| 摘要 |
<p>An optical sensor providing enhanced reliability in sensing peripheral light and reduced power consumption, and a liquid crystal display device incorporating this optical sensor. In the optical sensor, a first transistor is electrically coupled between a first power supply and a second transistor, which is electrically coupled between the first transistor and a second power supply having a voltage less than that of the first power supply. The first transistor is either turned-on or turned-off according to a control signal. The second transistor controls an amount of an electric current flowing from the first transistor to the second power supply corresponding to an intensity of peripheral light. A sensing section is constructed with a first capacitor electrically coupled to the second transistor in parallel. A gate electrode of the second transistor is electrically coupled to the second power supply.
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