Color Electrophoretic Display Waveforms for Artifact-Free Partial Updates

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Solution Overview

Problem

Existing electro-optic displays, particularly particle-based electrophoretic displays, suffer from image artifacts such as blooming and edge effects during partial updates, which degrade image quality and user experience.

Innovation Solution

A method is introduced where neighboring pixels are updated with alternate waveforms to maintain their optical state during partial updates, effectively reducing or eliminating edge artifacts by alternating between paired instruction sets to ensure that pixels at risk of blooming are driven to maintain their original state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If partial updates are performed to reduce power consumption and update time, then energy efficiency and productivity are improved, but image artifacts such as blooming and edge effects occur

Engineering Contradiction:

Improvepower consumptionVSAvoidimage artifacts

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by updating border pixels before the actual image update. The method identifies pixels adjacent to regions undergoing partial updates and applies corrective waveforms to these border pixels in advance, preventing blooming and edge artifacts from occurring during the subsequent partial update operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements preliminary anti-action by applying counteracting waveforms to border pixels that oppose the harmful effects of partial updates. The corrective waveforms are designed to preemptively counteract the blooming and edge effects that would otherwise occur at the boundaries of updated regions, eliminating artifacts before they manifest.

Inventive Principle:

Principle #9Preliminary anti-action

2Loss of time

If partial updates are used to update only changed regions, then update time is reduced, but edge artifacts appear at boundaries between updated and non-updated regions

Engineering Contradiction:

Improveupdate timeVSAvoidedge artifacts

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by identifying and updating border pixels before the main partial update operation. The controller determines which pixels lie at the boundaries of regions to be updated and applies corrective waveforms to these pixels in advance, ensuring that when the partial update occurs, no edge artifacts or blooming effects appear at the transitions between updated and non-updated regions.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If conventional driving methods are used during partial updates, then device complexity is minimized, but blooming and ghosting effects degrade image quality

Engineering Contradiction:

Improvedriving method complexityVSAvoidimage quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent implements feedback by analyzing the relationship between updated regions and their adjacent border pixels. The controller identifies pixels that are likely to be affected by partial updates based on their spatial relationship to updated regions, and applies corrective waveforms accordingly. This feedback mechanism improves image quality without requiring complex additional hardware.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach significantly reduces the visibility of edge artifacts like blooming, ensuring consistent image quality during partial updates without the need for precise tracking of pixel states, thus enhancing the display's appearance and user experience.

Implementation Method 1

a material having first and second display states differing in at least one optical property, the material being changed from its first to its second display state by application of an electric field to the material

Methodology Applied

Scientific EffectElectro-optic effect: Electro-Optic Effects

Implementation Method 2

particle-based electrophoretic displays in which one or more types of electrically charged particles are present in a fluid and are moved through the fluid under the influence of an electric field

Methodology Applied

Scientific EffectElectrophoresis: Electrophoresis

Data Source

PatentUS12603063B2Color electrophoretic displays incorporating methods for reducing image artifacts during partial updates

Publication Date: 2026.04.14 E INK CORP

AI summary

A color electrophoretic display that includes sets of duplicative waveforms to reduce visible artifacts during image updates. Such methods include driving extra pixels where the boundary between a driven and undriven area would otherwise lead to artifact by providing paired sets of driving instructions, allowing the undriven area to be driven while maintain the desired (undriven) optical state.