WO2014209032A1 - Élément optique et unité de rétroéclairage le comprenant - Google Patents

Élément optique et unité de rétroéclairage le comprenant Download PDF

Info

Publication number
WO2014209032A1
WO2014209032A1 PCT/KR2014/005683 KR2014005683W WO2014209032A1 WO 2014209032 A1 WO2014209032 A1 WO 2014209032A1 KR 2014005683 W KR2014005683 W KR 2014005683W WO 2014209032 A1 WO2014209032 A1 WO 2014209032A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
optical member
particles
layer
diffusion sheet
Prior art date
Application number
PCT/KR2014/005683
Other languages
English (en)
Korean (ko)
Inventor
김경종
남시욱
신진호
김경화
Original Assignee
코오롱인더스트리 주식회사
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 코오롱인더스트리 주식회사 filed Critical 코오롱인더스트리 주식회사
Publication of WO2014209032A1 publication Critical patent/WO2014209032A1/fr

Links

Images

Classifications

    • 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
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • 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

Definitions

  • the present invention relates to an optical member used in a liquid crystal display and a backlight unit including the same.
  • a liquid crystal display used as an optical display element is an indirect light emission method of controlling the transmittance of an external light source to display an image, and a backlight unit, which is a light source device, is used as an important component for determining characteristics of a liquid crystal display.
  • the backlight unit sequentially passes the light emitted using a light source such as a light emitting diode (LED) through the light guide plate, the diffusion sheet, and the prism sheet to reach the liquid crystal panel.
  • a light source such as a light emitting diode (LED)
  • the light guide plate is mounted in the case of an edge type backlight unit, and transmits the light emitted from the light source to be distributed over the front surface of the liquid crystal panel in a flat shape, and a diffusion member such as a diffusion sheet obtains uniform light intensity across the entire screen.
  • a device such as a light source mounted to the lower part of the diffusion member so as to be hidden from the front.
  • the prism sheet performs a light path control function for converging light rays from various directions passing through the diffusion member within a range of viewing angle ⁇ suitable for the viewer to recognize the image to be collected.
  • the lower portion of the light guide plate is provided with a reflective sheet for increasing the use efficiency of the light source by being able to reflect the light that is not delivered to the liquid crystal panel off the path again.
  • the prism sheet has a triangular array structure having a 45 ° inclined surface for improving the brightness in the front direction. Therefore, since the angles emitted from the same type of prism are the same for each array, even if a small crush occurs at the corners of the triangle or minute scratches occur on the inclined surface, the defects are caused by the difference in the light paths emitted between the damaged parts and the normal parts. Will be processed. Therefore, fine foreign matters are not allowed in the production of the prism sheet, and in some cases, even the minute defects make it impossible to use the entire surface of the produced prism sheet. This leads to a decrease in productivity, which in turn is a burden of cost increase. In addition, when laminating the work on the backlight unit, several laminations are performed by manpower. The prism sheet also requires considerable attention when working by hand, and the back light unit is increased due to the increase in the TACT time required for assembling the backlight unit and the supply of manpower. This will lead to an increase in the supply cost.
  • a light collecting sheet is manufactured using a lens having a hemispherical cross-section instead of a prism.
  • the lens and the substrate reach the apex of the lens, the light collecting efficiency decreases, so that the effect of improving the brightness is limited. There was no.
  • An object of the present invention is to provide an optical member having an improved viewing angle and a backlight unit including the same.
  • the present invention is a first preferred embodiment, the first diffusion sheet; A second diffusion sheet stacked on the first diffusion sheet; And a composite optical sheet laminated on the second diffusion sheet, wherein the composite optical sheet comprises: a base layer; A structure layer formed on an upper surface of the substrate layer, the longitudinal cross section having a lenticular pattern arranged in an isosceles triangle having a curved mountain portion; And it is formed on the lower surface of the base layer, and provides an optical member comprising a back coating layer in which particles are dispersed.
  • the triangular cross section in which the mountain portion is curved according to the embodiment may have a height / pitch (H / P) of 0.4 or less.
  • the triangular cross section of the curved portion of the mountain according to the embodiment may have a pitch of 5 ⁇ 20 ⁇ m.
  • the triangular cross section of the curved portion of the mountain according to the embodiment may have a curvature (round) of 5 ⁇ m ⁇ 14 ⁇ m.
  • the structural layer according to the embodiment may have a refractive index (R.I.) of 1.47 to 1.55.
  • the back coating layer according to the embodiment may include 2 to 10 parts by weight of particles with respect to 100 parts by weight of the binder resin.
  • the back coating layer according to the embodiment may include 2 to 10 parts by weight of particles selected from organic particles, inorganic particles and mixtures thereof with respect to 100 parts by weight of the binder resin.
  • the present invention also provides a backlight unit including the optical member as a second preferred embodiment.
  • the optical member according to the present invention exhibits an excellent concealability and an improved viewing angle.
  • FIG. 1 is a longitudinal sectional view of a composite optical sheet according to the present invention.
  • Figure 2 shows a top view (a), a longitudinal cross-sectional view (b) and a perspective view (c) of the composite optical sheet structure layer according to the present invention.
  • Figure 3 schematically shows a longitudinal section of the lenticular pattern formed on the composite optical sheet structure layer according to the present invention.
  • Figure 4 shows a bottom view (a), a longitudinal cross-sectional view (b) and a perspective view (c) of the composite optical sheet back coating layer according to the present invention.
  • Example 5 is a graph showing measurement results of left and right viewing angles (a) and up and down viewing angles (b) of the sheets of Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.
  • Example 6 is a photograph taken whether the side lobe of the sheet of Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.
  • the present invention is a first diffusion sheet (1); A second diffusion sheet 2 stacked on the first diffusion sheet 1; And a composite optical sheet 3 laminated on the second diffusion sheet 2, wherein the composite optical sheet comprises: a base layer 10; A structural layer 20 formed on an upper surface of the substrate layer, the longitudinal cross section having a lenticular pattern arranged in an isosceles triangle having a curved mountain portion; And a back coating layer 30 formed on a lower surface of the base layer 10 and having particles dispersed therein (FIG. 1).
  • the composite optical sheet ensures concealment of the viewing angle.
  • the viewing angle can be improved.
  • the isosceles triangle of the composite optical sheet is a part that acts like a prism and not only focuses the light in front, but also widens the left and right viewing angles to increase the half-angle angle than the existing diffusion sheet, and the curve of the vertex of the isosceles triangle scatters the light. It improves side lobe of vertical angle, which is a problem of concealment and composite prism sheet.
  • a back coating on the back to secure additional concealment, the same appearance as the diffusion sheet.
  • the base layer may be a resin selected from the group consisting of polyethylene terephthalate resin, polymethyl methacrylate resin, polycarbonate resin, polypropylene resin, polyethylene resin, polystyrene resin and styrene-acrylic copolymer resin, but the composite optical
  • the resin is not limited so long as it can exhibit properties such as durability of the sheet.
  • the structure layer is not particularly limited as long as the material is a light-transmissive curable resin. That is, any polymer resin containing ultraviolet curable resin or thermosetting resin can be used without limitation. Examples thereof include unsaturated fatty acid esters, aromatic vinyl compounds, unsaturated fatty acids and their derivatives, unsaturated dibasic acids and their derivatives, meta, and the like. Vinyl cyanide compounds such as chloronitrile and the like can be used.
  • the structural layer may have a refractive index (RI) of 1.47 to 1.55, and if the refractive index of the structural layer is less than 1.47, there is a problem of deterioration in luminance, and if the structure layer is more than 1.55, the price is increased, and the structure layer is manufactured. High viscosity may cause problems in improving mass productivity.
  • RI refractive index
  • the structural layer has a lenticular pattern whose shape of the longitudinal section is an isosceles triangle with a curved mountain part (FIG. 2A), and the shape of the longitudinal section of the structural layer pattern may be an isosceles triangle with a curved mountain part. ((B) and (c) of FIG. 2). At this time, the angles of the two vertices contacting the base of the isosceles triangle may be 45 degrees, respectively.
  • the triangular cross section of the mountain portion is curved may have a height / pitch (H / P) of 0.4 or less, preferably 0.2 to 0.4. If the height / pitch is greater than 0.4, there is a problem that the side lobe occurs in the vertical angle, and if less than 0.2, the luminance is reduced.
  • the peak of the triangle cross section of the curved portion may have a pitch of 5 ⁇ 20 ⁇ m, if the pitch is less than 5 when producing a pattern roll processing machine to secure the quality of the optical sheet by the generation of white spots and S / C becomes difficult. If the thickness is more than 20 ⁇ m, the amount of the resin required for fabricating the structural layer increases, thereby increasing the price (FIG. 3).
  • the curvature may be 5 ⁇ 14 ⁇ m, if the curvature is less than 5 ⁇ m Side Lobe occurs at the upper and lower angle, and if it exceeds 14 ⁇ m brightness is reduced.
  • the curvature means a radius r of a circle having a curve of a triangular cross section in which the peak is curved.
  • the back coating layer may be a binder resin in which the material is dispersed.
  • the binder resin is a transparent organic binder resin, it is possible to use a resin having good adhesion to the substrate layer and good compatibility with the particles, unsaturated polyester, methyl methacrylate, ethyl methacrylate, iso Butyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, methirol acryl Acrylic resins selected from the group consisting of amide, glycidyl methacrylate and ethyl acrylate; Urethane-based resins; Epoxy resins; And melamine-based resins.
  • the particles are methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, ethyl acrylate, iso
  • the particles are silicon oxide; Aluminum oxide; Titanium oxide; Zirconium oxide; And it may be an inorganic particle made of one or more materials selected from the group consisting of
  • the back coating layer may include 2 to 10 parts by weight of particles with respect to 100 parts by weight of the binder resin as described above, if the content of the particles is less than 2 parts by weight, the concealability is lowered, if more than 10 parts by weight to ensure the concealability Is advantageous, but a decrease in luminance occurs.
  • the back coating layer may have a shape in which the particles protrude, and when the protrusion of the particles is large, it may cause damage to the sheet laminated by the protruding particles, so that the protruding portion of the particles does not exceed 50% of the particle diameter. It may be protruding (FIG. 4).
  • the diameter of the particles may be 2 ⁇ 5um, if the diameter of the particles less than 2um buried in the Bineder is not secured, and if more than 5um may cause damage to the sheet when the sheet is laminated.
  • a back coating layer is formed by applying a particle dispersion layer made of a binder resin and particles to one surface of the substrate layer, and a composite layer is formed on the back surface of the substrate layer by using a curable resin. Sheets can be produced.
  • a back coating layer is formed on the back layer of the sheet, and a structural layer in which a lenticular pattern is arranged on the front layer of the sheet is formed to secure concealment and improve the viewing angle.
  • a structural layer in which a lenticular pattern is arranged on the front layer of the sheet is formed to secure concealment and improve the viewing angle. Can be.
  • each of the first diffusion sheet and the second diffusion sheet includes a substrate layer and a diffusion layer formed on at least one surface of the substrate layer, and any diffusion sheet used in the art may be used without limitation.
  • the present invention also relates to a backlight unit including the optical member as described above, and is suitable for applying to a monitor to improve the viewing angle.
  • the polyethylene terephthalate film (Kolon Industries) of 100 micrometers was prepared.
  • the back coating layer crude liquid was applied to the lower surface of the base layer by using gravure, and thermally cured at 100 ° C. for 30 seconds, the maximum thickness of which the particles protruded was 6 ⁇ m, and the thickness of the resin containing no particles was 4 ⁇ m.
  • the back coating layer was formed as much as possible.
  • the back coating layer crude liquid is prepared by dispersing 4 parts by weight of PMMA particles in 100 parts by weight of an acrylic binder resin.
  • urethane acrylate Miwon Special Chemical, Miramer MU3603
  • phenoxyethyl acrylate Sartomer, SR339
  • the base layer on which the back coating layer was not formed was coated on the back side of the structure layer forming composition, placed on the frame of the lenticular pattern roller, and described on an ultraviolet irradiation device (Fusion, 600W / inch2) equipped with a Type-D bulb.
  • an ultraviolet irradiation device Fusion, 600W / inch2
  • a lenticular pattern was formed in a linear array to prepare a composite optical sheet.
  • the shape of the mold is a lenticular pattern having a triangular longitudinal cross-section of the peak as shown in Table 1, the pitch of the longitudinal cross-section was 20um, a composite optical sheet having a height of 7.5um was prepared.
  • the composite optical sheet was laminated on the two diffusion sheets to prepare an optical member.
  • An optical member was manufactured in the same manner as in Example 1, except that the longitudinal pitch of the lenticular pattern formed on the structural layer was 10 ⁇ m and the height was 3.8 ⁇ m.
  • An optical member was manufactured in the same manner as in Example 1 except that the longitudinal section pitch of the lenticular pattern formed on the structural layer was 30 ⁇ m and the height was 11.7 ⁇ m.
  • An optical member was manufactured in the same manner as in Example 1, except that a diffusion sheet (XC210, Kolon Industries) was used instead of the composite optical sheet.
  • An optical member was manufactured in the same manner as in Example 1, except that a composite prism sheet (LF343, Kolon Industries) was used instead of the composite optical sheet.
  • a composite prism sheet LF343, Kolon Industries
  • the longitudinal section pitch of the lenticular pattern formed in the structural layer is 20 ⁇ m, except that the height is 9.5 ⁇ m.
  • An optical member was manufactured in the same manner as in Example 1.
  • An optical member was manufactured in the same manner as in Example 1, except that the longitudinal pitch of the lenticular pattern formed on the structural layer was 20 ⁇ m and the height was 3.4 ⁇ m.
  • the optical members manufactured in Examples and Comparative Examples were mounted and fixed on a 21.5 inch backlight unit (BLU) for a liquid crystal display panel, and fixed at 13 points by using a luminance meter (model name: BM-7A, Japan TOPCON). Luminance and color coordinates were measured, and the luminance ratio was recorded as a ratio with the luminance of the measured luminance comparative example 1, and the color coordinates recorded an average of 13 points.
  • BLU backlight unit
  • the optical members manufactured in Examples and Comparative Examples were mounted and fixed on a 21.5 inch backlight unit (BLU) for the liquid crystal display panel, and faced at the front of the BLU using a luminance meter (model name: BM-7A, Japan TOPCON).
  • BLU backlight unit
  • BM-7A BM-7A, Japan TOPCON
  • the light emitting members prepared in Examples and Comparative Examples were mounted and fixed on a backlight unit for a 21.5-inch liquid crystal display panel, and were mounted at -80 degrees to 80 degrees in the vertical direction using a luminance meter (model name: BM-7A, Japan TOPCON).
  • the luminance is measured at intervals of 5 degrees in the range of degrees, and when the luminance rises in the range of the viewing angle of -50 degrees or less or 50 degrees or more, the side lobe is generated.
  • Example 1 Longitudinal section of the composite optical sheet structure layer (triangular with a curved mountain) Pitch (P, ⁇ m) Height (H, ⁇ m) Height / Pitch (H / P) Curvature ( ⁇ m)
  • Example 1 20 7.5 0.38 6
  • Example 2 10 3.8 0.38 3
  • Example 3 30 11.7 0.39 8
  • Comparative Example 1 Diffusion Prism Sheet (XC210, Kolon Industries) Comparative Example 2 Composite Prism Sheet (LF343, Kolon Industries) Comparative Example 3 20 9 0.46 2 Comparative Example 4 20 3.4 0.17 16

Landscapes

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

Abstract

La présente invention concerne un élément optique et une unité de rétroéclairage le comprenant et, plus particulièrement, un élément optique offrant un angle de visualisation amélioré et une unité de rétroéclairage le comprenant, l'élément optique comprenant : une première feuille de diffusion ; une seconde feuille de diffusion empilée sur la première feuille de diffusion ; et une feuille optique complexe empilée sur la seconde feuille de diffusion. La feuille optique complexe comprenant : une couche de base ; une couche structurelle qui est formée sur la surface supérieure de la couche de base et qui comporte un motif lenticulaire dont la section longitudinale a la forme d'un triangle équilatéral à sommet arrondi ; et une couche de revêtement arrière qui est formée sur la surface inférieure de la couche de base et dans laquelle sont dispersées des particules.
PCT/KR2014/005683 2013-06-28 2014-06-26 Élément optique et unité de rétroéclairage le comprenant WO2014209032A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2013-0075003 2013-06-28
KR1020130075003A KR20150001919A (ko) 2013-06-28 2013-06-28 광학부재 및 이를 포함하는 백라이트 유닛

Publications (1)

Publication Number Publication Date
WO2014209032A1 true WO2014209032A1 (fr) 2014-12-31

Family

ID=52142282

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2014/005683 WO2014209032A1 (fr) 2013-06-28 2014-06-26 Élément optique et unité de rétroéclairage le comprenant

Country Status (2)

Country Link
KR (1) KR20150001919A (fr)
WO (1) WO2014209032A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090022171A (ko) * 2007-08-29 2009-03-04 주식회사 나노옵틱스 확산 기능을 갖는 휘도향상 광학시트
KR20110005458A (ko) * 2009-07-10 2011-01-18 주식회사 상보 다중 곡률을 갖는 광학시트
JP2011081166A (ja) * 2009-10-07 2011-04-21 Toppan Printing Co Ltd Ｅｌパネル及びそれを用いた照明装置、及びそれを用いた表示装置
JP2011247947A (ja) * 2010-05-24 2011-12-08 Dainippon Printing Co Ltd 光学シート、面光源装置、表示装置
KR20130035537A (ko) * 2011-09-30 2013-04-09 엘지디스플레이 주식회사 액정 표시 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090022171A (ko) * 2007-08-29 2009-03-04 주식회사 나노옵틱스 확산 기능을 갖는 휘도향상 광학시트
KR20110005458A (ko) * 2009-07-10 2011-01-18 주식회사 상보 다중 곡률을 갖는 광학시트
JP2011081166A (ja) * 2009-10-07 2011-04-21 Toppan Printing Co Ltd Ｅｌパネル及びそれを用いた照明装置、及びそれを用いた表示装置
JP2011247947A (ja) * 2010-05-24 2011-12-08 Dainippon Printing Co Ltd 光学シート、面光源装置、表示装置
KR20130035537A (ko) * 2011-09-30 2013-04-09 엘지디스플레이 주식회사 액정 표시 장치

Also Published As

Publication number Publication date
KR20150001919A (ko) 2015-01-07

Similar Documents

Publication Publication Date Title
KR100980072B1 (ko) 광학용 복합 필름
KR101184449B1 (ko) 패턴 도광판, 그 제조방법 및 이를 이용한 액정표시장치 백라이트 유닛
US20100085735A1 (en) Optical sheets
US20090316269A1 (en) Optical sheets
US20090311486A1 (en) Optical sheets
KR100909427B1 (ko) 광제어 필름
KR101087026B1 (ko) 광학용 복합 필름
WO2009151217A2 (fr) Feuille optique, ensemble de rétroéclairage et dispositif d'affichage à cristaux liquides comprenant la feuille optique
US20100055409A1 (en) Optical composite and method of manufacturing the same
KR20110011931A (ko) 집광형 광학 시트
KR100980068B1 (ko) 광학용 복합 필름
WO2014209032A1 (fr) Élément optique et unité de rétroéclairage le comprenant
KR100988764B1 (ko) 광학용 복합 필름
KR101233533B1 (ko) 광확산 부재를 포함하는 백라이트 유닛 어셈블리
WO2014185734A1 (fr) Feuille optique composite et dispositif d'affichage optique la comprenant
KR101370167B1 (ko) 백라이트 유닛 어셈블리
KR101036357B1 (ko) 광보정 부재
KR100936063B1 (ko) 광확산 부재
KR20130002757A (ko) 휘도가 향상된 광학필름
KR20120033902A (ko) 집광형 광학 시트
KR100902156B1 (ko) 광제어 필름
WO2008082248A1 (fr) Composite optique et son procédé de fabrication
KR100906984B1 (ko) 백라이트 유닛 어셈블리
WO2013100482A1 (fr) Plaque de guidage de lumière et unité de rétroéclairage la comprenant
KR20160052972A (ko) 광학시트 및 이를 포함하는 광학 디스플레이 장치

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14818586

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14818586

Country of ref document: EP

Kind code of ref document: A1