| 摘要 |
In a display device having a coordinate input device in a display system, light beams emitted from all the plurality of light emitting devices are arranged in an X-Y matrix inside a rectangular coordinate input area. When light shielding signals are detected through a light receiving device in X direction and also through a light receiving device in Y direction, the optical coordinate input device obtains the position coordinate of an intersection of a line from the light receiving device in X direction and a line from the light receiving device in Y direction, and displays position information on the display screen in accordance with thus-obtained position coordinate.
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