Patent ID: 6304288
Filing Date: 2001-10-16
Classification: H04N

Abstract:
A head tracking stereoscopic display comprising:light emitting means comprising at least two combining light sources, each combining light source comprised of a set of two line-shaped light sources for one of the eyes and the other eye, the two line-shaped light sources being for a first area and a second area in a position shifted by approximately E/2 (E is the distance between the eyes of a viewer) in the horizontal direction from the first area;a diffusing screen provided on the light emission side of said light emitting means;a first lenticular long screen provided between said diffusing screen and the light emitting means for focusing light from a selected one of the line-shaped light sources and alternately forming bright portions and dark portions on said diffusing screen by semi-cylindrical lens portions constituting the first lenticular lens screen;a second lenticular lens screen provided on the light emission side of said diffusing screen and having the function of taking each of said bright portions formed on the diffusing screen as a light source for either one of the eyes;an image display panel provided on the light emission side of the second lenticular lens screen;light source control means for alternately turning one of the line-shaped light sources and the other line-shaped light source in a selected one combining light source on and off;display control means for alternately displaying one of the images and the other image which have binocular parallax on said image display panel in synchronization with an alternate ON/OFF of said line-shaped light sources;head position detection means for detecting the position of the head of the viewer; andcontrol means for carrying out control as to change the timing of an alternate display of the images and select the line-shaped light sources on the basis of information relating to the head position from said head position detection means, wherein said control means is constructed to carry out control, letting n be an integer, E be the distance between the eyes of the viewer, and A be the horizontal distance from the center of a stereoscopic position right in front of a screen, to perform basic processing in selecting the timing of the alternate display of the images and the combining light sources when the viewer is in an area indicated by (2n-1/2).times.E.ltoreq.A.ltoreq.(2n+1/2).times.E on the basis of the center of the stereoscopic position right in front of the screen, while changing the timing of the alternate display of one of the images and the other image which have binocular parallax using as a light source to be selected the line-shaped light sources for the first area as it is when the viewer moves to an area indicated by {(2n+1)-1/2}.times.E<A<{(2n+1)+1/2}.times.E.