KR20010015429A - Liquid crystal display panel with uniform cell gap and method of manufacturing the same - Google Patents

Abstract

PURPOSE: To provide a liquid crystal display panel which has no warpage of a substrate or display irregularity due to an irregular gap and which is suitable for a large size liquid crystal display panel. CONSTITUTION: In the liquid crystal display panel having a liquid crystal 5 sealed between a TFT(thin film transistor) substrate 2 and a color filter substrate 3 and having a polarizing plate 8 laminated, a stress relieving layer 10 consisting of one of polyester, polyethylene, methylpolymethacrylate and polycarbonate is formed so that the stress relieving layer 10 relieves the stress added on the liquid crystal display panel.

Description

Liquid crystal display panel having a uniform cell spacing and a method of manufacturing the same {LIQUID CRYSTAL DISPLAY PANEL WITH UNIFORM CELL GAP AND METHOD OF MANUFACTURING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a liquid crystal display panel and a method for manufacturing the same, and more particularly, to prevent warpage of a substrate of a liquid crystal display panel and to uniform cell spacing to effectively prevent display unevenness or irregularity of a liquid crystal display.

Liquid crystal display panels, such as color liquid crystal display panels, often include a pair of polarizers or polarizing films each having a pair of triacetyl cellulose (TAC) films or layers and a polyvinyl alcohol (PVA) film or layers between the TAC films. Equipped. The liquid crystal display panel is manufactured by bonding the color filter substrate and the TFT substrate through the cell gap and by filling the liquid crystal material at the cell gap. The polarizing film is attached onto the color filter substrate and the TFT substrate through the adhesive layer. After the attachment of the polarizing film, the assembled liquid crystal display panel is aged at high temperature. In this aging process, under such high temperature conditions, the base material layer of the polarizing film, in particular the TAC film, contracts, whereby stress is applied to the liquid crystal display panel, in particular to the substrate. There is a probability that the substrate of the liquid crystal display panel is bent due to the stress caused by the contraction of the TAC layer. In a liquid crystal display panel, if the substrate is bent, the cell spacing varies with the position of the panel, causing display nonuniformity.

A technique for preventing such warpage in a liquid crystal display panel is proposed in Japanese Patent Laid-Open No. 9-33723. In the technique disclosed in the above patent publication, the pressure-sensitive adhesive layer has been improved to prevent such warping of the substrate of the liquid crystal display panel.

However, in recent years, the size of liquid crystal display panels has become considerably larger. As the liquid crystal display panel becomes larger, the substrate of the liquid crystal display panel tends to bend. In the above-described prior art, it is impossible to properly prevent warpage in the substrate of the large liquid crystal display panel. Therefore, it is desired to properly prevent warpage in the substrate of the large liquid crystal display panel.

Therefore, an object of the present invention is to eliminate the disadvantages of the conventional liquid crystal display panel.

Another object of the present invention is to provide a liquid crystal display panel and a method of manufacturing the liquid crystal display panel which can be effectively prevented from warping in the substrate of the liquid crystal display panel.

It is still another object of the present invention to provide a liquid crystal display panel and a method of manufacturing the same, which can alleviate stress applied on a substrate and can effectively prevent bending of the liquid crystal display panel in the substrate.

It is still another object of the present invention to provide a liquid crystal display panel and a method of manufacturing the liquid crystal display panel, the cell spacing of which can be uniform.

Another object of the present invention is to provide a liquid crystal display panel and a method of manufacturing the same, wherein cell gaps of the liquid crystal display panel can be uniform, and display irregularities or irregularities can be effectively prevented.

Another object of the present invention is to provide a liquid crystal display panel and a method of manufacturing the same, in which the warpage of the substrate can be effectively prevented even in a large liquid crystal display panel.

Another object of the present invention is to provide a liquid crystal display panel and a method of manufacturing the same, wherein the cell spacing of the liquid crystal display panel can be uniform, and display irregularities or irregularities can be effectively prevented even in a large liquid crystal display panel.

1 is a cross-sectional view illustrating a liquid crystal display panel according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a color liquid crystal display module in which the liquid crystal display panel and the chassis of FIG. 1 are assembled.

3 is a flowchart illustrating a manufacturing process of the liquid crystal display panel of FIG. 1;

4 is a cross-sectional view illustrating the liquid crystal display panel of FIG. 1 after aging is performed.

5 is a cross-sectional view illustrating a liquid crystal display panel according to a second embodiment of the present invention.

6 is a flowchart illustrating a manufacturing process of the liquid crystal display panel of FIG. 5;

7 is a cross-sectional view showing a conventional liquid crystal display panel.

Explanation of symbols on the main parts of the drawings

1: color liquid crystal substrate assembly 2: TFT substrate

3: color filter substrate 4: sealing material

6A, 6B: TAC layer 7: PVA layer

9A, 9B: adhesive layer 10: stress relaxation layer

11A and 11B: stress relaxation polarizing film 12: color liquid crystal display panel

According to an aspect of the present invention, there is provided a TFT substrate, a color filter substrate, a liquid crystal material for filling a space between the TFT substrate and the color filter substrate, a first polarizing film located outside the color filter substrate, and the TFT. A second polarizing film positioned outside of the substrate, and at least one stress made of one or more materials selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate, to prevent bending of the color filter substrate or the TFT substrate A liquid crystal display panel having a stress relieving layer is provided.

In this case, it is preferable that the stress relaxation layer prevents warping in the color filter substrate or the TFT substrate caused by shrinking the stress of the first polarizing film or the second polarizing film.

It is also preferred that at least one stress relaxation layer is positioned in contact with the first and / or second polarizing film.

It is also preferred that at least one stress relaxation layer is located between the first polarizing film and the color filter substrate and / or between the second polarizing film and the TFT substrate.

At least one stress relieving layer is located on the side of the face of the first polarizing film opposite the face facing the color filter substrate and / or on the side of the face of the second polarizing film opposite the face facing the TFT substrate. It is advantageous.

It is also advantageous for each of the first and second polarizing films to have a polyvinyl alcohol (PVA) layer and a pair of triacetyl cellulose (TAC) layers attached to both sides of the PVA layer.

It is also advantageous for the stress relaxation layer to be attached on one of the TAC layers of the first polarizing film and on one of the TAC layers of the second polarizing film, respectively, via an adhesive layer.

The stress relief layer is preferably composed of a single layer made of a material selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate.

In addition, it is preferable that the stress relaxation layer has a multilayer structure having a plurality of layers each made of a material selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate.

According to another aspect of the invention, at least one first triacetyl cellulose (TAC) layer, a polyvinyl alcohol (PVA) layer on the first TAC layer, a second TAC layer on the PVA layer, polyester, polyethylene Preparing first and second stress relaxation polarizing films each having a stress relaxation layer on the second TAC layer, made of at least one material selected from the group consisting of polymethyl methacryl and polycarbonate, and a color filter substrate; And manufacturing a color liquid crystal substrate assembly comprising a TFT substrate and a liquid crystal material filling a space between the color filter substrate and the TFT substrate, wherein the first and second stress relaxation polarizing films are formed into the color filter substrate and the TFT substrate, respectively. It is provided with the manufacturing method of the liquid crystal display panel characterized by the step of attaching on.

In this case, the stress relaxation layer of the first stress relaxation polarizing film prevents warping in the color filter substrate caused by shrinking the stress of the first or second TAC layer of the first stress relaxation polarizing film, and the stress of the second stress relaxation polarizing film It is preferable that the relaxation layer prevents warping in the TFT substrate caused by shrinking the stress of the first or second TAC layer of the second stress relaxation polarizing film.

In addition, the manufacturing steps of the first and second stress relaxation polarizing film, the step of attaching each of the first TAC layer and the second TAC layer on both sides of the PVA layer, and applying an adhesive layer on the second TAC layer And, applying the stress mitigating layer on the adhesive layer on the second TAC layer.

In addition, the first and second stress relaxation polarizing film further comprises applying an adhesive layer on the stress relaxation layer, in the step of attaching the first and second stress relaxation polarizing film on the color filter substrate and the TFT substrate And a first stress relaxation polarizing film is attached onto the color filter substrate on the stress relaxation layer of the first stress relaxation polarizing film through the adhesive layer, and the second stress relaxation polarizing film is formed on the stress relaxation layer of the second stress relaxation polarizing film. It is preferable to adhere on the TFT substrate through.

The first and second stress relaxation polarizing films further comprise applying an adhesive layer on the first TAC layer, wherein attaching the first and second stress relaxing polarizing films on the color filter substrate and the TFT substrate. A first stress relaxation polarizing film is attached on the color filter substrate via an adhesive layer on the first TAC layer of the first stress relaxing polarizing film, and the second stress relaxing polarizing film is on the first TAC layer of the second stress relaxing polarizing film. It is advantageous to attach on the TFT substrate through.

It is also advantageous that the stress relaxation layer is composed of a single layer made of a material selected from the group consisting of polyesters, polyethylenes, polymethyl methacryl and polycarbonates.

In addition, the stress relaxation layer is prepared by alternately extending the plurality of layers in two different directions, and then stacking the plurality of layers each made of a material selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate. It is advantageous to have a multi-layered structure.

Preferably, the preparation of the first and second stress relaxation polarizing films comprises the steps of extending the PVA film and impregnating the PVA film in an iodine solution, attaching the first TAC film and the second TAC film on both sides of the PVA film; Applying a first adhesive layer on the second TAC film, attaching a separator on the first adhesive layer, and attaching a protective film on the first TAC film, a protective film, the first TAC film, Cutting the laminated body including the PVA film, the second TAC film, the first adhesive layer, and the separator into a predetermined size; peeling off the separator from the first adhesive layer to form the stress relaxation layer in the first Attaching on the pressure-sensitive adhesive layer, and applying a second pressure-sensitive adhesive layer on the stress relaxation layer, and attaching the first and second stress relaxation polarizing films on the color filter substrate and the TFT substrate. The first stress relaxation polarizing film is attached onto the color filter substrate through the second adhesive layer of the first stress relaxing polarizing film, and the second stress relaxing polarizing film is the second adhesion of the second stress relaxing polarizing film. And is deposited on the TFT substrate through a layer.

Also preferably, the preparation of the first and second stress relaxation polarizing films comprises the steps of extending the PVA film and impregnating the PVA film in an iodine solution, and attaching the first TAC film and the second TAC film on both sides of the PVA film. And applying a first adhesive layer and a second adhesive layer on the first TAC film and the second TAC film, respectively, and applying a first separator and a second separator on the first adhesive layer and the second adhesive layer. Attaching to the substrate, and the laminated body including the first separator, the first adhesive layer, the first TAC membrane, the PVA membrane, the second TAC membrane, the second adhesive layer, and the second separator. Cutting to a predetermined size, peeling off the second separator from the second adhesive layer to attach the stress relaxation layer on the second adhesive layer, and attaching a protective film on the stress relaxation layer. And the separation After peeling off, in the step of attaching the first and second stress relaxation polarizing film on the color filter substrate and the TFT substrate, the first stress relaxation polarizing film to the first pressure-sensitive adhesive layer of the first stress relaxation polarizing film And a second stress relaxation polarizing film is attached onto the TFT substrate through the first adhesive layer of the second stress relaxation polarizing film.

The above and other features and other advantages of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings, wherein like reference numerals designate the same or corresponding parts throughout the figures thereof.

Referring to the drawings, a liquid crystal display panel and a method of manufacturing the liquid crystal display panel according to various embodiments of the present invention will be described.

Example 1

1 is a schematic cross-sectional view of a liquid crystal display panel according to a first exemplary embodiment of the present invention.

As shown in FIG. 1, the color liquid crystal display panel 12 according to the first embodiment includes a color liquid crystal substrate assembly 1 and a stress relaxation polarizing film 11A attached on both surfaces of the color liquid crystal substrate assembly 1. 11B). The color liquid crystal substrate assembly 1 includes a TFT substrate 2 having thin film transistors (TFTs) formed on a glass substrate (not shown), and a color filter substrate 3 having a color filter formed on a glass substrate (not shown). It is provided. An alignment layer is formed on each inner surface of the TFT substrate 2 and the color filter substrate 3, where the alignment process is performed. The TFT substrate 2 and the color filter substrate 3 face each other and are jointed through a sealing material 4 made of epoxy resin or the like treated by heat treatment or the like. A spacer 19 and a transfer (not shown) are located between the TFT substrate 2 and the color filter substrate 3. In addition, the liquid crystal material 5 is injected into the space between the TFT substrate 2 and the color filter substrate 3.

The stress relaxation polarizing films 11A and 11B are attached on the TFT substrate 2 and the CF substrate 3 of the color liquid crystal display assembly 1, respectively. The stress relaxation polarizing films 11A and 11B have the same structure. Each of the stress-relieving polarizing films 11A and 11B has a pressure-sensitive adhesive layer 9A, a stress-releasing layer 10, another pressure-sensitive adhesive layer 9B, and a TAC layer 6A from the side of the TFT substrate 2 or the CF substrate 3. , A PVA layer 7 as a polarizer, another TAC layer 6B, and a protective film 30.

Here, the stress relaxation layer 10 is preferably made of a material having high strength and high transmittance of visible light. In addition, the stress relaxation layer 10 is preferably made of a material that is stable in the temperature range of about -20 degrees Celsius to 60 degrees Celsius. In addition, the stress relaxation layer 10 is preferably made of a material that does not pass ultraviolet light. Therefore, the stress relief layer 10 may be made of a material comprising at least one material selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate.

In this embodiment, the stress relief layer 10 is made of a single layer of polyester. However, the stress relief layer 10 may be a single layer made of any of polyethylene, polymethyl methacryl and polycarbonate. In addition, the stress relaxation layer 10 may be formed as a multilayer structure having a plurality of layers made of one or more materials selected from the group consisting of polyester, polyethylene, polymethyl methacryl, and polycarbonate. In this case, each layer is preferably laminated so as to alternately extend in different directions to produce the stress relaxation layer 10. This structure effectively assists in preventing thermal contraction of the stress relaxation layer 10 to prevent thermal contraction of the polarizing film, in particular the TAC layer. When the stress relief layer 10 is made as a multilayer structure, the materials of each layer may be the same or may be different.

FIG. 2 shows a schematic cross-sectional view of the color liquid crystal module 31 with various components attached to the color liquid crystal display panel 12 shown in FIG. 1. In the color liquid crystal module 31 of FIG. 2, tape carrier packages (TCPs) 21 are attached and connected to the terminals 26 of the TFT substrate 2. Although not shown in the figure, the pads or terminals of the TCPs 21 are also connected to the terminals or pads of the printed circuit board 22. The back light unit 23 is attached on the back of the color liquid crystal display panel 12, and the entire assembly is included in the chassis 24 having the signal substrate.

Now, a manufacturing process of the liquid crystal display panel according to the first embodiment of the present invention will be described.

3 is a flowchart illustrating a manufacturing process of a liquid crystal display panel according to a first embodiment of the present invention.

In order to produce the PVA film 7, a PVA sheet having a thickness of 50 μm is wound with a roll. In step S1, the PVA sheet from the roll is extended to impregnate the solution containing iodine or dye so that the PVA sheet is directional. In step S2, the extended PVA sheet is impregnated with a solution containing iodine or dye, whereby the iodine or dye is permeated into the PVA sheet along the extending direction.

In order to improve the mechanical strength and waterproofing, in step S3, each of the thicknesses is 80 mu m and a TAC film for producing the TAC layers 6A and 6B is attached on both sides of the PVA sheet, while extending both the TAC films. In step S4, an adhesive material corresponding to the adhesive layer 9B, for example, an acrylic resin or the like, is applied on one side of the TAC film corresponding to the TAC layer 6A. Then, in step S5, the separator is attached on the adhesive layer 9B, and the protective film 30 is attached on the surface of the other TAC layer 6B. In step S6, the laminated body made of the protective film 30, the TAC layer 6B, the PVA layer 7, the TAC layer 6A, the adhesive layer 9B, and the separator is formed by, for example, a Thomson cutter or the like. It is cut to a size corresponding to the size of the color liquid crystal substrate assembly 1. Thereafter, the separator on the adhesive layer 9B is peeled off, and a stress relaxation layer 10 made of polyester or the like and having a thickness of about 200 μm is attached on the adhesive layer 9B in step S7. The stress relief layer 10 may, for example, be made of a single layer of polyester. However, in order to prevent heat shrinkage, the layers or membranes are alternately extended in different directions and then laminated with a plurality of layers or membranes made of a material selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate. Stress relief layer 10 may also be manufactured. In step S8, the adhesion layer 9A is applied on the surface of the stress relaxation layer 10, and the separator is again attached on the adhesion layer 9A. In this way, the stress relaxation layers 11A and 11B are completed.

Next, in step S9 for manufacturing the color liquid crystal substrate assembly, an alignment process is performed on each of the color filter substrate 3 and the TFT substrate 2 already prepared. The sealing material 4 is then applied to one of the color filter substrate 3 and the TFT substrate 2. Further, on the other one of the color filter substrate 3 and the TFT substrate 2, a transfer material for electric conduction is applied and the material for the spacer 19 is sprayed. Thereafter, the color filter substrate 3 and the TFT substrate 2 face each other so that both surfaces are aligned, and the sealing material 4 is treated with heat. Thereafter, the liquid crystal material 5 is injected into the space between the color filter substrate 3 and the TFT substrate 2 via a charging port not shown in the drawing, which is then closed or sealed. Thus, the color liquid crystal substrate assembly 1 is completed. In step S10, on both sides of the color liquid crystal substrate assembly 1, that is, on the outer surface of the color filter substrate 3 and the TFT substrate 2, the stress-relieving polarizing films 11A and 11B, each of which the separator is peeled off, are respectively It adheres by using 9A of adhesion layers. Then, by the process using an autoclave, between the stress relaxed polarizing film 11A and the color liquid crystal substrate assembly 1 and between the stress relaxed polarizing film 11B and the color liquid crystal substrate assembly 1. Bubbles or cavities are removed.

In step S11, the color liquid crystal display module 31 is manufactured. That is, the TCP 21 is connected to the TFT substrate 2 such that the conductive terminal of the TCP 21 is connected with the terminal 26 of the TFT substrate 2 using compression bonding or pressure welding. In addition, the protective film 30 is peeled off, and the chassis 24 having the printed circuit board 22, the back light unit 23 and the signal circuit board is assembled together with the color liquid crystal substrate assembly 1. Thus, the color liquid crystal display module 31 is completed. In step S12, the color liquid crystal module assembled in this manner is aged at a thermostat of about 50 degrees Celsius. Then, in step S13, the color liquid crystal display module 31 is inspected by the inspection apparatus.

Next, with reference to the drawings, the nonuniformity or irregularity of the cell spacing caused when the color liquid crystal display module is aged will be described.

7 illustrates a cross-sectional view of a conventional liquid crystal display panel after performing aging of the color liquid crystal display module.

In the conventional liquid crystal display panel 212 illustrated in FIG. 7, the liquid crystal display panel of FIG. 7 substantially does not have the stress relaxation layer 10 and the adhesive layer 9B in order to attach the stress relaxation layer 10. Except for the point, it has the same structure as that of the color liquid crystal display panel 12 according to the present invention shown in FIG. That is, the polarizing films 211A and 211B are attached on both surfaces of the color liquid crystal substrate assembly 201, that is, on the surfaces of the color filter substrate 203 and the TFT substrate 202 through the adhesive layer 209A. Each of the polarizing films 211A and 211B is manufactured by stacking the TAC layer 206B, the PVA layer 207 and the TAC layer 206A. In addition, the color liquid crystal substrate assembly 201 has a structure substantially the same as that of the color liquid crystal substrate assembly 1 shown in FIG. The spacer 219 is positioned between the color filter substrate 203 and the TFT substrate 202 bonded to each other through the sealing material 204, and the liquid crystal material 205 is injected.

In the conventional liquid crystal display panel 212, the TAC layers 206A and 206B extend when attached to the PVA layer 207. However, during the aging process of the liquid crystal display module, due to the heat applied to the panel, the PCA layer and the adhesive layer, in particular the TAC layers 206A, 206B easily shrink in the extending direction. In addition, moisture absorbed from the PVA layer 207 into the TAC layers 206A, 206B is dissipated from the TAC layers 206A, 206B, thereby causing shrinkage of the TAC layers 206A, 206B.

As a result, in the conventional color liquid crystal display panel 212, the polarizing films 211A and 211B are completely contracted so that each of the color filter substrate 203 and the TFT substrate 202 is pulled toward the center thereof, so that the color filter Warping occurs in each of the substrate 203 and the TFT substrate 202. Therefore, as shown in FIG. 7, the color liquid crystal substrate assembly 201 is deformed into a concave lens shape, and each of the cell gaps 241B and 241C at the outer circumferential portion of the color liquid crystal substrate assembly 201 is a color liquid crystal substrate assembly ( It becomes larger than the cell gap 241A in the center part of 201). That is, nonuniformity of cell spacing occurs, which causes display nonuniformity of the liquid crystal display panel.

4 is a schematic cross-sectional view showing a liquid crystal display panel according to a first embodiment of the present invention after performing aging of the color liquid crystal display module.

In the liquid crystal display panel according to the present embodiment, between the TAC layer 6A and the color filter substrate 3 of the stress relaxation polarizing film 11A, and the TAC layer 6A and the TFT substrate of the stress relaxation polarizing film 11B. The stress relaxation layer 10 is located between (2), respectively. Therefore, even if the TAC layers 6A and 6B of each of the stress relaxation polarizing films 11A and 11B shrink due to the applied heat during the aging process of the color liquid crystal display module, the contraction pressure of the TAC layers 6A and 6B is relaxed. , TFT substrate 2 and color filter substrate 3 are not transferred. As a result, the TFT substrate 2 and the color filter substrate 3 are not bent, and the color liquid crystal substrate assembly 1 is not deformed into the concave lens form. Therefore, the cell gaps 41A to 41C of the color liquid crystal substrate assembly 1 do not change with position and become uniform. Therefore, display nonuniformity does not occur in the color liquid crystal display panel according to the present embodiment.

In addition, by using the structure of the liquid crystal display panel according to the present embodiment, the following advantageous effects can be obtained. In other words, when the color filter substrate 2 and the color filter substrate 3 are bonded to each other by the color filter substrate 2 and the TFT substrate 3, the TFT substrate 2 and the color filter substrate 3 are bonded to each other. The warpage phenomenon can be alleviated due to the stress contained therein and the stress caused by the sealing material 4. Each of the polarizing films 211A and 211B of the conventional liquid crystal display panel shown in FIG. 7 is manufactured by stacking the TAC layer 206A, the PVA layer 207 and the TAC layer 206B, thereby reducing the thickness of the adhesive layer. It is because it has a thickness of about 200㎛ including. On the other hand, in this embodiment, the thickness of the stress relaxation layer 10 is about 200 mu m, and the total thickness of each of the stress relaxation polarizing films 11A and 11B is about 430 mu m including the thickness of the adhesive layer. That is, the thickness of each of the stress relaxation polarizing films 11A and 11B is much thicker than the thickness of each of the conventional polarizing films 111A and 111B. Therefore, in this embodiment, the stiffness of each of the stress relaxation polarizing films 11A and 11B is large, and this large stiffness acts to alleviate the above-described warping of the TFT substrate 2 and the color filter substrate 3. Do it.

In this manner, according to the present embodiment, it is possible to prevent nonuniformity in cell spacing caused by warping in substrates such as a TFT substrate and a color filter substrate, thus preventing display nonuniformity of the liquid crystal display panel.

Example 2

5 is a schematic cross-sectional view of a liquid crystal display panel according to a second embodiment of the present invention.

The liquid crystal display panel according to the second embodiment has substantially the same structure as that of the liquid crystal display panel according to the first embodiment except for the structure of the stress relaxation polarizing film.

That is, as shown in FIG. 5, the color liquid crystal display panel 112 according to the second embodiment of the present invention is a color liquid crystal substrate assembly 101 and a stress relaxation polarizing film attached to both surfaces of the color liquid crystal substrate assembly 101. And 111A and 111B. The color liquid crystal substrate assembly 101 includes a TFT substrate 102 having thin film transistors (TFTs) formed on a glass substrate (not shown), and a color filter substrate 103 having a color filter formed on the glass substrate (not shown). It is provided. On each inner surface of the TFT substrate 102 and the color filter substrate 103, an alignment layer is formed, and alignment processing is performed here. The TFT substrate 102 and the color filter substrate 103 are opposed to each other and bonded through a sealing material 104 made of epoxy resin or the like treated by heat treatment or the like. A spacer 119 and a transfer (not shown) are positioned between the TFT substrate 102 and the color filter substrate 103. In addition, the liquid crystal material 105 is injected into the space between the TFT substrate 102 and the color filter substrate 103.

The stress relaxation polarizing films 111A and 111B are attached on the TFT substrate 102 and the CF substrate 103 of the color liquid crystal substrate assembly 101, respectively. The stress relaxation polarizing films 111A and 111B have the same structure. Each of the stress relaxation polarizing films 111A and 111B has an adhesive layer 109A, a TAC layer 106A, a PVA layer 107 as a polarizer, and another TAC layer from the side of the TFT substrate 102 or the CF substrate 103. It has a multilayer or laminated structure provided with 106B, another adhesion layer 109B, the stress relaxation layer 110, and the protective film 130. As shown to FIG.

In this embodiment, the stacking order of each layer of each of the stress relaxation polarizing films 111A and 111B is different from the stacking order of each layer of each of the stress relaxation polarizing films 111A and 111B in the first embodiment. However, the stress relaxation layer 110 in the second embodiment may be the same as the stress relaxation layer in the first embodiment, and a detailed description thereof is omitted here.

Now, a manufacturing process of the liquid crystal display panel according to the second embodiment of the present invention will be described.

6 is a flowchart illustrating a manufacturing process of a liquid crystal display panel according to a second embodiment of the present invention.

In order to manufacture the PVA film 107, a PVA sheet having a thickness of 50 mu m is wound with a roll. In step S21, the PVA sheet is extended from the roll. In step S22, the extended PVA sheet is impregnated with a solution containing iodine or dye, and thus ions or dyes are permeated into the PVA sheet along the extending direction.

In order to improve the mechanical strength and humidity or waterproofing, in step S23, to prepare the TAC layers 106A and 106B, while the TAC films each having a thickness of 80 μm extend both TAC films, the PVA sheet 107 Are attached on both sides.

Next, in step S24, for example, the adhesive layers 109A and 109B made of acrylic resin or the like are applied on the TAC films 106A and 106B, respectively. Thereafter, in step S25, the separator is attached onto the adhesive layers 109A and 109B, respectively. In step S26, the laminated body made of the separator, the adhesive layer 109B, the TAC layer 106B, the PVA layer 107, the TAC layer 106A, the adhesive layer 109A, and the separator, for example, uses a Thomson cutter or the like. As a result, it is cut into a size corresponding to the size of the predetermined color liquid crystal substrate assembly.

Thereafter, the separator on the adhesive layer 109B is peeled off, and a stress relaxation layer 110 made of polyester and having a thickness of about 200 μm is attached in step S27. In step S28, the protective film 130 is deposited on the surface of the stress relaxation layer 110. In this way, the stress relaxation polarizing films 111A and 111B are completed.

Next, in step S29 for manufacturing the color liquid crystal substrate assembly, an alignment process is performed on each color filter substrate 103 and the TFT substrate 102 already prepared. Thereafter, a sealing material 104 is applied to one of the color filter substrate 103 and the TFT substrate 102. In addition, on the other one of the color filter substrate 103 and the TFT substrate 102, a transfer material for electrical conduction is applied, and the material for the spacer 119 is sprayed. Thereafter, the color filter substrate 103 and the TFT substrate 102 face each other, so that both substrates are aligned, and the sealing material 104 is heat treated. Thereafter, the liquid crystal material 105 is injected into the space between the color filter substrate 103 and the TFT substrate 102 through a charging port not shown in the figure, and then the charging port is closed or sealed. Thus, the color liquid crystal substrate assembly 101 is completed. In step S30, on both sides of the color liquid crystal substrate assembly 101, that is, on the outer surface of the color filter substrate 103 and the TFT substrate 102, the stress-relieving polarizing films 111A and 111B from which the separator is peeled off are It adheres by using the adhesion layer 109A, respectively. Subsequently, in step S30, between the stress relaxation polarizing film 111A and the color liquid crystal substrate assembly 101 and between the stress relaxation polarizing film 111B and the color liquid crystal substrate assembly 101 by a process using an autoclave. Bubbles and pupils of are removed.

The following process steps are substantially the same as those of the first embodiment.

That is, in step S31, a color liquid crystal display module is manufactured. Specifically, TCP is connected to the TFT substrate 102 so that the conductive terminal of the TCP is connected to the terminal of the TFT substrate 102 by using compression bonding or pressure welding. In addition, the protective film 130 is peeled off, and the chassis having the printed circuit board, the back light unit and the signal circuit board is assembled with the color liquid crystal substrate assembly 101. Thus, the color liquid crystal display module is completed. In step S32, the color liquid crystal module assembled in this manner is aged at a thermostat of about 50 degrees Celsius. Then, in step S33, the color liquid crystal display module is inspected by one or more inspection devices.

The liquid crystal display panel according to the second embodiment has an effect almost similar to that of the liquid crystal display panel according to the first embodiment. That is, according to the second embodiment, it is possible to prevent the nonuniformity of the cell gap caused by the warp in the substrate such as the TFT substrate and the color filter substrate, thereby preventing the display nonuniformity of the liquid crystal display panel.

In the liquid crystal display panel and the method for manufacturing the liquid crystal display panel according to the present invention, the cell gap does not change depending on the panel position, and it is possible to maintain a uniform gap gap throughout the panel.

In addition, even when the liquid crystal display panel is in a high temperature environment, for example, in a high temperature atmosphere during the aging process, the shrinkage pressure of the polarizing film, in particular the TAC layer, is alleviated by the stress relaxation layer, and caused by the warpage of the substrate such as the TFT substrate and the color filter substrate. The nonuniformity of cell spacing can be prevented. Therefore, the cell spacing does not change with the panel position, and it is possible to maintain a uniform spacing throughout the panel.

As a result, according to the present invention, display nonuniformity of the liquid crystal display panel can be prevented, and display quality can be improved.

In addition, according to the present invention, the warpage of the substrate can be properly prevented even in a large liquid crystal display panel. Therefore, regardless of the size of the liquid crystal display panel, display unevenness can be prevented to improve display quality.

In the foregoing specification, the invention has been described with reference to specific embodiments. However, one of ordinary skill in the art appreciates that various modifications and variations can be made without departing from the scope of the present invention as set forth in the claims below. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of present invention. Therefore, it is intended that the present invention cover all modifications and variations that come within the scope of the appended claims.

Claims (18)

TFT substrate; Color filter substrates; A liquid crystal material filling a space between the TFT substrate and the color filter substrate; A first polarizing film positioned outside the color filter substrate; A second polarizing film positioned outside the TFT substrate; And It is made of at least one material selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate, characterized in that it comprises at least one stress relieving layer which prevents warping in the color filter substrate or the TFT substrate. Liquid crystal display panel. The liquid crystal display panel according to claim 1, wherein the stress relaxation layer prevents warping in the color filter substrate or the TFT substrate caused by shrinking the stress of the first polarizing film or the second polarizing film. The liquid crystal display panel of claim 1, wherein the at least one stress relieving layer is positioned in contact with the first and / or second polarizing film. The liquid crystal display panel of claim 1, wherein the at least one stress relaxation layer is positioned between the first polarizing film and the color filter substrate and / or between the second polarizing film and the TFT substrate. 10. The display device of claim 1, wherein the at least one stress relieving layer is on a side of the surface of the first polarizing film opposite the surface facing the color filter substrate and / or the second facing the surface facing the TFT substrate. It is located on the side part of the surface of a polarizing film, The liquid crystal display panel characterized by the above-mentioned. The method of claim 1, wherein each of the first and second polarizing films has a polyvinyl alcohol (PVA) layer and a pair of triacetyl cellulose (TAC) layers attached on both sides of the PVA layer. Liquid crystal display panel. 7. The liquid crystal display panel of claim 6, wherein the stress relaxation layer is attached on one of the TAC films of the first polarizing film and on one of the TAC layers of the second polarizing film through an adhesive layer, respectively. . The liquid crystal display panel of claim 1, wherein the stress relaxation layer comprises a single layer made of a material selected from the group consisting of polyester, polyethylene, polymethyl methacryl, and polycarbonate. The liquid crystal display according to claim 1, wherein the stress relaxation layer has a multilayer structure having a plurality of layers each made of a material selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate. panel. At least one first triacetyl cellulose (TAC) layer, a polyvinyl alcohol (PVA) layer on the first TAC layer, a second TAC layer on the PVA layer, polyester, polyethylene, polymethyl methacryl and polycarbonate Preparing first and second stress relaxation polarizing films each having a stress release layer on the second TAC layer, made of one or more materials selected from the group consisting of; Preparing a color liquid crystal substrate assembly having a color filter substrate, a TFT substrate, and a liquid crystal material filling a space between the color filter substrate and the TFT substrate; And And attaching the first and second stress relaxation polarizing films onto the color filter substrate and the TFT substrate, respectively. 11. The method of claim 10, wherein the stress relaxation layer of the first stress relaxation polarizing film prevents warping in the color filter substrate caused by shrinking the stress of the first or second TAC layer of the first stress relaxation polarizing film. And the stress relaxation layer of the second stress relaxation polarizing film prevents warping in the TFT substrate caused by shrinking the stress of the first or second TAC layer of the second stress relaxation polarizing film. The manufacturing method of a liquid crystal display panel. The method of claim 10, wherein the manufacturing step of the first and second stress relaxation polarizing film, Attaching each of the first and second TAC layers on both sides of the PVA layer; Applying an adhesive layer to the second TAC layer; And And applying the stress release layer onto the adhesive layer on the second TAC layer. The method of claim 12, wherein the manufacturing of the first and second stress relaxation polarizing films further comprises applying an adhesive layer on the stress relaxation layer. In the step of attaching the first and the second stress relaxation polarizing film on the color filter substrate and the TFT substrate, the first stress relaxation polarizing film is the adhesive layer on the stress relaxation layer of the first stress relaxation polarizing film. Is attached on the color filter substrate, and the second stress relaxation polarizing film is attached on the TFT substrate through the adhesive layer on the stress relaxation layer of the second stress polarizing film. Way. The method of claim 12, wherein the manufacturing of the first and second stress relaxation polarizing films further comprises applying an adhesive layer on the first TAC layer, In the step of attaching the first and the second stress relaxed polarizing film on the color filter substrate and the TFT substrate, the first stress relaxed polarizing film is the adhesive layer on the first TAC layer of the first stress relaxed polarizing film. Is attached on the color filter substrate via the second stress relaxation polarizing film, and is attached on the TFT substrate through the adhesive layer on the first TAC layer of the second stress relaxation polarizing film. Method of manufacturing the panel. The method of claim 10, wherein the stress relaxation layer comprises a single layer made of a material selected from the group consisting of polyester, polyethylene, polymethyl methacryl, and polycarbonate. The method of claim 10, wherein the stress relaxation layer is a plurality of each made of a material selected from the group consisting of polyester, polyethylene, polymethyl methacryl and polycarbonate after the plurality of layers alternately extend in two different directions It has a multilayer structure manufactured by stacking the layers of the liquid crystal display panel manufacturing method characterized by the above-mentioned. The method of claim 10, wherein the step of manufacturing the first and second stress relaxation polarizing film, Extending the PVA membrane and impregnating the PVA membrane with an ionic solution; Attaching a first TAC film and a second TAC film on both sides of the PVA film; Applying a first adhesive layer onto the second TAC film; Attaching a separator on the first adhesive layer and attaching a protective film on the first TAC film; Cutting the laminated body including the protective film, the first TAC film, the PVA film, the second TAC film, the first adhesive layer, and the separator into a predetermined size; Peeling the separator from the first adhesive layer and attaching the stress relaxation layer on the first adhesive layer; And Applying a second adhesive layer to the stress relaxation layer; In the step of attaching the first and second stress relaxation polarizing films on the color filter substrate and the TFT substrate, the first stress relaxing polarizing film is passed through the second adhesive layer of the first stress relaxing polarizing film. And a second stress relaxation polarizing film is attached on the TFT substrate via the second adhesive layer of the second stress relaxation polarizing film. The method of claim 10, wherein the step of manufacturing the first and second stress relaxation polarizing film, Extending the PVA membrane and impregnating the PVA membrane with an ionic solution; Attaching a first TAC film and a second TAC film on both sides of the PVA film; Applying a first adhesive layer and a second adhesive layer onto the first TAC film and the second TAC film, respectively; Attaching a first separator and a second separator onto the first adhesive layer and the second adhesive layer, respectively; Cutting the laminated body including the first separator, the first adhesive layer, the first TAC membrane, the PVA membrane, the second TAC membrane, the second adhesive layer, and the second separator to a predetermined size. ; Peeling off the second separator from the second adhesive layer and attaching the stress relaxation layer on the second adhesive layer; And Attaching a protective film on the stress relief layer, After the peeling of the first separator, in the step of attaching the first and second stress relaxation polarizing film on the color filter substrate and the TFT substrate, the first stress relaxation polarizing film is the A liquid crystal display panel attached to the color filter substrate through a first adhesive layer, and the second stress relaxed polarizing film is attached to the TFT substrate through the first adhesive layer of the second stress relaxed polarizing film. Method of preparation.