A reflective guest-host liquid crystal display device includes an optical reflective layer and a quarter wavelength plate (1/4 wavelength phase shifter) inside the device provides improved contrast an brightness of the display with a paper-white tone....http://www.google.se/patents/US6061111?utm_source=gb-gplus-sharePatent US6061111 - Reflective LCD having orientation film formed on quarter wavelayer and planarizing film formed on reflector layer
