Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2011-07-19
2011-07-19
Eisen, Alexander (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S087000, C345S088000, C345S204000
Reexamination Certificate
active
07982706
ABSTRACT:
The present invention prevents extension of the time period from powering on a device to convergence of chromaticity of emitted white light on a certain chromaticity, irrespective of the temperature when the device is powered on. A color liquid crystal display apparatus includes a liquid crystal display unit, a backlight employing LEDs of red, green and blue as its light source, a drive unit for driving the LEDs of each color, a temperature sensor for sensing the temperature of the LEDs, and a chromaticity sensor for sensing the chromaticity of white light emitted from the LEDs. The drive unit supplies a current to the LEDs to drive them, and implements feedback control of the amount of current for the LEDs of each color based on a value sensed by the chromaticity sensor so that the white light has a certain chromaticity. Furthermore, upon powering on the backlight, the drive unit retrieves initial current values of the LEDs of each color from a non-volatile memory, and corrects the initial current values according to a value sensed by the temperature sensor to activate the LEDs of each color with the corrected value.
REFERENCES:
patent: 6411046 (2002-06-01), Muthu
patent: 6441558 (2002-08-01), Muthu et al.
patent: 6621482 (2003-09-01), Fuller
patent: 6888529 (2005-05-01), Bruning et al.
patent: 7199771 (2007-04-01), Yamazaki et al.
patent: 7208713 (2007-04-01), Ishiguchi
patent: 7439941 (2008-10-01), Kumakura et al.
patent: 7511695 (2009-03-01), Furukawa et al.
patent: 7656371 (2010-02-01), Shimizu et al.
patent: 7888623 (2011-02-01), Kawashima et al.
patent: 2003/0011559 (2003-01-01), Adachi et al.
patent: 2003/0214242 (2003-11-01), Berg-johansen
patent: 2003/0230991 (2003-12-01), Muthu et al.
patent: 2006/0022616 (2006-02-01), Furukawa et al.
patent: 2006/0221047 (2006-10-01), Tanizoe et al.
patent: 1482770 (2004-12-01), None
patent: 10-049074 (1998-02-01), None
patent: 2001-257921 (2001-09-01), None
patent: 2001-272938 (2001-10-01), None
patent: 2002-189220 (2002-07-01), None
patent: 2002-258792 (2002-09-01), None
patent: 2004-193029 (2004-07-01), None
patent: WO 03075617 (2003-09-01), None
Hatajiri Kimio
Ichikawa Hiroaki
Kikuchi Kenichi
Eisen Alexander
Lerner David Littenberg Krumholz & Mentlik LLP
Mandeville Jason M
Sony Corporation
LandOfFree
Backlight device, method of driving backlight and liquid... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Backlight device, method of driving backlight and liquid..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Backlight device, method of driving backlight and liquid... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2637098