Manufacturing method for donor film with improved surface roughness
A manufacturing method using an additional heat-treatment process for a donor film with improved surface roughness. The improved donor film, used in a laser induced thermal imaging method, is capable of enhancing the lifetime of products and reducing the defect rates thereof. A manufacturing method for a donor film according to the invention, includes: providing a donor film comprising a base film, a light-to-heat conversion layer and an organic film; heating the donor film to provide a heat-treated donor film; and cooling the heat-treated donor film. The surface roughness of a donor film can be improved, and the non-uniform distribution of a laser on a region subjected to the LITI process can be minimized to prevent the over- or under-transfer of an transferred organic film, etc., and the non-uniform adhesion of the transferred organic film with an acceptor substrate.
1. A manufacturing method for a donor film with improved surface roughness comprising:
providing a donor film comprising a base film, a light-to-heat conversion layer and an organic film;
heating the donor film to provide a heat-treated donor film; and
cooling the heat-treated donor film.
2. The method according to claim 1 , wherein the heating is performed at a temperature in the range of a glass transition temperature to a melting temperature of the base film.
3. The method according to claim 1 , wherein the heating is performed at a temperature in the range of a glass transition temperature of the base film to a deformation temperature or a reaction temperature of any one of the base film, the light-to-heat conversion layer, and the organic film.
4. The method according to claim 1 , further comprising applying tension to the donor film prior to the heating of the donor film.
5. The method according to claim 1 , wherein at least one of the heating and cooling steps is performed under vacuum.
6. The method according to claim 1 , wherein at least one of the heating and cooling steps is performed under an inert gas atmosphere.
7. The method according to claim 6 , wherein the inert gas is Ar.
8. The method according to claim 1 , wherein at least one of the heating and cooling steps is performed under a nitrogen atmosphere.
9. The method according to claim 1 , wherein at least one of the heating and cooling steps is performed under atmospheric pressure.
10. The method according to claim 1 , wherein the base film is made of polyethylene terephthalate (PET) material.
11. The method according to claim 10 , wherein the heating of the donor film is performed at 90° C. or more.
12. The method according to claim 10 , wherein the heating of the donor film is performed at 100° C.
13. A manufacturing method for a donor film with improved surface roughness comprising:
providing a donor film comprising a polyethylene terephthalate (PET) base film, a light-to-heat conversion layer and an organic film;
tensioning the donor film;
heating the donor film at 100° C. under a vacuum to provide a heat-treated donor film; and
cooling the heat-treated donor film.