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 know

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
Comparison scheme
Effect test

Example Embodiment

Example 1

[0228] In this example, the use of emulsion aggregated particles in two types of particle electrophoretic displays is shown.

[0229] Prepare a negatively charged emulsion to gather cyan particles. Cyan toner particles are 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 the second crosslinked copolymer resin of benzene and the cyan pigment to provide aggregates, and then the aggregates are coalesced at a temperature higher than the Tg of the non-crosslinked resin to provide spherical particles. These particles are then washed with deionized water (4 times), dried, and dry blended with an additive package including at least silica, which is surface-treated with polydimethylsiloxane (PDMS) and has a primary particle size It is about 40nm. Another additive that can be used is titanic acid with alkyl func...

Example Embodiment

Example 2

[0233] In this embodiment, the use of silicone fluid as a fluid in a display medium with emulsion aggregated particles is demonstrated.

[0234] The two-color emulsion aggregated toner particles were mixed with DOW 200 5 cSt fluid at a mass ratio of 1:1 for a solid 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 is added.

[0235] The display medium is 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 when the two toners migrated back and forth between the two plates.

Example Embodiment

Example 3

[0236] Maleic anhydride is introduced into the emulsion aggregate particles in the latex step. Maleic anhydride (16g) was added to the bulk polymerized styrene / butyl acrylate (200ml, ~20% conversion rate, Mn=1,900). 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 16 g of sodium dodecylbenzene sulfonate (SDBS)) and stirred for 5 min. The obtained mixture was piston homogenized 3 times under 500 bar and then transferred to a 1L BUCHI reactor. The latex microemulsion was deoxygenated by pressurizing with argon and then depressurizing (5 times). This material was then heated to 135°C. After 1 hour at this temperature, the ascorbic acid solution (8.5 ml at a concentration of 0.1 g / ml) was added through a pump at a rate of 0.035 ml / min. The reaction was cooled after 6 hours to provide a ~200 micron resin in latex with a solids content of 24.9%, Mn=9,700 and Mw=23,000.

[0237] Use di...

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Abstract

The present invention provides an electrophoretic display device (65), comprising a multiplicity of individual reservoirs (61) containing a display medium (60) between conductive substrates (56), at least one of which is transparent, wherein the display medium comprises one or more set of colored particles in a dielectric fluid, wherein the display medium has an electrical conductivity of about 10 -11 to about 10 -15 S/m, and wherein the multiplicity of individual reservoirs are defined by a unitary grid whose walls segregate the reservoirs. The invention further provides a method of forming an electrophoretic display device (65), comprising forming a mold having a grid pattern defining individual reservoirs; forming a master stamp in the mold, and removing the master stamp from the mold; forming a grid by filling the master stamp with a material of the grid; and filling a multiplicity of the individual reservoirs (61) of the grid with a display medium (60) comprised of one or more set of colored particles in a dielectric fluid and locating the grid between conductive substrates (56). Moreover, the invention provides a method of forming an electrophoretic display device (65), comprising forming a film comprised of a material of a grid; exposing the film through a photomask and developing the film to achieve a grid having a desired grid pattern defining individual reservoirs; adhering the grid to a conductive substrate; and filling a multiplicity of the individual reservoirs of the grid with a display medium comprised of one or more set of colored particles in a dielectric fluid and adhering an additional conductive substrate to an open side of the grid.

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): G02F1/167G02F1/1679
CPCG02F2001/1672G02F1/167G02F1/1681G02F1/1679G02F2001/1678G02F2202/04
Inventor N·乔普拉J·H·丹尼尔B·S·克鲁索尔S·-M·杨P·M·卡茨迈尔G·伊夫泰姆
Owner XEROX CORP
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