Polymer Film Alignment Layer for LCD Panels
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Solution Overview
Problem
Current liquid crystal display panels face issues with the use of polyimide (PI) alignment films, which are prone to dust, electrostatic problems, and high costs, and have limited heat and aging resistance, affecting panel quality and increasing fabrication complexity.
Innovation Solution
A liquid crystal material comprising liquid crystal molecules, polymerizable monomers, and a vertical alignment agent is used to form a polymer film that replaces the PI alignment film, simplifying the alignment process and reducing costs, while preventing impurities from diffusing into the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubbing alignment type PI material is used, then liquid crystal alignment can be achieved, but dust particles, residual electrostatic, and brush marks occur reducing process yield
Solution Approach 1:
The patent replaces the mechanical rubbing process with a photoalignment process using optical fields. The alignment film contains photoreactive groups that undergo photoisomerization when exposed to polarized light, creating alignment patterns without mechanical contact, thereby eliminating dust and electrostatic issues associated with rubbing
Solution Approach 2:
The patent changes the alignment mechanism from mechanical friction to optical field interaction. By using photoreactive compounds that respond to light polarization parameters, the system achieves alignment through optical parameters rather than mechanical forces, resolving the harmful effects of mechanical rubbing
2Object-affected harmful factors
If optical alignment PI material is used, then rubbing problems are avoided, but material has limited heat resistance, poor aging resistance, and weaker liquid crystal anchoring ability
Solution Approach 1:
The patent employs composite alignment films combining polyimide base materials with photoreactive compounds. This composite structure maintains the thermal stability and mechanical properties of polyimide while incorporating photoisomerizable groups for optical alignment, achieving both dust-free processing and high reliability
Solution Approach 2:
The patent merges the advantages of rubbing alignment (strong anchoring, heat resistance) with optical alignment (dust-free, precise control) by combining polyimide materials with photoreactive additives in a single alignment layer,实现ing both mechanical robustness and optical precision
3Reliability
If PI material is used for alignment, then liquid crystal alignment is achieved, but high polarity and high water absorption cause deterioration resulting in uneven alignment
Solution Approach 1:
The patent modifies the chemical parameters of the alignment film by introducing hydrophobic groups and reducing polar content. This changes the material's interaction with moisture, significantly reducing water absorption while maintaining alignment functionality through photoreactive mechanisms
4Reliability
If PI alignment film is used, then liquid crystal alignment is achieved, but the process is complex and cost increases
Solution Approach 1:
The patent combines multiple functions into a single alignment layer that provides both alignment and protection functions. The photoreactive alignment film eliminates the need for separate rubbing processes and reduces the number of fabrication steps while maintaining alignment performance
Solution Approach 2:
The alignment film serves multiple functions simultaneously: it provides liquid crystal alignment through photoreactive groups, acts as a protective barrier against impurities, and eliminates the need for mechanical rubbing equipment, simplifying the overall device structure and process
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 polymer film ensures effective liquid crystal alignment, enhances panel quality, and reduces fabrication costs by eliminating the need for a separate alignment film process, while maintaining the alignment and preventing impurity diffusion.
Implementation Method 1
the polymerizable monomers and the vertical alignment agent can occur a polymerization to form a polymer, the polymer deposits on a substrate to form a polymer film
Implementation Method 2
refracting light of the backlight module to produce frames
Data Source
AI summary
The liquid crystal material of the disclosure includes liquid crystal molecules, polymerizable monomers and a vertical alignment agent, wherein the polymerizable monomers and the vertical alignment agent can be polymerized under ultraviolet irradiation to form a polymer, while the polymer deposits on a substrate to form a polymer film capable of replacing the PI alignment film; so that an alignment process of the liquid crystal is simplified, and a cost is economized. The method of fabricating the liquid crystal display panel of the disclosure eliminates the fabricating process of the alignment film.