Liquid crystal panel substrate having alignment film and method for forming alignment film by varied evaporation angle
View Patent ↗A substrate for a liquid crystal panel having an alignment film, wherein an evaporated film is formed as the alignment film on the substrate, and wherein a portion of the evaporated film corresponding to each single pixel is split into a plurality of segments, and the evaporated film is formed with a different evaporation angle on each of the segments. The evaporation angle θ which is different for each of the plurality of segments is set within a range of 80°≦θ≦88° with respect to the layer normal to the substrate, and the plurality of split segments have approximately equal areas.
1. A liquid crystal panel comprising a liquid crystal sandwiched between a pair of substrates having electrodes deposited respectively on opposing surfaces thereof, the opposing surfaces of both of the substrates being split into a plurality of segments and an evaporated film formed on each of said segments of each substrate with a different evaporation angle and arranged as an alignment film, wherein the evaporated films are formed on the segments of both substrates in such a manner that evaporated films with the same evaporation angle face each other, a segment having a smaller evaporation angle of the evaporated film having a higher threshold voltage than a segment having a larger evaporation angle of the evaporated film and wherein the substrates are each provided with a driving voltage from a semiconductor circuit and an evaporated film having a smaller evaporation angle than the others is formed on a segment of each substrate located farther from the semiconductor circuit than the other segments on the substrate.
2. The liquid crystal panel of claim 1 , wherein the evaporation angle θ is set within a range of
80°≦θ≦88°
with respect to a layer normal to the substrate.
3. The liquid crystal panel of claim 1 , wherein the plurality of split segments have approximately equal areas.
4. The liquid crystal panel of claim 1 , wherein the liquid crystal panel is a smectic liquid crystal panel having a smectic liquid crystal thereon.
5. The liquid crystal panel of claim 4 , wherein the smectic liquid crystal is a ferroelectric liquid crystal.
6. The liquid crystal panel of claim 1 , wherein the evaporated film is an Sio x film.
7. The liquid crystal panel of claim 1 , wherein the substrates are arranged facing each other in such a manner that the axes of the evaporated films formed on the segments of the substrates are oriented parallel to each other in the evaporation direction.
8. The liquid crystal panel of claim 1 , wherein the liquid crystal panel is constituted such that it performs a grayscale display by varying the magnitude of the applied voltage to each of said segments and thereby the ratio of white display state segments to black display state segments is varied.