KR20160000102A - Optical sheet, composition for forming optical pattern for the same, composite optical sheet comprising the same and optical display apparatus comprising the same - Google Patents

Abstract

The present invention relates to an optical sheet comprising a base film, and an optical pattern layer formed on the base film. A refractive index of the optical pattern layer is at least 1.62. The P peak height to the C peak height ratio of the optical pattern layer is at least 0.1 according to energy dispersive X-ray spectroscopy (EDS). Each of the absolute values of Δx and Δy of the optical sheet are at most 0.003 measured by a luminance meter. Provided are the optical sheet to increase luminance due to a high refractive index when the optical sheet is used on a liquid crystal display, a composite optical sheet including the same, and an optical display device including the same.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical sheet, a composition for forming an optical pattern thereon, a composite optical sheet including the optical sheet, and an optical display device including the same. BACKGROUND ART }

The present invention relates to an optical sheet, a composition for forming an optical pattern therefor, a composite optical sheet including the optical sheet, and an optical display device including the same.

The liquid crystal display device includes an optical sheet including a base film and an optical pattern layer formed on the base film. A light guide plate is disposed under the optical sheet, and light incident from the light guide plate is refracted and emitted. In order to increase the brightness of the liquid crystal display device, the refractive index of the optical sheet must be increased. However, there has been a limit in increasing the refractive index of the optical sheet when the high refractive index monomer is used. Further, even when the refractive index of the optical sheet is increased, yellowing occurs in the optical sheet, and transparency and adhesion are not good.

Further, a protective sheet or another optical sheet may be further formed on the optical sheet. The optical pattern can be influenced by the contact of the optical pattern layer of the optical sheet with the protective sheet or the like and the brightness of the liquid crystal display device can be lowered so that it is necessary to improve the scratch resistance in addition to the refractive index. In addition, monomers having a high refractive index have been developed, but problems have arisen such as a solid phase type monomer having poor processability or a yellowing phenomenon when it is produced from an optical sheet.

The background art of the present invention is disclosed in Korean Patent Publication No. 2013-0074115.

An object of the present invention is to provide an optical sheet which has a high refractive index and can increase brightness when used in a liquid crystal display.

Another object of the present invention is to provide an optical sheet excellent in transparency, impact resistance and the like, free from yellowing, and excellent in adhesion between an optical pattern layer and a base film.

The optical sheet of the present invention comprises a base film and an optical pattern layer formed on one surface of the base film, wherein the optical pattern layer has a refractive index of 1.62 or more, and the optical pattern layer has P (energy dispersive X-ray spectroscopy) The ratio of the height of the peak / the height of the C peak is 0.1 or more, and the absolute value of? X and? Y measured by the luminance meter of the optical sheet may be 0.003 or less, respectively.

The composition for forming an optical pattern of the present invention may comprise a monomer of the following formula (1), a non-phosphorus monomer and an initiator:

≪ Formula 1 >

(Wherein R ₁ , R ₂ , X ₁ , X ₂ , Y ₁ , Y ₂ , Ar ₁ , n ₁ and n ₂ are as defined in the following description).

The composite optical sheet of the present invention includes a first optical sheet and a second optical sheet formed on the first optical sheet, and the first optical sheet may include the optical sheet of the present invention.

The optical display device of the present invention may include the optical sheet.

The present invention provides an optical sheet having a high refractive index and capable of increasing brightness when used in a liquid crystal display device. The present invention provides an optical sheet excellent in scratch resistance, transparency and impact resistance, free of yellowing, and excellent in adhesion between an optical pattern layer and a base film.

1 is a perspective view of an optical sheet according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view taken along line XY in Fig. 1. Fig.
3 is a perspective view of an optical sheet of another embodiment of the present invention.
4 is a perspective view of a composite optical sheet according to an embodiment of the present invention.
5 is a perspective view of an optical display device according to an embodiment of the present invention.
6 shows the EDS results (x-axis unit is keV and y-axis unit is Intensity) of the third embodiment.
7 shows the EDS results (x-axis unit is keV and y-axis unit is Intensity) of Comparative Example 1. Fig.

Embodiments of the present application will now be described in more detail with reference to the accompanying drawings. However, the techniques disclosed in this application are not limited to the embodiments described herein but may be embodied in other forms. It should be understood, however, that the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the width, thickness, and the like of the components are enlarged in order to clearly illustrate the components of each device. Like numbers refer to like elements throughout the several views.

The terms "upper" and "lower" in this specification are defined with reference to the drawings, wherein "upper" may be changed to "lower", "lower" What is referred to as "on" may include not only superposition, but also intervening other structures in the middle. On the other hand, what is referred to as "directly on" or "directly above "

As used herein, "(meth) acrylic" means acrylic and / or methacrylic.

Hereinafter, an optical sheet of one embodiment of the present invention will be described with reference to Fig. FIG. 1 is a perspective view of an optical sheet according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line X-Y in FIG.

1, an optical sheet 100 according to an embodiment of the present invention includes a base film 110 and an optical pattern layer 120 formed on the base film 110. The optical pattern layer 120 has a refractive index 1.62 or more and the ratio of the height of the P peak to the height of the C peak when the optical pattern layer 120 is subjected to energy dispersive X-ray spectroscopy (EDS) is 0.1 or more, and the optical sheet 100 has? X , And? Y may be 0.003 or less, respectively.

The optical sheet is disposed on a light guide plate or other optical sheet in a liquid crystal display device, and refracts and emits light incident from a light guide plate or another optical sheet. Since the refractive index of the optical pattern layer 120 of the embodiment of the present invention is 1.62 or more and the ratio of the height of the P peak to the height of the C peak when the optical pattern layer 120 is EDS is 0.1 or more, Can be emitted at a high luminance, is free from yellowing, has good transparency and impact resistance, and has good adhesion between a base film and an optical pattern. For example, the refractive index of the optical pattern layer 120 may be 1.62 to 1.70, and the ratio of the height of the P peak / the height of the C peak when the optical pattern layer 120 is subjected to EDS may be 0.1 to 5 have. Further, the optical sheet 100 has an absolute value of Δx and Δy measured by a luminance meter of 0.003 or less, for example, 0.0001 to 0.003, thereby suppressing yellowing and increasing brightness.

The optical sheet 100 may have a luminance gain value of 2.0% or more, for example, 2.0 to 5%, and the luminance improving effect may be obtained in the above range. The brightness gain value of the optical sheet means a rate at which the brightness is increased when the optical sheet is further included in the backlight unit for the liquid crystal display. The brightness gain value is obtained by sequentially stacking the diffusion plates on the light guide plate, The backlight unit for liquid crystal display used in the measurement of luminance A further laminated an optical sheet on the diffuser plate so that the base material film of the optical sheet is directed toward the diffuser plate ) ≪ / RTI > luminance B and can be calculated from the following equation 2:

<Formula 2>

The luminance gain value of the optical sheet = (B-A) / A x 100

      The optical sheet has a light emitting surface as a top surface and a light incident surface as a bottom surface to emit light incident from the bottom surface to the top surface. The optical sheet has a base film 110 and an optical pattern layer 120).

The base film 110 includes a light incident surface and supports the optical pattern layer 120. The thickness of the base film 110 is not limited, but may be 10 to 300 μm, for example, 50 to 125 μm. Can be used.

The base film 110 can have a refractive index of 1.5 to 1.7, and can be used in the optical sheet in the above range, securing a refractive index of 1.59 or more of the optical sheet, and emitting light with high brightness.

The base film 110 may be formed of the same or different material as the optical pattern layer 120, and may be a transparent film formed of, for example, a thermoplastic resin or a composition containing the thermoplastic resin. Specifically, the thermoplastic resin may be a polyester resin including a polyethylene terephthalate resin and a polyethylene naphthalate resin, a polyacetal resin, a (meth) acrylic resin, a polycarbonate resin, a styrene resin, a vinyl resin, a polyphenylene ether Butadiene-styrene copolymer resin, poly (meth) acrylate resin, polyaryl sulfone resin, polyether sulfone resin, polyether sulfone resin, polyether sulfone resin, polyether sulfone resin, , A polyphenylene sulfide-based resin, and a fluorine-based resin.

The optical pattern layer 120 includes a light exit surface and refracts and emits light incident from the base film 110. The optical pattern layer 120 has at least one optical pattern formed on the base film, 1 shows a case where a triangle is a prism in a cross section, but the optical pattern is not limited thereto. The optical pattern may be a prism, a microlens pattern, a lenticular lens pattern, an emboss pattern, or an emboss pattern having a polygonal cross section (polygon having 4 to 10 sides) Combinations may be included.

Referring to FIG. 2, the height of the optical pattern layer 120, that is, the optical pattern may be the same or different for each pattern. Specifically, the height H of the optical pattern may be 10 to 40 μm, for example, 10 to 30 μm , The light converging effect may be present in the above range. The pitch P of the optical patterns may be the same or different for each pattern. Specifically, the pitch may be 10 to 60 占 퐉, for example, 20 to 60 占 퐉, and the light converging effect may be in the above range. The apex angle alpha of the optical pattern may be 80 to 100 DEG, and the brightness enhancement effect may be obtained in the above range.

The optical pattern layer 120 may be formed of a composition for forming an optical pattern containing a sulfur (S) and phosphorus (P) and a curable monomer having a refractive index of 1.65 or more. In an embodiment, P) and a refractive index of 1.65 or more can be represented by the following formula (1): &lt; EMI ID =

&Lt; Formula 1 >

(여기서, R₃는 수소 원자 또는 메틸기이고, X₃는 -O-또는 -N(R)-(R: 수소 원자 또는 탄소수 1 내지 10의 알킬기)이며, *는 결합 부위를 나타냄)이고, Y₁ 및 Y₂ 중 하나 이상은

이며, n₁ 및 n₂의 평균값은 각각 독립적으로 1 내지 4이다).R ₁ and R ₂ are each independently an alkylene group having 2 to 10 carbon atoms, an arylene group having 6 to 20 carbon atoms, an alkylarylene group or an arylalkylene group having 7 to 20 carbon atoms, Ar ₁ is a group having 6 to 10 carbon atoms X ₁ and X ₂ are each independently -O- or -S-, Y ₁ and Y ₂ are each independently a hydrogen atom, -OH, -SH, -NH ₂ or

(Wherein R ₃ is a hydrogen atom or a methyl group, X ₃ is -O- or -N (R) - (R is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms), * ₁ and Y &lt; ₂ &gt;

And the average values of n ₁ and n ₂ are independently 1 to 4).

The monomer of formula (1) can be cured as a monofunctional or bifunctional curable monomer to form a matrix of optical patterns, and the refractive index of the optical sheet can be increased to increase the brightness. Further, when the optical pattern layer according to EDS is used, the refractive index of the optical pattern layer is made higher by setting the ratio of the height of the P peak / the height of the C peak to 0.1 or more, for example, 0.1 to 5, It is possible to further improve the light converging effect. Further, the adhesion of the base film and the optical pattern layer can be further increased due to hydrogen bonding with the base film. In the case of the monomer represented by the general formula (1), when the ratio of the height of the S peak / the height of the C peak is 1.0 or more, for example, 1 to 10, for example, 1.0 to 8.0 in the optical pattern layer, The luminance can be further improved, and the light-converging effect can be obtained. When the ratio of the height of the S peak / the height of the C peak is in the above range, the yellow cured prism sheet does not cause yellowing.

 The monomers of formula (1) may be included in the composition alone or in combination of two or more.

The monomer of the formula (1) may have a refractive index of 1.65 or more, for example, 1.65 to 1.8, for example, 1.65 to 1.75, and the refractive index of the optical sheet may be increased in the above range to improve the brightness.

Specific examples of the monomer of the formula (1) may be represented by any one of the following formulas (1a) to (1f), but are not limited thereto:

<Formula 1a>

&Lt; EMI ID =

&Lt; Formula 1c >

<Formula 1d>

<Formula 1e>

&Lt; Formula 1f >

(In the above formulas 1a to _{1f, R 3, Ar 1,} X 1, X 2, X 3, n 1 and n ₂ are as defined in Formula _1, m 1, m ₂ is 2 to 10, each independently Integer).

Preferably, the monomer of formula (1) may be represented by the monomer of formula (Ia), and as a result, the compatibility with other monomers contained in the composition for optical sheets may be enhanced to further enhance the transparency of the optical sheet.

Preferably, n ₁ + n ₂ may be 2 to 5, and the refractive index may be high in the above range to improve the brightness.

Monomers of formula (1) may be prepared by conventional synthetic methods, for example, by reacting a compound of formula (2) and a compound of formula (3):

(2)

(Wherein R ₁ , R ₂ , Ar ₁ , X ₁ , X ₂ , n ₁ and n ₂ are as defined in Formula 1, Z ₁ and Z ₂ are each independently a hydrogen atom, Or -NH ₂ , and at least one of Z ₁ and Z ₂ is -OH or -NH ₂ .

(3)

(In the above formula (3), R ₃ is a hydrogen atom or a methyl group, and X is a halogen atom)

As used herein, a "halogen atom" is fluorine, chlorine, iodine, or bromine.

The compound of formula (1) is synthesized by condensation reaction of the compound of formula (2) and the compound of formula (3) to form an ester or amide bond. Specifically, the condensation reaction is carried out in a solvent in the presence of a basic catalyst at -10 to 10 ° C, To 5 &lt; 0 &gt; C for 30 minutes to 20 hours, for example 1 hour to 10 hours. Compounds of formula (1) can be prepared in high yields in the above range.

의 개수에 따라 달라질 수 있으나, 예를 들면 1 : 1 내지 1 : 2.2일 수 있다. The molar ratio in the condensation reaction of the compound of the formula (2): the compound of the formula (3)

For example, from 1: 1 to 1: 2.2.

The basic catalyst may comprise at least one of triethylamine, diisopropylamine, tetramethylethylenediamine, pyridine, sodium hydroxide, potassium hydroxide, potassium carbonate, dibutyltin dilaurate and amine complexes. The amount of the basic catalyst to be used may be 100 to 220 moles, for example, 100 to 150 moles per 100 moles of the total moles of the compound of the formula (2) and the compound of the formula (3), and the compound of the formula .

The solvent may be at least one of tetrahydrofuran, chloroform, dichloromethane, N-methylpyrrolidone, methylsulfoxide, N, N-dimethylacetamide, dioxane, alcohol, benzene, dimethoxyethane, acetonitrile, . The amount of the solvent to be used may be 300 to 800 parts by weight, for example, 400 to 500 parts by weight, based on 100 parts by weight of the sum of the compound of the formula (2) and the compound of the formula (3). Within this range, a higher yield relative to the solvent used can be obtained.

The compound of formula (2) may be prepared by reacting a compound of formula (4) with a compound of formula (5a) and a compound of formula (5b)

[Chemical Formula 4]

In Formula 4, Ar ₁ is as defined in Formula 1, and X is a halogen atom;

[Chemical Formula 5a]

[Chemical Formula 5b]

(Wherein R ₁ , R ₂ , X ₁ , X ₂ , n ₁ and n ₂ are as defined in Formula 1, and Z ₁ and Z ₂ are each a hydrogen atom, -OH, or -NH ₂ And at least one of Z ₁ and Z ₂ is -OH or -NH ₂ .

The reaction of the compound of the formula (4) with the compound of the formula (5a) and the compound of the formula (5b) is carried out in a solvent in the presence of a basic catalyst at a temperature of -10 to 50 ° C, for example at a temperature of -5 to 30 ° C for 30 minutes to 20 hours, 10 hours. &Lt; / RTI &gt; The basic catalyst and the solvent may be the basic catalyst and the solvent used in the condensation reaction of the compound of the formula (2) and the compound of the formula (3), respectively. The amount of the basic catalyst to be used may be 100 to 200 moles, for example, 100 to 150 moles per 100 moles of the total moles of the compound of the general formula (4) and the compound of the general formulas 5a and / or 5b. Compounds of formula (2) can be prepared in high yields in the above range. The amount of the solvent to be used may be 300 to 800 parts by weight, for example, 400 to 500 parts by weight based on 100 parts by weight of the total of the compound of the formula (4) and the compound of the formula (5a) and / or the compound of the formula (5b). Within this range, a higher yield relative to the solvent used can be obtained.

The compound of formula (4): the molar ratio of the compound of formula (5a) and / or (5b) may be 1: 2 to 1: 2.2, but is not limited thereto.

The optical pattern layer may be formed of a composition for forming an optical pattern including a monomer of the formula (1). The composition for forming an optical pattern of one embodiment of the present invention will be described below.

The composition for forming an optical pattern according to an embodiment of the present invention may include a monomer of Formula 1, a non-phosphorus monomer not containing phosphorus, and an initiator. As a result, the refractive index of the optical sheet may be increased to increase the brightness, Or brightness enhancement effect.

The monomer of the formula (1) may be contained in an amount of 20 to 80% by weight, specifically 25 to 60% by weight, based on the solid content in the composition for forming an optical pattern. The refractive index of the optical sheet may be increased within the above range to increase the brightness, Can be.

The non-phosphorous monomer is cured to form a matrix of the optical pattern layer, and as a diluting monomer, the viscosity of the composition for forming an optical pattern is lowered to facilitate the formation of an optical pattern. As the non-phosphorous monomer, As the monomer, a monofunctional (meth) acrylic monomer or a bifunctional (meth) acrylic monomer may be contained.

The non-phosphorus monomer has a small difference in refractive index from the monomer of the general formula (1), so that the transparency and the refractive index of the optical sheet can be increased when the monomer is mixed with the monomer of the general formula (1). Specifically, the non-phosphorus monomer may have a refractive index of from 1.55 to 1.64, for example, from 1.58 to 1.62, and the transparency and the refractive index of the optical sheet can be increased within the above range.

Non-phosphorus monomers may contain sulfur (S) to enhance compatibility with monomers of formula (1), for example, may comprise moieties of the following formula (6a) or (6b)

&Lt; Formula 6a &

Wherein R ₁₁ is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an arylalkyl group having 7 to 10 carbon atoms, R ₁₂ is an alkyl group having 1 to 10 carbon atoms, An arylene group having 6 to 10 carbon atoms, or an arylalkylene group having 7 to 10 carbon atoms.

<Formula 6b>

(In the formula 6b * is a binding site of an element, R _13, R ₁₄ are each independently C 1 -C 10 alkylene group, arylene group, an arylalkyl group having 7 to 10 of carbon number 6 to 10).

Preferably, the non-phosphorus monomer comprises at least one of an arylene group having 6 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, an arylalkylene group having 7 to 10 carbon atoms, and an arylalkyl group having 7 to 10 carbon atoms, By lowering the refractive index difference with the monomer of formula (1), the compatibility of the composition for forming an optical pattern and the transparency of the optical pattern layer can be enhanced.

For example, non-phosphorus monomers include [4- (phenylthio) phenyl] alkyl esters, including [4- (phenylthio) phenyl] methyl (meth) Propylene thiobis (1, 4-phenylene alkylene) esters, and the like, including, but not limited to, those synthesized, commercially available products Can be used.

The non-phosphorus monomer may include monofunctional (meth) acrylic monomers and bifunctional (meth) acrylic monomers alone, but by including a mixture thereof, the refractive index of the optical sheet can be increased and the degree of crosslinking can be improved. Monofunctional (meth) acrylic monomers: Bifunctional (meth) acrylic monomers may be mixed in a weight ratio of 1: 1 to 4: 1.

The non-phosphorus monomer may be contained in the composition for forming an optical pattern in an amount of 10 to 70% by weight, specifically 20 to 60% by weight based on the solid content. In the above range, the refractive index of the optical sheet can be increased together with the monomer of the formula The composition for pattern formation can have an appropriate viscosity and the coating property can be enhanced.

The initiator is an agent for curing the monomer of formula (1) and the non-phosphorous monomer to form an optical pattern layer. The initiator may include at least one of ordinary photocurable initiator and heat curing initiator. For example, phosphine oxide, formate, phosphate and the like can be used, but not always limited thereto.

The initiator may be contained in an amount of 0.1 to 10% by weight, specifically 1 to 5% by weight, based on the solid content in the composition for forming an optical pattern, and the curing can be completed within the above range, Yellowing can be prevented.

The composition for forming an optical pattern may further contain usual additives. The additives may include, but are not limited to, leveling agents, antistatic agents, surfactants, colorants, and the like. In addition, the composition for forming an optical pattern may be made into a solvent-free type that does not include a solvent, or may further include a solvent to increase the coating property of the composition. For example, methyl ethyl ketone or the like may be used.

The composition for forming an optical pattern may have a viscosity at 25 ° C of 800 to 2000 cps, for example, 1000 to 2000 cps, for example, 800 to 1600 cps, and the optical pattern can be easily formed in the above range.

Hereinafter, the composition for forming an optical pattern of another embodiment of the present invention will be described.

The composition for forming an optical pattern according to another embodiment of the present invention may include a monomer represented by the general formula (1), a non-phosphorous monomer, a crosslinking agent and an initiator. As a result, the refractive index of the optical sheet can be increased to increase the brightness of the optical sheet, There may be more effect.

By further including a crosslinking agent, it is possible to increase the degree of crosslinking during curing of the composition for optical pattern formation and to improve the scratch resistance. The composition for forming an optical pattern of the present invention is substantially the same as the composition for forming an optical pattern of the present invention except that it further contains a crosslinking agent.

The crosslinking agent is a trifunctional or more (meth) acrylic monomer and cured together with the monomers of formula (1) and the non-phosphorus monomer to increase the degree of crosslinking of the optical sheet to improve the scratch resistance of the optical sheet. , For example, trifunctional or hexafunctional (meth) acrylic monomers, which may be used singly or in combination of two or more.

The crosslinking agent has a small difference in refractive index from the monomer of the formula (1), thereby increasing the transparency and refractive index of the optical sheet when mixed with the monomer of the formula (1). Specifically, the refractive index of the crosslinking agent can be 1.45 to 1.55, and the transparency and the refractive index of the optical sheet can be increased within the above range.

The crosslinking agent may contain from 2 to 9 photocurable functional groups (e.g., (meth) acrylate groups), and at least one chain may include a long structure, and these may be used alone or in combination of two or more. Preferably, the cross-linking agent has an aromatic group so that the refractive index can be further increased.

The crosslinking agent may be contained in an amount of 0 to 25% by weight, for example, 0.1 to 25% by weight, specifically 1 to 20% by weight, based on solids in the composition for forming an optical pattern. The impact resistance can be increased and the handling property can be improved.

Hereinafter, the composition for forming an optical pattern of another embodiment of the present invention will be described.

In another embodiment of the present invention, the composition for forming an optical pattern may comprise a monomer of Formula 1, a non-phosphorus monomer, a monomer comprising an alkylene oxide unit of Formula 7, and an initiator:

&Lt; Formula 7 >

(Wherein, * is the connecting site of the element, R ₁₅ is an alkylene group having 1 to 5 carbon atoms, and n is an integer of 1 to 10). Preferably, n may be an integer from 3 to 6.

By further including the monomer containing the unit of the formula (7), the scratch resistance of the optical sheet can be further improved and the handling property can be further improved.

The monomer containing the unit of the formula (7) is a monofunctional or bifunctional curable monomer which is cured with a monomer of the formula (1), a non-phosphorus monomer to form a matrix of the optical sheet, The scratch resistance can be further improved.

The monomers of formula (7) may be included in the composition alone or in combination of two or more.

The monomer having the unit represented by the general formula (7) has a small difference in refractive index from the monomer represented by the general formula (1), thereby increasing the transparency and the refractive index of the optical sheet when mixed with the monomer represented by the general formula (1). Specifically, the monomer having the unit represented by the formula (7) may have a refractive index of 1.50 to 1.56, and the transparency and refractive index of the optical sheet can be increased within the above range. For example, the monomer containing the unit of the formula (7) may contain an aromatic group to ensure the refractive index.

In embodiments, the monomers comprising units of formula (7) are non-phosphorus and non-sulfur monomers that do not contain phosphorus and sulfur, and may be represented by formula (8)

(8)

(Wherein R ₁₆ and R ₁₇ are each independently an arylene group having 6 to 10 carbon atoms, an alkylarylene group having 7 to 20 carbon atoms, or an arylalkylene group having 7 to 20 carbon atoms, R ₁₈ is a single bond, -S-, -O-, -NR (R is hydrogen or an alkyl group having 1 to 5 carbon atoms), R ₁₉ and R ₂₀ are each independently hydrogen or a methyl group, n ₁ and n ₂ Are each independently an integer of 1 to 10).

Preferably, R ₁₆ and R ₁₇ are each independently an arylene group having 6 to 10 carbon atoms, and R ₁₈ is -S-, thereby improving the compatibility with the monomer of formula (1) and increasing the refractive index of the optical sheet have. Preferably, n ₁ + n ₂ can be from 8 to 14, and the adhesion improving effect can be obtained in the above range. Preferably, n ₁ and n ₂ each independently may be 3 to 6.

The monomer containing the unit of the formula (7) may be synthesized by a conventional method or a commercially available product may be used.

The monomer containing the unit represented by the formula (7) may be contained in an amount of 0 to 50% by weight, such as 0 to 45% by weight, for example, 1 to 50% by weight in the composition for forming an optical pattern based on a solid content, .

Hereinafter, the composition for forming an optical pattern of another embodiment of the present invention will be described.

The composition for forming an optical pattern of another embodiment of the present invention may include a monomer of Formula 1, a non-phosphorous monomer, a crosslinking agent, a monomer containing a unit of Formula 7, and an initiator. As a result, it is possible to increase the refractive index of the optical sheet to increase the luminance and to improve the scratch resistance.

The optical sheet can be formed by a conventional optical sheet forming method using the composition for forming an optical pattern of the embodiment of the present invention. For example, it can be produced by coating a composition for forming an optical pattern on a base film to a predetermined range of thickness, pressing the pattern with a stamp roll formed with an optical pattern, and curing the pattern. The curing may include one or more of photocuring and thermosetting, wherein the photocuring comprises irradiation at an irradiance of 10 to 1000 mJ / cm &lt; ² &gt; at the UV wavelength and the thermosetting is conducted at a temperature of 50 to 100 & Curing.

Hereinafter, the present invention will be described with reference to FIG. 3 of another embodiment. 3 is a perspective view of an optical sheet of another embodiment of the present invention.

3, an optical sheet 200 according to another embodiment of the present invention includes a base film 110, an optical pattern layer 120 formed on the base film 110, and a coating layer 130 formed below the base film 110. [ The optical pattern layer 120 has a refractive index of 1.62 or more and the ratio of the height of the P peak to the height of the C peak when the optical pattern layer 120 is subjected to EDS is 0.1 or more, The absolute values of DELTA x and DELTA y measured by the luminance meter may be 0.003 or less, respectively. As a result, the refractive index of the optical sheet can be increased to increase the brightness.

By further forming the coating layer 130, the diffusion effect of the optical sheet can be further enhanced, and there can be a moiré prevention effect due to the optical pattern layer. Except that a coating layer is further formed, and therefore only the coating layer will be described in the following.

The coating layer 130 may be formed of an ultraviolet curable resin, may have a thickness of 1 to 10 mu m, and may be used in the optical sheet in the above range.

The coating layer 130 may be formed with a light diffusion pattern, for example, a concavo-convex pattern. The concavo-convex pattern may be formed by a sand blasting method, a hot pressing method, a casting method of a transparent resin, or a method of dispersing fine particles on the back surface of a substrate film. For example, a method of transferring the concavo-convex pattern of the pulling roll produced by the sandblasting method in which irregularities are formed by striking the surface of the pulling roll with a bead having a diameter of 1 to 200 탆, to another side of the base film. Specifically, an ultraviolet curable resin is injected between a pull roll formed with a concavo-convex pattern and a base film so that the pull roll is allowed to pass over the base film while being in contact with the ultraviolet curable resin. At this time, it is possible to form the light-diffusing layer on the base film by curing the UV by irradiating the curable resin.

The composite optical sheet of the present invention may include the optical sheet of the embodiment of the present invention. A composite optical sheet according to an embodiment of the present invention will be described with reference to FIG.

4, the composite optical sheet 300 of the embodiment of the present invention includes a first optical film 310 including a first base film 305 and a first optical pattern layer 310 formed on the first base film 305, A sheet 320 and a second optical sheet 330 formed on the first optical sheet 320 and including a second optical pattern layer 330 on the second base film 335 and the second base film 335 340, and the first optical sheet 320 may include the optical sheet of the embodiment of the present invention.

The second optical sheet 340 emits light incident from the first optical sheet 320. FIG. 4 illustrates a case where the second optical pattern layer 330 includes a layer in which a triangle is a prism, 2 optical pattern layer is not limited thereto, and may include a prism having a polygonal cross section (a polygon having a number of sides of 4 to 10), a micro lens pattern, a lenticular lens pattern, an emboss pattern, or a combination thereof.

4, the longitudinal direction of the first optical pattern layer of the first optical sheet 320 is y1, the pitch direction thereof is x1, the longitudinal direction of the second optical pattern layer of the second optical sheet 340 is x2 , And y2 in the pitch direction, the angle formed by y1 and x2 may be 85 to 95 degrees, and preferably 90 degrees.

The first optical sheet 320 and the second optical sheet 340 are in a detachable state without being adhered to each other.

The second optical sheet 340 is formed on the first optical pattern layer 310 and can have a refractive index of 1.58 to 1.70, and can emit light in the above range with high brightness.

The second base film (335) may be formed of the same or different resin as the first base film (305).

The second optical pattern 330 may be formed of a conventional ultraviolet ray curing resin or may be formed of a composition for forming an optical pattern including the monomer of Formula 1 to increase the refractive index of the second optical sheet to emit light at a high luminance .

The composite optical sheet 300 may have a luminance gain value of 3.0% or more, for example, 3.0 to 5%, and may have a luminance improving effect in the above range. The luminance gain value of the composite optical sheet means a rate at which luminance is increased when the composite optical sheet is further included in the backlight unit for a liquid crystal display. The luminance gain value is obtained by sequentially stacking diffusion plates on the light guide plate, ), And a composite optical sheet was further laminated on the diffuser plate in the backlight unit for liquid crystal display used in the measurement of the luminance C (the base sheet of the first optical sheet was laminated on the diffuser plate The luminance D of the composite optical sheet can be obtained from the following equation (3): &quot; (1) &quot;

<Formula 3>

The luminance gain value of the composite optical sheet = (D-C) / C x 100

Although not shown in Fig. 4, the light guide plate may be disposed under the first optical sheet 320. Fig.

The optical display device of the present invention may include an optical sheet or a composite optical sheet of the embodiment of the present invention, and may be, for example, a liquid crystal display device. A liquid crystal display device according to an embodiment of the present invention will be described with reference to FIG. 5 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.

5, a liquid crystal display 400 according to an exemplary embodiment of the present invention includes a light source 410, a light guide plate 420 for guiding light emitted from the light source 410, a reflective sheet 420 disposed below the light guide plate 420, A diffusion sheet 430 disposed on the top of the light guide plate 420, a composite optical sheet 440 disposed on the top of the diffusion sheet 430, and a protective sheet 430 disposed on the top of the composite optical sheet 440, (460), and the composite optical sheet (440) may comprise a composite optical sheet of embodiments of the present invention.

A light source cover 410a may be disposed outside the light source 410 of the backlight unit. Here, although not shown, a liquid crystal display panel and an antireflection layer are sequentially stacked on the liquid crystal display device 400 to constitute a liquid crystal display device.

The light source 410 generates light, and various light sources such as a linear light source lamp, a planar light source lamp, a CCFL, or an LED may be used.

The light guide plate 420 guides the light generated by the light source 410 to the diffusion sheet 430, and may be omitted when a direct-type light source is employed.

The reflective sheet 450 reflects light generated from the light source 410 and supplies the light to the diffusion sheet 430.

The diffusion sheet 430 diffuses and scatters the light incident through the light guide plate 420 and supplies the light to the composite optical sheet 540.

The composite optical sheet 440 functions to refract light incident through the diffusion sheet 430 and condense the light onto a plane of a liquid crystal display panel (not shown). The composite optical sheet 440 may be formed of various shapes such as a shape of a light collecting portion and an angle of an inclined surface of a light collecting portion according to various design goals such as high condensing efficiency, wide viewing angle, prevention of moire phenomenon, And combinations thereof, are commercially available.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. However, the following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited to the following examples.

Production Example 1: (1) Preparation of the compound represented by the formula 4-1

A solution of phenylthiophosphonic dichloride (2.11 g, 10 mmol) in tetrahydrofuran (THF) (30 mL) was cooled to 0 ° C using an ice bath, and triethylamine triethylamine (1.14 g, 11 mmol). Next, a solution of 1.1 g (10 mmol) of thiophenol in 10 mL of THF was slowly added to the solution using a dropping funnel. 21.25 g of triethylamine and 210 mmol of triethylamine were added while maintaining the temperature at 0 ° C and a solution of 1.25 g (10 mmol) of 4-aminobenzenethiol in THF (6 mL) Was slowly added to the solution using a dropping funnel. When the addition was completed, the ice bath was removed, and the mixture was reacted by stirring for about 2 hours. After completion of the reaction, the reaction solution was filtered to remove amine salts, and the excess solvent was removed by distillation under reduced pressure. To the concentrated organic material was added 100 mL of ethyl acetate (EtOAC), washed with 80 mL of 5% hydrochloric acid (HCl) and 100 mL of an aqueous sodium hydroxide solution (aq. NaOH, 2M), and then the organic layer was distilled off under reduced pressure. Next, column chromatography _{(SiO 2, ethyl acetate: hexane} = 1: 2) to the final compound were isolated compound represented by the formula {4-1 colorless oil (colorless oil) with a yield of 85%, refractive index ^{(RI): 1.73, 1 H} -NMR (300 MHz, CDCl 3): δ 7.98-7.90 (m, 2H), 7.51-7.39 (m, 6H), 7.38-7.26 (m, 2H), 7.17-7.13 (m, 2 H), 6.59 - 6.55 (m, 2 H).

[Formula 4-1]

A solution of 2.62 g (7.02 mmol) of the compound of Formula 4-1 and 0.71 g (7.02 mmol) of triethylamine in 20 mL of THF was cooled to 0 ° C using an ice bath, , 0.64 g (7.02 mmol) of acryloyl chloride diluted with 8 mL of THF was added slowly, and the mixture was reacted at 0 DEG C for 1 hour with stirring. After completion of the reaction, the reaction solution was filtered to remove amine salts, and the excess solvent was removed by distillation under reduced pressure. To the concentrated organic material was added 100 mL of ethyl acetate (EtOAC), washed with 80 mL of 5% hydrochloric acid (HCl) and 100 mL of an aqueous sodium hydroxide solution (aq. NaOH, 2M), and then the organic layer was distilled off under reduced pressure. Next, the final compound, a compound represented by the following formula 1-1 was isolated using column chromatography (SiO ₂ , ethyl acetate: hexane = 1: 2) (white solid, yield: 78% refractive index ^{(RI): 1.72, 1 H} -NMR (300 MHz, CDCl 3): δ 7.98-7.93 (m, 2H), 7.53-7.51 (m, 3H), 7.45-7.39 (m, 5H), 7.38-7.25 (m, 5H), 6.42 (dd, J = 0.6, 10.2 Hz, 1H), 6.21 (dd, J = 6.3, 10.2 Hz, 1H), 5.77 (dd, J = 0.6, 6.3 Hz, 1H).

[Formula 1-1]

Production Example 2: (1) Preparation of the compound represented by the formula 4-2

Except that 1.26 g (10 mmol) of 4-hydroxybenzenethiol was used in place of 4-aminobenzenethiol in Production Example 1 (1), the same procedure as in Production Example 1 was repeated to give 4- 2 was prepared. The final compound is purified by column chromatography _{(SiO 2, ethyl acetate: hexane} = 1/4) were separated by using a {colorless oil (colorless oil), Yield: 72%, refractive index ^{(RI): 1.69, 1 H} -NMR (300 _{MHz, CDCl 3): δ 7.99-7.91} (m, 2H), 7.52-7.35 (m, 6H), 7.31-7.23 (m, 5H), 6.74 (dd, J = 1.5, 6.6 Hz, 2H)}.

[Formula 4-2]

(2) Production of a compound represented by the following formula (1-2)

(2) was prepared in the same manner as in Production Example 1, except that 2.19 g (5.8 mmol) of the compound of the formula (4-2) was used instead of the compound of the formula (4-1) Lt; / RTI &gt; The final compound is purified by column chromatography _{(SiO 2, ethyl acetate: hexane} = 1/5) were separated by using a {colorless oil (colorless oil), Yield: 78%, refractive index ^{(RI): 1.685, 1 H} -NMR (300 _{MHz, CDCl 3): δ 8.00-7.92} (m, 2H), 7.53-7.32 (m, 10H), 7.09 (dd, J = 1.5, 6.6 Hz, 2H), 6.60 (dd, J = 1.2, 17.1 Hz, 1H), 6.29 (dd, J = 10.5, 17.4 Hz, 1H), 6.02 (dd, J = 1.2, 10.5 Hz, 1H).

[Formula 1-2]

Measurement of refractive index: (1) When the prepared compound was in a liquid state, the organic solvent was completely removed, and then the product itself was measured on a refractometer (Model: 3T, And measured by spreading.

(2) When the prepared compound is a solid, it is diluted with a solvent (DMSO, refractive index: 1.479) in which the solid can be dissolved, and the product is refracted by using a refractometer (model: 3T, manufactured by ATAGO ABBE, : 589.3 nm D-light sodium lamp).

Specific specifications of the components used in Examples and Comparative Examples are as follows.

(A) Monomer of Formula (1): (A1) Monomer of Preparation Example 1, (A2) Monomer of Preparation Example 2

(B) Non-phosphorus monomer: HRI-84 (Daelim Chemical, refractive index: 1.602)

(C) a monomer containing a unit represented by the following formula (7): TBP-102 (monochemistry, refractive index: 1.553, n ₁ and n ₂ are 5, R ₁₆ and R ₁₇ are each phenylene, R ₁₈ is a monomer)

(D) Crosslinking agent: PN662NT (YSM special chemical, refractive index: 1.503)

(E) Initiator: TPO (BASF, refractive index: 1.6)

(F) Fluorine-based monomer having a refractive index of 1.602 and containing no sulfur and phosphorus: PBA-001 (Hansung Chemical).

Example 1

55 parts by weight of the component (A), 42 parts by weight of the component (B) and 3 parts by weight of the component (E) were mixed and stirred to prepare a composition for optical pattern formation. A composition for forming an optical pattern was coated on one surface of a PET (polyethylene terephthalate) film (MITSUBISHI, T910E, thickness: 75 mu m) for a transparent base film and the same height of 12 mu m, pitch of 24 mu m, A pattern was applied to the coating using a pattern roll having a triangular pattern formed thereon and cured at 350 mJ / cm ² to prepare an optical sheet.

Examples 2 to 4

An optical sheet was prepared in the same manner as in Example 1, except that the contents of the components (A) to (E) were changed to the following Table 1 (parts by weight).

Comparative Examples 1 to 2

An optical sheet was prepared in the same manner as in Example 1 except that the contents of the components (A) to (F) were changed to the following Table 1 (unit: parts by weight).

A F B C D E A1 A2 Example 1 55 - - 42 - - 3 Example 2 44 - - 50 - 3 3 Example 3 - 50 - 29 - 18 3 Example 4 - 40 - 24 30 3 3 Comparative Example 1 - - 25 24 45 3 3 Comparative Example 2 - - - 100 - - 3

The properties of the optical sheets prepared in Examples and Comparative Examples were evaluated in the following Table 2, and the results are shown in Tables 2, 6 and 7.

Refractive index Luminance gain (%) EDS
(P peak / C peak) The ratio of the height of the P peak to the height of the C peak in EDS EDS
(S peak / C peak) The ratio of the height of the S peak to the height of the C peak in EDS DELTA x, DELTA y Adhesion Transparency Yellow Example 1 1.6868 2.48 2700 /
1100 2.45 8200 /
1100 7.45 Good ○ Good 6.1 Example 2 1.6709 2.35 2400 /
1280 1.875 7400 /
1280 5.78 Good ○ Good 5.7 Example 3 1.6431 2.14 2200 /
1400 1.57 6800 /
1400 4.85 Good ○ Good 5.1 Example 4 1.6295 2.01 1800 /
1500 1.2 3200 /
1500 2.13 Good ○ Good 5.3 Comparative Example 1 1.5879 1.78 Less than 10 /
2400 Less than 0.004 Less than 10 /
2400 Less than 0.004 Good ○ Good 5.2 Comparative Example 2 1.6700 2.34 0/6400 0 0/6400 0 Bad × Good 5.6

As shown in Table 2 and FIG. 6, the optical sheet of the present invention has a high refractive index and a ratio of the height of the P peak to the height of the C peak of the optical sheet is 0.1 or more, and the luminance gain is high, , The adhesion between the base film and the optical pattern layer was high, and the prevention of yellowing and transparency were excellent.

On the other hand, Comparative Example 2 did not contain the monomer of the present invention (Formula 1), and there was a problem of adhesion.

In Comparative Example 1 including a fluorene monomer having a high refractive index instead of the monomer represented by the formula (1), as shown in Table 2 and FIG. 7, the ratio of the height of the P peak to the height of the C peak of the optical sheet was less than 0.1, There was a problem that the value was low.

(1) Refractive index: The refractive index of the optical pattern layer was measured using a refractometer (model name: 1T, Japan ATAGO ABBE). The light source for the measurement was a 589.3 nm D-light sodium lamp.

(2) Luminance gain 1: For a 3.97-inch liquid crystal display panel in which an LED lamp (samsung LED, 8 elements) is used as a light source and a light guide plate (3M ESR) and a diffusion plate (LMS, DLAS-38D) Using a backlight unit, the luminance at five points was measured using a luminance meter (model name: BM7 Japan TOPCON, current 20 mA), and an average value A was obtained. In the backlight unit for a 3.97-inch liquid crystal display panel in which the same light source was used and a light guide plate (3M company ESR) and a diffuser plate (LMS, DLAS-38D) were laminated in sequence, the optical sheets of the example and comparative example were further placed on the diffuser plate (The base film of the optical sheet was directed to the diffusion plate side), and the brightness at five points was measured using the same luminance meter, and the average value B was obtained. (B-A) / A x 100.

(3) EDS: A device for attaching a detector to an optical pattern layer by SEM (HITACHI, S-4800). Focusing on the surface of the sample and the electron beam, the content of element (carbon, phosphorus, sulfur, Oxygen, etc.) is expressed as Peak. Measure the gold pattern on the surface of the optical pattern layer before measurement. In a bell-jar which has been evacuated to about 10-4 to 10-7 torr by using a double vacuum deposition method using an Ion coater (Komec Co.), gold is put into a basket of a tungsten wire and the surface of the optical pattern layer is coated with gold by heat evaporation. The conditions for coating the surface of the optical pattern layer with gold are 50 mm for target size (gold / platinum), 220 V / 60 Hz / 500 W for power, 1 to 7 mA for ionization current, (D) x 330 (H), the chamber size was 100 mm in diameter, and the rotary pump was 100 liter / min.

(3M ESR), diffuser plate (LMS, DLAS-38D) and reference sheet 1.20B grade of LMS Co., Ltd. (4M) △ x and △ y: LED lamp (samsung LED, Using a backlight unit for a 3.97-inch liquid crystal display panel, which are sequentially stacked, using a luminance meter (model name: BM7 Japan TOPCON, current 20 mA). Using a backlight unit for a 3.97-inch liquid crystal display panel in which the same light source was used and a light guide plate (3M company ESR), a diffuser plate (LMS, DLAS-38D) and optical sheets of Examples and Comparative Examples were laminated in sequence The base film is directed to the diffusion plate side), and the measured x and y values are measured using a luminometer (model name: BM7 Japan TOPCON, current 20 mA). [Delta] x is obtained from the difference between the reference x value and the measured x value, and [Delta] y is obtained from the difference between the reference y value and the measured y value. When the absolute values of DELTA x and DELTA y are 0.003 or less and when the absolute values of DELTA x and DELTA y are respectively greater than 0.003, it is evaluated as bad.

(5) Adhesion force: A transparent PET substrate film was coated with a composition for forming an optical pattern, cured at 350 mJ / cm ² , and then cut by a cross hatch cutter in a width x length (10 x 10) , A tape (Nitto tape) was adhered onto the matrix, and the number of matrices separated from the transparent PET base film while vertically and strongly releasing was evaluated and repeated five times. O when the number of matrices separated from 100 of the matrix is 0, and X when the number of matrices separated from 100 of the matrix is 1 or more.

(6) Transparency: The composition for optical pattern formation is diluted with methyl ethyl ketone (MEK) to a concentration of 50%, and clear coating is performed on the polyethylene terephthalate film (PET) using # 3 BAR. When the transmittance of PET before coating is a and the transmittance of PET after coating is good, when (ba) / ax 100 is -1% to + 1%, when it is good, when it is less than -1% or when it is + 1% . The transmittance is measured at a wavelength of 380 to 780 nm.

(7) Yellowing: For the optical sheet, measure the initial yellowness using a yellow measuring instrument SMCM-H5K1 (three bright tron). The optical sheet was irradiated with ultraviolet light to a total cumulative light amount of 125 JW / m ² for 3,030 s at 4.125 mJ / s using a UV lamp having a wavelength of 340 nm at room temperature, and the degree of yellowness was measured after standing for 1 hour. Yellowing is evaluated from the difference (? YI) between the initial yellow tile. The lower the YI, the less yellowing.

Example 5

A first optical sheet was prepared in the same manner as in Example 1.

25 parts by weight of the component (A1), 24 parts by weight of the component (B), 45 parts by weight of the component (C), 3 parts by weight of the component (D) and 3 parts by weight of the component (E) Respectively. A composition for forming an optical pattern was coated on one surface of a PET (polyethylene terephthalate) film (MITSUBISHI, T910E, thickness: 75 mu m) for a transparent base film and the same height of 12 mu m, pitch of 24 mu m, A pattern was applied to the coating using a pattern roll having a pattern of triangular patterns, and the second optical sheet was prepared by curing at 350 mJ / cm ² .

A composite optical sheet was prepared by laminating second optical sheets on top of the first optical sheet, and crossing the prisms such that the longitudinal directions of the prisms were 90 ° to each other.

Examples 6 to 8 and Comparative Example 3

In Example 5, instead of using the first optical sheet produced by the method of Example 1, Example 6 is the same as Example 2 except that the first optical sheet is manufactured, Example 7 is the same as Example 3 Except that the first optical sheet was prepared in the same manner as in Example 8, and the first optical sheet was prepared in the same manner as in Example 4 except that the first optical sheet was prepared in the same manner as in Comparative Example 1 A composite optical sheet was prepared in the same manner.

The luminance gain 2 was measured for the composite optical sheets of Examples and Comparative Examples.

Luminance gain 2 (%) of upper and lower plates Example 5 3.51 Example 6 3.42 Example 7 3.24 Example 8 3.12 Comparative Example 3 2.84

As shown in Table 3, the composite optical sheet of the present invention had a high luminance gain 2 and thus was excellent in luminance improvement.

* Luminance gain 2: Backlight unit for 3.97-inch liquid crystal display panel, which uses a LED lamp (samsung LED, 8 elements) as a light source, a light guide plate (3M ESR) and a diffusion plate (LMS, DLAS-38D) , The luminance at five points was measured using a luminance meter (model name: BM7 Japan TOPCON Co., current 20 mA), and the average value C was obtained. In a backlight unit for a 3.97-inch liquid crystal display panel in which a same light source was used and a light guide plate (3M company ESR) and a diffuser plate (LMS, DLAS-38D) The sheets were further placed on each other (the base film of the first optical sheet was directed to the diffusion plate side), and the brightness at five points was measured using the same luminance meter to obtain an average value D. (D-C) / Cx100.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (23)

An optical sheet comprising a base film and an optical pattern layer formed on one surface of the base film,
Wherein the optical pattern layer has a refractive index of 1.62 or more,
The optical pattern layer preferably has a ratio of a height of a P peak to a height of a C peak when the optical dispersive X-ray spectroscopy (EDS)
Wherein the optical sheet has an absolute value of? X and? Y measured by a luminance meter of 0.003 or less. The optical sheet according to claim 1, wherein the optical sheet has a ratio of the height of the P peak to the height of the C peak when the EDS is in the range of 0.1 to 5. The optical sheet according to claim 1, wherein the optical sheet has a ratio of the height of the S peak / the height of the C peak when the EDS is 1 to 10. The optical sheet according to claim 1, wherein the base film has a refractive index of 1.5 to 1.7. The optical sheet according to claim 1, wherein the optical sheet has a luminance gain value of 2.0% or more. The optical sheet according to claim 1, wherein the optical pattern layer is formed from a composition for forming an optical pattern including a monomer represented by the following formula (1), a non-phosphorus monomer, and an initiator:
&Lt; Formula 1 >

R ₁ and R ₂ are each independently an alkylene group having 2 to 10 carbon atoms, an arylene group having 6 to 20 carbon atoms, an alkylarylene group or an arylalkylene group having 7 to 20 carbon atoms, Ar ₁ is a group having 6 to 10 carbon atoms X ₁ and X ₂ are each independently -O- or -S-, Y ₁ and Y ₂ are each independently a hydrogen atom, -OH, -SH, -NH ₂ or

(Wherein R ₃ is a hydrogen atom or a methyl group, X ₃ is -O- or -N (R) - (R is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms), and * At least one of Y ₁ and Y ₂ is

And the average values of n ₁ and n ₂ are independently 1 to 4). The optical sheet according to claim 6, wherein the monomer of Formula 1 has a refractive index of 1.65 or more. The optical sheet of claim 6, wherein the monomer of Formula 1 comprises a monomer of Formula 1a:
[Formula 1a]

(Wherein R ₃ , X ₁ , X ₂ , X ₃ , n ₁ and n ₂ are the same as defined in Formula 1). 7. The optical sheet according to claim 6, wherein the monomer of Formula 1 is an optical sheet comprising a monomer represented by Formula 1-1 or 1-2:
&Lt; Formula 1-1 >

(1-2)

. 7. The optical sheet according to claim 6, wherein the non-phosphorus monomer comprises a monofunctional or bifunctional (meth) acrylic monomer or a mixture thereof,
&Lt; Formula 6a &

Wherein R ₁₁ is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an arylalkyl group having 7 to 10 carbon atoms, R ₁₂ is an alkyl group having 1 to 10 carbon atoms, An arylene group having 6 to 10 carbon atoms, or an arylalkylene group having 7 to 10 carbon atoms),
<Formula 6b>

(In the formula 6b * is a binding site of an element, R _13, R ₁₄ are each independently C 1 -C 10 alkylene group, arylene group, an arylalkyl group having 7 to 10 of carbon number 6 to 10). The optical sheet according to claim 6, wherein the composition for forming an optical pattern further comprises at least one of a monomer containing an alkylene oxide unit represented by the following formula (7) and a crosslinking agent:
&Lt; Formula 7 >

(Wherein, * is the connecting site of the element, R ₁₅ is an alkylene group having 1 to 5 carbon atoms, and n is an integer of 1 to 10). 12. The optical sheet according to claim 11, wherein the monomer represented by the formula (7) comprises a monomer represented by the following formula (8)
(8)

(Wherein R ₁₆ and R ₁₇ are each independently an arylene group having 6 to 10 carbon atoms, an alkylarylene group having 7 to 20 carbon atoms, or an arylalkylene group having 7 to 20 carbon atoms, R ₁₈ is a single bond, -S-, -O-, -NR (R is hydrogen or an alkyl group having 1 to 5 carbon atoms), R ₁₉ and R ₂₀ are each independently hydrogen or a methyl group, n ₁ and n ₂ Are each independently an integer of 1 to 10). The optical sheet according to claim 11, wherein the crosslinking agent comprises a trifunctional or more (meth) acrylic monomer having an aromatic group. The optical sheet according to claim 1, wherein a coating layer is further formed on the other surface of the base film. A composition for forming an optical pattern comprising a monomer represented by the following formula (1), a non-phosphorus monomer and an initiator:
&Lt; Formula 1 >

R ₁ and R ₂ are each independently an alkylene group having 2 to 10 carbon atoms, an arylene group having 6 to 20 carbon atoms, an alkylarylene group or an arylalkylene group having 7 to 20 carbon atoms, Ar ₁ is a group having 6 to 10 carbon atoms X ₁ and X ₂ are each independently -O- or -S-, Y ₁ and Y ₂ are each independently a hydrogen atom, -OH, -SH, -NH ₂ or

(Wherein R ₃ is a hydrogen atom or a methyl group, X ₃ is -O- or -N (R) - (R is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms), and * At least one of Y ₁ and Y ₂ is

And the average values of n ₁ and n ₂ are independently 1 to 4). The composition for forming an optical pattern according to claim 15, wherein the monomer of Formula 1 has a refractive index of 1.65 or more. The composition for forming an optical pattern according to claim 15, wherein the non-phosphorus monomer comprises a monofunctional or bifunctional (meth) acrylic monomer or a mixture thereof,
&Lt; Formula 6a &

Wherein R ₁₁ is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an arylalkyl group having 7 to 10 carbon atoms, R ₁₂ is an alkyl group having 1 to 10 carbon atoms, An arylene group having 6 to 10 carbon atoms, or an arylalkylene group having 7 to 10 carbon atoms),
<Formula 6b>

(In the formula 6b * is a binding site of an element, R _13, R ₁₄ are each independently C 1 -C 10 alkylene group, arylene group, an arylalkyl group having 7 to 10 of carbon number 6 to 10). 16. The composition for forming an optical pattern according to claim 15, wherein the composition for forming an optical pattern further comprises at least one of a monomer containing an alkylene oxide unit represented by the following formula (7) and a crosslinking agent:
&Lt; Formula 7 >

(Wherein, * is the connecting site of the element, R ₁₅ is an alkylene group having 1 to 5 carbon atoms, and n is an integer of 1 to 10). The composition for forming an optical pattern according to claim 18, wherein the monomer of formula (7) comprises a monomer represented by formula (8)
(8)

(Wherein R ₁₆ and R ₁₇ are each independently an arylene group having 6 to 10 carbon atoms, an alkylarylene group having 7 to 20 carbon atoms, or an arylalkylene group having 7 to 20 carbon atoms, R ₁₈ is a single bond, -S-, -O-, -NR (R is hydrogen or an alkyl group having 1 to 5 carbon atoms), R ₁₉ and R ₂₀ are each independently hydrogen or a methyl group, n ₁ and n ₂ Are each independently an integer of 1 to 10). The composition for forming an optical pattern according to claim 18, wherein the crosslinking agent comprises a trifunctional or more (meth) acrylic monomer having an aromatic group. The first optical sheet, and
And a second optical sheet formed on the first optical sheet,
Wherein the first optical sheet comprises the optical sheet according to claim 1. The composite optical sheet according to claim 21, wherein the composite optical sheet has a luminance gain value of 3.0% or more. An optical display device comprising the optical sheet of claim 1 or the composite optical sheet of claim 21.

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