Packaging layer and display screen

Abstract

The packaging layer is arranged on the light emitting side of a lamp panel of the display screen and comprises a light-permeable base material layer and a microstructure layer, the base material layer is arranged on the lamp panel, the microstructure layer is arranged on the face, away from the lamp panel, of the base material layer and is composed of a plurality of miniature protrusions, the miniature protrusions correspond to one light-emitting element, and the light-emitting element is arranged on the microstructure layer. The surface of each miniature protrusion is a cambered surface which is randomly distributed in size, light emitted from the lamp panel is emitted after being refracted by the surface of each miniature protrusion, the light emitting angle and the light mixing uniformity are improved, the light emitting angle difference is small after light of different colors is refracted by the surface of each miniature protrusion, and the problem that color cast exists when a display screen is observed at a large visual angle can be avoided or improved. In addition, the gaps are formed between at least part of the adjacent micro protrusions, the reflectance of the gap areas is different from the reflectance of the micro protrusions, the overall reflectance of the display screen can be adjusted through the gap areas, and the display effect of the display screen can be further improved.

Description

Technical Field

[0001] The utility model relates to the display field, in particular to a packaging layer and a display screen. Background Art

[0002] Light Emitting Diode (LED) is a semiconductor light-emitting device widely used in the display field. Its light-emitting component is a light-emitting chip containing a PN junction. By applying voltage to the electrodes of the light-emitting chip, the electrons and holes therein recombine and radiate energy, thereby emitting visible light.

[0003] As a new generation of display technology, the display screen made of Mini-LED (Mini-Light Emitting Diode) has the advantages of high brightness, high color gamut, high contrast, and higher viewing angle display, and has become a development trend. The pixel units of this type of display screen usually include LED chips of three primary colors: red (R), green (G), and blue (B), and the colors of the light they emit include three colors: R, G, and B. Due to the different luminous characteristics of LED chips of different luminous colors, there is inconsistency in the brightness attenuation at a wide viewing angle between the LED chips of different luminous colors in each pixel unit, which results in different brightness attenuation ratios of LED chips of different luminous colors at a wide viewing angle compared to the normal viewing angle, which in turn causes the display screen to have a color cast problem when observed at a wide viewing angle, resulting in poor display effects and low user experience satisfaction. Utility Model Content

[0004] In view of the deficiencies of the above-mentioned related technologies, the present application provides a packaging layer and a display screen to solve the problem of how to improve the color cast of the existing display screen when observed at a wide viewing angle.

[0005] In order to solve the above technical problems, the present application provides an encapsulation layer, which is used for a display screen, the display screen includes a light board, the encapsulation layer is arranged on the light-emitting side of the light board, and covers each light-emitting element on the light board; the encapsulation layer includes a light-transmissive substrate layer and a microstructure layer;

[0006] The substrate layer is arranged on the lamp board, and the microstructure layer is arranged on a surface of the substrate layer away from the lamp board; the microstructure layer is composed of a plurality of micro-protrusions, at least some of the adjacent micro-protrusions among the plurality of the micro-protrusions have gaps, and a plurality of the micro-protrusions correspond to one light-emitting element, the surface of each of the micro-protrusions is a curved surface, and the sizes of each of the micro-protrusions are randomly distributed.

[0007] Optionally, the maximum diameter of each of the micro-protrusions is randomly distributed between 1 μm and 20 μm, and the maximum height of each of the micro-protrusions is randomly distributed between 0.5 μm and 10 μm.

[0008] Optionally, the substrate layer and each of the micro-protrusions are integrally formed.

[0009] Optionally, the substrate layer and each of the micro-protrusions may be formed of the same colloid.

[0010] Optionally, the substrate layer includes a film material layer, and the microstructure layer is a coating layer disposed on a side of the film material layer away from the light panel.

[0011] Optionally, the hardness of each of the micro-protrusions is greater than 1H, and the adhesion of each of the micro-protrusions on the substrate layer is greater than 2B.

[0012] Optionally, the reflectivity of the surface of each of the micro-protrusions is less than 10%.

[0013] Optionally, some of the micro-protrusions overlap each other, or there are gaps between adjacent micro-protrusions.

[0014] Optionally, the surface of the substrate layer between adjacent micro-protrusions is a plane.

[0015] Optionally, the density of the micro-protrusions per unit area on the substrate layer is uniform.

[0016] Optionally, the ratio of the sum of the orthographic projection areas of the micro protrusions within a unit area on the substrate layer to the unit area is 30% to 95%.

[0017] Based on the same utility model concept, the present application also provides a display screen, including a light board and the packaging layer as described above, wherein the packaging layer is arranged on the light emitting side of the light board and covers each light emitting element on the light board.

[0018] Beneficial effects:

[0019] The encapsulation layer provided in the present application is arranged on the light-emitting side of the light board of the display screen, covering each light-emitting element on the light board; the encapsulation layer includes a light-transmissive substrate layer and a microstructure layer, that is, the light emitted by the light-emitting element on the light board is emitted through the substrate layer and the microstructure layer; wherein the substrate layer is arranged on the light board, and the microstructure layer is arranged on the side of the substrate layer away from the light board, which is composed of a plurality of micro-protrusions, and the surface of each micro-protrusion is an arc surface, that is, each micro-protrusion is a lens-like shape similar to a convex lens, and the size of each micro-protrusion is randomly distributed, on the one hand, the light emitted from the light board is refracted by the surface of each micro-protrusion and then emitted, thereby improving the light emission angle and the uniformity of light mixing, and on the other hand, the light of different colors (such as R, G, B) emitted from the light board can be refracted by the surface of each micro-protrusion. The light emission angle difference is small, that is, the brightness attenuation of light of different colors at each viewing angle can be ensured to be consistent as much as possible, thereby avoiding or improving the color cast problem of the display screen when observed at a large viewing angle, and improving the display effect and user experience satisfaction;

[0020] In the present application, the multiple micro-protrusions of the microstructure layer correspond to a light-emitting element on the lamp board, that is, the orthographic projection area of ​​the multiple micro-protrusions on the lamp board is located in or intersects with the orthographic projection area of ​​a light-emitting element on the lamp board, so that the light emitted from the light-emitting surface of a light-emitting element can be fully mixed by the multiple micro-protrusions;

[0021] In addition, among the several micro-protrusions of the present application, at least some of the adjacent micro-protrusions have gaps between them, and the reflectivity of the gap area between the adjacent micro-protrusions is different from the reflectivity of each micro-protrusion. Therefore, the overall reflectivity of the display screen can be comprehensively adjusted according to needs through the gap area, thereby further improving the display effect of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the longitudinal cross-sectional structure of the encapsulation layer provided in the embodiment of the utility model Figure 1 ;

[0023] Figure 2 A schematic diagram of the longitudinal cross-sectional structure and dimensions of a micro-protrusion provided in an embodiment of the utility model;

[0024] Figure 3 A schematic diagram of the encapsulation layer rendering provided by an embodiment of the utility model;

[0025] Figure 4 Schematic diagram of the longitudinal cross-sectional structure of the encapsulation layer provided in the embodiment of the utility model Figure 2 ;

[0026] Figure 5 Schematic diagram of the longitudinal cross-sectional structure of the encapsulation layer provided in the embodiment of the utility model Figure 3 ;

[0027] Figure 6Schematic diagram of the longitudinal cross-sectional structure of the encapsulation layer provided in the embodiment of the utility model Figure 4 ;

[0028] Figure 7 Schematic diagram of the longitudinal cross-sectional structure of the encapsulation layer provided in the embodiment of the utility model Figure 5 ;

[0029] Figure 8 Schematic diagram of the longitudinal cross-sectional structure of the encapsulation layer provided in the embodiment of the utility model Figure 6 ;

[0030] Fig. 9 A schematic diagram of a longitudinal cross-sectional structure of a light board of a display screen provided by an embodiment of the utility model and provided with an encapsulation layer;

[0031] Fig.10 A rendering schematic diagram of a light board of a display screen provided by an embodiment of the utility model and provided with an encapsulation layer;

[0032] Fig.11 A microscope image of micro protrusions provided in an embodiment of the utility model;

[0033] Fig.12 A schematic diagram of a prism-shaped protrusion longitudinal cross-section structure provided in an embodiment of the utility model;

[0034] Fig.13 Microscope image of flocculent irregular texture protrusions provided in the embodiment of the utility model;

[0035] Fig.14 A schematic diagram of the placement of a display screen in a test environment provided by an embodiment of the utility model;

[0036] Fig.15 A schematic diagram for comparing color temperature curves provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] Display screens made of Mini-LED have become a development trend as a new generation of display technology. For example, Mini COB (Chip On Board) display screens use COB packaging to directly solder Mini LED chips to the PCB board using solder paste. The Mini LED chips that constitute a pixel unit usually include LED chips of three primary colors: red, R, G, and B. Due to the different luminous characteristics of LED chips of different luminous colors, the brightness attenuation of different colors of light in each pixel unit is inconsistent at a wide viewing angle. For example, in some application scenarios, after the attenuation of the light of R color at a wide viewing angle, only the synthetic light mainly composed of G and B colors can be seen. Compared with the synthetic light of R, G, and B colors seen at a normal viewing angle, there is an obvious color cast problem when observed at a wide viewing angle. For ease of understanding, the normal viewing angle in this embodiment is the angle perpendicular to the display screen, that is, 90°, that is, the angle at which the user looks directly at the display screen; the wide viewing angle is the angle at which the user looks at the display screen from the side (such as the left side, right side, top side or bottom side, etc.) of the display screen. For example, taking the left side and right side as examples, the wide viewing angle can be set to but not limited to 150° to 180° and 0° to 30°. Of course, the wide viewing angle in this embodiment can be flexibly adjusted, for example, it can also be set to a specific value (such as 170° and 10°), or set to a range value, such as 170° to 180° and 0° to 10°, etc.

[0040] In response to the above problems, the present embodiment provides a packaging layer applied to a display screen. The display screen in the present embodiment includes a light board, on which a number of light-emitting elements are provided. In some examples of the present embodiment, the light-emitting element may be an LED chip, and the LED chip is provided on the light board in a COB packaging manner; in other examples, the light-emitting element may also be an LED chip packaging device, such as but not limited to a CSP (Chip Scale Package) LED packaging device and a NCSP (Near Chip Scale Package) LED packaging device.

[0041] The encapsulation layer in this embodiment is arranged on the light emitting side of the lamp board, covering each light emitting element on the lamp board; see Figure 1As shown, the encapsulation layer includes a light-transmissive substrate layer 1 and a microstructure layer 2, the substrate layer 1 is arranged on the light board, and the microstructure layer 2 is arranged on the side of the substrate layer 1 away from the light board; the microstructure layer 2 is composed of a plurality of micro-protrusions 21, and there is a gap between at least some of the adjacent micro-protrusions 21 among the plurality of micro-protrusions 21 (that is, at least some of the adjacent micro-protrusions 21 among the plurality of micro-protrusions 21 are separated from each other), and a plurality of micro-protrusions 21 correspond to a light-emitting element on the light board, that is, the orthographic projection area of ​​a plurality of micro-protrusions 21 on the light board is located in the orthographic projection area of ​​a light-emitting element on the light board or intersects with it, so that the light emitted from the light-emitting surface of a light-emitting element can be fully mixed by a plurality of micro-protrusions 21 to enhance the display effect. In this embodiment, the surface of each micro-protrusion 21 is a curved surface (that is, each micro-protrusion 21 is a lens-like shape similar to a convex lens), and the size of each micro-protrusion 21 is randomly distributed (thereby facilitating random light mixing and enhancing the light mixing effect). The above microstructure layer 2 in this embodiment is set up, on the one hand, so that the light emitted from the light board is emitted after being refracted by the surface of each micro-protrusion 21, thereby improving the light output angle and the uniformity of light mixing. On the other hand, it can make the light of different colors emitted from the light board refracted by the surface of each micro-protrusion 21 have a smaller difference in the light output angle, which can ensure that the brightness attenuation of different colors of light at each viewing angle is consistent as much as possible, especially to minimize the brightness attenuation difference at a large viewing angle, thereby avoiding or improving the color cast problem of the display screen when observed at a large viewing angle, and improving the display effect and user experience satisfaction. At least some of the adjacent micro-protrusions 21 are provided with gaps. Since the reflectivity of the gap area between the adjacent micro-protrusions 21 is different from the reflectivity of each micro-protrusion 21, the overall reflectivity of the display screen can be adjusted comprehensively according to the needs through the gap area, thereby further improving the display effect of the display screen.

[0042] It should be understood that in this embodiment, on the basis of the surface of each micro-protrusion 21 being a curved surface, the specific shape of each micro-protrusion 21 can be flexibly set. For example, in some examples, the specific shape of each micro-protrusion 21 can be the same, or a part of the micro-protrusions 21 can be the same shape, and a part of the micro-protrusions 21 can be different shapes. In other examples, the specific shape of each micro-protrusion 21 can be randomly formed on the basis of the above, thereby further improving the randomness and effect of light mixing. Figure 1 For example, according to Figure 1 It can be seen that the overall shape of the longitudinal section of each micro-protrusion 21 is hemispherical, but the specific shapes of some micro-protrusions 21 are different, and the specific shapes of some micro-protrusions 21 are the same; Figure 1 The specific shape of each micro protrusion 21 shown in the figure can be formed in a random manner or in a fixed arrangement rule.

[0043] It should be understood that in this embodiment, the specific size range of each micro-protrusion 21 can be flexibly set according to, but not limited to, specific application scenarios. For example, in some examples, the maximum diameter of each micro-protrusion 21 is randomly distributed between 1 μm and 20 μm, and the maximum height of each micro-protrusion 21 is randomly distributed between 0.5 μm and 10 μm. In some of these application scenarios, the maximum diameter of the micro-protrusion 21 can be set to be associated with its maximum height. Taking a single micro-protrusion 21 as an example, see Figure 2 As shown, its maximum diameter D can be understood as the maximum width of the micro protrusion 21, and its maximum height H is the largest of the heights from each point on the surface of the micro protrusion 21 to the side of the substrate layer 1 away from the light board. Taking the Mini COB (Chip On Board) display screen as an example, several light-emitting elements on the light board of the display screen are Mini LED chips, wherein the side length of the Mini LED chip is 100μm to 300μm, and the maximum diameter of each micro-protrusion 21 is randomly distributed between 1μm and 20μm, for example, the specific value may be greater than or equal to 1μm, less than 3μm, or greater than or equal to 3μm, less than or equal to 10μm, or greater than or equal to 10μm, less than or equal to 20μm, etc.; the maximum height H of each micro-protrusion 21 is randomly distributed between 0.5μm and 10μm, for example, the specific value may be greater than or equal to 0.5μm, less than or equal to 2.5μm, or greater than 2.5μm, less than or equal to 10μm, or greater than or equal to 5μm, less than or equal to 10μm, etc. Figure 1 A rendering of the encapsulation layer shown in Figure 3 As shown, the maximum diameter of each micro-protrusion 21 is much smaller than the side length of the light-emitting element. A plurality of micro-protrusions 21 are correspondingly arranged on a light-emitting element. The light emitted from the light-emitting surface of a light-emitting element can be fully mixed by the plurality of micro-protrusions 21.

[0044] In some examples of this embodiment, the density of the micro protrusions 21 per unit area on the substrate layer 1 is uniform. That is, the density of the micro protrusions 21 per unit area on the substrate layer 1 is uniform, so that the light on the light board can be ensured to be consistent in each unit area after passing through the packaging layer, thereby improving the display effect.

[0045] In this embodiment, the density of the micro-protrusions 21 per unit area on the substrate layer 1 can be flexibly set according to specific application requirements. In some examples, when a higher overall reflectivity is required, the density of the micro-protrusions 21 per unit area on the substrate layer 1 is reduced. In other examples, when a lower overall reflectivity is required, the density of the micro-protrusions 21 per unit area on the substrate layer 1 is increased accordingly. That is, in this embodiment, the reflectivity of the gap area between adjacent micro-protrusions 21 is higher than the reflectivity of the micro-protrusions 21. When the density of the micro-protrusions 21 is lower, the corresponding gap area is larger, so the overall reflectivity can be improved. When the density of the micro-protrusions 21 is higher, the corresponding gap area is smaller, so the overall reflectivity can be reduced. For example, see Figure 1 and Figure 4 As shown, Figure 4 The density of the micro protrusions 21 in the encapsulation layer shown is less than Figure 1 The density of micro protrusions 21 in the encapsulation layer is shown, Figure 4 The overall reflectivity of the encapsulation layer shown is greater than Figure 1 The overall reflectivity of the packaging layer is shown. It can be seen that in this embodiment, the overall reflectivity of the packaging layer can be flexibly adjusted by adjusting the density of the micro-protrusions 21 per unit area on the substrate layer 1 (the gap area between the corresponding adjacent micro-protrusions 21 changes accordingly), so as to meet the needs of various application scenarios, with good flexibility and a wide range of applications.

[0046] In some examples of this embodiment, the density of the micro protrusions 21 in each unit area on the substrate layer 1 can be characterized by the ratio of the sum of the orthographic projection areas of the micro protrusions 21 in a unit area on the substrate layer 1 to the unit area. In this example, the ratio of the sum of the orthographic projection areas of the micro protrusions 21 in a unit area on the substrate layer 1 to the unit area can be set to 30% to 95%, which can be flexibly set according to the overall reflectivity requirements of the display screen. For example, in some application scenarios, when the overall reflectivity of the display screen is required to be higher, the ratio of the sum of the orthographic projection areas of the micro-protrusions 21 within a unit area of ​​the substrate layer 1 within the unit area to the unit area can be set to a smaller value within 30% to 95%, such as 30% to 40%, 30% to 50%, 40% to 50%, etc.; in other application scenarios, when the overall reflectivity of the display screen is required to be lower, the ratio of the sum of the orthographic projection areas of the micro-protrusions 21 within a unit area of ​​the substrate layer 1 within the unit area to the unit area can be set to a larger value within 30% to 95%, such as greater than 50%, less than or equal to 60%, 60% to 70%, 70% to 80%, 80% to 90%, 90% to 95%, greater than 50%, less than or equal to 70%, greater than or equal to 70%, less than or equal to 90%, greater than 50%, less than or equal to 60%, less than or equal to 95%, etc. Of course, it should be understood that in other examples of this embodiment, the density of the micro-protrusions 21 per unit area on the substrate layer 1 can also be represented by the number of micro-protrusions 21 per unit area on the substrate layer 1, and this equivalent replacement method will not be repeated here.

[0047] In some examples of this embodiment, the reflectivity of the surface of each micro-protrusion 21 can be set to be less than 10%, and correspondingly, the reflectivity of the gap area between each adjacent micro-protrusion 21 is greater than 10%; in this application example, the reflectivity of the surface of each micro-protrusion 21 can be set to be the same, and of course, it can also be set according to requirements so that the reflectivity of the surface of some micro-protrusions 21 is the same, and the reflectivity of the surface of some micro-protrusions 21 is different. In this application example, the reflectivity of the gap area between adjacent micro-protrusions 21 can be set to be the same, and the reflectivity of the gap area between some adjacent micro-protrusions 21 can also be set to be the same, and the reflectivity of the gap area between some adjacent micro-protrusions 21 can be different. The specific settings can be flexibly made according to application requirements, and the applicability is good.

[0048] In some examples of this embodiment, gaps may be provided between adjacent micro-protrusions 21, that is, each micro-protrusion 21 is provided separately, for example, see Figure 4As shown, there is a gap C between each adjacent micro-protrusion 21. In some examples of this embodiment, the surface of the substrate layer 1 not covered by the micro-protrusions 21 can be set as a plane, and of course, it can also be set as a curved surface or an inclined surface according to needs. For example, in some application scenarios, the surface of the substrate layer 1 located between adjacent micro-protrusions 21 is set as a plane, thereby improving the controllability and consistency of the light mixing effect, reducing the difficulty of production, simplifying the structure, and improving the yield rate.

[0049] In some examples of this embodiment, some adjacent micro-protrusions 21 may overlap each other, for example, Figure 5 As shown, two adjacent micro protrusions 21 shown in the D1 area overlap each other in the height direction. Figure 5 As shown, two adjacent micro-protrusions 21 shown in the D2 domain overlap in the horizontal direction. Of course, the above overlapping methods are only some examples for ease of understanding, and other overlapping methods may also be included. For example, three or more micro-protrusions 21 may be set to overlap, and the overlapping methods include but are not limited to at least one of the above methods, such as three or more micro-protrusions 21 all overlap in sequence in the height direction, or all overlap in the horizontal direction, or one part overlaps in the height direction and the other part overlaps in the horizontal direction. By overlapping some adjacent micro-protrusions 21 with each other 2, the shape and size formed after the micro-protrusions 21 overlap are enriched, thereby enriching the light mixing effect and improving the display effect.

[0050] In some examples of this embodiment, the base material layer 1 and each micro protrusion 21 included in the encapsulation layer are integrally formed, which can simplify the structure and the manufacturing process, reduce the cost, and improve the adhesion of the micro protrusion 21 to the base material layer 1, thereby improving the reliability. Figure 6As shown, the substrate layer 1 and each micro-protrusion 21 can be formed of the same colloid, such as but not limited to silicone and epoxy resin. In this example, the substrate layer 1 and the micro-protrusion 21 can be formed as an integral body by embossing the surface of the epoxy resin layer or the silicone layer through, but not limited to, a release film. At this time, a concave portion corresponding to each micro-protrusion 21 can be pre-formed on the release film, and then the release film is used to emboss the surface of the epoxy resin layer or the silicone layer in a semi-cured state to form the micro-protrusion 21 (i.e., to form the microstructure layer 2); of course, a liquid epoxy resin layer or silicone layer can be directly filled on the side of the release film where the concave portion is formed and cured, so that the micro-protrusion 21 is formed on the side of the epoxy resin layer or the silicone layer in contact with the release film. In this example, a semi-cured epoxy resin layer or silicone layer can also be formed first, and then the micro-protrusion 21 can be formed by rolling the surface of the epoxy resin layer or the silicone layer through, but not limited to, a roller (such as a copper roller) with a corresponding concave-convex structure on the surface. Correspondingly, in this example, when the surface of the substrate layer 1 located between adjacent micro-protrusions 21 needs to be set as a plane, the surface area corresponding to the release film or the roller is set as a plane; when the surface of the substrate layer 1 located between adjacent micro-protrusions 21 needs to be set as a curved surface (such as a concave curved surface) or a slope, the surface area corresponding to the release film or the roller is set to a curved surface of a corresponding shape (such as a corresponding convex curved surface) or a slope; it can be seen that the material used for the encapsulation layer in this example has good versatility, the manufacturing process is simple and easy to implement, and the cost is low and the yield is high.

[0051] In some other examples of the present embodiment, the base material layer 1 and each micro protrusion 21 included in the encapsulation layer may also be a non-integrated molding structure. That is, the base material layer 1 and each micro protrusion 21 are different physical layers, both of which may be glue layers, or the base material layer 1 may be a glue layer, and the micro protrusion 21 may be a coating layer formed by coating, or the base material layer 1 may be a film material layer, and the micro protrusion 21 may be a glue layer or a coating layer formed by coating, wherein when the micro protrusion 21 is formed by coating, spherical particles may be added to the glue of the coating layer, but not limited to, and after the glue is cured, the spherical particles expose a portion of the glue level to form surface raised textures. For example, see an application example. Figure 7 As shown, the substrate layer 1 includes a film layer 11, and each micro-protrusion 21 included in the micro-structure layer 2 is a coating layer provided on a side of the film layer 11 away from the light board; for example, it can be but not limited to a PET (Polyethyleneterephthalate, commonly known as polyester resin) film layer coated to form each micro-protrusion 21. Of course, in some application examples, the substrate layer 1 includes not only the film layer 11, but also Figure 8 As shown, a sealing layer 12 or other layers may be included under the film material layer 11 , which will not be described in detail herein.

[0052] The above are just a few examples for easy understanding of the packaging layer structure and manufacturing process. It should be understood that the micro-protrusions 21 in this embodiment are not limited to being formed by the coating method shown in the above example, but can also be formed by at least one of but not limited to etching process, physical sandblasting process, exposure and development process, which will not be described one by one here.

[0053] In this embodiment, in order to improve the stability of the packaging layer structure and the reliability during use, the hardness of each micro-protrusion 21 can be set to be greater than 1H, and the adhesion force of each micro-protrusion 21 on the substrate layer 1 can be set to be greater than 2B; thereby preventing each micro-protrusion 21 from being easily broken by external force or falling off from the substrate layer 1 during use.

[0054] This embodiment also provides a display screen, which can be applied to but not limited to televisions, curtain walls, vehicle-mounted equipment, mobile devices, and wearable devices. The display screen includes a light board and a packaging layer. The packaging layer is arranged on the light-emitting side of the light board, and the packaging layer is a packaging layer as shown in any of the above examples.

[0055] An exemplary display screen 100 is shown in Fig. 9 As shown, it includes a light board 3, wherein the light board 3 includes a conductive substrate 31 (such as various circuit boards, ceramic substrates, glass substrates, etc.) and light-emitting elements 32 arranged on the conductive substrate 31, and also includes a packaging layer arranged on the conductive substrate 31 to cover each light-emitting element 32. The packaging layer is a structure shown in any of the above examples, including a substrate layer 1 and a microstructure layer 2 arranged on a side of the substrate layer 1 away from the light board 3, and the microstructure layer 2 is formed by a plurality of micro protrusions 21. See an example of a rendering of a partial area of ​​the display screen 100. Fig.10 As shown, a microscope picture of a real object of a part of the area of ​​several micro protrusions 21 is shown in Fig.11 shown.

[0056] In this embodiment, the researchers found that replacing the micro protrusions 21 in the microstructure layer 2 with Fig.13 The microscope shown shows flocculent irregular lines and protrusions, among which Fig.13 See the longitudinal section diagram of the flocculent irregular pattern protrusions shown in Fig.12 As shown, it is in the shape of a prism, and each prism-shaped protrusion 4 is connected in sequence. After the red, green and blue lights are refracted by the prism-shaped protrusion 4, there is a large difference in the light output angles. As a result, at a wide viewing angle, only blue-green synthetic light can be seen, and there is no red light or it is greatly reduced, resulting in a relatively obvious color cast problem.

[0057] For ease of understanding, Fig.10 The display screen 100 shown is used as a comparative example 2. Fig.10The display screen in which the micro protrusions 21 are replaced with prism-shaped protrusions 4 is used as comparative example 1. The light panels in the two comparative examples are both P1.25 pixel pitch, both use flip-chip LED chips, and are produced in the same batch to ensure the consistency and comparability of the two as much as possible. Fig.14 As shown, two display screens 100 are placed vertically on a test platform under the same test environment, both display white at maximum brightness, and a color temperature meter (also called a colorimeter) is used to measure and record color temperature data at intervals of 10° from a horizontal angle of 0° to 180°. The obtained record table is shown in the following Table 1:

[0058] Table 1

[0059] angle Example 1 Color temperature (K) Example 2 Color temperature (K) 0° 13957.45 11508.76 10° 9300 8198 20° 8673 7836 30° 8057 7560 40° 7591 7297 50° 7249 7111 60° 7078 7009 70° 7020 6992 80° 7057 7050 90° 7196 7148 100° 7324 7277 110° 7485 7431 120° 7754 7647 130° 8127 7959 140° 8618 8314 150° 9142 8675 160° 9852 8981 170° 10183 8985 180° 10537 10521

[0060] See the color temperature curve comparison chart obtained based on the above test comparison data. Fig.15 As shown in Table 1 and Fig.15 It can be seen that the color temperature curve of the display screen in Example 1 from 0° to 180° is as follows: Fig.15 Curve A corresponding to Example 1, when viewed at a wide viewing angle, has a larger color temperature change than that of a 90° viewing angle, with a maximum difference of 3163K (170° minus 70°, 0° and 180° data excluded), and still shows obvious color cast. The color temperature curve of the display screen from 0° to 180° in Example 1 is as follows: Fig.15 Curve B corresponding to Example 2 shows that the color temperature changes less at a wide viewing angle than at a 90° viewing angle, with a maximum difference of 1993K (170° minus 70°, with 0° and 180° data excluded). Compared with the maximum difference of 3163K in Example 1, the difference is reduced by nearly half, with no obvious color cast. This can avoid or improve the color cast problem of the display when viewed at a wide viewing angle, thereby improving the display effect and user experience satisfaction.

[0061] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A packaging layer, the packaging layer is used for a display screen, the display screen includes a light board, characterized in that: The encapsulation layer is arranged on the light-emitting side of the lamp board, covering each light-emitting element on the lamp board; the encapsulation layer includes a light-transmissive substrate layer and a microstructure layer; The substrate layer is arranged on the lamp board, and the microstructure layer is arranged on a surface of the substrate layer away from the lamp board; the microstructure layer is composed of a plurality of micro-protrusions, at least some of the adjacent micro-protrusions among the plurality of the micro-protrusions have gaps, and a plurality of the micro-protrusions correspond to one light-emitting element, the surface of each of the micro-protrusions is a curved surface, and the sizes of each of the micro-protrusions are randomly distributed.

2. The encapsulation layer according to claim 1, characterized in that The maximum diameter of each of the micro protrusions is randomly distributed between 1 μm and 20 μm, and the maximum height of each of the micro protrusions is randomly distributed between 0.5 μm and 10 μm.

3. The encapsulation layer according to claim 1, characterized in that The substrate layer and each of the micro-protrusions are integrally formed.

4. The encapsulation layer according to claim 1, characterized in that The substrate layer includes a film material layer, and the microstructure layer is a coating layer arranged on a side of the film material layer away from the light panel.

5. The encapsulation layer according to any one of claims 1 to 4, characterized in that: The hardness of each of the micro-protrusions is greater than 1H, and the adhesion of each of the micro-protrusions on the substrate layer is greater than 2B.

6. The encapsulation layer according to any one of claims 1 to 4, characterized in that: The reflectivity of the surface of each of the micro-protrusions is less than 10%.

7. The encapsulation layer according to any one of claims 1 to 4, characterized in that: Some of the micro-protrusions overlap each other, or there are gaps between adjacent micro-protrusions.

8. The encapsulation layer according to any one of claims 1 to 4, characterized in that: The surface of the substrate layer between adjacent micro-protrusions is a plane.

9. The encapsulation layer according to any one of claims 1 to 4, characterized in that: The ratio of the sum of the orthographic projection areas of the micro protrusions within a unit area on the substrate layer to the unit area is 30% to 95%.

10. A display screen, characterized in that: It comprises a lamp board and a packaging layer as described in any one of claims 1 to 9, wherein the packaging layer is arranged on the light emitting side of the lamp board and covers each light emitting element on the lamp board.

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