KR20100107891A - Optical sheet - Google Patents

Abstract

PURPOSE: An optical sheet is provided to be cost-effectively manufactured and improve the manufacturing efficiency by preventing the reduction of the illuminance. CONSTITUTION: A light diffusing layer including a binder resin and light diffusing particles is formed on at least one base layer(10). A light collecting layer(40) is formed on the light diffusing layer and is composed of a curable resin. The surface of the light collecting layer is structured. Resin curing layers(50, 60) are formed on the light collecting layer and contain elements including branch chains with the slip characteristic.

Description

Optical sheet

TECHNICAL FIELD The present invention relates to an optical sheet for use in a liquid crystal display (hereinafter referred to as LCD), and more particularly to an optical sheet having a structured surface.

LCD, which is used as an optical display element, is an indirect light emission method that displays an image by controlling transmittance of an external light source, and a backlight unit, which is a light source device, is used as an important component for determining the characteristics of an LCD.

In particular, with the development of LCD panel manufacturing technology, the demand for thin and high brightness LCD displays has increased, and accordingly, various attempts have been made to increase the brightness of the backlight unit, which is used for monitors, PDAs (Personal Digital Assistants), and notebook computers. In the liquid crystal display used as, a bright ray from a small energy source can be said to be a measure of excellence. Therefore, in the case of LCD, the front brightness is very important.

LCD has a structure in which light passing through the light diffusion layer is diffused in all directions, so the light emitted to the front becomes very insufficient, and thus, efforts to express higher luminance with less power consumption continue. In addition, as the display becomes larger, efforts are being made to widen the viewing angle so that more users can view it.

For this purpose, increasing the power of the backlight increases power consumption and heat loss. As a result, portable displays have a larger battery capacity and shorter battery life.

Therefore, a method of directing light to improve brightness has been proposed, and various lens sheets have been developed for this purpose. The typical optical sheet has a prism array on the surface.

In general, an optical sheet having a prism array has a triangular array structure having an inclined surface of 45 ° to improve luminance in the front direction.

As such, since the optical structure surface is in the shape of a mountain, the upper part of the mountain is easily broken or distorted due to small external scratches, thereby causing damage to the prism structure. Since the angles emitted by the same type of prism structure are the same for each array, the luminance decreases due to the difference in the light paths emitted between the damaged part and the normal part even by small crushing of the mountain or minute scratches on the inclined surface in the prism array. And failure occurs. Therefore, even in the production of the prism sheet, even in the case of minute defects may not be able to use the entire surface of the produced prism sheet. This leads to a decrease in productivity, which in turn is a burden of cost increase. In fact, even in the assembling of the backlight module, defects due to damage to the prism structure due to scratches when handling the prism sheet become a significant problem.

In addition, when mounting on the backlight unit, a plurality of sheets and films are laminated, and in order to increase the brightness, a plurality of prism films may be mounted. In this case, the upper prism film and the upper prism film may be in contact with each other. Due to this there was a problem that the prism structure is damaged.

Therefore, in order to prevent damage of such a prism structure, there existed a case where the conventional protective film was laminated | stacked. However, as LCD panels are becoming thinner, there is a tendency to omit the film or to use a sheet having a compound function, and also to increase the production cost, time and physical efficiency due to the addition of a protective film laminating process. .

In addition to the damage to the prism structure due to the handling during such manufacturing, as the use of portable displays such as laptops and PDAs increases, cases of moving the displays into bags and the like have become frequent. In this case, when a shock is applied to the display due to jumping while moving or a vehicle is stopped, even if there is a protective film, the prism structure mounted in the display is damaged and a serious problem affecting the screen is generated.

Therefore, there is an urgent need for the development of an optical sheet including an optical structure surface that can flexibly cope with the force applied from the outside.

On the other hand, the general backlight unit uses a cold cathode fluorescent lamp (CCFL) to sequentially pass light emitted by using a light source through a light diffusing member such as a light guide plate, a light diffusion sheet or a light diffusion plate, and a prism sheet. Reach the panel. Here, the light guide plate transmits the light emitted from the light source to be distributed over the entire surface of the liquid crystal panel having a flat shape, the light diffusing member obtains uniform light intensity over the entire screen, and the prism sheet passes through the light diffusing member A light path control function is performed so that the light beam in the direction is converted into a range of viewing angle θ suitable for the viewer to recognize the image. In addition, the lower portion of the light guide plate is provided with a reflective sheet for increasing the efficiency of use of the light source by being able to be reflected back to the light that is not delivered to the liquid crystal panel off the path.

In order to effectively transmit the emitted light to the liquid crystal panel, a plurality of sheets having various functions are mounted. A plurality of sheets causes the optical interference to occur, and the film is damaged due to physical contact between the sheets. There were problems such as a decrease and an increase in unit price.

In recent years, attempts have been made to reduce the application of optical sheets used to simplify the production process, in which a prism film is adhered onto a light diffusing member or a prism pattern is formed on the light diffusing member. There was. However, such a plate may be advantageous in terms of cost and productivity, but there is a problem that an increase in brightness is far below expectations.

Therefore, there is a need for a method of sufficiently increasing the luminance while minimizing the application of optical sheets to improve the luminance.

One embodiment of the present invention seeks to provide an optical sheet having a structured surface that is intact against forces or rough surfaces applied from a certain exterior when applied to a display.

It is also an embodiment of the present invention to provide an optical sheet having a structured surface that can be easily prevented from damage to the structured surface.

One embodiment of the present invention is to provide an optical sheet that can prevent a decrease in luminance due to the occurrence of optical path difference.

In addition, one embodiment of the present invention is to provide an optical sheet that can reduce the production rate while reducing the production cost and increase the production efficiency.

One embodiment of the present invention is to provide an optical sheet assembly that does not require lamination of the protective film.

One embodiment of the present invention is equivalent to that obtained by mounting conventional light diffusing members and prism sheets, while having a structured surface that is intact against forces or rough surfaces applied from a certain exterior when applied to a display. It is an object of the present invention to provide an optical sheet capable of obtaining the above luminance and reducing the number of mounting sheets.

In addition, one embodiment of the present invention is to provide a composite optical sheet having a structured surface that can be easily prevented damage to the structured surface is easy to handle.

One embodiment of the present invention is to provide a compounded optical sheet that can prevent a decrease in luminance due to the occurrence of the optical path difference.

In addition, an embodiment of the present invention is to provide a composite optical sheet that can reduce the production rate while reducing the production cost and increase the production efficiency.

In addition, one embodiment of the present invention is to provide a compounded optical sheet that can provide adequate concealment.

One embodiment of the present invention is to provide an optical sheet assembly that can reduce the number of optical sheets to be mounted, without requiring the lamination of the protective film.

In one embodiment of the present invention, in the optical sheet structured surface,

An optical sheet comprising a resin cured layer made of a curable resin containing an element having slip property in a molecular chain, and having a damage resistance load of 20 g or more, defined as follows.

Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet.

In another embodiment of the present invention; And a curable resin formed on the substrate layer, the curable resin containing an element having slip property in the molecular chain, the light collecting layer having a structured surface, and having an damage resistance load as defined above being 20 g or more. do.

In another embodiment of the present invention; A light collecting layer formed on the base layer, made of a curable resin, and having a structured surface; And a resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in the molecular chain, wherein the damage resistant load defined as above is 20 g or more.

In another embodiment of the present invention; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; An air layer formed on the light diffusion layer and including a binder resin and foam beads; And a light-condensing layer formed of a curable resin formed on the air layer, containing or not foamable beads, and containing elements having slip properties in the molecular chain, and having a structured surface, wherein the damage load defined above is 20 g or more. Provide an optical sheet.

In another embodiment of the present invention; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; And a curable resin formed on the light diffusing layer, comprising a foaming bead, containing an element having slip property in the molecular chain, and having a structured surface, wherein the damage resistance defined above is The optical sheet which is 20 g or more is provided.

In another embodiment of the present invention; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; And a curable resin formed on the light diffusion layer, the curable resin containing an element having slip property in the molecular chain, and having a structured surface, the optical sheet having a damage resistance of 20 g or more as defined above. do.

In another embodiment of the present invention; A particle dispersing layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And a light collecting layer formed of a curable resin formed on the other side of the base layer and containing elements having slip property in molecular chains and having a structured surface, wherein the damage resistance defined above is 20 g or more. do.

In another embodiment of the present invention; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin, light diffusing particles, and foam beads; And a curable resin formed on the light diffusion layer, the curable resin containing an element having slip property in the molecular chain, and having a structured light collecting layer, wherein the damage resistance defined above is 20 g or more. do.

In another embodiment of the present invention; And a curable resin formed on at least one surface of the substrate layer, the curable resin comprising foamed beads and light-diffusing particles, and containing an element having slip property in the molecular chain, and having a structured surface. Provided is an optical sheet having a damage resistance of 20 g or more defined as described above.

In another embodiment of the present invention; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; An air layer formed on the light diffusion layer and including a binder resin and foam beads; A light collecting layer formed on the air layer and made of a curable resin containing or without foamable beads and having a structured surface; And a resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in the molecular chain, wherein the damage resistant load defined as above is 20 g or more.

In another embodiment of the present invention; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; A light collecting layer formed on the light diffusing layer and made of a curable resin including foamed beads, the surface of which is structured; And a resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, wherein the damage resistant load as defined above is 20 g or more.

In another embodiment of the present invention; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; A light collecting layer formed on the light diffusing layer and having a structured surface; And a resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, wherein the damage resistant load as defined above is 20 g or more.

In another embodiment of the present invention; A particle dispersing layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; A light collecting layer formed on the other side of the base layer and having a structured surface; And a resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, wherein the damage resistant load as defined above is 20 g or more.

In another embodiment of the present invention; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin, light diffusing particles, and foam beads; A light collecting layer formed on the light diffusing layer and having a structured surface; And a resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, wherein the damage resistant load as defined above is 20 g or more.

Another embodiment of the present invention is a substrate layer; A light collecting layer formed on at least one surface of the substrate layer and made of a curable resin including foamed beads and light diffusing particles, and having a structured surface; And a resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, wherein the damage resistant load as defined above is 20 g or more.

The optical sheet according to embodiments of the present invention may have a damage load of 30 g or more.

The optical sheet according to embodiments of the present invention may have a damage resistance load of 30 g to 500 g.

In the optical sheet according to the embodiments of the present invention, the element having slip property may be F or Si.

In the optical sheet according to some embodiments of the present invention, the resin cured layer may be formed from a curable composition comprising an organosilicon compound having an ethylenically unsaturated group or a fluorine-based compound having an ethylenically unsaturated group and a photoinitiator.

In the optical sheet according to some embodiments of the present invention, the resin cured layer is at least one compound selected from urethane acrylate compounds, styrene compounds, butadiene compounds and isoprene monomers, or bisphenol acrylate compounds and fluorene At least one curable material selected from a mixture with at least one compound selected from acrylate compounds; An organosilicon compound having an ethylenically unsaturated group or a fluorine compound having an ethylenically unsaturated group; And it may be formed from a curable composition comprising a photoinitiator.

In the optical sheet according to the embodiment of the present invention, the light collecting layer is at least one compound selected from urethane acrylate compound, styrene compound, butadiene compound and isoprene monomer, or bisphenol acrylate compound and fluorene acrylate At least one curable material selected from a mixture with at least one compound selected from the group compounds; An organosilicon compound having an ethylenically unsaturated group or a fluorine compound having an ethylenically unsaturated group; And it may be formed from a curable composition comprising a photoinitiator.

In the optical sheet according to the embodiment of the present invention, the light collecting layer is at least one compound selected from urethane acrylate compound, styrene compound, butadiene compound and isoprene monomer, or bisphenol acrylate compound and fluorene acrylate At least one curable material selected from a mixture with at least one compound selected from the group compounds; And it may be formed from a curable composition comprising a photoinitiator.

In the optical sheet according to the embodiment of the present invention, the remaining surface of the substrate layer may further include a resin cured layer made of a curable resin containing an element having a slip in the molecular chain. At this time, the resin cured layer may be formed from a curable composition comprising an organosilicon compound having an ethylenically unsaturated group or a fluorine-based compound having an ethylenically unsaturated group and a photoinitiator.

In the optical sheet according to some embodiments of the present invention, the resin cured layer may be formed from a curable composition of 100 to 5,000 cps when the viscosity is 25 ° C.

In an optical sheet according to some embodiments of the invention, the light collecting layer is formed from a curable composition having a viscosity of 100 to 5,000 cps when the viscosity is 25 ° C.

In the optical sheet according to some embodiments of the present invention, the resin cured layer may be formed from a curable composition having a glass transition temperature of 40 ° C. or less.

In the optical sheet according to some embodiments of the present invention, the light collecting layer may be formed from a curable composition having a glass transition temperature of 40 ° C. or less.

In the optical sheet according to some embodiments of the present invention, the resin cured layer may be formed from a curable composition having a glass transition temperature of -15 to 25 ° C.

In the optical sheet according to some embodiments of the present invention, the light collecting layer may be formed from a curable composition having a glass transition temperature of -15 to 25 ° C.

In an optical sheet according to the embodiments of the present invention, the structured surface comprises a polyhedron shape having a polygonal, semi-circular or semi-elliptical cross section; Columnar shape having a polygonal, semi-circular or semi-elliptic cross section; And curved columnar shapes whose cross section is polygonal, semi-circular or semi-elliptic.

In the optical sheet according to the embodiments of the present invention, the structured surface may be formed from a columnar pattern having a triangular cross section having a vertex angle of 90 °.

The optical sheet according to this embodiment may prevent damage to the structured surface even when a certain load is applied from the outside when applied to the display, it may be easy to handle.

In addition, even if a separate protective film is not used, there is no damage to the structured surface, thereby simplifying the manufacturing process of the backlight unit, and reducing production costs and increasing production efficiency.

In addition, it is possible to prevent a decrease in luminance due to damage, and thus to maintain the function inherent in the optical sheet imparted at the time of manufacture.

In addition, since the film is not easily damaged by the film lamination or external impact during the manufacturing process, the defect occurrence rate is reduced, thereby reducing the production cost and increasing the production efficiency.

In addition, it is possible to provide a portable display such as a notebook or a PDA that is not easily damaged by external shocks such as running in a bag or sudden stop due to moving a vehicle.

In addition, the compounded optical sheet according to the embodiment can prevent damage to the structured surface even when a certain load is applied from the outside when applied to the display, it is easy to handle, while evenly spreading the light emitted from the light source At the same time, while providing a function to improve the brightness while providing excellent concealability.

In addition, compared to the case of separately mounting the light diffusing member and the prism sheet, not only can significantly shorten the manufacturing process but also reduce the cost, it is possible to provide a composite optical sheet that can manufacture a thinner liquid crystal display.

In addition, the present invention can provide a composite optical sheet capable of preventing the loss of light and damage to the sheet, such as optical interference phenomenon, scattering or absorption caused by laminating a plurality of sheets.

In addition, even if a separate protective film is not used, there is no damage to the structured surface, thereby simplifying the manufacturing process of the backlight unit, and reducing production costs and increasing production efficiency.

The present invention can prevent the lowering of luminance due to damage, and thus can maintain the function unique to the optical sheet imparted at the time of manufacture.

In addition, since the film is not easily damaged by the film lamination or external impact during the manufacturing process, the defect occurrence rate is reduced, thereby reducing the production cost and increasing the production efficiency.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of an optical sheet according to an embodiment of the present invention, and FIGS. 2 to 3 are cross-sectional views of an optical sheet including a resin cured layer separately.

Meanwhile, FIG. 4 is a cross-sectional view of the compounded optical sheet according to an embodiment of the present invention, and FIGS. 5 to 10 are cross-sectional views of the compounded optical sheet according to another embodiment of the present invention. In these drawings, the same reference numerals are used for the same components for convenience, but they do not necessarily mean the same things in composition and form.

The optical sheet according to the embodiment of the present invention is not particularly limited, but may be an optical sheet having a predetermined pattern, that is, a structured surface, as shown in FIGS. 1 to 10. The structured surface may be formed by extrusion, stamping, or by curing a separate curable composition in a predetermined pattern, but is not limited thereto. This is expressed as a 'condensing layer' in consideration of the functional aspects, but this expression includes a part of the functions of a conventional structured surface, but it does not limit all of the functions of the layer.

By the way, when the light collecting layer shape is formed from a structure having a polygonal cross section, since the upper portion of the optical sheet is pointed in the shape of a mountain, it may be easily damaged by force or protruding particles applied from the outside, in this regard, embodiments of the present invention The optical sheet according to the present invention includes a resin cured layer made of a curable resin containing an element having slip property in a molecular chain, and may have a damage load of 20 g or more.

The above and hereinafter "curable resin containing an element having slip property in the molecular chain" will be understood as an element having slip property in the curable resin chain, and should not be understood as present as foreign matter in the resin. Will be.

The above and hereinafter "elements having slipperiness" may specifically be F or Si.

The resin cured layer composed of a curable resin containing an element having slip in a molecular chain may be formed from a composition containing a curable monomer containing an element having slip, and specifically, an organosilicon compound having an ethylenically unsaturated group Or a fluorine compound having an ethylenically unsaturated group.

When the resin cured layer made of a curable resin containing an element having slip property in the molecular chain is included as described above, it is possible to provide uniform and continuous slip property as compared with simply including an inorganic material having slip property or coating an inorganic material composition. have. In addition, when a separate inorganic material is included to provide slip property, there is a risk of being precipitated or buried, and phase separation may occur in a fair manner, which may be advantageous in terms of eliminating this point.

It will be appreciated that imparting slippage can reduce damage by ultimately sliding well against the same load by lowering friction.

Meanwhile, in the above and below, the 'damage-resistant load' of the polyethylene terephthalate film comprising a coating layer containing particles having a surface roughness (Sz) of 0.5 μm to 15 μm and a hardness of 2B to 2H on the structured surface. Laminating the coating layer adjacent to each other and pulling the optical sheet at a speed of 300 mm / min while applying a constant load on the polyethylene terephthalate film to observe the damage of the structured surface at the maximum load at the point where substantially no damage occurs. Can be defined. Here, the definition of 'substantially no damage' will be understood to the extent that scratches do not occur during visual observation, as well as the crack or height change of the three-dimensional structure does not occur even when observed by SEM. In this case, the magnification in the observation by SEM may be about X50 to X500.

Meanwhile, the polyethylene terephthalate film including a coating layer containing particles having a surface roughness (Sz) of 0.5 μm to 15 μm and a hardness of 2B to 2H used for the evaluation of damage load is used to impart light diffusion to a polyethylene terephthalate substrate. As a film containing a particle dispersion layer, commercially available examples of such a film include Kolon's LD10, LD14, LD34, and the like. The particle dispersing layer may be formed from a composition including light diffusing particles in the binder resin. The surface roughness was evaluated by the method using Sz, the average surface roughness value of 10 points of the maximum height of 5 points and the minimum height of 5 points, respectively, at a magnification of X500 using a laser microscope, and the hardness was measured by the pencil hardness method (ASTM 3363 method). It may be measured by.

The optical sheet according to the embodiments of the present invention has a damage load of 20 g or more, preferably 30 g or more, more preferably 30 g to 300 g, which is defined as described above. In the case of receiving a crack or distortion occurs in the upper portion of the structural layer there is a fear that it can not perform the function as an optical sheet.

As an example for implementing an optical sheet that satisfies such damage resistance load, the optical sheet material or the composition for forming the light collecting layer of the optical sheet exhibits more elastomeric tendencies than rubber tendencies but does not impair optical properties. The method of using a material is mentioned. That is, the method of using the material by which toughness and elasticity were adjusted suitably is mentioned.

In this respect, a urethane acrylate compound, a styrene compound, a butadiene compound or an isoprene monomer may be considered as a structured surface forming material. In terms of toughness, a bisphenol acrylate compound or a fluorene acrylate compound may be used. It may be advantageous to include further. However, if the above damage resistance load is satisfied, the curable monomer or oligomer included in the structural layer forming material is not limited thereto.

In the case of including a curable monomer containing an element having slip property as described above, it may be more advantageous in achieving the above-mentioned damage resistance load.

In this case, the curable monomer containing an element having slip property may be included in the light collecting layer forming composition, or alternatively, a composition containing the curable monomer and the photoinitiator may be formed by coating the light collecting layer on the light collecting layer.

As such, when the composition including the curable monomer and the photoinitiator containing an element having slip property is formed by coating separately, this is referred to as a "resin cured layer" for convenience.

According to the exemplary embodiments of the present invention, for the convenience of the process of forming the light collecting layer, the light collecting layer forming composition may be 100 to 5,000 cps when the viscosity is 25 ° C.

More advantageously in terms of reducing the occurrence of stains due to toughness or adhesion, the light collecting layer may be formed from a composition having a glass transition temperature of 40 ° C. or less. If the glass transition temperature is higher than 40 ° C., the light collecting layer may lose elasticity and may cause surface damage. More preferably, the glass transition temperature is -15 to 25 ℃.

Meanwhile, according to one embodiment of the present invention, the structured surface of the light collecting layer may have a polygonal, semi-circular or semi-elliptic polyhedron cross section, or may have a pattern having a polygonal, semi-circular or semi-elliptic columnar cross section. Or a curved column shape having a polygonal, semi-circular or semi-elliptic cross section. It may also be a shape in which one or more of these patterns are mixed.

It also includes a case having a structure arranged in at least one concentric shape when viewed in plan view, and has a structure in which mountains and valleys are formed along the concentric circles.

If the cross-section of the structured shape is polygonal, the characteristics of the brightness and the wide viewing angle vary greatly according to the angle of the vertex, and it may be advantageous that the angle of the vertex is 80 to 100 ° in consideration of the brightness and the wide viewing angle due to condensing. It may be more advantageous to be 85-95 °.

In particular, even if a structure having a surface formed from a three-dimensional columnar structure having a triangular cross section having an angle of 90 ° in terms of damage resistance load, occurrence of cracks or distortion of the structured surface can be minimized.

In one example of the optical sheet according to the present invention, the base layer 10 is not limited, but for example, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, polymethacrylate, polymethyl methacrylate, polyacryl It can be formed of any one or more materials selected from the rate, polyimide, polyamide, mainly a polyethylene terephthalate film and a polycarbonate film can be used. The base layer 10 may have a thickness of 10 to 1000 μm in terms of mechanical strength, thermal stability, and flexibility, and preventing loss of transmitted light, and more preferably 15 to 400 μm.

The method for producing the optical sheet of the present invention is not particularly limited, and for example, the optical sheet may be manufactured by preparing the composition for forming the light collecting layer, coating the substrate layer, and curing the same, followed by extrusion or stamping. It can also be prepared by the method.

In the case of forming a separate resin cured layer, after forming the light collecting layer, an ultraviolet curable composition for forming a resin cured layer may be prepared and coated by a method such as spray coating, and then UV curing may be used. It is not.

As an example of such an optical sheet according to the present invention, FIG. 1 shows an optical sheet on which a base layer 10 and a light collecting layer 40 are formed.

At this time, the light collecting layer is made of a curable resin containing an element having slip property in the molecular chain as described above, and more preferably at least one selected from urethane acrylate compound, styrene compound, butadiene compound and isoprene monomer. At least one curable material selected from a compound or a mixture with at least one compound selected from a bisphenol acrylate compound and a fluorene acrylate compound, an organosilicon compound having an ethylenically unsaturated group, or a fluorine compound having an ethylenically unsaturated group and a photoinitiator It may be formed from a curable composition comprising a. In this case, the content of the curable monomer containing an element having slip property in the curable composition for forming the light collecting layer is 0.005 to 5% by weight, which is sufficient to express slip property.

FIG. 2 illustrates a case where the resin cured layer 50 is formed on the light collecting layer 40. In this case, the light collecting layer may not contain an element having slip property in the molecular chain, and preferably, urethane acrylic At least one curable material selected from at least one compound selected from late compounds, styrene compounds, butadiene compounds and isoprene monomers, or mixtures with at least one compound selected from bisphenol acrylate compounds and fluorene acrylate compounds And a curable composition comprising a photoinitiator. In this case, the resin cured layer 50 may be formed from a curable composition including an organosilicon compound having an ethylenically unsaturated group or a fluorine compound having an ethylenically unsaturated group and a photoinitiator.

 3 is a case where the resin cured layer 60 is formed on the other surface of the base layer 10, wherein the resin cured layer 60 is the resin cured layer 50 included in the description of the embodiment illustrated in FIG. 2. It may be the same composition as).

2 to 3, when the resin cured layers 50 and 60 made of a curable resin containing an element having slip property in the molecular chain are formed on the light collecting layer 40 to the base layer 10. Coating methods such as spray coating can be used to evenly coat the entire surface. In this case, the thickness of the cured resin layer may be very thin, less than 1 μm, and even if the thickness is thin, it is possible to impart the desired slip property.

Meanwhile, FIGS. 4 to 10 show one embodiment of the compounded optical sheet as another embodiment of the present invention. It is to be understood herein that "complexation" is integrated so that various optical mechanisms or functions can be implemented.

In addition, as described above, a light collecting layer 40 made of a curable resin containing an element having slip property in the molecular chain may be formed, and the light collecting layer 40 containing no element having slip property in the molecular chain may be formed. In the case of having a resin cured layer made of a curable resin containing an element having a slip property in the molecular chain, as shown in Figures 2 to 3 may be further formed. In addition, in the figure, the case where another resin hardened layer is formed in a composite optical sheet is not shown.

As an example of such a composite optical sheet, a light diffusing layer 20 including light diffusing particles 25 is formed on at least one surface of the substrate layer 10, and foamed on the light diffusing layer 20. An air layer 30 including a bead 35 is formed, and an optical sheet in which a light collecting layer 40 is formed on the air layer 30 is illustrated.

As shown in FIG. 5, the light collecting layer 40 may also include foamed beads 35.

In addition, as shown in FIG. 6, a light diffusing layer including light diffusing particles 25 is formed on at least one surface of the base layer 10 without including the air layer 30, and is foamed on the light diffusing layer 20. The light collecting layer 40 including the beads 35 may be formed. In this case, the light diffusion layer 20 may not be included as shown in FIG. 7.

In addition, as shown in FIG. 8, a light diffusing layer 20 including both the light diffusing particles 25 and the foaming beads 35 is formed on at least one surface of the substrate layer 10, and one surface of the light diffusing layer 20. The optical sheet containing the light condensing layer 40 in the example is mentioned as an example.

The optical sheet shown in FIGS. 4 to 8 all include foam beads 35. As the optical sheet is compounded, the brightness of the optical sheet is lowered by adhering a prism sheet to a member that performs a light diffusion function. The point can be solved by including the foam beads 35.

That is, as shown in FIG. 4, by including the light diffusing particles 25 on the substrate layer 10, the light diffusion function is performed, and the air layer 30 including the foam beads 35 is contained, thereby decreasing the brightness. Can be prevented.

According to FIG. 5, the light collecting layer 40 may further include the foamed beads 35. In this case, luminance may be further improved.

The optical sheet shown in FIG. 6 omits the air layer 30 and includes the foamed beads 35 only in the light collecting layer 40. In this case, the luminance may be somewhat lower than in FIG. 5, but the manufacturing cost may be reduced. In that respect it may be advantageous.

FIG. 7 illustrates an optical sheet including a light collecting layer 40 including foamed beads 35 and light diffusing particles 25 on the substrate layer 10. In this case, the substrate layer 10 is illustrated. In contrast to an optical sheet including a separate light diffusing layer 20 or an air layer 30 between the light collecting layer 40 and the light collecting layer 40, the luminance may be reduced, but the manufacturing process may be reduced, which may be advantageous in terms of reducing the defective rate. have.

In FIG. 8, the light diffusing layer 20 includes the foamed beads 35 and the optically dispersed particles 25. In this case, the light source diffused through the diffused particles is refracted through the air layer of the adjacent foamed beads, and the front direction of the light diffused layer 20 is included. By condensing the optical path, the luminance can be improved.

Such foam beads 35 may be formed by mixing a foaming agent in a resin composition or a binder resin forming a layer including the same, and applying the foaming agent and foaming by applying heat. In other words, a foaming agent is mixed with a resin composition or binder resin constituting the layer including the foamed beads 35, that is, the light diffusion layer 20, the air layer 30, or the light condensing layer 40. After the coating on the diffusion layer 30 or the substrate layer 10 is applied to the foaming agent is foamed while evaporating. The foaming agent is in the form of a bead of a double structure of the shell and the core, and becomes a foamed bead 35 containing air as the core portion swells while being vaporized. At this time, in order to form a sufficient air layer that can be foamed to cause a refractive effect, the particle size of the foam beads 35 is preferably to 2 to 100㎛, which may be 1.2 to 2 times the particle size of the foaming agent before foaming. In addition, the content of the foam beads 35 is preferably 30 to 300 parts by weight based on 100 parts by weight of the binder resin when the layer containing the light diffusion layer or the air layer, the layer containing the foam beads 35 is the light collecting layer 40 In the case of, it is preferable to include 1 to 30 parts by weight based on 100 parts by weight of the curable resin composition.

Although a blowing agent that performs this function is not particularly limited, it is preferable to use isobutane or isopentane, etc., and it is preferable to apply heat of 60 to 200 ° C. for 3 to 300 seconds for proper foaming of the blowing agent, and photocuring. It can also be foamed by the exotherm of the UV curing lamp which occurs incidentally.

When the air layer 30 including the foam beads 35 is formed, the air layer 30 may use an acrylic polyol or the like as the binder resin, and at least one resin that may be used as the binder resin of the light diffusion layer described later. You can also select and use.

The foaming beads 35 can be formed by mixing and foaming the foaming agent in the binder resin. At this time, the thickness of the air layer 30 is preferably 2 to 100㎛.

In addition, if the composite optical sheet of the present invention satisfies the damage load value as described above, as shown in FIGS. 9 to 10, the light diffusing layer 20 is formed on one surface of the base layer 10 and the light diffusing layer is provided. The light condensing layer 40 is formed on the 20, or on one surface of the substrate layer, a particle dispersing layer 70 including the light diffusing particles 25 is formed, and the light condensing layer 40 is formed on the other surface of the substrate layer. It is also possible, of course.

When the particle dispersing layer 70 is provided on the lower surface of the base layer 10, the concealability can be improved.

Also in the composite sheet, the light collecting layer is made of a curable resin containing an element having slip property in the molecular chain as described above, and more preferably, among the urethane acrylate compound, styrene compound, butadiene compound and isoprene monomer. Having at least one curable material selected from at least one compound selected, or a mixture with at least one compound selected from a bisphenol acrylate compound and a fluorene acrylate compound, an organosilicon compound having an ethylenically unsaturated group, or an ethylenically unsaturated group It may be formed from a curable composition comprising a fluorine-based compound and a photoinitiator. In this case, the content of the curable monomer containing an element having slip property in the curable composition for forming the light collecting layer is 0.005 to 5% by weight, which is sufficient to express slip property.

In the case where a resin cured layer made of curable resin containing an element having slip property in the molecular chain is formed on the light collecting layer, the light collecting layer may be one which does not contain an element having slip property in the molecular chain, preferably urethane. At least one curable compound selected from an acrylate compound, a styrene compound, a butadiene compound and an isoprene monomer, or a mixture with at least one compound selected from a bisphenol acrylate compound and a fluorene acrylate compound It may be formed from a curable composition comprising a material, and a photoinitiator. In this case, the resin cured layer 50 may be formed from a curable composition including an organosilicon compound having an ethylenically unsaturated group or a fluorine compound having an ethylenically unsaturated group and a photoinitiator.

 Similarly, in the composite sheet, a cured resin layer may be formed on the remaining surface of the base layer 10, and in this case, the resin cured layer formed on the light collecting layer may have the same composition. .

In the case of separately forming a resin cured layer made of a curable resin containing an element having slip property in the molecular chain, a coating method such as spray coating may be uniformly coated on the light collecting layer 40 to the base layer 10. Can be used. In this case, the thickness of the cured resin layer may be very thin, less than 1 μm, and even if the thickness is thin, it is possible to impart the desired slip property.

In one example of the composite optical sheet according to the present invention, the base layer 10 is not limited, but, for example, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, polymethacrylate, polymethyl methacrylate, It may be formed of any one or more materials selected from polyacrylate, polyimide, and polyamide, and mainly polyethylene terephthalate film and polycarbonate film may be used. The thickness of the base layer 10 may be 10 to 1000 μm in terms of mechanical strength, thermal stability, and flexibility, and in terms of preventing loss of transmitted light, and more preferably 15 to 400 μm.

When the light diffusing layer 20 is formed, the light diffusing layer 20 is formed by dispersing the light diffusing particles 25 in the binder resin, the binder resin is good adhesion to the base layer 10 and is dispersed The compatibility with the light diffusing particles 25 should be good, so that the light diffusing particles 25 may be evenly dispersed in the binder resin to be separated or not easily precipitated. Examples of such binder resins include unsaturated polyesters, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, and hydroxypropyl methacrylate. Acrylate, hydroxyethyl acrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, homopolymer of 2-ethylhexyl acrylate, these Acrylic resins, such as a copolymer or terpolymer, urethane resin, epoxy resin, melamine resin, etc. can be used.

In addition, the light diffusing particles 25 may use a plurality of organic particles or inorganic particles. Representative organic particles include methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, and ethyl acryl. Acrylic particles which are homopolymers or copolymers of latex, isobutyl acrylate, normal butyl acrylate and 2-ethylhexyl acrylate; Olefinic particles such as polyethylene, polystyrene and polypropylene; Copolymer particles of an acrylic resin and an olefin resin; And multi-layered multicomponent particles formed by forming particles of a homopolymer and then overlaid with other types of monomers on the layer. As the inorganic particles, silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, magnesium fluoride and the like can be used. The organic and inorganic particles are merely exemplary and are not limited to the particles of the organic or inorganic materials listed above, and may be replaced by other known materials as long as the main object of the present invention can be achieved. Obviously, such material change is also within the scope of the technical idea of the present invention.

The light diffusing particles 25 may be dispersed in a single layer or multiple layers, preferably having a particle diameter of 1 to 80 μm, and preferably including 50 to 300 parts by weight based on 100 parts by weight of the binder resin. . When the light diffusing particles having such a particle diameter are included in the above content, an appropriate light diffusing effect may be provided while preventing whitening and separation of the particles. The thickness of the light diffusion layer 20 may be 5 to 100 μm.

The components constituting the layer designated as the particle dispersing layer 70 are also equivalent to the binder resin and the light diffusing particles 25 in forming the light diffusing layer 20, and the thickness thereof may be 1 to 100 μm.

The light collecting layer 40 and the other resin cured layer (not shown) have been described above.

By manufacturing the optical sheet composited as described above, the light passing through the base layer 10 is uniformly diffused by the light diffusing particles 25, and the foamed beads 35 serving as the air layer not only prevent luminance decrease. Rather, it helps to spread light. Since the diffused and refracted light passes directly through the light collecting layer 40, the amount of light loss is greatly reduced as compared with the conventional art. Therefore, by separately manufacturing sheets that are manufactured separately to provide the function of light diffusion and brightness, the composition of the mounted sheet including the composite sheet is used separately using the existing light diffusing member and prism sheet according to the mounting configuration. It is advantageous because the manufacturing process and the cost can be reduced and the number of sheets to be mounted in the optical sheet assembly for backlight can be reduced by providing light having the same level of brightness as the case of light diffusion and improving concealment.

Hereinafter, examples of the present invention will be described in more detail, but the scope of the present invention is not limited to these examples.

In the following Examples, the measurement of the glass transition temperature of the composition is determined by the results measured by differential scanning calorimetry (DSC) according to ASTM E1356.

Preparation of Urethane Acrylate Oligomer

Synthesis Example 1

0.195 mol of ether-based polyols (PPG, Lupranol 1100 from BASF) and 0.243 mol of 1,6-hexanediol in a 1000 ml four-necked flask equipped with an oil bath, a thermometer, a reflux cooler, and a dropwise funnel, dibutyl tin dilaurate After mixing 0.03g and stirring for 30 minutes at 70 ~ 80 ℃, 2.154 mol of diphenylmethane diisocyanate is added in 2 to 3 steps at intervals of about 1 hour, and the reaction proceeds for about 5 hours in total. A urethane prepolymer made of isocyanate was prepared. At this time, the value of R (N = C = O / OH, ratio of isocyanate group and hydroxyl group) of the prepolymer having an isocyanate terminal is about 1.66, and the ratio of HS (Hard Segment) / SS (Soft Segment) of the urethane prepolymer Is about 1 / 3.9.

Then, to prevent thermal polymerization of the vinyl group, the temperature of the reactor was dropped to about 50 ° C., and 0.657 mol of hydroxyethyl acrylate was added thereto, followed by stirring for 4 to 6 hours until the isocyanate groups were completely consumed. The FT-IR spectrum confirmed that there was no residual isocyanate as a characteristic peak of N = C = O around 2270 cm ^-1 , and the reaction was terminated to obtain a urethane acrylate oligomer.

Synthesis Example 2

The same method as in Synthesis Example 1 except for using the urethane prepolymer obtained by adjusting the ratio of polyol, chain extender and diphenylmethane diisocyanate such that the ratio of Hard Segment (SS) / SS (Soft Segment) is about 1 / 2.65. Urethane acrylate oligomer was prepared.

Synthesis Example 3

The same method as in Synthesis Example 1, except using a urethane prepolymer obtained by adjusting the ratio of polyol, chain extender and diphenylmethane diisocyanate such that the ratio of HS (Hard Segment) / SS (Soft Segment) is about 1 / 1.51. Urethane acrylate oligomer was prepared.

Synthesis Example 4

The same method as in Synthesis Example 1 except for using the urethane prepolymer obtained by adjusting the ratio of polyol, chain extender and diphenylmethane diisocyanate such that the ratio of Hard Segment (SS) / SS (Soft Segment) is about 1 / 1.32 Urethane acrylate oligomer was prepared.

Optical sheet manufacturers

Example 1

69.5 parts by weight of the urethane acrylate oligomer prepared in Synthesis Example 1, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), and phenoxyethyl acrylate (Sartomer, SR339) based on 100 parts by weight of the total composition Parts by weight, photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide, 1.5 parts by weight, photoinitiator methylbenzoylformate, 1.5 parts by weight, additive bis (1,2,2,6,6-pentamethyl-4-piperi Dill) 2 parts by weight of sebacate and 0.5 parts by weight of silicone acrylate were mixed and mixed at 60 ° C for 1 hour to prepare a composition (glass transition temperature of -30 ° C or less). Subsequently, it is applied to one surface of polyethylene terephthalate (KOLON), which is a substrate layer, placed on a frame of a prism roller at 35 ° C., and a type-D bulb is mounted on an ultraviolet irradiation device (Fusion, 600 Watt / inch ² ), and then the substrate layer is oriented. Irradiated at 900mJ / cm ² to form a linear triangular prism having a prism vertex angle of 90 °, pitch of 50 ㎛, height 25 ㎛ to prepare an optical sheet.

Example 2

In Example 1, an optical sheet was manufactured by forming a lenticular lens having a semicircular cross section, a pitch of 50 μm, and a height of 25 μm.

Example 3

In Example 1, an optical sheet was manufactured by forming a linear prism having a semicircular cross section, a pitch of 50 μm, and a height of 25 μm.

Example 4

In Example 1, an optical sheet was manufactured by forming a linear prism having a pentagonal cross section, a vertex angle of 95 °, a pitch of 50 µm, and a height of 25 µm.

Example 5

In Example 1, an optical sheet was manufactured by forming a curved prism having a semicircular cross section, a pitch of 50 μm, and a height of 25 μm.

Example 6

An optical sheet was manufactured in the same manner as in Example 1, except that the urethane acrylate oligomer obtained in Synthesis Example 2 was used. At this time, the glass transition temperature of the crude liquid was -22 ° C.

Example 7

An optical sheet was manufactured in the same manner as in Example 1, except that the urethane acrylate oligomer obtained in Synthesis Example 3 was used. At this time, the glass transition temperature of the crude liquid was -15 ° C.

Example 8

An optical sheet was manufactured in the same manner as in Example 1, except that the urethane acrylate oligomer obtained in Synthesis Example 4 was used. At this time, the glass transition temperature of the crude liquid was -7 ℃.

Example 9

59.5 parts by weight of the urethane acrylate oligomer and bisphenol-A acrylate instead of 69.5 parts by weight of the urethane acrylate oligomer in Example 1 An optical sheet was prepared in the same manner except adding 10 parts by weight. At this time, the glass transition temperature of the crude liquid was 2 ° C.

Example 10

An optical sheet was manufactured in the same manner as in Example 1, except that 49.5 parts by weight of urethane acrylate oligomer and 20 parts by weight of bisphenol A acrylate were added instead of 69.5 parts by weight of urethane acrylate oligomer. At this time, the glass transition temperature of the crude liquid was 9 ° C.

Example 11

An optical sheet was manufactured in the same manner as in Example 1, except that 39.5 parts by weight of urethane acrylate oligomer and 30 parts by weight of bisphenol A acrylate were added instead of 69.5 parts by weight of urethane acrylate oligomer. At this time, the glass transition temperature of the crude liquid was 15 degreeC.

Example 12

An optical sheet was manufactured in the same manner as in Example 1, except that 29.5 parts by weight of urethane acrylate oligomer and 40 parts by weight of bisphenol A acrylate were added instead of 69.5 parts by weight of urethane acrylate oligomer. At this time, the glass transition temperature of the crude liquid was 25 ℃.

Example 13

An optical sheet was manufactured in the same manner as in Example 1, except that 50 parts by weight of bisphenol A acrylate was added to 19.5 parts by weight of urethane acrylate oligomer instead of 69.5 parts by weight of urethane acrylate oligomer. At this time, the glass transition temperature of the crude liquid was 38 degreeC.

Comparative Example 1

3M BEFIII prism film was used as an optical sheet.

Comparative Example 2

Doosan Corporation's Brtie-200 prism film was used as the optical sheet.

Comparative Example 3

LG's LES-T2 prism film was used as the optical sheet.

In each of the above Examples and Comparative Examples, the damage load, scratch resistance and luminance of the optical sheet were measured as follows.

(1) damage load

A. 1st test: On the optical sheet (standard 30 * 10cm) which concerns on an Example and a comparative example, of the coating layer and optical sheet of a commercially available LD14 film (coating layer surface roughness Sz = 2.3um, hardness F, the product of Kolon) The structured surface was laminated so as to abut.

Then, a weight having a constant load was placed on the polyethylene terephthalate film, and the optical sheet was pulled at a speed of 300 mm / min, and then the structured surface of the optical sheet was observed by visual observation and SEM (S4300, manufactured by Hitachi). It was. At this time, a friction coefficient measuring instrument (manufactured by Toyoseiki Co., Ltd.) was used as a means of pulling the optical sheet at a constant speed.

By evaluating the weight of the weights at different weights, the maximum load at which substantially no damage was caused to the structured surface of the optical sheet was measured and this was determined as the damage resistance load.

The analysis by SEM was made into the magnification X300 at this time.

B. 2nd test: The optical sheet according to the Example and the comparative example was structured of the coating layer of the commercially available LD10 film (coating layer surface roughness Sz = 5.5um, hardness F, specification 30 × 10cm, manufactured by Kolon) and the optical sheet. The surface was laminated so as to be in contact.

Thus, the damage resistance load was evaluated by the same method as the said 1st test except having changed the coating layer of the laminated | multilayer film.

C. Third test: Structured optical sheet according to Examples and Comparative Examples was coated with commercially available LD34 film (coating layer surface roughness Sz = 10.5um, hardness F, standard 30 × 10 cm, manufactured by Kolon) and optical sheet The surface was laminated so as to be in contact.

Thus, the damage resistance load was evaluated by the same method as the said 1st test except having changed the coating layer of the laminated | multilayer film.

(2) scratch resistance

When a minimum pressure was applied to the optical sheets of the Examples and Comparative Examples using the basic weight of the Big Heart test apparatus of IMOTO, the scratches of the structural layer were measured, and the results are shown in Table 1 below. The degree of damage was visually judged and the criteria are as follows.

Bad scratch resistance ← × <△ <○ <◎ → Excellent scratch resistance

(3) Whether adhesion occurs after high temperature and high humidity

The optical sheets of Examples and Comparative Examples were mounted in a module state at a temperature of 60 ° C., a humidity of 80%, and 250 hours to observe whether they were in close contact.

No close contact: ◎, low level of contact: ○, medium level of contact: △, strong level of contact: ×

(4) luminance

The optical sheet of each of the above Examples and Comparative Examples was laminated and fixed on a backlight unit for 17-inch liquid crystal display panel (Model: LM170E01, manufactured by Heesung Electronics, Korea), and a luminance meter (Model: BM-7, TOPCON, Japan) was used. The luminance was measured at any of 13 points, and the average value was obtained.

(5) frictional force

The optical sheet was measured using a SLED having a standard weight of 200 g by a friction test apparatus of Toyoseiki.

division Damage load (g) Scratch resistance Level of adhesion Luminance (cd / ㎡) First Exam Second test Third Exam Example 1 450 g 350 g 250 g ◎ ◎ 2425 Example 2 550 g 500 g 400 g ◎ ○ 2245 Example 3 500 g 450 g 400 g ◎ ○ 2106 Example 4 400 g 350 g 300 g ◎ ◎ 2410 Example 5 350 g 300 g 250 g ◎ ◎ 2418 Example 6 270 g 250 g 200 g ◎ ◎ 2401 Example 7 250 g 230 g 180 g ◎ ◎ 2364 Example 8 230 g 200 g 150 g ◎ ◎ 2347 Example 9 250 g 200 g 150 g ◎ ◎ 2430 Example 10 220 g 180 g 100 g ◎ ◎ 2435 Example 11 170 g 150 g 70 g ◎ ◎ 2438 Example 12 100 g 70 g 50 g ◎ ◎ 2440 Example 13 50 g 30 g 20g ○ ◎ 2445 Comparative Example 1 10g 7 g 3 g × ◎ 2494 Comparative Example 2 10g 5 g 3 g × ◎ 2476 Comparative Example 3 10g 5 g 3 g × ◎ 2466

Table 1 and the optical sheet according to the embodiments of the present invention can be seen that the scratch resistance of the structured surface is very excellent. In addition, the inherent brightness of the optical sheet was also found to be appropriate.

These results indicate that the structure of the optical sheet of the present invention does not cause damages such as cracks or distortion of the structure due to a certain force applied from the outside, and thus it can be expected that the lowering of the luminance due to the structural layer damage did not occur. have.

Particularly, when the glass transition temperature has a structured surface from the crude liquid having a temperature of about 15 to 25 ° C., the damage resistance is appropriate and the stain due to the adhesion is not generated.

Example 14

30 parts by weight of methyl ethyl ketone and 80 parts by weight of toluene are contained in 100 parts by weight of an acrylic resin (52-666, manufactured by Aekyung Chemical Co., Ltd.) on one side of a 188 μm ultra-transparent polyethylene terephthalate film (FHSS, manufactured by Kolon Corporation) which is a base material layer. After weighing and diluting to prepare a binder resin having a refractive index of 1.49, spherical polymethyl methacrylate particles (MH20F, manufactured by Kolon Corporation) having a refractive index of 1.49 having an average particle diameter of 20 μm were mixed at 150 parts by weight with respect to the binder resin, using a milling machine. After monodispersing into a single layer, it was coated using a gravure coater and cured at 120 ° C. for 60 seconds to apply a light diffusion layer (refractive index: 1.49) to a thickness of 25 μm after drying.

An air layer was formed on one surface of the cured light diffusing layer as follows; 50 parts by weight of methyl ethyl ketone and 90 parts by weight of toluene were weighed and diluted to 100 parts by weight of an acrylic resin (52-666, manufactured by Aekyung Chemical Co., Ltd.) to prepare a binder resin having a refractive index of 1.49, and then isobutane was used with respect to 100 parts by weight of the binder resin. 50 parts by weight of the particles were mixed and monodispersed into a single layer using a milling machine, which was coated using a gravure coater, and applied to a thickness of 20 μm after drying. After the gravure coating was heat-treated at 120 ℃ for 60 seconds so that the average particle diameter of the isobutane particles to 15㎛.

A light collecting layer was formed on one surface of the air layer as follows; 69.5 parts by weight of the urethane acrylate oligomer prepared in Synthesis Example 1, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), 15 parts by weight of phenoxyethyl acrylate (Sartomer, SR339), photoinitiator 2,4, 1.5 parts by weight of 6-trimethylbenzoyl diphenylphosphine oxide, 1.5 parts by weight of photoinitiator methylbenzoylformate, 2.0 parts by weight of additive bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and 0.5 parts by weight of silicone acrylate was mixed and mixed at 60 ° C. for 1 hour to prepare a photosensitive composition (glass transition temperature of −30 ° C. or less). Then, the composition is applied to one surface of the air layer and placed on a frame of a prism roller at 35 ° C., and a type-D bulb is mounted on an ultraviolet irradiation device (Fusion, 600 Watt / inch ² ), and 900 mJ / cm ² in the substrate layer direction. The optical sheet was manufactured by forming a linear triangular prism having a prism vertex angle of 90 °, a pitch of 50 mu m, and a height of 25 mu m.

Example 15

In Example 14, an optical sheet was manufactured by forming a lenticular lens having a semicircular cross section, a pitch of 50 μm, and a height of 25 μm at the time of forming the light collecting layer.

Example 16

In Example 14, an optical sheet was manufactured by forming a linear prism having a semicircular cross section, a pitch of 50 μm, and a height of 25 μm at the time of forming the light collecting layer.

Example 17

In Example 14, an optical sheet was manufactured by forming a linear prism having a pentagonal cross section, a vertex angle of 95 °, a pitch of 50 µm, and a height of 25 µm when the light collecting layer was formed.

Example 18

In Example 14, an optical sheet was manufactured by forming a curved prism having a semicircular cross section, a pitch of 50 μm, and a height of 25 μm at the time of forming the light collecting layer.

Example 19

In Example 14, an optical sheet was prepared in the same manner except for using the photosensitive composition using the urethane acrylate oligomer obtained in Synthesis Example 2 when forming the light collecting layer. At this time, the glass transition temperature of the crude liquid was -22 ° C.

Example 20

In Example 14, an optical sheet was manufactured in the same manner as in Example 1, except that the photosensitive composition using the urethane acrylate oligomer obtained in Synthesis Example 3 was used to form the light collecting layer. At this time, the glass transition temperature of the crude liquid was -15 ° C.

Example 21

In Example 14, an optical sheet was manufactured in the same manner as in Example 1, except that the photosensitive composition using the urethane acrylate oligomer obtained in Synthesis Example 4 was used to form the light collecting layer. At this time, the glass transition temperature of the crude liquid was -7 ℃.

Example 22

In Example 14, 59.5 parts by weight of the urethane acrylate oligomer and bisphenol-A acrylate instead of 69.5 parts by weight of the urethane acrylate oligomer when forming the light collecting layer An optical sheet was prepared in the same manner except that the photosensitive composition to which 10 parts by weight was added was used. At this time, the glass transition temperature of the crude liquid was 2 ° C.

Example 23

An optical sheet according to the same method as in Example 14, except that 49.5 parts by weight of the urethane acrylate oligomer and 20 parts by weight of the bisphenol A acrylate were added instead of 69.5 parts by weight of the urethane acrylate oligomer when forming the light collecting layer. Was prepared. At this time, the glass transition temperature of the crude liquid was 9 ° C.

Example 24

An optical sheet according to the same method as in Example 14, except that 39.5 parts by weight of urethane acrylate oligomer and 30 parts by weight of bisphenol A acrylate were used instead of 69.5 parts by weight of urethane acrylate oligomer when forming the light collecting layer. Was prepared. At this time, the glass transition temperature of the crude liquid was 15 degreeC.

Example 25

An optical sheet according to the same method as in Example 14, except that 29.5 parts by weight of the urethane acrylate oligomer and 40 parts by weight of the bisphenol A acrylate were used instead of 69.5 parts by weight of the urethane acrylate oligomer when forming the light collecting layer. Was prepared. At this time, the glass transition temperature of the crude liquid was 25 ℃.

Example 26

In Example 14, except that the photosensitive composition was added to 19.5 parts by weight of urethane acrylate oligomer, 50 parts by weight of bisphenol A acrylate was used instead of 69.5 parts by weight of urethane acrylate oligomer when forming the light collecting layer. Sheets were prepared. At this time, the glass transition temperature of the crude liquid was 38 degreeC.

Example 27

In Example 14, the optical sheet was manufactured in the same manner except that the isobutane particles were mixed at 100 parts by weight with respect to 100 parts by weight of the binder resin when forming the air layer.

Example 28

In Example 14, an optical sheet was manufactured in the same manner except that no air layer was formed.

Example 29

30 parts by weight of methyl ethyl ketone and 80 parts by weight of toluene are contained in 100 parts by weight of an acrylic resin (52-666, manufactured by Aekyung Chemical Co., Ltd.) on one side of a 188 μm ultra-transparent polyethylene terephthalate film (FHSS, manufactured by Kolon Corporation) which is a base material layer. After weighing and diluting to prepare a binder resin having a refractive index of 1.49, spherical polymethyl methacrylate particles (MH20F, manufactured by Kolon Corporation) having a refractive index of 1.49 having an average particle diameter of 20 μm were mixed at 150 parts by weight with respect to the binder resin, using a milling machine. After monodispersing into a single layer, it was coated using a gravure coater and cured at 120 ° C. for 60 seconds to apply a light diffusion layer (refractive index: 1.49) to a thickness of 25 μm after drying.

An air layer was formed on one surface of the cured light diffusing layer as follows; 50 parts by weight of methyl ethyl ketone and 90 parts by weight of toluene were weighed and diluted to 100 parts by weight of an acrylic resin (52-666, manufactured by Aekyung Chemical Co., Ltd.) to prepare a binder resin having a refractive index of 1.49, and then isobutane was used with respect to 100 parts by weight of the binder resin. 50 parts by weight of the particles were mixed and monodispersed into a single layer using a milling machine, which was coated using a gravure coater, and applied to a thickness of 20 μm after drying. After the gravure coating was heat-treated at 120 ℃ for 60 seconds so that the average particle diameter of the isobutane particles to 15㎛.

A light collecting layer was formed on one surface of the air layer as follows; 39.5 parts by weight of urethane acrylate oligomer prepared in Synthesis Example 1, 30 parts by weight of bisphenol A acrylate, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), phenoxyethyl acrylate (Sartomer, SR339) 15 parts by weight, photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide 1.5 parts by weight, photoinitiator methylbenzoylformate 1.5 parts by weight, additive bis (1,2,2,6,6-pentamethyl-4-pi Ferridyl) To 5 parts by weight of polymethyl methacrylate particles (MH20F, Kolon) and 5 parts by weight of isobutane particles to 100 parts by weight of the photosensitive composition mixed 2.0 parts by weight of sebacate and 0.5 parts by weight of silicone acrylate. The composition (glass transition temperature 15 ℃) obtained by mixing for 1 hour at 60 ° C was applied on the air layer, placed on a frame of a 35 ° C prism roller, and then type-typed into an ultraviolet irradiation device (Fusion, 600 Watt / inch ² ). D bulb Mounted is irradiated with 900mJ / cm ² in the direction of the substrate layer a prism apex angle is 90 °, a pitch of 50㎛, at the same time heat generated in the curing ultraviolet gyeonghwagi to a height of the linear triangular prisms forming the 25㎛ (150 ℃, 5 seconds) The isobutane particles were foamed to obtain an average particle diameter of 15 μm, and a light collecting layer having a refractive index of 1.56 was formed.

Example 30

In Example 29, the optical sheet was manufactured in the same manner except that the light collecting layer was formed on the optical scattering layer without forming an air layer.

Example 31

39.5 parts by weight of the urethane acrylate oligomer obtained in Synthesis Example 1, 30 parts by weight of bisphenol-A acrylate, and phenoxy, on one side of a 188 μm ultra-transparent polyethylene terephthalate film (FHSS, manufactured by Kolon Corporation) as the base material layer 10 parts by weight of ethyl ethyl methacrylate (Sartomer, SR340), 15 parts by weight of phenoxyethyl acrylate (Sartomer, SR339), 1.5 parts by weight of photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide, methylbenzoylfo with photoinitiator 100 parts by weight of a mate, 2.0 parts by weight of an additive bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and 0.35 parts by weight of a silicone acrylate, to 100 parts by weight of a polymethylmethacrylate. 5 parts by weight of acrylate particles (MH20F, Kolon) and 5 parts by weight of isobutane particles were mixed and mixed at 60 ° C for 1 hour to apply a composition (glass transition temperature of 15 ° C) to a prism at 35 ° C. brother Put the type-D bulb on the frame of upper roller and UV irradiation device (Fusion, 600Watt / inch ² ) and irradiate 900mJ / cm ² in the direction of substrate layer.The prism vertex angle is 90 °, the pitch is 50㎛, and the height is high. A 25 μm linear triangular prism was formed and isobutane particles were foamed with a heat of curing (150 ° C., 5 seconds) generated in an ultraviolet curing machine, so that an average particle diameter was 15 μm, and a light condensing layer having a refractive index of 1.56 was formed.

Example 32

An optical sheet was manufactured in the same manner as in Example 29, except that a composition obtained by mixing 10 parts by weight of isobutane particles with respect to 100 parts by weight of the photosensitive composition was used when forming the light collecting layer.

Example 33

An optical sheet was manufactured in the same manner as in Example 31, except that a composition obtained by mixing 7 parts by weight of isobutane particles with respect to 100 parts by weight of the photosensitive composition was used when forming the light collecting layer.

Example 34

An optical sheet was manufactured in the same manner as in Example 31, except that a composition obtained by mixing 9 parts by weight of isobutane particles with respect to 100 parts by weight of the photosensitive composition was used when forming the light collecting layer.

Example 38

In Example 34, the optical sheet was manufactured in the same manner except for the use of a composition in which the polymethyl methacrylate particles were mixed in an amount of 3 parts by weight based on 100 parts by weight of the photosensitive composition.

Example 36

In Example 31, the optical sheet was manufactured in the same manner as in the same method, except that the composition in which the polymethyl methacrylate particles were mixed at 7 parts by weight based on 100 parts by weight of the photosensitive composition was used.

Example 37

30 parts by weight of methyl ethyl ketone and 80 parts by weight of toluene are contained in 100 parts by weight of an acrylic resin (52-666, manufactured by Aekyung Chemical Co., Ltd.) on one side of a 188 μm ultra-transparent polyethylene terephthalate film (FHSS, manufactured by Kolon Corporation) which is a base material layer. After weighing and diluting to prepare a binder resin having a refractive index of 1.49, spherical polymethyl methacrylate particles (MH20F, manufactured by Kolon Corporation) having a refractive index of 1.49 having an average particle diameter of 20 μm were 50 parts by weight of the binder resin, and isobutane particles were prepared. 50 parts by weight of the mixture was monodisperse into a single layer using a milling machine, which was coated using a gravure coater and cured at 120 ° C. for 60 seconds to apply a light diffusing layer (refractive index: 1.49) to a thickness of 25 μm after drying.

Condensing layer was formed on one surface of the cured light diffusing layer as follows; 39.5 parts by weight of urethane acrylate oligomer prepared in Synthesis Example 1, 30 parts by weight of bisphenol A acrylate, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), phenoxyethyl acrylate (Sartomer, SR339) 15 parts by weight, photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide 1.5 parts by weight, photoinitiator methylbenzoylformate 1.5 parts by weight, additive bis (1,2,2,6,6-pentamethyl-4-pi Ferridyl) Sebacate 2.0 parts by weight and 0.5 parts by weight of silicone acrylate was applied at 60 ° C. for 1 hour, and the composition (glass transition temperature 15 ° C.) was applied and placed on a frame of a 35 ° C. prism roller. , 600Watt / inch ² ), and mounted a type-D bulb to irradiate 900mJ / cm ² in the direction of the substrate layer to form a linear triangular prism having a prism vertex angle of 90 °, pitch of 50 μm, and height of 25 μm (refractive index of 1.56). ).

Example 38

30 parts by weight of methyl ethyl ketone and 80 parts by weight of toluene are contained in 100 parts by weight of an acrylic resin (52-666, manufactured by Aekyung Chemical Co., Ltd.) on one side of a 188 μm ultra-transparent polyethylene terephthalate film (FHSS, manufactured by Kolon Corporation) which is a base material layer. After weighing and diluting to prepare a binder resin having a refractive index of 1.49, 100 parts by weight of the spherical polymethyl methacrylate particles (MH20F, manufactured by Kolon Corporation) having a refractive index of 1.49 having an average particle diameter of 20 μm was mixed using a milling machine. After monodispersing into a single layer, it was coated using a gravure coater and cured at 120 ° C. for 60 seconds to apply a particle dispersion layer (refractive index: 1.49) to a thickness of 25 μm after drying.

On the other side of the substrate layer, a light collecting layer was formed as follows; 39.5 parts by weight of urethane acrylate oligomer prepared in Synthesis Example 1, 30 parts by weight of bisphenol A acrylate, 10 parts by weight of phenoxyethyl methacrylate (Sartomer, SR340), phenoxyethyl acrylate (Sartomer, SR339) 15 parts by weight, photoinitiator 2,4,6-trimethylbenzoyl diphenylphosphine oxide 1.5 parts by weight, photoinitiator methylbenzoylformate 1.5 parts by weight, additive bis (1,2,2,6,6-pentamethyl-4-pi Ferridyl) Sebacate 2.0 parts by weight and silicone acrylate (0.5 parts by weight) was applied at 60 ° C. for 1 hour, and a composition (glass transition temperature 15 ° C.) was applied and placed on a frame of a prism roller at 35 ° C., and irradiated with ultraviolet light. (Fusion, 600Watt / inch ² ) mounted a type-D bulb and irradiated 900mJ / cm ² in the direction of the substrate layer to form a linear triangular prism with a prism vertex angle of 90 °, pitch of 50 μm, and height of 25 μm. (Refractive index 1.56).

Comparative Example 4

A prism film (LC213, manufactured by Kolon Corporation) was laminated on one surface of the light diffusion film (LD602, manufactured by Kolon Corporation).

Comparative Example 5

A prism film (3M BEF III) was laminated on one surface of the light diffusion film (LD602, manufactured by Kolon Corporation).

Comparative Example 6

A prism film (Brtie-200 from Doosan Corporation) was laminated on one surface of the light diffusion film (LD602, manufactured by Kolon Corporation).

Comparative Example 7

A prism film (LES-T2 from LG Corp.) was laminated on one surface of the light diffusion film (LD602, manufactured by Kolon Corporation).

Damage load, scratch resistance, brightness and frictional force of the optical sheets obtained in the above Examples and Comparative Examples were measured in the same manner as described above. In addition, the concealability was evaluated in the following manner. The results are shown in Table 2 below.

Concealable

Luminance was measured after the backlight was turned on and preheated for 2 hours using the BM-7 of Topcon, and the value was removed from all the sheets except the reflective sheet and diffuser in the backlight unit (BLU, 32 inches). And a webber fraction (Waber Fraction,%) in which the difference between the highest luminance value and the lowest luminance value divided by the highest luminance value was measured by measuring the intervals of 1 mm on all sides of the brightest part by mounting the optical member manufactured in Comparative Example. ) Value was measured, and this value represents the lamp hiding property of the optical member manufactured according to the above Examples and Comparative Examples. The larger the Weber fraction, the lower the hiding property.

division Damage load (g) Scratch resistance Level of adhesion Luminance (cd / ㎡) Concealability (%) First Exam Second test Third Exam Example 14 450 g 350 g 250 g ◎ ◎ 2525 0.71 Example 15 550 g 500 g 400 g ◎ ○ 2247 0.68 Example 16 500 g 450 g 400 g ◎ ○ 2133 0.70 Example 17 400 g 350 g 300 g ◎ ◎ 2475 0.70 Example 18 350 g 300 g 250 g ◎ ◎ 2449 0.68 Example 19 270 g 250 g 200 g ◎ ◎ 2520 0.70 Example 20 250 g 230 g 180 g ◎ ◎ 2520 0.69 Example 21 230 g 200 g 150 g ◎ ◎ 2528 0.70 Example 22 250 g 200 g 150 g ◎ ◎ 2530 0.70 Example 23 220 g 180 g 100 g ◎ ◎ 2532 0.69 Example 24 170 g 150 g 70 g ◎ ◎ 2535 0.69 Example 25 100 g 70 g 50 g ◎ ◎ 2530 0.70 Example 26 50 g 30 g 20g ○ ◎ 2532 0.69 Example 27 450 g 350 g 250 g ◎ ◎ 2548 0.72 Example 28 450 g 350 g 250 g ◎ ◎ 2501 0.80 Example 29 210 g 170 g 100 g ◎ ◎ 2527 0.70 Example 30 210 g 170 g 100 g ◎ ◎ 2508 0.73 Example 31 200 g 150 g 70 g ◎ ◎ 2500 0.72 Example 32 220 g 170 g 100 g ◎ ◎ 2518 0.68 Example 33 180 g 150 g 70 g ◎ ◎ 2520 0.70 Example 34 180 g 150 g 70 g ◎ ◎ 2511 0.67 Example 35 150 g 120 g 70 g ◎ ◎ 2505 0.71 Example 36 150 g 120 g 70 g ◎ ◎ 2503 0.70 Example 37 150 g 100 g 70 g ◎ ◎ 2489 0.72 Example 38 150 g 100 g 70 g ◎ ◎ 2480 0.71 Comparative Example 4 10g 70 g 5 g × ◎ 2580 0.80 Comparative Example 5 10g 7 g 3 g × ◎ 2533 0.80 Comparative Example 6 10g 5 g 3 g × ◎ 2528 0.80 Comparative Example 7 10g 5 g 3 g × ◎ 2522 0.80

From Table 2, it can be seen that the optical sheet according to the embodiment of the present invention is very excellent in scratch resistance of the structured surface. In addition, the inherent brightness of the optical sheet was also found to be appropriate.

These results indicate that the structure of the optical sheet of the present invention does not cause damages such as cracks or distortion of the structure due to a certain force applied from the outside, and thus it can be expected that the lowering of the luminance due to damage to the light collecting layer does not occur. have.

Particularly, when the glass transition temperature has a structured surface from the crude liquid having a temperature of about 15 to 25 ° C., the damage resistance is appropriate and the stain due to the adhesion is not generated.

In addition, although the optical sheet according to the embodiments of the present invention was composited, it could be seen that the same brightness and concealment as that of the case of laminating a conventional prism film and a light diffusing film may be provided.

Moreover, the inclusion of foam beads showed better brightness or concealability than the case without foam beads.

Therefore, it is possible to increase the utilization efficiency of the light source while minimizing the light loss and to increase the brightness and concealment. In addition, since the protective film may also be omitted as the light collecting layer may prevent damage due to film lamination, it is expected that the problem caused by laminating a plurality of films may be prevented.

1 to 10 are cross-sectional views of an optical sheet according to an embodiment of the present invention.

<Description of the symbols in the main part of the drawing>

10: base material layer 20: light diffusion layer

25 light diffusing particle 30 air layer

35: foaming beads 40: light collecting layer

50, 60: resin cured layer

70: particle dispersing layer

Claims (32)

In an optical sheet having a structured surface, It includes a resin cured layer made of a curable resin containing an element having slip in the molecular chain, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; And It is formed on the base material layer, it consists of curable resin containing the element which has a slip property in a molecular chain, and includes the light condensing layer structured in the surface, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs substantially when the optical sheet is pulled at a speed of 300 mm / min and the structured surface is inspected for damage. A base layer; A light collecting layer formed on the base layer, made of a curable resin, and having a structured surface; And A resin cured layer formed on the light collecting layer and composed of a curable resin containing an element having slip property in a molecular chain, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; An air layer formed on the light diffusion layer and including a binder resin and foam beads; And A light-condensing layer formed of a curable resin formed on the air layer, containing or not effervescent beads, and containing elements having a slip property in the molecular chain, and having a structured surface; An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; And A light collecting layer formed on the light diffusing layer, comprising a curable resin containing foam beads, and containing elements having a slip property in the molecular chain, and including a structured light collecting layer, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; And A light condensing layer formed on the light diffusing layer, comprising a curable resin containing an element having slip property in the molecular chain, and having a structured light collecting layer, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; A particle dispersing layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; And It is formed on the other side of the base layer and comprises a light-condensing layer consisting of a curable resin containing an element having a slip property in the molecular chain, the surface structured, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage-resistant load: On the optical sheet, a surface layer (Sz) of 0.5 µm to 15 µm and a coating layer of polyethylene terephthalate film including a coating layer containing particles having a hardness of 2B to 2H are laminated adjacently, and a polyethylene terephthalate film Maximum load at the point where substantially no damage occurs when the optical sheet is pulled at a speed of 300 mm / min and a structured surface is observed under constant load on the phase. A base layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin, light diffusing particles, and foam beads; And It is formed on the light diffusion layer, made of a curable resin containing an element having a slip property in the molecular chain, and includes a light collecting layer structured on the surface, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; And It is formed on at least one surface of the substrate layer, comprises a curable resin containing foamed beads and light-diffusing particles, containing an element having slip in the molecular chain, and comprises a light-condensing layer structured on the surface, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; An air layer formed on the light diffusion layer and including a binder resin and foam beads; A light collecting layer formed on the air layer and made of a curable resin containing or without foamable beads and having a structured surface; And A resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs substantially when the optical sheet is pulled at a speed of 300 mm / min and the structured surface is inspected for damage. A base layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; A light collecting layer formed on the light diffusing layer and made of a curable resin including foamed beads, the surface of which is structured; And A resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin and light diffusing particles; A light collecting layer formed on the light diffusing layer and having a structured surface; And A resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; A particle dispersing layer formed on one surface of the substrate layer and including a binder resin and light diffusing particles; A light collecting layer formed on the other side of the base layer and having a structured surface; And A resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs substantially when the optical sheet is pulled at a speed of 300 mm / min and the structured surface is inspected for damage. A base layer; A light diffusion layer formed on at least one surface of the substrate layer and including a binder resin, light diffusing particles, and foam beads; A light collecting layer formed on the light diffusing layer and having a structured surface; And A resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. A base layer; A light collecting layer formed on at least one surface of the substrate layer and made of a curable resin including foamed beads and light diffusing particles, and having a structured surface; And A resin cured layer formed on the light collecting layer and made of a curable resin containing an element having slip property in a molecular chain, An optical sheet having a damage resistance load of 20 g or more, defined as follows. Damage resistance load: On the optical sheet, the coating layer of the polyethylene terephthalate film including the coating layer containing particles having a surface roughness (Sz) of 0.5 µm to 15 µm and a hardness of 2B to 2H is laminated adjacently, and onto the polyethylene terephthalate film The maximum load at which no damage occurs when the structure of the surface is observed by pulling the optical sheet at a speed of 300mm / min while applying a constant load to the sheet. The optical sheet according to any one of claims 1 to 15, wherein the damage resistance load is 30 g or more. The optical sheet according to any one of claims 1 to 15, wherein the damage resistance load is 30 g to 500 g. The optical sheet according to any one of claims 1 to 15, wherein the element having slip property is F or Si. The curable resin layer according to any one of claims 1, 3 and 10 to 15, wherein the cured resin layer is formed from a curable composition comprising an organosilicon compound having an ethylenically unsaturated group or a fluorine compound having an ethylenically unsaturated group and a photoinitiator. An optical sheet, characterized in that formed. The method of claim 1, wherein the resin cured layer is at least one compound selected from urethane acrylate compound, styrene compound, butadiene compound and isoprene monomer, or at least one selected from bisphenol acrylate compound and fluorene acrylate compound At least one curable material selected from a mixture with a compound of; An organosilicon compound having an ethylenically unsaturated group or a fluorine compound having an ethylenically unsaturated group; And a curable composition comprising a photoinitiator. 10. The method of claim 2, 4 to 9, wherein the light collecting layer is at least one compound selected from urethane acrylate compound, styrene compound, butadiene compound and isoprene monomer, or bisphenol acrylate compound And at least one curable material selected from a mixture with at least one compound selected from fluorene acrylate compounds; An organosilicon compound having an ethylenically unsaturated group or a fluorine compound having an ethylenically unsaturated group; And a curable composition comprising a photoinitiator. The light collecting layer of any one of claims 3 and 10 to 15, wherein the light collecting layer is at least one compound selected from urethane acrylate compounds, styrene compounds, butadiene compounds, and isoprene monomers, or bisphenol acrylate compounds. And at least one curable material selected from a mixture with at least one compound selected from fluorene acrylate compounds; And a curable composition comprising a photoinitiator. The cured resin layer according to any one of claims 2 to 12, 14 and 15, further comprising a resin cured layer made of a curable resin containing an element having slip property in the molecular chain on the other side of the substrate layer. An optical sheet, characterized in that. The optical sheet according to claim 23, wherein the resin cured layer is formed from a curable composition comprising an organosilicon compound having an ethylenically unsaturated group or a fluorine compound having an ethylenically unsaturated group and a photoinitiator. The optical sheet according to claim 1, wherein the resin cured layer is formed from a curable composition having a viscosity of 25 to 100 cps. The optical sheet according to any one of claims 2 to 15, wherein the light collecting layer is formed from a curable composition having a viscosity of 100 to 5,000 cps when the viscosity is 25 ° C. The optical sheet according to claim 1, wherein the resin cured layer is formed from a curable composition having a glass transition temperature of 40 ° C or lower. The optical sheet according to any one of claims 2 to 15, wherein the light collecting layer is formed from a curable composition having a glass transition temperature of 40 ° C or lower. The optical sheet according to claim 27, wherein the resin cured layer is formed from a curable composition having a glass transition temperature of -15 to 25 ° C. The optical sheet according to claim 28, wherein the light collecting layer is formed from a curable composition having a glass transition temperature of -15 to 25 ° C. 16. The structure of any of claims 1 to 15, wherein the structured surface has a polyhedron shape that is polygonal, semicircular or semi-elliptical in cross section; Columnar shape having a polygonal, semi-circular or semi-elliptic cross section; And a curved columnar shape whose cross section is polygonal, semi-circular or semi-elliptical. The optical sheet according to any one of claims 1 to 15, wherein the structured surface is formed from a columnar pattern having a triangular cross section with a vertex angle of 90 °.

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