| 摘要 |
A semiconductor apparatus is provided to improve the uniformity of an output by measuring an illumination region with one light sensor. A light detecting circuit(2900) includes a light sensor(2901) and a current voltage converting circuit(2902). A comparing circuit(2904) compares an output voltage with a reference voltage of the light detecting circuit. A control circuit(2906) outputs a control signal on the basis of the output signal of the comparing circuit. A resistance value of the current voltage converting circuit is controlled by the control signal. The light sensor includes a photo diode. The reference voltage is generated by a reference voltage generating circuit(2905). The light detecting circuit is electrically connected to the comparing circuit through an amplifier. The light sensor outputs a current signal corresponding to the detected illumination. The current voltage converting circuit converts the current signal into a voltage signal.
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