Manufacturing method for an electrowetting device

1. A method of providing a first fluid layer of a first fluid and a second fluid layer of a second fluid, the first fluid immiscible with the second fluid, the method comprising:

providing an emulsion of the first fluid and the second fluid through a medium which does not comprise the second fluid, the emulsion comprising an amount of the second fluid for forming the second fluid layer;

the emulsion contacting a first area of a support plate for an electrowetting device, the first area having a higher wettability for the first fluid than for the second fluid; and

the first fluid of the emulsion coalescing to form the first fluid layer on the first area such that the first fluid layer is formed less than: 20 minutes, 1 hour, 3 hours or 6 hours after the emulsion contacting the first area of the support plate.

2. The method according to claim 1 , the second fluid, upon the first fluid of the emulsion coalescing, separating from the first fluid and forming the second fluid layer.

3. The method according to claim 1 , the providing the emulsion comprising dispensing the emulsion from a dispenser and through the medium from the dispenser to the first area.

4. The method according to claim 1 , wherein the medium is a gaseous medium.

5. The method according to claim 1 , the providing the emulsion comprising providing the emulsion as a drop from an opening of a dispenser.

6. The method according to claim 5 , wherein the method of providing the first fluid layer and the second fluid layer is a one drop fill method.

7. The method according to claim 1 , the support plate being a first support plate, the method comprising:

providing a second support plate; and

coupling the second support plate to the first support plate to form a space between the first support plate and the second support plate, the space comprising the first fluid and the second fluid, the providing the emulsion comprising providing an amount of the emulsion substantially equal to a volume of the space.

8. The method according to claim 7 , the amount of the second fluid being a second amount, the first fluid layer comprising a first volume of the first fluid and the second fluid layer comprising a second volume of the second fluid, a first amount of the first fluid and the second amount in the emulsion being substantially equal, respectively, to the first volume and the second volume.

9. The method according to claim 7 , the coupling comprising sealing the first support plate to the second support plate with a sealing member.

10. The method according to claim 9 , comprising providing the sealing member on the first support plate before the emulsion contacting the first area.

11. The method according to claim 9 , comprising:

forming the space with an opening in one or more of: the sealing member, the first support plate or the second support plate;

the providing the emulsion comprising filling the space with the emulsion through the opening after the forming the space; and

closing the opening.

12. The method according to claim 7 , comprising performing the coupling after the emulsion contacting the first area.

13. The method according to claim 1 , the support plate being a first support plate, the method comprising:

preparing a sealing member;

applying the sealing member to one of the first support plate or a second support plate to form a seal pattern, one of the first support plate or the second support plate having electrodes and a surface with a hydrophobic interlayer thereon;

bonding the first support plate to the second support plate;

curing the sealing member to form a cell having an opening;

the providing the emulsion comprising preparing and injecting the emulsion into the cell through the opening; and

sealing the opening.

14. The method according to claim 13 , wherein the emulsion is an emulsion ink, the first fluid comprises a hydrophobic liquid and the second fluid comprises a hydrophilic liquid, the emulsion ink comprising the hydrophilic liquid and the hydrophobic liquid dispersed in the hydrophilic liquid, the electrodes being transparent and the applying the sealing member to the one of the first support plate or the second support plate being to form a frame-shaped seal pattern.

15. The method according to claim 13 , wherein the injecting is performed using one or more of: a pressure between 100 and 1000 mmHg or a syringe.

16. The method according to claim 1 , wherein the first area is surrounded by a second area having a higher wettability for the second fluid than for the first fluid, the emulsion comprising a portion of the second fluid which separates from the first fluid upon the coalescing and adjoins the second area.

17. The method according to claim 1 , wherein the support plate comprises a plurality of first areas, the plurality of first areas comprising the first area, and a plurality of electrodes, a respective electrode of the plurality of electrodes arranged within each of the plurality of first areas, and the second fluid is an electrolyte, the method comprising controlling the coalescing of the first fluid by applying a voltage between the emulsion and at least one electrode of the plurality of electrodes.

18. The method according to claim 1 , the second fluid comprising one or more of:

a compound for increasing interfacial tension between the first fluid and the second fluid, or

a salt for increasing interfacial tension between the first fluid and the second fluid.

19. The method according to claim 1 , wherein in the emulsion the first fluid is dispersed as droplets in the second fluid.

20. The method according to claim 1 , wherein the emulsion comprises a continuous body of the second fluid surrounding a plurality of discrete bodies of the first fluid, wherein upon the coalescing the plurality of discrete bodies of the first fluid together form a continuous body of the first fluid, thereby forming the first fluid layer of the first fluid.

21. The method according to claim 1 , wherein the emulsion is below the first area of the support plate during at least part of the coalescing of the first fluid of the emulsion.

22. The method according to claim 1 , the support plate being a first support plate, the method comprising:

providing a second support plate;

sealing the second support plate to the first support plate to form a space between the first support plate and the second support plate, the space comprising the first fluid and the second fluid; and

rotating an orientation of the first support plate and the second support plate after the sealing the second support plate to the first support plate.

23. The method according to claim 1 , wherein the first fluid is hydrophobic and the second fluid is hydrophilic, and in the emulsion the first fluid is dispersed in the second fluid, the first fluid having one or more of:

a droplet size of between 0.05 micrometers and 10 micrometers, or

a Coefficient of Variation (CV) value of 10% or less.

24. The method according to claim 1 , wherein the emulsion comprises a non-ionic surfactant comprising a first compound having a non-polar segment and a second compound having a polar segment, a difference between a first solubility parameter (SP) value of the first compound and a second solubility parameter (SP) value of the second compound being 4 or greater.

25. The method according to claim 1 , comprising preparing the emulsion less than: 5 minutes, 15 minutes, or 30 minutes before the providing the emulsion.

26. The method according to claim 1 , wherein the medium is substantially a vacuum.