Patent Publication Number: US-11640019-B2

Title: Spectrally selective retroreflective system

Description:
FIELD OF INVENTION 
     The present invention relates generally to light control films, and more specifically to spectrally selective and angular selective light control films for use in various optical applications such as optical communication systems having a light source, an optical construction, and/or detector system. 
     BACKGROUND 
     The louver structure is known in the art of privacy films in display devices or window applications applied to, for example, building, houses, etc. In the case of privacy films, when a user does not want others to see the contents of a screen of an electronic display device, the user can physically apply a privacy film to the screen such that images can be viewed selectively. Typically, images being displayed on the screen can be viewed through the privacy film only when the viewer is positioned within a range of angles referred to as “viewing angle”. Normally, the viewing angle is some range of angles centered on an axis normal to the surface of the privacy film. As the position of the viewer changes such that the viewer is positioned outside the viewing angle, images being displayed are less or no longer viewable. 
     In the case of window applications, the louver structure is typically a window blind or shutter with horizontal slats that are angled to admit background light but keep out direct sunshine. The amount of light that can go through the louver structure depends on the angle of the slats (or the louver orientation). 
     SUMMARY 
     Generally, the present invention relates to light control films. The present invention also relates to light control films that have different viewing angle for different wavelength ranges. 
     In one embodiment of the invention a light control film includes a plurality of spaced apart first regions, where each first region has a substantially low transmission in one or two of a first wavelength range from about 300 nm to about 400 nm, a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 nm to about 1200 nm, and a substantially high transmission in the remaining wavelength ranges. The light control film has a first viewing angle of less than about 70 degrees along a predetermined first direction. In some cases, the light control film has a second viewing angle of less than about 70 degrees along an orthogonal predetermined second direction different from the first viewing angle. In some cases, the light control film of claim  1  includes a major microstructured first surface having a plurality of alternating ribs and channels, where each channel is at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. In some case, the light control film also includes a plurality of second regions that alternate with the plurality of first regions. In such cases, each second region may have a substantially high transmission in each wavelength range the first regions have a substantially low transmission in. 
     In another embodiment, a light control film includes a major microstructured first surface having a plurality of alternating ribs and channels. Each channel is at least partially filled with a first material. Each channel has a width W and a height H, where H/W≥1. Each rib includes a second material, where the absorption of at least one of the first and second materials varies as a function of wavelength in a range from about 300 nm to about 1200. In some cases, the absorption of each of the first and second materials varies as a function of wavelength in a range from about 400 nm to about 1200. 
     In another embodiment, a light control film includes a plurality of spaced apart first regions and a second region. Each first region has a substantially low transmission in a first wavelength range from about 700 nm to about 1200 nm, and the second region has a substantially low transmission in a second wavelength range from about 300 nm to about 400 nm. 
     In another embodiment, a light control film includes a plurality of spaced apart first regions and a second region. Each first region has a substantially low transmission in at least one of a first wavelength range from about 300 nm to about 400 nm, a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 to about 1200 nm. The second region has a substantially low transmission in at least one of the at least one of the three wavelength ranges each first region has substantially low transmission in. In some cases, each first region and the second region have substantially low transmission in the same two of the three wavelength ranges. 
     In another embodiment, a light control film includes a plurality of spaced apart first regions and a second region. Each first region has a substantially high transmission in a first wavelength range from about 300 nm to about 400 nm and a substantially low transmission in a second wavelength range from about 400 nm to about 700 nm. The second region has a substantially high transmission in each of the first and second wavelength regions. 
     In some embodiments, a detector system includes a detector that is sensitive to wavelengths in a detection wavelength range. The detector system further includes a light control film that is disposed on the detector and includes a plurality of alternating first and second regions, where each first region has a width W and a height H, H/W≥1. Each first region has a substantially low transmission in a first portion of the detection wavelength range and a substantially high transmission in the remaining portions of the detection wavelength range. Each second region has a substantially high transmission in the detection wavelength range. In some cases, the detection wavelength range is from about 800 to about 1600 and the first portion of the detection wavelength range is from about 900 nm to about 1100 nm. 
     In some embodiments, a light control film includes a plurality of spaced apart first regions and a second region, where each first region has a width W and a height H, H/W≥1. Each first region has substantially low transmissions in each of non-overlapping predetermined first and second wavelength ranges. The second region has a substantially low transmission in the predetermined second wavelength range. In some cases, the predetermined first wavelength range includes shorter wavelengths and the predetermined second wavelength range includes longer wavelengths. 
     In some embodiments, a light control film includes a plurality of spaced apart first regions and a second region. Each first region has a width W and a height H, H/W≥1, and a substantially low transmissions in each of non-overlapping predetermined first and second wavelength ranges. The second region has substantially high transmission in the predetermined second wavelength range. 
     In some embodiments, a light control film includes a plurality of spaced apart first regions and a second region. Each first region has a width W and a height H, H/W≥1, and a substantially high transmission in a predetermined first wavelength range and a substantially low transmission in a predetermined non-overlapping second wavelength range. The second region has substantially high transmission in each of the predetermined first and second wavelength ranges. 
     In some embodiments, a light control film includes a plurality of spaced apart first regions and a second region, where each first region has a width W and a height H, H/W≥1, and a substantially low transmission in a predetermined first wavelength range and a substantially high transmission in a predetermined non-overlapping second wavelength range. Each second region has substantially low transmission in each of the predetermined first and second wavelength ranges. 
     In some embodiments, a light control film includes a plurality of spaced apart first regions and a second region. Each first region has a width W and a height H, H/W≥1, and a substantially high transmission in a predetermined first wavelength range and a substantially low transmission in a predetermined non-overlapping second wavelength range. The second region has substantially low transmission in each of the predetermined first and second wavelength ranges. 
     In some embodiments, a light control film includes a plurality of spaced apart first regions and a second region, where each first region has a width W and a height H, H/W≥1, and a substantially low transmission in a predetermined first wavelength range and a substantially high transmission in a predetermined non-overlapping second wavelength range. The second region has substantially high transmission in each of the predetermined first and second wavelength ranges. 
     In some embodiments, a light control film is configured to block light in a predetermined wavelength range and includes a plurality of spaced apart first regions. Each first region has a width W and a height H, H/W≥1, and a substantially high transmission in a predetermined first wavelength range, a substantially low transmission in a predetermined second wavelength range, and a substantially high transmission in a predetermined third wavelength range. The second wavelength range is disposed between the first and third wavelength ranges 
     In some embodiments, a light control film includes a plurality of spaced apart first regions and a second region, such that for light incident normally to a plane of the light control film an average optical transmittance of the light control film is less than about 10% in a predetermined first wavelength range having shorter wavelengths, and an average optical transmittance of the light control film is greater than about 50% in a predetermined second wavelength range having longer wavelengths. Furthermore, for light incident at or greater than about 30 degrees from the plane of the light control film an average optical transmittance of the light control film is less than about 20% in each of the predetermined first and second wavelength ranges. 
     In some embodiments, a light control film includes a plurality of spaced apart first regions and a second region, such that when an angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to a plane of the light control film, an average optical transmittance of the light control film changes by less than about 10% in a predetermined first wavelength range having shorter wavelengths, and greater than about 40% in a predetermined second wavelength range having longer wavelengths. 
     In some embodiments, a light control film includes a major microstructured first surface that includes a plurality of alternating ribs and channels. Each channel is at least partially filled with a first material to form a first region. The light control further includes a second region positioned adjacent at least a portion of at least one first region. The second region includes a second material. Each of the first and second materials absorbs light in one or two of a first wavelength range from about 300 nm to about 400 nm, a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 nm to about 1200 nm. Each channel includes a width W and a height H, where H/W≥1. 
     In some embodiments, a light source system includes a light source that is configured to emit light having a first spectral profile along a first direction and a second spectral profile along a different second direction. The light source system further includes a light control film that is disposed on the light source for receiving and transmitting light emitted by the light source. The light control film includes a plurality of spaced apart first regions. Each first region has a width W and a height H, where H/W≥1. The first regions are oriented relative to the first and second directions and have a spectral absorbance profile so that when light emitted by the light source is transmitted by the light control film, the transmitted light has a third spectral profile along the first direction and a fourth spectral profile along the second direction, where the difference between the third and fourth spectral profiles is less than the difference between the first and second spectral profiles. 
     In some embodiments, a retroreflective system includes a retroreflective sheet for retroreflecting light, and a light control film that is disposed on the retroreflective sheet. For a first wavelength, light incident on the light control film at each of a first and second angles of incidence is retroreflected, and for a second wavelength, light incident on the light control film at the first, but not the second, angle of incidence is retroreflected. In some cases, the light control film has a greater first viewing angle for the first wavelength and a smaller viewing angle for the second wavelength. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention may be more completely understood in consideration of the following detailed description in connection with the following figures. The figures are not necessarily drawn to scale. Like numbers used in the figures refer to like components. However, it will be understood that the use of a number to refer to a component in a given figure is not intended to limit the component in another figure labeled with the same number. 
         FIGS.  1 ,  1 A,  1 B,  1 C,  1 D,  1 E,  1 F and  1 G  are schematic cross-sectional views of exemplary light control films; 
         FIG.  2    is a schematic cross-sectional view of an exemplary optical communication system; 
         FIGS.  2 A and  2 B  are schematic perspective views of exemplary light control films; 
         FIG.  3    is a schematic cross-sectional view of an exemplary light control film; 
         FIG.  4    is a schematic cross-sectional view of another exemplary light control film; 
         FIG.  5    is a schematic plot of detector sensitivity vs. wavelength; 
         FIG.  6    is a schematic cross-sectional view of an exemplary light control film applied to a window of an enclosure, such as a building, a house or a vehicle; 
         FIG.  7    is a schematic plot of transmission of a light control film vs. wavelength; 
         FIG.  8    is a schematic view of an exemplary application where a light control film is applied to a plane or an aircraft; 
         FIG.  9    is a plot of transmission vs. wavelength of an exemplary light control film; 
         FIG.  10    is a schematic of an exemplary optical communication system including a light control film and a light source; 
         FIG.  10 A  is a schematic plot of spectral profile of light emitted by the light source of  FIG.  10    along different directions; 
         FIG.  10 B  is a schematic plot of spectral profile of light transmitted by the light control of  FIG.  10    along different directions; 
         FIG.  10 C  is a schematic plot of absorbance of portions of the light control film of  FIG.  10   ; 
         FIG.  11    is a schematic cross-sectional view of an exemplary optical communication system including a light control film combined with a retroreflector; and 
         FIG.  12    is a schematic cross-sectional view of an exemplary wearable optical communication system including a light control film and a wrist watch with a pulse sensor. 
     
    
    
     DETAILED DESCRIPTION 
     In the following description, reference is made to the accompanying figures that form a part thereof and in which various embodiments are shown by way of illustration. It is to be understood that other embodiments are contemplated and may be made without departing from the scope or spirit of the present disclosure. The following detailed description, therefore, is not to be taken in a limiting sense. 
     The louver structure is known as having angle selectivity such that in privacy applications, such as when the louver structure is placed in front of a display, a viewer can see the displayed images only when the viewer is within the viewing angle of the louver structure, and in window applications, such as when the louver structure is placed on, for example, a building window, the sun light can go through the window only for light rays that are within the viewing angle of the louver structure. The “viewing angle” is defined herein with respect to the normal to the plane of the structure as the range of angles over which the louver structure is substantially transmissive. For example, the viewing angle of a light control film may be defined as the range of angles over which the transmission of the light control film is within 60%, or within 50%, or within 40% of the peak transmission. One type of the louver structure in the privacy film which typically includes a substantially transparent louver film disposed on a polymeric substrate where the louvers include light absorbing material resulting in alternating transparent and light absorbing regions. The light absorbing regions are relatively positioned to provide a restricted viewing angle. Exemplary louver structures are described in U.S. Pat. No. 6,398,370 B1 (Chiu et al.), U.S. Pat. No. 8,213,082 B2 (Gaides et al.) and U.S. Pat. No. 9,229,253 B2 (Schwartz et al.). 
     The louver structures disclosed herein may be applied to various optical applications such as optical communication systems having a light source, an optical construction, and/or a detector system where the optical construction includes a light control film to make the optical communication systems angle selective and/or spectral selective. In some cases, in addition to one or more louver structures, an optical communication system may also have other films or structures to provide additional or enhanced angle selectivity. The louver structures, and other films or structures may have 2 dimensional or 3 dimensional structures. Exemplary additional structures that may be included in an optical communication system include optical diffusers, brightness enhancement films and reflective polarizers. In some embodiments, the disclosed light control films include light absorbing or reflecting regions including light absorbing or reflecting materials that make the regions wavelength selective (spectral selective). In some embodiments, the light control film has at least two different types of materials and each material may absorb or reflect light differently in at least a part of at least one of ultraviolet, visible and infrared wavelength ranges. With the variety of combinations among the louver structures and the light absorbing or reflecting materials, the light control film can have a variety of angle selectivity and wavelength selectivity (spectral selectivity) so that the light control film can be applied in many applications for variety of purposes. 
       FIG.  1    and  FIGS.  1 A- 1 G  show schematic cross-sectional views of exemplary optical films that may be useful in forming a light control film (LCF). A LCF  100  includes an optical film  150  and the optical film  150  has a major first surface  110  and a major second surface  120  opposed to the first surface  110 . The optical film  150  includes at least one microstructured surface. For example, either the first surface  110  or the second surface  120  or both surfaces may be microstructured. For instance,  FIGS.  1 A,  1 D,  1 F and  1 G , show that the first surface  110  is microstructured and  FIG.  1 B  shows that the second surface  120  is microstructured and  FIG.  1 C  shows that both major surfaces  110  and  120  are microstructured. While the major surfaces  110  and  120  are referred to as the respective first surface and the second surface for reference purposes, it will be recognized that in use, the first surface may be facing a viewer or a light source, the second surface may be facing a viewer or a light source, or either the first surface or the second surface may be facing both a viewer and a light source. Microstructures are generally projections, protrusions and/or indentations in the surface of an article that deviate in profile from an average center line drawn through the microstructure. For example, as shown in  FIG.  1   , the first surface  110  has a plurality of alternating ribs  180  and channels  130  extending across the first surface  110  of the optical film  150 . Each channel  130  is at least partially filled with a first material  132  to form a first region. In some cases, such as in the case of the LCF  100  shown schematically in, for example,  FIGS.  1 A and  1 B , channels  130  do not extend across the entire thickness of the optical film  150  resulting in a continuous land  131  between the base of the channels  130  and the second surface  120  of the optical film  150 . In some cases, such as in the case of the LCF  100  shown schematically in  FIG.  1 D , at least some of the channels  130  extend all the way through the thickness of the optical film  150  resulting in no or a discontinuous land  131 . In some cases, the channels  130  may become first regions by at least partially filling each channel with a first material  132 . As shown in  FIG.  1 C , the channels or the first regions  130  may be formed on both the first surface  110  and the second surface  120  of the optical film  150 . In some cases, the optical film  150  also includes a second region  140  that is adjacent at least a portion of at least one first region and includes a second material  142 . In the exemplary embodiments shown in  FIGS.  1 A,  1 B,  1 C,  1 F and  1 G , the second region  140  is formed on at least one of the first surface  110  and second surface  120 . The second region  140  in these embodiments may be coated, printed or laminated with the second material  142  on at least one of the first surface  110  and second surface  120 . As another example, in  FIG.  1 D , the second region  140  is formed inside the optical film  150  between and/or below the first regions  130 . In general, in the case of alternating first and second regions, the second regions may have a connecting portion, for example, in the form of a land portion, connecting the second regions near at least one of the first and second major surfaces, where the connecting or land portion may or may not be continuous. For example, the second regions  140  are connected by a discontinuous land  131 . As another example, in  FIG.  1 E , the second regions  140  are connected to one another near each of the major surfaces by continuous land portions  131 . Furthermore, in some cases, such as the exemplary light control film  100  shown in  FIG.  1 E , the second region  140  include a plurality of second region segments alternating with the plurality of first regions  130 . In some cases, the second region  140  is formed on at least portion or portions of the first surface  110  and/or second surface  120 . For example, the second region  140  is formed on a portion or spaced part portions of the first surface  110 , as shown in  FIGS.  1 F and  1 G , where in the exemplary embodiment shown in  FIG.  1 G , the second region  140  is disposed on at least portions of the ribs  180 . As shown in  FIG.  1 F , the second region  140  is formed on spaced apart portions of the first surface  110  resulting in a discontinuous second region having a plurality of second region segments  140  alternating with the first regions  130 . In each of the exemplary embodiments shown in  FIGS.  1 D and  1 G , the first and second regions alternate, and each second region has a width W and a height W. In  FIG.  1 D , H/W is typically greater than 1 or greater than 2 or greater than 5, and in  FIG.  1 G , H/W is typically greater than 1 or greater than 2 or greater than 5. Furthermore, as shown in  FIG.  1 G , the second region  140  is disposed on at least portions of the ribs  180 . In general, the first regions  130  and the second region  140  may be formed in the same layer or different layers of the LCF  100 . For example, in  FIGS.  1 A,  1 B,  1 F and  1 G , the first and second regions  130  and  140  are formed in two neighboring layers of the LCF  100 . As another example, in  FIGS.  1 D and  1 E , the first and second regions  130  and  140  are both formed in the same optical film  150 . Moreover, each of the first and second materials  132  and  142  absorbs and/or reflects light in one or two of a first ultraviolet wavelength range from about 300 nm to about 400 nm, a second visible wavelength range from about 400 nm to about 700 nm, and a third near infrared wavelength range from about 700 nm to about 1200 nm. In some cases, such as in the exemplary embodiment shown in  FIG.  1   , each channel  130  and each rib  180  has a height H. Furthermore, each channel  130  has a width W and each rib  180  has a width Y, and pitch P indicates spacing of the channels  130  and the ribs  180 . Width Y of the rib is P−W. The land  131  has a height L such that the thickness of the film  150  is H+L. The channel aspect ratio for the film  150  is defined as H/W, and rib aspect ratio as H/Y. In some cases, H/W≥1, or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. In some embodiments, the rib aspect ratio H/Y is greater than about 0.1, or 0.5, or 1 or 1.5, or greater than about 2.0, or greater than about 3.0. In some cases, the height of the land  131  (L) is typically minimized to optimize light absorption once the channels  130  are filled with the first material  132  such as light absorbers or reflectors while sufficiently thick to support a large number of ribs  180 . The exemplary ribs  180  in  FIG.  1    have sides or walls  105  that are substantially parallel to each other, although, in general, the walls  105  may be angled and have any shape that may be desirable in an application such as shown, for example, in FIG. 4 of U.S. Pat. No. 9,229,261 (Schwartz et al.). Parameters “H”, “W”, “P”, “Y”, “L” and indices of refraction of the LCF materials may have any suitable values as long as the LCF  100  functions as desired. 
       FIG.  2    shows partial schematic cross-sectional view of another exemplary optical film that may be useful in forming a light control film (LCF). LCF  200  includes an optical film  250  and the optical film  250  has a major microstructured first surface  210  and a major second surface  220  opposed to the first surface  210 . The microstructured first surface  210  has a plurality of alternating ribs  280  and channels  230  extending across the first surface  210  of the optical film  250 . Each channel  230  is at least partially filled with a first material  232  to form at least one of first regions  230  in the plurality of spaced apart first regions  230 . At least one of the ribs  280  a second material  242  to form a second region  240 . A continuous land  231  may be present between the base of the channels  230  and the second surface  220 . Each channels  230  and ribs  280  has a height H. Each channels  230  has a width W and each ribs  280  has a width Y, and pitch P indicates spacing of the channels  230  and the ribs  280 . Width Y of the rib is P−W. The land  231  has a height L such that the thickness of the film  250  is H+L. The spacing and shape of the channels  230  and/or the ribs  280  determine viewing angle  2 θv, where  2 θv is the angle between limiting light rays  202  and  204  transmitted by channels  230  without reflection from walls  205 . In general, parameters/dimensions of the channels/ribs are selected such that a desired viewing angle  2 θv is provided by the LCF  200 . In one aspect, the viewing angle  2 θv ranges from 10 degree to 80 degree or, or about 10 degrees to about 70 degrees. In some cases, the viewing angle is less than about 80 degrees, or less than about 75 degrees, or less than about 70 degrees, or less than about 65 degrees, or less than about 60 degrees, or less than about 55 degrees, or less than about 50 degrees, or less than about 45 degrees, or less than about 40 degrees, or less than about 35 degrees, or less than about 30 degrees, or less than about 25 degrees, or less than about 20 degrees, or less than about 15 degrees, or less than about 10 degrees, or less than about 5 degrees. In general, it is desirable for the LCF parameters to be selected such that an adequate amount of light can pass through the optical film  250 . In some cases, narrower channels width W and larger pitch P may lead to increased viewing angle  2 θv and the amount of light passing through the LCF  200  may be increased. In some cases, increasing the channel aspect ratio (H/W) and reducing the pitch “P” may decrease the viewing angle  2 θv. In some cases, a LCF  200  includes a plurality of spaced apart first regions  230 . Each first region  230  has a substantially low transmission in one or two of a first wavelength range from about 300 nm to about 400 nm, a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 nm to about 1200 nm, and a substantially high transmission in remaining wavelength ranges. In some embodiments, the LCF  200  includes a first viewing angle  2 θv of less than about 70 degrees along a predetermined first direction A. 
     In some embodiments, LCF  200  includes a plurality of spaced apart parallel first regions  230 . LCF  200  also includes an optical film  250  having a major first surface  210  and an opposing major second surface  220 . The plurality of first regions  230  are formed in the major first surface  210  and extend into the optical film  250  and may or may not reach the major surface second  220 . In the exemplary LCF  200  shown in  FIG.  2 A , the first regions  230  may be generally referred to as two-dimensional regions or structures meaning that the width W and the height H of each region  230  are much smaller than the length L′ of the first region  230 . As such, each first region  230  may be thought of as having finite extents along two dimensions (width W and height H) while extending infinitely along the third dimension (length L′). As shown in  FIG.  2 A , the first regions  230  are extended along a first direction “A” and the LCF  200  has a first viewing angle  2 θv along the first direction “A”. In some cases, the first viewing angle  2 θv along the predetermined first direction A may be less than about 70 degrees, or less than about 60 degrees, or less than about 50 degrees, or less than about 40 degrees, or less than about 30 degrees. In some embodiments, LCF  200  may have three-dimensional first regions  230  having finite extents along three mutually orthogonal directions. For example,  FIG.  2 B  shows another LCF  200  that includes a plurality of three-dimensional first regions  230  extending into the optical film  250  from the first surface  210  toward the second surface  220 . As shown in  FIG.  2 B , the first regions  230  are extended along a first direction “A” and also extended along a second direction “B”. The LCF  200  has a first viewing angle  2 θv along the first direction “A” and a second viewing angle along an orthogonal predetermined second direction “B”, where the second viewing angle may be equal to or different from the first viewing angle  2 θv. In some cases, the first viewing angle  2 θv along the predetermined first direction “A” may be less than about 70 degrees, or less than about 60 degrees, or less than about 50 degrees, or less than about 40 degrees, or less than about 30 degrees. In some embodiments, the second viewing angle along the predetermined second direction “B” may be less than about 70 degrees, or less than about 60 degrees, or less than about 50 degrees, or less than about 40 degrees, or less than about 30 degrees. The cross-sectional views of the first regions  230  perpendicular to the thickness direction may be square, rectangle, triangle, circle, ellipse, or any combination thereof, or any shape that may be desirable in an application. In general, an LCF may include one or more of the optical films disclosed herein combined with other films such as those described in, for example, U.S. Pat. No. 6,398,370 incorporated herein in its entirety. In some cases, the first regions  230  in  FIG.  2 B  may be posts, pyramids, cones, truncated cones, truncated pyramids, hemispheres, or any shape that may be desirable in an application. Furthermore, the first regions  230  may be asymmetric structures, symmetric structures, tilted structures, spatially variant structures, and any other structure that may be desirable in an application such as any structure that includes angular-dependent light transmitting or light blocking capabilities. In some embodiments, each rib  280  has a substantially high transmission in each wavelength range that the first regions  230  have a substantially low transmission in. In other embodiments, each rib  280  has a substantially low transmission in at least one wavelength range that the first regions  230  have a substantially high transmission in. In some cases, the LCF  200  includes a plurality of second regions  240  alternating with the plurality of first regions  230 , each second region  240  having a substantially high transmission in each wavelength range the first regions  230  have a substantially low transmission in. In some embodiments, the LCF  200  includes a plurality of second regions  240  alternating with the plurality of first regions  230 , each second region  240  having a substantially low transmission in at least one wavelength range the first regions  230  have a substantially high transmission in. In some examples, the LCF  200  may includes a second region  240  extending across and covering at least some of the first regions  230  as shown in  FIGS.  1 A,  1 B,  1 F and  1 G . The second region  240  has a substantially low transmission in at most one, but not all, wavelength regions the first regions  230  have a substantially high transmission in. In some embodiments, the first wavelength range is from about 350 nm to about 400 nm, or from about 350 nm to about 380 nm. In some embodiments, the second wavelength range is from about 400 nm to about 460 nm, or from about 470 nm to about 550 nm. In some embodiments, the third wavelength range is from about 800 nm to about 1000 nm, or from about 820 nm to about 1200 nm, or from about 885 nm to about 1200 nm, or from about 920 nm to about 1200 nm. 
     In some cases, an LCF  200 , for example as shown in  FIG.  2   , may includes a major microstructured first surface  210  having a plurality of alternating ribs  280  and channels  230 . Each channel  230  is at least partially filled with a first material  232 . The channel aspect ratio for the optical film  250  is defined as H/W. In some cases, the aspect ratio H/W is at least 1 (H/W≥1), or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. Each rib  280  includes a second material  242 . In some cases, an absorption of at least one of the first and second materials  232  and  242  varies as a function of wavelength in a range from about 400 nm to about 1200. In other cases, the absorption of each of the first and second materials  232  and  242  varies as a function of wavelength in a range from about 400 nm to about 1200. 
       FIG.  3    shows a schematic cross-sectional view of an exemplary optical film that may be useful in forming a light control film (LCF). As shown in  FIG.  3   , an optical film  350  includes a major first surface  310  and a plurality of spaced apart substantially parallel first regions  330  formed in, and extending from, the major first surface toward an opposing major second surface  320 , and a second region  340  provided on the major first surface  310  and extending across and covering the plurality of first regions  330 . The first regions  330  may be filled at least partially with a first material  332  and the second region  340  may include a second material  342 . In some cases, the first material  332  and the second material  342  absorb, reflect or block light to have a substantially low transmission in one or two of a first wavelength range from about 300 nm to about 400 nm, a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 nm to about 1200 nm, and a substantially high transmission in the remaining wavelength ranges. In some cases, the second region  340  may be coated, printed or laminated with the second material  342  on at least one of the first surface  310  and second surface  320 . In some embodiments, the first material  332  or the second material  342  may include a pigment, a dye, a black colorant such as a carbon black, or combinations thereof so that the first and second materials  332  and  342  may absorb or reflect light. A variety of light absorbers or light reflectors may be used in the disclosed LCFs. For example, several compositions of visibly transparent infrared absorbing transparent conducting oxides (TCOs) both as thin films and nanoparticle powders and dispersions may be included useful in the disclosed LCFs. Exemplary TCOs include indium tin oxide (ITO), antimony tin oxide (ATO), gallium tin oxide (GTO), antimony zinc oxide (AZO), aluminum/indium doped zinc oxide, doped tungsten oxides like cesium tungsten oxides, and tungsten blue oxides. Other visibly transparent infrared absorbers include metal borides like lanthanum hexaborides, and conducting polymer nanoparticles like PEDOT-PSS. Metal chalcogenides like metal sulfides and selenides also absorb infrared light including, for example, copper sulfide and copper selenide nanoparticles, tungsten disulfides and molybdenum disulfides. Another class of visibly transparent tunable infrared absorbers are metallic plasmonic nanoparticles such as those made of gold, silver copper etc. Moreover, near infrared dyes and pigments may be applied to the disclosed LCFs. These dyes have low visible absorption but strong narrow band infrared absorption. Many of these dyes and pigments are organic/organometallic or metal organic in nature. Some of major classes of dyes/pigments include phthalocyanines, cyanine, transitional metal dithioline, squarilium, croconium, quiniones, anthraquinones, iminium, pyriliu, thiapyrilium, azulenium, azo, perylene and indoanilines. Many of these dyes and pigments can exhibit both visible and/or infrared lights absorption as well. Further, many different types of visible dyes and colorants may be used with the disclosed LCFs and they fall in one or more classes like acid dyes, azoic coloring matters, coupling components, diazo components. Basic dyes include developers, direct dyes, disperse dyes, fluorescent brightners, food dyes, ingrain dyes, leather dyes, mordant dyes, natural dyes and pigments, oxidation bases, pigments, reactive dyes, reducing agents, solvent dyes, sulfur dyes, condense sulfur dyes, vat dyes. Some of the organic pigments may belong to one of more monoazo, azo condensation insoluble metal salts of acid dyes and disazo, naphthols, arylides, diarylides, pyrazolone, acetoarylides, naphthanilides, phthalocyanines, anthraquinone, perylene, flavanthrone, triphendioxazine, metal complexes, quinacridone, polypryrrolopyrrole etc. Moreover, metal oxide pigments may be used in the disclosed LCFs. For example, metal chromates, molybdates, titanates, tungstates, aluminates, ferrites are some of the common pigments. Many contain transition metals like iron, managanese, nickel, titanium, vanadium, antimony, cobalt, lead, cadmium, chromium etc. Bismuth vanadates are non-cadmium yellows. These pigments may be milled to create nanoparticles which may be useful where transparency and low scattering is desired. In some examples, the first or second materials  332  or  342  may be a particulate materials having an average particle size less than 10 microns, or 1 micron, or less. The first or second materials  332  or  342  may, in some embodiments, have a mean particle size of less than 1 micron. In some embodiments, the first or second materials  332  or  342  may be dispersed in a suitable binder. In some embodiments, rather than in the form of particles, the first or second materials  332  or  342  may be a light absorbing resin, such as a light absorbing polymer, at least partially forming light absorbing regions  330  and  340 . In some cases, the first regions  330  may include particles or scattering elements that may function to block light from being transmitted through the first regions  330 . In some cases, at least one of the first material  332  and the second material  342  may be selected among the materials that are spectrally selective in at least a part of at least one of ultraviolet, visible and infrared light ranges. In some cases, both the first material  332  and the second material  342  may be selected among the materials that are spectrally selective in at least a part of at least one of ultraviolet, visible and infrared light ranges so that a transmission of a light passing through the LCF  300  is spectrally selective in at least two of the ultraviolet, visible and infrared light ranges. Stated differently, the first and second materials  332  and  342  are spectrally selective in at least a part of ultraviolet, visible and infrared light ranges in order to make the transmission vary as a function of wavelength of light. As shown in  FIG.  3   , a “light B” propagates along an axis that is normal to the plane of the LCF  300 . As described herein, by “normal” to the LCF is meant perpendicular to the plane of the LCF, discounting any local variation in the smoothness of the LCF where the variation may, for example, be general surface roughness or a regular microstructure formed in a major surface of the LCF. For the purpose of this disclosure, the angle between an incident light ray “b” and the normal to the LCF is referred to as the “incidence angle, θi”. For example, the incidence angle of light B is zero. In general, the incidence angle may range from 0 degree (i.e. normal to the film) to 90 degree (i.e. parallel to the film). Therefore, “normal incidence angle” may mean incident perpendicularly to the film, discounting any local variation in the LCF. In some embodiments, at the normal incidence angle where a viewer is looking at an image through the LCF  300  in a direction that is perpendicular to the film surface, the image is viewable and brightest and the transmission of a light passing through the LCF  300  may be greatest. In some embodiments, such as when the channels or first regions  330  are symmetric and oriented perpendicularly to the LCF  300 , as the incidence angle increases, the amount of light transmitted through the LCF  300  decreases until the incidence angle reaches the viewing angle  2 θv from which point on substantially all the light is blocked by the first material  332  as shown in  FIG.  3    as a “light A” and the image is no longer viewable. In some embodiments, the transmission of a light passing through the second region  340  and at least partially absorbed by the second material  342  is substantially uniform for at least one incidence angle. For example, the transmission of a “light C” as shown in the  FIG.  3   , passing through the second region  340  and being partially absorbed by the second material  342  and exiting the LCF  300  (without going through the first regions  330  or being absorbed by the first material  332 ) is substantially uniform. In some embodiments, second region  340  absorbs some light in a pre-determined wavelength range, and in some cases, absorbs substantially all incident light having wavelengths in the pre-determined wavelength range. In some cases, the optical transmission of a light C having a wavelength in the pre-determined wavelength range and passing through the second region  340  may be less than about 10%, where in some cases, the transmission may be substantially independent from the incidence angle of the light C. In some cases, in order to achieve the transmission of a light having a wavelength in the pre-determined wavelength range and passing through the second region  340  be less than about 10%, thickness or size of the second materials  342  may be increased, or the second region  340  might include multiple layers of the second materials  342 , or the multiple layers of the second materials  342  may be provided on at least one of the first surface  310  and second surface  320 , or either first or second surfaces  310  and  320  may include multiple layers of the second materials  342 , or the concentration of the second materials  342  may be increased. In some cases, the transmission of a light having a wavelength in the pre-determined wavelength range may be less than 10% by providing scattering particles in and/or on the optical film  350 . 
     In some embodiments, the optical film  350  described in the present invention may also include a base substrate layer (not shown), which may be integrally formed with, or separately added to the optical film  350  (whether by extrusion, cast-and-cure, or any other known that may be suitable in a desired application). The chemical composition and thickness of the base material may depend on the requirements of the product that is being constructed. That is, balancing the needs for strength, clarity, optical retardance, temperature resistance, surface energy, adherence to the other layers, among others, as specifically described in, for example, U.S. Pat. No. 8,213,082 (Gaides et al.) incorporated herein in its entirety. In some embodiments, the optical film  350  may be combined with a cover layer that may provide, for instance, an anti-glare coating, an anti-reflective coating, an anti-soiling coating, or some combination thereof. Materials for the base substrate layer or the cover layer may include, for instance, polycarbonate. The particular polycarbonate material may be selected so as to provide a matte finish or a glossy finish. The cover layer and base substrate layer may be each or both be matte or/and glossy. The cover layer may be bonded to the second region  340  or the major first surface  310  of the optical film  350  with an adhesive. The adhesive may be any optically clear adhesive, such as a UV-curable acrylate adhesive, a transfer adhesive, and the like. Moreover, the LCF  300  may include any number of other films or layers including, for example, polarizing film, wavelength selective interference filter layer, prismatic film to form multilayer structures. 
     In some embodiments, the disclosed light control or optical films, such as optical film  350 , may be prepared by molding and ultraviolet curing a polymerizable resin on a polycarbonate substrate. Such processing are currently used to make known optical films available from 3M Company, St. Paul, Minn., under the trade designation. An exemplary manufacturing method and suitable composition for known optical films are described in U.S. Pat. No. 8,213,082 (Gaides et al.). 
     Referring to  FIG.  4   , a light control film (LCF)  400  includes a plurality of spaced apart first regions  430 . Each first region  430  includes a first material  432 . As shown in  FIG.  4   , the first regions  430  may have a wide variety of shapes and may extend from either/both the first surface  410  or/and the second surface  420  or be formed in the middle of the optical film  450 . The first material  432  substantially absorbs or/and reflects light in a first wavelength range and substantially transmits light in a different second wavelength range. For example, in some cases, the first material  432  absorbs or/and reflects at least 70%, or at least 80%, or at least 90%, or at least 95% of light in the first wavelength range, and transmits at least 70%, or at least 80%, or at least 90%, or at least 95% of light in the second wavelength range. In some cases, the first wavelength range is an infrared light range, and the second wavelength range is a visible light range. For example, in some cases, the first wavelength range may be from about 700 nm to about 1200 nm, and the second wavelength range may be from about 400 nm to about 700 nm. LCF  400  further includes a second region  440  disposed adjacent at least a portion of at least one first region  430 . In some cases, such as in the exemplary embodiment of the LCF  400  shown in  FIG.  4   , second region  440  extends across a majority, but not all, of the first regions  430 . In some cases, second region  440  may extend across all first regions  430 . The second region  440  includes a second material  442  that substantially absorbs or/and reflects light in a third wavelength range and substantially transmits light in a fourth wavelength range different from the third wavelength range. For example, in some cases, the second material  442  absorbs or/and reflects at least 70%, or at least 80%, or at least 90%, or at least 95% of light in the third wavelength range, and transmits at least 70%, or at least 80%, or at least 90%, or at least 95% of light in the fourth wavelength range. In some cases, the third wavelength range is a ultraviolet light range, and the fourth wavelength range is a visible light range. For example, in some cases, the third wavelength range may be from about 350 nm to about 400 nm, and the fourth wavelength range may be from about 400 nm to about 700 nm. The transmission of a light  490  passing through the LCF  400  varies as a function of an incidence angle (θi) (the angle between an incident light  490  and the normal  495  to the LCF) and a wavelength of the light. For example, the transmission is: (1) no more than about 10% of incident light in a ultraviolet light range substantially independent of the incidence angle; (2) greater than about 40% for light in a visible light range substantially independent of the incidence angle; (3) greater than about 40% for light in an infrared light range for the incidence angles within a viewing angle ( 2 θv refer to the  FIG.  2   ); and (4) less than about 10% for light in the infrared light range for the incidence angles outside the viewing angle. 
     In some embodiments, as shown in  FIG.  1   , an LCF  100  includes a plurality of spaced apart first regions  130  and a second region  140 . Each first region  130  may have a substantially low transmission in a first near infrared wavelength range from about 700 nm to about 1200 nm and the second region  140  may have a substantially low transmission in a second ultraviolet wavelength range from about 300 nm to about 400 nm. The second region  140  is adjacent at least a portion of at least one first region  130 . In the exemplary embodiments shown in  FIGS.  1 A,  1 B   1 F and  1 G, the second region  140  is formed on at least one of the respective first surface  110  and second surface  120 . As another example, in  FIG.  1 D , the second region  140  is formed in the optical film  150  between and/or below the first regions  130 . In some embodiments, when at least some of the first regions  130  may extend all the way through the thickness of the optical film  150 , the second region  140  is formed between channels  130  resulting in a plurality of spaced apart second regions  141  interconnected via a land  131  which in some cases, may be continuous and in some other cases, may be discontinuous. Further, in some cases, as shown in  FIG.  1 E , the second region  140  includes a plurality of segments alternating with the plurality of first regions  130 . In some cases, the second region  140  is disposed in at least portions of the ribs  180 . In some embodiments, the second region  140  is formed on at least one of the first surface  110 . As shown in  FIGS.  1 F and  1 G , the second region  140  is partially formed on the first surface  110  and/or second surface  120 . As shown in FIG. IF, the second region  140  may be partially formed on the first surface  110  alternating with the first regions  130 . Furthermore, as shown in  FIG.  1 G , the second region  140  is disposed on at least portions of the ribs  180 . 
     In some embodiments, as shown in  FIG.  1   , an LCF  100  includes a plurality of spaced apart first regions  130  and a second region  140 . Each first region  130  may have a substantially low transmission in at least one of a first wavelength range from about 300 nm to about 400 nm and a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 to about 1200 nm. The second region  140  may have a substantially low transmission in at least one of the at least one of the three wavelength ranges each first region has substantially low transmission in. In some cases, each first region  130  and the second region  140  may have substantially low transmission in the same two of the three wavelength ranges. LCF  100  includes a major microstructured first surface  110  that includes a plurality of alternating ribs  180  and channels  130 , where each channel is at least partially filled with a first material  132  to form one of the first regions  130  in the plurality of spaced apart first regions. In some cases, the second region  140  includes a plurality of second region segments, and each rib includes one of the second region segments. In some cases, the second region  140  is disposed on the major surface  110  of the light control film, where, in some cases, the second region extends across and covers at least some of the first regions  130 . 
     In some embodiments, as shown in  FIG.  1   , a LCF  100  includes a plurality of spaced apart first regions  130  and a second region  140 . Each first region  130  may have a substantially high transmission in a first wavelength range from about 300 nm to about 400 nm and a substantially low transmission in a second wavelength range from about 400 nm to about 700 nm. The second regions  140  may have a substantially high transmission in each of the first and second wavelength regions. In some cases, each first region  130  and the second region  140  may have substantially high transmissions in a third wavelength range from about 700 nm to about 1200 nm. In some examples, each first region  130  may have a substantially low transmission region in a third wavelength range from about 700 nm to about 1200 nm, and the second region has a substantially high transmission region in the third wavelength range. 
     In some examples, the light control films (LCFs) disclosed herein may be part of an optical communication system. The “optical communication system” as referred to herein is a system that is for communication of light over a distance from a light source through a disclosed LCF to a target, where the target may include a detector or human eye and the light source my include ambient light. In general the light source the light source may be any light source desirable in an application. Exemplary light source include a light emitting diode (LED), a laser light source, a halogen light source, a metal halide light source, a tungsten light source, a mercury vapor light source, a short arc xenon light source, or the sun. In some cases, the LCFs disclosed herein may be part of an optical communication system with a detector system. In some cases, the detector system may provide various types of outputs, such as electronic signals, when receiving light passing through the LCF of the optical communication system. In an exemplary examples as shown in  FIG.  2   , a detector system includes a detector  290  that is sensitive to wavelengths in a detection wavelength range and an LCF  200  disposed on the detector  290 . The LCF  200  includes a plurality of alternating first and second regions  230  and  240 . Each first region  230  has a width W and a height H and an aspect ratio H/W. In some cases, the aspect ratio H/W is at least 1 (H/W≥1), or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20.  FIG.  5    schematically shows the relation between the detector sensitivity and wavelength illustrating that the detector is sensitive to wavelengths in the detection wavelength range  572 . Each first region  230  has a substantially low transmission in a first portion  574  of the detection wavelength range  572  and a substantially high transmission in the remaining portion  576  of the detection wavelength range. Each second region has a substantially high transmission in the detection wavelength range  572 . In some cases, the detection wavelength range  572  is from about 800 nm to about 1600 nm and the first portion  574  of the detection wavelength range  572  is from about 900 nm to about 1100 nm. In some examples, a viewing angle  2 θv of the LCF in the first portion  574  of the detection wavelength range  572  is less than about 70 degrees along a first direction “A” (referring to  FIG.  2 ,  2 A or  2 B ). In some cases, the detector is or includes a photovoltaic device. In some cases, the detector is configured to detect solar radiation, for example, to charge a battery. In such cases, the detector is or may include a solar battery, a solar cell, or a solar detector. In some cases, the detector may be the detector in a camera for detecting and/or recording an image. In some cases, the detector may be a in a camera or camera system. In some cases, a camera may include the detector system of  FIG.  2   . 
     In some cases, as shown in  FIG.  2   , an LCF  200  includes a plurality of spaced apart first regions  230  and a second region  240 . Each first region  230  has a width W and a height H and an aspect ratio H/W that is at least 1 (H/W≥1) or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. Each first region  230  has substantially low transmissions in each of non-overlapping predetermined first and second wavelength ranges and the second region  240  has a substantially low transmission in the predetermined second wavelength range. Specifically, the predetermined first wavelength range may include shorter wavelengths and the predetermined second wavelength range may include longer wavelengths. In some cases, the predetermined first wavelength range may be from about 400 nm to about 700 nm and the predetermined second wavelength range may be from about 700 nm to about 1200 nm. In some cases, the average optical transmittance of each first region  230  in the predetermined first wavelength range may be less than about 25, or 15%, or 10%, or 5%, or 1%, or 0.1%, or 0.01%, or 0.001, or 0.0001%. In some cases, the average optical transmittance of each first region  230  in the predetermined second wavelength range is less than about 25, or 15%, or 10%%, or 5%, or 1%, or 0.1%, or 0.01%, or 0.001, or 0.0001. In some cases, the average optical transmittance of the second region  240  in the predetermined second wavelength range may be less than about 25, or 15%, or 10%%, or 5%, or 1%, or 0.1%, or 0.01%, or 0.001, or 0.0001. Each first region  230  may have a substantially high absorption in the predetermined first wavelength range. For example, the average optical absorption of each first region  230  in the predetermined second wavelength range may be greater than about 70%, or 80%, or 90%, or 95%, or 99%. Each first region may have a substantially high reflectance in the predetermined first wavelength range. For example, the average optical reflectance of each first region  230  in the predetermined second wavelength range may be greater than about 70%, or 80%, or 90%, or 95%, or 99%. In general, each first region  230  may have a first index of refraction, and the second region may have a second index of refraction. In some embodiments, it may be desirable to substantially match indices of refraction between the first regions and the regions between them and/or between the first regions and the second region. In some cases, a difference between the first and second indices of refraction may be less than about 0.01. In some cases, the second region  240  may have a substantially low transmission in the predetermined first wavelength range. In such cases, the average optical transmittance of the second region  240  in the predetermined second wavelength range may be less than about 10%. In some embodiments, the second region  240  may have a substantially high transmission in the predetermined first wavelength range. In such cases, the average optical transmittance of the second region  240  in the predetermined first wavelength range may be greater than about 70%. The second region  140  may include a plurality of segments alternating with the plurality of first regions  130  as shown in, for example,  FIG.  1 E . In some cases, the second region  140  may extend across and cover at least some of the first regions  130  as shown in, for example,  FIGS.  1 ,  1 A,  1 B,  1 F and  1 G . Furthermore, in some cases, the second region  140  may be discontinuous as shown in, for example,  FIGS.  1 E and  1 F . 
     In some embodiments, as shown in  FIG.  2   , an LCF  200  includes a plurality of spaced apart first regions  230  and a second region  240 . Each first region  230  may have a width W and a height H and an aspect ratio H/W that is at least 1 (H/W≥1) or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. Each first region may have substantially low transmissions in each of non-overlapping predetermined first and second wavelength ranges and the second region  240  may have substantially high transmission in the predetermined second wavelength range. In exemplary embodiments, the predetermined first wavelength range may include shorter wavelengths and the predetermined second wavelength range may include longer wavelengths. In some cases, the predetermined first wavelength range may be from about 400 nm to about 700 nm and the predetermined second wavelength range may be from about 700 nm to about 1200 nm. In some cases, the average optical transmittance of each first region  230  in the predetermined first wavelength range may be less than about 10%. In some cases, the average optical transmittance of each first region in the predetermined second wavelength range may be less than about 10%. In some cases, the average optical transmittance of the second region in the predetermined second wavelength range may be greater than about 70%. In some embodiments, the second region may have a substantially low transmission in the predetermined first wavelength range. For example, the average optical transmittance of the second region  240  in the predetermined first wavelength range may be less than about 10%. In some cases, the second region  240  may have a substantially high transmission in the predetermined first wavelength range. For example, the average optical transmittance of the second region in the predetermined first wavelength range may be greater than about 70%. 
     In some cases, as shown in  FIG.  2   , an LCF  200  includes a plurality of spaced apart first regions  230  and a second region  240 . Each first region  230  may have a width W and a height H and an aspect ratio H/W that is at least 1 (H/W≥1) or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. Each first region  230  may have a substantially high transmission in a predetermined first wavelength range and a substantially low transmission in a predetermined non-overlapping second wavelength range. The second region  240  may have substantially high transmission in each of the predetermined first and second wavelength ranges. 
     In some cases, the light control films (LCFs) disclosed herein may be part of an optical communication system including an optical construction combined with, for example, a window as shown in  FIG.  6   . In this example, the LCF  600  is a part of an optical construction  601  with a natural light source such as sun light  690 . In particular,  FIG.  6    shows an exemplary application of a disclosed LCF applied to a window to an enclosure, such as a building, a house or a vehicle. LCF  600  may be disposed on a window substrate  675  of a building, a house, a car or any enclosure  670 . The LCF  600  includes an optical film  650  that includes a plurality of spaced apart first regions  630  and a second region  640  adjacent at least a portion of at least one first region  630 . The first regions  630  may be filled at least partially with a first material  632  and the second region  640  may include a second material  642 . The first material  632  and the first region  630  may be any suitable material and shape such that each first region  630  has an average optical transmittance of greater than about 50%, or 60%, or 70%, or 80%, or 90% in a first wavelength range from about 400 nm to about 700 nm and an average optical transmittance of less than about 10% in a non-overlapping second wavelength range from about 700 nm to about 1200 nm. The second material  642  and the second region  640  may be any suitable material and shape such that the second region  540  has an average optical transmittance of greater than about 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90% in each of the predetermined first and second wavelength ranges. In addition, the second region  640  may have an average optical transmittance of less than about 10% in a wavelength range from about 350 nm to 400 nm. In some cases, the wavelength separation distance between the non-overlapping first and second wavelength ranges may be at least 5 nm, or at least 10 nm, or at least 15 nm, or at least 20 nm. In some cases, the LCF  600  has a viewing angle  2 θv of less than about 40 degrees for at least one wavelength in the second wavelength range. In this example, when sun light  690  is incident on the front surface of the LCF  600 , the second material  642  of the second region  640  absorbs or/and reflects at least a part of light incident having wavelengths in a range from about 350 nm to 400 nm (the ultraviolet light range) substantially independent of the incidence angle of the light  690 . The second region  640  is sufficiently absorbing or/and reflecting light such that the transmission of the ultraviolet light passing through the second region  640  and exiting the LCF  600  is uniform and desirably, less than about 10% and substantially independent of the incidence angle of the light. In some cases, in order to achieve the transmission of the ultraviolet light passing through the second region  640  and exiting the LCF  600  than about 10%, thickness or size of the second materials  642  may be increased, or the second region  640  may include multiple layers of the second materials  642 , or the multiple layers of the second materials  642  may be provided on at least one of the first surface  610  and second surface  620 , or either the first or second surfaces  610 ,  620  may include multiple layers of the second materials  642 , or the concentration of the second materials  642  may be increased. In some cases, the transmission in the ultraviolet light range may be less than 10% by providing scattering particles in and/or on the optical film  650 . At the same time, the second region  640  has an average optical transmittance of greater than about 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90% in each of the range from about 400 nm to about 700 nm and from about 700 nm to about 1200 nm. The transmission of the infrared light (from about 700 nm to about 1200 nm) by the first regions  630  vary as a function of the incidence angle of the light. In particular, when the sun light  690  is incident perpendicularly to the LCF  600 , the infrared light and the visible light may both be transmitted through the optical film  650 . However, as the incidence angle of the light from the sun  690  increases, the amount of the infrared light transmitted through the LCF  600  decreases until the incidence angle reaches the viewing angle  2 θv from which point on substantially all the infrared light is blocked by the first material  632 . At the same time, first regions  630  transmit substantially all light in the visible light range. Therefore, in the exemplary optical communication system of  FIG.  6   , substantially all visible light may be transmitted by the LCF  600 , but the ultraviolet light range may not be transmitted by the LCF  600  or only a restricted amount of the ultraviolet light range, desirably less than about 10% of the ultraviolet wavelength range, may be transmitted by the LCF  600 . And regarding the infrared light range of the sun light  690 , the transmission of the infrared light passing through the LCF  600  is a function of the incidence angle. That is, during the morning hours when the infrared portion of the sun light  690  is relatively small and the sun light  690  is incident on the window at normal incidence angle, most of the infrared light may be transmitted by the LCF  600 . On the other hand, close to noon, when the infrared portion of the sun light  690  is relatively large and the incident angle of the sun light  690  is increased close to or beyond the viewing angle  2 θv of the LCF  600 , very little of the incident infrared light is transmitted by the LCF  600  and finally blocked so that the viewer or resident  677  inside of the building or house  670  may not be exposed to the hot infrared light. And also, the LCF  600  may prevent household items from being damaged due to exposure to the ultraviolet light of the sun light  690  regardless of the incidence angle and, at the same time, the viewer or resident  677  may not become hot from exposure to the infrared light, while the visible light may be transmitted through the LCF  600  such that the sun light  690  may effectively be used to provide lighting to the enclosure  670 . 
     In some embodiments, as shown in  FIG.  2   , an LCF  200  includes a plurality of spaced apart first regions  230  and a second region  240 . Each first region  230  may have a width W and a height H and an aspect ratio H/W that is at least 1 (H/W≥1) or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. Each first region  230  may have a substantially low transmission in a predetermined first wavelength range and a substantially high transmission in a predetermined non-overlapping second wavelength range. Each second region  240  may have substantially low transmission in each of the predetermined first and second wavelength ranges. 
     In other cases, as shown in  FIG.  2   , an LCF  200  includes a plurality of spaced apart first regions  230  and a second region  240 . Each first region  230  may have a width W and a height H and an aspect ratio H/W that is at least 1 (H/W≥1) or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. Each first region  230  may have a substantially high transmission in a predetermined first wavelength range and a substantially low transmission in a predetermined non-overlapping second wavelength range. The second region  240  may have substantially low transmission in each of the predetermined first and second wavelength ranges. 
     In some cases, as shown in  FIG.  2   , an LCF  200  includes a plurality of spaced apart first regions  230  and a second region  240 . Each first region  230  may have a width W and a height H and an aspect ratio H/W that is at least 1 (H/W≥1) or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. Each first region  230  may have a substantially low transmission in a predetermined first wavelength range and a substantially high transmission in a predetermined non-overlapping second wavelength range. The second region  240  may have substantially high transmission in each of the predetermined first and second wavelength ranges. 
     In further examples as shown in  FIG.  7   , each first region of a disclosed LCF may have a substantially high transmission in a predetermined first wavelength range “A”, a substantially low transmission in a predetermined second wavelength range “B”, and a substantially high transmission in a predetermined third wavelength range “C”, where the second wavelength range B is disposed between the first and third wavelength ranges A and, respectively. In some cases, the second wavelength range B is about 20 nm wide from a first wavelength  712  to a second wavelength  714  and centered on a laser visible emission wavelength, the first wavelength range A is from about 400 nm to about the first wavelength  712 , and the third wavelength range C is from about the second wavelength  714  to about 1400 nm. The laser visible emission wavelength may be at least one of 442 nm, 458 nm, 488 nm, 514 nm, 632.8 nm, 980 nm, 1047 nm, 1064 nm, and 1152 nm. In other examples, the laser visible emission wavelength is in a range from about 416 nm to about 1360. In further examples, the LCF further may include a plurality of spaced apart second regions alternating with the plurality of first regions and each second region may have a substantially high transmission in each of the predetermined first, second and third wavelength ranges. In other example, each second region may have a substantially low transmission in either/both the predetermined first or/and third wavelength ranges. In some cases, the LCF has a viewing angle  2 θv of less than about 60 degrees, or 50 degrees, or 40 degrees, or 30 degrees, or 20 degrees in the predetermined second wavelength range. 
     In another exemplary application, the LCFs disclosed herein may be a part of an optical communication system with a separate light source such as laser light source as shown in  FIG.  8   . In particular,  FIG.  8    shows an exemplary application where a LCF is applied to a plane or an aircraft laser strike defense system to block an incoming or incident light in a predetermined wavelength range. An LCF  800  may be attached to, for example, a plane, an airplane or aircraft  870 , etc. and desirably, attached to a surface (such as a window) of the plane, airplane or aircraft  870 . The LCF  800  includes an optical film  850  that includes a plurality of spaced apart first regions  830  and a second region  840  adjacent at least a portion of at least one of the first regions  830 . The first regions  830  may be filled at least partially with a first material  832  and the second region  840  includes a second material  842 . The first material  832  or the second material  842  may be any suitable material such that the first material  832  absorbs or/and reflects in at least a part of visible light range that includes the laser light  891  and the second material  842  absorbs or/and reflects in at least a part of at least one of ultraviolet light and infrared light ranges that include the laser light  891 . More desirably, the second material  842  may absorb or/and reflect in both ultraviolet and infrared wavelength ranges in this example. When laser light  891  is incident on the LCF  800 , the second material  842  of the second region  840  absorbs or/and reflects at least a part of ultraviolet light and infrared wavelength ranges regardless of the incidence angle of the light  891 . Furthermore, the second region  840  transmits in a range of the visible wavelengths that include the laser light  891  wavelength, but the transmission of the visible light through the first regions  830  vary as a function of an incidence angle of the light. When the light is incident perpendicularly to the surface of the LCF  800 , the visible light can be transmitted through the optical film  850 . However, outside viewing angle,  2 θv (refer to  FIG.  2   ), the visible light is blocked by the first material  832  in the first regions  830 . Therefore, when using the LCF  800  on the plane or aircraft  870 , the visible light from the laser light  891  within the viewing angle  2 θv can be transmitted by the LCF  800  but the ultraviolet light and the infrared light from the laser light  891  may not be transmitted by the LCF  800  or only a restricted amount of the ultraviolet light and infrared light, desirably less than about 10% the ultraviolet light and infrared light respectively may be transmitted by the LCF  800 . And for the visible light, it can be transmitted by the LCF  800  as a function of an incidence angle and a wavelength of the light. Laser striker  878  may attack the plane or aircraft  870 , for example, using a green laser  890  in order to obstruct a view of a pilot  877 . Normally, the wavelength of the green color is about from 495 nm to 570 nm. Therefore, the LCF  800  with the first material  832  that absorbs or/and reflects the range of the wavelength from 495 nm to 570 nm of the light, so that the pilot  877  on the plane or aircraft  870  is not affected by the green laser attack from the laser striker  878  on the ground. 
       FIG.  9    is a plot of transmission vs. wavelength for the exemplary disclosed optical films that may be useful in forming light control films. In some embodiments, an LCF includes a plurality of first and second regions, such that for light incident normally to a plane of the LCF, an average optical transmittance of the LCF may be less than about 10% in a predetermined first wavelength range having shorter wavelengths, and an average optical transmittance of the LCF may be greater than about 50% in a predetermined second wavelength range having longer wavelengths. And for light incident at or greater than about 30 degrees from the plane of the LCF, an average optical transmittance of the LCF may be less than about 20% in each of the predetermined first and second wavelength ranges. In exemplary cases, the predetermined first wavelength range may be from about 400 nm to about 650 nm, and the predetermined second wavelength range may be from about 750 nm to about 1500 nm. In some cases, the second region includes a plurality of spaced apart second region segments alternating with the plurality of first regions. In some cases, the light control film includes a major microstructured first surface having a plurality of alternating ribs and channels, where each channel is at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. In some cases, the second region includes a plurality of second region segments, and each rib includes one of the second region segments. In some cases, the second region is disposed on a major surface of the light control film and extend across and cover at least some of the first regions. In some cases, the average optical transmittance of the first regions in the predetermined second wavelength range is less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 1%. In some cases, the average optical transmittance of the second region in the predetermined first wavelength range is less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 1%. In some cases, the average optical transmittance of the second region in the predetermined second wavelength range is greater than about 40%, or greater than about 50%, or greater than about 60%, or greater than about 70%, or greater than about 80%, or greater than about 90%. In some cases, for light incident normally to the plane of the light control film, the average optical transmittance of the light control film is less than about 5%, or less than about 1%, in the predetermined first wavelength range. In some cases, for light incident normally to the plane of the light control film, the average optical transmittance of the light control film is greater than about 55%, or 60%, in the predetermined second wavelength range. 
     Furthermore, as shown in  FIG.  9   , an LCF includes a plurality of first and second regions, such that plot  910  is the optical transmission of the LCF for normally incident light, plot  920  is the optical transmission of the LCF for 30 degree incident light, and plot  930  is the optical transmission of the LCF for 60 degree incident light, where all three plots are shown as a function of the wavelength of the incident light. Hence, the average optical transmission of the LCF is less than about 10%, or less than about 7%, or less than about 5% for all angles of incidence for wavelengths from about 400 nm to about 620 nm, or 610 nm, or 600 nm. Furthermore, for the wavelength range from about 700 nm, or about 710 nm, or about 720 nm to about 1500 nm, the average optical transmission of the LCF changes from about 60% to about 5% when the angle of incidence changes from zero degree to about 30 degrees, and the average optical transmission of the LCF changes from about 60% to about 2%, or about 1% when the angle of incidence changes from zero degree to about 60 degrees. Hence, when an angle of incidence of light incident on the LCF changes from about 90 degrees to about 60 degrees relative to the plane of the LCF (or, about zero degree to about 30 degrees from a line normal to the plane of the LCF), an average optical transmittance of the LCF may change by less than about 10% in a predetermined first wavelength range having shorter wavelengths and greater than about 40% in a predetermined second wavelength range having longer wavelengths. In some cases, the average optical transmittance of the first regions in the predetermined second wavelength range is less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 1%. In some cases, the average optical transmittance of the second region in the predetermined first wavelength range is less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 1%. In some cases, the average optical transmittance of the second region in the predetermined second wavelength range is greater than about 40%, or greater than about 50%, or greater than about 60%, or greater than about 70%, or greater than about 80%, or greater than about 90%. In some cases, when the angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to the plane of the light control film, the average optical transmittance of the light control film changes by less than about 5%, in the predetermined first wavelength range. In some cases, when the angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to the plane of the light control film, the average optical transmittance of the light control film changes by less than about 1% in the predetermined first wavelength range. In some cases, when the angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to the plane of the light control film, the average optical transmittance of the light control film changes by greater than about 55%, or 60%, in the predetermined second wavelength range. The disclosed light control films (LCFs) may advantageously be utilized in various applications. For example, in some cases, the disclosed LCFs may improve angular uniformity of the spectral profile of a light source. For example,  FIG.  10    illustrates a light source system  1001  for improving the emission spectral profile of a light source along different emission directions. In particular,  FIG.  10    shows a light source  1200  that is configured to emit light having different spectral profiles along different directions. For example, referring  FIGS.  10 A ,  10 B and  10 C, light source  1200  emits light having a first spectral profile  1210  along a first direction  1220  and a second spectral profile  1230  along a different second direction  1240 . In the exemplary light source system  1001 , first direction  1220  is normal to the plane of the light source. In general, the first and second directions may be any two directions along which the emitted light may have different spectral profiles. The light source system  1001  further includes a LCF (LCF)  1000  disposed on light source  1200  for improving the angular spectral profile uniformity of the light source. LCF  1000  receives light emitted by light source  1200  and transmits the received light. LCF  1000  may be any LCF disclosed herein. For example, LCF  1000  includes a plurality of spaced apart first regions  1030 . Each first region has a width W and a height H, where, in some cases, H/W≥1, or H/W≥2, or H/W≥5, or H/W≥10, or H/W≥20. In general, the orientation and absorbing properties of the first regions  1030  are at least some of the factors that improve the angular spectral profile uniformity of light transmitted by the LCF  1000 . Other factors may include, for example, the viewing angle  2 θv of the LCF which may depend on, for example, the pitch of the first regions  1030  and the ratio H/W. In some cases, first regions  1030  are oriented relative to first direction  1220  and second direction  1240  and the spectral absorbance profile  1320  (refer to  FIG.  10 C ) of the first regions  1030  is so that when light that is emitted by the light source  1200  is transmitted by the LCF  1000 , the transmitted light has a third spectral profile  1260  along the first direction  1220  and a fourth spectral profile  1270  along the second direction  1240 , where the difference between the third and fourth spectral profiles  1260  and  1270  is less than the difference between the first and second spectral profiles  1210  and  1230 . For example, in some cases, the difference between the third and fourth spectral profiles  1260  and  1270  is at least 5%, or at least 10%, or at least 15%, or at least 20%, or at least 30%, or at least 40%, or at least 50% less than the difference between the first and second spectral profiles  1210  and  1230 . In some cases, such as when first direction  1220  is perpendicular to the plane of light source  1200 , the spectral profile of light incident on the LCF  1000  along the first direction  1220  may remain unchanged upon transmission by the LCF. In such cases, first spectral profile  1210  may be substantially equal to third spectral profile  1260 . Furthermore, the first regions  1030  may selectively absorb light propagating along second direction  1240  so that spectral profile  1230  changes upon transmission to spectral profile  1270  more closely matching third spectral profile  1260 . In some cases, LCF  1000  improves the angular spectral profile uniformity of light source  1200  by each first region  1030  selectively absorbing light within each of the first and second spectral profiles  1210  and  1230 . For example, in cases, where neither first nor second direction  1220 ,  1240  is perpendicular to the plane of light source  1200  or LCF  1000 , each first regions  1030  may selectively absorb light within each of the first and second spectral profiles  1210  and  1230 . In some cases, second direction  1240  makes an angle α with a line  1222  that is normal to the plane of light source  1200 . In some cases, angle α is greater than θv where  2 θv is the viewing angle of LCF  1000 . In such cases, at least a majority of light rays emitted by light source  1200  along first direction  1220  pass through first regions  1030  and, as a result, may be selectively absorbed. Such selective absorption may improve the angular color uniformity of the light source  1200 . In some cases, light emitted from the light source  1200  and propagating along first direction  1220  has a first set of color coordinates, and light propagating along second direction  1240  has a second set of color coordinates, wherein light transmitted by LCF  1000  and propagating along the first direction  1220  has a third set of color coordinates and propagating along the second direction  1240  has a fourth set of color coordinates, where the difference between the third and fourth sets of color coordinates is less than the difference between the first and second sets of color coordinates. For example, in some cases, the first set of color coordinates are u 1 ′ and v 1 ′, the second set of color coordinates are u 2 ′ and v 2 ′, the third set of color coordinates are u 3 ′ and v 3 ′, and the fourth set of color coordinates are u 4 ′ and v 4 ′. In such cases, the absolute value of each of (u 4 ′−u 3 ′) and (v 4 ′−v 3 ′) may be less than 5%, or less than 10%, or less than 15%, or less than 20%, or less than 30%, or less than 40%, or less than 50% of each of the corresponding (u 1 ′−u 2 ′) and (v 1 ′−v 2 ′). 
     In some cases, the disclosed light control films (LCFs) may be utilized in combination with retroreflectors. For example,  FIG.  11    shows a retroreflective system  1101  that includes a retroreflective sheet  1190  for retroreflecting light, and a LCF  1100  disposed on the retroreflective sheet  1190 . In general, retroreflector sheet  1190  is configured to retroreflect light for a range of incident wavelengths and angles. For example, retroreflector sheet  1190  may be configured to retroreflect light for different incident wavelengths λ 1  and λ 2  and different incident angles α and α′. The addition of LCF  1100  results in system  1101  having modified retroreflective properties. For example, for a larger angle α and a smaller angle α′, the viewing angle  2 θv of LCF  1100  may be such that for the smaller incident angle α′, LCF  1100  substantially transmits light at both wavelengths λ 1  and λ 2 , but for the larger incident angle α, LCF may substantially transmit light having wavelength λ 1  and substantially absorb light having wavelength λ 2 . For example, in some cases, the viewing angle  2 θv of LCF  1100  may be greater than α′ and less than α. As another example, retroreflective system  1101  is so configured that for a first wavelength λ 1 , lights  810  and  810 ′ incident on LCF  1100  at corresponding first and second angles of incidence α′ and α, are both retroreflected as respective retroreflected lights  812  and  812 ′. Furthermore, for a second wavelength λ 2 , light  820  incident on the LCF at the first incidence angle α′ is retroreflected at retroreflected light  822 , but light  820 ′ incident on the LCF at the second incidence angle α is not retroreflected. In such cases, light  820 ′ is absorbed by LCF  1100  when it is first incident on the LCF and, in some cases, after it is partially transmitted by the LCF and retroreflected by the retroreflective sheet. In some cases, LCF  1100  includes a larger first viewing angle for the first wavelength and a smaller viewing angle for the second wavelength. In some cases, the first angle of incidence α′ is substantially equal to zero relative to a line  801  normal to a plane of the LCF  1100 . In some cases, retroreflective sheet  1190  includes microsphere beads  610  for retroreflecting light. In some cases, retroreflective sheet  1190  includes corner cubes  620  for retroreflecting light. In some cases, LCF  1100  includes a plurality of spaced apart first regions  1130 , where each first region  1130  has a substantially low transmission at the second wavelength λ 2 , but not at the first wavelength λ 1 . 
     In some cases, the light control film (LCF) may be used as part of an optical communication system having a sensor, more specifically, an IR sensor in order to improve signal to noise performance and enable improved directional sensing. In this example, the first material is spectrally selective in at least a part of infrared light range and in some cases, the second material may be spectrally selective in at least a part of at least one of ultraviolet light and visible light ranges. More desirably, the second material is spectrally selective in both r ultraviolet light and visible light ranges. When using the LCF, noises like ultraviolet light and visible light from the IR sensor are absorbed through the second material regardless of the incidence angle of light. The transmission of the ultraviolet light and visible light from a light source passing through the second region is uniform and desirably, less than about 10% regardless of the incidence angle of the light. However, the second region may transmit a range of the infrared light from light source but the transmission of the infrared light through the first regions vary as a function of an incidence angle of the light. When light is incident perpendicularly to the surface of the LCF, the infrared light may be transmitted through the optical film. However, outside the viewing angle,  2 θv, the infrared light is blocked by the first material in the first regions. Therefore, the disclosed system provides an IR sensor with substantially reduced noise and substantially improved directional sensing. 
     In another case, the LCF can be used in a part of an optical communication system with a sensor, more specifically a pulse sensor applied to a wrist watch as shown in  FIG.  12   . In particular,  FIG.  12    shows an exemplary application of an LCF applied to a wrist watch with a pulse sensor. An LCF  1200  may be attached to a wearable wrist watch  1280  or any wearable device and desirably, attached to a surface of the wearable watch  1280 . The LCF  1200  includes an optical film  1250  that includes a plurality of first regions  1230  and a second region  1240  adjacent at least a portion of a least one first regions  1230 . The first regions  1230  may be filled at least partially with a first material  1232  and the second region  1240  may include a second material  1242 . The first material  1232  or the second material  1242  may be any suitable material such that the first material  1232  is spectrally selective in at least a part of visible light range from the light source, for example, LED  1290  and the second material  1242  is spectrally selective in at least a part of at least one of ultraviolet light and infrared light ranges from the LED  1209 . More desirably, the second material  1242  is spectrally selective in both ranges in the ultraviolet light and infrared light ranges. When using the LCF  1200 , noises like ultraviolet light and infrared light from the perspective of a pulse sensor  1285  are absorbed through the second material  1242  regardless of the incidence angle of the light from light source such as sun light  1295  or LED  1290 . The transmission of the ultraviolet light and infrared light from the light source passing through the second region  1240  is uniform and desirably, less than about 10%, regardless of the incidence angle of the light. However, the second region  1240  transmits a range of the visible light from LED  1290  but the transmission of the visible light through the first regions  1230  varies as a function of the incidence angle of the light. When the light from LED  1290  is incident perpendicularly on the surface of the LCF  1200 , the visible light may be transmitted through the optical film  1250 . However, the first material  1232  may block or decrease the sun light  1295  or ambient visible light from other light sources that are incident with relatively high incidence angle to the wrist  777  of the person wearing the device so that the LCF  1200  may improve signal (mainly visible light from LED that is incident within a viewing angle) to noise (for example, ultraviolet light or infrared light or ambient visible light from, for example, sunlight, other ambient light source that is incident outside viewing angle) ratio. In some cases, the sensor may be a sensor in a camera or camera system. In some cases, a camera includes the sensor. 
     The following is a list of exemplary embodiments of the present description. 
     Embodiment 1 is a light control film that includes a plurality of spaced apart first regions, each first region having a substantially low transmission in one or two of a first wavelength range from about 300 nm to about 400 nm, a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 nm to about 1200 nm, and a substantially high transmission in remaining wavelength ranges, wherein the light control film includes a first viewing angle of less than about 70 degrees along a predetermined first direction. 
     Embodiment 2 is the light control film of Embodiment 1 having a second viewing angle of less than about 70 degrees along an orthogonal predetermined second direction different from the first viewing angle. 
     Embodiment 3 is the light control film of Embodiment 1 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 4 is the light control film of Embodiment 3, wherein each rib has a substantially high transmission in each wavelength range the first regions have a substantially low transmission in. 
     Embodiment 5 is the light control film of Embodiment 3, wherein each rib has a substantially low transmission in at least one wavelength range the first regions have a substantially high transmission in. 
     Embodiment 6 is the light control film of Embodiment 1 further including a plurality of second regions alternating with the plurality of first regions, each second region having a substantially high transmission in each wavelength range the first regions have a substantially low transmission in. 
     Embodiment 7 is the light control film of Embodiment 1 further including a plurality of second regions alternating with the plurality of first regions, each second region having a substantially low transmission in at least one wavelength range the first regions have a substantially high transmission in. 
     Embodiment 8 is the light control film of Embodiment 6 or 7, wherein each second region is disposed on a major surface of the light control film. 
     Embodiment 9 is the light control film of Embodiment 1 further including a second region extending across and covering at least some of the first regions, the second region having a substantially low transmission in at most one, but not all, wavelength regions the first regions have a substantially high transmission in. 
     Embodiment 10 is the light control film of Embodiment 1, wherein the first wavelength range is from about 350 nm to about 400 nm. 
     Embodiment 11 is the light control film of Embodiment 1, wherein the first wavelength range is from about 350 nm to about 380 nm. 
     Embodiment 12 is the light control film of Embodiment 1, wherein the second wavelength range is from about 400 nm to about 460 nm. 
     Embodiment 13 is the light control film of Embodiment 1, wherein the second wavelength range is from about 470 nm to about 550 nm. 
     Embodiment 14 is the light control film of Embodiment 1, wherein the third wavelength range is from about 800 nm to about 1000 nm. 
     Embodiment 15 is the light control film of Embodiment 1, wherein the third wavelength range is from about 820 nm to about 1200 nm. 
     Embodiment 16 is the light control film of Embodiment 1, wherein the third wavelength range is from about 885 nm to about 1200 nm. 
     Embodiment 17 is the light control film of Embodiment 1, wherein the third wavelength range is from about 920 nm to about 1200 nm. 
     Embodiment 18 is a light control film that includes a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material, each channel including a width W and a height H, H/W≥1, each rib having a second material, wherein an absorption of at least one of the first and second materials varies as a function of wavelength in a range from about 300 nm to about 1200. 
     Embodiment 19 is the light control film of Embodiment 18, wherein the absorption of each of the first and second materials varies as a function of wavelength in a range from about 400 nm to about 1200. 
     Embodiment 20 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a substantially low transmission in a first wavelength range from about 700 nm to about 1200 nm, the second region having a substantially low transmission in a second wavelength range from about 300 nm to about 400 nm. 
     Embodiment 21 is the light control film of Embodiment 20 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 22 is the light control film of Embodiment 21, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 23 is the light control film of Embodiment 20, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 24 is the light control film of Embodiment 20, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 25 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a substantially low transmission in at least one of a first wavelength range from about 300 nm to about 400 nm, a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 to about 1200 nm, the second region having a substantially low transmission in at least one of the at least one of the three wavelength ranges each first region has substantially low transmission in. 
     Embodiment 26 is the light control film of Embodiment 25, wherein each first region and the second region have substantially low transmission in a same two of the three wavelength ranges. 
     Embodiment 27 is the light control film of Embodiment 25 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 28 is the light control film of Embodiment 27, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 29 is the light control film of Embodiment 25, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 30 is the light control film of Embodiment 25, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 31 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a substantially high transmission in a first wavelength range from about 300 nm to about 400 nm and a substantially low transmission in a second wavelength range from about 400 nm to about 700 nm, the second region having a substantially high transmission in each of the first and second wavelength regions. 
     Embodiment 32 is the light control film of Embodiment 31 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 33 is the light control film of Embodiment 32, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 34 is the light control film of Embodiment 31, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 35 is the light control film of Embodiment 31, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 36 is the light control film of Embodiment 31, wherein each first region and the second region have substantially high transmissions in a third wavelength range from about 700 nm to about 1200 nm. 
     Embodiment 37 is the light control film of Embodiment 31, wherein each first region has a substantially low transmission region in a third wavelength range from about 700 nm to about 1200 nm, and the second region has a substantially high transmission region in the third wavelength range. 
     Embodiment 38 is a detector system, including: 
     a detector sensitive to wavelengths in a detection wavelength range; and 
     a light control film disposed on the detector and including a plurality of alternating first and second regions, each first region having a width W and a height H, H/W≥1, each first region having a substantially low transmission in a first portion of the detection wavelength range and a substantially high transmission in a remaining portion of the detection wavelength range, each second region having a substantially high transmission in the detection wavelength range. 
     Embodiment 39 is the detector system of Embodiment 38, wherein the detection wavelength range is from about 800 to about 1600 and the first portion of the detection wavelength range is from about 900 nm to about 1100 nm. 
     Embodiment 40 is the detector system of Embodiment 38, wherein a viewing angle of the light control film in the first portion of the detection wavelength range is less than about 70 degrees along a first direction. 
     Embodiment 41 is the detector system of Embodiment 38, wherein the light control film includes a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions, each rib including a second material and forming one of the second regions. 
     Embodiment 42 is the detector system of Embodiment 38, wherein H/W≥5. 
     Embodiment 43 is the detector system of Embodiment 38, wherein H/W≥10. 
     Embodiment 44 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a width W and a height H, H/W≥1, each first region having substantially low transmissions in each of non-overlapping predetermined first and second wavelength ranges, the second region having a substantially low transmission in the predetermined second wavelength range. 
     Embodiment 45 is the light control film of Embodiment 44, wherein the predetermined first wavelength range includes shorter wavelengths and the predetermined second wavelength range includes longer wavelengths. 
     Embodiment 46 is the light control film of Embodiment 44, wherein the predetermined first wavelength range is from about 400 nm to about 700 nm. 
     Embodiment 47 is the light control film of Embodiment 44, wherein the predetermined second wavelength range is from about 700 nm to about 1200 nm. 
     Embodiment 48 is the light control film of Embodiment 44, wherein an average optical transmittance of each first region in the predetermined first wavelength range is less than about 25, or 15%, or 10%, or 5%, or 1%, or 0.1%, or 0.01%, or 0.001, or 0.0001%. 
     Embodiment 49 is the light control film of Embodiment 44, wherein an average optical transmittance of each first region in the predetermined second wavelength range is less than about 25, or 15%, or 10%%, or 5%, or 1%, or 0.1%, or 0.01%, or 0.001, or 0.0001. 
     Embodiment 50 is the light control film of Embodiment 44, wherein an average optical transmittance of the second region in the predetermined second wavelength range is less than about 25, or 15%, or 10%%, or 5%, or 1%, or 0.1%, or 0.01%, or 0.001, or 0.0001. 
     Embodiment 51 is the light control film of Embodiment 44, wherein each first region has a substantially high absorption in the predetermined first wavelength range. 
     Embodiment 52 is the light control film of Embodiment 44, wherein an average optical absorption of each first region in the predetermined second wavelength range is greater than about 70%, or 80%, or 90%, or 95%, or 99%. 
     Embodiment 53 is the light control film of Embodiment 44, wherein each first region has a substantially high reflectance in the predetermined first wavelength range. 
     Embodiment 54 is the light control film of Embodiment 44, wherein an average optical reflectance of each first region in the predetermined second wavelength range is greater than about 70%, or 80%, or 90%, or 95%, or 99%. 
     Embodiment 55 is the light control film of Embodiment 44, wherein each first region has a first index of refraction, and the second region has a second index of refraction, a difference between the first and second indices of refraction being less than about 0.01 
     Embodiment 56 is the light control film of Embodiment 44, wherein the second region has a substantially low transmission in the predetermined first wavelength range. 
     Embodiment 57 is the light control film of Embodiment 44, wherein an average optical transmittance of the second region in the predetermined second wavelength range is less than about 10%. 
     Embodiment 58 is the light control film of Embodiment 44, wherein the second region has a substantially high transmission in the predetermined first wavelength range. 
     Embodiment 59 is the light control film of Embodiment 44, wherein an average optical transmittance of the second region in the predetermined first wavelength range is greater than about 70%. 
     Embodiment 60 is the light control film of Embodiment 44, wherein the second region includes a plurality of segments alternating with the plurality of first regions. 
     Embodiment 61 is the light control film of Embodiment 44, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 62 is the light control film of Embodiment 44, wherein the second region is discontinuous. 
     Embodiment 63 is the light control film of Embodiment 44 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 64 is the light control film of Embodiment 63, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 65 is the light control film of Embodiment 44, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 66 is the light control film of Embodiment 44, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 67 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a width W and a height H, H/W≥1, each first region having substantially low transmissions in each of non-overlapping predetermined first and second wavelength ranges, the second region having substantially high transmission in the predetermined second wavelength range. 
     Embodiment 68 is the light control film of Embodiment 67, wherein the predetermined first wavelength range includes shorter wavelengths and the predetermined second wavelength range includes longer wavelengths. 
     Embodiment 69 is the light control film of Embodiment 67, wherein the predetermined first wavelength range is from about 400 nm to about 700 nm. 
     Embodiment 70 is the light control film of Embodiment 67, wherein the predetermined second wavelength range is from about 700 nm to about 1200 nm. 
     Embodiment 71 is the light control film of Embodiment 67, wherein an average optical transmittance of each first region in the predetermined first wavelength range is less than about 10%. 
     Embodiment 72 is the light control film of Embodiment 67, wherein an average optical transmittance of each first region in the predetermined second wavelength range is less than about 10%. 
     Embodiment 73 is the light control film of Embodiment 67, wherein an average optical transmittance of the second region in the predetermined second wavelength range is greater than about 70%. 
     Embodiment 74 is the light control film of Embodiment 67, wherein the second region has a substantially low transmission in the predetermined first wavelength range. 
     Embodiment 75 is the light control film of Embodiment 67, wherein an average optical transmittance of the second region in the predetermined first wavelength range is less than about 10%. 
     Embodiment 76 is the light control film of Embodiment 67, wherein the second region has a substantially high transmission in the predetermined first wavelength range. 
     Embodiment 77 is the light control film of Embodiment 67, wherein an average optical transmittance of the second region in the predetermined first wavelength range is greater than about 70%. 
     Embodiment 78 is the light control film of Embodiment 67 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 79 is the light control film of Embodiment 78, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 80 is the light control film of Embodiment 67, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 81 is the light control film of Embodiment 67, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 82 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a width W and a height H, H/W≥1, each first region having a substantially high transmission in a predetermined first wavelength range and a substantially low transmission in a predetermined non-overlapping second wavelength range, the second region having substantially high transmission in each of the predetermined first and second wavelength ranges. 
     Embodiment 83 is the light control film of Embodiment 82 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 84 is the light control film of Embodiment 83, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 85 is the light control film of Embodiment 82, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 86 is the light control film of Embodiment 82, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 87 is the light control film of Embodiment 82, wherein the first wavelength range is about 400 nm to about 700 nm. 
     Embodiment 88 is the light control film of Embodiment 82, wherein the first wavelength range is about 400 nm to about 460 nm. 
     Embodiment 89 is the light control film of Embodiment 82, wherein the first wavelength range is about 600 nm to about 650 nm. 
     Embodiment 90 is the light control film of Embodiment 82, wherein the first wavelength range is about 470 nm to about 550 nm. 
     Embodiment 91 is the light control film of Embodiment 82, wherein a wavelength separation distance between the non-overlapping first and second wavelength ranges is at least 5 nm, or at least 10 nm, or at least 15 nm, or at least 20 nm. 
     Embodiment 92 is an optical construction including the light control film of Embodiment 82 disposed on a window substrate, each first region having an average optical transmittance of greater than about 50%, or 60%, or 70%, or 80%, or 90% in a first wavelength range from about 400 nm to about 700 nm and an average optical transmittance of less than about 10% in a non-overlapping second wavelength range from about 700 nm to about 1200 nm, the second region having an average optical transmittance of greater than about 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90% in each of the predetermined first and second wavelength ranges, wherein the light control film has a viewing angle of less than about 40 degrees for at least one wavelength in the second wavelength range. 
     Embodiment 93 is the optical construction of Embodiment 92, wherein the window substrate has an average optical transmittance of greater than about 50%, or 60%, or 70%, or 80%, or 90% in the predetermined first and second wavelength ranges. 
     Embodiment 94 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a width W and a height H, H/W≥1, each first region having a substantially low transmission in a predetermined first wavelength range and a substantially high transmission in a predetermined non-overlapping second wavelength range, each second region having substantially low transmission in each of the predetermined first and second wavelength ranges. 
     Embodiment 95 is the light control film of Embodiment 94 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 96 is the light control film of Embodiment 95, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 97 is the light control film of Embodiment 94, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 98 is the light control film of Embodiment 94, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 99 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a width W and a height H, H/W≥1, each first region having a substantially high transmission in a predetermined first wavelength range and a substantially low transmission in a predetermined non-overlapping second wavelength range, the second region having substantially low transmission in each of the predetermined first and second wavelength ranges. 
     Embodiment 100 is the light control film of Embodiment 99 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 101 is the light control film of Embodiment 100, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 102 is the light control film of Embodiment 99, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 103 is the light control film of Embodiment 99, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 104 is a light control film including a plurality of spaced apart first regions and a second region, each first region having a width W and a height H, H/W≥1, each first region having a substantially low transmission in a predetermined first wavelength range and a substantially high transmission in a predetermined non-overlapping second wavelength range, the second region having substantially high transmission in each of the predetermined first and second wavelength ranges. 
     Embodiment 105 is the light control film of Embodiment 104 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 106 is the light control film of Embodiment 105, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 107 is the light control film of Embodiment 104, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 108 is the light control film of Embodiment 104, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 109 is a light control film configured to block light in a predetermined wavelength range, including a plurality of spaced apart first regions, each first region having a width W and a height H, H/W≥1, each first region having a substantially high transmission in a predetermined first wavelength range, a substantially low transmission in a predetermined second wavelength range, and a substantially high transmission in a predetermined third wavelength range, the second wavelength range disposed between the first and third wavelength ranges 
     Embodiment 110 is the light control film of Embodiment 109, wherein the second wavelength range is about 20 nm wide from a first wavelength to a second wavelength and centered on a laser visible emission wavelength, the first wavelength range is from about 400 nm to about the first wavelength, and the third wavelength range is from about the second wavelength to about 1400 nm. 
     Embodiment 111 is the light control film of Embodiment 110, wherein the laser visible emission wavelength is at least one of 442 nm, 458 nm, 488 nm, 514 nm, 632.8 nm, 980 nm, 1047 nm, 1064 nm, and 1152 nm. 
     Embodiment 112 is the light control film of Embodiment 110, wherein the laser visible emission wavelength is in a range from about 416 nm to about 1360. 
     Embodiment 113 is the light control film of Embodiment 109 further including a plurality of spaced apart second regions alternating with the plurality of first regions, each second region having a substantially high transmission in each of the predetermined first, second and third wavelength ranges. 
     Embodiment 114 is the light control film of Embodiment 109 having a viewing angle of less than about 60 degrees, or 50 degrees, or 40 degrees, or 30 degrees, or 20 degrees in the predetermined second wavelength range. 
     Embodiment 115 is a light control film including a plurality of spaced apart first regions and a second region, such that for light incident normally to a plane of the light control film: 
     an average optical transmittance of the light control film is less than about 10% in a predetermined first wavelength range having shorter wavelengths; and 
     an average optical transmittance of the light control film is greater than about 50% in a predetermined second wavelength range having longer wavelengths; and 
     for light incident at or greater than about 30 degrees from the plane of the light control film: 
     an average optical transmittance of the light control film is less than about 20% in each of the predetermined first and second wavelength ranges. 
     Embodiment 116 is the light control film of Embodiment 115, wherein the predetermined first wavelength range is from about 400 nm to about 650 nm, and the predetermined second wavelength range is from about 750 nm to about 1500 nm. 
     Embodiment 117 is the light control film of Embodiment 115, wherein the second region includes a plurality of spaced apart second region segments alternating with the plurality of first regions. 
     Embodiment 118 is the light control film of Embodiment 115 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 119 is the light control film of Embodiment 118, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 120 is the light control film of Embodiment 115, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 121 is the light control film of Embodiment 115, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 122 is the light control film of Embodiment 115, wherein an average optical transmittance of the first regions in the predetermined second wavelength range is less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 1%. 
     Embodiment 123 is the light control film of Embodiment 115, wherein an average optical transmittance of the second region in the predetermined first wavelength range is less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 1%. 
     Embodiment 124 is the light control film of Embodiment 115, wherein an average optical transmittance of the second region in the predetermined second wavelength range is greater than about 40%, or greater than about 50%, or greater than about 60%, or greater than about 70%, or greater than about 80%, or greater than about 90%. 
     Embodiment 125 is the light control film of Embodiment 115, wherein for light incident normally to the plane of the light control film, the average optical transmittance of the light control film is less than about 5% in the predetermined first wavelength range. 
     Embodiment 126 is the light control film of Embodiment 115, wherein for light incident normally to the plane of the light control film, the average optical transmittance of the light control film is less than about 1% in the predetermined first wavelength range. 
     Embodiment 127 is the light control film of Embodiment 115, wherein for light incident normally to the plane of the light control film, the average optical transmittance of the light control film is greater than about 55% in the predetermined second wavelength range. 
     Embodiment 128 is the light control film of Embodiment 115, wherein for light incident normally to the plane of the light control film, the average optical transmittance of the light control film is greater than about 60% in the predetermined second wavelength range. 
     Embodiment 129 is a light control film including a plurality of spaced apart first regions and a second region, such that when an angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to a plane of the light control film, an average optical transmittance of the light control film changes by: 
     less than about 10% in a predetermined first wavelength range having shorter wavelengths; and 
     greater than about 40% in a predetermined second wavelength range having longer wavelengths. 
     Embodiment 130 is the light control film of Embodiment 129, wherein the predetermined first wavelength range is from about 400 nm to about 650 nm, and the predetermined second wavelength range is from about 750 nm to about 1500 nm. 
     Embodiment 131 is the light control film of Embodiment 129, wherein the second region includes a plurality of spaced apart second region segments alternating with the plurality of first regions. 
     Embodiment 132 is the light control film of Embodiment 129 including a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form one of the first regions in the plurality of spaced apart first regions. 
     Embodiment 133 is the light control film of Embodiment 132, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 134 is the light control film of Embodiment 129, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 135 is the light control film of Embodiment 129, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 136 is the light control film of Embodiment 129, wherein an average optical transmittance of the first regions in the predetermined second wavelength range is less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 1%. 
     Embodiment 137 is the light control film of Embodiment 129, wherein an average optical transmittance of the second region in the predetermined first wavelength range is less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 1%. 
     Embodiment 138 is the light control film of Embodiment 129, wherein an average optical transmittance of the second region in the predetermined second wavelength range is greater than about 40%, or greater than about 50%, or greater than about 60%, or greater than about 70%, or greater than about 80%, or greater than about 90%. 
     Embodiment 139 is the light control film of Embodiment 129, wherein when the angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to the plane of the light control film, the average optical transmittance of the light control film changes by less than about 5% in the predetermined first wavelength range. 
     Embodiment 140 is the light control film of Embodiment 129, wherein when the angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to the plane of the light control film, the average optical transmittance of the light control film changes by less than about 1% in the predetermined first wavelength range. 
     Embodiment 141 is the light control film of Embodiment 129, wherein when the angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to the plane of the light control film, the average optical transmittance of the light control film changes by greater than about 55% in the predetermined second wavelength range. 
     Embodiment 142 is the light control film of Embodiment 129, wherein when the angle of incidence of light incident on the light control film changes from about 90 degrees to about 60 degrees relative to the plane of the light control film, the average optical transmittance of the light control film changes by greater than about 60% in the predetermined second wavelength range. 
     Embodiment 143 is a light control film including: 
     a major microstructured first surface having a plurality of alternating ribs and channels, each channel at least partially filled with a first material to form a first region; and 
     a second region adjacent at least a portion of at least one first region and including a second material; 
     wherein each of the first and second materials absorbs light in one or two of a first wavelength range from about 300 nm to about 400 nm, a second wavelength range from about 400 nm to about 700 nm, and a third wavelength range from about 700 nm to about 1200 nm, and wherein each channel includes a width W and a height H, H/W≥1. 
     Embodiment 144 is the light control film of Embodiment 143, wherein the second region is disposed in or on at least portions of the ribs. 
     Embodiment 145 is the light control film of Embodiment 143, wherein the second region includes a plurality of second region segments, each rib including one of the second region segments. 
     Embodiment 146 is the light control film of Embodiment 143, wherein the second region is disposed on a major surface of the light control film. 
     Embodiment 147 is the light control film of Embodiment 143, wherein the second region extends across and covers at least some of the first regions. 
     Embodiment 148 is a light source system, including: 
     a light source configured to emit light having a first spectral profile along a first direction and a second spectral profile along a different second direction; and 
     a light control film disposed on the light source for receiving and transmitting light emitted by the light source, the light control film including a plurality of spaced apart first regions, each first region having a width W and a height H, H/W≥1, the first regions oriented relative to the first and second directions and having a spectral absorbance profile so that when light emitted by the light source is transmitted by the light control film, the transmitted light has a third spectral profile along the first direction and a fourth spectral profile along the second direction, a difference between the third and fourth spectral profiles being less than a difference between the first and second spectral profiles. 
     Embodiment 149 is the light source system of Embodiment 148, wherein the first direction is substantially perpendicular to a plane of the light control film. 
     Embodiment 150 is the light source system of Embodiment 148, wherein each first region selectively absorbs light within each of the first and second spectral profiles. 
     Embodiment 151 is the light source system of Embodiment 148, wherein light emitted from the light source propagating along the first direction has a first set of color coordinates and propagating along the second direction has a second set of color coordinates, wherein light transmitted by the light control film propagating along the first direction has a third set of color coordinates and propagating along the second direction has a fourth set of color coordinates, a difference between the third and fourth sets of color coordinates being less than a difference between the first and second sets of color coordinates. 
     Embodiment 152 is a retroreflective system, including: 
     a retroreflective sheet for retroreflecting light; and 
     a light control film disposed on the retroreflective sheet, such that for a first wavelength, light incident on the light control film at each of a first and second angles of incidence is retroreflected, and for a second wavelength, light incident on the light control film at the first, but not the second, angle of incidence is retroreflected. 
     Embodiment 153 is the retroreflective system of Embodiment 152, wherein the light control film includes a greater first viewing angle for the first wavelength and a smaller viewing angle for the second wavelength. 
     Embodiment 154 is the retroreflective system of Embodiment 152, wherein the first angle of incidence is substantially equal to zero relative to a line normal to a plane of the light control film. 
     Embodiment 155 is the retroreflective system of Embodiment 152, wherein the retroreflective sheet includes at least one of microsphere beads and corner cubes. 
     Embodiment 156 is the retroreflective system of Embodiment 152, wherein the light control film includes a plurality of spaced apart first regions, each first region having a substantially low transmission at the second, but not the first, wavelength. 
     Embodiment 157 is the detector system of Embodiment 38, wherein the detector includes a photovoltaic device. 
     Embodiment 158 is the detector system of Embodiment 38, wherein the detector includes a solar battery, a solar cell, or a solar detector. 
     Embodiment 159 is the detector system of Embodiment 38, wherein the detector is a detector in a camera. 
     Embodiment 160 is a camera including the detector system of Embodiment 38. 
     Embodiment 161 is the light source system of Embodiment 148, wherein the light source includes a light emitting diode (LED), a laser light source, a halogen light source, a metal halide light source, a tungsten light source, a mercury vapor light source, a short arc xenon light source, or the sun. 
     Unless otherwise indicated, all numbers expressing feature sizes, amounts, and physical properties used in the specification and claims are to be understood as being modified by the term “about.” Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by those skilled in the art utilizing the teachings disclosed herein. 
     Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations can be substituted for the specific embodiments shown and described without departing from the scope of the present disclosure. This application is intended to cover any adaptations or variations of the specific embodiments discussed herein. Therefore, it is intended that this disclosure be limited only by the claims and the equivalents thereof.