Patent ID: 7348946

Claim:
A digital image display system, comprising: a plurality of Light Emitting Diodes (LEDs) forming a display panel for displaying a digital image, at least some of the LEDs of the display panel capable of sensing light when in a sense mode and emitting light to create a portion of the digital image when in an emit mode; a driving circuit to drive at least some of the LEDs; a sensing circuit to sense light rcceived at some of the LEDs; a switch coupled with the driving circuit, sensing circuit and some of the LEDs, to switch some of the LEDs from the sense mode to the emit mode; and a feedback controller coupled with the sensing and driving circuits, the feedback controller to adjust the brightness of an LED in response to the amount of light sensed by that LED; wherein: the sensing circuit is coupled to a first LED; the sensing circuit comprises: a reverse biasing circuit coupled to a first terminal of the first LED; and a sensing circuit coupled to a second terminal of the first LED; the driving circuit is coupled to the first LED; and the driving circuit comprises a forward driving circuit coupled to the second terminal of the first LED.