Patent ID: 8358294

Claim:
An active-matrix display device for providing a gradation display of video to be displayed, comprising: a display portion including a plurality of scanning signal lines, a plurality of video signal lines crossing the scanning signal lines, and a plurality of display elements arranged in a matrix in accordance with intersections between the scanning signal lines and the video signal lines; a scanning signal line drive circuit for selectively activating the scanning signal lines; a first reference voltage generation circuit for generating first gradation reference voltages immediately after the display device is powered on, the first gradation reference voltages each having a fixed voltage value; a second reference voltage generation circuit for generating second gradation reference voltages each having a variable voltage value; a changeover circuit for, after the generation of the second gradation reference voltages, changing over the first gradation reference voltages inputted from the first reference voltage generation circuit to the second gradation reference voltages inputted from the second reference voltage generation circuit, and outputting the second gradation reference voltages; and a video signal line drive circuit for generating gradation voltages based on either the first or second gradation reference voltages outputted from the changeover circuit, generating an analog video signal by selecting any one of the gradation voltages based on an externally supplied digital video signal, and thereafter outputting the analog video signal to the video signal lines.