Patent ID: 8339525
Filing Date: 2012-12-25
Classification: G09G,H04N

Abstract:
1. A projection device with a brightness adjustment function comprising: a polarization beam splitter (PBS); a light source for emitting light to the PBS; a reflective display; the PBS for reflecting a portion of the light to the reflective display, and transmitting a remaining portion of the light; the reflective display for receiving the portion of the light reflected by the PBS, and reflecting the received light to the PBS; a lens module for projecting the images to be displayed by the reflective display; the PBS further for transmitting the light reflected by the reflective display to the lens module; a power supply unit for supplying power for the light source; a light detection unit for acquiring a digital value of a portion of the light reflected by the PBS that is not received by the reflective display, and comparing the digital value with a predetermined digital value to generate a control signal; and a power controller for adjusting power from the power supply unit to the light source according to the control signal until the digital value matches the predetermined digital value of the light from the light source.