Reconstructing objects with display zero order light suppression
Methods, apparatus, devices, and systems for reconstructing three-dimensional objects with display zero order light suppression are provided. In one aspect, a method includes illuminating a display with light at an incident angle, a portion of the light illuminating display elements of the display, modulating the display elements of the display with a hologram corresponding to holographic data to diffract the portion of the light to form a holographic scene corresponding to the holographic data, and redirecting display zero order light away from the holographic scene to suppress the display zero order light in the holographic scene. The display zero order light includes reflected light from the display. The light includes a plurality of different colors of light.
1. A method comprising:
illuminating a display with light at an incident angle, a portion of the light illuminating display elements of the display, wherein the light comprises a plurality of different colors of light;
modulating the display elements of the display with a hologram corresponding to holographic data to diffract the portion of the light to form a holographic scene corresponding to the holographic data, wherein the hologram comprises respective control signals for modulating the display elements of the display, and the respective control signals are configured such that, when the display is illuminated with the light, display zero order light comes off the display with a larger deviation angle than the diffracted portion of the light, the display zero order light comprising reflected light from the display; and
redirecting the display zero order light away from the holographic scene to suppress the display zero order light in the holographic scene by using an optically redirecting component to diffract the display zero order light having a larger redirecting incident angle through the optically redirecting component with a substantially larger diffraction efficiency than the diffracted portion of the light, the larger redirecting incident angle corresponding to the larger deviation angle.
2. The method of claim 1 , wherein the diffracted portion of the light forms a reconstruction cone with a viewing angle, and the incident angle is larger than a half of the viewing angle.
3. The method of claim 2 , further comprising configuring the hologram such that the diffracted portion of the light forms the reconstruction cone that is same as a corresponding reconstruction cone to be formed by the diffracted portion of the light if the light is normally incident on the display.
4. The method of claim 1 , further comprising guiding the light to illuminate the display through an optically diffractive component that is configured to diffract the plurality of different colors of light at the incident angle on the display.
5. The method of claim 1 , wherein the optically redirecting component is configured to transmit the diffracted portion of the light to form the holographic scene.
6. The method of claim 5 , further comprising guiding the light to illuminate the display by sequentially guiding the plurality of different colors of light to illuminate the display in a series of time periods.
7. The method of claim 6 , wherein the optical redirecting component comprises a switchable optically redirecting subcomponent configured to diffract a first color of light at a first state during a first time period and transmit a second color of light at a second state during a second time period.
8. The method of claim 6 , wherein the optical redirecting component comprises a switchable optically redirecting subcomponent configured to diffract a first color of light at a first state during a first time period and diffract a second color of light at a second state during a second time period.
9. The method of claim 1 , wherein the optical redirecting component comprises a respective optically redirecting subcomponent for each of the plurality of different colors of light.
10. The method of claim 9 , wherein the respective optically redirecting subcomponents for the plurality of different colors of light are recorded in a same recording structure.
11. The method of claim 9 , wherein the respective optically directing subcomponents for the plurality of different colors of light are recorded in different corresponding recording structures.
12. The method of claim 9 , wherein the optical redirecting component is configured to diffract the plurality of different colors of light at different diffraction angles towards different directions in a three-dimensional (3D) space.
13. The method of claim 12 , wherein the optical redirecting component is configured to diffract at least one of the plurality of different colors of light to be incident at at least one Brewster's angle at an interface.
14. The method of claim 13 , wherein the interface comprises at least one member selected from the group consisting of an interface between a top substrate and a surrounding medium, and an interface between two adjacent substrates.
15. The method of claim 12 , wherein the optical redirecting component is configured to diffract a first color of light and a second color of light within a plane, and a third color of light orthogonal to the plane.
16. The method of claim 12 , wherein the optical redirecting component comprises at least two different optically redirecting subcomponents configured to diffract a same color of light of the plurality of different colors of light.
17. The method of claim 16 , wherein the two different optically redirecting subcomponents are sequentially arranged in the optical redirecting component.
18. The method of claim 9 , wherein the plurality of different colors of light comprises a first color of light and a second color of light, the first color of light having a shorter wavelength than the second color of light, and wherein, in the optically redirecting component, a first optically redirecting subcomponent for the first color of light is arranged closer to the display than a second optically redirecting subcomponent for the second color of light.
19. The method of claim 9 , wherein the optically redirecting component comprises:
a first optically redirecting subcomponent configured to diffract a first color of light;
a second optically redirecting subcomponent configured to diffract a second color of light; and
at least one optically polarizing device arranged between the first and second optically redirecting subcomponents and configured to convert a polarization state of the first color of light such that the first color of light transmits through the second optically redirecting subcomponent.
20. The method of claim 1 , wherein illuminating the display with the light comprises illuminating gaps between adjacent display elements of the display with a second portion of the light, and
wherein the display zero order light comprises at least one member selected from the group consisting of: the second portion of the light reflected at the gaps; the second portion of the light diffracted at the gaps; reflected light from the display elements; and reflected right from a display cover covering the display.
21. An optical device comprising:
an optically diffractive component; and
an optically redirecting component,
wherein the optically diffractive component is configured to diffract light at an incident angle onto a display comprising a plurality of display elements spaced with gaps on the display, the light comprises a plurality of different colors of light, the display is configured to diffract a portion of the light illuminating the display elements, and the optically redirecting component is configured to transmit the portion of the light to form a holographic scene and to redirect display zero order light away from the holographic scene in a three-dimensional (3D) space, the display zero order light comprising reflected light from the display, and
wherein the optical device is configured such that the display zero order light is incident on the optically redirecting component at a redirecting incident angle larger than that of the diffracted portion of the light, and the optically redirecting component is configured to diffract the display zero order light through the optically redirecting component with a substantially larger diffraction efficiency than the diffracted portion of the light.
22. The optical device of claim 21 , wherein the optical redirecting component is configured to diffract display zero order light of the plurality of different colors of light reflected by the display at different diffraction angles towards different directions in the 3D space, the display zero order light comprising reflected light of the plurality of different colors of light by the display.
23. The optical device of claim 22 , wherein the optical diffractive component comprises a plurality of holographic gratings for the plurality of different colors of light, and each of the plurality of holographic gratings is configured to diffract a respective color of light of the plurality of different colors of light at the incident angle on the display.
24. The optical device of claim 22 , wherein the optical redirecting component comprises a plurality of redirecting holographic grating for the display zero order light of the plurality of different colors of light, and each of the plurality of redirecting holographic gratings is configured to diffract display zero order light of a respective color of light of the plurality of different colors of light at a respective diffractive angle towards a respective direction in the 3D space.
25. The optical device of claim 24 , wherein the optical redirecting component comprises at least two different redirecting holographic gratings configured to diffract display zero order light of a same color of light of the plurality of different colors of light.
26. The optical device of claim 24 , wherein the optical redirecting component comprises a switchable redirecting holographic grating configured to diffract a first color of light at a first state during a first time period and transmit or diffract a second color of light at a second state during a second time period.
27. The optical device of claim 24 , wherein the plurality of different colors of light comprises a first color of light and a second color of light, the first color of light having a shorter wavelength than the second color of light, and wherein, in the optically redirecting component, a first redirecting holographic grating for the first color of light is arranged closer to the display than a second redirecting holographic grating for the second color of light.
28. The optical device of claim 24 , wherein fringe planes of at least two redirecting holographic gratings for at least two different colors of light are oriented substantially differently.
29. The optical device of claim 24 , wherein the optically redirecting component comprises:
a first redirecting holographic grating configured to diffract a first color of light;
a second redirecting holographic grating configured to diffract a second color of light; and
at least one optical polarizing device arranged between the first and second redirecting holographic gratings and configured to convert a polarization state of the first color of light such that the first color of light transmits through the second redirecting holographic grating.
30. A system comprising:
a display comprising display elements separated with gaps on the display; and
an optical device comprising:
an optically diffractive component; and
an optically redirecting component,
wherein the optically diffractive component is configured to diffract light at an incident angle onto a display comprising a plurality of display elements spaced with gaps on the display, and wherein the light comprises a plurality of different colors of light,
wherein the display is configured to diffract a portion of the light illuminating the display elements,
wherein the optically redirecting component is configured to transmit the portion of the light to form a holographic scene and to redirect display zero order light away from the holographic scene in a three-dimensional (3D) space, the display zero order light comprising reflected light from the display,
wherein the optical device is configured such that the display zero order light is incident on the optically redirecting component at a redirecting incident angle larger than that of the diffracted portion of the light, and the optically redirecting component is configured to diffract the display zero order light through the optically redirecting component with a substantially larger diffraction efficiency than the diffracted portion of the light, and
wherein the optical redirecting component is configured to diffract display zero order light of the plurality of different colors of light reflected by the display at different diffraction angles towards different directions in the 3D space, the display zero order light comprising reflected light of the plurality of different colors of light by the display.