Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2005-06-29
2009-08-18
Lefkowitz, Sumati (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
Reexamination Certificate
active
07576731
ABSTRACT:
An information processing apparatus has a resistance film type touch panel generating position coordinate data at a predetermined sampling interval, a liquid crystal display panel driven by a liquid crystal drive voltage, a first control circuit having a first generating circuit generating a horizontal synchronizing signal, a second generating circuit generating an alternating current signal for reversing the polarity of the liquid crystal drive voltage based on the horizontal synchronizing signal, and a third generating circuit generating a noise warning signal based on the horizontal synchronizing signal, the noise warning signal telling the interval at which the polarity of the liquid crystal drive voltage reverses; and a second control circuit changing the predetermined sampling interval based on the noise warning signal and detecting a position coordinate input from the resistance film type touch panel at the changed predetermined sampling interval.
REFERENCES:
patent: 6229528 (2001-05-01), Okajima et al.
patent: 6236386 (2001-05-01), Watanabe
patent: 10-040016 (1998-02-01), None
patent: 11-352462 (1999-12-01), None
Carter III Robert E
Lefkowitz Sumati
Oki Semiconductor Co., Ltd.
Volentine & Whitt P.L.L.C.
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