Patent ID: 8026675
Filing Date: 2011-09-27
Classification: H05B,Y02B,Y10S

Abstract:
1. A light emitting diode driving circuit comprising: at least one ladder network circuit comprising: wherein each of the first and second, and middle branches comprises at least one light emitting diode device, and m is a positive integer defining sequences of the respective (n+1) first and second branches and the n number of middle branches with respect to the first junction point; a first current loop having a first group of light emitting diode devices located on (2m−1) sequence of the first branches, 2m sequence of the second branches and the n number of middle branches, respectively to be connected in series with one another and driven in a first half cycle of an alternating voltage applied between the first and second junction points; and a second current loop having a second group of light emitting diode devices located on 2m sequence of the first branches, (2m−1) sequence of the second branches and the n number of middle branches, respectively to be connected in series with one another and driven in a second half cycle of an alternating voltage between the first and second junction points, wherein each of the first and second branches and middle branches comprises at least one light emitting diode, which emits light when activated by current passing therethrough.