Patent ID: 8841857
Filing Date: 2014-09-23
Classification: H05B

Abstract:
1. A driving circuit, comprising: a plurality of light-emitting units, wherein the light-emitting units are coupled with each other in series and are driven with an input voltage varying according to a frequency; a plurality of switches, wherein each switch has a reference voltage and a critical activation voltage and comprises a light-emitting end and a bias end opposite to the light-emitting end, the light-emitting end is coupled with the light-emitting units, and the bias ends of the switches are coupled with each other; and a bias current module coupled with the bias ends of the switches and having an operating bias voltage varying according to the frequency, wherein each switch is driven to be activated or to be deactivated according to a relation of the critical activation voltage and a difference between the reference voltage and the operating bias voltage.