Display panel, preparation method and display device

Abstract

The invention provides a display panel, a preparation method and a display device.The display panel comprises a first substrate and a second substrate, the first substrate comprises a plurality of first sub-substrates, and a first splicing seam exists between every two adjacent first sub-substrates; the second substrate is located on one side of the first substrate and comprises a plurality of second sub-substrates, a light-emitting element is arranged between the first substrate and the second substrate, a second splicing seam exists between the adjacent second sub-substrates, and the first splicing seam and the second splicing seam are not overlapped in the thickness direction of the display panel; at least one light-emitting element is arranged between the orthographic projection of the second splicing seam on the first substrate and the first splicing seam; the influence of light scattering at the splicing seam on display is weakened, and the overall visual effect, mechanical property and stability of the display panel are greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a preparation method thereof, and a display device. Background Art

[0002] Light Emitting Diode (LED) display technology is a display method that directly uses LED as pixels. Color LED display screens are composed of red, green and blue LEDs as basic light-emitting elements, and are arranged in a dot matrix. LED display screens are usually composed of display modules, control systems and power systems. The control system controls the on and off of LEDs to emit different colors of light, thereby forming an image. The smaller the LED crystal particles, the smaller the pixel size of the display screen, and the more delicate the display effect. In recent years, LED crystal particles have been increasingly widely used in micron-level display screens.

[0003] However, the current LED display screens include mini light-emitting diodes and micro semiconductor light-emitting diodes, namely mini-LED and micro-LED. Due to the limitations of LED chip mass transfer technology, large-screen display cannot be achieved directly. Splicing screen technology came into being. The splicing screen uses multiple display screens spliced ​​together to form a large display screen.

[0004] However, the current Micro-LED technology in the field of large-size displays is limited by existing technical solutions and process procedures, and still has technical problems such as large seams and visual differences at the joints. Summary of the invention

[0005] The problem solved by the present invention is to provide a display panel and a preparation method thereof, which weakens the influence of light scattering at the joints on the display, thereby greatly improving the overall visual effect, mechanical properties and stability of the display panel.

[0006] To solve the above problems, the present invention provides a display panel comprising: a first substrate, comprising a plurality of first sub-substrates, and a first joint seam exists between adjacent first sub-substrates; a second substrate located on one side of the first substrate, comprising a plurality of second sub-substrates, and a light-emitting element is provided between the first substrate and the second substrate, and a second joint seam exists between adjacent second sub-substrates, and along the thickness direction of the display panel, the first joint seam and the second joint seam do not overlap; the second joint seam includes at least one light-emitting element between the orthographic projection of the first substrate and the first joint seam.

[0007] Correspondingly, the present invention also provides a method for preparing a display panel, comprising: providing a plurality of first sub-substrates, each of which has a plurality of light-emitting elements; providing a plurality of second sub-substrates; splicing the plurality of first sub-substrates into a first substrate, wherein a first splicing seam exists between adjacent first sub-substrates; splicing a plurality of second sub-substrates into a second substrate, wherein the second substrate covers the first substrate, wherein a second splicing seam exists between adjacent second sub-substrates, and along the thickness direction of the display panel, the first splicing seam and the second splicing seam do not overlap; and the second splicing seam includes at least one light-emitting element between the orthographic projection of the first substrate and the first splicing seam.

[0008] Correspondingly, the present invention further provides a display device, comprising any one of the display panels described above.

[0009] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0010] In the technical solution of the display panel of the present invention, the first substrate includes a plurality of first sub-substrates, and a first splicing seam exists between adjacent first sub-substrates; a second substrate is located on one side of the first substrate, the second substrate includes a plurality of second sub-substrates, the light-emitting element is located between the first substrate and the second substrate, and a second splicing seam exists between adjacent second sub-substrates, along the thickness direction of the display panel, the first splicing seam and the second splicing seam do not overlap, and the second splicing seam includes at least one light-emitting element between the orthographic projection of the second splicing seam on the first substrate and the first splicing seam, and the first splicing seam and the second splicing seam do not overlap, that is, the first splicing seam and the second splicing seam are shifted and arranged, The influence of light scattering at the joint seam on the display is weakened, and the first joint seam of the adjacent first sub-substrate is supported by the second sub-substrate, and the second joint seam of the adjacent second sub-substrate is supported by the first sub-substrate, so that the first joint seam and the second joint seam are not easily pushed apart by external force, so that the display panel has better mechanical properties and stability; at the same time, the second joint seam includes at least one light-emitting element between the orthographic projection of the second joint seam on the first substrate and the first joint seam, and the first joint seam and the second joint seam fall between the gaps of the light-emitting elements, which will not interfere with the light emission of the light-emitting elements, greatly improving the overall visual effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of a display panel in the first embodiment of the present invention;

[0012] Figure 2 for Figure 1 A top view of

[0013] Figure 3 It is a structural schematic diagram of a display panel in another embodiment of the present invention;

[0014] Figure 4 It is a structural schematic diagram of a display panel in yet another embodiment of the present invention;

[0015] Figure 5 It is a structural schematic diagram of a display panel in yet another embodiment of the present invention;

[0016] Figure 6 is a schematic structural diagram of a display panel in a second embodiment of the present invention;

[0017] Figure 7 It is a structural schematic diagram of a display panel in yet another embodiment of the present invention;

[0018] Figure 8 is a schematic structural diagram of a display panel in a third embodiment of the present invention;

[0019] Fig. 9 is a schematic structural diagram of a display panel in a fourth embodiment of the present invention;

[0020] Fig.10 A flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0021] Fig.11 A schematic diagram of the structure of a display device provided by an embodiment of the present invention;

[0022] Fig.12 A schematic diagram of splicing display panels provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] Currently, Micro-LED technology in the field of large-size displays is limited by existing technical solutions and process procedures, and still has technical problems such as large seams and visual differences at joints.

[0024] After research, the inventors also found that by not overlapping the first splicing seam and the second splicing seam, that is, shifting the first splicing seam and the second splicing seam, the influence of light scattering at the splicing seam on the display is weakened, and the first splicing seam of adjacent first sub-substrates is supported by the second sub-substrate, and the second splicing seam of adjacent second sub-substrates is supported by the first sub-substrate, so that the first splicing seam and the second splicing seam are not easily pushed apart by external force, so that the display panel has better mechanical properties and stability; at the same time, the second splicing seam includes at least one light-emitting element between the orthographic projection of the second splicing seam on the first substrate and the first splicing seam, and the first splicing seam and the second splicing seam fall between the gaps of the light-emitting elements, which will not interfere with the light emission of the light-emitting elements, greatly improving the overall visual effect of the display panel.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] A display panel 400 includes a first substrate 100 and a second substrate 200, wherein the second substrate 200 is located on one side of the first substrate 100, wherein the first substrate 100 includes a plurality of first sub-substrates 101, a first splicing seam exists between adjacent first sub-substrates 101, the second substrate 200 includes a plurality of second sub-substrates 201, a light-emitting element 300 is provided between the first substrate 100 and the second substrate 200, a first splicing seam 102 exists between adjacent first sub-substrates 101, a second splicing seam 202 exists between adjacent second sub-substrates 201, along the thickness direction of the display panel 400, the first splicing seam 102 and the second splicing seam 202 do not overlap, and the second splicing seam 202 includes at least one light-emitting element 300 between the orthographic projection of the first substrate 100 and the first splicing seam 102; the first splicing seam 102 and the second splicing seam 202 do not overlap, that is, the first splicing seam 102 and the second splicing seam 202 are shifted to weaken the influence of light scattering at the splicing seams (the first splicing seam and the second splicing seam) on the display, and the first splicing seam 102 of the adjacent first sub-substrate 101 is supported by the second sub-substrate 201, and the second splicing seam 202 of the adjacent second sub-substrate 201 is supported by the first sub-substrate 101, so that the first splicing seam 102 and the second splicing seam 202 are not easily pushed apart by external force, so that the display panel 400 has good mechanical properties and stability; at the same time, the second splicing seam 202 includes at least one light-emitting element 300 between the orthographic projection of the second splicing seam 202 on the first substrate 100 and the first splicing seam 102, and the first splicing seam 102 and the second splicing seam 202 fall between the gaps of the light-emitting elements 300, and will not interfere with the light emission of the light-emitting elements 300, thereby greatly improving the overall visual effect of the display panel 400.

[0027] First embodiment

[0028] In this embodiment, please refer to Figure 1 and Figure 2 The display panel 400 includes a first substrate 100 and a second substrate 200 located on one side of the first substrate 100. The first substrate 100 includes a plurality of first sub-substrates 101. A first joint 102 exists between adjacent first sub-substrates 101. The first sub-substrate 101 has a plurality of light-emitting elements 300. The second substrate 200 includes a plurality of second sub-substrates 201. A second joint 202 exists between adjacent second sub-substrates 201. In the thickness direction of the display panel 400, the first joint 102 and the second joint 202 do not overlap. The second joint 202 includes at least one light-emitting unit 301 between the orthographic projection of the first substrate 100 and the first joint 102. The light-emitting unit 301 includes at least two light-emitting elements 300 of different colors.

[0029] Figure 1 for Figure 2 Exploded view of the cross section at AA, Figure 2 for Figure 1 A top view of the display panel 400, wherein the thickness direction of the display panel 400 is set as the Y direction.

[0030] In some embodiments, the light emitting element 300 may also be located on the second sub-substrate 201 .

[0031] In this embodiment, the first sub-substrate 101 includes a glass substrate 101a, and the entire surface of the glass substrate 101a facing the second sub-substrate 201 includes a TFT layer 101b of a TFT (thin film transistor) circuit, a TFT circuit 101c of the TFT layer, and a side wiring 101d, and the side wiring 101d is used to electrically connect the circuit set on the rear surface.

[0032] In this embodiment, the light emitting element 300 includes a plurality of LEDs arranged in an array, which can emit red light, green light, blue light, etc. The light emitting unit 301 includes at least two light emitting elements 300 of different colors.

[0033] In this embodiment, a surface of the second sub-substrate 201 facing the first sub-substrate 101 has a plurality of color resists 201 a , and the color resists 201 a correspond to the light emitting elements 300 one by one.

[0034] Specifically, the color resist 201a generally obtains three primary colors of red, green and blue by using pigments or dyes as colorants.

[0035] Among them, the method for forming the second substrate 200 includes: providing a transparent substrate 201b, making a second shading layer 201c on the transparent substrate, distributing and coating three colors of filter materials of red, green and blue on the second shading layer 201b, and forming a plurality of color resists 201a through exposure, development and etching processes.

[0036] After forming the color resist, an ITO layer (not shown in the figure) is also formed to ensure that current can pass through each color resist; and a protective layer (not shown in the figure) is formed on the ITO layer to protect the entire CF layer from damage.

[0037] In this embodiment, the first substrate 100 and the second substrate 200 are fixedly attached by a connecting member (not shown in the figure). Specifically, the connecting member is an optically clear adhesive (OCA) having advantages such as high light transmittance and high adhesion.

[0038] Of course, the connecting parts can also be made of other materials, as long as their light transmittance and adhesion meet the actual requirements, and there is no limitation here.

[0039] In this embodiment, the first sub-substrate 101 and the second sub-substrate 201 have the same shape, specifically, the first sub-substrate 101 has two mutually parallel and identical first bottom surfaces and a plurality of first side surfaces formed in the shape of a parallelogram; the second sub-substrate 201 has two mutually parallel and identical second bottom surfaces and a plurality of second side surfaces formed in the shape of a parallelogram, for example, the first bottom surface and the second bottom surface are rectangular.

[0040] In some embodiments, the first bottom surface and the second bottom surface may also be in a square shape, a triangle shape, a diamond shape, or the like.

[0041] Figure 1 The adjacent first sub-substrates 101 at the first joint seam 102 are separated, and the adjacent second sub-substrates 201 at the second joint seam 202 are separated.

[0042] In this embodiment, three light-emitting elements 300 are included between the first splicing seam 102 and the second splicing seam 102 and the orthographic projection on the first substrate 100, so that the first splicing seam 102 and the second splicing seam 202 are shifted to weaken the influence of light scattering at the splicing seam on the display, and the first splicing seam 102 and the second splicing seam 202 fall between the gaps of the light-emitting elements 300, which will not interfere with the light emission of the light-emitting elements 300, thereby greatly improving the overall visual effect of the display panel 400; at the same time, the bottom of the first splicing seam 102 is a whole second sub-substrate 201, so that when the first splicing seam 102 is subjected to external force, the second sub-substrate 201 is supported, and similarly, the bottom of the second splicing seam 202 is a whole first sub-substrate 101, so that when the second splicing seam 202 is subjected to external force, the first sub-substrate 101 is also supported, so that the first splicing seam 102 and the second splicing seam 202 are not easily pushed apart by external force, so that the display panel 400 has good mechanical properties and stability.

[0043] In this embodiment, please refer to Figure 1 A first light shielding layer 101 e is provided on the surface of the first sub-substrate 101 facing the second sub-substrate 201 , and along the thickness direction of the display panel 400 , the second joint seam 202 overlaps the first light shielding layer 101 e .

[0044] In this embodiment, the first light shielding layer 101e is used to achieve an optical compensation effect at the second joint seam 202, thereby realizing seamless display.

[0045] Please continue to refer to Figure 1 A second light shielding layer 201 c is provided on the surface of the second sub-substrate 201 facing the first sub-substrate 101 , and along the thickness direction of the display panel 400 , the first joint seam 102 overlaps the second light shielding layer 201 c .

[0046] In this embodiment, the second light shielding layer 201 c is used to achieve an optical compensation effect at the first joint seam 102 , thereby realizing seamless display.

[0047] In this embodiment, a second light shielding layer 201c is also provided between adjacent color resists 201a.

[0048] In some embodiments, please refer to Figure 3 The second joint seam 202 includes at least one light-emitting unit 301 between the orthographic projection of the second joint seam 202 on the first substrate 100 and the first joint seam 102 . The light-emitting unit 301 includes two light-emitting elements 300 of different colors.

[0049] In some embodiments, please refer to Figure 4 The second joint seam 202 includes a light emitting element 300 between the orthographic projection of the second joint seam 202 on the first substrate 100 and the first joint seam 102 .

[0050] In this embodiment, please refer to Figure 1 The dimension (L1) of the first sub-substrate 101 in the direction perpendicular to the thickness of the display panel 400 and the extension direction of the first splicing seam 102 is smaller than the dimension (L2) of the second sub-substrate 201 in the direction perpendicular to the thickness of the display panel 400 and the extension direction of the first splicing seam 102, which helps to facilitate subsequent electrical connections and ensure the integrity and stability of the circuit.

[0051] In some embodiments, please refer to Figure 5 The dimension (L1) of the first sub-substrate 101 in the direction perpendicular to the thickness of the display panel 400 and perpendicular to the extension direction of the first joint seam 102 is greater than the dimension (L2) of the second sub-substrate 201 in the direction perpendicular to the thickness of the display panel 400 and perpendicular to the extension direction of the first joint seam 102.

[0052] Accordingly, please refer to Fig.10 The present invention also provides a method for preparing a display panel 400, comprising: S1: providing a plurality of first sub-substrates 101, each of which has a plurality of light-emitting elements 300, and splicing the plurality of first sub-substrates 101 into a first substrate 100, wherein a first splicing seam 102 exists between adjacent first sub-substrates 101; S2: providing a plurality of second sub-substrates 201, and splicing the plurality of second sub-substrates 201 into a second substrate 200, wherein a second splicing seam 202 exists between adjacent second sub-substrates 201; S3: the second substrate 200 is covered on the first substrate 100, and along the thickness direction of the display panel 400, the first splicing seam 102 and the second splicing seam 202 do not overlap, and the second splicing seam 202 includes at least one light-emitting element 300 between the orthographic projection of the first substrate 100 and the first splicing seam 102.

[0053] Second embodiment

[0054] The difference between this embodiment and the first embodiment is that it further includes an auxiliary support column 302 and a main support column 303 .

[0055] In this embodiment, please refer to Figure 6 , further comprising an auxiliary support column 302 located between the first substrate 100 and the second substrate 200 , and a gap exists between the bottom surface of the auxiliary support column 302 and the surface of the first sub-substrate 101 .

[0056] In this embodiment, the auxiliary support column 302 is formed on the second sub-substrate 201, and there is a gap between the bottom surface of the auxiliary support column 302 and the surface of the first sub-substrate 101. The advantage of this design is that when the first splicing seam 102 is squeezed, the existence of the gap can provide a buffer space to avoid the risk of disconnection or cracking of the first splicing seam 102 when it is subjected to external force. At the same time, when under pressure, the auxiliary support column 302 can play a supporting role to avoid the problem of breakage at the first splicing seam 102.

[0057] In this embodiment, the auxiliary support column 302 overlaps with the first splicing seam 102. Specifically, along the thickness direction of the vertical display panel 400 and parallel to the extension direction of the first splicing seam 102, the auxiliary support column 302 covers the first splicing seam 102, thereby effectively avoiding uneven force on the first splicing seam 102 causing abnormal display panel 400 and abnormal pressing of the first splicing seam 102, thereby ensuring the quality of the display panel 400.

[0058] In this embodiment, please continue to refer to Figure 6 , further comprising: a main support column 303 located between the first substrate 100 and the second substrate 200 , wherein the height of the main support column 303 is greater than the height of the auxiliary support column 302 .

[0059] In this embodiment, the main support column 303 is located at a non-joint position.

[0060] In some embodiments, the main support column 303 is also located at the joint.

[0061] In this embodiment, the main support column 303 can support the first substrate 100 and the second substrate 200 to prevent the first substrate 100 and the second substrate 200 from being damaged during long-term use, thereby ensuring the flatness and stability of the display panel 400; in addition, the main support column 303 is evenly distributed between the first substrate 100 and the second substrate 200, which can improve the thickness uniformity of the display panel 400 and reduce display quality problems caused by uneven thickness; at the same time, the main support column 303 not only supports the first substrate 100 and the second substrate 200, but also prevents liquid crystal from leaking inside the display panel 400, thereby ensuring the long-term stable operation of the display panel 400.

[0062] In this embodiment, the main support column 303 first bears the pressure and plays a supporting role. When the pressure further increases, the gap between the auxiliary support column 302 and the first substrate 100 becomes smaller under pressure, so that the auxiliary support column 302 is in contact with the first substrate 100, thereby providing auxiliary support.

[0063] In this embodiment, the main support pillars 303 and the auxiliary support pillars 302 are both located on the second sub-substrate 201 and can be manufactured using a mask process.

[0064] In some embodiments, please refer to Figure 7 Along the thickness direction of the display panel 400 , auxiliary support columns 302 are provided on both sides of the first joint seam 102 .

[0065] In this embodiment, along the thickness direction of the display panel 400 , the auxiliary support columns 302 are symmetrically distributed on both sides of the first joint seam 102 to ensure that the first joint seam 102 is subjected to uniform force.

[0066] In some embodiments, the main support column 303 overlaps with the first splicing seam 102. Specifically, along the thickness direction of the vertical display panel 400 and parallel to the extension direction of the first splicing seam 102, the main support covers the first splicing seam 102 or along the thickness direction of the display panel 400, the first splicing seam 102 has main support columns 303 on both sides.

[0067] Third embodiment

[0068] The difference between this embodiment and the first embodiment is that the second sub-substrate 201 is different.

[0069] In this embodiment, please refer to Figure 8 The second sub-substrate 201 has a plurality of quantum dot film layers 203 on the surface facing the first sub-substrate 101 , and the plurality of quantum dot film layers 203 correspond one-to-one to the light-emitting elements 300 .

[0070] In this embodiment, the method for forming the second substrate 200 includes: cleaning and drying the glass substrate or the PET film; uniformly depositing parylene on the surface of the substrate by vacuum vapor deposition, with a deposition thickness of about 2 to 100 μm; the quantum dot array arrangement requires that the quantum dots are sequentially coated on the substrate and then cured; depositing the parylene film layer again by vacuum vapor deposition; and peeling the quantum dot film layer 203 off the glass substrate or the PET film to form a finished quantum dot film layer 203.

[0071] Fourth embodiment

[0072] The difference between this embodiment and the first embodiment is that the second sub-substrate 201 is different.

[0073] In this embodiment, please refer to Fig. 9 The second sub-substrate 201 has a plurality of lenses 204 on the surface facing the first sub-substrate 101 , and the lenses 204 correspond to the light emitting elements 300 one by one.

[0074] Accordingly, please refer to Fig.11 The embodiment of the present invention further provides a display device 500, comprising Figures 1 to 9 Any of the display panels 400 shown. The specific structure and principle of the display panel 400 are the same as those in the above embodiment, and will not be repeated here. The display device can be any electronic device with a display function, such as a touch screen, a mobile phone, a tablet computer, a laptop computer, an e-book or a television.

[0075] Accordingly, please refer to Fig.12 , multiple display panels 400 are spliced ​​together to form a display panel of required specifications.

[0076] Fig.12 Only the splicing between two display panels 400 is shown.

[0077] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A display panel, characterized in that: include: A first substrate includes a plurality of first sub-substrates, and a first joint seam exists between adjacent first sub-substrates; a second substrate located on one side of the first substrate includes a plurality of second sub-substrates, and a light-emitting element is provided between the first substrate and the second substrate, and a second joint seam exists between adjacent second sub-substrates, and along the thickness direction of the display panel, the first joint seam and the second joint seam do not overlap; and the second joint seam includes at least one of the light-emitting elements between the orthographic projection of the first substrate and the first joint seam.

2. The display panel according to claim 1, wherein: A first light shielding layer is provided on the surface of the first sub-substrate facing the second sub-substrate, and along the thickness direction of the display panel, the second joint seam overlaps the first light shielding layer.

3. The display panel according to claim 1, wherein: A second light shielding layer is provided on the surface of the second sub-substrate facing the first sub-substrate, and along the thickness direction of the display panel, the first joint seam overlaps with the second light shielding layer.

4. The display panel according to claim 1, wherein: The second joint seam includes at least one light-emitting unit between the orthographic projection of the second joint seam on the first substrate and the first joint seam, and the light-emitting unit includes at least two light-emitting elements of different colors.

5. The display panel according to claim 1, wherein: A dimension of the first sub-substrate in a direction perpendicular to the thickness of the display panel and perpendicular to an extension direction of the first joint seam is greater than a dimension of the second sub-substrate in a direction perpendicular to the thickness of the display panel and perpendicular to an extension direction of the first joint seam.

6. The display panel according to claim 1, wherein: A dimension of the first sub-substrate in a direction perpendicular to the thickness of the display panel and perpendicular to an extension direction of the first joint seam is smaller than a dimension of the second sub-substrate in a direction perpendicular to the thickness of the display panel and perpendicular to an extension direction of the first joint seam.

7. The display panel according to claim 1, wherein: It also includes an auxiliary support column located between the first substrate and the second substrate, and there is a gap between the bottom surface of the auxiliary support column and the surface of the first sub-substrate.

8. The display panel according to claim 7, wherein: The auxiliary support column overlaps with the first joint seam.

9. The display panel according to claim 8, wherein: The auxiliary support covers the first joint seam along an extension direction perpendicular to the thickness direction of the display panel and parallel to the first joint seam.

10. The display panel according to claim 7, wherein: Along the thickness direction of the display panel, the auxiliary support columns are provided on both sides of the first joint.

11. The display panel according to claim 7, wherein: Also includes: A main supporting column is located between the first substrate and the second substrate, and the height of the main supporting column is greater than the height of the auxiliary supporting column.

12. The display panel according to claim 11, wherein: The main support column overlaps with the first joint seam.

13. The display panel according to claim 12, wherein: Along a direction perpendicular to the thickness direction of the display panel and parallel to an extension direction of the first joint seam, the main support covers the first joint seam.

14. The display panel according to claim 11, wherein: Along the thickness direction of the display panel, the main supporting columns are provided on both sides of the first joint.

15. The display panel according to claim 1, wherein: The second sub-substrate has a plurality of color resists on a surface facing the first sub-substrate, and the color resists correspond to the light-emitting elements one by one.

16. The display panel according to claim 1, wherein: The second sub-substrate has a plurality of quantum dot film layers on a surface facing the first sub-substrate, and the plurality of quantum dot film layers correspond one-to-one to the light-emitting elements.

17. The display panel according to claim 1, wherein: The second sub-substrate has a plurality of lenses on a surface facing the first sub-substrate, and the lenses correspond to the light-emitting elements one by one.

18. A method for preparing a display panel, characterized in that: include: Providing a plurality of first sub-substrates, each of which has a plurality of light-emitting elements, splicing the plurality of first sub-substrates into a first substrate, with a first splicing seam existing between adjacent first sub-substrates; Providing a plurality of second sub-substrates, splicing the plurality of second sub-substrates into a second substrate, and having a second splicing seam between adjacent second sub-substrates; The second substrate covers the first substrate, and along the thickness direction of the display panel, the first joint seam and the second joint seam do not overlap; the second joint seam includes at least one of the light-emitting elements between the orthographic projection of the first substrate and the first joint seam.

19. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 17.

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