CN101709843B - Backlight module - Google Patents

Abstract

The invention discloses a backlight module comprising a frame component, at least one light-emitting element and a flexible base plate, wherein the flexible base plate is provided with a first base plate part and a first stop part, wherein a part of the first stop part protrudes out of the base plate part; the light-emitting elements are electrically arranged at the rear of the base plate part; the flexible base plate carrying the light-emitting elements is arranged in the frame component; and the stop part is bent an angle on the base plate part for obstructing the frame component and the light-emitting elements.

Description

Backlight module

technical field

The invention relates to a backlight module, in particular to a backlight module with a barrier structure design of a flexible substrate.

Background technique

The backlight module of the known liquid crystal display is installed on the display panel to provide the light required by the liquid crystal display. In thinner models of notebook computers, in order to avoid the separation of the flexible board (FPC) between the circuit board and the battery (Cell) due to the vibration of the circuit board and the bottom, it is usually placed on the frame of the backlight module. A bracket is arranged on the upper welding, and the circuit board is fixed by using the metal structure strength of the bracket to avoid vibration of the circuit board.

However, the connection method between the carrier and the frame is firstly through a positioning and assembly method, a positioning hole is opened on the frame, and a positioning block is protruded from the carrier, and the positioning block of the carrier is pre-embedded in the jig inside of the pilot hole of the frame. Then, a welding process is used to weld the positioning block of the carrier into the positioning hole, so that the carrier is welded and arranged on the frame.

After the above-mentioned welding process, welding slag is likely to remain at the welded part of the frame and the carrier, especially on the inner surface of the frame, where more welding slag is accumulated. When the components of the backlight module (such as light-emitting diodes, flexible substrates or optical films, etc.) The welding slag on the inner surface of the frame peels off from the inner surface of the frame and falls on the components of the backlight module.

If welding slag falls on the contact of the LED, it will easily cause electrical conduction between the LED and the frame. In this way, when the current passes through the contact of the LED, the current will be directly conducted to the frame through the welding slag, resulting in a short circuit of the LED.

In addition, if there is too much solder on the joints of the light-emitting diode, it will also be in the process of assembling the components of the backlight module on the frame, because the excess solder (ie, welding slag) on the joints is affected by impact or friction. The solder peels off from the joints and falls between the components of the backlight module and the frame, which also causes a short circuit of the LEDs.

Contents of the invention

In view of the above problems, the technical problem to be solved by the present invention is to provide a backlight module, so as to solve the above-mentioned problem that welding slag easily falls between the components and the frame of the backlight module, resulting in a short circuit.

According to the disclosed backlight module of the present invention, it includes a frame, at least one light-emitting element and a flexible substrate. Wherein, the frame has a bearing surface, and has a side wall on one side of the frame, and the side wall is located on one side of the bearing surface. The light-emitting element is arranged inside the frame, and the light-emitting element has a body and an electrical connection portion, and the electrical connection portion protrudes outward from the body. The flexible substrate is arranged inside the frame and includes a substrate part and at least one first stopper part. The substrate part is located on the carrying surface, and the body of the light-emitting element is arranged on the substrate part, and the light-emitting element is electrically connected with the substrate part through the electrical connection part. The part of the first stop part protrudes from the substrate part, and an angle is formed between the first stop part and the substrate part, so that the first stop part is isolated between the side wall and the light-emitting element, and the second stop part The height of a stop part is greater than or equal to the height of the electrical connection part, and the substrate part further includes a first insulating layer and a circuit layer, and the circuit layer is arranged on the first insulating layer and mutually connected with the electrical connection part. Electrically connected, the part of the first insulating layer protrudes from the substrate part to form the first stopper part; the substrate part further includes a second insulating layer, and the circuit layer is arranged between the first insulating layer and the substrate part. Between the second insulating layer, a part of the second insulating layer protrudes outside the substrate portion to form a second stopper portion, and the second stopper portion is isolated between the side wall and the light-emitting element, And the first stopper part and the second stopper part cover the electrical connection part of the light emitting element.

Based on the structural design of the above-mentioned backlight module, since the first stopper with insulating properties is blocked between the side wall of the frame and the electrical connection of the light-emitting diode, the structural design of the above-mentioned backlight module can effectively prevent welding slag Dropping on the electrical connection part of the light-emitting element, so as to prevent the electrical connection between the frame and the light-emitting element caused by welding slag. In other words, the structural design of the above-mentioned backlight module can prevent the short circuit of the light-emitting element caused by welding slag conducting the frame to the light-emitting element.

Regarding the features, embodiments and effects of the present invention, the preferred embodiments are described in detail below in conjunction with the accompanying drawings.

Description of drawings

1A is a schematic side view of a backlight module according to a first embodiment of the present invention;

1B is a partially enlarged side schematic view of a backlight module according to a first embodiment of the present invention;

2A is a schematic side view of the flexible substrate according to the present invention with the circuit layer arranged on the first stopper part and the second stopper part;

2B is a schematic side view of a flexible substrate with a first insulating layer as a first stopper according to the present invention;

2C is a schematic side view of a flexible substrate with a second insulating layer as a second stopper according to the present invention;

2D is a schematic side view of the flexible substrate according to the present invention with the first insulating layer and the second insulating layer as the first stopper and the second stopper;

FIG. 2E is a schematic side view of the flexible substrate according to the present invention with the strengthening layer disposed on the first stopper part and the second stopper part;

3A and 3B are schematic diagrams showing the positional relationship between the substrate portion and the first stopper portion according to the present invention;

4A is a schematic side view of a backlight module according to a second embodiment of the present invention;

4B is a partially enlarged side schematic view of a backlight module according to a second embodiment of the present invention;

5A is a schematic side view of a backlight module according to a third embodiment of the present invention; and

5B is a partially enlarged side view of a backlight module according to a third embodiment of the present invention.

Among them, reference signs

100 backlight modules 10 frame pieces

11 bearing surface 12 side wall

121 connection holes 20 light-emitting elements

21 Body 22 Electrical connection part

30 Flexible substrate 31 Substrate part

311 first insulating layer 312 circuit layer

313 second insulation layer 32 first stopper

33 The second stopper 34 Reinforcing layer

35 bending lines 40 light guide elements

50 bracket 51 connecting part

60 circuit boards 70 display panels

A, B welding position θ included angle

Detailed ways

Please refer to Figure 1A to Figure 2A. Among them, FIG. 1A is a schematic side view of the backlight module according to the first embodiment of the present invention. FIG. 1B is a partially enlarged side view of the portion surrounded by a circle in the backlight module according to the first embodiment of the present invention. FIG. 2A is a schematic side view of a flexible substrate according to the present invention with a circuit layer disposed on a first stop portion and a second stop portion. According to the disclosed backlight module 100 of the present invention, it includes a frame 10 , at least one light emitting element 20 and a flexible substrate 30 .

The frame 10 can be made of a metal material (such as iron or aluminum), and the frame 10 has a bearing surface 11, which is used to load other components, such as the light emitting element 20, the flexible substrate 30 and the light guide Component 40 and other backlight module components. It should be understood that there are other components in the backlight module 100 , and their descriptions are omitted here because they are not related to the present invention. In addition, a side wall 12 is provided on at least one side of the frame member 10 , and the side wall 12 is erected on one side of the bearing surface 11 .

The light emitting element 20 can be a light emitting diode (Light Emitting Diode, LED), an electroluminescent element (Electro Luminescent, EL) or a cold cathode lamp (Cold Cathode Fluorescent Lamp, CCFL). The light emitting element 20 has a body 21 and an electrical connection portion 22 . The electrical connection portion 22 is disposed on one side of the body 21 and protrudes from the body 21 .

The flexible substrate 30 has a substrate portion 31 and at least one first stop portion 32 . The substrate portion 31 is disposed on the bearing surface 11 of the frame member 10, and the substrate portion 31 has at least a first insulating layer 311 and a circuit layer 312 (please refer to FIG. 2A together below), and the circuit layer 312 is disposed on the first on the insulating layer 311. It should be noted that a portion of the first insulating layer 311 protrudes from the substrate portion 31 to form the first stopper portion 32 .

In addition, the flexible substrate 30 further includes a second insulating layer 313 disposed on the circuit layer 312 . In other words, the wiring layer 312 is disposed between the first insulating layer 311 and the second insulating layer 313 . The first insulating layer 311 and the second insulating layer 313 can be made of an insulating plastic material, such as resin (Thermoplastic Polyurethane, TPU), polycarbonate resin (Polycarbonate, PC), silicone resin ( Silicone Plastics, SP) or polyethylene terephthalate (Polyethylene Terephthalate, PET), but not limited to this, only need to make the first insulating layer 311 and the second insulating layer 313 only needs to have the function of electrical insulation.

It is particularly worth noting that, in this embodiment, the flexible substrate 30 further includes at least one second stopper portion 33, which mainly protrudes a part of the second insulating layer 313 out of the substrate portion 31 to form a second stopper 33 . And the line layer 312 can be arranged between the first stopper 32 and the second stopper 33 (as shown in FIG. 1B and FIG. 2A ), and make the first stopper 32 and the second stopper 33 face each other. The base portion 31 is bent with an included angle θ.

Please refer to FIG. 1A again, which further includes a light guide element 40. The light guide element 40 can be a light guide panel or a light guide film. The light guide element 40 is disposed on the substrate portion 31 of the flexible substrate 30 and adjacent to a side of the light emitting element 20 . In detail, the light generated by the light emitting element 20 is irradiated toward the light guide element 40 , so that the light can enter the light guide element 40 for light reflection. It should be noted that one side of the light guide element 40 is opposite to a display panel 70 . In this embodiment, the display panel 70 can be a liquid crystal display panel, and the display panel 70 can be corresponding to the top of the light guide element 40 . After the light emitting element 20 injects light toward the light guide element 40 , the light can be uniformly projected onto the display panel 70 through the light guide element 40 .

Moreover, the backlight module 100 further includes a bracket 50 for accommodating a circuit board 60 , and is disposed on an outer surface of the side wall 12 of the frame member 10 . The bracket 50 has at least one connecting portion 51 protruding outward from one side of the bracket 50 , and the side wall 12 further has at least one connecting hole 121 at a position corresponding to the connecting portion 51 . When assembling, the bracket 50 is fixed inside the connecting hole 121 of the side wall 12 with the connecting portion 51. In this embodiment, the welding operation can be performed between the connecting portion 51 and the connecting hole 121, whereby the stored The bracket 50 of the circuit board 60 is welded on the side wall 12 .

In addition, the backlight module 100 further includes a power supply element (not shown), which forms an electrical connection with the circuit board 60 . The power supply element provides a power supply to the driver chip (not shown) of the circuit board 60 to drive the light-emitting element 20 to operate, which belongs to the known technology and will not be repeated here.

When assembling through the above-mentioned components, the body 21 of the light-emitting element 20 is disposed on the substrate portion 31 of the flexible substrate 30, and the electrical connection portion 22 of the light-emitting element 20 and the circuit layer 312 of the substrate portion 31 constitute each other. electrical connection. Next, one end of the flexible substrate 30 on which the light-emitting element 20 is loaded is assembled inside the frame member 10 , so that the substrate portion 31 of the flexible substrate 30 is located on the carrying surface 11 .

1A and FIG. 1B, since the first stopper portion 32 and the second stopper portion 33 protrude outside the base plate portion 31, when the base plate portion 31 is assembled inside the frame member 10, it can make The first stop portion 32 and the second stop portion 33 are bent at an angle along the surface of the side wall 12 . In this way, an included angle θ is formed between the first stopper portion 32 and the second stopper portion 33 and the substrate portion 31 , and the optimal angle of the included angle θ may be 90°. And make the first stopper 32 and the second stopper 33 be located between the side wall 12 and the light emitting element 20, and the height of the first stopper 32 and the second stopper 33 is relatively higher than the height of the light emitting element 20 The height of the electrical connection portion 22 is not limited thereto. The height of the first stopper 32 and the second stopper 33 can also be the same as the height of the electrical connection part 22 of the light-emitting element 20, only the first stopper 32 and the second stopper 33 can be shielded The electrical connection part 22 is enough. In this way, through the structural design of the bent first stopper part 32 and the second stopper part 33, the welding point of the side wall 12 (that is, the welding part A between the side wall 12 and the bracket 50) and the luminous The soldering point of the device 20 (ie, the soldering portion B between the electrical connection portion 22 and the circuit layer 312 ) forms a barrier structure. In this way, the residual welding slag on the welding portion A is prevented from falling between the side wall 12 and the electrical connection portion 22 , causing the light-emitting element 20 to be short-circuited.

It is particularly worth noting that, in this embodiment, parts of the first insulating layer 311 and the second insulating layer 313 protrude from the substrate portion 31, and may be formed with a first stopper portion 32 and a second stopper portion 33 respectively. , and a circuit layer 312 structure (as shown in FIG. 2A ) is disposed between the first stop portion 32 and the second stop portion 33 , but not limited thereto. It can also be a part of the first insulating layer 311 protruding out of the substrate portion 31 to form only the structure of the first stopper portion 32 (as shown in FIG. 2B ), and use the first stopper portion 32 as a barrier side wall 12 and the light-emitting element 20 , and the electrical connection portion 22 is covered by the first stopper portion 32 .

Or part of the second insulating layer 313 (which can be regarded as the same structure as the first insulating layer 311) protrudes outside the substrate portion 31, thereby forming the structure of the second stopper portion 33 (as shown in FIG. 2C ), The second stop portion 33 is used to isolate the side wall 12 from the light-emitting element 20 , and the second stop portion 33 is used to cover the electrical connection portion 22 .

Alternatively, portions of the first insulating layer 311 and the second insulating layer 313 protrude from the substrate portion 31 to respectively form the structures of the first stopper portion 32 and the second stopper portion 33 (as shown in FIG. 2D ). It should be noted that no circuit layer 312 is disposed between the first stop portion 32 and the second stop portion 33 .

In addition, as shown in FIG. 2E , the flexible substrate 30 further includes a reinforcement layer 34 . The reinforcement layer 34 is disposed between the first stopper portion 32 and the second stopper portion 33 , and the reinforcement layer 34 and the circuit layer 312 are separated by a distance and do not contact each other. The material of the reinforcement layer 34 is a hard material, for example, the material of the reinforcement layer 34 is metal. In this way, through the structural design of the reinforcing layer 34 between the first stopper 32 and the second stopper 33, the first stopper 32 and the second stopper 33 can be erected on the side wall 12 and the light emitting between elements 20. It should be noted that there is a distance between the reinforcing layer 34 and the circuit layer 312 , which can facilitate the bending of the first stop portion 32 and the second stop portion 33 at this distance.

Moreover, in order to make the bending angle of the first stop portion 32 more obvious, the above-mentioned flexible substrate 30 further has a bending line 35 (as shown in FIG. 3A or FIG. 3B ). between the base plate portion 31 and the first stop portion 32, so that the bending degree of the first stop portion 32 can be adjusted more easily through the bending line 35, so as to ensure that the base plate portion 31 and the first stop portion The angle θ formed between 32. It should be noted that the above-mentioned bending line 35 can also be interposed between the base plate portion 31 and the second stop portion 33 .

In addition, the first stop portion 32 can be a single-piece structure (as shown in FIG. 3A ). During bending, the first stop portion 32 can cover the light emitting elements 20 at the same time. Alternatively, the first stoppers 32 are designed as a plurality of sheet structures (as shown in FIG. 3B ), so that these first stoppers 32 are respectively arranged at intervals on one side of the base plate part 31, and each first Each stop portion 32 corresponds to a light-emitting element 20 , and the size of each first stop portion 32 can cover the electrical connection portion 22 of the corresponding light-emitting element 20 . During bending, the respective first stop portions 32 are used to block between the corresponding light-emitting elements 20 and the side walls 12 . It should be noted that the structure of the second stop portion 33 can also be designed as the structure of the first stop portion 32 in FIG. 3A or FIG. 3B .

Please refer to FIG. 4A and FIG. 4B , wherein FIG. 4A is a schematic side view of a backlight module according to a second embodiment of the present invention. 4B is a partially enlarged side view of a backlight module according to a second embodiment of the present invention.

In FIG. 4A and FIG. 4B, the angle between the first stop portion 32 and the substrate portion 31 is about 90°, so that the first stop portion 32 is blocked between the side wall 12 and the light emitting element 20, and The first stop portion 32 extends upwards to the position where the welding point of the side wall 12 is shielded (ie, the welding position A between the side wall 12 and the bracket 50 ). It should be noted that, the second stop portion 33 may form an included angle of approximately 90° with the base portion 31 and extend upwards to the position where the welding point of the side wall 12 is shielded.

Please refer to FIG. 5A and FIG. 5B , wherein FIG. 5A is a schematic side view of a backlight module according to a third embodiment of the present invention. 5B is a partially enlarged side view of a backlight module according to a third embodiment of the present invention.

In FIG. 5A and FIG. 5B , the angle between the first stop portion 32 and the substrate portion 31 is smaller than 90°, so that the first stop portion 32 covers the electrical connection portion 22 of the light emitting element 20 , And it is blocked between the side wall 12 and the light emitting element 20 . It should be noted that the second stop portion 33 can also form an included angle smaller than 90° with the substrate portion 31 and cover the electrical connection portion 22 of the light emitting element 20 .

To sum up, according to the backlight module of the above-mentioned embodiment, it can be seen that the backlight module protrudes from the substrate portion of the flexible substrate with an insulating first stopper portion, and the first stopper portion is placed on the substrate portion. An angle is bent so that the first stop part is blocked between the side wall of the frame and the electrical connection part of the light emitting element. To prevent the residual welding slag from the welding point of the side wall (that is, the welding part between the side wall and the bracket) from falling on the electrical connection part of the light-emitting element, so that the welding slag conducts the connection between the light-emitting element and the frame. Electrical connection, so as to reduce the occurrence of short circuit of the light emitting element.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (5)

1. A backlight module, characterized in that, comprising: A frame member has a bearing surface, one side of the frame member has a side wall, and the side wall is located on one side of the bearing surface; At least one light-emitting element is arranged inside the frame, the light-emitting element has a body and an electrical connection part, and the electrical connection part protrudes from the body to the outside of the body; and A flexible substrate is arranged inside the frame and includes a substrate portion and at least one first stopper portion, the substrate portion is located on the carrying surface and the body is configured on the substrate portion, the electrical connection The part is electrically arranged on the substrate part, the part of the first stopper protrudes from the substrate part, and an angle is formed between the first stopper part and the substrate part, so that the first stopper part isolated between the side wall and the light-emitting element, and the height of the first stop part is greater than or equal to the height of the electrical connection part; The substrate portion includes a first insulating layer and a circuit layer, the circuit layer is disposed on the first insulating layer and is electrically connected to the electrical connection portion, a part of the first insulating layer protrudes from the substrate portion outside to form the first stop; The substrate portion further includes a second insulating layer, the wiring layer is disposed between the first insulating layer and the second insulating layer, and a part of the second insulating layer protrudes from the substrate portion to form a second insulating layer. The stopper part, the second stopper part is isolated between the side wall and the light emitting element, and the first stopper part and the second stopper part cover the electrical connection part of the light emitting element. 2. The backlight module according to claim 1, further comprising a light guide element disposed on the substrate portion and adjacent to the light emitting element. 3. The backlight module according to claim 2, wherein the light guide element is a light guide plate or a light guide film. 4. The backlight module according to claim 1, further comprising a bracket for accommodating a circuit board, the bracket has at least one connecting portion, and the side wall has at least one A connecting hole, the bracket is assembled in the connecting hole of the side wall by the connecting portion. 5 . The backlight module according to claim 1 , wherein the backlight module further comprises a plurality of the first stoppers, and each stopper is arranged at intervals on one side of the substrate. 5 .

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