Measuring content brightness in head worn computing
Aspects of the present invention relate to methods and systems for measuring and managing the brightness of digital content in a field of view of a head-worn computer.
1. A system comprising:
an optics module comprising:
an illumination light source;
a splitter comprising a polarizer and a mirror;
a reflective display configured to receive illumination light from the illumination light source via a quarter-wave plate and further via the polarizer, and further configured to reflect image light toward a user's eye via the quarter-wave plate;
a first infrared light source configured to present first infrared light to the user's eye via the mirror for reflection in the user's eye;
a first sensor configured to receive, via the mirror, the first infrared light reflected in the user's eye; and
a second infrared light source configured to present second infrared light to the user's eye via the mirror for reflection in the user's eye, wherein:
the first sensor is further configured to receive, via the mirror, the second infrared light reflected in the user's eye, and
the first infrared light comprises infrared light of a first wavelength and the second infrared light comprises infrared light of a second wavelength different from the first wavelength.
2. The system of claim 1 , wherein:
the system further comprises a wearable head device,
the wearable head device comprises an upper optics module comprising the optics module, and
the wearable head device further comprises a lower optics module disposed between the user's eye and the upper optics module.
3. The system of claim 1 , wherein the mirror comprises a hot mirror.
4. The system of claim 1 , wherein the image light is polarized and the first infrared light is unpolarized.
5. The system of claim 1 , wherein the optics module further comprises a second sensor configured to receive, via the polarizer, image light reflected in the user's eye.
6. The system of claim 5 , wherein the second sensor is configured to receive the image light concurrently with the first sensor receiving the first infrared light.
7. A method comprising:
receiving, at a reflective display of an optics module, illumination light from an illumination light source via a quarter-wave plate and further via a polarizer;
in response to the reflective display receiving the illumination light, reflecting image light toward a user's eye via the quarter-wave plate;
presenting, via a first infrared light source, first infrared light to the user's eye via a mirror for reflection in the user's eye;
receiving, at a first sensor, via the mirror, the first infrared light reflected in the user's eye;
presenting, via a second infrared light source, second infrared light to the user's eye via the mirror; and
receiving, at the first sensor, via the mirror, the second infrared light reflected via the user's eye,
wherein:
the optics module comprises a splitter, the splitter comprising the polarizer and further comprising the mirror, and
the first infrared light comprises infrared light of a first wavelength and the second infrared light comprises infrared light of a second wavelength different from the first wavelength.
8. The method of claim 7 , wherein:
the user is a user of a wearable head device comprising an upper optics module comprising the optics module, and
the wearable head device further comprises a lower optics module disposed between the user's eye and the upper optics module.
9. The method of claim 7 , wherein the mirror comprises a hot mirror.
10. The method of claim 7 , wherein the image light is polarized and the first infrared light is unpolarized.
11. The method of claim 7 , further comprising:
receiving, at a second sensor, via the polarizer, image light reflected in the user's eye.
12. The method of claim 11 , wherein the second sensor receives the image light concurrently with the first sensor receiving the first infrared light.