Method and system for reducing line separation artifacts in interlaced image projection
AssigneeMagic Leap, Inc.
InventorsLionel Ernest Edwin, Bjorn Nicolaas Servatius Vlaskamp, Samuel A. Miller, Aaron M. Clarke
Life of this patent
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Abstract
An image display system includes an optical subsystem configured to emit a modulated light beam, and a scanning mirror for generating a reflected light beam that is scanned according to randomly selected or pseudo-randomly selected scan patterns to generate multiple image fields of a multiple interlaced scan image. A plurality of different scan patterns can be cycled through, randomly or pseudo-randomly selected, for the different image fields to reduce artifacts that may be observed while viewing a projected image.
Claims20
An image projection system, comprising:
- an optical subsystem for emitting a modulated light beam, wherein the modulated light beam is modulated according to a plurality of image fields in sequence;
- a scanning mirror positioned to intercept the modulated light beam and generate a reflected light beam, wherein the scanning mirror includes an actuator configured to adjust an orientation of the scanning mirror according to a sequence of scan patterns, wherein the sequence of scan patterns corresponds to:
- a randomly selected scan pattern sequence of a plurality of different scan patterns;
- a pseudo-randomly selected scan pattern sequence of the plurality of different scan patterns;
- or
- a quasi-randomly selected scan pattern sequence of the plurality of different scan patterns;
- and
- projection optics positioned to receive the reflected light beam and project a plurality of images in sequence, wherein each image of the plurality of images comprises multiple image fields of the plurality of image fields;
- wherein each scan pattern of the sequence of scan patterns is (i) randomly selected, pseudo-randomly selected, or quasi-randomly selected from a fixed number of different scan patterns in the plurality of different scan patterns, and is (ii) phase shifted relative to each other scan pattern of the plurality of different scan patterns.
A method for projecting an image, the method comprising:
- generating a modulated light beam, wherein the modulated light beam is modulated according to a plurality of image fields in sequence;
- illuminating a scanning mirror with the modulated light beam to generate a reflected light beam;
- and
- projecting the reflected light beam to generate a plurality of images, wherein each image of the plurality of images is generated by projecting multiple image fields of the plurality of image fields in sequence, and wherein projecting each image field of the plurality of image fields includes adjusting an orientation of the scanning mirror according to a sequence of scan patterns corresponding to:
- a randomly selected scan pattern sequence of a plurality of different scan patterns;
- a pseudo-randomly selected scan pattern sequence of the plurality of different scan patterns;
- or
- a quasi-randomly selected scan pattern sequence of the plurality of different scan patterns;
- wherein each scan pattern of the sequence of scan patterns is (i) randomly selected, pseudo-randomly selected, or quasi-randomly selected from a fixed number of different scan patterns in the plurality of different scan patterns, and is (ii) phase shifted relative to each other scan pattern of the plurality of different scan patterns.
Dependencies are inferred from the claim text.