# US 10,372,008 B2 · Electro-optic displays

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- Number: US 10,372,008 B2
- Document ID: US10372008B2
- Status: Granted
- Kind: B2
- Application number: 13/475,193
- Filed: 2012-05-18
- Published: 2012-11-22
- Granted: 2019-08-06
- Earliest claimed: 2011-05-21
- Assignees: E Ink Corporation
- Applicants: Stephen J. Telfer; Richard J. Paolini, Jr.; Michael D. McCreary; David John Cole
- Inventors: Stephen J. Telfer; Richard J. Paolini, Jr.; Michael D. McCreary; David John Cole
- Web page: https://patentgrep.com/patent/US10372008B2

## CPC

- G02F 1/167: by electrophoresis
- G02F 1/16757: Microcapsules
- G02F 2201/343: cholesteric liquid crystal reflector
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A wavelength selective reflection display (10) comprises a wavelength selective reflection medium (20) and a backing member (30) having a first, non-reflective optical state, and a second, reflective optical state. Both the wavelength selective reflection medium (20) and the backing member (30) are divided into pixels (40, 50, 60), and the backing member (30) is switchable between its first and second optical states on a pixel-by-pixel basis. The pixels of the backing member (30) are substantially aligned with those of the wavelength selective reflection medium (20).

## Claims

### Claim 1

A wavelength selective reflection (WSR) display comprising a wavelength selective reflection medium capable of undergoing a dimensional change in response to an electro-activated process so as to reflect any color of light, the wavelength selective reflection medium having a plurality of pixels and, disposed adjacent the wavelength selective reflection medium, a backing member having a plurality of pixels and having a first, non-reflective optical state, and a second, reflective optical state, the backing member being switchable between its first and second optical states on a pixel-by-pixel basis, the pixels of the backing member being substantially aligned with the pixels of the wavelength selective reflection medium,
wherein the backing member is placed on the opposed side of the wavelength selective reflection medium from the viewer, and comprises a layer of electro-optic material capable of being switched between a reflective state and a non-reflective state, or a reflective state and a transmissive optical state.

### Claim 2 (depends on 1)

A WSR display according to claim 1 wherein the backing member has at least one intermediate gray level having a reflectivity intermediate its first and second optical states.

### Claim 3 (depends on 1)

A WSR display according to claim 1 wherein the backing member comprises a variable medium having a reflective state and a substantially light-transmissive state, and a non-varying dark surface disposed on the opposed side of the variable medium from the WSR medium.

### Claim 4 (depends on 1)

A WSR display according to claim 1 wherein the backing member comprises a variable medium having a non-reflective state and a substantially light-transmissive state, and a non-varying reflective surface disposed on the opposed side of the variable medium from the WSR medium.

### Claim 5 (depends on 1)

A WSR display according to claim 1 wherein the backing member comprises a variable medium having reflective, non-reflective and light-transmissive states.

### Claim 6 (depends on 5)

A WSR display according to claim 5 further comprising a light source disposed on the opposed side of the variable medium from the WSR medium.

### Claim 7 (depends on 1)

A WSR display according to claim 1 wherein the electro-optic material comprises a rotating bichromal member, electrochromic or electro-wetting material.

### Claim 8 (depends on 1)

A WSR display according to claim 1 wherein the electro-optic material comprises an electrophoretic material comprising a plurality of electrically charged particles disposed in a fluid and capable of moving through the fluid under the influence of an electric field.

### Claim 9 (depends on 8)

A WSR display according to claim 8 wherein the electrically charged particles and the fluid are confined within a plurality of capsules or microcells.

### Claim 10 (depends on 8)

A WSR display according to claim 8 wherein the electrically charged particles and the fluid are present as a plurality of discrete droplets surrounded by a continuous phase comprising a polymeric material.

### Claim 11 (depends on 8)

A WSR display according to claim 8 wherein the fluid is gaseous.

### Claim 12 (depends on 1)

A WSR display according to claim 1 wherein the WSR medium is an electrically-addressable photonic crystal.