Patent ID: 8390586
Filing Date: 2013-03-05
Classification: G02B,G06F,G09G

Abstract:
1. An image display apparatus comprising: a light source which emits visible light; a scanner which two-dimensionally scans light emitted from the light source to display an image on a screen in synchronism with the light source; a controller which controls the light source and the scanner based on data of the image to be displayed on the screen; an imaging device which picturizes an image of the image displayed on the screen; and a judger which judges presence or absence of a pointing element between the scanner and the screen, based on a temporal change in the image picturized by the imaging device, the pointing element being used to point at a position on the image, wherein the judger detects a reduction in a number of pixels which form the image displayed on the screen by comparing a current picturized image with a previous picturized image temporally in each divided picturized image, and judges that pointing out by the pointing element is performed when the detected reduction in the number of pixels is equal to or larger than a lower limit and equal to or smaller than an upper limit.