Liquid Crystal Display Manufacturing via Hydrophilized Substrates and Self-Aligning Additives
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Solution Overview
Problem
Conventional VA mode liquid crystal displays require costly polyimide alignment films for vertical alignment of liquid crystal molecules, and existing self-alignment additives fail to provide sufficient anchoring force due to surface state dependencies.
Innovation Solution
A method involving hydrophilization treatment of substrates and the use of a liquid crystal composition with an alignment aid having a polar group, which is then polymerized to ensure vertical alignment of liquid crystal molecules without the need for alignment films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyimide alignment films are used to achieve vertical alignment of liquid crystal molecules, then alignment reliability is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the polyimide alignment film from the liquid crystal display structure, replacing it with a self-aligning liquid crystal composition that contains anchoring agents. This removes the costly alignment film while maintaining vertical alignment functionality through chemical interactions between the anchoring agents and substrate surfaces.
Solution Approach 2:
The invention changes the chemical parameters of the liquid crystal composition by incorporating specific anchoring agents with polar groups that can interact with hydrophilized substrate surfaces. This parameter change enables the liquid crystal molecules to self-align vertically without requiring the polyimide alignment film, thus reducing cost while maintaining reliability.
2Ease of manufacture
If self-alignment additives are used to reduce manufacturing cost, then alignment reliability deteriorates due to insufficient anchoring force
Solution Approach 1:
The invention creates a composite system combining hydrophilized substrate surfaces with liquid crystal composition containing polar-group anchoring agents. This composite approach enhances the anchoring force between the substrate and liquid crystal molecules, ensuring reliable vertical alignment while maintaining the cost benefits of eliminating polyimide alignment films.
Solution Approach 2:
The invention introduces hydrophilization treatment as an intermediary process that modifies the substrate surface to enhance interaction with the polar-group anchoring agents in the liquid crystal composition. This intermediary treatment strengthens the anchoring force, preventing the reliability deterioration that would otherwise occur when using self-aligning additives without alignment films.
3Device complexity
If substrate surface is not treated, then manufacturing process is simplified, but anchoring force for vertical alignment is insufficient
Solution Approach 1:
The invention applies hydrophilization treatment as a preliminary surface modification step that prepares the substrate to effectively interact with the polar-group anchoring agents in the liquid crystal composition. This preliminary action ensures sufficient anchoring force for vertical alignment while keeping the overall process relatively simple, avoiding the need for complex polyimide alignment film deposition processes.
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 achieves sufficient vertical alignment of liquid crystal molecules, reducing costs and improving alignment reliability in liquid crystal display devices.
Implementation Method 1
an alignment aid having a polar group and having the function of causing the liquid crystal molecules to be aligned spontaneously
Implementation Method 2
the hydrophilization treatment is ozone treatment or UV treatment
Implementation Method 3
the hydrophilization treatment is ozone treatment or UV treatment
Implementation Method 4
the alignment aid has a polymerizable group that can be polymerized by irradiation with active energy rays
Data Source
AI summary
It is a method for manufacturing a liquid crystal display device in which an anchoring force causing liquid crystal molecules to be vertically aligned can be exerted sufficiently. A liquid crystal display device (1) including two substrates AM and CF and a liquid crystal layer (4) sandwiched therebetween can be manufactured. The liquid crystal display device manufacturing method includes: a first step of subjecting a surface of one of the substrates AM and CM that is to be in contact with the liquid crystal layer (4) to hydrophilization treatment; and a second step of disposing the two substrates AM and CF so as to face each other such that the two substrates are in contact with a liquid crystal composition containing liquid crystal molecules and an alignment aid having a polar group and having the function of causing the liquid crystal molecules to be aligned spontaneously.