Patent ID: 8610660
Filing Date: 2013-12-17
Classification: G09G,H05B

Abstract:
1. A light emitting diode (LED) backlight driving circuit, comprising an inductor and a boost switching transistor, wherein a first terminal of the inductor is connected to a direct current (DC) input voltage, a second terminal of the inductor is connected to a first terminal of the boost switching transistor, and a second terminal of the boost switching transistor is connected to ground, and the LED backlight driving circuit further comprising: n LED current balance circuits, wherein n is a number of LED strings, and n is a natural number greater than 1, wherein a first LED current balance circuit comprises a first current balance switch and a secondary winding of a first transformer, an input terminal of the first current balance switch is connected to the first terminal of the boost switching transistor, and an output terminal of the first current balance switch is connected to an opposite-polarity terminal of the secondary winding of the first transformer, and a common-polarity terminal of the secondary winding of the first transformer is connected to an input terminal of a 1 an n when n>2, 1<i<n, and i is a natural number, an i output terminals of all of the LED strings are connected to the second terminal of the boost switching transistor and the ground.