Displays and methods of operating thereof
There is provided a method of operating a wearable heads-up display (WHUD), which method includes generating first and second lights having respectively first and second wavelengths within about 50 nm of one another. The method also includes directing the first and second lights onto an incoupler of a display optic of the WHUD along first and second ranges of input angles respectively. The first and second ranges of input angles correspond to positions of pixels of first and second portions of an image to be displayed by the WHUD. The incoupler has first and second angular bandwidths corresponding to the first and second wavelengths respectively. A combination of the first and second ranges of input angles is larger than each of the first and second angular bandwidths. Moreover, the method includes directing the first and second lights into a field of view of a user to form the image.
1 . A method, comprising:
directing a first light having a first wavelength onto an incoupler of a display optic at a first angle of incidence and along a first range of input angles relative to the incoupler, the incoupler having a first angular bandwidth corresponding to the first wavelength and a second angular bandwidth corresponding to a second wavelength that is different from the first wavelength, the first wavelength being within approximately 20 nm of the second wavelength and the first range of input angles corresponding to a first portion of an image to be displayed by a wearable heads-up display (WHUD);
directing a second light having the second wavelength onto the incoupler at a second angle of incidence and along a second range of input angles relative to the incoupler, the second range of input angles corresponding to a second portion of the image to be displayed by the WHUD; and
directing, by the display optic, the first light and the second light into a field of view of a user to form the image.
2 . The method of claim 1 , wherein the first wavelength is within approximately 2 nm of the second wavelength.
3 . The method of claim 1 , wherein the incoupler comprises at least one of a hologram and a surface relief grating.
4 . The method of claim 1 , wherein directing the first light onto the incoupler comprises directing the first light onto the incoupler to center the first range of input angles substantially at a center of the first angular bandwidth of the incoupler, and directing the second light onto the incoupler comprises directing the second light onto the incoupler to center the second range of input angles substantially at a center of the second angular bandwidth of the incoupler.
5 . The method of claim 1 , wherein the directing the first light onto the incoupler comprises directing the first light onto the incoupler during a first time portion and a second time portion of a sweep time of a spatial modulator, and the directing the second light onto the incoupler comprises directing the second light onto the incoupler during the second time portion and a third time portion of the sweep time of the spatial modulator.
6 . A wearable heads-up display (WHUD) system, comprising:
a spatial modulator to:
direct a first light having a first wavelength onto an incoupler of a display optic at a first angle of incidence relative to the spatial modulator and along a first range of input angles relative to the incoupler, the incoupler having a first angular bandwidth corresponding to the first wavelength and a second angular bandwidth corresponding to a second wavelength that is different from the first wavelength, wherein the first wavelength is within about 20 nm of the second wavelength and the first range of input angles corresponds to a first portion of an image to be displayed by the WHUD; and
direct a second light having the second wavelength onto the incoupler at a second angle of incidence relative to the spatial modulator and along a second range of input angles relative to the incoupler, wherein the second range of input angles corresponds to a second portion of the image to be displayed by the WHUD; and
a display optic to direct the first light and the second light into a field of view of a user to form the image.
7 . The WHUD system of claim 6 , wherein the first wavelength is within about 2 nm of the second wavelength.
8 . The WHUD system of claim 6 , wherein the incoupler comprises at least one of a hologram and a surface relief grating.
9 . The WHUD system of claim 6 , wherein the spatial modulator directs the first light onto the incoupler to center the first range of input angles at about a center of the first angular bandwidth of the incoupler, and the spatial modulator directs the second light onto the incoupler to center the second range of input angles at about a center of the second angular bandwidth of the incoupler.
10 . The WHUD system of claim 6 , wherein the spatial modulator directs the first light onto the incoupler during a first time portion and a second time portion of a sweep time of the spatial modulator, and the spatial modulator directs the second light onto the incoupler during the second time portion and a third time portion of the sweep time of the spatial modulator.
11 . A non-transitory computer-readable medium storing instructions that, when executed by one or more processors, cause the one or more processors to:
direct a first light having a first wavelength onto an incoupler of a display optic at a first angle of incidence and along a first range of input angles relative to the incoupler, the incoupler having a first angular bandwidth corresponding to the first wavelength and a second angular bandwidth corresponding to a second wavelength that is different from the first wavelength, the first wavelength being within approximately 20 nm of the second wavelength, and the first range of input angles corresponding to a first portion of an image to be displayed by a wearable heads-up display (WHUD);
direct a second light having the second wavelength onto the incoupler at a second angle of incidence and along a second range of input angles relative to the incoupler, the second range of input angles corresponding to a second portion of the image to be displayed by the WHUD; and
direct, by the display optic, the first light and the second light into a field of view of a user to form the image.
12 . The non-transitory computer-readable medium of claim 11 , wherein to direct the first light onto the incoupler includes to direct the first light onto the incoupler to center the first range of input angles substantially at a center of the first angular bandwidth of the incoupler, and wherein to direct the second light onto the incoupler includes to direct the second light onto the incoupler to center the second range of input angles substantially at a center of the second angular bandwidth of the incoupler.
13 . The non-transitory computer-readable medium of claim 11 , wherein to direct the first light onto the incoupler includes to direct the first light onto the incoupler during a first time portion and a second time portion of a sweep time of a spatial modulator, and wherein to direct the second light onto the incoupler includes to direct the second light onto the incoupler during the second time portion and a third time portion of the sweep time of the spatial modulator.