JPS5492097A - Liquid crystal display unit - Google Patents
Liquid crystal display unitInfo
- 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
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
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)
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 |
-
1977
- 1977-12-29 JP JP15927977A patent/JPS5492097A/en active Pending
Cited By (2)
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 |
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