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Control of Cell Geometry through Infrared Laser Assisted Micropatterning
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Published on: July 10, 2021

Surface-controlled patterned vertical alignment mode with reactive mesogen.

You-Jin Lee1, Young-Ki Kim, Soo In Jo

  • 1Department of Information Display Engineering, Hanyang University, Seoul, Korea.

Optics Express
|June 10, 2009
PubMed
Summary

A new liquid crystal display mode uses patterned vertical alignment (PVA) with reactive mesogens for faster response times. This surface-controlled PVA (SC-PVA) method achieves rapid grey level transitions by controlling liquid crystal director alignment.

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Area of Science:

  • Materials Science
  • Physics
  • Display Technology

Background:

  • Traditional liquid crystal displays (LCDs) face limitations in response time, impacting visual experience.
  • Vertical alignment (VA) modes offer good contrast but can suffer from slow response times.
  • Achieving faster switching speeds across all grey levels is crucial for advanced display applications.

Purpose of the Study:

  • To introduce a novel patterned vertical alignment (PVA) mode for LCDs.
  • To enhance response times in liquid crystal displays using a modified surface treatment.
  • To investigate the effect of polymerized reactive mesogens on liquid crystal director alignment and switching speed.

Main Methods:

  • Developed a surface-controlled PVA (SC-PVA) mode utilizing ultraviolet (UV) curable reactive mesogen (RM) mixed with vertical alignment material.
  • Polymerized RM monomers in the alignment layer along the liquid crystal directors via UV exposure under an applied voltage.
  • Utilized a patterned electrode configuration to control the direction of the applied field and resulting RM polymerization.

Main Results:

  • The SC-PVA mode demonstrated significantly fast response times across all grey levels.
  • Polymerized RMs induced a specific pretilt angle against the substrate normal, dependent on the applied field direction.
  • The predetermined rotational preference of liquid crystal directors, governed by the pretilt direction, enabled faster switching.

Conclusions:

  • The proposed SC-PVA mode effectively achieves fast response times in LCDs.
  • Surface modification with polymerized RMs offers a viable method for controlling liquid crystal director behavior.
  • This technology holds promise for improving the performance of next-generation liquid crystal displays.