In a liquid-crystal display (10), unpolarized light from a light source (12) passes through a linear polarization separation layer (14) and strikes a liquid-crystal cell (16). The liquid-crystal cell (16), in response to an applied electrical field, changes the direction of a director, so as to change...http://www.google.com.au/patents/US7405780?utm_source=gb-gplus-sharePatent US7405780 - Liquid-crystal display
