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US 11,889,236 B2Granted
Digital point spread function (DPSF) and dual modulation projection (including lasers) using DPSF
AssigneeDolby Laboratories Licensing Corporation
InventorMartin J. Richards
Life of this patent
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Abstract
A digital PSF for use in a dual modulation display. The invention allows the use of less than optimal point spread (PSF) functions in the optics between the pre-modulator and primary modulator of a dual modulation projection system. This technique uses multiple halftones per frame in the pre-modulator synchronized with a modified bit sequence in the primary modulator to produce a compensation image that reduces the errors produced by the sub-optimal PSF. The invention includes the application to dual modulation and dual modulated 3D viewing systems.
Claims9
A projector, comprising:
- a pre-modulator configured to modulate light into a halftone image;
- a primary modulator configured to further modulate light of the halftone image into a desired image;
- and
- one or more relay optics configured to transfer the light of the halftone image from the pre-modulator to the primary modulator;
- where imperfections of a Point Spread Function (PSF) of the relay optics are compensated by modifying a backlight image used to energize the pre-modulator, wherein the backlight image is composed of a divided sequence, each bit sequence in the divided sequence representing a different partial half-tone image applied to the halftone image, wherein each partial half-tone image implemented for the halftone image includes compensation for the one or more relay optics.
2 more elements
Dependencies are inferred from the claim text.