Display Window Coating Stack for Low Reflection and Fingerprint Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in achieving high hardness, low reflection, and excellent durability while protecting against contamination from oil and fingerprints.
Innovation Solution
A window structure comprising a window substrate with an anti-reflection layer and an anti-fingerprint layer, where the anti-reflection layer has a stack structure of alternating sub-layers with different inorganic insulating materials and an intermediate layer with a columnar crystal structure made of silicon oxide, enhancing durability and reducing reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a coating layer is added to reduce reflectance, then visibility is improved, but the device complexity increases
Solution Approach 1:
The anti-reflection function is divided into multiple sub-layers with different refractive indices (first sub-layer with oxide, second sub-layer with different inorganic insulating material). This segmentation allows progressive reduction of reflection at each interface, achieving better visibility while maintaining manageable structural complexity through systematic layering.
Solution Approach 2:
The patent uses composite material structures combining different inorganic insulating materials with distinct refractive indices in alternating sub-layers. This composite approach enables tailored optical properties to minimize reflection across different wavelengths, improving visibility without requiring excessive layer thickness or complexity.
2Reliability
If multiple coating layers are added to protect against contamination, then durability is improved, but the device complexity increases
Solution Approach 1:
The intermediate layer with columnar crystal structure serves multiple functions simultaneously: it acts as an adhesive promoter between the anti-reflection layer and anti-fingerprint layer, provides mechanical reinforcement, and maintains optical transparency. This multi-functionality reduces the need for separate dedicated layers, improving durability while limiting complexity growth.
Solution Approach 2:
The intermediate layer functions as a mediator between the anti-reflection layer and anti-fingerprint layer, promoting strong adhesion through its columnar crystal structure. This intermediary layer prevents delamination and contamination ingress without requiring complex bonding mechanisms, thereby enhancing durability with minimal added structural complexity.
3Illumination intensity
If the anti-reflection layer uses multiple sub-layers with different materials, then reflection is reduced, but the manufacturing precision requirement increases
Solution Approach 1:
The patent optimizes specific parameters including the thickness range of the intermediate layer (1-50 nm) and first sub-layer (10-500 nm), refractive index of the intermediate layer (1.2-1.7), and density relationships between layers. These parameter specifications provide clear manufacturing targets that balance reflection reduction performance with achievable manufacturing precision, avoiding overly stringent requirements.
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 provides a window with improved hardness, reduced reflection, and enhanced resistance to fingerprints and contamination, thereby enhancing the overall performance and visibility of display devices.
Implementation Method 1
an intermediate layer between the anti-reflection layer and the anti-fingerprint layer, wherein the intermediate layer includes an inorganic insulating material having a columnar crystal structure
Implementation Method 2
an anti-reflection layer disposed on the window substrate, wherein the anti-reflection layer includes a first sub-layer including a first inorganic insulating material and a second sub-layer including a second inorganic insulating material that is different from the first inorganic insulating material
Data Source
AI summary
A window includes a window substrate, an anti-reflection layer disposed on the window substrate, an anti-fingerprint layer disposed on the anti-reflection layer, and an intermediate layer between the anti-reflection layer and the anti-fingerprint layer. The intermediate layer includes an inorganic insulating material having a columnar crystal structure.