Display module and electronic device

Abstract

Disclosed in embodiments of the present application are a display module and an electronic device. The display module comprises multiple pixel regions, and each pixel region comprises a red light-emitting subpixel, a green light-emitting subpixel, and a blue light-emitting subpixel; the red light-emitting subpixel, the green light-emitting subpixel, and the blue light-emitting subpixel each comprise: a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode; the light-emitting layer of the blue light-emitting subpixel has a double-layer structure; and the light-emitting layer of the red light-emitting subpixel has a single-layer structure. A first electrode, a second electrode, and a corresponding light-emitting subpixel form a corresponding microcavity structure, and blue light-emitting layers use a stack structure, so that the microcavity structure corresponding to the blue light-emitting subpixel has a longest cavity length, thereby improving the light-emitting efficiency of the blue light-emitting subpixel, prolonging the service life of the blue light-emitting subpixel, and reducing the power consumption of the display module.

Description

Display modules and electronic devices

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 31, 2023, with application number 202311136067.3 and application name “Display module and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] 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

[0003] 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.

[0004] The OLED display module includes: a driving circuit, a second electrode, a first electrode, and a plurality of light-emitting sub-pixels. The plurality of light-emitting sub-pixels are located between the second electrode and the first electrode, and the first electrode and the second electrode are electrically connected to the driving circuit.

[0005] The multiple light-emitting sub-pixels include: multiple blue light-emitting sub-pixels, multiple green light-emitting sub-pixels, and multiple red light-emitting sub-pixels. However, in OLEDs, the first electrode and the second electrode form a microcavity. Light beams reflect back and forth in the microcavity, creating a microcavity effect that enhances the intensity of certain wavelengths and weakens light at other wavelengths.

[0006] In existing OLED display modules, blue light-emitting sub-pixels, green light-emitting sub-pixels, and red light-emitting sub-pixels all adopt the first microcavity structure or the second microcavity structure, which cannot achieve optimal light-emitting efficiency.

[0007] Summary of the Invention

[0008] The embodiments of the present application provide a display module and an electronic device, in which the blue light-emitting sub-pixel adopts the second microcavity structure and the red light-emitting sub-pixel adopts the first microcavity structure, thereby improving the luminous efficiency of the display module.

[0009] To achieve the above objectives, this application adopts the following technical solutions:

[0010] In a first aspect of the present application, a display module is provided, comprising a plurality of pixel regions, each of which includes a red light-emitting sub-pixel, a green light-emitting sub-pixel, and a blue light-emitting sub-pixel; the red light-emitting sub-pixel, the green light-emitting sub-pixel, and the blue light-emitting sub-pixel each including a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode; the light-emitting layer of the blue light-emitting sub-pixel including a first blue light-emitting layer and a second blue light-emitting layer stacked; the light-emitting layer of the red light-emitting sub-pixel including a first red light-emitting layer; the light-emitting layer of the green light-emitting sub-pixel including a first green light-emitting layer; and the sum of the thickness of the first blue light-emitting layer and the thickness of the second blue light-emitting layer being greater than the thickness of the first red light-emitting layer. Thus, the first electrode, the second electrode, and the light-emitting sub-pixels form a microcavity structure, and the blue light-emitting layer of the blue light-emitting sub-pixel adopts a stacked structure, so that the cavity length of the microcavity structure of the blue light-emitting sub-pixel is the longest, thereby improving the luminous efficiency and lifespan of the blue light-emitting layer and reducing the power consumption of the display module.

[0011] In one optional implementation, the spacing between the first and second electrodes of the blue-emitting sub-pixel is greater than the spacing between the first and second electrodes of the red-emitting sub-pixel. This maximizes the length of the microcavity structure of the blue-emitting sub-pixel, improving the luminous efficiency and lifespan of the blue light-emitting layer and reducing the power consumption of the display module.

[0012] In one optional implementation, the first blue light-emitting layer comprises a stacked first hole transport layer, a first luminescent material layer, and a first electron transport layer, with the first electron transport layer positioned adjacent to the second blue light-emitting layer. The second blue light-emitting layer comprises a stacked second hole transport layer, a second luminescent material layer, and a second electron transport layer, with the second hole transport layer positioned adjacent to the first blue light-emitting layer. Thus, the hole transport layer, luminescent material layer, and electron transport layer in the blue light-emitting layer all adopt a double-layer structure, improving the lifespan and luminous efficiency of the blue light-emitting layer.

[0013] In one optional implementation, the blue light-emitting layer further includes a first electron generation layer and a first hole generation layer, the first electron generation layer and the first hole generation layer being located between the first blue light-emitting layer and the second blue light-emitting layer, wherein the first electron generation layer is disposed adjacent to the first electron transport layer, and the first hole generation layer is disposed adjacent to the second hole transport layer. Thus, by disposing the electron generation layer and the hole generation layer between the two light-emitting layers, more holes and electrons can be generated, further improving luminous efficiency.

[0014] In one optional implementation, the spacing between the first and second electrodes corresponding to the red light-emitting layer is 1 / 2 times the wavelength of red light, and the spacing between the first and second electrodes corresponding to the blue light-emitting layer is 3 / 4 times the wavelength of blue light. Thus, the blue light-emitting layer adopts the second microcavity structure, and the red light-emitting layer adopts the first microcavity structure, thereby improving the luminous efficiency of the display module.

[0015] In one optional implementation, the spacing between the first and second electrodes corresponding to the red light-emitting layer is 100-140 nm; the spacing between the first and second electrodes corresponding to the blue light-emitting layer is 180-220 nm. Thus, the spacing between the first and second electrodes corresponding to the red light-emitting layer determines the cavity length of the red light-emitting layer. A red light-emitting layer with this size forms a first microcavity structure. Similarly, a blue light-emitting layer with the aforementioned size forms a second microcavity structure, thereby improving the luminous efficiency of the display module.

[0016] In an optional implementation, the distance between the first electrode and the second electrode corresponding to the green light-emitting layer is 1 / 2 times the wavelength of green light. Thus, the green light-emitting layer adopts the first microcavity structure, which improves the luminous efficiency of the green light-emitting layer.

[0017] In an optional implementation, the distance between the first electrode and the second electrode corresponding to the green light-emitting layer is 70-110 nm. Therefore, the green light-emitting layer meeting this size is a first microcavity structure.

[0018] In one optional implementation, the spacing between the first electrode and the second electrode of the green light-emitting sub-pixel is greater than the spacing between the first electrode and the second electrode of the red light-emitting sub-pixel. This increases the cavity length of the microcavity structure corresponding to the green light-emitting layer, improves the lifespan of the green light-emitting layer, and reduces power consumption of the display module.

[0019] In an optional implementation, the first red light-emitting layer includes a third hole transport layer, and the first green light-emitting layer includes a fourth hole transport layer, wherein the thickness of the fourth hole transport layer is greater than the thickness of the third hole transport layer. Thus, by using the hole transport layer as an adjustment layer, the cavity length of the green light-emitting layer can be changed by adjusting the thickness of the adjustment layer, so that the spacing between the first electrode and the second electrode of the green light-emitting sub-pixel (i.e., the cavity length of the green light-emitting sub-pixel) is greater than the spacing between the first electrode and the second electrode of the red light-emitting sub-pixel (i.e., the cavity length of the red light-emitting sub-pixel), without the need for setting other stacked layers, the process is simpler, and production is easier.

[0020] In one optional implementation, the green light-emitting layer includes: a first green light-emitting layer and a second green light-emitting layer stacked together, wherein the spacing between the first electrode and the second electrode of the green light-emitting sub-pixel is greater than the spacing between the first electrode and the second electrode of the red light-emitting sub-pixel. Thus, the green light-emitting layer adopts a stacked structure, so that the spacing between the first electrode and the second electrode of the green light-emitting sub-pixel is greater than the spacing between the first electrode and the second electrode of the red light-emitting sub-pixel.

[0021] In one optional implementation, the first green light-emitting layer includes a fifth hole transport layer, a third light-emitting material layer, and a third electron transport layer, the third electron transport layer being positioned adjacent to the second green light-emitting layer. The second green light-emitting layer includes a sixth hole transport layer, a fourth light-emitting material layer, and a fourth electron transport layer, the sixth hole transport layer being positioned adjacent to the first green light-emitting layer. Thus, the green light-emitting layer adopts a double-layer structure, which improves the lifespan and luminous efficiency of the green light-emitting layer.

[0022] In one optional implementation, the green light-emitting layer further includes a second electron generation layer and a second hole generation layer, the second electron generation layer and the second hole generation layer being located between the first green light-emitting layer and the second green light-emitting layer, wherein the second electron generation layer is disposed adjacent to the first electron transport layer, and the second hole generation layer is disposed adjacent to the second hole transport layer. Thus, by disposing the electron generation layer and the hole generation layer between the two light-emitting layers, more holes and electrons can be generated, further improving luminous efficiency.

[0023] In an optional implementation, the distance between the first electrode and the second electrode corresponding to the green light-emitting layer is 3 / 4 times the wavelength of green light. Thus, the green light-emitting layer adopts the second microcavity structure, which increases the life of the green light-emitting layer.

[0024] In an optional implementation, the distance between the first electrode and the second electrode corresponding to the green light-emitting layer is 180-220 nm. Thus, the green light-emitting layer meeting this size is a second microcavity structure.

[0025] In an optional implementation, the plurality of light-emitting sub-pixels are independently formed by a photolithography process, thereby independently designing the microcavity structures of light-emitting layers of different colors.

[0026] In a second aspect of the present application, a display module is provided, comprising a plurality of pixel regions, each of which includes a red light-emitting sub-pixel, a green light-emitting sub-pixel, and a blue light-emitting sub-pixel; the red light-emitting sub-pixel, the green light-emitting sub-pixel, and the blue light-emitting sub-pixel each including a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode; the light-emitting layer of the red light-emitting sub-pixel includes a first hole transport layer, the light-emitting layer of the green light-emitting sub-pixel includes a second hole transport layer, and the light-emitting layer of the blue light-emitting sub-pixel includes a third hole transport layer, the thickness of the third hole transport layer being greater than the thickness of the first hole transport layer. Thus, by adjusting the thickness of the hole transport layer of the blue light-emitting sub-pixel, the cavity length of the microcavity structure of the blue light-emitting sub-pixel is maximized, thereby improving the luminous efficiency and lifespan of the blue light-emitting layer and reducing the power consumption of the display module.

[0027] In an optional implementation, the spacing between the first electrode and the second electrode of the green light-emitting sub-pixel is smaller than the spacing between the first electrode and the second electrode of the blue light-emitting sub-pixel. As a result, the green light-emitting layer can adopt the first microcavity structure, thereby improving the luminous efficiency of the green light-emitting layer.

[0028] In an optional implementation, the thickness of the second hole transport layer is greater than the thickness of the first hole transport layer. Thus, by using the hole transport layer as an adjustment layer, the cavity length of the green light-emitting layer can be changed by adjusting the thickness of the adjustment layer, so that the spacing between the first electrode and the second electrode of the green light-emitting sub-pixel (i.e., the cavity length of the green light-emitting sub-pixel) is greater than the spacing between the first electrode and the second electrode of the red light-emitting sub-pixel (i.e., the cavity length of the red light-emitting sub-pixel), without the need for additional stacking layers, the process is simpler, and production is easier.

[0029] In one optional implementation, the light-emitting layer of the green light-emitting sub-pixel includes: a first green light-emitting layer and a second green light-emitting layer stacked together, wherein the sum of the thicknesses of the first and second green light-emitting layers is greater than the thickness of the light-emitting layer of the red light-emitting sub-pixel. Thus, the green light-emitting layer adopts a stacked structure, so that the distance between the first electrode and the second electrode of the green light-emitting sub-pixel can be greater than the distance between the first electrode and the second electrode of the red light-emitting sub-pixel.

[0030] In a third aspect of the present application, an electronic device is provided, comprising a middle frame, a battery cover, and the display module described above, wherein the middle frame is positioned between the display module and the battery cover. Thus, the electronic device employs the display module described above, thereby improving the luminous efficiency and lifespan of the display module and reducing its power consumption.

[0031] The present application provides a display module and electronic device, the display module including multiple pixel regions, each of which includes a red light-emitting sub-pixel, a green light-emitting sub-pixel, and a blue light-emitting sub-pixel; the red light-emitting sub-pixel, the green light-emitting sub-pixel, and the blue light-emitting sub-pixel each including: a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode; in some embodiments, the light-emitting layer of the blue light-emitting sub-pixel includes: a first blue light-emitting layer and a second blue light-emitting layer arranged in a stacked manner; the light-emitting layer of the red light-emitting sub-pixel includes: a first red light-emitting layer; the light-emitting layer of the green light-emitting sub-pixel includes: a first green light-emitting layer; the sum of the thickness of the first blue light-emitting layer and the thickness of the second blue light-emitting layer is greater than the thickness of the first red light-emitting layer. In this embodiment, the blue light-emitting sub-pixel adopts a stacked structure to realize a second microcavity structure, and the red light-emitting sub-pixel adopts an independent first microcavity structure. In other embodiments, the hole transport layer of the blue light-emitting sub-pixel is thicker than the hole transport layer of the red light-emitting sub-pixel, and the thickness of the third hole transport layer is thicker than the thickness of the first hole transport layer. By adjusting the thickness of the hole transport layer of the blue sub-pixel, the cavity length of the microcavity structure of the blue sub-pixel is maximized, thereby realizing a second microcavity structure. In some embodiments, the green sub-pixel adopts an independent first microcavity structure; in other embodiments, the green sub-pixel adopts a stacked structure to realize the second microcavity structure; in other embodiments, the green sub-pixel realizes the second microcavity structure by changing the thickness of the hole transport layer. Thus, the blue sub-pixel adopts the second microcavity structure, the red sub-pixel adopts the first microcavity structure, and the green sub-pixel adopts either the first microcavity structure or the second microcavity structure, thereby improving the luminous efficiency of the blue and red sub-pixels and increasing the lifespan of the blue sub-pixels. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of the disassembled structure of an electronic device provided in an embodiment of the present application;

[0033] FIG2 is a schematic diagram of an arrangement of light-emitting sub-pixels provided in an embodiment of the present application;

[0034] FIG3 is a schematic diagram of a stacked structure of a display module;

[0035] FIG4 is a schematic diagram of an optical path of wide-angle interferometry provided in an embodiment of the present application;

[0036] FIG5 is a schematic diagram of an optical path of a multi-beam interference method provided in an embodiment of the present application;

[0037] FIG6 is a schematic diagram of a curve showing a change in luminous efficiency versus cavity length of a light-emitting sub-pixel according to an embodiment of the present application;

[0038] FIG7 is a schematic diagram of a stacked structure of a light-emitting device using a second microcavity structure provided in an embodiment of the present application;

[0039] FIG8 is a schematic diagram of a stacked structure of another light-emitting device using a second microcavity structure provided in an embodiment of the present application;

[0040] FIG9 is a schematic structural diagram of a first display module provided in an embodiment of the present application;

[0041] FIG10 is a schematic structural diagram of a second display module provided in an embodiment of the present application;

[0042] FIG11 is a schematic structural diagram of a third display module provided in an embodiment of the present application;

[0043] FIG12 is a schematic structural diagram of a fourth display module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 sake of convenience of explanation, the following embodiments are all exemplified by taking the electronic device as a mobile phone.

[0048] As shown in FIG1 , 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 .

[0049] The display module 10 is used to display images.

[0050] 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.

[0051] The display module 10 can be electrically connected to a PCB disposed on the middle frame 11 by passing a flexible printed circuit (FPC) through the middle frame 11 as shown in FIG1 . This allows the PCB to transmit display data to the display module 10 to control the display module 10 to display images.

[0052] 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.

[0053] 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.

[0054] In some embodiments of the present application, as shown in FIG2 , the display module 10 may include a substrate 101 , which is divided into a plurality of pixel regions P.

[0055] To enable the display module 10 to achieve color display, in some embodiments of the present application, as shown in FIG2 , each luminescent pixel region p includes at least three luminescent sub-pixels 1030 for displaying three primary colors, respectively. 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.

[0056] In some embodiments, the arrangement of the R, G, and B primary color light-emitting sub-pixels 1030 can be determined based on display quality, 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.

[0057] Taking the sub-pixel arrangement shown in Figure 2 as an example, the emitting sub-pixels arranged in a row along the horizontal direction x are referred to as emitting sub-pixels in the same row. The emitting sub-pixels arranged in a row along the vertical direction y are referred to as emitting sub-pixels in the same column. As shown in Figure 2, the emitting sub-pixels in the same column are used to emit light of the same color. For example, all the emitting sub-pixels in the same column are red emitting sub-pixels R. Each emitting sub-pixel in the same row emits light of a different color than the adjacent emitting sub-pixels. For example, the red emitting sub-pixels R, the green emitting sub-pixels G, and the blue emitting sub-pixels B are arranged alternately along the x-direction.

[0058] For ease of explanation, the present application describes the plurality of light-emitting sub-pixels 1030 as arranged in a matrix as shown in Figure 2. The shapes and arrangements of the light-emitting sub-pixels 1030 illustrated in the present application are for illustration only and are not intended to be limiting.

[0059] In some embodiments, as shown in FIG3 , the display module 10 includes a substrate 101 , a driving circuit 102 disposed on the substrate 101 , and an OLED (light-emitting device) 103 electrically connected to the driving circuit 102 . The driving circuit 102 is used to control the light-emitting device 103 for display.

[0060] 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 102 serves as a TFT backplane.

[0061] 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.

[0062] For example, in a possible embodiment, the driving circuit 102 includes a capacitor, a plurality of switching transistors, and a driving circuit.

[0063] In another possible embodiment, the driving circuit 102 includes a capacitor, a switching transistor, and a driving transistor.

[0064] In other embodiments, the driving circuit 102 may also have other structures. The driving circuit 102 in the embodiment of the present application is only an illustration.

[0065] The following describes the stacking arrangement of the driving circuit 102 and the light-emitting device 103 in the display module 10 with reference to FIG3 . As shown in FIG3 , the light-emitting device 103 is disposed on a side of the driving circuit 102 away from the substrate 101. The light-emitting device 103 includes at least an organic light-emitting layer (EML) 1031, a first electrode 1032, and a second electrode 1033. The first electrode 1032 is disposed near the driving circuit 102, and the light-emitting material layer 1031 is located between the first electrode 1032 and the second electrode 1033.

[0066] 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).

[0067] 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.

[0068] In some embodiments, after the driving circuit 102 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 device 103 emits light, and the display module 10 having multiple light-emitting devices 103 displays images.

[0069] 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.

[0070] The second electrode 1033 can be laid flat on the plurality of light-emitting sub-pixels 1030 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.

[0071] In some embodiments, the light emitting device 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 .

[0072] 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 injection layer 1034 is disposed on the surface of the first electrode 1032 away from the substrate 101.

[0073] 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 .

[0074] 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.

[0075] The electron transport layer 1038 is made of a material having high electron mobility, high thermal stability, and good hole and exciton blocking capabilities.

[0076] 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.

[0077] 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.

[0078] In some embodiments, in order to improve the efficiency of injecting electrons and holes into the light-emitting material layer, the light-emitting device 103 may further include an electron injection layer (EIL) 1039 arranged between the second electrode 1033 and the electron transport layer 1038, and a hole injection layer (HIL) 1034 arranged between the hole transport layer 1035 and the first electrode 210.

[0079] In some embodiments, the electron blocking layer 1036 and the luminescent material layer 1031 are deposited using a high-precision metal mask (FMM) for RGB patterning, thereby achieving full color. Other layers are deposited using a common metal mask (CMM mask) for evaporation and serve as common layers.

[0080] In some embodiments, the light-emitting device 103 further includes a coupling layer (CPL) 104 and a thin film encapsulation (TFE) layer 105. The coupling layer 104 is located on a surface of the second electrode 1033 away from the substrate 101, and the thin film encapsulation layer 105 is located on a surface of the coupling layer 104 away from the second electrode 1033.

[0081] The coupling layer 104 can be used to converge light and improve the forward light extraction efficiency.

[0082] The thin film encapsulation layer 105 can be used to encapsulate the display module to prevent external water and oxygen from entering the light-emitting device 103. The thin film encapsulation layer 105 includes, for example, a first inorganic layer, a second inorganic layer, and an organic layer located between the first and second inorganic layers.

[0083] In some embodiments, the light-emitting sub-pixels 1030 all adopt the first microcavity structure, or the light-emitting sub-pixels 1030 all adopt the second microcavity structure.

[0084] Among them, the microcavity structure has two types of interference: wide-angle interference as shown in Figure 4 and multi-beam interference as shown in Figure 5. In the wide-angle interference shown in Figure 4, the light emitted by the luminescent material layer 1031 is divided into beam a and beam b. Beam a reaches the second electrode 1033, and beam b is totally reflected by the first electrode 1032 and then reaches the surface of the second electrode 1033, forming interference with the previously emitted beam a.

[0085] As shown in the multi-beam interference in Figure 5, the light emitted by the luminescent material layer 1031 is divided into light beam a and light beam c after reaching the second electrode 1033. Light beam a is emitted, and light beam c is reflected to the first electrode 1032. The light passing through the first electrode 1032 is totally reflected and then reaches the surface of the second electrode 1033, forming interference with the emitted light beam a.

[0086] Taking the multi-beam interference shown in FIG5 as an example, the optical path difference L between beam a and beam c satisfies the following formula:

[0087] Where m is a positive integer, m = 1, 2, 3, ..., λ / 2 is the optical path difference caused by the reflection phase difference, n i is the refractive index of the i-th functional layer, d i is the thickness of the i-th functional layer.

[0088] is the optical length of the light-emitting sub-pixel, satisfy:

[0089] In some implementations, when i=1, n i is the refractive index of the first electrode 1032, d i is the thickness of the first electrode 1032, when i=k, n k is the refractive index of the stack below the second electrode 1033, d k is the thickness of the stack below the second electrode 1033.

[0090] In some embodiments, the refractive index of each stacked layer of the light-emitting sub-pixel is approximately equal, for example, n, then the cavity length of the light-emitting sub-pixel is satisfy:

[0091] In some embodiments, the first electrode 1032 includes a reflective layer, which is disposed on a surface of the first electrode 1032 close to the substrate. The cavity length of the light-emitting sub-pixel is the distance between the reflective layer and a surface of the second electrode 1033 close to the substrate.

[0092] In this way, when the cavity length of the light-emitting sub-pixel changes, the distance between the first electrode 1032 and the second electrode 1033 of the light-emitting sub-pixel changes accordingly.

[0093] In some embodiments, the optical path difference is equal to the emission wavelength λ, that is, when m=1, the structure of the light-emitting sub-pixel 1030 is a first microcavity structure, and the distance between the first electrode 1032 and the second electrode 1033 of the light-emitting sub-pixel is approximately

[0094] In other embodiments, when the optical path difference is equal to 2*light emission wavelength λ, that is, when m=2, the structure of the light-emitting sub-pixel 1030 is a second microcavity structure, and the distance between the first electrode 1032 and the second electrode 1033 of the light-emitting sub-pixel is approximately

[0095] Figure 6 is a schematic diagram of the curve of luminous efficiency varying with the cavity length of the light-emitting sub-pixel. As shown in Figure 6, for the blue light-emitting sub-pixel B for emitting blue light, the blue light current efficiency is highest when the second microcavity structure is adopted. For the green light-emitting sub-pixel G for emitting green light, the green light current efficiency is highest when the first microcavity structure is adopted. For the red light-emitting sub-pixel R for emitting red light, the red light current efficiency is highest when the first microcavity structure is adopted.

[0096] However, current OLED display modules use high-precision metal masks for RGB patterning and vapor deposition to achieve full color. To reduce costs, as shown in Figure 3, only the light-emitting layer and electron-blocking layer in the display module are patterned, while the other layers are still deposited using a common metal mask. As a result, the blue, green, and red sub-pixels all use the second microcavity structure, or all use the first microcavity structure, which cannot achieve optimal luminous efficiency.

[0097] To this end, an embodiment of the present application provides an improved display module, in which the blue light-emitting sub-pixels, the green light-emitting sub-pixels, and the red light-emitting sub-pixels may adopt different microcavity structures to improve the luminous efficiency of the display module.

[0098] The embodiments of the present application do not limit the preparation process of the display module. In some embodiments, photolithography OLED technology can be used so that OLEDs of different colors can be independently evaporated to achieve independent design of the microcavity structure of different color light-emitting sub-pixels.

[0099] In some embodiments, the blue light-emitting sub-pixel adopts the second microcavity structure, and the green light-emitting sub-pixel and the red light-emitting sub-pixel both adopt the first microcavity structure.

[0100] In other embodiments, the blue light-emitting sub-pixels and the green light-emitting sub-pixels both adopt the second microcavity structure, and the red light-emitting sub-pixels both adopt the first microcavity structure.

[0101] In other embodiments, the blue light-emitting sub-pixel and the red light-emitting sub-pixel both adopt the second microcavity structure, and the green light-emitting sub-pixel adopts the first microcavity structure.

[0102] Thus, in the display module provided by the embodiment of the present application, the red light-emitting sub-pixel adopts the first microcavity structure to improve efficiency and reduce power consumption, while the blue device adopts the second microcavity structure to extend the life of the blue light-emitting sub-pixel and the chromaticity life of the white light.

[0103] The light-emitting sub-pixel using the second microcavity structure satisfies the following conditions: the spacing between the first electrode 1032 and the second electrode 1033 is 3 / 4λ, where λ is the wavelength of light in the light-emitting sub-pixel.

[0104] To achieve the second microcavity structure, in some embodiments of the present application, the light-emitting device 103 may employ a tandem structure, comprising two light-emitting layers, each of which comprises a hole transport layer, a light-emitting material layer, and an electron transport layer. For example, as shown in FIG7 , the light-emitting layer comprises a first light-emitting layer 1030 a and a second light-emitting layer 1030 b stacked along the z-direction.

[0105] Therefore, the light-emitting layer stacked structure can be used to realize the second microcavity structure, thereby increasing the lifespan of the light-emitting sub-pixel, realizing a large design of the light-emitting layer of the light-emitting sub-pixel, and improving the chromaticity lifespan.

[0106] For example, as shown in FIG7 , the first light-emitting layer 1030 a includes: a first hole transport layer 1035 a , a first light-emitting material layer 1031 a , and a first electron transport layer 1038 a .

[0107] In some embodiments, the first light emitting layer 1030a further includes a first electron blocking layer 1036a and a first hole blocking layer 1037a.

[0108] 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.

[0109] In some other embodiments, the second light-emitting layer further includes: a second electron blocking layer 1036b and a second hole blocking layer 1037b.

[0110] 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.

[0111] 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.

[0112] In some embodiments, the light-emitting sub-pixel 1030 adopting a stacked structure also includes: an electron generation layer (N-CGL) 106 and a hole generation layer (P-CGL) 107, and the electron generation layer 106 and the hole generation layer 107 are located between the first electron transport layer 1038a and the second hole transport layer 1035b.

[0113] The electron generation layer 106 is used to generate charges, and the hole generation layer 107 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.

[0114] In other embodiments of the present application, the hole transport layer 1035 can serve as an adjustment layer, and the thickness of the hole transport layer 1035 can be adjusted so that the distance between the first electrode 1032 and the second electrode 1033 of the light-emitting sub-pixel reaches 3 / 4λ.

[0115] For example, in some embodiments, as shown in Figure 8, the cavity length of the optical microcavity corresponding to the light-emitting sub-pixel 1030 can be controlled by regulating the thickness of the hole transport layer 1035, that is, the distance between the first electrode 1032 and the second electrode 1033 corresponding to the light-emitting sub-pixel 1030 can be controlled.

[0116] Therefore, the second microcavity structure can be realized by adjusting the thickness of the hole transport layer 1035 without providing other stacked layers, thereby reducing the difficulty of the process.

[0117] The display module of the embodiment of the present application is described below with reference to FIG9 to FIG12 .

[0118] In some embodiments, as shown in FIG9 , a display module 10 includes a substrate 101, a driving circuit 102 disposed on the substrate 101, and a red light-emitting device 103R, a green light-emitting device 103G, and a blue light-emitting device 103B electrically connected to the driving circuit 102. The driving circuit 102 is configured to control the red light-emitting device 103R, the green light-emitting device 103G, and the blue light-emitting device 103B to emit light.

[0119] The red light emitting device 103R and the green light emitting device 103G adopt a first microcavity independent (Single) structure design, and the blue light emitting device 103B adopts a second microcavity independent design as shown in FIG. 8 .

[0120] As shown in FIG9 , the red light-emitting device 103R includes: a first electrode 1032R, a first hole injection layer 1034R, a first hole transport layer 1035R, a first electron blocking layer 1036R, a first light-emitting material layer 1031R, a first hole blocking layer 1037R, a first electron transport layer 1038R, a first electron injection layer 1039R, and a second electrode 1033R, stacked along the z-direction. The first electrode 1032R is disposed on a surface of the driving circuit 102 that is away from the substrate 101.

[0121] In some embodiments, the red light emitting device 103R further includes a first coupling layer 104R and a first thin film encapsulation layer 105R, which can protect the red light emitting device 103R.

[0122] The green light-emitting device 103G includes: a third electrode 1032G, a second hole injection layer 1034G, a second hole transport layer 1035G, a second electron blocking layer 1036G, a second light-emitting material layer 1031G, a second hole blocking layer 1037G, a second electron transport layer 1038G, a second electron injection layer 1039G, and a fourth electrode 1033G, which are stacked along the z-direction. The third electrode 1032G is disposed on a surface of the driving circuit 102 that is away from the substrate 101.

[0123] The blue light-emitting device 103B includes: a fifth electrode 1032B, a third hole injection layer 1034B, a third hole transport layer 1035B, a third electron blocking layer 1036B, a third light-emitting material layer 1031B, a third hole blocking layer 1037B, a third electron transport layer 1038B, a third electron injection layer 1039B, and a sixth electrode 1033B, stacked along the z-direction. The fifth electrode 1032B is disposed on a surface of the driver circuit 102 that is away from the substrate 101.

[0124] In this embodiment, the spacing between the first electrode 1032R and the second electrode 1033R of the red light-emitting device 103R is ½ the wavelength of red light, and the spacing between the third electrode 1032G and the fourth electrode 1033G of the green light-emitting device 103G is ½ the wavelength of green light. The blue light-emitting device 103B differs from the red and green light-emitting devices 103R and 103G in that its hole transport layer 1035B serves as an adjustment layer. The thickness of this third hole transport layer 1035B can be adjusted to ensure that the spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light-emitting device 103B is ¾ the wavelength of blue light.

[0125] In some embodiments, the spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light-emitting device 103B is 180-220 nm, the spacing between the first electrode 1032R and the second electrode 1033R of the red light-emitting device 103R is 100-140 nm, and the spacing between the third electrode 1032G and the fourth electrode 1033G of the green light-emitting device 103G is 70-110 nm.

[0126] In some embodiments, the display module shown in FIG9 and the display module shown in FIG3 are respectively used in a 6-inch mobile phone with a brightness of 500 nits. The power consumption of the display module shown in FIG9 is 80.3% of the power consumption of the display module shown in FIG3. Therefore, compared with the display module shown in FIG3, the display module shown in FIG9 has increased luminous efficiency and reduced power consumption by 19.7%.

[0127] In other embodiments, as shown in FIG10 , the red light emitting device 103R and the green light emitting device 103G adopt the same first microcavity independent structure as FIG9 , and the blue light emitting device 103B adopts the second microcavity tandem structure as shown in FIG7 .

[0128] The structural description of the red light emitting device 103R and the green light emitting device 103G in Figure 10 can refer to the description of Figure 9. The blue light emitting device 103B in Figure 10 includes two light emitting layers, each of which includes a hole transport layer, a light emitting material layer and an electron transport layer.

[0129] For example, the blue light emitting device 103B includes a first blue light emitting layer and a second blue light emitting layer stacked along the z direction.

[0130] In some embodiments, the first blue light-emitting layer includes: a fourth hole transport layer 1035B1 , a fourth light-emitting material layer 1031B1 , and a fourth electron transport layer 1038B1 stacked along the z-direction.

[0131] In some embodiments, the first blue light emitting layer further includes a fourth electron blocking layer 1036B1 and a fourth hole blocking layer 1037B1.

[0132] The second blue light-emitting layer includes a fifth hole transport layer 1035B2 , a fifth light-emitting material layer 1031B2 , and a fifth electron transport layer 1038B2 stacked along the z direction.

[0133] In some embodiments, the second blue light emitting layer further includes a fifth electron blocking layer 1036B2 and a fifth hole blocking layer 1037B2.

[0134] In some embodiments, the fourth hole transport layer 1035B1 and the fourth electron blocking layer 1036B1 are sequentially stacked along the z-direction between the fifth electrode 1032B and the fourth light-emitting material layer 1031B1. The fourth hole blocking layer 1037B1, the fourth electron transport layer 1038B1, the fifth hole transport layer 1035B2, and the fifth electron blocking layer 1036B2 are sequentially stacked between the fourth light-emitting material layer 1031B1 and the fifth light-emitting material layer 1031B2. The fifth electron transport layer 1038B2 and the fifth hole blocking layer 1037B2 are located between the fifth light-emitting material layer 1031B2 and the third electron injection layer 1039B.

[0135] In some embodiments, the blue light-emitting device 103B2 with a stacked structure further includes: a first electron generation layer 106B and a first hole generation layer 107B, which are located between the fourth electron transport layer 1038B1 and the fifth hole transport layer 1035B2.

[0136] In this embodiment, the spacing between the first electrode 1032R and the second electrode 1033R of the red light-emitting device 103R is 1 / 2 of the wavelength of red light, and the spacing between the third electrode 1032G and the fourth electrode 1033G of the green light-emitting device 103G is 1 / 2 of the wavelength of green light. The blue light-emitting device 103B differs from the red and green light-emitting devices 103R and 103G in that it employs a two-layer organic light-emitting layer structure, resulting in a spacing between the fifth and sixth electrodes 1032B and 1033B of the blue light-emitting device 103B that is 3 / 4 of the wavelength of blue light.

[0137] In some embodiments, the spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light-emitting device 103B is 180-220 nm, the spacing between the first electrode 1032R and the second electrode 1033R of the red light-emitting device 103R is 100-140 nm, and the spacing between the third electrode 1032G and the fourth electrode 1033G of the green light-emitting device 103G is 70-110 nm.

[0138] In some embodiments, the display module shown in FIG10 and the display module shown in FIG3 are respectively used in a 6-inch mobile phone with a brightness of 500 nits. The power consumption of the display module shown in FIG10 is 66.4% of the power consumption of the display module shown in FIG3. Therefore, compared with the display module shown in FIG3, the display module shown in FIG10 has increased luminous efficiency and reduced power consumption by 33.6%.

[0139] In the display module of this embodiment, the red light-emitting device 103R and the green light-emitting device 103G adopt the first microcavity independent structure design, which increases the luminous efficiency. The blue light-emitting device 103B adopts the second microcavity stacked structure to improve the luminous efficiency and life of the blue light-emitting device 103B. The cross-sections of the red light-emitting sub-pixel R, the green light-emitting sub-pixel G, and the blue light-emitting sub-pixel B are designed with the same size, which increases the chromaticity life by 300%, and also improves the chromaticity life of the white light.

[0140] In other embodiments, as shown in FIG11 , the red light-emitting device 103R adopts the same first microcavity independent structure as the red light-emitting device 103R in FIG9 and FIG10 , the green light-emitting device 103G adopts the second microcavity independent design as shown in FIG8 , and the blue light-emitting device 103B adopts the same second microcavity stacked structure as the blue light-emitting device 103B in FIG10 .

[0141] The specific structures of the red light-emitting device 103R and the blue light-emitting device 103B can be referred to the above embodiments and will not be described again here.

[0142] In this embodiment, the green light-emitting device 103G includes: a third electrode 1032G, a second hole injection layer 1034G, a sixth hole transport layer 1035G1, a second electron blocking layer 1036G, a second light-emitting material layer 1031G, a second hole blocking layer 1037G, a second electron transport layer 1038G, a second electron injection layer 1039G, and a fourth electrode 1033G, stacked along the z-direction. The third electrode 1032G is disposed on a surface of the driving circuit 102 that is away from the substrate 101.

[0143] In this embodiment, the spacing between the first electrode 1032R and the second electrode 1033R of the red light-emitting device 103R is 1 / 2 the wavelength of red light. The green light-emitting device 103G in Figure 11 differs from the green light-emitting device 103G in Figures 9 and 10 in that its sixth hole transport layer 1035G1 serves as an adjustment layer, allowing the thickness of this sixth hole transport layer 1035G1 to be adjusted so that the spacing between the third electrode 1032G and the fourth electrode 1033G of the green light-emitting device 103G is 3 / 4 times the wavelength of green light. The blue light-emitting device 103B employs a two-layer organic light-emitting layer structure, resulting in a spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light-emitting device 10 ...

[0144] In some embodiments of this example, the distance between the fifth electrode 1032B and the sixth electrode 1033B of the blue light-emitting device 103B is 180-220 nm. The distance between the first electrode 1032R and the second electrode 1033R of the red light-emitting device 103R is 100-140 nm, and the distance between the third electrode 1032G and the fourth electrode 1033G of the green light-emitting device 103G is 180-220 nm.

[0145] In some embodiments, the display module shown in FIG11 and the display module shown in FIG3 are respectively used in a 6-inch mobile phone with a brightness of 500 nits. The power consumption of the display module shown in FIG11 is 79% of the power consumption of the display module shown in FIG3. Therefore, compared with the display module shown in FIG3, the display module shown in FIG11 has increased luminous efficiency and reduced power consumption by 21%.

[0146] In the display module of this embodiment, the red light-emitting device 103R adopts a first microcavity independent structure design, which increases the luminous efficiency, and the green light-emitting device 103G adopts a second microcavity independent design, and the blue light-emitting device 103B adopts a second microcavity stacked structure, which improves the luminous efficiency and life of the blue light-emitting device 103B, so that the cross-sections of the red light-emitting sub-pixel R, the green light-emitting sub-pixel G and the blue light-emitting sub-pixel B can be designed with the same size, and the chromaticity lifetime is increased by 300%, while the chromaticity lifetime of the white light is also improved.

[0147] In other embodiments, as shown in FIG12 , the red light-emitting device 103R adopts a first microcavity independent structure design, and the blue light-emitting device 103B and the green light-emitting device 103G adopt a second microcavity stacked structure design.

[0148] The specific structures of the red light-emitting device 103R and the blue light-emitting device 103B can be referred to the above embodiments and will not be described again here.

[0149] The green light-emitting device 103G in FIG12 includes two light-emitting layers, each of which includes a hole transport layer, a light-emitting material layer, and an electron transport layer.

[0150] For example, the green light emitting device 103G includes a first blue light emitting layer and a second blue light emitting layer stacked along the z direction.

[0151] In some embodiments, the first green light emitting layer includes a seventh hole transport layer 1035G1 , a fifth light emitting material layer 1031G1 , and a fifth electron transport layer 1038G1 .

[0152] In some embodiments, the first green light emitting layer further includes a sixth electron blocking layer 1036G1 and a sixth hole blocking layer 1037G1.

[0153] The second green light-emitting layer includes an eighth hole transport layer 1035G2 , a seventh light-emitting material layer 1031G2 and a seventh electron transport layer 1038G2 .

[0154] In some embodiments, the second green light emitting layer further includes a seventh electron blocking layer 1036G2 and a seventh hole blocking layer 1037G2.

[0155] In some embodiments, the seventh hole transport layer 1035G1 and the sixth electron blocking layer 1036G1 are sequentially stacked along the z-direction between the third electrode 1032G and the sixth light-emitting material layer 1031G1. The sixth hole blocking layer 1037G1, the sixth electron transport layer 1038G1, the seventh hole transport layer 1035G2, and the seventh electron blocking layer 1036G2 are sequentially stacked between the sixth light-emitting material layer 1031G1 and the seventh light-emitting material layer 1031G2. The seventh hole blocking layer 1037G2 and the seventh electron transport layer 1038G2 are located between the seventh light-emitting material layer 1031G2 and the electron injection layer 1039.

[0156] In some embodiments, the green light-emitting device 103G with a stacked structure further includes: a second electron generation layer 106G and a second hole generation layer 107G, which are located between the sixth electron transport layer 1038G1 and the seventh hole transport layer 1035G2.

[0157] In this embodiment, the spacing between the first electrode 1032R and the second electrode 1033R of the red light-emitting device 103R is ½ the wavelength of red light. The green light-emitting device 103G in Figure 12 differs from the green light-emitting device 103G in Figures 9 and 10 in that it employs a two-layer organic light-emitting layer structure, resulting in a spacing between the third electrode 1032G and the fourth electrode 1033G of the green light-emitting device 103G being ¾ the wavelength of green light. The blue light-emitting device 103B employs a two-layer organic light-emitting layer structure, resulting in a spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light-emitting device 103B being ¾ the wavelength of blue light.

[0158] In some embodiments of this example, the distance between the fifth electrode 1032B and the sixth electrode 1033B of the blue light-emitting device 103B is 180-220 nm. The distance between the first electrode 1032R and the second electrode 1033R of the red light-emitting device 103R is 100-140 nm, and the distance between the third electrode 1032G and the fourth electrode 1033G of the green light-emitting device 103G is 180-220 nm.

[0159] In some embodiments, the display module shown in FIG12 and the display module shown in FIG3 are respectively used in a 6-inch mobile phone with a brightness of 500 nits. The power consumption of the display module shown in FIG12 is 66% of the power consumption of the display module shown in FIG3. Therefore, compared with the display module shown in FIG3, the display module shown in FIG12 has increased luminous efficiency and reduced power consumption by 34%.

[0160] In the display module of this embodiment, the red light-emitting device 103R adopts a first microcavity independent structure design, which increases the luminous efficiency, and the green light-emitting device 103G adopts a second microcavity independent design, and the blue light-emitting device 103B adopts a second microcavity stacked structure, which improves the luminous efficiency and life of the blue light-emitting device 103B, so that the cross-sections of the red light-emitting sub-pixel R, the green light-emitting sub-pixel G and the blue light-emitting sub-pixel B can be designed with the same size, and the chromaticity lifetime is increased by 250%, while the chromaticity lifetime of the white light is also improved.

[0161] In other embodiments of the present application, the light-emitting device of the stacked structure shown in Figure 7 includes: a first hole blocking layer 1037a and a second hole blocking layer 1037b. The first hole blocking layer 1037a and the second hole blocking layer 1037b can also be used as adjustment layers. By adjusting the thickness of the first hole blocking layer 1037a and the second hole blocking layer 1037b, the total thickness of the first hole blocking layer 1037a and the second hole blocking layer 1037b meets the preset value, thereby realizing the second microcavity structure of the light-emitting device.

[0162] In some embodiments, the thicknesses of the first hole blocking layer 1037a and the second hole blocking layer 1037b can be adjusted so that the thicknesses of the first hole blocking layer 1037a and the second hole blocking layer 1037b are the same, thereby realizing the second microcavity structure of the light-emitting device.

[0163] In some embodiments, the thicknesses of the first hole blocking layer 1037a and the second hole blocking layer 1037b can be adjusted so that the thicknesses of the first hole blocking layer 1037a and the second hole blocking layer 1037b are different, thereby realizing a second microcavity structure of the light-emitting device.

[0164] The present application provides a display module and electronic device, the display module comprising: a substrate, a driving circuit, a first electrode, a plurality of light-emitting sub-pixels, and a second electrode; the driving circuit is disposed on the substrate, the first electrode, the plurality of light-emitting sub-pixels, and the second electrode being sequentially stacked on a side of the driving circuit away from the substrate, the plurality of light-emitting sub-pixels being arranged in an array, the second electrode and the first electrode corresponding to the plurality of light-emitting sub-pixels; the plurality of light-emitting sub-pixels comprising: a plurality of red light-emitting sub-pixels, a plurality of green light-emitting sub-pixels, and a plurality of blue light-emitting sub-pixels. In some embodiments, the blue light-emitting sub-pixels employ a stacked structure to implement a second microcavity structure, the red light-emitting sub-pixels employ an independent first microcavity structure, and the green light-emitting sub-pixels employ an independent first microcavity structure; in other embodiments, the hole transport layer thickness of the blue light-emitting sub-pixel is greater than the hole transport layer thickness of the red light-emitting sub-pixel, and the thickness of the third hole transport layer is greater than the thickness of the first hole transport layer. By adjusting the hole transport layer thickness of the blue light-emitting sub-pixel, the cavity length of the microcavity structure of the blue light-emitting sub-pixel is maximized, thereby implementing the second microcavity structure. In other embodiments, the blue sub-pixel uses a stacked structure to implement the second microcavity structure, the red sub-pixel uses an independent first microcavity structure, and the green sub-pixel uses a stacked structure to implement the second microcavity structure. In other embodiments, the blue sub-pixel uses a stacked structure to implement the second microcavity structure, the red sub-pixel uses an independent first microcavity structure, and the green sub-pixel uses an independent structure, and the second microcavity structure is achieved by changing the thickness of the adjustment layer. Thus, the blue sub-pixel uses the second microcavity structure, the red sub-pixel uses the first microcavity structure, and the green sub-pixel uses either the first microcavity structure or the second microcavity structure, thereby improving the luminous efficiency of the blue and red sub-pixels and increasing the lifespan of the blue sub-pixels.

[0165] 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: include: The display module includes a plurality of pixel regions, each of which includes a red light-emitting sub-pixel, a green light-emitting sub-pixel and a blue light-emitting sub-pixel; The red light-emitting sub-pixel, the green light-emitting sub-pixel and the blue light-emitting sub-pixel each include: a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode; The light-emitting layer of the blue light-emitting sub-pixel includes: a first blue light-emitting layer and a second blue light-emitting layer that are stacked; the light-emitting layer of the red light-emitting sub-pixel includes: a first red light-emitting layer; the light-emitting layer of the green light-emitting sub-pixel includes: a first green light-emitting layer; the sum of the thickness of the first blue light-emitting layer and the thickness of the second blue light-emitting layer is greater than the thickness of the first red light-emitting layer.

2. The display module according to claim 1, characterized in that: The distance between the first electrode and the second electrode of the blue light-emitting sub-pixel is greater than the distance between the first electrode and the second electrode of the red light-emitting sub-pixel.

3. The display module according to claim 1 or 2, characterized in that: The first blue light-emitting layer comprises: a first hole transport layer, a first light-emitting material layer and a first electron transport layer which are stacked, and the first electron transport layer is arranged close to the second blue light-emitting layer; The second blue light-emitting layer includes: a second hole transport layer, a second light-emitting material layer, and a second electron transport layer which are stacked, and the second hole transport layer is arranged close to the first blue light-emitting layer.

4. The display module according to claim 3, characterized in that: The light-emitting layer of the blue light-emitting sub-pixel also includes: a first electron generation layer and a first hole generation layer, wherein the first electron generation layer and the first hole generation layer are located between the first blue light-emitting layer and the second blue light-emitting layer, wherein the first electron generation layer is arranged close to the first electron transport layer, and the first hole generation layer is arranged close to the second hole transport layer.

5. The display module according to any one of claims 1 to 4, characterized in that: The distance between the first electrode and the second electrode of the red light-emitting sub-pixel is 1 / 2 times the wavelength of red light, and the distance between the first electrode and the second electrode of the blue light-emitting sub-pixel is 3 / 4 times the wavelength of blue light.

6. The display module according to any one of claims 1 to 5, characterized in that: The distance between the first electrode and the second electrode of the red light-emitting sub-pixel is 100-140nm; The distance between the first electrode and the second electrode of the blue light-emitting sub-pixel is 180-220 nm.

7. The display module according to any one of claims 1 to 6, characterized in that: A distance between the first electrode and the second electrode of the green light-emitting sub-pixel is smaller than a distance between the first electrode and the second electrode of the blue light-emitting sub-pixel.

8. The display module according to claim 7, characterized in that: The distance between the first electrode and the second electrode of the green light-emitting sub-pixel is 1 / 2 times of the wavelength of green light.

9. The display module according to claim 7 or 8, characterized in that: The distance between the first electrode and the second electrode of the green light-emitting sub-pixel is 70-110 nm.

10. The display module according to any one of claims 1 to 6, characterized in that: A distance between the first electrode and the second electrode of the green light-emitting sub-pixel is greater than a distance between the first electrode and the second electrode of the red light-emitting sub-pixel.

11. The display module according to claim 10, characterized in that: The first red light-emitting layer includes: a third hole transport layer, and the first green light-emitting layer includes: a fourth hole transport layer, and the thickness of the fourth hole transport layer is greater than the thickness of the third hole transport layer.

12. The display module according to claim 10, characterized in that: The light-emitting layer of the green light-emitting sub-pixel further includes: a second green light-emitting layer stacked with the first green light-emitting layer, and the sum of the thicknesses of the first green light-emitting layer and the second green light-emitting layer is greater than the thickness of the red light-emitting layer.

13. The display module according to claim 12, characterized in that: The first green light-emitting layer comprises: a fifth hole transport layer, a third light-emitting material layer and a third electron transport layer which are stacked, and the third electron transport layer is arranged close to the second green light-emitting layer; The second green light-emitting layer includes: a sixth hole transport layer, a fourth light-emitting material layer and a fourth electron transport layer which are stacked, and the sixth hole transport layer is arranged close to the first green light-emitting layer.

14. The display module according to claim 13, characterized in that: The light-emitting layer of the green light-emitting sub-pixel also includes: a second electron generation layer and a second hole generation layer, wherein the second electron generation layer and the second hole generation layer are located between the first green light-emitting layer and the second green light-emitting layer, wherein the second electron generation layer is arranged close to the first electron transport layer, and the second hole generation layer is arranged close to the second hole transport layer.

15. The display module according to any one of claims 10 to 14, characterized in that: The distance between the first electrode and the second electrode of the green light-emitting sub-pixel is 3 / 4 times the wavelength of green light.

16. The display module according to any one of claims 10 to 15, characterized in that: The distance between the first electrode and the second electrode of the green light-emitting sub-pixel is 180-220 nm.

17. The display module according to any one of claims 1 to 16, characterized in that: The red light-emitting sub-pixel, the green light-emitting sub-pixel and the blue light-emitting sub-pixel are all independently formed by a photolithography process.

18. A display module, characterized in that: include: The display module includes a plurality of pixel regions, each of which includes a red light-emitting sub-pixel, a green light-emitting sub-pixel and a blue light-emitting sub-pixel; The red light-emitting sub-pixel, the green light-emitting sub-pixel and the blue light-emitting sub-pixel each include: a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode; The light-emitting layer of the red light-emitting sub-pixel includes: a first hole transport layer, the light-emitting layer of the green light-emitting sub-pixel includes: a second hole transport layer, and the light-emitting layer of the blue light-emitting sub-pixel includes: a third hole transport layer, and the thickness of the third hole transport layer is greater than the thickness of the first hole transport layer.

19. The display module according to claim 18, characterized in that: A distance between the first electrode and the second electrode of the green light-emitting sub-pixel is smaller than a distance between the first electrode and the second electrode of the blue light-emitting sub-pixel.

20. The display module according to claim 18, characterized in that: The thickness of the second hole transport layer is greater than the thickness of the first hole transport layer.

21. The display module according to claim 18, characterized in that: The light-emitting layer of the green light-emitting sub-pixel includes: a first green light-emitting layer and a second green light-emitting layer which are stacked, and the sum of the thicknesses of the first green light-emitting layer and the second green light-emitting layer is greater than the thickness of the light-emitting layer of the red light-emitting sub-pixel.

22. An electronic device, characterized in that: It comprises a middle frame, a battery cover, and the display module according to any one of claims 1 to 21, wherein the middle frame is located between the display module and the battery cover.

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