Mesh Touch Electrode Layout for Thin Display Sensitivity

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Solution Overview

Problem

As display devices become thinner, the reduced distance between sensing electrodes and a user's fingers increases parasitic capacitance, affecting the sensitivity of touch panels.

Innovation Solution

The display device incorporates a mesh-shaped first and second sensing electrodes with specific branch and trunk configurations, including dummy electrodes and insulating layers to enhance capacitance variation and reduce overlapping areas with a user's finger.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the display device thickness is reduced, then the device becomes thinner and more compact, but the parasitic capacitance increases and sensing sensitivity deteriorates

Engineering Contradiction:

Improvedisplay device thicknessVSAvoidtouch sensing sensitivity

Core Design Contradiction:

Length of stationary objectVSMeasurement precision

Solution Approach 1:

The sensing electrodes are divided into multiple segments with trunk portions and branch portions, creating a mesh-like structure that reduces overlapping area with fingers while maintaining sensing capability. This segmentation allows the electrodes to cover more area without increasing parasitic capacitance proportionally.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sensing electrode pattern transitions from simple linear strips to two-dimensional mesh structures with trunk and branch portions extending in multiple directions. This dimensional expansion increases the effective sensing area and capacitance variation without proportionally increasing parasitic capacitance.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If the sensing electrode overlapping area with finger is increased, then the capacitance variation increases and sensitivity improves, but the parasitic capacitance increases and sensitivity deteriorates

Engineering Contradiction:

Improvetouch sensing sensitivityVSAvoidparasitic capacitance

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

Different regions of the sensing electrode have different properties - trunk portions provide structural support and connectivity, while branch portions extend into the opening areas to increase sensing capability. The mesh structure creates local variations in electrode distribution that optimize both sensing area and parasitic capacitance management.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the harmful effect of reduced thickness (increased parasitic capacitance) by designing electrode patterns that strategically reduce overlapping areas. The mesh structure with openings transforms what would be continuous parasitic capacitance into segmented capacitance, reducing the harmful effect while maintaining sensing performance.

Inventive Principle:

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

3Measurement precision

If the sensing electrode pattern complexity is increased with trunk and branch portions, then the sensing area optimization and parasitic capacitance reduction improve, but the manufacturing complexity increases

Engineering Contradiction:

Improvesensing sensitivityVSAvoidelectrode structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The trunk portions and branch portions are merged into a single integrated sensing electrode structure that can be formed in one manufacturing process. The mesh pattern combines multiple functional elements (support structures, sensing areas, connectivity paths) into a unified design that simplifies fabrication while achieving multiple performance goals.

Inventive Principle:

Principle #5Merging (Combining)

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 increases capacitance variation and improves sensitivity by optimizing the sensing area and reducing parasitic capacitance, enhancing the responsiveness of the touch panel.

Implementation Method 1

the parasitic capacitance defined between the finger and the sensing electrodes has a great influence on the sensing sensitivity

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

the reduced distance between the sensing electrodes and the user's fingers increases parasitic capacitance, affecting the sensitivity of touch panels

Methodology Applied

Scientific EffectParasitic capacitance: Parasitic Capacitance

Data Source

PatentUS20260059964A1Display device

Publication Date: 2026.02.26 SAMSUNG DISPLAY CO LTD

AI summary

A display device including a first sensor part that includes a first trunk portion, a first branch portion connected to the first trunk portion and extending in a direction different from a first direction and a second direction, a second branch portion spaced apart from the first branch portion, and a bridge connecting the first branch portion to the second branch portion. A second sensor part includes a second trunk portion extending in the second direction, and a third branch portion disposed between the first branch portion and the second branch portion.