| 摘要 |
PURPOSE: To obtain a system to be easily produced at a low cost without the necessity of high pressure-resistance in a detection signal reading circuit and a high sensitivity in a photosensor. CONSTITUTION: The system is provided with a sense line 22, a CS line 24 on which an output voltage is applied, a TFT 26 which is connected to the sense line 22 at the side of one terminal, connected to the CS line 24 at the side of the other terminal and controlled concerning a conduction state between one terminal and the other terminal by an input signal to a control terminal, the photosensor 29 whose one terminal is connected to the control terminal of the TFT 26 and a held capacity 28 which is connected to the photosensor 29 in parallel and by which a held voltage is supplied to the opposite terminal of the control terminal. The voltage of the CS line 24 is outputted to the sense line 22 via the TFT 26 as the detection signal.
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