Full-Color LED Structure With Non-Overlapping Emission Layout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for achieving a full-color effect in LEDs, such as full-color epitaxy, mass transfer, combination of three colors, and color conversion, face challenges including low light emission efficiency, limited transfer yield, size effects, and degradation of organic materials.
Innovation Solution
A full-color LED structure is designed with first, second, and third-color light-emitting units disposed on a substrate, where the third-color units are positioned away from the substrate and do not overlap with the first and second color units, allowing for independent light emission and improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If full-color epitaxy is used to achieve a full-color effect, then the device can directly obtain three-color light-emitting diodes, but the light emission efficiency is low
Solution Approach 1:
The patent divides the full-color LED into separate first-color, second-color, and third-color light-emitting units that are independently fabricated and then integrated. This segmentation allows each unit to be optimized for its specific wavelength, avoiding the efficiency losses inherent in full-color epitaxy while maintaining direct fabrication capabilities.
Solution Approach 2:
The patent introduces a transfer substrate as an intermediary element in the manufacturing process. The light-emitting units are first fabricated on this intermediate substrate, then transferred to the final substrate. This intermediary approach enables separate fabrication of high-efficiency units while achieving integrated full-color performance.
2Reliability
If mass transfer method is used to manufacture single-color light-emitting diodes separately and then transfer, then color purity is maintained, but the transfer efficiency is low and transfer yield is limited
Solution Approach 1:
The patent combines multiple light-emitting units of different colors on a single transfer substrate before transferring them together. This merging approach maintains color purity through separate unit fabrication while significantly improving transfer efficiency and yield by reducing the number of separate transfer operations required.
3Adaptability or versatility
If combination of lights of three colors is used, then a full-color effect is achieved, but the red-light device has a size effect and relatively low light emission efficiency
Solution Approach 1:
The patent applies local quality by allowing each light-emitting unit to have its own optimized structure and material composition suited to its specific wavelength requirements. The red, green, and blue units can each be independently designed for maximum efficiency at their respective wavelengths, eliminating the size effect and efficiency losses associated with combining separate devices.
4Ease of manufacture
If color conversion manner is used, then a full-color effect is achieved, but the organic material in the photoresist is prone to aging and may cause a decrease in light emission efficiency due to wavelength conversion
Solution Approach 1:
The patent extracts and eliminates the problematic organic photoresist material from the system by using inorganic light-emitting units that directly emit their respective colors. This removal of the aging-prone organic material maintains full-color display capability while significantly improving long-term reliability and stability.
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 achieves a high color brightness, enables a full-color display, and enhances light emission efficiency by ensuring that lights from different color units do not overlap and are less shielded.
Implementation Method 1
first-color light-emitting units, second-color light-emitting units, and third-color light-emitting units... light emitted by the first-color light-emitting units, light emitted by the second-color light-emitting units, and light emitted by the third-color light-emitting units
Data Source
AI summary
Provided are a full-color LED structure and a preparation method of a full-color LED structure. The full-color LED structure includes a first substrate, first-color light-emitting units, second-color light-emitting units, and third-color light-emitting units. The first-color light-emitting units and the second-color light-emitting units are disposed on a side of the first substrate, disposed in the same layer, and simultaneously prepared. The third-color light-emitting units are disposed on the side of the first-color light-emitting units and the second-color light-emitting units facing away from the first substrate, where a vertical projection of a third-color light-emitting unit on the first substrate does not overlap a vertical projection of a first-color light-emitting unit on the first substrate or a vertical projection of a second-color light-emitting unit on the first substrate.