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JPH024221A - Liquid crystal backlight controller - Google Patents

Liquid crystal backlight controller

Info

Publication number
JPH024221A
JPH024221A JP63154430A JP15443088A JPH024221A JP H024221 A JPH024221 A JP H024221A JP 63154430 A JP63154430 A JP 63154430A JP 15443088 A JP15443088 A JP 15443088A JP H024221 A JPH024221 A JP H024221A
Authority
JP
Japan
Prior art keywords
hole
liquid crystal
device
crystal display
photodetecting
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
JP63154430A
Inventor
Toshiaki Miyazaki
Original Assignee
Nec 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 Nec Corp filed Critical Nec Corp
Priority to JP63154430A priority Critical patent/JPH024221A/en
Publication of JPH024221A publication Critical patent/JPH024221A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE: To prevent the waste of a battery power source by providing a photodetector which responds to visible light on the bottom part of a photodetecting hole having an opening part on the liquid crystal display surface side of a liquid crystal plate holding tool.
CONSTITUTION: There is a hole-like photodetecting hole 5 on a liquid crystal display surface 7, and there is a photodetecting device 6 on the bottom part of the hole 5. A shape of the hole 5 is like a hole, and structured so that only a light beam from the direction C vertical to the liquid crystal display surface 7 reaches directly the device 6. The output of the device 6 is brought to current amplification by an amplifier 9, inputted to a control terminal 10a of a lighting control part 10, and controls opening/closing of a switch 10b. A backlight 4 is driven by a backlight use power source 11. In such a case, sensitivity of the amplifier 9 is set so as to close the switch 10b of the lighting control part 10, when an external light by which the display contents of a liquid crystal display device 2 can be read enough even if the backlight 4 is turned off is made incident directly on the device 6. In such a way, waste of a battery power source can be prevented.
COPYRIGHT: (C)1990,JPO&Japio
JP63154430A 1988-06-21 1988-06-21 Liquid crystal backlight controller Pending JPH024221A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63154430A JPH024221A (en) 1988-06-21 1988-06-21 Liquid crystal backlight controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63154430A JPH024221A (en) 1988-06-21 1988-06-21 Liquid crystal backlight controller

Publications (1)

Publication Number Publication Date
JPH024221A true JPH024221A (en) 1990-01-09

Family

ID=15584010

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63154430A Pending JPH024221A (en) 1988-06-21 1988-06-21 Liquid crystal backlight controller

Country Status (1)

Country Link
JP (1) JPH024221A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5511201A (en) * 1991-03-26 1996-04-23 Hitachi, Ltd. Data processing apparatus, power supply controller and display unit
US7120809B2 (en) 1990-03-23 2006-10-10 Matsushita Electric Industrial Co., Ltd. Data processing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7120809B2 (en) 1990-03-23 2006-10-10 Matsushita Electric Industrial Co., Ltd. Data processing apparatus
US7821489B2 (en) 1990-03-23 2010-10-26 Panasonic Corporation Data processing apparatus
US5511201A (en) * 1991-03-26 1996-04-23 Hitachi, Ltd. Data processing apparatus, power supply controller and display unit

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