KR20120012449A - Optical film having Anti-scratch chracteristics for enhanced brightness - Google Patents

Optical film having Anti-scratch chracteristics for enhanced brightness Download PDF

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KR20120012449A
KR20120012449A KR1020110112848A KR20110112848A KR20120012449A KR 20120012449 A KR20120012449 A KR 20120012449A KR 1020110112848 A KR1020110112848 A KR 1020110112848A KR 20110112848 A KR20110112848 A KR 20110112848A KR 20120012449 A KR20120012449 A KR 20120012449A
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KR
South Korea
Prior art keywords
optical film
base layer
light
scratch
methacrylate
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KR1020110112848A
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Korean (ko)
Inventor
구자정
김진수
김태진
성명석
유상현
지성대
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웅진케미칼 주식회사
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Priority to KR1020110112848A priority Critical patent/KR20120012449A/en
Publication of KR20120012449A publication Critical patent/KR20120012449A/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0205Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0205Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/04Prisms
    • G02B5/045Prism arrays
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/584Scratch resistance
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504Diffusing, scattering, diffracting elements
    • G02F2001/133507Luminance enhancement films

Abstract

PURPOSE: An optical film having anti-scratch characteristics for enhanced brightness is provided to improve condensing and scratch resistance. CONSTITUTION: A scratch resistance optical film having improved brightness is comprised of a base layer(110) and a lens shape(130). A concentration pattern is formed in the top side of the base layer. The bottom of the base layer is formed into a lens shape of which a part is flat. The diameter of the lens shape is between 50 and 120um and the ratio of the height and diameter is 2:0.5 or 2 : 0.8.

Description

Optical film having Anti-scratch chracteristics for enhanced brightness}

The present invention relates to a scratch-resistant brightness enhancement optical film, and more particularly to a brightness enhancement optical film formed by applying a pattern to the optical film for the backlight unit.

Recently, various flat panel display devices have been developed. These flat panel display devices include liquid crystal displays (LCDs), plasma display panels (PDPs), and field emission displays (FEDs). In addition, studies are being actively conducted to improve the display quality of such flat panel displays.

Among them, LCD is a device that injects liquid crystal between two sheets of glass and applies power to the electrodes installed on the upper and lower glass plates to change the arrangement of liquid crystal molecules and display images in each pixel. Such an LCD display device generally comprises an LCD panel unit, a driving unit, and a backlight unit. The LCD panel does not emit light by itself and has only a function of transmitting light on the rear surface. Therefore, in the absence of light, that is, at night or indoors, it is a structure that can not display images without the help of backlight. The backlight unit refers to a system for implementing the backlight of such an LCD.

The backlight unit is largely composed of a lamp, sheets, a mechanism part, and a driving circuit. Since the lamp alone cannot produce uniform light over the entire area, the light guide plate, diffuser plate, reflector plate, prism, frame, etc., sheets and mechanisms are provided.

There are various methods for the backlight unit, and the most widely used method is a cold cathode fluorescent lamp (CCFT) having a light guiding plate (LGP) printed with a reflection pattern in the center by side light method. The cold cathode fluorescent lamp is placed on the edge. At this time, the reflective pattern printed on the light guide plate is printed in a structure to reduce the phenomenon that the brightness difference occurs depending on the position of the lamp is located at the edge of the panel. Although the method of printing the reflective pattern on the light guide plate is high in productivity, the light loss caused by the printing pattern material itself is inferior in efficiency, and the larger the LCD, the worse the uniformity of the overall brightness.

Since the light guide plate method does not provide sufficient brightness, a direct method in which a plurality of lamps are arranged at regular intervals under the diffuser plate is used. In this method, several fluorescent lamps are arranged in a row on the rear surface of the diffusion sheet to improve luminance and improve uniformity than the photometric type. In order to display a bright screen, the backlight light source must be very bright. This is because the light from the light source goes through several steps before reaching the LCD, and loses its original brightness in the process. In addition, the uniformity of light throughout the screen is lost because of the scattering effect.

One way to overcome this problem is to increase the size of the light source, but this is expensive installation cost, high power consumption, and also has a problem of increasing the weight a lot. Thus, several attempts have been made to improve the light source brightness without loss as much as possible during the transmission process.

In flat panel display devices such as LCDs and projection TVs, a diffuser is an optical element that plays an important role in reaching light from the light source to the viewer's eyes. The diffuser plate uniformly distributes the light from the light source and plays an important role in the direct type than in the case of LCD. Structural metering is a structure where light guided by a light guide can be uniformly distributed throughout the screen, but in the case of a direct type, several light sources are distributed below the screen, so that the point just above the light source and the point between the light source and the light source Because there is a difference in the light intensity, you have to offset it.

The most important optical properties of the optical film used to improve visibility in the backlight unit are light transmittance and haze, which require a total amount of light of 60% or more and 85% or more of light for visible light. In order to satisfy these characteristics, a light diffusion film generally includes a surface diffusion method of refraction or dispersion in a number of directions using surface roughness and a bulk diffusion film method having an inherent light dispersion element.

The surface diffusion type diffusion film uses a rough surface exposed to air to maximize the difference in refractive index between the material of the diffusion film and the surrounding medium as much as possible to spread the incident light at the largest angle. For example, light diffusivity is imparted by forming irregularities on the film surface. There is a light diffusing film in which the unevenness is formed on the surface of the transparent resin made of a polyester resin, a polymethyl methacrylate resin or a polycarbonate resin. However, it is difficult to simultaneously obtain excellent light transmittance and light diffusivity only by imparting irregularities to the surface by embossing or sand blasting. In addition, the temperature in the backlight unit generally rises from 80 ° C to 90 ° C, and when the humidity is high, shape deformation may occur severely, so that a material having excellent optical properties while having high heat resistance and low moisture absorption rate is used.

The bulk diffusion film is a light diffusing agent such as fine particles dispersed within the film, and is usually made of a transparent resin made of a resin such as polymethyl methacrylate, polycarbonate, etc., calcium carbonate, titanium dioxide, glass beads, silica particles, polystyrene There are light diffusing films in which particles, silicone resin particles, crosslinked polymer particles and the like are dispersed.

Korean Unexamined Patent Publication No. 2007-0078293 discloses a light collecting member, a method of manufacturing the same, and a display device having the same. The light collecting member includes a base layer, a light collecting layer, and a lower surface treatment layer. The light collecting layer is formed on the upper surface of the base layer and has a light collecting pattern. The lower surface treatment layer is formed on the lower surface of the base layer and consists of round protrusions. The protrusion has a height-to-width ratio in the range of about 0.01 to 0.06, which reduces manufacturing costs by using only one light collecting member, and improves display quality by preventing scratches and adhesion with the diffuser plate. There is an advantage. However, the patent has an advantage that the scratch resistance is improved, but there is a problem that the brightness is lowered.

Due to the problems described above, the development of an optical film that can improve the luminance and at the same time have excellent scratch resistance.

In order to solve the above problems, an object of the present invention is to provide an optical film having high scratching effect and excellent scratch resistance in performing a role as an optical film.

Another object of the present invention is to provide an optical film having excellent scratch resistance and improved physical properties as an optical film such as haze.

The present invention to achieve the above object is a base layer; An upper surface of the base layer may include a light condensing pattern giving condensing property; And a lower surface of the base layer is formed in a lens shape, and a part of the curved surface of the lens shape is formed as a flat surface, and the diameter of the lens shape is 50 to 120 μm, and the ratio of diameter and height is 2: 0.5 to 2: 0.8. It provides a scratch resistance luminance improvement optical film characterized in that.

In another aspect, the present invention provides a scratch-resistant luminance improvement optical film, characterized in that the flat surface is parallel to the base layer.

In another aspect, the present invention provides a scratch resistance luminance improvement optical film, characterized in that the light collecting pattern is a prism pattern.

In another aspect, the present invention provides a scratch-resistant luminance improvement optical film, characterized in that the pitch of the prism is 60 to 200㎛ and 50 to 150㎛ height.

In another aspect, the present invention provides a scratch-resistant luminance improvement optical film, characterized in that the interval of the lens shape is 200 to 800㎛.

In the present invention, the base layer is methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydride Monomer selected from oxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, metalolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate and 2-ethylhexyl acrylate Scratch-resistant luminance-improving optics further comprising one or more selected light diffusing particles consisting of beads and silicone-based spherical particles made of homopolymers, copolymers or terpolymers, polyethylene, polystyrene, polypropylene, acrylic and olefin copolymers Provide a film.

The optical film according to the present invention has an effect of excellent scratch resistance while having a high light condensing effect.

In addition, the optical film according to the present invention has an effect of providing an optical film having excellent scratch resistance while improving physical properties as an optical film such as haze.

1 shows a perspective view of an optical film according to an embodiment of the present invention.
2 shows a cross-sectional view of an optical film according to an embodiment of the present invention.
3 shows a schematic view of a lens shape according to an embodiment of the present invention.
Figure 4 shows a schematic view of the manufacturing process of the optical film according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms " about ", " substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation to or in the numerical value of the manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

As used herein, the term "film" is used to mean both films, sheets, and plates having a predetermined width and thickness.

The present invention relates to an scratch-resistant luminance-enhanced optical film comprising: a base layer; An upper surface of the base layer may include a light condensing pattern giving condensing property; And a lower surface of the base layer is formed in a lens shape, and the lower surface of the lens shape is formed in a flat surface.

1 and 2 show a perspective view and a cross-sectional view of an optical film according to an embodiment of the present invention.

1 and 2, the present invention is formed on the upper surface of the film consisting of a light collecting pattern for condensing the light to improve the brightness, the base layer 110 is formed of a lens shape 130 for scratch resistance, The lower curved surface of the lens shape 130 is characterized by consisting of a flat surface.

The optical film including the base layer 110 is preferably formed of the same transparent resin material, the optical film is preferably made of PET or PC. In addition, the thickness of the base layer 110 is preferably 150 to 800㎛.

An upper surface of the base layer 110 has a condensing pattern for condensing the transmitted light, and the condensing pattern is formed on the upper part of the base layer 110, and condenses the advancing direction of light to improve luminance.

The condensing pattern serves to condense or reflect the incoming light, and the light condensed by the condensing pattern moves in the direction of the liquid crystal display panel, and the reflected light is reflected back through a reflecting sheet and the like.

 The light converging pattern may be formed of a plurality of prisms 120 connected to each other. In addition, the laminated structure between the optical films is preferably such that the air layer is formed between them, in the case of the optical film of the present invention serves as an air layer formed between the prism 120. For this purpose, the pitch of the prism 120 (distance between vertices and vertices) may be 60 to 200 µm and the height (vertical distance between vertices and base) may be 50 to 150 µm. The above range is for securing an air layer reflecting refraction by performing an optical function as a prism to improve luminance.

The lower surface of the base layer 110 is formed of a lens shape 130, it is preferable that the lower surface of the lens shape is formed as a flat surface.

Figure 3 shows a flat surface portion of the curved portion of the lens shape in one embodiment of the present invention.

Lens shapes formed on the bottom surface of the base layer 110 are to prevent scratches that may occur due to external impact. It is preferable that the optical film according to the present invention is formed to be able to improve the luminance by minimizing the loss of incident light while improving the adhesion with the film laminated on the lower portion of the base layer 110 and the scratch.

To this end, a portion of the curved surface of the lens as shown in FIG. 3 is formed to be a flat surface 131. Since a part of the curved surface is formed as the flat surface 131, the luminance of incident light may be minimized to prevent the luminance from falling. When the bottom surface of the base layer 110 is provided with a roughness to prevent scratches or simply formed in the shape of a lens, a distortion phenomenon occurs in which light is diffused upon incidence.

However, in the present invention, a lens shape 130 is formed on the bottom surface of the base layer 110, and a part of the lens shape 130 forms a flat surface 131, thereby preventing scratches and minimizing light distortion.

The flat surface is preferably made in parallel with the base layer 110. Since the flat surface is made flat with the base layer 110, it may be excellent in adhesion with other films laminated while minimizing distortion at the time of incidence of light.

The diameter of the lens shape is preferably 50 to 120㎛, the ratio of the diameter and height is preferably 2: 0.5 to 2: 0.8. When the diameter and height ratio are within the above ranges, the distortion of light is minimized and condensing is well performed in the condensing pattern.

On the other hand, the optical film may further include light diffusing particles for the diffusion effect, since the light diffusing particles should be compatible with the binder (resin) containing the particles, because the organic particles and similar refractive index having a low refractive index and the material The silicon particles in the form were examined and used, and inorganic particles having a refractive index of 1.50-1.80 can be used. Particularly, the particle selection to be used is advantageous for solving the problem such as showing the bright line due to the spherical particles having the refractive index difference of 0.1 to 0.2 from the material to improve the shielding, and to maximize the diffusion effect with a relatively small particle amount. It is very advantageous.

The refractive index of the diffusing agent particles used increases the light diffusing effect as the difference between the material and the refractive index is larger, but when the refractive index difference is too large, it is disadvantageous in terms of increasing the brightness, so that an appropriate refractive index difference is obtained and sometimes similar to the material. It is preferable to use the particle | grains with a big difference.

Non-limiting examples of light diffusing particles that can be used in the present invention include methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, Hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, metalolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate and 2 Homopolymers, copolymers or terpolymers of monomers selected from ethylhexyl acrylate, beads made from copolymers of polyethylene, polystyrene, polypropylene, acrylics and olefins, and silicone-based spherical particles may be used. Preferably, the material is spherical particles between 1 μm and 10 μm having a refractive index difference of about 0.1 to about 0.2. Spherical organic particles having such a difference in refractive index can be easily dispersed in the resin because they have densities similar to those of the material used in the present invention (about 1.10 to 1.30 g / cm 3).

The light diffusing particles used in the present invention may use different ones in type and / or size. For example, light diffusion efficiency can be improved by using two or more kinds of particles having a difference in refractive index rather than a single type. In addition, light diffusing efficiency may be increased by using particles having similar refractive indices and different sizes, and by applying porous particles, the brightness may be increased while maximizing light diffusing efficiency after assembling the backlight unit.

Using particles of uniform particle size requires a large amount of particles to produce a predetermined light diffusing effect, which results in not only economic inefficiency, but also lowering the overall light transmittance. According to one embodiment of the present invention, the size of the light diffusing particles can be used to increase the light diffusion effect while reducing the particle content by using two kinds of particles having a size of 20 to 30 ㎛ and 1 to 15 ㎛.

The light diffusing particles may be used at 0.5 to 20% by weight, preferably 1 to 10% by weight based on the total weight of the optical film. When the light diffusing particles are 0.5 wt% or less, a predetermined light diffusing effect cannot be obtained, and when the light diffusing particles is more than 20 wt%, the light transmittance is lowered, and the dispersibility of the particles is reduced and uniform. Particle dispersion cannot be obtained.

Figure 4 shows a manufacturing process of the optical film by the melt extrusion extrusion method according to an embodiment of the present invention.

Unlike the conventional method, the optical film manufacturing method of the present invention does not require a separate coating apparatus, a press apparatus, and a curing apparatus, and can be simply formed on a pattern roll to form a shape.

The present invention provides a scratch-resistant luminance-enhanced optical film of the melt extrusion stamping method, referring to Figure 4, by extruding the molten resin consisting of PET or PC in the T-die 210.

In the first pattern roll 220, the first engraving pattern 221 forms a condensing pattern on the upper surface of the base layer 110. The shape of the first engraving pattern 221 is such that a condensing pattern such as a prism is formed on the upper surface of the base layer 110. Adjust

In addition, in the second pattern roll 230, the second engraving pattern 231 has a shape that can impart a lens shape 130 to the lower surface of the base layer 110. Adjust pattern 231.

As the molten resin made of PET or PC is extruded through the T-die, it passes between the first pattern roll 220 and the second pattern roll 230 to impart a prism shape 110 through the first engraving pattern 221 of the first pattern roll 220. The lens shape 130 of the lower surface of the base layer 110 is provided through the second engraving pattern 231 of the second pattern roll 230.

Thereafter, the optical film is cooled between the first pattern roll 220 and the roller 240, and is cooled between the first pattern roll 220 and the roller 240 (area B). To this end, by forming a quenching condition in the B region to drastically lower the surface temperature of the film, by minimizing the change in the shape of the polymer chain by limiting the flow of the polymer chain due to residual stress as the film is cured.

Specifically, a cooling means such as an air knife may be further provided on the surface of the film on which the engraved shape is implemented, thereby fixing the shape expressed on the film. At this time, the cooling temperature is preferably 4 to 20 ℃, more preferably 4 to 10 ℃.

Hereinafter, embodiments of the present invention will be described in detail.

Example  One

PET was melt-extruded through a T-die, and the thickness of the base layer was 300 μm, and the pitch of the prism pattern was 150 μm, the height was 80 μm, and the bottom surface of the base layer was provided with a lens shape. The optical film was manufactured by adjusting the first and second engraving patterns to form a flat surface having a diameter of 80 µm and a height of 32 µm.

Example  2

In the same manner as in Example 1, the lens shape is 80㎛, the height is 20㎛ to prepare an optical film by adjusting the first phosphor pattern, the second phosphor pattern to form a flat surface.

Example  3

PET was melt-extruded through a T-die as a polymer resin, and the base layer had a thickness of 400 μm, and the upper surface of the base layer had a pitch of 120 μm, a height of 70 μm, and a bottom surface of the base layer having a lens shape with a diameter of 60 μm. The optical film was manufactured by adjusting the first phosphor pattern and the second phosphor pattern so that a flat surface was formed with a thickness of 24 μm.

Example  4

Example 3 was carried out in the same manner, but the optical film was prepared by adjusting the first phosphor pattern and the second phosphor pattern to form a flat surface having a diameter of 60 μm and a height of 15 μm.

Example  5 and 6

Example 1 and 2 were carried out in the same manner, but blended by mixing 1 part by weight of ethyl methacrylate as a light diffusing agent to 100 parts by weight of the resin of the base layer in the base layer to prepare an optical film.

Comparative example  1 and 2

An optical film was prepared in the same manner as in Example 1 and Example 3, but having a lens-shaped diameter of 80 μm without the formation of a flat surface on the bottom surface of the base layer.

Comparative example  3 and 4

In the same manner as in Example 1 and Example 3, the lower surface of the base layer was provided without roughening the lens shape, but roughness was given. The roughness was sanded so that the Rz value was 6 µm and the average Ra value was 1.0 µm. An optical film was manufactured by operating a sanding) operation and a second pattern roll.

* Test Methods

1. Transmittance (TT) and haze (Haze): Measured by ASTM D1003 method using NIPPON DENSHOKU 300A analyzer.

2. Luminance: Measured on a stage equipped with a film produced in the backlight unit, TOPCON BM-7 with CCFL voltage of 16.5V, Dimming value 2.8V.

Table 1 shows the results of testing optical characteristics such as transmittance for each of Examples and Comparative Examples.

division Transmittance (%) Haze (%) Brightness (cd / m 2) Example 1 68 91.2 10150 Example 2 67 91.0 10130 Example 3 65 91.2 10100 Example 4 66 91.4 10080 Example 5 63 91.8 10070 Example 6 64 91.7 10040 Comparative Example 1 61 91.8 9880 Comparative Example 2 62 91.7 9910 Comparative Example 3 62 92.1 9640 Comparative Example 4 63 91.8 9610

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

Claims (6)

  1. Base layer;
    An upper surface of the base layer may include a light condensing pattern giving condensing property; And
    The lower surface of the base layer is made of a lens shape, the curved portion of the lens shape is formed as a flat surface,
    The diameter of the lens shape is 50 to 120㎛, the scratch-resistant brightness improvement optical film, characterized in that the ratio of the diameter and height is 2: 0.5 to 2: 0.8.
  2. The method of claim 1,
    The flat surface is scratch-resistant luminance improvement optical film, characterized in that parallel to the base layer.
  3. The method according to claim 1 or 2,
    The light collecting pattern is scratch resistant luminance improvement optical film, characterized in that the prism pattern.
  4. The method of claim 3,
    The scratch-resistant optical film, characterized in that the pitch of the prism is 60 to 200㎛ and 50 to 150㎛ height.
  5. The method according to claim 1 or 2,
    The scratch-resistant optical film, characterized in that the interval of the lens shape is 200 to 800㎛.
  6. The method according to claim 1 or 2,
    The base layer is methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate Homopolymers of monomers selected from latex, hydroxyethyl acrylate, acrylamide, metarollacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate and 2-ethylhexyl acrylate, The scratch resistant luminance-enhanced optical film further comprising at least one light diffusing particle made of a copolymer or a terpolymer, polyethylene, polystyrene, polypropylene, acrylic and olefin-based copolymers and silicon-based spherical particles.
KR1020110112848A 2011-11-01 2011-11-01 Optical film having Anti-scratch chracteristics for enhanced brightness KR20120012449A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9594190B2 (en) 2012-11-29 2017-03-14 Samsung Display Co., Ltd. Anti-scratch film for flexible display

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9594190B2 (en) 2012-11-29 2017-03-14 Samsung Display Co., Ltd. Anti-scratch film for flexible display
US10371869B2 (en) 2012-11-29 2019-08-06 Samsung Display Co., Ltd. Anti-scratch film for flexible display

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