Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel and a preparation method thereof, and a display device. The display panel comprises a driving substrate; the light-emitting elements and the auxiliary structures are located on one side of the driving substrate; the light-emitting element is electrically connected with the driving substrate; a hollow structure is arranged in the auxiliary structure, and the hollow structure surrounds at least partial area of the light-emitting element; the hollow structure comprises a first opening and a second opening, and the second opening is located on the side, away from the driving substrate, of the first opening; in the thickness direction of the display panel, at least part of the edge of the second opening is overlapped with the first opening; and at least part of the first shading structure is located in the hollow structure. By adopting the technical means, the hollow structure is arranged to surround at least part of the area of the light-emitting element, and the second opening is overlapped with the first opening, so that when the hollow structure is filled with the first shading structure, the first shading structure does not climb on the surface of the light-emitting element, and the light-emitting efficiency of the light-emitting element can be further ensured; and the display effect of the display panel can be ensured.

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 development of display technology, display products are showing a diversified development trend. Micro-light-emitting elements are increasingly used in display products due to their advantages of high brightness, high contrast and high reliability.

[0003] At present, in order to reduce the reflection of light by light-emitting elements and metal wiring, a shading structure is generally used for shielding. However, during the preparation process of the shading structure, the shading structure usually climbs on the surface or side wall of the light-emitting element. It is difficult to remove the shading structure on the surface of the light-emitting element subsequently. Even if it is removed, it will cause damage to the light-emitting element. The shading structure remaining on the surface of the light-emitting element will absorb the light emitted by the light-emitting element, thereby affecting the light output efficiency of the light-emitting element and the display effect of the display panel. Summary of the invention

[0004] In view of this, the present invention provides a display panel and a preparation method thereof, and a display device to solve the problem of the first shading structure climbing on the surface of the light-emitting element, which is beneficial to ensure the light extraction efficiency of the light-emitting element and further ensure the display effect of the display panel.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0006] Driver substrate;

[0007] A plurality of light-emitting elements and auxiliary structures are located on one side of the driving substrate; the light-emitting elements are electrically connected to the driving substrate; a hollow structure is provided in the auxiliary structure, and the hollow structure surrounds at least a part of the area of ​​the light-emitting elements; the hollow structure includes a first opening and a second opening, and the second opening is located on a side of the first opening away from the driving substrate; along the thickness direction of the display panel, at least a part of the edge of the second opening overlaps with the first opening;

[0008] At least a portion of the first light-shielding structure is located in the hollow structure.

[0009] In a second aspect, an embodiment of the present invention provides a method for manufacturing a display panel, comprising:

[0010] Providing a drive substrate;

[0011] Transferring a plurality of light emitting elements to one side of the driving substrate; the light emitting elements are electrically connected to the driving substrate;

[0012] An auxiliary structure is prepared on one side of the driving substrate; a hollow structure is provided in the auxiliary structure, the hollow structure surrounds at least a part of the light emitting element, and the hollow structure includes a first opening and a second opening, the second opening is located on a side of the first opening away from the driving substrate; along the thickness direction of the display panel, at least a part of the edge of the second opening overlaps with the first opening;

[0013] At least a portion of the first light shielding structure is filled into the hollow structure.

[0014] In a third aspect, an embodiment of the present invention provides a display device, comprising the display panel described in the first aspect of the embodiment of the present invention.

[0015] According to the technical solution provided by the embodiment of the present invention, after the light-emitting element is transferred to the driving substrate, an auxiliary structure is set, and the auxiliary structure includes a hollow structure, and the hollow structure surrounds at least a partial area of ​​the light-emitting element. When preparing the first shading structure, more first shading structures are accommodated in the hollow structure, so that the first shading structure will not directly contact the light-emitting element, but the first shading structure will fill the hollow structure through the second opening and the first opening, and then the first shading structure will not climb on the surface of the light-emitting element, that is, the first shading structure will not cover the light-emitting surface of the light-emitting element, so as to prevent the light emitted by the light-emitting element from being absorbed by the first shading structure, thereby improving the light-emitting effect of the light-emitting element and improving the display performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a first display panel provided by an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the first cross-sectional structure along the section line A-A';

[0018] Figure 3 for Figure 1 A schematic diagram of the second cross-sectional structure along the section line A-A';

[0019] Figure 4 for Figure 1 A schematic diagram of the third cross-sectional structure along the section line A-A';

[0020] Figure 5 for Figure 1 A schematic diagram of the fourth cross-sectional structure along the section line A-A';

[0021] Figure 6 for Figure 1 A schematic diagram of the fifth cross-sectional structure along the section line A-A';

[0022] Figure 7A schematic flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0023] Figure 8 for Figure 7 A corresponding process flow chart of the first display panel manufacturing method;

[0024] Fig. 9 for Figure 7 A corresponding process flow chart of the second display panel manufacturing method;

[0025] Fig.10 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] In the related art, the preparation process of the first light-shielding structure is generally after the light-emitting element is transferred to the driving substrate. Specifically, the light-emitting element is first transferred to the driving substrate, and then the first light-shielding structure is prepared on the surface of the driving substrate facing the light-emitting element to achieve shielding of the metal wiring. However, the inventors have found that in the related art, in the process of preparing the first light-shielding structure, the first light-shielding structure is easy to climb on the surface of the light-emitting element, and then cover the light-emitting surface of the light-emitting element. In this way, part of the light emitted by the light-emitting element will be absorbed by the first light-shielding structure, which will affect the light-emitting efficiency of the light-emitting element, resulting in a decrease in display brightness and affecting the display effect of the display panel.

[0028] Based on the defects of the above-mentioned related technologies, the present application provides a display panel, including: a driving substrate; a plurality of light-emitting elements and an auxiliary structure located on one side of the driving substrate; the light-emitting elements are electrically connected to the driving substrate; a hollow structure is provided in the auxiliary structure, and the hollow structure surrounds at least a part of the area of ​​the light-emitting element; the hollow structure includes a first opening and a second opening, and the second opening is located on a side of the first opening away from the driving substrate; along the thickness direction of the display panel, the second opening overlaps with the first opening; at least a part of the first shading structure is located in the hollow structure.

[0029] Through the above technical solution, after the light-emitting element is transferred to the driving substrate, an auxiliary structure is set, and the auxiliary structure includes a hollow structure, and the hollow structure surrounds at least a part of the area of ​​the light-emitting element. In this way, when preparing the first shading structure, the first light-shielding structure will be accommodated by the hollow structure and will not directly contact the light-emitting element. Instead, the hollow structure will be filled through the second opening and the first opening, and then the first light-shielding structure will not climb on the surface of the light-emitting element, that is, the first light-shielding structure will not cover the light-emitting surface of the light-emitting element, so as to prevent the light emitted by the light-emitting element from being absorbed by the first light-shielding structure, thereby improving the light-emitting effect of the light-emitting element and improving the display performance of the display panel.

[0030] The above is the core idea of ​​the present invention. The technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Figure 1 A schematic diagram of the structure of a first display panel provided by an embodiment of the present invention, Figure 2 for Figure 1 The first cross-sectional structure schematic diagram along the cross-sectional line A-A' is as follows: Figure 1 and Figure 2 As shown, the display panel includes: a driving substrate 10; a plurality of light-emitting elements 20 and an auxiliary structure 30 located on one side of the driving substrate 10; the light-emitting element 20 is electrically connected to the driving substrate 10; a hollow structure 301 is provided in the auxiliary structure 30, and the hollow structure 301 surrounds at least a part of the area of ​​the light-emitting element 20; the hollow structure 301 includes a first opening 3011 and a second opening 3012, and the second opening 3012 is located on a side of the first opening 3011 away from the driving substrate 10; along the thickness direction of the display panel (such as Figure 2 ), at least a portion of the edge of the second opening 3012 overlaps with the first opening 3011 ; at least a portion of the first light shielding structure 40 is located in the hollow structure 301 .

[0032] Specifically, the driving substrate 10 may include a base substrate 101 and a driving layer 102 disposed on one side of the base substrate 101. The base substrate 101 may be a rigid substrate or a flexible substrate, which is not limited in the embodiment of the present invention. The specific structure of the driving layer may be set according to actual needs. For example, when the driving mode of the light-emitting element 20 is active driving, the driving layer 102 may include a driving circuit and a bonding structure 103; when the driving mode of the light-emitting element 20 is passive driving, the driving layer 102 may include a bonding structure 103. The present invention does not limit the setting mode of the driving layer.

[0033] Exemplarily, the driving layer 102 may include a pixel circuit, which is used to receive a scanning signal and turn on or off under the action of the scanning signal to provide the light-emitting signal provided by the light-emitting signal line to the light-emitting element, or stop providing the light-emitting signal to the light-emitting element; the light-emitting signal line may include a data signal line and a positive power signal line, and the corresponding light-emitting signal may include a data signal and a positive power signal. The pixel circuit may include a transistor. Taking the top-gate thin film transistor 1021 as an example, the thin film transistor layer 1021 includes an active layer 10211, a gate 10213, a source 10215 and a drain 10216 located on the substrate 101. The gate 10213 is placed in the channel region corresponding to the active layer 10211, the source 10215 is electrically connected to the source region in the active layer 10211, and the drain 10216 is electrically connected to the drain region in the active layer 10211. Under the action of the gate signal, the channel region is turned on and converted from a non-conductor state to a conductor state, and a path is formed between the corresponding source 10215 and the drain 10216 to achieve normal operation of the transistor. Further, the active layer 10211 may be an amorphous silicon material, a polycrystalline silicon material or a metal oxide material, etc. The thin film transistor layer 1021 further includes a gate insulating layer 10212 located between the active layer 10211 and the gate 10213, and an interlayer insulating layer 10214 located on the gate 10213. The gate insulating layer 10212 includes an inorganic layer such as silicon oxide or silicon nitride, and may include a single layer or multiple layers. The interlayer insulating layer 10214 may be formed of an inorganic layer insulating layer such as silicon oxide or silicon nitride, or may also be formed of an organic insulating material.

[0034] Specifically, the light emitting element 20 may be a micro light emitting element such as a micro light emitting diode (Micro Light Emitting Diode, MicroLED) or a sub-millimeter light emitting diode (Mini Light Emitting Diode, Mini LED). The light emitting element 20 is arranged on one side of the driving substrate 10, and the light emitting element 20 includes a light emitting element body 201 and an electrode structure 202. The light emitting element body 201 may refer to a micro light emitting diode chip, which is used for emitting light, and the electrode structure 202 is electrically connected to the bonding structure 103 on the driving substrate. For micro light emitting diode chips with different structures, the relative positions of the light emitting element body 201 and the electrode structure 202 may be different. In the drawings of the embodiments of the present invention, a flip chip is taken as an example, and the light emitting element body 201 may be located on the side of the electrode structure 202 away from the driving substrate 10, but it is not limited thereto.

[0035] Specifically, after the light-emitting element 20 is transferred to the driving substrate 10, a whole layer of auxiliary layer is prepared on one side of the driving substrate, and then the auxiliary layer is patterned by an etching process to form a hollow structure 301 inside the auxiliary layer, that is, the preparation of the auxiliary structure 30 is completed. Further, the hollow structure 301 includes a first opening 3011 and a second opening 3012, and the second opening 3012 is located on the side of the first opening 3011 away from the driving substrate 10. The bonding structure 103 on the driving substrate 10 can be exposed through the first opening 3011, so that the bonding structure 103 and other metals can be shielded by the first shading structure 40 later, so as to achieve a better shading effect. In the case of the first shading structure 40, more first shading structures 40 are accommodated in the hollow structure 301, and the first shading structure 40 can cover the bonding structure 103 and the electrode structure 202. Along the thickness direction Z of the display panel, at least part of the edge of the second opening 3012 overlaps with the first opening 3011, that is, the projection of at least part of the edge of the second opening 3012 falls within the projection of the first opening 3011, that is, the first opening 3011 and the second opening 3012 may be connected, so that the first light shielding structure 40 enters the first opening 3011 through the second opening 3012 to fill the hollow structure 301. Exemplarily, the projection of the first opening 3011 may completely cover the projection of the second opening 3012, that is, the projection of the edge of the second opening 3012 falls into the first opening 3011, so that the first light shielding structure 40 enters the first opening 3011 through the second opening 3012 to fill the hollow structure 301.

[0036] Specifically, when preparing the first light-shielding structure 40, the first light-shielding structure 40 sequentially fills the hollow structure 301 through the second opening 3012 and the first opening 3011, and then the first light-shielding structure 40 is used to shield the metal wiring and the electrode structure 202, thereby avoiding the metal reflection problem and improving the display performance of the display panel. In addition, the first light-shielding structure 40 sequentially fills the hollow structure 301 through the second opening 3012 and the first opening 3011, and the first light-shielding structure 40 will not directly contact the surface of the light-emitting element 20, and then the first light-shielding structure 40 will not climb on the surface of the light-emitting element. In other words, the first light-shielding structure 40 will not cover the surface of the light-emitting element, preventing the light emitted by the light-emitting element 20 from being absorbed by the first light-shielding structure 40, which is conducive to ensuring the light extraction efficiency of the light-emitting element, and then ensuring the display brightness of the display panel.

[0037] It is understandable that the first light shielding structure 40 may not completely fill the first opening 3011 and the second opening 3012. Exemplarily, the first light shielding structure 40 may fill part of the first opening 3011, or completely fill the first opening 3011, or completely fill the first opening 3011 and partially fill the second opening 3012, or completely fill the first opening 3011 and the second opening 3012. When preparing the first light shielding structure 40, more first light shielding structures 40 are accommodated in the hollow structure 301, so that the first light shielding structure 40 will not directly contact the light emitting element 20 but will fill the hollow structure 301 through the second opening 3012 and the first opening 3011, and then the first light shielding structure 40 will not climb on the surface of the light emitting element 20, thereby improving the display performance of the display panel.

[0038] Figure 3 for Figure 1 The second cross-sectional structure schematic diagram along the section line A-A' is as follows: Figure 3 As shown, in order to improve the light output efficiency of the light emitting element 20, the surface of the light emitting element 20 can be subjected to microstructuring or roughening treatment. The light output angle of the light emitting element body 201 can be adjusted by microstructuring or roughening treatment to avoid total internal reflection of the output light of the light emitting element body 201 at the top light output surface, thereby improving the light output efficiency of the light emitting element body 201.

[0039] The display panel provided by the embodiment of the present invention is provided with an auxiliary structure after the light-emitting element is transferred to the driving substrate, and the auxiliary structure includes a hollow structure, and the hollow structure surrounds at least a partial area of ​​the light-emitting element. In this way, when preparing the first shading structure, more first shading structures are accommodated in the hollow structure. In this way, the first shading structure will not directly contact the light-emitting element, but the first shading structure will fill the hollow structure through the second opening and the first opening, and thus the first shading structure will not climb on the surface of the light-emitting element, that is, the first shading structure will not cover the light-emitting surface of the light-emitting element, so as to prevent the light emitted by the light-emitting element from being absorbed by the first shading structure, thereby improving the light-emitting effect of the light-emitting element and improving the display performance of the display panel.

[0040] Optional, continue to refer to Figure 2 , the opening area of ​​the second opening 3012 is smaller than the opening area of ​​the first opening 3011 .

[0041] Specifically, the opening area of ​​the first opening 3011 can be understood as the area along the first direction (eg Figure 2 The opening size of the first opening 3011 along the X direction (as shown in FIG. 1 ) is different from the opening size along the second direction (as shown in FIG. 1 ). Figure 2The opening area of ​​the second opening 3012 can be understood as the product of the opening size of the second opening 3012 along the first direction X and the opening size of the second opening 3012 along the second direction Y.

[0042] Specifically, the opening area of ​​the second opening 3012 is smaller than the opening area of ​​the first opening 3011, that is, the opening area of ​​the first opening 3011 is larger and can accommodate more first shading structures 40, and the opening area of ​​the first opening 3011 is smaller and can accommodate fewer first shading structures 40. This is beneficial for fully exposing the bonding structure 103 through the first opening 3011, so that the first shading structure 40 in the first opening 3011 can block the bonding structure 103 and other metals, thereby reducing metal reflections. On the other hand, since the second opening 3012 is closer to the side light-emitting surface of the light-emitting element 20, more first shading structures 40 are arranged in the first opening 3011, and only a small part of the first shading structure 40 fills the second opening 3012, thereby preventing the first shading structure 40 from climbing on the surface of the light-emitting element 20, which is beneficial for ensuring the light-emitting effect of the light-emitting element.

[0043] Optional, continue to refer to Figure 2 The auxiliary structure 30 includes a single film layer auxiliary structure 30-1, that is, the auxiliary structure 30 is a single-layer arrangement rather than a multi-layer structure. This can ensure that the preparation process of the auxiliary structure 30 is simple on the one hand, and on the other hand, it is conducive to ensuring that the film layer of the auxiliary structure 30 is relatively thin, thereby achieving a thin setting for the display panel.

[0044] Optional, continue to refer to Figure 2 , the single film layer auxiliary structure 30 - 1 includes a negative photoresist layer.

[0045] Specifically, the single film layer auxiliary structure 30-1 includes a negative photoresist layer. A mask is first used to cover the position where an opening is to be formed in the negative photoresist layer. In this way, when the negative photoresist layer is exposed, the position not covered by the mask is modified and insoluble in the developer, while the area covered by the mask is not modified and can be dissolved in the developer to form an opening. Since the position close to the lower surface of the negative photoresist layer is far from the exposure source and the exposure amount is small, the area where the modification occurs is small, and thus the area where the opening is insoluble in the developer is small, and the area where the opening is dissolved in the developer is large. In this way, a hollow structure 301 with a small upper opening and a large lower opening can be formed in the single film layer auxiliary structure 30-1.

[0046] It is understandable that, due to process limitations, when the auxiliary structure 30 includes a single-layer auxiliary structure 30 - 1 , the boundary between the second opening 3012 and the first opening 3011 formed in the single-layer auxiliary structure 30 - 1 is not obvious.

[0047] Specifically, the single film layer auxiliary structure 30 - 1 uses a negative photoresist layer, so that the first opening 3011 and the second opening 3012 can be prepared by the same process steps, the preparation method is simple, and the shape of the hollow structure 301 is controllable.

[0048] Optional, Figure 4 for Figure 1 The third cross-sectional structure schematic diagram along the cross-sectional line A-A' is as follows: Figure 4 As shown, the auxiliary structure 30 includes at least two auxiliary layers 30 - 2, and the at least two auxiliary layers 30 - 2 include a first auxiliary layer 31 and a second auxiliary layer 32; the first auxiliary layer 31 is located on the side of the second auxiliary layer 32 close to the drive substrate 10; the first opening 3011 is located in the first auxiliary layer 31, and the second opening 3012 is located in the second auxiliary layer 32.

[0049] Specifically, the auxiliary structure 30 includes at least two auxiliary layers 30-2. Taking the two auxiliary layers 30-2 as an example, after the light-emitting element 20 is transferred to the driving substrate 10, the first auxiliary layer 31 and the second auxiliary layer 32 are prepared in sequence on one side of the driving substrate 10, and then the second auxiliary layer 32 is patterned to form a second opening 3012, the second opening 3012 exposes a portion of the first auxiliary layer 31, and then the first auxiliary layer 31 is patterned through the second opening 3012 to form a first opening 3011, and then the first opening 3011 is connected to the second opening 3012 to form a hollow structure 301, so that diversified settings of the auxiliary structure 30 and the hollow structure 301 can be achieved.

[0050] Specifically, when preparing the first light-shielding structure 40, more first light-shielding structures 40 are accommodated in the hollow structure 301. The first light-shielding structure 40 can cover the bonding structure 103 and the electrode structure 202, thereby shading the bonding structure 103 and the electrode structure 202, avoiding metal reflections, and improving the performance of the display panel.

[0051] Optional, continue to refer to Figure 4 The material of the first auxiliary layer 31 includes a non-photoresistive material soluble in a developer, and the material of the second auxiliary layer 32 includes a photoresistive material.

[0052] Specifically, taking the case where the material of the second auxiliary layer 32 includes a positive photoresist material as an example, when the second auxiliary layer 32 is exposed, the exposed position is prone to photochemical decomposition due to absorption of energy during the exposure process, and then the exposed position is easily dissolved in the developer, forming a second opening 3012, and the second opening 3012 exposes part of the first auxiliary layer 31. Since the material of the first auxiliary layer 31 is non-photoresist, when the second auxiliary layer 32 is exposed, photochemical decomposition will not occur in the first auxiliary layer 31, but since the material of the first auxiliary layer 31 is soluble in the developer, the first auxiliary layer 31 is dissolved by the developer through the second opening 3012 to form the first opening 3011, so that the first opening 3011 and the second opening 3012 are connected to form the hollow structure 301, and then the hollow structure can be diversified. Exemplarily, the material of the second auxiliary layer 32 can be a photosensitive resin, and the material of the first auxiliary layer 31 can be a glue material that is not photosensitive and easily soluble in the developer.

[0053] It should be noted that the opening area of ​​the first opening 3011 can be controlled by controlling the development time. Specifically, if the reaction time between the developer and the first auxiliary layer 31 is long, the opening area of ​​the first opening 3011 is large, and if the reaction time between the developer and the first auxiliary layer 31 is short, the opening area of ​​the first opening 3011 is small.

[0054] It should be noted that Figure 4 Only the technical solution in which the auxiliary structure 30 includes two auxiliary layers 30-2 is shown. It can be understood that the auxiliary structure 30 can also include three or even more auxiliary layers 30-2, so as to form a hollow structure 301 with a greater depth within the multiple auxiliary layers 30-2, and then more first shading structures 40 can be accommodated in the hollow structure 301, thereby improving the shading effect on the metal wiring and further improving the performance of the display panel.

[0055] Optional, continue to refer to Figure 4 , the thickness of the first auxiliary layer 31 is greater than the thickness of the second auxiliary layer 32 .

[0056] Specifically, the greater the thickness of the first auxiliary layer 31, the greater the depth of the first opening 3011 in the first auxiliary layer 31 along the thickness direction Z of the display panel, and thus a thicker first light shielding structure 40 can be filled in the first opening 3011. In other words, more first light shielding structures 40 can be accommodated in the hollow structure 301, and the more first light shielding structures 40 there are, the better the light shielding effect is. Therefore, by setting the thickness of the first auxiliary layer 31 to be greater than the thickness of the second auxiliary layer 32, the light shielding effect of the first light shielding structure 40 on the metal wiring and the electrode structure 202 can be further guaranteed, and the performance of the display panel can be further improved.

[0057] Exemplarily, the thickness of the first auxiliary layer 31 is greater than or equal to 1 μm, and the thickness of the second auxiliary layer 32 is greater than or equal to 1 μm. On the one hand, this can match the preparation process of the auxiliary layer, and on the other hand, it can ensure that the hollow structure 301 formed in the auxiliary layer of this thickness can accommodate the first shading structure 40 with a normal shading effect.

[0058] Optional, Figure 5 for Figure 1 The fourth cross-sectional structure schematic diagram along the cross-sectional line A-A' is as follows: Figure 5 As shown, the hollow structure 301 surrounding the same light emitting element 20 includes at least one first opening 3011 and a plurality of second openings 3012 .

[0059] Specifically, the second opening 3012 surrounding the same light emitting element 20 may be multiple circles, which is conducive to preparing the first opening 3011 through the second opening 3012. Taking the auxiliary structure 30 including two auxiliary layers 30-2 as an example, after the second auxiliary layer 32 is patterned to form a plurality of second openings 3012, the developer can pattern the first auxiliary layer 31 through the plurality of second openings 3012, which can improve the preparation efficiency of the first opening 3011.

[0060] It can be understood that when the auxiliary structure is a single film layer auxiliary structure and the material is a negative photoresist, the hollow structure may also include at least one first opening 3011 and a plurality of second openings 3012 .

[0061] For example, the opening areas of the plurality of second openings 3012 may be equal or unequal, which is not limited in the embodiment of the present invention. For example, the projections of the plurality of second openings 3012 may overlap with the projection of one first opening 3011, that is, the plurality of second openings 3012 may correspond to one first opening 3011.

[0062] Optional, Figure 6 for Figure 1 The fifth cross-sectional structure schematic diagram along the section line A-A' is as follows: Figure 6 As shown, along the first direction (such as Figure 6 The first direction X intersects with the thickness direction Z of the display panel.

[0063] Specifically, the opening area of ​​the second opening section 3012-2 is larger than the opening area of ​​the first opening section 3012-1, so that the second opening section 3012-2 can accommodate more first light-shielding structures 40. When preparing the first light-shielding structure 40, when the flowing light-shielding material flows from the side away from the light-emitting element 20 to the side close to the light-emitting element 20, since the second opening section 3012-2 can accommodate more first light-shielding structures 40, the first light-shielding structures 40 can be prevented from overflowing in the second opening section 3012-2, and the first light-shielding structures 40 can be further prevented from climbing on the surface of the light-emitting element, thereby further improving the display performance of the display panel.

[0064] Illustratively, along the first direction X, the distance between two adjacent second openings 3012 may be equal or unequal, which is not limited in the embodiment of the present invention.

[0065] Optionally, referring to Figure 6 , along the direction from the first opening section 3012 - 1 to the second opening section 3012 - 2 , the opening areas of the plurality of second openings 3012 increase sequentially.

[0066] Specifically, along the direction from the first opening section 3012-1 to the second opening section 3012-2, the opening areas of the plurality of second openings 3012 gradually change, and the closer to the position of the light-emitting element 20, the larger the opening area of ​​the second opening 3012, that is, the second opening 3012 that is closer to the position of the light-emitting element 20 can accommodate more first shading structures 40. In this way, when preparing the first shading structure 40, the first shading structure 40 in the second opening 3012 that is closer to the position of the light-emitting element 20 is less likely to overflow, thereby preventing the first shading structure 40 from climbing on the surface of the light-emitting element, that is, the first shading structure 40 will not cover the surface of the light-emitting element 20, and will not affect the light output efficiency of the light-emitting element, which is beneficial to ensuring the display effect of the display panel.

[0067] Optional, continue to refer to Figure 2 The display panel further includes a second light shielding structure 50 ; the second light shielding structure 50 covers the surface of the auxiliary structure away from the driving substrate 10 , and the second light shielding structure 50 is connected to the first light shielding structure 40 .

[0068] Specifically, along the first direction X, since the opening size of the first opening 3011 and the opening size of the second opening 3012 cannot be infinitely large, the position in the auxiliary structure 30 that is not filled with the first shading structure 40 cannot shield the metal wiring. By setting the second shading structure 50, the second shading structure 50 can block the metal wiring corresponding to the position that is not filled with the first shading structure 40, thereby reducing the reflection of the metal wiring and further improving the performance of the display panel.

[0069] It should be noted that when preparing the first light-shielding structure 40, the light-shielding material can be released from the edge position away from the light-emitting element 20, so that the light-shielding material gradually flows to the first opening 3011 through the side wall of the second opening 3012, and fills the hollow structure 301 to form the first light-shielding structure 40. The light-shielding material that does not enter the hollow structure 301 can be retained on the upper surface of the auxiliary structure 30 to form the second light-shielding structure 50. In this way, the first light-shielding structure 40 and the second light-shielding structure 50 are prepared in the same process step, and the preparation process is simple. The first light-shielding structure 40 and the second light-shielding structure 50 are connected and arranged, which can increase the light-shielding area and further improve the display effect of the display panel.

[0070] Optional, continue to refer to Figure 2 Along the first direction X, a distance D1 between the second opening 3012 and the light emitting element 20 satisfies: D1>1 μm; the first direction X intersects with a thickness direction Z of the display panel.

[0071] Specifically, when D1<1μm, it means that the distance between the second opening 3012 and the light emitting element 20 is small. In this way, when preparing the first light shielding structure 40, the first light shielding structure 40 overflowing from the second opening 3012 will climb toward the surface of the light emitting element 20, thereby affecting the light emitting effect of the light emitting element, and the display brightness of the display panel is low. In the embodiment of the present invention, D1>1μm is set, and the distance between the second opening 3012 and the light emitting element 20 is moderate. Even if the first light shielding structure 40 overflows from the second opening 3012, since there is still a certain distance between the second opening 3012 and the light emitting element 20, the overflowed first light shielding structure 40 will not climb on the surface of the light emitting element 20, and then the first light shielding structure 40 will not cover the surface of the light emitting element 20, and will not affect the light emitting effect of the light emitting element 20, and can ensure the display brightness of the display panel.

[0072] Optional, continue to refer to Figure 2 , along the first direction X, the first opening 3011 includes a first side wall a away from the light emitting element 20, and the second opening 3012 includes a second side wall b away from the light emitting element 20; the first direction X intersects with the thickness direction Z of the display panel; along the first direction X, a distance D2 between the first side wall a and the second side wall b satisfies: D2≤4μm.

[0073] Specifically, the distance D2 between the first side wall a and the second side wall b satisfies: D2≤4μm. In this way, the distance between the first side wall a and the second side wall b is moderate. On the one hand, it can ensure the feasibility of the process. On the other hand, the first shading structure 40 between the first side wall a and the second side wall b can shield the metal wiring covered by it, thereby reducing metal reflection and improving the performance of the display panel.

[0074] It should be noted that, continue to refer to Figure 4 The distance between the first side wall a and the second side wall b can be controlled by the development time, that is, by controlling the reaction time between the first auxiliary layer and the developer, the size of the first opening 3011 can be controlled.

[0075] Optional, continue to refer to Figure 2 The light-emitting element includes a light-emitting element body 201; the auxiliary structure 30 includes a first auxiliary surface a1 away from the side of the driving substrate 10, and the light-emitting element body 201 includes a first light-emitting surface a2 away from the side of the driving substrate 10; the distance D3 between the first auxiliary surface a1 and the first light-emitting surface a2 and the height D4 of the light-emitting element body 201 satisfy: D3 / D4≥1 / 4.

[0076] Specifically, when D3 / D4<1 / 4, the distance between the first auxiliary surface a1 and the first light emitting surface a2 is small, and the first light shielding structure 40 easily climbs up to the first light emitting surface a2 through the side light emitting surface of the light emitting element 20, and then the light emitted from the side light emitting surface and the first light emitting surface a2 covered by the first light shielding structure 40 will be absorbed by the first light shielding structure 40, affecting the light emitting efficiency of the light emitting element, and then affecting the display brightness of the display panel. In the embodiment of the present invention, D3 / D4≥1 / 4 is set, the first auxiliary surface a1 does not exceed the first light emitting surface a2, that is, the first auxiliary surface a1 is below the first light emitting surface a2, and the distance between the first auxiliary surface a1 and the first light emitting surface a2 is large, that is, the step difference between the first auxiliary surface a1 and the first light emitting surface a2 is large, so when the first light shielding structure 40 is prepared on the upper surface of the first auxiliary surface a1, it is not conducive to the first light shielding structure 40 climbing up the surface of the light emitting element 20, and then the first light shielding structure 40 can be prevented from covering the surface of the light emitting element, thereby improving the display effect.

[0077] Optional, continue to refer to Figure 2 The light-emitting element 20 includes a light-emitting element body 201; along the thickness direction Z of the display panel, the auxiliary structure 30 includes a first auxiliary surface a1 away from the side of the driving substrate 10, and the light-emitting element body 201 includes a first light-emitting surface a2 away from the side of the driving substrate 10 and a second light-emitting surface a3 close to the driving substrate 10; the distance between the first auxiliary surface a1 and the driving substrate 10 is smaller than the distance between the first light-emitting surface a2 and the driving substrate 10, and is larger than the distance between the second light-emitting surface a3 and the driving substrate 10.

[0078] Specifically, the distance between the first auxiliary surface a1 and the driving substrate 10 is smaller than the distance between the first light emitting surface a2 and the driving substrate 10. Thus, when preparing the first shading structure 40, the first shading structure 40 will not cover the light emitting surface of the light emitting element, which is beneficial to ensure the light emitting efficiency of the light emitting element.

[0079] Specifically, the distance between the first auxiliary surface a1 and the driving substrate 10 is greater than the distance between the second light emitting surface a3 and the driving substrate 10, which is beneficial for the first shading structure 40 to cover the electrode structure 202 and the bonding structure 103, thereby improving the shading effect on the metal and improving the performance of the display panel.

[0080] In summary, after the light-emitting element is transferred to the driving substrate, the hollow structure surrounds at least part of the area of ​​the light-emitting element. When preparing the first light-shielding structure, more first light-shielding structures are accommodated in the hollow structure, so that the first light-shielding structure will not directly contact the light-emitting element, but will fill the hollow structure through the second opening and the first opening, and then the first light-shielding structure will not climb on the surface of the light-emitting element, that is, the first light-shielding structure will not cover the light-emitting surface of the light-emitting element, preventing the light emitted by the light-emitting element from being absorbed by the first light-shielding structure, thereby improving the light-emitting effect of the light-emitting element and improving the display performance of the display panel. In addition, the auxiliary structure can be a single film layer of negative photoresist material, or the auxiliary structure can be at least two auxiliary layers, wherein the material of the upper auxiliary layer can be a photoresist material, and the material of the lower auxiliary layer can be a non-photoresistive material that is soluble in the developer, so that a diversified setting of the auxiliary structure can be achieved. In addition, a hollow structure in which the opening area of ​​the second opening is smaller than the opening area of ​​the first opening can be formed in the auxiliary structure, that is, more first shading structures can be accommodated in the first opening, and fewer first shading structures can be accommodated in the second opening. Since the second opening is closer to the side light-emitting surface of the light-emitting element, the first shading structure can be prevented from climbing on the surface of the light-emitting element, which is beneficial to ensuring the light-emitting effect of the light-emitting element.

[0081] Based on the same inventive concept, an embodiment of the present invention further provides a method for preparing a display panel. Figure 7 A schematic diagram of a method for manufacturing a display panel provided by an embodiment of the present invention is provided. Figure 8 for Figure 7 The corresponding process flow chart of the first display panel preparation method is as follows: Fig. 9 for Figure 7 The corresponding process flow chart of the second display panel preparation method is as follows: Figure 7-Figure 9 As shown, the method for preparing the display panel includes:

[0082] S101, providing a driving substrate.

[0083] Specifically, referring to steps (a1) and (a2), the driving substrate 10 may include a base substrate 101 and a driving layer disposed on one side of the base substrate 101 , and the driving layer may include a driving circuit 102 and a bonding structure 103 .

[0084] S102, transferring a plurality of light emitting elements to one side of a driving substrate; the light emitting elements are electrically connected to the driving substrate.

[0085] Specifically, referring to steps (b1) and (b2), the light emitting element 20 transfer process may be a mass transfer process. The specific transfer method may refer to the prior art, and the embodiment of the present invention does not elaborate nor limit this.

[0086] S103, preparing an auxiliary structure on one side of the driving substrate; a hollow structure is provided in the auxiliary structure, the hollow structure surrounds at least a portion of the light-emitting element, and the hollow structure includes a first opening and a second opening, the second opening is located on a side of the first opening away from the driving substrate; along the thickness direction of the display panel, at least a portion of the edge of the second opening overlaps with the first opening.

[0087] For details, please refer to Figure 8 and Fig. 9 After the light emitting element 20 is transferred to the driving substrate 10, a whole layer of auxiliary layer is prepared on one side of the driving substrate, and then the auxiliary layer is patterned by etching process to form a hollow structure 301 inside the auxiliary layer, that is, the preparation of the auxiliary structure 30 is completed. Further, the hollow structure 301 includes a first opening 3011 and a second opening 3012, and the second opening 3012 is located on the side of the first opening 3011 away from the driving substrate 10. The bonding structure 103 on the driving substrate 10 can be exposed through the first opening 3011, so that the bonding structure 103 and other metals can be shielded by the first light shielding structure 40 later, so as to achieve a better light shielding effect. Along the thickness direction Z of the display panel, at least part of the edge of the second opening 3012 overlaps with the first opening 3011, that is, the projection of at least part of the edge of the second opening 3012 falls within the projection of the first opening 3011, that is, the first opening 3011 and the second opening 3012 may be connected, so that the first light shielding structure 40 enters the first opening 3011 through the second opening 3012 to fill the hollow structure 301. Exemplarily, the projection of the first opening 3011 may completely cover the projection of the second opening 3012, that is, the projection of the edge of the second opening 3012 falls into the first opening 3011, so that the first light shielding structure 40 enters the first opening 3011 through the second opening 3012 to fill the hollow structure 301, thereby improving the filling efficiency of the first light shielding structure 40.

[0088] Specifically, the opening area of ​​the second opening 3012 is smaller than the opening area of ​​the first opening 3011, that is, the opening area of ​​the second opening 3012 is smaller, and can accommodate fewer first light shading structures 40, and the opening area of ​​the first opening 3011 is larger, and can accommodate more first light shading structures 40, so that the first light shading structures 40 in the first opening 3011 can fully block the metal wiring and reduce metal reflection. On the other hand, since the second opening 3012 is closer to the side light emitting surface of the light emitting element 20, by arranging more first light shading structures 40 in the first opening 3011, only a small part of the first light shading structure 40 fills the second opening 3012, thereby preventing the first light shading structure 40 from climbing on the surface of the light emitting element 20, which is beneficial to ensuring the light emitting effect of the light emitting element.

[0089] Specifically, refer to Figure 8 In step (c1), a single film layer auxiliary structure 30-1 is first prepared on one side of the driving substrate 10. The single film layer auxiliary structure 30-1 includes a negative photoresist layer. A mask is first used to cover the position where an opening is to be formed in the negative photoresist layer. In this way, when the negative photoresist layer is exposed, the position not covered by the mask is modified and insoluble in the developer. However, the area covered by the mask is not modified and can be dissolved in the developer to form an opening. Since the position close to the lower surface of the single film layer auxiliary structure 30-1 is far from the exposure source and the exposure amount is small, the area that is modified is small, and thus the area that is insoluble in the developer is small, and the area that is soluble in the developer is large. In this way, a hollow structure 301 with a small upper opening and a large lower opening can be formed in the single film layer auxiliary structure 30-1.

[0090] Specifically, refer to Fig. 9In step (c2), an auxiliary layer 30-2 is prepared on one side of the driving substrate 10, the auxiliary layer 30-2 is exposed, and the area of ​​the hollow structure 301 is controlled according to the development time to form an auxiliary structure 30. The auxiliary structure 30 includes two layers of auxiliary layers 30-2 as an example for explanation. After the light-emitting element 20 is transferred to the driving substrate 10, a first auxiliary layer 31 is first prepared on one side of the driving substrate 10, and then a second auxiliary layer 32 is prepared on the upper surface of the first auxiliary layer 32. The first auxiliary layer 31 and the second auxiliary layer 32 are patterned to form a second opening 3012 in the second auxiliary layer 32 and a first opening 3011 in the first auxiliary layer 31. Specifically, taking the material of the second auxiliary layer 32 including a positive photoresist material as an example, when the second auxiliary layer 32 is exposed, the exposed position is easily photochemically decomposed due to absorption of energy during the exposure process, and then the exposed position is easily dissolved in the developer to form a second opening 3012, and the second opening 3012 exposes part of the first auxiliary layer 31. Since the material of the first auxiliary layer 31 is non-photoresistive, when the second auxiliary layer 32 is exposed, no photochemical decomposition will occur in the first auxiliary layer 31. However, since the material of the first auxiliary layer 31 is soluble in the developer, the developer is used to dissolve the first auxiliary layer 31 through the second opening 3012 to form the first opening 3011, so that the first opening 3011 and the second opening 3012 are connected to form the hollow structure 301. It should be noted that the opening area of ​​the first opening 3011 is controlled by controlling the development time, that is, controlling the reaction time of the developer and the first auxiliary layer 31. It can be understood that if the reaction time of the developer and the first auxiliary layer 31 is long, the opening area of ​​the first opening 3011 is large, and if the reaction time of the developer and the first auxiliary layer 31 is short, the opening area of ​​the first opening 3011 is small.

[0091] S104, filling at least a portion of the first light shielding structure into the hollow structure.

[0092] For details, please refer to Figure 8 Step (d1) and Fig. 9 In step (d2), at least a portion of the first light shielding structure 40 is filled into the hollow structure 301 using inkjet printing technology.

[0093] Specifically, when preparing the first shading structure 40, the first shading structure 40 sequentially fills the hollow structure 301 through the second opening 3012 and the first opening 3011, and then the first shading structure 40 can achieve shielding of the metal wiring and the electrode structure 202, avoid the metal reflection problem, and improve the display performance of the display panel. In addition, the first shading structure 40 sequentially fills the hollow structure 301 through the second opening 3012 and the first opening 3011, and the first shading structure 40 will not directly contact the surface of the light-emitting element, and then the first shading structure 40 will not climb on the surface of the light-emitting element. In other words, the first shading structure 40 will not cover the surface of the light-emitting element, preventing part of the light emitted by the light-emitting element 20 from being absorbed by the first shading structure 40, which is conducive to ensuring the light extraction efficiency of the light-emitting element, and then ensuring the display brightness of the display panel.

[0094] The method for preparing a display panel provided in an embodiment of the present invention prepares an auxiliary structure on one side of a driving substrate, and the auxiliary structure includes a hollow structure, and the hollow structure surrounds at least a partial area of ​​a light-emitting element. In this way, when preparing a first light-shielding structure, a larger number of first light-shielding structures are accommodated in the hollow structure. In this way, the first light-shielding structure will not directly contact the light-emitting element, but the first light-shielding structure will fill the hollow structure through the second opening and the first opening, and thus the first light-shielding structure will not climb on the surface of the light-emitting element, that is, the first light-shielding structure will not cover the light-emitting surface of the light-emitting element, thereby preventing the light emitted by the light-emitting element from being absorbed by the first light-shielding structure, thereby improving the light-emitting effect of the light-emitting element and improving the display performance of the display panel.

[0095] Based on the same inventive concept, an embodiment of the present invention further provides a display device, Fig.10 FIG. 1 is a schematic diagram of a display device provided by an embodiment of the present invention. Fig.10 As shown, the display device includes the display panel provided by any embodiment of the present invention. Therefore, the display device provided by the embodiment of the present invention has the corresponding beneficial effects of the display panel provided by the embodiment of the present invention, which will not be repeated here. Exemplarily, the display device 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, which is not limited by the embodiment of the present invention.

[0096] 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, combinations 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: Driver substrate; A plurality of light emitting elements and auxiliary structures located on one side of the driving substrate; The light emitting element is electrically connected to the driving substrate; The auxiliary structure is provided with a hollow structure, and the hollow structure surrounds at least a part of the area of ​​the light-emitting element; the hollow structure includes a first opening and a second opening, and the second opening is located on a side of the first opening away from the driving substrate; along the thickness direction of the display panel, at least a part of the edge of the second opening overlaps with the first opening; At least a portion of the first light-shielding structure is located in the hollow structure.

2. The display panel according to claim 1, characterized in that: An opening area of ​​the second opening is smaller than an opening area of ​​the first opening.

3. The display panel according to claim 1, characterized in that: The auxiliary structure comprises a single film layer auxiliary structure.

4. The display panel according to claim 3, characterized in that: The single film layer auxiliary structure includes a negative photoresist layer.

5. The display panel according to claim 1, characterized in that: The auxiliary structure includes at least two auxiliary layers, and the at least two auxiliary layers include a first auxiliary layer and a second auxiliary layer; the first auxiliary layer is located on a side of the second auxiliary layer close to the drive substrate; the first opening is located in the first auxiliary layer, and the second opening is located in the second auxiliary layer.

6. The display panel according to claim 5, characterized in that: The material of the first auxiliary layer includes a non-photoresistive material soluble in a developer, and the material of the second auxiliary layer includes a photoresistive material.

7. The display panel according to claim 5, characterized in that: The thickness of the first auxiliary layer is greater than that of the second auxiliary layer.

8. The display panel according to claim 1, characterized in that: The hollow structure surrounding the same light emitting element includes at least one first opening and a plurality of second openings.

9. The display panel according to claim 8, characterized in that: Along the first direction, the plurality of second openings at least include a first opening section away from the light emitting element and a second opening section close to the light emitting element, and the opening area of ​​the second opening section is larger than the opening area of ​​the first opening section; The first direction intersects with a thickness direction of the display panel.

10. The display panel according to claim 9, characterized in that: Along the direction from the first opening section to the second opening section, the opening areas of the plurality of second openings increase sequentially.

11. The display panel according to claim 1, characterized in that: The display panel further includes a second light shielding structure; The second light shielding structure covers a surface of the auxiliary structure away from the driving substrate, and the second light shielding structure is connected to the first light shielding structure.

12. The display panel according to claim 1, characterized in that: Along the first direction, a distance D1 between the second opening and the light emitting element satisfies: D1>1 μm; and the first direction intersects with a thickness direction of the display panel.

13. The display panel according to claim 1, characterized in that: Along a first direction, the first opening includes a first side wall away from the light emitting element, and the second opening includes a second side wall away from the light emitting element; the first direction intersects with a thickness direction of the display panel; Along the first direction, a distance D2 between the first side wall and the second side wall satisfies: D2≤4 μm.

14. The display panel according to claim 1, characterized in that: The light emitting element comprises a light emitting element body; The auxiliary structure includes a first auxiliary surface away from the side of the driving substrate, and the light-emitting element body includes a first light-emitting surface away from the side of the driving substrate; the distance D3 between the first auxiliary surface and the first light-emitting surface and the height D4 of the light-emitting element body satisfy: D3 / D4≥1 / 4.

15. The display panel according to claim 1, characterized in that: The light emitting element comprises a light emitting element body; Along the thickness direction of the display panel, the auxiliary structure includes a first auxiliary surface away from the side of the driving substrate, and the light-emitting element body includes a first light-emitting surface away from the side of the driving substrate and a second light-emitting surface close to the side of the driving substrate; the distance between the first auxiliary surface and the driving substrate is smaller than the distance between the first light-emitting surface and the driving substrate, and greater than the distance between the second light-emitting surface and the driving substrate.

16. A method for preparing a display panel, characterized in that: include: Providing a drive substrate; transferring a plurality of light emitting elements to one side of the driving substrate; The light emitting element is electrically connected to the driving substrate; An auxiliary structure is prepared on one side of the driving substrate; a hollow structure is provided in the auxiliary structure, the hollow structure surrounds at least a part of the light emitting element, and the hollow structure includes a first opening and a second opening, the second opening is located on a side of the first opening away from the driving substrate; along the thickness direction of the display panel, at least a part of the edge of the second opening overlaps with the first opening; At least a portion of the first light shielding structure is filled into the hollow structure.

17. The method for manufacturing a display panel according to claim 16, characterized in that: Filling at least a portion of the light shielding structure into the hollow structure, including: The hollow structure is filled with at least a portion of the first light shielding structure by using inkjet printing technology.

18. The method for preparing a display panel according to claim 16, characterized in that: An auxiliary structure is prepared on one side of the driving substrate, comprising: preparing an auxiliary layer on one side of the driving substrate; The auxiliary layer is exposed, and the area of ​​the hollow structure is controlled according to the development time to form an auxiliary structure.

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

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