Display substrate and display device

Abstract

The application provides a display substrate and a display device, and relates to the technical field of display. The display substrate has a display area, the display area is provided with a plurality of sub-pixels, the plurality of sub-pixels include at least one first sub-pixel, and the first sub-pixel includes a first electrode. The display substrate includes a pixel definition layer, the pixel definition layer is located on the side of the first electrode close to the light-emitting surface of the display substrate. The pixel definition layer has a first opening, and the first opening exposes part of the first electrode. The ratio of the area of the part of the first electrode exposed by the first opening to the area of the first electrode is a first ratio, and the value range of the first ratio is 0.3-0.5. By improving the relative size of the area of the part of the first electrode exposed by the first opening and the area of the first electrode, the light emitted by the light-emitting device can be more reflected by the first electrode, the proportion of the light emitted by the light-emitting device in the light received by the ambient light sensor is reduced, and the sensing accuracy of the ambient light sensor is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display substrate and a display device. Background Technology

[0002] An ambient light sensor (ALS) can automatically adjust the screen brightness based on the intensity of ambient light, thereby reducing the power consumption of the product. Therefore, it is included in many display devices.

[0003] With the development of the display industry, full-screen displays are becoming increasingly popular. To increase the screen-to-body ratio, structures such as ambient light sensors need to be placed on the back of the display area of ​​the display panel. The display area of ​​the display panel contains multiple sub-pixels with different luminous colors. By controlling the brightness of these sub-pixels, image display is achieved. While the ambient light sensor is detecting the intensity of ambient light, the display panel continues to display an image. Light emitted from some sub-pixels surrounding the ambient light sensor is refracted and reflected within the display panel, passing through gaps between the opaque structures and ultimately illuminating the ambient light sensor. This causes interference from the light signals of the light-emitting devices, reducing the sensor's accuracy. Summary of the Invention

[0004] Embodiments of the present invention provide a display substrate and a display device to reduce the proportion of light emitted by light-emitting devices in the light received by an ambient light sensor, thereby improving the sensing accuracy of the ambient light sensor.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, a display substrate is provided, having a display area, wherein a plurality of sub-pixels are disposed in the display area, the plurality of sub-pixels including at least one first sub-pixel, the first sub-pixel including a first electrode; the display substrate includes a pixel defining layer, the pixel defining layer being located on the side of the first electrode near the light-emitting surface of the display substrate; the pixel defining layer having a first opening, the first opening exposing a portion of the first electrode; the ratio of the area of ​​the portion of the first electrode exposed by the first opening to the area of ​​the first electrode is a first ratio, the first ratio being in the range of 0.3 to 0.5.

[0007] In some embodiments, the orthogonal projection of the edge of the first opening away from the first electrode onto the first electrode coincides with the edge of the first electrode.

[0008] In some embodiments, the plurality of sub-pixels further includes at least one second sub-pixel, the second sub-pixel including a second electrode located on the side of the pixel defining layer away from the light-emitting surface of the display substrate; the pixel defining layer has a second opening that exposes a portion of the second electrode; the ratio of the area of ​​the portion of the second electrode exposed by the second opening to the area of ​​the second electrode is a second ratio, and the first ratio is less than the second ratio.

[0009] In some embodiments, in the first sub-pixel and the second sub-pixel of the same color, the area of ​​the portion of the first electrode exposed by the first opening is less than or equal to the area of ​​the portion of the second electrode exposed by the second opening.

[0010] In some embodiments, the area of ​​the first electrode is larger than the area of ​​the second electrode.

[0011] In some embodiments, the area of ​​the portion of the first electrode exposed by the first opening is 0.5 to 0.9 times the area of ​​the portion of the second electrode exposed by the second opening; and the area of ​​the first electrode is 1.1 to 1.5 times the area of ​​the second electrode.

[0012] In some embodiments, the display substrate further includes a peripheral region located on at least one side of the display area; the display substrate includes a first signal line located on the side of the first electrode away from the light-emitting surface of the display substrate and coupled to the first sub-pixel; the first signal line includes a first signal line segment and a peripheral signal line segment, the first signal line segment being located within the area defined by the first sub-pixel, and the peripheral signal line segment being located within the peripheral region; the width of the first signal line segment is greater than the width of the peripheral signal line segment.

[0013] In some embodiments, the first signal segment overlaps with the edges of two adjacent openings near the light-emitting surface of the display substrate.

[0014] In some embodiments, the width of the first signal segment is 1.05 to 1.3 times the width of the surrounding signal segments.

[0015] In some embodiments, the plurality of sub-pixels further includes at least one second sub-pixel, the second sub-pixel including a second electrode located on the side of the pixel defining layer away from the light-emitting surface of the display substrate; the pixel defining layer has a second opening that exposes a portion of the second electrode, the ratio of the area of ​​the portion of the second electrode exposed by the second opening to the area of ​​the second electrode is a second ratio, and the first ratio is less than the second ratio; the first signal line is also coupled to the second sub-pixel; the first signal line further includes a second signal line segment located within the area defined by the second sub-pixel; the width of the second signal line segment is equal to the width of the peripheral signal line segment.

[0016] In some embodiments, the display substrate includes a hole transport layer located on the side of the pixel electrode near the light-emitting surface of the display substrate; at least one of the sub-pixels has an electron blocking layer located on the side of the hole transport layer away from the pixel electrode; the HOMO energy level of the electron blocking layer is higher than the HOMO energy level of the hole transport layer.

[0017] In some embodiments, the sub-pixel further includes a light-emitting pattern located on the side of the electron blocking layer away from the pixel electrode, the light-emitting pattern being made of a host material and a doped material; the HOMO energy level of the electron blocking layer is higher than the HOMO energy level of the host material.

[0018] In some embodiments, the plurality of sub-pixels emit different colors, and the luminous efficiency of the first sub-pixel is higher than that of the other colored sub-pixels among the plurality of sub-pixels.

[0019] In a second aspect, a display device is provided, comprising a display substrate as described in any embodiment of the first aspect, and further comprising an ambient light sensor disposed on the side of the display substrate opposite to the light-emitting surface.

[0020] In some embodiments, the display area of ​​the display substrate includes a first display area, and a first sub-pixel is located in the first display area; the center of the ambient light sensor is directly opposite the center of the first display area, and the area of ​​the first display area is greater than or equal to 1.1 times the area of ​​the ambient light sensor projected onto the display substrate.

[0021] This invention improves the relative size of the area of ​​the portion of the first electrode exposed by the first opening to the area of ​​the first electrode itself, thereby increasing the area of ​​the first electrode relative to the area of ​​the portion of the first electrode exposed by the first opening. This allows more light emitted by the light-emitting device inside the display substrate to be reflected by the first electrode, reducing the proportion of light emitted by the light-emitting device in the light received by the ambient light sensor, and improving the sensing accuracy of the ambient light sensor. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A structural diagram of a display substrate provided in at least one embodiment of this disclosure;

[0024] Figure 2 Different sub-pixel arrangements are provided for at least one embodiment of this disclosure;

[0025] Figure 3 A cross-sectional view of a display substrate provided for at least one embodiment of this disclosure;

[0026] Figure 4 A partial structural diagram of a display substrate provided for at least one embodiment of this disclosure;

[0027] Figure 5 A normalized brightness curve provided for at least one embodiment of this disclosure;

[0028] Figure 6 A comparison diagram of brightness decay time between a control group and a test group 1 provided for at least one embodiment of this disclosure;

[0029] Figure 7 A minimum normalized brightness comparison diagram of a control group and test group 1 provided for at least one embodiment of this disclosure;

[0030] Figure 8 A comparison diagram of brightness decay time between a control group and a test group 2 provided for at least one embodiment of this disclosure;

[0031] Figure 9 A comparison diagram of minimum normalized brightness between a control group and a test group 2 provided for at least one embodiment of this disclosure;

[0032] Figure 10 A structural diagram of a display substrate provided in at least one embodiment of this disclosure;

[0033] Figure 11 A partial structural diagram of a display substrate provided for at least one embodiment of this disclosure;

[0034] Figure 12 A partial structural diagram of a display substrate provided for at least one embodiment of this disclosure;

[0035] Figure 13 An electron blocking layer material structure provided in at least one embodiment of this disclosure;

[0036] Figure 14 An energy level diagram provided for at least one embodiment of this disclosure;

[0037] Figure 15 Another energy level relationship diagram provided for at least one embodiment of this disclosure;

[0038] Figure 16 Another electron blocking layer material structure provided in at least one embodiment of this disclosure;

[0039] Figure 17 A structural diagram of a display device provided for at least one embodiment of this disclosure;

[0040] Figure 18 Another display device structural diagram provided for at least one embodiment of this disclosure;

[0041] Figure 19 A cross-sectional view of a display device provided for at least one embodiment of this disclosure;

[0042] Figure 20 A top view of a display device provided for at least one embodiment of this disclosure. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0045] Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms, such as the third-person singular "comprises" and the present participle "comprising," are interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0046] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0047] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0048] "Multiple" means at least two.

[0049] The use of “applies to” or “configured to” in this article implies an open and inclusive language that does not preclude applicability to or configuration to devices that perform additional tasks or steps.

[0050] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched regions shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0051] Some embodiments of this disclosure provide a display substrate that can be used to display images. For example, the display substrate can display static images or dynamic images. The display substrate may be an OLED (Organic Light Emitting Diode) substrate. The display substrate has a light-emitting surface; specifically, the surface of the display substrate capable of displaying images and where the displayed images can be observed is the light-emitting surface of the display substrate.

[0052] For example, see Figure 1 The display substrate 10 has a display area AA and a peripheral area S. The peripheral area S is located on at least one side of the display area AA. For example, the peripheral area S may be arranged around the display area AA. The display substrate 10 may also include a plurality of sub-pixels P, which are located in the display area AA. The plurality of sub-pixels P may include a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel. For example, the first color, the second color, and the third color are red, green, and blue, respectively; that is, the plurality of sub-pixels P includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The arrangement of the plurality of sub-pixels is not strictly limited; for example, see [reference needed]. Figure 2 The arrangement of multiple sub-pixel regions P can be Figure 2 The standard RGB layout (also known as sRGB layout) shown in (a) is shown in the image. Figure 2 The Pentile arrangement shown in (b) is as follows: Figure 2 Any of the diamond arrangements shown in (c) above. Where R is a red subpixel, G is a green subpixel, and B is a blue subpixel.

[0053] See Figure 3The display substrate 10 includes a substrate 110, a pixel circuit layer 120, a planarization layer 130, a pixel electrode layer 140, a pixel defining layer 150, a light-emitting functional layer 160, and a common electrode layer 170, all stacked together. The pixel circuit layer 120 is disposed on the substrate 110 and includes a plurality of pixel driving circuits 121. The planarization layer 130 is disposed on the side of the pixel circuit layer 120 away from the substrate 110 and contacts the pixel circuit layer 120; the planarization layer 130 is configured to provide a flat surface. The pixel electrode layer 140 is disposed on the side of the planarization layer 130 away from the substrate 110 and contacts the planarization layer 130; the pixel electrode layer 140 includes a plurality of pixel electrodes 141, each pixel electrode 141 being coupled to a pixel circuit through at least one (e.g., one) via h in the planarization layer 130. A pixel defining layer 150 is disposed on the side of the planarization layer 130 away from the substrate 110 and in contact with the planarization layer 130. The pixel defining layer 150 has multiple openings OP, each opening OP exposing a portion of a pixel electrode 141. A light-emitting functional layer 160 is disposed on the side of the pixel electrode layer 140 and the pixel defining layer 150 away from the substrate 110, and each opening on the pixel defining layer 150 is covered by the light-emitting functional layer 160. A common electrode layer 170 is disposed on the side of the light-emitting functional layer 160 away from the substrate 110 and in contact with the light-emitting functional layer 160. In addition, the display substrate 10 may include other films and structures necessary for realizing the display, which will not be described in detail here.

[0054] The display substrate 10 includes a plurality of light-emitting devices L, each of which is composed of a pixel electrode 141, a light-emitting functional layer 160, and a common electrode layer 170 that are in contact with each other. The polarity of the pixel electrode 141 and the common electrode layer 170 is not subject to excessive restrictions. For example, the pixel electrode 141 can be used as the anode, and the common electrode layer 170 as the cathode. At least one (e.g., each) sub-pixel includes a pixel driving circuit 121 and a light-emitting device L, the pixel driving circuit 121 being coupled to the light-emitting device L and configured to drive the light-emitting device L to emit light.

[0055] For example, see Figure 1 and Figure 3The display substrate 10 includes a plurality of sub-pixels P, each including at least one (e.g., one or more) first sub-pixels P1, a plurality of openings OP, each including at least one (e.g., one or more) first openings OP1, and a plurality of pixel electrodes 141, each including at least one (e.g., one or more) first electrodes 1411. Each first sub-pixel P1 includes a first electrode 1411 and a first opening OP1. The first opening OP1 exposes a portion of the first electrode 1411, specifically, the orthographic projection of the edge of the first opening OP1 near the first electrode onto the substrate is contained within the orthographic projection of the first electrode 1411 onto the substrate. The ratio of the area of ​​the portion of the first electrode 1411 exposed by the first opening OP1 to the area of ​​the first electrode 1411 is a first ratio, the first ratio being in the range of 0.3 to 0.5.

[0056] The division of the first sub-pixel P1 depends only on the first ratio and is independent of the emission color of the sub-pixel P. At least one (e.g., one or more) sub-pixels P in the display substrate 10 can be the first sub-pixel P1. For example, when the display substrate 10 has sub-pixels of red, green, and blue colors, some of the green sub-pixels in the display substrate 10 can be the first sub-pixel P1; or, some of the green sub-pixels and some of the red sub-pixels in the display substrate 10 can be the first sub-pixel P1; or, some of the green sub-pixels, some of the red sub-pixels, and some of the blue sub-pixels in the display substrate 10 can all be the first sub-pixel P1.

[0057] Normally, the area of ​​the pixel electrode exposed by the opening of a sub-pixel is close to the area of ​​the sub-pixel opening region and the area of ​​the pixel electrode, and the ratio of the two is generally in the range of 0.65 to 0.8. However, in this disclosure, the first ratio of the first sub-pixel is only in the range of 0.3 to 0.5. The range of the first ratio in this disclosure can be achieved by the following setting method:

[0058] Method 1, see Figure 4 In (b), the area of ​​the portion of the first electrode 1411 exposed by the first opening OP1 is the same as the area of ​​the portion of the conventional pixel electrode 141 exposed by the opening OP, and the area of ​​the first electrode 1411 is larger than the area of ​​the conventional pixel electrode 141.

[0059] Method 2, see Figure 4 In (c), the area of ​​the first electrode 1411 is the same as the area of ​​the conventional pixel electrode 141, but the area of ​​the portion of the first electrode 1411 exposed by the first opening OP1 is smaller than the area of ​​the portion of the conventional pixel electrode 141 exposed by the opening OP.

[0060] Method 3, see Figure 4In (d), the area of ​​the portion of the first electrode 1411 exposed by the first opening OP1 is smaller than the area of ​​the portion of the conventional pixel electrode 141 exposed by the opening OP, while the area of ​​the first electrode 1411 is larger than the area of ​​the conventional pixel electrode 141.

[0061] Figure 4 The optical path diagrams for different pixel electrode and aperture configurations show the same light-emitting position selected for all configurations. For example, the distance between the light-emitting position and the edge of the aperture OP near pixel electrode 141 is d1, and the distance to pixel electrode 141 itself is d2. (See also...) Figure 4 In (a), when the sub-pixel structure is set to the conventional configuration, the light emitted by the light-emitting device is reflected by the common electrode layer 170 and refracted into the pixel delimiting layer 150, and finally emitted through the gap between the pixel electrodes 141. However, when the sub-pixel structure is configured according to methods 1 to 3 above, the light emitted by the light-emitting device is reflected by the common electrode layer 170 and refracted into the pixel delimiting layer 150, and then illuminates the first electrode 1411 through the pixel delimiting layer 150. It is then reflected by the first electrode 1411 towards the side where the common electrode layer 170 is located, and cannot directly penetrate the display substrate through the gap between the first electrodes 1411. As can be seen, the improvements made in this disclosure to the area of ​​the portion of the first electrode 1411 exposed by the first opening OP1 and the relative size of the area of ​​the first electrode 1411, while ensuring normal display of the display substrate, enable more light emitted by the light-emitting device to be reflected by the first electrode 1411, thereby improving the blocking effect of the first electrode 1411 on the light emitted by the light-emitting device, reducing the transmittance of the display substrate to the light emitted by the light-emitting device, and thus improving the applicability of the display substrate for integration of under-display ambient light sensors.

[0062] For example, see Figure 4 In (b) and (d), when the area of ​​the first electrode 1411 is larger than the area of ​​a conventional pixel electrode, that is, when the area of ​​the first electrode 1411 is increased to improve its reflectivity to the light emitted by the light-emitting device, the first opening OP1 can be set to be away from the edge of the first electrode 1411 and overlap with the edge of the first electrode 1411. In other words, the orthographic projection of the edge of the first opening OP1 away from the first electrode 1411 on the first electrode 1411 coincides with the edge of the first electrode 1411. This ensures that the first electrode 1411 has a high reflectivity to the light emitted by the light-emitting device, while avoiding display abnormalities on the display substrate that may be caused by direct contact between the first electrode 1411 and its surrounding pixel electrodes.

[0063] For example, when a portion of the plurality of sub-pixels of the display substrate 10 is the first sub-pixel P1, see [reference needed]. Figure 1 and Figure 3The plurality of sub-pixels P further includes at least one (e.g., one or more) second sub-pixels P2, the plurality of openings OP further includes at least one (e.g., one or more) second openings OP2, and the plurality of pixel electrodes 141 further includes at least one (e.g., one or more) second electrodes 1412. Each second sub-pixel P2 includes a second electrode 1412 and a second opening OP2, the second opening OP2 exposing a portion of the second electrode 1412. The ratio of the area of ​​the portion of the second electrode 1412 exposed by the second opening OP2 to the area of ​​the second electrode 1412 is a second ratio, and a first ratio is less than the second ratio. That is, the plurality of sub-pixels P in the display substrate 10 can be divided into first sub-pixels P1 and second sub-pixels P2, and the first sub-pixels P1 and the second sub-pixels P2 have different structural configurations. Similar to the first sub-pixels P1, the division of the second sub-pixels P2 is only related to the second ratio and is not related to the emission color of the sub-pixels P. For example, the structure of the first sub-pixel P1 can be configured according to methods 1 to 3 described above, while the structure of the second sub-pixel P2 is configured conventionally. In this case, the value range of the first ratio is only 0.3 to 0.5, and the value range of the second ratio is 0.65 to 0.8. Under this configuration, due to the presence of the first sub-pixel P1 in the display substrate 10, the transmittance of the display substrate 10 to the light emitted by the light-emitting device L will also be reduced.

[0064] For example, when multiple sub-pixels P include multiple (e.g., two or more) first sub-pixels P1, and the colors of the multiple first sub-pixels P1 are different, in order to more reasonably improve the structure of the first sub-pixels P1 with different colors, the area of ​​the portion of the first electrode 1411 exposed by the first opening OP1 in the first sub-pixels P1 and the second sub-pixels P2 with the same color can be set to be less than or equal to the area of ​​the portion of the second electrode 1412 exposed by the second opening OP2.

[0065] Specifically, for first sub-pixels P1 and second sub-pixels P2 of the same color, the following settings can be made: the area of ​​the portion of the first electrode 1411 exposed by the first opening OP1 (hereinafter referred to as the first effective light-emitting area) is equal to the area of ​​the portion of the second electrode 1412 exposed by the second opening OP2 (hereinafter referred to as the second effective light-emitting area); the area of ​​the first electrode 1411 is larger than the area of ​​the second electrode 1412; the first effective light-emitting area is smaller than the second effective light-emitting area, and the area of ​​the first electrode 1411 is equal to the area of ​​the second electrode 1412; the first effective light-emitting area is smaller than the second effective light-emitting area, and the area of ​​the first electrode 1411 is larger than the area of ​​the second electrode 1412. The structures of multiple first sub-pixels P1 of the same color can be the same or different, and this disclosure does not impose many restrictions on this.

[0066] The aperture ratio of a subpixel refers to the ratio of its effective light-emitting area to the total area of ​​the subpixel. A smaller effective light-emitting area results in a smaller aperture ratio and lower brightness. The effective light-emitting area of ​​a subpixel is the area of ​​the portion of the pixel electrode exposed by the aperture. In this disclosure, the first effective light-emitting area of ​​the first subpixel is set to be no greater than the second effective light-emitting area of ​​a second subpixel of the same color. This does not increase the brightness of the first subpixel, and correspondingly, it does not increase the transmittance of the display substrate to the light emitted by the light-emitting device. Under this premise, the first effective light-emitting area is smaller than the area of ​​the first electrode, further improving the blocking effect of the first electrode on the light emitted by the light-emitting device.

[0067] Furthermore, the capacitance of the light-emitting device is C = εs / d, where ε is the dielectric constant of the medium (i.e., the light-emitting functional layer) between the pixel electrode and the common electrode layer, s is the area of ​​the portion of the pixel electrode exposed by the opening (i.e., the effective light-emitting area), and d is the distance between the pixel electrode and the common electrode layer. Therefore, when the first effective light-emitting area of ​​the first sub-pixel decreases, the capacitance of the light-emitting device decreases, the charging and discharging time required by the light-emitting device decreases, and when the first sub-pixel transitions from the light-emitting stage (in which the sub-pixel emits light normally) to the non-light-emitting stage (in which the sub-pixel theoretically does not emit light), the light-emitting device can be turned off more quickly. Compared to a larger capacitance of the light-emitting device, the above situation can be equivalent to fewer sub-pixels emitting light per unit time in the display substrate, less light emitted by the sub-pixels in the display substrate, and consequently less light passing through the display substrate. When an ambient light sensor is provided on the side away from the display surface of the display substrate, the sensing accuracy of the ambient light sensor is improved.

[0068] For example, for a first sub-pixel and a second sub-pixel of the same color, when the first effective light-emitting area is smaller than the second effective light-emitting area, and the area of ​​the first electrode is larger than the area of ​​the second electrode, the area of ​​the portion of the first electrode exposed by the first opening can be further set to be 0.5 to 0.9 times the area of ​​the portion of the second electrode exposed by the second opening, and the area of ​​the first electrode can be 1.1 to 1.5 times the area of ​​the second electrode. This ensures that the first sub-pixel can emit light and display normally while significantly improving the blocking effect of the first electrode on the light emitted by the light-emitting device.

[0069] To verify the improvement effect of reducing the effective light-emitting area and increasing the pixel electrode area as described above, the following tests were conducted. Except for the effective light-emitting area and the pixel electrode area, all other parameters of the display substrates of the test group and the control group were the same.

[0070] Control group: The effective luminescent area of ​​the sub-pixel is 442μm. 2 The pixel electrode area is 532μm. 2 .

[0071] Test group 1: The effective luminous area of ​​the subpixel is 353μm. 2 The pixel electrode area is 532μm. 2 Compared to the control group, the effective luminescent area was reduced.

[0072] Test group 2: The effective luminous area of ​​the subpixel is 442μm. 2 The pixel electrode area is 580μm. 2 Compared to the control group, the pixel electrode area is increased.

[0073] Test Procedure: A photomultiplier tube (PMT) was used to replace the original ambient light sensor. A row of sub-pixels was turned on and off at a fixed frequency. The normalized brightness (i.e., 100% * real-time brightness / maximum brightness) of the sub-pixels in that row was detected. The brightness decay time FT (the time required for the normalized brightness to decrease from stable emission to 10%) and the minimum normalized brightness min were obtained for that row of sub-pixels. The brightness decay time of the control group was recorded as FT1, and the minimum normalized brightness was recorded as min1.

[0074] Test results:

[0075] The normalized brightness curve of the control group is as follows: Figure 5 As shown, Figure 5 The vertical axis represents normalized brightness, and the horizontal axis represents time. The brightness decay time FT1 of the control group is 100 μs, and the minimum normalized brightness min1 is 3%.

[0076] The comparison results of brightness decay time between the control group and test group 1 are as follows: Figure 6 As shown, Figure 6 The vertical axis represents the normalized value of brightness decay time relative to the control group. The minimum normalized brightness comparison results are shown below. Figure 7 As shown, Figure 7 The ordinate in the graph represents the normalized value of the minimum normalized brightness relative to the control group. Figures 6-7 It can be seen that, compared with the control group, the brightness decay time and minimum normalized brightness of test group 1, which has a reduced effective luminous area, are both reduced.

[0077] The comparison results of brightness decay time between the control group and test group 2 are as follows: Figure 8 As shown, Figure 8 The vertical axis represents the normalized value of brightness decay time relative to the control group. The minimum normalized brightness comparison results are shown below. Figure 9 As shown, Figure 9 The ordinate in the graph represents the normalized value of the minimum normalized brightness relative to the control group. Figures 8-9 As can be seen, compared with the control group, the brightness decay time and minimum normalized brightness of test group 2, which has an increased pixel electrode area, are both reduced.

[0078] Results Analysis: When a sub-pixel transitions from the emitting stage to the non-emitting stage, a shorter brightness decay time results in a faster sub-pixel extinguishing. Consequently, the amount of light emitted by the sub-pixel during the non-emitting stage is smaller. As a result, the proportion of light emitted by the sub-pixel in the light received by the photomultiplier tube (i.e., the ambient light sensor) decreases, while the proportion of ambient light increases, thus improving the accuracy of ambient light sensing. A smaller minimum normalized brightness results in a smaller final brightness after the sub-pixel extinguishes. During the non-emitting stage, the proportion of light emitted by the sub-pixel in the light received by the photomultiplier tube is also smaller, further improving the accuracy of ambient light sensing. Combined with... Figures 5-9 It is evident that the sub-pixel structure configuration disclosed herein is beneficial for improving the accuracy of ambient light sensing.

[0079] The display substrate may also include multiple signal lines, which are opaque metal lines. These signal lines are disposed in the pixel circuit layer on the side of the multiple pixel electrodes away from the light-emitting surface of the display substrate. Each signal line is coupled to multiple sub-pixels and is configured to provide corresponding driving signals to the pixel driving circuit of the sub-pixel coupled to it. For example, the multiple signal lines can be gate lines, data lines, power supply voltage lines (not shown in the figure), etc.

[0080] For example, see Figure 10 The multiple signal lines include at least one (e.g., one or more) first signal lines SL1, each first signal line SL1 being coupled to at least one (e.g., one or more) first sub-pixels P1. Each first signal line SL1 includes at least one (e.g., one or more) first signal line segments LP1 and at least one (e.g., one or more) peripheral signal line segments SLP. Each first signal line segment LP1 is located within a region defined by a first sub-pixel P1, and each peripheral signal line segment SLP is located within a peripheral region. That is, the portion of the first signal line SL1 located within the region defined by a first sub-pixel P1 constitutes a first signal line segment LP1; the portion of the first signal line SL1 located within the peripheral region S constitutes a peripheral signal line segment SLP. The dimension of the first signal line segment LP1 is its width, perpendicular to its extension direction; the dimension of the peripheral signal line segment SLP is its width, perpendicular to its extension direction. The width of the first signal line segment LP1 is greater than the width of the peripheral signal line segment SLP. For example, the width of the peripheral signal line segment SLP can be designed with reference to the signal line width of a conventional display substrate. The width of the part of the first signal line SL1 other than the peripheral signal line segment SLP and the first signal line segment LP1 can be equal to the width of the peripheral signal line segment SLP. The first signal line segment LP1 is obtained by locally widening the first signal line SL1.

[0081] The distribution range of the first signal line segment LP1 is related to the first sub-pixel P1. For example, when multiple sub-pixels are all first sub-pixels P1, each of the first signal lines SL1 includes the first signal line segment LP1 and the peripheral signal line segment SLP, and the first signal line segment LP1 is distributed throughout the entire display area AA. For another example, when some of the multiple sub-pixels are first sub-pixels P1, the multiple sub-pixels in the display substrate 10 are divided into first sub-pixels P1 and second sub-pixels P2, and at least one (e.g., one or more) first signal line SL1 is coupled to at least one (e.g., one or more) first sub-pixels P1 and at least one (e.g., one or more) second sub-pixels P2. In addition to the first signal line segment LP1 and the peripheral signal line segment SLP, the first signal line SL1 also includes at least one (e.g., one or more) second signal line segment LP2, and each second signal line segment LP2 is located within the area defined by a second sub-pixel P2. At this time, the width of the second signal segment LP2 is equal to the width of the surrounding signal segment SLP, and the width of the first signal segment LP1 is greater than the width of the surrounding signal segment SLP, and also greater than the width of the second signal segment LP2.

[0082] When the light emitted by the light-emitting device passes through the gap between two adjacent pixel electrodes and illuminates the pixel circuit layer, the first signal line segment LP1, which is wider than other parts of the first signal line SL1, can reflect more light towards the side where the light-emitting device is located, reducing the amount of light passing through the pixel circuit layer, thereby reducing the transmittance of the display substrate 10 to the light emitted by the light-emitting device.

[0083] For example, at least one (e.g., one or more) first signal line segments overlap with the edges of two adjacent openings near the light-emitting surface of the display substrate. Specifically, the two adjacent openings may include a first opening and a second opening, or as shown below. Figure 11 As shown, the two adjacent openings are both the first opening OP1, and the edge of the first opening OP1 near the light-emitting surface of the display substrate is the first opening edge OP1'. Figure 11 The orthographic projection of each first opening edge OP1' onto the first electrode 1411 opposite it coincides with the edge of the first electrode 1411. Therefore, when the first signal segment LP1 overlaps with both first opening edges OP1', the first signal segment LP1 also overlaps with the two adjacent first electrodes 1411. Regardless of whether the two adjacent openings include two first openings or one first opening and one second opening, the above arrangement can maximize the distribution range of the first signal segment in the area between the two pixel electrodes, thereby maximizing the degree to which the first signal segment blocks the gap between the two pixel electrodes, and thus reducing the transmittance of the display substrate to the light emitted by the sub-pixels.

[0084] For example, the width of the first signal segment LP1 can be 1.05 to 1.3 times the width of the surrounding signal segment SLP. This ensures that the width of the first signal segment LP1 in the first signal line SL1 is increased within a reasonable range while improving the reflectivity of the light emitted by the light-emitting device, thus avoiding short circuit problems that may be caused by an excessively large width of the first signal segment LP1.

[0085] See Figure 12 The light-emitting functional layer 160 may include an emitting material layer (EML), a hole transport layer (HTL), and an electron transport layer (ETL). The hole transport layer (HTL) is located on the side of the pixel electrode 141 closest to the light-emitting surface of the display substrate 10, the emitting material layer (EML) is located on the side of the hole transport layer (HTL) furthest from the pixel electrode 141, and the electron transport layer (ETL) is located on the side of the emitting material layer (EML) furthest from the hole transport layer (HTL). Furthermore, a hole injection layer (HIL) may be provided between the hole transport layer (HTL) and the pixel electrode 141 (i.e., the anode), and an electron injection layer (EIL) may be provided between the electron transport layer (ETL) and the common electrode layer 170, as needed. The emitting material layer (EML) includes multiple light-emitting patterns (EMPs), with one light-emitting pattern (EMP) disposed in each opening on the pixel defining layer 150, and each light-emitting pattern (EMP) contained within a sub-pixel.

[0086] The hole transport layer (HTL) can be formed using allylamine-based materials, while the electron transport layer (ETL) can be formed using various metal complexes, triazole derivatives, imidazole derivatives, and other materials. The electron injection layer (EIL) can be formed using lithium salts, cesium salts, and other materials, while the hole injection layer (HIL) can be formed using allylamine-based materials, peptide cyanine-based materials, and other materials. The emissive layer (EML) consists of a host material and a dopant material. The host material has relatively low luminescence efficiency but good film-forming properties, while the dopant material has relatively high luminescence efficiency but poor film-forming properties.

[0087] See Figure 12At least one (e.g., each) sub-pixel has an electron blocking layer (EBL) located on the side of the hole transport layer (HTL) away from the pixel electrode 141. The EBL in the sub-pixel is in contact with both the hole transport layer (HTL) and the light-emitting pattern (EMP) within that sub-pixel. The HOMO energy level of the EBL is lower than that of the hole transport layer (HTL). The HOMO energy level is the highest occupied molecular orbital (HOMO). Commonly used materials for forming the EBL include carbazole compounds, organic amines, and butadiene compounds. For example, the EBL material can be N,N,N',N'-tetraphenylbenzidine with the molecular formula C2. 60 H 44 N2, its molecular structure is as follows Figure 13 As shown.

[0088] See Figure 14 When the HOMO level of the electron blocking layer (EBL) is lower than that of the hole transport layer (HTL), the HOMO level of the EBL is deeper. This deeper HOMO level hinders hole escape. Furthermore, the presence of the energy level gap between the EBL and HTL leads to hole accumulation near their interface. When a sub-pixel transitions from a light-emitting phase (where it emits light normally) to a non-light-emitting phase (where it theoretically does not emit light), the holes accumulated near the interface enter the light-emitting pattern (EMP) through thermal injection or tunneling. Carrier recombination occurs within the EMP, causing the sub-pixel to continue emitting light for a certain period even after transitioning to the non-light-emitting phase. Furthermore, when a sub-pixel is in the light-emitting phase, holes accumulated near the contact interface diffuse to the surrounding area via the hole transport layer (HTL). When these holes travel to the area of ​​a sub-pixel in the non-light-emitting phase, they may enter the light-emitting pattern (EMP) of the non-light-emitting sub-pixel through thermal injection or tunneling, causing the sub-pixel to emit light. This can be equivalent to an increase in the number of light-emitting sub-pixels in the display substrate per unit time, leading to an increase in the amount of light emitted by the sub-pixels and consequently an increase in the amount of light passing through the display substrate. When an ambient light sensor is located on the side furthest from the display surface of the display substrate, the sensing accuracy of the ambient light sensor decreases.

[0089] Therefore, for example, see Figure 15The HOMO level of the electron blocking layer (EBL) can be set higher than that of the hole transport layer (HTL). The shallower HOMO level of the EBL results in higher hole mobility, reducing the number of holes accumulated near the interface between the two layers. This allows for faster depletion of accumulated holes when a sub-pixel transitions from the emission phase to the non-emission phase, shortening the emission duration of the sub-pixel during the non-emission phase. Simultaneously, fewer holes are transported to the surrounding area, reducing the probability of emission from surrounding non-emission sub-pixels, thus mitigating the aforementioned problems.

[0090] For example, see Figure 15 Furthermore, the HOMO level of the electron blocking layer EBL can be set higher than the HOMO level of the host material HM of the emissive layer EML (the doped material of the emissive layer EML is shown as DM). By setting the HOMO level relationship between the electron blocking layer EBL and the host material, the energy levels of the two can be matched, reducing the energy level gap and thus reducing hole accumulation caused by the energy level gap.

[0091] For example, the electron blocking layer can be a composite material with an organic amine as the main body and carbazole as the ligand. For instance, a composite material with monoaniline as the main body and carbazole as the ligand can be used, or a composite material with dianiline as the main body and carbazole as the ligand can be used, or a composite material with... Figure 16 The material with the structure shown is an electron blocking layer. Compared to conventional electron blocking layer materials, the electron blocking layer material selected in this disclosure has improved electron-donating ability and a higher HOMO energy level. This results in the electron blocking layer having a HOMO energy level higher than that of the hole transport layer and the host material of the light-emitting layer, which is beneficial for hole transport and reduces the accumulation of holes near the contact interface.

[0092] Specifically, the HOMO energy level of the electron blocking layer of only a portion (e.g., one or more) of the sub-pixels in the display substrate can be set to be higher than the HOMO energy level of the hole transport layer and the HOMO energy level of the host material of the light-emitting layer. The energy level matching relationship of the light-emitting functional layer of this portion of the sub-pixels is as follows: Figure 15 As shown, the color of this sub-pixel is not subject to excessive restrictions, and the light-emitting functional layer of other sub-pixels in the display substrate adopts... Figure 14 The above illustrates the standard energy level matching relationship. Alternatively, the light-emitting functional layers of all sub-pixels in the display substrate can be configured according to the aforementioned settings, with the energy level matching relationship of the light-emitting functional layers as shown below. Figure 15 As shown.

[0093] See Figure 11The light-emitting functional layer 160 may also include a hole blocking layer HBL, which is located on the side of the electron transport layer ETL away from the common electrode layer 170 and is in contact with the electron transport layer ETL. The hole blocking layer HBL may be formed using materials such as phenanthroline derivatives, metal complexes of hydroxyquinoline derivatives, and various rare earth complexes.

[0094] For example, the luminous efficiency of the first sub-pixel is higher than that of other color sub-pixels among the plurality of sub-pixels. For instance, when the display substrate has sub-pixels of three colors—red, green, and blue—the green sub-pixel has the highest luminous efficiency. Therefore, at least one (e.g., one or more) green sub-pixels are the first sub-pixels, and the other sub-pixels of the display substrate are the second sub-pixels. In this case, the first ratio, the area of ​​the first opening region, the area of ​​the first electrode, the width of the first signal segment, the HOMO energy level of the electron blocking layer of the first sub-pixel, and the second ratio, the area of ​​the second opening region, the area of ​​the second electrode, the width of the second signal segment, and the energy level of the electron blocking layer of the second sub-pixel, all related to the first and second sub-pixels, can be set with reference to any of the foregoing embodiments. Different colored sub-pixels have different luminous efficiencies, and under the same conditions, the luminous brightness of different colored sub-pixels also differs. The higher the luminous efficiency, the greater the luminous brightness, and the greater the transmittance of the display substrate to the light emitted by the sub-pixel with higher luminous efficiency. When an ambient light sensor is provided on the side away from the light-emitting surface of the display substrate, the light emitted by the sub-pixel with higher luminous efficiency has a greater impact on the sensing accuracy of the ambient light sensor. When the luminous efficiency of the first sub-pixel is higher than that of other color sub-pixels among the multiple sub-pixels, the first sub-pixel is configured according to any of the foregoing embodiments, which can improve the reflectivity of the light emitted by the light-emitting device of the first sub-pixel to the first electrode and the first signal line segment, and avoid the accumulation of holes in the light-emitting functional layer of the first sub-pixel near the contact interface. Compared with improving other color sub-pixels, improving the first sub-pixel can significantly reduce the transmittance of the display substrate to the light emitted by the light-emitting device.

[0095] Other embodiments of this disclosure provide a display device comprising any of the display substrates described above. The display device may be: a monitor, television, billboard, digital photo frame, laser printer with display function, telephone, mobile phone, personal digital assistant (PDA), digital camera, portable camcorder, viewfinder, navigator, vehicle, large-area wall display, home appliance, information query device (such as business query devices for e-government, banks, hospitals, power companies, etc.).

[0096] For example, the display device further includes an ambient light sensor, which is disposed on the side of the display substrate away from the light-emitting surface. That is, the ambient light sensor is an under-screen ambient light sensor, and the ambient light sensor can be a phototransistor. Figure 17 This is a solution for placing the ambient light sensor in the periphery of the display substrate. Figure 18 The proposed under-display ambient light sensor setup reduces the number of components needed in the surrounding area, thus improving the screen-to-body ratio of the display substrate. For example, see... Figure 19 The display device 1 may include a motherboard 20 (Printed Circuit Board, PCB), which is disposed on the side of the display substrate 10 away from the light-emitting surface and is coupled to the display substrate 10. An ambient light sensor 30 is disposed on the motherboard 20 and coupled to the display substrate 10 through the motherboard 20. Specifically, the ambient light sensor 30 is disposed on the side of the motherboard 20 closer to the display substrate 10. Because the display substrate 10 has low transmittance for light emitted by the light-emitting device, the ambient light sensor 30 is less affected by interference from the light emitted by the light-emitting device, thus improving the sensing accuracy.

[0097] For example, see Figure 20 The display area AA of the display substrate 10 includes a first display area AA1, and all first sub-pixels P1 are located in the first display area AA1. The ambient light sensor 30 is directly opposite the first display area AA1, and the area of ​​the first display area AA1 is larger than the area of ​​the orthographic projection of the ambient light sensor 30 onto the display substrate 10. Specifically, when the display substrate 10 has multiple first sub-pixels, the area defined by the lines connecting the outlines of the multiple first sub-pixels is the first display area AA1. The area of ​​the first display area AA1 is less than or equal to the area of ​​the display area. The ambient light sensor 30 being directly opposite the first display area AA1 means that the orthographic projection of the ambient light sensor 30 onto the display substrate 10 falls within the area defined by the first display area AA1. This can be because there is a gap between the edge of the orthographic projection of the ambient light sensor 30 onto the display substrate 10 and the edge of the first display area AA1 at all points, or the edge of the orthographic projection of the ambient light sensor 30 onto the display substrate 10 and the edge of the first display area AA1 at least partially (e.g., partially or completely) coincides.

[0098] Due to the presence of the first sub-pixel, the transmittance of the first display area AA1 to the light emitted by the light-emitting device is lower than that of other parts of the display area. Therefore, placing the ambient light sensor 30 in the first display area AA1, which has lower transmittance, is beneficial to further improving the sensing accuracy of the ambient light sensor 30.

[0099] For example, the area of ​​the first display area AA1 is not less than 1.1 times the area of ​​the ambient light sensor 30 projected onto the display substrate 10. For instance, the area of ​​the first display area AA1 can be 1.1 times, 1.3 times, 1.6 times, or 2 times the area of ​​the ambient light sensor 30 projected onto the display substrate 10. This ensures that the area of ​​the first display area AA1 is larger than the area of ​​the ambient light sensor 30 projected onto the display substrate 10, resulting in lower light signal transmittance of the light-emitting devices in the surrounding area of ​​the ambient light sensor 30, thus improving the sensing accuracy of the ambient light sensor 30.

[0100] For example, the center of the ambient light sensor 30 is directly opposite the center of the first display area AA1. In this case, there is a gap between the edge of the ambient light sensor 30 projected onto the display substrate 10 and the edge of the first display area AA1 at all points, and the ambient light sensor 30 is completely covered by the portion of the display substrate 10 defined by the first display area AA1. In the thickness direction perpendicular to the display substrate 10, the light signal transmittance of the light-emitting devices in each area around the ambient light sensor 30 is relatively low, further improving the sensing accuracy of the ambient light sensor 30.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display substrate having a display area, wherein a plurality of sub-pixels are disposed in the display area, characterized in that, The plurality of sub-pixels includes at least one first sub-pixel, the first sub-pixel including a first electrode; The display substrate includes a pixel defining layer and a first signal line. The pixel defining layer is located on the side of the first electrode close to the light-emitting surface of the display substrate. The first signal line includes a first signal line segment, which overlaps with two adjacent first electrodes. The first signal line is located on the side of the first electrode away from the light-emitting surface of the display substrate and is coupled to the first sub-pixel. The pixel defining layer has a first opening that exposes a portion of the first electrode; The ratio of the area of ​​the portion of the first electrode exposed by the first opening to the area of ​​the first electrode is a first ratio, and the value of the first ratio ranges from 0.3 to 0.

5.

2. The display substrate according to claim 1, characterized in that, The orthogonal projection of the edge of the first opening away from the first electrode onto the first electrode coincides with the edge of the first electrode.

3. The display substrate according to claim 1, characterized in that, The plurality of sub-pixels also includes at least one second sub-pixel, the second sub-pixel including a second electrode, the second electrode being located on the side of the pixel defining layer away from the light-emitting surface of the display substrate; The pixel defining layer has a second opening that exposes a portion of the second electrode; The ratio of the area of ​​the portion of the second electrode exposed by the second opening to the area of ​​the second electrode is a second ratio, and the first ratio is less than the second ratio.

4. The display substrate according to claim 3, characterized in that, In the first sub-pixel and the second sub-pixel of the same color, the area of ​​the portion of the first electrode exposed by the first opening is less than or equal to the area of ​​the portion of the second electrode exposed by the second opening.

5. The display substrate according to claim 4, characterized in that, The area of ​​the first electrode is larger than the area of ​​the second electrode.

6. The display substrate according to claim 5, characterized in that, The area of ​​the portion of the first electrode exposed by the first opening is 0.5 to 0.9 times the area of ​​the portion of the second electrode exposed by the second opening; The area of ​​the first electrode is 1.1 to 1.5 times the area of ​​the second electrode.

7. The display substrate according to claim 1, characterized in that, The display substrate further has a peripheral region, which is located on at least one side of the display region; The first signal line includes a peripheral signal line segment, which is located within the area defined by the first sub-pixel. The peripheral signal line segment is located within the peripheral area. The width of the first signal segment is greater than the width of the surrounding signal segments.

8. The display substrate according to claim 7, characterized in that, The width of the first signal line segment is 1.05 to 1.3 times the width of the surrounding signal line segments.

9. The display substrate according to claim 7, characterized in that, The plurality of sub-pixels also includes at least one second sub-pixel, the second sub-pixel including a second electrode, the second electrode being located on the side of the pixel defining layer away from the light-emitting surface of the display substrate; The pixel defining layer has a second opening that exposes a portion of the second electrode. The ratio of the area of ​​the portion of the second electrode exposed by the second opening to the area of ​​the second electrode is a second ratio, and the first ratio is less than the second ratio. The first signal line is also coupled to the second sub-pixel; The first signal line further includes a second signal line segment, which is located within the area defined by the second sub-pixel; The width of the second signal segment is equal to the width of the surrounding signal segments.

10. The display substrate according to claim 1, characterized in that, The display substrate includes a hole transport layer, which is located on the side of the first electrode near the light-emitting surface of the display substrate. At least one of the sub-pixels has an electron blocking layer located on the side of the hole transport layer away from the first electrode; The HOMO energy level of the electron blocking layer is higher than the HOMO energy level of the hole transport layer.

11. The display substrate according to claim 10, characterized in that, The sub-pixel also includes a light-emitting pattern, which is located on the side of the electron blocking layer away from the first electrode, and the material of the light-emitting pattern includes a host material and a dopant material; The HOMO energy level of the electron blocking layer is higher than that of the host material.

12. The display substrate according to claim 1, characterized in that, The plurality of sub-pixels emit different colors, and the luminous efficiency of the first sub-pixel is higher than that of the other colored sub-pixels among the plurality of sub-pixels.

13. A display device comprising a display substrate as described in any one of claims 1 to 12, characterized in that, Also includes: An ambient light sensor is disposed on the side of the display substrate away from the light-emitting surface.

14. The display device according to claim 13, characterized in that, The display substrate includes a first display area, and a first sub-pixel is located in the first display area; The center of the ambient light sensor is directly opposite the center of the first display area, and the area of ​​the first display area is greater than or equal to 1.1 times the area of ​​the ambient light sensor projected onto the display substrate.

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