Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2005-11-08
2005-11-08
Chang, Kent (Department: 2675)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C349S061000
Reexamination Certificate
active
06963329
ABSTRACT:
A portable computer system comprises a main body and an LCD apparatus having an LCD panel and a back light for illuminating the LCD panel. The system further comprises: a DC/AC inverter for supplying AC power to the back light; a contrast sensing part for sensing contrast of a video signal displayed on the LCD panel; a DC converter for converting a PWM signal outputted from the contrast sensing part into a DC signal; a voltage controller causing the DC signal from the DC converter to be appropriate for an operating voltage of the DC/AC inverter so as to supply the operating voltage to the DC/AC inverter; and a controller for sensing the operating voltage of the DC/AC inverter, and for controlling the voltage controller on the basis of the operating voltage. With this configuration, the brightness of a back light can be automatically controlled according to a contrast sensed by a contrast sensing part regardless of the input impedance of the inverter.
REFERENCES:
patent: 4760389 (1988-07-01), Aoki et al.
patent: 5153756 (1992-10-01), Ike
patent: 5157525 (1992-10-01), Eaton et al.
patent: 5162785 (1992-11-01), Fagard
patent: 5315695 (1994-05-01), Saito et al.
patent: 5751118 (1998-05-01), Mortimer
patent: 5786801 (1998-07-01), Ichise
patent: 5818172 (1998-10-01), Lee
patent: 5818553 (1998-10-01), Koenck et al.
patent: 5828351 (1998-10-01), Wu
patent: 5854617 (1998-12-01), Lee et al.
patent: 5952992 (1999-09-01), Helms
patent: 6069449 (2000-05-01), Murakami
patent: 6297861 (2001-10-01), Jo
patent: 2001/0008395 (2001-07-01), Yamamoto et al.
patent: 5-165424 (1993-07-01), None
patent: 5-276656 (1993-10-01), None
patent: 6-34946 (1994-02-01), None
patent: 06034946 (1994-02-01), None
patent: 7-120719 (1995-05-01), None
patent: 7-211476 (1995-08-01), None
patent: 07211476 (1995-08-01), None
patent: 8-213182 (1996-08-01), None
patent: 9-80377 (1997-03-01), None
patent: 9-230304 (1997-09-01), None
patent: 10-148808 (1998-06-01), None
patent: 11-97196 (1999-04-01), None
patent: 1998-26702 (1998-08-01), None
patent: 1999-84477 (1999-12-01), None
Bushnell , Esq. Robert E.
Chang Kent
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