JPH0228184U - - Google Patents
Info
- Publication number
- JPH0228184U JPH0228184U JP10661288U JP10661288U JPH0228184U JP H0228184 U JPH0228184 U JP H0228184U JP 10661288 U JP10661288 U JP 10661288U JP 10661288 U JP10661288 U JP 10661288U JP H0228184 U JPH0228184 U JP H0228184U
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- circuit
- liquid crystal
- crystal display
- input means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
Landscapes
- Liquid Crystal Display Device Control (AREA)
- Television Receiver Circuits (AREA)
- Transforming Electric Information Into Light Information (AREA)
Description
図面は本考案の一実施例を示すもので、第1図
は液晶表示式テレビジヨン受像機の全体の回路構
成を示すブロツク図、第2図は第1図におけるキ
ードAGC回路の詳細を示すブロツク図、第3図
a,bは一般的なビデオ信号用A/D変換回路の
動作点例を示す図、第4図a,bは第1図におけ
るビデオ信号用A/D変換回路の動作点例を示す
図、第5図はY検波回路の原理的構成を示す図、
第6図はコントラスト・コントロール回路のゲイ
ン特性を示す図、第7図a,bはY検波回路への
入力信号波形例を示す図である。
2……チユーナ、4……映像/音声検波回路、
5……ビデオスイツチ回路、11……Y検波回路
、12,15……コントラスト・コントロール回
路、13……Y信号処理回路、16……復調回路
、17〜19……A/D変換回路、20……表示
コントロール回路、21……液晶表示パネル、3
0……キードAGC回路、31……ゲイン・コン
トロールアンプ、32……バツフアアンプ、33
……LPF、34……シンク・チツプ・クランプ
回路、35……キーパルス付加回路、36……キ
ーパルス発生回路、37……ピークホールド回路
。
The drawings show one embodiment of the present invention; FIG. 1 is a block diagram showing the overall circuit configuration of a liquid crystal display television receiver, and FIG. 2 is a block diagram showing details of the keyed AGC circuit in FIG. 1. Figures 3a and 3b are diagrams showing examples of operating points of a general A/D conversion circuit for video signals, and Figures 4a and b are operating points of the A/D conversion circuit for video signals in Figure 1. A diagram showing an example, FIG. 5 is a diagram showing the principle configuration of a Y detection circuit,
FIG. 6 is a diagram showing the gain characteristics of the contrast control circuit, and FIGS. 7a and 7b are diagrams showing examples of input signal waveforms to the Y detection circuit. 2...Tuner, 4...Video/audio detection circuit,
5... Video switch circuit, 11... Y detection circuit, 12, 15... Contrast control circuit, 13... Y signal processing circuit, 16... Demodulation circuit, 17-19... A/D conversion circuit, 20 ... Display control circuit, 21 ... Liquid crystal display panel, 3
0... Keyed AGC circuit, 31... Gain control amplifier, 32... Buffer amplifier, 33
...LPF, 34...Sink chip clamp circuit, 35...Key pulse addition circuit, 36...Key pulse generation circuit, 37...Peak hold circuit.
Claims (1)
手段と、この入力手段により入力された映像信号
のレベルを一定レベルに調整するAGC回路と、
このAGC回路からの一定レベルに調整された映
像信号のコントラストを制御するコントラスト制
御手段と、このコントラスト制御手段からの映像
信号を液晶表示する表示手段とを具備したことを
特徴とする液晶表示式画像表示装置。 (2) 前記入力手段は、受信した映像信号と外部
入力される映像信号とを切換えることを特徴とす
る請求項(1)記載の液晶表示式画像表示装置。[Claims for Utility Model Registration] (1) An input means for switching and inputting multiple systems of video signals, and an AGC circuit for adjusting the level of the video signal inputted by the input means to a constant level;
A liquid crystal display type image comprising a contrast control means for controlling the contrast of the video signal adjusted to a constant level from the AGC circuit, and a display means for displaying the video signal from the contrast control means on a liquid crystal display. Display device. (2) The liquid crystal display type image display device according to claim (1), wherein the input means switches between a received video signal and an externally input video signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10661288U JPH0228184U (en) | 1988-08-12 | 1988-08-12 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10661288U JPH0228184U (en) | 1988-08-12 | 1988-08-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0228184U true JPH0228184U (en) | 1990-02-23 |
Family
ID=31340281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10661288U Pending JPH0228184U (en) | 1988-08-12 | 1988-08-12 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0228184U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000068926A1 (en) * | 1999-05-10 | 2000-11-16 | Matsushita Electric Industrial Co., Ltd. | Image display device and image display method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS625767B2 (en) * | 1977-02-18 | 1987-02-06 | Meinan Machinery Works | |
JPS62133875A (en) * | 1985-12-05 | 1987-06-17 | Casio Comput Co Ltd | Video signal a/d convertor |
-
1988
- 1988-08-12 JP JP10661288U patent/JPH0228184U/ja active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS625767B2 (en) * | 1977-02-18 | 1987-02-06 | Meinan Machinery Works | |
JPS62133875A (en) * | 1985-12-05 | 1987-06-17 | Casio Comput Co Ltd | Video signal a/d convertor |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000068926A1 (en) * | 1999-05-10 | 2000-11-16 | Matsushita Electric Industrial Co., Ltd. | Image display device and image display method |
US6795053B1 (en) | 1999-05-10 | 2004-09-21 | Matsushita Electric Industrial Co., Ltd. | Image display device and image display method |
US7265743B2 (en) | 1999-05-10 | 2007-09-04 | Matsushita Electric Industrial Co., Ltd. | Image display apparatus and image display method |
US7414608B2 (en) | 1999-05-10 | 2008-08-19 | Matsushita Electric Industrial Co., Ltd. | Image display apparatus and image display method |
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