KR20060001018A - Liquid crystal display panel assembly and tape carrier package therein - Google Patents

Abstract

The present invention relates to a liquid crystal panel assembly comprising a liquid crystal panel, a printed circuit board on which a driving circuit thereof is mounted, and a TCP for electrically connecting them, and a liquid crystal panel TCP provided thereto. Specifically, the present invention provides a liquid crystal panel comprising a plurality of first exposed pitch electrodes arranged along at least one edge to maintain a predetermined interval; A printed circuit board having the liquid crystal panel driving circuit mounted thereon and having a plurality of second exposed pitch electrodes arranged along at least one edge; A plurality of first and second contact pitch electrodes corresponding to each of the first and second exposed pitch electrodes are provided along the ends overlapping the edges of the liquid crystal panel and the printed circuit board, respectively. And a TCP in which an array interval gradually decreases at a predetermined rate as the distance from the first exposure pitch electrode is equal to a distance from the second exposure pitch electrode, and the liquid crystal panel provided therewith. Provide TCP.

Liquid crystal panel, exposed pitch electrode, TCP, contact pitch electrode, differential array

Description

Liquid crystal panel assembly and tape carrier package therein             

1 is a perspective view of a general liquid crystal panel assembly.

2 is an exploded perspective view of a portion of the circle A of FIG. 1;

3 is a cross-sectional view taken along the line III-III of FIG.

4 is a perspective view of a liquid crystal panel assembly according to the present invention;

FIG. 5 is an exploded perspective view of a portion of the circle B in FIG. 4; FIG.

6 is a cross-sectional view taken along the line V-V of FIG.

7 is a plan view showing a comparison between the exposed pitch electrode of the liquid crystal panel and the contact pitch electrode of the TCP according to the present invention.

<Description of the symbols for the main parts of the drawings>

50: liquid crystal panel 52: array substrate

56: first exposed pitch electrode 58: color filter substrate

90: printed circuit board 92: second exposed pitch electrode

100: TCP 102, 104: first and second contact pitch electrode                 

112: ACF 114: heating tool

The present invention relates to a liquid crystal panel assembly and a liquid crystal panel TCP included in the liquid crystal panel assembly, and more particularly, a liquid crystal panel assembly comprising a liquid crystal panel and a printed circuit board on which a driving circuit thereof is mounted, and a TCP for electrically connecting them. It relates to TCP for liquid crystal panels.

In general, a liquid crystal display (LCD) is essentially provided with a liquid crystal panel including a pair of substrates bonded to each other with a liquid crystal layer having optical anisotropy and polarization therebetween. A pair of substrates face each other, and field generating electrodes are formed on each of them, causing electric field changes therebetween to artificially adjust the alignment direction of the liquid crystal molecules, and to change various transmittances of light at this time. Mark as external.

Recently, an active matrix type in which pixels, which are basic units of image expression, are arranged in a matrix manner and each pixel is independently controlled by one-to-one correspondence of thin-film transistors (TFTs). It is outstanding in its resolution and video ability.

In this case, one of the two substrates constituting the liquid crystal panel has a plurality of gate lines and data lines vertically and horizontally defined to define a plurality of pixels, and a thin film transistor is provided at the intersection of each pixel, and one-to-one corresponding pixel electrodes are provided. An array substrate mounted with pixels is formed.

The other substrate includes a black matrix that borders each pixel to have a non-display area, and a red, green, blue color filter, and a common electrode corresponding to each lattice thereof to form a color filter substrate. When a thin film transistor selected for each gate line is turned on by an on / off scan signal of a thin film transistor that is scanned and applied to a line, an image signal transmitted through a plurality of data lines is applied to its pixel electrode, and as a result, it is common to the pixel electrode. Due to the potential difference between the electrodes, the alignment direction of the liquid crystal molecules is changed, and the transmittance of each pixel is changed.

Thus, a target image is displayed by combining the color and transmittance change of each pixel.

In the liquid crystal panel, at least one printed circuit board on which a gate driver circuit for outputting a scan signal and a data driver circuit for outputting an image signal are mounted is connected to each other by TCP. Hereinafter, all of these liquid crystal panels are collectively referred to as liquid crystals. It is called a panel assembly.

1 is a perspective view illustrating a general liquid crystal panel assembly, and as shown, the liquid crystal panel 10 is bonded to each other with the lower array substrate 12 and the upper color filter substrate 18 facing each other with the liquid crystal layer interposed therebetween. Along the edge thereof, one or more printed circuit boards 20 on which the gate driver circuit and the data driver circuit are mounted are connected to the plurality of TCPs 30.

In more detail, referring to FIG. 2, which is a partially disassembled perspective view of part A of the circle of FIG. 1, that is, a TCP 30 connecting the printed circuit board 20 and the liquid crystal panel 10, a typical liquid crystal The panel 10 has a larger area of the array substrate 12 so that two adjacent edges of the array substrate 12 are exposed to the outside of the color filter substrate 18, and each of the plurality of first exposed pitch electrodes drawn from the gate line or the data line is formed. 16) is arranged. In this case, each of the exposed pitch electrodes 16 is divided into several collection groups, and a plurality of exposure pitch electrodes 16 are arranged at minute uniform intervals.

In addition, the plurality of second exposed pitch electrodes 22 for outputting the scan signal or the image signal along at least one edge of the printed circuit board 20 are divided into a plurality of groups as described above, and have a fine uniform interval for each group. It is arranged keeping.

In addition, a plurality of first and second contact pitch electrodes 32 and 34 that correspond one-to-one with first and second exposed pitch electrodes 16 and 22 in each group at both ends of the TCP 30 for connecting them to each other. The first and second contact pitch electrodes 32 and 34 formed at the edges of both ends of the TCP 30 are respectively arranged at the same minute intervals, and the first exposed pitch electrodes 16 of the liquid crystal panel 10 are respectively shown. ) And the second exposed pitch electrode 22 of the printed circuit board 20 are connected one-to-one.

On the other hand, the process of connecting the contact pitch electrodes 32 or 34 of the TCP 30 to the exposed pitch electrodes 16 or 22 of the liquid crystal panel 10 or the printed circuit board 20 in a one-to-one correspondence is generally TAB (Tape). Automated Bonding, which is a cross-sectional view taken along line III-III of FIG. 1, exposes the first contact pitch electrode 32 at one end of the TCP 30 to the first edge of one edge of the array substrate 12. In the state overlapped with the pitch electrode 16 through the ACF (Anisotropic Conductive Film: 42) in between, while applying a heat and pressure while pressing and sliding along the outer surface of the TCP 30 with a predetermined heating tool 44 Connect. Although not shown in the drawings, the same applies to the connection between the second exposed pitch electrode 22 of the printed circuit board 20 and the second contact pitch electrode 34 at the other end of the TCP 30. Unless otherwise stated, the following descriptions correspond to all of them.

At this time, the ACF 42 has a tape shape in which the conductive material particles are dispersed and contained in the thermosetting resin, and the resin part is cured by heat and pressure, and the conductive material particles are pressed up and down to expose the first exposed pitch electrode 16. ) And the first contact pitch electrode 32 are respectively connected one-to-one.

However, the general liquid crystal panel assembly and the TCP connection method have some disadvantages. Among them, the length of the TCP itself is extended by the heat and pressure used in the TAB process, so that the first exposed pitch electrode 16 and the first contact pitch are reduced. This is a phenomenon in which the electrode 32 is misaligned.

That is, the spacing between the first contact pitch electrodes 32 of the general TCP is the same as the spacing between the first exposed pitch electrodes 16 of the array substrate 12 to be connected to each other, as shown in FIG. At one point where the tool 44 is in contact with each other, they are relatively precisely matched with each other, but as they move away from each other, the length of the TCP 30 itself increases due to heat and pressure, and as a result, the spacing between the first contact pitch electrodes 32 increases. Is generated.                         

As the distance between the first exposed pitch electrodes 16 of the array substrate 12 is unchanged, the distance between the first exposed pitch electrodes 16 and the heating tool 44 is eventually displaced from one point where the heating tool 44 first contacts, resulting in a short circuit or an electrical disconnection. .

Such short-circuit or electrical disconnection shows a line-shaped line defect in the image, which acts as a fatal defect that greatly degrades the image quality of the liquid crystal panel.

Accordingly, the present invention has been made to solve the above problems, and despite the TAB process caused by heat and pressure, there is no misalignment phenomenon, and the Pitch electrode of the exposed pitch electrode of the liquid crystal panel or the printed circuit board and the contact pitch electrode of the TCP are reliable. The purpose is to present a concrete way to enable one-to-one correspondence.

Through this, it is intended to provide a liquid crystal panel assembly and TCP included therein, which can prevent image quality degradation such as line defects, and further improve image realization.

A liquid crystal panel having a plurality of first exposed pitch electrodes arranged along at least one edge in order to achieve the above object; A printed circuit board having the liquid crystal panel driving circuit mounted thereon and having a plurality of second exposed pitch electrodes arranged along at least one edge; A plurality of first and second contact pitch electrodes corresponding to each of the first and second exposed pitch electrodes are provided along the ends overlapping the edges of the liquid crystal panel and the printed circuit board, respectively. It provides a liquid crystal panel assembly comprising a TCP in which the interval between the array gradually decreases at a predetermined rate as the distance from the first and second exposed pitch electrodes at the same interval with respect to one point.

In this case, the first and second exposed pitch electrodes and the first and second contact pitch electrodes are each connected by applying heat and pressure in a direction gradually away from the point with the ACF therebetween.

And the interval spacing according to the constant ratio is characterized in that for the compensation for the length of the TCP by the heat and pressure.

In addition, the first and second exposed pitch electrodes are each provided to form a plurality of groups (群).

In addition, the liquid crystal panel includes a plurality of first exposed pitch electrode groups respectively along two adjacent edges, and the printed circuit board is divided into a gate driving circuit and a data driving circuit connected to each of the two edges of the liquid crystal panel. Each of the plurality of second exposed pitch electrode groups may be provided, and the TCP may be provided with a plurality of interconnecting the first and second exposed pitch electrode groups corresponding to each other.

In another aspect, the present invention provides a TCP for connecting a plurality of first and second exposed pitch electrodes arranged at minute intervals along at least one edge of each of a liquid crystal panel and a printed circuit board on which a driving circuit thereof is mounted. First and second contact pitch electrodes corresponding to each of the first and second exposed pitch electrodes are provided along edges overlapping edges, each of which is equally spaced from the first and second exposed pitch electrodes. It provides a liquid crystal panel TCP, characterized in that the distance between the array gradually increases at a certain rate as it moves away from this on the basis of any one point.

In this case, the first and second exposed pitch electrodes and the first and second contact pitch electrodes are respectively connected by applying heat and pressure in a direction gradually away from the point with ACF interposed therebetween, in this case, the constant ratio Increasing the arrangement interval is characterized in that for the compensation for the length of the TCP by the heat and pressure bar, the present invention will be described in more detail with reference to the drawings.

4 is a perspective view of the liquid crystal panel assembly according to the present invention. Similarly to the general case, the lower array substrate 52 and the upper color filter substrate 58 are bonded to each other with the liquid crystal layer interposed therebetween. .

Although not shown in the drawing, the array substrate 52 has a plurality of gate lines and data lines arranged vertically and horizontally to define pixels. Each pixel includes a thin film transistor and a pixel electrode corresponding thereto. The color filter substrate 58 is provided with a color filter layer including a lattice-like black matrix covering each pixel boundary of the array substrate 52 and red, green, and blue color filters corresponding to each lattice, and a common electrode.

The printed circuit board 90 is connected to the plurality of TCPs 100 along at least one edge of the liquid crystal panel 50. In this case, for example, the printed circuit board 90 may be largely divided into two types, one of which may be equipped with a gate driving circuit for outputting a scan signal applied to each gate line, and the other may have each data line. A data driver circuit for outputting an image signal applied to the apparatus may be mounted.

In this case, at least one edge of the array substrate 52 constituting the liquid crystal panel 50 is exposed to the outside of the color filter substrate 58, and the plurality of TCPs 100 are printed with the edges of the array substrate 52 exposed to the outside. The edge of the circuit board 90 is connected.

This will be described with reference to FIG. 5, which is an exploded perspective view of an in-circuit B portion corresponding to any one of the plurality of TCP 100.

As shown, the array substrate 52 is relatively outwardly exposed along at least one edge of the liquid crystal panel 50, and the plurality of first exposed pitch electrodes 56 drawn from each gate line or data line are shown. Are arranged. In this case, each of the first exposed pitch electrodes 56 may be divided into a plurality of groups, and each of the first exposed pitch electrodes 56 may be arranged at minute equal intervals.

Similarly, a plurality of second exposed pitch electrodes 92 are provided along the edges of the printed circuit board 90 to scan output the scan signal voltage to each gate line or to output an image signal to each data line. Each of them may be divided into a plurality of groups, and in each group, a plurality of second exposed pitch electrodes 92 are arranged at minute equal intervals.

One-to-one correspondence with the first exposed pitch electrode 56 and the second exposed pitch electrode 92 in each group along both ends of the TCP 100 covering and connecting the first and second exposed pitch electrodes 56 and 92. A plurality of first and second contact pitch electrodes 102 and 104 correspondingly connected are arranged. Accordingly, the first exposed pitch electrode 56 of the array substrate 52 and the first contact pitch electrode 102 of one end of the TCP 100 and the second exposed pitch electrode 92 of the printed circuit board 90 and the other TCPs. The second contact pitch electrodes 104 at the ends are connected one-to-one, respectively, to electrically connect the printed circuit board 90 and the array substrate 52.

At this time, in the present invention, the TCP 100, the array substrate 52, and the printed circuit board 90 are connected by a TAB process. The TAB process is performed by mobilizing an ACF and a heating tool without being different from the general case.

That is, this will be described with reference to FIG. 6, which is a cross section taken along the line VI-VI of FIG. 4, which shows the first exposed pitch electrode 56 and the TCP 100 of the array substrate 52. Note that the same applies to the second contact pitch electrode 104 of the printed circuit board 90 and the second contact pitch electrode 104 of the TCP 100. .

As shown in this figure, the ACF 112 is interposed between the first exposed pitch electrode 56 and the first contact pitch electrode 102 corresponding to each other, and heat and heat are applied using a predetermined heating tool 114 from the outer surface of the TCP 100. Connect with pressure.

However, in this case, the first contact pitch electrode 102 of the TCP 100 according to the present invention maintains the same distance as the first exposed pitch electrode 56 despite the length extension of the TCP 100 itself due to heat and pressure. It can be confirmed that the one-to-one correspondence is connected, which takes into account the length of the TCP 100 due to heat and pressure in determining the distance between the first contact pitch electrodes 102 arranged at the TCP 100 ends. This can be done by differential design to compensate for this.

That is, FIG. 7 is a plan view showing the distance between the first contact pitch electrodes 102 of the TCP 100 according to the present invention in comparison with the first exposed pitch electrodes 56 of the array substrate 52 represented by a phantom dotted line. As shown in the case of referencing this together, the first contact pitch electrode 102 of the TCP 100 gradually decreases as the distance between the center portion, which is a random point, on both sides thereof, and thus, the heating tool ( In the case where heat and pressure are applied in a direction away from the center of the TCP 100 using 114), the length of the TCP 100 itself is elongated to coincide with each other as shown in FIG.

In other words, the first contact pitch electrode 102 arranged along one end of the TCP 100 may be separated from the first contact pitch electrode 102 at an equal distance from the first exposed pitch electrode 56 of the array substrate 52. It is designed to differentially reduce the array spacing at a constant rate, and to reduce the sequence spacing according to such a constant rate to compensate for the length extension of the TCP 100 due to heat and pressure applied in the TAB process.

Therefore, when the TAB process is completed, the first exposed pitch electrode 56 and the first contact pitch electrode 102 maintain the same distance to each other and correspond one to one.

On the other hand, in this case, according to the position of one point of the TCP (100) where the heating tool 114 is initially contacted, the reduction ratio of the distance between the first contact pitch electrodes away from it may be different from one another. As it is, when heat and pressure are applied to gradually move away from the center portion of the first contact pitch electrode 102 of the TCP 100 to both sides thereof, the center portion has a pitch of 40 µm and the total number of electrodes is 400. The pitch of both outermost portions is reduced to about 24 to 28 μm, ie approximately 60 to 70% of the central portion.

When the first contact point of the heating tool is the outermost side of the first contact pitch electrode 102, the pitch of the outermost side farthest away from the same condition is reduced to 40 to 50% by about 12 to 16 μm under the same conditions as before. do.

However, it will be readily apparent to those skilled in the art that such specific values may vary depending on the heat and pressure of the heating tool 114 or the material of the TCP 100 and the number and pitch intervals of the first exposure and contact pitch electrodes. As it is, the greatest feature of the present invention is that the gap between the first contact pitch electrodes 102 is differentially designed in consideration of the elongation of the TCP 100 itself, which may be generated during the physical bonding process using heat and pressure.

Therefore, it is obvious to those skilled in the art that various modifications and changes can be made without departing from the spirit of the present invention. The facts will become more apparent from the following claims.

As described above, the liquid crystal panel assembly according to the present invention is designed to differentially design a contact pitch electrode of TCP in consideration of heat and pressure applied in a TAB process, thereby providing reliability in one-to-one correspondence with the exposed pitch electrode. There is an advantage.                     

Therefore, the short-circuit or electrical disconnection may be remarkably reduced, and as a result, the image quality of the liquid crystal panel may be improved by eliminating the line defect that appears in the form of a line in the image.

Claims (8)

A liquid crystal panel having a plurality of first exposed pitch electrodes arranged along at least one edge to maintain a predetermined interval; A printed circuit board on which a driving circuit of the liquid crystal panel is mounted, and a plurality of second exposed pitch electrodes for maintaining a predetermined interval are arranged along at least one edge; A plurality of first and second contact pitch electrodes corresponding to each of the first and second exposed pitch electrodes are provided along the ends overlapping the edges of the liquid crystal panel and the printed circuit board, respectively. And a TCP in which an array interval gradually decreases at a predetermined rate as the second exposure pitch electrode is separated from the reference point at an equal distance from the second exposed pitch electrode. The method of claim 1, And the first and second exposed pitch electrodes and the first and second contact pitch electrodes are connected to each other by applying heat and pressure in a direction gradually away from the point with the ACF therebetween. The method of claim 2, The arrangement interval reduction according to the constant ratio is a liquid crystal panel assembly, characterized in that for compensation for the length of the TCP by the heat and pressure. The method of claim 1, And the first and second exposed pitch electrodes are formed to form a plurality of aggregate groups, respectively. The method of claim 4, wherein The liquid crystal panel includes a plurality of first exposed pitch electrode groups respectively along two adjacent edges, The printed circuit board is divided into a gate driving circuit and a data driving circuit connected to each of two edges of the liquid crystal panel, and each of the plurality of second exposed pitch electrode groups is provided. The TCP is a liquid crystal panel assembly, characterized in that provided with a plurality of interconnecting the first and second exposed pitch electrode group corresponding to each other. As a TCP for connecting a plurality of first and second exposed pitch electrodes arranged at minute intervals along at least one edge of each of a liquid crystal panel and a printed circuit board on which a driving circuit thereof is mounted, First and second contact pitch electrodes corresponding to each of the first and second exposed pitch electrodes are provided along end portions overlapping the edges of the first and second exposed pitch electrodes, respectively, each of the first and second exposed pitch electrodes. TCP for the liquid crystal panel, characterized in that the interval between the array gradually increases as the distance away from it with respect to any one point forming the same interval as. The method of claim 6, And the first and second exposed pitch electrodes and the first and second contact pitch electrodes are connected to each other by applying heat and pressure in a direction gradually away from the point with the ACF therebetween. The method of claim 7, wherein The increase in the arrangement interval according to the constant ratio TCP for the liquid crystal panel, characterized in that for compensation for the length of the TCP by the heat and pressure.

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