KR100251093B1 - Lcd panel having a large area - Google Patents

Abstract

PURPOSE: An LCD panel with a large area is provided to supply a structure to connect common electrodes by connecting and pasting small type LCD panels. CONSTITUTION: Small type LCD panels are connected and pasted with exposing a common electrode(133). In other words, small type LCD panels(101a,101b) are connected with being turned over each other. A space of a connected substrate is filled with an electroconductive resin(300) and the electroconductive resin is hardened to connect common electrodes each other. A seal(118) intervenes between small type LCD panels(101a,101b) and an upper board(120) and a lower board are coalescent dislocatedly. A dot(310) made of Ag is formed in an end of a gate bus line(160) of the small-size LCD panel(101a). The dot(310) and the gate bus line are connected and pasted each other. A space of a connected substrate is filled with an electroconductive resin film and the electroconductive resin film is hardened to connect small type LCD panels very solidly.

Description

Large Area Liquid Crystal Display Panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large area liquid crystal display panel that can be used in a large TV, a guide display device, a computer having a large screen, or the like installed in a museum, a train station or an airport.

Large-area liquid crystal display panels of 20 inches or more are constructed by connecting a plurality of small liquid crystal display panels 1a and 1b as shown in FIG. 1 due to various manufacturing problems.

Each of the small liquid crystal display panels 1a and 1b has a gate bus line 60 and a data bus line 70 formed in a matrix on a lower plate 10 and functions as a pixel electrode 40 and a switching element in an area where the gate bus line and the data bus line cross each other. TFT 30 is formed.

The TFT includes a gate electrode branching at the gate bus line 60, a source electrode branching at the data bus line 70, a drain electrode formed at a position facing the source electrode at a predetermined interval, and the like; Is in contact with the pixel electrode.

The gate drive driver 65 including a circuit for attaching the small liquid crystal display panels 1a and 1b configured as described above and applying a gate signal to each of the small liquid crystal display panels is connected to each gate bus line 60 through the gate pad 66. Connect. In addition, a data driving driver 75 having a circuit for applying a data signal is connected to each data bus line 70 through a data pad 76.

The large area liquid crystal display panel of the above structure will be described in more detail with reference to the cross-sectional view of FIG.

In the attached liquid crystal display panels 1a and 1b, a gate electrode 60a branched from the gate bus line is formed on the lower plate 10. A gate insulating film 50 covering the gate electrode 60a is formed, and a semiconductor layer 90 is formed in an island shape on the gate insulating film of the gate electrode part, and ohmic contact layers 92a and 92b separated on both sides are formed on the semiconductor layer. A source electrode 70a is formed to branch from the data bus line 70 formed on the gate insulating layer to contact the ohmic contact layer 92a, and a drain electrode 70b to contact the ohmic contact layer 92b is formed. By forming the above structure, the TFT functioning as a switching element is completed, and the pixel electrode 40 in contact with the drain electrode 70b of the TFT is formed on the gate insulating film 50. A protective film 80 covering the TFT and the pixel electrode 40 is formed, and an alignment film 83a of liquid crystal is formed on the protective film 80.

On the other hand, the black matrix 49 and the color filter 44 are formed on the upper plate 20, and the insulating film 51 is formed thereon. The common electrode 33 is formed on the insulating film 51, and the alignment layer 83b of the liquid crystal is formed on the common electrode 33.

When the structures are formed on the lower plate 10 and the upper plate 20 as described above, the substrates are bonded to each other by using a seal 18 or the like, the liquid crystals 88 are injected between the spaces of the bonded substrates, and then sealed. Display panels 1a and 1b are completed.

When the small liquid crystal display panels are bonded to each other on a plane, the structure of FIG. 2 is completed.

However, in the structure of the conventional large-area liquid crystal display panel described with reference to FIGS. 1 and 2, since the common electrode 33 is configured independently for each liquid crystal display panel, the image quality of each liquid crystal display panel is changed by the voltage difference of the common electrode 33. Difference occurs, and flicker occurs on the screen.

In addition, since the small liquid crystal display panels 1a and 1b are connected in a completely separated state, a driver driver for driving each liquid crystal display panel, that is, a gate driver driver 65 for applying a gate signal and a data driver for applying a data signal 75 is required for each liquid crystal display panel.

Accordingly, an object of the present invention is to improve the image quality of a screen by removing the flicker formed on the screen in a large area liquid crystal display panel formed by connecting small liquid crystal display panels.

Another object of the present invention is to provide a large-area liquid crystal display panel formed by connecting small liquid crystal display panels, and to reduce driving drivers by connecting gate bus lines or data bus lines to each other. This is to prevent deterioration of image quality due to signal timing delay.

The present invention attaches a small liquid crystal display panel in a structure in which common electrodes respectively formed on the small liquid crystal display panel are connected for the above purpose. The connection of the common electrodes may be easily performed by allowing the lower and upper plates of the small liquid crystal display panel to be bonded to each other in a displaced form.

A liquid crystal display panel in which the upper plate and the lower plate are bonded to each other while the metal film of the common electrode is formed up to the end of the upper plate is formed, and the small liquid crystal display panels are connected to each other so that the misaligned upper and lower plates are exactly matched. The common electrode is connected to each other by filling conductive resin such as ACF (Anisotropic Conductivity Film) or forming Ag dots in the space formed by the upper and lower plates of the joined portion.

In addition, the gate bus line or the data bus line is connected between the liquid crystal display panels in the same manner as described above. In other words, the gate bus line is described as an example, and the gate bus line is formed to the end of the lower plate, and a small liquid crystal display panel is formed by doping a conductive material such as silver (Ag) at the end of the gate bus line. The ends of the lower plates of the respective small liquid crystal display panels are bonded to each other. The dot connects the gate bus lines and the gate bus lines between the small liquid crystal display panels.

1 is a circuit diagram of a conventional large-area liquid crystal display panel formed by joining a small liquid crystal display panel.

2 is a cross-sectional view of a conventional large-area liquid crystal display panel formed by joining a small liquid crystal display panel.

3 and 4 are cross-sectional views of a large-area liquid crystal display panel of the present invention, in which a small liquid crystal display panel is connected to each other so that a common electrode is connected.

5 is a schematic diagram of a small liquid crystal display panel of the present invention showing a structure for connecting a gate bus line between the small liquid crystal display panels.

6 is a cross-sectional view of a large-area liquid crystal display panel of the present invention in which gate bus lines are connected between small liquid crystal display panels.

7 is a circuit diagram of a large-area liquid crystal display panel of the present invention in which gate bus lines are connected between small liquid crystal display panels.

* Explanation of symbols for main parts of the drawings

1a, 1b, 101a, 101b: small liquid crystal display panels 10, 110: lower plate

18, 118: seal 20, 120: top plate

30, 130: TFT 40, 140: pixel electrode

33, 133: common electrode 44, 144: color filter

49, 149: Black matrix 50, 150: Gate insulating film

51, 151: insulating film 60, 160: gate bus line

60a, 160a: gate electrodes 65, 165: gate driver

66, 166: gate pad 70, 170: data bus line

70a, 170a: source electrode 70b, 170b: drain electrode

75, 175: data driver 76, 176: data pad

83a, 83b, 183a, 183b: alignment layer 88, 188: liquid crystal

92a, 92b, 192a, 192b: ohmic contact layer 300: conductive resin (ACE)

310: silver (Ag) dot 320: insulating resin

In the large-area liquid crystal display panel of the present invention, the upper plate including the common electrode and the lower plate including the switching element are bonded to each other, and a plurality of small liquid crystal display panels are formed by injecting and sealing liquid crystals, followed by the plurality of small liquid crystal display panels. In particular, the common electrode is configured to be connected to each other between the attached small liquid crystal display panels.

More specifically, the structure of the upper and lower joints between the small liquid crystal display panels is shifted from each other, the upper electrode of the joint is formed at the end of the common electrode, and the upper and lower regions of the bonded region The common electrodes are connected to each other by ACF or Ag dots filled between the spaces of the lower plate. When the small liquid crystal display panel is connected to each other, the common electrode may be connected to each other by forming a structure in which an upper plate and a lower plate are attached to each other.

In addition, according to the present invention, a signal line (gate bus line or data bus line) formed for each small liquid crystal display panel may be connected between the small liquid crystal display panels connected by using a structure in which upper and lower plates are connected to each other in a displaced state. .

A structure in which gate bus lines are connected to each other between small liquid crystal display panels will be described as an example.

The upper and lower plates are bonded to each other so as to protrude one of the upper and lower plates, and the gate bus line extends to the end of the protruding substrate, and Ag is dot-patterned on the gate bus line on the protruding substrate. A plurality of small liquid crystal display panels having a plurality of the plurality of small liquid crystal display panels are connected to each other so that the protruding substrate portions face each other, and the gate bus lines between the small liquid crystal display panels are brought into contact with each other by the Ag dots. .

By configuring as described above, the purpose of the present invention is that the common electrode can be connected to improve the image quality of the screen and eliminate flicker.

In addition, it is possible to reduce the driving driver and to prevent deterioration in image quality due to signal timing delay.

The structure in which the common electrode is connected between the small liquid crystal display panel will be described in Embodiment 1, and the structure in which the gate bus line or data bus line is connected will be described in Embodiment 2.

Example 1

As shown in FIG. 3, in the small liquid crystal display panel 101a, the gate electrode 160a is formed on the lower plate 110, and the gate insulating layer 150 covering the gate electrode is formed. The semiconductor layer 190 is formed in an island shape on the gate insulating layer on the gate electrode, and ohmic contact layers 192a and 192b are formed at both ends of the surface of the semiconductor layer, respectively. The source electrode 170a is formed to be in contact with the ohmic contact layer 192a, and the drain electrode 170b is formed to be in contact with the ohmic contact layer 192b. By going through the above process, a TFT functioning as a switching element is formed on the lower plate 110. The pixel electrode 140 formed on the gate insulating layer 150 is in contact with the drain electrode 170b of the TFT. An insulating protective film 180 is formed to cover the pixel electrode and the TFT. An alignment film 183a is formed on the insulating protective film to align the liquid crystal.

Meanwhile, the black matrix 149 and the color filter 144 are formed on the upper plate 120. An insulating film 151 covering the black matrix and the color filter is formed. A common electrode 133 is formed on the bleeding film 151, and an alignment layer 183b is formed on the common electrode to align the liquid crystal.

In particular, the common electrode 133 of the upper plate 120 is configured to be exposed to a position separated by a predetermined distance from the end of the portion to be joined.

The upper plate 120 and the lower plate 110 formed as described above are bonded to each other via a seal 118 so that the structures face each other, and then injected and sealed the liquid crystal 188 into the space formed by the bonded upper and lower plates. The seal 118 is printed inside the upper and lower plates such that the upper plate 120 protrudes to expose the common electrode 133, and the lower plate 110 protrudes more than the upper plate.

That is, the upper and lower substrates are bonded to each other so that the common electrode 133 of the upper plate 120 is exposed.

The small liquid crystal display panel 101b connected to the small liquid crystal display panel 101a of FIG. 3 is configured through the same process as that of 101a, but the upper plate portion on which the exposed common electrode is positioned is protruded more than the lower plate for accurate and flat bonding. .

As described above, the upper and lower substrates are bonded to each other so that the upper and lower common electrodes are exposed, and the small liquid crystal display panels 101a and 101b are bonded to each other, and the conductive resin 300 such as ACF (Anisotropic Conductivity Film) is connected to the space of the substrate. Fill and cure.

Therefore, the common electrodes are connected to each other by the conductive cured resin, and the small liquid crystal display panels 101a and 101b are firmly bonded to each other.

Although the structure of FIG. 4 is the same as that of the structure of FIG. 3, the small liquid crystal display panels are formed and bonded to each other. However, when explaining the difference, the small liquid crystal display panel in which the upper and lower plates are bonded to each other to expose the common electrode 133 is the same structure. A plurality of upper and lower surfaces of the protruding upper surface, that is, the exposed common electrode 133 are connected to each other.

The structure has a structure in which the small liquid crystal display panels 101a and 101b are inverted and connected to each other. In the structure of FIG. 4, the conductive resin 300 is filled in the space of the bonded substrate as in the structure of FIG. 3 and cured so that the common electrodes 133 are connected to each other.

3 and 4, instead of the conductive resin 300, Ag dots or the like may be used to connect the common electrodes to each other.

Example 2

In the same manner as in the practical example 1, the gate bus line or the data bus line may be connected between the small liquid crystal display panel by using a structure in which the upper plate and the lower plate are bonded to each other in a displaced form.

As shown in FIG. 5, the small liquid crystal display panels 101a and 101b are bonded to each other such that the upper plate 120 and the lower plate 110 are shifted. The gate bus line 160 is extended to be formed on the lower plate 110 exposed after bonding, and a metal film 310 such as Ag is dotted at the end of the gate bus line of the small liquid crystal display panel 101a. When the small liquid crystal display panels 101a and 101b are connected to each other oppositely, the dotted metal film 310 of the small liquid crystal display panel 101a and the gate bus line 160 of the small liquid crystal display panel 101b are connected to each other.

Referring to Figure 6, it is easier to understand the structure.

The small liquid crystal display panels 101a and 101b are formed such that the upper plate 120 and the lower plate 110 are bonded to each other through the seal 118. In particular, the gate bus line 160 formed on the lower plate 110 extends to the end of the protruding lower plate. A dot 310 made of metal such as Ag is formed at an end portion of the gate bus line 160 of the small liquid crystal display panel 101a. The dot 310 and the gate bus line 160 of the small liquid crystal display panel 101b are connected to each other, and the small liquid crystal display panel is firmly connected to each other by filling the insulating resin film 320 in the space of the bonded substrate and curing the dots.

FIG. 7 illustrates a circuit diagram in which gate bus lines are connected between the small liquid crystal display panels.

In each of the small liquid crystal display panels 101a and 101b, the gate bus line 160 and the data bus line 170 are formed in a matrix. A TFT 130 electrically connected to the gate bus line and the data bus line is formed, and the pixel electrode 140 is in contact with one terminal of the TFT.

The data pad portion 176 connected to the data bus line and the gate pad portion 166 connected to the gate bus line are formed at the edge of the substrate. The data driver 175 is connected to the data pad 176 for each small liquid crystal display panel.

The gate driver 165 is connected to the gate pad 166 on either side of the small liquid crystal display panel because the gate bus line 160 is connected between the liquid crystal display panels (parts indicated by 500).

In the second embodiment, the gate bus line has been described as an example, but the present invention is not limited to the gate bus line and can be applied to the data bus line.

The large area liquid crystal display panel of the present invention is bonded to the upper and lower plates of the small liquid crystal display panel in a displaced form, and by connecting the small liquid crystal display panels bonded together as described above, the common electrode can be easily connected. To provide.

In addition, it is easy to provide a structure in which the gate bus line or the data bus line can be connected to each other between the small LCD panels connected to each other.

Accordingly, the large-area liquid crystal display panel of the present invention, which is formed by connecting a plurality of small liquid crystal display panels, has the effect of improving the image quality of the screen and removing flicker formed on the screen by connecting the common electrodes as one.

In addition, by connecting the gate bus line or the data bus line to each other between the small LCD panels connected to each other, driving drivers can be reduced, and image quality degradation due to signal timing delay between the LCD panels can be prevented.

Claims (8)

A large area liquid crystal display panel comprising a plurality of small liquid crystal display panels formed by joining an upper plate including a common electrode and a lower plate including a switching element, injecting and sealing liquid crystal, and connecting the plurality of small liquid crystal display panels. The large area liquid crystal display panel according to claim 1, wherein the common electrode is connected to each other between the attached small liquid crystal display panels. The large area liquid crystal display panel of claim 1, wherein the upper and lower plates of the attached small liquid crystal display panels are shifted from each other, and the common electrodes formed to the ends of the connecting portion are connected to each other by a conductive material. . The large area liquid crystal display panel of claim 2, wherein the conductive material is ACF or Ag. The large area liquid crystal display panel of claim 2, wherein an upper plate and a lower plate are connected to each other between the small liquid crystal display panels. The upper and lower substrates are bonded to each other so that one of the upper and lower substrates is interposed therebetween, and a signal line extends to an end portion of the protruding substrate, and a conductive material dot is formed on the signal lines on the protruding substrate. And a plurality of small liquid crystal display panels having a plurality of small liquid crystal display panels, and wherein the protruding substrate portions face each other by connecting the small liquid crystal display panels to each other, and the signal lines between the small liquid crystal display panels are brought into contact with each other by the dots. LCD panel. The large area liquid crystal display panel of claim 5, wherein the conductive material dot on the signal line is Ag. 6. The large area liquid crystal display panel of claim 5, wherein the signal line is a gate bus line. The large area liquid crystal display panel according to claim 5, wherein the signal line is a data bus line.

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