Planarization Layer Forming via Dual-Temperature Actinic Exposure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Ink-jet Adaptive Planarization (IAP) processes face challenges in achieving a planarization layer with minimal elevational differences across the surface while maintaining acceptable throughput, due to thickness changes and non-uniform topography caused by photocuring and baking processes.
Innovation Solution
A method involving exposing a photocurable composition to a first actinic radiation at a first temperature, followed by exposing it to a second actinic radiation at a second temperature, greater than ambient temperature, to form a cured planarization layer. This process includes dispensing the photocurable composition onto a substrate, removing the superstrate after the first exposure, and baking the cured planarization layer to reduce thermal shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the photocurable composition is photocured at room temperature and then baked to form a planarization layer, then the curing process is simple and materials are readily available, but the baked planarization layer exhibits non-uniform topography with elevational differences and excessive thermal shrinkage
Solution Approach 1:
The patent applies parameter changes by conducting the photocuring process at elevated temperatures (e.g., 60°C to 200°C) rather than at room temperature. This temperature parameter modification reduces the thermal shrinkage that occurs during subsequent baking, thereby minimizing elevational differences and improving planarization uniformity while maintaining process simplicity
Solution Approach 2:
The patent implements preliminary action by performing the photocuring step at elevated temperature before the baking process. This preliminary thermal treatment pre-shrinks the cured layer, so that when baking occurs afterward, the additional shrinkage is minimal, resulting in a planarization layer with reduced elevational variations
2Reliability
If the photocurable composition is exposed to actinic radiation for complete curing, then the planarization layer is fully cured, but the processing time increases significantly reducing throughput
Solution Approach 1:
The patent changes the temperature parameter during photocuring to accelerate the curing reaction kinetics. By conducting photocuring at elevated temperatures, the composition cures more rapidly and completely, reducing the required exposure time and increasing throughput while ensuring adequate curing
Solution Approach 2:
The patent employs periodic or sequential action by using multiple actinic radiation sources with different wavelengths in sequence, or by combining thermal energy with actinic radiation in stages. This approach achieves complete curing through cumulative energy input rather than requiring excessively long exposure to a single source, thereby improving throughput
3Productivity
If high energy actinic radiation is used to reduce curing time, then the throughput increases, but the radiation may cause decomposition or adverse effects on the photocurable composition
Solution Approach 1:
The patent changes the energy parameter of the actinic radiation by using moderate-energy sources combined with elevated temperature processing. This approach achieves rapid curing through thermal acceleration of the photopolymerization reaction rather than relying on high-energy radiation alone, preventing decomposition while maintaining high throughput
Solution Approach 2:
The patent creates a composite processing approach by combining thermal energy with actinic radiation energy. This composite method uses the synergistic effect of heat and light to accelerate curing without requiring excessively high radiation energies that would damage the composition, thereby achieving fast curing with minimal harmful effects
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 achieves a planarization layer with reduced thermal shrinkage and minimal elevational differences, enhancing the planarization performance while maintaining high manufacturing volume and throughput.
Implementation Method 1
photocuring a layer of the photocurable composition by exposing the photocurable composition to actinic radiation to form a cured layer
Implementation Method 2
baking the cured planarization layer to form a baked planarization layer
Data Source
AI summary
A system can include a first radiation exposure station including a first actinic radiation source, a superstrate removal tool, a second radiation exposure station located remotely with respect to the first radiation exposure station, and a controller. The second radiation exposure station can include a second actinic radiation source and a heating means for heating a photocurable composition. The controller can be configured to activate the superstrate removal tool to remove the superstrate after a first radiation exposure within the first radiation exposure station and before a second radiation exposure within the second radiation exposure station, and control the heating means to heat the photocurable composition to the radiation exposure temperature. The system can perform a method that includes radiation exposure at a first temperature and radiation exposure at a second temperature that is greater than an ambient temperature and different from the first temperature.