Obscuring bus bars in electrochromic glass structures
Embodiments described include bus bars for electrochromic or other optical state changing devices. The bus bars are configured to color match and/or provide minimal optical contrast with their surrounding environment in the optical device. Such bus bars may be transparent bus bars.
1. An electrochromic glass structure, comprising:
a substantially transparent substrate;
an electrochromic device coating disposed on the substantially transparent substrate, the electrochromic device coating having one or more transparent conductive layers;
a bus bar configured to power the electrochromic device; and
a strip of obscuration material aligned substantially parallel to a length of the bus bar, the strip of obscuration material located on a surface of the electrochromic glass structure between the bus bar and an exterior environment to the electrochromic glass structure, wherein the strip of obscuration material covers only a portion at the perimeter of the electrochromic glass structure proximate the bus bar.
2. The electrochromic glass structure of claim 1 , wherein the strip of obscuration material has at least a width configured to block view of the bus bar from an observer viewing through the substantially transparent substrate.
3. The electrochromic glass structure of claim 2 , wherein the strip of obscuration material has a width that is greater than a width of the bus bar.
4. The electrochromic glass structure of claim 1 , wherein the strip of obscuration material is on an outer surface of the substantially transparent substrate.
5. The electrochromic glass structure of claim 4 , wherein the strip of obscuration material is a thin flexible material adhered to the outer surface of the substantially transparent substrate with an adhesive.
6. The electrochromic glass structure of claim 5 , wherein the thin flexible material is anodized aluminum.
7. The electrochromic glass structure of claim 1 , wherein the strip of obscuration material is located in a region between the bus bar and the substantially transparent substrate.
8. The electrochromic glass structure of claim 1 , wherein the strip of obscuration material is located between an outer surface of the substantially transparent substrate and a surface of another substrate that is laminated to the outer surface of the substantially transparent substrate.
9. The electrochromic glass structure of claim 1 , wherein the strip of obscuration material comprises one or more of a paint, a polymeric coating, a tape, a metal strip, a foil, and a shim stock.
10. The electrochromic glass structure of claim 1 , wherein the strip of obscuration material is a frit on a surface of the substantially transparent substrate.
11. The electrochromic glass structure of claim 1 , wherein the strip of obscuration material is applied by one of screen printing, spraying, and ink jet printing.
12. The electrochromic glass structure of claim 8 , wherein the strip of obscuration material is in or part of a lamination adhesive between the substantially transparent substrate and the other substrate.
13. The electrochromic glass structure of claim 8 , wherein the strip of obscuration material is on a surface of the other substrate.
14. An insulated glass unit comprising:
first and second substantially transparent substrates;
a spacer between the first and second substantially transparent substrates;
a primary seal between the spacer and the first substantially transparent substrate and between the spacer and the second substantially transparent substrate;
an electrochromic device on at least one of the first and second substantially transparent substrates; and
a bus bar associated with the electrochromic device and located under the spacer and in the primary seal, wherein the bus bar is located under the spacer and in the primary seal; and
a strip of obscuration material aligned substantially parallel to a length of the bus bar, the strip of obscuration material located on a surface of one of the first and second substantially transparent substrates between the bus bar and a region outside the insulated glass unit, wherein the strip of obscuration material covers only a portion at the perimeter of the insulated glass unit proximate the bus bar.
15. The insulated glass unit of claim 14 , wherein the strip of obscuration material has at least a width configured to block view of the bus bar from an observer viewing through the one of the first and second substantially transparent substrates.
16. The insulated glass unit of claim 15 , wherein the strip of obscuration material has a width that is greater than a width of the bus bar.
17. The insulated glass unit of claim 14 , wherein the strip of obscuration material is on an outer surface of the one of the first and second substantially transparent substrates.
18. The insulated glass unit of claim 17 , wherein the strip of obscuration material is a thin flexible material adhered to the outer surface of the one of the first and second substantially transparent substrates with an adhesive.
19. The insulated glass unit of claim 14 , wherein the strip of obscuration material is located in a region between the bus bar and the one of the first and second substantially transparent substrates.
20. The insulated glass unit of claim 14 , wherein the strip of obscuration material is located between an outer surface of the one of the first and second substantially transparent substrates and a surface of another substrate laminated to the outer surface of the one of the first and second substantially transparent substrates.
21. The insulated glass unit of claim 14 , wherein the strip of obscuration material comprises one or more of a paint, a polymeric coating, a tape, a metal strip, a foil, and a shim stock.
22. The insulated glass unit of claim 14 , wherein the strip of obscuration material is a frit on the surface of the one of the first and second substantially transparent substrate.
23. The insulated glass unit of claim 14 , wherein the strip of obscuration material is applied by one of screen printing, spraying, and ink jet printing.
24. The insulated glass unit of claim 14 , wherein the strip of obscuration material is laminated between the one of the first and second substantially transparent substrates and another substrate.
25. The insulated glass unit of claim 24 , wherein the strip of obscuration material is in or part of a lamination adhesive.
26. The insulated glass unit of claim 14 , wherein the bus bar is configured to have minimal optical contrast with the primary seal and/or the spacer.
27. The insulated glass unit of claim 26 , wherein the bus bar is made of an electrically conductive material comprising a tinting agent configured to approximate a color of the background to the primary seal and/or the spacer.
28. The insulated glass unit of claim 27 , wherein the tinting agent comprises carbon black, graphite and/or graphene.
29. The insulated glass unit of claim 14 , wherein the bus bar comprises a thin layer of metal or metal alloy.
30. The insulated glass unit of claim 14 , wherein the bus bar comprises silver nanowires or conductive carbon nanotubes.
31. The insulated glass unit of claim 14 , wherein the bus bar comprises a non-metallic and conductive material.