Method of forming flexible conduction trace, flexible conduction trace and flexible electronic device using the same

A method of forming a flexible conduction trace, comprising:

• mixing a curable fluid with metal particles having magnetism and conductivity to form a mixture;
• and
• forming a plurality of pillars arranged in the mixture by i) applying a magnetic field to the mixture, ii) arranging the metal particles in a form of the plurality of pillars, and iii) hardening the mixture in a predetermined form, wherein each pillar is formed by the metal particles arranged in a form of a pillar within the mixture,
• wherein adjacent pillars are in direct contact with each other and electrically connected with each other and a contact area of the adjacent pillars increases when the flexible line is extended.

A flexible electronic device comprising:

• a flexible substrate;
• a first electronic circuit unit and a second electronic circuit unit placed on the flexible substrate;
• and
• a flexible conduction trace electrically connecting the first electronic circuit unit and the second electronic circuit,
• wherein the flexible conduction trace comprises a flexible line compressible or extendible, a plurality of metal pillars formed within the flexible line, and an external wiring formed on at least one surface of the flexible line,
• wherein each metal pillar is formed by a plurality of conductive particles arranged in a form of a pillar within the flexible line, wherein adjacent metal pillars are in direct contact with each other and electrically connected with each other and a contact area of the adjacent metal pillars increases when the flexible line is extended.