Patent ID: 8441195
Filing Date: 2013-05-14
Classification: H05B

Abstract:
1. An illumination adjustment circuit comprising: a light sensitive unit; an amplification unit; a switch unit including a plurality of electronic switches with increasing threshold voltages; a light emitting unit including a plurality of sets of light emitting diodes corresponding to the electronic switches, wherein each set of the light emitting diodes is connected to the amplification unit through one of the electronic switches corresponding thereto; and a processing unit connecting to each of the switches, wherein the processing unit detects the on/off status of the switches, and determines the luminous status of the sets of light emitting diodes by detected status signals; wherein the light sensitive unit detects the brightness of ambient light, outputting a first voltage to the amplification unit accordingly, the amplification unit amplifies the first voltage to a second voltage and outputs the second voltage to the switch unit, so that the electronic switches with the threshold voltages lower than the second voltage are turned on, and the set of light emitting diodes connected to the electronic switches are turned on.