ESD protection mechanism for an HVAC controller
View Patent ↗An electronic sub-assembly for an HVAC Controller includes a touch screen display and a printed circuit board. The touch screen display including a viewing side and a non-viewing side. A conductive trace is disposed on the viewing side of the touch screen display adjacent a perimeter of the touch screen display. The printed circuit board, which includes a grounding feature, is positioned adjacent the non-viewing side of the touch screen display. A connector is in electrical communication with the conductive trace and the grounding feature of the printed circuit board.
1. An electronic assembly, comprising:
a touch screen display having a viewing side and an opposing non-viewing side;
a connector extending from the touch screen display and electrically connecting the touch screen display to a printed circuit board, wherein the printed circuit board is positioned adjacent the non-viewing side of the touch screen display;
a frame releasably connecting the printed circuit board and the touch screen display;
a conductive trace extending at least substantially around the viewing side of the touch screen display, wherein the conductive trace is in electrical communication with the printed circuit board via the connector;
wherein the conductive trace is configured to collect Electro-Static Discharge (ESD) entering from the viewing side of the touch screen display, and to deliver the collected ESD to the printed circuit board via the connector; and
a layer over at least part of the conductive trace, wherein at least part of the conductive trace is exposed toward the viewing side of the touch screen display at one or more ESD collection sites.
2. The electronic assembly of claim 1 , wherein the touch screen display includes a foil layer, and the conductive trace is applied over the foil layer.
3. The electronic assembly of claim 1 , wherein the touch screen display comprises a plurality of holes spaced inward from an edge of the touch screen display and through at least part of the touch screen display down to the conductive trace.
4. The electronic assembly of claim 1 , wherein:
the conductive trace has a first portion extending substantially around the viewing side of the touch screen display and spaced from an outer edge of the touch screen display; and
the conductive trace further having a second portion that includes a plurality of strips spaced from one another and extending from the first portion toward the outer edge of the touch screen display.
5. The electronic assembly of claim 2 , wherein the foil layer and the conductive trace are both spaced inward from an outer edge of the touch screen display.
6. An electronic assembly, comprising:
a touch screen display having a viewing side and an opposing non-viewing side;
a connector extending from the touch screen display and electrically connecting the touch screen display to a printed circuit board, wherein the printed circuit board is positioned adjacent the non-viewing side of the touch screen display;
a frame releasably connecting the printed circuit board and the touch screen display;
a conductive trace extending at least substantially around the viewing side of the touch screen display, wherein the conductive trace is in electrical communication with the printed circuit board via the connector; and
wherein the touch screen display includes a foil layer, and the conductive trace is applied over the foil layer.
7. The electronic assembly of claim 6 , wherein the foil layer and the conductive trace are both spaced inward from an outer edge of the touch screen display.
8. An electronic assembly, comprising:
a touch screen display having a viewing side and an opposing non-viewing side;
a connector extending from the touch screen display and electrically connecting the touch screen display to a printed circuit board, wherein the printed circuit board is positioned adjacent the non-viewing side of the touch screen display;
a frame releasably connecting the printed circuit board and the touch screen display;
a conductive trace extending at least substantially around the viewing side of the touch screen display, wherein the conductive trace is in electrical communication with the printed circuit board via the connector; and
wherein the touch screen display comprises a plurality of holes spaced inward from an edge of the touch screen display and through at least part of the touch screen display down to the conductive trace.
9. An electronic assembly, comprising:
a touch screen display having a viewing side and an opposing non-viewing side;
a connector extending from the touch screen display and electrically connecting the touch screen display to a printed circuit board, wherein the printed circuit board is positioned adjacent the non-viewing side of the touch screen display;
a frame releasably connecting the printed circuit board and the touch screen display;
a conductive trace extending at least substantially around the viewing side of the touch screen display, wherein the conductive trace is in electrical communication with the printed circuit board via the connector; and
wherein:
the conductive trace has a first portion extending substantially around the viewing side of the touch screen display and spaced from an outer edge of the touch screen display; and
the conductive trace further having a second portion that includes a plurality of strips spaced from one another and extending from the first portion toward the outer edge of the touch screen display.