Patent ID: 8519912

Claim:
A liquid-crystal display apparatus comprising: a light source for generating visible-domain light and invisible-domain light; a plurality of liquid-crystal devices laid out in a display face region of said liquid-crystal display apparatus for modulating visible-domain light generated by said light source on the basis of image data and transmitting invisible domain light generated by said light source, wherein each of the liquid-crystal devices comprises a pair of transparent substrates facing each other and color filters placed on one of the substrates that is disposed closer to the light source; a plurality of light receiving devices laid out in said display face region as devices each used for receiving the visible-domain light and the invisible-domain light; display driving means for driving said liquid-crystal devices on the basis of said image data so as to radiate visible-domain light from said display face as display light; light-reception driving means for driving said light receiving devices to detect the visible-domain light and the invisible-domain light radiated from said display face and reflected by a detection-subject object reflecting said invisible-domain light generated by said light source and radiated from said display face, as detected light; a received-light signal receiver for acquiring a received-light signal obtained from the light receiving devices for one horizontal line; a received-light signal holding means for reconfiguring the received-light signal and storing the reconfigured received-light signal in a memory; and a position detection means for carrying out signal processing for detecting position of said detection-subject object on the basis of the reconfigured received-light signal.