KR20170064860A - Composition for optical film and film and display device - Google Patents

Abstract

A composition for an optical film comprising a vertically oriented liquid crystal, a silane or germanium compound containing at least one fluorine at the terminal, and a polymerizable compound; An optical film comprising a substrate and a liquid crystal layer disposed on one side of the substrate and including a vertically-oriented liquid crystal, a silane or germanium compound containing at least one fluorine at the terminal, and a polymer; A compensation film comprising the optical film; An antireflection film comprising the optical film; And a display device including the optical film, the compensation film or the antireflection film.

Description

TECHNICAL FIELD [0001] The present invention relates to a composition for an optical film,

A composition for an optical film, a film, and a display device.

 A display device mainly used at present can be divided into a light emitting display device which emits light by itself and a light receiving display device which requires a separate light source and a compensation film such as a retardation film is often used as a method for improving the image quality.

In the case of a light emitting display device, for example, an organic light emitting display (OLED), visibility and contrast ratio may be lowered due to reflection of external light by a metal such as an electrode. In order to reduce this, it is possible to prevent the external light reflected by the organic light emitting display device from leaking out by changing the linearly polarized light to circularly polarized light by using the polarizer and the compensation film.

A liquid crystal display (LCD), which is a light-receiving type display device, can compensate a phase difference generated by a liquid crystal using a compensation film, thereby securing a wide viewing angle.

The compensation film may be a single layer optical film or a combination of plural layers of optical films. As an example of the optical film, there is a method of applying a liquid crystal film to one surface of an alignment film and controlling the orientation of the liquid crystal. However, this requires not only a separate alignment film formation process but also a process of optically treating the surface of the alignment film such as rubbing or optical alignment in order to control alignment of the liquid crystal. In this case, the process is complicated and it is difficult to secure the orientation uniformity.

One embodiment provides a composition for an optical film that can implement an optical film without an orientation film.

Another embodiment provides an optical film capable of realizing liquid crystal alignment without an alignment film.

Another embodiment provides a compensation film comprising the optical film.

Another embodiment provides an antireflection film comprising the compensation film.

Another embodiment provides a display device to which the optical film, the compensation film, or the antireflection film is applied.

One embodiment provides a composition for an optical film comprising a homeotropic liquid crystal, a silane or germanium compound comprising at least one fluorine at the end, and a polymerizable compound.

The silane or germanium compound may be represented by the following general formula (1).

[Chemical Formula 1]

In Formula 1,

Y is Si or Ge,

R ¹ to R ³ , R ⁵ and R ⁶ are each independently hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C1 to C20 alkoxy A substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkoxyalkyl group, a substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkanoyloxy group, a substituted or unsubstituted C1 to C20 alkanoylalkyl group, A substituted or unsubstituted C1 to C20 alkanoyloxyalkyl group, a hydroxy group or a combination thereof,

L is a single bond, a substituted or unsubstituted C1 to C12 alkylene group, a substituted or unsubstituted C1 to C12 heteroalkylene group, a substituted or unsubstituted C7 to C30 alkylarylene group or a substituted or unsubstituted C7 to C30 arylalkyl Rengi,

R ⁴ is fluorine, a C1 to C3 fluoroalkyl group or a C1 to C3 fluoroalkoxy group,

n is an integer of 0 to 4;

The vertically aligning liquid crystal may be represented by the following formula (A).

(A)

(P ¹ - S ¹ - X ¹ ) _n ¹ - MG - (X ² - S ² - P ² ) _n ²

In the above formula (A)

MG is a mesogen group,

X ¹ and X ² are each independently a single bond, -O-, -S-, -C (═O) -, -C (═O) O-, -O (C═O) = O) O-, any one of the following (a) to (k)

S ¹ and S ² are each independently a single bond or a substituted or unsubstituted C1 to C30 spacer group,

P ¹ and P ² are each independently a polymerizable functional group,

n ¹ and n ² are each independently 0 or 1, provided that n ¹ and n ² are not simultaneously 0.

The polymerizable compound may be represented by the following formula (C).

≪ RTI ID = 0.0 &

_{^{(P 3 - (CH 2)}} s1) T1 -CR (3-T1) - (CH 2) q1 -O- (CH 2) q2 -CR (3-T2) - ((CH 2) s2 - P ⁴ ) _T2

In formula (C) above,

R is hydrogen or a methyl group,

P ³ and P ⁴ are each independently a polymerizable functional group,

S1, S2, q1 and q2 are each independently 0 or 1,

T1 and T2 are independently 2 or 3, respectively.

The polymerizable compound may include a compound having 4 to 10 acryloyl groups or acrylate groups.

The composition for an optical film may further comprise a solvent and may contain about 5 to 50 wt% of the vertically oriented liquid crystal, about 0.1 to 1.1 wt% of the silane or germanium compound, about 1 to 10 wt% % By weight of the polymerizable compound, and a balance of the solvent.

The composition for an optical film may further comprise a photoinitiator.

The photoinitiator may be included in an amount of about 0.1 to 2% by weight based on the total amount of the composition.

According to another embodiment, there is provided a liquid crystal display comprising a substrate and a liquid crystal layer located on one side of the substrate, wherein the liquid crystal layer comprises a vertically oriented liquid crystal, a silane or germanium compound containing at least one fluorine at the terminal, .

The silane or germanium compound may be represented by the general formula (1).

The vertically aligning liquid crystal may be arranged in a direction substantially perpendicular to the longitudinal direction of the substrate, and the silane or germanium compound may be arranged in a direction parallel to the vertically aligning liquid crystal.

The polymer may be located between the vertically oriented liquid crystals.

The in-plane retardation (R ₀ ) of the liquid crystal layer with respect to incident light having a wavelength of 550 nm may be ₀ nm? R ₀ ? 1 nm.

The absolute value of retardation (R _th) in the thickness direction of the liquid crystal layer to the incident light of a wavelength of 550nm may be 50nm≤R _th ≤300nm.

The liquid crystal layer may have a refractive index satisfying the following relational expression (1).

[Relation 1]

n _z > n _x = n _y

In the above formula 1,

n _x is a refractive index in the slow axis (slow axis) of the liquid crystal layer, n _y is a refractive index in the fast axis (fast axis) of the liquid crystal layer, n _z is a refractive index in the direction perpendicular to n _x and n _y to be.

An orientation film may not be interposed between the substrate and the liquid crystal layer.

According to another embodiment, there is provided a compensation film comprising the optical film and a retardation film located on at least one side of the optical film.

The retardation film may include a? / 4 retardation film, a? / 2 retardation film, or a combination thereof.

According to another embodiment, there is provided an antireflection film comprising the compensation film and a polarizer positioned on one side of the compensation film.

According to another embodiment, there is provided a display panel, and a display device including the optical film, the compensation film or the antireflection film.

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

The vertical alignment property of the liquid crystal can be ensured without the orientation film, thereby simplifying the production process of the film and improving the orientation uniformity. Further, an optical film capable of performing a compensation function can be effectively realized by securing the vertical alignment of the liquid crystal.

1 and 2 are sectional views showing an optical film according to one embodiment,
3 is a cross-sectional view schematically illustrating a compensation film according to an embodiment,
4 is a cross-sectional view schematically showing a compensation film according to another embodiment,
5 is a cross-sectional view schematically showing an antireflection film according to one embodiment,
FIG. 6 is a schematic view showing an external light anti-reflection principle of an anti-reflection film according to one embodiment,
7 is a cross-sectional view schematically showing an organic light emitting diode display according to an embodiment,
8 is a cross-sectional view schematically showing a liquid crystal display device according to one embodiment,
9 to 24 are graphs showing the retardation curves of the films according to Examples 1 to 12 and Comparative Examples 1 to 5, respectively,
25 is a photograph of the film according to Example 1 observed using a polarizing microscope,
26 is a photograph of the film according to Example 11 observed using a polarizing microscope,
27 is a photograph of the film according to Comparative Example 1 observed using a polarizing microscope,
28 is a photograph of a film according to Comparative Example 2 observed using a polarizing microscope,
29 is a photograph of a film according to Comparative Example 3 observed using a polarizing microscope,
30 is a photograph of the film of Comparative Example 4 observed using a polarizing microscope,
31 is a photograph of a film according to Comparative Example 5 observed using a polarizing microscope.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the embodiments may be embodied in various different forms and are not limited to the embodiments described herein.

Unless otherwise defined herein, "substituted" means that the hydrogen atom in the compound is a halogen atom (F, Br, Cl or I), a hydroxy group, a C1 to C20 alkoxy group, a cyano group, an amino group, a C1 to C20 ester group Substituted with a substituent selected from a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C6 to C20 aryl group, a C3 to C20 heteroaryl group, and combinations thereof.

Hereinafter, a composition for an optical film according to one embodiment will be described.

The composition for an optical film according to an embodiment includes a liquid crystal, a silane or germanium compound containing at least one fluorine at the terminal, and a polymerizable compound.

The liquid crystal may be a monomer having a rod shape, an oligomer and / or a polymer, for example, a homeotropic liquid crystal in which the long axis direction of the liquid crystal is oriented perpendicular to the surface of the substrate.

The liquid crystal may be a reactive mesogen liquid crystal and may have, for example, at least one polymerizable functional group. The reactive mesogen liquid crystal may be, for example, a rod-like aromatic derivative having at least one polymerizable functional group, propylene glycol 1-methyl, propylene glycol 2-acetate and P ¹ -A ¹ - (Z ¹ -A ² ) _n -P ² Wherein P ¹ and P ² are each independently a polymerizable functional group and are independently selected from the group consisting of acrylate, methacrylate, acryloyl, methacryloyl, vinyl, vinyloxy, epoxy or combinations thereof, wherein A ¹ and A ² are each independently 1,4-phenylene, naphthalene-2,6- Diyl group or a combination thereof and Z ¹ is a single bond, -O-, -S-, -C (= O) -, -C (= O) O-, -O = O) -, -O (C = O) O-, or a combination thereof, and n is 0, 1 or 2.

The reactive mesogen liquid crystal may include, for example, a compound represented by the following formula (A).

(A)

(P ¹ - S ¹ - X ¹ ) _n ¹ - MG - (X ² - S ² - P ² ) _n ²

In the above formula (A)

MG is a bar-shaped mesogenic group,

X ¹ and X ² are each independently a single bond, -O-, -S-, -C (= O) -, -C (= O) O-, = O) O-, any one of the following (a) to (k)

S ¹ and S ² are each independently a single bond or a substituted or unsubstituted C1 to C30 spacer group,

P ¹ and P ² are each independently a polymerizable functional group,

n ¹ and n ² each independently may be 0 or 1, but n ¹ and n ² are not simultaneously 0.

), 알레닐렌기(

), 또는 이들의 조합을 가질 수 있다. For example, the MG of formula (A) may contain at least one substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted heterocycloalkyl group, an acetylrenylene group

), Alenylene group (

), Or a combination thereof.

For example, the MG of formula (A) may be represented by the following formula (B), but is not limited thereto.

[Chemical Formula B]

- (A ¹ - Z ¹ ) _m - A ² --Z ² - A ³ -

In the above formula (B)

A ¹ , A ² and A ³ each independently represents a substituted or unsubstituted 1,4-phenylene group, a substituted or unsubstituted 1,4-cyclohexylene group, a substituted or unsubstituted 1,4-cyclohexenyl A substituted or unsubstituted naphthalene-2,6-diyl group,

Z ¹ and Z ² are each independently a single bond, -O-, -S-, -C (═O) -, -C (═O) O-, = O) O-, - (CH 2) p1 -, -O (CH 2) p2 -, - (CH 2) p3 O-, -CH = CH-, -C = C-, -CH = CH-C (O) O-, - (O = C) O-CH = CH- or combinations thereof, wherein p1, p2 and p3 each independently may be 1 to 12,

m may be 0, 1 or 2;

For example, S ¹ and S ² in Formula A may each independently be a single bond or a substituted or unsubstituted C1 to C20 alkylene group, but the present invention is not limited thereto.

In one embodiment, each of P ¹ and P ² of the formula (A) independently represents a _{CH 2 = CH-C (=} O) O-, CH 2 = CCH 3 -C (= O) O-, CH 2 = CCl-C ( _{= O) O-, CH 2 =} CH-O-, C (CH 3) H = CH-O-, CHCl = CH-O-, CH 2 = CH-Ph-, CH 2 = CH-Ph-O- (Ph is a substituted or unsubstituted phenylene group), or a combination thereof, but is not limited thereto.

The reactive mesogen liquid crystal may be exposed to heat or light to perform the reaction of the polymerizable functional group, and the light may be, for example, ultraviolet light having a wavelength of about 250 nm to 400 nm.

The liquid crystal may be a single kind of liquid crystal or two or more kinds of mixed liquid crystal.

The liquid crystal may be included in an amount of about 5 to 50% by weight based on the total amount of the composition. And may be included in the range of about 5 to 40% by weight and within the range of about 10 to 30% by weight. By being included in the above range, the optical characteristics of the optical film can be secured more effectively.

The silane or germanium compound may be a monomer containing at least one fluorine at the end, for example, a silane coupling agent.

The silane or germanium compound may be, for example, a compound represented by the following general formula (1).

[Chemical Formula 1]

In Formula 1,

Y is Si or Ge,

R ¹ to R ³ , R ⁵ and R ⁶ are each independently hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C1 to C20 alkoxy A substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkoxyalkyl group, a substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkanoyloxy group, a substituted or unsubstituted C1 to C20 alkanoylalkyl group, A substituted or unsubstituted C1 to C20 alkanoyloxyalkyl group, a hydroxy group or a combination thereof,

L is a single bond, a substituted or unsubstituted C1 to C12 alkylene group, a substituted or unsubstituted C1 to C12 heteroalkylene group, a substituted or unsubstituted C7 to C30 alkylarylene group or a substituted or unsubstituted C7 to C30 arylalkyl Rengi,

R ⁴ is fluorine, a C1 to C3 fluoroalkyl group or a C1 to C3 fluoroalkoxy group,

n is an integer of 0 to 4;

For example, each of R ¹ to R ³ , R ^5, and R ⁶ may be independently a substituted or unsubstituted C1 to C20 alkyl group or a substituted or unsubstituted C1 to C20 alkoxy group. For example, each of R ¹ to R ³ may independently be a methyl group, an ethyl group, a propyl group, a methoxy group, an ethoxy group, or a propoxy group. For example, the alkyl group or the alkoxy group may not be substituted with fluorine.

In one example, L may be a substituted or unsubstituted C1 to C12 alkylene group. For example, L may be a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group or a hexylene group. For example, the alkylene group may not be substituted with fluorine.

For example, R ⁴ may be a monofluoromethyl group, a difluoromethyl group or a trifluoromethyl group.

The silane or germanium compound represented by Formula 1 may include a fluorine-containing moiety at the end and may be arranged perpendicular to the substrate by having affinity or half affinity to the substrate by the fluorine-containing moiety. The substrate may include, for example, a glass substrate, a metal substrate, a semiconductor substrate, or a polymer substrate, and the polymer substrate may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polyvinyl alcohol (PVA), polycarbonate (PC), triacetylcellulose TAC), derivatives thereof, and / or combinations thereof.

For example, when the substrate is a glass having a low surface energy, the fluorine-containing portion of the silane or germanium compound may have a semi-affinity for the substrate such that the fluorine-containing portion is located on the opposite side of the substrate, . For example, when the substrate is a polymer substrate having a low surface energy, the fluorine-containing portion of the silane or germanium compound may have an affinity for the substrate so that the fluorine-containing portion is vertically arranged on the substrate side.

Thus, the silane or germanium compound can be arranged in a direction perpendicular to the surface of the substrate to be positioned side by side between the vertically aligning liquid crystals described above, thereby supporting and enhancing the orientation of the vertically aligning liquid crystals. Therefore, the vertical alignment property of the liquid crystal can be ensured directly on the substrate without a separate alignment film.

In Formula 1, n may be an integer of 0 to 4. For example, in Formula 1, n may be 0, 1, 2, 3 or 4. When n = 0, the silane or germanium compound represented by the formula (1) may be represented by the following formula (2).

(2)

Wherein Y, L, R ¹ , R ² , R ³ and R ⁴ are as defined in formula (1).

When Y is silicon, the compound represented by Formula 2 may be represented by Formula 3 below.

(3)

In Formula 3, L, R ¹ , R ² , R ³ and R ⁴ are as defined in Formula (1).

The silane compound containing at least one fluorine at the end may be a fluorinated cyclotrisiloxane compound. The fluorinated cyclotrisiloxane compound can be obtained, for example, from a compound having one fluorinated group represented by the following formula (4), a compound having two fluorinated groups represented by the following formula (5), and a compound having three fluorinated groups represented by the following formula Can be selected.

[Chemical Formula 4]

In Formula 4,

R ⁷ may be the same as defined for R ⁴ in formula (1), R ⁸ to R ¹² may be the same as defined for R ¹ to R ³ in formula (1), and L 'may be the same as defined for L in formula (1).

[Chemical Formula 5]

In Formula 5,

R ⁷ and R ⁸ may be the same as defined for R ⁴ in formula (1), R ⁹ to R ¹² may be the same as defined for R ¹ to R ³ in formula (1), and L ' .

[Chemical Formula 6]

In Formula 6,

R ⁷ to R ⁹ may be the same as defined for R ⁴ in formula (1), R ¹⁰ to R ¹² may be the same as defined for R ¹ to R ³ in formula (1), and L ' .

The silane or germanium compound may be, for example, (3,3,3-trifluoropropyl) trimethoxysilane, (3,3,3-trifluoropropyl) methyldichloro (3,3,3-trifluoropropyl) methyldichlorosilane, (3,3,3-trifluoropropyl) methyldimethoxysilane, (3,3,3- (3,3,3-trifluoropropyl) methyldiethoxysilane, (3,3,3-trifluoropropyl) trichlorosilane, (3,3,3-trifluoropropyl) trichlorosilane, , (3,3,3-trifluoropropyl) trimethoxysilane) ((3,3,3-trifluoropropyl) trimethoxysilane) or (3,3,3-trifluoropropyl) triethoxysilane ( , 3,3-trifluoropropyl) triethoxysilane), but is not limited thereto.

The silane or germanium compound may be included in an amount of about 0.1 to 5% by weight based on the total amount of the composition. And may be included in the range of about 0.1 to 3% by weight and within the range of about 0.1 to 1.1% by weight. By being included in the above range, it is possible to more effectively support and enhance the orientation of the vertically aligning liquid crystals.

The polymerizable compound may be a photopolymerizable monomer, a photopolymerizable oligomer, a thermosetting monomer and / or a thermoplastic oligomer capable of causing a polymerization reaction by light or heat. The polymerizable compound is not particularly limited as long as it has at least one polymerizable functional group, and examples thereof include an acrylate group, a methacrylate group, an acryloyl group, a methacryloyl group, a vinyl group, a vinyloxy group, an epoxy group, It may include, for example, _{CH 2 = CH-C (=} O) O-, CH 2 = CCH 3 -C (= O) O-, CH 2 = CCl-C (= O) O-, CH 2 = CH _{-O-, C (CH 3) H} = CH-O-, CHCl = CH-O-, CH 2 = CH-Ph-, CH 2 = CH-Ph-O- (Ph is a substituted or unsubstituted phenylene group Or combinations thereof, but is not limited thereto. For example, the polymerizable compound may have an acryloyl group or an acrylate group at the terminal, and may have, for example, 4 to 10 acryloyl groups or acrylate groups.

The polymerizable compound may be, for example, a compound represented by the following formula (C), but is not limited thereto.

≪ RTI ID = 0.0 &

_{^{(P 3 - (CH 2)}} s1) T1 -CR (3-T1) (CH 2) q1 -O- (CH 2) q2 -CR (3-T2) - ((CH 2) s2 - P ⁴ ) _T2

In formula (C) above,

R is hydrogen or a methyl group,

P ³ and P ⁴ each is a polymerizable functional group, such as _{CH 2 = CH-C (=} O) O-, CH 2 = CCH 3 -C (= O) O-, CH 2 = CCl-C (= O) O-, CH ₂ ═CH-O-, C (CH ₃ ) H═CH-O-, CHCl═CH-O-, CH ₂ ═CH-Ph-, CH ₂ ═CH-Ph- A substituted or unsubstituted phenylene group, or a combination thereof,

S1, S2, q1 and q2 each independently may be 0 or 1,

T1 and T2 are independently 2 or 3, respectively.

The polymerizable compound may be exposed by light or heat to perform the reaction, and the light may be ultraviolet light having a wavelength of about 250 nm to 400 nm, for example.

Wherein the polymer obtained by the reaction of the polymerizable compound enhances the bonding force between the vertically aligning liquid crystals, between the substrate and the vertically aligning liquid crystal and between the vertically aligning liquid crystal and the silane or germanium compound to support and fix the vertically- Can act as a matrix. Therefore, it is possible to support and enhance the orientation of the vertically aligning liquid crystals on the substrate, and thus, together with the silane or germanium compound, to ensure the vertical alignment of the liquid crystal directly above the substrate without a separate alignment film.

The polymerizable compound may be included in an amount of about 0.1 to 10% by weight based on the total amount of the composition. And may be included in the range of about 0.5 to 10% by weight and within the range of about 1 to 10% by weight. By being included in the above range, it can be used together with the silane or germanium compound to more effectively support and enhance the orientation of the vertically aligning liquid crystals.

In one example, the vertically oriented liquid crystal, the silane or germanium compound, and the polymerizable compound may each comprise about 5 to 50 wt%, about 0.1 to 5 wt%, and about 0.1 to 10 wt%, based on the total amount of solids .

In one example, the vertically oriented liquid crystal, the silane or germanium compound, and the polymerizable compound may each comprise about 5 to 50 wt%, about 0.1 to 3 wt%, and about 1 to 10 wt%, based on the total solid content .

In one embodiment, the vertically oriented liquid crystal, the silane or germanium compound, and the polymerizable compound may be included in an amount of about 5 to 50 wt%, 0.1 to 1.1 wt%, and 1 to 10 wt%, respectively, based on the total solid content.

The composition may further comprise a reaction initiator. The reaction initiator can be, for example, a photoinitiator and can be, for example, a free radical thermal initiator, a photoinitiator and / or an ionic photoinitiator.

Thermal initiators include, for example, 4,4-azobis (4-cyanovaleric acid), 1,1'-azobis (cyclohexanecarbonitrile) (1,1- an azo compound such as 2,2'-azobisisobutyronitrile (AIBN), or azo compounds such as 2,2'-azobisisobutyronitrile (AIBN); Ammonium persulfate, inorganic peroxides such as hydroxymethanesulfinic acid monosodium salt dehydrate; hydroxymethanesulfinic acid monosodium salt dehydrate; Sodium or potassium persulfate; Benzoyl peroxide, 2,2-bis (tert-butylperoxy) butane, 1,1-bis (t-butylperoxy) cyclohexane (Tert-butylperoxy) cyclohexane, 2,5-bis (tert-butylperoxy) -2,5-dimethylhexane, , 2,5-bis (tert-butylperoxy) -2,5-dimethyl-3-hexyne, bis (1- (tert-butylperoxy) -1-methylethyl) benzene, 1,1-bis (t-butylperoxy) -3,3,5 Butyl tert-butylperoxy-3,3,5-trimethylcyclohexane, tert-butyl hydroperoxide, tert-butyl peracetate, tert-butyl peroxide, tert-butyl peroxybenzoate, tert-butylperoxy isopropyl carbonate, cumene hydroperoxide, hydroperoxide, Cyclohexanone peroxide, dicumyl peroxide, lauroyl peroxide, 2,4-pentanedione peroxide, and peracetic acid. But are not limited to, organic peroxides.

Photoinitiators include benzoin and derivatives thereof such as benzoin ethyl ether, benzoin isobutyl ether or benzoin methyl ether; Benzyl ketal; 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 4'-ethoxyacetophenone (4 ' -ethoxyacetophenone, 3'-hydroxyacetophenone, 4'-hydroxyacetophenone, and derivatives thereof; Benzophenones and derivatives thereof such as 3-hydroxybenzophenone, 4-hydroxybenzophenone and 4'-phenoxyacetophenone; Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, and the like, but the present invention is not limited thereto.

The reaction initiator may be included in an amount of about 0.01 to 5% by weight based on the total amount of the composition. And may be included in the range of about 0.1 to 4% by weight and within the range of about 0.1 to 2% by weight. By being included in the above range, the reactivity can be effectively increased.

The composition may further comprise additives. The additive may be, but is not limited to, a surfactant, dissolution aid and / or dispersant.

The composition may further comprise a solvent capable of dissolving and / or dispersing the aforementioned components. The solvent is not particularly limited as long as it can dissolve and / or disperse the above-mentioned components and does not cause physical and chemical damage to the substrate. Examples of the solvent include deionized water, methanol, ethanol, propanol, isopropanol, 2-methoxyethanol, 2- Ethoxyethanol, 2-propoxyethanol 2-butoxyethanol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, diethylene glycol methyl ether, diethylene glycol ethyl ether, dipropylene glycol methyl ether, toluene, xylene Propyleneglycol methyl ether, propyleneglycol methyl ether, propyleneglycol methyl ether, propyleneglycol methyl ether, propyleneglycol methyl ether, propyleneglycol methyl ether, propyleneglycol methyl ether, propyleneglycol methyl ether, Propylene glycol propyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene (DMF), N, N-dimethylacetamide (DMAc), N-methylpyrrolidone (NMP), and the like. Diethyl ether, ethylene glycol dimethyl ether, diglyme, tetrahydrofuran, acetylacetone, acetonitrile, chloroform, dichloromethane, tetrachloroethane, trichlorethylene, tetrachloroethane, At least one selected from ethylene, chlorobenzene, benzene, toluene and xylene. The solvent may be a single solvent and may be mixed daily.

The solvent may be included in the total amount of the composition excluding the above-mentioned components.

The composition can be applied onto a substrate, dried and prepared in the form of a film.

The substrate may include, for example, a glass substrate, a metal substrate, a semiconductor substrate, or a polymer substrate, and the polymer substrate may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polyvinyl alcohol (PVA), polycarbonate (PC), triacetylcellulose TAC), derivatives thereof, and / or combinations thereof.

The composition can be applied by a solution process such as spin coating, slit coating and / or ink jet, and the thickness can be adjusted in consideration of the refractive index of the film and the like.

The coated composition may be dried, for example, at a temperature above the boiling point of the solvent.

As described above, the composition includes the above-described silane or germanium compound and a polymerizable compound, so that the orientation of the vertically aligning liquid crystal can be secured and enhanced without using an alignment film on the substrate. Therefore, not only the production process of the film is simplified, but also the alignment uniformity can be ensured irrespective of the surface state of the alignment film, and good optical characteristics can be exhibited.

Hereinafter, an optical film formed from the composition will be described with reference to the drawings.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. Whenever a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

1 and 2 are sectional views showing an optical film according to one embodiment.

1 and 2, an optical film 100 according to one embodiment includes a substrate 110 and a liquid crystal layer 120 disposed on one side of the substrate 110. [

The substrate 110 may include, for example, a glass substrate, a metal substrate, a semiconductor substrate, or a polymer substrate. The polymer substrate may be a substrate made of, for example, polyethylene terephthalate (PET), polyvinyl alcohol (PVA), polycarbonate (PC), triacetylcellulose (TAC), derivatives thereof and / It is not. When the optical film 100 includes a different kind of lower film than the substrate 100, the substrate 100 may be the lower film.

The liquid crystal layer 120 includes a liquid crystal 12a, a silane or germanium compound 12b containing at least one fluorine at the terminal, and a polymer 12c.

The liquid crystal 12a may be a rod-shaped monomer, an oligomer and / or a polymer, and may be a vertically aligning liquid crystal in which the long axis direction of the liquid crystal 12a is oriented perpendicular to the surface of the substrate 110. [

The liquid crystal 12a may be a reactive mesogen liquid crystal, and may include a reactive mesogen liquid crystal having at least one polymerizable functional group and / or a polymerization product thereof.

The reactive mesogen liquid crystal may be, for example, a rod-like aromatic derivative having at least one polymerizable functional group, propylene glycol 1-methyl, propylene glycol 2-acetate and P ¹ -A ¹ - (Z ¹ -A ² ) _n -P ² Wherein P ¹ and P ² are polymerizable functional groups and may each independently comprise an acrylate group, a methacrylate group, an acryloyl group, a vinyl group, a vinyloxy group, an epoxy group, or a combination thereof, and A ¹ and A ² may each independently comprise 1,4-phenylene, naphthalene-2,6-diyl group or a combination thereof, and Z ¹ represents a single bond, -O-, -S-, -C (O = C) O-, -O (C = O) O-, or a combination thereof, and n is 0, 1 or 2 ), But is not limited thereto.

The reactive mesogen liquid crystal may include, for example, a compound represented by the following formula (A).

(A)

(P ¹ - S ¹ - X ¹ ) _n ¹ - MG - (X ² - S ² - P ² ) _n ²

In the above formula (A)

MG is a bar-shaped mesogenic group,

X ¹ and X ² are each independently a single bond, -O-, -S-, -C (═O) -, -C (═O) O-, O) O-, (a) to (k), or a combination thereof,

S ¹ and S ² are each independently a single bond or a substituted or unsubstituted C1 to C30 spacer group,

P ¹ and P ² are each independently a polymerizable functional group,

n ¹ and n ² each independently may be 0 or 1, but n ¹ and n ² are not simultaneously 0.

For example, MG of formula (A) may be substituted with at least one substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted heterocycloalkyl group, Lt; / RTI >

For example, the MG of formula (A) may be represented by the following formula (B), but is not limited thereto.

[Chemical Formula B]

- (A ¹ - Z ¹ ) _m - A ² --Z ² - A ³ -

In the above formula (B)

A ¹ , A ² and A ³ each independently represents a substituted or unsubstituted 1,4-phenylene group, a substituted or unsubstituted 1,4-cyclohexylene group, a substituted or unsubstituted 1,4-cyclohexenyl A substituted or unsubstituted naphthalene-2,6-diyl group,

Z ¹ and Z ² are each independently a single bond, -O-, -S-, -C (═O) -, -C (═O) O-, = O) O-, - (CH 2) p1 -, -O (CH 2) p2 -, - (CH 2) p3 O-, -CH = CH-, -C = C-, -CH = CH-COO -, -OCO-CH = CH-, or combinations thereof, wherein p1, p2 and p3 each independently may be 1 to 12,

m may be 0, 1 or 2;

For example, S ¹ and S ² in Formula A may each independently be a single bond or a substituted or unsubstituted C1 to C20 alkylene group, but the present invention is not limited thereto.

In one embodiment, each of P ¹ and P ² of the formula (A) independently represents a _{CH 2 = CH-C (=} O) O-, CH 2 = CCH 3 -C (= O) O-, CH 2 = CCl-C ( _{= O) O-, CH 2 =} CH-O-, C (CH 3) H = CH-O-, CHCl = CH-O-, CH 2 = CH-Ph-, CH 2 = CH-PhO (Ph is A substituted or unsubstituted phenylene group), or a combination thereof, but is not limited thereto.

The liquid crystal 12a may be a single kind of liquid crystal or a mixed liquid crystal of two or more kinds.

The silane or germanium compound (12b) may be a monomer containing at least one fluorine at the end, for example, a silane coupling agent or a germanium coupling agent.

The silane or germanium compound (12b) may be, for example, a compound represented by the following formula (1).

[Chemical Formula 1]

In Formula 1,

R ¹ to R ³ , R ⁵ and R ⁶ are each independently hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C1 to C20 alkoxy A substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkoxyalkyl group, a substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkanoyloxy group, a substituted or unsubstituted C1 to C20 alkanoylalkyl group, A substituted or unsubstituted C1 to C20 alkanoyloxyalkyl group, a hydroxy group or a combination thereof,

L is a single bond, a substituted or unsubstituted C1 to C12 alkylene group, a substituted or unsubstituted C1 to C12 heteroalkylene group, a substituted or unsubstituted C7 to C30 alkylarylene group, a substituted or unsubstituted C7 to C30 aryl Lt; / RTI >

R ⁴ is fluorine, a C1 to C3 fluoroalkyl group or a C1 to C3 fluoroalkoxy group,

n is an integer of 0 to 4;

In Formula 1, n may be an integer of 0 to 4. For example, in Formula 1, n may be 0, 1, 2, 3 or 4. When n = 0, the silane or germanium compound represented by the formula (1) may be represented by the following formula (2).

(2)

Wherein Y, L, R ¹ , R ² , R ³ and R ⁴ are as defined in formula (1).

When Y is silicon, the compound represented by Formula 2 may be represented by Formula 3 below.

(3)

In Formula 3, L, R ¹ , R ² , R ³ and R ⁴ are as defined in Formula (1).

For example, each of R ¹ to R ³ , R ^5, and R ⁶ may be independently a substituted or unsubstituted C1 to C20 alkyl group or a substituted or unsubstituted C1 to C20 alkoxy group. For example, each of R ¹ to R ³ may independently be a methyl group, an ethyl group, a propyl group, a methoxy group, an ethoxy group, or a propoxy group. For example, the alkyl group or the alkoxy group may not be substituted with fluorine.

In one example, L may be a substituted or unsubstituted C1 to C12 alkylene group. For example, L may be a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group or a hexylene group. For example, the alkylene group may not be substituted with fluorine.

For example, R ⁴ may be a monofluoromethyl group, a difluoromethyl group or a trifluoromethyl group.

The silane compound containing at least one fluorine at the end may be a fluorinated cyclotrisiloxane compound. The fluorinated cyclotrisiloxane compound can be obtained, for example, from a compound having one fluorinated group represented by the following formula (4), a compound having two fluorinated groups represented by the following formula (5), and a compound having three fluorinated groups represented by the following formula Can be selected.

 [Chemical Formula 4]

In Formula 4,

R ⁷ may be the same as defined for R ⁴ in formula (1), R ⁸ to R ¹² may be the same as defined for R ¹ to R ³ in formula (1), and L 'may be the same as defined for L in formula (1).

[Chemical Formula 5]

In Formula 5,

R ⁷ and R ⁸ may be the same as defined for R ⁴ in formula (1), R ⁹ to R ¹² may be the same as defined for R ¹ to R ³ in formula (1), and L ' .

[Chemical Formula 6]

In Formula 6,

R ⁷ to R ⁹ may be the same as defined for R ⁴ in formula (1), R ¹⁰ to R ¹² may be the same as defined for R ¹ to R ³ in formula (1), and L ' .

The silane or germanium compound 12b may comprise a fluorine-containing moiety at the end and may be arranged perpendicular to the substrate by having affinity or half affinity for the substrate 110 by the fluorine-containing moiety.

Referring to Fig. 2, the fluorine-containing portion of the silane or germanium compound (12b) may be represented by? Or?. For example, when the substrate 110 is free, the fluorine-containing portion (1) of the silane or germanium compound 12b has a semi-affinity for the substrate 110 so that the fluorine-containing portion (1) And can be vertically arranged to be positioned on the air side. For example, when the substrate 110 is a hydrophobic polymer substrate, the fluorine-containing portion (●) of the silane or germanium compound 12b has an affinity for the substrate 110 so that the fluorine-containing portion (●) As shown in FIG.

2, the liquid crystal 12a may be arranged in a direction substantially perpendicular to the longitudinal direction of the substrate 110 and the silane or germanium compound 12b may be arranged in a direction substantially parallel to the liquid crystal 12a Lt; / RTI >

As described above, the silane or germanium compound 12b has an affinity between the substrate 110 and the fluorine-containing portion (●) or a semi-affinity between the substrate 110 and the fluorine-containing portion (■) And may be arranged in the vertical direction. Therefore, the orientation of the liquid crystals 12a can be supported and strengthened by positioning the silane or germanium compound 12b side by side with the liquid crystals 12a between the liquid crystals 12a. Therefore, the vertical alignment of the liquid crystal 12a can be secured directly on the substrate 110 without a separate alignment film.

The polymer (12c) may be a reaction product of a polymerizable compound including a photopolymerizable monomer, a photopolymerizable oligomer, a thermosetting monomer and / or a thermosetting oligomer capable of causing a polymerization reaction by light or heat.

The polymerizable compound is not particularly limited as long as it has at least one polymerizable functional group, and examples thereof include an acrylate group, a methacrylate group, an acryloyl group, a methacryloyl group, a vinyl group, a vinyloxy group, an epoxy group, CH ₂ ═CH-COO-, CH ₂ ═CCH ₃ -COO-, CH ₂ ═CCl-COO-, CH ₂ ═CH-O-, C (CH ₃ ) , CHCl = CH-O-, CH ₂ = CH-Ph-, CH ₂ = CH-PhO wherein Ph is a substituted or unsubstituted phenylene group, or a combination thereof. For example, the polymerizable compound may have an acryloyl group or an acrylate group at the terminal, and may have, for example, 4 to 10 acryloyl groups or acrylate groups.

The polymerizable compound may be, for example, a compound represented by the following formula (C), but is not limited thereto.

≪ RTI ID = 0.0 &

_{^{(P 3 - (CH 2)}} s1) T1 -CR (3-T1) (CH 2) q1 -O- (CH 2) q2 -CR (3-T2) - ((CH 2) s2 -P 4) T2

In formula (C) above,

R is hydrogen or a methyl group,

P3 and P4 are each a polymerizable functional group such as CH ₂ ═CH-COO-, CH ₂ ═CCH ₃ -COO-, CH ₂ ═CCl-COO-, CH ₂ ═CH-O-, C (CH ₃ ) H = CH-O-, CHCl = CH-O-, CH ₂ = CH-Ph-, CH ₂ = CH-PhO wherein Ph is a substituted or unsubstituted phenylene group,

S1, S2, q1 and q2 each independently may be 0 or 1,

T1 and T2 can each independently be 2 or 3.

The polymer 12c is present in the form of a matrix between the liquid crystals 12a, between the substrate 110 and the liquid crystals 12a and between the liquid crystals 12a and the silane or germanium compounds 12b, The bonding strength can be enhanced. Thus it is possible to support and enhance the orientation of the liquid crystals 12a on the substrate 110 and thus to be used in conjunction with the silane or germanium compound 12b to provide a vertical orientation of the liquid crystal 12a directly above the substrate 110, Orientation can be ensured.

The liquid crystal 12a of the liquid crystal layer 120 may have a vertical orientation that is perpendicular to the longitudinal direction of the base 110 as described above. Also, in-plane retardation (R ₀ ) of the liquid crystal layer 120 with respect to incident light of a 550 nm wavelength (hereinafter referred to as a 'reference wavelength') may be ₀ nm? R ₀ ? 1 nm. Herein, the in-plane retardation R ₀ can be expressed as R ₀ = (n _x -n _y ) d, where n _x is a direction in which the in-plane refractive index of the liquid crystal layer 120 is the largest (hereinafter referred to as a slow axis) ', in which the refractive index in the referred to), n _y are in-plane refractive index of the liquid crystal layer is the smallest direction (the "the refractive index of the referred to as the" fast axis (fast axis)), d is the thickness of the liquid crystal layer 120. The in-plane retardation (R ₀ ) may be ₀ nm? R ₀ ? 0.5 nm, and may be substantially 0.

On the other hand, the phase difference has a thickness direction retardation (R _th ) in addition to the in-plane retardation (R ₀ ). Thickness retardation (R _th) may be expressed by a phase difference caused in the direction of the thickness of the liquid crystal layer _{(120) R th = {[} (n x + n y) / 2] -n z} d, where n _x N _y is the refractive index in the fast axis of the liquid crystal layer 120, n _z is the refractive index in the direction perpendicular to n _x and n _y , and d is the refractive index of the liquid crystal layer 120 in the liquid crystal layer 120. [ Is the thickness of layer 120. The thickness direction retardation of the liquid crystal layer (120) (R _th) may be 50nm≤R _th ≤300nm.

The liquid crystal layer 120 may have a refractive index satisfying the following relational expression (1).

[Relation 1]

n _z > n _x = n _y

In the above relational expression 1, n _x is the refractive index at the slow axis of the liquid crystal layer 120, n _y is the refractive index at the fast axis of the liquid crystal layer 120, and n _z is the refractive index in the direction perpendicular to n _x and n _y Refractive index.

The optical film 100 may be used alone or in combination with another film having a different refractive index.

Hereinafter, a compensation film according to one embodiment will be described with reference to FIG. 3 with reference to FIGS. 1 and 2. FIG.

3 is a cross-sectional view schematically illustrating a compensation film according to one embodiment.

The compensation film 300 according to one embodiment includes the optical film 100 and the retardation film 200 described above.

The optical film 100 includes the substrate 110 and the liquid crystal layer 120 as described above. The liquid crystal layer 120 can realize a vertical orientation in which the liquid crystal 12a having vertical orientation is vertically aligned with the longitudinal direction of the substrate 110 without the orientation film by including the vertically oriented liquid crystal 12a together with the silane or germanium compound 12b and the polymer 12c and it may be an in-plane retardation (R ₀₎ to implement a substantially zero-plane isotropic. A detailed description of the optical film 100 is as described above.

The retardation film 200 may be a single layer or a plurality of layers and may be a film having a refractive index different from that of the optical film 100. The retardation film 200 may be, for example, a? / 4 retardation film, a? / 2 retardation film, or a combination thereof, but is not limited thereto. The? / 4 retardation film may be, for example, a film having an in-plane retardation of about 120 nm to 160 nm with respect to incident light having a wavelength of 550 nm, and the? / 2 retardation film may be a film having an in-plane retardation of about 240 nm to 320 nm Lt; / RTI > The retardation film 200 may be, but is not limited to, a film such as a positive or negative A plate, a positive or negative B plate, or a combination thereof.

The compensation film 300 may further include an adhesive layer (not shown) between the optical film 100 and the retardation film 200. The adhesive layer is for effectively bonding the optical film 100 and the retardation film 200, and may be made of, for example, a pressure-sensitive adhesive.

The compensation film 300 may have a refractive index different from that of the optical film 100 and the retardation film 200 by combining the refractive indexes of the optical film 100 and the retardation film 200.

The compensation film 300 may be prepared to have a desired retardation by adjusting the refractive index and thickness of the optical film 100 and the retardation film 200. For example, the compensation film 300 having a compensating function can be prepared by reducing or eliminating the retardation in the thickness direction of the retardation film 200 by reducing the viewing angle dependency and the wavelength dependency. This compensation film 300 can effectively implement the circular polarization compensation function and improve the display characteristics of the display device having such a compensation film 300. [

The compensation film 300 may be prepared by preparing the optical film 100 and the retardation film 200 in the form of films and then bonding them together or by coating the optical film 100 on the retardation film 200, (200) may be coated. When the optical film 100 is prepared in the form of a film, the above-mentioned composition may be applied onto the base material 110 as described above and light-irradiated to crosslink the optical film 100. The compensation film 300 may be formed by, for example, roll-to-roll, spin coating, or transfer, but is not limited thereto.

4 is a cross-sectional view schematically showing a compensation film according to another embodiment.

In the compensation film 300 according to the present embodiment, the retardation films 200a and 200b are located on both sides of the optical film 100, unlike the above-described embodiment.

The compensation film 300 may have a refractive index different from that of the optical film 100 and the retardation films 200a and 200b by combining the refractive indexes of the optical film 100 and the retardation films 200a and 200b. The compensation film 300 may be prepared to have a desired retardation by adjusting refractive index and thickness of the optical film 100 and the retardation films 200a and 200b.

The compensation film 300 may further include an adhesive layer (not shown) on at least one of the optical film 100 and the retardation film 200a and between the optical film 100 and the retardation film 200b. The adhesive layer is for effectively adhering the optical film 100 and the retardation films 200a and 200b, and may be made of, for example, a pressure-sensitive adhesive.

The compensation film 300 described above may be used together with a polarizer to form an anti-reflection film having an external light reflection function.

5 is a cross-sectional view schematically showing an antireflection film according to one embodiment.

Referring to FIG. 5, the anti-reflection film 500 according to one embodiment includes a compensation film 300 and a polarizer 400 positioned on one side of the compensation film 300.

The polarizer 400 may be disposed on one side of the optical film 100 or on one side of the retardation film 200.

The polarizer 400 may be disposed on the side where the light is incident and may be a linear polarizer that converts the polarization of the incident light into linearly polarized light. The polarizer 400 may be made of, for example, stretched polyvinyl alcohol (PVA). For example, the polarizer 400 may be formed by stretching a polyvinyl alcohol film, adsorbing iodine or a dichroic dye thereto, . The polarizer 400 may be, for example, a polarizing film prepared by melt-blending a polymer resin and a dichroic dye, or may be formed by mixing a polymer resin and a dichroic dye and then melting the polymer at a temperature higher than the melting point of the polymer resin have.

The antireflection film 500 may further include a protective layer (not shown) on one side of the polarizer 400. The protective layer may further enhance the durability of the antireflection film 500 or reduce the reflection or glare. For example, the protective layer may be a triacetylcellulose (TAC) film, but is not limited thereto.

The antireflection film 500 may further include a compensation layer (not shown) located on one side of the compensation film 300. The correction layer may be, for example, a color shift resistant layer, but is not limited thereto.

The antireflection film 500 may further include a light blocking layer (not shown) extending along the edge. The light shielding layer may be formed in the form of a band along the periphery of the anti-reflection film 500. The light-shielding layer may include an opaque material, for example, a black material. For example, the light-shielding layer can be made of black ink.

The antireflection film 500 may laminate the compensation film 300 and the polarizer 400 in a roll-to-roll manner, but is not limited thereto.

FIG. 6 is a schematic view showing an external light antireflection principle of an antireflection film according to one embodiment.

6, an incident unpolarized light incident from the outside is transmitted through the polarizer 400, and only one polarized quadrature component of two polarized quadrature components, that is, the first polarized quadrature component, is transmitted, The polarized light may be converted into circularly polarized light while passing through the compensation film 300. The circularly polarized light is reflected by the display panel 40 including the substrate, electrodes, and the like, so that the direction of the circularly polarized light is changed. When the circularly polarized light passes through the compensation film 300 again, Only the polarization orthogonal component, i.e., the second polarization orthogonal component, can be transmitted. Since the second polarized quadrature component does not pass through the polarizer 400 and thus does not emit light to the outside, it can have an effect of preventing reflection of external light.

The above-mentioned optical film 100, the aforementioned compensation film 300 or the above-described antireflection film 500 can be applied to various display devices.

A display device according to an embodiment includes a display panel and a film disposed on one side of the display panel. The display panel may be a liquid crystal display panel or an organic light emitting display panel, but is not limited thereto. The film may be the optical film 100 described above, the compensation film 300 described above, or the antireflection film 500 described above.

Hereinafter, an organic light emitting display will be described as an example of a display device.

7 is a cross-sectional view schematically illustrating an organic light emitting diode display according to an embodiment.

Referring to FIG. 7, the organic light emitting display according to an exemplary embodiment includes an organic light emitting display panel 600 and a film 700 disposed on one side of the organic light emitting display panel 600.

The OLED display panel 600 may include a base substrate 610, a lower electrode 620, an organic emission layer 630, an upper electrode 640, and an encapsulation substrate 650.

The base substrate 610 may be made of glass or plastic.

One of the lower electrode 620 and the upper electrode 640 may be an anode and the other may be a cathode. The anode may be made of a conductive material having a high work function as a hole into which holes are injected, and the cathode may be made of a conductive material having a low work function as an electrode to which an electrode is injected. At least one of the lower electrode 620 and the upper electrode 640 may be made of a transparent conductive material capable of emitting light to the outside, and may be, for example, ITO or IZO.

The organic light emitting layer 630 includes an organic material capable of emitting light when a voltage is applied to the lower electrode 620 and the upper electrode 640.

(Not shown) may be further provided between the lower electrode 620 and the organic light emitting layer 630 and between the upper electrode 640 and the organic light emitting layer 630. The sub-layer may include a hole transporting layer, a hole injecting layer, an electron injecting layer, and an electron transporting layer for balancing electrons and holes. But is not limited thereto.

The encapsulation substrate 650 may be made of glass, metal, and / or polymer and encapsulates the lower electrode 620, the organic emission layer 630, and the upper electrode 640 so that moisture and / .

The film 700 may be disposed on the light-exiting side. For example, in the case of a bottom emission structure in which light is emitted toward the base substrate 610, it may be disposed outside the base substrate 610, and in the case of a top emission structure in which light is emitted toward the sealing substrate 650 And may be disposed outside the sealing substrate 650.

The film 700 may be the optical film 100 described above, the compensation film 300 described above, or the antireflection film 500 described above. For example, when the film 700 is the antireflection film 500, the external light introduced through the antireflection film 500 is reflected by the reflective layer made of metal, such as electrodes and wiring of the organic light emitting display panel 600, It is possible to improve the display characteristics of the organic light emitting display device by preventing the light emitting device from coming out of the apparatus.

Hereinafter, a liquid crystal display device will be described as an example of a display device.

8 is a cross-sectional view schematically showing a liquid crystal display device according to one embodiment.

Referring to FIG. 8, a liquid crystal display device according to an exemplary embodiment includes a liquid crystal display panel 800 and a film 700 positioned on one side of the liquid crystal display panel 800.

The liquid crystal display panel 800 may include a twisted nematic (TN) mode, a patterned vertical alignment (PVA) mode, an in-plane switching (IPS) mode, an optically compensated bend .

The liquid crystal display panel 800 includes a first display panel 810, a second display panel 820 and a liquid crystal layer 830 interposed between the first display panel 810 and the second display panel 820.

The first display panel 810 may include a thin film transistor (not shown) formed on a substrate (not shown) and a first electric field generating electrode (not shown) connected thereto, 820 may include a color filter (not shown) and a second electric field generating electrode (not shown) formed on a substrate (not shown), for example. However, the present invention is not limited thereto. The color filter may be included in the first display panel 810, and the first electric field generating electrode and the second electric field generating electrode may be disposed together in the first display panel 810.

The liquid crystal layer 830 may include a plurality of liquid crystal molecules. The liquid crystal molecules may have a positive or negative dielectric constant anisotropy. When the liquid crystal molecules have a positive dielectric anisotropy, the long axis of the liquid crystal molecules is oriented so as to be substantially parallel to the surfaces of the first and second display panels 810 and 820 in the absence of an electric field, And may be oriented so as to be substantially perpendicular to the surfaces of the first display panel 810 and the second display panel 820. On the other hand, when the liquid crystal molecules have a negative dielectric anisotropy, the long axis is oriented almost perpendicular to the surfaces of the first and second display panels 810 and 820 in the absence of an electric field, The major axis can be oriented substantially parallel to the surfaces of the first display panel 810 and the second display panel 820. [

The film 700 may be the optical film 100 described above, the compensation film 300 described above, or the antireflection film 500 described above. The film 700 is disposed on the outer side of the liquid crystal display panel 800 and is formed on the lower and upper portions of the liquid crystal display panel 800. However, It may be formed only on one of the two sides.

Hereinafter, embodiments of the present invention will be described in detail with reference to examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

Preparation of composition

Manufacturing example  One

1.50 g (30.00 wt%) of a liquid crystal represented by the following formula (A1), 0.038 g (0.76 wt%) of a silane compound represented by the following formula (1a), 0.074 g (1.45 wt%) of a photopolymerizable compound represented by the following formula 0.068 g (1.36% by weight) of 2,2'-dimethoxy-2-phenylacetophenone (photoinitiator) and 3.32 g of propylene glycol methyl ether acetate (PGMEA) (66.43% by weight) were mixed and stirred for 1 hour on a 45 ° C hot plate to prepare a composition.

(A1)

[Formula 1a]

(C1)

Manufacturing example  2

1.50 g (30.00 wt%) of the liquid crystal represented by the formula A1, 0.033 g (0.66 wt%) of the silane compound represented by the formula (1a), 0.074 g (1.45 wt%) of the photopolymerizable compound represented by the formula (1.36% by weight) and 3.325 g (66.53% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred on a hot plate at 45 ° C for 1 hour to prepare a composition .

Manufacturing example  3

1.50 g (30.00% by weight) of the liquid crystal represented by the formula A1, 0.043 g (0.86% by weight) of the silane compound represented by the formula 1a, 0.074 g (1.45 wt%) of the photopolymerizable compound represented by the formula C1, (1.36% by weight) and 3.315 g (66.33% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred on a hot plate at 45 ° C for 1 hour to prepare a composition .

Manufacturing example  4

1.54 g (30.00% by weight) of the liquid crystal represented by the formula A1, 0.052 g (1.04% by weight) of the silane compound represented by the formula 1a, 0.074 g (1.45% by weight) of the photopolymerizable compound represented by the formula C1, (1.36% by weight) and 3.306 g (66.15% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred on a hot plate at 45 ° C for 1 hour to prepare a composition .

Manufacturing example  5

1.50 g (30.00 wt%) of the liquid crystal represented by the formula A1, 0.038 g (0.76 wt%) of the silane compound represented by the formula 1a, 0.064 g (1.28 wt%) of the photopolymerizable compound represented by the formula C1, (66.6% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred for 1 hour on a hot plate at 45 ° C to prepare a composition .

Manufacturing example  6

1.50 g (30.00 wt%) of the liquid crystal represented by the formula A1, 0.038 g (0.76 wt%) of the silane compound represented by the formula 1a, 0.084 g (1.67 wt%) of the photopolymerizable compound represented by the formula C1, (1.36% by weight) and 3.31 g (66.21% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred on a hot plate at 45 ° C for 1 hour to prepare a composition .

Manufacturing example  7

1.50 g (30.00 wt%) of the liquid crystal represented by the formula A1, 0.038 g (0.76 wt%) of the silane compound represented by the formula 1a, 0.118 g (2.37 wt%) of the photopolymerizable compound represented by the formula C1, (1.36% by weight) and 3.276 g (65.51% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and heated at 45 占 폚 on a hot plate The mixture is stirred for 1 hour to prepare a composition.

Manufacturing example  8

1.50 g (30.00% by weight) of the liquid crystal represented by the formula A1, 0.038 g (0.76% by weight) of the silane compound represented by the formula 1a, 0.160 g (3.19% by weight) of the photopolymerizable compound represented by the formula C1, (1.36% by weight) and 3.234 g (64.69% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred on a hot plate at 45 ° C for 1 hour to prepare a composition .

Manufacturing example  9

1.50 g (30.00 wt%) of the liquid crystal represented by the formula A1, 0.038 g (0.76 wt%) of the silane compound represented by the formula 1a, 0.222 g (4.43 wt%) of the photopolymerizable compound represented by the formula C1, (1.36% by weight) and 3.172 g (63.45% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred on a hot plate at 45 ° C for 1 hour to prepare a composition .

Manufacturing example  10

1.50 g (30.00 wt%) of the liquid crystal represented by the formula A1, 0.038 g (0.76 wt%) of the silane compound represented by the formula (1a), 0.265 g (5.31 wt%) of the photopolymerizable compound represented by the formula (1.36% by weight) and 3.129 g (62.57% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and heated at 45 占 폚 on a hot plate The mixture is stirred for 1 hour to prepare a composition.

Comparative Manufacturing Example  One

(1.36% by weight) of 2,2'-dimethoxy-2-phenylacetophenone (photoinitiator) and 3.432 g of propylene glycol methyl ether acetate (PGMEA), 1.50 g (30.00% (68.64% by weight) were mixed and stirred on a hot plate of 45 ° C for 1 hour to prepare a composition.

Comparative Manufacturing Example  2

1.50 g (30.00% by weight) of the liquid crystal represented by the formula A1, 0.038 g (0.76% by weight) of the silane compound represented by the formula 1a, 0.068 g (1.36% by weight) and 3.394 g (67.88% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred for 1 hour on a hot plate at 45 ° C to prepare a composition.

Comparative Manufacturing Example  3

(1.36% by weight) of 2,2'-dimethoxy-2-phenylacetophenone (photoinitiator) and 0.045 g 3.358 g (67.19% by weight) of propylene glycol methyl ether acetate (PGMEA) were mixed and stirred for 1 hour on a hot plate at 45 ° C to prepare a composition.

Comparative Manufacturing Example  4

A composition was prepared in the same manner as in Preparation Example 1, except that the silane compound represented by Formula 1b was used instead of the silane compound represented by Formula 1a.

[Chemical Formula 1b]

Production of film

Example  One

The composition obtained in Production Example 1 was spin-coated on a glass substrate having a thickness of 1 mm at 1000 rpm for 30 seconds. Subsequently, the substrate is dried in an oven at 80 DEG C for 2 minutes and at room temperature for 2 minutes, and then cooled to form a liquid crystal layer. Subsequently, the liquid crystal layer is irradiated with ultraviolet light at a light quantity of 1000 mJ / cm 2 to produce a film having a cured liquid crystal layer formed on the substrate.

Example  2

A film was formed in the same manner as in Example 1, except that the composition obtained in Preparation Example 2 was used in place of the composition obtained in Preparation Example 1.

Example  3

A film was formed in the same manner as in Example 1 except that the composition obtained in Preparation Example 3 was used in place of the composition obtained in Preparation Example 1. [

Example  4

A film was formed in the same manner as in Example 1, except that the composition obtained in Preparation Example 4 was used in place of the composition obtained in Preparation Example 1.

Example  5

A film was formed in the same manner as in Example 1, except that the composition obtained in Preparation Example 5 was used in place of the composition obtained in Preparation Example 1.

Example  6

A film was formed in the same manner as in Example 1, except that the composition obtained in Preparation Example 6 was used in place of the composition obtained in Preparation Example 1.

Example  7

A film was formed in the same manner as in Example 1, except that the composition obtained in Preparation Example 7 was used in place of the composition obtained in Preparation Example 1.

Example  8

A film was formed in the same manner as in Example 1 except that the composition obtained in Preparation Example 8 was used in place of the composition obtained in Preparation Example 1. [

Example  9

A film was formed in the same manner as in Example 1, except that the composition obtained in Production Example 9 was used in place of the composition obtained in Production Example 1.

Example  10

A film was formed in the same manner as in Example 1, except that the composition obtained in Preparation Example 10 was used in place of the composition obtained in Preparation Example 1.

Example  11

A film was formed in the same manner as in Example 1 except that a polycarbonate substrate having a thickness of 20 mu m was used instead of the glass substrate.

Comparative Example  One

A film was formed in the same manner as in Example 1 except that the composition obtained in Comparative Preparation Example 1 was used in place of the composition obtained in Preparation Example 1. [

Comparative Example  2

A film was formed in the same manner as in Example 1 except that the composition obtained in Comparative Preparation Example 2 was used in place of the composition obtained in Preparation Example 1. [

Comparative Example  3

A film was formed in the same manner as in Example 1 except that the composition obtained in Comparative Preparation Example 3 was used in place of the composition obtained in Production Example 1. [

Comparative Example  4

A film was formed in the same manner as in Example 1, except that the composition obtained in Comparative Production Example 4 was used in place of the composition obtained in Production Example 1. [

Comparative Example  5

A film was formed in the same manner as in Example 11 except that the composition obtained in Comparative Production Example 4 was used in place of the composition obtained in Production Example 1. [

evaluation

Rating 1

The retardation of the films according to Examples 1 to 11 and Comparative Examples 1 to 5 is measured.

The phase difference is measured using AxoScan (TM) (Axometrics).

The results are described with reference to Table 1 and FIGS. 9 to 24.

9 to 24 are graphs showing the retardation curves of the films according to Examples 1 to 11 and Comparative Examples 1 to 5, respectively.

In-plane retardation (R ₀ , @ 550 nm) The retardation in the thickness direction (R _th , @ 550 nm) Example 1 0.0 nm -183.3 nm Example 2 0.427 nm -186.35 nm Example 3 0.26 nm -188.46 nm Example 4 0.079 nm -184.57 nm Example 5 0.119 nm -187.12 nm Example 6 0.11 nm -188.71 nm Example 7 0.024 nm -170.17 nm Example 8 0.117 nm -189.80 nm Example 9 0.041 nm -165.63 nm Example 10 0.074 nm -154.36 nm Example 11 0.3 nm 135.8 nm Comparative Example 1 23.3 nm -12.5 nm Comparative Example 2 2.1 nm 131.6 nm Comparative Example 3 1.7 nm 114.8 nm Comparative Example 4 1.6 nm 183.3 nm Comparative Example 5 3.1 nm 135.8 nm

9 to 24, the red line is a tilt about a fast axis and the blue line is a tilt about a slow axis. In the graph, the curves of the leading and trailing axes are U- The higher the degree to which the curves of the fast axis and the slow axis coincide with each other, the better the vertical alignment of the liquid crystal layer is, and as a result, the in-plane retardation R ₀ ) Indicates a value close to zero.

Referring to Table 1 and FIGS. 9 to 24, it can be seen that the liquid crystal layer according to Examples 1 to 11 exhibits a good phase contrast graph with respect to the incident angle and shows a very low in-plane retardation (R ₀ ) of about 1.0 nm or less have. Since the in-plane retardation (R ₀ ) of the film influences the in-plane retardation of the substrate itself in addition to the in-plane retardation of the liquid crystal layer, the in-plane retardation of the liquid crystal layer is determined to be substantially 0 .

Rating 2

The alignment states of the liquid crystal layers formed in Examples 1 and 11 and Comparative Examples 1 to 5 are confirmed by using a polarized optical microscope.

A polarizer and an analyzer of a polarizing microscope (Eclipse LV100POL, NIKON) were set at right angles to each other (90 degrees), and the films according to Examples 1 and 11 and Comparative Examples 1 to 5 were placed on a sample stand to form black black) is complete. When full black is realized, the vertical alignment of the liquid crystal layer is good, and the lower the degree of black is, the more the vertical alignment is poor and the light leaks.

The results are shown in Figs. 25 to 31.

25 is a photograph of the film according to Example 1 observed using a polarization microscope, Fig. 26 is a photograph of the film according to Example 11 observed using a polarization microscope, Fig. 27 is a photograph showing a film according to Comparative Example 1 FIG. 28 is a photograph of a film according to Comparative Example 2 observed using a polarizing microscope, FIG. 29 is a photograph of a film according to Comparative Example 3 observed using a polarizing microscope, and FIG. 30 is a photograph of a film according to Comparative Example 4 observed using a polarization microscope, and FIG. 31 is a photograph of a film according to Comparative Example 5 observed using a polarizing microscope.

Referring to Figures 25 and 26, it can be seen that the films according to Examples 1 and 11 exhibit complete black. This may mean that the films according to Examples 1 and 11 are substantially complete in the vertical orientation of the liquid crystal in the liquid crystal layer.

On the other hand, referring to FIG. 27 to FIG. 31, it can be confirmed that the films according to Comparative Examples 1 to 5 do not exhibit complete black and light leaks. This means that the films according to Comparative Examples 1 to 5 are incomplete in the vertical orientation of the liquid crystal in the liquid crystal layer, thereby allowing a part of light to pass therethrough.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

12a: liquid crystal 12b: silane or germanium compound
12c: Polymer
100: Optical film 110: Base material
120: liquid crystal layer 200: retardation film
300: compensation film 400: polarizer
500: antireflection film 600: organic light emitting display panel
610: Base substrate 620: Lower electrode
630: light emitting layer 640: upper electrode
650: sealing substrate 700: film
800: liquid crystal display panel 810: first display panel
820: second display panel 830: liquid crystal layer

Claims (19)

Homeotropic liquid crystal,
A silane or germanium compound containing at least one fluorine at the end thereof, and
Polymerizable compound
And an optical film.
The method of claim 1,
Wherein the silane or germanium compound is represented by the following Formula 1:
[Chemical Formula 1]

In Formula 1,
Y is Si or Ge,
R ¹ to R ³ , R ⁵ and R ⁶ are each independently hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C1 to C20 alkoxy A substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkoxyalkyl group, a substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkanoyloxy group, a substituted or unsubstituted C1 to C20 alkanoylalkyl group, A substituted or unsubstituted C1 to C20 alkanoyloxyalkyl group, a hydroxy group or a combination thereof,
L represents a single bond, a substituted or unsubstituted C1 to C12 alkylene group, a substituted or unsubstituted C1 to C12 heteroalkylene group, a substituted or unsubstituted C7 to C30 alkylarylene group, a substituted or unsubstituted C7 to C30 arylalkyl Rengi,
R ⁴ is fluorine, a C1 to C3 fluoroalkyl group or a C1 to C3 fluoroalkoxy group,
n is an integer of 0 to 4;
The method of claim 1,
Wherein the polymerizable compound comprises a compound having 4 to 10 acryloyl groups or acrylate groups.
The method of claim 1,
Wherein the composition for an optical film further comprises a solvent,
An optical film comprising 5 to 50% by weight of the vertically oriented liquid crystal, 0.1 to 1.1% by weight of the silane or germanium compound, 1 to 10% by weight of a polymerizable compound, and a residual solvent, based on the total amount of the composition Composition.
5. The method of claim 4,
A composition for an optical film further comprising a photoinitiator.
The method of claim 5,
Wherein the photoinitiator is contained in an amount of 0.1 to 2% by weight based on the total amount of the composition.
Description, and
The liquid crystal layer located on one side of the substrate
/ RTI >
Wherein the liquid crystal layer comprises a vertically oriented liquid crystal, a silane or germanium compound containing at least one fluorine at the terminal, and a polymer.
8. The method of claim 7,
Wherein the silane or germanium compound is represented by the following Formula 1:
[Chemical Formula 1]

In Formula 1,
Y is Si or Ge,
R ¹ to R ³ , R ⁵ and R ⁶ are each independently hydrogen, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C1 to C20 alkoxy A substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkoxyalkyl group, a substituted or unsubstituted C1 to C20 alkanoyl group, a substituted or unsubstituted C1 to C20 alkanoyloxy group, a substituted or unsubstituted C1 to C20 alkanoylalkyl group, A substituted or unsubstituted C1 to C20 alkanoyloxyalkyl group, a hydroxy group or a combination thereof,
L represents a single bond, a substituted or unsubstituted C1 to C12 alkylene group, a substituted or unsubstituted C1 to C12 heteroalkylene group, a substituted or unsubstituted C7 to C30 alkylarylene group, a substituted or unsubstituted C7 to C30 arylalkyl Rengi,
R ⁴ is fluorine, a C1 to C3 fluoroalkyl group or a C1 to C3 fluoroalkoxy group,
n is an integer of 0 to 4;
8. The method of claim 7,
Wherein the vertically aligning liquid crystal is arranged in a direction substantially perpendicular to the longitudinal direction of the substrate,
Wherein the silane or germanium compound is arranged in a direction parallel to the longitudinal direction of the vertically aligning liquid crystal.
8. The method of claim 7,
Wherein the polymer is positioned between the vertically oriented liquid crystals.
8. The method of claim 7,
Plane retardation (R ₀ ) of the liquid crystal layer with respect to incident light having a wavelength of 550 nm is ₀ nm? R ₀ ? 1 nm.
12. The method of claim 11,
The absolute value of retardation (R _th) in the thickness direction of the liquid crystal layer to the incident light of a wavelength of 550nm is 50nm≤R _th ≤300nm optical film.
8. The method of claim 7,
Wherein the liquid crystal layer has a refractive index satisfying the following relational expression 1:
[Relation 1]
n _z > n _x = n _y
In the above formula 1,
n _x is a refractive index in the slow axis (slow axis) of the liquid crystal layer, n _y is a refractive index in the fast axis (fast axis) of the liquid crystal layer, n _z is a refractive index in the direction perpendicular to n _x and n _y to be.
8. The method of claim 7,
Wherein an alignment film is not interposed between the substrate and the liquid crystal layer.
An optical film according to any one of claims 7 to 14, and
A retardation film disposed on at least one surface of the optical film,
≪ / RTI >

16. The method of claim 15,
Wherein the retardation film comprises a? / 4 retardation film, a? / 2 retardation film, or a combination thereof.
A compensation film according to claim 15,
A polarizer disposed on one surface of the compensation film,
.
Display panel, and
An optical film according to claim 7, a compensation film according to claim 15, or an antireflection film according to claim 17
.
The method of claim 18,
Wherein the display panel is a liquid crystal display panel or an organic light emitting display panel.

Images