A liquid crystal display device which allows a multi-gradation display to be attained by selectively applying or removing a fixed voltage to the liquid crystal, eliminating the necessity of substantially increasing the display unit area or finely adjusting the value of the voltage applied to the liquid...http://www.google.fr/patents/US5121235?utm_source=gb-gplus-shareBrevet US5121235 - Liquid crystal display device having light transmission control layer
Liquid crystal display device having light transmission control layer
