Micro LED Wavelength Conversion Structure for Light Mixing Isolation
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Solution Overview
Problem
In high-resolution micro light emitting diode display panels for head-mounted displays, the mixture of light from adjacent micro light emitting diode elements is difficult to prevent without a separate partition, due to the high integration of these elements.
Innovation Solution
A display device structure that includes a substrate with a pixel electrode, a light emitting element extending in the substrate's thickness direction, a common electrode, a wavelength conversion layer with wavelength conversion particles, and a selective transmission film that reflects unconverted light and transmits converted light, thereby reducing light mixing without a separate partition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a partition is located between micro light emitting diode elements to prevent light mixing, then light mixing is reduced or prevented, but the width of the partition must be reduced due to high integration, making it difficult to fabricate
Solution Approach 1:
The harmful function of the partition (preventing light mixing) is extracted from its traditional form (physical barrier between LEDs) and transferred to the wavelength conversion layer and selective transmission film. The wavelength conversion layer converts light from adjacent LEDs into different wavelengths, while the selective transmission film transmits only specific wavelengths, effectively preventing light mixing without requiring a physical partition structure.
Solution Approach 2:
The solution changes the wavelength parameter of light through the wavelength conversion layer. By converting light from adjacent micro LEDs into different wavelengths and using a selective transmission film that transmits only specific wavelengths, the system prevents light mixing by altering the optical parameters rather than relying on physical separation.
2Quantity of substance
If the partition width is reduced to accommodate high integration of micro light emitting diode elements, then integration density is improved, but fabrication difficulty increases
Solution Approach 1:
The partition function is extracted and replaced by wavelength conversion and selective transmission mechanisms. This eliminates the need for precise fabrication of narrow partitions while maintaining high integration density, as the wavelength conversion layer and selective transmission film can be applied over the entire LED array without requiring sub-micron precision positioning.
Solution Approach 2:
The wavelength conversion layer and selective transmission film serve multiple functions simultaneously: they convert wavelengths, filter light, and prevent light mixing across all adjacent LED elements. This universal approach replaces the need for individualized partition structures for each LED, simplifying manufacturing while maintaining high integration.
3Device complexity
If no partition is used between adjacent light emitting diode elements, then device complexity is reduced, but light mixing occurs
Solution Approach 1:
The wavelength conversion layer and selective transmission film act as intermediary elements between adjacent LEDs. Instead of using physical partitions, these intermediary layers convert and filter light wavelengths to prevent mixing, maintaining device simplicity while effectively solving the light mixing problem.
Solution Approach 2:
The solution prevents light mixing by changing the wavelength parameter of light through conversion and selective transmission, rather than using physical barriers. This parameter-based approach reduces device complexity while maintaining optical isolation between adjacent LEDs.
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 proposed solution effectively reduces or prevents light mixing from adjacent light emitting diode elements, enhancing the display's clarity and efficiency without the need for a separate partition.
Implementation Method 1
a wavelength conversion layer on the light emitting element, including wavelength conversion particles for converting first light emitted from the light emitting element into second light
Implementation Method 2
a selective transmission film on an upper surface and on sides of the wavelength conversion layer, and configured to reflect the first light, and to transmit the second light
Data Source
AI summary
There is provided a display device comprising a substrate, a pixel electrode on the substrate, a light emitting element on the pixel electrode, and extending in a thickness direction of the substrate, a common electrode on the light emitting element, a wavelength conversion layer on the common electrode, including wavelength conversion particles for converting first light emitted from the light emitting element into second light, and a selective transmission film on an upper surface and on sides of the wavelength conversion layer, and configured to reflect the first light, and to transmit the second light.