KR101028090B1 - Antistatic coating composition and optical sheet coated with the same - Google Patents

Abstract

The present invention relates to an antistatic coating composition and an optical sheet coated with an antistatic coating composition. The antistatic coating composition and the optical sheet coated with the antistatic coating composition according to the present invention include a resin containing at least one of a monomer and an oligomer and a conductive polymer of 3 to 35 parts by weight based on 100 parts by weight of the resin. As a result, by preventing the generation of static electricity, it is possible to prevent static marks, adhesion of foreign matters, etc. generated on the optical sheet, thereby improving the yield in manufacturing a backlight unit.

Antistatic, Optical Sheet

Description

Antistatic coating composition and optical sheet coated with antistatic coating composition {Antistatic coating composition and optical sheet coated with the same}

The present invention relates to an antistatic coating composition and an optical sheet coated with an antistatic coating composition, and more specifically, 3 to 35 parts by weight of a conductive polymer containing 100 parts by weight of a resin and resin including at least one of a monomer and an oligomer. It relates to an antistatic coating liquid and an optical sheet coated with an antistatic coating composition.

Liquid crystals of a liquid crystal display (LCD), which is a kind of display, do not emit light by themselves and simply transmit or block light according to an applied electric signal. Therefore, in order to display information on the panel of the liquid crystal display device, a backlight unit, which is a surface light emitting device for illuminating the panel from the rear of the panel, is required.

The backlight unit has a light source for irradiating light, a light guide plate for uniformly spreading light emitted from the light source, and an optical sheet for diffusing and increasing light passing through the light guide plate to uniformly reach the panel.

An optical sheet includes a diffuser plate for scattering light to uniform light intensity, a diffuser film, and a prism sheet that focuses on light spreading to the outside to improve luminance at the front of the panel. Since the sheet is made of a plastic material, electrical insulation is high, and static electricity is generated during friction and peeling.

Therefore, when stacking the optical sheet by the static electricity generated when the surface protection film is peeled from the optical sheet, the adhesion of the air pollutants, resulting in damage to the sensitive liquid crystal display device may be degraded, the static mark Can leave a residue.

SUMMARY OF THE INVENTION An object of the present invention is to prevent static marks, adhesion of foreign matters, etc. generated on an optical sheet by preventing the generation of static electricity of the optical sheet, thereby improving the yield in manufacturing a back lingt unit. .

The antistatic coating composition according to the present invention for achieving the above object includes a resin containing at least one of monomers and oligomers and a conductive polymer of 3 to 35 parts by weight based on 100 parts by weight of the resin.

In addition, the optical sheet according to the present invention for achieving the above object is formed on the base film, the protrusion located on the base film and the bottom of the base film, the resin containing at least one of the monomer and oligomer and 100 weight of the resin It includes an antistatic adhesive layer comprising a conductive polymer of 3 to 35 parts by weight relative to the part.

According to the present invention, it is possible to prevent static electricity generation of the optical sheet, to prevent static marks, adhesion of foreign matters, etc. generated on the optical sheet, and to improve the yield when manufacturing a backlight unit.

The optical sheet may include a base film, a protrusion located on the base film, and an antistatic adhesive layer formed on the bottom surface of the base film, and the protrusion may include a prism pattern, a lenticular lens pattern, and a micro lens array (MLA). Lens Array) pattern may include any one.

Hereinafter, for convenience of description, an optical sheet having a prism pattern will be described as an example, but the present invention is not limited thereto. The optical sheet includes a lenticular lens pattern or a micro lens array (MLA) pattern described below. It is possible.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

1 is a perspective view showing an optical sheet according to an embodiment of the present invention.

Referring to the drawings, the optical sheet 100 including the prism pattern is antistatic formed on the base film 110, the prism pattern portion 120 and the base film 100 located on the base film 100 The adhesive layer 130 may be included.

The base film 110 is a plate-shaped material made of a transparent material, for example, may be made of any one selected from the group consisting of polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene, and polyepoxy, but is not limited thereto.

The base film 110 may have a thickness of about 10 μm to about 1000 μm, and more preferably about 25 μm to about 600 μm. The base film 110 is excellent in mechanical strength and thermal stability in the thickness range as described above, can be provided with appropriate flexibility, and less loss of transmitted light.

The prism pattern part 120 may be formed on the base film 110.

The prism pattern unit 120 refracts and collects light, and a plurality of three-dimensional prism patterns having a light diffusing function may be disposed in parallel with one side of the base film 110. The material constituting the prism pattern part 120 may be acrylic resin.

For example, unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, Hydroxypropyl methacrylate, hydroxy ethyl acrylate, acrylamide, metyrol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate polymer or Acrylic type, urethane type, epoxy type, melamine type, etc., such as a copolymer or a terpolymer, can be used.

The prism pattern part 120 may be made of a material having a higher refractive index than the base film 110. This is because when the refractive index of the base film 110 is higher, a part of the light incident on the rear surface of the base film 110 may be totally reflected at the surface of the prism pattern part 120 and thus may not be incident to the prism structure.

The prism pattern part 120 includes a plurality of linear prisms arranged in parallel with one another in one direction on one surface of the base film 110, and a vertical cross section of the linear prism in the axial direction is triangular.

Since the optical sheet 100 is made of a polymer material having high electrical insulation, the optical sheet 100 generates static electricity when the surface protection film is peeled to produce a friction or backlight unit.

The generated static electricity may degrade the adhesion of air pollutants during the stacking of the optical sheet 100, thereby destroying the sensitive liquid crystal display device, and may cause static residues to leave a residue.

However, this problem may be solved by forming the antistatic adhesive layer 130 on the back surface of the base film 110.

The antistatic adhesive layer 130 is formed by coating an underside of the base film 110 with an antistatic coating liquid containing a resin containing at least one of a monomer and an oligomer and a conductive polymer that is 3 to 35 parts by weight based on 100 parts by weight of the resin. Can be formed.

This antistatic coating solution will be described later with reference to FIG. 2.

FIG. 2 is a cross-sectional view taken along the line AA ′ of the optical sheet of FIG. 1.

Referring to FIG. 2, when the optical sheet 200 is usually shipped as a product, the surface protection film 240 is placed on the optical sheet 200 to protect the optical sheet 200 from external dust or scratches. Stick down. In order to manufacture the surface protection film 240, the backlight unit, static electricity may be generated in the process of peeling from the optical sheet 200.

In order to prevent this, the antistatic adhesive layer 230 may be formed on the bottom surface of the base film 210. By forming the antistatic adhesive layer 230 as described above, it is possible to prevent the generation of static electricity when the surface protection film 240 is peeled off.

Meanwhile, the thickness R of the antistatic adhesive layer 230 may be 0.1 μm to 30 μm.

When thickness R of antistatic adhesion layer 230 is smaller than 0.1 micrometer, sufficient antistatic effect cannot be acquired and the surface which is not apply | coated between widths is likely to generate | occur | produce.

On the other hand, when the thickness (R) of the antistatic adhesive layer 230 is greater than 30 μm, it is disadvantageous in terms of economical coating, and because it has a unique color of the conductive polymer included in the antistatic adhesive layer 230. It cannot be used as a film for backlight unit.

Therefore, the thickness R of the antistatic adhesive layer 230 preferably has a range of 0.1 μm to 30 μm. By having such a thickness, a sufficient antistatic effect can be obtained and the optical sheet 200 can be kept transparent.

The antistatic adhesive layer 230 may include a resin including at least one of a monomer and an oligomer and a conductive polymer having 3 to 35 parts by weight based on 100 parts by weight of the resin. The antistatic coating solution may be formed by coating the bottom surface of the base film 210, and the antistatic coating solution may further include any one of a slip agent, a wetting agent, and an antifoaming agent.

The conductive polymer included in the antistatic coating solution is polyaniline, polypyrrol, polythiophene, polyethylene dioxythiophene, quaternary ammonium compound, epoxidized amine, fatty acid ester, sulfated Waxes, Li-Amide complexes, and the like.

The above-mentioned conductive polymer for antistatic is excellent in the antistatic effect as the amount is added, but when added over a certain amount, the adhesion of the antistatic adhesive layer 630 to be coated is weakened. This will be described later with reference to FIG. 3.

The antistatic coating liquid may include a monomer and an oligomer as a thermosetting or photocurable binder.

As the thermosetting binder, a water-soluble binder or a solvent type binder can be used. Examples of such a binder include an acrylic binder, a urethane binder, a urethane-acrylic copolymer binder, an ester binder, an ether binder, an amide binder, an amide binder, Alternatively, a polymer binder that can be used with a curing agent such as a melamine curing agent or an epoxy curing agent may be used as the epoxy binder type.

As the photocurable binder, various kinds of photopolymerizable resins having monofunctional to polyfunctional groups as acrylic, urethane, urethane acrylic monomers or oligomers are possible.

Other additives include slip agents, flow agents, leveling agents, antifoaming agents, wetting agents and the like, which may be used alone or in combination.

The slip agent may be a silicone-based material, and may be a siloxane copolymer, a modified polysiloxane, or the like.

As the flow agent and the leveling agent, silicone polyether copolymers, polysiloxanes, fluorine-based surfactants and the like can be used.

Antifoaming agent is used to remove bubbles or to suppress the generation of bubbles, it may be used octyl alcohol, cyclohexanol, nonionic surfactant and the like. In addition, a wetting agent, which is a surfactant, may be added to the solid material to allow the solution to soak well and get wet.

The method for coating the antistatic coating liquid may be one or more of inline coating, roll coating, gravure coating, microgravure coating, reverse coating, bar coating, roll brush, air knife coating, curtain coating, die coating, and dipping methods. Can be used for selection.

3 is a view for explaining the relationship between the content of the antistatic agent and thus the conductivity and adhesion.

Referring to FIG. 3, A in the graph means conductivity, and B means adhesion of the antistatic adhesive layer 130. The adhesive force herein means adhesive force between the antistatic adhesive layer 130 and the surface protection film 140.

As the content of the conductive polymer increases, the surface resistance decreases, so the conductivity (A) increases. On the other hand, as the content of the conductive polymer increases, the adhesion (B) of the coated antistatic adhesive layer 130 is weak. It can be seen that.

Thus, the preferred amount of antistatic agent is the area where the two graphs, the hatched portion of FIG. 3, intersect.

Table 1 below shows the relationship between the surface resistance and the adhesive force of the antistatic adhesive layer 130 according to the amount of the antistatic agent.

Here, the conductive polymer used is a lithium-amide complex, and a monomer is a 1 to 8 functional acrylic monomer, an oligomer is a 2 to 10 functional acrylic oligomer and a 3 to 9 functional urethane oligomer. As other additives slip agents, wetting agents, antifoaming agents were added.

The surface resistance was measured by R8340A (Advantest) and measured according to ASTM D257, and the hardness was measured by KS G2630 pencil hardness tester. In addition, the adhesive force was measured at an angle of 180 degrees at a speed of 300 mm / min. At this time, if the surface resistance is 3 × 10 ¹³ Ω / sq or less, no static electricity is generated, the pencil hardness is 2H or more satisfies the reference value.

Antistatic Content
(PHR-Part per Hundred Resin) Surface resistance
(Ω / sq) Antistatic effect adhesiveness
Pencil hardness
One 10E15 × ◎ 3H 3 3 × 10E13 ○ ○ 3H 5 4 × 10E12 ○ ○ 3H 10 10E11 ○ ○ 3H 20 10E9 ○ ○ 3H 30 10E8 ○ ○ 3H 35 10E8 ○ ○ 2 ~ 3H 40 2 × 10E7 ◎ × 2H 50 25 × 10E6 ◎ × 2H

Referring to Table 1, the change in hardness according to the content of the antistatic agent is not large. However, when 35 PHR (Part per Hundred Resin) or more, the hardness of 2H also occurs because the hardness of the monomer itself into the antistatic agent is low.

On the other hand, the conductive polymer may be included in 3 to 35 parts by weight based on 100 parts by weight of the resin.

When the amount of less than 3 parts by weight based on 100 parts by weight of the resin is improved because the adhesion of the antistatic adhesive layer 130, while the surface resistance is greater than 3 × 10 ¹³ Ω / sq, It becomes difficult to achieve a sufficient antistatic effect.

Accordingly, in order to manufacture the backlight unit, static electricity may be generated when the surface protection film 140 is peeled from the optical sheet 100, and adhesion of air pollutants may be caused when the optical sheet 100 is laminated by the generated static electricity. Static marks can be left behind, leaving a residue.

On the other hand, when the amount exceeds 35 parts by weight with respect to 100 parts by weight of the resin, the electrical conductivity is improved, but the antistatic effect is excellent, but not only the color of the conductive polymer, but also the adhesive strength is weakened to the surface protective film 140 and The prevention adhesive layer 130 may be peeled off.

Therefore, as the surface protection film 140 cannot be attached to the optical sheet 100, the optical sheet 100 may not be protected from external dust or scratches.

Therefore, the antistatic agent included in the antistatic adhesive layer 130 is preferably included in 3 to 35 parts by weight based on 100 parts by weight of the resin. Within this range, the antistatic adhesive layer 130 has not only a sufficient antistatic effect, but also excellent adhesion between the surface protection sheet 140 and the antistatic adhesive layer 130.

On the other hand, when the thickness of the antistatic adhesive layer 130 to be coated is less than 0.1㎛, sufficient antistatic effect is not obtained, there is a high possibility that the surface is not applied between the width, antistatic adhesive layer 130 If the thickness is greater than 30 μm, it is disadvantageous in terms of economical coating, and because it has a unique color of the conductive polymer included in the antistatic adhesive layer 130, it cannot be used as a backlight unit film.

Therefore, the thickness of the antistatic adhesive layer 130 preferably has a range of 0.1 μm to 30 μm.

The method for coating the antistatic coating liquid may be one or more of inline coating, roll coating, gravure coating, microgravure coating, reverse coating, bar coating, roll brush, air knife coating, curtain coating, die coating, and dipping methods. Can be used for selection.

4 is a perspective view showing an optical sheet according to an embodiment of the present invention.

Referring to FIG. 4, the optical sheet 400 may include a base film 410, a prism pattern part 420, and an antistatic adhesive layer 430, and the prism pattern part 420 may include a plurality of diffusion particles ( 440). Since the base film 410, the prism pattern part 420, and the antistatic adhesive layer 430 are the same as in the above-described embodiment, detailed description thereof will be omitted.

The plurality of diffusion particles 440 serves to diffuse and transmit light incident from the light source, and in particular, the plurality of diffusion particles 440 may be beads.

The diffusion particles 440 may be organic and inorganic particles having a high light transmittance and a high light diffusion rate. For example, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate Acrylate, hydroxy ethyl acrylate, acrylamide, metyrol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate polymer or copolymer or terpolymer Olefin-based particles such as acrylic, polyethylene, polystyrene, polypropylene, etc., copolymers of acrylic and olefins, homopolymer-like particles, and multi-layered multi-component particles made by covering the layers with other monomers Organic particles of can be used.

The plurality of diffusion particles 440 may be included in an amount of 1 to 10 parts by weight with respect to the prism pattern part 420. If the content of the plurality of diffusion particles 440 to the prism pattern portion 420 is 1 part by weight or more, it is possible to prevent a problem that the light incident from the light source is difficult to diffuse by the plurality of diffusion particles 440, When the content of the plurality of diffusion particles 440 is 10 parts by weight or less with respect to the prism pattern part 420, there is an advantage that the transmittance of light incident from the light source may be reduced.

5 and 6 are views showing an optical sheet according to an embodiment of the present invention.

Referring to FIG. 5, the optical sheet 500 according to an embodiment of the present invention may include a base film 510, a prismatic pattern part 520 disposed on the base film 510, and a charge placed on a bottom surface of the base film 510. The anti-sticking layer 530 may be included, and the prism pattern part 520 may include a peak 522 and a valley 524.

Here, the base film 510 and the antistatic adhesive layer 530 are the same as the above-described embodiment, and a detailed description thereof will be omitted.

As shown in the figure, the peak 522 of the prism of the prism pattern portion 520 is the distance H between the base film 510 and the highest point of the prism pattern portion 520, and the height of the peak 522 of the prism is The prism pattern part 520 may vary randomly or periodically in the longitudinal direction.

The average height difference of the peaks 522 of the prism may be 1 to 20 μm. In addition, the height of the valley 524 may also vary randomly or periodically in the longitudinal direction of the prism pattern portion 520.

In addition, referring to FIG. 6, the peaks 622 of the prism may be formed in a meandering shape along the longitudinal direction of the prism pattern part 620. In this case, the peaks 622 of the prism pattern part 620 may be formed. The average horizontal amplitude of can be 1 to 20 μm.

In addition, the valleys 624 of the prism pattern unit 620 may be formed in a serpentine shape to the left and right, and the average horizontal amplitude of the valleys 624 of the prism pattern unit 620 may be 1 to 20 μm.

Accordingly, defects such as the acid 622 of the prism pattern portion 620 being crushed by physical contact with other sheets in contact with the upper part of the optical sheet 600 may not be easily detected visually. This may not affect the image quality of the liquid crystal display device.

7 to 10 are perspective views showing an optical sheet according to an embodiment of the present invention.

7 and 8 illustrate an optical sheet including a micro lens array (MLA) pattern, and FIGS. 9 and 10 illustrate an optical sheet including a lenticular lens pattern. Include everything.

Referring to FIG. 7, the optical sheet 700 including the micro lens array pattern may include a base film 710, a micro lens array pattern unit 720, and an antistatic adhesive layer 730.

The micro lens array pattern may serve to condense the light incident from the light source, and the protrusions of the hemispherical shape may be aligned. 8, it can be seen that the size of these hemisphere patterns of the microlens array pattern is not the same and may be irregular.

Referring to FIG. 9, the protrusion of the optical sheet 900 may be a lenticular lens pattern unit 920. A cross section of the lenticular lens pattern may be a semicircle and may be disposed in parallel with one side of the base film 910.

The lenticular lens pattern unit 920 may serve to condense the light incident from the light source. As illustrated in FIG. 10, the lenticular lens pattern unit 920 may not have the same or irregular intervals.

11 is a cross-sectional view of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 11 is an edge-light method, and the liquid crystal display device 1100 may include a liquid crystal display panel 1110 and a backlight unit 1170 for providing light to the liquid crystal display panel 1110.

The liquid crystal display panel 1110 includes two substrates disposed to face each other, a liquid crystal layer interposed between the two substrates, and a pixel region is defined by a plurality of gate lines and data lines arranged in a matrix form on the substrate.

The backlight unit 1170 may change the distribution of light provided from the light source 1120, the light guide plate 1130 provided to the liquid crystal display panel 1110, and the light provided from the light guide plate 1130. The optical sheet 1160 uniforms the luminance distribution and improves the vertical incidence and the reflective sheet 1140 reflects the light emitted to the rear of the light guide plate 1130 to the light guide plate 1130.

The light source 1120 includes a lamp 1122 disposed on a side of the light guide plate 1130, and a reflector 1124 that reflects light emitted from the lamp 1122 to the light guide plate 1130.

The optical sheet 1160 is a diffusion sheet 1166 for diffusing light incident from the light guide plate 1130 toward the liquid crystal display panel 1110 and a prism sheet 1162 for condensing the diffused light to improve vertical incidence. And a protective sheet 1164 for protecting the prism sheet 1162.

Since the prism sheet 1162 is made of a high insulating material, static electricity may be generated when the surface protection film (not shown) is peeled from the prism sheet 1162 to manufacture the backlight unit 1170.

When the prism sheet 1162 is laminated by the generated static electricity, the adhesion of air pollutants and the resulting sensitive liquid crystal display may be destroyed, resulting in a decrease in yield, and a static mark may be formed to leave a residue. have.

In order to solve this problem, an antistatic adhesive layer 1180 may be formed on the bottom of the prism sheet 1162, and the antistatic adhesive layer 1180 may include 100 weights of resin and resin including at least one of monomers and oligomers. 3 to 35 parts by weight of the conductive polymer may be included, and may be formed by various coating methods.

At this time, when the thickness of the antistatic adhesive layer 1180 formed is less than 0.1㎛, sufficient antistatic effect is not obtained, when larger than 30㎛, specific to the conductive polymer contained in the antistatic adhesive layer 1180 Because of the color of the can not be used as a film for the backlight unit 1170. Therefore, it is preferable that the thickness of the antistatic adhesion layer 1180 is 0.1 micrometer-30 micrometers.

As described above, the antistatic adhesive layer 1180 is formed on the prism sheet 1162 to prevent static electricity from generating on the prism sheet 1162, thereby adhering static marks and foreign substances generated on the prism sheet 1162. Etc., the yield can be improved when the liquid crystal display 1100 is manufactured.

Meanwhile, the technical idea of the present invention is not limited by the structure of the backlight unit 1170 provided in the above-described embodiment. That is, the above description is an edge-light method, but it is obvious that the technical idea of the present invention may be applied to a direct type backlight unit as described below.

12 is a cross-sectional view of a liquid crystal display according to an exemplary embodiment of the present invention. However, the parts shown and described in FIG. 11 will not be repeatedly described in detail.

12 illustrates a direct method, the liquid crystal display 1200 may include a liquid crystal display panel 1210 and a backlight unit 1270 for providing light to the liquid crystal display panel 1210.

Since the liquid crystal display panel 1210 is the same as that described with reference to FIG. 11, a detailed description thereof will be omitted.

The backlight unit 1270 may include a plurality of light sources 1222, a reflective sheet 1240, a lower chassis 1290 in which the light sources 1222 and the reflective sheet 1240 are accommodated, and a diffuser plate disposed on the light source 1222. 1230 and optical sheet 1260.

The light source 1222 may use a linear light source such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL). The reflective sheet 1240 reflects the light generated from the light source 1222 in the direction in which the liquid crystal display panel 1210 is positioned to improve light utilization efficiency.

The light generated by the light source 1222 is incident on the diffusion plate 1230, and the optical sheet 1260 is disposed on the diffusion plate 1230. The optical sheet 1260 includes a diffusion sheet 1266, a prism sheet 1262, and a protective sheet 1264.

In addition, the antistatic adhesive layer 1280 may be formed on the bottom surface of the prism sheet 1262 at a desired thickness of 0.1 μm to 30 μm, thereby preventing static electricity from occurring, thereby adhering static marks and foreign substances. And the like can be prevented.

While the above has been shown and described with respect to preferred embodiments of the invention, the invention is not limited to the specific embodiments described above, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

1 is a perspective view showing a prism sheet according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA ′ of the prism sheet of FIG. 1.

3 is a view for explaining the content, conductivity and adhesion of the antistatic agent.

4 is a perspective view showing a prism sheet according to an embodiment of the present invention.

5 and 6 illustrate a prism sheet according to an embodiment of the present invention.

7 to 10 is a perspective view showing a prism sheet according to an embodiment of the present invention.

11 is a cross-sectional view of a liquid crystal display according to an exemplary embodiment of the present invention.

12 is a cross-sectional view of a liquid crystal display according to an exemplary embodiment of the present invention.

Claims (21)

delete delete delete delete delete Base film; A protrusion disposed on the base film and including a prism pattern; And An antistatic adhesive layer formed on the bottom surface of the base film and including a resin including at least one of a monomer and an oligomer, and a conductive polymer having 3 to 35 parts by weight based on 100 parts by weight of the resin, The prism pattern includes a plurality of peaks and a plurality of valleys, and the peaks and the valleys have a meandering shape along the longitudinal direction of the prism pattern. The method of claim 6, The conductive polymer is an optical sheet including at least one of polyaniline, polypyrrol, polythiophene, polyethylene dioxythiophene, and lithium amide complex. The method of claim 6, The monomer is an optical sheet containing at least one of 1 to 8 functional acrylic monomers. The method of claim 6, The oligomer is an optical sheet comprising at least one of 2 to 10 functional acrylic oligomer and 3 to 9 functional urethane oligomer. The method of claim 6, The base film has a thickness of 25 to 600㎛ optical sheet. The method of claim 6, The surface resistance of the antistatic adhesive layer is 10 ⁸ Ω / sq to 3 × 10 ¹³ Ω / sq. The method of claim 6, The adhesive layer has a thickness of 0.1 μm to 30 μm. The method of claim 6, The adhesive layer is an optical sheet formed by any one of an in-line coating, roll coating, gravure coating, microgravure coating, reverse coating, bar coating, roll brush, air knife coating, curtain coating, die coating and dipping method. delete The method of claim 6, The height of the mountain is variable along the longitudinal direction of the optical sheet. The method of claim 6, The prism pattern includes a plurality of diffusion particles. The method of claim 16, The plurality of diffusion particles are beads optical sheet. The method of claim 17, The bead with respect to the prism pattern is included in the optical sheet 1 to 10 parts by weight. delete A back light unit comprising the optical sheet of any one of claims 6 to 13 and 15 to 18. A liquid crystal display comprising the optical sheet of any one of claims 6 to 13 and 15 to 18.

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