Patent ID: 8570302

Claim:
A display device having a substrate on which pixels are disposed in the form of a matrix on an effective screen, and an image signal applied to each of the pixels is controlled by a thin-film transistor corresponding to the respective pixels, wherein a photosensor formed using a thin-film transistor is disposed on the substrate on an outside of the effective screen, the photosensor generates a signal as a result of outside light being blocked, and the signal from the photosensor causes the display device to perform a specified function; a correction sensor formed using a thin-film transistor is formed in the vicinity of the photosensor, and a light-blocking film is formed over the thin-film transistor of the photosensor for blocking the outside light, wherein an opening part in the light-blocking film is defined only over a drain region of the thin-film transistor of the photosensor such that a photo-electric current is generated in the drain region of the thin-film transistor of the photosensor, and a light-blocking layer is formed over the thin-film transistor of the correction sensor for blocking the outside light.