Display device connected by anisotropic conductive film

1. A display device, comprising: an electrical connection connected by an anisotropic conductive film, wherein the anisotropic conductive film has a first z-axis length variation rate of 10% to 90%, as measured using a thermo-mechanical analyzer and calculated according to Equation 1:

first z -axis length variation rate=[( L 1 −L 0 )/ L 0 ]×100(%)  (1),

wherein, L 0 is a z-axis length of the anisotropic conductive film at a heating start temperature, and L 1 is a maximum z-axis length of the anisotropic conductive film at 130° C. to 170° C. after being heated, as measured using the thermo-mechanical analyzer,

wherein the anisotropic conductive film is prepared from a composition that includes:

a binder resin;

2-hydroxy-3-phenoxypropyl acrylate;

a curing initiator; and

conductive particles, and

wherein the 2-hydroxy-3-phenoxypropyl acrylate is present in the composition in an amount of 10 wt % to 50 wt %, in terms of solid content of the composition.

2. The display device as claimed in claim 1 , wherein the anisotropic conductive film has a second z-axis length variation rate of −10% to +60%, as measured using a thermo-mechanical analyzer and calculated according to Equation 2:

second z -axis length variation rate=[( L 2 −L 0 )/ L 0 ]×100(%)  (2),

wherein, L 0 is the z-axis length of the anisotropic conductive film at the heating start temperature, and L 2 is a z-axis length of the anisotropic conductive film at 25° C., as measured using the thermo-mechanical analyzer after being heated to 220° C. and cooled to 20° C.

3. The display device as claimed in claim 1 , wherein the anisotropic conductive film has a minimum melt viscosity of 20,000 Pa·sec or less.

4. The display device as claimed in claim 1 , wherein the anisotropic conductive film has an adhesive strength of 500 gf/cm or more, as measured after preliminary compression under conditions of 70° C., 1.0 MPa and 1 second and main compression under conditions of 150° C., 3.0 MPa and 5 second.

5. The display device as claimed in claim 1 , wherein the anisotropic conductive film has a ratio of bubble area in a space between electrodes to total area of the space of 15% or less, as measured after being left at 85° C. and 85% RH for 500 hours subsequent to preliminary compression under conditions of 70° C., 1.0 MPa and 1 second and main compression under conditions of 150° C., 3.0 MPa and 5 second.

6. The display device as claimed in claim 1 , wherein the binder resin has a glass transition temperature of −10° C. to 90° C.

7. The display device as claimed in claim 1 , wherein a weight ratio of the binder resin to the 2-hydroxy-3-phenoxypropyl acrylate is 8:1 to 1:1.

8. The display device as claimed in claim 1 , wherein the binder resin has a weight average molecular weight of 90,000 g/mol or less.

9. The display device as claimed in claim 8 , wherein the binder resin includes at least two binder resins having different molecular weights.

10. The display device as claimed in claim 9 , wherein the binder resin includes:

at least one binder resin having a weight average molecular weight of 20,000 g/mol to 50,000 g/mol, and

at least one binder resin having a weight average molecular weight of greater than 50,000 g/mol to 90,000 g/mol.

11. A display device, comprising: an electrical connection connected by an anisotropic conductive film, wherein the anisotropic conductive film is prepared from a composition that includes:

a binder resin having a glass transition temperature of −10° C. to 90° C. and a weight average molecular weight of 90,000 g/mol or less;

a radical polymerizable material that includes 2-hydroxy-3-phenoxypropyl acrylate, the 2-hydroxy-3-phenoxypropyl acrylate being present in the composition in an amount of 10 wt % to 50 wt %, in terms of solid content of the composition;

a curing initiator; and

conductive particles, and

wherein the anisotropic conductive film has a z-axis length variation rate of −10% to 60%, as measured using a thermo-mechanical analyzer and calculated according to Equation 2:

Z -axis length variation rate=[( L 2 −L 0 )/ L 0 ]×100(%)  (2),

wherein, L 0 is a z-axis length of the anisotropic conductive film at a heating start temperature, and L 2 is a z-axis length of the anisotropic conductive film at 25° C., as measured using the thermo-mechanical analyzer after being heated to 220° C. and cooled to 20° C.

12. The display device as claimed in claim 11 , wherein a weight ratio of the binder resin to the 2-hydroxy-3-phenoxypropyl acrylate is 8:1 to 1:1.

13. The display device as claimed in claim 11 , wherein the composition includes:

20 wt % to 70 wt % of the binder resin;

the 10 wt % to 50 wt % of the 2 hydroxy-3-phenoxypropyl acrylate;

1 wt % to 10 wt % of the curing initiator; and

1 wt % to 20 wt % of the conductive particles, wherein the wt % is in terms of solid content of the composition.

14. An anisotropic conductive film, comprising:

a binder resin having a glass transition temperature of −10° C. to 90° C. and a weight average molecular weight of 90,000 g/mol or less;

a radical polymerizable material that includes 2-hydroxy-3-phenoxypropyl acrylate, the 2-hydroxy-3-phenoxypropyl acrylate being present in the composition in an amount of 10 wt % to 50 wt %, in terms of solid content of the composition;

a curing initiator; and

conductive particles, and

wherein the anisotropic conductive film has a z-axis length variation rate of −10% to 60%, as measured using a thermo-mechanical analyzer and calculated according to Equation 2:

Z -axis length variation rate=[( L 2 −L 0 )/ L 0 ]×100(%)  (2),

wherein, L 0 is a z-axis length of the anisotropic conductive film at a heating start temperature, and L 2 is a z-axis length of the anisotropic conductive film at 25° C., as measured using the thermo-mechanical analyzer after being heated to 220° C. and cooled to 20° C.