JPS5694413A - Constant-voltage circuit - Google Patents

Constant-voltage circuit

Info

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
Application number
JP17305379A
Other languages
Japanese (ja)
Inventor
Zenzo Oda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP17305379A priority Critical patent/JPS5694413A/en
Publication of JPS5694413A publication Critical patent/JPS5694413A/en
Pending legal-status Critical Current

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
JP17305379A 1979-12-27 1979-12-27 Constant-voltage circuit Pending JPS5694413A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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