Patent ID: 7688298

Claim:
A display device displaying a gray level based on display data constituted of weighted n bits where n is an integer of at least two, comprising: a plurality of pixel circuits each indicating a brightness according to a supplied voltage; a selection line for selecting said plurality of pixel circuits; a data line connected to said plurality of pixel circuits; and a gray-level voltage generation circuit for supplying to said data line a gray-level voltage that is an analog voltage according to said display data, said gray-level voltage generation circuit including a pulse number control circuit supplying, to a first node, pulses of a number according to said display data, said pulses including a first transition edge changing from an initial level to a predetermined level and a second transition edge returning from said predetermined level to said initial level and a charge pump circuit changing, in a stepwise manner, each time one of said pulses is supplied to said first node, a voltage on an output node connected to said data line.