Method of manufacturing conductive particle, anisotropic conductive adhesive having the same, and method of manufacturing display apparatus using the same
View Patent ↗In an anisotropic conductive adhesive containing a conductive particle, the conductive particle includes a resin particle that is provided with a cavity formed therein and a conductive layer surrounding a surface of the resin particle. The cavity is formed by mixing the resin particle with a reactant and partially removing the reactant from the resin particle. Thus, the conductive particle may readily absorb an external pressure, thereby providing an improved malleability to the conductive particle.
1. A method of manufacturing a conductive particle, comprising:
mixing a resin with a first reactant to form a particle;
removing the first reactant from the particle using a second reactant to form a cavity in the particle;
heat-treating the particle; and
forming a conductive layer surrounding the particle.
2. The method of claim 1 , wherein the volume of the cavity is reduced while heat-treating the particle such that the surface of the particle is partially concave.
3. The method of claim 1 , wherein the first reactant comprises calcium carbonate, and the second reactant comprises hydrochloric acid.
4. The method of claim 1 , further comprising, prior to removing the first reactant, reacting the first reactant with a third reactant to make a surface of the first reactant into a hydrophobic state.
5. The method of claim 4 , wherein the first reactant comprises calcium carbonate, and the third reactant comprises at least one of ethanol and stearic acid.
6. The method of claim 1 , wherein the second reactant moves from a surface of the particle to a center of the particle while removing the first reactant, the cavity is randomly formed in a region from a surface of the particle to a predetermined depth, and a malleability of the particle is improved as the predetermined depth increases.
7. The method of claim 6 , wherein the malleability of the particle is more improved by about 10 percents compared with a case where the cavity is not formed in the particle when the predetermined depth is about 0.1 times more than a diameter of the particle.
8. A method of manufacturing a display apparatus, comprising:
preparing a display panel on which a first terminal is formed and a driver on which a second terminal is formed;
forming a conductive particle;
forming an anisotropic conductive adhesive having the conductive particle on at least one of the first terminal and the second terminal; and
positioning the first terminal and the second terminal to face each other while interposing the anisotropic conductive adhesive between the first and second terminals and compressing the first and second terminals to be electrically connected to each other,
wherein the conductive particle is formed by:
mixing a resin with a first reactant to form a particle;
removing the first reactant from the particle using a second reactant to form a cavity in the particle;
heat-treating the particle; and
forming a conductive layer surrounding the particle.
9. The method of claim 8 , wherein a volume of the cavity is reduced while heat-treating the particle such that a surface of the particle is partially concave.
10. The method of claim 8 , wherein the first reactant comprises calcium carbonate, and the second reactant comprises hydrochloric acid.
11. The method of claim 8 , further comprising, prior to removing the first reactant, reacting the first reactant with a third reactant to make a surface of the first reactant in a hydrophobic state.
12. The method of claim 11 , wherein the first reactant comprises calcium carbonate, and the third reactant comprises at least one of ethanol and stearic acid.
13. The method of claim 8 , wherein the second reactant moves from a surface of the particle to a center of the particle while removing the first reactant, the cavity is randomly formed in a region from a surface of the particle to a predetermined depth, and a malleability of the particle is improved as the predetermined depth increases.
14. The method of claim 13 , wherein the malleability of the particle is more improved by about 10 percents compared with a case where the cavity is not formed in the particle when the predetermined depth is about 0.1 times more than a diameter of the particle.