Patent ID: 6801263
Filing Date: 2004-10-05
Classification: G02B,H04N

Abstract:
A liquid crystal display apparatus comprising:a liquid crystal display device including a light modulating meansjiaving a front surface and a back side, a first polarizing filter, arranged on the front surface of said light modulating means and a second polarizing filter arranged on the back side of said tight modulating means, said light modulating means including a pair of transparent electrode plates and liquid crystals sealed therein, said light modulating means having a plurality of horizontal lines and being operably configured to separately provide image information for a left eye of a viewer and for a right eye of a viewer via the horizontal lines; a first light source arranged on the back side of said liquid crystal display device operably configured to generate an illuminating light towards said liquid crystal display device, said first light source having a front surface, a polarizing filter unit deposed to filter light for the right eye of the viewer, arid a polarizing filter unit deposed to filter light for the lefl eye of the viewer, said polarizing filter unit for the right eye and said polarizing filter unit for the left eye having respective different directions of polarization and being fixedly mounted on left and right portions on the front surface of said light source, each of said polarizing filter unit for the right eye and said polarizing unit for the left eye having a front side; optical means arranged on the back side of said liquid crystal display device to collect the illuminating light from said light source and to direct the so-collected light on said liquid crystal display device; a second light source arranged on the front sidc of said liquid crystal display device to generate a light on the head of the viewer; a plurality of light receiving devices arranged on the front sides of said polarizing filter unit for the right eye and the polarizing filter unit for the left eye at a preset spacing therefrom; and position control means for processing and comparing the volumes of the received light in said light receiving devices to control the position of said first light source in the left-and-right direction; wherein the image information for the right eye and that for the left eye are alternately displayed by said light modulating means every horizontal line in agreement with light transmitting lines in said first and second polarizing filters; the light illuminated from said first light source through said polarizing filter unit for the right eye is incident on the right eye of the viewer through said liquid crystal display device, the light illuminated from said first light source through said polarizing filter unit for the left eye is incident on the left eye of the viewer through said liquid crystal display device, independently of the light from said first light source through said polarizing filter unit for the right eye; the volume of light illuminated from said second light source and reflected by the head of the viewer is sensed by said light receiving devices to detect the movement in the left-and-right direction of the head of the viewer; said position control means causing automatic movement of the position of the first light source in the left-and-right direction in agreement with the detected movement.