Electromagnetic driving multi-color display device, display writing device and method for making same

An electromagnetic drive, multi-color display technology, applied in identification devices, reusable writing boards, printing and other directions, can solve the problems of thick device, poor contrast effect of different colors, difficult to control the mobility of different field effects, etc.

Active Publication Date: 2005-11-02
GUANGZHOU OED TECH INC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) It is not easy to modify locally. If there is a writing or painting error, it is necessary to erase the entire picture and start over;
[0004] (2) The color is monotonous and it is difficult to write thin lines. The color is usually only black and white. Although multiple two-color panels can be combined to produce more than three colors, each individual splicing area is still limited to two colors;
[0005] (3) The whole device is thicker and does not have the lightness of paper;
[0006] (4) Large-area devices are difficult to manufacture due to the need to encapsulate the liquid that suspends magnetic particles and white particles
However, it will be very difficult to realize this technology. Not only is it difficult to control the different field-effect mobility of particles, but also because of the certain distribution of particle charge and mobility, there will be mutual intersection, which makes the contrast effect of different colors poor.

Method used

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  • Electromagnetic driving multi-color display device, display writing device and method for making same
  • Electromagnetic driving multi-color display device, display writing device and method for making same
  • Electromagnetic driving multi-color display device, display writing device and method for making same

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specific example

[0047] A specific example of the surface chemical modification method can be the method disclosed in US Patent 5,035,803 (Cohen et al., July 30, 1991) using vinyl silane surface treatment and then using free radical reaction to grow polymer chains. According to this principle, the iron powder dispersion required in this embodiment can be prepared. Specific examples are as follows:

[0048] In a heatable mixer, add 5.0 grams of sieved metal carbonyl fine powder (BASF, Germany) with a particle size of <1 micron, 15.0 grams of hydrocarbon solvent Isopar G (ExxonMobil, USA), 0.01 grams of methyl Acrylic functional group titanate KR133DS (Kenrich, USA) was mixed for 30 minutes at a stirring speed of 500 rpm for surface treatment. Under a nitrogen environment and a condensing reflux device, add 3.0 gram of lauryl alcohol methacrylate (U.S. Aldrich Company), 26.5 gram of hydrocarbon solvent Isopar G (U.S. ExxonMobil Company) in the above-mentioned mixture, heat to 70 degree, slowly ...

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PUM

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Abstract

The invention discloses multicolor display device, read and write display device by electromagnetic drive and preparation method. Containing microsphere in display layer comprises magnetic field control particle, first and second electric field control particles, all of which can move acted by the electromagnetic field; the color of particles are different to each other; when preparing display material, take surface chemical modification to magnetic field control particle; take surface macromolecule modification to electric field control particles; add electrophoresis particle charge control agent to form tricolor particle suspending liquid; use coater to control dose of aforementioned display material; block and solidify on coating display layer of conducting base material; coat one protection layer on display layer; when reading and writing, use electric field reverse switch to select forward direction, reverse direction and broken control electric field; by control of electric pen and magnetic field pen, show rich colors on read and write display device, and fit to request of large scale preparation and produe.

Description

technical field [0001] The invention relates to a display writing device, in particular to an electromagnetically driven multi-color display device, a display writing device and a manufacturing method thereof. Background technique [0002] Traditional writing devices include blackboards, notebooks, etc. The former needs to use chalk and cause dust to fly, while the latter requires constant replacement of paper. For many years, efforts have been made to develop writing devices that do not require chalk or changing paper. At present, there are several reusable display writing devices on the market, such as the magnetophoretic device used on children's toys, which uses magnetic particles and white particles for comparison. There is a magnet at the tip of the pen, which uses a magnetic field to write. It can be written on a white background. Produces a black pattern. Although simple, this device has several disadvantages, such as: [0003] (1) It is not easy to modify locally...

Claims

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Application Information

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IPC IPC(8): G09F9/37
Inventor 漳立冰陈宇
Owner GUANGZHOU OED TECH INC
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