Display substrate, manufacturing method therefor, and display apparatus

Abstract

The present disclosure provides a display substrate, a manufacturing method therefor and a display apparatus, and belongs to the technical field of display. The display substrate comprises: a driving substrate; and multiple sub-pixels on the driving substrate. Each of the sub-pixels comprises a first electrode, a second electrode, and a light-emitting layer located therebetween. At least two sub-pixels among the multiple sub-pixels are stacked in the direction perpendicular to the driving substrate, the orthographic projections of the at least two sub-pixels on the driving substrate at least partially overlapping each other. The present embodiment can increase the display brightness and the pixel density of display substrates.

Description

Display substrate and its manufacturing method, display device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410504477.7, filed in China on April 24, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of display technology, and in particular to a display substrate, a method for manufacturing the same, and a display device. Background Technology

[0004] OLED (Organic Light-Emitting Diode) display devices have been listed as a promising next-generation display technology due to their advantages such as being thin, light, having a wide viewing angle, being actively emitting light, having continuously adjustable emission colors, having low cost, fast response speed, low energy consumption, low driving voltage, wide operating temperature range, simple manufacturing process, high luminous efficiency, and being flexible in display. Summary of the Invention

[0005] The technical problem to be solved by this disclosure is to provide a display substrate and its manufacturing method, as well as a display device, which can improve the display brightness and pixel density of the display substrate.

[0006] To address the aforementioned technical problems, the embodiments of this disclosure provide the following technical solutions:

[0007] On one hand, a display substrate is provided, comprising:

[0008] Drive substrate;

[0009] Multiple sub-pixels are located on the driving substrate, each sub-pixel including a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode;

[0010] At least two of the plurality of sub-pixels are stacked in a direction perpendicular to the driving substrate, and the orthographic projections of the at least two sub-pixels on the driving substrate at least partially overlap.

[0011] In some embodiments, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel;

[0012] The first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate;

[0013] The third sub-pixel is located on the side of the first sub-pixel and the second sub-pixel that is away from the driving substrate;

[0014] Wherein, the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate.

[0015] In some embodiments, the orthographic projection of the first sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate.

[0016] In some embodiments, the second electrode of each sub-pixel is located on the side of the first electrode away from the driving substrate;

[0017] The first electrode of the first sub-pixel and the first electrode of the second sub-pixel are independent of each other, and the second electrode of the first sub-pixel and the second electrode of the second sub-pixel are an integral structure.

[0018] The first electrode of the third sub-pixel is connected to the second electrode of the first sub-pixel, or the second electrode of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel.

[0019] In some embodiments, along a direction away from the driving substrate, the display substrate comprises, in sequence:

[0020] The first electrode of the first sub-pixel and the first electrode of the second sub-pixel;

[0021] The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel;

[0022] The second electrode of the first sub-pixel and the second electrode of the second sub-pixel;

[0023] The light-emitting layer of the third sub-pixel;

[0024] The second electrode of the third sub-pixel.

[0025] In some embodiments, a first isolation pillar is provided between adjacent third sub-pixels, and the first electrode of the third sub-pixel and the light-emitting layer of the third sub-pixel are disconnected at the first isolation pillar.

[0026] In some embodiments, the color of the first sub-pixel is the same as or different from the color of the third sub-pixel;

[0027] The color of the first sub-pixel is different from the color of the second sub-pixel.

[0028] In some embodiments, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel;

[0029] The first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate;

[0030] The third sub-pixel and the fourth sub-pixel are arranged side by side in a direction parallel to the driving substrate;

[0031] The third sub-pixel and the fourth sub-pixel are located on the side of the first sub-pixel and the second sub-pixel that are away from the driving substrate;

[0032] Wherein, the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the fourth sub-pixel on the driving substrate.

[0033] In some embodiments, the orthographic projection of the first sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate is located within the orthographic projection of the fourth sub-pixel on the driving substrate.

[0034] In some embodiments, the second electrode of each sub-pixel is located on the side of the first electrode away from the driving substrate;

[0035] The first electrode of the first sub-pixel is independent of the first electrode of the second sub-pixel, and the second electrode of the first sub-pixel is independent of the second electrode of the second sub-pixel;

[0036] The first electrode of the third sub-pixel is connected to the second electrode of the first sub-pixel, or the second electrode of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel;

[0037] The first electrode of the fourth sub-pixel is connected to the second electrode of the second sub-pixel, or the second electrode of the second sub-pixel is multiplexed as the first electrode of the fourth sub-pixel;

[0038] The second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel are an integral structure.

[0039] In some embodiments, along a direction away from the driving substrate, the display substrate comprises, in sequence:

[0040] The first electrode of the first sub-pixel and the first electrode of the second sub-pixel;

[0041] The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel;

[0042] The second electrode of the first sub-pixel and the second electrode of the second sub-pixel;

[0043] The light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel;

[0044] The second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel.

[0045] In some embodiments, a second isolation pillar is provided between the third sub-pixel and the fourth sub-pixel, and the first electrode of the third sub-pixel and the first electrode of the fourth sub-pixel are disconnected at the second isolation pillar. The light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel are disconnected at the second isolation pillar.

[0046] In some embodiments, the color of the first sub-pixel is the same as or different from the color of the third sub-pixel;

[0047] The color of the first sub-pixel is different from the color of the second sub-pixel;

[0048] The color of the second sub-pixel may be the same as or different from the color of the fourth sub-pixel;

[0049] The color of the third sub-pixel is different from the color of the fourth sub-pixel.

[0050] This disclosure also provides a display device, including a display substrate as described above.

[0051] This disclosure also provides a method for manufacturing a display substrate, including:

[0052] Fabrication of the driver substrate;

[0053] A plurality of sub-pixels are formed on the driving substrate, each sub-pixel including a first electrode, a second electrode and a light-emitting layer located between the first electrode and the second electrode; at least two of the plurality of sub-pixels are stacked in a direction perpendicular to the driving substrate, and the orthographic projections of the at least two sub-pixels on the driving substrate at least partially overlap.

[0054] In some embodiments, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel; the first sub-pixel and the second sub-pixel are arranged side-by-side in a direction parallel to the driving substrate; the third sub-pixel is located on the side of the first sub-pixel and the second sub-pixel away from the driving substrate; the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate; the fabrication method specifically includes:

[0055] Fabrication of the driver substrate;

[0056] A first electrode of the first sub-pixel and a first electrode of the second sub-pixel are formed on the driving substrate;

[0057] The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel are formed;

[0058] A second electrode is formed for the first sub-pixel and a second electrode is formed for the second sub-pixel. The second electrode of the first sub-pixel and the second electrode of the second sub-pixel are an integral structure. The second electrode of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel.

[0059] The light-emitting layer is formed for the third sub-pixel;

[0060] The second electrode of the third sub-pixel is formed.

[0061] In some embodiments, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel; the first sub-pixel and the second sub-pixel are arranged side-by-side in a direction parallel to the driving substrate; the third sub-pixel and the fourth sub-pixel are arranged side-by-side in a direction parallel to the driving substrate; the third sub-pixel and the fourth sub-pixel are located on the side of the first sub-pixel and the second sub-pixel away from the driving substrate; the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the fourth sub-pixel on the driving substrate; the fabrication method includes:

[0062] Forming a driving substrate;

[0063] A first electrode of the first sub-pixel and a first electrode of the second sub-pixel are formed on the driving substrate;

[0064] The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel are formed;

[0065] A second electrode is formed for the first sub-pixel and a second electrode is formed for the second sub-pixel. The second electrode of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel, and the second electrode of the second sub-pixel is multiplexed as the first electrode of the fourth sub-pixel.

[0066] The light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel are formed;

[0067] The second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel are formed.

[0068] The embodiments disclosed herein have the following beneficial effects:

[0069] In the above scheme, the sub-pixels are stacked on the driving substrate, which can realize the fabrication of multiple sub-pixels in a smaller area, thereby increasing the pixel density of the display substrate. In addition, the light-emitting area of ​​each sub-pixel is also increased, thereby increasing the display brightness of the display substrate and ultimately improving the display effect. Attached Figure Description

[0070] Figure 1 is a schematic diagram of the sub-pixel arrangement according to an embodiment of the present disclosure;

[0071] Figure 2 is a plan view of a display substrate according to an embodiment of the present disclosure;

[0072] Figure 3 is a cross-sectional schematic diagram of a display substrate according to an embodiment of the present disclosure;

[0073] Figure 4 is a schematic diagram of the sub-pixel arrangement according to another embodiment of this disclosure;

[0074] Figure 5 is a plan view of the substrate according to another embodiment of the present disclosure;

[0075] Figure 6 is a cross-sectional schematic diagram of a substrate according to another embodiment of this disclosure.

[0076] Reference numerals: 101 Driving substrate; 102 Electrode layers 202, 204, 1021, 1022, 2021, 2022 (electrodes); 103 Pixel defining layers 104, 1041, 1042 Electrical connection structure; 105 First isolation pillar; 106 Second isolation pillar; 201, 203 Light-emitting layer. Detailed Implementation

[0077] To make the technical problems, technical solutions and advantages of the embodiments of this disclosure clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0078] As people demand higher display quality, there is a need for display panels with high pixel density, high brightness, and long lifespan. Commonly used full-color display devices are achieved by using a white OLED display substrate and a color filter. However, the color filter has low transmittance and significant brightness loss. If a color OLED display substrate is used, color subpixels are generally fabricated through vapor deposition or printing processes. To increase the pixel density of the display substrate, the size of the subpixels needs to be made smaller, which greatly increases the difficulty and cost of the process.

[0079] This disclosure provides a display substrate and its manufacturing method, as well as a display device, which can improve the display brightness and pixel density of the display substrate.

[0080] Embodiments of this disclosure provide a display substrate, comprising:

[0081] Drive substrate;

[0082] Multiple sub-pixels are located on the driving substrate, each sub-pixel including a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode;

[0083] At least two of the plurality of sub-pixels are stacked in a direction perpendicular to the driving substrate, and the orthographic projections of the at least two sub-pixels on the driving substrate at least partially overlap.

[0084] In this embodiment, subpixels are stacked on the driving substrate, allowing multiple subpixels to be fabricated in a smaller area, thereby increasing the pixel density of the display substrate. Furthermore, the light-emitting area of ​​each subpixel is also increased, thereby improving the display brightness of the display substrate and ultimately enhancing the image display effect. This embodiment can improve the display brightness and pixel density of the display substrate without reducing the size of each subpixel, thus reducing process difficulty and manufacturing costs.

[0085] In this embodiment, some sub-pixels of a plurality of sub-pixels may be stacked in a direction perpendicular to the driving substrate, or all sub-pixels of a plurality of sub-pixels may be stacked in a direction perpendicular to the driving substrate. Two layers of sub-pixels may be stacked in the direction perpendicular to the driving substrate, or more layers of sub-pixels may be stacked, such as three or four layers of sub-pixels.

[0086] In some embodiments, as shown in FIG1, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel;

[0087] The first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate;

[0088] The third sub-pixel is located on the side of the first sub-pixel and the second sub-pixel that is away from the driving substrate;

[0089] Wherein, the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate.

[0090] In this embodiment, a first sub-pixel and a second sub-pixel are fabricated side-by-side on the driving substrate, and a third sub-pixel is stacked on top of the first and second sub-pixels. This allows for the fabrication of three sub-pixels in a smaller area, thereby increasing the pixel density of the display substrate. Furthermore, compared to arranging the first, second, and third sub-pixels side-by-side in a direction parallel to the driving substrate, the light-emitting areas of the first and second sub-pixels are increased, and the light-emitting area of ​​the third sub-pixel is significantly increased. This improves the display brightness of the display substrate and ultimately enhances the image display effect.

[0091] In order to maximize the light-emitting area of ​​the third sub-pixel, in some embodiments, the orthographic projection of the first sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate.

[0092] In some embodiments, the second electrode of each sub-pixel is located on the side of the first electrode away from the driving substrate; the first electrode of the first sub-pixel and the first electrode of the second sub-pixel are independent of each other, and the second electrode of the first sub-pixel and the second electrode of the second sub-pixel are an integral structure, which can simplify the manufacturing process and structure of the display substrate;

[0093] The first electrode of the third sub-pixel is connected to the second electrode of the first sub-pixel, or the second electrode of the first sub-pixel is reused as the first electrode of the third sub-pixel, which simplifies the manufacturing process and structure of the display substrate.

[0094] As shown in Figure 1, electrode 102 includes a first electrode 1021 for the first sub-pixel and a first electrode 1022 for the second sub-pixel. Electrode 202 serves as the second electrode for both the first and second sub-pixels, and is also reused as the first electrode for the third sub-pixel. Electrode 204 serves as the second electrode for the third sub-pixel. Applying an electrical signal to electrodes 1021 and 202 creates an electric field V1 that controls the first sub-pixel to display; applying an electrical signal to electrodes 1022 and 202 creates an electric field V2 that controls the second sub-pixel to display; and applying an electrical signal to electrodes 204 and 202 creates an electric field V3 that controls the third sub-pixel to display. This allows for individual driving and light emission of each sub-pixel.

[0095] The colors of the first sub-pixel and the second sub-pixel can be different, and the colors of the first sub-pixel and the third sub-pixel can be the same or different.

[0096] For example, the first, second, and third sub-pixels can be three different colored sub-pixels, selected from red, blue, and green sub-pixels. Electric fields V1, V2, and V3 can control the display of each of these three colors, enabling individual driving and emission of light from each sub-pixel, thus achieving full-color illumination of the display substrate. The colors of the first, second, and third sub-pixels can be designed as needed. For instance, since blue luminescent materials generally have lower luminous efficiency and lifespan, the third sub-pixel can be designed as a blue sub-pixel. This increases the luminous area of ​​the blue sub-pixel, ensuring its brightness and lifespan. Of course, the third sub-pixel is not limited to blue; it can also be a sub-pixel of other colors.

[0097] The first sub-pixel can also be the same color as the third sub-pixel. For example, since blue luminescent materials generally have low luminous efficiency and lifespan, both the first and third sub-pixels can be designed to be blue. This increases the luminous area of ​​the blue sub-pixels, ensuring their brightness and lifespan on the display substrate. Of course, the third and first sub-pixels are not limited to blue; they can also be other colors. The design of the first, third, and second sub-pixels can be based on the luminous efficiency or lifespan of the luminescent materials of each color.

[0098] Alternatively, the second sub-pixel can be the same color as the third sub-pixel. For example, since blue luminescent materials generally have low luminous efficiency and lifespan, both the second and third sub-pixels can be designed to be blue. This increases the luminous area of ​​the blue sub-pixels, ensuring their brightness and lifespan on the display substrate. Of course, the third and second sub-pixels are not limited to blue; they can also be other colors. The design of the first, third, and second sub-pixels can be based on the luminous efficiency or lifespan of the luminescent materials for each color.

[0099] In some embodiments, the first sub-pixel and the third sub-pixel may be sub-pixels of the same color in a certain area of ​​the display substrate; the second sub-pixel and the third sub-pixel may be sub-pixels of the same color in another area of ​​the display substrate; and the first sub-pixel, the second sub-pixel, and the third sub-pixel may be sub-pixels of different colors in yet another area of ​​the display substrate.

[0100] Those skilled in the art should understand that, in order to achieve individual driving of light emission for each sub-pixel, electrodes 1021, 1022, 204, and 202 all need to be connected to the signal lines on the driving substrate through separate electrical connection structures.

[0101] Figure 2 is a planar schematic diagram of the display substrate in this embodiment. As shown in Figure 2, each pixel region P includes a first sub-pixel region P1, a second sub-pixel region P2, and a third sub-pixel region P3. The first sub-pixel region P1 and the second sub-pixel region P2 are placed side by side, and the third sub-pixel region P3 is stacked on top of the first sub-pixel region P1 and the second sub-pixel region P2. The orthographic projection of the first sub-pixel region P1 on the driving substrate is located within the orthographic projection of the third sub-pixel region P3 on the driving substrate, and the orthographic projection of the second sub-pixel region P2 on the driving substrate is located within the orthographic projection of the third sub-pixel region P3 on the driving substrate. In this way, the space occupied by two sub-pixels on the driving substrate can be used to realize the light emission of three sub-pixels, which can improve the pixel density of the display substrate. In addition, compared with the three sub-pixel regions arranged side by side in pixel region P, the light emission area of ​​each sub-pixel region is increased, which can improve the display brightness of the display substrate. For the third sub-pixel, the light emission area is doubled, which can improve the light emission brightness and lifespan of the third sub-pixel.

[0102] In some embodiments, along a direction away from the driving substrate, the display substrate comprises, in sequence:

[0103] The first electrode of the first sub-pixel and the first electrode of the second sub-pixel;

[0104] The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel;

[0105] The second electrode of the first sub-pixel and the second electrode of the second sub-pixel;

[0106] The light-emitting layer of the third sub-pixel;

[0107] The second electrode of the third sub-pixel.

[0108] Figure 3 is a cross-sectional schematic diagram of the display substrate shown in Figure 2 along the AA direction. As shown in Figure 3, the display substrate includes a driving substrate 101, which may include a substrate and a driving circuit layer disposed on the substrate. The driving circuit layer includes a thin-film transistor array and signal lines, etc. The display substrate also includes an electrode layer 102 located on the driving substrate 101. The electrode layer 102 includes a first electrode 1021 of a first sub-pixel and a first electrode 1022 of a second sub-pixel. A pixel defining layer 103 is located on the driving substrate 101, which defines a first sub-pixel region P1 and a second sub-pixel region P2. A light-emitting layer 201 includes a light-emitting layer of the first sub-pixel and a light-emitting layer of the second sub-pixel. When the colors of the first sub-pixel and the second sub-pixel are different, the light-emitting layers of the first sub-pixel and the second sub-pixel use different light-emitting materials. An electrode 202 includes a second electrode of the first sub-pixel and a second electrode of the second sub-pixel, and also serves as a first electrode of a third sub-pixel. A light-emitting layer 203 serves as a light-emitting layer of the third sub-pixel. An electrode 204 serves as a second electrode of the third sub-pixel. Furthermore, the display substrate also includes an electrical connection structure 104 located on the driving substrate 101. The electrode 202 can be connected to the signal line on the driving substrate 101 through the electrical connection structure 104. A first isolation pillar 105 is also provided on the pixel defining layer 103. The angle between the side surface of the first isolation pillar 105 and the surface of the driving substrate 101 can be 90° or less. When the electrode 202 and the light-emitting layer 203 are formed by the vapor deposition process, due to the characteristics of the vapor deposition process, the evaporated atoms and molecules are difficult to collide in a high vacuum environment and move in an approximately linear motion. Therefore, a film cannot be vapor-deposited at the obstruction or approximately vertical step. Thus, the electrode 202 and the light-emitting layer 203 are disconnected at the first isolation pillar 105, and the electrode 202 and the light-emitting layer 203 can be divided into different third sub-pixel electrodes 202 and light-emitting layers 203. That is, the first isolation pillar 105 acts as a pixel defining layer and can define multiple third sub-pixel regions P3.

[0109] In this embodiment, the light-emitting layer includes various organic functional layers of the sub-pixels, including but not limited to hole injection layer (HIL), electron injection layer (EIL), hole transport layer (HTL), electron transport layer (ETL), electron blocking layer (EBL), hole blocking layer (HBL), organic light-emitting layer (EML), etc.

[0110] In some embodiments, as shown in FIG4, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel;

[0111] The first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate;

[0112] The third sub-pixel and the fourth sub-pixel are arranged side by side in a direction parallel to the driving substrate;

[0113] The third sub-pixel and the fourth sub-pixel are located on the side of the first sub-pixel and the second sub-pixel that are away from the driving substrate;

[0114] Wherein, the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the fourth sub-pixel on the driving substrate.

[0115] In this embodiment, a first sub-pixel and a second sub-pixel, a third sub-pixel and a fourth sub-pixel are fabricated side by side on the driving substrate, and the third sub-pixel and the fourth sub-pixel are stacked on the first sub-pixel and the second sub-pixel. This allows for the fabrication of four sub-pixels in a smaller area, thereby increasing the pixel density of the display substrate.

[0116] In some embodiments, in order to maximize the light-emitting area of ​​the third sub-pixel and the fourth sub-pixel, the orthographic projection of the first sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate is located within the orthographic projection of the fourth sub-pixel on the driving substrate.

[0117] In some embodiments, the second electrode of each sub-pixel is located on the side of the first electrode away from the driving substrate;

[0118] The first electrode of the first sub-pixel is independent of the first electrode of the second sub-pixel, and the second electrode of the first sub-pixel is independent of the second electrode of the second sub-pixel;

[0119] The first electrode of the third sub-pixel is connected to the second electrode of the first sub-pixel, or the second electrode of the first sub-pixel is reused as the first electrode of the third sub-pixel, which simplifies the manufacturing process and structure of the display substrate.

[0120] The first electrode of the fourth sub-pixel is connected to the second electrode of the second sub-pixel, or the second electrode of the second sub-pixel is reused as the first electrode of the fourth sub-pixel, which simplifies the manufacturing process and structure of the display substrate.

[0121] The second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel are integrated into one structure, which simplifies the manufacturing process and structure of the display substrate.

[0122] As shown in Figure 4, electrode 102 includes a first electrode 1021 for a first sub-pixel and a first electrode 1022 for a second sub-pixel. Electrode 202 includes a second electrode 2021 for a first sub-pixel and a second electrode 2022 for a second sub-pixel. The second electrode 2021 of the first sub-pixel is also reused as the first electrode of a third sub-pixel, and the second electrode 2022 of the second sub-pixel is also reused as the first electrode of a fourth sub-pixel. Electrode 204 serves as the second electrode of both the third and fourth sub-pixels. Applying an electrical signal to electrodes 1021 and 2021 forms an electric field V1, which controls the display of the first sub-pixel. Applying an electrical signal to electrodes 1022 and 2022 forms an electric field V2, which controls the display of the second sub-pixel. Applying an electrical signal to electrodes 2021 and 204 forms an electric field V3, which controls the display of the third sub-pixel. Applying an electrical signal to electrodes 2022 and 204 forms an electric field V4, which controls the display of the fourth sub-pixel.

[0123] Those skilled in the art should understand that, in order to achieve individual driving of light emission for each sub-pixel, electrodes 1021, 1022, 2021, 2022 and 204 all need to be connected to the signal lines on the driving substrate through separate electrical connection structures.

[0124] In some embodiments, the color of the first sub-pixel is the same as or different from the color of the third sub-pixel; the color of the first sub-pixel is different from the color of the second sub-pixel; the color of the second sub-pixel is the same as or different from the color of the fourth sub-pixel; and the color of the third sub-pixel is different from the color of the fourth sub-pixel.

[0125] For example, the first, second, third, and fourth sub-pixels can be four different colored sub-pixels, selected from red, blue, green, and white sub-pixels. Electric fields V1, V2, V3, and V4 can control the display of each of these four colors, enabling individual driving and emission of light from each sub-pixel, thus achieving full-color illumination of the display substrate. The colors of the first, second, third, and fourth sub-pixels can be designed as needed. For instance, since blue luminescent materials generally have lower luminous efficiency and lifespan, the sub-pixel with the largest area can be designed as a blue sub-pixel. This increases the luminous area of ​​the blue sub-pixel, ensuring its brightness and lifespan.

[0126] The first sub-pixel can also be the same color as the third sub-pixel. For example, since blue luminescent materials generally have low luminous efficiency and lifespan, both the first and third sub-pixels can be designed to be blue. This increases the luminous area of ​​the blue sub-pixels, ensuring their brightness and lifespan on the display substrate. Of course, the third and first sub-pixels are not limited to blue; they can also be other colors. The design of the first, third, second, and fourth sub-pixels can be based on the luminous efficiency or lifespan of the luminescent materials of each color.

[0127] Alternatively, the second sub-pixel can be the same color as the fourth sub-pixel. For example, since blue luminescent materials generally have low luminous efficiency and lifespan, both the second and fourth sub-pixels can be designed to be blue. This increases the luminous area of ​​the blue sub-pixels, ensuring their brightness and lifespan on the display substrate. Of course, the fourth and second sub-pixels are not limited to blue; they can also be other colors. The design of the first, third, second, and fourth sub-pixels can be based on the luminous efficiency or lifespan of the luminescent materials for each color.

[0128] Alternatively, the first sub-pixel can be the same color as the fourth sub-pixel. For example, since blue luminescent materials generally have low luminous efficiency and lifespan, both the first and fourth sub-pixels can be designed to be blue. This increases the luminous area of ​​the blue sub-pixels, ensuring their brightness and lifespan on the display substrate. Of course, the fourth and first sub-pixels are not limited to blue; they can also be other colors. The design of the first, third, second, and fourth sub-pixels can be based on the luminous efficiency or lifespan of the luminescent materials of each color.

[0129] Alternatively, the second sub-pixel can be the same color as the third sub-pixel. For example, since blue luminescent materials generally have low luminous efficiency and lifespan, the second and third sub-pixels can be designed to be blue. This increases the luminous area of ​​the blue sub-pixels, ensuring their brightness and lifespan on the display substrate. Of course, the second and third sub-pixels are not limited to blue; they can be other colors as well. The design of the first, third, second, and fourth sub-pixels can be based on the luminous efficiency or lifespan of the luminescent materials for each color.

[0130] In some embodiments, the first sub-pixel and the third sub-pixel may be sub-pixels of the same color in a certain area of ​​the display substrate; the second sub-pixel and the fourth sub-pixel may be sub-pixels of the same color in another area of ​​the display substrate; and the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel may be sub-pixels of different colors in yet another area of ​​the display substrate.

[0131] Figure 5 is a planar schematic diagram of the display substrate in this embodiment. As shown in Figure 5, each pixel region P includes a first sub-pixel region P1, a second sub-pixel region P2, a third sub-pixel region P3, and a fourth sub-pixel region P4. The first sub-pixel region P1 and the second sub-pixel region P2 are placed side by side, and the third sub-pixel region P3 and the fourth sub-pixel region P4 are placed side by side. The third sub-pixel region P3 and the fourth sub-pixel region P4 are stacked on top of the first sub-pixel region P1 and the second sub-pixel region P2. The orthographic projection of the first sub-pixel region P1 on the driving substrate is located within the orthographic projection of the third sub-pixel region P3 on the driving substrate, and the orthographic projection of the second sub-pixel region P2 on the driving substrate is located within the orthographic projection of the fourth sub-pixel region P4 on the driving substrate. In this way, the space occupied by two sub-pixels on the driving substrate can be used to realize the light emission of four sub-pixels, which can improve the pixel density of the display substrate. In addition, compared with the four sub-pixel regions arranged side by side in pixel region P, the light emission area of ​​each sub-pixel region is increased, which can improve the display brightness of the display substrate.

[0132] In some embodiments, along a direction away from the driving substrate, the display substrate comprises, in sequence:

[0133] The first electrode of the first sub-pixel and the first electrode of the second sub-pixel;

[0134] The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel;

[0135] The second electrode of the first sub-pixel and the second electrode of the second sub-pixel;

[0136] The light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel;

[0137] The second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel.

[0138] Figure 6 is a cross-sectional schematic diagram of the display substrate shown in Figure 5 along the AA direction. As shown in Figure 6, the display substrate includes a driving substrate 101, which may include a substrate and a driving circuit layer disposed on the substrate. The driving circuit layer includes a thin-film transistor array and signal lines, etc. The display substrate also includes an electrode layer 102 located on the driving substrate 101, which includes a first electrode 1021 of a first sub-pixel and a first electrode 1022 of a second sub-pixel. A pixel defining layer 103 is located on the driving substrate 101, which defines a first sub-pixel region P1 and a second sub-pixel region P2. A light-emitting layer 201 is also included, which includes a light-emitting layer for the first sub-pixel and a light-emitting layer for the second sub-pixel. When the color of the first sub-pixel is different from that of the second sub-pixel, the light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel use different light-emitting materials; electrode 202, electrode 202 includes the second electrode 2021 of the first sub-pixel and the second electrode 2022 of the second sub-pixel, the second electrode 2021 of the first sub-pixel also serves as the first electrode of the third sub-pixel, and the second electrode 2022 of the second sub-pixel also serves as the first electrode of the fourth sub-pixel; light-emitting layer 203, including the light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel, when the color of the third sub-pixel and the fourth sub-pixel are different, the light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel use different light-emitting materials; electrode 204, serving as the second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel. Furthermore, the display substrate also includes an electrical connection structure 1041 and an electrical connection structure 1042 located on the driving substrate 101. Electrode 2021 can be connected to a signal line on the driving substrate 101 via the electrical connection structure 1041, and electrode 2022 can be connected to a signal line on the driving substrate 101 via the electrical connection structure 1042. The driving substrate also has a first isolation pillar 105 and a second isolation pillar 106. The angle between the side surfaces of the first isolation pillar 105 and the second isolation pillar 106 and the surface of the driving substrate 101 can be 90° or less. When forming the electrode 202 and the light-emitting layer 203 using the vapor deposition process, due to the characteristics of the vapor deposition process, the evaporated atoms and molecules are difficult to collide in a high vacuum environment and move in an approximately linear motion. Therefore, a film cannot be deposited at places with obstructions or approximately vertical steps. Thus, the electrode 202 and the light-emitting layer 203 are separated by the first isolation pillar 105 and the second isolation pillar 106, and can be divided into a third sub-pixel and a fourth sub-pixel. That is, the first isolation pillar 105 and the second isolation pillar 106 act as pixel delimiting layers, which can define the third sub-pixel region P3 and the fourth sub-pixel region P4.

[0139] In this embodiment, the light-emitting layer includes various organic functional layers of the sub-pixels, including but not limited to hole injection layer (HIL), electron injection layer (EIL), hole transport layer (HTL), electron transport layer (ETL), electron blocking layer (EBL), hole blocking layer (HBL), organic light-emitting layer (EML), etc.

[0140] This disclosure also provides a display device, including a display substrate as described above.

[0141] The display device includes, but is not limited to, components such as: a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art will understand that the structure of the display device described above does not constitute a limitation on the display device; the display device may include more or fewer of the aforementioned components, or combine certain components, or arrange different components. In the embodiments of this disclosure, the display device includes, but is not limited to, a monitor, a mobile phone, a tablet computer, a television set, a wearable electronic device, a navigation display device, etc.

[0142] The display device can be any product or component with display function, such as a television, monitor, digital photo frame, mobile phone, or tablet computer. The display device also includes a flexible circuit board, a printed circuit board, and a backplate.

[0143] This disclosure also provides a method for manufacturing a display substrate, including:

[0144] Fabrication of the driver substrate;

[0145] A plurality of sub-pixels are formed on the driving substrate, each sub-pixel including a first electrode, a second electrode and a light-emitting layer located between the first electrode and the second electrode; at least two of the plurality of sub-pixels are stacked in a direction perpendicular to the driving substrate, and the orthographic projections of the at least two sub-pixels on the driving substrate at least partially overlap.

[0146] In this embodiment, subpixels are stacked on the driving substrate, allowing multiple subpixels to be fabricated in a smaller area, thereby increasing the pixel density of the display substrate. Furthermore, the light-emitting area of ​​each subpixel is also increased, thereby improving the display brightness of the display substrate and ultimately enhancing the image display effect. This embodiment can improve the display brightness and pixel density of the display substrate without reducing the size of each subpixel, thus reducing process difficulty and manufacturing costs.

[0147] In this embodiment, some sub-pixels of a plurality of sub-pixels may be stacked in a direction perpendicular to the driving substrate, or all sub-pixels of a plurality of sub-pixels may be stacked in a direction perpendicular to the driving substrate. Two layers of sub-pixels may be stacked in the direction perpendicular to the driving substrate, or more layers of sub-pixels may be stacked, such as three or four layers of sub-pixels.

[0148] In some embodiments, as shown in FIG1, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel; the first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate; the third sub-pixel is located on the side of the first sub-pixel and the second sub-pixel away from the driving substrate; the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate; the fabrication method specifically includes:

[0149] Step 1: Fabricate the driver substrate;

[0150] As shown in Figure 3, the driving substrate 101 may include a substrate and a driving circuit layer disposed on the substrate. The driving circuit layer includes a thin film transistor array and signal lines, etc.

[0151] Step 2: Form the first electrode of the first sub-pixel and the first electrode of the second sub-pixel on the driving substrate;

[0152] As shown in Figure 3, an electrode layer 102 can be fabricated on the driving substrate 101 using ITO, Ag, or a composite material of both. Photoresist is coated on the electrode layer 102, and the photoresist is exposed and developed to form a photoresist pattern. The electrode layer 102 is etched using the photoresist pattern as a mask to obtain the first electrode 1021 of the first sub-pixel and the first electrode 1022 of the second sub-pixel.

[0153] Step 3: Form a pixel boundary layer;

[0154] As shown in Figure 3, a pixel defining layer 103 is formed on the driving substrate 101. The pixel defining layer 103 is a hydrophobic material, which can be a fluorinated resin material. The thickness is generally 1 to 2 μm and the slope angle is 40 to 60°. The pixel defining layer 103 defines a first sub-pixel region P1 and a second sub-pixel region P2.

[0155] Step 4: Form the first isolation pillars on the pixel boundary layer;

[0156] As shown in Figure 3, the first isolation column 105 can be a columnar structure with a slope angle of 80° to 120°, and can be a resin structure, PI or other materials. The bottom width can be 1 to 3 μm and the height can be 0.1 to 0.5 μm.

[0157] Step 5: Form the light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel;

[0158] As shown in Figure 3, the light-emitting layer 201 can be fabricated using inkjet printing technology, including a hole injection layer (HIL), an electron injection layer (EIL), a hole transport layer (HTL), an electron transport layer (ETL), an electron blocking layer (EBL), a hole blocking layer (HBL), and an organic light-emitting layer (EML). Specifically, the light-emitting layer of the first sub-pixel can be formed within the first sub-pixel region P1 defined by the pixel defining layer 103, and the light-emitting layer of the second sub-pixel can be formed within the second sub-pixel region P2 defined by the pixel defining layer 103. When the colors of the first sub-pixel and the second sub-pixel are different, the light-emitting layers of the first and second sub-pixels use different light-emitting materials.

[0159] Step 6: Form the second electrode of the first sub-pixel and the second electrode of the second sub-pixel;

[0160] As shown in Figure 3, electrode 202 can be formed using a vapor deposition process. Electrode 202 includes the second electrode of the first sub-pixel and the second electrode of the second sub-pixel, and is also reused as the first electrode of the third sub-pixel. Electrode 202 can be made of a metal with high transmittance, such as Ag, Al, and Mg / Ag, with a thickness of 50-200 angstroms. Electrode 202 can be connected to the signal lines on the driving substrate 101 through the electrical connection structure 104. Due to the characteristics of the vapor deposition process, the evaporated atoms and molecules are difficult to collide in a high vacuum environment and move in approximately linear motion. Therefore, films cannot be deposited at locations with obstructions or approximately vertical steps. Electrode 202, which can be divided into different third sub-pixels, means that the first isolation pillar 105 acts as a pixel defining layer, which can define multiple third sub-pixel regions P3.

[0161] Step 7: Form the light-emitting layer 203 of the third sub-pixel;

[0162] As shown in Figure 3, the light-emitting layer 203 can be formed by vapor deposition. Due to the characteristics of vapor deposition, the evaporated atoms and molecules are difficult to collide in a high vacuum environment and move in an approximately linear motion. Therefore, it is impossible to vapor deposit a film at places with obstructions or approximately vertical steps. The light-emitting layer 203 is broken at the first isolation pillar 105 and divided into light-emitting layers of different third sub-pixels. That is, the first isolation pillar 105 acts as a pixel delimitation layer, which can define multiple third sub-pixel regions P3.

[0163] Step 8: Form the second electrode of the third sub-pixel.

[0164] As shown in Figure 3, IZO thin films can be deposited using magnetron sputtering to form electrode 204. The thin films produced by magnetron sputtering have good diffraction and ramp-up properties, and can cover the first isolation pillar 105 to form a continuous conductive film.

[0165] In this embodiment, a first sub-pixel and a second sub-pixel are fabricated side-by-side on the driving substrate, and a third sub-pixel is stacked on top of the first and second sub-pixels. This allows for the fabrication of three sub-pixels in a smaller area, thereby increasing the pixel density of the display substrate. Furthermore, compared to arranging the first, second, and third sub-pixels side-by-side in a direction parallel to the driving substrate, the light-emitting areas of the first and second sub-pixels are increased, and the light-emitting area of ​​the third sub-pixel is significantly increased. This improves the display brightness of the display substrate and ultimately enhances the image display effect.

[0166] In some embodiments, as shown in FIG4, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel; the first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate; the third sub-pixel and the fourth sub-pixel are arranged side by side in a direction parallel to the driving substrate; the third sub-pixel and the fourth sub-pixel are located on the side of the first sub-pixel and the second sub-pixel away from the driving substrate; the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the fourth sub-pixel on the driving substrate; the fabrication method includes:

[0167] Step 1: Fabricate the driver substrate;

[0168] As shown in Figure 6, the driving substrate 101 may include a substrate and a driving circuit layer disposed on the substrate. The driving circuit layer includes a thin film transistor array and signal lines, etc.

[0169] Step 2: Form the first electrode of the first sub-pixel and the first electrode of the second sub-pixel on the driving substrate;

[0170] As shown in Figure 6, an electrode layer 102 can be fabricated on the driving substrate 101 using ITO, Ag, or a composite material of both. Photoresist is coated on the electrode layer 102, and the photoresist is exposed and developed to form a photoresist pattern. The electrode layer 102 is etched using the photoresist pattern as a mask to obtain the first electrode 1021 of the first sub-pixel and the first electrode 1022 of the second sub-pixel.

[0171] Step 3: Form a pixel boundary layer;

[0172] As shown in Figure 6, a pixel defining layer 103 is formed on the driving substrate 101. The pixel defining layer 103 is a hydrophobic material, which can be a fluorinated resin material. The thickness is generally 1 to 2 μm and the slope angle is 40 to 60°. The pixel defining layer 103 defines a first sub-pixel region P1 and a second sub-pixel region P2.

[0173] Step 4: Form a first isolation pillar on the pixel boundary layer, and create a second isolation pillar between the pixel boundary layer between the first sub-pixel and the second sub-pixel;

[0174] As shown in Figure 6, the first isolation column 105 can be a columnar structure with a slope angle of 80° to 120°, and can be a resin structure, PI or other materials, with a bottom width of 1 to 3 μm and a height of 0.1 to 0.5 μm; the second isolation column 106 can be a columnar structure with a slope angle of 80° to 120°, and can be a resin structure, PI or other materials, with a bottom width of 1 to 3 μm and a height of 0.1 to 0.5 μm.

[0175] Step 5: Form the light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel;

[0176] As shown in Figure 6, the light-emitting layer 201 can be fabricated using inkjet printing technology, including a hole injection layer (HIL), an electron injection layer (EIL), a hole transport layer (HTL), an electron transport layer (ETL), an electron blocking layer (EBL), a hole blocking layer (HBL), and an organic light-emitting layer (EML). Specifically, the light-emitting layer of the first sub-pixel can be formed within the first sub-pixel region P1 defined by the pixel defining layer 103, and the light-emitting layer of the second sub-pixel can be formed within the second sub-pixel region P2 defined by the pixel defining layer 103. When the colors of the first sub-pixel and the second sub-pixel are different, the light-emitting layers of the first and second sub-pixels use different light-emitting materials.

[0177] Step 6: Form the second electrode of the first sub-pixel and the second electrode of the second sub-pixel;

[0178] As shown in Figure 6, electrodes 202 can be formed using a vapor deposition process. Electrode 202 includes a second electrode 2021 for the first sub-pixel and a second electrode 2022 for the second sub-pixel. Simultaneously, the second electrode 2021 of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel, and the second electrode 2022 of the second sub-pixel is multiplexed as the first electrode of the fourth sub-pixel. Electrode 202 can be made of a metal with high transmittance, such as Ag, Al, and Mg / Ag, with a thickness of 50–200 angstroms. The second electrode 2021 of the first sub-pixel can be connected to a signal line on the driving substrate 101 via an electrical connection structure 1041, and the second electrode 2022 of the second sub-pixel can be connected to a signal line on the driving substrate 101 via an electrical connection structure 1042.

[0179] Due to the characteristics of the vapor deposition process, the evaporated atoms and molecules are difficult to collide in a high vacuum environment and move in an approximately linear motion. Therefore, a film cannot be deposited at places with obstructions or approximately vertical steps. The electrode 202 is broken at the first isolation pillar 105 and the second isolation pillar 106, and divided into the second electrode of the first sub-pixel and the second electrode of the second sub-pixel. That is, the first isolation pillar 105 and the second isolation pillar 106 act as a pixel defining layer, which can define the third sub-pixel region P3 and the fourth sub-pixel region P4.

[0180] Step 7: Form the light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel;

[0181] As shown in Figure 6, the light-emitting layer 203 can be formed using a vapor deposition process. Due to the characteristics of the vapor deposition process, the evaporated atoms and molecules are unlikely to collide in a high vacuum environment and move in approximately linear motion. Therefore, film deposition is not possible at locations with obstructions or approximately vertical steps. The light-emitting layer 203 is broken at the point where the first isolation pillar 105 and the second isolation pillar 106 intersect, dividing it into the light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel. That is, the first isolation pillar 105 and the second isolation pillar 106 act as pixel delimiting layers, defining the third sub-pixel region P3 and the fourth sub-pixel region P4. When the colors of the third and fourth sub-pixels are different, the light-emitting layers of the third and fourth sub-pixels use different light-emitting materials.

[0182] Step 8: Form the second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel.

[0183] As shown in Figure 6, IZO thin films can be deposited using magnetron sputtering to form electrodes 204. The thin films produced by magnetron sputtering have good diffraction and climbing performance, and can cover the first isolation pillar 105 and the second isolation pillar 106 to form a continuous conductive film, which serves as the second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel. The second electrodes of the third sub-pixel and the second electrodes of the fourth sub-pixel are an integral structure.

[0184] In this embodiment, the light emission of four sub-pixels can be achieved by utilizing the driving substrate space occupied by two sub-pixels, which can improve the pixel density of the display substrate. In addition, compared with setting four sub-pixel regions side by side in pixel region P, the light emission area of ​​each sub-pixel region is increased, which can improve the display brightness of the display substrate.

[0185] In the various method embodiments of this disclosure, the sequence numbers of each step are not intended to limit the order of the steps. For those skilled in the art, any changes in the order of the steps are within the scope of protection of this disclosure without any creative effort.

[0186] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, since the embodiments are basically similar to the product embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions of the product embodiments.

[0187] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0188] It is understandable that when a component such as a layer, film, region, or substrate is referred to as being "above" or "below" another component, the component may be "directly" located "above" or "below" the other component, or there may be intermediate components present.

[0189] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0190] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display substrate, characterized in that, include: Drive substrate; Multiple sub-pixels are located on the driving substrate, each sub-pixel including a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode; At least two of the plurality of sub-pixels are stacked in a direction perpendicular to the driving substrate, and the orthographic projections of the at least two sub-pixels on the driving substrate at least partially overlap.

2. The display substrate according to claim 1, characterized in that, The plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel; The first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate; The third sub-pixel is located on the side of the first sub-pixel and the second sub-pixel that is away from the driving substrate; Wherein, the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate.

3. The display substrate according to claim 2, characterized in that, The orthographic projection of the first sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate.

4. The display substrate according to claim 2 or 3, characterized in that, The second electrode of each sub-pixel is located on the side of the first electrode away from the driving substrate; The first electrode of the first sub-pixel and the first electrode of the second sub-pixel are independent of each other, and the second electrode of the first sub-pixel and the second electrode of the second sub-pixel are an integral structure. The first electrode of the third sub-pixel is connected to the second electrode of the first sub-pixel, or the second electrode of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel.

5. The display substrate according to claim 4, characterized in that, Along a direction away from the driving substrate, the display substrate comprises, in sequence: The first electrode of the first sub-pixel and the first electrode of the second sub-pixel; The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel; The second electrode of the first sub-pixel and the second electrode of the second sub-pixel; The light-emitting layer of the third sub-pixel; The second electrode of the third sub-pixel.

6. The display substrate according to claim 4, characterized in that, A first isolation pillar is provided between adjacent third sub-pixels, and the first electrode of the third sub-pixel and the light-emitting layer of the third sub-pixel are disconnected at the first isolation pillar.

7. The display substrate according to claim 2 or 3, characterized in that, The color of the first sub-pixel may be the same as or different from the color of the third sub-pixel; The color of the first sub-pixel is different from the color of the second sub-pixel.

8. The display substrate according to claim 1, characterized in that, The plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel; The first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate; The third sub-pixel and the fourth sub-pixel are arranged side by side in a direction parallel to the driving substrate; The third sub-pixel and the fourth sub-pixel are located on the side of the first sub-pixel and the second sub-pixel that are away from the driving substrate; Wherein, the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the fourth sub-pixel on the driving substrate.

9. The display substrate according to claim 8, characterized in that, The orthographic projection of the first sub-pixel on the driving substrate is located within the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate is located within the orthographic projection of the fourth sub-pixel on the driving substrate.

10. The display substrate according to claim 8 or 9, characterized in that, The second electrode of each sub-pixel is located on the side of the first electrode away from the driving substrate; The first electrode of the first sub-pixel is independent of the first electrode of the second sub-pixel, and the second electrode of the first sub-pixel is independent of the second electrode of the second sub-pixel; The first electrode of the third sub-pixel is connected to the second electrode of the first sub-pixel, or the second electrode of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel; The first electrode of the fourth sub-pixel is connected to the second electrode of the second sub-pixel, or the second electrode of the second sub-pixel is multiplexed as the first electrode of the fourth sub-pixel; The second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel are an integral structure.

11. The display substrate according to claim 10, characterized in that, Along a direction away from the driving substrate, the display substrate comprises, in sequence: The first electrode of the first sub-pixel and the first electrode of the second sub-pixel; The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel; The second electrode of the first sub-pixel and the second electrode of the second sub-pixel; The light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel; The second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel.

12. The display substrate according to claim 11, characterized in that, A second isolation pillar is provided between the third sub-pixel and the fourth sub-pixel, and the first electrode of the third sub-pixel and the first electrode of the fourth sub-pixel are disconnected at the second isolation pillar; the light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel are disconnected at the second isolation pillar.

13. The display substrate according to claim 8 or 9, characterized in that, The color of the first sub-pixel may be the same as or different from the color of the third sub-pixel; The color of the first sub-pixel is different from the color of the second sub-pixel; The color of the second sub-pixel may be the same as or different from the color of the fourth sub-pixel; The color of the third sub-pixel is different from the color of the fourth sub-pixel.

14. A display device, characterized in that, Includes the display substrate as described in any one of claims 1-13.

15. A method for manufacturing a display substrate, characterized in that, include: Fabrication of the driver substrate; A plurality of sub-pixels are formed on the driving substrate, each sub-pixel including a first electrode, a second electrode and a light-emitting layer located between the first electrode and the second electrode; at least two of the plurality of sub-pixels are stacked in a direction perpendicular to the driving substrate, and the orthographic projections of the at least two sub-pixels on the driving substrate at least partially overlap.

16. The method for manufacturing a display substrate according to claim 15, characterized in that, The plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel; the first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate; the third sub-pixel is located on the side of the first sub-pixel and the second sub-pixel away from the driving substrate; the orthographic projection of the first sub-pixel on the driving substrate and the orthographic projection of the third sub-pixel on the driving substrate at least partially overlap; The manufacturing method specifically includes: Fabrication of the driver substrate; A first electrode of the first sub-pixel and a first electrode of the second sub-pixel are formed on the driving substrate; The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel are formed; A second electrode is formed for the first sub-pixel and a second electrode is formed for the second sub-pixel. The second electrode of the first sub-pixel and the second electrode of the second sub-pixel are an integral structure. The second electrode of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel. The light-emitting layer is formed for the third sub-pixel; The second electrode of the third sub-pixel is formed.

17. The method for manufacturing a display substrate according to claim 15, characterized in that, The plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel; the first sub-pixel and the second sub-pixel are arranged side by side in a direction parallel to the driving substrate; the third sub-pixel and the fourth sub-pixel are arranged side by side in a direction parallel to the driving substrate; the third sub-pixel and the fourth sub-pixel are located on the side of the first sub-pixel and the second sub-pixel away from the driving substrate; the orthographic projection of the first sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the third sub-pixel on the driving substrate, and the orthographic projection of the second sub-pixel on the driving substrate at least partially overlaps with the orthographic projection of the fourth sub-pixel on the driving substrate; The manufacturing method includes: Forming a driving substrate; A first electrode of the first sub-pixel and a first electrode of the second sub-pixel are formed on the driving substrate; The light-emitting layer of the first sub-pixel and the light-emitting layer of the second sub-pixel are formed; A second electrode is formed for the first sub-pixel and a second electrode is formed for the second sub-pixel. The second electrode of the first sub-pixel is multiplexed as the first electrode of the third sub-pixel, and the second electrode of the second sub-pixel is multiplexed as the first electrode of the fourth sub-pixel. The light-emitting layer of the third sub-pixel and the light-emitting layer of the fourth sub-pixel are formed; The second electrode of the third sub-pixel and the second electrode of the fourth sub-pixel are formed.

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