FPC (Flexible Printed Circuit) and PCB (Printed Circuit Board) combined liquid crystal display module

Abstract

The utility model relates to the field of liquid crystal display, in particular to an FPC (flexible printed circuit) and PCB (printed circuit board) combined liquid crystal display module which comprises an LCD, a backlight and a PCB which are stacked, the LCD and the backlight are provided with FPCs, and a gap is at least formed between the bottoms of the backlight and the PCB; the FPC is at least formed by sequentially connecting a first connecting end, a first middle section, a second middle section and a second connecting end in the direction from the LCD to the PCB, the first connecting end is used for being welded to the LCD or the backlight, the first middle section is in a bent shape used for bypassing the bottom edge of the backlight, the second connecting end is used for being welded to the PCB, and the second middle section is used for being embedded into the gap. According to the utility model, the gap is formed at the bottoms of the backlight and the PCB, then the first middle section bypasses the backlight, and finally the second middle section is embedded in the gap, so that on one hand, the gap can be utilized to protect the second middle section, and on the other hand, the second connecting end can be directly adhered to the front part of the PCB, thereby avoiding punching the PCB.

Description

Technical Field

[0001] The utility model relates to the field of liquid crystal display, in particular to a liquid crystal display module combining an FPC and a PCB. Background Art

[0002] Flexible printed circuit board (FPC) is a highly reliable and extremely flexible printed circuit board made of polyimide or polyester film as the substrate. FPC is also called soft circuit board or flexible circuit board. It is favored for its excellent properties such as light weight, thin thickness, and free bending and folding. Generally speaking, the FPC of electronic products needs to be bent to the back of the display screen for fixation or there is a certain height difference in the application scenario of the FPC. For example, in the prior art, such as the Chinese patent document with publication number CN216901204U, a liquid crystal display module that resists FPC stress rebound is provided.

[0003] The specific FPC bending installation method is as follows Figure 1 and Figure 2 As shown, the liquid crystal display module in the prior art is mainly composed of LCD1, backlight 2 and PCB3. LCD1 is bound with FPC4 and driver IC11, and backlight 2 is also provided with FPC4 outlet wires. FPC4 of LCD1 and FPC4 of backlight 2 are both passed through the through holes provided on PCB3 and welded to the back of PCB3. This solution will make FPC4 of both exposed to the air, which is easy to cause problems such as wear or scratches of foreign objects on FPC4 of backlight 2 and FPC4 of LCD1. Utility Model Content

[0004] Based on this, it is necessary to provide a liquid crystal display module combining FPC and PCB to address the above technical problems.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A liquid crystal display module combining FPC and PCB, comprising a stacked LCD, a backlight and a PCB, wherein both the LCD and the backlight are provided with FPC, and a gap is formed between the backlight and the PCB at least at the bottom thereof;

[0007] Along the direction from LCD to PCB, the FPC is composed of at least a first connecting end, a first middle section, a second middle section and a second connecting end connected in sequence, the first connecting end is used for welding with the LCD or backlight, the first middle section is in a bent shape for bypassing the bottom edge of the backlight, the second connecting end is used for welding with the PCB, and the second middle section is used to be embedded in the gap.

[0008] Furthermore, the backlight and the PCB are fixedly connected via a connecting layer, and the thickness of the connecting layer is greater than the thickness of the FPC.

[0009] Furthermore, the connection layer is double-sided adhesive, and a gap is reserved on the double-sided adhesive to avoid the FPC.

[0010] Furthermore, the LCD includes an upper polarizer, an upper glass, a lower glass and a lower polarizer which are stacked;

[0011] The bottom edge of the lower glass is connected to the first connecting end through a driving IC.

[0012] Furthermore, a guide groove for accommodating the FPC is provided on a side of the backlight close to the PCB.

[0013] Furthermore, a side of the guide groove close to the backlight is provided with a wavy surface, and the wavy surface is connected to a side of the backlight close to the guide groove through an adhesive layer.

[0014] Furthermore, all sides of the guide groove close to the FPC are provided with glue-blocking strips.

[0015] Furthermore, the rubber-blocking pressure strip is a rubber strip.

[0016] Furthermore, a clamp is provided on one side of the guide groove close to the PCB;

[0017] A corresponding position on the PCB is provided with a slot for mounting the staples.

[0018] Furthermore, the staple is a columnar structure made of elastic plastic, a V-shaped notch is provided on one end of the columnar structure close to the PCB, barbs are provided on both sides of the arc surface of the V-shaped notch, and a horizontal bar facing the center of the V-shaped notch is connected between the two sides of the slot.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model first forms a gap at the bottom of the backlight and the PCB, then makes the first middle section bypass the backlight, and finally embeds the second middle section in the gap. In this way, on the one hand, the gap can be used to protect the second middle section, and on the other hand, the second connection end can be directly attached to the front of the PCB, thereby avoiding punching of the PCB. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a liquid crystal display module in the prior art;

[0022] Figure 2 It is a side view of a liquid crystal display module in the prior art;

[0023] Figure 3 It is a front view of the liquid crystal display module in the utility model;

[0024] Figure 4 It is a side view of the liquid crystal display module of the present utility model;

[0025] Figure 5 for Figure 4 A partial enlarged view of the AA in the middle;

[0026] Figure 6 This is a bottom view of the liquid crystal display module of the present utility model;

[0027] Figure 7 for Figure 6 A partial enlarged view of B in the middle;

[0028] Figure 8 It is a schematic diagram of the installation of the cross bar on the card slot in the utility model.

[0029] The markings in the figure are as follows:

[0030] 1. LCD; 2. Backlight; 3. PCB; 4. FPC; 41. First connecting end; 42. First middle section; 43. Second middle section; 44. Second connecting end; 5. Gap; 6. Double-sided adhesive; 7. Upper polarizer; 8. Upper glass; 9. Lower glass; 10. Lower polarizer; 11. Driver IC; 12. Guide groove; 13. Corrugated surface; 14. Adhesive layer; 15. Glue-blocking strip; 16. Pin; 17. Slot; 18. V-shaped notch; 19. Barb; 20. Cross bar. DETAILED DESCRIPTION

[0031] 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.

[0032] In the description of the present utility model, the English abbreviations and phrases used have definite Chinese meanings. The English abbreviations and phrases without annotations or explanations are technical terms well known to those skilled in the art. The English abbreviations and phrases with other meanings are annotated in Chinese as follows:

[0033] FPC is the abbreviation of Flexible Printed Circuit, which is translated into Chinese as: flexible printed circuit.

[0034] LCD is the abbreviation of Liquid Crystal Display, which is translated into Chinese as: liquid crystal display.

[0035] PBC is the abbreviation of Printed Circuit Board, which is translated into Chinese as: printed circuit board, also known as printed circuit board.

[0036] As in the background art, the FPC of LCD and the FPC of backlight are exposed on the back side of PCB and are easily damaged.

[0037] In order to solve this technical problem, the utility model provides a liquid crystal display module combining an FPC and a PCB.

[0038] Specifically, please refer to Figure 3-Figure 8 The liquid crystal display module in which FPC and PCB are combined includes a stacked LCD1, a backlight 2 and a PCB3, both LCD1 and the backlight 2 are provided with FPC4, and a gap 5 is formed between the backlight 2 and the PCB3 at least at their bottoms; along the direction from LCD1 to PCB3, the FPC4 is at least composed of a first connecting end 41, a first middle section 42, a second middle section 43 and a second connecting end 44 connected in sequence, the first connecting end 41 is used for welding with the LCD1 or the backlight 2, the first middle section 42 is in a bent shape for bypassing the bottom edge of the backlight 2, the second connecting end 44 is used for welding with the PCB3, and the second middle section 43 is used for embedding into the gap 5.

[0039] The utility model first forms a gap 5 through the bottom of the backlight 2 and the PCB 3, then makes the first middle section 42 bypass the backlight 2, and finally embeds the second middle section 43 in the gap 5. In this way, on the one hand, the gap 5 can be used to protect the second middle section 43, and on the other hand, the second connection end 44 can be directly attached to the front of the PCB 3, thereby avoiding punching of the PCB 3.

[0040] 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 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 3-Figure 8The liquid crystal display module combined with FPC and PCB includes LCD1, backlight 2 and PCB3 which are stacked. Therefore, the liquid crystal display module is generally placed horizontally for viewing. Therefore, in the following text, the direction close to the viewer is set as the front, and the direction opposite to the viewer is set as the back; therefore, the stacking arrangement of the three means that the back of LCD1 is fixed to the front of the backlight 2, and the back of the backlight 2 is fixed to the front of the PCB3; the three can be connected by gluing or by using a connector.

[0045] LCD1 and backlight 2 are both provided with FPC4, where FPC4 is used to provide circuits to LCD1 and backlight 2, and therefore, FPC4 is electrically connected to the bottom ends of the front parts of LCD1 and backlight 2; backlight 2 and PCB3 form a gap 5 at least between their bottoms, where backlight 2 and PCB3 can be connected by a connector or in any other manner, and it is only necessary to make the bottom ends of backlight 2 and PCB3 have a gap; along the direction from LCD1 to PCB3, FPC4 is composed of at least a first connecting end 41, a first middle section 42, a second middle section 43 and a second connecting end 44 connected in sequence, the first connecting end 41 is used to be welded to LCD1 or backlight 2, the first middle section 42 is in a bent shape for bypassing the bottom edge of the backlight 2, the second connecting end 44 is used to be welded to PCB3, and the second middle section 43 is used to be embedded in the gap 5.

[0046] The utility model first forms a gap 5 at the bottom of the backlight 2 and the PCB 3, then makes the first middle section 42 bypass the backlight 2, and finally embeds the second middle section 43 in the gap 5. In this way, on the one hand, the gap 5 can be used to protect the second middle section 43, and on the other hand, the second connection end 44 can be directly attached to the front of the PCB 3, thereby avoiding punching of the PCB 3.

[0047] Example 2

[0048] The liquid crystal display module combined with FPC and PCB provided in Example 1 is further optimized, and the backlight 2 and PCB3 are fixedly connected by a connecting layer, and the thickness of the connecting layer is greater than the thickness of FPC4. The connecting layer can be a connecting layer formed by adhesive. Here, the advantage of the connecting layer is that it is easy to process, and it can be applied by machine or manually, and then pressed. Moreover, the connecting layer itself has a certain thickness, and the thickness can be naturally reserved. There is no need to deliberately control the thickness. It is only necessary to control the thickness of the applied adhesive layer. The method of applying the adhesive layer is also convenient for reserving a gap for placing the double-sided adhesive 6 and for avoiding FPC4. Because, FPC4 also needs to be disassembled during the disassembly of LCD1, backlight 2 and PCB3. If FPC4 is directly sealed in the connecting layer, when it is subsequently disassembled, the FPC4 is easily damaged when the connecting layer is separated after heating and softening the connecting layer.

[0049] Example 3

[0050] The liquid crystal display module combining FPC and PCB provided in Example 2 is further optimized, and the connection layer is double-sided adhesive 6, and a gap is reserved in the double-sided adhesive 6 to avoid FPC 4.

[0051] The double-sided adhesive tape 6 can also be called double-sided tape, that is, a roll-shaped adhesive tape made of paper, cloth, plastic film, elastomer pressure-sensitive adhesive or resin pressure-sensitive adhesive. The thickness of the double-sided adhesive tape 6 can be controlled when it is produced, and a gap for avoiding FPC 4 can be reserved before leaving the factory, thereby reducing the gluing action and reserved gap action during on-site operation, making it more convenient for manual installation. The error of artificial control of the thickness of the glue is large, and the double-sided adhesive tape 6 of this embodiment is a prefabricated product leaving the factory with higher precision, which is convenient for controlling the process accuracy of installation.

[0052] In this embodiment, LCD 1 includes an upper polarizer 7 , an upper glass 8 , a lower glass 9 and a lower polarizer 10 which are stacked; the bottom edge of the lower glass 9 is connected to the first connection terminal 41 through a driver IC 11 .

[0053] Example 4

[0054] The liquid crystal display module combining FPC and PCB provided in Example 3 is further optimized, and a guide groove 12 for accommodating FPC 4 is provided on a side of the backlight 2 close to the PCB 3 .

[0055] Since the double-sided adhesive 6 generally has a certain flexibility, that is, the supporting performance of the double-sided adhesive 6 is poor, the double-sided adhesive 6 also reserves a gap to avoid the FPC4, which further reduces the supporting performance of the FPC4. Because the present embodiment accommodates the FPC4 through the guide groove 12, the guide groove 12 can limit the contact between the FPC4 and the double-sided adhesive 6 to cause adhesion. The guide groove 12 is generally made of a hard plastic material or a metal material. Therefore, the guide groove 12 itself can also be used to support the gap of the double-sided adhesive 6 between the backlight 2 and the PCB3, thereby improving the connection strength between the backlight 2 and the PCB3. The guide groove 12 only needs to be fixed on the backlight 2 without any restriction on the way of fixing it.

[0056] Example 5

[0057] The FPC and PCB combined liquid crystal display module provided in Example 4 is further optimized, and a wavy surface 13 is provided on the side of the guide groove 12 close to the backlight 2, and the wavy surface 13 is connected to the side of the backlight 2 close to the guide groove 12 through an adhesive layer 14.

[0058] In this embodiment, the back side of the guide groove 12 is fixed to the backlight 2 by adhesive, and the mounting surface of the guide groove 12 is further limited, that is, the mounting surface is a corrugated surface 13. Firstly, on the one hand, the corrugated surface 13 can improve the adhesive retention capacity when the adhesive is applied manually or by machine. On the other hand, the surface area of ​​the corrugated surface 13 that actually contacts the adhesive is larger than the cross-section of the guide groove 12, thereby increasing the contact area between the adhesive layer 14 and the corrugated surface 13, and further increasing the adhesion strength between the two.

[0059] Example 6

[0060] The liquid crystal display module combining FPC and PCB provided in Example 5 is further optimized, and adhesive blocking strips 15 are arranged on all sides of the guide groove 12 close to the FPC 4 .

[0061] In this embodiment, the rubber-blocking pressure strip 15 is a rubber strip.

[0062] Generally speaking, in order to make the adhesive layer 14 fully contact with the corrugated surface 13 and the backlight 2, a larger amount than the ideal value is manually applied on the corrugated surface 13, so that when the guide groove 12 is manually pressed on the backlight 2, the adhesive layer 14 will slightly overflow to the surroundings. If it overflows into the guide groove 12, it will occupy the space reserved for FPC4 in the guide groove 12, and even in some cases it will have a certain degree of adhesion with FPC4. In the present embodiment, the adhesive resistance strip 15 is capable of elastic contraction, so that when the guide groove 12 is fixed on the surface of the backlight 2, the adhesive resistance strip 15 is compressed and in a compressed state. Therefore, the adhesive resistance strip 15 will have a tendency to restore its original shape under the action of elasticity. This tendency will enable the adhesive resistance strip 15 to prevent the adhesive layer 14 that overflows when the guide groove 12 is manually pressed on the backlight 2 from entering the guide groove 12.

[0063] Example 7

[0064] The FPC and PCB combined liquid crystal display module provided in Example 6 is further optimized, and a clamping nail 16 is provided on a side of the guide groove 12 close to the PCB 3; and a clamping slot 17 for sleeve mounting the clamping nail 16 is provided at a corresponding position on the PCB 3.

[0065] In this embodiment, in order to further improve the connection strength between PCB3 and guide groove 12, the two are further fixedly connected by means of a snap (i.e., a clamp 16 and a clamp groove 17). The plug-in connection method of the clamp 16 and the clamp groove 17 is relatively simple to operate, easy to align, and has high stability after connection.

[0066] Example 7

[0067] The liquid crystal display module combined with FPC and PCB provided in Example 6 is further optimized, and the staple 16 is a columnar structure made of elastic plastic, and a V-shaped notch 18 is provided on one end of the columnar structure close to the PCB3, and barbs 19 are provided on the arc surfaces on both sides of the V-shaped notch 18, and a horizontal piece 20 facing the center of the V-shaped notch 18 is connected between the two sides of the slot 17.

[0068] In this embodiment, since the staple 16 and the slot 17 are still prone to fall out after being inserted, the above-mentioned restriction is imposed in this embodiment. Before the slot 17 is sleeved on the staple 16, due to the existence of the V-shaped notch 18, the two sides of the V-shaped notch 18 can be closed toward the center, so that the barbs 19 on both sides of the V-shaped notch 18 are slightly offset inward, so that the barbs 19 will not hinder the insertion of the staple 16 into the slot 17. The crosspiece 20 on the slot 17 is just located on the notch of the V-shaped notch 18. When the slot 17 is sleeved on the staple 16, the crosspiece 20 is also just embedded in the V-shaped notch 18. Since the notch is V-shaped, the crosspiece 20 continues to move downward, which will squeeze the two sides of the V-shaped notch 18 to open, so that the barbs 19 on both sides of the V-shaped notch 18 are slightly offset outward, so that the barbs 19 will be stuck on the PCB 3.

[0069] The use process of the liquid crystal display module combined with FPC and PCB provided by the utility model is as follows:

[0070] First, fix the back of LCD1 and the front of backlight 2, then apply the adhesive layer 14 material to the wavy surface 13 of the guide groove 12 manually or by machine, press the wavy surface 13 onto the surface of the backlight 2 manually, and then use the glue blocking strip 15 to limit the overflow of glue to form the adhesive layer 14, and then fix the double-sided adhesive 6 to other areas on the backlight 2, and then connect one end of FPC4 to the front of PCB3 (the other end is pre-connected to the back of LCD1 and the backlight 2), and then align the slot 17 on PCB3 with the pin 16 to determine the position of PCB3 and backlight 2, and then install PCB3 flatly on the double-sided adhesive 6. At this time, the slot 17 is sleeved on the pin 16 and self-locks synchronously, avoiding the need for an independent locking step, thereby completing the entire installation.

[0071] 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.

[0072] 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 liquid crystal display module combining an FPC and a PCB, comprising an LCD (1), a backlight (2) and a PCB (3) which are stacked, wherein the LCD (1) and the backlight (2) are both provided with an FPC (4), characterized in that: The backlight (2) and the PCB (3) form a gap (5) at least at their bottoms; Along the direction from the LCD (1) to the PCB (3), the FPC (4) is formed by at least a first connection end (41), a first middle section (42), a second middle section (43), and a second connection end (44) being connected in sequence; the first connection end (41) is used for welding with the LCD (1) or the backlight (2); the first middle section (42) is in a bent shape for bypassing the bottom edge of the backlight (2); the second connection end (44) is used for welding with the PCB (3); and the second middle section (43) is used for embedding into the gap (5).

2. The liquid crystal display module combining FPC and PCB according to claim 1, characterized in that: The backlight (2) and the PCB (3) are fixedly connected via a connection layer, and the thickness of the connection layer is greater than the thickness of the FPC (4).

3. The liquid crystal display module combining FPC and PCB according to claim 2, characterized in that: The connection layer is a double-sided adhesive (6), and a gap is reserved in the double-sided adhesive (6) to avoid the FPC (4).

4. The liquid crystal display module combining FPC and PCB according to claim 2 or 3, characterized in that: The LCD (1) comprises an upper polarizer (7), an upper glass (8), a lower glass (9) and a lower polarizer (10) which are stacked; The bottom edge of the lower glass (9) is connected to the first connection end (41) via a driver IC (11).

5. The liquid crystal display module combining FPC and PCB according to claim 1, characterized in that: A guide groove (12) for accommodating the FPC (4) is provided on a side of the backlight (2) close to the PCB (3).

6. The liquid crystal display module combining FPC and PCB according to claim 5, characterized in that: A wavy surface (13) is provided on one side of the guide groove (12) close to the backlight (2), and the wavy surface (13) is connected to a side of the backlight (2) close to the guide groove (12) via an adhesive layer (14).

7. The liquid crystal display module combining FPC and PCB according to claim 6, characterized in that: All sides of the guide groove (12) close to the FPC (4) are provided with glue-blocking strips (15).

8. The liquid crystal display module combining FPC and PCB according to claim 7, characterized in that: The rubber-blocking pressure strip (15) is a rubber strip.

9. The liquid crystal display module combining FPC and PCB according to claim 7, characterized in that: A clamping nail (16) is provided on a side of the guide groove (12) close to the PCB (3); A slot (17) for sleeve-mounting a clamping pin (16) is provided at a corresponding position on the PCB (3).

10. The liquid crystal display module combining FPC and PCB according to claim 9, characterized in that: The clamp (16) is a columnar structure made of elastic plastic, with a V-shaped notch (18) formed at one end of the columnar structure close to the PCB (3), barbs (19) being provided on both side arc surfaces of the V-shaped notch (18), and a horizontal piece (20) facing the center of the V-shaped notch (18) being connected between the two sides of the clamping slot (17).

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