Patent ID: 8847907
Filing Date: 2014-09-30
Classification: G06F,G09G

Abstract:
1. A display device having a function of detecting a position at which light emitted from an input pointer was inputted on an image display surface of a display panel, wherein a display direction of a display image in the display panel is switched based on a radiation direction of light emitted from the input pointer, and wherein the display device comprises: a plurality of photo sensor elements arranged in a matrix so as to correspond to the image display surface of the display panel; a coordinate detecting section that detects positions on an array of the respective photo sensor elements arranged in a matrix where an input from the input pointer was received; a received light intensity detecting section that detects intensities of light received by the photo sensor elements; a coordinate and intensity combining section that derives intensities of the received light at respective coordinate positions by combining coordinates of input positions, which were obtained by the coordinate detecting section, and the intensities of light received at the coordinates, which were obtained by the received light intensity detecting section; an input position detecting section that derives coordinates of a center of gravity in a radiation region of light on the image display surface based on information of the received light intensities obtained by the coordinate and intensity combining section; a radiation direction determining section that determines a radiation direction of light emitted from the input pointer based on the coordinates derived by the input position detecting section; and a display direction switching section that switches a display direction of a display image based on the radiation direction of light, which was obtained by the radiation direction determining section.