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US 2019/0155136 A1Published application
Assymetric spot area spoke reduction
AssigneeTexas Instruments Incorporated
InventorsVikrant R. Bhakta, Steven Paul Krycho
Life of this patent
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Abstract
In described examples, one or more devices include: a light source to generate a beam of light; and optics to generate a spot of light in response to the beam of light. A color wheel revolves in a direction of rotation about an axis, so the spot of light illuminates an area of the color wheel. The spot of light has: a first width; and a second width wider than the first width and orthogonal to the first width. The first width is aligned tangential to the direction of rotation.
Claims20
Apparatus, comprising:
- a light source to generate a beam of light;
- optics to generate a spot of light in response to the beam of light;
- and
- a color wheel arranged to revolve in a direction of rotation about an axis, the spot of light being an illuminated area of the color wheel, and the optics being arranged to astigmatically generate the spot of light having:
- a first width aligned tangential to the direction of rotation;
- and a second width wider than the first width and orthogonal to the first width.
3 more elements
(canceled)
Apparatus, comprising:
- a light source to generate a beam of light;
- optics arranged for astigmatically lensing the beam of light to generate a spot of light;
- and
- a color wheel arranged to revolve in a direction of rotation about an axis, the color wheel including phosphors for emitting light in response to the spot of light, the emitted light including time-variant colors according to a degree of rotation of the color wheel, the spot of light being an illuminated area of the color wheel, and the spot of light having:
- a first width aligned tangential to the direction of rotation;
- and a second width wider than the first width and orthogonal to the first width.
3 more elements
Apparatus, comprising:
- a light source including multi-mode laser diodes to generate respective beams of light;
- optics, including an astigmatic lens, to generate a spot of light in response to the beams of light;
- and
- a color wheel arranged to revolve in a direction of rotation about an axis, the color wheel including phosphors for emitting light in response to the spot of light, the emitted light including time-variant colors according to a degree of rotation of the color wheel, the spot of light being an illuminated area of the color wheel, and the spot of light having:
- a first width aligned tangential to the direction of rotation;
- and a second width wider than the first width and orthogonal to the first width.
3 more elements
A system, comprising:
- a light source to generate a beam of light;
- optics to generate a spot of light in response to the beam of light, the spot of light having:
- a first width;
- and a second width wider than the first width and orthogonal to the first width;
- a color wheel including at least first and second adjacent color regions to generate respective first and second colors, the first color being different from the second color, the spot of light being an illuminated portion of the color wheel, the color wheel being rotatable to a position for the spot of light to simultaneously illuminate portions of the first and second adjacent color regions, and the first width being aligned tangential to a direction of rotation of the color wheel;
- a light modulator to modulate light filtered or reflected by the color wheel, the light modulator being arranged to shutter the light filtered or reflected by the color wheel during a spoke time;
- and
- a projection lens to generate a displayed image by projecting and focusing the modulated light onto a display surface.
5 more elements
(canceled)
(canceled)
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A method comprising:
- generating a beam of light;
- reshaping the beam of light to form a reshaped beam, the reshaped beam being generated by at least one of:
- an asymmetric aperture;
- astigmatically refracting the beam of light;
- or astigmatically reflecting the beam of light;
- and
- in response to the reshaped beam, generating an asymmetric spot of light on an area of a color wheel that revolves in a direction of rotation, the spot of light having:
- a first width aligned tangential to the direction of rotation;
- and a second width wider than the first width and orthogonal to the first width.
6 more elements
Dependencies are inferred from the claim text.