Magnetophoretic display assembly and driving scheme

Patent metadata

Field	Value
Publication number	US-10444553-B2
Application number	US-201514666040-A
Country	US
Kind code	B2
Filing date	Mar 23, 2015
Priority date	Mar 25, 2014
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

The present invention is directed to a magnetophoretic display assembly and a driving scheme for such a display assembly. It provides a low-cost imaging display assembly which is capable of displaying desired re-writeable images. A single driving element can be used to display images on any number of individual imaging films.

First claim

What is claimed is:

1. A magnetophoretic display device, comprising:
a magnetic sheet having a magnetic pattern thereon,
and
a magnetophoretic imaging film comprising a substrate and a plurality of at least one of microcells and microcapsules applied to the substrate, the microcells and microcapsules containing a fluid, non-magnetic particles, and magnetic particles.

2. The device of claim 1 , wherein said magnetic sheet comprises magnetic particles dispersed in a polymeric matrix.

3. The device of claim 1 , wherein the magnetic sheet has a thickness in the range of 12 μm to 10 mm.

4. The device of claim 1 , further comprising a pattern-generating means configured to generate the magnetic pattern in the magnetic sheet.

5. The device of claim 4 , wherein the pattern-generating means is an electromagnet.

6. The device of claim 4 , wherein the pattern-generating means is a stylus.

7. The device of claim 4 , wherein the pattern-generating means is in the form of a stamp with a pre-determined pattern.

8. The device of claim 4 , wherein the pattern-generating means is a magnet mounted on a computer controlled read-write head.

9. The device of claim 1 , wherein the fluid comprises a solvent.

10. The device of claim 1 , wherein the non-magnetic particles are white.

11. The device of claim 10 , wherein the white non-magnetic particles are formed from an inorganic pigment.

12. The device of claim 10 , wherein the white non-magnetic particles are polymer particles having a refractive index of >1.5 and of a size of >100 nm.

13. The device of claim 1 , wherein the magnetic particles are formed from highly magnetic compounds and metals or alloys.

14. The device of claim 1 , wherein the magnetic particles are formed from a material selected from the group consisting of gamma ferric oxide, acicular magnetite, cobalt-modified or adsorbed ferric oxide, berthollide ferric oxide, chromium dioxide, metals or alloys and organic polyradicals.

15. The device of claim 4 , wherein the pattern-generating means is formed of a neodymium magnet.

16. A packaging in combination with a device according to claim 1 , wherein the magnetic sheet is incorporated in the packaging and the packaging is configured such that the magnetophoretic imaging film forms an image of the magnetic pattern when applied to a surface of the packaging in proximity to the magnetic sheet.

Assignees

• E Ink California Llc

Inventors

• Laxton Peter B

Classifications

• B42D25/369

  Magnetised or magnetisable materials · CPC title

• G02F1/09 Primary

  based on magneto-optical elements, e.g. exhibiting Faraday effect · CPC title

• G02F2001/094

  Physics · mapped topic

• G02F1/094

  based on magnetophoretic effect · CPC title