Display panel and display device

1 . A display panel, comprising:

a substrate;

light-emitting devices;

a plurality of pad groups on a side of the substrate, wherein each of the plurality of pad groups includes a first pad and a second pad, and at least one pad group of the plurality of pad groups corresponds to one light-emitting device;

a driving circuit layer disposed between the substrate and the plurality of pad groups;

one or more first metal elements and one or more second metal elements disposed in the driving circuit layer at a side of the plurality of pad groups close to the substrate;

a plurality of light-emitting regions;

a plurality of light-transmitting regions; and

at least one insulating layer,

wherein:

in one pad group of the plurality of pad groups corresponding to one same light-emitting device, along a direction perpendicular to a plane of the substrate, the first pad at least partially overlaps the one or more first metal elements, the second pad at least partially overlaps the one or more second metal elements, an overlapping area of the first pad and the one or more first metal elements is S1, and an overlapping area of the second pad and the one or more second metal elements is S2, wherein |S1−S2|/S1≤5%;

or

in one pad group of the plurality of pad groups corresponding to one same light-emitting device, along the direction perpendicular to the plane of the substrate, the first pad does not overlap the one or more first metal elements, and the second pad does not overlap the one or more second metal elements;

each light-emitting region of the plurality of light-emitting regions includes at least one light-emitting device;

an orthographical projection of one pad group of the plurality of pad groups on the substrate is located in a corresponding one of the plurality of light-emitting regions;

the at least one insulating layer is disposed on the side of the plurality of pad groups close to the substrate, and includes through holes in the plurality of light-transmitting regions;

in one pad group of the plurality of pad groups, along a direction parallel to the plane of the substrate, a minimum distance from the first pad to one corresponding through hole is W1, and a minimum distance from the second pad to one corresponding through hole is W2, wherein |W1−W2|≤1.1 μm;

each light-emitting device includes at least a first-color light-emitting device and a second-color light-emitting device;

the first-color light-emitting device is a blue or green light-emitting device, and the second-color light-emitting device is a red light-emitting device;

in one of the plurality of pad groups corresponding to the first color light-emitting device, a number of the one or more first metal elements at least partially overlapping the first pad is P;

in one of the plurality of pad groups corresponding to the second color light-emitting device, a number of the one or more first metal elements at least partially overlapping the first pad is Q; and

Q>P≥0, and P and Q are integers.

2 . The display panel according to claim 1 , wherein the one or more first metal elements and the one or more second metal elements are disposed in a same layer.

3 . The display panel according to claim 2 , wherein:

the display panel includes a first metal layer on the side of the plurality of pad groups close the substrate;

the one or more first metal elements and the one or more second metal elements are disposed in the first metal layer; and

there are no other metal layers between the first metal layer and the plurality of pad groups.

4 . The display panel according to claim 1 , further including a thin film transistor array layer on the side of the plurality of pad groups close to the substrate, wherein:

the thin film transistor array layer includes a plurality of thin film transistors;

the thin film transistor array layer includes a second metal layer;

sources and/or drains of the plurality of thin film transistors are located in the second metal layer; and

the second metal layer is located on a side of the one or more first metal elements and/or the one or more second metal elements facing the substrate, or the one or more first metal elements and/or the one or more second metal elements are located in the second metal layer.

5 . The display panel according to claim 4 , wherein:

in one pad group corresponding to one same light-emitting device, along the direction perpendicular to the plane of the substrate, a number of the one or more first metal elements at least partially overlapping the first pad is M, and a number of the one or more second metal elements at least partially overlapping the second pad is N, wherein M=N, and M and N are integers larger than or equal to 0.

6 . The display panel according to claim 1 , wherein:

in one pad group of the plurality of pad groups, along the direction perpendicular to the plane of the substrate, a minimum distance from the first pad to the substrate is equal to a minimum distance from the second pad to the substrate.

7 . The display panel according to claim 1 , wherein W1≥7.5 μm, W2≥7.5 μm.

8 . The display panel according to claim 1 , wherein:

in one pad group of the plurality of pad groups, along the direction parallel to the plane of the substrate, a minimum distance from the one or more first metal elements to one corresponding through hole is W3, and a minimum distance from the one or more second metal elements to one corresponding through hole is W4, wherein |W3−W4|≤1.1 μm.

9 . The display panel according to claim 1 , wherein:

the at least one insulating layer is an organic layer on the side of the one or more first metal elements and/or the one or more second metal elements close to the plurality of pad groups;

the organic layer is in direct contact with the one or more first metal elements and/or the one or more second metal elements.

10 . The display panel according to claim 1 , wherein:

the plurality of the light-transmitting regions is arranged along a first direction;

one pad group of the plurality of pad groups is disposed between two adjacent light-transmitting regions of the plurality of the light-transmitting regions along the first direction; and

in one pad group of the plurality of pad groups, the first pad and the second pad are arranged along the first direction.

11 . The display panel according to claim 1 , further including thin film transistors, wherein:

each light-emitting region of the plurality of light-emitting regions includes at least two light-emitting devices;

sources/drains of the thin film transistors are electrically connected to the first pads in the plurality of pad groups; and

in one pad group of the plurality of pad groups, the first pad is located at a side of the second pad close to a corresponding one of the plurality of light-transmitting regions.

12 . The display panel according to claim 11 , wherein:

the plurality of the light-transmitting regions is arranged along a first direction; and

at least two pad group of the plurality of pad groups are disposed between two adjacent light-transmitting regions of the plurality of the light-transmitting regions along the first direction.

13 . The display panel according to claim 1 , wherein:

a third metal element is disposed between two adjacent light-transmitting regions of the plurality of the light-transmitting regions;

in the direction perpendicular to the plane of the substrate, the third metal element does not overlap the first pad, and the third metal element does not overlap the second pad;

in one pad group of the plurality of pad groups, an orthographic projection of the third metal element on the substrate is located between the orthographic projection of the first pad on the substrate and the orthographic projection of the second pad on the substrate; and

along the direction from the first pad to the second pad, a distance from the third metal element to the first pad is equal to a distance from the third metal element to the second pad.

14 . The display panel according to claim 1 , wherein:

one first metal element and one second metal element are disposed between two adjacent light-transmitting regions of the plurality of the light-transmitting regions;

in one pad group of the plurality of pad groups, an orthographical projection of one first metal on the substrate part at least partially overlaps an orthographical projection of the first pad on the substrate, and an orthographical projection of one second metal element on the substrate at least partially overlaps an orthographical projection of the second pad on the substrate; and

in one pad group of the plurality of pad groups, the first pad and the second pad have a symmetrical structure with respect to a first symmetric axis, and the one or more first metal elements and the one or more second metal elements have a symmetrical structure with respect to the first symmetric axis.

15 . The display panel according to claim 1 , wherein:

one pad group of the plurality of pad groups includes an electrode layer and a eutectic layer on a side of the electrode layer away from the substrate; and

an overlapping region of the eutectic layer and the electrode layer is the first pad or the second pad.

16 . A display device, comprising a display panel, wherein:

the display panel includes:

a substrate;

light-emitting devices;

a plurality of pad groups on a side of the substrate, wherein each of the plurality of pad groups includes a first pad and a second pad, and at least one pad group of the plurality of pad groups corresponds to one light-emitting device;

a driving circuit layer disposed between the substrate and the plurality of pad groups;

one or more first metal elements and one or more second metal elements disposed in the driving circuit layer at a side of the plurality of pad groups close to the substrate;

a plurality of light-emitting regions;

a plurality of light-transmitting regions; and

at least one insulating layer,

wherein:

in one pad group of the plurality of pad groups corresponding to one same light-emitting device, along a direction perpendicular to a plane of the substrate, the first pad at least partially overlaps the one or more first metal elements, the second pad at least partially overlaps the one or more second metal elements, an overlapping area of the first pad and the one or more first metal elements is S1, and an overlapping area of the second pad and the one or more second metal elements is S2, wherein |S1−S2|/S1≤5%; or

in one pad group of the plurality of pad groups corresponding to one same light-emitting device, along the direction perpendicular to the plane of the substrate, the first pad does not overlap the one or more first metal elements, and the second pad does not overlap the one or more second metal elements;

each light-emitting region of the plurality of light-emitting regions includes at least one light-emitting device;

an orthographical projection of one pad group of the plurality of pad groups on the substrate is located in a corresponding one of the plurality of light-emitting regions;

the at least one insulating layer is disposed on the side of the plurality of pad groups close to the substrate, and includes through holes in the plurality of light-transmitting regions;

in one pad group of the plurality of pad groups, along a direction parallel to the plane of the substrate, a minimum distance from the first pad to one corresponding through hole is W1, and a minimum distance from the second pad to one corresponding through hole is W2, wherein |W1−W2|≤1.1 μm;

each light-emitting device includes at least a first-color light-emitting device and a second-color light-emitting device;

the first-color light-emitting device is a blue or green light-emitting device, and the second-color light-emitting device is a red light-emitting device;

in one of the plurality of pad groups corresponding to the first color light-emitting device, a number of the one or more first metal elements at least partially overlapping the first pad is P;

in one of the plurality of pad groups corresponding to the second color light-emitting device, a number of the one or more first metal elements at least partially overlapping the first pad is Q; and

Q>P≥0, and P and Q are integers.

17 . A display panel, comprising:

a substrate;

light-emitting devices;

a plurality of pad groups on a side of the substrate, wherein each of the plurality of pad groups includes a first pad and a second pad, and at least one pad group of the plurality of pad groups corresponds to one light-emitting device;

a driving circuit layer disposed between the substrate and the plurality of pad groups; and

one or more first metal elements and one or more second metal elements disposed in the driving circuit layer at a side of the plurality of pad groups close to the substrate,

wherein:

in one pad group of the plurality of pad groups corresponding to one same light-emitting device, the light-emitting device includes a first pin and a second pin, the first pin being bonded and electrically connected to the first pad, and the second pin being bonded and electrically connected to the second pad;

in one pad group of the plurality of pad groups corresponding to one same light-emitting device, along a direction perpendicular to a plane of the substrate, the first pad at least partially overlaps the one or more first metal elements, the second pad at least partially overlaps the one or more second metal elements, an overlapping area of the first pad and the one or more first metal elements is S1, and an overlapping area of the second pad and the one or more second metal elements is S2, wherein |S1−S2|/S1≤5%;

or

in one pad group of the plurality of pad groups corresponding to one same light-emitting device, along the direction perpendicular to the plane of the substrate, the first pad does not overlap the one or more first metal elements, and the second pad does not overlap the one or more second metal elements;

each light-emitting device includes at least a first-color light-emitting device and a second-color light-emitting device;

the first-color light-emitting device is a blue or green light-emitting device, and the second-color light-emitting device is a red light-emitting device;

in one of the plurality of pad groups corresponding to the first color light-emitting device, a number of the one or more first metal elements at least partially overlapping the first pad is P;

in one of the plurality of pad groups corresponding to the second color light-emitting device, a number of the one or more first metal elements at least partially overlapping the first pad is Q; and

Q>P≥0, and P and Q are integers.

18 . A display device comprising the display panel of claim 17 .