Liquid Crystal Display Panel Single Photo-Alignment Film
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Solution Overview
Problem
The existing methods for manufacturing liquid crystal display panels require multiple alignment processes, increasing production costs and reducing manufacturing capacity due to the need for alignment films on both substrates, which complicates the photo-alignment processing and raises concerns about the size and cost of the photo-alignment processing device.
Innovation Solution
A method where only one of the alignment films on the substrates is subjected to the alignment process, reducing the number of alignment steps while maintaining sufficient transmittance, by using a photo-alignment film on either the first or second substrate to form domains with different alignment vectors, thereby simplifying the photo-alignment processing and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If both alignment films on the first substrate and second substrate are subjected to alignment process, then the liquid crystal molecules can be aligned in desired azimuthal directions, but the number of alignment processes increases and production capacity decreases
Solution Approach 1:
The invention extracts the alignment function from both substrates and concentrates it into a single alignment film on the second substrate. By removing the alignment film from the first substrate and relying solely on the alignment film on the second substrate to control liquid crystal orientation, the number of alignment processes is reduced from two to one, thereby improving production capacity while maintaining alignment precision through optimized single-film design
Solution Approach 2:
The alignment film on the second substrate is designed to perform multiple functions: it not only aligns the liquid crystal molecules in the desired azimuthal directions to achieve viewing angle improvement, but also replaces the alignment function previously performed by the alignment film on the first substrate. This multi-functional design allows a single alignment process to achieve what previously required two separate processes
2Productivity
If multiple photo-irradiation mechanisms are increased to perform alignment processes simultaneously, then production capacity can be improved, but the size and cost of photo-alignment processing device increases
Solution Approach 1:
The invention removes the need for photo-irradiation mechanisms on the first substrate by eliminating the alignment film from that substrate. Since only the alignment film on the second substrate requires photo-alignment processing, the manufacturing system needs only a single photo-irradiation mechanism instead of multiple mechanisms, thereby reducing device size and complexity while maintaining improved production capacity
3Manufacturing precision
If alignment films are provided on both substrates, then liquid crystal molecules can be aligned in different azimuthal directions, but manufacturing cost increases due to complex photo-alignment processing
Solution Approach 1:
The invention extracts and eliminates the alignment film from the first substrate, retaining only the alignment film on the second substrate. This reduction in the number of alignment films simplifies the manufacturing process and reduces the associated costs of materials and processing, while the remaining alignment film is designed to provide sufficient azimuthal alignment control for achieving different viewing angle characteristics
Solution Approach 2:
The invention changes the parameter of alignment film quantity from two to one, and optimizes the properties of the single alignment film on the second substrate to compensate for the removed alignment function. By adjusting the photo-alignment processing parameters and alignment film material characteristics, the single film achieves the necessary azimuthal control, thereby reducing manufacturing cost while maintaining alignment precision
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 allows for the production of liquid crystal display panels with sufficient transmittance using fewer alignment processes, enhancing manufacturing efficiency and reducing production costs by simplifying the photo-alignment process and equipment requirements.
Implementation Method 1
any one of the first vertical alignment film and the second vertical alignment film is a photo-alignment film subjected to alignment process such that a plurality of domains, the alignment vectors of which differ from each other, are formed
Data Source
AI summary
In the liquid crystal display panel, when no voltage is applied to a liquid crystal layer, a first tilt angle of liquid crystal molecules adjacent to a first vertical alignment film with respect to the first vertical alignment film and a second tilt angle of liquid crystal molecules adjacent to a second vertical alignment film with respect to the second vertical alignment film differ from each other. Any one of the first vertical alignment film and the second vertical alignment film is a photo-alignment film subjected to alignment process such that a plurality of domains, the alignment vectors of which differ from each other, are formed in a region of a display unit. The display unit includes the plurality of domains along a first direction of the display unit in a plan view, when a voltage is applied to the liquid crystal layer.