Photocurable Composition Planarization via Controlled Heating
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Solution Overview
Problem
Ink-jet Adaptive Planarization (IAP) processes face challenges in achieving uniform planarization as the thickness change of the photocurable composition during photocuring and baking leads to non-uniform topography, with existing methods struggling to maintain planarity due to significant thickness reduction and elevational differences on the surface.
Innovation Solution
A system comprising a heating means and an actinic radiation source is used to control the photocuring temperature of the photocurable composition, with a controller determining the targeted temperature for achieving a photocuring temperature higher than ambient, and a baking temperature higher than the photocuring temperature, to minimize thickness change and enhance planarization performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photocuring is performed at room temperature, then the photocurable composition can be cured, but the thickness change becomes significant leading to non-uniform topography
Solution Approach 1:
The patent applies parameter changes by modifying the photocuring temperature from room temperature to an elevated temperature range (25-100°C). This temperature parameter change reduces the thickness change during photocuring, thereby improving planarization performance and reducing elevational differences on the surface.
2Manufacturing precision
If the photocurable composition is heated to higher temperature, then thickness change is reduced, but the process complexity increases
Solution Approach 1:
The patent merges the heating function with the existing substrate handling system by integrating a heating stage or chuck that can be incorporated into standard lithography or processing equipment. This integration approach reduces device complexity by combining multiple functions (substrate holding, heating, and processing) into a single system component.
Solution Approach 2:
The system controls the photocuring temperature within a specific range (25-100°C) to optimize thickness uniformity. By maintaining temperature within this controlled range rather than using excessively high temperatures, the system achieves good planarization performance while avoiding excessive thermal stress and material degradation.
3Manufacturing precision
If photocuring temperature is increased, then planarization performance improves, but the energy consumption increases
Solution Approach 1:
The patent optimizes the photocuring temperature to a moderate range (25-100°C) rather than using high temperatures. This optimized parameter change achieves sufficient planarization performance while minimizing energy consumption for heating, as the temperature increase is limited to what is necessary to reduce thickness change during photocuring.
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 controlled temperature process reduces thickness change to within ±2.0%, resulting in a more uniform baked layer with reduced elevational differences, thereby improving planarization performance and achieving better surface flatness.
Implementation Method 1
a first heating means for heating a photocurable composition over a substrate
Implementation Method 2
exposing the photocurable composition to actinic radiation to form a cured layer
Data Source
AI summary
A system can include a heating means for heating a photocurable composition over a substrate; an actinic radiation source configured to emit actinic radiation at a wavelength less than 700 nm; and a controller configured to determine a targeted temperature to be produced by the first heating means to achieve a photocuring temperature of the photocurable composition when the photocurable composition is exposed by the actinic radiation source, wherein the photocuring temperature is greater than an ambient temperature. A method can include dispensing the photocurable composition over a substrate; photocuring a layer of the photocurable composition at a photocuring temperature higher than ambient temperature to form a cured layer; and baking the cured layer to form a baked layer. The system and method can allow a thickness change of layer to be 0% or closer to 0%.