Multi-line scanning display for near-eye displays
AssigneeFacebook Technologies, LLC
InventorsWanli Chi, Yijing Fu, Pasi Saarikko
Life of this patent
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Abstract
A scanning display includes a light source and a scanning assembly. The light source is configured to emit source light from a plurality of rows of emitters that are arranged parallel to a first dimension. The scanning assembly includes at least one optical element that conditions the source light. The scanning assembly is configured to scan the conditioned source light along a second dimension that is orthogonal to the first dimension. The scanning assembly configured to output the scanned light over a portion of a target area of an output waveguide. And a brightness of the scanned image light offsets dimming caused by the output waveguide expanding the scanned light in at least one dimension.
Claims20
A scanning display comprising:
- a light source configured to emit source light from a plurality of rows of emitters that are arranged in a plurality of dense configurations parallel to a first dimension;
- and
- a scanning assembly configured to:
- condition the source light,
- scan the conditioned source light along a second dimension that is orthogonal to the first dimension to form scanned image light, and
- output the scanned image light to a portion of a target area of an output waveguide, a brightness of each portion of the scanned image light corresponding to a respective dense configuration of the plurality of dense configurations being controlled to have a constant gradient across an overscan region corresponding to an angular portion of a field-of-view (FOV) such that an overall brightness intensity of the scanned image light is flat across the FOV,
- the output waveguide configured to:
- expand the scanned image light in at least one dimension to form an expanded image light, and
- output the expanded image light to an eyebox of a headset.
A near-eye display (NED) comprising:
- a light source configured to emit source light from a plurality of rows of emitters that are arranged in a plurality of dense configurations parallel to a first dimension;
- a scanning assembly configured to:
- condition the source light,
- scan the conditioned source light along a second dimension that is orthogonal to the first dimension to form scanned image light, and
- output the scanned image light over a portion of a target area, a brightness of each portion of the scanned image light corresponding to a respective dense configuration of the plurality of dense configurations being controlled to have a constant gradient across an overscan region corresponding to an angular portion of a field-of-view (FOV) such that an overall brightness intensity of the scanned image light is flat across the FOV;
- and
- an output waveguide including a coupling element positioned at the target area, the coupling element configured to:
- in-couple the scanned image light,
- expand the in-coupled light in at least one dimension to form an expanded image light, and
- output the expanded image light to an eyebox of the NED.
Dependencies are inferred from the claim text.