| 摘要 |
PROBLEM TO BE SOLVED: To make correctable an unevenness of output by use of video amplifiers, by detecting a 1T difference outputted from an n-phase A/D converter, and by accumulatively adding up an absolute valve of the detected 1T difference. SOLUTION: After the gain and offset of an input analog image signal are adjusted in video amplifiers 2 and 3 controlled by a microcomputer 10 such that the analog image signal matches with dynamic ranges of A/D converters 4 and 5, the amplified analog image signals are inputted into the A/D converters 4 and 5 to be converted into digital signals. An inverter gate 1 adjusts a sampling clock CLK/2 (i.e., a half clock CLK/2 of an image signal clock CLK) such that the A/D converters 4 and 5 operate out-of-phase 180 degrees. A pixel conversion LSI 11 processes even and odd data outputted from the A/D converters 4 and 5 to display images on a liquid crystal panel module 12. An adder 7 adds the even data latched by a latch 6 to the odd data. An accumulative adder 8 accumulatively adds up the added data from the adder 7 in timing with the sampling clock CLK/2, and outputs the accumulatively added result to the microcomputer 10 as video amplifier control data.
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