Touch Panel Relay Patterns Reduce Resistance Deviation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Capacitive-type touch panels face issues with high surface resistance in their touch sensing electrodes, leading to decreased touch sensitivity and accuracy due to resistance differences between first and second patterns, and reduced transmittance, which affects the visibility and performance of touch screens.

Innovation Solution

The touch panel incorporates relay patterns and connection patterns with a specific structure to electrically connect separated unit patterns of the touch sensing electrodes, reducing resistance deviation and improving sensitivity and accuracy, while maintaining low visibility to minimize impact on image display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If ITO or conductive polymer is used as transparent touch sensing electrode, then transparency is maintained, but surface resistance becomes high causing decreased touch sensitivity and accuracy

Engineering Contradiction:

ImprovetransparencyVSAvoidtouch sensitivity

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The sensing electrode is divided into multiple separated unit patterns (first unit patterns and second unit patterns) arranged in different directions. These segmented patterns are connected through relay patterns and connection patterns, allowing the system to maintain transparency while reducing surface resistance effects through distributed conductivity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Relay patterns are introduced as intermediary elements between the separated unit patterns. These relay patterns act as mediators to electrically connect the first and second unit patterns, ensuring continuous signal transmission while maintaining the segmented structure's transparency benefits.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If bridge electrode is used to connect sensing patterns, then electrical connection is achieved, but transmittance is reduced affecting image visibility

Engineering Contradiction:

Improveelectrical connectionVSAvoidtransmittance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

Connection patterns are designed with optimized local properties, including specific width and material composition, to achieve electrical connection while minimizing light blockage. The connection patterns are strategically positioned to connect relay patterns and unit patterns only where necessary, preserving overall transmittance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The width and material composition of connection patterns are carefully controlled to optimize the balance between electrical conductivity and optical transmittance. By adjusting these parameters, the connection patterns achieve reliable electrical connection while minimizing impact on image visibility.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If resistance difference exists between first and second patterns, then manufacturing is simplified, but touch accuracy decreases due to uneven capacitance detection

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidtouch accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The first and second unit patterns are designed with substantially equal resistance characteristics through careful control of pattern dimensions, material composition, and arrangement. This homogeneity ensures uniform capacitance detection across the touch panel, improving touch accuracy while maintaining manufacturing simplicity through standardized fabrication processes.

Inventive Principle:

Principle #33Homogeneity

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 enhances the sensitivity and accuracy of the touch panel while reducing resistance deviation between sensing electrodes, thereby improving the overall performance and image quality of the touch screen.

Implementation Method 1

information of the touched point is detected and transferred to a driving circuit via the first patterns, second patterns and position detecting lines as a change in capacitance depending on a contact position

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS9886127B2Touch panel and image display device including the same

Publication Date: 2018.02.06 DONGWOO FINE CHEM CO LTD

AI summary

A touch panel comprises a substrate and a touch sensing electrode formed on at least one surface of the substrate. The touch sensing electrode includes a first sensing pattern formed in a first direction, a second sensing pattern formed in a second direction, a first relay pattern formed at an inside of the first sensing pattern in an island form, a second relay pattern formed between the first sensing pattern and the second sensing pattern, and a connection pattern which electrically connect separated unit patterns of the second sensing pattern via the first relay pattern and the second relay pattern. The connection pattern includes a first connection pattern which connects the first relay pattern and the second relay pattern, and a second connection pattern which connects the second relay pattern and the unit pattern of the second sensing pattern.