Patent ID: 8690337
Filing Date: 2014-04-08
Classification: G06F,H04N

Abstract:
1. An image display device for emitting laser light to display first and second images on first and second projection target planes, respectively, comprising: a laser light source for emitting the laser light; a scanning unit configured to scan said laser light on a frame-by-frame basis; a light splitting element for splitting said laser light scanned by said scanning unit into first laser light directed to said first projection target plane and second laser light directed to said second projection target plane; a photosensor for sensing said second laser light reflected by an external object on said second projection target plane; and a controller configured to control the operation of said image display device, wherein said controller is configured: to operate said scanning unit with a predetermined scan frequency, to control timing of emission of said laser light by said laser light source based on image data corresponding to said image and said scan frequency, to calculate a position of said external object based on a scan position of said laser light according to light sensing timing of said light sensor, to produce an instruction for changing said image data when a plurality of said positions are calculated according to said light sensing timing included in a scan period of a predetermined number of said frames and at least one of said positions moves, and to produce said instruction when a first calculated position is in a predetermined region and a second calculated position moves longer than a threshold distance.