Display device

Patent metadata

Field	Value
Publication number	US-9465261-B2
Application number	US-201214354836-A
Country	US
Kind code	B2
Filing date	Oct 16, 2012
Priority date	Oct 28, 2011
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

The invention relates to a display device ( 10 ), in particular in the form of a multi-layer film body. The display device ( 10 ) has, in a first area ( 22 ), a first electrode ( 41 ), a second electrode ( 42 ), a third electrode ( 43 ) and a display layer ( 122 ) with a display material. The display layer ( 122 ) is arranged between the first electrode ( 41 ) and the second electrode ( 42 ). The third electrode ( 43 ) is arranged on the side of the display layer ( 122 ) facing away from the first electrode ( 41 ). The first electrode ( 41 ) is formed as an isolated electrode. The first electrode ( 41 ) overlaps both the second electrode ( 42 ) and the third electrode ( 43 ) at least in areas when viewed perpendicular to the plane spanned by the display layer ( 122 ).

First claim

The invention claimed is:

1. A display device in the form of a multi-layer film body, wherein the display device has, in a first area, a first electrode, a second electrode, a third electrode and a display layer with a display material, wherein the display layer is arranged between the first electrode and the second electrode, and the third electrode is arranged on the side of the display layer facing away from the first electrode, wherein the first electrode is not galvanically connected to an electric potential and, when viewed perpendicular to the plane spanned by the display layer, the first electrode at least partially overlaps both the second electrode and the third electrode, and, when viewed in a direction perpendicular to the plane spanned by the display layer, the second electrode has a shape of a motif arranged in a motif area and, when viewed in a direction perpendicular to the plane spanned by the display layer, the third electrode has a shape corresponding to the shape of the motif in a background area, with the result that, when there is a voltage polarity applied to the second and third electrodes, the display material of the display layer in the motif area shows a first optical property and the display material of the display layer in the background area shows a second optical property contrasting the first optical property, whereby a representation of the motif is visually displayed by the display layer, and upon a change in polarity of the voltage applied to the second and third electrodes, the display material of the display layer in the motif area shows the second optical property and the display material of the display layer in the background area shows the first optical property, whereby an inverted representation of the motif results, in which the color of the motif area and the color of the background area are swapped with each other.

2. A display device according to claim 1 , wherein the first electrode is encapsulated by dielectric layers.

3. A display device according to claim 1 , wherein the first, second and/or third electrodes are formed transparent.

4. A display device according to claim 1 , wherein the first electrode completely overlaps a whole surface area of the second and the third electrode.

5. A display device according to claim 1 , wherein the display device has a power source and/or an electrical control circuit and the second and third electrodes, but not the first electrode, are galvanically connected to the power source or control circuit via a connection element.

6. A display device according to claim 5 , wherein the power source is a piezo element, a solar cell, a battery and/or an antenna.

7. A display device according to claim 1 , wherein the display material is formed such that, when a voltage is applied between the second and the third electrode, it shows different colors, in the overlap area of the first and second electrodes and in the overlap area of the first and the third electrode.

8. A display device according to claim 1 , wherein the display material has a plurality of electrically charged particles which are dispersed in a liquid, wherein the liquid and the particles differ in terms of their color.

9. A display device according to claim 1 , wherein the display material has a plurality of first particles and a plurality of second particles, wherein the first particles differ from the second particles in relation to their electric charge and in relation to their optical properties, wherein the first particles are positively charged and the second particles are negatively charged.

10. A display device according to claim 9 , wherein the first particles and the second particles show different optical properties when viewed under incident light, which is reflected or scattered back to the observer.

11. A display device according to claim 1 , wherein at least one of the second and third electrodes comprise a plurality of partial electrodes, the partial electrodes being connected by strip conductors, wherein the strip conductors have a width of less than 100 μm.

12. A display device according to claim 1 , wherein the second and third electrodes are shaped and arranged such that when there is a change in polarity of the voltage applied to the second and third electrodes, the illusion of a movement of an object is shown as an optical effect.

13. A display device according to claim 12 , wherein the second and third electrodes comprise a plurality of partial electrodes arranged together in a shape of a rotationally symmetrical object, wherein the partial electrodes of the second electrode and the partial electrodes of the third electrode are arranged alternating.

14. A display device according to claim 1 , wherein the second electrode has several partial electrodes galvanically connected to each other, wherein the partial electrodes are arranged in at least one direction with a spacing of less than 300 μm, wherein each of the partial electrodes have a punctiform or linear shape.

15. A display device according to claim 14 , wherein the width of the partial electrodes or the spacing between the partial electrodes are varied to generate a grayscale image.

16. A display device according to claim 14 , wherein the third electrode is shaped over a whole surface or in an inverted pattern relative to the second electrode.

17. A display device according to claim 14 , wherein the grid is a geometrically transformed grid and the partial electrodes have the shape of a wavy line.

18. A display device according to claim 14 , wherein the partial electrodes are connected to each other by means of a plurality of strip conductors, which are arranged according to a regular or irregular grid.

19. A display device according to claim 1 , wherein the second and third electrodes are arranged in one plane, and are formed by separate areas of a common electrically conductive layer.

20. A display device according to claim 1 , wherein the second and the third electrode differ in terms of their spacing from the first electrode and are formed by areas of different electrically conductive layers which are spaced apart from each other in relation to the normal relative to the plane spanned by the first electrode.

21. A display device according to claim 20 , wherein a dielectric layer is arranged between the second and the third electrode.

22. A display device according to claim 20 , wherein the second electrode is arranged between the first electrode and the third electrode and the second electrode and the third electrode overlap in relation to the plane spanned by the display layer at least in areas, and overlap by less than 50%.

23. A display device according to claim 20 , wherein the second electrode is arranged between the first electrode and the third electrode and the third electrode completely overlaps the second electrode in relation to the plane spanned by the display layer.

24. A display device according to claim 20 , wherein the distance between the first and second electrodes, the distance between the first and third electrodes and the distance between the second and third electrodes are chosen such that c 23 is smaller than 1/(1/c 12 +1/c 13 ), wherein c 12 is the capacitance between the first and second electrodes, c 13 is the capacitance between the first and third electrodes and c 23 is the capacitance between the second and third electrodes.

25. A display device according to claim 20 , wherein the third el

Assignees

• Polylc Gmbh & Co Kg
• Leonhard Kurz Stiftung & Co Kg
• Ovd Kinegram Ag
• Polyic Gmbh & Co Kg

Inventors

• Stahl Rainer
• Ludwig Klaus
• Schad Johannes
• Tompkin Wayne Robert

Classifications

• G02F1/167

  by electrophoresis · CPC title

• G02F1/155

  Electrodes · CPC title

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G09G3/16

  by control of light from an independent source · CPC title

• G09F9/372

  the positions of the elements being controlled by the application of an electric field · CPC title