KR101767137B1 - Composition optical sheet including function of diffusion plate integrated light diffusion means - Google Patents

Composition optical sheet including function of diffusion plate integrated light diffusion means Download PDF

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Publication number
KR101767137B1
KR101767137B1 KR1020150172445A KR20150172445A KR101767137B1 KR 101767137 B1 KR101767137 B1 KR 101767137B1 KR 1020150172445 A KR1020150172445 A KR 1020150172445A KR 20150172445 A KR20150172445 A KR 20150172445A KR 101767137 B1 KR101767137 B1 KR 101767137B1
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South Korea
Prior art keywords
pattern
layer
prism
base layer
diffusion
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KR1020150172445A
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Korean (ko)
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KR20170065988A (en
Inventor
노성우
김규동
배경수
박성진
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글로텍 주식회사
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Priority to KR1020150172445A priority Critical patent/KR101767137B1/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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • G02B5/0215—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 a regular structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter

Abstract

The present invention relates to a composite optical sheet having a diffusion plate function in which diffusion means is integrated, and more particularly, to a composite optical sheet including a diffusing plate function integrated with diffusion means, ≪ / RTI >
Further, by providing the integrated composite optical sheet, it is possible to increase the process efficiency, to reduce the manufacturing cost, to obtain the economical effect by shortening the manufacturing time, and to increase the rigidity and durability of the entire sheet.

Description

TECHNICAL FIELD [0001] The present invention relates to a composite optical sheet having a diffuser plate function integrated with a diffusing means,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite optical sheet, and more particularly, to a composite optical sheet having a diffusion plate function in which diffusion means is integrated.

2. Description of the Related Art Flat panel display devices (FPDs) having the advantages of thinning, light weight, and low power consumption in the display field, which has recently developed rapidly, are excellent in moving picture display and have a high contrast ratio, A liquid crystal display device (LCD), which is most actively used in the fields of liquid crystal display (LCD), monitor, and TV, is being rapidly spotlighted as a substitute for a cathode ray tube (CRT).

Such a liquid crystal display (LCD) is advantageous in that the alignment direction of molecules is changed when a voltage is applied to the liquid crystal and the light passes or is reflected. The thickness is thinner and power consumption is lower than other display devices. Such a liquid crystal display device displays a screen through a liquid crystal panel containing a liquid crystal between glass substrates. Since the liquid crystal itself is not a self-luminous element but a light-receiving element that can not generate light itself, A backlight unit for supplying light to the backlight unit is required.

The backlight unit includes a direct-lighting type in which light from a light source is dispersed in a rear portion of the liquid crystal panel, and an edge-lighting type in which light from the light source is incident on the liquid crystal panel. .

BACKGROUND ART Generally, a backlight unit is provided on the back surface of a liquid crystal panel. The backlight unit includes an optical sheet including a light source, a light guide plate, a diffusion sheet, and a prism sheet. Further, a diffusion plate may be further provided between the light source and the diffusion sheet, and in this case, the thickness of the optical sheet becomes thicker.

As described above, the optical sheet is composed of a diffusion sheet and a prism sheet. In this case, the prism sheet for condensing can be used as a single sheet, but multiple prism sheets can be stacked in order to realize high brightness. However, if the number of sheets stacked in this way increases, the time and cost of the work process in the manufacturing process increases, which causes problems in terms of process efficiency and economy.

Further, if each sheet in the optical sheet is deformed by one sheet in accordance with environmental changes such as heat and humidity, a problem may arise in image display. In order to prevent such a problem, in some conventional apparatuses, efforts have been made to increase the thickness of each sheet to minimize deformation. However, in view of the recent trend of thinning and weight reduction of the liquid crystal display device, It is absent.

Korean Patent Laid-Open Publication No. 2014-0093096 filed by the present applicant discloses a composite optical sheet in which two light-condensing layers are integrated on a diffusion layer, but a diffusion plate is still required in application to a direct-type backlight unit, There has been a problem such that the interlayer bonding is performed only by the adhesive force of the spacer or the prism or by a separate adhesive layer and the condensing efficiency is lowered due to the weak adhesive force or the thick adhesive layer.

Korean Patent Publication No. 2014-0093096 (published on July 25, 2014)

Accordingly, development of a backlight unit optical sheet in a liquid crystal display device has been urgently required for a thin and lightweight liquid crystal display device in accordance with trends in the display field.

Further, in view of process efficiency and economical efficiency, it is necessary to develop a composite optical sheet in which several sheets are integrated so as to simplify the manufacturing process and reduce the manufacturing cost.

Further, it is necessary to minimize the deformation of the sheet, while being a composite optical sheet that is a thin and lightweight integral body.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite optical sheet having a diffusion plate function in which diffusion means is integrated.

Further, it is an object of the present invention to provide a composite optical sheet of a thin and lightweight by integrating various functional sheets including diffusion means among the above services.

Another object of the present invention is to integrate each sheet to further simplify the manufacturing process to increase the efficiency and reduce the manufacturing cost, thereby obtaining economical effects.

It is also an object of the present invention to prevent the respective sheets from being deformed due to environmental factors by providing an integrated composite optical sheet.

In order to achieve the above-mentioned object,

A first base layer of a resin material; a first diffusion pattern type resin containing a resin containing or not including a bead or a filler on the lower surface of the first base layer; and a plurality of A first layer comprising an open pillar-shaped spacer and a second diffusion pattern formed between the spacers, the spacer surface, or between the spacers and on the spacer surface;

A second base layer made of a resin material adhered to the top of the first layer through a second adhesive layer and a first prism pattern continuously formed on the top surface of the second base layer, A second layer in which the resin at the top of the spacer and the resin of the second adhesive layer polymerize with each other to form a polymer;

A third base layer made of a resin material adhered to the second layer through a first prism pattern ridge and a third adhesive layer and a second prism pattern formed continuously on the upper surface of the third base layer, A third layer in which the resin of the first prism pattern top portion of the second layer and the resin of the third adhesive layer polymerize with each other to form a polymer; And

A fourth base layer made of a resin material adhered via a second prism pattern ridge of the third layer and a fourth adhesive layer and a fourth base layer made of a resin material such as a lens pattern, And a fourth layer including a pattern and a third diffusion pattern, wherein the resin of the second prism pattern-like resin of the third layer and the resin of the fourth adhesive layer polymerize with each other to form a polymer, Containing composite optical sheet according to the present invention.

The composite optical sheet with a diffusing plate function of the present invention is characterized in that the first diffusing pattern surface of the first layer, the first prism pattern surface or the second adhesive layer surface of the second layer, the second prism pattern type Or a fourth diffusion at one or more surfaces selected from the surface of the third adhesive layer, the lens pattern of the fourth layer, the third diffusion pattern, the lens pattern and the third diffusion pattern or the surface of the fourth adhesive layer, It may further include a pattern type.

The first diffusion pattern, the spacer, the second diffusion pattern, the second adhesive layer, the first prism pattern, the third adhesive layer, the second prism pattern, the fourth adhesive layer, the lens pattern, And the fourth diffused pattern type may include a thermosetting or active energy ray-curable resin as a main component.

In addition, the active energy ray may be ultraviolet ray.

The resins of the first base layer, the second base layer, the third base layer and the fourth base layer may be polyethylene terephthalate or polycarbonate.

The arithmetic mean surface roughness of the first diffusion pattern may be 0.5 to 3.5 mu m, preferably 0.6 to 3 mu m, more preferably 0.8 to 2.5 mu m, even more preferably 1 to 2 mu m.

In addition, the spacer may be selected from the group consisting of polygonal, semicircular, arcuate, partial arcuate, and combinations thereof, the cross section perpendicular to the column direction.

The second diffusion pattern, the third diffusion pattern and the fourth diffusion pattern have an average particle diameter of 1 to 70 mu m, preferably 2 to 60 mu m, more preferably 5 to 50 mu m, In the group consisting of diffusion protrusions of 10 to 40 占 퐉, hemispheres having an average diameter of 10 to 100 占 퐉, preferably 15 to 80 占 퐉, more preferably 20 to 70 占 퐉, still more preferably 30 to 60 占 퐉, and combinations thereof Can be selected.

The diffusion protrusions may be selected from the group consisting of polygonal, circular, semicircular, arcuate, partial arc, and combinations thereof.

In addition, the hemispheres may be arranged in hexagonal or tetragonal form.

The area occupied by the spacer in the first base layer is 3 to 50%, preferably 4 to 45%, more preferably 5 to 40%, still more preferably 5 to 35% Lt; / RTI >

The ratio of the area of adhesion of the spacer to the second adhesive layer with respect to the area of the first base layer is 3 to 50%, preferably 4 to 45%, more preferably 5 to 40% And preferably from 5 to 35%.

The columnar spacers may be parallel to each other or may not be parallel to each other.

The height of the columnar spacers may be equal to or different from each other.

It is preferable that the ratio of the area of adhesion of the prism to the third adhesive layer with respect to the bottom surface of one prism of the first prism pattern and the ratio of the area of the bottom surface of one prism of the second prism- The ratio of the area of the contact area to be contacted or the ratio of the area of adhesion of the prism to the third adhesive layer with respect to the bottom area of one prism of the first prism pattern and the bottom area of one of the second prism pattern, The ratio of the bonding area in contact with the fourth adhesive layer may be 3 to 15%, preferably 4 to 14%, more preferably 5 to 13%, even more preferably 6 to 12%.

In addition, the first prism pattern, the second prism pattern, or the first prism pattern and the second prism pattern continuously arranged may not be parallel or parallel to each other.

The heights of the pattern shapes selected from the group consisting of the first prism pattern shape, the second prism pattern shape, the second diffusion pattern shape, the third diffusion pattern shape, the lens pattern shape, and the combination thereof may be the same or different from each other .

The diffusive plate-function composite optical sheet of the present invention is characterized in that the ridge of the first prism pattern in the direction perpendicular to the plane formed by the second base layer, the ridge of the first prism pattern in the direction perpendicular to the plane formed by the third base layer The ridge of the second prism pattern ridge or the ridge of the first prism pattern in the direction perpendicular to the plane formed by the second base layer and the ridge of the second prism pattern ridge in the direction perpendicular to the plane formed by the third base layer, The prism-patterned ridgeline may be a straight line, a curved line, or a wavy line.

The first prism pattern ridge parallel to the plane formed by the second base layer and perpendicular to the first prism pattern direction is parallel to the plane defined by the third base layer, The second prism pattern-like ridgeline in a direction perpendicular to the pattern-like direction, or the ridge of the first prism pattern-like shape parallel to the plane formed by the second base layer and perpendicular to the first prism- The ridge of the second prism pattern in a direction parallel to the ridge line and the plane formed by the third base layer and perpendicular to the second prism pattern direction may be a straight line, a curved line, or a wavy line.

The beads on the lower surface of the first base layer may be transparent particles having an average particle size of 1 to 15 mu m, preferably 2 to 14 mu m, more preferably 3 to 13 mu m, even more preferably 4 to 12 mu m .

The filler on the lower surface of the first base layer may be an inorganic particle having an average particle diameter of 0.1 to 3 占 퐉, preferably 0.2 to 2.5 占 퐉, more preferably 0.3 to 2 占 퐉, still more preferably 0.4 to 1.5 占 퐉 .

The inorganic particles may be selected from the group consisting of TiO 2 , SiO 2 , CaCO 3, and combinations thereof.

The composite optical sheet having the diffuser plate function integrated with the diffusing means of the present invention as described above has the effect of further improving the light efficiency by incorporating the diffuser plate function as compared with the conventional composite optical sheet.

Also, by integrating each sheet, there is an effect of reducing the number of assembling processes and simplifying the manufacturing process, thereby increasing the efficiency, shortening the manufacturing cost and time, and obtaining economical effects.

In addition, by designing the integrated composite optical sheet, the rigidity and durability of the entire sheet can be improved, and the effect of preventing the sheet from being deformed due to environmental factors than when the sheet is present as each sheet.

In addition, by designing the composite optical sheet as a thin and lightweight by integrating sheets of various functions including diffusion means as described above, it is possible to provide a requirement that can meet the recent display trends.

Above all, it is possible to prevent the deformation of the pattern and the deterioration of the optical efficiency caused when the adjacent layers are combined only by the adhesive force of the spacer, the prism, the lens, or the other diffusion pattern itself. At the same time, by bonding the adjacent layers with the thick adhesive layer, it is also possible to prevent a decrease in the optical efficiency appearing due to a substantial portion of the fringe pattern being incorporated into the adhesive layer. This is because, by polymerizing with the adhesive layer before fully curing the fringe pattern, the fringe pattern and the adhesive layer are integrally cured, and thus a strong bonding force can be achieved even with a thin adhesive layer as compared with the prior art.

1 is a cross-sectional view of a composite sheet including a diffusion plate function of the present invention.
2 is a cross-sectional view of another embodiment of a composite sheet including a diffuser plate function of the present invention.
3 is a cross-sectional view of a composite sheet including a diffusion plate function further including a fourth diffusion pattern.
4 is a cross-sectional view of one embodiment of a spacer and its adjacent components in the present invention.
5 is a cross-sectional view of an embodiment of a first prism pattern and its adjacent components, or a second prism pattern and its adjacent components in the present invention.
6 is a perspective view of one embodiment of the first layer in the present invention.
7 is a perspective view of one embodiment of a second layer or a third layer in the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the following description, numerous specific details, such as specific elements, are set forth in order to provide a thorough understanding of the present invention, and it is to be understood that the present invention may be practiced without these specific details, It will be obvious to those who have knowledge of. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

First, some of the terms used in this specification are defined.

As used herein, the term resin includes not only polymers but also monomers, oligomers or monomers and oligomers which can be polymers by polymerization.

In the present specification, a prism-patterned ridgeline refers to a line that has been formed along the apex angle of the end point from the apex angle of the starting point of one of the prism patterns.

Herein, the active energy ray refers to a particle beam and an electromagnetic wave having an energy enough to cure a predetermined resin together, and includes ultraviolet rays, a laser, a microwave, an electron beam, an X-ray and the like .

In the present specification, the active energy ray-curable resin refers to a resin which can be cured by an active energy ray, and which becomes a material for forming a layer or an adhesive layer that actually exhibits a pattern.

The area occupied by the spacer 120 in the first base layer 110 in the present specification refers to the area of the bottom of the spacer 120 which is in contact with the first base layer 110. The spacer 120 has a trapezoidal cross section, Quot; a " shown in Fig.

In this specification, the area of contact of the spacer 120 with the second adhesive layer 290 refers to the area of the top surface of the spacer 120 embedded in the second adhesive layer 290 with respect to the first base layer 110 4, which shows a spacer 120 having a trapezoidal cross-section.

The bottom surface area of one prism in the prism pattern shape refers to the bottom surface area of a prism that is in contact with the base layer, that is, the area of an orthorhombic surface with respect to the base layer of the prism, Or the second prism pattern 320 is an area of a quadrangle with one side of c in Fig.

In this specification, the area of contact of one prism pattern prism with the adhesive layer in this specification refers to the area of the second base layer 210 of one prism pattern 220 of the first prism pattern 220 embedded in the third adhesive layer 390 5 indicates the area of the orthorhombic surface with respect to the third base layer 310 of one prism top portion of the second prism pattern 320 embedded in the fourth adhesive layer 490. In Figure 5, Is the area of the rectangle.

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

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an embodiment of a composite sheet including a diffusion plate function of the present invention. FIG. More specifically, the first layer 100 includes a first diffusing pattern 150 having a diffusing function, a spacer 120 having a triangular cross section, and a second diffusing pattern 130 having a hemispherical shape, A second layer 200 in which first prism pattern patterns 220 are arranged in a line and a second prism pattern pattern 320 in which a second prism pattern pattern 320 is arranged in a line perpendicular to the first prism pattern patterns 220 3 is a cross-sectional view of a composite sheet including a diffuser plate function in which a third layer 300 including a first diffusing pattern 430 and a fourth layer 400 including a third diffusing pattern 430 in a hemispherical shape are piled up one after another and integrated.

2 is a cross-sectional view of another embodiment of a composite sheet including a diffusion plate function. More specifically, the first diffusing pattern 150 includes a bead 155 or a filler 155, the spacer 120 is rectangular in cross-section, and the second diffusing pattern 130 in the form of a diffusing protrusion A second layer 200 in which a first prism pattern 220 is arranged in a line and a second prism pattern 320 are formed on the first prism pattern 220 and the second layer 200, A third layer 300 arranged in a line in a vertical direction, and a fourth layer 400 including a lens pattern 420 are piled up one after another and integrated.

As shown in Figs. 1 and 2,

A first diffusing pattern 150 including a resin including a resin not including a bead 155 or a filler 155 on a lower surface of the first base layer 110, A plurality of columnar spacers 120 spaced apart from each other on the upper surface of the first base layer 110 and a plurality of spacers 120 formed between the spacers 120 and between the spacers 120, A first layer 100 including a second diffusion pattern 130 formed on the surface of the spacer 120,

A second base layer 210 made of a resin material adhered to a top of the spacer 120 of the first layer 100 through a second adhesive layer 290 and a second base layer 210 made of a resin, Wherein the first resin layer 220 and the resin of the second adhesive layer 290 are polymerized with each other to form a polymer, (200),

A third base layer 310 made of a resin material adhered to the ridge line of the first prism pattern 220 of the second layer 200 through a third adhesive layer 390, And the resin of the top portion of the first prism pattern (220) of the second layer (200) and the resin of the third adhesive layer (390) are mutually polymerized A third layer (300) that reacts to form a polymer, and

A fourth base layer 410 made of a resin material adhered to the ridge of the second prism pattern 320 of the third layer 300 through a fourth adhesive layer 490, And a second prism pattern 430 formed on the third layer 300. The third prism pattern 420 includes a third prism pattern 420, a third prism pattern 430, or a lens pattern 420 and a third prism pattern 430, And a fourth layer (400) in which the resin of the patterned mold (320) and the resin of the fourth adhesive layer (490) polymerize with each other to form a polymer. .

As described above, in the composite optical sheet with a diffusing plate function of the present invention, the resin of each layer in contact with each other undergoes a polymerization reaction to form a polymer, which is integrated, It has an effect on height. By polymerizing the resin of each adjacent layer, specifically, the spacer 120, the prism, the lens, and other diffusion patterns with the adhesive layer before fully curing, the pattern and the adhesive layer are integrally cured, It is a main feature of the present invention that a strong bonding force can be achieved even with a thin adhesive layer. Accordingly, it is possible to prevent the deformation of the patterned shape and deterioration of the optical efficiency, which are caused when the adjacent layers are combined only by the adhesion force of the conventional spacer 120 or the prism pattern itself. At the same time, by bonding the adjacent layers with the conventional thick adhesive layer, it is also possible to prevent the deterioration of the optical efficiency appearing when a considerable portion of the patterned structure is incorporated into the adhesive layer.

Among the above-mentioned components, the prism pattern type mainly functions as a condensing function, and the diffusion pattern type mainly performs a light diffusion function, but is not limited thereto. In the case of the lens fringe pattern 420, both light condensing and diffusing functions can be performed.

The first prism pattern 220 included in the second layer 200 of the composite optical sheet with a diffusion plate function of the present invention and the second prism pattern 220 included in the third layer 300 320, and the third diffused fringe pattern 430, the lens fringe pattern 420, or the third diffuse fringe pattern 430 and the lens fringe pattern 420, which may be included in the fourth layer 400, But is not limited thereto. And can be arranged at various angles other than the vertical direction, thereby controlling the interference between each other, so that the functions of each component can be implemented efficiently.

3 is a cross-sectional view of another embodiment of a composite sheet including a diffusion plate function further including a fourth diffusion pattern 530. [ More specifically, a fourth diffusing pattern 530 is applied to the second adhesive layer 290 and the first prism pattern 220 surface of the second layer 200, the third adhesive layer 390 of the third layer 300 Sectional view of a composite sheet including a diffuser plate function further including a fourth diffusing pattern 530 in the form of a diffusing projection on the surface of the fourth adhesive layer 490 and the lens fringe pattern 420 of the fourth layer 400 . Of course, when the hemispherical second diffusing pattern 130 is formed on the first layer 100 as shown in FIG. 1, the fourth diffusing pattern 530 may be further included on the surface of the second diffusing pattern 130 have.

3, the diffusive plate-equipped composite optical sheet of the present invention includes a first diffusing pattern 150 of the first layer 100, a first prism pattern of the second layer 200 The surface of the second prism pattern 320 and the third adhesive layer 390 of the third layer 300 and the lens pattern 420 of the fourth layer 400, 3 diffused fringe pattern 430 and a fourth adhesive layer 490. The fourth diffusion fringe pattern 530 may further include a fourth diffusion pattern 530 at one or more surfaces selected from the group consisting of a diffusion pattern 430 and a fourth adhesive layer 490. Because there are various components in each layer, it is possible to interact with other components by selectively including the fourth diffusing pattern 530 in various locations.

In addition, the light can pass through the respective layers in the composite optical sheet and function as an auxiliary when condensing, diffusing, or condensing and diffusing processes are performed, and the light efficiency of the composite optical sheet can be increased. As an example, when the condensed light is diffused, it can be diffused so as to be uniformly dispersed.

In addition, the first diffusion pattern 150, the spacer 120, the second diffusion pattern 130, the second adhesive layer 290, the first prism pattern 220, the third adhesive layer 390, The prism pattern 320, the fourth adhesive layer 490, the lens pattern 420, the third diffusion pattern 430 and the fourth diffusion pattern 530 are formed of a thermosetting or active energy ray- As shown in FIG.

In addition, the active energy ray may be ultraviolet ray, but is not limited thereto.

The resins of the first base layer 110, the second base layer 210, the third base layer 310, and the fourth base layer 410 may be polyethylene terephthalate or polycarbonate. Polyethylene terephthalate or polycarbonate is excellent in light transmittance and can transmit light of a light source without distortion, and is excellent in heat resistance, so that sheet damage against heat change can be minimized. It is also advantageous in that flexibility is imparted to the base layer, which makes it easier to deal with the base layer in the process of adding additional components to the base layer.

The arithmetic mean surface roughness of the first diffusion pattern 150 is 0.5 to 3.5 mu m, preferably 0.6 to 3 mu m, more preferably 0.8 to 2.5 mu m, even more preferably 1 to 2 mu m But is not limited thereto. This is an appropriate range for preventing the problem of staining and slitting during processing and obtaining sufficient diffusion efficiency as expected.

In addition, the spacer 120 has a cross section perpendicular to the column direction of a polygonal, semicircular, arcuate, partial arc, and combinations thereof. 6 is a perspective view of the upper surface of the first layer 100 when the cross section of the spacer 120 is a trapezoid and the second diffusion pattern 130 is a lenticular.

In the present invention, a plurality of columnar spacers 120 are formed on the upper surface of the first base layer 110 so as to be spaced apart from each other. The first layer 100 and the second layer 200 are in contact with each other through the spacer 120 and thus play an integral role in integration. At this time, depending on the shape of the cross section perpendicular to the columnar direction of the spacer 120, the ratio of the area of adhesion of the spacer 120 to the second adhesive layer 290 may vary.

Since the first base layer 110 of the first layer 100 and the second adhesive layer 290 of the second layer 200 are spaced apart at regular intervals due to the spacers 120, . Since the refractive index of air is 1 and the refractive index of materials other than air is larger than 1, an air layer formed between each layer plays an essential role in light traveling in the vertical direction. When other materials than the air are filled, the light collection and diffusion efficiency of the composite optical sheet is lowered. Therefore, the diffusion effect of light can be shown through the air layer to the intended rescue structure of the diffusion pattern type.

Also, the spacer 120 itself can perform a diffusion function, a light condensing function, or a diffusion and condensing function according to the cross-sectional shape. Since each of the spacers 120 is formed in a spaced-apart relationship, a space is formed in which a second diffusion pattern 130 and a fourth diffusion pattern 530 can be formed.

The second diffusion pattern 130, the third diffusion pattern 430 and the fourth diffusion pattern 530 have an average particle diameter of 1 to 70 μm, preferably 2 to 60 μm, more preferably 5 Preferably 10 to 100 탆, more preferably 20 to 70 탆, still more preferably 30 to 60 탆, and even more preferably 30 to 60 탆, A hemisphere of the hemisphere, and combinations thereof. The diffusion protrusion has an effect of preventing the light from being partially concentrated. In addition, by using the diffusion projections having the average particle size range as described above, it is possible to effectively prevent Moire from being generated on the display screen and to obtain a sufficient light diffusion effect. And the hemispherical diffuse pattern gives the effect of uniformly diffusing the light. Further, by using the hemisphere having the average diameter range as described above, it is possible to effectively prevent the diffusion efficiency and the luminance from being lowered. In addition, Moire can be prevented from occurring on the display screen without lacking the shielding function.

Also, the diffusion protrusions may be selected from the group consisting of polygonal, circular, semicircular, arcuate, partial arcuate, and combinations thereof in cross-sectional shape. By having various cross-sectional shapes, refraction and reflection can occur at various angles depending on the difference between the incident angle and the reflection angle depending on the shape, thereby providing a diffusion effect.

In the case of hemispheres, they may be arranged in hexagonal or tetragonal form. When arranged in a honeycomb or lattice pattern, the hemispherical pattern can be arranged more densely than when randomly arranged, and thus the diffusion effect can be more strongly and evenly expressed. Further, the interference with other optical members can be controlled by changing the arrangement structure according to the required function.

The area occupied by the spacer 120 in the first base layer 110, for example, the total area of the squares having one side of a in Fig. 4 is 3 to 50% of the entire area of the first base layer 110, , Preferably 4 to 45%, more preferably 5 to 40%, and even more preferably 5 to 35%. Due to the area of such a range, the first layer 100 in which the spacer 120 is located is given sufficient force to support the second layer 200 and the third layer 300. In addition, a sufficient air layer can be secured between the first base layer 110 and the second adhesive layer 290. The second diffusion pattern 130, the fourth diffusion pattern 430 or the second diffusion pattern 130 and the fourth diffusion pattern 430 in the first layer 100 can be located sufficiently .

5, the ratio of the total area of the squares having one side of b in Fig. 5 to the second adhesive layer 290 with respect to the area of the first base layer 110 is 3 to < RTI ID = 0.0 & But is not limited to, 50%, preferably 4 to 45%, more preferably 5 to 40%, and even more preferably 5 to 35%. Because of the adhesion area in this range, the area of the second adhesive layer 290, which undergoes a polymerization reaction with the resin at the top of the spacer 120, becomes sufficient, so that the bonding force between the first layer 100 and the second layer 200 Durability can be prevented from being lowered. Also, in the first layer 100, the diffusion pattern can be positioned sufficiently to realize a diffusion function.

In addition, the columnar spacers 120 may be parallel or not parallel to each other. By varying the arrangement, the length and area of the spacer 120 contacting the second adhesive layer 290 of the second base layer 210 Can be adjusted.

In addition, the height of the columnar spacers 120 may be equal to or different from each other. If the heights are different, each spacer 120 may play a different role. For example, the higher-height spacer 120 will serve as a connection point between the first layer 100 and the second layer 200, and the lower-height spacer 120 will have an existing connection point In addition to roles, other roles such as diffusion and condensation can also be performed.

With respect to the bottom surface area of one prism of the first prism pattern 220, the ratio of the area of adhesion of the prism to the third adhesive layer 390 and the bottom area of one prism of the second prism pattern 320 5, the ratio of the area of the contact area where the prism contacts the fourth adhesive layer 490, for example, the area of the square having one side of d in FIG. 5 is 3 to 15%, preferably 4 to 14% 13%, and even more preferably 6 to 12%. Thus, the area of the third adhesive layer 390, which is polymerized with the resin of the top portion of the first prism pattern 220, is sufficiently secured, so that the bonding force or durability between the second layer 200 and the third layer 300 is inferior Is prevented. Further, the area loss on both surfaces of each prism of the first prism pattern 220 having the light converging function is not increased, and sufficient condensing efficiency can be exhibited. Likewise, the area of the fourth adhesive layer 490, which undergoes a polymerization reaction with the resin of the top portion of the second prism pattern 320, is sufficiently secured and the bonding force or durability between the third layer 300 and the fourth layer 400 is poor Is prevented. In addition, since the area loss of the two surfaces of each prism of the second prism pattern 320 having the light converging function is not increased, sufficient condensing efficiency can be exhibited.

In addition, the upper ends of the first prism pattern 220 and the second prism pattern 320 of the present invention may be polymerized and cured away from the lower surface of the base layer facing directly as shown in FIG. 1, May be polymerized and cured in a state in contact with the lower surface of the base layer facing directly as shown in Fig. This also applies to the case of the spacer 120, and may be polymerized and cured in the state of being in contact with the bottom surface of the second base layer 210 as shown in FIG. 4, or may be polymerized and cured in a state spaced apart from the bottom.

In addition, the first prism pattern 220 and the second prism pattern 320 continuously arranged may not be parallel or parallel to each other.

The first prism pattern 220, the second prism pattern 320, the second diffusion pattern 130, the third diffusion pattern 430, the lens pattern 420, The height of the pattern type selected in the group may be the same or different.

Specifically, when viewed from the direction A in FIG. 7, for example, each of the prism patterns constituting the first prism pattern 220 or the second prism pattern 320 may be parallel to each other or may not be parallel to each other . The height e of each prism pattern viewed from the direction B in Fig. 7 may be the same or different from each other.

The ridgeline of the first prism pattern 220 may be a straight line, a curved line, or a wavy line when viewed in the direction perpendicular to the plane formed by the second base layer 210, that is, the direction A in FIG.

The composite optical sheet with a diffusing plate function of the present invention has a diffusive plate function in which the second prism pattern 320 is formed so as to have a ridge line of the second prism pattern 320 when viewed from the direction perpendicular to the plane formed by the third base layer 310, May be straight, curved, or wavy.

The first prism pattern 220 is parallel to the plane formed by the second base layer 210 and is perpendicular to the first prism pattern 220 direction, The ridgeline may be a straight line, a curve, or a wavy line.

When the second prism pattern 320 is viewed in a direction parallel to a plane defined by the third base layer 310 and perpendicular to the second prism pattern 320, The ridgeline may be a straight line, a curve, or a wavy line. Such a prismatic ridge shape change is effective in improving Moire.

The bead 155 on the lower surface of the first base layer 110 has an average particle diameter of 1 to 15 mu m, preferably 2 to 14 mu m, more preferably 3 to 13 mu m, even more preferably 4 to 12 mu m May be transparent particles. By using the beads 155 having such a range, the durability of the beads 155 can be effectively ensured, and sufficient diffusion efficiency of the beads 155 performing the diffusion function can be secured. Also, it is possible to prevent the first diffusion pattern 150 including the beads 155 from becoming too thick.

The filler 155 on the lower surface of the first base layer 110 has an average particle diameter of 0.1 to 3 占 퐉, preferably 0.2 to 2.5 占 퐉, more preferably 0.3 to 2 占 퐉, still more preferably 0.4 to 1.5 占 퐉 Which may be inorganic particles. The use of the filler 155 in this range is effective in ensuring the durability of the filler 155 and in exhibiting sufficient diffusion efficiency of the filler 155 performing the diffusion function. Also, it is possible to prevent the first diffusion pattern 150 including the filler 155 from becoming too thick. Of course, the first diffusing pattern 150 constituting the composite optical sheet with a diffusing plate function of the present invention may be a patterned pattern having a diffusing function without the beads 155 or the filler 155 as shown in FIG. 1 It is also possible to manufacture it more simply and economically by forming it on the surface.

The inorganic particles may be selected from the group consisting of TiO 2 , SiO 2 , CaCO 3, and combinations thereof. Especially, TiO 2 inorganic particles, which are most widely used, are effective for maximizing the diffusion function of light due to their large hiding power, high anisotropy of refractive index and high scattering properties. In the case of SiO 2 inorganic particles, the transmittance to light is excellent, and CaCO 3 inorganic particles are excellent in light stability, and thus, light of more stable efficiency can be realized.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course it is possible. Accordingly, the scope of the present invention should not be construed as being limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the following claims.

100: first layer 110: first substrate layer
120: spacer 130: second diffused pattern
150: first diffusion pattern 155: bead or filler
200: second layer 210: second substrate layer
220: first prism pattern 290: second adhesive layer
300: third layer 310: third substrate layer
320: second prism pattern 390: third adhesive layer
400: fourth layer 410: fourth substrate layer
420: Lens pattern type 430: Third diffused pattern type
490: fourth adhesive layer 530: fourth diffusion pattern

Claims (19)

A first base layer made of a resin material,
A first diffusion pattern type resin including a resin containing or not containing a bead or a filler on a lower surface of the first base layer,
A plurality of columnar spacers formed on the upper surface of the first base layer so as to be spaced apart from each other,
A first layer comprising a second diffusion pattern formed between the spacers, on the spacer surface, or between the spacers and on the spacer surface;
A second base layer made of a resin material adhered via the second adhesive layer to the top of the spacer of the first layer,
And a first prism pattern formed continuously on the upper surface of the second base layer,
A second layer which forms a polymer by causing a resin at a top of the spacer of the first layer and a resin of the second adhesive layer to come into contact with each other before the resin is completely cured;
A third base layer made of a resin material adhered via the first prism pattern ridge of the second layer and the third adhesive layer,
And a second prism pattern formed continuously on the upper surface of the third base layer,
A third layer forming a polymer by causing polymerization of the resin of the first prism pattern-like resin of the second layer and the resin of the third adhesive layer before they are completely cured; And
A fourth base layer made of a resin material adhered via a second prism pattern ridge of the third layer and a fourth adhesive layer,
A third diffused pattern, or a lens pattern and a third diffused pattern formed on the upper surface of the fourth base layer,
And a fourth layer which forms a polymer by causing polymerization of the resin of the second prism pattern type resin of the third layer and the resin of the fourth adhesive layer before they are completely cured.
The method according to claim 1,
A first prism patterned surface or a second adhesive layer surface of the first layer, a second prism patterned or third adhesive layer surface of the third layer, a lens patterned surface of the fourth layer, , The third diffusion pattern, or the lens pattern and the third diffusion pattern, or the fourth adhesive layer surface. Features include compound optical sheet.
3. The method of claim 2,
Wherein the first diffusion pattern, the spacer, the second diffusion pattern, the second adhesive layer, the first prism pattern, the third adhesive layer, the second prism pattern, the fourth adhesive layer, the lens pattern, (4) The composite optical sheet with diffusing plate function, characterized in that the diffusing pattern type comprises a thermosetting or active energy ray-curable resin.
The method of claim 3,
Wherein the active energy ray is ultraviolet light.
The method according to claim 1,
Wherein the resin of the first base layer, the second base layer, the third base layer and the fourth base layer is polyethylene terephthalate or polycarbonate.
The method according to claim 1,
And the arithmetic average surface roughness of the first diffusion pattern is 0.5 to 3.5 占 퐉.
The method according to claim 1,
Wherein the spacer is selected from the group consisting of a polygonal, semicircular, arcuate, semi-circular, and a combination of a cross section perpendicular to the column direction.
3. The method of claim 2,
Wherein the second diffused pattern, the third diffused pattern and the fourth diffused pattern are selected from the group consisting of diffusion protrusions having an average particle diameter of 1 to 70 占 퐉, hemispheres having an average diameter of 10 to 100 占 퐉, and combinations thereof. Composite optical sheet with diffusion plate function.
9. The method of claim 8,
Wherein the diffusion protrusions are selected from the group consisting of polygonal, circular, semicircular, arcuate, partial arcuate, and combinations thereof.
9. The method of claim 8,
Characterized in that the hemispheres are arranged in a hexagonal or tetragonal manner.
The method according to claim 1,
Wherein the area occupied by the spacer in the first base layer is 3 to 50% of the area of the first base layer.
The method according to claim 1,
Wherein the ratio of the area of adhesion of the spacer to the second adhesive layer to the area of the first base layer is 3 to 50%.
The method according to claim 1,
The ratio of the area of adhesion of the prism to the third adhesive layer with respect to the bottom surface of one prism of the first prism pattern and the ratio of the area of contact of the prism to the bottom of the second prism pattern, The ratio of the adhesion area or the ratio of the area of adhesion of the prism to the third adhesive layer with respect to the bottom area of one prism of the first prism pattern and the bottom area of one prism of the second prism pattern, 4 < / RTI > adhesive layer is in the range of 3 to 15%.
The method according to claim 1,
Wherein the heights of the pattern shapes selected from the group consisting of the first prism pattern shape, the second prism pattern shape, the second diffusion pattern shape, the third diffusion pattern shape, the lens pattern shape, and the combination thereof are equal to or different from each other , Compound optical sheet with diffuser plate function.
The method according to claim 1,
The ridge of the first prism pattern in the direction perpendicular to the plane formed by the second base layer, the ridge of the second prism pattern in the direction perpendicular to the plane formed by the third base layer, The ridge line of the first prism pattern in the direction perpendicular to the plane formed by the base layer and the ridge line of the second prism pattern in the direction perpendicular to the plane formed by the third base layer are linear, Wherein the diffusing plate has a diffusing plate function.

The method according to claim 1,
The first prism pattern-like ridge parallel to the plane formed by the second base layer and perpendicular to the first prism pattern-like direction, the second prism pattern ridge parallel to the plane formed by the third base layer and the second prism- The first prism pattern ridge in a direction perpendicular to the first prism pattern direction and the second prism pattern ridge in a direction perpendicular to the first prism pattern direction, Wherein the second prism pattern ridge in a direction parallel to a plane defined by the third base layer and perpendicular to the second prism pattern direction is a straight line, a curved line, or a wavy line. Optical sheet.
The method according to claim 1,
Wherein the beads on the lower surface of the first base layer are transparent particles having an average particle diameter of 1 to 15 占 퐉.
The method according to claim 1,
Wherein the filler on the lower surface of the first base layer is an inorganic particle having an average particle diameter of 0.1 to 3 占 퐉.
19. The method of claim 18,
Wherein the inorganic particles are selected from the group consisting of TiO 2 , SiO 2 , CaCO 3, and combinations thereof.
KR1020150172445A 2015-12-04 2015-12-04 Composition optical sheet including function of diffusion plate integrated light diffusion means KR101767137B1 (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
US20090303416A1 (en) 2008-06-04 2009-12-10 Jeong Young-Hun Prism sheet, and back light unit and liquid crystal display device therewith
JP2012230364A (en) * 2011-04-12 2012-11-22 Keiwa Inc Light diffusion sheet, optical unit, backlight unit and liquid crystal display device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090303416A1 (en) 2008-06-04 2009-12-10 Jeong Young-Hun Prism sheet, and back light unit and liquid crystal display device therewith
JP2012230364A (en) * 2011-04-12 2012-11-22 Keiwa Inc Light diffusion sheet, optical unit, backlight unit and liquid crystal display device

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