CN1971345B - Flexible printed circuit and LCD - Google Patents

Abstract

The invention relates to a liquid crystal display, which mainly includes a liquid crystal display panel and a flexible circuit board, and the flexible circuit board is connected to the edge of the liquid crystal display panel. The flexible circuit board includes a main part and a connecting part. The main part is the circuit transmission part of the flexible circuit board, and it includes a reinforcing branch, and the reinforcing branch is a branch structure extending from the main part. The connecting part is integrated with the main body and communicates with the circuit, and both the reinforcing branch and the connecting part serve as a connecting and fixing structure for the flexible circuit board. The flexible circuit board of the liquid crystal display is not easy to break or tear.

Description

Flexible printed circuit and LCD

【Technical field】

The invention relates to a flexible printed circuit and a liquid crystal display using the flexible printed circuit.

【Background technique】

At present, methods for connecting LCD panels to driver ICs include COG (Chip On Glass, Chip On Glass) technology, TAB (Tape Automatic Bonding, Tape Automatic Bonding) technology, and COF (Chip On Film, Thin Film On Chip) technology.

Among them, the COG technology can be used to directly install the driver IC in the form of a semiconductor package on the gate line and data line of the liquid crystal panel, so as to transmit the electrical signal to the liquid crystal panel. The driver IC is bonded to the liquid crystal panel with an anisotropic conductive film.

In addition, using TAB technology, the liquid crystal panel can be directly connected to the printed circuit board through the tape carrier package (Tape Carrier Package), and the driver IC can be mounted on the tape carrier package. In this way, one end of the tape conductor package is connected to the liquid crystal display panel, and the other end is connected to the printed circuit board.

With the continuous development of LCD towards light weight and high brightness, reliable flexibility cannot be obtained by only using tape conductors to package LCD modules. Therefore, COF technology can also be used, that is, to combine driver ICs with fine-pitch flexible circuit boards. Then bond to the glass substrate or PCB board in a way similar to TAB.

FIG. 1 is a three-dimensional schematic diagram of a liquid crystal display in the prior art. The liquid crystal display 1 includes a liquid crystal display panel 10 and a flexible circuit board 11 for transmitting driving signals to the liquid crystal display panel 10 .

2 and 3 are a front view and a side view of the liquid crystal display 1, respectively. The flexible circuit board 11 includes a main body 12 and a connecting portion 13 . The main body part 12 is integrated with the connection part 13 and communicates with the circuit. The connection part 13 can be mounted on the edge of the liquid crystal display panel 10 , and includes a metal wiring layer 131 , an insulating layer 132 and two identification patterns 14 . The metal wiring layer 131 includes a plurality of metal wires arranged in parallel. The insulation layer 132 partially covers the plurality of metal wires, and exposes the ends of the plurality of metal wires to be electrical connection ends 133 . The logo pattern 14 is located on both sides of the insulating layer 132, which can be used as an alignment reference for connecting the flexible circuit board 11 and the liquid crystal display panel 1, so that the circuit of the flexible circuit board 11 and the liquid crystal display panel 10 The circuits are matched to avoid short-circuit and open-circuit problems caused by missing or wrong connections.

However, in the liquid crystal display 1, the flexible circuit board 11 is connected to the edge of the liquid crystal display panel 10 by applying the COF technology in combination with the TAB technology. Tearing or breaking occurs under the action of tension, resulting in errors or interruptions in the transmission of electrical signals.

【Content of invention】

In order to solve the problem that the flexible circuit board is easy to tear or break in the prior art, it is necessary to provide a flexible circuit board that is not easy to tear or break.

In order to solve the problem that the flexible circuit board of the liquid crystal display in the prior art is easy to tear or break, it is necessary to provide a liquid crystal display with a flexible circuit board that is not easy to tear or break.

A flexible circuit board, which includes a main body part and a connecting part, the main body part is the circuit transmission part of the flexible circuit board, and it includes a reinforcing branch, and the reinforcing branch is a branch extending from the main body part. The connecting part is integrated with the main part and communicated with the circuit, the reinforcing branch and the connecting part are both used as the connection and fixing structure of the flexible circuit board, and the end of the reinforcing branch is connected to the connecting part The ends are on the same side of the flexible circuit board.

A liquid crystal display mainly includes a liquid crystal display panel and a flexible circuit board, and the flexible circuit board is connected to the edge of the liquid crystal display panel. The flexible circuit board includes a main body part and a connecting part, the main body part is the circuit transmission part of the flexible circuit board, and it includes a reinforcing branch, and the reinforcing branch is a branch extending from the main body part structure. The connecting part is integrated with the main part and communicated with the circuit. Both the reinforcing branch and the connecting part are used as the connection and fixing structure of the flexible circuit board, and the end of the reinforcing branch and the end of the connecting part are located on the flexible circuit board. same side of the circuit board.

When the flexible circuit board is connected to the liquid crystal display panel by welding or COF combined with TAB technology, the flexible circuit board will be subjected to tension. At this time, the reinforcing branch of the flexible circuit board will share the tension and relieve the external force on the electrical joint end of the connecting part, thereby protecting the connecting part of the flexible circuit board and prolonging the service life of the flexible circuit board , Furthermore, the quality of the liquid crystal display using the flexible circuit board is also improved.

【Description of drawings】

FIG. 1 is a three-dimensional schematic diagram of a liquid crystal display in the prior art.

Fig. 2 is a front view of a prior art liquid crystal display.

Fig. 3 is a side view of a prior art liquid crystal display.

FIG. 4 is an exploded schematic view of the first embodiment of the liquid crystal display of the present invention.

Fig. 5 is a cross-sectional view along the V-V direction of Fig. 4 .

Fig. 6 is a side view of the first embodiment of the liquid crystal display of the present invention.

FIG. 7 is a schematic perspective view of the first embodiment of the liquid crystal display of the present invention.

Fig. 8 is a front view of the first embodiment of the liquid crystal display of the present invention.

Fig. 9 is a front view of the second embodiment of the liquid crystal display of the present invention.

Fig. 10 is a front view of the third embodiment of the liquid crystal display of the present invention.

Fig. 11 is a front view of the fourth embodiment of the liquid crystal display of the present invention.

Fig. 12 is a front view of the fifth embodiment of the liquid crystal display of the present invention.

Fig. 13 is a partially enlarged view of part XIII in Fig. 12 .

【Detailed ways】

Please refer to FIG. 4 and FIG. 5 , which are respectively an exploded schematic diagram and a schematic cross-sectional diagram of the first embodiment of the liquid crystal display of the present invention. The liquid crystal display 2 includes a liquid crystal display panel 20 and a flexible circuit board 21 , and the flexible circuit board 21 is connected to an edge of the liquid crystal display panel 20 .

The flexible circuit board 21 includes a main body portion 22 and a connecting portion 23 , the main body portion 22 and the connecting portion 23 are integrated and communicated with each other. The connection portion 23 is in electrical communication with the liquid crystal display panel 20 .

The main part 22 includes two reinforcing branches 221, which are two strip-shaped insulating branch structures, which extend forward from both sides of the main part 22 and are arranged in parallel with the connecting part 23, and their The end part and the connection part 23 are fixed at the edge of the liquid crystal display panel 20. When it is connected to the liquid crystal display panel 20 by welding or COF combined with TAB technology, the ends of the two reinforcing branches 221 are connected to the connection The ends of section 23 remain substantially flush.

Please refer to FIG. 6 , FIG. 7 and FIG. 8 , which are respectively a side view, a perspective view and a front view of the liquid crystal display 2 . The connecting portion 23 includes a metal wiring layer 231 , an insulating layer 232 , two identification patterns 24 and a buffer area 235 . The metal wiring layer 231 includes a plurality of metal wires arranged in parallel, one side of the plurality of metal wires is completely covered by the insulating layer 232, and the other side is partially covered by the insulating layer 232, and the exposed metal wires Part is the electrical connection end 233 of the connecting portion 23 . The electrical connection end 233 is an electrical contact end of the flexible circuit board 21 . The buffer area 235 is located on the connecting portion 23 adjacent to the main body portion 22 , and is a stretchable area with a bending arc length of at least 0.5 mm, which can be formed by pressing the connecting portion 23 itself. The two logo patterns 24 are respectively located at the corners of the two sides of the connecting portion 23, which can be used as an alignment reference between the connecting portion 23 and the liquid crystal display panel 20, so that the circuit of the flexible printed circuit board 21 is aligned with the liquid crystal display panel 20. The circuitry of panel 20 is matched.

In the liquid crystal display 2, when the flexible circuit board 21 is subjected to an external force, due to the increase of the two reinforcing branches 221, the stress area of the flexible circuit board 21 and the liquid crystal display panel 20 is increased, thereby reducing The stress strength of the connecting portion 23 . Although at the moment of stress, because the area of the connecting portion 23 is larger than that of the two reinforcing branches 221, the connecting portion 23 will still bear a larger force at the moment of stress, but, due to the existence of a buffer zone 235, its bending area Stretching out, the force of the connecting part 23 at the moment of force is effectively buffered, and the two reinforcing branches 221 will bear the external force at the same time, thereby reducing the force of the connecting part 23 and prolonging the flexible circuit. The service life of the plate 21.

Please refer to FIG. 9 , which is a front view of the second embodiment of the liquid crystal display of the present invention. The liquid crystal display 3 includes a liquid crystal display panel 30 and a flexible circuit board 31 , and the flexible circuit board 31 is connected to an edge of the liquid crystal display panel 30 .

The flexible circuit board 31 includes a main body portion 32 and a connecting portion 33 , the main body portion 32 and the connecting portion 33 are integrated and communicated with each other. The connection portion 33 communicates with the liquid crystal display panel 30 .

The main part 32 includes a reinforcing branch 321, which is a strip-shaped insulating branch structure, which extends forward from the central position of the main part 32, and is arranged in parallel with the connecting part 33, and its end part is connected to the connecting part 33. The portion 33 is fixed at the edge of the LCD panel 30 . When it is connected to the liquid crystal display panel 30 by welding or COF combined with TAB technology, the end of the reinforcing branch 321 and the end of the connecting portion 33 are substantially flush.

The connecting portion 33 includes two metal wiring layers 331 , two insulating layers 332 , two identification patterns 34 and two buffer regions 335 . The two metal wiring layers 331 include a plurality of metal wires arranged in parallel. The two insulating layers 332 partially cover the metal wiring layer 331 , so that the ends of the plurality of metal wires are exposed as two electrical connection ends 333 , and the electrical connection ends 333 are electrical contact ends of the flexible circuit board 31 . The two cushioning regions 335 are located on the connecting portion 33 adjacent to the main body portion 32 , and are two stretching regions with a bending arc length of at least 0.5 mm. The two logo patterns 34 are respectively located on the two corners of the connecting portion 33 adjacent to the reinforcing branch 321, which can be used as an alignment reference between the connecting portion 33 and the liquid crystal display panel 30, so that the flexible circuit board The circuit of 31 is matched with the circuit of the liquid crystal display panel 30.

The reinforcing branch 321 and the buffer area 335 change the stress on the connecting portion 33 of the flexible circuit board 31 , thereby achieving the purpose of protecting the flexible circuit board 31 .

Fig. 10 is a front view of the third embodiment of the liquid crystal display of the present invention. The liquid crystal display 4 includes a liquid crystal display panel 40 and a flexible circuit board 41 , and the flexible circuit board 41 is connected to an edge of the liquid crystal display panel 40 .

The flexible circuit board 41 includes a main body portion 42 and a connecting portion 43 , the main body portion 42 and the connecting portion 43 are integrated and communicated with each other. The connecting portion 43 communicates with the liquid crystal display panel 40 .

The main body 42 includes two reinforcing branches 421 , and the two reinforcing branches 421 are two strip-shaped insulating branch structures, and have a convex surface 4211 at the end of the strip-shaped branch. The two reinforcing branches 421 extend forward from two sides of the main body portion 42 and are parallel to the connecting portion 43 , and their end portions and the connecting portion 43 are fixed to the edge of the liquid crystal display panel 40 . When it is connected to the liquid crystal display panel by welding or COF combined with TAB technology, the ends of the two reinforcing branches 421 and the ends of the connecting portion 43 are basically kept flush.

The connecting portion 43 includes a metal wiring layer 431 , an insulating layer 432 , two identification patterns 44 and a buffer area 435 . The metal wiring layer 431 includes a plurality of metal wires arranged in parallel. The insulating layer 432 partially covers the plurality of metal wires of the metal wiring layer 431 , and exposes the ends of the plurality of metal wires to form an electrical connection end 433 , which is an electrical contact end of the flexible circuit board 41 . The cushioning area 435 is located on the connecting portion 43 adjacent to the main body portion 42 , and is a stretching area with a bending arc length of at least 0.5 mm. The two logo patterns 44 are respectively marked on the corners on both sides of the insulating layer 432, which can be used as an alignment reference between the connecting portion 43 and the liquid crystal display panel 40, so that the circuit of the flexible circuit board 41 and the liquid crystal The circuitry of the display panel 40 is matched.

In this embodiment, the convex surface 4211 increases the stressed area of the reinforcing branch 421 and reduces the stressed strength of the reinforcing branch 421 . When the external force on the flexible circuit board 41 increases, the reinforcing branch 421 can still bear it, so as to better protect the connecting portion 43 .

Fig. 11 is a front view of a liquid crystal display according to a fourth embodiment of the present invention. The liquid crystal display 5 includes a liquid crystal display panel 50 and a flexible circuit board 51 , and the flexible circuit board 51 is connected to an edge of the liquid crystal display panel 50 .

The flexible circuit board 51 includes a main body 52 and a connecting portion 53 , the main body 52 is integral with the connecting portion 53 and communicates with the circuit, and the connecting portion 53 communicates with the liquid crystal display panel 50 .

The main body 52 includes two reinforcing branches 521 and two identification patterns 54. The two reinforcing branches 521 are two strip-shaped insulating branch structures, which extend forward from both sides of the main body 52 and are connected to the The parts 53 are arranged in parallel, and their end parts and the connecting part 53 are fixed at the edge of the liquid crystal display panel 50 . When it is connected to the liquid crystal display panel 50 by welding or COF combined with TAB technology, the ends of the two reinforcing branches 521 are substantially flush with the ends of the connecting portion 53 . The two logo patterns 54 are respectively located at the ends of the two reinforcing branches 521, which can be used as alignment references between the connecting portion 53 and the liquid crystal display panel 50, and further make the circuit of the flexible circuit board 51 and the liquid crystal The circuitry of the display panel 50 is matched.

The connecting portion 53 includes a metal wiring layer 531 , an insulating layer 532 and a buffer region 535 . The metal wiring layer 531 includes a plurality of metal wires arranged in parallel. The insulating layer 532 covers the plurality of metal wires, so that the ends of the plurality of metal wires are exposed as an electrical connection end 533 , and the electrical connection end 533 is an electrical contact end of the flexible circuit board 51 . The buffer zone 535 is located on the connection portion 53 adjacent to the main body portion 52 , and is a flex zone with a bending arc length of at least 0.5 mm.

Referring to FIG. 12 , it is a front view of the fifth embodiment of the liquid crystal display of the present invention. The liquid crystal display 6 includes a liquid crystal display panel 60 and a flexible circuit board 61 , and the flexible circuit board 61 is connected to an edge of the liquid crystal display panel 60 .

The flexible circuit board 61 includes a main body 62 and a connecting portion 63 , the main body 62 is integrated with the connecting portion 63 and is in electrical communication, and the connecting portion 63 is in electrical communication with the liquid crystal display panel 60 .

The main part 62 includes two reinforcing branches 621, which are two strip-shaped insulating branch structures. The reinforcing branches extend forward from both sides of the main part 62 and are parallel to the connecting part 63 Arranged, and its end portion and the connection portion 63 are fixed at the edge of the liquid crystal display panel 60. When it is connected to the liquid crystal display panel 60 by welding or COF combined with TAB technology, the two reinforcing branches 621 The end is substantially flush with the end of the connecting portion 63.

The connection portion 63 includes a metal wiring layer 631 , an insulating layer 632 , two identification areas 64 and a buffer area 635 . The metal wiring layer 631 includes a plurality of metal wires arranged in parallel, and the insulating layer 632 partially covers the multiple metal wires of the metal wiring layer 631, so that the ends of the metal wires are exposed as an electrical connection end 633, and the electrical connection Terminal 633 is an electrical contact terminal of the flexible circuit board 61 . The cushioning area 635 is located on the connecting portion 63 adjacent to the main body portion 62 , and is a stretching area with a bending arc length of at least 0.5 mm.

Please also refer to FIG. 13, which is a partial enlarged view of part XIII in FIG. The second concave surface 6321 is exactly opposite to the first concave surface 6211 of the reinforcing branch 621 to form a marking area 64 . The identification area 64 can be used as an alignment reference between the connecting portion 63 and the liquid crystal display panel 60 , so that the circuit of the flexible circuit board 61 matches the circuit of the liquid crystal display panel 60 .

In the above embodiments of the present invention, the flexible circuit board can be a single-layer single-sided structure, a single-layer double-sided structure or a double-layer structure. The multiple metal wires of the metal wiring layer of the flexible circuit board can be copper foil wires or wires made of copper beryllium alloy. Among them, the single-layer single-sided structure is that the insulating layer covers the two sides of the metal wiring layer, but its electrical connection end is located on the same side of the metal wiring layer; the single-layer double-sided structure is that the electrical connection ends are respectively located The two sides of the metal wiring layer; and the double-sided structure has two metal wiring layers connected through a via hole.

Claims (10)

1. flexible circuit board, it comprises a main part and a junction branch, this main part is the circuit transmission part of this flexible circuit board, this coupling part and circuit in aggregates with this main part communicates, it is characterized in that: this main part comprises a reinforcement branch, this reinforcement branch is a branched structure that extends from this main part, this reinforcement branch and this coupling part are all as the structure that is connected and fixed of this flexible circuit board, and the end of the end of this reinforcement branch and this coupling part is positioned at the same side of this flexible circuit board.

2. flexible circuit board as claimed in claim 1, it is characterized in that: this coupling part also comprises a metal wiring layer, an insulation course and an identification pattern, this metal wiring layer comprises a plurality of plain conductors of parallel arranged, this insulation course partly coats a plurality of plain conductors of this metal wiring layer, electrically contact end thereby the exposed part of these a plurality of plain conductors is become, this identification pattern is for connecting the contraposition reference of this flexible circuit board and this display panels.

3. flexible circuit board as claimed in claim 2 is characterized in that: this identification pattern is positioned in this reinforcement branch.

4. flexible circuit board as claimed in claim 2 is characterized in that: this identification pattern is an identified areas, and this identified areas is made of two concave surfaces of corresponding setting on this reinforcement branch and this coupling part.

5. flexible circuit board as claimed in claim 1 is characterized in that: this reinforcement branch is a strip structure.

6. flexible circuit board as claimed in claim 1 is characterized in that: the end of this reinforcement branch keeps concordant substantially with the end of this coupling part.

7. soft electroplax as claimed in claim 1 is characterized in that: this reinforcement branch and this coupling part are arranged in parallel.

8. flexible circuit board as claimed in claim 1 is characterized in that: this coupling part also comprises a buffer area.

9. flexible circuit board as claimed in claim 8 is characterized in that: the arc of curvature length of this buffer area is at least 0.5mm.

10. LCD, it comprises a display panels and a flexible circuit board, this flexible circuit board is connected the edge of this display panels, and this flexible circuit board is any described flexible circuit board in the claim 1 to 9.

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