Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2005-05-02
2009-02-10
Nguyen, Kevin M (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S213000, C345S087000
Reexamination Certificate
active
07489295
ABSTRACT:
A liquid crystal display device is provided which is capable of preventing flicker or fringes in a display screen occurring even when changes in frequencies of a vertical sync signal and horizontal sync signal contained in a video signal input to the liquid crystal display device occur. A frequency detecting circuit sets a frequency of a driving pulse voltage at a value in the vicinity of “positive integer+½” times of the frequency of the horizontal sync signal and a pulse frequency for PWM (Pulse Width Modulation) light control at a value in the vicinity of a positive integral multiple or “positive integer+½” times of the vertical sync signal and a resonant frequency at a value in the vicinity of the frequency of the driving pulse voltage by adjusting capacitance value of a resonant capacitor.
REFERENCES:
patent: 5940061 (1999-08-01), Sato
patent: 7362303 (2008-04-01), Jang
patent: 2004/0051692 (2004-03-01), Hirakata et al.
patent: 5-113766 (1993-05-01), None
patent: 2002-8887 (2002-01-01), None
NEC LCD Technologies Ltd.
Nguyen Kevin M
Young & Thompson
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