# US 12,181,766 B2 · Color sets for low resolution dithering in reflective color displays color sets for low resolution dithering in reflective color displays

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- Number: US 12,181,766 B2
- Document ID: US12181766B2
- Status: Granted
- Kind: B2
- Application number: 18/385,404
- Filed: 2023-10-31
- Published: 2024-02-22
- Granted: 2024-12-31
- Earliest claimed: 2014-09-26
- Assignees: E Ink Corporation
- Applicants: E Ink Corporation
- Inventors: Alain Bouchard; Stephen J. Telfer
- Web page: https://patentgrep.com/patent/US12181766B2

## CPC

- G02F 1/167: by electrophoresis
- G09G 3/2044: {using dithering}
- G09G 3/344: {based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167)}
- G02F 2001/1678: {characterised by the composition or particle type}
- G02F 2201/52: RGB geometrical arrangements
- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2340/06: Colour space transformation
- 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

The present invention provides for a method of rendering an image on a reflective display wherein each pixel is capable of rendering a limited number of colors, each of which is rendered by predetermined set of waveforms stored in a waveform lookup table. Furthermore, the present invention provides for a method for rendering an image using such colors, having been chosen for optimal color rendition. This invention further provides for rendering a color image formed from a plurality of pixels on a reflective display wherein each pixel has a color selected from the group consisting of at least: red, green, blue, cyan, magenta, yellow, black and white.

## Claims

### Claim 1

An electrophoretic display comprising a plurality of pixels for generating a color image, each pixel capable of rendering no less than 16 colors and no more than 64 colors, wherein
4 colors have a chroma (C*) value less than 5, and of the 4 colors having a C* value less than 5, one color is white, one color is black and two colors are gray tones equally spaced between white and black, and
12 colors have a C* value greater than 10, and of the 12 colors having a C* value greater than 10, two colors have a hue angle (h°) between 1 and 60 degrees, two colors have h° between 60 degrees and 120 degrees, two colors have h° between 120 and 180 degrees, two colors have h° between 180 and 240 degrees, two colors have h° between 240 and 300 degrees, and two colors have h° between 300 and 360 degrees.