Display panel, display device and method for manufacturing display panel

Abstract

The present invention discloses a display panel, a display device and a method for manufacturing a display panel, so as to improve the problem of dispersion and rainbow patterns in the rigid organic light-emitting display products of the prior art. The display panel comprises: a substrate and a packaging cover plate arranged opposite to each other, and a light-emitting device sealed between the substrate and the packaging cover plate; the light-emitting device comprises a light-emitting layer and a reflective electrode layer located on the side of the light-emitting layer facing the packaging cover plate, and a gap filled with a first gas is provided between the reflective electrode layer and the packaging cover plate, and the difference between the refractive index of the first gas and the refractive index of the packaging cover plate is greater than a first value; the display panel also comprises: a patterned functional layer arranged on a light propagation path, wherein the light propagation path is a path for the external ambient light to be incident on the reflective electrode layer through the packaging cover plate.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor technology, and in particular to a display panel, a display device and a method for manufacturing the display panel. Background Art

[0002] Flat panel displays (F1at Pane1 Disp1ay, FPD) have become the mainstream product on the market, and there are more and more types of flat panel displays, such as Liquid Crystal Display (Liquid Crystal Display, LCD), Organic Light Emitted Diode (Organic Light Emitted Diode, OLED) display, Plasma Display Panel (P1asma DisplayPane1, PDP) and Field Emission Display (Field Emission Display, FED) and so on.

[0003] However, the rigid organic light-emitting display products in the prior art have the problem of dispersion and rainbow patterns at oblique viewing angles. Summary of the invention

[0004] The present invention provides a display panel, a display device and a method for manufacturing the display panel, so as to improve the problem of color dispersion and rainbow pattern at oblique viewing angles in the rigid organic light-emitting display products of the prior art.

[0005] An embodiment of the present invention provides a display panel, comprising: a base substrate and a packaging cover plate arranged opposite to each other, and a light-emitting device sealed between the base substrate and the packaging cover plate; the light-emitting device comprises a light-emitting layer and a reflective electrode layer located on a side of the light-emitting layer facing the packaging cover plate, a gap filled with a first gas is provided between the reflective electrode layer and the packaging cover plate, and a difference between a refractive index of the first gas and a refractive index of the packaging cover plate is greater than a first value;

[0006] The display panel further includes: a patterned functional layer disposed on a light propagation path, wherein the light propagation path is a path along which ambient light is incident on the reflective electrode layer via the packaging cover plate.

[0007] In a possible implementation, the functional layer is located on a side of the reflective electrode layer facing the package cover plate; or, the functional layer is located on a side of the package cover plate away from the reflective electrode layer; or, the functional layer is located on a side of the package cover plate facing the reflective electrode layer.

[0008] In a possible implementation, the functional layer includes a pattern portion and a hollow portion penetrating the functional layer, wherein a ratio of a total area of ​​the hollow portion to an area of ​​the functional layer is 45% to 55%.

[0009] In a possible implementation manner, the thickness d of the functional layer satisfies the following relationship:

[0010] (n1-n2)*2(d / sin45°)=550*(1 / 2), wherein n1 represents the refractive index of the functional layer, and n2 represents the refractive index of the first gas.

[0011] In a possible implementation, the pattern portion includes a plurality of rectangular first pattern strips extending along the first direction and sequentially arranged along the second direction, the hollow portion includes rectangular first hollow strips extending along the first direction and sequentially arranged along the second direction, and the first pattern strips and the first hollow strips are alternately arranged along the second direction;

[0012] Alternatively, the pattern portion includes a plurality of wavy second pattern strips extending along the first direction and sequentially arranged along the second direction, the hollow portion includes wavy second hollow strips extending along the first direction and sequentially arranged along the second direction, and the second pattern strips and the second hollow strips are alternately arranged along the second direction;

[0013] Alternatively, the pattern portion includes a plurality of first pattern groups extending along the first direction and arranged in sequence along the second direction, the first pattern group includes a plurality of first pattern blocks arranged at intervals along the first direction; the hollow portion includes a first hollow block located between adjacent first pattern blocks in the first pattern group, and the first pattern blocks of adjacent first pattern groups are staggered;

[0014] Alternatively, the pattern portion includes a second pattern group and a third pattern group extending along the second direction, and the second pattern group and the third pattern group are alternately arranged along the first direction; the second pattern group includes a plurality of second pattern blocks spaced from each other; the third pattern group includes a plurality of pattern units connected in sequence along the second direction, and the pattern unit includes two U-shaped openings arranged along the first direction, and in the same pattern unit, the opening directions of the two U-shaped openings are the same, wherein one side of the U-shaped opening intersects with one side of the other U-shaped opening to form an acute angle; the second pattern block is parallel to the first axis of symmetry in the first direction and is located between two adjacent pattern units; the hollow portion is located in an area outside the pattern portion and is complementary to the shape of the pattern portion.

[0015] In a possible implementation, the functional layer includes a substrate and a plurality of array-distributed protrusion combinations located on one side of the substrate, the protrusion combination includes a first sub-protrusion and a second sub-protrusion surrounding the first sub-protrusion; the protrusion combinations in adjacent rows are staggered.

[0016] In a possible implementation manner, an outer contour of the first sub-protrusion is similar in shape to an outer contour of the second sub-protrusion.

[0017] An embodiment of the present invention further provides a display device, comprising the display panel provided by the embodiment of the present invention.

[0018] The embodiment of the present invention further provides a method for manufacturing the display panel provided in the embodiment of the present invention, the manufacturing method comprising:

[0019] A light-emitting layer and a reflective electrode layer are sequentially formed on one side of the base substrate;

[0020] A functional layer having a patterned structure and located on a light propagation path is formed, the base substrate and the packaging cover are sealed, and a gap having a first gas is formed between the reflective electrode layer and the packaging cover, the difference between the refractive index of the first gas and the refractive index of the packaging cover is greater than a first value, and the light propagation path is a path for external ambient light to be incident on the reflective electrode layer through the packaging cover.

[0021] In a possible implementation, the forming of the functional layer located on the light propagation path and having a patterned structure, and the sealing of the substrate and the package cover plate include:

[0022] forming a functional thin film on a side of the reflective electrode layer away from the light-emitting layer;

[0023] The functional film is exposed through a half-tone mask to form a functional layer including a substrate and a plurality of protrusions located on one side of the substrate.

[0024] The beneficial effects of the embodiments of the present invention are as follows: In the embodiments of the present invention, the display panel also includes a patterned functional layer arranged on the light propagation path. The patterned functional layer can destroy the reflected light of the reflective electrode layer, and the equal-inclined interference that occurs after the light is refracted by the first gas and out of the packaging cover plate, thereby improving the rainbow pattern defect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of producing light and dark fringes;

[0026] Figure 2 Schematic diagram of producing rainbow patterns;

[0027] Figure 3 One of the schematic diagrams of a display panel provided by an embodiment of the present invention;

[0028] Figure 4 A second schematic diagram of a display panel provided by an embodiment of the present invention;

[0029] Figure 5A third schematic diagram of a display panel provided by an embodiment of the present invention;

[0030] Figure 6 A fourth schematic diagram of a display panel provided in an embodiment of the present invention;

[0031] Figure 7 One of the schematic diagrams of the functional layer pattern provided by an embodiment of the present invention;

[0032] Figure 8 The second schematic diagram of the functional layer pattern provided by the embodiment of the present invention;

[0033] Fig. 9 The third schematic diagram of the functional layer pattern provided by the embodiment of the present invention;

[0034] Fig.10 The fourth schematic diagram of the functional layer pattern provided by the embodiment of the present invention;

[0035] Fig.11 for Figure 6 A partial enlarged schematic diagram of

[0036] Fig.12 A schematic diagram of a manufacturing process of a display panel provided by an embodiment of the present invention;

[0037] Fig.13 A simulation schematic diagram provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of well-known functions and well-known components.

[0041] The inventors of the present invention have found that there is a gap filled with a first gas (e.g., nitrogen N2) between the rigid packaging cover plate (the material of the packaging cover plate can be, for example, glass) and the OLED film layer. The refractive index difference between N2 and glass is relatively large, resulting in obvious iso-inclined interference of reflected light at the interface between the two layers. In the case of monochromatic light, when the optical path difference OPD1 is an even multiple of half the wavelength of the incident light, bright fringes will appear, and when the optical path difference OPD2 is an odd multiple of half the wavelength of the incident light, dark fringes will appear, such as Figure 1 As shown, the reflected light intensity changes alternately. In the case of complex light, different wavelengths of light have different refractive indices in the same medium, and the light intensity distribution positions are different after interference, causing dispersion, that is, rainbow patterns, such as Figure 2 shown.

[0042] In view of this, see Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, an embodiment of the present invention provides a display panel, comprising: a base substrate 2 and a packaging cover plate 2 arranged opposite to each other, and a light-emitting device 3 sealed between the base substrate 1 and the packaging cover plate 2; the light-emitting device 3 comprises a light-emitting layer 31 and a reflective electrode layer 32 located on the side of the light-emitting layer 31 facing the packaging cover plate 2, a gap S filled with a first gas is provided between the reflective electrode layer 32 and the packaging cover plate 2, and the difference between the refractive index of the first gas and the refractive index of the packaging cover plate 2 is greater than a first value; specifically, the first gas, for example, may be nitrogen N2, with a refractive index of 1.00027, the material of the packaging cover plate 2 may specifically be glass, with a refractive index of 1.5, the first value may specifically be 0.4 to 0.6, and specifically, the first value may be 0.5;

[0043] The display panel further includes: a patterned functional layer 4 disposed on a light propagation path, wherein the light propagation path is a path for external ambient light to be incident on the reflective electrode layer 32 via the packaging cover plate 2 .

[0044] In an embodiment of the present invention, the display panel also includes a patterned functional layer 4 arranged on the light propagation path. The patterned functional layer 4 can destroy the equal-inclination interference that occurs after the reflected light of the reflective electrode layer 32 is refracted by the first gas and out of the packaging cover plate 2, thereby improving rainbow pattern defects.

[0045] Specifically, the base substrate 1 and the package cover plate 2 may be sealed by a sealant 5 ; the reflective electrode layer 32 may specifically be a reflective cathode. Specifically, the display panel may further include an anode located between the base substrate 1 and the light-emitting layer 31 .

[0046] Specifically, the display panel in the embodiment of the present invention may be a rigid organic light emitting display panel.

[0047] In one possible implementation, combining Figure 3 As shown, the functional layer 4 is located on the side of the reflective electrode layer 32 facing the package cover plate 2. In this way, the thickness of the pattern portion 41 in the direction perpendicular to the base substrate 1 can be adjusted. When the light passes through the junction of the functional layer 4 and the first gas, the optical path difference is an odd multiple of half the wavelength, thereby achieving interference destructiveness and improving the problem of rainbow pattern defects. Fig.13 As a result of the simulation, it can be seen that after the functional layer 4 is set to reduce the reflectivity of the reflective electrode layer 32, the interference fringes are greatly weakened; or, combined with Figure 4 As shown, the functional layer 4 is located on the side of the package cover plate 2 away from the reflective electrode layer 32. In this way, the reflectivity of the package cover plate 2 is reduced by using the interference principle, thereby eliminating the equal-inclination interference; or, Figure 5 As shown, the functional layer 4 is located on the side of the package cover plate 2 facing the reflective electrode layer 32 , so that the reflectivity of the package cover plate 2 is reduced by utilizing the interference principle, thereby eliminating equal-inclination interference.

[0048] In one possible implementation, combining Figure 3 , Figure 4 and Figure 5As shown, the functional layer 4 includes a pattern portion 41 and four hollow portions 42 penetrating the functional layer, wherein the ratio of the total area of ​​the hollow portions 42 to the area of ​​the functional layer 4 is 45% to 55%, that is, the area of ​​the patterned functional layer 4 is 45% to 55% of the area of ​​the reflective electrode layer 32. Specifically, the ratio of the total area of ​​the hollow portions 42 to the area of ​​the functional layer 4 is 50%. In the embodiment of the present invention, the functional layer 4 includes a pattern portion 41 and four hollow portions 42 penetrating the functional layer. Specifically, the functional layer 4 can be made of inorganic materials (for example, SiNx or SiO2), and a functional film is first formed by chemical vapor deposition, and then a patterned functional layer 4 is prepared by mask exposure. The thickness of the pattern portion 41 in the direction perpendicular to the substrate 1 can be adjusted. When the light passes through the junction of the functional layer 4 and the first gas, the optical path difference is an odd multiple of half the wavelength, so that interference cancellation is achieved and the problem of rainbow pattern defects is improved. In addition, the ratio of the total area of ​​the hollow portion 42 to the area of ​​the functional layer 4 is 45% to 55%, for example, 50%, so that the total amount of the two parts of light that produce the optical path difference can be the same, thereby maximizing interference cancellation, reducing reflectivity, and eliminating equal-inclination interference.

[0049] In a possible implementation, the thickness d of the functional layer 4 satisfies the following relationship: (n1-n2)*2(d / sin45°)=550*(1 / 2), where n1 represents the refractive index of the functional layer, and n2 represents the refractive index of the first gas. Thus, when light passes through the interface between the functional layer 4 and the first gas, complete interference destructive effect is achieved so that the optical path difference is half the wavelength.

[0050] Specifically, for example, the patterned functional layer 4 can be prepared by using SiNx material and mask exposure method. At the wavelength of 550nm, to which the human eye is most sensitive, the refractive index n1 of SiNx is 1.903, and the refractive index n2 of nitrogen is 1.00027. Therefore, when light passes through the junction between the two, in order to make the optical path difference be half the wavelength (complete interference destructive), the thickness d of SiNx must satisfy (n1-n2)*2(d / sin45°)=550*(1 / 2), which can be calculated to be 97.5nm, about 100nm, or 0.1um.

[0051] For another example, a patterned functional layer is prepared using SiO2 material and mask exposure method. At a wavelength of 550nm, to which the human eye is most sensitive, the refractive index n1 of SiO2 is 1.48, and the refractive index n2 of nitrogen is 1.00027. Therefore, when light passes through the interface between the two, in order to make the optical path difference half the wavelength (complete interference destructive), the SiNx thickness d must satisfy (n1-n2)*2(d / sin45°)=550*(1 / 2), which is calculated to be 202.5nm, about 200nm, or 0.2um.

[0052] In one possible implementation, see Figure 7 As shown, the pattern portion 41 includes a plurality of rectangular first pattern strips 411 extending along the first direction A1 and sequentially arranged along the second direction A2, and the hollow portion 42 includes a plurality of rectangular first hollow strips 421 extending along the first direction A1 and sequentially arranged along the second direction A2, and the first pattern strips 411 and the first hollow strips 421 are alternately arranged along the second direction A2;

[0053] Alternatively, see Figure 8 As shown, the pattern portion 41 includes a plurality of wavy second pattern strips 412 extending along the first direction A1 and sequentially arranged along the second direction A2, and the hollow portion 42 includes wavy second hollow strips 422 extending along the first direction A1 and sequentially arranged along the second direction A2, and the second pattern strips 412 and the second hollow strips 422 are alternately arranged along the second direction A2;

[0054] Alternatively, see Fig. 9 As shown, the pattern portion 41 includes a plurality of first pattern groups 413 extending along the first direction A1 and arranged in sequence along the second direction A2, and the first pattern group 413 includes a plurality of first pattern blocks 4131 arranged at intervals along the first direction A1; the hollow portion 42 includes a first hollow block 423 located between adjacent first pattern blocks B1 in the first pattern group 413, and the first pattern blocks B1 of adjacent first pattern groups 413 are staggered;

[0055] Alternatively, see Fig.10 As shown, the pattern portion 41 includes a second pattern group 414 and a third pattern group 415 extending along the second direction A2, and the second pattern group 414 and the third pattern group 415 are alternately arranged along the first direction A1; the second pattern group 414 includes a plurality of second pattern blocks 4141 spaced apart from each other, and the second pattern blocks 4141 may have a general pattern of an elliptical lantern; the third pattern group 415 includes a plurality of pattern units 4150 connected in sequence along the second direction A2, and the pattern unit 4150 includes two U-shaped openings 4151 arranged along the first direction A1, and in the same pattern unit 4150, the opening directions of the two U-shaped openings 4151 are the same, for example, the bayonet is facing the right side, and one side of the U-shaped opening 4151 intersects with one side of the other U-shaped opening 4151 to form an acute angle α; the second pattern block 4141 is parallel to the first symmetry axis EF in the first direction A1 and is located between two adjacent pattern units 4150; the hollow portion 42 is located in the area outside the pattern portion 41, and is complementary to the shape of the pattern portion 41.

[0056] In one possible implementation, combining Figure 6 and Fig.11 As shown, Fig.11 for Figure 6The enlarged schematic diagram of the protrusion combination 43 in the middle, the functional layer 4 includes a substrate 43 and a plurality of array-distributed protrusion combinations 44 located on one side of the substrate 43, the protrusion combination 44 includes a first sub-protrusion 441, and a second sub-protrusion 442 surrounding the first sub-protrusion 441; the protrusion combinations 44 in adjacent rows are staggered. In the embodiment of the present invention, after preparing the CTD, an organic material (for example, acrylic or polyimide) can be used to emboss the structure through a half-tone mask exposure process, and then a subsequent packaging process is performed. When the ambient light is reflected on the surface of the reflective electrode layer 32, it will pass through the embossing scattering layer, destroying the original light path of the equal-inclination interference, that is, suppressing the equal-inclination interference and improving the problem of rainbow patterns.

[0057] It can be understood that, relative to inorganic materials, organic materials can be formed to have a greater thickness through a coating process, and then a concave-convex (embossing) structure can be formed through a half-tone mask process; since inorganic materials are usually formed by chemical vapor deposition, the thickness of the formed film layer is limited, and thus a hollowing through the functional layer 4 can be formed by mask exposure.

[0058] In one possible implementation, combining Fig.11 As shown, the outer contour of the first sub-protrusion 441 is similar to the outer contour of the second sub-protrusion 442. Specifically, for example, the outer contour of the first sub-protrusion 441 and the outer contour of the second sub-protrusion 442 are both hexagonal.

[0059] Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the display panel provided by the embodiment of the present invention.

[0060] Based on the same inventive concept, the embodiment of the present invention further provides a method for manufacturing a display panel as provided in the embodiment of the present invention, see Fig.12 As shown, the production method includes:

[0061] Step S100, forming a light-emitting layer and a reflective electrode layer in sequence on one side of a base substrate;

[0062] Step S200, forming a functional layer located on the light propagation path and having a patterned structure, and sealing the substrate and the packaging cover plate, and forming a gap with a first gas between the reflective electrode layer and the packaging cover plate, the difference between the refractive index of the first gas and the refractive index of the packaging cover plate is greater than the first value, and the light propagation path is the path of the external ambient light incident on the reflective electrode layer through the packaging cover plate.

[0063] In a possible implementation, step S200, forming a functional layer located on the light propagation path and having a patterned structure, and sealing the substrate and the package cover plate may include:

[0064] forming a functional thin film on a side of the reflective electrode layer away from the light-emitting layer;

[0065] The functional film is exposed through a half-tone mask to form a functional layer including a substrate and a plurality of protrusions located on one side of the substrate.

[0066] The beneficial effects of the embodiments of the present invention are as follows: In the embodiments of the present invention, the display panel also includes a patterned functional layer 4 arranged on the light propagation path. The patterned functional layer 4 can destroy the reflected light of the reflective electrode layer 32, and the equal-inclined interference that occurs after the reflected light is refracted out of the packaging cover plate 2 by the first gas, thereby improving the rainbow pattern defect.

[0067] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A display panel, characterized in that: include: A base substrate and a packaging cover plate arranged opposite to each other, and a light emitting device sealed between the base substrate and the packaging cover plate; The light emitting device comprises a light emitting layer and a reflective electrode layer located on a side of the light emitting layer facing the package cover plate, a gap filled with a first gas is provided between the reflective electrode layer and the package cover plate, and a difference between a refractive index of the first gas and a refractive index of the package cover plate is greater than a first value; The display panel further comprises: a patterned functional layer disposed on a light propagation path, wherein the light propagation path is a path for external ambient light to be incident on the reflective electrode layer through the packaging cover plate; The functional layer is located on a side of the reflective electrode layer facing the package cover plate; or, the functional layer is located on a side of the package cover plate away from the reflective electrode layer; or, the functional layer is located on a side of the package cover plate facing the reflective electrode layer; the functional layer comprises a pattern portion and a hollow portion penetrating the functional layer, wherein the ratio of the total area of ​​the hollow portion to the area of ​​the functional layer is 45% to 55%; The pattern portion includes a plurality of rectangular first pattern strips extending along a first direction and sequentially arranged along a second direction, the hollow portion includes a plurality of rectangular first hollow strips extending along the first direction and sequentially arranged along the second direction, and the first pattern strips and the first hollow strips are alternately arranged along the second direction; Alternatively, the pattern portion includes a plurality of wavy second pattern strips extending along the first direction and sequentially arranged along the second direction, the hollow portion includes wavy second hollow strips extending along the first direction and sequentially arranged along the second direction, and the second pattern strips and the second hollow strips are alternately arranged along the second direction; Alternatively, the pattern portion includes a second pattern group and a third pattern group extending along the second direction, and the second pattern group and the third pattern group are alternately arranged along the first direction; the second pattern group includes a plurality of second pattern blocks spaced from each other; the third pattern group includes a plurality of pattern units connected in sequence along the second direction, and the pattern unit includes two U-shaped openings arranged along the first direction, and in the same pattern unit, the opening directions of the two U-shaped openings are the same, wherein one side of the U-shaped opening intersects with one side of the other U-shaped opening to form an acute angle; the second pattern block is parallel to the first axis of symmetry in the first direction and is located between two adjacent pattern units; the hollow portion is located in an area outside the pattern portion and is complementary to the shape of the pattern portion.

2. The display panel according to claim 1, wherein: The thickness d of the functional layer satisfies the following relationship: (n1-n2)*2(d / sin45°)=550*(1 / 2), wherein n1 represents the refractive index of the functional layer, and n2 represents the refractive index of the first gas.

3. The display panel according to claim 1, wherein: The functional layer includes a substrate and a plurality of array-distributed protrusion combinations located on one side of the substrate, wherein the protrusion combination includes a first sub-protrusion and a second sub-protrusion surrounding the first sub-protrusion; the protrusion combinations in adjacent rows are staggered.

4. The display panel according to claim 3, wherein: The outer contour of the first sub-protrusion is similar in shape to the outer contour of the second sub-protrusion.

5. A display device, characterized in that: Comprising the display panel as described in any one of claims 1 to 4.

6. A method for manufacturing a display panel according to any one of claims 1 to 4, characterized in that: The production method comprises: A light-emitting layer and a reflective electrode layer are sequentially formed on one side of the base substrate; A functional layer having a patterned structure and located on a light propagation path is formed, the base substrate and the packaging cover are sealed, and a gap having a first gas is formed between the reflective electrode layer and the packaging cover, the difference between the refractive index of the first gas and the refractive index of the packaging cover is greater than a first value, and the light propagation path is a path for external ambient light to be incident on the reflective electrode layer through the packaging cover.

7. The method according to claim 6, characterized in that: The forming of the functional layer having a patterned structure and being located on the light propagation path, and sealing the substrate and the package cover plate, comprises: forming a functional thin film on a side of the reflective electrode layer away from the light-emitting layer; The functional film is exposed through a half-tone mask to form a functional layer including a substrate and a plurality of protrusions located on one side of the substrate.

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