Low power liquid-crystal display driver

Details Low power liquid-crystal display driver Low power liquid-crystal display driver

1997-09-24

1999-09-14

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

H03M 166

Patent

active

059529482

ABSTRACT:
A low power digital to analog converter (DAC) circuit is presented that is particularly suited for liquid-crystal display driver systems. The DAC according to one embodiment of the present invention uses a dedicated resistive divider chain that is selectively switched between adjacent pairs of coarse analog reference signals to generate finer analog reference signals. In a preferred embodiment, the resistance of the switches are used in combination with the resistive divider chain to form a voltage divider. In the preferred embodiment, the DAC of the present invention uses MOS transistors to implement the switches and the resistive elements in the divider chain.

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patent: 5065159 (1991-11-01), Kuwana
patent: 5079552 (1992-01-01), Pelgrom et al.
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patent: 5252975 (1993-10-01), Yuasa et al.
patent: 5386438 (1995-01-01), England
"A 25MHz 162-Output S/H Analog Column Driver for LCDs," Lelah et al., Digest of Technical Papers, IEEE International Solid-State Circut Conference, 1992.
"A 30-V Row/Column Driver for Flat-Panel Liquid Crystal Displays," Muhlemann, Jul. 29, 1987, rev. Nov. 11, 1987, IEEE Journal of Solid State Circuits, vol. 23, No. 2, Apr. 1988.

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