KR20050103687A - Brightness enhancement film for liquid crystal display and manufacturing method thereof - Google Patents

Abstract

The method for manufacturing a brightness enhancement film for a liquid crystal display according to the present invention comprises the steps of applying a liquid crystal consisting of a plurality of encapsulated liquid crystal molecules on a polymer film, the step of orienting the plurality of encapsulated liquid crystal molecules in either direction to form a liquid crystal film And encapsulated liquid crystal molecules are microcrystalline structures. Therefore, the manufacturing method of the brightness enhancement film for liquid crystal display devices which concerns on this invention is formed so that it may have reflective polarization property only by a single layer or several layers, and simplifies the manufacturing process of a brightness enhancement film.

Description

A brightness enhancement film for liquid crystal display devices and a manufacturing method therefor {BRIGHTNESS ENHANCEMENT FILM FOR LIQUID CRYSTAL DISPLAY AND MANUFACTURING METHOD THEREOF}

The present invention relates to a brightness enhancement film for a liquid crystal display device and a method of manufacturing the same.

The liquid crystal display is one of the most widely used flat panel display devices. The liquid crystal display includes two display panels on which a field generating electrode is formed and a liquid crystal layer interposed therebetween. It is a display device which controls the transmittance | permeability of the light which passes through a liquid crystal layer by rearranging.

Such a liquid crystal display includes a backlight unit for generating light, an optical film unit for uniforming the luminance of light generated in the backlight, and a display unit for displaying an image using uniform light.

Among these, the optical film portion includes a diffusion film, a prism film, a brightness enhancement film, and the like, and the brightness enhancement film has a thick thickness of 140 to 440 μm because several hundred or more layers are laminated, and the manufacturing process is complicated.

In addition, the diffusion film, the prism film, and the brightness enhancement film of the optical film portion are each formed separately and are disposed at a predetermined interval from each other.

However, as the size of the liquid crystal display increases, the degree of expansion of the diffusion film, the prism film, and the brightness enhancement film of different materials are different from each other due to temperature and humidity. Easy to occur And display defects, such as an unevenness, generate | occur | produce by the wrinkle of this optical film part.

SUMMARY OF THE INVENTION An object of the present invention is to provide a brightness enhancement film for a liquid crystal display device and a method for manufacturing the same, which shorten a manufacturing process and reduce generation of hum.

Method for manufacturing a brightness enhancement film for a liquid crystal display device according to the present invention comprises the steps of applying a liquid crystal consisting of a plurality of encapsulated liquid crystal molecules on a polymer film, or by aligning the plurality of encapsulated liquid crystal molecules in either direction to form a liquid crystal film Preferably, the encapsulated liquid crystal molecules have a microcrystalline structure.

In addition, the encapsulated liquid crystal molecules preferably have a size of several tens nm or more and several hundred nm or less.

In addition, the method for producing a liquid crystal consisting of the encapsulated liquid crystal molecules is a step of adding and stirring deionized water, a surfactant in the interior of the reactor, a step of introducing a styrene monomer and nematic or smetic liquid crystal in the reactor, the reactor It is preferable to include the step of introducing an initiator therein.

In addition, the liquid crystal composed of the encapsulated liquid crystal molecules is preferably in the colloidal state.

In addition, the plurality of encapsulated liquid crystal molecules are preferably oriented in either direction by rubbing or applying an electric field.

In addition, the polymer film is a polycarbonate, polyethylene terephthalate, polysulfone, polymethyl methacrylate, polystyrene, polyvinyl chloride, polyvinyl alcohol, polynorbornene, copolymers thereof or these It is preferably any one selected from the derivative films of the liver.

In addition, it is preferable that the polymer film and the liquid crystal film further comprises the step of thermal stretching treatment in either direction.

In addition, the thermal stretching temperature of the polymer film is preferably a glass transition temperature to a glass transition temperature + 100 degrees of the polymer film.

In addition, the length of the thermally stretched polymer film and the liquid crystal film is preferably 1.1 to 8 times larger than the length before the heat stretching.

The brightness enhancement film for a liquid crystal display device according to the present invention comprises a polymer film and a liquid crystal film formed on the polymer film, wherein the plurality of encapsulated liquid crystal molecules of the liquid crystal film has a microcrystalline structure, and is oriented in either direction. Do.

In addition, the polymer film and the encapsulated liquid crystal film are preferably heat-stretched in either direction.

In addition, the polymer film is a polycarbonate, polyethylene terephthalate, polysulfone, polymethyl methacrylate, polystyrene, polyvinyl chloride, polyvinyl alcohol, polynorbornene, copolymers thereof or these It is preferably any one selected from the derivative films of the liver.

In addition, the encapsulated liquid crystal molecules preferably have a size of several tens nm or more and several hundred nm or less.

In addition, the method of manufacturing a liquid crystal display device according to the present invention includes the steps of dropping a first ultraviolet crosslinking agent on the diffusion film, uniformly applying the first ultraviolet crosslinking agent on the diffusion film, brightness enhancement film on the first ultraviolet crosslinking agent Positioning a second ultraviolet crosslinking agent on the brightness enhancing film, uniformly applying the second ultraviolet crosslinking agent on the brightness enhancing film, placing a prism film on the second ultraviolet crosslinking agent, and And irradiating ultraviolet rays to the first and second ultraviolet crosslinking agents, wherein the luminance-enhancing film is preferably a liquid crystal film in which a plurality of encapsulated liquid crystal molecules are oriented in either direction.

In addition, it is preferable that the first and second ultraviolet crosslinking agents are uniformly coated on the diffusion film and the brightness enhancement film, respectively, by using a spin coating method or a blading method.

In addition, the brightness enhancement film is preferably one or more.

In addition, the liquid crystal display according to the present invention is located between the display unit for displaying an image, the backlight unit for supplying light to the display unit, the display unit and the backlight unit, and comprises a diffusion film, a prism film and at least one brightness enhancement film An optical film portion, wherein the brightness enhancement film is formed on a polymer film, the polymer film, it is preferable to include a liquid crystal film in which a plurality of encapsulated liquid crystal molecules of a microcrystalline structure is oriented in either direction.

In addition, it is preferable that a brightness enhancement film is formed on the diffusion film, and a prism film is formed on the brightness enhancement film.

In addition, the diffusion film and the brightness enhancement film are preferably attached by a first ultraviolet crosslinking agent, and the brightness enhancement film and the prism film are preferably attached by a second ultraviolet crosslinking agent.

Then, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

Now, a brightness enhancing film for a liquid crystal display according to an exemplary embodiment of the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a liquid crystal display including a brightness enhancement film for a liquid crystal display according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the liquid crystal display device 100 including the brightness enhancement film for a liquid crystal display device according to an exemplary embodiment of the present invention may be disposed below the display unit 130 and the display unit 130 for displaying an image. The optical film unit positioned between the backlight unit 145, the display unit 130, and the backlight unit 150 positioned to supply light to the display unit 130 and equalizes the luminance of light generated by the backlight unit 150 ( 140). In addition, the display unit 130 may include a thin film transistor (TFT) display panel 131, a color filter display panel 132 facing the thin film transistor array panel 131, and a liquid crystal layer injected between the display panels 131 and 132. It consists of 135. Lower and upper polarizers 133 and 134 are disposed outside the thin film transistor array panel 131 and the color filter panel 132, respectively.

The thin film transistor array panel 131 includes a plurality of pixel electrodes (not shown) arranged in a matrix form, a plurality of thin film transistors (not shown) for selectively transmitting signals to the pixel electrodes, and a plurality of thin film transistors connected to the thin film transistors. A gate line (not shown) and a plurality of data lines (not shown) are provided.

The color filter display panel 132 includes a common electrode for generating an electric field together with the pixel electrode, and a color filter for displaying color. When a voltage is applied to the pixel electrode and the common electrode, an electric field is formed to change the arrangement of liquid crystal molecules positioned therebetween.

The backlight unit 150 includes a plurality of lamps 151 for generating light and a light guide plate 152 for guiding light from the lamps 151 to the display unit 130. The lamp 151 illustrated in FIG. 1 is a direct type in which the lamp 151 is disposed under the display unit 130 and the light guide plate 150. The light guide plate 150 is positioned under the display unit 130 and has a size corresponding to the display unit 130. As shown in FIG. 1, the light guide plate 150 may have a uniform thickness, and the thickness may increase or decrease gradually.

An optical film unit 140 is disposed on the upper part of the light guide plate 150 to uniform the luminance of the light directed toward the display unit 130, and the light reflected from the light guide plate 150 is again disposed below the backlight unit 130. The reflective plate 160 is disposed to reflect toward 150 to improve light efficiency.

The optical film unit 140 is composed of a plurality of optical films. That is, the optical film unit 140 diffuses the light generated from the backlight unit 150 to diffuse the film (diffusion film) 141 to uniform the luminance distribution, the P wave of the light source is transmitted and the S wave is recycled (recycled) A brightness enhancement film 142 for improving brightness and a prism film 143 for collecting light having a uniform brightness distribution.

The brightness enhancement film 142 is formed on the diffusion film 141, and the prism film 143 is formed on the brightness enhancement film 142.

The diffusion film 141 and the brightness enhancement film 142 are attached by the first ultraviolet crosslinking agent 146, and the brightness enhancement film 142 and the prism film 143 are attached by the second ultraviolet crosslinking agent 147. Thus, the optical film portion 140 is integrally formed.

As such, the diffusion film 141, the brightness enhancement film 142, and the prism film 143 are integrally formed so that the diffusion film 141, the brightness enhancement film 142, and the degree of expansion due to temperature and humidity are different from each other. It is possible to prevent the generation of space between the prism films 143.

5 is a perspective view of the brightness enhancement film 142.

As shown in FIGS. 1 and 5, the brightness enhancement film 142 includes a polymer film 144 and a liquid crystal film 345 formed on the polymer film 144. It is preferable that the brightness enhancement film 142 is one or more.

The polymer film 144 may be polycarbonate, polyethylene terephthalate, polysulfone, polymethylmethacrylate, polystyrene, polyvinyl chloride, polyvinyl alcohol, polynorbornene, copolymers thereof, or these It is preferably any one selected from the derivative films of the liver.

The liquid crystal film 345 has a plurality of encapsulated liquid crystal molecules 9, and the encapsulated liquid crystal molecules 9 have a microcrystalline structure. That is, as shown in FIG. 2, the polymer particles 4 surround the periphery of each liquid crystal molecule 8 to form microcrystals. The liquid crystal molecules in which the polymer particles 4 surround the periphery of each liquid crystal molecule 8 are called encapsulated liquid crystal molecules. The hydrophilic portion of the polymer particles 4 faces the outside and the hydrophobic portion of the polymer particles 4 faces the respective liquid crystal molecules in a state facing the inside. The plurality of encapsulated liquid crystal molecules 9 are all aligned in parallel in either direction.

Such encapsulated liquid crystal molecules 9 preferably have a size of several tens nm or more and several hundred nm or less.

The liquid crystal film 345 in which the encapsulated liquid crystal molecules 9 having the microcrystalline structure are all oriented in parallel in one direction has P-waves and S-waves reflected by the optical anisotropy of the liquid crystal molecules 9 to reflect the polarized light. Has

That is, as shown in FIG. 1, the light generated from the backlight unit 150 includes P waves and S waves, and P waves pass and S waves are reflected by the brightness enhancement film 142 having reflective polarization characteristics. Only the wave is fed to the display.

Accordingly, the luminance-enhancing film 142 transmits P waves and reflects S waves with respect to light having a wavelength of 250 to 800 nm. In addition, the S-waves reflected by the luminance-enhancing film 142 are reflected back by the reflecting plate 160 to become P 'waves and S' waves, the double P 'waves are transmitted, and the S' waves are reflected by the luminance-enhancing film 142. And is reflected back by the reflecting plate 160. By repeating the above process, the amount of P waves passing through the liquid crystal film 345 is increased, thereby increasing the luminance.

And, by forming a plurality of brightness enhancement film 142 having such a liquid crystal film 345, the reflection polarization characteristics can be further improved.

And the reflective polarization characteristic of the brightness enhancement film 142 can be further improved by heat-stretching the brightness enhancement film 142 in either direction. That is, the long-axis direction of the liquid crystal molecules 9 is arranged long in the stretched direction so that a difference in refractive index occurs between the stretched direction and the unstretched direction, thereby further improving the reflective polarization characteristic.

The length of the heat-stretched brightness enhancement film 142 is preferably 1.1 to 8 times larger than the length before heat stretching.

Conventional brightness enhancement film 142 has a thick thickness of 140 to 440μm because more than a hundred layers of films are stacked, the manufacturing process is complicated, but the brightness enhancement film 142 as one embodiment of the present invention is a single layer or Since only a few layers have reflective polarization characteristics, the thickness of the brightness enhancement film 142 becomes thin, and the manufacturing process is simplified.

A method of manufacturing the brightness enhancement film for a liquid crystal display device according to the present invention configured as described above will be described with reference to FIGS. 3 to 6.

First, as shown in FIG. 3, a liquid crystal in which a plurality of liquid crystal molecules are encapsulated is manufactured using the reactor 40. The method for producing the liquid crystal in which the liquid crystal molecules are encapsulated is described in detail below.

0.3 g of sodium styrene sulfonate, which is about 450 g of deionized water (DI water), an emulsifier, or an emulsifier, is introduced into the reactor 40.

And, while maintaining the temperature inside the reactor 40 to 80 degrees by rotating the stirrer 41 in the reactor 40 to 350rpm or more for about 10 minutes to agitate the material in the reactor 40. That is, two or more materials having different physical or chemical properties are made into a uniform mixed state by using external mechanical energy.

Next, 50 g of styrene monomer and 50 g of nematic or smectic liquid crystals are introduced into the reactor 40. After 1 hour, 0.25 g of potassium persulfate was added to the reactor 40 as an initiator, and polymerization was performed for 3 hours under a nitrogen atmosphere to encapsulate liquid crystal molecules. 50) is prepared. The liquid crystal 50 made of such encapsulated liquid crystal molecules is in a colloidal state.

In this case, as shown in FIG. 2, the polymer particles 4 of the styrene monomer surround the periphery of each liquid crystal molecule to form microcrystals (Micell).

It is preferable that the encapsulated liquid crystal molecules of the present invention have a size of several tens nm or more and several hundred nm or less.

Next, as shown in FIG. 4, the liquid crystal having the encapsulated liquid crystal molecules prepared above is coated on the polymer film 144 to form a liquid crystal film 345. In this case, the orientation direction of each encapsulated liquid crystal molecule 9 is in several directions.

The polymer film 144 may be polycarbonate, polyethylene terephthalate, polysulfone, polymethylmethacrylate, polystyrene, polyvinyl chloride, polyvinyl alcohol, polynorbornene, copolymers thereof, or these It is preferably any one selected from the derivative films of the liver.

Next, as shown in FIG. 5, the orientation directions of the respective encapsulated liquid crystal molecules 9 are all in one direction by rubbing the liquid crystal film 345 coated on the polymer film 144 or applying an electric field. To match.

As described above, the reflective polarization characteristic is realized by the liquid crystal film 345 made of the liquid crystal molecules 9 oriented in either direction. That is, the reflective polarization characteristic is realized by using the optical anisotropy of the plurality of encapsulated liquid crystal molecules 9.

That is, as shown in FIG. 1, the light generated from the backlight unit 150 includes P waves and S waves, and P waves pass and S waves are reflected by the brightness enhancement film 142 having reflective polarization characteristics. Only the wave is fed to the display.

Accordingly, the luminance-enhancing film 142 transmits P waves and reflects S waves with respect to light having a wavelength of 250 to 800 nm. In addition, the S-waves reflected by the luminance-enhancing film 142 are reflected back by the reflecting plate 160 to become P 'waves and S' waves, the double P 'waves are transmitted, and the S' waves are reflected by the luminance-enhancing film 142. And is reflected back by the reflecting plate 160. By repeating the above process, the amount of P waves passing through the liquid crystal film 345 is increased, thereby increasing the luminance.

In addition, a plurality of brightness enhancement films 142 may be formed by repeating the above process.

Next, as illustrated in FIG. 6, the luminance enhancement film 142 including the polymer film 144 and the liquid crystal film 345 is thermally stretched in one direction, that is, in the X direction.

The heat drawing temperature is preferably from the glass transition temperature (Tg) to the glass transition temperature + 100 degrees of the polymer film 144, the heat-stretched brightness enhancement film 142 is 1.1 times the length before the heat drawing It is preferred to be 8 times larger.

Here, the glass transition temperature of the polymer film 144 refers to the temperature at which brown motion of the particles of the polymer film 144 is most free. The polymer film 144 is thermally stretched while passing through the glass transition temperature of the polymer film 144. It becomes the state that is easy to do it. For example, the glass transition temperature of a polyethylene terephthalate film (PET) is about 75 degrees.

In this manner, the thermal stretching process is performed to increase the size of the lattice of the liquid crystal film 345 in the X direction so that the polarization is better. That is, the long-axis direction of the liquid crystal molecules 9 is arranged long in the stretched direction so that a difference in refractive index occurs between the stretched direction and the unstretched direction, thereby further improving the reflective polarization characteristic. P-waves are transmitted and S-waves are reflected to improve the reflective polarization characteristics, which are again recovered by the reflector 160, thereby increasing the amount of P-waves passing through the liquid crystal film 345 to increase the brightness.

A method of manufacturing a liquid crystal display device including the brightness enhancement film 142 for the liquid crystal display device of the present invention configured as described above will be described with reference to FIGS. 7 to 10.

First, as shown in FIG. 7, the first ultraviolet crosslinking agent 146 in the form of a solution is dropped on the diffusion film 141.

Next, as shown in FIGS. 8A and 8B, the first ultraviolet crosslinking agent 146 is uniformly coated on the diffusion film 141.

That is, as shown in FIG. 8A, the diffusion film 141 is rotated by spin coating to uniformly apply the first ultraviolet crosslinking agent 146 to the diffusion film 141 to a predetermined thickness, or FIG. 8B. As shown in FIG. 1, the diffusion film 141 is rotated by a blading method to uniformly apply the first ultraviolet crosslinking agent 146 to the diffusion film 141 to a predetermined thickness using the roller 55.

Next, as shown in FIGS. 9A and 9B, the brightness enhancement film 142 is positioned on the first ultraviolet crosslinking agent 146. The brightness enhancement film 142 is made of a polymer film 144 and a liquid crystal film 345 formed on the polymer film 144, preferably at least one. The plurality of encapsulated liquid crystal molecules 9 of the liquid crystal film 345 are all aligned in parallel in either direction.

By the optical anisotropy of the liquid crystal molecules 9 oriented parallel to either direction, the liquid crystal film 345 has a reflective polarization characteristic. Therefore, the brightness enhancement film 142 transmits P waves and reflects S waves. In addition, the S-waves reflected by the luminance-enhancing film 142 are reflected back by the reflecting plate 160 to become P 'waves and S' waves, the double P 'waves are transmitted, and the S' waves are reflected by the luminance-enhancing film 142. And is reflected back by the reflecting plate 160. By repeating the above process, the amount of P waves passing through the liquid crystal film 345 is increased, thereby increasing the luminance.

Then, the second ultraviolet crosslinking agent 147 in the form of a solution is added dropwise onto the brightness enhancement film 142. Then, the second ultraviolet crosslinking agent 147 is uniformly coated on the diffusion film 141.

That is, as shown in FIG. 9A, the diffusion film 141 is rotated by spin coating to uniformly apply the second ultraviolet crosslinking agent 147 to the diffusion film 141 to a predetermined thickness, or FIG. 9B. As shown in FIG. 2, the diffusion film 141 is rotated by a blading method to uniformly apply the second ultraviolet crosslinking agent 147 to the diffusion film 141 to a predetermined thickness using the roller 55.

Next, as shown in FIG. 10, the prism film 143 is positioned on the second ultraviolet crosslinking agent 147. The first and second ultraviolet crosslinkers 146 and 147 are irradiated with ultraviolet rays (Ultra Violet, UV) to attach the diffusion film 141 and the brightness enhancing film 142 to each other with the first ultraviolet crosslinker 146. The brightness enhancing film 142 and the prism film 143 are attached to each other with the second ultraviolet crosslinking agent 147.

As described above, the diffusion film 141, the brightness enhancement film 142, and the prism film 143 of the optical film unit 140 of the liquid crystal display device are integrally formed to form the diffusion film 141, the brightness enhancement film 142, and the like. It is possible to prevent the generation of space between the prism films 143.

In the above, the first and second ultraviolet crosslinkers 146 and 147 are irradiated with ultraviolet rays at the same time so that the diffusion film 141 and the brightness enhancement film 142 and the brightness enhancement film 142 and the prism film 143 are simultaneously attached. After irradiating ultraviolet rays to the first ultraviolet crosslinking agent 146 to attach the diffusion film 141 and the brightness enhancement film 142 to each other, the second ultraviolet crosslinking agent 147 is applied and the prism film 143 is applied thereon. After positioning, the second ultraviolet crosslinking agent 147 may be irradiated with ultraviolet rays to attach the brightness enhancing film 142 and the prism film 143 to each other.

On the other hand, in the above, the step of dropping the first ultraviolet crosslinking agent 146, the step of uniformly applying the first ultraviolet crosslinking agent 146 in order to manufacture the optical film portion 140 integrally, on the first ultraviolet crosslinking agent 146 Positioning the brightness enhancing film 142, dropping the second ultraviolet crosslinking agent 147 on the brightness enhancing film 142, applying the second ultraviolet crosslinking agent 147 uniformly, and the second ultraviolet crosslinking agent 147 While placing the prism film 143 thereon and irradiating the ultraviolet rays to the first and second ultraviolet crosslinkers 146 and 147 in separate facilities, the manufacturing process was performed in various parts on the long roll. It is also possible to manufacture an integrated optical film part by a continuous process of a roll to roll (Roll to Roll) method to proceed at the same time.

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

Unlike the conventional brightness enhancement film, a brightness enhancement film for a liquid crystal display and a method of manufacturing the same according to the present invention are composed of a liquid crystal film in which a plurality of encapsulated liquid crystal molecules are oriented in one direction, thereby reflecting polarized light with only a single layer or several layers. Formed to have characteristics to simplify the manufacturing process of the brightness enhancement film to reduce the cost.

In addition, by forming the diffusion film, the brightness enhancement film and the prism film integrally, it is possible to prevent the generation of the gap between the diffusion film, the brightness enhancement film and the prism film having different degrees of expansion by temperature and humidity.

1 is a cross-sectional view of a liquid crystal display including a brightness enhancement film for a liquid crystal display according to an embodiment of the present invention;

2 is a view showing liquid crystal molecules of a microcrystalline structure,

3 is a diagram of a reactor for producing encapsulated liquid crystals,

4 to 6 are views sequentially showing a method for manufacturing a brightness enhancement film for a liquid crystal display according to an embodiment of the present invention,

7 to 10 are diagrams sequentially illustrating a method of manufacturing a liquid crystal display device including a brightness enhancement film for a liquid crystal display device according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

8 liquid crystal molecule 9 encapsulated liquid crystal molecule

141: diffusion film 142: brightness enhancement film

143: prism film 144: polymer film

345: polymer resin film 146: first ultraviolet crosslinking agent

147: second ultraviolet crosslinking agent

Claims (19)

Applying a liquid crystal composed of a plurality of encapsulated liquid crystal molecules on a polymer film, Orienting the plurality of encapsulated liquid crystal molecules in either direction to form a liquid crystal film Including, The encapsulated liquid crystal molecules have a microcrystal structure, and the method for producing a brightness enhancement film for a liquid crystal display device. In claim 1, The encapsulated liquid crystal molecules have a size of several tens of nm or more and several hundreds of nm or less. In claim 1, Method for producing a liquid crystal consisting of the encapsulated liquid crystal molecules Adding and stirring deionized water and a surfactant into the reactor, Injecting a styrene monomer and nematic or smetic liquid crystal into the reactor, Injecting an initiator into the reactor The manufacturing method of the brightness enhancement film for liquid crystal display devices containing these. In claim 1, The liquid crystal consisting of the encapsulated liquid crystal molecules is a colloidal state, the manufacturing method of the brightness enhancement film for a liquid crystal display device. In claim 1, And the plurality of encapsulated liquid crystal molecules are oriented in parallel in either direction by rubbing or applying an electric field. In claim 1, The polymer film may be polycarbonate, polyethylene terephthalate, polysulfone, polymethylmethacrylate, polystyrene, polyvinyl chloride, polyvinyl alcohol, polynorbornene, copolymers thereof, or derivatives thereof. The manufacturing method of the brightness enhancement film for liquid crystal display devices which is any one selected from the film. In claim 1, The method of manufacturing a brightness enhancement film for a liquid crystal display device further comprising the step of thermal stretching the polymer film and the liquid crystal film in either direction. In claim 7, The thermal stretching temperature of the polymer film is a glass transition temperature to a glass transition temperature of the polymer film + 100 degrees manufacturing method of a brightness enhancement film for a liquid crystal display device. In claim 7, And a length of the thermally stretched polymer film and a liquid crystal film is 1.1 to 8 times greater than the length before the thermal stretching. Polymer film, Liquid crystal film formed on the polymer film Including, A plurality of encapsulated liquid crystal molecules of the liquid crystal film is a microcrystalline structure, the brightness enhancement film for a liquid crystal display device which is aligned in parallel in either direction. In claim 10, And the polymer film and the encapsulated liquid crystal film are heat-stretched in either direction. In claim 10, The polymer film may be polycarbonate, polyethylene terephthalate, polysulfone, polymethylmethacrylate, polystyrene, polyvinyl chloride, polyvinyl alcohol, polynorbornene, copolymers thereof, or derivatives thereof. The brightness enhancement film for liquid crystal display devices which is any one selected from the film. In claim 10, The encapsulated liquid crystal molecules have a size of several tens of nm or more and several hundred nm or less. Dropping a first ultraviolet crosslinking agent on the diffusion film, Uniformly applying the first ultraviolet crosslinking agent onto the diffusion film, Positioning a brightness enhancing film on the first ultraviolet crosslinker; Dropping a second ultraviolet crosslinking agent on the brightness enhancing film; Uniformly applying the second ultraviolet crosslinking agent onto the brightness enhancing film, Positioning a prism film on the second ultraviolet crosslinker, Irradiating ultraviolet rays to the first and second ultraviolet crosslinkers. Including, The brightness enhancement film is a method of manufacturing a liquid crystal display device wherein a liquid crystal film in which a plurality of encapsulated liquid crystal molecules are oriented in either direction on a polymer film. The method of claim 14, The first and second ultraviolet crosslinking agent is uniformly coated on the diffusion film and the brightness enhancement film, respectively, by spin coating or blading. The method of claim 14, The brightness enhancement film is at least one manufacturing method of the liquid crystal display device. A display unit for displaying an image, A backlight unit for supplying light to the display unit; An optical film unit positioned between the display unit and the backlight unit, the optical film unit including a diffusion film, a prism film, and one or more brightness enhancement films Including, The brightness enhancement film Polymer film, A liquid crystal display device comprising: a liquid crystal film formed on the polymer film, wherein a plurality of encapsulated liquid crystal molecules having a microcrystalline structure are aligned in parallel in one direction. The method of claim 17, A brightness enhancement film is formed on said diffusion film, and a prism film is formed on said brightness enhancement film. The method of claim 18, And the diffusion film and the brightness enhancement film are attached by a first ultraviolet crosslinking agent, and the brightness enhancement film and the prism film are attached by a second ultraviolet crosslinking agent.