Splicing Display Capping Layer Geometry for Seam Optical Defects
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Solution Overview
Problem
Display devices and splicing display devices suffer from optical defects such as shining edges, ghost images, and shadow effects due to light refraction and absorption at the seams.
Innovation Solution
The design of the display device includes a capping layer with specific thickness T and refractive index n1, where the distance D from the light-exiting region to the side surface meets the equation Tan−1(D/T) > Sin−1(1/n1), ensuring light is refracted away from the seam or absorbed by a light-absorbing material, thereby reducing optical defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the capping layer thickness and geometry are not optimized, then the device structure is simpler, but optical defects such as shining edges, ghost images, and shadow effects occur at seams
Solution Approach 1:
The patent applies parameter changes by optimizing the capping layer thickness T and the distance D from the light-emitting element to the side surface to satisfy the mathematical relationship Tan⁻¹(D/T) > Sin⁻¹(1/n1), where n1 is the refractive index. This quantitative parameter optimization controls light refraction angles to prevent shining edges and ghost images while maintaining structural simplicity
Solution Approach 2:
The patent implements local quality by creating a light-exiting region with specific optical properties in the capping layer. The capping layer is designed with differentiated regions: a light-exiting region with optimized thickness and geometry for light extraction, and side surfaces with specific angles to control light direction. This localized optimization reduces optical defects at seams without complicating the overall device structure
2Object-affected harmful factors
If the capping layer is designed to control light refraction effectively, then optical quality improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes a mathematical design criterion Tan⁻¹(D/T) > Sin⁻¹(1/n1) that provides a clear target for manufacturing. By defining the relationship between distance D, thickness T, and refractive index n1, the patent converts complex optical control into a quantifiable manufacturing specification, making it easier to achieve precise light refraction control without excessive manufacturing difficulty
Solution Approach 2:
The patent applies preliminary action by pre-calculating and specifying the optimal relationship between geometric parameters (D and T) and material properties (n1) before manufacturing. The design criterion Tan⁻¹(D/T) > Sin⁻¹(1/n1) is established in advance, allowing manufacturers to directly fabricate components that meet optical performance requirements without requiring iterative adjustments or post-processing
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
This configuration effectively minimizes shining edges, ghost images, and shadow effects at the seams by optimizing light distribution and absorption, enhancing display quality.
Implementation Method 1
A distance from the light-exiting region to a 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 n1. D, T, and n1 meet the following equation: Tan−1(D/T)>Sin−1(1/n1).
Data Source
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 n1. 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.