JPS5492097A - Liquid crystal display unit - Google Patents

Liquid crystal display unit

Info

Publication number
JPS5492097A
JPS5492097A JP15927977A JP15927977A JPS5492097A JP S5492097 A JPS5492097 A JP S5492097A JP 15927977 A JP15927977 A JP 15927977A JP 15927977 A JP15927977 A JP 15927977A JP S5492097 A JPS5492097 A JP S5492097A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal display
voltage
output
display unit
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
JP15927977A
Other languages
Japanese (ja)
Inventor
Atsushi Kamata
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 Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP15927977A priority Critical patent/JPS5492097A/en
Publication of JPS5492097A publication Critical patent/JPS5492097A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To increase the life time of the cell by switching off the application voltage to the liquid crystal display element when the reading is impossible.
CONSTITUTION: When the output of photo detector 1 is large, the output of voltage comparator 3 is supplied to control circuit 7 via switch circuit 6. And the driving voltage of generator 8 is applied to liquid crystal display element 9. On the other hand, when the output of detector 1 is small, the driving voltage is turned off at control circuit 7 and not applied to element 9. In case lighting signal 5 is supplied for lamp 10 when no voltage is applied to element 9, the driving voltage is applied to element 9 through operation of circuit 6 and 7.
COPYRIGHT: (C)1979,JPO&Japio
JP15927977A 1977-12-29 1977-12-29 Liquid crystal display unit Pending JPS5492097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15927977A JPS5492097A (en) 1977-12-29 1977-12-29 Liquid crystal display unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15927977A JPS5492097A (en) 1977-12-29 1977-12-29 Liquid crystal display unit

Publications (1)

Publication Number Publication Date
JPS5492097A true JPS5492097A (en) 1979-07-20

Family

ID=15690308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15927977A Pending JPS5492097A (en) 1977-12-29 1977-12-29 Liquid crystal display unit

Country Status (1)

Country Link
JP (1) JPS5492097A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887551A (en) * 1981-11-20 1983-05-25 Nippon Kogaku Kk <Nikon> Display of camera
JPS6380579A (en) * 1986-09-24 1988-04-11 Nec Corp Light source device circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887551A (en) * 1981-11-20 1983-05-25 Nippon Kogaku Kk <Nikon> Display of camera
JPS6380579A (en) * 1986-09-24 1988-04-11 Nec Corp Light source device circuit

Similar Documents

Publication Publication Date Title
JPS52128100A (en) Driver circuit
JPS5324798A (en) Driving circuit of electrochromic display device
JPS52142992A (en) Driving circuit for electrochromic display device
JPS5492097A (en) Liquid crystal display unit
JPS5438165A (en) Electronic watch
JPS52100997A (en) Display control system
JPS5357876A (en) Watch with battery life warning display
JPS542096A (en) Drive unit for liquid crystal matrix panel
JPS51146249A (en) Liquid crystal glasses
JPS5529728A (en) Battery life display unit of electronic watch
JPS5469027A (en) Liquid crystal driving system
JPS5429520A (en) Drive system of bias light
JPS5319789A (en) Electrochromic display device
JPS53149349A (en) Display device
JPS5371874A (en) Voltage detection display circuit
JPS5629467A (en) Inverter device
JPS5533645A (en) Electronic watch with power source compensating function
JPS5679283A (en) Timepiece having alarm
JPS5526481A (en) Electronic watch
JPS5340297A (en) Driving system of liquid crystal display unit
JPS5284998A (en) Driving circuit for liquid crystal display
JPS52149494A (en) Liquid crystal display device
JPS553025A (en) Electronic apparatus
JPS5562385A (en) Battery life announcing watch
JPS57147622A (en) Portable camera with electronic clock