KR20070118488A - Polarizer assembly, manufacturing method thereof and method for making display device using the same - Google Patents

Abstract

A polarizer assembly and a method for manufacturing the same, a method for manufacturing a display device are provided to prevent the generation of electrostatic and to compensate a viewing angle, thereby improving an image displaying quality. A polarizer assembly includes a polarizer(110) of a plate type. The polarizer polarizes a light incident from an exterior. A compensating film(130) is formed at one surface of the polarizer. An adhesive layer(140) is formed on the compensating film. An adhesive layer protecting film(150) is attached at the adhesive layer. The adhesive layer protecting film has a conductibility material. A polarizer protecting film(120) is arranged to one surface of the polarizer to prevent the polarizer from being damaged and contaminated by a scratch a contamination material applied from an exterior.

Description

POLARIZER ASSEMBLY, MANUFACTURING METHOD THEREOF AND METHOD FOR MAKING DISPLAY DEVICE USING THE SAME}

1 is a perspective view illustrating a polarizer assembly according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the polarizer assembly taken along II-II of FIG. 1.

3A to 3C are cross-sectional views illustrating a method of manufacturing a polarizing plate assembly according to an exemplary embodiment of the present invention.

4A and 4B are cross-sectional views illustrating a method of manufacturing a display device using a polarizer assembly according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

50: electrostatic charge 100: polarizer assembly

110: polarizing plate 120: polarizing plate protective film

130: compensation film 140: adhesive layer

150: adhesive layer protective film 160: conductive material

200: liquid crystal display panel 210: first substrate

220: second substrate 230: liquid crystal layer

The present invention relates to a polarizing plate assembly, a method of manufacturing the same, and a method of manufacturing a display device using the polarizing plate assembly. More specifically, the polarizing plate assembly capable of simultaneously suppressing the generation of static electricity and compensating viewing angle compensation, and a manufacturing method thereof A method for manufacturing a display device.

Liquid crystal displays display images using liquid crystals. The liquid crystal display device has advantages of thinner, lighter weight, lower power consumption, and lower driving voltage than other display devices.

On the other hand, the liquid crystal display has a disadvantage in that the vertical viewing angle is narrower than other display devices. Therefore, the liquid crystal display requires compensation of the viewing angle.

In addition, the liquid crystal display generally includes a liquid crystal display panel for displaying an image using a light transmittance of a liquid crystal, and a backlight assembly disposed under the liquid crystal display panel to provide light to the liquid crystal display panel. (back-light assembly). In this case, non-polarized light that is oscillated in various directions is generally emitted from the backlight assembly.

Since the liquid crystal interposed in the liquid crystal display panel determines light transmittance using birefringence of light, polarized light should be incident on the liquid crystal display panel. Therefore, the liquid crystal display should further include a polarizer assembly for converting the non-polarized light into polarized light.

In general, the polarizing plate assembly includes a polarizing plate, an adhesive layer formed on the upper surface of the polarizing plate, an adhesive layer protective film disposed on the adhesive layer, and a polarizing plate protective film disposed on the lower surface of the polarizing plate. In this case, the polarizing plate is attached to one surface of the liquid crystal display panel through the adhesive layer after removing the adhesive layer protective film of the polarizing plate assembly.

However, static electricity may be generated when the adhesive layer protective film is removed from the polarizer assembly. When the static electricity is attached to one surface of the liquid crystal display panel, the static electricity adversely affects the liquid crystal display panel to generate an electrostatic stain, thereby reducing the display quality.

Accordingly, an aspect of the present invention is to provide a polarizer assembly for suppressing the generation of static electricity and compensating the viewing angle to improve display quality of an image.

Another object of the present invention is to provide a method of manufacturing the polarizing plate assembly.

Another object of the present invention is to provide a method of manufacturing a display device using the polarizer assembly.

Polarizing plate assembly according to an aspect of the present invention for solving the above technical problem is a polarizing plate for polarizing light, a compensation film formed on one surface of the polarizing plate, the adhesive layer formed on the compensation film and the adhesive layer is attached, and conductive The adhesive layer protective film which has a is included.

The adhesive protective film includes a conductive material, and the conductive material includes any one material selected from the group consisting of copper, aluminum, and polypyrrole.

In this case, the compensation film includes a c-plate. In addition, the compensation film may further include an a-plate.

In order to protect the polarizing plate may further include a polarizing plate protective film disposed on the other surface of the polarizing plate.

According to another aspect of the present invention, a method of manufacturing a polarizing plate assembly includes preparing a polarizing plate, attaching a compensation film to one surface of the polarizing plate, forming an adhesive layer on the compensation film, and having conductivity on the adhesive layer. Attaching a pressure-sensitive adhesive layer protective film.

The method may further include attaching a polarizing plate protective film to the other surface of the polarizing plate.

According to another aspect of the present invention, a method of manufacturing a display device includes a polarizing plate that polarizes light, a compensation film formed on one surface of the polarizing plate, an adhesive layer formed on the compensation film, and an adhesive layer, and an adhesive having conductivity Providing a polarizing plate assembly including a layer protective film, removing the adhesive layer protective film, aligning the polarizing plate assembly from which the adhesive layer protective film has been removed to match the display panel, and the adhesive layer protective film Attaching the removed polarizer assembly to the display panel.

Specific details of other embodiments are included in the detailed description and drawings.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms.

References herein to “top”, “top”, “top” or “bottom”, “bottom” of a layer or film include intervening another layer or film. In addition, as used herein, "overlapping" indicates a shape in which the lower structure and the upper structure have a common center and overlap each other, and includes a case where another structure is interposed between the lower structure and the upper structure, and the upper structure and the lower structure. Any one of the structures is meant to completely overlap the other structure.

Hereinafter, a display device and a manufacturing method thereof according to an exemplary embodiment will be described with reference to the accompanying drawings.

1 is a perspective view illustrating a polarizing plate assembly according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the polarizing plate assembly of FIG. 1 taken along line II-II.

1 and 2, the polarizing plate assembly 100 may include a polarizing plate 110, a polarizing plate protective film 120, a compensation film 130, an adhesive layer 140, and an adhesive layer on which a conductive material 160 is dispersed. Film 150.

The polarizing plate 110 has a plate shape and polarizes the light incident from the outside and emits the light. That is, the polarizer 110 changes non-polarized light vibrating in various directions into polarized light vibrating only in one direction.

The polarizer 110 may include, for example, poly vinyl alcohol (PVA) and dichroic material (I ₂ , Cl ₂ ) for polarizing light in a specific direction in the poly vinyl alcohol (PVA). In this case, the polarization axis of the polarizing plate 110 is determined according to the dichroic material (I ₂ , Cl ₂ ) in which the polyvinyl alcohol (PVA) is arranged in what form and what size.

Since the polarizer 110 is easily deteriorated by moisture, a waterproofing agent (not shown) may be applied to the ends of the polarizer 110 to prevent the moisture from penetrating into the polarizer 110.

The polarizing plate protective film 120 is disposed on one surface of the polarizing plate 110 to protect the polarizing plate 110. That is, the polarizing plate protective film 120 prevents the polarizing plate 110 from being damaged or contaminated due to scratches and contaminants from the outside. The polarizing plate protective film 120 may be made of a transparent synthetic resin, and may be, for example, a polyvinyl (PV) film, a low density polyester film, or a polyethylene terephthalate film.

The compensation film 130 is disposed on the other surface opposite to one surface of the polarizing plate on which the polarizing plate protective film 120 is disposed.

In general, the liquid crystal used in the liquid crystal display device exhibits birefringence characteristics having different refractive indices in the long axis direction and the short direction direction of the molecules, and the polarized light passing through the liquid crystal in the direction facing the liquid crystal display device The distance is different. Therefore, the phase change of the light determined by the birefringence and the distance passing through the liquid crystal varies depending on the front direction and the side direction. Due to the phase difference, problems such as a change in contrast ratio, color shift, and gray inversion occur according to the viewing angle of the liquid crystal display.

In order to solve this problem, the compensation film 130 is formed on the other surface of the polarizing plate. The compensation film solves the viewing angle problem by compensating for a change in phase of light generated while passing through the liquid crystal in the opposite direction. The compensation film 130 uses different types of compensation films depending on the mode of the liquid crystal. For example, when the liquid crystal is in TN mode (Twist Nematic), the refractive index on the same plane is the same, but the refractive index in the direction perpendicular to the plane is different (Nx = Ny> Nz or Nz <Nx = Ny). When the plate is used and the liquid crystal is in VA mode (Vertical Alignment), the refractive indices on the c-plate and the same plane are different from each other, but the refractive index in the direction perpendicular to the plane is the same as the refractive index of the x or y axis on the plane. (Relationship of Nx = Nz> Ny or Ny = Nz> Nx) An a-plate is used as the compensation film 130.

The adhesive layer 140 is formed on the compensation film 130. The adhesive layer 140 is preferably made of urea resin, for example, may be made of PSA (Pressure Sensitive Adhesive) excellent in adhesion, heat resistance and moisture resistance. The adhesive layer 140 attaches the polarizing plate 110 to one surface of a display panel (not shown).

The adhesive layer protective film 150 is disposed on the adhesive layer 140 to protect the adhesive layer 140. That is, the adhesive layer protective film 150 protects the adhesive layer 140 from the outside environment, thereby maintaining the adhesive force of the adhesive layer 140. The adhesive layer protective film 150 may be formed of a transparent material through which light may be transmitted to visually inspect the polarizing plate 110 and the adhesive layer 140 to determine whether an inflow of foreign substances and defects are present.

After removing the adhesive layer protective film 150 from the polarizer assembly 100, the polarizer 110 is attached to one surface of the display panel. At this time, the adhesive layer protective film 150 is made of a synthetic resin, it should be easily separated from the adhesive layer 140.

The conductive material 160 is irregularly distributed in the adhesive layer protective film 150 to absorb the electrostatic charge 50 generated when the adhesive layer protective film 150 is removed to display an image display quality of the display device. This prevents it from falling.

The conductive material 160 may be a conductive polymer such as polypyrrole, poly thiophene, poly aniline, or copper (Cu), aluminum (Al), silver (Ag), or ITO (Indium-). Tin Oxide) and metals such as ATO (Antimony-Tin Oxide) can be used.

When a large amount of the conductive material 160 is distributed in the adhesive layer protective film 150, the electrostatic charge is absorbed more to prevent deterioration of display quality due to static electricity, but light passing through the polarizing plate assembly 100. It is difficult to visually inspect the polarizing plate 110 and the adhesive layer 140 due to the low light transmittance. Therefore, the conductive material 160 is preferably distributed in the adhesive layer protective film 150 within a range not lowering the light transmittance below a reference value.

Hereinafter, a method of manufacturing a polarizing plate assembly according to an embodiment of the present invention will be described with reference to FIGS. 3-a to 3-c.

As shown in FIG. 3-A, first, a polarizing plate 110 having a plate shape is prepared.

Thereafter, as illustrated in FIG. 3-b, a compensation film 130 is formed on one surface of the polarizing plate 110. The compensation film 130 includes at least one of an a-plate and a c-plate as described above. After applying an adhesive (not shown) for adhering the compensation film 130 to one surface of the polarizing plate 110, the compensation film 130 is adhered to the polarizing plate.

Thereafter, as shown in FIG. 3-c, an adhesive layer protective film 150 including an adhesive layer 140 and a conductive material 160 is formed on the compensation film 130. The adhesive layer 140 may be formed by applying urea resin having an adhesive force to one surface of the polarizing plate 110.

Thereafter, the adhesive layer protective film 150 is attached onto the adhesive layer 140. The adhesive layer protective film 150 protects the adhesive layer 140 to maintain the adhesive force of the adhesive layer 140. The adhesive layer protective film 150 includes a conductive material 160.

The conductive material 160 is formed by coating an organic material or a surfactant on the surface, or is formed by depositing or plating a conductive metal on the surface, coating or depositing the conductive polymer by making it soluble, or forming ITO or ATO by alcohol or the like. It may be formed by coating and depositing by dispersing in a solvent. When the conductive material 160 is formed on the adhesive layer protective film 150, since the film temperature may increase and deformation may occur, the process must be performed while maintaining a low temperature. Since the adhesive layer protective film 150 and the polarizing plate protective film 120 are usually made of polyethylene terephthalate (PET-poly (ethylene terephthalte)), the process temperature is about 80 ° C. or less, which is the glass transition temperature (Tg) of PET. Must be maintained.

Thereafter, the polarizing plate protective film 120 is attached to the other surface of the polarizing plate 110. That is, the polarizing plate protective film 120 is attached to the other surface of the polarizing plate 410 so as to face one surface of the polarizing plate 110 on which the adhesive layer 140 is formed.

In the manufacturing method of the polarizing plate assembly 100 according to the embodiment of the present invention, the polarizing plate protective film 120 is described as a final step, but is not limited thereto.

Hereinafter, a manufacturing method of manufacturing a display device using a polarizer assembly according to an exemplary embodiment of the present invention will be described with reference to FIGS. 4-A to 4-B.

First, as shown in Figure 4-a to remove the adhesive layer protective film 150 of the polarizing plate assembly 100 according to an embodiment of the present invention.

When removing the adhesive layer protective film 150 of the polarizing plate assembly 100, a static charge 50 may be generally generated between the adhesive layer 140 and the display panel in friction. The electrostatic charge 50 is removed by being absorbed by the conductive material 160 formed on the adhesive layer protective film 150.

After removing the adhesive layer protective film 150, the polarizer assembly 100 is aligned to match the display panel 200. This alignment can be done by hand or by a mechanical device such as a jig.

Subsequently, as illustrated in FIG. 4-2, the polarizing plate assembly 100 from which the adhesive layer protective film 150 is removed is attached to one surface of the display panel 200. That is, the polarizing plate assembly 100 is attached to one surface of the display panel 200 by the adhesive layer 140 exposed to the outside as the adhesive layer protective film 150 is removed.

Since the electrostatic charge 50 is removed, the polarizer assembly 100 does not adversely affect the display panel 200. In this case, the display panel 200 includes a first substrate 210, a second substrate 220, and a liquid crystal layer 230.

The first substrate 210 includes a plurality of pixel electrodes arranged in a matrix, a thin film transistor (TFT) and a thin film transistor (TFT) for applying a driving voltage to each pixel electrode. ) And a gate line and a data line connected to each other.

The second substrate 220 is disposed to face the first substrate 210. The second substrate 220 includes a common electrode and a color filter which are disposed on the front surface of the second substrate 220 and are transparent and conductive.

The liquid crystal 230 is interposed between the first substrate 210 and the second substrate 220.

In the drawing, only the polarizer assembly 100 from which the adhesive layer protective film 150 is removed is attached to the first substrate 210 of the display panel 200. However, the polarizer assembly is different from the first substrate. And a pair may be attached to face both sides of the second substrate (210, 220).

According to the present embodiment, the electrostatic charge 50 is removed by removing the electrostatic charge 50 generated when the adhesive layer protective film 150 is separated from the polarizing plate assembly 100 through the conductive material 160. It may be possible to prevent adverse effects on the display panel 200.

As described above, the present invention provides a polarizing plate assembly and a method of manufacturing the same, which can improve the display quality of an image by suppressing generation of static electricity and compensating a viewing angle.

The present invention also provides a method of manufacturing the polarizer assembly and a method of manufacturing a display device using the polarizer assembly.

Claims (9)

A polarizing plate for polarizing light; A compensation film formed on one surface of the polarizing plate; An adhesive layer formed on the compensation film; And Attached to the pressure-sensitive adhesive layer, a polarizing plate assembly comprising a pressure-sensitive adhesive layer protective film. The method of claim 1, The adhesive protective film is a polarizing plate assembly containing a conductive material. The method of claim 2, And the conductive material includes any one material selected from the group consisting of copper, aluminum, and polypyrrole. The method of claim 1, Wherein said compensation film comprises a c-plate. The method of claim 4, wherein Wherein said compensation film further comprises an a-plate. The method of claim 1, And a polarizing plate protective film disposed on the other surface of the polarizing plate to protect the polarizing plate. Providing a polarizing plate; Attaching a compensation film to one surface of the polarizer; Forming an adhesive layer on the compensation film; And A method of manufacturing a polarizing plate assembly comprising attaching a pressure-sensitive adhesive layer protective film comprising a conductive material on the pressure-sensitive adhesive layer. The method of claim 7, wherein And attaching a polarizing plate protective film to the other surface of the polarizing plate. Providing a polarizing plate assembly including a polarizing plate for polarizing light, a compensation film formed on one surface of the polarizing plate, a pressure-sensitive adhesive layer formed on the compensation film, and a pressure-sensitive adhesive layer protective film attached to the pressure-sensitive adhesive layer; Removing the adhesive layer protective film; Aligning the polarizing plate assembly from which the adhesive layer protective film has been removed to match the display panel; And And attaching the polarizing plate assembly from which the adhesive layer protective film is removed, to the display panel.

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