Photo-Alignment Material Tilt Angle Control via Janossy Effect
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Solution Overview
Problem
Current photochemical processes for forming alignment films in liquid crystal displays struggle to achieve desired tilt angles, as they align perpendicular to light vibration, limiting control over the alignment film's tilt angle.
Innovation Solution
A photo-alignment material with a photo-responsive substance having a threshold light intensity response is used, allowing for the formation of alignment films or optical anisotropic bodies through a photophysical process, enabling controlled tilt angles by aligning the substance parallel to light vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a photochemical process is used to form an alignment film, then the alignment film can be formed by irradiating with light, but the alignment film aligns perpendicular to the vibration direction of light, making it impossible to obtain a desired tilt angle
Solution Approach 1:
The patent changes the fundamental parameter of the photo-response mechanism from photochemical to photophysical. By using a photophysical process instead of a photochemical process, the alignment film aligns parallel to the vibration direction of light rather than perpendicular, enabling control over the tilt angle that was previously impossible with photochemical methods.
2Ease of operation
If a photophysical process is used to control alignment, then light intensity can be used to control alignment, but the process requires high light intensity and does not respond to extremely weak light
Solution Approach 1:
The patent accepts the parameter constraint of high threshold light intensity as a trade-off for gaining control over tilt angle. By selecting a photophysical process with appropriate photo-responsive substances, the system achieves the desired alignment control capability while operating at higher light intensities that are still practically manageable.
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 precise control of the tilt angle of alignment films and optical anisotropic bodies, enhancing the flexibility and efficiency in liquid crystal display technology.
Implementation Method 1
a photophysical control method (the Janossy effect, hereinafter, referred to as a 'photophysical process') based on a mutual interaction between excitation polarization of a dye such as anthraquinone and a photoelectric field
Implementation Method 2
a photophysical control method (the Janossy effect, hereinafter, referred to as a 'photophysical process') based on a mutual interaction between excitation polarization of a dye such as anthraquinone and a photoelectric field
Data Source
AI summary
A photo-alignment material in which an alignment film can be formed parallel to a vibration direction of light and a tilt angle of the alignment film is easily controlled and a photo-alignment method using the photo-alignment material are provided. A photo-alignment material of the present invention contains a photo-responsive substance having a threshold value of responding light intensity.