Display panel and manufacturing method thereof, and display device

Abstract

The present application discloses a display panel and a method for preparing the same, and a display device, which relate to the field of display technology and can improve the light output efficiency of the display panel in the front view direction. The display panel includes a display substrate, a prism layer and a packaging cover plate. The display substrate includes a plurality of sub-pixels, each of which has a light-emitting area. The prism layer is arranged on the light-emitting side of the display substrate, and includes a plurality of mutually separated first medium patterns and a second medium located between the first medium patterns. Among them, the orthographic projection of each first medium pattern on the display substrate covers the orthographic projection of the light-emitting area of ​​at least one sub-pixel on the display substrate, and the refractive index of the first medium pattern is greater than the refractive index of the second medium. The packaging cover plate is arranged on the side of the prism layer away from the display substrate. The present application is used to prepare a display device.

Description

Technical Field

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

[0002] Organic Light-Emitting Diode (OLED) display panels have the characteristics of self-luminescence, high contrast, fast response speed, low power consumption, and ultra-lightness, and therefore have been widely used.

[0003] The display panel includes a plurality of sub-pixels. When the display panel is working, the light emitted by the sub-pixels includes effective light (i.e., light with a smaller angle with the normal direction of the display panel) and divergent light (i.e., light with a larger angle with the normal direction of the display panel). When the human eye looks directly at the display panel, most of the effective light can be received by the human eye, while most of the divergent light will not be received by the human eye. Therefore, improving the light emission efficiency of the display panel in the normal direction is an important research direction for display panels. Summary of the invention

[0004] Embodiments of the present disclosure provide a display panel and a method for manufacturing the same, and a display device, which can improve the light extraction efficiency of the display panel in a normal viewing direction.

[0005] To achieve the above objectives, the embodiments of the present disclosure adopt the following technical solutions:

[0006] On the one hand, an embodiment of the present disclosure provides a display panel. The display panel includes a display substrate, a prism layer and a packaging cover plate. The display substrate includes a plurality of sub-pixels, each of which has a light-emitting area. The prism layer is arranged on the light-emitting side of the display substrate, and includes a plurality of mutually separated first medium patterns and a second medium located between the first medium patterns. The orthographic projection of each first medium pattern on the display substrate covers the orthographic projection of the light-emitting area of ​​at least one sub-pixel on the display substrate, and the refractive index of the first medium pattern is greater than the refractive index of the second medium. The packaging cover plate is arranged on the side of the prism layer away from the display substrate.

[0007] The display panel provided by the embodiment of the present disclosure has a prism layer disposed between the display substrate and the packaging cover plate, and the prism layer includes a first medium pattern and a second medium. The orthographic projection of the first medium pattern on the display substrate covers the orthographic projection of the light-emitting area of ​​at least one sub-pixel on the display substrate, so that the orthographic projection of the interface between the first medium pattern and the second medium on the display substrate is located outside the light-emitting area of ​​the sub-pixel, so that the divergent light emitted by the sub-pixel will be incident on the above-mentioned interface, and in the prism layer, the light is emitted from the first medium pattern to the second medium. The refractive index of the first medium pattern is greater than the refractive index of the second medium, and the light is emitted from the first medium pattern to the second medium, so that the interface between the first medium pattern and the second medium forms a reflective interface, and part of the divergent light emitted to the reflective interface is reflected at the reflective interface, and then passes through the packaging cover plate and is emitted from the front view direction of the display panel, thereby improving the light output efficiency of the display panel in the front view direction.

[0008] In some embodiments, the first dielectric pattern is made of the same material as the package cover plate, and the two are an integral structure.

[0009] In some embodiments, the first dielectric pattern and the package cover plate are made of different materials, and the two are in contact with each other.

[0010] In some embodiments, the material of the first dielectric pattern includes at least one of an organic resin and an optical adhesive.

[0011] In some embodiments, the first medium pattern and the packaging cover plate form a groove, and the second medium is filled in the groove.

[0012] In some embodiments, an angle between a side wall of the first dielectric pattern and a bottom wall of the groove is an obtuse angle or a right angle.

[0013] In some embodiments, there is a gap between the first medium pattern and the display substrate, and the second medium is further filled in the gap.

[0014] In some embodiments, the plurality of sub-pixels are arranged in a plurality of rows and columns, each row includes a plurality of sub-pixels arranged along a first direction, and each column includes a plurality of sub-pixels arranged along a second direction; the first direction intersects the second direction. An orthographic projection of a first medium pattern on the display substrate covers a light-emitting area of ​​a sub-pixel, and an orthographic projection of the groove on the display substrate surrounds the light-emitting area.

[0015] In some embodiments, a plurality of sub-pixels are arranged in a plurality of rows and a plurality of columns, each row includes a plurality of sub-pixels arranged along a first direction, and each column includes a plurality of sub-pixels arranged along a second direction; the first direction intersects the second direction. An orthographic projection of a first dielectric pattern on the display substrate covers the light-emitting area of ​​a row of sub-pixels, and the orthographic projection of the groove on the display substrate is located on both sides of the light-emitting area of ​​a row of sub-pixels along the second direction; or, an orthographic projection of a first dielectric pattern on the display substrate covers the light-emitting area of ​​a column of sub-pixels, and the orthographic projection of the groove on the display substrate is located on both sides of the light-emitting area of ​​a column of sub-pixels along the first direction.

[0016] In some embodiments, the second medium includes nitrogen.

[0017] In some embodiments, the display substrate includes a pixel defining layer. The pixel defining layer has a plurality of openings, and the boundary of each opening defines a light-emitting area of ​​a sub-pixel. The orthographic projection of each first medium pattern on the pixel defining layer covers the boundary of an opening.

[0018] On the other hand, an embodiment of the present disclosure also provides a method for preparing a display panel. The preparation method includes: preparing a display substrate; forming a prism layer and a packaging cover plate on the light-emitting side of the display substrate. The display substrate includes a plurality of sub-pixels, and each sub-pixel has a light-emitting area. The prism layer includes a plurality of mutually separated first medium patterns and a second medium located between the first medium patterns. The orthographic projection of each first medium pattern on the display substrate covers the orthographic projection of the light-emitting area of ​​at least one sub-pixel on the display substrate, and the refractive index of the first medium pattern is greater than the refractive index of the second medium; the packaging cover plate is located on the side of the prism layer away from the display substrate.

[0019] In some embodiments, a prism layer and a packaging cover plate are formed on the light-emitting side of a display substrate, including: forming a first dielectric layer on the light-emitting side of the display substrate; patterning the first dielectric layer to form a plurality of first dielectric patterns; bonding the packaging cover plate disposed on the plurality of first dielectric patterns to the display substrate, and filling a second dielectric in a cavity formed by the packaging cover plate, the plurality of first dielectric patterns and the display substrate.

[0020] In some embodiments, a prism layer and a packaging cover are formed on the light-emitting side of a display substrate, including: providing a substrate; patterning the substrate to form a plurality of first medium patterns on one side of the substrate; using a portion of the substrate other than the plurality of first medium patterns as a packaging cover; bonding the patterned cover to the display substrate, and filling a second medium in a cavity formed by the substrate and the display substrate.

[0021] On the other hand, an embodiment of the present disclosure further provides a display device, comprising the display panel in any of the above embodiments.

[0022] The beneficial effects of the display panel manufacturing method and the display device provided by the above embodiments of the present disclosure can be referred to the beneficial effects of the display panel mentioned above, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual sizes of the products involved in the embodiments of the present disclosure.

[0024] Figure 1 is a structural diagram of a display device according to some embodiments of the present disclosure;

[0025] Figure 2 is a structural diagram of a display substrate according to some embodiments of the present disclosure;

[0026] Figure 3A for Figure 1 A sectional view along section line AA;

[0027] Figure 3B for Figure 1 Another cross-sectional view along section line AA;

[0028] Figure 4A A structural diagram of a display panel according to some embodiments of the present disclosure;

[0029] Figure 4B is another structural diagram of a display panel according to some embodiments of the present disclosure;

[0030] Figure 5A is a top view of a display panel according to some embodiments of the present disclosure;

[0031] Figure 5B is another top view of a display panel according to some embodiments of the present disclosure;

[0032] Fig. 6A A preparation flow chart of a display panel according to some embodiments of the present disclosure;

[0033] Figure 6B Another preparation flow chart of a display panel according to some embodiments of the present disclosure;

[0034] Fig. 7A A diagram of a preparation process of a display panel according to some embodiments of the present disclosure;

[0035] Figure 7BAnother process diagram for preparing a display panel according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0037] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplarily" or "such as" are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0038] In the description of the present disclosure, it is necessary to understand that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", and "horizontal" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0040] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0041] The use of "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0042] Some embodiments of the present disclosure provide a display device 1000, referring to Figure 1 The display device 1000 may be any product or component with a display function, such as a television, a laptop computer, a tablet computer, a mobile phone, a personal digital assistant (PDA), a navigator, a wearable device, an augmented reality (AR) device, a virtual reality (VR) device, etc. The display device 1000 includes a display panel 100.

[0043] The display panel 100 includes a display substrate 110. Figure 2 The display substrate 110 includes a plurality of sub-pixels P, and the sub-pixels P play a role in displaying a picture. Figure 2 , multiple sub-pixels P are arranged in multiple rows and multiple columns. Each row includes multiple sub-pixels P arranged along a first direction X, that is, multiple sub-pixels P arranged along the first direction X are a row of sub-pixels; each column includes multiple sub-pixels P arranged along a second direction Y, that is, multiple sub-pixels P arranged along the second direction Y are a column of sub-pixels. The first direction X intersects the second direction Y. Exemplarily, the first direction X is perpendicular to the second direction Y.

[0044] Each sub-pixel P includes a pixel driving circuit 101 and a light emitting device 102 electrically connected to the pixel driving circuit 101 .

[0045] See also Figure 2 , the display panel 100 further includes a plurality of signal lines. Exemplarily, the display substrate 110 includes a plurality of scanning signal lines GL and data lines DL, etc.; each row of sub-pixels P shares one or more scanning signal lines GL, and each column of sub-pixels P shares one data line DL. The display substrate 110 may further include a gate driving circuit 103, a source driver (Source Driver IC), a circuit board (Source PCB), etc., which are not described one by one here.

[0046] See also Figure 3A, the pixel driving circuit 101 includes a plurality of thin film transistors (TFT) and at least one capacitor Cst. For example, the pixel driving circuit 101 may be a "7T1C" circuit, a "7T2C" circuit, or a "3T1C" circuit, etc. The embodiment of the present disclosure does not specifically limit the structure of the pixel driving circuit 101. In the above, "T" refers to a thin film transistor, and the number before "T" refers to the number of thin film transistors; "C" refers to a capacitor Cst, and the number before "C" refers to the number of capacitors Cst. Among them, Figure 3A Only one TFT and one capacitor Cst are shown exemplarily.

[0047] In some embodiments, the display substrate 110 includes a substrate 10. For example, the substrate 10 may be a rigid substrate. Thus, the display panel 100 is a rigid OLED display panel. The display substrate 110 also includes a barrier layer 11 disposed on the substrate 10. The barrier layer 11 may be composed of multiple layers of inorganic materials.

[0048] Along the direction Z ( Figure 3A In the direction from bottom to top in the middle, the display substrate 110 may further include an active layer 12 (semiconductor layer), a first gate dielectric layer 13, a first gate layer 14, a second gate dielectric layer 15, a second gate layer 16, an interlayer dielectric layer 17, a first source-drain conductive layer 18, a first planarizing layer 19, a second source-drain conductive layer 20, and a second planarizing layer 21, which are sequentially arranged on the side of the barrier layer 11 away from the substrate 10.

[0049] The TFT includes a semiconductor pattern 121 in the active layer 12, a gate 141 in the first gate layer 14, and a source 181 and a drain 182 in the first source-drain conductive layer 18. The capacitor Cst may include a first plate 142 in the first gate layer 14 and a second plate 161 in the second gate layer 16.

[0050] The display substrate 110 further includes an anode layer 22 , a pixel defining layer 23 , a light emitting layer 24 , a spacer layer 25 , and a cathode layer 26 located on a side of the second planar layer 21 away from the substrate 10 .

[0051] The anode layer 22 includes a plurality of mutually separated anodes 221 ( Figure 3A Only one anode 221 is shown in the figure for example. The pixel defining layer 23 has a plurality of openings 231, each of which defines a light-emitting region 23' of a sub-pixel P, and each of which exposes at least a portion of an anode 221. The light-emitting layer 24 includes a plurality of light-emitting function patterns 241, and at least a portion of each light-emitting function pattern 241 is located in an opening 231. The cathode layer 26 can be a whole layer structure. The spacer layer 25 includes a plurality of spacers 251 ( Figure 3A Only one spacer 251 is exemplarily shown in the figure, and the orthographic projection of the spacer 251 on the pixel defining layer 23 is separated from the opening 231. The spacer 251 is used to support the mask plate in the evaporation process.

[0052] The light emitting layer 24 may include one or more of an electron transport layer (ETL), an electron injection layer (EIL), a hole transport layer (HTL) and a hole injection layer (HIL). The cathode layer 26 may be made of a transparent conductive material, such as indium tin oxide (ITO).

[0053] A light emitting device 102 includes an anode 221 , a light emitting function pattern 241 located on the anode 221 , and a portion of the cathode layer 26 contacting the light emitting function pattern 241 .

[0054] It should be understood that the structure of the display substrate 110 may also include other film layers, or only include some of the film layers in the above film layer structure, and the above is only an example of a display substrate 110, rather than the only embodiment of the display substrate 110. For example, the display substrate 110 may also be a bottom-gate display substrate, a dual-gate display substrate, etc., which is not specifically limited in the embodiments of the present disclosure.

[0055] A packaging cover plate 130 is provided on the light-emitting side of the display substrate 110, which is used to package and protect the display substrate 110. When the display panel 100 is working, the light emitted by the sub-pixel P includes effective light and divergent light. Effective light refers to: part of the light that can be received by the human eye when looking directly at the display panel. The angle between the effective light and the normal direction of the display panel 100 (perpendicular to the display panel 100) is within a relatively small angle range, for example, the range of the above angle can be 0° to 20°. Divergent light refers to: part of the light that cannot be received by the human eye when looking directly at the display panel. The angle between the divergent light and the normal direction of the display panel 100 is relatively large, for example, the above angle is 20° to 50°.

[0056] In the related art, the light emitted by the sub-pixel directly enters the packaging cover plate and then exits the display panel through the packaging cover plate, wherein the divergent light cannot be effectively utilized, that is, the light emission efficiency in the normal viewing direction of the display panel is low.

[0057] To solve the above problems, the display panel provided in the embodiment of the present disclosure refers to Figure 3A, further comprising a prism layer 120 located on the light emitting side of the display substrate 110 , and a packaging cover plate 130 located on a side of the prism layer 120 away from the display substrate 110 .

[0058] For example, Figure 3A Taking the top-emitting display panel 100 as an example, the light-emitting side of the display substrate 110 is the side of the light-emitting device 102 away from the pixel driving circuit 101 ( Figure 3A 10 (the upper side of the display substrate 110).

[0059] The prism layer 120 includes a plurality of first dielectric patterns 27 ( Figure 3A Only one first dielectric pattern 27 and a second dielectric 28 located between the plurality of first dielectric patterns 27 are exemplarily shown; that is, the entire area of ​​the prism layer 120 except the plurality of first dielectric patterns 27 is filled with the second dielectric 28 .

[0060] In some embodiments, Figure 4A and Figure 4B As shown, the first dielectric pattern 27 and the encapsulation cover plate 130 form a groove 29, and the second dielectric 28 is filled in the groove 29. That is, the first dielectric pattern 27 protrudes from the encapsulation cover plate 130 toward the side close to the display substrate 110, and forms a groove 29 with the encapsulation cover plate, and the groove 29 is filled with the second dielectric 28. The second dielectric 28 in the groove 29 and the second dielectric pattern 27 together form the prism layer 120.

[0061] In some embodiments, the second medium 28 includes nitrogen. During the manufacturing process of the rigid OLED display panel, the package cover plate 130 and the display substrate 110 need to be bonded and fixed in a nitrogen environment. The second medium 28 uses nitrogen, and no additional materials are needed, which is conducive to reducing the manufacturing difficulty of the display panel 100 and reducing the manufacturing cost of the display panel 100.

[0062] In some other embodiments, the second medium 28 may also be an inert gas, such as helium or other inert gases.

[0063] Among them, see Figure 3A and Figure 4A , the orthographic projection of each first dielectric pattern 27 on the display substrate 110 covers the orthographic projection of the light emitting area 23' of at least one sub-pixel P on the display substrate 110. In this way, the orthographic projection of the interface between the first dielectric pattern 27 and the second dielectric 28 (the side wall 271 of the first dielectric pattern 27) on the display substrate 110 can be located outside the light emitting area 23' of the sub-pixel P, so that part of the divergent light emitted by the sub-pixel P will be incident on the above-mentioned interface, and in the prism layer 120, the light is emitted from the first dielectric pattern 27 to the second dielectric 28.

[0064] The refractive index of the first medium pattern 27 is greater than the refractive index of the second medium 28. Figure 4A , Figure 4A is a cross-sectional view of the display panel 100, and Figure 4A Only a partial structure of a plurality of sub-pixels P (three) is shown.

[0065] The light emitted by the sub-pixel P is emitted from the first dielectric pattern 27 to the second dielectric 28, and the refractive index of the first dielectric pattern 27 is greater than the refractive index of the second dielectric 28, so that the interface between the first dielectric pattern 27 and the second dielectric 28 forms a reflective interface (the side wall 271 of the first dielectric pattern 27). Figure 4A As shown, part of the light directed toward the reflective interface is reflected at the reflective interface and then emitted from the front view direction of the display panel 100 through the packaging cover plate 130, thereby improving the light extraction efficiency of the display panel in the front view direction.

[0066] Exemplarily, the refractive index of the first medium pattern 27 is N1, and the refractive index of the second medium is N2. When the incident angle of the light irradiated onto the reflective interface is greater than sin-1N1 / N2, the light is totally reflected at the reflective interface, and at least part of the totally reflected light can be emitted from the forward direction of the sub-pixel P, thereby increasing the light output efficiency of the display panel 100 in the forward direction.

[0067] Exemplarily, when the first dielectric pattern 27 is glass and the second dielectric is nitrogen, when the incident angle of the light irradiated to the interface between the first dielectric pattern 27 and the second dielectric 28 is greater than 41.8°, the light may be totally reflected.

[0068] Exemplarily, when the material of the first dielectric pattern 27 includes optically clear adhesive (OCA) and the second dielectric is nitrogen, when the incident angle of the light irradiated to the interface between the first dielectric pattern 27 and the second dielectric 28 is greater than 42.9°, the light can be totally reflected.

[0069] In some embodiments, see Figure 3B and Figure 4B , the first dielectric pattern 27 can be made of the same material as the package cover plate 130, and the two are an integrated structure. That is, the package cover plate 130 includes a cover plate body 131 and a plurality of protrusions 132 disposed on the side of the cover plate body 131 close to the display substrate 110, each protrusion 132 forms a first dielectric pattern 27, and the orthographic projection of each protrusion 132 on the display substrate 110 covers the light-emitting area 23' of a sub-pixel P. The package cover plate 130 and the first dielectric pattern 27 are an integrated structure, which can prevent the propagation direction of light from changing when propagating between the first dielectric pattern 27 and the package cover plate 130.

[0070] In some embodiments, see Figure 3A and Figure 4A The first dielectric pattern 27 and the package cover plate 130 are made of different materials and are in contact with each other. In this way, the difficulty of manufacturing the package cover plate 130 can be reduced.

[0071] The orthographic projection of the spacer 251 on the pixel defining layer 23 is separated from the opening 231, and there is a gap between the encapsulation cover plate 130 and the display substrate 110 at the light emitting area 23' of the sub-pixel P. The first dielectric pattern 27 is disposed on the side of the light emitting area 23' away from the substrate 10. When the thickness (dimension along the third direction Z) of the first dielectric pattern 27 is smaller than the size of the gap, the first dielectric pattern 27 is in direct contact with the encapsulation cover plate 130, which can avoid the second dielectric being filled between the first dielectric pattern 27 and the encapsulation cover plate 130, and avoid the light from being reflected on the surface of the first dielectric pattern 27 close to the encapsulation cover plate 130, thereby improving the forward light extraction efficiency of the display panel 100.

[0072] For example, a plurality of first dielectric patterns 27 may be formed on the encapsulation cover plate 130 first, and then the encapsulation cover plate 130 and the first dielectric patterns 27 may be bonded and fixed to the display substrate 110 (see S200 below).

[0073] In some embodiments, the first dielectric pattern 27 may also contact the display substrate 110 , that is, the first dielectric pattern 27 contacts the display substrate 110 at a side close to the display substrate 110 and contacts the package cover plate 130 at a side close to the package cover plate 130 .

[0074] In some embodiments, the material of the package cover plate 130 may be glass, and the material of the first dielectric pattern 27 may include at least one of organic resin and optically clear adhesive (OCA). That is, the material of the first dielectric pattern 27 may include organic resin, optical adhesive, or organic resin and optical adhesive.

[0075] For example, the material of the first dielectric pattern 27 can be optical glue, which has a high light transmittance (for example, greater than 99%), and the refractive index of the optical glue (approximately 1.47) is slightly different from the refractive index of the packaging cover plate 130 (glass) (approximately 1.5), so the propagation direction of the light changes little at the interface between the two.

[0076] In some embodiments, there is a gap D1 between the first dielectric pattern 27 and the display substrate 110, and the second dielectric 28 is also filled in the gap D1. Part of the divergent light is refracted on the surface of the first dielectric pattern 27 close to the display substrate 110, and the angle α between the propagation direction of the light and the direction perpendicular to the display panel 100 becomes smaller, that is, the light is refracted on the surface of the first dielectric pattern 27 close to the display substrate 110 (not shown in the figure), which is conducive to the light being emitted from the forward direction of the display panel 100, thereby improving the light extraction efficiency of the display panel 100 in the forward direction. The gap D1 is interconnected with the groove 29, and the same medium is filled in both to facilitate the manufacture of the display panel 110.

[0077] In some embodiments, the angle β between the sidewall 271 of the first dielectric pattern 27 and the bottom wall 291 of the groove 29 is an obtuse angle; or, the angle β between the sidewall 271 of the first dielectric pattern 27 and the bottom wall 291 of the groove 29 is a right angle.

[0078] Exemplarily, the angle β between the side wall 271 of the first dielectric pattern 27 and the bottom wall 291 of the groove 29 is an obtuse angle, which is conducive to increasing the incident angle θ of the light irradiated to the side wall 271, which is conducive to the total reflection of the light on the reflection interface, further increasing the proportion of the reflected light in the divergent light, and increasing the light extraction efficiency in the normal viewing direction of the display panel 100. At the same time, the incident angle γ of the light emitted from the packaging cover plate 130 can be reduced, reducing the possibility of light being reflected at the interface between the packaging cover plate 130 and the outside world, and further improving the light extraction efficiency of the display panel 100.

[0079] Exemplarily, the angle β between the sidewall 271 of the first dielectric pattern 27 and the bottom wall 291 of the groove 29 is a right angle. After being reflected on the reflective interface, the divergent light can propagate in a direction away from the display substrate 110 and then be emitted through the package cover plate 130 .

[0080] In some embodiments, Figure 5A As shown, the orthographic projection of a first medium pattern 27 on the display substrate 110 covers the light-emitting area 23' of a sub-pixel P, and the orthographic projection of the groove 29 on the display substrate 110 surrounds the light-emitting area 23'. In this way, the area of ​​the interface between the first medium pattern 27 and the second medium 28 can be increased, and the amount of light emitted from the sub-pixel P to the above-mentioned interface can be increased, and the light emitted from the display panel 100 in the normal viewing direction after being reflected by the above-mentioned interface can be increased, thereby improving the light output rate of the display panel 100 in the normal viewing direction.

[0081] In some embodiments, the orthographic projection of a first dielectric pattern 27 on the display substrate 110 covers the light-emitting area 23' of a row of sub-pixels P, and the orthographic projection of the groove 29 on the display substrate 110 is located on both sides of the light-emitting area 23' of a row of sub-pixels P along the second direction Y. Alternatively, Figure 5B As shown, the orthographic projection of a first dielectric pattern 27 on the display substrate 110 covers the light-emitting area 23' of a column of sub-pixels P, and the orthographic projection of the groove 29 on the display substrate 110 is located on both sides of the light-emitting area 23' of a column of sub-pixels P along the first direction X. In this way, the pattern of the prism layer 120 can be simplified, the difficulty of manufacturing the first dielectric pattern 27 can be reduced, and the manufacturing efficiency of the display panel 100 can be improved. Among them, Figure 5B An example is taken in which the orthographic projection of a first dielectric pattern 27 on the display substrate 110 covers the light emitting area 23 ′ of a column of sub-pixels P.

[0082] Some embodiments of the present disclosure further provide a method for preparing a display panel 100, which is used to prepare the display panel described in any of the above embodiments. The preparation method includes S100 to S200.

[0083] S100 , preparing a display substrate 110 .

[0084] The display substrate 110 includes a plurality of sub-pixels P, each of which has a light-emitting region 23'. Figure 3A As shown, the structure of the display substrate 110 is described above and will not be repeated here.

[0085] S200 , forming a prism layer 120 and a packaging cover plate 130 on the light-emitting side of the display substrate 110 .

[0086] The prism layer 120 includes a plurality of mutually separated first dielectric patterns 27 and a second dielectric 28 located between the first dielectric patterns 27. The orthographic projection of each first dielectric pattern 27 on the display substrate 110 covers the orthographic projection of the light emitting area 23' of at least one sub-pixel P on the display substrate 110, and the refractive index of the first dielectric pattern 27 is greater than the refractive index of the second dielectric 28; the encapsulation cover plate 130 is located on a side of the prism layer 120 away from the display substrate 110.

[0087] In some embodiments, the first dielectric pattern 27 and the package cover plate 130 are made of different materials, and the first dielectric pattern is in contact with the package cover plate 130. Fig. 6A and Fig. 7A , S200 includes S210~240.

[0088] S210 , providing a packaging cover plate 130 .

[0089] Exemplarily, the package cover plate 130 may be a glass cover plate.

[0090] S220 , forming a first dielectric layer 27 ′ on one side of the package cover plate 130 .

[0091] Exemplarily, the first dielectric layer 27' may be formed by a coating process. The material of the first dielectric layer may include at least one of an organic resin and an optical adhesive layer. For example, the material of the first dielectric layer may include an optical adhesive.

[0092] S230 , patterning the first dielectric layer 27 ′ to form a plurality of first dielectric patterns 27 .

[0093] For example, the first dielectric layer 27 ′ may be patterned by exposure and development processes.

[0094] S240 , bonding the packaging cover plate 130 provided with a plurality of first dielectric patterns 27 to the display substrate 110 , and filling a second dielectric 28 in a cavity formed by the packaging cover plate 130 , the plurality of first dielectric patterns 27 and the display substrate 110 .

[0095] Exemplarily, the encapsulation cover plate 130 and the plurality of first medium patterns 27 are bonded to the display substrate 110 in an environment including the second medium 28. The rigid OLED display panel is usually encapsulated in a nitrogen (second medium 28) environment, which can reduce the possibility of oxygen entering the display panel 100, reduce the risk of oxidation inside the display panel, and thus increase the service life of the display panel 100.

[0096] During the bonding process of the package cover plate 130 and the plurality of first dielectric patterns 27 to the display substrate 110, the cavity formed by the package cover plate 130, the plurality of first dielectric patterns 27 and the display substrate 110 is filled with the second dielectric 28. Thus, the second dielectric 28 is also filled between the plurality of first dielectric patterns 27, and the second dielectric 28 and the plurality of first dielectric patterns 27 together form the prism layer 120.

[0097] The plurality of first dielectric patterns 27 are closer to the display substrate 110 than the packaging cover plate 130 , and the orthographic projection of each first dielectric pattern 27 on the display substrate 110 covers the light emitting area of ​​at least one sub-pixel P.

[0098] Exemplarily, the package cover plate 130 and the display substrate 110 may be bonded and fixed by glass frit 140; for example, glass frit may be directly disposed on the package cover plate 130 and the display substrate 110, and then the glass frit may be melted by laser to bond and fix the package cover plate 130 and the display substrate 110. The glass frit 140 is disposed along the circumference of the display panel 100, and the glass frit 140 may also seal the side of the display panel 100, thereby reducing the risk of the second medium 28 (nitrogen) overflowing from the side wall of the display panel 100, and reducing the risk of external air and moisture intruding into the display panel 100, which is beneficial to improving the service life of the display panel 100.

[0099] In some embodiments, the first dielectric pattern 27 is made of the same material as the package cover plate 130, and the two are an integral structure. Figure 6B and Figure 7B , S200 includes S201~203.

[0100] S201, providing a substrate 130'.

[0101] The packaging substrate 130 ′ may be a glass substrate.

[0102] S202 , patterning the packaging substrate 130 ′ to form a packaging cover plate 130 .

[0103] Illustratively, S202 , patterning the package substrate 130 ′ may include S2021 ˜ S2023 .

[0104] S2021, coating photoresist PR on the packaging substrate 130'.

[0105] S2022, using a mask to expose a portion of the photoresist PR, and removing the exposed portion of the photoresist PR.

[0106] S2023 , etching the packaging substrate 130 ′ by using hydrogen fluoride to form a packaging cover plate 130 .

[0107] The packaging cover plate 130 includes a cover plate body 131 and a plurality of protrusions 132 located on the cover plate body 131 . Each protrusion 132 forms a first medium pattern 27 . There are grooves 29 between the plurality of protrusions 27 .

[0108] S203 , bonding the patterned substrate 130 ′ to the display substrate 110 , and filling the second medium 28 in the cavity formed by the substrate 130 ′ and the display substrate 110 .

[0109] Exemplarily, the encapsulation cover plate 130 and the plurality of first medium patterns 27 are bonded to the display substrate 110 in an environment including the second medium 28 .

[0110] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0111] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: A display substrate including a plurality of sub-pixels, each sub-pixel having a light-emitting region; A prism layer, arranged on the light-emitting side of the display substrate, comprising a plurality of mutually separated first medium patterns and a second medium located between the first medium patterns; wherein the orthographic projection of each first medium pattern on the display substrate covers the orthographic projection of the light-emitting area of ​​at least one sub-pixel on the display substrate, and the refractive index of the first medium pattern is greater than the refractive index of the second medium; A packaging cover plate, disposed on a side of the prism layer away from the display substrate; The first medium pattern and the packaging cover plate form a groove, and the second medium is filled in the groove; there is a gap between the first medium pattern and the display substrate, and the second medium is also filled in the gap.

2. The display panel according to claim 1, characterized in that: The first dielectric pattern and the packaging cover plate are made of the same material, and the two are an integrated structure.

3. The display panel according to claim 1, characterized in that: The first dielectric pattern and the packaging cover plate are made of different materials, and the two are in contact with each other.

4. The display panel according to claim 3, characterized in that: The material of the first dielectric pattern includes at least one of organic resin and optical glue.

5. The display panel according to claim 1, characterized in that: The included angle between the side wall of the first dielectric pattern and the bottom wall of the groove is an obtuse angle or a right angle.

6. The display panel according to claim 1, characterized in that: The plurality of sub-pixels are arranged in a plurality of rows and a plurality of columns, each row includes a plurality of sub-pixels arranged along a first direction, and each column includes a plurality of sub-pixels arranged along a second direction; the first direction intersects the second direction; An orthographic projection of a first medium pattern on the display substrate covers a light-emitting area of ​​the sub-pixel, and an orthographic projection of the groove on the display substrate surrounds the light-emitting area.

7. The display panel according to claim 1, characterized in that: The plurality of sub-pixels are arranged in a plurality of rows and a plurality of columns, each row includes a plurality of sub-pixels arranged along a first direction, and each column includes a plurality of sub-pixels arranged along a second direction; the first direction intersects the second direction; An orthographic projection of a first dielectric pattern on the display substrate covers the light-emitting area of ​​a row of sub-pixels, and the orthographic projection of the groove on the display substrate is located on both sides of the light-emitting area of ​​the row of sub-pixels along the second direction; or, An orthographic projection of a first medium pattern on the display substrate covers a light-emitting area of ​​a column of sub-pixels, and an orthographic projection of the groove on the display substrate is located on both sides of the light-emitting area of ​​the column of sub-pixels along a first direction.

8. The display panel according to any one of claims 1 to 4, characterized in that: The second medium includes nitrogen.

9. The display panel according to any one of claims 1 to 4, characterized in that: The display substrate comprises: A pixel defining layer having a plurality of openings, wherein the boundary of each opening defines a light emitting area of ​​a sub-pixel; The orthographic projection of each first medium pattern on the pixel defining layer covers a boundary of an opening.

10. A method for preparing a display panel, characterized in that: Used to prepare a display panel according to any one of claims 1 to 9, the preparation method comprising: Prepare a display substrate; the display substrate includes a plurality of sub-pixels, each sub-pixel having a light-emitting area; A prism layer and a packaging cover are formed on the light-emitting side of the display substrate; the prism layer includes a plurality of first medium patterns separated from each other and a second medium located between the first medium patterns; wherein the orthographic projection of each first medium pattern on the display substrate covers the orthographic projection of the light-emitting area of ​​at least one sub-pixel on the display substrate, and the refractive index of the first medium pattern is greater than the refractive index of the second medium; the packaging cover is located on the side of the prism layer away from the display substrate.

11. The preparation method according to claim 10, characterized in that: A prism layer and a packaging cover plate are formed on the light-emitting side of the display substrate, including: Providing a packaging cover plate; forming a first dielectric layer on one side of the packaging cover plate; patterning the first dielectric layer to form a plurality of first dielectric patterns; The packaging cover plate provided with the plurality of first medium patterns is bonded to the display substrate, and a second medium is filled in a cavity formed by the packaging cover plate, the plurality of first medium patterns and the display substrate.

12. The preparation method according to claim 10, characterized in that: A prism layer and a packaging cover plate are formed on the light-emitting side of the display substrate, including: providing a substrate; Patterning the substrate to form a plurality of first dielectric patterns on one side of the substrate; a portion of the substrate other than the plurality of first dielectric patterns serves as the packaging cover plate; The patterned substrate is bonded to the display substrate, and the second medium is filled in the cavity formed by the substrate and the display substrate.

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

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