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COMPOSITE VARIABLE LIGHT ATTENUATOR

  • US 20150323795A1
  • Filed: 05/06/2014
  • Published: 11/12/2015
  • Est. Priority Date: 05/06/2014
  • Status: Active Grant
First Claim
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1. An optical stack assembly, comprising:

  • a first variable element configured to vary light transmission through the first variable element as a function of a first control signal; and

    a second variable element in series with the first variable element and configured to vary light transmission through the second variable element as a function of a second control signal; and

    a controller to dynamically supply the first control signal to the first variable element and to supply the second control signal to the second variable element to achieve a greater range of light transmission than either the first variable element or the second variable element provide individually, while providing a switching speed between light transmission levels that is as fast as a switching speed of a faster of the first variable element and the second variable element.

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