Method for encapsulating at least one organic light-emitting (OLED) device and OLED device
View Patent ↗A method for encapsulating at least one organic light-emitting (OLED) device is disclosed. The method includes the step of forming a concave region on a plate by applying a negative pressure to a predetermined area of the plate. The plate is attached to a substrate including at least one active region such that the concave region of the plate spans over the active region.
1. A method for encapsulating at least one organic light-emitting (OLED) device, comprising the steps of:
preparing a substrate supporting at least one active region;
forming a concave region on a plate by applying a pressure below atmospheric pressure on a side of the plate which faces away from the substrate; and
attaching the plate to the substrate so that the concave region of the plate spans over the at least one active region.
2. The method according to claim 1 , wherein the plate is coated with at least one layer of material.
3. The method according to claim 2 , wherein the layer is applied to at least a part of the concave region of the plate.
4. The method according to claim 3 , wherein the layer is applied to the plate before forming the concave region.
5. The method according to claim 2 , wherein the layer comprises a chemical or physical getter material.
6. The method according to claim 2 , wherein the layer comprises at least one of Al, Ag, Mg, Ca, Ba, Zr, Ta, CaO and zeolite.
7. The method according to claim 1 , wherein the plate comprises at least one of metal and glass.
8. The method according to claim 1 , wherein the plate is between 0.05 and 0.4 mm thick.
9. The method according to claim 1 , wherein the plate is bonded to the substrate.
10. The method according to claim 9 , wherein the plate is bonded to the substrate by means of a bonding material.
11. The method according to claim 10 , wherein the bonding material is applied between plate and substrate.
12. The method according to claim 10 , wherein the bonding material comprises a getter material.
13. The method according to claim 10 , wherein the bonding material comprises spacer particles.
14. The method according to claim 10 , wherein the bonding material is thermally or UV-curable.
15. The method according to claim 14 , wherein during curing of the bonding material the plate and substrate are pressed together.
16. The method according to claim 15 , wherein the plate and substrate are pressed together by at least one load.
17. The method according to claim 16 , wherein the at least one load is applied to the surface of the substrate facing away from the active region such that the substrate is pressed on the plate.
18. The method according to claim 17 , wherein for each OLED device a concave region is formed on the plate, each concave region spanning over exactly one OLED device.
19. The method according to claim 17 , wherein in the region of each OLED device exactly one load is applied to the surface of the substrate facing away from the OLED device in order to press the substrate on the plate during curing of a bonding material which is applied between substrate and plate.
20. The method according to claim 10 , wherein the bonding material is cured by applying electromagnetic radiation to the bonding material.
21. The method according to claim 20 , wherein the electromagnetic radiation is focussed to be locally applied in regions where the bonding material is applied.
22. The method according to claim 20 , wherein the bonding material is cured by applying electromagnetic radiation in the infrared range to the bonding material.
23. The method according to claim 20 , wherein the bonding material is cured by applying electromagnetic radiation in the UV-range to the bonding material.
24. The method according to claim 10 , wherein the bonding material comprises at least one of epoxy adhesive, solder glass and silicon rubber.