Low reflectivity contrast enhancement filter
Assignee3M Innovative Properties Company
InventorsPaul S. Lugg, Kenton D. Budd, John E. Bailey, Matthew H. Frey, Scott G. Theirl
Life of this patent
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Abstract
A low reflectivity, variable attenuation contrast enhancement filter having a total visible light reflectance of less than about 2.0% when measured with light incident to the first outer major surface. The contrast enhancement filter has a first layer(s) for providing antireflection, the first layer(s) defining the first outer major surface; a variable attenuation element interposed between the first major outer surface and the second major outer surface; element(s) for providing fixed attenuation interposed between the variable attenuation element and the first major outer surface; and at least one substrate.
Claims30
A low reflectivity, contrast enhancement filter having a first outer major surface and a second outer major surface, the filter comprising:
- (i) a first means for providing antireflection, the first means defining the first outer major surface;
- (ii) a variable attenuation element interposed between the first major outer surface and the second major outer surface;
- (iii) means for providing fixed attenuation interposed between the variable attenuation element and the first major outer surface;
- and
- (iv) at least one substrate;
- wherein the contrast enhancement filter has a total visible light reflectance of less than about 2.0% when measured with light incident to the first outer major surface.
A low reflectivity, contrast enhancement filter having a first outer major surface and a second outer major surface, the filter comprising:
- (i) a first means for providing antireflection, said means defining the first outer major surface;
- (ii) a variable attenuation element interposed between the first means for providing antireflection and the second major outer surface, the variable attenuation element having index-matched layers;
- and
- (iii) at least one substrate;
- wherein the contrast enhancing filter has a total visible light reflectance of less than about 2.0% when measured with light incident to the first outer major surface.
Dependencies are inferred from the claim text.