System and method for holographic displays
A holographic display can include a light source configured to output light; a parallax generator optically coupled to the light source; an optical volume, where the light is perceivable as a three dimensional image within the optical volume; optionally, a flip controller; and, optionally, a viewcone expander.
1. An autostereoscopic display comprising:
a light source configured to output light associated with a plurality of views;
a lenticular array optically coupled to the light source, wherein each view of the plurality of views is directed in a different direction by the lenticular array;
a frame defining an optical volume optically coupled to the lenticular array, wherein the plurality of views are perceivable as a three dimensional image within the optical volume; and
a privacy screen comprising a microlouver array a predetermined distance from the lenticular array, wherein the lenticular array is between the light source and the privacy screen, wherein a microlouver of the microlouver array comprises a motheye structure comprising a tapered micropillar array, wherein a maximum diameter of a micropillar of the tapered micropillar array is at most 380 nm.
2. The autostereoscopic display of claim 1 , wherein the privacy screen further comprises a filler, wherein the microlouver array is disposed in the filler.
3. The autostereoscopic display of claim 2 , wherein an index of refraction of the filler differs from an index of refraction of the microlouver array by at most 0.05.
4. The autostereoscopic display of claim 1 , further comprising a baffle between two lenticules of the lenticular array, wherein light is not transmitted through the baffle.
5. The autostereoscopic display of claim 4 , wherein the baffle and the lenticular array are index matched.
6. The autostereoscopic display of claim 4 , wherein the baffle absorbs visible light.
7. The autostereoscopic display of claim 1 , wherein the predetermined distance is between about 0.1 cm and 1 cm.
8. The autostereoscopic display of claim 7 , wherein a pitch of the microlouver array is between about 20-200 micrometers.
9. The autostereoscopic display of claim 1 , wherein the frame comprises reflective or emissive surfaces surrounding the optical volume.
10. The autostereoscopic display of claim 1 , wherein the lenticular array comprises a prismatic lenticule, wherein the prismatic lenticule comprises a tilt angle between a curved portion of the lenticule and a face of the light source.
11. The holographic display of claim 10 , wherein the lenticular array comprises a set of prismatic lenticules, wherein the set of prismatic lenticules are mirror-symmetric about a center of the set of prismatic lenticules.
12. The holographic display of claim 1 , wherein the privacy screen is operable to block duplicate views from being displayed.
13. The holographic display of claim 1 , wherein the privacy screen is operable to remove a flip artifact from the displayed light.
14. A holographic display comprising:
a light source configured to output light associated with a plurality of views;
a lenticular array optically coupled to the light source, wherein each view of the plurality of views is directed in a different direction by the lenticular array;
an optical volume optically coupled to the lenticular array, wherein the plurality of views are perceivable as a three dimensional image within the optical volume; and
a privacy film configured to block light from being transmitted outside of a privacy film viewcone, wherein the lenticular array is between the light source and the privacy screen, wherein the lenticular array is a predetermined distance from the privacy film, wherein the privacy film comprises a microlouver array disposed within a filler, wherein the microlouver array is index-matched to the filler, and wherein the microlouver array comprises an antireflective coating on an interface between the filler and the microlouver.
15. The holographic display of claim 14 , further comprising a baffle configured to reduce a cross-talk between light passing through each lenticule of the lenticular array.
16. The holographic display of claim 15 , wherein the baffle is index-matched to the lenticular array or a medium proximal the lenticular array.
17. The holographic display of claim 14 , wherein views within a predetermined angular separation of the privacy film viewcone are dimmed.
18. The holographic display of claim 17 , wherein an amount of view dimming for each view depends on an angular separation between the respective view and the privacy film viewcone.
19. The holographic display of claim 14 , wherein the plurality of views are directed in a lenticular viewcone, wherein a center of the lenticular viewcone and a center of the privacy film viewcone differ by at most 5°.