JPS644476U - - Google Patents
Info
- Publication number
- JPS644476U JPS644476U JP9985687U JP9985687U JPS644476U JP S644476 U JPS644476 U JP S644476U JP 9985687 U JP9985687 U JP 9985687U JP 9985687 U JP9985687 U JP 9985687U JP S644476 U JPS644476 U JP S644476U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- power supply
- temperature
- liquid crystal
- 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
- 230000007423 decrease Effects 0.000 claims 3
- 239000004973 liquid crystal related substance Substances 0.000 claims 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
第１図は本考案の一実施例を示す回路構成図、
第２図は第１図のＬＣＤ１４の温度に対するコン
トラスト比の変化を示す特性図、第３図は第１図
の定電圧回路１２の温度に対する出力電圧の変化
を示す特性図、第４図は第１図の電池１０の電圧
対定電圧回路１２の出力電圧の特性図、第５図は
従来の回路構成図である。
１０……電池、１１……制御回路、１２……定
電圧回路、１３……ＬＣＤ駆動回路、１４……Ｌ
ＣＤ。
FIG. 1 is a circuit diagram showing an embodiment of the present invention;
2 is a characteristic diagram showing changes in contrast ratio with respect to temperature of the LCD 14 in FIG. 1, FIG. 3 is a characteristic diagram showing changes in output voltage with respect to temperature of the constant voltage circuit 12 in FIG. 1, and FIG. FIG. 1 is a characteristic diagram of the voltage of the battery 10 versus the output voltage of the constant voltage circuit 12, and FIG. 5 is a conventional circuit configuration diagram. 10... Battery, 11... Control circuit, 12... Constant voltage circuit, 13... LCD drive circuit, 14... L
CD.
Claims (1)
なり、命令に基づいて被制御部を制御する制御回
路と、この制御回路の最低動作電圧より高めの電
圧でかつ温度の上昇にともない電圧の下がる温度
依存性の定電圧回路と、この定電圧回路により温
度特性に対する補償がなされ、前記電源の減電圧
時にはコントラストを小さくして減電圧を知らせ
る働きをする液晶表示器とからなる液晶表示器用
電源回路。 A battery power supply, a control circuit that is driven by this power supply and controls the controlled unit based on commands, and a temperature-dependent circuit that has a voltage higher than the minimum operating voltage of this control circuit and whose voltage decreases as the temperature rises. 1. A power supply circuit for a liquid crystal display device, which comprises a constant voltage circuit, and a liquid crystal display device, which compensates for temperature characteristics by the constant voltage circuit, and when the voltage of the power supply decreases, the contrast is reduced to notify the voltage decrease.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9985687U JPS644476U (en) | 1987-06-29 | 1987-06-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9985687U JPS644476U (en) | 1987-06-29 | 1987-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS644476U true JPS644476U (en) | 1989-01-11 |
Family
ID=31327403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9985687U Pending JPS644476U (en) | 1987-06-29 | 1987-06-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS644476U (en) |
-
1987
- 1987-06-29 JP JP9985687U patent/JPS644476U/ja active Pending
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