Anti-Reflective Display Stack for Hardness and Low Glare
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Solution Overview
Problem
Display devices face challenges in maintaining high surface hardness and impact resistance while providing clear image visibility and reducing reflectivity under external light, leading to user fatigue.
Innovation Solution
A display device design incorporating a light emitting element layer, a light control layer with quantum dots, and multiple anti-reflective members with specific refractive index layers to enhance reflectance and strength, eliminating the need for a protective layer and simplifying the stack structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective layer is added to improve surface hardness and impact resistance, then strength is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent combines the protective layer function and anti-reflective layer function into a single integrated anti-reflective member. This member includes multiple layers with different refractive indices (first anti-reflective layer with refractive index 1.3-1.6, second anti-reflective layer with refractive index 1.6-1.8, and third anti-reflective layer with refractive index 1.8-2.0) that simultaneously provide both protection against physical damage and reduction of light reflection. By merging these functions, the patent eliminates the need for a separate protective layer, thereby reducing device complexity while maintaining strength improvements.
2Object-affected harmful factors
If multiple anti-reflective layers with different refractive indices are used to improve reflectance reduction, then reflectivity is reduced, but device complexity increases
Solution Approach 1:
The patent segments the anti-reflective function into multiple distinct layers, each with a specific refractive index range (first anti-reflective layer: 1.3-1.6, second anti-reflective layer: 1.6-1.8, third anti-reflective layer: 1.8-2.0). This segmentation allows each layer to address different aspects of light reflection at various interfaces within the display structure. By dividing the anti-reflective function into specialized sub-layers, the patent achieves superior reflectance reduction (minimizing reflection to less than 1%) while organizing the complexity in a systematic and manageable way.
Solution Approach 2:
The patent employs composite material structures with progressively increasing refractive indices from the first to the third anti-reflective layer. This composite approach creates an optimized optical path that gradually transitions light between media of different refractive indices, minimizing abrupt refraction and reflection. The use of composite materials with carefully selected refractive index ranges enables the system to achieve excellent anti-reflective performance while maintaining a relatively compact and integrated structure.
3Device complexity
If the stack structure is simplified by eliminating the protective layer, then device complexity is reduced, but strength may be compromised
Solution Approach 1:
The patent designs the anti-reflective member to serve multiple functions simultaneously: it provides anti-reflective properties through its multi-layer structure with different refractive indices, and it provides protective properties through the inherent mechanical strength of these layers. The third anti-reflective layer, with the highest refractive index (1.8-2.0), is positioned to provide both optimal optical performance and enhanced mechanical protection. This multi-functional design allows the single anti-reflective member to replace both the separate protective layer and anti-reflective layers, thereby simplifying the device structure while maintaining or even improving strength characteristics.
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 design improves reflectance and strength, enhancing image clarity and reducing user fatigue by minimizing reflectivity, while reducing manufacturing costs through a simplified structure.
Implementation Method 1
The first anti-reflective member includes a first refractive layer having a first refractive index and a second refractive layer between the first refractive layer and the color filter layer and having a second refractive index smaller than the first refractive index
Implementation Method 2
a first anti-reflective member on the light control layer... The first anti-reflective member includes a first refractive layer having a first refractive index and a second refractive layer
Implementation Method 3
The second anti-reflective member includes a third refractive layer on the color filter layer and having a third refractive index, a fourth refractive layer on the third refractive layer and having a fourth refractive index equal to or smaller than the third refractive index, and a fifth refractive layer between the third refractive layer and the fourth refractive layer and having a fifth refractive index greater than each of the third refractive index and the fourth refractive index
Implementation Method 4
a second anti-reflective member on the color filter layer... The second anti-reflective member includes a third refractive layer on the color filter layer
Implementation Method 5
a light control layer on the light emitting element layer and including a quantum dot
Data Source
AI summary
A display device includes a first anti-reflective member and a second anti-reflective member. The first anti-reflective member includes a first refractive layer having a first refractive index and a second refractive layer having a second refractive index smaller than the first refractive index. The second anti-reflective member includes a third refractive layer having a third refractive index, a fourth refractive layer disposed on the third refractive layer and having a fourth refractive index equal to or smaller than the third refractive index, and a fifth refractive layer disposed between the third refractive layer and the fourth refractive layer and having a fifth refractive index greater than each of the third refractive index and the fourth refractive index. Thus, the display device has improved strength and reflectance.