KR102409704B1 - Flexible film, display panel and display device comprising the same - Google Patents

Abstract

The flexible film according to the present invention includes one or more pad groups and connection leads arranged in the second direction. The pad group includes n (n is a positive number equal to or greater than 2) pads arranged in the first direction. Connection leads extend from the pads. In at least one of the pad groups, the n-row pad is longer in the second direction and shorter in the first direction than the n-1 row pad. In this case, the n-row pad partially overlaps the n-1 row pad.

Description

Flexible film, display panel, and display device including same

The present invention relates to a flexible film having a different pad arrangement structure, a display panel having a different terminal arrangement structure, and a display device including the same.

A video display device that implements a variety of information on a screen is a key technology in the information and communication era, and is developing in the direction of thinner, lighter, portable and high-performance. With the recent development of the information society, various types of demand for display devices have increased, so LCD (Liquid Crystal Display), PDP (Plasma Display Panel), ELD (Electro Luminescent Display), FED (Field Emission Display), OLED ( Research on display devices such as Organic Light Emitting Diode) is being actively conducted.

Drive integrated circuits (ICs) of the flat panel display are mounted on a display panel and connected to data lines (or signal lines) or scan lines (or gate lines). The source drive IC supplies a data signal to the data lines, and the gate drive IC sequentially supplies a scan signal (or gate pulse) synchronized with the data signal to the scan lines.

As a method of mounting the drive ICs on the display panel, a method of bonding a flexible circuit board on which the drive IC is mounted to the display panel, a COG (Chip On Glass) method of directly bonding the drive IC on the substrate, and the like are known. A flexible film for mounting the drive IC includes a chip on film (COF) or a tape carrier package (TCP). Hereinafter, the flexible film will be described with a focus on COF.

Hereinafter, a display device according to the related art will be described with reference to FIGS. 1 to 3 . 1 is a perspective view schematically illustrating a display device according to the related art. 1 to 3 are views for explaining the problems caused by the prior art.

Referring to FIG. 1 , a display device according to the related art includes a display panel 10 , a COF 20 , and an anisotropic conductive film (ACF) 30 layer. The display panel 10 includes a display area AA in which an input image is implemented and a non-display area NA outside the display area AA. The non-display area NA includes connection wires 13 for transmitting a driving signal to the display area AA and terminals 11 connected to one end of the connection wire 13 .

The COF 20 includes a base film 23 and a driver integrated circuit (IC) 21 mounted on the base film 23 . One end of the COF 20 is connected to the display panel 10 , and the other end is connected to a printed circuit board (PCB) (not shown). A plurality of elements such as integrated circuits are formed on the PCB to form a driver, and the driver generates various control signals and data signals for driving the display panel 10 and transmits them to the display panel 10 .

The DIC 21 mounted on the base film 23 transmits a driving signal from the PCB to the display panel 10 through a switching operation. To this end, a transmission path for transmitting a driving signal is formed on the base film 23 . At one end of the base film 23 , the pads 25 are arranged in one row along the column direction, and each pad 25 is electrically connected to the DIC 21 through a connection lead 27 .

The ACF layer 30 includes an adhesive resin and conductive particles dispersed therein. The ACF layer 30 is disposed between the terminals 11 of the display panel 10 and the pads 25 of the COF 20 , and conductive particles are connected to each other by heat compression to form the terminals of the display panel 10 . (11) and the pads 25 of the COF (20) are electrically connected.

2 and 3 , each of the pads 25 of the COF 20 considers alignment with the terminals 11 provided in the display panel 10 and process deviation, In order to prevent poor contact with the terminals 11, it is necessary to secure a sufficient contact area. Accordingly, the COF 20 must be formed to have sufficient width W and length L. Also, the pads 25 and the terminals 11 are connected in one direction (or in a vertical direction) ID1 through the conductive balls 31 included in the ACF layer 30 . However, when the spacing between the adjacent pads 25 is not sufficiently secured, the pad 25 and the terminal 11 in the other direction ID2 are connected to each other, and a connection failure may occur. Accordingly, the pads 25 should be formed to have a sufficient distance from the adjacent pads 25 .

Recently, in order to reduce the cost of the COF 20 , the total area of the COF 20 is reduced, and the number of output pads 25 for transmitting a driving signal to the display panel 10 increases due to an increase in resolution. Accordingly, there is a structural problem in that all pads 25 must be disposed within the limited area of the COF 20 while satisfying the above-mentioned constraint conditions. Since it is difficult to solve this problem with the conventional structure in which the pads 25 are arranged in one row along the column direction, the development of a new pad arrangement structure is required.

The present invention provides a flexible film having improved space utilization by changing a pad arrangement structure and a display device including the same.

In order to achieve the above object, the flexible film according to the present invention includes one or more pad groups arranged in the second direction. The pad group includes n pads arranged in the first direction. The n-row pad is longer in the second direction and shorter in the first direction than the n-1 row pad. The n row pad partially overlaps the n-1 row pad.

The flexible film according to the present invention includes one or more pad groups arranged in the second direction. The pad group includes n pads arranged in the first direction and m symmetrical pads arranged in the first direction. The m-row symmetrical pad has a shape in which the n-row pad is symmetrical with respect to the first axis. The first axis means an axis extending in the first direction.

A display device according to the present invention includes a flexible film and a display panel. The display panel includes one or more terminal groups arranged in the second direction. The terminal group includes n terminals arranged in the first direction. The n-row pad and the n-row terminal have a mirror image relationship.

A display device according to the present invention includes a flexible film and a display panel. The display panel includes one or more terminal groups arranged in the second direction. The terminal group includes n terminals arranged in the first direction. The terminal group includes m symmetric terminals arranged in the first direction. The m-row symmetrical terminal has a shape in which the n-row terminal is symmetrical with respect to the first axis. The first axis means an axis extending in the first direction. The n-row pad and the n-row terminal have a mirror image relationship. The m-row symmetrical pad and the m-row symmetrical terminal have a mirror image relationship.

In the present invention, pads arranged in a first direction are defined as a pad group, and one or more pad groups are arranged in a second direction. Accordingly, according to the present invention, a relatively large number of pads having a minimum distance and a minimum connection area possible in a process can be disposed in a limited space of the flexible film. The present invention can efficiently utilize the limited space of the flexible film by changing the arrangement structure of the pads and the terminals.

1 is a perspective view schematically illustrating a display device according to the related art.
2 and 3 are diagrams for explaining the problems caused by the prior art.
4 is a perspective view schematically illustrating a display device according to the present invention.
5 is a view for explaining the structure of the pad group and the terminal group according to the first embodiment of the present invention, and is an enlarged view of the pad group and the terminal group area in FIG. 4 .
6 is a view for explaining the arrangement structure of pads and terminals according to the first embodiment of the present invention, and is an enlarged view of some pads and terminals in FIG. 5 .
7 is a view for explaining the structures of the pad group PG and the terminal group DG according to the second embodiment of the present invention, and is an enlarged view of the pad group PG and the terminal group DG in FIG. 4 . it is one drawing
8 and 9 are diagrams for explaining a display device according to a third embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numerals refer to substantially identical elements throughout. In the following description, if it is determined that a detailed description of a known technology or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the component names used in the following description may be selected in consideration of ease of writing the specification, and may be different from the component names of the actual product.

The display device of the present invention includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic light emitting diode display (OLED). , OLED Display), and can be implemented as a display device such as an electrophoresis (EPD). Hereinafter, a case in which the display panel includes an organic light emitting diode device will be described as an example, but it should be noted that the present invention is not limited thereto.

Hereinafter, a flexible film and a display device including the same according to the present invention will be described with reference to FIG. 4 . 4 is a perspective view schematically illustrating a display device according to the present invention.

4 , the display device according to the present invention includes a flexible film 120 , a display panel 110 , and an anisotropic conductive film (ACF) 130 interposed between the flexible film 120 and the display panel 110 . include layers.

The flexible film 120 includes a base film 123 and a transmission path provided on the base film 123 to transmit a driving signal to the display panel 110 . A driver integrated circuit (hereinafter, referred to as 'DIC 121 ') may be mounted on the base film 123 . In FIG. 4 , the case in which the DIC 121 is mounted on the flexible film 120 is illustrated as an example, but the present invention is not limited thereto, and the DIC 121 may be omitted on the base film 123 . The flexible film 120 may include a chip on film (COF), a tape carrier package (TCP), a flexible printed circuit (FPC), and the like. Hereinafter, a case in which the flexible film 120 is COF will be described as an example.

The flexible film 120 includes a base film 123 and a DIC 121 mounted on the base film 123 . One end of the flexible film 120 is connected to the display panel 110 , and the other end is connected to a printed circuit board (hereinafter referred to as 'PCB') (not shown). A plurality of devices such as integrated circuits are formed on the PCB to form a driving unit, and the driving unit generates various signals for driving the display panel 110 , for example, a gate signal and/or a data signal, and transmits it to the display panel 110 . transmit

The DIC 121 mounted on the base film 123 transmits a driving signal from the PCB to the display panel 110 through a switching operation. To this end, a transmission path for transmitting a driving signal is formed on the base film 123 .

At least one pad group PG is arranged at one end of the base film 123 in parallel in the second direction. At least one pad group PG disposed on the base film 123 includes n (n is a positive number greater than or equal to 2) pads 125 separated and arranged in the first direction. Each of the pads 125 included in the pad group PG is electrically connected to the DIC 121 through a connection lead 127 connected to the pad 125 to transmit a driving signal to the display panel 110 . The configuration of the pads 125 included in at least one pad group PG will be described in detail below through preferred embodiments of the present invention. Hereinafter, a case in which the first direction is the row direction (or the Y-axis direction) and the second direction is the column direction (or the X-axis direction) will be described as an example.

In the flexible film 120 according to the present invention, n pads 125 arranged in a row direction are defined as one pad group PG, and at least one pad group PG is arranged in a column direction, whereby limited flexibility A larger number of pads 125 may be provided within the area of the film 120 than in the prior art. That is, in the present invention, even under the same conditions as in the prior art within the limited area of the flexible film 120, for example, the same pad 125 area and the same spacing between the pads 125, more pads 125 compared to the prior art. may include Accordingly, the present invention can efficiently utilize the space of the flexible film 120 required to form the pad 125 .

The display panel 110 includes a display area AA in which an input image is implemented and a non-display area NA outside the display area AA.

The display area AA includes pixels formed in a pixel area defined by data lines and gate lines. Each of the pixels includes an organic light emitting diode (hereinafter referred to as 'OLED'), which is a self-luminous device. The OLED includes an anode electrode and a cathode electrode, and an organic compound layer interposed therebetween. The organic compound layer includes an emission layer (EML) and may further include a common layer. The common layer is at least one selected from the group of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). may include more than one.

Each of the pixels is a driving thin film transistor (hereinafter referred to as TFT) that controls the driving current flowing through the OLED according to the gate-source voltage, and a storage that maintains the gate-source voltage of the driving TFT constant for one frame. It may include a storage capacitor, and at least one switch TFT configured to program a gate-source voltage of the driving TFT in response to a gate pulse (or scan pulse). The driving current is determined by the gate-source voltage of the driving TFT according to the data voltage and the threshold voltage of the driving TFT, and the luminance of the pixel is proportional to the size of the driving current flowing through the OLED.

The non-display area NA includes connection wirings 117 for transferring signals to data lines and/or gate lines, and terminals 115 connected to one end of the connection wiring 117 .

At one end of the display panel 110 , at least one terminal group DG is arranged in parallel in a column direction. At least one terminal group DG includes n (n is a positive number equal to or greater than 2) number of terminals 115 arranged in a row direction. Each terminal 115 included in the terminal group DG is electrically connected to data lines and/or gate lines of the display area AA through connection wires 117 connected to the terminals 115 . The terminals 115 are in mirror image symmetry with the pads 125 and are bonded to each other. The configuration of the terminals 115 included in the terminal group DG will be described in detail below through preferred embodiments of the present invention. It should be noted that the technical spirit of the present invention is not limited by the following examples.

<First embodiment>

Hereinafter, a flexible film and a display device including the same according to a first embodiment of the present invention will be described with reference to FIGS. 5 and 6 . 5 is a view for explaining the structure of the pad group and the terminal group according to the first embodiment of the present invention, and is an enlarged view of the pad group and the terminal group area in FIG. 4 . 6 is a view for explaining the arrangement structure of pads and terminals according to the first embodiment of the present invention, and is an enlarged view of some pads and terminals in FIG. 5 .

5 and 6 , the display device according to the first exemplary embodiment includes an electrically connected flexible film 120 and a display panel 110 . The flexible film 120 is bonded to one end of the display panel 110 .

The flexible film 120 includes one or more pad groups PG arranged in a column direction. The pad group PG includes n (n is a positive number greater than or equal to 2) pads arranged in a row direction. Hereinafter, a structure of the pads disposed in at least one of the pad groups PG arranged in the column direction will be described.

The n pads 101 to 104 arranged in the pad group PG are arranged in a row direction. Hereinafter, a pad disposed at the most distal end of the flexible film 120 is defined as an n-row pad, and a pad disposed most spaced apart from the n-row pad and disposed close to the DIC 121 or PCB is defined as a 1-row pad. Although the drawing shows a structure in which four pads are arranged in a row direction in one pad group PG, it should be noted that the present invention is not limited thereto.

The n-row pad is longer than the n-1 row pad in the column direction (hereinafter referred to as a 'width') and has a shorter length in the row direction (hereinafter referred to as a 'length'). For example, the width E of the 3-row pad 103 is longer than the width C of the 2-row pad 102 . The width C of the two-row pad 102 is longer than the width A of the one-row pad 101 . The length F of the third row pad 103 is shorter than the length D of the second row pad 102 . The length D of the two-row pad 102 is shorter than the length B of the one-row pad 101 .

Each of the pads 101 to 104 considers alignment and process deviation with the terminals 1101 to 1104 provided in the display panel 110 , and reduces poor contact with the terminals 1101 to 1104 . It is formed to have a sufficient contact area to prevent it. Accordingly, the pads 101 to 104 arranged in the row direction in one pad group PG may have different widths and lengths, but may have the same area. In this case, the area of the pads 101 to 104 may be the minimum area capable of preventing contact failure with the respective terminals 1101 to 1104 . For example, the pad may have a minimum connection area that can be secured in consideration of misalignment that may occur during the ACF process.

The n-row pad partially overlaps on the same plane as the n-1 row pad. Each of the pads 101 to 104 includes one side extending in the row direction (hereinafter referred to as a 'first vertical side') (AL1-1, AL2-1) and the other side extending in the row direction (hereinafter, ' 'second vertical side') (AL1-2, AL2-2), one side extending in a column direction (hereinafter referred to as a 'first horizontal side') (HL1-1, HL2-1), and a column direction and the other side (hereinafter, referred to as a 'second horizontal side') extending to HL1-2 and HL2-2. The n-row pad 104 overlaps the first vertical side AL2-1 of the n-1 row pad 103 , and the n-row pad 104 has the second vertical side AL2-1 of the n-1 row pad 103 . It does not overlap with AL2-2). The n-row pad 104 does not completely overlap the n-1 row pad 103 and is shifted by a predetermined interval in the column direction.

Each of the pads 103 and 104 is connected to the DIC 121 through connection leads 113 and 114 extending in the row direction. The widths G1 and G2 of the connection leads 113 and 114 connected to the respective pads 103 and 104 may be the same, and at least one width G1 is equal to the width G2 of the other. They may have different widths. The connection leads 114 connected to the n-row pads 104 extend in the row direction so as not to overlap the n-1 row pads 103 . The connection lead 114 connected to the n-row pad 104 is spaced apart from the connection lead 113 connected to the n-1 row pad 103 by a predetermined interval H1 so as not to be shorted. The predetermined interval H1 is the minimum interval at which the connection lead 114 connected to the n-row pad 104 and the connection lead 113 connected to the n-1 row pad 103 do not short-circuit each other in consideration of the process margin. desirable.

The connection leads 113 and 114 may be respectively connected to the first vertical sides AL2-1 and AL1-1 of the corresponding pads 103 and 104 . The first vertical sides AL2-1 and AL1-1 may be portions having the largest contact area capable of making contact with the connection leads 113 and 114 . Accordingly, in the present invention, by connecting the connecting leads 113 and 114 to the first vertical sides AL2-1 and AL1-1, poor contact between the pads 103 and 104 and the connecting leads 113 and 114 can be prevented. have.

The interval I between the first vertical side AL1-1 of the n-row pad 104 and the first vertical side AL2-1 of the n-1 row pad 103 is the n-1 row pad 103 ) is greater than the width G2 of the connection lead 113 connected to one side. That is, the interval I between the first vertical side AL1-1 of the n-row pad 104 and the first vertical side AL2-1 of the n-1 row pad 103 is the n-1 row pad A gap through which the connecting lead 113 connected to one side of the 103 can pass is sufficient.

The n-row pad 104 is formed to be spaced apart from the n-1 row pad 103 by a predetermined distance J. The preset distance J may be a minimum distance capable of preventing aggregation of conductive balls during the ACF process. That is, when a conductive ball aggregation phenomenon occurs, a short-circuit failure may occur between the adjacent pads 103 and 104 , so that the second horizontal side HL1-2 of the n-row pad 104 is in the n-1 row. It is disposed to be spaced apart from the first horizontal side HL2-1 of the pad 103 by a preset distance J.

The display panel 110 includes one or more terminal groups DG arranged in a column direction. The terminal groups DG are disposed at one end of the display panel 110 and are bonded to the pad groups PG disposed on the flexible film. The terminal group DG includes n (n is a positive number greater than or equal to 2) terminals 1101 to 1104 arranged in a row direction. Hereinafter, structures of the terminals 1101 to 1104 disposed in at least one terminal group DG among the terminal groups DG arranged in the column direction will be described.

The n terminals 1101 to 1104 disposed in the terminal group DG correspond to the n pads 101 to 104 disposed in the pad group PG and are bonded to each other. The n terminals 1101 to 1104 arranged in the terminal group DG are arranged in a row direction. Hereinafter, when the pads 101 to 104 of the flexible film 120 and the terminals 1101 to 1104 of the display panel 110 are bonded to each other, a terminal in contact with the n-row pad is defined as an n-row terminal. Although the drawing shows a structure in which four terminals 1101 to 1104 are arranged in a row direction in one terminal group DG, it should be noted that the present invention is not limited thereto.

Since the terminals 1101 to 1104 have a mirror image relationship with the pads 101 to 104 bonded thereto, the shape of the n-row terminals bonded to each other is substantially the same as the shape of the n-row pads. That is, the terminals 1101 in one row and the pads 101 in one row have the same area. Terminals 1102 in row 2 and pads 102 in row 2 have the same area. The terminals 1103 in row 3 and the pad 103 in row 3 have the same area. The terminals 1104 in row 4 and the pad 104 in row 4 have the same area.

The n-row terminal is wider and shorter than the n-1 row terminal. The n-row terminal partially overlaps the n-1 row terminal. Each of the terminals 1101 to 1104 includes one side extending in the row direction, the other side extending in the row direction, one side extending in the column direction, and the other side extending in the column direction. When the pads 103 and 104 and the terminals 1103 and 1104 are bonded to each other, the terminals 1103 corresponding to (or in contact with) the first vertical sides AL2-1 and AL1-1 of the pads 103 and 104 . , 1104) is defined as first vertical sides MAL2-1 and MAL1-1. The second vertical sides AL2-2 and AL1-2 of the pads 103 and 104 and the other side of the terminals 1103 and 1104 corresponding to the pads 103 and 104 are defined as second vertical sides MAL2-2 and MAL1-2. One side of the terminals 1103 and 1104 corresponding to the first horizontal sides HL2-1 and HL1-1 of the pads 103 and 104 are defined as first horizontal sides MHL2-1 and MHL1-1. The other side of the terminal corresponding to the second horizontal sides HL2-2 and HL1-2 of the pads 103 and 104 is defined as second vertical sides MHL2-2 and MHL1-2.

The n-row terminal 1104 overlaps the first vertical side MAL2-1 of the n-1 row terminal 1103 , and the n-row terminal 1104 has the second vertical side MAL2-1 of the n-1 row terminal 1103 . It does not overlap with MAL2-2). The n-row terminal 1104 does not completely overlap the n-1 row terminal 1103, and is disposed with a predetermined interval shift in the column direction.

Each of the terminals 1103 and 1104 is connected to gate lines and/or data lines through connection wirings 1113 and 1114 extending in the row direction. The widths G3 and G4 of the connection wires 1113 and 1114 connected to the terminals 1103 and 1104 may all be the same, and at least one width G3 is different from the other width G4. can have The connection wiring 1113 connected to the n-1 row terminal 1103 extends in the row direction so as not to overlap the n-row terminal 1104 .

The connecting wires 1113 and 1114 are disposed so as not to overlap the connecting leads 113 and 114 when the terminals 1103 and 1104 and the pads 103 and 104 are joined. For example, when the connecting lead 114 connected to the n-row pad 104 is connected to the first vertical side AL1-1 of the n-row pad 104, the connecting wire ( 1114 is connected to the second vertical side MAL1 - 2 of the n-row terminal 1104 .

The connection wiring 1114 connected to the n-row terminal 1104 is disposed to be spaced apart from the connection wiring 1113 connected to the n-1 row terminal 1103 by a predetermined interval H2 so as not to be short-circuited. The predetermined interval H2 is the minimum interval in which the connection wiring 1114 connected to the n-row terminal 1104 and the connection wiring 1113 connected to the n-1 row terminal 1103 do not short-circuit each other in consideration of the process margin. desirable.

The connection wires 1113 and 1114 may be respectively connected to the second vertical sides MAL1 - 2 and MAL2 - 2 of the corresponding terminals 1103 and 1104 . The second vertical sides MAL1 - 2 and MAL2 - 2 may be portions having the largest contact area capable of making contact with the connection wires 1113 and 1114 . Accordingly, in the present invention, by connecting the connecting wires 1113 and 1114 to the second vertical sides MAL1-2 and MAL2-2, contact failure between the terminals 1103 and 1104 and the connecting wires 1113 and 1114 can be prevented. have. In addition, the interval between the connection wiring 1113 of the n-1 row terminal and the n-row terminal 1104 is that the connection wiring 1113 connected to the n-1 row terminal 1103 is the n-1 row terminal 1103 . It is widest when connected to the second vertical side MAL2-2. As described above, by maximally spaced apart the distance between the connection wiring 1113 of the n-1 row terminal 1103 and the n-1 row terminal 1104, misalignment occurs when the terminal 1104 and the pad 104 are bonded. Even so, it is possible to minimize the problem of a short circuit occurring between the connection line 1113 connected to the n-1 row terminal 1103 and the n-row pad 104 .

The distance K between the second vertical side MAL1-2 of the n-row terminal 1104 and the second vertical side MAL2-2 of the n-1 row terminal 1103 is at the n-row terminal 1104 It is larger than the width G3 of the connected connection line 1114 . That is, the distance K between the second vertical side MAL1-2 of the n-row terminal 1104 and the second vertical side MAL2-2 of the n-1 row terminal 1103 is the n-row terminal 1104 ), a gap through which the connecting wire 1114 connected to one side can pass is sufficient.

The n-row terminal 1104 is formed to be spaced apart from the n-1 row terminal 1103 by a predetermined distance (J). The preset distance J may be a minimum distance capable of preventing aggregation of conductive balls during the ACF process. That is, when a conductive ball aggregation phenomenon occurs, a short-circuit failure may occur between the adjacent terminals 1103 and 1104 . Therefore, the second horizontal side MHL1-2 of the n-row terminal 1104 is located in the n-1 row. It is disposed to be spaced apart from the first horizontal side MHL2-1 of the terminal 1103 by a preset distance J.

In the present invention, pads arranged in a row direction are defined as a pad group PG, and one or more pad groups PG are arranged in a column direction. Accordingly, according to the present invention, a relatively large number of pads having a minimum distance and a minimum connection area possible in a process can be disposed within the limited space of the flexible film 120 . In addition, the present invention can efficiently use the limited space of the flexible film 120 by changing the arrangement structure of the pads and the terminals as described above. Accordingly, the present invention can provide an improved pad arrangement structure for disposing a plurality of pads within a limited area of the flexible film 120 .

<Second embodiment>

Hereinafter, the flexible film 120 and a display device including the same according to a second embodiment of the present invention will be described with reference to FIG. 7 . 7 is a view for explaining the structures of the pad group PG and the terminal group DG according to the second embodiment of the present invention, and is an enlarged view of the pad group PG and the terminal group DG in FIG. 4 . it is one drawing

Referring to FIG. 7 , the display device according to the second exemplary embodiment includes an electrically connected flexible film 120 and a display panel 110 . The flexible film 120 is bonded to one end of the display panel 110 .

The flexible film 120 includes one or more pad groups PG arranged in a column direction. Hereinafter, a structure of the pads disposed in at least one of the pad groups PG arranged in the column direction will be described.

The pad group PG includes n (n is a positive number greater than or equal to 2) pads 101 to 104 arranged along the row direction, and connection leads extending along the row direction from one side of the n pads 101 to 104 These include (111 to 114). The pads 101 to 104 disposed in the pad group PG are substantially the same as the pad structure described in the first embodiment. Accordingly, in describing the second embodiment of the present invention, a detailed description of the pad structure included in the pad group PG will be omitted.

The pad group PG includes m (m=n) symmetrical pads 201 to 204 , and connection leads 211 to 214 extending along the row direction from one side of the m symmetrical pads 201 to 204 . further includes The m symmetrical pads 201 to 204 and the connection leads 211 to 214 connected thereto have the m pads 101 to 104 and the connection leads 111 to 114 connected thereto on a first axis AX1 . has a symmetrical shape based on The first axis AX1 refers to an axis extending in the row direction.

Accordingly, the shapes of the n-row pad and the m-row symmetric pad are substantially the same. That is, the 1-row pad 101 has the same shape as the 1-row symmetrical pad 201 . The two-row pad 102 has the same shape as the two-row symmetrical pad 202 . The three-row pad 103 has the same shape as the three-row symmetrical pad 203 . The four row pad 104 has the same shape as the four row symmetric pad 204 . Connection leads 211 to 214 extending in the row direction are respectively connected to one side of the symmetrical pads 201 to 204 . The connection leads 211 to 214 may be connected to one side of the symmetric pads 201 and 204 .

The spacing L1 between the n-row pad 104 and the m-row symmetric pad 204 is wider than the spacing L2 between the n-1 row pad 103 and the m-1 row symmetric pad 203 . As will be described later, the distance L1 between the n-row pad 104 and the m-row symmetrical pad 204 is 1 to 1 ~m It is characterized in that it is larger than the width of the connecting wires 1211 to 1214 connected to the other side of the row symmetric terminals 1201 to 1204.

The display panel 110 includes one or more terminal groups DG arranged in a column direction. Hereinafter, a structure of the terminals disposed in at least one terminal group DG among the terminal groups DG arranged in the column direction will be described.

The terminal group DG includes n (n is a positive number greater than or equal to 2) terminals 1101 to 1104 arranged along the row direction, and a connection wiring extending along the row direction from one side of the n terminals 1101 to 1104 1111 to 1114 are included. The terminal group DG further includes m symmetric terminals 1201 to 1204 and connection wires 1211 to 1214 extending from one side of the m symmetric terminals 1201 to 1204 in a row direction. The m number of symmetrical terminals 1201 to 1204 and the connection wires 1211 to 1214 connected thereto are the m terminals 1101 to 1104 and the connection wires 1111 to 1114 connected thereto along the first axis AX1. has a symmetrical shape based on The first axis AX1 refers to an axis extending in the row direction. The spacing L1 between the n-row terminal 1104 and the m-row symmetric terminal 1204 is wider than the spacing L2 between the n-1 row terminal 1103 and the m-1 row symmetric terminal 1203 .

The n terminals 1101 to 1104 and the m symmetric terminals 1201 to 1204 arranged in the terminal group DG include n pads 101 to 104 and m symmetric terminals 1201 to 1204 arranged in the pad group PG. Corresponding to the symmetrical pads 201 to 204 , the n pads 101 to 104 and the m symmetrical pads 201 to 204 are bonded to each other.

Since the terminals 1101 to 1104 have a mirror image relationship with the pads 101 to 104 bonded thereto, the shape of the n-row terminals bonded to each other is substantially the same as the shape of the n-row pads. That is, the terminals 1101 in one row and the pads 101 in one row have the same area. The terminals 1102 in row 2 and the pad 102 in row 2 have the same area. The terminals 1103 in row 3 and the pad 103 in row 3 have the same area. The terminals 1104 in row 4 and the pad 104 in row 4 have the same area.

Since the symmetric terminals 1201 to 1204 have a mirror image relationship with the symmetric pads 201 to 204 bonded thereto, the shape of the n-row symmetric terminals bonded to each other is substantially the same as that of the n-row symmetric pads. That is, the symmetric terminals 1201 in one row and the symmetric pads 201 in one row have the same area. The symmetric terminals 1202 in two rows and the symmetric pads 202 in two rows have the same area. The symmetric terminals 1203 in 3 rows and the symmetric pads 203 in 3 rows have the same area. The symmetric terminals 1204 in 4 rows and the symmetric pads 204 in 4 rows have the same area.

The spacing L1 between the n-row pad 104 and the m-row symmetric pad 204 is wider than the spacing L2 between the n-1 row pad 103 and the m-1 row symmetric pad 203 . The spacing L1 between the n-row terminal 1104 and the m-row symmetric terminal 1204 is wider than the spacing L2 between the n-1 row terminal 1103 and the m-1 row symmetric terminal 1103 . The spacing L1 between the n-row pad 104 and the m-row symmetrical pad 204 and the spacing L1 between the n-row terminal 1104 and the m-row symmetrical terminal 1204 are 1 to n-row terminals 1101 The widths of the connecting wires 1111 to 1114 connected to the other side of ˜1104 and the connecting wires 1211 to 1214 connected to the other side of the 1-m row symmetric terminals 1201 to 1204 are larger than the width. That is, the distance L1 between the n-row pad 104 and the m-row symmetrical pad 204 and the gap L1 between the n-row terminal 1104 and the m-row symmetrical terminal 1204 take the process margin into consideration. Thus, the connecting wires 1111 to 1114 connected to the other side of the 1 to n row terminals 1101 to 1104 and the connecting wires 1211 to 1214 connected to the other side of the 1 to m row symmetric terminals 1201 to 1204 pass through It is desirable to form it to have the smallest possible spacing.

In the present invention, pads arranged in a row direction are defined as a pad group PG, and one or more pad groups PG are arranged in a column direction. Accordingly, according to the present invention, a relatively large number of pads having a minimum distance and a minimum connection area possible in a process can be disposed within the limited space of the flexible film 120 . In addition, the present invention can efficiently use the limited space of the flexible film 120 by changing the arrangement structure of the pads and the terminals as described above. Accordingly, the present invention can provide an improved pad arrangement structure for disposing a plurality of pads within a limited area of the flexible film 120 .

<Third embodiment>

Hereinafter, a display device according to a third embodiment of the present invention will be described with reference to FIGS. 8 and 9 . 8 and 9 are diagrams for explaining a display device according to a third embodiment of the present invention.

The display device according to the third exemplary embodiment of the present invention includes a display panel 110 and a flexible film 120 bonded to one end of the display panel 110 . The structures of the display panel 110 and the flexible film 120 are substantially the same as those described in the first and second exemplary embodiments.

Referring to FIG. 8 , the terminals of the display panel 110 and the pads of the flexible film 120 are bonded to each other with an ACF (AL) layer interposed therebetween. The terminals of the display panel 110 are bonded to the pads of the flexible film 120 through the ACF (AL) layer. The ACF (AL) layer includes an adhesive resin (AD) and conductive balls (CP) dispersed therein. The ACF (AL) layer is disposed between the terminals of the display panel 110 and the pads of the flexible film 120 . The conductive balls CP are selectively connected by heat compression to connect the terminals of the display panel 110 and the pads of the flexible film 120 in a one-to-one correspondence.

In the structure of the pad group PG disclosed in the preferred embodiments of the present invention, the spacing between adjacent pads is preferably formed to have a minimum distance capable of preventing short-circuit failure. Therefore, when using the conventional ACF including the scattered conductive balls CP, there is a limit in reducing the spacing between the neighboring pads. That is, when the scattered conductive balls CP are used, aggregation of the conductive balls CP may occur between the adjacent pads DFA, and accordingly, there is a problem in that a short circuit occurs between the adjacent pads.

Therefore, referring to FIG. 9 , the present invention uses an ACF (AL) layer in which conductive balls (CP) are spaced apart at regular intervals and distributed. In this ACF (AL) layer, since the conductive balls CP are not dispersed and a constant distance is maintained, the aggregation of the conductive balls CP can be prevented even when neighboring pads have a relatively narrow gap. have.

Those skilled in the art through the above description will be able to make various changes and modifications without departing from the technical spirit of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

110: display panel 120: flexible film
PG: Pad group DG: Terminal group
101, 102, 103, 104: pad 111, 112, 113, 114: connection lead
1101, 1102, 1103, 1104: terminal
1111, 1112, 1113, 1114: connecting wiring
201, 202, 203, 204: Symmetrical pads 211, 212, 213, 214: Connecting leads
1201, 1202, 1203, 1204: Symmetrical terminals
1211, 1212, 1213, 1214: connecting wiring

Claims (17)

a base film having an attachment region attached to the display panel along a width direction and extending in a longitudinal direction perpendicular to the width direction;
one or more pad groups disposed on the base film, including n (n is a positive number of 2 or more) pads separately arranged in the longitudinal direction, and arranged in the width direction; and
connection leads extending from the pads;
In at least one of the pad groups,
The length of the pad increases in the longitudinal direction from the attachment region and the width decreases so that the n pads of the pad group have the same area. The method of claim 1,
The n pads arranged in the longitudinal direction are,
Each has one side extending in the longitudinal direction and the other side extending in the longitudinal direction,
One side of the n-1 th pad overlaps the n th pad,
The other side of the n-1 th pad is a flexible film that does not overlap the n th pad. 3. The method of claim 2,
The connection leads are connected to one side of the pads,
The interval between one side of the n-th pad and one side of the n-1 th pad is,
A flexible film greater than a width of the connection lead connected to one side of the n-1 th pad. 3. The method of claim 2,
At least one of the pad group,
Further comprising m symmetrical pads having a shape symmetrical to the n pads with respect to the first axis extending in the longitudinal direction,
The distance between the n-th pad and the m-th symmetric pad is,
A flexible film wider than the gap between the n-1 th pad and the m-1 th symmetric pad. delete display panel; and
a flexible film bonded to one end of the display panel;
The flexible film,
A base film having an attachment region attached to the display panel along the width direction and extending along the longitudinal direction perpendicular to the width direction
one or more pad groups disposed on the base film and including n (n is a positive number of 2 or more) pads arranged in the longitudinal direction and arranged in the width direction; and
Connecting leads extending in a first direction from the pads,
In at least one of the pad groups,
The length of the pad increases in the longitudinal direction from the attachment region and the width decreases so that the n pads of the pad group have the same area,
The display panel is
at least one terminal group including n terminals connected to the pads to correspond to the pads;
and connecting wires extending in the lengthwise direction from the terminals. 7. The method of claim 6,
The n pads arranged in the longitudinal direction and n terminals bonded thereto are
Each has one side extending in the longitudinal direction and the other side extending in the first direction,
One side of the n-1 th pad overlaps the n th pad,
The other side of the n-1 th pad does not overlap with the n th pad,
One side of the n-1 th terminal overlaps the n th terminal,
The other side of the n-1 th terminal does not overlap the n th terminal. 8. The method of claim 7,
The connection leads are respectively connected to the one side of the pads,
The connecting wires are respectively connected to the other side of the terminals,
The interval between one side of the n-th pad and one side of the n-1 th pad is,
greater than the width of the connection lead connected to one side of the n-1 th pad,
The distance between the other side of the n-th terminal and the other side of the n-1 th terminal is,
A display device having a width greater than a width of a connecting wire connected to the other side of the n-th terminal. 8. The method of claim 7,
At least one of the pad group,
Further comprising m symmetrical pads having a shape symmetrical to the n pads with respect to the first axis extending in the longitudinal direction,
The distance between the n-th pad and the m-th symmetric pad is,
The display device is wider than an interval between the n-1 th pad and the m-1 th symmetric pad. 10. The method of claim 9,
Further comprising m symmetric terminals having a shape symmetrical to the n terminals with respect to the first axis extending in the longitudinal direction,
The connection wires are respectively connected to the other side of the terminals and the symmetric terminals,
The m symmetrical terminals correspond to the m symmetrical pads,
The distance between the n-th pad and the m-th symmetric pad is,
The width of the connecting wires connected to the other side of the 1 to n-th terminals and the connecting wires connected to the other side of the 1 to m-th symmetric terminals is greater than a width of the display device. 7. The method of claim 6,
Further comprising an ACF (Anisotropic Conductive Film) layer provided between the pads and the terminals and having conductive balls selectively connecting the pads and the terminal;
The conductive balls are spaced apart from each other at regular intervals. one or more terminal groups including n (n is a positive number greater than or equal to 2) terminals arranged in a first direction perpendicular to a second direction along an edge and arranged in a second direction; and
including connecting wires extending from the terminals;
In at least one of the terminal groups,
The length of the terminal increases in the longitudinal direction from the edge and the width decreases such that the n terminals of the terminal group have the same area. 13. The method of claim 12,
The n terminals arranged in the first direction are
each having one side extending in the first direction and the other side extending in the first direction,
One side of the n-1 th terminal overlaps the n th terminal,
The other side of the n-1 th terminal does not overlap the n th terminal. 14. The method of claim 13,
The connecting wires are connected to the other side of the terminals,
The distance between the other side of the n-th terminal and the other side of the n-1 th terminal is,
A display panel having a width greater than a width of the connection wire connected to the other side of the n-th terminal. 14. The method of claim 13,
At least one of the terminal groups,
Further comprising m symmetric terminals having a shape symmetrical to the n terminals with respect to a first axis extending in the first direction,
The distance between the n-th terminal and the m-th symmetrical terminal is,
A display panel wider than a gap between the n-1 th terminal and the m-1 th symmetric terminal. delete The display device of claim 6 , wherein the pads of the flexible film and the terminals of the display panel corresponding to each other have the same shape.

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