Patent ID: 7545350

Claim:
An active-matrix organic electroluminescent display device comprising: scanning lines; signal lines; and pixels formed in a matrix, each pixel being at an intersection of each of the scanning lines and each of the signal lines, wherein each pixel includes a light-emitting element comprising an organic electroluminescent element, a light-emitting circuit comprising a thin-film transistor, and a light-receiving circuit comprising a thin-film transistor, when the light-emitting circuit is selected by the scanning line, the light-emitting circuit drives the light-emitting element according to a video signal that is input from the signal line, thereby displaying an image on the pixels formed in the matrix, and the light-receiving circuit is selected in a period of time during which the light-emitting circuit does not operate, and outputs a light-receiving signal in accordance with the amount of light incident on the pixel to a different signal line, wherein the light-receiving circuit includes a resetting unit that resets the light-emitting element to a reverse-bias state, and an amplification unit that amplifies a photo-leakage current that flows in the light-emitting element according to the amount of light incident on the reverse-biased light-emitting element to generate a light-receiving signal, wherein the light-receiving circuit includes: an input switch that supplies the photo-leakage current flowing in the light-emitting element according to the amount of incident light to the amplification unit; and an output switch that reads a light-receiving signal from the amplification unit to the signal line, the light-receiving signal being obtained by amplifying the supplied photo-leakage current and the input switch and the output switch are independently turned on and off.