Touch Sensing Structure Light-Shielding Layer Bridge Reflection
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Solution Overview
Problem
Capacitive touch devices suffer from display quality deterioration due to external light reflection from high-reflectivity conductive bridges, causing perceived bright spots on the surface.
Innovation Solution
A touch sensing structure with a transparent substrate and a patterned light-shielding layer that overlaps the conductive bridge to block external light, improving display quality by mitigating reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive bridges are made of high-reflectivity metal to ensure electrical conductivity, then electrical connection is improved, but external light reflection increases causing bright spots and deteriorated display quality
Solution Approach 1:
A light-shielding layer is introduced as an intermediary component between the conductive bridge and the external environment. This layer blocks light from reaching the conductive bridge, preventing reflection while maintaining electrical connectivity. The light-shielding layer acts as a mediator that resolves the conflict between electrical function and optical performance.
Solution Approach 2:
The light-shielding layer is selectively positioned only where needed - specifically where it overlaps with the conductive bridge in the top view. This localized application ensures that light blocking occurs precisely at the problematic reflection points while minimizing impact on overall display transparency and maintaining electrical conductivity in non-overlapping areas.
2Object-affected harmful factors
If a light-shielding layer is added to block external light from reaching the conductive bridge, then display quality is improved, but device structure becomes more complex
Solution Approach 1:
The light-shielding layer is integrated with existing touch sensor components, particularly overlapping with conductive bridges and potentially combining with electrode structures. This merging approach allows the light-shielding function to be achieved without adding completely separate, independent components, thereby reducing the increase in device complexity.
Solution Approach 2:
The light-shielding layer serves multiple functions simultaneously: it blocks light to prevent reflection, maintains electrical insulation where needed, and can be integrated with electrode structures. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity.
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 solution effectively reduces bright spots caused by external light reflection, enhancing the display quality of touch display devices by strategically positioning and sizing the patterned light-shielding layer relative to the conductive bridge.
Implementation Method 1
A patterned light-shielding layer is disposed between an inner surface of a transparent substrate (cover lens) and a conductive bridge of a touch sensing electrode in a manner of at least partly overlapping the conductive bridge to block an external light passing through the transparent substrate from reaching to and then being reflected by the conductive bridge
Data Source
AI summary
A touch sensing structure including a transparent substrate and at least one touch sensing unit disposed on the transparent substrate is provided. Each touch sensing unit includes a first patterned electrode, a second patterned electrode, a conductive bridge and a patterned light-shielding layer. The second patterned electrode is isolated from the first patterned electrode and is separated into a first portion and a second portion by the first patterned electrode. A conductive bridge electrically connects the first portion and the second portion and is spatially separated from the first patterned electrode. The patterned light-shielding layer is disposed between the conductive bridge and the inner surface and at least partly overlaps the conductive bridge along a direction normal to the transparent substrate.