Display substrate and display panel

Abstract

The present disclosure provides a display substrate and a display panel, and belongs to the technical field of display. The display substrate comprises a substrate, a pixel definition layer, a plurality of light emitting devices, and an isolation component. The pixel definition layer is arranged on the substrate and has a first accommodating portion. Each of the plurality of light emitting devices comprises a first electrode, a light emitting layer, and a second electrode. The first electrode is located on the side of the pixel definition layer close to the substrate, and the first accommodating portion of the pixel definition layer exposes the first electrode. The light emitting layer covers at least the first accommodating portion. The second electrode is located on the side of the light emitting layer away from the substrate. The isolation component is arranged between the adjacent light emitting devices, and is configured to block the charge transmitted between the light emitting devices.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of display, and particularly relates to a display substrate and a display panel. BACKGROUND

[0002] Organic electroluminescence display (OLED) as a new generation of display technology is gradually receiving more attention, and its display performance is more excellent than that of liquid crystal display (LCD), and has advantages of good display effect, low power consumption, high flexibility, and ultra-thin, etc. At present, OLED mainly occupies the fields of television and mobile phone, and among them, OLED micro display is commonly applied in the technical fields of augmented reality (AR), virtual reality (VR), etc. In the future, it may face a new round of production capacity explosion with the application of metaverse, but such products have strict requirements on the image sampling rate (PPI), that is, the number of pixels per inch. At the same time, with the rapid development of the electric vehicle industry, the application scenarios of OLED are further expanded, and it is predicted that a large number of OLED screens will be used for vehicle display in the future, but the vehicle display has high requirements on the service life of the device, and the future demand is to cope with tandem organic light-emitting diode (Tandem OLED). SUMMARY

[0003] The present disclosure aims to at least solve one of the technical problems existing in the prior art, and provide a display substrate and a display panel.

[0004] In a first aspect, a technical solution adopted to solve the technical problems of the present disclosure is a display substrate, comprising: a substrate substrate; a pixel definition layer, the pixel definition layer is arranged on the substrate substrate, and has a first accommodating part; a plurality of light-emitting devices, each of the plurality of light-emitting devices comprises a first electrode, a light-emitting layer and a second electrode, the first electrode is located on the side of the pixel definition layer close to the substrate substrate, and the first accommodating part of the pixel definition layer exposes the first electrode, the light-emitting layer covers at least the first accommodating part, and the second electrode is located on the side of the light-emitting layer away from the substrate substrate; and an isolation component, the isolation component is arranged between the adjacent light-emitting devices, and the isolation component is configured to block the charge transmitted between the light-emitting devices.

[0005] In some embodiments, the pixel definition layer further has a pixel barrier wall defining the first accommodating part; the pixel barrier wall is doped with a magnetic material, and is multiplexed as the isolation component.

[0006] In some embodiments, the magnetic-like material is a ferrite-like material.

[0007] In some embodiments, the pixel defining layer further has a second accommodating portion between the first accommodating portions arranged adjacently, and the isolation component is arranged in the second accommodating portion.

[0008] In some embodiments, the second accommodating portion penetrates the pixel defining layer along a thickness direction perpendicular to the substrate.

[0009] In some embodiments, the material of the isolation component is a chelating resin or a nanomaterial.

[0010] In some embodiments, the nanomaterial is an organic nanomaterial containing one or more functional groups of NO2, CN, F, Cl, Br, and I.

[0011] In some embodiments, the nanomaterial is an inorganic nanomaterial containing one or more metal oxides of nanometer titanium dioxide and nanometer vanadium pentoxide.

[0012] In some embodiments, the light emitting device further comprises, between the first electrode and the light emitting layer, a hole injection layer, a hole transport layer, and an electron blocking layer arranged in sequence along a direction in which the first electrode points to the second electrode; and further comprises, between the light emitting layer and the second electrode, a hole blocking layer, an electron transport layer, and an electron injection layer arranged in sequence along the direction in which the first electrode points to the second electrode.

[0013] In some embodiments, the light emitting layer of the light emitting device has a plurality of sub-light emitting layers, and a charge separation generation layer connecting the sub-light emitting layers arranged adjacently.

[0014] In some embodiments, the charge separation generation layer comprises, arranged in sequence along a direction in which the first electrode points to the second electrode, a first charge transport layer, a charge generation layer, and a second charge transport layer.

[0015] In some embodiments, a distance between a surface of the substrate away from the isolation component and the substrate is a first distance, a distance between a surface of the substrate away from the light emitting layer and the substrate is a second distance, and the first distance is not greater than the second distance.

[0016] In a second aspect, the embodiments of the present disclosure further provide a display panel comprising the display substrate as described in any one of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a display substrate provided by the embodiments of the present disclosure;

[0018] Figure 2 Another structural schematic diagram of a display substrate provided by an embodiment of the present disclosure;

[0019] Figure 3a Another charge movement schematic diagram when crosstalk occurs in an embodiment of the present disclosure;

[0020] Figure 3b Another charge movement schematic diagram when crosstalk occurs in an embodiment of the present disclosure;

[0021] Figure 4a A principle diagram for blocking lateral charge transport in an embodiment of the present disclosure;

[0022] Figure 4b Another principle diagram for blocking lateral charge transport in an embodiment of the present disclosure;

[0023] Figure 5 Another structural schematic diagram of a display substrate provided by an embodiment of the present disclosure;

[0024] Figure 6 A comparison diagram of spectral analysis before and after crosstalk improvement in an embodiment of the present disclosure;

[0025] Figure 7 A schematic diagram of a film layer structure of a light-emitting device in an embodiment of the present disclosure;

[0026] Figure 8 Another structural schematic diagram of a display substrate provided by an embodiment of the present disclosure.

[0027] Wherein the reference signs are: substrate 10; pixel definition layer 20; first electrode 01; light-emitting layer 02; organic light-emitting layer EML; second electrode 03; isolation component 30; first accommodating portion 40; pixel barrier wall 21; second accommodating portion 50; first sub-light-emitting layer 021; second sub-light-emitting layer 022; charge generation layer 04; hole injection layer HIL; hole transport layer HTL; electron blocking layer EBL; hole blocking layer HBL; electron transport layer ETL; electron injection layer EIL; first organic common layer 04; second organic common layer 05. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the following will be combined with the accompanying drawings of the embodiments of the present disclosure to make a clear and complete description of the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The components of the embodiments of the present disclosure generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed present disclosure, but only represents selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present disclosure.

[0029] Unless otherwise defined, technical terms or scientific terms used in the present disclosure should be understood as having the common meaning in the art of the present disclosure. The terms "first", "second" and similar terms used in the present disclosure do not represent any order, number or importance, but are only used to distinguish different components. Similarly, the terms "one", "an" or "the" and similar terms do not represent a quantity limitation, but represent the existence of at least one. The terms "include" or "contain" and similar terms mean that the elements or objects before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0030] In the present disclosure, "a plurality of or several" refers to two or more. The term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0031] The inventors found that in the prior art, when the film layers of the OLED device are manufactured, the organic light-emitting layer is usually an integral surface evaporation as a continuous film layer, so the organic light-emitting layer corresponding to the adjacent sub-pixel area is connected, and due to the demand for higher PPI, the anode gap is only a few microns, so that light leakage and cross talk often occur between adjacent sub-pixels. Especially for Tandem OLED, the cross talk problem is more serious.

[0032] In view of this, the display substrate provided by the embodiments of the present disclosure includes: a substrate 10; a pixel definition layer 20 disposed on the substrate 10 and having a first accommodating portion 40; a plurality of light emitting devices, each of the plurality of light emitting devices including a first electrode 01, a light emitting layer 02, and a second electrode 03, the first electrode 01 being located on a side of the pixel definition layer 20 close to the substrate 10, and the first accommodating portion 40 of the pixel definition layer 20 exposing the first electrode 01, the light emitting layer 02 covering at least the first accommodating portion 40, and the second electrode 03 being located on a side of the light emitting layer 02 away from the substrate 10; and an isolation component 30 disposed between adjacent light emitting devices, the isolation component 30 being configured to block charges transmitted between the light emitting devices.

[0033] In the display substrate provided by the embodiments of the present disclosure, the isolation component 30 is disposed between adjacent light emitting devices, and the isolation component 30 is configured to block charges transmitted between the light emitting devices, thereby weakening the crosstalk phenomenon inside the light emitting devices and between the light emitting devices, while not affecting the normal charge transmission in the longitudinal direction of the light emitting devices, and ensuring the normal display of the light emitting devices. The display substrate provided by the embodiments of the present disclosure achieves the improvement of the crosstalk of the light emitting devices by the above-mentioned arrangement of the isolation component 30 in a non-contact manner, so that the display substrate using the light emitting device has obvious competitive advantages and great application potential.

[0034] The display substrate provided by the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0035] Specifically, Figure 1 A structural schematic diagram of the display substrate provided by the embodiments of the present disclosure is shown in FIG. 1. Figure 1As shown, the substrate 10 in the embodiment of the present disclosure can be a flexible substrate, so that the display substrate is applied to flexible display; the pixel defining layer 20 is arranged on the substrate 10, and has a first accommodating portion 40, the pixel defining layer 20 is actually used to define a plurality of arrayed pixel regions (not shown in the figure) on the substrate 10; each of the plurality of light emitting devices comprises a first electrode 01, a light emitting layer 02 and a second electrode 03; wherein the first electrode 01 is an anode, and is located on the side of the pixel defining layer 20 close to the substrate 10, and the first accommodating portion 40 of the pixel defining layer 20 exposes the first electrode 01, the light emitting layer 02 covers at least the first accommodating portion 40, and the second electrode 03 is a cathode, and is located on the side of the light emitting layer 02 away from the substrate 10, in order to facilitate description and understanding, the following embodiments of the present disclosure are described by taking the first electrode 01 as an anode and the second electrode 03 as a cathode as an example; the isolation component 30 is arranged between the adjacent light emitting devices, and the isolation component 30 is configured to block the charges transmitted between the light emitting devices; wherein the isolation component 30 plays a role in blocking the horizontal charge transport when the charges are transported horizontally in the light emitting device and between the adjacent light emitting devices, so as to effectively weaken the crosstalk phenomenon, and thus better display effect is obtained.

[0036] Specifically, when the substrate 10 is a flexible substrate, the material thereof includes but is not limited to polyimide (PI), and the material of the substrate 10 can also be a glass substrate; the material of the first electrode 01 includes but is not limited to indium tin oxide (ITO) and FTO conductive glass; the material of the pixel defining layer 20 includes but is not limited to PI glue; the material used by the light emitting layer 02 includes but is not limited to rhodamine dye, coumarin dye, N-aromatic benzimidazole, 8-hydroxyquinoline aluminum (Alq3) and 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD).

[0037] It should be noted that the fabrication of the display substrate requires a vapor deposition process, which in turn requires a metal mask. The metal mask is etched with specific shapes and positions to deposit the vapor-deposited organic material onto the substrate 10. This embodiment primarily describes a metal mask, made of metal as the base material, used in the fabrication process. This mask covers the substrate 10 to ensure that the vapor-deposited material is deposited at designated locations. Shadow masks are divided into two categories: one is a fine metal mask (FMM), which is mainly used for evaporating the light-emitting layer 02, that is, for differentially evaporating the light-emitting material of RGB sub-pixels. The fineness of its structure directly determines the pixel density; the other is a common metal mask (CMM), which is mainly used for evaporating the common layer. In this embodiment, the laterally transported charge inside the light-emitting device and between adjacent light-emitting devices refers to the laterally transported charge in the common layer evaporated by CMM. The common layer includes at least an electron transport layer (ETL) and a hole transport layer (HTL), which will not be described in detail later.

[0038] In some embodiments, Figure 2 This is a schematic diagram of another display substrate structure provided in an embodiment of the present disclosure, as shown below. Figure 2 As shown, the light-emitting device of the display substrate further includes a first organic common layer 04 and a second organic common layer 05. The first organic common layer 04 may include an electron injection layer EIL and an electron transport layer ETL, and the second organic common layer 05 may include a hole injection layer HIL and a hole transport layer HTL. The first organic common layer 04 is located on the side of the light-emitting layer 02 near the first electrode 01, and the projection of the first organic common layer 04 on the substrate 10 covers the projection of the pixel limiting layer 20 on the substrate 10. The second organic common layer 05 is located on the side of the light-emitting layer 02 near the second electrode 03, and the projection of the second organic common layer 05 on the substrate 10 covers the projection of the pixel limiting layer 20 on the substrate 10.

[0039] It is understood that in the embodiments of this disclosure, the light-emitting device may only include a first organic common layer 04 or a second organic common layer 05, and the first organic common layer 04 may further include an electron blocking layer EBL, and the second organic common layer 05 may further include a hole blocking layer HBL. This disclosure does not limit the scope of the light-emitting device. This further configuration of the light-emitting device structure is beneficial for the generation, separation, injection, and transport of charge, thereby improving the light-emitting performance of the light-emitting device. In the subsequent isolation component 30, the blockade of charge transfer between adjacent light-emitting devices can be better achieved.

[0040] In some embodiments, Figure 3aA schematic diagram of charge motion when crosstalk occurs in an embodiment of the present disclosure; Figure 3b A schematic diagram of another charge motion when crosstalk occurs in an embodiment of the present disclosure, as shown in Figure 3a and 3b The pixel confinement layer 20 also has a pixel barrier 21 defining a first accommodating portion 40; the pixel barrier 21 is doped with a magnetic material and is multiplexed as the isolation component 30. In an embodiment of the present disclosure, by doping the pixel barrier 21 with a magnetic material, when there is a charge with lateral transport inside the light-emitting device and between the adjacent light-emitting devices, the effect of blocking the lateral charge transport is achieved, thereby effectively weakening the crosstalk phenomenon and further obtaining a better display effect.

[0041] Specifically, Figure 4a A schematic diagram of blocking the lateral charge transport in an embodiment of the present disclosure; Figure 4b A schematic diagram of another principle of blocking the lateral charge transport in an embodiment of the present disclosure, as shown in Figure 3a , 3b , 4a and 4b, taking a negatively charged electron as an example, when crosstalk occurs, the light-emitting device will generate a charge with lateral transport, and in an embodiment of the present disclosure, the pixel barrier 21 is doped with a magnetic material, thereby generating a ring-shaped magnetic field, which makes the charge with lateral transport subjected to the Lorentz force under the ring-shaped magnetic field, thereby changing the motion direction of the charge with lateral transport, and further achieving the effect of blocking the charge with lateral transport.

[0042] It should be noted that the charge with lateral transport is either inside the light-emitting device or between the adjacent light-emitting devices, that is, the charge with lateral transport is either moving out of the light-emitting device or not, and the display substrate in an embodiment of the present disclosure can achieve the effect of blocking the charge with lateral transport.

[0043] For ease of description and understanding, an embodiment of the present disclosure is described in detail taking a negatively charged electron as an example. As shown in Figure 4a , taking the X-axis direction of the diagram as the first direction and the Y-axis direction as the second direction, the first direction and the second direction are perpendicular, when the electron enters the ring-shaped magnetic field generated by the magnetic material doped in the pixel confinement layer 20 along the first direction, the magnetic field direction shown in Figure 4a is taken as an example, according to the left-hand rule, it can be judged that the negatively charged electron is subjected to the Lorentz force opposite to the second direction after entering the magnetic field, thereby changing the original motion direction along the first direction; similarly, as shown in Figure 4b , taking the X-axis direction of the diagram as the first direction and the Y-axis direction as the second direction, the first direction and the second direction are perpendicular, when the electron enters the ring-shaped magnetic field generated by the magnetic material doped in the pixel confinement layer 20 along the first direction, the magnetic field direction shown in Figure 4bThe magnetic field direction shown is perpendicular to the paper and outward, according to the left-hand rule, it can be judged that the negatively charged electrons will be subjected to the same Lorentz force as the second direction after entering the magnetic field, thereby changing the original movement direction along the first direction. In the embodiment of the present disclosure, the pixel barrier 21 is doped with a magnetic material, which can block the lateral transport of charges when crosstalk occurs, so that the laterally transported electrons cannot excite the adjacent light emitting device to emit light, and finally weaken the crosstalk of the device.

[0044] In some embodiments, the magnetic material is a ferrite material.

[0045] It should be noted that the magnetic material in the embodiment of the present disclosure includes but is not limited to a ferrite material, as long as it can generate a magnetic field that changes the direction of the lateral transport of charges without affecting the vertical migration of charges in the light emitting device.

[0046] In some embodiments, Figure 5 Another structure schematic diagram of a display substrate provided by the embodiment of the present disclosure is shown in FIG. 4. Figure 5 As shown, the pixel defining layer 20 also has a second accommodating portion 50 between the adjacent first accommodating portions 40, and the isolation component 30 is arranged in the second accommodating portion 50. When the isolation component 30 has lateral transport of charges inside the light emitting device and between adjacent light emitting devices, it plays a role in blocking the lateral transport of charges, thereby effectively reducing the crosstalk phenomenon and further obtaining better display effect.

[0047] In some embodiments, the second accommodating portion 50 penetrates the pixel defining layer 20 along the thickness direction perpendicular to the substrate 10. It can be understood that when the second accommodating portion 50 penetrates the pixel defining layer 20 along the thickness direction perpendicular to the substrate 10, the second accommodating portion 50 is actually formed at the position of the pixel defining layer 20, and the isolation component 30 is arranged therein to play a role in blocking the lateral transport of charges when the isolation component 30 has lateral transport of charges inside the light emitting device and between adjacent light emitting devices.

[0048] In some embodiments, the material of the isolation component 30 is a chelating resin or a nanomaterial, and at this time the pixel barrier 21 is not reused as the isolation component 30. In the embodiment of the present disclosure, by selecting a material with adsorption capacity, the lateral transport of charges can be adsorbed or neutralized, thereby improving the crosstalk problem of the light emitting device in the lateral direction, and further improving the OLED lighting quality and color gamut.

[0049] The chelating resin is a high polymer material with excellent adsorption capacity and is formed by a central coordination substance and a multi-ligand with chelating function. Specifically, the chelating resin contains chelating functional groups capable of adsorbing charges, and can be adsorbed or reacted with positive charges or negative charges according to different ligands, thereby blocking the lateral transport of charges. The functional groups contain atoms such as N, O, S, P, and As with unpaired electrons, and specific functional groups can adsorb specific charges. For example, the N, O, and S functional groups can form a coordination bond with the positive charges in the environment through their unpaired electrons, thereby neutralizing or adsorbing the surrounding positive charges. Similarly, the chelating groups containing P functional groups can neutralize or adsorb negative charges in the environment to form a coordination bond. In the embodiment of the present disclosure, the isolation component 30 is arranged in the second accommodating portion 50 between the first accommodating portions 40 of the light-emitting device, and the material of the isolation component 30 is selected as the chelating resin, which can neutralize or adsorb the lateral transport of charges, that is, block the lateral transport of charges, solve the crosstalk problem caused by the lateral transport of charges, and improve the picture quality and color gamut. Figure 6 For the light spectrum analysis comparison chart before and after crosstalk improvement in the embodiment of the present disclosure, as shown in FIG. 2, the light spectrum intensity is normalized, wherein the abscissa represents the wavelength of visible light (unit: nanometer nm), and the ordinate represents the intensity (arbitrary unit, abbreviated as a.u.). Curve a in the figure represents the spectrum curve before crosstalk improvement, and curve b represents the spectrum curve after crosstalk improvement. It can be seen that the crosstalk problem can be obviously improved by arranging the isolation component 30 and using the chelating resin as the material of the isolation component 30 in the embodiment of the present disclosure. Figure 6

[0050] In the embodiment of the present disclosure, the chelating resin can be prepared by processes including but not limited to inkjet printing and coating, and the chelating resin can be further cured by ultraviolet (UV) curing glue after preparation.

[0051] It should be noted that the material of the isolation component 30 in the embodiment of the present disclosure is not limited to the chelating resin and the nanomaterial, as long as it can block the lateral transport of charges in the light-emitting device, and the present disclosure does not limit this.

[0052] In some embodiments, the nanomaterial is an organic nanomaterial containing one or more functional groups of NO2, CN, F, Cl, Br, and I.

[0053] ​Specifically, the nanomaterial is used as the material of the isolation component 30 in the embodiments of the present disclosure because the nanomaterial has a large chemical activity and a large surface area, can be more easily combined with external substances, and has a strong adsorption capacity. The organic nanomaterial also has functions such as electricity and light absorption. Based on the above advantages of the organic nanomaterial, the organic nanomaterial can be applied to a light-emitting device to block the lateral transport of charges, thereby improving the crosstalk problem. The organic nanomaterial can contain one or more of functional groups such as NO2, CN, F, Cl, Br, and I, but is not limited to the above functional groups, as long as the organic nanomaterial can absorb the charges that are laterally transported in the light-emitting device and between adjacent light-emitting devices.

[0054] In some embodiments, the nanomaterial is an inorganic nanomaterial containing one or more metal oxides such as nanometer titanium dioxide and nanometer vanadium pentoxide.

[0055] Specifically, the inorganic nanomaterial can contain one or more metal oxides such as nanometer titanium dioxide and nanometer vanadium pentoxide, but is not limited to the above metal oxides, as long as the inorganic nanomaterial can absorb the charges that are laterally transported in the light-emitting device and between adjacent light-emitting devices.

[0056] In the embodiments of the present disclosure, the nanomaterial can be prepared by processes including but not limited to inkjet printing and coating.

[0057] In some embodiments, the light-emitting device further includes, in sequence from the first electrode 01 to the second electrode 03, a hole injection layer HIL, a hole transport layer HTL, and an electron blocking layer EBL between the first electrode 01 and the light-emitting layer 02; and the light-emitting device further includes, in sequence from the first electrode 01 to the second electrode 03, a hole blocking layer HBL, an electron transport layer ETL, and an electron injection layer EIL between the light-emitting layer 02 and the second electrode 03. The structure of the light-emitting device in the embodiments of the present disclosure is beneficial to the generation, separation, injection, and transport of charges, thereby improving the light-emitting performance of the light-emitting device.

[0058] Specifically, Figure 7 The film layer structure of the light-emitting device in the embodiments of the present disclosure is shown in FIG. 1. Figure 7As shown, the light-emitting device includes a first electrode 01, a second electrode 03, and a light-emitting layer 02 located between the first electrode 01 and the second electrode 03, and a hole injection layer HIL, a hole transport layer HTL, and an electron blocking layer EBL arranged in sequence in the direction from the first electrode 01 to the second electrode 03 between the first electrode 01 and the light-emitting layer 02, and a hole blocking layer HBL, an electron transport layer ETL, and an electron injection layer EIL arranged in sequence in the direction from the first electrode 01 to the second electrode 03 between the light-emitting layer 02 and the second electrode 03; wherein the hole injection layer HIL injects holes generated by the first electrode 01 into the hole transport layer HTL, the hole transport layer HTL transports holes to the electron blocking layer EBL, the electron blocking layer EBL is configured to block electrons and transport the received holes to the light-emitting layer 02, the electron injection layer EIL injects electrons generated by the second electrode 03 into the electron transport layer ETL, the electron transport layer ETL transports electrons to the hole blocking layer HBL, the hole blocking layer HBL is configured to block holes and transport the received electrons to the light-emitting layer 02, and in the light-emitting layer 02, electrons and holes recombine to form excitons, thereby emitting light.

[0059] In some embodiments, the light-emitting layer 02 of the light-emitting device has a plurality of sub-light-emitting layers, and a charge separation generation layer connecting adjacent sub-light-emitting layers.

[0060] Specifically, Figure 8 Another structure of a display substrate provided by the present disclosure is shown in the following schematic diagram: Figure 8 As shown, the light-emitting device has two sub-light-emitting layers, namely a first sub-light-emitting layer 021 and a second sub-light-emitting layer 022, and also has a charge generation layer 04 between the first sub-light-emitting layer 021 and the second sub-light-emitting layer 022, which is used to generate electrons and holes. Of course, it can be understood that only two sub-light-emitting layers are shown here for ease of description and understanding, and the light-emitting device can also contain more than two sub-light-emitting layers. The present disclosure further optimizes the structure of the light-emitting device by arranging the light-emitting layer 02 to have a plurality of sub-light-emitting layers, and connecting adjacent sub-light-emitting layers through a charge separation generation layer, so that the light-emitting device has higher light-emitting brightness, current efficiency, and service life compared to a light-emitting device having only one light-emitting layer 02, and the light-emitting brightness and current efficiency increase exponentially with the increase in the number of series-connected sub-light-emitting layers. At the same time, due to the isolation component 30 arranged in the present disclosure, the charges transported laterally in the light-emitting device can be absorbed, thereby further improving the display performance of the light-emitting device, and preventing the cross voltage of the light-emitting device from rising, so that the display effect of the light-emitting device when applied to a display panel, such as light-emitting brightness, color, etc. can be better optimized.

[0061] It should be noted that the sub-emitting layer mentioned in the embodiments of the present disclosure at least includes an organic emitting layer EML, and the organic emitting layer EML is evaporated by FMM, and the sub-emitting layer can further include one or more of a hole injection layer HIL, a hole transport layer HTL and an electron blocking layer EBL; and the film layer other than the organic emitting layer EML is evaporated by CMM, which is collectively referred to as a CMM film layer here; wherein the CMM film layer includes a hole transport layer HTL, a charge generation layer 04, an electron transport layer ETL, a cathode and the like film layer other than the organic emitting layer EML. The charge blocked in the embodiments of the present disclosure is mainly the charge in the CMM film layer, that is, the embodiments of the present disclosure mainly weaken the lateral migration ability of the charge in the CMM film layer.

[0062] When the CMM film layer has a laterally transported charge, the laterally transported charge will migrate to the adjacent light emitting device, causing the phenomenon of crosstalk between light emitting devices, thereby affecting the surrounding light emitting devices that are not lit, and ultimately leading to display abnormalities. As shown in the Figure 7 The embodiments of the present disclosure set the isolation assembly 30 in the second accommodating portion 50 between the first accommodating portions 40 arranged adjacently, and further block the laterally transported charge in the light emitting device by selecting the material of the isolation assembly 30, so as to realize the normal display of the light emitting device. The design of the isolation assembly 30 in the embodiments of the present disclosure does not need to increase the contact assembly, and compared with the common isolation column scheme, it also does not bring the problem of cross pressure rise of the light emitting device, and has more excellent display effect.

[0063] In some embodiments, after the first electrode 01 is prepared, the ion exchange resin or adsorption material can be prepared by inkjet printing or blade coating to neutralize or adsorb the laterally transported charge in the CMM film layer, thereby reducing the phenomenon of lateral crosstalk between light emitting devices.

[0064] In some embodiments, the charge separation generation layer (not shown in the figure) includes a first charge transport layer, a charge generation layer 04 and a second charge transport layer arranged in sequence in the direction of the first electrode 01 pointing to the second electrode 03.

[0065] Specifically, the first charge transport layer in the embodiments of the present disclosure can be an electron transport layer ETL, and the second charge transport layer can be a hole transport layer HTL. By further providing the charge separation generation layer, the embodiments of the present disclosure are conducive to the generation, separation, injection and transport of charges, thereby further improving the performance of the Tandem OLED. In the structure of the Tandem OLED, the charge generation layer 04 interposed between the first sub-light-emitting layer 021 and the second sub-light-emitting layer 022 is generally used to generate electrons and holes. After the electrons and holes are separated, the electrons are transported to and injected into the first sub-light-emitting layer 021, and the holes are transported to and injected into the second sub-light-emitting layer 022. Then, the holes generated at the first electrode 01 (anode) recombine at the first sub-light-emitting layer 021, thereby emitting light. The electrons generated at the second electrode 03 (cathode) recombine at the second sub-light-emitting layer 022, thereby emitting light.

[0066] In some embodiments, the distance between the surface of the substrate substrate 10 and the isolation component 30 away from the substrate substrate 10 is a first distance, and the distance between the surface of the substrate substrate 10 and the light-emitting layer 02 is a second distance. The first distance is not greater than the second distance.

[0067] Specifically, when the light-emitting device in the embodiments of the present disclosure is a non-stacked light-emitting device, the distance between the surface of the substrate substrate 10 and the isolation component 30 away from the substrate substrate 10 is a first distance, and the distance between the surface of the substrate substrate 10 and the light-emitting layer 02 is a second distance. The first distance is not greater than the second distance. Such a setting can make the isolation component 30 play a better role in blocking the laterally transported charges.

[0068] Further, in some embodiments, when the light-emitting layer 02 has a plurality of sub-light-emitting layers, i.e., the light-emitting device is a stacked light-emitting device, the distance between the surface of the substrate substrate 10 and the isolation component 30 away from the substrate substrate 10 is a first distance, and the distance between the surface of the substrate substrate 10 and the first sub-light-emitting layer in the plurality of sub-light-emitting layers in the light-emitting layer 02 along the direction from the first electrode to the second electrode is a second distance. The first distance is not greater than the second distance. Such a setting can improve the display performance of the light-emitting device while making the isolation component 30 play a better role in blocking the laterally transported charges.

[0069] In a second aspect, the embodiments of the present disclosure also provide a display panel, which includes the display substrate in any of the above embodiments. The display panel provided by the embodiments of the present disclosure can be applied to electronic devices, which can be wearable devices such as watches. Of course, it can also be any product or component with display function, such as mobile phones, tablet computers, televisions, displays, notebook computers, digital photo frames, navigation devices, vehicle-mounted displays, VR displays, AR displays, etc.

[0070] It is understood that the above embodiments are only exemplary for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display substrate, characterized by, The display substrate comprises: a substrate substrate; a pixel definition layer disposed on the substrate substrate; the pixel definition layer has a pixel barrier wall defining a first accommodating portion; a plurality of light emitting devices, each of the plurality of light emitting devices comprising a first electrode, a light emitting layer, and a second electrode, the first electrode being located on a side of the pixel definition layer close to the substrate substrate, and the first accommodating portion of the pixel definition layer exposing the first electrode, the light emitting layer covering at least the first accommodating portion, and the second electrode being located on a side of the light emitting layer away from the substrate substrate; and an isolation component disposed between the light emitting devices arranged adjacently, the isolation component being configured to block the charge transmitted between the light emitting devices; the pixel barrier wall is doped with a magnetic material and is multiplexed as the isolation component.

2. The display substrate of claim 1, wherein, The magnetic material is a ferrite material.

3. The display substrate of claim 1, wherein, The pixel definition layer further has a second accommodating portion between the first accommodating portions arranged adjacently, and the isolation component is disposed in the second accommodating portion.

4. The display substrate of claim 3, wherein, The second accommodating portion penetrates the pixel definition layer along a thickness direction perpendicular to the substrate substrate. 5.The display substrate of claim 3, wherein, The material of the isolation component is a chelating resin or a nanomaterial. 6.The display substrate of claim 5, wherein, The nanomaterial is an organic nanomaterial containing one or more functional groups of NO2, CN, F, Cl, Br, and I. 7.The display substrate of claim 5, wherein, The nanomaterial is an inorganic nanomaterial containing one or more metal oxides of nanometer titanium dioxide and nanometer vanadium pentoxide.

8. The display substrate according to any one of claims 1-7, wherein, The light emitting device further comprises, between the first electrode and the light emitting layer of the light emitting device, a hole injection layer, a hole transport layer, and an electron blocking layer arranged in sequence in a direction in which the first electrode points to the second electrode; and further comprises, between the light emitting layer and the second electrode of the light emitting device, a hole blocking layer, an electron transport layer, and an electron injection layer arranged in sequence in a direction in which the first electrode points to the second electrode.

9. The display substrate according to any one of claims 1-7, wherein, The light emitting layer of the light emitting device has a plurality of sub-light emitting layers, and a charge separation generation layer connecting the sub-light emitting layers arranged adjacently. 10.The display substrate of claim 9, wherein, The charge separation generation layer comprises a first charge transport layer, a charge generation layer, and a second charge transport layer arranged in sequence in a direction in which the first electrode points to the second electrode. 11.The display substrate according to any one of claims 1-7, wherein, The distance between the surface of the isolation component away from the substrate substrate and the substrate substrate is a first distance, and the distance between the surface of the light emitting layer close to the substrate substrate and the substrate substrate is a second distance, and the first distance is not greater than the second distance.

12. A display panel, characterized by The display substrate comprises any one of claims 1-11. The display substrate comprises any one of claims 1-11.

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