| 摘要 |
A display data memory which is provided in a segment driver for driving a liquid crystal display panel comprises a plurality of memories. Since the common Y address is provided to all the memories, one predetermined memory is selected when a predetermined X address is decoded. At the time of writing data, a predetermined area in one memory is addressed according to X and Y addresses, and then data is written in the predetermined area. In case data is read out to be displayed, the memories are prohibited from being selected according to outputs from decoders. Data addressed by the common Y address are read out from the memories. Therefore, display data of one line are output as segment signals at a time.
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