Reference voltage generators for use in display applications

Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion

Reexamination Certificate

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Details

C341S122000, C341S141000, C341S145000, C345S087000, C345S089000, C345S098000, C345S099000, C345S100000

Reexamination Certificate

active

07385544

ABSTRACT:
A multi-reference voltage generator includes an interface controller, a first bank of N m-bit registers and a second bank of N m-bit registers. A first multiplexer has inputs connected to outputs of the first and second bank of registers. An m-bit digital-to-analog (DAC) has an m-bit parallel input connected to an output of the first multiplexer. An analog demultiplexer has an input connected to an analog output of the m-bit DAC. Each sample-and-hold circuit in a first group of N sample-and-hold (S/H) circuits is connected to a corresponding output of the analog demultiplexer. Similarly, each S/H circuit in a second group of N S/H circuits is connected to a corresponding output of the analog demultiplexer. N further multiplexers each have a first input connected to an output of a corresponding one of the S/H circuits in the first group and a second input connected to an output of a corresponding one of the S/H circuits in the second group. N output buffers, each have an input connected to an output of a corresponding one of the N further multiplexers, and an output useful for driving a column driver.

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