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Published on: September 20, 2017
Intermediate pre-tilt angle control by a composite alignment thin film structure for liquid crystal displays
1Institute of Electro-Optical Engineering, Department of Electronic Engineering, Chang Gung University, Kweisan, Taoyuan, Taiwan, Republic of China. wu@mail.cgu.edu.tw
Nanotechnology
|March 9, 2010
Summary
We developed a novel composite alignment film for liquid crystal displays (LCDs) using polyimide and liquid crystal polymer pillars. This structure significantly enhances the pre-tilt angle, improving display response times and reducing power consumption.
Area of Science:
- Materials Science
- Optoelectronics
- Polymer Science
Background:
- Traditional liquid crystal display (LCD) alignment layers face limitations in controlling pre-tilt angles.
- Achieving precise control over liquid crystal alignment is crucial for optimizing display performance.
Purpose of the Study:
- To design and characterize a patterned composite alignment thin film structure.
- To investigate the effect of liquid crystal polymer (LCP) concentration on the pre-tilt angle and electro-optical properties of LCDs.
Main Methods:
- Fabrication of a composite alignment film using a horizontal alignment polyimide (PI) layer and vertical alignment LCP pillars via photolithography.
- Variation of LCP precursor concentration (0-10%).
- Assembly of single-sided and double-sided LCD cells for electro-optical characterization.
Main Results:
- The pre-tilt angle increased from 7 degrees (PI only) to 24 degrees (5% LCP) and 61 degrees (10% LCP).
- Fast field-on (2.79 ms) and field-off (0.35 ms) response times were achieved in double-sided cells with 5.5 V ramping voltage.
- Promising results for electrical response time and gray level variation were observed.
Conclusions:
- The patterned composite alignment film effectively controls the cell pre-tilt angle.
- This technology holds potential for significantly improving display power consumption and response times in LCDs.
