Micro LED Light Emitting Array With Dual Anisotropic Diffusion Layers
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Solution Overview
Problem
Displays with micro light emitting diodes (micro LEDs) face challenges in maintaining optimal light distribution and relative luminance, particularly when using anisotropic optical films designed for liquid crystal displays, which can deteriorate display properties if applied without modification.
Innovation Solution
A display device configuration featuring a substrate with pixels, light emitting elements, and layered anisotropic diffusion layers, where the first and second anisotropic diffusion layers have distinct refractive index regions and angles, optimizing light scattering to enhance relative luminance in the normal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an anisotropic optical film designed for liquid crystal displays is used for LED displays, then light distribution control is achieved, but display property deteriorates
Solution Approach 1:
The patent applies local quality by creating anisotropic diffusion layers with spatially varying refractive indices. The first anisotropic diffusion layer has a gradient refractive index in the thickness direction, while the second layer has a gradient in the horizontal direction. This local variation in optical properties enables precise control of light distribution without compromising display quality, resolving the contradiction between achieving desired luminance and maintaining display property.
Solution Approach 2:
The patent employs composite materials by combining multiple anisotropic diffusion layers with different orientations and refractive index profiles. The first layer with vertical gradient and the second layer with horizontal gradient work together as a composite optical system, achieving superior light distribution control and display performance compared to single-layer films designed for liquid crystal displays.
2Illumination intensity
If light emitting elements are mounted on array substrate, then display functionality is achieved, but light distribution in normal direction is insufficient
Solution Approach 1:
The patent applies dimensionality change by introducing gradient refractive indices in both thickness direction (first layer) and horizontal direction (second layer). This two-dimensional gradient structure enables precise control of light extraction and distribution in the normal direction, significantly improving relative luminance while maintaining ease of operation through systematic optical design.
3Ease of manufacture
If single anisotropic diffusion layer is used, then manufacturing is simplified, but light diffusion control is insufficient
Solution Approach 1:
The patent applies segmentation by dividing the optical control function into two separate anisotropic diffusion layers. The first layer handles vertical light distribution control through thickness-direction gradient, while the second layer handles horizontal distribution through horizontal-direction gradient. This segmentation enables precise light diffusion control that cannot be achieved with a single layer, while maintaining manufacturing feasibility through modular construction.
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 directs light emission towards the normal direction, improving relative luminance and maintaining display quality by combining the light diffusion functions of the anisotropic diffusion layers, thereby addressing the limitations of existing technologies.
Implementation Method 1
a first anisotropic diffusion layer facing the substrate with the light emitting elements interposed between the first anisotropic diffusion layer and the substrate; and a second anisotropic diffusion layer
Implementation Method 2
each include a region in an in-plane direction including a high refractive index region and a low refractive index region in a mixed manner
Data Source
AI summary
A light emitting element array is provided and includes substrate; light emitting elements arrayed to substrate; first anisotropic diffusion layer facing substrate with light emitting elements interposed between first anisotropic diffusion layer and substrate; and second anisotropic diffusion layer, wherein first anisotropic diffusion layer and second anisotropic diffusion layer are layered, first anisotropic diffusion layer and second anisotropic diffusion layer each include a region in an in-plane direction including a high refractive index region and a low refractive index region in a mixed manner, and absolute value of first angle formed by boundary between high refractive index region and low refractive index region of first anisotropic diffusion layer and direction perpendicular to substrate is different from absolute value of second angle formed by boundary between high refractive index region and low refractive index region of second anisotropic diffusion layer and direction perpendicular to substrate.