An electro-optical display includes a light source and a Polarization Separation Element (“PSE”) coupled to the light source. The PSE generates a first output having a first polarization state and a second output having a second polarization state. The display further includes a Hetero Polar Light...http://www.google.es/patents/US7379130?utm_source=gb-gplus-sharePatente US7379130 - LCD with hetero polar light guide
