Display panel and display panel test system
A display panel measures a contact resistance of an adhesive portion to evaluate adhesion quality of an integrated circuit mounted thereon. The display panel includes a plurality of light-emitting elements, a first pad part including a plurality of first effective pads electrically connected to the light-emitting elements, and n (n being a natural number equal to or greater than 2) first measuring pads insulated from the light-emitting elements, a conductive adhesive film on the first pad part and including a plurality of conductive balls, an integrated circuit on the conductive adhesive film, and including an internal line electrically connected to the first measuring pads by the conductive balls, and a second pad part including a plurality of second effective pads electrically connected to the first effective pads, and 2n second measuring pads electrically connected to the first measuring pads.
1. A display panel comprising:
a plurality of light-emitting elements;
a first pad part comprising:
a plurality of first effective pads electrically connected to the light-emitting elements; and
n (n being a natural number equal to or greater than 2) first measuring pads insulated from the light-emitting elements;
a conductive adhesive film on the first pad part and comprising a plurality of conductive balls;
an integrated circuit on the conductive adhesive film, and comprising an internal line electrically connected to the first measuring pads by the conductive balls; and
a second pad part comprising:
a plurality of second effective pads electrically connected to the first effective pads; and
2n second measuring pads electrically connected to the first measuring pads,
wherein each of the first measuring pads is electrically connected to two respective ones of the second measuring pads.
2. The display panel of claim 1 , wherein the integrated circuit is configured to apply an electrical signal to the light-emitting elements.
3. The display panel of claim 2 , wherein the integrated circuit is mounted by a chip-on-glass (COG) method or a chip-on-plastic (COP) method.
4. The display panel of claim 3 , further comprising a printed circuit board electrically connected to the second pad part.
5. The display panel of claim 4 , wherein the printed circuit board is mounted by the chip-on-glass (COG) method or the chip-on-plastic (COP) method.
6. The display panel of claim 1 , wherein n is equal to 2,
wherein the first pad part further comprises a third measuring pad electrically connected to the internal line, and
wherein the second pad part further comprises a fourth measuring pad electrically connected to the third measuring pad.
7. The display panel of claim 1 , wherein n is equal to 3.
8. The display panel of claim 1 , wherein n is equal to 4.
9. The display panel of claim 1 , wherein the first effective pads and the first measuring pads are arranged in three rows.
10. The display panel of claim 1 , wherein the first effective pads and the first measuring pads are arranged in four rows.
11. The display panel of claim 1 , wherein a bending axis is defined between the first pad part and the light-emitting elements, and
wherein the display panel is bent with respect to the bending axis.
12. The display panel of claim 1 , wherein the internal line is insulated from other lines in the integrated circuit.
13. The display panel of claim 1 , wherein each of the light-emitting elements comprises an organic light-emitting layer.
14. A display panel test system comprising:
a display panel comprising:
a plurality of light-emitting elements;
a test pad part comprising test pads insulated from the light-emitting elements, the test pads comprising:
a first test pad;
a second test pad; and
a third test pad;
a conductive adhesive film on the test pads, and comprising a plurality of conductive balls;
an integrated circuit on the conductive adhesive film, and comprising an internal line electrically connected to the test pads by the conductive balls; and
an input pad part comprising input pads electrically connected to the test pads, the input pads comprising:
a first input pad electrically connected to the first test pad;
a second input pad electrically connected to the first test pad;
a third input pad electrically connected to the second test pad;
a fourth input pad electrically connected to the second test pad;
a fifth input pad electrically connected to the third test pad; and
a sixth input pad electrically connected to the third test pad; and
a test device electrically connected to the input pads to measure a contact resistance of the test pads, the conductive adhesive film, and the internal line.
15. The display panel test system of claim 14 , wherein the test device is configured to apply a current between two of the input pads, and is configured to measure a voltage between two others of input pads.
16. The display panel test system of claim 14 , wherein the test device is configured to:
apply a current between the first input pad and the third input pad, and measure a voltage between the second input pad and the fifth input pad to measure the contact resistance of the first test pad, the conductive adhesive film, and the internal line
apply a current between the third input pad and the first input pad, and measure the voltage between the fourth input pad and the fifth input pad to measure the contact resistance of the second test pad, the conductive adhesive film, and the internal line; and
apply a current between the fifth input pad and the first input pad, and measure the voltage between the sixth input pad and the third input pad to measure the contact resistance of the third test pad, the conductive adhesive film, and the internal line.