Methods and apparatus for forming dual polarized images
US11467397B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2018 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Oct 23, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3058
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Methods are described for forming polarized image films in which a displayed image changes depending on the state of polarization of a backside illumination source. Methods are also described for eliminating the leakage of unpolarized light through certain parts of the images resulting in unwanted visual artifacts in these images. Polarized dual graphic films achieving images with higher optical density and uniformity, minimum ghosting and mis-registration, can be made by a manufacturing technique that is faster, capable of higher production volumes, and that can produce polarized images at a lower cost. An exemplary method provides for forming a polarized image or pattern on an oriented substrate by using a negative patterned resist image or pattern formed by graphic arts techniques, followed by the imbibition of a dichroic dye or iodine ink to form a corresponding positive image in the areas not protected by the resist.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.