阅读说明：本技术 覆晶薄膜及显示装置 (Chip on film and display device ) 是由 袁传贵 于 2019-08-23 设计创作，主要内容包括：本发明揭露一种覆晶薄膜及显示装置,覆晶薄膜的连接端设置有至少一插接针,柔性印刷电路板的连接端设置有至少一插接口,柔性印刷电路板与覆晶薄膜间接合采用插接针与插接口配合的插接方式,优化了柔性印刷电路板与覆晶薄膜之间的接合制程,提高了柔性印刷电路板与覆晶薄膜之间的线路导通精度和良率,且节省了异方性导电胶膜的材料成本、以及热压合所需设备成本,提高了显示装置产品精度和良率。(The invention discloses a chip on film and a display device, wherein the connecting end of the chip on film is provided with at least one inserting needle, the connecting end of a flexible printed circuit board is provided with at least one inserting port, the flexible printed circuit board and the chip on film are jointed in an inserting mode of matching the inserting needle with the inserting port, the jointing process between the flexible printed circuit board and the chip on film is optimized, the circuit conduction precision and the yield between the flexible printed circuit board and the chip on film are improved, the material cost of an anisotropic conductive adhesive film and the equipment cost required by hot-pressing are saved, and the product precision and the yield of the display device are improved.)

1. A chip on film, comprising a flexible film, the flexible film comprising a first surface, the first surface comprising:

a chip bonding region, wherein a chip is arranged in the chip bonding region; and

the first connecting end is provided with at least one plug pin, and the plug pin is used for electrically connecting the flexible printed circuit board.

2. The chip on film as claimed in claim 1, wherein the first connecting terminal further has a first pin alignment mark and a second pin alignment mark, wherein the first pin alignment mark and the second pin alignment mark are respectively disposed at two ends of the region where the pins are located.

3. The chip on film of claim 2, wherein the first pin alignment mark and the second pin alignment mark have different shapes.

4. The chip on film of claim 1, further comprising a second connection terminal on the first surface, wherein the second connection terminal is provided with at least one bonding pad for electrically connecting to a display panel.

5. The chip on film as claimed in claim 4, wherein the second connection terminal further has a first connection alignment mark and a second connection alignment mark, wherein the first connection alignment mark and the second connection alignment mark are respectively disposed at two ends of the region where the bonding pad is located, and the first connection alignment mark and the second connection alignment mark have different shapes.

6. A display device, comprising:

a display panel including an external lead connection region;

the first connecting end of the chip on film is provided with at least one inserting needle, and the second connecting end of the chip on film is provided with at least one bonding pad;

a conductive connection layer electrically connected to the bonding pad on the external lead connection region; and

the first connecting end of the flexible printed circuit board is provided with at least one inserting port, and the inserting needle is inserted into the inserting port so as to electrically connect the flexible printed circuit board with the chip on film.

7. The display device according to claim 6, wherein the first connection terminal of the flip chip is further provided with a first pin alignment mark and a second pin alignment mark, wherein the first pin alignment mark and the second pin alignment mark are respectively disposed at two ends of the region where the pins are located;

the first connecting end of the flexible printed circuit board is also provided with a first interface alignment mark and a second interface alignment mark, wherein the first interface alignment mark and the second interface alignment mark are respectively arranged at two ends of the area where the interface is located.

8. The display device of claim 7,

a first space is formed between the first pin alignment mark and the second pin alignment mark;

the first interface alignment mark and the second interface alignment mark comprise a second space;

the first pitch is the same as the second pitch.

9. The display device as claimed in claim 7, wherein the first pin alignment mark and the second pin alignment mark have different shapes, and the first interface alignment mark and the second interface alignment mark have different shapes.

10. The display device as claimed in claim 6, wherein the second connection terminal of the COF is further provided with a first connection alignment mark and a second connection alignment mark, wherein the first connection alignment mark and the second connection alignment mark are respectively disposed at two ends of the region where the bonding pad is located, and the first connection alignment mark and the second connection alignment mark have different shapes.

Technical Field

The invention relates to the technical field of display, in particular to a chip on film and a display device.

Background

With the development of display technology, the display technology enters a flexible era, and the OLED (Organic Light Emitting Diode) display technology is the mainstream flexible technology at present. At present, the main Flexible screen is connected between a Chip On Film (COF) and an OLED panel (Bonding), and a Flexible Printed Circuit board (FPC) and a flip Chip Film (Bonding), so as to connect an external current into the flip Chip Film and the Flexible Printed Circuit board, and further to connect an internal Circuit of the Flexible screen, thereby achieving a display effect.

Referring to fig. 1-3, fig. 1 is a schematic diagram of an anisotropic conductive film bonding process in a conventional bonding process, fig. 2 is a schematic diagram of bonding between a flip chip film and an OLED panel in the conventional bonding process, and fig. 3 is a schematic diagram of bonding between a flexible printed circuit board and the flip chip film in the conventional bonding process.

Specifically, the conventional Bonding (Bonding) Process Flow (Process Flow) is: first, an Anisotropic Conductive Film (ACF) 12 is attached to an external Lead Bonding (OLB) region 111 of the OLED panel 11, and an Anisotropic Conductive Film attachment process is completed, as shown in fig. 1. Then, one end of the flip-chip film 21 is bonded to the external lead bonding region 111 through the anisotropic conductive film 12 attached to the external lead bonding region 111, thereby completing the bonding process between the flip-chip film and the OLED panel, as shown in fig. 2. Then, the second anisotropic conductive film 32 is attached to the bonding region 311 of the flexible printed circuit board 31, and then the bonding region 311 of the flexible printed circuit board 31 is bonded to the other end of the flip-chip film 21 through the second anisotropic conductive film 32, so as to complete the bonding process between the flexible printed circuit board and the flip-chip film, and the flexible printed circuit board 31 can be bent to the back of the display panel 11, as shown in fig. 3.

The conductive film mainly comprises two major parts of resin adhesive and conductive particles, and the conduction principle is that the conductive particles are used for connecting electrodes between two components which are jointed to form conduction, and meanwhile, the conduction short circuit between two adjacent electrodes can be avoided, so that the purposes of conduction only in the Z-axis direction and non-conduction in the X and Y directions are achieved.

As a Tool (Tool) is needed in the bonding process, the conductive particles of the anisotropic conductive film are pressed under certain temperature, pressure and time and other process conditions, and then all components are conducted, so that the display function is achieved. The current production flow is limited by the materials of the chip on film and the flexible printed circuit board, and is only suitable for conducting the circuit by generating conductive particles by the hot-pressing anisotropic conductive film. Because the manufacturing process of the conventional flexible printed circuit board is different from that of the chip on film, and the thermal conductivity of the chip on film is relatively higher than that of the flexible printed circuit board, two anisotropic conductive adhesive films are required. Meanwhile, the bonding process between the flip chip film and the flexible printed circuit board is the pressing of two flexible materials, the precision is relatively poor, and the production flow is relatively complex.

Therefore, how to optimize the bonding process between the flip chip film and the flexible printed circuit board, save material and equipment cost, and improve product precision and yield is a problem to be solved.

Disclosure of Invention

The present invention is directed to solve the problems of the prior art, and an object of the present invention is to provide a chip on film and a display device, which can optimize the bonding process between the chip on film and the flexible printed circuit board, save material and equipment costs, and improve the product precision and yield.

In order to achieve the above object, the present invention provides a chip on film, which includes a flexible film, the flexible film including a first surface, the first surface including: a chip bonding region, wherein a chip is arranged in the chip bonding region; and the first connecting end is provided with at least one plug pin, and the plug pin is used for electrically connecting the flexible printed circuit board.

To achieve the above object, the present invention also provides a display device including: a display panel including an external lead connection region; the first connecting end of the chip on film is provided with at least one inserting needle, and the second connecting end of the chip on film is provided with at least one bonding pad; a conductive connection layer electrically connected to the bonding pad on the external lead connection region; and the first connecting end of the flexible printed circuit board is provided with at least one jack, and the inserting needle is inserted into the jack so as to electrically connect the flexible printed circuit board with the chip on film.

The display device has the advantages that in the bonding process of the display device, the flexible printed circuit board and the chip on film are bonded in a plugging mode of matching the plugging pins with the plugging ports, and the bonding between the flexible printed circuit board and the chip on film does not need to use an anisotropic conductive film, so that a hot-pressing tool of the flexible printed circuit board is not needed, conductive particles of the anisotropic conductive film are pressed under the process conditions of certain temperature, pressure time and the like, and the production flow is not limited by the material of the flexible printed circuit board. The display device optimizes the bonding process between the flexible printed circuit board and the chip on film, improves the circuit conduction precision and yield between the flexible printed circuit board and the chip on film, saves the material cost of the anisotropic conductive adhesive film and the equipment cost required by hot pressing, and improves the product precision and yield of the display device.

Drawings

FIG. 1 is a schematic view of an anisotropic conductive film in a conventional bonding process;

FIG. 2 is a schematic view of bonding between a chip on film and an OLED panel in a conventional bonding process;

FIG. 3 is a schematic view of the bonding between a flexible printed circuit board and a chip on film in the conventional bonding process;

FIG. 4 is a schematic view of a display device according to the present invention;

FIG. 5A is a schematic structural diagram of an embodiment of a flip chip on film of the present invention;

FIG. 5B is an enlarged view of the first connecting end of FIG. 5A;

FIG. 6A is a schematic structural diagram of an embodiment of a flexible printed circuit board according to the present invention;

fig. 6B is an enlarged schematic view of the first connection end in fig. 6A.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. The directional phrases used in this disclosure include, for example: up, down, left, right, front, rear, inner, outer, lateral, etc., are simply directions with reference to the drawings. The embodiments described below by referring to the drawings and directional terms used are exemplary only, are used for explaining the present invention, and are not construed as limiting the present invention. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 4, a schematic diagram of a display device according to the present invention is shown. The display device includes: a display panel 41, said display panel 41 comprising an external lead connection area 411; a chip on film 42, the first connection end 421 of the chip on film 42 is provided with at least one plug pin 5121 (shown in fig. 5A), and the second connection end 422 thereof is provided with at least one bonding pad 5131 (shown in fig. 5A); a conductive connection layer 43 electrically connecting the bonding pad 5131 to the external lead connection region 411; and a flexible printed circuit board 44, the first connection end 441 of the flexible printed circuit board 44 is provided with at least one socket 6111 (shown in fig. 6A), and the socket pin 5121 is inserted into the socket 6111, so as to electrically connect the flexible printed circuit board 44 and the chip on film 42.

The display panel 41 may be an OLED panel or an LCD panel, etc., and metal Bonding pads (Bonding pads) are exposed above the external wire Bonding regions 411.

Preferably, the conductive connection layer 43 is an anisotropic conductive film. The conductive film mainly comprises two major parts of resin adhesive and conductive particles, and the conduction principle is that the conductive particles are used for connecting electrodes between two components which are jointed to form conduction, and meanwhile, the conduction short circuit between two adjacent electrodes can be avoided, so that the purposes of conduction only in the Z-axis direction and non-conduction in the X and Y directions are achieved. The conductive particles of the anisotropic conductive film are pressed by using a hot pressing tool under certain processing conditions such as temperature, pressure time and the like, so that each component is conducted.

Specifically, the production flow of the joint of the invention is as follows: the anisotropic conductive film is attached to the external lead connection region 411 of the display panel 41, and the anisotropic conductive film attaching process is completed (refer to fig. 1). Then, the end of the flip chip 42 provided with the bonding pad 5131 is bonded to the external lead bonding area 411 through the anisotropic conductive film, so as to complete the bonding process between the flip chip and the display panel (refer to fig. 2). Then, the alignment Mark (Mark) is captured by manual insertion or an insertion jig to insert the insertion pin 5121 of the chip on film 42 into the insertion port 6111 of the flexible printed circuit board 44, so that the flexible printed circuit board 44 is electrically connected to the chip on film 42, and the bonding process between the flexible printed circuit board and the chip on film is completed to obtain the structure shown in fig. 4.

In the display device bonding process, the flexible printed circuit board and the chip on film are bonded by adopting a pin connection (pin connection) mode in which the plug pins are matched with the plug ports, and the bonding between the flexible printed circuit board and the chip on film does not need to use an anisotropic conductive adhesive film, so that a hot-pressing tool of the flexible printed circuit board is not needed, conductive particles of the anisotropic conductive adhesive film are pressed under the process conditions of certain temperature, pressure time and the like, and the production flow is not limited by the material of the flexible printed circuit board. The display device optimizes the bonding process between the flexible printed circuit board and the chip on film, improves the circuit conduction precision and yield between the flexible printed circuit board and the chip on film, saves the material cost of the anisotropic conductive adhesive film and the equipment cost required by hot pressing, and improves the product precision and yield of the display device.

Referring to fig. 5A-5B, fig. 5A is a schematic structural diagram of a flip chip film according to an embodiment of the invention, and fig. 5B is an enlarged schematic view of the first connection terminals in fig. 5A. The chip on film 42 includes: a flexible film 51; the flexible film 51 includes a first surface 510; the first surface 510 includes a chip bonding area 511 and a first connection end 512. A chip 52 is arranged in the chip bonding region 511; the first connection end 512 is provided with at least one pin 5121, and the pin 5121 is used for electrically connecting to the flexible printed circuit board 44 (shown in fig. 4).

Specifically, the first connection end 512 is further provided with a first pin alignment Mark 5122 and a second pin alignment Mark 5123, wherein the first pin alignment Mark 5122 and the second pin alignment Mark 5123 are respectively disposed at two ends of the area where the plug pin 5121 is located, so that the alignment marks (Mark) can be manually inserted or grasped by an insertion jig for alignment insertion. The first pin alignment mark 5122 and the second pin alignment mark 5123 include a first distance L1 therebetween.

Preferably, the first pin alignment mark 5122 is different in shape from the second pin alignment mark 5123, so that erroneous recognition and erroneous operation can be prevented. The shapes of the two end contraposition marks are not consistent, and the main function is a foolproof function. When manual pressfitting, can avoid maloperation (rotatory 180 degrees) to lead to the grafting needle to damage, or adopt grafting tool automatic pressfitting fashionable, can avoid the grafting needle damage that the misidentification caused.

Specifically, the first surface 510 further includes a second connection terminal 513 thereon, the second connection terminal 513 is provided with at least one bonding pad 5131, and the bonding pad 5131 is used for electrically connecting the display panel. The bonding pad 5131 may be bonded to the external lead bonding area 411 of the display panel 41 by an anisotropic conductive film, so that the flip-chip 42 is electrically connected to the display panel 41.

Specifically, the second connecting end 513 is further provided with a first connection alignment mark 5132 and a second connection alignment mark 5133, wherein the first connection alignment mark 5132 and the second connection alignment mark 5133 are respectively disposed at two ends of the region where the bonding pad 5131 is located, so that the alignment marks can be grasped by a pressing tool for alignment and compression bonding. Preferably, the first connection alignment mark 5132 and the second connection alignment mark 5133 have different shapes, so that the wrong recognition and operation when the pressing tool picks up the alignment mark can be prevented.

Referring to fig. 6A-6B, fig. 6A is a schematic structural diagram of a flexible printed circuit board according to an embodiment of the invention, and fig. 6B is an enlarged schematic view of the first connection terminal in fig. 6A. The flexible printed circuit board 44 includes: a substrate 61; the substrate 61 comprises a first surface 610; the first surface 610 includes a first connection end 611 thereon; the first connection end 611 is provided with at least one socket 6111, and the socket 6111 is adapted to the socket needle 5121 of the chip on film 42 shown in fig. 5A-5B, and is used for accommodating the socket needle 5121. In the process of bonding the flexible printed circuit board and the chip on film, the plug pins 5121 are inserted into the plug ports 6111, so that the flexible printed circuit board 44 and the chip on film 42 are electrically connected.

Specifically, the first connection end 611 is further provided with a first interface alignment Mark 6112 and a second interface alignment Mark 6113, where the first interface alignment Mark 6112 and the second interface alignment Mark 6113 are respectively disposed at two ends of the area where the socket 6111 is located, so that alignment marks (Mark) can be manually plugged or grasped by a plugging jig for alignment plugging.

Preferably, the first interface alignment mark 6112 and the second interface alignment mark 6113 have different shapes, so that misidentification and misoperation can be prevented. The shapes of the two end contraposition marks are not consistent, and the main function is a foolproof function. When manual pressfitting, can avoid maloperation (rotatory 180 degrees) to lead to the grafting needle to damage, or adopt grafting tool automatic pressfitting fashionable, can avoid the grafting needle damage that the misidentification caused.

Specifically, a second distance L2 is included between the first interface alignment mark 6112 and the second interface alignment mark 6113, and the second distance L2 is the same as the first distance L1 shown in fig. 5B, so that the socket 6111 of the flexible printed circuit board 44 is ensured to be matched with the socket pin 5121 of the chip on film 42.

It should be noted that the substrate 61 of the flexible printed circuit board 44 further includes other components required for the circuit board to work, such as components, circuit traces, a Stiffener (Stiffener), and a protective film (protective film), and the arrangement manner thereof may refer to the existing process, and is not described herein again.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.