Patent ID: 6380917
Filing Date: 2002-04-30
Classification: G09G

Abstract:
A driving circuit of an electro-optical device that supplies an analog image signal, which has a driving voltage corresponding to an arbitrary gray scale level among 2N (where N is a natural number) steps of gray scale, to a signal line of an electro-optical device in which changes in an optical characteristic thereof with respect to changes in said driving voltage are nonlinear; said driving circuit of an electro-optical device comprising:an input interface to which an N-bit digital image signal indicative of said arbitrary gray scale level is applied; and a digital-to-analog converter that generates a driving voltage within a first driving voltage range defined by a first pair of reference voltages or within a second driving voltage range defined by a second pair of reference voltages according to a bit value of said digital image signal and corresponding to the gray scale level of said digital image signal so that changes in said driving voltage with respect to changes in the gray scale level of said digital image signal are nonlinear; the digital-to-analog converter generates a voltage within the range of the first pair of reference voltages if said applied digital image signal indicates a gray scale level from a first to mâˆ’1th value (where â€œmâ€  is a natural number and 1 N), and generates a voltage within the range of the second pair of reference voltages adjacent to said first driving voltage range if said digital image signal indicates a gray scale level from an m-th to 2N-th value, and supplies said analog image signal including said generated driving voltage to said signal line.