WO2013055112A1 - Structure de feuille optique - Google Patents

Structure de feuille optique Download PDF

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Publication number
WO2013055112A1
WO2013055112A1 PCT/KR2012/008232 KR2012008232W WO2013055112A1 WO 2013055112 A1 WO2013055112 A1 WO 2013055112A1 KR 2012008232 W KR2012008232 W KR 2012008232W WO 2013055112 A1 WO2013055112 A1 WO 2013055112A1
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WO
WIPO (PCT)
Prior art keywords
optical
optical sheet
adhesive layer
shape
patterns
Prior art date
Application number
PCT/KR2012/008232
Other languages
English (en)
Korean (ko)
Inventor
조성식
조성민
김영일
민지홍
권오현
이태준
이우종
정진길
Original Assignee
주식회사 엘엠에스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 엘엠에스 filed Critical 주식회사 엘엠에스
Publication of WO2013055112A1 publication Critical patent/WO2013055112A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising 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
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package

Definitions

  • the present invention relates to an optical sheet structure, and more particularly, to an optical sheet structure that can secure a certain level or more by maintaining the adhesion between the optical sheets while minimizing the degradation of the optical properties of the light passing through.
  • LCDs liquid crystal displays
  • Such a liquid crystal display device is applied with a backlight unit for irradiating light in the liquid crystal panel direction.
  • the backlight unit includes various kinds of optical sheets for refracting, condensing, and diffusing light such that light generated from the light source is uniformly incident on the front surface of the liquid crystal panel.
  • the optical sheet includes two optical sheets having a prism pattern of a triangular cross section in order to focus light in the liquid crystal panel direction, and the two optical sheets are stacked up and down so that each prism pattern crosses each other.
  • an adhesive layer is provided between two optical sheets having a prism pattern.
  • the adhesive layer is formed on the entire surface of the lower surface of the prism pattern optical sheet located on the top.
  • the conventional adhesive layer is provided on the front surface between two optical sheets having a prism pattern, in the conventional optical sheet structure, the entire upper end portion of the prism pattern penetrates into the adhesive layer, so that a wet-out phenomenon occurs and moiré occurs. Patterns are generated, and optical characteristics such as optical path change and luminance decrease by the adhesive layer are deteriorated.
  • the present invention is to solve the technical problem to provide an optical sheet structure that can secure a certain level or more by maintaining the adhesion between the optical sheets while minimizing the degradation of the optical properties of the light passing through.
  • a first optical sheet including an upper surface on which the optical structure is formed such that the heights of the upper end portions are different from each other;
  • optical sheet structure comprising a.
  • the optical structure is separated by at least a portion of the first optical structure and the plurality of first optical structures, and the plurality of second optics having a height higher than the height of the first optical structure It may include a structure.
  • the distance between the upper ends of the plurality of second optical structures can be formed constant.
  • the plurality of second optical structures may be formed of a prism structure formed linearly parallel to each other.
  • the first optical sheet, the surface connecting the upper end of the upper surface may have an embossed form.
  • the first optical sheet is a plurality of optical structures formed on one surface of the first refraction portion is linearly arranged at a predetermined distance from each other having a flat plate-shaped first refraction portion and an optical cross section It may include a second refractive portion having a pattern.
  • the curves interconnecting the ends of the plurality of optical structure patterns are formed to have convex portions or concave portions having different heights, and each of the plurality of optical structure patterns has different ends in the formed direction thereof. It may be formed to have a convex portion or a concave portion having a height.
  • the optical structure pattern may be a polygonal shape or a partial arc shape in the cross-sectional projection, or may have a shape in which the polygonal shape and the partial arc shape is complex.
  • the convex portion or concave portion formed by the curve interconnecting the ends of the plurality of optical structure patterns, or the convex portion or concave portion formed in the direction in which each of the plurality of optical structure patterns are formed The plurality of optical structure patterns may be formed at equal intervals.
  • the convex portion or concave portion formed by the curve interconnecting the ends of the plurality of optical structure patterns, or the convex portion or concave portion formed in the direction in which each of the plurality of optical structure patterns are formed may be formed at irregular intervals.
  • the adhesive layer may be formed in a dot shape on a portion of the upper surface of the first optical sheet.
  • the adhesive layer may be formed in a plurality of bands parallel to each other on a portion of the upper surface of the first optical sheet.
  • the adhesive layer may be formed in a mesh shape having a plurality of open areas in a portion of the upper surface of the first optical sheet.
  • the adhesive layer may have an area of 5% or more and 65% or less of the planar area of the first optical sheet.
  • the area in direct contact with the structured surface of the first optical sheet is reduced to reduce infiltration and moire patterns are generated. Can be suppressed.
  • an adhesive layer is formed only on a part of the surface to be bonded so that partial bonding is performed. While ensuring a firm bonding force between the light guide plate and the optical sheet, it is possible to minimize the optical characteristic variation due to the application of the adhesive layer. In particular, it is possible to further increase the effect of suppressing the moiré pattern by reducing the above-mentioned infiltration phenomenon.
  • the present invention by providing an appropriate bonding force by partial adhesion, it is possible to suppress problems such as warpage phenomenon, deformation and distortion that may appear when the ultra-thin optical sheet is applied. Through this, the thickness of the entire backlight unit can be reduced by enabling the use of a thinner optical sheet.
  • FIG. 1 is an exploded cross-sectional view of a liquid crystal display to which an optical sheet structure according to an embodiment of the present invention is applied.
  • FIGS. 2 to 14 are perspective views or cross-sectional views for describing the structure of the first optical sheet according to various embodiments of the present disclosure.
  • FIG. 15 is a view illustrating a dot-shaped adhesive layer and an optical sheet applied to an optical sheet structure according to an embodiment of the present invention.
  • 16 is a view showing a plurality of band-shaped adhesive layers and optical sheets applied to the optical sheet structure according to the embodiment of the present invention.
  • 17 is a view showing a mesh-shaped adhesive layer and an optical sheet applied to the surface light source device according to the embodiment of the present invention.
  • FIG. 18 is a graph illustrating measurement of luminance of light transmitted while varying a ratio of the thickness of the adhesive layer and the area of the entire optical sheet structure in the optical sheet structure according to various embodiments of the present disclosure.
  • FIG. 1 is an exploded cross-sectional view of a liquid crystal display to which an optical sheet structure according to an embodiment of the present invention is applied.
  • a liquid crystal display to which an optical sheet structure according to an exemplary embodiment of the present invention is applied includes a light guide plate for transmitting a light source 111 and light generated from the light source toward the liquid crystal display panel 170. 110, a light diffusion plate 120 for diffusing light transmitted from the light guide plate 110, a first optical sheet 130 and a second optical sheet 150 having an optical structured surface for condensing, An adhesive layer 140 interposed between the two optical sheets 130 and 140 to provide an adhesive force between the two optical sheets 130 and 150, and a polarizer 160 and a polarizer 160 disposed on the second optical sheet 150. It may be configured to include a liquid crystal display panel 170 disposed on.
  • various optical sheets provided to the liquid crystal display are stacked between the light guide plate 110 and the liquid crystal display panel 170.
  • the laminate structure of this optical sheet is optimized to achieve the desired special optical performance, and additional elements may be added or omitted as necessary.
  • the present invention relates to a laminated optical sheet structure in which two or more optical sheets are bundled and packaged through an adhesive layer 140 between optical sheets applied to the liquid crystal display described above.
  • an embodiment of the present invention may include a first optical sheet 130, an adhesive layer 140, and a second optical sheet 150.
  • the first optical sheet 130 and the second optical sheet 150 may be partially bonded by a plurality of adhesive layers 140.
  • the partial bonding or the partial bonding means that the adhesive layer or the adhesive layer is not evenly distributed on the entire surface of the surface to be bonded, and the adhesive layer is formed only on the corresponding region where the adhesive layer is formed by forming an adhesive layer only on a part of the surface to be bonded. Means that.
  • the first optical sheet 130 may have one surface (the surface corresponding to the upper surface in FIG. 1) as an optical structured surface.
  • the optical structured surface refers to a surface on which an optical structure capable of adjusting light paths to collect light incident from a lower surface of the first optical sheet 130 is formed.
  • a plurality of prism structures are adopted in the first optical sheet disposed on the light exit surface of the light guide plate in the same shape side by side in one direction.
  • the structured surface of the first optical sheet 130 is formed with an optical structure having regions where the ends have different heights. Due to the height difference between the ends, the infiltration phenomenon may be reduced by reducing the size of the region where the ends of the optical structure penetrate the bonding layer 140.
  • FIGS. 4 to 14 are views for explaining the structure of the first optical sheet according to various embodiments of the present invention.
  • 2 and 3 illustrate an example in which the heights of the optical structures themselves formed on the first optical sheet are different from each other
  • FIGS. 4 to 14 show convex portions formed by connecting upper ends of the optical structures formed on the first optical sheet.
  • the example formed in the embossed form which has curvature of a recessed part is shown.
  • the surface connecting the upper end is a virtual surface, and the same applies to various embodiments described below.
  • the first optical sheet 131 in the first optical sheet 131 according to an embodiment of the present invention, two types of optical structures 231 and 232 having different heights may be used as the first optical sheet 131. ) On the structured surface.
  • the first optical structure 231 is an optical structure having a lower height than the second optical structure 232.
  • the second optical structure 232 has a height higher than that of the first optical structure 231, and may be separately disposed by the first optical structure 231. That is, a predetermined number of first optical structures 231 may be disposed between the second optical structures 231.
  • the second optical structures 232 may have a constant distance between the upper ends thereof.
  • the second optical structure 232 is preferably formed of a prism structure formed in parallel to each other.
  • the second optical structure 232 penetrates into the adhesive layer 140 to form a second optical structure.
  • a junction may be formed with the sheet 150, and a gap may exist between the adhesive layer 140 or the second optical sheet 150 and the first optical structure 231.
  • the contact area between the first optical sheet 130 and the second optical sheet 150 or the contact area between the first optical sheet 130 and the adhesive layer 140 is reduced to prevent infiltration. Can be reduced.
  • the effect of reducing the infiltration phenomenon by the adhesive layer 140 formed to enable partial bonding, which will be described later, may be further increased.
  • the second optical sheet 150 bonded to the first optical sheet 130 via the adhesive layer 140 may be formed of an optical structure formed on the first optical sheet 130.
  • the second optical sheet 150 may be any type of optical sheet (for example, a polarizing sheet or a diffusion sheet) or an optical structure disposed on the structured surface of the first optical sheet 130 to realize optical characteristics. This may be the case.
  • FIGS. 4 to 14 show various embodiments of the first optical sheet 122 in which the surface connecting the upper end portion has an embossed shape.
  • the first optical sheet 122 may include a first refraction portion 310 and a second refraction portion 320 having an optical structure pattern formed on the first refraction portion 310.
  • the portions indicated by the dotted lines represent convex or concave embossed surfaces.
  • FIG. 4 is a perspective view of a first optical sheet according to an embodiment of the present invention
  • FIG. 5 is a cross-sectional view of the first optical sheet shown in FIG. 4.
  • the first optical sheet 132 transmits the first refraction portion 310 and the first refraction portion 310 having a flat plate shape. It may include a second refracting portion 320 having a plurality of optical structure patterns 321 for condensing the light emitted in the vertical direction.
  • the first refraction unit 310 may be provided in the form of a light transmitting film, and may be a substrate for bonding the second refraction unit 320 to an upper surface thereof.
  • the optical structure patterns 321 of the second refraction unit 320 are prismatic patterns having a triangular optical cross section in cross-sectional projection, and may be linearly arranged at predetermined intervals.
  • the optical structure patterns 321 may have a curved shape having a high peak and a low peak.
  • the curves connecting the ends of the plurality of optical structure patterns 321 are formed to have convex portions or concave portions having different heights.
  • each of the plurality of optical structure patterns is formed to have convex portions or concave portions having end portions different in height in the formed direction thereof.
  • the convex portions or the concave portions may be spaced apart from each other to form an embossed shape.
  • each of the plurality of optical structural patterns is an example including an arc-shaped convex part formed at regular intervals in the formed direction thereof.
  • the surface formed at the upper end of the optical structure pattern 321 may be embossed.
  • the upper surface of the embossed shape having a height difference may form a gap with the first optical structure 231 when bonding the adhesive layer 140 or the second optical sheet 150.
  • infiltration may be reduced by reducing the contact area between the first optical sheet 132 and the second optical sheet 150 or the contact area between the first optical sheet 132 and the adhesive layer 140.
  • the effect of reducing the infiltration phenomenon by the adhesive layer 140 formed to enable partial bonding, which will be described later, may be further increased.
  • the first refraction unit 310 and the second refraction unit 320 are any one of polycarbonate, PVC, PP, PE, PET, and acrylic polymers as a light transmissive material that can transmit light smoothly in the visible region. It can be molded into a single layer to form a unity with each other. Of course, depending on the conditions, the first refraction unit 310 and the second refraction unit 320 may be manufactured in a multi-layer structure that is bonded to each other after molding using the same material or different materials among the above-described materials.
  • the optical sheet 132 according to an embodiment of the present invention, as shown in Figure 6 and 7, the curve connecting the ends of the optical structure patterns 321 of the second refractive portion 320
  • the shape of the end portion of the optical structure pattern itself may include an ellipse or a polygonal upwardly projecting convex portion, and the convex portions may be formed in the form of embossed spaces.
  • the surface formed by the ends of the optical structure patterns 321 may be formed to have an embossed pattern having convex portions of various shapes.
  • a curved line connecting the ends of the optical structure patterns 321 of the second refraction unit 320, or the shape of the end portion of one optical structure pattern itself is circular.
  • the concave portion may have an ellipse, a polygonal shape, and have a concave portion recessed downward in cross section, and the concave portions may be formed in an embossed form spaced apart from each other.
  • the surface formed by the optical sheet 132 according to the embodiment of the present invention may be implemented in an embossed form in which a concave pattern is repeated.
  • the optical structure pattern 321 may be formed to have an optical cross section of a partial arc shape as shown in FIG. 12 in addition to the optical cross section of a triangular shape, and as shown in FIG.
  • the optical cross section of the triangular shape may be formed into a complex shape.
  • the convex or concave portions may be formed at irregular intervals, and the intervals between the optical structure patterns 321 may be regularly formed.
  • at least one or both of a curved line connecting the ends of the optical structure patterns 321 of the second refraction unit 320 or the shape of the end of the optical structure pattern itself and the optical structure pattern are mutually irregular. It may be formed as.
  • the first optical sheet 132 increases the luminance in the entire area of the liquid crystal panel (170 of FIG. 1) disposed on the upper part of the second mandrel 320, thereby increasing the luminance. High brightness can be achieved at the viewing angle.
  • the optical structure pattern 321 has a structure having end portions having different heights, it is possible to reduce the size of the area with other optical sheets in direct contact with the first optical sheet 130. As a result, the wet-out phenomenon can be minimized to suppress the generation of moire fringes.
  • the adhesive layer 140 is provided to provide an adhesive force to the bonding of the first optical sheet 130 and the second optical sheet 150, and the adhesive layer 140 is formed on the structured surface of the first optical sheet 110. It may be interposed between one surface of the second optical sheet 150 corresponding thereto.
  • the adhesive layer 140 may be an ultraviolet or visible light curable acrylic adhesive or a two-component curable adhesive used for the lamination of the PVA resin film as the material, but is not particularly limited as long as it is the lamination adhesive of the optical sheet.
  • 15 to 17 show various embodiments of an adhesive layer formed for partial bonding.
  • FIG. 15 illustrates a dot-shaped adhesive layer and an optical sheet applied to an optical sheet structure according to an embodiment of the present invention.
  • the dot-shaped adhesive layer 141 may be formed by being dispersed and formed on the structured surface of the first optical sheet 130 where contact is made.
  • the ratio of the area of the dot-shaped adhesive layer 141 to the entire surface of the structured surface of the first optical sheet 130 and the thickness thereof are the luminance of light emitted from the opposite surface of the structured surface of the first optical sheet 130. It may be adjusted accordingly depending on the quality.
  • FIG. 16 is a view showing a plurality of strip-shaped adhesive layers and optical sheets applied to the surface light source device according to the embodiment of the present invention.
  • one embodiment of the present invention has a plurality of adhesive layers 142 having a band shape disposed on the structured surface of the first optical sheet 130.
  • the plurality of adhesive layers 142 partially bond the second optical sheet 150 and the first optical sheet 130 to each other to provide a firm bonding force.
  • the plurality of adhesive layers 142 having a band shape may be implemented to have a plurality of band shapes arranged parallel to each other at a predetermined interval so that partial bonding may be performed.
  • the plurality of adhesive layers 142 may include a structured surface of the optical sheet 130, that is, a linear prism pattern (eg, 231 and 232 of FIG. 2) or an optical structure pattern (eg, 321 of FIG. 4). It may have a band shape formed extending in the same direction as the formed direction.
  • FIG. 17 is a view showing a mesh-shaped adhesive layer and an optical sheet applied to the surface light source device according to the embodiment of the present invention.
  • one embodiment of the present invention has a mesh-shaped adhesive layer 143 disposed on the structured surface of the optical sheet 130.
  • the mesh adhesive layer 143 is disposed between the second optical sheet 150 and the first optical sheet 130, and the front surface of the second optical sheet 150 and the first optical sheet 130 are not bonded to each other. Is provided in the form of a mesh having an open area (s) so as to partially bond the second optical sheet 150 and the first optical sheet 130.
  • the mesh adhesive layer 142 may be formed in such a manner that a plurality of bands arranged in parallel to each other cross each other.
  • the open region s may be formed by two band shapes arranged in parallel in one direction and two band shapes arranged in parallel in a direction crossing the plurality of band shapes.
  • FIG. 18 is a graph illustrating bonding two prism sheets and measuring luminance of light transmitted while varying the ratio of the thickness of the adhesive layer and the area of the entire optical sheet structure.
  • the reference luminance represents the luminance transmitted through two prism sheets without applying the adhesive layer.
  • the graph shown in FIG. 18 is commonly measured for the above-mentioned dot-shaped partial adhesive layer, strip-shaped partial adhesive layer, and mesh-shaped partial adhesive layer.
  • the luminance decreases as the thickness of the adhesive layer increases.
  • the total area of the adhesive layer is less than 65% of the area occupied by the entire optical sheet structure, it can be seen that the decrease in brightness due to the increase in thickness is significantly slowed down.
  • the area of the adhesive layer is preferably 5% or more and 65% or less of the area of the area where the light guide plate and the optical sheet are bonded, that is, the planar area of the optical sheet, so as to provide a deterioration phenomenon due to the adhesive layer and an appropriate bonding force.
  • a shading phenomenon may occur that occurs a region appearing darker than the surroundings. This shading phenomenon is undesirable because it prevents providing uniform light over the entire area of the display system.
  • This shading phenomenon mainly depends on the width of the dot or strip shape forming the partial junction and the prism pattern pitch of the first optical sheet. Table 1 shows a case where the light transmitted while changing the diameter of the dot and the prism pitch of the first optical sheet is visually observed when the dot-shaped adhesive layer is applied, and the shading phenomenon is not observed. If not, the result is indicated by an X table.
  • Tables 2 and 3 show O tables and shadings in which the transmitted light is visually observed while varying the width of the adhesive layer and the prism pitch of the first optical sheet in the band-shaped and mesh-shaped adhesive layers, respectively. It is the result which showed with the X table
  • the lower limit of the dot diameter of the adhesive layer in relation to the shading phenomenon is not limited to a specific value.
  • the dot-shaped adhesive layer is positioned between two peaks of the prism structure. In view of the fact that the adhesive force may be reduced by not contacting the adhesive layer with the peak portion of the prism structure, the adhesive layer dot diameter is preferably formed larger than the prism pitch.
  • the width of the adhesive layer is formed larger than the pitch of the prism pattern, and the upper limit thereof is preferably less than 10 times the pitch of the prism pattern.
  • the width of the adhesive layer that is, the width of the band structures that cross each other to form a mesh-shaped adhesive layer is less than 10 times the prism pattern pitch. It can be seen that it is preferable.
  • belt structure which mutually intersects to form a mesh-shaped adhesive layer is not limited to a specific value, It can determine suitably in consideration of the area ratio of the above-mentioned preferable adhesive layer.
  • embodiments of the present invention provide an adhesive layer only on a portion of a surface to be bonded to secure adhesion between the first optical sheet 130 having the structured surface and the second optical sheet 150 laminated to the structured surface. To form a partial junction. As a result, it is possible to secure a firm bonding force between the light guide plate and the optical sheet and to minimize variations in optical characteristics due to the application of the adhesive layer.
  • various embodiments of the present invention allow optical structures formed on the structured surface of the first optical sheet 130 to form regions having different heights, thereby directly contacting the structured surface of the first optical sheet 130. By reducing the area, it is possible to reduce the infiltration phenomenon and to suppress the generation of moire fringes.
  • embodiments of the invention can suppress problems such as warpage, deformation, and warpage that may occur when applying an ultra-thin optical sheet (prism sheet) by providing a proper bonding force by partial bonding. Through this, the thickness of the entire backlight unit can be reduced by enabling the use of a thinner optical sheet.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne une structure de feuille optique grâce à laquelle plus d'un certain niveau de robustesse peut être assuré par maintien de la force d'adhérence entre des feuilles optiques tout en réduisant au minimum la réduction des caractéristiques optiques de la lumière passant au travers. La structure de feuille optique comprend: une première feuille optique comprenant une surface supérieure au niveau de laquelle une structure optique est formée de manière à présenter une surface au niveau de laquelle la partie d'extrémité supérieure est à différentes hauteurs; une couche adhésive qui est formée sur une partie de la surface de la surface supérieure de la première feuille optique; et une seconde feuille optique qui est disposée sur la couche adhésive. La couche adhésive peut se présenter sous la forme d'une pluralité de points, sous la forme d'une pluralité de bandes ou sous la forme d'une maille présentant des zones ouvertes de manière à permettre une adhésion partielle.
PCT/KR2012/008232 2011-10-11 2012-10-11 Structure de feuille optique WO2013055112A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020110103604A KR20130039127A (ko) 2011-10-11 2011-10-11 광학시트 구조물
KR10-2011-0103604 2011-10-11

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WO2013055112A1 true WO2013055112A1 (fr) 2013-04-18

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Cited By (1)

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US20220317519A1 (en) * 2021-03-30 2022-10-06 Probright Technology Inc. Optical film structure

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KR20150002309A (ko) * 2013-06-28 2015-01-07 제일모직주식회사 복합광학시트 및 이를 포함하는 백라이트 유닛

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JP2009265318A (ja) * 2008-04-24 2009-11-12 Dainippon Printing Co Ltd 光学部材、面光源装置、透過型表示装置
KR20110055018A (ko) * 2009-11-19 2011-05-25 주식회사 엘엠에스 통합형 광학 시트 및 이를 포함하는 광학장치

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US20220317519A1 (en) * 2021-03-30 2022-10-06 Probright Technology Inc. Optical film structure
US11537006B2 (en) * 2021-03-30 2022-12-27 Probright Technology Inc. Optical film structure

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