| 摘要 |
PROBLEM TO BE SOLVED: To improve the image quality of a liquid crystal display panel driven by using a plurality of source driver ICs. SOLUTION: The gradation voltage generating circuit is a gradation voltage generating circuit 4A, disposed at each of a plurality of source drives ICs 10A for driving a plurality of pixels P. The gradation voltage generating circuit 4A includes a gradation resistor group, having a plurality of resistors R connected in series through a node N and a voltage follower 43, having an output terminal connected to one end of the gradation resistor group and supplying a reference supply voltage to the gradation resistor group. The node and one terminal of the gradation resistor group supply gradation voltages V<SB>g1</SB>to V<SB>gn</SB>, based on the reference supply voltage to a D/A converter 3. A non-inverting input terminal 44-1 of the voltage follower 43-1 and a non-inverting input terminal 44-2 of another voltage follower 43-2 are connected, in common to an external constant-voltage source 400A. The node N-1 is connected to the node N-2 in another gradation resistor group. COPYRIGHT: (C)2008,JPO&INPIT
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