Eye tracking system
An example eye-tracking optical assembly includes a light source for illuminating an eye, a first diffraction type polarizing beam splitter (DT-PBS), and a second DT-PBS, wherein the first DT-PBS is configured to direct, based on polarization, a first portion of light from the second DT-PBS towards an eye-tracking detector.
1. An eye-tracking optical assembly comprising:
a light source for illuminating an eye;
a first diffraction type polarizing beam splitter (DT-PBS); and
a second DT-PBS, wherein the first DT-PBS is configured to direct, based on polarization, a first portion of light from the second DT-PBS towards an eye-tracking detector,
wherein one of the first DT-PBS and the second DT-PBS is configured to compensate for a spectral dispersion of one other of the first DT-PBS and the second DT-PBS.
2. The eye-tracking optical assembly of claim 1 , wherein the second DT-PBS is configured to direct, based on polarization, the first portion state of light towards the first DT-PBS.
3. The eye-tracking optical assembly of claim 1 , wherein at least one of the first DT-PBS and the second DT-PBS comprise a reflective or transmissive polarization volume grating, PBP grating, a liquid crystal filled surface relief grating, or a holographic polymer dispersed liquid crystal grating.
4. The eye-tracking optical assembly of claim 1 , wherein at least one of the first DT-PBS and the second DT-PBS reflect and direct, based on polarization, the first portion of light.
5. The eye-tracking optical assembly of claim 1 , wherein at least one of the first DT-PBS and the second DT-PBS transmit and direct, based on polarization, the first portion of light.
6. The eye-tracking optical assembly of claim 1 , wherein at least one of the first DT-PBS and the second DT-PBS is configured with optical power to converge or diverge light.
7. The eye-tracking optical assembly of claim 1 , wherein the second DT-PBS is configured to direct, based on polarization, the first portion of light towards an eye.
8. A head-mounted display (HMD) comprising:
a light source for illuminating an eye; and
a first diffraction type polarizing beam splitter (DT-PBS) configured to direct, based on polarization, a first portion of light from a second DT-PBS towards an eye-tracking detector,
wherein one of the first DT-PBS and the second DT-PBS is configured to compensate for a spectral dispersion of one other of the first DT-PBS and the second DT-PBS.
9. The HMD of claim 8 , wherein the second DT-PBS is configured to direct, based on polarization, the first portion of light towards the first DT-PBS.
10. The HMD of claim 8 , wherein at least one of the first DT-PBS and the second DT-PBS comprise one of a reflective or transmissive polarization volume grating, PBP grating, a liquid crystal filled surface relief grating, or a holographic polymer dispersed liquid crystal grating.
11. The HMD of claim 8 , wherein at least one of the first DT-PBS and the second DT-PBS reflect and direct, based on polarization, the first portion of light.
12. The HIVID of claim 8 , wherein at least one of the first DT-PBS and the second DT-PBS transmit and direct, based on polarization, the first portion of light.
13. The HIVID of claim 8 , wherein at least one of the first DT-PBS and the second DT-PBS is configured with optical power to converge or diverge light.
14. The HMD of claim 8 , wherein the second DT-PBS is configured to direct, based on polarization, the first portion of light towards an eye.
15. A method of tracking one and/or both eyes of an HIVID user comprising:
directing light from a light source towards a user's eye;
reflecting the light from the user's eye towards a first diffraction type polarizing beam splitter (DT-PBS);
directing, based on polarization, a first portion of the light from the first DT-PBS towards a second DT-PBS; and
directing, based on polarization, the first portion of the light from the second DT-PBS towards a detector, wherein one of the first DT-PBS and the second DT-PBS is configured to compensate for a spectral dispersion of one other of the first DT-PBS and the second DT-PBS.
16. The method of claim 15 , wherein the light from the light source is broadband.
17. The method of claim 15 , wherein at least one of the first DT-PBS and the second DT-PBS is configured to reflect and direct, based on polarization, the first portion of the light.
18. The method of claim 15 , wherein at least one of the first DT-PBS and the second DT-PBS is configured to transmit and direct, based on polarization, the first portion of the light.
19. The eye-tracking optical assembly of claim 1 , wherein the second DT-PBS is configured to transmit and direct, based on polarization, the first portion of light towards the first DT-PBS, and the first DT-PBS is configured to reflect and direct, based on polarization, the first portion of light towards the eye-tracking detector.
20. The eye-tracking optical assembly of claim 1 , wherein the second DT-PBS is configured to reflect and direct, based on polarization, the first portion of light towards the first DT-PBS, and the first DT-PBS is configured to transmit and direct, based on polarization, the first portion of light towards the eye-tracking detector.