Mesh Touch Screen Electrode Design for Signal Stability

Solution Overview

Problem

Existing touch screen panels experience weakened touch signals due to interference from the metallic touch layer, particularly in OLED display panels where the conventional diamond pattern electrode design hampers signal stability.

Innovation Solution

A touch screen panel design featuring a substrate with pixels, a bridge layer, an insulating layer, and an electrode layer shaped in a mesh structure with strip-shaped first and second induction electrodes, where the electrodes are connected through bridge units to enhance touch signal intensity without overlapping with pixels, using materials like aluminum, copper, or graphene.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a mesh-like metallic touch layer is used to realize touch function, then touch signal stability is improved, but pixel display is affected due to shading

Engineering Contradiction:

Improvetouch signal stabilityVSAvoidpixel display brightness

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The touch electrode is segmented into a mesh-like structure with reduced line width, dividing the continuous metallic layer into discrete conductive paths that minimize visual interference while maintaining electrical connectivity for touch signal detection

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The touch electrode pattern transitions from conventional diamond shape to a mesh-like structure with optimized dimensional proportions, adjusting the geometric parameters to reduce shading effect while preserving touch functionality across the display surface

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Illumination intensity

If the line width of mesh-like metal is reduced to avoid shading pixels, then pixel display is improved, but touch signal stability deteriorates

Engineering Contradiction:

Improvepixel display brightnessVSAvoidtouch signal stability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The touch electrode is segmented into a mesh-like structure with reduced line width, dividing the continuous metallic layer into discrete conductive paths that minimize visual interference while maintaining electrical connectivity for touch signal detection

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs ITO (indium tin oxide) as the touch electrode material, which provides both electrical conductivity and optical transparency, enabling the electrode to maintain functionality while reducing visual interference through optimized material properties

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If a conventional diamond pattern electrode layer is used, then manufacturing is simplified, but touch signals are weakened due to cathode interference

Engineering Contradiction:

Improveelectrode fabrication simplicityVSAvoidtouch signal intensity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The touch electrode pattern transitions from conventional diamond shape to a mesh-like structure with optimized dimensional proportions, adjusting the geometric parameters to reduce shading effect while preserving touch functionality across the display surface

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent employs ITO (indium tin oxide) as the touch electrode material, which provides both electrical conductivity and optical transparency, enabling the electrode to maintain functionality while reducing visual interference through optimized material properties

Inventive Principle:

Principle #40Composite materials

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

The design increases the capacitance area between induction electrodes, thereby improving the intensity and reliability of touch signals while maintaining the stability and durability of the touch screen panel.

Implementation Method 1

the adjacent first induction electrode units are electrically connected by the bridge layer

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

an insulating layer disposed above the bridge layer

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 3

the electrode layer is shaped in a mesh that is not overlapped with the pixels... the position of long sides of the first induction electrode units corresponds to the position of long sides of the second induction electrode

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS20210223917A1Touch screen panel

Publication Date: 2021.07.22 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

A touch screen panel is provided and includes an electrode layer. The electrode layer includes a first induction electrode and a second induction electrode. The first induction electrode includes a plurality of first induction electrode units. The adjacent first induction electrode units are electrically connected by the bridge layer. Both the first induction electrode units and the second induction electrode are strip-shaped. The position of long sides of the first induction electrode units corresponds to the position of long sides of the second induction electrode.