Patent ID: 8059109

Claim:
A display device including a matrix arrangement of a plurality of pixels, comprising: a source driver; a gate driver; a video signal generating circuit comprising a level converter circuit; and a pixel portion, wherein the display device displays at least one of a first image in accordance with a first display mode and a second image in accordance with a second display mode in the pixel portion, wherein the first display mode and the second display mode are switched in accordance with an intensity of outside light in such a manner that an analog signal is supplied to the source driver in the first display mode, while a digital signal is supplied to the source driver in the second display mode, wherein the video signal generating circuit is configured to supply the analog signal to the source driver by inputting a video signal to a D/A converter in the first display mode, wherein the video signal generating circuit is configured to supply the digital signal by supplying only a most significant bit of the video signal to the level converter circuit, and wherein the level converter circuit increases a potential level of the digital signal so as to correspond with a potential level of the analog signal.