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Controlling liquid crystal pretilt angle with photocurable prepolymer and vertically aligned substrate.

Che-Ju Hsu, Bao-Long Chen, Chi-Yen Huang

    Optics Express
    |February 3, 2016
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    This study introduces a novel method to precisely control liquid crystal (LC) pretilt angles using photocurable prepolymers. Varying prepolymer concentration allows for tunable LC cell angles, crucial for display technologies.

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    Area of Science:

    • Materials Science
    • Liquid Crystal Displays
    • Polymer Chemistry

    Background:

    • Controlling liquid crystal (LC) pretilt angles is critical for optimizing display performance.
    • Existing methods for pretilt control can be complex or limited in tunability.

    Purpose of the Study:

    • To develop a new, versatile method for controlling the pretilt angle of liquid crystals.
    • To investigate the influence of photocurable prepolymer concentration on LC pretilt angles.

    Main Methods:

    • Fabrication of LC cells with vertically aligned substrates.
    • UV-induced polymerization of photocurable prepolymer on substrate surfaces.
    • Analysis of surface polarity changes and resulting pretilt angle variations.

    Main Results:

    • Vertical phase separation of prepolymer during UV exposure led to surface polymerization.
    • Polymer structure formation altered substrate surface polarity, effectively controlling pretilt angle.
    • Achieved precise control of LC pretilt angles ranging from 87.3° to 2.5° with 0-2.5 wt% prepolymer concentration.

    Conclusions:

    • Photocurable prepolymer offers a facile and effective route to tune LC pretilt angles.
    • This technique provides a wide range of controllable pretilt angles for advanced LC device applications.
    • The method demonstrates significant potential for enhancing liquid crystal display technologies.