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US 6,661,559 B2Granted
Electrochromic media for producing a preselected color and devices comprising same
AssigneeGentex Corporation
InventorsHarlan J. Byker, Thomas F. Guarr, Derick D. Winkle
Life of this patent
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Abstract
Electrochromic compositions suitable for use in electrochromic media in electrochromic devices contain minimally two electrochromic compounds of the same redox type, whose redox potentials are greater than 30 mV. The lower redox potential electrochromic compounds makes a large contribution to the absorbancy of the electrochromic medium despite being present in only minor concentration.
Claims12
An electrochromic device, comprising:
- a first substantially transparent substrate having an electrically conductive material associated therewith;
- a second substrate having an electrically conductive material associated therewith;
- and
- an electrochromic medium contained within a chamber positioned between the first and second substrates which comprises:
- at least one solvent;
- a first electroactive compound;
- a second electroactive compound;
- a third electroactive compound;
- wherein at least two of the first, second, and third electroactive compounds are electrochromic;
- wherein at least two of the first, second, and third electroactive compounds are of the same redox type;
- and
- wherein at least two of the first, second, and third electroactive compounds cooperatively interact to, in turn, generate an electrochromic medium having a preselected color.
9 more elements
An electrochromic device, comprising:
- a first substantially transparent substrate having an electrically conductive material associated therewith;
- a second substrate having an electrically conductive material associated therewith;
- and
- an electrochromic medium contained within a chamber positioned between the first and second substrates which is capable of producing a preselected color comprising at least three electroactive compounds, two of which are of the same redox type and another which is of a complementary redox type, where one of the two electroactive compounds of the same redox type has a more easily accessible electrochemically activated redox state than the other by minimally 20 mV, and where two of the at least three electroactive compounds are electrochromic.
1 more element
An electrochromic device, comprising:
- a first substantially transparent substrate having an electrically conductive material associated therewith;
- a second substrate having an electrically conductive material associated therewith;
- and
- an electrochromic medium contained within a chamber positioned between the first and second substrates which comprises:
- at least one solvent;
- a first electroactive compound;
- a second electroactive compound;
- a third electroactive compound;
- wherein at least two of the first, second, and third electroactive compounds are electrochromic;
- wherein at least two of the first, second, and third electroactive compounds are of the same redox type;
- and
- means associated with the medium for controllably preselecting the color of the electrochromic medium with first, second, and third electroactive compounds.
9 more elements
Dependencies are inferred from the claim text.