JPH01130116U - - Google Patents
Info
- Publication number
- JPH01130116U JPH01130116U JP2647388U JP2647388U JPH01130116U JP H01130116 U JPH01130116 U JP H01130116U JP 2647388 U JP2647388 U JP 2647388U JP 2647388 U JP2647388 U JP 2647388U JP H01130116 U JPH01130116 U JP H01130116U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- key input
- liquid crystal
- output voltage
- cathode tube
- 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 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
第１図は本考案の一実施例を示す透過型液晶の
冷陰極管駆動回路を示す電気回路図、第２図は本
考案の一実施例を示す透過型液晶の冷陰極管駆動
回路の動作を示すタイムチヤート、第３図は従来
の透過型液晶の冷陰極管駆動回路の一例を示す電
気回路図である。
１…パルス発生回路（高圧直流電圧発生手段）
、１０８…ＤＣ―ＤＣコンバータ、１０９…ＤＣ
―ＡＣインバータ、１１１…輝度調整回路、１１
２…冷陰極管、１１３…透過型液晶、１１５…Ｃ
ＰＵ本体回路、１１６…キーボード、１１７…電
源スイツチ。
Fig. 1 is an electrical circuit diagram showing a transmission type liquid crystal cold cathode tube drive circuit according to an embodiment of the present invention, and Fig. 2 is an electric circuit diagram showing a transmission type liquid crystal cold cathode tube drive circuit according to an embodiment of the present invention. FIG. 3 is an electrical circuit diagram showing an example of a conventional transmission type liquid crystal cold cathode tube drive circuit. 1...Pulse generation circuit (high voltage DC voltage generation means)
, 108...DC-DC converter, 109...DC
-AC inverter, 111...Brightness adjustment circuit, 11
2...cold cathode tube, 113...transmissive liquid crystal, 115...C
PU main circuit, 116...Keyboard, 117...Power switch.
Claims (1)
タで出力電圧調整をした後に、その出力電圧を印
加直流電圧に応じて交流出力電圧の振幅が変化す
るＤＣ―ＡＣインバータに印加し、その交流出力
を透過型液晶の背面側に配設した冷陰極管に印加
して輝度調整をする透過型液晶の冷陰極管駆動回
路において、 キーボード・電源スイツチ等のキー入力開始を
検出して所定の信号を発生するキー入力開始検出
手段と、 このキー入力開始検出手段からの発生信号に応
じて所定時間だけ上記ＤＣ―ＤＣコンバータから
高圧直流電圧を発生させる手段と、 を具備したことを特徴とする透過型液晶の冷陰
極管駆動回路。[Claim for Utility Model Registration] After adjusting the output voltage of a DC voltage using a DC-DC converter with variable output voltage, the output voltage is transferred to a DC-AC inverter whose amplitude of AC output voltage changes according to the applied DC voltage. In the cold-cathode tube drive circuit of the transmissive liquid crystal, which applies the AC output to the cold-cathode tube installed on the back side of the transmissive liquid crystal to adjust the brightness, the start of key input from the keyboard, power switch, etc. is detected. key input start detecting means for generating a predetermined signal from the key input start detecting means; and means for generating high voltage direct current voltage from the DC-DC converter for a predetermined time in response to the generated signal from the key input start detecting means. A transmission-type liquid crystal cold cathode tube drive circuit featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2647388U JPH01130116U (en) | 1988-02-29 | 1988-02-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2647388U JPH01130116U (en) | 1988-02-29 | 1988-02-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01130116U true JPH01130116U (en) | 1989-09-05 |
Family
ID=31248131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2647388U Pending JPH01130116U (en) | 1988-02-29 | 1988-02-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01130116U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012053094A1 (en) * | 2010-10-22 | 2012-04-26 | Ｎｅｃディスプレイソリューションズ株式会社 | Liquid crystal monitor |
-
1988
- 1988-02-29 JP JP2647388U patent/JPH01130116U/ja active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012053094A1 (en) * | 2010-10-22 | 2012-04-26 | Ｎｅｃディスプレイソリューションズ株式会社 | Liquid crystal monitor |
| CN103168268A (en) * | 2010-10-22 | 2013-06-19 | Nec显示器解决方案株式会社 | Liquid crystal monitor |
| CN103168268B (en) * | 2010-10-22 | 2016-03-02 | Nec显示器解决方案株式会社 | LCD monitor |
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