KR20080027565A - Polarizer - Google Patents

Abstract

A polarizer is provided to protect a liquid crystal display device by preventing static electricity between a protection film and the polarizer in a process of removing the protection film by forming a static electricity preventing adhesive between the polarizer and the protection film. A polarizer includes a main body of a polarizer, a protection film, and an adhesive. The protection film is formed on one side of the polarizer. The adhesive is formed on the other side of the polarizer. The protection film includes a main body of the protection film and a static electricity preventing adhesive(15-2) formed between the main body of the protection film and the main body of the polarizer. The main body of the polarizer includes PVA(Polyvinyl Alcohol) and TAC(Tri Acetate Cellulose). The TAC is formed on both sides of the main body of the polarizer with respect to the PVA. The main body of the protection film is composed of a PET(Polyethylene Terephthalate) film(15-1).

Description

Polarizing Plate {POLARIZER}

1 is a diagram illustrating a cross-sectional structure of a liquid crystal display device.

2 is a view showing a cross-sectional structure of a polarizing plate according to an embodiment of the present invention.

3 to 5 is a view showing a cross-sectional structure of a polarizing plate protective film according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating damage due to static electricity that may occur when the protective film is removed from the polarizer of the liquid crystal display.

<Description of Drawing>

3: liquid crystal layer 12, 22: polarizing plate

12-1: PVA 12-2: TAC

15, 25: protective film 15-1: PET film

15-2: Antistatic Adhesive 15-3: Antistatic Layer

16: release film 17: surface treatment layer

18: pressure-sensitive adhesive 100: thin film transistor array panel

110: substrate 150: pixel

180: connection part 200: color filter display plate

210: upper substrate 220: black matrix

230: color filter 250: planarization film

270: common electrode 300: spacer

310: sealing material 400: flexible printed circuit board

500: PCB

The present invention relates to a polarizing plate.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display includes two display panels on which field generating electrodes such as a pixel electrode and a common electrode are formed, and a liquid crystal layer interposed therebetween. Is applied to generate an electric field in the liquid crystal layer, thereby determining the orientation of liquid crystal molecules in the liquid crystal layer and controlling the polarization of incident light to display an image.

The polarizing plates affixed on the outer side of a liquid crystal display device each have a protective film further, and prevents damage to a polarizing plate during the manufacturing process of a liquid crystal display device. After manufacturing of the liquid crystal display device, the protective film is removed. In this case, the static electricity generated when the protective film is removed may cause driving IC, timing controller, and liquid crystal damage in the liquid crystal display device. There is a problem.

The technical problem to be achieved by the present invention is an invention for preventing damage to the liquid crystal display device due to static electricity even when removing the protective film of the polarizing plate.

In order to solve this problem, in the present invention, it is possible to prevent the static electricity in the protective film itself of the polarizing plate.

Specifically, the polarizing plate according to the embodiment of the present invention includes a polarizing plate body, a protective film formed on one side of the polarizing plate, an adhesive formed on the other side of the polarizing plate, the protective film is a protective film body and an antistatic adhesive It includes, The antistatic adhesive is formed between the protective film body and the polarizing plate body.

The polarizer body may include a PVA and a TAC.

The polarizing plate body may have TACs formed at both sides of the PVA.

The main body of the protective film may be formed of a PET film.

A surface treatment layer may be formed on the protective film side surface of the polarizing plate.

The release film may be formed on the outer side of the pressure-sensitive adhesive formed on the other side of the polarizing plate.

An antistatic layer may be formed on one surface of the main body of the protective film.

The antistatic layer may be formed between the main body of the protective film and the antistatic adhesive.

The antistatic adhesive may be formed by adding an antistatic material to the adhesive.

The antistatic material may be a conductive polymer, an ionic surfactant, metal particles, and polymer particles on which a metal film is coated.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

First, a liquid crystal display including a polarizing plate according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a diagram illustrating a cross-sectional structure of a liquid crystal display device.

As shown in FIG. 1, the liquid crystal display according to the exemplary embodiment of the present invention includes a thin film transistor array panel 100, a color filter panel 200, a liquid crystal layer 3, and a sealing material 310.

In more detail, the lower polarizer 12 is attached to the lower surface of the thin film transistor array panel 100. Meanwhile, the upper polarizer 22 is attached to the upper surface of the color filter display panel 200. The lower protective film 15 and the upper protective film 25 are attached to the outer side of the lower polarizing plate 12 and the upper polarizing plate 22, respectively. After the liquid crystal display is completed, the protective films 15 and 25 are removed. 1 shows the steps before the protective films 15 and 25 are removed.

First, the thin film transistor array panel 100 will be described.

A pixel electrode (not shown) made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) is formed on the substrate 110 made of a transparent insulating material such as glass. It is connected to the thin film transistor to receive an image signal voltage. In this case, the thin film transistor is connected to a gate line for transmitting a scan signal and a data line for transmitting an image signal, respectively, to turn on and off the pixel electrode according to the scan signal. In FIG. 1, reference numeral 150 briefly illustrates each pixel and includes a pixel electrode and a thin film transistor.

On the other hand, the color filter panel 200 is a black matrix 220 and red, green, and blue color filters 230 to prevent light leakage from the edge of the pixel on the substrate 210 also made of a transparent insulating material such as glass ) And a common electrode 270 made of a transparent conductive material such as ITO or IZO.

Meanwhile, a spacer 300 is formed between the thin film transistor array panel 100 and the black matrix display panel 200 to maintain a gap between the two substrates, and the sealing material 310 to prevent the liquid crystal layer 3 from being discharged to the outside. ) Is also formed.

The liquid crystal display will be described in more detail below.

In the thin film transistor array panel 100, a plurality of gate lines may be formed on the lower insulating substrate 110 to transfer gate signals. The gate line mainly extends in the horizontal direction, and a part or the protruding portion of each gate line is used as the gate electrode of the thin film transistor.

The gate line may have a contact portion for transferring a gate signal from the outside to the gate line. Otherwise, the end of the gate line is connected to an output terminal of the gate driving circuit formed directly on the substrate 110.

The storage electrode line is formed on the insulating substrate 110 in the same layer as the gate line. The shape and position where each storage electrode line is formed may vary depending on the embodiment, and may not be formed.

A gate insulating film made of silicon oxide (SiO 2), silicon nitride (SiNx), or the like is formed on the gate line and the storage electrode line.

A semiconductor layer made of hydrogenated amorphous silicon (a-Si) or the like is formed on the gate insulating film. The semiconductor layer is on top of the gate electrode, is formed on the gate insulating film, and becomes a channel of the thin film transistor.

A plurality of linear and island-type ohmic contacts made of a material such as N + hydrogenated amorphous silicon in which silicide or n-type impurities are heavily doped is formed on the semiconductor layer. The ohmic contacts are paired with each other and positioned over the semiconductor layer.

A plurality of data lines, a plurality of source electrodes and a drain electrode are formed on the ohmic contact member and the gate insulating film, respectively.

The data line mainly extends in the vertical direction and crosses the gate line, and transmits a data voltage. A plurality of branches extending toward the drain electrode in each data line form a source electrode. The pair of source and drain electrodes are separated from each other and positioned opposite to each other with respect to the gate electrode 124.

The gate electrode, the source electrode, and the drain electrode form a thin film transistor together with the semiconductor layer, and a channel of the thin film transistor is formed in the semiconductor layer between the source electrode and the drain electrode.

A protective film made of silicon oxide, silicon nitride, or an organic material is formed on the data line, the source electrode, and the drain electrode.

A plurality of pixel electrodes are formed on the passivation layer, and the pixel electrodes are connected to the drain electrodes through the contact holes. The pixel electrode is formed of a transparent conductive film such as ITO or IZO.

The pixel region 150 of FIG. 1 briefly illustrates a configuration including one thin film transistor and one pixel electrode.

In the color filter panel 200 facing the thin film transistor array panel 100, a black matrix 220 is formed under the insulating substrate 210 to prevent light leakage from the pixel edge.

Red, green, and blue color filters 230 are formed in regions where the black matrix 220 is not formed. The planarization layer 250 is generally formed on the color filter 230 and the black matrix 220, and the common electrode 270 is formed on the color filter 230 and the black matrix 220. The common electrode 270 may be formed of a transparent conductor such as ITO or IZO.

On the other hand, one end of the thin film transistor array panel 100 is not covered with the color filter panel 200, and has a connection unit 180, and thus may be connected to the driving ICs.

Connected to the flexible printed circuit board 400 and the PCB 500 through the connection unit 180, the gate line, the date line, and the pixel electrode / common of the thin film transistor through the PCB 500 and the flexible printed circuit board 400. A signal may be applied to the electrode 270.

2 is a view showing a cross-sectional structure of a polarizing plate according to an embodiment of the present invention.

In the polarizing plate 12 according to the exemplary embodiment of the present invention, a triacetate cellulose (TAC) layer 12-2 is formed on both sides of a PVA (polyvinyl alcohol) layer 12-1. The surface treatment layer 17 is formed on the outer side of one of the two TAC layers 12-2, and the adhesive 18 is formed on the other TAC layer 12-2. The protective film 15 is formed on the outer side of the surface treatment layer 17, and the release film 16 is formed on the outer side of the adhesive 18.

In the present exemplary embodiment, the structure including the TAC 12-2 is described in the polarizing plate 12, but alternatively, a Cellular Acetate Propionate (CAP) or a Wide View-TAC (WV-TAC) may be used.

The polarizing plate has a structure as shown in FIG. 2, but when the polarizing plate is attached to the display panels 100 and 200, the release film 16 is removed and attached to the display panels 100 and 200 using the adhesive 18.

In addition, the protective film 15 is a film which is removed after the liquid crystal display device is completed. The surface treatment layer 17 is not necessarily a layer, but is formed to protect the polarizing plate 12 even after the protective film 15 is removed. do. The surface hardness becomes strong by the surface treatment layer 17, and the polarizing plate 12 can be protected from a scratch.

The protective film 15 has the structure of FIGS. 3 to 5 in accordance with an embodiment of the present invention. Hereinafter, the cross-sectional structure of the protective film 15 will be described in detail.

3 to 5 is a view showing a cross-sectional structure of a polarizing plate protective film according to an embodiment of the present invention.

The cross-sectional structure of the polarizing plate protective film 15 according to the embodiment of the present invention is the same as that of FIGS. 3 to 5, and the embodiment of FIG.

According to FIG. 3, the structure of the polarizing plate protective film 15 according to the embodiment of the present invention is for bonding the PET (Polyethylene Terephthalate) film 15-1 and the surface treatment layer 17 of the polarizing plate to form a main body of the protective film. It consists of an antistatic adhesive 15-2.

The antistatic adhesive 15-2 is an adhesive formed by adding an anti static material to a PSA-pressure sensitive adhesive. Antistatic materials include conductive polymers, ionic surfactants, metal particles, and polymer particles having a metal film coated on their surfaces.

The surface treatment layer 17 is located under the antistatic adhesive 15-2.

Meanwhile, in FIG. 4, the antistatic layer 15-3 is formed on the PET film 15-1 in the structure of FIG. 3. The antistatic layer 15-3 is preferably formed by coating on the PET film 15-1. There are various antistatic materials capable of forming the antistatic layer 15-3, including metal oxides such as antimony tin oxide (ATO) and indium tin oxide (ITO), polypyrole, polythiopene, and the like. Conductive polymers, such as polyaniline, are typical.

5 illustrates an embodiment in which the antistatic layer 15-3 is formed on both sides of the PET film 15-1.

3 to 5, the protective film 15 basically forms an antistatic adhesive 15-2 on the side to which the surface treatment layer 17 of the polarizing plate is attached, thereby removing the protective film 15. Do not generate static electricity between (17) and. Therefore, even when the protective film 15 is removed, damage due to static electricity does not occur.

The body of the protective film in the above embodiment shows an embodiment using a PET film, other films may be used.

FIG. 6 is a diagram illustrating damage due to static electricity that may occur when the protective film is removed from the polarizer of the liquid crystal display.

When the protective film 15 is removed after manufacturing the liquid crystal display as shown in FIG. 6, static electricity may be generated between the protective film 15 and the polarizing plate 12, and the static electricity may be generated through the common electrode of the upper substrate. Or the IC of the driving circuit. However, when the adhesive film 15 is attached to the polarizing plate 12 and the attaching surface of the protective film 15 using the antistatic adhesive 15-2, the static electricity is prevented between the protective film 15 and the polarizing plate 12 to prevent the liquid crystal. The display device can be protected.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, when the antistatic adhesive is formed on the polarizing plate and the attachment surface in the protective film, static electricity is prevented between the protective film and the polarizing plate in the process of removing the protective film, thereby protecting the liquid crystal display.

Claims (10)

Polarizer body, A protective film formed on one side of the polarizing plate, It includes an adhesive formed on the other side of the polarizing plate, The protective film includes a protective film body and an antistatic adhesive, wherein the antistatic adhesive is formed between the protective film body and the polarizing plate body. In claim 1, The polarizing plate body includes a PVA and TAC. In claim 2, The polarizing plate body has a TAC is formed on both sides around the PVA. In claim 1, The body of the protective film is a polarizing plate formed of a PET film. In claim 1, The polarizing plate in which the surface treatment layer is formed in the said protective film side surface of the said polarizing plate. In claim 1, The polarizing plate in which a release film is formed in the outer side of the adhesive formed in the other side of the said polarizing plate. In claim 1, Polarizing plate is formed on one surface of the main body of the protective film antistatic layer. In claim 7, The antistatic layer is a polarizing plate formed between the main body of the protective film and the antistatic adhesive. In claim 1, The antistatic adhesive is a polarizing plate formed by adding an antistatic material to the pressure-sensitive adhesive. In claim 9, The antistatic material is a polarizing plate is a conductive polymer, an ionic surfactant, metal particles and polymer particles coated with a metal film on the surface.

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