Patent ID: 8125474
Filing Date: 2012-02-28
Classification: G09G

Abstract:
1. A display device comprising: a substrate; a display area provided on the substrate and includes a switching element in correspondence with each pixel; a photodetection unit having first and second photosensors; a photosensor reader unit; a light amount detecting device that outputs the amount of light detected by the photodetection unit as a light amount signal; a first photodetection circuit that outputs a first output signal based on incident light that enters the first photosensor to the photosensor reader unit; and a second photodetection circuit that outputs a second output signal to the photosensor reader unit based on dimmed incident light, which is dimmed through a light dimming unit as compared with the light that enters the first photosensor and which enters the second photosensor, wherein the photosensor reader unit includes a photodegradation coefficient calculation unit that calculates a first measurement ratio, which is a ratio of the first output signal to the second output signal, and then calculates a photodegradation power correction coefficient, which is a ratio of the first measurement ratio to an initial ratio that is an initial first measurement ratio measured beforehand; a photodegradation rate calculation unit that derives modified power coefficients on the basis of the photodegradation power correction coefficient, calculates a second measurement ratio, which is a ratio of the power-corrected first and second output signals, using the modified power coefficients, and then calculates a photodegradation slope correction coefficient, which is a ratio of the second measurement ratio to the initial ratio; and an optical signal output unit that derives modified proportional coefficients on the basis of the photodegradation slope correction coefficient, corrects the power-corrected first and second output signals using the modified proportional coefficients so as to be initial light amount signals and then outputs the initial light amount signals.