KR101955753B1 - Optical sheet and optical display apparatus comprising the same - Google Patents

Optical sheet and optical display apparatus comprising the same Download PDF

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Publication number
KR101955753B1
KR101955753B1 KR1020160007797A KR20160007797A KR101955753B1 KR 101955753 B1 KR101955753 B1 KR 101955753B1 KR 1020160007797 A KR1020160007797 A KR 1020160007797A KR 20160007797 A KR20160007797 A KR 20160007797A KR 101955753 B1 KR101955753 B1 KR 101955753B1
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KR
South Korea
Prior art keywords
optical
light
optical sheet
pattern layer
layer
Prior art date
Application number
KR1020160007797A
Other languages
Korean (ko)
Other versions
KR20170087781A (en
Inventor
이성훈
이정호
오영
주영현
Original Assignee
삼성에스디아이 주식회사
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Application filed by 삼성에스디아이 주식회사 filed Critical 삼성에스디아이 주식회사
Priority to KR1020160007797A priority Critical patent/KR101955753B1/en
Priority to CN201680053327.2A priority patent/CN108027131A/en
Priority to PCT/KR2016/009498 priority patent/WO2017047947A1/en
Priority to TW105129667A priority patent/TWI612347B/en
Publication of KR20170087781A publication Critical patent/KR20170087781A/en
Application granted granted Critical
Publication of KR101955753B1 publication Critical patent/KR101955753B1/en

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    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • 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
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • G02F2001/01791—

Abstract

The optical sheet of the present invention includes a protective portion including a light incident surface and a light exit surface facing the light incident surface; An optical pattern layer formed on the light incident surface; And a polarizer formed on the light exit surface, wherein the optical pattern layer is formed integrally with the protective portion, and the light incident on the light incident surface has an angle of 50 to 85 degrees with respect to a normal to the light incident surface is incident yirumyeonseo each (θ 1), light emitted from the light exit surface is the brightness of the side lobe (side-lobe) which is emitted yirumyeonseo the normal and the more than 30 ° angle (θ 2) of the light exit surface, wherein Is not more than 5% of the luminance emitted in the normal direction of the light output surface.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical sheet and an optical display device including the optical sheet.

The present invention relates to an optical sheet and an optical display device including the optical sheet.

Conventional liquid crystal displays (LCDs) arrange color elements emitting red, green, and blue, respectively, to realize a desired color by each or a combination thereof. 2. Description of the Related Art An optical display device in which quantum dot (QD, quantum dot) is applied to a color element of an LCD has been attracting attention in order to increase the color reproduction ratio of the liquid crystal display device and ensure flexible characteristics and optical stability.

Therefore, when an existing BLU (back light unit) having low collimation degree applied to a liquid crystal display (LCD) is directly applied, light passing through a TFT (thin film transistor) is incident on an unintentional adjacent quantum dot, There is a drawback that the color recall rate of the apparatus is lowered.

Therefore, it is necessary to apply highly-collimated light to the optical display device to which the quantum dot is applied in order to increase the color reproduction rate, and it is necessary to develop an optical sheet capable of realizing the collimated light.

Prior art related to this is disclosed in Korean Patent Publication No. 2000-0068644.

It is an object of the present invention to provide an optical sheet having excellent collimation of emitted light and an optical display device including the same.

Another object of the present invention is to provide an optical sheet having excellent color reproduction rate and an optical display device including the same.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the present invention relates to an optical sheet.

According to one embodiment, the optical sheet includes a protective portion including a light incidence surface and a light emergence surface opposed to the light incidence surface, an optical pattern layer formed on the light incidence surface, and a polarizer Wherein the optical pattern layer is formed integrally with the protective portion, and the light incident on the light incident surface forms an angle (? 1 ) of 50 ° to 85 ° with the normal of the light incident surface, Wherein the light emitted from the light output surface forms an angle (? 2 ) of 30 ° or more with respect to the normal of the light output surface, and the brightness of the side- Or less.

Wherein the optical pattern layer includes a plurality of unit prisms arranged continuously and the height H of the unit prism is 2 to 65 占 퐉, the pitch P is 5 to 60 占 퐉, and the apex angle? 50 DEG to 80 DEG.

The pattern direction of the optical pattern layer and the absorption axis of the polarizer may be parallel.

The optical pattern layer may be integrally formed with the protective portion via an adhesive layer.

A substrate may be interposed between the protective portion and the optical pattern layer.

The protective portion and the substrate may be integrally formed of an adhesive layer.

The apex angle alpha of the unit prism may be 63 [deg.] To 67 [deg.].

Another aspect of the present invention relates to an optical display device including the optical sheet.

The optical display device according to claim 1, A liquid crystal layer including a thin film transistor (TFT) formed on the optical sheet; A second polarizer formed on the liquid crystal layer; And a quantum dot (QD) layer formed on the second polarizer.

The optical display device may further include a light guide plate under the optical sheet.

The optical sheet of the present invention has excellent collimation of emitted light, and the optical display device including the optical sheet has excellent color reproduction rate.

1 is a cross-sectional view briefly showing an optical sheet according to one embodiment of the present invention.
FIG. 2 is a schematic view showing the relationship between the normal line, the incident angle and the angle of incidence in the present invention.
3 is a cross-sectional view specifically showing an optical pattern layer of an optical sheet according to one embodiment of the present invention.
4 is a cross-sectional view showing an optical sheet according to another embodiment of the present invention.
5 is a cross-sectional view showing an optical sheet according to another embodiment of the present invention.
6 is a cross-sectional view schematically showing an optical display device according to one embodiment of the present invention.
7 is a graph showing a change in luminance (Y) according to an angle X with respect to a light exit plane normal of Example 1 and Comparative Example 1. Fig.

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention in the drawings, the widths, thicknesses and the like of respective constituent elements are slightly enlarged and omitted. Like numbers refer to like elements throughout the several views.

The terms "upper" and "lower" in this specification are defined with reference to the drawings, wherein "upper" may be changed to "lower", "lower" What is referred to as " on " may include not only superposition, but also intervening other structures in the middle. On the other hand, what is referred to as " directly on " or " directly " indicates that it is contacted without intervening other structures except for the adhesive layer.

&Quot; Collimation " in this specification means to make light parallel to a specific direction.

The term " side-lobe " as used herein means light emitted while forming an angle (? 2 ) of 30 ° or more with the normal of the light exit surface.

In the present specification, "excellent collimation" means that the luminance of the side-lobe is low.

In this specification, " integrally formed " may mean that air (or air layer) is not formed between the two layers (constitution) and that air (or air layer) May be formed so as not to be separated from the substrate. For example, the another layer may be an adhesive layer or a substrate.

Hereinafter, an optical sheet according to one embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig. FIG. 1 is a cross-sectional view briefly showing an optical sheet according to one embodiment of the present invention, and FIG. 2 is a schematic view showing a relationship between a normal line, an incident angle and an output angle in the present invention.

1, an optical sheet 100 according to an embodiment of the present invention includes a protective portion 10 including a light incident surface 13 and a light exit surface 15 opposed to the light incident surface 13, An optical pattern layer 20 formed on the light incident surface 13 and a polarizer 30 formed on the light exit surface 15. The optical pattern layer 20 is formed integrally with the protective portion 10 do.

The protective portion 10 is formed on one surface of the polarizer 30 to protect the polarizer 30 and may be a protective film or a protective layer.

The protective film may comprise an optically transparent conventional film. Examples thereof include a cyclic polyolefin type, noncyclic type polyolefin type, poly (meth) acrylate type, polycarbonate type, polyethylene terephthalate (PET), and the like including a cyclic olefin polymer (COP) A polyether sulfone system, a polysulfone system, a polyamide system, a polyimide system, a polyvinyl alcohol system, a polyvinyl chloride system, or a polyvinylidene chloride system, including polyester, triacetyl cellulose and the like. Or more.

The thickness of the protective film may be from 10 탆 to 200 탆, for example, from 30 탆 to 120 탆, and may be used in an optical display device in the above range.

The protective layer may be formed on one side or both sides of the polarizer to protect the polarizer, prevent thermal shock and moisture penetration, and prevent cracking of the polarizer.

Since the protective layer has a thickness in a predetermined range, the optical film is formed only on one side, which can compensate the strength of the polarizing plate, which may deteriorate the mechanical strength, and can realize a thinning effect. Specifically, the protective layer may have a thickness of 5 占 퐉 to 200 占 퐉, for example, 10 占 퐉 to 120 占 퐉, and the protective layer may be used in the polarizing plate in the above range, and the mechanical strength of the polarizing plate may be compensated.

The optical pattern layer 20 is formed on the light incident surface 13 of the protective portion 10 and condenses the light incident from the light guide plate or other optical sheet (not shown in FIG. 1) By emitting the light toward the polarizer 30, the efficiency of luminance and light can be increased.

In the optical sheet 100 of the present invention, the optical pattern layer 20 is formed integrally with the protective portion 10. Since the optical pattern layer 20 and the protective portion 10 are integrated to remove the air layer therebetween, light passing through the optical sheet has a low side-lobe brightness and excellent collimation, The color reproduction ratio of the display device is improved.

The lower surface of the optical pattern layer 20 may be a light incidence surface, and the upper surface of the optical pattern layer 20 may be a light exit surface.

The optical pattern layer 20 may have a refractive index of 1.35 or more, specifically 1.35 to 1.55, more specifically 1.40 to 1.55. The light converging effect and the brightness of light having an angle of 25 DEG to 40 DEG with respect to the normal to the light emitting surface are reduced in the above range.

The optical pattern layer 20 may be formed of an optically transparent ultraviolet curable resin. Specifically, the resin may include at least one of (meth) acrylic, polycarbonate, polymethyl (meth) acrylate, and urethane.

The polarizer 30 polarizes natural or artificial light so that a screen is displayed on a display device, and can be mainly made of a polyvinyl alcohol-based film. In one embodiment, the polarizer is prepared by dyeing iodine or a dichroic dye to a modified polyvinyl alcohol film such as a partially-formalized polyvinyl alcohol film or an acetoacetyl-modified polyvinyl alcohol film and stretching it in an MD (machine direction) do. Specifically, it is produced through a swelling process, a dyeing process, and a stretching process. At this time, the stretching direction is generally the absorption axis, and the direction perpendicular thereto is the transmission axis. Methods of performing each step are commonly known to those skilled in the art. In another embodiment, the polarizer may be prepared by preparing an acid catalyst-impregnated film using a coating solution containing an acid catalyst and polyvinyl alcohol, dry-stretching the acid-catalyzed impregnated film and dehydrating the film to prepare a water- Followed by stretching and neutralization.

The pattern direction of the optical pattern layer and the absorption axis of the polarizer may be parallel. The parallelism means not only the case where the angle formed by the pattern direction and the absorption axis is 0 °, but also a case where a predetermined angle is formed. For example, the pattern direction of the optical pattern layer and the absorption axis of the polarizer may be arranged to form an angle of -5 DEG to 5 DEG.

Specifically, when the alignment direction of the pattern of the optical pattern layer is made to coincide with the absorption axis direction of the polarizer in the production of the optical sheet, the efficiency of the light coming from the light source through the light guide plate becomes the best. The polarization component is separated and the transmission efficiency of the electric field component reflected by the optical pattern layer increases. As the angle between the absorption axis of the polarizer and the pattern arrangement direction of the optical pattern layer increases, the transmission efficiency of the electric field decreases. When the polarizer is vertically arranged, the efficiency becomes lowest and the brightness of the light decreases.

In an embodiment, the optical sheet may include, but is not limited to, an adhesive layer or an adhesive layer between the polarizer and the protective portion.

The polarizer 30 may have a thickness of 3 占 퐉 to 50 占 퐉. And can be used in an optical display device in the above range.

2, the normal to the light incident surface 13 and the normal to the light exit surface 15 is a line perpendicular to the surface of the protection portion 10, and the angle of the incident light corresponds to the normal to the light incident surface 13 and the angle θ 1, the angle of light exiting the light exit surface 15 is the angle θ 2 of the normal forms.

The light incident on the optical sheet 100 may form an angle of 50 DEG to 85 DEG, specifically 60 DEG to 80 DEG with respect to the normal to the light incident surface 13. [ In the above-mentioned range, the optical sheet is excellent in the condensing effect and the collimation degree of the light passing through the optical sheet.

The optical sheet 100 of the present invention has the brightness of the side-lobe emitted at an angle of 30 degrees or more with respect to the normal to the light exit surface 15 is higher than that of the light output surface 15 in the normal direction Or less. In the embodiment, the optical sheet 100 is configured such that the brightness of the side-lobe emitted at an angle of 30 degrees or more with respect to the normal to the light exit surface 15 is greater than the brightness of the light emitted in the normal direction of the light exit surface 15 4.5% or less, specifically 4% or less of the total amount of the particles. In the above-mentioned range, the light-converging effect to the desired quantum dot element is excellent, the luminance of the side-lobe can be lowered, the collimation degree is excellent, and the color reproduction ratio of the optical display device is improved.

Hereinafter, the optical pattern layer of the optical sheet according to one embodiment of the present invention will be described with reference to FIG.

3 is a cross-sectional view specifically showing an optical pattern layer of an optical sheet according to one embodiment of the present invention.

Referring to FIG. 3, the optical sheet 200 according to another embodiment of the present invention may include a reverse-prism optical pattern layer 23.

The inverse prism optical pattern layer 23 is a light converging pattern layer having a prismatic pattern and means an optical pattern layer through which the incident light passes first through the top of the prism mountain and then through the bottom of the prism mountain. The optical sheet 200 on which the reverse prism optical pattern layer 23 is formed has the effect of improving the luminance in the liquid crystal display device.

The reverse prism optical pattern layer 23 includes a plurality of unit prisms continuously arranged on the protective portion 10. [ The height H of the unit prisms may be the same or different, and may be, for example, from 2 탆 to 65 탆, specifically from 5 탆 to 40 탆. In this range, there is no moire and the light collecting effect is excellent. The pitches P of the unit prisms may be the same or different. Specifically, the pitch P may be 5 占 퐉 to 60 占 퐉, for example, 10 占 퐉 to 30 占 퐉. In addition, a gap may be provided between the pitch P and the pitch P. [ The interval may be 0 占 퐉 to 3 占 퐉, and the processability of the optical sheet of the present invention is excellent. In this range, there is no moire and the light collecting effect is excellent. The apex angle alpha of the unit prism may be 50 DEG to 80 DEG, specifically 60 DEG to 70 DEG, more specifically 63 DEG to 67 DEG. In this range, light can be condensed with the normal to the light exit surface at 25 degrees or less, thereby improving the color reproduction rate and brightness of the quantum dot device and minimizing occurrence of rainbow stains.

The refractive index of the reverse prism optical pattern layer 23 may be 1.35 to 1.70, specifically 1.40 to 1.55. In this range, the light condensing effect of the light emitted to the quantum dot element is increased, and there is an effect of reducing the luminance of the side-lobe between 30 and 40 degrees to the normal to the light exit surface.

The reverse prism optical pattern layer 23 may be formed on one side of the protective portion 10 by a molding method using ultraviolet curing. For example, in the optical sheet 200, a transparent resin composition is injected between the stamping roll and the protecting part 10 in a state where one side of the protective part 10 is in contact with a mold-engraved roll stamped with a prism pattern, And cured to form a transparent resin composition coating layer adhered to the protective portion 10 from the pulling roll.

The reverse prism optical pattern layer 23 may be formed of a composition including a transparent ultraviolet ray-curable resin as a transparent material in the visible light region. Specifically, the transparent resin may include at least one of (meth) acrylic, polycarbonate, silicone, epoxy resin or fluorine resin, but is not limited thereto. The composition for a pattern layer may further include a usual photoinitiator for ultraviolet curing.

Hereinafter, an optical sheet according to another embodiment of the present invention will be described with reference to FIG.

4 is a cross-sectional view showing an optical sheet according to another embodiment of the present invention.

Referring to FIG. 4, the optical sheet 300 according to another embodiment of the present invention may be formed integrally with the protective portion 10 via the adhesive layer 40. By removing the air layer between the optical pattern layer 20 and the protective portion 10, the optical sheet 300 is excellent in the collimation degree of light passing through the optical sheet, thereby improving the color reproduction rate of the optical display device.

The adhesive layer 40 may be formed of a composition for a pressure-sensitive adhesive layer containing a (meth) acrylate resin, a curing agent, an initiator, and a silane coupling agent.

The (meth) acrylic resin is a (meth) acrylic copolymer having an alkyl group, a hydroxyl group, an aromatic group, a carboxylic acid group, an alicyclic group, a heteroalicyclic group, or the like and may include a conventional (meth) acrylic copolymer. Specifically, a (meth) acrylic monomer having an unsubstituted C1 to C10 alkyl group, a (meth) acrylic monomer having a C1 to C10 alkyl group having at least one hydroxyl group, a (meth) acrylic monomer having an C6 to C20 aromatic group (Meth) acrylic monomer having a carboxylic acid group, a (meth) acrylic monomer having a C3 to C20 alicyclic group, a C3 to C10 heteroalicyclic group having at least one of nitrogen (N), oxygen (O) (Meth) acryl-based monomer having at least one group selected from the group consisting of (meth) acryl-based monomers.

The curing agent may be a bifunctional (meth) acrylate such as hexanediol diacrylate as a polyfunctional (meth) acrylate; Trifunctional (meth) acrylates of trimethylolpropane tri (meth) acrylate; Tetrafunctional (meth) acrylates such as pentaerythritol tetra (meth) acrylate; Pentafunctional (meth) acrylates such as dipentaerythritol penta (meth) acrylate; (Meth) acrylate such as dipentaerythritol hexa (meth) acrylate, but are not limited thereto.

The initiator may be a thermal initiator or a photoinitiator, but is not limited thereto. The photoinitiator may include the photo-radical initiator described above as a typical photoinitiator.

The silane coupling agent may be selected from the group consisting of epoxy silane, mercaptosilane, aminosilane, vinyl trichlorosilane, vinyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 2- Ethyl-3-aminopropylmethyldimethoxysilane and 3-ureidopropyltriethoxysilane can be used.

The composition for a pressure-sensitive adhesive layer may further include a light diffusing agent to further diffuse the light.

The composition for a pressure-sensitive adhesive layer may comprise 100 parts by weight of a (meth) acrylic resin, 0.1 to 30 parts by weight of a curing agent, 0.1 to 10 parts by weight of an initiator, and 0.1 to 20 parts by weight of a silane coupling agent. Within the above range, the optical pattern layer 20 and the protective portion 10 can be sufficiently adhered.

The thickness of the adhesive layer 40 may be 10 占 퐉 to 100 占 퐉. It is possible to sufficiently adhere the optical pattern layer 20 and the protective portion 10 within the above range.

Although not shown in the drawing, the optical sheet 300 according to another embodiment of the present invention may further include a flat layer formed between the substrate and the optical pattern layer.

The thickness of the flat layer may be 2 탆 to 200 탆 in consideration of the transmittance and the flattening effect of the optical pattern layer. The flat layer can be manufactured using the same material as the optical pattern layer.

The optical sheet 400 according to another embodiment of the present invention is substantially the same as the optical sheet 100 according to the embodiment except that the adhesive layer 40 is further formed.

Hereinafter, an optical sheet according to another embodiment of the present invention will be described with reference to FIG. 5 is a cross-sectional view showing an optical sheet according to another embodiment of the present invention.

Referring to FIG. 5, the optical sheet 400 according to another embodiment of the present invention may further include a substrate 27 between the protective portion 10 and the optical pattern layer 20.

The optical sheet 200 is substantially the same as the optical sheet 200 according to the embodiment of the present invention except that the optical pattern layer 20 is formed on the substrate 27. [ The optical sheet 400 is formed such that the base material 27 of the optical pattern layer 20 is formed directly on the protective portion 10 via an adhesive layer (not shown). Specifically, the protective portion 10 and the substrate 27 may be integrally formed of an adhesive layer. For example, the protective portion 10 and the substrate 27 are laminated via the adhesive layer so that the air (or the air layer) is not present between the protective portion 10 and the adhesive layer and between the adhesive layer and the substrate 27, And may be formed without being spaced apart. The base 27 of the optical pattern layer 20 and the protective portion 10 are integrated with each other and the air layer therebetween is removed so that the collimation degree is excellent and the color reproduction ratio of the optical display device is improved.

Hereinafter, a method of forming the substrate 27 and the optical pattern layer 20 will be mainly described.

The base material 27 is formed between the optical pattern layer 20 and the protective portion 10 and can support the optical pattern layer 20 and the protective portion 10.

The substrate 27 may be a light incident surface on the side adjacent to the optical pattern layer 20 and a side adjacent to the protective portion 10 on the side of the optical pattern layer 20. [ The base material 27 can emit the light incident from the optical pattern layer 20 to the protective portion 10.

The substrate 27 may be formed of an optically transparent resin. Specifically, it may include at least one of a polyester including a polycarbonate, a polyethylene terephthalate and the like, a (meth) acrylic resin, and an amorphous cyclic polyolefin (COP).

The substrate 27 may have a thickness of 10 mu m to 300 mu m, specifically, 25 mu m to 100 mu m. And can be used in an optical display device in the above range.

The optical pattern layer 20 may be formed of a composition containing a ultraviolet ray-curable transparent resin as a transparent material in the visible light region. Specifically, the transparent resin may include at least one of (meth) acrylic, polycarbonate, silicone, epoxy resin or fluorine resin, but is not limited thereto. The composition for the optical pattern layer may further comprise a usual photoinitiator for ultraviolet curing.

The adhesive layer is substantially the same as the adhesive layer described in the other embodiments of the present invention.

Another aspect of the present invention relates to an optical display device including the optical sheet. Hereinafter, an optical display device according to one embodiment of the present invention will be described with reference to FIG. 6 is a cross-sectional view schematically showing an optical display device according to one embodiment of the present invention.

Referring to FIG. 6, an optical display device 1000 according to an embodiment of the present invention may include the optical sheet 100 of the present invention.

The optical display device 1000 may be a quantum dot (QD) LCD display. A quantum dot (QD) LCD display can include a quantum dot (QD) layer in a conventional LCD display that replaces a color filter with a quantum dot (QD) device.

More specifically, the optical display device 1000 includes an optical sheet 100 as one aspect of the present invention, a liquid crystal layer 200 including a thin film transistor (TFT) 210 formed on the optical sheet 100 A second polarizer 300 formed on the liquid crystal layer 200 and a quantum dot (QD) layer 400 formed on the second polarizer 300. Here, the second polarizer 300 means a polarizer other than the polarizer 30.

The optical sheet 100 is substantially the same as the above-described optical sheet as one aspect of the present invention.

The liquid crystal layer 200 is positioned between the second polarizer 300 and the polarizer 30 of the optical sheet 100 and forms an image by passing or blocking the incident light through the second polarizer 300 . Specifically, the liquid crystal layer 200 includes a thin film transistor (TFT) The TFT 210 guides the light emitted from the optical sheet 100 to the quantum dot (QD) layer 400 by applying or not applying (or applying or not applying) a voltage to the liquid crystal cell layer, 2 polarizer 300, thereby realizing an image.

The liquid crystal layer 200 includes a liquid crystal cell layer encapsulated between two substrates, and the liquid crystal cell layer may include a vertical alignment mode, an in place switching mode, a fringe field switching mode, a twisted nematic mode, And the like.

The second polarizer 300 may be substantially the same as, but not limited to, the polarizer 30 described in one embodiment of the present invention described above. The absorption axis of the second polarizer 300 is perpendicular to the absorption axis of the polarizer 30 (90 [deg.]). The vertical direction may include a case where the absorption axis of the second polarizer 300 is 90 ° with respect to the absorption axis of the polarizer 30 as well as a case where a predetermined angle is formed. For example, the absorption axis of the second polarizer 300 and the absorption axis of the polarizer 30 may be arranged to form an angle of 85 ° to 95 °.

A quantum dot (QD) layer 400 absorbs or re-emits a specific wavelength of the incident light, thereby causing the light to be colored or partially blocking light.

In an embodiment, a quantum dot (QD) layer 400 may include quantum dot elements 403, 405, 407, 409 and a black matrix 401.

The quantum dot elements 403, 405, 407, and 409 may be formed at positions corresponding to the TFTs of the liquid crystal layer 200. Specifically, a quantum dot element may be formed on the TFT 210, and a black matrix 401 may be disposed on an upper portion not corresponding to the TFT 210.

The quantum dot device may include one or more of a red (R) device, a green (G) device, and a white (W) device.

By including the optical sheet of the present invention in a quantum dot (QD) LCD display, light with excellent collimation is incident on the quantum dot device, thereby improving the color reproduction rate of the optical display device 1000.

The optical display device 1000 may further include a light guide plate 50 for guiding the light incident from the light source (not shown) to the optical sheet 100. Although not shown, the light guide plate 50 may further include a reflective sheet that reflects light generated from a light source (not shown) to be incident on the light guide plate 50 again to improve light efficiency.

The light guide plate 50 may function to make light incident from a light source (not shown) incident on the optical sheet 100 while forming an angle? 1 between 50 and 85 degrees with the normal line of the light incident surface. The light guide plate 50 may include a conventional light guide plate known to those skilled in the art.

The reflection sheet (not shown) may be a conventional reflection sheet (reflection type, diffusion type) known to those skilled in the art. Specifically, in order to enhance the light collecting effect and collimation effect of the optical pattern layer of the optical sheet of the present invention, Sheet, specifically a Gaussian reflection sheet can be applied. When a reflection type reflective sheet is applied to a Quantum dot liquid crystal display (QD LCD) device, the collimation degree of the optical sheet can be further increased, and thus the color reproduction rate is advantageously excellent.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example

Example  One

The polyvinyl alcohol film was stretched three times at 60 ° C, adsorbed iodine, and then stretched 2.5 times in an aqueous boric acid solution at 40 ° C to prepare a polarizer. Polarizers were prepared by adhering TAC (triacetyl cellulose) film (thickness 80 占 퐉) as a protective part to both sides of the polarizer with an adhesive for polarizing plate (Nippon Goshei, Z-200).

The optical pattern layer was formed by using a PET (polyethylene terephthalate) base film (manufactured by Mitsubishi, T910E, a thickness of 10 mm, a pitch P of 13 m and a vertex angle? : 75 占 퐉).

An adhesive layer was formed between the prepared polarizing plate and the base film of the optical pattern layer to join the polarizer protecting portion and the optical pattern layer to produce an optical sheet in which the optical pattern layer was integrally formed with the protective portion. At this time, the absorption axis of the polarizer was aligned with the pattern arrangement direction of the optical pattern layer.

A light guide plate (46 inches Laser pattern LGP, manufactured by H Company) was formed under the optical pattern layer of the manufactured optical sheet, a reflection type reflective sheet (3M company, ESR) was formed under the light guide plate, Were used. The incidence angle of the light incident on the optical sheet was 60 to 80 degrees.

Further, a quantum dot liquid crystal display (QD LCD) device was manufactured by forming a liquid crystal layer, a second polarizer and a light emitting layer on the polarizer of the optical sheet.

Comparative Example  One

A prism optical pattern having a height H of 25 占 퐉, a pitch P of 50 占 퐉 and a vertex angle? Of 90 占 was formed on a PET (polyethylene terephthalate) base film (Mitsubishi, T910E, thickness: 125 [micro] m). A quantum dot liquid crystal display (QD LCD) device was formed in the same manner as in Example 1 except that two prism sheets produced in this manner were laminated so as to be perpendicular to each other with the prism acid direction facing the polarizing plate.

How to measure property

(1) Luminance (%) by emission angle: The luminance value was measured for each viewing angle using EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM). Relative luminance for each viewing angle was calculated as {(luminance value for each viewing angle) / (luminance value at 0 DEG)} x 100 based on viewing angle 0 °. The outgoing angle means an angle formed with the normal line of the protective layer. At this time, the reference point of the color reproduction rate implementation is defined as the side lobe reference angle with the luminance ratio of ± 30 °, and the average of the luminance ratio of the larger angle is defined as the side lobe (avg.).

(2) Color Reproduction Rate (DCI): The color recall ratio is represented by a DCI (Digital Cinema Initiatives) index through a color coordinate measurement (Minolta CS1000, KONICA), and the color of the Quantum dot liquid crystal display The recall ratio is shown in Table 1 below.

Example 1 Comparative Example 1 Polarizing plate / optical pattern layer laminate ○ × Optical pattern layer apex angle 65 90 Brightness according to angle of incidence
ratio(%) ± 20 ° 11% 70.1% ± 30 ° 3.7% 42.3% ± 40 ° 2.0% 24.2% ± 50 ° 1.7% 14.9% ± 60 ° 2.0% 10.3% ± 70 ° 2.4% 9.5% Color Repeatability (DCI) 99 56

As can be seen from Table 1, the Quantum dot liquid crystal display (QD LCD) of the embodiment, which includes the optical sheet in which the optical pattern layer for condensing light on the element is formed integrally with the protective portion, It can be seen that the color reproduction rate is much better than the example. In particular, it can be seen that the luminance of side-lobes emitted while forming an angle (? 2 ) of 30 ° or more with respect to the normal of the light exit surface is low and the collimation degree is excellent.

7 is a graph showing changes in luminance (Y) according to the angle X with respect to the normal of the light exit surface of Example 1 and Comparative Example 1. Fig.

7, Example 1 satisfies 5% or less of the luminance of light emitted in the direction normal to the light exit surface while forming the angle of 30 ° or more with the normal to the light exit surface, but Comparative Example 1 does not .

As can be seen from Fig. 7, the optical sheet of the embodiment in which the optical pattern layer and the protective portion are integrally formed has excellent optical collimation. However, it can be seen that the optical sheet of the comparative example in which the optical pattern layer and the protective portion are not laminated is not.

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, It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are in all respects illustrative and not restrictive.

Claims (10)

A protective portion including a light incident surface and a light outgoing surface facing the light incident surface;
An optical pattern layer formed on the light incident surface; And
A polarizer formed on the light exit surface;
Lt; / RTI >
Wherein the optical pattern layer is formed integrally with the protective portion,
The light incident on the light incidence surface is incident on the light incidence surface at an angle (? 1 ) of 50 to 85 degrees with the normal to the light incidence surface,
Wherein the light emitted from the light output surface forms an angle (? 2 ) of 30 ° or more with respect to the normal of the light output surface, and the brightness of the side- 5% or less,
And the pattern direction of the optical pattern layer and the absorption axis of the polarizer are parallel.
The optical element according to claim 1, wherein the optical pattern layer comprises a plurality of unit prisms arranged in a continuous manner,
Wherein the unit prism has a height H of 2 to 65 占 퐉, a pitch P of 5 to 60 占 퐉 and a vertex angle? Of 50 to 80 占.
delete The optical sheet according to claim 1, wherein the optical pattern layer is formed integrally with the protective portion via an adhesive layer.
The optical sheet according to claim 1, further comprising a substrate between the protective portion and the optical pattern layer.
6. The optical sheet according to claim 5, wherein the protective portion and the substrate are integrally formed of an adhesive layer.
The optical sheet according to claim 2, wherein the apex angle? Of the unit prism is 63 ° to 67 °.
An optical display device comprising the optical sheet of claim 1.
The display device according to claim 8, wherein the optical display device
An optical sheet according to claim 1;
A liquid crystal layer including a thin film transistor (TFT) formed on the optical sheet;
A second polarizer formed on the liquid crystal layer; And
And a quantum dot (QD) layer formed on the second polarizer.
The optical display device according to claim 8, wherein the optical display further comprises a light guide plate under the optical sheet.

KR1020160007797A 2015-09-17 2016-01-21 Optical sheet and optical display apparatus comprising the same KR101955753B1 (en)

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KR1020160007797A KR101955753B1 (en) 2016-01-21 2016-01-21 Optical sheet and optical display apparatus comprising the same
CN201680053327.2A CN108027131A (en) 2015-09-17 2016-08-26 Optical sheet and the optical display containing it
PCT/KR2016/009498 WO2017047947A1 (en) 2015-09-17 2016-08-26 Optical sheet and optical display device comprising same
TW105129667A TWI612347B (en) 2015-09-17 2016-09-13 Optical sheet and optical display comprising the same

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100901466B1 (en) * 2006-06-06 2009-06-08 미쿠니 일렉트론 컴퍼니 리미티드 Plane Light Source Apparatus and Prism Sheet and Liquid Crystal Display Apparatus
JP2015036732A (en) * 2013-08-12 2015-02-23 富士フイルム株式会社 Liquid crystal display device, retardation film, and polarizing plate

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008003515A (en) * 2006-06-26 2008-01-10 Fujifilm Corp Optical sheet and method of manufacturing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100901466B1 (en) * 2006-06-06 2009-06-08 미쿠니 일렉트론 컴퍼니 리미티드 Plane Light Source Apparatus and Prism Sheet and Liquid Crystal Display Apparatus
JP2015036732A (en) * 2013-08-12 2015-02-23 富士フイルム株式会社 Liquid crystal display device, retardation film, and polarizing plate

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