Method for driving two layer variable transmission display

Patent metadata

Field	Value
Publication number	US-11029576-B2
Application number	US-201916662533-A
Country	US
Kind code	B2
Filing date	Oct 24, 2019
Priority date	May 21, 2010
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

An electro-optic display comprising at least two separate layers of electro-optic material, with one of these layers being capable of displaying at least one optical state which cannot be displayed by the other layer. The display is driven by a single set of electrodes between which both layers are sandwiched, the two layers being controllable at least partially independently of one another. Another form of the invention uses three different types of particles within a single electrophoretic layer, with the three types of particles being arranged to shutter independently of one another.

First claim

The invention claimed is:

1. A method for driving a variable transmission display comprising a first layer and a second layer of microcavity electro-optic material, wherein the display comprises a first light-transmissive electrode disposed on one side of the first and second layers, and a second light-transmissive electrode disposed on the opposed side of the first and second layers from the first electrode, there being no electrode between the first and second layers, wherein the first layer of microcavity electro-optic material comprises a fluid but is essentially free from pigment particles, the method comprising:
providing a first voltage between the first electrode and the second electrode, thereby creating a substantially opaque state in which charged pigment particles in the second layer of microcavity electro-optic material are dispersed within the microcavity; and
providing a second voltage between the first electrode and the second electrode, thereby creating a light-transmissive state in which charged pigment particles in the second layer of microcavity electro-optic material are concentrated within the microcavity.

2. The method according to claim 1 , wherein the microcavities in the first layer and the microcavities in the second layer are different sizes.

3. The method according to claim 1 , wherein the fluids in the first and second layers differ in at least one of viscosity and electrical conductivity.

4. The method according to claim 1 , wherein the substantially opaque state and the light-transmissive state are bistable.

Assignees

• E Ink Corp

Inventors

• Telfer Stephen J
• Paolini Jr Richard J
• Sainis Sunil Krishna
• Hill Randal M
• Moran Isaac W
• Yezek Lee
• Bouchard Alain
• Vetterling William
• Harris George G
• Morgan Hywel
• Slominski Luke
• Anseth Jay William
• Morrison Jennifer M
• Herb Craig A

Classifications

• G02F1/1347

  Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells · CPC title

• G02F2001/1678

  characterised by the composition or particle type · CPC title

• G02F2201/16

  series; tandem · CPC title

• G02F1/1681

  having two or more microcells partitioned by walls, e.g. of microcup type · CPC title

• G02F1/1676

  Electrodes · CPC title