Method and apparatus for load-locked printing
View Patent ↗The disclosure relates to a method and apparatus for preventing oxidation or contamination during a circuit printing operation. The circuit printing operation can be directed to OLED-type printing. In an exemplary embodiment, the printing process is conducted at a load-locked printer housing having one or more of chambers. Each chamber is partitioned from the other chambers by physical gates or fluidic curtains. A controller coordinates transportation of a substrate through the system and purges the system by timely opening appropriate gates. The controller may also control the printing operation by energizing the print-head at a time when the substrate is positioned substantially thereunder.
1. A printing system comprising:
at least one print-head;
a housing comprising a sealable print-head chamber enclosing the at least one print head, the print-head chamber disposed between a sealable inlet chamber and a sealable outlet chamber, the print-head chamber configured to be sealed prior to deposition of a quantity of organic material onto the substrate;
an inlet sealing partition and an outlet sealing partition disposed in communication with said print-head chamber, the sealing partitions adapted for receiving and dispatching the substrate, respectively;
an inert gas input in communication with the print-head chamber, the inert gas input configured to provide an inert gas environment within the print-head chamber;
a floatation system configured to floatingly support the substrate in and through the chambers, the floatation system comprising a plurality of fluid nozzles configured for floating support of the substrate via a plurality of inlet pressure ports and vacuum outlet ports while the print head delivers the quantity of organic material onto the substrate; and
a controller in communication with the print head, the chambers, the partitions, and the floatation system, the controller configured to:
operate the inlet sealing partition such that the substrate can be transported into the print-head chamber,
energize the print-head to deposit the quantity of the material onto the substrate when the substrate is at a controlled height in the print-head chamber via control of pressure inlet and vacuum outlet ports of the floatation system, and
operate the outlet sealing partition such that the substrate can be transported from the print-head chamber.
2. The printing system of claim 1 , wherein the inert gas is chosen from argon, nitrogen, and helium.
3. The printing system of claim 2 , wherein the inert gas comprises nitrogen.
4. The printing system of claim 1 , wherein the at least one print head comprises a plurality of print-heads.
5. The printing system of claim 4 , wherein the plurality of print-heads are arranged in an array.
6. The printing system of claim 1 , further comprising an alignment system for detecting and aligning a substrate provided within printing system.
7. The printing system of claim 1 , wherein the organic material comprises liquid ink.
8. The printing system of claim 7 , further comprising a piezoelectric device adapted for activating the print-head to deliver the liquid ink from the print-head.