Display module and electronic equipment

Abstract

The embodiment of the invention provides a display module and electronic equipment, the display module comprises a substrate, a pixel defining layer arranged on the substrate and an isolation structure arranged on the pixel defining layer, the display module further comprises a plurality of light-emitting sub-pixels, each light-emitting sub-pixel comprises a functional layer, and the functional layer is arranged on the substrate. The plurality of light-emitting sub-pixels comprise a first light-emitting sub-pixel and a second light-emitting sub-pixel, and the function layer of the adjacent first light-emitting sub-pixel and the function layer of the adjacent second light-emitting sub-pixel are separated by the isolation structure; wherein the first light-emitting sub-pixel is a red light-emitting sub-pixel, and the second light-emitting sub-pixel is a green light-emitting sub-pixel or a blue light-emitting sub-pixel. Therefore, the red light-emitting sub-pixel is separated from the light-emitting sub-pixels of other colors through the isolation structure, the current of the light-emitting sub-pixels of other colors can be prevented from lightening the red light-emitting sub-pixel, and crosstalk is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular to a display module and an electronic device. Background Art

[0002] Currently, organic light-emitting diode (OLED) based display screens are widely used, for example, in various electronic devices such as mobile phones, tablets, computers, televisions, and watches.

[0003] The OLED display module includes: a substrate, and a plurality of pixel areas arranged on the substrate, each of the pixel areas includes a red light-emitting sub-pixel, a green light-emitting sub-pixel and a blue light-emitting sub-pixel.

[0004] Current OLED display modules typically use a high-precision metal mask (Fine Metal Mask, FMM) for patterned vapor deposition of light-emitting sub-pixels to achieve full color. However, for cost considerations, only the light-emitting layer and electron blocking layer in the OLED display module are patterned. Other layers, such as the hole injection layer (HIL), electron generation layer (N-CGL) and hole generation layer (P-CGL), are still evaporated using a common metal mask (CMM) and are common layers.

[0005] However, the HIL layer, N-CGL layer, and P-CGL layer have relatively strong conductive properties and are all common layers. Therefore, when pixels of a certain color are lit, pixels of other colors are lit through lateral current, resulting in color difference and crosstalk. Summary of the Invention

[0006] The embodiments of the present application provide a display module and an electronic device that solve the problem of crosstalk generated by light-emitting sub-pixels of different colors.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] In a first aspect of the present application, a display module is provided, comprising a substrate, a pixel defining layer disposed on the substrate, and an isolation structure disposed on the pixel defining layer. The display module further comprises a plurality of light-emitting sub-pixels, each light-emitting sub-pixel comprising a functional layer, the plurality of light-emitting sub-pixels comprising a first light-emitting sub-pixel and a second light-emitting sub-pixel, the functional layers of the adjacent first light-emitting sub-pixels and the functional layers of the second light-emitting sub-pixels being separated by the isolation structure; wherein the first light-emitting sub-pixel is a red light-emitting sub-pixel, and the second light-emitting sub-pixel is a green light-emitting sub-pixel or a blue light-emitting sub-pixel. Thus, the red light-emitting sub-pixel is separated from the light-emitting sub-pixels of other colors by the isolation structure, thereby preventing the current of the light-emitting sub-pixels of other colors from lighting up the red light-emitting sub-pixel and reducing crosstalk. In addition, there is no significant crosstalk between the blue light-emitting sub-pixels and the green light-emitting sub-pixels. The present application only isolates the red light-emitting sub-pixels, thereby achieving a better crosstalk optimization effect. Moreover, the isolation structure only isolates the red light-emitting sub-pixels, thereby reducing the cathode cross-voltage and reducing the panel power consumption.

[0009] In an optional implementation, the isolation structure is provided around the first light-emitting sub-pixel. Thus, providing the isolation structure around the first light-emitting sub-pixel can improve the isolation effect.

[0010] In an optional implementation, an isolation structure is provided at the vertex of the first light-emitting sub-pixel. Thus, providing the isolation structure at the vertex of the first light-emitting sub-pixel can further improve the isolation effect.

[0011] In one optional implementation, the isolation structure includes: an isolation column or an isolation trench. Thus, when the isolation structure utilizes an isolation column, the stack height on the isolation column is higher than the stack height at other locations on the retaining wall, resulting in a step difference between the stack on the isolation column and the stack at other locations on the retaining wall. This can block the path for lateral leakage, thereby reducing crosstalk. When the isolation structure utilizes an isolation trench, the stack height on the isolation trench is lower than the stack height at other locations on the retaining wall. This can block the path for lateral leakage, thereby reducing crosstalk.

[0012] In one optional implementation, the functional layer includes a first functional layer and a second functional layer, the first functional layer being disposed on the pixel-defining layer, and the second functional layer being disposed on the isolation structure. Thus, the first and second functional layers form a step, blocking lateral leakage paths and reducing crosstalk between the first and second light-emitting sub-pixels.

[0013] In one optional implementation, the first and second functional layers each include a hole injection layer, a hole transport layer, and a first electrode. Thus, the isolation structure can separate the hole injection layer, hole transport layer, and first electrode of the first and second light-emitting sub-pixels, blocking lateral leakage paths and reducing crosstalk between the first and second light-emitting sub-pixels.

[0014] In an optional implementation, the first and second functional layers are formed by full-layer evaporation. Thus, the first and second functional layers are formed by full-layer evaporation using a common metal mask, which can reduce costs. During full-layer evaporation using a common metal mask, a step is formed between the laminated portion at the isolation structure and the portions at other locations on the pixel definition layer, blocking lateral leakage paths and reducing crosstalk.

[0015] In one optional implementation, the pixel-defining layer includes a plurality of vertical and horizontal intersecting walls and a plurality of openings defined by the walls. The functional layer further includes a third functional layer disposed within the openings. Thus, the third functional layer is separated by the pixel-defining layer to form a plurality of light-emitting sub-pixels.

[0016] In an optional implementation, the third functional layer includes a light-emitting layer, an electron blocking layer, and a second electrode. Thus, the light-emitting layer, the electron blocking layer, and the second electrode are formed in the opening of the pixel defining layer, thereby preventing crosstalk between different light-emitting sub-pixels.

[0017] In an optional implementation, the third functional layer is formed in the opening by evaporation using a metal mask. Thus, the light-emitting layer, electron blocking layer, and second electrode are formed by evaporation using a high-precision metal mask, thereby achieving full-color display module.

[0018] In one optional implementation, the red, green, and blue sub-pixels further include: a second light-emitting layer, an electron generation layer, and a hole generation layer; the second light-emitting layer is located between the first light-emitting layer and the electron transport layer, and the electron generation layer and the hole generation layer are located between the first light-emitting layer and the second light-emitting layer; the electron generation layer is disposed adjacent to the first light-emitting layer, and the hole generation layer is disposed adjacent to the second light-emitting layer. Thus, the light-emitting layers adopt a laminated structure, which can increase service life and improve efficiency.

[0019] In one optional implementation, the first and second functional layers further include an electron generation layer and a hole generation layer, respectively. This allows the other layers to be formed by full-layer evaporation using a common metal mask, reducing costs. During full-layer evaporation using a common metal mask, a step is formed between the laminated portion at the isolation structure and the portions elsewhere in the pixel definition layer, blocking lateral leakage paths and reducing crosstalk.

[0020] In an optional implementation, the third functional layer further includes a second luminescent layer, which is formed in the opening by vapor deposition using a high-precision metal mask. This enables a full-color display module.

[0021] In a second aspect of the present application, an electronic device is provided, comprising a cover plate and the display module described above, wherein the cover plate is disposed on the display module. Thus, the electronic device employing the display module can block lateral leakage paths to reduce crosstalk.

[0022] The third aspect of the present application provides a method for preparing a display module, the method comprising: forming a pixel defining layer on a substrate; forming an isolation structure on the pixel defining layer; forming a plurality of light-emitting sub-pixels on the pixel defining layer and the isolation structure, each light-emitting sub-pixel comprising a functional layer, the plurality of light-emitting sub-pixels comprising a first light-emitting sub-pixel and a second light-emitting sub-pixel, the functional layers of the adjacent first light-emitting sub-pixels and the functional layers of the second light-emitting sub-pixels being separated by the isolation structure, wherein the first light-emitting sub-pixel is a red light-emitting sub-pixel, and the second light-emitting sub-pixel is a green light-emitting sub-pixel or a blue light-emitting sub-pixel.

[0023] The embodiment of the present application provides a display module and electronic device, the display module comprising: a substrate, a pixel defining layer disposed on the substrate, and an isolation structure disposed on the pixel defining layer, the display module further comprising a plurality of light-emitting sub-pixels, each light-emitting sub-pixel comprising a functional layer, the plurality of light-emitting sub-pixels comprising a first light-emitting sub-pixel and a second light-emitting sub-pixel, the functional layers of adjacent first light-emitting sub-pixels and second light-emitting sub-pixels being separated by the isolation structure; wherein the first light-emitting sub-pixel is a red light-emitting sub-pixel, and the second light-emitting sub-pixel is a green light-emitting sub-pixel or a blue light-emitting sub-pixel. Thus, the red light-emitting sub-pixel is separated from the light-emitting sub-pixels of other colors by the isolation structure, thereby preventing the current of the light-emitting sub-pixels of other colors from lighting up the red light-emitting sub-pixel and reducing crosstalk. In addition, there is no significant crosstalk between the blue light-emitting sub-pixels and the green light-emitting sub-pixels. The present application only isolates the red light-emitting sub-pixels, thereby achieving a better crosstalk optimization effect. Moreover, the isolation structure only isolates the red light-emitting sub-pixels, thereby reducing the cathode cross-voltage and reducing the panel power consumption.

[0024] In some embodiments, the isolation structure can be an isolation column or isolation groove arranged on the retaining wall around the red light-emitting sub-pixel, so that there is a step difference between the stacking height on the isolation structure and the stacking height at other positions of the retaining wall, which can block the lateral leakage path to reduce crosstalk. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic diagram of the disassembled structure of an electronic device;

[0026] Figure 2 A schematic diagram of the arrangement of light-emitting sub-pixels of a display module;

[0027] Figure 3 A cross-sectional view of a display module;

[0028] Figure 4 is another cross-sectional view showing a module;

[0029] Figure 5 This is a schematic diagram of the arrangement of an isolation structure;

[0030] Figure 6 Schematic diagram of another isolation structure arrangement

[0031] Figure 7 A schematic diagram of the spectra of light-emitting sub-pixels of different colors provided in an embodiment of the present application;

[0032] Figure 8 A schematic diagram of lateral leakage between light-emitting sub-pixels;

[0033] Figure 9 A schematic diagram of the arrangement of the first isolation structure provided in an embodiment of the present application;

[0034] Figure 10 A schematic diagram of current flow between light-emitting sub-pixels provided in an embodiment of the present application;

[0035] Figure 11 A cross-sectional schematic diagram of a first display module provided in an embodiment of the present application;

[0036] Figure 12 A schematic diagram of another current flow between light-emitting sub-pixels provided in an embodiment of the present application;

[0037] Figure 13 A cross-sectional schematic diagram of a second display module provided in an embodiment of the present application;

[0038] Figure 14 A schematic cross-sectional view of a third display module provided in an embodiment of the present application;

[0039] Figure 15 A schematic cross-sectional view of a fourth display module provided in an embodiment of the present application;

[0040] Figure 16 A schematic diagram of the arrangement of the second isolation structure provided in an embodiment of the present application;

[0041] Figure 17 A schematic diagram of the arrangement of the third isolation structure provided in an embodiment of the present application;

[0042] Figure 18 This is a schematic diagram of the arrangement of the fourth isolation structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0044] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In addition, in this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0046] The embodiment of the present application provides an electronic device. The electronic device can be a product with a display interface such as a tablet computer, a mobile phone, an e-reader, a remote control, a personal computer (PC), a laptop computer, a personal digital assistant (PDA), a vehicle-mounted device, an Internet TV, a wearable device, a television, and a smart display wearable product such as a smart watch and a smart bracelet. The embodiment of the present application does not impose any special restrictions on the form of the above-mentioned electronic device. For the convenience of explanation, the following embodiments are all exemplified by taking the electronic device as a mobile phone.

[0047] like Figure 1 As shown, the electronic device 1 includes a display module 10, a middle frame 11, and a battery cover (or rear housing) 12. The middle frame 11 is located between the display module 10 and the battery cover 12.

[0048] The display module 10 is used to display images.

[0049] The display module 10, midframe 11, and battery cover 12 can be arranged in different layers along the thickness direction of the electronic device. These layers can be parallel to each other. The plane in which each layer lies can be called the XY plane, and the direction perpendicular to the XY plane can be called the Z direction. In other words, the display module 10, midframe 11, and battery cover 12 can be arranged in layers along the Z direction.

[0050] The display module 10 can be Figure 1 The flexible printed circuit (FPC) shown passes through the middle frame 11 and is electrically connected to the PCB disposed on the middle frame 11. This allows the PCB to transmit display data to the display module 10 to control the display module 10 to display images.

[0051] The middle frame 11 is located between the display module 10 and the battery cover 12. The surface of the middle frame 11, facing away from the display module 10, is used to mount internal components such as the battery, printed circuit board (PCB), camera, and antenna. When the battery cover 12 and middle frame 11 are closed, these internal components are located between the battery cover 12 and the middle frame 11.

[0052] The battery cover 12 is connected to the middle frame 11 to form a cavity for accommodating the above-mentioned PCB, camera, battery and other electronic components, thereby preventing external moisture and dust from invading the cavity and affecting the performance of the above-mentioned electronic components.

[0053] In some embodiments of the present application, Figure 2 As shown, in some embodiments of the present application, Figure 2 As shown, the display module 10 may include a substrate 101 , and the substrate 101 is divided into a plurality of pixel regions P.

[0054] In order to enable the display module 10 to achieve color display, in some embodiments of the present application, such as Figure 2 As shown, each luminescent pixel region p includes at least three luminescent sub-pixels 103 for displaying three primary colors. The three primary colors can be red (R), green (G), and blue (B). For example, each luminescent pixel region p includes a red luminescent sub-pixel R for emitting red light, a green luminescent sub-pixel G for emitting green light, and a blue luminescent sub-pixel B for emitting blue light.

[0055] In some embodiments, the arrangement of the R, G, and B primary color light-emitting sub-pixels 103 can be determined based on the display effect, pixel density (pixels per inch (PPI)), and resolution, and is not limited in this application. For example, the pixel arrangement of the display module 10 can also be a Pentile pixel arrangement (also called a P arrangement), a Delta pixel arrangement (also called a D arrangement), or a Diamond arrangement.

[0056] by Figure 2 Taking the arrangement of sub-pixels shown in FIG as an example, the emitting sub-pixels arranged in a row along the horizontal direction x are called emitting sub-pixels in the same row. The emitting sub-pixels arranged in a row along the vertical direction y are called emitting sub-pixels in the same column. Figure 2 As shown, the light-emitting sub-pixels in the same column emit light of the same color. For example, all the light-emitting sub-pixels in the same column are red light-emitting sub-pixels R. Each light-emitting sub-pixel and the adjacent light-emitting sub-pixels in the same row emit light of different colors. For example, the red light-emitting sub-pixels R, green light-emitting sub-pixels G, and blue light-emitting sub-pixels B are arranged alternately along the x-direction.

[0057] For the convenience of explanation, the plurality of light-emitting sub-pixels 103 in this application are Figure 2 The shape and arrangement of the light-emitting sub-pixels 103 shown in the present application are for illustration only and are not intended to be limiting.

[0058] In some embodiments, as Figure 3 As shown, the display module 10 includes a substrate 101 and a plurality of light-emitting sub-pixels 103 disposed on the substrate 101. The light-emitting sub-pixels include a driving circuit (not shown) and an OLED (light-emitting device) electrically connected to the driving circuit. The driving circuit is used to control the light-emitting device to display.

[0059] The substrate 101 may be a transparent glass substrate, or a hard or flexible substrate made of a transparent resin material. Thus, a TFT (Thin Film Transistor) may be fabricated on the substrate 101, and the driving circuit serves as a TFT backplane.

[0060] Alternatively, a driving circuit may be formed directly on the substrate through a patterning process. In this case, the driving circuit is a pixel circuit.

[0061] For example, in a possible embodiment, the driving circuit includes a capacitor, a plurality of switching transistors, and a driving circuit.

[0062] In another possible embodiment, the driving circuit includes a capacitor, a switching transistor, and a driving transistor.

[0063] In other embodiments, the driving circuit may also have other structures, and the driving circuit in the embodiment of the present application is only an illustration.

[0064] In some embodiments, the display module further includes a pixel defining layer 102 , which is disposed on the surface of the substrate 101 . The pixel defining layer 102 is used to prevent light emitted from adjacent light-emitting sub-pixels 103 from mixing.

[0065] In some embodiments, the pixel defining layer 102 may be made of an insulating material, such as silicon dioxide, silicon nitride, or silicon oxynitride.

[0066] like Figure 3 As shown, the pixel defining layer 102 includes a plurality of vertical and horizontal intersecting retaining walls 1021 and a plurality of openings 1022 surrounded by the vertical and horizontal intersecting retaining walls 1021 , and one opening 1022 corresponds to one light-emitting sub-pixel 103 .

[0067] The following combination Figure 3 The stacking arrangement of the driving circuit and the light-emitting sub-pixel 103 in the display module 10 is described as follows. Figure 3 As shown, the light-emitting sub-pixel 103 is arranged on the side of the driving circuit away from the substrate 101. The light-emitting sub-pixel 103 includes at least: an organic light-emitting layer (emitting material layer, EML) 1031, a first electrode 1032 and a second electrode 1033. The first electrode 1032 is arranged near the driving circuit, and the light-emitting material layer 1031 is located between the first electrode 1032 and the second electrode 1033.

[0068] In some embodiments of the present application, the first electrode 1032 is an anode (anodic, a), and the second electrode 1033 is a cathode (cathode, c).

[0069] In some embodiments, the first electrode 1032 is a laminated structure composed of indium tin oxide / silver / indium tin oxide (ITO / Ag / ITO), with the silver layer being a fully reflective layer. In other embodiments, the first electrode 1032 may include other metal materials or alloy materials with good conductivity, and the first electrode 1032 may also be a film layer structure with other fully reflective properties.

[0070] In some embodiments, after the driving circuit applies a voltage to the first electrode 1032 and the second electrode 1033, carriers in the first electrode 1032 and the second electrode 1033 meet in the light-emitting material layer 1031 and excite photons, thereby causing the light-emitting material layer 1031 to emit light. At this time, the light-emitting sub-pixels 103 emit light, and the display module 10 having multiple light-emitting sub-pixels 103 displays an image.

[0071] The light-emitting material layer 1031 includes a red light-emitting layer 1031R that emits red light, a green light-emitting layer 1031G that emits green light, and a blue light-emitting layer 1031B that emits blue light.

[0072] The second electrode 1033 can be laid flat on the plurality of light-emitting sub-pixels 103 arranged in an array. The second electrode 1033 has a semi-transmissive and semi-reflective effect on light. In one embodiment, the material of the second electrode 1033 is one or more of ytterbium (Yb), calcium (Ca), magnesium (Mg), silver (Ag), or alloys thereof. Preferably, the material is an MgAg alloy with a molar ratio of 1:10.

[0073] In some embodiments, the light-emitting sub-pixel 103 further includes: a hole transport layer (HTL) 1035 , an electron barrier layer (EBL) 1036 , a hole barrier layer (HBL) 1037 , and an electron transport layer (ETL) 1038 .

[0074] The hole transport layer 1035 and the electron blocking layer 1036 are sequentially stacked along the z direction between the first electrode 1032 and the light emitting material layer 1031. The hole transport layer 1035 is disposed on a surface of the first electrode 1032 away from the substrate 101.

[0075] The hole blocking layer 1037 and the electron transport layer 1038 are sequentially stacked along the z direction between the light emitting material layer 1031 and the second electrode 1033 , wherein the hole blocking layer 1037 is disposed on the surface of the light emitting material layer 1031 away from the substrate 101 .

[0076] The hole transport layer 1035 may be made of a material having high hole mobility, high thermal stability, and good electron and exciton blocking capabilities. In one embodiment, the material of the hole transport layer 1035 is an organic small molecule material.

[0077] The electron transport layer 1038 is made of a material having high electron mobility, high thermal stability, and good hole and exciton blocking capabilities.

[0078] The light-emitting material layer 1031 includes a red organic light-emitting layer, a green organic light-emitting layer, and a blue organic light-emitting layer.

[0079] When an operating voltage is applied to the first electrode 1032 and the second electrode 1033, the holes in the first electrode 1032 and the electrons in the second electrode 1033 are injected into the light-emitting material layer 1031. The holes and electrons meet in the light-emitting material layer 1031, and the two are combined to form electron-hole pairs and release energy. The energy is emitted in the form of light, and is displayed as light of different colors after passing through different photons in the light-emitting material layer 1031, and is emitted evenly from both sides of the light-emitting material layer 1031.

[0080] In some embodiments, in order to improve the efficiency of injecting electrons and holes into the light-emitting material layer, the light-emitting sub-pixel 103 may also include an electron injection layer (EIL) 1039 arranged between the second electrode 1033 and the electron transport layer 1038, and a hole injection layer 1034 arranged between the hole transport layer 1035 and the first electrode 210.

[0081] In some embodiments, the light-emitting sub-pixel 103 further includes a coupling layer (CPL) and a thin film encapsulation (TFE) layer. The coupling layer is located on a surface of the second electrode 1033 away from the substrate 101, and the thin film encapsulation layer is located on a surface of the coupling layer away from the second electrode 1033.

[0082] The coupling layer can be used to converge light and improve the forward light extraction efficiency.

[0083] The thin film encapsulation layer can be used to encapsulate the display module to prevent external water and oxygen from entering the light-emitting sub-pixel 103. The thin film encapsulation layer includes, for example, a first inorganic layer, a second inorganic layer, and an organic layer located between the first inorganic layer and the second inorganic layer.

[0084] In some embodiments, the first electrode 1032 , the electron blocking layer 1036 and the light-emitting material layer 1031 are subjected to RGB patterned evaporation using a high-precision metal mask (Fine Metal Mask, FMM), thereby achieving full color.

[0085] Other layers, such as the hole injection layer 1034 , the hole transport layer 1035 , the hole blocking layer 1037 , the electron transport layer 1038 , the electron injection layer 1039 and the second electrode 1033 , are all deposited using a common metal mask (CMMmask) and are common layers.

[0086] In some embodiments, the light-emitting sub-pixel may adopt a tandem structure, including two light-emitting layers, each of which includes: a hole transport layer, a light-emitting material layer, and an electron transport layer. For example, Figure 4 As shown, the light-emitting layer includes a first light-emitting layer 1030a and a second light-emitting layer 1030b stacked along the z direction.

[0087] For example, Figure 4 As shown, the first light-emitting layer 1030a includes: a first hole transport layer 1035a, a first light-emitting material layer 1031a and a first electron transport layer 1038a.

[0088] In some embodiments, the first light emitting layer 1030a further includes a first electron blocking layer 1036a and a first hole blocking layer 1037a.

[0089] The second light-emitting layer 1030b includes a second hole transport layer 1035b, a second light-emitting material layer 1031b and a second electron transport layer 1038b.

[0090] In some other embodiments, the second light-emitting layer further includes: a second electron blocking layer 1036b and a second hole blocking layer 1037b.

[0091] Therefore, the first light-emitting layer 1030a and the second light-emitting layer 1030b both include multiple functional layers, thereby improving the light-emitting efficiency and lifespan of the light-emitting sub-pixels.

[0092] In some embodiments, the first hole blocking layer 1037a, the first electron transport layer 1038a, the second hole transport layer 1035b, and the second electron blocking layer 1036b are sequentially stacked between the first light-emitting material layer 1031a and the second light-emitting material layer 1031b. The first hole transport layer 1035a and the first electron blocking layer 1036a are sequentially stacked along the z-direction between the first electrode 1032 and the first light-emitting material layer 1031a. The second electron transport layer 1038b and the second hole blocking layer 1037b are located between the second hole light-emitting material layer 1031b and the electron injection layer 1039.

[0093] In some embodiments, the light-emitting sub-pixel 103 with a stacked structure further includes an electron generation layer 104 and a hole generation layer 105 , which are located between the first electron transport layer 1038 a and the second hole transport layer 1035 b .

[0094] The electron generation layer 104 is used to generate charges. The hole generation layer 105 is used to generate holes. Thus, by providing the electron generation layer and the hole generation layer between the two light-emitting layers, more holes and electrons can be generated, further improving the light-emitting efficiency.

[0095] The light-emitting sub-pixel provided in this embodiment adopts a stacked structure, which can increase service life and improve usage efficiency.

[0096] However, the hole injection layer 1034, the electron generation layer 104 and the hole generation layer 105 have relatively strong conductive properties and are all common layers. Therefore, when pixels of a certain color are lit, pixels of other colors are lit through lateral current, resulting in color difference and crosstalk.

[0097] To reduce crosstalk, in some embodiments, the conductivity of the hole injection layer 1034 , the electron generation layer 104 , and the hole generation layer 105 can be reduced by optimizing material selection and doping concentration, thereby reducing lateral current.

[0098] In other embodiments, Figure 5 、 Figure 6 As shown, an isolation structure 1020 can be set between different light-emitting sub-pixels 103. For example, an isolation structure 1020 can be set around each light-emitting sub-pixel 103 to block the path of lateral leakage to reduce crosstalk. However, while the isolation structure 1020 blocks lateral leakage (crosstalk is reduced by 50%), it also Figure 3 、 Figure 4 The second electrode 1033 is partially cut off, which increases the impedance of the second electrode 1033 , causing the cross voltage to increase by about 0.5 V and the power consumption to increase by about 7%.

[0099] Figure 7 Schematic diagram of the spectrum of different colors of luminous sub-pixels provided in the embodiment of the present application. The spectrum diagram is a pure color spectrum diagram at a brightness of 500 nits and 48 grayscales. Among them, line B represents the spectrum diagram of a pure blue screen, line R represents the spectrum diagram of a pure red screen, and line G represents the spectrum diagram of a pure green screen. Figure 7 As shown, when the blue or green sub-pixel is turned on, the spectrum has a bump at 620nm (ie, the spectrum of the red sub-pixel), indicating that there is a red peak in the blue and green spectra.

[0100] Based on this, Figure 8 As shown, when the blue or green sub-pixel B is lit, current flows through the blue or green sub-pixel B to the red sub-pixel R, lighting up the red sub-pixel R. However, there is no significant crosstalk between the blue and green sub-pixels B (the blue spectrum has no green peak, and the green spectrum has no blue peak). Thus, only the red sub-pixel needs to be isolated to achieve a better crosstalk optimization effect.

[0101] To this end, the embodiments of the present application provide an improved display module, which reduces the cross-voltage and power consumption while ensuring the crosstalk effect by reducing the number of isolation columns or isolation grooves and designing a reasonable isolation column or isolation groove pattern.

[0102] Figure 9 This is a schematic diagram of the structure of a display module provided in an embodiment of the present application. Figure 9 As shown, the display module includes a substrate 101, an isolation structure 1020, and a plurality of light-emitting sub-pixels 103, wherein the plurality of light-emitting sub-pixels include a first light-emitting sub-pixel 103a and a second light-emitting sub-pixel 103b, and the adjacent first light-emitting sub-pixels 103a and the second light-emitting sub-pixels 103b are separated by the isolation structure 1020.

[0103] The first light-emitting sub-pixel 103 a is a red light-emitting sub-pixel R, and the second light-emitting sub-pixel 103 b is a green light-emitting sub-pixel G or a blue light-emitting sub-pixel B.

[0104] Among them, through simulation, we can know that Figure 5 As shown, compared with setting an isolation structure around each light-emitting sub-pixel, the cross-voltage drops by 0.35V, the power consumption is improved by about 5%, and the crosstalk is optimized by about 50%.

[0105] Therefore, an isolation structure is provided around the red light-emitting sub-pixel, and a better crosstalk optimization effect can be achieved by only isolating the red light-emitting sub-pixel.

[0106] In some embodiments, as Figure 10 、 Figure 12 As shown, the display module further includes: a pixel defining layer 102 , wherein the pixel defining layer 102 is disposed on the surface of the substrate 101 , and an isolation structure 1020 is disposed on the pixel defining layer 102 .

[0107] The following combination Figure 10-13 The setting method of the isolation structure is described.

[0108] In some embodiments, the pixel defining layer 102 includes an isolation structure 1020, each light-emitting sub-pixel 103 includes a functional layer 100, and the functional layer of the adjacent first light-emitting sub-pixel 103a and the functional layer of the second light-emitting sub-pixel 103b are separated by the isolation structure. The functional layer 100 includes a first functional layer 100a and a second functional layer 100b, wherein the first functional layer 100a is disposed on the pixel defining layer, and the second functional layer 100b is disposed on the isolation structure 1020. In some embodiments, as Figure 10 、 Figure 11 As shown, the isolation structure 1020 may be an isolation column 1020a. In other embodiments, such as Figure 12 、 Figure 13As shown, the isolation structure 1020 may be an isolation trench 1020b.

[0109] When preparing the display module, a pixel defining layer 102 can be first formed on the substrate, and then an isolation structure 1020 can be formed on the pixel defining layer 102, and a plurality of light-emitting sub-pixels 103 can be formed on the pixel defining layer 102 and the isolation structure 1020. Each light-emitting sub-pixel 103 includes a functional layer 100, and the functional layer of the adjacent first light-emitting sub-pixel 103a and the functional layer of the second light-emitting sub-pixel 103b are separated by the isolation structure. The functional layer 100 includes: a first functional layer 100a and a second functional layer 100b. The first functional layer 100a is formed on the pixel defining layer, and the second functional layer 100b is formed on the isolation structure 1020.

[0110] like Figure 10 As shown, the pixel defining layer 102 further includes a plurality of horizontally and vertically intersecting retaining walls 1021 and a plurality of openings 1022 defined by the plurality of horizontally and vertically intersecting retaining walls 1021. Each opening 1022 corresponds to a light-emitting sub-pixel 103. The red, green, and blue light-emitting sub-pixels are all disposed within the openings 1022. Thus, by providing retaining walls between adjacent light-emitting sub-pixels, crosstalk between different light-emitting sub-pixels can be avoided.

[0111] Among them, Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 As shown, the isolation structure 1020 can be provided in the red light emitting sub-pixel R ( Figure 11 、 Figure 13 When the isolation structure 1020 is an isolation column 1020a, the isolation structure 1020 is a protrusion provided on the surface of the retaining wall 1021. When the isolation structure 1020 is an isolation groove 1020b, the isolation structure 1020 is a groove formed in the retaining wall 1021.

[0112] The forming of the pixel defining layer 102 on the substrate includes forming a plurality of horizontally and vertically intersecting retaining walls 1021 on the substrate, wherein the plurality of horizontally and vertically intersecting retaining walls 1021 are arranged to form a plurality of openings 1022 .

[0113] Forming an isolation structure 1020 on the pixel defining layer 102 includes providing an isolation structure on the retaining wall. The isolation structure 1020 separates the functional layer of the first light-emitting sub-pixel 103a from the functional layer of the second light-emitting sub-pixel 103b. In this manner, when forming the light-emitting sub-pixels 103 using a mask, a display module provided with the isolation structure 1020 creates a step between the stacked layers on the isolation structure 1020 and those elsewhere, thereby blocking lateral leakage paths and reducing crosstalk.

[0114] The present application does not limit the structure of the functional layer. In some embodiments, the functional layer includes a first functional layer and a second functional layer, wherein the first functional layer and the second functional layer may be a common layer separated by an isolation structure. Thus, the isolation structure can separate the first functional layer and the second functional layer, blocking the path for lateral leakage, and reducing crosstalk between the first and second light-emitting sub-pixels.

[0115] In some embodiments, the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B each include a light-emitting material layer 1031, a first electrode 1032, and a second electrode 1033. In some embodiments of the present application, the first electrode 1032 is an anode, and the second electrode 1033 is a cathode.

[0116] In some embodiments, the light-emitting sub-pixel 103 further includes: a hole transport layer 1035 , an electron blocking layer 1036 , a hole blocking layer 1037 , and an electron transport layer 1038 .

[0117] In some embodiments, in order to improve the efficiency of injecting electrons and holes into the light-emitting material layer, the light-emitting sub-pixel 103 may also include an electron injection layer 1039 arranged between the second electrode 1033 and the electron transport layer 1038, and a hole injection layer 1034 arranged between the hole transport layer 1035 and the first electrode 210.

[0118] Among them, the hole injection layer 1034, the hole transport layer 1035, the hole blocking layer 1037, the electron transport layer 1038, the electron injection layer 1039 and the second electrode 1033 are all formed by full-layer evaporation through a common metal mask.

[0119] Thus, when the hole injection layer 1034, hole transport layer 1035, hole blocking layer 1037, electron transport layer 1038, electron injection layer 1039, and second electrode 1033 are formed by full-layer evaporation through a common metal mask, two functional layers are formed: a first functional layer 100a formed on the pixel definition layer, and a second functional layer 100b formed on the isolation structure 1020. The step formed between the second functional layer 100b on the isolation structure 1020 and the first functional layer 100a on the pixel definition layer blocks lateral leakage paths, thereby reducing crosstalk.

[0120] Therefore, the first functional layer and the second functional layer are formed by vapor deposition of the entire layer using a common metal mask, which can reduce costs. When the entire layer is vapor deposited using a common metal mask, a step is formed between the laminated portion at the isolation structure and the portion at other positions of the pixel definition layer, thereby cutting off the lateral leakage path and reducing crosstalk.

[0121] For example, Figure 11 As shown, the isolation structure adopts an isolation column 1020a, and the stacking height on the isolation column 1020a is higher than the stacking height at other positions of the retaining wall 1021, so that there is a step difference between the stacking on the isolation column 1020a and the stacking at other positions of the retaining wall 1021, which can block the lateral leakage path to reduce crosstalk.

[0122] Or, as Figure 13 As shown, the isolation structure adopts an isolation groove 1020b, and the stacking height on the isolation groove 1020b is lower than the stacking height at other positions of the retaining wall 1021, so that there is a step difference between the stacking on the isolation groove 1020b and the stacking at other positions of the retaining wall 1021, which can isolate the lateral leakage path to reduce crosstalk.

[0123] In some embodiments, the functional layer 100 further includes a third functional layer. The third functional layer may be a functional layer formed in the opening. The third functional layer includes a first electrode 1032, an electron blocking layer 1036, and a light-emitting material layer 1031. The first electrode 1032, the electron blocking layer 1036, and the light-emitting material layer 1031 may be formed in the opening by evaporation using a high-precision metal mask. Thus, the light-emitting layer, the electron blocking layer, and the second electrode are formed by evaporation using a high-precision metal mask, so that the light-emitting layer, the electron blocking layer, and the second electrode are formed in the opening of the pixel defining layer and separated by the pixel defining layer to form multiple light-emitting sub-pixels. This can reduce crosstalk between different light-emitting sub-pixels and achieve full color display module.

[0124] In some embodiments, as Figure 14 、 Figure 15 As shown, the red light-emitting sub-pixel, the green light-emitting sub-pixel and the blue light-emitting sub-pixel may adopt a tandem structure, including: a first electrode 1032, a hole injection layer 1034, two light-emitting layers, an electron injection layer 1039 and a second electrode 1033, wherein each light-emitting layer includes: a hole transport layer, a light-emitting material layer and an electron transport layer. For example, Figure 14 、 Figure 15 As shown, the light-emitting layer includes a first light-emitting layer 1030a and a second light-emitting layer 1030b stacked along the z direction.

[0125] The first light-emitting layer 1030a includes a first hole transport layer 1035a, a first light-emitting material layer 1031a and a first electron transport layer 1038a.

[0126] In some embodiments, the first light emitting layer 1030a further includes a first electron blocking layer 1036a and a first hole blocking layer 1037a.

[0127] The second light-emitting layer 1030b includes a second hole transport layer 1035b, a second light-emitting material layer 1031b and a second electron transport layer 1038b.

[0128] In some other embodiments, the second light-emitting layer further includes: a second electron blocking layer 1036b and a second hole blocking layer 1037b.

[0129] Therefore, the first light-emitting layer 1030a and the second light-emitting layer 1030b both include multiple functional layers, thereby improving the light-emitting efficiency and lifespan of the light-emitting sub-pixels.

[0130] In some embodiments, the first hole blocking layer 1037a, the first electron transport layer 1038a, the second hole transport layer 1035b, and the second electron blocking layer 1036b are sequentially stacked between the first light-emitting material layer 1031a and the second light-emitting material layer 1031b. The first hole transport layer 1035a and the first electron blocking layer 1036a are sequentially stacked along the z-direction between the first electrode 1032 and the first light-emitting material layer 1031a. The second electron transport layer 1038b and the second hole blocking layer 1037b are located between the second hole light-emitting material layer 1031b and the electron injection layer 1039.

[0131] In some embodiments, the light-emitting sub-pixel 1030 with a stacked structure further includes: an electron generation layer 104 and a hole generation layer 105 , wherein the electron generation layer 104 and the hole generation layer 105 are located between the first electron transport layer 1038 a and the second hole transport layer 1035 b .

[0132] The electron generation layer 104 is used to generate charges. The hole generation layer 105 is used to generate holes. Thus, by providing the electron generation layer and the hole generation layer between the two light-emitting layers, more holes and electrons can be generated, further improving the light-emitting efficiency.

[0133] The light-emitting sub-pixel provided in this embodiment adopts a stacked structure, which can increase service life and improve usage efficiency.

[0134] In some embodiments, the hole injection layer 1034, the electron generation layer 104, and the hole generation layer 105 are all formed by evaporation through a common metal mask, forming two functional layers: a first functional layer 100a formed on the pixel definition layer, and a second functional layer 100b formed on the isolation structure 1020. The difference in height between the second functional layer 100b at the isolation structure 1020 and the first functional layer 100a on the pixel definition layer blocks the path for lateral leakage, thereby reducing crosstalk. The first light-emitting material layer 1031a, the second light-emitting material layer 1031b, the first electrode 1032, the first electron blocking layer 1036a, and the second electron blocking layer 1036b are formed by evaporation through a high-precision metal mask in the opening, forming a third functional layer.

[0135] The hole injection layer 1034, the electron generation layer 104 and the hole generation layer 105 have relatively strong conductive properties. When they are formed by vapor deposition through a common metal mask, a gap is formed between the stacked portion at the isolation structure 1020 and the portion at other positions of the pixel definition layer, thereby cutting off the lateral leakage path and reducing crosstalk.

[0136] The embodiment of the present application does not limit the arrangement of the isolation structure 1020, as long as the isolation structure 1020 can isolate the red light-emitting sub-pixel from the light-emitting sub-pixels of other colors. Figure 9 、 Figure 16 、 Figure 17 The following compares and illustrates different arrangements of the isolation structure 1020. The light-emitting sub-pixels are arranged in a herringbone pattern to achieve RealRGB display.

[0137] In some embodiments, as Figure 9 As shown, an isolation structure 1020 is provided around the red light-emitting sub-pixel R. The isolation structure 1020 includes: isolation columns and isolation grooves.

[0138] The isolation structure 1020 is about 3 to 10 μm away from the red sub-pixel R, has a width of about 1 to 5 μm, and has a length that is 0 to 3 μm greater than the red sub-pixel R (along the x or y direction).

[0139] The display module adopts Figure 9 As shown, when the isolation structure 1020 is provided around the red light-emitting sub-pixel R, the panel cross-voltage gain is 0.35V, the power consumption gain is about 5%, and the crosstalk optimization is about 50%.

[0140] Therefore, the isolation structure 1020 only isolates the red light-emitting sub-pixel, which can reduce the cathode cross-voltage (IRDrop) and reduce the power consumption of the panel.

[0141] In other embodiments, Figure 16 As shown, isolation structures 1020 are provided around the red light-emitting sub-pixel R, and square isolation structures 1020 are also provided at the four vertices of the figure surrounded by the isolation structures 1020, which can further reduce the lateral current.

[0142] The isolation structure 1020 is about 3 to 10 μm away from the red sub-pixel R, has a width of about 1 to 5 μm, and has a length that is 0 to 3 μm greater than the red sub-pixel R (along the x or y direction).

[0143] The display module adopts Figure 16 As shown, when the isolation structure 1020 is set around the red light-emitting sub-pixel R, the panel cross-voltage gain is 0.30V, the power consumption gain is about 4.3%, and the crosstalk optimization is about 55%.

[0144] Therefore, by providing square isolation columns or isolation grooves at the four vertices of the figure surrounded by the isolation structure 1020 , the lateral current can be further reduced, thereby reducing the crosstalk between the light-emitting sub-pixels.

[0145] In other embodiments, Figure 17 As shown, isolation structures 1020 are provided around the red light-emitting sub-pixel R, and dam-shaped isolation structures 1020 are also provided at the four vertices of the figure surrounded by the isolation structures 1020, which can further reduce the lateral current.

[0146] The isolation structure 1020 is about 3 to 10 μm away from the red sub-pixel R, has a width of about 1 to 5 μm, and has a length that is 0 to 3 μm greater than the red sub-pixel R (along the x or y direction).

[0147] The display module adopts Figure 17 As shown, when the isolation structure 1020 is set around the red light-emitting sub-pixel R, the panel cross-voltage gain is 0.28V, the power consumption gain is about 4%, and the crosstalk optimization is about 60%.

[0148] Therefore, by providing dam isolation columns or isolation grooves at the four vertices of the figure surrounded by the isolation structure 1020, the lateral current can be further reduced, thereby reducing the crosstalk between the light-emitting sub-pixels.

[0149] In other embodiments, Figure 18 As shown, the light-emitting sub-pixels are arranged in diamonds, as shown in Figure 18 As shown, an isolation structure 1020 is provided around the red light-emitting sub-pixel R. The isolation structure 1020 includes: isolation columns and isolation grooves.

[0150] Therefore, the isolation structure 1020 only isolates the red light-emitting sub-pixel, which can reduce the cathode cross-voltage (IRDrop) and reduce the power consumption of the panel.

[0151] The embodiment of the present application provides a display module and electronic device, the display module comprising: a substrate, a pixel defining layer disposed on the substrate, and an isolation structure disposed on the pixel defining layer, the display module further comprising a plurality of light-emitting sub-pixels, each light-emitting sub-pixel comprising a functional layer, the plurality of light-emitting sub-pixels comprising a first light-emitting sub-pixel and a second light-emitting sub-pixel, the functional layers of adjacent first light-emitting sub-pixels and second light-emitting sub-pixels being separated by the isolation structure; wherein the first light-emitting sub-pixel is a red light-emitting sub-pixel, and the second light-emitting sub-pixel is a green light-emitting sub-pixel or a blue light-emitting sub-pixel. Thus, the red light-emitting sub-pixel is separated from the light-emitting sub-pixels of other colors by the isolation structure, thereby preventing the current of the light-emitting sub-pixels of other colors from lighting up the red light-emitting sub-pixel and reducing crosstalk. In addition, there is no significant crosstalk between the blue light-emitting sub-pixels and the green light-emitting sub-pixels. The present application only isolates the red light-emitting sub-pixels, thereby achieving a better crosstalk optimization effect. Moreover, the isolation structure only isolates the red light-emitting sub-pixels, thereby reducing the cathode cross-voltage and reducing the panel power consumption.

[0152] In some embodiments, the isolation structure can be an isolation column or isolation groove arranged on the retaining wall around the red light-emitting sub-pixel, so that there is a step difference between the stacking height on the isolation structure and the stacking height at other positions of the retaining wall, which can block the lateral leakage path to reduce crosstalk.

[0153] The above is only a specific embodiment of the present application, but the scope of protection of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A display module, characterized in that: The display module includes a substrate, a pixel defining layer disposed on the substrate, and an isolation structure disposed on the pixel defining layer. The display module also includes a plurality of light-emitting sub-pixels, each of which includes a functional layer. The plurality of light-emitting sub-pixels include a first light-emitting sub-pixel and a second light-emitting sub-pixel. The functional layers of the adjacent first light-emitting sub-pixels and the functional layers of the adjacent second light-emitting sub-pixels are separated by the isolation structure. The first light-emitting sub-pixel is a red light-emitting sub-pixel, and the second light-emitting sub-pixel is a green light-emitting sub-pixel or a blue light-emitting sub-pixel.

2. The display module according to claim 1, characterized in that: The isolation structure is arranged around the first light-emitting sub-pixel.

3. The display module according to claim 2, characterized in that: An isolation structure is arranged at the vertex of the first light-emitting sub-pixel.

4. The display module according to any one of claims 1 to 3, characterized in that: The isolation structure includes: an isolation column or an isolation groove.

5. The display module according to any one of claims 1 to 4, characterized in that: The functional layer includes: a first functional layer and a second functional layer, the first functional layer is arranged on the pixel defining layer, and the second functional layer is arranged on the isolation structure.

6. The display module according to claim 5, characterized in that: The first functional layer and the second functional layer respectively include: a hole injection layer, a hole transport layer and a first electrode.

7. The display module according to claim 5 or 6, characterized in that: The first functional layer and the second functional layer are formed by whole-layer evaporation.

8. The display module according to any one of claims 1 to 7, characterized in that: The pixel defining layer includes a plurality of vertically and horizontally intersecting retaining walls and a plurality of openings surrounded by the vertically and horizontally intersecting retaining walls. The functional layer further includes: a third functional layer, and the third functional layer is arranged in the openings.

9. The display module according to claim 8, characterized in that: The third functional layer includes: a light-emitting layer, an electron blocking layer and a second electrode.

10. The display module according to claim 8 or 9, characterized in that: The third functional layer is formed in the opening by evaporation through a metal mask.

11. An electronic device, characterized in that: It comprises a cover plate and a display module as claimed in any one of claims 1 to 10, wherein the cover plate is arranged on the display module.

12. A method for preparing a display module, characterized in that: The method comprises: forming a pixel defining layer on a substrate; forming an isolation structure on the pixel defining layer; A plurality of light-emitting sub-pixels are formed on the pixel defining layer and the isolation structure, each light-emitting sub-pixel includes a functional layer, and the plurality of light-emitting sub-pixels include a first light-emitting sub-pixel and a second light-emitting sub-pixel, and the adjacent functional layers of the first light-emitting sub-pixel and the second light-emitting sub-pixel are separated by the isolation structure, wherein the first light-emitting sub-pixel is a red light-emitting sub-pixel, and the second light-emitting sub-pixel is a green light-emitting sub-pixel or a blue light-emitting sub-pixel.

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