| abstract |
An optical film comprising a dispersed phase of polymer particles arranged in a continuous birefringent matrix in combination with a light directing material that allows for control of light emitted from a luminaire or display. Provided. The film is typically oriented by stretching in one or more directions. In the resulting film, the size and shape of the dispersed phase particles, the volume fraction of the dispersed phase, the thickness of the film, and the orientation such that the desired degree of diffuse reflection and total transmission of electromagnetic radiation of the desired wavelength is obtained. Choose the size of Also, the light directing material is selected to control the direction of polarized light reflected from or transmitted through the optical film. |