Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2006-10-24
2006-10-24
Tran, Henry N. (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S089000, C345S208000
Reexamination Certificate
active
07126596
ABSTRACT:
A rail-to-rail amplifier suitable for use in a line-inversion LCD grayscale reference generator comprises a p-type differential pair and a first switchable current source which supplies tail current to the p-type pair in response to a first control signal, and an n-type pair and a second switchable current source which supplies tail current to the n-type pair in response to a second control signal; when its tail current is present, each pair provides a differential output current which varies with a differential input signal. A control circuit provides the control signals such that the first switchable current source is enabled when a voltage applied to the amplifier's input is closer to the amplifier's negative supply rail, and the second switchable current source is enabled when the applied voltage is closer to the amplifier's positive supply rail, such that only one input pair is active at any given time.
REFERENCES:
patent: 6225992 (2001-05-01), Hsu et al.
patent: 6677923 (2004-01-01), Kajihara et al.
patent: 6750839 (2004-06-01), Hogan
patent: 6762737 (2004-07-01), Kajihara et al.
patent: 6909414 (2005-06-01), Tsuchi et al.
patent: 6963325 (2005-11-01), Yano et al.
Analog Devices, Integrated LCD Grayscale Generator, ADD8502, 2002, pp. 1-16.
Analog Devices Inc.
Koppel Patrick & Heybl
Tran Henry N.
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