CN201104276Y - Side light type backlight module - Google Patents

Abstract

The utility model discloses a side light type backlight module, it includes first luminescence unit, second luminescence unit, first high pressure linkage unit and second high pressure linkage unit. The first light emitting unit has a first electrode and a second electrode, and the second light emitting unit has a third electrode and a fourth electrode. The fourth electrode is electrically connected with the second electrode of the first light-emitting unit. The first high-voltage connection unit is electrically connected with the first electrode of the first light-emitting unit, and the second high-voltage connection unit is electrically connected with the third electrode of the second light-emitting unit. The utility model discloses a sidelight type backlight module can save the connecting elements, and then saves the cost.

Description

Edge-lit backlight module

technical field

The utility model relates to a backlight module, in particular to a side light type backlight module.

Background technique

Compared with the traditional cathode ray tube (CRT) display, the liquid crystal display (LCD) has the advantages of small size, low power consumption, and low radiation, and the process technology of the liquid crystal display is compatible with the semiconductor process technology. Therefore, liquid crystal displays have gradually replaced cathode ray tube displays and become the mainstream of displays in recent years.

A general liquid crystal display device mainly includes a liquid crystal display unit and a backlight module, wherein the backlight module can be roughly divided into two types: a direct type backlight module and an edge type backlight module. However, no matter what type of backlight module it is, at least one driving circuit board is required to drive the light emitting unit in the backlight module. It is driven by the high-voltage driving signal provided by the driving circuit board.

Please refer to FIG. 1 , which is a schematic diagram of a known dual-tube edge-lit backlight module. The double lamp tubes 11 and the driving circuit board 13 are connected, and the assembly instructions are as follows. The two electrode terminals 111 and 112 of each lamp tube 11 are respectively electrically connected to the high-voltage wire 12 with a connection terminal 121 or 122 that is resistant to high voltage. The output terminal V _H , the electrode terminal 112 is connected to the ground terminal GND of the driving circuit board 13 via another high-voltage wire 12 via the connecting terminal 122 . At this time, the high-voltage driving signal output by the driving circuit board 13 can be transmitted to the lamp tube 11 through the high-voltage output terminal V _H , the connection terminal 121 and the high-voltage wire 12 to drive the lamp tube 11 .

Based on the above, the light tube needs two high-voltage connection terminals and two high-voltage wires. When more light tubes are used in the backlight module, the number will increase exponentially, and the cost will inevitably increase accordingly.

Utility model content

In view of the above problems, the purpose of the present utility model is to provide an edge-lit backlight module which can save high-voltage connection components and save costs.

To achieve the above purpose, the utility model provides an edge-lit backlight module, which includes a first light emitting unit, a second light emitting unit, a first high voltage connection unit and a second high voltage connection unit. The first light emitting unit has a first electrode and a second electrode, and the second light emitting unit has a third electrode and a fourth electrode. Wherein, the fourth electrode is electrically connected with the second electrode of the first light emitting unit. The first high voltage connection unit is electrically connected to the first electrode of the first light emitting unit, and the second high voltage connection unit is electrically connected to the third electrode of the second light emitting unit.

Based on the above, according to the edge-lit backlight module of the present invention, the second electrode of the first light-emitting unit and the fourth electrode of the second light-emitting unit are electrically connected through terminals, wires or welding technology. Therefore, in the edge-lit backlight module of the present invention, the two light-emitting units only need to use two high-voltage connection units to be connected to the electrodes of the first light-emitting unit and the second light-emitting unit respectively. Therefore, compared with the prior art, the edge-lit backlight module of the present invention can save connecting components, thereby saving costs.

Description of drawings

FIG. 1 is a schematic diagram of a known dual-tube edge-lit backlight module;

FIG. 2 is a schematic structural view of an edge-lit backlight module in a preferred embodiment of the present invention;

3A to 3C are schematic diagrams of connection of edge-lit backlight modules in preferred embodiments of the present invention; and

FIG. 4 is a schematic diagram of driving signals of an edge-lit backlight module in a preferred embodiment of the present invention.

Explanation of reference signs

11: Light tube 111, 112: Electrode terminal

12, 241, 251: High voltage wires 121, 122: Connecting terminals

V _H : High voltage output terminal 13: Drive circuit board

2: Edge-lit backlight module 21: Light source

211, 212: Light-emitting unit 22: Light guide plate

221: Light-emitting surface 23: Housing

24: The first high-voltage connection unit 25: The second high-voltage connection unit

242, 252, 262, 263: High voltage connection terminals 26: Drive circuit board

261: Drive unit 271, 272: Metal wire

28: Lead wire 29: Metal sleeve

E1, E2, E3, E4: Electrodes V ₁ , V ₂ : Driving signals

V _P : peak value

Detailed ways

Hereinafter, an edge-lit backlight module according to a preferred embodiment of the present invention will be described with reference to relevant figures.

Referring to FIG. 2 , the edge-lit backlight module 2 of the preferred embodiment of the present invention includes a light source 21 , a light guide plate 22 and a housing 23 . The light source 21 and the light guide plate 22 are disposed in the casing 23 . The light guide plate 22 has a light emitting surface 221 , and the light source 21 is disposed on a side perpendicular to the light emitting surface 221 .

Please also refer to FIG. 3A , the edge-lit backlight module 2 includes a first high-voltage connection unit 24 , a second high-voltage connection unit 25 and a driving circuit board 26 .

The light source 21 includes a plurality of light emitting units. In this embodiment, the light source 21 has a first light emitting unit 211 and a second light emitting unit 212 as an example for illustration. In this preferred embodiment, the first light emitting unit 211 and the second light emitting unit 212 are cold cathode fluorescent lamps (CCFL) or external electrode fluorescent lamps (EEFL).

The first light emitting unit 211 has a first electrode E1 and a second electrode E2, and the second light emitting unit 212 has a third electrode E3 and a fourth electrode E4. Wherein, the second electrode E2 is electrically connected to the fourth electrode E4.

The edge-lit backlight module of the present utility model uses terminals, lead wires, and metal sleeve welding or welding techniques to electrically connect the second electrode E2 of the first light-emitting unit 211 and the fourth electrode E4 of the second light-emitting unit 212, but not This is the limit. The fusion technology includes electric welding fusion technology or gas welding fusion technology.

In this embodiment, the second electrode E2 has a first metal wire 271 , and the fourth electrode E4 has a second metal wire 272 . The first metal wire 271 can be connected to the second metal wire 272 by welding or welding technology, so as to electrically connect the fourth electrode E4 to the second electrode E2 . Here, the fusion technique may include electric welding fusion technique or gas welding fusion technique. Referring to FIG. 3A , the first metal wire 271 of the second electrode E2 and the second metal wire 272 of the fourth electrode E4 are bent, and then electrically connected by welding or welding.

The first metal wire 271 and the second metal wire 272 can also be electrically connected through terminals.

The first metal wire 271 of the second electrode E2 and the second metal wire 272 of the fourth electrode E4 can be electrically connected to each other by a lead wire 28, which can be welded, welded or mechanically constructed so that the lead wire 28 is connected to the second metal wire respectively. The electrode E2 and the fourth electrode E4 are electrically connected, as shown in FIG. 3B . In this embodiment, the lead wire 28 can be a metal strip or a metal rod.

In addition to the above connection methods, please refer to FIG. 3C , the lead wire 28 can also be replaced by a metal sleeve 29 . The first metal wire 271 of the first light-emitting unit 211 and the second metal wire 272 of the second light-emitting unit 212 are both disposed in the metal casing 29 and electrically connected to the metal casing 29 by welding or welding technology.

Referring to FIG. 3A again, the first high voltage connection unit 24 has a first high voltage wire 241 and a first high voltage connection terminal 242 , and the second high voltage connection unit 25 has a second high voltage wire 251 and a second high voltage connection terminal 252 . The first high voltage wire 241 is electrically connected to the first high voltage connection terminal 242 and the first electrode E1 respectively, and the second high voltage wire 251 is electrically connected to the second high voltage connection terminal 252 and the third electrode E3 respectively.

The driving circuit board 26 includes a driving unit 261 , a third high voltage connection terminal 262 and a fourth high voltage connection terminal 263 . The third high voltage connection terminal 262 is electrically connected to the positive high voltage end of the drive unit 261 and the first high voltage connection terminal 242 respectively, and the fourth high voltage connection terminal 263 is electrically connected to the negative high voltage end of the drive unit 261 and the second high voltage connection terminal 252 respectively. connect.

The driving unit 261 generates an alternating current driving signal V ₁ having a first phase and an alternating current driving signal V ₂ having a second phase. The driving signal V ₁ drives the first light emitting unit 211 via the third high voltage connection terminal 262 and the first high voltage connection unit 24 . The driving signal V ₂ drives the second light emitting unit 212 via the fourth high voltage connection terminal 263 and the second high voltage connection unit 25 . In this preferred embodiment, the driving signal V ₁ output from the positive high-voltage end of the driving unit 26 and the driving signal V ₂ output from the negative high-voltage end have the same peak value V _P and frequency, and the phase difference is 180 degrees, as shown in the figure 4.

It is worth mentioning that, when using a double-lamp structure, the edge-lit backlight module 2 of this embodiment only needs to use two high-voltage connection terminals (the first high-voltage connection terminal 242 and the second high-voltage connection terminal 252), and two The high voltage wires (the first high voltage wire 241 and the second high voltage wire 251 ) drive the first light emitting unit 211 and the second light emitting unit 212 . In other words, only two high-voltage connection terminals and two high-voltage wires are needed for a set of double-lamp structures. When more double-lamp structures are required in the backlight module, the number of high-voltage connection components can be greatly reduced and the cost can be reduced.

In summary, the edge-lit backlight module of the present invention is electrically connected to the second electrode of the first light-emitting unit and the fourth electrode of the second light-emitting unit through wire or welding technology. In the known technology, one light-emitting unit needs two high-voltage connection terminals and two high-voltage wires, but one light-emitting unit of the edge-lit backlight module of the present invention only needs one high-voltage connection terminal and one high-voltage wire. Therefore, the side-light type backlight module of the present invention can save connecting components, thereby saving costs.

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present utility model shall be included in the appended claims.

Claims (16)

1. An edge-lit backlight module, characterized in that it comprises: The first light emitting unit has a first electrode and a second electrode; the second light emitting unit has a third electrode and a fourth electrode, and the fourth electrode is electrically connected to the second electrode of the first light emitting unit; a first high voltage connection unit electrically connected to the first electrode of the first light emitting unit; and The second high voltage connection unit is electrically connected with the third electrode of the second light emitting unit. 2. The edge-lit backlight module according to claim 1, characterized in that the fourth electrode of the second light-emitting unit and the second electrode of the first light-emitting unit are connected by terminals, leads, metal sleeves, welding, electric welding Electrical connection by welding or gas welding fusion technology. 3. The edge-lit backlight module as claimed in claim 1, wherein the second electrode has a first metal wire, and the fourth electrode has a second metal wire. 4. The edge-lit backlight module as claimed in claim 3, wherein the first metal wire and the second metal wire are electrically connected through a terminal. 5. The edge-lit backlight module as claimed in claim 3, wherein the first metal wire and the second metal wire are electrically connected by welding, electric welding or gas welding through lead wires or metal sleeves. 6. The edge-lit backlight module according to claim 3, wherein the first metal wire of the first electrode and the second metal wire of the fourth electrode are bent and welded, welded by electric welding or welded by gas welding. Technical electrical connection. 7. The edge-lit backlight module as claimed in claim 1, further comprising a driving circuit board electrically connected to the first high-voltage connection unit and the second high-voltage connection unit. 8. The edge-lit backlight module according to claim 7, wherein the first high-voltage connection unit has a first high-voltage wire and a first high-voltage connection terminal connected to the first high-voltage wire. 9. The edge-lit backlight module according to claim 8, wherein the first high-voltage wire is electrically connected to the first electrode of the first light-emitting unit, and the first high-voltage connection terminal is connected to the drive circuit board. The third high voltage connection terminal is electrically connected. . 10. The edge-lit backlight module according to claim 8, wherein the second high-voltage connection unit has a second high-voltage wire and a second high-voltage connection terminal connected to the second high-voltage wire. 11. The edge-lit backlight module according to claim 10, wherein the second high-voltage wire is electrically connected to the third electrode of the second light-emitting unit, and the second high-voltage connection terminal is connected to the drive circuit board. The fourth high voltage connection terminal is electrically connected. 12. The edge-lit backlight module according to claim 9 or 11, wherein the driving circuit board further comprises: The driving unit is electrically connected with the third high voltage connection terminal and the fourth high voltage connection terminal. 13. The edge-lit backlight module according to claim 12, characterized in that the driving unit generates a driving signal of an alternating current with a first phase and a driving signal of an alternating current with a second phase, respectively connected by the third high-voltage connection terminal And the output of the fourth high voltage connection terminal. 14. The edge-lit backlight module according to claim 13, wherein the driving signals of the first phase and the second phase of alternating current have the same peak value and frequency, and the difference between the first phase and the second phase is one One hundred and eighty degrees. 15. The edge-lit backlight module according to claim 1, further comprising a light guide plate, the first light-emitting unit and the second light-emitting unit are disposed on a side perpendicular to the light-emitting surface of the light guide plate. 16. The edge-lit backlight module as claimed in claim 1, wherein the first light-emitting unit and the second light-emitting unit are cold-cathode tubes, external electrode fluorescent tubes or hot-cathode tubes.

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