Head unit, droplet ejection apparatus, method of manufacturing panel from base, image display apparatus and electronic apparatus

1. A head unit for use in a droplet ejection apparatus, the head unit comprising:

a plurality of droplet ejection heads for ejecting a liquid material onto a predetermined region of a base,

wherein each of the plurality of droplet ejection heads includes at least a nozzle array having a plurality of nozzles aligned through a predetermined pitch along a first direction,

wherein the nozzle array of one of the plurality of droplet ejection heads overlaps the nozzle arrays of at least two other droplet ejection heads when viewed from a second direction perpendicular to the first direction,

wherein all the nozzles of the one and the at least two other droplet ejection heads are arranged at different positions when viewed from the second direction.

2. The head unit as claimed in claim 1 , wherein

the plurality of droplet ejection heads eject the liquid material of a predetermined color, which is one of red, green and blue color.

3. A droplet ejection apparatus for supplying at least three kind of liquid materials onto a base in the form of droplets, each of the at least three kind of liquid materials having a predetermined color, the apparatus comprising:

the head unit defined by claim 1 , wherein the head unit being provided with droplet ejection heads for ejecting the at least three kind of liquid materials;

a stage having two major surfaces, one of the two major surfaces of the stage facing the plurality of droplet ejection heads of the head unit, and the base being supported on the one major surface of the stage;

a moving mechanism for mutually moving the stage with respect to the head unit; and

a control unit for controlling operation of the head unit and the moving mechanism so that each of the plurality of the droplet ejection heads of the head unit ejects droplets of the liquid materials onto the base while mutually moving the stage with respect to the head unit.

4. The droplet ejection apparatus as claimed in claim 3 , wherein the base is a base material for manufacturing a color filter substrate for a liquid-crystal display, and the at least three kind of liquid materials are inks for forming filter layers of the color filter substrate.

5. The droplet ejection apparatus as claimed in claim 3 , wherein the base is a base material for manufacturing an electroluminescence display, and the at least three kind of liquid materials include luminescent materials for manufacturing the electroluminescence display.

6. A method of manufacturing a panel from the base using the droplet ejection apparatus defined by claim 3 , the method comprising the steps of:

preparing the base; and

supplying each of the at least three kind of liquid materials having a predetermined color onto the base in the form of droplets by ejecting the droplets by means of the head unit while mutually moving the base with respect to the head unit.

7. The method as claimed in claim 6 , wherein the base is a base material for manufacturing a color filter substrate for a liquid-crystal display, and the at least three kind of liquid materials are inks for forming filter layers of the color filter substrate.

8. The method as claimed in claim 6 , wherein the base is a base material for manufacturing an electroluminescence display, and the at least three kind of liquid materials include luminescent materials for manufacturing the electroluminescence display.

9. An image display apparatus comprising the panel manufactured using the method defined by claim 6 .

10. An electronic apparatus comprising the image display apparatus defined by claim 9 .

11. The head unit as claimed in claim 1 , wherein the plurality of droplet ejection heads comprise at least a first droplet ejection head, a second droplet ejection head, a third droplet ejection head and a fourth droplet ejection head,

wherein the first droplet ejection head and the second droplet ejection head are arranged along the first direction so that the nozzles of the nozzle array of the first droplet ejection head and the nozzles of the nozzle array of the second droplet ejection head constitute a first consecutive long nozzle array when viewed from the second direction, and the third droplet ejection head and the fourth droplet ejection head are arranged along the first direction so that the nozzles of the nozzle array of the third droplet ejection head and the nozzles of the nozzle array of the fourth droplet ejection head constitute a second consecutive long nozzle array when viewed from the second direction, and

wherein the nozzle array of the first droplet ejection head overlaps the nozzle arrays of the third and fourth droplet ejection heads when viewed from the second direction.

12. The head unit as claimed in claim 11 , wherein the second droplet ejection head is arranged between the third droplet ejection head and the fourth droplet ejection head when viewed from the first direction, and the third droplet ejection head is arranged between the first droplet ejection head and the second droplet ejection head when viewed from the first direction.

13. The head unit as claimed in claim 1 , wherein the nozzle array constitutes first and second nozzle arrays, the first and second nozzle arrays being arranged in a side by side relation in the second direction and the nozzles of the first nozzle array being shifted with a half pitch in the first direction with respect to the nozzles of the second nozzle array when viewed from the second direction.