Shield Wire for Touch Display Interference Mitigation

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Solution Overview

Problem

Display apparatuses with capacitive touch detection systems face interference from wires supplied with detection drive signals, which can influence the display during operation periods.

Innovation Solution

Incorporating a conductive shield that overlaps the detection wires and is supplied with a predetermined voltage during display operation periods, preventing interference by ensuring the electric field generated by the wires does not reach the display region.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If wires are arranged near the display region to supply detection drive signals, then touch detection function is enabled, but display quality deteriorates due to electric field interference

Engineering Contradiction:

Improvetouch detection functionVSAvoiddisplay interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

A shield wire is introduced as an intermediary element between the detection drive signal wire and the display region. This shield wire acts as a mediator that intercepts and redirects electric field lines, preventing them from reaching the display region and causing interference, while allowing the detection function to operate normally.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The shield wire, which could be considered an additional component increasing complexity, actually reduces overall system interference by converting the harmful electric field into a controlled phenomenon. The shield wire's electric field cancels out the interfering field from the detection wire, transforming a potential harm into a beneficial shielding effect.

Inventive Principle:

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

2Object-affected harmful factors

If shield wires are added to prevent interference, then display quality is maintained, but device complexity increases

Engineering Contradiction:

Improvedisplay interferenceVSAvoidwire configuration

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The shield wire is merged with the existing wire structure in the frame region, utilizing the same conductive material and integration methodology. This merging approach allows the shield function to be added without creating entirely separate subsystems, thereby reducing the increase in device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shield wire structure is designed to serve multiple purposes: it provides electromagnetic shielding for the display region, maintains electrical connectivity through the frame region, and can be integrated with existing gate line structures. This multi-functionality reduces the need for additional dedicated components, mitigating the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 effectively prevents the influence of detection wires on the display, maintaining clear and uninterrupted visual output during both touch detection and display operations.

Implementation Method 1

these wires could have influenced display in the display operation period

Methodology Applied

Scientific EffectElectric Field: Electric Field

Implementation Method 2

a shield that is a conductive member overlapping at least one of the first wires when viewed in a direction perpendicular to the display region and is supplied with a second signal having a predetermined second voltage in the display operation period

Methodology Applied

Scientific EffectElectrostatic Shielding: Faraday Cage

Data Source

PatentUS10310663B2Display apparatus to mitigate touch detection drive signal interference

Publication Date: 2019.06.04 MAGNOLIA WHITE CORP

AI summary

According to an aspect, a display apparatus capable of preventing influence on a display by wires supplied with detection drive signals in a self-capacitive detection operation. The display apparatus includes: a plurality of gate lines; a plurality of first wires arranged in a frame region surrounding a display region and each configured to supply a detection drive signal to the respective gate lines in a detection operation period and be supplied with a first signal having a predetermined first voltage in a display operation period different from the detection operation period; and a shield that is a conductive member overlapping at least one of the first wires when viewed in a direction perpendicular to the display region and is supplied with a second signal having a predetermined second voltage in the display operation period.