Wavelength-Conversion Display Layout for Quantum Efficiency and Color Purity
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Solution Overview
Problem
Existing display devices face challenges in improving the internal quantum efficiency of light-emitting elements, especially at low current densities, and in preventing color mixture due to light permeation between emission areas.
Innovation Solution
The display device incorporates a substrate with first, second, and third light-emitting elements, each comprising specific semiconductor layers, and includes a wavelength conversion member in an opening formed in the semiconductor layers of the third light-emitting element to convert the emitted light. Additionally, a light-shielding member is used to prevent color mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wavelength conversion layer is used to convert light from micro light-emitting diode elements, then various colors can be displayed, but internal quantum efficiency deteriorates at low current densities
Solution Approach 1:
The device segments the light conversion function by providing separate openings for different light-emitting elements (blue, green, red) in the wavelength conversion layer. Each opening allows specific wavelength light to pass through while blocking others, enabling color display without requiring broadband wavelength conversion that would reduce quantum efficiency.
Solution Approach 2:
The wavelength conversion layer exhibits local quality variations through spatially selective light transmission. Different regions of the layer have different optical properties tailored to specific light-emitting elements beneath them, allowing each region to optimize light conversion for its local light-emitting element while maintaining overall high quantum efficiency.
2Manufacturing precision
If light-emitting elements are arranged closely to achieve high resolution, then display resolution improves, but color mixture occurs due to light permeation between emission areas
Solution Approach 1:
The device extracts and removes harmful light permeation between emission areas by implementing a light-shielding member that selectively blocks light from reaching adjacent emission areas. This extraction of the harmful effect (light leakage) allows high-resolution close spacing without color mixture.
Solution Approach 2:
A light-shielding member acts as an intermediary element between adjacent light-emitting elements. This intermediary structure prevents direct light interaction between neighboring emission areas, enabling high-resolution dense packing while eliminating color mixture through optical isolation.
3Productivity
If the wavelength conversion layer thickness is increased to improve light conversion, then color conversion efficiency improves, but light absorption by the layer increases reducing overall efficiency
Solution Approach 1:
The wavelength conversion layer is segmented into region-specific optical pathways with openings for different light-emitting elements. This segmentation allows the layer to achieve sufficient thickness for effective wavelength conversion in each region while maintaining openings that minimize overall light absorption and allow efficient light transmission.
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 enhances the internal quantum efficiency of the light-emitting elements at low current densities and improves color reproduction by preventing light permeation between emission areas.
Implementation Method 1
the wavelength conversion member is configured to convert the first light from the third light-emitting element into third light
Implementation Method 2
a light-shielding member is used to prevent color mixture
Data Source
AI summary
A display device includes a substrate, a first light-emitting element, a second light-emitting element, and a third light-emitting element on the substrate, each of the first, second, and third light-emitting elements includes a first semiconductor layer, an active layer, a second semiconductor layer, and a third semiconductor layer, an opening formed in the second semiconductor layer and the third semiconductor layer of the third light-emitting element, and a wavelength conversion member located at the opening, wherein the first light-emitting element and the third light-emitting element are configured to emit first light, and the second light-emitting element is configured to emit second light, and the wavelength conversion member is configured to convert the first light from the third light-emitting element into third light.