Low-Reflection Display Stack for External Light Reflectance
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Solution Overview
Problem
Display devices face challenges in maintaining clear image transmission due to external light reflection, which affects display quality and requires methods to reduce reflectance.
Innovation Solution
A display device design incorporating a substrate with emitting areas and a light blocking area, featuring a color conversion layer, anti-reflection layer, and a low reflection layer composed of multiple inorganic layers with varying refractive indices to minimize external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional display device structure is used, then the manufacturing process is simple, but the reflectance from external light is high which reduces display quality
Solution Approach 1:
The low reflection layer is divided into multiple sub-layers (first low reflection sub-layer, second low reflection sub-layer, third low reflection sub-layer) with different refractive indices. Each sub-layer has a specific thickness range (50-150 nm, 50-100 nm, and 20-50 nm respectively) to systematically reduce reflectance across different wavelengths and angles of incident light, thereby reducing overall reflectance while maintaining a manageable structural complexity
Solution Approach 2:
The patent employs a composite structure combining organic and inorganic materials with different refractive indices. The low reflection layer integrates materials with refractive indices of 1.3-1.6, 1.6-1.8, and 1.8-2.0 to create a gradient that progressively adapts to the refractive index of the underlying layers, effectively reducing reflectance through material composition rather than simple geometric modification
2Object-affected harmful factors
If a low reflection layer with multiple layers is added, then the reflectance is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes specific parameters including the thickness of each sub-layer (50-150 nm, 50-100 nm, 20-50 nm) and the refractive index range of each layer (1.3-1.6, 1.6-1.8, 1.8-2.0) to achieve effective reflectance reduction. These parameter ranges are designed to balance optical performance with manufacturing feasibility, allowing standard deposition processes to be used while achieving the desired anti-reflection effect
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 reflectance from external light, enhances display quality, simplifies manufacturing processes, and lowers production costs.
Implementation Method 1
a low reflection layer disposed on the anti-reflection layer and including a plurality of layers having different refractive indices from each other
Implementation Method 2
an anti-reflection layer covering the light blocking layer on the color conversion layer
Data Source
AI summary
A display device includes: a substrate including first, second, and third emitting areas and a light blocking area surrounding the first, second, and third emitting areas; light emitting elements disposed in the first, second, and third light emitting areas, respectively, on the substrate; a color conversion layer including a first color conversion pattern, a second color conversion pattern, and a light transmission pattern disposed in the first, second, and third emitting areas on the light emitting elements; a light blocking layer disposed in the light blocking area on the color conversion layer, an anti-reflection layer covering the light blocking layer on the color conversion layer, and a low reflection layer disposed on the anti-reflection layer and including a plurality of layers having different refractive indices from each other.