KR20170048621A - Compound Optical Sheet having a Variable Pitch - Google Patents

Compound Optical Sheet having a Variable Pitch Download PDF

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Publication number
KR20170048621A
KR20170048621A KR1020150146769A KR20150146769A KR20170048621A KR 20170048621 A KR20170048621 A KR 20170048621A KR 1020150146769 A KR1020150146769 A KR 1020150146769A KR 20150146769 A KR20150146769 A KR 20150146769A KR 20170048621 A KR20170048621 A KR 20170048621A
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KR
South Korea
Prior art keywords
base film
pattern layer
protrusions
projection
protrusion
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Application number
KR1020150146769A
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Korean (ko)
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KR101764104B1 (en
Inventor
김상근
박용완
명영길
이소래
이승윤
정지현
성태현
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주식회사 상보
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Priority to KR1020150146769A priority Critical patent/KR101764104B1/en
Publication of KR20170048621A publication Critical patent/KR20170048621A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing 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
    • G02B5/0231—Diffusing 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing 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
    • G02B5/0226—Diffusing 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 having particles on the surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer

Abstract

Disclosed is a composite optical sheet having a variable pitch. According to an embodiment of the present, the composite optical sheet having a variable pitch comprises: a first base film having a first pattern layer formed thereon; and a second base film formed on a lower surface of the first base film and having a second pattern layer formed on an upper surface thereof to be in contact with and supported by the first base film. The first pattern layer and the second pattern layer have a predetermined length, have a straight line-shape, and are formed in the same direction. As such, each pattern layer is processed in a concavo-convex shape on the first base film and the second base film having a double-layered structure such that a light diffusive effect can be obtained even without an optical diffusive layer containing a separate optical diffusive agent, thereby reducing the number of parts and allowing the thickness of an optical stacked film to be thinner.

Description

TECHNICAL FIELD [0001] The present invention relates to a compound optical sheet having a variable pitch,

The present invention relates to a composite optical sheet having a variable pitch, and more particularly, to a composite optical sheet having a variable pitch, which can reduce the overall thickness by stacking a plurality of prism sheets formed of a plurality of projections and grooves, And a composite optical sheet having a variable pitch for improving light diffusibility.

The structure of the backlight unit includes a reflective sheet, a light guide plate laminated on a reflective sheet, a diffusion sheet stacked on the light guide plate, a plurality of prism sheets stacked on the diffusion sheet, and a protective sheet that is finally stacked.

A prism sheet is a key component of an LCD-BLU, and refers to a brightness enhancement sheet having a function of improving brightness (brightness) of the display.

The light emitted from the light source passes through the light guide plate and the diffusion sheet, and the light luminance is rapidly decreased. The prism sheet is used to focus the light again to increase the light luminance.

A prism sheet is a strip type micro prism formed on top of a base material (PET). Most of the prism sheet is used as a set of horizontal and vertical two.

Finally, the light passing through the prism sheet is directed to the front surface with a viewing angle of about 70 degrees, and the brightness can also be improved.

Techniques for forming the surface of a prism sheet, i.e., optical articles with structured surfaces and methods of providing such optical articles are known.

For example, in U.S. Patent Nos. 6,096,247, 6,808,658, and 6,788,463.

The structured surfaces disclosed in these references include microprisms (such as microcubes) and lenses. Typically, these structures are produced on the surface of suitable polymers, for example by embossing, extrusion or machining.

A prism sheet is formed in a plurality of layers so as to improve the function of diffusing light and the light modulation property and the pitch of the protrusions formed on the surface of the prism sheet is different from each other, It is an object of the present invention to provide a composite optical sheet having a variable pitch.

1. The above object of the present invention is achieved by a light-emitting device comprising a base film having a light-transmitting property, and a pattern layer formed on an upper surface of the base film, wherein the pattern layer has a first projection, And a groove formed between the first projections and the second projections. The composite optical sheet according to claim 1,

2. The above-described object of the present invention is achieved by a method of manufacturing a liquid crystal display device, comprising: a first base film on which a first pattern layer is formed; And a second base film formed on a lower surface of the first base film and having a second pattern layer formed on an upper surface thereof and being contactably supported on a bottom surface of the first base film, Wherein the optical sheet is formed in a straight line shape having a predetermined length and formed in the same direction.

3. The above object of the present invention can be achieved by a method of manufacturing a semiconductor device, comprising: forming a first base film on which a first pattern layer is formed; A second base film formed on one side of the first base film and having a second pattern layer supported on the bottom surface of the first base film on an upper surface thereof; And a third base film formed on one side of the second base film and formed by mixing beads for dispersing light, wherein the second pattern layer is formed in the same direction as the first pattern layer, And the like.

The first pattern layer includes a plurality of protrusions and grooves formed between the protrusions and the protrusions.

The second pattern layer may include a first protrusion supported by the first base film, a second protrusion lower than the first protrusion, and a groove formed between the first protrusion and the second protrusion.

And the second protrusion of the second pattern layer is formed such that an upper end thereof is spaced apart from a lower portion of the first base film.

The protrusions of the first pattern layer may be triangular, semicircular, or trapezoidal in cross-sectional shape.

The first protrusions and the second protrusions of the second pattern layer may be triangular, semicircular, or trapezoidal in cross-sectional shape.

The first protrusion of the second pattern layer is formed with a flat flat portion at an upper end thereof so that the adhesive area can be enlarged.

And a plurality of fine protrusions are formed on the flat surface portion to improve the adhesive force.

According to an embodiment of the present invention, a prism sheet is formed in a plurality of layers so as to improve the function of diffusing light and optical modulation characteristics, and the pitch of the protrusions formed on the surface of the prism sheet is different, There is an effect that the composition can be improved.

1 is a sectional view showing a composite optical sheet having a variable pitch according to a first embodiment of the present invention,
2 is a perspective view showing a multilayer optical sheet assembly according to a second embodiment of the present invention,
3 and 4 are cross-sectional views showing embodiments of a 'first pattern layer' in a multilayer optical sheet assembly according to a second embodiment of the present invention,
5 and 6 are sectional views showing an embodiment of a 'second pattern layer' in a multilayer optical sheet assembly according to a second embodiment of the present invention,
7 is an enlarged cross-sectional view showing another embodiment of the 'second pattern layer' in the multilayer optical sheet assembly according to the second embodiment of the present invention,
8 is a cross-sectional photograph of an optical sheet assembly according to a second embodiment of the present invention,
9 is a perspective view showing an optical sheet assembly according to a third embodiment of the present invention,
10 is a sectional view showing an optical sheet assembly according to a third embodiment of the present invention.

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

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It does not mean anything.

In addition, the sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, and the terms defined specifically in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user, operator It should be noted that the definitions of these terms should be made on the basis of the contents throughout this specification.

[First Embodiment]

1, the composite optical sheet having a variable pitch according to the first embodiment of the present invention includes a base film 200 having a light-transmitting property, a pattern layer (not shown) formed on the top surface of the base film 200 The pattern layer 220 includes a first protrusion 221 and a second protrusion 222 having a height lower than that of the first protrusion 221. The first protrusion 221 and the second protrusion 221 And a groove 223 formed between the protrusions 222.

The base film 200 is a transparent film through which light can be transmitted and is generally formed of a material such as polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethyeleneterephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose triacetate ) And cellulose acetate propinonate (CAP), and it is particularly preferable that it is made of polyethylene terephthalate (PET).

The base film 200 should have good adhesion to the first pattern layer 110, transmittance of light incident from the rear surface should be 90% or more, and uniformity of the surface should be uniform so that there is no brightness variation.

The pattern layer 220 includes a first protrusion 221 having a longer height h2 and a second protrusion 222 having a lower height h1.

The first protrusion 221 and the second protrusion 222 may be triangular, semicircular, or trapezoidal in cross-sectional shape.

3 and 4, the first protrusion and the second protrusion may be formed of a semicircle 200-2, a trapezoid 200-3, a semicircle 200-2, a trapezoid 200-3, The first protrusions and the second protrusions are formed to have different heights to have a height.

Since the first protrusion 221 and the second protrusion 222 have a triangular cross-sectional shape, the apex angle? Is 30 to 40 占 and inclined surfaces are formed symmetrically on both sides.

Light passing through the base film 200 obliquely passes through the inclined surfaces of the first protrusion 221 and the second protrusion 222 and is emitted in a substantially vertical direction.

Or part of the light is circulated in the interior of the first protrusions 221 and the second protrusions 222 or between the slopes facing each other.

[Second Embodiment]

2 to 8, a composite optical sheet having a variable pitch according to a second embodiment of the present invention includes a first base film 100 on which a first pattern layer 110 is formed; A second pattern layer 220 formed on one side of the first base film 100 and supported on the upper surface of the first base film 100 in the same direction as the first pattern layer 110, And a second base film 200 formed thereon.

The first base film 100 and the second base film 200 are transparent films through which light can be transmitted and are generally made of polyethersulphone (PES), polyacrylate (PAR), polyether imide polyetherimide (PEI), polyethylenenaphthalate (PEN), polyethyeleneterephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, poly (PET), cellulose triacetate (TAC), and cellulose acetate propinonate (CAP), and it is particularly preferable that it is made of polyethylene terephthalate (PET).

The thickness of the first base film 100 is preferably 24 to 26 mu m. If the thickness of the first base film 100 is less than 24 占 퐉, the handleability in the manufacturing process is lowered. If the thickness of the first base film 100 is more than 26 占 퐉, the structure is contrary to the trend of thinning of the LCD module in recent years.

A UV adhesive 140 is applied to the lower surface of the first base film 100. The thickness of the UV adhesive 140 is preferably 2 to 4 mu m.

The thickness of the second base film 200 is preferably 48 to 52 탆. If the thickness of the first base film 100 is less than 48 mu m, the handling property of the first base film 100 is lowered. If the thickness of the first base film 100 is more than 52 mu m,

Meanwhile, the first pattern layer 110 and the second pattern layer 220 are formed on the first base film 100 and the second base film 200, respectively, and the first base film 100 and the second pattern layer 220 And serves to enhance the brightness of light by condensing the light passing through the base film 200.

Further, refraction, scattering or diffused reflection of light incident from a light guide plate (not shown) may occur, and light may be diffused.

The first pattern layer 110 and the second pattern layer 220 also prevent scratches.

The first pattern layer 110 and the second pattern layer 220 may be formed by a method such as sandblasting or photolithography.

The first pattern layer 110 and the second pattern layer 220 are formed in a straight line shape having a predetermined length and in the same direction.

The first pattern layer 110 and the second pattern layer 220 are processed into a plurality of protrusions and grooves formed between the protrusions and the protrusions.

Light may be emitted in a direction perpendicular to the LCD screen by the first pattern layer 110 and the second pattern layer 220.

The height of the protrusion 111 of the first pattern layer 110 is preferably 14 to 16 μm. At this time, if the height of the protrusion 111 is less than 14 mu m, the first pattern layer 110 has poor handleability in the manufacturing process. If the height exceeds 16 mu m, the structure of the first pattern layer 110 is contrary to the trend of thinning of the LCD module in recent years.

The protrusions 11 of the first pattern layer 110 may have a semi-circular shape 110-2 or a trapezoidal shape 110-3 as shown in FIGS. 3 and 4, in addition to the triangular shape in section.

The second pattern layer 220 includes a first protrusion 221 that is in contact with the first base film 100 and a second protrusion 222 that is lower in height than the first protrusion 221, And a groove 223 formed between the first protrusion 221 and the second protrusion 222.

Accordingly, as shown in FIG. 1, the second pattern layer 220 includes a first protrusion 221 having a long height and a second protrusion 222 having a short height. This is called 'variable pitch shape'.

Here, the tip of the first projection 221 is held in contact with the lower portion of the first base film 100.

At this time, the tip of the first protrusion 221 is adhered to the UV adhesive 240 applied on the lower surface of the first base film 100 with a certain portion being buried.

On the other hand, since the second protrusion 222 having a shorter pitch is spaced apart from the lower surface of the first base film 100, a space is formed between the second protrusion 222 and the lower surface of the first base film 100.

Therefore, when the first base film 100 and the second base film 200 are laminated and adhered to each other, the tip of the first protrusion 221 may be partially covered with the UV adhesive 140 The first base film 100 is lowered or lowered in a spaced space provided between the tip of the second projection 222 and the lower surface of the first base film 100. As a result, The thickness of the composite optical sheet having a variable pitch according to the embodiment of the present invention can be reduced.

Experimental results show that the comparative example has a thickness of 185 탆, whereas the multilayered seat assembly according to the embodiment of the present invention has a thickness of 175 탆, which makes the thickness thinner.

The first protrusions 221 and the second protrusions 222 of the second pattern layer 220 may have a triangular shape, a semicircular shape, or a trapezoidal shape in cross section.

2 and 3, the first protrusions and the second protrusions of the second pattern layer 220 may be formed of a semicircular pattern 200-2 and a trapezoid pattern 200-3, ), The first projection and the second projection, which are the trapezoids 200-3, are formed to have different heights to have a height.

As shown in FIG. 7, the first protrusion 221 of the second pattern layer 220 may have a planar flat portion 225 formed at the upper end thereof, thereby enlarging the bonding area.

Further, by forming a plurality of fine protrusions 227 in the flat surface portion 225, the adhesive force can be doubled.

Also, since the second pattern layer 220 is formed, an anti-blocking property is imparted. Blocking refers to a phenomenon in which the inner surfaces of the films tend to adhere to each other. Due to the second pattern layer 220 laminated on the upper surface of the second base film 200, blocking that sticks to the first base film 100 Can be prevented.

Blocking is not only an obstacle to work but also causes interference patterns.

Therefore, light can be diffused by the second pattern layer 220, and blocking can be prevented.

The second base film 200 is formed on the lower surface of the bead coating layer 500.

The bead coating layer 500 is composed of a binder resin and granular beads contained in the binder resin.

The binder resin is preferably made of any one of a UV curable epoxy binder and a UV curable binder including silicon. The binder resin is preferably composed of tris (2-acryloxyethyl) isocyanurate- 2-propenoic acid, (1-methylethylidene) bis (4,1-phenyleneoxy-2,1-ethane dioxy- More preferably a ternary copolymer of 1-phenyleneoxy-2,1-ethanediyloxy-2,1-ethanediyl ester and 1-hydroxy-cyclohexyl-phenyl ketone. The terpolymer may be a block copolymer or a random copolymer and has a glass transition temperature (Tg) of about 52 ° C and a number average molecular weight of about 4,500.

Preferably, the bead coating layer 500 is formed to a thickness of 2 to 4 mu m. At this time, if the thickness of the bead coating layer 500 is less than 2 m, the handling property in the manufacturing process is lowered. If the thickness is more than 4 m, the thickness of the bead coating layer 500 is contrary to the trend of thinning of the LCD module in recent years.

A process of transmitting light through a composite optical sheet having a variable pitch according to an embodiment of the present invention will now be described.

First, light emitted from a light source (not shown) and guided by a light guide plate (not shown) is incident on the second base film 200, and is primarily diffused by the bead coating layer 500.

Further, the light is rediffused by the beads contained in the bead coating layer 500 to form a uniform distribution, and the light passes through the second base film 200 and is condensed on the second pattern layer 220.

Since the first protrusions 221 and the second protrusions 222 of the second pattern layer 220 have a triangular cross-sectional shape, light passing through the second pattern layer 220 diagonally passes through the first protrusions 221 and the second protrusions 222 222 in a substantially vertical direction.

Or part of the light is circulated in the interior of the first protrusions 221 and the second protrusions 222 or between the slopes facing each other.

The light is incident on the first base film 100 in a state where the brightness is increased by the reflection mechanism in which the light is emitted.

Then, the light passes through the first base film 100 and is condensed on the first pattern layer 110.

Since the projection of the first pattern layer 110 has a triangular cross-sectional shape as described above, light passing through the second pattern layer 220 diagonally passes through the slope of the projection, and is emitted in a substantially vertical direction.

Or a part of the light is circulated while projecting light from the inside of the projections and the projections or between the slopes facing each other.

The light is emitted to the outside in a state in which the luminance is increased by the reflection mechanism in which the light is emitted.

The emitted light is incident on the LCD screen to illuminate the screen.

FIG. 8 shows an experimental result of the characteristics of the composite optical sheet having the variable pitch according to the second embodiment of the present invention.

8 is a tomographic photograph showing an embodiment of the present invention. Product name: TAF-L-PPD63.

The second pattern layer 220 is seen in the middle, and the composite optical sheet having a variable pitch according to an embodiment of the present invention has a thickness of 175 mu m and a luminous intensity of 101.00%.

Therefore, it was found that the thickness was thinner than that of the comparative example, but the brightness was increased.

[Third Embodiment]

9 and 10, an optical sheet assembly according to a third embodiment of the present invention includes a first base film 100 on which a first pattern layer 110 is formed; A second pattern layer 220 formed on one side of the first base film 100 and supported on the upper surface of the first base film 100 in the same direction as the first pattern layer 110, A second base film 200 formed; And a third base film 300 formed on one side of the second base film 200 and formed by mixing beads for dispersing light.

The first base film 100 and the second base film 200 are transparent films through which light can be transmitted and are generally made of polyethersulphone (PES), polyacrylate (PAR), polyether imide polyetherimide (PEI), polyethylenenaphthalate (PEN), polyethyeleneterephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, poly (PET), cellulose triacetate (TAC), and cellulose acetate propinonate (CAP), and it is particularly preferable that it is made of polyethylene terephthalate (PET).

The first base film 100 should have good adhesion with the first pattern layer 110, transmittance of light incident from the rear surface should be 90% or more, and uniformity of the surface should be uniform so that the brightness does not vary.

The thickness of the first base film 100 is preferably 24 to 26 mu m. If the thickness of the first base film 100 is less than 24 占 퐉, the handleability in the manufacturing process is lowered. If the thickness of the first base film 100 is more than 26 占 퐉, the structure is contrary to the trend of thinning of the LCD module in recent years.

A UV adhesive 140 is applied to the lower surface of the first base film 100. The thickness of the UV adhesive 140 is preferably 2 to 4 mu m.

The thickness of the second base film 200 is preferably 48 to 52 탆. If the thickness of the first base film 100 is less than 48 mu m, the handling property of the first base film 100 is lowered. If the thickness of the first base film 100 is more than 52 mu m,

Meanwhile, the first pattern layer 110 and the second pattern layer 220 are formed on the first base film 100 and the second base film 200, respectively, and the first base film 100 and the second pattern layer 220 And serves to enhance the brightness of light by condensing the light passing through the base film 200.

Further, refraction, scattering or diffused reflection of light incident from a light guide plate (not shown) may occur, and light may be diffused.

The first pattern layer 110 and the second pattern layer 220 also prevent scratches. The first pattern layer 110 and the second pattern layer 220 may be formed by a method such as sandblasting or photolithography.

The first pattern layer 110 and the second pattern layer 220 are processed into a plurality of protrusions and grooves formed between the protrusions and the protrusions.

Light may be emitted in a direction perpendicular to the LCD screen by the first pattern layer 110 and the second pattern layer 220.

The height of the protrusion 111 of the first pattern layer 110 is preferably 14 to 16 μm. At this time, if the height of the protrusion 111 is less than 14 mu m, the first pattern layer 110 has poor handleability in the manufacturing process. If the height exceeds 16 mu m, the structure of the first pattern layer 110 is contrary to the trend of thinning of the LCD module in recent years.

The protrusions 11 of the first pattern layer 110 may have a semi-circular shape 110-2 or a trapezoidal shape 110-3 as shown in FIGS. 3 and 4, in addition to the triangular shape in section.

The second pattern layer 220 includes a first protrusion 221 that is in contact with the first base film 100 and a second protrusion 222 that is lower in height than the first protrusion 221, And a groove 223 formed between the first protrusion 221 and the second protrusion 222.

Accordingly, as shown in FIG. 2, the second pattern layer 220 includes a first protrusion 221 having a long height and a second protrusion 222 having a low height. This is called 'variable pitch shape'.

The first protrusion 221 contacts the lower portion of the first base film 100 and is bonded to the UV adhesive 240 applied to the lower surface of the first base film 100. Whereas the second protrusion 222 is separated from the lower surface of the first base film 100.

When a space is formed between the second protrusions 222 and the lower surface of the first base film 100 and the first base film 100 and the second base film 200 are laminated and bonded together, 221 are inserted into the UV adhesive 140 applied to the lower surface of the first base film 100 and the lower surface of the first base film 100 is pressed by the pressure load, So that the thickness of the optical sheet assembly according to the embodiment of the present invention can be reduced.

As will be described later, the comparative example has a thickness of 185 mu m, while the multilayered mattress sheet assembly according to the embodiment of the present invention can be made slimmer with a thickness of 175 mu m.

The first protrusions 221 and the second protrusions 222 of the second pattern layer 220 may have a triangular shape, a semicircular shape, or a trapezoidal shape in cross section.

As shown in FIGS. 3 and 4, the first protrusions and the second protrusions of the second pattern layer 220 may be formed of a semicircular pattern 200-2 and a trapezoid pattern 200-3.

Alternatively, the first and second protrusions 200-2 and 200-3 may be formed to have different heights to have a height.

As shown in FIG. 7, the first protrusion 221 of the second pattern layer 220 may have a planar flat portion 225 formed at the upper end thereof, thereby enlarging the bonding area.

Further, by forming a plurality of fine protrusions 227 in the flat surface portion 225, the adhesive force can be doubled.

Also, since the second pattern layer 220 is formed, an anti-blocking property is imparted. Blocking refers to a phenomenon in which the inner surfaces of the films tend to adhere to each other. Due to the second pattern layer 220 laminated on the upper surface of the second base film 200, blocking that sticks to the first base film 100 Can be prevented.

Blocking is not only an obstacle to work but also causes interference patterns.

Therefore, light can be diffused by the second pattern layer 220, and blocking can be prevented.

The third base film 300 is a transparent film through which light can be transmitted. The third base film 300 includes a diffusion layer 320 made of polyethylene terephthalate (PET) and diffusing light before the light is introduced into the second base film 200, As shown in Fig.

The diffusion layer 320 includes a binder resin and a bead contained in the binder resin.

The binder resin is preferably made of any one of a UV curable epoxy binder and a UV curable binder including silicon. The binder resin is preferably composed of tris (2-acryloxyethyl) isocyanurate- 2-propenoic acid, (1-methylethylidene) bis (4,1-phenyleneoxy-2,1-ethane dioxy- More preferably a ternary copolymer of 1-phenyleneoxy-2,1-ethanediyloxy-2,1-ethanediyl ester and 1-hydroxy-cyclohexyl-phenyl ketone. The terpolymer may be a block copolymer or a random copolymer and has a glass transition temperature (Tg) of about 52 ° C and a number average molecular weight of about 4,500.

The beads are formed on the upper surface of the diffusion layer 320 to have a predetermined thickness and contact the lower surface of the second base film 200.

The third base film 300 is formed on the lower surface of the bead coating layer 340.

The bead coating layer 340 is composed of a binder resin and granular beads contained in the binder resin.

The binder resin is preferably made of any one of a UV curable epoxy binder and a UV curable binder including silicon. The binder resin is preferably composed of tris (2-acryloxyethyl) isocyanurate- 2-propenoic acid, (1-methylethylidene) bis (4,1-phenyleneoxy-2,1-ethane dioxy- More preferably a ternary copolymer of 1-phenyleneoxy-2,1-ethanediyloxy-2,1-ethanediyl ester and 1-hydroxy-cyclohexyl-phenyl ketone. The terpolymer may be a block copolymer or a random copolymer and has a glass transition temperature (Tg) of about 52 ° C and a number average molecular weight of about 4,500.

Preferably, the bead coating layer 340 is formed to a thickness of 2 to 4 탆. If the thickness of the bead coating layer 340 is less than 2 占 퐉, the handling property of the bead coating layer 340 is lowered. If the thickness of the bead coating layer 340 is more than 4 占 퐉,

A process of transmitting light through the optical sheet assembly according to the third embodiment of the present invention will now be described.

First, light emitted from a light source (not shown) and guided by a light guide plate (not shown) is incident on the third base film 300, and is diffused primarily by the bead coating layer 340 and the diffusion layer 320 do.

Further, light is rediffused by the beads contained in the bead coating layer 340 and the diffusion layer 320, and is incident on the second base film 200 with a uniform distribution.

Thereafter, the light passes through the second base film 200, is condensed on the second pattern layer 220, and is incident on the first base film 100 in a state where the brightness is increased.

Then, the light passes through the first base film 100, is condensed on the first pattern layer 110, and is emitted upward in a state where the brightness is increased.

The emitted light is incident on the LCD screen to illuminate the screen.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, It is obvious that the claims fall within the scope of the claims.

100: first base film 200: second base film
110: first pattern layer 111: projection
112: groove 220: second pattern layer
221: first projection 222: second projection
223: groove 320: diffusion layer
340: bead coating layer

Claims (27)

A base film having light transmittance,
And a pattern layer formed on an upper surface of the base film,
The pattern layer
A first projection, a second projection having a height lower than that of the first projection, and a groove formed between the first projection and the second projection. The method according to claim 1,
Wherein the first projections and the second projections have a cross-sectional shape selected from a triangle, a semicircle, and a trapezoid. The method according to claim 1,
Wherein the first projection is formed with a flat flat surface at an upper end thereof so that the adhesive area can be enlarged. The method of claim 3,
Wherein a plurality of fine protrusions are formed on the flat surface to improve the adhesive strength.
A first base film on which a first pattern layer is formed;
And a second base film formed on a lower surface of the first base film and having a second pattern layer supported on the upper surface of the first base film in contact with the bottom surface of the first base film,
Wherein the first pattern layer and the second pattern layer are formed in a straight line shape having a predetermined length and in the same direction. 6. The method of claim 5,
Wherein the first pattern layer comprises a plurality of protrusions and grooves formed between the plurality of protrusions and the protrusions. 6. The method of claim 5,
Wherein the second pattern layer comprises a first protrusion supported in contact with the first base film, a second protrusion lower in height than the first protrusion, and a groove formed between the first protrusion and the second protrusion. . 6. The method of claim 5,
The first pattern layer
And the height of the protrusions is 14 to 16 占 퐉. 6. The method of claim 5,
Wherein the first base film is made of a polyethylene phthalate material. 6. The method of claim 5,
And a UV adhesive is applied to a lower surface of the first base film. 6. The method of claim 5,
Wherein the first protrusions and the second protrusions of the second pattern layer have a triangular, semicircular, or trapezoidal cross-sectional shape. 12. The method of claim 11,
And the second projection of the second pattern layer is formed such that an upper end thereof is spaced apart from a lower portion of the first base film. 12. The method of claim 11,
Wherein the first protrusion of the second pattern layer has a planar flat portion formed at an upper end thereof so that the adhesive area can be enlarged. 14. The method of claim 13,
Wherein a plurality of fine protrusions are formed on the flat surface to improve the adhesive strength. 6. The method of claim 5,
And a bead coating layer is formed on a lower surface of the second base film. 16. The method of claim 15,
Wherein the bead coating layer comprises a binder resin and a bead contained in the binder resin.
A first base film on which a first pattern layer is formed;
A second base film formed on one side of the first base film and having a second pattern layer supported on the bottom surface of the first base film on an upper surface thereof;
And a third base film formed on one side of the second base film and formed by mixing beads for dispersing light,
Wherein the second pattern layer is formed in the same direction as the first pattern layer. 18. The method of claim 17,
Wherein the first pattern layer comprises a plurality of protrusions and grooves formed between the plurality of protrusions and the protrusions. 18. The method of claim 17,
Wherein the second pattern layer comprises a first projection which is held in contact with the first base film, a second projection which is lower in height than the first projection, and a groove which is formed between the first projection and the second projection. . 18. The method of claim 17,
Wherein the projection has a triangular, semicircular or trapezoidal cross-sectional shape. 18. The method of claim 17,
Wherein the first protrusions and the second protrusions of the second pattern layer have a triangular, semi-circular or trapezoidal cross-sectional shape. 22. The method of claim 21,
And the second projection of the second pattern layer is formed such that an upper end thereof is spaced apart from a lower portion of the first base film. 23. The method of claim 22,
Wherein the first protrusion of the second pattern layer is formed with a flat flat portion at an upper end thereof so that the adhesive area can be enlarged. 24. The method of claim 23,
Wherein a plurality of fine protrusions are formed on the flat portion to improve the adhesive force. 18. The method of claim 17,
The third base film
Wherein a diffusion layer for diffusing light before the light is introduced into the second base film is formed on one surface. 26. The method of claim 25,
Wherein the diffusion layer comprises a binder resin and a bead contained in the binder resin. 27. The method of claim 26,
Wherein the beads are formed as a layer having a predetermined thickness on the upper surface of the diffusion layer and contact the lower surface of the second base film.
KR1020150146769A 2015-10-21 2015-10-21 Compound Optical Sheet having a Variable Pitch KR101764104B1 (en)

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