Touch Display Panel With Floating Electrode Edge Compensation

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Solution Overview

Problem

The integrity of the electrode pattern at the edge of a touch panel is often incomplete due to factors like screen display region size, pixel size, and through holes, affecting touch performance.

Innovation Solution

A touch display panel design that includes a base substrate with a touch metal layer featuring touch patterns and traces, where missing regions in the patterns are compensated by integrally connecting floating electrodes with pattern sub-blocks to enhance the self-capacitance and optimize electrical parameters, particularly at the edges and corners.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the electrode pattern is arranged in the display region, then the touch detection function is provided, but the electrode pattern at the edge becomes incomplete affecting touch performance

Engineering Contradiction:

Improvetouch performanceVSAvoidelectrode pattern integrity

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The electrode pattern is divided into multiple sub-blocks, with at least one sub-block intentionally designed as a missing sub-block at the edge region. This segmentation allows the electrode pattern to adapt to the display region boundary while maintaining functional integrity through the missing sub-block configuration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the electrode pattern are designed with different structures: complete pattern blocks in the central display region and missing pattern blocks at the edge region. This local differentiation optimizes touch performance by adapting the electrode structure to the specific requirements of each region, particularly addressing the incomplete edge pattern issue.

Inventive Principle:

Principle #3Local quality

2Area of stationary object

If the display region size is increased, then the screen area is enlarged, but the electrode pattern at the edge becomes more incomplete

Engineering Contradiction:

Improvedisplay region areaVSAvoidelectrode pattern completeness

Core Design Contradiction:

Area of stationary objectVSShape

Solution Approach 1:

The electrode pattern is segmented into multiple sub-blocks arranged in an array, with missing sub-blocks strategically positioned at edge regions. This segmentation enables the pattern to scale with the display region while maintaining structural adaptability at the boundaries.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode pattern extends into the peripheral region beyond the display region boundary, utilizing the space in another dimension (outside the active display area) to complete the electrode structure where it would otherwise be truncated by the display region edge.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If through holes are added to the display panel, then the display functionality is enhanced, but the electrode pattern integrity is compromised

Engineering Contradiction:

Improvedisplay functionalityVSAvoidelectrode pattern continuity

Core Design Contradiction:

Adaptability or versatilityVSShape

Solution Approach 1:

The electrode pattern is divided into sub-blocks that can be selectively positioned around through holes. Missing sub-blocks are arranged to accommodate the through holes while maintaining overall pattern functionality, allowing the electrode structure to adapt to the presence of through holes in the display panel.

Inventive Principle:

Principle #1Segmentation

4Measurement precision

If the electrode pattern is optimized for the central region, then the touch detection is improved, but the edge region performance deteriorates

Engineering Contradiction:

Improvetouch detection accuracyVSAvoidedge touch performance

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The electrode pattern uses different sub-block configurations for different regions: complete pattern blocks in the central region for optimal touch detection and missing pattern blocks at the edge region to adapt to boundary conditions. This local quality differentiation ensures both central and edge region performance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of trying to make the complete electrode pattern work at the edge, the invention inverts the approach by deliberately creating missing sub-blocks at the edge region, accepting the incomplete pattern as a design feature rather than a defect to be corrected.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS12411571B2Touch display panel and display device

Publication Date: 2025.09.09 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

The present disclosure provides a touch display panel and a display device. The touch display panel comprises: a base substrate, comprising a display region and a peripheral region surrounding the display region; and a touch metal layer, comprising touch patterns at least partially of which is in the display region, and touch traces in the peripheral region; wherein: each of the touch pattern comprises a plurality of pattern sub-blocks; at least one floating electrode is provided in each of the plurality of pattern sub-block; a touch pattern, of the touch patterns, with a partial missing region is regarded as a missing touch pattern; and in a pattern sub-block where the missing region is located, the at least one floating electrode is integrally and electrically connected with the pattern sub-block.