Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1999-02-24
2000-07-04
Epps, Georgia
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359265, G02F 1153, G02F 115
Patent
active
060847018
ABSTRACT:
Tin oxide doped with an electrochromically effective amount of a metal, e.g. antimony or niobium, which provides a color change when the doped tin oxide is exposed to an electrochemical potential in the presence of mobile ions. Particles of electrochromic doped tin oxide, e.g. coated on a white or pastel pigment substrate, have a contrast ratio greater than 1.2, where contrast ratio is a measure of electrochromic functionality of a material and is the ratio of reflectance of the material in an oxidized state to the color of the material in a reduced state and where color is a photodiode measurement of the value of light reflected off the oxidized or reduced material from a constant source of light shining on the material. Such doped tin oxide-containing particles are useful as electrochromic material in display devices.
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Epps Georgia
Monsanto Company
Spector David N.
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