Light Coupling Material for Multi-Layer Display Photon Loss
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Solution Overview
Problem
Existing video display technologies face challenges in minimizing photon loss as display size increases, light output improves, and light quality is optimized, particularly due to material interfaces that cause photon loss.
Innovation Solution
The implementation of a display structure that includes an array of blue light emitting elements, a quantum dot light converting material, and a light coupling material, with the quantum dot material disposed between the blue light emitting elements and the light coupling material, to minimize photon losses at material interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple material layers are used to improve light quality and output, then light output and quality are improved, but photon loss at material interfaces increases
Solution Approach 1:
A light coupling material is introduced as an intermediary layer between the quantum dot light converting material and the top layer. This light coupling material has a refractive index that is intermediate between the quantum dot material and the top layer, creating a gradient that reduces optical impedance mismatch and minimizes photon loss at the interface while maintaining high light output and quality.
2Area of stationary object
If display size is increased to meet demand, then display area is improved, but quality and function suffer
Solution Approach 1:
The patent optimizes the refractive index parameter of the light coupling material to create an intermediate value between the quantum dot material and the top layer. This parameter change enables effective light coupling across larger display areas while maintaining image quality and functionality, allowing scaling without quality degradation.
3Illumination intensity
If light output is increased to get more photons from each pixel, then brightness is improved, but quality of emitted light deteriorates
Solution Approach 1:
The light coupling material acts as an intermediary that optimizes light extraction efficiency from the quantum dot layer. By providing an intermediate refractive index, it enables higher light output while maintaining power efficiency, as the material facilitates effective photon coupling without requiring excessive energy input.
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 reduces photon loss by optimizing light coupling across material interfaces, enhancing light output while maintaining high light quality and power efficiency.
Implementation Method 1
a quantum dot light converting material disposed in a portion of the pixel structure between the array of blue light emitting elements and the light coupling material
Implementation Method 2
a light coupling material formed over the array of blue light emitting elements... effectively reduces photon loss by optimizing light coupling across material interfaces
Data Source
AI summary
A display device that uses one or more light coupling layers is described herein, along with methods of making such devices. One device includes an array of blue light emitting elements formed on a substrate, a light coupling material formed over the array of blue light emitting elements, and a quantum dot light converting material disposed in a portion of a pixel structure formed over the array of blue light emitting elements. The light coupling material has a high refractive index and may be, or include, a polymer material.