KR20150038835A - Polarizing Device - Google Patents

Abstract

The present invention relates to a polarizing device and a display device. Provided in the present invention are a polarizing device including a polarizer and a liquid crystal layer arranged on one surface of including a dichromatic yellow dye forming lyotropic liquid crystal, and a display device including the same.

Description

Polarizing Device

The present application relates to a polarizing element and a display device.

A polarizer is a functional device capable of extracting light that vibrates in one direction from incident light that vibrates in various directions. As the polarizer, for example, those produced on the basis of a polymer film such as poly (vinyl alcohol) (PVA) or the like can be used.

For example, as the polarizer, a polyvinyl alcohol film or sheet in which a dichroic dye or iodine is adsorbed and oriented can be used. The polyvinyl alcohol can be obtained by, for example, gelling polyvinyl acetate. Examples of the polyvinyl acetate include homopolymers of vinyl acetate; And copolymers of vinyl acetate and other monomers, and the like. As the other monomers copolymerized with vinyl acetate, there may be mentioned one kind or more of unsaturated carboxylic acid compounds, olefinic compounds, vinyl ether compounds, unsaturated sulfonic acid compounds and acrylamide compounds having an ammonium group.

The present application provides a polarizing element and a display device.

An exemplary polarizing element of the present application may include a polarizer and a liquid crystal layer disposed on one side of the polarizer and including a dichroic yellow dye capable of forming a liquid-crystal liquid crystal phase.

The polarizer may be referred to as a so-called high-transmittance polarizer.

The polarizing element may have a transmittance of 40% or more.

The polarizing element may have a polarization efficiency of 98% or more.

The optical transit dipole moment of the dichroic dye or the projection of the moment into the plane of the polarizer may be parallel or perpendicular to the absorption axis of the polarizer.

The dichroic dye may be represented by the following formula (1).

[Chemical Formula 1]

A is a single bond, an alkylene group having 1 to 12 carbon atoms or an alkylidene group having 1 to 12 carbon atoms, -SO ₂ NH-T-, -SO ₂ -T-, - CONH-T-, -CO-T-, -OT-, -ST- or -NH-T-, wherein T is an alkylene or alkylidene group having 1 to 10 carbon atoms, R is a salt- , and n is the number of AR groups bonded to Q,

Moiety R of the salt form in the above, -SO ₃ ^- M ⁺ or -COO ^- M ^+, and, in the M ⁺ may be an inorganic cation.

The dichroic dye may be represented by the following formula (2).

(2)

In Formula 2 is -U-, -N = N- or _{-O- (CH 2) - (CHOH} ) - (CH 2) -O- , X is, each independently represent an aryl group having 6 to 18 carbon atoms or R ₁ is a hydroxyl group, an alkoxy group having 1 to 12 carbon atoms, a haloalkyl group having 1 to 12 carbon atoms, an oxo group, or -N = N-Ph Wherein Ph is an alkoxy group having 1 to 12 carbon atoms or an unsubstituted phenyl group, l and m each independently represent 1 or 2, and p and q are The number of R ₁ substituted on X is independently 0 to 2.

The polarizing element may further include a quarter-wave retardation layer disposed under the liquid crystal layer.

The display device may include the polarizing element.

The display device may be a liquid crystal display device or an organic light emitting display device

The present application can provide a polarizing element and a display device including the polarizing element including a polarizing element and a liquid crystal layer disposed on one surface of the polarizing element and including a dichroic yellow dye capable of forming a liquid crystal liquid crystal phase.

1 is a cross-sectional view of an exemplary polarizing element.

An exemplary polarizing element of the present application includes: a polarizer; And a liquid crystal layer including a liquid crystal liquid crystal disposed on one side of the polarizer. FIG. 1 is a cross-sectional view showing an exemplary polarizing element, in which a polarizer 1 and a liquid crystal layer 2 are sequentially formed and an optional 1/4 wavelength retardation layer 3 is formed on the liquid crystal layer 2 As shown in FIG.

The polarizer included in the polarizing element may be a polarizer called a so-called high-transmittance polarizer, and if necessary, a protective film for a polarizer may be disposed on one side or both sides thereof.

A layer containing a liquid crystal liquid crystal is present on one side of the polarizer.

As the liquid-crystal liquid crystal, a yellow dye can be used as a dichroic dye capable of forming an LLC (Lyotropic Liquid Crystal) phase. In the dichroic dye, the optical transition dipole moment of an anisotropically absorbing fragment may be arranged, for example, perpendicularly or horizontally to the absorption axis of the polarizer.

When the terms such as vertical, horizontal, orthogonal, or parallel are used in defining the angle in this specification, it means substantially vertical, horizontal, orthogonal, or parallel to the extent that does not impair the aimed effect. For example, Manufacturing error or variation, and the like. Thus, for example, each of the above cases may include an error within about +/- 15 degrees, preferably within about +/- 10 degrees, and more preferably within about +/- 5 degrees.

As used herein, the term " LLC (Lyotropic Liquid Crystal) " may mean a material exhibiting liquid crystallinity at a constant composition or concentration.

As used herein, the term " dichroic dye " may refer to a substance that exhibits anisotropic absorption behavior of an electron beam at a predetermined wavelength range, for example, a molecule capable of absorbing more light in a specific direction than in another direction .

In one example, the projection of the liquid crystal layer to the plane of the liquid crystal layer may be parallel or perpendicular to the optical absorption axis or light transmission axis of the liquid crystal liquid crystal. In a suitable example, the optical transfer dipole moment may be parallel or perpendicular to the light absorption axis or light transmission axis of the polarizer.

In one example, the dichroic dye molecule or one or more anisotropic absorption segments of the molecule may have a linear structure such that the optical transitivity dipole moment and optical axis in the liquid crystal layer can be positioned parallel or perpendicular to the axis of the polarizer.

In the film, the dichroic dye can form a stable liquid-crystal liquid crystal phase. Accordingly, in one example, a composition containing the dichroic dye (hereinafter, sometimes referred to as a " liquid-crystal liquid crystal composition ") may be used, for example, as disclosed in U.S. Patent No. 5,739,296 Which can be realized by a method which imposes shearing force or wedging forces caused by separation of the liquid crystal liquid crystal composition layer from one surface to another, mechanical ordering) to form the liquid crystal layer.

The liquid-crystal liquid crystal phase can be obtained, for example, by the use of supermolecular complexes of the dichroic dyes and molecular associates or molecular complexes of a low degree of aggregation of the dichroic dyes and / .

In one example, the dichroic dye may have a maximum absorption wavelength in the range of 350 nm to 900 nm, preferably 350 nm to 600 nm, more preferably 440 nm to 500 nm. In this range, for example, the film can exert excellent performance in a display device.

The dichroic dye may have a molecular weight of 300 g / mol to 900 g / mol, preferably 450 g / mol to 800 g / mol, more preferably 600 g / mol to 900 g / mol. Within this range, the dichroic dye exhibits an appropriate absorption wavelength and can form a stable liquid-crystal liquid crystal phase.

As the dichroic dye, any of the dichroic dyes capable of forming a liquid-crystal liquid crystal phase known in the art can be used without limitation as long as they exhibit the above-mentioned characteristics.

One or more salts of dichroic anionic dyes represented by the formula {- chromium element} (- X _i O ^- M _i ⁺ ) _n , wherein the coloring material is a dye chromophore system, X _i is CO, SO ₂ , OSO ₂ or OPO ^- and (o M ^+), n is 1 to 10, M _i ⁺ is H ^+, M _H ⁺ and / or M _o ^+, M _H ⁺ is NH ₄ ^+, Li ^+, Na and ^{+, K +, Cs +,} 1 / 2Mg ++, 1 / 2Ca ++, 1 / 2Ba ++, 1 / 3Fe +++, 1 / 2Ni ++ or 1 / 2Co ⁺⁺ cations of inorganic type, M _o ⁺ is selected from N-alkylpyridinium, N-alkylquinolinium, N-alkylimidazolinium, N-alkylthiazolinium, OH- (CH ₂ -CH ₂ O) _m -CH ₂ CH ₂ -NH ₃ ⁺ (wherein, m is from 1 to 9), RR'H ₂ ^{+, +} R'RR''H, RR'R''R * N ^+, RR'R''R * P ⁺ (wherein, R, R ', R'' , R * is _{CH 3, ClC 2 H 4,} C 2 H 5, C 3 H 7, C 4 H 9, C 6 H 5 substituted or unsubstituted alkyl group, a substituted CH _2, etc. or unsubstituted phenyl or heteroaryl _{ring), YH- (CH 2 -CH 2} Y) k -CH 2 CH 2 ( in the above, and Y is O or NH, k is from 0 to 10)); (M _i ⁺ OX _i ^-) _{n {chromogenic} (- X j O-SAI} j) one or more of the amphoteric surfactant and / or a dichroic anionic dye with surface-active cation represented by _m aggregate (the in, X _j is CO, SO _2, OSO _2, and OPO (OM ^+), n is 0 to 9, m is 1 to 4, m _i ⁺ is H ^+, m _O ⁺ and / or m _H ⁺ , SAI _j (hereinafter surface active ion) is SAC ⁺ and / or AmSAS, SAC ⁺ is surface active cation and AmSAS is amphoteric surface active substance); At least one aggregate of a dichroic cationic dye having an amphoteric surfactant and / or a surface active anion represented by (M _i ⁺ O ^- X _i ^- ) n {color material} SAI wherein n is from 0 to 5 , SAI is SAA ^- and / or AmSAS, and SAA ^- is a surface active anion); One or more aggregates of a dichroic cationic dye having an amphoteric surfactant and / or a surface active anion represented by {color element} (- Z _i ⁺ RR 'R''AI _i ) _n , wherein Z _i is and N, P, R ', R ', R '' is _{CH 3, ClC 2 H 4,} HOC 2 H 4, and a substituted or unsubstituted alkyl group such as _{C 2 H 5, C 3 H} 7, SAI i is SAA ^- and / or AmSAS, and n is 1 to 4); ([{- chromogenic} (- X _i O ^- M ⁺ _{i) n]} ^-Li-) at least one salt of a dichroic anionic dye oligomer represented by _q (in the above, L is (CH _{2) 6,} C _{6 H 4, C 6 H 3} GC 6 H 3 G, C 6 H 3 GQC 6 H 3 G ( in the above, G is H, Hal, OH, and NH _2, Alk, Q is O, S, NH, CH ₂ , CONH, SO ₂ , NH-CO-NH, CH = CH, N = N, CH = N), n is 1 to 10, q is 5 to 10; And / or one or more water insoluble dichroic dyes having no inorganic or hydrophilic moieties. The dye may comprise the same ion exchanger, for example, OM _i -X _i ^+, _j -X-O SAI _j, -X _i ⁺ RR'R '' and / or M ⁺ _i, at the same time two May include several different ion groups and / or M _i ⁺ , including various members of the same group and / or cation, and the ion groups, -X _i OM _i ⁺ , -X _j O-SAI _j - X _i ⁺ RR'R "may be directly and / or bridged with an aromatic ring, for example -Q _i - (CH ₂ ) _p - wherein Q _i is SO ₂ NH, SO ₂ , CONH, CO, O , S, NH or CH ₂ , and p is 1 to 10).

The coloring material may be, for example, 1,4,5,8-naphthalene-, 3,4,9,10-perylene-, 3,4,9,10-anantron-tetracarboxylic acid, azo Dyes, azo dyes, metal complex dyes, azomethine dyes, styrene dyes or polymethine dye-based chromophore systems. In another example, the coloring material is selected from the group consisting of mono-, bis-, tris-, polyazo- or azoxy-dyes, stilbene, azomethine, thiopyrronine, pyronin, acridine, anthraquinone, perrinone, indigoid , Oxazine, aryloxycarbonyl, thiazine, xanthine or azine dyes, heterocyclic derivatives of di- and triarylmethanes, polycyclic or metal complex compounds, heterocyclic derivatives of anthrone, or mixtures thereof May be a chromophore system selected from one or more dichroic dyes or pigments selected from the group consisting of direct dyes, active dyes, acid dyes, polymethine dyes, cyanine dyes, hemicyan dyes, vat dyes and disperse dyes.

For the preparation of dyes of the type described above, for example, stilbene dyes disclosed in U.S. Patent No. 5,007,942 or U.S. Patent No. 5,340,504; Azo and metal complex dyes described in U.S. Patent No. 5,318,856; C.I. Direct Yellow 12, C.I. Direct Yellow 28, C.I. Direct Yellow 44, C.I. Direct Yellow 142, C.I. Direct Orange 6, C.I. Direct Orange 26, C.I. Direct Orange 39, C.I. Direct Orange 72, C.I. Direct orange 107, C.I. Direct Red 2, C.I. Direct Red 31, C.I. Direct Red 79, C.I. Direct Red 81, C.I. Direct Red 240, C.I. Direct Red 247, C.I. Direct Violet 9, C.I. Direct Violet 48, C.I. Direct Violet 51, C.I. Direct Blue 1, C.I. Direct Blue 15, C.I. Direct Blue 71, C.I. Direct Blue 78, C.I. Direct Blue 98, C.I. Direct Blue 168, C.I. Direct Blue 202, C.I. Direct Brown l06, C.I. Direct Brown 223, C.I. Direct dyes such as Direct Green 85; C.I. Active Yellow 1, C.I. Active Red 1, C.I. Active Red 6, C.I. Active Red 14, C.I. Active Red 46, C.I. Active violet 1, C.I. Active Blue 9, C.I. Active dyes such as Active Blue 10; C.I. Acid Orange 63, C.I. Acid Red 85, C.I. Acid Red 144, C.I. Acid Red 152, C.I. Acid Brown 32, C.I. Acid Violet 50, C.I. Acid Blue 18, C.I. Acid Blue 44, C.I. Acid Blue 61, C.I. Acid Blue 102, C.I. Acid dyes such as Acid Black 21; C.I. Basic Red 12, Basic Brown (CI 33500), C.I. Cationic dyes such as basic black and the like can be used.

The dichroic dye can be produced by a method known in, for example, International Patent Publication No. 1999-31535 or International Patent Publication No. 2000-067069.

In one example, the dichroic dye contained in the liquid crystal layer may be a dye represented by the following formula (1).

[Chemical Formula 1]

Wherein Q is a dye chromophore system, A is a single bond, an alkylene group having 1 to 12 carbon atoms or an alkylidene group having 1 to 12 carbon atoms, -SO ₂ NH-T-, -SO ₂ -T-, -CONH -T-, -CO-T-, -OT-, -ST- or -NH-T-, wherein T is an alkylene group or an alkylidene group having 1 to 10 carbon atoms, R is a salt- and n is the number of ARs bonded to Q,

In the dye chromophore system of the above formula 1, for example, a dye having a maximum absorption wavelength in the range of 350 nm to 900 nm, preferably 350 nm to 600 nm, more preferably 440 nm to 500 nm Chromophore system. The dye chromophore system may also be a chromophoric system having a molecular weight of from 300 g / mol to 900 g / mol, preferably from 450 g / mol to 800 g / mol, more preferably from 600 g / mol to 900 g / mol have.

In the formula (1), a single bond means that no atom exists in a portion denoted by A and Q and R are directly connected to each other. A is preferably a single bond, an alkylene group having 1 to 8 carbon atoms or an alkylidene group having 1 to 8 carbon atoms, more preferably a single bond, an alkylene group having 1 to 4 carbon atoms or an alkylene group having 1 to 4 carbon atoms An alkylidene group, and more preferably a single bond.

Further, the residue of a salt form in formula (I) are, for example, the residues contained in the above-described dichroic dye, for example, -X _i O ^- M ⁺ _i, and the like, and preferably -SO ₃ ^- M ⁺ or -COO ^- M ⁺ , wherein M ⁺ is H ⁺ ; ^{_{NH 4 +, Li +, Na}} +, K +, Cs +, 1 / 2Mg ++, 1 / 2Ca ++, 1 / 2Ba ++, 1 / 3Fe +++, 1 / 2Ni ++ or 1 / 2Co Inorganic cations such as ⁺⁺ ; Alkylpyridinium, N-alkylquinolinium, N-alkylimidazolinium, N-alkylthiazolinium, OH- (CH ₂ -CH ₂ O) _m -CH ₂ CH ₂ -NH ₃ ⁺ in, m is from 1 to ^{_{9), RR'H 2 +, RR'R''H}} +, RR'R''R * N +, RR'R''R * P + ( in the above, R, R ' , R '', R * is _{CH 3, ClC 2 H 4,} C 2 H 5, C 3 H 7, C 4 H 9, C 6 H 5 CH 2 substituted or unsubstituted alkyl group, a substituted or unsubstituted, such as the ring phenyl or heteroaryl) or _{YH- (CH 2 -CH 2 Y)} k -CH 2 CH 2 ( in the above, Y is O or NH, k may be a 0 to 10). The M ⁺ may preferably be an inorganic cation, more preferably Li ⁺ , Na ⁺ , K ⁺ or Cs ⁺ , more preferably Na ⁺ or Li ⁺ .

In Formula 1, n is preferably 1 to 5, more preferably 1 to 3.

The dichroic dye represented by the formula (1) is more preferably a compound represented by the following formula (2).

(2)

Wherein -U- is -N = N- or -O- (CH ₂ ) - (CHOH) - (CH ₂ ) - and X is independently an aryl group having 6 to 18 carbon atoms or a ring R ₁ is a hydroxy group, an alkoxy group having 1 to 12 carbon atoms, a haloalkyl group having 1 to 12 carbon atoms, an oxo group, or -N = N-Ph Wherein Ph is an alkoxy group having 1 to 12 carbon atoms or an unsubstituted phenyl group, l and m each independently represent 1 or 2, and p and q are each an integer of X each of a number of R ₁ substituted independently represent a number of 0-2.

The hetero atom contained in the heteroaryl group as a ring constituting atom in the above may be, for example, N or O, preferably N. [ The heteroatoms in the ring atoms of the heteroaryl group may be, for example, 1 to 5, preferably 1 to 3, more preferably 1 to 2 heteroatoms.

In Formula 2, -U- may preferably be -N = N-, and X is preferably an aryl group having 6 to 12 carbon atoms or a heteroaryl group having 6 to 12 ring-constituting atoms, more preferably 6 or more carbon atoms And R ₁ is preferably a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms, a haloalkyl group having 1 to 8 carbon atoms, an oxo group or -N = N-Ph wherein Ph is at least one carbon number More preferably a hydroxy group, an alkoxy group having 1 to 4 carbon atoms, a haloalkyl group having 1 to 4 carbon atoms, an oxo group or -N = N-Ph (in the above formula Ph is a phenyl group substituted with at least one alkoxy group having 1 to 4 carbon atoms or unsubstituted phenyl group), l and m are more preferably 1, and p and q are each independently 0 or 1 Lt; / RTI > Examples of the halogen which may be substituted on the haloalkyl group include chlorine and fluorine.

The characteristics of the dye and the liquid-crystal liquid crystal composition can be particularly effectively controlled in the case of a dye having two or more ionic groups. In this case it is possible to use two or more different cations, each cation providing their own properties, or other properties. For example, a combination of Li ⁺ cations that provide increased solubility and three ethanol ammonium cations that decrease the cohesion of dye molecules and tetra-butylammonium cations that stabilize the liquid-crystal liquid crystal phase can be used to form single molecules and / (Complexes) with molecular dyes having a high degree of crystallinity. The dye has a linear molecular structure to promote the formation of a nematic liquid crystal liquid crystal phase and provide a higher degree of orientation by the formation of a liquid crystal layer, and as a result, can provide more effective selective transmission and reflection of the electron beam.

Addition of polyvalent cations such as 1 / 2Mg ⁺⁺ , 1 / 2Ca ⁺⁺ , 1 / 2Ba ⁺⁺ increases the degree of coagulation in the molecular complex and increases the degree of coagulation, for example, To form a liquid crystal liquid phase of the complex, and its solubility can be increased by the use of a surface active ion.

The liquid-crystal liquid crystal composition is characterized in that one random mutual position of the dye molecules or supramolecular complexes is rendered impossible and the concentration of the diluting liquid to the required concentration, which must have an ordered LC state, for example by evaporation or membrane superfiltration Or a mixture of water, water / alcohol, a bipolar aprotic solvent (for example, dimethyl formamide (DMFA), dimethyl sulfoxide (DMSO), cellosolve, ethyl acetate and other solvents miscible with water ), And the like, may be obtained from either an aqueous solution, an aqueous-organic solution, or an organic solution of a suitable dye by dissolving the dry dye in a suitable solvent. At this concentration, the concentration of the dye in the liquid-crystal liquid crystal composition is selected within the range of 0.5 wt% to 30 wt%, preferably about 0.5 wt% to 20 wt%, more preferably about 0.5 wt% to 15 wt% .

In order to control the colloid-chemical properties of the liquid crystal liquid, the composition may contain, in addition to the solvent, additives and modifiers such as nonionic and ionic surfactants, binders and film forming reactants (polyvinyl alcohol, polyvinylpyrrolidone, Polyacrylic acid and its ethers, polyacrylamides, polyethylene oxide and polyethylene glycols, polypropylene glycols and copolymers thereof, ethyl- and hydroxypropyl ethers of cellulose, sodium salts of carboxymethylcellulose, and the like). The composition may further comprise additives from the amide family, such as hydrotropic additives such as dimethylformamide, dimethylsulfoxide, alkylamides of phosphoric acid, carbamides and N-substituted derivatives thereof, N-alkylpyrrolidones, Amides and mixtures thereof, and mixtures of amides and glycols. The use of suitable additives not only increases the stability of the composition but also makes it possible to control the aggregation process of dye molecules and consequently to control the formation process of liquid crystal liquid crystals. Thus, the addition of a hydrotropic additive enables the preparation of liquid-crystal liquid crystal compositions of a single dye molecule.

The liquid crystal layer may further contain stabilizers of different types of light, hydrophilic and / or hydrophobic polymers, including up to 50% by weight of modifiers such as liquid crystal, silicone, plasticizer, lacquer, nonionic, .

For the formation of the liquid crystal layer, a locally aligned liquid crystal liquid crystal composition may be deposited on the surface of the substrate by a method known in, for example, U.S. Patent No. 5,739,296. Under the influence of an external orientation effect, the liquid-crystal liquid crystal composition can be used in a direction in which the dipole moments of the optical transition dye molecules or their anisotropic absorption segments are set by mechanical orientation or surface anisotropy, It is possible to take a macroscopic orientation that is homogeneously oriented with respect to the substrate. For example, the orientation of the molecules during the solidification process, such as removal of the solvent or reduction in temperature, is not only well preserved but also increases due to crystallization.

In another example, the orientation of the liquid-crystalline liquid crystal composition on the substrate surface under the action of a shear force may be realized by deposition of a composition using a doctor blade, which may be a die or knife blade or a cylindrical blade. One method of preparing a dye-based liquid crystal layer of one of the different cation-containing forms provides for the treatment of a layer formed of a barium, calcium or magnesium chloride solution. By this treatment, a liquid crystal layer simultaneously containing cations such as lithium, sodium, potassium, ammonium, ammonium ammonium, alkylammonium, barium, calcium or magnesium can be produced.

The liquid crystal layer may further include a solvent, for example, an organic solvent having a high boiling point, etc., so as to be suitably applied to the transmittance controlling method described later.

The present application is also directed to a display device. An exemplary display device may include the polarizing element.

The specific kind of the display device including the polarizing element is not particularly limited. The device may be, for example, a liquid crystal display device such as a reflection type or transflective type liquid crystal display (LCD), an organic light emitting display (OLED), or the like.

In the display device, the arrangement of the polarizing elements is not particularly limited, and for example, a known configuration may be employed. For example, in a reflection type liquid crystal display, the polarizing element can be used as any one of the polarizing plates of the liquid crystal panel in order to prevent the external light from being reflected and to ensure visibility. Also, in the organic light emitting display device, the polarizing element may be disposed outside the electrode layer of the OLED in order to prevent reflection of external light and ensure visibility.

1: Polarizer
2: liquid crystal layer
3: phase delay layer

Claims (10)

A polarizing element comprising a polarizer and a liquid crystal layer disposed on one side of the polarizer, the liquid crystal layer including a dichroic yellow dye capable of forming a liquid crystal liquid crystal phase. The polarizing element according to claim 1, wherein the transmittance is 40% or more. The polarizing element according to claim 1, wherein the polarization efficiency is 98% or more. 4. A polarizing element according to claim 3, wherein the projection of the optical transit dipole moments of the dichroic dye or of the moment onto the plane of the polarizer is parallel or perpendicular to the absorption axis of the polarizer. 2. The polarizing element according to claim 1, wherein the dichroic dye is represented by the following formula (1)
[Chemical Formula 1]

A is a single bond, an alkylene group having 1 to 12 carbon atoms or an alkylidene group having 1 to 12 carbon atoms, -SO ₂ NH-T-, -SO ₂ -T-, - CONH-T-, -CO-T-, -OT-, -ST- or -NH-T-, wherein T is an alkylene or alkylidene group having 1 to 10 carbon atoms, R is a salt- , and n is the number of AR groups bonded to Q, The method of claim 5, wherein the residue R in salt form, -SO ₃ ^- M ⁺ or -COO ^- M ^+, and the polarizing element in the M ⁺ is an inorganic cation. 2. The polarizing element according to claim 1, wherein the dichroic dye is represented by the following formula (2)
(2)

In Formula 2 is -U-, -N = N- or _{-O- (CH 2) - (CHOH} ) - (CH 2) -O- , X is, each independently represent an aryl group having 6 to 18 carbon atoms or R ₁ is a hydroxyl group, an alkoxy group having 1 to 12 carbon atoms, a haloalkyl group having 1 to 12 carbon atoms, an oxo group, or -N = N-Ph Wherein Ph is an alkoxy group having 1 to 12 carbon atoms or an unsubstituted phenyl group, l and m each independently represent 1 or 2, and p and q are The number of R ₁ substituted on X is independently 0 to 2. The polarizing element according to claim 1, further comprising a quarter-wave retardation layer disposed below the liquid crystal layer. A display device comprising the polarizing element of claim 1. 10. The display device according to claim 9, wherein the liquid crystal display device or the organic light emitting display device

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