Display module and electronic equipment

Abstract

The embodiment of the invention discloses a display module and electronic equipment, the display module comprises a plurality of pixel areas, and each pixel area comprises a red light-emitting sub-pixel, a green light-emitting sub-pixel and a blue light-emitting sub-pixel; each of the red light-emitting sub-pixel, the green light-emitting sub-pixel and the blue light-emitting sub-pixel comprises 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 is of a double-layer structure; the light-emitting layer of the red light-emitting sub-pixel is of a single-layer structure. The first electrode, the second electrode and the light-emitting sub-pixel form a micro-cavity structure, and the blue light-emitting layer adopts a laminated structure, so that the cavity length of the micro-cavity structure corresponding to the blue light-emitting sub-pixel is longest, the light-emitting efficiency of the blue light-emitting sub-pixel is improved, the service life of the blue light-emitting sub-pixel is prolonged, and the power consumption of the display module 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, display screens based on organic light-emitting diodes (OLED) are widely used, for example, in various electronic devices such as mobile phones, tablets, computers, televisions, watches, etc.

[0003] The OLED display module comprises: 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.

[0004] The plurality of light-emitting sub-pixels include: a plurality of blue light-emitting sub-pixels, a plurality of green light-emitting sub-pixels, and a plurality of red light-emitting sub-pixels. However, in the OLED, the first electrode and the second electrode form a microcavity, and the light beam reflects back and forth in the microcavity, forming a microcavity effect in which the intensity of light of certain fixed wavelengths is enhanced and the intensity of light of other wavelengths is weakened.

[0005] In the existing OLED display module, the blue light-emitting sub-pixel, the green light-emitting sub-pixel and the red light-emitting sub-pixel all adopt the first microcavity structure or the second microcavity structure, which cannot achieve the optimal light-emitting efficiency. Summary of the invention

[0006] The embodiments of the present application provide a display module and an electronic device, so that 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 light-emitting efficiency of the display module.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] In the first aspect of the present application, a display module is provided, which includes a plurality of pixel areas, 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 all 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 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. Thus, the first electrode, the second electrode and the light-emitting sub-pixel constitute 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, the light-emitting efficiency and life of the blue light-emitting layer are improved, and the power consumption of the display module is reduced.

[0009] In an optional implementation, 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. Thus, the cavity length of the microcavity structure of the blue light-emitting sub-pixel is the longest, the luminous efficiency and life of the blue light-emitting layer are improved, and the power consumption of the display module is reduced.

[0010] In an optional implementation, the first blue light-emitting layer includes: 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. Thus, the hole transport layer, the light-emitting material layer and the electron transport layer in the blue light-emitting layer all adopt a double-layer structure, which improves the lifespan and luminous efficiency of the blue light-emitting layer.

[0011] In an 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 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. Thus, by arranging 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.

[0012] In an optional implementation, the spacing between the first electrode and the second electrode corresponding to the red light emitting layer is 1 / 2 times the wavelength of red light, and the spacing between the first electrode and the second electrode 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.

[0013] In an optional implementation, the spacing between the first electrode and the second electrode corresponding to the red light-emitting layer is 100-140nm; the spacing between the first electrode and the second electrode corresponding to the blue light-emitting layer is 180-220nm. Thus, the spacing between the first electrode and the second electrode corresponding to the red light-emitting layer determines the cavity length of the red light-emitting layer, and the red light-emitting layer with this size is the first microcavity structure. Similarly, the blue light-emitting layer with the above size is the second microcavity structure, which improves the luminous efficiency of the display module.

[0014] 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 of 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.

[0015] 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. Thus, the green light-emitting layer meeting this size is a first microcavity structure.

[0016] In an optional implementation, the distance between the first electrode and the second electrode of the green light-emitting sub-pixel is greater than the distance between the first electrode and the second electrode of the red light-emitting sub-pixel. Thus, the cavity length of the microcavity structure corresponding to the green light-emitting layer is increased, the life of the green light-emitting layer is improved, and the power consumption of the display module is reduced.

[0017] 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, and 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 (that is, 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 (that is, the cavity length of the red light-emitting sub-pixel), and no other stacking layers are required, the process is simpler, and it is easy to produce.

[0018] In an optional implementation, the green light-emitting layer includes: a first green light-emitting layer and a second green light-emitting layer stacked, and 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 can be greater than the spacing between the first electrode and the second electrode of the red light-emitting sub-pixel.

[0019] In an 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 arranged in a stacked manner, 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 arranged in a stacked manner, and the sixth hole transport layer is arranged close to the first green light-emitting layer. Thus, the green light-emitting layer adopts a double-layer structure, which improves the life and luminous efficiency of the green light-emitting layer.

[0020] In an 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 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. Thus, by arranging 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 luminous efficiency.

[0021] 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 of 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.

[0022] 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.

[0023] 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.

[0024] In the second aspect of the present application, a display module is provided, which includes a plurality of pixel areas, 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. 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 made the longest, the luminous efficiency and life of the blue light-emitting layer are improved, and the power consumption of the display module is reduced.

[0025] 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. Thus, the green light-emitting layer can adopt the first microcavity structure, thereby improving the light-emitting efficiency of the green light-emitting layer.

[0026] 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 (that is, 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 (that is, the cavity length of the red light-emitting sub-pixel), and no other stacking layers are required, the process is simpler, and it is easy to produce.

[0027] In an 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, 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. 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.

[0028] In a third aspect of the present application, an electronic device is provided, comprising a middle frame, a battery cover, and the display module as described above, wherein the middle frame is located between the display module and the battery cover. Thus, the electronic device adopts the display module, thereby improving the luminous efficiency and life of the display module and reducing the power consumption of the display module.

[0029] The present application provides a display module and an electronic device, the display module includes a plurality of pixel areas, 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; 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 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. 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 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 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 made the longest, and the second microcavity structure is realized. In some embodiments, the green light-emitting sub-pixel adopts an independent first microcavity structure; in other embodiments, the green light-emitting sub-pixel adopts a stacked structure to realize the second microcavity structure; in other embodiments, the green light-emitting sub-pixel realizes the second microcavity structure by changing the thickness of the hole transport layer. Thus, the blue light-emitting sub-pixel adopts the second microcavity structure, the red light-emitting sub-pixel adopts the first microcavity structure, and the green light-emitting sub-pixel adopts the first microcavity structure or the second microcavity structure, which improves the luminous efficiency of the blue light-emitting sub-pixel and the red light-emitting sub-pixel, and improves the life of the blue light-emitting sub-pixel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the disassembled structure of an electronic device provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of an arrangement of light-emitting sub-pixels provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of a stacked structure of a display module;

[0033] Figure 4 A schematic diagram of a wide-angle interferometer optical path provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of a light path of multi-beam interference provided in an embodiment of the present application;

[0035] Figure 6A schematic diagram of a curve showing a change in luminous efficiency versus cavity length of a luminous sub-pixel provided in an embodiment of the present application;

[0036] Figure 7 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;

[0037] Figure 8 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;

[0038] Fig. 9 A schematic diagram of the structure of a first display module provided in an embodiment of the present application;

[0039] Fig.10 A schematic diagram of the structure of a second display module provided in an embodiment of the present application;

[0040] Fig.11 A schematic diagram of the structure of a third display module provided in an embodiment of the present application;

[0041] Fig.12 A schematic diagram of the structure of a fourth display module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0043] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "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.

[0044] In addition, in the present 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 the changes in the orientation of the components in the drawings.

[0045] The embodiment of the present application provides an electronic device. The electronic device can be a tablet computer, a mobile phone, an e-reader, a remote control, a personal computer (PC), a laptop, a personal digital assistant (PDA), a vehicle-mounted device, an Internet TV, a wearable device, a TV, and other products with a display interface, as well as smart display wearable products such as smart watches and smart bracelets. The embodiment of the present application does not impose any special restrictions on the form of the above-mentioned electronic devices. For the convenience of explanation, the following embodiments are all exemplified by taking the electronic device as a mobile phone as an example.

[0046] like Figure 1 As shown, the electronic device 1 includes a display module 10, a middle frame 11 and a battery cover (or rear cover) 12. The middle frame 11 is located between the display module 10 and the battery cover 12.

[0047] The display module 10 is used to display images.

[0048] The display module 10, the middle frame 11 and the battery cover 12 can be arranged in different layers in the thickness direction of the electronic device, and these layers can be parallel to each other. The plane where each layer is located 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, the middle frame 11 and the battery cover 12 can be distributed in layers in the Z direction.

[0049] 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. Thus, the PCB can transmit display data to the display module 10 to control the display module 10 to display images.

[0050] The middle frame 11 is located between the display module 10 and the battery cover 12. The surface of the middle frame 11 away from the display module 10 is used to install internal components such as batteries, printed circuit boards (PCB), cameras, antennas, etc. After the battery cover 12 and the middle frame 11 are covered, the above internal components are located between the battery cover 12 and the middle frame 11.

[0051] The battery cover 12 is connected to the middle frame 11 to form a receiving cavity for receiving the above-mentioned PCB, camera, battery and other electronic components, thereby preventing external moisture and dust from invading the receiving cavity and affecting the performance of the above-mentioned electronic components.

[0052] In some embodiments of the present application, Figure 2 As shown, in some embodiments of the present application, Figure 2As shown, the display module 10 may include a substrate 101 , and the substrate 101 is divided into a plurality of pixel regions P.

[0053] In order to enable the display module 10 to realize color display, in some embodiments of the present application, Figure 2 As shown, each luminescent pixel region p includes at least three luminescent sub-pixels 1030 for displaying three primary colors. The three primary colors can be red (red, R) light, green (green, G) light, and blue (blue, B) light. 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.

[0054] In some embodiments, the arrangement of the R, G, and B primary color light-emitting sub-pixels 1030 can be determined according to the display effect, pixel density (pixels per inch (PPI)) and resolution and other parameters, which are not limited in this application. For example, the arrangement of the pixels 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), and a diamond arrangement.

[0055] by Figure 2 Taking the arrangement of sub-pixels shown in FIG. 1 as an example, the light-emitting sub-pixels arranged in a row along the horizontal direction x are called light-emitting sub-pixels in the same row. The light-emitting sub-pixels arranged in a row along the vertical direction y are called light-emitting sub-pixels in the same column. Figure 2 As shown, the light-emitting sub-pixels in the same column are used to emit light of the same color, for example, the same column is all red light-emitting sub-pixels R. Each light-emitting sub-pixel and the adjacent light-emitting sub-pixel in the same row emit light of different colors. For example, the red light-emitting sub-pixels R, the green light-emitting sub-pixels G, and the blue light-emitting sub-pixels B are alternately arranged along the x direction.

[0056] For the convenience of explanation, the plurality of light-emitting sub-pixels 1030 in this application are Figure 2 The shape and arrangement of the light-emitting sub-pixels 1030 shown in the present application are for illustration only and are not intended to be limiting.

[0057] In some embodiments, Figure 3 As shown, 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, and the driving circuit 102 is used to control the light emitting device 103 to display.

[0058] The substrate 101 may be a transparent glass substrate, or a hard or flexible substrate made of a transparent resin material. Based on this, a TFT (Thin Film Transistor) may be manufactured on the substrate 101, and the driving circuit 102 is a TFT backplane.

[0059] Alternatively, a driving circuit may be directly formed on the substrate through a patterning process. In this case, the driving circuit is a pixel circuit.

[0060] For example, in a possible embodiment, the driving circuit 102 includes a capacitor, a plurality of switching transistors, and a driving circuit.

[0061] In another possible embodiment, the driving circuit 102 includes a capacitor, a switching transistor, and a driving transistor.

[0062] In other embodiments, the driving circuit 102 may also have other structures, and the driving circuit 102 in the embodiment of the present application is only an illustration.

[0063] The following combination Figure 3 The stacking arrangement of the driving circuit 102 and the light emitting device 103 in the display module 10 is described as follows. Figure 3 As shown, the light emitting device 103 is arranged on a side of the driving circuit 102 away from the substrate 101. The light emitting device 103 at least includes: 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 close to the driving circuit 102, and the light emitting material layer 1031 is located between the first electrode 1032 and the second electrode 1033.

[0064] 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).

[0065] In some embodiments, the first electrode 1032 is a laminated structure of indium tin oxide / silver / indium tin oxide (ITO / Ag / ITO), and the silver layer is a total reflection 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 other film structures with total reflection performance.

[0066] In some embodiments, after the driving circuit 102 applies voltage to the first electrode 1032 and the second electrode 1033, the 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 a plurality of the light-emitting devices 103 displays a picture.

[0067] 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.

[0068] 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 MgAg alloy with a molar ratio of 1:10.

[0069] 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 .

[0070] 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.

[0071] 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 .

[0072] The hole transport layer 1035 may be made of a material having high hole mobility, high thermal stability, and good electron and exciton blocking ability. In one embodiment, the material of the hole transport layer 1035 is an organic small molecule material.

[0073] The electron transport layer 1038 is made of a material having high electron mobility, high thermal stability and good hole and exciton blocking capabilities.

[0074] The light-emitting material layer 1031 includes a red light organic light-emitting layer, a green light organic light-emitting layer, and a blue light organic light-emitting layer.

[0075] 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, and 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 uniformly emitted from both sides of the light-emitting material layer 1031.

[0076] In some embodiments, in order to improve the efficiency of electron and hole injection 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.

[0077] In some embodiments, the electron blocking layer 1036 and the luminescent material layer 1031 are subjected to RGB patterning evaporation using a high-precision metal mask (Fine Metal Mask, FMM) to achieve full color. Other layers are evaporated using a common metal mask (Common Metal Mask, CMM mask) and are common layers.

[0078] 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 the surface of the second electrode 1033 away from the substrate 101, and the thin film encapsulation layer 105 is located on the surface of the coupling layer 104 away from the second electrode 1033.

[0079] The coupling layer 104 can be used to converge light and improve the forward light extraction efficiency.

[0080] 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 inorganic layer and the second inorganic layer.

[0081] 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.

[0082] Among them, there are two types of interference in the microcavity structure: Figure 4 The wide-angle interference and Figure 5 The multi-beam interference shown in Figure 4 In the wide-angle interference shown, the light emitted by the light-emitting material layer 1031 is divided into light beam a and light beam b. Light beam a reaches the second electrode 1033, and light beam b is totally reflected by the first electrode 1032 and then reaches the surface of the second electrode 1033, thereby interfering with the previously emitted light beam a.

[0083] like Figure 5 In the multi-beam interference shown in the figure, the light emitted by the light-emitting material layer 1031 is divided into a light beam a and a light beam c after reaching the second electrode 1033. The light beam a is emitted, and the 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.

[0084] Among them, Figure 5 Taking the multi-beam interference shown in the figure as an example, the optical path difference L between beam a and beam c satisfies the following formula:

[0085]

[0086] 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.

[0087] is the optical length of the light-emitting sub-pixel, satisfy:

[0088]

[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 stack of the light-emitting sub-pixel is approximately equal, for example, all are n, then the cavity length of the light-emitting sub-pixel is satisfy:

[0091]

[0092] 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.

[0093] 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.

[0094] In some embodiments, the optical path difference is equal to the light 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

[0095] In other embodiments, when the optical path difference is equal to 2*light-emitting 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

[0096] Figure 6 is a schematic diagram of the curve of luminous efficiency changing with the cavity length of the luminous sub-pixel, such as Figure 6 As shown, for the blue light-emitting sub-pixel B for emitting blue light, when the second microcavity structure is used, the blue light current efficiency is the highest. For the green light-emitting sub-pixel G for emitting green light, when the first microcavity structure is used, the green light current efficiency is the highest. For the red light-emitting sub-pixel R for emitting red light, when the first microcavity structure is used, the red light current efficiency is the highest.

[0097] However, the current OLED display module uses a high-precision metal mask plate for RGB patterning evaporation to achieve full color. In order to reduce costs, Figure 3 As shown, only the light-emitting layer and the electron blocking layer in the display module are patterned, and the other layers are still deposited using a common metal mask plate and are common layers. Therefore, the blue light-emitting sub-pixel, the green light-emitting sub-pixel, and the red light-emitting sub-pixel all use the second microcavity structure, or all use the first microcavity structure, and the optimal light-emitting efficiency cannot be achieved.

[0098] To this end, an embodiment of the present application provides an improved display module, in which blue light-emitting sub-pixels, green light-emitting sub-pixels, and red light-emitting sub-pixels may adopt different microcavity structures to improve the light-emitting efficiency of the display module.

[0099] 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.

[0100] 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.

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

[0102] 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.

[0103] Therefore, 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, and the blue device adopts the second microcavity structure to improve the life of the blue light-emitting sub-pixel and the chromaticity life of the white light.

[0104] The light-emitting sub-pixel using the second microcavity structure satisfies: the spacing between the first electrode 1032 and the second electrode 1033 is 3 / 4λ, where λ is the wavelength of light of the light-emitting sub-pixel.

[0105] In order to realize the second microcavity structure, in some embodiments of the present application, the light emitting device 103 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. Figure 7 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.

[0106] Therefore, the second microcavity structure can be realized by adopting the stacked structure of the light-emitting layer, thereby increasing the life of the light-emitting sub-pixel, realizing the large design of the light-emitting layer of the light-emitting sub-pixel, and improving the chromaticity life.

[0107] For example, Figure 7 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.

[0108] In some embodiments, the first light emitting layer 1030a further includes: a first electron blocking layer 1036a and a first hole blocking layer 1037a.

[0109] 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.

[0110] In some other embodiments, the second light emitting layer further includes: a second electron blocking layer 1036b and a second hole blocking layer 1037b.

[0111] 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 life of the light-emitting sub-pixel.

[0112] 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, and the second electron transport layer 1038b and the second hole blocking layer 1037b are located between the hole second light-emitting material layer 1031b and the electron injection layer 1039.

[0113] In some embodiments, the light-emitting sub-pixel 1030 with 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.

[0114] The electron generation layer 106 is used to generate charges. The hole generation layer 107 is used to generate holes. Thus, by arranging 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.

[0115] In other embodiments of the present application, the hole transport layer 1035 can be used 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.

[0116] For example, in some embodiments, Figure 8 As shown, by adjusting the thickness of the hole transport layer 1035 , the cavity length of the optical microcavity corresponding to the light-emitting sub-pixel 1030 can be controlled, 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.

[0117] Therefore, the second microcavity structure can be realized by adjusting the thickness of the hole transport layer 1035 without setting other stacked layers, thereby reducing the process difficulty.

[0118] Combine the following Figure 9-12 The display module of the embodiment of the present application is described.

[0119] In some embodiments, Fig. 9 As shown, the 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 used to control the red light emitting device 103R, the green light emitting device 103G, and the blue light emitting device 103B to emit light.

[0120] The red light emitting device 103R and the green light emitting device 103G adopt the first microcavity independent (Single) structure design, and the blue light emitting device 103B adopts the first microcavity independent (Single) structure design. Figure 8 The second microcavity shown is designed independently.

[0121] like Fig. 9 As shown, 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 the surface of the driving circuit 102 away from the substrate 101.

[0122] 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.

[0123] 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 stacked along the z direction. The third electrode 1032G is disposed on a surface of the driving circuit 102 away from the substrate 101.

[0124] 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 driving circuit 102 away from the substrate 101.

[0125] 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. Compared with the structures of the red light emitting device 103R and the green light emitting device 103G, the blue light emitting device 103B is different in that the hole transport layer 1035B of the blue light emitting device 103B serves as an adjustment layer, and the thickness of the third hole transport layer 1035B can be adjusted so that the spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light emitting device 103B is 3 / 4 times of the wavelength of blue light.

[0126] 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.

[0127] In some embodiments, Fig. 9 The display module and Figure 3 The display module shown is used in a 6-inch mobile phone with a brightness of 500nit. Fig. 9 The power consumption of the display module is shown as Figure 3 As shown, the power consumption of the display module is 80.3%. Figure 3 Compared to the display module shown, Fig. 9 The luminous efficiency of the display module is increased and the power consumption is reduced by 19.7%.

[0128] In other embodiments, Fig.10 As shown, the red light emitting device 103R and the green light emitting device 103G adopt and Fig. 9 The same first microcavity independent structure, the blue light emitting device 103B adopts Figure 7 The second microcavity tandem structure is shown.

[0129] right Fig.10The structure description of the red light emitting device 103R and the green light emitting device 103G can refer to Fig. 9 Description. Fig.10 The blue light-emitting device 103B in FIG. 1 includes two light-emitting layers, each of which includes a hole transport layer, a light-emitting material layer and an electron transport layer.

[0130] As an 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.

[0131] 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.

[0132] In some embodiments, the first blue light emitting layer further includes: a fourth electron blocking layer 1036B1 and a fourth hole blocking layer 1037B1.

[0133] 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 which are stacked along the z direction.

[0134] In some embodiments, the second blue light emitting layer further includes: a fifth electron blocking layer 1036B2 and a fifth hole blocking layer 1037B2.

[0135] 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, and 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.

[0136] 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, wherein the first electron generation layer 106B and the first hole generation layer 107B are located between the fourth electron transport layer 1038B1 and the fifth hole transport layer 1035B2.

[0137] 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 difference between the blue light emitting device 103B and the red light emitting device 103R and the green light emitting device 103G is that the blue light emitting device 103B adopts a two-layer organic light emitting layer structure, so that the spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light emitting device 103B is 3 / 4 times of the wavelength of blue light.

[0138] 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.

[0139] In some embodiments, Fig.10 The display module and Figure 3 The display module shown is used in a 6-inch mobile phone with a brightness of 500nit. Fig.10 The power consumption of the display module is shown as Figure 3 As shown, the power consumption of the display module is 66.4%. Figure 3 Compared to the display module shown, Fig.10 The luminous efficiency of the display module is increased and the power consumption is reduced by 33.6%.

[0140] 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, and the luminous efficiency is increased. 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, 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 are designed with the same size, and the chromaticity life is increased by 300%, while the chromaticity life of the white light is also improved.

[0141] In other embodiments, Fig.11 As shown, the red light emitting device 103R adopts Fig. 9 , Fig.10 The red light emitting device 103R has the same first microcavity independent structure, and the green light emitting device 103G adopts the same Figure 8 The second microcavity is independently designed, and the blue light emitting device 103B adopts Fig.10 The blue light emitting device 103B has the same second microcavity stacked structure.

[0142] The specific structures of the red light emitting device 103R and the blue light emitting device 103B may refer to the above embodiments and will not be described in detail here.

[0143] 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 in the z direction. The third electrode 1032G is disposed on the surface of the driving circuit 102 away from the substrate 101.

[0144] In this embodiment, the distance 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. Fig.11 Green light emitting device 103G and Fig. 9 and Fig.10 Compared with the structure of the green light emitting device 103G in FIG, the difference is that the sixth hole transport layer 1035G1 of the green light emitting device 103G is used as an adjustment layer, and the thickness of the sixth hole transport layer 1035G1 can be adjusted so that the distance 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 adopts a structure of two layers of organic light emitting layers, so that the distance between the fifth electrode 1032B and the sixth electrode 1033B of the blue light emitting device 103B is 3 / 4 times the wavelength of blue light.

[0145] In some embodiments of this example, the spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light emitting device 103B is 180-220nm, the spacing between the first electrode 1032R and the second electrode 1033R of the red light emitting device 103R is 100-140nm, and the spacing between the third electrode 1032G and the fourth electrode 1033G of the green light emitting device 103G is 180-220nm.

[0146] In some embodiments, Fig.11 The display module and Figure 3 The display module shown is used in a 6-inch mobile phone with a brightness of 500nit. Fig.11 The power consumption of the display module is shown as Figure 3 As shown in the figure, the power consumption of the display module is 79%. Figure 3 Compared to the display module shown, Fig.11 The display module has increased luminous efficiency and reduced power consumption by 21%.

[0147] In the display module of this embodiment, the red light-emitting device 103R adopts a first microcavity independent structure design to increase 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 to improve 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, the chromaticity lifetime is increased by 300%, and the chromaticity lifetime of the white light is also improved.

[0148] In other embodiments, Fig.12 As shown, 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.

[0149] The specific structures of the red light emitting device 103R and the blue light emitting device 103B may refer to the above embodiments and will not be described in detail here.

[0150] Fig.12 The green light-emitting device 103G in FIG. 1 includes two light-emitting layers, each of which includes: a hole transport layer, a light-emitting material layer and an electron transport layer.

[0151] As an 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.

[0152] 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.

[0153] In some embodiments, the first green light emitting layer further includes: a sixth electron blocking layer 1036G1 and a sixth hole blocking layer 1037G1.

[0154] 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.

[0155] In some embodiments, the second green light emitting layer further includes: a seventh electron blocking layer 1036G2 and a seventh hole blocking layer 1037G2.

[0156] 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, and 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.

[0157] 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, wherein the second electron generation layer 106G and the second hole generation layer 107G are located between the sixth electron transport layer 1038G1 and the seventh hole transport layer 1035G2.

[0158] In this embodiment, the distance 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. Fig.12 Green light emitting device 103G and Fig. 9 and Fig.10 Compared with the structure of the green light emitting device 103G, the difference is that the green light emitting device 103G adopts a two-layer organic light emitting layer structure, so that the distance 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 adopts a two-layer organic light emitting layer structure, so that the distance between the fifth electrode 1032B and the sixth electrode 1033B of the blue light emitting device 103B is 3 / 4 times the wavelength of blue light.

[0159] In some embodiments of this example, the spacing between the fifth electrode 1032B and the sixth electrode 1033B of the blue light emitting device 103B is 180-220nm, the spacing between the first electrode 1032R and the second electrode 1033R of the red light emitting device 103R is 100-140nm, and the spacing between the third electrode 1032G and the fourth electrode 1033G of the green light emitting device 103G is 180-220nm.

[0160] In some embodiments, Fig.12 The display module and Figure 3 The display module shown is used in a 6-inch mobile phone with a brightness of 500nit. Fig.12 The power consumption of the display module is shown as Figure 3 As shown in the figure, the power consumption of the display module is 66%. Figure 3 Compared to the display module shown, Fig.12 The display module has increased luminous efficiency and reduced power consumption by 34%.

[0161] In the display module of this embodiment, the red light-emitting device 103R adopts a first microcavity independent structure design to increase 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 to improve 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.

[0162] In other embodiments of the present application, Figure 7 The light-emitting device of the stacked structure shown 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 a preset value, thereby realizing the second microcavity structure of the light-emitting device.

[0163] In some embodiments, the thickness of the first hole blocking layer 1037a and the second hole blocking layer 1037b can be adjusted so that the thickness 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.

[0164] In some embodiments, the thickness of the first hole blocking layer 1037a and the second hole blocking layer 1037b can be adjusted so that the thickness of the first hole blocking layer 1037a and the second hole blocking layer 1037b are different, thereby realizing the second microcavity structure of the light-emitting device.

[0165] The present application provides a display module and an 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 arranged on the substrate, the first electrode, the plurality of light-emitting sub-pixels, and the second electrode are sequentially stacked and arranged on a side of the driving circuit away from the substrate, the plurality of light-emitting sub-pixels are arranged in an array, the second electrode and the first electrode correspond to the plurality of light-emitting sub-pixels; the plurality of light-emitting sub-pixels include: 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 adopt a stacked structure to realize the second microcavity structure, the red light-emitting sub-pixels adopt an independent first microcavity structure, and the green light-emitting sub-pixels adopt 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, the thickness of the third hole transport layer is greater than the thickness of the first hole transport layer, and 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 made the longest, thereby realizing the second microcavity structure. In other embodiments, the blue light-emitting sub-pixel adopts a laminated structure to realize the second microcavity structure, the red light-emitting sub-pixel adopts an independent first microcavity structure, and the green light-emitting sub-pixel adopts a laminated structure to realize the second microcavity structure; in other embodiments, the blue light-emitting sub-pixel adopts a laminated structure to realize the second microcavity structure, the red light-emitting sub-pixel adopts an independent first microcavity structure, and the green light-emitting sub-pixel adopts an independent structure, and the second microcavity structure is realized by changing the thickness of the adjustment layer. Thus, the blue light-emitting sub-pixel adopts the second microcavity structure, the red light-emitting sub-pixel adopts the first microcavity structure, and the green light-emitting sub-pixel adopts the first microcavity structure or the second microcavity structure, which improves the luminous efficiency of the blue light-emitting sub-pixel and the red light-emitting sub-pixel, and improves the life of the blue light-emitting sub-pixel.

[0166] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope 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 of 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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