Polarizing plate for display device and display device including the same

Abstract

The present disclosure relates to a display device for a vehicle and a polarizing plate for a display, the polarizing plate including a polarizer that allows only light polarized in a specific direction to pass therethrough; and a haze adhesive film disposed on either surface of the polarizer, wherein the haze adhesive film is adhered to the display device and has a haze of 49% to 65% to reduce moire fringes occurring due to a dual-unit structure of the display device.

Description

Technical Field

[0001] The present disclosure relates to a polarizing plate for a display device and a display device including the same, and more particularly, to a polarizing plate for a display device having a dual-cell structure and a display device including the same.

[0002] This application claims the benefit of Korean Patent Application No. 10-2020-0134636 filed on October 16, 2020, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Background Art

[0003] An optical device such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) uses a polarizing plate to control optical activity or birefringence or to prevent reflection of external light.

[0004] Meanwhile, recently, in order to realize high-end resolution of LCD devices, so-called dual-cell displays including LCD cells stacked in two layers are being applied. In particular, the dual-cell display improves contrast in an attempt to overcome the disadvantage that LCDs have difficulty in producing black (darkness).

[0005] However, display devices using polarizing plates exhibit a moire or rainbow phenomenon, i.e., a phenomenon in which interference patterns appear in a display when two or more periodic patterns overlap on top of one another, which disturbs the user's eyes, resulting in low visibility. In particular, since a dual-unit display includes one or more LCD units stacked in a periodic pattern, the moire or rainbow phenomenon becomes more severe. Summary of the invention

[0006] Technical issues

[0007] The present disclosure is directed to providing a polarizing plate for a display device having a dual-cell structure, wherein a moire fringe or rainbow phenomenon of the display device is reduced.

[0008] The present disclosure also relates to providing a display device having a dual-cell structure in which a moire or rainbow phenomenon is reduced.

[0009] Technical Solution

[0010] In order to solve the above technical problems, according to one embodiment of the present disclosure, a polarizing plate for a display device is provided.

[0011] That is, the polarizing plate according to the first embodiment is a polarizing plate for a display device having a dual-cell structure,

[0012] The polarizing plate includes: a polarizer that allows only light polarized in a specific direction to pass through; and

[0013] A haze adhesive film disposed on either surface of a polarizer, wherein the haze adhesive film is adhered to a display device and has a haze of 49% to 65% to reduce moire fringes occurring due to a dual-cell structure of the display device.

[0014] According to a second embodiment of the present disclosure, in the first embodiment, the haze of the adhesive film may be 50% to 60%.

[0015] According to a third embodiment of the present disclosure, in the first embodiment or the second embodiment, the thickness of the haze adhesive film may be 20 μm to 22 μm.

[0016] According to a fourth embodiment of the present disclosure, in at least one of the first to third embodiments, the polarizing plate may further include protective films each stacked between one surface of the polarizer and the haze adhesive film and on the other surface of the polarizer.

[0017] According to a fifth embodiment of the present disclosure, in at least one of the first to fourth embodiments, the haze adhesive film may be formed by uniformly dispersing beads having haze in an acrylic polymer, and according to a sixth embodiment of the present disclosure, the beads having haze may be silica beads.

[0018] Furthermore, in order to solve the above technical problem, according to another embodiment of the present disclosure, a display device is provided.

[0019] That is, the display device of the seventh embodiment includes: at least two layers of display units, the at least two layers of display units including an upper display unit and a lower display unit disposed at a higher position and a lower position, the upper display unit and the lower display unit each having a matrix array to display an image; and

[0020] At least three polarizing plates, the at least three polarizing plates comprising an upper polarizing plate disposed on the upper display unit, an intermediate polarizing plate disposed between the upper display unit and the lower display unit, and a lower polarizing plate disposed under the lower display unit,

[0021] Any one of the upper polarizing plate, the middle polarizing plate, and the lower polarizing plate is defined in any one of the first to sixth embodiments described above.

[0022] According to an eighth embodiment of the present disclosure, in the seventh embodiment, the display device may not include an element that limits the viewing angle.

[0023] According to a ninth embodiment of the present disclosure, in the seventh embodiment or the eighth embodiment, the display device may be an automotive display device mounted in a vehicle.

[0024] According to a tenth embodiment of the present disclosure, in at least one of the seventh to ninth embodiments, any one of the polarizing plates may be an upper polarizing plate,

[0025] And the upper polarizing plate may be stacked on the upper display unit so that the haze adhesive film of the upper polarizing plate is disposed under the polarizer.

[0026] According to an eleventh embodiment of the present disclosure, in at least one of the seventh to ninth embodiments, any one of the polarizing plates may be a lower polarizing plate,

[0027] And the lower polarizing plate may be stacked under the lower display unit so that the haze adhesive film of the lower polarizing plate is disposed on the polarizer.

[0028] According to a twelfth embodiment of the present disclosure, in at least one of the seventh to ninth embodiments, any one of the polarizing plates may be an intermediate polarizing plate,

[0029] And the intermediate polarizing plate may be stacked between the upper display unit and the lower display unit so that the haze adhesive film of the intermediate polarizing plate is disposed above or below the polarizer.

[0030] According to a thirteenth embodiment of the present disclosure, in at least one of the seventh to twelfth embodiments, either one of the upper display unit and the lower display unit may be a color liquid crystal display (LCD) unit, and the other may be a black and white LCD unit or a color LCD unit.

[0031] Beneficial Effects

[0032] Since the polarizing plate for a display device according to the present disclosure has the adhesive film having a haze within a predetermined range, a moire or rainbow phenomenon caused by a dual-unit structure of the display device may be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic cross-sectional view of a polarizing plate for a display device according to an embodiment of the present disclosure.

[0034] Figure 2 is a schematic cross-sectional view of a display device according to another embodiment of the present disclosure.

[0035] Figure 3 is a schematic cross-sectional view of a display device according to still another embodiment of the present disclosure.

[0036] Figure 4 is a schematic cross-sectional view of a display device according to still another embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings. The terms or words used in the specification and the appended claims should not be interpreted as limited to the general and dictionary meanings, but should be interpreted based on the meaning and concept corresponding to the technical aspects of the present disclosure based on the principle of allowing the inventor to appropriately define the terms to obtain the best interpretation.

[0038] Figure 1 is a schematic cross-sectional view illustrating a structure of a polarizing plate for a display device, particularly, a liquid crystal display (LCD) having a dual-cell structure according to an embodiment of the present disclosure.

[0039] The polarizing plate according to one embodiment of the present disclosure is a polarizing plate for a display device having a dual-unit structure, such as Figure 1 As shown, the polarizing plate includes a polarizer 11 that allows only light polarized in a specific direction to pass therethrough; and a haze adhesive film 13 disposed on either surface of the polarizer 11, the haze adhesive film 13 being adhered to the display device and having a haze of 49% to 65% to reduce moire fringes caused by a dual-unit structure of the display device.

[0040] As described above, a dual-cell display including LCD cells stacked in two layers exhibits a severe moire or rainbow phenomenon.

[0041] The present inventors have found that the problem can be solved when a polarizing plate having a haze within a predetermined range is used as a polarizing plate for a display device, and have completed the present disclosure.

[0042] That is, when the haze of the haze adhesive film 13 is less than 49%, the moire phenomenon may not be sufficiently reduced, and when the haze exceeds 65%, it may be difficult to provide sufficient brightness to the display device. The haze of the haze adhesive film is more preferably 50% to 60%.

[0043] The polarizer 11 is a film that converts natural light or polarized light into polarized light, typically, specific linear polarized light. The polarizer 11 may include a well-known polarizer, such as a polyvinyl alcohol-based polarizer, and more specifically, a film containing polyvinyl alcohol or its derivatives, such as a polyvinyl alcohol film and a partially formalized polyvinyl alcohol film (in which iodine or a dichroic material such as a dichroic dye is adsorbed and stretched); and a dehydration product of polyvinyl alcohol. In particular, the polarizer may include a polyvinyl alcohol-based film containing iodine, but is not limited thereto.

[0044] The haze adhesive film 13 can be formed by uniformly dispersing beads with haze in an adhesive film matrix (e.g., an acrylic polymer) of an adhesive film component of a polarizing plate commonly used for display devices. The beads with haze can be, for example, silica beads. Methods for uniformly dispersing beads with haze in a base polymer resin are well known in the art. For example, the haze adhesive film can be manufactured by: preparing an adhesive composition in which an acrylic adhesive composition containing a crosslinkable acrylic polymer having a crosslinkable functional group and an epoxy curing agent or an isocyanate-based curing agent (e.g., toluene diisocyanate or xylene diisocyanate) is dissolved in a solvent; adding beads with haze to the adhesive composition; stirring to disperse the beads; applying the composition to a substrate and thermally curing it. Hereinafter, for illustrative purposes, it will be described in more detail.

[0045] In the crosslinkable acrylic polymer having a crosslinkable functional group, the crosslinkable functional group specifically includes a carboxyl group, a hydroxyl group and an amino group. Among them, a carboxyl group and a hydroxyl group are desirable, and in particular, a carboxyl group is desirable because high adhesive strength is obtained by reacting with an isocyanate-based curing agent as described below.

[0046] Specific examples of crosslinkable monomers for forming crosslinkable acrylic polymers having crosslinkable functional groups may include ethylenically unsaturated carboxylic acids, such as (meth) acrylic acid, itaconic acid, crotonic acid, maleic acid, and fumaric acid; hydroxyalkyl (meth) acrylates, such as 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate; and monoalkylaminoalkyl (meth) acrylates, such as mono(methyl) aminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, mono(methyl) aminopropyl (meth) acrylate, monoethylaminopropyl (meth) acrylate. These may be used alone or in combination of two or more.

[0047] In addition to the above-mentioned crosslinkable monomers with crosslinkable functional groups, crosslinkable acrylic polymers are preferably prepared by adding (meth) acrylate monomers and copolymerization. (Meth) acrylic acid includes acrylic acid and methacrylic acid. Other similar terms are also true. The specific example of (meth) acrylate can include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, myristyl (meth) acrylate, fluorophenazine (meth) acrylate (permitil (meth) acrylate) and stearyl (meth) acrylate. These can be used alone or in combination of two or more. In particular, based on 100 parts by weight of crosslinkable acrylic polymers, the crosslinkable acrylic polymer can be a copolymer comprising 10 to 30 parts by weight of methyl acrylate.

[0048] In addition, in order to provide good bonding strength, nitrogen-containing ethylenically unsaturated monomers may also be included as components. Examples of nitrogen-containing ethylenically unsaturated monomers may include methacrylamide, N-hydroxymethyl methacrylamide, N-methyl methacrylamide, methoxyethyl methacrylamide, N-vinyl pyrrolidone, N,N-dimethyl methacrylamide, N,N-diethyl methacrylamide, N,N-diisopropyl methacrylamide, N-vinyl caprolactam, N-methyl acryloyl morpholine. In some cases, in addition to the above-mentioned monomer components, the crosslinkable acrylic polymer may also include vinyl esters, such as vinyl acetate and vinyl propionate; olefins, such as ethylene, propylene and isobutylene; halogenated olefins, such as vinyl chloride and vinylidene chloride; aromatic vinyl monomers, such as styrene, methyl styrene and vinyl toluene; diene-based monomers, such as butadiene, isoprene and chloroprene; and nitrile-based monomers, such as methacrylonitrile.

[0049] The solvent may include aromatic hydrocarbons such as toluene and xylene; or aliphatic hydrocarbons such as hexane; esters such as ethyl acetate; and ketones such as methyl ethyl ketone, but are not limited thereto.

[0050] If necessary, the adhesive composition may contain various types of additives. For example, an antistatic agent, a chain transfer agent, a surfactant, a plasticizer, a leveling agent, an antioxidant, a corrosion inhibitor, a light stabilizer, and a UV absorber may be appropriately used according to the purpose of use.

[0051] The acrylic adhesive composition may include, for example, 20 wt % to 25 wt % solids based on the total weight of the acrylic adhesive composition.

[0052] The acrylic adhesive composition can be prepared, for example, by mixing the above components together and stirring, and the haze adhesive film 13 of the present disclosure can be manufactured by coating the acrylic adhesive composition on one or both surfaces of various types of carriers and thermally curing. The carrier can be a release film such as a resin film, in which the resin can include, for example, polyester, polypropylene, polyethylene, polyvinyl carbonate, and a laminate thereof.

[0053] The haze adhesive film 13 may be disposed on any surface of the polarizer 11, that is, below or above the polarizer 11, respectively. Figure 1 Here, the upward direction is the direction facing the user in the display device described below. Figure 1 Two polarizing plates 10a and 10b are shown according to the positions of the haze adhesive films 13, respectively, but this is to indicate the direction when the polarizing plates are stacked in the display device, and actually the polarizing plates 10a and 10b manufactured in the form of film products are the same.

[0054] Meanwhile, the polarizing plates 10a and 10b may further include a protective film 12, each of which is stacked on each of the two surfaces of the polarizer 11, that is, between one surface of the polarizer 11 having the haze adhesive film 13 and the haze adhesive film 13 and on the other surface of the polarizer 11 without the haze adhesive film 13. As is known in the art, the protective film 12 is a film made of a resin such as triacetyl cellulose (TAC) and polyester. In addition, although not shown, a non-haze adhesive film (in which beads having haze are not dispersed) may be additionally stacked on the protective film 12 provided on the side to which the haze adhesive film 13 is not attached. As is well known, the adhesive film may be an adhesive film formed by thermally curing an acrylic polymer as described above.

[0055] The polarizer 11 and the protective film 12 attached to both surfaces are included without including Figure 1 The configuration of the polarizing plates 10a and 10b shown in the figure, which includes the haze adhesive film 13 or also includes the non-haze adhesive film, is a common non-haze polarizing plate 10. Figure 1 In the drawings, 10a and 10b are polarizing plates having a haze adhesive film 13 according to the present disclosure.

[0056] A display device according to another aspect of the present disclosure is a display device having a dual-unit structure, wherein any one of the at least three polarizing plates included in the display device is a polarizing plate of the above-mentioned embodiment. That is, the display device according to the present disclosure is a display device that includes at least two layers of display units, the at least two layers of display units include an upper display unit and a lower display unit disposed at a higher position and a lower position, the upper display unit and the lower display unit each having a matrix array to display an image; and at least three layers of polarizing plates, the at least three layers of polarizing plates include an upper polarizing plate disposed above the upper display unit, an intermediate polarizing plate disposed between the upper display unit and the lower display unit, and a lower polarizing plate disposed below the lower display unit, wherein any one of the upper polarizing plate, the intermediate polarizing plate, and the lower polarizing plate is a polarizing plate of the above-mentioned embodiment.

[0057] The display device according to the present disclosure may or may not include an element that limits the viewing angle, such as a so-called louver film.

[0058] In addition, the display device according to the present disclosure can be an automobile display device installed in a vehicle. In this case, when considering the fact that the automobile display device is usually installed in the center of the dashboard (between the driver's seat and the passenger seat), preferably, the automobile display device does not include an element that limits the viewing angle.

[0059] Subsequently, a display device according to another embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0060] Figure 2 is a schematic cross-sectional view of a display device according to another embodiment of the present disclosure.

[0061] Reference Figure 2 , the display device 100a according to this embodiment is a so-called dual-unit LCD device. That is, when the direction of the display device 100a facing the user is the upward direction, at least two layers of display units may include an upper display unit 21 (upper LCD unit) and a lower display unit 22 (lower LCD unit) arranged at a higher position and a lower position. Here, either one of the upper display unit 21 and the lower display unit 22 may be a color LCD unit, and the other may be a black and white LCD unit (single unit), or both may be color LCD units.

[0062] In addition, at least three polarizing plates may include an upper polarizing plate 31 disposed above the upper display unit 21 , an intermediate polarizing plate 32 disposed between the upper display unit 21 and the lower display unit 22 , and a lower polarizing plate 33 disposed below the lower display unit 22 .

[0063] In addition, if Figure 2 As shown, the display device 100a according to the embodiment may include a backlight 50 on the bottom side and a cover glass 40 on the top side. In addition, if necessary, an adhesive layer 60 for adhering two adjacent layers may be inserted between the layers. The adhesive layer 60 is a commonly used haze-free transparent adhesive layer, and may be a film type, such as a double-sided adhesive tape called an optically clear adhesive (OCA); or a liquid type called an optically clear resin (OCR).

[0064] Meanwhile, the configuration, operation, and manufacturing method of each element of the LCD device 100 a having a dual cell structure are well known, and a detailed description is omitted.

[0065] As described above, the LCD device having a dual-unit structure includes a total of three polarizing plates, namely, the upper polarizing plate 31, the middle polarizing plate 32, and the lower polarizing plate 33. In the display device 100a of this embodiment, the upper polarizing plate 31 is the polarizing plate 10a having the haze adhesive film 13 according to the above embodiment. In this case, as Figure 2 As shown, the upper polarizing plate 31 is preferably stacked on the upper display unit 21, so that the haze adhesive film 13 of the polarizing plate 10a including the upper polarizing plate 31 is arranged below the upper polarizing plate 31, that is, below the polarizer 11 (see Figure 1 In the case where the haze adhesive film 13 is disposed on the polarizer 11, haze is imparted to substantially the topmost layer of the display device, so that the user may see a blurred image, and scattering light (to impart haze) before polarizing the light through the polarizer more effectively reduces moire fringes or rainbows that occur due to diffraction and interference of light.

[0066] Figure 3 is a schematic cross-sectional view of a display device according to another embodiment. Figure 2 The display device 100 b according to this embodiment is described with reference to the differences of the display device 100 a according to the above-described embodiment.

[0067] Reference Figure 3 , the display device 100b according to this embodiment is also an LCD device having a dual-cell structure. The display device 100b according to this embodiment is different from the display device 100a according to the above embodiment in that, among a total of three polarizing plates, namely, the upper polarizing plate 31, the middle polarizing plate 32, and the lower polarizing plate 33, the middle polarizing plate 32 is the polarizing plate 10b having the haze adhesive film 13 according to the above embodiment. In this case, although Figure 3The intermediate polarizing plate 32 is shown stacked on the lower display unit 22, so that the haze adhesive film 13 of the polarizing plate 10b including the intermediate polarizing plate 32 is disposed on the intermediate polarizing plate 32, that is, on the polarizer 11 (see Figure 1 (b)), but the haze adhesive film 13 of the polarizing plate including the intermediate polarizing plate 32 may be stacked under the intermediate polarizing plate 32, that is, under the polarizer 11 (see Figure 1 (a)).

[0068] Figure 4 is a schematic cross-sectional view of a display device according to yet another embodiment. Figure 2 The display device 100c according to this embodiment is described based on the differences of the display device 100a according to the above-described embodiment.

[0069] Reference Figure 4 , the display device 100c according to this embodiment is also an LCD device having a dual-cell structure. The display device 100c according to this embodiment is different from the display device 100a according to the above embodiment in that, among a total of three polarizing plates, namely, the upper polarizing plate 31, the middle polarizing plate 32, and the lower polarizing plate 33, the lower polarizing plate 33 is the polarizing plate 10b having the haze adhesive film 13 according to the above embodiment. In this case, as Figure 4 As shown, the lower polarizing plate 33 may be stacked under the lower display unit 22 so that the haze adhesive film 13 of the polarizing plate 10b including the lower polarizing plate 33 is disposed on the lower polarizing plate 33, that is, on the polarizer 11 (see Figure 1 (b)). This is because the backlight 50 is manufactured as a separate component from the display panel (the overall stacking structure from the lower polarizing plate 33 to the cover glass 40) located thereon, and is stacked and fixed without an adhesive film or adhesive.

[0070] At the same time, although referring to Figures 2 to 4 The described embodiment describes that the polarizing plate 10a or 10b with the haze adhesive film 13 according to the above embodiment is applied to the LCD device 100a, 100b, 100c with a dual-unit structure, but the polarizing plate 10a or 10b with the haze adhesive film 13 according to the above embodiment can be applied to an LCD device or an organic light emitting diode (OLED) display device having only a single-layer LCD unit as a display device.

[0071] Hereinafter, the present disclosure will be described in detail by describing embodiments. However, the embodiments of the present disclosure can be modified in many different forms, and the scope of the present disclosure should not be interpreted as being limited to the embodiments described below. The embodiments of the present disclosure are provided to thoroughly and completely describe the present disclosure to those skilled in the art.

[0072] Example 1 and Comparative Examples 1 to 3

[0073] A polarizer (thickness 22 μm) was manufactured by swelling a polyvinyl alcohol film (thickness: 60 μm, Kuraray, VF-PS#6000) in a 25°C aqueous solution, dyeing it in a 30°C dye bath, and further stretching the dyed polyvinyl alcohol film in a 55°C boric acid solution to give a final elongation of about 5.9 times.

[0074] Meanwhile, a polarizing plate was manufactured by attaching a haze adhesive film manufactured as follows to one surface of a polarizer.

[0075] Preparation of acrylic adhesive compositions containing silica beads

[0076] An acrylic polymer having a weight average molecular weight of 1,800,000, a curing agent, and silica beads having a particle size of 4 to 5 μm (Momentive T-145) according to the composition ratio of Table 1 below were mixed with a solvent (ethyl acetate) to prepare an acrylic adhesive composition having the indicated solid content.

[0077] In the following Table 1, among the types of monomers used in the polymerization of acrylic polymers, BA is butyl acrylate, MA is methyl acrylate, BzA is benzyl acrylate, AA is acrylic acid, and 4-HBA is 4-hydroxybutyl acrylate. In addition, SCA is a silane coupling agent, and the antistatic agent is a product from 3M.

[0078] Table 1 shows the amounts of components other than the acrylic polymer based on 100 parts by weight of the acrylic polymer.

[0079] [Table 1]

[0080]

[0081] Preparation of haze adhesive films

[0082] The acrylic adhesive compositions of Examples and Comparative Examples were coated on release films and dried at 80° C. for 3 minutes to prepare adhesive films having a thickness level of 20 μm.

[0083] <Haze Evaluation of Adhesive Film>

[0084] A haze meter was used to measure the haze.

[0085] <Evaluation of Haze Properties of Adhesive Films>

[0086] The manufactured polarizing plate having the haze adhesive film was stored at room temperature for 3 days, and the characteristics of the haze adhesive film were evaluated by the following method.

[0087] Glass bonding strength: A sample having a width of 25 mm and a length of 200 mm was manufactured, attached to glass, stored at room temperature for 1 hour, and peeled at 90° using a peeler to evaluate the glass bonding strength by a peel test.

[0088] Heat-resistant reliability: Samples having a width of 15 cm and a length of 20 cm were manufactured, attached to glass, and degassed under the conditions of 50° C. and 5 atmospheres. Subsequently, each sample was stored at 95° C. for 500 hours, and the number of bubbles formed in an area of ​​5 cm×5 cm was evaluated as follows, and the results are shown in Table 2.

[0089] ◎: No bubbles

[0090] ○: Less than 5 bubbles

[0091] Δ: 5 to 9 bubbles

[0092] X: 10 or more bubbles or swelling

[0093] <Evaluation of the Presence or Absence of Moire Phenomenon in a Dual-Cell LCD Device Having a Haze Adhesive Film>

[0094] The polarizing plate 10a having the haze adhesive film 13 manufactured by the above method is attached to the upper surface of the upper LCD unit 21, and the lower LCD unit 22 which is the same LCD unit as the upper LCD unit is stacked thereon, and the moire phenomenon (presence or absence of rainbow spots) is detected by eye in the black mode.

[0095] [Table 2]

[0096]

[0097] As shown in Table 2, it can be seen that Example 1 using a polarizing plate having a haze adhesive film with haze adjusted to a specific range does not exhibit the moire phenomenon, while Comparative Examples using polarizing plates having a haze adhesive film with no haze or haze outside a specific range exhibit the moire phenomenon.

[0098] [Explanation of Reference Numerals]

[0099] 10: Polarizing plate

[0100] 10a, 10b: Polarizing plate with haze adhesive film 11: Polarizer

[0101] 12: Protective film

[0102] 13: Haze Adhesive Film

[0103] 21: Upper display unit (upper LCD unit)

[0104] 22: Lower display unit (lower LCD unit)

[0105] 31: Upper polarizing plate

[0106] 32: Middle polarizer

[0107] 33: Lower polarizing plate

[0108] 40: Cover glass

[0109] 50: Backlight

[0110] 60: Adhesive layer 100a, 100b, 100c: Display device

Claims

1. A polarizing plate for a display device having a dual-unit structure, the polarizing plate comprising: A polarizer that allows only light polarized in a specific direction to pass through; as well as a haze adhesive film disposed on either surface of the polarizer, wherein the haze adhesive film is adhered to the display device and has a haze of 49% to 65% to reduce moire fringes occurring due to the dual-unit structure of the display device, wherein the haze adhesive film is formed by uniformly dispersing beads having haze in a cross-linkable acrylic polymer having a cross-linkable functional group, Wherein, the cross-linkable acrylic polymer is a copolymer including 10 to 30 parts by weight of methyl acrylate based on 100 parts by weight of the cross-linkable acrylic polymer. 2 . The polarizing plate for a display device having a dual unit structure according to claim 1 , wherein the haze adhesive film has a haze of 50% to 60%. 3 . The polarizing plate for a display device having a dual unit structure according to claim 1 , wherein a thickness of the haze adhesive film is 20 μm to 22 μm.

4. The polarizing plate for a display device having a dual-cell structure according to claim 1, further comprising: Protective films are each stacked between one surface of the polarizer and the haze adhesive film and on the other surface of the polarizer. 5 . The polarizing plate for a display device having a dual-cell structure according to claim 1 , wherein the beads having haze are silica beads.

6. A display device, comprising: At least two layers of display units, the at least two layers of display units comprising an upper display unit and a lower display unit arranged at a higher position and a lower position, the upper display unit and the lower display unit each having a matrix array to display an image; as well as at least three layers of polarizing plates, the at least three layers of polarizing plates comprising an upper polarizing plate disposed on the upper display unit, an intermediate polarizing plate disposed between the upper display unit and the lower display unit, and a lower polarizing plate disposed under the lower display unit, Any one of the upper polarizing plate, the middle polarizing plate, and the lower polarizing plate is the polarizing plate according to any one of claims 1 to 5. The display device according to claim 6 , wherein the display device does not include an element that limits a viewing angle.

8. The display device according to claim 6, wherein the display device is an automotive display device installed in a vehicle.

9. The display device according to claim 6, wherein the polarizing plate among the upper polarizing plate, the middle polarizing plate and the lower polarizing plate which is the polarizing plate according to any one of claims 1 to 5 is the upper polarizing plate, and The upper polarizing plate is stacked on the upper display unit so that the haze adhesive film of the upper polarizing plate is disposed under the polarizer.

10. The display device according to claim 6, wherein the polarizing plate among the upper polarizing plate, the middle polarizing plate and the lower polarizing plate which is the polarizing plate according to any one of claims 1 to 5 is the lower polarizing plate, and The lower polarizing plate is stacked under the lower display unit so that the haze adhesive film of the lower polarizing plate is disposed on the polarizer.

11. The display device according to claim 6, wherein the polarizing plate among the upper polarizing plate, the middle polarizing plate, and the lower polarizing plate that is the polarizing plate according to any one of claims 1 to 5 is the middle polarizing plate, and The intermediate polarizing plate is stacked between the upper display unit and the lower display unit such that the haze adhesive film of the intermediate polarizing plate is disposed above or below the polarizer. 12 . The display device according to claim 6 , wherein either one of the upper display unit and the lower display unit is a color liquid crystal display unit, and the other is a black-and-white liquid crystal display unit or a color liquid crystal display unit.

Images