Display panel, preparation method of display panel and display device

Abstract

The invention discloses a display panel, a preparation method of the display panel and a display device. The display panel comprises a back plate and a plurality of light-emitting elements located on one side of the back plate. The back plate comprises a substrate and a micro-mechanical structure located on the side, close to the light-emitting element, of the substrate, the micro-mechanical structure comprises a reflecting electrode and a control electrode, the first end of the reflecting electrode is arranged in the back plate, the second end of the reflecting electrode is arranged on the side, close to the light-emitting element, of the back plate, and the control electrode is located on the side, close to the light-emitting element, of the substrate; the voltage difference between the reflecting electrode and the control electrode is a first voltage difference, and the reflecting electrode enables part of light of the light-emitting element to be emitted at a first emitting angle; the voltage difference between the reflecting electrode and the control electrode is a second voltage difference, and the reflecting electrode enables part of light of the light-emitting element to be emitted at a second emitting angle. According to the technical scheme, the micro-mechanical structure is arranged in the display panel, the light emitting angle can be adjusted according to requirements, and the application scene of the display panel is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of display panels, and in particular to a display panel, a method for preparing a display panel, and a display device. Background Art

[0002] In order to increase the amount of light emitted from the front of the display panel, the prior art LED display panel often sets a fixed light reflection structure on the side of the display panel so that the light emitted from the side of the display panel is reflected to the front through the light reflection structure. However, this method affects the side light emission of the display panel and can only cope with applications with narrow viewing angles. Summary of the invention

[0003] The present invention provides a display panel, a method for preparing the display panel and a display device, so as to solve the problem in the prior art that due to the fixed light reflection structure, only the light output can be satisfied while the viewing angle of the display panel is ignored, thereby resulting in a single application scenario of the display panel.

[0004] According to a first aspect of the present invention, there is provided a display panel, comprising a backplane and a plurality of light emitting elements located on one side of the backplane;

[0005] The back plate includes a substrate and a micromechanical structure located on a side of the substrate close to the light-emitting element, the micromechanical structure includes a reflective electrode and a control electrode, the first end of the reflective electrode is arranged in the back plate, the second end of the reflective electrode is arranged on a side of the back plate close to the light-emitting element, and the control electrode is located on a side of the substrate close to the light-emitting element;

[0006] The voltage difference between the reflective electrode and the control electrode is a first voltage difference, and the reflective electrode causes part of the light of the light emitting element to be emitted at a first emission angle;

[0007] The voltage difference between the reflective electrode and the control electrode is a second voltage difference, and the reflective electrode causes part of the light of the light emitting element to be emitted at a second emission angle;

[0008] The first voltage difference is not equal to the second voltage difference; the first emission angle is not equal to the second emission angle.

[0009] According to a second aspect of the present invention, there is provided a method for preparing a display panel, which is used to prepare the display panel of the first aspect, and the preparation method comprises:

[0010] Provide back panel;

[0011] forming a micromechanical structure and a light-emitting element on one side of the back plate;

[0012] The micromechanical structure includes a reflective electrode and a control electrode, wherein the first end of the reflective electrode is arranged in the back plate, the second end of the reflective electrode is arranged on the side of the back plate close to the light-emitting element, and the control electrode is located on the side of the substrate close to the light-emitting element; the voltage difference between the reflective electrode and the control electrode is a first voltage difference, and the reflective electrode causes part of the light of the light-emitting element to be emitted at a first emission angle; the voltage difference between the reflective electrode and the control electrode is a second voltage difference, and the reflective electrode causes part of the light of the light-emitting element to be emitted at a second emission angle; wherein the first voltage difference is not equal to the second voltage difference; and the first emission angle is not equal to the second emission angle.

[0013] According to a third aspect of the present invention, a display device is provided, comprising the display panel according to the first aspect.

[0014] The technical solution of the present invention, by setting a micromechanical structure in the display panel and controlling the voltage difference between the reflective electrode and the control electrode of the micromechanical structure, can adjust the voltage difference according to the needs of different application scenarios and then adjust the angle between the reflective electrode and the plane where the substrate is located, thereby changing the emission angle of part of the light of the light-emitting element. This can not only increase the light output of the display panel in some application scenarios, but also expand the viewing angle of the display panel in some application scenarios, thereby ensuring the display effect of the display panel and expanding the application scenarios of the display panel.

[0015] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a cross-sectional schematic diagram of a first display panel provided according to an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional schematic diagram of a second display panel provided according to an embodiment of the present invention;

[0019] Figure 3 is a cross-sectional schematic diagram of a third display panel provided according to an embodiment of the present invention;

[0020] Figure 4 is a cross-sectional schematic diagram of a fourth display panel provided according to an embodiment of the present invention;

[0021] Figure 5 is a schematic top view of a first display panel provided according to an embodiment of the present invention;

[0022] Figure 6 is a schematic top view of a second display panel provided according to an embodiment of the present invention;

[0023] Figure 7 is a top view schematic diagram of a third display panel provided according to an embodiment of the present invention;

[0024] Figure 8 is a schematic top view of a fourth display panel provided according to an embodiment of the present invention;

[0025] Fig. 9 is a top view schematic diagram of a fifth display panel provided according to an embodiment of the present invention;

[0026] Fig.10 is a flow chart of a method for preparing a first display panel provided according to an embodiment of the present invention;

[0027] Fig.11 is a structural diagram corresponding to a first method for preparing a display panel provided in an embodiment of the present invention;

[0028] Fig.12 is a flow chart of a second method for preparing a display panel provided in an embodiment of the present invention;

[0029] Fig.13 is a structural diagram corresponding to a second method for preparing a display panel provided in an embodiment of the present invention;

[0030] Fig.14 is a flow chart of a third method for preparing a display panel provided according to an embodiment of the present invention;

[0031] Fig.15 is a structural diagram corresponding to a third method for preparing a display panel provided in an embodiment of the present invention;

[0032] Fig.16 is a schematic structural diagram of a display device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Figure 1 FIG. 1 is a cross-sectional schematic diagram of a first display panel provided according to an embodiment of the present invention. Figure 1 As shown, the display panel includes:

[0036] A back panel 1 and a plurality of light emitting elements 2 ( Figure 1 Only one light emitting element 2 is schematically shown;

[0037] The back plate 1 includes a substrate 11 and a micromechanical structure 3 located on a side of the substrate 11 close to the light emitting element 2. The micromechanical structure 3 includes a reflective electrode 31 and a control electrode 32. The first end of the reflective electrode 31 is arranged in the back plate 1, the second end of the reflective electrode 31 is arranged on a side of the back plate 1 close to the light emitting element 2, and the control electrode 32 is located on a side of the substrate 11 close to the light emitting element 2.

[0038] The voltage difference between the reflective electrode 31 and the control electrode 32 is a first voltage difference, and the reflective electrode 31 causes part of the light of the light emitting element 2 to be emitted at a first emission angle a;

[0039] The voltage difference between the reflective electrode 31 and the control electrode 32 is a second voltage difference, and the reflective electrode 31 causes part of the light of the light emitting element 2 to be emitted at a second emission angle b;

[0040] The first voltage difference is not equal to the second voltage difference; the first emission angle a is not equal to the second emission angle b.

[0041] The backplane 1 provided in the display panel includes a substrate 11 and may also include a driving circuit, which is provided in the backplane 1. The light-emitting element 2 may be a light-emitting diode (LED) chip, and the light-emitting element 2 may be a Micro-LED or a mini-LED. The light-emitting element 2 is provided on one side of the backplane 1 and is electrically connected to the driving circuit in the backplane 1, and the light-emitting element 2 is controlled to emit light by the driving circuit.

[0042] Among them, the back plate 1 also includes a micromechanical structure 3, which can be made of a metal conductive material, is arranged on one side of the light-emitting element 2, and includes a reflective electrode 31 and a control electrode 32. The first end of the reflective electrode 31 is arranged in the back plate 1, and the back plate 1 plays a role in fixing the reflective electrode 31, and the second end is suspended and arranged on the side of the back plate 1 close to the light-emitting element 2. The control electrode 32 is arranged on the substrate 11 in the back plate 1 and close to the side of the light-emitting element 2. Since the reflective electrode 31 and the control electrode 32 are both made of conductive materials, different voltages are applied to the reflective electrode 31 and the control electrode 32 respectively. Due to the existence of the voltage difference, the reflective electrode 31 and the control electrode 32 will interact with each other due to the electric field. Since the control electrode 32 is fixedly arranged on the substrate 11, one end of the reflective electrode 31 is fixed on the back plate 1, and the other end is suspended. Therefore, when the voltage difference between the control electrode 32 and the reflective electrode 31 is different, the angle between the reflective electrode 31 and the plane where the substrate 11 is located will be different, thereby making the reflective electrode 31 receive and reflect the light of the light-emitting element 2 at different exit angles. In some embodiments, the reflective structure may be a stretchable spring structure to facilitate controlling its angle.

[0043] Specifically, when there is a first voltage difference between the reflective electrode 31 and the control electrode 32, a first force is generated between the reflective electrode 31 and the control electrode 32 based on the first voltage difference, and the first force makes the angle between the reflective electrode 31 and the plane where the substrate 11 is located to be a first angle, and the reflective electrode 31 receives part of the light emitted by the light-emitting element 2 and emits it at a first emission angle a; when there is a second voltage difference between the reflective electrode 31 and the control electrode 32, a second force is generated between the reflective electrode 31 and the control electrode 32 based on the second voltage difference, and the second force makes the angle between the reflective electrode 31 and the plane where the substrate 11 is located to be a second angle, and the reflective electrode 31 receives part of the light emitted by the light-emitting element 2 and emits it at a second emission angle b. Therefore, the emission angle of part of the light of the light-emitting element 2 can be controlled by controlling the voltage difference between the reflective electrode 31 and the control electrode 32, thereby changing the wide and narrow viewing angles of the light-emitting element 2.

[0044] It is understandable that the control electrode 32 and the reflective electrode 31 may be applied with voltages of the same polarity or voltages of different polarities. Due to the existence of different voltage differences, there are different repulsive forces between voltages of the same polarity, thereby changing the angle between the reflective electrode 31 and the plane where the substrate 11 is located, or due to the existence of different voltage differences, there are different attractive forces between voltages of different polarities, thereby changing the angle between the reflective electrode 31 and the plane where the substrate 11 is located.

[0045] The technical solution of the embodiment of the present invention, by setting a micromechanical structure in the display panel and controlling the voltage difference between the reflective electrode and the control electrode of the micromechanical structure, can adjust the voltage difference according to the needs of different application scenarios and then adjust the angle between the reflective electrode and the plane where the substrate is located, thereby changing the emission angle of part of the light of the light-emitting element. This can not only increase the light output of the display panel in some application scenarios, but also expand the viewing angle of the display panel in some application scenarios, thereby ensuring the display effect of the display panel and expanding the application scenarios of the display panel.

[0046] Optional, continue to refer to Figure 1 As shown, the first voltage difference is greater than the second voltage difference, and the first emission angle a is less than the second emission angle b.

[0047] Among them, an electric field of different polarities can be set between the control electrode 32 and the reflective electrode 31. When the voltage difference applied between the control electrode 32 and the reflective electrode 31 is larger, the interaction force between the control electrode 32 and the reflective electrode 31 is larger, and the reflective electrode 31 is closer to the position of the control electrode 32, thereby reducing the acute angle between the reflective electrode 31 and the plane where the substrate 11 is located.

[0048] Exemplarily, when there is a first voltage difference between the reflective electrode 31 and the control electrode 32, a first force is generated between the reflective electrode 31 and the control electrode 32 based on the first voltage difference, and the first force makes the angle between the reflective electrode 31 and the plane where the substrate 11 is located to be a first angle, and the reflective electrode 31 receives part of the light emitted by the light-emitting element 2 and emits it at the first emission angle a; when there is a second voltage difference smaller than the first voltage difference between the reflective electrode 31 and the control electrode 32, a second force is generated between the reflective electrode 31 and the control electrode 32 based on the second voltage difference, and the second force is smaller than the first force, and the second force makes the angle between the reflective electrode 31 and the plane where the substrate 11 is located to be a second angle, and the reflective electrode 31 receives part of the light emitted by the light-emitting element 2 and emits it at the second emission angle b. Therefore, based on the principle of light reflection, the first emission angle a is smaller than the second emission angle b, so as to adjust the emission angle of the light, thereby changing the light emission amount and viewing angle of the display panel. In specific implementation, the first voltage difference can be set to 0, and multiple voltage differences can be designed according to actual needs. In specific implementation, it can be designed according to actual conditions.

[0049] The technical solution of the embodiment of the present invention sets the first voltage difference to be greater than the second voltage difference, so that the reflective electrode receives part of the light from the light-emitting element at different angles, thereby making the first emission angle corresponding to the first voltage difference smaller than the second emission angle corresponding to the second voltage difference. Based on this standard, the light output of the display panel or the wide or narrow viewing angle of the display panel can be adjusted according to the application scenario to ensure the working effect of the display panel.

[0050] Optional, continue to refer to Figure 1 As shown, the projection of the reflective electrode 31 on the substrate 11 at least partially overlaps with the control electrode 32 .

[0051] Among them, since the angle between the reflective electrode 31 and the plane where the substrate 11 is located is controlled by the electric field between the reflective electrode 31 and the control electrode 32, making the projection of the reflective electrode 31 on the substrate 11 at least partially overlap with the control electrode 32 is beneficial to ensure that when voltages are applied to both, the reflective electrode 31 and the control electrode 32 can interact with each other according to the voltage difference.

[0052] It is understandable that the more the projection of the reflective electrode 31 on the substrate 11 overlaps with the control electrode 32, the better the control effect. Figure 1 As shown, the overlapping area of ​​the projection of the reflective electrode 31 on the substrate 11 and the control electrode 32 is greater than or equal to 50% of the projection area of ​​the control electrode 32 on the substrate 11. Such a configuration further ensures that when a voltage is applied to the reflective electrode 31 and the control electrode 32, the reflective electrode 31 and the control electrode 32 can interact with each other according to the voltage difference, thereby ensuring the control effect of the reflective electrode 31.

[0053] The technical solution of the embodiment of the present invention is to set the projection of the reflective electrode on the substrate to at least partially overlap with the control electrode, so that when a voltage is applied to the reflective electrode and the control electrode, the electric field of the reflective electrode is as close as possible to the electric field of the control electrode and interact with each other to change the angle between the reflective electrode and the plane where the substrate is located, thereby ensuring the control effect of the reflective electrode.

[0054] Optional, continue to refer to Figure 1 As shown, the backplane 1 also includes a passivation layer 12 located on the side of the substrate 11 close to the light-emitting element 2, the passivation layer 12 includes a first through hole 121, the reflective electrode 31 includes a fixed portion 311 and a deformation portion 312, the passivation layer 12 covers the fixed portion 311 and the control electrode 32, and the first end of the deformation portion 312 is connected to the fixed portion 311 through the first through hole 121.

[0055] Among them, the passivation layer 12 can be deposited on one side of the substrate 11 as a protective layer and a sacrificial layer. The passivation layer 12 is etched at the corresponding position to form a first through hole 121. The first through hole 121 exposes the fixed portion 311 of the reflective electrode 31. The deformable portion 312 of the reflective electrode 31 is connected to the fixed portion 311 through the first through hole 121, thereby achieving the fixation of the first end of the reflective electrode 31 and the suspension of the second end. Since the fixed portion 311 and the control electrode 32 are both arranged on one side of the substrate 11, the passivation layer 12 also covers the control electrode 32. The projection of the deformable portion 312 connected to the fixed portion 311 on the substrate 11 covers the control electrode 32, thereby ensuring the control effect of the reflective electrode 31, thereby completing the preparation of the control electrode 32 and the reflective electrode 31.

[0056] Specifically, the fixed portion 311 and the control electrode 32 of the reflective electrode 31 are deposited on one side of the substrate 11, and the passivation layer 12 is further deposited on one side of the substrate 11, and the passivation layer 12 covers the fixed portion 311 and the control electrode 32; the passivation layer 12 is etched to form a first through hole 121, and the first through hole 121 exposes the fixed portion 311; the deformation portion 312 of the reflective electrode 31 is prepared on one side of the passivation layer 12, and the first end of the deformation portion 312 is connected to the fixed portion 311 through the first through hole 121, and the other end is suspended and the projection of the deformation portion 312 on the substrate 11 covers the control electrode 32.

[0057] The technical solution of the embodiment of the present invention is to provide a passivation layer on one side of the substrate, the passivation layer covers the fixed part and the control electrode, and a first through hole is provided on the passivation layer, so that the deformation part of the reflective electrode is connected to the fixed part through the first through hole, thereby ensuring the preparation of the reflective electrode and the control electrode and improving the reliability of the reflective electrode and the control electrode.

[0058] Optional, Figure 2 is a cross-sectional schematic diagram of a second display panel provided according to an embodiment of the present invention, such as Figure 2 As shown, the light emitting element 2 includes an electrode 21 and a light emitting portion 22 , the projection of the edge of the light emitting portion 22 on the substrate 11 is located within the projection of the electrode 21 on the substrate 11 , and the electrode 21 is reused as a control electrode 32 .

[0059] The electrodes 21 in the light-emitting element 2 are respectively connected to the light-emitting portion 22 and the driving circuit in the back plate 1 , and the light-emitting portion 22 is controlled to emit light through the driving circuit.

[0060] Among them, the electrode 21 can be reused as the control electrode 32, that is, the electrode 21 in the light-emitting element 2 and the reflective electrode 31 generate a voltage difference and interact with each other. In order to ensure the effect of the interaction between the electrode 21 in the light-emitting element 2 and the reflective electrode 31, it is necessary to minimize the distance between the reflective electrode 31 and the electrode 21 of the light-emitting element 2, and it is necessary to ensure the normal operation of the light-emitting element 2, so the projection of the edge of the light-emitting portion 22 on the substrate 11 is set to be located within the projection of the electrode 21 on the substrate 11, that is, the projection of the electrode 21 on the substrate 11 and the projection of the edge of the light-emitting portion 22 on the substrate 11 partially overlap, and partially do not overlap, so that the electrode 21 is closer to the reflective electrode 31, and the control effect of the reflective electrode 31 is ensured. In some embodiments, the minimum distance L between the reflective electrode 31 and the control electrode 32 is greater than or equal to 2μm and less than or equal to 10μm. Since the electrode of the light-emitting element 2 is reused as the control electrode 32, considering the process feasibility, the minimum distance L between the reflective electrode 31 and the control electrode 32 can be greater than or equal to 2μm and less than or equal to 10μm, which not only ensures the normal operation of the light-emitting element 2, but also ensures the distance between the electrode 21 of the light-emitting element 2 and the reflective electrode 31, thereby ensuring the normal operation of the display panel.

[0061] It can be understood that since the electrode of the light-emitting element 2 needs to ensure the normal operation of the light-emitting element 2, the voltage of the electrode 21 is often a fixed voltage. At this time, it is only necessary to change the voltage of the reflective electrode 31 to change the voltage difference between the electrode 21 of the light-emitting element 2 and the reflective electrode 31, thereby adjusting the angle between the reflective electrode 31 and the plane where the substrate 11 is located, and then adjusting the light emission angle.

[0062] Specifically, the light emitting element 2 is arranged on one side of the back plate 1, the electrode 21 of the light emitting element 2 is connected to the light emitting portion 22 and the driving circuit in the back plate 1, the projection of the edge of the light emitting portion 22 on the substrate 11 is located within the projection of the electrode 21 on the substrate 11, and the reflective electrode 31 is arranged on both sides of the light emitting element 2 and one end is fixedly arranged in the back plate 1. Since the reflective electrode 31 is arranged on both sides of the light emitting element 2 and the projection of the edge of the light emitting portion 22 on the substrate 11 is located within the projection of the electrode 21 on the substrate 11, when there is a voltage difference between the reflective electrode 31 and the electrode 21 of the light emitting element 2, the reflective electrode 31 and the electrode 21 of the light emitting element 2 will interact with each other, change the angle between the reflective electrode 31 and the plane where the substrate 11 is located, and then change the angle at which the reflective electrode 31 reflects the light reflected by the light emitting element 2, change the emission angle, and adjust the light output and viewing angle of the display panel.

[0063] The technical solution of the embodiment of the present invention reuses the electrode of the light-emitting element as the control electrode, so that when controlling the angle of the reflective electrode, it is only necessary to change the voltage of the reflective electrode to change the voltage difference between the reflective electrode and the electrode of the light-emitting element, thereby achieving control of the light output and viewing angle of the display panel, ensuring the function of the display panel while simplifying the structure of the display panel.

[0064] Optional, continue to refer to Figure 2 As shown, the backplane 1 also includes a passivation layer 12 located on the side of the substrate 11 close to the light-emitting element 2, the passivation layer 12 includes a first through hole 121, the reflective electrode 31 includes a fixed portion 311 and a deformation portion 312, the passivation layer 12 covers the fixed portion 311, and the first end of the deformation portion 312 is connected to the fixed portion 311 through the first through hole 121.

[0065] Among them, the passivation layer 12 can be a protective layer or a sacrificial layer deposited on one side of the substrate 11. The passivation layer 12 is etched at the corresponding position to form a first through hole 121. The first through hole 121 exposes the fixed portion 311 of the reflective electrode 31. The deformable portion 312 of the reflective electrode 31 is connected to the fixed portion 311 through the first through hole 121, thereby achieving the fixation of the first end of the reflective electrode 31 and the suspension of the second end. Since the electrode of the light-emitting element 2 is reused as the control electrode 32, the passivation layer 12 only covers the fixed portion 311, and there is no need to prepare the control electrode 32 on the substrate 11, thereby completing the preparation of the control electrode 32 and the reflective electrode 31.

[0066] Specifically, the fixed portion 311 of the reflective electrode 31 is deposited on one side of the substrate 11, and the passivation layer 12 is further deposited on one side of the substrate 11, and the passivation layer 12 covers the fixed portion 311; the passivation layer 12 is etched to form a first through hole 121, and the first through hole 121 exposes the fixed portion 311; the deformation portion 312 of the reflective electrode 31 is prepared on one side of the passivation layer 12, and the first end of the deformation portion 312 is connected to the fixed portion 311 through the first through hole 121, and the other end is suspended.

[0067] The technical solution of the embodiment of the present invention is to provide a passivation layer on one side of the substrate, the passivation layer covers the fixed part, and a first through hole is provided on the passivation layer, so that the deformation part of the reflective electrode is connected to the fixed part through the first through hole, thereby ensuring the preparation of the reflective electrode and eliminating the need to prepare the control electrode, thereby improving the reliability of the reflective electrode and the control electrode.

[0068] Optional, continue to refer to Figure 2 As shown, the depth h of the first through hole 121 is greater than or equal to 3 μm and less than or equal to 5 μm.

[0069] Among them, since the first end of the deformation portion 312 is connected to the fixed portion 311 through the first through hole 121, the deformation portion 312 is partially in contact with the passivation layer 12. When the angle of the deformation portion 312 changes due to the action of the electric field, the connection between the deformation portion 312 and the fixed portion 311 and the contact between the deformation portion 312 and the passivation layer 12 both support the deformation portion 312 as a whole, preventing the deformation portion 312 from breaking during the angle change process. In the embodiment of the present invention, the depth h of the first through hole 121 is set to be greater than or equal to 3μm and less than or equal to 5μm, so that the deformation portion 312 maintains a certain contact area with the passivation layer 12, avoiding that the contact area is too small to cause a small support effect, thereby affecting the reliability of the deformation portion 312.

[0070] It is understandable that the thickness of the passivation layer 12 should not be too thick, as too thick will affect the distance between the electric field of the control electrode 32 and the reflective electrode 31 , thereby affecting the control effect of the reflective electrode 31 .

[0071] The technical solution of the embodiment of the present invention, by setting the depth of the first through hole to be greater than or equal to 3μm and less than or equal to 5μm, ensures that there is a certain contact area between the passivation layer and the deformation part on the basis of ensuring process feasibility, thereby supporting the deformation part and ensuring the reliability and control effect of the reflective electrode.

[0072] Optional, continue to refer to Figure 2 As shown, the dimension of the fixing portion 311 in the first direction y is greater than the dimension of the deformation portion 312 in the first direction y, and the first direction y is the thickness direction of the deformation portion 312 .

[0073] Among them, since the fixed part 311 plays a fixing role, the deformable part 312 can change the angle by the electric field force with the fixed part 311 as the fixed point, so the size of the fixed part 311 in the first direction y is set to be larger than the thickness of the deformable part 312, so that the fixed part 311 is fixed more firmly in the back panel 1, and the smaller thickness of the deformable part 312 is convenient for flexible angle change, thereby achieving the purpose of changing the light output and viewing angle of the display panel.

[0074] The technical solution of the embodiment of the present invention is to set the size of the fixing part in the first direction to be larger than the size of the deformation part in the first direction, so that the fixing part can be more firmly arranged in the back plate than the deformation part, thereby playing the role of fixing the deformation part. The deformation part can be flexibly controlled and adjusted due to its smaller thickness, thereby improving the reliability of the display panel.

[0075] Optional, Figure 3 is a cross-sectional schematic diagram of a third display panel provided according to an embodiment of the present invention, such as Figure 3 As shown, the deformation portion 312 includes a first branch 3121 and a second branch 3122, the first end of the first branch 3121 is connected to the fixing portion 311, the second end of the first branch 3121 is connected to the first end of the second branch 3122, and the second end of the second branch 3122 is suspended.

[0076] The angles between the first branch 3121 and the second branch 3122 and the plane where the substrate 11 is located can be the same or different. The first end of the first branch 3121, i.e., the first end of the deformable portion 312, is connected to the fixed portion 311; the second end of the first branch 3121 is fixedly connected to the first end of the second branch 3122, and the second end of the second branch 3122 is suspended. When the angle of the deformable portion 312 changes, the angles between the first branch 3121 and the second branch 3122 and the plane where the substrate 11 is located change simultaneously.

[0077] Specifically, the angles between the first branch 3121 and the second branch 3122 and the plane where the substrate 11 is located can be set to be different, so that the emission angle of the light reflected by the first branch 3121 from the light-emitting element 2 is different from the emission angle of the light reflected by the second branch 3122 from the light-emitting element 2, thereby further changing the light output and viewing angle of the emitted light and expanding the application scenarios of the display panel.

[0078] The technical solution of the embodiment of the present invention is to set a first branch and a second branch in the deformation part, and the first branch is respectively connected to the fixed part and the second branch. When the angle between the reflective electrode and the plane where the substrate is located changes, the angle between the first branch and the second branch and the plane where the substrate is located also changes, thereby further changing the light output and viewing angle of the emitted light, thereby expanding the application scenarios of the display panel.

[0079] Optional, Figure 4is a cross-sectional schematic diagram of a fourth display panel provided according to an embodiment of the present invention, such as Figure 4 As shown, the height of the light emitting element 2 relative to the back plate 1 is d1, the height of the second end of the reflective electrode 31 relative to the back plate 1 is d2, and d2≥0.5d1.

[0080] Among them, since the light emitted by the light emitting element 2 includes the front and side, and the reflective electrode 31 is arranged on at least one side of the light emitting element 2, the height d1 of the light emitting element 2 relative to the back plate 1 and the height d2 of the second end of the reflective electrode 31 relative to the back plate 1 are set to satisfy d2≥0.5d1, so that the reflective electrode 31 can at least receive part of the light emitted from the side of the light emitting element 2 to reflect the side emitted light, thereby increasing the light output of the display panel.

[0081] In some embodiments, continue to refer to Figure 4 As shown, the height d1 of the light-emitting element 2 relative to the back plate 1 and the height d2 of the second end of the reflective electrode 31 relative to the back plate 1 are set to satisfy d2≥d1, so that the reflective electrode 31 can reflect all the light emitted from the side of the light-emitting element 2 to reflect all the side-emitting light, thereby increasing the light output of the display panel.

[0082] It can be understood that the higher the height of the second end of the reflective electrode 31 relative to the back plate 1, the greater the probability that the reflective electrode 31 receives the side light of the display panel. The height of the second end of the reflective electrode 31 relative to the back plate 1 can be obtained by changing the angle between the reflective electrode 31 and the plane where the substrate 11 is located. On the other hand, the size of the deformation portion 312 of the reflective electrode 31 can be increased, so that the height of the second end of the reflective electrode 31 relative to the back plate 1 is higher at the same angle. According to this principle, the light output of the display panel can be improved.

[0083] The technical solution of the embodiment of the present invention increases the probability of the reflective electrode receiving the side light of the light emitting element by limiting the relationship between the height d1 of the light emitting element relative to the back plate and the height d2 of the second end of the reflective electrode relative to the back plate, thereby adjusting the emission angle of the side light and improving the light output and viewing angle of the display panel.

[0084] Optional, Figure 5 is a schematic top view of a first display panel provided according to an embodiment of the present invention, Figure 6 is a schematic top view of a second display panel provided according to an embodiment of the present invention, Figure 7 is a top view schematic diagram of a third display panel provided according to an embodiment of the present invention, Figure 5 and Figure 6 As shown, the light emitting element 2 is arranged corresponding to the two micro-mechanical structures 3, and the reflective electrodes 31 of the two micro-mechanical structures 3 are respectively located on two opposite sides of the light emitting element 2; or as shown in FIG. Figure 7As shown, the light emitting element 2 is arranged corresponding to the four micro-mechanical structures 3, and the reflective electrodes 31 are arranged opposite to each other in pairs.

[0085] In order to adjust the emitting angle of the side light, a reflective electrode 31 corresponding to the micromechanical structure 3 can be set on both sides of the light emitting element 2, or a reflective electrode 31 and a control electrode 32 corresponding to the micromechanical structure 3 can be set on the four sides of the light emitting element 2.

[0086] It is understandable that when the electrode of the light emitting element 2 is reused as the control electrode 32 , the position of the reflective electrode 31 needs to be set according to the position of the electrode of the light emitting element 2 .

[0087] For example, Figure 5 As shown, a reflective electrode 31 and a control electrode 32 are respectively arranged on both sides of the light emitting element 2, and the reflective electrodes 31 are opposite to each other, and the control electrodes 32 are opposite to each other; or Figure 6 As shown, a reflective electrode 31 is provided on both sides of the light emitting element 2, and the electrodes of the light emitting element 2 are reused as control electrodes 32, and the reflective electrodes 31 are opposite to each other; or Figure 7 As shown, a reflective electrode 31 and a control electrode 32 are respectively disposed on the four sides of the light emitting element 2 , and the reflective electrodes 31 are opposed to each other in pairs, and the control electrodes 32 are opposed to each other in pairs.

[0088] The technical solution of the embodiment of the present invention is to provide reflective electrodes on both sides or four sides of the light-emitting element to ensure that the reflective electrodes reflect the light emitted from the side of the light-emitting element, thereby adjusting the light output and viewing angle of the display panel.

[0089] Optional, Figure 8 is a schematic top view of a fourth display panel provided according to an embodiment of the present invention, Fig. 9 is a top view schematic diagram of a fifth display panel provided according to an embodiment of the present invention, Figure 8 As shown, the display panel includes a plurality of pixel units 4, each pixel unit 4 includes at least two light emitting elements 2, the pixel unit 4 is arranged corresponding to two micromechanical structures 3, and the reflective electrodes 31 of the two micromechanical structures 3 are respectively located on two opposite sides of the pixel unit 4; or as Fig. 9 As shown, the pixel unit 4 is arranged corresponding to the four micro-mechanical structures 3, and the reflective electrodes 31 are arranged opposite to each other in pairs.

[0090] Among them, the pixel unit 4 includes at least two light-emitting elements 2, the two light-emitting elements 2 can be the same or different, and one pixel unit 4 can be regarded as a light output adjustment group. Then, two micromechanical structures 3 can be set on both sides of one pixel unit 4, and the two micromechanical structures 3 are opposite to each other, or four micromechanical structures 3 can be set in one pixel unit 4, and the four micromechanical structures 3 are opposite to each other.

[0091] It can be understood that the purpose of setting the micromechanical structure 3 around each pixel unit 4 is to adjust the light output and viewing angle of each pixel unit 4. The micromechanical structure 3 can be controlled individually or separately. The more micromechanical structures 3 are set, the more adjustable light can be achieved. It can be set according to different application scenarios, and the embodiments of the present invention are not limited to this.

[0092] For example, the pixel unit 4 may include a red light emitting element 2R, a green light emitting element 2G, and a blue light emitting element 2B arranged in an array. Figure 8 As shown, a micromechanical structure 3 is provided on the side of the red light emitting element 2R away from the green light emitting element 2G, and a micromechanical structure 3 is provided on the side of the blue light emitting element 2B away from the green light emitting element 2G. By adjusting the voltage difference between the corresponding reflective electrode 31 and the control electrode 32, the purpose of adjusting the light output of the pixel unit 4 is achieved. Fig. 9 As shown, the micromechanical structure 3 can be further arranged on the first side of the red light-emitting element 2R, the green light-emitting element 2G and the blue light-emitting element 2B, and the first side includes the side of the red light-emitting element 2R, the side of the green light-emitting element 2G and the side of the blue light-emitting element 2B. At the same time, the micromechanical structure 3 can be arranged on the second side opposite to the first side. In this way, the pixel unit 4 is arranged corresponding to the four micromechanical structures 3, and the reflective electrodes 31 are arranged opposite to each other in pairs. The voltage difference between the corresponding reflective electrode 31 and the control electrode 32 is adjusted respectively, so as to achieve the purpose of adjusting the light output of the pixel unit 4.

[0093] The technical solution of the embodiment of the present invention is to set at least two light-emitting elements in the pixel unit and make the pixel unit correspond to two micromechanical structures or four micromechanical structures, and adjust the light emitted from the side of each pixel unit by adjusting the micromechanical structure, so as to achieve the purpose of adjusting the light output and viewing angle of the display panel.

[0094] Based on the same inventive concept, Fig.10 is a flow chart of a method for preparing a first display panel according to an embodiment of the present invention. Fig.11 is a structural diagram corresponding to a first method for preparing a display panel provided in an embodiment of the present invention, such as Fig.10 and Fig.11 As shown, an embodiment of the present invention further provides a method for preparing a display panel, which is applied in a display panel. The preparation method includes:

[0095] S10, provide a backplane. Fig.11 As shown in step (k1) in FIG.

[0096] The backplane 1 disposed in the display panel includes a substrate 11 and may further include a driving circuit, and the driving circuit is disposed in the backplane 1 .

[0097] S11, forming a micromechanical structure and a light-emitting element on one side of the backplane. Fig.11 As shown in step (k2) in .

[0098] Among them, the micromechanical structure 3 includes a reflective electrode 31 and a control electrode 32, the first end of the reflective electrode 31 is arranged in the back plate 1, the second end of the reflective electrode 31 is arranged on the side of the back plate 1 close to the light-emitting element 2, and the control electrode 32 is located on the side of the substrate 11 close to the light-emitting element 2; the voltage difference between the reflective electrode 31 and the control electrode 32 is a first voltage difference, and the reflective electrode 31 causes part of the light of the light-emitting element 2 to be emitted at a first emission angle a; the voltage difference between the reflective electrode 31 and the control electrode 32 is a second voltage difference, and the reflective electrode 31 causes part of the light of the light-emitting element 2 to be emitted at a second emission angle b; wherein the first voltage difference is not equal to the second voltage difference; the first emission angle a is not equal to the second emission angle b.

[0099] The light-emitting element 2 may be a light-emitting diode (LED) chip, a micro-LED, or a mini-LED. The light-emitting element 2 is arranged on one side of the back panel 1 and is electrically connected to a driving circuit in the back panel 1. The light-emitting element 2 is controlled to emit light by the driving circuit.

[0100] The micromechanical structure 3 may be made of a metal conductive material. The micromechanical structure 3 and the light emitting element 2 are on the same side of the back plate 1 , and include a reflective electrode 31 and a control electrode 32 .

[0101] Specifically, the preparation process of the display panel may be to first prepare a micromechanical structure 3 on one side of the back panel 1 so that the micromechanical structure 3 is arranged on one side of the back panel 1, and then prepare a light-emitting element 2 so that the light-emitting element 2 is connected to a driving circuit in the back panel 1, and the micromechanical structure 3 is arranged on the side of the light-emitting element 2 to receive and adjust the light on the side of the light-emitting element 2.

[0102] The technical solution of the embodiment of the present invention prepares a light-emitting element and a micromechanical structure on a backplane, and controls the voltage difference between the reflective electrode and the control electrode of the micromechanical structure. The voltage difference can be adjusted according to the needs of different application scenarios, and then the angle between the reflective electrode and the plane where the substrate is located can be adjusted, thereby changing the emission angle of part of the light of the light-emitting element. This can increase the light output of the display panel in some application scenarios, and expand the viewing angle of the display panel in some application scenarios, thereby ensuring the display effect of the display panel and expanding the application scenario of the display panel.

[0103] Based on the above embodiments, Fig.12 is a flow chart of a second method for preparing a display panel according to an embodiment of the present invention. Fig.13is a structural diagram corresponding to a second method for preparing a display panel according to an embodiment of the present invention, combined with Fig.12 and Fig.13 As shown, the projection of the reflective electrode 31 on the substrate 11 at least partially overlaps with the control electrode 32. The preparation method comprises:

[0104] S20, provide a backplane. Fig.13 As shown in step (k3) in .

[0105] S21, depositing and patterning electrode metal on one side of the substrate to form a fixed portion of the reflective electrode and a control electrode. Fig.13 As shown in step (k4) in the figure.

[0106] First, an electrode metal is deposited on one side of the substrate 11 , and the entire electrode metal layer covers the substrate 11 . The electrode metal is etched and patterned to form the fixed portion 311 of the reflective electrode 31 and the control electrode 32 .

[0107] S22, depositing a passivation layer on the fixed portion and the control electrode. Fig.13 As shown in step (k5).

[0108] The passivation layer 12 is further deposited on the fixing portion 311 and the control electrode 32, i.e., on one side of the substrate 11, and the passivation layer 12 covers the fixing portion 311 and the control electrode 32. It can be understood that the purpose of depositing the passivation layer 12 is to set the control electrode 32 in the backplane 1 and to fix the deformable portion 312 through the passivation layer 12 and provide support for the deformable portion 312.

[0109] S23, forming a first through hole at a position of the passivation layer corresponding to the fixing portion. Fig.13 As shown in step (k6) in the figure.

[0110] The passivation layer 12 corresponding to the fixed portion 311 is etched to form a first through hole 121 , and the first through hole 121 penetrates the passivation layer 12 and exposes the fixed portion 311 , so that the deformable portion 312 can be connected to the fixed portion 311 later.

[0111] S24, forming a sacrificial layer on the passivation layer. Fig.13 As shown in step (k7).

[0112] Among them, the sacrificial layer 5 can be the basis for preparing the deformation part 312. The contour of the sacrificial layer 5 determines the shape of the deformation part 312. If it is necessary to ensure that the deformation part 312 is connected to the fixing part 311, the sacrificial layer 5 cannot cover the first through hole 121. The shape of the corresponding sacrificial layer 5 can be prepared according to requirements.

[0113] S25, forming a deformation portion of the reflective electrode on the sacrificial layer. Fig.13 As shown in step (k8) in the figure.

[0114] A metal layer is deposited on the sacrificial layer 5 , which covers the surface of the back plate 1 including the first through hole 121 and the surface of the sacrificial layer 5 . The metal layer is etched to form a corresponding deformation portion 312 of the reflective electrode 31 , which is connected to the fixed portion 311 .

[0115] S26, removing the sacrificial layer. Fig.13 As shown in step (k9) in the figure.

[0116] The sacrificial layer 5 is removed so that the deformation portion 312 is suspended in the air, thereby ensuring that the deformation portion 312 can be adjusted in angle subsequently.

[0117] S27, forming a light emitting element. Fig.13 As shown in step (k10) in .

[0118] When the micromechanical structure 3 is prepared, the light emitting element 2 can be arranged according to the position of the micromechanical structure 3 , so that the micromechanical structure 3 is arranged on the side of the light emitting element 2 to ensure the adjustment of the emission angle of the light on the side of the light emitting element 2 .

[0119] The technical solution of the embodiment of the present invention ensures the display effect of the display panel and expands the application scenarios of the display panel by sequentially preparing a fixing part, a control electrode, a passivation layer, a first through hole, a sacrificial layer, and a deformation part on one side of a substrate to form a micromechanical structure and preparing a light-emitting element.

[0120] Based on the above embodiments, Fig.14 is a flow chart of a third method for preparing a display panel according to an embodiment of the present invention. Fig.15 is a structural diagram corresponding to a third method for preparing a display panel according to an embodiment of the present invention, combined with Fig.14 and Fig.15 As shown, the light emitting element 2 includes an electrode and a light emitting portion 22, the electrode is reused as a control electrode 32, and a micromechanical structure 3 and the light emitting element 2 are formed on one side of the back plate 1. The preparation method includes:

[0121] S30, provide a backplane. Fig.15 As shown in step (k11) in FIG.

[0122] S31, depositing and patterning electrode metal on one side of the substrate to form a fixed portion of the reflective electrode. Fig.15 As shown in step (k12) in .

[0123] Among them, an electrode metal is deposited on one side of the substrate 11, and the entire electrode metal layer covers the substrate 11, and the patterned electrode metal is etched to form the fixed portion 311 of the reflective electrode 31. It can be understood that in the embodiment of the present invention, the electrode in the light-emitting element 2 is reused as the control electrode 32, so there is no need to etch the control electrode 32 in this step, which simplifies the process flow.

[0124] S32, depositing a passivation layer on the fixed portion. Fig.15 As shown in step (k13) in .

[0125] The passivation layer 12 is further deposited on the fixing portion 311 and the control electrode 32, i.e., on one side of the substrate 11, and the passivation layer 12 covers the fixing portion 311 and the control electrode 32. It can be understood that the purpose of depositing the passivation layer 12 is to set the control electrode 32 in the backplane 1 and to fix the deformable portion 312 through the passivation layer 12 and provide support for the deformable portion 312.

[0126] S33, forming a first through hole at a position of the passivation layer corresponding to the fixing portion. Fig.15 As shown in step (k14).

[0127] The passivation layer 12 corresponding to the fixed portion 311 is etched to form a first through hole 121 , and the first through hole 121 penetrates the passivation layer 12 and exposes the fixed portion 311 , so that the deformable portion 312 can be connected to the fixed portion 311 later.

[0128] S34, forming a sacrificial layer on the passivation layer. Fig.15 As shown in step (k15).

[0129] Among them, the sacrificial layer 5 can be the basis for preparing the deformation part 312. The contour of the sacrificial layer 5 determines the shape of the deformation part 312. If it is necessary to ensure that the deformation part 312 is connected to the fixing part 311, the sacrificial layer 5 cannot cover the first through hole 121. The shape of the corresponding sacrificial layer 5 can be prepared according to requirements.

[0130] S35, forming a deformation portion of the reflective electrode on the sacrificial layer. Fig.15 As shown in step (k16) in .

[0131] A metal layer is deposited on the sacrificial layer 5 , which covers the surface of the back plate 1 including the first through hole 121 and the surface of the sacrificial layer 5 . The metal layer is etched to form a corresponding deformation portion 312 of the reflective electrode 31 , which is connected to the fixed portion 311 .

[0132] S36, removing the sacrificial layer. Fig.15 As shown in step (k17).

[0133] The sacrificial layer 5 is removed so that the deformation portion 312 is suspended in the air, thereby ensuring that the deformation portion 312 can be adjusted in angle subsequently.

[0134] S37, forming electrodes and a light-emitting portion of the light-emitting element, wherein the projection of the edge of the light-emitting portion on the substrate is located within the projection of the electrode on the substrate. Fig.15 As shown in step (k18).

[0135] When the micromechanical structure 3 is prepared, the light emitting element 2 can be arranged according to the position of the micromechanical structure 3 , so that the micromechanical structure 3 is arranged on the side of the light emitting element 2 to ensure the adjustment of the emission angle of the light on the side of the light emitting element 2 .

[0136] In order to ensure the effect of interaction between the electrode in the light-emitting element 2 and the reflective electrode 31, the distance between the reflective electrode 31 and the electrode of the light-emitting element 2 needs to be minimized, and the normal operation of the light-emitting element 2 needs to be ensured. Therefore, the projection of the edge of the light-emitting portion 22 on the substrate 11 is set to be within the projection of the electrode on the substrate 11, that is, the projection of the electrode on the substrate 11 and the projection of the edge of the light-emitting portion 22 on the substrate 11 partially overlap and partially do not overlap, so that the electrode is closer to the reflective electrode 31, thereby ensuring the control effect of the reflective electrode 31.

[0137] The technical solution of the embodiment of the present invention is to reuse the electrode of the light-emitting element as the control electrode 32, and sequentially prepare a fixing part, a passivation layer, a first through hole, a sacrificial layer, and a deformation part to form a micromechanical structure, and then set the light-emitting element to achieve control of the light output and viewing angle of the display panel, thereby ensuring the function of the display panel while simplifying the structure of the display panel.

[0138] Based on the same inventive concept, an embodiment of the present invention provides a display device, which includes a display panel.

[0139] For example, Fig.16 is a schematic diagram of the structure of a display device provided according to an embodiment of the present invention, and the display device 6 includes a display panel 7. Therefore, the display device 6 also has the beneficial effects of the display panel 7 in the above-mentioned embodiment, and the similarities can be understood by referring to the above explanation of the display panel 7, which will not be repeated below.

[0140] The display device 6 provided in the embodiment of the present invention can be Fig.16 The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, industrial control equipment, medical display screens, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0141] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: It includes a back plate and a plurality of light-emitting elements located on one side of the back plate; The backplane includes a substrate and a micromechanical structure located on a side of the substrate close to the light-emitting element, the micromechanical structure includes a reflective electrode and a control electrode, the first end of the reflective electrode is arranged in the backplane, the second end of the reflective electrode is arranged on a side of the backplane close to the light-emitting element, and the control electrode is located on a side of the substrate close to the light-emitting element; The voltage difference between the reflective electrode and the control electrode is a first voltage difference, and the reflective electrode causes part of the light of the light emitting element to be emitted at a first emission angle; The voltage difference between the reflective electrode and the control electrode is a second voltage difference, and the reflective electrode causes part of the light of the light emitting element to be emitted at a second emission angle; Wherein, the first voltage difference is not equal to the second voltage difference; The first emission angle is not equal to the second emission angle.

2. The display panel according to claim 1, characterized in that: The first voltage difference is greater than the second voltage difference, and the first emission angle is less than the second emission angle.

3. The display panel according to claim 1, characterized in that: A projection of the reflective electrode on the substrate at least partially overlaps with the control electrode.

4. The display panel according to claim 1, characterized in that: The light-emitting element includes an electrode and a light-emitting portion, the projection of the edge of the light-emitting portion on the substrate is located within the projection of the electrode on the substrate, and the electrode is reused as the control electrode.

5. The display panel according to claim 3, characterized in that: An overlapping area between a projection of the reflective electrode on the substrate and the control electrode is greater than or equal to 50% of a projection area of ​​the control electrode on the substrate.

6. The display panel according to claim 3, characterized in that: The back panel also includes a passivation layer located on a side of the substrate close to the light-emitting element, the passivation layer includes a first through hole, the reflective electrode includes a fixed portion and a deformation portion, the passivation layer covers the fixed portion and the control electrode, and the first end of the deformation portion is connected to the fixed portion through the first through hole.

7. The display panel according to claim 4, characterized in that: The backplane also includes a passivation layer located on a side of the substrate close to the light-emitting element, the passivation layer includes a first through hole, the reflective electrode includes a fixed portion and a deformable portion, the passivation layer covers the fixed portion, and the first end of the deformable portion is connected to the fixed portion through the first through hole.

8. The display panel according to claim 6 or 7, characterized in that: The depth of the first through hole is greater than or equal to 3 μm and less than or equal to 5 μm.

9. The display panel according to claim 6 or 7, characterized in that: A dimension of the fixing portion in a first direction is greater than a dimension of the deformable portion in the first direction, and the first direction is a thickness direction of the deformable portion.

10. The display panel according to claim 6 or 7, characterized in that: The deformation portion includes a first branch and a second branch. The first end of the first branch is connected to the fixing portion. The second end of the first branch is connected to the first end of the second branch. The second end of the second branch is suspended.

11. The display panel according to claim 4, characterized in that: The minimum distance between the reflective electrode and the control electrode is greater than or equal to 2 μm and less than or equal to 10 μm.

12. The display panel according to claim 1, characterized in that: The height of the light emitting element relative to the back plate is d1, the height of the second end of the reflective electrode relative to the back plate is d2, and d2≥0.5d1.

13. The display panel according to claim 12, characterized in that: d2≥d1.

14. The display panel according to claim 1, characterized in that: The light emitting element is arranged corresponding to the two micro-mechanical structures, and the reflective electrodes of the two micro-mechanical structures are respectively located on two opposite sides of the light emitting element; or The light emitting elements are arranged corresponding to the four micro-mechanical structures, and the reflective electrodes are arranged opposite to each other in pairs.

15. The display panel according to claim 1, characterized in that: comprising a plurality of pixel units, each pixel unit comprising at least two light-emitting elements, each pixel unit being arranged corresponding to two micromechanical structures, and each reflective electrode of the two micromechanical structures being located at two opposite sides of the pixel unit; or The pixel units are arranged corresponding to the four micro-mechanical structures, and the reflective electrodes are arranged opposite to each other in pairs.

16. A method for preparing a display panel, characterized in that: In the display panel according to any one of claims 1 to 15, the preparation method comprises: Provide back panel; forming a micromechanical structure and a light-emitting element on one side of the back plate; The micromechanical structure includes a reflective electrode and a control electrode, wherein the first end of the reflective electrode is arranged in the back plate, the second end of the reflective electrode is arranged on a side of the back plate close to the light-emitting element, and the control electrode is located on a side of the substrate close to the light-emitting element; the voltage difference between the reflective electrode and the control electrode is a first voltage difference, and the reflective electrode causes part of the light of the light-emitting element to be emitted at a first emission angle; the voltage difference between the reflective electrode and the control electrode is a second voltage difference, and the reflective electrode causes part of the light of the light-emitting element to be emitted at a second emission angle; wherein the first voltage difference is not equal to the second voltage difference; and the first emission angle is not equal to the second emission angle.

17. The method for manufacturing a display panel according to claim 16, characterized in that: The projection of the reflective electrode on the substrate at least partially overlaps with the control electrode; a micromechanical structure and a light-emitting element are formed on one side of the backplane, including: Depositing and patterning electrode metal on one side of the substrate to form a fixed portion of the reflective electrode and the control electrode; depositing a passivation layer on the fixing portion and the control electrode; forming a first through hole at a position of the passivation layer corresponding to the fixing portion; forming a sacrificial layer on the passivation layer; forming a deformation portion of the reflective electrode on the sacrificial layer; removing the sacrificial layer; The light emitting element is formed.

18. The method for preparing a display panel according to claim 16, characterized in that: The light-emitting element comprises an electrode and a light-emitting portion, and the electrode is multiplexed as the control electrode; A micromechanical structure and a light-emitting element are formed on one side of the backplane, including: Depositing and patterning electrode metal on one side of the substrate to form a fixing portion of the reflective electrode; depositing a passivation layer on the fixing portion; forming a first through hole at a position of the passivation layer corresponding to the fixing portion; forming a sacrificial layer on the passivation layer; forming a deformation portion of the reflective electrode on the sacrificial layer; removing the sacrificial layer; The electrodes and the light-emitting portion of the light-emitting element are formed, and the projection of the edge of the light-emitting portion on the substrate is located within the projection of the electrode on the substrate.

19. A display device, characterized in that: A display panel comprising any one of claims 1-15.

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