CN115172618A - Display module assembly, on-vehicle tail lamp and display device - Google Patents

Abstract

The embodiment of the application provides a display module assembly, on-vehicle tail lamp and display device. The display module comprises a substrate base plate, a first metal layer, a light-emitting functional layer, a second metal layer and a reflecting layer, wherein the first metal layer, the light-emitting functional layer, the second metal layer and the reflecting layer are arranged on one side of the substrate base plate, the first metal layer and the second metal layer are respectively arranged on two sides of the light-emitting functional layer, the second metal layer is arranged on one side, far away from the substrate base plate, of the light-emitting functional layer, the reflecting layer is arranged on one side, far away from the light-emitting functional layer, of the second metal layer, the thickness of the second metal layer is smaller than angstroms, and light rays emitted by the light-emitting functional layer are reflected by the reflecting layer and then are emitted out of the substrate base plate. According to the display module assembly in the embodiment of the application, the thickness of second metal level is less than 500 angstroms, can avoid the second metal level because the metal particle that the thickness leads to is excessive thick in forming process to appear, avoids these metal particles and first metal level to take place the short circuit and cause the dark spot to appear in the display panel, moreover, is provided with the reflection stratum in the display module assembly, can further improve display module assembly's display effect.

Description

Display module assembly, on-vehicle tail lamp and display device

Technical Field

The application relates to the technical field of display, in particular to a display module, an on-vehicle tail lamp and a display device.

Background

This section provides background information related to the present application and is not necessarily related art.

An Organic Light-Emitting Diode (OLED) is a common display device, and can also be applied to a vehicle, and in the related art, a dark spot is easily generated on a display panel during the use of a vehicle-mounted OLED, which greatly affects the user experience, how to improve the poor dark spot, and how to improve the display effect of the vehicle-mounted OLED is a problem that needs to be considered at present.

Disclosure of Invention

An object of the embodiment of the application is to provide a display module assembly, on-vehicle tail lamp and display device to improve display module assembly's display effect. The specific technical scheme is as follows:

an embodiment of a first aspect of the present application provides a display module. The display module comprises a substrate base plate, a first metal layer, a light-emitting functional layer, a second metal layer and a reflecting layer, wherein the first metal layer, the light-emitting functional layer, the second metal layer and the reflecting layer are arranged on one side of the substrate base plate, the first metal layer and the second metal layer are respectively arranged on two sides of the light-emitting functional layer, the second metal layer is arranged on one side, far away from the substrate base plate, of the light-emitting functional layer, the reflecting layer is arranged on one side, far away from the light-emitting functional layer, of the second metal layer, and the thickness of the second metal layer is smaller than 500 angstroms.

According to the display module in the embodiment of the application, the first metal layer and the second metal layer are used for injecting holes and electrons into the light-emitting functional layer located between the first metal layer and the second metal layer to enable the light-emitting functional layer to emit light, and light emitted by the light-emitting functional layer is reflected by the reflecting layer and then emitted from the substrate, that is to say, the display module in the embodiment of the application is bottom emission. In the related art, the vehicle-mounted display panel is bottom-emitting, so the cathode has a relatively thick thickness (much greater than 500 angstroms) to reflect light emitted from the light emitting device, and during the cathode forming process, with the increase of the metal thickness in the cathode, metal particles therein are easily separated out, and when the display module operates, the metal particles and the anode are short-circuited, thereby causing dark spots on the display panel. In this embodiment, since the thickness of the second metal layer is less than 500 angstroms, the second metal layer can be prevented from being separated out due to the excessive thickness during the forming process, and dark spots in the display panel caused by the short circuit between the first metal layer and the metal particles can be prevented, so as to improve the display effect of the display module. Moreover, the display module of this embodiment is provided with the reflection stratum therein, can reflect the light that the luminous functional layer sent like this to improve display module's display brightness, further improve display module's display effect.

In addition, according to a display module assembly of this application embodiment, can also have following additional technical feature:

in some embodiments of the present application, the display module further includes an organic layer disposed between the reflective layer and the second metal layer.

In some embodiments of the present application, the organic layer is provided with a first via hole, and the reflective layer is connected to the second metal layer through the first via hole.

In some embodiments of the present application, the display module further includes a first inorganic layer disposed on a side of the reflective layer away from the light-emitting function layer.

In some embodiments of the present application, the display module further includes a planarization layer disposed on a side of the first inorganic layer away from the reflective layer.

In some embodiments of the present application, the display module further includes a first inorganic layer disposed on a side of the reflective layer close to the light emitting function layer.

In some embodiments of the present application, the organic layer is provided with a first through hole, the first inorganic layer is provided with a second through hole, a projection of the first through hole on the substrate base plate and a projection of the second through hole on the substrate base plate have an overlapping region, and the reflective layer is connected to the second metal layer through the first through hole and the second through hole.

In some embodiments of the present application, the display module further includes a planarization layer disposed on a side of the reflective layer away from the first inorganic layer.

In some embodiments of the present application, the display module further includes a second inorganic layer disposed on a side of the planarization layer away from the light-emitting functional layer.

In some embodiments of the present application, the first inorganic layer includes a first sub inorganic layer and a second sub inorganic layer, the first sub inorganic layer and the second sub inorganic layer are stacked, and the reflective layer is disposed between the first sub inorganic layer and the second sub inorganic layer.

In some embodiments of the present application, the first metal layer is an anode layer, the second metal layer is a cathode layer, the display module further includes source and drain electrodes, the source and drain electrodes include a source electrode and a drain electrode, one of the source electrode or the drain electrode is connected to the anode layer, and the other of the source electrode or the drain electrode is connected to the cathode layer.

In some embodiments of the present application, the display module further includes a PI substrate, the PI substrate is disposed on one side of the substrate close to the light emitting functional layer, the source/drain electrode is disposed on one side of the substrate far away from the PI substrate, the first metal layer is disposed on one side of the substrate far away from the PI substrate, a part of the first metal layer is connected to one of the source electrode or the drain electrode, and another part of the first metal layer is connected to the light emitting functional layer.

In some embodiments of the present application, the display module further comprises an insulating layer disposed between the first metal layer and the second metal layer.

In some embodiments of the present application, the second metal layer has a thickness of 100 to 200 angstroms, and the reflective layer has a thickness of 1200 to 1800 angstroms.

In some embodiments of the present application, the display module includes a plurality of pixel units, the pixel units are triangular, the source drain traces are of a mesh structure, and the projection of the display module and the projection of the pixel units do not coincide with each other.

In some embodiments of the present application, the reflective layer has a reflectivity of greater than 97.2% and the second metal layer has a sheet resistance of less than 0.35 Ω/\9633.

In some embodiments of the present application, the display module is a bottom emission display module, and the display module is a non-square display module.

An embodiment of a second aspect of the present application provides an on-vehicle tail light, including the display module in any embodiment of the first aspect.

According to the vehicle-mounted tail lamp in the embodiment of the present application, since the vehicle-mounted tail lamp includes the display module in any one of the embodiments of the first aspect, the vehicle-mounted tail lamp also has the beneficial effects of any one of the embodiments of the first aspect, and details are not repeated herein.

An embodiment of a third aspect of the present application provides a display device, including the display module in any embodiment of the first aspect.

According to the display device in the embodiment of the present application, since the display device includes the display module according to any one of the embodiments of the first aspect, the display device also has the beneficial effects of any one of the embodiments of the first aspect, and details are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and other embodiments can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic structural diagram of a display module according to a first embodiment of the present application;

FIG. 2 is a schematic structural diagram of a display module according to a second embodiment of the present application;

FIG. 3 is a schematic structural diagram of a display module according to a third embodiment of the present application;

FIG. 4 is a schematic structural diagram of a display module according to a fourth embodiment of the present application;

fig. 5 is a schematic view illustrating a distribution of a portion of pixel units of a display module according to an embodiment of the disclosure.

The reference numbers are as follows:

10-pixel cell;

100-substrate base plate; a 110-PI substrate; 210 — a first metal layer; 220-a second metal layer; 300-a light-emitting functional layer; 400-a reflective layer; 510-a first inorganic layer; 520-a second inorganic layer; 600-an organic layer; 700-source drain; 800-a planarization layer; 900-insulating layer.

Detailed Description

In order to more clearly illustrate the embodiments of the present application or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and other embodiments can be obtained by those skilled in the art according to the drawings.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. This spatially relative term is intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.

An Organic Light-Emitting Diode (OLED) is a common display device, and can also be applied to a vehicle, and in the related art, a dark spot is easily generated on a display panel during the use of a vehicle-mounted OLED, which greatly affects the user experience, how to improve the poor dark spot, and how to improve the display effect of the vehicle-mounted OLED is a problem that needs to be considered at present.

As shown in fig. 1, an embodiment of a first aspect of the present application provides a display module. The display module comprises a substrate base plate 100, a first metal layer 210, a light-emitting function layer 300, a second metal layer 220 and a reflection layer 400, wherein the first metal layer 210, the light-emitting function layer 300, the second metal layer 220 and the reflection layer 400 are arranged on one side of the substrate base plate 100, the first metal layer 210 and the second metal layer 220 are respectively arranged on two sides of the light-emitting function layer 300, the second metal layer 220 is arranged on one side, far away from the substrate base plate 100, of the light-emitting function layer 300, the reflection layer 400 is arranged on one side, far away from the light-emitting function layer 300, of the second metal layer 220, and the thickness of the second metal layer 220 is smaller than 500 angstroms.

According to the display module in the embodiment of the present application, the first metal layer 210 and the second metal layer 220 are used for injecting holes and electrons into the light-emitting functional layer 300 located therebetween, so that the light-emitting functional layer 300 emits light, and light emitted from the light-emitting functional layer 300 is reflected by the reflective layer 400 and then emitted from the substrate 100, that is, the display module in the embodiment of the present application is bottom emission. In the related art, the vehicle-mounted display panel is bottom-emitting, so the cathode has a relatively thick thickness (much greater than 500 angstroms) to reflect light emitted from the light emitting device, and during the cathode forming process, with the increase of the metal thickness in the cathode, metal particles therein are easily separated out, and when the display module operates, the metal particles and the anode are short-circuited, thereby causing dark spots on the display panel. In the embodiment, since the thickness of the second metal layer 220 is less than 500 angstroms, the second metal layer 220 can be prevented from being separated out due to an excessively thick thickness during the forming process, and dark spots in the display panel caused by short circuit between the metal particles and the first metal layer can be prevented, so as to improve the display effect of the display module. Moreover, the reflective layer 400 is disposed in the display module of this embodiment, so as to reflect the light emitted from the light-emitting functional layer 300, thereby improving the display brightness of the display module and further improving the display effect of the display module.

In some embodiments, the light emitting function layer 300 may include an Emission layer (EML), an Electron Transport Layer (ETL), an Electron Injection Layer (EIL), a Hole Transport Layer (HTL), and a Hole Injection Layer (HIL). It should be noted that the light-emitting functional layer 300 is not limited to include only the combination of EML, ETL, EIL, HTL, and HIL, and may include other functional layers.

In some specific embodiments, the material of the substrate 100 may be a high-transparency sapphire substrate (Al 2O 3), silicon (Si), silicon carbide (SiC), gallium nitride (GaN), or zinc oxide (ZnO), and the present application is not limited in particular.

In some embodiments, the reflective layer 400 may be made of a metal or alloy with high reflectivity, such as Ag (silver) or a silver alloy.

In some embodiments of the present application, the display module further includes an organic layer 600, and the organic layer 600 is disposed between the reflective layer 400 and the second metal layer 220. In this embodiment, the organic Layer 600 may be a Capping Layer (CPL) having good light transmittance, which can improve the light extraction efficiency of the light emitting function Layer 300.

As shown in fig. 2, in some embodiments of the present application, the organic layer 600 is provided with a first via hole through which the reflective layer 400 is connected with the second metal layer 220. In the preparation of the display module of the present embodiment, the organic layer 600 may be patterned, for example, etched, to form a first through hole on the organic layer 600, and then the reflective layer 400 is formed on the organic layer 600, so that the reflective layer 400 and the second metal layer 220 can be connected together. Through connecting reflection stratum 400 and second metal layer 220, can make reflection stratum 400 as auxiliary cathode to this resistance that reduces second metal layer 220 not only can improve the injection efficiency of electron like this, can also reduce the heat that the display module during operation produced, improves the life-span of display module.

Referring to fig. 1 and fig. 2, in some embodiments of the present disclosure, the display module further includes a first inorganic layer 510, and the first inorganic layer 510 is disposed on a side of the reflective layer 400 away from the light-emitting functional layer 300. In this embodiment, the first inorganic layer 510 may be formed by CVD (Chemical Vapor Deposition), and the material of the first inorganic layer 510 may be SiN or the like. The reflective layer 400 can be well protected from moisture erosion and the like by providing the first inorganic layer 510.

In some embodiments of the present disclosure, the display module further includes a planarization layer 800, and the planarization layer 800 is disposed on a side of the first inorganic layer 510 away from the reflective layer 400. In this embodiment, the planarization layer 800 may be prepared by processes such as inkjet printing or evaporation, and the planarization layer 800 covers the surface of the first inorganic layer 510 to form a good protection for the first inorganic layer 510, and a flat plane may be formed on a side of the planarization layer 800 away from the first inorganic layer 510 to facilitate subsequent processes.

As shown in fig. 3, in another embodiment, the display module further includes a first inorganic layer 510, and the first inorganic layer 510 is disposed on a side of the reflective layer 400 close to the light-emitting functional layer 300. In the present embodiment, the first inorganic layer 510 may be prepared by CVD (Chemical Vapor Deposition), but is not limited thereto. The first inorganic layer 510 may also be disposed on a side of the reflective layer 400 close to the light-emitting functional layer 300, similar to the previous embodiments, the first inorganic layer 510 may also be formed in a deposition manner in this embodiment, and the material of the first inorganic layer 510 may be SiN or the like. The reflective layer 400 can be well protected from moisture attack and the like by providing the first inorganic layer 510.

As shown in fig. 4, in some embodiments of the present application, the organic layer 600 is provided with a first via, the first inorganic layer 510 is provided with a second via, a projection of the first via on the substrate 100 and a projection of the second via on the substrate 100 have an overlapping area, and the reflective layer 400 is connected to the second metal layer 220 through the first via and the second via. For example, when the display module according to the embodiment is manufactured, the organic layer 600 may be patterned, for example, etched, to form a first through hole in the organic layer 600, and then the first inorganic layer 510 is formed on the organic layer 600, or the first inorganic layer 510 may be patterned, for example, etched, and a second through hole is formed in the first inorganic layer 510, and the first through hole and the second through hole have an overlapping region, and when the reflective layer 400 is deposited on the first inorganic layer 510, the material in the reflective layer 400 can pass through the first through hole and the second through hole to be connected to the second metal layer 220. Through connecting reflection stratum 400 and second metal layer 220, can make reflection stratum 400 as the auxiliary cathode to this resistance that reduces second metal layer 220 not only can improve the injection efficiency of electron, can also reduce the heat that the display module during operation produced, improves the life-span of display module like this.

In some embodiments of the present application, the display module further includes a planarization layer 800, and the planarization layer 800 is disposed on a side of the reflective layer 400 far from the first inorganic layer 510. In this embodiment, the planarization layer 800 may be prepared by processes such as inkjet printing or evaporation, and the planarization layer 800 covers the surface of the reflective layer 400 to form a good protection for the reflective layer 400, and a flat plane may be formed on a side of the planarization layer 800 away from the reflective layer 400 to facilitate subsequent processes.

In some embodiments of the present application, the display module further includes a second inorganic layer 520, and the second inorganic layer 520 is disposed on a side of the planarization layer 800 away from the light-emitting function layer 300. In the present embodiment, the second inorganic layer 520 may be prepared by CVD (Chemical Vapor Deposition), but is not limited thereto. The planarization layer 800 can prevent the relevant components of the display module from being exposed, so as to achieve the effect of protecting the components.

In some embodiments of the present application, the first inorganic layer 510 includes a first sub inorganic layer and a second sub inorganic layer, which are stacked, and the reflective layer 400 is disposed between the first sub inorganic layer and the second sub inorganic layer. In a specific embodiment, in the preparation of the display module, after the second metal layer 220 is formed, the organic layer 600 may be formed on the second metal layer 220, then the first inorganic sub-layer may be formed on the organic layer 600, the thickness of the first inorganic sub-layer is not required to be too thick and only plays a role of protection, then the reflective layer 400 may be formed on the first inorganic sub-layer, and finally the second inorganic sub-layer may be formed on the reflective layer 400, so that the reflective layer 400 may be sandwiched between the first inorganic sub-layer and the second inorganic sub-layer to protect the reflective layer 400 well, and the reflective effect of the reflective layer 400 may not be affected.

In some embodiments of the present disclosure, the first metal layer 210 is an anode layer, the second metal layer 220 is a cathode layer, the display module further includes a source and a drain 700, the source and the drain 700 includes a source and a drain, one of the source or the drain is connected to the anode layer, and the other of the source or the drain is connected to the cathode layer. In the present embodiment, when the first metal layer 210 is an anode layer, the material thereof may be ITO (indium tin oxide) or IZO (indium zinc oxide), and both of them are transparent and have good light transmittance, so that the display module has good light emitting efficiency. When the second metal layer 220 is a cathode layer, the material thereof may be, but is not limited to, magnesium, silver, magnesium-silver alloy, and the like.

In some embodiments of the present application, the display module further includes a PI substrate 110, the PI substrate 110 is disposed on a side of the substrate base 100 close to the light-emitting function layer 300, the source/drain 700 is disposed on a side of the PI substrate 110 away from the substrate base 100, the first metal layer 210 is disposed on a side of the PI substrate 110 away from the substrate base 100, a portion of the first metal layer 210 is connected to one of the source or the drain, and another portion of the first metal layer 210 is connected to the light-emitting function layer 300. In this embodiment, the PI substrate 110 is also called Polyimide (PI for short), which is a material with the best temperature resistance among existing polymer materials, and has excellent chemical stability and mechanical properties, so that when the source/drain 700 and the first metal layer 210 are formed on one side of the PI substrate 110, a chemical reaction between the source/drain 700 and the surface of the first metal layer 210 can be avoided.

In some embodiments of the present application, the display module further includes an insulating layer 900, and the insulating layer 900 is disposed between the first metal layer 210 and the second metal layer 220. In this embodiment, the insulating layer 900 may be made of zinc oxide (ZnO), silicon nitride (SiNx), or silicon oxide (SiO) ₂ ) Polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), and the like, the insulating Layer 900 can be generally prepared by CVD (Chemical Vapor Deposition) or ALD (Atomic Layer Deposition).

In some embodiments of the present application, the second metal layer 210 has a thickness of 100 to 200 angstroms, and the reflective layer 400 has a thickness of 1200 to 1800 angstroms. In the embodiment, the thickness of the second metal layer 210 is less than 500 angstroms, such as 200 angstroms, 250 angstroms, 300 angstroms, 350 angstroms, 400 angstroms, etc., and the thickness of the reflective layer 400 may be 1000 angstroms to 2000 angstroms. After long-term research and repeated demonstration, when the thickness of the second metal layer 210 is 100 to 200 angstroms and the thickness of the reflective layer 400 is 1200 to 1800 angstroms, the reflective efficiency of the display module can be improved, and when the reflective layer 400 is connected with the cathode layer, the reflective layer 400 can also be used as an auxiliary cathode, so that the resistance of the cathode layer can be reduced. In one embodiment, the thickness of the second metal layer 210 is 120 angstroms, and the thickness of the reflective layer 400 is 1500 angstroms, so that the display module can achieve better reflection efficiency and significantly reduce the resistance of the cathode layer when the reflective layer 400 is connected with the cathode layer as an auxiliary cathode.

As shown in fig. 5, in some embodiments of the present application, the display module includes a plurality of pixel units 10, the pixel units 10 are triangular, the traces of the source/drain 700 are in a mesh structure, and a projection of the traces of the source/drain 700 on the display module is not overlapped with a projection of the opening of the pixel unit 10 on the display module. In this embodiment, the display module includes a display area and a non-display area, and the pixel unit 10 in this embodiment is located in the display area. The pixel unit 10 can control one of the three primary colors of red, blue, green, and blue, and of course, the pixel unit 10 can include a plurality of sub-pixel units 10, and the sub-pixel units 10 can control the three primary colors of red, green, and blue, respectively. The pixel units 10 are triangular in shape and are arranged in the display area of the display module in an array arrangement manner. The projection of the trace of the source/drain 700 (SD) on the display module does not coincide with the projection of the opening of the pixel unit 10 on the display module, that is, the trace of the source/drain 700 is a mesh trace, and is not overlapped with the opening of the pixel unit 10, so that the light extraction rate of the display module can be improved.

In some embodiments of the present application, the reflectivity of the reflective layer 400 is greater than 97.2% and the sheet resistance of the second metal layer 220 is less than 0.35 Ω/\9633. In this embodiment, the thickness of the reflective layer 400 and the thickness of the second metal layer 220 can be designed according to the actual design requirement, and only the reflectivity of the display module is required to be greater than 97.2%, and the sheet resistance of the second metal layer 220 is required to be less than 0.35 (Ω/\9633;), so that the display module has a higher light emitting efficiency, and the display effect of the display module is increased. In a comparative example, the second metal layer in this embodiment is Ag, the thickness of the second metal layer is 120 angstroms, the thickness of the reflective layer 400 is 1500 angstroms, the cathode layer in the reference example is Ag, the thickness of the cathode layer is 1200 angstroms, and research data shows that the reflectivity of the cathode layer in the reference example is 97.14%, the reflectivity of the reflective layer 400 in this embodiment is 97.36%, the sheet resistance of the cathode layer in the reference example is 0.38 (Ω/\963333), the sheet resistance of the cathode layer in this embodiment is 0.31 (Ω/\9633), that is, the display module in this embodiment not only has better light emitting efficiency, but also can reduce the resistance of the cathode layer, thereby not only improving the injection efficiency of electrons, but also reducing the heat generated during the operation of the display module and improving the lifetime of the display module.

In some embodiments of the present application, the display module is a bottom emission display module, the display module being a non-square display module. In this embodiment, the first metal layer 210 and the second metal layer 220 are used for injecting holes and electrons into the light-emitting functional layer 300 located therebetween, so that the light-emitting functional layer 300 emits light, and light emitted from the light-emitting functional layer 300 is reflected by the reflective layer 400 and then emitted from the substrate 100, that is, the display module of this embodiment is bottom emission. The shape of the display module can be quadrilateral, such as parallelogram, rhombus, etc., and the shape of the display module can also be regular shape such as circle, ellipse, etc., in some specific embodiments, the shape of the display module is rhombus, the pixel units 10 in the display module are triangle, the pixel units 10 are arranged in the display area of the display module in an array manner, and each pixel unit 10 can be controlled independently, so the display module can display simple patterns, and when the display module is applied to the vehicle-mounted tail lamp, the steering arrow of the steering lamp can be displayed.

An embodiment of a second aspect of the present application provides an on-vehicle tail light, including the display module in any embodiment of the first aspect.

The vehicle-mounted tail lamp is applied to the tail of a vehicle and used for displaying an indicator lamp. According to the vehicle-mounted tail lamp in the embodiment of the application, since the vehicle-mounted tail lamp comprises the display module in any embodiment of the first aspect, the vehicle-mounted tail lamp also has the beneficial effects of any embodiment of the first aspect. Specifically, the first metal layer 210 and the second metal layer 220 in the display module are used for injecting holes and electrons into the light-emitting functional layer 300 located therebetween, so that the light-emitting functional layer 300 emits light, and light emitted by the light-emitting functional layer 300 is reflected by the reflective layer 400 and then emitted from the substrate 100, that is, the display module of the present embodiment is bottom emission. In the related art, the vehicle-mounted display panel is bottom-emitting, so the cathode has a relatively thick thickness (much greater than 500 angstroms) to reflect light emitted from the light emitting device, and during the cathode forming process, as the thickness of metal in the cathode increases, metal particles therein are easily separated out, and when the display module operates, the metal particles and the anode are shorted, thereby causing dark spots on the display panel. In the embodiment, since the thickness of the second metal layer 220 is less than 500 angstroms, the second metal layer 220 can be prevented from being separated out due to an excessively thick thickness during the forming process, and dark spots in the display panel caused by short circuit between the metal particles and the first metal layer 210 can be prevented, so as to improve the display effect of the display module. Moreover, the reflective layer 400 is disposed in the display module of this embodiment, so as to reflect the light emitted from the light-emitting functional layer 300, thereby improving the display brightness of the display module, further improving the display effect of the display module, and the vehicle-mounted tail lamp with the display module also has a better display effect.

An embodiment of a third aspect of the present application provides a display device, including the display module in any embodiment of the first aspect.

According to the display device in the embodiment of the application, since the display module includes the display module in any one of the embodiments of the first aspect, the display module also has the beneficial effects of any one of the embodiments of the first aspect, specifically, the first metal layer 210 and the second metal layer 220 in the display module are used for injecting holes and electrons into the light-emitting functional layer 300 located therebetween, so that the light-emitting functional layer 300 emits light, and light emitted from the light-emitting functional layer 300 is reflected by the reflective layer 400 and then emitted from the substrate 100, that is, the display module in this embodiment is bottom emission. In the related art, the vehicle-mounted display panel is bottom-emitting, so the cathode has a relatively thick thickness (much greater than 500 angstroms) to reflect light emitted from the light emitting device, and during the cathode forming process, as the thickness of metal in the cathode increases, metal particles therein are easily separated out, and when the display module operates, the metal particles and the anode are shorted, thereby causing dark spots on the display panel. In the embodiment, since the thickness of the second metal layer 220 is less than 500 angstroms, the second metal layer 220 can be prevented from being separated out due to an excessively thick thickness during the forming process, and dark spots in the display panel caused by short circuit between the metal particles and the first metal layer 210 can be prevented, so as to improve the display effect of the display module. Moreover, the reflective layer 400 is disposed in the display module of this embodiment, so as to reflect the light emitted from the light-emitting functional layer 300, thereby improving the display brightness of the display module, further improving the display effect of the display module, and the display device having the display module also has a better display effect.

It should be noted that, the display device in this embodiment may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.

It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element may also be present. Like reference numerals refer to like elements throughout.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The embodiments of the present application are described in a related manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on differences from other embodiments.

The above description is only for the preferred embodiment of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (19)

1. The display module is characterized by comprising a substrate base plate, a first metal layer, a light-emitting functional layer, a second metal layer and a reflecting layer, wherein the first metal layer, the light-emitting functional layer, the second metal layer and the reflecting layer are arranged on one side of the substrate base plate, the first metal layer and the second metal layer are respectively arranged on two sides of the light-emitting functional layer, the second metal layer is arranged on one side, away from the substrate base plate, of the light-emitting functional layer, the reflecting layer is arranged on one side, away from the light-emitting functional layer, of the second metal layer, and the thickness of the second metal layer is smaller than 500 angstroms.

2. The display module of claim 1, further comprising an organic layer disposed between the reflective layer and the second metal layer.

3. The display module according to claim 2, wherein the organic layer is provided with a first via hole, and the reflective layer is connected to the second metal layer through the first via hole.

4. The display module according to claim 2, further comprising a first inorganic layer disposed on a side of the reflective layer away from the light-emitting functional layer.

5. The display module according to claim 4, further comprising a planarization layer disposed on a side of the first inorganic layer away from the reflective layer.

6. The display module according to claim 2, further comprising a first inorganic layer disposed on a side of the reflective layer adjacent to the light-emitting functional layer.

7. The display module according to claim 6, wherein the organic layer is provided with a first via hole, the first inorganic layer is provided with a second via hole, a projection of the first via hole on the substrate base plate and a projection of the second via hole on the substrate base plate have an overlapping region, and the reflective layer is connected to the second metal layer through the first via hole and the second via hole.

8. The display module according to claim 6, further comprising a planarization layer disposed on a side of the reflective layer away from the first inorganic layer.

9. The display module according to any one of claims 5 or 8, further comprising a second inorganic layer disposed on a side of the planarization layer away from the light-emitting functional layer.

10. The display module according to claim 4, wherein the first inorganic layer comprises a first sub-inorganic layer and a second sub-inorganic layer, the first sub-inorganic layer and the second sub-inorganic layer are stacked, and the reflective layer is disposed between the first sub-inorganic layer and the second sub-inorganic layer.

11. The display module of claim 1, wherein the first metal layer is an anode layer, the second metal layer is a cathode layer, the display module further comprises source and drain electrodes, the source and drain electrodes comprise a source electrode and a drain electrode, one of the source electrode or the drain electrode is connected with the anode layer, and the other of the source electrode or the drain electrode is connected with the cathode layer.

12. The display module according to claim 11, further comprising a PI substrate, wherein the PI substrate is disposed on a side of the substrate close to the light emitting function layer, the source and drain electrodes are disposed on a side of the PI substrate away from the substrate, the first metal layer is disposed on a side of the PI substrate away from the substrate, a portion of the first metal layer is connected to one of the source or the drain, and a portion of the first metal layer is connected to the light emitting function layer.

13. The display module of claim 1, further comprising an insulating layer disposed between the first metal layer and the second metal layer.

14. The display module of claim 1, wherein the second metal layer has a thickness of 100 to 200 angstroms, and the reflective layer has a thickness of 1200 to 1800 angstroms.

15. The display module according to claim 11, wherein the display module comprises a plurality of pixel units, the pixel units are triangular, the source and drain traces are of a mesh structure, and a projection of the source and drain traces on the display module is not coincident with a projection of the opening of the pixel unit on the display module.

16. The display module of any one of claims 3 or 7, wherein the reflective layer has a reflectivity of greater than 97.2% and the sheet resistance of the second metal layer is less than 0.35 Ω/\9633.

17. The display module of claim 1, wherein the display module is a bottom emission display module and the display module is a non-square display module.

18. A vehicle-mounted tail light, characterized by comprising the display module according to any one of claims 1 to 17.

19. A display device, comprising the display module according to any one of claims 1 to 17.

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