# US 2019/0171082 A1 · Grayscale Color Electronic Paper

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- Number: US 2019/0171082 A1
- Document ID: US20190171082A1
- Status: Published application
- Kind: A1
- Application number: 16/325,008
- Filed: 2016-12-08
- Published: 2019-06-06
- Earliest claimed: 2016-08-15
- Assignees: Dalian Dke Lcd Co., Ltd.
- Applicants: Dalian Dke Lcd Co., Ltd.
- Inventors: Jinggang ZHAO; Lina ZHANG; Zhiling HE
- Web page: https://patentgrep.com/patent/US20190171082A1

## CPC

- G02F 1/167: by electrophoresis
- G02F 1/133: Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements (arrangements or circuits for control of liquid crystal elements in a matrix, not structurally associated with these elements G09G3/36)
- G02F 1/13718: {based on a change of the texture state of a cholesteric liquid crystal}
- G02F 1/1677: Structural association of cells with optical devices, e.g. reflectors or illuminating devices
- G09G 3/34: by control of light from an independent source
- G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
- G02F 2203/30: Gray scale
- 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
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A grayscale color electronic paper have a plurality of pixel structural units, each of them has a base color layer and a grayscale adjusting layer. The base color layer is able to display two or more colors. Colors displayed by the grayscale adjusting layer corresponds one-to-one to the colors displayed by the base color layer. The base color layer and the grayscale adjusting layer have respective driving structures. The base color layer can display colors such as black, white, red, green, blue, cyan, magenta and yellow; and the grayscale adjusting layer has multi-level grayscales, and each level of the gray scale has a steady state at a zero electric field.

## Claims

### Claim 1

A grayscale color electronic paper, wherein each pixel structural unit comprising a base color layer and a grayscale adjusting layer, the base color layer being able to display two or more colors, the colors displayed by the grayscale adjusting layer corresponding one-to-one to the colors displayed by the base color layer, and the base color layer and the grayscale adjusting layer having respective driving structures.

### Claim 2 (depends on 1)

The grayscale color electronic paper according to claim 1, wherein each color displayed by the base color layer has a steady state at a zero electric field.

### Claim 3 (depends on 1)

The grayscale color electronic paper according to claim 1, wherein the base color layer is a reflective structure.

### Claim 4 (depends on 1)

The grayscale color electronic paper according to claim 1, wherein the grayscale adjusting layer has multi-level grayscales, each level of the grayscales has a steady state at a zero electric field, and a color of grayscale level or a transparent color of grayscale level can be displayed.

### Claim 5 (depends on 1)

The grayscale color electronic paper according to claim 1, wherein the grayscale adjusting layer is a transmissive structure.

### Claim 6 (depends on 1)

The grayscale color electronic paper according to claim 1, wherein an outer edge of the base color layer is smaller than an outer edge of the grayscale adjusting layer.

### Claim 7 (depends on 2)

The grayscale color electronic paper according to claim 2, wherein the base color layer is a reflective structure.

### Claim 8 (depends on 4)

The grayscale color electronic paper according to claim 4, wherein the grayscale adjusting layer is a transmissive structure.