US-12628501-B2 - Display substrate and display device

US12628501B2US 12628501 B2US12628501 B2US 12628501B2US-12628501-B2

Abstract

A display substrate includes a light emitting structure layer disposed on a base substrate, the light emitting structure layer includes a first electrode layer, a pixel definition layer, a light emitting functional layer and a second electrode layer; the first electrode layer includes multiple first electrodes; the pixel definition layer is disposed on a side of the first electrodes away from the base substrate, and is provided with multiple pixel openings and multiple flow channels; the pixel openings expose surfaces of the first electrodes away from the base substrate, each flow channel is located between two adjacent pixel openings in the first direction and communicates the two adjacent pixel openings in the first direction; the light emitting functional layer includes a first functional layer and a light emitting layer that are stacked; the first functional layer is disposed on surfaces of the first electrodes away from the base substrate.

Inventors

Longfei Yan
Di Wu

Assignees

HEFEI BOE JOINT TECHNOLOGY CO., LTD.
BOE TECHNOLOGY GROUP CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220630

Claims (18)

1 . A display substrate, comprising a display area and a non-display area located on a periphery of the display area; the display area comprises a driving structure layer and a light emitting structure layer stacked sequentially on a base substrate, wherein the light emitting structure layer comprises a first electrode layer, a pixel definition layer, a light emitting functional layer, and a second electrode layer; the first electrode layer comprises a plurality of first electrodes disposed on a side of the driving structure layer away from the base substrate; the pixel definition layer is disposed on a side of the plurality of first electrodes away from the base substrate, and is provided with a plurality of pixel openings and a plurality of flow channels; the plurality of pixel openings expose surfaces of the first electrodes away from the base substrate, a flow channel of the plurality of flow channels is located between each two adjacent pixel openings in a first direction and the plurality of flow channels communicate all the two adjacent pixel openings in the first direction; the light emitting functional layer comprises a first functional layer and a light emitting layer stacked sequentially along a direction away from the base substrate; the first functional layer is disposed on the surfaces of the plurality of first electrodes away from the base substrate, the first functional layer comprises one film layer or more film layers, at least one film layer of the first functional layer is located in the plurality of pixel openings and the plurality of flow channels; the light emitting layer is disposed on a surface of the first functional layer away from the base substrate and is located in the pixel openings; and the second electrode layer is disposed on a surface of the light emitting functional layer away from the base substrate, and a first electrode, the light emitting functional layer, and the second electrode layer are sequentially stacked to form a light emitting device; the plurality of flow channels are provided to enable, when the one film layer or more film layers of the first functional layer are formed by an ink jet printing process, the ink forming the first functional layer to flow between the plurality of pixel openings located in the first direction through the plurality of flow channels.
2 . The display substrate according to claim 1 , wherein the pixel definition layer is in a single layer structure; or the pixel definition layer comprises a first pixel definition layer and a second pixel definition layer; the first pixel definition layer is disposed on the side of the plurality of first electrodes away from the base substrate, and is provided with a plurality of first pixel openings and the plurality of flow channels, the first pixel openings expose the surfaces of the first electrodes away from the base substrate, each flow channel is located between two adjacent first pixel openings in the first direction; the second pixel definition layer is disposed at a side of the first pixel definition layer away from the base substrate, and is provided with a plurality of second pixel openings, positions of the second pixel openings and positions of the first pixel openings correspond to each other, and the second pixel openings and the first pixel openings jointly form the pixel openings, and the plurality of second pixel openings expose two ports of each of the plurality of flow channels.
3 . The display substrate according to claim 2 , wherein the first pixel definition layer comprises a first sublayer and a second sublayer; the first sublayer is disposed on the side of the plurality of first electrodes away from the base substrate and is provided with the plurality of first pixel openings; the second sublayer is disposed on a surface of the first sublayer away from the base substrate, and the second sublayer comprise a plurality of connection portions, and a connection portion is provided with a flow channel and is located between two adjacent first pixel openings in the first direction.
4 . The display substrate according to claim 3 , wherein the second pixel definition layer is in a single layer structure; or the second pixel definition layer comprises a third sublayer and a fourth sublayer; the third sublayer is disposed on a side of the first sublayer and the plurality of connection portions away from the base substrate, and is provided with the plurality of second pixel openings; the fourth sublayer is disposed on a side of the third sublayer away from the base substrate, the fourth sublayer comprises a plurality of second banks extending along a second direction, the second direction intersects with the first direction, and the plurality of second banks are disposed at intervals in the first direction; the plurality of pixel openings are disposed in a plurality of rows and a plurality of columns, a plurality of pixel openings disposed along the first direction are a column of pixel openings, a plurality of pixel openings disposed along the second direction are a row of pixel openings, and a row of pixel openings is disposed between two adjacent second banks; and a surface of the first functional layer away from the base substrate is not higher than a surface of the third sublayer away from the base substrate, and the light emitting layer is further disposed on the surface of the third sublayer away from the base substrate.
5 . The display substrate according to claim 4 , wherein the pixel definition layer extends to the non-display area and a circumferential edge of the pixel definition layer is located in the non-display area; the fourth sublayer further comprises two first banks located in the non-display area and extending along the first direction, and two second banks located in the non-display area and the two first banks form a circumferential edge of the fourth sublayer.
6 . The display substrate according to claim 4 , wherein a material of the third sublayer is a hydrophilic material, and a material of the fourth sublayer is a hydrophobic material.
7 . The display substrate according to claim 3 , wherein materials of the first sublayer and the second sublayer are both hydrophilic materials.
8 . The display substrate according to claim 2 , wherein the first pixel definition layer is in a single layer structure; or, the first pixel definition layer comprises a first sublayer and a second sublayer; the first sublayer is disposed on the side of the plurality of first electrodes away from the base substrate and is provided with a plurality of first openings; the second sublayer is disposed on a surface of the first sublayer away from the base substrate, and is provided with a plurality of second openings and the plurality of flow channels, positions of the second openings and positions of the first openings correspond to each other, and the second openings and the first openings jointly form the first pixel openings.
9 . The display substrate according to claim 1 , wherein the pixel definition layer comprises a first pixel definition layer and a second pixel definition layer; the first pixel definition layer is disposed at the side of the plurality of first electrodes away from the base substrate, and is provided with the plurality of pixel openings and the plurality of flow channels; the second pixel definition layer is disposed on a side of the first pixel definition layer away from the base substrate, the second pixel definition layer comprises a plurality of second banks extending along a second direction, the second direction intersects with the first direction, the plurality of second banks are disposed at intervals in the first direction, and the second pixel definition layer exposes two ports of each of the plurality of flow channels; the plurality of pixel openings are disposed in a plurality of rows and a plurality of columns, a plurality of pixel openings disposed along the first direction are a column of pixel openings, a plurality of pixel openings disposed along the second direction are a row of pixel openings, and a row of pixel openings is disposed between two adjacent second banks; and a surface of the first functional layer away from the base substrate is not higher than a surface of the first pixel definition layer away from the base substrate, and the light emitting layer is further disposed on the surface of the first pixel definition layer away from the base substrate.
10 . The display substrate according to claim 9 , wherein the pixel definition layer extends to the non-display area and a circumferential edge of the pixel definition layer is located in the non-display area; the second pixel definition layer further comprises two first banks located in the non-display area and extending along the first direction, and two second banks located in the non-display area and the two first banks form a circumferential edge of the second pixel definition layer.
11 . The display substrate according to claim 9 , wherein the first pixel definition layer is in a single layer structure; or, the first pixel definition layer comprises a first sublayer and a second sublayer; and the first sublayer is disposed on the side of the plurality of first electrodes away from the base substrate and is provided with a plurality of first openings; the second sublayer is disposed on a surface of the first sublayer away from the base substrate, and is provided with a plurality of second openings and the plurality of flow channels, positions of the second openings and positions of the first opening correspond to each other, and the second openings and the first openings jointly form the pixel openings.
12 . The display substrate according to claim 8 , wherein a material of the first pixel definition layer is a hydrophilic material, and a material of the second pixel definition layer is a hydrophobic material.
13 . The display substrate according to claim 1 , wherein the plurality of pixel openings are disposed in a plurality of rows and a plurality of columns, a plurality of pixel openings disposed along the first direction is a column of pixel openings, and a plurality of pixel openings disposed along a second direction is a row of pixel openings, and the first direction intersects with the second direction; a distance between two adjacent pixel openings in the first direction is less than a distance between two adjacent pixel openings in the second direction.
14 . The display substrate according to claim 1 , wherein the display area comprises a plurality of pixel units arranged in an array on the base substrate, the pixel units comprises a plurality of sub-pixels sequentially arranged along the first direction, and a plurality of sub-pixels located in a second direction emit light of a same color, and the first direction intersects with the second direction.
15 . The display substrate according to claim 1 , wherein at least one film layer of the first functional layer comprises a plurality of first extension portions extending along the first direction, and the first extension portions are in an integral structure and located in the plurality of pixel openings and the plurality of flow channels in the first direction.
16 . The display substrate according to claim 1 , wherein the first functional layer comprises a hole injection layer and a hole transport layer stacked sequentially in the direction away from the base substrate, and the hole injection layer and the hole transport layer are each located in the plurality of pixel openings and the plurality of flow channels.
17 . A display device, comprising the display substrate according to claim 1 .
18 . The display substrate according to claim 9 , wherein a material of the first pixel definition layer is a hydrophilic material, and a material of the second pixel definition layer is a hydrophobic material.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application is a U.S. National Phase Entry of International Application PCT/CN2022/102787 having an international filing date of Jun. 30, 2022, and entitled “Display Substrate and Display Device”, the contents of the above-identified application should be construed as being hereby incorporated by reference in its entirety. TECHNICAL FIELD Embodiments of the present disclosure relate to, but are not limited to, the field of display technologies, and more particularly to a display substrate and a display device. BACKGROUND At present, organic light emitting diode (OLED) display products are gradually replacing liquid crystal display (LCD) products due to advantages such as wide color gamut, low power consumption and fast response speed. At present, in most OLED display products on the market, organic film layers of OLED devices are made by evaporation technology, which has some shortcomings, such as a low material utilization rate and a high production cost. Therefore, many enterprises and research institutions have turned their attention to development of ink jet printing OLED technology. Ink jet printing is a technology that uses solution method to prepare an OLED material into ink, ejects the ink into a pixel opening of a specified sub-pixel through a nozzle, and then dries it to form a film. Compared with the evaporation technology, the ink jet printing technology not only reduces material waste, but also reduces use of MASK plates (MASK) and a cost of maintaining a high vacuum environment in the evaporation technology, and the like. However, in an actual printing process, ink droplets will shift in angle and drip into adjacent sub-pixels by mistake because of an accuracy of the nozzle and a problem of ink materials, resulting in differences between ink volumes in different sub-pixels, and a problem of uneven film thickness after final drying and film formation. For example, in the manufacturing of a hole injection layer (HIL), being limited by the ink, a phenomenon of deviation of ink droplets is more obvious, which will lead to obvious bright and dark lines in a display device ultimately manufactured and affect a performance of the display device. SUMMARY The following is a summary of subject matter described herein in detail. The summary is not intended to limit the protection scope of claims. An embodiment of the present disclosure provides a display substrate, which includes a display area and a non-display area on a periphery of the display area; the display area includes a driving structure layer and a light emitting structure layer stacked sequentially on a base substrate, wherein the light emitting structure layer includes a first electrode layer, a pixel definition layer, a light emitting functional layer, and a second electrode layer; the first electrode layer includes multiple first electrodes disposed on a side of the driving structure layer away from the base substrate;the pixel definition layer is disposed on a side of the multiple first electrodes away from the base substrate, and is provided with multiple pixel openings and multiple flow channels; each pixel opening exposes a surface of a first electrode away from the base substrate, each flow channel is located between two adjacent pixel openings in a first direction and communicates the two adjacent pixel openings in the first direction;the light emitting functional layer includes a first functional layer and a light emitting layer stacked sequentially along a direction away from the base substrate; the first functional layer is disposed on surfaces of the multiple first electrodes away from the base substrate, the first functional layer includes one film layer or more film layers, at least one film layer of the first functional layer is located in the multiple pixel openings and the multiple flow channels; the light emitting layer is disposed on a surface of the first functional layer away from the base substrate and is located in the pixel openings;the second electrode layer is disposed on a surface of the light emitting functional layer away from the base substrate, and the first electrodes, the light emitting functional layer, and the second electrode layer are sequentially stacked to form light emitting devices. An embodiment of the present disclosure further provides a display device including the display substrate described above. Other aspects may be understood upon reading and understanding of the drawings and the detailed description. BRIEF DESCRIPTION OF DRAWINGS Accompanying drawings are intended to provide a further understanding of technical solutions of the present disclosure and form a part of the specification, and are used to explain the technical solutions of the present disclosure together with embodiments of the present disclosure, and not intended to form limitations on the technical solutions of the present disclosure. Shapes and sizes of components in the drawing