Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device. The display panel comprises a substrate, a light-emitting layer and a packaging layer which are stacked in sequence, the light-emitting layer comprises a plurality of pixel units, each pixel unit comprises a plurality of sub-pixel units, and each sub-pixel unit is used for emitting visible light of one color. The display panel further comprises an ultraviolet conversion layer which is arranged between the packaging layer and the light-emitting layer or arranged on the side, away from the light-emitting layer, of the packaging layer, the ultraviolet conversion layer comprises a plurality of quantum dot units, each quantum dot unit covers at least one sub-pixel unit, and each quantum dot unit is used for converting incident ultraviolet light into visible light and emitting the visible light. Therefore, the display panel has the characteristics of low power consumption and high color purity.

Description

Technical Field

[0001] The present application relates to the field of display technology, and more specifically, to a display panel and a method for preparing the same, and a display device. Background Art

[0002] Organic light emitting diode (OLED) is a current-type organic light-emitting device. Its light-emitting principle is: under the action of an electric field, the cathode of OLED generates electrons, the anode generates holes, the electrons and holes are injected into the light-emitting layer, and they recombine therein to cause light emission. OLED has the advantages of small thickness, light weight, good shock resistance, good low-temperature characteristics, high luminous efficiency, wide color gamut coverage, and large viewing angle, so it is widely used in the display field.

[0003] Low power consumption and high color purity are two important indicators of OLED display panel performance. Among them, one way to reduce the power consumption of OLED display panels is to increase the light extraction rate of OLED display panels. High color purity corresponds to the display effect requirements of devices. In order to improve the high color purity of OLED display panels, existing OLED display panels mostly use external ultraviolet absorption film layers, or add absorbents to the production of one or more photoresist materials of OLED display panels. However, this will greatly reduce the light transmittance of OLED display panels, thereby making the light extraction rate of OLED display panels also low. Summary of the invention

[0004] The present application provides a display panel and a method for manufacturing the same, and a display device. The display panel and the display device have the characteristics of low power consumption and high color purity.

[0005] In a first aspect, a display panel is provided, the display panel comprising a substrate, a light-emitting layer and an encapsulation layer stacked in sequence, the light-emitting layer comprising a plurality of pixel units, each pixel unit comprising a plurality of sub-pixel units, each sub-pixel unit being used to emit visible light of a color. The display panel further comprises an ultraviolet conversion layer, which is arranged between the encapsulation layer and the light-emitting layer or on a side of the encapsulation layer away from the light-emitting layer, the ultraviolet conversion layer comprising a plurality of quantum dot units, each quantum dot unit covering at least one sub-pixel unit, each quantum dot unit being used to convert incident ultraviolet light into visible light and emit it.

[0006] When external ultraviolet light enters the display panel, each quantum dot unit in the ultraviolet light conversion layer can convert the external ultraviolet light into visible light. On the one hand, a part of the visible light converted by the ultraviolet light conversion layer enters the layer below the ultraviolet light conversion layer in the display panel. In this way, the ultraviolet light in the layer below the ultraviolet light conversion layer in the display panel can be reduced, reducing the adverse effects of external ultraviolet rays on the internal materials of the display panel's devices, thereby improving the display panel's anti-aging ability, extending the service life of the display panel, and making the display panel have the characteristics of high color purity. On the other hand, another part of the visible light converted by the ultraviolet light conversion layer is emitted from the display panel, which can improve the light output efficiency of the display panel, making the display panel have the characteristics of low power consumption.

[0007] In combination with the first aspect, in certain implementations of the first aspect, each quantum dot unit covers a sub-pixel unit, and the color of the visible light converted by each quantum dot unit is the same as the color of the visible light emitted by a sub-pixel unit covered by each quantum dot unit.

[0008] The color of visible light converted from external ultraviolet light by each quantum dot unit in the ultraviolet light conversion layer is the same as the color of visible light emitted by a sub-pixel unit covered by each quantum dot unit. In this way, there is no need to individually adjust the wavelength of light emitted by the sub-pixel unit in the light-emitting layer, thereby avoiding color deviation of the display panel.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the surface of the ultraviolet conversion layer facing away from the light-emitting layer includes multiple groups of grooves, and the multiple groups of grooves are arranged at intervals along the arrangement direction of the multiple pixel units. Each group of grooves includes multiple grooves, and the multiple grooves are arranged at intervals along the arrangement direction of multiple sub-pixel units of a pixel unit. Each groove is used to fill with quantum dot material corresponding to the color of visible light converted by each quantum dot unit to form each quantum dot unit.

[0010] In combination with the first aspect, in certain implementations of the first aspect, each quantum dot unit covers a pixel unit, and the color of the visible light converted by each quantum dot unit is the same.

[0011] Each quantum dot unit of the ultraviolet light conversion layer converts external ultraviolet light into visible light of the same color, thus simplifying the processing technology of the ultraviolet light conversion layer. Even if the display panel has color deviation, it can be overcome by simply adjusting the wavelength of the light emitted by the sub-pixel unit in the light-emitting layer.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the color of the visible light converted by each quantum dot unit is the same as the color of the visible light emitted by a sub-pixel unit in the pixel unit covered by each quantum dot unit.

[0013] Each quantum dot unit in the ultraviolet light conversion layer converts external ultraviolet light into visible light of the same color as the visible light emitted by a sub-pixel unit in the pixel unit covered by each quantum dot unit, and emits it into the layer below the ultraviolet light conversion layer in the display panel. In this way, when the display panel produces color deviation, the number of times the wavelength of the light emitted by the sub-pixel unit in the light-emitting layer is adjusted can be reduced.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the visible light converted by each quantum dot unit is blue light.

[0015] When external ultraviolet light enters the display panel, each quantum dot unit in the ultraviolet light conversion layer can convert the external ultraviolet light into blue light and inject it into the layer below the ultraviolet light conversion layer in the display panel. In this way, the device life problem caused by the short life of the blue light-emitting material can be improved.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the surface of the ultraviolet conversion layer facing away from the light-emitting layer includes a plurality of grooves, and the plurality of grooves are spaced apart along the arrangement direction of the plurality of pixel units, and each groove is used to fill a quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit.

[0017] In combination with the first aspect, in some implementations of the first aspect, the display panel further includes: a planarization layer, and the planarization layer is disposed on a side of the ultraviolet conversion layer away from the light-emitting layer.

[0018] The planarization layer can compensate for the thickness difference of the ultraviolet light conversion layer, making the display panel easier to package.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the display panel also includes: a color filter layer, the color filter layer is arranged on the side of the encapsulation layer away from the light-emitting layer, the color filter layer includes a plurality of filter units, each filter unit covers a sub-pixel unit, and the color corresponding to each filter unit is the same as the color of visible light emitted by the sub-pixel unit covered by each filter unit.

[0020] Since the ultraviolet light in the layers below the ultraviolet light conversion layer in the display panel can be reduced, that is, the ultraviolet light incident on the color filter layer can be reduced, this can reduce the risk of photolysis, photooxidation-reduction or photoaging of the organic material in the color filter layer due to long-term exposure to external ultraviolet light.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the quantum dot material used in a quantum dot unit among the multiple quantum dot units includes one or more of the following composite materials: ZnCl2, ZnO, Zn3As2, Zn3N2, GaCl3, Ga2O3, GaAs, GaN, MgCl2, MgO, Mg3As2, Mg3N2, PbCl2, PbO, Pb3As2, Pb3N2, and the visible light converted by the quantum dot unit corresponding to red light includes red light with a peak wavelength of 620nm-750nm.

[0022] The quantum dot material used by another quantum dot unit among the multiple quantum dot units includes one or more of the following composite materials: Na3P, Na3As, Na3As, Na2S, Fe3P, Fe2As, FeSb, FeSb2, Fe2S3, InP, InAs, InSb, In2S3, PbP, PbAs, PbSb, Pb2S3, Mn3P2, MnAs, Mn2Sb, MnS, Cs3P, Cs3As, Cs3Sb, Cs2S, and the visible light converted by the quantum dot unit corresponding to green light includes green light with a peak wavelength of 500nm-580nm.

[0023] The quantum dot material used in another quantum dot unit among the multiple quantum dot units includes one or more of the following composite materials: CdSe, ZnS, ZnSe, ZnT, polymer quantum dots, carbon quantum dots, and the visible light converted by the quantum dot unit corresponding to blue light includes blue light with a peak wavelength of 430nm-460nm.

[0024] In a second aspect, a method for preparing a display panel is provided, the preparation method comprising: providing a substrate; making a light-emitting layer on the substrate, the light-emitting layer comprising a plurality of pixel units, each pixel unit comprising a plurality of sub-pixel units, each sub-pixel unit being used to emit visible light of a color; making an encapsulation layer on the light-emitting layer and making an ultraviolet conversion layer on the encapsulation layer, or making an ultraviolet conversion layer on the light-emitting layer and making an encapsulation layer on the ultraviolet conversion layer, wherein the ultraviolet conversion layer comprises a plurality of quantum dot units, each quantum dot unit covers at least one sub-pixel unit, and each quantum dot unit is used to convert incident ultraviolet light into visible light and emit it.

[0025] In combination with the second aspect, in certain implementations of the second aspect, making an ultraviolet conversion layer includes: providing a substrate or a glass cover plate; setting an optical functional layer on a surface of the substrate or the glass cover plate facing away from the light-emitting layer; etching a plurality of grooves on a surface of the optical functional layer facing away from the substrate at positions corresponding to a plurality of sub-pixel units; filling each groove with a quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit, the color of the visible light converted by each quantum dot unit being the same as the color of the visible light emitted by a sub-pixel unit covered by each quantum dot unit.

[0026] In combination with the second aspect, in certain implementations of the second aspect, making an ultraviolet conversion layer includes: providing a substrate or a glass cover plate; setting an optical functional layer on a surface of the substrate or the glass cover plate facing away from the light-emitting layer; etching a plurality of grooves on a surface of the optical functional layer facing away from the substrate at positions corresponding to a plurality of pixel units; filling each groove with a quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit, and the color of the visible light converted by each quantum dot unit is the same.

[0027] The ultraviolet conversion layer is manufactured on the glass cover plate of the display panel itself, thus, the thickness of the display panel will not be increased extra, and the manufacturing cost of the display panel is also reduced.

[0028] A separate substrate is used to make the ultraviolet conversion layer, which will not damage the original structure of the display panel and will not affect other performances of the display panel.

[0029] In combination with the second aspect, in certain implementations of the second aspect, the color of the visible light converted by each quantum dot unit is the same as the color of the visible light emitted by a sub-pixel unit in the pixel unit covered by each quantum dot unit.

[0030] In combination with the second aspect, in certain implementations of the second aspect, filling each groove with quantum dot material corresponding to the color of visible light converted by each quantum dot unit to form each quantum dot unit includes: filling each groove with blue quantum dot material to form each quantum dot unit.

[0031] In combination with the second aspect, in certain implementations of the second aspect, the preparation method also includes: forming a planarization layer on the ultraviolet conversion layer; forming a color filter layer on the encapsulation layer, the color filter layer including a plurality of filter units, each filter unit covering a sub-pixel unit, and the color corresponding to each filter unit is the same as the color of visible light emitted by the sub-pixel unit covered by each filter unit.

[0032] In combination with the second aspect, in certain implementations of the second aspect, forming a color filter layer on the encapsulation layer includes: forming a plurality of black matrices by an etching process on a side of the encapsulation layer away from the substrate and at a position corresponding to the interval between any two adjacent sub-pixel units; and forming a plurality of filter units between any two adjacent black matrices by evaporation or deposition of a transparent color film technology.

[0033] The technical effects of the second aspect and any implementation method of the second aspect can be referred to the corresponding description of the first aspect and will not be repeated here.

[0034] In a third aspect, a display device is provided, comprising a display panel as described in the first aspect or any possible implementation manner of the first aspect.

[0035] The technical effects of the third aspect can refer to the corresponding description of the first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present application.

[0037] Figure 2 A schematic diagram of the structure of another display panel provided in an embodiment of the present application.

[0038] Figure 3 External ultraviolet rays Figure 1 Schematic diagram of light behind the display panel shown.

[0039] Figure 4 External ultraviolet rays Figure 2 Schematic diagram of light behind the display panel shown.

[0040] Figure 5 A schematic diagram of the structure of another display panel provided in an embodiment of the present application.

[0041] Figure 6 A method for preparing a display panel is provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0043] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms such as the third person singular form "comprises" and the present participle form "comprising" are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics can be included in any one or more embodiments or examples in any appropriate manner.

[0044] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more than two.

[0045] The directional words that appear in the following description are all directions shown in the figures, and do not limit the specific structures in the embodiments of the present application. In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0046] Mentioning "embodiment" in the embodiments of the present application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0047] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0048] The up and down directions involved in the embodiments of the present application may also be referred to as vertical directions, and the left and right directions may also be referred to as horizontal directions. The up and down directions, left and right directions, and front and back directions are perpendicular to each other.

[0049] As described in the background art, the existing OLED display panel cannot achieve the two characteristics of low power consumption and high color purity at the same time. Therefore, the embodiment of the present application provides a display panel that can achieve the two characteristics of low power consumption and high color purity at the same time.

[0050] Combine the following Figures 1 to 5 The structure of the display panel provided in the embodiment of the present application is described in detail.

[0051] Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present application. Figure 2 The structural diagram of another display panel provided in the embodiment of the present application is an organic light emitting diode (OLED) display panel.

[0052] like Figure 1 and Figure 2 As shown, the display panel 100 includes a substrate, a light emitting layer 105, an encapsulation layer 107 and an ultraviolet conversion layer 110. The substrate, the light emitting layer 105 and the encapsulation layer 107 are stacked in sequence.

[0053] For the convenience of description, the direction in which the substrate, the encapsulation layer 107 and the light-emitting layer 105 are stacked is referred to as the up-down direction.

[0054] In some embodiments, such as Figure 1 As shown, the substrate includes a substrate 101 and a substrate 102. The substrate 102 includes a driving circuit. In some embodiments, the substrate includes one of the substrate 101 and the substrate 102.

[0055] It should be noted that the substrate 101 can be a rigid substrate or a flexible substrate, and the materials used for the substrate 101 include but are not limited to glass and polyimide. In addition, the substrate 102 can be a rigid substrate or a flexible substrate, and the materials used for the substrate 102 include but are not limited to glass and polyimide.

[0056] The light emitting layer 105 includes a plurality of pixel units, each of which includes a plurality of sub-pixel units, and each sub-pixel unit is used to emit visible light of one color. Figure 1 and Figure 2As shown, each pixel unit of the light-emitting layer 105 includes a red light sub-pixel unit 1051, a green light sub-pixel unit 1052 and a blue light sub-pixel unit 1053. The red light sub-pixel unit 1051 emits red visible light, i.e., red light; the green light sub-pixel unit 1052 emits green visible light, i.e., green light; and the blue light sub-pixel unit 1053 emits blue visible light, i.e., blue light.

[0057] In some embodiments, the cross-section of each sub-pixel unit of the light emitting layer 105 along the up-down direction is in the shape of an inverted trapezoid.

[0058] The ultraviolet conversion layer 110 is disposed on both sides of the encapsulation layer 107. For example, the ultraviolet conversion layer 110 is disposed between the encapsulation layer 107 and the light-emitting layer 105. Figure 1 As shown, the ultraviolet conversion layer 110 is disposed on a side of the encapsulation layer 107 away from the light-emitting layer 105 .

[0059] The ultraviolet conversion layer 110 includes a plurality of quantum dot units. One quantum dot unit covers at least one sub-pixel unit in the up and down directions. Each quantum dot unit is used to convert incident ultraviolet light into visible light and emit it.

[0060] The specific structure of the ultraviolet conversion layer 110 provided in the embodiments of the present application is described in detail below by taking Embodiment 1 and Embodiment 2 as examples.

[0061] Embodiment 1: Each quantum dot unit covers a sub-pixel unit in the up-down direction, and the color of the visible light converted by each quantum dot unit is the same as the color of the visible light emitted by a sub-pixel unit covered by each quantum dot unit. In this embodiment, the number of quantum dot units in the ultraviolet light conversion layer 110 is equal to the number of sub-pixel units in each pixel unit of the light-emitting layer 105.

[0062] For example, Figure 1 As shown, the ultraviolet conversion layer 110 includes a red light quantum dot unit 1101, a green light quantum dot unit 1102, and a blue light quantum dot unit 1103. Among them, the red light quantum dot unit 1101 can convert the incident ultraviolet light into red light and emit it, the green light quantum dot unit 1102 can convert the incident ultraviolet light into green light and emit it, and the blue light quantum dot unit 1103 can convert the incident ultraviolet light into blue light and emit it. The red light quantum dot unit 1101 covers the red light sub-pixel unit 1051 in the up-down direction, the green light quantum dot unit 1102 covers the green light sub-pixel unit 1052 in the up-down direction, and the blue light quantum dot unit 1103 covers the blue light sub-pixel unit 1053 in the up-down direction.

[0063] like Figure 3As shown, when external ultraviolet light A enters the ultraviolet light conversion layer 110, the red light quantum dot unit 1101 is excited to convert the external ultraviolet light A into red light, a portion of the red light B1 is emitted downward, and another portion of the red light C1 is emitted upward from the ultraviolet light conversion layer 110. The green light quantum dot unit 1102 is excited to convert the external ultraviolet light A into green light, a portion of the green light B2 is emitted downward, and another portion of the green light C2 is emitted upward from the ultraviolet light conversion layer 110. The blue light quantum dot unit 1103 is excited to convert the external ultraviolet light A into blue light, a portion of the blue light B3 is emitted downward, and another portion of the blue light C3 is emitted upward from the ultraviolet light conversion layer 110.

[0064] In this way, the ultraviolet light in the layer below the ultraviolet light conversion layer 110 in the display panel 100 can be reduced, reducing the adverse effects of external ultraviolet light on the internal materials of the devices of the display panel 100, thereby improving the anti-aging ability of the display panel 100, extending the service life of the display panel 100, and making the display panel 100 have the characteristics of high color purity. In addition, the other part of the red light C1, the other part of the green light C2 and the other part of the blue light C3 emitted upward can improve the light extraction efficiency of the display panel 100, so that the display panel 100 has the characteristics of low power consumption.

[0065] In one example, the ultraviolet conversion layer 110 includes a substrate, and the surface of the substrate facing away from the light-emitting layer 105 includes a plurality of groups of grooves, and the plurality of groups of grooves are arranged at intervals along the arrangement direction of the plurality of pixel units. Each group of grooves includes a plurality of grooves, and the plurality of grooves are arranged at intervals along the arrangement direction of the plurality of sub-pixel units of a pixel unit, and each groove is used to fill the quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit.

[0066] like Figure 1 As shown, the ultraviolet conversion layer 110 includes a substrate 109, and the surface of the substrate 109 facing away from the light-emitting layer 105 includes multiple groups of grooves, and the multiple groups of grooves are arranged at intervals in the front-to-back direction. Each group of grooves includes three grooves G1-G3, and the three grooves G1-G3 are arranged at intervals in the left-right direction. The groove G1 is used to fill the red light quantum dot material to form the red light quantum dot unit 1101, the groove G2 is used to fill the green light quantum dot material to form the green light quantum dot unit 1102, and the groove G3 is used to fill the blue light quantum dot material to form the blue light quantum dot unit 1103.

[0067] In another example, the ultraviolet conversion layer 110 is a cover plate of the display panel 100, and the surface of the cover plate facing away from the light-emitting layer 105 includes multiple groups of grooves, and the multiple groups of grooves are arranged at intervals along the arrangement direction of multiple pixel units. Each group of grooves includes multiple grooves, and the multiple grooves are arranged at intervals along the arrangement direction of multiple sub-pixel units of a pixel unit, and each groove is used to fill the quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit.

[0068] Exemplarily, the quantum dot material used in the red light quantum dot unit, that is, the red light quantum dot material includes one or more of the following composite materials: ZnCl2, ZnO, Zn3As2, Zn3N2, GaCl3, Ga2O3, GaAs, GaN, MgCl2, MgO, Mg3As2, Mg3N2, PbCl2, PbO, Pb3As2, Pb3N2. The visible light converted by the red light quantum dot unit 1101 includes red light with a peak wavelength of 620nm-750nm.

[0069] For example, the red light quantum dot material includes Ga2O3 and Zn3As2, or the red light quantum dot material includes Ga2O3 and ZnO, and the visible light converted by the red light quantum dot material includes red light with a peak wavelength of 620nm-660nm.

[0070] Exemplarily, the quantum dot material used in the green light quantum dot unit, that is, the green light quantum dot material includes one or more of the following composite materials: Na3P, Na3As, Na3As, Na2S, Fe3P, Fe2As, FeSb, FeSb2, Fe2S3, InP, InAs, InSb, In2S3, PbP, PbAs, PbSb, Pb2S3, Mn3P2, MnAs, Mn2Sb, MnS, Cs3P, Cs3As, Cs3Sb, Cs2S. The visible light converted by the green light quantum dot unit 1102 includes green light with a peak wavelength of 500nm-580nm.

[0071] For example, the green light quantum dot material includes In2S3 and MnS, and the visible light converted by the green light quantum dot material includes green light with a peak wavelength of 520nm-550nm.

[0072] Exemplarily, the quantum dot material used in the blue light quantum dot unit, that is, the blue light quantum dot material includes one or more of the following composite materials: CdSe, ZnS, ZnSe, ZnT, polymer quantum dots, carbon quantum dots. The visible light converted by the blue light quantum dot unit 1103 includes blue light with a peak wavelength of 430nm-460nm.

[0073] For example, the blue light quantum dot material includes carbon quantum dots, and the visible light converted by the blue light quantum dot material includes blue light with a peak wavelength of 440nm-450nm.

[0074] Embodiment 2: Each quantum dot unit covers a pixel unit in the up and down direction, and the color of the visible light converted by each quantum dot unit is the same. In this embodiment, the number of quantum dot units of the ultraviolet light conversion layer 110 is equal to the number of pixel units of the light emitting layer 105 .

[0075] In some embodiments, the color of the visible light converted by each quantum dot unit is the same as the color of the visible light emitted by a sub-pixel unit in the pixel unit covered by each quantum dot unit. For example, the visible light converted by each quantum dot unit is blue light. That is, all quantum dot units are set as blue light quantum dot units.

[0076] For example, Figure 2 As shown, the ultraviolet conversion layer 110 includes a blue light quantum dot unit 1103 , and the blue light quantum dot unit 1103 covers the red light sub-pixel unit 1051 , the green light sub-pixel unit 1052 and the blue light sub-pixel unit 1053 along the up and down directions respectively.

[0077] like Figure 4 As shown, when external ultraviolet light A enters the ultraviolet light conversion layer 110, the blue light quantum dot unit 1103 is excited to convert the external ultraviolet light A into blue light, a part of the blue light B is emitted downward, and another part of the blue light C is emitted upward from the ultraviolet light conversion layer 110.

[0078] In this way, the ultraviolet light in the layer below the ultraviolet light conversion layer 110 in the display panel 100 can be reduced. Under the premise of ensuring the luminous requirements of the display panel 100, the anti-ultraviolet ability of the display panel 100 can be greatly improved, and the adverse effects of external ultraviolet rays on the internal materials of the devices of the display panel 100 are reduced, thereby improving the anti-aging ability of the display panel 100, extending the service life of the display panel 100, and making the display panel 100 have the characteristics of high color purity. In addition, a part of the blue light B emitted downward can improve the device life problem caused by the short life of the blue light-emitting material. Another part of the blue light C emitted upward improves the light extraction efficiency of the display panel 100, so that the display panel 100 has the characteristics of low power consumption.

[0079] In some embodiments, in Embodiment 2, the color cast of the display panel 100 can be avoided by adjusting the wavelength of the light emitted by the red sub-pixel unit and the wavelength of the light emitted by the green sub-pixel unit in the light-emitting layer 105 .

[0080] In one example, the ultraviolet conversion layer 110 includes a substrate, and the surface of the substrate facing away from the light-emitting layer 105 includes a plurality of grooves, and the plurality of grooves are spaced apart along the arrangement direction of the plurality of pixel units, and each groove is used for a quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit.

[0081] like Figure 2 As shown, the ultraviolet conversion layer 110 includes a substrate 109, and the surface of the substrate 109 facing away from the light-emitting layer 105 includes a plurality of grooves G, and the plurality of grooves G are arranged at intervals along the front-to-back direction. Each groove G is used to fill the blue light quantum dot material to form a blue light quantum dot unit 1103. The depth of each groove G along the up-down direction is less than the thickness of the substrate 109.

[0082] In another example, the ultraviolet conversion layer 110 is a cover plate of the display panel 100, and the surface of the cover plate facing away from the light-emitting layer 105 includes a plurality of grooves, and the plurality of grooves are arranged at intervals along the arrangement direction of the plurality of pixel units, and each groove is used for a quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit. The depth of each groove along the up and down direction is less than the thickness of the cover plate.

[0083] In some embodiments, such as Figure 1 and Figure 2 As shown, the display panel 100 further includes a plurality of first electrodes 103 and a second electrode 106, and the polarities of the first electrodes 103 and the second electrodes 106 are opposite. Each first electrode 103 surrounds a sub-pixel unit, and the second electrode 106 is disposed between the light-emitting layer 105 and the encapsulation layer 107. The number of the first electrodes 103 is equal to the number of the sub-pixel units of the light-emitting layer 105. In this embodiment, the plurality of first electrodes 103 and the light-emitting layer 105 are collectively referred to as a pixel definition layer 104.

[0084] In some embodiments, such as Figure 5 As shown, the display panel 100 further includes a first electrode 103, a second electrode 106, a hole injection layer 301, a hole transport layer 302, an electron transport layer 303 and an electron injection layer 304. In the up and down direction, the second electrode 106, the electron injection layer 304, the electron transport layer 303, the light emitting layer 105, the hole transport layer 302, the hole injection layer 301, and the first electrode 103 are sequentially arranged. In addition, the first electrode 103 is close to the substrate 102, and the second electrode 106 is close to the encapsulation layer 107.

[0085] In some embodiments, such as Figure 1 and Figure 2 As shown, the display panel 100 further includes a color filter layer 108 , which is disposed on a side of the encapsulation layer 107 away from the light emitting layer 105 .

[0086] The color filter layer 108 includes a plurality of filter units, each of which covers a sub-pixel unit in the up and down directions, and the color corresponding to each filter unit is the same as the color of the visible light emitted by the sub-pixel unit covered by each filter unit.

[0087] For example, Figure 1 and Figure 2 As shown, the color filter layer 108 includes a red light filter unit 1081, a green light filter unit 1082 and a blue light filter unit 1083. The red light filter unit 1081 covers the red light sub-pixel unit 1051 in the up-down direction, the green light filter unit 1082 covers the green light sub-pixel unit 1052 in the up-down direction, and the blue light filter unit 1083 covers the blue light sub-pixel unit 1053 in the up-down direction.

[0088] In the above embodiment 1, Figure 3 As shown, a portion of the red light B1, a portion of the green light B2 and a portion of the blue light B3 emitted downward by the ultraviolet light conversion layer 110 enter the color filter layer 108, which can reduce the risk of photolysis, photooxidation-reduction or photoaging of the organic material in the color filter layer 108 due to long-term exposure to external ultraviolet rays.

[0089] In the above embodiment 2, if Figure 4 As shown, a portion of the blue light B emitted downward by the ultraviolet light conversion layer 110 enters the color filter layer 108, which can reduce the risk of photolysis, photooxidation and reduction or photoaging of the organic material in the color filter layer 108 due to long-term exposure to external ultraviolet rays.

[0090] like Figure 1 and Figure 2 As shown, a black matrix 1084 is disposed between two adjacent filter units, and the black matrix 1084 is a truncated cone-shaped matrix. In some embodiments, the cross-section of the black matrix 1084 along the vertical direction is inverted trapezoidal. Exemplarily, the material used for the black matrix 1084 is a black polyimide material.

[0091] In some embodiments, such as Figure 1 and Figure 2 As shown, the display panel 100 further includes a planarization layer, which is disposed on a side of the ultraviolet conversion layer 110 away from the light emitting layer 105. The planarization layer can compensate for the thickness difference of the ultraviolet conversion layer 110, so that the display panel 100 is easy to package.

[0092] It should be noted that the encapsulation layer 107 may be a rigid encapsulation or a flexible encapsulation, which may be selected according to the use requirements of the display panel 100 .

[0093] The embodiment of the present application also provides a method for preparing the display panel 100 . Figure 6 A method 200 for preparing a display panel 100 is provided in an embodiment of the present application.

[0094] like Figure 6 As shown, the preparation method 200 includes S210 to S230. S210 to S230 are described in detail below.

[0095] It should be noted that the various layer structures of the display panel 100 are not described in detail below, and the details can be referred to the above related description.

[0096] S210, providing a substrate.

[0097] In the embodiment where the base includes the base plate 101 and the substrate 102 , the substrate 102 is disposed on the base plate 101 to obtain the base plate.

[0098] S220, forming a light-emitting layer 105 on the substrate.

[0099] In the embodiment where the base comprises the substrate 101 and the substrate 102 , S220 comprises: forming the light emitting layer 105 on a side of the substrate 102 away from the substrate 101 by using an evaporation process.

[0100] In the embodiment where the base only includes the substrate 101 , S220 includes: forming the light emitting layer 105 on one side of the substrate 101 by using an evaporation process.

[0101] In the embodiment where the base only includes the substrate 102 , S220 includes: forming the light emitting layer 105 on one side of the substrate 102 by using an evaporation process.

[0102] S230 , forming an encapsulation layer 107 on the light-emitting layer 105 and forming an ultraviolet conversion layer 110 on the encapsulation layer 107 , or forming an ultraviolet conversion layer 110 on the light-emitting layer 105 and forming an encapsulation layer 107 on the ultraviolet conversion layer 110 .

[0103] In Example 1, the preparation of the ultraviolet conversion layer 110 includes: first, providing a substrate 109 or a glass cover plate, and setting an optical functional layer on the surface of the substrate 109 or the glass cover plate away from the light-emitting layer 105. Secondly, on the surface of the optical functional layer away from the substrate 109, a plurality of grooves are etched in the up and down directions at positions corresponding to the plurality of sub-pixel units. Finally, each groove is filled with a quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit.

[0104] In Example 2, the preparation of the ultraviolet conversion layer 110 includes: first, providing a substrate 109 or a glass cover plate; and setting an optical functional layer on the surface of the substrate 109 or the glass cover plate away from the light-emitting layer 105. Secondly, on the surface of the optical functional layer away from the substrate 109, a plurality of grooves are etched in the up-down direction at positions corresponding to a plurality of pixel units. Finally, each groove is filled with a quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit.

[0105] Exemplarily, the material used for the substrate 109 includes but is not limited to inorganic materials or organic materials such as silicon nitride and silicon oxide.

[0106] In either embodiment 1 or embodiment 2, the ultraviolet conversion layer 110 is manufactured on the glass cover plate of the display panel 100 itself, which does not increase the thickness of the display panel 100 and reduces the manufacturing cost of the display panel 100 .

[0107] In either embodiment 1 or embodiment 2, using a separate substrate to manufacture the ultraviolet conversion layer 110 will not destroy the original structure of the display panel 100 and will not affect other properties of the display panel 100.

[0108] Exemplarily, a plurality of grooves are etched using photolithography. In addition, the quantum dot unit can be in the form of a quantum dot film, which can be prepared into each quantum dot film by solution processing methods such as spin coating, printing, and printing under non-vacuum conditions. The preferred printing method is inkjet printing (Ink Jet Printing, IJP).

[0109] In some embodiments, filling each groove with a quantum dot material having the same color as the visible light converted by each quantum dot unit to form each quantum dot unit includes: filling each groove with a blue quantum dot material to form each quantum dot unit.

[0110] In some embodiments, the preparation method 200 further includes: manufacturing a planarization layer on the ultraviolet conversion layer 110 .

[0111] In some embodiments, the preparation method 200 further includes: manufacturing a color filter layer 108 on the encapsulation layer 107 .

[0112] Specifically, making the color filter layer 108 on the encapsulation layer 107 includes: forming a plurality of black matrices 1084 by an etching process on a side of the encapsulation layer 107 away from the substrate and at a position corresponding to the interval between any two adjacent sub-pixel units along the up and down directions; and forming a plurality of filter units between any two adjacent black matrices 1084 by evaporation or deposition of transparent color film technology.

[0113] In the embodiment where the display panel 100 includes the first electrode 103 and the second electrode 106, the preparation method 200 further includes: first, on the side of the substrate 102 away from the base plate 101, a pixel definition layer 104 is formed by coating and photo process, and the first electrode 103 is formed by etching process. Secondly, a light emitting layer 105 and a second electrode 106 are sequentially formed on the side of the first electrode 103 away from the substrate 102 by evaporation process. Then, an encapsulation layer 107 is disposed on the side of the second electrode 106 away from the substrate 102.

[0114] It should be understood that the preparation method 200 does not describe in detail the structure of each layer of the display panel 100 , and the details may refer to the specific structure of the display panel 100 described above.

[0115] The present application also provides a display device, including the display panel 100 described in any of the above embodiments. The display device is, for example, any device with a display function, such as a display, a mobile phone, a tablet computer, a billboard, etc.

[0116] In the embodiments of the present application, the size of the serial numbers of each step does not mean the order of execution. The order of execution of each step should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0117] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0118] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A display panel, characterized in that: include: A substrate, a light-emitting layer and an encapsulation layer are stacked in sequence, wherein the light-emitting layer includes a plurality of pixel units, each of the pixel units includes a plurality of sub-pixel units, and each of the sub-pixel units is used to emit visible light of one color; The ultraviolet conversion layer is arranged between the encapsulation layer and the light-emitting layer or on the side of the encapsulation layer away from the light-emitting layer. The ultraviolet conversion layer includes a plurality of quantum dot units, each of which covers at least one sub-pixel unit, and each of which is used to convert incident ultraviolet light into visible light and emit it.

2. The display panel according to claim 1, characterized in that: Each of the quantum dot units covers one of the sub-pixel units, and the color of the visible light converted by each of the quantum dot units is the same as the color of the visible light emitted by one of the sub-pixel units covered by each of the quantum dot units.

3. The display panel according to claim 2, characterized in that: The surface of the ultraviolet conversion layer facing away from the light-emitting layer includes a plurality of groups of grooves, and the plurality of groups of grooves are arranged at intervals along the arrangement direction of the plurality of pixel units. Each group of grooves includes a plurality of grooves, and the plurality of grooves are arranged at intervals along the arrangement direction of the plurality of sub-pixel units of one pixel unit. Each of the grooves is used to fill a quantum dot material corresponding to the color of the visible light converted by each quantum dot unit to form each quantum dot unit.

4. The display panel according to claim 1, characterized in that: Each of the quantum dot units covers one of the pixel units, and the color of the visible light converted by each of the quantum dot units is the same.

5. The display panel according to claim 4, characterized in that: The color of the visible light converted by each quantum dot unit is the same as the color of the visible light emitted by a sub-pixel unit in the pixel unit covered by each quantum dot unit.

6. The display panel according to claim 4 or 5, characterized in that: The visible light converted by each quantum dot unit is blue light.

7. The display panel according to claim 4 or 5, characterized in that: The surface of the ultraviolet conversion layer facing away from the light-emitting layer includes a plurality of grooves, and the plurality of grooves are arranged at intervals along the arrangement direction of the plurality of pixel units, and each of the grooves is used to fill the quantum dot material corresponding to the color of the visible light converted by each of the quantum dot units to form each of the quantum dot units.

8. The display panel according to any one of claims 1 to 7, characterized in that: The display panel further includes: A planarization layer, the planarization layer being disposed on a side of the ultraviolet conversion layer away from the light-emitting layer; A color filter layer, wherein the color filter layer is arranged on a side of the encapsulation layer away from the light-emitting layer, the color filter layer comprises a plurality of filter units, each of the filter units covers one of the sub-pixel units, and the color corresponding to each of the filter units is the same as the color of visible light emitted by the sub-pixel unit covered by each of the filter units.

9. The display panel according to any one of claims 1 to 8, characterized in that: The quantum dot material used in one of the multiple quantum dot units includes one or more of the following composite materials: ZnCl2, ZnO, Zn3As2, Zn3N2, GaCl3, Ga2O3, GaAs, GaN, MgCl2, MgO, Mg3As2, Mg3N2, PbCl2, PbO, Pb3As2, Pb3N2, and the visible light converted by the one quantum dot unit includes red light with a peak wavelength of 620nm-750nm; The quantum dot material used by another quantum dot unit among the multiple quantum dot units includes one or more of the following composite materials: Na3P, Na3As, Na3As, Na2S, Fe3P, Fe2As, FeSb, FeSb2, Fe2S3, InP, InAs, InSb, In2S3, PbP, PbAs, PbSb, Pb2S3, Mn3P2, MnAs, Mn2Sb, MnS, Cs3P, Cs3As, Cs3Sb, Cs2S, and the visible light converted by the other quantum dot unit includes green light with a peak wavelength of 500nm-580nm; The quantum dot material used in another quantum dot unit among the multiple quantum dot units includes one or more of the following composite materials: CdSe, ZnS, ZnSe, ZnT, polymer quantum dots, carbon quantum dots, and the visible light converted by the another quantum dot unit includes blue light with a peak wavelength of 430nm-460nm.

10. A method for preparing a display panel, characterized in that: The preparation method comprises: providing a substrate; A light-emitting layer is fabricated on the substrate, wherein the light-emitting layer comprises a plurality of pixel units, each of the pixel units comprises a plurality of sub-pixel units, and each of the sub-pixel units is used to emit visible light of one color; An encapsulation layer is made on the light-emitting layer and an ultraviolet conversion layer is made on the encapsulation layer, or an ultraviolet conversion layer is made on the light-emitting layer and an encapsulation layer is made on the ultraviolet conversion layer, wherein the ultraviolet conversion layer includes a plurality of quantum dot units, each of the quantum dot units covers at least one of the sub-pixel units, and each of the quantum dot units is used to convert incident ultraviolet light into visible light and emit it.

11. The preparation method according to claim 10, characterized in that: The preparation of the ultraviolet conversion layer comprises: providing a substrate or a glass cover; Disposing an optical functional layer on a surface of the substrate or the glass cover plate away from the light-emitting layer; Etching a plurality of grooves at positions corresponding to the plurality of sub-pixel units on a surface of the optical functional layer away from the substrate; A quantum dot material corresponding to the color of the visible light converted by each quantum dot unit is filled in each of the grooves to form each of the quantum dot units, and the color of the visible light converted by each of the quantum dot units is the same as the color of the visible light emitted by a sub-pixel unit covered by each of the quantum dot units.

12. The preparation method according to claim 10, characterized in that: The preparation of the ultraviolet conversion layer comprises: providing a substrate or a glass cover; Disposing an optical functional layer on a surface of the substrate or the glass cover plate away from the light-emitting layer; Etching a plurality of grooves at positions corresponding to the plurality of pixel units on a surface of the optical functional layer away from the substrate; Each of the grooves is filled with a quantum dot material corresponding to the color of the visible light converted by each of the quantum dot units to form each of the quantum dot units, and the color of the visible light converted by each of the quantum dot units is the same.

13. The preparation method according to claim 12, characterized in that: The step of filling each of the grooves with a quantum dot material corresponding to the color of the visible light converted by each of the quantum dot units to form each of the quantum dot units comprises: Each of the grooves is filled with a blue quantum dot material to form each of the quantum dot units.

14. The preparation method according to any one of claims 10 to 13, characterized in that: The preparation method further comprises: forming a planarization layer on the ultraviolet conversion layer; A color filter layer is made on the encapsulation layer, the color filter layer includes a plurality of filter units, each of the filter units covers one of the sub-pixel units, and the color corresponding to each of the filter units is the same as the color of visible light emitted by the sub-pixel unit covered by each of the filter units.

15. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 9.

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