WO2022097993A1 - Optical film for improving contrast ratio - Google Patents

Optical film for improving contrast ratio Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
refractive index
optical film
relative luminance
layer
high refractive
Prior art date
Application number
PCT/KR2021/015296
Other languages
French (fr)
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/en
Priority to JP2023524674A priority patent/JP2023548053A/en
Publication of WO2022097993A1 publication Critical patent/WO2022097993A1/en

Links

Images

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

Landscapes

  • 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

An optical film for improving a contrast ratio comprises a high refractive layer having a plurality of spaced apart engraved patterns on one surface and a low refractive layer coupled on one surface of the high refractive layer while filling the engraved patterns. The engraved patterns include a depressed flat portion which is depressed in a central region and is formed horizontally. The engraved patterns include a protruding curved inclined portion, which is inclined in a curved shape while protruding from the high refractive layer to the low refractive layer, between the depressed flat portion and the one surface of the high refractive layer.

Description

명암비 개선 광학 필름Contrast improvement optical film
본 발명은 광학 필름에 관한 것이다. 상세하게는, 본 발명은 측면 휘도를 높여 시야각을 개선할 수 있는 광학 필름에 관한 것이다.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.
액정 표시장치는 백라이트 유닛에서 나온 광이 액정 패널을 통해 출사됨으로써 작동한다. 액정 표시장치에서, 화면의 정면에서는 휘도(Luminance)와 명암비(Contrast Ratio)가 높지만, 측면에서는 휘도와 명암비가 떨어진다. 표시 장치에서는 명암비가 높아야 화면의 밝고 어두운 부분을 세세히 표현할 수 있고, 그 결과로서 우수한 화질을 구현할 수 있다. The liquid crystal display operates by emitting light from the backlight unit through the liquid crystal panel. In a liquid crystal display, luminance and contrast ratio are high on the front side of the screen, but luminance and contrast ratio are low on the side surface. In the display device, 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.
최근, 액정 표시장치의 화면이 커지면서, 정면 뿐만 아니라 측면 화질도 중요해 지고 있다. 그래서, 화면의 측면에서 높은 휘도와 명암비를 구현하려는 노력이 지속되고 있다. Recently, as the screen of the liquid crystal display becomes larger, image quality from the front as well as the side has become important. Therefore, efforts to realize high luminance and contrast ratio in the aspect of the screen are continuing.
액정 표시장치는 제1 편광판, 액정 패널, 제2 편광판을 적층한 구조의 적층판을 포함할 수 있다. 제1 편광판은 액정 패널의 하부에 결합하여 입사 광을 편광시킬 수 있다. 액정 패널은 제1 편광판과 제2 편광판 사이에 결합하여 제1 편광판으로부터 입사되는 광을 제2 편광판으로 투과시키는 것으로, 표시 매체인 액정층을 포함할 수 있다. 제2 편광판은 액정 패널의 상부에 결합하여 액정패널을 통과하는 광을 편광 및 확산시킴으로써 측면의 휘도, 명암비를 높일 수 있다. 제2 편광판은 편광자, 광학 필름, 보호층 등을 적층한 구조일 수 있다.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.
도 1a,1b는 편광판에 사용되는 종래의 광학 필름을 도시하는 단면도이다. 1A and 1B are cross-sectional views showing a conventional optical film used for a polarizing plate.
도 1a,1b에 도시한 바와 같이, 종래의 광학 필름(110,120)은 고굴절층(111,121)과 저굴절층(112,122)을 적층하여 구성할 수 있다. 고굴절층(111,121)은 함몰 형태의 음각 패턴을 구비할 수 있다. 음각 패턴은 함몰 평탄부(F1,F2)와 고굴절층(111,121)의 일면 사이에 경사부(S1,S2)를 구비하고 있다. 경사부(S1,S2)는, 도 1a의 도시와 같이, 직선 형태(S1)로 구성하고 있다. 또는, 경사부(S1,S2)는, 도 1b의 도시와 같이, 저굴절층(122)에서 고굴절층(121)으로 함몰되는(휘어지는), 즉 함몰 곡면 경사부(S2)로 구성하고 있다.As shown in FIGS. 1A and 1B , 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 . Alternatively, 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.
그런데, 도 1a,1b와 같이, 고굴절층의 음각 패턴을 직선(S1)이나 함몰 곡면 경사부(S2)로 형성하면, 구현 제품(표시 장치)에서 정면 상대 휘도(광학 필름을 결합하지 않은 상태의 정면 휘도를 기준으로 하는 상대 휘도) 및 60° 측면 상대 휘도(정면 상대 휘도를 기준으로 하는 상대 휘도)의 고품질 기준값(정면 상대 휘도는 92% 이상, 60° 측면 상대 휘도는 정면 상대 휘도의 14% 이상)을 충족시키기가 쉽지 않다. 그 결과, 현재 사용되는 표시 장치에서는, 정면 상대 휘도를 90% 이상, 60° 측면 상대 휘도를 13% 이상을 요구하고 있다.By the way, as shown in FIGS. 1A and 1B , when the engraved pattern of the high refractive index layer is formed as a straight line ( S1 ) or a recessed curved inclined portion ( S2 ), the front relative luminance (in the state in which the optical film is not combined) in the implemented product (display device) High-quality reference values (relative luminance relative to the front luminance) and 60° side relative luminance (relative luminance relative to the front relative luminance) of 92% or higher (front relative luminance is 92% or more, 60° side relative luminance is 14% of front relative luminance) above) is not easy to satisfy. As a result, the presently used display device requires 90% or more of the front relative luminance and 13% or more of the 60° side relative luminance.
그렇지만, 현장에서는 광학 필름의 재질이나 음각 패턴 등을 개선하여, 정면 상대 휘도를 92% 이상, 60° 측면 상대 휘도를 14% 이상으로 끌어올리려는 노력을 지속하고 있다.However, in the field, efforts are being made to improve the material and engraving pattern of the optical film to raise the relative luminance of the front to 92% or more and the relative luminance of the 60° side to 14% or more.
본 발명은 광학 필름의 고굴절층에 형성되는 음각 패턴의 형상을 개선하여, 정면 상대 휘도를 92% 이상, 60° 측면 상대 휘도를 14% 이상으로 높이는 것을 목적으로 한다.An object of the present invention is to improve the shape of the intaglio pattern formed on the high refractive index layer of the optical film, and to increase the front relative luminance to 92% or more and the 60° side relative luminance to 14% or more.
이러한 목적을 달성하기 위한 본 발명의 명암비 개선 광학 필름은, 일면에 음각 패턴을 이격시켜 다수를 구비하는 고굴절층과 고굴절층의 일면에서 음각 패턴을 충전하면서 결합하는 저굴절층을 포함할 수 있다.Contrast ratio improvement optical film of the present invention for achieving this object, a low refractive layer coupled while filling the intaglio pattern on one surface of the high refractive index layer and the high refractive layer having a plurality of spaced apart intaglio patterns on one surface may include.
명암비 개선 광학 필름에서, 음각 패턴은 함몰 평탄부와 돌출 곡면 경사부를 포함할 수 있다. 함몰 평탄부는 중앙 영역에 함몰되어 수평으로 형성될 수 있다. 돌출 곡면 경사부는 함몰 평탄부와 고굴절층의 일면 사이에 고굴절층에서 저굴절층으로 돌출하면서 곡면 형태로 경사질 수 있다.In the contrast improvement optical film, the engraved pattern may include a concave flat portion and a protruding curved inclined portion. The depression flat portion may be formed horizontally by being depressed in the central region. The protruding curved inclined portion may be inclined in a curved shape while protruding from the high refractive index layer to the low refractive index layer between the depressed flat portion and one surface of the high refractive index layer.
본 발명의 명암비 개선 광학 필름에서, 돌출 곡면 경사부는 50~150㎛의 곡률반경을 가질 수 있다.In the contrast improvement optical film of the present invention, the protruding curved inclined portion may have a radius of curvature of 50 to 150 μm.
본 발명의 명암비 개선 광학 필름에서, 음각 패턴은 장폭을 10~20㎛, 단폭을 5~15㎛로 구성할 수 있다.In the contrast improvement optical film of the present invention, the intaglio pattern may have a long width of 10 to 20 μm and a short width of 5 to 15 μm.
본 발명의 명암비 개선 광학 필름에서, 정면 상대 휘도는 광학 필름을 적층하기 전 정면 휘도의 92% 이상이고, 60° 측면 상대 휘도는 정면 상대 휘도의 14% 이상일 수 있다.In the contrast improvement optical film of the present invention, 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.
본 발명의 명암비 개선 광학 필름에서, 고굴절층은 1.57~1.70의 굴절률을 갖고, 저굴절층은 1.42~1.50의 굴절률을 가질 수 있다.In the contrast improvement optical film of the present invention, 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.
본 발명의 명암비 개선 광학 필름에서, 고굴절층과 저굴절층의 굴절률 차이는 0.07~0.28일 수 있다.In the contrast improvement optical film of the present invention, the refractive index difference between the high refractive index layer and the low refractive index layer may be 0.07 to 0.28.
본 발명에 따른 편광판은 위에서 설명한 명암비 개선 광학 필름을 포함할 수 있다.The polarizing plate according to the present invention may include the optical film for improving the contrast ratio described above.
본 발명에 따른 표시 장치는 위에서 설명한 편광판을 포함할 수 있다.The display device according to the present invention may include the polarizing plate described above.
이러한 구성을 갖는 본 발명은 고굴절층의 음각 패턴에서 곡면 경사부를 형성하되 고굴절층에서 저굴절층 방향으로 돌출하면서 휘어지는 형태, 즉 돌출 곡면 경사로 구성하고 있다. 이를 통해, 본 발명은 음각 패턴의 경사부를 직선, 함몰 곡면 경사로 구성하는 종래기술에 비교하여 정면 상대 휘도의 악화를 최소화하면서 60° 측면 상대 휘도를 최대화할 수 있다.In the present invention having such a configuration, 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. Through this, 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.
또한, 본 발명은 돌출 곡면 경사부의 곡률반경을 50~150㎛로 구성하고 있다. 이를 통해, 본 발명은 정면 상대 휘도를 92% 이상, 60° 측면 상대 휘도를 14% 이상으로 높일 수 있다. 그 결고, 본 발명은 정면 상대 휘도 및 60° 측면 상대 휘도의 고품질 기준값을 만족시킬 수 있다.In addition, in the present invention, the radius of curvature of the inclined portion of the protruding curved surface is configured to be 50 to 150 μm. Through this, in the present invention, the relative luminance of the front surface can be increased to 92% or more and the relative luminance to the 60° side surface can be increased to 14% or more. As a result, the present invention can satisfy the high-quality reference values of the front relative luminance and the 60° side relative luminance.
도 1a,1b는 종래기술에 따른 광학 필름을 도시하는 단면도이다. 1A and 1B are cross-sectional views illustrating an optical film according to the prior art.
도 2는 본 발명에 따른 광학 필름을 도시하는 단면도이다.2 is a cross-sectional view showing an optical film according to the present invention.
도 3은 본 발명에 따른 광학 필름의 변형례를 도시하는 단면도이다.3 is a cross-sectional view showing a modified example of the optical film according to the present invention.
이하, 첨부도면을 참조하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명에 따른 광학 필름을 도시하는 단면도이다.2 is a cross-sectional view showing an optical film according to the present invention.
도 2에 도시한 바와 같이, 본 발명의 광학 필름(210)은 고굴절층(211), 저굴절층(212)을 포함하여 구성할 수 있다.As shown in FIG. 2 , the optical film 210 of the present invention may include a high refractive index layer 211 and a low refractive index layer 212 .
고굴절층(211)은 저굴절층(212)과 대향하는 면에 음각 패턴(RP)을 형성할 수 있다. 음각 패턴(RP)은 함몰 평탄부(F3)와 돌출 곡면 경사부(S3)를 포함할 수 있다.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 .
함몰 평탄부(F3)는 음각 패턴(RP)의 중앙 영역에서 소정 깊이(D)로 함몰되어 형성된다. 함몰 평탄부(F3)는 고굴절층(211)의 일면(도 2에서 저굴절층(212)과 결합하는 면)과 나란하게 수평으로 형성될 수 있다.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 ).
돌출 곡면 경사부(S3)는 함몰 평탄부(F3)의 양측 단부와 고굴절층(211)의 일면(도 2에서 저굴절층(212)과 결합하는 면) 사이를 경사지게 연결하면서 형성될 수 있다. 돌출 곡면 경사부(S3)는 고굴절층(211)에서 저굴절층(212)의 방향으로 곡면지게 돌출하는(또는 휘어지는) 형태, 즉 돌출 곡면 경사로 형성될 수 있다.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.
음각 패턴(RP)은 장폭(LW)과 단폭(SW)을 5~20㎛, 깊이(D)를 5~15㎛로 할 때 광 확산 효과가 큰 것으로 알려져 있다. 따라서, 본 발명에서는 장폭(LW)을 10~20㎛, 단폭(SW)을 5~15㎛, 깊이(D)를 5~15㎛로 먼저 설정할 수 있다. 음각 패턴(RP)은 다수를 이격시켜 형성할 수 있다.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 μm and the depth (D) is 5 to 15 μm. Accordingly, in the present invention, the long width (LW) can be set to 10 to 20 μm, the short width (SW) to 5 to 15 μm, and the depth (D) can be set first to 5 to 15 μm. The engraved pattern RP may be formed to be spaced apart from each other.
고굴절층(211)은 예를 들어 (메트)아크릴계, 폴리카보네이트계, 실리콘계, 에폭시계 수지 중 하나 이상을 포함하는 자외선 경화형 조성물로 구성할 수 있다. 고굴절층(211)은 1.57~1.70의 굴절률을 가질 수 있다.The high refractive index layer 211 may be formed of, for example, an ultraviolet curable composition including at least one of (meth)acrylic, polycarbonate, silicone, and epoxy resins. The high refractive index layer 211 may have a refractive index of 1.57 to 1.70.
저굴절층(212)은 고굴절층(211)의 음각 패턴(RP)을 충전(또는 매립)하면서 고굴절층(211)의 일면(도 2에서는 하면)에 결합할 수 있다.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 .
저굴절층(212)은 자외선 경화성인 투명 수지, 예를 들어 (메트)아크릴계, 폴리카보네이트계, 실리콘계, 에폭시계 수지 등으로 구성할 수 있다. 저굴절층(212)은 1.42~1.50의 굴절률을 가질 수 있다.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.
아래의 표 1은 음각 패턴(RP)의 형상 변화에 따라, 정면 상대 휘도, 60° 측면 상대 휘도가 변하는 것을 보여주고 있다. 여기서, 고굴절층(211)은 굴절률 1.58의 아크릴계 수지를 사용하였다. 저굴절층(212)은 굴절률 1.44의 에폭시계 수지를 사용하였다. 음각 패턴(RP)은 장폭(LW)을 10㎛, 단폭(SW)을 5㎛, 깊이(D)를 15㎛, 주기(T)를 29㎛로 하였다. 돌출 곡면 경사부(S3)의 곡률반경(R)을 변화시키면서, 정면 상대 휘도와 60° 측면 상대 휘도를 측정하였다. 또한, 본 발명에 따른 돌출 곡면 경사부(S3)와 종래기술에 따른 경사부(직선, 함몰 곡면 경사)의 기술적 효과를 비교하기 위하여, 종래기술에 따른 경사부(직선, 함몰 곡면 경사)에 대해서도, 정면 상대 휘도와 60° 측면 상대 휘도를 측정하였다.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). Here, 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 µm, a short width (SW) of 5 µm, a depth (D) of 15 µm, and a period (T) of 29 µm. 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. In addition, 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.
곡률반경
(㎛)radius of curvature
(μm) 		정면
상대 휘도(%)face
Relative luminance (%) 		60° 측면
상대 휘도(%)60° side
Relative luminance (%) 		비고note
실험례 1Experimental Example 1 -- 91.991.9 12.412.4 직선Straight
실험례 2Experimental Example 2 5050 92.092.0 13.113.1 함몰
곡면
경사depression
curved surface
slope
실험례 3Experimental Example 3 100100 93.193.1 13.513.5
실험례 4Experimental Example 4 150150 93.693.6 13.413.4
실험례 5Experiment 5 3030 89.589.5 16.316.3 돌출
곡면
경사stick out
curved surface
slope
실험례 6Experiment 6 5050 92.292.2 15.415.4
실험례 7Experiment 7 7070 93.193.1 15.115.1
실험례 8Experiment 8 9090 93.893.8 14.714.7
실험례 9Experiment 9 110110 94.194.1 14.414.4
실험례 10Experimental Example 10 130130 93.993.9 14.214.2
실험례 11Experimental Example 11 150150 92.492.4 14.114.1
실험례 12Experiment 12 170170 91.691.6 13.813.8
위의 표 1에서 보듯이, 경사부를 직선과 함몰 곡면 경사로 구성하는 경우, 일부 실험례에서 정면 상대 휘도가 92%를 초과하였으나, 60° 측면 상대 휘도에서는 모두가 14%를 넘지 못하였다. 한편, 경사부를 돌출 곡면 경사로 구성하는 경우에는, 곡률반경(R)이 50~150㎛에서 정면 상대 휘도가 92%를 넘고, 곡률반경(R)이 30~150㎛에서 60° 측면 상대 휘도가 14%를 넘는 것으로 측정되었다. 그런데, 실제 제품(표시 장치)에서는, 정면 상대 휘도와 60° 측면 상대 휘도가 각각 92% 이상과 14% 이상을 충족하는 것이 바람직하므로, 본 발명에서 돌출 곡면 경사부(S3)의 곡률반경(R)은 50~150㎛로 한정하는 것이 바람직하다. 이러한 곡률반경(R)의 한정은 기술적 의미를 가질 수 있다.As shown in Table 1 above, when the inclined portion is composed of a straight line and a recessed curved surface, 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. On the other hand, when the inclined portion is composed of a protruding curved slope, the frontal relative luminance exceeds 92% at a radius of curvature (R) of 50 to 150 μm, and when the radius of curvature (R) is 30 to 150 μm, a 60° side relative luminance is 14 % was measured. However, in an actual product (display device), since it is preferable that the front relative luminance and the 60° side relative luminance satisfy 92% or more and 14% or more, respectively, the radius of curvature R of the protruding curved inclined portion S3 in the present invention ) is preferably limited to 50 to 150 μm. This limitation of the radius of curvature R may have a technical meaning.
아래의 표 2는 음각 패턴(RP)의 형상을 위의 표 1과 다르게 한 후 돌출 곡면 경사부(S3)의 곡률반경(R)을 변화시키면서 정면 상대 휘도와 60° 측면 상대 휘도를 측정한 결과를 보여주고 있다. 여기서, 고굴절층(211)과 저굴절층(212)은 위의 표 1과 동일한 재질을 사용하였다. 음각 패턴(RP)은 장폭(LW)을 15㎛, 단폭(SW)을 10㎛, 깊이(D)를 15㎛, 주기(T)를 29㎛로 하였다. 여기서도, 본 발명에 따른 돌출 곡면 경사부(S3)와 종래기술에 따른 경사부(직선, 함몰 곡면 경사)의 기술적 효과를 비교하기 위하여, 종래기술의 경사부(직선, 함몰 곡면 경사)에 대해서도 정면 상대 휘도와 60° 측면 상대 휘도를 측정하였다.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 µm, a short width (SW) of 10 µm, a depth (D) of 15 µm, and a period (T) of 29 µm. Here too, 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 front surface of the conventional inclined portion (straight, depressed curved surface inclined) Relative luminance and 60° side relative luminance were measured.
곡률반경
(㎛)radius of curvature
(μm) 		정면
상대 휘도(%)face
Relative luminance (%) 		60° 측면
상대 휘도(%)60° side
Relative luminance (%) 		비고note
실험례 13Experimental Example 13 -- 92.592.5 12.512.5 직선Straight
실험례 14Experimental Example 14 5050 91.991.9 13.013.0 함몰
곡면
경사depression
curved surface
slope
실험례 15Experimental Example 15 100100 92.892.8 13.613.6
실험례 16Experimental Example 16 150150 94.194.1 13.513.5
실험례 17Experimental Example 17 3030 88.388.3 15.315.3 돌출
곡면
경사stick out
curved surface
slope
실험례 18Experimental Example 18 5050 92.092.0 15.115.1
실험례 19Experimental Example 19 7070 93.293.2 15.015.0
실험례 20Experimental Example 20 9090 93.993.9 14.814.8
실험례 21Experimental Example 21 110110 94.394.3 14.714.7
실험례 22Experimental Example 22 130130 94.094.0 14.614.6
실험례 23Experiment 23 150150 92.392.3 14.214.2
실험례 24Experimental Example 24 170170 91.991.9 13.913.9
위의 표 2에서 보듯이, 경사부를 직선과 함몰 곡면 경사로 구성하는 경우, 일부 실험례에서 정면 상대 휘도가 92%를 초과하였으나, 60° 측면 상대 휘도에서는 모두가 14%를 넘지 못하는 것으로 측정되었다. 한편, 경사부를 돌출 곡면 경사로 구성하는 경우에는, 위의 표 1의 결과와 동일하게, 곡률반경(R)이 50~150㎛에서 정면 상대 휘도가 92%를 넘어서고, 곡률반경(R)이 30~150㎛에서 60° 측면 상대 휘도가 14%를 넘어서는 것으로 측정되었다. 여기서도, 실제 제품에서는 정면 상대 휘도와 60° 측면 상대 휘도가 각각 92% 이상과 14% 이상을 충족하여야 하므로, 본 발명의 돌출 곡면 경사부(S3)에서 돌출 곡면의 곡률반경(R)은 50~150㎛로 한정하는 것이 바람직하다.As shown in Table 2 above, when the inclined portion is composed of a straight line and a recessed curved surface slope, 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. On the other hand, in the case of configuring the inclined portion as a protruding curved surface slope, as in the result of Table 1 above, the front relative luminance exceeds 92% at a radius of curvature (R) of 50 to 150 μm, and the radius of curvature (R) is 30 to At 150 μm, the 60° side relative luminance was measured to exceed 14%. Here too, in the actual product, since the front relative luminance and the 60° side relative luminance must satisfy 92% or more and 14% or more, respectively, 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.
아래의 표 3은 음각 패턴(RP)의 형상을 위의 표 1,2와 다르게 한 후 돌출 곡면 경사부(S3)의 곡률반경(R)을 변화시키면서 정면 상대 휘도와 60° 측면 상대 휘도를 측정한 결과이다. 여기서, 고굴절층(211)과 저굴절층(212)은 위의 표 1과 동일한 재질을 사용하였다. 음각 패턴(RP)은 장폭(LW)을 20㎛, 단폭(SW)을 15㎛, 깊이(D)를 15㎛, 주기(T)를 29㎛로 하였다. 여기서도, 본 발명에 따른 돌출 곡면 경사부(S3)와 종래기술의 경사부(직선, 함몰 곡면 경사)의 기술적 효과를 비교하기 위하여 종래기술의 경사부(직선, 함몰 곡면 경사)에 대해서도 정면 상대 휘도와 60° 측면 상대 휘도를 측정하였다.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. is a result 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 20 µm, a short width (SW) of 15 µm, a depth (D) of 15 µm, and a period (T) of 29 µm. Again, 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 inclination), the frontal relative luminance of the conventional inclined portion (straight, depressed curved surface inclination) and 60° side relative luminance were measured.
곡률반경
(㎛)radius of curvature
(μm) 		정면
상대 휘도(%)face
Relative luminance (%) 		60° 측면
상대 휘도(%)60° side
Relative luminance (%) 		비고note
실험례 25Experimental Example 25 -- 92.692.6 12.812.8 직선Straight
실험례 26Experimental Example 26 5050 92.292.2 13.213.2 함몰
곡면
경사depression
curved surface
slope
실험례 27Experimental Example 27 100100 93.193.1 13.813.8
실험례 28Experimental Example 28 150150 94.294.2 13.513.5
실험례 29Experimental Example 29 3030 91.291.2 15.515.5 돌출
곡면
경사stick out
curved surface
slope
실험례 30Experiment 30 5050 92.292.2 15.315.3
실험례 31Experimental Example 31 7070 92.892.8 15.215.2
실험례 32Experimental example 32 9090 93.693.6 14.914.9
실험례 33Experimental Example 33 110110 94.794.7 14.814.8
실험례 34Experimental Example 34 130130 94.494.4 14.514.5
실험례 35Experimental Example 35 150150 92.592.5 14.114.1
실험례 36Experimental Example 36 170170 91.891.8 13.813.8
위의 표 3에서 보듯이, 경사부를 직선과 함몰 곡면 경사로 구성하는 경우, 전체 실험례에서 정면 상대 휘도가 92%를 초과하였으나, 60° 측면 상대 휘도에서는 모두가 14%를 넘지 못하는 것으로 측정되었다. 한편, 경사부를 돌출 곡면 경사로 구성하는 경우에는, 위의 표 1,2의 결과와 동일하게, 곡률반경(R)이 50~150㎛에서 정면 상대 휘도가 92%를 넘고, 곡률반경(R)이 30~150㎛에서 60° 측면 상대 휘도가 14%를 넘어서는 것으로 측정되었다. 그런데, 실제 표시 장치에서 정면 상대 휘도와 60° 측면 상대 휘도는 각각 92% 이상과 14% 이상을 충족하여야 한다. 따라서, 본 발명의 돌출 곡면 경사부(S3)에서 돌출 곡면의 곡률반경(R)은 50~150㎛로 한정하는 것이 바람직하다.As shown in Table 3 above, when the inclined portion is composed of a straight line and a recessed curved surface, the front relative luminance exceeded 92% in all experimental examples, but it was measured that all of them did not exceed 14% in the 60° side relative luminance. On the other hand, when the inclined portion is composed of a protruding curved surface inclined, as in the results of Tables 1 and 2 above, the front relative luminance exceeds 92% when the radius of curvature R is 50 to 150 μm, and the radius of curvature R is It was measured that the 60° side relative luminance exceeds 14% at 30~150㎛. However, in an actual display device, the front relative luminance and the 60° side relative luminance must satisfy 92% or more and 14% or more, respectively. Therefore, it is preferable to limit the radius of curvature (R) of the protruding curved surface in the protruding curved inclined portion (S3) of the present invention to 50 ~ 150㎛.
위의 표 1~3의 결과를 종합하면, 본 발명의 광학 필름에서, 음각 패턴(RP)은 경사부를 돌출 곡면 경사로 구성하는 것이 바람직하다. 또한, 장폭(LW)을 10~20㎛, 단폭(SW)을 5~15㎛로 할 때, 돌출 곡면의 곡률반경(R)은 50~150㎛로 구성하는 것이 바람직하다.Combining the results of Tables 1 to 3 above, in the optical film of the present invention, the intaglio pattern (RP) is preferably composed of an inclined portion with a protruding curved surface inclined. In addition, when the long width (LW) is 10 to 20 μm, and the short width (SW) is 5 to 15 μm, the radius of curvature R of the protruding curved surface is preferably configured to be 50 to 150 μm.
한편, 고굴절층(211)과 저굴절층(212)의 재질(굴절률)을 바꾸면서 정면 상대 휘도와 60° 측면 상대 휘도의 변동 여부를 측정하였다. 여기서, 고굴절층(211)과 저굴절층(212)의 재질(굴절률) 변화는 위의 표 1~3의 결과, 즉 정면 상대 휘도와 60° 측면 상대 휘도의 측정값에 영향을 미치지 않는 것으로 확인되었다. 따라서, 본 발명의 광학 필름은 고굴절층(211)을 1.57~1.70의 굴절률을 갖는 재질로 사용할 수 있다. 본 발명의 광학 필름은 저굴절층(212)을 1.42~1.50의 굴절률을 갖는 재질로 사용할 수 있다. 이 경우, 고굴절층(211)과 저굴절층(212)의 굴절률 차이는 0.07~0.28일 수 있다.On the other hand, while changing the material (refractive index) of the high refractive index layer 211 and the low refractive index layer 212, it was measured whether the relative luminance of the front surface and the 60° side relative luminance fluctuated. Here, it is confirmed that the material (refractive index) change of the high refractive layer 211 and the low refractive layer 212 does not affect the results of Tables 1 to 3 above, that is, the measured values of the front relative luminance and the 60° side relative luminance. became Therefore, in the optical film of the present invention, 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. In this case, 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.
도 3은 본 발명에 따른 광학 필름의 변형례를 도시하는 단면도이다.3 is a cross-sectional view showing a modified example of the optical film according to the present invention.
도 3에 도시한 바와 같이, 변형 광학 필름(220)은 고굴절층(211)의 음각 패턴(RP)의 내부에만 저굴절층(212)을 충전하고 고굴절층(211)의 일면(도 3에서 하면)에는 저굴절층(212)을 결합하지 않는 형태로 구성할 수 있다. 이렇게 함으로써, 변형 광학 필름(220)은 두께를 최소화할 수 있다. 그 결과, 표시 장치의 박막화에 기여할 수 있다.As shown in FIG. 3 , 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.
도 3의 변형 광학 필름(220)에서 나머지 구성은 도 2의 대응 구성과 동일하다. 따라서, 변형 광학 필름(220)의 나머지 구성에 대한 상세 설명은 도 2의 관련 설명으로 갈음한다.The rest of the configuration in the deformable optical film 220 of FIG. 3 is the same as the corresponding configuration of FIG. 2 . Accordingly, a detailed description of the remaining configuration of the deformable optical film 220 is replaced with the related description of FIG. 2 .
위에서 설명한 광학 필름은 편광판의 일부로 사용할 수 있다. 이 경우, 편광판은 예를 들어 위에서 설명한 광학 필름을 편광자 필름과 보호 필름 사이에 삽입 적층한 구조로 구성할 수 있다.The optical film described above can be used as part of a polarizing plate. In this case, 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.
또한, 위에서 설명한 광학 필름은 액정 패널 외에 다양한 표시 장치, 예를 들어 플라즈마 패널, 전계발광 패널, 유기발광다이오드 패널 등에도 사용할 수 있다.In addition, the 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.
이상, 본 발명을 여러 실시예로서 설명하였는데, 이들은 본 발명을 예증하기 위한 것이다. 통상의 기술자라면 이러한 실시예를 다른 형태로 변형하거나 수정할 수 있을 것이다. 그러나, 본 발명의 권리범위는 아래의 특허청구범위에 의해 정해지므로, 그러한 변형이나 수정이 본 발명의 권리범위에 포함되는 것으로 해석될 수 있다.In the above, the present invention has been described as several embodiments, which are intended to illustrate the present invention. Those skilled in the art will be able to change or modify these embodiments in other forms. However, since the scope of the present invention is defined by the claims below, such variations or modifications may be construed as being included in the scope of the present invention.
[부호의 설명][Explanation of code]
110,120,210,220 : 광학 필름110,120,210,220: optical film
111,121,211,221 : 고굴절층111,121,211,221: high refractive layer
112,122,212,222 : 저굴절층112,122,212,222: low refractive layer
F1,F2,F3 : 함몰 평탄부 S1 : 직선 경사부F1, F2, F3: flat recessed part S1: straight inclined part
S2 : 함몰 곡면 경사부 S3 : 돌출 곡면 경사부S2: recessed curved surface slope S3: protruding curved surface slope
RP : 음각 패턴 LW : 음각 패턴의 장폭RP : engraved pattern LW : long width of engraved pattern
SW : 음각 패턴의 단폭 D : 음각 패턴의 깊이SW : Short width of engraved pattern D : Depth of engraved pattern
T : 음각 패턴의 주기 R : 돌출 곡면 경사부의 곡률반경T : Period of engraved pattern R : Curvature radius of inclined part of protruding curved surface

Claims (8)

  1. 일면에 음각 패턴을 이격시켜 다수를 구비하는 고굴절층; 및A high refractive index layer having a plurality of spaced apart intaglio patterns on one surface; and
    상기 음각 패턴을 충전하면서 상기 고굴절층의 일면에서 결합하는 저굴절층을 포함하고,Comprising a low-refractive layer coupled on one surface of the high-refractive layer while filling the intaglio pattern,
    상기 음각 패턴은The engraved pattern is
    중앙 영역에 함몰되어 수평으로 형성되는 함몰 평탄부; 및a depression flat portion that is depressed in the central region and is formed horizontally; and
    상기 함몰 평탄부와 상기 고굴절층의 일면 사이에 상기 고굴절층에서 상기 저굴절층으로 돌출하면서 곡면 형태로 경사지는 돌출 곡면 경사부를 포함하는, 명암비 개선 광학 필름.Contrast improvement optical film comprising a protruding curved slope inclined in a curved shape while protruding from the high refractive layer to the low refractive layer between the depressed flat part and one surface of the high refractive layer.
  2. 제1항에 있어서, 상기 돌출 곡면 경사부는According to claim 1, wherein the protruding curved inclined portion
    50~150㎛의 곡률반경을 갖는, 명암비 개선 광학 필름.Contrast improvement optical film having a radius of curvature of 50 ~ 150㎛.
  3. 제2항에 있어서, 상기 음각 패턴은According to claim 2, wherein the engraved pattern
    장폭을 10~20㎛, 단폭을 5~15㎛로 구성하는, 명암비 개선 광학 필름.Contrast improvement optical film comprising a long width of 10 to 20 μm and a short width of 5 to 15 μm.
  4. 제2항에 있어서,3. The method of claim 2,
    정면 상대 휘도는 광학 필름을 적층하기 전 정면 휘도의 92% 이상이고,The front relative luminance is 92% or more of the front luminance before laminating the optical film,
    60° 측면 상대 휘도는 상기 정면 상대 휘도의 14% 이상인, 명암비 개선 광학 필름.wherein the 60° side relative brightness is at least 14% of the front relative brightness.
  5. 제2항에 있어서, 3. The method of claim 2,
    상기 고굴절층은 1.57~1.70의 굴절률을 갖고,The high refractive layer has a refractive index of 1.57 to 1.70,
    상기 저굴절층은 1.42~1.50의 굴절률을 갖는, 명암비 개선 광학 필름.The low-refractive layer has a refractive index of 1.42 to 1.50, a contrast ratio improvement optical film.
  6. 제5항에 있어서, 상기 고굴절층과 상기 저굴절층의 굴절률 차이는The method of claim 5, wherein the refractive index difference between the high refractive index layer and the low refractive index layer is
    0.07~0.28인, 명암비 개선 광학 필름.0.07 to 0.28, contrast-improved optical film.
  7. 제1항 내지 제6항 중 어느 한 항의 명암비 개선 광학 필름을 포함하는, 편광판.A polarizing plate comprising the optical film of any one of claims 1 to 6 to improve the contrast ratio.
  8. 제7항에 따른 편광판을 포함하는, 표시 장치.A display device comprising the polarizing plate according to claim 7 .
PCT/KR2021/015296 2020-11-04 2021-10-28 Optical film for improving contrast ratio WO2022097993A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180074622.7A CN116457707A (en) 2020-11-04 2021-10-28 Contrast-improving optical film
JP2023524674A JP2023548053A (en) 2020-11-04 2021-10-28 Optical film that improves contrast ratio

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2020-0145763 2020-11-04
KR1020200145763A KR20220060154A (en) 2020-11-04 2020-11-04 Optical Film With Improved Contrast Ratio

Publications (1)

Publication Number Publication Date
WO2022097993A1 true WO2022097993A1 (en) 2022-05-12

Family

ID=81458008

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2021/015296 WO2022097993A1 (en) 2020-11-04 2021-10-28 Optical film for improving contrast ratio

Country Status (4)

Country Link
JP (1) JP2023548053A (en)
KR (1) KR20220060154A (en)
CN (1) CN116457707A (en)
WO (1) WO2022097993A1 (en)

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 (en) * 2016-02-01 2017-08-09 삼성에스디아이 주식회사 Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same
KR20190113464A (en) * 2018-03-28 2019-10-08 삼성에스디아이 주식회사 Optical film for improving visibility, polarizing plate comprising the same and flexible optical display apparatus comprising the same
KR20190133196A (en) * 2017-04-19 2019-12-02 다이니폰 인사츠 가부시키가이샤 Optical structures and displays
KR20200113625A (en) * 2019-03-26 2020-10-07 동우 화인켐 주식회사 Optical Film Improving Contrast Ratio and Display Having the Same

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 (en) * 2016-02-01 2017-08-09 삼성에스디아이 주식회사 Composite polarizing plate, module for liquid crystal display apparatus comprising the same and liquid crystal display apparatus comprising the same
KR20190133196A (en) * 2017-04-19 2019-12-02 다이니폰 인사츠 가부시키가이샤 Optical structures and displays
KR20190113464A (en) * 2018-03-28 2019-10-08 삼성에스디아이 주식회사 Optical film for improving visibility, polarizing plate comprising the same and flexible optical display apparatus comprising the same
KR20200113625A (en) * 2019-03-26 2020-10-07 동우 화인켐 주식회사 Optical Film Improving Contrast Ratio and Display Having the Same

Also Published As

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

Similar Documents

Publication Publication Date Title
US9097829B2 (en) Backlight unit with patterned light guide panel
WO2016175580A1 (en) Optical film for improving contrast ratio, polarizing plate including same, and liquid crystal display device including same
EP0658254B1 (en) Display device
WO2015084018A1 (en) Optical member and display apparatus having same
WO2018212528A1 (en) Polarizing plate and optical display device including same
EP2625792A2 (en) Slim type touch panel and mobile terminal including the same
WO2015105317A1 (en) Optical sheet assembly and back-light unit comprising same
WO2018155792A1 (en) Contrast ratio improving optical film, polarizing plate comprising same, and liquid crystal display device comprising same
WO2018080036A1 (en) Polarizing plate and liquid crystal display device comprising same
WO2013035909A1 (en) Back light unit within resin layer for light-guide and lcd using the same
WO2009108003A1 (en) Optical sheet and liquid crystal display equipped with the same
WO2022097993A1 (en) Optical film for improving contrast ratio
WO2011062461A2 (en) Integrated optical sheet and optical device including same
WO2016117931A1 (en) Optical sheet for backlight unit and method for manufacturing same
WO2022149799A1 (en) Brightness enhancement film
KR102514151B1 (en) Polarizing plate and optical display apparatus comprising the same
KR100988764B1 (en) Multi-functional optic film
WO2013051872A2 (en) Surface light source device
KR20120077663A (en) Scratch resistant light guide panel, method for preparing thereof and lcd back light unit using the same
WO2014185734A1 (en) Composite optical sheet and optical display device including same
WO2018008938A1 (en) Optical sheet, back light unit, and display device including same
WO2023224316A1 (en) Display area with transition layer
WO2010058999A2 (en) Optical sheet and backlight unit furnished with same
WO2023003207A1 (en) Light guide plate using grouping pattern and display device comprising same
WO2013100482A1 (en) Light guide plate and backlight unit including same

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: 21889458

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023524674

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 202180074622.7

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21889458

Country of ref document: EP

Kind code of ref document: A1