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Liquid crystals will orient themselves based on how the material has been deposited on the glass surfaces. If the surfaces provide a 90 degree twist then the crystals, in their steady state will twist 90 degrees as well. The crystals also allow the light to propagate through so the light wave orientation can twist as well. If a liquid crystal with a 90 degree twist is put in between two polarizing filters that are oriented 90 degrees out of phase, the horizontally polarized light will to pass through the vertical filter. That is the steady state condition. When an electric field is generated using the ITO segments, the liquid crystal will align with the generated field. This changes the light waves orientation and the vertical filter now blocks the horizontally polarized light. At this point the segment has no light and appears dark. This is considered the on condition.
PTM Published on: 2011-05-13
South Korea