JPH0442631U - - Google Patents
Info
- Publication number
- JPH0442631U JPH0442631U JP8498090U JP8498090U JPH0442631U JP H0442631 U JPH0442631 U JP H0442631U JP 8498090 U JP8498090 U JP 8498090U JP 8498090 U JP8498090 U JP 8498090U JP H0442631 U JPH0442631 U JP H0442631U
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- circuit
- brightness
- power
- 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
Links
- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Liquid Crystal Display Device Control (AREA)
Description
第１図は本考案の一実施例を示すブロツク図、
第２図は第１図のマイクロコンピユータの出力の
パルス波形図、第３図は第１図の具体化した一実
施例の回路図、第４図は第３図の機能を説明する
ためのパルス波形及び電圧の特性図、第５図は従
来の一例の最も簡単な輝度調節回路を示す回路図
である。
１……可変抵抗器、４……マイクロコンピユー
タ、５……ホツトカプラ回路、６……整流回路、
７……電力増巾回路、８……液晶表示器、９……
−２０Ｖ定電圧、２０……ホツトカプラ、２１，
２２，２３，２６……抵抗器、２４……コンデン
サ、２５……トランジスタ。
FIG. 1 is a block diagram showing an embodiment of the present invention.
Fig. 2 is a pulse waveform diagram of the output of the microcomputer shown in Fig. 1, Fig. 3 is a circuit diagram of an embodiment of Fig. 1, and Fig. 4 is a pulse waveform diagram for explaining the function of Fig. 3. FIG. 5 is a circuit diagram showing a conventional example of the simplest brightness adjustment circuit. 1... Variable resistor, 4... Microcomputer, 5... Hot coupler circuit, 6... Rectifier circuit,
7... Power amplification circuit, 8... Liquid crystal display, 9...
-20V constant voltage, 20...Hot coupler, 21,
22, 23, 26...Resistor, 24...Capacitor, 25...Transistor.
Claims (1)
せ、液晶表面の輝度を調節する回路において、マ
イクロコンピユータのパルス発振出力をホツトカ
プラ回路により絶縁し、整流回路を通した電圧信
号をトランジスタにより電力増巾し、その電力増
巾した電圧を液晶駆動用電源に接続して液晶表面
の輝度を調節するよう構成したことを特徴とする
液晶表示器用輝度調節回路。 In a circuit that changes the value of the power supply voltage for driving the liquid crystal of a liquid crystal display and adjusts the brightness of the liquid crystal surface, the pulse oscillation output of the microcomputer is isolated by a hot coupler circuit, and the voltage signal passed through the rectifier circuit is increased in power by a transistor. 1. A brightness adjustment circuit for a liquid crystal display device, characterized in that the brightness of a liquid crystal surface is adjusted by connecting the power amplified voltage to a liquid crystal driving power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8498090U JPH0442631U (en) | 1990-08-10 | 1990-08-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8498090U JPH0442631U (en) | 1990-08-10 | 1990-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0442631U true JPH0442631U (en) | 1992-04-10 |
Family
ID=31633827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8498090U Pending JPH0442631U (en) | 1990-08-10 | 1990-08-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0442631U (en) |
-
1990
- 1990-08-10 JP JP8498090U patent/JPH0442631U/ja active Pending