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...

Examples

Embodiment Construction

[0042] This description is particularly aimed at components forming part of, or more directly cooperating with, the device according to the invention. It is to be understood that components not specifically shown or described may take the form known to those skilled in the art. form.

[0043] Studies have shown that the sensitivity of the human visual system to sinusoidal intensity oscillations decreases dramatically at higher temporal frequencies. See Kelly, D.H., "Visual Responses to Time-Dependent Stimuli: Measures of Amplitude Sensitivity", Journal of the Optical Society of America, Vol. 51, No. 4 , pp. 422; and Kelly, D.H., "Visual Responses to Time-Dependent Stimuli: III Specific Variations," Journal of the Optical Society of America, Vol. The range of -30 cycles / second is the largest, it drops rapidly above 30 cycles / second, and continues to decline with the increase of time frequency. For the time frequency above the cut-off frequency, there is basically no feeling of ...

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...

Examples

Embodiment Construction

[0042] This description is particularly aimed at components forming part of, or more directly cooperating with, the device according to the invention. It is to be understood that components not specifically shown or described may take the form known to those skilled in the art. form.

[0043] Studies have shown that the sensitivity of the human visual system to sinusoidal intensity oscillations decreases dramatically at higher temporal frequencies. See Kelly, D.H., "Visual Responses to Time-Dependent Stimuli: Measures of Amplitude Sensitivity", Journal of the Optical Society of America, Vol. 51, No. 4 , pp. 422; and Kelly, D.H., "Visual Responses to Time-Dependent Stimuli: III Specific Variations," Journal of the Optical Society of America, Vol. The range of -30 cycles / second is the largest, it drops rapidly above 30 cycles / second, and continues to decline with the increase of time frequency. For the time frequency above the cut-off frequency, there is basically no feeling of ...

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