| 摘要 |
<p>Since a photosensor using a diode is incapable of perform refresh because of the structure, and the leak characteristics are unstable, the diode is not suitable for the photosensor. On the other hand, in a photosensor using a thin film transistor, since light quantity is very small, there has been a problem that feedback is difficult. A detection circuit converting an output current into a voltage is added to a photosensor using a thin film transistor. Thus, it is possible to convert a very small current into a voltage in a desired range enabling feedback. In addition, by varying resistors, capacitors, and the number of TFTs connected in the photosensor included in the circuit, it is made possible to change the sensitivity of the photosensor.</p> |
