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Polar anchoring energy measurement of vertically aligned liquid-crystal cells
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10.1063/1.1942630
/content/aip/journal/jap/98/1/10.1063/1.1942630
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/1/10.1063/1.1942630
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic drawing of the LC director distribution of a VA cell. Left: and right: . The LC directors near the substrate surfaces could be reoriented when and the reorientation depends on the anchoring energy .

Image of FIG. 2.
FIG. 2.

Numerical simulation for the voltage-dependent , which validates the assumption of when . The LC mixture used for simulation is Merck MLC-6608: , , , , , , and .

Image of FIG. 3.
FIG. 3.

Experimental setup for measuring the anchoring energy of VA cells. A VA cell is placed between crossed polarizer and analyzer. The optical axis of the VA cell is oriented at 45° with respect to the polarizer.

Image of FIG. 4.
FIG. 4.

Voltage-dependent curve of a VA cell filled with MLC-6608. In the high-voltage region, a linear curve is observed and the intercept at is .

Image of FIG. 5.
FIG. 5.

Illustration of the intercept extrapolation method described in Eq. (6). A linear fitting is obtained in the region. The intercept at leads to . A VA cell filled with MLC-6608 is used as an example.

Image of FIG. 6.
FIG. 6.

Illustration of the slope fitting method according to Eq. (7). A linear fitting between and is observed, and the anchoring energy is deduced as . A VA cell filled with MLC-6608 is tested as an example.

Image of FIG. 7.
FIG. 7.

Illustration of the slope fitting method according to Eq. (10). A linear fitting and a measurement result of are obtained for the MLC-6608 VA cell. The LC cell capacitance measurement is avoided by adopting Eq. (8).

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/content/aip/journal/jap/98/1/10.1063/1.1942630
2005-07-07
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Polar anchoring energy measurement of vertically aligned liquid-crystal cells
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/1/10.1063/1.1942630
10.1063/1.1942630
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