Chip-on-film package and display device having the same
A chip-on-film package includes a base film, a test line, and an integrated circuit chip. The base film includes a bent area in which a bending occurs. The test line is disposed on the base film, and at least a portion of the test line is overlapped with the bent area. The integrated circuit chip is disposed on the base film and includes a first terminal and a second terminal. The first terminal is connected to one end of the test line to output a first signal and the second terminal is connected to the other end of the test line to receive a second signal. The integrated circuit chip detects whether a crack occurs in the bent area based on a difference value in signal characteristics.
1. A display device, comprising:
a display panel displaying an image;
a printed circuit board driving the display panel; and
a chip-on-film package electrically connecting the display panel and the printed circuit board, the chip-on-film package comprising:
a base film including a bent area in which bending of the base film occurs;
a test line disposed on the base film, at least a portion of the test line overlapping the bent area; and
an integrated circuit chip disposed on the base film and including a first terminal connected to one end of the test line to output a first signal and a second terminal connected to the other end of the test line to receive a second signal,
the integrated circuit chip determining whether an undesired crack has occurred in the bent area based on a difference in value of signal characteristics between the first signal and the second signal,
wherein the integrated circuit chip provides a result signal indicating whether the undesired crack has occurred in the bent area of the printed circuit board, and the printed circuit board receives the result signal and controls a driving condition of the display panel in correspondence with the received result signal.
2. The display device of claim 1 , wherein the printed circuit board controls the display panel to be in an OFF state when the received result signal indicates that the undesired crack has occurred in the bent area.
3. The display device of claim 1 , wherein the difference in value of signal characteristics comprises at least one of a time delay difference value, a phase difference value, or a resistance difference value between the first signal and the second signal.
4. The display device of claim 1 , wherein the bent area does not overlap the integrated circuit chip, has a uniform width in a first direction, and is extended in a second direction substantially perpendicular to the first direction, and the test line crosses the bent area in the second direction.
5. The display device of claim 4 , wherein the test line and the integrated circuit chip form a closed-loop.
6. The display device of claim 5 , wherein the portion of the test line that overlaps the bent area comprises at least two straight lines.
7. The display device of claim 6 , wherein the test line has a length in the first direction, which is greater than a sum of a distance in the first direction between the integrated circuit chip and the bent area and a width in the first direction of the bent area.
8. The display device of claim 1 , wherein the test line comprises a detection pattern, wherein the detection pattern has a shape having a greater overlap area with the bent area than an overlap area overlapped a straight line shape with the bent area.
9. The display device of claim 8 , wherein the detecting pattern has a zigzag shape.