Touch Sensing Unit Low Reflection Layer Reduces Side Reflectivity
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Solution Overview
Problem
Display devices face issues with reddish color appearance and high side reflectivity, which affect their visual quality and user experience.
Innovation Solution
A touch sensing unit is designed with a specific structure including a substrate, light emitting element, thin film encapsulation layer, touch sensor layer, low reflection layer, and passivation layer, where the touch metal layer has a unique conductive layer configuration and the low reflection layer is made of amorphous silicon and silicon carbonite, reducing side reflectivity by minimizing light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional touch sensor structure is used, then the display device can function normally, but side reflectivity is high causing reddish color appearance
Solution Approach 1:
The touch sensor layer is segmented into multiple functional sub-layers: touch insulating layer, touch metal layer (with first and second conductive layers), low reflection layer, and passivation layer. Each sub-layer performs a specific function to collectively reduce side reflectivity while maintaining touch sensing capability.
Solution Approach 2:
The low reflection layer is positioned specifically between the light emitting element and the touch metal layer, creating a localized anti-reflection zone. This layer has specific optical properties (low reflectivity) that are applied only where needed to prevent reddish color appearance from side angles.
2Ease of manufacture
If the touch metal layer is simplified, then manufacturing is easier, but light scattering increases causing reddish appearance
Solution Approach 1:
The touch metal layer is constructed as a composite structure with a first conductive layer (e.g., ITO) and a second conductive layer (e.g., Mo, Al, or Ag). This composite structure maintains electrical conductivity while controlling optical properties to reduce light scattering and prevent reddish appearance.
3Device complexity
If no low reflection layer is used, then device structure is simpler, but side reflectivity causes reddish color from external angles
Solution Approach 1:
The low reflection layer acts as an intermediary between the light emitting element and the touch metal layer. This intermediate layer specifically addresses the reddish color appearance problem by reducing side reflectivity, while the rest of the device structure remains relatively simple.
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 side reflectivity, particularly at wavelengths causing a reddish appearance, thereby enhancing the visual quality and reducing the likelihood of the display device being perceived as reddish from external angles.
Implementation Method 1
the low reflection layer is made of amorphous silicon and silicon carbonite, reducing side reflectivity by minimizing light scattering
Data Source
AI summary
A touch sensing unit having a substrate including an emission area and a non-emission area, a light emitting element positioned on the substrate and overlapping the emission area, a thin film encapsulation layer on the light emitting element and a touch sensor layer positioned on the thin film encapsulation layer, including a touch insulating layer on the thin film encapsulation layer, a touch metal layer on the touch insulating layer, and a touch protection layer on the touch metal layer, including a first conductive layer on the touch insulating layer, a second conductive layer on the first conductive layer and a first inclined surface connecting the first surface to the second surface and a third conductive layer covering the first inclined surface and the second surface of the second conductive layer.