Patent ID: 8154535

Claim:
A display apparatus comprising: a panel part having a plurality of light emission cells which display an image on a display surface and emit detection light, and a plurality of light reception cells which receive a portion of the detection light incident from a side of the display surface; a storage unit storing initial data and detection data; an image generating unit generating an image on the basis of a first light reception image and a second light reception image, the first light reception image being obtained from the plurality of light reception cells in a first period in which the detection light is emitted from the display surface, and the second light reception image being obtained from the plurality of light reception cells in a second period in which the detection light is not emitted from the display surface; an image determining unit determining whether or not an image of a detected object is included in the image, storing data corresponding to the image as the initial data into the storage unit when it is determined that there is no detected object included in the image, and storing data corresponding to the image as the detection data into the storage unit when it is determined that a detected object is included in the image; and a position determining unit determining at least a position of the detected object on the basis of an image represented by the detection data stored in the storage unit and an image represented by the initial data, wherein the image generating unit generates a first reversed image and a moving-averaged image from the second light reception image, generates a second reversed image and a predetermined threshold from the moving-averaged image, generates a difference image from a difference between the first reversed image and the second reversed image, and generates an image for determination by subtracting the threshold from each pixel data of the difference image.