Display panel
The present embodiment relates to a display panel, and more particularly, to a display panel, which can be used without a separate repair process in case that a defect occurs in a micro light-emitting diode (LED) in a transfer process, and can reduce areas occupied by driving circuits and the number of components.
1 . A display panel, comprising:
a substrate;
a driving circuit disposed on the substrate;
a plurality of insulating layers covering the driving circuit;
an inorganic insulating material layer disposed on the plurality of insulating layers;
a bank pattern disposed on the inorganic insulating material layer;
a plurality of light-emitting elements disposed on the bank pattern;
a plurality of electrodes penetrating the plurality of insulating layers and electrically connecting the driving circuit and the plurality of light-emitting elements;
a second electrode disposed on the plurality of light-emitting elements; and
a black matrix disposed on the second electrode,
wherein the bank pattern is made of an organic insulating material and is configured to guide locations to which the plurality of light-emitting elements are attached in a transfer process,
wherein the plurality of light-emitting elements comprise:
a plurality of main light-emitting elements, each having a first electrode connected to a first line; and
a plurality of sub light-emitting elements, each having a first electrode connected to a second line,
wherein the driving circuit is configured to generate current for driving one or more of the plurality of main light-emitting elements and one or more of the plurality of sub light-emitting elements, and
wherein the display panel further comprises a switch circuit including a first switch element configured to selectively connect the driving circuit and the first line to each other and a second switch element configured to selectively connect the driving circuit and the second line to each other.
2 . The display panel of claim 1 , wherein when the plurality of main light-emitting elements are emitting light, the first switch element electrically connects the driving circuit and the first line to each other and transfers the current to the first line in response to a first selection signal that turns on the first switch element, and when any one of the plurality of main light-emitting elements fails to emit light, the second switch element electrically connects the driving circuit and the second line to each other and transfers the current to the second line in response to a second selection signal that turns on the second switch element at a driving time of the any one of the plurality of main light-emitting elements.
3 . The display panel of claim 1 , further comprising:
a first power line configured to supply a driving voltage to the driving circuit;
a second power line to which a cathode voltage that is lower than the driving voltage is for being applied;
a non-driving power line to which a non-driving voltage that is set to be equal to or higher than the driving voltage is for being applied;
a plurality of third switch elements configured to connect a second electrode of each of the main light-emitting elements to the second power line or to a non-driving voltage line; and
a plurality of fourth switch elements configured to connect a second electrode of each of the sub light-emitting elements to the second power line or to the non-driving voltage line.
4 . The display panel of claim 3 , wherein the plurality of third switch elements comprise a third switch element and remaining third switch elements, and
wherein in case that any one of the plurality of main light-emitting elements is driven by the current in a state where the first switch element electrically connects the driving circuit and the first line to each other, the third switch element disposed on the any one of the plurality of main light-emitting elements connects the second electrode of the any one of the plurality of main light-emitting elements to the second power line, and the remaining third switch elements disposed on the remaining main light-emitting elements connect the second electrode of each of the remaining main light-emitting elements to the non-driving voltage line.
5 . The display panel of claim 4 , wherein a voltage obtained by subtracting the driving voltage from the non-driving voltage is a voltage that is lower than a threshold voltage of each of the plurality of main light-emitting elements.
6 . The display panel of claim 3 , wherein the plurality of fourth switch elements comprise a fourth switch element and remaining fourth switch elements, and
wherein in case that any one of the plurality of sub light-emitting elements is driven by the current in a state where the second switch element electrically connects the driving circuit and the second line to each other, the fourth switch element disposed on the any one of the plurality of sub light-emitting elements connects the second electrode of the any one of the plurality of sub light-emitting elements to the second power line, and the remaining fourth switch elements disposed on the remaining sub light-emitting elements connect the second electrode of each of the remaining sub light-emitting elements to the non-driving voltage line.
7 . The display panel of claim 6 , wherein a voltage obtained by subtracting the driving voltage from the non-driving voltage is a voltage that is lower than a threshold voltage of each of the plurality of sub light-emitting elements.
8 . The display panel of claim 1 , wherein the plurality of main light-emitting elements and the plurality of sub light-emitting elements are micro light-emitting diodes (LEDs) that are configured to emit light of a same color wavelength.
9 . The display panel of claim 1 , wherein the second electrode is electrically and commonly connected to the plurality of main light-emitting elements and the plurality of sub light-emitting elements.
10 . The display panel of claim 1 , wherein the black matrix is formed on the second electrode and between the plurality of main light-emitting elements and the plurality of sub light-emitting elements.
11 . The display panel of claim 9 , wherein a width between an upper surface and a lower surface of the black matrix formed in a region where the second electrode is in contact with an upper surface of a contact electrode is different from a width between an upper surface and a lower surface of the black matrix formed between the plurality of main light-emitting elements and the plurality of sub light-emitting elements.
12 . The display panel of claim 1 , wherein the plurality of insulating layers comprise:
a first insulating layer disposed on the driving circuit;
a second insulating layer disposed on the first insulating layer;
a third insulating layer disposed on the second insulating layer;
a fourth insulating layer disposed on the third insulating layer; and
a fifth insulating layer disposed on the fourth insulating layer.
13 . The display panel of claim 12 , wherein each of the first, second, third, fourth and fifth insulating layers includes at least one wiring pattern and at least one contact hole.