Light sensitivity controlling apparatus and projection-type display device equipped with same

摘要

The light sensitivity controlling apparatus comprises an optical semiconductor, an amplifier element, a resistor unit, an A/D converter, and a controller. The optical semiconductor receives a plurality of colors of light emitted from a light source in a time division. The amplifier element converts optical current flowing to the optical semiconductor into voltage by receiving the plurality of colors of light. The resistor unit switches the gain for converting the optical current inputted to the amplifier element into voltage, for each of the plurality of colors of light. The A/D converter converts the voltage outputted by the amplifier element from an analog signal into a digital signal. The sensitivity controlling apparatus controls the resistor unit so that the output level corresponding to the various colors of light outputted from the A/D converter will remain substantially same level.

主权项

1. A light sensitivity controlling apparatus, comprising:
an optical semiconductor configured to receive a plurality of colors of light emitted from a light source in a time division; an amplifier element configured to convert optical current flowing to the optical semiconductor into voltage by receiving the plurality of colors of light; a resistor unit configured to switch the gain for converting the optical current inputted to the amplifier element into voltage, corresponding to each of the plurality of colors of light; an A/D converter configured to convert the voltage outputted by the amplifier element from an analog signal into a digital signal; and a controller configured to control the resistor unit so that the output level corresponding to the various colors of light outputted from the A/D converter remains substantially at the same level.