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

Chinese Physics B 2017年第8期26卷 315-319页

作者：郝慧明刘瑶瑶张平蔡明雷王晓燕朱吉亮叶文江 School of Sciences Hebei University of TechnologyTianjin 300401China Hebei liya Electronics Co.Ltd.Shijiazhuang 050071China Hebei Provincial Research Center of LCD Engineering Technology Shijiazhuang 050071China

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.

关键词： anchoring energy alternating-current bridge capacitance of liquid crystal cell twisted nematic

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anchoring properties of substrate with a grating surface

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Chinese Physics B 2007年第2期16卷 493-498页

作者：叶文江邢红玉杨国琛 School of Sciences Hebei University of Technology Tianjin 300130 China

The anchoring properties of substrate with a grating surface are investigated analytically. The alignment of nematic liquid crystal （NLC） in a grating surface originates from two mechanisms, thus the anchoring energy consists of two parts. One originates from the interaction potential between NLC molecules and the molecules on the substrate surface, and the other stems from the increased elastic strain energy. Based on the two mechanisms, the expression of anchoring energy per unit area of a projected plane of this grating surface is deduced and called the equivalent anchoring energy formula. Both the strength and the easy direction of equivalent anchoring energy are a function of the geometrical parameters （amplitude and pitch） of a grating surface. By using this formula, the grating surface can be replaced by its projected plane and its anchoring properties can be described by the equivalent anchoring energy formula.

关键词： anchoring properties anchoring energy elastic strain energy equivalent anchoring energy formula

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