Dual Quantum Dot Light Control Layers for Display Efficiency
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Solution Overview
Problem
Existing display devices face challenges in achieving high light efficiency, particularly in converting light across different wavelength ranges effectively.
Innovation Solution
The implementation of a display device with a second light control layer that overlaps and enhances the light conversion efficiency of a first light control layer, specifically using quantum dots to convert blue light into green and red light, thereby increasing overall light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single light control layer with quantum dots is used to convert blue light into green and red light, then color conversion is achieved, but the light conversion efficiency is insufficient and color mixing occurs
Solution Approach 1:
The single light control layer is divided into two separate layers: a first light control layer with quantum dots for converting blue light to green light, and a second light control layer with quantum dots for converting blue light to red light. This segmentation prevents color mixing between green and red emissions while maximizing light conversion efficiency for each wavelength range.
Solution Approach 2:
Each light control layer is designed with specific local properties: the first layer contains quantum dots optimized for green light emission (500-570nm), while the second layer contains quantum dots optimized for red light emission (625-750nm). This local quality differentiation ensures that each layer performs its specific color conversion function with high efficiency without interfering with the other layer's performance.
2Use of energy by moving object
If quantum dots are used to convert blue light into different colors, then color image generation is enabled, but light efficiency remains insufficient
Solution Approach 1:
The manufacturing process is segmented into two independent quantum dot layer formation processes. Each layer can be manufactured separately using established quantum dot deposition techniques, allowing for optimized individual layer production while achieving high overall light efficiency when the layers are stacked.
Solution Approach 2:
The solution transitions from a planar single-layer structure to a three-dimensional stacked structure with two distinct quantum dot layers. This dimensional change allows both layers to function simultaneously without spatial interference, maximizing light efficiency while maintaining compatibility with existing manufacturing processes.
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 significantly enhances light conversion efficiency, leading to improved overall light efficiency and reduced color mixing in display devices.
Implementation Method 1
a first light control layer comprising: a first transmission part configured to transmit the first light; a first light conversion part configured to convert the first light into a second light; and a second light conversion part configured to convert the first light into a third light
Implementation Method 2
a second light control layer overlapping at least a portion of the first light conversion part in a plan view, the second light control layer being configured to convert the first light into the second light
Data Source
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AI summary
A display device includes a base substrate, a plurality of display elements, a first light control layer, and a second light control layer. The base substrate includes a pixel region and a peripheral region adjacent to the pixel region. The display elements are disposed on the base substrate, overlap the pixel region in a plan view, and are configured to generate a first light. The first light control layer is disposed on the display elements, and includes a transmission part configured to transmit the first light, a first light conversion part configured to convert the first light into a second light, and a second light conversion part configured to convert the first light into a third light. The second light control layer overlaps at least a portion of the first light conversion part in the plan view and is configured to convert the first light into the second light.