KR20060072767A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a display device capable of preventing a short circuit between pads due to a misalignment between a display panel, a drive circuit, and a TCP in which the drive circuit is mounted. A plurality of signal lines for applying a driving signal and an image signal to the display panel; A first pad formed at one end of the signal line; A second pad having a pattern shape on the first pad, the second pad being disposed to be offset from each other on a neighboring first pad; A driving circuit for applying a signal from the outside to the signal line; And a connection terminal drawn out from the driving circuit and connected to the second pad in a one-to-one correspondence.

Description

Liquid crystal display device {LIQUID CRYSTAL DISPLAY DEVICE}

1A and 1B illustrate a failure in inter-pad short circuit due to a misalignment between a conventional liquid crystal panel and TCP. FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view taken along line II ′ of FIG. 1A.

2 is a view schematically showing a liquid crystal display device according to the present invention.

3 is a view showing an anisotropic conductive film.

4 is a view showing a part of a data pad part and a data driving circuit part;

5 is a cross-sectional view taken along the line II-II 'of FIG. 4;

6A and 6B illustrate a state in which the data connection pad and the connection pad of the driving circuit of the liquid crystal panel according to the present invention are normally in contact. FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along line III-III ′ of FIG. 6A.

7A and 7B illustrate a misalignment between the data connection pad of the liquid crystal panel and the connection pad of the driving circuit according to the present invention. FIG. 7A is a plan view, and FIG. 7B is a IV-IV ′ of FIG. 7A. Section.

*** Explanation of symbols for main parts of drawing ***

100a: color filter substrate 100b: thin film transistor substrate

103a to 103c and 203a to 203c: first to third data pads

104a to 104c, 204a to 204c: first to third data connection pads                 

106a to 106c, 206a to 206c: first to third link lines

109a-109c, 209a-209c: 1st to 3rd contact holes

110: tape carrier pakage (TCP)

115a to 115c, 215a to 215c: first to third connection pads

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of preventing a short between pads due to misalignment between a liquid crystal panel and a TCP in which a driving device is mounted.

In recent years, liquid crystal display panels (hereinafter referred to as "LCDs") have been improved in quality due to improvements in liquid crystal materials and development of fine pixel processing technology, along with features such as light weight, thinness, and low power consumption. In addition, the application range is gradually increasing. On the other hand, the LCD is composed of a liquid crystal panel and a driving circuit portion for driving the liquid crystal panel. The liquid crystal panel is arranged in a matrix form between two glass substrates (ie, upper glass and lower glass), but switch elements (ie TFT arrays) for switching between the liquid crystal cells and the signals supplied to these liquid crystal cells, respectively. It consists of. The driving circuit unit is mounted on a printed circuit board to drive the liquid crystal panel. In this case, TCP (Tape Carrier Package) is used for signal transmission between the liquid crystal panel and the PCB, and conductive resin such as anisotropic conductive film (ACF) is used for the lower glass and the printed circuit board. Attach directly. In this case, a conductive ball having conductivity is incorporated in the ACF. When the TCP is pressed at a predetermined pressure so as to be attached to the attachment site (ie, the contact area between the TCP and the bottom glass or the TCP and the PCB), the conductive ball embedded in the ACF is pressed to maintain the conductivity at the attachment site.

A drive IC is mounted on the TCP, and a pad drawn out from the drive circuit is electrically connected to the liquid crystal panel to apply a signal received from the printed circuit board to the liquid crystal panel.

A plurality of gate lines and data lines are vertically and horizontally arranged on the liquid crystal panel to define a plurality of pixels, and at each end of the lines, gate pads and data pads for electrically connecting with the pads drawn from the driving circuit are formed, respectively. It is.

Therefore, in order to normally connect the TCP and the liquid crystal panel through the ACF, accurate alignment of the pad of the driving circuit (gate driving circuit and data driving circuit) and the gate / data pad of the liquid crystal panel should be made.

However, since the gap between the pads of the liquid crystal panel is very narrow, it is difficult to accurately align between the driving circuit and the liquid crystal panel, and if the alignment between the pads is not accurate, the pads of the driving circuit and the panel of the liquid crystal panel do not have a one-to-one correspondence. As a result, there is a problem of shorting with neighboring pads.

1A and 1B illustrate short-circuit defects due to misalignment between a pad of a conventional driving circuit and a pad of a liquid crystal panel. FIG. 1A is a plan view briefly illustrating a part of a pad part. It is sectional drawing of II 'of 1a.

As shown in the figure, a plurality of pads 3a are disposed on the transparent substrate 1 at regular intervals, and a connection pad 3b for connecting the plurality of pads 3a to a driving circuit thereon. ) Is formed. In this case, when the pad is a data pad, the data pad 3a is formed on the gate insulating film 8, and a protective film 11 is interposed between the data pad 3a and the connection pad 3b. The data pad 3a and the connection pad 3b are electrically connected to each other through the contact hole 4 formed in the passivation layer 11.

On the connection pad 3b, the pad 5 drawn out from the driving circuit is electrically connected through the ACF. Although not shown in the drawing, the driving circuit is mounted on the TCP, and the pad is formed on the TCP.

However, as described above, in the case where the alignment between the driving circuit and the liquid crystal panel is not correct, the pad 5 of the driving circuit does not have a one-to-one correspondence with the pad 3b of the liquid crystal panel. 5) Two data connection pads 3b are connected to each other, resulting in a short circuit failure between the data pads 3a.

As described above, when a short circuit occurs between the data pads, signal transmission to the liquid crystal panel is not normally performed, resulting in a defective screen.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a display device capable of preventing the occurrence of a short circuit between the pad due to misalignment between the display panel and the TPC.                         

Another object of the present invention is to provide a liquid crystal display device capable of preventing a short circuit between pads due to misalignment between the liquid crystal panel and the TPC.

The present invention for achieving the above object and the display panel. A plurality of signal lines for applying a driving signal and an image signal to the display panel, a first pad formed at one end of the signal line, and a pattern on the first pad, the first pad being adjacent to the first pad A display device including a second pad disposed to be offset from each other, a driving circuit for applying a signal from the outside to the signal line, and a connection terminal drawn out from the driving circuit and connected to the second pad in a one-to-one correspondence; to provide.

The signal line may be a data line, wherein the first pad is a data pad and the second pad is a data connection pad. A protective film is interposed between the first pad and the second pad, and electrically connects the first pad and the second pad through a contact hole formed in the protective film.

In addition, the signal line may be a gate line, wherein the first pad is a gate pad and the second pad is a gate connection pad. A gate insulating film and a protective film are interposed between the first pad and the second pad, and the first pad and the second pad are electrically connected to each other through contact holes formed in the gate insulating film and the protective film.

In addition, the data connection pad and the gate connection pad are formed of indium ton oxide (ITO).                     

The connection terminal may have a same pattern shape as that of the second pad, a connection pad directly contacting the second pad, a link line having a narrower width than the connection pad, and connecting the driving circuit and the connection pad. Is done. At this time, the width of the link line is formed to be narrower than the width of the first pad.

The present invention also provides a liquid crystal panel comprising a first substrate and a second substrate, and a liquid crystal layer formed between the first and second substrates; A plurality of gate lines arranged in a first direction on the first substrate; A data line arranged in a direction perpendicular to the gate line to define a plurality of pixels; A gate driver circuit and a data driver circuit for supplying external signals to the gate line and the data line; A data pad formed at an end of the data line to receive a signal from the data driver circuit; A data connection pad formed in a pattern shape on the data pad and disposed to be offset from each other on a neighboring data pad; A connection pad connected to the data driving circuit and contacting the data connection pad in a one-to-one correspondence to apply a data signal through the data connection pad; And a link line connecting the connection pad and the data driving circuit, wherein the connection pad has an arrangement in which neighboring pads are shifted from each other, and the width of the link line is narrower than the width of the connection pad. Provided is an element. In this case, the width of the link line is smaller than the width of the data pad, and the data connection pad and the connection pad of the data driving circuit have the same pattern shape.

As described above, according to the present invention, the connection pads of the display panel and the driving circuit are disposed to be offset from each other between neighboring pads, thereby preventing a short circuit between the connection pads due to misalignment between the liquid crystal panel and the driving circuit.

Conventionally, the connection pad is formed on the front surface of the signal pad of the liquid crystal panel, and the connection pad of the driving circuit has the same shape as the connection pad of the liquid crystal panel. There is a problem that the pad is shorted with the connection pad of the adjacent liquid crystal panel. Accordingly, the present invention solves this problem by forming adjacent connection pads to be shifted from each other.

In other words, the present invention does not form a connection pad for contacting the driving circuit on the signal pad extending from the signal line of the display panel on the entire surface of the signal pad, but rather in a pattern shape having a predetermined area on the signal pad. . In this case, the connection pads are not disposed on the same line between the pads adjacent to each other, and are formed to be offset from each other. In addition, the connection pad of the driving circuit in contact with the connection pad is formed in the same shape as the connection pad of the liquid crystal panel, and the width of the link line connecting the connection pad and the driving circuit is formed to have a narrower width than the conventional one. That is, the link line of the driving circuit has a narrower width than the signal pad of the liquid crystal panel. In this case, the connection pads of the driving circuit may have the same arrangement as that of the connection pads of the liquid crystal panel, and may have misalignment arrangements between neighboring pads.

Therefore, in the process of electrically connecting the driving circuit and the connection pads of the liquid crystal panel, a misalignment occurs, even if the connection pads of the driving circuits are overlapped with neighboring signal pads, the connection formed on the overlapped signal pads. Since the pads are arranged so as to deviate from the connection pads of the overlapping driving circuits, short-circuit defects do not occur between them.

Hereinafter, the printed circuit board according to the present invention will be described in more detail with reference to the accompanying drawings.

2 is a plan view schematically showing a liquid crystal display device according to the present invention.

As shown in the figure, the liquid crystal display device includes a liquid crystal panel 100 composed of a color filter substrate 100a and a thin film transistor substrate 100b and a driving circuit unit 105 for driving the liquid crystal panel 100. . A liquid crystal layer is formed between the two substrates 100a and 100b, and a color filter and a black matrix (not shown) are formed on the color filter substrate 100a.

A plurality of gate lines 107 and data lines 109 are vertically and horizontally disposed on the thin film transistor substrate 100b to form a pixel portion P defining a plurality of pixels, and a thin film transistor is formed on each pixel. It is. In addition, a pad portion 140 having a plurality of pads connected to one side of the gate / data lines 107 and 109 is formed at an edge of the thin film transistor substrate 100b not covered by the color filter substrate 100a. The pads are connected to TCP 110.

The TCP 110 has a driving circuit unit 105 for driving the liquid crystal panel 100. In addition, the TCP 110 is also connected to a printed circuit board (PCB) (120), the PCB 120 is a plurality of elements such as an integrated circuit is formed on the substrate, the liquid crystal panel ( Various control signals and data signals for driving 100 are generated.                     

The TCP 110 configured as described above is connected to the pad portion 140 of the thin film transistor substrate 100b by an anisotropic conductive film, and then adheres the anisotropic conductive film containing the conductive particles on the pad portion 140. In addition, the terminals 110 formed on the TCP 110 may be connected to the pad unit 140 to connect the TCP 110 to the pad unit 140 of the substrate through proper heat and pressure.

As shown in FIG. 3, since the anisotropic conductive film 130 has a structure including a plurality of conductive balls 135 surrounded by a thin insulating film 133 inside the anisotropic film 131, the anisotropic conductive film 130 is formed. After attaching to the pad unit 140, the pad of the TCP (110) is arranged to match the pad 140 of the substrate, and then pressed while applying heat to the attachment portion, the conductive ball 135 ) And the insulating film 133 surrounding the conductive ball 135 is destroyed by the compression of the (), the conductive is formed to electrically connect the pad terminals.

2, the pad part 140 includes a gate pad part provided at one side of the gate line 107 and a data pad part provided at one side of the data line 109. In general, in the liquid crystal panel, since the number of data lines is larger than the number of gate lines, the spacing between pads of the data pad portion is narrower than that of the pads of the gate pad portion.

In addition, although not shown in detail in the drawing, the data pad part includes a data pad extending from a data line and a data connection pad formed on the data pad, and a protective film is interposed between the data pad and the data connection pad. have. The data pad and the data connection pad are electrically connected to each other through a contact hole formed in the passivation layer, and the data connection pad is substantially connected to the connection terminals of the driving circuit 105 mounted on the TCP 110. It is an area.

In this case, the data connection pads are formed in a pattern shape on the data pads, and are disposed to be offset from each other between neighboring pads. In other words, the adjacent pads are not formed on the same line with each other, but are arranged so as to be zigzag-shifted.

In addition, the pad of the driving circuit electrically connected to the data connection pad through the anisotropic conductive film also has a one-to-one correspondence with the data connection pad, and has a pad having the same shape as the data connection pad.

That is, the pads of the driving circuit which are in electrical contact with the data connection pads are also separately provided with connection pads having the same arrangement as the data connection pads.

FIG. 4 is a cross-sectional view of a data pad formed on a thin film transistor substrate of a liquid crystal panel and a connection terminal of a data driving circuit electrically connected to the data pad, and FIG. 5 is a cross-sectional view taken along the line II-II 'of FIG. 4. It is shown.

The configuration of the connection terminal of the data pad unit and the driving circuit according to the present invention will be described in more detail. As shown in the drawing, the TCP 110 in which the data driving circuit 105 'is mounted on the thin film transistor substrate 100b. ) And a data pad part 103 is formed to be electrically connected to each other, and one side of the TCP 110 is withdrawn from the data driving circuit 105 ′ through the data pad part 103 and the anisotropic conductive film. A plurality of connection terminals 115 for electrically connecting are formed.

For convenience of explanation, in an enlarged view, in which three pads are bundled and enlarged, first to third data pads 103a to 103c extending from data lines formed on the screen display unit of the liquid crystal panel are formed on the thin film transistor substrate 100b. Formed. In addition, first to third data connection pads 104a to 104c having a predetermined area are formed on the first to third data pads 103a to 103c, and the first to third contact holes 109a. Each of the first to third data pads 103a to 103c is electrically connected to each other through ˜109c). In this case, the first to third data connection pads 104a to 104c have a staggered arrangement of zigzag shapes. That is, the second data connection pad 104b is formed on the outer side than the neighboring first data connection pad 104a, and the third data connection pad 104c is on the outer side than the second data connection pad 104b. Formed. In this case, the first and third data connection pads 104a and 104c may be formed at the same position. That is, the third data connection pad 104c is formed on the same line as the first data connection pad 104a, or the first data connection pad 104a is on the same line as the third data connection pad 104c. Can be formed.

As such, in the present invention, as long as there is only a staggered arrangement between neighboring data connection pads, any arrangement may be used.

In addition, a connection terminal is formed on the TPC 110 to be connected to the first to third data connection pads 104a to 104c by being drawn from the data driver circuit 105 ', and the connection terminal is formed on the first terminal. A first connecting third to third connecting pads 115a to 115c in contact with the third data connecting pads 104a to 104c and the driving circuit 105 'and the first to third connecting pads 115a to 115c. It consists of the 1st-3rd link lines 106a-106c.

In this case, the first to third connection pads 115a to 115c have the same pattern shape as the first to third data connection pads 104a to 104c, and the first to third data connection pads ( Like 104a-104c, they have staggered arrangements between neighboring pads. In this case, the first to third connection pads 115a to 115c may have any arrangement as long as they have a staggered arrangement between neighboring pads. However, the first to third data connection pads 104a to 104c and the first to third connection pads 115a to 115c should have the same arrangement.

In addition, the first to third link lines 106a to 106c have a width smaller than the width of the first to third connection pads 115a to 115c, and in particular, the first to third data pads 103a. It should be narrower than the width of ˜103c). This is to prevent a short circuit failure between the data pads by the first to third link lines 106a to 106c.

The first to third data pads 103a to 103c are formed on the gate insulating layer 108, and a passivation layer 111 is formed on an entire surface of the first to third data pads 103a to 103c. First to third data connection pads 104a to 104c are formed on the first to third data pads 103a to 103c and are electrically connected to each other through the first to third contact holes 109a to 109c. In this case, each contact hole may be formed in at least one contact pad.

In addition, the first connection pad 115a contacts the first data connection pad 104a, the second connection pad 115b contacts the second data connection pad 104b, and the third connection pad ( 115c is in contact with the third data connection pad 104c.

6A and 7A are plan views showing the first to third data connection pads of the liquid crystal panel and the first to third connection pads of the TCP connected. FIG. 6A is a diagram in which the liquid crystal panel and TCP are normally aligned. 7A illustrates a state in which misalignment is generated between the liquid crystal panel and the TCP. 6B and 7B illustrate cross-sectional views of III-III ′ of FIG. 6A and IV-IV ′ of FIG. 7A. In particular, the first data connection pad and the third data connection pad are disposed on the same phase. An example is shown.

All configurations are the same as those described in the previous drawings (an enlarged view of FIG. 4 and FIG. 5), and as shown in FIGS. 6A and 6B, when the liquid crystal panel and the TCP are correctly aligned, the thin film transistor substrate ( The first to third data connection pads 204a to 204c formed at 200b and the first to third connection pads 215a to 215c formed on the TCP are correctly contacted in a one-to-one correspondence. In this case, although the first to third data connection pads 204a to 204c and the first to third connection pads 215a to 215c are in contact with each other with an anisotropic conductive film interposed therebetween, the anisotropic conductive film and TCP are omitted in the drawing. .

7A and 7B, when a misalignment occurs between the liquid crystal panel and the TCP, the first to third connection pads 215a to 215c formed on the TCP are connected to the first to third data. It is biased to one side than the pads 204a to 204c. Accordingly, the first connection pad 215a contacts the first data connection pad 204a and overlaps with the neighboring second data pad 203b, and the second connection pad 215b is the second data. In contact with the connection pad 204b and overlap with the neighboring third data pad 203c.

In this case, a passivation layer 211 is formed on the second data pad 203b, and the second data connection pad 204b formed on the second data pad 203b is connected to the first connection pad 215a. Because of the staggered arrangement, even if the first connection pad 215a and the second data pad 203b overlap, short-circuit defects do not occur between them. Similarly, since the third data connection pad 204c formed on the third data pad 203c is also in a staggered arrangement with the second data connection pad 204b, the second connection pad 215b is connected to the third data pad. Even if it overlaps with the data pad 203c, a short circuit defect between them does not occur.

As described above, the present invention is formed so that the pads connected to the driving circuits have a mutually staggered arrangement, thereby preventing short circuit between the pads due to misalignment between the driving circuit and the panel.

Meanwhile, although the data pad is described as an example in the embodiment of the present invention, the basic concept of the present invention may be applied to the gate pad in such a way that the arrangement between the pads is staggered. However, in general, since more data lines are formed than gate lines, the distance between pads is formed closer than that of the gate pads, and thus, a short occurrence rate between pads is caused by misalignment with TCP. Therefore, when the present invention is applied to the data pad and the connection pad of the data driving circuit, it is possible to effectively prevent the short circuit.

Meanwhile, when the present invention is applied to the gate pad part, a gate insulating film and a protective film are formed on the gate pad, and the gate connection pad and the gate pad are electrically connected through the contact holes formed in the gate insulating film and the protective film.

In addition, the present invention is not limited to the liquid crystal panel, but may be applied to not only display panels such as PDPs and ELs, but also to all devices that externally connect the connection pads of the driving circuits and the signal pads of the signal lines.

As described above, according to the present invention, the connection pads of the liquid crystal panel and the connection pads of the driving circuit part have a one-to-one correspondence. It is possible to prevent a short circuit between the pads, which can be caused by, thereby further increasing the production efficiency.

Claims (15)

Display panel; A plurality of signal lines for applying a driving signal and an image signal to the display panel; A first pad formed at one end of the signal line; A second pad having a pattern shape on the first pad, the second pad being disposed to be offset from each other on a neighboring first pad; A driving circuit for applying a signal from the outside to the signal line; And And a connection terminal drawn out from the driving circuit and connected to the second pad in a one-to-one correspondence. The display device of claim 1, wherein the signal line is a data line. The display device of claim 2, wherein the first pad is a data pad and the second pad is a data connection pad. The display device of claim 2, wherein a protective film is interposed between the first pad and the second pad. The display device of claim 4, wherein a contact hole is formed in the passivation layer to electrically connect the first pad and the second pad. The display device of claim 1, wherein the signal line is a gate line. The display device of claim 6, wherein the first pad is a gate pad, and the second pad is a gate connection pad. The display device of claim 6, wherein a gate insulating film and a protective film are interposed between the first pad and the second pad. The display device of claim 8, wherein a contact hole is formed in the gate insulating layer and the protective layer to electrically connect the first pad and the second pad. The display device of claim 3, wherein the data connection pad and the gate connection pad are formed of indium ton oxide (ITO). The method of claim 1, wherein the connection terminal, A connection pad having the same pattern shape as the second pad and in direct contact with the second pad; And A display device having a narrower width than the connection pad and comprising a link line connecting the driving circuit and the connection pad. The display device of claim 11, wherein a width of the link line is narrower than a width of the first pad. A liquid crystal panel comprising a first substrate and a second substrate and a liquid crystal layer formed between the first and second substrates; A plurality of gate lines arranged in a first direction on the first substrate; A data line arranged in a direction perpendicular to the gate line to define a plurality of pixels; A gate driver circuit and a data driver circuit for supplying external signals to the gate line and the data line; A data pad formed at an end of the data line to receive a signal from the data driver circuit; A data connection pad formed in a pattern shape on the data pad and disposed to be offset from each other on a neighboring data pad; A connection pad connected to the data driving circuit and contacting the data connection pad in a one-to-one correspondence to apply a data signal through the data connection pad; And And a link line for connecting the connection pad and the data driving circuit, wherein the connection pad has a disposition between neighboring pads, and the width of the link line is narrower than the width of the connection pad. . The liquid crystal display of claim 13, wherein the width of the link line is narrower than the width of the data pad. The liquid crystal display device according to claim 13, wherein the data connection pad and the connection pad of the data driver circuit have the same pattern shape.

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