Patterning Alignment Layers via Selective Adhesion
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Solution Overview
Problem
Existing methods for patterning alignment layers in liquid crystal display devices are inefficient, requiring accurate mask alignment, expensive equipment, and multiple steps, which limits their suitability for low-cost, high-throughput manufacturing.
Innovation Solution
A method involving the application of an adhesion modifier to a substrate to create regions with varying adhesion properties, allowing a fixable material to be formed into a desired configuration and patterned without the need for precise mask alignment or additional removal steps, using a carrier film with a surface that selectively retains or removes the fixed material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithography with masks is used for patterning alignment layers, then pattern accuracy can be achieved, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent extracts and removes the mask alignment step from the conventional photolithography process. By using a carrier film with integrated patterned adhesion promoter, the masking function is eliminated entirely, simplifying the process while maintaining pattern accuracy through the pre-defined adhesion regions on the carrier film.
Solution Approach 2:
The carrier film serves as an intermediary element that combines the pattern definition and adhesion promotion functions. The patterned adhesion promoter on the carrier film acts as a mediator that selectively bonds the fixable material only in desired regions, eliminating the need for separate mask alignment while preserving manufacturing precision.
2Manufacturing precision
If conventional photolithography with masks is used for patterning alignment layers, then pattern accuracy can be achieved, but manufacturing cost increases due to expensive equipment
Solution Approach 1:
The carrier film is designed as a disposable element that is applied, processed, and then removed. The patterned adhesion promoter on the carrier film enables precise patterning without requiring expensive reusable mask equipment. The carrier film itself becomes a low-cost, single-use tool that delivers high precision at reduced manufacturing cost.
Solution Approach 2:
By extracting the mask function and integrating it into the carrier film, the patent eliminates the need for expensive mask alignment equipment. The pattern definition is transferred to the carrier film itself, allowing conventional, less expensive equipment to achieve the same patterning results.
3Manufacturing precision
If conventional photolithography with masks is used for patterning alignment layers, then pattern accuracy can be achieved, but productivity decreases due to multiple process steps
Solution Approach 1:
The patent merges the pattern definition, adhesion promotion, and material retention functions into a single carrier film element. The patterned adhesion promoter on the carrier film simultaneously defines the pattern and provides selective adhesion, eliminating the need for separate mask application, alignment, and material deposition steps, thereby increasing productivity while maintaining precision.
Solution Approach 2:
The patterned adhesion promoter is pre-defined on the carrier film before the fixable material is applied. This preliminary action of pre-patterning the adhesion regions eliminates the need for subsequent mask alignment and selective deposition steps, streamlining the process and improving manufacturing throughput while preserving pattern accuracy.
4Ease of manufacture
If adhesion modifier is applied to create selective adhesion regions, then ease of manufacture improves by eliminating mask alignment, but manufacturing precision must be maintained through selective adhesion control
Solution Approach 1:
The patent uses the analogy of selective bonding through adhesion control, where the patterned adhesion promoter creates regions of high and low adhesion strength. By controlling the adhesion properties spatially, the fixable material is retained only in desired regions when the carrier film is removed, achieving precise patterning through adhesion modulation rather than mechanical masking.
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 method enables efficient and cost-effective patterning of alignment layers with high accuracy and yield, reducing the complexity and expense of the manufacturing process while maintaining the quality of the patterned layer.
Implementation Method 1
applying an adhesion modifier to a substrate to create regions with varying adhesion properties
Implementation Method 2
a fixable material, such as a photopolymer or thermo-setting polymer
Data Source
AI summary
The invention relates to a method of patterning a layer formed from a fixable material such as photopolymer on a surface in a desired pattern. The method involves coating selected areas of the substrate with an adhesion promoter and subsequently coating the fixable material. The fixable material is then fixed, for instance by curing by exposure to UV radiation. The adhesion promoter is adapted to have a surface energy which is designed to adhere to the substrate or selected areas thereof and also to the fixed material such that fixed material may be easily removed from areas of the substrate not coated with adhesion promoter but retained in areas where the adhesion promoter has bonded to the substrate.