KR100684779B1 - Liquid crystal display panel - Google Patents

Abstract

The present invention relates to a liquid crystal display panel which can be more compact and lighter while minimizing a wiring area for connecting electrodes and electrode pads in a liquid crystal display panel to expand an effective screen portion on which a screen is actually formed.

First and second substrates and first and second electrodes formed in a stripe pattern perpendicularly intersecting with each other on inner surfaces of the first and second substrates facing each other to form a plurality of pixels, and the pair of electrodes A plurality of first electrode pads having liquid crystals oriented therebetween, one end of the first electrode extending in the longitudinal direction of the first electrode, and coaxially with the first electrode pad, and having the number of second electrodes The present invention provides a liquid crystal display panel including a plurality of second electrode pads provided, and a multi-layer connection part including a plurality of connection members individually connecting one end of the second electrodes and a specific second electrode pad.

Liquid crystal display, liquid crystal panel, wiring, wiring electrode, transparent electrode, pixel electrode, common electrode

Description

Liquid crystal display panel

1 is a plan view of a liquid crystal display panel according to the present invention.

2 is a cross-sectional view of a liquid crystal display panel according to the present invention.

3 is an enlarged view of a multilayer connection.

4 is a cross-sectional view taken along a line A-A of FIG. 3.

5 is a cross-sectional view taken along line BB of FIG. 3.

6 is a plan view of a liquid crystal display panel according to the prior art.

The present invention relates to a liquid crystal display panel that can be more compact and lighter while minimizing a wiring area for connecting electrodes and electrode pads in a liquid crystal display panel to expand an effective screen portion on which a screen is actually formed.

A liquid crystal display device uses a dielectric anisotropy of a liquid crystal whose twist angle changes according to an applied voltage, and thus does not transmit or transmit back light or light emitted from the pixel for each pixel. Due to its low voltage driving, it is widely used in display devices of portable electronic devices to large display devices.

The liquid crystal display device includes a liquid crystal display panel in which liquid crystal is injected and sealed between two substrates on which an indium tin oxide (ITO) transparent electrode is formed, a driving circuit unit for applying a voltage signal to the electrode, and a driving large scale integration (LSI). Are combined to form one display module.

The driving LSI is mounted on a printed circuit board by a chip on board (COB) method, a polymer film (tap package) by a tape automated bonding (TAB) method, or a glass of a liquid crystal display panel by a chip on glass (COG) method. When the driving LSI is mounted in a COB method, the liquid crystal display panel and the printed circuit board are connected by a known heat seal, and when the driving LSI is mounted in a TAB method, the tap package is used. Both ends of the wiring are connected to the liquid crystal display panel and the printed circuit board, respectively, and a structure for connecting them is generally used.

In all combination methods, the liquid crystal display panel forms electrode pads on the periphery of the glass substrate so as to receive a voltage signal from the driving circuit unit. In particular, the liquid crystal display panel forms both a pixel electrode pad and a common electrode pad at one end of the glass substrate. Miniaturization and weight reduction of the display module are aimed at.

6 is a plan view of a liquid crystal display module according to the prior art, schematically showing a wiring pattern of an ITO transparent electrode. The pixel electrode 7 and the common electrode 9 are actually spaced apart from each other, but are shown on the same plane in FIG. 6 for convenience of description. As shown in the drawing, in order to form both the pixel electrode pad 3 and the common electrode pad 5 at one end of the glass substrate 1, the lower end of the pixel electrode 7 may be extended to form a lower center portion of the glass substrate 1. The pixel electrode pads 3 are concentrated on the common electrode pads, the common electrode pads 5 are disposed on the left and right sides of the pixel electrode pads 3, and one end of the common electrode 9 and the common electrode pads 5 are transparent. The method of connecting by ITO wiring 11 is mainly used.

However, the liquid crystal display module of the above-described configuration is essential to the left and right sides of the effective screen portion (shown in dotted lines) in which the ITO wiring 11 connecting the one end of the common electrode 9 and the common electrode pad 5 is actually configured. Since the size of the effective screen portion in the liquid crystal display panel is increased due to the area of the ITO wiring 11, the size of the effective screen portion may be adversely affected.

Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to minimize the area occupied by ITO wiring in the liquid crystal display panel, thereby effectively increasing the size of the effective screen portion and to reduce the size and weight of the liquid crystal display panel. To provide.

In order to achieve the above object, the present invention,

The first and second substrates,

First and second electrodes formed in a stripe pattern vertically intersecting with each other on inner surfaces of the first and second substrates facing each other, and constituting a plurality of pixels;

A liquid crystal oriented between the pair of electrodes,                     

A plurality of first electrode pads having one end of the first electrode extending in a length direction of the first electrode;

A plurality of second electrode pads positioned on the same axis as the first electrode pad and provided with the number of second electrodes;

The present invention provides a liquid crystal display panel including a multi-layered connection part including a plurality of connection members individually connecting one end of the second electrodes to a specific second electrode pad.

Since the multi-layer connection part is composed of individual connection members laminated in multiple layers, the wiring area required on the left and right sides of the effective screen part is an area occupied by one connection member. This can effectively reduce the area occupied by the wirings in the liquid crystal display panel.

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

1 is a plan view of a liquid crystal display module according to the present embodiment, schematically showing an ITO wiring pattern, and FIG. 2 shows a cross section of the liquid crystal display module according to the present embodiment.

As shown in the figure, the liquid crystal display module has a transparent ITO conductive film formed on the inner surfaces of the first and second substrates (hereinafter, referred to as 'upper substrate' 2 and 'lower substrate' 4), respectively. Functions as an electrode (hereinafter referred to as a 'pixel electrode' 6) and a second electrode (hereinafter referred to as a 'common electrode' 8), and the entire substrate on which the pixel electrode 6 and the common electrode 8 are formed. The insulating film 10 and the alignment film 12 are formed over, and the liquid crystal 14 is injected-sealed into the upper and lower substrates 2 and 4 which are integrally bonded together. As shown in FIG. 2, the pixel electrode 6 and the common electrode 8 are actually spaced apart from each other, but are shown on the same plane in FIG. 1 for convenience of description.

In addition, a pair of polarizing plates 14 for linearly illuminating back light or externally incident light are attached to the outer surfaces of the upper substrate 2 and the lower substrate 4 for the actual display function.

Here, the pixel electrode 6 and the common electrode 8 receive a voltage signal from a driving circuit (not shown) to change the twist angle of the liquid crystal 14 for each pixel. For this purpose, the pixel electrode 6 and the common electrode ( 8) is connected to each of the pixel electrode pads 16 and the common electrode pads 18 which are connected to the wiring of the driving circuit unit. In particular, the electrode pads are all disposed at one end of the substrate in order to reduce the size and weight of the liquid crystal display module. .

As such, when both the pixel electrode pad 16 and the common electrode pad 18 are disposed at one end of the substrate, the present invention is common in order to minimize the wiring area required on the left and right sides of the effective screen portion (shown by the dotted lines). Provided is a multi-layer connecting portion 20 provided with a plurality of connecting members connecting one end of the electrode 8 to a specific common electrode pad in multiple layers.

In more detail, the plurality of pixel electrode pads 16 are disposed at the bottom center of the substrate, and the number of common electrode pads 18 is equal to the number of common electrodes 8 on the same axis as the pixel electrode pads 16. Place it. For particularly effective electrode pad arrangement, the pixel electrode pads 16 may be concentrated in the lower center of the substrate, and the common electrode pads 18 may be bisected on the left and right sides of the pixel electrode pads 16.

As a result, the lower end of the vertically arranged pixel electrode 6 extends in the longitudinal direction of the pixel electrode 6 to connect with the respective pixel electrode pads 16, and the plurality of common electrodes 8 are arranged horizontally. The upper common electrode 8 and the lower common electrode pad 18, and the upper common electrode 8 and the right common electrode pad 18 are connected to each other by using the multi-layer connection 20.

FIG. 3 is an enlarged view of one multi-layer connecting portion connecting the lower common electrode and the left common electrode pad. FIG. 4 is a cross-sectional view of the line A-A of FIG. 3, and FIG. 5 is a cross-sectional view of the line B-B of FIG.

It is assumed that the first common electrode 8a is the first common electrode 8a that is disposed closest to the common electrode pad 18 among the plurality of common electrodes 8, and the common electrode pad is located at the outermost position among the plurality of common electrode pads 18. From the first common electrode pad 18a, the multilayer connection part 20 includes a first connection member 20a connecting the first common electrode 8a and the first common electrode pad 18a, and the first connection electrode 20a. The second connecting member 20b, which covers the connecting member 20a and connects the second common electrode 8b and the second common electrode pad 18b, is formed in a multi-layered structure sequentially stacked.

More specifically, when the first common electrode pad 18a is positioned on the same vertical line as one end of the common electrode 8, the first connecting member 20a having a straight shape has both ends of the first common electrode ( The ends of 8a and the first common electrode pad 18a are respectively connected to and connected to each other, and the second connecting member 20b having a '??' shape is formed at both ends thereof while covering the first connecting member 20a. The ends of the second common electrode 8b and the second common electrode pad 18b are respectively connected to each other.                     

As described above, the connecting member to be attached later covers the connecting members attached first, and the final connecting member is connected to the last common electrode having both ends disposed at the top and the last common electrode pad located at the innermost, respectively. Connect it.

As described above, if one terminal of the common electrode 8 located at the bottom of the common electrode 8 and the common electrode pad 18 positioned at the outermost part are sequentially connected, the last connecting member may be sequentially placed on the first connecting members. It can be laminated.

As such, each connection member 20a, 20b ... connecting one end of the common electrode 8 and the common electrode pad 18 may be formed of a heat seal wire. The thermocompression wiring is a configuration in which a conductive paint is screen printed on a polyester film and an insulating hot melt resin is laminated. Both ends of the thermocompression wiring are connected to one end of the common electrode 8 and the common electrode pad 18, respectively. Once positioned, pressurized using a thermocompression apparatus can electrically connect them in a simple process.

In another embodiment, the connection members 20a, 20b ... may be made of a flexible printed circuit (FPC) in which wiring is printed therein. Wiring layers exposed at both ends of the FPC are positioned at one end of the common electrode 8 and the common electrode pad 18, and interposed therebetween. The anisotropic conductive film is a compressed resin in which fine conductive particles are mixed. When pressed using a thermocompression bonding apparatus, one end of the common electrode, the wiring of the FPC, the wiring of the FPC, and the common electrode pad are electrically contacted by the minute conductive particles inside the anisotropic conductive film.                     

As described above, in the connection member made of thermocompression wiring or FPC, the second connection member 20b is sequentially stacked on the first connection member 20a, and the third connection member 20c is sequentially stacked on the second connection member 20b. As a result, the multilayer connection portion 20 occupies the wiring area as much as one connection member width on the left side of the effective screen portion.

In addition, since the multi-layer connection part 20 connects the upper common electrode and the right common electrode wire in the same manner as described above, the multi-layer connection part 20 occupies a wiring area equal to the width of one connection member on the right side of the effective screen part.

Therefore, the liquid crystal display panel according to the present embodiment electrically connects the plurality of common electrodes 8 and the common electrode pads 18 while sequentially stacking the connection members. Thus, the common electrode 8 and the common electrode pads ( It is possible to minimize the wiring area connecting the 18).

As a result, the area of the effective screen portion of which the screen is actually formed can be effectively extended with respect to the liquid crystal display panel of the same area, and the liquid crystal display panel and the entire liquid crystal display module can be made smaller and lighter than that of the liquid crystal display panel having the effective area of the same area It has the advantage to do it.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

 As described above, the present invention can minimize the wiring area outside the effective screen by connecting each common electrode and the common electrode pad separately using the multi-layer connection. As a result, the width of the effective screen portion can be effectively improved for the liquid crystal display panel of the same area, and the liquid crystal display panel and the liquid crystal display module can be effectively miniaturized and reduced in weight with respect to the effective screen portion of the same area.

Claims (6)

A first substrate and a second substrate, First and second electrodes formed in a stripe pattern vertically intersecting with each other on inner surfaces of the first and second substrates facing each other, constituting a plurality of pixels; Liquid crystal oriented between the pair of electrodes, A plurality of first electrode pads in which one end of the first electrode extends in a length direction of the first electrode, A plurality of second electrode pads positioned on the same axis as the first electrode pad and provided with the number of the second electrodes; Multi-layered connection part in which each connection member for individually connecting one end of the second electrodes and a specific second electrode pad is integrally laminated Including, And a cross-sectional height at each second electrode position of the multi-layered connection cut perpendicular to the second substrate increases as the second electrode gets closer to the second electrode pad. The method of claim 1, The multilayer connection part, A first connection member having both ends attached to one end of the first second electrode closest to the second electrode pad and the first second electrode pad located at the outermost portion; A second connection member covering both the first connection member and both ends attached to one end of the second second electrode and the second second electrode pad; And And a multilayer structure covering the connection members to one end of the last second electrode and a final connection member having both ends attached to the last second electrode pad. The method of claim 1, The first electrode pad is centrally disposed on one side end of the substrate, and the second electrode pad is bilaterally disposed on both sides of the first electrode pad. The method of claim 3, And the second electrodes are bisected and connected to respective second electrode pads through respective multilayer connections. The method of claim 1, A liquid crystal display panel wherein said connection member is made of thermocompression wiring. The method of claim 1, A liquid crystal display panel wherein the connection member is made of a flexible printed circuit board (FPC).

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