Liquid Crystal Display Electrode Segmentation for Impurity Trapping

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing liquid crystal devices face issues with ionic impurities aggregating within the pixel area, leading to image ghosting and deterioration in display quality, as previous configurations fail to efficiently trap negative and positive ionic impurities outside the pixel area.

Innovation Solution

The liquid crystal device incorporates first and second peripheral electrodes extending along the outer edges of the pixel area, with the first electrode applying a potential higher than the common potential and the second electrode applying a potential lower than the common potential, effectively trapping negative and positive ionic impurities at the periphery, preventing them from entering the pixel area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a first peripheral electrode and a second peripheral electrode are disposed in parallel at the outside of a pixel area, then ionic impurities can be trapped outside the pixel area, but negative ionic impurities cannot be efficiently trapped when the second electrode acts as a barrier

Engineering Contradiction:

Improveimpurity trapping efficiencyVSAvoidelectrode configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The peripheral electrode structure is segmented into four independent electrodes (first and second electrodes on each of the two opposite sides), allowing each electrode to independently trap ionic impurities approaching from different directions, thereby eliminating the barrier effect and improving trapping efficiency

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different electrodes are assigned different potentials (higher than common potential for first electrodes, lower than common potential for second electrodes) to create localized electric field zones that specifically attract and trap negative and positive ionic impurities respectively at different locations around the pixel area

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If electrodes are disposed on only three sides of the pixel area, then manufacturing is simplified, but ionic impurities directed toward the side without electrodes are not trapped and aggregate within the pixel area

Engineering Contradiction:

Improveelectrode fabrication simplicityVSAvoiddisplay quality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The electrode configuration is segmented to cover all four sides of the pixel area with independent first and second electrodes, ensuring that ionic impurities approaching from any direction are trapped outside the pixel area, thereby preventing aggregation within the display region and maintaining high display quality

Inventive Principle:

Principle #1Segmentation

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 configuration efficiently traps both negative and positive ionic impurities outside the pixel area, thereby suppressing their aggregation within the display region and reducing image quality degradation.

Implementation Method 1

first electrodes which extend along the pixels arranged in the first direction on both sides of the pixel area, and to which a potential higher than a common potential is applied, and second electrodes which extend along the pixels arranged in the first direction on both sides of the pixel area, and to which a potential lower than the common potential is applied

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS10859880B2Liquid crystal display device comprising first and second electrodes respectively disposed outside of diagonally opposite first and second corner portions of a pixel area

Publication Date: 2020.12.08 SEIKO EPSON CORP

AI summary

In a liquid crystal device, on a first substrate, a first electrode to which a potential higher than a common potential is applied and a second electrode to which a potential lower than the common potential is applied are provided at the outside of a pixel area. The first electrode and the second electrode respectively extend along different portions of the outer edge of the pixel area, and are not parallel to each other. At least one of the first electrode and the second electrode is provided on all sides of the pixel area. For example, the first electrodes extend across the entirety or substantially entirety of the first side and the second side, and the second electrodes extend across the entirety or substantially entirety of the third side and the fourth side.