Semiconductor device connected by anisotropic conductive film
A semiconductor device connected by an anisotropic conductive film including a first insulation layer, a conductive layer, and a second insulation layer one above another, wherein the conductive layer has an expansion length of 20% or less in a width direction thereof, and the second insulation layer has an expansion length of 50% or more in a width direction thereof, the expansion length is calculated according to Equation 1, below, after glass substrates are placed on upper and lower sides of the anisotropic conductive film respectively, followed by compression at 110° C. to 200° C. for 3 to 7 seconds under a load of 1 MPa to 7 MPa per unit area of a sample, Increased ratio of expansion length (%)=[(length of corresponding layer in width direction after compression−length of corresponding layer in width direction before compression)/length of corresponding layer in width direction before compression]×100. [Equation 1]
1. A device comprising:
a glass substrate that includes a first electrode;
a chip on film (COF), Driver Integrated Circuit (Driver-IC), or Integrated Circuit (IC) chip that includes a second electrode; and
an anisotropic conductive film, wherein the anisotropic conductive film is between the glass substrate that includes the first electrode and the COF, Driver-IC, or IC chip that includes the second electrode, the anisotropic conductive film comprising:
a first insulation layer, a conductive layer, and a second insulation layer sequentially stacked one above another,
wherein:
the conductive layer has an increased ratio of expansion length of 20% or less in a width direction thereof, and
the second insulation layer has an increased ratio of expansion length of 50% or more in a width direction thereof,
the increased ratio of expansion length is calculated according to Equation 1, below, after glass substrates are placed on upper and lower sides of the anisotropic conductive film respectively, followed by compression at 110° C. to 200° C. for 3 to 7 seconds under a load of 1 MPa to 7 MPa per unit area of a sample,
Increased ratio of expansion length (%)=[(length of layer in width direction after compression−length of layer in width direction before compression)/length of layer in width direction before compression]×100, [Equation 1]
a ratio of the expansion length of the second insulation layer to the expansion length of the conductive layer ranges from 4 to 20, and
the anisotropic conductive film has an connection resistance of 4Ω or less, and has a particle capture rate of 30% to 60%, as measured after the anisotropic conductive film is between a glass that includes a first electrode and a COF, Driver-IC, or IC chip that includes a second electrode, followed by primary compression under conditions of 110° C. to 190° C. for 1 to 7 seconds under a load of 50 MPa to 90 MPa, and calculated by Equation 2:
Particle capture rate=(the number of conductive particles per unit area (mm2) of connected portion after primary compression/the number of conductive particles per unit area (mm2) of anisotropic conductive film before pre-compression)×100. [Equation 2]
2. The device as claimed in claim 1 , wherein the anisotropic conductive film has a connection resistance after reliability testing of 10Ω or less, as measured after the anisotropic conductive film is placed a glass comprising a first electrode and COF, Driver-IC or IC chip comprising a second electrode, followed by primary compression under conditions of 110° C. to 190° C. for 1 to 7 seconds under a load of 50 MPa to 90 MPa, and left at 85° C. and 85% RH for 500 hours.
3. The device as claimed in claim 1 , wherein:
the first insulation layer has a thickness of 2 μm or less,
the conductive layer has a thickness of 2 μm to 10 μm, and
the second insulation layer has a thickness of 6 μm to 18 μm.
4. The device as claimed in claim 1 , wherein the conductive layer includes 10 wt % to 40 wt % of inorganic particles, based on a total weight of the conductive layer in terms of solid content.
5. The device as claimed in claim 4 , wherein the inorganic particles have an average particle size of 5 nm to 20 nm.
6. The device as claimed in claim 1 , wherein the conductive layer includes:
20 wt % to 50 wt % of a binder resin;
5 wt % to 20 wt % of an epoxy resin;
0.5 wt % to 10 wt % of a curing agent;
10 wt % to 40 wt % of inorganic particles; and
10 wt % to 40 wt % of conductive particles, all wt % being based on a total weight of the conductive layer in terms of solid content.
7. The device as claimed in claim 3 , wherein the second insulation layer includes a binder resin and an epoxy resin in a weight ratio of 1:1 to 1:8.
8. The device as claimed in claim 7 , wherein the second insulation layer includes:
15 wt % to 50 wt % of a binder resin; and
40 wt % to 75 wt % of an epoxy resin, all wt % being based on a total weight of the second insulation layer in terms of solid content.
9. The device as claimed in claim 3 , wherein the first insulation layer includes:
20 wt % to 60 wt % of a binder resin;
40 wt % to 80 wt % of an epoxy resin; and
0.1 wt % to 10 wt % of a curing agent, all wt % being based on a total weight of the first insulation layer in terms of solid content.