Methods for driving electro-optic displays

Patent metadata

Field	Value
Publication number	US-11423852-B2
Application number	US-201816128996-A
Country	US
Kind code	B2
Filing date	Sep 12, 2018
Priority date	Sep 12, 2017
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

A variety of methods for driving electro-optic displays so as to reduce visible artifacts are described. Such methods includes updating a display having a plurality of display pixels with a first image, identifying display pixels with edge artifacts after the first image update, and storing the identified display pixels information in a memory.

First claim

The invention claimed is:

1. A method for driving an electro-optic display having a plurality of display pixels comprising:
updating the display with a first image;
identifying display pixels with edge artifacts after the first image update using graytone transitional information of cardinal pixels to the plurality of display pixels;
creating a binary map indicating the locations of the identified display pixels with edge artifacts; and
storing the binary map in a memory,
wherein step of identifying display pixels with edge artifacts comprising flagging the identified pixels to a memory associated with the display's controller.

2. The method of claim 1 , wherein the step of identifying display pixels with edge artifacts comprising determining the graytone transitions of the display pixels.

3. The method of claim 1 , wherein the step of identifying display pixels with edge artifacts comprising determining displays pixels having different graytones than at least one of its cardinal neighboring pixels.

4. The method of claim 1 , wherein the step of storing the identified display pixels in a memory comprising storing the identified display pixels information in a binary map.

5. The method of claim 1 further comprising applying full clearing waveforms to the identified pixels with edge artifacts after at least two image updates.

6. The method of claim 1 , further comprising applying a waveform to the display pixels identified with edge artifacts.

7. The method of claim 6 , wherein the waveform is DC imbalanced.

8. The method of claim 6 , wherein the waveform is substantially DC balanced.

9. The method of claim 8 further comprising performing a post drive discharge.

Assignees

• E Ink Corp

Inventors

• Sim Teck Ping
• Ben-Dov Yuval
• Au Joanna F
• Crounse Kenneth R

Classifications

• G09G2320/0209

  Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G2310/068

  Application of pulses of alternating polarity prior to the drive pulse in electrophoretic displays · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title