| 摘要 |
An input position detection system (1) according to the present invention includes a laser pointer (50) that emits infrared light, and a liquid crystal display device (10) that detects a position of an input from the input pointer (50) by detecting the infrared light. The liquid crystal display device (10) includes optical sensor elements (30), a received light intensity calculation circuit (31), a coordinate extracting circuit (32), a combining and calculating circuit (33), an input signal calculation circuit (35), and the like. The combining and calculating circuit (33) calculates the intensities of received light at respective coordinate positions on the basis of the information obtained by the coordinate extracting circuit (32) and the received light intensity calculation circuit (31). The input signal calculation circuit (35) calculates a distance of the laser pointer (50) from an image display surface, and detects the three-dimensional position of the laser pointer on the basis of the received light intensity information. The input position detection system thus handles three-dimensional pointing with a higher degree of accuracy.
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