Display substrate and display device

Abstract

A display substrate and a display device, which relate to, but are not limited to, the technical field of display. The display substrate comprises a first optical auxiliary layer (11) and a second optical auxiliary layer (12) that are arranged on a substrate (101), wherein the second optical auxiliary layer (12) is located on the side of a light-emitting layer (322) close to the substrate (101), and the first optical auxiliary layer (11) is located on the side of the second optical auxiliary layer (12) close to the substrate (101); light emitted by the light-emitting layer (322) sequentially passes through the first optical auxiliary layer (11) and the second optical auxiliary layer (12) and is emitted from the substrate (101); the second optical auxiliary layer (12) is configured to converge incident light and emit the converged light to the first optical auxiliary layer (11); and the first optical auxiliary layer (11) is configured to convert the incident converged light into collimated light for emission.

Description

Display substrate and display device

[0001] The present application claims priority to the Chinese patent application No. 202410658005.7, filed on May 24, 2024, and entitled "Display substrate and display device", the content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of display, in particular to a display substrate and a display device. BACKGROUND

[0003] Organic Light Emitting Diode (OLED) and Quantum-dot Light Emitting Diodes (QLED) are active light-emitting display devices, which have the advantages of self-emission, wide viewing angle, high contrast, low power consumption, extremely high response speed, thinness, flexibility, low cost, etc. With the continuous development of display technology, flexible display devices using OLED or QLED as light-emitting devices and controlled by Thin Film Transistor (TFT) have become the mainstream products in the current display field. SUMMARY

[0004] The present application provides a display substrate, comprising a sub-pixel region and a non-sub-pixel region located on the side of the sub-pixel region; the display substrate comprises a driving circuit layer arranged on a substrate, and a light-emitting structure layer arranged on the side of the driving circuit layer away from the substrate;

[0005] The light-emitting structure layer comprises at least a first electrode, a light-emitting layer and a second electrode arranged in sequence along the direction away from the substrate;

[0006] The display substrate further comprises a first optical auxiliary layer and a second optical auxiliary layer arranged on the substrate, the second optical auxiliary layer is located on the side of the light-emitting layer close to the substrate, and the first optical auxiliary layer is located on the side of the second optical auxiliary layer close to the substrate;

[0007] The light emitted by the light-emitting layer passes through the first optical auxiliary layer and the second optical auxiliary layer in sequence and is emitted from the substrate, the second optical auxiliary layer is configured to converge the incident light and emit the converged light towards the direction of the first optical auxiliary layer; the first optical auxiliary layer is configured to convert the incident converged light into collimated light.

[0008] In some example embodiments, the second optical auxiliary layer is disposed in the light-emitting structure layer.

[0009] In some example embodiments, the light-emitting structure layer further comprises a hole transport layer disposed on a side of the light-emitting layer close to the first electrode, the second optical auxiliary layer is disposed between the hole transport layer and the first electrode, and a surface of the second optical auxiliary layer close to the substrate is in contact with the first electrode.

[0010] In some example embodiments, the second optical auxiliary layer comprises a second substrate and a plurality of second metasurface patterns disposed on the second substrate in an array, the second metasurface patterns are disposed on a surface of the second substrate close to the substrate, the second metasurface patterns protrude from the surface of the second substrate, and the second metasurface patterns are configured to converge incident light rays and emit the light rays toward the first optical auxiliary layer.

[0011] In some example embodiments, the second metasurface patterns have a light transmittance of greater than 90% for visible light.

[0012] In some example embodiments, the second metasurface patterns can comprise at least one of silicon, silicon dioxide, and silicon nitride.

[0013] In some example embodiments, a shape of a normal projection of the second metasurface patterns on the substrate comprises at least one of a zigzag shape, a wavy shape, and a polygonal shape.

[0014] In some example embodiments, a length of the second metasurface patterns in a first direction is greater than or equal to 300 nm and less than or equal to 500 nm, a length of the second metasurface patterns in a second direction is greater than or equal to 100 nm and less than or equal to 500 nm, a height of the second metasurface patterns is greater than or equal to 200 nm and less than or equal to 500 nm, the first direction and the second direction are both parallel to the substrate, and the first direction and the second direction intersect each other.

[0015] In some example embodiments, a phase front distribution of the light rays emitted by the second optical auxiliary layer satisfies the following formula:

[0016] wherein (x2, y2) is a distance from an arbitrary position in the second metasurface pattern array to a center point of the second metasurface pattern array, f2 is a focal length of a lens formed by the second metasurface pattern array, λ2 is a wavelength of the light rays incident on the second metasurface pattern array, and φ2 is the phase front distribution of the light rays emitted by the second optical auxiliary layer.

[0017] In some example embodiments, the first optical auxiliary layer is disposed on the side of the driving circuit layer close to the substrate, and a surface of the first optical auxiliary layer close to the substrate is in contact with the substrate.

[0018] In some example embodiments, the first optical auxiliary layer comprises a first substrate and a plurality of first metasurface patterns disposed on the first substrate in an array, the first metasurface patterns are disposed on a surface of the first substrate close to the substrate, the first metasurface patterns protrude from the surface of the first substrate, and the first metasurface patterns are configured to collimate incident light rays and emit the light rays toward the substrate.

[0019] In some example embodiments, the first metasurface patterns have a light transmittance of greater than 90% for visible light.

[0020] In some example embodiments, the first metasurface patterns can comprise at least one of silicon, silicon dioxide, and silicon nitride.

[0021] In some example embodiments, a shape of a normal projection of the first metasurface patterns on the substrate comprises at least one of a zigzag shape, a wavy shape, and a polygonal shape.

[0022] In some example embodiments, a length of the first metasurface patterns in a first direction is greater than or equal to 300 nm and less than or equal to 500 nm, a length of the first metasurface patterns in a second direction is greater than or equal to 100 nm and less than or equal to 500 nm, a height of the first metasurface patterns is greater than or equal to 200 nm and less than or equal to 500 nm, the first direction and the second direction are both parallel to the substrate, and the first direction and the second direction intersect each other.

[0023] In some example embodiments, a phase front distribution of the light rays emitted by the first optical auxiliary layer satisfies the following formula:

[0024] wherein (x1, y1) is a distance from an arbitrary position in the first metasurface pattern array to a center point of the first metasurface pattern array, f1 is a focal length of a lens formed by the first metasurface pattern array, λ1 is a wavelength of the light rays incident on the first metasurface pattern array, and φ1 is the phase front distribution of the light rays emitted by the first optical auxiliary layer.

[0025] In some example embodiments, a first dielectric layer is further included, and the first dielectric layer is disposed on a side of the first optical auxiliary layer away from the substrate and in contact with the first optical auxiliary layer.

[0026] In some example embodiments, a second dielectric layer is further included, and the second dielectric layer is disposed on a side of the second optical auxiliary layer away from the substrate and in contact with the second optical auxiliary layer.

[0027] In some example embodiments, a third optical auxiliary layer is further included, which is disposed on the side of the light-emitting layer close to the second electrode, and is configured to reflect the incident light towards the substrate.

[0028] In some example embodiments, the light reflected by the third optical auxiliary layer is substantially parallel to the light incident on the third optical auxiliary layer.

[0029] In some example embodiments, the third optical auxiliary layer includes at least one reflection pattern located in the sub-pixel region, which includes a plurality of microstructures arranged in an array and protruding towards the second electrode, and a reflection layer covering the surfaces of the microstructures away from the substrate.

[0030] In some example embodiments, the reflection layer has a reflectivity of visible light greater than or equal to 98%.

[0031] In some example embodiments, the microstructures are three-sided right-angle prisms.

[0032] The present disclosure also provides a display device, which includes any of the display substrates described above.

[0033] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. Other advantages of the present application will be realized and attained by the methods particularly pointed out in the written description and claims hereof.

[0034] SUMMARY

[0035] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate embodiments of the present application, and are used to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0036] FIG. 1 is a structural schematic diagram of a display device;

[0037] FIG. 2 is a structural schematic diagram of a display substrate according to an embodiment of the present application;

[0038] FIG. 3 is a cross-sectional structural schematic diagram of a display region of a display substrate according to an embodiment of the present disclosure;

[0039] FIG. 4 is a light path schematic diagram of a first optical auxiliary layer and a second optical auxiliary layer of a display substrate according to an embodiment of the present disclosure;

[0040] FIG. 5 is a cross-sectional structural schematic diagram of a second optical auxiliary layer of a display substrate according to an embodiment of the present disclosure;

[0041] FIG. 6 is a schematic diagram of a cross-sectional structure of a first optical auxiliary layer of a display substrate according to an embodiment of the present disclosure;

[0042] FIGS. 7a to 7d are top views of a first metasurface pattern of a display substrate according to an embodiment of the present disclosure;

[0043] FIGS. 8a to 8d are top views of a second metasurface pattern of a display substrate according to an embodiment of the present disclosure;

[0044] FIG. 9 is a schematic diagram of a cross-sectional structure of a display region of a display substrate according to another embodiment of the present disclosure;

[0045] FIG. 10 is a schematic diagram of a cross-sectional structure of a first reflection pattern in a display substrate according to an embodiment of the present disclosure;

[0046] FIG. 11 is a schematic diagram of a cross-sectional structure of a microstructure of a third optical auxiliary layer in a display substrate according to an embodiment of the present disclosure;

[0047] FIG. 12 is a schematic diagram of a light path of a first reflection pattern in a display substrate according to an embodiment of the present disclosure;

[0048] FIG. 13 is a schematic diagram of a light path of a first reflection pattern in a display substrate according to another embodiment of the present disclosure.

[0049] Detailed Description

[0050] In order to make the objectives, technical solutions, and advantages of the present disclosure clearer, below, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that the embodiments can be implemented in a variety of different forms. It is easily understood by those skilled in the art that the embodiments and contents can be changed into various forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the contents described in the following embodiments. The embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other on the premise of no conflict.

[0051] The scale of the drawings in the present disclosure can be used as a reference in an actual process, but is not limited thereto. For example, the width-length ratio of a channel, the thickness and pitch of each film layer, and the width and pitch of each signal line can be adjusted as needed. The number of pixels in a display substrate and the number of sub-pixels in each pixel are also not limited to the number shown in the drawings. The drawings described in the present disclosure are merely schematic diagrams, and one embodiment of the present disclosure is not limited to the shapes or values shown in the drawings.

[0052] The ordinal numbers "first", "second", "third", and the like in the present specification are set in order to avoid confusion of components, and are not intended to be limiting in terms of number.

[0053] In this specification, terms of "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicating the positional or directional relationship of the components are used to describe the positional relationship of the components with reference to the drawings for the convenience of explanation and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure. The positional relationship of the components is appropriately changed according to the direction in which each component is described. Therefore, it is not limited to the words described in the specification, and can be appropriately changed according to the situation.

[0054] In this specification, unless explicitly defined and limited otherwise, the terms "mount", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate, or communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0055] In this specification, a transistor refers to an element including at least a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between the drain electrode (drain electrode terminal, drain region, or drain electrode) and the source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, the channel region refers to a region through which current mainly flows.

[0056] In this specification, the first electrode can be a drain electrode, and the second electrode can be a source electrode, or the first electrode can be a source electrode, and the second electrode can be a drain electrode. In the case of using a transistor with opposite polarity or in the case of changing the direction of current in the circuit operation, the functions of "source electrode" and "drain electrode" are sometimes exchanged with each other. Therefore, in this specification, "source electrode" and "drain electrode" can be exchanged with each other, and "source terminal" and "drain terminal" can be exchanged with each other.

[0057] In this specification, "electrically connected" includes the case where the components are connected through an element having a certain electrical action. The element having a certain electrical action is not particularly limited as long as it can transmit and receive an electrical signal between the connected components. Examples of the element having a certain electrical action include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having various functions.

[0058] In the present specification, "parallel" refers to a state in which two straight lines form an angle of -10° or more and 10° or less, and thus, a state in which the angle is -5° or more and 5° or less is also included. In addition, "perpendicular" refers to a state in which two straight lines form an angle of 80° or more and 100° or less, and thus, a state in which the angle is 85° or more and 95° or less is also included.

[0059] In the present specification, "film" and "layer" can be exchanged with each other. For example, "conductive layer" can be sometimes replaced with "conductive film". Similarly, "insulating film" can be sometimes replaced with "insulating layer".

[0060] In the present specification, a triangle, a rectangle, a trapezoid, a pentagon, or a hexagon, and the like are not strictly so, and can be an approximate triangle, an approximate rectangle, an approximate trapezoid, an approximate pentagon, or an approximate hexagon, and can have some small deformation due to a tolerance, and can have a rounded corner, a rounded side, and deformation, and the like.

[0061] In the present disclosure, "about" means not strictly limited to a boundary, and allows a value within a range of process and measurement error.

[0062] The present disclosure provides a display substrate, comprising a sub-pixel region and a non-sub-pixel region located on the periphery of the sub-pixel region; the display substrate comprises a driving circuit layer arranged on a substrate, and a light-emitting structure layer arranged on a side of the driving circuit layer away from the substrate;

[0063] The light-emitting structure layer comprises at least a first electrode, a light-emitting layer, and a second electrode arranged in sequence along a direction away from the substrate;

[0064] The display substrate further comprises a first optical auxiliary layer and a second optical auxiliary layer arranged on the substrate, the second optical auxiliary layer is located on a side of the light-emitting layer close to the substrate, and the first optical auxiliary layer is located on a side of the second optical auxiliary layer close to the substrate;

[0065] The light emitted by the light-emitting layer passes through the first optical auxiliary layer and the second optical auxiliary layer in sequence and is emitted from the substrate, the second optical auxiliary layer is configured to converge the incident light and emit the converged light towards the direction of the first optical auxiliary layer; the first optical auxiliary layer is configured to convert the incident converged light into collimated light.

[0066] FIG. 1 is a structural schematic diagram of a display device. As shown in FIG. 1, the display device can include a timing controller, a data driver, a scan driver, an emission driver, and a pixel array. The timing controller is connected to the data driver, the scan driver, and the emission driver, respectively. The data driver is connected to a plurality of data signal lines (e.g., D1 to Dn), the scan driver is connected to a plurality of scan signal lines (e.g., S1 to Sm), and the emission driver is connected to a plurality of emission control lines (e.g., E1 to Eo), respectively. Here, n, m, and o can be natural numbers. The pixel array can include a plurality of sub-pixels Pxij, i and j can be natural numbers. At least one sub-pixel Pxij can include a pixel circuit and an emission device connected to the pixel circuit. The pixel circuit can be connected to the scan signal line, the emission control line, and the data signal line, respectively.

[0067] In some example embodiments, the timing controller can provide a gray scale value and a control signal suitable for the specification of the data driver to the data driver, can provide a clock signal, a scan start signal, and the like suitable for the specification of the scan driver to the scan driver, and can provide a clock signal, an emission stop signal, and the like suitable for the specification of the emission driver to the emission driver. The data driver can generate data voltages to be provided to the data signal lines D1, D2, D3,..., and Dn using the gray scale value and the control signal received from the timing controller. For example, the data driver can sample the gray scale value using the clock signal and apply data voltages corresponding to the gray scale value to the data signal lines D1 to Dn in units of a pixel row. The scan driver can generate scan signals to be provided to the scan signal lines S1, S2, S3,..., and Sm by receiving the clock signal, the scan start signal, and the like from the timing controller. For example, the scan driver can sequentially provide scan signals having on-pulse to the scan signal lines S1 to Sm. For example, the scan driver can be configured in the form of a shift register and can generate the scan signals in a manner of sequentially transferring the scan start signal provided in the form of an on-pulse to a next stage circuit under the control of the clock signal. The emission driver can generate emission control signals to be provided to the emission control lines E1, E2, E3,..., and Eo by receiving the clock signal, the emission stop signal, and the like from the timing controller. For example, the emission driver can sequentially provide emission signals having off-pulse to the emission control lines E1 to Eo. For example, the emission driver can be configured in the form of a shift register and can generate the emission control signals in a manner of sequentially transferring the emission stop signal provided in the form of an off-pulse to a next stage circuit under the control of the clock signal.

[0068] FIG. 2 is a schematic diagram of a structure of a display substrate according to an example embodiment. In some example embodiments, as shown in FIG. 2, the display substrate according to an example embodiment can include a display area 100, a binding area 200 located on one side of the display area 100, and a frame area 300 located on the other side of the display area 100.

[0069] In some examples, the display substrate can employ a flexible substrate, and thus the display substrate can be deformable, such as being crimped, bent, folded, or rolled up.

[0070] In some example embodiments, the binding area 200 can include a trace area, a driving chip area, and a binding pin area arranged in sequence along a direction away from the display area 100. The trace area is connected to the display area 100 and includes at least a plurality of lead lines configured to connect a plurality of data signal lines of the display area 100. The driving chip area can be provided with an integrated circuit (IC) configured to be connected to the plurality of lead lines. The binding pin area can include a bonding pad configured to be connected to an external flexible printed circuit (FPC).

[0071] In some example embodiments, the display substrate includes a display area 100 having a rectangular shape. In some embodiments, the display area 100 can also have a circular shape, an elliptical shape, or a polygonal shape such as a triangular shape, a pentagonal shape, etc.

[0072] In some example embodiments, the display substrate can be a flat display substrate. In some embodiments, the display substrate can also employ other types of display substrates. For example, a flexible display substrate, a foldable display substrate, a rollable display substrate, etc.

[0073] In some examples, the display area 100 can be a flat area including a plurality of sub-pixels Pxij constituting a pixel array, the plurality of sub-pixels Pxij can be configured to display dynamic pictures or still images, and the display area 100 can be referred to as an active area (AA).

[0074] In some example embodiments, the display area 100 of the display substrate can include a plurality of pixel units arranged in a matrix manner. For example, at least one pixel unit can include a first sub-pixel emitting light rays of a first color, a second sub-pixel emitting light rays of a second color, and a third sub-pixel emitting light rays of a third color.

[0075] In some example embodiments, the first sub-pixel can be a red sub-pixel (R) emitting red light, the second sub-pixel can be a blue sub-pixel (B) emitting blue light, and the third sub-pixel can be a green sub-pixel (G) emitting green light. In some examples, the shape of the light emitting device of the sub-pixel can be rectangular, diamond, pentagonal, or hexagonal, and the light emitting devices of the three sub-pixels can be arranged in a horizontal parallel, vertical parallel, or triangle shape, without limitation in the present disclosure.

[0076] In some example embodiments, the sub-pixel Pxij can include a pixel circuit and a light emitting device, the pixel circuit being electrically connected to a scan signal line, a data signal line, and a light emitting control line respectively, and the pixel circuit can be configured to receive a data voltage transmitted by the data signal line under the control of the scan signal line and the light emitting control line, and output a corresponding current to the light emitting device. The light emitting device in each sub-pixel is connected to the pixel circuit of the sub-pixel where the light emitting device is located, and the light emitting device is configured to emit light of a corresponding brightness in response to the current output by the pixel circuit of the sub-pixel where the light emitting device is located.

[0077] In some example embodiments, the light emitting device can include one of an organic light emitting diode (OLED), a micro light emitting diode (LED), and a quantum dot light emitting diode (QLED). The sub-pixel can emit light, such as red light, green light, blue light, or white light, through the light emitting device.

[0078] In some example embodiments, the light emitting device can adopt a bottom emission light emitting mode, or the light emitting device can adopt a top emission light emitting mode.

[0079] In the following, the light emitting device in the display substrate of the present embodiment is taken as an example of an organic light emitting diode (OLED), and the light emitting device adopts a bottom emission light emitting mode.

[0080] FIG. 3 is a schematic diagram of the cross-sectional structure of the display area of the display substrate of the present embodiment. FIG. 3 illustrates the structure of three sub-pixel regions (a first sub-pixel region 21, a second sub-pixel region 22, and a third sub-pixel region 23) in the display area. In some example embodiments, as shown in FIG. 3, the display substrate of the present embodiment includes the first sub-pixel region 21, the second sub-pixel region 22, and the third sub-pixel region 23 arranged at intervals along a direction parallel to the display substrate, and a non-sub-pixel region 50 located between the first sub-pixel region 21 and the second sub-pixel region 22 and between the second sub-pixel region 22 and the third sub-pixel region 23. The first sub-pixel region 21 emits first color light, the second sub-pixel region 22 emits second color light, the third sub-pixel region 23 emits third color light, and the non-sub-pixel region 50 does not emit light.

[0081] In some example embodiments, the display substrate can include, in a direction perpendicular to the display substrate, a substrate 101, and a driving circuit layer 102 and a light-emitting structure layer 103 disposed in sequence on the substrate 101. In some possible implementations, the display substrate can include other film layers, such as a touch structure layer, etc., which are not limited in the present disclosure.

[0082] In some example embodiments, the substrate 101 can be a flexible substrate, or can be a rigid substrate. The material of the substrate 101 can include quartz, glass, or other polymer materials.

[0083] In some example embodiments, the driving circuit layer 102 of each sub-pixel can include a pixel circuit composed of a plurality of transistors and a capacitor. The light-emitting structure layer 103 of each sub-pixel can include at least a first electrode 31, an organic light-emitting layer 32, and a second electrode 33 disposed in sequence away from the substrate 101, wherein the first electrode 31 can serve as an anode, and the second electrode 33 can serve as a cathode. The first electrode 31 is connected to the pixel circuit, the organic light-emitting layer 32 is connected to the first electrode 31, and the second electrode 33 is connected to the organic light-emitting layer 32. The organic light-emitting layer 32 emits light of a corresponding color under the driving of the first electrode 31 and the second electrode 33.

[0084] In some example embodiments, the first electrode 31 can be made of a conductive material with a light transmittance of greater than 90% to visible light, for example, the material of the first electrode 31 can be indium tin oxide (ITO).

[0085] In some example embodiments, the organic light-emitting layer 32 can include an emission layer (EML) and any one or more of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0086] In some example embodiments, one or more of the hole injection layer, the hole transport layer, the electron blocking layer, the hole blocking layer, the electron transport layer, and the electron injection layer of the first sub-pixel region 21, the second sub-pixel region 22, and the third sub-pixel region 23 can be a common layer connected together, and the second electrode of all the sub-pixels can be a common layer connected together.

[0087] In the following, the organic light-emitting layer 32 in the display substrate is taken as an example, which comprises a hole transport layer 321, a light-emitting layer 322 and an electron transport layer 323 arranged in sequence along the direction away from the substrate. The light-emitting layer 322 is located between the hole transport layer 321 and the electron transport layer 323, and the light-emitting layer 322 is in contact with the hole transport layer 321 and the electron transport layer 323 on both sides perpendicular to the substrate direction; the hole transport layer 321 is located on the side of the light-emitting layer 322 close to the first electrode 31, and the surface of the hole transport layer 321 away from the substrate is in contact with the light-emitting layer 322; the electron transport layer 323 is located on the side of the light-emitting layer 322 close to the second electrode 33, and the surface of the electron transport layer 323 close to the substrate is in contact with the light-emitting layer 322, and the surface of the electron transport layer 323 away from the substrate is in contact with the second electrode 33.

[0088] In some example embodiments, the display substrate of the present embodiment adopts a bottom emission light-emitting mode, and the light emitted by the light-emitting layer of each sub-pixel in the display substrate is emitted in the direction close to the substrate 101 and displayed through the substrate 101.

[0089] In some example embodiments, the display substrate of the present embodiment can further comprise a first optical auxiliary layer 11 and a second optical auxiliary layer 12, both of which are arranged on the side of the light-emitting layer close to the substrate, and the first optical auxiliary layer 11 is located on the side of the second optical auxiliary layer 12 close to the substrate. The light emitted by the light-emitting layer is emitted in sequence through the first optical auxiliary layer 11 and the second optical auxiliary layer 12 and then through the substrate 101. The second optical auxiliary layer 12 is configured to converge the incident light and emit the converged light in the direction of the first optical auxiliary layer 11; and the first optical auxiliary layer 11 is configured to convert the incident converged light into collimated light.

[0090] For example, the first optical auxiliary layer 11 is arranged on the side of the driving circuit layer 102 close to the substrate 101, for example, between the driving circuit layer 102 and the substrate 101, and the surface of the first optical auxiliary layer 11 close to the substrate 101 is in contact with the substrate 101. The second optical auxiliary layer 12 is arranged in the light-emitting structure layer 103 and located on the side of the light-emitting layer 322 of the driving circuit layer 102 close to the substrate 101, for example, between the hole transport layer 321 and the first electrode 31, and the surface of the second optical auxiliary layer 12 close to the substrate 101 is in contact with the surface of the first electrode 31 away from the substrate 101.

[0091] In some example embodiments, the first optical auxiliary layer 11 of the first sub-pixel region 21, the second sub-pixel region 22 and the third sub-pixel region 23 can be a common layer connected together.

[0092] In some example embodiments, the second optical auxiliary layer 12 of the first sub-pixel region 21, the second sub-pixel region 22 and the third sub-pixel region 23 can be a common layer connected together.

[0093] In some example embodiments, the display substrate of the present disclosure further comprises a first dielectric layer 41, which is arranged on the side of the first optical auxiliary layer 11 away from the substrate 101. For example, the surface of the first dielectric layer 41 close to the substrate 101 is in contact with the first optical auxiliary layer 11, and the surface of the first dielectric layer 41 away from the substrate 101 is in contact with the driving circuit layer 102. The first dielectric layer 41 is used to protect the first optical auxiliary layer 11. The first dielectric layer 41 can be made of an organic material, such as resin.

[0094] In some example embodiments, the display substrate of the present disclosure further comprises a second dielectric layer 42, which is arranged on the side of the second optical auxiliary layer 12 away from the substrate 101. For example, the surface of the second dielectric layer 42 close to the substrate 101 is in contact with the second optical auxiliary layer 12, and the surface of the second dielectric layer 42 away from the substrate 101 is in contact with the hole transport layer 321. The second dielectric layer 42 is used to protect the second optical auxiliary layer 12. The second dielectric layer 42 can be made of an organic material, such as resin.

[0095] FIG. 4 is a schematic diagram of the light path of the first optical auxiliary layer and the second optical auxiliary layer of the display substrate of the present disclosure. In some example embodiments, as shown in FIG. 4, the collimated light emitted by the light-emitting layer 322 towards the substrate 101 passes through the second optical auxiliary layer 12 and is gathered, and then is emitted towards the first optical auxiliary layer 11. The first optical auxiliary layer 11 receives the gathered light and converts it into collimated light emitted towards the substrate 101, and the substrate 101 transmits the collimated light for display.

[0096] The light emitted by the light-emitting layer of the display substrate of the present disclosure is gathered by the second optical auxiliary layer 12, and then is converted into collimated light emitted by the first optical auxiliary layer 11. The propagation path of the light is adjusted, the dissipation of the light between the film layers is reduced after the light is gathered, and the light-emitting uniformity is improved after the gathered light is converted into collimated light.

[0097] FIG. 5 is a schematic diagram of a cross-sectional structure of a second optical auxiliary layer of a display substrate according to an embodiment of the present disclosure. In some example embodiments, as shown in FIG. 5, the second optical auxiliary layer 12 of the display substrate according to an embodiment of the present disclosure includes a second substrate 12-1 and a plurality of second metasurface patterns 12-2 arranged in an array on the second substrate 12-1, the second metasurface patterns 12-2 being disposed on a surface of the second substrate 12-1 on a side close to the substrate 101, the second metasurface patterns 12-2 protruding from the surface of the second substrate 12-1, the second metasurface patterns 12-2 having a focusing function, and the array of the second metasurface patterns 12-2 being capable of converging collimated light emitted by the light-emitting layer and emitting the collimated light toward the first optical auxiliary layer 11.

[0098] In some example embodiments, the second substrate 12-1 can have a transmittance of visible light greater than 90%, for example, the second substrate 12-1 being fused quartz (SiO2).

[0099] In some example embodiments, the second metasurface patterns 12-2 can be nanostructures. The second metasurface patterns 12-2 can have a transmittance of visible light greater than 90%, for example, the material of the second metasurface patterns 12-2 can include at least one of silicon (Si), silicon dioxide (SiO2), and silicon nitride (SiN or Si3N4).

[0100] In some example embodiments, the second optical auxiliary layer 12 has a transmissive coaxial superlens focusing function for visible light, and is capable of converging collimated light emitted by the light-emitting layer and emitting the collimated light toward the first optical auxiliary layer 11. The basic principle of the focusing of the second optical auxiliary layer 12 is that the collimated light emitted by the light-emitting layer is incident on the second optical auxiliary layer 12, and the array of the second metasurface patterns 12-2 of the second optical auxiliary layer 12 converges the collimated light emitted by the light-emitting layer through resonant effect.

[0101] In some example embodiments, the shape of the orthographic projection of the second metasurface patterns 12-2 on the substrate can include at least one of a zigzag shape, a wavy shape, and a polygonal shape.

[0102] FIGS. 8a-8d are top views of a second metasurface pattern of a substrate according to embodiments of the present disclosure. In some example embodiments, the shape of the second metasurface pattern 12-2 in the second optical auxiliary layer 12 in the orthographic projection on the substrate can be a zigzag shape, as shown in FIG. 8a. Alternatively, the shape of the second metasurface pattern 12-2 in the second optical auxiliary layer 12 in the orthographic projection on the substrate can be a wavy shape, as shown in FIG. 8b. The polygon includes a rectangle and an inclined side arranged in the rectangle and connected to two opposite corners of the rectangle, as shown in FIG. 8c. The shape of the second metasurface pattern 12-2 in the second optical auxiliary layer 12 in the orthographic projection on the substrate can include a zigzag shape, a wavy shape, and a polygon including a rectangle and an inclined side arranged in the rectangle and connected to two opposite corners of the rectangle, as shown in FIG. 8d.

[0103] In practical applications, the number, shape, and distribution of the second metasurface pattern 12-2 in the second optical auxiliary layer 12 can be set according to actual needs, which are not limited herein.

[0104] In some example embodiments, the length of the second metasurface pattern 12-2 in the first direction D1 can be greater than or equal to 300 nm and less than or equal to 500 nm, the length of the second metasurface pattern 12-2 in the second direction D2 can be greater than or equal to 100 nm and less than or equal to 500 nm, and the height (length perpendicular to the first substrate direction) of the second metasurface pattern 12-2 can be greater than or equal to 200 nm and less than or equal to 500 nm. The first direction D1 and the second direction D2 are both parallel to the substrate 101, and the first direction D1 and the second direction D2 intersect each other, for example, the first direction D1 and the second direction D2 are perpendicular to each other.

[0105] In some example embodiments, the angle between the central axis of the second metasurface pattern 12-2 and the first direction D1 can be greater than or equal to 0 degrees and less than or equal to 180 degrees.

[0106] In some example embodiments, the phase front distribution of the light emitted by the second optical auxiliary layer 12 satisfies the following formula:

[0107] wherein (x2, y2) is the distance from any position in the second metasurface pattern array to the center point of the second metasurface pattern 12-2 array, f2 is the focal length of the second metasurface pattern array forming a lens, and λ2 is the wavelength of the light incident on the second metasurface pattern array, is the phase front distribution of the converging light emitted by the second optical auxiliary layer 12. For example, λ2 in the first sub-pixel is the wavelength of the first color light emitted by the first sub-pixel, λ2 in the second sub-pixel is the wavelength of the second color light emitted by the second sub-pixel, and λ2 in the third sub-pixel is the wavelength of the third color light emitted by the third sub-pixel.

[0108] In some example embodiments, the length of the first direction D1, the length of the second direction D2, the height, and the included angle between the central axis and the first direction D1 of the second super surface pattern 12-2 of the second optical auxiliary layer 12 can be adjusted according to the phase surface distribution of the above-mentioned formula, and the multiple degrees of freedom simultaneously adjust the transmission phase and the geometric phase to match the focusing phase surface.

[0109] FIG. 6 is a schematic diagram of a cross-sectional structure of the first optical auxiliary layer of the display substrate according to an embodiment of the present disclosure. In some example embodiments, as shown in FIG. 6, the first optical auxiliary layer 11 of the display substrate according to an embodiment of the present disclosure includes a first substrate 11-1 and a plurality of first super surface patterns 11-2 arranged in an array and disposed on the first substrate 11-1, the first super surface patterns 11-2 are disposed on the surface of the first substrate 11-1 close to the substrate 101, the first super surface patterns 11-2 protrude from the surface of the second substrate 12-1, the first super surface patterns 11-2 all have a diverging function, and the first super surface pattern array can collimate the incident converging light.

[0110] In some example embodiments, the material of the first substrate 11-1 can be a material with a visible light transmittance greater than 90%, for example, fused quartz (SiO2).

[0111] In some example embodiments, the first super surface pattern 11-2 can be a nano-scale structure. The first super surface pattern 11-2 has a visible light transmittance greater than 90%, for example, the material of the first super surface pattern 11-2 can include at least one of silicon (Si), silicon dioxide (SiO2), and silicon nitride (SiN or Si3N4).

[0112] In some example embodiments, the first optical auxiliary layer 11 has a transmission coaxial superlens collimation function for visible light, and can convert the light focused by the second optical auxiliary layer 12 into collimated light. The basic principle of the collimation of the first optical auxiliary layer 11 is that the light focused by the second optical auxiliary layer 12 is incident on the first optical auxiliary layer 11, and the first super surface pattern array of the first optical auxiliary layer 11 diffracts and collimates the light focused by the second optical auxiliary layer 12 through resonance effect.

[0113] In some example embodiments, the shape of the orthographic projection of the first super surface pattern 11-2 on the substrate can include at least one of a broken line shape, a wavy shape, and a polygonal shape.

[0114] FIGS. 7a to 7d are top views of the first super surface pattern of the display substrate according to an embodiment of the present disclosure.

[0115] In some example embodiments, the shape of the first super surface pattern 11-2 in the first optical auxiliary layer 11 can be a zigzag shape in the orthographic projection on the substrate, as shown in FIG. 7a. Alternatively, the shape of the first super surface pattern 11-2 in the first optical auxiliary layer 11 can be a wavy shape in the orthographic projection on the substrate, as shown in FIG. 7b. Alternatively, the shape of the first super surface pattern 11-2 in the first optical auxiliary layer 11 can be a polygon shape, which includes a rectangle and an inclined side arranged in the rectangle and connected to two opposite corners of the rectangle, as shown in FIG. 7c. The shape of the first super surface pattern 11-2 in the first optical auxiliary layer 11 can include a zigzag shape, a wavy shape, and a polygon shape, which includes a rectangle and an inclined side arranged in the rectangle and connected to two opposite corners of the rectangle, as shown in FIG. 7d.

[0116] In actual applications, the number, shape, and distribution of the first super surface pattern 11-2 in the first optical auxiliary layer 11 can be set according to actual needs, which are not limited herein.

[0117] In some example embodiments, the length of the first super surface pattern 11-2 in the first direction D1 can be greater than or equal to 300 nm and less than or equal to 500 nm, the length of the first super surface pattern 11-2 in the second direction D2 can be greater than or equal to 100 nm and less than or equal to 500 nm, and the height (length perpendicular to the first substrate direction) of the first super surface pattern 11-2 can be greater than or equal to 200 nm and less than or equal to 500 nm. Wherein, the first direction D1 and the second direction D2 are parallel to the substrate 101, and the first direction D1 and the second direction D2 intersect with each other, for example, the first direction D1 and the second direction D2 are perpendicular to each other.

[0118] In some example embodiments, the angle between the central axis of the first super surface pattern 11-2 and the first direction D1 can be greater than or equal to 0 degrees and less than or equal to 180 degrees.

[0119] In some example embodiments, the phase plane distribution of the light emitted by the first optical auxiliary layer 11 satisfies the following formula:

[0120] Wherein, (x1, y1) is the distance from any position in the first super surface pattern array to the center point of the first super surface pattern 11-2 array, f1 is the focal length of the lens formed by the first super surface pattern array, and λ1 is the wavelength of the light incident on the first super surface pattern array. is the phase front distribution of the collimated light emitted by the first optical auxiliary layer 11. For example, λ1 in the first sub-pixel is the wavelength of the first color light emitted by the first sub-pixel, λ1 in the second sub-pixel is the wavelength of the second color light emitted by the second sub-pixel, and λ1 in the third sub-pixel is the wavelength of the third color light emitted by the third sub-pixel.

[0121] In some example embodiments, the length of the first direction D1, the length of the second direction D2, the height, and the included angle between the central axis and the first direction D1 of the first super surface pattern 11-2 of the first optical auxiliary layer 11 can be adjusted according to the phase front distribution of the above formula, and multiple degrees of freedom are adjusted to match the collimated phase front.

[0122] The display substrate adjusts the light emitted by the light-emitting layer through the super surface pattern in the optical auxiliary layer, reduces the dissipation of light inside the film layer, improves the external quantum extraction efficiency of the light-emitting layer, enhances the light-emitting effect, and improves the light-emitting uniformity of the device.

[0123] The display substrate adjusts the propagation path of the light emitted by the light-emitting layer through the first super surface pattern 11-2 in the first optical auxiliary layer 11 and the second super surface pattern 12-2 in the second optical auxiliary layer 12. Compared with the traditional optical lens, the first super surface pattern 11-2 and the second super surface pattern 12-2 are single-film structures, the light does not need to pass through multiple waveguides, and the production cost is low. The first super surface pattern 11-2 and the second super surface pattern 12-2 have strong light field regulation and control capabilities, and can simplify the display substrate.

[0124] The first super surface pattern and the second super surface pattern of the display substrate are periodic or random two-dimensional patterns composed of sub-wavelength antennas. The super surface pattern can freely regulate and control different physical quantities such as amplitude, phase, and polarization of the light field on a sub-wavelength scale by designing the material, geometric shape, feature size, period size, etc. of the antenna. The super surface pattern uses the response of the sub-wavelength antenna to the incident light field to provide sudden changes in phase, amplitude, etc. Therefore, the light field can be modulated on a micron or even nanometer scale, greatly reducing the size of the device and improving the compactness of the optical system.

[0125] In some example embodiments, the first optical auxiliary layer 11 and the second optical auxiliary layer 12 can be prepared by electron beam evaporation and electron beam etching technology.

[0126] Take the first optical auxiliary layer 11 as an example. The preparation method of the first optical auxiliary layer 11 includes: first, spin-coating an electron beam resist film on the first substrate; then, forming a preset pattern of the first metasurface pattern array on the electron beam resist film by electron beam lithography, and exposing the first substrate in the area outside the preset pattern; then, depositing a metasurface film covering the preset pattern; then, removing the metasurface film on the exposed first substrate by using a stripping technique through ion etching treatment, and retaining the metasurface film on the preset pattern, so that the metasurface film on the preset pattern forms the first metasurface pattern array.

[0127] FIG. 9 is a schematic diagram of the cross-sectional structure of the display region of a display substrate according to another example embodiment of the present disclosure. In some example embodiments, as shown in FIG. 9, the structure of the display substrate according to the example embodiment of the present disclosure is basically the same as that of the example embodiment shown in FIG. 3, except that the display substrate according to the example embodiment further includes a third optical auxiliary layer 13, which is arranged on the side of the light-emitting layer 322 close to the second electrode 33, and is configured to reflect the light incident on the second electrode 33 towards the substrate.

[0128] The display substrate according to the example embodiment of the present disclosure is configured to reflect the light emitted by the light-emitting layer 322 towards the second electrode 33 towards the substrate by arranging the third optical auxiliary layer 13 between the light-emitting layer 322 and the second electrode 33, so as to avoid the light being absorbed by the second electrode 33 and reflected to the non-sub-pixel region, reduce the waste of light energy, improve the light-emitting efficiency, and enhance the light-emitting effect.

[0129] In some example embodiments, the third optical auxiliary layer 13 is arranged between the electron transport layer 323 and the second electrode 33, the surface of the third optical auxiliary layer 13 close to the substrate 101 is in contact with the surface of the electron transport layer 323 away from the substrate 101, and the surface of the third optical auxiliary layer 13 away from the substrate 101 is in contact with the surface of the second electrode 33 close to the substrate 101.

[0130] In some example embodiments, the third optical auxiliary layer 13 includes at least one reflection pattern located in the sub-pixel region, and a normal projection of the reflection pattern on the substrate does not overlap with the non-sub-pixel region. For example, the third optical auxiliary layer 13 includes a first reflection pattern 13-1 located in the first sub-pixel region 21, a second reflection pattern 13-2 located in the second sub-pixel region 22, and a third reflection pattern 13-3 located in the third sub-pixel region 23, and a normal projection of the first reflection pattern 13-1, the second reflection pattern 13-2, and the third reflection pattern 13-3 on the substrate does not overlap with the non-sub-pixel region. The first reflection pattern 13-1 is configured to reflect the light emitted by the light-emitting layer towards the second electrode 33 of the first sub-pixel region 21 towards the substrate; the second reflection pattern 13-2 is configured to reflect the light emitted by the light-emitting layer towards the second electrode 33 of the second sub-pixel region 22 towards the substrate; and the third reflection pattern 13-3 is configured to reflect the light emitted by the light-emitting layer towards the second electrode 33 of the third sub-pixel region 23 towards the substrate.

[0131] Hereinafter, the structure of the reflection pattern is described by taking the first reflection pattern as an example.

[0132] FIG. 10 is a schematic diagram of a cross-sectional structure of the first reflection pattern in the display substrate according to an example embodiment of the present disclosure. In some example embodiments, as shown in FIG. 10, the first reflection pattern 13-1 includes a plurality of microstructures 61 arranged in an array and protruding towards the second electrode 33, and a reflection layer 62 covering the surfaces of the microstructures 61 exposed away from the substrate. For example, the microstructures 61 can be arranged on the surface of the electron transport layer 323 away from the substrate 101.

[0133] In some example embodiments, the microstructures 61 can be nanostructures. The microstructures 61 can have a light transmittance of greater than 90% for visible light, for example, the material of the microstructures 61 can include at least one of silicon (Si), silicon dioxide (SiO2), and silicon nitride (SiN or Si3N4).

[0134] In some example embodiments, the reflection layer 62 covers all the surfaces of the microstructures 61 exposed away from the substrate, and the reflection layer 62 can have a reflectivity of greater than or equal to 98% for visible light.

[0135] FIG. 11 is a schematic diagram of a cross-sectional structure of the microstructures of the third optical auxiliary layer in the display substrate according to an example embodiment of the present disclosure. In some example embodiments, as shown in FIG. 11, the microstructures 61 can be prisms, for example, the microstructures 61 can be three-sided right-angle prisms, one of the right-angle sides of the three-sided right-angle prisms serves as a bottom side and contacts the electron transport layer 323, and the other two right-angle sides and the inclined side of the three-sided right-angle prisms serve as side surfaces and are covered by the reflection layer 62.

[0136] The display substrate according to the embodiments of the present disclosure forms a reflection pattern through the microstructure and the reflection layer, can reflect the light emitted by the light-emitting layer 322 towards the second electrode 33 towards the substrate, reduce the proportion of light reflected to the non-sub-pixel area, and improve the light emission efficiency. The reflection pattern formed by the microstructure and the reflection layer has a simple structure compared with optical film layers such as roughened substrate surface, textured glass surface, and microlens array, and can be mass-produced.

[0137] FIG. 12 is a schematic diagram of a light path of the first reflection pattern in the display substrate according to the embodiments of the present disclosure. In some example embodiments, as shown in FIG. 12, the collimated light Li1 emitted by the light-emitting layer towards the second electrode passes through the microstructure 61 along a direction perpendicular to the substrate 101, is emitted to the reflection layer 62, and is reflected towards the substrate after twice reflection of the reflection layer 62 on the adjacent microstructure 61 in the first reflection pattern 13-1. The light reflected by the reflection layer 62 is substantially parallel to the light incident on the first reflection pattern.

[0138] FIG. 13 is a schematic diagram of a light path of the first reflection pattern in the display substrate according to the embodiments of the present disclosure. In some example embodiments, as shown in FIG. 13, when the light-emitting layer is regarded as an infinite number of point light sources, the light Li2 emitted by the light-emitting layer towards the second electrode passes through the microstructure 61 along a direction inclined to the plane where the substrate 101 is located by an angle greater than 0 degree and less than 90 degrees, is emitted to the reflection layer 62, and is reflected towards the substrate after twice reflection of the reflection layer 62 on the adjacent microstructure 61 in the first reflection pattern 13-1. The light reflected by the reflection layer 62 is substantially parallel to the light incident on the first reflection pattern.

[0139] In some example embodiments, the preparation method of the first reflection pattern comprises: first, forming an optical film layer on the electron transport layer 323, the optical film layer having a visible light transmittance greater than 90%; then, forming the optical film layer into a plurality of microstructures 61 through a hard mask process; and then, forming a reflection layer 62 on the surface of the microstructure 61.

[0140] The present disclosure also provides a display device, which comprises the display substrate described above. The display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like, without being limited thereto.

[0141] The present application describes a number of embodiments, but the description is exemplary rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described in the present application. Although a number of possible combinations of features have been set forth in the appended figures and discussed above, many other combinations of the disclosed features are possible. Unless specifically intended otherwise, any feature or element of any embodiment can be used in combination with any other feature or element of any other embodiment, or in replacement of any other feature or element in any other embodiment.

[0142] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed herein can also be combined with any conventional features or elements to form a unique application of the presently claimed application that is not specifically disclosed. Any feature or element of any embodiment can also be combined with features or elements from other applications to form another unique application of the presently claimed application that is not specifically disclosed. Thus, it should be understood that any feature shown and / or discussed in the present application can be used alone or in any suitable combination. Accordingly, the embodiments are not to be restricted, except as by the appended claims and their equivalents. Furthermore, various modifications and changes can be made within the scope of the attached claims.

[0143] Furthermore, in describing representative embodiments, the specification can have presented the method and / or process as a particular sequence of steps. However, to the extent that the method or process depends on the particular order of steps, this description should not be construed as limiting unless specifically so stated. Other steps can be performed in between described steps without departing from the scope of the present application. Thus, the particular order of the steps presented is not a limitation. The specification is not a limitation and can be practiced in other than the particular order using other steps, and equivalent steps, and in alternative embodiments.

Claims

1. A display substrate comprising a sub-pixel region and a non-sub-pixel region located on the periphery of the sub-pixel region; the display substrate comprising a driving circuit layer disposed on a substrate, and a light-emitting structure layer disposed on a side of the driving circuit layer away from the substrate; the light-emitting structure layer comprising at least a first electrode, a light-emitting layer, and a second electrode disposed in sequence along a direction away from the substrate; the display substrate further comprising a first optical auxiliary layer and a second optical auxiliary layer disposed on the substrate, the second optical auxiliary layer being located on a side of the light-emitting layer close to the substrate, and the first optical auxiliary layer being located on a side of the second optical auxiliary layer close to the substrate; light emitted by the light-emitting layer passes through the first optical auxiliary layer and the second optical auxiliary layer in sequence and is emitted from the substrate, the second optical auxiliary layer is configured to converge incident light and emit the converged light towards the direction of the first optical auxiliary layer; and the first optical auxiliary layer is configured to convert the incident converged light into collimated light. 2.The display substrate of claim 1, wherein, The second optical auxiliary layer is disposed in the light-emitting structure layer. 3.The display substrate of claim 2, wherein, The light-emitting structure layer further comprises a hole transport layer disposed on a side of the light-emitting layer close to the first electrode, the second optical auxiliary layer is disposed between the hole transport layer and the first electrode, and a surface of the second optical auxiliary layer on a side close to the substrate is in contact with the first electrode. 4.The display substrate of claim 1, wherein, The second optical auxiliary layer comprises a second base and a plurality of second metasurface patterns arranged in an array on the second base, the second metasurface patterns are disposed on a surface of the second base on a side close to the substrate, the second metasurface patterns protrude from the surface of the second base, and the second metasurface patterns are configured to converge incident light and emit the converged light towards the first optical auxiliary layer. 5.The display substrate of claim 4, wherein, The second metasurface patterns have a light transmittance of greater than 90% for visible light. 6.The display substrate of claim 5, wherein, The second metasurface patterns can comprise at least one of silicon, silicon dioxide, and silicon nitride. 7.The display substrate of claim 4, wherein, The shape of the second metasurface patterns in orthographic projection on the substrate comprises at least one of a broken line, a wave shape, and a polygon. 8.The display substrate of claim 4, wherein, The length of the second metasurface patterns in a first direction is greater than or equal to 300 nm and less than or equal to 500 nm, the length of the second metasurface patterns in a second direction is greater than or equal to 100 nm and less than or equal to 500 nm, and the height of the second metasurface patterns is greater than or equal to 200 nm and less than or equal to 500 nm, the first direction and the second direction are both parallel to the substrate, and the first direction and the second direction intersect each other. 9.The display substrate of claim 4, wherein, The phase front distribution of the light rays emitted by the second optical auxiliary layer satisfies the following formula: where (x2, y2) is the distance from any position in the second metasurface pattern array to the center point of the second metasurface pattern array, f2 is the focal length of the lens formed by the second metasurface pattern array, and l2 is the wavelength of the light incident on the second metasurface pattern array, The phase front distribution of light emitted by the second optical auxiliary layer. 10.The display substrate of claim 1, wherein, The first optical auxiliary layer is disposed on a side of the driving circuit layer close to the substrate, and a surface of the first optical auxiliary layer on a side close to the substrate is in contact with the substrate. 11.The display substrate of claim 1, wherein, The first optical auxiliary layer comprises a first substrate and a plurality of first metasurface patterns arranged in an array on the first substrate, the first metasurface patterns are arranged on the surface of the first substrate close to the substrate side, the first metasurface patterns protrude from the surface of the first substrate, and the first metasurface patterns are configured to collimate the incident light towards the substrate. 12.The display substrate of claim 11, wherein, The first metasurface pattern has a light transmittance of greater than 90% for visible light. 13.The display substrate of claim 12, wherein, The first metasurface pattern can include at least one of silicon, silicon dioxide, and silicon nitride. 14.The display substrate of claim 11, wherein, The shape of the first metasurface pattern in orthographic projection on the substrate includes at least one of a broken line, a wave shape, and a polygon. 15.The display substrate of claim 11, wherein, The length of the first metasurface pattern in a first direction is greater than or equal to 300 nm and less than or equal to 500 nm, the length of the first metasurface pattern in a second direction is greater than or equal to 100 nm and less than or equal to 500 nm, and the height of the first metasurface pattern is greater than or equal to 200 nm and less than or equal to 500 nm, the first direction and the second direction are both parallel to the substrate, and the first direction and the second direction intersect each other. 16.The display substrate of claim 11, wherein, The phase front distribution of the light rays emitted by the first optical auxiliary layer satisfies the following formula: where (x1, y1) is the distance from any position in the first metasurface pattern array to the center point of the first metasurface pattern array, f1 is the focal length of the lens formed by the first metasurface pattern array, and λ1 is the wavelength of the light incident on the first metasurface pattern array, is a phase front distribution of the light emitted by the first optical auxiliary layer.

17. The display substrate of any one of claims 1 to 16, further comprising a first dielectric layer disposed on the side of the first optical auxiliary layer away from the substrate and in contact with the first optical auxiliary layer.

18. The display substrate of any one of claims 1 to 16, further comprising a second dielectric layer disposed on the side of the second optical auxiliary layer away from the substrate and in contact with the second optical auxiliary layer.

19. The display substrate of any one of claims 1 to 16, further comprising a third optical auxiliary layer disposed on the side of the light-emitting layer close to the second electrode, the third optical auxiliary layer being configured to reflect the incident light towards the substrate. 20.The display substrate of claim 19, wherein, The light reflected by the third optical auxiliary layer is substantially parallel to the light incident on the third optical auxiliary layer. 21.The display substrate of claim 19, wherein, The third optical auxiliary layer comprises at least one reflection pattern located in the sub-pixel region, the reflection pattern comprises a plurality of microstructures arranged in an array and protruding towards the second electrode, and a reflection layer covering the surface of the microstructures away from the substrate.

22. The display substrate of claim 21, wherein, The reflection layer has a reflectivity of greater than or equal to 98% for visible light.

23. The display substrate of claim 21, wherein, The microstructure is a three-sided right-angle prism.

24. A display device comprising: The display substrate as claimed in any one of claims 1 to 23.

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