Output buffer of a source driver in a liquid crystal display...

Details Output buffer of a source driver in a liquid crystal display... Output buffer of a source driver in a liquid crystal display...

2010-11-17

2011-12-20

Awad, Amr (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C330S292000, C330S257000, C330S260000, C345S099000

Reexamination Certificate

active

08081150

ABSTRACT:
Provided is an output buffer for a source driver of an LCD with a high slew rate, and a method of controlling the output buffer. The output buffer, which outputs a source line driving signal for driving a source line of the LCD, includes: an amplifier section amplifying an analog image signal; an output section outputting the source line driving signal in response to a signal amplified by the amplifier section; and a slew rate controller section, setting a capacitance of a capacitor section to a first capacitance, during a first charge sharing period in which the source line is precharged to a first precharge voltage, setting the capacitance of the capacitor section to a second capacitance smaller than the first capacitance during a second charge sharing period in which the source line driving signal is supplied to the source line, and setting the capacitance of the capacitor section to the first capacitance while the source line driving signal is maintained after the second charge sharing period.

REFERENCES:
patent: 5457421 (1995-10-01), Tanabe
patent: 5917378 (1999-06-01), Juang
patent: 6496175 (2002-12-01), Fukuo
patent: 7652538 (2010-01-01), Choi
patent: 2005/0093629 (2005-05-01), Nishimura et al.
patent: 2006/0091955 (2006-05-01), Choi

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