Flexible electronic circuits and displays including a backplane comprising a patterned metal foil having a plurality of apertures extending therethrough
A backplane for use in an electro-optic display comprises a patterned metal foil having a plurality of apertures extending therethrough, coated on at least side with an insulating polymeric material and having a plurality of thin film electronic devices provided on the insulating polymeric material.
1. A backplane for use in an electro-optic display, the backplane comprising a patterned metal foil having a plurality of apertures extending therethrough, coated on at least one side of the patterned metal foil with an insulating polymeric material and having a plurality of thin film electronic devices provided on the insulating polymeric material, whereby the insulating polymeric material separates the thin film electronic devices from the patterned metal foil.
2. A backplane according to claim 1 wherein the apertures are arranged on a rectangular grid.
3. A backplane according to claim 1 wherein the apertures occupy at least about 30 percent of the area of the patterned metal foil.
4. A backplane according to claim 3 wherein the apertures occupy at least about 60 percent of the area of the patterned metal foil.
5. A backplane according to claim 1 wherein the patterned metal foil is coated on both sides with an insulating polymeric material.
6. A backplane according to claim 5 wherein the patterned metal foil is coated on both sides with the same insulating polymeric material.
7. A backplane according to claim 5 wherein the patterned metal foil is coated on its two sides with different insulating polymeric materials.
8. A backplane according to claim 1 wherein each of the thin film electronic devices lies entirely within the area of one aperture in the metal foil.
9. A backplane according to claim 1 wherein each of the thin film electronic devices extends across a plurality of apertures in the metal foil.
10. An electro-optic display comprising a backplane according to claim 1 .
11. An electro-optic display according to claim 10 comprising an encapsulated electrophoretic electro-optic medium.
12. A backplane for use in an electro-optic display, the backplane comprising a metal foil coated on at least one side with an insulating polymeric material and having a plurality of thin film electronic devices provided on the insulating polymeric material, the backplane further comprising at least one conductive via extending through the polymeric material and the metal foil and electrically connecting at least one of the thin film electronic devices to the metal foil, wherein the metal foil serves as at least one of an antenna, an inductor loop, a power plane, a capacitor, a capacitor contact, a pixel electrode, and electromagnetic induction shielding.
13. An electro-optic display comprising a backplane according to claim 12 .
14. An electro-optic display comprising a backplane, the backplane comprising a metal foil coated on at least one side with an insulating polymeric material and having a plurality of thin film electronic devices provided on the insulating polymeric material, the backplane further comprising at least one conductive via extending through the polymeric material and the metal foil and electrically connecting at least one of the thin film electronic devices to the metal foil, the electro-optic display having the form a smart card, the metal foil serving to communication between the card and a card reading apparatus.