Patent ID: 8638317

Claim:
A display apparatus, comprising: a transmissive type liquid crystal display panel having a display function and a light- receiving/imaging function, the display panel including a display area including a plurality of pixels arranged in a matrix, each pixel including a light-emitting element and a light-receiving sensor; a first image processing section configured to: (a) receive at least two images from the light-receiving/imaging function including an image taken while a self-illuminating section is turned on and light is transmitted through the light-emitting element and an image taken while the self-illuminating section is turned off; (b) perform image processing on the at least two images including combining the at least two images, the image processing performed by the first image processing section resulting in at least a first processed image; (c) perform a smoothing process on the first processed image for noise reduction: (d) determine, based at least in part on the first processed image, whether a to-be- detected object has been detected; (e) generate a detected signal that indicates whether the to-be-detected object has been detected; and (f) send the generated detection signal to a control section; a second image processing section configured to: (a) receive the first processed image; and (b) perform image processing on the first processed image, the image processing performed by the second image processing section having a heavier processing load than the image processing performed by the first image processing section; and a control section configured to control an operation of the second image processing section in accordance with the generated detection signal such that when the control section determines that the image processing performed by said second image processing section is not necessary, the control section causes the second image processing section to enter a sleep state, wherein the control section suspends a supply of power to the second image processing section during the sleep state, wherein when said second image processing section is in the sleep state, said control section causes the light-receiving/imaging function and the image processing performed by said first image processing section to be repeatedly performed at a first frequency greater than zero, and wherein when said second image processing section is not in the sleep state, said control section causes the light-receiving/imaging function and the image processing performed by said first image processing section to be repeatedly performed at a second frequency that is greater than the first frequency.