Dolby Laboratories has patented a digital PSF for dual modulation displays, compensating for sub-optimal PSF functions in projection systems. The invention uses multiple halftones and modified bit sequences to reduce errors. The patent also covers application in dual modulation and dual modulated 3D viewing systems. GlobalData’s report on Dolby Laboratories gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Dolby Laboratories, Cloud gaming was a key innovation area identified from patents. Dolby Laboratories's grant share as of January 2024 was 65%. Grant share is based on the ratio of number of grants to total number of patents.

Projector with dual modulation display compensating for psf imperfections

Source: United States Patent and Trademark Office (USPTO). Credit: Dolby Laboratories Inc

A recently granted patent (Publication Number: US11889236B2) discloses a novel projector design featuring a pre-modulator, a primary modulator, and relay optics to project high-quality images. The innovation lies in compensating for imperfections in the Point Spread Function (PSF) of the relay optics by modifying the backlight image used to energize the pre-modulator. This modification involves creating a backlight image composed of a divided sequence, with each bit sequence representing a different partial half-tone image that includes compensation for the relay optics. By synchronizing the bit sequences on the pre-modulator and primary modulator, the projector ensures the final image quality is optimized across frames.

Moreover, the patented projector is specifically configured for 3D image projection, with left and right images projected through glasses designed for viewing such content. The projector utilizes laser light sources to illuminate the pre-modulator, with specific left and right backlight images for each wavelength. The glasses incorporate wavelength selective filters that pass modulated wavelengths of the left and right images, with spectral properties shifted towards longer wavelengths for enhanced viewing experience. Additionally, the projector and glasses are designed to capture compensated half-tone images modulated for viewing at oblique angles, providing a comprehensive 3D viewing solution. The divided sequence used in the backlight image is structured as a quad sequence divided into four partitions for each frame, ensuring efficient and synchronized image projection for an immersive viewing experience.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.