KR100766179B1 - A diffuser-patterned broadband reflection typed brightness enhancement polarizer, the manufacturing method thereof and a liquid crystal display having the same - Google Patents

Abstract

The present invention relates to an integrated broadband reflective high brightness polarizing plate having a diffusion pattern, a method of manufacturing the same, and a liquid crystal display device having the same. The method of manufacturing the integrated broadband reflective high brightness polarizing plate of the present invention is (S1) each having a different selective reflection wavelength. Preparing a plurality of cholesteric liquid crystal films formed to have an area; (S2) stacking the plurality of cholesteric liquid crystal films to produce a laminated cholesteric liquid crystal film having a broadband selective reflection wavelength region; (S3) manufacturing a broadband reflective polarizer by laminating the λ / 4 retardation film on one surface of the laminated cholesteric liquid crystal film; (S4) coating a photocurable resin liquid on the surface of the λ / 4 retardation film; And (S5) irradiating light while passing the surface coated with the photocurable resin liquid through the roll on which the diffusion pattern is etched to form a diffusion pattern coating film. The integrated broadband reflective high brightness polarizer manufactured according to the manufacturing method of the present invention not only significantly reduces the luminance loss, but also the diffusion pattern coating film formed on one surface of the polarizing plate is integrated with the polarizing plate, thereby preventing light loss at the interface. Therefore, the brightness of the liquid crystal display device can be maximized. In addition, the manufacturing method of the present invention is economical because the manufacturing process can be shortened and the defect rate can be reduced.

Description

Integrated broadband reflective high brightness polarizer with diffusion pattern, manufacturing method thereof and liquid crystal display having same

1 is a cross-sectional view showing the structure of an integrated broadband reflective high brightness polarizer having a diffusion pattern according to an embodiment of the present invention;

2 is a process chart showing a process of forming a diffusion pattern in the manufacturing method of the present invention,

3 is a selective reflection region spectrum of a laminated cholesteric liquid crystal film used in an integrated broadband reflective high brightness polarizer according to an exemplary embodiment of the present invention.

The present invention relates to a broadband reflective polarizer having a laminated cholesteric liquid crystal film in which a plurality of cholesteric liquid crystal films formed to have different selective reflection wavelength ranges, a manufacturing method thereof, and a liquid crystal display device having the same. More particularly, the present invention relates to an integrated broadband reflective high brightness polarizing plate having a diffusion pattern formed on one surface of a broadband reflective polarizing plate, a manufacturing method thereof, and a liquid crystal display device having the same.

Display panels are widely used in display devices such as electronic calculators, electronic clocks, car navigation systems, office automation devices, mobile phones, laptop computers, and information communication terminals. For example, liquid crystal displays have transparent electrodes and alignment layers formed therein. The liquid crystal is injected between the opposing upper panel and the lower panel. Since the liquid crystal display device currently used uses linear polarization, the absorption type polarizing film is arrange | positioned before and behind a panel, and is used.

Absorption-type polarizing film is usually produced by adsorbing iodine or dichroic dye on a polyvinyl alcohol film and stretching it in a certain direction. The polarizing film thus prepared has weak mechanical strength in the direction of the transmission axis and shrinks due to heat or moisture. There is a disadvantage that the polarization function is significantly reduced. Therefore, it is used by the structure which adhere | attached with the adhesive agent between support bodies, such as a cellulose acetate film. As described above, the absorption type polarizing film using the polyvinyl alcohol film absorbs light vibrating in one direction and passes only the light vibrating to the other to make linearly polarized light. Therefore, the efficiency of the polarizing film cannot theoretically exceed 50%. This is a major cause of lowering the efficiency and brightness of the LCD.

On the other hand, if the reflective polarizing film manufactured using the cholesteric liquid crystal is further used between the liquid crystal panel having the absorption type polarizing film and the reflecting plate, the disadvantages of the absorption type polarizing film described above can be improved. The cholesteric liquid crystal has a selective reflection characteristic in which the twisted direction of the helical structure of the liquid crystal coincides with the circular polarization direction, and the wavelength reflects only circular polarized light such as the spiral pitch of the liquid crystal. By using this selective reflection characteristic, it is possible to manufacture a polarizing plate which converts unpolarized light of a certain wavelength band into a specific circularly polarized light. That is, when non-polarized light in which left circularly polarized light and right circularly polarized light are mixed in half is incident on a cholesteric liquid crystal film having a leftward or preferential spiral structure, circularly polarized light such as a spiral direction is reflected and circularly polarized light in the opposite direction is Is transmitted. At this time, the transmitted circularly polarized light is changed into linearly polarized light while passing through the λ / 4 retardation film. On the other hand, the reflected circularly polarized light is changed by the polarization direction upon re-reflection in the reflecting plate, thereby transmitting the liquid crystal film. Therefore, the additional use of a polarizing film made of a cholesteric liquid crystal film can theoretically make the luminance always remarkable since there is no loss of light in theory.

However, since the backlight used in the liquid crystal display generates light in the visible light band (400 to 700 nm), which is mainly a color display area, the selective reflection area of the cholesteric liquid crystal film must cover the visible light area. If not, light transmitted through the polarizing film in a non-polarized state is present, which degrades the image quality of the liquid crystal display. Since only one cholesteric liquid crystal film does not cover all of these visible light bands, a plurality of cholesteric liquid crystal films formed to have different selective reflection wavelength ranges as disclosed in Korean Patent Laid-Open Publication No. 1999-65280 A laminated cholesteric liquid crystal film laminated is used.

On the other hand, the backlight unit of the liquid crystal display device is used by assembling a variety of functional films overlapping, in this case, each time passing through each film light scattering phenomenon occurs at the interface, the brightness is lowered. In particular, the diffusion film to improve the viewing angle characteristics by diffusing the light generated from the light source has a problem in that the defect rate is also increased due to scratches or contamination by foreign matters when assembled into the backlight unit.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an integrated broadband reflective high brightness polarizing plate having a significantly reduced luminance loss as compared to a conventional polarizing plate and a liquid crystal display device having the same.

Another technical problem to be achieved by the present invention is that the selective reflection wavelength range of the cholesteric liquid crystal films constituting the broadband reflective polarizer is wide so that only a plurality of liquid crystal films can be stacked to cover all visible light regions, and the diffusion film The present invention also provides an integrated broadband reflective high brightness polarizer and a liquid crystal display device having the same.

Another technical problem to be achieved by the present invention is to provide a method for manufacturing an economical integrated broadband reflective high brightness polarizing plate which can shorten the manufacturing process and reduce the defective rate.

In order to achieve the above technical problem, the integrated broadband reflective high brightness polarizing plate having the diffusion pattern of the present invention comprises: (a) a broadband reflective polarizing plate having the following (i) and (ii); And (i) a laminated cholesteric liquid crystal film in which a plurality of cholesteric liquid crystal films formed to have different selective reflection wavelength regions are laminated, and (ii) λ / 4 laminated on one surface of the laminated cholesteric liquid crystal film. Retardation film, (b) It is provided with the diffusion pattern coating film formed in the surface of the (lambda) / 4 phase (s) difference film.

In the integrated broadband reflective high brightness polarizing plate of the present invention, the laminated cholesteric liquid crystal film is selected differently by varying the mixing ratio of the curable nematic liquid crystal compound represented by the following formula (1) and the curable chiral compound represented by the following formula (2): Characterized in that a plurality of cholesteric liquid crystal films formed to have a reflective wavelength region is laminated.

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In order to achieve another technical problem of the present invention, the method of manufacturing an integrated broadband reflective high brightness polarizing plate having a diffusion pattern of the present invention (S1) is a plurality of cholesteric liquid crystal films formed to have different selective reflection wavelength range Preparing; (S2) stacking the plurality of cholesteric liquid crystal films to produce a laminated cholesteric liquid crystal film having a broadband selective reflection wavelength region; (S3) manufacturing a broadband reflective polarizer by laminating the λ / 4 retardation film on one surface of the laminated cholesteric liquid crystal film; (S4) coating a photocurable resin liquid on the surface of the λ / 4 retardation film; And (S5) irradiating light while passing the surface coated with the photocurable resin liquid through the roll on which the diffusion pattern is etched to form a diffusion pattern coating film.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a cross-sectional view schematically illustrating a structure of an integrated broadband reflective high brightness polarizer having a diffusion pattern, respectively, according to an embodiment of the present invention. Referring to FIG. 1, the integrated broadband reflective high brightness polarizer 10 of the present invention is (a) a broadband reflective polarizer, and (i) a plurality of cholesteric liquid crystal films formed to have different selective reflection wavelength ranges. The laminated cholesteric liquid crystal film 11 and (ii) the laminated cholesteric liquid crystal film 11 are provided with (lambda) / 4 phase difference film 13 laminated | stacked on one surface, (b) said (lambda) / 4 phase difference The diffusion pattern coating film 15 formed on the surface of the film 13 is provided.

(a) Broadband Reflective Polarizer

(i) Laminated cholesteric liquid crystal film (11)

As described above, the laminated cholesteric liquid crystal film 11 is formed by stacking a plurality of cholesteric liquid crystal films formed to have different selective reflection wavelength regions.

As shown in FIGS. 1A and 1B, the laminated cholesteric liquid crystal film 11 has a structure in which cholesteric liquid crystal films 11a, 11b, and 11c having different selective reflection wavelength regions are stacked. The selective reflection wavelength range is changed by changing the mixing ratio of the curable nematic liquid crystal compound and the curable chiral compound. Known nematic liquid crystal compounds and curable chiral compounds used to produce cholesteric liquid crystal films can be used in the present invention. In particular, the width of the selective reflection wavelength region of the cholesteric liquid crystal film formed when the cholesteric liquid crystal film is formed by using the curable nematic liquid crystal compound represented by the following Chemical Formula 1 and the curable chiral compound represented by the following Chemical Formula 2 Since this becomes very wide, even if only a few liquid crystal films are stacked, all visible light regions can be covered.

<Formula 1>

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<Formula 2>

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That is, the width of the selective reflection region of the cholesteric liquid crystal film depends on the nematic liquid crystal compound. When the cholesteric liquid crystal film is manufactured using the curable nematic liquid crystal compound of Formula 1, the width of the selective reflection region is large. Rick liquid crystal film can be manufactured. Accordingly, since only a small number of cholesteric liquid crystal films may be stacked to cover all visible light regions, a high-brightness polarizer having a small thickness and economical efficiency may be provided. On the other hand, since the curable chiral compound of Formula 2 is excellent in compatibility with the curable nematic liquid crystal compound of Formula 1, it contributes to the improvement of the polarization characteristics of the cholesteric liquid crystal film.

In the laminated cholesteric liquid crystal film 11, the selective reflection wavelength region of the cholesteric liquid crystal films 11a, 11b, and 11c is determined according to the mixing ratio of the curable nematic liquid crystal compound and the curable chiral compound. For example, when the cholesteric liquid crystal film is formed, the curable nematic liquid crystal compound represented by the following Chemical Formula 1 and the curable chiral compound represented by the following Chemical Formula 2 are used, and the central wavelength of the selective reflection wavelength region of the cholesteric liquid crystal films is 450, respectively. If the mixing ratio is adjusted to be ~ 480 nm, 530-550 nm and 590-630 nm, only the three cholesteric liquid crystal films can be stacked to cover the visible light region efficiently.

(ii) λ / 4 retardation film (13)

On one surface of the laminated cholesteric liquid crystal film 11, a? / 4 phase difference film 13 for changing circularly polarized light into linearly polarized light is laminated. As the λ / 4 retardation film, a conventional λ / 4 retardation film manufactured using PVA, PC, m-COC, or the like may be used, and a retardation film having a refractive index in the thickness direction greater than that in the planar direction (Japanese Patent No. 2612196, 2994013, 2818983, 3309452, 3168850, etc.).

(b) Diffusion Pattern Coating Film 15

As shown in FIG. 1, the diffusion pattern coating film 15 is formed on one surface of the λ / 4 retardation film. The diffusion pattern coating film 15 serves as a diffusion film that was conventionally assembled and used separately in the backlight unit. That is, the diffusion pattern coating film 15, like the conventional diffusion film, is formed with a pattern that can diffuse the light incident on the surface to improve the viewing angle characteristics. It is appropriate that the refractive index of the diffusion pattern coating film is 1.46 or more and the haze is about 40 to 95% in that it replaces the function of the conventional diffusion film.

The integrated broadband reflective high brightness polarizer of the above-described structure not only significantly reduces the luminance loss, but also the diffusion pattern coating film formed on one surface of the polarizer is integrated with the polarizer to prevent light loss at the interface.

Looking at the manufacturing method of the integrated broadband reflective high brightness polarizing plate of the present invention, for example, as follows.

First, a plurality of cholesteric liquid crystal films formed to have different selective reflection wavelength regions are prepared (step S1).

As described above, the selective reflection wavelength region of the cholesteryl liquid crystal film may be determined by changing the mixing ratio of the curable nematic liquid crystal compound and the curable chiral compound. In more detail, a predetermined curable nematic liquid crystal compound and a predetermined curable chiral compound are dissolved in an organic solvent together with a photoinitiator at a predetermined ratio, roll coated onto a substrate, and then passed through a dryer to dry the solvent to orient the liquid crystal material. Next, a cholesteric liquid crystal film having a predetermined selective reflection wavelength region is manufactured by UV irradiation. In the same manner, cholesteric liquid crystal films having different selective reflection wavelength ranges are prepared by varying the mixing ratio of the curable nematic liquid crystal compound and the curable chiral compound. In particular, it is preferable to prepare cholesteric liquid crystal films having different selective reflection wavelength ranges by changing the mixing ratio of the curable nematic liquid crystal compound represented by Formula 1 and the curable chiral compound represented by Formula 2, The reason is as described above.

Subsequently, a plurality of cholesteric liquid crystal films having different selective reflection wavelength regions are stacked to prepare a laminated cholesteric liquid crystal film having a wide band selective reflection wavelength region (step S2). The lamination method is not limited as long as it can integrate each cholesteric liquid crystal film, but it is convenient to laminate each other using an adhesive.

Then, by laminating the lambda / 4 phase difference film on one surface of the prepared cholesteric liquid crystal film to prepare a broadband reflective polarizer (step S3). It is convenient to use the method of laminating retardation film using an adhesive as well.

Subsequently, the photocurable resin liquid is coated on the surface of the λ / 4 retardation film (step S4). As the photocurable resin solution, it is preferable to use a liquid resin solution composed of monomers or oligomers which can be photocured without using a solvent. For example, a solution in which an acrylate monomer and an additive are formulated can be used. In particular, as the photocurable resin liquid, it is more preferable to use a resin which is cured by ultraviolet rays and electron beams as an oligomer or monomer having a structure containing a lot of benzene rings and mixtures thereof, and various monomers having aromatic groups can be used. Examples include an oligomer having an aromatic group such as bisphenol A polyphenylene diacrylate, dibromo bisphenol A polyethoxylate diacrylate oligomer, 2-hydroxy-3-phenoxy-propyl acrylate, bisphenol A Monomers having an aromatic group, such as diethylene diacrylate, may be used alone or in combination. A photoinitiator for curing the oligomer and / or monomer may be added to the composition. As a coating method, a resin solution having a predetermined thickness may be coated on the substrate using a gravure roll coater or a comma coater. At this time, the thickness of the coating liquid to be raised on the substrate film through the coater is preferably 10 to 45 μm, more preferably. Preferably it is 15-25 micrometers.

Finally, light is irradiated while passing the surface coated with the photocurable resin liquid through the roll on which the diffusion pattern is etched to form a diffusion pattern (step S5). 2 shows a process of forming a diffusion pattern. Referring to FIG. 2, the surface coated with the photocurable resin liquid passes through a roll in which the diffusion pattern is etched, and the etched diffusion pattern presses the photocurable resin solution to form a pattern. On the other hand, the light irradiation apparatus on the opposite side of the roll is irradiated with light to fix the shaped pattern.

Hereinafter, examples will be described in detail to help understand the present invention. However, embodiments according to the present invention can be modified in many different forms, the scope of the invention should not be construed as limited to the following examples. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

Preparation of Laminated Cholesteric Liquid Crystal Film

Preparation Example 1

Three cholesteric liquid crystal films each having a different selective reflection wavelength range were prepared. The curable nematic liquid crystal compound (LC1057 from BASF) and the curable chiral compound (LC756 from BASF) were dissolved in cyclopentanone at a concentration of 30% by weight. The content of the curable chiral compound added in the preparation of each cholesteric liquid crystal film was 7.7% by weight, 6.2% by weight and 5.5% by weight relative to the content of the curable nematic liquid crystal compound, respectively, and 5% by weight of the photoinitiator (IG184, Ciba). -Geigy) and 0.2% by weight of leveling agent (BYK361, BYK) were added as additives. Each of the prepared solutions was roll coated on a polyethylene terephthalate film coated with a horizontal alignment layer, and then the solvent was dried in the dryer to orient the liquid crystal, and then UV light irradiation was used to prepare cholesteric liquid crystal films, respectively. Drying conditions were 85 ℃, UV light irradiation used a 300W (center wavelength 360nm) lamp. The center wavelengths of the selective reflection regions of the respective cholesteric liquid crystal films obtained were 470 nm, 535 nm, and 600 nm, respectively. The prepared cholesteric liquid crystal films were pressure-bonded using an adhesive in the order of the central wavelength from the short wavelength to the long wavelength. The adhesive was in the form of a solution, as in the case of coating the liquid crystal material, after the thin film coating by a roll coating method, the solvent was dried and pressed in a dryer. After pressing, it was aged for a certain time and completely bonded. The thickness of the prepared cholesteric liquid crystal film was about 13 microns.

3 is a selective reflection area spectrum of the laminated cholesteric liquid crystal film produced. Referring to FIG. 3, the laminated cholesteric liquid crystal film obtained by stacking cholesteric liquid crystal films formed of the curable nematic liquid crystal compound of Formula 1 and the curable chiral compound of Formula 2 has a wide range of selective reflection regions, thus allowing three liquid crystal films. It can be seen that only the lamination covers the visible light region.

Preparation Example 2

Three cholesteric liquid crystal films each having a different selective reflection wavelength range were prepared. Curable nematic liquid crystal compound (BASF Corporation LC1057) and curable chiral compound (BASF Corporation LC756) were dissolved in a solvent containing methyl ethyl ketone and toluene at 6: 4 at a concentration of 50% by weight, and each cholesteric liquid crystal Except for adjusting the content ratio of the curable nematic liquid crystal compound and the sex chiral compound added during film production, the center wavelengths of the selective reflection regions of the cholesteric liquid crystal films were 480 nm, 550 nm, and 630 nm, respectively. It prepared in the same manner as in Example 1.

Preparation Example 3

The cholesteric liquid crystal films were manufactured in the same manner as in Preparation Example 2, except that three cholesteric liquid crystal films were laminated in the order that the central wavelengths of the selective reflection regions of the cholesteric liquid crystal films were 630 nm, 480 nm, and 550 nm, respectively.

Fabrication of integrated broadband reflective high brightness polarizer

Example 1

A broadband reflective polarizer was prepared by pressing a lambda / 4 phase difference film (phase difference 115nm) coated with a pressure sensitive adhesive (PSA) on a short wavelength surface of the laminated cholesteric liquid crystal film prepared according to Preparation Example 2 at room temperature. .

Then, the ultraviolet curable resin liquid was coated on the retardation film attachment surface of the manufactured broadband reflective polarizing plate. The UV curable resin liquid composition is an initiator in the curable composition of bisphenol A polyphenylene diacrylate oligomer 80% by weight and 15% by weight of 2-hydroxy-3-phenoxy-propyl acrylate monomer. ) 5% by weight of the initiator "Darocure 1173".

Subsequently, the UV curable resin solution was coated to a thickness of 20 μm through the process shown in FIG. 2, and the diffusion part was fixed through the UV curing apparatus while taking a pattern to prepare an integrated broadband reflective high brightness polarizing plate. The refractive index of the prepared diffusion pattern coating film was 1.52, Ra (average height of peaks (mountains and valleys) based on the centerline of the surface curve) was 1.5, and haze was 60%.

Example 2

A broadband reflective polarizer was manufactured by compressing a λ / 4 retardation film (phase difference 135 nm) coated with a pressure sensitive adhesive (PSA) on a long wavelength surface of a laminated cholesteric liquid crystal film prepared according to Preparation Example 3 at room temperature. .

Then, the ultraviolet curable resin liquid was coated on the retardation film attachment surface of the manufactured broadband reflective polarizing plate. The UV curable resin liquid composition is a Merck initiator as an initiator in a curable composition of 70% by weight of dibromo bisphenol A polyethoxylate diacrylate oligomer and 25% by weight of bisphenol A diethylene diacrylate monomer. 5% by weight of "Darocure 1173".

Subsequently, the UV curable resin solution was coated to a thickness of 20 μm through the process shown in FIG. 2, and the diffusion part was fixed through the UV curing apparatus while taking a pattern to prepare an integrated broadband reflective high brightness polarizing plate. The refractive index of the prepared diffusion pattern coating film was 1.52 or more, and the haze was 60%.

As a result of measuring the brightness by mounting the integrated broadband reflective high brightness polarizing plate having the diffusion pattern of the present invention manufactured according to Examples 1 and 2 on the LCD panel, it is confirmed that the luminance loss is significantly reduced compared to the LCD panel using the conventional diffusion film. Could.

The integrated broadband reflective high brightness polarizing plate having the diffusion pattern of the present invention manufactured as described above not only significantly reduces the luminance loss, but also the diffusion pattern coating film formed on one surface of the polarizing plate is integrated with the polarizing plate. Loss can be prevented.

In particular, when the laminated cholesteric liquid crystal films constituting the polarizing plate are formed by using the specific curable nematic liquid crystal compound and the curable chiral compound described above, the width of the selective reflection wavelength region becomes very wide so that only several liquid crystal films are laminated. Even if all the visible light region is covered. Accordingly, the thickness of the manufactured polarizing plate can be reduced, thereby maximizing luminance improvement characteristics.

In addition, it is economical because the manufacturing process of the liquid crystal display device is shortened and the defect rate is reduced.

Claims (12)

(a) a broadband reflective polarizing plate comprising the following (i) and (ii); And (i) A plurality of cholesteric liquid crystal films formed to have different selective reflection wavelength regions by varying the mixing ratio of the curable nematic liquid crystal compound represented by the following Chemical Formula 1 and the curable chiral compound represented by the following Chemical Formula 2 Laminated cholesteric liquid crystal film and (ii) lambda / 4 phase difference film laminated on one surface of the laminated cholesteric liquid crystal film, (b) An integrated broadband reflective high brightness polarizing plate having a diffusion pattern, comprising a diffusion pattern coating film formed on a surface of the λ / 4 retardation film. <Formula 1>

In Formula 1, S is a spacer

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In Formula 2, S is a spacer

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Any one selected from the group consisting of. delete The cholesteric liquid crystal film of claim 1, wherein the cholesteric liquid crystal film is formed by laminating three cholesteric liquid crystal films each having a center wavelength of 450 to 480 nm, 530 to 550 nm, and 590 to 630 nm, respectively. Integrated broadband reflective high brightness polarizer with diffusion pattern. 4. The integrated broadband with diffusion pattern according to claim 3, wherein the laminated cholesteric liquid crystal film is formed by stacking three cholesteric liquid crystal films having a center wavelength of 480 nm, 550 nm and 630 nm, respectively, in a selective reflection wavelength region. Reflective high brightness polarizer. The integrated broadband reflective high brightness polarizer of claim 1, wherein the diffusion pattern coating layer has a refractive index of 1.46 or more. The integrated broadband reflective high brightness polarizer of claim 1, wherein the haze of the diffusion pattern coating layer is 40 to 95%. (S1) preparing a plurality of cholesteric liquid crystal films formed by varying the mixing ratio of the curable nematic liquid crystal compound represented by the following formula (1) and the curable chiral compound represented by the following formula (2) each having a different selective reflection wavelength range Making; (S2) stacking the plurality of cholesteric liquid crystal films to produce a laminated cholesteric liquid crystal film having a broadband selective reflection wavelength region; (S3) manufacturing a broadband reflective polarizer by laminating the λ / 4 retardation film on one surface of the laminated cholesteric liquid crystal film; (S4) coating a photocurable resin liquid on the surface of the λ / 4 retardation film; And (S5) an integrated broadband reflective high brightness polarizer having a diffusion pattern, comprising: forming a diffusion pattern coating layer by irradiating light while passing the surface coated with the photocurable resin liquid through a roll on which the diffusion pattern is etched; Manufacturing method. <Formula 1>

In Formula 1, S is a spacer

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In Formula 2, S is a spacer

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Any one selected from the group consisting of. delete The cholesteric liquid crystal film of claim 7, wherein the laminated cholesteric liquid crystal film is prepared by laminating three cholesteric liquid crystal films in which the center wavelengths of the selective reflection wavelength range are respectively 450 to 480 nm, 530 to 550 nm, and 590 to 630 nm. A method of manufacturing an integrated broadband reflective high brightness polarizing plate having a diffusion pattern, characterized in that. 10. The diffusion pattern of claim 9, wherein the laminated cholesteric liquid crystal film is manufactured by stacking three cholesteric liquid crystal films in which the center wavelengths of the selective reflection wavelength ranges are respectively 480 nm, 550 nm, and 630 nm. Method of manufacturing an integrated broadband reflective high brightness polarizer having a. The method of claim 7, wherein the photocurable resin liquid has a coating thickness of 15 to 25 μm. A liquid crystal display device comprising the integrated broadband reflective high brightness polarizing plate of any one of claims 1 and 3.

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