Projector and light detection circuit and light detection method thereof
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United States of America Patent
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Jul 27, 2021
Grant Date -
Sep 10, 2020
app pub date -
Feb 21, 2020
filing date -
Mar 5, 2019
priority date (Note) -
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Abstract
A light detection circuit for a projector is provided. The light detection circuit includes: a light transistor for receiving and sensing reflected light from a side of a color wheel driving motor of the projector, wherein the side of the color wheel driving motor includes a dark region and a bright region; a bias unit coupled to the light transistor for providing a bias voltage; an operation amplifier including a positive input coupled to the bias unit, a negative input coupled to the light transistor and the bias unit, and an output, the base unit providing the bias voltage to the positive input; and a feedback resistor coupled between the negative input of the operation amplifier and the output, wherein, a resistance of the feedback resistor causes the light transistor to be operated in a linear region.
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