Patent ID: 7394449

Claim:
A back-light apparatus for an LCD device comprising: a light emitting unit including a plurality of light emitting diodes arranged on a substrate, wherein the plurality of light emitting diodes are connected in parallel and in series based upon a position of a plurality of selection switches; a power unit to supply power to the light emitting diodes of the light emitting unit; and a control unit to control connections between the light emitting diodes of the light emitting unit, wherein the light emitting unit comprises: a first common line mounted on the substrate such that first electrodes of the light emitting diodes are commonly connected to the first common line; a second common line mounted on the substrate such that second electrodes of the light emitting diodes are commonly connected to the second common line; a plurality of third lines arranged between preceding second electrodes of the light emitting diodes and succeeding first electrodes; first selection switches and second selection switches for connecting or disconnecting the first and second electrodes connected to the first common line and the second common line in parallel; and third selection switches for disconnecting or connecting the light emitting diodes in series.