KR20150072993A - Module for liquid crystal display apparatus and liquid crystal display apparatus comprising the same - Google Patents

Abstract

The present invention relates to a module for a liquid crystal display device which includes a panel for the liquid crystal display device, a first polarizer which is formed on the upper side of the panel for the liquid crystal display device, and a second polarizer which is formed on the lower side of the panel for the liquid crystal display device, and the liquid crystal display device including the same. An optical film is formed on one side or both sides of the first polarizer and the second polarizer. In the optical film, TD heat shrinkage is larger than MD heat shrinkage. The TD of the optical film is the direction of 85 to 95 degrees when the MD of the polarizer is 0 degree.

Description

TECHNICAL FIELD [0001] The present invention relates to a module for a liquid crystal display device, and a liquid crystal display device including the same. BACKGROUND OF THE INVENTION < RTI ID =

The present invention relates to a module for a liquid crystal display device and a liquid crystal display device including the same.

A thinner module for thinning the entire module of a liquid crystal display device has recently been required. However, as the module is made thin, the liquid crystal display panel is warped by the polarizing plate, and the demand for a module having less warpage is increasing. Since the polarizing plate includes a polarizer and the polarizer is produced by stretching a polyvinyl alcohol film, heat shrinkage occurs in the stretching direction. When the polarizing plate is subjected to a stretching force in the stretching direction due to the polarizer and thermal stress is applied to the polarizing plate, Or a dimensional change of the panel may occur.

Conventionally, there is a method of controlling the heat shrinkage ratio of the polarizer in the direction of the absorption axis to prevent warpage of the polarizer. However, since the absorption axes of the upper polarizer and the lower polarizer are arranged perpendicular to the liquid crystal display panel, It is difficult to sufficiently improve the distortion of the liquid crystal display panel, thereby causing the deflection of the liquid crystal display panel to still occur. In this regard, Korean Patent Laid-Open Publication No. 2006-0050706 discloses a retardation film in which the difference between the width shrinkage ratio and the longitudinal shrinkage ratio of the film is 8% to 30%, a method for manufacturing the same, and a liquid crystal display device including the same.

An object of the present invention is to provide a module for a liquid crystal display device which is thin and can keep the polarization degree of the polarizer as it is and has low warpage.

The module for a liquid crystal display of the present invention comprises a panel for a liquid crystal display, a first polarizer formed on the panel for the liquid crystal display, and a second polarizer formed on the bottom of the panel for the liquid crystal display, Wherein at least one of the polarizer and the second polarizer includes an optical film on one side or both sides of the optical film, wherein the transverse direction heat shrinkage ratio of the optical film is larger than a machine direction heat shrinkage ratio of the MD, When the MD of 0 is < RTI ID = 0.0 > 0, < / RTI >

The difference between the TD heat shrinkage ratio and the MD heat shrinkage percentage of the optical film may be 0.09 to 0.79%.

The TD heat shrinkage rate may be 0.1 to 0.8%, and the MD heat shrinkage rate may be 0.01 to 0.3%.

The optical film may be formed on one surface of the second polarizer, and the module for a liquid crystal display device may have the following relationship:

<Formula 3>

-0.4% ≤ A _MD - | C _TD + B _TD |? + 0.4%

(A _MD is the MD thermal shrinkage of the first polarizer, C _TD is the TD heat shrinkage of the optical film, and B _TD is the TD heat shrinkage of the second polarizer).

The polarizer may have a MD heat shrinkage of 1% or less and a TD heat shrinkage of 0.5% or less.

At least one of an optical film, an adhesive layer, and a coating layer may be further formed on the other surface of the polarizer.

The liquid crystal display device of the present invention may include the liquid crystal display device module.

The present invention provides a module for a liquid crystal display device that is thin, has low warpage, and can maintain the polarization degree of the polarizer as it is.

1 is a cross-sectional view of a module for a liquid crystal display device according to an embodiment of the present invention.
2 is an exploded perspective view of a first polarizer, a second polarizer, and a fourth optical film of the module for a liquid crystal display device according to an embodiment of the present invention.
3 is a cross-sectional view of a module for a liquid crystal display device according to another embodiment of the present invention.
4 is a cross-sectional view of a module for a liquid crystal display of another embodiment of the present invention.
5 is a cross-sectional view of a module for a liquid crystal display of another embodiment of the present invention.
6 is a conceptual diagram of the bending measurement.

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. For the sake of clarity, in the drawings, parts not related to the description are omitted, and the same names and symbols are used for the same or similar components throughout the specification.

In the present specification, 'upper' and 'lower' are defined with reference to drawings, and 'upper' may be changed to 'lower' and 'lower' may be changed to 'upper' depending on viewing time.

In the present specification, 'MD heat shrinkage rate' means the MD side length of the film for a film of width x length x thickness (100 mm x 100 mm x 10 to 300 m), and the length of the MD side of the film after leaving the film at 85 deg. C for 500 hours The following equation 1 can be obtained,

<Formula 1>

MD heat shrinkage ratio = | b-a | / a x 100

When the TD side length of the film is c and the TD side length of the film is d after the film is allowed to stand at 85 DEG C for 500 hours for a film of width x length x thickness (100 mm x 100 mm x 10 to 300 mu m), 'TD heat shrinkage rate' Can be represented by the following formula 2,

<Formula 2>

TD heat shrinkage ratio = | d-c | / c x 100,

In the film, the width is defined as MD, and the length is defined as TD.

The module for a liquid crystal display of the present invention comprises a panel for a liquid crystal display, a first polarizer formed on the panel for the liquid crystal display, and a second polarizer formed on the bottom of the panel for the liquid crystal display, Wherein at least one of the polarizer and the second polarizer includes an optical film on one side or both sides of the optical film, the TD heat shrinkage rate of the optical film is larger than the MD heat shrinkage rate, and the TD of the optical film is 0 deg. Lt; RTI ID = 0.0 &gt; 85-95. &Lt; / RTI &gt; The warpage of the first polarizing plate and the second polarizing plate may be offset from each other with reference to the liquid crystal display panel in the above range to prevent warpage of the liquid crystal display panel.

In the liquid crystal display device, the absorption axis of the first polarizer and the absorption axis of the second polarizer are orthogonal to each other for visibility of the screen, and the polarizer has the stretching direction as the absorption axis, so that the first polarizer and the second polarizer are thermally shrunk when exposed to heat, Can occur.

However, in the module for a liquid crystal display of the present invention, when an optical film is formed on one surface of a polarizer, and the TD heat shrinkage rate of the optical film is made larger than the MD heat shrinkage rate and the TD of the optical film is 0 degree 85 to 95 deg., The warpage of the first polarizing plate and the second polarizing plate can be offset with respect to the liquid crystal display panel, thereby preventing warpage of the liquid crystal display panel.

On the other side of the polarizer, an optical functional film having the same physical properties as the optical film described above, an optical functional film not having the same physical properties as the above optical film, an adhesive layer, a coating layer and the like may be formed. An optical sheet such as a brightness enhancement film, a prism sheet, or the like.

On the other side of the polarizer, an optical functional film having the same physical properties as those of the optical film described above, an optical functional film not having the same physical properties as the optical film described above, an adhesive layer, a coating layer and the like may not be formed. That is, the polarizer may be a polarizer composed of a polarizer and an optical film.

Hereinafter, a liquid crystal display module according to an embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig. FIG. 1 is a cross-sectional view of a module for a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a first polarizer, a second polarizer and a fourth optical film in the module for a liquid crystal display device shown in FIG.

1 and 2, a module 100 for a liquid crystal display device according to an embodiment of the present invention includes a liquid crystal display panel 10, a first polarizer plate 20 formed on an upper portion of the liquid crystal display panel 10, The first polarizing plate 20 includes a first polarizer 21, a first optical film 22 formed on the upper portion of the first polarizer 21, and a second polarizing plate 30b formed on the lower portion of the panel 10, And a second optical film 23 formed on the lower portion of the first polarizer 21 and the second polarizer 30a includes a second polarizer 31 and a third optical film 23 formed on the upper portion of the second polarizer 31, And the fourth optical film 33 formed on the lower portion of the second polarizer 31. The fourth optical film 33 has a TD heat shrinkage rate larger than the MD heat shrinkage rate and the fourth optical film 33 The TD 33a of the second polarizer 31 may be in the 85 to 95 ° direction when the absorption axis 31a of the second polarizer 31 is 0 °.

The absorption axis 21a of the first polarizer 21 and the absorption axis 31a of the second polarizer 31 are orthogonal to each other and the TD heat shrinkage rate of the fourth optical film 33 is made larger than the MD heat shrinkage rate, The TD 33a of the fourth optical film 33 is in the 85 to 95 degree direction when the MD of the second polarizer 31 or the absorption axis 31a is 0 DEG, And the warpage of the second polarizer can be canceled out to prevent warpage of the liquid crystal display panel. Further, it is difficult to lower the warpage only by controlling the heat shrinkage ratios of the first polarizer and the second polarizer, but it is also possible to lower warpage of the thin panel by controlling the warpage by the optical film.

Specifically, the fourth optical film 33 may have a TD heat shrinkage ratio-MD heat shrinkage ratio of 0.09 to 0.79%, more specifically, 0.1 to 0.6%. In the above range, it is possible to suppress the occurrence of warp upon heat shrinkage of the polarizing plate have.

Specifically, the fourth optical film 33 may have a TD heat shrinkage ratio of 0.1 to 0.8%, and the MD heat shrinkage ratio may be 0.01 to 0.3%. In this range, it is possible to suppress the occurrence of warpage in the heat shrinkage of the polarizing plate .

The fourth optical film may be a TD stretched film to have a TD heat shrinkage ratio> MD heat shrinkage ratio. In a specific example, the fourth optical film may be a TD stretched film, MD / TD biaxially stretched but TD stretching ratio greater than MD stretching ratio. It may also be a tension-relaxed film after being stretched to give film stability.

The TD-only stretched film is a TD stretched film having a stretching ratio of 1 to 7, for example 2 to 7, and a stretching temperature of 50 to 200 占 폚. In this range, the fourth optical film has a TD heat shrinkage ratio> MD heat shrinkage ratio So that warping can be suppressed even in a thin-type panel.

The MD / TD biaxial stretching ratio of the MD / TD biaxial stretching ratio is greater than the MD stretching ratio, the stretching ratio is 1 to 7, preferably 2 to 7, and the stretching temperature is 50 to 200 deg. In the above range, the fourth optical film has a TD heat shrinkage ratio> MD heat shrinkage ratio so that warpage can be suppressed even in a thin panel.

The tension-relaxed film after stretching is subjected to TD stretching at a stretching ratio of 1 to 7, for example, 2 to 7 at a stretching temperature of 50 to 300 占 폚, followed by stretching at a temperature within a predetermined range, Tension-relaxed film. tension-relaxation, the film is stretched in TD, and crystallization and stabilization of the film can be realized by heat treatment. In an embodiment, for tension-relaxation, the heating may be carried out in an oven at 50 to 300 占 폚 for 1 second to 2 hours, and the TD stretching ratio may be greater than 0 and up to 3 times, specifically 0.1 to 2 times, 0.1 to 1 times.

The thickness of the fourth optical film may be 20 占 퐉 to 100 占 퐉. In the above range, it can be used for a polarizing plate for a liquid crystal display.

The fourth optical film is a transparent optical film, and may be a polyester-based or cyclic polyolefin-based film including cellulose-based, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate and the like including triacetyl cellulose Of at least one resin selected from the group consisting of a polycarbonate resin, a polyether sulfone resin, a polysulfone resin, a polyamide resin, a polyimide resin, a polyolefin resin, a polyarylate resin, a polyvinyl alcohol resin, a polyvinyl chloride resin, Can be a film.

The first polarizer 21 and the second polarizer 31 are molecularly oriented in a specific direction, so that only the light in a specific direction can be transmitted when the first polarizer 21 and the second polarizer 31 are mounted on the liquid crystal display device.

The first polarizer 21 and the second polarizer 31 can be produced by dyeing a polyvinyl alcohol-based film with iodine or a dichroic dye and stretching it by MD. Specifically, it is produced through a swelling process, a dyeing step, a stretching step and a crosslinking step. Methods of performing each step are commonly known to those skilled in the art.

By controlling the MD heat shrinkage ratio and the TD heat shrinkage ratio of each of the first polarizer and the second polarizer which affect the warp in the LCD panel, the warpage can be further lowered. Specifically, the MD thermal shrinkage ratio (A _MD ) of the first polarizer, the TD heat shrinkage ratio (B _TD ) of the second polarizer, and the TD heat shrinkage ratio (C _TD ) of the fourth optical film satisfy the following formula (3) The effect of suppressing the warping of the panel may be larger:

<Formula 3>

-0.4% ≤ A _MD - | C _TD + B _TD |? + 0.4%

A _MD - | C _TD + B _TD | is in the range of -0.4 to + 0.4%, there may be no phenomenon that the panel bends to either the first polarizer or the second polarizer.

When the TD heat shrinkage rate of the first polarizer is A _TD , A _MD > A _TD , A _MD may be 1% or less, for example, 0.5 to 1%, and A _TD may be 0.5% or less, 0.1 may be% to 0.4%, when referred to the MD thermal shrinkage rate of the second polarizer B _MD, and B _MD> B _TD, B _MD may be a 1%, for example 0.5 to 1%, B _{The TD} may be 0.5% or less, for example, 0.1 to 0.4%, and the MD heat shrinkage percentage of the fourth optical film may be C _MD , C _TD > C _MD and C _MD may be 0.5% or less, 0.01 to 0.3%, and the C _TD may be 1% or less, for example, 0.1 to 0.8%. In this range, it is possible to prevent warpage of the liquid crystal display panel including the first polarizing plate and the second polarizing plate.

The MD heat shrinkage and TD heat shrinkage of the first polarizer and the second polarizer can be controlled by controlling the stretching ratio and stretching temperature of the polyvinyl alcohol film from the polyvinyl alcohol film during the production of the polarizer, The second polarizer may be stretched by MD, the stretching ratio may be 4 to 7, and the stretching temperature may be 50 to 60 占 폚.

The thicknesses of the first polarizer and the second polarizer may be respectively 5 占 퐉 to 30 占 퐉. In the above range, it can be used for a polarizing plate for a liquid crystal display. The materials and thicknesses of the first polarizer and the second polarizer may be the same or different from each other.

The first optical film 22, the second optical film 23, and the third optical film 32 may be a film that protects the polarizer or has a retardation within a predetermined range.

The first optical film 22, the second optical film 23 and the third optical film 32 may have the same physical properties as the fourth optical film 33 and may not have the same physical properties.

The first optical film, the second optical film and the third optical film may be unstretched or stretched films. In the case of stretched films, heat shrinkage may occur depending on the stretching direction. However, by controlling the MD shrinkage ratio and the TD heat shrinkage ratio, It is possible to suppress the warping phenomenon. Specifically, the first optical film, the second optical film, and the third optical film have the MD heat shrinkage ratio of 0.01 to 0.3% and the TD heat shrinkage ratio of 0.1 to 0.8%, respectively, within the above range . The first optical film, the second optical film, and the third optical film having the MD heat shrinkage ratio and the TD heat shrinkage ratio may be made of a non-oriented film.

The first optical film, the second optical film, and the third optical film may each include a transparent optical film such as cellulose-based, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate and the like containing triacetyl cellulose Based, polyamide-based, polyimide-based, polyolefin-based, polyarylate-based, polyvinyl alcohol-based, polyvinyl chloride-based, polyvinylalcohol-based, And a film made of one or more of polyvinylidene chloride resins.

The first optical film, the second optical film, and the third optical film may each have a thickness of 1 탆 to 100 탆. In the above range, it can be used for a polarizing plate for a liquid crystal display.

The first polarizing plate and the second polarizing plate may each have a thickness of 10 탆 to 300 탆. In the above range, it can be used for a polarizing plate for a liquid crystal display. The first polarizing plate and the second polarizing plate may have a degree of polarization of 99.9% or more, for example, 99.99 to 99.999%, and a transmittance of 40% or more, for example, 42 to 48%. In the above-mentioned range, there may be no deterioration of the optical characteristics when the liquid crystal display device is mounted. The thickness, the degree of polarization, and the transmittance of the first polarizing plate and the second polarizing plate may be the same or different from each other.

Although not shown in FIG. 1, an adhesive layer may be formed between the polarizer and the optical film to increase the mechanical strength of the polarizing plate. The adhesive layer may include at least one of ordinary adhesives such as an aqueous adhesive, a pressure-sensitive adhesive, and a photocurable adhesive.

Although not shown in FIG. 1, the first polarizing plate and the second polarizing plate may be respectively attached to the liquid crystal display panel by a pressure sensitive adhesive. The pressure sensitive adhesive may be a conventional pressure sensitive adhesive known to those skilled in the art. For example, Can be used.

Although not shown in FIG. 1, the backlight unit for a liquid crystal display may be disposed on the top of the first polarizing plate or on the bottom of the second polarizing plate.

The liquid crystal display panel 10 includes a liquid crystal panel including a liquid crystal cell layer sealed between a first substrate and a second substrate. In one embodiment, the first substrate includes a color filter (CF) substrate (upper substrate) The substrate may be a TFT (Thin Film Transistor) substrate (lower substrate). The first substrate and the second substrate may be the same or different, and may be a glass substrate or a plastic substrate. The plastic substrate is made of polyethylene terephthalate (PET), polycarbonate (PC), polyimide (PI), polyethylene naphthalate (PEN), polyether sulfone (PES), polyarylate (PAR) and cycloolefin copolymer (COC) Or the like, but the present invention is not limited thereto. The liquid crystal cell layer may be a liquid crystal layer including an IPS (In Place Switching) mode, a FFS (Fringe Field Switching) mode, a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode liquid crystal. The liquid crystal display panel may be a thin type having a thickness of 0.2 cm to 0.5 cm.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 3 is a cross-sectional view of a module for a liquid crystal display device according to another embodiment of the present invention.

3, a liquid crystal display module 200 according to another embodiment of the present invention includes a liquid crystal display panel 10, a first polarizer 20 formed on the upper portion of the liquid crystal display panel 10, and a liquid crystal display panel 10 The first polarizing plate 20 includes a first polarizer 21, a first optical film 22 formed on the upper portion of the first polarizer 21, and a second polarizing plate 30b formed on the lower portion of the first polarizing plate 21, And a second optical film 23 formed on the lower portion of the polarizer 21. The second polarizer 30b includes a second polarizer 31 and a fourth optical film 33 formed on the upper portion of the second polarizer 31, And the third optical film 32 formed on the lower portion of the second polarizer 31. The fourth optical film 33 has the TD heat shrinkage rate larger than the MD heat shrinkage rate and the TD of the fourth optical film 33 And the absorption axis of the second polarizer 31 is 0 DEG. Except that the positions of the third optical film and the fourth optical film are changed from each other, are substantially the same as those of the module for a liquid crystal display of the embodiment of the present invention.

Hereinafter, a module for a liquid crystal display according to still another embodiment of the present invention will be described with reference to FIG. 4 is a cross-sectional view of a module for a liquid crystal display of another embodiment of the present invention.

4, a liquid crystal display module 300 according to another embodiment of the present invention includes a liquid crystal display panel 10, a first polarizer 20 formed on the upper portion of the liquid crystal display panel 10, The first polarizing plate 20 includes a first polarizer 21, a first optical film 22 formed on the upper portion of the first polarizer 21, and a second polarizing plate 30c formed on the lower portion of the first polarizer 21. [ And a second optical film 23 formed on the lower portion of the first polarizer 31 and the second polarizer 31. The second polarizer 30c includes a fourth optical film 33 ), And TD of the fourth optical film (33) is greater than MD thermal shrinkage and the TD of the fourth optical film (33) is 85 to 95 when the absorption axis of the second polarizer (31) Direction. Is substantially the same as the module for a liquid crystal display of the embodiment of the present invention except that the third optical film is not included.

Hereinafter, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. 5 is a cross-sectional view of a module for a liquid crystal display of another embodiment of the present invention.

5, a liquid crystal display module 400 according to another embodiment of the present invention includes a liquid crystal display panel 10, a first polarizer 20 formed on the upper portion of the liquid crystal display panel 10, and a liquid crystal display panel The first polarizing plate 20 includes a first polarizer 21, a first optical film 22 formed on the upper portion of the first polarizer 21, and a second polarizing plate 30d formed on the lower portion of the first polarizer 21. [ And the second polarizing plate 30d includes a second polarizing film 31 and a fourth optical film 33 formed on the upper portion of the second polarizing film 31 And the coating film 34 formed on the lower part of the second polarizer 31. The fourth optical film 33 has a TD heat shrinkage rate larger than the MD heat shrinkage rate and the TD 33a of the fourth optical film 33 Can be 85 to 95 degrees when the absorption axis 31a of the second polarizer 31 is 0 DEG. Is substantially the same as the module for a liquid crystal display of the embodiment of the present invention except that the coating layer 34 is formed. Hereinafter, the coating layer 34 will be described.

The coating layer 34 may be a cured product of an active energy ray-curable resin composition comprising an active energy ray-curable compound and a polymerization initiator. The coating layer can improve good adhesion to a polarizer, transparency, mechanical strength, thermal stability, moisture barrier properties, and durability.

The active energy ray curable compound may include at least one of a curable compound that is cationic polymerization, a radically polymerizable curable compound, a urethane resin, and a silicone resin. The cationic polymerizable curable compound may be an epoxy compound having at least one epoxy group in the molecule, or an oxetane compound having at least one oxetane ring in the molecule. The radical polymerizable curable compound may be a (meth) acryloyl compound having at least one (meth) acryloyloxy group in the molecule, and the "(meth) acryloyloxy group" may be an acryloyloxy group and / It can mean the solar time.

The epoxy compound may be at least one of a hydrogenated epoxy compound, an aliphatic epoxy compound, an alicyclic epoxy compound, and an aromatic epoxy compound, preferably a hydrogenated epoxy compound having no aromatic ring, an aliphatic epoxy compound , And an alicyclic epoxy compound.

The hydrogenated epoxy compound is obtained by selectively hydrogenating an aromatic epoxy compound under a pressure in the presence of a catalyst. The aromatic epoxy compound is, for example, diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, Bisphenol type epoxy resins such as diglycidyl ether of bisphenol S, novolak type epoxy resins such as phenol novolac epoxy resin, cresol novolak epoxy resin and hydroxybenzaldehyde phenol novolac epoxy resin, A polyfunctional epoxy resin such as glycidyl ether of phenylmethane, glycidyl ether of tetrahydroxybenzophenone, and epoxidized polyvinyl phenol.

The aliphatic epoxy compound may be an aliphatic polyhydric alcohol or a polyglycidyl ether of an alkylene oxide adduct thereof. More specifically, diglycidyl ether of 1,4-butanediol, diglycidyl ether of 1,6-hexanediol, triglycidyl ether of glycerin, triglycidyl ether of trimethylolpropane, diglycidyl ether of polyethylene glycol Polyglycidyl ethers of polyether polyols obtainable by adding one or more alkylene oxides to aliphatic polyhydric alcohols such as cyclic ethers, diglycidyl ether of propylene glycol, ethylene glycol, propylene glycol or glycerin, .

The alicyclic epoxy-based compound means an epoxy-based compound having at least one epoxy group bonded to an alicyclic ring. The 'epoxy group bonded to the alicyclic ring' has a structure represented by the following formula (1), wherein m is an integer of 2 to 5.

&Lt; Formula 1 >

Specifically, the alicyclic epoxy compound is 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl 3,4-epoxy-6-methylcyclo (3,4-epoxy cyclohexanecarboxylate), bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate, diethylene glycol bis (3,4-epoxycyclohexyl Methyl ether), ethylene glycol bis (3,4-epoxycyclohexylmethyl ether), 2,3,14,15-diepoxy-7,11,18,21-tetraoxaspiro [5.2.2.5.2.2] Epoxy, 1,5-dioxaspiro [5.5] undecane, 4-vinylcyclohexene dioxide, limonene dioxide, bis (2,3-epoxycyclohexyl) Cyclopentyl) ether, dicyclopentadiene dioxide, and the like.

The oxetane-based compound is a compound having at least one oxetane ring (quaternary ring ether) in the molecule, and examples thereof include 3-ethyl-3-hydroxymethyloxetane, 1,4-bis [ (3-ethyl-3-oxetanyl) methyl] ether, 3-ethyl-3- (2-methoxybenzyl) -Ethylhexyloxymethyl) oxetane, phenol novolak oxetane, and the like.

The radically polymerizable curable compound can realize a coating layer having excellent hardness and mechanical strength and high durability.

The radical polymerizable curable compound can be obtained by reacting two or more kinds of (meth) acrylate monomers having at least one (meth) acryloyloxy group in the molecule, a compound having a functional group and at least two (meth) acryloyloxy (Meth) acrylate oligomer having a period of not less than 10 minutes.

(Meth) acrylate monomers include monofunctional (meth) acrylate monomers having one (meth) acryloyloxy group in the molecule, difunctional (meth) acrylates having two (meth) acryloyloxy groups in the molecule (Meth) acrylate monomers having three or more (meth) acryloyloxy groups in the molecule.

The monofunctional (meth) acrylate monomer is preferably selected from the group consisting of tetrahydrofurfuryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2- or 3-hydroxypropyl (meth) (Meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, isobutyl (meth) (Meth) acrylate, dicyclopentenyl (meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate, phenoxyethyl ) Acrylate, dimethylaminoethyl (meth) acrylate, and the like.

The monofunctional (meth) acrylate monomers may be (meth) acrylate monomers having a carboxyl group, and specifically, 2- (meth) acryloyloxyethylphthalic acid, 2- (meth) acryloyloxyethylhexahydro Phthalic acid, carboxyethyl (meth) acrylate, 2- (meth) acryloyloxethylsuccinic acid, and the like.

The bifunctional (meth) acrylate monomers include alkylene glycol di (meth) acrylates, polyoxyalkylene glycol di (meth) acrylates, halogen-substituted alkylene glycol di (meth) acrylates, di Di (meth) acrylates of di (meth) acrylates, hydrogenated dicyclopentadiene or tricyclodecanedialanol, di (meth) acrylates of dioxane glycol or dioxanedialanol, bisphenol A or bisphenol F Di (meth) acrylates of an alkylene oxide adduct of bisphenol A, epoxy di (meth) acrylates of bisphenol A or bisphenol F, and the like.

The polyfunctional (meth) acrylate monomers having three or more functional groups include glycerin tri (meth) acrylate, trimethylol propane tri (meth) acrylate, ditrimethylol propane tri (meth) acrylate, ditrimethylol propane tetra (Meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa Methacrylate, and the like.

The (meth) acrylate oligomer may be a urethane (meth) acrylate oligomer, a polyester (meth) acrylate oligomer, or an epoxy (meth) acrylate oligomer.

In one embodiment, the active energy ray-curable compound comprises a mixture of an epoxy-based compound and an oxetane-based compound, wherein 40 to 95% by weight of the epoxy compound and 5 to 60% by weight of the oxetane- .

The polymerization initiator may include at least one of a photoradical polymerization initiator and a photocationic polymerization initiator.

The photoradical polymerization initiator may include, without limitation, conventional photoradical initiators capable of carrying out a photocurable reaction. For example, the photo radical initiator may include phosphorous, triazine, acetophenone, benzophenone, thioxanthone, benzoin, oxime, or mixtures thereof. In embodiments, a phosphorus photoinitiator, such as bisbenzoylphenylphosphine oxide, benzoyldiphenylphosphine oxide, or a mixture thereof, may be used.

The photo cationic polymerization initiator may be a conventional photo cationic initiator capable of carrying out a photo-curable reaction. For example, an onium salt of an onium ion and an onium salt of an anion may be used. Specific examples of the onium ion include dia, such as diphenyliodonium, 4-methoxydiphenyliodonium, bis (4-methylphenyl) iodonium, bis (4-tert- butylphenyl) iodonium, bis (dodecylphenyl) (Diphenylsulfonium) -phenyl] sulfide, bis [4- ((4-fluorophenylsulfonyl) phenyl] sulfide, triarylsulfonium such as thiodiphenylsulfonium, Phenyl] sulfide, [eta] 5-2,4- (cyclopentadienyl) [1,2,3,4,5,6-.eta.] Di (4- (2-hydroxyethyl) - (methylethyl) -benzene] -iron (1+). Specific examples of the anion include tetrafluoroborate (BF ₄ ^- ), hexafluorophosphate (PF ₆ ^- ), hexafluoroantimonate (SbF ₆ ^- ), hexafluoroarsenate (AsF ₆ ^- And chlorantimonate (SbCl ₆ ^- ).

The polymerization initiator may be included in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the total active energy ray-curable compound. Within this range, curing is sufficient, mechanical strength is high, and adhesion with the polarizer is good.

The active energy ray curable resin composition may further include conventional additives such as silicone leveling agents, ultraviolet absorbers, and antistatic agents. The additive may be included in an amount of 0.01 to 1 part by weight per 100 parts by weight of the total active energy ray-curable compound.

The thickness of the coating layer may be 0.1 to 10 mu m.

The liquid crystal display device of the present invention may include the liquid crystal display device module of the embodiments of the present invention.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Example  1 to 5

The MD thermal shrinkage and the TD heat shrinkage of the triacetyl cellulose (TAC) film resin are shown in Table 1 by stretching 1.1 to 1.5 in the MD direction, at a stretching ratio of 1 to 5 in the TD direction and at a stretching temperature of 50 to 200 deg. TAC film was prepared.

The polyvinyl alcohol film (VF-PS6000, manufactured by Kuraray Co., Japan, thickness: 60 탆) was stretched 3 times in MD direction at 60 캜, adsorbed iodine, and stretched 2 to 4 times in MD direction at 40 to 50 캜 in an aqueous boric acid solution A first polarizer and a second polarizer were produced.

A triacetylcellulose film (KC4DR-1, thickness 40 占 퐉, manufactured by Konica Corp.) was laminated on both sides of the first polarizer using a PVA water-based adhesive to prepare a first polarizing plate.

A triacetylcellulose film (KC4DR-1, thickness 40 μm) was attached to one side of the second polarizer and the TAC film of Table 1 was attached to the other side of the second polarizer using a PVA-based water-based adhesive to prepare a second polarizing plate. At this time, the MD of the second polarizer and the TD of the TAC film of Table 1 were laminated so as to have the angles shown in Table 1 below.

The first polarizing plate was adhered to the upper surface of the glass (200 mm x 150 mm x 0.5 cm, width x height x height) using an acrylic adhesive, and the second polarizing plate was adhered to the lower surface of the glass using an acrylic adhesive, And the MD of the first polarizer were orthogonal to each other to prepare a module specimen for a liquid crystal display device.

Example  6

A module specimen for a liquid crystal display was prepared in the same manner as in Example 1, except that a coating layer was used instead of a triacetyl cellulose film (KC4DR-1 manufactured by Konica Corp., thickness: 40 m) in the production of the second polarizer.

The coating layer was prepared by dissolving 60 parts by mass of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (CYRACURE UVR-6110, manufactured by Dow Chemical Company), 3 parts by mass of 3-ethyl-3-hydroxymethyloxetane , 40 parts by mass of AARON OXETAN OXP-101 (manufactured by Dainippon Ink and Chemicals, Inc.), 4,4'-bis [diphenylsulfonio] diphenyl sulfide bishexafluorophosphate based photo cationic polymerization initiator , 5 parts by mass of a UVACURE 1590 (trade name), and 0.2 parts by mass of a silicon leveling agent (SH710, manufactured by Toray Dowcon K.K.).

Example  7

The polyethylene terephthalate resin was melt-extruded, stretched in the TD direction by 6.1 times in the TD direction without being stretched in the MD direction, subjected to tension-relaxation at 150 占 폚 and crystallized and stabilized to prepare a polyethylene terephthalate film (thickness 80 占 퐉).

A polarizing plate was produced in the same manner as in Example 1, except that the polyethylene terephthalate film was used in place of the TAC film having the MD heat shrinkage ratio and the TD heat shrinkage ratio shown in Table 1 in the production of the second polarizer.

Comparative Example  1 to 3

A TAC film having a MD thermal shrinkage ratio and a TD heat shrinkage ratio shown in Table 1 was prepared by stretching triacetyl cellulose (TAC) film resin only in the MD direction, stretching ratio of 2 to 7, and stretching temperature of 50 to 200 ° C .

The polyvinyl alcohol film (VF-PS6000, manufactured by Kuraray Co., Japan, thickness: 60 탆) was stretched 3 times in MD direction at 60 캜, adsorbed iodine, and stretched 2 to 4 times in MD direction at 40 to 50 캜 in an aqueous boric acid solution A first polarizer and a second polarizer were produced.

A triacetylcellulose film (KC4DR-1, thickness 40 占 퐉, manufactured by Konica Corp.) was laminated on both sides of the first polarizer using a PVA water-based adhesive to prepare a first polarizing plate.

A triacetylcellulose film (KC4DR-1, thickness 40 μm) was attached to one side of the second polarizer and the TAC film of Table 1 was attached to the other side of the second polarizer using a PVA-based water-based adhesive to prepare a second polarizing plate. At this time, the MD of the second polarizer and the TD of the TAC film of Table 1 were laminated so as to have the angles shown in Table 1 below.

The first polarizing plate was adhered to the upper surface of the glass (200 mm x 150 mm x 0.5 cm, width x height x height) using an acrylic adhesive, and the second polarizing plate was adhered to the lower surface of the glass using an acrylic adhesive, And the MD of the first polarizer were orthogonal to each other to prepare a module specimen for a liquid crystal display device.

The module specimens were allowed to stand in an oven at 85 ° C for 500 hours, and the flexural strength was measured. Referring to FIG. 6, the deflection values are measured from the bottom 500 to the specimen in which the first polarizer 520, the glass 510, the second polarizer 530, and the TAC film 540 of Table 1 are sequentially stacked. The maximum height of warpage C was taken as a deflection value and measured using a height gauge.

In the module specimen, the TAC film, the first polarizer, and the second polarizer were separated and cut into a size of 100 mm x 100 mm (width x length), left in an oven at 85 ° C for 500 hours, and then cut using vernier callipers And the heat shrinkage ratio was measured according to the above Equations 1 and 2. The results are also shown in Table 1 below.

Angle (°) Deflection (mm) TD heat shrinkage of film
(%)  MD Thermal Shrinkage (%) of Film MD Thermal Shrinkage (%) of First Polarizer The TD heat shrinkage (%) of the first polarizer MD thermal shrinkage (%) of the second polarizer The TD heat shrinkage (%) of the second polarizer Example 1 90 8 0.30 0.15 0.80 0.20 0.80 0.22 Example 2 90 6 0.43 0.15 0.82 0.18 0.81 0.21 Example 3 90 5 0.52 0.15 0.80 0.22 0.84 0.18 Example 4 85 9 0.30 0.15 0.81 0.21 0.81 0.21 Example 5 95 10 0.30 0.15 0.83 0.21 0.83 0.21 Example 6 90 7 0.52 0.15 0.80 0.22 0.84 0.18 Example 7 90 6 0.78 0.23 0.80 0.22 0.84 0.18 Comparative Example 1 90 12 0.15 0.30 0.82 0.22 0.80 0.22 Comparative Example 2 90 15 0.15 0.43 0.79 0.23 0.81 0.21 Comparative Example 3 90 17 0.15 0.52 0.84 0.18 0.84 0.18

As shown in Table 1, Comparative Example 1 to Comparative Example 3 using the optical film having a heat shrinkage ratio in the MD direction> a heat shrinkage ratio in the TD direction had a high bending value, while the module for a liquid crystal display device of the present invention had a low bending value.

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 (9)

A liquid crystal display panel,
A first polarizer formed on the upper surface of the liquid crystal display panel,
And a second polarizer formed on a lower portion of the panel for the liquid crystal display device,
An optical film on one or both surfaces of the first polarizer and the second polarizer,
Wherein the optical film has a TD heat shrinkage rate greater than the MD heat shrinkage rate,
Wherein the TD of the optical film is in the range of 85 to 95 占 assuming that the MD of the polarizer is 0 占. The module for a liquid crystal display device according to claim 1, wherein the optical film has a difference between the TD heat shrinkage ratio and the MD heat shrinkage ratio of 0.09 to 0.79%. The module for a liquid crystal display device according to claim 1, wherein the TD heat shrinkage rate is 0.1 to 0.8% and the MD heat shrinkage rate is 0.01 to 0.3%. The optical film according to claim 1, wherein the optical film is at least one selected from the group consisting of cellulose, polyester, cyclic polyolefin, polycarbonate, polyether sulfone, polysulfone, polyamide, polyimide, polyolefin, Wherein the film is made of one or more resins selected from the group consisting of polyvinyl alcohol, polyvinyl chloride, and polyvinylidene chloride. The liquid crystal display according to claim 1, wherein the optical film is formed on one surface of the second polarizer,
Wherein the module for a liquid crystal display device has a relationship of the following formula 3:
<Formula 3>
-0.4% ≤ A _MD - | C _TD + B _TD |? + 0.4%
(A _MD is the MD thermal shrinkage of the first polarizer, C _TD is the TD heat shrinkage of the optical film, and B _TD is the TD heat shrinkage of the second polarizer). The liquid crystal display module according to claim 1, wherein the polarizer has a MD heat shrinkage of 1% or less and a TD heat shrinkage of 0.5% or less. The module for a liquid crystal display device according to claim 1, wherein at least one of an optical functional film, an adhesive layer, and a coating layer is further formed on the other surface of the polarizer. The module for a liquid crystal display device according to claim 7, wherein the optically functional film is a retardation film, a brightness enhancement film, or a prism sheet. A liquid crystal display device comprising the liquid crystal display module according to any one of claims 1 to 8.

Images