| abstract |
A liquid crystal display apparatus is provided that includes a liquid crystal display device having two polarizing filter arranged on opposite sides of a light modulating unit. The liquid crystal display apparatus also includes a back light on the back side of the liquid crystal display device, two eye polarizing filters fixedly mounted on the back light, an infrared LED arranged on the front side of the liquid crystal display device for illuminating the light on the head of a viewer, and light receiving devices deposed at a present spacing from the front sides of the two eye polarizing filter unit. Moreover, the liquid crystal display apparatus includes a position control unit for processing and comparing the volumes of the light by the light receiving devices to control the position of the back light in the left-and-right direction. |