PCAP touchscreens with a common connector
Some embodiments include fabricating a narrow border of a projected capacitive (PCAP) touchscreen. Some embodiments include a vertical electrode on a cover glass coupled to a first set of traces within the narrow border, and printing a first insulating black mask (BM) layer on the cover glass, that includes a first opening above an electrode terminus of the vertical electrode. Some embodiments further include printing a portion of a conductive black via (BV) in the first opening, coupling the conductive BV to the electrode terminus and a first silver trace of the first set of silver traces. Some embodiments include combining the cover glass with a sensor glass, where the first set of silver traces substantially overlaps a second set of silver traces of the sensor glass within the narrow border, where the overlapped sets of silver traces are separated by a shield layer.
1. A method for fabricating a projected capacitive (PCAP) touchscreen, comprising:
assembling a cover glass with a sensor glass, wherein a first set of silver traces of the cover glass overlap a second set of silver traces of the sensor glass, wherein the overlapped first and second sets of silver traces are separated by a shield layer and an insulation layer, wherein the overlap occurs within a border, and wherein the first and second sets of silver traces share a common connector; and
applying an adhesive between a first insulating black mask (BM) layer of the cover glass and the shield layer.
2. The method of claim 1 , further comprising:
disposing on the cover glass, a first transparent electrode;
printing a second insulating BM layer on the cover glass, wherein the second insulating BM layer includes a first opening above an electrode terminus of the first transparent electrode; and
printing a portion of a conductive black via (BV) in the first opening, wherein the portion of the conductive BV is coupled to the electrode terminus and coupled to a first silver trace of the first set of silver traces.
3. The method of claim 2 , further comprising:
printing a silver paste on the portion of the conductive BV and on the second insulating BM layer where transmitter and receiver silver traces are desired; and
using a laser to ablate excess silver paste.
4. The method of claim 3 wherein the using the laser to ablate the excess silver paste comprises:
leaving a deposit of the silver paste within a boundary of the portion of the conductive BV wherein the deposit is coupled to the first silver trace; and
defining remaining silver traces of the first set of silver traces.
5. The method of claim 3 , wherein the using the laser to ablate the excess silver paste comprises:
creating a gap through the silver paste and the second insulating BM layer to the cover glass, wherein the first insulating BM layer fills the gap.
6. The method of claim 5 , further comprising:
printing the first insulating BM layer that covers the first set of silver traces except a second opening that exposes leads of the first set of silver traces to be coupled with the common connector.
7. The method of claim 1 , further comprising:
disposing on the sensor glass, a second transparent electrode;
printing a second silver paste on the sensor glass where transmitter and receiver silver traces are desired; and
using a laser to ablate excess second silver paste.
8. The method of claim 7 , further comprising printing the insulation layer to substantially overlap the second set of silver traces within the border, wherein the shield layer is printed on the insulation layer.
9. The method of claim 8 , wherein the printing the second silver paste on the sensor glass comprises printing a ground silver trace; and wherein the printing the insulation layer comprises printing the insulation layer around a second opening that exposes the ground silver trace to the shield layer.
10. The method of claim 1 , wherein the adhesive is a solid optically clear adhesive (OCA) comprising: an acrylic-based adhesive, a silicone-based adhesive, polyvinyl butyral (PVB), or ethylene-vinyl acetate (EVA).
11. A projected capacitive (PCAP) touchscreen, comprising:
a cover glass assembled with a sensor glass, wherein a first set of silver traces of the cover glass overlap a second set of silver traces of the sensor glass, wherein the overlapped first and second sets of silver traces are separated by a shield layer and an insulation layer, wherein the overlap occurs within a border of the PCAP touchscreen, and wherein the first and second sets of silver traces share a common connector; and
an adhesive applied between a first insulating black mask (BM) layer of the cover glass and the shield layer.
12. The PCAP touchscreen of claim 11 , further comprising:
the cover glass comprising a first transparent electrode;
a second insulating black mask (BM) layer on the cover glass, wherein the second insulating BM layer includes a first opening above an electrode terminus of the first transparent electrode; and
a portion of a conductive black via (BV) in the first opening, wherein the portion of the conductive BV is coupled to the electrode terminus and coupled to a first silver trace of the first set of silver traces.
13. The PCAP touchscreen of claim 12 , further comprising:
a silver paste printed on the portion of the conductive BV and on the second insulating BM layer where transmitter and receiver silver traces are desired; and
excess silver paste ablated by a laser.
14. The PCAP touchscreen of claim 13 , wherein the laser ablation of the excess silver paste comprises:
a deposit of the silver paste within a boundary of the portion of the conductive BV wherein the deposit is coupled to the first silver trace; and
remaining silver traces of the first set of silver traces.
15. The PCAP touchscreen of claim 13 , wherein the laser ablation of the excess silver paste comprises:
a gap through the silver paste and the first insulating BM layer to the cover glass, wherein the first insulating BM layer fills the gap.
16. The PCAP touchscreen of claim 15 , wherein the first insulating BM layer covers the first set of silver traces except a second opening that exposes leads of the first set of silver traces to be coupled with the common connector.
17. The PCAP touchscreen of claim 11 , further comprising:
the sensor glass parallel to the cover glass, comprising a second transparent electrode coupled to a second silver trace of the second set of silver traces;
a second silver paste printed on the sensor glass where transmitter and receiver silver traces are desired; and
excess second silver paste ablated by a laser.
18. The PCAP touchscreen of claim 17 , further comprising the insulation layer printed to substantially overlap the second set of silver traces within the border of the PCAP touchscreen, wherein the shield layer is printed on the insulation layer.
19. The PCAP touchscreen of claim 18 , wherein the silver paste printed on the sensor glass comprises a ground silver trace; and wherein the insulation layer is printed around a second opening that exposes the ground silver trace to the shield layer.
20. The PCAP touchscreen of claim 11 , wherein the adhesive is a solid optically clear adhesive (OCA) comprising: an acrylic-based adhesive, a silicone-based adhesive, polyvinyl butyral (PVB), or ethylene-vinyl acetate (EVA).