| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost of a driving circuit of LCD(liquid crystal display). SOLUTION: The circuit has a reference voltage controlling circuit which has a reference voltage data preparing circuit 12, that prepares reference voltage data PD from bright data BD, and a selector 11 that switches and selects reference voltage data CD and digital R, G and B data in accordance with a timing control signal Tc. By varying the reference voltage level in accordance with a bright level, the direct current component of the voltage signal, which is obtained by clamping the reference voltage level, is controlled.
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