KR20130046618A - Diffusing sheet for a back light unit and the manufacturing method thereof - Google Patents

Diffusing sheet for a back light unit and the manufacturing method thereof Download PDF

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Publication number
KR20130046618A
KR20130046618A KR1020110111104A KR20110111104A KR20130046618A KR 20130046618 A KR20130046618 A KR 20130046618A KR 1020110111104 A KR1020110111104 A KR 1020110111104A KR 20110111104 A KR20110111104 A KR 20110111104A KR 20130046618 A KR20130046618 A KR 20130046618A
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KR
South Korea
Prior art keywords
sheet
curable resin
diffusion sheet
acrylic
backlight unit
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KR1020110111104A
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Korean (ko)
Inventor
전해상
엄태수
송정한
김보성
신승윤
Original Assignee
도레이첨단소재 주식회사
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Priority to KR1020110111104A priority Critical patent/KR20130046618A/en
Publication of KR20130046618A publication Critical patent/KR20130046618A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0073—Optical laminates
    • 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
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer

Abstract

PURPOSE: A diffuse sheet for a back light unit and a manufacturing method thereof are provided to include an acrylic bead and an UV curable resin layer, thereby minimizing the deformation of an optical sheet by heat and preventing the deformation by heat when driving as being assembled in the backlight unit. CONSTITUTION: A functional diffusion sheet(100) for a backlight unit is comprised of a polyester film member(110) and a functional diffusion layer(120) being laminated. The functional diffusion layer(120) removes the bright line by diffusing the light transmitted from a lamp. The functional diffusion layer(120) comprises a UV curable resin(121) and an acrylic bead(122). In the UV curable resin(121), the acrylic bead(122) exists in a dispersed status. The acrylic bead(122) of the functional diffusion layer(120) has an average particle of 0.1-15μm, has a medium weight dispersion distribution, and a difference between the maximum particle and the minimum particle is less than 10um.

Description

Diffusing sheet for a back light unit and the manufacturing method

The present invention relates to a diffuser sheet for a backlight unit and a method of manufacturing the same, and more particularly, to a diffuser sheet for a backlight unit and a method of manufacturing the same so as to minimize the deformation of the optical sheet due to heat inside the backlight unit.

With the development of information technology, the market for display devices, which is a connection medium between users and information users, is growing. Accordingly, the use of flat panel displays such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs), and plasma display panels (PDPs) is increasing. Among them, liquid crystal displays (LCDs) capable of realizing high resolution and miniaturization as well as large sizes are widely used.

The liquid crystal display (LCD) may receive an image from a back light unit (BLU) positioned under the liquid crystal panel to represent an image. The backlight unit includes a light source and an optical film layer in order to provide efficient light to the liquid crystal panel. The optical film layer may include a diffusion sheet, a prism sheet, a protective sheet, a reflective sheet, and the like.

The backlight unit thus manufactured is assembled with the liquid crystal panel to be driven for a long time. In this case, the temperature inside the backlight unit is increased by the relatively high heat generated from the light source, causing thermal deformation of the optical sheet.

Referring to FIG. 2, the configuration of the direct type backlight unit will be described in more detail. As shown in FIG. 2, the direct type backlight unit includes a plurality of lamps 215 installed inside the reflector 216, and The diffusion plate 214 and the diffusion sheet 213 each having a predetermined pattern formed thereon are provided thereon. The reflector 216 reflects the light emitted from the lamp 215 toward the diffuser plate 214 and simultaneously diffuses the light emitted from the lamp 215 to reduce the number of bright lines generated by the number of lamps 215. Let's do it. The diffusion plate 214 and the diffusion sheet 213 scatter light to make the brightness uniform and remove the bright lines of the lamp 215 that are not completely removed. In addition, the diffusion plate 214 has a thickness of about 5 mm to support the panel of the liquid crystal display and the backlight unit. On the upper side of the diffusion sheet 213, a prism sheet 212 in which a triangular prism is arranged on an upper surface of the transparent resin is provided. The light passing through the diffusion sheet 214 is spread in all directions, the prism sheet 212 is focused on the light spread to the outside to increase the brightness at the front of the panel. The image diffusion sheet is used to protect the prism sheet 212 and to increase the front viewing angle.

However, the conventional conventional diffusion sheet configured as described above has a problem that deformation by heat inside the backlight unit may be easily caused, and to solve such a problem, for example, Korean Patent Publication No. 2007-0044343 The present invention discloses a method for manufacturing a heat dissipation sheet that can be attached to a reflective sheet without damage and continuously perform an endothermic function. The method for manufacturing a heat dissipation sheet is obtained by adding an acrylic resin to nano-sized fine graphite powder particles. forming a composite; And compressing the nanocomposite formed by the fine graphite powder particles and the acrylic resin, and in this method, adding a resin having excellent thermal conductivity to the nanocomposite formed by the fine graphite powder particles and the acrylic resin before the pressing step. It is disclosed that it may further include.

However, the above-mentioned conventional invention proposes to attach the heat dissipation sheet having the above-described specific configuration only to the reflective sheet as an alternative for preventing the problem caused by the temperature rise, but this method may lead to an increase in the manufacturing cost thereof. In addition, there are many disadvantages in that it is not an optimal solution to the above-mentioned conventional problem.

Patent Document 1: Republic of Korea Patent Publication No. 2007-0044343

Accordingly, the present invention has been made in view of the above-described conventional situation, and a first object of the present invention is to provide a diffusion sheet having a function of minimizing deformation of the optical sheet due to heat inside the backlight unit.

Another object of the present invention is to provide a manufacturing method which can more easily manufacture the diffusion sheet for a backlight unit having the above characteristics.

The present invention may also be aimed at achieving, in addition to the above-mentioned specific objects, other objects which can be easily derived by those skilled in the art from this and the overall description of the present specification.

In order to minimize the deformation of the sheet due to heat, the object of the present invention is to undergo a warming step in the manufacturing step of the functional diffusion sheet. Generally, in the case of using an ultraviolet curable resin, the monomer, oligomer and initiator in the resin during the warming step are used. Recognize that there is a problem of surface hardening and poor optical properties due to decomposition, volatilization of the problem, and for this reason, when using UV curable resin, the above problem is solved by adding a thermal process before or after production Could be achieved.

Diffusion sheet for a backlight unit of the present invention for achieving the above object;

In the diffusion sheet composed of a polyester film base material,

One side of the sheet substrate is characterized in that it further comprises a diffusion layer formed of an ultraviolet curable resin and acrylic spherical beads.

According to another configuration of the present invention, the polyester film substrate is characterized in that it comprises a base film and a light transmissive coating layer formed on both sides of the base film.

According to another configuration of the present invention, the acrylic beads formed on one surface of the functional sheet has an average particle diameter of 0.1 ㎛ to 15 ㎛, has a medium dispersion distribution, the difference between the maximum particle size and the minimum particle size does not exceed 10 ㎛ It is done.

According to another configuration of the present invention, the ultraviolet curable resin is at least one resin selected from the group consisting of polyester acrylate, epoxy acrylate, urethane acrylate, acrylate epoxy oil, spiro compound and mixtures thereof, The content is 15 to 80wt% and the boiling point of the oligomer and monomer is characterized in that more than 120 ℃.

According to another configuration of the present invention, a prism shape or a diffusion layer is further provided on the opposite side of the base film.

Method for producing a diffusion sheet for a backlight unit of the present invention for achieving the above another object;

In the manufacturing method of the diffusion sheet composed of a polyester film base material,

One side of the sheet substrate further comprises the step of forming a diffusion layer formed of an ultraviolet curable resin and acrylic spherical beads, the step of curing the polyester film substrate coated with the emulsion solution of the ultraviolet curable resin and acrylic spherical beads in a warm state Characterized by including.

The diffusion sheet for a backlight unit of the present invention configured as described above comprises an acrylic bead and is provided with an ultraviolet curable resin layer, and has excellent scratch resistance, antistatic properties and high hardness characteristics, in particular, Since deformation can be minimized, it is excellent in resistance to dimensional deformation in a high temperature environment, so that it can be assembled in the backlight unit to prevent deformation due to heat during driving.

1 is a schematic cross-sectional view of a diffusion sheet for a backlight unit according to a preferred embodiment of the present invention.
2 is a schematic cross-sectional view of a composite sheet in which a prism shape is added to the opposite side of a conventional diffusion sheet.

Hereinafter, the functional diffusion sheet for the backlight unit of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view of a diffusion sheet for backlight unit 100 according to a preferred embodiment of the present invention. Referring to Figure 1, the functional diffusion sheet 100 for a backlight unit of the present invention is a polyester film base 110; The functional diffusion layer 120 formed on one surface of the film substrate 110 and including the ultraviolet curable resin 121 and the acrylic beads 122 is sequentially stacked.

In the above, the polyester film substrate diffusion sheet 100 serves as a substrate for forming a functional diffusion layer or a prism layer. The polyester film substrate 110 may include a substrate film 111 and coating layers 112 and 113 formed on both surfaces of the substrate film. The base film 111 is not particularly limited, and for example, polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), Polyimides, polycarbonates, polyurethanes or mixtures thereof can be applied. On the other hand, the light-transmissive coating layers 112 and 113, such as a base film layer mainly formed of a thermoplastic resin and a functional diffusion layer or prism layer mainly formed of a thermosetting resin, when producing a base film to improve adhesion in the coating process with different materials By separate treatment, the coating layer does not fall off even in a high temperature and high humidity environment.

The functional diffusion layer 120 is formed on one surface of the light transmissive substrate 110. The functional diffusion layer 120 serves to remove the bright line by diffusing the light transmitted from the lamp. The functional diffusion layer 120 includes the ultraviolet curable resin 121 and the acrylic bead 122. In this case, as the ultraviolet curable resin 121, polyester acrylate, epoxy acrylate, urethane acrylate, acrylate epoxy oil, spiro compound and mixtures thereof may be used.

Solid content of the ultraviolet curable resin is preferably 15 to 80wt%. The solid content herein refers to the amount of resin excluding the solvent used for mixing. If the solid content does not reach 15wt%, there is a problem that the acrylic beads fall off during coating, and if it exceeds 80wt%, the mixing and dispersion with the acrylic beads are not performed properly, which is not preferable.

Acrylic beads 122 are present in the UV curable resin 121 in a dispersed state. As the acrylic beads 122 for this purpose, a combination of inorganic particles, organic particles, and inorganic particles may be used. Usable as the inorganic particles may be one or more selected from the group consisting of silica, alumina, glass, calcium carbonate and titanium dioxide. The content of the acrylic beads 122 is preferably 5 to 50wt% based on the total weight of the functional diffusion layer 120 in order to enhance the shielding characteristics of the functional diffusion layer 120 and the fixing property of the acrylic bead 122.

Acrylic beads 122 of the functional diffusion layer 120 has an average particle diameter of 0.1㎛ ~ 15㎛; It is preferable to have a medium dispersion distribution, but the difference between the maximum particle diameter and the minimum particle diameter does not exceed 10um.

In the case of the protruding particles of the functional diffusion layer, light is diffused and refracted to cause a sparking phenomenon, which is recognized in finished products and its use is limited. As a feature of the present invention for solving this problem, the protrusion of the particles should be minimized, and the protruding portion should be less than 60% of the average particle diameter. When the particle diameter of acrylic beads exceeds 15㎛, the sparkling phenomenon is deepened and its use is extremely limited, and the difference in the maximum particle size and the minimum particle diameter does not exceed 10um, thereby reducing the sparking phenomenon by making the particle protruding level constant. You can. When the particle diameter of the acrylic bead is less than 0.1㎛, particles in the functional diffusion layer is buried to implement the protruding, it is limited in use due to poor shielding and adhesion due to this.

In the manufacturing method of the diffusion sheet 100 for a backlight unit of the present invention, the emulsion solution obtained by mixing the ultraviolet curable resin 121, the acrylic bead 122 and other additives, which is a composition for forming the functional diffusion layer 120, is a light transmissive substrate. It is applied to one surface of 110 to produce a solvent through the volatilization and heating step, and curing step. That is, in the warming step, the substrate is resistant to thermal deformation due to high temperature, and the oligomer and monomer in the ultraviolet curable resin 121 should not be volatilized and decomposed at a high temperature. Application of the composition for the functional diffusion layer 120 including the ultraviolet curable resin 121, the acrylic bead 122, and other additives is not particularly limited, and conventional coating methods used in the art, such as gravure coating, bar coating, knife coating, etc. This can be used.

In the light diffusing sheet 100 for a backlight unit of the present invention, a prism sheet is further provided on one surface of the light transmissive substrate 110 on the other side of the surface on which the functional diffusion layer 120 is formed. Can be used as a member.

Hereinafter, the present invention will be described in detail with reference to examples. The following examples are merely illustrative of the present invention, the scope of the present invention is not limited to the following examples, it can be understood that it can be carried out in other specific forms without changing the technical spirit or essential features of the present invention. will be.

Example 1-1

A coating liquid having the following composition was applied to one side of the transparent polyester film (Toray Advanced Materials XG7HU7, 250 μm) with a bar coater to form a functional diffusion layer, and a solvent volatilization and warming step (90 ° C., 1 minute), ultraviolet light The functional diffusion sheet was produced through the curing step. The transparent polyester film has an acrylic light transmissive coating layer on both sides of the substrate to improve adhesion to the functional coating layer.

UV curable resins are mixed with a solvent, acrylic beads and other additives and coated, and have a solvent volatilization and heating step, UV curing, shielding properties, antistatic properties, and heat shrinkage properties.

Composition 1-1 of the coating liquid;

-UV curable resin (urethane-acrylic copolymer binder, Kumho, G-4502, monomer boiling point 100 ℃: 40.0% by weight)

Curing agent (isocyanate , CIBA, IRG-184): 4.0% by weight

-Acrylic Beads ( Polyacrylate, Gantz GB-05S, the difference between the maximum and minimum particle diameters of 10um, the distribution of medium dispersion): 5.0% by weight

Methyl ethyl ketone: 50.0 wt%

-Other additives (alkyl ether sulfate, KONISHI, PA100): 1.0%

Examples 1-2

A coating liquid having the following composition was applied to one side of the transparent polyester film (Toray Advanced Materials XG7HU7, 250 μm) with a bar coater to form a functional diffusion layer, and a solvent volatilization and warming step (150 ° C., 1 minute), ultraviolet light The functional diffusion sheet was produced through the curing step. The transparent polyester film has an acrylic light transmissive coating layer on both sides of the substrate to improve adhesion to the functional coating layer.

UV curable resins are mixed with a solvent, acrylic beads and other additives and coated, and have a solvent volatilization and heating step, UV curing, shielding properties, antistatic properties, and heat shrinkage properties.

Composition 1-2 of coating liquid;

-UV curing resin (urethane-acrylic copolymer binder, Kumho, G4502, monomer boiling point 100 ℃): 40.0% by weight

Curing agent (isocyanate, CIBA, IRG-184): 4.0% by weight

-Acrylic Beads ( Polyacrylate, Gantz GB-05S, the difference between the maximum and minimum particle diameters of 10um, the distribution of medium dispersion): 5.0% by weight

Methyl ethyl ketone: 50.0 wt%

-Other additives (alkyl ether sulfate, KONISHI, PA100): 1.0%

Example 2-1

A light diffusion sheet was manufactured in the same manner as in Example 1-1, except that the coating solution was prepared in the following composition.

Composition 2-1 of the coating liquid;

-UV curing resin (urethane-acrylic copolymer binder, Kumho, G4230 monomer boiling point 80 ℃): 40.0% by weight

Curing agent (isocyanate, CIBA, IRG-184): 4.0% by weight

-Acrylic Beads ( Polyacrylate, Gantz GB-05S, the difference between the maximum and minimum particle diameters of 10um, the distribution of medium dispersion): 5.0% by weight

Methyl ethyl ketone: 50.0 wt%

-Other additives (alkyl ether sulfate, KONISHI, PA100): 1.0%

Example 2-2

A light diffusion sheet was manufactured in the same manner as in Example 1-2, except that the coating solution was prepared in the following composition.

Composition 2-2 of the coating liquid;

-UV curing resin (urethane-acrylic copolymer binder, Kumho, G4230, monomer boiling point 80 ℃): 40.0% by weight

Curing agent (isocyanate, CIBA, IRG-184): 4.0% by weight

-Acrylic Beads ( Polyacrylate, Gantz GB-05S, the difference between the maximum and minimum particle diameters of 10um, the distribution of medium dispersion): 5.0% by weight

Methyl ethyl ketone: 50.0 wt%

-Other additives (alkyl ether sulfate, KONISHI, PA100): 1.0%

Example 3-1

A light diffusion sheet was manufactured in the same manner as in Example 1-1, except that the coating solution was prepared in the following composition.

Composition 3-1 of the coating liquid;

-UV curing resin (urethane-acrylic copolymer binder, Adcam, AD-1, monomer boiling point 120 ℃): 40.0 wt%

Curing agent (isocyanate, CIBA, IRG-184): 4.0% by weight

-Acryl Beads (Polyacrylate, Gantz GB-05S, difference between maximum particle size and minimum particle size of 10um, medium dispersion distribution): 5.0% by weight

Methyl ethyl ketone: 50.0 wt%

-Other additives (alkyl ether sulfate, KONISHI, PA100): 1.0%

Example 3-2

A light diffusion sheet was manufactured in the same manner as in Example 1-2, except that the coating solution was prepared in the following composition.

Composition 3-2 of the coating liquid;

-UV curing resin (urethane-acrylic copolymer binder, Adcam, AD-1, monomer boiling point 120 ℃): 40.0 wt%

Curing agent (isocyanate, CIBA, IRG-184): 4.0% by weight

-Acrylic Beads ( Polyacrylate, Gantz GB-05S, the difference between the maximum and minimum particle diameters of 10um, the distribution of medium dispersion): 5.0% by weight

Methyl ethyl ketone: 50.0 wt%

-Other additives (alkyl ether sulfate, KONISHI, PA100): 1.0%

Comparative Example 1

The same functional diffusion layer as in Example 1-2 was obtained except that a functional diffusion film was obtained using a polyester film (SKC, SH34U, having a light-transmitting coating layer of urethane acrylate composition on both sides of the substrate) as a light transmissive substrate. A light diffusing film was prepared by the composition.

Comparative Example 2

Except for obtaining a functional diffusion film using a polyester film (Kolon, H32P, a light-transmitting coating layer of the urethane acrylate composition on both sides of the substrate) as a light transmissive substrate of the same functional diffusion layer as in Example 1-2 A light diffusion film was prepared by the composition.

Experimental Example

1. Interference measurement; The functional diffusion sheet of each said Example and a comparative example is arrange | positioned between several glass plates, the pressure is applied to a glass plate, and the wet-out phenomenon (Newton's ring) by excessive adhesion which arises in a film is observed, and each phenomenon generate | occur | produces. Relative evaluation was carried out as follows according to the degree.

Wet-out phenomenon: No occurrence → ◎, Occurrence → X

2. haze; The haze used the haze measuring instrument (NIPPON DENSHOKU KOGYO, model 1000) of Nippon Densoku Co., Ltd., Japan based on ASTM D-1003.

3. brightness; Vertical luminance on the backlight unit assembly was measured using a BM-7 instrument (manufacturer, model name). Haze 3% was taken as 100 and the remaining values were expressed as percentages.

4. scratch resistance; The degree of scratches generated by pulling the sheet in the state of placing the sheet on the light guide plate and placing the weight of each unit (100 g to 500 g) on the light guide plate was expressed as a relative value.

* From this result, the surface hardening state is judged.

5. adhesion; After cutting the coating layer using a cross cutter, the peeling degree was measured using a 3M magic tape.

* From this result, the surface hardening state is judged.

6. heat shrinkage rate; The functional diffusion sheet (200 mm × 200 m) was dried at 90 ° C. for 1 hour using a heat oven, and the dimensional change was expressed as a percentage. The formula is as follows and the MD (Machine Direction) and TD (Transverse Direction) of the sample was measured.

(Calculation formula) (Dimension before drying-Dimension after drying) / Dimension before drying * 100

Table 1 and Table 2 show the results of measuring physical properties of the functional diffusion sheet prepared in Examples and Comparative Examples.

division Wet-out Hayes
(%) Luminance
(%) Adhesion
(%) Scratch resistance Heat Shrinkage (%) 100g 300 g 500g MD TD Example 1-1 ◎ 3 100 100 - - about 2.8% 0.2% Examples 1-2 ◎ 3 100 70 medium River River 0.05% 0.01% Example 2-1 ◎ 3 100 100 - - about 2.8% 0.2% Example 2-2 ◎ 3 100 50 River River River 0.05% 0.01% Example 3-1 ◎ 3 100 100 - - about 2.8% 0.2% Example 3-2 ◎ 3 100 100 - - about 0.05% 0.01%

In Table 1, when the temperature of the solvent volatilization and the heating step is less than 100 ℃, while excellent in adhesion and scratch resistance, poor resistance to thermal deformation (high shrinkage by heat). When the temperature of the heating step is 150 ℃, the heat shrinkage is excellent, but the surface curing state (adhesive force, scratch resistance) is different depending on the monomer boiling point in the ultraviolet curable resin.

division Wet-out Hayes
(%) Luminance
(%) Adhesion
(%) Scratch resistance Heat Shrinkage (%) 100g 300 g 500g MD TD Comparative Example 1 ◎ 3 100 100 - - about 1.0% 0.7% Comparative Example 2 ◎ 3 100 100 - - about 1.2% 0.8%

In Table 2, the characteristic variation of the functional diffusion layer according to the change of the substrate (Comparative Examples 1, 2) did not appear, but it can be seen that the resistance to thermal deformation (thermal shrinkage) is not good.

100 --- Light Diffusion Sheet 110 --- Light Transmitting Substrate
111 --- base film 112, 113 --- light transmissive coating layer
120 --- Functional Diffusion Layer 121 --- UV Curable Resin
122 --- acrylic beads

Claims (6)

In the diffusion sheet composed of a polyester film base material,
One side of the sheet substrate further comprises a diffusion layer formed of an ultraviolet curable resin and acrylic spherical beads.
The diffusion sheet for a backlight unit of claim 1, wherein the polyester film substrate includes a base film and a light transmissive coating layer formed on both surfaces of the base film.
The backlight of claim 1, wherein the acrylic beads formed on one surface of the functional sheet have an average particle diameter of 0.1 μm to 15 μm, have a medium dispersion distribution, and a difference between a maximum particle diameter and a minimum particle diameter does not exceed 10 μm. Diffusion sheet for the unit.
The method of claim 1, wherein the ultraviolet curable resin is at least one resin selected from the group consisting of polyester acrylate, epoxy acrylate, urethane acrylate, acrylate epoxy oil, spiro compound and mixtures thereof, the solid content of 15 Diffusion sheet for a backlight unit, characterized in that to 80wt% and the boiling point of the oligomer and monomer is 120 ℃ or more.
The diffusion sheet of claim 1, wherein a prism shape or a diffusion layer is further provided on an opposite surface of the base film.
In the manufacturing method of the diffusion sheet composed of a polyester film base material,
One side of the sheet substrate further comprises the step of forming a diffusion layer formed of an ultraviolet curable resin and acrylic spherical beads, the step of curing the polyester film substrate coated with the emulsion solution of the ultraviolet curable resin and acrylic spherical beads in a warm state Method for producing a diffusion sheet for a backlight unit comprising a.
KR1020110111104A 2011-10-28 2011-10-28 Diffusing sheet for a back light unit and the manufacturing method thereof KR20130046618A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107167857A (en) * 2017-06-26 2017-09-15 张家港康得新光电材料有限公司 Diffusion barrier, backlight module and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107167857A (en) * 2017-06-26 2017-09-15 张家港康得新光电材料有限公司 Diffusion barrier, backlight module and display device

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