Importance

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Abstract

There is provided a color LCD (Liquid Crystal Display) interface circuit for outputting an RGB (Red, Green, Blue) signal for an intended image and a synchronization signal for either a horizontal and vertical synchronization or a composite synchronization to a color LCD controller in a portable radio terminal which has a color LCD and a controller and supports a character-type black and white LCD. In the color LCD interface circuit, a first memory stores data needed to execute a color LCD interface program and to represent fonts and color, a main controller reads the color LCD interface program from the first memory and executes the color LCD interface program, a second memory stores a page of image information generated during executing the color LCD interface program, a multiplexer selects one of input signals according to whether a graphical display on the color LCD is a picture or represents the operational status of the portable radio terminal, and a color processor receives various commands and index data from the controller and generates an internal composite synchronization signal and a digital RGB signal.

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First Claim