JPH0253040A - Lcd iluminator for camera - Google Patents

Lcd iluminator for camera

Info

Publication number
JPH0253040A
JPH0253040A JP20522488A JP20522488A JPH0253040A JP H0253040 A JPH0253040 A JP H0253040A JP 20522488 A JP20522488 A JP 20522488A JP 20522488 A JP20522488 A JP 20522488A JP H0253040 A JPH0253040 A JP H0253040A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
led
lcd
environment
illumination
turns
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.)
Granted
Application number
JP20522488A
Other versions
JP2761733B2 (en )
Inventor
Masahiro Kawasaki
Original Assignee
Asahi Optical Co Ltd
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

Links

Abstract

PURPOSE: To realize pertinent illumination by deciding the brightness of light made incident on a liquid crystal display (LCD) and controlling the illumination.
CONSTITUTION: A LED (light emitting diode) 20, i.e., a illuminating means is provided on the one edge surface of the light guid plate 13; a phototransister 21, i.e., the light receiving means of a photometry means is provided on a position which faces the surface provided with the LED 20 and which does not directly face the LED 20. When the environment of the LCD 10 become darker than a designated value, the LED 20 turns on, and changes in brightness in response to the ennvironmental darkness; the LED 20 is thus controlled so that the environmental brightness of the LCD 10 becomes constant. Besides, when the environment is in a range brighter than the designated value, the LED 20 never turns on: When the environment is in a range darker than the designated value, the LED 20 turns on at a largest current. Therefore, preferable and economical illumination is possible without troublesome operation of an operational switch.
COPYRIGHT: (C)1990,JPO&Japio
JP20522488A 1988-08-18 1988-08-18 The camera of lcd lighting device Expired - Lifetime JP2761733B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20522488A JP2761733B2 (en) 1988-08-18 1988-08-18 The camera of lcd lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20522488A JP2761733B2 (en) 1988-08-18 1988-08-18 The camera of lcd lighting device

Publications (2)

Publication Number Publication Date
JPH0253040A true true JPH0253040A (en) 1990-02-22
JP2761733B2 JP2761733B2 (en) 1998-06-04

Family

ID=16503468

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20522488A Expired - Lifetime JP2761733B2 (en) 1988-08-18 1988-08-18 The camera of lcd lighting device

Country Status (1)

Country Link
JP (1) JP2761733B2 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04137335U (en) * 1991-06-13 1992-12-21
JPH0676931U (en) * 1993-03-31 1994-10-28 富士通テン株式会社 Lighting structure of the liquid crystal display
EP0725300A2 (en) 1995-01-31 1996-08-07 Minolta Co., Ltd. A display device with a display member illuminator, an appliance provided with a display device
US7002547B2 (en) 2002-01-23 2006-02-21 Seiko Epson Corporation Backlight control device for liquid crystal display
EP1818715A1 (en) * 2005-02-28 2007-08-15 Research In Motion Limited Method and apparatus for controlling the backlight intensity of a liquid crystal display (LCD) using detected intensity of ambient light
US7760975B2 (en) 2005-07-25 2010-07-20 Research In Motion Limited Shared light pipe for message indicator and light sensor
US7762819B2 (en) 2005-07-11 2010-07-27 Panasonic Corporation Substrate connecting member and connecting structure
JP2011505587A (en) * 2007-11-16 2011-02-24 クォルコム・メムズ・テクノロジーズ・インコーポレーテッド Thin planar sonar concentrator / collector and a diffuser used with the active display
US8279158B2 (en) 2005-02-28 2012-10-02 Research In Motion Limited Dual-function light guide for LCD backlight

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6199138U (en) * 1985-11-21 1986-06-25
JPS6321923U (en) * 1986-07-25 1988-02-13
JPS6373723U (en) * 1986-10-30 1988-05-17
JPS63237697A (en) * 1987-03-26 1988-10-04 Tokyo Electric Power Co Inc:The Information communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6199138U (en) * 1985-11-21 1986-06-25
JPS6321923U (en) * 1986-07-25 1988-02-13
JPS6373723U (en) * 1986-10-30 1988-05-17
JPS63237697A (en) * 1987-03-26 1988-10-04 Tokyo Electric Power Co Inc:The Information communication system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04137335U (en) * 1991-06-13 1992-12-21
JPH0676931U (en) * 1993-03-31 1994-10-28 富士通テン株式会社 Lighting structure of the liquid crystal display
EP0725300A2 (en) 1995-01-31 1996-08-07 Minolta Co., Ltd. A display device with a display member illuminator, an appliance provided with a display device
US6285420B1 (en) 1995-01-31 2001-09-04 Minolta Co., Ltd. Edge illuminated display device with light guiding member
US7002547B2 (en) 2002-01-23 2006-02-21 Seiko Epson Corporation Backlight control device for liquid crystal display
EP1818715A1 (en) * 2005-02-28 2007-08-15 Research In Motion Limited Method and apparatus for controlling the backlight intensity of a liquid crystal display (LCD) using detected intensity of ambient light
US8279158B2 (en) 2005-02-28 2012-10-02 Research In Motion Limited Dual-function light guide for LCD backlight
US8289271B2 (en) 2005-02-28 2012-10-16 Research In Motion Limited Dual-function light guide for LCD backlight
US7762819B2 (en) 2005-07-11 2010-07-27 Panasonic Corporation Substrate connecting member and connecting structure
US7760975B2 (en) 2005-07-25 2010-07-20 Research In Motion Limited Shared light pipe for message indicator and light sensor
JP2011505587A (en) * 2007-11-16 2011-02-24 クォルコム・メムズ・テクノロジーズ・インコーポレーテッド Thin planar sonar concentrator / collector and a diffuser used with the active display

Also Published As

Publication number Publication date Type
JP2761733B2 (en) 1998-06-04 grant

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