Display substrate and display device

Abstract

A display substrate and a display device. The display substrate comprises a back plate (101), a reflective layer (202), and light-emitting functional layers. The light-emitting functional layers comprise a first light-emitting functional layer, a second light-emitting functional layer, and a third light-emitting functional layer. The first light-emitting functional layer comprises a first light-emitting layer, and the first light-emitting layer is configured to emit blue light under the action of an electric field; the second light-emitting functional layer comprises a second light-emitting layer, and the second light-emitting layer is configured to emit red light under the action of the electric field; and the third light-emitting functional layer comprises a third light-emitting layer, and the third light-emitting layer is configured to emit green light under the action of the electric field. The display substrate comprises a first sub-pixel (P1), a second sub-pixel (P2), and a third sub-pixel (P3). The first sub-pixel (P1) has a first distance, the second sub-pixel (P2) has a second distance, and the third sub-pixel (P3) has a third distance. Among the first distance, the second distance, and the third distance, the second distance is the greatest.

Description

Display substrate and display device Technical Field

[0001] This article relates to, but is not limited to, the field of display technology, and in particular to a display substrate and a display device. Background Technology

[0002] Currently, Virtual Reality (VR) and Augmented Reality (AR) technologies are gradually penetrating industries such as entertainment, education, and healthcare. Small-sized, high-resolution microdisplay devices are ideally suited for AR / VR products. OLED (Organic Light-Emitting Diode) microdisplay devices, due to their advantages such as thinness, excellent image quality, foldability, and low power consumption, are increasingly being used in AR / VR display products. Therefore, developing high-efficiency OLED devices is crucial.

[0003] Summary of the Invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0005] This disclosure provides a display substrate and a display device.

[0006] In one aspect, this disclosure provides a display substrate. The display substrate includes a plurality of sub-pixels, the plurality of sub-pixels including at least a first sub-pixel, a second sub-pixel, and a third sub-pixel; the first sub-pixel is configured to emit blue light, the second sub-pixel is configured to emit red light, and the third sub-pixel is configured to emit green light;

[0007] The display substrate includes a back plate, a reflective layer on the back plate, and a light-emitting functional layer on the side of the reflective layer away from the back plate; the light-emitting functional layer includes at least a first light-emitting functional layer, a second light-emitting functional layer, and a third light-emitting functional layer, wherein the first light-emitting functional layer includes a first light-emitting layer configured to emit blue light under the action of an electric field, the second light-emitting functional layer includes a second light-emitting layer configured to emit red light under the action of an electric field, and the third light-emitting functional layer includes a third light-emitting layer configured to emit green light under the action of an electric field;

[0008] The first sub-pixel includes a first light-emitting functional layer and has a first distance, which refers to the maximum distance between the first light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate; the second sub-pixel includes a second light-emitting functional layer and has a second distance, which refers to the minimum distance between the second light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate; the third sub-pixel includes a third light-emitting functional layer and has a third distance, which refers to the maximum distance between the third light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate.

[0009] Among the first distance, the second distance, and the third distance, the second distance is the largest.

[0010] In one exemplary embodiment, the first distance ranges from 110 nanometers to 220 nanometers; the second distance ranges from 180 nanometers to 290 nanometers; and the third distance ranges from 150 nanometers to 260 nanometers.

[0011] In one exemplary embodiment, the display substrate further includes a light adjustment layer located between the reflective layer and the light-emitting functional layer.

[0012] In an exemplary embodiment, the light-emitting functional layer is in contact with the light-modulating layer, and the material of the light-modulating layer is a conductive material.

[0013] In one exemplary embodiment, the display substrate further includes a connecting electrode layer, a portion of which is located between the light-emitting functional layer and the light-modulating layer;

[0014] The material of the connecting electrode layer is a transparent conductive material, and the material of the light modulation layer is a non-conductive material.

[0015] In an exemplary embodiment, the connection electrode layer includes at least a first connection electrode, a second connection electrode, and a third connection electrode; the first light-emitting functional layer contacts the side of the first connection electrode away from the back plate, and the side of the first connection electrode near the back plate contacts the reflective layer; the second light-emitting functional layer contacts the side of the second connection electrode away from the back plate, and the side of the second connection electrode near the back plate contacts the reflective layer; the third light-emitting functional layer contacts the side of the third connection electrode away from the back plate, and the side of the third connection electrode near the back plate contacts the reflective layer.

[0016] In an exemplary embodiment, the connection electrode layer includes at least a first connection electrode and a second connection electrode; the first light-emitting functional layer contacts the side of the first connection electrode away from the back plate, and the side of the first connection electrode near the back plate contacts the reflective layer; the second light-emitting functional layer contacts the side of the second connection electrode away from the back plate, and the side of the second connection electrode near the back plate contacts the reflective layer; the third light-emitting functional layer contacts the reflective layer, and the orthographic projection of the light-adjusting layer onto the plane of the back plate does not overlap with the orthographic projection of the third light-emitting functional layer onto the plane of the back plate.

[0017] In an exemplary embodiment, the display substrate further includes a pixel definition layer located on the side of the light adjustment layer away from the back panel; the pixel definition layer has at least a first opening, a second opening, and a third opening; the first sub-pixel emits blue light through the first opening, the second sub-pixel emits red light through the second opening, and the third sub-pixel emits green light through the third opening;

[0018] The display substrate includes at least a first via, a second via, and a third via. At least a portion of the first connecting electrode is located within the first via and in contact with the reflective layer, and the orthographic projection of the first opening onto the plane of the back panel is located within the orthographic projection of the first connecting electrode onto the plane of the back panel. At least a portion of the second connecting electrode is located within the second via and in contact with the reflective layer, and the orthographic projection of the second opening onto the plane of the back panel is located within the orthographic projection of the second connecting electrode onto the plane of the back panel. At least a portion of the third connecting electrode is located within the third via and in contact with the reflective layer, and the orthographic projection of the third opening onto the plane of the back panel is located within the orthographic projection of the third connecting electrode onto the plane of the back panel.

[0019] In an exemplary embodiment, the orthographic projection of the first opening onto the plane of the back panel does not overlap with the orthographic projection of the first through hole onto the plane of the back panel; the orthographic projection of the second opening onto the plane of the back panel does not overlap with the orthographic projection of the second through hole onto the plane of the back panel; the orthographic projection of the third opening onto the plane of the back panel does not overlap with the orthographic projection of the third through hole onto the plane of the back panel, or the orthographic projection of the third opening onto the plane of the back panel is located within the orthographic projection of the third through hole onto the plane of the back panel.

[0020] In an exemplary embodiment, the orthographic projection of the third opening onto the plane of the back panel is located within the orthographic projection of the third via onto the plane of the back panel, and the orthographic projection of the light-adjusting layer onto the plane of the back panel does not overlap with the orthographic projection of the third light-emitting functional layer onto the plane of the back panel.

[0021] In one exemplary embodiment, the light-modulating layer is a single film layer, or the light-modulating layer comprises two or more film layers.

[0022] In an exemplary embodiment, the light adjustment layer includes at least a first adjustment portion, a second adjustment portion, and a third adjustment portion; the orthographic projection of the first adjustment portion onto the plane of the back panel at least partially overlaps with the orthographic projection of the first light-emitting functional layer onto the plane of the back panel, and the orthographic projection of the second adjustment portion onto the plane of the back panel at least partially overlaps with the orthographic projection of the second light-emitting functional layer onto the plane of the back panel, and the orthographic projection of the third adjustment portion onto the plane of the back panel at least partially overlaps with the orthographic projection of the third light-emitting functional layer onto the plane of the back panel;

[0023] In this embodiment, at least a portion of the film layers of at least two of the first adjustment portion, the second adjustment portion, and the third adjustment portion are of the same layer structure. In an exemplary embodiment, the first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer are of the same layer structure.

[0024] In one exemplary embodiment, the first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer each include the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer stacked together. In another exemplary embodiment, the first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer further include at least one of a hole transport layer, an electron transport layer, and a charge generation layer.

[0025] In one exemplary embodiment, the display substrate further includes a pixel definition layer located on the side of the light adjustment layer away from the back panel; the pixel definition layer has a plurality of pixel openings, the plurality of pixel openings including at least a first opening, a second opening and a third opening; the first sub-pixel emits blue light through the first opening, the second sub-pixel emits red light through the second opening, and the third sub-pixel emits green light through the third opening;

[0026] The pixel definition layer also has multiple partition slots, which are located between two adjacent pixel openings.

[0027] In an exemplary embodiment, the wall of the partition groove includes a first section and a second section connected to each other, and the first section is farther away from the back plate than the second section; the first section has a first aperture, the second section has a second aperture, and the first aperture is smaller than the second aperture.

[0028] On the other hand, embodiments of this disclosure provide a display device including the display substrate described in any of the foregoing embodiments.

[0029] In an exemplary embodiment, the display device further includes a color filter structure layer; the color filter structure layer includes a red light filter, a green light filter, and a blue light filter; the orthographic projection of the blue light filter onto the plane of the back panel at least partially overlaps with the orthographic projection of the first light-emitting functional layer onto the plane of the back panel, the orthographic projection of the red light filter onto the plane of the back panel at least partially overlaps with the orthographic projection of the second light-emitting functional layer onto the plane of the back panel, and the orthographic projection of the green light filter onto the plane of the back panel at least partially overlaps with the orthographic projection of the third light-emitting functional layer onto the plane of the back panel.

[0030] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood.

[0031] Overview of the attached figures

[0032] The accompanying drawings are provided to illustrate the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure. The shape and size of one or more components in the drawings do not reflect actual proportions and are only intended to illustrate the content of this disclosure.

[0033] Figure 1 is a schematic diagram of the structure of a display device according to an embodiment of the present disclosure;

[0034] Figure 2 is a schematic planar structure diagram of a display device according to an embodiment of the present disclosure;

[0035] Figure 3 is a cross-sectional schematic diagram of a display device according to an embodiment of the present disclosure;

[0036] Figure 4A is a schematic diagram of the film layer structure of a display substrate according to an embodiment of the present disclosure;

[0037] Figure 4B is a schematic diagram of the film layer structure of a display substrate according to an embodiment of the present disclosure.

[0038] Figure 5 is a cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure;

[0039] Figure 6 is a cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure;

[0040] Figure 7A is a cross-sectional schematic diagram of the display substrate after the first electrode layer pattern is formed according to an embodiment of the present disclosure;

[0041] Figure 7B is a cross-sectional schematic diagram of the display substrate after the reflective layer pattern is formed in an embodiment of the present disclosure;

[0042] Figure 7C is a cross-sectional schematic diagram of the display substrate after a planarization layer pattern has been formed in an embodiment of the present disclosure;

[0043] Figure 7D is a cross-sectional schematic diagram of the display substrate after the connection electrode layer pattern is formed in an embodiment of the present disclosure;

[0044] Figure 7E is a cross-sectional view of the display substrate after forming a pixel definition layer pattern according to an embodiment of the present disclosure.

[0045] Detailed Explanation

[0046] The embodiments of this disclosure will now be described with reference to the accompanying drawings. The implementation can be carried out in many different forms. Those skilled in the art will readily understand that the methods and content can be transformed into one or more forms without departing from the spirit and scope of this disclosure. Therefore, this disclosure should not be construed as limited to the content described in the following embodiments. Without conflict, the embodiments and features in the embodiments of this disclosure can be arbitrarily combined with each other.

[0047] In the accompanying drawings, the size of one or more constituent elements, the thickness of layers, or areas are sometimes exaggerated for clarity. Therefore, this disclosure is not necessarily limited to these dimensions, and the shape and size of one or more parts in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate ideal examples, and this disclosure is not limited to the shapes or values ​​shown in the drawings.

[0048] The ordinal numbers such as "first," "second," and "third" in this disclosure are used to avoid confusion among the constituent elements, not to limit the quantity. "Multiple" in this disclosure includes two or more quantities.

[0049] In this disclosure, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification of the specification, and does not imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately changed depending on the direction in which the constituent elements are described. Therefore, the description is not limited to the terms used in the specification and may be appropriately replaced as appropriate.

[0050] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art will understand the meaning of these terms in this disclosure as appropriate.

[0051] In this disclosure, "electrical connection" includes the situation where constituent elements are connected together by a component having a certain electrical function. There are no particular limitations on the "component having a certain electrical function," as long as it enables the transmission of electrical signals between the connected constituent elements. Examples of "component having a certain electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other components having one or more functions.

[0052] In this disclosure, a transistor is a device that includes at least three terminals: a gate electrode, a drain electrode, and a source electrode. A transistor has a channel region between the drain electrode (drain electrode terminal, drain region, or drain) and the source electrode (source electrode terminal, source region, or source), and current can flow through the drain electrode, the channel region, and the source electrode. In this disclosure, the channel region refers to the region through which current primarily flows.

[0053] In this disclosure, the first electrode can be the drain electrode and the second electrode can be the source electrode, or vice versa. In cases where transistors with opposite polarities are used or the current direction changes during circuit operation, the functions of the "source electrode" and the "drain electrode" are sometimes interchanged. Therefore, in this disclosure, the "source electrode" and the "drain electrode" can be interchanged.

[0054] In this disclosure, "parallel" refers to a state in which the angle formed by two straight lines is greater than or equal to -10° and less than 10°, and therefore can include a state in which the angle is greater than or equal to -5° and less than 5°. Furthermore, "perpendicular" refers to a state in which the angle formed by two straight lines is greater than or equal to 80° and less than 100°, and therefore can include a state in which the angle is greater than or equal to 85° and less than 95°.

[0055] In this disclosure, the terms "film" and "layer" can be interchanged. For example, sometimes "conductive layer" can be replaced with "conductive film". Similarly, sometimes "insulating film" can be replaced with "insulating layer".

[0056] In this disclosure, "about" or "approximately" means values ​​that are not strictly defined and are within the allowable range of process and measurement errors.

[0057] In this disclosure, triangles, rectangles, trapezoids, pentagons, or hexagons are not strictly defined, but can be approximate triangles, rectangles, trapezoids, pentagons, or hexagons. Small deformations due to tolerances are possible, and chamfers, curved edges, and other deformations are possible.

[0058] Currently, white light-emitting devices are generally used to achieve full-color OLED microdisplays. There are two common structures for achieving full-color microdisplays: one is a weak microcavity structure. In a weak microcavity structure, the white light emitted by the white light-emitting device has a wide spectrum. Even after filtering by a filter, the spectrum of each sub-pixel remains wide, and the color gamut of the light-emitting device is low. Furthermore, the luminous efficiency of a weak microcavity structure is low. The other is a strong microcavity structure, where the cavity lengths of different sub-pixels are unequal. Using a strong microcavity structure can improve luminous efficiency. Currently, a strong microcavity structure can be achieved by setting an adjustment layer.

[0059] This disclosure provides a display substrate including a plurality of sub-pixels, wherein the plurality of sub-pixels includes at least a first sub-pixel, a second sub-pixel, and a third sub-pixel; the first sub-pixel is configured to emit blue light, the second sub-pixel is configured to emit red light, and the third sub-pixel is configured to emit green light;

[0060] The display substrate includes a back plate, a reflective layer on the back plate, and a light-emitting functional layer on the side of the reflective layer away from the back plate; the light-emitting functional layer includes at least a first light-emitting functional layer, a second light-emitting functional layer, and a third light-emitting functional layer, wherein the first light-emitting functional layer includes a first light-emitting layer configured to emit blue light under the action of an electric field, the second light-emitting functional layer includes a second light-emitting layer configured to emit red light under the action of an electric field, and the third light-emitting functional layer includes a third light-emitting layer configured to emit green light under the action of an electric field;

[0061] The first sub-pixel includes a first light-emitting functional layer and has a first distance, which refers to the maximum distance between the first light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate; the second sub-pixel includes a second light-emitting functional layer and has a second distance, which refers to the minimum distance between the second light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate; the third sub-pixel includes a third light-emitting functional layer and has a third distance, which refers to the maximum distance between the third light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate.

[0062] Among the first distance, the second distance, and the third distance, the second distance is the largest.

[0063] The display substrate provided in this embodiment can form a strong microcavity structure with the first sub-pixel, the second sub-pixel, and the third sub-pixel. By limiting the second distance of the second sub-pixel that emits red light to the maximum, the energy loss at the interface of the reflective layer can be reduced, and the luminous efficiency of the display substrate can be improved.

[0064] Figure 1 is a schematic diagram of a display device according to an embodiment of the present disclosure. As shown in Figure 1, the OLED display device may include a timing controller, a data driver, a scan driver, and a pixel array. The timing controller is connected to the data driver and the scan driver, respectively. The data driver is connected to multiple data signal lines (D1 to Dn), and the scan driver is connected to multiple scan signal lines (S1 to Sm). The pixel array may include multiple sub-pixels Pxij, each sub-pixel Pxij can be connected to a corresponding data signal line and a corresponding scan signal line, where i and j can be natural numbers. At least one sub-pixel Pxij may include at least a circuit unit and a display unit. The circuit unit may include at least a pixel driving circuit, which is connected to the scan signal line and the data signal line, respectively. The display unit may include at least a light-emitting device, which is connected to the pixel driving circuit of the circuit unit. The sub-pixel Pxij may refer to a sub-pixel whose pixel driving circuit is connected to the i-th scan signal line and connected to the j-th data signal line. In an exemplary embodiment, the timing controller can provide grayscale values ​​and control signals of specifications suitable for the data driver to the data driver, and can provide clock signals, scan start signals, etc., of specifications suitable for the scan driver to the scan driver. The data driver can use the grayscale values ​​and control signals received from the timing controller to generate data voltages to be provided to data signal lines D1, D2, D3, ..., Dn. For example, the data driver can sample grayscale values ​​using a clock signal and apply data voltages corresponding to the grayscale values ​​to data signal lines D1 to Dn in units of pixel columns, where n can be a natural number. The scan driver can generate scan signals to be provided to scan signal lines S1, S2, S3, ..., Sm by receiving clock signals, scan start signals, etc., from the timing controller. For example, the scan driver can sequentially provide scan signals with on-level pulses to scan signal lines S1 to Sm. For example, the scan driver can be configured as a shift register and can generate scan signals by sequentially transmitting scan start signals provided in the form of on-level pulses to the next stage circuit under the control of a clock signal, where m can be a natural number. In an exemplary embodiment, the pixel array may be disposed on a display substrate.

[0065] Figure 2 is a schematic planar structure diagram of a display device according to an embodiment of the present disclosure. As shown in Figure 2, the display device may include a plurality of pixel units P arranged in a matrix. At least one pixel unit P may include a plurality of sub-pixels. The plurality of sub-pixels may include at least a first sub-pixel P1 emitting a first color light, a second sub-pixel P2 emitting a second color light, and a third sub-pixel P3 emitting a third color light. Each of the three sub-pixels may include a pixel driving circuit and a light-emitting device. The pixel driving circuit in the sub-pixel is connected to a scan signal line and a data signal line, respectively. The pixel driving circuit is configured to receive the data voltage transmitted by the data signal line under the control of the scan signal line and output a corresponding current to the light-emitting device. The light-emitting device in the sub-pixel is connected to the pixel driving circuit of the sub-pixel, and the light-emitting device is configured to emit light of a corresponding brightness in response to the current output by the pixel driving circuit of the sub-pixel.

[0066] In an exemplary embodiment, the first sub-pixel P1 may be a blue sub-pixel emitting blue (B) light. The second sub-pixel P2 may be a red sub-pixel emitting red (R) light, and the third sub-pixel P3 may be a green sub-pixel emitting green (G) light. In embodiments of this disclosure, blue may also be referred to as the first color, red as the second color, and green as the third color. In exemplary embodiments, the shape of the sub-pixels may be any one of triangles, rectangles, rhombuses, trapezoids, parallelograms, pentagons, hexagons, etc., and multiple sub-pixels may be arranged in a horizontal parallel, vertical parallel, square, or diamond shape, etc., without limitation herein.

[0067] Figure 3 is a cross-sectional schematic diagram of a display device according to an embodiment of the present disclosure. As shown in Figure 3, taking only one pixel unit as an example, the display device may include a display substrate and an optical coupling layer 103, an encapsulation layer 104, and a color filter structure layer 105 sequentially disposed on one side of the display substrate. The display substrate may include a back plate 101 and a light-emitting structure layer 102 disposed on the back plate 101. In some possible implementations, the display device may also include other film layers, such as a cover layer, etc. The cover layer may be made of glass, or of a flexible plastic such as colorless polyimide, etc., which are not limited herein.

[0068] In an exemplary embodiment, the backplane 101 may include a substrate and a driving circuit layer stacked together. The substrate may be a silicon-on-insulator (SOI) substrate. The driving circuit layer may be fabricated on the substrate using silicon semiconductor processes (e.g., CMOS processes). The driving circuit layer may include multiple circuit units, each of which may include at least a pixel driving circuit. The pixel driving circuit is connected to scan signal lines and data signal lines, respectively. The pixel driving circuit may include multiple transistors and storage capacitors. The transistors may include a gate electrode, a first electrode, and a second electrode. The gate electrode, the first electrode, and the second electrode may be connected to corresponding electrical structures (e.g., traces) via tungsten-filled vias (i.e., tungsten vias, W-vias), respectively.

[0069] In an exemplary embodiment, the light-emitting structural layer 102 may include a light-emitting functional layer, which may include at least a first light-emitting functional layer 11, a second light-emitting functional layer 12, and a third light-emitting functional layer 13. The first sub-pixel P1 includes the first light-emitting functional layer 11, the second sub-pixel P2 includes the second light-emitting functional layer 12, and the third sub-pixel P3 includes the third light-emitting functional layer 13. For example, the light-emitting functional layers of all sub-pixels may be a common layer connected together, which simplifies the structure of the light-emitting functional layer. During the fabrication process, multiple light-emitting functional layers of multiple sub-pixels can be formed simultaneously, meaning that multiple light-emitting functional layers of multiple sub-pixels are of the same layer structure and do not need to be fabricated separately. This simplifies the fabrication process of the display substrate and reduces fabrication costs.

[0070] In an exemplary embodiment, the material of the optical coupling layer 103 may include inorganic or organic materials, and the optical coupling layer 103 can achieve coupling of different light rays.

[0071] In an exemplary embodiment, the encapsulation layer 104 may employ thin film encapsulation (TFE) to prevent external moisture from entering the light-emitting structure layer. For example, the encapsulation layer may include a first encapsulation layer, a second encapsulation layer, and a third encapsulation layer. The first and third encapsulation layers may be made of inorganic materials, while the second encapsulation layer may be made of organic materials, forming an inorganic / organic / inorganic material stacked structure to ensure that external moisture cannot enter the light-emitting structure layer.

[0072] In an exemplary embodiment, the color filter structure layer 105 may include a black matrix (BM) and a color filter (CF). The color filter may include a red light filter, a green light filter, and a blue light filter. The red light filter, green light filter, and blue light filter are respectively disposed in the red sub-pixel, green sub-pixel, and blue sub-pixel. The color filter can improve the color purity of red (R) light, green (G) light, and blue (B) light. The black matrix may be located between adjacent color filters.

[0073] In an exemplary embodiment, the orthographic projection of the blue light filter onto the plane of the back plate 101 at least partially overlaps with the orthographic projection of the first light-emitting functional layer 11 onto the plane of the back plate 101. For example, the orthographic projection of the blue light filter onto the plane of the back plate 101 includes the orthographic projection of the first light-emitting functional layer 11 onto the plane of the back plate 101. The orthographic projection of the red light filter onto the plane of the back plate 101 at least partially overlaps with the orthographic projection of the second light-emitting functional layer 12 onto the plane of the back plate 101. For example, the orthographic projection of the red light filter onto the plane of the back plate 101 includes the orthographic projection of the second light-emitting functional layer 12 onto the plane of the back plate 101. The orthographic projection of the green light filter onto the plane of the back plate 101 at least partially overlaps with the orthographic projection of the third light-emitting functional layer 13 onto the plane of the back plate 101. For example, the orthographic projection of the green light filter onto the plane of the back plate 101 includes the orthographic projection of the third light-emitting functional layer 13 onto the plane of the back plate 101.

[0074] Figure 4A is a schematic diagram of the film layer structure of a display substrate according to an embodiment of the present disclosure, and Figure 4B is a schematic diagram of the film layer structure of a display substrate according to an embodiment of the present disclosure. As shown in Figures 4A and 4B, the figures only illustrate the film layer structure of one pixel unit as an example. The display substrate may include a back plate 101 and a light-emitting structure layer 102 disposed on the back plate 101. The light-emitting structure layer 102 may include a first electrode layer 201, a reflective layer 202, a light-adjusting layer 203, a planarization layer 204, a light-emitting functional layer, and a second electrode layer 213. The light-emitting functional layer may include a first light-emitting layer 206 (EML1), a second light-emitting layer 211 (EML2), and a third light-emitting layer 210 (EML3) stacked together. For example, the first light-emitting layer 206 (EML1), the third light-emitting layer 210 (EML3), and the second light-emitting layer 211 (EML2) may be stacked sequentially in the direction away from the back plate 101. The arrangement order of the first light-emitting layer 206, the second light-emitting layer 211, and the third light-emitting layer 210 can be adaptively adjusted while meeting the requirements of the first distance, the second distance, and the third distance. The light-emitting functional layer may also include any one of a hole transport layer, a charge generation layer, and an electron transport layer. For example, the light-emitting functional layer may include a first hole transport layer 205 (HTL1), a first light-emitting layer 206 (EML1), a first electron transport layer 207 (ETL1), a charge generation layer 208 (CGL), a second hole transport layer 209 (HTL2), a third light-emitting layer 210 (EML3), a second light-emitting layer 211 (EML2), and a second electron transport layer 212 (ETL2) stacked together. The first light-emitting layer 206 can emit light of a first color under the influence of an electric field, the second light-emitting layer 211 can emit light of a second color under the influence of an electric field, and the third light-emitting layer 210 can emit light of a third color under the influence of an electric field. That is, the light-emitting functional layer can emit white light under the influence of an electric field. The charge generation layer 208 can connect the first light-emitting layer 206, the second light-emitting layer 211, and the third light-emitting layer 210 in series, enabling the generation and transfer of charge carriers. In some possible embodiments, the light-emitting functional layer may also include any one or more of the following film layers: hole injection layer (HIL), electron blocking layer (EBL), hole blocking layer (HBL), and electron injection layer (EIL).

[0075] In an exemplary embodiment, as shown in Figures 4A and 4B, the first electrode layer 201 may include multiple electrodes, at least including a first electrode 201-1, a second electrode 201-2, and a third electrode 201-3. The second electrode layer 213 may include multiple electrodes, at least including a fourth electrode 213-4, a fifth electrode 213-5, and a sixth electrode 213-6. The fourth electrode 213-4, the fifth electrode 213-5, and the sixth electrode 213-6 may be an integrally connected structure.

[0076] The first sub-pixel P1 may include a first light-emitting device, which may include a first electrode 201-1, a first light-emitting functional layer 11, and a fourth electrode 213-4. The first electrode may also be referred to as the anode of the first light-emitting device, and the fourth electrode may also be referred to as the cathode of the first light-emitting device. The second sub-pixel P2 may include a second light-emitting device, which may include a second electrode 201-2, a second light-emitting functional layer 12, and a fifth electrode 213-5. The second electrode may also be referred to as the anode of the second light-emitting device, and the fifth electrode may also be referred to as the cathode of the second light-emitting device. The third sub-pixel P3 may include a third light-emitting device, which may include a third electrode 201-3, a third light-emitting functional layer 13, and a sixth electrode 213-6. The third electrode may also be referred to as the anode of the third light-emitting device, and the sixth electrode may also be referred to as the cathode of the third light-emitting device. In this embodiment, the first, second, and third light-emitting devices may all emit white light. For example, the first light-emitting functional layer 11, the second light-emitting functional layer 12, and the third light-emitting functional layer 13 may each include a first hole transport layer 205 (HTL1), a first light-emitting layer 206 (EML1), a first electron transport layer 207 (ETL1), a charge generation layer 208 (CGL), a second hole transport layer 209 (HTL2), a third light-emitting layer 210 (EML3), a second light-emitting layer 211 (EML2), and a second electron transport layer 212 (ETL2) stacked sequentially.

[0077] In an exemplary embodiment, as shown in FIG4A, the reflective layer 202 may include a plurality of reflective electrodes, which may include at least a first reflective electrode 202-1, a second reflective electrode 202-2, and a third reflective electrode 202-3. The first reflective electrode 202-1 is used to generate a micro-resonant cavity effect in the light emitted by the first light-emitting device, the second reflective electrode 202-2 is used to generate a micro-resonant cavity effect in the light emitted by the second light-emitting device, and the third reflective electrode 202-3 is used to generate a micro-resonant cavity effect in the light emitted by the third light-emitting device.

[0078] In an exemplary embodiment, as shown in FIG4A, the light adjustment layer 203 may include a plurality of adjustment portions, which may include at least a first adjustment portion 203-1, a second adjustment portion 203-2, and a third adjustment portion 203-3. For example, the thicknesses of the first adjustment portion 203-1, the second adjustment portion 203-2, and the third adjustment portion 203-3 may all be different. In this embodiment, the direction of the thickness is perpendicular to the plane of the display substrate. The first adjustment portion 203-1 has a first thickness h1, the second adjustment portion 203-2 has a second thickness h2, and the third adjustment portion 203-3 has a third thickness h3, where h1 may be greater than h2, and h2 may be greater than h3. In this embodiment, by providing adjustment portions with different thicknesses, the microcavity structures formed by the three sub-pixels can have different microcavity lengths.

[0079] In this embodiment, the first sub-pixel P1 may have a first distance, which refers to the maximum distance between the first light-emitting layer and the reflective layer along a direction perpendicular to the plane of the backplate. The second sub-pixel P2 may have a second distance, which refers to the minimum distance between the second light-emitting layer and the reflective layer along a direction perpendicular to the plane of the backplate. The third sub-pixel P3 may have a third distance, which refers to the maximum distance between the third light-emitting layer and the reflective layer along a direction perpendicular to the plane of the backplate. Among the first, second, and third distances, the second distance is the largest, which can reduce energy loss at the reflective layer interface and improve the luminous efficiency of the light-emitting device. In an exemplary embodiment, the thickness of the first adjustment part 203-1, the second adjustment part 203-2, and the third adjustment part 203-3 can be adjusted so that the second distance is the largest among the first, second, and third distances.

[0080] In an exemplary embodiment, the first distance can range from 110 nanometers to 220 nanometers. The second distance can range from 180 nanometers to 290 nanometers. The third distance can range from 150 nanometers to 260 nanometers, which allows the sub-pixels to have a narrower spectrum and a wider color gamut. The display substrate provided in this disclosure embodiment can utilize a strong microcavity effect to enhance light near the resonant wavelength corresponding to the microcavity length in the light emitted by each sub-pixel, while attenuating light of other wavelengths not corresponding to the resonant wavelength.

[0081] In an exemplary embodiment, the material of the light-modulating layer 203 may include a transparent conductive material. For example, the transparent conductive material may include a transparent conductive oxide material, such as indium tin oxide (ITO) or indium zinc oxide (IZO). For example, the light-modulating layer may be a single-layer structure or a multi-layer composite structure, such as ITO / Al / ITO. In an exemplary embodiment, the first modulating portion 203-1 has a first thickness h1, which can range from 80 nm to 90 nm, for example, 85 nm, and a first distance of 145 nm. The second modulating portion 203-2 has a second thickness h2, which can range from 55 nm to 65 nm, for example, 60 nm, and a second distance of 209 nm. The third modulating portion 203-3 has a third thickness h3, which can range from 20 nm to 30 nm, for example, 25 nm, and a third distance of 184 nm. In an exemplary embodiment, the light conditioning layer may be a single film layer or may include two or more film layers. For example, the light conditioning layer may include two film layers, or may include three film layers, or may include four film layers, etc.

[0082] In an exemplary embodiment, in a structure in which at least one of the first adjustment portion, the second adjustment portion, and the third adjustment portion includes two or more film layers, some film layers of the first adjustment portion, the second adjustment portion, and the third adjustment portion can be fabricated using the same patterning process, which can simplify the overall film layer structure of the display substrate, reduce the number of fabrication steps, and lower the fabrication cost of the display substrate.

[0083] In an exemplary embodiment, at least a portion of the film layers of at least two of the first adjustment portion, the second adjustment portion, and the third adjustment portion are of the same layer structure, which reduces the number of manufacturing steps and can reduce the manufacturing cost of the display substrate.

[0084] Figure 5 is a cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure. As shown in Figure 5, only one pixel unit is illustrated as an example. As shown in Figure 5, the light-emitting structure layer 102 may further include a pixel definition layer 214, which may include multiple partitions. The structures of the multiple partitions may be the same or different. In the embodiment of the present disclosure, by setting the partitions, the light-emitting functional layer can be broken at the partitions, so that the light-emitting functional layer is divided into a first light-emitting functional layer, a second light-emitting functional layer, and a third light-emitting functional layer that are independent of each other. This can avoid mutual interference between the light-emitting functional layers of adjacent sub-pixels and improve the reliability of the display.

[0085] As shown in Figure 5, taking one of the partition structures as an example, the partition may include multiple sub-film layers, which may include a first sub-film layer 214-1, a second sub-film layer 214-2, and a third sub-film layer 214-3 arranged sequentially in the direction away from the reflective layer 202. The orthographic projection of the second sub-film layer 214-2 onto the plane of the display substrate can be located within the orthographic projection of the first sub-film layer 214-1 onto the plane of the display substrate. The orthographic projection area of ​​the second sub-film layer 214-2 onto the plane of the display substrate is smaller than the orthographic projection area of ​​the first sub-film layer 214-1 onto the plane of the display substrate. The orthographic projection of the third sub-film layer 214-3 onto the plane of the display substrate includes the orthographic projection of the second sub-film layer 214-2 onto the plane of the display substrate. The orthographic projection area of ​​the third sub-film layer 214-3 onto the plane of the display substrate is larger than the orthographic projection area of ​​the second sub-film layer 214-2 onto the plane of the display substrate. The orthographic projection of the third sub-film layer 214-3 onto the plane of the display substrate is located within the orthographic projection of the first sub-film layer 214-1 onto the plane of the display substrate. The multiple sub-film layers of the partition can form an undercut structure. The undercut structure is beneficial for the light-emitting functional layer to be disconnected at the partition. The partition with the undercut structure can avoid the problem of cathode puncture or breakage caused by deformation of its edge.

[0086] In an exemplary embodiment, the materials of the first sub-film layer 214-1 and the third sub-film layer 214-3 may include silicon oxide (SiO2). x For example, the silicon oxide can be silicon oxide. The material of the second sub-film layer 214-2 can include silicon nitride (SiN). x For example, the silicon nitride can be silicon nitride. In embodiments of this disclosure, designing the material of the second sub-film layer to be a different material from the materials of the first and third sub-film layers facilitates the formation of an undercut structure.

[0087] In an exemplary embodiment, as shown in FIG5, the pixel definition layer 214 may have multiple pixel openings, which may include at least a first opening 214a, a second opening 214b, and a third opening 214c. A first sub-pixel P1 may emit light of a first color through the first opening 214a, a second sub-pixel P2 may emit light of a second color through the second opening 214b, and a third sub-pixel P3 may emit light of a third color through the third opening 214c. The shape of the orthographic projection of the pixel opening onto the plane of the display substrate may be rectangular, circular, pentagonal, or hexagonal, etc.

[0088] In an exemplary embodiment, as shown in FIG5, the pixel definition layer 214 may further have a plurality of partition slots 214d, which are located between two adjacent pixel openings. For example, partition slot 214d is located between a first opening 214a and a second opening 214b; alternatively, partition slot 214d is located between a second opening 214b and a third opening 214c. The partition slots 214d can separate two adjacent light-emitting functional layers, thus preventing mutual interference between the light-emitting functional layers of adjacent sub-pixels. In this embodiment, the partition slot can be a hole.

[0089] The wall of the partition groove 214d may include a first segment and a second segment connected to each other. The first segment is farther from the back plate 101 than the second segment. The first segment has a first aperture d1, and the second segment has a second aperture d2, with the first aperture d1 being smaller than the second aperture d2. This allows the first and second segments to form a stepped shape, which is beneficial for disconnecting the light-emitting functional layer at this point. In a structure where the aperture of the first segment is not a single value, the first aperture is the maximum aperture of the first segment. In a structure where the aperture of the second segment is not a single value, the second aperture is the minimum aperture of the second segment. In embodiments of this disclosure, aperture refers to the radial dimension of the hole.

[0090] In one exemplary embodiment, multiple partitions may together enclose a partition groove.

[0091] In one exemplary embodiment, the material of the light-modulating layer 203 may include a non-conductive transparent material, for example, an inorganic or organic material. Inorganic materials include, for example, silicon oxynitride (SiO2). x N y ) or silicon nitride (SiN) x ) or silicon oxide (SiO) x Any one or more of the following: organic materials, such as epoxy resin, phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, furan resin, silicone resin, polyester resin, polyamide resin, acrylic resin, polyurethane, vinyl resin, hydrocarbon resin, polyether resin, etc.

[0092] In an exemplary embodiment, the first adjustment unit 203-1 has a first thickness h1, which can range from 95 nanometers to 105 nanometers, for example, 100 nanometers, and a first distance of 185 nanometers. The second adjustment unit 203-2 has a second thickness h2, which can range from 50 nanometers to 60 nanometers, for example, 55 nanometers, and a second distance of 229 nanometers. The third adjustment unit 203-3 has a third thickness h3, which can range from 0 nanometers to 10 nanometers, for example, 0 nanometers, and a third distance of 185 nanometers.

[0093] In an exemplary embodiment, the light-emitting structure layer 102 may further include a connecting electrode layer 215, a portion of which may be located between the light-adjusting layer 203 and the pixel definition layer 214. The connecting electrode layer 215 may include multiple connecting electrodes, at least including a first connecting electrode 215-1, a second connecting electrode 215-2, and a third connecting electrode 215-3. A first opening 214a exposes at least a portion of the first connecting electrode 215-1, and at least a portion of the first light-emitting functional layer may be located within the first opening 214a and connected to the first connecting electrode 215-1. The first connecting electrode 215-1 is connected to the first reflective electrode 202-1 via a first via K1, thus realizing the connection between the first light-emitting functional layer and the first electrode 201-1. The first light-emitting functional layer can emit white light under the action of the electric field formed by the first electrode 201-1 and the fourth electrode 213-4. The orthographic projection of the first opening 214a onto the plane of the display substrate can be located within the orthographic projection of the first connecting electrode 215-1 onto the plane of the display substrate, which can improve the luminous efficiency of the first light-emitting functional layer. The orthographic projection of the first via K1 onto the plane of the display substrate can be located within the orthographic projection of the first reflective electrode 202-1 onto the plane of the display substrate, and the orthographic projection of the first via K1 onto the plane of the display substrate does not overlap with the orthographic projection of the first opening 214a onto the plane of the display substrate. This can avoid the adverse effects of setting the first via on the luminous performance of the first sub-pixel, prevent light leakage from the edge of the first via, and improve the light extraction efficiency of the first sub-pixel.

[0094] In one exemplary embodiment, the second opening 214b exposes at least a portion of the second connecting electrode 215-2. At least a portion of the second light-emitting functional layer can be located within the second opening 214b and connected to the second connecting electrode 215-2. The second connecting electrode 215-2 is connected to the second reflective electrode 202-2 via the second via K2, thus realizing the connection between the second light-emitting functional layer and the second electrode 201-2. The second light-emitting functional layer can emit white light under the action of the electric field formed by the second electrode 201-2 and the fifth electrode 213-5. The orthographic projection of the second opening 214b onto the plane of the display substrate can be located within the orthographic projection of the second connecting electrode 215-2 onto the plane of the display substrate, which can improve the luminous efficiency of the second light-emitting functional layer. The orthographic projection of the second via K2 onto the plane of the display substrate can be located within the orthographic projection of the second reflective electrode 202-2 onto the plane of the display substrate. Furthermore, the orthographic projection of the second via K2 onto the plane of the display substrate does not overlap with the orthographic projection of the second opening 214b onto the plane of the display substrate. This avoids the adverse effects of setting the second via on the light-emitting performance of the second sub-pixel, prevents light leakage from the edge of the second via, and improves the light-emitting efficiency of the second sub-pixel.

[0095] In an exemplary embodiment, the third opening 214c exposes at least a portion of the third connecting electrode 215-3. At least a portion of the third light-emitting functional layer can be located within the third opening 214c and connected to the third connecting electrode 215-3. The third connecting electrode 215-3 is connected to the third reflecting electrode 202-3 via the third via K3, thus realizing the connection between the third light-emitting functional layer and the third electrode 201-3. The third light-emitting functional layer can emit white light under the action of the electric field formed by the third electrode 201-3 and the sixth electrode 213-6. The orthographic projection of the third opening 214c onto the plane of the display substrate can be located within the orthographic projection of the third connecting electrode 215-3 onto the plane of the display substrate, which can improve the luminous efficiency of the third light-emitting functional layer. The orthographic projection of the third via K3 onto the plane of the display substrate can be located within the orthographic projection of the third reflecting electrode 202-3 onto the plane of the display substrate, and the orthographic projection of the third opening 214c onto the plane of the display substrate can be located within the orthographic projection of the third via K3 onto the plane of the display substrate. Since the third thickness of the third adjustment part is zero, the orthographic projection of the third opening on the plane where the display substrate is located is set to be within the orthographic projection of the third via on the plane where the display substrate is located. This allows the third via to be shared with the via of the third adjustment part with zero thickness on the light adjustment layer. This reduces the number of vias on the display substrate, increases pixel density, and reduces the probability of light leakage at the via.

[0096] In an exemplary embodiment, the orthographic projection of the light-adjusting layer onto the plane of the back panel does not overlap with the orthographic projection of the third light-emitting functional layer onto the plane of the back panel.

[0097] In an exemplary embodiment, the material of the connecting electrode layer 215 may include a transparent conductive material. For example, the transparent conductive material may include a transparent conductive oxide material, such as indium tin oxide (ITO) or indium zinc oxide (IZO). For example, the connecting electrode layer may be a single-layer structure or a multi-layer composite structure.

[0098] In some possible embodiments, there is no need to set up a separate planarization layer; the light conditioning layer can serve as a planarization layer.

[0099] In some possible embodiments, the connecting electrode layer 215 may include multiple connecting electrodes, which may include at least a first connecting electrode 215-1 and a second connecting electrode 215-2. There is no need to provide a third connecting electrode, and the third light-emitting functional layer can directly contact the third reflective electrode.

[0100] Figure 6 is a cross-sectional schematic diagram of a display substrate according to another embodiment of the present disclosure. As shown in Figure 6, only one pixel unit is illustrated as an example. The structure of the display substrate in this embodiment is basically the same as that of the display substrate in the previous embodiment, the main difference being that at least one of the first adjustment part 203-1, the second adjustment part 203-2, and the third adjustment part 203-3 is a two- or more film layer structure. For example, the first adjustment part 203-1 can be a two- or more film layer structure, and the second adjustment part 203-2 and the third adjustment part 203-3 are both single film layer structures. Alternatively, the first adjustment part 203-1 and the second adjustment part 203-2 are both two- or more film layer structures, and the third adjustment part 203-3 is a single film layer structure. In Figure 6, the example is that the first adjustment part 203-1 is a two-film layer structure, the second adjustment part 203-2 is a single film layer structure, and the thickness of the third adjustment part 203-3 is zero.

[0101] The first adjustment portion 203-1 may include a first sub-adjustment portion 203a and a second sub-adjustment portion 203b stacked together, with the first sub-adjustment portion 203a closer to the backplate 101 than the second sub-adjustment portion 203b. The thickness of the first sub-adjustment portion 203a and the second thickness of the second adjustment portion 203-2 may be equal. During the manufacturing process, the first sub-adjustment portion and the second adjustment portion can be fabricated using the same patterning process, which simplifies the manufacturing process and reduces the manufacturing cost of the display substrate.

[0102] In one exemplary embodiment, the surface of the second adjustment part 203-2 away from the back plate 101 is flush with the surface of the first sub-adjustment part 203a away from the back plate 101.

[0103] In an exemplary embodiment, the first adjustment unit 203-1 has a first thickness h1, which can range from 85 nanometers to 95 nanometers, for example, 90 nanometers, and a first distance of 175 nanometers. For example, the first sub-adjustment unit 203a has a thickness of 55 nanometers, and the second sub-adjustment unit has a thickness of 35 nanometers. The second adjustment unit 203-2 has a second thickness h2, which can range from 50 nanometers to 60 nanometers, for example, 55 nanometers, and a second distance of 229 nanometers. The third adjustment unit 203-3 has a third thickness h3, which can range from 0 nanometers to 10 nanometers, for example, 0 nanometers, and a third distance of 185 nanometers.

[0104] In some possible exemplary embodiments, the first thickness h1 and the second thickness h2 can be equal. A strong microcavity effect can be achieved by adjusting the structure or film thickness of the first and second light-emitting functional layers, that is, satisfying the condition that the second distance is the largest among the first, second, and third distances. This design simplifies the structure of the light-modulating layer and the fabrication process of the light-modulating layer.

[0105] The structure of a display substrate is illustrated below using an example of the fabrication process. The "patterning process" described in this disclosure, for metallic, inorganic, or transparent conductive materials, includes processes such as photoresist coating, mask exposure, development, etching, and photoresist stripping; for organic materials, it includes processes such as organic material coating, mask exposure, and development. The deposition process can employ any one or more of sputtering, evaporation, and chemical vapor deposition; the coating process can employ any one or more of spraying, spin coating, and inkjet printing; and the etching process can employ any one or more of dry etching and wet etching. This disclosure does not limit the specific processes. A "thin film" refers to a thin film of a certain material fabricated on a substrate using deposition, coating, or other processes. If the "thin film" does not require a patterning process during the entire fabrication process, it can also be called a "layer." If the "thin film" requires a patterning process during the entire fabrication process, it is called a "thin film" before the patterning process and a "layer" after the patterning process. The "layer" after the patterning process contains at least one "pattern." The "A and B co-layer structure" described in this disclosure refers to A and B being formed through the same patterning process.

[0106] Taking a single pixel unit as an example, the fabrication process of the display substrate may include the following steps:

[0107] (01) Forming a first electrode layer pattern. Forming the first electrode layer pattern may include: depositing a first conductive film on one side of the backplate 101, and patterning the first conductive film through a patterning process, so that the first conductive film forms a first electrode layer pattern on the backplate 101, as shown in FIG7A. The first electrode layer pattern may include multiple electrodes, and the multiple electrodes may include at least a first electrode 201-1, a second electrode 201-2, and a third electrode 201-3.

[0108] In an exemplary embodiment, the material of the first conductive film can be a metallic material, such as any one or more of molybdenum (Mo), aluminum (Al), copper (Cu), and titanium (Ti). Alternatively, it can be an alloy of molybdenum (Mo), aluminum (Al), copper (Cu), and titanium (Ti), such as aluminum-neodymium alloy (AlNd), molybdenum-niobium alloy (MoNb), or molybdenum-nickel-titanium alloy (MoNiTi). The first conductive film can be a single-layer structure or a multi-layer composite structure, such as Ti / Al / Ti, Mo / Nb / Cu, MoNiTi / Cu, MoNb / Cu / MoNiTi, or MoNiTi / Cu / MoNiTi, etc. In Figure 7A, a three-layer composite structure of the first conductive film is used as an example.

[0109] (02) Forming a reflective layer pattern. Forming a reflective layer pattern may include: depositing a second conductive film on one side of the backplate 101, and patterning the second conductive film through a patterning process, so that the second conductive film forms a reflective layer pattern on the side of the first electrode layer 201 away from the backplate 101, as shown in FIG7B. The reflective layer pattern may include multiple reflective electrodes, and the multiple reflective electrodes may include at least a first reflective electrode 202-1, a second reflective electrode 202-2, and a third reflective electrode 202-3.

[0110] Multiple reflective electrodes are grouped together with multiple electrodes located on the first electrode layer 201. The orthographic projection of the first reflective electrode 202-1 on the plane of the back plate 101 at least partially overlaps with the orthographic projection of the first electrode 201-1 on the plane of the back plate 101. For example, the orthographic projection of the first reflective electrode 202-1 on the plane of the back plate 101 includes the orthographic projection of the first electrode 201-1 on the plane of the back plate 101, and the orthographic projection area of ​​the first reflective electrode 202-1 on the plane of the back plate 101 is greater than the orthographic projection area of ​​the first electrode 201-1 on the plane of the back plate 101. The orthographic projection of the second reflective electrode 202-2 onto the plane of the back plate 101 at least partially overlaps with the orthographic projection of the second electrode 201-2 onto the plane of the back plate 101. For example, the orthographic projection of the second reflective electrode 202-2 onto the plane of the back plate 101 includes the orthographic projection of the second electrode 201-2 onto the plane of the back plate 101, and the area of ​​the orthographic projection of the second reflective electrode 202-2 onto the plane of the back plate 101 is greater than the area of ​​the orthographic projection of the second electrode 201-2 onto the plane of the back plate 101. The orthographic projection of the third reflective electrode 202-3 onto the plane of the back plate 101 at least partially overlaps with the orthographic projection of the third electrode 201-3 onto the plane of the back plate 101. For example, the orthographic projection of the third reflective electrode 202-3 onto the plane of the back plate 101 includes the orthographic projection of the third electrode 201-3 onto the plane of the back plate 101, and the area of ​​the orthographic projection of the third reflective electrode 202-3 onto the plane of the back plate 101 is greater than the area of ​​the orthographic projection of the third electrode 201-3 onto the plane of the back plate 101.

[0111] In an exemplary embodiment, the material of the second conductive film can be a metallic material, such as any one or more of molybdenum (Mo), aluminum (Al), copper (Cu), and titanium (Ti). Alternatively, it can be an alloy of molybdenum (Mo), aluminum (Al), copper (Cu), and titanium (Ti), such as aluminum-neodymium alloy (AlNd), molybdenum-niobium alloy (MoNb), or molybdenum-nickel-titanium alloy (MoNiTi). The second conductive film can be a single-layer structure or a multi-layer composite structure, such as Ti / Al / Ti, Mo / Nb / Cu, MoNiTi / Cu, MoNb / Cu / MoNiTi, or MoNiTi / Cu / MoNiTi, etc. In Figure 7B, a single-layer structure is used as an example of the second conductive film. In some examples, the structure and material of the second conductive film can be the same as those of the first conductive film.

[0112] (03) Forming a planarization layer pattern. Forming a planarization layer pattern may include: sequentially depositing a first dielectric film 21 and a second dielectric film 22 on one side of the backplate 101, and patterning the second dielectric film 22 and the first dielectric film 21 through a patterning process, so that the first dielectric film 21 and the second dielectric film 22 form an illumination adjustment layer pattern and a planarization layer pattern, as shown in FIG7C. The surface of the illumination adjustment layer pattern away from the backplate 101 is substantially flush with the surface of the planarization layer pattern away from the backplate 101.

[0113] The light-adjusting layer pattern may include a first adjusting portion 203-1, a second adjusting portion 203-2, and a third adjusting portion. In FIG. 7C, the thickness of the third adjusting portion is zero, so it is not shown. A portion of the first dielectric film becomes the second adjusting portion 203-2. A portion of the first dielectric film becomes the first sub-adjusting portion 203a, a portion of the second dielectric film becomes the second sub-adjusting portion 203b, and a portion of the second dielectric film becomes the planarization layer 204. The surface of the first sub-adjusting portion 203a away from the backplate 101 may be flush with the surface of the second adjusting portion 203-2 away from the backplate 101.

[0114] The surface of the second sub-adjustment section 203b away from the back plate 101 can be flush with the surface of the planarization layer 204 away from the back plate 101, which can avoid the adverse effects of film layer step difference on subsequent film layers and improve the reliability of the display substrate.

[0115] Forming a planarization layer pattern may include forming multiple vias, which may include at least a first via K1, a second via K2, and a third via K3. Both the first and second dielectric films located within the first via K1 are etched away, exposing a portion of the first reflective electrode 202-1. The first via K1 is configured to allow a subsequently formed first connection electrode to be connected to the first reflective electrode via this via. Both the first and second dielectric films located within the second via K2 are etched away, exposing a portion of the second reflective electrode 202-2. The second via K2 is configured to allow a subsequently formed second connection electrode to be connected to the second reflective electrode via this via. Both the first and second dielectric films located within the third via K3 are etched away, exposing a portion of the third reflective electrode 202-3. The third via K3 is configured to allow a subsequently formed third connection electrode to be connected to the third reflective electrode via this via.

[0116] The first adjustment unit 203-1 has a first thickness h1, which can range from 80 nanometers to 105 nanometers. The second adjustment unit 203-2 has a second thickness h2, which can range from 50 nanometers to 65 nanometers. The third adjustment unit has a third thickness, which can range from 0 nanometers to 30 nanometers.

[0117] In an exemplary embodiment, a half-tone mask patterning process can be used to pattern the second dielectric film and the first dielectric film.

[0118] In some possible exemplary embodiments, the first dielectric film and the second dielectric film may be patterned using a two-step patterning process.

[0119] In one exemplary embodiment, the materials of the first dielectric film and the second dielectric film may include non-conductive transparent materials, for example, inorganic or organic materials. Inorganic materials include, for example, silicon oxynitride (SiO2). x N y ) or silicon nitride (SiN) x ) or silicon oxide (SiO) x The materials can be any one or more of the following: epoxy resin, phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, furan resin, silicone resin, polyester resin, polyamide resin, acrylic resin, polyurethane, vinyl resin, hydrocarbon resin, polyether resin, etc. For example, the material of the first dielectric film can be silicon oxide, such as silicon oxide, and the material of the second dielectric film can be silicon nitride, such as silicon nitride.

[0120] (04) Forming a connection electrode layer pattern. Forming a connection electrode layer pattern may include: depositing a third conductive film on one side of the backplate 101, and patterning the third conductive film using a patterning process to form a connection electrode layer pattern, as shown in FIG7D. The connection electrode layer pattern may include multiple connection electrodes, and the multiple connection electrodes may include at least a first connection electrode 215-1, a second connection electrode 215-2, and a third connection electrode 215-3. A portion of the first connection electrode 215-1 may be located within the first via K1 and connected to the first reflective electrode 202-1. A portion of the first connection electrode 215-1 is located on the side of the second sub-adjustment portion 203b away from the backplate 101 so as to contact the subsequently formed first light-emitting functional layer in order to form an electric field that causes the first light-emitting functional layer to emit light. A portion of the second connection electrode 215-2 may be located within the second via K2 and connected to the second reflective electrode 202-2. The second connecting electrode 215-2 can be located on the side of the planarization layer 204 away from the back plate 101. The second connecting electrode 215-2 can protect a portion of the edge of the planarization layer 204, thus improving its resistance to water and oxygen. The third connecting electrode 215-3 can be located within the third via K3 and connected to the third reflective electrode 202-3. The third connecting electrode 215-3 can also be located on the side of the planarization layer 204 away from the back plate 101. The third connecting electrode 215-3 can protect a portion of the edge of the planarization layer 204, thus improving its resistance to water and oxygen.

[0121] In an exemplary embodiment, the surfaces of the first connecting electrode 215-1, the second connecting electrode 215-2, and the third connecting electrode 215-3 on the side away from the backplate 101 can be substantially flush, which can play a planarization role and help ensure the quality of the film layer formed subsequently.

[0122] (05) Forming a pixel definition layer pattern. Forming a pixel definition layer pattern may include: sequentially depositing a third dielectric film, a fourth dielectric film, and a fifth dielectric film on one side of the backplane 101, and patterning the fifth dielectric film, the fourth dielectric film, and the third dielectric film through a patterning process, so that the third dielectric film, the fourth dielectric film, and the fifth dielectric film form a pixel definition layer pattern, as shown in Figure 7E. For example, the pixel definition layer pattern may be formed using two patterning processes.

[0123] In one exemplary embodiment, the pixel definition layer pattern may have multiple pixel openings, which may include at least a first opening 214a, a second opening 214b, and a third opening 214c. A first sub-pixel may emit light of a first color through the first opening 214a, a second sub-pixel may emit light of a second color through the second opening 214b, and a third sub-pixel may emit light of a third color through the third opening 214c. The orthographic projection of the first opening 214a onto the plane of the backplate 101 may lie within the orthographic projection of the first connecting electrode 215-1 onto the plane of the backplate 101, and the third, fourth, and fifth dielectric films located within the first opening 214a are all etched away, exposing a portion of the first connecting electrode 215-1. The first opening 214a is configured to accommodate at least a portion of a subsequently formed first light-emitting functional layer. The orthographic projection of the second opening 214b onto the plane of the backplate 101 can lie within the orthographic projection of the second connecting electrode 215-2 onto the plane of the backplate 101. The third, fourth, and fifth dielectric films located within the second opening 214b are etched away, exposing a portion of the second connecting electrode 215-2. The second opening 214b is configured to accommodate at least a portion of the subsequently formed second light-emitting functional layer. The orthographic projection of the third opening 214c onto the plane of the backplate 101 can lie within the orthographic projection of the third connecting electrode 215-3 onto the plane of the backplate 101. The third, fourth, and fifth dielectric films located within the third opening 214c are etched away, exposing a portion of the third connecting electrode 215-3. The third opening 214c is configured to accommodate at least a portion of the subsequently formed third light-emitting functional layer.

[0124] In one exemplary embodiment, patterning of the third dielectric film can form multiple first sub-film layers 214-1, patterning of the fourth dielectric film can form multiple second sub-film layers 214-2, and patterning of the fifth dielectric film can form multiple third sub-film layers 214-3. The pixel definition layer 214 may include multiple partitions, each partition including multiple sub-film layers. These multiple sub-film layers may include a first sub-film layer 214-1, a second sub-film layer 214-2, and a third sub-film layer 214-3 sequentially arranged in a direction away from the reflective layer 202. Two first sub-film layers 214-1 located between two adjacent pixel openings can be an integrally connected structure.

[0125] In one exemplary embodiment, multiple partitions may be distributed around a pixel opening.

[0126] In an exemplary embodiment, the fabrication process of the display substrate may further include, after forming the pixel definition layer, sequentially forming a light-emitting functional layer, a second electrode layer, an optical coupling layer, an encapsulation layer, and a color filter structure layer.

[0127] This disclosure also provides a display device. The display device includes the display substrate described in any of the foregoing embodiments. The display device can be any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. This disclosure is not limited in this respect.

[0128] While the embodiments disclosed in this invention have been described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. It should be noted that the above embodiments or implementation methods are merely exemplary and not restrictive. Therefore, this disclosure is not limited to the content specifically shown and described herein. Various modifications, substitutions, or omissions can be made to the form and details of the implementation without departing from the scope of this disclosure.

Claims

1. A display substrate comprising a plurality of sub-pixels, the plurality of sub-pixels including at least a first sub-pixel, a second sub-pixel, and a third sub-pixel; the first sub-pixel being configured to emit blue light, the second sub-pixel being configured to emit red light, and the third sub-pixel being configured to emit green light; The display substrate includes a back plate, a reflective layer on the back plate, and a light-emitting functional layer on the side of the reflective layer away from the back plate; the light-emitting functional layer includes at least a first light-emitting functional layer, a second light-emitting functional layer, and a third light-emitting functional layer, wherein the first light-emitting functional layer includes a first light-emitting layer configured to emit blue light under the action of an electric field, the second light-emitting functional layer includes a second light-emitting layer configured to emit red light under the action of an electric field, and the third light-emitting functional layer includes a third light-emitting layer configured to emit green light under the action of an electric field; The first sub-pixel includes a first light-emitting functional layer and has a first distance, which refers to the maximum distance between the first light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate; the second sub-pixel includes a second light-emitting functional layer and has a second distance, which refers to the minimum distance between the second light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate; the third sub-pixel includes a third light-emitting functional layer and has a third distance, which refers to the maximum distance between the third light-emitting layer and the reflective layer along a direction perpendicular to the plane of the back plate. in, Of the first distance, the second distance, and the third distance, the second distance is the largest.

2. The display substrate as claimed in claim 1, wherein, The first distance ranges from 110 nanometers to 220 nanometers; the second distance ranges from 180 nanometers to 290 nanometers; and the third distance ranges from 150 nanometers to 260 nanometers.

3. The display substrate as described in claim 1, wherein, The display substrate further includes a light adjustment layer, which is located between the reflective layer and the light-emitting functional layer.

4. The display substrate as described in claim 3, wherein, The light-emitting functional layer is in contact with the light-modulating layer, and the material of the light-modulating layer is a conductive material.

5. The display substrate as claimed in claim 3, wherein, The display substrate further includes a connecting electrode layer, a portion of which is located between the light-emitting functional layer and the light-modulating layer; The material of the connecting electrode layer is a transparent conductive material, and the material of the light modulation layer is a non-conductive material.

6. The display substrate as claimed in claim 5, wherein, The connection electrode layer includes at least a first connection electrode, a second connection electrode, and a third connection electrode; the first light-emitting functional layer contacts the side of the first connection electrode away from the back plate, and the side of the first connection electrode near the back plate contacts the reflective layer; the second light-emitting functional layer contacts the side of the second connection electrode away from the back plate, and the side of the second connection electrode near the back plate contacts the reflective layer; the third light-emitting functional layer contacts the side of the third connection electrode away from the back plate, and the side of the third connection electrode near the back plate contacts the reflective layer.

7. The display substrate as claimed in claim 5, wherein, The connecting electrode layer includes at least a first connecting electrode and a second connecting electrode; the first light-emitting functional layer contacts the side of the first connecting electrode away from the back plate, and the side of the first connecting electrode near the back plate contacts the reflective layer; the second light-emitting functional layer contacts the side of the second connecting electrode away from the back plate, and the side of the second connecting electrode near the back plate contacts the reflective layer; the third light-emitting functional layer contacts the reflective layer, and the orthographic projection of the light-adjusting layer on the plane of the back plate does not overlap with the orthographic projection of the third light-emitting functional layer on the plane of the back plate.

8. The display substrate as claimed in claim 6, wherein, The display substrate further includes a pixel definition layer, which is located on the side of the light adjustment layer away from the back panel; the pixel definition layer has at least a first opening, a second opening, and a third opening; the first sub-pixel emits blue light through the first opening, the second sub-pixel emits red light through the second opening, and the third sub-pixel emits green light through the third opening; The display substrate includes at least a first via, a second via, and a third via. At least a portion of the first connecting electrode is located within the first via and in contact with the reflective layer, and the orthographic projection of the first opening onto the plane of the back panel is located within the orthographic projection of the first connecting electrode onto the plane of the back panel. At least a portion of the second connecting electrode is located within the second via and in contact with the reflective layer, and the orthographic projection of the second opening onto the plane of the back panel is located within the orthographic projection of the second connecting electrode onto the plane of the back panel. At least a portion of the third connecting electrode is located within the third via and in contact with the reflective layer, and the orthographic projection of the third opening onto the plane of the back panel is located within the orthographic projection of the third connecting electrode onto the plane of the back panel.

9. The display substrate as claimed in claim 8, wherein, The orthographic projection of the first opening onto the plane of the back panel does not overlap with the orthographic projection of the first through hole onto the plane of the back panel; the orthographic projection of the second opening onto the plane of the back panel does not overlap with the orthographic projection of the second through hole onto the plane of the back panel. The orthographic projection of the third opening onto the plane of the back panel does not overlap with the orthographic projection of the third through hole onto the plane of the back panel, or the orthographic projection of the third opening onto the plane of the back panel is located within the orthographic projection of the third through hole onto the plane of the back panel.

10. The display substrate as claimed in claim 9, wherein, The orthographic projection of the third opening onto the plane of the back panel is located within the orthographic projection of the third via onto the plane of the back panel, and the orthographic projection of the light-adjusting layer onto the plane of the back panel does not overlap with the orthographic projection of the third light-emitting functional layer onto the plane of the back panel.

11. The display substrate according to any one of claims 3 to 10, wherein, The light-modulating layer is a single film layer, or the light-modulating layer comprises two or more film layers.

12. The display substrate as claimed in claim 11, wherein, The light adjustment layer includes at least a first adjustment part, a second adjustment part, and a third adjustment part; the orthographic projection of the first adjustment part onto the plane of the back panel at least partially overlaps with the orthographic projection of the first light-emitting functional layer onto the plane of the back panel, and the orthographic projection of the second adjustment part onto the plane of the back panel at least partially overlaps with the orthographic projection of the second light-emitting functional layer onto the plane of the back panel, and the orthographic projection of the third adjustment part onto the plane of the back panel at least partially overlaps with the orthographic projection of the third light-emitting functional layer onto the plane of the back panel. Wherein, at least two of the first adjustment part, the second adjustment part and the third adjustment part have at least a portion of their film layers that are of the same layer structure.

13. The display substrate according to any one of claims 3 to 10, wherein, The first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer are of the same layer structure.

14. The display substrate as claimed in claim 13, wherein, The first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer each include the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer stacked together.

15. The display substrate as claimed in claim 14, wherein, The first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer further include at least one of a hole transport layer, an electron transport layer, and a charge generation layer.

16. The display substrate according to any one of claims 3 to 10, wherein, The display substrate further includes a pixel definition layer, which is located on the side of the light adjustment layer away from the back panel; the pixel definition layer has a plurality of pixel openings, which include at least a first opening, a second opening and a third opening; the first sub-pixel emits blue light through the first opening, the second sub-pixel emits red light through the second opening, and the third sub-pixel emits green light through the third opening; The pixel definition layer also has multiple partition slots, which are located between two adjacent pixel openings.

17. The display substrate as claimed in claim 16, wherein, The partition groove has a groove wall comprising a first section and a second section connected to each other, wherein the first section is farther away from the back plate than the second section; the first section has a first aperture, the second section has a second aperture, and the first aperture is smaller than the second aperture.

18. A display device comprising a display substrate as described in any one of claims 1 to 17.

19. The display device as claimed in claim 18, wherein, The display device further includes a color filter structure layer; the color filter structure layer includes a red light filter, a green light filter, and a blue light filter; the orthographic projection of the blue light filter onto the plane of the back panel at least partially overlaps with the orthographic projection of the first light-emitting functional layer onto the plane of the back panel, the orthographic projection of the red light filter onto the plane of the back panel at least partially overlaps with the orthographic projection of the second light-emitting functional layer onto the plane of the back panel, and the orthographic projection of the green light filter onto the plane of the back panel at least partially overlaps with the orthographic projection of the third light-emitting functional layer onto the plane of the back panel.

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