A flexible circuit board with even binding force and a method for binding the same with an LCD

Abstract

The present invention discloses a flexible circuit board with uniform binding force and a binding method with an LCD. The flexible circuit board includes a substrate, a plurality of binding end gold fingers and a plurality of plug-in end gold fingers arranged on the substrate. The binding end gold fingers and the plug-in end gold fingers are connected by lines. The binding end gold fingers are used to bind with the LCD. The binding part of each binding end gold finger is of equal width. The roots of any adjacent binding end gold fingers can be merged. The width of the merged roots corresponds to the width of different binding positions of the LCD. The width of the binding part of the binding end gold fingers of the present invention is consistent. When binding, the small gold ball is uniformly stressed in the area with a large binding width and a small binding width on the LCD, with consistent deformation strength and good conductivity.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit boards, and in particular to a flexible circuit board with evenly bound force and a method for binding the flexible circuit board to an LCD. Background Art

[0002] With the development of display technology, the content of displays is becoming more and more abundant. When liquid crystal displays (LCDs) are applied to complex products, two parts of display content with different rules need to be displayed on the same LCD. In order to ensure that the resistance value of the display content meets the design requirements, it is necessary to design Figure 2 , 3 The two LCD binding positions with different widths are shown. The conventional design technology is: the width of the binding position of the flexible circuit board is designed to be the same as the width of the LCD binding position, and then the flexible circuit board and LCD are connected through the small gold balls in the ACF to achieve normal LCD display, such as Figure 1 . However, due to the inconsistency of the binding width, the size of the force-bearing area will also be different. From the calculation formula p (pressure) = F (pressure) / S (force-bearing area), it can be seen that the same flexible circuit board will have two extreme pressure uneven phenomena: (1) When the small gold ball in the left binding width area with a large force is moderate, the small gold ball in the right binding width area with a small force is not stressed, which is a state of no force and no conduction; (2) When the small gold ball in the left binding width area with a small force is moderate, the small gold ball in the right binding width area with a large force is too large, causing damage and failure. The existing design technology is a flexible circuit board that meets the circuit requirements while solving the problem of uneven force during the binding process. Summary of the invention

[0003] The invention provides a flexible circuit board with uniform binding force and a method for binding the flexible circuit board to an LCD, thereby solving the problem of uneven force when the flexible circuit board is bound to an LCD.

[0004] In order to solve the above technical problems, the present invention discloses a flexible circuit board with uniform binding force, comprising a substrate, a plurality of binding end gold fingers and a plurality of plug-in end gold fingers arranged on the substrate, the binding end gold fingers and the plug-in end gold fingers are connected by lines, the binding end gold fingers are used to bind to an LCD, the binding part of each binding end gold finger is of equal width, the roots of any adjacent binding end gold fingers can be merged, and the width of the merged roots corresponds to the width of different binding positions of the LCD.

[0005] Preferably, the width of the binding portion of each binding end gold finger is 0.22-0.23 mm.

[0006] Preferably, the spacing between adjacent binding end gold fingers is equal.

[0007] Preferably, the spacing between adjacent binding end gold fingers is 0.19-0.20 mm.

[0008] Preferably, the length of the gold finger at the binding end is shorter than the length of the gold finger at the binding side of the LCD. Further preferably, the length of the gold finger at the binding end is 0.15 mm shorter than the length of the gold finger at the binding side of the LCD. The length of the gold finger at the binding end of the flexible circuit board is designed to be 0.15 mm lower than the length of the gold finger at the binding side of the LCD, which can prevent the short circuit problem between the gold fingers at the binding side adjacent to the LCD from occurring when the binding is slightly offset upward.

[0009] Preferably, a covering film is provided on the upper surface of the circuit, and the covering film is wavy on the side near the gold finger of the binding end, wherein the crest is at the same height as the top of the root of the gold finger of the binding end, and the trough is lower than the bottom of the root of the gold finger of the binding end. The wavy covering film is partially on the glass and partially not, so as to prevent the edge of the glass from cutting the root of the gold finger of the binding end, causing the gold finger of the binding end to break.

[0010] The present invention also discloses a method for binding a flexible circuit board with evenly-bound force to an LCD, comprising the following steps:

[0011] First, according to the different widths of the gold fingers on the binding side of the LCD binding area, in the window area of ​​the flexible circuit board, the roots of the gold fingers on the adjacent binding ends are merged into a width corresponding to the width of the gold fingers on the binding side of the LCD by merging multiple lines;

[0012] Secondly, when the flexible circuit board and LCD begin to be bound, place the ACF on the gold fingers on the binding side of the LCD, then align the flexible circuit board and the LCD, and use the binding equipment to press the gold fingers on the binding end to squeeze the small gold balls in the ACF, so that the small gold balls contact the gold fingers on the binding side of the LCD. The small gold balls must be deformed by appropriate force to play a good conductive role. Because the binding part width of each gold finger on the binding end of the flexible circuit board is consistent, the small gold balls are evenly stressed, the deformation force is consistent, and the conductivity is good.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. The width of the binding part of the gold finger at the binding end is consistent. When binding, the small gold ball on the LCD has a large binding width and a small binding width. The force is uniform, the deformation force is consistent, and the conductivity is good. This solves the problem that the small gold ball is not stressed or is damaged by excessive force, and then fails to conduct electricity, which leads to abnormal LCD display.

[0015] 2. The roots of the gold fingers at the binding end can be merged so that the root width corresponds to the different binding widths of the LCD, which can meet the needs of LCD products with various sizes of binding widths.

[0016] 3. The flexible circuit board of the present invention can use existing flexible circuit board production equipment, etc., which is convenient to manufacture, easy to implement, and has low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a traditional flexible circuit board;

[0018] Figure 2 A schematic diagram of the binding of a traditional flexible circuit board to an LCD;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a structural schematic diagram of a flexible circuit board with evenly bound force according to the present invention;

[0021] Figure 5 A schematic diagram of the flexible circuit board and the LCD of the present invention being bound together;

[0022] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0023] Figure numerals: 1, substrate, 2, binding end gold finger; 21, binding part, 22, root part, 3, plug-in end gold finger; 4, circuit; 5, covering film; 6, LCD. DETAILED DESCRIPTION

[0024] In order to make the purpose and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0025] like Figure 4 As shown, the present invention discloses a flexible circuit board with even binding force, which is more suitable for LCD6 products with segmented display areas and binding widths of various sizes. The flexible circuit board of the present invention includes a substrate 1, a plurality of binding end gold fingers 2 and a plurality of plug-in end gold fingers 3, the binding end gold fingers 2 and the plurality of plug-in end gold fingers 3 are attached to the substrate 1, and the binding end gold fingers 2 and the plug-in end gold fingers 3 are connected through a line 4, and the binding end gold fingers 2 are used to bind to the LCD6 to be connected. The binding portion 21 on the upper part of each binding end gold finger 2 is of equal width, and the roots 22 of any adjacent binding end gold fingers 2 can be merged, that is, the width of the binding portion 21 of each binding end gold finger 2 is equal. When binding with LCD6, according to the binding positions of LCD6 with different widths, the roots 22 of the adjacent binding end gold fingers 2 are merged (after merging, the adjacent binding end gold fingers form a comb shape), so that the width of the roots 22 of the merged binding end gold fingers 2 is equal to the width of the binding position of LCD6, forming a one-to-one correspondence with the width of the different binding positions of LCD6.

[0026] As a preferred embodiment, the spacing between adjacent binding end gold fingers 2 is equal, and the spacing between adjacent binding end gold fingers 2 is 0.19-0.20mm; the binding portion width of each binding end gold finger 2 is 0.22-0.23mm. With this design, when the roots 22 of the binding end gold fingers 2 are merged, they can be merged to be equal to the width of any binding position of LCD6.

[0027] As a preferred embodiment, the length of the binding end gold finger 2 is shorter than the length of the binding side gold finger of the LCD 6 to be connected. The best is that the length of the binding end gold finger 2 is 0.15mm shorter than the length of the binding side gold finger of the LCD 6. The length of the binding end gold finger 2 is 0.15mm lower than the length of the binding side gold finger of the LCD 6, which can prevent the short circuit problem between the adjacent binding side gold fingers of the LCD 6 when the binding is slightly biased upward.

[0028] As a preferred embodiment, a covering film 5 is provided on the upper surface of the circuit 4, and the covering film 5 is wavy on the side near the binding end gold finger 2, wherein the wave crest is at the same height as the top of the root 22 of the binding end gold finger 2, and the wave trough is lower than the bottom of the root 22 of the binding end gold finger 2. This can prevent the glass edge from cutting the root 22 of the binding end gold finger 2, causing the binding end gold finger 2 to break.

[0029] A method for binding a flexible circuit board with evenly-bound force to an LCD 6 comprises the following steps:

[0030] First, according to the different widths of the binding side gold fingers of the LCD6 binding area, in the window area of ​​the flexible circuit board, the roots 22 of the adjacent binding end gold fingers 2 are merged into a width corresponding to the width of the binding side gold fingers of the LCD6 by merging multiple lines;

[0031] Secondly, when the flexible circuit board and LCD6 begin to be bound, the ACF is placed on the gold finger on the binding side of LCD6, and then the flexible circuit board and LCD6 are aligned, and then the binding equipment is used to press the binding end gold finger 2 to squeeze the small gold ball in the ACF through appropriate temperature and pressure, so that the small gold ball contacts the gold finger on the binding side of LCD6. The small gold ball should be properly deformed by force to play a good conductive role. Because the width of the binding part 21 of each binding end gold finger 2 in the flexible circuit board is consistent, the small gold ball is evenly stressed, the deformation force is consistent, and the conductivity is good. Figure 5 , 6 As shown, it is a schematic diagram of the flexible circuit board of the present invention being bound to LCD 6. After the binding is completed and the ACF thermal adhesive is cooled, the structure is stable, ensuring the effective connection of the circuit 4.

[0032] The above embodiments are only specific examples for further describing the purpose, technical solutions and beneficial effects of the present invention, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope of the disclosure of the present invention are included in the protection scope of the present invention.

Claims

1. A flexible circuit board with uniform binding force, comprising a substrate (1), a plurality of binding end gold fingers (2) and a plurality of plug-in end gold fingers (3) arranged on the substrate (1), the binding end gold fingers (2) and the plug-in end gold fingers (3) being connected via a line (4), the binding end gold fingers (2) being used for binding with an LCD (6), characterized in that: The binding parts (21) of each binding end gold finger (2) are of equal width, and multiple roots (22) of any adjacent binding end gold fingers (2) can be combined, and the width of the combined roots (22) corresponds to the width of different binding positions of the LCD (6) in a one-to-one manner; The method for binding the flexible circuit board to the LCD, The following steps are involved: First, according to the different widths of the gold fingers on the binding side of the LCD (6) binding area, in the window area of ​​the flexible circuit board, the roots (22) of the adjacent gold fingers on the binding end (2) are merged into a width corresponding to the width of the binding position of the LCD (6) by merging multiple lines; Secondly, when the flexible circuit board and the LCD (6) begin to be bound, the ACF is placed on the gold finger on the binding side of the LCD (6), and then the flexible circuit board and the LCD (6) are aligned, and then the binding end gold finger (2) of the binding device is used to press the binding end gold finger (2) to squeeze the small gold ball in the ACF, so that the small gold ball contacts the ITO end of the LCD (6), wherein the small gold ball should be properly deformed by force to play a good conductive role. Since the width of the binding part (21) of each binding end gold finger (2) in the flexible circuit board is consistent, the small gold ball is evenly stressed, the deformation force is consistent, and the conductivity is good.

2. The flexible circuit board with uniform binding force according to claim 1, characterized in that: The width of the binding portion (21) of each binding end gold finger (2) is 0.22-0.23 mm.

3. The flexible circuit board with evenly bound force according to claim 1, characterized in that: The spacing between adjacent binding end gold fingers (2) is equal.

4. The flexible circuit board with uniform binding force according to claim 3, characterized in that: The spacing between adjacent binding end gold fingers (2) is 0.19-0.20 mm.

5. A flexible circuit board with evenly bound force according to any one of claims 1 to 4, characterized in that: The length of the binding end gold finger (2) is shorter than the length of the binding side gold finger of the LCD (6).

6. The flexible circuit board with evenly bound force according to claim 5, characterized in that: The length of the binding end gold finger (2) is 0.15 mm shorter than the length of the binding side gold finger of the LCD (6).

7. The flexible circuit board with evenly bound force according to claim 1, characterized in that: A covering film (5) is provided on the upper surface of the circuit (4), and the covering film (5) is wavy on the side close to the binding end gold finger (2), wherein the crest is at the same height as the top of the root (22) of the binding end gold finger (2), and the trough is lower than the bottom of the root (22) of the binding end gold finger (2).

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