Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device. The display panel comprises a substrate; the array layer comprises a driving circuit and a first metal layer, and the first metal layer comprises a first electrode and a second electrode; the light-emitting element is electrically connected with the driving circuit through the first electrode, and the light-emitting element is electrically connected with the second electrode; the light-emitting elements comprise a first light-emitting element and a second light-emitting element, and the light-emitting color of the first light-emitting element is different from the light-emitting color of the second light-emitting element; wherein the orthographic projection area of the first electrode electrically connected with the first light-emitting element on the substrate is S1, and the orthographic projection area of the first electrode electrically connected with the second light-emitting element on the substrate is S2; wherein S1-S2 is greater than 0. The first electrodes electrically connected with the light-emitting elements of different colors are differentially arranged, it is guaranteed that the electric connection effects of the light-emitting elements of different colors and the first electrodes are the same or similar, the overall structural stability of the display panel is guaranteed, and the display effect of the display panel is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] With the continuous development of display technology, display panels have been widely used in people's production and life. In order to better meet people's needs, the display panel can be adjusted, such as adjusting some structures and film layers in the display panel, so as to improve the overall effect of the display panel. Summary of the invention

[0003] The embodiments of the present invention provide a display panel and a method for manufacturing the same, and a display device. The first electrodes electrically connected to light-emitting elements of different colors are arranged differently to ensure the overall structural stability of the display panel, thereby improving the display effect of the display panel.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0005] substrate;

[0006] an array layer, the array layer being located at one side of the substrate, the array layer comprising a driving circuit and a first metal layer, the first metal layer being located at a side of the driving circuit away from the substrate; the first metal layer comprising a first electrode and a second electrode;

[0007] a light emitting element, the light emitting element being located at a side of the array layer away from the substrate, the light emitting element being electrically connected to the driving circuit via the first electrode, and the light emitting element being electrically connected to the second electrode;

[0008] The light-emitting element comprises a first light-emitting element and a second light-emitting element, wherein the light-emitting color of the first light-emitting element is different from the light-emitting color of the second light-emitting element;

[0009] The orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element on the substrate is S1, and the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element on the substrate is S2; wherein |S1-S2|>0.

[0010] In a second aspect, an embodiment of the present invention provides a method for manufacturing a display panel.

[0011] providing a substrate;

[0012] Providing an array layer, the array layer is located on one side of the substrate, the array layer includes a driving circuit and a first metal layer, the first metal layer is located on a side of the driving circuit away from the substrate; the first metal layer includes a first electrode and a second electrode; the first electrode is electrically connected to the driving circuit;

[0013] A light-emitting element carrier substrate is provided, wherein the light-emitting element carrier substrate comprises a plurality of light-emitting elements; the light-emitting elements comprise a first light-emitting element and a second light-emitting element, and the light-emitting color of the first light-emitting element is different from the light-emitting color of the second light-emitting element;

[0014] The light-emitting element carrying substrate is placed opposite to the array layer, and the light-emitting element is controlled to be attached to the first electrode and the second electrode; wherein the orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element to the substrate is S1, and the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element to the substrate is S2; wherein |S1-S2|>0;

[0015] The light emitting element and the first electrode are scanned by laser to control the light emitting element to be electrically connected to the driving circuit via the first electrode; the light emitting element and the second electrode are scanned by laser to control the light emitting element to be electrically connected to the second electrode.

[0016] In a third aspect, an embodiment of the present invention provides a display device, comprising the display panel described in any one of the first aspects.

[0017] An embodiment of the present invention provides a display panel, which includes an array layer and a light-emitting element located on one side of a substrate, the array layer includes a driving circuit and a first metal layer, the first metal layer includes a first electrode and a second electrode, the light-emitting element is electrically connected to the driving circuit through the first electrode, and the light-emitting element is also electrically connected to the second electrode; the driving circuit is used to drive the light-emitting element to perform light-emitting display, thereby realizing the display function of the display panel; further, the light-emitting element includes a first light-emitting element and a second light-emitting element, the light-emitting colors of the first light-emitting element and the second light-emitting element are different, that is, the color display effect of the display panel is realized, but there are differences when light-emitting elements of different colors are bonded to the pad on the first electrode, that is, the electrical connection effect of light-emitting elements of different colors to the first electrode is different; further, the orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element on the substrate is adjusted to be different from the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element on the substrate, thereby ensuring that the electrical connection effect of light-emitting elements of different colors to the first electrode is the same or similar, ensuring the overall structural stability of the display panel, thereby improving the display effect of the display panel.

[0018] 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

[0019] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required to describe the embodiments. Obviously, the drawings introduced are only drawings of a part of the embodiments to be described in the present invention, rather than all the drawings. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 The first enlarged schematic diagram of the middle area A;

[0022] Figure 3 yes Figure 2 A schematic cross-sectional view along the section line BB';

[0023] Figure 4 yes Figure 2 A schematic cross-sectional view along the section line C-C';

[0024] Figure 5 yes Figure 2 A schematic diagram of the structure of the middle part;

[0025] Figure 6 yes Figure 1 A second enlarged schematic diagram of the middle area A;

[0026] Figure 7 yes Figure 6 A schematic diagram of the structure of the middle part;

[0027] Figure 8 is a schematic structural diagram of a first metal layer provided by an embodiment of the present invention;

[0028] Fig. 9 is a schematic structural diagram of a second first metal layer provided by an embodiment of the present invention;

[0029] Fig.10 yes Figure 2 Another schematic diagram of the structure of the middle part;

[0030] Fig.11 is a schematic structural diagram of a first second metal layer provided in an embodiment of the present invention;

[0031] Fig.12 is a schematic structural diagram of a second second metal layer provided in an embodiment of the present invention;

[0032] Fig.13 is a schematic structural diagram of a third second metal layer provided by an embodiment of the present invention;

[0033] Fig.14 is a schematic structural diagram of a fourth second metal layer provided by an embodiment of the present invention;

[0034] Fig.15 is a schematic structural diagram of a driving circuit provided by an embodiment of the present invention;

[0035] Fig.16 is a flow chart of a method for preparing a display panel provided by an embodiment of the present invention;

[0036] Fig.17 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] 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 thereof are intended to cover non-exclusive inclusions, for example, a system, product or device comprising a series of units is not necessarily limited to those steps or units clearly listed, but may include other units that are not clearly listed or inherent to these products or devices.

[0039] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention, Figure 2 yes Figure 1 The first enlarged schematic diagram of area A in the middle, Figure 3 yes Figure 2 A schematic cross-sectional view along the section line B-B', Figure 4 yes Figure 2 A schematic cross-sectional view along the section line C-C', Figure 5 yes Figure 2 A schematic diagram of the structure of the middle part, Figure 6yes Figure 1 The second enlarged schematic diagram of area A in the middle, Figure 7 yes Figure 6 A schematic diagram of the structure of the middle part, see Figures 1 to 7 As shown, an embodiment of the present invention provides a display panel 10, which includes: a substrate 100; an array layer 200, the array layer 200 is located on one side of the substrate 100, the array layer 200 includes a driving circuit 210 and a first metal layer 220, the first metal layer 220 is located on a side of the driving circuit 210 away from the substrate 100; the first metal layer 220 includes a first electrode 221 and a second electrode 222; a light emitting element 300, the light emitting element 300 is located on a side of the array layer 200 away from the substrate 100, and the light emitting element 300 is connected to the substrate 100 through the first electrode The electrode 221 is electrically connected to the driving circuit 210, and the light-emitting element 300 is electrically connected to the second electrode 222; the light-emitting element 300 includes a first light-emitting element 310 and a second light-emitting element 320, and the light-emitting color of the first light-emitting element 310 is different from the light-emitting color of the second light-emitting element 320; wherein, the orthographic projection area of ​​the first electrode 221 electrically connected to the first light-emitting element 310 on the substrate 100 is S1, and the orthographic projection area of ​​the first electrode 221 electrically connected to the second light-emitting element 320 on the substrate 100 is S2; wherein, |S1-S2|>0.

[0040] Among them, reference Figure 1 As shown, the display panel 10 includes an array layer 200 located on one side of the substrate 100, and the display panel 10 also includes a plurality of light-emitting elements 300 located on one side of the array layer 200. The array layer 200 is used to drive the light-emitting elements 300 to emit light for display, thereby realizing the display function of the display panel 10. Among them, the light-emitting elements 300 include light-emitting elements of different colors, such as red light-emitting elements, blue light-emitting elements, and green light-emitting elements, thereby realizing the color display effect of the display panel 10. In the display panel 10, the plurality of light-emitting elements 300 are arranged in different ways. Figure 1 It is only shown that the display panel 10 includes a plurality of light emitting elements 300 , and the specific arrangement of the light emitting elements 300 is not illustrated one by one in the embodiment of the present invention.

[0041] Specifically, refer to Figures 1 to 3As shown, the array layer 200 includes a driving circuit 210, and the light-emitting element 300 of the display panel 10 is electrically connected to the driving circuit 210. The driving circuit 210 drives the light-emitting element 300 to achieve the light-emitting effect of the display panel 10. Specifically, the driving circuit 210 includes at least one transistor 2101, and the transistor 2101 is electrically connected to the light-emitting element 300 to provide a driving current for the light-emitting element 300, thereby ensuring the normal display of the display panel 10. Further, the driving circuit 210 may include "4T1C", "7T1C" and "8T1C", etc., where "T" represents a transistor, "C" represents a capacitor, Figure 3 The driving circuit 210 is not specifically shown in the figure, and only a transistor 2101 is used as an example. Further, the array layer 200 includes a plurality of stacked film layers, such as a gate insulating layer 201, a first interlayer insulating layer 202, a second interlayer insulating layer 203, a first planarizing layer 204, and a second planarizing layer 205. The specific film layer types and quantities in the array layer 200 can be adaptively adjusted according to different requirements, and the embodiments of the present invention are not specifically limited here. Further, Figure 3 The transistor 2101 shown in the driving circuit 210 includes: an active layer 2101a, a gate 2101b, a drain 2101c and a source 2101d. The specific configuration of the transistor 2101 can also be adaptively adjusted according to requirements, and the embodiment of the present invention does not make specific limitations on this.

[0042] For further reference, Figure 2 and Figure 3As shown, the array layer 200 further includes a first metal layer 220, which is located on a side of the driving circuit 210 away from the substrate 100, and the first metal layer 220 includes a first electrode 221 and a second electrode 222, wherein the first electrode 221 and the second electrode 222 are insulated. Although the light-emitting element 300 is electrically connected to both the first electrode 221 and the second electrode 222, the first electrode 221 and the second electrode 222 provide different electrical signals for the light-emitting element 300. Among them, the light-emitting element 300 is electrically connected to the driving circuit 210 through the first electrode 221. Furthermore, the first electrode 221 and the second electrode 222 can be understood as two pads, and the light-emitting element 300 includes a first connection structure 300a and a second connection structure 300b. The first connection structure 300a can be bonded to the first pad 410 on the first electrode 221 by laser irradiation or the like, the first connection structure 300a is electrically connected to the first electrode 221, the second connection structure 300b is bonded to the second pad 420 on the second electrode 222, and the second connection structure 300b is electrically connected to the second electrode 222, that is, the light-emitting element 300 is electrically connected to the two pads, thereby ensuring the driving of the light-emitting element 300, thereby realizing the display luminescence of the display panel 10.

[0043] Further, the light emitting element 300 includes a first light emitting element 310 and a second light emitting element 320, wherein the light emitting colors of the first light emitting element 310 and the second light emitting element 320 are different, and the display panel 10 realizes the color display effect of the display panel 10 by driving the light emitting elements 300 of different colors to emit light. Figure 2 and Figure 3 As shown, the first light-emitting element 310 includes a first connection structure 300a (shown as 310a in the figure) and a second connection structure 300b (shown as 310b in the figure), wherein the first connection structure 310a of the first light-emitting element 310 is electrically connected to the first electrode 221 (shown as 221a in the figure) through the first pad 410, and the second connection structure 310b of the first light-emitting element 310 is electrically connected to the second electrode 222 through the second pad 420; Figure 2 and Figure 4As shown, the second light-emitting element 320 includes a first connection structure 300a (shown as 320a in the figure) and a second connection structure 300b (shown as 320b in the figure), wherein the first connection structure 300b of the second light-emitting element 310 is electrically connected to the first electrode 221 (shown as 221b in the figure) through the first pad 410, and the second connection structure 320b of the second light-emitting element 300 is electrically connected to the second electrode 222 through the second pad 420. The first pad 410 and the first connection structure 300a can be bonded under laser irradiation, and the second pad 420 and the second connection structure 300b can be bonded under laser irradiation, thereby ensuring the electrical connection relationship between the light-emitting element 300 and the first electrode 221 and the second electrode 222. Exemplarily, the material of the first pad 410 and the second pad 420 can be tin or the like.

[0044] When the first light emitting element 310 and the second light emitting element 320 are transferred to the array layer 200 and bonded to the first electrode 221 and the second electrode 222, laser irradiation can generally be collected at the bonding point between the light emitting element 300 and the first electrode 221 and the second electrode 222 (specifically, the laser irradiates the first connection structure 300a of the light emitting element 300 and the corresponding first pad 410, and irradiates the second connection structure 300b and the corresponding second pad 420), and welding is performed to achieve the electrical connection between the two, that is, the electrical connection between the light emitting element 300 and the array layer 200 is achieved, so that the driving circuit 210 in the array layer 200 can ensure the driving of the light emitting element 300, and the display function of the display panel 10 can be ensured. Among them, the difference in the structure of the light emitting elements 300 of different colors (the first light emitting element 310 and the second light emitting element 320 have different structures), and thus the degree of electrical connection between different light emitting elements 300 and the first electrode 221 will be different when the same laser irradiation is used. Exemplarily, the first light-emitting element 310 is a red light-emitting chip, and the second light-emitting element 320 is a blue light-emitting chip or a green light-emitting chip. When laser welding is used, the temperature generated when the red light-emitting chip is bonded to the first solder pad 410 on the corresponding first electrode 221 will be higher than the temperature generated when the blue light-emitting chip is bonded to the first solder pad 410 on the corresponding first electrode 221, or the temperature generated when the red light-emitting chip is bonded to the corresponding first electrode 221 will be higher than the temperature generated when the green light-emitting chip is bonded to the corresponding first electrode 221. Different temperatures will have different effects on the bonding effect. In order to ensure that the bonding degree and electrical connection degree between the light-emitting elements 300 at various positions in the display panel 10 and the array layer 200 are the same or similar, the first electrode 221 can be adjusted accordingly to ensure that when each light-emitting element 300 is transferred to the array layer 200 for bonding, the same laser can be used for synchronous irradiation, and the bonding degree between each light-emitting element 300 and the array layer 200 is the same or similar, thereby ensuring the overall structural stability of the display panel 10 and improving the overall display effect of the display panel 10.

[0045] Specifically, refer to Figure 2 and Figure 5As shown, the orthographic projection area of ​​the first electrode 221 (shown as 221a in the figure) electrically connected to the first light-emitting element 310 on the substrate 100 is S1, and the orthographic projection area of ​​the first electrode 221 (shown as 221b in the figure) electrically connected to the second light-emitting element 320 on the substrate 100 is S2; wherein, |S1-S2|>0, indicating that S1 and S2 are not the same. That is, there is a difference between the orthographic projection area of ​​the first electrode 221 (shown as 221a in the figure) electrically connected to the first light-emitting element 310 and the orthographic projection area of ​​the first electrode 221 (shown as 221b in the figure) electrically connected to the second light-emitting element 320 on the substrate 100. By differentially arranging the first electrodes 221 electrically connected to light-emitting elements 300 of different colors, it can be ensured that the bonding degrees of different light-emitting elements 300 and the array layer 200 are similar, thereby ensuring that the overall structure of the display panel 10 is more stable.

[0046] When the first electrode 221 is bonded to the corresponding light-emitting element 300, the first pad 410 on the first electrode 221 and the first connection structure 300a of the light-emitting element 300 are melted by laser irradiation to achieve bonding electrical connection. When the laser is irradiated, heat is generated at the first electrode 221 and the first connection structure 300a. If the heat generated is too large, the electrodes at the first electrode 221 and the first connection structure 300a will be over-melted and short-circuited. If the heat generated is too small, the first electrode 221 and the first connection structure 300a will be virtually connected. Both of them will affect the driving effect of the driving circuit 210 on the light-emitting element 300, and further affect the overall display effect of the display panel 10. Furthermore, the relative contact area between the first electrode 221 and the first connection structure 300a will directly affect the heat generated during welding, and the first connection structure 300a corresponding to the light-emitting element 300 is generally regulated, so the size of the first electrode 221 can be adjusted to achieve differentiated settings of the contact area between the first electrode 221 and the first connection structure 300a. Specifically, the size of the first electrode 221 corresponding to the light-emitting element 300 that is prone to generate high heat can be smaller than the size of the first electrode 221 corresponding to other light-emitting elements 300, thereby ensuring that when different color light-emitting elements 300 are welded with the corresponding first electrode 221, the temperature generated when they melt is the same or similar, ensuring the same or similar bonding degree, thereby improving the bonding effect between the light-emitting element 300 and the array layer 200, ensuring the overall structural uniformity of the display panel 10, and ensuring the overall display effect of the display panel 10.

[0047] Optionally, the display panel 10 may also reserve space for a redundant light-emitting element 340, which can emit light when an adjacent light-emitting element 300 is abnormal and has not been repaired in time, thereby ensuring the overall display effect of the display panel 10. Exemplarily, when it is detected that the red light-emitting element is defective and cannot emit light, another redundant light-emitting element 340 that is close to the red light-emitting element is fixed, and the abnormal red light-emitting element can be repaired using the redundant light-emitting element 340 that is close to the red light-emitting element. The first fixed red light-emitting element remains in its original position, so that there are two light-emitting elements emitting red light in the area. Figure 2 and Figure 6 In the figure, the redundant light emitting element 340 is reserved, and the redundant light emitting element 340 may not be provided in the display panel 10, which reflects the flexibility and diversity of the setting of the display panel 10.

[0048] Optional, reference Figures 2 to 5 As shown, Figure 5 It can be understood as Figure 2 Schematic diagram of the structure of the middle part. Figure 6 and Figure 7 As shown, Figure 7 It can be understood as Figure 6 Schematic diagram of the structure of the part. Figure 2 The first metal layer 220 is prepared on the entire surface; Figure 6 The first metal layer 220 is not prepared on the entire surface, and the first metal layer 220 is similar to a "hanging basket" setting, that is, the film layer setting of the first metal layer 220 is diverse and can be differentiated according to different display panels 10.

[0049] In summary, an embodiment of the present invention provides a display panel, wherein the light-emitting elements include a first light-emitting element and a second light-emitting element with different light-emitting colors, so as to achieve a color display effect of the display panel; further, the light-emitting elements of different colors are adjusted to be different when they are electrically connected to the first electrode, that is, the orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element on the substrate is adjusted to be different from the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element on the substrate, thereby ensuring that the electrical connection effects of the light-emitting elements of different colors with the first electrode are the same or similar, ensuring the overall structural stability of the display panel, and thus improving the display effect of the display panel.

[0050] Continue to refer Figures 1 to 7 As shown, the wavelength of the emitted light of the first light emitting element 310 is a1, and the wavelength of the emitted light of the second light emitting element 320 is a2; wherein, a2<a1, and S1<S2.

[0051] Among them, the wavelength of the emitted light of the first light-emitting element 310 is different from the wavelength of the emitted light of the second light-emitting element 320, and it can be understood that the light emission colors of the first light-emitting element 310 and the second light-emitting element 320 are different. Specifically, the wavelength of the emitted light of the first light-emitting element 310 is a1, and the wavelength of the emitted light of the second light-emitting element 320 is a2, and it satisfies: a2<a1. Among them, the wavelength of red light is greater than the wavelength of green light, and the wavelength of red light is greater than the wavelength of blue light, so the first light-emitting element 310 can be a red light-emitting element, the second light-emitting element 320 can be a blue light-emitting element, or the second light-emitting element 320 can be a green light-emitting element.

[0052] Further, taking the first light-emitting element 310 as a red light-emitting element and the second light-emitting element 320 as a green light-emitting element as an example, when the red light-emitting element and the green light-emitting element are respectively welded to the first electrode 221, when the same laser irradiation is used and the corresponding first electrodes 221 are not set differently, the heat generated by welding the red light-emitting element and the corresponding first electrode 221 is greater than the heat generated by welding the green light-emitting element and the corresponding first electrode 221. If the laser that ensures the electrical connection effect of the red light-emitting element and the corresponding first electrode 221 is fully scanned, when the corresponding green light-emitting element and the corresponding first electrode 221 are welded, a cold weld will be generated, that is, the bonding effect cannot be guaranteed; similarly, if the laser that ensures the electrical connection effect of the green light-emitting element and the corresponding first electrode 221 is fully scanned, when the corresponding red light-emitting element and the corresponding first electrode 221 are welded, an over-welding short circuit will be generated, and the bonding effect and the electrical connection effect cannot be guaranteed. Therefore, in order to ensure the overall welding effect and to ensure that the overall bonding degree is the same or similar, the welding relative area between the first electrode 221 and the light emitting element 300 may be adjusted accordingly, that is, the size of the first electrode 221 may be adjusted.

[0053] Specifically, refer to Figures 1 to 7 As shown, the orthographic projection area of ​​the first electrode 221 (shown as 221a in the figure) electrically connected to the first light-emitting element 310 is smaller than the orthographic projection area of ​​the first electrode 221 (shown as 221b in the figure) electrically connected to the second light-emitting element 320, that is, S1 is smaller than S2. By differentially setting the first electrode 221, it can be ensured that the bonding degrees of light-emitting elements 300 of different colors on the array layer 200 are the same or similar, thereby ensuring the overall display effect of the display panel 10 and the stability of the structure.

[0054] Continue to refer Figures 1 to 7As shown, the light emitting element 300 further includes a third light emitting element 330, the emission wavelength of the third light emitting element 330 is a3, and the orthographic projection area of ​​the first electrode 221 electrically connected to the third light emitting element 330 on the substrate 100 is S3; wherein, a3 <a2,|S2-S3| / S3≤20%。

[0055] The light emitting element 300 further includes a third light emitting element 330, the emission wavelength of the third light emitting element 330 is a3, and a3 is less than a2, that is, the emission color of the third light emitting element 330 is different from that of the first light emitting element 310, and the emission color of the third light emitting element 330 is different from that of the second light emitting element 320. The emission wavelength of the third light emitting element 330 is less than that of the second light emitting element 320, and the emission wavelength of the second light emitting element 320 is less than that of the first light emitting element 310. For example, the first light emitting element 310 may be a red light emitting element, the second light emitting element 320 may be a green light emitting element, and the third light emitting element 330 may be a blue light emitting element.

[0056] Furthermore, although the green light emitting element and the blue light emitting element emit different light, the heat generated by the blue light emitting element and the green light emitting element when they are melt-bonded with the first pad 410 on the corresponding first electrode 221 by laser irradiation is similar, that is, the heat generated by the second light emitting element 320 and the third light emitting element 330 when they are melted with the corresponding first electrode 221 is similar. In order to simplify the process preparation cost of the first metal layer 220, the size and size of the first electrode 221 corresponding to the second light emitting element 320 and the third light emitting element 330 can be adjusted to be the same or similar. On the one hand, it will not affect the bonding effect of the light emitting element 300 and the array layer 200, ensuring the overall display effect of the display panel 10. On the other hand, it can reduce the difficulty of the preparation of the first electrode 221 and reduce the preparation cost of the display panel 10. Figure 2 and Figure 5 As shown, or refer to Figure 6 and Figure 7As shown, the orthographic projection area of ​​the first electrode 221 (shown as 221b in the figure) electrically connected to the second light-emitting element 320 is the same as or similar to the orthographic projection area of ​​the first electrode 221 (shown as 221c in the figure) electrically connected to the third light-emitting element 330. In this way, by differentially setting the first electrodes 221 corresponding to the first light-emitting element 310 and the second light-emitting element 320, or by differentially setting the first electrodes 221 corresponding to the first light-emitting element 310 and the third light-emitting element 33, it is possible to ensure that the bonding degree between the light-emitting element 300 and the array layer 200 in the display panel 10 is the same or similar, thereby ensuring the overall display effect of the display panel 10. Furthermore, by not differentially setting the first electrodes 221 corresponding to the second light-emitting element 320 and the third light-emitting element 330, the difficulty of the process preparation of the display panel 10 can be reduced, and the process preparation cost of the display panel 10 can be reduced without affecting the overall display effect of the display panel 10.

[0057] Furthermore, there are various ways to differentially arrange the first electrodes electrically connected to different light-emitting elements.

[0058] refer to Figures 1 to 7 As shown, along the first direction X1, the length of the first electrode 221 electrically connected to the first light-emitting element 310 is less than the length of the first electrode 221 electrically connected to the second light-emitting element 320; and / or, along the second direction X2, the length of the first electrode 221 electrically connected to the first light-emitting element 310 is less than the length of the first electrode 221 electrically connected to the second light-emitting element 320; wherein the first direction X1 intersects with the second direction X2 and is parallel to the plane where the substrate 100 is located.

[0059] Specifically, refer to Figure 5 and Figure 7 As shown, along the first direction X1, the length L1 of the first electrode 221 electrically connected to the first light-emitting element 310 is smaller than the length L2 of the first electrode 221 electrically connected to the second light-emitting element 320, and simultaneously along the second direction X2, the length L3 of the first electrode 221 electrically connected to the first light-emitting element 310 is smaller than the length L4 of the first electrode 221 electrically connected to the second light-emitting element 320, thereby reflecting that the area of ​​the first electrode 221 electrically connected to the first light-emitting element 310 is smaller than the area of ​​the first electrode 221 electrically connected to the second light-emitting element 320, that is, it reflects that the first electrodes 221 electrically connected to different light-emitting elements 300 are arranged differently, thereby ensuring the overall structural stability of the display panel 10 and ensuring the overall display effect of the display panel 10.

[0060] Optional, Figure 5 and Figure 7The first electrode 221 electrically connected to the first light-emitting element 310 and the first electrode 221 electrically connected to the second light-emitting element 320 have differentiated sizes in the first direction X1 and the second direction X2, or may have differentiated sizes only in the first direction X1 or the second direction X2, thereby reflecting the diversity of the differentiated settings of the first electrode 221.

[0061] Figure 8 is a schematic structural diagram of a first metal layer provided in an embodiment of the present invention, Fig. 9 is a schematic diagram of the structure of the second first metal layer provided in an embodiment of the present invention, referring to Figures 1 to 9 As shown, the first electrode 221 electrically connected to the first light-emitting element 310 includes at least one first exhaust hole 231, and the first electrode 221 electrically connected to the second light-emitting element 320 includes at least one second exhaust hole 232; within a unit area, the sum of the areas of the first exhaust holes 231 is greater than or equal to the sum of the areas of the second exhaust holes 232.

[0062] Specifically, refer to Figure 8 and Fig. 9 As shown, the first electrode 221 electrically connected to the first light-emitting element 310 includes at least one first exhaust hole 231, and the first electrode 221 electrically connected to the second light-emitting element 320 includes at least one second exhaust hole 232. Along the thickness direction of the display panel 10, the insulating layer of the first metal layer 220 close to the substrate 100 (the second planarization layer 205 is taken as an example in the figure) will release gas due to heat during the process. The gas can be discharged through the first exhaust hole 231 and the second exhaust hole 232 to avoid the first metal layer 220 and the adjacent insulating layer from peeling off due to the influence of the gas, thereby ensuring the overall structural stability of the display panel 10. Optionally, refer to Figure 3 and Figure 4 As shown, the second planarization layer 205 also includes a via hole 230, and the first electrode 221 is electrically connected to the driving circuit 210 through the via hole 230. Further, in order to ensure the overall structural stability of the first metal layer 220, in addition to providing the first exhaust hole 231 and the second exhaust hole 232 at the first electrode 221, a corresponding exhaust hole 233 is also provided at the second electrode 222, thereby ensuring the stability of the first metal layer 220 (including the first electrode 221 and the second electrode 222).

[0063] Furthermore, the sum of the projected areas of the first electrodes 221 electrically connected to different light-emitting elements 300 on the substrate 100 is different, that is, the contact areas between different light-emitting elements 300 and the first electrodes 221 are adjusted to be differentiated. Specifically, in order to achieve the differentiated arrangement of the first electrodes 221, the areas of the exhaust holes on the first electrodes 221 electrically connected to different light-emitting elements 300 can be adjusted to be different. Figure 8 and Fig. 9 As shown, within a unit area, the sum of the areas of the first exhaust holes 231 is greater than or equal to the sum of the areas of the second exhaust holes 232. Within a unit area, if the sum of the areas of the first exhaust holes 231 is larger, it proves that there are more hollow areas in the first electrode 221 electrically connected to the first light-emitting element 310, and thus the area of ​​the area electrically connected to the first light-emitting element 310 is relatively small; similarly, within a unit area, if the sum of the areas of the second exhaust holes 232 is smaller, it proves that there are fewer hollow areas in the first electrode 221 electrically connected to the second light-emitting element 320, and thus the area of ​​the area electrically connected to the second light-emitting element 320 is relatively large, thereby achieving differentiated settings of the first electrodes 221 electrically connected to different light-emitting elements 300, thereby ensuring the overall display effect of the display panel 10.

[0064] Continue to refer Figures 1 to 9 As shown, the area of ​​the first exhaust hole 231 is greater than the area of ​​the second exhaust hole 232; and / or, within a unit area, the number of the first exhaust holes 231 is greater than the number of the second exhaust holes 232.

[0065] Specifically, the first electrodes 221 electrically connected to different light-emitting elements 300 are configured differently, referring to Fig. 9 As shown in the middle area D3 and the area D5, a plurality of first exhaust holes 231 are provided on the first electrode 221 electrically connected to the first light-emitting element 310, and a plurality of second exhaust holes 232 are provided on the first electrode 221 electrically connected to the second light-emitting element 320. The area of ​​the first exhaust holes 231 is set to be larger than the area of ​​the second exhaust holes 232, so that the remaining metal area on the first electrode 221 where the first exhaust holes 231 are set can be ensured to be smaller than the remaining metal area on the first electrode 221 where the second exhaust holes 232 are set, thereby achieving differentiated settings of different first electrodes 221.

[0066] For further reference, Figure 8 As shown in the middle area D1 and the area D2, within a unit area, the number of the first exhaust holes 231 is greater than the number of the second exhaust holes 232. By adjusting the number of the first exhaust holes 231 and the second exhaust holes 232, the differentiated settings of different first electrodes 221 are achieved. Fig. 9 As shown in the middle area D3 and area D4, within a unit area, the number of the first exhaust holes 231 is greater than the number of the second exhaust holes 232, and at the same time, the size of the first exhaust holes 231 is adjusted to be greater than the size of the second exhaust holes 232, reflecting the diversity of the differentiated settings of the first electrode 221.

[0067] Fig.10 yes Figure 2 Another schematic diagram of the structure of the middle part, Fig.11is a schematic diagram of the structure of the first second metal layer provided in an embodiment of the present invention, with reference to Figures 1 to 11 As shown, the array layer 200 also includes a second metal layer 240, which is located on a side of the first metal layer 220 close to the driving circuit 210; the second metal layer 240 includes a first part 241 and a second part 242 that are electrically connected to each other, and the first part 241 and the second part 242 are insulated from the first electrode 221; the orthographic projection of the first part 241 on the substrate 100 at least partially overlaps with the orthographic projection of the first light-emitting element 310 on the substrate 100, and the orthographic projection of the second part 242 on the substrate 100 at least partially overlaps with the orthographic projection of the second light-emitting element 320 on the substrate 100; wherein the metal density of the first part 241 is less than the metal density of the second part 242.

[0068] Specifically, refer to Figures 2 to 5 , Figure 6 As shown, the display panel 10 further includes a second metal layer 240, and the second metal layer 240 is located on a side of the first metal layer 220 close to the driving circuit 210. Fig.10 and Fig.11 As shown, the second metal layer 240 includes a first portion 241 and a second portion 242 , wherein the first portion 241 and the second portion 242 are electrically connected, that is, the first portion 241 and the second portion 242 are an integral structure.

[0069] Furthermore, for the first portion 241, its orthographic projection on the substrate 100 at least partially overlaps with the orthographic projection of the first light-emitting element 310 on the substrate, and the first portion 241 is insulated from the first electrode 221, that is, the first portion 241 is not Figure 3 The vias 230 shown are electrically connected, corresponding to the reference Fig.10 and Fig.11 As shown, the first portion 241 can be understood as the area in the second metal layer 240 that overlaps with the projection of the first light-emitting element 310. Similarly, for the second portion 242, its orthographic projection on the substrate 100 at least partially overlaps with the orthographic projection of the second light-emitting element 320 on the substrate, and the second portion 242 is insulated from the first electrode 221, that is, the second portion 241 is not Figure 4 The vias 230 shown are electrically connected, corresponding to the reference Fig.10 and Fig.11 As shown, the second portion 241 can be understood as a region in the second metal layer 240 that overlaps with the projection of the second light-emitting element 320 .

[0070] Specifically, when the light emitting element 300 is bonded to the array layer 200, the corresponding connection structure in the light emitting element 300 can be electrically connected to the first electrode 221 and the second electrode 222 respectively through laser irradiation, so that the light emitting element 300 is successfully transferred to the array layer 200, thereby ensuring the display of the light emitting element 300, and then realizing the display function of the display panel 10. When the light emitting element 300 is bonded to the array layer 200 through laser irradiation, the laser irradiation will cause the light emitting element 300 to generate heat at the first electrode 221. Among them, the size of the metal area at the bonding with the light emitting element 300 is positively correlated with the degree of heat absorption during bonding. When different light emitting elements 300 generate different amounts of heat, in order to ensure that the bonding degrees of different light emitting elements 300 are similar, that is, the metal absorbs the heat generated by bonding to a similar degree, the metal layer in the array layer 200 can be adjusted to achieve balanced heat generation.

[0071] Among them, Figure 5 , Figure 8 and Fig. 9 As shown, the size and morphology of the first electrode 211 (i.e., the metal film layer in direct contact with the light-emitting element 300) are adjusted to ensure that the bonding effect of different light-emitting elements 300 is balanced, thereby ensuring that the light-emitting element 300 is stably present in the array layer 200. Further, when the metal is irradiated by laser, the heat generated will be transferred, so the first part 241 and the second part 242 in the second metal layer 240 can also be further set differently. Among them, the wavelength of the emitted light of the first light-emitting element 310 is greater than the wavelength of the emitted light of the second light-emitting element 320. Exemplarily, the first light-emitting element 310 is a red light-emitting element, and the second light-emitting element 320 is a green light-emitting element. Considering that the red light-emitting element generates higher heat than the green light-emitting element during bonding, the metal density of the first part 241 that overlaps with the projection of the first light-emitting element 310 can be further adjusted to be less than the metal density of the second part 242 that overlaps with the projection of the first light-emitting element 310.

[0072] Optionally, the array layer 200 may also include other metal traces or metal film layers, such as the metal layer where the gate 2101b is located, or the metal film layer where the drain 2101c and the source 2101d are located. This part of the metal film layer or metal trace can also be set differently, and the metal density of the area where the projection direction of the metal trace to the substrate 100 overlaps with the projection direction of the first light-emitting element 310 on the substrate 100 is adjusted to be relatively small, and the metal density of the area where the projection direction of the metal trace to the substrate 100 overlaps with the projection direction of the second light-emitting element 320 on the substrate 100 is adjusted to be relatively large, that is, the metal traces and metal film layers in the array layer 200 can also be set differently, so as to ensure that the array layer 200 is balanced when bonding with the light-emitting element 300, thereby ensuring the overall structural regularity of the display panel 10 and the overall display effect of the display panel 10. Further, the array layer 200 of the display panel 10 includes multiple metal layers, such as the first metal layer 220 and the second metal layer 230. Along the thickness direction of the display panel 10, the metal layer near the light emitting element 300 absorbs more heat during bonding, and the metal layer far from the light emitting element 300 absorbs less heat during bonding. When the metal density is differentiated, the degree of differential setting of the first metal layer 220 under different light emitting elements 300 can be greater than the degree of differential setting of the second metal layer 230, or the degree of differential setting of the first metal layer 220 under different light emitting elements 300 can be greater than the degree of differential setting of other metal layers in the array layer 200.

[0073] Optional, reference Figure 2 , Figure 5 , Figures 8 to 11 As shown, Figure 5 , Figures 7 to 11 It can be understood as Figure 2 Schematic diagram of the structure of the middle part. Figure 6 and Figure 7 , Figure 7 It can be understood as Figure 6 Schematic diagram of the structure of the part. Figure 2 The first metal layer 220 and the second metal layer 240 are prepared on the entire surface. Figure 6 The first metal layer 220 and the second metal layer 240 are not prepared on the entire surface, that is, the film layer settings of the first metal layer 220 and the second metal layer 240 are diverse and can be differentiated according to different display panels 10. The differentiated settings of the first metal layer 220 and the second metal layer 240 in the display panel 10 are Figure 2 The display panel 10 shown is applicable to Figure 6 This is also applicable to the display panel 10 shown in FIG.

[0074] Fig.12is a schematic structural diagram of a second second metal layer provided in an embodiment of the present invention, Fig.13 is a schematic diagram of the structure of the third second metal layer provided in an embodiment of the present invention, referring to Figure 2 , Fig.12 and Fig.13 As shown, the second metal layer 240 includes a third exhaust hole 251 and a fourth exhaust hole 252, the third exhaust hole 251 is located in the first part 241, and the fourth exhaust hole 252 is located in the second part 242; within a unit area, the sum of the areas of the third exhaust holes 251 is greater than or equal to the sum of the areas of the fourth exhaust holes 252.

[0075] Specifically, the second metal layer 240 includes a third exhaust hole 251 and a fourth exhaust hole 252. Fig.12 and Fig.13 As shown, the third exhaust hole 251 is located in the first part 241, and the fourth exhaust hole 252 is located in the second part 242. Along the thickness direction of the display panel 10, the insulating layer of the second metal layer 240 close to the substrate 100 (the first planarization layer 204 is taken as an example in the figure) will release gas due to heat during the process, and the gas can be discharged through the third exhaust hole 251 and the fourth exhaust hole 252 to avoid the second metal layer 240 and the adjacent insulating layer from peeling off due to the gas, thereby ensuring the overall structural stability of the display panel 10. Optionally, in the second metal layer 240, the fifth exhaust hole 253 can also be prepared in the area that does not overlap with the projection of the light-emitting element 300 to the substrate 100, thereby ensuring the structural stability of the second metal layer 240.

[0076] Furthermore, the difference in metal density between the first portion 241 and the second portion 242 in the region where the projections of different light emitting elements 300 overlap can be achieved by providing exhaust holes with different sums of areas. Fig.12 and Fig.13 As shown, within a unit area, the sum of the areas of the third exhaust holes 251 is greater than or equal to the sum of the areas of the fourth exhaust holes 252. Within a unit area, the sum of the areas of the third exhaust holes 251 is larger, which proves that there are more hollow areas in the first part 241; similarly, within a unit area, the sum of the areas of the fourth exhaust holes 252 is smaller, which proves that there are fewer hollow areas in the second part 242, thereby achieving differentiated settings of the areas in the second metal layer 240 that overlap with the projections of different light-emitting elements 300, thereby ensuring the overall display effect of the display panel 10.

[0077] Continue to refer Fig.12 and Fig.13 As shown, the area of ​​the third exhaust hole 251 is greater than the area of ​​the fourth exhaust hole 252; and / or, within a unit area, the number of the third exhaust holes 251 is greater than the number of the fourth exhaust holes 252.

[0078] Specifically, refer to Fig.13 As shown, the area of ​​the third exhaust hole 251 is larger than that of the fourth exhaust hole 252 . The larger the area of ​​the corresponding exhaust hole is, the larger the area of ​​the metal hollowing out is. This ensures that the metal density of the first part 241 is smaller than the metal density of the second part 242 .

[0079] For further reference, Fig.12 As shown in the middle area D6 and the area D7, within a unit area, the number of the third exhaust holes 251 is greater than the number of the fourth exhaust holes 252. By adjusting the number of the third exhaust holes 251 and the fourth exhaust holes 252, the metal density of the first part 241 is less than the metal density of the second part 242. Fig.13 As shown in the middle area D8 and area D9, within a unit area, the number of the third exhaust holes 251 is greater than the number of the fourth exhaust holes 252, and at the same time, the area of ​​the third exhaust holes 251 is adjusted to be larger than the area of ​​the fourth exhaust holes 252, so as to better ensure that the metal density of the first part 241 is set less than the metal density of the second part 242.

[0080] Fig.14 Schematic diagram of the structure of the fourth second metal layer provided in an embodiment of the present invention, and further reference is made to Figure 1 , Figure 2 , Figures 10 to 14 As shown, the second metal layer 240 also includes a groove 243 and a first connecting unit 244, and the first connecting unit 244 is arranged in the groove 243; the groove 243 includes a first groove 243a and a second groove 243b, and the first connecting unit 244 includes a first connecting portion 244a and a second connecting portion 244b; the first portion 241 surrounds at least a portion of the first groove 243a, the first connecting portion 244a is electrically connected to the first electrode 221 electrically connected to the first light-emitting element 300, and the first connecting portion 244a is insulated from the first portion 241; the second portion 242 surrounds the second groove 243b, the second connecting portion 244b is electrically connected to the first electrode 221 electrically connected to the second light-emitting element 320, and the second connecting portion 244b is insulated from the second portion 242; wherein the orthographic projection area of ​​the first connecting portion 244a on the substrate 100 is S4, and the orthographic projection area of ​​the second connecting portion 244b on the substrate 100 is S5; S4 <S5。

[0081] For further reference, Figure 2 , Figures 10 to 14 Figure 8As shown, the second metal layer 240 includes a first portion 241 and a second portion 242 connected to each other, and also includes a groove 243 and a first connection unit 244 arranged in the groove 243. The groove 243 includes a first groove 243a and a second groove 243b, and the first groove 243a and the second groove 243b are arranged at different positions. The first connection portion 244a is arranged in the first groove 243a, and the second connection portion 244b is arranged in the second groove 243b. The first connection portion 244a and the second connection portion 244b can also be arranged differently, so as to further ensure the bonding effect of different light-emitting elements 300 and the array layer 200.

[0082] Specifically, the first portion 241 surrounds at least a portion of the first groove 243a, and the first connecting portion 244a in the first groove 243a is electrically connected to the first electrode 221 electrically connected to the first light-emitting element 310. Since the first groove 243a exists between the first portion 241 and the first connecting portion 244a, the first portion 241 and the first connecting portion 244a are insulated. Figure 2 , Figure 3 , Figures 10 to 14 As shown, the first connection portion 244a can be understood as a cross-layer connection structure, which is used to electrically connect the first light-emitting element 310 to the driving circuit 210 through the first electrode 221 and the first connection portion 244a. Similarly, the second portion 242 surrounds at least a portion of the second groove 243b, and the second connection portion 244b in the second groove 243b is electrically connected to the first electrode 221 electrically connected to the second light-emitting element 320. Since the second groove 243 exists between the second portion 242 and the second connection portion 244b, the second portion 242 and the second connection portion 244b are insulated. Figure 2 , Figure 3 , Figures 10 to 14 The second connection portion 244b can be understood as a cross-layer connection structure, which is used to electrically connect the second light-emitting element 320 to the driving circuit 210 through the first electrode 221 and the second connection portion 244b.

[0083] In order to ensure the bonding effect of the light-emitting elements 300 of different colors at the array layer 200, specifically, the metal density of the first electrode 221 electrically connected to the first light-emitting element 310 is adjusted to be smaller than the metal density of the second electrode 221 electrically connected to the second light-emitting element 320. In which, the first connecting portion 244a is electrically connected to the first electrode 221 electrically connected to the first light-emitting element 310, and the second connecting portion 244b is electrically connected to the first electrode 221 electrically connected to the second light-emitting element 320. When laser irradiation is performed, the heat generated may be jointly generated by the first electrode 221 and the first connecting unit 244 electrically connected thereto, so in order to ensure the uniformity of bonding, reference is made to FIG. Fig.14 As shown, the orthographic projection area of ​​the first connecting portion 244a on the substrate 100 can be further adjusted to be smaller than the orthographic projection area of ​​the second connecting portion 244b on the substrate 100, so as to ensure the overall structural regularity and display effect of the display panel 10. Further, the adjustment of the projection area of ​​the first connecting portion 244a and the second connecting portion 244b can be achieved by adjusting the specific size and shape of the first connecting portion 244a and the second connecting portion 244b, or adjusting the number and opening area of ​​the exhaust holes provided on the first connecting portion 244a and the second connecting portion 244b, which is not specifically limited in the embodiment of the present invention.

[0084] Optional, corresponding reference can also be made Figure 6 and Figure 7 When the second metal layer 240 and the first metal layer 220 are not prepared on the entire surface, the first groove 243a and the second groove 243b can be connected.

[0085] For further reference, Figure 2 , Figures 10 to 14 As shown, the orthographic projection area of ​​the first groove 243a on the substrate 100 is S6, and the orthographic projection area of ​​the second groove 243b on the substrate 100 is S7; wherein S6≥S7.

[0086] For further reference, Figure 2 , Figures 10 to 14 As shown, the first slot 243a and the second slot 243b can be set differently, so that the orthographic projection area of ​​the first slot 243a on the substrate 100 is different from the orthographic projection area of ​​the second slot 243b on the substrate 100. Specifically, if the setting area of ​​the first slot 243a is larger, the corresponding area of ​​the first part 241 will be smaller, that is, the larger the first slot 243a is, the more the first part 241 is etched to form a slot; similarly, if the setting area of ​​the second slot 243b is smaller, the corresponding area of ​​the second part 242 will be larger, that is, the larger the second slot 243b is, the more the second part 242 is retained, so that the metal density of the first part 241 can be less than the metal density of the second part 242. By further setting the second metal layer 240, it can be ensured that the bonding degree between different light-emitting elements 300 and the array layer 200 is the same or similar, thereby ensuring the overall display effect of the display panel 10.

[0087] Fig.15 is a schematic diagram of a driving circuit provided by an embodiment of the present invention, with reference to Fig.15 As shown, the display panel 10 further includes a power signal line, and the power signal line includes a positive power signal line PVDD; the first portion 241 and the second portion 242 are both electrically connected to the positive power signal line PVDD.

[0088] Exemplary, reference Fig.15 As shown, the driving circuit 210 is illustrated by "7T1C". Based on the setting mode of the driving circuit 210, those skilled in the art can make adaptive adjustments according to the needs. The driving circuit 210 may include a first light-emitting control transistor T1, a data writing transistor T2, a driving transistor T3, a threshold compensation transistor T4, an initialization reset transistor T5, a second light-emitting control transistor T6, an anode reset transistor T7 and a storage capacitor Cst. Optionally, the types of transistors in the driving circuit 210 may be diverse. The transistor may include a low-temperature polysilicon transistor (LTPS), which has the advantages of high switching speed, high carrier mobility and low power. It should be noted that the form of the driving circuit 210 in the display panel 10 provided in the embodiment of the present invention is diverse, and the embodiment of the present invention is not illustrated one by one here.

[0089] Among them, the input end of the first light-emitting control transistor T1 in the driving circuit 210 is electrically connected to the positive power signal line PVDD, that is, the positive power signal line PVDD is electrically connected to the driving circuit 210, and the positive power signal line PVDD is electrically connected to one end of the light-emitting element 300 through the driving circuit 210, and the other end of the light-emitting element 300 is electrically connected to the negative power signal line PVEE.

[0090] Specifically, the timing operation process of the driving circuit 210 is as follows: the scanning signal line (shown as S1 in the figure) connected to the control end of the initialization reset transistor T5 can control the on and off of the initialization reset transistor T5, and when the initialization reset transistor T5 is turned on, the initialization signal in the initialization signal line (shown as Vref1 in the figure) connected to the input end of the initialization reset transistor T5 is written to the gate of the driving transistor T3, that is, the initialization signal includes a gate initialization signal, and the first node N1 is reset. The storage capacitor Cst is set to ensure that the potential of the first node N1 is stable. The scanning signal line (shown as SP in the figure) connected to the control end of the data write transistor T2 can control the on and off of the data write transistor T2, and when the data write transistor T2 is turned on, the data signal on the data signal line (shown as Vdata in the figure) is written to the first electrode of the driving transistor T3. The scanning signal line (shown as S2 in the figure) connected to the control end of the threshold compensation transistor T4 can control the on and off of the threshold compensation transistor T4, and perform threshold voltage compensation on the driving transistor T3 when the threshold compensation transistor T4 is turned on; at the same time, the scanning signal line (shown as SP in the figure) connected to the control end of the anode reset transistor T7 can control the on and off of the anode reset transistor T7, and reset the anode of the light-emitting element 300 connected to the pixel circuit when the anode reset transistor T7 is turned on, that is, the initialization signal on the anode initialization signal line (shown as Vref2 in the figure) is written to the anode of the light-emitting element 300, that is, the initialization signal includes the anode initialization signal. The light-emitting control signal line (shown as Emit in the figure) connected to the control end of the first light-emitting control transistor T1 and the control end of the second light-emitting control transistor T6 can control the on and off of the control end of the first light-emitting control transistor T1 and the second light-emitting control transistor T6, and when the first light-emitting control transistor T1 and the second light-emitting control transistor T6 are turned on, the power signal transmitted by the positive power signal line PVDD is written to the anode of the light-emitting element 300, and the cathode of the light-emitting element 300 is connected to the negative power signal line PVEE, thereby realizing the display and light emission of the light-emitting element 300.

[0091] Exemplary, combined Figures 2 to 4 , Figures 10 to 14 As shown, the first part 241 and the second part 242 are both electrically connected to the positive power signal line PVDD, that is, the first section 241 and the second section 242 connected to each other in the second metal layer 240 are connected to the positive power signal line PVDD; and the first connection unit 244 in the second metal layer 240 is electrically connected to the first electrode 221, so the first connection unit 244 is insulated from the positive power signal line PVDD.

[0092] Furthermore, the display panel 10 further includes a power signal line, and the power signal line includes a negative power signal line PVEE; the second electrode 222 is electrically connected to the negative power signal line PVEE.

[0093] refer to Fig.14 As shown, the positive power signal line PVDD is electrically connected to one end of the light emitting element 300 through the driving circuit 210, and the other end of the light emitting element 300 is electrically connected to the negative power signal line PVEE. In the array layer 200, the first electrode 221 can be understood as an electrical connection bridge between the light emitting element 300 and the driving circuit 210, and the second electrode 222 is the input of the negative power signal to the light emitting element 300. Figures 2 to 4 , Figures 8 to 10 As shown, the light emitting element 300 is electrically connected to the negative power signal line PVEE through the second electrode 222 , thereby realizing display driving of the light emitting element 300 .

[0094] Optionally, the light emitting element 300 includes a micro light emitting element or a mini light emitting element.

[0095] Optionally, the light emitting element 300 may be a micro light emitting diode (Micro Light Emitting Diode, MicroLED). Micro LED has the advantages of good display performance, small size, low power, etc., and has broad application prospects. In other embodiments, the light emitting element 300 may also adopt other types of light emitting diodes, such as Mini LED, etc. Those skilled in the art may set them according to actual needs, and the embodiments of the present invention are not limited to this.

[0096] Based on the same inventive concept, an embodiment of the present invention provides a method for preparing a display panel. Fig.16 is a flow chart of a method for preparing a display panel provided by an embodiment of the present invention, with reference to Fig.16 As shown, the preparation method comprises:

[0097] S110, providing a substrate.

[0098] S120, providing an array layer, the array layer being located on one side of the substrate, the array layer comprising a driving circuit and a first metal layer, the first metal layer being located on a side of the driving circuit away from the substrate; the first metal layer comprising a first electrode and a second electrode.

[0099] Among them, the preparation of the display panel requires the preparation of the substrate and the array layer on one side of the substrate, wherein the array layer includes a driving circuit, and the light-emitting element subsequently transferred by the display panel is electrically connected to the driving circuit, and the light-emitting effect of the display panel is realized by driving the light-emitting element 300 by the driving circuit. Specifically, the driving circuit includes at least one transistor, and the transistor is electrically connected to the light-emitting element to provide a driving current for the light-emitting element, thereby ensuring the normal display of the display panel. Further, the driving circuit may include "4T1C", "7T1C" and "8T1C", etc., where "T" represents a transistor and "C" represents a capacitor. Further, the array layer includes a plurality of stacked film layers, such as a gate insulating layer, a first interlayer insulating layer, a second interlayer insulating layer, a first planarizing layer and a second planarizing layer, etc. For the specific film layer setting type and quantity in the array layer, it can be adaptively adjusted according to different requirements, and the embodiment of the present invention does not make specific restrictions here. Further, the transistor includes: an active layer, a gate, a drain and a source. For the specific setting of the transistor, it can also be adaptively adjusted according to requirements, and the embodiment of the present invention does not make specific restrictions on this.

[0100] Further, the array layer also includes a first metal layer, the first metal layer is located on a side of the driving circuit away from the substrate, and the first metal layer includes a first electrode and a second electrode, wherein the first electrode and the second electrode are insulated. Although the light-emitting element transferred subsequently is electrically connected to both the first electrode 221 and the second electrode 222, the first electrode and the second electrode provide different electrical signals for the light-emitting element. The light-emitting element transferred subsequently is electrically connected to the driving circuit via the first electrode. Further, the first electrode and the second electrode can be understood as two pads, and the transferred light-emitting element includes a first connection structure and a second connection structure, which can be achieved by bonding the first connection structure to the first pad on the first electrode and bonding the second connection structure to the second pad on the second electrode, that is, achieving electrical connection between the light-emitting element and the two pads, ensuring the driving of the light-emitting element, thereby achieving display luminescence of the display panel.

[0101] S130, providing a light emitting element carrying substrate.

[0102] A light-emitting element carrier substrate is provided, and the light-emitting element carrier substrate includes a plurality of light-emitting elements; and the light-emitting elements include a first light-emitting element and a second light-emitting element with different light-emitting colors. The light-emitting elements of different colors are transferred to the array layer through the carrier substrate, so as to ensure the color display effect of the display panel.

[0103] S140, placing the light emitting element carrying substrate opposite to the array layer, and controlling the light emitting element to be attached to the first electrode and the second electrode.

[0104] Specifically, a carrier substrate with light-emitting elements of different colors is placed opposite to the array layer, and the first electrode and the second electrode are controlled to be bonded to the light-emitting element. Further, the first light-emitting element includes a first connection structure and a second connection structure, wherein the first connection structure of the first light-emitting element is aligned and bonded to the first electrode through a first solder pad, and the second connection structure of the first light-emitting element is aligned and bonded to the second electrode through a second solder pad; the second light-emitting element is similar.

[0105] S150, use laser to scan the light-emitting element and the first electrode to control the light-emitting element to be electrically connected to the driving circuit through the first electrode; use laser to scan the light-emitting element and the second electrode to control the light-emitting element to be electrically connected to the second electrode.

[0106] When the first light-emitting element and the second light-emitting element are transferred to the array layer through the carrier substrate and electrically connected to the first electrode and the second electrode, the connection between the light-emitting element and the first electrode and the second electrode is scanned by laser to perform welding so as to realize the electrical connection between the two, that is, to realize the electrical connection between the light-emitting element and the array layer, so as to ensure the driving circuit in the array layer to drive the light-emitting element and ensure the display function of the display panel. The difference in the structure of the light-emitting elements of different colors (the first light-emitting element and the second light-emitting element have differences in their own structure) leads to differences in the bonding degree between the first pad on the first electrode and the different light-emitting elements when the same laser is used to irradiate the different light-emitting elements and the first electrode. Exemplarily, the first light-emitting element is a red light-emitting chip, and the second light-emitting element is a blue light-emitting chip or a green light-emitting chip. When laser irradiation is used for welding, the temperature generated when the red light-emitting chip is bonded to the first pad on the corresponding first electrode will be higher than the temperature generated when the blue light-emitting chip is bonded to the first pad on the corresponding first electrode, or the temperature generated when the red light-emitting chip is bonded to the first pad on the corresponding first electrode will be higher than the temperature generated when the green light-emitting chip is bonded to the first pad on the corresponding first electrode. Different temperatures will have different effects on the bonding effect.

[0107] In order to ensure that the degree of bonding between the light-emitting elements at various positions in the display panel and the array layer is the same or similar, the first electrode can be adjusted accordingly to ensure that when each light-emitting element is transferred to the array layer for bonding, the same laser can be used for synchronous irradiation, and the degree of bonding between each light-emitting element and the array layer is the same or similar, thereby ensuring the overall structural stability of the display panel and improving the overall display effect of the display panel.

[0108] Specifically, the orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element on the substrate is S1, and the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element on the substrate is S2; wherein, |S1-S2|>0, indicating that S1 and S2 are different. In other words, there is a difference between the orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element and the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element on the substrate. By differentially arranging the first electrodes electrically connected to light-emitting elements of different colors, it can be ensured that the degree of bonding between different light-emitting elements and the array layer is similar, thereby ensuring that the overall structure of the display panel is more stable.

[0109] Among them, when the first electrode is electrically connected to the corresponding light-emitting element, the first pad on the first electrode and the first connection structure of the light-emitting element are melted by laser irradiation to achieve bonding electrical connection. When the laser is irradiated, heat will be generated at the first electrode and the first connection structure. If the heat generated is too large, the electrodes at the first electrode and the first connection structure will be over-melted and short-circuited. If the heat generated is too small, the first electrode and the first connection structure will be virtually connected. Both will affect the driving effect of the driving circuit on the light-emitting element, and then affect the overall display effect of the display panel. Furthermore, the relative contact area of ​​the first electrode and the first connection structure will directly affect the heat generated during welding, and the first connection structure corresponding to the light-emitting element is generally regulated, so the size of the first electrode can be adjusted to achieve differentiated settings of the contact area of ​​the first electrode and the first connection structure. Specifically, the size of the first electrode corresponding to the light-emitting element that is prone to generate high heat can be smaller than the size of the first electrode corresponding to other light-emitting elements, thereby ensuring that when light-emitting elements of different colors are welded with the corresponding first electrodes, the temperatures generated when they melt are the same or similar, ensuring the same or similar degree of bonding, thereby improving the bonding effect between the light-emitting element and the array layer, ensuring the overall structural uniformity of the display panel, and ensuring the overall display effect of the display panel.

[0110] Optionally, the display panel can also reserve space for redundant light-emitting elements. The redundant light-emitting elements can emit light and display when there is an abnormality in the adjacent light-emitting elements and they are not repaired in time, thereby ensuring the overall display effect of the display panel. For example, when it is detected that the red light-emitting element is defective and cannot emit light, another redundant light-emitting element that is close to the red light-emitting element is fixed. The abnormal red light-emitting element can be repaired using the redundant light-emitting element that is close to the distance. The red light-emitting element that was fixed first remains in its original position, so that there are two light-emitting elements emitting red light in the area. Redundant light-emitting elements may not be set in the display panel, which reflects the flexibility and diversity of the display panel setting.

[0111] In summary, in the method for preparing a display panel provided in an embodiment of the present invention, the orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element on the substrate is different from the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element on the substrate, thereby ensuring that the bonding effects between light-emitting elements of different colors and the first electrode are the same or similar, ensuring the overall structural stability of the display panel, and thus improving the display effect of the display panel.

[0112] Based on the same inventive concept, an embodiment of the present invention further provides a display device, Fig.17 is a schematic diagram of the structure of a display device provided by an embodiment of the present invention, such as Fig.17 As shown, the display device 1 includes the display panel 10 described in any of the above embodiments. Therefore, the display device 1 provided in the embodiment of the present invention has the corresponding beneficial effects of the above embodiments, which will not be repeated here. The display device 1 can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and a car display device.

[0113] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: include: substrate; an array layer, the array layer being located at one side of the substrate, the array layer comprising a driving circuit and a first metal layer, the first metal layer being located at a side of the driving circuit away from the substrate; the first metal layer comprising a first electrode and a second electrode; a light emitting element, the light emitting element being located at a side of the array layer away from the substrate, the light emitting element being electrically connected to the driving circuit via the first electrode, and the light emitting element being electrically connected to the second electrode; The light-emitting element comprises a first light-emitting element and a second light-emitting element, wherein the light-emitting color of the first light-emitting element is different from the light-emitting color of the second light-emitting element; The orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element on the substrate is S1, and the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element on the substrate is S2; wherein |S1-S2|>0.

2. The display panel according to claim 1, characterized in that: The wavelength of the emitted light of the first light emitting element is a1, and the wavelength of the emitted light of the second light emitting element is a2; Among them, a2<a1, and S1<S2.

3. The display panel according to claim 2, characterized in that: The light-emitting element further includes a third light-emitting element, the emission wavelength of the third light-emitting element is a3, and the orthographic projection area of ​​the first electrode electrically connected to the third light-emitting element on the substrate is S3; Among them, a3 <a2,|S2-S3| / S3≤20%。 4. The display panel according to claim 2, characterized in that: Along a first direction, a length of the first electrode electrically connected to the first light-emitting element is shorter than a length of the first electrode electrically connected to the second light-emitting element; and / or, along the second direction, the length of the first electrode electrically connected to the first light-emitting element is shorter than the length of the first electrode electrically connected to the second light-emitting element; The first direction intersects with the second direction and is parallel to the plane where the substrate is located.

5. The display panel according to claim 2, characterized in that: The first electrode electrically connected to the first light-emitting element includes at least one first exhaust hole, and the first electrode electrically connected to the second light-emitting element includes at least one second exhaust hole; Within a unit area, the sum of the areas of the first exhaust holes is greater than or equal to the sum of the areas of the second exhaust holes.

6. The display panel according to claim 5, characterized in that: The area of ​​the first exhaust hole is greater than the area of ​​the second exhaust hole; and / or, within a unit area, the number of the first exhaust holes is greater than the number of the second exhaust holes.

7. The display panel according to claim 2, characterized in that: The array layer further includes a second metal layer, and the second metal layer is located on a side of the first metal layer close to the driving circuit; The second metal layer includes a first part and a second part which are electrically connected to each other, and the first part and the second part are insulated from the first electrode; the orthographic projection of the first part on the substrate at least partially overlaps with the orthographic projection of the first light-emitting element on the substrate, and the orthographic projection of the second part on the substrate at least partially overlaps with the orthographic projection of the second light-emitting element on the substrate; wherein the metal density of the first part is less than the metal density of the second part.

8. The display panel according to claim 7, characterized in that: The second metal layer comprises a third exhaust hole and a fourth exhaust hole, the third exhaust hole is located in the first portion, and the fourth exhaust hole is located in the second portion; Within a unit area, the sum of the areas of the third exhaust holes is greater than or equal to the sum of the areas of the fourth exhaust holes.

9. The display panel according to claim 8, characterized in that: The area of ​​the third exhaust hole is greater than the area of ​​the fourth exhaust hole; and / or, within a unit area, the number of the third exhaust holes is greater than the number of the fourth exhaust holes.

10. The display panel according to claim 7, characterized in that: The second metal layer further includes a groove and a first connection unit, wherein the first connection unit is disposed in the groove; the groove includes a first groove and a second groove, and the first connection unit includes a first connection portion and a second connection portion; The first portion surrounds at least a portion of the first groove, the first connecting portion is electrically connected to the first electrode electrically connected to the first light-emitting element, and the first connecting portion is insulated from the first portion; the second portion surrounds at least a portion of the second groove, the second connecting portion is electrically connected to the first electrode electrically connected to the second light-emitting element, and the second connecting portion is insulated from the second portion; The orthographic projection area of ​​the first connecting portion on the substrate is S4, and the orthographic projection area of ​​the second connecting portion on the substrate is S5; S4 <S5。 11. The display panel according to claim 10, characterized in that: The orthographic projection area of ​​the first groove on the substrate is S6, and the orthographic projection area of ​​the second groove on the substrate is S7; Among them, S6≥S7.

12. The display panel according to claim 7, characterized in that: The display panel further includes a power signal line, and the power signal line includes a positive power signal line; the first portion and the second portion are both electrically connected to the positive power signal line.

13. The display panel according to claim 1, characterized in that: The display panel further comprises a power signal line, wherein the power signal line comprises a negative power signal line; The second electrode is electrically connected to the negative power signal line.

14. The display panel according to claim 1, characterized in that: The light emitting element includes a micro light emitting element or a mini light emitting element.

15. A method for preparing a display panel, characterized in that: providing a substrate; Providing an array layer, the array layer is located on one side of the substrate, the array layer includes a driving circuit and a first metal layer, the first metal layer is located on a side of the driving circuit away from the substrate; the first metal layer includes a first electrode and a second electrode; the first electrode is electrically connected to the driving circuit; A light-emitting element carrier substrate is provided, wherein the light-emitting element carrier substrate comprises a plurality of light-emitting elements; the light-emitting elements comprise a first light-emitting element and a second light-emitting element, and the light-emitting color of the first light-emitting element is different from the light-emitting color of the second light-emitting element; The light-emitting element carrying substrate is placed opposite to the array layer, and the light-emitting element is controlled to be attached to the first electrode and the second electrode; wherein the orthographic projection area of ​​the first electrode electrically connected to the first light-emitting element to the substrate is S1, and the orthographic projection area of ​​the first electrode electrically connected to the second light-emitting element to the substrate is S2; wherein |S1-S2|>0; The light emitting element and the first electrode are scanned by laser to control the light emitting element to be electrically connected to the driving circuit via the first electrode; the light emitting element and the second electrode are scanned by laser to control the light emitting element to be electrically connected to the second electrode.

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

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