RGB Micro-LED Self-Assembly Using Differentiated Tip Geometry
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Solution Overview
Problem
The challenge in display technology is the efficient self-assembly of red, green, and blue semiconductor light-emitting elements for large-scale displays, as existing methods like pick & place have low success rates and are not suitable for large-screen applications, and self-assembly methods require complex processes and structures.
Innovation Solution
A display device design that incorporates red, green, and blue semiconductor light-emitting elements with structurally differentiated tips and receiving holes, allowing for simultaneous self-assembly by maintaining a circular cross-section and varying thickness and angle differences, enabling position selectivity and efficient assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pick & place method is used to transfer semiconductor light-emitting devices, then transfer can be performed, but success rate is low and it is not suitable for large-screen displays
Solution Approach 1:
The semiconductor light-emitting devices perform self-assembly through self-propulsion in liquid, automatically finding their positions on the substrate without external manipulation. This self-service mechanism eliminates the need for pick & place operations, achieving high transfer success rates and suitability for large-screen displays simultaneously.
2Productivity
If self-assembly method is used to assemble semiconductor light-emitting devices, then large-screen display realization is advantageous, but process complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex intermediate assembly substrate and transfer processes from the self-assembly method. By enabling direct self-assembly of semiconductor light-emitting devices onto the final display substrate, the process complexity is reduced while maintaining the advantage of large-screen display realization.
3Manufacturing precision
If red, green, and blue semiconductor light-emitting elements are assembled separately, then position selectivity can be achieved, but number of transfer processes increases
Solution Approach 1:
The patent merges the assembly processes of red, green, and blue semiconductor light-emitting elements into a single simultaneous self-assembly operation. All three types of elements are assembled together in one process step, maintaining position selectivity through their intrinsic self-propulsion characteristics while eliminating the need for multiple separate transfer processes.
Data Source
AI summary
A display device, according to the present invention, comprises a red semiconductor light-emitting element, a green semiconductor light-emitting element and a blue semiconductor light-emitting element, and comprises: a substrate on which the red, green and blue semiconductor light-emitting elements are arranged; and receiving holes which are formed on the substrate and in which the red, green and blue semiconductor light-emitting elements are assembled, wherein the red, green and blue semiconductor light-emitting elements each comprise a tip on a side surface thereof, such that at least any one among the angle formed by the tip and the thickness of one side with respect to the tip is formed so as to be different.