナ1
で受信した電波をチューナ2で選局し、ビデオ検波回路
3により映像信号4と同期信号5に分離し、映像信号4
は信号処理回路6により R−G−B信号に分解し、さ
らに液晶駆動に適した信号7に整形し、一方、同期信号
5はタイミングパルス発生回路8によりX駆動回路すを
動作させるのに適した信号IOとY駆動回路IIを動作
させるのに適した信号I2に変換し、X駆動回路9とY
駆動回路IOにより液晶ディスプレイ13を動作させて
いた。
A conventional liquid crystal display device has an antenna 1 as shown in FIG.
The tuner 2 tunes the received radio waves, and the video detection circuit 3 separates them into a video signal 4 and a synchronization signal 5.
is decomposed into R-G-B signals by a signal processing circuit 6 and further shaped into a signal 7 suitable for driving a liquid crystal, while a synchronizing signal 5 is processed by a timing pulse generation circuit 8 suitable for operating an X drive circuit. The signal IO and the signal I2 suitable for operating the Y drive circuit II are converted into the signal I2 suitable for operating the X drive circuit 9 and the Y drive circuit II.
The liquid crystal display 13 was operated by the drive circuit IO.

〔背景技術の問題点〕[Problems with background technology]

しかし、このような従来の液晶表示装置では、受像機の
移動などによりミ波状態が一時的に悪くなると画像が乱
れたシ、色が再現できなくなったシ1、最悪の場合には
画像が全く表示されず、実際目が疲れ、非常に不快であ
る。
However, in such conventional liquid crystal display devices, if the microwave condition temporarily worsens due to the movement of the receiver, the image may become distorted, colors may no longer be reproduced, or in the worst case, the image may not be displayed at all. It is not visible and is actually eye straining and very uncomfortable.

〔発明の目的〕[Purpose of the invention]

この発明は、上記従来の欠点を除去するためになされた
もので、短時間の電波状態の悪化に対して、電波状態悪
化直前の画像を保持し、乱れた画像を表示しないように
できる液晶表示装置を提供することを目的とする。
This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology, and the present invention is a liquid crystal display that can maintain an image immediately before the radio wave condition deteriorates and not display a distorted image even when the radio wave condition deteriorates for a short period of time. The purpose is to provide equipment.

〔発明の概要〕[Summary of the invention]

この発明の液晶表示装置は、アンテナで受信した信号を
ビデオ検波回路で検波して映像信号と同期信号に分離し
、この映像信号によ#)X駆動回路を動作させ同期信号
によりタイミング・ぞルス発生回路でX駆動回路とY駆
動回路を動作させ、このX駆動回路とY駆動回路により
液晶ディスプレイのX側とY側の電極を駆動し、アンテ
ナで受信した信号をレベル比較回路で基準レベルと比較
してこの信号が基準レベル以下になるとスイッチを開い
てタイミングパルス発生回路の出力をX駆動回路とY駆
動回路へ供給するのを阻止して、液晶ディスプレイがと
のX駆動回路とY駆動回路の動作停止直前の映像信号を
連続表示するようにしたものである。
In the liquid crystal display device of the present invention, a signal received by an antenna is detected by a video detection circuit and separated into a video signal and a synchronization signal. The generation circuit operates the X drive circuit and the Y drive circuit, which drive the X and Y side electrodes of the liquid crystal display, and the level comparison circuit compares the signal received by the antenna with the reference level. When this signal becomes below the reference level, the switch is opened to prevent the output of the timing pulse generation circuit from being supplied to the X drive circuit and Y drive circuit. The video signal immediately before the operation stops is continuously displayed.

〔発明の実施例〕[Embodiments of the invention]

以下図面に基づいてこの発明の液晶表示装置の実施例を
説明する。第1図はその一実施例の構成を示すブロック
図である。この第1図において、第3図と同一部分に同
一符号を付して説明する。
Embodiments of the liquid crystal display device of the present invention will be described below based on the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment. In FIG. 1, the same parts as in FIG. 3 are given the same reference numerals and will be explained.

この第1図において、アンテナIで受信した電波をチー
−す2で選局し、ビデオ検波回路3により映像信号4と
同期信号5に分離する。
In FIG. 1, radio waves received by an antenna I are tuned by a tuner 2, and separated into a video signal 4 and a synchronization signal 5 by a video detection circuit 3.

映像信号4は信号処理回路6によりR−G・B信号に分
離し、さらに液晶駆動に適した信号7に整形する。
The video signal 4 is separated into R, G, and B signals by a signal processing circuit 6, and further shaped into a signal 7 suitable for driving a liquid crystal.

一方、同期信号5はタイミングパルス発生回路8により
X駆動回路9を動作させるのに適した信号10とY駆動
回路11を動作させるのに適した信号I2に変換する。
On the other hand, the synchronizing signal 5 is converted by the timing pulse generating circuit 8 into a signal 10 suitable for operating the X drive circuit 9 and a signal I2 suitable for operating the Y drive circuit 11.

以上までの点は第3図と同様であシ、以下に述べる部分
が第3図とは異なシ、この発明の特徴をなす部分である
The points up to this point are the same as those in FIG. 3, but the parts described below are different from those in FIG. 3 and are the features of the present invention.

すなわち、この信号゛10と信号12はスイッチ゛2I
に出力され、それぞれの出力がX“駆動回路9とY駆動
回路IIに入力される。このX駆動回路9とY駆動回路
11により液晶ディスプレイ’I 3を動作させる。 
−・   −また、上記チューナ2により中間周波数に
変換された映像信号22は、検波回路23により入力電
波に比例した信号24に変換される。この信号24はレ
ベル比較回路25により基準レベルと比較し、基準レベ
ル以下、す込わち電波状態が悪いと判断した場合はスイ
ッチ21を開く信号26を出力し、それ・以外の場合は
スイッチ2Iを閉じる信号2−6を出力する。′第2図
にアクティブマトリクス駆動液晶ディスプレイの動作原
理を示す=この駆動方式では、走査電極3Ia〜3Ic
と信号電極’32 a 〜32 cがマトリクス状に並
び、その交点に液晶層34h是34fを゛駆動するため
のトランジスタ゛”33 a〜33fが接続されている
That is, the signals 10 and 12 are connected to the switch 2I.
The respective outputs are input to the X drive circuit 9 and the Y drive circuit II.The X drive circuit 9 and the Y drive circuit 11 operate the liquid crystal display I3.
--Furthermore, the video signal 22 converted into an intermediate frequency by the tuner 2 is converted by the detection circuit 23 into a signal 24 proportional to the input radio wave. This signal 24 is compared with a reference level by a level comparison circuit 25, and if it is determined that it is below the reference level, that is, the radio wave condition is poor, it outputs a signal 26 that opens the switch 21. Otherwise, it outputs a signal 26 that opens the switch 21. Outputs signal 2-6 to close. 'Figure 2 shows the operating principle of an active matrix drive liquid crystal display = In this drive system, scanning electrodes 3Ia to 3Ic
and signal electrodes 32a to 32c are arranged in a matrix, and transistors 33a to 33f for driving the liquid crystal layers 34h to 34f are connected to the intersections thereof.

選択された走査電極(たとえばJIm )に接続された
トランジスタ33h〜33cのダートに走査パルスを印
加することによってトランジスタ33a〜33cmをオ
ン状態にする。
Transistors 33a to 33cm are turned on by applying a scan pulse to the darts of transistors 33h to 33c connected to a selected scan electrode (for example, JIm).

′この走査・やルスに同期した映像信号によって振幅変
調されたノ4ルスが信号電極32a〜32aからトラン
ジスタ33a〜33cのドレインに印加され、さらにト
ランジスタのドレインからソースを通って液晶層34&
〜34cに印加され、液晶層34a〜34cに電荷が蓄
積される。
'A signal whose amplitude is modulated by a video signal synchronized with the scanning pulse is applied from the signal electrodes 32a to 32a to the drains of the transistors 33a to 33c, and further passes from the drain to the source of the transistor to the liquid crystal layer 34&
34c, and charges are accumulated in the liquid crystal layers 34a to 34c.

走査電極が選択されなくなると、トランジスタ33h〜
33eはオフ状態となシ、とのト“ランジスタのオフ抵
抗と液晶層341Q−U 4 cの容量とによって決定
される時定数で、蓄積されている電荷が放電し終わるま
で、液晶層348〜34cには電圧が印加され続ける。
When the scan electrode is no longer selected, the transistors 33h~
33e is a time constant determined by the off resistance of the transistor when it is in the off state and the capacitance of the liquid crystal layer 341Q-U4c, and the liquid crystal layers 348 to 348 remain in the off state until the accumulated charge is completely discharged. A voltage continues to be applied to 34c.

 ” −”テレビ信号を表示する場合、この2時定数は
次の走査が打力われるまで(普通は1フレ一入同期)電
荷を蓄積するように選ばれてい右。
``-'' When displaying a television signal, these two time constants are chosen to accumulate charge until the next scan is applied (usually one frame per input synchronization).

この発明では、検波回路23で映像信号22を検波した
信号24と基準レベルがレベル比較回路25で比較され
ておシ、この信号24が基準レベル以下となって、電波
状態が悪くなったと判断したとき、レベル比較回路25
がら出力される信号26によりスイッチ2Iを開いて、
Y駆動回路IIの動作を停止し、走査電極を非選択状態
にすることによりすべてのトランジスタをオフ状態とす
る。
In this invention, the signal 24 detected from the video signal 22 by the detection circuit 23 is compared with the reference level in the level comparison circuit 25, and when this signal 24 becomes below the reference level, it is determined that the radio wave condition has deteriorated. When the level comparison circuit 25
The switch 2I is opened by the signal 26 outputted from the
All transistors are turned off by stopping the operation of the Y drive circuit II and making the scanning electrodes non-selected.

前記のように、この状態では液晶層に蓄積され念電荷は
トランジスタのオフ抵抗と液晶層の容量とによって決定
される時定数の期間保持されるので、液晶ディスプレイ
には電波状態が悪くなる直前に表示されていた画像が表
示され続ける。
As mentioned above, in this state, the psychic charges accumulated in the liquid crystal layer are held for a time constant determined by the off-resistance of the transistor and the capacitance of the liquid crystal layer. The image that was displayed continues to be displayed.

な゛お、この発明の他の応用例として、スイッチを動作
する信号26を、電波状態が良好なときでも、外部から
操作することによって画像を一時的にメモすることが可
能である。
In addition, as another application example of the present invention, it is possible to temporarily record an image by operating the signal 26 for operating the switch from the outside even when the radio wave condition is good.

このようにすることによって、見たい画像をいつでも一
時的に停止することができ、画像からメモなどを取るこ
とが容易になる。
By doing this, you can temporarily stop viewing the image you want to view at any time, and it becomes easy to take notes from the image.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、この発明の液晶表示装置によれば
、アクティブマ) IJクス駆動方式の原理を応用した
ものだから、追加回路が少なく、比較的容易な変更で、
電波状態が一時的に悪化しても乱れた画面を見ることが
なく良好な画像を楽しむことができる。
As explained above, since the liquid crystal display device of the present invention applies the principle of the active polymer (IJ) drive system, it requires few additional circuits and can be changed relatively easily.
Even if the radio wave condition temporarily deteriorates, you can enjoy a good image without seeing a distorted screen.

また、電波状態が良好なときでも画像を一時的に停止で
き、画像からメモなどを取ることができ、安価なメモリ
化わシに使用することができる。
In addition, even when radio wave conditions are good, images can be temporarily stopped and notes can be taken from the images, making it possible to use them as inexpensive memory devices.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の液晶表示装置の一実施例の構成を示
すブロック図、第2図はこの発明の液晶表示装置におけ
る液晶ディスプレイとして使用されるアクティブマトリ
クス駆動液晶ディスプレイの動作原理を示す図、第3図
は従来の液晶表示装置の構成を示すブロック図である。 !・・・アンテナ、2・・・チューナ、3・・・ビデオ
検波回路、6・・・信号処理回路、8・・・タイミング
ノ9ルス発生回路、9・・・X駆動回路、11・・・Y
駆動回路、I3・・・液晶ディスプレイ、21・・・ス
イッチ、23・・・検波回路、25・・・レベル比較回
路。 −出願人代理人  弁理士 鈴 江 武 彦第2WJ 第3因
FIG. 1 is a block diagram showing the configuration of an embodiment of the liquid crystal display device of the present invention, and FIG. 2 is a diagram showing the operating principle of an active matrix drive liquid crystal display used as a liquid crystal display in the liquid crystal display device of the present invention. FIG. 3 is a block diagram showing the configuration of a conventional liquid crystal display device. ! ...Antenna, 2...Tuner, 3...Video detection circuit, 6...Signal processing circuit, 8...Timing noise generation circuit, 9...X drive circuit, 11... Y
Drive circuit, I3...Liquid crystal display, 21...Switch, 23...Detection circuit, 25...Level comparison circuit. - Applicant's agent Patent attorney Suzue Takehiko 2nd WJ 3rd cause

Claims (1)

【特許請求の範囲】[Claims] アンテナで受信した信号を検波して映像信号と同期信号
に分離して出力するビデオ検波回路と、上記映像信号に
より液晶ビデオディスプレイのX側電極を駆動するX駆
動回路と、上記同期信号により上記X駆動回路と上記液
晶ビデオディスプレイのY側の電極を駆動するY駆動回
路を駆動する信号を出力するタイミングパルス発生回路
と、上記アンテナで受信した信号を基準レベルと比較す
るレベル比較回路と、このレベル比較回路の比較の結果
上記アンテナで受信した信号が基準レベル以下のとき上
記液晶表示ディスプレイにX駆動回路とY駆動回路との
動作停止直前の映像信号を連続表示するように上記タイ
ミングパルス発生回路の出力の上記X駆動回路とY駆動
回路への供給を阻止するスイッチとを具備した液晶表示
装置。
a video detection circuit that detects the signal received by the antenna, separates it into a video signal and a synchronization signal, and outputs the same; an X drive circuit that drives the X side electrode of the liquid crystal video display using the video signal; a timing pulse generation circuit that outputs a signal to drive the drive circuit and the Y drive circuit that drives the Y-side electrode of the liquid crystal video display; a level comparison circuit that compares the signal received by the antenna with a reference level; The timing pulse generation circuit is configured to continuously display the video signal immediately before the operation of the X drive circuit and the Y drive circuit stops on the liquid crystal display when the signal received by the antenna is below the reference level as a result of comparison by the comparison circuit. A liquid crystal display device comprising a switch for blocking the supply of output to the X drive circuit and the Y drive circuit.
JP17077185A 1985-08-02 1985-08-02 Liquid crystal display Pending JPS6231278A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17077185A JPS6231278A (en) 1985-08-02 1985-08-02 Liquid crystal display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17077185A JPS6231278A (en) 1985-08-02 1985-08-02 Liquid crystal display

Publications (1)

Publication Number Publication Date
JPS6231278A true JPS6231278A (en) 1987-02-10

Family

ID=15911069

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17077185A Pending JPS6231278A (en) 1985-08-02 1985-08-02 Liquid crystal display

Country Status (1)

Country Link
JP (1) JPS6231278A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7479939B1 (en) 1991-02-16 2009-01-20 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59225682A (en) * 1983-06-07 1984-12-18 Seiko Epson Corp Liquid crystal display television receiver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59225682A (en) * 1983-06-07 1984-12-18 Seiko Epson Corp Liquid crystal display television receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7479939B1 (en) 1991-02-16 2009-01-20 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device

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