Touch Panel Voltage Equalization to Reduce Electrode Corrosion

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Solution Overview

Problem

Touch panel electrodes corrode due to exposure to high temperature and humidity environments, leading to reliability issues.

Innovation Solution

A display device with touch electrodes arranged in different directions and a touch panel driver that applies the same voltage to both types of electrodes in non-touch sections and adjusts voltage based on capacitance changes to reduce corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If touch panel electrodes are exposed to high temperature and humidity environments for reliability testing, then the reliability of the touch panel can be evaluated, but the corrosion rate of the touch electrodes increases

Engineering Contradiction:

Improvereliability testingVSAvoidcorrosion rate

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary anti-action by applying the same voltage to both first and second touch electrodes in the non-touch section before corrosion can occur. This voltage equalization creates a protective effect that prevents corrosion during reliability testing, allowing the touch panel to be exposed to high temperature and humidity environments without suffering from increased corrosion rates.

Inventive Principle:

Principle #9Preliminary anti-action

2Ease of operation

If different voltages are applied to first and second touch electrodes, then touch sensing functionality is achieved, but corrosion of touch electrodes occurs

Engineering Contradiction:

Improvetouch sensing functionalityVSAvoidcorrosion

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating voltage application between different regions of the touch panel. In the touch section, different voltages are applied to enable touch sensing functionality. In the non-touch section, the same voltage is applied to both first and second touch electrodes to prevent corrosion. This localized differentiation allows the system to achieve both functionality and corrosion prevention simultaneously.

Inventive Principle:

Principle #3Local quality

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

Reduces corrosion of touch electrodes by stabilizing voltage conditions, enhancing the reliability of touch panels in harsh environments.

Implementation Method 1

detecting an amount of change in capacitance between the first touch electrodes and the second touch electrodes

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS20250383734A1Display device and method for driving the same, and electronic device including display device

Publication Date: 2025.12.18 SAMSUNG DISPLAY CO LTD

AI summary

One or more embodiments provide a display device including a touch panel including first touch electrodes arranged in a first direction, and second touch electrodes arranged in a second direction crossing the first direction, and a touch panel driver configured to provide touch-driving signals to the first touch electrodes, and to receive touch-sensing signals corresponding to the touch-driving signals from the second touch electrodes, wherein the second touch electrodes and the first touch electrodes are configured to receive a same voltage in a non-touch section.