KR20030050830A - Display panel and flexible cable film - Google Patents

Abstract

PURPOSE: A display panel and a flexible cable film are provided to prevent poor connection between a display panel and a flexible cable film. CONSTITUTION: A display panel is connected to the first terminals(211) of a flexible cable film(200) electrically connected to a circuit board to display an image according to a video signal from the circuit board. The display panel includes a display unit for displaying images, and the second terminals(115) formed around the display unit at a specific interval. The second terminals connect the display unit with the first terminals of the flexible cable film. The second terminals have a plurality of protrusions(115a) for preventing poor connection of the first terminals and the second terminals. Each of the protrusions is extended from the end of each of the second terminals in the direction in which the flexible cable film is expanded by heat.

Description

Display panel and flexible cable film {DISPLAY PANEL AND FLEXIBLE CABLE FILM}

The present invention relates to a display panel and a flexible cable, and more particularly to a display panel and a flexible cable that can prevent a poor connection between the display panel and the flexible cable.

In today's information society, the role of display devices is becoming increasingly important, and various display devices are widely used in various industrial fields. Due to the rapid progress of semiconductor technology, as the size and weight of various information processing devices are reduced, a flat panel display device having thin and light display devices and low power consumption has been developed.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display includes two substrates on which electrodes are formed and a liquid crystal interposed therebetween. The liquid crystal molecules are rearranged by applying a voltage to the electrode. It is a device that performs display by adjusting the amount of transmitted light.

In general, a liquid crystal display device needs to convert image data applied from a printed circuit board into a drive signal suitable for driving a liquid crystal display panel in order to display an image using the liquid crystal display panel, and also to adjust the drive signal at an appropriate timing. It should be applied to the liquid crystal display panel.

In order to implement this, the liquid crystal display requires a process of signal processing in the driving chip before the image data is applied to the liquid crystal display panel. That is, the driving chip is connected to the printed circuit board to apply the image data from the printed circuit board to the data line and the gate line of the liquid crystal display panel at an appropriate time.

In general, a liquid crystal display includes a data side tape carrier package (TCP) in which a data driving chip is formed in a chip on film (COF) method and a gate side TCP in which a gate driving chip is formed in a COF method. It is provided. The data side TCP is connected to a data printed circuit board and the gate side TCP is connected to a gate printed circuit board.

In recent years, the technique of the integrated printed circuit board which mounts a gate power supply part to the said data printed circuit board is employ | adopted. However, even if an integrated printed circuit board is employed, the gate side TCP on which the gate driving chip is mounted is still used.

Therefore, in recent years, a chip on glass (COG) mounting method for directly mounting the data driving chip and the gate driving chip on the liquid crystal display panel has been adopted. The data driving chip connected to the data line is mounted on the data side of the liquid crystal display panel by the COG mounting method, and the gate driving chip connected to the gate line is mounted on the gate side. In addition, the data driving chip is electrically connected to the integrated printed circuit board by a flexible cable film.

The input terminals of the data driving chip are electrically connected to each other via a conductive line of the flexible cable and an anisotropic conductive film (ACF).

The data driving chip includes an output terminal connected to the data line and an input terminal connected to the conductive lines of the flexible cable. In this case, the input terminal is coupled by being crimped at a high temperature after interposing the ACF between the conductive lines of the flexible cable film. As such, when the input terminal of the data driving chip and the conductive lines of the flexible cable film are coupled, the input terminal and the conductive lines correspond to each other. Thus, the data driving chip is electrically connected to the printed circuit board.

However, this bonding method is excellent for electrically connecting the finely formed terminals, but there arises a problem that the flexible cable film is thermally expanded because the bonding process is performed at a high temperature. This expansion of the flexible cable film increases the separation distance between the conductive lines formed in the flexible cable film.

Therefore, the separation distance between the conductive lines arranged to correspond to the input terminals is initially increased, so that the input terminals and the conductive lines do not correspond to each other, thereby causing a poor connection between the liquid crystal display panel and the flexible cable film.

Accordingly, an object of the present invention is to provide a display panel which can prevent a poor connection with a flexible cable film.

Another object of the present invention is to provide a flexible cable film which can prevent a poor connection with the display panel.

1 is a plan view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

2 and 3 are diagrams illustrating in detail a coupling structure of the liquid crystal display panel and the flexible cable film shown in FIG. 1.

4 to 6 are diagrams illustrating types of input terminals of the liquid crystal display panel illustrated in FIG. 1.

7 is a view showing in detail a flexible cable film according to another embodiment of the present invention.

8 and 9 illustrate other types of conductive lines illustrated in FIG. 7.

10 is a view specifically showing a flexible cable film according to another embodiment of the present invention.

The display panel according to the present invention for achieving the above object is connected to the first terminals of the flexible cable film electrically coupled with the circuit board to display an image by an image signal from the circuit board.

The display panel is disposed around a display unit for displaying an image, and is driven from the driving chip and the driving chip for driving the display unit according to an image signal from the circuit board, and are separated from each other by a predetermined distance. And second terminals for connecting the driving chip and the first terminals of the flexible cable film. In this case, the second terminals are formed to extend in a direction in which the flexible cable film is expanded by heat from an end connected with the first terminals to prevent a poor connection between the first terminals and the second terminals. It has a projection of.

According to another aspect of the present invention, there is provided a flexible cable film including a first region connected to a display unit for displaying an image, a second region connected to a circuit unit for providing an image signal to the display unit, and the first region. An insulating film having a central region located between the region and the second region, and extending from the first region to the second region through the central region, and spaced apart from each other, wherein the display portion and the circuit portion are electrically It includes a plurality of conductive lines for connecting. In this case, the plurality of conductive lines extend from the end formed in the first region in a direction in which the insulating film is expanded by heat, and includes a plurality of protrusions for preventing a poor connection with the display unit.

According to the present invention, the input terminals formed on the display panel or the conductive lines of the flexible cable film have protrusions formed by extending in the direction in which the flexible cable film is expanded by heat. Therefore, a poor connection between the display panel and the flexible cable film can be prevented.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the present invention.

1 is a plan view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the liquid crystal display device 400 includes a liquid crystal display panel 100 for displaying an image, a printed circuit board 300 for providing image data to the liquid crystal display panel 100, and the liquid crystal display panel. It consists of a flexible cable film 200 for electrically connecting the 100 and the printed circuit board 300.

The liquid crystal display panel 100 includes a TFT substrate 110 having a switching element and a pixel electrode, a color filter substrate 120 having an RGB pixel and a common electrode formed therebetween, and the TFT substrate 110 and the color filter substrate 120. It consists of liquid crystals (not shown) injected in between.

The liquid crystal display panel 100 configured as described above is divided into a display area for displaying an image and peripheral areas A and B formed around the display area. In detail, the display area includes a TFT substrate 110 having a switching element and a pixel electrode, a color filter substrate 120 having an RGB pixel and a common electrode, and between the TFT substrate 110 and the color filter substrate 120. It is made of a liquid crystal injected into. The TFT substrate 110 is a substrate in which a thin film transistor (not shown) used as the switching element is formed in a matrix form. The data line 111 is connected to the source electrode of the thin film transistor, the gate line 112 is connected to the gate electrode, and the pixel electrode is connected to the drain electrode. In this case, the data lines 111 extend in the lateral direction of the TFT substrate 110, and the gate lines 112 extend in the longitudinal direction of the TFT substrate 110.

On the other hand, the peripheral areas A and B are areas of the TFT substrate 110 that extend from the TFT substrate 110 to the outside of the display area without being corresponding to the color filter substrate 120. The peripheral areas A and B may include a first area A from which the first ends of the data lines 111 are drawn, and a second area from which the second ends of the gate lines 112 are drawn. B) consists of.

In this case, the first region A is connected to the first ends of the data lines 111 to supply image data from the printed circuit board 300 to the data lines 111 at an appropriate time. The data driving chips 113 are disposed. The data driving chips 113 include data side input terminals 115 for receiving image data from the printed circuit board 300 to transmit the image data to the data lines 111. The data side input terminals 115 are connected to conductive lines (not shown) of the flexible cable film 200 connected to one end of the printed circuit board 300.

Gate driving chips 114 connected to the second ends of the gate lines 112 in the second region B to drive the thin film transistor by image data from the printed circuit board 300 are provided. Is placed. In this case, output terminals 112 of the gate driving chips 114 are connected to the gate lines 112. In addition, when the gate driving chips 114 are connected to each other independently so that a signal from the flexible cable film 200 is input through the gate side input terminal 116, the gate driving chips 114 are connected to the gate. The lines 112 are driven sequentially.

Meanwhile, the flexible cable film 200 may include a liquid crystal display panel bonding region C to be coupled to the liquid crystal display panel 100, a printed circuit board bonding region D to be coupled to the printed circuit board 300, and The insulating film 210 may include a central region E formed between the liquid crystal display panel bonding region C and the printed circuit board bonding region D. In addition, conductive lines (not shown) extending from the liquid crystal display panel bonding region C to the printed circuit board bonding region D are formed on the insulating film 210.

In this case, the conductive lines formed in the liquid crystal display panel coupling region C are connected to the input terminals 115 of the data driving chip 113, and the conductive lines formed in the printed circuit board coupling region D are printed. The liquid crystal display panel 100 and the printed circuit board 300 are electrically connected to each other by being connected to the circuit board 300.

2 and 3 are perspective views illustrating a coupling structure between the input terminals of the data driving chip illustrated in FIG. 1 and the flexible cable film.

Referring to FIG. 2, input terminals 115 drawn from the data driving chip 113 are arranged at predetermined intervals in the first region A of the peripheral region, and the flexible cable film 200 A plurality of conductive lines 211 are arranged in the liquid crystal display panel bonding region C at a predetermined interval. In this case, first protrusions 115a protruding into spaced spaces formed between adjacent input terminals 115 are formed in predetermined portions of the input terminals 115, respectively.

In detail, the first protrusion 115a extends from any one of the first and second sidewalls 115b and 115c adjacent to each other. As shown in FIG. 2, the first protrusion 115a may extend from the first sidewall 115b of the input terminals 115. In this case, the first protrusion 115a may protrude from the entire first sidewall 115b of the input terminals 115 and may protrude from a predetermined portion of the first sidewall 115b. However, when protruding from the entirety of the first sidewall 115b, since the probability that the input terminals 115 are shorted increases, as illustrated in FIG. 3, the conductive lines of the flexible cable film 200 ( It is preferable that only the portion (hereinafter, the connecting portion F) to be overlapped and connected to 211) protrude.

In addition, the width in which the first protrusion 115a extends from the first sidewall 115b is about half of the distance between the input terminals 115. Therefore, the connection terminal is prevented from being displaced from the conductive lines 211 due to the expansion of the flexible cable film 200, while still maintaining a space between the input terminals 115 to secure the input terminal. The phenomenon in which the fields 115 are shorted with each other can be prevented. The width of the first protrusion 115a will be described later in the drawings.

The input terminals 115 of the data driving chip 113 having the above structure are electrically connected to the conductive lines 211 of the flexible cable film 200 through the anisotropic conductive film 250. The anisotropic conductive film 250 is composed of an adhesive material and conductive particles formed inside the adhesive material. Therefore, the anisotropic conductive film 250 not only serves to bond the liquid crystal display panel 100 and the flexible cable film 200, but also the input terminals 115 and the conductive lines by the conductive particles. It may serve to electrically connect the 211.

First, when the anisotropic conductive film 250 is disposed on the liquid crystal display panel 100 on which the input terminals 115 are formed, the flexible cable film 200 is disposed on the anisotropic conductive film 250. In this case, when the flexible cable film 200 and the liquid crystal display panel 100 are thermally compressed at a high temperature, the flexible cable film 200 and the liquid crystal display panel 100 are bonded to each other and are connected to the conductive lines 211. Terminals 115 correspond. In this case, the conductive lines 211 and the input terminals 115 are electrically connected by the conductive particles.

As described above, since the process is performed at a high temperature, the flexible cable film 200 is expanded by heat, so that the conductive lines 211 formed in the flexible cable film 200 are wider than the distance that is initially separated. Spaced apart. Thus, as shown in FIG. 3, the conductive lines 211 correspond to the first protrusions 115a extending from the input terminals 115, respectively.

4 to 6 are diagrams illustrating in detail the types of input terminals of the data driving chip illustrated in FIG. 1.

Referring to FIG. 4, input terminals 115 drawn from the data driving chip 113 are formed in the first region A of the liquid crystal display panel 100. The input terminals 115 have a connection part F1 partially overlapping the conductive lines 211 of the flexible cable film 200. A first protrusion 115a protruding from the connection portion F1 toward the adjacent input terminals 115 is formed at the side of the first sidewall 115b of the input terminals 115.

In this case, the directions in which the first protrusions 115a extend are the same. That is, when the first protrusion 115a extends from the first sidewall 115b of the input terminals 115, one of the first protrusion 115a extends from the second sidewall 115c of the input terminal 115. When formed, a short occurs between the input terminals 115. Therefore, it is preferable that all of the first protrusions 115a extend in the same direction.

As shown in FIG. 4, it is assumed that the width w1 of the input terminals 115 is 100 μm, and the separation distance d1 between the input terminals 115 is 100 μm. In this case, the width w2 of the first protrusion 115a has half of the separation distance d1, that is, 50 μm. Therefore, the width w3 of the connection portion F1 is 150 μm, which is increased by 50 μm. At this time, although the width W3 of the connecting portion F1 is increased, the separation distance d1 is secured to '50 μm 'to prevent the input terminals 115 from being shorted to each other.

Referring to FIG. 5, input terminals 115 drawn from the data driving chip 113 are formed in the first region A of the liquid crystal display panel 100. The input terminals 115 have a connection part F2 partially overlapping the conductive lines 211 of the flexible cable film 200. In this case, a second protrusion 115d protruding from the connection portion F2 toward the adjacent input terminals 115 is formed at the side of the second sidewall 115b of the input terminals 115.

In this case, the directions in which the second protrusion 115d extends are the same. That is, when the second protrusion 115d extends from the second sidewall 115c of the input terminals 155, one of the second protrusion 115d extends from the first sidewall 115b of the input terminal 115. When formed, a short occurs between the input terminals 115. Therefore, it is preferable that all of the second protrusions 115d extend in the same direction.

As shown in FIG. 5, it is assumed that the width w1 of the input terminals 115 is 100 μm, and the separation distance d1 between the input terminals 115 is 100 μm. In this case, the width w4 of the second protrusion 115d has half of the separation distance d1, that is, 50 μm. Therefore, the width w5 at the connection part F2 becomes' 150 μm 'which is increased by '50 μm'. In this case, although the width W5 of the connection part F2 is increased, the separation distance d1 is secured to '50 μm 'to prevent the input terminals 115 from being shorted.

Referring to FIG. 6, input terminals 115 drawn from the data driving chip 113 are formed in the first region A of the liquid crystal display panel 100. The input terminals 115 have a connection part F3 partially overlapping the conductive lines 211 of the flexible cable film 200. In this case, the third and fourth protrusions 115e and 115f protruding toward the adjacent input terminals 115 from the connection part F3 on the first and second sidewalls 115b and 115c of the input terminals 115. Are each formed.

Assuming that the width w1 of the input terminals 115 is '100 μm' and the separation distance d1 between the input terminals 115 is '100 μm', the third and fourth The widths w6 and w7 of the protrusions 115e and 115f have '25 mu m ', respectively. Therefore, the width w8 of the connection part F3 of the input terminals 115 has a '150 μm' increased by '50 μm 'by the third and fourth protrusions 115e and 115f. In this case, although the width W8 of the connection part F1 is increased, the separation distance d1 is secured to '50 μm 'to prevent the input terminals 115 from being shorted.

7 is a view showing a flexible cable film according to another preferred embodiment of the present invention.

Referring to FIG. 7, the flexible cable film 200 includes a liquid crystal display panel bonding region C coupled to the liquid crystal display panel 100, a printed circuit board bonding region D coupled to the printed circuit board 300, and The insulating film 210 may include a central region E disposed between the liquid crystal display panel bonding region C and the printed circuit board bonding region D. In addition, conductive lines are formed on the insulating film 210 by extending from the liquid crystal display panel bonding region C to the printed circuit board bonding region D through the central region E. FIG. The conductive lines are arranged at a predetermined distance apart.

The conductive lines are formed in the central area E and covered by the insulating film 210, and are formed in the central portion 213 and the liquid crystal display panel bonding area C, and are not covered by the insulating film 210. The input unit 214 is formed in the exposed output unit 212 and the printed circuit board bonding region D and is not covered by the insulating film 210. In this case, the output unit 212 has a fifth protrusion 212a protruding from one of the first and second sidewalls 212b and 212c of the output unit 212 toward the adjacent output unit 212.

As shown in FIG. 7, the fifth protrusion 212a protrudes from the first sidewall 212b of the output unit 212. In this case, the fifth protrusion 212a may protrude to the same length as the output unit 212, but the liquid crystal display panel 100 may be reduced in order to reduce the probability that a short phenomenon occurs between the output units 212. It protrudes from the connection part G1 overlapping with the input terminal 115 of.

8 to 9 are diagrams illustrating other shapes of conductive lines of the flexible cable film illustrated in FIG. 7.

Referring to FIG. 8, output portions 212 of the conductive lines are formed in the liquid crystal display panel bonding region C of the flexible cable film 200. The output parts 212 are formed to be spaced apart from each other at predetermined intervals, and the sixth protrusion part 212d is formed in the connection part G2. In this case, the sixth protrusion 212d extends from the second sidewall 212c of the output unit 212 toward the adjacent output unit 212. Preferably, the sixth protrusions 212d extend in the same direction. That is, when the sixth protrusion 212d protrudes from the second sidewall 212c, if any one protrudes from the first sidewall 212b, the output parts 212 are shortened to each other.

Referring to FIG. 9, output portions 212 of the conductive lines are formed in the liquid crystal display panel bonding region C of the flexible cable film 200. The output parts 212 are formed to be spaced apart from each other at predetermined intervals, and the seventh protrusion part 212e and the eighth protrusion part 212f are formed in the connection part G3. In this case, the seventh and eighth protrusions 212e and 212f extend from the first and second sidewalls 212b and 212c of the output unit 212 toward the adjacent output unit 212.

10 is a view specifically showing a flexible cable film according to another embodiment of the present invention.

Referring to FIG. 10, the output parts 215 are formed in the liquid crystal display panel bonding region C of the flexible cable film 200. In this case, the output units 215 are formed spaced apart from each other at a predetermined interval. The output units 215 have a uniform width from a portion where the bonding region C of the liquid crystal display panel starts to a portion where the bonding region C of the liquid crystal display panel ends. In this case, a plurality of through holes 216 formed through the insulating film 210 are formed in the insulating film 210 positioned in the spaced spaces of the output parts 215.

The diameter of the plurality of through holes 216 may be smaller than the separation distance of the output parts 212. That is, the diameter of the through hole 216 is formed larger than the separation distance d1.

The plurality of through holes 216 lowers the temperature applied to the flexible cable film 200 in a process in which the liquid crystal display panel 100 and the flexible cable film 200 are thermocompressed at a high temperature. Therefore, the rate at which the flexible cable film 200 is expanded by heat can be reduced, thereby increasing the separation distance d1 of the output parts 212, so that the output parts 212 and the liquid crystal display panel ( It is possible to prevent a connection failure caused by the input terminals 115 of the 100 not corresponding to each other.

Although not shown in the drawings, the connection portion of the conductive lines formed in the liquid crystal display panel coupling region may have a protrusion formed at the connection portion connected to the input terminals of the liquid crystal display panel. In this case, the protrusion extends from the second sidewall of the conductive lines toward the adjacent conductive lines.

According to the present invention, the liquid crystal display panel is connected with a flexible cable film combined with the printed circuit board to receive an image signal from the printed circuit board. The liquid crystal display panel is electrically connected to conductive lines of the flexible cable film through input terminals drawn from a data driving chip provided at one side. In this case, the input terminals or the conductive lines may include protrusions extending in a direction in which the flexible cable film is expanded by heat.

Therefore, in the process of bonding the liquid crystal display panel and the flexible cable film, the input terminal and the conductive lines do not correspond to each other even though the flexible cable film is expanded by heat and the separation distance of the conductive lines is wider than the initial stage. A bad connection can be prevented.

Although described with reference to the examples, those skilled in the art can understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention described in the claims below. There will be.

Claims (8)

A display panel connected to first terminals of a flexible cable film electrically coupled to a circuit board to display an image by an image signal from the circuit board. A display unit for displaying an image; Is formed extending from the display portion to the periphery of the display portion, each is disposed spaced apart by a predetermined distance, including a second terminal for connecting the first terminal of the display portion and the flexible cable film, The second terminals are formed to extend in a direction in which the flexible cable film is thermally expanded from an end connected with the first terminals, and a plurality of protrusions for preventing a poor connection between the first terminals and the second terminals. Display panel comprising a. The display panel of claim 1, wherein a driving chip connected to the second terminals is mounted around the display unit to drive the display unit according to an image signal from the circuit board. The display panel of claim 2, wherein the plurality of protrusions extend to a spaced space formed between the second terminals. The display panel of claim 3, wherein each of the plurality of protrusions extends in the same direction. An insulating film having a first region connected with a display portion for displaying an image, a second region connected with a circuit portion for providing an image signal to the display portion, and a central region located between the first region and the second region ; And A plurality of conductive lines formed extending from the first region to the second region through the central region and arranged to be spaced apart from each other, for electrically connecting the display unit and the circuit unit; The plurality of conductive lines are formed extending from the end formed in the first region in the direction in which the insulating film is expanded by heat, and has a plurality of protrusions for preventing a poor connection with the display portion Cable film. The flexible cable film of claim 5, wherein the plurality of protrusions extend to a spaced space formed between the conductive lines. The flexible cable film of claim 6, wherein each of the plurality of protrusions extends in the same direction. 6. The ductility of claim 5, wherein a plurality of through holes are formed between the conductive lines disposed in the first region to penetrate the insulating film to prevent the insulating film from expanding by heat. Cable film.