Display panel having backplate with recesses and display device comprising display panel
Embodiments of the present disclosure relate to a display panel and a display device. The display panel includes a backplate including a plurality of pixel areas and a plurality of recesses configured to separate the plurality of pixel areas from each other, and a plurality of first electrodes on the backplate, wherein orthographic projections of the plurality of first electrodes on the backplate partially overlaps with the plurality of pixel areas, respectively, and wherein at least one of the plurality of first electrodes extends to a bottom surface of the recesses neighboring to the first electrodes.
1 . A display panel comprising:
a backplate comprising a plurality of pixel areas and a plurality of recesses configured to separate the plurality of pixel areas from each other; and
a plurality of first electrodes on the backplate, wherein orthographic projections of the plurality of first electrodes on the backplate partially overlap the plurality of pixel areas, respectively, and wherein at least one of the plurality of first electrodes extends to a bottom surface of the recess neighboring the first electrode such that a portion of the at least one of the plurality of first electrodes is located on the bottom surface of the neighboring recess,
wherein at least one of the plurality of first electrodes comprises:
a first conductive portion on the pixel area of the backplate; and
a second conductive portion covering the first conductive portion and extending to the bottom surface of the recess neighboring to the first conductive portion such that a portion of the second conductive portion is located on the bottom surface of the recess,
wherein the second conductive portion comprises an intermediate portion on the first conductive portion, an extension portion on the bottom surface of the recess, and a connecting portion connecting the intermediate portion and the extension portion,
wherein the connecting portion covers a side of the first conductive portion and a sidewall of the recess, and
wherein the OLED display panel further comprises a pixel definition layer having an opening exposing a portion of the intermediate portion of the second conductive portion, wherein the pixel definition layer comprises a plurality of pixel definition units, each pixel definition unit comprising a first recessed portion in the recess and a first flat portion on either side of the first recessed portion, wherein the first recessed portion comprises a sidewall portion covering the connecting portion and a bottom on the bottom surface of the recess and the extension portion of the second conductive portion, and wherein the first flat portion covers another portion of the intermediate portion that is not exposed by the opening.
2 . The display panel according to claim 1 , wherein extending surfaces of two sidewalls of the recess intersect and wherein i) an intersection line of the extending surfaces of the two sidewalls is located on a side of the bottom surface of the recess opposite an opening of the recess or ii) on a side of the bottom surface of the recess facing the opening of the recess.
3 . The display panel according to claim 1 , wherein a slope of a side of the first conductive portion is the same as a slope of a sidewall of the recess adjacent to the side.
4 . The display panel according to claim 3 , wherein the side of the first conductive portion and the sidewall of the recess adjacent to the side are coplanar.
5 . The display panel according to claim 1 , wherein a slope of a side of the first conductive portion is less than a slope of a sidewall of the recess adjacent to the side.
6 . The display panel according to claim 1 , wherein a side of the first conductive portion is non-planar, and comprises a first inclined face and a second inclined face, wherein a slope of the first inclined face is less than a slope of the second inclined face, wherein an angle formed by the first inclined face and the second inclined face is an obtuse angle, and wherein an angle formed by the first inclined face and a surface of the backplate where the first conductive portion is located is an acute angle.
7 . The display panel according to claim 6 , wherein the first conductive portion comprises a first layer on the backplate, a second layer on the first layer, and a third layer on the second layer.
8 . The display panel according to claim 7 , wherein the first inclined face is a side of the first layer and wherein the second inclined face is a formed by a side of the second layer and a side of the third layer together.
9 . The display panel according to claim 1 , wherein a sidewall of the recess comprises an inner recessed structure recessed toward an interior of the backplate and located at a position of the sidewall of the recess that is in proximity to the first conductive portion.
10 . The display panel according to claim 9 , wherein a depth of the inner recessed structure is less than a width of an orthographic projection of the first inclined face on the backplate.
11 . The display panel according to claim 1 , wherein the bottom surface of the recess comprises a sub-recess having at least one of the following parameters:
i) a width substantially equal to a distance between the extension portions in a same recess, of adjacent second conductive portions, or
ii) a depth of the sub-recess is not greater than ⅓ of a minimum depth of the recesses.
12 . The display panel according to claim 1 , wherein an inclination angle of the connecting portion of the second conductive portion with respect to the extension portion is less than or equal to an inclination angle of the sidewall of the first recessed portion with respect to the bottom.
13 . The display panel according to claim 1 , further comprising:
a light-emitting functional layer on a side of the pixel definition layer opposite the backplate; and
a second electrode on a side of the light-emitting functional layer opposite the backplate.
14 . The display panel according to claim 13 , wherein the light-emitting functional layer comprises:
a first light-emitting functional sublayer on a side of the pixel definition layer opposite the backplate and configured to emit a first color light;
a charge generating layer on a side of the first light-emitting functional sublayer opposite the backplate;
a second light-emitting functional sublayer on a side of the charge-generating layer opposite the backplate and configured to emit light of a second color; and
a third light-emitting functional sublayer on a side of the second light-emitting functional sublayer opposite the backplate and configured to emit light of a third color.
15 . The display panel according to claim 13 , wherein the second electrode comprises:
a plurality of second flat portions corresponding to the plurality of first electrodes, respectively, an orthographic projection of each second flat portion on the backplate is within an orthographic projection of the corresponding first electrode on the backplate; and
a plurality of second recessed portions corresponding to the plurality of recesses, respectively, and an orthographic projection of each second recessed portion on the back plate covering an orthographic projection of the corresponding recess on the back plate.
16 . A display device comprising a display panel according to claim 1 .