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US 11,109,003 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.
Claims13
A projector comprising:
- a pre-modulator configured to modulate light into a first image;
- a primary modulator configured to further modulate the light to produce a desired image;
- one or more relay optics configured to transfer the modulated light of the first image to the primary modulator, wherein the transfer optics are further configured to spread pixels of the first image so that each pixel of the first image illuminates a plurality of pixels of the primary modulator;
- and
- a controller configured to energize the pre-modulator with a backlight image based on image data of the desired image, the backlight image further comprising an adjustment of pixels of the backlight image to compensate for imperfections of the relay optics;
- wherein the compensation comprises a difference between a desired point spread function (PSF) of light transferred from the pre-modulator to the primary modulator and a PSF of the relay optics.
3 more elements
Dependencies are inferred from the claim text.