Suppression of stray light in head worn computing

1 . A method comprising:

receiving image light;

reflecting a first portion of the image light via an angled partially reflective surface toward an eye of a user of a wearable head device;

receiving environmental light via a combiner;

transmitting, via the combiner, the environmental light toward the angled partially reflective surface;

receiving, at a microlouver film, a second portion of the image light, via the angled partially reflective surface; and

absorbing, via the microlouver film, the second portion of the image light,

wherein the eye of the user and the angled partially reflective surface are on a same side of the microlouver film.

2 . The method of claim 1 , further comprising transmitting the environmental light toward the eye via the angled partially reflective surface.

3 . The method of claim 1 , wherein the environmental light is received at the angled partially reflective surface via the combiner.

4 . The method of claim 1 , wherein the combiner comprises the microlouver film.

5 . The method of claim 1 , wherein the microlouver film is oriented at an oblique angle with respect to an optical axis of the received image light.

6 . The method of claim 1 , wherein an angle of the microlouver film relative to the optical axis of the received image light is greater than 45 degrees.

7 . The method of claim 1 , wherein the received second portion of the image light is incident on the microlouver film at an angle greater than 30 degrees from normal.

8 . The method of claim 1 , further comprising:

receiving, at the microlouver film, a portion of the environmental light, via the angled partially reflective surface, wherein the portion of environmental light is incident on the microlouver film at an angle within 30 degrees of normal.

9 . The method of claim 1 , further comprising:

transmitting, via an optical element, the first portion of the image light and the second portion of the image light in a first direction toward the angled partially reflective surface;

transmitting, via the optical element, a third portion of the image light in a second direction toward a light trap; and

absorbing, via the light trap, the third portion of the image light.

10 . The method of claim 1 , wherein the microlouver film comprises a privacy filter.

11 . A wearable head device comprising:

an image source configured to produce image light;

an angled partially reflective surface configured to receive the image light and reflect a first portion of the image light toward an eye of a user of the wearable head device; and

a combiner configured to receive environmental light and transmit the environmental light toward the angled partially reflective surface; and

a microlouver film configured to absorb a second portion of the image light, wherein the second portion of the image light is received via the angled partially reflective surface,

wherein the eye of the user and the angled partially reflective surface are on a same side of the microlouver film.

12 . The wearable head device of claim 11 , wherein the angled partially reflective surface is further configured to receive the environmental light and transmit the environmental light toward the eye.

13 . The wearable head device of claim 11 , wherein the environmental light is received at the angled partially reflective surface via the combiner.

14 . The wearable head device of claim 11 , wherein the combiner comprises the microlouver film.

15 . The wearable head device of claim 11 , wherein the microlouver film is oriented at an oblique angle with respect to an optical axis of the received image light.

16 . The wearable head device of claim 11 , wherein an angle of the microlouver film relative to the optical axis of the received image light is greater than 45 degrees.

17 . The wearable head device of claim 11 , wherein the second portion of the image light is incident on the microlouver film at an angle greater than 30 degrees from normal.

18 . The wearable head device of claim 11 , wherein: the microlouver film is further configured to receive a portion of the environmental light via the angled partially reflective surface, and

the portion of environmental light is incident on the microlouver film at an angle within 30 degrees of normal.

19 . The wearable head device of claim 11 , further comprising:

a light trap;

an optical element, the optical element configured to transmit a first portion of the image light and the second portion of the image light in a first direction toward the angled partially reflective surface and further transmit a third portion of the image light in a second direction toward the light trap.

20 . The wearable head device of claim 11 , wherein the microlouver film comprises a privacy filter.