Texas Instruments Corporation

Texas Instruments Incorporated Deutschland, Gmbh

Frank Haupt

David Baum

Jerry Doorenbos

Gamma curve correction circuitry includes first (-) and second (-) groups of gamma correction buffers and corresponding DACs (-). Each buffer has an input coupled to an output of a corresponding DAC, respectively, and an output coupled by a corresponding output conductor, respectively, to a corresponding resistor string tap point. A midrange voltage (V) is produced with a value approximately midway between a first voltage (V) and a second voltage (GND) and is coupled to provide power to the first and second groups of buffers. The first voltage is coupled to a first voltage terminal of a first buffer (-) of the first group. A second voltage terminal of the first buffer is coupled to the midrange voltage. The midrange voltage is coupled to a first voltage terminal of a first buffer (-) of the second group. A second voltage terminal of the first buffer of the second group is coupled to the second voltage.

Circuitry and method for reducing power consumption in gamma correction circuitry

A gamma reference voltage generator (B) for an LCD display includes a control interface logic circuit () having an output bus coupled to inputs of a first register () having outputs coupled to inputs of a second register () the outputs of which are coupled to corresponding inputs of plurality of DACs (). The control interface logic circuit receives gray scale codes representative of gamma reference voltages and transfers the codes via the output bus into the first register and controls further transfer of the codes to inputs of the DACs to instantaneously or rapidly update gamma correction voltages applied to the LCD display.

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Nuertingen, Germany

Frank Haupt