Display panel and display module

Abstract

The embodiment of the utility model provides a display panel and a display module. The display panel comprises a substrate, a plurality of light emitting devices and a plurality of isolation structures. The plurality of light-emitting devices are arranged on one side of the substrate; the at least one isolation structure is arranged between two adjacent light-emitting devices; wherein the isolation structure is a directional expansion structure, and the isolation structure is used for isolating two adjacent light-emitting devices. According to the display panel, the isolation structure is arranged between the two adjacent light-emitting devices, and after the light-emitting function layer of the display panel is prepared, the isolation structure is heated to expand by utilizing the thermal expansion effect of the isolation structure so as to isolate the two adjacent light-emitting devices, so that the pixel crosstalk phenomenon is effectively solved; and the color crossing problem between two adjacent light-emitting devices is effectively avoided. And secondly, by utilizing the heating expansion characteristic of the isolation structure, the isolation structure can be arranged between the two adjacent light-emitting devices in advance, so that the preparation process of the display panel is simplified, the manufacturing cost is reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, in particular to a display panel and a display module. BACKGROUND

[0002] Compared with the traditional liquid crystal display (LCD) technology, the organic light emitting diode (OLED) display has the advantages of self-luminous, high brightness, higher contrast, wider visual angle, faster response speed, etc. The organic light emitting diode display is widely used in smart devices, computer devices, and entertainment devices such as television and movies.

[0003] The organic layer with high conductivity (such as the charge generation layer) in the organic light emitting diode display is easy to cause serious lateral leakage current between the pixels of the display panel, resulting in the display panel pixel having a bad color mixing at low gray scale, which seriously affects the low gray scale yield and picture quality. At present, how to effectively realize the isolation between the pixels and improve the display effect is still a big challenge for the technical personnel. UTILITY MODEL CONTENT

[0004] The embodiments of the present application provide a display panel and a display module to solve or alleviate one or more technical problems in the prior art.

[0005] As an aspect of the embodiments of the present application, the embodiments of the present application provide a display panel, comprising:

[0006] a substrate substrate;

[0007] a plurality of light emitting devices disposed on one side of the substrate substrate;

[0008] a plurality of isolation structures, at least one of the plurality of isolation structures is disposed between two adjacent light emitting devices;

[0009] The isolation structure is a directional expansion structure, and the isolation structure is used to isolate the two adjacent light emitting devices.

[0010] In some embodiments, the isolation structure includes a carrier and at least one expansion body, the carrier is located between the two adjacent light emitting devices, the carrier defines an output port facing away from the substrate substrate, the at least one expansion body is disposed in the carrier, the expansion body is used to isolate the two adjacent light emitting devices, and the expansion body is a directional expansion structure.

[0011] In some embodiments, the carrier is provided with a photoresist body, and the at least one expansion body is disposed in the photoresist body.

[0012] In some embodiments, the material of the expansion body includes graphene.

[0013] In some embodiments, the material of the carrier comprises an organic aromatic compound.

[0014] In some embodiments, the light emitting device comprises a light emitting functional layer, the light emitting functional layer comprises at least a first light emitting layer, a second light emitting layer and at least one charge generating layer, the first light emitting layer is disposed on one side of the substrate, the at least one charge generating layer is disposed on a side of the first light emitting layer away from the substrate, and the second light emitting layer is disposed on a side of the at least one charge generating layer away from the substrate.

[0015] The orthogonal projection of the charge generating layer on the substrate and the orthogonal projection of the isolation structure on the substrate at least partially overlap, and the isolation structure can expand to isolate the part of the charge generating layer between the adjacent two openings when heated.

[0016] In some embodiments, the light emitting device further comprises a first electrode and a second electrode, the first electrode is disposed on one side of the substrate, the light emitting functional layer is disposed on a side of the first electrode away from the substrate, and the second electrode is disposed on a side of the light emitting functional layer away from the substrate.

[0017] In some embodiments, the display panel further comprises a pixel definition layer, the pixel definition layer is disposed on a side of the first electrode away from the substrate, the pixel definition layer is spaced apart to form a plurality of openings, and the light emitting functional layer is disposed on a side of the pixel definition layer away from the substrate and covers the plurality of openings.

[0018] The isolation structure is disposed on a side of the pixel definition layer away from the substrate.

[0019] In some embodiments, at least one of the plurality of isolation structures is disposed at a connection between a side wall of the opening and a side surface of the pixel definition layer away from the substrate.

[0020] In some embodiments, a receiving groove is defined on a side surface of the pixel definition layer away from the substrate, the receiving groove is located between the adjacent two openings, and at least one of the plurality of isolation structures is disposed in the receiving groove.

[0021] In some embodiments, the light emitting device is a stacked light emitting device.

[0022] As another aspect of the present application, a display module is also provided, which comprises the display panel of any one of the above.

[0023] The embodiments of the present application have the following beneficial effects:

[0024] Based on the aforementioned display panel and display module, an isolation structure can be set between two adjacent light-emitting devices. After the light-emitting functional layer of the display panel is fabricated, the thermal expansion effect of the isolation structure causes it to expand and isolate the two adjacent light-emitting devices. This effectively prevents the migration of carriers in the high-mobility film layer of one light-emitting device to another, thus solving the pixel crosstalk phenomenon and avoiding color mixing between adjacent light-emitting devices. Furthermore, this application utilizes the thermal expansion characteristics of the isolation structure to pre-set an isolation structure between two adjacent light-emitting devices. Then, a light-emitting functional layer is set on the side of the isolation structure away from the substrate. Finally, the isolation structure is heated to expand and isolate the portion of the light-emitting functional layer located between the two adjacent openings. This allows the thermally expanded isolation structure to isolate the two adjacent light-emitting devices. Compared to the isolation structures in related technologies, this application reduces the process steps of patterning on the pixel delimiting layer to form isolation grooves and high separation pillars, thereby simplifying the display panel fabrication process, reducing manufacturing costs, and improving production efficiency. Furthermore, the embodiments of this application reduce complex patterning process steps, thereby reducing defects that may be introduced during the manufacturing process of the display panel and effectively improving the yield of the display panel. Attached Figure Description

[0025] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0026] Figure 1 This diagram illustrates the structure of a display panel according to an embodiment of the present application.

[0027] Figure 2 A schematic diagram of the isolation structure (unexpanded state) according to an embodiment of this application is shown;

[0028] Figure 3 A schematic diagram of the isolation structure (inflated state) according to an embodiment of this application is shown;

[0029] Figure 4 A schematic diagram of the structure of a display panel according to an embodiment of this application is shown (the isolation structure is in an unexpanded state);

[0030] Figure 5 A schematic diagram of the structure of a display panel according to an embodiment of this application is shown (the isolation structure is in an expanded state);

[0031] Figure 6A structural schematic diagram of a display panel according to another embodiment of the present application (isolation structure in an unexpanded state) is shown.

[0032] Figure 7 A structural schematic diagram of a display panel according to another embodiment of the present application (isolation structure in an expanded state) is shown.

[0033] Figure 8 A flowchart of a preparation method according to an embodiment of the present application is shown.

[0034] Legend of reference signs:

[0035] 1. A display panel;

[0036] 10. A substrate base plate;

[0037] 20. A light emitting device; 210, a light emitting functional layer; 211, a first light emitting layer; 212, a second light emitting layer; 213, a charge generating layer; 220, a first electrode; 230, a second electrode;

[0038] 30. An isolation structure; 310, a carrier; 311, an output port; 320, an expansion body; 330, a photoresist body;

[0039] 40. A pixel definition layer; 410, an opening; 420, a containing groove. DETAILED DESCRIPTION

[0040] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0041] Compared with traditional liquid crystal display (LCD) technology, organic electroluminescent device (OLED) displays have the advantages of self-emission, high brightness, higher contrast, wider visual field, faster response speed, etc. Organic electroluminescent device (OLED) displays are widely used in smart devices, computer devices, and entertainment devices such as televisions and movies.

[0042] In the related art, the organic layer (such as the charge generating layer, etc.) with high conductivity in the organic electroluminescent device (OLED) display easily leads to serious lateral leakage current between pixels of the display panel, resulting in the display panel pixel having a bad problem of color mixing at low gray scale, which seriously affects the low gray scale Gamma (referring to the brightness of the reaction color at different gray scales) yield and picture quality.

[0043] Currently, in order to solve the technical problem of serious horizontal leakage current between pixels, technical means such as tall fence (TF) and dig on wafer (DOW) have been proposed, but the processes of tall fence and dig on wafer are complex and the preparation cost is high.

[0044] Figure 1 A structural schematic diagram of a display panel 1 according to an embodiment of the present application is shown, Figure 2 A structural schematic diagram of an isolation structure 30 (unexpanded state) according to an embodiment of the present application is shown, Figure 3 A structural schematic diagram of an isolation structure 30 (expanded state) according to an embodiment of the present application is shown, Figure 4 A structural schematic diagram of a display panel 1 according to an embodiment of the present application is shown (isolation structure 30 is in an unexpanded state), Figure 5 A structural schematic diagram of a display panel 1 according to an embodiment of the present application is shown (isolation structure 30 is in an expanded state), Figure 6 A structural schematic diagram of a display panel 1 according to another embodiment of the present application is shown (isolation structure 30 is in an unexpanded state), Figure 7 A structural schematic diagram of a display panel 1 according to another embodiment of the present application is shown (isolation structure 30 is in an expanded state), see Figures 1 to 7 An embodiment of the present application provides a display panel 1, which comprises a substrate 10, a plurality of light emitting devices 20, and a plurality of isolation structures 30. The plurality of light emitting devices 20 are arranged on one side of the substrate 10, and each light emitting device 20 corresponds to one pixel. At least one isolation structure 30 in the plurality of isolation structures 30 is arranged between two adjacent light emitting devices 20, that is, at least one isolation structure 30, for example, one, two or three, is arranged between two adjacent light emitting devices 20. The isolation structure 30 is a directional expansion structure, and the isolation structure 30 is subjected to thermal expansion forming to isolate the two adjacent light emitting devices 20.

[0045] According to the display panel 1 provided by the present application, the isolation structure 30 is arranged between the two adjacent light emitting devices 20, and then the light emitting functional layer 210 is arranged on the side of the isolation structure 30 away from the substrate 10. After the preparation of the light emitting functional layer 210 of the display panel 1, the isolation structure 30 is expanded by the thermal expansion effect to isolate the charge generation layer 213 in the light emitting functional layer 210, and then to isolate the two adjacent light emitting devices 20, that is, to isolate the carriers in the film layer with high mobility in the light emitting device 20 from migrating to the other light emitting device 20, so as to effectively avoid the pixel crosstalk phenomenon, thereby solving the color crosstalk problem between the two adjacent light emitting devices 20. Secondly, by using the thermal expansion characteristic of the isolation structure 30, the isolation structure 30 can be arranged between the two adjacent light emitting devices 20 in advance, and then the light emitting functional layer 210 is arranged on the side of the isolation structure 30 away from the substrate 10. Finally, the isolation structure 30 is expanded by heating to isolate the part of the light emitting functional layer 210 between the two adjacent openings 410, so that the expanded isolation structure 30 can isolate the two adjacent light emitting devices 20. By such arrangement, compared with the isolation structure in the related art, the present application can reduce the process steps of patterning on the pixel defining layer to form the isolation groove and the high separation column, thereby simplifying the preparation process of the display panel 1, reducing the manufacturing cost, and improving the production efficiency. In addition, the embodiment of the present application reduces the complex patterning process steps, thereby effectively improving the yield of the display panel 1.

[0046] In some examples, the isolation structure 30 can include a material with high thermal conductivity and high thermal expansion coefficient. In the embodiment of the present application, the shape of the isolation structure 30 can expand when heated, and the charge generation layer 213 in the light emitting functional layer 210 is isolated during the expansion of the isolation structure 30.

[0047] For example, the volume of the isolation structure 30 before expansion is 500 cubic microns, and the volume of the isolation structure 30 after expansion is 1000 cubic microns. It should be noted that the volume of the isolation structure 30 is not limited to the foregoing example.

[0048] In some embodiments, referring to Figures 2 to 4 , the isolation structure 30 includes a carrier 310 and at least one expansion body 320. The carrier 310 is located between the two adjacent light emitting devices 20, and the carrier 310 defines an output port 311 facing away from the substrate 10. The at least one expansion body 320 is arranged in the carrier 310. The expansion body 320 is a directional expansion structure, which can expand and protrude from the output port 311 of the carrier 310 when heated to isolate the charge generation layer 213 in the light emitting functional layer 210, thereby playing a role of isolating the two adjacent light emitting devices 20.

[0049] Exemplarily, the application first sets the carrier 310 between two adjacent light emitting devices 20, the output port 311 of the carrier 310 faces away from the substrate substrate 10, the expansion body 320 is arranged in the inside of the carrier 310, then the light emitting functional layer 210 is arranged on the side of the carrier 310 away from the substrate substrate 10, so that the light emitting functional layer 210 covers the output port 311 of the carrier 310, finally the expansion body 320 is heated to expand to isolate the part structure of the light emitting functional layer 210 between the two adjacent openings 410, that is, to isolate the charge generation layer 213 in the light emitting functional layer 210, so that the expansion body 320 after heating and expansion can isolate the two adjacent light emitting devices 20, thereby improving the cross-coloring between pixels. In addition, the embodiment of the application can also improve the color gamut and low gray scale characteristics of the display panel 1, thereby enhancing the display effect of the display panel 1 and avoiding the influence of the expansion body 320 on other film layers during expansion.

[0050] According to the embodiment of the application, referring to Figures 4 to 7 , the output port 311 of the carrier 310 faces away from the substrate substrate 10, and the expansion body 320 is arranged in the inside of the carrier 310, so that the expansion body 320 can only protrude in the direction away from the substrate substrate 10 through the output port 311 of the carrier 310 after heating and expansion. By such arrangement, the expansion body 320 can only protrude in the direction away from the substrate substrate 10 after expansion, so as to accurately isolate the charge generation layer 213 in the light emitting functional layer 210.

[0051] It should be noted that the number of the at least one expansion body 320 can be 10, 20, 30, etc., as long as the expansion body 320 can protrude in the direction away from the substrate substrate 10 through the output port 311 of the carrier 310 after heating and expansion, and isolate the charge generation layer 213 in the light emitting functional layer 210. The specific number of the expansion body 320 is not limited herein.

[0052] In some examples, the expansion body 320 is accommodated in the inside of the carrier 310 before heating and expansion, so as to avoid the unevenness of the light emitting functional layer 210 when the light emitting functional layer 210 is arranged on the side of the carrier 310 away from the substrate substrate 10 due to the protrusion of the expansion body 320 from the output port 311 of the carrier 310.

[0053] In some embodiments, the material of the carrier 310 includes an organic aromatic compound, which has good adsorption properties, so that the carrier 310 made of the organic aromatic compound can adsorb enough expansion bodies 320, so that the expansion bodies 320 can be uniformly adsorbed in the inside of the carrier 310, ensuring that the expansion bodies 320 can effectively expand and isolate the adjacent light emitting devices 20 during the heating process, thereby improving the isolation effect.

[0054] Exemplarily, the carrier 310 comprises a support seat made of an organic aromatic compound, a longitudinal section of the support seat is in a U shape, and an output port 311 of the support seat faces away from the substrate 10, so that the expansion body 320 can be adsorbed on an inner wall surface of the support seat and can protrude from the output port 311 of the carrier 310 when the expansion body 320 is heated and expanded to block the part of the light-emitting functional layer 210 between two adjacent openings 410. In this way, the expansion body 320 only protrudes from the output port 311 when heated and expanded, and blocks the light-emitting functional layer 210 at a position corresponding to the output port 311 of the carrier 310, so that the expansion body 320 can accurately direct and block the light-emitting functional layer 210, effectively avoiding interference of the expansion body 320 with other functional layers during expansion, and ensuring the integrity and functional stability of each layer structure of the display panel 1.

[0055] In some examples, the organic aromatic compound includes, but is not limited to, poly-p-phenylenediamine, phthalocyanine, benzimidazole, polycyclic aromatic hydrocarbon, pyrrole and the like. It should be noted that the specific composition of the organic aromatic compound is only illustrative and is not limited to the foregoing examples, and the carrier 310 made of the organic aromatic compound only needs to realize the function of adsorbing graphene, which is not limited herein.

[0056] In some embodiments, the material of the expansion body 320 includes graphene, which has controllable expansion characteristics when heated, and is a material with high thermal conductivity and high thermal expansion coefficient.

[0057] Exemplarily, the expansion body 320 made of graphene is arranged inside the carrier 310, and the carrier 310 made of the organic aromatic compound adsorbs the expansion body 320 made of graphene on the inner wall of the carrier 310.

[0058] According to the embodiments of the present application, the expansion degree of graphene can be accurately controlled by controlling the temperature and time of heating, and it can be ensured that the expansion body 320 can protrude from the output port 311 of the carrier 310 when heated and expanded to block the charge generation layer 213 in the light-emitting functional layer 210 at a preset temperature and a preset time. Secondly, graphene has high strength, and the expansion body 320 made of graphene can enhance the mechanical strength and stability of the isolation structure 30, and ensure that the isolation structure 30 is not easily deformed or damaged during long-term use. Furthermore, graphene has extremely high thermal conductivity and strong stability, so the expansion body 320 can be quickly heated, so that the expansion body 320 remains stable after being heated and expanded and protruding from the output port 311 of the carrier 310 to block the light-emitting functional layer 210, avoiding affecting other film layers of the display panel 1, and thereby improving the reliability of the display panel 1.

[0059] Exemplarily, the preset temperature and the preset time can be determined according to the number of the expansion bodies 320 in the carrier 310 and the size of the expansion bodies 320 required to protrude the output port 311 of the carrier 310, which is not limited herein.

[0060] In some embodiments, referring to Figure 2 and Figure 3 , the carrier 310 is provided with a photoresist body 330, and the at least one expansion body 320 is arranged in the photoresist body 330. In this way, the photoresist body 330 can provide good fixation for the expansion body 320, so that the expansion body 320 can be stably fixed in the interior of the carrier 310, preventing the expansion body 320 from moving or falling off during manufacturing and use. Secondly, the photoresist body 330 will expand when heated, so that the photoresist body 330 is consistent with the properties of graphene, and the photoresist body 330 can expand with the expansion of the expansion body 320 and can expand to isolate the part of the light-emitting functional layer 210 between the adjacent two openings 410 when heated. Furthermore, the size of graphene is small, so that the graphene is wrapped in the photoresist body 330, and the directional expansion of the expansion body 320 is realized by the output port 311 arranged in the carrier 310, so as to accurately and directionally isolate the light-emitting functional layer 210, effectively avoiding the interference of the expansion body 320 to other functional layers during the expansion process, and ensuring the integrity and functional stability of each layer structure of the display panel 1.

[0061] According to the embodiments of the present application, the expansion body 320 can extrude the photoresist body 330 in the expanded state. The photoresist body 330 can expand in response to the expansion of the expansion body 320. Furthermore, the photoresist body 330 has the property of not conducting electricity, so that the photoresist body 330 can realize the isolation of the charge generation layer 213 between the adjacent two light-emitting devices 20 and the non-conduction between them.

[0062] In some embodiments, referring to Figures 4 to 7 , the light-emitting device 20 includes a light-emitting functional layer 210, and the light-emitting functional layer 210 includes at least a first light-emitting layer 211, a second light-emitting layer 212, and at least one charge generation layer 213. The first light-emitting layer 211 is arranged on one side of the substrate substrate 10, the at least one charge generation layer 213 is arranged on the side of the first light-emitting layer 211 away from the substrate substrate 10, and the second light-emitting layer 212 is arranged on the side of the at least one charge generation layer 213 away from the substrate substrate 10. The charge generation layer 213 is used to generate carriers for the first light-emitting layer 211 and the second light-emitting layer 212 on the adjacent two sides, and to transmit and inject the carriers.

[0063] The orthogonal projection of the charge generation layer 213 on the substrate 10 and the orthogonal projection of the isolation structure 30 on the substrate 10 at least partially overlap, and the isolation structure 30 can expand to isolate the part of the charge generation layer 213 between two adjacent openings 410 when heated.

[0064] Exemplarily, before the expansion body 320 expands due to heating, the charge generation layer 213 covers the carrier 310 and the expansion body 320, so that the expansion body 320 isolates the part of the charge generation layer 213 between two adjacent openings 410 when heated, and thus the charge generation layer 213 corresponding to each opening 410 is independent of each other, so that the light emission of each pixel is independently completed. Secondly, the isolation structure 30 also has a physical limiting effect on the light emitted by the first light-emitting layer 211 and the second light-emitting layer 212 corresponding to each pixel, and thus the isolation structure 30 realizes the segmentation of the pixels from the aspects of electrical function and optical effect, and thus the problem of difficult pixel segmentation of the display panel 1 with ultra-high resolution can be effectively solved. The display panel 1 with ultra-high resolution can be applied to the silicon-based OLED display panel 1, the light emission between pixels is independent, and the isolation structure has an optical blocking effect, so that the cross-color between pixels can be improved, and in addition, the color gamut and low gray scale characteristics of the display panel 1 can be improved, thereby enhancing the display effect of the display panel 1.

[0065] It can be understood that the expansion body 320 can realize the differentiated destruction of the charge generation layer 213 between pixels by changing the expansion degree, and can realize the isolation effect of the charge generation layer 213 between pixels of the three-layer or even multi-layer light-emitting device 20, thereby avoiding the problem of cross-color between pixels, and thus improving the color gamut and low gray scale characteristics of the display panel 1.

[0066] In some embodiments, referring to Figures 4 to 7 The light-emitting device 20 further includes a first electrode 220 and a second electrode 230. The first electrode 220 is disposed on one side of the substrate 10. The light-emitting functional layer 210 is disposed on the side of the first electrode 220 away from the substrate 10. The second electrode 230 is disposed on the side of the light-emitting functional layer 210 away from the substrate 10.

[0067] In an alternative implementation, the first electrode 220 includes an anode, and the second electrode 230 includes a cathode.

[0068] The first electrode 220 and the second electrode 230 can include a conductive oxide. Specifically, the first electrode 220 can include indium tin oxide (ITO), and the second electrode 230 can include indium zinc oxide (IZO).

[0069] In some embodiments, referring to Figures 4 to 7The display panel 1 further comprises a pixel definition layer 40. The pixel definition layer 40 is disposed on the side of the first electrode 220 away from the substrate 10, and the pixel definition layer 40 is provided with a plurality of openings 410. The light-emitting functional layer 210 is disposed on the side of the pixel definition layer 40 away from the substrate 10, and the light-emitting functional layer 210 covers the plurality of openings 410. The isolation structure 30 is disposed on the side of the pixel definition layer 40 away from the substrate 10.

[0070] According to the embodiment of the present application, the charge generation layer 213 is disposed on the side away from the pixel definition layer 40, and therefore, in order to isolate the charge generation layer 213, the present application prepares the carrier 310 on the side of the pixel definition layer 40 away from the substrate 10 after the preparation of the pixel definition layer 40, then fills graphene in the carrier 310, and then sets the charge generation layer 213 on the side of the carrier 310 away from the substrate 10, so that the expansion body 320 in the carrier 310 expands when heated, thereby isolating the part of the charge generation layer 213 between the two adjacent openings 410.

[0071] In some embodiments, referring to Figure 4 and Figure 5 , at least one of the plurality of isolation structures 30 is disposed at the junction of the side wall of the opening 410 and the side of the pixel definition layer 40 away from the substrate 10.

[0072] For example, the two adjacent openings 410 are a first opening 410 and a second opening 410, and two isolation structures 30 are disposed between the first opening 410 and the second opening 410, and the two isolation structures 30 are a first isolation structure 30 and a second isolation structure 30. The first isolation structure 30 is disposed at the junction of the side wall of the first opening 410 and the side of the pixel definition layer 40 away from the substrate 10, and the second isolation structure 30 is disposed at the junction of the side wall of the second opening 410 and the side of the pixel definition layer 40 away from the substrate 10.

[0073] In some other embodiments, referring to Figure 6 and Figure 7 , the side of the pixel definition layer 40 away from the substrate 10 is defined with a receiving groove 420, the receiving groove 420 is located between the two adjacent openings 410, and at least one of the plurality of isolation structures 30 is disposed in the receiving groove 420.

[0074] For example, the two adjacent openings 410 are a first opening 410 and a second opening 410, and two isolation structures 30 are disposed between the first opening 410 and the second opening 410, and the two isolation structures 30 are a first isolation structure 30 and a second isolation structure 30. The first isolation structure 30 and the second isolation structure 30 are disposed in the receiving groove 420 between the first opening 410 and the second opening 410.

[0075] In yet some embodiments, referring to Figure 1 The pixel definition layer 40 is defined with a receiving groove 420 on the side away from the substrate 10 between two adjacent openings 410, and at least one of the plurality of isolation structures 30 is arranged in the receiving groove 420. At least one of the plurality of isolation structures 30 is arranged at the junction of the sidewall of the opening 410 and the side of the pixel definition layer 40 away from the substrate 10.

[0076] For example, the two adjacent openings 410 are a first opening 410 and a second opening 410, and two isolation structures 30 are arranged between the first opening 410 and the second opening 410, and the two isolation structures 30 are a first isolation structure 30 and a second isolation structure 30. The first isolation structure 30 is arranged in the receiving groove 420 between the first opening 410 and the second opening 410, and the second isolation structure 30 is arranged at the junction of the sidewall of the second opening 410 and the side of the pixel definition layer 40 away from the substrate 10.

[0077] In some embodiments, the light emitting device 20 is a stacked light emitting device 20.

[0078] In some embodiments, the display panel 1 includes a first light emitting area, a second light emitting area, and a third light emitting area. The first light emitting area, the second light emitting area, and the third light emitting area correspond to one light emitting device 20 respectively. The first light emitting area, the second light emitting area, and the third light emitting area can emit red, green, and blue light respectively. Then the first light emitting area can be a red light emitting area, the second light emitting area can be a green light emitting area, and the third light emitting area can be a blue light emitting area.

[0079] The display panel 1 can also be provided with a color filter layer of a corresponding color on the side of the second electrode 230 away from the substrate 10 in the first light emitting area, the second light emitting area, and the third light emitting area.

[0080] In some embodiments, the first electrodes 220 in the first light emitting area, the second light emitting area, and the third light emitting area are independent of each other and have different thicknesses, thereby forming a strong microcavity structure. Different thicknesses of the first electrodes 220 are used to excite light emitting areas of different colors, so the first electrodes 220 in each light emitting area are independent of each other and have different thicknesses. For example, the thicknesses of the first electrodes 220 in the first light emitting area, the second light emitting area, and the third light emitting area can gradually decrease.

[0081] In other embodiments, the first electrodes 220 in the first light emitting area, the second light emitting area, and the third light emitting area are independent of each other and have equal thicknesses, thereby forming a weak microcavity structure. The same thickness of the first electrodes 220 is used to excite light emitting areas of different colors.

[0082] Figure 8 A flowchart of a preparation method according to an embodiment of the present application is shown in FIG. 1. As another aspect of the present application, an embodiment of the present application further provides a preparation method of a display panel 1, which comprises: Figure 8 A substrate 10 is provided, and a first electrode 220 is formed on one side of the substrate 10.

[0083] In step S1, a pixel defining layer is formed on the side of the first electrode 220 away from the substrate 10, and a plurality of openings 410 are arranged at intervals in the pixel defining layer.

[0084] In step S2, an isolation structure 30 is formed on the side of the pixel defining layer away from the substrate 10.

[0085] Specifically, the isolation structure 30 comprises an expansion body 320, and the isolation structure 30 prepared in this step has not yet been expanded by heat, so that the isolation structure 30 cannot play a role of isolation.

[0086] In step S3, a light-emitting functional layer 210 and a second electrode 230 are formed on the side of the openings 410 and the pixel defining layer away from the substrate 10.

[0087] Specifically, the light-emitting functional layer 210 comprises at least a first light-emitting layer 211, a second light-emitting layer 212, and at least one charge generation layer 213, and the charge generation layer 213 prepared in this step has not yet been isolated, i.e., the charge generation layers 213 between two adjacent light-emitting devices 20 are in the same layer and continuous.

[0088] In step S4, the isolation structure 30 is heated, and the isolation structure 30 expands when heated to isolate the part of the light-emitting functional layer 210 between two adjacent openings 410.

[0089] Specifically, the isolation structure 30 is expanded by heat to isolate two adjacent light-emitting devices 20 after the preparation of the light-emitting functional layer 210 of the display panel 1, i.e., to isolate the carriers in the film layer with high mobility in the light-emitting device 20 from migrating to another light-emitting device 20, effectively solving the pixel crosstalk phenomenon and effectively avoiding the color mixing problem between two adjacent light-emitting devices 20.

[0090]

[0091] ​As another aspect of the present application, the present application provides a display module comprising the display panel 1 according to any one of the above embodiments or the display panel 1 prepared by the preparation method above. Thus, the display module has all the features and advantages of the display panel 1 as described above, which will not be repeated here. In general, by arranging the isolation structure 30 between the two adjacent light emitting devices 20, and then arranging the light emitting functional layer 210 on the side of the isolation structure 30 away from the substrate 10, the heat expansion effect of the isolation structure 30 is used to make the isolation structure 30 expand by heat to block the charge generation layer 213 in the light emitting functional layer 210 after the preparation of the light emitting functional layer 210 of the display panel 1, and then the two adjacent light emitting devices 20 are isolated, that is, the possibility of the carriers in the film layer with high mobility in the light emitting device 20 migrating to another light emitting device 20 is blocked, effectively solving the pixel crosstalk phenomenon and effectively avoiding the color crosstalk problem between the two adjacent light emitting devices 20. Secondly, by using the heat expansion characteristics of the isolation structure 30, the isolation structure 30 can be arranged in advance between the two adjacent light emitting devices 20, and then the light emitting functional layer 210 is arranged on the side of the isolation structure 30 away from the substrate 10, and finally the isolation structure 30 is heated to expand to block the part of the light emitting functional layer 210 located between the two adjacent openings 410, so that the isolation structure 30 after heat expansion can isolate the two adjacent light emitting devices 20. By such arrangement, compared with the blocking structure in the related art, the present application can reduce the process steps of patterning on the pixel defining layer to form the blocking groove and the high separation column, thereby simplifying the preparation process of the display panel 1, reducing the manufacturing cost, and improving the production efficiency. In addition, the embodiment of the present application reduces the complex patterning process steps, reduces the defects that may be introduced in the manufacturing process of the display panel 1, thereby effectively improving the yield of the display panel 1.

[0092] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0093] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the technical features indicated. Thus, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0094] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected, or can be communicated; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0095] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0096] The above disclosure provides many different implementations or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0097] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various changes or replacements within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate; a plurality of light-emitting devices disposed on one side of the substrate; a plurality of isolation structures, at least one of the plurality of isolation structures being disposed between two adjacent light-emitting devices; wherein the isolation structure is a directional expansion structure, and the isolation structure is configured to isolate the two adjacent light-emitting devices; the isolation structure comprises a carrier and at least one expansion body, the carrier is located between the two adjacent light-emitting devices, and the carrier defines an output port facing away from the substrate; the at least one expansion body is disposed in the carrier, and the expansion body is configured to isolate the two adjacent light-emitting devices, and the expansion body is a directional expansion structure.

2. The display panel of claim 1, wherein, The carrier is provided with a photoresist body, and the at least one expansion body is disposed in the photoresist body.

3. The display panel of claim 1, wherein, The material of the expansion body comprises graphene.

4. The display panel of claim 1, wherein, The material of the carrier comprises an organic aromatic compound.

5. The display panel of any one of claims 1 to 4, wherein, The light-emitting device comprises a light-emitting functional layer, the light-emitting functional layer comprises at least a first light-emitting layer, a second light-emitting layer, and at least one charge generation layer; the first light-emitting layer is disposed on one side of the substrate; the at least one charge generation layer is disposed on a side of the first light-emitting layer away from the substrate; and the second light-emitting layer is disposed on a side of the at least one charge generation layer away from the substrate. The charge generation layer has a projection on the substrate, and the projection at least partially overlaps with a projection of the isolation structure on the substrate; and the isolation structure can expand when heated to isolate the part of the charge generation layer between the two adjacent openings.

6. The display panel of claim 5, wherein, The light-emitting device further comprises a first electrode and a second electrode; the first electrode is disposed on one side of the substrate; the light-emitting functional layer is disposed on a side of the first electrode away from the substrate; and the second electrode is disposed on a side of the light-emitting functional layer away from the substrate.

7. The display panel of claim 6, wherein, The display panel further comprises a pixel definition layer; the pixel definition layer is disposed on a side of the first electrode away from the substrate, and the pixel definition layer is spaced apart to define a plurality of openings; the light-emitting functional layer is disposed on a side of the pixel definition layer away from the substrate and covers the plurality of openings; wherein the isolation structure is disposed on a side of the pixel definition layer away from the substrate.

8. The display panel of claim 7, wherein, At least one of the plurality of isolation structures is disposed at a junction between a sidewall of the opening and a side surface of the pixel definition layer away from the substrate.

9. The display panel of claim 7, wherein, The side surface of the pixel definition layer away from the substrate defines a receiving groove, and the receiving groove is located between two adjacent openings; and at least one of the plurality of isolation structures is disposed in the receiving groove.

10. The display panel of claim 7, wherein, The light-emitting device is a stacked light-emitting device.

11. A display module, characterized by The display panel comprises any one of the display panels according to claims 1 to 10. The display panel comprises any one of the display panels according to claims 1 to 10.

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