CA2588371A1 - Electrophoretic display medium and display device - Google Patents

Electrophoretic display medium and display device Download PDF

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Publication number
CA2588371A1
CA2588371A1 CA002588371A CA2588371A CA2588371A1 CA 2588371 A1 CA2588371 A1 CA 2588371A1 CA 002588371 A CA002588371 A CA 002588371A CA 2588371 A CA2588371 A CA 2588371A CA 2588371 A1 CA2588371 A1 CA 2588371A1
Authority
CA
Canada
Prior art keywords
particles
display medium
electrophoretic display
medium according
treated
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.)
Granted
Application number
CA002588371A
Other languages
French (fr)
Other versions
CA2588371C (en
Inventor
Man-Chung Tam
Naveen Chopra
Michael S. Hawkins
Richard P. N. Veregin
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.)
Xerox Corp
Original Assignee
Xerox Corp
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Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of CA2588371A1 publication Critical patent/CA2588371A1/en
Application granted granted Critical
Publication of CA2588371C publication Critical patent/CA2588371C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Abstract

An electrophoretic display medium includes one or more set of colored particles in a dielectric fluid, wherein at least one of the one or more set of particles comprise colored particles having attached to an external surface thereof surface treated additive particles. The display medium is included in an electrophoretic display device by including the medium in a multiplicity of individual reservoirs of a display layer or layers that is located between conductive substrates.

Claims (24)

1. ~An electrophoretic display medium, comprising one or more set of colored particles in a dielectric fluid, wherein at least one of the one or more set of particles comprise colored particles having attached to an external surface thereof additive particles.
2. ~The electrophoretic display medium according to claim 1, wherein the display medium has an electrical conductivity of about 10 -11 to about 10 -15 S/m.
3. ~The electrophoretic display medium according to claim 1, wherein the at least one set of particles is comprised of from about 0.1 to about 20% by weight of the particles of the additive particles.
4. ~The electrophoretic display medium according to claim 1, wherein the additive particles comprise at least one of surface treated silicon dioxide, surface treated titanium dioxide, surface treated titanic acid, surface treated cerium oxide, surface treated calcium stearate and surface treated zinc stearate, and have an average size of from about 5 nm to about 250 nm.
5. ~The electrophoretic display medium according to claim 4, wherein the additive particles have an average size of from about 30 nm to about 140 nm.
6. ~The electrophoretic display medium according to claim 1, wherein the additive particles comprise, or are treated with an agent comprised of, at least one of a halogen-containing compound, a silane compound, and a combination thereof.
7. ~The electrophoretic display medium according to claim 6, wherein the agent is a halogen-containing compound selected from the group consisting of ethylene-chlorotrifluoroethylene copolymer (ECTFE), ethylene-tetrafluoroethylene (ETFE), polytetrafluoroethylene (PTFE), polytetrafluoroethylene fluorinated ethylene propylene (PTFE-FEP), polytetrafluoroethylene perfluoroalkoxy (PTFE-PFA), polyvinylidene fluoride (PVDF), and mixtures thereof.
8. ~The electrophoretic display medium according to claim 6, wherein the agent is a silane compound selected from the group consisting of alkylsilanes, alkoxysilanes, alkylalkoxysilanes, fluorosilanes, and mixtures thereof, wherein the alkylalkoxysilanes include an alkyl group containing from 1 to about 25 carbon atoms, and wherein the alkylsilanes and the alkoxysilanes include an alkyl group containing from 1 to about 15 carbon atoms.
9. ~The electrophoretic display medium according to claim 6, wherein the agent is a silane compound that is an alkylalkoxysilane represented by:

wherein R represents an alkyl group and A, B, and C independently represent alkoxy groups.
10. ~The electrophoretic display medium according to claim 6, wherein the agent is a silane compound selected from the group consisting of hexamethyldisilane (HMDS), decyltriethoxysilane (DTES), decyltrimethoxysilane (DTMS), polydimethylsiloxane (PDMS), octyltriethoxysilane (OTES), octyltrimethoxysilane (OTMS), (heptadecafluoro-1,1,2,2-tetrahydrodecyl)triethoxysilane (FDTES), (tridecafluoro-1,1,2,2-tetrahydrooctyl)triethoxysilane, i-butyltrimethoxysilane, n-propyltrimethoxysilane, n-butyltrimethoxysilane, n-hexyltrimethoxysilane, n-decyltrimethoxysilane, 3,3,3-trifluortrimethoxysilane and mixtures thereof.
11. ~The electrophoretic display medium according to claim 1, wherein the additive particles are selected from the group consisting of silica treated with PDMS, silica treated with HMDS, silica treated with a mixture of HMDS and aminopropyltriethoxysilane, silica treated with a mixture of HMDS and aminopropyltriethoxysilane, silica treated with octylsilane, titania treated with at least one of i-butyltrimethoxysilane, n-propyltrimethoxysilane, n-butyltrimethoxysilane, n-hexyltrimethoxysilane, n-decyltrimethoxysilane and 3,3,3-trifluortrimethoxysilane, and combinations thereof.
12. ~The electrophoretic display medium according to claim 1, wherein the at least one set of particles is comprised of emulsion aggregation polymer particles.
13. ~The electrophoretic display medium according to claim 1, wherein the at least one set of colored particles has a charge of from about ~0.1 to about ~20 µC/g.
14. ~The electrophoretic display medium according to claim 1, wherein the at least one set of colored particles include a colorant selected from the group consisting of pigment, dye, and combinations thereof.
15. ~The electrophoretic display medium according to claim 1, wherein the fluid comprises from about 10% to about 95% by weight of the display medium and the at least one set of colored particles comprises from about 5% to about 50%
by weight of the display medium.
16. ~The electrophoretic display medium according to claim 1, wherein the at least one set of particles has an average particle size of from about 0.5 to about 25 µm, an upper geometric standard deviation (GSD) by volume for (D84/D50) is in the range of from about 1.1 to about 1.25, and an average circularity of about 0.92 to about 0.99.
17. ~A method of forming a display medium comprised of one or more set of colored particles in a dielectric fluid, wherein at least one of the one or more set of particles comprise colored particles having attached to an external surface thereof additive particles, the method comprising forming the colored particles from materials including at least one binder and at least one colorant;
providing additive particles;
blending the additive particles with the colored particles to attach the additive particles to an external surface of the colored particles; and dispersing the colored particles with the additive particles on an external surface thereof in the dielectric fluid.
18. ~The method according to claim 17, wherein the providing the additive particles comprises treating the additive particles with at least one treating agent to achieve surface treated additive particles.
19. ~The method according to claim 17, wherein the forming of the colored particles is via emulsion aggregation.
20. ~An electrophoretic display device, comprising a multiplicity of individual reservoirs containing a display medium between conductive substrates, at least one of which is transparent, wherein the display medium comprises one or more set of colored particles in a dielectric fluid, wherein at least one of the one or more set of particles comprise colored particles having attached to an external surface thereof additive particles.
21. ~The electrophoretic display device according to claim 20, wherein the display medium has an electrical conductivity of about 10 -11 to about 10 -15 S/m.
22. ~The electrophoretic display device according to claim 20, wherein the at least one set of colored particles has a charge of from about ~0.1 to about ~20 µC/g.
23. ~The electrophoretic display device according to claim 20, wherein the additive particles comprise at least one of surface treated silicon dioxide, surface treated titanium dioxide, surface treated titanic acid, surface treated cerium oxide, surface treated calcium stearate and surface treated zinc stearate, and have an average size of from about 5 nm to about 250 nm.
24. ~The electrophoretic display device according to claim 20, wherein the additive particles comprise, or are treated with an agent comprised of, at least one of a halogen-containing compound, a silane compound, and a combination thereof.
CA2588371A 2006-05-19 2007-05-11 Electrophoretic display medium and display device Expired - Fee Related CA2588371C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/419,463 US7426074B2 (en) 2006-05-19 2006-05-19 Electrophoretic display medium and display device
US11/419,463 2006-05-19

Publications (2)

Publication Number Publication Date
CA2588371A1 true CA2588371A1 (en) 2007-11-19
CA2588371C CA2588371C (en) 2012-09-18

Family

ID=38430490

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2588371A Expired - Fee Related CA2588371C (en) 2006-05-19 2007-05-11 Electrophoretic display medium and display device

Country Status (5)

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US (1) US7426074B2 (en)
EP (1) EP1857862A3 (en)
JP (1) JP2007310401A (en)
CN (1) CN101075058B (en)
CA (1) CA2588371C (en)

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JPWO2009104752A1 (en) * 2008-02-20 2011-06-23 株式会社ブリヂストン Display medium particle, information display panel using the same, and method for producing display medium particle
JP4544358B2 (en) * 2008-09-25 2010-09-15 富士ゼロックス株式会社 Display particles, display particle dispersion, display medium, and display device
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JPWO2010125830A1 (en) * 2009-04-30 2012-10-25 株式会社ブリヂストン Particles for display media
JP5477224B2 (en) * 2010-08-12 2014-04-23 日立化成株式会社 Light control film
JP5547015B2 (en) * 2010-09-28 2014-07-09 三菱鉛筆株式会社 White particles for electrophoretic ink and electrophoretic ink using the same
JP5899220B2 (en) * 2010-09-29 2016-04-06 ポスコ Method for manufacturing flexible electronic device using roll-shaped mother substrate, flexible electronic device, and flexible substrate
KR101248014B1 (en) * 2011-02-17 2013-03-27 한국생산기술연구원 METHOD FOR TREATING SURFACE OF PARTICLE FOR E-PAPER USING EXTERNAL ADDITIVE OF SiO2 AND PARTICLE FOR E-PAPER USING EXTERNAL ADDITIVE OF SiO2 PREPARED BY USING THE METHOD
KR101248012B1 (en) * 2011-02-17 2013-03-27 한국생산기술연구원 METHOD FOR MANUFACTURING OF PARTICLE EXTERNAL ADDITIVE FOR E-PAPER USING SiO2 AND PARTICLE EXTERNAL ADDITIVE FOR E-PAPER USING SiO2 PREPARED BY USING THE METHOD
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Also Published As

Publication number Publication date
US7426074B2 (en) 2008-09-16
US20070268559A1 (en) 2007-11-22
CA2588371C (en) 2012-09-18
CN101075058B (en) 2011-05-25
JP2007310401A (en) 2007-11-29
EP1857862A2 (en) 2007-11-21
CN101075058A (en) 2007-11-21
EP1857862A3 (en) 2007-11-28

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Effective date: 20160511