Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2006-09-12
2006-09-12
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S087000
Reexamination Certificate
active
07106294
ABSTRACT:
A doubler part doubles frequencies of video signals. A drive control circuit generates, in response to a synchronizing signal outputted from the doubler part, PWM dimming frequency information such that a PWM dimming frequency f and a black display ratio B satisfy the relationships f≧25B+250 and B>10, and provides such information to a PWM dimming signal generation circuit. In addition, the drive control circuit drives a gate driver and a source driver such that one frame period is divided into an image display period and a black display period. The PWM dimming signal generation circuit generates, in response to a synchronizing signal and the PWM dimming frequency information, a PWM dimming signal and provides the PWM dimming signal to a lighting circuit. The lighting circuit activates a backlight device with dimming, in response to the PWM dimming signal. This configuration reduces colored interference fringes in a liquid crystal display device resulting from the combination of a black insertion drive technique and a PWM dimming technique.
REFERENCES:
patent: 5844540 (1998-12-01), Terasaki
patent: 6693619 (2004-02-01), Miura et al.
patent: 6980225 (2005-12-01), Funamoto et al.
patent: 2002/0067332 (2002-06-01), Hirakata et al.
patent: 7-84254 (1995-03-01), None
patent: 9-96790 (1997-04-01), None
patent: 11-109921 (1999-04-01), None
patent: 2000-31790 (2000-01-01), None
patent: 2000-293142 (2000-10-01), None
patent: 2000-321551 (2000-11-01), None
patent: 2003-50569 (2003-02-01), None
Arimoto Katsuyuki
Funamoto Taro
Kumamoto Yasuhiro
Hjerpe Richard
Matsushita Electric Industrial Co. LTD
Said Mansour M.
Wenderoth , Lind & Ponack, L.L.P.
LandOfFree
Liquid crystal display device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid crystal display device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid crystal display device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3559012