Scanned coarse integral holographic display having holographic lenslets displayed by spatial light modulator
A holographic display system for generating a super hologram with full parallax in different fields of view in the horizontal and vertical directions. The display system includes assemblies or subsystems each adapted to combine holographic displays and coarse integral displays to produce or display a coarse integral hologram. Briefly, the display system described herein teaches techniques for enhancing operations of coarse integral holographic (CIH) displays. The enhanced CIH displays may utilize ganged scanners, may operate scanners to provide boustrophedon scanning, may be configured to add color information such by view sequential color hologram display and scanning, may replace or supplement X-Y scanning abilities with a resonant scanner, and may replace physical lenslet arrays by generating and displaying a holographic lenslet for each elemental hologram used to create the super hologram.
1. A scanning coarse integral holographic display, comprising:
a scanning relay comprising a spatial light modulator displaying elemental holograms of a 3D scene, holographic lenslets provided via display on the spatial light modulator, and a scanner assembly; and
a coarse integral optics assembly positioned between the scanning relay and a viewing space for the holographic display,
wherein each of the holographic lenslets is paired with one of the elemental holograms,
wherein the scanner assembly directs each of the elemental holograms and a paired one of the holographic lenslets onto a plane within the coarse integral optics assembly to provide a displayed lenslet and image array, and
wherein the coarse integral optics assembly is adapted to combine the elemental holograms into a single hologram viewable in a hologram image plane.
2. The holographic display of claim 1 , wherein the scanner assembly includes a resonant scanner to provide vertical dither.
3. The holographic display of claim 2 , wherein the scanner assembly includes an X-Y scanner receiving output light of the resonant scanner and scanning the elemental holograms and the holographic lenslets and wherein the scanner assembly further includes at least one relay lens disposed between the resonant scanner and the X-Y scanner.
4. The holographic display of claim 1 , wherein the scanner assembly directs the elemental holograms and the holographic lenslets following a boustrophedon scanning pattern.
5. The holographic display of claim 1 , wherein the elemental holograms comprise a set of red, green, and blue holograms for each view of the single holograms.
6. The holographic display of claim 5 , wherein the spatial light modulator is illuminated with a light source providing view sequential color synchronized with the display of the red, green, and blue holograms on the spatial light modulator.
7. A scanning coarse integral holographic display, comprising:
a scanning relay comprising a spatial light modulator;
a controller operating the spatial light modulator to display sub-holograms of a 3D scene and to concurrently display an array of holographic lenslets with each of the holographic lenslets paired with one of the sub-holograms; and
a coarse integral optics assembly comprising a pair of transform lenses positioned between the scanning relay and a viewing space for the holographic display,
wherein the scanning relay further includes a scanner assembly operable to direct each of the sub-holograms and a paired one of the holographic lenslets onto a plane between a pair of transform lenses, and
wherein the coarse integral optics assembly combines with the pair of the transform lenses the plurality of sub-holograms into a single hologram viewable in a hologram image plane in the viewing space.
8. The holographic display of claim 7 , wherein each of the holographic lenslets is an attached holographic lenslet that is computed and attached to the paired one of the sub-holograms.
9. The holographic display of claim 7 , wherein the scanner assembly includes a resonant scanner providing vertical dither.
10. The holographic display of claim 7 , wherein the scanner assembly includes a resonant scanner providing a larger mirror, a larger scan angle, or a faster scan frequency.
11. The holographic display of claim 10 , wherein the scanner assembly further includes an X-Y scanner receiving output light of the resonant scanner and scanning the sub-holograms and the holographic lenslets onto the plane between the pair of the transform lenses.
12. The holographic display of claim 7 , wherein the controller operates the scanner assembly to perform boustrophedic scanning.
13. The holographic display of claim 7 , wherein the sub-holograms comprise a set of red, green, and blue holograms for each view of the single holograms and wherein the spatial light modulator is illuminated with a light source providing overlapping view sequential color synchronized with the display of the red, green, and blue holograms on the spatial light modulator.