Reflective Layer Auxiliary Structure for Display Oxidation Prevention
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Solution Overview
Problem
Conventional reflective layers in display devices suffer from oxidation and hillock formation during manufacturing, leading to increased resistance and operational issues, while attempts to address these problems with additional metal layers compromise reflectance.
Innovation Solution
A display device structure incorporating a reflective layer with a first auxiliary layer that improves electrical characteristics and prevents oxidation, maintaining reflectance above 80%, and a second auxiliary layer for enhanced adhesion, using materials like aluminum, silver, and indium tin oxide, with a transparent electrode for current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflective layer is used in display devices, then light reflection is achieved, but oxidation and hillock formation occur during manufacturing leading to increased resistance
Solution Approach 1:
An auxiliary layer is introduced between the reflective layer and the electrode as an intermediary protective barrier. This auxiliary layer prevents direct contact between the reflective layer and oxidizing environments during manufacturing processes, thereby preventing oxidation and hillock formation while maintaining the reflective layer's electrical conductivity and optical properties.
Solution Approach 2:
The auxiliary layer is formed on the reflective layer before subsequent manufacturing steps are performed. This preliminary protective action ensures that the reflective layer is shielded from oxidation and hillock formation during subsequent processing, preventing electrical conductivity degradation before it occurs.
2Object-affected harmful factors
If a metal layer is introduced between the reflective layer and electrode to prevent oxidation, then oxidation is prevented, but reflectance decreases
Solution Approach 1:
The auxiliary layer is designed with specific optical parameters (reflectance not greater than 80%) and material composition (such as ITO, ZnO, or Ti) that balance protective function with optical performance. By carefully selecting materials and controlling layer thickness, the auxiliary layer prevents oxidation while maintaining overall reflectance above 80% for the reflective stack.
Solution Approach 2:
The structure employs a composite configuration combining the reflective layer (Al, Ag, or their alloys) with the auxiliary protective layer (transparent conductive oxides or metals like Ti). This composite structure integrates both protective and reflective functions, where the auxiliary layer provides oxidation protection while the reflective layer maintains high reflectance, achieving overall reflectance above 80%.
3Reliability
If the reflective layer is made more conductive, then electrical characteristics improve, but adhesion to substrate deteriorates
Solution Approach 1:
The structure is segmented into functionally distinct layers: the reflective layer (Al, Ag, or alloys) provides electrical conductivity and light reflection, while the auxiliary layer (transparent conductive oxide or Ti) provides both protection and adhesion. This segmentation allows each layer to optimize its primary function without compromising the other, as the auxiliary layer serves as both protective barrier and adhesion promoter between the reflective layer and electrode/substrate.
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 ensures a conductive reflective layer with improved electrical properties and adhesion, preventing hillock and oxidation, while maintaining high reflectance, thus providing a reliable conductive path for current and effective light reflection.
Implementation Method 1
the reflective layer reflects the light from the light emitting elements back to the viewer
Implementation Method 2
The first auxiliary layer improves the electrical characteristic of the reflective layer or prevents the resistance of the reflective layer from increasing
Implementation Method 3
the current flows from the driving element to the reflective layer of the first area, the first auxiliary layer, the transparent electrode on the first auxiliary layer
Data Source
AI summary
A display device including a substrate, a driving element, a reflective layer and a first auxiliary layer is provided. The substrate has a first area and a second area. The driving element is placed within the first area. The reflective layer is placed above the first area and at least a portion of the second area and coupled to the driving element. The first auxiliary layer is placed on the reflective layer above the first area. The first auxiliary layer improves the electrical characteristic of the reflective layer. A reflectance of the first auxiliary layer is not larger than a reflectance of the reflective layer.