Apparatus and method of fabricating thin film pattern
A fabricating method and apparatus of a thin film pattern improves the reliability of forming the thin film pattern by a resist printing method. The apparatus includes a print roller device of a roll shape around which a blanket is wound; a spray device located around the print roller device for spraying an etch resist solution to the blanket; and a print plate of an engraved shape where a groove of a desired thin film shape and a projected part except the groove are formed, and the etch resist solution has a surfactant inclusive of an ethylene oxide fluorinated polymer material.
1. A fabricating method of a thin film pattern, comprising:
providing a print roller device having a roll shape around which a blanket is wound;
coating the blanket with an etch resist solution including a surfactant inclusive of an ethylene oxide fluorinated polymer;
providing a print plate of an engraved shape where a groove and a projected part except the groove is formed; and
transferring the etch resist solution only on the projected part of the print plate and leaving the etch resist solution of an area corresponding to the groove in the print roller device,
wherein the etch resist solution consists of a base polymer of 4-20%, a carrier solvent of 40-60%, a printing solvent of 20-40% and a surfactant of 0.05-1%,
wherein the base polymer includes a polymer chain,
wherein the surfactant includes molecules of a fluorine radical corresponding to a hydrophobic radical and a hydrocarbon chain and is CF 3 (CF 2 ) 4 (CH 2 CH 2 O) 10 or CF 3 (CF 2 ) 5 (CH 2 CH 2 O) 14 ,
wherein the surfactant has a similar surface energy as the polymer chain of the base polymer, and the molecules of the surfactant are located randomly with respect to the polymer chain of the base polymer,
wherein each of the blanket, the print plate and the etch resist solution has a non-polar surface energy value, a polar surface energy value, and a surface energy value that is a sum of the non-polar surface energy value and a polar surface energy value,
wherein the non-polar surface energy value of the etch resist solution is greater than the non-polar surface energy value of the blanket and is less than the non-polar surface energy value of the print plate, and
wherein the polar surface energy value of the etch resist solution is greater than the polar surface energy value of the blanket and is less than the polar surface energy value of the print plate.
2. The fabricating method according to claim 1 , wherein an adhesive force between the etch resist solution and the print plate is stronger than an adhesive force between the etch resist solution and the blanket.
3. The fabricating method according to claim 1 , wherein the base polymer is any one of novolac, poly methyl methacrylate or poly methyl acrylate.
4. The fabricating method according to claim 1 , wherein the carrier solvent is at least one alcohol.
5. The fabricating method according to claim 1 , wherein the printing solvent is at least any one of N-Methyl pyrrolidone, ethyl benzoate or tri-isopropyl benzene.
6. The fabricating method according to claim 1 , wherein transferring the etch resist solution onto the projected part of the print plate further includes:
contacting the etch resist solution with the surface of the projected part while rotating the print roller device which is coated with the etch resist solution.
7. The fabricating method according to claim 1 , further comprising:
providing a substrate where a thin film layer is formed; and
transferring the etch resist solution left in the print roller device onto the thin film layer to form the etch resist of the same shape as a groove of the print plate onto the thin film layer.