Anisotropic conductive film and electronic device including the same
An electronic device includes an anisotropic conductive film as a connection material, the anisotropic conductive film being formed from an anisotropic conductive film-forming composition. The anisotropic conductive film-forming composition includes a polycyclic aromatic ring-containing epoxy resin, a fluorene epoxy resin, nano silica and conductive particles.
1. An electronic device, comprising:
an anisotropic conductive film as a connection material, the anisotropic conductive film being formed from an anisotropic conductive film-forming composition, the anisotropic conductive film-forming composition including:
a polycyclic aromatic ring-containing epoxy resin;
a fluorene epoxy resin;
nano silica; and
conductive particles;
wherein the fluorine epoxy resin has a boiling point of about 50 to about 80° C.
2. The electronic device as claimed in claim 1 , wherein the polycyclic aromatic ring-containing epoxy resin has a glass transition temperature after curing (Tg) of about 165° C. to about 250° C.
3. The electronic device as claimed in claim 1 , wherein the fluorine epoxy resin has a molecular weight of about 1,000 or less.
4. The electronic device as claimed in claim 1 , wherein the polycyclic aromatic ring-containing epoxy resin includes at least one selected from the group of tetra-functional aromatic ring-containing epoxy resins and bi-functional aromatic ring-containing epoxy resins.
5. The electronic device as claimed in claim 1 , wherein a weight ratio of the polycyclic aromatic ring-containing epoxy resin to the nano silica ranges from about 3:1 to about 6:1.
6. The electronic device as claimed in claim 1 , wherein the fluorene epoxy resin is a resin containing a glycidyl group in a bisphenol fluorene, the bisphenol fluorene being represented by Formula I:
wherein each R is independently an alkyl group, an alkoxy group, an aryl group or a cycloalkyl group, each m is independently an integer from 0 to 4, and each n is independently an integer from 1 to 5.
7. The electronic device as claimed in claim 1 , wherein a weight ratio of the polycyclic aromatic ring-containing epoxy resin to the fluorene epoxy resin ranges from about 1:0.1 to about 1:1.5.
8. The electronic device as claimed in claim 1 , wherein the anisotropic conductive film is formed from the anisotropic conductive film-forming composition in a chip on glass (COG) mounting process.
9. An electronic device, comprising an anisotropic conductive film as a connection material, the anisotropic conductive film being formed from an anisotropic conductive film-forming composition, the anisotropic conductive film-forming composition including:
a polycyclic aromatic ring-containing epoxy resin; and
a fluorene epoxy resin having a boiling point of about 50 to about 80° C.,
wherein a weight ratio of the polycyclic aromatic ring-containing epoxy resin to the fluorene epoxy resin ranges from about 1:0.1 to about 1:1.5.
10. The electronic device as claimed in claim 9 , wherein the fluorene epoxy resin has a liquid phase at 25° C.
11. The electronic device as claimed in claim 9 , wherein the polycyclic aromatic ring-containing epoxy resin includes at least one selected from the group of tetra-functional aromatic ring-containing epoxy resins and bi-functional aromatic ring-containing epoxy resins.
12. The electronic device as claimed in claim 9 , wherein a weight ratio of the polycyclic aromatic ring-containing epoxy resin to the fluorene epoxy resin ranges from about 1:0.14 to about 1:1.
13. The electronic device as claimed in claim 9 , wherein:
the anisotropic conductive film-forming composition further includes nano silica, and
a weight ratio of the polycyclic aromatic ring-containing epoxy resin to the nano silica ranges from about 3:1 to about 6:1.
14. The electronic device as claimed in claim 9 , wherein the anisotropic conductive film provides uniform indentation after the film is bonded.
15. The electronic device as claimed in claim 14 , wherein the anisotropic conductive film has a preliminary pressing temperature of 60° C. or more.
16. The electronic device as claimed in claim 1 , wherein the anisotropic conductive film has a peel strength of about 4 MPa or more as measured after pressing at 70° C. and 1 MPa for 0.5 seconds.
17. The electronic device as claimed in claim 16 , wherein the anisotropic conductive film has a preliminary pressing temperature of 60° C. or more.
18. The electronic device as claimed in claim 16 , wherein the anisotropic conductive film provides uniform indentation after the film is bonded.