Connecting structure of double-backlight FPC (Flexible Printed Circuit)

Abstract

The utility model relates to the technical field of display screens, in particular to a connecting structure of a double-backlight FPC (Flexible Printed Circuit). A positive electrode and a negative electrode on the backlight FPC soft board can be independent and far away from each other, staggered welding of the positive electrode and the negative electrode can be achieved, welding convenience is improved, and meanwhile the accident of short circuit between the positive electrode and the negative electrode is effectively reduced; and in a limited space, the width and thickness design quantities of the anode and cathode circuits are improved, larger current can be borne, and the power supply reliability is effectively improved. Comprising a screen which comprises a glass plate and a backlight assembly integrally connected with the glass plate; the main FPC soft board is located at the bottom of the screen, and the main FPC soft board is electrically connected with the screen; one end of the backlight FPC soft board positive electrode belt and one end of the backlight FPC soft board negative electrode belt are arranged in parallel and are connected with the main FPC soft board, and gaps exist between the backlight FPC soft board positive electrode belt and the main FPC soft board connecting end and between the backlight FPC soft board negative electrode belt and the main FPC soft board connecting end.

Description

Technical Field

[0001] The utility model relates to the technical field of display screens, in particular to a connection structure of a double-backlight FPC. Background Art

[0002] The display screen is connected to the main board through the main FPC board. The main FPC board plays an important connecting role between the display screen and the main board, and the connection reliability of the main FPC board is directly related to the overall quality of the product. The backlight component in the display screen is connected to the main FPC board through the backlight FPC board. The current backlight FPC boards mostly adopt a compact integrated design with positive and negative poles in parallel.

[0003] For example, a Chinese utility model patent discloses a backlight FPC (publication (announcement) number CN217217025U), including a main body FPC and a backlight FPC welded on the main body FPC, wherein a No. 1 reinforcement mechanism is provided at one end of the top of the backlight FPC, and a No. 2 reinforcement mechanism is provided on one side of the top of the main body FPC, wherein the soldering pad of the backlight FPC is circular in design, and a through hole is left in the middle of the circular soldering pad, during soldering, the solder ball passes through the hole to solder the main body FPC and the backlight FPC together, and a horizontal strip-shaped NC soldering pad is designed at the bottom of the backlight FPC, which is used as a fixed foot for soldering, and plays a role in reinforcing and preventing tearing, and the soldering pad of the main body FPC is also designed accordingly, so as to realize the reinforcement of the soldering point of the backlight FPC, improve the tensile strength of the soldering point, improve the stability, and solve the problem in the prior art that the rectangular soldering pad is prone to cold soldering during welding, thereby causing poor electrical connection.

[0004] However, when the inventors implemented this device, they found the following defects: the positive and negative electrodes on the backlight FPC board were too close, which could easily cause a short circuit between the positive and negative electrodes during welding; the width and thickness of the backlight FPC board with a compact and parallel integrated design of the positive and negative electrodes were limited, and had certain limitations in use. Utility Model Content

[0005] Based on this, it is necessary to provide a dual backlight FPC connection structure to address the above technical problems, so that the positive and negative electrodes on the backlight FPC soft board are independent and away from each other, and the staggered welding of the positive and negative electrodes can be realized, which improves the convenience of welding and effectively reduces the occurrence of short circuit accidents between the positive and negative electrodes; in a limited space, the width and thickness design of the positive and negative circuits are increased to withstand larger currents, effectively improving the power supply reliability.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A dual-backlight FPC connection structure is used for circuit connection between a screen backlight component and a main FPC soft board.

[0008] The connection structure of the dual backlight FPC specifically includes:

[0009] A screen, comprising a glass plate and a backlight assembly integrally connected to the glass plate;

[0010] A main FPC soft board, the main FPC soft board is located at the bottom of the screen, and the main FPC soft board is electrically connected to the screen;

[0011] A backlight FPC soft board positive electrode belt and a backlight FPC soft board negative electrode belt, one end of the backlight FPC soft board positive electrode belt and the backlight FPC soft board negative electrode belt are arranged in parallel and connected to the main FPC soft board, and there is a gap between the backlight FPC soft board positive electrode belt and the backlight FPC soft board negative electrode belt and the main FPC soft board connection end; the other ends of the backlight FPC soft board negative electrode belt and the backlight FPC soft board positive electrode belt are stacked up and down and connected to the backlight assembly.

[0012] As a preferred implementation of the dual backlight FPC connection structure provided by the utility model, the gap between the positive and negative strips of the backlight FPC soft board and the connection ends of the main FPC soft board is 4mm-8mm.

[0013] As a preferred embodiment of the connection structure of the dual backlight FPC provided by the utility model, the outer wall of one end of the positive electrode belt of the backlight FPC soft board and the negative electrode belt of the backlight FPC soft board close to the backlight component is covered with an insulating layer; further, the insulating layer can be a soft plastic layer, or other insulating layers with equivalent insulating effects such as a silicone layer; insulating paper or an insulating pad can also be arranged between the positive electrode belt of the backlight FPC soft board and the negative electrode belt of the backlight FPC soft board.

[0014] As a preferred implementation of the dual backlight FPC connection structure provided by the utility model, welding terminals are provided on the positive electrode band and the negative electrode band of the backlight FPC soft board, and strip grooves matching the welding terminals are provided on the main FPC soft board, and the welding terminals are inserted into the strip grooves.

[0015] As a preferred implementation of the dual backlight FPC connection structure provided by the utility model, arc-shaped positioning grooves are provided on the positive electrode belt and the negative electrode belt of the backlight FPC soft board, and the arc-shaped positioning grooves are semicircular grooves.

[0016] As a preferred implementation of the connection structure of the dual-backlight FPC provided by the utility model, a clamping protrusion ring is provided on the welding terminal, and a socket that fits with the clamping protrusion ring is provided in the strip groove.

[0017] As a preferred implementation of the connection structure of the dual-backlight FPC provided by the utility model, the outer diameter of the clamping raised ring is 0.5-1.5 mm larger than the outer diameter of the welding terminal.

[0018] As a preferred implementation of the dual-backlight FPC connection structure provided by the utility model, the inner diameter of the insertion hole is 0.1-0.3 mm smaller than the outer diameter of the retaining raised ring.

[0019] As a preferred implementation of the dual-backlight FPC connection structure provided by the utility model, the four groups of sockets are provided with a plurality of tearing openings extending radially outwardly along the sockets.

[0020] As a preferred implementation of the dual-backlight FPC connection structure provided by the utility model, a groove ring is provided on the clamping protrusion ring adjacent to one end of the main FPC soft board.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model provides a dual backlight FPC connection structure, which realizes the circuit connection between the backlight component and the main FPC soft board through two independent FPC connection belts, namely the positive belt of the backlight FPC soft board and the negative belt of the backlight FPC soft board, and the connection ends of the backlight component with the positive belt of the backlight FPC soft board and the negative belt of the backlight FPC soft board are designed in upper and lower layers, while the positive belt of the backlight FPC soft board and the negative belt of the backlight FPC soft board are arranged in parallel and separately with the connection ends of the main FPC soft board, so that the positive and negative electrodes on the backlight FPC soft board are independent and away from each other, and staggered welding of the positive and negative electrodes can be realized, which improves the convenience of welding and effectively reduces the occurrence of short circuit accidents between the positive and negative electrodes; in a limited space, the width and thickness design of the positive and negative circuits are increased, so that a larger current can be withstood, and the power supply reliability is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic plan view of the connection structure of the backlight assembly, the main FPC soft board, the positive electrode belt of the backlight FPC soft board and the negative electrode belt of the backlight FPC soft board provided by the utility model;

[0025] Figure 2 A schematic diagram of the three-dimensional structure of the main FPC soft board provided by the utility model;

[0026] Figure 3 A three-dimensional structural schematic diagram of the connection structure between the main FPC soft board and the positive electrode belt of the backlight FPC soft board and the negative electrode belt of the backlight FPC soft board provided by the utility model;

[0027] Figure 4 A schematic diagram of the back plane structure of the main FPC soft board and the positive electrode belt of the backlight FPC soft board and the negative electrode belt of the backlight FPC soft board are connected;

[0028] Figure 5 For this utility model Figure 4 Schematic diagram of the cross-section structure at AA in the middle;

[0029] Figure 6 for Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0030] Figure 7 for Figure 2 A schematic diagram of the partially enlarged structure at B in the middle;

[0031] Figure 8 for Figure 3 A schematic diagram of the partially enlarged structure at C in the middle;

[0032] Fig. 9 for Figure 4 The schematic diagram of the local enlarged structure at D in the middle;

[0033] Fig.10 for Figure 5 Schematic diagram of the local enlarged structure at point E in the middle.

[0034] The markings in the figure are as follows: 1. Glass plate; 2. Backlight assembly; 3. Main FPC soft board; 4. Positive strip of backlight FPC soft board; 5. Negative strip of backlight FPC soft board; 6. Welding terminal; 7. Strip groove; 8. Arc-shaped positioning groove; 9. Holding raised circle; 10. Socket; 11. Tear; 12. Bevel ring. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0036] A backlight FPC as described in the background technology; the positive and negative electrodes on the backlight FPC are too close, which can easily cause a short circuit between the positive and negative electrodes during welding; the width and thickness of the backlight FPC with a compact integrated design of parallel positive and negative electrodes are limited, and there are certain limitations on its use.

[0037] In order to solve this technical problem, the utility model provides a dual-backlight FPC connection structure, which is applied to the circuit connection between the screen backlight component and the main FPC soft board.

[0038] Specifically, please refer to Figure 1-10 The connection structure of the dual backlight FPC specifically includes: a screen, the screen includes a glass plate 1 and a backlight assembly 2 integrally connected to the glass plate 1; a main FPC soft board 3, the main FPC soft board 3 is located at the bottom of the screen, and the main FPC soft board 3 is electrically connected to the screen; a backlight FPC soft board positive electrode belt 4 and a backlight FPC soft board negative electrode belt 5, one end of the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5 are arranged in parallel and connected to the main FPC soft board 3, and ... There is a gap between the connection end of the backlight FPC soft board tape 4 and the negative electrode tape 5 of the backlight FPC soft board and the main FPC soft board 3; the other ends of the backlight FPC soft board negative electrode tape 5 and the backlight FPC soft board positive electrode tape 4 are stacked up and down and connected to the backlight assembly 2; the backlight FPC soft board positive electrode tape 4 and the backlight FPC soft board negative electrode tape 5 are welded and connected to the backlight assembly 2 or plugged in through an electrical connector, and the backlight FPC soft board positive electrode tape 4 and the backlight FPC soft board negative electrode tape 5 are welded to the main FPC soft board 3 by soldering.

[0039] The dual backlight FPC connection structure provided by the utility model realizes the circuit connection between the backlight component 2 and the main FPC soft board 3 through two independent FPC connecting belts, namely the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5. The connection ends of the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5 with the backlight component 2 adopt an upper and lower layered design, and the connection ends of the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5 with the main FPC soft board 3 are arranged side by side in parallel and separately, so that the positive and negative electrodes on the backlight FPC soft board are independent and away from each other, and staggered welding of the positive and negative electrodes can be realized, which improves the welding convenience and effectively reduces the occurrence of short circuit accidents between the positive and negative electrodes; in a limited space, the width and thickness design of the positive and negative circuits are increased, which can withstand larger currents and effectively improve the power supply reliability.

[0040] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] Example 1

[0044] Please refer to Figure 1-5 , a connection structure of dual backlight FPC, screen, the screen includes a glass plate 1 and a backlight assembly 2 integrally connected to the glass plate 1; a main FPC soft board 3, the main FPC soft board 3 is located at the bottom of the screen, and the main FPC soft board 3 is electrically connected to the screen; a backlight FPC soft board positive electrode belt 4 and a backlight FPC soft board negative electrode belt 5, one end of the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5 are arranged in parallel and connected to the main FPC soft board 3, and there is a gap between the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5 and the main FPC soft board 3 connection end; the gap between the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5 and the main FPC soft board 3 connection end is 4mm-8mm; the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5 are arranged in parallel and connected to the main FPC soft board 3. The outer wall of one end of the negative electrode tape 5 close to the backlight assembly 2 is coated with an insulating layer (not shown in the figure); further, the insulating layer can be a soft plastic layer, or a silicone layer or other insulating layer with equivalent insulating effect, or an insulating material can be electroplated; insulating paper or an insulating pad can also be provided between the positive electrode tape 4 of the backlight FPC soft board and the negative electrode tape 5 of the backlight FPC soft board; when the positive electrode tape 4 of the backlight FPC soft board and the negative electrode tape 5 of the backlight FPC soft board are welded and connected to the main FPC soft board 3, one of them is first welded and connected to the main FPC soft board 3, and then the remaining one is connected to the main FPC soft board 3 to achieve staggered welding. If solder outflow occurs, it can be discovered and processed in time to avoid short circuit between the positive electrode tape 4 of the backlight FPC soft board and the negative electrode tape 5 of the backlight FPC soft board.

[0045] The connection structure of the dual backlight FPC provided in this embodiment has a 4mm-8mm gap between the positive electrode tape 4 of the backlight FPC soft board and the negative electrode tape 5 of the backlight FPC soft board and the connection end of the main FPC soft board 3, which can leave enough space for the flow of solder and effectively avoid a short circuit between the positive electrode tape 4 of the backlight FPC soft board and the negative electrode tape 5 of the backlight FPC soft board; and the insulating layer can insulate and isolate the positive electrode tape 4 of the backlight FPC soft board and the negative electrode tape 5 of the backlight FPC soft board near the backlight assembly 2 from each other to prevent a short circuit.

[0046] Example 2

[0047] The connection structure of the dual backlight FPC provided in Example 1 is further optimized. Specifically, Figure 8 As shown, welding terminals 6 are provided on the backlight FPC soft board positive electrode band 4 and the backlight FPC soft board negative electrode band 5, and a strip groove 7 matching with the welding terminal 6 is provided on the main FPC soft board 3, and the welding terminal 6 is inserted into the strip groove 7; further, the welding terminal 6 is riveted or welded to the backlight FPC soft board positive electrode band 4 and the backlight FPC soft board negative electrode band 5 as a whole.

[0048] The connection structure of the dual backlight FPC provided in this embodiment inserts the welding terminal 6 into the strip groove 7, and injects the molten solder into the strip groove 7. After the solder cools down, the welding terminal 6 is stably and firmly installed in the strip groove 7, thereby improving the connection stability between the main FPC soft board 3 and the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5; at the same time, the strip groove 7 can limit the molten solder to prevent the molten solder from flowing around, thereby ensuring the welding quality and further preventing a short circuit between the backlight FPC soft board positive electrode belt 4 and the backlight FPC soft board negative electrode belt 5 due to the solder.

[0049] Example 3

[0050] The connection structure of the dual backlight FPC provided in Example 2 is further optimized. Specifically, Figure 6 As shown in FIG8 , both the positive electrode belt 4 and the negative electrode belt 5 of the backlight FPC soft board are provided with an arc-shaped positioning groove 8 , and the arc-shaped positioning groove 8 is a semicircular groove.

[0051] The connection structure of the dual-backlight FPC provided in this embodiment can place the end of the solder gun in the arc-shaped positioning groove 8. The arc-shaped positioning groove 8 can effectively limit the end of the solder gun, improve the accuracy of solder feeding by the solder gun, avoid solder dripping everywhere due to unstable grip of the operator, and further ensure the welding quality.

[0052] Specifically, a retaining protrusion ring 9 is provided on the welding terminal 6, and a socket 10 that fits with the retaining protrusion ring 9 is provided in the strip groove 7; by passing the welding terminal 6 through the socket 10 and the retaining protrusion ring 9 is engaged with the socket 10, the connection stability between the welding terminal 6 and the main FPC soft board 3 can be effectively improved, and the positive electrode band 4 and the negative electrode band 5 of the backlight FPC soft board are prevented from shifting by themselves when the main FPC soft board 3 and the backlight FPC soft board positive electrode band 4 and the backlight FPC soft board negative electrode band 5 are welded and connected. While improving the welding accuracy, it further prevents the backlight FPC soft board positive electrode band 4 and the backlight FPC soft board negative electrode band 5 from contacting each other, so as to reduce the incidence of short circuit accidents.

[0053] Specifically, the outer diameter of the retaining protrusion ring 9 is 0.5-1.5 mm larger than the outer diameter of the welding terminal 6; the inner diameter of the socket 10 is 0.1-0.3 mm smaller than the outer diameter of the retaining protrusion ring 9; the above arrangement allows the retaining protrusion ring 9 to engage with the socket 10 after passing through the socket 10, thereby preventing the retaining protrusion ring 9 from detaching from the socket 10.

[0054] Specifically, the four groups of sockets 10 are provided with a plurality of tearing holes 11 extending radially outwardly along the sockets 10; the tearing holes 11 can facilitate the clamping raised ring 9 to pass through the sockets 10, and then the clamping raised ring 9 can be bonded and closed through the tearing holes 11 by soldering to prevent the clamping raised ring 9 from detaching from the tearing holes 11.

[0055] Specifically, a groove ring 12 is provided on the clamping protrusion ring 9 at one end adjacent to the main FPC soft board 3 ; the groove ring 12 can further improve the convenience and smoothness of inserting the clamping protrusion ring 9 into the insertion hole 10 .

[0056] The use process of the dual backlight FPC connection structure provided by the utility model is as follows: first, the main FPC soft board 3 is connected to the screen as a whole, and the positive electrode belt 4 of the backlight FPC soft board and one end of the negative electrode belt 5 of the backlight FPC soft board are overlapped up and down and then electrically plugged and connected with the backlight component 2, and the welding terminal 6 on the other end of the positive electrode belt 4 of the backlight FPC soft board is inserted into the socket 10 in the corresponding strip groove 7, and the molten solder is injected into the strip groove 7 to connect the positive electrode belt 4 of the backlight FPC soft board with the main FPC soft board 3 as a whole, and then the welding terminal 6 on the negative electrode belt 5 of the backlight FPC soft board is inserted into the corresponding socket 10 in the strip groove 7, and soldering can be performed according to the above principle.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A connection structure of a dual backlight FPC, characterized in that: It includes: A screen, comprising a glass plate (1) and a backlight assembly (2) integrally connected to the glass plate (1); A main FPC soft board (3), the main FPC soft board (3) being located at the bottom of the screen, and the main FPC soft board (3) being electrically connected to the screen; A backlight FPC soft board positive electrode tape (4) and a backlight FPC soft board negative electrode tape (5), one end of the backlight FPC soft board positive electrode tape (4) and the backlight FPC soft board negative electrode tape (5) are arranged in parallel and connected to a main FPC soft board (3), and a gap exists between the connection ends of the backlight FPC soft board positive electrode tape (4) and the backlight FPC soft board negative electrode tape (5) and the main FPC soft board (3); the other ends of the backlight FPC soft board negative electrode tape (5) and the backlight FPC soft board positive electrode tape (4) are arranged in a stacked manner and connected to a backlight assembly (2).

2. The connection structure of the dual backlight FPC according to claim 1, characterized in that: The gap between the connection ends of the backlight FPC soft board positive electrode strip (4) and the backlight FPC soft board negative electrode strip (5) and the main FPC soft board (3) is 4 mm to 8 mm.

3. The connection structure of the dual backlight FPC according to claim 2, characterized in that: The outer walls of one end of the backlight FPC soft board positive electrode strip (4) and the backlight FPC soft board negative electrode strip (5) close to the backlight assembly (2) are coated with an insulating layer.

4. The connection structure of the dual backlight FPC according to claim 1, characterized in that: The positive electrode strip (4) of the backlight FPC soft board and the negative electrode strip (5) of the backlight FPC soft board are both provided with welding terminals (6), and the main FPC soft board (3) is provided with strip grooves (7) that fit with the welding terminals (6), and the welding terminals (6) are inserted into the strip grooves (7).

5. The connection structure of the dual backlight FPC according to claim 4, characterized in that: The backlight FPC soft board positive electrode strip (4) and the backlight FPC soft board negative electrode strip (5) are both provided with arc-shaped positioning grooves (8), and the arc-shaped positioning grooves (8) are semicircular grooves.

6. The connection structure of the dual backlight FPC according to claim 5, characterized in that: The welding terminal (6) is provided with a retaining protrusion ring (9), and the strip-shaped groove (7) is provided with a plug hole (10) that fits with the retaining protrusion ring (9).

7. The connection structure of the dual backlight FPC according to claim 6, characterized in that: The outer diameter of the retaining raised ring (9) is 0.5-1.5 mm greater than the outer diameter of the welding terminal (6).

8. The connection structure of the dual backlight FPC according to claim 7, characterized in that: The inner diameter of the insertion hole (10) is 0.1-0.3 mm smaller than the outer diameter of the retaining raised ring (9).

9. The connection structure of the dual backlight FPC according to claim 6, characterized in that: The four groups of insertion holes (10) are provided with a plurality of tearing openings (11) extending radially outwardly along the insertion holes (10).

10. The connection structure of the dual backlight FPC according to claim 9, characterized in that: A groove ring (12) is provided on the clamping protrusion ring (9) at one end adjacent to the main FPC soft board (3).

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