Display panel and electronic equipment

Abstract

The embodiment of the utility model provides a display panel and electronic equipment, relates to the technical field of display, and is used for improving the pixel density of the display panel. The display panel comprises a substrate and a light emitting unit arranged on the substrate. The light-emitting unit comprises a first electrode, a first light-emitting part, a second electrode, a second light-emitting part and a third electrode which are sequentially arranged in a stacked mode in the thickness direction of the display panel and in the direction away from the substrate, and the first light-emitting part and the second light-emitting part are different in light-emitting color. Wherein in the same light-emitting unit, at least two electrodes of the first electrode, the second electrode and the third electrode are independently arranged in the electrode layers where the at least two electrodes are located. The first light emitting portion and the second light emitting portion are configured to emit light independently. The display panel is used for displaying images.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more particularly to a display panel and an electronic device. Background Technology

[0002] OLED (Organic Light Emitting Diode) has been widely used in the display field due to its advantages such as self-emission, low driving voltage, high luminous efficiency, fast response speed, and flexible display capability.

[0003] Improving the PPI (Pixels Per Inch, a unit representing the number of pixels per inch) of OLED display panels to enhance their display quality is one of the research directions for those skilled in the art. Utility Model Content

[0004] The purpose of this disclosure is to provide a display panel and an electronic device for improving the pixel density of the display panel.

[0005] To achieve the above objectives, the embodiments of this disclosure provide the following technical solutions:

[0006] On one hand, a display panel is provided. The display panel includes a substrate and a light-emitting unit disposed on the substrate. The light-emitting unit includes a first electrode, a first light-emitting portion, a second electrode, a second light-emitting portion, and a third electrode, which are sequentially stacked along the thickness direction of the display panel and away from the substrate, wherein the first light-emitting portion and the second light-emitting portion emit different colors.

[0007] In the same light-emitting unit, at least two of the first, second, and third electrodes are independently disposed in their respective electrode layers. The first and second light-emitting parts are configured to emit light independently.

[0008] In the aforementioned display panel, the first light-emitting unit can emit light of a first color, and the second light-emitting unit can emit light of a second color. Therefore, when the first light-emitting unit is driven to emit light alone, the light-emitting unit can emit light of the first color; when the second light-emitting unit is driven to emit light alone, the light-emitting unit can emit light of the second color; and when both the first and second light-emitting units are driven to emit light simultaneously, the light-emitting unit can emit light of a third color, which is obtained by mixing the first and second color lights. That is, each light-emitting unit in the display panel can emit three different colors of light.

[0009] Thus, with the same display panel size, compared to each light-emitting unit in the display panel emitting only one color of light, the pixel density in the display panel of this embodiment can be significantly improved, thereby improving the display quality of the display panel and making the displayed image clearer and more detailed.

[0010] In some embodiments, the display panel further includes a pixel defining layer and a first electrode layer disposed on a substrate. The pixel defining layer includes a first opening and a second opening spaced apart from each other, a first light-emitting portion being located at least within the first opening, and the second opening being located beside the first opening. The first electrode layer includes a first electrode and a first transition portion disposed at intervals, the first electrode being disposed within the first opening, and the first transition portion being disposed within the second opening and connected to the second electrode.

[0011] In some embodiments, the edge of the first light-emitting portion extends into the second opening. The second opening includes a first sidewall and a second sidewall, the first sidewall being closer to the first opening than the second sidewall, a first gap being between the edge of the first light-emitting portion and the second sidewall, the first gap exposing at least a portion of the surface of the first adapter portion, and the edge of the second electrode extending into the first gap and contacting the first adapter portion.

[0012] In some embodiments, the display panel further includes a first conductive pattern disposed between a first electrode layer and a substrate, the first conductive pattern being connected to a first transition portion. The first conductive pattern is configured to transmit a second voltage signal to a second electrode.

[0013] In some embodiments, the display panel further includes: a planarization layer disposed between the first conductive pattern and the first electrode layer, the planarization layer having a first adapter hole located below the second opening, and a first adapter portion passing through the first adapter hole and connected to the first conductive pattern.

[0014] In some embodiments, a plurality of second openings are provided circumferentially around the first opening.

[0015] In some embodiments, the second opening extends circumferentially along the first opening.

[0016] In some embodiments, the second opening surrounds the first opening.

[0017] In some embodiments, the pixel defining layer further includes a third opening located beside the first opening. The first electrode layer further includes a second adapter portion disposed within the third opening and connected to the third electrode.

[0018] In some embodiments, the display panel includes a plurality of light-emitting units, the first electrode layer includes a plurality of second transition portions, and the third electrodes of the plurality of light-emitting units are interconnected through the plurality of second transition portions.

[0019] In some embodiments, the display panel further includes an isolation structure, which includes a first isolation portion and a second isolation portion; the first isolation portion is disposed on the side of the pixel defining layer away from the substrate, and the second isolation portion is disposed on the side of the first isolation portion away from the substrate.

[0020] The isolation structure includes a fourth opening, the edge of the second isolation portion protruding from the inner wall of the first isolation portion, and the first electrode, the first light-emitting portion, the second electrode, and the second light-emitting portion all located within the area of ​​the fourth opening. The first isolation portion is made of a conductive material, the third electrode is connected to the first isolation portion, and the first isolation portion is connected to the second transition portion.

[0021] In some embodiments, the display panel includes a plurality of light-emitting units, and the third electrodes of the plurality of light-emitting units are interconnected through a first isolation portion and a second transition portion.

[0022] In some embodiments, the first isolation portion includes a first part and a second part connected together, the first part being located above the pixel defining layer and the second part being located within the range of the third opening. The third electrode contacts the sidewall of the first part, and the second part contacts the second transition portion.

[0023] In some embodiments, a second portion of the first isolation portion contacts the second transition portion away from the substrate.

[0024] In some embodiments, a second portion of the first isolation portion extends along the sidewall of the third opening and contacts the sidewall of the second transition portion.

[0025] In some embodiments, the distance from the upper surface of the third electrode to the substrate is less than the distance from the upper surface of the isolation structure to the substrate, and the distance between the upper surface of the third electrode and the upper surface of the isolation structure is greater than a first threshold. The edge of the third electrode is connected to the first isolation portion.

[0026] In some embodiments, the distance between the upper surface of the third electrode and the upper surface of the isolation structure is less than or equal to a first threshold; the third electrodes of multiple light-emitting units are interconnected to form an integral structure.

[0027] In some embodiments, the display panel further includes a voltage signal line disposed between the first electrode layer and the substrate, the voltage signal line being connected to a second adapter. The voltage signal line is configured to transmit a third voltage signal to the third electrode.

[0028] In some embodiments, the display panel further includes: a planarization layer disposed between the voltage signal line and the first electrode layer, the planarization layer having a second adapter hole located below the third opening, and a second adapter portion passing through the second adapter hole to connect to the second pixel circuit.

[0029] In some embodiments, the display panel includes multiple isolation structures, each isolation structure corresponding to a light-emitting unit. In the multiple isolation structures, adjacent isolation structures are spaced apart; alternatively, the multiple isolation structures are connected to each other to form a single integrated structure.

[0030] In some embodiments, a plurality of third openings are provided circumferentially around the first opening.

[0031] In some embodiments, the third opening extends circumferentially along the first opening.

[0032] In some embodiments, the third opening surrounds the first opening.

[0033] In some embodiments, the pixel defining layer includes a plurality of third openings that are interconnected to form a mesh.

[0034] In some embodiments, the light absorption rate of the pixel delimiting layer is greater than or equal to 90%.

[0035] In some embodiments, along the thickness direction of the display panel, the upper surface of the pixel defining layer is located between the upper surface of the second electrode and the lower surface of the second electrode.

[0036] In some embodiments, the display panel further includes: a second conductive pattern disposed between a substrate and a first electrode layer, the second conductive pattern being connected to the first electrode; the second conductive pattern being configured to transmit a first voltage signal to the first electrode.

[0037] In some embodiments, the display panel further includes a planarization layer disposed between the second conductive pattern and the first electrode layer, the planarization layer having a third transition hole located below the first opening, and the first electrode passing through the third transition hole to connect with the second conductive pattern.

[0038] In some embodiments, the display panel includes a pixel circuit disposed between a substrate and a first electrode layer, wherein the first electrode and the second electrode in the same light-emitting unit are both connected to the same pixel circuit; the pixel circuit is configured to transmit a first voltage signal to the first electrode and a second voltage signal to the second electrode in a time-division manner.

[0039] In some embodiments, the wavelength of the emitted color of either the first light-emitting part or the second light-emitting part is outside the absorption spectrum range of the other light-emitting part.

[0040] In some embodiments, the light-emitting area of ​​the first light-emitting part and the light-emitting area of ​​the second light-emitting part are the same; or, the difference between the light-emitting area of ​​the first light-emitting part and the light-emitting area of ​​the second light-emitting part is less than or equal to 2% of the light-emitting area of ​​either the first light-emitting part or the second light-emitting part.

[0041] In some embodiments, the second electrode is a transparent electrode or a semi-transparent and semi-reflective electrode, and the third electrode is a transparent electrode or a semi-transparent and semi-reflective electrode.

[0042] In some embodiments, the light-emitting unit includes a first light-emitting unit and a second light-emitting unit, wherein the second light-emitting part of the first light-emitting unit and the second light-emitting part of the second light-emitting unit are both first color light-emitting parts, the first light-emitting part of the first light-emitting unit is a second color light-emitting part, and the first light-emitting part of the second light-emitting unit is a third color light-emitting part.

[0043] In some embodiments, the second light-emitting part of the first light-emitting unit and the second light-emitting part of the second light-emitting unit are blue light-emitting parts, the first light-emitting part of the first light-emitting unit is red light-emitting part, and the second light-emitting part of the second light-emitting unit is green light-emitting part.

[0044] In some embodiments, the sheet resistance of the second electrode of the first light-emitting unit is less than the sheet resistance of the second electrode of the second light-emitting unit; and / or, the work function of the material of the second electrode of the first light-emitting unit is greater than the work function of the material of the second electrode of the second light-emitting unit.

[0045] In some embodiments, in the light-emitting unit, the distance between two electrodes adjacent to the blue light-emitting part is 1850 Å, the distance between two electrodes adjacent to the green light-emitting part is 2400 Å, and the distance between two electrodes adjacent to the red light-emitting part is 2900 Å.

[0046] In some embodiments, the sheet resistance of the material of the second electrode is less than or equal to 10 Ω / cm. 2 ; and / or, the work function of the material of the second electrode is in the range of 3eV to 5eV.

[0047] In some embodiments, the material of the second electrode includes one of a transparent oxide, a metallic element, or a metallic compound.

[0048] In some embodiments, the display panel further includes: an inorganic encapsulation layer disposed on the side of the insulating structure away from the substrate, the inorganic encapsulation layer including a plurality of inorganic encapsulation portions, the plurality of inorganic encapsulation portions being interconnected to form an integral structure, and at least a portion of each inorganic encapsulation portion being located within a fourth opening and covering a third electrode.

[0049] In some embodiments, the display panel further includes an inorganic encapsulation layer disposed on the side of the insulating structure away from the substrate, the inorganic encapsulation layer including a plurality of inorganic encapsulation portions spaced apart from each other, and at least a portion of each inorganic encapsulation portion being located within a fourth opening and covering a third electrode.

[0050] In some embodiments, the display panel further includes: a fourth conductive pattern disposed on the side of the isolation structure away from the substrate, and an auxiliary electrode disposed in the fourth opening, wherein the fourth conductive pattern and the third electrode are formed in the same film layer, and the auxiliary electrode covers a portion of the sidewall of the fourth opening and is connected to the third electrode.

[0051] In some embodiments, when the first light-emitting part and the second light-emitting part are configured to emit light with the same luminous intensity, the driving voltage of the first light-emitting part is the same as the driving voltage of the second light-emitting part; or, the difference between the driving voltage of the first light-emitting part and the driving voltage of the second light-emitting part is less than or equal to 10% of the driving voltage of one of the first light-emitting parts and the second light-emitting part.

[0052] In some embodiments, the pixel density of the display panel is greater than or equal to 1500ppi.

[0053] On the other hand, an electronic device is provided. The electronic device includes: a driving circuit, and a display panel as described in any of the above embodiments, wherein the driving circuit is connected to the display panel.

[0054] The above-described electronic device has the same structure and beneficial technical effects as the display panel provided in some of the above embodiments, and will not be described again here. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0056] Figure 1 This is a plan view of an electronic device according to some embodiments;

[0057] Figure 2 This is a structural diagram of a display panel according to some embodiments;

[0058] Figure 3 This is a structural diagram of a display panel according to some other embodiments;

[0059] Figure 4 This is a structural diagram of a display panel according to some other embodiments;

[0060] Figure 5 for Figure 4 A magnified view of a portion of the structure;

[0061] Figure 6This is a planar structural diagram of the pixel delimiting layer according to some embodiments;

[0062] Figure 7 This is a planar structural diagram of the pixel delimiting layer according to some other embodiments;

[0063] Figure 8 This is a planar structural diagram of the pixel delimiting layer according to some other embodiments;

[0064] Figure 9 This is a planar structural diagram of the pixel delimiting layer according to some other embodiments;

[0065] Figure 10 This is a planar structural diagram of the pixel delimiting layer according to some other embodiments. Detailed Implementation

[0066] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0067] Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms, such as the third-person singular "comprises" and the present participle "comprising," are interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0068] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0069] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. The term "connected" should be interpreted broadly; for example, a "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium. The term "coupled," for example, indicates that two or more components have direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0070] "At least one of A, B and C" has the same meaning as "at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.

[0071] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0072] The use of “applies to” or “configured to” in this article implies an open and inclusive language that does not preclude applicability to or configuration to devices that perform additional tasks or steps.

[0073] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0074] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0075] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0076] Some embodiments of this disclosure provide an electronic device 100. For example... Figure 1 As shown, the electronic device 100 includes a display panel 10 and a driving circuit, with the driving circuit connected to the display panel 10. The driving circuit transmits driving signals to the display panel 10 to drive the display panel 10 to display images.

[0077] The electronic device 100 includes, but is not limited to, mobile phones, wireless devices, PDAs (Personal Digital Assistants), PIAs (Personal Information Assistants), handheld or portable computers, GPS receivers / navigators, cameras, video cameras, game consoles, wearable devices, VR (Virtual Reality) devices, AR (Augmented Reality) devices, flat panel displays, computer monitors, automotive displays (e.g., odometer displays), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rearview cameras in vehicles), electronic billboards or signs, and aesthetic structures (e.g., displays of images of a piece of jewelry).

[0078] In some embodiments, such as Figure 1 As shown, the display panel 10 includes multiple pixels, each pixel including at least three sub-pixels P, that is, each pixel may include three, four or more sub-pixels, and the multiple sub-pixels included in each pixel may be arranged in a row, a column, an L-shape, a rectangle or a rhombus, etc.

[0079] The above is for illustrative purposes only and is not intended to limit this disclosure. The specific design can be adapted according to actual needs.

[0080] In some embodiments, such as Figure 1 As shown, the display panel 10 includes a substrate 1 and a plurality of sub-pixels P disposed on the substrate 1. Each sub-pixel P includes a light-emitting unit 2 and a pixel circuit. The pixel circuit is connected to the light-emitting unit 2. The pixel circuit is used to transmit a driving voltage or driving current to the light-emitting unit to which it is connected, so as to drive the light-emitting unit 2 to emit light.

[0081] The light-emitting unit 2 can be an OLED light-emitting device.

[0082] The substrate 1 is configured to carry the film layer structure in the display panel 10. Exemplarily, the substrate 1 may be a single-layer substrate including one layer of substrate material, or a composite substrate including at least two layers of substrate material stacked together; the substrate material may be a rigid material or a flexible material.

[0083] Rigid substrate materials include, but are not limited to, rigid glass, quartz, plastic, or PMMA (Polymethylmethacrylate).

[0084] Flexible substrate materials include, but are not limited to, flexible glass, FPC, PI film (Polyimide), PC (Polycarbonate), PET (Polyethylene terephthalate), or PEN (Polyethylene naphthalate dimethyl methacrylate).

[0085] Accordingly, substrate 1 can be a rigid substrate or a flexible substrate. A rigid substrate can consist of one or more layers of rigid substrate material, or it can consist of at least one layer of rigid substrate material and at least one layer of flexible substrate material stacked together. Correspondingly, display panel 10 can be a rigid display panel or a flexible display panel.

[0086] It should be noted that the material selection of the substrate 1 is related to the specific design of the display panel 10 and can be selected according to actual needs. This is only an illustrative example and is not intended to limit the scope of this disclosure.

[0087] like Figure 2 As shown, the display panel 10 includes multiple functional film layers disposed between the substrate 1 and multiple light-emitting units 2, and an insulating layer disposed between adjacent functional film layers. The functional film layers may include a semiconductor layer B, a gate metal layer G, and a source / drain metal layer SD, etc., and the semiconductor layer B, the gate metal layer G, and the source / drain metal layer SD are used to form multiple pixel circuits in the display panel 10.

[0088] The pixel circuit includes multiple transistors T, the active layers of which are located within the semiconductor layer B. The active layer of each transistor T includes a first polar region, a second polar region, and a channel region for connecting the first polar region and the second polar region.

[0089] The control electrodes of multiple transistors T are located in the gate metal layer G, which includes, for example, multiple signal lines. The portion of a signal line that passes through the active layer of a certain transistor T can serve as the control electrode of that transistor T. Here, "passes through" refers to the portion where the orthogonal projections of the two on the substrate 1 overlap.

[0090] When fabricating transistor T, a semiconductor layer B can be formed first to obtain the active layer of transistor T, and then a gate metal layer G can be formed on the side of semiconductor layer B away from substrate 1. The position where the gate metal layer G overlaps with the semiconductor layer B is the position where the gate metal layer G "passes" through the active layer. For example, the control electrode of transistor T overlaps with the channel region of transistor T.

[0091] Alternatively, when fabricating transistor T, a gate metal layer G can be formed first, and then a semiconductor layer B can be formed on the side of the gate metal layer G away from the substrate 1 to obtain the active layer of transistor T; the position where the semiconductor layer B overlaps with the gate metal layer G is the position where the gate metal layer G "passes" through the active layer.

[0092] In some embodiments of this disclosure, the pixel circuit 30 can be a 7T1C, 8T1C, or 9T1C circuit, where T represents a transistor, the number preceding T indicates the number of transistors, and C represents a capacitor, the number preceding C indicates the number of capacitors. The control electrode, first electrode, and second electrode of each transistor T, as well as the capacitors, are connected in a predetermined manner to form a complete circuit structure.

[0093] For example, 7T1C indicates that the pixel circuit includes 7 transistors and 1 capacitor.

[0094] In some embodiments, such as Figure 2 As shown, the light-emitting unit 2 includes a first electrode 21, a first light-emitting part 22, a second electrode 23, a second light-emitting part 24 and a third electrode 25 arranged in sequence. The first light-emitting part 22 and the second light-emitting part 24 emit different colors.

[0095] In the same light-emitting unit 2, at least two of the first electrode 21, the second electrode 23, and the third electrode 25 are independently disposed in their respective electrode layers. The first light-emitting part 22 and the second light-emitting part 24 are configured to emit light independently.

[0096] For example, the first electrode 21 of each light-emitting unit 2 is configured to receive a first voltage signal, the second electrode 23 is configured to receive a second voltage signal, and the third electrode 25 is configured to receive a third voltage signal. The first voltage signal, the second voltage signal, and the third voltage signal are all different.

[0097] By applying voltages of different magnitudes to the first electrode 21 and the second electrode 23, an electric field is generated between the first electrode 21 and the second electrode 23, thereby causing the first light-emitting part 22 located between the first electrode 21 and the second electrode 23 to emit light under the action of the electric field.

[0098] Accordingly, by applying voltages of different magnitudes to the second electrode 23 and the third electrode 25, an electric field is generated between the second electrode 23 and the third electrode 25, thereby causing the second light-emitting part 24 located between the second electrode 23 and the third electrode 25 to emit light under the action of the electric field.

[0099] By integrating two light-emitting parts of different light-emitting colors in one light-emitting unit 2, and each light-emitting part in the same light-emitting unit 2 can be driven to emit light independently.

[0100] The first light-emitting unit 22 can emit light of a first color, for example, and the second light-emitting unit 24 can emit light of a second color, for example. Therefore, when the first light-emitting unit 22 is driven to emit light alone, the light-emitting unit 2 can emit light of the first color; when the second light-emitting unit 24 is driven to emit light alone, the light-emitting unit 2 can emit light of the second color; and when both the first and second light-emitting units 22 and 24 are driven to emit light simultaneously, the light-emitting unit 2 can emit light of a third color, which is obtained by mixing the first and second color lights. That is, each light-emitting unit 2 in the display panel 10 can emit three different colors of light.

[0101] Thus, with the same size of display panel 10, compared to each light-emitting unit 2 in display panel 10 emitting only one color of light, the pixel density in display panel 10 of this embodiment can be significantly improved, thereby improving the display quality of display panel 10 and making the image displayed by display panel 10 clearer and richer in detail.

[0102] Building upon this, when the display panel 10 is applied to VR or AR devices, it can reduce the screen-door effect and enhance immersion. Simultaneously, the increased pixel density can make virtual scenes more realistic and reduce eye strain.

[0103] Compared to each light-emitting unit 2 in the display panel 10 being able to emit only one color of light, the pixel density in the display panel 10 of this embodiment can be increased by 50%.

[0104] For example, the pixel density of the display panel 10 is greater than or equal to 1500ppi.

[0105] The pixel density of the display panel 10 is, for example, 1500ppi, 1800ppi, 2000ppi, 2500ppi or 4000ppi.

[0106] In some embodiments, the wavelength of the emitted color of either the first light-emitting part 22 or the second light-emitting part 24 is outside the absorption spectrum range of the other light-emitting part.

[0107] This design ensures that when the light-emitting unit 2 emits light, the first light-emitting part 22 and the second light-emitting part 24 in the light-emitting unit 2 will not affect each other's light-emitting effect, thus guaranteeing the light-emitting effect of the light-emitting unit 2. At the same time, it can also significantly improve the luminous efficiency, color purity, and lifespan of the light-emitting unit 2.

[0108] In some embodiments, the light-emitting area of ​​the first light-emitting part 22 and the light-emitting area of ​​the second light-emitting part 24 are the same; or, the difference between the light-emitting area of ​​the first light-emitting part 22 and the light-emitting area of ​​the second light-emitting part 24 is less than or equal to 2% of the light-emitting area of ​​either the first light-emitting part 22 or the second light-emitting part 24.

[0109] The luminous area of ​​the first luminous part 22 is the same as or approximately the same as the luminous area of ​​the second luminous part 24. The deviation between the luminous area of ​​the first luminous part 22 and the luminous area of ​​the second luminous part 24 is within 2%. In this way, when the first luminous part 22 and the second luminous part 24 in the luminous unit 2 emit light simultaneously, it is beneficial to the uniform mixing of different colors of light and avoids white balance shift caused by the difference in the luminous areas of the first luminous part 22 and the second luminous part 24.

[0110] In some embodiments, such as Figure 3 As shown, the light-emitting unit 2 includes a first light-emitting unit 2a and a second light-emitting unit 2b. The second light-emitting part 24 of the first light-emitting unit 2a and the second light-emitting part 24 of the second light-emitting unit 2b are both first color light-emitting parts. The first light-emitting part 22 of the first light-emitting unit 2a is a second color light-emitting part, and the first light-emitting part 22 of the second light-emitting unit 2b is a third color light-emitting part.

[0111] For example, the second light-emitting part 24a of the first light-emitting unit 2a and the second light-emitting part 24b of the second light-emitting unit 2b are both blue light-emitting parts, the first light-emitting part 22a of the first light-emitting unit 2a is a red light-emitting part, and the first light-emitting part 22b of the second light-emitting unit 2b is a green light-emitting part.

[0112] Based on the previous description of the light-emitting unit 2, the first light-emitting unit 2a can emit red, blue, or purple light. The second light-emitting unit 2b can emit green, blue, and cyan light.

[0113] Each first light-emitting unit 2a is arranged adjacent to at least one second light-emitting unit 2b. Thus, when two adjacent first light-emitting units 2a and second light-emitting units 2b emit light simultaneously, the first light-emitting portion 22a of the first light-emitting unit 2a and the first light-emitting portion 22b of the second light-emitting unit 2b can mix colors to emit yellow light. Furthermore, when the second light-emitting portion 24 of at least one of the first light-emitting units 2a and the second light-emitting unit 2b emits light simultaneously, it can mix colors to emit white light.

[0114] By controlling each light-emitting part in the first light-emitting unit 2a and the second light-emitting unit 2b to emit light independently, the full-color display of the display panel 10 can be achieved by controlling each light-emitting part in the first light-emitting unit 2a and the second light-emitting unit 2b.

[0115] In some embodiments, in the light-emitting unit 2, the distance between two electrodes adjacent to the blue light-emitting part is 1850A, the distance between two electrodes adjacent to the green light-emitting part is 2400A, and the distance between two electrodes adjacent to the red light-emitting part is 2900A.

[0116] It should be noted that, considering that there may be unavoidable process deviations in the manufacturing process of the display panel 10, the distance between two electrodes adjacent to a light-emitting part in the light-emitting unit described herein is not limited to the specific value given in this embodiment. Any actual distance fluctuating by 15% above or below the specific value given in this embodiment is within the scope of protection claimed in this disclosure.

[0117] The distance between the two electrodes adjacent to the light-emitting part mentioned here is the microcavity thickness of the light-emitting part. By setting the microcavity thickness of the light-emitting parts of different emitting colors in the light-emitting unit 2 within a certain range, the microcavity effect of the light-emitting part can be optimized, and the luminous effect of the light-emitting part can be improved.

[0118] On the one hand, this allows the light-emitting part in the light-emitting unit 2 to have a lower voltage, thereby reducing the power consumption of the light-emitting unit 2. On the other hand, the wavelength range of the light emitted by the light-emitting part can be kept within a smaller range, reducing unnecessary wavelength emission, making the emitted color of the light-emitting part more accurate, and improving the luminous efficiency. As a result, the display panel 10 has a wider color gamut coverage and more accurate color performance.

[0119] That is, by setting the microcavity thickness of the light-emitting part in the light-emitting unit 2 within a preset range, each light-emitting part in the light-emitting unit 2 can have the advantages of low driving voltage and narrow spectrum, which is beneficial to improving the display quality of the display panel 10.

[0120] For example, the light-emitting part of the light-emitting unit 2 includes an organic light-emitting layer (EML).

[0121] Meanwhile, in addition to the organic light-emitting layer EML, the light-emitting part of the light-emitting unit 2 may also include one or more of the following: an electron transport layer ETL (Election Transporting Layer), an electron injection layer EIL (Election Injection Layer), a hole transport layer HTL (Hole Transporting Layer), and a hole injection layer HIL (Hole Injection Layer), thereby improving the light-emitting efficiency of the light-emitting unit 2 in the display panel 10.

[0122] In some embodiments, such as Figure 3 and Figure 4 As shown, the second electrode 23 is a transparent electrode or a semi-transparent and semi-reflective electrode, and the third electrode 25 is a transparent electrode or a semi-transparent and semi-reflective electrode.

[0123] In this way, the light emitted by the first light-emitting part 22 and the second light-emitting part 24 in the light-emitting unit 2 can pass through the second electrode 22 / third electrode 25 and be emitted out, thus ensuring the light-emitting efficiency of the light-emitting unit 2.

[0124] For example, the second electrode 23 has a transmittance of 90% or more for light with a wavelength range of 300 nm to 1100 nm.

[0125] For example, the transmittance of the second electrode 23 for light with a wavelength range of 420nm to 480nm is greater than or equal to 65%.

[0126] For example, the transmittance of the second electrode 23 for light with a wavelength range of 520nm to 560nm is greater than or equal to 78%.

[0127] For example, the transmittance of the second electrode 23 for light with a wavelength range of 620nm to 770nm is greater than or equal to 80%.

[0128] For example, the transmittance of the second electrode 23 for light with a wavelength range of 780nm to 1400nm is greater than or equal to 90%.

[0129] For example, the reflectivity of the second electrode 23 to light with a wavelength range of 420nm to 480nm is less than or equal to 30%.

[0130] For example, the transmittance of the second electrode 23 for light with a wavelength range of 520nm to 560nm is less than or equal to 13%.

[0131] For example, the transmittance of the second electrode 23 for light with wavelengths in the range of 620nm to 770nm is less than or equal to 10%.

[0132] For example, the transmittance of the third electrode 25 for light with a wavelength range of 300nm to 1100nm is greater than or equal to 60%.

[0133] In some embodiments, the sheet resistance of the material of the second electrode 23 is less than or equal to 10 Ω / cm. 2 ; and / or, the work function of the material of the second electrode 23 is in the range of 3eV to 5eV.

[0134] When the sheet resistance of the material of the second electrode 23 is within a preset range, the lateral resistance of the second electrode 23 can be reduced, the voltage drop of the second voltage signal transmitted to the second electrode 23 can be reduced, and the power consumption of the light-emitting unit 2 can be reduced.

[0135] When the work function of the material of the second electrode 23 is within a preset range, it is beneficial to optimize the carrier injection of the light-emitting part in the light-emitting unit 2 and extend the lifetime of the light-emitting unit 2.

[0136] When the light-emitting unit 2 emits light for an extended period of time, the temperature of the electrodes in the light-emitting unit 2 will change as the emitting time increases. The material of the second electrode 23 needs to have characteristics that are not easily affected by temperature, so as to avoid the problem that the resistance of the second electrode 23 changes significantly due to temperature changes, thereby affecting the luminous effect of the light-emitting unit 2.

[0137] For example, the sheet resistance of the material of the second electrode 23 is less than 10% after being heated at 200°C for 2 hours.

[0138] For example, the thickness of the second electrode 23 is in the range of 9 nm to 11 nm. The thickness of the second electrode 23 is, for example, 9 nm, 10 nm or 11 nm.

[0139] If the second electrode 23 is too thin, its resistance may increase, affecting the uniform distribution of current and potentially causing localized overheating, thus accelerating the aging of the light-emitting unit 2. Conversely, if the second electrode 23 is too thick, although it can reduce the resistance of the second electrode 23, it will increase the overall thickness of the light-emitting unit 2 and may affect the transmittance of the second electrode 23.

[0140] By setting the thickness of the second electrode 23 within a certain range, the second electrode 23 can achieve good light emission effect while having good transmittance and its own resistance is within a suitable range.

[0141] For example, the material of the second electrode 23 includes one of a transparent oxide, a metallic element, or a metallic compound.

[0142] For example, the material of the second electrode 23 can be IGZO (Indium Gallium Zinc Oxide) or ITO (Indium Tin Oxide).

[0143] For example, the material of the second electrode 23 can be silver, lithium silver alloy, or magnesium silver alloy, etc.

[0144] Based on the foregoing embodiments, the materials of the second electrode 22a of the first light-emitting unit 2a and the second electrode 22b of the second light-emitting unit 2b may be the same or different. The materials of the third electrode 25a of the first light-emitting unit 2a and the third electrode 25b of the second light-emitting unit 2b may be the same or different.

[0145] In some embodiments, the sheet resistance of the second electrode 23a of the first light-emitting unit 2a is less than the sheet resistance of the second electrode 23b of the second light-emitting unit 2b; and / or, the work function of the material of the second electrode 23a of the first light-emitting unit 2a is greater than the work function of the material of the second electrode 23b of the second light-emitting unit 2b.

[0146] For example, the sheet resistance of the second electrode 23a of the first light-emitting unit 2a is less than or equal to 7 Ω / cm. 2 The sheet resistance of the second electrode 23b of the second light-emitting unit 2b is 7Ω / cm. 2 .

[0147] The work function of the material of the second electrode 23a of the first light-emitting unit 2a is in the range of 4.5eV to 5eV, and the work function of the material of the second electrode 23b of the second light-emitting unit 2b is in the range of 3eV to 5eV.

[0148] The second electrode 22a of the first light-emitting unit 2a and the second electrode 22b of the second light-emitting unit 2b can be made of different materials. The characteristic parameters of the different materials are matched to the requirements of the first light-emitting unit 2a and the second light-emitting unit 2b to ensure the light-emitting effect of the first light-emitting unit 2a and the second light-emitting unit 2b.

[0149] Based on the foregoing embodiments, such as Figure 4 As shown, the thickness of the first electrode 21 of the light-emitting unit 2 is greater than the thickness of the second electrode 23 of the light-emitting unit 2, and is also greater than the thickness of the third electrode 25 of the light-emitting unit 2.

[0150] By increasing the thickness of the first electrode 21, the reflectivity of the first electrode 21 can be improved, thereby increasing the light output efficiency of the light-emitting unit 2.

[0151] In some embodiments, the first electrode 21 and the second electrode 23 in the same light-emitting unit 2 are respectively connected to a pixel circuit.

[0152] For example, the display panel 10 includes a first pixel circuit and a second pixel circuit, the first electrode 21 in the light-emitting unit 2 is connected to the first pixel circuit, and the second electrode 23 is connected to the second pixel circuit.

[0153] The first pixel circuit is configured to transmit a first voltage signal to the first electrode 21, and the second pixel circuit is configured to transmit a second voltage signal to the second electrode 23.

[0154] In addition, the display panel 10 also includes a voltage signal line 6, which is connected to the third electrode 25. The voltage signal line 6 is configured to transmit a third voltage signal to the third electrode 25. The voltage signal line 6 may be a VSS signal line.

[0155] In other embodiments, such as Figure 2 As shown, the first electrode 21 and the second electrode 23 in the same light-emitting unit 2 are both connected to the same pixel circuit; the pixel circuit is configured to transmit a first voltage signal to the first electrode 21 and a second voltage signal to the second electrode 23 in a time-division manner.

[0156] For example, the pixel circuit may use PWM dimming to drive the light-emitting unit 2 to emit light.

[0157] Specifically, when the first light-emitting part 22 in the light-emitting unit 2 needs to emit light, the pixel circuit alternately transmits a first voltage signal to the first electrode 21 and a second voltage signal to the second electrode 23, thereby driving the first light-emitting part 23 to emit light.

[0158] When the second light-emitting part 24 in the light-emitting unit 2 needs to emit light, the pixel circuit transmits a second voltage signal to the second electrode 23, and the voltage signal line 6 transmits a voltage signal vss to the third electrode 25, thereby driving the second light-emitting part 24 to emit light.

[0159] When both the first light-emitting part 22 and the second light-emitting part 24 in the light-emitting unit 2 are to emit light, the voltage signal line 6 transmits a voltage signal vss to the third electrode 25, and the pixel circuit alternately transmits a first voltage signal to the first electrode 21 and a second voltage signal to the second electrode 23, thereby driving the first light-emitting part 22 and the second light-emitting part 24 in the light-emitting unit 2 to emit light.

[0160] In some embodiments, when the first light-emitting part 22 and the second light-emitting part 24 are configured to emit light with the same luminous intensity, the driving voltage of the first light-emitting part 22 is the same as the driving voltage of the second light-emitting part 24; or, the difference between the driving voltage of the first light-emitting part 22 and the driving voltage of the second light-emitting part 24 is less than or equal to 10% of the ratio of the driving voltage of the first light-emitting part 22 and the second light-emitting part 24.

[0161] The first light-emitting part 22 and the second light-emitting part 24 in the light-emitting unit 2 have the same or similar driving voltage. Correspondingly, the driving voltage of each light-emitting unit 2 in the display panel 10 is the same or similar. In this way, the brightness uniformity of the display panel 10 can be improved and the display effect of the display panel 10 can be guaranteed.

[0162] At the same time, it can also avoid color deviation in the display panel 10 (such as local yellowing or blue in a white screen), ensuring the display effect of the display panel 10.

[0163] In some embodiments, such as Figure 2 and Figure 4 As shown, the display panel 10 further includes a pixel definition layer (PDL) and a first electrode layer 3 disposed on the substrate 1. The pixel definition layer (PDL) includes a first opening K1 and a second opening K2 spaced apart from each other. The first light-emitting portion 22 is located at least within the first opening K1, and the second opening K2 is located beside the first opening K1. The first electrode layer 3 includes a first electrode 21 and a first transition portion 31 disposed at intervals. The first electrode 21 is disposed within the first opening K1, and the first transition portion 31 is disposed within the second opening K2 and connected to the second electrode 23.

[0164] In the process of manufacturing the display panel 10, a pixel delimiting layer (PDL) can be formed first, and then a first electrode layer 3 can be formed. The first electrode layer 3 includes a first electrode 21 of each light-emitting unit 2 and a first adapter 31. The second electrode 23 of the light-emitting unit 2 is led out downward through the first adapter 31, thereby connecting the second electrode 23 to the pixel circuit.

[0165] like Figure 2 As shown, the display panel 10 may include two source / drain metal layers SD, for example... Figure 2 The first source-drain metal layer SD1 and the second source-drain metal layer SD2 are shown in the figure. The source and drain of the transistor T connected to the light-emitting unit 2 in the pixel circuit can be located in the first source-drain metal layer SD1 or in the second source-drain metal layer SD2.

[0166] Taking the source and drain of transistor T located within the first source-drain metal layer SD1 as an example, the first electrode 21 and the second electrode 23 of the light-emitting unit 2 can be directly connected to transistor T, or, as... Figure 2 As shown, the first electrode 21 and the second electrode 23 of the light-emitting unit 2 can also be connected to the transistor T through the transfer electrode in the second source-drain metal layer SD2.

[0167] In some embodiments, such as Figure 4 and Figure 5As shown, the edge of the first light-emitting part 22 extends into the second opening K2. The second opening K2 includes a first sidewall B1 and a second sidewall B2. The first sidewall B1 is closer to the first opening K1 than the second sidewall B2. There is a first gap j1 between the edge of the first light-emitting part 22 and the second sidewall B2. The first gap j1 exposes at least a portion of the surface of the first transition part 31. The edge of the second electrode 23 extends to the first gap j1 and contacts the first transition part 31.

[0168] In this way, the second electrode 23 of the light-emitting unit 2 is led down to the pixel circuit through the first adapter 31.

[0169] In some embodiments, such as Figure 4 and Figure 5 As shown, the display panel 10 further includes a first conductive pattern D1 disposed between the first electrode layer 3 and the substrate 1, and the first conductive pattern D1 is connected to the first transition portion 31. The first conductive pattern D1 is configured to transmit a second voltage signal to the second electrode 23.

[0170] The first conductive pattern D1 can be the source or drain of the transistor T in the pixel circuit, or it can be a transition electrode. The second electrode 23 is connected to the pixel circuit through the transition electrode. The second electrode 23 of the light-emitting unit 2 is connected to the pixel circuit through the first transition part 31.

[0171] For example, such as Figure 4 and Figure 5 As shown, the display panel 10 also includes a planarization layer PLN disposed between the first pixel circuit and the first electrode layer 3. The planarization layer PLN has a first adapter hole Q1 located below the second opening K2. The first adapter part 31 passes through the first adapter hole Q1 and is connected to the pixel circuit.

[0172] The planarization layer PLN mentioned here refers to, for example, Figure 4 and Figure 5 The second planarization layer PLN2 is shown in the figure.

[0173] In some embodiments, such as Figure 4 and Figure 5 As shown, the pixel defining layer (PDL) also includes a third opening K3, which is located beside the first opening K1. The first electrode layer 3 also includes a second transition portion 32, which is disposed within the third opening K3 and connected to the third electrode 25.

[0174] By setting the third opening K3, the second transition portion 32 can be formed at the same time as the first electrode 21, without adding any additional preparation steps to the display panel 10.

[0175] In some embodiments, such as Figure 4 and Figure 5As shown, the display panel 10 includes multiple light-emitting units 2, the first electrode layer 3 includes multiple second transition parts 32, and the third electrodes 25 of the multiple light-emitting units 2 are interconnected through the multiple second transition parts 32.

[0176] In this way, the third electrodes 25 of each light-emitting unit in the display panel 10 are connected to each other and can be regarded as a whole. Thus, when at least some of the multiple adapters 32 are connected to the voltage signal line 6, all the third electrodes 25 can be connected to the voltage signal line 6 and can normally receive the voltage signal from the voltage signal line 6.

[0177] In some embodiments, such as Figure 4 and Figure 5 As shown, the display panel 10 also includes an isolation structure 5, which includes a first isolation portion 51 and a second isolation portion 52. The first isolation portion 51 is disposed on the side of the pixel defining layer PDL away from the substrate 1, and the second isolation portion 52 is disposed on the side of the first isolation portion 51 away from the substrate 1.

[0178] The isolation structure 5 includes a fourth opening K4. The edge of the second isolation portion 52 protrudes from the inner wall of the first isolation portion 51. The first electrode 21, the first light-emitting portion 22, the second electrode 23, and the second light-emitting portion 24 are all located within the area of ​​the fourth opening K4. The first isolation portion 51 is made of a conductive material. The third electrode 25 is connected to the first isolation portion 51, and the first isolation portion 51 is connected to the second transition portion 32.

[0179] For example, the material of the first isolation portion 51 includes, but is not limited to, at least one of aluminum, silver, indium tin oxide, indium zinc oxide, indium gallium oxide, gallium zinc oxide, and zinc oxide.

[0180] like Figure 4 and Figure 5 As shown, the first isolation section 51 and the second isolation section 52 of the isolation structure 5 form an undercut structure, and the first isolation section 51 and the second isolation section 52 form a cross-sectional structure similar to an "eave".

[0181] During the fabrication of the display panel 10, the first light-emitting part 22 and the second electrode 23 of each light-emitting unit 2 can be formed at the corresponding positions using FMM (Fine Metal Mask) technology.

[0182] The second light-emitting part 24 and the third electrode 25 of each light-emitting unit 2 can be light-emitting material or electrode material that is deposited in a whole layer. Due to the presence of the isolation structure 5, the light-emitting material and the electrode material will naturally break off at the "eaves" part during the whole layer deposition process. The light-emitting material that falls into the fourth opening K4 forms the second light-emitting part 24 of each light-emitting unit 2, and the electrode material that falls into the fourth opening K4 forms the third electrode 25 of each light-emitting unit 2.

[0183] The luminescent and electrode materials formed on the isolation structure 5 can be retained or removed, depending on the specific needs of the design.

[0184] In some embodiments, such as Figure 4 and Figure 5 As shown, the third electrodes 25 of the plurality of light-emitting units 2 of the display panel 10 are interconnected through a first isolation part 51 and a second adapter part 32.

[0185] In this way, the third electrodes 25 of each light-emitting unit in the display panel 10 are connected to each other and can be regarded as a whole. Thus, when at least some of the multiple adapters 32 are connected to the voltage signal line 6, all the third electrodes 25 can be connected to the voltage signal line 6 and can normally receive the voltage signal from the voltage signal line 6.

[0186] In some embodiments, such as Figure 3 and Figure 4 As shown, the first isolation portion 51 includes a first portion 511 and a second portion 512 connected to each other. The first portion 511 is located above the pixel defining layer (PDL), and the second portion 512 is located within the range of the third opening K3. The third electrode 25 contacts the sidewall of the first portion 511, and the second portion 512 contacts the second transition portion 32.

[0187] The third electrode 25 of the light-emitting unit 2 is connected to the second adapter 32 through the first isolation part 51, thereby realizing the downward lead of the third electrode 25, so that the third electrode 25 is connected to the voltage signal line 6 through the first isolation part 51 and the second adapter 32.

[0188] In some embodiments, such as Figure 4 As shown, the second portion 512 of the first isolation portion 51 is in contact with the second transition portion 32 away from the substrate 1.

[0189] The second part 512 of the first isolation section 51 overlaps with a portion of the pixel delimiting layer PDL, and the two together serve to divide the sub-pixel region.

[0190] In some embodiments, such as Figure 4 As shown, the second part 512 of the first isolation part 51 extends along the side wall of the third opening K3 and contacts the side wall of the second transition part 32.

[0191] The second part 512 of the first isolation part 51 is "embedded" in the first electrode layer 3. On the one hand, it can increase the contact area between the first isolation part 51 and the second transition part 32 in the first electrode layer 3, and reduce the contact resistance between the first isolation part 51 and the first electrode layer 3. On the other hand, it can also play a certain role in fixing the isolation structure 5, preventing the isolation structure 5 from tipping over or peeling off at the bottom.

[0192] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the distance from the upper surface of the third electrode 25 to the substrate 1 is less than the distance from the upper surface of the isolation structure 5 to the substrate 1, and the distance between the upper surface of the third electrode 25 and the upper surface of the isolation structure 5 is greater than the first threshold. The edge of the third electrode 25 is connected to the first isolation portion 51.

[0193] When the distance from the upper surface of the third electrode 25 to the substrate 1 differs significantly from the distance from the upper surface of the isolation structure 5 to the substrate 1, the material of the third electrode 25 will naturally break at the isolation structure 5 during the formation of the third electrode 25, forming multiple independent, mutually separated third electrodes 25.

[0194] In other embodiments, the distance between the upper surface of the third electrode 25 and the upper surface of the isolation structure 5 is less than or equal to a first threshold; the third electrodes 25 of the plurality of light-emitting units 2 are interconnected to form an integral structure.

[0195] When the distance from the upper surface of the third electrode 25 to the substrate 1 is small compared with the distance from the upper surface of the isolation structure 5 to the substrate 1, the material of the third electrode 25 will not break at the isolation structure 5 when the third electrode 25 is formed, but will form multiple interconnected third electrodes 25.

[0196] In some embodiments, such as Figure 2 and Figure 4 As shown, the display panel 10 further includes a voltage signal line 6 disposed between the first electrode layer 3 and the substrate 1, and the voltage signal line 6 is connected to the second adapter 32. The voltage signal line 6 is configured to transmit a third voltage signal to the third electrode 25.

[0197] The third voltage signal is transmitted to the third electrode 25 through the voltage signal line 6, and the second voltage signal is transmitted to the second electrode 23 through the pixel circuit. In this way, the second light-emitting part 24 emits light under the action of the electric field formed between the second electrode 23 and the third electrode 25.

[0198] In some embodiments, such as Figure 4As shown, the display panel 10 also includes a planarization layer PLN disposed between the voltage signal line 6 and the first electrode layer 3. The planarization layer PLN has a second adapter hole Q2 located below the third opening K3. The second adapter portion 32 passes through the second adapter hole Q2 and is connected to the third conductive pattern D3.

[0199] The third conductive pattern D3 can be a voltage signal line 6 or a transition electrode connected to the voltage signal line 6. The third electrode 25 is connected to the voltage signal line 6 through the first isolation part 51 and the second transition part 32.

[0200] In some embodiments, the display panel 10 includes a plurality of isolation structures 5, each isolation structure 5 being disposed corresponding to a light-emitting unit 2.

[0201] In some examples, such as Figure 2 and Figure 3 As shown, in the multiple isolation structures 5, adjacent isolation structures 5 are spaced apart from each other.

[0202] Since the isolation structure 5 is connected between the third electrode 25 and the voltage signal line 6, and the isolation structure 5, the third electrode 25 and the voltage signal line 6 are all used to transmit the third voltage signal, in some other examples, multiple isolation structures 5 are connected to each other to form an integral structure.

[0203] In some embodiments, such as Figure 6 As shown, a plurality of second openings K2 are arranged around the first opening K1 in the circumferential direction, or the second openings K2 extend along the circumferential direction of the first opening K1.

[0204] By forming a first opening K1 and a second opening K2 on the pixel defining layer PDL, when forming the first electrode layer 3, the electrode material filled in the first opening K1 forms the first electrode 21 of the light-emitting unit 2, and the electrode material filled in the second opening K2 forms the first transition portion 31. The first electrode 21 and the first transition portion 31 are formed simultaneously in one fabrication process, simplifying the fabrication steps of the display panel 10.

[0205] In this way, on the one hand, the area of ​​the second opening K2 can be increased, thereby forming more first transition portions 31, which helps to reduce the resistance of the first transition portions 31. At the same time, the larger the contact area at the connection position between the second electrode 23 and the first transition portion 31, the smaller the contact resistance between them, which helps to achieve low power consumption of the display panel 10.

[0206] In other embodiments, such as Figure 7 As shown, the second opening K2 surrounds the first opening K1.

[0207] In this way, the contact area at the connection point between the second electrode 23 and the first adapter 31 is larger, which can better reduce the contact resistance between the second electrode 23 and the first adapter 31, and facilitate the realization of low power consumption of the display panel 10.

[0208] Accordingly, in some embodiments, a plurality of third openings K3 are circumferentially arranged around the first opening K1, or the third openings K3 extend circumferentially along the first opening K1. In other embodiments, the third openings K3 surround the first opening K1. The arrangement of the third openings K3 is similar to that of the second opening K2, and is intended to achieve similar technical effects. For details, please refer to the description of the second opening K2, which will not be repeated here.

[0209] In some embodiments, such as Figure 8 As shown, the pixel delimiting layer PDL includes multiple third openings K3, which are interconnected to form a mesh.

[0210] This can better reduce the contact resistance between the third electrode 25 and the butterfly adapter 32, which is beneficial to achieving low power consumption of the display panel 10.

[0211] In some embodiments, the pixel definition layer (PDL) can be a black pixel definition layer (BPDL). The light absorption rate of the pixel definition layer (PDL) is greater than or equal to 90%.

[0212] This prevents the light emitted by the second light-emitting part 24 from being transmitted downwards to excite the first light-emitting part 22, thus ensuring the normal display of the display panel 10.

[0213] Based on this, in some embodiments, along the thickness direction of the display panel 10, the upper surface of the pixel defining layer PDL is located between the upper surface of the second electrode 23 and the lower surface of the second electrode 23.

[0214] By setting the height of the pixel boundary layer (PDL) to exceed the first light-emitting part 22 but not the second light-emitting part 24, the problem of mutual light absorption between different light-emitting parts can be effectively avoided, thus ensuring the light emission quality of the display panel 10.

[0215] In some embodiments, such as Figure 3 and Figure 4 As shown, the display panel 10 further includes a second conductive pattern D2 disposed between the substrate 1 and the first electrode layer 3, the second conductive pattern D2 being connected to the first electrode 21; the second conductive pattern D2 is configured to transmit a first voltage signal to the first electrode 21.

[0216] The second conductive pattern D2 can be the source or drain of the transistor T in the pixel circuit, or it can be a transition pattern connected to the pixel circuit.

[0217] In some embodiments, the display panel 10 further includes a planarization layer PLN disposed between the second conductive pattern D2 and the first electrode layer 3, wherein the planarization layer PLN has a second transition hole Q2 located below the third opening K3, and the second transition portion 32 passes through the second transition hole Q2 and is connected to the second conductive pattern D2.

[0218] The planarization layer PLN can protect the source and drain metal layers SD. At the same time, the surface of the planarization layer PLN is relatively flat. When the pixel boundary layer PDL and the first electrode layer 3 are formed subsequently, the pixel boundary layer PDL can be formed on the flat surface, which is beneficial to improving the preparation yield of the pixel boundary layer PDL.

[0219] In some embodiments, the display panel 10 further includes an inorganic encapsulation layer 4 disposed on the side of the isolation structure 5 away from the substrate 1. The inorganic encapsulation layer 4 includes a plurality of inorganic encapsulation portions 41, at least a portion of each inorganic encapsulation portion 41 being located within a fourth opening K4 and covering a third electrode 25. The plurality of inorganic encapsulation portions 41 are interconnected to form an integral structure.

[0220] By setting the inorganic encapsulation layer 4, water and oxygen in the environment can be prevented from entering the display panel 10, thereby avoiding adverse effects on the light-emitting performance of the light-emitting unit 2 and improving the service life of the display panel 10.

[0221] In some embodiments, such as Figure 9 As shown, the display panel 10 further includes an inorganic encapsulation layer 4 disposed on the side of the isolation structure 5 away from the substrate 1. The inorganic encapsulation layer 4 includes a plurality of inorganic encapsulation portions 41, which are spaced apart from each other, and at least a portion of each inorganic encapsulation portion 41 is located in a fourth opening K4 and covers a third electrode 25.

[0222] In this case, during the fabrication of the display panel 10, a second light-emitting material layer (the second light-emitting material is used to form the second light-emitting part 25), a third electrode material layer, and an inorganic encapsulation material layer can be sequentially stacked using an open mask. During this process, the second light-emitting material layer, the third electrode material layer, and the inorganic encapsulation material layer will naturally break at the isolation structure 5. The portion of the second light-emitting material layer that falls into the fourth opening K4 forms the second light-emitting part 24, the portion of the third electrode material layer that falls into the fourth opening K4 forms the third electrode 25, and the portion of the inorganic encapsulation material layer that falls into the fourth opening K4 forms the inorganic encapsulation part 41. At this time, the light-emitting unit 2 has completed independent encapsulation.

[0223] The thickness of the third electrode 25 formed in this way is greater than that formed by the FMM process. Correspondingly, the resistance of the third electrode 25 is smaller, and the driving voltage of the second light-emitting part 24 is also reduced.

[0224] The driving voltage of the blue light-emitting part is greater than that of the red / green light-emitting part. Through the above process, the thickness of the third electrode 25 formed in the display panel 10 is increased and the resistance is reduced. Therefore, under the same driving current, the driving voltage of the blue light-emitting part will decrease accordingly, thereby adjusting the driving voltage of each light-emitting part in the light-emitting unit 2 to be the same or close.

[0225] In some embodiments, such as Figure 10 As shown, the display panel 10 further includes: a fourth conductive pattern D4 disposed on the side of the isolation structure 5 away from the substrate 1, and an auxiliary electrode 9 disposed in the fourth opening K4. The fourth conductive pattern D4 and the third electrode 25 are formed in the same film layer. The auxiliary electrode 9 covers part of the sidewall of the fourth opening K4 and is connected to the third electrode 25.

[0226] like Figure 10 As shown, the edge portion of the auxiliary electrode 9 extends along the lower surface of the second isolation portion 52 of the isolation structure 5 to the upper surface of the second isolation portion 52 of the isolation structure 5 and is connected to the fourth conductive pattern D4.

[0227] Referring to the previous description of the preparation process of the third electrode 25, the fourth conductive pattern D4 is the electrode material deposited on the isolation structure 5 during the formation of the third electrode 25. The fourth conductive pattern D4 is disconnected from the third electrode 25 and is electrically insulated from the third electrode 25.

[0228] In this embodiment, by setting an auxiliary electrode 9, the fourth conductive pattern D4 is connected to the third electrode 25, thereby further reducing the resistance of the third electrode 5 and lowering the driving voltage of the second light-emitting part 24.

[0229] CPM (Cathode Patterning Material) is a material that selectively deposits only on metal materials. Therefore, metal materials are difficult to adhere to where CPM material is present, thus reducing metal adhesion. In the fabrication process of the display panel 10, the step of forming the auxiliary electrode 9 follows the step of forming the third electrode 25. During the fabrication of the auxiliary electrode 9, CPM can be formed in the areas other than where the auxiliary electrode 9 needs to be formed, and then electrode material is deposited. Since the electrode material is difficult to adhere to the CPM, the auxiliary electrode 9 can be formed on the top edge and sidewalls of the isolation structure 5.

[0230] By setting CPM, during the formation of auxiliary electrode 9, electrode material will not adhere to the top of isolation structure 5 over a large area, thereby avoiding the problem of increased thickness of display panel 10 caused by the re-deposition of electrode material on the top of isolation structure 5.

[0231] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display panel, characterized in that, include: Substrate; A light-emitting unit is disposed on the substrate; the light-emitting unit includes: a first electrode, a first light-emitting part, a second electrode, a second light-emitting part and a third electrode sequentially stacked along the thickness direction of the display panel and away from the substrate, wherein the first light-emitting part and the second light-emitting part emit different colors; In the same light-emitting unit, at least two of the first electrode, the second electrode, and the third electrode are independently disposed in their respective electrode layers; the first light-emitting part and the second light-emitting part are configured to emit light independently.

2. The display panel according to claim 1, characterized in that, The display panel also includes: A pixel defining layer is disposed on the substrate; the pixel defining layer includes a first opening and a second opening spaced apart from each other, the first light-emitting portion is located at least in the first opening, and the second opening is located beside the first opening; A first electrode layer is disposed on the substrate; the first electrode layer includes a first electrode and a first transition portion disposed at intervals; the first electrode is disposed in the first opening, and the first transition portion is disposed in the second opening and connected to the second electrode.

3. The display panel according to claim 2, characterized in that, The edge of the first light-emitting part extends into the second opening; The second opening includes a first sidewall and a second sidewall, the first sidewall being closer to the first opening than the second sidewall, a first gap between the edge of the first light-emitting part and the second sidewall, the first gap exposing at least a portion of the surface of the first adapter, and the edge of the second electrode extending to the first gap and contacting the first adapter.

4. The display panel according to claim 3, characterized in that, The display panel also includes: A first conductive pattern is disposed between the substrate and the first electrode layer; the first conductive pattern is connected to the first transition portion; the first conductive pattern is configured to transmit a second voltage signal to the second electrode.

5. The display panel according to claim 4, characterized in that, The display panel also includes: A planarization layer is disposed between the first conductive pattern and the first electrode layer; The planarization layer has a first adapter hole located below the second opening, and the first adapter portion passes through the first adapter hole and connects to the first conductive pattern.

6. The display panel according to claim 2, characterized in that, A plurality of second openings are arranged circumferentially around the first opening; or, The second opening extends circumferentially along the first opening.

7. The display panel according to claim 6, characterized in that, The second opening surrounds the first opening.

8. The display panel according to claim 2, characterized in that, The pixel defining layer further includes a third opening, which is located next to the first opening; The first electrode layer further includes a second transition portion, which is disposed within the third opening and connected to the third electrode.

9. The display panel according to claim 8, characterized in that, The display panel includes a plurality of light-emitting units, the first electrode layer includes a plurality of second transition portions, and the third electrodes of the plurality of light-emitting units are interconnected through the plurality of second transition portions.

10. The display panel according to claim 8, characterized in that, The display panel also includes: An isolation structure includes a first isolation portion and a second isolation portion; the first isolation portion is disposed on the side of the pixel defining layer away from the substrate, and the second isolation portion is disposed on the side of the first isolation portion away from the substrate. The isolation structure includes a fourth opening, the edge of the second isolation portion protrudes from the inner wall of the first isolation portion, and the first electrode, the first light-emitting portion, the second electrode, and the second light-emitting portion are all located within the range of the fourth opening; The first isolation part is made of a conductive material, the third electrode is connected to the first isolation part, and the first isolation part is connected to the second transition part.

11. The display panel according to claim 10, characterized in that, The display panel includes a plurality of light-emitting units, and the third electrodes of the plurality of light-emitting units are interconnected through the first isolation part and the second transition part.

12. The display panel according to claim 10, characterized in that, The first isolation portion includes a first part and a second part connected to each other, the first part being located above the pixel defining layer, and the second part being located within the range of the third opening; The third electrode contacts the sidewall of the first part, and the second part contacts the second transition part.

13. The display panel according to claim 12, characterized in that, The second portion of the first isolation portion contacts the second transition portion away from the substrate; or, The second portion of the first isolation section extends along the sidewall of the third opening and contacts the sidewall of the second transition section.

14. The display panel according to claim 10, characterized in that, The distance from the upper surface of the third electrode to the substrate is less than the distance from the upper surface of the isolation structure to the substrate, and the distance between the upper surface of the third electrode and the upper surface of the isolation structure is greater than a first threshold. The edge of the third electrode is connected to the first isolation portion.

15. The display panel according to claim 10, characterized in that, The distance between the upper surface of the third electrode and the upper surface of the isolation structure is less than or equal to a first threshold. The third electrodes of the multiple light-emitting units are interconnected to form an integral structure.

16. The display panel according to claim 10, characterized in that, The display panel also includes: A voltage signal line is disposed between the substrate and the first electrode layer; the voltage signal line is connected to the second adapter; the voltage signal line is configured to transmit a third voltage signal to the third electrode.

17. The display panel according to claim 16, characterized in that, The display panel also includes: A planarization layer is disposed between the voltage signal line and the first electrode layer; The planarization layer has a second adapter hole located below the third opening, and the second adapter portion passes through the second adapter hole to connect to the voltage signal line.

18. The display panel according to claim 10, characterized in that, The display panel includes a plurality of the isolation structures, and each isolation structure is correspondingly disposed with one of the light-emitting units; In the plurality of said isolation structures, two adjacent isolation structures are spaced apart from each other; or, Multiple isolation structures are interconnected to form a single structure.

19. The display panel according to claim 10, characterized in that, The first opening is circumferentially surrounded by a plurality of the third openings; or, The third opening extends circumferentially along the first opening.

20. The display panel according to claim 19, characterized in that, The third opening surrounds the first opening.

21. The display panel according to claim 20, characterized in that, The pixel defining layer includes a plurality of third openings, which are interconnected to form a mesh.

22. The display panel according to claim 2, characterized in that, The light absorption rate of the pixel defining layer is greater than or equal to 90%.

23. The display panel according to claim 2, characterized in that, Along the thickness direction of the display panel, the upper surface of the pixel defining layer is located between the upper surface of the second electrode and the lower surface of the second electrode.

24. The display panel according to claim 8, characterized in that, The display panel also includes: A second conductive pattern is disposed between the substrate and the first electrode layer; the second conductive pattern is connected to the first electrode; the second conductive pattern is configured to transmit a first voltage signal to the first electrode.

25. The display panel according to claim 24, characterized in that, The display panel also includes: A planarization layer is disposed between the second conductive pattern and the first electrode layer; The planarization layer has a third adapter hole located below the first opening, and the first electrode passes through the third adapter hole to connect with the second conductive pattern.

26. The display panel according to claim 2, characterized in that, The display panel includes: A pixel circuit is disposed between the substrate and the first electrode layer; the first electrode and the second electrode in the same light-emitting unit are both connected to the same pixel circuit; the pixel circuit is configured to transmit a first voltage signal to the first electrode and a second voltage signal to the second electrode in a time-division multiplexing manner.

27. The display panel according to any one of claims 1 to 26, characterized in that, The wavelength of the emission color of either the first light-emitting part or the second light-emitting part is outside the absorption spectrum range of the other light-emitting part.

28. The display panel according to any one of claims 1 to 26, characterized in that, The light-emitting area of ​​the first light-emitting part is the same as the light-emitting area of ​​the second light-emitting part; or... The difference between the light-emitting area of ​​the first light-emitting part and the light-emitting area of ​​the second light-emitting part is less than or equal to 2% of the light-emitting area of ​​either the first light-emitting part or the second light-emitting part.

29. The display panel according to any one of claims 1 to 26, characterized in that, The second electrode is a transparent electrode or a semi-transparent and semi-reflective electrode, and the third electrode is a transparent electrode or a semi-transparent and semi-reflective electrode.

30. The display panel according to any one of claims 1 to 26, characterized in that, The light-emitting unit includes a first light-emitting unit and a second light-emitting unit. The second light-emitting part of the first light-emitting unit and the second light-emitting part of the second light-emitting unit are both first color light-emitting parts, the first light-emitting part of the first light-emitting unit is a second color light-emitting part, and the first light-emitting part of the second light-emitting unit is a third color light-emitting part.

31. The display panel according to claim 30, characterized in that, The second light-emitting part of the first light-emitting unit and the second light-emitting part of the second light-emitting unit are blue light-emitting parts, the first light-emitting part of the first light-emitting unit is red light-emitting part, and the second light-emitting part of the second light-emitting unit is green light-emitting part.

32. The display panel according to claim 31, characterized in that, The sheet resistance of the second electrode of the first light-emitting unit is less than the sheet resistance of the second electrode of the second light-emitting unit; and / or, The work function of the material of the second electrode of the first light-emitting unit is greater than the work function of the material of the second electrode of the second light-emitting unit.

33. The display panel according to claim 31, characterized in that, In the light-emitting unit, the distance between the two electrodes adjacent to the blue light-emitting part is 1850A, the distance between the two electrodes adjacent to the green light-emitting part is 2400A, and the distance between the two electrodes adjacent to the red light-emitting part is 2900A.

34. The display panel according to any one of claims 1 to 26, characterized in that, The sheet resistance of the material of the second electrode is less than or equal to 10 Ω / cm 2 ; and / or, The work function of the material of the second electrode is in the range of 3eV to 5eV.

35. The display panel according to any one of claims 1 to 26, characterized in that, The material of the second electrode includes one of transparent oxide, elemental metal, or metal compound.

36. The display panel according to any one of claims 10-13, 15-21, characterized in that, The display panel also includes: An inorganic encapsulation layer is disposed on the side of the isolation structure away from the substrate; the inorganic encapsulation layer includes a plurality of inorganic encapsulation portions, which are interconnected to form an integral structure, and at least a portion of each inorganic encapsulation portion is located within a fourth opening and covers a third electrode.

37. The display panel according to any one of claims 10-14, 16-21, characterized in that, The display panel also includes: An inorganic encapsulation layer is disposed on the side of the isolation structure away from the substrate; the inorganic encapsulation layer includes a plurality of inorganic encapsulation portions, the plurality of inorganic encapsulation portions are spaced apart from each other, and at least a portion of each inorganic encapsulation portion is located within one of the fourth openings and covers one of the third electrodes.

38. The display panel according to any one of claims 10 to 21, characterized in that, The display panel also includes: A fourth conductive pattern is disposed on the side of the isolation structure away from the substrate; the fourth conductive pattern is located on the second isolation portion of the isolation structure, and the fourth conductive pattern and the third electrode are formed in the same film layer; An auxiliary electrode is disposed within the fourth opening; the auxiliary electrode covers a portion of the sidewall of the fourth opening and is connected to the third electrode.

39. The display panel according to any one of claims 1 to 26, characterized in that, When the first light-emitting part and the second light-emitting part are configured to emit light with the same brightness. The driving voltage of the first light-emitting part is the same as the driving voltage of the second light-emitting part; or, The difference between the driving voltage of the first light-emitting part and the driving voltage of the second light-emitting part is less than or equal to 10% of the driving voltage of either the first light-emitting part or the second light-emitting part.

40. The display panel according to any one of claims 1 to 26, characterized in that, The display panel has a pixel density greater than or equal to 1500ppi.

41. An electronic device, characterized in that, include: The display panel as described in any one of claims 1 to 40; and, The driving circuit is connected to the display panel.

Images