OPTICAL SYSTEMS FOR HEAD-WORN COMPUTERS
Aspects of the present disclosure relate a head-worn computer with a see-through display wherein computer content is presented to a user wearing the head-worn computer and through which the user sees a surrounding environment, wherein the see-through display generates image light comprised of narrow bandwidths of red, green and blue light and wherein the see-through display further includes a tristimulus notch mirror positioned to reflect the image light towards the user's eye, and wherein the tristimulus notch mirror reflects less than a full width half max of the red image light.
1 . A wearable device, comprising:
a light source configured to generate image light comprising a first bandwidth of light, the first bandwidth of light centered at a first frequency;
a see-through display configured to present the image light to a user; and
a mirror configured to:
direct the image light towards an eye of the user; and
communicate environmental light, wherein:
the image light does not comprise the environmental light,
the environmental light comprises a second bandwidth centered at a second frequency, and
the second frequency differs from the first frequency by less than a threshold frequency; and
one or more filters, the one or more filters configured to apply a bandpass filter to an output of the light source to transmit the first bandwidth of light.
2 . The wearable device of claim 1 , wherein the light source comprises a light emitting diode (LED).
3 . The wearable device of claim 1 , further comprising:
a first optics module comprising the light source; and
a second optics module comprising the mirror,
wherein the light source is configured to project the image light from the first optics module to the second optics module.
4 . The wearable device of claim 1 , wherein the mirror comprises a holographic mirror.
5 . The wearable device of claim 1 , wherein the mirror comprises a notch mirror.
6 . The wearable device of claim 1 , wherein the mirror comprises a curved surface.
7 . The wearable device of claim 1 , wherein the environmental light comprises light emitted by an artificial light source and the second frequency corresponds to a frequency of the artificial light source.
8 . The wearable device of claim 7 , wherein the artificial light source comprises a traffic control signal.
9 . The wearable device of claim 7 , wherein the artificial light source comprises a vehicle light source.
10 . The wearable device of claim 1 , wherein the first frequency equals the second frequency.
11 . The wearable device of claim 1 , wherein:
the first bandwidth has a full width at half maximum (FWHM) of a first value, and
the second bandwidth has a FWHM of a second value less than the first value.
12 . The wearable head device of claim 1 , wherein the light source comprises a color source.
13 . The wearable head device of claim 1 , wherein the see-through display comprises the mirror.
14 . A method comprising:
generating, via a light source of a wearable head device, image light comprising a first bandwidth of light, the first bandwidth of light centered at a first frequency;
presenting, via a see-through display of the wearable head device, the image light to a user of the wearable head device;
directing, via a mirror of the wearable head device, the image light towards an eye of the user;
communicating, via the mirror, environmental light, wherein:
the image light does not comprise the environmental light,
the environmental light comprises a second bandwidth centered at a second frequency, and
the second frequency differs from the first frequency by less than a threshold frequency; and
applying, via one or more filters of the wearable head device, a bandpass filter to an output of the light source to transmit the first bandwidth of light.
15 . The method of claim 14 , wherein the light source comprises a LED.
16 . The method of claim 14 , wherein the mirror comprises a holographic mirror.
17 . The method of claim 14 , wherein the mirror comprises a notch mirror.
18 . The method of claim 14 , wherein the mirror comprises a curved surface.
19 . The method of claim 14 , wherein the environmental light comprises light emitted by an artificial light source and the second frequency corresponds to a frequency of the artificial light source.
20 . The method of claim 14 , wherein the first frequency equals the second frequency.