Multi-zone EC windows
Thin-film devices, for example, multi-zone electrochromic windows, and methods of manufacturing are described. In certain cases, a multi-zone electrochromic window comprises a monolithic EC device on a transparent substrate and two or more tinting zones, wherein the tinting zones are configured for independent operation.
1. An electrochromic window lite comprising:
(i) a monolithic electrochromic device on a transparent substrate, the monolithic EC device comprising two transparent conductive oxide (TCO) layers; and
(ii) two or more tinting zones, each of said two or more tinting zones configured for operation independent of the others; and
(iii) a resistive zone between each of said two or more tinting zones, the resistive zone being a partial cut through the uppermost TCO layer of the two TCO layers.
2. The electrochromic window lite of claim 1 , wherein each of said two or more tinting zones comprises its own associated bus bars located at opposing edges for each of the two or more tinting zones.
3. The electrochromic window lite of claim 1 , wherein the electrochromic window lite is incorporated into an insulated glass unit (IGU).
4. The electrochromic window lite of claim 3 , wherein the IGU has a mate lite that is not an electrochromic lite.
5. The electrochromic window lite of claim 3 , wherein the IGU has a mate lite that is a monolithic electrochromic lite with a single tinting zone.
6. The electrochromic window lite of claim 3 , wherein the IGU has a mate lite that is a monolithic electrochromic lite with two or more tinting zones.
7. The electrochromic window lite of claim 6 , configured to tint in any one or more tinting zones to <1% T.
8. The electrochromic window lite of claim 1 , wherein the resistive zone substantially spans across the width of the monolithic electrochromic device.
9. The electrochromic window lite of claim 1 , wherein the resistive zone is between about 1 nm wide and about 10 nm wide.
10. The electrochromic window lite of claim 9 , wherein the resistive zone is formed by removing between about 10% and about 90% of the uppermost TCO layer along the resistive zone.
11. The electrochromic window lite of claim 10 , wherein the resistive zone is formed by laser irradiation of the uppermost TCO layer.
12. The electrochromic window lite of claim 2 , wherein each of said two or more tinting zones associated bus bars are formed by laser irradiation during formation of the resistive zone by cutting through a single bus bar.
13. A method of forming a monolithic electrochromic (EC) device comprising two tinting zones, the method comprising:
a) forming the monolithic EC device comprising two transparent conductive oxide (TCO) layers;
b) applying a single bus bar to the uppermost TCO layer of the two TCO layers of the monolithic EC device;
c) cutting through the single bus bar along its width; and
d) cutting at least part way through the uppermost TCO layer, but not entirely through the uppermost TCO and not through an electrode material layer adjacent to the uppermost TCO layer, to form a resistive zone between the two tinting zones;
wherein c) forms separate bus bars for each of the two tinting zones from the single bus bar.
14. The method of claim 13 , wherein c) and d) are performed in a single cutting step.
15. The method of claim 13 , wherein the resistive zone substantially spans the width of the monolithic EC device.
16. The method of claim 13 , wherein the resistive zone is between about 1 nm wide and about 10 nm wide.
17. The method of claim 13 , wherein the resistive zone is formed by removing between about 10% and about 90% of the uppermost TCO layer along the resistive zone.
18. The method of claim 17 , wherein the resistive zone is formed by laser irradiation of the uppermost TCO layer.
19. An electrochromic window lite comprising:
a transparent substrate having a viewable area;
an electrochromic device disposed on the viewable area of the transparent substrate;
a region of the viewable area that is not covered by the electrochromic device, said region capable of providing a bright spot or bright region when the electrochromic device is tinted; and
an obscuring material over the region of the viewable area that is not covered by the electrochromic device, wherein the obscuring material has a lower transmittance than the transparent substrate.
20. The electrochromic window lite of claim 19 , wherein the region of the viewable area that is not covered by the electrochromic device is a pinhole, a scribe line, or an edge line.
21. A method of obscuring a potentially bright area produced by a region of a viewable area of a transparent substrate that is not covered by an electrochromic device, the method comprising:
i. providing an electrochromic lite having the electrochromic device disposed on the viewable area of the transparent substrate;
ii. identifying a site of the region on the viewable area that is not covered by the electrochromic device; and
iii. applying an obscuring material to the region of the viewable area that is not covered by the electrochromic device;
wherein the obscuring material has a lower transmittance than the transparent substrate.
22. The method of claim 21 , wherein the region of the viewable area that is not covered by the electrochromic device is a pinhole, a scribe line, or an edge line.