Display panel and preparation method thereof

Abstract

The invention provides a display panel and a preparation method thereof, is applied to the technical field of display, and aims to improve the light extraction rate of the display panel. The pixel definition layer is located on the substrate and comprises a plurality of openings, and light-emitting devices are contained in the openings; the packaging layer is located on the side, away from the substrate, of the pixel defining layer; the reflection structure is located between the packaging layer and the pixel definition layer; wherein one surface, deviating from the pixel definition layer, of the reflection structure comprises a reflection surface, and the reflection surface is configured to reflect light incident from one side, deviating from the pixel definition layer, of the packaging layer.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a method for preparing the same. Background Art

[0002] Organic light-emitting devices, namely organic light-emitting diodes (OLEDs), have the advantages of active luminescence, wide viewing angle, fast response speed, light weight, adjustable color, and flexibility. They have broad application prospects in display, lighting and other fields and have attracted widespread attention.

[0003] However, currently most of the light from OLED devices is lost and cannot be emitted into the air, which makes the luminous efficiency of OLED devices low. Summary of the invention

[0004] Based on the background technology, the present disclosure proposes a display panel and a method for manufacturing the same.

[0005] In a first aspect of the present disclosure, a display panel is provided, comprising:

[0006] substrate;

[0007] A pixel definition layer, located on the substrate, comprising a plurality of openings, wherein the openings accommodate light emitting devices;

[0008] An encapsulation layer, located on a side of the pixel definition layer away from the substrate;

[0009] and, a reflective structure located between the encapsulation layer and the pixel definition layer;

[0010] Wherein, a side of the reflective structure away from the pixel definition layer comprises a reflective surface, and the reflective surface is configured to reflect light incident from a side of the encapsulation layer away from the pixel definition layer.

[0011] Optionally, the orthographic projection of the reflective structure on the substrate is located within the orthographic projection of the pixel definition layer on the substrate, and has no overlap with the orthographic projection of the opening on the substrate.

[0012] Optionally, in a direction parallel to the substrate, a vertical distance between the reflecting surface and the substrate increases linearly or nonlinearly.

[0013] Optionally, the display panel comprises a display area, a plurality of sub-pixels are arranged in an array in the display area, each of the sub-pixels comprises a light-emitting device located in the opening, and a non-light-emitting area is included between two adjacent sub-pixels;

[0014] Wherein, the non-luminous area includes one or more of the reflective structures.

[0015] Optionally, the orthographic projection of the reflective structure on a target plane is a right triangle or a right trapezoid, and the target plane is a plane parallel to the normal line of the substrate;

[0016] Wherein, the reflecting surface is the surface where the hypotenuse of the right triangle or the right trapezoid is located.

[0017] Optionally, when the non-luminous area includes a plurality of the reflective structures, the reflective surfaces of the plurality of reflective structures are parallel, or,

[0018] Among the plurality of the reflective structures, the vertical distance between the reflective surface of some reflective structures and the substrate increases linearly in the target direction, and the vertical distance between the reflective surface of another portion of the reflective structures and the substrate decreases linearly in the target direction;

[0019] Wherein, the target direction is a direction parallel to the substrate.

[0020] Optionally, the reflective structure includes a base, and a reflective layer located on a side of the base facing away from the substrate, and the reflective surface is located on the reflective layer.

[0021] Optionally, an angle between the reflective surface and a surface of the substrate on a side close to the pixel definition layer is smaller than a critical angle at which light is totally reflected on a surface of the encapsulation layer on a side away from the substrate.

[0022] Optionally, the reflective layer is made of a material selected from silver and aluminum, and the thickness of the reflective layer is

[0023] A second aspect of the present disclosure provides a method for preparing a display panel, which is applied to the display panel according to the first aspect, and the method comprises:

[0024] providing a substrate;

[0025] forming a pixel definition layer on one side of the substrate;

[0026] Opening the pixel definition layer and forming a light emitting device in the opening;

[0027] forming a reflective structure on a side of the pixel definition layer facing away from the substrate;

[0028] An encapsulation layer is formed on the side of the reflective structure away from the substrate to obtain the display panel; wherein the side of the reflective structure away from the pixel definition layer includes a reflective surface, and the reflective surface is configured to reflect light incident from the side of the encapsulation layer away from the pixel definition layer.

[0029] The display panel provided by the present disclosure includes: a substrate; a pixel definition layer, located on the substrate, including a plurality of openings, wherein the openings contain light-emitting devices; an encapsulation layer, located on a side of the pixel definition layer away from the substrate; and a reflection surface located between the encapsulation layer and the pixel definition layer, wherein the reflection surface is configured to reflect light incident from a side of the encapsulation layer away from the pixel definition layer;

[0030] Therefore, the present disclosure sets a reflective surface between the pixel definition layer and the encapsulation layer, so that when the light emitted by the light-emitting device is reflected on the side of the encapsulation layer away from the substrate, the light path can be changed through the reflective surface to make it emerge, thereby improving the light extraction rate of the display panel.

[0031] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0033] Figure 1 A schematic diagram of the light path in a display panel in the related art is shown;

[0034] Figure 2 A schematic diagram showing the structure of a display panel provided by an embodiment of the present disclosure is shown;

[0035] Figure 3 Shows Figure 2 A top view of the display panel shown;

[0036] Figure 4 A schematic structural diagram of a display panel provided by another embodiment of the present disclosure is shown;

[0037] Figure 5 A schematic diagram showing the structure of a display panel provided by another embodiment of the present disclosure is shown;

[0038] Figure 6 A schematic diagram of the structure of a display panel provided in Example 3 of the present disclosure is shown;

[0039] Figure 7 A schematic diagram of the structure of a display panel provided by Example 4 of the present disclosure is shown;

[0040] Figure 8 A spectrum diagram of red light emitted by a display panel provided by Example 1 of the present disclosure and a display panel in related technologies is shown;

[0041] Fig. 9 A spectrum diagram of green light emitted by a display panel provided by Example 1 of the present disclosure and a display panel in related technologies is shown;

[0042] Fig.10 A spectrum diagram of blue light emitted by a display panel provided by Example 1 of the present disclosure and a display panel in related technologies is shown;

[0043] Fig.11 A flowchart showing the steps of a method for preparing a display panel provided by an embodiment of the present disclosure is shown;

[0044] Description of reference numerals:

[0045] 10. Substrate; 20. Pixel definition layer; 21. Opening; 22. Light-emitting device; 30. Encapsulation layer; 40. Reflection structure; 41. Reflection surface; 42. Base; 43. Reflection layer. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in 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.

[0047] Reference Figure 1 , Figure 1 FIG. 1 shows a schematic diagram of the optical path in a display panel in the related art. Figure 1 As shown, since the refractive index of the transparent electrode (here, the transparent electrode represents multiple functional layers of the light-emitting device) is about 1.8 to 2.1, the refractive index of the cover plate is about 1.5, and the refractive index of the air is 1, during the emission process, the light is always emitted from the film layer with a high refractive index to the film layer with a low refractive index. In this case, part of the light emitted from the light-emitting device is reflected at the interface and is confined inside the display panel, which makes it difficult for part of the light emitted by the light-emitting device to be emitted into the air, resulting in a low light extraction rate of the display panel. As a result, the luminous efficiency of the display panel is low.

[0048] In view of this, the present disclosure proposes a display panel, which improves the light extraction rate of the display panel by setting a reflective surface between the pixel definition layer and the encapsulation layer in the display panel, reflecting the reflected light at the interface of the encapsulation layer through the reflective surface, changing its optical path so that the reflected light can be emitted from the encapsulation layer.

[0049] Reference Figure 2 , Figure 2 FIG. 4 shows a schematic diagram of the structure of a display panel provided by an embodiment of the present disclosure. Figure 2 As shown, the display panel specifically includes:

[0050] Substrate 10;

[0051] The pixel definition layer 20 is located on the substrate 10 and includes a plurality of openings 21 , wherein the openings 21 accommodate light emitting devices 22 ;

[0052] The encapsulation layer 30 is located on a side of the pixel definition layer 20 facing away from the substrate 10;

[0053] and, a reflective structure 40 located between the encapsulation layer 30 and the pixel definition layer 20;

[0054] The side of the reflective structure 40 facing away from the pixel definition layer 20 includes a reflective surface 41 , and the reflective surface 41 is configured to reflect light incident from the side of the encapsulation layer 30 facing away from the pixel definition layer 20 .

[0055] In the present embodiment, the light emitting device 22 emits light in the direction of the encapsulation layer 30. After passing through the encapsulation layer 30, the light is emitted from the cover plate of the display panel. In this process, since the refractive index of the encapsulation layer 30 is greater than the refractive index of the cover plate, the light is reflected at the interface where the encapsulation layer 30 and the cover plate are in contact. Since the reflective surface 41 reflects the light incident on the side of the encapsulation layer 30 away from the pixel definition layer 20, the light reflected by the cover plate can be reflected back to the cover plate through the reflective surface 41, so that the light originally retained in the display panel can be emitted, thereby improving the light extraction rate of the display panel.

[0056] Among them, the reflective structure 40 can be located on the surface of the pixel definition layer 20 away from the substrate 10, and the reflective surface 41 faces the encapsulation layer 30, so that the reflective surface 41 can reflect the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20; wherein, the reflective surface 41 is made of a material with a high reflectivity, such as silver, aluminum and other metals with a high reflectivity, and silicon dioxide and other non-metallic materials with a high reflectivity. By reflecting the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20 by the reflective surface 41 made of a material with a high reflectivity, the incident light can be reduced from passing through the reflective surface 41 or being refracted at the reflective surface 41, thereby improving the light extraction rate.

[0057] It can be understood that the surface of the side of the encapsulation layer 30 away from the pixel definition layer 20 is a horizontal plane. If the reflection surface 41 is also a horizontal plane, the incident angle of the light reflected by the reflection surface 41 will not change when it re-enters the surface of the side of the encapsulation layer 30 away from the pixel definition layer 20. In this case, it is still difficult for the light to be emitted from the surface of the side of the encapsulation layer 30 away from the pixel definition layer 30. Therefore, the reflection surface 41 can be adjusted to have a certain angle relative to the horizontal plane. In this way, the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20, after being reflected by the reflection surface 41, changes the angle between it and the side of the encapsulation layer 30 away from the pixel definition layer 20, so that the light can be emitted from the side of the encapsulation layer 30 away from the pixel definition layer 20 to the cover plate, so that the light originally retained in the display panel can be emitted.

[0058] Specifically, the reflective structure 40 may be a structure including an inclined surface or an arc surface, so that the reflective surface 41 changes the angle between the emitted light and the surface of the side of the encapsulation layer 30 away from the pixel definition layer 20, so that it can be emitted. For example, the reflective structure 40 may be wedge-shaped.

[0059] The substrate 10 is an OLED (Organic Light-Emitting Diode) substrate, which can be a flexible substrate or a rigid substrate. The substrate 10 can be made of glass, metal, etc. The pixel definition layer 20 is divided into a plurality of spaced segments by a plurality of openings 21. Each opening 21 will accommodate a light emitting device 22. The pixel definition layer 20 limits the light emission of the light emitting device 22 to define the position and light emission of the pixel.

[0060] In one example, the encapsulation layer 30 can be an inorganic encapsulation layer, an organic encapsulation layer, or an inorganic-organic composite encapsulation layer. When the encapsulation layer 30 is an inorganic-organic composite encapsulation layer, the reflective structure 40 can be placed between the inorganic film layer and the organic encapsulation layer to avoid the situation where the reflective surface 41 is affected by the inorganic film layer, making it difficult to reflect light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20.

[0061] The display panel provided by the embodiment of the present disclosure sets a reflective structure 40 between the encapsulation layer 30 and the pixel definition layer 20, and uses the reflective surface 41 of the reflective structure 40 to reflect the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20. In this way, when the light emitted by the light-emitting device 22 is reflected at the contact surface between the cover plate and the encapsulation layer 30 and incident again from the side of the encapsulation layer 30 away from the pixel definition layer 20, it can be reflected by the reflective surface 41 and emitted from the cover plate, thereby improving the light extraction rate of the display panel.

[0062] In one embodiment, referring to Figure 2 and Figure 3 ,in, Figure 3 FIG. 4 shows a top view of a display panel in an embodiment of the present disclosure. Figure 2 and Figure 3 As shown, the orthographic projection of the reflective structure 40 on the substrate 10 is located within the orthographic projection of the pixel definition layer 20 on the substrate 10 , and has no overlap with the orthographic projection of the opening 21 on the substrate 10 .

[0063] Specifically, the orthographic projection of the pixel definition layer 20 on the substrate 10 covers the substrate 10, wherein the openings 21 are arranged in an array, the openings 21 include light-emitting devices 22, and the orthographic projection of the reflective structure 40 on the substrate 10 does not overlap with the orthographic projection of the openings 21 on the substrate 10. In this way, the reflective structure 40 will not block the light emitted by the light-emitting device 22, thereby avoiding the reflective structure 40 blocking the light, resulting in low luminous efficiency of the display panel.

[0064] Among them, the reflective structure 40 can be located on one side of the opening 21, or in various directions of the opening 21. For example, when the light emitting direction of the light emitting device 22 is inclined toward the right side of the opening 21, the reflective structure 40 can be set on the right side of the opening 21; when the light emitting direction of the light emitting device 22 is inclined toward the left side of the opening 21, the reflective structure 40 can be set on the left side of the opening 21; and if the light emitting direction of the light emitting device 22 includes multiple directions, the reflective structure 40 can be set on the left and right sides of the opening 21. In this way, it is convenient to face the reflective surface 41 to the light reflected by the cover plate after the light is emitted by the light emitting device 22, so as to reflect the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20 after reflection to the cover plate as much as possible, thereby improving the light extraction rate of the display panel.

[0065] In one embodiment, continue to refer to Figure 2 , in a direction parallel to the substrate 10 , the vertical distance between the reflecting surface 41 and the substrate 10 increases linearly or nonlinearly.

[0066] It can be understood that the inclination direction of the reflective surface 41 is related to the light emitting direction of the light emitting device 22. When the light emitting device 22 is inclined toward the side of the opening 21, the reflective surface 41 is inclined toward the light emitting direction, so that when the light emitted by the light emitting device 22 is reflected, the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20 can be received. Figure 2 For example, when the light emitted by the light emitting device is inclined toward the direction of the coordinate axis x, the vertical distance between the reflective surface 41 and the substrate 10 gradually increases along the direction indicated by the x-axis.

[0067] The vertical distance between the reflection surface 41 and the substrate 10 may increase linearly or nonlinearly.

[0068] Specifically, when the vertical distance between the reflecting surface 41 and the substrate 10 increases linearly, the reflecting surface 41 can be an inclined surface, and the slope of the inclined surface can be determined according to the exit angle of the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20 on the reflecting surface 41, so that the incident angle of the emitted light at the interface between the encapsulation layer 30 and the cover plate is smaller than the critical angle of reflection between the cover plate and the encapsulation layer 30, so that the reflected light can be incident from the encapsulation layer 30 to the cover plate and then emitted from the display panel.

[0069] When the vertical distance between the reflecting surface 41 and the substrate 10 increases nonlinearly, the reflecting surface 41 can be an arc surface, or a surface composed of an inclined surface, an arc surface, etc., or a step surface, etc., which can reflect the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20 and make it emerge from the display panel.

[0070] In one embodiment, referring to Figure 3 and Figure 4 , Figure 4 A structural diagram of another embodiment of the present disclosure is shown. Figure 3 and Figure 4 As shown, the display panel includes a display area A, in which a plurality of sub-pixels are arranged in an array, each sub-pixel includes a light-emitting device 22 located in an opening 21, and a non-light-emitting area L is included between two adjacent sub-pixels;

[0071] The non-luminous area L includes one or more reflective structures 40 .

[0072] In the present embodiment, light emission is realized at the positions where the sub-pixels arranged in an array in the display area A are located, and each sub-pixel includes a light-emitting device 22 located in the opening 21, and a non-luminous area L is included between each two adjacent sub-pixels, and the area includes a pixel definition layer 20. In this way, the position and light emission of each sub-pixel can be defined, and one or more reflective structures 40 can be set on the surface of the pixel definition layer 20.

[0073] In which, when the non-luminous area L includes a reflective structure 40, the size of the reflective structure 40 in a direction parallel to the substrate 10 can be equal to the size of the pixel definition layer 20 in the non-luminous area L in a direction parallel to the substrate 10, so as to reflect as much light as possible incident from the side of the encapsulation layer 30 away from the pixel definition layer 20; the size of the reflective structure 40 in a direction parallel to the substrate 10 can be smaller than the size of the pixel definition layer 20 in the non-luminous area L in a direction parallel to the substrate 10, so that the reflective structure 40 can be avoided from blocking the light output of the light-emitting device 22, thereby avoiding a reduction in the luminous efficiency of the display panel due to the blocking of the reflective structure 40.

[0074] In the case where the non-luminous region L includes a plurality of reflective structures 40, the plurality of reflective structures 40 may be the same or different. If the plurality of reflective structures 40 are the same, the size of each reflective structure 40 in a direction parallel to the substrate 10 may be determined according to the number of each reflective structure 40, so that the sum of the sizes of the plurality of reflective structures 40 in a direction parallel to the substrate 10 is less than or equal to the size of the pixel definition layer 20 in the non-luminous region L in a direction parallel to the substrate 10, so as to avoid that some of the plurality of reflective structures 40 exceed the non-luminous region L and affect the light emission of the light-emitting device 22. If the plurality of reflective structures 40 are different, the plurality of reflective structures 40 are similar, so that the plurality of reflective structures 40 can all reflect the light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20.

[0075] In one example, refer to Figure 4 and Figure 5 ,in, Figure 5 FIG. 4 shows a schematic diagram of the structure of a display panel provided by another embodiment of the present disclosure. Figure 4 and Figure 5 As shown, in the case where the non-luminous region L includes a plurality of reflective structures 40, the reflective surfaces 41 of the plurality of reflective structures 40 are parallel, or,

[0076] Among the multiple reflective structures 40, the vertical distance between the reflective surface 41 of some reflective structures 40 and the substrate 10 increases linearly in the target direction, and the vertical distance between the reflective surface 41 of another part of the reflective structures 40 and the substrate 10 decreases linearly in the target direction;

[0077] The target direction is parallel to the substrate 10. Figure 4 For example, the target direction is the direction indicated by the coordinate axis x-axis.

[0078] Specifically, in one case, the light emitting device 22 emits light from one side. Figure 4 The reflective surface 41 of each reflective structure 40 faces one side, and the multiple reflective surfaces 41 are parallel. In this way, the light reflected by the reflective surface 41 can be emitted from the display panel at the same angle, so as to avoid the problem of uneven display brightness caused by different angles of the light emitted from the display panel after being reflected.

[0079] In another case, the light emitting device 22 emits light on both sides. Figure 5The multiple reflective structures 40 include two parts. The vertical distance between the reflective surface 41 of one part of the reflective structure 40 and the substrate 10 increases linearly in the direction indicated by the x-axis, and is used to reflect light whose light direction is inclined toward the direction indicated by the x-axis. The vertical distance between the reflective surface 41 of the other part of the reflective structure 40 and the substrate 10 decreases linearly in the target direction, and is used to reflect light whose light direction is inclined in the opposite direction to the direction indicated by the x-axis. Therefore, the reflective surfaces 41 of the two parts of the reflective structures 40 face opposite directions and are used to reflect light in different directions, wherein the reflective surfaces 41 of the multiple reflective structures 40 in each part are parallel.

[0080] In one embodiment, referring to Figure 2 and Figure 6 , Figure 6 FIG. 4 shows a schematic diagram of the structure of a display panel provided by another embodiment of the present disclosure. Figure 2 and Figure 6 As shown, the positive projection of the reflective structure 40 on the target plane is a right triangle or a right trapezoid, and the target plane is a plane parallel to the normal line of the substrate 10;

[0081] The reflective surface 41 is the surface where the hypotenuse of a right triangle or a right trapezoid is located.

[0082] In this embodiment, the target plane is a plane formed by the coordinate axis x and the coordinate axis y, and the positive projection of the reflective structure 40 on the plane can be a right triangle, such as Figure 2 As shown, one right-angled side of the right triangle is located on the surface of the pixel definition layer 20, and the other right-angled side is perpendicular to the pixel definition layer 20. The hypotenuse of the right triangle represents the positive projection of the surface where the reflection surface 41 is located on the target plane; the reflection structure 40 can also be a right-angled trapezoid, such as Figure 6 As shown, the base of the right-angled trapezoid is located on the surface of the pixel definition layer 20, and the hypotenuse of the right-angled trapezoid is the positive projection of the reflection surface 41 on the target plane. Therefore, when the positive projection of the reflection structure 40 on the target plane is a right triangle or a right trapezoid, the vertical distance between the reflection surface 41 and the substrate 10 can be gradually increased in a direction parallel to the substrate 10.

[0083] In one embodiment, the reflective structure 40 includes a base 42 and a reflective layer 43 located on a side of the base 42 facing away from the substrate 10 , and the reflective surface 41 is located on the reflective layer 43 .

[0084] Specifically, the base 42 in the reflective structure 40 is used to support the reflective layer 43. The reflective layer 43 is on the side of the base 42 facing away from the substrate 10. The reflective surface 41 is located on the side of the reflective layer 43 facing away from the base 42. The reflective layer 43 is arranged at an angle. In this way, the vertical distance between the reflective surface 41 and the substrate 10 can be gradually increased in a direction parallel to the substrate 10.

[0085] The material of the substrate 42 may be the same as that of the pixel definition layer 20 . For example, if the pixel definition layer 20 is made of a resin material, the substrate 42 is also made of a resin material.

[0086] In one embodiment, the angle between the reflective surface 41 and the surface of the base 42 close to the pixel definition layer 20 is smaller than the critical angle of total reflection of light at the surface of the packaging layer 30 away from the substrate 10 .

[0087] In this embodiment, continue to refer to Figure 2 The angle between the reflective surface 41 and the surface of the substrate 42 close to the pixel definition layer 20 is α, which ranges from 0° to θ, where θ is the critical angle at which light is totally reflected on the surface of the packaging layer 30 away from the pixel definition layer 20 .

[0088] The reflective layer 43 is made of silver or aluminum. The thickness of the reflective layer 43 is

[0089] For example, the thickness of the reflective layer 43 may be wait.

[0090] In this embodiment, the reflective layer 43 is made of a material with high reflectivity, which may be a metal material such as silver, aluminum, etc., or other materials with high reflectivity.

[0091] The display panel provided by the embodiment of the present disclosure has a reflective structure 40 disposed between the encapsulation layer 30 and the pixel definition layer 20. Since the reflective surface 41 in the reflective structure 40 is disposed at an angle, the reflective surface 41 can reflect light incident from the side of the encapsulation layer 30 away from the pixel definition layer 20. In this way, when the light emitted by the light-emitting device 22 is reflected on the side of the encapsulation layer 30 away from the pixel definition layer 20, it can be re-reflected by the reflective surface 41 to the side of the encapsulation layer 30 away from the pixel definition layer 20 and emitted. As a result, the light originally retained in the display panel can be emitted, thereby improving the light extraction rate of the display panel.

[0092] The display panel provided by the present disclosure is described in detail below with reference to specific examples:

[0093] Example 1: Reference Figure 2The display panel includes a substrate 10, a pixel definition layer 20, a light emitting device 22 located in an opening 21 of the pixel definition layer 20, an encapsulation layer 30, and a reflective structure 40 located between the encapsulation layer 30 and the pixel definition layer 20. Each non-luminous region includes a reflective structure 40, and the positive projection of the reflective structure 40 on the plane formed by the x-axis and the y-axis is a right triangle, and the reflective surface 41 is located on the hypotenuse of the right triangle. Among them, the direction indicated by the arrow is the direction of light propagation. When the light emitted from the light-emitting device 22 is incident on the surface of the side of the packaging layer 30 away from the pixel definition layer 20, it is reflected on the surface and re-incident from the side of the packaging layer 30 away from the pixel definition layer 20. When the incident light is incident on the reflection surface 41, it is reflected again by the reflection surface 41 to the side of the packaging layer 30 away from the pixel definition layer 20. Since the reflection surface 41 is an inclined surface, the incident angle of the reflected light on the side of the packaging layer 30 away from the pixel definition layer 20 is less than the critical angle for total reflection, so that the light can be emitted from the packaging layer 30. As a result, the light originally retained in the display panel can be emitted, thereby improving the light extraction rate of the display panel.

[0094] The light output of the display panel provided in Example 1 and the display panel in the related art is spectrally analyzed to obtain the monochromatic spectrum diagrams corresponding to RGB, such as Figure 8-Figure 10 As shown, Figure 8 The spectra of red light emitted by the display panel provided in Example 1 and the display panel in the related art are shown, wherein Curve 1 is a spectra of red light emitted by the display panel in the related art, and Curve 2 is a spectra of red light emitted by the display panel provided in Example 1; Fig. 9 The spectra of red light emitted by the display panel provided in Example 1 and the display panel in the related art are shown, wherein Curve 1 is a spectra of green light emitted by the display panel in the related art, and Curve 2 is a spectra of green light emitted by the display panel provided in Example 1; Fig.10 The spectrum diagram of the blue light emitted by the display panel provided in Example 1 and the display panel in the related art is shown, wherein Curve 1 is the spectrum diagram of the blue light emitted by the display panel in the related art, and Curve 2 is the spectrum diagram of the blue light emitted by the display panel provided in Example 1; Figure 8-Figure 10 It can be seen that compared with the display panel in the related art that does not adopt the light extraction structure, the display panel shown in this example has a 15% to 30% increase in front-view brightness, and the spectral peak position does not move basically, and the half-wave peak width is slightly widened. Therefore, when RGB synthesizes white light, the brightness of the white light will be increased by 10% to 20%, and the product power consumption will also be improved by 10% to 20%.

[0095] Example 2: Reference Figure 4The display panel includes a substrate 10, a pixel definition layer 20, a light emitting device 22 located in an opening 21 of the pixel definition layer 20, an encapsulation layer 30, and a reflective structure 40 located between the encapsulation layer 30 and the pixel definition layer 20. Each non-luminous region includes two reflective structures 40, and the reflective surfaces 41 of the two reflective structures 40 are parallel. The positive projection of the reflective structure 40 on the plane formed by the x-axis and the y-axis is a right triangle, and the reflective surface 41 is located on the hypotenuse of the right triangle; Figure 4 The direction indicated by the arrow is the direction of light propagation. Figure 4 As shown, the light emitted by the light-emitting device 22 is reflected after entering the side of the packaging layer 30 away from the pixel definition layer 20. At this time, the light re-enters the packaging layer 30 from the side of the packaging layer 30 away from the pixel definition layer 20, and then, when the light passes through the reflective structure 40, it is reflected again by the reflective surface 41, so that it is re-emitted toward the side of the packaging layer 30 away from the pixel definition layer 20, and then when the light passes through the interface between the packaging layer 30 and the cover plate, after being reflected by the reflective surface 41, the incident angle of the light at the interface is less than the critical angle of reflection, so that the light can be emitted from the side of the packaging layer 30 away from the pixel definition layer, thereby allowing the light originally retained in the display panel to be emitted from the display panel, thereby improving the light extraction rate of the display panel.

[0096] Example 3: Reference Figure 6 The display panel includes a substrate 10, a pixel definition layer 20, a light emitting device 22 located in an opening 21 of the pixel definition layer 20, an encapsulation layer 30, and a reflective structure 40 located between the encapsulation layer 30 and the pixel definition layer 20. Each non-luminous region includes a reflective structure 40, and the orthographic projection of the reflective structure 40 on the plane formed by the x-axis and the y-axis is a right-angled trapezoid, and the reflective surface 41 is located on the hypotenuse of the right-angled trapezoid. Figure 6 In the figure, the direction indicated by the arrow is the direction of light propagation. The light emitted by the light-emitting device 22 is reflected after entering the side of the packaging layer 30 away from the pixel definition layer 20. At this time, the light re-enters the packaging layer 30 from the side of the packaging layer 30 away from the pixel definition layer 20. Then, when the light passes through the reflective structure 40, it is reflected again by the reflective surface 41, so that it is re-emitted toward the side of the packaging layer 30 away from the pixel definition layer 20. Then, when the light passes through the interface between the packaging layer 30 and the cover plate, after being reflected by the reflective surface 41, the incident angle of the light at the interface is less than the critical angle of reflection, so that the light can be emitted from the side of the packaging layer 30 away from the pixel definition layer, thereby enabling the light originally retained inside the display panel to be emitted from the display panel, thereby improving the light extraction rate of the display panel.

[0097] Example 4: Reference Figure 7The display panel includes a substrate 10, a pixel definition layer 20, a light emitting device 22 located in an opening 21 of the pixel definition layer 20, an encapsulation layer 30, and a reflective structure 40 located between the encapsulation layer 30 and the pixel definition layer 20. Each non-luminous region includes two reflective structures 40, and the reflective surfaces 41 of the two reflective structures 40 are parallel. The orthographic projection of the reflective structure 40 on the plane formed by the x-axis and the y-axis is a right-angled trapezoid, and the reflective surface 41 is located on the hypotenuse of the right-angled trapezoid. Figure 7 In the figure, the direction indicated by the arrow is the direction of light propagation. The light emitted by the light emitting device 22 is reflected after entering the side of the packaging layer 30 away from the pixel definition layer 20. At this time, the light re-enters the packaging layer 30 from the side of the packaging layer 30 away from the pixel definition layer 20. Then, when the light passes through the reflective structure 40, it is reflected again by the reflective surface 41, so that it is re-emitted toward the side of the packaging layer 30 away from the pixel definition layer 20. Then, when the light passes through the interface between the packaging layer 30 and the cover plate, after being reflected by the reflective surface 41, the incident angle of the light at the interface is less than the critical angle of reflection, so that the light can be emitted from the side of the packaging layer 30 away from the pixel definition layer, thereby allowing the light originally retained in the display panel to be emitted from the display panel, thereby improving the light extraction rate of the display panel.

[0098] Based on the same inventive concept, the present disclosure also provides a method for preparing a display panel, referring to Fig.11 , Fig.11 The schematic diagram of the process of the method for preparing a display panel provided by an embodiment of the present disclosure is shown, which is applied to prepare the display panel described in any of the above embodiments, such as Fig.11 As shown, the preparation method specifically comprises:

[0099] S101, providing a substrate.

[0100] The substrate may be a flexible substrate or a rigid substrate, and may be made of glass or metal.

[0101] S102, forming a pixel definition layer on one side of the substrate.

[0102] Before forming the pixel definition layer, an anode layer may be formed on one side of the substrate, and then the pixel definition layer may be formed on the side of the anode layer away from the substrate, so as to facilitate the subsequent preparation of the light-emitting device.

[0103] S103, opening the pixel definition layer and forming a light emitting device in the opening.

[0104] Specifically, after forming the pixel definition layer, the pixel definition layer is opened according to the required positions of multiple sub-pixels in the light-emitting area to expose the anode layer under the pixel definition layer, and then the organic light-emitting layer, cathode and common layer material of the organic light-emitting layer are evaporated on the exposed anode layer.

[0105] S104, forming a reflective structure on a side of the pixel definition layer facing away from the substrate.

[0106] The process of forming the reflective structure on the side of the pixel definition layer away from the substrate may specifically include first forming a base of the reflective structure at a position where the pixel definition layer is not opened, and the projection of the base on a plane parallel to the normal line of the substrate may be a right triangle or a right trapezoid, etc., including a structure with an inclined surface. After preparing the base, a reflective layer is formed on the surface of the side of the reflective structure away from the pixel definition layer, and the thickness of the reflective layer is The side of the reflective layer facing away from the pixel definition layer is the reflective surface.

[0107] S105, forming an encapsulation layer on a side of the reflective structure facing away from the substrate to obtain a display panel.

[0108] The side of the reflective structure away from the pixel definition layer comprises a reflective surface, and the reflective surface is configured to reflect light incident from the side of the encapsulation layer away from the pixel definition layer.

[0109] In this embodiment, when the encapsulation layer is an inorganic-organic composite encapsulation layer, a plasma-enhanced chemical vapor deposition process can be first used to prepare a first encapsulation layer, that is, a first inorganic layer; after preparing the first encapsulation layer, a patterned substrate is prepared on the inorganic encapsulation layer by a glue coating exposure process. The substrate is located on the side of the pixel definition layer away from the substrate, and its orthographic projection on the substrate does not overlap with the orthographic projection of the opening on the substrate. In this way, the reflective structure can be prevented from blocking light.

[0110] Afterwards, a reflective layer is formed on the side of the base away from the substrate by processes such as evaporation or atomic deposition. The surface of the reflective layer is the reflective surface. The reflective material can be a metal material with high reflectivity such as silver and aluminum, or a non-metallic material with high reflectivity. After the reflective structure is prepared, an organic encapsulation layer is prepared by inkjet printing. After that, a second encapsulation layer, i.e., a second inorganic layer, is prepared on the side of the organic encapsulation layer away from the substrate to obtain a display panel. It is understandable that after the encapsulation layer is prepared, the encapsulation layer is also bonded to the cover plate, which is used to protect the display panel to prevent the display panel from being damaged by impact.

[0111] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0112] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0113] The display panel and the preparation method thereof provided by the present disclosure are introduced in detail above. The principles and implementation methods of the present disclosure are explained in this article using specific examples. The description of the above embodiments is only used to help understand the method of the present disclosure and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present disclosure, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present disclosure.

[0114] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0115] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0116] References herein to "one embodiment," "embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present disclosure. In addition, please note that examples of the term "in one embodiment" do not necessarily all refer to the same embodiment.

[0117] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present disclosure can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0118] In the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A display panel, characterized in that: include: substrate; A pixel definition layer, located on the substrate, comprising a plurality of openings, wherein the openings accommodate light emitting devices; An encapsulation layer, located on a side of the pixel definition layer away from the substrate; and, a reflective structure located between the encapsulation layer and the pixel definition layer; Wherein, a side of the reflective structure away from the pixel definition layer comprises a reflective surface, and the reflective surface is configured to reflect light incident from a side of the encapsulation layer away from the pixel definition layer.

2. The display panel according to claim 1, characterized in that: The orthographic projection of the reflective structure on the substrate is located within the orthographic projection of the pixel definition layer on the substrate and has no overlap with the orthographic projection of the opening on the substrate.

3. The display panel according to claim 1, characterized in that: In a direction parallel to the substrate, a vertical distance between the reflection surface and the substrate increases linearly or nonlinearly.

4. The display panel according to claim 1, characterized in that: The display panel comprises a display area, in which a plurality of sub-pixels are arranged in an array, each of the sub-pixels comprises a light-emitting device located in the opening, and a non-light-emitting area is included between two adjacent sub-pixels; Wherein, the non-luminous area includes one or more of the reflective structures.

5. The display panel according to claim 4, characterized in that: The positive projection of the reflective structure on the target plane is a right triangle or a right trapezoid, and the target plane is a plane parallel to the normal line of the substrate; Wherein, the reflecting surface is the surface where the hypotenuse of the right triangle or the right trapezoid is located.

6. The display panel according to claim 4, characterized in that: In the case where the non-luminous region includes a plurality of the reflective structures, the reflective surfaces of the plurality of the reflective structures are parallel, or, Among the plurality of the reflective structures, the vertical distance between the reflective surface of some reflective structures and the substrate increases linearly in the target direction, and the vertical distance between the reflective surface of another portion of the reflective structures and the substrate decreases linearly in the target direction; Wherein, the target direction is a direction parallel to the substrate.

7. The display panel according to claim 1, characterized in that: The reflective structure comprises a base, and a reflective layer located on a side of the base facing away from the substrate, and the reflective surface is located on the reflective layer.

8. The display panel according to claim 7, characterized in that: The angle between the reflective surface and a surface of the substrate close to the pixel definition layer is smaller than a critical angle at which light is totally reflected on a surface of the packaging layer away from the substrate.

9. The display panel according to claim 7, characterized in that: The reflective layer is made of silver or aluminum. The thickness of the reflective layer is 10. A method for preparing a display panel, characterized in that: Applicable to preparing a display panel as claimed in any one of claims 1 to 9, the method comprising: providing a substrate; forming a pixel definition layer on one side of the substrate; Opening the pixel definition layer and forming a light emitting device in the opening; forming a reflective structure on a side of the pixel definition layer facing away from the substrate; forming an encapsulation layer on a side of the reflective structure away from the substrate to obtain the display panel; Wherein, a side of the reflective structure away from the pixel definition layer comprises a reflective surface, and the reflective surface is configured to reflect light incident from a side of the encapsulation layer away from the pixel definition layer.

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