JPS643631A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPS643631A JPS643631A JP15904687A JP15904687A JPS643631A JP S643631 A JPS643631 A JP S643631A JP 15904687 A JP15904687 A JP 15904687A JP 15904687 A JP15904687 A JP 15904687A JP S643631 A JPS643631 A JP S643631A
- Authority
- JP
- Japan
- Prior art keywords
- back light
- liquid crystal
- display device
- crystal display
- light
- 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 extend the life of a back light without degrading display visibility by variably controlling the illuminance of the back light by an illumination control means according to the use condition of a liquid crystal display device. CONSTITUTION:The illumination control means 41 in addition to the liquid crystal display device 1 which has light transmittability from the rear side to the front side and the back light 2 which illuminates the display region of the liquid crystal display device 1 are provided. The illuminance of the back light 2 is variably controlled according to the use condition of the liquid crystal display device 1. Namely, this illumination control means 41 is subjected to the input operation by an operating switch 6 and outputs a supply instruction signal to a power supply circuit 3 to light the back light 2 only when the detection level of external light by an optical sensor 5 is below the prescribed value. The life of the back light 2 is thereby extended while the electric power consumption of the back light 2 is reduced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15904687A JPS643631A (en) | 1987-06-26 | 1987-06-26 | Liquid crystal display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15904687A JPS643631A (en) | 1987-06-26 | 1987-06-26 | Liquid crystal display device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS643631A true JPS643631A (en) | 1989-01-09 |
Family
ID=15685045
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15904687A Pending JPS643631A (en) | 1987-06-26 | 1987-06-26 | Liquid crystal display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS643631A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02309316A (en) * | 1989-05-25 | 1990-12-25 | Nec Corp | Liquid crystal display device |
JPH0369131U (en) * | 1989-11-09 | 1991-07-09 | ||
US5121233A (en) * | 1990-04-18 | 1992-06-09 | Harris Corporation | Multi-color display |
JPH059835U (en) * | 1991-07-19 | 1993-02-09 | マツクス株式会社 | Check mechanism in screw tightener |
US5416633A (en) * | 1991-10-31 | 1995-05-16 | Thomson-Csf | Twin-image binoculars |
WO2000079338A1 (en) * | 1999-06-23 | 2000-12-28 | Citizen Watch Co., Ltd. | Liquid crystal display |
-
1987
- 1987-06-26 JP JP15904687A patent/JPS643631A/en active Pending
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02309316A (en) * | 1989-05-25 | 1990-12-25 | Nec Corp | Liquid crystal display device |
JPH0369131U (en) * | 1989-11-09 | 1991-07-09 | ||
US5121233A (en) * | 1990-04-18 | 1992-06-09 | Harris Corporation | Multi-color display |
JPH059835U (en) * | 1991-07-19 | 1993-02-09 | マツクス株式会社 | Check mechanism in screw tightener |
US5416633A (en) * | 1991-10-31 | 1995-05-16 | Thomson-Csf | Twin-image binoculars |
WO2000079338A1 (en) * | 1999-06-23 | 2000-12-28 | Citizen Watch Co., Ltd. | Liquid crystal display |
EP1213601A1 (en) * | 1999-06-23 | 2002-06-12 | Citizen Watch Co. Ltd. | Liquid crystal display |
US6847428B1 (en) | 1999-06-23 | 2005-01-25 | Citizen Watch Co., Ltd. | Camera having a liquid crystal display device |
JP4508505B2 (en) * | 1999-06-23 | 2010-07-21 | シチズンホールディングス株式会社 | Liquid crystal display |
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