Transfer Printing Substrate with Suspended Supports for Micro-LED Yield
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Solution Overview
Problem
Micro LED display panels face issues with uneven thickness of LED particles on transfer printing substrates, leading to poor image display due to incomplete pickup of micro-components by transfer printing heads, resulting in reduced yield and uneven image brightness.
Innovation Solution
A transfer printing substrate with supporting structures having a fixing part and a suspended supporting part, where the suspended supporting part is connected to the fixing part and provides a first moving space between itself and the carrying substrate, ensuring all micro-components with varying thicknesses are successfully picked up by the transfer printing heads through electrostatic clamping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED particles are formed directly on a display substrate, then the production process is simplified, but the yield of picking up is reduced due to uneven thickness of LED particles
Solution Approach 1:
The invention separates the LED particle formation process from the display substrate by introducing a transfer printing substrate as an intermediate carrier. This segmentation allows LED particles to be formed on a dedicated substrate where thickness variations can be accommodated, then transferred to the display substrate in a controlled manner, resolving the conflict between process simplification and pickup yield.
Solution Approach 2:
The transfer printing substrate acts as an intermediary between the LED particle formation process and the display substrate. It provides a buffer that accommodates thickness variations of LED particles through its flexible supporting structures, enabling successful pickup and transfer to the display substrate, thus maintaining both process simplicity and high yield.
2Device complexity
If LED particles with varying thicknesses are placed on a rigid substrate, then the substrate structure is simple, but the pickup process fails for thinner particles resulting in poor image display
Solution Approach 1:
The invention replaces the rigid substrate with dynamic, flexible supporting structures that can deform in response to varying LED particle thicknesses. The supporting part can bend downward to accommodate thinner particles, ensuring all particles make contact with the transfer printing head for reliable pickup, thereby maintaining structural simplicity while improving image display quality.
Solution Approach 2:
The invention changes the mechanical parameter of the substrate from rigid to flexible, allowing the supporting structures to adapt their shape and position based on the thickness of individual LED particles. This parameter change enables the system to handle thickness variations without compromising pickup reliability or image quality.
3Stability of the object's composition
If the supporting structure is rigid, then the structure is stable and simple, but it cannot accommodate micro-components of different thicknesses during transfer
Solution Approach 1:
The invention introduces dynamic flexibility to the supporting structure while maintaining overall stability through the fixed part. The supporting part can deform locally to accommodate different LED particle thicknesses, providing adaptability without sacrificing the structural stability needed for reliable transfer printing.
Solution Approach 2:
The supporting structure is segmented into a fixed part and a flexible supporting part, allowing different regions to serve different functions. The fixed part provides stability and anchoring, while the supporting part provides adaptability to thickness variations, resolving the contradiction between stability and versatility.
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 ensures all micro-components are picked up, improving the yield of micro-component transfer and preventing issues of uneven image brightness by accommodating micro-components of different thicknesses and maintaining stable contact during the transfer process.
Implementation Method 1
the transfer printing heads pick up all of the micro-components and transfer them to the display substrate based on the principle of electrostatic clamping that charges of different polarities attract each other
Data Source
AI summary
Provided is a transfer printing substrate and a method for producing the same, in order to improve yield of picking up of the micro-components and further improve quality of image display. The transfer printing substrate includes a carrying substrate, a plurality of supporting structures, and a plurality of micro-components corresponding to the plurality of support structures in one-to-one correspondence, wherein each of the plurality of supporting structures includes a fixing part and a suspended supporting part, wherein an end of the fixing part is fixed on the carrying substrate, an end of the suspended supporting part is connected to the fixing part, the other end of the suspended supporting part supports a corresponding one of the plurality of micro-components, and a first moving space is provided between the suspended supporting part and the carrying substrate. The transfer printing substrate is used for transferring the micro-components.