By Kohki Takatoh
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Extra resources for Alignment technologies and applications of liquid crystal devices
The gap between the roller and the stage is adjusted to change the pile impression. Rubbing cloth Rotation speed: n Roller diameter: 2r Glass substrate Stage Moving speed: ν Contact length: l Fig. 21 Definition of the parameters associated with rubbing. Reproduction by permission from . length. The utility of this equation was confirmed by demonstration that the effects of cylinder rotation speed and number of times a substrate is rubbed are independent of the anchoring strength of a ferroelectric LC as shown in Fig.
As shown here, a uniform alignment is obtained by choosing an alignment material whose alignment characteristics show small dependences on the processing conditions. Rubbing Technologies: Mechanisms and Applications 45 Fig. 36 Tilt angle effect on applied voltage^transmittance (V^T) curve: calculated V^T curves for 2 , 4 , and 6 pretilt angles. 9 Gap offset from balance point [mm] Fig. ^A, Â^B polyimide): rubbing strength represents the offset height from the standard position. 3. Limited viewing angle caused by unidirectional alignment The electro-optical characteristics of a single domain TN LC display have a strong viewing angle dependency, because the director of the LC rotates in the same plane over the entire area of each pixel.
150 (b) (c) (d) Fig. 15 Incident angle dependence of the peak intensity for (a) BPDA-C8 and (b) BPDA-C7 polyimides. Model structures of (c) BPDA-C8 (trans-transoid) and (d) BPDA-C7 (trans-cisoid). Reproduction by permission from . 6 23 Infrared (IR) absorption measurements Although a transmittance IR absorption spectrum measurement evaluates the bulk of the alignment material, the distribution of the alignment of the molecules can be determined by a qualitative analysis by changing the polar and azimuthal angles of the sample.
Alignment technologies and applications of liquid crystal devices by Kohki Takatoh