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Color dependent aperture stop

A color and aperture technology, applied in the field of lighting systems, can solve problems such as small features and changes in the diffraction behavior of DMD devices

Active Publication Date: 2014-12-17
IMAX THEATERS INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Although projectors, including digital cinema projectors, using digital micromirror devices from Texas Instruments are used commercially, it is not widely recognized that the diffractive behavior of DMD devices has changed as features have become smaller up
When such devices are used for narrow-band light sources, including lasers, diffraction effects become increasingly important, and it is no longer sufficient to treat these micromirrors as simple reflective devices

Method used

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  • Color dependent aperture stop
  • Color dependent aperture stop
  • Color dependent aperture stop

Examples

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Embodiment Construction

[0033] figure 1 is a block diagram representing an example of an optical system that could benefit from the use of CDA. Light source 100 may have more than one wavelength. Illumination system 104 may emit light to form a uniform spot onto component 108, which may be a spatial light modulator (SLM), for example, in a projection system. Component 108 can alter the angular distribution (ie, operating f-number) for at least one wavelength band of light used by the optical system. The operating f-number of projection optics 112 may no longer match the operating f-number of illumination system 104 for all wavelength bands of light. CDA 116 may be configured in the projection lens such that the operating f-number of the projection optics is matched to each of the different angular distributions of light bands received from component 108 .

[0034] figure 2 A CDA 200 is shown configured to create a small optical device operating f-number for red light relative to other light ban...

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Abstract

Optical systems are provided that include illumination sources, micro-mirror array optical modulators, and an optical element. The micro-mirror array optical modulators can selectively modulate light beams, redirect light by diffraction and reflection, and provide an output modulated light beam that exhibits a diffraction handedness dependent on the spectral bandwidth of the light incident thereupon. The optical element has a color dependent aperture that defines portions of output modulated light beams that are transmitted and remaining portions that are blocked. An efficiency and contrast of each the output modulated light beams acquired by the optical element can be independently determined by a narrow spectral bandwidth of each of the light beams, the spectral characteristics of the color dependent aperture, and the diffraction handedness of the micro-mirror array optical modulators for the associated spectral bandwidth.

Description

[0001] Cross References to Related Applications [0002] Priority is claimed to US Provisional Patent Application 61 / 686,318, filed April 3, 2012, entitled "Color Dependent Aperture Stop," which is hereby incorporated by reference in its entirety. [0003] The present invention is related to International Patent Application No. PCT / ____________ [Attorney Docket No. I0002 / 869626] entitled "Projector Optimized for Modulator Diffraction Effects" filed concurrently with the present invention. technical field [0004] The present invention relates generally to systems and methods for cinematic display, and more particularly, though not necessarily exclusively, to a projection lens having the size and shape of an aperture stop and an illumination system having the size and shape of the aperture stop, wherein the two Either or both may vary in size or shape as a function of wavelength. Background technique [0005] In optical design, one optical system may follow another optical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B5/00G03B21/14H04N9/31G02B26/08
CPCG02B5/005G02B26/0833G02B27/0018H04N9/3152G03B9/02G03B21/005G03B21/206H04N9/3161G03B21/20G02B5/20G02B26/0808G03B21/008
Inventor J·鲍伦S·C·雷德A·F·库尔茨
Owner IMAX THEATERS INT