Patent ID: 6885385

Claim:
An image display apparatus for multiple tone display with number of gradation levels determined by number of bits of an image signal of m bit digital data, comprising: a display having data holding function for holding data in pixels arranged on a matrix and performing display according to held data; a vertical drive circuit sequentially and selectively scanning matrix form display elements forming said display per row; a horizontal drive circuit writing a voltage among binary voltage preliminarily assigned depending upon the digital data of the image signal to be displayed in the display elements in the row selected by the vertical drive circuit, said horizontal drive circuit and said vertical drive circuit being operated for performing selective scan of respective display element for at least m times in one frame period in synchronism with said image signal to be displayed, and said vertical drive circuit being constituted of n in number of sequence circuits and logic operation circuits for outputs of said sequence circuits, which n is smaller than m, a period from inputting to said sequence circuit to outputting from the final stage being less than or equal to half of one frame period, and at least one of said sequence circuits being used with selectively inputting a plurality of inputs.