Method and system for high resolution digitized display
A method and system for increasing dynamic digitized wavefront resolution, i.e., the density of output beamlets, can include receiving a single collimated source light beam and producing multiple output beamlets spatially offset when out-coupled from a waveguide. The multiple output beamlets can be obtained by offsetting and replicating a collimated source light beam. Alternatively, the multiple output beamlets can be obtained by using a collimated incoming source light beam having multiple input beams with different wavelengths in the vicinity of the nominal wavelength of a particular color. The collimated incoming source light beam can be in-coupled into the eyepiece designed for the nominal wavelength. The input beams with multiple wavelengths take different paths when they undergo total internal reflection in the waveguide, which produces multiple output beamlets.
1. An image display system comprising:
a waveguide;
an optical device configured for receiving an incoming light beam and providing a plurality of input beamlets to the waveguide, wherein the optical device comprises:
a first prism and a second prism separated by an air gap, a first surface of the first prism and a second surface of the second prism being disposed in parallel and adjacent to each other across the air gap, the first surface being partially reflective and the second surface being substantially totally reflective,
wherein the first prism and the second prism are configured to receive the incoming light beam and to provide a first plurality of beamlets;
wherein the first surface is configured for receiving the incoming light beam and reflecting a first portion of the incoming light beam and to allow a second portion of the incoming light beam to pass through;
the second surface is configured for reflecting each light beam from the first surface back to the first surface; and
for each light beam directed to the first surface from the second surface, the first surface allowing a portion to pass through, and reflecting a remaining portion to the second surface;
each beamlet of the first plurality of beamlets being derived from a portion of the incoming light beam, the first plurality of beamlets being offset spatially;
a third prism and a fourth prism, a third surface of the third prism and a fourth surface of the fourth prism disposed in parallel and adjacent to each other, the third surface being partially reflective and the fourth surface being substantially totally reflective;
wherein the third prism and the fourth prism are configured to receive the first plurality of beamlets and to provide the plurality of input beamlets, wherein the first plurality of beamlets enter the third prism perpendicular to a first side surface of the third prism; and
wherein the first plurality of beamlets is offset spatially and traverses across a longitudinal direction of the waveguide, and the plurality of input beamlets is offset along a latitudinal direction of the waveguide, resulting in a 2D (two-dimensional) array of beamlets;
wherein the waveguide is configured for:
receiving the plurality of input beamlets;
propagating the plurality of input beamlets by total internal reflection (TIR);
providing an output coupling element optically coupled to the waveguide; and
outputting multiple groups of output beamlets using the output coupling element, each group of output beamlets including a portion of each of the plurality of input beamlets propagating in the waveguide by total internal reflection.
2. The image display system of claim 1 , wherein the plurality of input beamlets is directed in parallel toward the waveguide.
3. The image display system of claim 1 , wherein the multiple groups of output beamlets are spaced apart by a bounce spacing of the waveguide.
4. The image display system of claim 1 , wherein the partially reflective first surface is characterized by a uniform reflectivity.
5. The image display system of claim 1 , wherein the waveguide comprises a top surface, a portion of which is configured for receiving the plurality of input beamlets from the optical device.
6. The image display system of claim 5 , wherein the third surface and the fourth surface are configured to form an incoupling angle with the top surface of the waveguide.
7. The image display system of claim 1 , wherein the waveguide is positioned in a lateral plane, the third and fourth surfaces being disposed at an oblique angle to the lateral plane.
8. The image display system of claim 1 , wherein the plurality of input beamlets exit the third prism perpendicular to a second side surface of the third prism.
9. The image display system of claim 8 , wherein the second side surface of the third prism is parallel to the waveguide.
10. The image display system of claim 8 , wherein the first side surface of the third prism is perpendicular to the second side surface of the third prism.