JPH0179025U - - Google Patents
Info
- Publication number
- JPH0179025U JPH0179025U JP1987175960U JP17596087U JPH0179025U JP H0179025 U JPH0179025 U JP H0179025U JP 1987175960 U JP1987175960 U JP 1987175960U JP 17596087 U JP17596087 U JP 17596087U JP H0179025 U JPH0179025 U JP H0179025U
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- drive voltage
- crystal display
- segment
- generation 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
- 239000004973 liquid crystal related substance Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Liquid Crystal Display Device Control (AREA)
- Television Receiver Circuits (AREA)
Description
第１図は本考案の液晶表示装置の構成を示すブ
ロツク図、第２図は第１図の駆動電圧発生回路の
構成を示す回路図、第３図は第１図の液晶表示器
の要部を示す側面図、第４図は第１図のコントラ
スト制御回路の構成を示す回路図、第５図は第４
図要部の出力電圧特性を示す図、第６図は第１図
の動作状態を示すフローチヤートである。
１……液晶表示器、２……コモン駆動回路、３
……セグメント駆動回路、４……駆動電圧発生回
路、５，６……コントラスト検出用液晶セグメン
ト、８，９……発光素子、１０，１１……受光素
子、１５……制御回路。
FIG. 1 is a block diagram showing the configuration of the liquid crystal display device of the present invention, FIG. 2 is a circuit diagram showing the configuration of the drive voltage generation circuit shown in FIG. 1, and FIG. 3 is a main part of the liquid crystal display device shown in FIG. 1. 4 is a circuit diagram showing the configuration of the contrast control circuit in FIG. 1, and FIG. 5 is a side view showing the contrast control circuit in FIG.
FIG. 6 is a flowchart showing the operating state of FIG. 1, which is a diagram showing the output voltage characteristics of the main part. 1...Liquid crystal display, 2...Common drive circuit, 3
... segment drive circuit, 4 ... drive voltage generation circuit, 5, 6 ... liquid crystal segment for contrast detection, 8, 9 ... light emitting element, 10, 11 ... light receiving element, 15 ... control circuit.
Claims (1)
圧を発生する駆動電圧発生回路と、液晶表示器の
表示領域外に設けられたコントラスト検出用の常
時点灯される液晶セグメント及び常時不点灯の液
晶セグメントと、該液晶セグメントの各々に対向
して設けられた発光素子及び受光素子と、各々の
受光素子の出力差を検出し、この検出出力に応じ
て前記駆動電圧発生回路への供給電圧を調整する
コントラスト制御回路で構成したことを特徴とす
る液晶表示装置。 A liquid crystal display, a drive voltage generation circuit that generates a drive voltage to drive the display, a liquid crystal segment that is always lit for contrast detection, and a liquid crystal that is always unlit, provided outside the display area of the liquid crystal display. detecting the output difference between the segment, a light emitting element and a light receiving element provided opposite to each of the liquid crystal segments, and each light receiving element, and adjusting the voltage supplied to the drive voltage generation circuit according to this detected output. A liquid crystal display device comprising a contrast control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175960U JPH0179025U (en) | 1987-11-18 | 1987-11-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987175960U JPH0179025U (en) | 1987-11-18 | 1987-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0179025U true JPH0179025U (en) | 1989-05-26 |
Family
ID=31467732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987175960U Pending JPH0179025U (en) | 1987-11-18 | 1987-11-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0179025U (en) |
-
1987
- 1987-11-18 JP JP1987175960U patent/JPH0179025U/ja active Pending