Optical constructions with angular light control films

1 . An optical construction comprising:

a lens film comprising an outermost structured first major surface and an opposing outermost second major surface, the structured first major surface comprising a plurality of microlenses arranged along orthogonal first and second directions; and

a light absorbing layer disposed on the second, opposite the first, major surface of the lens film and having an average thickness of greater than about 0.5 microns and an optical density of greater than about 3 for at least one visible wavelength in a visible wavelength range extending from about 420 nm to about 680 nm, the light absorbing layer defining a plurality of through physical openings therein extending between opposite third and fourth major surfaces of the light absorbing layer, at least one of the third and fourth major surfaces comprising a plurality of irregular features imparting an average mean square height Sq of greater than about 0.05 microns to the major surface, wherein at least one of the through physical openings comprises opposing first and second sidewalls, the first and second sidewalls being substantially parallel to a thickness direction of the light absorbing layer and being substantially straight in the thickness direction, wherein the first and second sidewalls have respective first and second best linear fits with respective r-squared values R1 and R2 and respective linear slope magnitudes S1 and S2, each of R1 and R2 greater than about 0.8, and S1 and S2 within 30% of each other,

wherein for each of at least some of the through physical openings in the plurality of through physical openings, the at least one of the third and fourth major surfaces that comprises the plurality of irregular features defines inner and outer concentric annular regions that are concentric with the through physical opening and have annular widths that are within about 20% of a diameter of the through physical opening with an inner diameter of the inner annular region being between about 0.1% to about 2% greater than the diameter of the through physical opening, and an inner diameter of the outer annular region being between about 0.1% to about 2% greater than an outer diameter of the inner annular region,

wherein the at least one of the third and fourth major surfaces that comprises the plurality of irregular features has average mean square heights Sq1 and Sq2 in the respective inner and outer annular region, Sq1−Sq2≤70 nm, and wherein the at least one of the third and fourth major surfaces that comprises the plurality of irregular features has arithmetical mean heights Sa1 and Sa2 in the respective inner and outer annular region, Sa1−Sa2≤50 nm.

2 . The optical construction of claim 1 , wherein an optical transmittance of the optical construction as a function of an incident angle for a substantially collimated incident light comprises a global transmittance peak greater than about 40% and a corresponding full width at half maximum (FWHM) of less than about 30 degrees.

3 . The optical construction of claim 1 , wherein the light absorbing layer comprises a plurality of light absorbing particles at a weight loading of greater than about 60%.

4 . An optical system configured to sense a presence of a finger of a user of the optical system, the optical system comprising:

the optical construction of claim 1 ;

a display configured to display an image for viewing by the user and disposed on the outermost structured first major surface side of the lens film; and

an optical sensor configured to detect light reflected by the finger of the user and disposed on the light absorbing side of the optical construction.

5 . An optical construction comprising a light absorbing layer having an average thickness of greater than about 1.5 microns, a plurality of light absorbing particles at a weight loading of greater than about 70%, and an optical density of greater than about 3 for at least one visible wavelength in a visible wavelength range extending from about 420 nm to about 680 nm, the light absorbing layer defining a plurality of through physical openings therein extending between opposite major top and bottom surfaces of the light absorbing layer, at least one of the major top and bottom surfaces comprising a plurality of irregular features imparting an average mean square height Sq of greater than about 0.05 microns and an average height Sa of greater than about 0.7 microns to the major surface, such that at least one of the through physical openings comprises opposing first and second sidewalls, the first and second sidewalls being substantially parallel to a thickness direction of the light absorbing layer and being substantially straight in the thickness direction, wherein the first and second sidewalls have having respective first and second best linear fits with respective r-squared values R1 and R2 and respective linear slope magnitudes S1 and S2, each of R1 and R2 greater than about 0.8, and each of S1 and S2 greater than about 4,

wherein for each of at least some of the through physical openings in the plurality of through physical openings, the at least one of the major top and bottom surfaces that comprises the plurality of irregular features defines inner and outer concentric annular regions that are concentric with the through physical opening and have annular widths that are within about 20% of a diameter of the through physical opening with an inner diameter of the inner annular region being between about 0.1% to about 2% greater than the diameter of the through physical opening, and an inner diameter of the outer annular region being between about 0.1% to about 2% greater than an outer diameter of the inner annular region,

wherein the at least one of the major top and bottom surfaces that comprises the plurality of irregular features has average mean square heights Sq1 and Sq2 in the respective inner and outer annular region, Sq1−Sq2≤70 nm.

6 . The optical construction of claim 5 , wherein the at least one of the major top and bottom surfaces that comprises the plurality of irregular features has arithmetical mean heights Sa1 and Sa2 in the respective inner and outer annular region, Sa1−Sa2≤50 nm.

7 . The optical system of claim 4 further comprising a light source configured to emit light, the emitted light reflected by the finger of the user, the optical sensor detecting the reflected light.