Gradient-Filler Transfer Substrate for Precise LED Chip Placement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies face challenges in accurately assembling large-area high-pixel displays using semiconductor light emitting elements due to arrangement errors during the transfer process, which are exacerbated by deformation of the stamp layer during transfer.
Innovation Solution
A transfer substrate is developed with an organic stamp layer containing a concentration gradient of inorganic fillers, where the concentration increases from the protrusion towards the base layer, enhancing stiffness and adhesion to minimize deformation and improve transfer precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional stamp layer is used for transferring semiconductor light emitting elements, then the transfer process can be performed, but arrangement errors occur due to deformation of the stamp layer
Solution Approach 1:
The stamp layer is constructed as a composite material comprising a polymer matrix combined with inorganic fillers (such as silica or alumina particles). This composite structure provides both the flexibility needed for transfer and the stiffness required to minimize deformation, directly resolving the contradiction between maintaining stamp layer stability and achieving precise arrangement of semiconductor elements
Solution Approach 2:
The stamp layer is designed with non-uniform properties: the region contacting the semiconductor elements has optimized filler concentration for minimal deformation, while other regions maintain appropriate flexibility. This local differentiation allows the stamp to resist deformation during transfer while remaining adaptable to the transfer substrate surface
2Manufacturing precision
If the stamp layer stiffness is increased to reduce deformation, then arrangement precision improves, but adhesion to semiconductor elements deteriorates
Solution Approach 1:
The stamp layer's mechanical parameters are precisely controlled by adjusting the concentration, size distribution, and type of inorganic fillers. By optimizing these parameters, the stamp achieves a balanced state where sufficient stiffness prevents deformation while adequate adhesion maintains contact with semiconductor elements during transfer
Solution Approach 2:
The composite nature of the stamp layer allows simultaneous optimization of conflicting properties: the polymer matrix provides adhesion and flexibility, while the inorganic filler network provides stiffness and dimensional stability, resolving the trade-off between adhesion strength and arrangement precision
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 method and substrate enhance the reliability and precision of transferring semiconductor light emitting elements, reducing arrangement errors and deformation during the transfer process, thereby improving the fabrication of large-area displays.
Implementation Method 1
precipitating a multitude of the inorganic fillers of the mixed solution by gravity in a direction of the base substrate by turning the mold and the base substrate upside down
Data Source
AI summary
Disclosed, in the present specification, is a transfer substrate for transferring a semiconductor light emitting device with high reliability and a method for manufacturing a display device by using same. Specifically, the transfer substrate includes an organic stamp layer having a protrusion, wherein the organic stamp layer contains a plurality of inorganic fillers, and the concentration of the inorganic fillers is formed so as to increase as the distance from the protrusion increases. Therefore, the protrusion of the organic stamp layer has a low concentration of the inorganic fillers so as to maintain sufficient adhesion for transferring the semiconductor light emitting device, and the stiffness of the organic stamp layer itself is formed so as to be much stronger than that of a stamp layer using a single organic material. Accordingly, it is possible to improve the accuracy of transfer by minimizing an arrangement error of the semiconductor light emitting device due to the deformation of the stamp layer occurring in a transfer process. Accordingly, it is possible to improve the accuracy of transfer by minimizing an arrangement error of the semiconductor light emitting device caused by the deformation of the stamp layer occurring during a transfer process.