Modular printhead for OLED printing
View Patent ↗The disclosure generally relates to a modular printhead configured for ease of access and quick replacement of the printhead. In one embodiment, the disclosure is directed to an integrated printhead which includes: a printhead die supporting a plurality of micropores thereon; a support structure for supporting the printhead die; a heater interposed between the printhead die and the support structure; and an electrical trace connecting the heater to a supply source. The support structure accommodates the electrical trace through a via formed within it so as to form a solid state printhead containing all of the connections within and providing easily replaceable printhead.
1. An integrated printhead, comprising:
a printhead die supporting a plurality of micropores thereon;
a support structure for supporting the printhead die;
a heater on the printhead die interposed between the printhead die and the support structure; and
an electrical trace connecting the heater to a supply source;
wherein the support structure accommodates the electrical trace through a via formed therethrough.
2. The printhead of claim 1 , wherein the at least one micropore defines a blind micropore.
3. The printhead of claim 1 , wherein the support structure comprises a ceramic material.
4. The printhead of claim 1 , wherein the heater is linearly disposed over a proximal surface of the printhead die and the plurality of micropores are disposed on the distal surface of the printhead die.
5. The printhead of claim 4 , wherein the distal surface of the printhead define a flatness tolerance of about 5-10 micron.
6. The printhead of claim 1 , further comprising a complementary electrical trace connecting the heater to a complementary supply source.
7. The printhead of claim 1 , wherein the integrated printhead die defines a device excluding external wiring.
8. The printhead of claim 1 , wherein the printhead die further comprises a first trench forming a cavity through the printhead die.
9. The printhead of claim 1 , further comprising at least one connection joint for connecting the support structure to at least one heater on the printhead die.
10. The printhead of claim 9 , wherein the connection joint comprises at least one of a solder bump, a package pad or an under-bump metal (UMB).
11. A printhead for printing OLED on a substrate, comprising:
a printhead die having a proximal surface and a distal surface, the distal surface defining a plurality of micropores;
a heater in thermal communication with the proximal surface of the printhead die; and
a support structure for supporting the printhead die, the support structure providing a trace for connecting the heater to a supply source;
wherein the printhead die in combination with the heater and the support structure form a solid state printhead, and wherein the distal surface of the printhead die defines a flatness tolerance of less than 20 micron.
12. The printhead of claim 11 , wherein the printhead die defines a flatness tolerance of less than 10 micron.
13. The printhead of claim 11 , wherein the printhead die has defines a flatness tolerance in a range of about 5-10 micron.
14. The printhead of claim 11 , wherein at least one of the plurality of micropore define blind micropore.
15. The printhead of claim 11 , wherein the support structure comprises a ceramic material.
16. The printhead of claim 11 , the trace comprises a connection for connecting the heater to the supply source.
17. The printhead of claim 11 , wherein the printhead die further comprises a first trench forming a cavity through the printhead die.
18. The printhead of claim 11 , further comprising a connection joint for connecting the support structure to the heater.
19. The printhead of claim 18 , wherein the connection joint comprises at least one of a solder bump, a package pad or an under-bump metal (UMB).
20. The printhead of claim 18 , wherein the connection joint receives the trace.
21. The printhead of claim 11 , wherein the printhead is positioned not more than about 40 microns from the substrate at printing.