Flexible Display Buffer Layer Laser Detachment
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Solution Overview
Problem
The manufacturing of flexible display devices using a glass or quartz substrate is limited by the need for high temperatures, which degrades the performance of thin film transistors and requires additional processes for adhesive removal, and existing methods struggle to efficiently detach flexible substrates without damaging display elements.
Innovation Solution
A method involving the formation of a transparent buffer layer with an optical bandgap of 3.0 eV to 4.0 eV, such as zinc oxide or stannic oxide, on a base substrate, followed by coating a high molecular weight polymer to create a flexible substrate, and using laser ablation to detach the flexible substrate without adhesive materials, allowing for the use of existing manufacturing apparatuses designed for glass or quartz substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive material is used to attach flexible substrate to base substrate, then flexible substrate can be manufactured using standard equipment, but thin film transistor performance is degraded due to high temperature and additional adhesive removal process is required
Solution Approach 1:
A buffer layer is introduced as an intermediary between the flexible substrate and base substrate. This buffer layer enables the flexible substrate to be attached to and detached from the base substrate without requiring adhesive materials, allowing standard manufacturing equipment to be used while avoiding high temperature exposure that would degrade thin film transistor performance
Solution Approach 2:
The adhesive material is completely removed from the system and replaced with a buffer layer mechanism. The buffer layer is detached along with the flexible substrate, eliminating the need for separate adhesive removal processes and preventing thermal damage to sensitive components
2Ease of operation
If adhesive material is used to attach flexible substrate, then flexible substrate can be handled during manufacturing, but additional process is required to remove adhesive material completely
Solution Approach 1:
The buffer layer combines multiple functions: it provides attachment capability during manufacturing, enables easy detachment, and eliminates the need for separate adhesive removal processes. This merging of functions reduces overall process complexity while maintaining ease of operation
3Manufacturing precision
If high temperature process is used for thin film transistor formation, then thin film transistor can be formed, but flexible substrate cannot be used due to temperature limitation
Solution Approach 1:
Display elements are formed on the flexible substrate while it is attached to the base substrate via the buffer layer. This preliminary attachment enables subsequent high temperature processing without directly exposing the flexible substrate to high temperatures, as the base substrate serves as a thermal barrier
Solution Approach 2:
The buffer layer acts as a thermal mediator that protects the flexible substrate from high temperature exposure during thin film transistor formation, enabling both high quality transistor fabrication and substrate flexibility to be maintained
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
This approach enables the formation of flexible display devices without degrading thin film transistor performance, eliminates the need for additional adhesive removal processes, and improves production efficiency by allowing the use of standard manufacturing equipment, while preventing damage to display elements and reducing thermal stress.
Implementation Method 1
irradiating a laser to the buffer layer to detach the flexible substrate from the base substrate
Data Source
AI summary
A method of manufacturing a flexible display device includes forming a buffer layer on a base substrate, wherein the buffer layer is transparent and has a optical bandgap of about 3.0 eV to about 4.0 eV; forming a flexible substrate on the buffer layer; forming display elements on the flexible substrate; and irradiating a laser to the buffer layer to detach the flexible substrate from the base substrate.