DEVICES AND METHODS FOR ACHIEVING NON-CONTACTING WHITE STATE IN INTERFEROMETRIC MODULATORS
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United States of America Patent
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Issued Date -
Aug 7, 2014
app pub date -
Jan 31, 2014
filing date -
May 4, 2011
priority date (Note) -
Abandoned
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Abstract
This disclosure provides systems, methods and apparatus for providing white light color output from an electromechanical systems (EMS) device with reduced likelihood of stiction. In one aspect, interferometric modulators are configured to provide a white color output while having a non-zero modulator gap dimension. Such a feature can reduce problems associated with zero modulator gap dimensions such as stiction. Various methodologies can be used to yield such a non-zero modulator gap and a white color output. In some implementations, for example, an optical element that introduced wavelength dependent phase shift is used. In some implementations this wavelength dependent phase shifting optical element includes a stack of color filters, a hologram, a diffraction grating, or layers of material having specific thicknesses and wavelength dependent indices of refraction.
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