Display Device Peripheral Touch Detection Electrode Configuration

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Solution Overview

Problem

Existing touch detection systems for display devices struggle to effectively detect touch inputs on the peripheral regions, as the detection electrodes in the display region may not be capable of performing reliable touch detection in these areas.

Innovation Solution

A display device configuration that includes a substrate with first electrodes in a matrix within the display region and second electrodes in the peripheral region. A driver supplies drive signals to both sets of electrodes, allowing for detection signals to be generated based on self-capacitance changes in both the first and second electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If detection electrodes are provided only in the display region, then the device complexity is reduced, but the touch detection capability in the peripheral region deteriorates

Engineering Contradiction:

Improveelectrode configurationVSAvoidtouch detection capability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The touch detection system is segmented into two distinct electrode configurations: first electrodes arranged in a matrix within the display region for self-capacitance detection, and second electrodes arranged in the peripheral region for mutual capacitance detection. This segmentation allows each region to use the most appropriate detection method, improving overall reliability while maintaining manageable complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different detection methods are applied to different regions based on their specific requirements. The display region uses self-capacitance detection with first electrodes, while the peripheral region uses mutual capacitance detection with second electrodes. This local optimization ensures high detection reliability in both regions without requiring a uniform complex configuration throughout.

Inventive Principle:

Principle #3Local quality

2Reliability

If second electrodes are added in the peripheral region, then the touch detection capability in the peripheral region is improved, but the device complexity increases

Engineering Contradiction:

Improveperipheral region touch detectionVSAvoidelectrode configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The first electrodes in the display region serve dual purposes: they function as detection electrodes for self-capacitance detection and as one set of electrodes for mutual capacitance detection when the second electrodes are activated. This multi-functionality reduces the need for completely separate electrode systems, thereby limiting the increase in device complexity while still achieving improved peripheral detection.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If self-capacitance detection is used for first electrodes, then the detection precision in the display region is improved, but the detection capability in the peripheral region deteriorates

Engineering Contradiction:

Improvedisplay region touch detectionVSAvoidperipheral region touch detection

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system applies different detection methods to different regions based on their specific requirements. Self-capacitance detection using first electrodes is optimized for the display region where high precision is needed for accurate touch positioning. Mutual capacitance detection using second electrodes is applied to the peripheral region where this method provides better detection reliability. This local optimization resolves the contradiction between precision and reliability across different regions.

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

This configuration enables accurate touch detection in both the display region and the peripheral region, enhancing the overall touch detection performance of the display device.

Implementation Method 1

the first electrodes output detection signals corresponding to self-capacitance changes in the first electrodes, and the second electrodes output detection signals corresponding to self-capacitance changes in the second electrodes

Methodology Applied

Scientific EffectSelf-capacitance: Capacitance

Data Source

PatentUS12242681B2Display device with wires overlapping electrodes

Publication Date: 2025.03.04 MAGNOLIA WHITE CORP

AI summary

A display device includes a substrate, first electrodes, second electrodes, and a driver. The first electrodes are disposed in a matrix (row-column configuration) in a display region of the substrate. The second electrodes are disposed in a peripheral region on the outside of the display region of the substrate. The driver supplies a drive signal to the first electrodes and the second electrodes. The first electrodes output detection signals corresponding to self-capacitance changes in the first electrodes. The second electrodes output detection signals corresponding to self-capacitance changes in the second electrodes.