KR100637058B1 - Liquid Crystal Display - Google Patents

Abstract

The present invention relates to a liquid crystal display using a contact pad package in which contact pads are arranged to increase the pitch of the contact pads.

According to an exemplary embodiment of the present invention, a liquid crystal display (LCD) includes a liquid crystal panel having thin film transistors and a liquid crystal cell matrix in which liquid crystal cells are formed in a matrix form, and a tape carrier on which driving integrated circuits driving the liquid crystal cell matrix are mounted and bonded to the liquid crystal panel. And a plurality of contact pads formed in a zigzag form on the liquid crystal panel and the tape carrier package to electrically connect the package, the liquid crystal cell matrix, and the driving integrated circuits.

According to the present invention, as the contact pads are arranged in a plurality of rows in a zigzag form, not only the spacing between the contact pads can be increased but also the pitch of the contact pads can be increased.

Description

Liquid Crystal Display

1 is a view showing a liquid crystal panel with TCP attached to a pad region;

FIG. 2 is a diagram illustrating an arrangement of contact pads included in the contact pad package shown in FIG. 1.

3 illustrates a contact pad package of a liquid crystal display according to an exemplary embodiment of the present invention.

4A is a partial perspective view of a TCP having a contact pad package according to an embodiment of the present invention, and FIG. 4B is a cross-sectional view of the TCP illustrated in FIG. 4A taken along line AA ′ in the vertical direction.

FIG. 5A is a partial perspective view of a pad area of a liquid crystal panel having a contact pad package according to an exemplary embodiment of the present invention, and FIG. 5B is a cutaway view of the pad area shown in FIG. 5A along a line B-B 'in a vertical direction. Cross-section.

<Brief description of symbols for the main parts of the drawings>

10: upper substrate 12, 32: lower substrate

13: pad area 14, 21: TCP

15, 20: contact pad package 16, 22: contact pad of the liquid crystal panel

18, 24: TCP's contact pad 23: Base film

25, 31: conductive region 26, 33: non-conductive region

27, 34: land 28, 36: conductive layer

29 insulating layer 30 pad region of liquid crystal panel

38: passivation film 40: transparent electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact pad bonded with a tape automated bonding (TAB) method, and more particularly, to a contact pad package in which contact pads are arranged to increase a pitch of the contact pad, and a liquid crystal display using the same. It is about.

In general, a liquid crystal display (LCD) displays an image corresponding to a video signal on a liquid crystal panel by adjusting light transmittance of liquid crystal cells arranged in a matrix form according to a video signal. To this end, a liquid crystal display device includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix form between two glass substrates, an integrated circuit (hereinafter referred to as an IC) for driving the liquid crystal cells, An electrical signal conversion circuit unit for supplying a video signal, a timing signal, and a power supply voltage to the driving ICs is provided. The driving ICs are generally manufactured in the form of chips, and the electrical signal conversion circuits are manufactured in the form of printed circuit boards. The driving IC chips are mounted on a tape carrier package (TCP) by a tape automated bonding (TAB) method or mounted on the surface of a liquid crystal panel by a chip on glass (COG) method. Here, the driving IC chips mounted on the TCP are electrically connected to the liquid crystal cell matrix of the liquid crystal panel through the TCP. In this case, TCP is connected to the pad area provided at the edge of the liquid crystal panel.

In fact, as illustrated in FIG. 1, the liquid crystal panel is provided with a pad region 13 in which contact pads are formed at edges of the lower substrate 12 that do not overlap with the upper substrate 10. A matrix liquid crystal cell is formed between the upper substrate 10 and the lower substrate 12. A TCP 14 having a driver IC chip mounted thereon is attached to the pad region 13 of the lower substrate 12. Accordingly, the contact pad serves to supply the supply signal from the driver IC chip to the liquid crystal cell matrix. Here, the contact portion of the pad area 13 and the TCP 14, that is, the contact pad package, is as shown in FIG. 2. In the contact pad package 15 of the pad region 13, contact pads 16 connected to the electrode lines (gate lines or data lines) of the liquid crystal cell matrix are disposed in a straight line form. The contact pads 18 formed on the TCP 14 corresponding to the row of contact pads 16 are also arranged in a row. By aligning the contact pads 16 of the liquid crystal panel and the contact pads 18 of the TCP 14 and attaching the TCP 14 to the liquid crystal panel, the drive signals from the driving integrated circuit mounted on the TCP 14 are liquid crystal. It can supply to the liquid crystal cell matrix of a panel.

Meanwhile, as the liquid crystal display device becomes higher in size and size, the number of electrode lines formed in the liquid crystal cell matrix increases. As the number of electrode lines increases, the liquid crystal panel connecting each electrode line and the driving IC chip and the contact pads on the TCP are gradually becoming fine pitches. However, when the contact pad is finely pitched, a large amount of short-line coupling due to misalignment and conductive foreign matter occurs during the TAB process.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of increasing the pitch of a contact pad by changing the arrangement of the contact pads in a zigzag shape.

Another object of the present invention is to provide a liquid crystal display device which can cope with high resolution and size of a panel by using the contact pad package.

In order to achieve the above object, a liquid crystal display according to the present invention includes a liquid crystal panel having a thin film transistor and a liquid crystal cell matrix in which liquid crystal cells are formed in a matrix form, and driving integrated circuits for driving the liquid crystal cell matrix are mounted. A tape carrier package adhered to the panel, and a plurality of contact pads formed in a zigzag form on the liquid crystal panel and the tape carrier package so as to be electrically connected to the liquid crystal cell matrix and the driving integrated circuits. do.

Other objects and advantages of the present invention in addition to the above object will become apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 3 to 5B.

3 illustrates a contact pad package of a liquid crystal display according to an exemplary embodiment of the present invention. The contact pad package 20, that is, the contact pads 22 of the liquid crystal panel positioned in the junction of the liquid crystal panel and the TCP and the contact pads 24 of the TCP opposite thereto are arranged in a plurality of rows in a zigzag form. As such, the contact pads 22 and 24 of the liquid crystal panel and the TCP are arranged in a plurality of rows in a zigzag form, thereby increasing the spacing and pitch of the adjacent contact pads 22 and 24. The pitch of the adjacent contact pads 22, 24 is the distance between the centers of the adjacent contact pads 22, 24, so that the contact pads 22, 24 are arranged in a zigzag form as in the present invention. As a result, the pitches of the adjacent contact pads 22 and 24, that is, the width and the spacing of each of the contact pads 22 and 24 can be increased. Accordingly, even when the spacing and pitch between the contact pads 22 and 24 become narrower as the number of electrode lines increases, the contact pads 22 and 24 are arranged in a zigzag form, thereby making the contact pads 22, 24, it is possible to prevent misalignment or short between adjacent contact pads 22 and 24 upon interconnection. For example, as shown in FIG. 3, the first row of contact pads 22 and 24 and the second row of contact pads 22 and 24 are arranged in a zigzag shape, thereby horizontally adjacent contact pads 22. , 24) can further increase the spacing between. In detail, when the liquid crystal panel and the contact pads 22 and 24 of the TCP are arranged in a two-column zigzag form as shown in FIG. 3, the first (or even) electrode line is arranged in the first column. The odd (or even) contact pads 22, 24 that are connected to the field. In the second column, even-numbered (or odd-numbered) contact pads 22 and 24 are connected to the even-numbered (or odd-numbered) electrode lines. As a result, the pitch of the contact pads 22 and 24 can also be increased. In practice, when the contact pads are arranged in a straight line as in the prior art, their pitch can only be set to about 75 μm maximum, while the pitches of the jig-zag contact pads 22 and 24 of the present invention can be up to 150 μm. It can be set to a degree. In addition, the distance between the contact pads disposed in a conventional straight line type can be set only at a maximum of about 45 μm, while the distance between the contact pads 22 and 24 of the present invention can be set to about 75 μm. Thus, when the contact pads 22 and 24 of the liquid crystal panel and the TCP are arranged in a plurality of columns in a zigzag form, the pad region and the TCP of the liquid crystal panel have a changed structure as shown in FIGS. 4A to 5B. do.

4A illustrates a partial perspective view of a TCP having a contact pad package according to an embodiment of the present invention, and FIG. 4B illustrates a cross-sectional view of the TCP illustrated in FIG. 4A taken along line AA ′ in the vertical direction. On the base film 23 of the TCP 21 shown in FIGS. 4A and 4B, line-shaped lands 27 formed of the conductive region 25 and the non-conductive region 26 are formed side by side. The conductive region 25 to which the conductive material is applied is a portion corresponding to the contact pad 24 of the TCP 21 and is alternately positioned for each land 27. In other words, the conductive area 25 of the TCP 21, that is, the contact pad 24, is arranged in a zigzag shape. An insulating material is applied to the non-conductive region 26 located on the opposite side of the conductive region 25 from the land 27. The conductive layer connected to the conductive region 25 is positioned below the non-conductive region 26. The vertical structure of the TCP 21 having such a structure is as shown in Fig. 4B.

The line type conductive layer 28 is positioned on the base film 23. In the conductive layer 28, the thickness of the conductive layer 28 corresponding to the non-conductive region 26 is set smaller than the thickness of the conductive layer 28 corresponding to the conductive region 25. An insulating layer 29 is formed on the conductive layer 28 and the base film 23 corresponding to the non-conductive region 26. Accordingly, the conductive region 25 corresponding to the contact pad 24 is exposed in a zigzag form on the TCP 21.

5A illustrates a partial perspective view of a pad area of a liquid crystal panel having a contact pad package according to an exemplary embodiment of the present invention, and FIG. 5B illustrates a B-B 'line in a vertical direction of the pad area of the liquid crystal panel shown in FIG. 5A. It shows the cross-sectional view cut along. In the pad region 30 of the liquid crystal panel illustrated in FIGS. 5A and 5B, lands 34 including the conductive region 31 and the non-conductive region 33 are formed side by side. The conductive region 31 in the land 34 corresponds to the contact pad 22 of the liquid crystal panel, and is alternately positioned for each land 34. In other words, the conductive region 31, that is, the contact pad 22, is arranged in a zigzag shape on the liquid crystal panel. The non-conductive region 33 to which the insulating material (ie, the protective film) is applied is positioned on the opposite side of the conductive region 31 in the land 34. The conductive layer connected to the conductive region 31 is positioned below the non-conductive region 33. The conductive region 31 and the non-conductive region 33 of the liquid crystal panel pad region 30 are positioned to face the TCP 21 illustrated in FIG. 4A. The vertical structure of the liquid crystal panel pad region 30 having such a structure is as shown in FIG. 5B.

First, the conductive layer 36 is formed on the lower substrate 32 together with the gate line or data line of the liquid crystal cell matrix. The conductive layer 36 has a structure in which Al / Mo is stacked like a gate line. In this case, as shown in FIG. 5B, when the conductive layer 36 is composed of two layers, the layer formed on the upper portion may have a form surrounding the layer formed on the lower portion. The passivation film 38 is entirely coated on the lower substrate 32 on which the conductive layer 36 is formed, and then patterned to expose only the conductive layer 36 corresponding to the conductive region 31. In this way, the transparent electrode 40 for protecting the conductive layer 36 is formed on the exposed conductive layer 31. Accordingly, only the conductive region 31 corresponding to the contact pad 22 is exposed to the pad region 30 of the liquid crystal panel in a zigzag form.

In this manner, the conductive areas 25 and 31 on the liquid crystal panel and the TCP arranged in a zigzag shape, that is, the contact pads 22 and 24 are aligned, so that the TCP 21 is placed on the pad region 30 of the liquid crystal panel. By attaching, the driving IC chip and the liquid crystal cell matrix are electrically connected.

As described above, according to the contact pad package according to the present invention, as the contact pads are arranged in a multi-layer zigzag shape, the spacing and pitch between the contact pads can be increased. Accordingly, according to the liquid crystal display device using the contact pad package according to the present invention, the pitch of the contact pad and the distance between the contact pads can be increased, so that the fineness of the contact pad is increased in response to the enlargement and high definition of the panel, which increases the number of electrode lines. It is possible to reduce the shortness of the contact pad due to misalignment of the TAB process and conductive foreign matter due to the pitch.

Meanwhile, in the exemplary embodiment of the present invention, only the case where the contact pad package is applied to the liquid crystal display is described as an example, but the present invention can be applied to all devices using the contact pad requiring fine pitch.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, 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.

Claims (5)

A liquid crystal panel having a liquid crystal cell matrix in which thin film transistors and liquid crystal cells are arranged in a matrix form; A tape carrier package mounted with driving integrated circuits driving the liquid crystal cell matrix and bonded to the liquid crystal panel; Each of the conductive regions exposing the first line type conductive layers electrically connected to the driving integrated circuits in the tape carrier package and the non-conductive areas having the first insulating layer formed on the first line type conductive layers are jig-shaped. First contact pads arranged in a jag shape; And second contact pads electrically connected to the liquid crystal cell matrix and electrically connected to conductive areas of the first contact pads. delete The method of claim 1, And a conductive region of the first contact pads and a non-conductive region of the first contact pads are alternately formed. The method of claim 1, The second contact pads may include conductive regions exposing second line type conductive layers electrically connected to the liquid crystal cell matrix on the liquid crystal panel, and non-conductive areas having a second insulating layer formed on the second line type conductive layers. The liquid crystal display device, characterized in that arranged in a zigzag form, respectively. The method of claim 4, wherein The conductive region of the second contact pads and the non-conductive region of the second contact pads are formed at alternating positions such that the conductive regions of the second contact pads and the conductive regions of the first contact pads are connected to each other. Display.

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