TWI665501B - Polarizing plate and optical display comprising the same - Google Patents

Abstract

Polarizing plate and optical display including the same. The polarizing plate is composed of a display area and a non-display area surrounding the display area, and the polarizing plate includes a polarizer and a first polarizer protective film formed on one surface of the polarizer through an adhesive layer. The adhesive layer includes a light shielding layer embedded in the adhesive layer to constitute at least a part of the non-display area. The light shielding layer includes a plurality of printed patterns separated from each other. Each of the plurality of printed patterns includes a first printed pattern and a second printed pattern, and the second printed pattern is formed on the first printed pattern and has a shape different from the first printed pattern.

Description

Polarizing plate and optical display including the same

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

Cross-reference to related applications

This application claims the benefit of Korean Patent Application No. 10-2017-0118065, filed in the Korean Intellectual Property Office on September 14, 2017, and the entire disclosure of the Korean application is incorporated herein by reference.

The optical display includes a display area and a non-display area. The display area is transparent and displays images viewed through the screen. The non-display area is provided along the periphery of the display area to surround the display area, and a printed circuit board, a driver chip, and the like are provided to display an image. The non-display area is shielded by the light shielding layer so as not to be seen by the user of the optical display. Generally, the light-shielding layer is formed by printing a composition for the light-shielding layer on a window or by attaching a separate printing tape to the cover window. These methods increase the thickness of the optical display.

On the other hand, since the display region does not include a light-shielding layer and the non-display region includes a light-shielding layer, a difference in visibility inevitably occurs at an interface between the display region and the non-display region. Specifically, the pattern formed on the light-shielding layer in the non-display area reduces the uniformity of the non-display area, so that the user can more easily recognize the local visibility difference. When light leaks occur while the optical display is operating, the difference in visibility becomes more severe. This difference in visibility is determined based on whether RGB (red, green, blue) in the pixels are viewed when the optical display is operating. Higher visibility differences result in higher visibility with respect to RGB. Therefore, there is a need for a polarizing plate that can reduce the amount of light in the pixels during the operation of an optical display by reducing the difference in visibility between the display area and the non-display area while improving the light shielding properties even when the pattern is formed on the light shielding layer RGB visibility.

The background art of the present invention is disclosed in Korean Patent Publication No. 2015-0015243 and the like.

An object of the present invention is to provide a polarizing plate which can reduce the light-shielding property by reducing the difference in visibility between a display area and a non-display area while improving the light-shielding property even when a pattern is formed on the light-shielding layer. Regarding the visibility of RGB in pixels, and providing an optical display including the polarizing plate.

One aspect of the present invention provides a polarizing plate, which is composed of a display area and a non-display area surrounding the display area, and includes: a polarizer; and a first formed on a surface of the polarizer through an adhesive layer. A polarizer protective film, the adhesive layer includes a light-shielding layer embedded therein to constitute at least a portion of the non-display area, wherein the light-shielding layer includes a plurality of printed patterns separated from each other, each of the plurality of printed patterns One includes a first printing pattern and a second printing pattern. The second printing pattern is formed on the first printing pattern and has a shape different from that of the first printing pattern, and when the display area and A point where an interface between the non-display area and the first printed pattern abuts is denoted as a point a, and the adjacent between the two first printed patterns and the display area and the non-display area is the point a. The point adjacent to the interface is denoted as point b, the vertex or inflection point closest to point a in the first printed pattern is denoted as point c, and the vertex or inflection point closest to point b in the first printed pattern Shown as point d, the distance from the interface between the display area and the non-display area to point c, and the distance from the interface between the display area and the non-display area to point d The minimum value of H may be 200 μm or less.

Another aspect of the present invention provides an optical display including the polarizing plate according to the present invention.

The present invention provides a polarizing plate that can improve the uniformity between the display area and the non-display area at the interface between the display area and the non-display area by improving the uniformity between the display area and the non-display area during the operation of an optical display. Visibility differences are minimized.

The present invention provides a polarizing plate, which can improve the uniformity between the display area and the non-display area by improving the uniformity between the display area and the non-display area during the operation of an optical display. Visibility at the interface regarding light leakage is minimized.

The present invention provides a polarizing plate which has good light-shielding properties and can reduce or prevent visibility with respect to RGB in a pixel during operation of an optical display.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings to provide a thorough understanding of the present invention to those having ordinary knowledge in the technical field. It should be understood that the present invention may be implemented in different ways and is not limited to the following examples. In the drawings, parts irrelevant to the description will be omitted for clarity. Throughout the description, the same components will be denoted by the same reference symbols.

Here, spatially relative terms such as "upper" and "lower" are defined with reference to the drawings. Therefore, it should be understood that the term "upper surface" is used interchangeably with the term "lower surface", and when an element such as a layer or film is referred to as "placed on another element", the element may be placed directly on another Intermediate elements may be present on the element. On the other hand, when an element is referred to as being "directly on" another element, there are no intervening elements between the elements.

The polarizing plate according to the present invention is composed of a display area and a non-display area surrounding the display area, and includes a polarizer and a first polarizer protective film formed on one surface of the polarizer via an adhesive layer, wherein The adhesive layer includes a light-shielding layer embedded therein to constitute at least a part of the non-display area. In the polarizing plate according to the present invention, the light shielding layer is embedded in the adhesive layer, so that the thickness of the optical display can be reduced.

In the polarizing plate according to the present invention, the light shielding layer includes a plurality of printed patterns separated from each other. Each of the plurality of printed patterns includes a first printed pattern and a second printed pattern formed on the first printed pattern. Preferably, the second printing pattern is directly formed on the first printing pattern, so that the thickness of the light shielding layer can be reduced, while providing the advantageous effects of the present invention described below. In this text, the expression "formed directly on" means that no intervening layer is interposed between the first printed pattern and the second printed pattern.

The first printed pattern has a different shape from the second printed pattern. The point where the first printed pattern is adjacent to the interface between the display area and the non-display area is represented as point a, and the point where two adjacent first printed patterns are adjacent to the interface between the display area and the non-display area is represented. Is point b. When the vertex or inflection point closest to point a in the first printed pattern is point c and the vertex or inflection point closest to point b in the first printed pattern is point d, from the interface between the display area and the non-display area to The minimum value of the distance between the point c and the distance from the interface between the display area and the non-display area to the point d is denoted as H. The minimum distance H may be 200 μm or less, for example, 0.1 μm to 200 μm, and preferably 5 μm to 200 μm. Within this range, the light-shielding layer can ensure the light-shielding effect and improve the uniformity between the display area and the non-display area, so as to suppress or reduce the visibility of RGB in the pixel while the optical display is operating, and reduce the display area And non-display areas.

When a point adjacent to the interface between the first printed pattern and the display region and the non-display region is denoted as point a and a point of the second printed pattern closest to the interface between the display region and the non-display region is denoted as point a ′, The shortest distance ΔL between points a and a 'may be 200 μm or less, preferably 0.1 μm to 200 μm, and more preferably 10 μm to 200 μm. Within this range, the light-shielding layer can ensure the light-shielding effect and improve the uniformity between the display area and the non-display area, so as to suppress or reduce the visibility of RGB in the pixel while the optical display is operating, and reduce the display area And non-display areas.

In one embodiment, the difference between the maximum major axis lengths of the first printed pattern and the second printed pattern may be 200 μm or less, preferably 0.1 μm to 200 μm, and more preferably 10 μm to 200 μm. Within this range, the light-shielding layer can ensure the light-shielding effect and improve the uniformity between the display area and the non-display area, so as to suppress or reduce the visibility of RGB in the pixel while the optical display is operating, and reduce the display area And non-display areas. The term "maximum major axis length" means the longest length of a line connecting two points constituting a corresponding printed pattern in each of the first printed pattern and the second printed pattern.

The shortest distance ΔL and the difference in the maximum long axis length may be the same or different from each other.

Next, a polarizing plate according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. 1 is a perspective view of a polarizing plate according to an embodiment and FIG. 2 is a cross-sectional view of a polarizing plate according to an embodiment of the present invention.

1 and 2, the polarizing plate 10 may include a polarizer 100, a first polarizer protective film 200 stacked on one surface of the polarizer 100 through an adhesive layer 310, and a first polarizer protective film 200 stacked on the other surface of the polarizer 100. Two polarizer protective film 400. The light shielding layer 320 is embedded in the adhesive layer 310.

Although not shown in FIGS. 1 and 2, the polarizing plate may further include an adhesive layer formed on a lower surface of the second polarizer protective film 400. Although not shown in FIGS. 1 and 2, the polarizing plate may further include a functional layer on the upper surface of the first polarizer protective film 200 to provide additional functions of the polarizing plate. The functional coating may provide at least one of anti-fingerprint, low-reflection, anti-glare, anti-pollution, anti-reflection, diffusion and reflection functions. The haze of the functional coating can be adjusted by methods known to those skilled in the art.

The polarizing plate 10 may be a polarizing plate provided on a viewer side of the optical display. 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 polarizing plate 10 is composed of a display area S1 and a non-display area S2. The non-display area S2 surrounds the periphery of the display area S1 and corresponds to the light shielding layer 320 shown in FIG. 1. The display area S1 is a light-transmitting area, and the non-display area S2 is an opaque area.

The light shielding layer 320 is formed on at least one surface of the adhesive layer 310 in the adhesive layer 310. The light shielding layer 320 is preferably directly adjacent to the adhesive layer 310.

1 and 2, the light shielding layer 320 is formed to surround the periphery of the adhesive layer 310. Since the light shielding layer 320 is not formed as a separate layer from the adhesive layer 310, compactness of the optical display can be achieved. When the polarizing plate according to the present invention is mounted on an optical display, the light shielding layer 320 constitutes at least a part of a non-display area.

The light-shielding layer 320 is formed on a light exit surface of the polarizer 100. Therefore, a display function can be implemented at a portion where the light shielding layer 320 is not formed in the polarizing plate. Alternatively, the light shielding layer 320 may be formed on a light incident surface of the polarizer 100.

The light-shielding layer 320 may have the same thickness or smaller than the thickness of the adhesive layer 310.

FIG. 1 shows that the light shielding layer 320 has the same thickness as the adhesive layer 310. FIG. 2 shows that the light shielding layer 320 has a smaller thickness than the adhesive layer 310. The thickness of the light shielding layer 320 may be 50% to 100% of the thickness of the adhesive layer 310. Within this thickness range, the light shielding layer 320 may be incorporated into the adhesive layer and a reduction in the thickness of the polarizing plate may be achieved. For example, the light shielding layer 320 may have a thickness of 0.1 μm to 4 μm, preferably 1.0 μm to 4.0 μm. Within this thickness range, the light shielding layer 320 can be incorporated into the adhesive layer to ensure light shielding and reduce the thickness of the polarizing plate.

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

Referring to FIGS. 3 and 4, the light-shielding layer 320 may include a printing area composed of a plurality of printing patterns 323. The remaining region 324 in the light-shielding layer 320 other than the printed region is a non-printed region. The printed patterns 323 are separated from each other. Each of the print patterns 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 directly formed on the first print pattern 321. The second printed pattern 322 may have a shape different from that of the first printed pattern 321. Preferably, the second printed pattern 322 has a smaller area than the first printed pattern 321.

The shortest distance ΔL may be 200 μm or less, preferably 0.1 μm to 200 μm, and more preferably 10 μm to 200 μm. Within this range, the light-shielding layer can ensure the light-shielding effect and the uniformity between the display area and the non-display area can be improved to suppress or reduce the visibility of RGB in pixels while the optical display is operating, while reducing the display Differences in visibility between areas and non-display areas. In particular, according to the present invention, two printed patterns are stacked in a double-layered structure while adjusting the shortest distance ΔL in the light-shielding layer, as shown in FIGS. 3 and 4, thereby improving between the display area and the non-display area. While ensuring the improvement of the shading effect to reduce the visibility difference between the display area and the non-display area and suppress or reduce the visibility of RGB in the pixel when the optical display is operating.

In one embodiment, the length difference between the maximum long axis 321L of the first printed pattern 321 and the maximum long axis 322L of the second printed pattern 322 may be 200 μm or less, preferably 0.1 μm to 200 μm, More preferably, it is 10 μm to 200 μm. Within this range, the light-shielding layer can ensure the light-shielding effect and the uniformity between the display area and the non-display area can be improved to suppress or reduce the visibility of RGB in pixels while the optical display is operating, while reducing the display Differences in visibility between areas and non-display areas. In particular, according to the present invention, two printed patterns having the same major axis length in the light-shielding layer are stacked in a two-layer structure while adjusting the length difference between the printed patterns in the light-shielding layer, as shown in FIGS. 3 and 4. This improves the uniformity between the display area and the non-display area while ensuring the improvement of the shading effect, so as to reduce the difference in visibility between the display area and the non-display area and suppress or reduce the RGB in pixels when the optical display is operating Visibility. The maximum long axis 321L of the first printed pattern 321 may have a length of 50 μm to 600 μm, preferably a length of 100 μm to 500 μm, and the maximum long axis 322L of the second printed pattern 322 may have a length of 50 μm to 500 μm. The length is preferably a length of 50 μm to 350 μm.

In addition, since the first print pattern 321 has a different shape from the second print pattern 322, the print pattern 323 can be formed by printing the first print pattern 321 and then printing the second print pattern 322 thereon. Although the first printing pattern and the second printing pattern can be formed simultaneously using a single mold, there are problems in that the mold processing is difficult and the shape of the pattern is not clear. Although it is desirable that the printed patterns are parallel to each other, when the second printed pattern 322 is formed on the first printed pattern 321, a circular surface is inevitably formed. According to the present invention, the length difference and the shortest distance ΔL between the maximum long axis 321L of the first printed pattern 321 and the maximum long axis 322L of the second printed pattern 322 are set to 200 μm or less, preferably 0.1 μm to 200 μm, more preferably 10 μm to 200 μm, to improve the uniformity between the display area and the non-display area, thereby suppressing or reducing the visibility of RGB in the pixel, while reducing the gap between the display area and the non-display area The difference in visibility is even when a circular surface is formed between the first printed pattern 321 and the second printed pattern 322.

Referring to FIG. 3, the first print pattern 321 may have a hexagonal shape, and the second print pattern 322 may have a diamond shape. However, it should be understood that the present invention is not limited thereto. For example, the first printing pattern may have an N-polygon shape (N is an integer from 3 to 10), a circular shape, an oval shape, an amorphous shape, and the like, and the second printing pattern may have N polygon shapes (N is an integer from 3 to 10), circular shapes, oval shapes, amorphous shapes, and the like. The sides constituting the first printed pattern 321 may have the same length or different lengths, and may have a length of 10 μm to 400 μm, and preferably a length of 50 μm to 300 μm. The sides constituting the second printed pattern 322 may have the same length or different lengths, and may have a length of 10 μm to 400 μm, and preferably a length of 50 μm to 300 μm.

In an embodiment, the sides of the first printed pattern 321 may have the same or different lengths as the sides of the second printed pattern 322. Preferably, the sides of the first printed pattern 321 have the same length as the sides of the second printed pattern 322.

In another embodiment, the first print pattern 321 may have a regular hexagon shape and may be arranged in a honeycomb shape, and the second print pattern 322 may have a diamond shape or a square shape.

The second printed pattern 322 may have a smaller area than the first printed pattern 321. With this structure, the second print pattern 322 can be formed on the first print pattern 321. Preferably, the ratio of the area of the first printed pattern 321 to the area of the second printed pattern 322 is greater than 1, preferably greater than 100% to 3,000%. Within this range, the uniformity between the display area and the non-display area can be improved, thereby suppressing or reducing the visibility of RGB in the pixels while the optical display is operating, and reducing between the display area and the non-display area. Difference in visibility.

Preferably, the boundary of the first printed pattern 321 and the boundary of the second printed pattern 322 abut at least two points, preferably at three or more points. With this structure, the polarizing plate can improve the uniformity between the display area and the non-display area, thereby suppressing or reducing the visibility of RGB in pixels while the optical display is operating, and reducing the display area and the non-display area. Difference in visibility.

Referring to FIG. 3, a point where the interface between the first printed pattern 321 and the display region S1 and the non-display region S2 is adjacent is denoted as point a, and two adjacent first print patterns 321 and the display region S1 and the non-display region S2 The point at which the interface is adjacent is denoted as point b, and the distance between point a and point b is denoted by W. In addition, the vertex or inflection point closest to the point a in the first printed pattern is point c, and the vertex or inflection point closest to the point b in the first printed pattern is point d. The minimum value of the distance from the interface of the interface to the point c and the distance from the interface between the display area S1 and the non-display area S2 to the point d is H. The minimum distance H may be 200 μm or less, for example, 0.1 μm to 200 μm, and preferably 5 μm to 200 μm. Within this range, the light-shielding layer can ensure the light-shielding effect and improve the uniformity between the display area and the non-display area, so as to suppress or reduce the visibility of RGB in the pixel while the optical display is operating, and reduce the display area And non-display areas.

In one embodiment, the printed pattern satisfies the following formula 1: [Formula 1] 0.1 × W ≤ H ≤ 0.5 × W

Formula 1 is set to ensure uniformity at the interface between the display area and the non-display area, and to ensure the uniformity of the first printed pattern directly adjacent to the interface between the display area and the non-display area. W can be from 10 μm to 500 μm, preferably from 10 μm to 490 μm, for example from 10 μm to 480 μm. For example, W may be greater than H (W> H).

Preferably, the first printed pattern has a regular hexagonal shape and is arranged in a honeycomb shape, and the second printed pattern has a rhombic, square, or regular hexagonal shape.

The printed patterns 323 are separated from each other. The interval T between the printed patterns 323 may be 1 μm to 50 μm, and preferably 5 μm to 30 μm. Within this range, the light shielding layer 320 may provide a light shielding effect without affecting uniformity.

The light shielding layer 320 may have a partially open space between the polarizer 100 and the first polarizer protective film 200. That is, the light shielding layer 320 may have a closed-loop shape and may include a partially empty internal space. Therefore, the “internal space” of the light-shielding layer 320 can be defined as an empty space inside the light-shielding layer 320, which forms a closed loop shape. In the horizontal cross-sectional view, the light shielding layer 320 may be disposed on a part or all of the outer periphery of each of the polarizer 100 and the first polarizer protective film 200. However, it should be understood that the present invention is not limited thereto.

The light-shielding layer 320 may include a composition for the light-shielding layer to impart bonding strength to the first polarizer protective film 200 so that the polarizer 100 can be attached to the first polarizer protective film 200 by this. Therefore, even in a structure where the adhesive layer 310 does not exist between the polarizer 100 and the light shielding layer 320 and between the first polarizer protective film 200 and the light shielding layer 320, the polarizer 100 can be attached to the first polarizer protective film. 200.

The light-shielding layer 320 may block or absorb light, and may include a company logo or a certain pattern, such as a dot pattern or the like. That is, the light-shielding layer 320 includes a desired pattern that is pleasing to a user of the optical display to provide an aesthetically pleasing appearance.

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

With these components, the light-shielding layer 320 can be formed to a thinner thickness while ensuring the reflectance difference of the present invention. The composition for the light-shielding layer may further include a solvent.

The pigment may include carbon black, a silver-tin alloy hybrid pigment, or a combination thereof. Examples of the carbon black may include, but are not limited to, graphite, furnace black, acetylene black, and Ketjen black. The pigment may exist in the form of a pigment dispersion, but is not limited thereto.

The binder resin may include an acrylic resin, a polyimide resin, a polyurethane resin, or a combination thereof. The acrylic resin may include methacrylic acid / benzyl methacrylate copolymer, methacrylic acid / benzyl methacrylate / styrene copolymer, methacrylic acid / benzyl methacrylate / 2-hydroxyethyl methacrylate copolymer Products, copolymers of methacrylic acid / benzyl methacrylate / styrene / 2-hydroxyethyl methacrylate and the like. The polyurethane resin may be an aliphatic polyurethane resin. The acrylic resin may be a pressure-sensitive adhesive resin. However, it should be understood that the present invention is not limited thereto.

The reactive unsaturated compound is a compound having a weight average molecular weight lower than that of the binder resin, and may include at least one of a photo-curable unsaturated compound and a thermosetting unsaturated compound. Examples of the reactive unsaturated compound may include ethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, 1 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, neopentaerythritol (meth) acrylate, neopentaerythritol (meth) acrylate, dineopent Tetraol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, bisphenol A epoxy (meth) acrylate, ethylene glycol monomethyl ether (meth) acrylate, trihydroxy Methylpropane ginseng (meth) acrylate and ginseng (meth) acryloxyethyl phosphate, but are not limited thereto.

The initiator may include at least one of a typical photopolymerization initiator and a thermosetting initiator.

Photopolymerization initiators may include acetophenone, benzophenone, thioxanthone, benzoin, triazine, and morpholine compounds, but not Limited to this.

The thermosetting initiator may include at least one selected from the group consisting of, for example: a hydrazine compound such as 1,3-bis (hydrazinocarbonylethyl-5-isopropylhydantoin); an imidazole derivative , Such as dicyandiamine, guanidine derivatives, 1-cyanoethyl-2-phenylimidazole, N- [2- (2-methyl-1-imidazolyl) ethyl] urea, 2,4-di Amino-6- [2'-methylimidazolyl- (1 ')]-ethyl-s-triazine, N, N'-bis (2-methyl-1-imidazolylethyl) urea, N , N '-(2-methyl-1-imidazolylethyl) -hexanediamine and 2-phenyl-4-methyl-5-hydroxymethylimidazole and 2-phenyl-4,5-di Hydroxymethylimidazole; and anhydrides, such as modified aliphatic polyamines, tetrahydrophthalic acid, and ethylene glycol bis (anhydrotrimellitic acid esters).

Solvents may include glycol ethers, such as glycol methyl ether, ethylene glycol ether, propylene glycol methyl ether, etc .; celex acetate, such as acesulfur acetate, ethelacet acetate, and diethylcelex acetate Carbitol, such as methyl ethyl carbitol, diethyl carbitol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol methyl ester Diethyl ether, diethylene glycol diethyl ether, and the like; and propylene glycol alkyl ether acetates, such as propylene glycol methyl ether acetate, propylene glycol propyl ether acetate, and the like, but are not limited thereto.

In an embodiment, the composition for the light-shielding layer 320 may include 1 wt% to 50 wt% pigment (or pigment dispersion), 0.5 wt% to 20 wt% binder resin, and 0.1 wt% to 10 wt. % Of initiator and balance of solvent. Within this range, the composition can ensure that the light-shielding layer 320 having a thin thickness is formed while providing a good light-shielding effect.

In one embodiment, the composition for the light-shielding layer 320 may include 1 wt% to 50 wt% pigment (or pigment dispersion), 0.5 wt% to 20 wt% binder resin, and 1 wt% to 20 wt. % Reactive unsaturated compound, 0.1 wt% to 10 wt% initiator and balance of solvent. Within this range, the composition can ensure that the light-shielding layer 320 having a thin thickness is formed while providing a good light-shielding effect.

The composition for the light shielding layer 320 may further include 0.1 wt% to 1 wt% of an additive. The additive may include a silane coupling agent to assist UV curing of the light-shielding layer 320.

The adhesive layer 310 is interposed between the polarizer 100 and the first polarizer protective film 200 to adhere the polarizer 100 to the first polarizer protective film 200. The adhesive layer 310 is directly formed 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 may face each other and have substantially the same area in a horizontal cross-sectional view. That is, the polarizer 100 and the protective film 200 may completely overlap each other in a horizontal cross-sectional view. Specifically, the adhesive layer 310 may be formed on at least a portion of the polarizer 100 and the first polarizer protective film 200. More specifically, the adhesive layer 310 may be provided in an island shape only at the center of the polarizer 100 and the first polarizer protective film 200 excluding the periphery of the polarizer 100 and the first polarizer protective film 200.

The adhesive layer 310 can be directly formed on the light shielding layer 320, so that the light shielding layer 320 can be stably disposed in the polarizing plate 10.

The adhesive layer 310 is used to join or couple the polarizer 100 and the first polarizer protective film 200 to each other, and may include a water-based adhesive or a UV-curable adhesive. The water-based adhesive may include at least one selected from the group consisting of a polyvinyl alcohol resin and a vinyl acetate resin, or may include a polyvinyl alcohol resin having a hydroxyl group, but is not limited thereto. The UV-curable adhesive may include, but is not limited to, acrylic, urethane-acrylic, and epoxy adhesives.

When the adhesive layer 310 is formed of a water-based adhesive, the adhesive layer 310 may have a thickness of 0.1 μm to 4 μm, and when the adhesive layer 310 is formed of a UV-curable adhesive, the adhesive layer 310 may have a thickness of 2 μm to 4 μm. thickness. When the thickness of the adhesive layer falls within this range, the gap generated between the polarizer 100 and the first polarizer protective film 200 due to the light shielding layer 320 may be filled with the adhesive layer, thereby improving the durability of the polarizing plate. That is, the adhesive layer 310 can minimize a deviation between a region where the light shielding layer 320 exists between the polarizer 100 and the first polarizer protective film 200 and a region where the light shielding layer 320 does not exist.

The first polarizer protective film 200 may be formed on a 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 be formed of at least one selected from the group consisting of polyester, such as polyethylene terephthalate (PET), polybutylene terephthalate, and polynaphthalate Ethylene glycol and polybutylene naphthalate, acrylic acid, cyclic olefin polymer (COP), cellulose esters, such as triethyl cellulose (TAC), polyvinyl acetate, polyvinyl chloride (PVC ), Polynorbornene, polycarbonate (PC), polyfluorene, polyacetal, polyphenylene ether, polyphenylene sulfide, polyfluorene, polyetherfluorene, polyarylate, and polyimide.

In one embodiment, the first polarizer protective film may include a polyester material. For example, the first polarizer protective film may be formed of an aromatic polyester material to ensure crystallinity. For example, the first polarizer protective film may be formed of, but is not limited to, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or a copolymer resin including the same. The first polarizer protective film may have a triple co-extrusion structure. The triple co-extrusion structure includes polyethylene terephthalate, polyethylene naphthalate, or a copolymer resin containing the same. . The polyester film can be formed by, for example, melt-extruding the polyester resin into a film shape, and then cooling the polyester resin on a casting drum. The first polarizer protective film 200 is well known in the art, and thus a detailed description thereof will be omitted herein.

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

The first polarizer protective film 200 may be an isotropic film or a retardation film. An isotropic film may have an in-plane retardation (Re) of 5 nm or less at a wavelength of 550 nm, as represented by Re = (nx-ny) × d, where nx and ny are in the protective film, respectively. The refractive index at the slow and fast axes at 500 nm, d is the thickness of the protective film. The retardation film may have an in-plane retardation (Re) greater than 5 nm at a wavelength of 550 nm, for example, 10 nm to 15,000 nm.

In terms of material, thickness, retardation, etc., the second polarizer protective film 400 may have the same or different characteristics as the first polarizer protective film 200.

A polarizer 100 is formed on the lower surface of the adhesive layer 310 to polarize incident light.

The polarizer 100 may include a polarizer. The polarizer may include a typical polarizer known to those having ordinary skill in the art. Specifically, the polarizer may include a polyvinyl alcohol-based polarizer obtained by uniaxially stretching a polyvinyl alcohol film, or a polyene-based polarizer obtained by dehydrating a polyvinyl alcohol film. The polarizer may have a thickness of about 5 µm to about 40 µm. Within this range, polarizers can be used in optical displays.

The present invention may provide an optical display including the polarizing plate according to the embodiment of the present invention described above. The optical display may include a liquid crystal display, a light emitting display including an organic light emitting diode display, and the like. The polarizing plate can be arranged on the viewer side of the liquid crystal display.

Next, the present invention will be described in more detail with reference to some examples. It should be noted, however, that these examples are provided for illustration only and should not be construed as limiting the invention in any way. Preparation Example 1 and Preparation Example 2

A black pigment was used as a pigment dispersion (A) containing 30 wt% pigment. Specifically, a pigment dispersion (A-1) containing a silver-tin alloy (TMP-DC-1, Sumitomo Oosaka Cement Co., Ltd.) (solid content: 30%, silver to tin weight ratio = 7: 3) and pigment dispersion (A-2) containing carbon black (CI-M-050, Sakata Co., Ltd.) are mixed in the amount ratios listed in Table 1. Aliphatic polyurethane (SUO-1000, Shina T & C Co., Ltd.) (B1) and acrylic pressure-sensitive adhesive resin (WA-9263, Wooin ChemTech Co., Ltd.) (B2) were used as adhesives Resin (B). Use dipentaerythritol hexaacrylate (Hanong Chemistry Co., Ltd.) as the reactive unsaturated compound (C); use IGR 369 as the photopolymerization initiator (D1) or use melamine curing agent (M60, Wooin ChemTech Co ., Ltd.) as the thermosetting initiator (D2); propylene glycol methyl ether acetate as the solvent (E); and a silane coupling agent (765W, Tego Co., Ltd.) as the silane coupling agent (F).

A composition for a light-shielding layer was prepared by mixing a pigment dispersion, a binder resin, a reactive unsaturated compound, an initiator, a solvent, and a silane coupling agent in the amounts listed in Table 1. Table 1 project A (wt%) B-1 (wt%) B-2 (wt%) C (wt%) D-1 (wt%) D-2 (wt%) E (wt%) F (wt%) A-1 A-2 Preparation Example 1 25 20 8 - 3 3 - 40 1 Preparation Example 2 25 20 8 3 - - 3 40 1 Example 1

A first printing pattern was formed along the periphery of one surface of a polyethylene terephthalate (PET) film through gravure coating of the composition for a light-shielding layer prepared in Preparation Example 1. A printing roller is formed on the first printing pattern in a pattern corresponding to the first printing pattern, having a regular hexagonal shape, and separated from each other to form a honeycomb structure. Each side of the first printed pattern having a regular hexagonal shape has a length of 50 μm. After the first printing pattern is printed, another printing roller is used to form a second printing pattern on the first printing pattern. The printing roller was formed with a pattern corresponding to the second printing pattern and having a rhombus shape, and the length of each side of the pattern was 50 μm. Pattern printing is performed so that the second printing pattern can be formed on the first printing pattern, and the long axis of the first printing pattern is parallel to the long axis of the second printing pattern. Finally, a light-shielding layer having a structure as shown in FIGS. 3 and 4 is formed. A light-shielding layer (thickness: 3 μm) was formed by removing the solvent at 85 ° C. for 1 minute and then exposing using a metal halide lamp at 650 mJ.

A polyvinyl alcohol film (thickness: 60 µm, degree of polymerization: 2,400, degree of saponification: 99.0%, VF-PS6000, Kuraray Co., Ltd., Japan) was swelled in an aqueous solution at 25 ° C, and then swelled at 30 ° C Dyeing and stretching in a dye bath containing iodine ions. Then, the dyed polyvinyl alcohol film was further stretched to 6 times its original length in a boric acid solution at 55 ° C. The obtained polyvinyl alcohol film was dried in a chamber at 50 ° C for 3 minutes, thereby preparing a polarizer (thickness: 12 µm).

An adhesive layer, a prepared polarizer, an adhesive layer, and a cycloolefin polymer film (ZB12-052125, Zeon Co. , Ltd.) and an adhesive layer (OS-207, Soken) to prepare a polarizing plate. Example 2 and Example 3

Each polarizing plate was prepared in the same manner as in Example 1 except that the first printing pattern and the second printing pattern were changed as listed in Table 2.

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 thermal curing was performed at 85 ° C for 2 minutes.

Example 5

A polarizing plate was prepared in the same manner as in Example 4 except that the first printing pattern and the second printing pattern were changed as listed in Table 2.

Comparative Example 1 and Comparative Example 2

Each polarizing plate was prepared in the same manner as in Example 1 except that the first printing pattern and the second printing pattern were changed as listed in Table 2.

For the following properties shown in Table 2, the polarizing plates prepared in the examples and comparative examples were evaluated.

(1) Light shielding: The light shielding was measured on the light-shielding layer of each polarizing plate prepared in the examples and comparative examples using a densitometer (TD-904: Gretag Macbeth Company) according to JIS K7651: 1988 through a UV filter. In Table 2, in the UV-visible spectrophotometer (JASC0-750), the light-shielding layer was evaluated based on the absorbance at a wavelength of 550 nm. An absorbance value of 2.0 or more was evaluated as ◎, an absorbance value of more than 1.5 to less than 2.0 was evaluated as ○, an absorbance value of more than 1.0 to 1.5 was evaluated as Δ, and an absorbance value of 1.0 or less was evaluated as X.

(2) Regarding the visibility of RGB in a pixel: FIG. 5 is a cross-sectional view of a sample for evaluating whether RGB in a pixel can be observed. Referring to FIG. 5, a light source-side polarizing plate 50 is attached to one side of a liquid crystal cell 20 composed of a display area S1 and a non-display area S2. The light source side polarizing plate 50 was manufactured by adhering a triethylammonium cellulose film to both surfaces of each polarizer prepared in the example.

As a viewer-side polarizing plate, a polarizing plate 60 (including a light-shielding layer 320 prepared in each example and a comparative example) is adhered to the other surface of the liquid crystal cell 20. In the non-display area S2 of the viewer-side surface of the liquid crystal cell 20, a dummy wafer 40 and a metal interconnect 30 are formed. The sample is prepared by the light-shielding layer 320 formed to partially overlap the dummy wafer 40.

Visually evaluate RGB visibility by running each sample. If RGB is not observed and the difference in visibility between the display area and the non-display area is not recognized, the sample is rated as "good" and if RGB is observed and the difference in visibility between the display area and the non-display area is recognized, The sample is rated as "poor". Table 2 project Examples Comparative example 1 2 3 4 5 1 2 First printed pattern shape hexagon hexagon hexagon hexagon hexagon hexagon hexagon Length of one side (μm) 50 170 230 50 170 240 400 Long axis length (μm) 100 340 460 100 340 480 800 Second printed pattern shape diamond diamond diamond diamond diamond diamond diamond Length of one side (μm) 50 170 230 50 170 240 400 Long axis length (μm) 71 240 325 71 240 339 566 Composition of light-shielding layer (preparation example) Preparation Example 1 Preparation Example 1 Preparation Example 1 Preparation Example 2 Preparation Example 2 Preparation Example 1 Preparation Example 1 △ L (μm) 29 100 135 29 100 141 234 H (μm) 43 147 199 43 147 208 346 Long axis length difference (μm) 29 100 135 29 100 141 234 W (μm) 102 345 467 102 345 488 813 Light shielding ◎ ○ △ ◎ ○ △ X About the visibility of RGB in pixels good good good good good difference difference

As shown in Table 2, by improving the uniformity between the display area and the non-display area during the operation of the optical display to prevent the RGB in the pixels from being observed, the polarizing plate according to the present invention exhibits good light shielding performance and enables display. The difference in visibility at the interface between the area and the non-display area is minimized.

In contrast, in the polarizing plate of Comparative Example 1 in which H is larger than 200 μm, a serious difference in visibility occurs at the interface between the display area and the non-display area during the operation of the optical display, so that RGB in the pixel can be observed. And in the polarizing plate of Comparative Example 2 where H is greater than 200 μm, the light-shielding layer exhibits poor light shielding and serious visibility differences occur at the interface between the display area and the non-display area when the optical display operates, making the RGB can be observed.

It should be understood that those with ordinary knowledge in the technical field can make various modifications, changes, alterations and equivalent embodiments without departing from the spirit and scope of the present invention.

10: Polarizing plate 20: Liquid crystal cell 30: Metal interconnect 40: Dummy wafer 50: Polarizing plate 60: Polarizing plate 100: Polarizer 200: Polarizer protective film 310: Adhesive layer 320: Light shielding layer 321: First printing pattern 322: second printed pattern 323: printed pattern 324: non-printed area 400: polarizer protective film ΔL: distance 321L: long axis 322L: long axis a: point a ': point b: point c: point d: point H : Distance S1: display area S2: non-display area T: distance W: distance

FIG. 1 is a perspective view of a polarizing plate according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a polarizing plate according to an embodiment of the present invention. FIG. 3 is an enlarged view of a printed pattern of a part of the light-shielding layer. 4 is a cross-sectional view of a printed pattern of a part of a light-shielding layer. FIG. 5 is a cross-sectional view of a sample for evaluating whether RGB in a pixel can be recognized in an example and a comparative example.

Claims (14)

A polarizing plate is composed of a display area and a non-display area surrounding the display area. The polarizing plate includes: a polarizer; and a first polarizer protective film formed on a surface of the polarizer through an adhesive layer. The adhesive layer includes a light-shielding layer embedded in the adhesive layer to constitute at least a part of the non-display area, wherein the light-shielding layer includes a plurality of printed patterns separated from each other, and each of the plurality of printed patterns The method includes a first printing pattern and a second printing pattern. The second printing pattern is formed on the first printing pattern and has a shape different from that of the first printing pattern. The point where the interface between the non-display areas and the first printed pattern abut is indicated as point a, and the two adjacent first printed patterns and the display area and the non-display area The point adjacent to the interface is represented as point b, the vertex or inflection point closest to point a in the first printed pattern is represented as point c, and the vertex or inflection point closest to point b in the first printed pattern is represented When it is point d, the distance from the interface between the display area and the non-display area to point c, and the distance from the interface between the display area and the non-display area to point d The minimum value of H is 200 μm or less. The polarizing plate according to item 1 of the scope of patent application, wherein when the point of the second printed pattern closest to the interface between the display area and the non-display area is represented as point a ′ The shortest distance ΔL between the points a and a 'is 200 μm or less. The polarizing plate according to item 2 of the scope of patent application, wherein the shortest distance ΔL is in a range of 0.1 μm to 200 μm. The polarizing plate according to item 1 of the scope of patent application, wherein a difference between a maximum long axis length of the first printed pattern and the second printed pattern is 200 μm or less. The polarizing plate as described in claim 1, wherein the light shielding layer is formed to contact a surface of the adhesive layer while surrounding the periphery of the adhesive layer. The polarizing plate as described in claim 1, wherein an area of the first printed pattern is larger than an area of the second printed pattern. The polarizing plate according to item 1 of the scope of patent application, wherein when the distance between the point a and the point b is W, W satisfies the relational expression 1: 0.1 × W ≤ H ≤ 0.5 × W. The polarizing plate according to item 1 of the scope of patent application, wherein the first printing pattern has a regular hexagonal shape and is arranged in a honeycomb structure, and the second printing pattern has a rhombus or square shape. The polarizing plate as described in claim 1, wherein the light-shielding layer is formed of a composition including a pigment, a binder resin, and an initiator. The polarizing plate according to item 9 of the scope of patent application, wherein the composition for the light-shielding layer further includes a reactive unsaturated compound. The polarizing plate according to item 9 of the scope of patent application, wherein the pigment includes carbon black, a mixed pigment of silver-tin alloy, or a combination thereof. The polarizing plate according to item 1 of the scope of patent application, wherein the light shielding layer is directly formed on a surface of the first polarizer protective film. The polarizing plate according to item 1 of the scope of patent application, further comprising: a second polarizer protective film and an adhesive layer sequentially formed on the other surface of the polarizer. An optical display includes the polarizing plate according to any one of claims 1 to 13 of the scope of patent application.