Patent ID: 8878843

Claim:
An image position adjustment device comprising: a light source unit which emits visible light and infrared light; a first movable reflecting unit for reflecting visible light and transmitting infrared light; a second movable reflecting unit for reflecting infrared light transmitted through the first movable reflecting unit; a display unit for displaying an image using visible light reflected by the first movable reflecting unit; and a line-of-sight detection unit for imaging a user using reflected light of infrared light reflected by the second movable reflecting unit on the user to detect a line-of-sight position of the user, wherein the line-of-sight position detection unit has an imaging element which acquires two-dimensional image information of the user, calculates image information in the depth direction of the user from the difference between the light-emission timing of infrared light and the light-reception timing of reflected light, acquires three-dimensional image information of the user on the basis of the image information in the depth direction of the user and the two-dimensional image information of the user acquired by the imaging element, and detects the line-of-sight position of the user on the basis of the three-dimensional image information of the user, and the position of the image is adjusted in accordance with the line-of-sight position detected by the line-of-sight detection unit, by changing a reflection angle of the first movable reflecting unit.