The present application is a national stage entry of PCT International Application No. PCT/CN2020/132144, filed on Nov. 27, 2020, which claims priority to PCT International Application No. PCT/CN2019/122129, filed on Nov. 29, 2019. The entire content of PCT International Application No. PCT/CN2020/132144 and the entire content of PCT International Application No. PCT/CN2019/122129 are incorporated herein by reference as part of the present application.

TECHNICAL FIELD

At least one embodiment of the present disclosure relates to a display substrate and a display device.

BACKGROUND

Organic light emitting diodes have advantages of self-luminescence, high efficiency, bright color, thin and light, power saving, curling, wide using temperature range, and so on, and have been gradually applied to fields such as large-area display, lighting, vehicle display, and the like.

SUMMARY

At least an embodiment of the present disclosure provides a display substrate and a display device. The display substrate comprises: a base substrate and a plurality of first color sub-pixels, a plurality of second color sub-pixels and a plurality of third color sub-pixels disposed on the base substrate; a light emitting control signal line, extending along a first direction; a data line, extending along a second direction, the first direction being intersected with the second direction; and a power line, overlapping with the data line in a third direction perpendicular to the base substrate, wherein at least one sub-pixel comprises an organic light emitting element and a pixel circuit for driving the organic light emitting element, the organic light emitting element comprises a first electrode, a second electrode and a light emitting layer disposed between the first electrode and the second electrode; the pixel circuit comprises a driving transistor and a first light emitting control transistor, and the pixel circuit further comprises a connection structure disposed in the same layer as the data line, in at least one second color sub-pixel, a first electrode of the first light emitting control transistor of the second color sub-pixel is electrically connected with the connection structure through a first connection hole, and the connection structure is electrically connected with the second electrode of the second color sub-pixel through a second connection hole, an orthographic projection of at least part of the first connection hole on the base substrate is located on a side of an orthographic projection of the light emitting control signal line on the base substrate, and an orthographic projection of at least part of the second connection hole on the base substrate is located on the other side of the orthographic projection of the light emitting control signal line on the base substrate; in at least one third color sub-pixel, the second electrode of the third color sub-pixel does not overlap with a channel of the driving transistor controlling the organic light emitting element of the third color sub-pixel in the third direction.

For example, in at least one embodiment of the disclosure, the second electrode of at least one third color sub-pixel does not overlap with the channels of the driving transistors controlling organic light emitting elements of the sub-pixels of the other colors in the third direction.

For example, in at least one embodiment of the disclosure, the display substrate comprises an active semiconductor layer including the channel and a source-drain region of each transistor of each sub-pixel, and the connection structure is electrically connected with the active semiconductor layer through the first connection hole in an inorganic layer between the connection structure and the active semiconductor layer; the connection structure is electrically connected with the second electrode through the second connection hole in at least one of an organic layer and an inorganic layer between the connection structure and the second electrode, and in the second color sub-pixel, a center of the orthographic projection of the first connection hole on the base substrate and a center of the orthographic projection of the second connection hole on the base substrate are respectively located on both sides of the orthographic projection of the light emitting control signal line on the base substrate.

For example, in at least one embodiment of the disclosure, in at least one second color sub-pixel, the orthographic projection of the first connection hole on the base substrate is farther away from an orthographic projection of the second electrode on the base substrate compared with the orthographic projection of the second connection hole on the base substrate.

For example, in at least one embodiment of the disclosure, in at least one second color sub-pixel, the second electrode of the second color sub-pixel overlaps with the channel of the driving transistor driving the organic light emitting element of the second color sub-pixel in the third direction.

For example, in at least one embodiment of the disclosure, the data line connected to the pixel circuit of at least one second color sub-pixel and the second electrode of the at least one second color sub-pixel are spaced apart from each other in the first direction.

For example, in at least one embodiment of the disclosure, the second electrode of the at least one second color sub-pixel and the data line connected to the pixel circuit of the third color sub-pixel overlap in the third direction.

For example, in at least one embodiment of the disclosure, an orthographic projection of the second electrode of at least one first color sub-pixel and an orthographic projection of the second electrode of at least one third color sub-pixel on a first straight line extending along the second direction overlap with an orthographic projection of the connection structure of at least one second color sub-pixel on the first straight line.

For example, in at least one embodiment of the disclosure, an orthographic projection of the second electrode of at least one third color sub-pixel on a second straight line extending along the first direction overlaps with an orthographic projection of the connection structure of at least one second color sub-pixel on the second straight line.

For example, in at least one embodiment of the disclosure, the second electrode of at least one sub-pixel comprises a main electrode and a connection electrode electrically connected with the first light emitting control transistor, an orthographic projection of the main electrode of at least one first color sub-pixel on the first straight line overlaps with the orthographic projection of the connection structure of the at least one second color sub-pixel on the first straight line.

For example, in at least one embodiment of the disclosure, an orthographic projection of the main electrode of the at least one third color sub-pixel on the second straight line overlaps with the orthographic projection of the connection structure of the at least one second color sub-pixel on the second straight line.

For example, in at least one embodiment of the disclosure, the display substrate further comprises: a scanning signal line and a reset control signal line, wherein, in at least one sub-pixel, the pixel circuit further comprises a data writing transistor and a reset transistor, a gate electrode of the data writing transistor is configured to be electrically connected with the scanning signal line to receive a scan signal, and a gate electrode of the reset transistor is configured to be electrically connected with the reset control signal line to receive a reset control signal.

For example, in at least one embodiment of the disclosure, in at least one sub-pixel, the pixel circuit further comprises a second light emitting control transistor, and a gate electrode of the first light emitting control transistor and a gate electrode of the second light emitting control transistor are both electrically connected with the light emitting control signal line to receive a light emitting control signal.

For example, in at least one embodiment of the disclosure, the second electrode of at least one second color sub-pixel overlaps with the scanning signal line in the third direction.

For example, in at least one embodiment of the disclosure, the second electrode of at least one second color sub-pixel overlaps with the scanning signal line electrically connected with the pixel circuit of the second color sub-pixel in the third direction.

For example, in at least one embodiment of the disclosure, both of the second electrode of at least one first color sub-pixel and the second electrode of at least one third color sub-pixel overlap with the light emitting control signal line in the third direction.

For example, in at least one embodiment of the disclosure, the second electrode of at least one first color sub-pixel comprises a first electrode sub-part and a second electrode sub-part located on both sides of the light emitting control signal line, respectively, and an area of the first electrode sub-part is larger than that of the second electrode sub-part; in at least one first color sub-pixel, a center of the orthographic projection of the second connection hole on the base substrate and an orthographic projection of the first electrode sub-part on the base substrate are located on both sides of the orthographic projection of the light emitting control signal line on the base substrate, respectively.

For example, in at least one embodiment of the disclosure, in at least one sub-pixel, the pixel circuit further comprises a storage capacitor, a second electrode of the storage capacitor is also used as a gate electrode of the driving transistor, and an area of the second electrode of the storage capacitor of at least one first color sub-pixel is different from that of the second electrode of the storage capacitor of at least one second color sub-pixel.

For example, in at least one embodiment of the disclosure, an area of the second electrode of at least one first color sub-pixel is greater than an area of the second electrode of at least one second color sub-pixel, and the area of the second electrode of the storage capacitor of at least one first color sub-pixel is greater than that of the second electrode of the storage capacitor of at least one second color sub-pixel.

For example, in at least one embodiment of the disclosure, in at least one second color sub-pixel, a first electrode of the storage capacitor overlaps with the connection structure in the third direction.

For example, in at least one embodiment of the disclosure, in at least one sub-pixel, the channel of the driving transistor of the sub-pixel comprises a plurality of channel sub-parts connected in sequence, at least part of the plurality of channel sub-parts extend along the first direction, and orthographic projections of two channel sub-parts extending along the first direction on the second straight line do not overlap.

For example, in at least one embodiment of the disclosure, the plurality of channel sub-parts comprise five channel sub-parts connected in sequence, three of the five channel sub-parts extend along the first direction, orthographic projections of two of the three channel sub-parts on the second straight line do not overlap, orthographic projections of two of the three channel sub-parts on the first straight line overlap, and orthographic projections of two channel sub-parts except the three channel sub-parts of the five channel sub-parts on the first straight line overlap.

For example, in at least one embodiment of the disclosure, the five channel sub-parts comprise a first channel sub-part, a second channel sub-part, a third channel sub-part, a fourth channel sub-part and a fifth channel sub-part, which are connected in sequence, the first channel sub-part, the third channel sub-part, and the fifth channel sub-part extend along the first direction, the first channel sub-part and the third channel sub-part are parallel to each other, and the first channel sub-part and the fifth channel sub-part are crossed by a third straight line extending along the first direction and orthographic projections of the first channel sub-part and the fifth channel sub-part on the second straight line do not overlap, and the second channel sub-part and the fourth channel sub-part extend along the second direction and are parallel to each other.

For example, in at least one embodiment of the disclosure, the display substrate further comprises: a pixel defining layer located at a side of the second electrode of each sub-pixel away from the base substrate, wherein the pixel defining layer comprises an opening for defining a light emitting region of each sub-pixel, at least part of the organic light emitting layer of each sub-pixel is located in the opening, and an orthographic projection of the opening of the pixel defining layer on the base substrate is located in an orthographic projection of the main electrode of the second electrode of each sub-pixel on the base substrate; in the pixel defining layer, an area of an opening defining a light emitting region of each third color sub-pixel is greater than an area of an opening defining a light emitting region of each second color sub-pixel and smaller than an area of an opening defining a light emitting region of each first color sub-pixel.

For example, in at least one embodiment of the disclosure, the second electrode of at least one first color sub-pixel overlaps with the data line in the third direction, and a length of an overlapped portion of the second electrode and the data line in the second direction is greater than 80% of a maximum length of the second electrode in the second direction.

For example, in at least one embodiment of the disclosure, the second electrode of at least one first color sub-pixel overlaps with the power line in the third direction, and a length of an overlapped portion of the second electrode and the power line in the second direction is greater than 80% of a maximum length of the second electrode in the second direction.

For example, in at least one embodiment of the disclosure, in at least one second color sub-pixel, the orthographic projection of the first connection hole on the base substrate has a first area, the orthographic projection of the second connection hole on the base substrate has a second area, and the first area is different from the second area.

For example, in at least one embodiment of the disclosure, in at least one second color sub-pixel, the first connection hole has a first distance from the light emitting control signal line in the second direction, the second connection hole has a second distance from the light emitting control signal line in the second direction, and the first distance is different from the second distance.

Another embodiment of the disclosure provides a display device, comprising the display substrate as mentioned above.

