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WO2012030199A2 - Particules électrophorétiques, et dispositif d'affichage et feuille d'image qui comprennent celles-ci - Google Patents

Particules électrophorétiques, et dispositif d'affichage et feuille d'image qui comprennent celles-ci Download PDF

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Publication number
WO2012030199A2
WO2012030199A2 PCT/KR2011/006561 KR2011006561W WO2012030199A2 WO 2012030199 A2 WO2012030199 A2 WO 2012030199A2 KR 2011006561 W KR2011006561 W KR 2011006561W WO 2012030199 A2 WO2012030199 A2 WO 2012030199A2
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WO
WIPO (PCT)
Prior art keywords
particles
particle size
display device
size distribution
circularity
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/KR2011/006561
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English (en)
Korean (ko)
Other versions
WO2012030199A3 (fr
Inventor
김재환
조영태
정민영
이창빈
이용의
김철환
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.)
Image and Materials Inc
Original Assignee
Image and Materials Inc
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 Image and Materials Inc filed Critical Image and Materials Inc
Publication of WO2012030199A2 publication Critical patent/WO2012030199A2/fr
Publication of WO2012030199A3 publication Critical patent/WO2012030199A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type

Definitions

  • the present invention relates to display technology, and more particularly, to electrophoretic particles, a display device and an image sheet comprising the same.
  • an electrophoretic display device uses a phenomenon in which charged particles move by an electric field applied between two electrodes.
  • the particles may have one kind of color or two or more kinds of colors.
  • the polarities of these particles are generally opposite to each other, but can be independently controlled by the difference in electrophoretic mobility even if they have the same polarity.
  • image information is implemented by particles, so design parameters such as image quality and driving voltage, such as contrast ratio and color reproducibility, depend on the characteristics of the particles.
  • the technical problem to be achieved by the present invention is to provide electrophoretic particles that can not only improve image quality such as contrast ratio and color reproducibility, but can also reduce driving voltage.
  • Another technical object of the present invention is to provide a display device using the particles having the above-described advantages.
  • Another technical problem to be achieved by the present invention is to provide an image sheet using particles having the aforementioned advantages.
  • the particles for the electrophoretic display device the circularity of the particles is defined by Figure 1a below, the circularity is 0.930 or more and less than 1 size
  • Has 1A is the projection area of the two-dimensionally projected particles
  • P is the circumferential length of the two-dimensionally projected particles.
  • the particles according to another embodiment of the present invention the particles for the electrophoretic display device, the particle size distribution of the particles is determined by the following equation 2, the particle size distribution may have a size of 10% to 40%. have.
  • Particle size distribution ( ⁇ / ⁇ ) ⁇ 100 (where ⁇ is the arithmetic mean diameter of particle size and ⁇ is the standard deviation of the particle size)
  • the particles according to another embodiment of the present invention may have all the features of the circularity and the particle size distribution described above.
  • the size of the particles may have a size of 0.02 ⁇ m to 50 ⁇ m.
  • the particles may have a color.
  • the particles may comprise any one or a mixture of pigments, dyes, metal particles, metal oxide particles, and resins.
  • Electrophoretic display device for achieving the above another technical problem, the substrate facing each other; At least one cavity disposed between the substrates; And particles dispersed in the cavities and having at least one of the foregoing features.
  • the particles in the cavities may include two or more kinds of particles in which at least one of color and electrophoretic mobility is different. In this case, only particles corresponding to any one of the two or more kinds of particles may satisfy at least one of the circularity and the particle size distribution.
  • an image sheet including support substrates facing each other; At least one cavity disposed between the support substrates; And dispersed in the cavities and having at least one of the foregoing features.
  • the particles in the cavities may include two or more kinds of particles in which at least one of color and electrophoretic mobility is different, and in this case, any one of the two or more kinds of particles Only the corresponding particles may satisfy at least one of the circularity and the particle size distribution.
  • Electrophoretic particles according to the embodiments of the present invention may improve the shielding power to the external light transmitted by the light reflective sub-particles while ensuring excellent light reflectivity, thereby improving the color reproducibility of the electrophoretic display device.
  • by having an optimized circularity to have excellent filling and light shielding power it is possible to improve the contrast and color reproducibility of the electrophoretic display device.
  • FIG. 2A and 2B respectively show aggregates of particles having different particle size distributions
  • FIG. 2C is an electron scanning microscope image of particles manufactured to have a particle size distribution according to an embodiment of the present invention.
  • FIG. 3A is a cross-sectional view of an electrophoretic display apparatus using particles according to an embodiment of the present invention
  • FIG. 3B is a cross-sectional view of an electrophoretic display apparatus using particles having the same spherical shape and the same size as a comparative example.
  • first, second, etc. are used herein to describe various members, parts, regions, and / or parts, these members, parts, regions, and / or parts should not be limited by these terms. Is self-explanatory. These terms are only used to distinguish one member, part, region or part from another region or part. Thus, the first member, part, region, or portion, which will be described below, may refer to the second member, component, region, or portion without departing from the teachings of the present invention.
  • the inventors have observed that the particle shape and particle size distribution of the electrophoretic particles affect the response speed, display ratio and color reproduction of the electrophoretic display device.
  • the following examples improve the performance of the electrophoretic display device such as response speed, contrast ratio and color reproduction of the electrophoretic display device by controlling the particle shape and particle size distribution of the particles, and using the same for various image sheets and electrophoretic display devices. It is about.
  • FIG. 1A is a characteristic equation relating to the circularity of particles
  • FIG. 1B shows various forms of electrophoretic particles.
  • Particles used in the electrophoretic display device may have a variety of shapes, such as spherical (10A), elliptical (10B) and amorphous potato (10C) shown in Figure 1b, the particles having a variety of these forms Used as
  • the extent to which the shape of these particles is spherical can be assessed by the circularity shown in FIG. 1A.
  • the circularity is determined by the ratio of the projected area of the particle to the circumferential depth of the particle.
  • A is the projection area of the two-dimensionally projected particles
  • P is the circumferential length of the two-dimensionally projected particles.
  • the circularity of the particles can be measured using commercial software such as ImageJ (R) from an image obtained from a scanning electron microscope. Alternatively, the circularity can also be measured by a flow particle image analyzer with a FPIA-3000 (R) manufactured by SYSMEX (Kobe, Japan).
  • the contact between the particles and the contact between the particles and the control electrode surface are almost point contact.
  • the shielding force of the incident light by the particles may be lowered, thereby lowering the quality of the display image.
  • the point contact may cause a decrease in Van der Walls force between the electrode and the particles, thereby reducing the bistable stability of the particles when the power is removed.
  • the particles preferably have a circularity of 0.93 to less than 1, which is not a perfect sphere.
  • the light shielding power of the particles is increased, so that display quality such as contrast ratio and color reproducibility can be improved, and a suitable driving voltage can be ensured.
  • FIG. 2A and 2B show aggregates 11 and 12 of particles having different particle size distributions, respectively, and FIG. 2C is an electron scanning microscope image of an aggregate of particles having a particle size distribution according to an embodiment of the present invention.
  • the particle size distribution of the particles is defined by equation (2).
  • ⁇ is the arithmetic mean diameter of particle size and ⁇ is the standard deviation of the particle size.
  • the particle size distribution of the particles, from the images obtained from the scanning electron microscope as shown in the circular diagram, can be measured using commercial software such as ImageJ (R) .
  • the small value of the particle size distribution indicates that the particle size is almost similar, and the large value of the particle size distribution indicates that the particle size varies widely.
  • the size of the particles when the size of the particles is uniform, the charging and cohesiveness of the particles may be improved. However, as the particle size becomes uniform, in the reflective mode display, the light shielding power of the particle layer by the particles is weakened, thereby reducing the business card ratio and color reproducibility. In addition, when the size of the particles used is several micro to sub micro size, the weakening of the light shielding force causes a drastic deterioration of the image quality.
  • the particle size distribution of the particles may preferably be 10% to 40%.
  • the light shielding power of the particle layer (refering to the aggregate of particles distributed over the control electrode) is significantly increased, thereby improving the contrast ratio and color reproducibility.
  • the particle size distribution of less than 10% not only the filling of the particle layer is low, sufficient light shielding cannot be obtained, but also a separate classification process is required to obtain a small particle size distribution, which increases the particle manufacturing cost. If the particle size distribution exceeds 40%, there is a problem that the interchargeability between particles is deteriorated, and the life of the display device is shortened due to the aggregation of particles having different polarities.
  • 2C has a particle size distribution of about 0.2 ⁇ m to about 0.8 ⁇ m and a particle size distribution of about 20%. These particles not only had excellent color reproducibility, but also exhibited excellent contrast ratio of about 10 degrees. However, this is exemplary and the particles may have a size of 0.02 ⁇ m to 50 ⁇ m or less. If desired, in the case of a wet drive, the size of the particles may be within a relatively small range of 0.02 ⁇ m to 10 ⁇ m, and in the case of a dry drive, the size of the particles may be in the range of 0.02 ⁇ m to 50 ⁇ m. .
  • FIG. 3A is a cross-sectional view of an electrophoretic display apparatus 1000 using particles according to an embodiment of the present invention
  • FIG. 3B is a cross-sectional view of an electrophoretic display apparatus 1000R using particles having the same spherical shape and the same size as a comparative example. .
  • At least particles are to be dispersed between a first substrate 21 (which may be a lower substrate in this figure) and a second substrate 22 (which may be an upper substrate in this figure) facing each other.
  • a light conversion layer 70 may be provided that includes one or more cavities V1, V2, V3.
  • At least one of the lower substrate 20 and the upper substrate 21, for example, the upper substrate 21 on the observer 1 side may be formed of a transparent material such as glass and transparent resin.
  • the cavities V1, V2, V3 may be defined by the partition 30 as a separating member, as shown. However, this is exemplary and the cavities V1, V2, V3 may be defined by other separating members, such as microcup structures or microcapsule shells, as is well known in the art.
  • the cavities V1, V2, V3, alone or in combination with one or more other adjacent cavities, may constitute one subpixel or pixel.
  • the electrophoretic display apparatus 1000R may include electrodes 41 and 42 for driving the particles 100R, 100G, 100B, and 100K; PR, PG, PB, and PK.
  • the electrodes 41 and 42 may be configured to face each other so as to generate an electric field perpendicular to the main surfaces of the substrates 21 and 22, as shown.
  • the electrodes 22 disposed on the lower substrate 21 are individual electrodes 42R, 42G, 42B that can be independently addressed for each pixel by a suitable switching element such as a transistor, and the electrodes on the upper substrate 22 ( 41 may be a common electrode opposite the individual electrodes 42.
  • the transparent electrode may include, for example, Indium-Tin-Oxide (ITO), Fluorinated Tin Oxide (FTO), Indium Oxide (IO), and Tin Oxide; It may be formed of any one or a combination of a transparent metal oxide such as SnO 2 ), a transparent conductive resin such as polyacetylene, or a conductive resin containing conductive metal fine particles.
  • ITO Indium-Tin-Oxide
  • FTO Fluorinated Tin Oxide
  • IO Indium Oxide
  • Tin Oxide Tin Oxide
  • It may be formed of any one or a combination of a transparent metal oxide such as SnO 2 ), a transparent conductive resin such as polyacetylene, or a conductive resin containing conductive metal fine particles.
  • the above-described electrode configuration is exemplary and the present invention is not limited thereto. For example, it may have a known in-plane configuration or a combination thereof.
  • Individual electrodes 42 may be driven by an active matrix comprising transistors 50 as switching elements.
  • transistors 50 as switching elements.
  • Fluid U may be a solution or gas of one or more dielectric liquids. Fluid U may be colored with dyes and / or pigments.
  • Electrophoretic particles (100R, 100G, 100B, 100K; PR, PG, PB, PK) have a positive or negative charge, any one of pigments, dyes, metal particles, metal oxide particles and resins or these It can be formed into a mixture of.
  • a mixture particle of a pigment and a polymer may be used, and the mixture particle may be a pigment coated on the surface of the polymer particle or a composition in which the pigment is dispersed in the polymer.
  • the particles disclosed in the applicant's Korean application No. 10-2010-0086456 can be used, the matters disclosed in these patent documents are hereby incorporated by reference in their entirety.
  • the particles 100R, 100G, 100B, 100K; PR, PG, PB, PK may have a size of several tens of micro to submicron levels to have suitable electrophoretic mobility.
  • the particles may have a size of 0.02 ⁇ m to 50 ⁇ m or less.
  • the size of the particles may be in a relatively small range of 0.02 ⁇ m to 10 ⁇ m, and in the case of a dry drive, the size of the particles may be in the range of 0.02 ⁇ m to 50 ⁇ m.
  • each cavity V1, V2, and V3 may be filled with particles having one kind of color and electrophoretic mobility, or three or more kinds of particles having different color and / or electrophoretic mobility.
  • the particles 100R, 100G, 100B (PR, PG, PB) dispersed in the cavities V1, V2, and V3 may have red, green, and blue colors, respectively, in order to realize multi colors by the RGB color system. have.
  • the particles 100R, 100G, 100B (PR, PG, PB) may implement a multi color by the CMY color system, and in this case, may have cyan, magenta, and yellow colors, respectively.
  • the other particles 100K (PK) may have white or black depending on the color system.
  • the particles 100R, 100G, 100B of FIG. 3A have a circularity of less than 0.930 to 1 and a particle size distribution of 10% to 40%, according to an embodiment of the present invention, and the particles of FIG. PR, PG, PB) have a perfect sphere with a circularity of 1 and a particle size distribution of 0%.
  • the particles 100R, 100G, 100B; PR, PG, PB have red, green and blue, respectively, charged with +, other particles 100K (PK) are black,-polarity Assume that we have
  • each particle 100R, 100G, 100B, 100K; PR, PG, PB, PK will be distributed as shown in Figs. 2A and 2B, respectively.
  • the incident light i is reflected by the particles 100R, 100G (PR, PG), and as a result, wavelengths of red and green color to the observer 1, respectively. Light with will be delivered.
  • the incident light i is absorbed and turned off by the black particles 100K and PK, and no light is transmitted to the observer 1.
  • the observer 1 observes the color in which the red light (iR; iR ') and the green light (iG; iG') which are reflected light are mixed.
  • the filling state of the particle layer PL distributed on the common electrode side is good, so that only a few layers may provide excellent light shielding power. You can get it. Accordingly, the black particles 100K, which should not be visible to the observer 1, are sufficiently covered by the particle layer PL so that they are not reflected to the observer 1. In particular, even if the dielectric fluid U is transparent without being colored with a dye or pigment that may mask the black particles 100K, such as gray, since the black particles behind it may be covered by the color particles 100R and 100G. Contrast can be significantly improved, and color reproducibility can be improved.
  • the particle layer PL distributed on the common electrode side has a poor filling state due to the point contact and the uniform size, thereby providing sufficient light shielding force by the empty space in the particle layer PL. Can not get Thus, the intensity of the reflected light is reduced, and the contrast and color reproducibility of the display information are reduced.
  • black particles PK may be illuminated which should not be visible to the observer 1 by transmitted light iT. This immersion phenomenon causes a reduction in color reproducibility in a display device including particles having two or more different colors in a pixel or subpixel.
  • the color particles have been described above, those skilled in the art can realize that the same advantages can be obtained by designing the black and / or white particles to have a predetermined circularity and / or particle size distribution even in a monochrome monochrome display device. have.
  • the above embodiments relate to an electrophoretic display device having a partition structure, the same advantages can be obtained in an electrophoretic display device having a microcapsule structure, a microcup structure, or other various types of cavity structures and polymer dispersed structures. It can be obvious.
  • the above-described embodiments disclose an electrophoretic display device as a finished product, but form cavities defined by suitable separating members between supporting substrates that do not include a drive element, so that the layer indicated by 70 in FIG. 3A (light conversion layer). May comprise an image media layer (or image sheet).
  • the electrophoretic display apparatus 1000 as illustrated in FIG. 3A may be provided by bonding the image media layer to the substrate on which the driving element is formed by using an adhesive layer.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

La présente invention se rapporte à des particules électrophorétiques ainsi qu'à un dispositif d'affichage et à une feuille d'image qui comprennent celles-ci. La circularité de chacune des particules électrophorétiques destinées à un dispositif d'affichage électrophorétique selon un mode de réalisation de la présente invention, est déterminée par la figure 1A suivante, la circularité n'étant pas inférieure à 0,930 et étant inférieure à 1. La répartition de la taille des particules est comprise entre 10 % et 40 % et est déterminée par la formule mathématique suivante 2 (où A représente une zone projetée d'une particule projetée de manière bidimensionnelle et P représente le périmètre de la particule projetée de manière bidimensionnelle66) : [Formule mathématique 2] répartition de la taille des particules = (â/á) × 100 (où, á est un diamètre moyen arithmétique des tailles des particules et â est un écart type des tailles des particules).
PCT/KR2011/006561 2010-09-03 2011-09-05 Particules électrophorétiques, et dispositif d'affichage et feuille d'image qui comprennent celles-ci Ceased WO2012030199A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100086745A KR20120024084A (ko) 2010-09-03 2010-09-03 전기 영동 입자들, 이를 포함하는 디스플레이 장치 및 이미지 시트
KR10-2010-0086745 2010-09-03

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WO2012030199A2 true WO2012030199A2 (fr) 2012-03-08
WO2012030199A3 WO2012030199A3 (fr) 2012-05-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112014297A (zh) * 2020-09-22 2020-12-01 中建西部建设西南有限公司 一种机制砂颗粒粒形的评价方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002202531A (ja) * 2000-12-28 2002-07-19 Fuji Xerox Co Ltd 画像表示媒体および画像形成装置
JP2004198882A (ja) * 2002-12-20 2004-07-15 Fuji Xerox Co Ltd 表示デバイス用粒子群、これを用いた画像表示媒体および画像形成装置
JP2006292880A (ja) * 2005-04-07 2006-10-26 Canon Inc 電気泳動表示素子及び電気泳動表示装置
KR20100077095A (ko) * 2008-12-27 2010-07-07 엘지디스플레이 주식회사 전기영동 디스플레이 장치 및 이의 제조방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112014297A (zh) * 2020-09-22 2020-12-01 中建西部建设西南有限公司 一种机制砂颗粒粒形的评价方法
CN112014297B (zh) * 2020-09-22 2024-04-02 中建西部建设西南有限公司 一种机制砂颗粒粒形的评价方法

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WO2012030199A3 (fr) 2012-05-03

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