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Chin. Phys. B, 2017, Vol. 26(8): 086102    DOI: 10.1088/1674-1056/26/8/086102

Experimental design to measure the anchoring energy on substrate surface by using the alternating-current bridge

Hui-Ming Hao(郝慧明)1, Yao-Yao Liu(刘瑶瑶)1, Ping Zhang(张平)1, Ming-Lei Cai(蔡明雷)2,3, Xiao-Yan Wang(王晓燕)2,3, Ji-Liang Zhu(朱吉亮)1, Wen-Jiang Ye(叶文江)1
1 School of Sciences, Hebei University of Technology, Tianjin 300401, China;
2 Hebei Jiya Electronics Co. Ltd., Shijiazhuang 050071, China;
3 Hebei Provincial Research Center of LCD Engineering Technology, Shijiazhuang 050071, China

The anchoring property of the substrate surface of liquid crystal cells plays an important role in display and nondisplay fields. This property directly affects the deformation of liquid crystal molecules to change the phase difference through liquid crystal cells. In this paper, a test method based on the alternating-current bridge is proposed to determine the capacitance of liquid crystal cells and thus measure the anchoring energy of the substrate surface. The anchoring energy can be obtained by comparing the capacitance-voltage curves of twisted nematic liquid crystal cells with different anchoring properties in experimental and theoretical results simulated on the basis of Frank elastic theory. Compared with the other methods to determine the anchoring energy, our proposed method requires a simple treatment of liquid crystal cells and allows easy and high-accuracy measurements, thereby expanding the test ideas on the performance parameters of liquid crystal devices.

Keywords:  anchoring energy      alternating-current bridge      capacitance of liquid crystal cell      twisted nematic  
Received:  23 March 2017      Revised:  12 May 2017      Accepted manuscript online: 
PACS:  61.30.Dk (Continuum models and theories of liquid crystal structure)  
  64.70.mj (Experimental studies of liquid crystal transitions)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 11374087 and 11504080), the Natural Science Foundation of Hebei Province, China (Grant Nos. A2014202123 and A2017202004), the Research Project of the Education Department of Hebei Province, China (Grant No. QN2014130), the Key Subject Construction Project of Hebei Provincial University, and the Undergraduate Innovation and Entrepreneurship Training Program, China (Grant No. 201610080016).

Corresponding Authors:  Wen-Jiang Ye     E-mail:
About author:  0.1088/1674-1056/26/8/

Cite this article: 

Hui-Ming Hao(郝慧明), Yao-Yao Liu(刘瑶瑶), Ping Zhang(张平), Ming-Lei Cai(蔡明雷), Xiao-Yan Wang(王晓燕), Ji-Liang Zhu(朱吉亮), Wen-Jiang Ye(叶文江) Experimental design to measure the anchoring energy on substrate surface by using the alternating-current bridge 2017 Chin. Phys. B 26 086102

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