Inkjet printing apparatus and method for aligning dipoles

1. An inkjet printing apparatus comprising:

a frame;

an inkjet head disposed on the frame;

a first probe disposed on the frame, disposed at a side of the inkjet head, and providing a first voltage to a substrate, the first probe movable in electrical contact with the substrate; and

a second probe disposed on the frame, disposed at another side of the inkjet head, and providing a second voltage to the substrate, the second probe movable in electrical contact with the substrate.

2. The inkjet printing apparatus of claim 1 , wherein

the first voltage has a first polarity, and

the second voltage has a second polarity opposite the first polarity.

3. The inkjet printing apparatus of claim 2 , further comprising:

an electric field generation device that generates the first voltage and the second voltage,

wherein the frame includes a line providing the first voltage to the first probe and the second voltage to the second probe.

4. The inkjet printing apparatus of claim 1 , wherein each of the first probe and the second probe has a rotatable roller shape.

5. The inkjet printing apparatus of claim 1 , further comprising:

a stage disposed under the inkjet head.

6. The inkjet printing apparatus of claim 5 , further comprising:

a stage moving part that moves the stage in a first direction.

7. The inkjet printing apparatus of claim 6 , wherein

each of the first probe and the second probe is rotatable,

extending directions of a rotational shaft of the first probe and a rotational shaft of the second probe are parallel to each other, and

the extending directions of the rotational shaft of the first probe and the rotational shaft of the second probe are in a second direction perpendicular to the first direction.

8. An inkjet printing apparatus comprising:

a stage; and

a print head part located above the stage, the print head part including:

a frame;

inkjet heads disposed on the frame;

first probe parts disposed on the frame disposed at first sides of the inkjet heads, and providing a first voltage to a substrate, the first probe parts movable in electrical contact with the substrate; and

second probe parts disposed on the frame disposed at second sides of the inkjet heads, and providing a second voltage to the substrate, the second probe parts movable in electrical contact with the substrate.

9. The inkjet printing apparatus of claim 8 , wherein

the first probe parts include at least one first probe having a rotatable roller shape, and

the second probe parts include at least one second probe having a rotatable roller shape.

10. The inkjet printing apparatus of claim 9 , wherein an extending direction of a rotational shaft of the first probe and an extending direction of a rotational shaft of the second probe are parallel to each other in a first direction.

11. The inkjet printing apparatus of claim 10 , further comprising:

a stage moving part that moves the stage in a second direction,

wherein the second direction and the first direction are perpendicular to each other.

12. The inkjet printing apparatus of claim 8 , wherein the first probe part includes at least one rotatable first probe driving part, and at least one first probe moving in a rotating direction of the first probe driving part.

13. The inkjet printing apparatus of claim 12 , wherein the first probe has a pin shape.

14. The inkjet printing apparatus of claim 8 , wherein each of the inkjet heads includes a nozzle that sprays an ink including dipoles.

15. A dipole alignment method comprising:

generating an electric field on a target substrate on which electrode pads extending in a first direction are formed;

spraying an ink including dipoles onto a region where the electric field is generated; and

seating the dipoles on the target substrate, wherein

the electric field is generated by a probe that is movable in electrical contact with the electrode pad.

16. The dipole alignment method of claim 15 , wherein

the probe is a rotatable probe, and

an extending direction of a rotational shaft of the probe is parallel to a second direction perpendicular to the first direction.

17. The dipole alignment method of claim 15 , wherein

the target substrate includes a first electrode and a second electrode; and

the seating of the dipoles includes seating the dipoles on the first electrode and the second electrode.

18. The dipole alignment method of claim 15 , wherein the generating of the electric field and spraying the ink includes aligning orientation directions of the dipoles by the electric field.

19. The dipole alignment method of claim 15 , wherein the generating of the electric field on the target substrate and spraying the ink is performed using an inkjet printing apparatus.

20. The dipole alignment method of claim 19 , wherein the inkjet printing apparatus includes:

a frame;

an inkjet head disposed on the frame; and

the probe including:

a first probe disposed at a side of the inkjet head and providing a first voltage; and

a second probe disposed on the frame, disposed at another side of the inkjet head, and providing a second voltage.