Flexible Substrate Patterning via UV-Selective Adhesion Release
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Solution Overview
Problem
Conventional methods for patterning flexible substrates, such as evaporation, laser patterning, and reactive ion etching, face issues like pattern diffusion, contamination, low throughput, and decreased fabrication yield due to poor mask adaptation and high process temperatures.
Innovation Solution
A method involving a UV lighting process with UV blocking mask patterns to locally change the adhesion force between a release layer and a flexible substrate, allowing precise separation and preventing pattern diffusion, while maintaining high throughput and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If evaporation process with mask is used to pattern release layer, then various independent release layer patterns can be directly formed, but patterns may diffuse and connect to each other due to poor mask adaptation with carrier
Solution Approach 1:
The patent introduces a UV-blocking mask as an intermediary layer between the release layer and the carrier. This mask selectively blocks UV light in specific patterned areas, preventing the release layer from bonding to the carrier in those regions. The UV-blocking mask resolves the contradiction by enabling precise pattern definition without direct contact between the mask and carrier, thus avoiding pattern diffusion while maintaining manufacturing simplicity.
2Manufacturing precision
If laser patterning process is used, then release layer patterns can be prevented from diffusing and connecting, but fabrication yield suffers from contamination due to particles generated by laser bombardment
Solution Approach 1:
The patent replaces the mechanical/laser bombardment process with a photochemical process. Instead of using laser energy to physically remove or pattern the release layer, the invention uses UV light to selectively activate or deactivate adhesion properties of the release layer through a photoresponsive mechanism. This substitution eliminates particle generation and contamination while maintaining precise pattern separation.
3Manufacturing precision
If photolithography process is used, then release layer patterns can be prevented from diffusing and connecting, but throughput is reduced due to low fabrication speed
Solution Approach 1:
The patent extracts and eliminates the time-consuming steps of conventional photolithography (such as multiple coating, exposure, and development steps). The invention uses a simplified approach where a UV-blocking mask is applied and UV light is selectively applied to create patterns directly, removing unnecessary process steps and significantly improving throughput while maintaining pattern separation precision.
4Productivity
If RIE process is used to pattern release layer, then contamination problem is prevented and throughput is improved, but fabrication yield decreases due to need for photolithography process and higher process temperature
Solution Approach 1:
The patent changes the fundamental parameter of the patterning mechanism from plasma-based physical/chemical etching (RIE) to light-based adhesion control. By using UV light to control adhesion rather than plasma to remove material, the invention eliminates the need for high temperatures and complex photolithography processes, thereby improving fabrication yield while maintaining high throughput and preventing contamination.
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 effectively prevents release layer pattern diffusion and connection, ensuring independent flexible substrates with improved fabrication yield and high throughput, and allows for precise control over pattern positions.
Implementation Method 1
A UV lighting process is performed to expose the flexible substrate film and the release layer not covered by the UV blocking mask patterns, to a UV light
Data Source
AI summary
The invention provides a method for patterning a flexible substrate. The method for patterning a flexible substrate includes providing a carrier substrate. A release layer is formed on the carrier substrate. A flexible substrate film is formed on the release layer. A plurality of UV blocking mask patterns is formed covering various portions of the flexible substrate film and the release layer. A UV lighting process is performed to expose the flexible substrate film and the release layer not covered by the UV blocking mask patterns, to a UV light. A debonding step is performed so that the various portions of the flexible substrate film directly above the various portions of the release layer, which were not exposed to the UV light, are separated from the carrier substrate.