Micro-LED Color Conversion Layers for High-Efficiency Full-Color Displays
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Solution Overview
Problem
Existing display devices, particularly head-mounted displays, face challenges in achieving high luminous efficiency due to limitations in the color conversion process of micro light emitting diode elements, which primarily emit single-color light.
Innovation Solution
A display device is designed with a substrate featuring first and second color conversion layers made of GaN doped with erbium (Er) and europium (Eu) respectively, converting blue light into green and red wavelengths, and includes a barrier layer to protect the light emitting elements, with a simplified manufacturing process that prevents damage to the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a color conversion layer is formed using a separate manufacturing process, then color conversion functionality is achieved, but the active layer may be damaged and luminous efficiency decreases
Solution Approach 1:
The patent combines the formation of the color conversion layer with the formation of the light-emitting element structure itself. The color conversion layer is formed as part of the same manufacturing process that creates the light-emitting element, eliminating the need for a separate color conversion layer formation step. This integration prevents damage to the active layer that would occur during separate processing while maintaining color conversion functionality.
Solution Approach 2:
The color conversion layer is formed preliminarily during the light-emitting element fabrication process, before the device is completed and assembled. By incorporating the color conversion layer formation into the initial manufacturing sequence, the patent avoids subsequent handling and processing that could damage the active layer, thus preserving luminous efficiency.
2Adaptability or versatility
If multiple color conversion layers are added to achieve full-color display, then display performance improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The light-emitting element structure is designed to serve multiple functions simultaneously. The same structural components that form the light-emitting element also provide the color conversion functionality. This multi-functionality allows full-color display capability to be achieved without adding separate dedicated color conversion layers, thereby maintaining structural simplicity while enhancing display performance.
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 enhances luminous efficiency by effectively converting blue light into multiple colors, simplifies the manufacturing process, and reduces the risk of damage to the active layer, thereby improving display performance.
Implementation Method 1
a first color conversion layer on the second light emitting element, and a second color conversion layer on the third light emitting element... the first color conversion layer may convert the light of the blue wavelength band into a light of a green wavelength band and may emit the light of the green wavelength band, and the second color conversion layer may convert the light of the blue wavelength band into a light of a red wavelength band
Data Source
AI summary
A display device comprises a substrate, and a first light emitting element, a second light emitting element, and a third light emitting element provided on the substrate and each including a first semiconductor layer, an active layer, and a second semiconductor layer. A third semiconductor layer is provided on the first light emitting element, a first color conversion layer is provided on the second light emitting element, and a second color conversion layer is provided on the third light emitting element, wherein the first color conversion layer and the second color conversion layer include the same semiconductor material as the third semiconductor layer, and further include dopants different from that of the second semiconductor layer.