High contrast projection screen with stray light rejection

Abstract

A multi-layer projection screen includes a transparent substrate having first and second sides, a stray light rejection layer, and a lens array. The stray light rejection layer is disposed across the first side of the transparent substrate. The stray light rejection layer includes an array of pillar structures, wherein each pillar structure of the array of pillar structures includes an entrance aperture, an exit aperture, a substantially transparent pathway extending from the entrance aperture to the exit aperture, and an opaque side wall surrounding the transparent pathway. The lens array is disposed across the second side of the transparent substrate and optically aligned to the array of pillar structures. The stray light rejection layer blocks display light received from the lens array having an oblique trajectory that is greater than a threshold angle from a normal of the second side of the transparent substrate.

Description

TECHNICAL FIELD[0001]This disclosure relates generally to the field of optics, and in particular but not exclusively, relates to display screens.BACKGROUND INFORMATION[0002]Conventional rear projection screens use a thin diffusing layer in the form of a matte screen. An image is projected onto the back of the diffusing layer, where it is diffused and scattered into the viewing environment. The diffusing layer provides an image surface and its diffusive nature serves to increase the viewing angles from which the image can be observed. In order to provide good image quality, it is desirable for these projection screens to provide high image contrast and sharp image quality.[0003]Conventional rear projection screens often suffer from poor image contrast in well-lit rooms, at least in part, from the scattering of ambient light back into the viewing environment. This backscattered ambient light deleteriously affects the black levels, and therefore contrast, of the rear projection screen....

AI Technical Summary

Benefits of technology

The solution effectively reduces stray light interference and ambient reflections, resulting in improved image contrast and sharpness by blocking stray light and scattering light appropriately, enhancing the overall image quality.

Problems solved by technology

Conventional rear projection screens often suffer from poor image contrast in well-lit rooms, at least in part, from the scattering of ambient light back into the viewing environment.

This backscattered ambient light deleteriously affects the black levels, and therefore contrast, of the rear projection screen.

Furthermore, conventional rear projection screens often suffer from reduced image sharpness or image blur due to stray light in the projection path preceding the image plane of the projection screen.

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