WO2022097993A1 - Film optique pour améliorer le rapport de contraste - Google Patents

Film optique pour améliorer le rapport de contraste Download PDF

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Publication number
WO2022097993A1
WO2022097993A1 PCT/KR2021/015296 KR2021015296W WO2022097993A1 WO 2022097993 A1 WO2022097993 A1 WO 2022097993A1 KR 2021015296 W KR2021015296 W KR 2021015296W WO 2022097993 A1 WO2022097993 A1 WO 2022097993A1
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WO
WIPO (PCT)
Prior art keywords
refractive index
optical film
relative luminance
layer
high refractive
Prior art date
Application number
PCT/KR2021/015296
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English (en)
Korean (ko)
Inventor
김성수
백성호
Original Assignee
동우 화인켐 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 동우 화인켐 주식회사 filed Critical 동우 화인켐 주식회사
Priority to CN202180074622.7A priority Critical patent/CN116457707A/zh
Priority to JP2023524674A priority patent/JP2023548053A/ja
Publication of WO2022097993A1 publication Critical patent/WO2022097993A1/fr

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Classifications

    • 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
    • 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
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • 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
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G02F1/133507—Films for enhancing the luminance
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Definitions

  • the present invention relates to an optical film. Specifically, the present invention relates to an optical film capable of improving a viewing angle by increasing side brightness.
  • the liquid crystal display operates by emitting light from the backlight unit through the liquid crystal panel.
  • luminance and contrast ratio are high on the front side of the screen, but luminance and contrast ratio are low on the side surface.
  • the bright and dark parts of the screen can be expressed in detail only when the contrast ratio is high, and as a result, excellent image quality can be realized.
  • the liquid crystal display device may include a laminate having a structure in which a first polarizing plate, a liquid crystal panel, and a second polarizing plate are stacked.
  • the first polarizer may be coupled to a lower portion of the liquid crystal panel to polarize incident light.
  • the liquid crystal panel is coupled between the first polarizing plate and the second polarizing plate to transmit light incident from the first polarizing plate to the second polarizing plate, and may include a liquid crystal layer as a display medium.
  • the second polarizing plate is coupled to the upper portion of the liquid crystal panel to polarize and diffuse light passing through the liquid crystal panel, thereby increasing the luminance and contrast ratio of the side surface.
  • the second polarizing plate may have a structure in which a polarizer, an optical film, a protective layer, and the like are stacked.
  • FIGS. 1A and 1B are cross-sectional views showing a conventional optical film used for a polarizing plate.
  • the conventional optical films 110 and 120 may be configured by laminating high refractive index layers 111 and 121 and low refractive index layers 112 and 122 .
  • the high refractive index layers 111 and 121 may have a recessed engraved pattern.
  • the engraved pattern includes inclined portions S1 and S2 between the depressed flat portions F1 and F2 and one surface of the high refractive index layers 111 and 121 .
  • the inclined portions S1 and S2 are configured in a straight line form S1 as shown in FIG. 1A .
  • the inclined portions S1 and S2, as shown in FIG. 1B are recessed (bent) from the low refractive layer 122 to the high refractive index layer 121, that is, are formed of a recessed curved inclined portion S2.
  • the intaglio pattern may have a long width of 10 to 20 ⁇ m and a short width of 5 to 15 ⁇ m.
  • the front relative luminance may be 92% or more of the front luminance before laminating the optical film, and the 60° side relative luminance may be 14% or more of the front relative luminance.
  • the high refractive layer may have a refractive index of 1.57 to 1.70, and the low refractive layer may have a refractive index of 1.42 to 1.50.
  • the refractive index difference between the high refractive index layer and the low refractive index layer may be 0.07 to 0.28.
  • the polarizing plate according to the present invention may include the optical film for improving the contrast ratio described above.
  • a curved inclined portion is formed in the engraved pattern of the high refractive index layer, but is curved while protruding from the high refractive index layer to the low refractive index layer, that is, it is configured in a protruding curved surface inclined portion.
  • the present invention can maximize the 60° side relative luminance while minimizing the deterioration of the frontal relative luminance compared to the prior art in which the inclined portion of the intaglio pattern is configured as a straight line or a recessed curved surface inclined.
  • FIG. 2 is a cross-sectional view showing an optical film according to the present invention.
  • the high refractive index layer 211 may form an intaglio pattern RP on a surface opposite to the low refractive index layer 212 .
  • the engraved pattern RP may include a depressed flat portion F3 and a protruding curved inclined portion S3 .
  • the depression flat portion F3 is formed by being depressed to a predetermined depth D in the central region of the intaglio pattern RP.
  • the depression flat portion F3 may be formed in parallel with one surface of the high refractive index layer 211 (a surface coupled to the low refractive index layer 212 in FIG. 2 ).
  • the protruding curved inclined portion S3 may be formed while obliquely connecting both ends of the concave flat portion F3 and one surface of the high refractive index layer 211 (the surface coupled to the low refractive index layer 212 in FIG. 2 ).
  • the protruding curved inclined portion S3 may be formed as a curved protruding (or curved) shape in a direction from the high refractive index layer 211 to the low refractive index layer 212 , that is, a protruding curved inclined portion.
  • the engraved pattern (RP) is known to have a large light diffusion effect when the long width (LW) and the short width (SW) are 5 to 20 ⁇ m and the depth (D) is 5 to 15 ⁇ m. Accordingly, in the present invention, the long width (LW) can be set to 10 to 20 ⁇ m, the short width (SW) to 5 to 15 ⁇ m, and the depth (D) can be set first to 5 to 15 ⁇ m.
  • the engraved pattern RP may be formed to be spaced apart from each other.
  • the low refractive index layer 212 may be coupled to one surface (lower surface in FIG. 2 ) of the high refractive index layer 211 while filling (or burying) the intaglio pattern RP of the high refractive index layer 211 .
  • the low refractive index layer 212 may be formed of an ultraviolet curable transparent resin, for example, (meth)acrylic, polycarbonate, silicone, or epoxy resin.
  • the low refractive layer 212 may have a refractive index of 1.42 to 1.50.
  • Table 1 below shows that the front relative luminance and the 60° side relative luminance change according to the shape change of the intaglio pattern (RP).
  • the high refractive index layer 211 used an acrylic resin having a refractive index of 1.58.
  • the low refractive index layer 212 used an epoxy resin having a refractive index of 1.44.
  • the intaglio pattern (RP) had a long width (LW) of 10 ⁇ m, a short width (SW) of 5 ⁇ m, a depth (D) of 15 ⁇ m, and a period (T) of 29 ⁇ m. While changing the radius of curvature R of the protruding curved inclined portion S3, the front relative luminance and the 60° side relative luminance were measured.
  • the inclined portion S3 according to the present invention in order to compare the technical effects of the protruding curved inclined portion S3 according to the present invention and the conventional inclined portion (straight line, recessed curved surface inclined), the inclined portion according to the prior art (straight line, recessed curved surface inclined) also , the front relative luminance and the 60° side relative luminance were measured.
  • the relative luminance of the front exceeded 92% in some experimental examples, but did not exceed 14% in all of the relative luminance of the 60° side.
  • the frontal relative luminance exceeds 92% at a radius of curvature (R) of 50 to 150 ⁇ m, and when the radius of curvature (R) is 30 to 150 ⁇ m, a 60° side relative luminance is 14 % was measured.
  • the radius of curvature R of the protruding curved inclined portion S3 in the present invention is preferably limited to 50 to 150 ⁇ m. This limitation of the radius of curvature R may have a technical meaning.
  • Table 2 below shows the results of measuring the front relative luminance and 60° side relative luminance while changing the radius of curvature (R) of the protruding curved inclined part (S3) after making the shape of the intaglio pattern (RP) different from Table 1 above. is showing Here, the high refractive index layer 211 and the low refractive index layer 212 used the same material as in Table 1 above.
  • the intaglio pattern (RP) had a long width (LW) of 15 ⁇ m, a short width (SW) of 10 ⁇ m, a depth (D) of 15 ⁇ m, and a period (T) of 29 ⁇ m.
  • the front surface of the conventional inclined portion (straight, depressed curved surface inclined) Relative luminance and 60° side relative luminance were measured.
  • the front relative luminance exceeded 92% in some experimental examples, but it was measured that all of them did not exceed 14% in the 60° side relative luminance.
  • the front relative luminance exceeds 92% at a radius of curvature (R) of 50 to 150 ⁇ m, and the radius of curvature (R) is 30 to At 150 ⁇ m, the 60° side relative luminance was measured to exceed 14%.
  • the radius of curvature (R) of the protruding curved surface in the protruding curved inclined portion (S3) of the present invention is 50 to It is preferable to limit it to 150 micrometers.
  • Table 3 below shows the front relative luminance and 60° side relative luminance while changing the radius of curvature (R) of the protruding curved inclined part (S3) after making the shape of the intaglio pattern (RP) different from Tables 1 and 2 above.
  • the high refractive index layer 211 and the low refractive index layer 212 used the same material as in Table 1 above.
  • the intaglio pattern (RP) had a long width (LW) of 20 ⁇ m, a short width (SW) of 15 ⁇ m, a depth (D) of 15 ⁇ m, and a period (T) of 29 ⁇ m.
  • the intaglio pattern (RP) is preferably composed of an inclined portion with a protruding curved surface inclined.
  • the radius of curvature R of the protruding curved surface is preferably configured to be 50 to 150 ⁇ m.
  • the high refractive layer 211 may be used as a material having a refractive index of 1.57 to 1.70.
  • the optical film of the present invention may use the low-refractive layer 212 as a material having a refractive index of 1.42 to 1.50.
  • the refractive index difference between the high refractive index layer 211 and the low refractive index layer 212 may be 0.07 to 0.28.
  • FIG 3 is a cross-sectional view showing a modified example of the optical film according to the present invention.
  • the deformable optical film 220 fills the low refractive index layer 212 only inside the intaglio pattern RP of the high refractive index layer 211 and one surface of the high refractive index layer 211 (the lower surface in FIG. 3 ). ) may be configured in a form in which the low refractive layer 212 is not coupled. By doing so, the deformable optical film 220 can minimize the thickness. As a result, it can contribute to thinning of a display device.
  • the optical film described above can be used as part of a polarizing plate.
  • the polarizing plate may have, for example, a structure in which the above-described optical film is inserted and laminated between the polarizer film and the protective film.
  • optical film described above may be used in various display devices, for example, a plasma panel, an electroluminescent panel, an organic light emitting diode panel, etc. in addition to the liquid crystal panel.

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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)
  • Optical Elements Other Than Lenses (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un film optique pour améliorer un rapport de contraste comprenant une couche à réfraction élevée ayant une pluralité de motifs gravés espacés sur une surface et une couche à faible réfraction couplée sur une surface de la couche à réfraction élevée tout en remplissant les motifs gravés. Les motifs gravés comprennent une partie plate enfoncée qui est enfoncée dans une région centrale et est formée horizontalement. Les motifs gravés comprennent une partie inclinée incurvée en saillie, qui est inclinée selon une forme incurvée tout en faisant saillie de la couche à réfraction élevée à la couche à faible réfraction, entre la partie plate enfoncée et la surface de la couche à réfraction élevée.
PCT/KR2021/015296 2020-11-04 2021-10-28 Film optique pour améliorer le rapport de contraste WO2022097993A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180074622.7A CN116457707A (zh) 2020-11-04 2021-10-28 对比度改善光学膜
JP2023524674A JP2023548053A (ja) 2020-11-04 2021-10-28 コントラスト比改善の光学フィルム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020200145763A KR20220060154A (ko) 2020-11-04 2020-11-04 명암비 개선 광학 필름
KR10-2020-0145763 2020-11-04

Publications (1)

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WO2022097993A1 true WO2022097993A1 (fr) 2022-05-12

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PCT/KR2021/015296 WO2022097993A1 (fr) 2020-11-04 2021-10-28 Film optique pour améliorer le rapport de contraste

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JP (1) JP2023548053A (fr)
KR (1) KR20220060154A (fr)
CN (1) CN116457707A (fr)
WO (1) WO2022097993A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160252665A1 (en) * 2015-02-27 2016-09-01 Samsung Sdi Co., Ltd. Polarizing plate and liquid crystal display comprising the same
KR20170091453A (ko) * 2016-02-01 2017-08-09 삼성에스디아이 주식회사 복합 편광판, 이를 포함하는 액정표시장치용 모듈 및 이를 포함하는 액정표시장치
KR20190113464A (ko) * 2018-03-28 2019-10-08 삼성에스디아이 주식회사 시인성 개선 광학 필름, 이를 포함하는 편광판 및 이를 포함하는 플렉시블 광학표시장치
KR20190133196A (ko) * 2017-04-19 2019-12-02 다이니폰 인사츠 가부시키가이샤 광학 구조체 및 표시 장치
KR20200113625A (ko) * 2019-03-26 2020-10-07 동우 화인켐 주식회사 명암비 개선 필름 및 이를 갖는 디스플레이 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160252665A1 (en) * 2015-02-27 2016-09-01 Samsung Sdi Co., Ltd. Polarizing plate and liquid crystal display comprising the same
KR20170091453A (ko) * 2016-02-01 2017-08-09 삼성에스디아이 주식회사 복합 편광판, 이를 포함하는 액정표시장치용 모듈 및 이를 포함하는 액정표시장치
KR20190133196A (ko) * 2017-04-19 2019-12-02 다이니폰 인사츠 가부시키가이샤 광학 구조체 및 표시 장치
KR20190113464A (ko) * 2018-03-28 2019-10-08 삼성에스디아이 주식회사 시인성 개선 광학 필름, 이를 포함하는 편광판 및 이를 포함하는 플렉시블 광학표시장치
KR20200113625A (ko) * 2019-03-26 2020-10-07 동우 화인켐 주식회사 명암비 개선 필름 및 이를 갖는 디스플레이 장치

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Publication number Publication date
KR20220060154A (ko) 2022-05-11
CN116457707A (zh) 2023-07-18
JP2023548053A (ja) 2023-11-15

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