By Kohki Takatoh
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Coating Spin coating and printing are the two major methods for coating polyimide on the glass substrate. Printing is the dominant process for LCD panels, because printing can coat just the desired pattern on the substrate. Around the edges of the substrates of the LCD panels there are places for mounting driver chips and electrodes for connections which are not coated with the alignment material. The accuracy of the printing pattern is within several tens of microns. 2. Baking The baking process consists of two stages, pre-baking and hard-baking.
C) Effect of large shear deformation, similar to that which would be produced by simple elongation parallel to the substrate. (d) Modified version of large shear deformation, taking into account a possible proximity effect exerted by the substrate surface on the polymer. Reproduction by permission from American Institute of Physics . 4 Pretilt mechanisms The rubbing generates not only an azimuthal alignment, but also a polar directional alignment, called the pretilt angle, of the LC. SHG, optical retardation, and NEXAFS observations revealed that the main chains of the polymers in the alignment layer are aligned obliquely by the rubbing.
The rubbing direction corresponds to the x-direction. Reproduction by permission from . 3 from the surface normal, respectively. Before rubbing, the side chains were distributed randomly for azimuthal angles with an average polar angle of 60. 3 in the anti-rubbing direction . 4 Optical retardation measurements Measurement of the infrared (IR) absorption cannot be used to evaluate the anisotropy of the alignment layer of actual display devices because their substrates are made of glass and are not transparent to IR radiation.