Patent ID: 8797275

Claim:
A display apparatus performing display of an image and light reception simultaneously or alternately, comprising: a light source emitting a backlight to a display surface; a panel unit having a plurality of pixels, each pixel including a light emission cell emitting light to display an image on the display surface and a light reception cell receiving light which is emitted from the light source, is reflected by an object to be detected coming into contact with or approaching the display surface, and enters from the display surface side; and a position detector for specifying the position of the object to be detected, the position detector comprising: a peak detector generating a binary image by performing a binarizing process on an HPF (High Pass Filter) image generated by passing the captured image, which is captured from the plurality of light reception cells, through an HPF, extracting an image of a predetermined region from the captured image or the HPF image using the binary image as a mask, detecting the peak value from pixel data of the extracted image, and detecting position of a peak pixel having the peak value, a determining unit calculating a pixel data difference by subtracting, from the pixel data of the peak pixel, an average value of pixel data of the predetermined peripheral pixels around the peak pixel, comparing the pixel data difference with a first threshold, determining that the object to be detected is in contact with the display surface when the pixel data difference is larger than a first threshold, and determining that the object to be detected is not in contact with the display surface when the pixel data difference is equal to or less than the first threshold, and a position deriving unit deriving position on the display surface, of the object to be detected which is in contact with the display surface using a detection result and a determination result in the determining unit.