DISPLAY SCREEN DRIVE CIRCUIT FOR CONTROLLING MIXED SUPERPOSITION GREY LEVEL

摘要

A display screen drive circuit for controlling mixed superposition grey level is provided. The circuit includes a grey level control device. The grey level control device includes a mixed superposition adder which divides N-bit grey level data (G) into high M bits and low (N-M) bits and obtains scanning data(). The high M bits are used as a superposition reference value(), and the low (N-M) bits are used as a superposition increment value (). The scanning data() used in a plurality of scanning processes can be obtained by superposing the reference value()and superposition amount(). The grey level control device also includes an apparatus for setting an overflow bit (F) and an apparatus for outputting the scanning data ().