Touchscreen Crack Detection via Layer Distance Measurement

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Solution Overview

Problem

Touchscreen displays often suffer from reduced performance due to cracks, which can cause touch inputs to be offset from intended targets, making it difficult or impossible to select desired icons, especially if the crack severity is significant.

Innovation Solution

A method and system that measures the distance between layers of a touchscreen display, detects changes in this distance to identify cracks, and adjusts system parameters to compensate for the crack, allowing for accurate touch event detection and interaction by recalibrating touch locations or shifting screen widgets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a crack occurs in the touchscreen display layer, then the structural integrity is compromised, but the touchscreen can continue to detect and respond to touch inputs by adjusting parameters

Engineering Contradiction:

Improvetouchscreen functionalityVSAvoidlayer structural integrity

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The system dynamically adjusts touchscreen parameters based on detected crack locations. The controller modifies touch sensitivity, response thresholds, or active area definitions in real-time to compensate for structural damage, allowing the touchscreen to adapt its behavior rather than failing completely

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system proactively detects cracks and pre-adjusts parameters before complete functionality is lost. By identifying cracks early and compensating through parameter adjustment, the system prevents total touchscreen failure and maintains usability despite structural compromise

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Measurement precision

If a crack causes touch offset from underlying widgets, then touch accuracy deteriorates, but parameter adjustment can restore accurate touch detection

Engineering Contradiction:

Improvetouch location accuracyVSAvoidcrack detection complexity

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The system replaces complex optical or physical inspection methods with electrical resistance measurements to detect cracks. By measuring resistance changes across the touchscreen surface, the system can identify crack locations and their impact on touch accuracy without requiring sophisticated imaging or mechanical probing equipment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If the touchscreen system adjusts parameters to compensate for cracks, then continued operation is enabled, but additional processing and control complexity is introduced

Engineering Contradiction:

Improvedevice usabilityVSAvoidcrack detection and adjustment system

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system uses the existing touchscreen controller and resistance measurement infrastructure for dual purposes: normal touch operation and crack detection. The same electrical pathways used for touch sensing also serve to detect resistance changes caused by cracks, eliminating the need for separate dedicated detection hardware

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The touchscreen system performs self-diagnosis and self-correction by automatically detecting cracks through resistance measurements and autonomously adjusting its operational parameters. The system monitors its own structural integrity and compensates for damage without requiring external intervention or complex additional subsystems

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS10386963B2Detecting cracks on operatively coupled touchscreen display using pressure sense

Publication Date: 2019.08.20 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

A method of identifying a crack in a touchscreen display system includes measuring a distance between a first layer of the touchscreen display system and a second layer of the touchscreen display system, detecting a change in the distance at a portion of the touchscreen display system, identifying a crack in the first layer at the portion of the touchscreen display system based on the change in the distance, and adjusting one or more parameters of the touchscreen display system based on the crack in the first layer.