Display panel

Abstract

The utility model relates to a display panel. According to the utility model, the up-conversion light-emitting layer is arranged on one side, far away from the substrate, of the pixel definition layer between at least two adjacent light-emitting units; the upper conversion light-emitting layer converts part of emergent light rays of the first light-emitting unit and / or part of emergent light rays of the second light-emitting unit into light rays with the same color as the emergent light rays of the third light-emitting unit, and on the basis that the brightness and efficiency of the display panel are not reduced, the light rays of the first light-emitting unit and / or the emergent light rays of the second light-emitting unit are converted into light rays with the same color as the emergent light rays of the third light-emitting unit. The color cast phenomenon caused by different brightness attenuation speeds of light emitted by the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is improved, and the brightness of the third light-emitting unit is improved.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display panel. Background Art

[0002] Organic Light Emitting Diode (OLED for short), whose full English name is Organic Light Emitting Diode, is an optoelectronic technology that uses organic semiconductor materials to produce reversible color changes under current drive to achieve colorful displays. OLED has the advantages of being thin, light, high brightness, active light emission, low energy consumption, large viewing angle, fast response, flexibility, wide operating temperature range, low voltage requirement, high power saving efficiency, fast reaction, simple structure, low cost, and almost infinitely high contrast, and is considered to be the most promising new generation of display technology.

[0003] When viewing the current OLED display panel under large viewing angle conditions, the color of the displayed image seen by the user turns red or blueish, resulting in impure white light color under large viewing angles. The main reason is that as the viewing angle changes, the brightness attenuation speed (L-decay) of the light emitted by the red, green, and blue three pixels of the RGB three primary colors is different. The brightness of the light emitted by the red and green pixels attenuates more slowly than that of the blue pixel as the viewing angle increases, and the proportion of red light and green light in the white light ratio is relatively large, which causes the synthesized white light to turn red or blueish under large viewing angles.

[0004] Currently, the problem can be solved by setting a blue color film layer or a film layer with blue quantum dots on the pixel definition layer (PDL) to absorb red and green light in large-angle directions, making the brightness attenuation speeds of the red, green, and blue three colors similar, thereby solving the problem of redness and blueness when viewing at large angles and improving the display effect. However, this method of absorbing red and green light will lead to a decrease in brightness and efficiency, and it is not the optimal solution. Summary of the Utility Model

[0005] The purpose of this utility model is to provide a display panel that can solve the problems such as the decrease in brightness and efficiency caused by the method of absorbing red and green light to solve the problem of redness and blueness when viewing at large angles in the prior art.

[0006] To solve the above problems, the present utility model provides a display panel, which includes: a substrate; a plurality of first electrodes, arranged on the substrate at intervals; a pixel definition layer, arranged on the substrate between any two adjacent first electrodes, and the pixel definition layer is provided with a plurality of pixel openings corresponding to the first electrodes one by one; a plurality of light-emitting units, arranged on the first electrodes in the pixel openings one by one; the light-emitting units include a first light-emitting unit, a second light-emitting unit and a third light-emitting unit; an upconversion light-emitting layer, arranged on the side of the pixel definition layer away from the substrate between at least two adjacent light-emitting units, and the orthographic projection of the upconversion light-emitting layer on the substrate is located within the orthographic projection of the pixel definition layer on the substrate; wherein, the upconversion light-emitting layer converts part of the emitted light of the first light-emitting unit and / or part of the emitted light of the second light-emitting unit into light having the same color as the emitted light of the third light-emitting unit.

[0007] Further, the first light-emitting unit, the second light-emitting unit and the third light-emitting unit are a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit respectively; wherein, the upconversion light-emitting layer converts part of the red light of the red light-emitting unit and / or part of the green light of the green light-emitting unit into blue light.

[0008] Further, the conversion factor of the upconversion light-emitting layer is a, the thickness of the upconversion light-emitting layer is b, and the conversion efficiency of the upconversion light-emitting layer for the emitted light of the first light-emitting unit and / or the emitted light of the second light-emitting unit is a*b.

[0009] Further, the conversion efficiency of the upconversion light-emitting layer for the emitted light of the red light-emitting unit and / or the emitted light of the green light-emitting unit is less than or equal to 50%.

[0010] Further, the thickness of the upconversion light-emitting layer is less than 100 nm.

[0011] Further, between any two adjacent light-emitting units, the width of the upconversion light-emitting layer is less than the width of the surface of the pixel definition layer away from the substrate.

[0012] Further, the surface of the upconversion light-emitting layer close to the substrate is flush with the surface of the pixel definition layer away from the substrate.

[0013] Further, the display panel further includes: a second electrode disposed on the light-emitting unit and on the pixel definition layer; a first encapsulation layer disposed on a side of the second electrode away from the substrate; and a cover plate disposed on a side of the first encapsulation layer away from the substrate; wherein, a surface of the up-conversion light-emitting layer close to the substrate is flush with a surface of the first encapsulation layer away from the substrate; and / or a surface of the up-conversion light-emitting layer away from the substrate is flush with a surface of the cover plate close to the substrate.

[0014] Further, the material of the up-conversion light-emitting layer includes: one of an Er3+ / Tm3+-MOFs fluorescent material with blue light up-conversion and a chloro-germanate up-conversion light-emitting material.

[0015] Further, the matrix of the Er3+ / Tm3+-MOFs fluorescent material with blue light up-conversion includes one of sodium fluoride and sodium acetate, and the doping element of the Er3+ / Tm3+-MOFs fluorescent material with blue light up-conversion includes one of Y3+, Yb3+, and Tm3+; the chemical formula of the chloro-germanate up-conversion light-emitting material is R2GeCl6:xHo3+, where R is at least one of lithium element, sodium element, potassium element, rubidium element, and cesium element, and x is 0.002 - 0.08.

[0016] The advantages of the present utility model are as follows: The present utility model provides an up-conversion light-emitting layer on a side of the pixel definition layer away from the substrate between at least two adjacent light-emitting units. The up-conversion light-emitting layer converts part of the emitted light of the first light-emitting unit and / or part of the emitted light of the second light-emitting unit into light having the same color as the emitted light of the third light-emitting unit. By using the up-conversion light-emitting layer, on the basis of not reducing the brightness and efficiency of the display panel, the color shift phenomenon caused by the different attenuation speeds of the light emitted by the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is improved, and the brightness of the third light-emitting unit is enhanced. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of the display panel of Embodiment 1 and Embodiment 2 of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the first semi-finished product of Embodiment 1 and Embodiment 2;

[0020] Figure 3 It is a schematic diagram of printing the up-conversion luminescent material on the cover plate in Embodiment 1;

[0021] Figure 4 It is a schematic diagram of heating and drying the up-conversion luminescent material on the cover plate in Embodiment 1;

[0022] Figure 5 It is a schematic diagram of the structure after laminating the cover plate and the first semi-finished product in Embodiments 1 and 2;

[0023] Figure 6 It is a schematic diagram of printing the up-conversion luminescent material on the first encapsulation layer in Embodiment 2;

[0024] Figure 7 It is a schematic diagram of heating and drying the up-conversion luminescent material on the first encapsulation layer in Embodiment 1;

[0025] Figure 8 It is a schematic diagram of the structure of the display panel according to Embodiment 3 of the present utility model.

[0026] Explanation of reference numerals:

[0027] 100, display panel;

[0028] 1, substrate; 2, thin film transistor layer;

[0029] 3, first electrode; 4, pixel definition layer;

[0030] 5, first functional layer; 6, light-emitting unit;

[0031] 7, second functional layer; 8, second electrode;

[0032] 9, first encapsulation layer; 10, cover plate;

[0033] 11, second encapsulation layer; 12, up-conversion luminescent layer;

[0034] 41, pixel opening; 121, up-conversion luminescent material. Detailed description of the specific implementation

[0035] The following will describe in detail the preferred embodiments of the present utility model with reference to the accompanying drawings of the specification, so as to fully introduce the technical content of the present utility model to those skilled in the art, to prove by way of example that the present utility model can be implemented, to make the technical content disclosed by the present utility model clearer, and to make it easier for those skilled in the art to understand how to implement the present utility model. However, the present utility model can be embodied in many different forms of embodiments, and the protection scope of the present utility model is not limited to the embodiments mentioned in the text. The description of the following embodiments is not intended to limit the scope of the present utility model.

[0036] The directional terms mentioned in the present utility model, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side surface", etc., are only the directions in the attached drawings. The directional terms used in this text are used to explain and illustrate the present utility model, rather than to limit the protection scope of the present utility model.

[0037] In the attached drawings, components with the same structure are denoted by the same numerical reference signs, and components with similar structures or functions everywhere are denoted by similar numerical reference signs. In addition, for the convenience of understanding and description, the dimensions and thicknesses of each component shown in the attached drawings are arbitrarily shown, and the present utility model does not limit the dimensions and thicknesses of each component.

[0038] Embodiment 1

[0039] As Figure 1 shown, this embodiment provides a display panel 100. The display panel 100 includes: a substrate 1, a thin film transistor layer 2, a plurality of first electrodes 3, a pixel definition layer 4, a first functional layer 5, a plurality of light emitting units 6, a second functional layer 7, a second electrode 8, a first encapsulation layer 9, a cover plate 10, a second encapsulation layer 11, and an upconversion light emitting layer 12.

[0040] Among them, the material of the substrate 1 is one or more of glass, polyimide, polycarbonate, polyethylene terephthalate, and polyethylene naphthalate. In this embodiment, the material of the substrate 1 is glass.

[0041] Among them, the thin film transistor layer 2 is disposed on the substrate 1. Specifically, the thin film transistor layer 2 includes: an active layer (not shown in the figure), a source electrode (not shown in the figure), a drain electrode (not shown in the figure), and a gate electrode (not shown in the figure), etc.

[0042] Among them, the plurality of first electrodes 3 are arranged at intervals on the surface of the thin film transistor layer 2 on the side away from the substrate 1. The material of the first electrode 3 can be metal. In this embodiment, the material of the first electrode 3 is silver (Ag), whereby the first electrode 3 has good electrical conductivity.

[0043] Among them, the pixel definition layer 4 is disposed on the surface of the thin film transistor layer 2 on the side away from the substrate 1 between any two adjacent first electrodes 3. The pixel definition layer 4 is provided with a plurality of pixel openings 41 corresponding to the first electrodes 3 one by one.

[0044] Among them, the first functional layer 5 is disposed on the first electrode 3 and the pixel definition layer 4. Specifically, the first functional layer 5 includes a hole injection layer (HIL) (not shown in the figure) and a hole transport layer (HTL) (not shown in the figure) which are stacked. The hole transport layer is disposed on a side of the hole injection layer away from the substrate 1. Both the hole injection layer and the hole transport layer can be composed of inorganic or organic materials, including but not limited to various simple substances, compounds, and their composite or hybrid materials, such as organic small molecules, polymers, halogen compounds, chalcogen compounds, nitrogen group compounds, carbon group compounds, or composite or hybrid materials composed of the above materials, etc.

[0045] Among them, a plurality of light-emitting units (EML) 6 are respectively disposed on a surface of the first functional layer 5 on a side away from the substrate 1 within the pixel opening 41. The light-emitting unit 6 includes a first light-emitting unit 61, a second light-emitting unit 62, and a third light-emitting unit 63. In this embodiment, the first light-emitting unit 61, the second light-emitting unit 62, and the third light-emitting unit 63 are a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit respectively. The wavelength range of the emitted light of the red light-emitting unit is 622 nm - 760 nm, the wavelength range of the emitted light of the green light-emitting unit is 492 nm - 577 nm, and the wavelength range of the emitted light of the blue light-emitting unit is 435 nm - 450 nm.

[0046] Among them, the second functional layer 7 is disposed on the light-emitting unit and the first functional layer 5. Specifically, the second functional layer 7 includes an electron injection layer (EIL) (not shown in the figure) and an electron transport layer (ETL) (not shown in the figure) which are stacked. The electron transport layer is disposed on a side of the electron injection layer close to the substrate 1.

[0047] Among them, the second electrode 8 is disposed on a surface of the second functional layer 7 on a side away from the substrate 1. In this embodiment, the material of the second electrode 8 is ITO.

[0048] Among them, the first encapsulation layer 9 is disposed on a side of the second electrode 8 away from the substrate 1. Specifically, the first encapsulation layer 9 includes a first inorganic encapsulation layer (not shown in the figure), an organic encapsulation layer (not shown in the figure), and a second inorganic encapsulation layer (not shown in the figure) which are stacked. Among them, the first inorganic encapsulation layer and the second inorganic encapsulation layer are mainly used to prevent the intrusion of water and oxygen, and the organic encapsulation layer is mainly used to buffer the stress received by the display panel 100.

[0049] Among them, the cover plate 10 is disposed on a side of the first encapsulation layer 9 away from the substrate 1. In this embodiment, the material of the cover plate 10 is glass, so that the cover plate 10 can better protect the film layers thereunder.

[0050] Among them, the second encapsulation layer 11 is disposed between the substrate 1 and the cover plate 10 and extends to cover the side surface of the cover plate 10, for protecting the film layer between the cover plate 10 and the substrate 1.

[0051] Among them, the up-conversion light-emitting layer 12 is disposed on the side of the pixel definition layer 4 away from the substrate 1 between at least two adjacent light-emitting units 6. Among them, the orthographic projection of the up-conversion light-emitting layer 12 on the substrate 1 is located within the orthographic projection of the pixel definition layer 4 on the substrate 1. Specifically, between any two adjacent light-emitting units 6, the width L of the up-conversion light-emitting layer 12 1 is smaller than the width L of the surface of the pixel definition layer 4 on the side away from the substrate 1. 2 Thus, it is possible to prevent the up-conversion light-emitting layer 12 from covering the light-emitting unit 6, thereby avoiding affecting the normal display of the light-emitting unit 6.

[0052] Among them, the up-conversion light-emitting layer 12 converts part of the emitted light of the first light-emitting unit 61 and / or part of the emitted light of the second light-emitting unit 62 into light having the same color as the emitted light of the third light-emitting unit 63. By using the up-conversion light-emitting layer 12, without reducing the brightness and efficiency of the display panel 100, the color shift phenomenon caused by the different attenuation speeds of the light emitted by the first light-emitting unit 61, the second light-emitting unit 62, and the third light-emitting unit 63 is improved, and the brightness of the third light-emitting unit 63 is enhanced.

[0053] In this embodiment, the first light-emitting unit 61, the second light-emitting unit 62, and the third light-emitting unit 63 are a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit respectively. The up-conversion light-emitting layer 12 converts part of the red light A of the red light-emitting unit and / or part of the green light B of the green light-emitting unit into blue light C. The light C of the blue light-emitting unit can directly pass through the up-conversion light-emitting layer 12. By using the up-conversion light-emitting layer 12, without reducing the brightness and efficiency of the display panel 100, the color shift phenomena such as redness or blueness caused by the different attenuation speeds of the light emitted by the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit are improved, and the brightness of the blue light-emitting unit is enhanced.

[0054] Among them, the conversion factor of the upconversion light-emitting layer 12 is a, the thickness of the upconversion light-emitting layer 12 is b, and the conversion efficiency of the upconversion light-emitting layer 12 for the emitted light of the first light-emitting unit 61 and / or the emitted light of the second light-emitting unit 62 is a*b. Among them, the conversion efficiency of the upconversion light-emitting layer 12 for the emitted light of the red light-emitting unit and / or the emitted light of the green light-emitting unit is less than or equal to 50%. In this embodiment, the conversion efficiency of the upconversion light-emitting layer 12 for the emitted light of the red light-emitting unit and / or the emitted light of the green light-emitting unit is 50%. That is, the upconversion light-emitting layer 12 converts 50% of the red light of the red light-emitting unit and / or 50% of the green light of the green light-emitting unit into blue light, thereby not only improving the color deviation phenomenon but also ensuring that the brightness and efficiency of the display panel 100 are not reduced.

[0055] Since the conversion efficiency of the upconversion light-emitting layer 12 for the emitted light of the first light-emitting unit 61 and / or the emitted light of the second light-emitting unit 62 is a*b, the thickness of the upconversion light-emitting layer 12 is determined by its conversion efficiency. In this embodiment, the thickness of the upconversion light-emitting layer is less than 100 nm, thereby avoiding the too thick thickness of the upconversion light-emitting layer from affecting the thickness of the entire display panel and being not conducive to realizing thin and light.

[0056] Among them, the material of the upconversion light-emitting layer 12 includes: one of Er3+ / Tm3+-MOFs fluorescent materials with blue light upconversion and chloro-germanate upconversion light-emitting materials. In this embodiment, the material of the upconversion light-emitting layer 12 is chloro-germanate upconversion light-emitting material.

[0057] Among them, the matrix of the Er3+ / Tm3+-MOFs fluorescent material with blue light upconversion includes one of sodium fluoride and sodium acetate, and the doping elements of the Er3+ / Tm3+-MOFs fluorescent material with blue light upconversion include one of Y3+, Yb3+, and Tm3+.

[0058] Among them, the chemical formula of the chloro-germanate upconversion light-emitting material is R2GeCl6:xHo3+, where R is at least one of lithium element, sodium element, potassium element, rubidium element, and cesium element, and x is 0.002-0.08.

[0059] In this embodiment, the surface of the upconversion light-emitting layer 12 on the side away from the substrate 1 is flush with the surface of the cover plate 10 on the side close to the substrate 1. That is, the upconversion light-emitting layer 12 is disposed on the cover plate 10.

[0060] In this embodiment, since only the upconversion light-emitting layer 12 is provided between the first encapsulation layer 9 and the cover plate 10, and no other film layers are provided, in this embodiment, the surface of the upconversion light-emitting layer 12 on the side close to the substrate 1 is flush with the surface of the first encapsulation layer 9 on the side away from the substrate 1. In other embodiments, not only the upconversion light-emitting layer 12 is provided between the first encapsulation layer 9 and the cover plate 10, but also other film layers are provided. At this time, the surface of the upconversion light-emitting layer 12 on the side away from the substrate 1 is flush with the surface of the cover plate 10 on the side close to the substrate 1, and the surface of the upconversion light-emitting layer 12 on the side close to the substrate 1 is not flush with the surface of the first encapsulation layer 9 on the side away from the substrate 1.

[0061] This embodiment also provides a method for manufacturing the display panel of this embodiment, which includes the following steps.

[0062] As Figure 2 shown, S1: Prepare a thin-film transistor layer 2, a first electrode 3, a pixel definition layer 4, a first functional layer 5, a light-emitting unit 6, a second functional layer 7, a second electrode 8, and a first encapsulation layer 9 on the substrate 1 to form a first semi-finished product.

[0063] As Figure 3 shown, S2: Print the upconversion light-emitting material 121 on a cover plate 10.

[0064] As Figure 4 shown, S3: Heat and dry the upconversion light-emitting material 121 on the cover plate 10 to form the upconversion light-emitting layer 12.

[0065] As Figure 5 shown, S4: Align and bond the cover plate 10 with the upconversion light-emitting layer 12 to the first semi-finished product.

[0066] As Figure 1 shown, S5: Prepare a second encapsulation layer 11 between the substrate 1 and the cover plate 10 and on the side surface of the cover plate 10.

[0067] Embodiment 2

[0068] As Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 5 shown, this embodiment includes most of the technical features of Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the surface of the upconversion light-emitting layer 12 on the side close to the substrate 1 is flush with the surface of the first encapsulation layer 9 on the side away from the substrate 1. That is, the upconversion light-emitting layer 12 is disposed on the first encapsulation layer 9.

[0069] In this embodiment, since only the up-conversion light-emitting layer 12 is provided between the first encapsulation layer 9 and the cover plate 10, and no other film layers are provided, the surface of the up-conversion light-emitting layer 12 on the side away from the substrate 1 is flush with the surface of the cover plate 10 on the side close to the substrate 1. In other embodiments, not only the up-conversion light-emitting layer 12 is provided between the first encapsulation layer 9 and the cover plate 10, but also other film layers are provided. At this time, the surface of the up-conversion light-emitting layer 12 on the side close to the substrate 1 is flush with the surface of the first encapsulation layer 9 on the side away from the substrate 1, and the surface of the up-conversion light-emitting layer 12 on the side away from the substrate 1 is not flush with the surface of the cover plate 10 on the side close to the substrate 1.

[0070] This embodiment also provides a method for manufacturing the display panel of this embodiment, which includes the following steps.

[0071] As Figure 2 shown, S1: Prepare a thin-film transistor layer 2, a first electrode 3, a pixel definition layer 4, a first functional layer 5, a light-emitting unit 6, a second functional layer 7, a second electrode 8, and a first encapsulation layer 9 on the substrate 1 to form a first semi-finished product.

[0072] As Figure 6 shown, S2: Print the up-conversion light-emitting material 121 on the surface of the first encapsulation layer 9 away from the substrate 1.

[0073] As Figure 7 shown, S3: Heat and dry the up-conversion light-emitting material 121 on the first encapsulation layer 9 to form the up-conversion light-emitting layer 12.

[0074] As Figure 5 shown, S4: Align and bond the cover plate 10 with the first semi-finished product with the up-conversion light-emitting layer 12.

[0075] As Figure 1 shown, S5: Prepare a second encapsulation layer 11 between the substrate 1 and the cover plate 10 and on the side surface of the cover plate 10.

[0076] Embodiment 3

[0077] As Figure 8 shown, this embodiment includes most of the technical features of Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the surface of the up-conversion light-emitting layer 12 on the side close to the substrate 1 is flush with the surface of the pixel definition layer 4 on the side away from the substrate 1. That is, in this embodiment, the up-conversion light-emitting layer 12 is directly provided on the pixel definition layer 4.

[0078] The above has introduced in detail a display panel provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A display panel, characterized in that: include: base(1); A plurality of first electrodes (3) are arranged on the substrate (1) at intervals from each other; A pixel definition layer (4) is arranged on the substrate (1) between any two adjacent first electrodes (3), and the pixel definition layer (4) is provided with a plurality of pixel openings (41) corresponding one-to-one to the first electrodes (3); A plurality of light-emitting units (6) are arranged one by one on the first electrode (3) in the pixel opening (41); the light-emitting units (6) include a first light-emitting unit (61), a second light-emitting unit (62) and a third light-emitting unit (63); An upconversion luminescent layer (12) is arranged on a side of the pixel definition layer (4) away from the substrate (1) between at least two adjacent luminescent units (6), wherein an orthographic projection of the upconversion luminescent layer (12) on the substrate (1) is located within an orthographic projection of the pixel definition layer (4) on the substrate (1); The up-conversion light-emitting layer (12) converts part of the emitted light of the first light-emitting unit (61) and / or part of the emitted light of the second light-emitting unit (62) into light of the same color as the emitted light of the third light-emitting unit (63).

2. The display panel according to claim 1, characterized in that: The first light-emitting unit (61), the second light-emitting unit (62) and the third light-emitting unit (63) are respectively a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit; The up-conversion light-emitting layer (12) converts part of the red light of the red light-emitting unit and / or part of the green light of the green light-emitting unit into blue light.

3. The display panel according to claim 2, characterized in that: The conversion factor of the up-conversion light-emitting layer (12) is a, the thickness of the up-conversion light-emitting layer (12) is b, and the conversion efficiency of the up-conversion light-emitting layer (12) for the outgoing light of the first light-emitting unit (61) and / or the outgoing light of the second light-emitting unit (62) is a*b.

4. The display panel according to claim 3, characterized in that: The conversion efficiency of the up-conversion luminescent layer (12) for the emitted light of the red luminescent unit and / or the emitted light of the green luminescent unit is less than or equal to 50%.

5. The display panel according to claim 3, characterized in that: The thickness of the up-conversion light-emitting layer (12) is less than 100 nm.

6. The display panel according to claim 1, characterized in that: Between any two adjacent light-emitting units (6), the width of the up-conversion light-emitting layer (12) is smaller than the width of the surface of the pixel definition layer (4) on a side away from the substrate (1).

7. The display panel according to claim 1, characterized in that: The surface of the up-conversion light-emitting layer (12) on the side close to the substrate (1) is flush with the surface of the pixel definition layer (4) on the side away from the substrate (1).

8. The display panel according to claim 1, characterized in that: Also includes: A second electrode (8) is disposed on the light-emitting unit (6) and the pixel definition layer (4); A first encapsulation layer (9) is arranged on a side of the second electrode (8) away from the substrate (1); and A cover plate (10) is arranged on a side of the first packaging layer (9) away from the substrate (1); wherein a surface of the up-conversion light-emitting layer (12) on a side close to the substrate (1) is flush with a surface of the first encapsulation layer (9) on a side away from the substrate (1); and / or The surface of the up-conversion light-emitting layer (12) on a side away from the substrate (1) is flush with the surface of the cover plate (10) on a side close to the substrate (1).

9. The display panel according to claim 1, characterized in that: The material of the up-conversion luminescent layer (12) includes: one of an Er3+ / Tm3+-MOFs fluorescent material with blue light up-conversion and a chlorogermanate up-conversion luminescent material.

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