Patent ID: 7071954

Claim:
A display device comprising: a first input terminal for receiving an analog image signal; a second input terminal for receiving a digital image signal; an analog-to-digital converter connected to said first input terminal; a first switch for selecting an output between a digital signal outputted from said analog-to-digital converter and a digital signal inputted to said second input terminal; and a gradation circuit for converting a digital signal outputted from said first switch into a signal indicative of a level of pseudo gradation, said gradation circuit comprising: an error diffusion circuit for converting said digital signal outputted from said first switch into a signal indicative of a level of pseudo gradation by an error diffusion method; a dither pattern circuit for converting said digital signal outputted from said first switch into a signal indicative of a level of pseudo gradation by a dithering method; and a second switch for converting for output between an output signal of said error diffusion circuit and an output signal of said dither pattern circuit.