Patent ID: 8419193

Claim:
A projection apparatus, comprising: an illumination unit, for generating a light source according to a plurality of driving signals and providing a temperature sensing signal according to a temperature of the light source, wherein the illumination unit comprises: a light emitting diode array, for providing a first color light, a second color light, and a third color light to compose the light source; and a temperature sensor, for sensing temperatures of the first color light, the second color light, and the third color light to generate the temperature sensing signal; a brightness detection circuit, for detecting a brightness of the light source and generating a plurality of brightness sensing signals, wherein the brightness detection circuit comprises a plurality of color sensors, wherein in a first integration mode, the color sensors are simultaneously turned on to detect the first color light, the second color light, and the third color light according to a sequence in which the first color light, the second color light, and the third color light are generated, and in a second integration mode, the color sensors are sequentially turned on for a predetermined time to respectively detect the first color light, the second color light, and the third color light, and the color sensors generate a plurality of sensing currents according to a detection result; a current-to-voltage converter, for converting the sensing currents into a plurality of sensing voltages; and an integrator, for integrating the sensing voltages in accordance with the first integration mode or the second integration mode to generate the brightness sensing signals; a signal conversion circuit, for converting the temperature sensing signal and the brightness sensing signals into temperature information and a plurality of brightness information; and a control unit, comprising a setting table for storing a predetermined temperature information and a plurality of predetermined brightness information, wherein the control unit adjusts the driving signals in order to identify the converted temperature information and the converted brightness information conform to the stored information in the setting table.