JPS5694413A - Constant-voltage circuit - Google Patents
Constant-voltage circuitInfo
- Publication number
- JPS5694413A JPS5694413A JP17305379A JP17305379A JPS5694413A JP S5694413 A JPS5694413 A JP S5694413A JP 17305379 A JP17305379 A JP 17305379A JP 17305379 A JP17305379 A JP 17305379A JP S5694413 A JPS5694413 A JP S5694413A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- liquid crystal
- constant
- voltage circuit
- temperature coefficient
- 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
Abstract
PURPOSE: To obtain a constant-voltage circuit having the negative temperature coefficient adapted to liquid crystal display, by using the forward voltage of the diode as the driving voltage of the liquid crystal display device.
CONSTITUTION: For the purpose of holding each effective voltage in an effective value for the threshold of liquid crystal, the constant-voltage circuit is required, and the Zener diode is used conventionally. The temperature characteristic of the Zener diode has a flat or slightly positive temperature coefficient for temperature change. Contrarily, the temperature coefficient of the forward voltage of the LED is negative, and it is utilized. As a result, the effective voltage is held in the effective value for the threshold of the liquid crystal.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17305379A JPS5694413A (en) | 1979-12-27 | 1979-12-27 | Constant-voltage circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17305379A JPS5694413A (en) | 1979-12-27 | 1979-12-27 | Constant-voltage circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5694413A true JPS5694413A (en) | 1981-07-30 |
Family
ID=15953335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17305379A Pending JPS5694413A (en) | 1979-12-27 | 1979-12-27 | Constant-voltage circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5694413A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4657347A (en) * | 1985-08-21 | 1987-04-14 | Tokyo Electric Co., Ltd. | Liquid crystal display with zener diode |
CN105027017A (en) * | 2013-06-20 | 2015-11-04 | 富士电机株式会社 | Reference voltage circuit |
-
1979
- 1979-12-27 JP JP17305379A patent/JPS5694413A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4657347A (en) * | 1985-08-21 | 1987-04-14 | Tokyo Electric Co., Ltd. | Liquid crystal display with zener diode |
CN105027017A (en) * | 2013-06-20 | 2015-11-04 | 富士电机株式会社 | Reference voltage circuit |
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