Computer graphics processing and selective visual display system – Display driving control circuitry
Patent
1998-01-29
1999-12-28
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Display driving control circuitry
345100, 345 98, 345209, G09G 500
Patent
active
06008801&
ABSTRACT:
A TFT-LCD source driver for driving a TFT-LCD pixel array includes a first latch for latching a plurality of digital video signals, the first latch simultaneously outputting the entire latched digital video signals, and a second latch processing the digital video signals outputted from the first latch to generate inverted digital video signals, the second latch further outputting noninverted digital video signals corresponding to the video signal outputted from the first latch. The TFT-LCD source driver further includes a first multiplexor for receiving the noninverted digital video signals and the inverted digital video signals from the second latch, the first multiplexor selectively outputting one of the noninverted digital video signals and the inverted digital video signals as output signals from the first multiplexor in accordance with a polarity control signal, a second multiplexor for receiving the noninverted video signals outputted from the second latch and the output signals from the first multiplexor, the second multiplexor selectively outputting one of the noninverted video signals outputted from the second latch and the output signals from the first multiplexor as output signals from the second multiplexor in accordance with an inversion control signal, a digital-analog converter for converting the output signals from the second multiplexor to analog video signals, and an output buffer processing the analog video signals from the digital-analog converter to output signals for driving the LCD pixel array, the output buffer outputting one of driving signals that corresponds to the analog video signals from the digital-analog converter and driving signals that correspond to the sum of the analog video signals and a predetermined DC voltage in accordance with the polarity control signal and the inversion control signal.
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patent: 5412397 (1995-05-01), Kanatani et al.
patent: 5598178 (1997-01-01), Kawamori
patent: 5724061 (1998-03-01), Kanbara
patent: 5739805 (1998-04-01), Dingwall
patent: 5784040 (1998-07-01), Kobayashi et al.
K. Meinstein et al., "A Low-Voltage Source Driver for Column Inversion Applications", SID 96 Digest, pp. 255-258, 1996.
Hjerpe Richard A.
LG Semicon Co. Ltd.
Nguyen Kimnhung
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