Patent ID: 8344664
Filing Date: 2013-01-01
Classification: G09G,H05B

Abstract:
1. A power saving LED (Light Emitting Diode) display board system in which each pixel is formed by combining at least one red LED, at least one blue LED and at least one green LED, comprising: a power converter for receiving an electric power from outside to convert the electric power; a red LED power supply for receiving the converted electric power from the power converter to supply a red LED operation power to the red LED; a green LED power supply for receiving the converted electric power from the power converter to supply a green LED operation power to the green LED; a blue LED power supply for receiving the converted electric power from the power converter to supply a blue LED operation power to the blue LED; and a DSP (Digital Signal Processor) for controlling the red LED power supply to convert the electric power supplied from the power converter into the red LED operation power, controlling the green LED power supply to convert the electric power supplied from the power converter into the green LED operation power and controlling the blue LED power supply to convert the electric power supplied from the power converter into the blue LED operation power, wherein each of the red LED power supply, the green LED power supply and the blue LED power supply includes a rectification circuit for supplying corresponding LED with a DC (Direct Current) power, wherein the rectification circuit has a rectification transistor having a frequency and a pulse width controlled by the DSP; and wherein when conducting, a voltage smaller than a conduct voltage for a diode is applied to the rectification transistor.