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Published on: October 31, 2019
Switching of polymer-stabilized vertical alignment liquid crystal cell
Chi-Yen Huang1, Wen-Yi Jhuang, Chia-Ting Hsieh
1Graduate Institute of Photonics and Department of Physics, National Changhua University of Education, Changhua, Taiwan, 500, Republic of China. chiyen@cc.ncue.edu.tw
Optics Express
|June 11, 2008
Summary
Polymer-stabilized vertical alignment liquid crystal (LC) cells show improved switching speeds. Increased monomer concentration reduces fall time, while polymer networks suppress optical bounce, significantly enhancing rise time for faster LC displays.
Area of Science:
- Materials Science
- Optoelectronics
- Display Technology
Background:
- Vertical alignment (VA) liquid crystal (LC) cells are widely used in displays.
- Switching characteristics, particularly rise and fall times, are critical for display performance.
- Optical bounce during switching can degrade visual quality.
Purpose of the Study:
- To investigate the impact of polymer stabilization on the switching characteristics of VA LC cells.
- To understand how polymer network formation affects LC molecule relaxation and defect dynamics.
- To evaluate the effectiveness of a step-voltage driving scheme in conjunction with polymer stabilization.
Main Methods:
- Fabrication and characterization of polymer-stabilized VA LC cells with varying monomer concentrations.
- Measurement of switching parameters, including rise time and fall time.
- Analysis of optical bounce in time-dependent transmittance curves.
- Implementation and testing of a step-voltage driving scheme.
Main Results:
- Increased monomer concentration led to a decrease in the fall time of the VA LC cell.
- Vertically-aligned polymer networks accelerated LC molecule relaxation.
- Polymer networks suppressed the growth and annihilation of LC defects, reducing optical bounce.
- The step-voltage driving scheme eliminated optical bounce and further improved rise time.
- Polymer-stabilized VA LC cells with the step-voltage scheme achieved rise times less than 50% of conventional driving.
Conclusions:
- Polymer stabilization effectively enhances the switching speed of VA LC cells.
- The combination of polymer networks and a step-voltage driving scheme offers a significant improvement in display performance.
- This approach holds promise for developing faster and higher-quality liquid crystal displays.
