Patent ID: 7098878
Filing Date: 2006-08-29
Classification: G09G

Abstract:
1. A liquid cristal driver device comprising: a plurality of drive circuits for driving pixels of a liquid crystal panel; a plurality of output pads corresponding to the drive circuits; a plurality of input pads used in test mode; a test pad disposed in line with the input pads; a plurality of output switches, one for each adjacent pair of nth and (n×1)th driver circuits, providing three operating states of: (a) connecting outputs of the nth and (n+1)th driver circuits straight to the nth and (n×1)th output pads, respectively, (b) cross-connecting the outputs of the nth and (n×1)th driver circuits to the (n×1)th and nth output pads, respectively, and (c) disconnecting the (n×1)th and nth output pads from the nth and (n×1)th driver circuits; interpad switches connecting every other output pad to the test pad in test mode; and a controller sequentially making connections via the output switches in the test mode, wherein the controller in the test mode causes the outputs of each adjacent pair of driver circuits to appear one by one at the test pad by setting the corresponding output switch to the operating state (a) or (b) while maintaining the other output switches in the operating state (c).