Touch Panel Pressure Mapping for Ghost-Free Multi-Touch

Solution Overview

Problem

Self-capacitive touch panels struggle to accurately recognize multiple touched points during multi-touch, leading to 'ghost points' that interfere with position detection and reduce user experience.

Innovation Solution

A touch panel design incorporating a touch electrode layer with touch regions and a pressure sensing layer, where sensing assemblies in the pressure sensing layer determine the actual touched points by sensing pressed points, distinguishing them from ghost points.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If self-capacitive touch panel uses multiple touch points for multi-touch recognition, then touch functionality is improved, but coordinate accuracy deteriorates due to ghost points

Engineering Contradiction:

Improvemulti-touch recognition capabilityVSAvoidcoordinate accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The touch panel is divided into multiple touch regions, each corresponding to a specific sensing assembly. This segmentation allows the system to independently process and attribute touch events to specific regions, preventing coordinate confusion and ghost points while maintaining multi-touch capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A mapping relationship is introduced as an intermediary between the touch electrode layer and pressure sensing layer. This mapping serves as a mediator that associates touched points with their corresponding pressed points, enabling accurate coordinate determination even during multi-touch events.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If touch panel detects multiple touched points simultaneously, then touch responsiveness is improved, but detection accuracy deteriorates due to coordinate confusion

Engineering Contradiction:

Improvetouch responsivenessVSAvoidtouched point detection accuracy

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The touch panel is divided into multiple touch regions, each corresponding to a specific sensing assembly. This segmentation allows the system to independently process and attribute touch events to specific regions, preventing coordinate confusion and ghost points while maintaining multi-touch capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A mapping relationship is introduced as an intermediary between the touch electrode layer and pressure sensing layer. This mapping serves as a mediator that associates touched points with their corresponding pressed points, enabling accurate coordinate determination even during multi-touch events.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If self-capacitive touch panel uses traditional single-layer structure, then device complexity is reduced, but touch detection accuracy deteriorates under multi-touch conditions

Engineering Contradiction:

Improvepanel structure complexityVSAvoidtouch position detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent transitions from a single-layer capacitive structure to a multi-layer structure with a pressure sensing layer added in the vertical dimension. This dimensional change enables the system to distinguish between actual touches and ghost points by detecting pressure changes, thereby improving detection accuracy without excessive complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The touch panel integrates multiple functions into a unified structure: the touch electrode layer detects touched points, the pressure sensing layer detects pressed points, and the mapping relationship provides coordinate association. This multi-functionality enables accurate multi-touch recognition while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12625587B2Touch panel, display module, and display device

Publication Date: 2026.05.12 HKC CORP LTD

AI summary

A touch panel is provided. The touch panel includes a touch electrode layer and a pressure sensing layer. The touch electrode layer includes multiple touch regions. The pressure sensing layer includes multiple sensing assemblies. Positions of the multiple sensing assemblies correspond to positions of the multiple touch regions, respectively. The touch electrode layer is configured to sense multiple touched points. The multiple touched points include at least two actually touched points. The multiple sensing assemblies are configured to sense pressed points. Each of the pressed points is used to determine one touch region where one actually touched point is located. A display module and a display device are further provided.