Projector with enhanced security camcorder defeat

Abstract

A projector (10) with enhanced security camcorder defeat including a copy protection illumination system (1) for illuminating a spatial light modulator (30) comprises: a polychromatic light source (20); uniformizing optics (22) for homogenizing light from the polychromatic light source to provide a uniform illumination field; relay optics; dichroic optics; an interference modulation element (5) located at a plane in an optical path located between the polychromatic light source and the spatial light modulator; and a detection means for determining the absence of the interference modulation element.

Description

technical field

[0001] The present invention relates generally to a projection apparatus that utilizes a spatial light modulator to form a color image from digital data, and more particularly to the anti-counterfeiting capability that the projection apparatus enables to achieve while maintaining the source illumination and the telecentric optical path of the modulated light . Background technique

[0002] In order to be considered a suitable replacement for conventional film projectors, a digital projection system must meet the required requirements with respect to image quality. This is especially true for multicolor film projection systems. In order to provide a competing alternative to conventional film-quality projection , digital projectors must meet high performance standards to provide high resolution, wide color gamut, high brightness, and a contrast ratio of more than 1000:1 frame-to-plane sequence. In addition to these requirements, some steps need to be taken to e...

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