Patent ID: 8653738

Claim:
A backlight module comprising: an LED module having a plurality of light emitting diodes, wherein the light emitting diodes are averagely divided into a plurality of light strings, wherein the light emitting diodes of each of the light strings are connected in series and each of the light strings has a first connecting end and a second connecting end, each of the light emitting diodes has a forward voltage, wherein the forward voltage of each of the light emitting diodes is ranged between a minimum forward voltage value and a maximum forward voltage value, and each of the light strings at least has one first light emitting diode and one second light emitting diode, wherein the first light emitting diode has the minimum forward-voltage value, the second light emitting diode has the maximum forward-voltage value and the forward voltages of the light emitting diodes of each of the light string increase progressively from the minimum forward-voltage value to the maximum forward-voltage value in turn, and the average of the forward voltage values of the light emitting diodes of each of the light strings is the same as the average of the forward voltage values of the light emitting diodes of other one of the light strings; a DC/DC converter connected to the first connecting ends of the light strings; and a constant current control circuit connected to the second connecting ends of the light strings.