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Fundamentals of Liquid Crystal Devices
Fundamentals of Liquid Crystal Devices
Date: 13 April 2011, 18:14

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I was first exposed to liquid crystal displays in 1972 when I joined Westinghouse R&D Center as a research engineer. Later, I was assigned the task of developing a 500  500100  100 pixels TFT-LCD panel for the US Air Force. At that time, the LCD fabrication processes were very primitive. The LC alignment was an obliquely evaporated SiOx film. The cell spacing was done by mylar strips for the second minimum cell gap around 8 microns. The filling of LC was in a vacuum chamber with a hypodermic syringe holding the LC and a needle glued by Epoxy to the covering glass through a hole drilled at the corner of the monochrome ITO covering glass. The LC filling could take half a day. What giant progress the LC fabrication processes have made over the past 30 years. The sizes of the glass substrates can reach almost 4 square meters. The uniform cell gap of LC first minimum around 3–4 microns is maintained by photopatterned spacers. Using the one-drop-fill technique the LC filling can be done in just a few minutes for a 4200-diagonal panel.

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