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Electrophoresis display medium, component and method for using the same component to display image

A technology of electrophoretic display and display medium, which is applied in the direction of instruments, nonlinear optics, optics, etc., which can solve the problems of increased power consumption and slow switching speed of displays, and achieve the effect of fast and reliable response to electric field and low energy cost

Inactive Publication Date: 2007-11-21
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high conductivity of the ink results in increased power consumption and slower switching speeds of the display
[0005] Although known electrophoretic display devices, compositions and methods for displaying images using such known devices are suitable for their intended purposes, there is still a need to display and / or change images stably over a long period of time and reliably and quickly, and in particular Electrophoretic display with full color images

Method used

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  • Electrophoresis display medium, component and method for using the same component to display image
  • Electrophoresis display medium, component and method for using the same component to display image
  • Electrophoresis display medium, component and method for using the same component to display image

Examples

Experimental program
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Effect test

Embodiment 1

[0227] In this example, the use of emulsion aggregated particles in two particle electrophoretic displays is demonstrated.

[0228] Preparation of negatively charged emulsion aggregated cyan particles. Cyan toner particles were prepared by aggregating styrene / butyl acrylate / carboxylic acid terpolymer non-crosslinked resin particles, styrene / butyl acrylate / carboxylic acid and diethylene in the presence of two cationic coagulants. A dispersion of a second crosslinked copolymer resin of phenylbenzene and a cyan pigment to provide aggregates, which are then coalesced at a temperature above the Tg of the non-crosslinked resin to provide spherical particles. These particles were then washed (4 times) with deionized water, dried, and dry blended with an additive package comprising at least silica surface treated with polydimethylsiloxane (PDMS) and primary particle size is about 40nm. Another additive that can be used is titanic acid with alkyl functionality and a primary particle ...

Embodiment 2

[0232] In this example, the use of a silicone fluid as a fluid in a display medium with emulsion aggregated particles is demonstrated.

[0233] Two colors of emulsion aggregated toner particles were mixed with DOW 200 5 cSt fluid in a mass ratio of 1 : 1 for a solids loading of about 25%. Zirconia beads are added as a mixing aid to uniformly disperse the mixture of toner particles in the fluid. No additional external charge control agent was added.

[0234] The display medium was sandwiched between 2 parallel plates separated by 145 μm spacer spacers. A square wave voltage of + / - 200V was applied to the two plates and a color transition was observed as the two toners migrated back and forth between the two plates.

Embodiment 3

[0235] Maleic anhydride is introduced into the emulsion aggregated particles in the latex step. To bulk polymerized styrene / butyl acrylate (200ml, -20% conversion, Mn = 1,900) was added maleic anhydride (16g). The mixture was heated to ~50°C until all the maleic anhydride was dissolved. This material was added to an aqueous solution (600 g water and sodium dodecylbenzenesulfonate (SDBS) 16 g) and stirred for 5 min. The mixture obtained was piston homogenized 3 times at 500 bar and then transferred to a 1 LBUCHI reactor. The latex microemulsion was deoxygenated using argon pressurization and then decompression (5 times). The material was then heated to 135°C. After 1 hour at this temperature, ascorbic acid solution (8.5 ml at a concentration of 0.1 g / ml) was added by pump at a rate of 0.035 ml / min. The reaction was cooled after 6 hours to provide ~200 microns resin in latex at 24.9% solids, Mn = 9,700 and Mw = 23,000.

[0236] The latex is aggregated using diamines. To th...

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Abstract

Provided is an electrophoretic display medium, comprising one or more set of colored particles in a dielectric fluid, and wherein at least one of the one or more set of particles comprise particles having thereon at least one polyelectrolyte coating.

Description

technical field [0001] An electrophoretic display device is described herein. More specifically, electrophoretic display devices comprising colorant particles capable of field-induced charging are described. The electrophoretic display device herein is capable of producing images including full-color images. The electrophoretic displays herein can be used in any display application, and in particular any display application in which the displayed image can be changed, including, for example, reimageable paper, electronic books, electronic signs, watches, monitors and / or mobile phone displays wait. [0002] One advantage of field-induced charging is that the display's colored particles can be made to respond more quickly and reliably to an electric field in a displayed image, potentially at a lower energy cost. This allows electrophoretic display devices to be used in displays requiring fast image switching capabilities, such as monitors. Background technique [0003] Ele...

Claims

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Application Information

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IPC IPC(8): G02F1/167
CPCG02F1/167
Inventor S·-M·杨N·乔普拉V·M·法鲁加M·C·谭P·M·卡兹迈尔
Owner XEROX CORP
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