TWI389084B - Driving circuit device and backlight module - Google Patents

Description

Drive circuit device and backlight module

The invention relates to a driving circuit device and a backlight module.

Generally, a liquid crystal display device mainly includes a liquid crystal display unit and a backlight module. The backlight module can be roughly divided into two types: a direct type backlight module and a side light type backlight module.

In the backlight module, a cold cathode fluorescent lamp (CCFL) is generally used as a light-emitting unit, which is driven by at least one driving circuit device to provide a high-voltage driving signal.

Referring to FIG. 1 , in general, the light-emitting unit 11 (cold cathode fluorescent tube) and the driving circuit device 13 can be smoothly connected and assembled, and the light-emitting unit 11 is first fixed with a rubber 15 to fix the light-emitting unit. 11. The electrode ends 111 and 112 of the light-emitting unit 11 are respectively electrically connected to a connection line 12 having a high voltage resistance and having a connection terminal 121, and then connected to one of the connection terminals 131 of the drive circuit device 13 via the connection terminal 121 of the connection line 12. . At this time, the high-voltage driving signal outputted by the driver circuit 13 from the transformer 14 can be transmitted to the light-emitting unit 11 via the connection terminal 131, the connection terminal 121, and the connection line 12, and the light-emitting unit 11 can be driven.

In the above backlight module, since the high voltage driving signal provided by the driving circuit device 13 is usually a high voltage higher than the volts level, the connection terminal 131 on the driving circuit device 13 is in contact with the connection terminal 121 of the connecting line 12. When it is bad, it may cause arcing. In addition, since the connection of the connection terminal 121 and the connection terminal 131 must be manually assembled, more assembly man-hours will be incurred as the number of lamps is increased. Further, since the connecting member 12, the connecting terminal 121, the connecting terminal 131, and the like must be capable of withstanding high voltage, it is expensive.

According to the above description, how to provide a driving circuit device and a backlight module capable of avoiding the occurrence of flashover and reducing the number of components to save material cost and assembly man-hour is one of the current important topics.

In view of the above problems, it is an object of the present invention to provide a driving circuit device and a backlight module capable of avoiding the occurrence of a flashover phenomenon. Another object of the present invention is to provide a drive circuit device and a backlight module capable of reducing the number of machine components to save cost and assembly man-hours.

To achieve the above object, a driving circuit device according to the present invention drives a light-emitting element having an electrode lead. The driving circuit device comprises a circuit substrate and a transformer, wherein the transformer is disposed on the circuit substrate and has a clamping portion on one side of the transformer. The clamping portion is electrically connected to the transformer, and the electrode lead is clamped by the clamping portion.

In order to achieve the above object, a backlight module according to the present invention comprises a back plate, a driving circuit device and a light emitting element. The driving circuit device is disposed on one side of the backboard and has a circuit substrate and a transformer. The transformer is disposed on the circuit board and has a clamping portion electrically connected to the press on one side of the transformer. The light emitting element is disposed on the other side of the backing plate and has one electrode wire clamped by the clamping portion.

As described above, the driving circuit device and the backlight module of the present invention are provided with a clamping portion in the transformer to connect the electrode wires of the light-emitting element to the clamping portion and electrically connect them to each other. In this way, the high-voltage connecting line, the high-voltage connecting terminal and the like in the conventional technology are omitted, and the cost can be saved, and the number of machine components can be reduced, and the assembly man-hour can be saved at the same time. In addition, the electrode lead is directly connected to the clamping portion of the transformer, and it is also possible to avoid a flashover phenomenon caused by poor contact between the connection terminals.

Hereinafter, a driving circuit device and a backlight module according to a preferred embodiment of the present invention will be described with reference to the related drawings.

Please refer to FIG. 2 and FIG. 3 , wherein FIG. 3 is a cross-sectional view taken along line AA of FIG. 2 . The backlight module 2 of the preferred embodiment of the present invention comprises a backing plate 21, a driving circuit device 22 and a light-emitting element 23. In the embodiment, the backlight module 2 is exemplified by a direct type backlight module, and is applicable to a liquid crystal display device.

The driving circuit device 22 is disposed on one side of the back plate 21 and has a circuit substrate 221 and a transformer 222. The circuit board 221 can be a printed circuit board (PCB), which can be a single layer board, a double layer board or a multi-layer board. In addition, the transformer 222 can be a part of an inverter, and the transformer 222 outputs a driving signal to drive the light-emitting element 23 to emit light.

The transformer 222 is disposed on a surface of the circuit substrate 221 away from the back plate 21. As shown in FIG. 4, the transformer 222 has a clamping portion 2221, a bobbin 2222, at least one primary side coil 2223, and at least a secondary side coil 2224. The clamping portion 2221 is located on one side of the transformer 222 and is disposed in the bobbin 2222. The primary side coil 2223 and the secondary side coil 2224 are respectively wound around the bobbin 2222, and the clamping portion 2221 is adjacent to and electrically connected to the secondary side coil 2224. In addition, the clamping portion 2221 may be adjacent to the primary side coil 2223, and the installation position thereof is not limited thereto.

Referring to FIG. 2 and FIG. 3 again, the light-emitting element 23 is, for example, a cold cathode fluorescent tube or a hot cathode fluorescent tube, which is disposed on the second side of the back plate 21 in this embodiment. And arranged in parallel with the back plate 21. In this embodiment, the light-emitting element 23 has two electrode wires 231 for receiving the driving signals, and each of the electrode wires 231 has a bent portion 232, thereby changing the direction of the electrode wires 231, and the electrode wires 231 are self-contained with the light-emitting elements 23. The parallel state forms a state perpendicular to the light-emitting element 23 after the bent portion 232, and then extends through the first opening 211 of the back plate 21 and then extends into the transformer 222 disposed on the circuit substrate 221 . The clamping portion 2221 is clamped and fixed by the clamping portion 2221 and is electrically connected to the clamping portion 2221. Thus, the light-emitting element 23 reaches the requirement of electrical conduction with the transformer 222.

In this embodiment, the back plate 21 can be a metal back plate and has a reflective surface on the second side thereof to reflect the light emitted by the light-emitting element 23 for effective use. The reflective surface may be the back plate 21 itself or a reflective sheet, which is not limited herein.

In addition, in the embodiment, the circuit board 221 has at least one second opening 2211, and the clamping portion 2221 is disposed corresponding to the opening position of the second opening 2211, and is exposed to the second opening 2211. In addition, the clamping portion 2221 has at least one metal elastic piece for clamping and fixing the electrode lead 231 passing through the first opening 211 and the second opening 2211, and the electrode lead 231 is fixed by the metal elastic piece, and The secondary side coil 2224 produces an electrical connection. It is worth mentioning that, in this case, the metal dome is exemplified by a U-shaped metal dome. Of course, it may also be that the two pieces of the elastic piece jointly hold the electrode lead 231, or may be a single metal dome and the bobbin 2222. A part of the electrode lead 231 is clamped together, and is not limited thereto. The main purpose is that the clamping portion 2221 can sandwich the electrode lead 231 and be electrically connected to the secondary side coil 2224.

In addition, in the embodiment, the backlight module 2 further includes a fixing member 24, such as a rubber pad, which is respectively coupled to the back plate 21 and one end of the light emitting element 23 to support the light emitting element 23, and The position of the light-emitting element 23 in the backlight module 2 can be fixed.

In the above embodiment, the driving circuit device is exemplified by driving the light-emitting component in the backlight module. Of course, it can also be used to drive other loads, and is not limited to being applied to the backlight module.

In summary, the driving circuit device and the backlight module of the present invention are provided with a clamping portion in the transformer to connect the electrode wires of the light-emitting element to the clamping portion and electrically connect them to each other to avoid generation. A flashover caused by poor contact between the terminals. In addition, the high-voltage connecting line, the high-voltage connecting terminal and the like in the prior art can be omitted, and the material cost can be saved, and the number of machine components can be reduced, and the assembly man-hour can be saved at the same time.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

11. . . Light unit

111, 112. . . Electrode end

12. . . Cable

121. . . Connection terminal

13. . . Drive circuit device

131. . . Connection terminal

14. . . transformer

15. . . Rubber mat

2. . . Backlight module

twenty one. . . Backplane

211. . . First opening

twenty two. . . Drive circuit device

221. . . Circuit substrate

2211. . . Second opening

222. . . transformer

2221. . . Grip

2222. . . Winding frame

2223. . . Primary side coil

2224. . . Secondary side coil

twenty three. . . Light-emitting element

231. . . Electrode lead

232. . . Bending section

twenty four. . . Fastener

1 is a partial schematic view showing a conventional backlight module; FIG. 2 is a partial schematic view showing a backlight module according to a preferred embodiment of the present invention; FIG. 3 is a cross-sectional view showing a line AA in FIG. 2; A schematic diagram of a transformer in a backlight module in accordance with a preferred embodiment of the present invention is shown.

twenty one. . . Backplane

211. . . First opening

twenty two. . . Drive circuit device

221. . . Circuit substrate

2211. . . Second opening

222. . . transformer

2221. . . Grip

2222. . . Winding frame

twenty three. . . Light-emitting element

231. . . Electrode lead

232. . . Bending section

twenty four. . . Fastener

Claims (17)

a driving circuit device for driving a light-emitting element having an electrode lead, the driving circuit device comprising: a circuit substrate; and a transformer disposed on the circuit substrate, the transformer having a bobbin and the transformer One of the sides further has a clamping portion, and the clamping portion is disposed in the winding frame, wherein the clamping portion is electrically connected to the transformer, and the electrode wire is clamped by the clamping portion. The driving circuit device of claim 1, wherein the transformer further has a primary side coil and a primary side coil, respectively wound around the winding frame, and the clamping portion is connected to the secondary The side coils are electrically connected. The driving circuit device of claim 2, wherein the clamping portion is disposed adjacent to the secondary side coil or the primary side coil. The driving circuit device of claim 1, wherein the clamping portion has a metal dome that is coupled to the electrode lead and electrically connected. The driving circuit device of claim 1, wherein the circuit substrate has an opening through which the electrode wire passes and is clamped by the clamping portion. The driving circuit device of claim 5, wherein the opening position corresponds to the clamping portion. The driving circuit device of claim 1, wherein the electrode lead of the light emitting element has a bent portion. A backlight module includes: a backplane; a driving circuit device disposed on one side of the backplane, and having a circuit substrate and a transformer, wherein the transformer is disposed on the circuit substrate, the transformer has a winding And a clamping portion electrically connected to the transformer on one side of the transformer, the clamping portion is disposed in the winding frame; and a light emitting component is disposed on the other side of the backboard And having an electrode lead, and the electrode lead is clamped by the clamping portion. The backlight module of claim 8, wherein the transformer is disposed on a surface of the circuit substrate away from the backplane. The backlight module of claim 9, wherein the transformer further has a primary side coil and a primary side coil, respectively wound around the winding frame, and the clamping part is associated with the secondary The side coils are electrically connected. The backlight module of claim 10, wherein the clamping portion is disposed adjacent to the secondary side coil or the primary side coil. The backlight module of claim 8, wherein the clamping portion has at least one metal elastic piece that is assembled with the electrode lead and electrically connected. The backlight module of claim 8, wherein the light emitting element is a cold cathode fluorescent tube or a hot cathode fluorescent tube. The backlight module of claim 8, wherein the electrode lead of the light-emitting element has a bent portion. The backlight module of claim 8, wherein the back plate has a first opening, and the electrode wire passes through the first opening. The backlight module of claim 15, wherein the circuit substrate has a second opening, the second opening is located corresponding to the first opening, and the electrode wire is disposed through the wire The second opening. The backlight module of claim 16, wherein the position of the second opening corresponds to the clamping portion, and the electrode wire passes through the second opening and is clamped by the clamping portion.