CN111816791A - Display substrate and display device - Google Patents

Display substrate and display device Download PDF

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Publication number
CN111816791A
CN111816791A CN202010827055.5A CN202010827055A CN111816791A CN 111816791 A CN111816791 A CN 111816791A CN 202010827055 A CN202010827055 A CN 202010827055A CN 111816791 A CN111816791 A CN 111816791A
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China
Prior art keywords
electrode
display
layer
electrode layer
substrate
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Granted
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CN202010827055.5A
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CN111816791B (en
Inventor
王涛
崔越
孙韬
张子予
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H10K50/816—Multilayers, e.g. transparent multilayers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/828—Transparent cathodes, e.g. comprising thin metal layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The embodiment of the invention provides a display substrate and a display device, relates to the technical field of display, and can solve the problem of color cast of a picture displayed in a first display area; the first electrode layer comprises a plurality of first electrode patterns which are arranged on the flexible substrate and positioned in the first display area; the light-emitting layer comprises a plurality of first light-emitting patterns which are arranged on the first electrode layer and positioned in the first display area; one of the first light emitting patterns is connected to one of the first electrode patterns; a second electrode layer covering the first electrode layer and the light emitting layer; at least one of a portion of the second electrode layer located in the first display region and the first electrode pattern is a transparent electrode.

Description

Display substrate and display device
Technical Field
The application relates to the technical field of display, in particular to a display substrate and a display device.
Background
Currently, Organic Light-Emitting diodes (OLEDs) are widely used in the display technology field due to their advantages of self-luminescence, low power consumption, wide color gamut, and flexible display.
However, when the viewer views the images in the bending region and the non-bending region, the degree of color shift of the image viewed in the bending region is severe due to the microcavity effect and the viewing angle, that is, the bending region has a yellow and green phenomenon.
Disclosure of Invention
Embodiments of the present application provide a display substrate and a display device, which can solve a problem that a color cast exists in a picture displayed in a first display area.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in one aspect, a display substrate is provided, the display substrate having a first display area; the display substrate includes: the light emitting device comprises a flexible substrate, a first electrode layer, a light emitting layer and a second electrode layer; the first electrode layer comprises a plurality of first electrode patterns which are arranged on the flexible substrate and positioned in the first display area; the light-emitting layer comprises a plurality of first light-emitting patterns which are arranged on the first electrode layer and positioned in the first display area; one of the first light emitting patterns is connected to one of the first electrode patterns; a second electrode layer covering the first electrode layer and the light emitting layer; at least one of a portion of the second electrode layer located in the first display region and the first electrode pattern is a transparent electrode.
In some embodiments, the display substrate further has a second display region; the first electrode layer further comprises a plurality of second electrode patterns which are arranged on the flexible substrate and located in the second display area; the second electrode pattern comprises a first transparent electrode block and a first metal electrode block which are arranged in a stacked mode; the light emitting layer further includes a plurality of second light emitting patterns in the second display region; one of the second light emitting patterns is connected to one of the second electrode patterns.
In some embodiments, the first electrode pattern includes a second transparent electrode block and a second metal electrode block which are stacked; the second electrode layer comprises a metal film and a transparent conductive film; the metal film is positioned in the second display area and covers the second electrode pattern and the second light-emitting pattern, and the transparent conductive film is positioned on one side of the metal film, which is far away from the flexible substrate, and covers the first electrode layer and the light-emitting layer; the material of the transparent conductive film comprises at least one of aluminum-doped zinc oxide and indium zinc oxide.
In some embodiments, the first transparent electrode block and the second transparent electrode block are both close to the flexible substrate and are made of the same material in the same layer; the first metal electrode block and the second metal electrode block are both far away from the flexible substrate and are made of the same material on the same layer.
In some embodiments, the second electrode layer is located at a portion of the first display region, and the first electrode pattern is a transparent electrode; the material of the first electrode pattern includes indium tin oxide; the second electrode layer comprises a metal film and a transparent conductive film; the metal film is positioned in the second display area and covers the second electrode pattern and the second light-emitting pattern, and the transparent conductive film is positioned on one side of the metal film, which is far away from the flexible substrate, and covers the first electrode layer and the light-emitting layer; the transparent conductive film is made of at least one of aluminum-doped zinc oxide and indium zinc oxide.
In some embodiments, the first electrode pattern is a transparent electrode; the material of the first electrode pattern includes indium tin oxide; the second electrode layer comprises a metal film; the metal thin film covers the first electrode layer and the light emitting layer.
In some embodiments, the transparent conductive film has a refractive index ranging from 1.5 to 1.7.
In some embodiments, the transparent conductive film has a thickness ranging from 30nm to 40 nm.
In another aspect, a display device is provided, which includes the display substrate as described above.
In some embodiments, in the case that the display substrate further has a second display area, a portion of the display substrate located in the second display area is flat; the display substrate is positioned in the first display area and arched towards one side far away from the non-display surface of the display substrate.
The display substrate provided by the embodiment of the invention is characterized in that the first electrode layer is arranged on the flexible substrate, the light emitting layer is arranged on the first electrode layer, and the second electrode layer covers the first electrode layer and the light emitting layer, namely the light emitting layer is positioned between the first electrode layer and the second electrode layer, so that the first electrode layer and the second electrode layer can form an electric field for driving the light emitting layer to emit light. Meanwhile, the first electrode layer comprises a plurality of first electrode patterns positioned in the first display area, the first display area is a bending area, on the basis, at least one of the part of the second electrode layer positioned in the first display area and the first electrode patterns is arranged to be a transparent electrode, namely, at least one of the second electrode layer positioned in the bending area and the first electrode patterns is made of a material which does not comprise a metal material, so that the reflection function is not provided between the second electrode layer positioned in the first display area and the first electrode patterns, and thus, the microcavity effect between the second electrode layer and the first electrode patterns can be broken through the transparent electrode, and the problem of color cast of the picture displayed in the first display area is effectively solved.
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 following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating region division of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display device according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a color shift phenomenon occurring in a bending region of a display device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display substrate according to an embodiment of the invention;
FIG. 9 is a schematic view of another display substrate according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another display substrate according to an embodiment of the disclosure.
Detailed Description
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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
Further, in this application, directional terms such as "upper," "lower," "left," "right," and the like may be used in a generic and descriptive sense only and not for purposes of limitation, with respect to the orientation of components in the figures, but also with respect to the orientation of components in the figures.
In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate.
The embodiment of the invention provides a display device which is an electroluminescent display device. The electroluminescent Display device may be an Organic electroluminescent Display device (Organic Light-Emitting Diode Display, abbreviated as OLED); the display device may also be a Quantum Dot Light Emitting diode display (QLED).
As shown in fig. 1, the main structure of the display device 100 includes a frame 1, a cover plate 2, a display panel 3, a circuit board 4, and other components. In the case where the display device is a flexible display device, the display panel 3 is a flexible display panel.
The longitudinal section of the frame 1 is U-shaped, the display panel 3, the circuit board 4 and other accessories are all arranged in the frame 1, the circuit board 4 is arranged below the display panel 3 (i.e. the back face, the face deviating from the display face of the display panel 3), and the cover plate 2 is arranged on one side of the display panel 3 far away from the circuit board 4.
It should be noted that the Circuit Board 4 is electrically connected to the display panel 3, and the Circuit Board 4 generally includes a Flexible Printed Circuit (FPC), a driver chip (IC), a Printed Circuit Board (PCB), a connection substrate, and the like; the circuit board 4 is used to supply various display screen information to the display panel 3 after power is turned on.
As shown in fig. 2, the display panel 3 is divided into a display Area a1(Active Area, abbreviated as AA Area) and a peripheral Area a2 located at least on one side of the display Area a1, and fig. 2 illustrates that the display Area a1 is surrounded by the peripheral Area a 2. The display area a1 may be defined as an area in which a picture is displayed, and the peripheral area a2 may be defined as an area in which a picture is not displayed. The display area a1 includes a plurality of subpixels P. The peripheral region a2 is used for wiring, and the gate driver circuit may be provided in the peripheral region a 2.
As shown in fig. 3, the display panel 3 includes a display substrate 31 and an encapsulation layer 32 for encapsulating the display substrate 31. Here, the encapsulation layer 32 may be an encapsulation film; or may be a package substrate. When the sealing layer 32 is a sealing film, the number of layers of the sealing film included in the sealing layer 32 is not limited, and the sealing layer 32 may include one layer of the sealing film, or the sealing layer 32 may include two or more layers of the sealing film stacked. In some embodiments, encapsulation layer 32 comprises three layers of encapsulation film disposed in a sequential stack.
In the case that the encapsulation layer 32 includes three encapsulation films sequentially stacked, optionally, the encapsulation film located in the middle layer is made of an organic material, and the encapsulation films located at both sides are made of an inorganic material.
Here, the organic material is not limited, and the organic material may be, for example, PMMA (polymethyl methacrylate). The inorganic material is not limited, and may be one or more of SiNx (silicon nitride), SiOx (silicon oxide), or SiOxNy (silicon oxynitride), for example.
On the basis, the encapsulation film located in the intermediate layer can be manufactured by using an Ink Jet Printer (IJP for short). Further, the encapsulation films on both sides can be formed by Chemical Vapor Deposition (CVD).
It should be noted that the display device 100 provided in the embodiment of the present invention is a flexible display device. The flexible display device has the property of being bendable or rollable.
Referring to fig. 4, 5 and 6, for example, the display device 100 has a first display area a11, and the first display area a11 is a bending area. On this basis, it should be understood that the display device 100 also has the second display region a12, and the first display region a11 and the second display region a12 each correspond to the display region a1 of the display panel 3.
Meanwhile, the display substrate 31 also has a first display area a11 and a second display area a12, and the first display area a11 is a bending area.
In some embodiments, as shown in fig. 4, the display device 100 is flat (i.e. not bent, refer to the left diagram of fig. 4) when sold, and after sold, the user determines whether to bend according to the user's requirement. Referring to the right diagram of fig. 4, the display device 100 is bent in the area (the first display area a11) where the picture is displayed. For example, when the terminal device of the display device 100 is a mobile phone (folding screen), the terminal device is folded at a middle position of the mobile phone (i.e., folded in half). At the same time, the display substrate 31 is also bent at the first display area a11 shown in fig. 4. In other words, the first display area a11 is a dynamic bending area.
In some embodiments, as shown in fig. 5, the terminal equipment of the display apparatus 100 is a curved television. The curved surface television is a television with a screen with a certain curvature and a certain curved surface shape. Referring to fig. 5, the display device 100 is gradually curved from the central axis L' to the two side edges. At this time, the display device 100 only has the first display region a11, the first display region a11 is a bending region, and the first display region a11 corresponds to the display region a 1. That is, the display area a1 of the display device 100 is entirely a bent area.
In the case that the display substrate 31 also has the second display area a12, in some embodiments, as shown in fig. 6, a portion of the display substrate 31 located in the second display area a12 is flat; the portion of the display substrate 31 located in the first display region a11 is curved to the side away from the non-display surface of the display substrate 31.
The non-display surface of the display substrate 31 is the back surface of the display substrate 31, and is away from the display surface of the display substrate 31.
Referring again to fig. 6, for example, when the terminal device of the display apparatus 100 is a mobile phone, the terminal device may also be referred to as a curved screen, and when the display apparatus 100 is sold, the display apparatus 100 has a fixed bending region at the position of both side edges. Meanwhile, the display substrate 31 is also bent at the edge area shown in fig. 6, that is, the first display area a11 of the display substrate 31 is a static bending area.
Referring to the structure of the display device 100 shown in fig. 4, 5 and 6, the display device 100 described in fig. 4, 5 and 6 in the embodiment of the present invention may be any product or component with a display function, such as a mobile phone, a television, a computer, a wearable device, and the like.
The application scene of the display device 100 provided in the embodiment of the present invention may be any scene that needs to be displayed by using the flexible display device 100, such as a living room, a bedroom, a kitchen appliance, a bathroom, a building advertisement, a cinema, a meeting place, and a marine venue.
It should be noted that the above is merely an illustration of specific products and application scenarios of the display device 100, and it should be understood that the specific products and application scenarios of the display device 100 according to the embodiment of the present invention include, but are not limited to, the above examples, and other suitable products and application scenarios are within the scope of the embodiment of the present invention.
In the electroluminescent display device, the microcavity effect can be used to provide the electroluminescent display device with good luminous efficiency. Taking the display device 100 as a top-emission display device as an example, the microcavity effect is specifically as follows: the anode of the light emitting device is a total reflection electrode, the cathode is a semi-transparent semi-reflective electrode, and at this time, light emitted from the light emitting layer is reflected and transmitted between the anode and the cathode for multiple times, and light emitted from the light emitting surface (cathode surface) interferes with each other. Due to the existence of the microcavity effect, only light with a specific wavelength can be emitted at a specific angle after conforming to a resonant cavity mode, so that the half-peak width of the light wave can be narrowed, and the light intensity and the wavelength at different observation angles can be different.
On the basis, after the display device 100 is bent, the viewing angle of the display device 100 is increased relative to that before the bending, and the light intensity and the wavelength of the bending region B2 are changed due to the microcavity effect. Referring to fig. 7, it can be seen that, under the same viewing angle, the cavity length L1 of the non-bending region B1 is different from the cavity length L2 of the bending region B2, that is, the wavelength of light emitted by the light emitting layer in the non-bending region B1 is different from the wavelength of light emitted by the light emitting layer in the bending region B2, so that a user may have color cast when viewing a picture displayed in the non-bending region B1 and viewing a picture displayed in the bending region B2, that is, the picture displayed in the bending region B2 may have a yellow-green phenomenon.
Accordingly, the embodiment of the invention provides a display substrate 31, which can be applied to the display panel 3. As shown in fig. 8, 9, and 10, the display substrate 31 includes a flexible substrate 310, a first electrode layer 311, a second electrode layer 312, and a light-emitting layer 313.
The first electrode layer 311 includes a plurality of first electrode patterns 3111 disposed on the flexible substrate 310 and located in the first display region a 11; the light emitting layer 313 includes a plurality of first light emitting patterns 3131 disposed on the first electrode layer 311 and positioned in the first display area a11, one first light emitting pattern 3131 connected to one first electrode pattern 3111; the second electrode layer 312 covers the first electrode layer 311 and the light emitting layer 313, and at least one of a portion of the second electrode layer 312 positioned in the first display region a11 and the first electrode pattern 3111 is a transparent electrode.
For example, the material of the flexible substrate 310 may be one of Polyimide (PI), Polyethylene terephthalate (PET), cellulose Triacetate (TAC), Cyclic Olefin Polymer (COP), or Polyimide (CPI), or other suitable materials, which is not limited in the embodiments of the invention.
Referring to fig. 8, 9 and 10 again, the display substrate 31 further includes a pixel defining layer 314, the pixel defining layer 314 includes a plurality of opening portions defining pixel regions, one opening portion exposes one first electrode pattern 3111, and one first light emitting pattern 3131 is positioned in one opening portion.
In some embodiments, the display substrate 31 further includes one or more of an Electron Transport Layer (ETL), an Electron Injection Layer (EIL), a Hole Transport Layer (HTL), and a Hole Injection Layer (HIL) in addition to the light emitting layer 313.
On this basis, in the case where the display substrate 31 includes only the light emitting layer 313, one first light emitting pattern 3131 is directly connected to one first electrode pattern 3111. In the case where the display substrate 31 further includes an electron transport layer, an electron injection layer, a hole transport layer, and a hole injection layer, one first light emitting pattern 3131 is indirectly connected to one first electrode pattern 3111.
In some embodiments, the first electrode layer 311 is an anode, and the second electrode layer 312 is a cathode, in which case, one first light emitting pattern 3131 is connected to one first electrode pattern 3111 through at least one of a hole transport layer and a hole injection layer.
In other embodiments, the first electrode layer 311 is a cathode and the second electrode layer 312 is an anode, in which case, one first light emitting pattern 3131 is connected to one first electrode pattern 3111 through at least one of an electron transport layer and an electron injection layer.
In the embodiment of the present invention, the definition of the "transparent electrode" is as follows: a portion of the second electrode layer 312 positioned at the first display area a11 and the material of the first electrode pattern 3111 do not include a metal material.
In some embodiments, a portion of the second electrode layer 312 located in the first display region a11 is a transparent electrode. In other embodiments, the first electrode pattern 3111 is a transparent electrode. In still other embodiments, the portion of the second electrode layer 312 in the first display region a11 and the first electrode pattern 3111 are both transparent electrodes.
With the display substrate 31 provided by the embodiment of the invention, the first electrode layer 311 is disposed on the flexible substrate 310, the light emitting layer 313 is disposed on the first electrode layer 311, and the second electrode layer 312 covers the first electrode layer 311 and the light emitting layer 313, that is, the light emitting layer 313 is located between the first electrode layer 311 and the second electrode layer 312, so that the first electrode layer 311 and the second electrode layer 312 can form an electric field for driving the light emitting layer 313 to emit light. Meanwhile, the first electrode layer 311 includes a plurality of first electrode patterns 3111 located in the first display area a11, and the first display area a11 is a bending area, and on this basis, at least one of the portion of the second electrode layer 312 located in the first display area a11 and the first electrode patterns 3111 is a transparent electrode, that is, at least one of the second electrode layer 312 and the first electrode patterns 3111 located in the bending area is made of a material that does not include a metal material, so that a reflective function is not provided between the second electrode layer 312 located in the first display area a11 and the first electrode patterns 3111, and thus, a microcavity effect between the second electrode layer 312 and the first electrode patterns 3111 can be broken through the transparent electrode, thereby effectively improving the problem that a picture displayed in the first display area a11 has color cast.
In some embodiments, referring to fig. 8, 9 and 10, the first electrode layer 311 further includes a plurality of second electrode patterns 3112 disposed on the flexible substrate 310 and located in the second display region a 12; the light emitting layer 313 further includes a plurality of second light emitting patterns 3132 positioned in the second display area a12, one second light emitting pattern 3132 being connected with one second electrode pattern 3112; the second electrode pattern 3112 includes a first transparent electrode block 3112a and a first metal electrode block 3112b stacked on each other.
Illustratively, the material of the first transparent electrode block 3112a is ITO (Indium Tin Oxide); the material of the first metal electrode block 3112b is Ag (silver).
In some embodiments, the second electrode pattern 3112 includes two first transparent electrode blocks 3112a, i.e., the material of the second electrode pattern 3112 includes three layers of ITO/Ag/ITO sequentially stacked.
For the case that one second light-emitting pattern 3132 is connected to one second electrode pattern 3112, reference may be made to the description of the connection between one first light-emitting pattern 3131 and one first electrode pattern 3111 in the above embodiments, which is not repeated herein.
In some embodiments, as shown in fig. 8, the first electrode pattern 3111 includes a second transparent electrode block 3111a and a second metal electrode block 3111b which are stacked; the second electrode layer 312 includes a metal thin film 3121 and a transparent conductive thin film 3122; the metal film 3121 is positioned at the second display region a12 and covers the second electrode pattern 3112 and the second light emitting pattern 3132, and the transparent conductive film 3122 is positioned at a side of the metal film 3121 away from the flexible substrate 310 and covers the first electrode layer 311 and the light emitting layer 313; the material of the transparent conductive film 3122 includes at least one of Aluminum-doped Zinc Oxide (AZO for short) and Indium Zinc Oxide (IZO for short).
It should be noted that, in the embodiments of the present invention, the first electrode layer 311 is taken as an anode, and the second electrode layer is taken as a cathode, and since the work function of the anode is greater than that of the cathode, it should be understood by those skilled in the art that the work function of indium tin oxide is greater than that of aluminum-doped zinc oxide and indium zinc oxide, so that the material of the first electrode layer 311 is indium tin oxide, and the material of the second electrode layer 312 is at least one of aluminum-doped zinc oxide and indium zinc oxide.
For example, the material of the second electrode layer 312 may be one of aluminum-doped zinc oxide or indium zinc oxide; alternatively, the material of the second electrode layer 312 may be selected from a mixture of aluminum-doped zinc oxide and indium zinc oxide.
Materials of the second transparent electrode block 3111a and the second metal electrode block 3111b may refer to the illustrations in the above embodiments, and are not repeated here.
In second electrode pattern 3112 and first electrode pattern 3111, first transparent electrode block 3112a and first metal electrode block 3112b included in second electrode pattern 3112 are stacked; the second transparent electrode block 3111a and the second metal electrode block 3111b included in the first electrode pattern 3111 are stacked, and in some embodiments, the first transparent electrode block 3112a and the second transparent electrode block 3111a are both close to the flexible substrate 310 and are made of the same material in the same layer; the first metal electrode block 3112b and the second metal electrode block 3111b are both far away from the flexible substrate 310 and are made of the same material.
The "same layer" refers to a layer structure formed by performing a patterning process once using the same mask plate after the same film forming process is used to form a film layer having a specific pattern. Depending on the specific pattern, the single patterning process may include multiple exposure, development or etching processes, and the specific pattern in the formed layer structure may be continuous or discontinuous, and the specific patterns may be at different heights or have different thicknesses. "same material", as the name implies, is the same material for the two different layer structures. For example, the materials of the first transparent electrode block 3112a and the second transparent electrode block 3111a are the same and are all indium tin oxide; the first metal electrode block 3112b and the second metal electrode block 3111b are made of the same material and are made of silver.
Referring to fig. 8, in the first electrode layer 311, the materials of the first electrode pattern 3111 at the first display region a11 and the second electrode pattern 3112 at the second display region a12 each include a metal material; in the second electrode layer 312, the second electrode layer 312 located in the first display area a11 is a transparent conductive film 3122, and the second electrode layer 312 located in the second display area a12 includes a metal film 3121, in which case, the portion of the second electrode layer 312 located in the first display area a11 is a transparent electrode, so that no reflection function exists between the second electrode layer 312 located in the first display area a11 and the first electrode pattern 3111, thereby effectively improving the problem of color cast of the image displayed in the first display area a 11.
In addition, the transparent conductive film 3122 is located on the side of the metal film 3121 away from the flexible substrate 310 and covers the first electrode layer 311 and the light emitting layer 313, that is, the transparent conductive film 3122 is a whole layer and covers the metal film 3121, so that the transparent conductive film 3122 and the metal film 3121 have a good electrical connection relationship, and thus the second electrode layer 312 can be prevented from being broken.
In some embodiments, as shown in fig. 9, the second electrode layer 312 is positioned at a portion of the first display region a11, and the first electrode pattern 3111 is a transparent electrode; the second electrode layer 312 includes a metal thin film 3121 and a transparent conductive thin film 3122; the metal film 3121 is positioned at the second display region a12 and covers the second electrode pattern 3112 and the second light emitting pattern 3132, and the transparent conductive film 3122 is positioned at a side of the metal film 3121 away from the flexible substrate 310 and covers the first electrode layer 311 and the light emitting layer 313; a material of the first electrode pattern 3111 includes indium tin oxide; the material of the transparent conductive film 3122 includes at least one of aluminum-doped zinc oxide and indium zinc oxide.
Illustratively, the material of the transparent conductive film 3122 may be one of aluminum-doped zinc oxide or indium zinc oxide; alternatively, the material of the transparent conductive film 3122 may be a mixture of aluminum-doped zinc oxide and indium zinc oxide.
Referring to fig. 9, the transparent conductive film 3122 is located on a side of the metal film 3121 away from the flexible substrate 310, and covers the first electrode layer 311 and the light emitting layer 313, that is, the transparent conductive film 3122 is an entire layer, and on this basis, since a portion of the second electrode layer 312 located in the first display region a11 is a transparent electrode, in the second electrode layer 312, the transparent electrode located in the first display region a11 is the transparent conductive film 3122, that is, the material of the transparent electrode located in the first display region a11 of the second electrode layer 312 includes at least one of aluminum-doped zinc oxide and indium zinc oxide; and a material of the transparent electrode in the first electrode pattern 3111 includes indium tin oxide.
In the above embodiment, the second electrode layer 312 is located in the first display area a11, and the first electrode pattern 3111 is a transparent electrode, in this case, the first electrode layer 311 and the second electrode layer 312 located in the first display area a11 are both transparent electrodes, so that the first electrode layer 311 and the second electrode layer 312 located in the first display area a11 do not have a reflection function, that is, the microcavity effect between the first electrode layer 311 and the second electrode layer 312 located in the first display area a11 can be broken, and the color cast problem of the picture displayed in the first display area a11 can be effectively improved.
In some embodiments, as shown in fig. 10, the first electrode pattern 3111 is a transparent electrode; the second electrode layer 312 includes a metal thin film 3121, the metal thin film 3121 covering the first electrode layer 311 and the light emitting layer 313; the first electrode pattern 3111 includes indium tin oxide.
Since the first electrode pattern 3111 is located in the first display area a11, that is, the portion of the first electrode layer 311 located in the first display area a11 is a transparent electrode, and the second electrode layer 312 is a whole metal film 3121, in this case, the reflective function between the first electrode layer 311 and the second electrode layer 312 located in the first display area a11 is not provided, that is, the microcavity effect between the first electrode layer 311 and the second electrode layer 312 located in the first display area a11 can be broken, so that the color cast of the picture displayed in the first display area a11 can be effectively improved.
Referring to fig. 8, 9 and 10, the first electrode layer 311 and the second electrode layer 312 located in the second display area a12, in the first electrode layer 311, the second electrode pattern 3112 includes a first transparent electrode block 3112a and a first metal electrode block 3112 b; the second electrode layer 312 includes a metal thin film 3121, so that a reflection function is provided between the first electrode layer 311 and the second electrode layer 312 positioned in the second display region a12 (non-bending region), i.e., the microcavity effect is maintained in the second display region a12, ensures that the second display region a12 displays a high gamut of pictures, so that the second display region a12 has good display effect, and in the first display region a11, since there is no reflection function between the first electrode layer 311 and the second electrode layer 312, that is, the microcavity effect of the first display region a11 is broken, and the half-peak width of the spectrum of light emitted from the light-emitting layer 313 exiting from the first display region a11 is increased, when the user views the display screen at the same viewing angle, the viewing angle can be increased, that is, when the user views the display screen at the same viewing angle, the color shift phenomenon of the second display area a12 is weakened, and the display effect is good in the second display area a 12.
In combination with any of the above embodiments, the transparent conductive film 3122 has a refractive index in a range of 1.5 to 1.7.
Illustratively, the transparent conductive film 3122 has refractive indices of 1.5, 1.6, 1.7.
It should be noted that, the transparent conductive film 3122 is located between the light-emitting layer 313 and the encapsulation layer 32, and when the refractive index of the transparent conductive film 3122 is in a range from 1.5 to 1.7, in some embodiments, the refractive index of the transparent conductive film 3122 is located between the refractive index of the light-emitting layer 313 and the refractive index of the encapsulation layer 32, that is, the refractive index of the light-emitting layer 313, the refractive index of the transparent conductive film 3122, and the refractive index of the encapsulation layer 32 exhibit a tendency of high or low, and in the first display area a11, the relationship between the refractive indices of the light-emitting layer 313, the transparent conductive film 3122, and the encapsulation layer 32 can compensate for the problem of low color gamut caused by microcavity loss, so that the light extraction efficiency can be improved, and the.
In combination with any of the above embodiments, the transparent conductive film 3122 has a thickness ranging from 30nm to 40 nm.
Illustratively, the thickness of the transparent conductive film 3122 is 30nm, 35nm, 40 nm.
Based on the above, the material of the transparent conductive film 3122 includes at least one of aluminum-doped zinc oxide and indium zinc oxide, and on this basis, the transparent conductive film 3122 may be formed by using an Atomic Layer Deposition (ALD) method, so that the thickness of the transparent conductive film 3122 is relatively thin, thereby making the thickness of the entire display device 100 relatively thin, which is beneficial to making the display device 100 light and thin.
Moreover, in the case that the encapsulation layer 32 is an encapsulation film, after the transparent electrical film 3122 is formed by using an atomic layer deposition apparatus, the encapsulation film may be continuously deposited in the same chamber to form the encapsulation layer 32, which is beneficial to saving the process time for preparing the display device 100.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A display substrate is characterized by comprising a first display area; the display substrate includes:
a flexible substrate;
a first electrode layer including a plurality of first electrode patterns disposed on the flexible substrate and located in the first display region;
the light-emitting layer comprises a plurality of first light-emitting patterns which are arranged on the first electrode layer and positioned in the first display area; one of the first light emitting patterns is connected to one of the first electrode patterns;
a second electrode layer covering the first electrode layer and the light emitting layer; at least one of a portion of the second electrode layer located in the first display region and the first electrode pattern is a transparent electrode.
2. The display substrate of claim 1, wherein the display substrate further has a second display region;
the first electrode layer further comprises a plurality of second electrode patterns which are arranged on the flexible substrate and located in the second display area; the second electrode pattern comprises a first transparent electrode block and a first metal electrode block which are arranged in a stacked mode;
the light emitting layer further includes a plurality of second light emitting patterns in the second display region; one of the second light emitting patterns is connected to one of the second electrode patterns.
3. The display substrate of claim 2,
the first electrode pattern comprises a second transparent electrode block and a second metal electrode block which are arranged in a stacked mode;
the second electrode layer comprises a metal film and a transparent conductive film; the metal film is positioned in the second display area and covers the second electrode pattern and the second light-emitting pattern, and the transparent conductive film is positioned on one side of the metal film, which is far away from the flexible substrate, and covers the first electrode layer and the light-emitting layer;
the material of the transparent conductive film comprises at least one of aluminum-doped zinc oxide and indium zinc oxide.
4. The display substrate of claim 3,
the first transparent electrode block and the second transparent electrode block are both close to the flexible substrate and are made of the same material on the same layer;
the first metal electrode block and the second metal electrode block are both far away from the flexible substrate and are made of the same material on the same layer.
5. The display substrate of claim 2,
the second electrode layer is positioned in the part of the first display area, and the first electrode pattern is a transparent electrode; the material of the first electrode pattern includes indium tin oxide;
the second electrode layer comprises a metal film and a transparent conductive film; the metal film is positioned in the second display area and covers the second electrode pattern and the second light-emitting pattern, and the transparent conductive film is positioned on one side of the metal film, which is far away from the flexible substrate, and covers the first electrode layer and the light-emitting layer; the transparent conductive film is made of at least one of aluminum-doped zinc oxide and indium zinc oxide.
6. The display substrate of claim 2,
the first electrode pattern is a transparent electrode; the material of the first electrode pattern includes indium tin oxide;
the second electrode layer comprises a metal film; the metal thin film covers the first electrode layer and the light emitting layer.
7. The display substrate according to any one of claims 1 to 6, wherein the transparent conductive film has a refractive index in a range of 1.5 to 1.7.
8. The display substrate according to any one of claims 1 to 6, wherein the transparent conductive film has a thickness in a range of 30nm to 40 nm.
9. A display device comprising the display substrate according to any one of claims 1 to 8.
10. The display device according to claim 9, wherein in a case where the display substrate further has a second display region, a portion of the display substrate located in the second display region is flat; the display substrate is positioned in the first display area and arched towards one side far away from the non-display surface of the display substrate.
CN202010827055.5A 2020-08-17 2020-08-17 Display substrate and display device Active CN111816791B (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
CN104201290A (en) * 2014-08-22 2014-12-10 上海和辉光电有限公司 Inverted type organic electroluminescence structure
CN104425563A (en) * 2013-09-09 2015-03-18 三星显示有限公司 Organic light emitting diode display
CN110265462A (en) * 2019-06-27 2019-09-20 昆山国显光电有限公司 A kind of display panel and display device
CN111490081A (en) * 2020-04-17 2020-08-04 京东方科技集团股份有限公司 Display panel and display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104425563A (en) * 2013-09-09 2015-03-18 三星显示有限公司 Organic light emitting diode display
CN104201290A (en) * 2014-08-22 2014-12-10 上海和辉光电有限公司 Inverted type organic electroluminescence structure
CN110265462A (en) * 2019-06-27 2019-09-20 昆山国显光电有限公司 A kind of display panel and display device
CN111490081A (en) * 2020-04-17 2020-08-04 京东方科技集团股份有限公司 Display panel and display device

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