Patent ID: 7095466

Claim:
A method of fabricating a diffusively reflective polarizer comprising the step of: a. forming a substantially homogenous mixture of the first polymeric liquid crystal and the second polymeric liquid crystal at a sufficiently high temperature, b. applying the mixture onto at least one substrate with a predetermined surface condition to form a layer with a predetermined thickness while maintaining the mixture at mesomorphic phase, c. forming a film with a specula narrow band Bragg reflection, d. cooling the film to the room temperature at a predetermined speed, c. maintaining a sufficiently low temperature for a controllable duration to let the first polymeric liquid crystal and the second polymeric liquid crystal partially separated into a plurality of discrete microchips, wherein the microchips having a plurality of reflection wavelengths are dispersed at least two dimensionally in the cholesteric film as a result of the thermo phase separation of the polymeric liquid crystals; whereby a broadband diffusively reflective polarizer is formed.