Patent ID: 7030869
Filing Date: 2006-04-18
Classification: G09G

Abstract:
1. A signal drive circuit which drives signal lines of an electro-optical device having pixels specified by a plurality of scan lines and a plurality of signal lines which intersect each other, based on image data, the signal drive circuit comprising: a line latch which latches the image data in a horizontal scanning cycle; a drive voltage generation circuit which generates a drive voltage for each signal line based on the image data latched in the line latch; a partial display data holding circuit which holds partial display data indicating permission for or prohibition against output to the signal lines on the basis of image data in units of blocks; and a signal line drive circuit which drives each signal line based on the drive voltage generated by the drive voltage generation circuit, wherein the signal line drive circuit determines whether to perform high impedance control for an output of the signal line drive circuit in units of blocks, each block including a given plural number of the signal lines, wherein an output of the drive voltage for the signal lines is controlled in units of blocks, in one or more blocks in which no high impedance control is performed for the output of the signal line drive circuit, and wherein an output of the drive voltage for the signal lines is controlled in units of blocks based on the partial display data by the signal line drive circuit in one or more blocks in which no high impedance control is performed for an output of the signal line drive circuit.