Chip-on-film and display including the same
Disclosed herein is a chip-on-film including: a base film; a driver mounted on one of upper and lower surfaces of the base film; and at least one pad group, which includes signal wiring lines disposed on the upper and lower surfaces of the base film and transmitting signals via two paths, a first pad and a second pad disposed on one of the upper and lower surfaces of the base film, and a plurality of through-holes disposed between the first pad and the second pad and electrically connecting the signal wiring lines to each other, wherein the first pad and the second pad are separated a predetermined distance from each other in a width direction of the base film, and each of the first pad and the second pad is obliquely arranged in plural in a longitudinal direction of the base film.
1. A chip-on-film comprising:
a base film comprising a first surface and a second surface at an opposite side of the base film, the base film formed with first through-holes and second through-holes;
a driver chip mounted on the first surface, the second through-holes closer to the driver chip than the first through-holes in a longitudinal direction of the chip-on-film;
pad groups on the second surface, the pad groups comprising a first set of pads and a second set of pads;
a first set of signal wiring lines on the first surface or the second surface to electrically connect the first set of pads to the driver chip via the first through-holes; and
a second set of signal wiring lines on the first surface or the second surface to electrically connect the second set of pads to the driver chip via the second through-holes,
wherein at least one of the first set of pads and the second set of pads is arranged along a width direction of the base film with the first set of pads and the second set of pads extending in the longitudinal direction.
2. The chip-on-film according to claim 1 , wherein the first set of pads is separated from the second set of pads by a predetermined distance in the longitudinal direction, and wherein the first set of pads and the second set of pads are placed along the width direction in a staggered manner.
3. The chip-on-film according to claim 1 , wherein portions of the first set of the signal wiring lines connected to the first set of pads extend parallel to a direction in which the first set of pads extend, and portions of the second set of the signal wiring lines connected to the second set of pads extend in the direction.
4. The chip-on-film according to claim 1 , wherein connection wiring lines are disposed inside of the through holes, and through-hole pads are formed around the through-holes.
5. The chip-on-film according to claim 4 , wherein the through-hole pads are separated from each other by a distance in a longitudinal direction of the base film and offset from each other in a width direction of the base film.
6. The chip-on-film according to claim 4 , wherein the through-hole pads are offset from each other in the longitudinal direction of the base film and separated from each other by a distance in a width direction of the base film.
7. The chip-on-film according to claim 1 , further comprising:
a protective layer disposed on the second surface of the base film except a region between the first set of pads and the second set of pads.
8. The chip-on-film according to claim 1 , wherein each of the first set of pads and the second sets of pad has a trapezoidal or triangular shape.
9. The chip-on-film according to claim 1 , wherein the driver chip is a semiconductor integrated circuit (IC) chip.
10. The chip-on-film according to claim 1 , wherein the pad groups are configured to electrically connect to a display panel or a printed circuit board.