Patent ID: 7659879
Filing Date: 2010-02-09
Classification: G09G,H05B

Abstract:
1. A backlight driving circuit comprising: a plurality of fluorescent lamps divided into first and second blocks, wherein each fluorescent lamp has first and second terminals; a first high-voltage part at a first portion of a rear side of an LCD panel to apply an A.C. high voltage to the first terminal of each fluorescent lamp arranged in the first block, wherein the first high-voltage part includes a plurality of first inverter circuits and a plurality of first connectors, wherein each first inverter circuit converts a D.C. voltage to the A.C. voltage, wherein each first connector connects the first terminal of the fluorescent lamp arranged in the first block to one terminal of the first inverter circuit; a first low-voltage part at a second portion of the rear side of the LCD panel to apply a lower electric potential than that of the first high-voltage part to the second terminal of each fluorescent lamp arranged in the first block, wherein the first low-voltage part includes a plurality of second connectors each connecting to the second terminal of the fluorescent lamp arranged in the first block; a first connection part connecting the first low-voltage part to a feedback terminal of the first high-voltage part, wherein the first connection part includes insulated wires corresponding to a number of fluorescent lamps arranged in the first block, and first and second feedback connectors electrically connecting the first high-voltage part to the first low-voltage part, wherein other terminals of the first inverter circuits are connected to the first feedback connector, wherein the second connectors are connected to the second feedback connector; a second high-voltage part at the second portion of the rear side of the LCD panel to apply an A.C. high voltage to the second terminal of each fluorescent lamp arranged in the second block, wherein the second high-voltage part includes a plurality of second inverter circuits and a plurality of third connectors, wherein each second inverter circuit converts a D.C. voltage to the A.C. voltage, wherein each third connector connects the second terminal of the fluorescent lamp arranged in the second block to one terminal of the second inverter circuit; a second low-voltage part at the first portion of the rear side of the LCD panel to apply a lower electric potential than that of the second high-voltage part to the first terminal of each fluorescent lamp arranged in the second block, wherein the second low-voltage part includes a plurality of fourth connectors each connecting to the first terminal of the fluorescent lamp arranged in the second block; a second connection part connecting the second low-voltage part to a feedback terminal of the second high-voltage part, wherein the second connection part includes insulated wires corresponding to a number of fluorescent lamps arranged in the second block, and third and fourth feedback connectors electrically connecting the second high-voltage part to the second low-voltage part, wherein other terminals of the second inverter circuits are connected to the third feedback connector, wherein the fourth connectors are connected to the fourth feedback connector, wherein the first and second high-voltage parts are arranged in a zigzag configuration alternating with the first and second low-voltage parts so as to prevent concentration of the high-voltage parts to one side of the LCD panel; and a protection circuit formed in the first and second low-voltage parts, wherein the protection circuit grounds a high voltage when the high voltage generates by connection failures between the first and second feedback connectors of the first connection part and the first high-voltage parts, when the high voltage generates by connection failures between the third and fourth feedback connectors of the second connection part and the second high-voltage part, when the high voltage generates by connection failures between the first and second feedback connectors of the first connection part and the first low-voltage part, or when the high voltage generates by connection failures between the third and fourth feedback connectors of the second connection part and the second low-voltage part.