Curved collimator with color correction
AssigneeGoogle Inc.
InventorsOscar Alberto Martinez, Ozan Cakmakci
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Abstract
An apparatus includes a curved lightguide having a curved collimator configured to receive and collimate display light from a light source. A color correcting lens is disposed between the light source and an entrance surface of the curved collimator. The color correcting lens compensates for wavelength-dependent focal shifts by directing red, green, and blue portions of the display light to substantially overlap at a common focal plane of the curved collimator. Embedded freeform features configured as total internal reflection mirrors are provided within the curved collimator to collimate the display light. A pupil replicator is disposed within the curved lightguide and configured to expand an exit pupil based on the collimated display light.
Claims11
An apparatus, comprising:
- a curved lightguide;
- a curved collimator disposed within the curved lightguide;
- a light source;
- and
- a color correcting lens disposed between the light source and an entrance surface of the curved collimator.
A method of collimating display light, comprising:
- projecting display light from a light source toward a curved collimator disposed within a curved lightguide;
- passing the display light through a color correcting lens disposed between the light source and an entrance surface of the curved collimator, the color correcting lens reducing chromatic aberration of the display light;
- and
- collimating the display light within the curved collimator using embedded freeform features configured as total internal reflection (TIR) mirrors.
Dependencies are inferred from the claim text.