| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to automatically adjust a level and amplitude of a liquid crystal driving signal with accuracy in the set state after having packaged a liquid crystal driving device on a substrate. SOLUTION: In a video signal output part 20, an input video signal Si is inversion-processed by an inversion processing part 21, and the inversion- processed video signal is clamped so that the non-inverted side black level and the inverted side black level are set symmetrical to a reference voltage Vref from a reference voltage generation part 10, to obtain an output video signal So. In a detection part 40, controller 50, and a DAC 60 for adjustment, a non-inverted side black level of the output video signal So is detected on the basis of the reference voltage Vref from the reference voltage generation part 10, and a current value of a current source 27 of the clamp part 23 is adjusted according to the detection result, and the level and amplitude of the output video signal So are adjusted. COPYRIGHT: (C)2003,JPO
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