Liquid Crystal Display Electrode Structure for Low-Resistance Touch Sensing

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Solution Overview

Problem

Existing liquid crystal display apparatuses with transverse electric fields face issues of increased resistance and display nonuniformity due to common electrodes formed from island-like structures, which can lead to disconnection and voids in sensor electrodes, affecting touch position detection accuracy and display quality.

Innovation Solution

The implementation of a common electrode structure with second electrodes connecting first electrodes and sensor electrodes, arranged below the sensor electrodes, ensuring they are not across pattern ends, thereby maintaining low resistance and preventing disconnection or void formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If common electrodes are formed from island-like structures, then device complexity is reduced, but resistance increases and display nonuniformity occurs

Engineering Contradiction:

Improvecommon electrode structureVSAvoidresistance and display uniformity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The common electrode is divided into multiple first electrodes arranged in an island-like pattern, reducing overall complexity while maintaining electrical connectivity through second electrodes that connect these segmented structures

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Second electrodes are introduced as intermediary connecting elements between the first electrodes and sensor electrodes, ensuring low resistance pathways and preventing disconnection issues

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If sensor electrodes are arranged across pattern ends of common electrodes, then manufacturing is simplified, but disconnection and voids occur

Engineering Contradiction:

Improvesensor electrode arrangementVSAvoidelectrode connection quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

Second electrodes serve as intermediary structures positioned between the first electrodes and sensor electrodes, providing stable connection points that prevent disconnection and void formation while maintaining manufacturing simplicity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrode structure is arranged in multiple layers with second electrodes positioned below sensor electrodes, creating a three-dimensional configuration that avoids pattern end issues while maintaining ease of manufacture

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If transverse electric field is used, then view angle is improved, but resistance increases due to common electrode structure

Engineering Contradiction:

Improveview angleVSAvoidresistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The common electrode is segmented into multiple first electrodes connected by second electrodes, creating multiple parallel current pathways that reduce overall resistance while maintaining the transverse electric field configuration for wide viewing angles

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple first electrodes and second electrodes are combined to form an integrated common electrode structure that provides low resistance while supporting the transverse electric field mode for improved view angle

Inventive Principle:

Principle #5Merging (Combining)

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 design results in a liquid crystal display apparatus with low-resistance, high-quality sensor electrodes, enhancing touch position detection sensitivity and maintaining high display quality by avoiding resistance increases and display nonuniformity.

Implementation Method 1

the display producing an image as a result of the modulation factor of light passing through the liquid crystal layer being controlled in accordance with an electric field between a pixel electrode and a common electrode

Methodology Applied

Scientific EffectLiquid crystal modulation: Liquid Crystals

Implementation Method 2

controlling the liquid crystal alignment state by applying, to the liquid crystal layer, a longitudinal electric field in a direction almost perpendicular to the substrate surfaces

Methodology Applied

Scientific EffectElectric field alignment: Electric Field

Implementation Method 3

controlling the liquid crystal alignment state by applying, to the liquid crystal layer, a transverse electric field (including even a fringe electric field) in a direction almost parallel to the surfaces of the paired substrates

Methodology Applied

Scientific EffectElectric field alignment: Electric Field

Data Source

PatentUS20250298275A1Liquid crystal display apparatus

Publication Date: 2025.09.25 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a liquid crystal display apparatus includes a display region including a plurality of display pixels arrayed in a matrix, an array substrate including a plurality of first electrodes which are arrayed in a matrix, second electrodes which are arranged on the same layer as a layer of the first electrodes and connect the first electrodes to each other, and third electrodes which are arrayed in a matrix on the first electrodes and the second electrodes, a countersubstrate which is arranged to face the array substrate, and a liquid crystal layer which is interposed between the array substrate and the countersubstrate.