Ink delivery systems and methods

1. A method for printing a substrate, the method comprising:

positioning a substrate within an enclosure enclosing a printing system, wherein the printing system comprises a printhead device assembly comprising at least one printhead;

performing a printing process on the substrate, wherein the printing process comprises:

supplying ink from a local ink dispensing reservoir to the printhead device assembly, the local ink dispensing reservoir located inside the enclosure,

supplying ink from a local ink replenishment reservoir to the local ink dispensing reservoir so as to maintain, in the local ink dispensing reservoir, a level of ink within a first predetermined range, the local ink dispensing reservoir located inside the enclosure,

supplying ink from a bulk ink delivery system, through a fluid line disposed inside an outer conduit, and to the local ink replenishment reservoir so as to maintain, in the local ink replenishment reservoir, a level of ink within a second predetermined range, the bulk ink delivery system located outside the enclosure, and

depositing ink from the at least one printhead on the substrate.

2. The method of claim 1 , wherein supplying ink from the local ink replenishment reservoir to the local ink dispensing reservoir comprises supplying ink from the local ink replenishment reservoir to the local ink dispensing reservoir when the level of ink in the local ink dispensing reservoir falls below a first predetermined lower level of the first predetermined range.

3. The method of claim 2 , wherein supplying ink from the bulk ink delivery system to the local ink replenishment reservoir comprises supplying ink from the bulk ink delivery system to the local ink replenishment reservoir when the level of ink in the local ink replenishment reservoir falls below a second predetermined lower level of the second predetermined range.

4. The method of claim 1 , wherein:

the printhead device assembly comprises a plurality of printheads including the at least one printhead, and

supplying ink from the local ink dispensing reservoir to the printhead device assembly comprises supplying ink from the local ink dispensing reservoir to a printhead device assembly supply manifold operably coupled to the plurality of printheads.

5. The method of claim 4 , wherein supplying ink from the local ink dispensing reservoir to the printhead device assembly supply manifold comprises supplying ink from an outlet line of the local ink dispensing reservoir to a plurality of supply manifold inlet lines.

6. The method of claim 5 , further comprising supplying ink from the plurality of supply manifold inlet lines to the plurality of printheads.

7. The method of claim 6 , further comprising directing a portion of the ink supplied to the plurality of printheads to a printhead device assembly return manifold.

8. The method of claim 7 , further comprising directing the portion of the ink from the printhead device assembly return manifold to a printhead device assembly output waste line fluidically coupled to the printhead device assembly return manifold through a plurality of return manifold outlet lines.

9. The method of claim 1 , further comprising directing waste ink not deposited on the substrate in performing the printing process to a bulk waste assembly located outside the enclosure, wherein the outer conduit is fluidically coupled to the bulk waste assembly.

10. The method of claim 1 , wherein ink deposited from the at least one printhead comprises an organic material used to form a layer of an organic light emitting device (OLED).

11. The method of claim 1 , wherein depositing ink from the at least one printhead comprises depositing ink using at least one inkjet printhead.

12. The method of claim 1 , wherein depositing ink from the at least one printhead comprises depositing ink in a pattern on the substrate.

13. The method of claim 1 , further comprising maintaining a controlled environment in the enclosure while performing the printing process.

14. The method of claim 13 , wherein maintaining the controlled environment comprises maintaining an inert gas environment in the enclosure.

15. The method of claim 14 , wherein the inert gas environment comprises a gas chosen from nitrogen, any of the noble gases, and any combination thereof.

16. A method for printing a substrate, the method comprising:

positioning a substrate within an enclosure enclosing a printing system, wherein the printing system comprises a printhead device assembly comprising at least one printhead; and

performing a printing process on the substrate, wherein the printing process comprises:

depositing ink from the at least one printhead onto the substrate;

controlling a supply of ink to a local ink dispensing reservoir located in the enclosure and fluidically coupled to supply ink to the at least one printhead, the controlling the supply of ink to the local ink dispensing reservoir comprising:

in response to sensing a level of ink in the local ink dispensing reservoir is at or below a first predetermined lower level of a first predetermined range, supplying ink from a local ink replenishment reservoir to the local ink dispensing reservoir, the local ink replenishment reservoir located inside the enclosure, and

in response to sensing the level of ink in the local ink dispensing reservoir is at or above a first predetermined upper level of the first predetermined range, ceasing supplying ink from a local ink replenishment reservoir to the local ink dispensing reservoir.

17. The method of claim 16 , wherein the printing process further comprises:

controlling a supply of ink to the local ink replenishment reservoir, the controlling the supply of ink to the local ink replenishment reservoir comprising:

in response to sensing a level of ink in the local ink replenishment reservoir is at or below a second predetermined lower level of a second predetermined range, supplying ink from a bulk ink delivery reservoir to the local ink replenishment reservoir, the bulk ink delivery reservoir located outside the enclosure, and

in response to sensing the level of ink in the local ink replenishment reservoir is at or above a second predetermined upper level of the second predetermined range, ceasing supplying ink to the local ink replenishment reservoir from the bulk ink delivery reservoir.

18. The method of claim 16 , wherein:

the printhead device assembly comprises a plurality of printheads including the at least one printhead, and

supplying ink from the local ink dispensing reservoir to the at least one printhead comprises supplying ink from the local ink dispensing reservoir to the plurality of printheads.

19. The method of claim 18 , wherein supplying ink from the local ink dispensing reservoir to the plurality of printheads comprises supplying ink from an outlet line of the local ink dispensing reservoir to a plurality of supply manifold inlet lines fluidically coupled with the plurality of printheads.

20. The method of claim 16 , further comprising maintaining a controlled environment in the enclosure while performing the printing process.

21. The method of claim 20 , wherein maintaining the controlled environment comprises maintaining an inert gas environment in the enclosure.

22. The method of claim 21 , wherein the inert gas environment comprises a gas chosen from nitrogen, any of the noble gases, and any combination thereof.