Near eye 3D display with separate phase and amplitude modulators
Augmented reality glasses include near eye displays the include sources of imagewise amplitude modulated light optical coupled to spatial phase modulators or active zone plate modulators and optically coupled to eye coupling optics. The sources of imagewise amplitude modulated light can include emissive 2D display panels or light sources coupled to imagewise amplitude modulators. The eye coupling optics can include volume holographic diffraction gratings.
1. A near eye display system comprising:
a source of imagewise amplitude modulated light;
a spatial phase modulator optically coupled to the source of imagewise amplitude modulated light, wherein the spatial phase modulator is configured to impart a wavefront curvature to light received from the source of imagewise amplitude modulated light; and
eye coupling optics optically coupled to the spatial phase modulator.
2. The near eye display system according to claim 1 , wherein:
the source of imagewise amplitude modulated light comprises a pixelated emissive light source for generating an image; and
the spatial phase modulator is positioned along an optical path between the pixelated emissive light source and the eye coupling optics.
3. The near eye display system according to claim 2 , wherein the pixelated emissive light source comprises an Organic Light Emitting Diode panel.
4. The near eye display system according to claim 3 , wherein the pixelated emissive light source comprises a micro Light Emitting Diode panel.
5. The near eye display system according to claim 1 , comprising:
a phase modulator driver coupled to the spatial phase modulator, wherein the phase modulator driver is configured to generate a diffractive lens pattern on the spatial phase modulator.
6. The near eye display system according to claim 5 , wherein the phase modulator driver is configured to receive depth information and to generate the diffractive lens pattern based on the depth information.
7. The near eye display system according to claim 5 , wherein the phase modulator driver is configured to generate an array of diffractive lens patterns and the diffractive lens pattern is included in the array of diffractive lens patterns.
8. The near eye display system according to claim 5 , comprising:
an eye tracking camera;
circuitry coupled to the source of imagewise amplitude modulated light, the spatial phase modulator, and the eye tracking camera, wherein the circuitry is configured to:
drive the source of imagewise amplitude modulated light to display a scene that includes a plurality of virtual objects;
receive information from the eye tracking camera that is indicative of a particular virtual object among the plurality of virtual objects that a user is looking at; and
drive the spatial phase modulator to adjust a light wavefront curvature based on a distance associated with the particular virtual object among the plurality of virtual objects that is identified based on the information from the eye tracking camera.
9. The near eye display system according to claim 8 , wherein the circuitry is further configured to drive the spatial phase modulator to generate a Fresnel pattern that is shifted based on the information from the eye tracking camera.
10. The near eye display system according to claim 1 , comprising:
a phase modulator driver coupled to the spatial phase modulator, wherein the phase modulator driver is configured to generate a superposition of diffractive lens patterns.
11. The near eye display system according to claim 1 , wherein the wavefront curvature is an inverse of a virtual image distance.