11/24/2023 0 Comments Privacy filter![]() In the second mode, the viewing angle can be increased so that the information can be viewed at larger oblique angles. In the first mode, the viewing angle can be limited to restrict viewing to near-normal orientations. The disclosure generally relates to optical elements such as switchable privacy filters useful for displaying information in at least two modes. Paul, Minn., under the trade designation “3M™ Filters for Notebook Computers and LCD Monitors”. Such LCFs are commercially available from 3M Company, St. LCFs can be prepared by molding and ultraviolet radiation curing a polymerizable resin on a polycarbonate substrate. This can provide privacy to a viewer by blocking observation by others that are outside a typical range of viewing angles. As the viewing angle increases, the amount of light transmitted through the LCF decreases until a viewing cutoff angle is reached where substantially all the light is blocked by the light-absorbing material and the image is no longer viewable. At normal incidence, (that is 0 degree viewing angle) where a viewer is looking at an image through the LCF in a direction that is perpendicular to the film surface, the image is viewable. LCFs can be placed proximate a display surface, image surface, or other surface to be viewed. Various LCFs are known, and typically include a light transmissive film having a plurality of parallel grooves wherein the grooves are formed of a light-absorbing material. A privacy filter such as a light control film (LCF) or a light collimating film is an optical film that is configured to regulate the transmission of light.
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