Mesh Electrode Touch Panel Reducing Resistance

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Solution Overview

Problem

Existing touch control display panels have poor touch sensitivity due to high self-resistance of traditional touch control electrodes made of indium tin oxide (ITO), which affects the accuracy and responsiveness of touch input detection.

Innovation Solution

The implementation of a touch control display panel with a mesh electrode structure, where at least one touch control electrode array includes mesh electrodes with grid line widths of ≤5 μm, reducing the conductor area and resistance, and improving sensitivity while maintaining touch accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional ITO electrodes are used, then the structure is simple and easy to manufacture, but the self-resistance is large and touch sensitivity is poor

Engineering Contradiction:
Improvetouch sensitivityVSAvoidelectrode structure complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The electrode is divided into a mesh structure with multiple grid lines forming intersecting patterns. This segmentation reduces the resistance by creating multiple parallel conduction paths while maintaining the overall electrode function. The mesh structure consists of first and second grid lines that intersect to form multiple small electrode segments that work together to improve touch sensitivity.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The electrode transitions from a traditional planar continuous structure to a three-dimensional mesh structure with vertical and horizontal grid lines intersecting at multiple levels. This dimensional change allows for reduced resistance in both x and y directions while maintaining optical transparency and touch detection capability across the entire electrode area.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Measurement precision

If ITO electrodes are used, then the manufacturing process is simple, but the resistance is high affecting touch accuracy

Engineering Contradiction:
Improvetouch accuracyVSAvoidelectrode fabrication difficulty
Core Design Contradiction:
Measurement precisionVSEase of manufacture

Solution Approach 1:

The continuous ITO electrode is segmented into a mesh pattern with intersecting grid lines. This segmentation creates multiple conduction pathways that reduce overall resistance and improve touch accuracy by providing more uniform electrical fields across the touch surface, while the segmentation can be achieved through standard photolithography processes.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The electrode design changes the geometric parameters by introducing grid line width, grid spacing, and mesh density as controllable variables. By optimizing these parameters, the resistance can be reduced to achieve better touch accuracy while maintaining compatibility with existing manufacturing processes and material deposition techniques.

Inventive Principle:
Principle #35Parameter changes

3Reliability

If mesh electrode with small grid line width is used, then resistance is reduced and sensitivity improved, but manufacturing precision requirements increase

Engineering Contradiction:
Improvetouch sensitivityVSAvoidgrid line width control
Core Design Contradiction:
ReliabilityVSManufacturing precision

Solution Approach 1:

The electrode is segmented into a mesh structure where the grid lines are divided into manageable segments that can be fabricated using standard photolithography techniques. This segmentation allows for precise control of grid line widths within existing manufacturing capabilities while achieving the desired resistance reduction through the cumulative effect of multiple intersecting grid lines.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The mesh structure acts as an intermediary between the traditional continuous electrode and the requirement for high precision. By introducing the mesh pattern with appropriate grid spacing and line widths, the design achieves low resistance and high sensitivity while the grid dimensions can be optimized to match standard manufacturing precision capabilities, serving as a bridge between performance requirements and fabrication realities.

Inventive Principle:
Principle #24Intermediary (Mediator)

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 mesh electrode design enhances touch sensitivity and optical properties, such as light transmittance and color shift, resulting in improved image performance and reduced resistance without compromising touch accuracy.

Implementation Method 1

a mesh electrode including a plurality of grids, and a grid has a grid line width of d, where d≤5 μm

Methodology Applied
Scientific EffectElectrical Resistance: Electrical Resistance

Implementation Method 2

Capacitors are formed in intersections between the touch driving electrodes in the two touch control electrode layers. When a touch driving signal is applied to the touch control electrodes and the touchscreen is pressed or tapped by the finger, a capacitance change is introduced, and an electrical current is generated accordingly.

Methodology Applied
Scientific EffectCapacitance: Capacitance

Data Source

PatentUS10185435B2Touch control display panel and display device
Publication Date: 2019.01.22 XIAMEN TIANMA MICRO ELECTRONICS
  • US10185435B2 patent drawing
  • US10185435B2 patent drawing
  • US10185435B2 patent drawing

AI summary

A touch control display panel and a display device are provided. The touch control display panel may comprise a first touch control electrode array and a second touch control electrode array. The first touch control electrode array may include a plurality of first touch control electrodes arranged in a first direction; and the second touch control electrode array may include a plurality of second touch control electrodes arranged in a second direction different from the first direction. An orthogonal projection of a second touch control electrode onto the first touch control electrode array is at least partially overlapped with a first touch control electrode. At least one second touch control electrode is a mesh electrode including a plurality of grids, and a grid has a grid line width of d, where d≤5 μm.