ELECTRONIC HANDWRITING SCREEN

• US 20130155490A1
• Filed: 08/01/2012
• Published: 06/20/2013
• Est. Priority Date: 08/03/2011
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhang, Zhuo
• Granted Patent: US 9,759,977 B2
• Time in Patent Office: Days
• US Class Current: 359/296
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/1679 Gaskets; Spacers; Sealing of cells; Filling or closing of cells
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

The embodiments of present invention disclose an electronic handwriting screen and relate to the field of electrophoretic display techniques. In the embodiment of present invention, because insulation spacing elements are provided between the electrophonic display functional film and the bottom electrode, when an appropriate voltage is applied between the top electrode and the bottom electrode, the top electrode is pressed so as to make the electrophonic display functional film contact with the bottom electrode, which shortens the distance between the top electrode and the bottom electrode and further increases the electric field force acting on the charged colorant particles; as a result, electrophoresis effect occurs in the electrophoresis liquid so that patterns are displayed or erased at the pressing location, and handwriting function is thereby realized without a touch screen, reducing the manufacturing costs for an electronic handwriting screen.

Claims

1. An electronic handwriting screen, comprising:

a top electrode, an electrophoretic display functional film and a bottom electrode, the electrophoretic display functional film being arranged between the top electrode and the bottom electrode,

wherein the electrophoretic display functional film and the bottom electrode are provided with insulation spacing elements therebetween, and the insulation spacing elements are used to create a gap between the electrophoretic display functional film and the bottom electrode.

2. The electronic handwriting screen according to claim 1, wherein a height of the gap is from 20 μ

m to 500 μ

m.

3. The electronic handwriting screen according to claim 1, further comprising a semiconductor film arranged on a surface of the electrophoretic display functional film on the side adjacent to the insulation spacing elements.

4. The electronic handwriting screen according to claim 3, wherein the semiconductor film has a thickness less than 200 μ

m and resistivity greater than 1000 ohms.cm.

5. The electronic handwriting screen according to claim 1, wherein the gap is provided with conductive structures therein, and a height of the conductive structure is less than that of the gap by at least 3 μ

m.

6. The electronic handwriting screen according to claim 5, wherein the conductive structure is made of a metal material, or the conductive structure is a structure coated with a conductor material on the surface thereof.

7. The electronic handwriting screen according to claim 1, wherein the insulation spacing elements are any one of ball spacer, pad spacer, post spacer, porous membrane, and the insulation spacing elements have resilience.

8. The electronic handwriting screen according to claim 1, wherein the bottom electrode is any one of flexible conductive substrate and metal sheet.

9. The electronic handwriting screen according to claim 1, wherein a ratio of the sum of the maximum cross-section area of all the insulation spacing elements to an area of the electrophoretic display functional film is less than 50%.

10. The electronic handwriting screen according to claim 1, wherein the gap is filled with an insulating liquid therein.

11. The electronic handwriting screen according to claim 1, wherein the bottom electrode is configured by a plurality of strip electrodes arranged in a side-by-side manner.

12. The electronic handwriting screen according to claim 11, wherein the strip electrode assume a wave-like shape.

13. The electronic handwriting screen according to claim 11, wherein the strip electrode has a strip width of 200 μ

m, and has a spacing to adjacent strip electrode of 15 μ

m.

14. The electronic handwriting screen according to claim 12, wherein the strip electrode has a strip width of 200 μ

m, and has a spacing to adjacent strip electrode of 15 μ

m.

15. An electronic handwriting screen device, composing:

an electronic handwriting screen according to claim 1;

a voltage inversing circuit; and

a power source input terminal, supplying power to the electronic handwriting screen through the voltage inversing circuit;

wherein the voltage inversing circuit is used for inversing the voltage supplied from the power source input terminal to the electronic handwriting screen, so as to apply a forward voltage or a reverse voltage between the top electrode and the bottom electrode of the electronic handwriting screen.