Patent ID: 6900784

Claim:
A display apparatus comprising: a display panel constituted by luminescent pixel units arranged in a matrix pattern, each of said luminescent pixel units including a first transistor for generating a drive current based on a video signal and a luminescent device that emits light at a luminance based on the drive current; a monitoring luminescent device provided additionally to said luminescent devices of said luminescent pixel units; a reference current source, connected in series with said monitoring luminescent devices, generating a reference drive current that causes the monitoring luminescent device to emit light at a luminance of K % of a maximum luminance level; a second transistor, connected in series with said monitoring luminescent device, for supplying the reference drive current to the monitoring luminescent device; a switch having a closed state for connecting a reference drive current output end of the second transistor and a control end of the second transistor; and a video signal corrector, responsive to a voltage at said control end of the second transistor when said switch is at said closed state, for correcting the video signal so that a voltage value on a control end of said first transistor is equal to the voltage value on the control end of the second transistor when a luminance indicated by the video signal is K % of the maximum luminance level.