Flexible Color Filter Substrate Separation via Release Layer
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Solution Overview
Problem
Conventional methods for manufacturing flexible color filter substrates using laser lift-off processes cause the polyimide layer to yellow, reducing the transmittance and optical performance of the substrate.
Innovation Solution
A method involving a rigid substrate with a release layer between the rigid and flexible substrate layers, allowing for separation without laser irradiation, using materials like styrene, maleic anhydride copolymer, or silicone, and cutting with laser technology to form a flexible color filter substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser lift-off process is used to separate rigid substrate with polyimide layer, then separation is achieved, but polyimide layer becomes yellow and transmittance is reduced
Solution Approach 1:
A release layer is introduced as an intermediary between the rigid substrate and the flexible substrate layer. This release layer enables separation without requiring laser irradiation of the flexible substrate layer, thus preventing yellowing while maintaining effective separation. The release layer acts as a mediator that facilitates the separation process through alternative means.
Solution Approach 2:
The separation function is extracted from the flexible substrate layer itself and transferred to the release layer. Instead of directly separating the flexible substrate layer from the rigid substrate using laser, the release layer is designed to be the layer that is removed or separated, thereby protecting the flexible substrate layer from harmful laser exposure.
2Reliability
If flexible substrate layer is irradiated by laser light for separation, then separation is achieved, but optical performance is degraded
Solution Approach 1:
The release layer serves as a mediator that absorbs the separation function, preventing laser light from directly irradiating the flexible substrate layer. This intermediary approach maintains high transmittance by keeping the flexible substrate layer free from laser-induced degradation.
3Adaptability or versatility
If polyimide layer is used as flexible substrate, then flexibility is achieved, but yellowing occurs under laser irradiation
Solution Approach 1:
The release layer acts as a protective intermediary that prevents laser light from reaching the polyimide flexible substrate layer during separation. This maintains the color stability and compositional integrity of the polyimide layer while still providing the necessary flexibility for the final product.
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 enhances the optical performance and stability of the flexible color filter substrate by avoiding laser-induced yellowing, thereby improving its optical properties.
Implementation Method 1
a method for cutting the rigid substrate and the flexible substrate layer is laser cutting
Data Source
AI summary
A method for manufacturing flexible color filter substrate includes the following steps. First, a rigid substrate is provided. The rigid substrate has an upper surface and a lower surface opposite to the upper surface. The upper surface includes a first region and a second region located at a periphery of the first region. Next, a release layer is formed on the first region. Next, a flexible substrate layer is formed to cover the second region and the release layer. Next, a color photoresist layer is formed on a portion of the flexible substrate layer above the release layer. Next, the rigid substrate and the flexible substrate layer are cut along a border between the first region and the second region. Next, the flexible substrate layer is separated with the release layer. The method for manufacturing flexible color filter substrate can improve optical performance of the flexible color filter substrate.