Display device manufacturing apparatus, method of manufacturing display device using the same, and display device manufactured by the same
A display device manufacturing apparatus includes a first reservoir accommodating a solvent; a second reservoir accommodating a light emitting element; a mix chamber accommodating an ink including the solvent and the light emitting element ; a first channel connecting the first reservoir and the mix chamber; a second channel connecting the second reservoir and the mix chamber; and a counter that obtains information on a number of the light emitting elements that are moved in the second channel.
1. A display device manufacturing apparatus comprising:
a first reservoir that accommodates a solvent;
a second reservoir that accommodates light emitting elements; and
a print head including:
a mix chamber that accommodates an ink including at least some of the solvent received from the first reservoir and one or more light emitting elements received from the second reservoir;
a first channel fluidically connecting the first reservoir and the mix chamber;
a second channel fluidically connecting the second reservoir and the mix chamber;
a counter that, in response to a flow of the one or more light emitting elements in the second channel, obtains information on a number of the one or more light emitting elements flowing through a portion of the second channel; and
an open and close unit fluidically disposed between the portion of the second channel and the mix chamber, the open and close unit being toggleable between an open state and a closed state based on the number of the one or more light emitting elements.
2. The display device manufacturing apparatus according to claim 1 , wherein, upstream of the mix chamber, the first channel and the second channel are fluidically isolated from each other.
3. The display device manufacturing apparatus according to claim 2 , wherein the first channel is a first manifold and the second channel is-ere a second manifold.
4. The display device manufacturing apparatus according to claim 2 , wherein
the first channel includes a first body channel and a first branch channel fluidically connected with the first body channel, the first branch channel being fluidically connected between the first body channel and the mix chamber, and
the second channel includes a second body channel and a second branch channel fluidically connected with the second body channel, the second branch channel being fluidically connected between the second body channel and the mix chamber.
5. The display device manufacturing apparatus according to claim 4 , wherein the counter is adjacent to the second branch channel.
6. The display device manufacturing apparatus according to claim 4 , further comprising:
a controller electrically connected to the counter, wherein
the portion of the second channel is a portion of the second branch channel, and
wherein the controller calculates a number of the one or more light emitting elements flowing through the portion of the second branch channel based on the information on the number of the one or more light emitting elements.
7. The display device manufacturing apparatus according to claim 4 , wherein
in a case that the open and close unit has the close state, the second branch channel and the mix chamber are fluidically isolated from one another, and
in a case that the open and close unit has the open state, the second branch channel and the mix chamber are fluidically connected with one another.
8. The display device manufacturing apparatus according to claim 7 , further comprising:
a controller communicatively coupled with the counter and the open and close unit,
wherein, as part of a print operation, the controller:
receives the information from the counter;
receives other information about an amount of light emitting elements to discharge per region of a same pixel; and
causes, at least in part, the open and close unit to toggle between the open state and the close state to dynamically adjust a number of light emitting elements forming the ink accommodated in the mix chamber based on the information and the other information.
9. The display device manufacturing apparatus according to claim 7 , further comprising:
a controller electrically connected to the counter and the open and close unit, wherein
in a case that the controller receives a first number signal from the counter corresponding to a first number of the one or more light emitting elements, the controller compares the first number with a threshold. and in response to the first number signal being smaller than the threshold, toggles the open and close unit from the closed state to the open state, and
in a case that the controller receives a second number signal different from the first number signal from the counter corresponding to a second number of the one or more light emitting elements, the controller compares the second number with the threshold, and in response to the second number being greater than or equal to the threshold, toggles the open and close unit from the open state to the close state.
10. The display device manufacturing apparatus according to claim 4 , wherein a cross-sectional area of the second branch channel differs according to a length direction of the second branch channel.
11. The display device manufacturing apparatus according to claim 1 , wherein the counter is at least one of an image analyzer, a counter performing a laser diffraction method, a counter performing a dynamic light scattering method, or a counter performing an electronic sensing method.
12. The display device manufacturing apparatus according to claim 1 , further comprising:
a nozzle, and
a controller electrically connected to the nozzle,
wherein the nozzle is fluidically connected to the mix chamber and discharges at least some of the ink accommodated in the mix chamber in response to a control signal from the controller.
13. The display device manufacturing apparatus according to claim 1 , further comprising:
a movement inducement unit that induces movement of the one or more light emitting elements in the second channel,
wherein, in a case that the one or more light emitting elements are to flow to the mix chamber, the movement inducement unit applies an external force toward the mix chamber to the one or more light emitting elements to cause, at least in part, the one or more light emitting elements to flow in the second channel to the mix chamber.
14. The display device manufacturing apparatus according to claim 13 , wherein the movement inducement unit is at least one of one or more electrodes that form an electric field in association with the portion of the second channel to orient the one or more light emitting elements and influence the flow of the one or more light emitting elements, an air flow generator that forms a flow of air in the second channel toward the mix chamber and influences the flow of the one or more light emitting elements, or an actuator disposed in the second channel and that applies the external force toward the mix chamber to the one or more light emitting elements to influence the flow of the one or more light emitting elements.
15. The display device manufacturing apparatus according to claim 1 , further comprising:
a controller communicatively coupled with the print head,
wherein the controller causes, at least in part, the print head to discharge at least some of the ink accommodated in the mix chamber on a region of a pixel-by-region of a pixel basis so that each region of a pixel receives a plurality of light emitting elements.
16. The display device manufacturing apparatus according to claim 1 , wherein an internal flow path of the second channel includes a surface treatment that mitigates generation of static electricity in association with the flow of the one or more light emitting elements in the second channel.
17. A display device manufacturing apparatus comprising:
a solvent reservoir:
a light emitting element reservoir;
a substrate stage: and
a print head overlving the substrate stage the print head including:
a first mix chamber fluidically connected with the solvent reservoir;
a second mix chamber fluidically connected with the light emitting element reservoir and fluidically isolated from the first mix chamber within the print head;
a first channel fluidically connecting the solvent reservoir with the first mix chamber:
a second channel fluidically connecting the light emitting element reservoir with the second mix chamber:
a counter disposed in association with the second channel and upstream from the second mix chamber and that, in response to a flow of light emitting elements from the light emitting element reservoir via the second channel, obtains information about a number of the light emitting elements flowing in the second channel;
a first nozzle fluidically connected with the first mix chamber: and
a second nozzle fluidically connected with the second mix chamber.
18. The display device manufacturing apparatus according to claim 17 , further comprising:
a controller communicatively coupled with the print head, wherein
as part of a first print operation, the controller causes, at least in part, solvent to flow from the solvent reservoir to the first mix chamber, from the first mix chamber to the first nozzle, and from the first nozzle to a deposition position on the substrate stage,
as part of a second print operation different from the first print operation, the controller causes, at least in part, the light emitting elements to flow from the light emitting element reservoir to the second mix chamber, from the second mix chamber to the second nozzle, and from the second nozzle to the deposition position, and
the controller controls the print head to toggle between the first print operation and the second print operation to deposit and mix the solvent and the light emitting elements at the deposition position.
19. The display device manufacturing apparatus according to claim 18 , wherein
the light emitting element reservoir stores a fluid including light emitting elements, and
the controller causes, at least in part, the print head to dynamically adjust a ratio of light emitting elements to solvent at the deposition position without affecting a viscosity of the fluid flowing through the print head.