JPH0179027U - - Google Patents
Info
- Publication number
- JPH0179027U JPH0179027U JP1987175959U JP17595987U JPH0179027U JP H0179027 U JPH0179027 U JP H0179027U JP 1987175959 U JP1987175959 U JP 1987175959U JP 17595987 U JP17595987 U JP 17595987U JP H0179027 U JPH0179027 U JP H0179027U
- Authority
- JP
- Japan
- Prior art keywords
- variable resistor
- sensitive element
- lcd
- power
- adjustment circuit
- 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
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Liquid Crystal Display Device Control (AREA)
- Television Receiver Circuits (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
第１図は本考案のコントラスト調整回路の構成
を示す回路図、第２図、第３図は第１図の要部素
子の特性を示す図、第４図は第１図要部の出力電
圧特性を示す図、第５図は従来例を示す回路図で
ある。
１……トランジスタ、２……可変抵抗器、３…
…駆動電圧発生回路、４……ポジスタ、５……サ
ーミスタ。
Figure 1 is a circuit diagram showing the configuration of the contrast adjustment circuit of the present invention, Figures 2 and 3 are diagrams showing the characteristics of the main elements in Figure 1, and Figure 4 is the output voltage of the main parts in Figure 1. FIG. 5, which is a diagram showing characteristics, is a circuit diagram showing a conventional example. 1...transistor, 2...variable resistor, 3...
...Drive voltage generation circuit, 4...Posistor, 5...Thermistor.
Claims (1)
ス電位の変更により導通度が制御されるトランジ
スタと、該トランジスタを介して電源が供給され
たＬＣＤ駆動用の電圧を発生する駆動電圧発生回
路よりなり、可変抵抗器の調整によりＬＣＤのコ
ントラストを調整するコントラスト調整回路に於
いて、可変抵抗器の一端と一方の電源間に温度に
対する抵抗値が正特性の温度感応素子を接続し且
つ他端と他方の電源間に負特性の温度感応素子を
接続して構成したことを特徴とするコントラスト
調整回路。 Consisting of a transistor whose conductivity is controlled by changing the base potential by a variable resistor connected between the power supplies, and a drive voltage generation circuit that generates a voltage for driving the LCD supplied with power through the transistor, In a contrast adjustment circuit that adjusts the contrast of an LCD by adjusting a variable resistor, a temperature sensitive element with a positive temperature resistance value is connected between one end of the variable resistor and one power supply, and A contrast adjustment circuit characterized in that it is configured by connecting a temperature sensitive element with a negative characteristic between power supplies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175959U JPH0179027U (en) | 1987-11-18 | 1987-11-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175959U JPH0179027U (en) | 1987-11-18 | 1987-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0179027U true JPH0179027U (en) | 1989-05-26 |
Family
ID=31467731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987175959U Pending JPH0179027U (en) | 1987-11-18 | 1987-11-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0179027U (en) |
-
1987
- 1987-11-18 JP JP1987175959U patent/JPH0179027U/ja active Pending