Flexible printed circuit board, COF module, and electronic device comprising the same

A flexible printed circuit board comprising:

• a substrate;
• a plurality of circuit pattern disposed on the substrate;
• and
• a plurality of dummy patterns disposed on the substrate,
• wherein the circuit pattern includes a plurality of first circuit patterns, a plurality of second circuit patterns, and a plurality of third circuit patterns,
• wherein the first circuit patterns are connected with a chip and a circuit board,
• wherein the second circuit patterns are connected with the chip and a display panel,
• wherein the third circuit patterns are connected with the circuit board and the display panel,
• wherein the third circuit pattern includes a third-first pad portion, a third-second pad portion, and a third wiring portion connecting the third-first pad portion and the third-second pad portion,
• wherein the dummy patterns are disposed between two adjacent third wiring portions,
• a line width of the third wiring portion is greater than a line width of the fourth wiring portion, and
• wherein the third wiring portion includes a first wiring region and a second wiring region that are integrally formed,
• a line width of the second wiring region is greater than a line width of the first wiring region, and
• the second wiring region is connected to a plurality of first wiring regions,
• wherein a minimum distance between the second wiring region and the fourth wiring portion is greater than a distance between adjacent second wiring regions.