WO2006046832A1 - Corps optique polarisant et procede de fabrication associe - Google Patents

Corps optique polarisant et procede de fabrication associe Download PDF

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Publication number
WO2006046832A1
WO2006046832A1 PCT/KR2005/003580 KR2005003580W WO2006046832A1 WO 2006046832 A1 WO2006046832 A1 WO 2006046832A1 KR 2005003580 W KR2005003580 W KR 2005003580W WO 2006046832 A1 WO2006046832 A1 WO 2006046832A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
axis direction
cross
light
optical body
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2005/003580
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English (en)
Inventor
Yoojin Choi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HA KYOUNGSU
Original Assignee
HA KYOUNGSU
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 HA KYOUNGSU filed Critical HA KYOUNGSU
Priority to KR1020067003247A priority Critical patent/KR100756067B1/ko
Publication of WO2006046832A1 publication Critical patent/WO2006046832A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • 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
    • G02B5/3016—Polarising elements involving passive liquid crystal elements

Definitions

  • the present invention relates to a polarizing optical body and a method for making thereof, particularly using diffuse transmission effect of light.
  • a polarizer disposed between a display means which produces images by using polarization and a lighting means is suggested.
  • the polarizer which comprises a first polymeric disperse phase dispersed within a second polymeric continuous phase, and has the difference in refractive indices between the disperse phase and the continuous phase along a first axis, which is sufficiently small for transmitting light in a first polarization state to the display means direction, and the difference in refractive indices between the disperse phase and the continuous phase perpendicular to the first axis and along a second axis, which is sufficiently large for diffuse reflecting light in a second polarization state to the lighting means direction, and wherein the lighting means changes polarization state of a portion of light reflected by the polarizer, thus the light is reoriented to the direction opposite to the polarizer direction, is proposed.
  • the above-identified known patents relate to the structure of diffuse reflective polarizers and methods thereof.
  • the term "diffuse reflection” means the reflection of incident light rays outside the specular cone with a vertex angle of about 16 degrees centered around the specular angle.
  • the difference of refractive indices between the continuous phase and the disperse phase in the first axis direction are adapted to a large value of at least 0.05.
  • the polymeric disperse phase are dispersed and disposed within the polymeric continuous phase, and stretched in the machine direction, so that one of the continuous phase and the disperse phase can have birefringence.
  • the object of the present invention is to provide polarizing optical bodies which reduce a loss of light by diffuse reflection, which is the problem in the known art, have an improved fill factor and a high reliability on temperature, and are easily produced, and a method for making thereof.
  • a polarizing optical body for polarizing and emitting incident light
  • the polarizing optical body includes a polymeric network layer consisting of at least a first and a second media
  • the first medium is cross-linkable polymeric liquid crystal of which liquid crystal molecules are aligned in a predetermined first axis direction
  • the second medium is a light- or thermo- setting resin (hereinafter, referred to "setting resin")
  • the polarizing optical body is particle-like or net-like polymer.
  • the shape of the particle includes, but is not limited to, a spherical form, an amorphous form, or the like.
  • the polymeric network layer consisting of the two media has substantially isotropy or homogeneity in its mixed form and distribution. Hence, scatter distribution of light in the polymeric network layer is uniform in substantially all directions, and thus, a phenomenon which it looks dark caused by decrease of transmittance of light in a particular direction can be avoided.
  • refractive indices of the cross-linkable polymeric liquid crystal and the setting resin are different in a first axis direction which is a predetermined direction on a horizontal plane parallel to the polymeric network layer and substantially the same in a second axis direction perpendicular to the first axis on the horizontal plane.
  • the polarized light of the direction parallel to the second axis direction moves on in the media without any change, and polarized light of a different direction is refracted in an interface between the cross-linkable polymeric liquid crystal and the setting resin, and simultaneously the direction of polarization is changed. If such procedures are repeated, the direction of polarization of the polarized light of the different direction gradually becomes parallel to the second axis direction.
  • the diffuse reflection of the polarizing optical body according to the present invention is less than 20% and polarization of which main mechanism is the diffuse transmission is obtained .
  • the polarizing optical body of the present invention because birefringence is not attained in a stretching way, but the overall bire ⁇ fringence is formed by alignment of the cross-linkable polymeric liquid crystal in a particular direction by orientation means and a crosslinking reaction caused by light or heat for fixing the the alignment direction.
  • the orientation means are an orientation film, the electric field, the magnetic fields, an oriented polymeric fiber net, or the like.
  • the polarizing optical body may further include a protective layer which protects the polymeric network layer from a mechanical impact or abrasion on the outside of the polymeric network layer.
  • the present invention is advantageous in that it overcomes the problems of the prior arts which are a loss of light and difficulty in manufacturing processes.
  • a polarizing optical body which uses diffuse transmission instead of diffuse reflection which has a high loss of light as its main mechanism, to improve efficiency of light transmission and make scatter distribution substantially symmetrical, and which prevents a phenomenon in which it looks dark in a particular direction and can be easily manufactured.
  • [20] 100 a polarizing optical body
  • [25] 200 a polarizing optical body
  • FIG. 1 is a schematic drawing illustrating the structure of a polarizing optical body
  • the polarizing optical body 100 of the present invention comprises the polymeric network layer 30 consisting of at least cross-linkable polymeric liquid crystal 10 and the setting resin 20 separately mixed with the polymeric liquid crystal.
  • the polymeric network layer 30 is formed by hardening reaction caused by heat or light, the hardening reaction happening in a state where the setting resin 20 represented by epoxy resin and the cross-linkable polymeric liquid crystal 10 are dissolved in a common solvent such as xylene to be mixed.
  • cross-linkable polymeric liquid crystal 10 leads to cross- linking reaction by light or heat. It is also preferred that the size of the particle formed of the cross-linkable polymeric liquid crystal 10 is substantially 2 to 100 D in diameter.
  • the cross-linkable polymeric liquid crystal 10 and the setting resin 20 are different in their refractive indices in a predetermined first axis direction on a horizontal plane parallel to the surface of the polymeric network layer 30 so that they substantially affect polarization direction of light, and have no difference in their refractive indices in a second axis direction perpendicular to the first axis direction on the horizontal plane so that they do not substantially affect polarization direction of light.
  • the setting resin 20 is hardened and then the cross-linkable polymeric liquid crystal 10 is aligned in a pre ⁇ determined direction by using orientation means such as the electric field, the magnetic field, and the like, followed by the aligned liquid crystal 10 being hardened, for example, by ultraviolet rays.
  • orientation means such as the electric field, the magnetic field, and the like
  • the aligned liquid crystal 10 being hardened, for example, by ultraviolet rays.
  • the alignment direction of the cross-linkable polymeric liquid crystal 10 allows the minor axis direction of the liquid crystal molecules to be parallel to the second axis direction and the major axis direction to be parallel to the first axis direction.
  • the polymeric network layer 30 has homogeneity or isotropy in its shape and distribution of two media generally.
  • the setting resin 20 and the cross-linkable polymeric liquid crystal 10 should be sufficiently blended to be homogeneously mixed, and, after being hardened to form the polymeric network layer 30, no stress or tension should not be applied in a particular direction. Therefore, in case the polarizing optical body 100 of the present invention is man ⁇ ufactured in the form of film, the moving or winding speed of the film should be maintained uniformly.
  • the cross-linkable polymeric liquid crystal 10 is aligned by the electric field or the magnetic field so that tension may not be applied in a particular direction. It is also preferred that the birefringence of the polymeric network layer 30 is less than 0.01 or zero.
  • the polymeric network layer 30 further comprises a protective layer 40 on its outside, which protects from a mechanical impact or abrasion.
  • a polarizing optical body 200 of the present invention includes a polymeric network layer 230 consisting of a cross-linkable polymeric liquid crystal layer 210 and light-refractive particles 220 which are mixed with and distributed in the polymeric liquid crystal layer 210.
  • the light-refractive particles 220 may be selected from polymer particles such as polyethylene particles, polyurethane particles, and the like, or inorganic particles such as silica particles.
  • the cross-linkable polymeric liquid crystal [42] According to the present embodiment, the cross-linkable polymeric liquid crystal
  • the light-refractive particles 220 is mixed with the light-refractive particles 220 is a state of being dissolved in a solvent such as chloroform.
  • a solvent such as chloroform.
  • the shape of the light-refractive particles 220 may be a sphere, a pole, a plate, or the like, these particles 220 should be formed so that they can be distributed throughout the cross-linkable polymeric liquid crystal layer 210 with isotropy or homogeneity substantially.
  • scatter distribution of light within the polarizing optical body 200 can be uniform in all directions, thereby preventing a phenomenon in which it looks dark in a particular direction.
  • the solution of the cross-linkable polymeric liquid crystal is mixed with the light-refractive particles 220 and sufficiently stirred to be blended well, which allows no stress or tension in a particular direction to be applied.
  • the blend of the light-refractive particles 220 with the cross-linkable polymeric liquid crystal layer 210 is applied on a substrate such as a transparent film, and the solvent is volatilized.
  • the liquid crystal molecules are aligned by applying the electric field, the magnetic fields, or the like, and the liquid crystal layer 210 is hardened, for example, by irradiation of the aligned liquid crystal layer 210 with ultraviolet rays.
  • the alignment direction of the liquid crystal molecules is the same as described above with reference to Fig. 1.
  • the polarizing optical body 200 of the present invention since an amount of diffuse transmission of light passing through the body is larger than that of diffuse reflection, a loss of light caused by reflection can be minimized to improve light transmittance.
  • the difference in the refractive indices of the cross-linkable polymeric liquid crystal layer 210 and light-refractive particles 220 is to be substantially 0.04 and the size of the light-refractive particles 220 is to be substantially 1 D in diameter.
  • a polarizing optical body which uses diffuse transmission instead of diffuse reflection which has a high loss of light as its main mechanism, to improve efficiency of light transmission and make scatter distribution substantially symmetrical, and which prevents a phenomenon in which it looks dark in a particular direction and can be easily manufactured.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un corps optique polarisant à perte de lumière réduite en raison d'une réflexion diffuse, d'une bonne efficacité de transmission de lumière, et d'une fiabilité élevée en matière de température, pouvant être fabriqué facilement ; ainsi que son procédé de fabrication. A cet effet, l'invention propose un corps optique polarisant permettant de polariser et d'émettre une lumière incidente, ledit corps optique polarisant comprenant une couche de réseau polymère constituée d'au moins un premier et un deuxième milieu. Le premier milieu est un cristal liquide polymère réticulable dont les molécules de cristal liquide sont alignées dans un premier sens axial prédéterminé, le deuxième milieu étant une résine durcissant à la lumière ou sous l'effet de la chaleur et un polymère de type particulaire ou en réseau.
PCT/KR2005/003580 2004-10-26 2005-10-26 Corps optique polarisant et procede de fabrication associe Ceased WO2006046832A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020067003247A KR100756067B1 (ko) 2004-10-26 2005-10-26 편광 광학체 및 그 제조 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0085552 2004-10-26
KR20040085552 2004-10-26

Publications (1)

Publication Number Publication Date
WO2006046832A1 true WO2006046832A1 (fr) 2006-05-04

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PCT/KR2005/003580 Ceased WO2006046832A1 (fr) 2004-10-26 2005-10-26 Corps optique polarisant et procede de fabrication associe

Country Status (2)

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KR (1) KR100756067B1 (fr)
WO (1) WO2006046832A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109196330A (zh) * 2016-05-02 2019-01-11 汉米尔顿联合股份有限公司 用于对生物和非生物粒子进行检测和分类的实时光学方法和系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101041215B1 (ko) * 2009-06-17 2011-06-13 (주)엔디스 수직 배향을 가진 액정 표시 소자 및 이를 제조하는 방법
JP6880672B2 (ja) * 2016-11-24 2021-06-02 大日本印刷株式会社 偏光分離フィルム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063400A1 (fr) * 1998-06-05 1999-12-09 Reveo, Inc. Polariseurs reflechissants a spectre reglable et a modes de fonctionnement electriquement commutables
JP2001215333A (ja) * 2000-02-07 2001-08-10 Sumitomo Chem Co Ltd 半透過半反射性偏光素子
WO2003081322A2 (fr) * 2002-03-26 2003-10-02 Fuji Photo Film Co., Ltd. Plaque de polarisation, et afficheur a cristaux liquides
JP2004212863A (ja) * 2003-01-08 2004-07-29 Fuji Photo Film Co Ltd 液晶表示装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825543A (en) * 1996-02-29 1998-10-20 Minnesota Mining And Manufacturing Company Diffusely reflecting polarizing element including a first birefringent phase and a second phase

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063400A1 (fr) * 1998-06-05 1999-12-09 Reveo, Inc. Polariseurs reflechissants a spectre reglable et a modes de fonctionnement electriquement commutables
JP2001215333A (ja) * 2000-02-07 2001-08-10 Sumitomo Chem Co Ltd 半透過半反射性偏光素子
WO2003081322A2 (fr) * 2002-03-26 2003-10-02 Fuji Photo Film Co., Ltd. Plaque de polarisation, et afficheur a cristaux liquides
JP2004212863A (ja) * 2003-01-08 2004-07-29 Fuji Photo Film Co Ltd 液晶表示装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109196330A (zh) * 2016-05-02 2019-01-11 汉米尔顿联合股份有限公司 用于对生物和非生物粒子进行检测和分类的实时光学方法和系统
CN109196330B (zh) * 2016-05-02 2021-08-17 汉米尔顿联合股份有限公司 用于对生物和非生物粒子进行检测和分类的实时光学方法和系统

Also Published As

Publication number Publication date
KR20060093696A (ko) 2006-08-25
KR100756067B1 (ko) 2007-09-07

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