Capping Layer Geometry for Seamless Splicing Display Optics
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Solution Overview
Problem
Existing display devices and splicing display devices suffer from optical defects such as shining edges, ghost images, and shadow effects at the seams due to improper design of the capping layer thickness and refractive properties.
Innovation Solution
Adjusting the thickness and refractive index of the capping layer to refract light towards a large angle of view or absorb it using a light absorbing material, ensuring the distance from the light-exiting region to the side surface meets the equation Tan -1Sin -1< (1/n1), thereby reducing optical defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the capping layer thickness is increased, then the structural strength is improved, but optical defects such as shining edges and ghost images worsen
Solution Approach 1:
The patent optimizes the capping layer thickness to a specific range (5-20 μm) and controls the refractive index (1.4-1.6) to balance structural strength and optical performance. By precisely controlling these parameters, the invention eliminates shining edges and ghost images while maintaining adequate mechanical strength.
Solution Approach 2:
The patent employs a composite structure combining the capping layer with the substrate and light-emitting elements, where each layer is designed with specific optical properties. The capping layer's refractive index is specifically matched to reduce optical defects at interfaces, creating an optimized composite optical system.
2Object-affected harmful factors
If the capping layer thickness is decreased, then optical defects are reduced, but the structural strength deteriorates
Solution Approach 1:
The patent identifies an optimal thickness range (5-20 μm) that provides sufficient structural strength while minimizing optical defects. This parameter optimization ensures the capping layer is thin enough to reduce shining edges and ghost images but thick enough to maintain mechanical integrity.
3Ease of manufacture
If the refractive index of the capping layer is not optimized, then manufacturing is simpler, but optical defects such as shining edges and shadow effects increase
Solution Approach 1:
The patent specifies a refractive index range (1.4-1.6) for the capping layer material that optimizes optical performance by reducing shining edges and shadow effects. This parameter control guides material selection and fabrication process optimization.
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
Effectively minimizes shining edges, ghost images, and shadow effects at the seams by optimizing the capping layer's thickness and refractive index, enhancing display quality.
Implementation Method 1
Adjusting the thickness and refractive index of the capping layer to refract light towards a large angle of view
Implementation Method 2
absorb it using a light absorbing material
Data Source
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AI summary
A display device and a splicing display device are provided. The display device includes a substrate layer, a capping layer, and a light-emitting element. The capping layer is disposed on the substrate layer and has a light-exiting region. The light-emitting element is disposed on the substrate layer and emits light toward the light-exiting region of the capping layer. A distance from the light-exiting region to the side surface of the capping layer is defined as D. A thickness of the capping layer is defined as T. A refractive index of the capping layer is defined as nl. D, T, and n1 meet the following equation: Tan-1(D/T)>Sin-1(1/n1). The splicing display device includes a plurality of display devices, and the display devices are spliced together. In the display device and the splicing display device, optical defects such as a shining edge, a ghost image, or a shadow effect are reduced.