KR100688958B1 - Liquid Crystal Panel using for Liquid Crystal Display Device and method of manufacturing the same - Google Patents

Abstract

According to the present invention, there is provided a semiconductor device comprising: a first substrate having a plurality of gates and data wires orthogonal to each other; A second substrate on which a color filter is formed; A seal pattern positioned at an edge portion between the first and second substrates and having a liquid crystal injection hole formed at one side thereof; A photo resist (PR) column formed at a position close to the liquid crystal injection hole; A plurality of spacers dispersed between the first and second substrates; Provided is a liquid crystal panel for a liquid crystal display device comprising a liquid crystal filled in an area in which the seal pattern is formed. According to the liquid crystal panel for a liquid crystal display device having a PR pillar according to the present invention, a liquid crystal is injected by a liquid crystal into a spacer due to the penetration force By preventing the moving from the PR pillar, there is an effect that can prevent the aggregation of the spacer.

That is, by removing the alignment stains and cell gap defects caused by the aggregation of the spacer, it is possible to increase the production yield, and also to reduce the disposal cost for defective products at the same time.

Description

Liquid crystal panel using for liquid crystal display device and method of manufacturing the same             

1 is a flowchart showing step by step a manufacturing process of a liquid crystal cell for a general liquid crystal display device;

2 is a schematic plan view of a liquid crystal panel for a general liquid crystal display device;

3 is a schematic cross-sectional view taken along the line A-A of FIG. 2.

4 is a schematic plan view of a liquid crystal panel for a liquid crystal display according to the present invention.

5 is a schematic cross-sectional view taken along the line C-C of FIG. 4.

6 is a flowchart illustrating a method of manufacturing a liquid crystal panel for a liquid crystal display according to the present invention step by step.

<Description of Symbols for Main Parts of Drawings>

100: liquid crystal panel 110 for the liquid crystal display device: lower substrate

120: upper substrate 128: liquid crystal

136: gate wiring 137: gate insulating film

140: PR (Photo Resist) pillar 150: spacer                 

L: liquid crystal injection direction

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal panel for a liquid crystal display device and a manufacturing method thereof.

Recently, liquid crystal displays have been spotlighted as next generation advanced display devices with low added power, high portability, and technology-intensive products.

In general, the liquid crystal display device is a thin film that is a non-light emitting device that injects liquid crystal between an array substrate including a thin film transistor (TFT) and a color filter substrate and obtains an image effect by using the characteristics thereof. Transistor liquid crystal display device (hereinafter, abbreviated as liquid crystal display device).

The liquid crystal panel for the liquid crystal display device is largely manufactured through a two-step manufacturing process.

The first step is through the array process and the color filter process.

In this array process, an array substrate including a thin film transistor and a pixel electrode serving as one electrode for applying a voltage to the liquid crystal is formed.

In this color filter process, an R, G, B color filter that filters only light of a specific wavelength band, and a black matrix that blocks light on an area where the liquid crystal is not driven, the color classification of the R, G, and B color filters; A color filter substrate including a common electrode serving as the other electrode for applying a voltage to the liquid crystal is formed.

In this case, the array process and the color filter process are performed in units of cells to form one liquid crystal panel for a liquid crystal display device, and one or a plurality of cells are formed on the array substrate and the color filter substrate.

The second step is a liquid crystal cell manufacturing process using the array substrate and the color filter substrate, and the liquid crystal cell process may be characterized as having relatively few processes compared with the array process and the color filter process. The liquid crystal cell process can be roughly divided into an alignment film forming process, a cell gap forming process, a cell cutting process, and a liquid crystal injection process.

1 is a flowchart illustrating a manufacturing process of a liquid crystal cell for a general liquid crystal display step by step.

ST1 is a step of initially washing the upper substrate as the color filter substrate and the lower substrate as the array substrate, respectively.

This step is a process for removing foreign matter that may exist on the substrate before applying the alignment layer.

ST2 is a step of forming an alignment layer on the upper and lower substrates having undergone the ST1 step.

This step is to form an alignment film on the electrode portion in contact with the liquid crystal of the upper and lower substrates, respectively, which includes the application and curing of the alignment film, and a rubbing treatment process.                         

Polyimide resin is mainly used as the alignment film material because the polyimide resin has an advantage of showing a good alignment effect on most liquid crystal materials.

The rubbing treatment step is a step of rubbing the surface of the cured alignment film using a rubbing cloth in a predetermined direction to form a groove in a predetermined direction on the surface of the alignment film.

The alignment layer forming step is necessary to form a uniform alignment of the liquid crystal molecules to enable normal liquid crystal driving and to have a uniform display characteristic. In this step, the alignment layer is uniformly and uniformly applied to a large area. Most important.

ST3 is a step of forming a seal pattern and dispersing a spacer on the substrate that has undergone the ST2 step.

The seal pattern in the liquid crystal cell forms a gap for injecting the liquid crystal, and serves to prevent leakage of the injected liquid crystal.

This seal pattern is a process of forming a thermosetting resin mixed with glass fibers in a desired pattern constantly, and screen printing has become mainstream.

The seal pattern includes an opening for liquid crystal injection on one side for a later liquid crystal injection process, and is formed around a cell display area for each unit cell.

Next, as a step of dispersing a spacer, a spacer of a constant size is used to precisely and uniformly maintain a gap between the upper and lower substrates in the manufacturing process of the liquid crystal cell. Therefore, when the spacer is dispersed, it should be distributed at a uniform density on the substrate. The dispersion method can be largely divided into a wet dispersion method in which a spacer is mixed and sprayed with alcohol or the like and a dry dispersion method in which only the spacer is dispersed.

ST4 is a step of joining the upper and lower substrates passed through the ST3, the degree of alignment of the two substrates is determined by the margin given during the design of the two substrates, usually several micrometers (μm) precision Is required.

When the alignment between the two substrates is out of the margin given, light leaks out and does not have the desired characteristics when driven.

ST5 is a step of cutting the liquid crystal cell produced in the above steps ST1 to ST4 into unit cells.

In general, a liquid crystal cell undergoes a process of forming a plurality of cells on a large area glass substrate and then separating them into one cell, which is a cell cutting process.

The cell cutting process consists of a scribe process of forming a cutting line on the surface of a glass substrate with a diamond pen having a hardness higher than that of glass, and a break process of applying force to cut.

ST6 is a step of injecting and encapsulating the liquid crystal in units of cells after the cutting process.

The unit cell has a gap of several μm in an area of several hundred cm 2. As a method of effectively injecting a liquid crystal into a cell of such a structure, a vacuum injection method using a pressure difference inside and outside the cell is widely used.                         

Since the liquid crystal injection method using the pressure difference as described above requires the longest time in the liquid crystal cell process, it is important to set the optimum conditions in terms of productivity.

After the liquid crystal injection process is completed, the encapsulation process is a process of preventing the liquid crystal from flowing out of the injection hole of the liquid crystal cell after the liquid crystal injection is completed. Usually, after dispensing UV curable resin using a dispenser, the injection hole is blocked by irradiating ultraviolet rays.

At this time, when the external contact with the injection hole occurs in the state in which the liquid crystal is injected, defects due to contamination may occur, so care must be taken not to cause external contact during cell movement or process progress, and should not be left outside for a long time.

After the liquid crystal injection and encapsulation process, the liquid crystal cell undergoes subsequent processes such as an inspection process and a grinding process.

In the present specification, a description will be given of an existing liquid crystal panel for a liquid crystal display device and a liquid crystal panel for an improved structure to solve such a problem. do.

FIG. 2 is a schematic plan view of a liquid crystal panel for a general liquid crystal display device and relates to a liquid crystal panel in which a sealing process is completed after liquid crystal injection.

As shown in the drawing, a liquid crystal panel 10 for a general liquid crystal display device includes an upper substrate 12 as a color filter substrate and a lower substrate 14 as an array substrate, having a predetermined cell gap therebetween, and upper and lower substrates. The upper and lower substrates 12 and 12 are located at an edge portion between the 12 and 14 and have a seal pattern 18 having a liquid crystal injection hole 16 on one side thereof and a liquid crystal injection hole 16 of the seal pattern 18. And a sealing seal 22 for blocking the liquid crystal injection hole 16 from the outside after the liquid crystal injection.

The enlarged view of the original view shows a partial region of the lower substrate 14 proximate to the liquid crystal injection hole 16, and particularly, to show the scattering state of the spacer on the lower substrate after the liquid crystal injection.

As shown in the drawing, a gate wiring 24 formed in a horizontal direction on the lower substrate 12 and a data wiring 26 orthogonal to the gate wiring 24 are formed. The gate wiring and the data wiring 24 are formed. , The pixel electrode 28 is formed in an area where 26 crosses each other, and the thin film transistor T is connected to the pixel electrode 28.

The spacer 30 is dispersed on the lower substrate 12.

As described above with reference to ST3 of FIG. 1, the spacers 30 are uniformly distributed on the entire surface of the substrate during initial spreading, but as shown in FIG.

In this way, the liquid crystal injection is mainly driven by a vacuum injection method in which the spacer 30 is displaced to a partial region out of the original scattered position during the liquid crystal injection process. The vacuum injection method is used to generate a capillary phenomenon and a pressure difference in a minute cell gap of a panel. Since the liquid crystal is injected by using the liquid crystal panel, the panel is repeatedly contracted and expanded in the course of the process, thereby making it difficult to fix the spacer 30. As a result, the penetrating force of the liquid crystal in the liquid crystal injection process is equal to the cell gap of the panel. Since the spacer 30 has the largest diameter, the spacer 30 tends to be driven to one place according to the penetration force of the liquid crystal.

That is, due to the above-mentioned cause, agglomeration of the spacer 30 occurs, and the agglomeration of the spacer 30 is particularly severe along the gate line 24 adjacent to the liquid crystal injection hole 16.

This is because the liquid crystal injection direction indicated by the arrow and the gate wiring 24 are parallel to each other, so that the spacer 30 is easily displaced to the stepped portion of the gate wiring 24 due to the influence of the liquid crystal penetration force during the liquid crystal injection. to be.

FIG. 3 is a schematic cross-sectional view taken along the cutting line AA of FIG. 2. As shown in the drawing, in the general liquid crystal panel, the upper and lower substrates 12 and 14 are opposed to each other by a predetermined distance, and the upper and lower substrates ( The liquid crystal 20 is filled between the 12 and 14, and R, G, and B color filters 32 and a black matrix 34 are formed below the upper substrate 12, and the lower substrate 14 is formed. The gate wiring 24 is formed in the position corresponding to this black matrix 34 on it, The gate insulating film 25 is formed in the whole surface of the board above this gate wiring 24, The gate insulating film 25 The pixel electrode 28 is formed at a position corresponding to the R, G, and B color filters 32 above.

In addition, the arrow displayed on the liquid crystal 20 layer indicates the direction in which the liquid crystal 20 is injected, since the penetration force of the liquid crystal 20 is most received by the spacer (30 in FIG. 2) when the liquid crystal is injected in the arrow direction. Agglomeration of the spacers may be caused when the spacers (30 of FIG. 2) are separated from the original position and collected in some regions.

Such agglomeration of spacers may damage the rubbing treatment of the alignment layers (not shown) formed on the inner surfaces of the upper and lower substrates 12 and 14 to cause alignment stains, and may also cause non-uniform cell gaps.

In order to solve the above problems, the present invention considers that agglomeration of spacers occurs most severely along the wiring in a direction parallel to the liquid crystal injection direction, so as to change the structure of the lower substrate adjacent to the liquid crystal injection hole. An object of the present invention is to provide a liquid crystal panel for a liquid crystal display device having improved yield by preventing aggregation.

In order to achieve the above object, the present invention includes a first substrate formed with a plurality of gates and data wires orthogonal to each other; A second substrate on which a color filter is formed; A seal pattern positioned on an edge portion between the first and second substrates and having a liquid crystal injection hole at one side thereof; A plurality of photo resist (PR) pillars formed inwardly of the seal pattern; A plurality of spacers dispersed between the first and second substrates; The liquid crystal panel may include a liquid crystal filled inside the region where the seal pattern is formed, and the plurality of RR pillars may prevent movement of the plurality of spacers due to liquid crystal penetration force when the liquid crystal is injected. .

The height of the plurality of PR pillars is 1/2 of a distance between the first and second substrates, and the plurality of PR pillars are formed to be perpendicular to one side having a liquid crystal injection hole of the seal pattern among the plurality of gates and data wires. It is characterized in that formed on the wiring, the plurality of PR air is characterized in that it is made through a photolithography process using a transflective mask or a mask for diffraction exposure.

In still another aspect of the present invention, a plurality of gate wirings and data wirings orthogonal to each other are formed, the first substrate including a plurality of PR pillars formed on upper ends of the plurality of gate wirings and data wirings; Preparing a second substrate including a color filter; Forming a seal pattern such that a liquid crystal injection hole is positioned at an edge portion closest to the plurality of PR pillars on any one of the first and second substrates; Distributing a spacer on any one of the first and second substrates; Bonding the first and second substrates to face each other; It provides a method for manufacturing a liquid crystal panel for a liquid crystal display device comprising the step of injecting a liquid crystal between the bonded first and second substrates.

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Forming the plurality of PR pillars on the first substrate includes a photolithography process using a semi-transmissive mask or a mask for diffraction exposure.

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

4 is a schematic plan view of a liquid crystal panel for a liquid crystal display according to the present invention.

The liquid crystal panel for a liquid crystal display device according to the present invention may be applied to the liquid crystal cell manufacturing process of FIG. 1, and relates to a liquid crystal panel in which a sealing process is completed after liquid crystal injection.

As shown, the liquid crystal panel 100 for a liquid crystal display according to the present invention includes a plurality of gates for connecting a plurality of gate wires 136 and data wires (not shown) to external circuits on both neighboring outer sides; The lower substrate 110 on which the data pads 102 and 104 are formed, the gate and the data pads 102 and 104 of the lower substrate 110 are exposed, and the color filter substrate disposed on the lower substrate 110. The upper substrate 120 and the seal pattern 122 having a liquid crystal injection hole 124 on the edge portion between the upper and lower substrates 120 and 110, and the upper and lower substrates 120, And a sealing seal 126 for blocking the liquid crystal injection hole 124 from the outside after the liquid crystal injection.

An enlarged view of the original view is a cross-sectional view taken along the cutting line BB of FIG. 4, and as shown, the upper and lower substrates 120 and 110 are opposed to each other by a predetermined interval, and the upper and lower substrates 120 and 110 are opposite to each other. The liquid crystal 128 is filled between the upper and lower sides of the upper substrate 120, and the R, G and B color filters 132 for filtering only light of a specific wavelength band and the R, G and B color filters 132. Located at the bottom of the, overlaps the R, G, B color filter 132 by a predetermined interval, the area of the color classification and the liquid crystal 128 of the R, G, B color filter 132 is not driven The black matrix 134 is formed to block the light of the image.

The gate line 136 is formed on the lower substrate 110 to face the black matrix 134, and a gate insulating layer 137 is formed on the entire surface of the substrate 110 on the gate line 136. The pixel electrode 138 is formed on the gate insulating layer 137 at a position opposite to the R, G, and B color filters 132, and at a position facing the black matrix 134. (Photo Resist) The pillar 140 is formed.

The PR pillar 140 is formed by leaving a PR (Photo Resist) used in the photolithography process on the gate wiring 136 adjacent to the liquid crystal injection hole during a photolithography process for forming an array element. do.                     

The PR pillar 140 may be formed using a semi-transmissive mask that can adjust the thickness of the PR for each position or a mask using diffraction of light.

In addition, the PR pillar 140 is preferably formed at a height of about 1/2 of the panel cell gap without preventing the liquid crystal injection and preventing movement due to the liquid crystal injection of the spacer (not shown).

However, the present invention is not limited to the step of forming the PR pillar, and may be applied to other methods without departing from the spirit of the present invention.

FIG. 5 is a schematic diagram illustrating a cross section taken along the cutting line C-C of FIG. 4.

As shown, the cross-section of the liquid crystal injection hole in the same direction as the liquid crystal injection of the liquid crystal panel for a liquid crystal display device according to the present invention, when the liquid crystal 128 is injected in the direction of the arrow, the gate wiring 136 of the lower substrate 110 By removing the influence of the penetrating force of the liquid crystal 128 directly on the spacer 150 by the formation of the PR pillar 140 formed on the), it is possible to prevent the movement of the spacer 150.

As described with reference to FIG. 2, when the stacking phenomenon of the spacers is intensified along both steps of the substrates arranged in a direction parallel to the liquid crystal injection direction L, the gate wiring 136 close to the liquid crystal injection hole is thus. By mounting the PR pillar 140 on the spacer 150 located in the direction parallel to the gate wiring 136 is less affected by the penetrating force of the liquid crystal 128, in particular, the aggregation of the spacer 150 It can effectively prevent.                     

However, in the liquid crystal panel for a liquid crystal display device according to the present invention, the position at which the PR pillars 140 are formed is not limited to the gate wiring 136, and changes to other positions may be made without departing from the spirit of the present invention. Do.

For example, if the liquid crystal injection direction is a liquid crystal panel having a direction parallel to the data wiring, it is effective to form this PR column on the data wiring.

6 is a flowchart illustrating a method of manufacturing a liquid crystal panel for a liquid crystal display device according to an embodiment of the present invention. The array process, the color filter process, and the liquid crystal cell manufacturing process of the liquid crystal panel will be described in order.

As shown, ST11 is a step of preparing a lower substrate which is an array substrate including an upper substrate and a PR pillar that is a color filter substrate.

One or a plurality of cells including a color filter and a black matrix are formed on the upper substrate, and one or a plurality of cells including the gate wiring and the data wiring are formed on the lower substrate.

The PR pillar is formed in the outer portion of the wiring formed in the same direction as the liquid crystal injection direction.

The PR pillar may be formed using a transflective mask or a mask for diffraction exposure in the photolithography process as described above with reference to FIG. 4.

ST12 is a step of forming a seal pattern on the one of the upper substrate and the lower substrate so that the liquid crystal injection hole is located in the position close to the PR pillar.

At this time, since the position of the liquid crystal injection hole is generally constant for each substrate size, it is preferable to form a PR pillar on the wiring close to the position of the liquid crystal injection hole to be formed later, when the PR pillar of the lower substrate is formed.

ST13 is a step of dispersing the spacer on any one of the upper and lower substrates.

The spacer spreading method may use the spacer spreading method described above with reference to FIG. 1.

ST14 is a process of joining the upper and lower substrates and then cutting them in cell units.

Prior to this process, the coating and rubbing treatment of the alignment film is included on the inner surfaces of the upper and lower substrates facing each other.

In ST15, the liquid crystal is injected into the unit cell and the injection hole is sealed.

This liquid crystal injection process is carried out using a vacuum injection method using a capillary phenomenon and a pressure difference. In the PR pillar formed near the liquid crystal injection hole during liquid crystal injection, the liquid crystal penetration force is primarily used to protect the spacer by the liquid crystal penetration force. Can be prevented from being moved to eliminate the agglomeration of the spacers.

After the liquid crystal injection step is completed, the liquid crystal injection port is sealed to finish the liquid crystal cell process.

As described above, according to the liquid crystal panel for a liquid crystal display device having a PR pillar according to the present invention, by preventing the movement of the spacer by the penetration of the liquid crystal at the PR pillar, the aggregation phenomenon of the spacer can be prevented. Has                     

That is, by removing the alignment stains and cell gap defects caused by the aggregation of the spacer, it is possible to increase the production yield, and also to reduce the disposal cost for defective products at the same time.

Claims (6)

A first substrate having a plurality of gates and data wires orthogonal to each other; A second substrate on which a color filter is formed; A seal pattern positioned on an edge portion between the first and second substrates and having a liquid crystal injection hole at one side thereof; A plurality of photo resist (PR) pillars formed inwardly of the seal pattern; A plurality of spacers dispersed between the first and second substrates; Liquid crystal filled inside the region where the seal pattern is formed And the plurality of RR pillars prevent movement of the plurality of spacers due to liquid crystal penetration force during liquid crystal injection. The method of claim 1, The height of the plurality of PR pillars is a liquid crystal panel for a liquid crystal display device is 1/2 of the interval between the first and second substrates. The method of claim 1, And the plurality of PR pillars are formed on a plurality of wires formed perpendicular to one side of the plurality of gates and data wires having a liquid crystal injection hole of the seal pattern. The method of claim 1, The plurality of PR air is a liquid crystal panel for a liquid crystal display device made through a photolithography process using a transflective mask or a mask for diffraction exposure. A plurality of gate wirings and data wirings orthogonal to each other are formed, the first substrate including a plurality of PR pillars formed on upper ends of the plurality of gate wirings and data wirings, and a second substrate including a color filter. Preparing; Forming a seal pattern such that a liquid crystal injection hole is positioned at an edge portion closest to the plurality of PR pillars on any one of the first and second substrates; Distributing a spacer on any one of the first and second substrates; Bonding the first and second substrates to face each other; Injecting liquid crystal between the bonded first and second substrates Method of manufacturing a liquid crystal panel for a liquid crystal display device comprising a. The method of claim 5, wherein The forming of the plurality of PR pillars on the first substrate may include a photolithography process using a semi-transmissive mask or a mask for diffraction exposure.

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