Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises: a substrate; the plurality of light-emitting devices are arranged on the substrate, and each light-emitting device comprises a first electrode, a light-emitting layer and a second electrode which are sequentially arranged in the direction away from the substrate; the reflection electrodes are located between the first electrodes and the substrate, the reflection electrodes and the first electrodes are arranged in a spaced mode, and the reflection electrodes are configured to reflect light emitted by the corresponding light-emitting devices in the direction away from the substrate; the driving circuit layer is located between the reflection electrode and the substrate, the driving circuit layer comprises a plurality of first connecting electrodes and a plurality of second connecting electrodes, the first electrodes are correspondingly connected with the first connecting electrodes, the reflection electrode is correspondingly connected with the second connecting electrodes, and the first connecting electrodes and the second connecting electrodes are mutually independent; and the second connecting electrode is connected with a preset grounding point on the driving circuit layer.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0002] With the development of display technology, OLED devices (Organic Light-Emitting Diode) came into being. OLED devices adopt a structure of a first electrode, a light-emitting layer, and a second electrode. By forming a voltage between the first electrode and the second electrode, electrons and holes meet and combine in the light-emitting layer to generate excitons, and the excitons radiate to generate photons to emit light. Since most light-emitting devices generate white light, color films of various colors are usually formed above the light-emitting devices so that the light of various colors can be combined to form a variety of colors of light. Summary of the invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art, and proposes a display substrate and a display device.

[0004] In order to achieve the above objective, according to one aspect of the present disclosure, a display substrate is provided, comprising:

[0005] substrate substrate;

[0006] A plurality of light-emitting devices, wherein the plurality of light-emitting devices are arranged on the base substrate, and the light-emitting devices include a first electrode, a light-emitting layer, and a second electrode which are sequentially arranged in a direction away from the base substrate;

[0007] a plurality of reflective electrodes, the reflective electrodes being located between the first electrode and the base substrate and spaced apart from the first electrode, the reflective electrodes being configured to reflect light emitted by the corresponding light emitting device in a direction away from the base substrate;

[0008] A driving circuit layer, wherein the driving circuit layer is located between the reflective electrode and the base substrate, the driving circuit layer comprises a plurality of first connecting electrodes and a plurality of second connecting electrodes, the first electrodes are connected to the first connecting electrodes correspondingly, the reflective electrode is connected to the second connecting electrodes correspondingly, the first connecting electrodes and the second connecting electrodes are independent of each other, and the second connecting electrode is connected to a preset grounding point on the driving circuit layer.

[0009] In some optional embodiments, the first connecting electrode and the second connecting electrode are in the same layer.

[0010] In some optional embodiments, different first electrodes are connected to different first connecting electrodes; and different reflective electrodes are connected to different second connecting electrodes.

[0011] In some optional embodiments, the orthographic projection of the reflective electrode on the base substrate covers and exceeds the orthographic projection of the second connecting electrode on the base substrate, and the orthographic projection of the reflective electrode on the base substrate is spaced apart from the orthographic projection of the first connecting electrode on the base substrate.

[0012] In some optional embodiments, the plurality of light emitting devices have a plurality of colors, the distances from the first electrodes of the light emitting devices of different colors to the corresponding reflective electrodes are different, and the distances from the first electrodes of the light emitting devices of the same color to the corresponding reflective electrodes are the same.

[0013] In some optional embodiments, the plurality of light emitting devices include a red light emitting device emitting red light, a green light emitting device emitting green light, and a blue light emitting device emitting blue light.

[0014] The distance from the first electrode of the red light emitting device to the corresponding reflective electrode is greater than the distance from the first electrode of the green light emitting device to the corresponding reflective electrode;

[0015] The distance from the first electrode of the green light emitting device to the corresponding reflective electrode is greater than the distance from the first electrode of the blue light emitting device to the corresponding reflective electrode.

[0016] In some optional embodiments, the distances from the first electrodes of all the light-emitting devices to the substrate are the same.

[0017] In some optional embodiments, the display substrate further includes a plurality of lenses, at least one of the lenses is disposed between the first electrode of the light-emitting device and the corresponding reflective electrode, and the lens is configured to converge the light reflected by the reflective electrode.

[0018] In some optional embodiments, a lens is disposed between the first electrode of each light-emitting device and the corresponding reflective electrode, and the minimum distance from the first electrode of each light-emitting device to the corresponding lens is the same.

[0019] In some optional embodiments, the minimum distance from the first electrode of each light-emitting device to the corresponding lens is greater than or equal to 0.

[0020] In some optional embodiments, a surface of the lens facing the light emitting device is a convex surface, and a surface of the lens facing the reflective electrode is a flat surface.

[0021] In some optional embodiments, the plurality of light-emitting devices include a blue light-emitting device that emits blue light, and a surface of the lens corresponding to the blue light-emitting device that faces the substrate is in contact with the corresponding reflective electrode.

[0022] In some optional embodiments, the refractive index of the material of the lens is greater than 1.7.

[0023] In some optional embodiments, the display substrate further includes an insulating layer, which is disposed between the driving circuit layer and the first electrode, the reflective electrode and the lens are embedded in the insulating layer, the insulating layer has a plurality of first conductive holes and a plurality of second conductive holes, each of the first electrodes is connected to the corresponding first connecting electrode through the first conductive hole, and each of the reflective electrodes is connected to the corresponding second connecting electrode through the second conductive hole.

[0024] In some optional embodiments, the display substrate further includes a pixel defining layer, the pixel defining layer has a pixel opening, and a portion of the light emitting device is located in the pixel opening.

[0025] The orthographic projection of the pixel defining layer on the base substrate covers and exceeds the orthographic projection of the first conductive hole on the base substrate.

[0026] In some optional embodiments, the cross section of the pixel opening in a direction parallel to the substrate is a polygon, and the first conductive hole is located outside the pixel opening and close to a corner of the polygon.

[0027] In some optional embodiments, the pixel defining layer includes a first pixel sublayer, a second pixel sublayer and a third pixel sublayer stacked sequentially in a direction away from the base substrate, wherein;

[0028] An edge of an orthographic projection of a surface of the second pixel sublayer facing the base substrate on the base substrate is located inside an edge of an orthographic projection of a surface of the first pixel sublayer away from the base substrate on the base substrate;

[0029] The orthographic projection of the surface of the third pixel sublayer facing the substrate substrate on the substrate substrate covers and exceeds the orthographic projection of the surface of the second pixel sublayer away from the substrate substrate on the substrate substrate, and the edge of the orthographic projection of the surface of the second pixel sublayer away from the substrate substrate on the substrate substrate is located on the inner side of the edge of the orthographic projection of the surface of the third pixel sublayer facing the substrate substrate on the substrate substrate.

[0030] In some optional embodiments, the light emitting device, the reflective electrode and the driving circuit layer are integrated on the base substrate.

[0031] According to another aspect of the present disclosure, a display device is provided, comprising the above-mentioned display substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0033] Figure 1 A schematic structural diagram of a display substrate according to an optional embodiment of the present disclosure is shown;

[0034] Figure 2 A top view of a display substrate according to another optional embodiment of the present disclosure is shown;

[0035] Figures 3a to 3n A manufacturing flow chart of a display substrate according to an optional embodiment of the present disclosure is shown.

[0036] 10. Base substrate; 20. Light-emitting device; 21. First electrode; 22. Light-emitting layer; 23. Second electrode; 30. Reflective electrode; 31. First reflective metal layer; 311. First metal layer; 32. Second reflective metal layer; 321. Second metal layer; 40. Drive circuit layer; 41. First connecting electrode; 42. Second connecting electrode; 50. Lens; 60. Insulating layer; 61. First conductive hole; 62. Second conductive hole; 70. Pixel defining layer; 71. Pixel opening; 72. First pixel sublayer; 73. Second pixel sublayer; 74. Third pixel sublayer; 80. First photoresist layer; 100. Second photoresist layer; 110. Lens material layer; 120. Transfer mold. DETAILED DESCRIPTION

[0037] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] As used herein, "parallel" and "perpendicular" include the described situation and the situation similar to the described situation, and the range of the similar situation is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°.

[0041] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0042] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0043] Since most light-emitting devices generate white light, a color film of multiple colors is usually formed above the light-emitting device so that the light of multiple colors can be combined to form a variety of colors of light. Usually, a color film and a lens are arranged above the light-emitting device to achieve high brightness specifications, but this structure has disadvantages such as small viewing angle and short life.

[0044] In addition, since the reflective electrode is in a free state, parasitic capacitance is easily generated between the reflective electrode and the driving circuit layer.

[0045] In some related technologies, a conductive hole is provided under the reflective electrode 30, and a potential difference is formed between the conductive hole and the reflective electrode 30, so that charge accumulation is formed on the reflective electrode 30. When the display substrate is not working, a new potential difference is formed again between the accumulated charge of the reflective electrode 30 and the conductive hole, which affects the display effect of the device.

[0046] like Figure 1 As shown, the display substrate includes a base substrate 10, a plurality of light-emitting devices 20, a plurality of reflective electrodes 30 and a driving circuit layer 40. The plurality of light-emitting devices 20 are arranged on the base substrate 10. The light-emitting devices 20 include a first electrode 21, a light-emitting layer 22 and a second electrode 23 which are sequentially arranged in a direction away from the base substrate 10. The reflective electrode 30 is located between the first electrode 21 and the base substrate 10 and is spaced apart from the first electrode 21. The reflective electrode 30 is configured to reflect the light emitted by the corresponding light-emitting device 20 in a direction away from the base substrate 10. The driving circuit layer 40 is located between the reflective electrode 30 and the base substrate 10. The driving circuit layer 40 includes a plurality of first connecting electrodes 41 and a plurality of second connecting electrodes 42. The first electrode 21 is connected to the first connecting electrode 41 correspondingly, the reflective electrode 30 is connected to the second connecting electrode 42 correspondingly, the first connecting electrode 41 and the second connecting electrode 42 are independent of each other, and the reflective electrode 30 is connected to a preset grounding point on the driving circuit layer 40 through the second connecting electrode 42.

[0047] A portion of the light emitted by the light-emitting layer 22 is directed toward the first electrode 21, and then passes through the first electrode 21 to the reflective electrode 30. The reflective electrode 30 reflects the light and then passes through the first electrode 21, the light-emitting layer 22 and the second electrode 23 in sequence to be emitted. In this process, the light oscillates back and forth between the second electrode 23 and the reflective electrode 30, and the second electrode 23 and the reflective electrode 30 form an optical resonant cavity. By setting the first electrode 21 and the reflective electrode 30 at intervals, it is beneficial to adjust the distance between the first electrode 21 and the reflective electrode 30, and then it is beneficial to adjust the cavity length of the optical resonant cavity and improve the light extraction efficiency of the display substrate. In addition, the first electrode 21 and the reflective electrode 30 are respectively connected to the first connecting electrode 41 and the second connecting electrode 42 that are independent of each other, and the second connecting electrode 42 is connected to a preset grounding point, so that the reflective electrode 30 is grounded through the second connecting electrode 42 to avoid capacitive coupling between the reflective electrode 30 and the driving circuit layer 40. In the present disclosure, the reflective electrode 30 is grounded through the second connecting electrode 42 , so that the charges formed in any state of the display will be introduced into the ground layer instead of being accumulated on the reflective electrode 30 , which effectively improves the working stability of the display substrate.

[0048] In some optional embodiments, the first connection electrode 41 and the second connection electrode 42 are in the same layer. The first connection electrode 41 and the second connection electrode 42 are manufactured in the same process, and the first connection electrode 41 and the second connection electrode 42 are independent of each other, and the first connection electrode 41 and the second connection electrode 42 receive different signals.

[0049] In some optional embodiments, different first electrodes 21 are connected to different first connection electrodes 41; different reflective electrodes 30 are connected to different second connection electrodes 42. Different first connection electrodes 41 are connected to different signal ports, and different second connection electrodes 42 can be connected to different signal ports or to the same signal port, which is not specifically limited here.

[0050] In some alternative embodiments, see Figure 1 , the positive projection of the reflective electrode 30 on the base substrate 10 covers and exceeds the positive projection of the second connection electrode 42 on the base substrate 10. The second connection electrode 42 is directly below the reflective electrode 30, and the second connection electrode 42 is electrically connected to the reflective electrode 30. The potential between the second connection electrode 42 and the reflective electrode 30 is the same, so as to avoid coupling capacitance between the two.

[0051] In some alternative embodiments, see Figure 1 , the orthographic projection of the reflective electrode 30 on the base substrate 10 is spaced from the orthographic projection of the first connection electrode 41 on the base substrate 10. Since the first connection electrode 41 is electrically connected to the first electrode 21, and the first connection electrode 41 is not electrically connected to the reflective electrode 30, there is a potential difference between the reflective electrode 30 and the first connection electrode 41. If the reflective electrode 30 and the first connection electrode 41 are arranged opposite to each other, coupling capacitance is easily generated between the two. By spacing the orthographic projection of the reflective electrode 30 on the base substrate 10 and the orthographic projection of the first connection electrode 41 on the base substrate 10, the risk of coupling capacitance generated between the reflective electrode 30 and the first connection electrode 41 can be reduced.

[0052] In some alternative embodiments, see Figure 1 , the distances from the first electrodes 21 of all the light emitting devices 20 to the base substrate 10 are the same. That is, all the first electrodes 21 are located at the same height, and the distances from the second electrodes 23 to the first electrodes 21 are the same, which is beneficial to improving the flatness of the display substrate. All the light emitting devices 20 are arranged at the same height difference, which reduces the risk of leakage of the light emitting devices 20 caused by the height difference between the light emitting devices 20 of different colors, and improves the working stability of the light emitting devices 20.

[0053] In some alternative embodiments, see Figure 1The plurality of light emitting devices 20 have a plurality of colors, and the distances from the first electrode 21 of the light emitting devices 20 of different colors to the corresponding reflective electrode 30 are different, and the distances from the first electrode 21 of the light emitting devices 20 of the same color to the corresponding reflective electrode 30 are the same. Since the wavelengths of light emitted by the light emitting devices 20 of different colors are different, the distances from the first electrode 21 of the light emitting devices 20 of different colors to the corresponding reflective electrode 30 are set to be different, so that the optimal resonant frequency of the optical resonant cavity matches the wavelength of light emitted by the light emitting device 20, so as to improve the light extraction efficiency of the light emitting device 20.

[0054] In some optional embodiments, the plurality of light emitting devices 20 include a red light emitting device emitting red light, a green light emitting device emitting green light, and a blue light emitting device emitting blue light. The distance from the first electrode 21 of the red light emitting device to the corresponding reflective electrode 30 is greater than the distance from the first electrode 21 of the green light emitting device to the corresponding reflective electrode 30; the distance from the first electrode 21 of the green light emitting device to the corresponding reflective electrode 30 is greater than the distance from the first electrode 21 of the blue light emitting device to the corresponding reflective electrode 30. The optimal resonant frequencies of the optical resonant cavities corresponding to the red light emitting device, the green light emitting device, and the blue light emitting device are different, so the cavity lengths of the optical resonant cavities of the three color light emitting devices are also different. The cavity length of the optical resonant cavity corresponding to the red light emitting device is the longest, the cavity length of the optical resonant cavity corresponding to the green light emitting device is the second longest, and the cavity length of the optical resonant cavity corresponding to the blue light emitting device is the shortest. Since the distance between the first electrode 21 and the second electrode 23 is unchanged, the distance between the first electrode 21 and the corresponding reflective electrode 30 is different, which makes the distance between the second electrode 23 and the corresponding reflective electrode 30 different, so that the cavity lengths of the optical resonant cavities corresponding to the light emitting devices 20 of different colors are different.

[0055] In some alternative embodiments, see Figure 1 The display substrate further includes a plurality of lenses 50. At least one lens 50 is disposed between the first electrode 21 of the light-emitting device 20 and the corresponding reflective electrode 30. The lens 50 is configured to converge the light reflected by the reflective electrode 30. The lens 50 is disposed between the first electrode 21 and the reflective electrode 30. The light emitted by the light-emitting layer 22 is collimated by the lens 50. The collimated light is more likely to be totally reflected at the position of the reflective electrode 30, thereby increasing the intensity of the reflected light. The lens 50 converges the light reflected by the reflective electrode 30, thereby increasing the intensity of the light emitted by the light-emitting device 20, improving the brightness of the light-emitting device 20, and improving the problem of pixel cross-color of the reflected light.

[0056] Since the lens 50 is located between the first electrode 21 and the reflective electrode 30, and the lens 50 converges the light reflected by the reflective electrode 30, the angle of the light emitted by the light emitting device 20 is reduced, and the lens 50 has no restrictions on the shape of the pixel opening, which is conducive to improving the aperture ratio of the display substrate. In addition, the process of setting the lens 50 between the first electrode 21 and the reflective electrode 30 does not deteriorate the viewing angle of the light emitting device 20.

[0057] In some alternative embodiments, see Figure 1 A lens 50 is disposed between the first electrode 21 of each light emitting device 20 and the corresponding reflective electrode 30, and the minimum distance from the first electrode 21 of each light emitting device 20 to the corresponding lens 50 is the same. The distance from each lens 50 to the first electrode 21 is the same, so that the light reflected by the reflective electrode 30 has the same degree of convergence after passing through the lens 50, so that the light emitting devices 20 of different colors have the same emission angle, thereby improving the display effect of the display substrate.

[0058] In some optional embodiments, the minimum distance between the first electrode 21 of each light emitting device 20 and the corresponding lens 50 is greater than or equal to 0. Figure 1 In the specific embodiment shown, the surface of the lens 50 facing the first electrode 21 is in contact with the first electrode 21, and at this time, the minimum distance between the first electrode 21 and the lens 50 is equal to 0. In some other embodiments, the minimum distance from the first electrode 21 of each light-emitting device 20 to the corresponding lens 50 may be greater than 0, and no specific limitation is made here, and the minimum distance from the first electrode 21 to the corresponding lens 50 can be determined according to specific needs.

[0059] In some optional embodiments, the surface of the lens 50 facing the light emitting device 20 is convex, and the surface of the lens 50 facing the reflective electrode 30 is flat. This configuration allows the lens 50 to collimate the light from the side where the light emitting device 20 is located, and to converge the light from the side where the reflective electrode 30 is located, which is beneficial to improving the light intensity of the light emitted by the light emitting device 20.

[0060] In some optional embodiments, the plurality of light-emitting devices 20 include a blue light-emitting device that emits blue light, and the surface of the lens 50 corresponding to the blue light-emitting device facing the substrate 10 is in contact with the corresponding reflective electrode 30. Since the cavity length of the optical resonant cavity corresponding to the blue light-emitting device is short, the distance between the first electrode 21 of the blue light-emitting device and the reflective electrode 30 is short, which in turn leads to a short distance between the reflective electrode 30 and the corresponding lens 50. According to actual needs, the reflective electrode 30 and the lens 50 can be arranged in close contact.

[0061] In some optional embodiments, the refractive index of the material of the lens 50 is greater than 1.7, so that the light can be better focused and the brightness can be better enhanced when entering the lens 50. For example, the material of the lens 50 is silicon nitride.

[0062] In some alternative embodiments, see Figure 1 The display substrate further includes an insulating layer 60, which is disposed between the driving circuit layer 40 and the first electrode 21. The reflective electrode 30 and the lens 50 are embedded in the insulating layer 60. The insulating layer 60 has a plurality of first conductive holes 61 and a plurality of second conductive holes 62. Each first electrode 21 is connected to the corresponding first connection electrode 41 through the first conductive hole 61, and each reflective electrode 30 is connected to the corresponding second connection electrode 42 through the second conductive hole 62. The first electrode 21 is connected to the first connection electrode 41 through the first conductive hole 61, and the reflective electrode 30 is connected to the second connection electrode 42 through the second conductive hole 62, so as to avoid interference between the reflective electrode 30 and the first electrode 21, which is conducive to avoiding coupling capacitance between the reflective electrode 30 and the driving circuit layer 40.

[0063] In some alternative embodiments, see Figure 1 The display substrate further includes a pixel defining layer 70, the pixel defining layer 70 has a pixel opening 71, a portion of the light emitting device 20 is located in the pixel opening 71, and the orthographic projection of the pixel defining layer 70 on the base substrate 10 covers and exceeds the orthographic projection of the first conductive hole 61 on the base substrate 10. This arrangement enables the pixel defining layer 70 to cover the location of the first conductive hole 61, which is conducive to reducing the influence of the first conductive hole 61 on the flatness of the first electrode 21 in the pixel opening 71, and improving the working stability of the light emitting device 20.

[0064] In some alternative embodiments, see Figure 1 The orthographic projection of the pixel defining layer 70 on the base substrate 10 is spaced from the orthographic projection of the second conductive hole 62 on the base substrate 10 . In other words, the orthographic projection of the pixel opening 71 on the base substrate 10 covers and exceeds the orthographic projection of the second conductive hole 62 on the base substrate 10 .

[0065] In some alternative embodiments, see Figure 2 , the orthographic projection of the pixel defining layer 70 on the base substrate 10 covers and exceeds the orthographic projection of the second conductive hole 62 on the base substrate 10 .

[0066] In some alternative embodiments, see Figure 2, the cross section of the pixel opening 71 in the direction parallel to the base substrate 10 is a polygon, and the first conductive hole 61 is located outside the pixel opening 71 and close to one corner of the polygon. This arrangement is conducive to the pixel defining layer 70 covering the portion of the first electrode 21 in contact with the first conductive hole 61 to ensure the flatness of the first electrode 21 in the pixel opening 71. For example, the cross section of the pixel opening 71 in the direction parallel to the base substrate 10 is a hexagon.

[0067] In some optional embodiments, the pixel defining layer 70 includes a first pixel sublayer 72, a second pixel sublayer 73 and a third pixel sublayer 74 which are sequentially stacked in a direction away from the base substrate 10, wherein;

[0068] The edge of the orthographic projection of the surface of the second pixel sublayer 73 facing the substrate 10 on the substrate 10 is located inside the edge of the orthographic projection of the surface of the first pixel sublayer 72 away from the substrate 10 on the substrate 10;

[0069] The orthographic projection of the surface of the third pixel sublayer 74 on the side facing the substrate substrate 10 on the substrate substrate 10 covers and exceeds the orthographic projection of the surface of the second pixel sublayer 73 on the side away from the substrate substrate 10 on the substrate substrate 10, and the edge of the orthographic projection of the surface of the second pixel sublayer 73 on the side away from the substrate substrate 10 on the substrate substrate 10 is located on the inner side of the edge of the orthographic projection of the surface of the third pixel sublayer 74 on the side facing the substrate substrate 10 on the substrate substrate 10.

[0070] By disposing the first pixel sublayer 72, the second pixel sublayer 73 and the third pixel sublayer 74 at the pixel opening 71 to form an undercut structure, it is beneficial to separate two adjacent light-emitting devices 20 and avoid crosstalk between the two adjacent light-emitting devices 20. In addition, such a setting can also increase the aperture ratio, reduce the influence of color deviation and improve the lifespan.

[0071] In some optional embodiments, the step difference L1 between the first pixel sublayer 72 and the third pixel sublayer 74 in the direction parallel to the display substrate is greater than or equal to 0.01um and less than or equal to 0.03um. If the step difference L1 between the first pixel sublayer 72 and the third pixel sublayer 74 in the direction parallel to the display substrate is greater than 0.03um, the undercut structure may fail. If the step difference L1 between the first pixel sublayer 72 and the third pixel sublayer 74 in the direction parallel to the display substrate is less than 0.01um, the third pixel sublayer 74 may easily block the first electrode 21.

[0072] In some optional embodiments, the step difference L2 between the second pixel sublayer 73 and the first pixel sublayer 72 in the direction parallel to the display substrate is greater than 0.08 um and less than 0.11 um. This configuration is beneficial for the undercut structure to separate the first electrodes 21 of two adjacent light emitting devices 20 .

[0073] In some optional embodiments, the width L3 of the pixel defining layer 70 covering the first electrode 21 is greater than or equal to 0.4um and less than or equal to 0.6um. This configuration is conducive to ensuring the contact area between the first electrode 21 and the light-emitting layer 22, while ensuring the first electrode 21 works stably.

[0074] In some optional embodiments, the distance D1 between two adjacent first electrodes 21 is greater than or equal to 0.2um and less than or equal to 0.6um. If the distance D1 between two adjacent first electrodes 21 is less than 0.2um, interference between the first electrodes 21 is likely to occur. If the distance D1 between two adjacent first electrodes 21 is greater than 0.6um, the aperture ratio is likely to decrease. The distance D1 between two adjacent first electrodes 21 is limited to a range of 0.2um to 0.6um, while ensuring that no interference occurs between two adjacent first electrodes 21, the aperture ratio of the display substrate is increased.

[0075] In some optional embodiments, the thickness H1 of the first pixel sublayer 72 is greater than or equal to 100Am and less than or equal to 400Am; the thickness H2 of the second pixel sublayer 73 is greater than or equal to 400Am and less than or equal to 1000Am; the thickness H3 of the third pixel sublayer 74 is greater than or equal to 100Am and less than or equal to 400Am. Limiting the thickness of the first pixel sublayer 72, the second pixel sublayer 73, and the third pixel sublayer 74 to a reasonable range is conducive to the pixel defining layer 70 spacing two adjacent light-emitting devices 20 apart, thereby avoiding crosstalk between the two adjacent light-emitting devices 20.

[0076] In some optional embodiments, the thickness H4 of the first electrode 21 is greater than or equal to 100Am and less than or equal to 400Am.

[0077] In some optional embodiments, the reflective electrode 30 includes a first reflective metal layer 31 and a second reflective metal layer 32, the second reflective metal layer 32 is located on the side of the first reflective metal layer 31 facing the base substrate 10, the thickness H5 of the first reflective metal layer 31 is greater than or equal to 500Am and less than or equal to 3000Am, and the thickness H6 of the second reflective metal layer 32 is greater than or equal to 100Am and less than or equal to 1000Am.

[0078] In some optional embodiments, the first reflective metal layer 31 is an aluminum layer, and the second reflective metal layer 32 is a titanium layer.

[0079] In some optional embodiments, the light emitting device 20, the reflective electrode 30 and the driving circuit layer 40 are integrated on the base substrate 10. For example, the base substrate 10 is a silicon-based substrate, and the light emitting device 20, the reflective electrode 30 and the driving circuit layer 40 are integrated on the silicon-based substrate.

[0080] According to another aspect of the present disclosure, a display device is provided, comprising the above-mentioned display substrate.

[0081] Figures 3a to 3n FIG. 1 is a flow chart of manufacturing the display substrate of the present disclosure. Figure 3a As shown, a driving circuit layer 40 is formed on the base substrate 10 , and the first connecting electrode 41 and the second connecting electrode 42 are independent of each other.

[0082] The second metal material and the first metal material are sequentially deposited on the base substrate 10 by sputtering to form a second metal layer 321 and a first metal layer 311, see Figure 3b , a first photoresist layer 80 having a first shape is coated on the first metal layer 311, and a reflective electrode 30 corresponding to the light-emitting device 20 of a first color is formed by a first patterning process, wherein in the reflective electrode 30 formed by the patterning process, the first metal layer 311 retained at last is used as the first reflective metal layer 31, and the second metal layer 321 retained is used as the second reflective metal layer 32, see Figure 3c and Figure 3d For example, the first metal material is metal titanium, and the second metal material is metal aluminum.

[0083] After forming the reflective electrode 30 corresponding to the light emitting device 20 of the first color, an insulating material layer is deposited by CVD (Chemical Vapor Deposition). Figure 3e The deposited insulating material layer is then polished flat using a CMP (chemical mechanical polishing) process. Figure 3f The ground insulating material layer is subjected to a patterning process to form a second conductive hole 62 corresponding to the reflective electrode 30, wherein the reflective electrode 30 corresponds to the light emitting device 20 of the second color, see Figure 3g to Figure 3j The specific manufacturing steps are: forming a second photoresist layer 100 having a second shape on the ground insulating material layer, see Figure 3g , and then exposure, development, and etching are performed to form Figure 3h The hole structure shown. To fill the hole structure with metal, refer to Figure 3i , for example, filling the metal dock. The metal on the insulating material layer is ground flat by the CMP process until the insulating material layer is exposed, see Figure 3j .

[0084] Forming a reflective electrode 30 corresponding to the light emitting device 20 of the second color, see Figure 3k .

[0085] Forming a reflective electrode 30 corresponding to the light emitting device 20 of the third color, see Figure 3l .

[0086] A lens material layer 110 is formed, and a plurality of lenses 50 are formed on the lens material layer 110 by coating, exposure, development and transfer mold 120, and an insulating material is deposited in the gaps between the lenses 50. The insulating material layer finally formed is used as the insulating layer 60. Figure 3m and Figure 3n For example, the insulating material is SiOx.

[0087] Finally, the first conductive via 61 is formed, and the first electrode 21 is formed on the first conductive via 61 .

[0088] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display substrate, characterized in that: include: substrate substrate; A plurality of light-emitting devices, wherein the plurality of light-emitting devices are arranged on the base substrate, and the light-emitting devices include a first electrode, a light-emitting layer, and a second electrode which are sequentially arranged in a direction away from the base substrate; a plurality of reflective electrodes, the reflective electrodes being located between the first electrode and the base substrate and spaced apart from the first electrode, the reflective electrodes being configured to reflect light emitted by the corresponding light emitting device in a direction away from the base substrate; A driving circuit layer, wherein the driving circuit layer is located between the reflective electrode and the base substrate, the driving circuit layer comprises a plurality of first connecting electrodes and a plurality of second connecting electrodes, the first electrodes are connected to the first connecting electrodes correspondingly, the reflective electrode is connected to the second connecting electrodes correspondingly, the first connecting electrodes and the second connecting electrodes are independent of each other, and the second connecting electrode is connected to a preset grounding point on the driving circuit layer.

2. The display substrate according to claim 1, characterized in that: The first connecting electrode and the second connecting electrode are in the same layer.

3. The display substrate according to claim 1, characterized in that: Different first electrodes are connected to different first connecting electrodes; Different of the reflective electrodes are connected to different of the second connecting electrodes.

4. The display substrate according to claim 1, characterized in that: The orthographic projection of the reflective electrode on the base substrate covers and exceeds the orthographic projection of the second connecting electrode on the base substrate, and the orthographic projection of the reflective electrode on the base substrate is spaced apart from the orthographic projection of the first connecting electrode on the base substrate.

5. The display substrate according to claim 1, characterized in that: The plurality of light emitting devices have a plurality of colors, and the distances from the first electrodes of the light emitting devices of different colors to the corresponding reflective electrodes are different, and the distances from the first electrodes of the light emitting devices of the same color to the corresponding reflective electrodes are the same.

6. The display substrate according to claim 5, characterized in that: The plurality of light emitting devices include a red light emitting device emitting red light, a green light emitting device emitting green light, and a blue light emitting device emitting blue light, The distance from the first electrode of the red light emitting device to the corresponding reflective electrode is greater than the distance from the first electrode of the green light emitting device to the corresponding reflective electrode; The distance from the first electrode of the green light emitting device to the corresponding reflective electrode is greater than the distance from the first electrode of the blue light emitting device to the corresponding reflective electrode.

7. The display substrate according to claim 5, characterized in that: The distances from the first electrodes of all the light-emitting devices to the substrate are the same.

8. The display substrate according to any one of claims 1 to 7, characterized in that: The display substrate further includes a plurality of lenses, at least one of which is disposed between the first electrode of the light-emitting device and the corresponding reflective electrode, and the lens is configured to converge the light reflected by the reflective electrode.

9. The display substrate according to claim 8, characterized in that: A lens is arranged between the first electrode of each light emitting device and the corresponding reflective electrode, and the minimum distance from the first electrode of each light emitting device to the corresponding lens is the same.

10. The display substrate according to claim 9, characterized in that: The minimum distance from the first electrode of each light-emitting device to the corresponding lens is greater than or equal to 0.

11. The display substrate according to claim 9, characterized in that: The surface of the lens facing the light emitting device is a convex surface, and the surface of the lens facing the reflective electrode is a flat surface.

12. The display substrate according to claim 11, characterized in that: The plurality of light emitting devices include a blue light emitting device emitting blue light, and a surface of the lens corresponding to the blue light emitting device facing the base substrate is in contact with the corresponding reflective electrode.

13. The display substrate according to claim 8, characterized in that: The material refractive index of the lens is greater than 1.

7.

14. The display substrate according to claim 8, characterized in that: The display substrate further includes an insulating layer, which is disposed between the driving circuit layer and the first electrode, the reflective electrode and the lens being embedded in the insulating layer, the insulating layer having a plurality of first conductive holes and a plurality of second conductive holes, each of the first electrodes being connected to the corresponding first connecting electrode through the first conductive hole, and each of the reflective electrodes being connected to the corresponding second connecting electrode through the second conductive hole.

15. The display substrate according to claim 14, characterized in that: The display substrate further includes a pixel defining layer, the pixel defining layer having a pixel opening, and a portion of the light emitting device is located in the pixel opening. The orthographic projection of the pixel defining layer on the base substrate covers and exceeds the orthographic projection of the first conductive hole on the base substrate.

16. The display substrate according to claim 15, characterized in that: The cross section of the pixel opening in a direction parallel to the base substrate is a polygon, and the first conductive hole is located outside the pixel opening and close to a corner of the polygon.

17. The display substrate according to claim 16, characterized in that: The pixel defining layer comprises a first pixel sublayer, a second pixel sublayer and a third pixel sublayer stacked sequentially in a direction away from the base substrate, wherein; An edge of an orthographic projection of a surface of the second pixel sublayer facing the base substrate on the base substrate is located inside an edge of an orthographic projection of a surface of the first pixel sublayer away from the base substrate on the base substrate; The orthographic projection of the surface of the third pixel sublayer facing the substrate substrate on the substrate substrate covers and exceeds the orthographic projection of the surface of the second pixel sublayer away from the substrate substrate on the substrate substrate, and the edge of the orthographic projection of the surface of the second pixel sublayer away from the substrate substrate on the substrate substrate is located on the inner side of the edge of the orthographic projection of the surface of the third pixel sublayer facing the substrate substrate on the substrate substrate.

18. The display substrate according to any one of claims 1 to 7, characterized in that: The light emitting device, the reflective electrode and the driving circuit layer are integrated on the base substrate.

19. A display device, characterized in that: A display substrate comprising the display substrate according to any one of claims 1 to 18.

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