Display substrate and display device

Abstract

The present disclosure provides a display substrate and a display device. The display substrate comprises: a substrate substrate; a plurality of light emitting devices, the plurality of light emitting devices are arranged on the substrate substrate, the light emitting device comprises a first electrode, a light emitting layer and a second electrode arranged in sequence in a direction away from the substrate substrate; a plurality of reflective electrodes, the reflective electrodes are located between the first electrode and the substrate substrate and are arranged spaced apart from the first electrode, the reflective electrodes are configured to reflect the light emitted by the corresponding light emitting device in a direction away from the substrate substrate; a driving circuit layer, the driving circuit layer is located between the reflective electrode and the substrate substrate, the driving circuit layer comprises a plurality of first connecting electrodes and a plurality of second connecting electrodes, the first electrode is connected with the first connecting electrode in correspondence, the reflective electrode and the second connecting electrode are connected in correspondence, the first connecting electrode and the second connecting electrode are independent of each other, and the second connecting electrode is connected with a preset ground point on the driving circuit layer.

Description

Technical Field

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

[0002] With the development of display technology, OLED (Organic Light-Emitting Diode) devices have emerged. OLED devices employ a structure consisting of a first electrode, an emissive layer, and a second electrode. By establishing a voltage between the first and second electrodes, electrons and holes meet and combine in the emissive layer to generate excitons, which then emit photons to produce light. Since most light-emitting devices produce white light, multiple color filters are typically formed above the device to combine different colors of light and create a variety of colors. Summary of the Invention

[0003] This 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] To achieve the above objectives, according to one aspect of this disclosure, a display substrate is provided, comprising:

[0005] Substrate;

[0006] A plurality of light-emitting devices are disposed on the substrate, and each light-emitting device includes a first electrode, a light-emitting layer and a second electrode arranged sequentially along a direction away from the substrate.

[0007] Multiple reflective electrodes are located between the first electrode and the substrate and are spaced apart from the first electrode. The reflective electrodes are configured to reflect light emitted by the corresponding light-emitting device in a direction away from the substrate.

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

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

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

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

[0012] In some alternative embodiments, the plurality of light-emitting devices have multiple colors, the distance from the first electrode of the light-emitting device of different colors to the corresponding reflective electrode is different, and the distance from the first electrode of the light-emitting device of the same color to the corresponding reflective electrode is the same.

[0013] In some alternative embodiments, the plurality of light-emitting devices include a red light-emitting device that emits red light, a green light-emitting device that emits green light, and a blue light-emitting device that emits 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 alternative embodiments, the distance from the first electrode of all the light-emitting devices to the substrate is the same.

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

[0018] In some alternative 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 alternative 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 alternative embodiments, the surface of the lens facing the light-emitting device is convex, and the surface of the lens facing the reflective electrode is flat.

[0021] In some alternative embodiments, the plurality of light-emitting devices include blue light-emitting devices that emit blue light, and the surface of the lens corresponding to the blue light-emitting device facing the substrate side is in contact with the corresponding reflective electrode.

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

[0023] In some alternative embodiments, the display substrate further includes an insulating layer 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 first electrode is connected to a corresponding first connection electrode through the first conductive hole, and each reflective electrode is connected to a corresponding second connection electrode through the second conductive hole.

[0024] In some alternative embodiments, the display substrate further includes a pixel defining layer having pixel openings, and a portion of the light-emitting device is located within the pixel openings.

[0025] The orthogonal projection of the pixel defining layer on the substrate covers and extends beyond the orthogonal projection of the first conductive hole on the substrate.

[0026] In some alternative embodiments, the pixel opening has a polygonal cross-section parallel to the substrate direction, and the first conductive hole is located outside the pixel opening and near a corner of the polygon.

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

[0028] The edge of the orthogonal projection of the surface of the second pixel sublayer facing the substrate onto the substrate is located inside the edge of the orthogonal projection of the surface of the first pixel sublayer away from the substrate onto the substrate.

[0029] The orthographic projection of the surface of the third pixel sublayer facing the substrate onto the substrate covers and extends the orthographic projection of the surface of the second pixel sublayer away from the substrate onto the substrate, and the edge of the orthographic projection of the surface of the second pixel sublayer away from the substrate onto the substrate is located inside the edge of the orthographic projection of the surface of the third pixel sublayer facing the substrate onto the substrate.

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

[0031] According to another aspect of this disclosure, a display device is provided, including the display substrate described above. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 A schematic diagram of the structure 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 alternative embodiment of this disclosure is shown;

[0035] Figures 3a to 3n A flowchart illustrating the fabrication process of a display substrate according to an alternative embodiment of this disclosure is shown.

[0036] 10. 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. Driving 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 sub-layer; 73. Second pixel sub-layer; 74. Third pixel sub-layer; 80. First photoresist layer; 100. Second photoresist layer; 110. Lens material layer; 120. Transfer mold. Detailed Implementation

[0037] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0039] Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; 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 situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°.

[0041] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0042] This document describes exemplary embodiments with reference to sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Therefore, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. Thus, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0043] Since most light-emitting devices produce white light, multi-color filters are typically formed above them to combine different colors of light into various colors. High brightness is usually achieved by placing a color filter and a lens above the light-emitting device, but this structure has drawbacks such as a narrow viewing angle and short lifespan.

[0044] Furthermore, 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 below the reflective electrode 30. A potential difference is formed between the conductive hole and the reflective electrode 30, which will cause charge to accumulate on the reflective electrode 30. When the display substrate is not working, the accumulated charge on the reflective electrode 30 and the conductive hole will form a new potential difference again, which will affect the display effect of the device.

[0046] like Figure 1 As shown, the display substrate includes a 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 disposed on the substrate 10. Each light-emitting device 20 includes a first electrode 21, a light-emitting layer 22, and a second electrode 23 arranged sequentially in a direction away from the substrate 10. The reflective electrode 30 is located between the first electrode 21 and the 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 substrate 10. The driving circuit layer 40 is located between the reflective electrode 30 and the 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 electrodes 21 are correspondingly connected to the first connecting electrodes 41, and the reflective electrodes 30 and the second connecting electrodes 42 are correspondingly connected. The first connecting electrodes 41 and the second connecting electrodes 42 are independent of each other. The reflective electrode 30 is connected to a preset ground point on the driving circuit layer 40 through the second connecting electrode 42.

[0047] A portion of the light emitted from the light-emitting layer 22 is directed towards the first electrode 21, then through the first electrode 21 to the reflective electrode 30. The reflective electrode 30 reflects the light, which then passes sequentially through the first electrode 21, the light-emitting layer 22, and the second electrode 23 before exiting. During this process, the light oscillates back and forth between the second electrode 23 and the reflective electrode 30, forming an optical resonant cavity. By spaced the first electrode 21 and the reflective electrode 30, the distance between them can be adjusted, which in turn facilitates adjusting the cavity length of the optical resonant cavity and improving the light extraction efficiency of the display substrate. Furthermore, the first electrode 21 and the reflective electrode 30 are respectively connected to the independent first connecting electrode 41 and the second connecting electrode 42, and the second connecting electrode 42 is connected to a preset ground point so that the reflective electrode 30 is grounded through the second connecting electrode 42, thereby preventing capacitive coupling between the reflective electrode 30 and the driving circuit layer 40. In this disclosure, the reflective electrode 30 is grounded through the second connecting electrode 42, so that the charge generated by the display substrate under any condition will be conducted to the ground layer and will not accumulate on the reflective electrode 30, which effectively improves the stability of the display substrate operation.

[0048] In some alternative embodiments, the first connecting electrode 41 and the second connecting electrode 42 are on the same layer. The first connecting electrode 41 and the second connecting electrode 42 are fabricated in the same process, and the first connecting electrode 41 and the second connecting electrode 42 are independent of each other, receiving different signals.

[0049] In some alternative embodiments, different first electrodes 21 are connected to different first connecting electrodes 41; different reflective electrodes 30 are connected to different second connecting electrodes 42. Different first connecting electrodes 41 are connected to different signal ports, while different second connecting electrodes 42 can be connected to different signal ports or the same signal port; no specific limitation is made here.

[0050] In some alternative embodiments, please refer to Figure 1 The orthographic projection of the reflective electrode 30 on the substrate 10 covers and extends beyond the orthographic projection of the second connecting electrode 42 on the substrate 10. The second connecting electrode 42 is directly below the reflective electrode 30 and is electrically connected to the reflective electrode 30. The potentials of the second connecting electrode 42 and the reflective electrode 30 are the same, thus avoiding the generation of coupling capacitance between them.

[0051] In some alternative embodiments, please refer to Figure 1 The orthographic projection of the reflective electrode 30 on the substrate 10 is spaced apart from the orthographic projection of the first connecting electrode 41 on the substrate 10. Since the first connecting electrode 41 is electrically connected to the first electrode 21, but not electrically connected to the reflective electrode 30, a potential difference exists between them. If the reflective electrode 30 and the first connecting electrode 41 are directly opposite each other, coupling capacitance can easily form between them. By spaced apart the orthographic projections of the reflective electrode 30 and the first connecting electrode 41 on the substrate 10, the risk of coupling capacitance forming between them can be reduced.

[0052] In some alternative embodiments, please refer to Figure 1 In this design, the distance from the first electrode 21 of all light-emitting devices 20 to the substrate 10 is the same. That is, all first electrodes 21 are located at the same height, and the distance from the second electrode 23 to the first electrode 21 is the same, which helps improve the flatness of the display substrate. Setting all light-emitting devices 20 at the same height reduces the risk of leakage current caused by height differences between light-emitting devices 20 of different colors, thus improving the operational stability of the light-emitting devices 20.

[0053] In some alternative embodiments, please refer to Figure 1Multiple light-emitting devices 20 have various colors. The distance from the first electrode 21 to the corresponding reflective electrode 30 is different for light-emitting devices 20 of different colors, while the distance from the first electrode 21 to the corresponding reflective electrode 30 is the same for light-emitting devices 20 of the same color. Because the wavelengths of the light emitted by the light-emitting devices 20 of different colors are different, the distances from the first electrode 21 to the corresponding reflective electrode 30 of the light-emitting devices 20 of different colors are set differently so that the optimal resonant frequency of the optical resonant cavity matches the wavelength of the light emitted by the light-emitting device 20, thereby improving 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 its corresponding reflective electrode 30 is greater than that of the green light-emitting device; the distance from the first electrode 21 of the green light-emitting device to its corresponding reflective electrode 30 is greater than that of the blue light-emitting device. Since the optimal resonant frequencies of the optical resonators corresponding to the red, green, and blue light-emitting devices are different, the cavity lengths of the optical resonators for the three colors are also different. The cavity length of the optical resonator corresponding to the red light-emitting device is the longest, followed by the green light-emitting device, and the cavity length of the optical resonator corresponding to the blue light-emitting device is the shortest. Because the distance between the first electrode 21 and the second electrode 23 remains constant, the distance between the first electrode 21 and its corresponding reflective electrode 30 differs, which in turn makes the distance between the second electrode 23 and its corresponding reflective electrode 30 different, resulting in different cavity lengths for the optical resonators corresponding to the different colors of the light-emitting devices 20.

[0055] In some alternative embodiments, please refer to Figure 1 The display substrate also includes multiple 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 from the reflective electrode 30. By distributing the lens 50 between the first electrode 21 and the reflective electrode 30, the light emitted from the light-emitting layer 22 is collimated by the lens 50. The collimated light is more likely to undergo total internal reflection at the position of the reflective electrode 30, thereby increasing the intensity of the reflected light. The lens 50 converges the light reflected from the reflective electrode 30, increasing the intensity of the light emitted from the light-emitting device 20, improving the brightness of the light-emitting device 20, and mitigating the pixel crosstalk problem caused by 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 from the reflective electrode 30, it reduces the angle of the light emitted from the light-emitting device 20. The lens 50 has no restrictions on the shape of the pixel aperture, which is beneficial to improving the aperture ratio of the display substrate. In addition, the process of placing the lens 50 between the first electrode 21 and the reflective electrode 30 does not worsen the viewing angle of the light-emitting device 20.

[0057] In some alternative embodiments, please refer to 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 same distance from each lens 50 to the first electrode 21 ensures that the light reflected by the reflective electrode 30 is focused to the same degree after passing through the lens 50, thereby making the emission angles of different colored light-emitting devices 20 the same and improving the display effect of the display substrate.

[0058] In some alternative embodiments, the minimum distance from the first electrode 21 of each light-emitting device 20 to 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 abuts against the first electrode 21. 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 can be greater than 0. There is no specific limitation here, and the size of the minimum distance from the first electrode 21 to the corresponding lens 50 can be determined according to specific needs.

[0059] In some alternative 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 arrangement 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 helps to improve the light intensity emitted by the light-emitting device 20.

[0060] In some alternative embodiments, the plurality of light-emitting devices 20 include blue light-emitting devices that emit 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. Depending on actual needs, the reflective electrode 30 and the lens 50 can be fitted together.

[0061] In some alternative embodiments, the refractive index of the lens 50 is greater than 1.7, so that the light entering the lens 50 has a better focusing effect and a better brightness enhancement effect. For example, the material of the lens 50 is silicon nitride.

[0062] In some alternative embodiments, please refer to Figure 1 The display substrate also 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 connecting electrode 41 through the first conductive hole 61, and each reflective electrode 30 is connected to the corresponding second connecting electrode 42 through the second conductive hole 62. The first electrode 21 is connected to the first connecting electrode 41 through the first conductive hole 61, and the reflective electrode 30 is connected to the second connecting electrode 42 through the second conductive hole 62 to avoid interference between the reflective electrode 30 and the first electrode 21, and to help avoid coupling capacitance between the reflective electrode 30 and the driving circuit layer 40.

[0063] In some alternative embodiments, please refer to Figure 1 The display substrate also includes a pixel defining layer 70, which has a pixel opening 71. A portion of the light-emitting device 20 is located within the pixel opening 71. The orthographic projection of the pixel defining layer 70 on the substrate 10 covers and extends beyond the orthographic projection of the first conductive hole 61 on the substrate 10. This arrangement, where the pixel defining layer 70 covers the location of the first conductive hole 61, helps to reduce the impact of the first conductive hole 61 on the flatness of the first electrode 21 within the pixel opening 71, thereby improving the operational stability of the light-emitting device 20.

[0064] In some alternative embodiments, please refer to Figure 1 The orthographic projection of the pixel defining layer 70 on the substrate 10 is spaced apart from the orthographic projection of the second conductive hole 62 on the substrate 10. Alternatively, the orthographic projection of the pixel opening 71 on the substrate 10 covers and extends beyond the orthographic projection of the second conductive hole 62 on the substrate 10.

[0065] In some alternative embodiments, please refer to Figure 2 The orthogonal projection of the pixel limiting layer 70 on the substrate 10 covers and extends beyond the orthogonal projection of the second conductive hole 62 on the substrate 10.

[0066] In some alternative embodiments, please refer to Figure 2The pixel opening 71 has a polygonal cross-section in the direction parallel to the substrate 10, and the first conductive hole 61 is located outside the pixel opening 71 and near one corner of the polygon. This arrangement helps the pixel defining layer 70 cover the portion of the first electrode 21 that contacts the first conductive hole 61, thereby ensuring the flatness of the first electrode 21 within the pixel opening 71. For example, the pixel opening 71 has a hexagonal cross-section in the direction parallel to the substrate 10.

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

[0068] The edge of the orthographic projection of the surface of the second pixel sublayer 73 facing the substrate 10 onto 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 onto the substrate 10.

[0069] The orthographic projection of the surface of the third pixel sublayer 74 facing the substrate 10 onto the substrate 10 covers and extends the orthographic projection of the surface of the second pixel sublayer 73 away from the substrate 10 onto the substrate 10, and the edge of the orthographic projection of the surface of the second pixel sublayer 73 away from the substrate 10 onto the substrate 10 is located inside the edge of the orthographic projection of the surface of the third pixel sublayer 74 facing the substrate 10 onto the substrate 10.

[0070] By configuring the first pixel sub-layer 72, the second pixel sub-layer 73, and the third pixel sub-layer 74 at the pixel opening 71 to form an undercut structure, it is beneficial to isolate two adjacent light-emitting devices 20 and avoid crosstalk between them. In addition, this configuration can also increase the aperture ratio, reduce the impact of color shift, and improve lifespan.

[0071] In some optional embodiments, the step difference L1 between the first pixel sub-layer 72 and the third pixel sub-layer 74 in the direction parallel to the display substrate is greater than or equal to 0.01µm and less than or equal to 0.03µm. If the step difference L1 between the first pixel sub-layer 72 and the third pixel sub-layer 74 in the direction parallel to the display substrate is greater than 0.03µm, it can easily lead to the failure of the undercut structure. If the step difference L1 between the first pixel sub-layer 72 and the third pixel sub-layer 74 in the direction parallel to the display substrate is less than 0.01µm, the third pixel sub-layer 74 can easily block the first electrode 21.

[0072] In some alternative 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 μm and less than 0.11 μm. This arrangement facilitates the undercut structure to isolate the first electrodes 21 of two adjacent light-emitting devices 20.

[0073] In some alternative embodiments, the width L3 of the pixel defining layer 70 covering the first electrode 21 is greater than or equal to 0.4 μm and less than or equal to 0.6 μm. This arrangement helps to ensure the contact area between the first electrode 21 and the light-emitting layer 22, while ensuring the stable operation of the first electrode 21.

[0074] In some alternative embodiments, the distance D1 between two adjacent first electrodes 21 is greater than or equal to 0.2 μm and less than or equal to 0.6 μm. If the distance D1 between two adjacent first electrodes 21 is less than 0.2 μm, interference between the first electrodes 21 is likely to occur. If the distance D1 between two adjacent first electrodes 21 is greater than 0.6 μm, the aperture ratio is likely to decrease. Limiting the distance D1 between two adjacent first electrodes 21 to the range of 0.2 μm to 0.6 μm increases the aperture ratio of the display substrate while ensuring that there is no interference between the two adjacent first electrodes 21.

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

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

[0077] In some alternative 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 being located on the side of the first reflective metal layer 31 facing the substrate 10, the thickness H5 of the first reflective metal layer 31 being greater than or equal to 500 Am and less than or equal to 3000 Am, and the thickness H6 of the second reflective metal layer 32 being greater than or equal to 100 Am and less than or equal to 1000 Am.

[0078] In some alternative 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 alternative embodiments, the light-emitting device 20, the reflective electrode 30, and the driving circuit layer 40 are integrated on the substrate 10. For example, the 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 this disclosure, a display device is provided, including the display substrate described above.

[0081] Figures 3a to 3n This is a flowchart illustrating the fabrication process of the display substrate disclosed herein. Figure 3a As shown, a driving circuit layer 40 is formed on the substrate 10, and the first connecting electrode 41 and the second connecting electrode 42 are independent of each other.

[0082] A second metal material and a first metal material are sequentially deposited on a substrate 10 by sputtering, forming a second metal layer 321 and a first metal layer 311. (See [link to relevant documentation]). Figure 3b A first photoresist layer 80 with a first shape is coated on the first metal layer 311. A reflective electrode 30 corresponding to the first color light-emitting device 20 is formed through a first patterning process. In the reflective electrode 30 formed by the patterning process, the first metal layer 311 is retained as the first reflective metal layer 31, and the second metal layer 321 is retained as the second reflective metal layer 32. (See also...) Figure 3c and Figure 3d For example, the first metallic material is titanium, and the second metallic material is 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). (See [link to relevant documentation]). Figure 3e The deposited insulating material layer is then smoothed using a CMP (chemical mechanical polishing) process. (See also...) Figure 3f After the insulating material layer has been smoothed, a second conductive hole 62 corresponding to the reflective electrode 30 is formed through a single patterning process. The reflective electrode 30 corresponds to the light-emitting device 20 of the second color. (See [link to relevant documentation]). Figures 3g to 3j The specific fabrication steps are as follows: a second photoresist layer 100 with a second shape is formed on the smoothed insulating material layer. Please refer to [link to relevant documentation]. Figure 3g Then, exposure, development, and etching are performed to form... Figure 3h The hole structure is shown. For filling the hole structure with metal, please refer to [reference needed]. Figure 3i For example, a filler metal dock. The metal above the insulating layer is ground down using a CMP process until the insulating layer is exposed. See [link to relevant documentation]. Figure 3j .

[0084] A reflective electrode 30 is formed corresponding to the light-emitting device 20 of the second color. (See also...) Figure 3k .

[0085] A reflective electrode 30 is formed corresponding to the light-emitting device 20 of the third color. (See also...) Figure 3l .

[0086] A lens material layer 110 is formed, and multiple lenses 50 are formed on the lens material layer 110 through coating, exposure, development, and transfer mold 120. Insulating material is deposited in the gaps between the lenses 50, and the final insulating material layer serves as the insulating layer 60. Please refer to [link to documentation]. Figure 3m and Figure 3n For example, the insulating material is SiOx.

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

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

Claims

1. A display substrate, characterized in that, include: Substrate; A plurality of light-emitting devices are disposed on the substrate, and each light-emitting device includes a first electrode, a light-emitting layer and a second electrode arranged sequentially along a direction away from the substrate. Multiple reflective electrodes are located between the first electrode and the substrate and are spaced apart from the first electrode. The reflective electrodes are configured to reflect light emitted by the corresponding light-emitting device in a direction away from the substrate. A driving circuit layer is located between the reflective electrode and the substrate. The driving circuit layer includes a plurality of first connection electrodes and a plurality of second connection electrodes. The first electrodes are connected to the first connection electrodes, the reflective electrode is connected to the second connection electrodes, the first connection electrodes and the second connection electrodes are independent of each other, and the second connection electrodes are connected to a preset ground point on the driving circuit layer. The display substrate further includes a plurality of lenses, and at least one of the lenses is disposed between the first electrode of the light-emitting device and the corresponding reflective electrode, the lens being configured to converge the light reflected by the reflective electrode; The display substrate further includes an insulating layer disposed between the driving circuit layer and the first electrode, and the reflective electrode and the lens are embedded in the insulating 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 reflective electrodes are connected to different second connecting electrodes.

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

5. The display substrate according to claim 1, characterized in that, The plurality of light-emitting devices have multiple colors. The distance from the first electrode of the light-emitting device of different colors to the corresponding reflective electrode is different, while the distance from the first electrode of the light-emitting device of the same color to the corresponding reflective electrode is 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 that emits red light, a green light-emitting device that emits green light, and a blue light-emitting device that emits 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 distance from the first electrode of all the light-emitting devices to the substrate is the same.

8. The display substrate according to any one of claims 1 to 7, characterized in that, 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.

9. The display substrate according to claim 8, characterized in that, The minimum distance from the first electrode of each of the light-emitting devices to the corresponding lens is greater than or equal to 0.

10. The display substrate according to claim 8, characterized in that, The surface of the lens facing the light-emitting device is convex, and the surface of the lens facing the reflective electrode is flat.

11. The display substrate according to claim 10, characterized in that, The plurality of light-emitting devices include a blue light-emitting device that emits blue light, and the surface of the lens corresponding to the blue light-emitting device facing the substrate is in contact with the corresponding reflective electrode.

12. The display substrate according to any one of claims 1 to 7, characterized in that, The lens is made of a material with a refractive index greater than 1.

7.

13. The display substrate according to any one of claims 1 to 7, characterized in that, The insulating layer has a plurality of first conductive holes and a plurality of second conductive holes. Each first electrode is connected to the corresponding first connecting electrode through the first conductive hole, and each reflective electrode is connected to the corresponding second connecting electrode through the second conductive hole.

14. The display substrate according to claim 13, characterized in that, The display substrate further includes a pixel defining layer, the pixel defining layer having pixel openings, and a portion of the light-emitting device is located within the pixel openings. The orthogonal projection of the pixel defining layer on the substrate covers and extends beyond the orthogonal projection of the first conductive hole on the substrate.

15. The display substrate according to claim 14, characterized in that, The pixel opening has a polygonal cross-section parallel to the substrate direction, and the first conductive hole is located outside the pixel opening and near one corner of the polygon.

16. The display substrate according to claim 15, characterized in that, The pixel defining layer includes a first pixel sub-layer, a second pixel sub-layer, and a third pixel sub-layer sequentially stacked in a direction away from the substrate, wherein; The edge of the orthogonal projection of the surface of the second pixel sublayer facing the substrate onto the substrate is located inside the edge of the orthogonal projection of the surface of the first pixel sublayer away from the substrate onto the substrate. The orthographic projection of the surface of the third pixel sublayer facing the substrate onto the substrate covers and extends the orthographic projection of the surface of the second pixel sublayer away from the substrate onto the substrate, and the edge of the orthographic projection of the surface of the second pixel sublayer away from the substrate onto the substrate is located inside the edge of the orthographic projection of the surface of the third pixel sublayer facing the substrate onto the substrate.

17. 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 substrate.

18. A display device, characterized in that, The display substrate includes any one of claims 1 to 17.

Images