Color sets for low resolution dithering in reflective color displays

• US 10,353,266 B2
• Filed: 09/25/2015
• Issued: 07/16/2019
• Est. Priority Date: 09/26/2014
• Status: Active Grant

• Current Assignee: E Ink Corporation (E Ink Holdings Incorporated)
• Original Assignee: E Ink Corporation (E Ink Holdings Incorporated)
• Inventors: Bouchard, Alain, Telfer, Stephen J.
• Primary Examiner(s): Thomas, Brandi N
• Application Number:
  US14/866,322
• Publication Number:
  US 20160091770A1
• Time in Patent Office: 1,390 Days
• Field of Search: 359237, 359242, 359265-267, 359290-292, 359295, 359296, 359298, 359315, 359321, 359322, 345107
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 2001/1678 characterised by the composition or particle type
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/2044 using dithering
• CPC Class Codes: G09G 3/344 based on particles moving in a fluid or in a gas, e.g. electrophoretic devices electrophoretic devices per se G02F1/167

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

1. An electrophoretic display comprising a plurality of pixels for generating a color image, each pixel capable of rendering no less than 8 colors and no more than 64 colors, wherein two colors have a C* value less than 5 and six colors have a C* value greater than 10, and wherein of the six colors having a C* value greater than 10, one color has h°

between 1 and 60 degrees, one color has h°

between 60 degrees and 120 degrees, one color has h°

between 120 and 180 degrees, one color has h°

between 180 and 240 degrees, one color has h°

between 240 and 300 degrees, and one color has h°

between 300 and 360 degrees.

2. An electrophoretic display of claim 1, wherein the 2 colors having a C* value less than 5 are white and black.