TWI613471B - Polarizer assembly and display apparatus - Google Patents

Abstract

A polarizing plate assembly includes: a polarizing substrate; a protective layer on one side of the polarizing substrate; a surface protective film on the other side of the protective layer relative to the polarizing substrate; and another protective layer on the polarizing substrate relative to the protection The other side of the layer; and an adhesive layer on the other side of the other protective layer relative to the polarizing substrate. Among them, the polarizing plate assembly further includes an absorbing material, whose transmission spectrum at a wavelength of 570-600nm is more than 10% lower than the transmission spectrum at a wavelength of 450nm, and more than 15% lower than the transmission spectrum at a wavelength of 650nm.

Description

Polarizing plate assembly and display device

The invention relates to a polarizing plate assembly, in particular to a wide-color-gamut polarizing plate assembly. The invention also relates to a display device using such a polarizing plate assembly.

A polarizer or polarizer is an optical element that can convert natural light that is generally not polarized into polarized light that is polarized in a specific direction, or that passes only polarized light in a specific direction. For example, parallel light that is in the same direction as the polarizer can Pass, but the vertical light orthogonal to the direction of the polarizing plate will be blocked and cannot be transmitted. In this way, the polarization of the light after passing through the polarizing plate can be controlled. Polarizers or polarizers have a wide range of applications, including camera lenses, microscopes, 3D stereo glasses, sunglasses, display panels, and so on. Depending on the purpose and efficacy desired, the composition and materials of polarizers will vary.

With the development of science and technology and people's increasing requirements for the color effect of display products, liquid crystal display panels have also developed in the direction of improving the color gamut, that is, increasing the color that can be recognized by the human eye. Wide represents the higher the color coverage that can be recognized by the human eye, so the wide color gamut has also become an indicator of the display quality of the display panel.

The method used to improve the color gamut of the panel in the conventional technology is to use a quantum dot film included in the backlight film to excite the quantum dot film with a blue LED to generate a narrow-band excitation light source to form a wide-band Optical performance of color gamut. However, because the general quantum dot film contains cadmium (Cd), it is toxic and harms the environment. Therefore, how to strike a balance between the demand for display technology with wide color gamut and the world trend of non-toxic and environmental protection, even a win-win situation is still in the industry. One of the goals of the effort.

Therefore, it is sought to improve the color gamut from the display panel structure itself, such as providing a wide color gamut polarizing plate, which is a feasible direction for solving the problems faced by the conventional technology.

Therefore, an object of the present invention is to provide a polarizing plate assembly which can be applied to an optical element to achieve a wide color gamut performance.

The invention provides a polarizing plate assembly, comprising: a polarizing substrate; a protective layer on one side of the polarizing substrate; a surface protective film on the other side of the protective layer relative to the polarizing substrate; and another protective layer on the polarizing substrate The other side is opposite to the protective layer; and an adhesive layer is located on the other side of the other protective layer with respect to the polarizing substrate. Among them, the polarizing plate assembly further includes an absorbing material, whose transmission spectrum at a wavelength of 570-600nm is more than 10% lower than the transmission spectrum at a wavelength of 450nm, and more than 15% lower than the transmission spectrum at a wavelength of 650nm.

Preferably, the transmission spectrum of the absorbing material between the wavelengths of 570-600 nm is more than 15% lower than the transmission spectrum of the wavelengths of 450 nm and more than 20% lower than the transmission spectrum of the wavelengths of 650 nm.

In one embodiment, an absorbent material is incorporated in the adhesive layer.

In another embodiment, the absorbing material is formed between the adhesive layer and the protective layer.

The polarizing plate assembly of the present invention can be applied to, for example, a display device and used in combination with, for example, a twisted nematic (TN) display panel, a lateral electric field effect (IPS) display panel, a vertical alignment (VA) display panel, or an OLED display panel.

Hereinafter, the present invention will be described in more detail by the following examples. It should be noted, however, that the following description of the preferred embodiments of the present invention is for the purpose of description and illustration only, and is not intended to limit the present invention.

Please refer to FIG. 1. The structure of the display panel 11 according to the present invention includes a color filter substrate (not shown) and a thin film transistor substrate (not shown) sandwiching a liquid crystal layer (not shown). (Not shown) the liquid crystal configuration is changed by an external electric field control to control the amount of light passing through different liquid crystal regions; the first light modulation element 12 is located on one side of the display panel 11 and is used for adjustment after light enters the display panel Its optical characteristics; the second light modulation element 13 is located on the other side of the display panel 11 and is used to adjust its optical characteristics before the light enters the display panel 11, for example, to pass the passing light (having polarization in any direction) Light) into polarized light of a specific direction; and a backlight element 14 located on the opposite side of the second light modulation element 13 from the display panel 11 to provide a backlight for display.

In order to achieve a wide color gamut without using a toxic quantum dot film, the inventor of the present invention has developed a color gamut enhance polarizer for the first light modulation element 12 and / or the second light modulation The variable element 13 achieves the purpose of polarizing light and improving the color gamut effect at the same time.

The color gamut enhanced polarizing plate may be formed by attaching a polarizing plate assembly according to the present invention to a display panel. The polarizing plate assembly of the present invention is suitable for, for example, a twisted nematic (TN) display panel, a lateral electric field effect (IPS) display panel, a vertical alignment (VA) display panel, or an OLED display panel. Therefore, the liquid crystal layer may correspond to a TN, IPS, or VA liquid crystal cell (Cell).

FIG. 2 is a schematic cross-sectional view of an embodiment of a polarizing plate assembly according to the present invention. The polarizing plate assembly includes a polarizing substrate 30 to change light from non-polarized light to polarized light; an upper protective layer 31 and a lower protective layer 32 to support and protect the polarizing film; and a surface protective film 33 to protect the polarized light. A film; an adhesive layer 34 for attaching a polarizing film to a display panel substrate; and a release film 35 for protecting the adhesive. When the polarizing plate assembly is used, the surface protection film 33 and the release film 35 are peeled off and adhered to the display panel through the adhesive layer 34.

In the above embodiment, the material of the polarizing substrate 30 may be a polyvinyl alcohol (PVA) resin film, which may be made by saponifying a polyvinyl acetate resin. The materials of the protective layers 31 and 32 are, for example, polymethylmethacrylate (PMMA), Triacetyl Cellulose (TAC), acrylic resin film, polyaromatic hydroxy resin film, polyether resin film, and cyclic polyolefin. Resin film (such as polynorbornene resin film), polyester (Polyethylene Terephthalate (PET), polypropylene (PP), Cyclo Olefin Polymer (COP), polycarbonate (Polycarbonate, PC) and the above A group consisting of any combination; the material of the surface protection film 33 is polyethylene (PE), polyethylene terephthalate (PET); the material of the release film 35 is polyethylene (PE), polyethylene terephthalate Ethylene formate (PET) and the like. The above examples of materials are for illustration purposes only, and those skilled in the art may make appropriate selections based on actual needs, without affecting or limiting the scope of implementation and protection of the present invention.

In one embodiment, the polarizing plate assembly may include other structural types of optical layers, such as optical gain, alignment, compensation, steering, orthogonal, diffusion, protection, anti-sticking, scratch resistance, anti-glare, and reflection suppression. Useful layers such as high refractive index, such as alignment liquid crystal layer with controlled viewing angle compensation or birefraction, etc., easy-to-bond treatment layer, hard coating layer, anti-reflection layer, anti-adhesion layer, diffusion Layer, anti-glare layer and other surface treatment layers.

In an embodiment of the present invention, the color gamut-enhancing polarizing plate 22 includes, in addition to the above-mentioned polarizing plate assembly, at least one absorbing material, and the main absorption wavelength of the absorbing material is 560 to 610 nm, more preferably 570 to 600 nm, and the most preferable is 580-590 nm. In addition, the absorbing material 36 may be, for example, a dye, a pigment, or another material capable of absorbing a light band.

In one embodiment, the absorbing material is integrated with the adhesive layer 34 to form an absorbing material-containing adhesive layer 34. Wherein, the absorption material 36 may be incorporated into the adhesive layer 34 and distributed together with the adhesive layer 34, as shown in FIG. 3A. In one embodiment, the absorbing material 36 is provided between the adhesive layer 34 and the lower protective layer 32 as an independent film layer. For example, the absorbent material 36 is formed on the surface of the lower protective layer 32 by coating, spraying, or other film forming methods, and then An adhesive layer 34 is applied as shown in FIG. 3B. In addition to the two methods described above, the absorbing material 36 can also be incorporated into a suitable optical film layer in the polarizing plate when it is stretched into a film, such as the protective layer 31, 32 or the polarizing substrate 30 to achieve an improved color gamut. Effect. When incorporated into the adhesive layer 34 or other optical film layers, its concentration range (or weight percentage) is between 0.1% and 5.0%, preferably between 0.1% and 1.0%. If it is an independent film type, its thickness ranges between 0.1um ~ 5um, preferably between 0.1um ~ 1um.

In addition, the composition of the above-mentioned adhesive layer 34 mainly includes, but is not limited to: (A) a main agent, (B) a bridging agent, and (C) a silane coupling agent. Each composition will be described below.

(A) Main agent : The main agent contains at least one (meth) acrylate. In the following, (meth) acrylate means any one of acrylate or methacrylate, and the remaining "(meth)" The meaning can also be deduced by analogy. The (meth) acrylate may be selected from, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, or n- (meth) acrylate Linear alkyl (meth) acrylates such as octyl ester, undecyl (meth) acrylate; or, for example, selected from: isobutyl (meth) acrylate, 2-ethyl (meth) acrylate Hexyl ester, isooctyl (meth) acrylate, etc., branched alkyl (meth) acrylate; or, for example, can be selected from: 2-methoxyethyl (meth) acrylate, ethyl (meth) acrylate (Meth) acrylic acid-substituted alkyl (meth) acrylates such as oxymethyl esters. In addition, the (meth) acrylate may contain an aryl group, such as benzyl (meth) acrylate, etc .; or the (meth) acrylate may contain an aryloxy group, such as 2-phenoxyethyl (meth) acrylate, 2- (2-phenoxyethoxy) ethyl (meth) acrylate, (meth) acrylate of nonylphenol modified by ethylene oxide, 2- (o-phenyl) (meth) acrylate Phenoxy) ethyl ester and the like. After curing and drying, the cross-linked (meth) acrylate is the main component and structure of the adhesive layer.

In one embodiment, the main agent may include the following formulation ratios: 40 to 90 parts by weight of butyl acrylate (BA), 10 to 40 parts by weight of methyl acrylate (MA), 1 part by weight or less of acrylic acid (AA), and acrylic acid 2- 5 parts by weight or less of hydroxyethyl ester (HEA), 5 parts by weight or less of 2-methoxyethyl acrylate (MEA), and 4-10 parts by weight of 2-phenoxyethyl acrylate (PEA). In one embodiment, the average molecular weight of the main agent is between 1.2 and 1.7 million, and Mw / Mn is between 3.5 and 5.

(B) Bridging agent: The bridging agent can help the (meth) acrylate monomer in the main agent to crosslink, form a network structure, and improve the strength of the adhesive layer. The bridging agent has at least two functional groups in the molecule. Reacts with the polar functional group of the (meth) acrylate monomer in the main agent. Its types are epoxy-based bridging agent, isocyanate-based bridging agent, imine-based bridging agent, metal chelate-based bridging agent, and aziridine. As a bridging agent, one kind can be selected or mixed with a plurality of bridging agents. The total amount of the bridging agent is 0.05 to 20 parts by weight. If the proportion of the bridging agent is too low, although it can increase part of the adhesive force, the cohesion of the formed adhesive layer is insufficient. Foaming may occur during the process.

The epoxy bridging agent can be selected from, for example, bisphenol A epoxy resin, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl Ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, N, N-diglycidylaniline, N, N, N ', N'-tetraglycidyl-m -Xylene diamine, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, and the like.

Isocyanate bridging agent has at least two isocyanate groups (NCO) in the molecule, for example, can be selected from: toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, hydrogenated xylene diisocyanate Isocyanates, diphenylmethane diisocyanates, hydrogenated diphenylmethane diisocyanates, naphthalene diisocyanates, triphenylmethane triisocyanates, and the like. In addition, a bridging agent can also be used by using an adduct obtained by reacting these isocyanate compounds with a polyhydric alcohol such as glycerin or trimethylolpropane, or by forming an isocyanate compound into a dimer or trimer.

The imine bridging agent can be selected from, for example, diethylenetriamine and triethylenetetramine.

The metal chelating bridging agent can be selected from, for example, the multivalent value of ethylacetone or ethylacetate with aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, barium, chromium, zirconium, etc. Compounds formed by coordination of metals.

The aziridine bridging agent can be selected from, for example, diphenylmethane-4,4'-bis (1-aziridinecarboxamide), toluene-2,4-bis (1-aziridinecarboxamide) , Triethylene melamine, m-xylylenedi-bis-1- (2-methylaziridine), p--1-aziridinylphosphine oxide, hexamethylene-1,6-bis (1 -Aziridinecarboxamide), trimethylolpropane-tri-β-aziridinylpropionate, tetramethylolmethane-tri-β-aziridinylpropionate, and the like.

(C) Silane coupling agent: one of the following can be selected or mixed with a plurality of silane coupling agents. The total amount of the silane coupling agent is 0.01 to 10 parts by weight. Silane coupling agents can be selected from, for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyl ginseng (2-methoxyethoxy) silane, 3-methacryloxypropyltrimethoxy Silane compounds containing polymerizable unsaturated groups (such as ethylenic bonds); or, for example, selected from: 3-glycidoxypropyltrimethoxysilane, 2- (3,4-epoxy ring Hexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyl Silane compounds having an epoxy group structure, such as ethoxydimethylsilane; or, for example, selected from: 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N- (2-Aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, etc. Silane compounds; or, for example, halogenated substituent-containing silane compounds such as 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, etc .; other examples: 3-methylpropene Methoxypropyltrimethoxy Silane, 3-mercaptopropyl trimethoxy Silane like. The composition of the adhesive can also be added with other appropriate additives according to the actual product requirements, such as including antistatic agents. For example, the antistatic agent may include various cationic antistatic agents having cationic groups such as a level 4 ammonium salt, a pyridinium salt, and a level 1 to 3 amine group; having a sulfonate group, a sulfate salt group, a phosphoric acid Anionic antistatic agents such as ester salts, phosphonates and other anionic groups; amphoteric antistatic agents such as amino acids and amino sulfates; amino alcohols, glycerols, polyethylene glycols, etc. A nonionic antistatic agent; or a polymer-type antistatic agent obtained by polymerizing the antistatic agent as described above. The antistatic agent is added in an amount of 0.1 to 1.0 parts by weight, and the measured surface impedance range is 10 ¹⁰ to 10 ¹¹ ohms.

(I) 其中，R ⁴¹至R ⁴⁸分別獨立表示氫原子、鹵原子、氰基、硝基、取代或未取代的烷基、取代或未取代的烷氧基、取代或未取代的芳香基、取代或未取代的芳香氧基、取代或未取代的芳烷氧基、或者取代或未取代的胺基，M表示2個氫原子、2個1價金屬原子、2價金屬原子、3價取代金屬原子或氧化金屬原子。 In one embodiment, the absorbing material is a tetraazaporphyrin dye comprising structural formula (I) as shown below:

(I) wherein R ⁴¹ to R ⁴⁸ each independently represent a hydrogen atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic group, A substituted or unsubstituted aromatic oxy group, a substituted or unsubstituted aralkoxy group, or a substituted or unsubstituted amine group, M represents 2 hydrogen atoms, 2 monovalent metal atoms, divalent metal atoms, and trivalent substitution Metal atom or oxidized metal atom.

(II) 式II中，R ₁至R ₄分別獨立地表示氫原子、鹵原子、羥基、可具有取代基之苯基或碳數1至20之1價飽和烴基。 R ₅至R ₈分別獨立地表示氫原子、羥基、巰基、碳數1至5之烷氧基或三氟甲基。 R ₉至R ₁₂分別獨立地表示碳數1至20之1價飽和烴基，該1價飽和烴基所含之氫原子係可被鹵原子、氰基、胺甲醯基、胺磺醯基、羥基或胺基取代，在構成該飽和烴基之碳原子之間可插入氧原子或硫原子。 就R ₁至R ₄中之鹵原子而言，可列舉氟原子、氯原子、溴原子或碘原子。 就R ₁至R ₄及R ₉至R ₁₂中之飽和烴基而言，可列舉例如：甲基、乙基、丙基、丁基、戊基、己基、庚基、辛基、壬基、癸基、十二烷基、十六烷基及二十烷基等碳數1至20之直鏈烷基；異丙基、異丁基、第二丁基、第三丁基、異戊基、新戊基及2-乙基己基等碳數3至20之分支烷基；環丙基、環戊基、環己基、環庚基、環辛基及三環癸基等碳數3至20之脂環式飽和烴基。 就R ₁至R ₄中之苯基可具有之取代基而言，可列舉鹵原子、氰基、羥基、胺基等。 式(II)中，R ₁至R ₄分別獨立，較佳係氫原子。 R ₅至R ₈分別獨立地較佳係氫原子、羥基、或碳數1至5之烷氧基，更佳係氫原子、羥基、甲氧基、或乙氧基。 R ₉至R ₁₂分別獨立地較佳係碳數1至10之烷基(該烷基中，氫原子可具有羥基，碳原子之間可插入氧原子)。 上述材料實例僅為舉例之用，熟習此技藝之人士可視實際需求而為適當選用，並不因此影響或限制本發明的實施與保護範圍。 Another example of the absorbing material 36 is a squarylium dye:

(II) In Formula II, R ₁ to R ₄ each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, a phenyl group which may have a substituent, or a monovalent saturated hydrocarbon group having 1 to 20 carbon atoms. R ₅ to R ₈ each independently represent a hydrogen atom, a hydroxyl group, a mercapto group, an alkoxy group having 1 to 5 carbon atoms, or a trifluoromethyl group. R ₉ to R ₁₂ each independently represent a monovalent saturated hydrocarbon group having 1 to 20 carbon atoms, and the hydrogen atom contained in the monovalent saturated hydrocarbon group may be a halogen atom, a cyano group, a carbamoyl group, an amidino group, a hydroxyl group Or an amine group may be substituted, and an oxygen atom or a sulfur atom may be inserted between the carbon atoms constituting the saturated hydrocarbon group. Examples of the halogen atom in R ₁ to R ₄ include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the saturated hydrocarbon group in R ₁ to R ₄ and R ₉ to R ₁₂ include, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, and decyl Alkyl, dodecyl, hexadecyl, and eicosyl, etc. linear alkyl groups having 1 to 20 carbon atoms; isopropyl, isobutyl, second butyl, third butyl, isopentyl, Neopentyl and 2-ethylhexyl branched alkyl groups having 3 to 20 carbons; cyclopropyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl and tricyclodecyl carbons Alicyclic saturated hydrocarbon. Examples of the substituent which the phenyl group in R ₁ to R ₄ may have include a halogen atom, a cyano group, a hydroxyl group, and an amine group. In the formula (II), R ₁ to R ₄ are each independently and preferably a hydrogen atom. R ₅ to R ₈ are each independently preferably a hydrogen atom, a hydroxyl group, or an alkoxy group having 1 to 5 carbon atoms, and more preferably a hydrogen atom, a hydroxyl group, a methoxy group, or an ethoxy group. R ₉ to R ₁₂ are each independently preferably an alkyl group having 1 to 10 carbon atoms (in the alkyl group, a hydrogen atom may have a hydroxyl group, and an oxygen atom may be inserted between the carbon atoms). The above examples of materials are for illustration purposes only, and those skilled in the art may make appropriate selections based on actual needs, without affecting or limiting the scope of implementation and protection of the present invention.

(I) 其中： 中心金屬M為鈀(palladium; Pd)，摻入濃度為 1%； 取代基R ⁴¹、R ⁴³、R ⁴⁵、R ⁴⁷為三級丁基(tert-butyl)；且 取代基R ⁴²、R ⁴⁴、R ⁴⁶、R ⁴⁸為2-氟苯基(2-fluorophenyl)。 材料2如式I結構， 其中，中心金屬M為銅(copper; Cu)，摻入濃度為1%； 取代基R ⁴¹、R ⁴³、R ⁴⁵、R ⁴⁷為三級丁基(tert-butyl)；且 取代基R ⁴²、R ⁴⁴、R ⁴⁶、R ⁴⁸為2-氟苯基(2-fluorophenyl)。 材料3如式I結構， 其中，中心金屬為銅(copper; Cu)，摻入濃度為0.1% 取代基R ⁴¹、R ⁴³、R ⁴⁵、R ⁴⁷為三級丁基(tert-butyl)；且 取代基R ⁴²、R ⁴⁴、R ⁴⁶、R ⁴⁸為2-氟苯基(2-fluorophenyl)。 The present invention experimentally finds that the transmission spectrum of the absorbing material itself suitable for improving the color gamut in the present invention, and the transmission spectrum of the polarizing plate of the present invention after the absorbing material 36 is doped in the adhesive layer 34 are shown in FIGS. 4A and 4B. As shown, material 1, material 2 and material 3 are: Material 1 has the structure of formula I,

(I) wherein: the central metal M is palladium (Pd), and the concentration is 1%; the substituents R ⁴¹ , R ⁴³ , R ⁴⁵ , and R ⁴⁷ are tert-butyl; and the substituents are R ⁴² , R ⁴⁴ , R ⁴⁶ and R ⁴⁸ are 2-fluorophenyl. Material 2 has the structure of formula I, wherein the central metal M is copper (Cu), and the concentration is 1%; the substituents R ⁴¹ , R ⁴³ , R ⁴⁵ , and R ⁴⁷ are tert-butyl ; And the substituents R ⁴² , R ⁴⁴ , R ⁴⁶ and R ⁴⁸ are 2-fluorophenyl. Material 3 has the structure of Formula I, wherein the central metal is copper (Cu), and the concentration of the substituents R ⁴¹ , R ⁴³ , R ⁴⁵ , and R ⁴⁷ is 0.1% tert-butyl; The substituents R ⁴² , R ⁴⁴ , R ⁴⁶ , and R ⁴⁸ are 2-fluorophenyl.

It can be seen from the figure that the transmission spectrum of the absorption material between the wavelengths of 570-600nm is more than 10% lower than the transmission spectrum of the wavelength of 450nm, that is, T (570nm ~ 600nm) <0.9 * T (450nm), preferably 15% lower Above, more than 20% lower. And the absorption spectrum of the absorption material is more than 15% lower than the transmission spectrum between the wavelengths of 650nm, that is, T (570nm ~ 600nm) <0.85 * T (650nm), preferably 20% lower, and more than 25% lower.

As described above, the polarizing plate assembly according to the present invention can be used in the first light modulation element or the second light modulation element or both of the display panel shown in FIG. Therefore, the backlight emitted by the backlight element 14 does not need to use the blue light excited by the quantum dot film, but can use a general white light backlight source. Of course, different backlight sources can also be used according to other design requirements, or combined with other technologies that help improve the color gamut.

In an example of a display panel, in addition to using the color gamut-enhancing polarizing plate of the present invention in a first light modulating element or a second light modulating element, a metal wire grid polarizing plate can be used in conjunction with another light modulating element. (wire-grid polarizer; WGP). Metal wire grid polarizers are made of metal wires, arranged in parallel to form a grating. The electrons in the metal can only move along the wire. When light is irradiated on the metal wire grid polarizer, the vibration of the light wave vector in the direction of the metal wire will Absorbed by the electrons in the metal wire, the light wave electric vector in the direction of the vertical metal wire can pass, so that only the photons along the longitudinal direction of the wire are absorbed, and the transverse photons are not absorbed, thereby achieving the polarization effect. In addition to using a metal wire to make a grating arranged in parallel and alternately, an optical etching method can also be used to etch a wire of a desired width on a substrate on which a metal thin film is deposited. The metal line pitch of the metal wire grid polarizing plate in this embodiment is in the nanometer class (10-200 nm) and the height is 50-1000 nm. The metal used may be aluminum, silver, gold, lead, copper, etc. Aluminum is preferred.

In addition, according to the characteristics of the metal fence polarizing plate, a unilateral compensation film can be used together. The material of the compensation film 21 is selected, and the vertical alignment (VA) liquid crystal design parameter LC Delta_nd is designed in the range of 300 ~ 370nm, so that R0 is between 50 ~ 100nm, preferably 70-100nm, and Rth is 200 ~ Between 350nm, preferably between 270-320nm. Among them, R0 = (nx-ny) × d; and Rth = ((nx + ny) / 2–nz) × d, where nx, ny, and nz represent the three-dimensional space of the compensation film in the x-axis, y-axis, and z-axis, respectively. Refractive index, d represents the thickness of the compensation film 21). At this time, it can have a viewing angle performance equivalent to or better than the original bilateral compensation film. The material of this unilateral optical compensation film can be cellulose triacetate (TAC), cycloolefin polymer (COP), polymethyl methacrylate (PMMA ), Polycarbonate (PC), liquid crystal or composite materials. An example of the structure of a display panel composed of the above elements is shown in FIG. 5A or 5B.

FIG. 6 is a schematic diagram showing changes in the color gamut of the display panel of the present invention under various standards, where the x-axis is the chromaticity x and the y-axis is the chromaticity y. The display panel prepared by using the color gamut enhanced polarizing plate developed by the present invention can effectively improve the color gamut by more than 10% without the need for a quantum dot film. For example, the NTSC color gamut can be increased by approximately 25%, the DCI-P3 color gamut can be increased by approximately 27%, and the BT2020 color gamut can be increased by approximately 19%. If CGEP and WGP are used as the upper and lower polarizers, in addition to effectively improving the color gamut by more than 10%, it can reach 30% transmittance and wide viewing angle performance, and it has a thinning effect because only a single-sided compensation film is required. .

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. For example, although the application of the color gamut-enhancing polarizing plate of the present invention to a liquid crystal display panel is taken as an example in the above description, any familiarity Without departing from the spirit and scope of the present invention, the color gamut enhancement polarizer of the present invention can be used in different optical elements to achieve similar purposes. In addition, those skilled in the art can also make some changes and retouching. Therefore, the protection scope of the present invention shall be determined by the scope of the appended patent application.

11‧‧‧Display Panel

12‧‧‧The first light modulation element

13‧‧‧Second light modulation element

14‧‧‧ backlight

30‧‧‧Polarized substrate

31‧‧‧ protective layer

32‧‧‧ protective layer

33‧‧‧Surface protection film

34‧‧‧Adhesive layer

35‧‧‧ release film

36‧‧‧ Absorbent material

FIG. 1 is a schematic sectional view of a display panel structure according to an application example of a polarizing plate assembly according to the present invention; FIG. 2 is a schematic sectional view of a polarizing plate assembly structure according to an embodiment of the present invention; and FIG. 3A is an implementation according to the present invention The distribution diagram of the absorbing material contained in the example polarizing plate assembly in the structure of the polarizing plate assembly; FIG. 3B is a schematic diagram of the distribution of the absorbing material contained in the polarizing plate assembly in the structure of the polarizing plate assembly according to another embodiment of the present invention; FIG. 4B is a transmission spectrum diagram of an example of three absorbing materials included in a polarizing plate assembly according to an embodiment of the present invention; FIG. 4B is a transmission spectrum diagram of an example of three absorbing materials included in a polarizing plate assembly according to an embodiment of the present invention 5A and 5B are schematic cross-sectional views of two display panel structure examples, in which the display panel includes a polarizer assembly according to an embodiment of the present invention and a metal wire grid polarizer; and FIG. 6 is a display device of the present invention Schematic diagram of color gamut enhancement effect.

no.

30‧‧‧Polarized substrate

31‧‧‧ protective layer

32‧‧‧ protective layer

33‧‧‧Surface protection film

34‧‧‧Adhesive layer

35‧‧‧ release film

Claims (9)

A polarizing plate assembly includes: a polarizing substrate; a protective layer on one side of the polarizing substrate; another protective layer on the other side of the polarizing substrate opposite to the protective layer; and an adhesive layer on the polarizing substrate. The protective layer is opposite to the other side of the polarizing substrate, wherein the polarizing plate assembly further includes an absorbing material, and its transmission spectrum between the wavelengths of 570-600nm is more than 10% lower than the transmission spectrum of the wavelength of 450nm, and the wavelength The transmission spectrum at 650nm is more than 15% lower. The absorption material is a tetraazaporphyrin dye containing the structural formula (I) shown below or a squarylium dye containing the structural formula (II) shown below. ):

Among them, R ⁴¹ to R ⁴⁸ each independently represent a hydrogen atom, a halogen atom, a cyano group, a nitro group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic group, a substituted or unsubstituted A substituted aromatic oxy group, a substituted or unsubstituted aralkoxy group, or a substituted or unsubstituted amine group; M represents 2 hydrogen atoms, 2 monovalent metal atoms, divalent metal atoms, trivalent substituted metal atoms, or Oxidizing metal atoms

Among them, R ₁ to R ₄ each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, a phenyl group which may have a substituent, or a monovalent saturated hydrocarbon group having 1 to 20 carbon atoms; R ₅ to R ₈ each independently represent a hydrogen atom, Hydroxyl group, mercapto group, alkoxy group having 1 to 5 carbon atoms or trifluoromethyl group; R ₉ to R ₁₂ each independently represent a monovalent saturated hydrocarbon group having 1 to 20 carbon atoms, and the hydrogen atom system contained in the monovalent saturated hydrocarbon group It may be substituted with a halogen atom, a cyano group, a carbamoyl group, an sulfamoyl group, a hydroxyl group, or an amine group, and an oxygen atom or a sulfur atom may be inserted between the carbon atoms constituting the saturated hydrocarbon group. The polarizing plate assembly according to item 1 of the scope of patent application, wherein the polarizing base material is selected from polyvinyl alcohol resin, and / or the material of the protective layer and the other protective layer is selected from polymethyl methacrylate (Polymethylmethacrylate (PMMA)), Triacetyl Cellulose (TAC), acrylic resin film, polyaromatic hydroxy resin film, polyether resin film, cyclic polyolefin resin film, polyester (Polyethylene Terephthalate, PET), polypropylene (Polypropylene, PP), Cyclo Olefin Polymer (COP), Polycarbonate (PC), or a combination thereof. The polarizing plate assembly according to item 1 of the scope of patent application, wherein the main absorption wavelength of the absorbing material is 560 to 610 nm. The polarizing plate assembly according to item 1 of the scope of patent application, wherein the absorbing material is incorporated in the adhesive layer. The polarizing plate assembly according to item 1 of the scope of patent application, wherein the independent film layer type of the absorbing material is formed between the adhesive layer and the protective layer. The polarizing plate assembly according to item 1 of the patent application scope, wherein the absorbing material is incorporated in the protective layer or the polarizing substrate. The polarizing plate assembly according to item 4 or 6 of the scope of patent application, wherein the concentration range of the absorbing material is 0.1% to 5.0%. The polarizing plate assembly according to item 5 of the scope of patent application, wherein the thickness of the independent film layer is 0.1um ~ 5um. A display device includes: a polarizing plate assembly as described in any one of claims 1 to 8 of the patent application scope; and a display panel, wherein the display panel is a twisted nematic (TN) display panel, a lateral electric field effect (IPS ) Display panel, vertical alignment (VA) display panel, or OLED display panel.