Patent
High contrast projection
TLDR
An asymmetric aperture stop improves the contrast ratio of a projected image using slightly offset projection, where the majority of the on-state projection light from the modulator array passes through a region that is not centered in the projection lens pupil as discussed by the authors.Abstract:
A method and system for improving the contrast ratio of a projected image An asymmetric aperture stop improves the contrast ratio of a projected image Using slightly offset projection, the majority of the on-state projection light from the modulator array passes through a region that is not centered in the projection lens pupil The blocked region of the asymmetric aperture is oriented toward the illumination path and away from the specular reflection path The asymmetric aperture is able to block a significant portion of the diffracted light using the blocked region, without blocking much of the desired projection light passing through the remainder of the aperture The result is that dark regions of the image become significantly darker, while light regions remain about the same The same effect occurs without offset illuminationread more
Citations
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Patent
Adaptive Illumination Modulator
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References
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Patent
System and method employing led light sources for a projection display
Fred Parker,Mark Peterson +1 more
TL;DR: In this article, a display controller (56) receives image data from a personal computer (58) and converts the data to color frame sequential data delivered to a common display device (44), the controller synchronizes the data with ON/OFF signals conveyed to an LED power supply.
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TL;DR: In this paper, a high contrast illumination system was proposed for use with light valves that have an array of reflective pivotable pixels and an asymmetric aperture is disposed in the light path with its longitudinal axis located along the pivot axis of the pixels.
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