Color electrophoretic display with segmented top plane electrode to create distinct switching areas

Patent metadata

Field	Value
Publication number	US-12019348-B2
Application number	US-202217982281-A
Country	US
Kind code	B2
Filing date	Nov 7, 2022
Priority date	Sep 10, 2014
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A color electrophoretic display with distinct switching areas formed by a segmented top plane electrode opposite driving pixel electrodes. The distinct areas are programmed to switch at different times, thereby reducing the “flashiness” seen by a viewer during an image update. In one embodiment, the color electrophoretic medium of the display includes a reflective white particle and three other sets of particles, each comprising a different subtractive color.

First claim

The invention claimed is:

1. A color electrophoretic display having a plurality of distinct switching areas, the color electrophoretic display comprising:
a single active matrix backplane including driving pixel electrodes coupled to thin film transistors (TFTs);
a segmented top plane electrode opposite the driving pixel electrodes, wherein different portions of the segmented top electrode create distinct switching areas across the single active matrix backplane; and
a color electrophoretic medium disposed between the driving pixel electrodes and the segmented top plane electrode, wherein the color electrophoretic medium includes a set of charged reflective white particles and three additional sets of charged particles, wherein each of the three additional sets comprises a different subtractive color, and wherein the set of charged reflective white particle and three additional sets of charged particles move between the single active matrix backplane and the segmented top plane electrodes when an electric field is provided between the single active matrix backplane and the segmented top plane electrodes.

2. The color electrophoretic display of claim 1 , wherein the segmented top electrode segregates the color electrophoretic display into blocks of driving pixels that switch at different times.

3. The color electrophoretic display of claim 1 , wherein the segmented top electrode segregates the color electrophoretic display into interdigitated portions of driving pixels that switch at different times.

Assignees

• E Ink Corp

Inventors

• Telfer Stephen J
• Paolini Jr Richard J
• Amundson Karl Raymond
• Crounse Kenneth R
• Bouchard Alain
• Sainis Sunil Krishna

Classifications

• G02F2001/1678

  characterised by the composition or particle type · CPC title

• G09G2310/068

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

• G09G3/3406

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G3/344

  based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167) · CPC title

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title