Display panel having inclined edge defined by respective end surfaces of base substrate and insulating layer, and display device including the same

1. A display panel, comprising:

a base substrate including:

a display region including a pixel, and

a pad region which is adjacent to the display region and defines an end surface of the base substrate which is furthest from the display region and exposed outside the display panel;

an insulating layer which is in the display region and the pad region; and

in the pad region:

a signal pad electrically connected to the pixel;

a dummy pad electrically connected to the signal pad;

the insulating layer which covers the signal pad and the dummy pad and defines an end surface of the insulating layer which is furthest from the display region and exposed outside the display panel; and

a first opening in the insulating layer which exposes the signal pad to outside the insulating layer and to outside the display panel,

wherein, in the pad region, the end surface of the base substrate and the end surface of the insulating layer together define an inclined edge of the display panel.

2. The display panel of claim 1 , wherein

in a thickness direction of the base substrate, the insulating layer comprises:

a lower insulating layer between the base substrate and the dummy pad,

an intermediate insulating layer between the lower insulating layer and the signal pad, and

an upper insulating layer facing the intermediate insulating layer with the signal pad therebetween, and

the lower insulating layer, the intermediate insulating layer, and the upper insulating layer respectively define end surfaces which together define the end surface of the insulating layer.

3. The display panel of claim 2 , wherein the inclined edge of the display panel extends along a first direction,

further comprising:

the signal pad provided in plural, and the plurality of the signal pads comprising a first signal pad and a second signal pad which are arranged spaced apart from each other in the first direction, and

the dummy pad provided in plural, and the plurality of the dummy pads comprising:

a first dummy pad corresponding to the first signal pad, and

a second dummy pad corresponding to the second signal pad and spaced apart from the first dummy pad in the first direction.

4. The display panel of claim 3 , wherein along the thickness direction of the base substrate, the intermediate insulating layer comprises a first insulating layer and a second insulating layer in order from the lower insulating layer to each of the first signal pad and the second signal pad.

5. The display panel of claim 3 , wherein

along the thickness direction of the base substrate, the first dummy pad and the second dummy pad are each between the lower insulating layer and the upper insulating layer, and

the first dummy pad and the second dummy pad are electrically connected to the first signal pad and the second signal pad, respectively.

6. The display panel of claim 4 , further comprising:

a first connection pad which connects the first signal pad to the first dummy pad, and

a second connection pad which connects the second signal pad to the second dummy pad,

wherein along the thickness direction of the base substrate, the first connection pad and the second connection pad are each between the first insulating layer and the second insulating layer of the intermediate insulating layer.

7. The display panel of claim 3 , further comprising:

a second opening defined in the upper insulating layer at a position between the first dummy pad and the second dummy pad, wherein the second opening exposes the intermediate insulating layer to outside the upper insulating layer, and

a dummy insulating pattern in the second opening.

8. The display panel of claim 7 , wherein the dummy insulating pattern which is in the second opening at the position between the first dummy pad and the second dummy pad protrudes outside of the upper insulating layer.

9. The display panel of claim 3 , wherein

the first opening is defined in the upper insulating layer, and

the upper insulating layer extends between the first signal pad and the second signal pad, in the first direction.

10. The display panel of claim 7 , wherein

a diagonal direction crosses the first direction,

each of the first dummy pad, the second dummy pad and the dummy insulating pattern has a length along the diagonal direction, and

the length of the first dummy pad and the length of the second dummy pad are each greater than the length of the dummy insulating pattern.

11. The display panel of claim 1 , wherein

the dummy pad defines an end surface thereof which is exposed outside the display panel, and

in the pad region, the end surface of the base substrate, the end surface of the insulating layer and the end surface of the dummy pad together define the inclined edge of the display panel.

12. The display panel of claim 8 , wherein along the thickness direction of the base substrate,

the dummy insulating pattern has a thickness which is outside of the upper insulating layer, and

the thickness the dummy insulating pattern ranges from about 0.1 micrometer to about 0.5 micrometer.

13. The display panel of claim 7 , wherein

the pad region comprises:

a first region corresponding to the first signal pad and the second signal pad, and

a second region which is between the first signal pad and the second signal pad and adjacent to the first region in the first direction,

the first opening which exposes the signal pad is defined in the first region, and

the second opening which exposes the intermediate insulating layer to outside the upper insulating layer is defined in the second region.

14. The display panel of claim 7 , wherein

the first opening is provided in plural,

each of the first signal pad and the second signal pad has a width which is exposed by the respective first openings and the width is measured in the first direction,

the dummy insulating pattern has a width measured in the first direction, and

the width of the each signal pad is larger than the width of the dummy insulating pattern.

15. The display panel of claim 1 , wherein in the pad region,

the inclined edge of the display panel extends along a first direction,

the signal pad is extended in a diagonal direction crossing the first direction, and

the insulating layer extends from the signal pad to overlap the dummy pad which is connected the signal pad.

16. A display device, comprising:

a display panel including:

a display region including a pixel, and

a pad region which is adjacent to the display region and defines an inclined edge of the display panel which is furthest from the display region and exposed outside the display panel;

an electronic component connected to the display panel at the pad region thereof; and

a conductive adhesion film which electrically connects the electronic component to the display panel at the pad region thereof,

wherein the display panel comprises:

a base substrate defining an end surface of the base substrate which is furthest from the display region and exposed outside the display panel;

an insulating layer in the display region and the pad region; and

in the pad region:

a signal pad electrically connected to the pixel;

a dummy pad electrically connected to the signal pad;

the insulating layer which covers the signal pad and the dummy pad and defines an end surface of the insulating layer which is furthest from the display region and exposed outside the display panel, and

a first opening in the insulating layer which exposes the signal pad to outside the insulating layer and to outside the display panel,

wherein, in the pad region, the end surface of the base substrate and the end surface of the insulating layer together define the inclined edge of the display panel.

17. The display device of claim 16 , wherein

the inclined edge of the display panel extends along a first direction,

the pad region comprises:

a first region corresponding to the signal pad, and

a second region which is adjacent to the signal pad in the first direction, the electronic component comprises:

a plurality of protruding portions in direct contact with the pad region of the display panel, and

a plurality of gap portions respectively between the plurality of protruding portions,

the plurality of protruding portions correspond to the first region, and

the plurality of gap portions correspond to the second region.

18. The display device of claim 16 , wherein

the electronic component comprises:

a plurality of protruding portions in direct contact with the pad region of the display panel, and

a plurality of gap portions respectively between the plurality of protruding portions, and

the plurality of protruding portions are in contact with the signal pad.

19. The display device of claim 16 , wherein the inclined edge of the display panel extends along a first direction,

further comprising:

the signal pad provided in plural, and the plurality of the signal pads comprising a first signal pad and a second signal pad arranged in the first direction, and

the dummy pad provided in plural, and the plurality of the dummy pads comprising:

a first dummy pad corresponding to the first signal pad, and

a second dummy pad corresponding to the second signal pad and spaced apart from the first dummy pad in the first direction.

20. The display device of claim 19 , further comprising:

a second opening in the insulating layer at a position between the first dummy pad and the second dummy pad, and

a dummy insulating pattern in the second opening.