Patent ID: 8026675

Claim:
A light emitting diode driving circuit comprising: at least one ladder network circuit comprising: (n+1) number of first branches connected in a line with one another by n number of first middle junction points between a first junction point and a second junction point, where n denotes an integer satisfying n≧2, (n+1) number of second branches connected in a line with one another by n number of second middle junction points between the first junction point and the second junction point, the (n+1) number of second branches connected in parallel with the first branches; and n number of middle branches connecting the first and second middle junction points of an identical m sequence to each other, respectively, 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.