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Robust multi particle system for color electrophoretic displays with very low driving voltages comprising a low amount of electrolytes

A technology of charged particles and particles, applied in instruments, organic dyes, nonlinear optics, etc., can solve the problems of large leakage current, power loss, frequent refresh of drive circuits, etc.

Active Publication Date: 2008-05-21
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] A disadvantage is that the presence of a large number of (molecular) charges leads to greater leakage currents within the device
This means power loss and more frequent refresh of the driver circuit

Method used

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Examples

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Embodiment Construction

[0016] In one aspect, the invention relates to an electrophoretic dispersion comprising at least two, preferably two, particle species, wherein each particle species comprises one or more charge-forming groups and / or one or Stabilizers (steric or otherwise), wherein said charge forming groups and stabilizers are associated with said particle species by covalent bonding or by non-covalent adsorption or association.

[0017] By combining or linking the stabilizer and charge forming groups to the particle species, only minimal amounts and concentrations are required in solution. Doing so can drastically reduce the ionic content of the dispersion. Prior to this, there were several stoichiometric equivalents of various ionic compounds, so that it was not uncommon to obtain functional electrophoretic dispersions. The present invention significantly reduces the type and amount of such ionic compounds, resulting in increased chemical robustness of the system. Furthermore, the electr...

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PUM

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Abstract

An electrophoretic dispersion with at least two particle species is proposed in which a minimal number (and concentration) of free compounds is present in solution. All chemicals needed to color and stabilize the pigment particles are preferably covalently attached to or within the particles. This enhances the robustness of the system and minimizes the conductivity of the dispersion so that the driving voltage for an electrophoretic display is reduced.

Description

technical field [0001] The present invention relates to an electrophoretic dispersion and particles capable of being contained therein. In particular, the present invention relates to an electrophoretic dispersion comprising small amounts of free electrolyte and other additives, and to the use of these dispersions and particles in electrophoretic displays having low driving voltage and low conductivity. Background technique [0002] Currently, research in the field of electrophoretic displays is focused on full-color electrophoretic displays, where each pixel has all colors. US 6117368 proposes a solution. [0003] US 6117368 discloses a two-stage polymerization process to form dielectric particles. This process involves the polymerization of a first monomer in a dispersion medium (which is different from the dielectric medium), thereby forming particles. A second monomer is provided in the same dispersion medium, polymerized and grafted onto the formed particles, whereby...

Claims

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Application Information

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IPC IPC(8): G02F1/167C09B67/00
CPCG02F1/167G02F2001/1678
Inventor P·J·贝斯尤L·J·M·施兰根
Owner SIGNIFY HLDG BV
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