Patent ID: 7864142
Filing Date: 2011-01-04
Classification: G09G,H05B

Abstract:
1. A light-emitting diode drive circuit comprising: a plurality of series drive circuits each including a predetermined number of light-emitting diodes connected in series; a constant-current circuit operating to output a constant amount of current to, among the plurality of series drive circuits, a series drive circuit serving as a reference, the plurality of series drive circuits being connected in parallel with the current output; a current mirror circuit operable to allow the same amount of current to flow through the plurality of series drive circuits, the current mirror circuit including a transistor in each of the plurality of series drive circuits; and a voltage dropping circuit operable to cause a voltage drop of a predetermined level in the series drive circuit serving as the reference, the voltage dropping circuit being disposed in series with the light-emitting diodes forming the series drive circuit serving as the reference, wherein,