Lamp driving structure for backlight module

A lamp driving structure for backlight module includes a backlight module implemented for disposing a first circuit board and a second circuit board thereon, the first circuit board couples with the second circuit board through a transmission line; the structure further includes at least a square wave controller, two square wave switches, a mutually coupled transformer, a plurality of driving transformers and a plurality of connectors disposed selectively on the first circuit board and the second circuit board, thereby reducing the number of driving transformers and connectors and the area of circuit boards to further reduce the manufacturing cost of the lamp driving device.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a lamp driving structure for backlight module, and more particularly, to a lamp driving structure which can reduce the number of driving transformers and connectors and the area of circuit board used in backlight module.

2. Description of the Prior Art

Please refer toFIG. 1for a traditional lamp driving structure for backlight module. From the lamp driving structure1depicted inFIG. 1, a first circuit board11and a second circuit board12are disposed on a backlight module13, and the first circuit board11couples with the second circuit board12through a transmission line14; the first circuit board11has a square wave controller111, a square wave switch112, a plurality of driving transformers113and a plurality of connectors114disposed thereon, the second circuit board12has a square wave switch121, a plurality of driving transformers122and a plurality of connectors123, and a plurality of connectors114,123of the first circuit board11and the second circuit board12connect to a plurality of lamps to drive the lamps from both ends. However, since a plurality of driving transformers are required on both the first circuit board and the second circuit board, therefore the area of the circuit boards must be designed accordingly, under such structure, how to reduce the number of driving transformers and connectors and the area of circuit boards and to further reduce the manufacturing cost of the lamp driving device, has become an important issue for manufacturers.

Therefore, the above-mentioned traditional lamp driving structure for backlight module presents several shortcomings to be overcome.

In view of the above-described deficiencies of traditional lamp driving structure, after years of constant effort in research, the inventor of this invention has consequently developed and proposed a new lamp driving structure for backlight module in the present invention.

SUMMARY OF THE INVENTION

The present invention is to provide a lamp driving structure for backlight module. The lamp driving structure comprises a few electronic components selectively disposed on circuit boards, thereby reducing the number of driving transformers and connectors and the area of circuit boards to further reduce the manufacturing cost of the lamp driving device and to drive the lamps on both ends.

The present invention is to provide a lamp driving structure for backlight module, the lamp driving structure can help reduce the cost of lamp driving device, simplify manufacturing process, enhance product stability, improve product lifetime and to save installation space.

The present invention discloses a lamp driving structure for backlight module the structure comprises a backlight module implemented for disposing a first circuit board and a second circuit board thereon, said first circuit board couples with said second circuit board through a transmission line; said structure further comprises at least a square wave controller, two square wave switches, a mutually coupled transformer, a plurality of driving transformers and a plurality of connectors disposed selectively on said first circuit board and said second circuit board, thereby reducing the number of driving transformers and connectors and the area of circuit boards to further reduce the manufacturing cost of the lamp driving device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Please refer toFIG. 2for a first embodiment of a lamp driving structure for backlight module disclosed in the present invention. InFIG. 2, a lamp driving structure2comprises a backlight module21for liquid crystal display (LCD). The backlight module21is implemented for disposing a first circuit board22, a second circuit board23and a transmission line24thereon.

The first circuit board22comprises a square wave controller221, a square wave switch222, a plurality of driving transformers223and a plurality of connectors224. When a DC power is supplied to the square wave controller221and the square wave switch222, the square wave switch222receives a control signal from the square wave controller221and converts the DC power into an AC power and then outputs the AC power to primary sides of the plurality of driving transformers223, and then secondary sides of the plurality of driving transformers223drive a plurality of lamps through the plurality of connectors224based on the AC power.

The second circuit board23comprises a square wave switch231, a mutually coupled transformer232and a plurality of connectors233. When a DC power is supplied to the square wave switch231, the square wave switch231receives the control signal from the square wave controller221of the first circuit board22through a transmission line24and converts the DC power into the AC power for outputting to a primary side of the mutually coupled transformer232, and then a secondary side of the mutually coupled transformer232drives a plurality of lamps through the plurality of connectors233based on the AC power. The second circuit board23can comprise more than one mutually coupled transformers232connecting to a mutually coupled terminal of lamps independently or in series or in parallel for reducing the output power of one mutually coupled transformer232.

The transmission line24is disposed between the first circuit board22and the second circuit board23and used for transmitting the control signal of the square wave controller221.

Please refer toFIG. 3for a second embodiment of a lamp driving structure for backlight module disclosed in the present invention. InFIG. 3, a lamp driving structure3comprises a backlight module31for liquid crystal display. The backlight module31is implemented for disposing a first circuit board32, a second circuit board33and a set of high voltage transmission lines34thereon.

The first circuit board32comprises a square wave controller321, two square wave switches322, a mutually coupled transformer323, a plurality of driving transformers324and a plurality of connectors325. When a DC power is supplied to the square wave controller321and two square wave switches322, two square wave switches322receive a control signal from the square wave controller321and convert the DC power into a first AC power and then output the first AC power to primary sides of the mutually coupled transformer323and the plurality of driving transformers324respectively, and then the secondary side of the mutually coupled transformer323outputs a second AC power to the second circuit board33through the set of high voltage transmission lines34, while secondary sides of the plurality of driving transformers324also output the second AC power through the plurality of connectors325to drive a plurality of lamps;

The second circuit board33comprises a plurality of connectors331for receiving the second AC power from the set of high voltage transmission lines34and driving the plurality of lamps.

The set of high voltage transmission lines34is disposed between the first circuit board32and the second circuit board33for transmitting the second AC power outputted from the mutually coupled transformer323.

Please refer toFIG. 4for a third embodiment of a lamp driving structure for backlight module disclosed in the present invention. InFIG. 4, a lamp driving structure4comprises a backlight module41for liquid crystal display, the backlight module41is implemented for disposing a circuit board42and a set of high voltage transmission lines43thereon.

The circuit board42comprises a square wave controller421, two square wave switches422, a mutually coupled transformer423, a plurality of driving transformers424and a plurality of connectors425. When an DC power is supplied to the square wave controller421and two square wave switches422, two square wave switches422receive a control signal from the square wave controller421and convert the DC power to a first AC power, and then output the first AC power to primary sides of the mutually coupled transformer423and the plurality of driving transformers424respectively, and then the secondary side of the mutually coupled transformer423outputs a second AC power to a mutually coupled terminal of lamps44through the set of high voltage transmission lines to further drive a plurality of lamps on one side of the backlight module41, while secondary sides of the plurality of driving transformers424also output the second AC power through the plurality of connectors425to drive a plurality of lamps.

The set of high voltage transmission lines43is disposed for transmitting the second AC power outputted from the mutually coupled transformer423to a mutually coupled terminal of lamps44.

The present invention provides a lamp driving structure for backlight module, while compared to other traditional lamp driving structures, is advantageous in that:1. The present invention provides a lamp driving structure for backlight module. The lamp driving structure comprises a few electronic components selectively disposed on circuit boards, thereby reducing the number of driving transformers and connectors and the area of circuit boards to further reduce the manufacturing cost of the lamp driving device and to drive the lamps on both ends.2. The present invention provides a lamp driving structure for backlight module, the lamp driving structure can help reduce the cost of lamp driving device, simplify manufacturing process, enhance product stability, improve product lifetime and to save installation space.