Optical filter with improved viewing angle characteristics
AssigneeAlphamicron Incorporated
InventorsTamas Kosa, Bahman Taheri
Life of this patent
Estimating the term…
Abstract
A light absorbing filter includes a chiral anisotropic liquid crystal host having a positive anisotropy and a dichroic light absorbing moiety in association with the host. The filter is characterized by an absorbance Aq for light measured at incident angle q from normal to the filter surface, that is at least 1% higher or at least 1% lower than an absorbance AT predicted by Beer's law when θ is at least 30°. The light absorbing filter may be used in association with an optical element and a light source.
Claims21
A light absorbing filter disposed in association with an optical element and a light source, the filter comprising a chiral anisotropic liquid crystal host having positive anisotropy and a dichroic light absorbing moiety in association with the host, wherein the filter is characterized by an absorbance Aθ for light measured at incident angle θ from normal to the filter surface, that is at least 1% higher or at least 1% lower than an absorbance AT predicted by Beer's law when θ is at least 30°.
12-21. (canceled)
Dependencies are inferred from the claim text.