INLINE IN-COUPLING OPTICAL ELEMENTS
A display system includes a waveguide assembly having a plurality of waveguides, each waveguide associated with an in-coupling optical element configured to in-couple light into the associated waveguide. A projector outputs light from one or more spatially-separated pupils, and at least one of the pupils outputs light of two different ranges of wavelengths. The in-coupling optical elements for two or more waveguides are inline, e.g. vertically aligned, with each other so that the in-coupling optical elements are in the path of light of the two different ranges of wavelengths. The in-coupling optical element of a first waveguide selectively in-couples light of one range of wavelengths into the waveguide, while the in-coupling optical element of a second waveguide selectively in-couples light of another range of wavelengths. Absorptive color filters are provided forward of an in-coupling optical element to limit the propagation of undesired wavelengths of light to that in-coupling optical element.
1 . A display system comprising:
a stack of waveguides comprising:
a first absorptive optical filter transmissive to light of a first range of wavelengths and absorptive to light of wavelengths different from the first range of wavelengths;
a first in-coupling optical element configured to receive light transmitted through the first absorptive optical filter;
a first waveguide having a first major surface and a second major surface, wherein the first in-coupling optical element is configured to incouple light of the first range of wavelengths into the first waveguide;
a second waveguide having a first major surface and a second major surface, wherein the second waveguide is forward of the first waveguide;
a second in-coupling optical element configured to incouple light, transmitted through the first absorptive optical filter and the first in-coupling optical element and having a second range of wavelengths different from the first range of wavelengths, into the second waveguide, wherein the second in-coupling optical element is on the first major surface of the second waveguide or the second major surface of the second waveguide; and
a third absorptive optical filter on a major surface of the second wavequide and laterally displaced from the second in-coupling optical element, the third absorptive optical filter configured to absorb incoupled light having a wavelength different from the second range of wavelengths.
2 . The display system of claim 1 , wherein the first in-coupling optical element is on the first major surface of the first waveguide or the second major surface of the first waveguide.
3 . The display system of claim 1 , further comprising a second absorptive optical filter on one or both of the first or second major surfaces of the first waveguide, wherein, as seen in a top-down view, the first absorptive optical filter is laterally displaced from the second absorptive optical filter.
4 . The display system of claim 3 , wherein the second absorptive optical filter comprises a dye.
5 . The display system of claim 1 , wherein the first in-coupling optical element is configured to transmit light having a range of wavelengths different from the first range of wavelengths.
6 . (canceled)
7 . The display system of claim 1 , wherein at least a portion of the first in-coupling optical element and at least a portion of the second in-coupling optical element laterally overlap with each other, as seen in a top-down view.
8 . The display system of claim 1 , further comprising:
a third waveguide rearward of the first waveguide, the third waveguide having a first major surface and a second major surface; and
a third in-coupling optical element configured to incouple light from an incoming beam of light having a third wavelength range into the third waveguide.
9 . The display system of claim 8 , wherein the third in-coupling optical element is on one of the first major surface of the third waveguide or the second major surface of the third waveguide.
10 . The display system of claim 8 , wherein at least a portion of the third in-coupling optical element laterally overlaps with the first in-coupling optical element and the second in-coupling optical element.
11 . The display system of claim 8 , further comprising a fourth absorptive optical filter forward of the third in-coupling optical element and between the second waveguide and the third waveguide.
12 . The display system of claim 11 , wherein the fourth absorptive optical filter comprises a dye.
13 . (canceled)
14 . (canceled)
15 . The display system of claim 1 , wherein the third absorptive optical filter comprises a dye.
16 - 33 . (canceled)
34 . The display system of claim 1 , wherein the first absorptive optical filter comprises a dye.