KR101759558B1 - Polarization plate and method for fabricating the same - Google Patents

Polarization plate and method for fabricating the same Download PDF

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KR101759558B1
KR101759558B1 KR1020150152552A KR20150152552A KR101759558B1 KR 101759558 B1 KR101759558 B1 KR 101759558B1 KR 1020150152552 A KR1020150152552 A KR 1020150152552A KR 20150152552 A KR20150152552 A KR 20150152552A KR 101759558 B1 KR101759558 B1 KR 101759558B1
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South Korea
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film
polymer
polarizing plate
thin film
polymer thin
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KR1020150152552A
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Korean (ko)
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KR20170050692A (en
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오성우
고정훈
손현성
김경미
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엘지디스플레이 주식회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0046—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by constructional aspects of the apparatus
    • B32B37/0053—Constructional details of laminating machines comprising rollers; Constructional features of the rollers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

The present invention forms a polarizing plate by forming a polymer thin film on one side of the PS film by applying a PS (Polystyrene) film and forming a brightness enhancement film (APF) on the other side of the PS film. The polarizing plate can simplify the manufacturing cost and process by bonding the polarizing plate including the PS film and the brightness enhancement film (APF) by a roll-to-roll method, Can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate,

The present invention relates to a polarizing film, and more particularly to a polarizing plate applied to a display device and a method of manufacturing the same.

Description of the Related Art [0002] Liquid crystal display (LCD), one of the flat panel display devices that have been attracting attention recently, is an element that changes the optical anisotropy by applying an electric field to liquid crystal having fluidity of liquid and crystal optical properties. Is small and bulky, and can be enlarged and fixed, and is widely used.

Therefore, liquid crystal displays (LCDs) are widely used as notebook personal computers and word processing displays, and the use of liquid crystal display devices is rapidly spreading and remarkably growing.

However, in order to continuously grow the liquid crystal display element, rationalization of the cost is an important factor. In particular, it is urgently required to reduce the cost by improving the yield as the number of defective products increases in a large-screen thin film resistor (TFT, active matrix) method or a super twist nematic (STN) method.

In a liquid crystal display element, a polarizing film is an essential and important component for providing a certain transmitted light and changing a color tone of transmitted light, and a polarizing film is attached to both sides of the liquid crystal panel such that the polarization axes thereof are orthogonal to each other.

The polarizing film is the most general polarizing element that transmits natural light having a vibration plane in all directions 360 degrees through only light having a vibration plane in a certain direction and absorbs the remaining light to obtain polarized light.

It is common to use an element that divides a polarized light component parallel to the incident plane into a polarized light component by using a polarizer (for example, a PVA polymer) having light absorption characteristics, and linearly polarized light and elliptically polarized light are obtained by the polarizer.

In order to achieve this, a suitable material is selected and processed in the form of a film according to the application, so as to have uniform polarization and high polarization efficiency.

The polarizing film can be classified into a multi-halogen polarizing film, a dye polarizing film, a metal polarizing film, a polyvinylene polarizing film, an infrared polarizing film and an extreme ultra-polarizing film depending on the kind thereof. However, as far as research and development is concerned, additional technology development is required, and polyhalogen (iodine) polarizing films and dye-based polarizing films have been commercialized and used industrially.

Such a polarizing film is a technology-intensive product which requires high transparency, ultraviolet ray absorbing property, water resistance, stability against dimensional and deformation, and abrasion resistance.

A polarizing plate structure to which a conventional polarizing film is applied will be described with reference to FIG.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic view showing a cross section of a polarizing plate to which a polarizing film according to a related art is applied.

1, the polarizing plate 1 according to the related art comprises a polyvinyl alcohol (PVA) film 10 treated with iodine and a polarizing plate 10 formed of the PVA film 10 A triacetate cellulose (hereinafter referred to as TAC) film 20 having excellent transparency, ultraviolet ray absorbing property and durability as well as stability and wear resistance with respect to dimensions and deformation, (Pressure Sensitive Adhesive) film 30 for attaching and protecting the PVA film and for attaching to the panel.

The TAC film 20 and the brightness enhancement film APF 50 are further provided with a brightness enhancement film APF 50 on the top of the TAC film 20, do.

Here, the polyvinyl alcohol (PVA) film 10 may be prepared by stretching in one direction and then adsorbing iodine (I) or a dichroic dye. At this time, the PVA film 10 has an absorption axis in a stretching direction and a transmission axis in a direction perpendicular to an absorption axis.

The TAC film 20 is for supporting the PVA film 10 and is positioned on one side or both sides of the PVA film 10 so that the PVA film 10 is durable in order to maintain mechanical strength and heat resistance and moisture resistance. .

FIG. 2 is a process flow chart schematically showing a polarizing plate manufacturing process to which a polarizing film according to the related art is applied.

As shown in FIG. 2, the polarizer manufacturing process according to the related art has the steps of cutting a polarizing plate 1 into a plurality of sheets in the form of a sheet, a step (S10) of cutting the plurality of polarizing plates 1) is rotated by 90 degrees so as to be joined to the brightness enhancement film (APF) 50 by a roll method and a step S20 of rotating the 90 degrees rotated polarizing plate 1 by a roll a step S30 of removing the release film of the brightness enhancement film APF and a step S40 of removing the release film of the brightness enhancement film APF The polarizing plate POL is manufactured in the form of a roll by bonding the polarizing plate and the brightness enhancement film APF through a sheet system and a roll system, (Step S60).

As described above, PVA film of a polarizing plate applied to a recent liquid crystal display is designed to have a thin thickness of 5 to 7 μm to minimize shrinkage and expansion due to changes in the external environment, thereby minimizing warping of the panel.

However, in general, a polymer film based on stretching is inevitably sensitive to temperature / humidity even if the thickness is thin, and the yield is decreased due to frequent breakage of the fabric due to reduction in thickness.

In addition, since the polarizing plate of the related art requires at least two steps since the polarizer plate or the brightness enhancement film (APF) is cut into a rolled form after cutting the original plate and rotating it by 90 degrees The manufacturing cost is increased correspondingly.

Further, when the polarizer plate or the brightness enhancement film (APF) is cut into a sheet to join the polarizer plate and the brightness enhancement film (APF) to each other, the entire area of the final product can not be utilized The effective area decreases and the yield decreases.

Further, in the case of the brightness enhancement film (APF), the transmission axis is formed to be the same as the progress direction of the original of the brightness enhancing film and is formed perpendicular to the transmission axis of the polarizing plate. Roll-to-roll bonding is not possible.

In the case of conventional coated polarizing plates, it is expected to have a long production time and difficulty in large-area production due to the use of a concentration transfer type liquid crystal (LLC) or a nano-structure. This is due to the fact that a concentration-shifting liquid crystal (LLC), which is a type of polarizing plate that is under development and is being developed and developed, is aligned in a direction to apply a shear force after being coated on a base substrate, and a nano structure In this method, it is necessary to form a pattern using UV curable resin (Resin) to form an absorption axis in a specific direction.

An object of the present invention to solve the problems described above is to provide a method of manufacturing a polarizing plate and a brightness enhancement film (APF) by joining a polarizing plate raw material and an APF raw material by a roll- And to provide a polarizing plate capable of improving the deflection characteristics of the display panel and a manufacturing method thereof.

According to an aspect of the present invention, there is provided a light emitting device comprising a PS (Polystyrene) film, a polymer thin film provided on one side of the PS film, a brightness enhancement film (APF) disposed on the other side of the PS film, And a PSA film disposed on the polymer thin film.

In the polarizing plate according to the present invention, a support film may further be provided between the polymer thin film and the PSA film.

In the polarizing plate according to the present invention, the polymer thin film may be a mixture layer of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer).

In the polarizing plate according to the present invention, the support film may be formed of a polymer coating film containing triacetyl cellulose (TAC), acryl or cycloolefin polymer (COP).

In the polarizing plate according to the present invention, the PS film may be a material having a property that the liquid crystal is oriented perpendicular to the rubbing direction.

According to another aspect of the present invention, there is provided a method of manufacturing a UV curable polymer, the method comprising: providing a PS (polystyrene) film; coating a UV curable polymer on one side of the PS film; Forming a polymer thin film on the other side of the PS film, and bonding a brightness enhancement film (APF) to the other side of the PS film.

In the polarizing plate manufacturing method according to the present invention, the step of forming the polymer thin film may further include forming a supporting film.

In the polarizing plate manufacturing method according to the present invention, the support film may be formed of a polymer coating film including triacetyl cellulose (TAC), acryl or COP (cycloolefin polymer).

In the method for producing a polarizing plate according to the present invention, the UV curable polymer may be a mixture layer of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer).

In the polarizing plate manufacturing method according to the present invention, the PS film may be a material having a property that the liquid crystal is oriented perpendicular to the rubbing direction.

In the polarizing plate manufacturing method according to the present invention, the transmission axis of the polymer thin film may coincide with the transmission axis of the brightness enhancement film (APF).

In the polarizing plate manufacturing method according to the present invention, the PS film and the brightness enhancement film may be bonded by a roll-to-roll method.

The polarizing plate manufacturing method according to the present invention may further include forming a PSA film on the other side of the polymer thin film.

The present invention relates to a UV curable polymer thin film, that is, Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer), using a polystyrene (PS) film as a base substrate and a rubbing process used in the manufacture of a conventional liquid crystal display Since the formed thin film can be aligned, the manufacturing process can be simplified compared to the conventional coating type polarizing plate manufacturing process.

In the present invention, since the UV curable polymer thin film to be coated, that is, the thin film composed of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) is oriented perpendicularly to the rubbing direction on the surface of the PS film, (APF) fabric can be directly bonded by roll-to-roll method without a step of cutting the polarizing plate or the brightness enhancement film (APF) into a sheet form at the time of manufacturing, Rise and manufacturing cost can be lowered.

Furthermore, the present invention aligns the thin film composed of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) by PS film rubbing instead of aligning iodine by conventional stretching, Accordingly, warping of the panel due to contraction and expansion of the polarizing plate can be minimized. In particular, since the thin film composed of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) is a stable polymer thin film through UV curing, it does not react sensitively to external environment, that is, temperature / humidity change. The polarizer can be realized, curl and wave, and panel warpage can be minimized.

1 is a schematic view showing a cross section of a polarizing plate to which a polarizing film according to the related art is applied.
FIG. 2 is a process flow chart schematically showing a polarizing plate manufacturing process to which a polarizing film according to the related art is applied.
3 is a schematic view showing a cross section of a polarizing plate to which a polarizing film according to the present invention is applied.
4 is a process flow chart schematically showing a polarizing plate manufacturing process to which a polarizing film according to the present invention is applied.
5 is a schematic view of a PS film used in a polarizing plate according to the present invention.
FIG. 6 is a schematic view illustrating a process of joining a PS film and a brightness enhancement film (APF) according to the present invention through a roll-to-roll process.
FIG. 7 is a schematic view illustrating a polarizing plate manufacturing process to which a PS film according to the present invention is applied.

Hereinafter, the structure of the polarizing plate to which the PS film according to the present invention is applied will be described in detail with reference to the accompanying drawings.

3 is a schematic view showing a cross section of a polarizing plate to which a polarizing film according to the present invention is applied.

The polarizing plate 100 according to the present invention is formed by stacking a plurality of films in order to ensure durability or mechanical strength of the polarizer. As shown in FIG. 3, the polarizing plate 100 includes a PS (polystyrene) film 110 as a base film, A polymer thin film 120 formed on one surface of the PS film 110 and a pressure sensitive adhesive (PSA) film 130 disposed on the polymer thin film 120.

A brightness enhancement film (APF) 150 may further be attached to the other surface of the PS film 110. The brightness enhancement film (APF) 150 may improve the brightness of the display panel.

The PS (Polystyrene) film 110 has a property that the liquid crystal is oriented perpendicular to the rubbing direction. At this time, the rubbing process used in manufacturing a conventional liquid crystal display can be applied by using the PS (polystyrene) film 110 as a base film. Therefore, this makes it possible to simplify the production process of the coated polarizer.

After rubbing the PS (Polystyrene) film 110, a mixture of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) is coated on the PS film 110 to form a polarizing plate And the absorption axis is formed perpendicular to the traveling direction by aligning the absorption axis perpendicular to the traveling direction.

The polymer thin film 120 is composed of a mixture of Dye, which is a UV-curable polymer, and RM (Reactive Mesogen: photo-curable liquid crystal polymer). In particular, the polymer thin film 120 forms a polymer thin film by UV irradiation on the mixture of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer). At this time, the polymer thin film imparts a polarization function to light and has the same optical function as the polarizing plate (Pol) of the film type.

In the case of a mixture layer of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) constituting the polymer thin film 120, since it is a stable polymer through UV curing, it does not react sensitively to changes in external environment, that is, temperature / A separate protective substrate may be removed. Accordingly, it is possible to realize a thin polarizing plate, curl and wave, and warpage of the panel can be minimized.

A release film (not shown) is attached to the surface of the PSA film 130 and a protective film (not shown) may be attached to the surface of the brightness enhancement film (APF) 150. At this time, the release film and the protective film are detached when the polarizer is attached to the final product.

The release film is a release treated by polyethylene terephthalate (PET) film. It should be transparent for inspection before shipment, have a small orientation angle, and have a small fly spec (optical foreign material). , It is required that silicon is easily adhered and workability is good when the silicon layer is applied and formed to obtain releasability.

The above protective film is generally used as a PET film and is subjected to a hard coating treatment, an antireflection treatment, or an antireflection treatment unless it deviates from the object of the present invention. The hard coating process is a technique for preventing the surface of the polarizing film from being damaged. The hard coating film is preferably made of a transparent protective film made of a suitable ultraviolet curable resin such as a resin having excellent hardness, On the surface. The release film and the protective film are used as a protective layer of the entire polarizing plate.

The polarizing plate 100 as described above is useful as its thickness is kept thin while its polarization performance is maintained, and it is required that the polarizing plate 100 has high light transmittance, ultraviolet ray absorbing property, water resistance, dimensional stability, abrasion resistance and the like.

A support film (not shown) may be further provided between the polymer thin film 120 and the PSA film 130. At this time, the support film is used as a protective layer of the PS film 110 including the polymer thin film 120. The support film may be formed of a polymer coating film including TAC (tri-acetyl cellulose), Acryl, or COP (Cyclo Olefin Polymer).

Since the transmission axis of the polymer thin film 120 and the transmission axis of the brightness enhancement film APF 150 are identical to each other, the polarizer plate including two PSF films 110 and the brightness enhancement film APF 150 can be joined by a roll-to-roll method.

As described above, the present invention aligns the thin film composed of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) by PS film rubbing instead of aligning iodine by conventional stretching, The warping of the panel due to the contraction and expansion of the polarizing plate can be minimized. In particular, since the thin film composed of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) is a stable polymer thin film through UV curing, it does not react sensitively to external environment, that is, temperature / humidity change. The polarizer can be realized, curl and wave, and panel warpage can be minimized.

A method of manufacturing a polarizer using the PS film according to the present invention will now be described with reference to FIGS. 4 and 5. FIG.

4 is a process flow chart schematically showing a polarizing plate manufacturing process to which a polarizing film according to the present invention is applied.

5 is a schematic view of a PS film used in a polarizing plate according to the present invention.

As shown in FIG. 4, a polarizing plate manufacturing method using a PS film according to the present invention provides a PS (polystyrene) film 110 used as a base film as a first step (S110). At this time, as shown in FIG. 5, the PS film 110 has the property that the liquid crystal is oriented perpendicular to the rubbing direction.

The rubbing process used in manufacturing a conventional liquid crystal display can be applied by using the PS (polystyrene) film 110 as a base film. Therefore, this makes it possible to simplify the production process of the coated polarizer.

Then, as a second step (S120), a rubbing process is performed on one surface of the PS film 110 so that the surface of the film has a predetermined directionality.

Next, as a third step (S130), a mixture of a UV curable polymer Dye and a RM (Reactive Mesogen: photo-curable liquid crystal polymer) is coated on one surface of the PS film 110 having a certain direction through a rubbing process. At this time, the absorption axis is formed to be perpendicular to the traveling direction by aligning the mixture of the UV curable polymer Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) perpendicularly to the traveling direction of the PS film, that is, the polarizer plate.

Then, as a fourth step (S140), a polymer thin film 120 is formed on the mixture of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) through UV irradiation. At this time, the polymer thin film 120 imparts a polarizing function to light and has the same optical function as the polarizing plate Pol of the film form.

In the case of a mixture layer of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) constituting the polymer thin film 120, since it is a stable polymer through UV curing, it is sensitive to external environment, , It is possible to delete the separate protection substrate. Accordingly, it is possible to realize a thin polarizing plate, curl and wave, and warpage of the panel can be minimized.

Next, as a fifth step (S150), a PSA film 130 is formed on one side of the polymer thin film 120.

Then, in a sixth step S160, the brightness enhancement film (APF) 150 is bonded to the other surface of the PS film 110 through the adhesive layer 140. [ Since the transmissive axis of the polymer thin film 120 and the transmissive axis of the brightness enhancing film 150 are identical to each other, the PS film 110 and the brightness enhancing film (APF) (Roll-to-Roll) method.

In a seventh step S170, a release film (not shown) and a protective film (not shown) are attached to each surface of the PSA film 130 and the brightness enhancement film (APF) 150 to form a polarizing plate 100, Thereby completing the polarizing plate manufacturing process. At this time, the release film and the protective film are detached when the polarizer is attached to the final product.

The release film is formed by polyethylene terephthalate (PET) film. The release film should be transparent for inspection before shipment, have a small orientation angle, have a small fly spec (optical foreign material) It is required that the silicon is easily adhered and the workability of the processing is good when the silicon layer is applied and formed in order to obtain the silicon layer.

The above protective film is generally used as a PET film and is subjected to a hard coating treatment, an antireflection treatment, or an antireflection treatment unless it deviates from the object of the present invention. The hard coating process is a technique for preventing the surface of the polarizing film from being damaged. The hard coating film is preferably made of a transparent protective film made of a suitable ultraviolet curable resin such as a resin having excellent hardness, On the surface. The release film and the protective film may be used as a protective layer of the entire polarizing plate.

The polarizing plate 100 as described above is useful as its thickness is kept thin while its polarization performance is maintained, and it is required that the polarizing plate 100 has high light transmittance, ultraviolet ray absorbing property, water resistance, dimensional stability, abrasion resistance and the like.

Meanwhile, in the fourth step S140, a step of forming a support film (not shown) after the polymer thin film 120 is formed may be further included. At this time, the support film (not shown) may be formed of a polymer coating film containing TAC (tri-acetyl cellulose), Acryl, or COP (Cyclo Olefin Polymer).

A method of manufacturing a polarizing plate according to the present invention, which is manufactured through a roll-to-roll process, will be described with reference to FIG.

FIG. 6 is a schematic view illustrating a process of joining a PS film and a brightness enhancement film (APF) according to the present invention through a roll-to-roll process.

6, the polarizing plate raw material including the PS film 110 fed from the first roll 171 passes through the first and second guide rolls 173 and 174, and the second roll 172, The raw material of the brightness enhancement film 150 fed from the first and second guide rollers 175 and 176 passes through the third and fourth guide rolls 175 and 176.

The polarizer plate including the PS film 110 and the raw material of the brightness enhancement film 150 are bonded to each other while passing through the fifth and sixth guide rolls 177 and 178 to form the polarizing plate 100.

Thus, the polarizing plate 100 according to the present invention is manufactured through the roll-to-roll process by the first to sixth guide rolls 173 to 178.

A method of manufacturing a polarizing plate by the roll-to-roll method will be described in more detail with reference to FIG.

FIG. 7 is a schematic view illustrating a polarizing plate manufacturing process to which a PS film according to the present invention is applied.

The rubbing process is performed on the surface of the PS film 110 fed from the first roll 171, as shown in Fig. At this time, a rubbing process is performed on one surface of the PS film 110 so that the surface of the film has a certain directionality. The PS film 110 has a property that the liquid crystal is oriented perpendicular to the rubbing direction.

Then, a mixture of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) is coated on one side of the PS film 110 having a certain direction through the rubbing process. At this time, the absorption axis is formed to be perpendicular to the traveling direction by aligning the mixture of the UV curable polymer Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) perpendicularly to the traveling direction of the PS film, that is, the polarizer plate.

Next, a polymer thin film 120 is formed on the mixture of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) through UV irradiation. At this time, the polymer thin film 120 imparts a polarizing function to light and has the same optical function as the polarizing plate Pol of the film form.

In the case of a mixture layer of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) constituting the polymer thin film 120, since it is a stable polymer through UV curing, it is sensitive to external environment, , It is possible to delete the separate protection substrate. Accordingly, it is possible to realize a thin polarizing plate, curl and wave, and warpage of the panel can be minimized.

Then, the PSA film 130 is formed on one side of the polymer thin film 120 while passing through the first and second guide rolls 173 and 174.

The brightness enhancement film (APF) 150 delivered from the second roll 172 is bonded to the other surface of the PS film 110 by the adhesive agent through the third guide roll 175. At this time, the transmission axis of the polymer thin film 120 may coincide with the transmission axis of the brightness enhancement film (APF) 150. The PS film 110 and the brightness enhancement film (APF) 150 are bonded to each other through a roll-to-roll process.

Then the protective film 162 delivered from the third roll 179 is adhered to the surface of the brightness enhancement film 150 while passing through the fifth guide roll 177, The polarizing plate 100 is formed by adhering the film 164 to the surface of the PSA film 130 through the sixth guide roll 178. At this time, the release film and the protective film are detached when the polarizer is attached to the final product.

The releasing film is a releasable film made of polyester (polyethylene terephthalate) film. It should be transparent for inspection before shipment, have a small orientation angle, have a small fly spec (optical foreign material) In order to obtain a silicon layer, it is required that silicon is easily adhered and workability is good when the silicon layer is applied.

The above protective film is generally used as a PET film and is subjected to a hard coating treatment, an antireflection treatment, or an antireflection treatment unless it deviates from the object of the present invention. The hard coating process is a technique for preventing the surface of the polarizing film from being damaged. The hard coating film is preferably made of a transparent protective film made of a suitable ultraviolet curable resin such as a resin having excellent hardness, On the surface. The release film and the protective film may be used as a protective layer of the entire polarizing plate.

The polarizing plate 100 to which the protective film 162 and the release film 164 are adhered is wound on the third roll 181 to complete the polarizing plate manufacturing process according to the present invention through the roll- do.

The polarizing plate 100 as described above is useful as the polarizing plate 100 maintains its polarization performance while its thickness is thinner, and it is required to have high light transmittance, ultraviolet ray absorbing property, water resistance, dimensional stability, wear resistance and the like.

As described above, the present invention uses a polystyrene (PS) film as a base substrate to form a UV curable polymer thin film, that is, Dye and RM (Reactive Mesogen: photo-curable Liquid crystal polymer) thin film can be aligned, so that the manufacturing process can be simplified compared to the conventional coating type polarizing plate manufacturing process.

In addition, since the UV curable polymer thin film, that is, Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) thin film is oriented perpendicularly to the rubbing direction on the surface of the PS film, The polarizing plate or the brightness enhancement film (APF) can be directly bonded by a roll-to-roll method without cutting the sheet into a sheet form, thereby simplifying the manufacturing process, The manufacturing cost can be lowered.

Furthermore, the present invention aligns the thin film composed of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) by PS film rubbing instead of aligning iodine by conventional stretching, Accordingly, warping of the panel due to contraction and expansion of the polarizing plate can be minimized. In particular, since the thin film composed of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer) is a stable polymer thin film through UV curing, it does not react sensitively to external environment, that is, temperature / humidity change. The polarizer can be realized, curl and wave, and panel warpage can be minimized.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

110: Polystyrene (PS) film 120: Polymer thin film
130: PSA film 140: adhesive layer
150: Brightness Enhancement Film (APF)

Claims (13)

PS (Polystyrene) film;
A polymer thin film on one side of the PS film;
A brightness enhancement film (APF) disposed on the other side of the PS film;
A pressure sensitive adhesive (PSA) film disposed on the lower surface of the polymer thin film,
The polymer thin film is composed of a mixture of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer)
Wherein the transmission axis of the polymer thin film coincides with the transmission axis of the brightness enhancement film (APF). The polarizer of claim 1, further comprising a support film between the polymer thin film and the PSA film. delete The polarizing plate according to claim 2, wherein a polymer coating film comprising TAC (tri-acetyl cellulose), Acryl, or COP (Cyclo Olefin Polymer) is used as the support film. The polarizing plate according to claim 1, wherein the PS film has a property that liquid crystals are oriented perpendicular to the rubbing direction. Providing a PS (polystyrene) film;
Coating a UV curable polymer on one surface of the PS film;
Irradiating the UV curable polymer with UV to form a polymer thin film; And
And bonding a brightness enhancement film (APF) to the other surface of the PS film,
The polymer thin film is made of a mixture of Dye and RM (Reactive Mesogen: photo-curable liquid crystal polymer)
Wherein the transmission axis of the polymer thin film coincides with the transmission axis of the brightness enhancement film (APF). The method of claim 6, further comprising forming a support film after forming the polymer thin film. [8] The method of claim 7, wherein the support film is made of a polymer coating film comprising triacetyl cellulose (TAC), acryl or cycloolefin polymer (COP). delete 7. The method of claim 6, wherein the PS film has a property that liquid crystals are oriented perpendicular to a rubbing direction. delete The method of claim 6, wherein the PS film and the brightness enhancement film are bonded together by a roll-to-roll method. The method of claim 6, further comprising forming a PSA film on the other side of the polymer thin film.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3006826B2 (en) 1995-06-19 2000-02-07 日本電気株式会社 Liquid crystal display device and method of manufacturing the same
JP2008547062A (en) 2005-06-27 2008-12-25 住友化学株式会社 Dichroic guest-host polarizer
JP2009192902A (en) * 2008-02-15 2009-08-27 Nitto Denko Corp Method of manufacturing optical film laminate
JP4554315B2 (en) 2004-09-22 2010-09-29 日東電工株式会社 Alignment film manufacturing method for aligning liquid crystal material, obtained alignment film, alignment liquid crystal film, optical film, and image display device
JP2013037353A (en) * 2011-07-12 2013-02-21 Sumitomo Chemical Co Ltd Polarizer and method for manufacturing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3006826B2 (en) 1995-06-19 2000-02-07 日本電気株式会社 Liquid crystal display device and method of manufacturing the same
JP4554315B2 (en) 2004-09-22 2010-09-29 日東電工株式会社 Alignment film manufacturing method for aligning liquid crystal material, obtained alignment film, alignment liquid crystal film, optical film, and image display device
JP2008547062A (en) 2005-06-27 2008-12-25 住友化学株式会社 Dichroic guest-host polarizer
JP2009192902A (en) * 2008-02-15 2009-08-27 Nitto Denko Corp Method of manufacturing optical film laminate
JP2013037353A (en) * 2011-07-12 2013-02-21 Sumitomo Chemical Co Ltd Polarizer and method for manufacturing the same

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