KR102063206B1 - Polarizing plate and optical display device comprising the same - Google Patents

Abstract

A polarizing plate comprising a display area and a non-display area surrounding the display area, wherein the polarizing plate is a polarizer, and an adhesive layer and a first polarizer protective film are sequentially stacked on one surface of the polarizer, and the adhesive layer is disposed in the non-adhesive layer. A light blocking layer constituting at least a portion of the display area, wherein the light blocking layer is formed with a plurality of print patterns spaced apart from each other, and the print pattern is a first print pattern and a second print pattern formed on the first print pattern. The second print pattern has a pattern shape different from that of the first print pattern, and a point where an interface between the display area and the non-display area is in contact with the first print pattern is immediately adjacent to the first print pattern. A point where the first print pattern is in contact with an interface between the display area and the non-display area is b, and is the most from a in the first print pattern. When c is the contact point and c is the closest point from b in the first printing pattern, d, the distance from c to the boundary between the display area and the non-display area and d from the boundary between the display area and the non-display area. Provided is a polarizing plate and an optical display device including the same, wherein the minimum value H of the distances up to 200 μm or less.

Description

Polarizing plate and optical display including the same {POLARIZING PLATE AND OPTICAL DISPLAY DEVICE COMPRISING THE SAME}

The present invention relates to a polarizing plate and an optical display device including the same.

The optical display device is composed of a display area and a non-display area. The display area is light transmissive so that the image can be viewed through the screen. The non-display area is located at the edge of the display area, surrounds the display area, and mounts a printed circuit board, a driving chip, and the like for driving an image. The non-display area is covered with a light shielding layer or the like so that the non-display area is not visible to the user who uses the optical display device. In general, a method of printing and forming a light shielding layer on a window or manufacturing a separate printing tape and attaching the same to a cover window is used. This can increase the thickness of the optical display device.

On the other hand, since there is no light shielding layer in the display area and the light shielding layer in the non-display area, there is no difference in visibility at the interface between the display area and the non-display area. In particular, when the pattern is formed in the light shielding layer in the non-display area, the uniformity is lowered, thereby making it easier to recognize the luminous difference locally. When light leakage occurs when the display device is driven, the luminous difference may be more severe. This difference in visibility is represented by whether the pixels are red (green, blue) visually when the optical display device is driven. The larger the viewing difference, the better the RGB can be seen. Accordingly, when the pattern is formed on the light shielding layer, a polarizing plate is required to improve the light shielding property and to reduce the visibility of the RGB in the pixel when the optical display device is driven by lowering the difference in visibility between the display area and the non-display area.

Background art of the present invention is disclosed in Korea Patent Publication No. 2015-0015243.

An object of the present invention is to provide a polarizing plate capable of minimizing the difference in visibility by increasing the uniformity between the display area and the non-display area at the interface between the display area and the non-display area when the display device is driven.

Another object of the present invention is to provide a polarizing plate capable of minimizing recognition of light leakage by increasing uniformity between the display area and the non-display area at the interface between the display area and the non-display area when the display device is driven.

Still another object of the present invention is to provide a polarizing plate having excellent light blocking property and lowering the degree of RGB visibility in pixels or preventing RGB from being viewed when driven in an optical display device.

Polarizing plate of the present invention is a polarizing plate consisting of a display area and a non-display area surrounding the display area, the polarizing plate is a polarizer and an adhesive layer, a first polarizer protective film is sequentially laminated on one surface of the polarizer, the adhesive layer is A light blocking layer forming at least a portion of the non-display area in the adhesive layer, wherein the light blocking layer is formed with a plurality of print patterns spaced apart from each other, and the print pattern is formed on the first print pattern and the first print pattern. A second print pattern, wherein the second print pattern has a pattern shape different from that of the first print pattern, and the first print is a point where an interface between the display area and the non-display area contacts the first print pattern. B, the first print pattern indicates a point where the first print pattern immediately adjacent to the pattern is in contact with an interface between the display area and the non-display area. When c is the closest point from a and c is the closest point from b in the first printing pattern, d, the distance from the boundary surface of the display area and the non-display area to c and the display area and the non-display area The minimum value H of the distances from the interface to d may be 200 μm or less.

The optical display device of the present invention may include the polarizing plate of the present invention.

The present invention provides a polarizing plate capable of minimizing the difference in visibility by increasing the uniformity between the display area and the non-display area at the interface between the display area and the non-display area when driving the display device.

The present invention provides a polarizing plate capable of minimizing recognition of light leakage by increasing uniformity between the display area and the non-display area at the interface between the display area and the non-display area when the display device is driven.

The present invention provides a polarizing plate having excellent light blocking property and lowering the degree of RGB visibility in pixels or preventing RGB from being viewed when driven in an optical display device.

1 is a perspective view of a polarizing plate of an embodiment of the present invention.
2 is a cross-sectional view of a polarizing plate of an embodiment of the present invention.
3 is an enlarged view of a print pattern of a part of a light shielding layer.
4 is a cross-sectional view of a printed pattern of a part of the light shielding layer.
FIG. 5 is a partial cross-sectional view of a sample for evaluating whether RGB is visible in a pixel in Examples and Comparative Examples. FIG.

Hereinafter, exemplary embodiments 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. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.

In the present specification, "upper" and "lower" are defined based on the drawings, and according to a viewpoint, "upper" may be changed to "lower" and "lower" to "upper", and "on" or What is referred to as “on” may include not only the above but also intervening other structures in the middle. On the other hand, what is referred to as "directly on", "directly on" or "directly formed" or "formed directly in contact" means not intervening with other structures.

The polarizing plate of the present invention includes a display area and a non-display area surrounding the display area, wherein the polarizing plate is sequentially laminated with a polarizer and an adhesive layer and a first polarizer protective film on one surface of the polarizer, and the adhesive layer is in the adhesive layer. The light blocking layer forming at least a portion of the non-display area may be included. The polarizing plate of the present invention can reduce the thickness of the optical display device because the light shielding layer is impregnated in the adhesive layer.

In the polarizing plate of the present invention, the light shielding layer is formed with a plurality of printing patterns spaced apart from each other. The print pattern includes a first print pattern and a second print pattern formed on the first print pattern. Preferably, the second printing pattern is formed directly on the first printing pattern, so that the light shielding layer can be thinned with the effects of the present invention described below. The "directly formed" means that no other layer is interposed between the first print pattern and the second print pattern.

The first print pattern has a pattern shape different from that of the second print pattern. A point where the first print pattern is in contact with the interface between the display area and the non-display area is a, and a point where the first print pattern which is immediately adjacent to the first print pattern is in contact with the interface between the display area and the non-display area is b. When c is the closest point from a in the first print pattern and c is the closest point from b in the first print pattern, the distance from the boundary of the display area and the non-display area to c and the distance between the display area and the non-display area The minimum value of the distance from the interface to d is called H. H may be 200 μm or less, for example 0.1 μm to 200 μm, preferably 5 μm to 200 μm. In the above range, the light blocking effect is obtained and the uniformity between the display area and the non-display area is high so that the luminous difference is small and the RGB in the pixel may not be viewed.

When a point at which the interface between the display area and the non-display area is in contact with the first print pattern is a, and a point at the second print pattern closest to the boundary between the display area and the non-display area is called a ', between a and a'. The shortest distance ΔL may be 200 μm or less, preferably 0.1 μm to 200 μm, more preferably 10 μm to 200 μm. In the above range, the light blocking effect is obtained and the uniformity between the display area and the non-display area is high so that the luminous difference is small and the RGB in the pixel may not be viewed.

In one embodiment, the difference between the maximum long axis length of the first print pattern and the maximum long axis length of the second print pattern is 200 μm or less, preferably 0.1 μm to 200 μm, more preferably 10 μm to 200 μm. Can be. In the above range, the light blocking effect is obtained and the uniformity between the display area and the non-display area is high so that the luminous difference is small and the RGB in the pixel may not be viewed. The "maximum long axis length" means the maximum length of a line connecting two arbitrary points constituting the pattern in each of the first and second print patterns.

The difference between the shortest distance ΔL and the long axis length may be the same or different.

Hereinafter, referring to FIGS. 1 and 2, a polarizer according to an exemplary embodiment of the present invention will be described in detail. 1 is a perspective view of a polarizing plate of an embodiment of the present invention, Figure 2 is a cross-sectional view of the polarizing plate of an embodiment of the present invention.

Referring to FIGS. 1 and 2, the polarizer 10 may include the polarizer 100 and the first polarizer protective film 200 and the polarizer 100 stacked on one surface of the polarizer 100 via an adhesive layer 310. It may include a second polarizer protective film 400 laminated on one surface. The light blocking layer 320 is formed in the adhesive layer 310.

Although not shown in FIGS. 1 and 2, an adhesive layer may be further formed on the lower surface of the second polarizer protective film 400. Although not shown in FIGS. 1 and 2, a functional layer may be further formed on the upper surface of the first polarizer protective film 200. Functional coatings provide additional functionality to polarizers, such as anti-finger, low reflection, anti-glare, anti-contamination, anti-reflection, It may provide one or more of the functions of diffusion and refraction. Controlling the haze of the functional coating layer can use methods known to those skilled in the art.

The polarizer 10 may be a polarizer disposed on the viewer side of the optical display device. Therefore, the adhesive layer 310 and the first polarizer protective film 200 are sequentially formed on the light exit surface of the polarizer 100.

Referring to FIG. 2, the polarizer 10 may include a display area S1; And a non-display area S2 surrounding the edge of the display area S1 and corresponding to the light blocking layer 320 of FIG. 1. The display area S1 is a light transmissive area, and the non-display area S2 is a light non-transmissive area.

The light blocking layer 320 is formed on at least one surface of the adhesive layer 310 in the adhesive layer 310. Preferably, the light blocking layer 320 is formed in direct contact with the adhesive layer 310.

As illustrated in FIGS. 1 and 2, the light blocking layer 320 is formed to surround the edge of the adhesive layer 310. The light blocking layer 320 is not formed as a separate layer from the adhesive layer 310, so that the optical display device can be thinned. The light blocking layer 320 forms at least a portion of the non-display area when the polarizing plate of the present invention is mounted on the optical display device.

The light blocking layer 320 is formed on the light exit surface of the polarizer 100. Therefore, the display function may be implemented in a portion of the polarizing plate in which the light blocking layer 320 is not formed. However, the case in which the light blocking layer 320 is formed on the light incident surface of the polarizer 100 may also be included in the scope of the present invention.

The thickness of the light blocking layer 320 may be smaller than or equal to the thickness of the adhesive layer 310.

1 illustrates a case in which the light blocking layer 320 has the same thickness as that of the adhesive layer 310. 2 illustrates a case in which the light blocking layer 320 has a smaller thickness than the adhesive layer 310. The thickness of the light blocking layer 320 may be 50% to 100% of the thickness of the adhesive layer 310. In the above range, it can be included in the adhesive layer, it is possible to thin the polarizing plate. For example, the thickness of the light blocking layer 320 may be 0.1 μm to 4 μm, preferably 1.0 μm to 4.0 μm. In the above range, it can be included in the adhesive layer, it is possible to ensure the light-shielding properties, it is possible to thin the polarizing plate.

The light shielding layer 320 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is an enlarged view of a print pattern in a light blocking layer at an interface between the display area S1 and the non-display area S2 of the polarizing plate of FIG. 2. FIG. 4 is a cross-sectional view of the printed pattern of the light blocking layer at an interface between the display area S1 and the non-display area S2 of the polarizing plate of FIG. 2.

3 and 4, the light blocking layer 320 may include a print area composed of a plurality of print patterns 323. The remaining area 324 of the light blocking layer 320 except for the print area corresponds to an unprinted area. The print patterns 323 are spaced apart from each other. The print pattern 323 includes a first print pattern 321 and a second print pattern 322 formed on the first print pattern 321. The second print pattern 322 may be formed directly on the first print pattern 321. The second print pattern 322 has a different pattern from that of the first print pattern 321. Preferably, the second print pattern 322 has a smaller area than the first print pattern 321.

The shortest distance ΔL may be 200 μm or less, preferably 0.1 μm to 200 μm, more preferably 10 μm to 200 μm. In the above range, the light shielding effect can be obtained and the uniformity between the display area and the non-display area is high, so that the luminous difference is small and the RGB in the pixel may not be viewed. In particular, the present invention stacks two printed patterns in multiple layers as shown in FIGS. 3 and 4, but instead of simply increasing the light blocking effect, the light shielding effect is obtained by adjusting the shortest distance ΔL, while the display area and the non-display area are obtained. The high uniformity means that there is little difference in visibility and the RGB in the pixels is not visible.

In one embodiment, the difference between the maximum long axis 321L of the first print pattern 321 and the maximum long axis 322L of the second print pattern 322 is 200 μm or less, preferably 0.1 μm to 200 μm, More preferably, it may be 10 micrometers to 200 micrometers. In the above range, the light shielding effect can be obtained and the uniformity between the display area and the non-display area is high, so that there is little difference in visibility and RGB in the pixel may not be viewed. Particularly, in the present invention, two printing patterns are stacked in multiple layers as shown in FIGS. 3 and 4, but the length of the above-mentioned long axis is the same, thereby deviating from simply increasing the light blocking effect, and controlling the difference in length between the printing patterns. In addition, the uniformity between the display area and the non-display area is high, so that there is little difference in visibility and RGB of the pixel is not viewed. The maximum long axis 321L of the first print pattern 321 has a length of 50 μm to 600 μm, preferably 100 μm to 500 μm, and the maximum long axis 322L of the second print pattern 322 has a length of 50 μm to 500 μm. Μm, preferably from 50 μm to 350 μm.

In addition, since the first and second print patterns 321 and 322 have different shapes, the print pattern 323 prints the first print pattern 321 and then prints the second print pattern 322. There is no choice but to form. Although the first print pattern and the second print pattern may be simultaneously formed in one mold, mold processing is not easy and the shape of the pattern may not be easily obtained. The print pattern should be printed in parallel, but when the second print pattern 322 is formed on the first print pattern 321, the curved surface may appear. According to the present invention, even when there is a curved surface between the first print pattern 321 and the second print pattern 322, the uniformity between the display area and the non-display area is high so that the visual difference is small and the RGB of the pixel is not viewed. The length difference and shortest distance ΔL between the long axis 321L of the first print pattern 321 and the long axis 322L of the second print pattern 322 is 200 µm or less, preferably 0.1 µm to 200 µm, more preferably. Preferably it was 10 micrometers-200 micrometers.

Referring to FIG. 3, the first print pattern 321 may have a hexagonal shape, and the second print pattern 322 may have a rhombus shape. However, the present invention is not limited thereto. For example, the first printing pattern may be an N-angle (N is an integer of 3 to 10), such as an octagonal shape, a circle, an ellipse, an amorphous shape, and the like. The second printing pattern may be an N-angle (eg, an octagonal shape). Integers from 3 to 10), circular, elliptical, amorphous, and the like. The length of one side constituting the first printing pattern 321 may be the same or different, respectively, may be 10㎛ to 400㎛, preferably 50㎛ to 300㎛. The length of one side constituting the second print pattern 322 may be the same or different, respectively, may be 10㎛ to 400㎛, preferably 50㎛ to 300㎛.

In one embodiment, the length of one side constituting the first print pattern 321 may be the same or different than the length of one side constituting the second print pattern 322. Preferably, the length of one side constituting the first print pattern 321 may be equal to the length of one side constituting the second print pattern 322.

In one embodiment, the first print pattern 321 may be a regular hexagon, the first print pattern 321 may be arranged in a honeycomb structure, the second print pattern 322 may be a rhombus or square.

The area of the second print pattern 322 may be smaller than the area of the first print pattern 321. Only then, the second print pattern 322 may be formed on the first print pattern 321. Preferably, the area ratio of the area of the first print pattern 321 to the area of the second print pattern 322 may be greater than 1, preferably greater than 100% and less than or equal to 3000%. In the above range, the uniformity between the display area and the non-display area is high, so there is little difference in visibility and RGB in the pixel may not be viewed.

Preferably, the intersection of the first print pattern 321 and the second print pattern 322 may be at least two, preferably three or more. In this case, since the uniformity between the display area and the non-display area is high, there is little difference in visibility and RGB of the pixel may not be viewed.

See FIG. 3. The point where the first print pattern 321 is in contact with the boundary between the display area S1 and the non-display area S2 is a, and the first print pattern 321 immediately adjacent to the first print pattern 321 is the display area ( When the point of contact between the interface between S1) and the non-display area S2 is b, the distance between a and b is W. When c is the closest point from a in the first print pattern 321 and c is the closest point from b in the first print pattern 321 from the boundary between the display area S1 and the non-display area S2. The minimum value of the distance to c and the distance from the boundary surface of display area S1 and non-display area S2 to d is called H. H may be 200 μm or less, for example 0.1 μm to 200 μm, preferably 5 μm to 200 μm. In the above range, the light blocking effect is obtained and the uniformity between the display area and the non-display area is high, so that there is little difference in visibility and RGB in the pixel may not be viewed.

In one embodiment, the printing pattern may satisfy the relationship of Formula 1:

<Equation 1>

0.1 x W ≤ H ≤ 0.5 x W

In Equation 1, uniformity becomes a problem at the interface in the first printing pattern immediately adjacent from the interface between the display area and the non-display area, to ensure uniformity at the interface. W may be 10 µm to 500 µm, preferably 10 µm to 490 µm, and 10 µm to 480 µm. W> H.

Preferably, the first print pattern is a regular hexagon, the first print pattern is arranged in a honeycomb structure, the second print pattern may be a rhombus or a square or a regular hexagon.

The print patterns 323 are spaced apart from each other. The separation distance T between the print patterns 323 may be 1 μm to 50 μm, preferably 5 μm to 30 μm. In the above range, it may have a light shielding effect, and may not affect the uniformity.

The light blocking layer 320 may be in a state in which some space is opened between the polarizer 100 and the first polarizer protective film 200. That is, the light blocking layer 320 may have a shape of a closed curve and may include a portion of an empty area therein. Therefore, the inside of the light blocking layer 320 described above may be defined as an empty space inside the light blocking layer 320 forming a closed curve. The light blocking layer 320 may be disposed on at least part or all of the outer edge on the horizontal cross section of the polarizer 100 and the first polarizer protective film 200. However, the present invention is not limited thereto.

The light shielding layer 320 may include the composition for the light shielding layer to be described in detail below to impart adhesion to the first polarizer protective film 200, thereby laminating the polarizer 100 and the first polarizer protective film 200. Therefore, even if there is no adhesive layer 310 between the polarizer 100 and the light blocking layer 320 and the first polarizer protective film 200 and the light blocking layer 320, the polarizer 100 and the first polarizer protective film 200 ) Can be laminated.

The light blocking layer 320 may block or absorb light, and may include a specific pattern such as a logo of a company or a dot pattern. That is, the user may include a shape desired by the light blocking layer 320 to impart an aesthetic sense to the user of the display device.

The light blocking layer 320 may be formed of a light blocking layer composition including a pigment, a binder resin, and an initiator. The light shielding layer composition may further include a reactive unsaturated compound.

By including the above components, the light blocking layer 320 may form a light blocking layer 320 having a thinner thickness and secure a difference in reflectance of the present invention. The light shielding layer-forming composition may further include a solvent.

The pigment may be a carbon black, a mixed pigment of silver-tin containing alloy or a combination thereof. Examples of the carbon black include graphitized carbon, furnace black, acetylene black, ketjen black, and the like, but are not limited thereto. Pigments may be included as, but are not limited to, pigment dispersions.

The binder resin may include an acrylic resin, a polyimide resin, a polyurethane resin, or a combination thereof. As the acrylic resin, methacrylic acid / benzyl methacrylate copolymer, methacrylic acid / benzyl methacrylate / styrene copolymer, methacrylic acid / benzyl methacrylate / 2-hydroxyethyl methacrylate copolymer, meta A methacrylic acid / benzyl methacrylate / styrene / 2-hydroxyethyl methacrylate copolymer etc. are mentioned. The polyurethane resin may be an aliphatic polyurethane resin. The acrylic resin may be an acrylic pressure-sensitive adhesive resin. However, the present invention is not limited thereto.

The reactive unsaturated compound may be a compound having a lower weight average molecular weight than the binder resin, and may include at least one of a photocurable unsaturated compound and a thermosetting unsaturated compound. Reactive unsaturated compounds include ethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, 1 , 6-hexanediol dimethacrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylic Latex, @bisphenol A epoxy (meth) acrylate, ethylene glycol monomethyl ether (meth) acrylate, trimethylolpropane tri (meth) acrylate, tris (meth) acryloyloxyethyl phosphate, and the like. It is not.

The initiator may comprise one or more of a photopolymerization initiator and a thermosetting initiator.

Examples of the photopolymerization initiator include, but are not limited to, acetophenone compounds, benzophenone compounds, thioxanthone compounds, benzoin compounds, triazine compounds, and morpholine compounds.

As the thermosetting initiator, for example, 1,3-bis (hydrazinocarbonoethyl-5-isopropylhydantoin) as a hydrazide compound, dicyandiamide, guanidine derivative, 1-cyanoethyl-2 as an imidazole derivative -Phenylimidazole, N- [2- (2-methyl-1-imidazolyl) ethyl] urea, 2,4-diamino-6- [2'-methylimidazolyl- (1 ')]- Ethyl-s-triazine, N, N'-bis (2-methyl-1-imidazolylethyl) urea, N, N '-(2-methyl-1-imidazolylethyl) -adipoamide, 2 -Phenyl-4-methyl-5-hydroxymethylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, modified aliphatic polyamines, tetrahydrophthalic anhydride and ethylene glycol-bis (an Hydrotrimellitate)).

As a solvent, Glycol ethers, such as ethylene glycol methyl ether, ethylene glycol ethyl ether, and propylene glycol methyl ether; Cellosolve acetates such as methyl cellosolve acetate, ethyl cellosolve acetate and diethyl cellosolve acetate; Carbitols such as methyl ethyl carbitol, diethyl carbitol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol methylethyl ether and diethylene glycol diethyl ether; Propylene glycol alkyl ether acetates such as propylene glycol methyl ether acetate and propylene glycol propyl ether acetate; Etc., but is not limited thereto.

In one embodiment, the composition for the light shielding layer 320 may include 1 to 50% by weight of the pigment (or pigment dispersion), 0.5 to 20% by weight of the binder resin, 0.1 to 10% by weight of the initiator and the balance of the solvent. have. While forming the thin shading layer 320 in the above range, it can exhibit an excellent shading effect.

In another embodiment, the composition for the light shielding layer 320 includes 1 to 50% by weight of a pigment (or pigment dispersion), 0.5 to 20% by weight of a binder resin, 1 to 20% by weight of a reactive unsaturated compound, and 0.1 to 10 of an initiator. Wt% and balance of the solvent. While forming the thin shading layer 320 in the above range, it can exhibit an excellent shading effect.

The composition for the light shielding layer 320 may include other additives of about 0.1 to 1% by weight in addition to the above components, and the other additives may include a silane coupling agent, and the like. Can help with UV curing.

The adhesive layer 310 may be interposed between the polarizer 100 and the first polarizer protective film 200 to bond the polarizer 100 and the first polarizer protective film 200 to each other. The adhesive layer 310 is formed directly on each of the polarizer 100 and the first polarizer protective film 200.

The adhesive layer 310 may be formed on at least one surface of each of the polarizer 100 and the first polarizer protective film 200. That is, the polarizer 100 and the first polarizer protective film 200 face each other, and they may have substantially the same area on a horizontal cross section. That is, they may completely overlap each other on a horizontal cross section, and in the case of the adhesive layer 310, they may be formed only on a part thereof, and more specifically, the adhesive layer 310 may include the polarizer 100 and the first polarizer protective film 200. Only the center except for the edge of the island shape may be arranged.

The adhesive layer 310 may be formed in direct contact with the light blocking layer 320 to allow the light blocking layer 320 to be stably formed in the polarizing plate 10.

The adhesive layer 310 may bond or laminate the polarizer 100 and the first polarizer protective film 200 to each other, and may include an aqueous adhesive or an ultraviolet curable adhesive. The water-based adhesive may include at least one selected from the group consisting of polyvinyl alcohol-based resins and vinyl acetate-based resins, or may include, but is not limited to, polyvinyl alcohol-based resins having a hydroxyl group. The ultraviolet curable adhesive may be acrylic, urethane-acrylic, or epoxy. However, the present invention is not limited thereto.

When the adhesive layer 310 is formed of an aqueous adhesive, the thickness of the adhesive layer 310 may be 0.1 μm to 4 μm, and when the adhesive layer 310 is formed of an ultraviolet curable adhesive, the thickness of the adhesive layer 310 may be 2 μm to 4 μm. have. Within this range, a gap between the polarizer 100 and the first polarizer protective film 200 by the light shielding layer 320 of the present invention may be filled, thereby improving durability of the polarizing plate. That is, the deviation between the region where the light blocking layer 320 is present and the region that does not exist between the polarizer 100 and the first polarizer protective film 200 may be minimized.

The first polarizer protective film 200 may be formed on one surface of the adhesive layer 310 to support the adhesive layer 310 and the polarizer 100.

The first polarizer protective film 200 may be an optically transparent protective film. For example, the first polarizer protective film may include polyester, acrylic, cyclic olefin polymer (COP), triacetyl, including polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and the like. Cellulose esters including polycellulose (TAC) and the like, polyvinylacetate, polyvinylchloride (PVC), polynorbornene, polycarbonate (PC), polyamide, polyacetal, polyphenylene ether, polyphenylene sulfide, poly Film formed from one or more of sulfone, polyethersulfone, polyarylate, polyimide.

In one embodiment, the first polarizer protective film may include a polyester-based material, and in an exemplary embodiment, in view of the polyester exhibiting crystallinity, an aromatic polyester may be used, for example, polyethylene Although terephthalate (PET) type | system | group, a polyethylene naphthalate (PEN) type, or the copolymer containing these is mentioned, It is not limited to these. The first polarizer protective film may be a triple coextrusion structure including a polyethylene terephthalate-based, polyethylene naphthalate-based, or a copolymer resin including the same. The polyester film can be obtained, for example, by a method of melt extruding the polyester resin in the form of a film and cooling and solidifying with a casting drum to form a film. Meanwhile, the first polarizer protective film 200 is well known in the art, and thus a detailed description thereof will be omitted.

The first polarizer protective film 200 may have a thickness of 30 μm to 120 μm, specifically 20 μm to 80 μm. It can be used in the optical display device in the above range.

The first polarizer protective film 200 may be an isotropic film or a retardation film. An isotropic film has an in-plane retardation Re (Re = (nx-ny) xd, nx, ny at a wavelength of 550 nm, and a refractive index in the slow and fast axis directions of the protective film and d is the thickness of the film, respectively) at a wavelength of 500 nm. Film may be included. The retardation film may include a film having an in-plane retardation Re greater than 5 nm, for example, 10 nm to 15,000 nm at a wavelength of 550 nm.

The second polarizer protective film 400 may have the same or different material, thickness, phase difference, or the like as the first polarizer protective film 200 described above.

The polarizer 100 may be formed on the lower surface of the adhesive layer 310 to polarize incident light.

The polarizer 100 may include a polarizer. The polarizer can include conventional polarizers known to those skilled in the art. Specifically, the polarizer may include a polyvinyl alcohol polarizer manufactured by uniaxially stretching the polyvinyl alcohol film, or a polyene polarizer manufactured by dehydrating the polyvinyl alcohol film. The polarizer 100 may have a thickness of about 5 μm to about 40 μm. Within this range, it can be used for an optical display device.

According to the present invention, an optical display device including the polarizing plate described above can be provided. The optical display device may include a light emitting display device including a liquid crystal display device, an organic light emitting display device, and the like. The polarizing plate of the present invention may be disposed on the viewer-side polarizing plate of the liquid crystal display device.

Hereinafter, the polarizing plate of the present invention will be described in more detail with reference to Examples and Comparative Examples.

Production Example  1 lesson Production Example  2

(A) A black pigment was used as a pigment dispersion containing 30 wt% of the pigment, and (A-1) a pigment dispersion containing a silver-tin alloy (Sumitomo Osaka Cement, TMP-DC-1) (pigment solid content 30 %, Silver and tin weight ratio = 7: 3) and (A-2) Pigment dispersion liquid containing carbon black (Sakata, CI-M-050) was used by mixing as shown in Table 1 below. (B-1) As binder resin, (B-1) SUTI-1000 manufactured by Shin ArtenC Co., Ltd. of aliphatic polyurethane type was used, and (B-2) acrylic pressure-sensitive adhesive resin (WA-9263, manufactured by Wooin Chemtech) was used. It was. (C) Melamine curing agent (manufactured by Wooin Chemtech, M60) as a reactive unsaturated compound, as an IGR 369 or (D-2) thermosetting initiator as dipentaerythritol hexaacrylate of Hannongsung Co., (D-1) as a photoinitiator. (E) Propylene glycol methyl ether acetate was used as the solvent, and Tego 765W was used as the (F) silane coupling agent.

The content of the pigment dispersion, the binder resin, the reactive unsaturated compound, the initiator, the solvent, and the silane coupling agent was adjusted as shown in Table 1 to prepare a light shielding layer composition.

A
(weight%) B-1
(weight%) B-2
(weight%) C
(weight%) D-1
(weight%) D-2
(weight%) E
(weight%) F
(weight%) A-1 A-2 Preparation Example 1 25 20 8 - 3 3 - 40 One Preparation Example 2 25 20 8 3 - - 3 40 One

Example  One

On the edge of one side of the polyethylene terephthalate (PET) film was coated with the composition for light-shielding layer of Preparation Example 1 with a gravure coating to form a first printing pattern. The printing rolls are regular hexagons in a first printing pattern, which are spaced apart from each other and have a honeycomb structure of honeycomb shape. The first printed pattern is a regular hexagon having a length of 50 µm on one side. After printing the first print pattern, another print roll was used to form the second print pattern. The said printing roll is a rhombus with a 2nd printing pattern, and the length of one side is 50 micrometers. In this case, the second print pattern was formed on the first print pattern, and the long axes of the first print pattern and the second print pattern were parallel to each other. Finally, the light shielding layer having the structure of FIGS. 3 and 4 was formed. The solvent was removed at 85 ° C. for 1 minute, and then exposed to a 650mJ light amount using a metal halide exposure machine to cure to form a light shielding layer (thickness: 3 μm).

The polyvinyl alcohol film (thickness: 60 micrometers, polymerization degree: 2400, saponification degree: 99.0%, VF-PS6000, Kuraray Co., Ltd.) was swelled in 25 degreeC aqueous solution, and it extended | stretched while dyeing in the 30 degreeC iodine ion containing dyeing tank. . The dyed polyvinyl alcohol film was further stretched in an aqueous solution of 55 ° C. boric acid so that the final stretching ratio was 6 times. The obtained polyvinyl alcohol film was dried in a 50 ° C. chamber for 3 minutes to prepare a polarizer (thickness: 12 μm).

Cycloolefin polymer film (ZB12-052125, Zeon Co., Ltd.), adhesive layer (OS-207, Soken) as the adhesive layer, the polarizer, the adhesive layer, and the second polarizer protective film on the surface of the PET film with the light shielding layer formed thereon ) Was sequentially laminated to prepare a polarizing plate.

Example  2 to Example  3

A polarizing plate was manufactured in the same manner as in Example 1, except that the first and second printing patterns were changed as shown in Table 2 below.

Example  4

A polarizing plate was prepared in the same manner as in Example 1 except that the composition of Preparation Example 2 was used instead of the composition of Preparation Example 1 and the curing method was thermally cured at 85 ° C. for 2 minutes.

Example  5

A polarizing plate was manufactured in the same manner as in Example 4, except that the first and second printing patterns were changed as shown in Table 2 below.

Comparative example  1 to Comparative example  2

A polarizing plate was manufactured in the same manner as in Example 1, except that the first and second printing patterns were changed as shown in Table 2 below.

Table 2 below was evaluated for the prepared polarizing plate.

(1) Light-shielding property: The light-shielding layer in the polarizing plate obtained by the said Example and the comparative example was measured using the UV filter using the optical density meter (TD-904: Gretag Macbeth Co., Ltd.) based on JISK7651: 1988. Evaluation in the light shielding layer in Table 2 was determined by the absorbance value at a wavelength of 550nm of the UV-visible spectrophotometer (JASC0-750). (Circle) has an absorbance value of 2.0 or more, (circle) is more than 1.5 and less than 2.0, (triangle | delta) is more than 1.0 and 1.5 or less, and X has a value of 1.0 or less.

(2) RGB visibility at pixel: FIG. 5 is a partial cross-sectional view of a specimen for evaluating RGB visibility. Referring to FIG. 5, the light source side polarizer 50 is attached to one surface of the liquid crystal cell 20 including the display area S1 and the non-display area S2. The light source side polarizing plate 50 was produced by adhering a triacetyl cellulose film to each of both surfaces of the polarizer prepared in Example.

On the other side of the liquid crystal cell 20, the polarizing plate 60 having the light shielding layer 320 prepared in Examples and Comparative Examples was attached to the viewing side polarizing plate. The dummy chip 40 and the metal wiring 30 are formed in the non-display area S2 of the viewing side of the liquid crystal cell 20. Specimens were manufactured by partially shielding the light shielding layer 320 from the dummy chip 40.

The specimen was driven and visually evaluated for RGB visibility. When RGB is not visually recognized and no visual difference is detected between the display area and the non-display area, it is evaluated as 'good'. When RGB is visually recognized and the visual difference between the display area and the non-display area is felt, it is evaluated as 'bad'.

Example Comparative example One 2 3 4 5 One 2 First print pattern shape Regular hexagon Regular hexagon Regular hexagon Regular hexagon Regular hexagon Regular hexagon Regular hexagon Length of one side (㎛) 50 170 230 50 170 240 400 Long axis length (㎛) 100 340 460 100 340 480 800 Second Print Pattern shape rhombus rhombus rhombus rhombus rhombus rhombus rhombus Length of one side (㎛) 50 170 230 50 170 240 400 Long axis length (㎛) 71 240 325 71 240 339 566 Shading Layer Composition Preparation Example 1 Preparation Example 1 Preparation Example 1 Preparation Example 2 Preparation Example 2 Preparation Example 1 Preparation Example 1 ΔL (μm) 29 100 135 29 100 141 234 H (μm) 43 147 199 43 147 208 346 Difference between major axis lengths (μm) 29 100 135 29 100 141 234 W (μm) 102 345 467 102 345 488 813 Shading ◎ ○ △ ◎ ○ △ X RGB visibility in pixels Good Good Good Good Good Bad Bad

As shown in Table 2, the polarizing plate of the present invention has excellent light shielding properties and minimizes the difference in visibility by increasing the uniformity between the display area and the non-display area at the interface between the display area and the non-display area when the display device is driven. Did.

On the other hand, in Comparative Example 1 in which H is larger than 200 µm, RGB is recognized in the pixel due to a significant difference in visibility between the display and non-display regions at the interface between the display and non-display regions when the display device is driven, and H is greater than 200 µm. In Comparative Example 2, the light blocking property was not good, and when the display device was driven, RGB was recognized by the pixel due to a large luminous difference between the display area and the non-display area at the interface between the display area and the non-display area.

The embodiments described above are all exemplary and different embodiments may be applied in combination.

Claims (14)

A polarizing plate comprising a display area and a non-display area surrounding the display area,
The polarizing plate may include a polarizer, and an adhesive layer and a first polarizer protective film sequentially stacked on one surface of the polarizer, and the adhesive layer may include a light blocking layer forming at least a portion of the non-display area in the adhesive layer.
The light blocking layer is formed with a plurality of printed patterns spaced apart from each other,
The print pattern includes a first print pattern and a second print pattern formed on the first print pattern, wherein the second print pattern has a pattern shape different from that of the first print pattern,
A point where the interface between the display area and the non-display area is in contact with the first print pattern, and a point where the first print pattern which is immediately adjacent to the first print pattern is with the interface between the display area and the non-display area. b, when c is the closest point from a in the first print pattern, c is the closest point from b in the first print pattern, d, the distance from c to the boundary between the display area and the non-display area, and the The minimum value H of the distance from the boundary surface of a display area and the said non-display area to d is more than 0 micrometers and 200 micrometers or less.
The shortest distance ΔL between a and a 'is defined when the point of the second print pattern closest to the boundary between the display area and the non-display area is a'.
Polarizing plate which is more than 0 micrometer and 200 micrometers or less
The polarizing plate of claim 2, wherein ΔL is 0.1 μm to 200 μm.
The polarizing plate according to claim 1, wherein a difference between the maximum long axis length of the first print pattern and the maximum long axis length of the second print pattern is greater than 0 µm and 200 µm or less.
The polarizing plate of claim 1, wherein the light blocking layer is formed to contact one surface of the adhesive layer and surround an edge of the adhesive layer.
The polarizing plate of claim 1, wherein an area of the first print pattern is smaller than an area of the second print pattern.
The polarizing plate of Claim 1 which has a relationship of following formula 1, when the distance between a and b is W.
<Equation 1>
0.1 x W <H <0.5 x W.
The polarizing plate of claim 1, wherein the first printing pattern is a regular hexagon, the first printing pattern is arranged in a honeycomb structure, and the second printing pattern is a rhombus or a square.
The polarizing plate according to claim 1, wherein the light shielding layer is formed of a light shielding layer-forming composition containing a pigment, a binder resin, and an initiator.
The polarizing plate of claim 9, wherein the light shielding layer-forming composition further comprises a reactive unsaturated compound.
The polarizing plate according to claim 9, wherein the pigment comprises carbon black, a mixed pigment of silver-tin containing alloy, or a combination thereof.
The polarizing plate of claim 1, wherein the light blocking layer is formed in direct contact with one surface of the first polarizer protective film.
The polarizing plate of claim 1, wherein a second polarizer protective film and an adhesive layer are further sequentially formed on the other surface of the polarizer.
An optical display device comprising the polarizing plate of claim 1.

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