Patent ID: 9696482
Date: 2017-07-04
CPC Classifications: G02B,G09G

Claim:
1. A display comprising: a side entry lightguide structure having a receiving side and an output surface, the lightguide structure configured to receive light through the receiving side and output the light through the output surface; a cover screen structure configured to display an image with a first portion of the light; and a dimming film disposed between the output surface and the cover screen structure, wherein a first side of the dimming film that is positioned to receive the light output from the output surface is opposite a second side of the dimming film, wherein the second side includes a plurality of facets, each having a convex or a concave shape, the dimming film configured to selectively pass a first portion of the light out through the second side to the cover screen structure, the dimming film further to selectively redirect a second portion of the light through the first side back into the lightguide structure, wherein based on an index of refraction of the dimming film, the plurality of facets of the dimming film internally reflects the second portion twice at the second side while the second portion propagates in the dimming film, wherein the dimming film is configured to change the index of refraction in response to an application of an electrical field; wherein the cover screen structure is configured to receive the second portion from the lightguide structure after redirection of the second portion by the dimming film.