| 摘要 |
PROBLEM TO BE SOLVED: To provide a photodetector whose structure is simple, and whose manufacturing costs are low capable of preventing the deterioration of an image picture. SOLUTION: A light detector is provided with a photodiode whose anode is connected to a reference voltage, an initialization MOS transistor connected between the cathode of the photodiode and a first power supply voltage for setting the cathode as the first power supply voltage in an initialization phase, and a means for setting the cathode of the photodiode as a saturation voltage near the reference voltage just before the initialization phase for measuring the voltage of the cathode of the photodiode.
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