Spatially multiplexed lens for head mounted display
An optical combiner includes an off-axis spatially multiplexed lens optically coupled to receive image light and direct the image light in an eye-ward direction. The off-axis spatially multiplexed lens includes a first sub-lens multiplexed with a second sub-lens. The first sub-lens and the sub-lens are configured to direct the image light to designated eyeward-regions.
1. A Head Mounted Display (“HMD”) comprising:
a display module to generate image light; and
an optical combiner for combining the image light with external scene light, wherein the optical combiner includes an off-axis spatially multiplexed lens (“OASML”) optically coupled to receive the image light and direct the image light in an eye-ward direction, the OASML including:
a first sub-lens having a first focal length and optically coupled to receive the image light and direct a first color of the image light to a first eyeward-region; and
a second sub-lens spatially multiplexed with the first sub-lens along a common optical axis and optically coupled to receive the image light and direct a second color of the image light to the first eyeward-region, wherein the second sub-lens has a second focal length different from the first focal length to focus the second color of the image light at a second depth of the first eyeward-region behind a first depth where the first color of the image light is focused, the second color different from the first color.
2. The HMD of claim 1 , wherein the OASML further includes a third sub-lens multiplexed with the first and second sub-lenses along a common optical axis, the third sub-lens optically coupled to receive the image light and direct a third color of the image light toward the first eyeward-region, wherein the third sub-lens has a third focal length to focus the third color of the image light at a third depth of the first eyeward-region behind the second depth.
3. The HMD of claim 1 , wherein the OASML is an off-axis portion of a dartboard patterned multiplexing of two different lenses substantially sharing the same aperture.
4. The HMD of claim 1 , wherein the OASML is a reflective lens, and wherein the first sub-lens is coated with a first color filter that reflects the first color of the image light toward the first eyeward-region and the second sub-lens is coated with a second color filter that reflects the second color of the image light toward the first eyeward-region.
5. The HMD of claim 1 , wherein the OASML is reflective lens, and wherein the first sub-lens includes first diffractive structures tuned to reflect the first color of the image light toward the first eyeward-region and the second sub-lens includes second diffractive structures tuned to reflect the second color of the image light toward the first eyeward-region.
6. The HMD of claim 1 , wherein the OASML is a transmissive lens, and wherein the first sub-lens is coated with a first color filter that transmits the first color of the image light toward the first eyeward-region and the second sub-lens is coated with a second color filter that transmits the second color of the image light toward the first eyeward-region.
7. The HMD of claim 1 , wherein the OASML is a transmissive lens, and wherein the first sub-lens includes first diffractive structures tuned to pass the first color of the image light toward the first eyeward-region and the second sub-lens includes second diffractive structures tuned to pass the second color of the image light toward the first eyeward-region.