Touch Sensor Electrode Grouping for ELVSS Ghost-Touch Suppression

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Solution Overview

Problem

Touch sensors in display panels experience issues with touch sensing sensitivity, cathode re-transmission phenomena due to rapid external temperature changes, and generation of various noises during touch sensing, particularly in larger screens like tablets.

Innovation Solution

A touch sensor design with a plurality of driving and reception electrodes, where reception electrodes are arranged in alternating groups with connection patterns, allowing for cancellation of noise signals through subtraction of signals from different electrode groups to improve sensitivity and reduce ghost touches.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a touch sensor is implemented with a single layer or double layer structure, then the device complexity is reduced, but touch sensing sensitivity deteriorates and ghost touches occur due to low ground mass

Engineering Contradiction:

Improvetouch sensor structureVSAvoidtouch sensing sensitivity

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The reception electrode is divided into multiple separate reception electrodes (first reception electrode and second reception electrode) arranged in different regions. This segmentation allows for better signal differentiation and noise cancellation, improving touch sensing accuracy without significantly increasing overall device complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A ground electrode layer is introduced as an intermediary element between the reception electrodes and the substrate. This ground electrode provides a reference potential and improves ground mass, thereby enhancing touch sensing sensitivity and preventing ghost touches while maintaining a relatively simple overall structure

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If the OLED panel resolution is increased to display more pixels, then the image quality is improved, but the touch sensor performance deteriorates due to increased noise and cathode re-transmission phenomena

Engineering Contradiction:

Improvedisplay resolutionVSAvoidtouch sensing accuracy

Core Design Contradiction:

Manufacturing precisionVSMeasurement precision

Solution Approach 1:

Noise signals from the cathode re-transmission phenomenon are extracted and identified by comparing signals from different reception electrodes. The sensing unit detects and removes these specific noise components, allowing high-resolution display operation without compromising touch sensing accuracy

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The sensing unit continuously monitors signals from multiple reception electrodes and dynamically adjusts noise cancellation based on the detected signal patterns. This feedback mechanism enables the system to adapt to varying display conditions and maintain accurate touch sensing across different resolution settings

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If rapid external temperature changes occur, then environmental adaptability is improved, but cathode re-transmission phenomena increase causing ghost touches

Engineering Contradiction:

Improvetemperature adaptabilityVSAvoidcathode re-transmission noise

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

Multiple reception electrodes are strategically positioned in advance to capture different signal components before noise contamination occurs. The ground electrode is also pre-positioned to establish a stable reference potential, enabling the system to preemptively counteract temperature-induced noise

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The temperature-induced cathode re-transmission signals, which are harmful in isolation, are converted into useful information by using them as reference signals for noise cancellation. The sensing unit uses these signals to identify and remove corresponding noise components from the touch sensing signals, thereby improving overall sensing accuracy under varying temperature conditions

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Enhances touch sensing sensitivity, prevents ghost touches caused by temperature changes, and eliminates noise signals, particularly in large display panels.

Implementation Method 1

cathode re-transmission phenomenon of the ELVSS layer

Methodology Applied

Scientific EffectCathode re-transmission phenomenon:

Implementation Method 2

cancels a noise signal caused by a cathode retransmission phenomenon of the ELVSS layer contained in each of a first sensing signal and a second sensing signal by subtracting the second sensing signal outputted through the second reception electrode patterns from the first sensing signal outputted through the first reception electrode patterns

Methodology Applied

Scientific EffectSignal subtraction:

Data Source

PatentUS20260064227A1Touch sensor and touch input device comprising same

Publication Date: 2026.03.05 HIDEEP INC

AI summary

A touch input device according to an embodiment of the present invention includes: a display panel including an ELVSS layer; a touch sensor disposed on the ELVSS layer of the display panel; and a sensing unit electrically connected with the touch sensor to sense a touch position of an object to be touched.