JPS643631A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

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
Application number
JP15904687A
Other languages
Japanese (ja)
Inventor
Haruki Kinoshita
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP15904687A priority Critical patent/JPS643631A/en
Publication of JPS643631A publication Critical patent/JPS643631A/en
Pending legal-status Critical Current

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.
JP15904687A 1987-06-26 1987-06-26 Liquid crystal display device Pending JPS643631A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (9)

* Cited by examiner, † Cited by third party
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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