Display panel and display device

Abstract

The application provides a display panel and a display device. The display panel comprises a substrate, a light-emitting functional layer, a light-blocking layer, a light-extracting layer and a light-filtering layer. The light-emitting functional layer is arranged on one side of the substrate and comprises a plurality of light-emitting units. The light-blocking layer is arranged on the side of the light-emitting functional layer away from the substrate and comprises a plurality of first openings. The first openings are arranged correspondingly to the light-emitting units. The light-extracting layer covers the sidewalls of the first openings and comprises a plurality of second openings. The second openings are arranged correspondingly to the light-emitting units. The light-filtering layer comprises a plurality of light-filtering units. The light-filtering units fill the second openings and are arranged correspondingly to the light-emitting units. The refractive index of the light-extracting layer is smaller than the refractive index of the light-filtering units. Part of the emitted light of the light-emitting units can irradiate on the sidewalls of the second openings through the light-filtering units, and the part of the emitted light can be emitted from the light-extracting layer after total reflection on the sidewalls of the second openings. Thus, the part of the emitted light can be reduced or avoided to be absorbed by the light-blocking layer, and the light-extracting efficiency of the display panel is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display panel and display device. Background Technology

[0002] Organic light-emitting diode (OLED) display panels offer advantages over liquid crystal displays, including thinner and lighter designs, better display quality, higher resolution, wider color gamut, lower power consumption, and the ability to achieve flexible displays. These advantages have led to their rapid development in recent years, making them the preferred display panel type for mobile terminals.

[0003] Currently, in order to further reduce the production cost of OLED display panels and make them thinner and lighter, a black matrix (BM) + color filter (CF) architecture has been proposed to replace the polarizer with anti-reflective function in the existing architecture. However, OLED display panels with this architecture have the problem of low light extraction efficiency, which leads to high energy consumption of OLED display panels. This problem urgently needs to be solved. Summary of the Invention

[0004] This application provides a display panel and display device that can effectively solve the problems of low light emission efficiency and high energy consumption in existing display panels and display devices.

[0005] On one hand, this application provides a display panel, the display panel comprising: a substrate; a light-emitting functional layer disposed on one side of the substrate and including a plurality of light-emitting units; a light-shielding layer disposed on the side of the light-emitting functional layer opposite to the substrate and including a plurality of first openings, the first openings being correspondingly disposed to the light-emitting units; a light-extraction layer at least covering the sidewalls of the first openings and including a plurality of second openings, the second openings being correspondingly disposed to the light-emitting units; and a light-filtering layer including a plurality of light-filtering units, the light-filtering units filling the second openings and being correspondingly disposed to the light-emitting units; wherein the refractive index of the light-extraction layer is less than the refractive index of the light-filtering units.

[0006] Optionally, the display panel further includes: an inorganic layer disposed on the side of the light-emitting functional layer away from the substrate and in contact with the surface of the light-shielding layer facing the substrate; wherein the light extraction layer passes through the first opening and contacts the inorganic layer, and the light extraction layer includes: an inorganic contact portion in contact with the inorganic layer, the inorganic contact portion being made of an inorganic material.

[0007] Optionally, the display panel further includes: a touch function layer disposed on the side of the light-emitting function layer away from the substrate, and including a touch electrode layer and the inorganic layer; the touch electrode layer includes touch electrodes disposed corresponding to the light-shielding layer, and the light extraction layer is made of inorganic material; wherein, the inorganic layer is disposed on the side of the touch electrode layer away from the substrate.

[0008] Optionally, the edge of the first opening near the inorganic layer is the first edge, and the edge of the second opening near the inorganic layer is the second edge, wherein the distance between the first edge and the second edge is greater than or equal to 1 μm.

[0009] Optionally, in the direction of the substrate toward the light extraction layer, the area of ​​the second opening gradually increases, and the angle between the sidewall of the second opening and the substrate is k, where 45° < k < 90°.

[0010] Optionally, the depth of the second opening is b, and the distance between the first edge and the second edge is less than b / tan(2k-90°).

[0011] Optionally, the depth of the first opening is a, and the thickness of the filter unit is c, where 0 < a < b < c.

[0012] Optionally, the plurality of light-emitting units include: a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit; the plurality of light-filtering units include: a red light-filtering unit, a green light-filtering unit, and a blue light-filtering unit, wherein the red light-filtering unit is configured corresponding to the red light-emitting unit, the green light-emitting unit is configured corresponding to the green light-emitting unit, and the blue light-filtering unit is configured corresponding to the blue light-emitting unit;

[0013] Wherein, the refractive index of the red filter unit is z1; the refractive index of the green filter unit is z2; the refractive index of the blue filter unit is z3; and 0 < z3 < z1 < z2; the light extraction layer includes: a first light extraction unit, a second light extraction unit, and a third light extraction unit, wherein the first light extraction unit is correspondingly disposed to the red filter unit, the second light extraction unit is correspondingly disposed to the green filter unit, and the third light extraction unit is correspondingly disposed to the blue filter unit; wherein, the angle between the sidewall of the second opening in the first light extraction unit and the substrate is k1, the angle between the sidewall of the second opening in the second light extraction unit and the substrate is k2, and the angle between the sidewall of the second opening in the third light extraction unit and the substrate is k3; wherein, k2 < k1 < k3.

[0014] Optionally, the first light extraction unit, the second light extraction unit, and the third light extraction unit each have a second opening, the depth of the second opening in the first light extraction unit is b1; the depth of the second opening in the second light extraction unit is b2; the depth of the second opening in the third light extraction unit is b3; and 0 < b2 < b1 < b3.

[0015] Optionally, the light extraction layer further includes: a first extension that at least partially covers the side of the light-shielding layer away from the substrate; the filter layer further includes: a second extension that at least partially covers the side of the light-shielding layer away from the substrate; the second extension is disposed at a distance from the light-shielding layer from the first extension, or the second extension covers the first extension and is in direct contact with the surface of the light-shielding layer away from the substrate.

[0016] On the other hand, this application also provides a display device, the display device including a housing and a display panel as described in any of the above claims, wherein the housing forms an accommodating space and the display panel is disposed within the accommodating space.

[0017] This application provides a display panel and a display device. The display panel includes a substrate, a light-emitting functional layer, a light-shielding layer, a light extraction layer, and a light-filtering layer. The light-emitting functional layer includes multiple light-emitting units, and the light-filtering layer includes multiple light-filtering units. This application fills the second opening of the light extraction layer with the light-filtering units corresponding to the light-emitting units, and sets the refractive index of the light extraction layer to be less than the refractive index of the light-filtering units. This allows a portion of the emitted light from the light-emitting units to be emitted through the light-filtering units and illuminate the sidewall of the second opening. After total internal reflection at the sidewall of the second opening, the light is emitted from the light-emitting side of the display panel. This reduces or prevents the light-shielding layer from absorbing this portion of the emitted light, thereby improving the light extraction efficiency of the display panel and enhancing the display quality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the display panel provided in Embodiment 1 of this application.

[0020] Figure 2 This is a schematic diagram of the structure of the display panel provided in Embodiment 2 of this application.

[0021] Figure 3This is a schematic diagram of the structure of the display panel provided in Embodiment 3 of this application.

[0022] Figure 4 This is a schematic diagram of the structure of the display panel provided in Embodiment 4 of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0024] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials. Detailed descriptions are provided below; it should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments.

[0025] Example 1

[0026] Figure 1 This is a schematic diagram of the structure of a display panel provided in Embodiment 1 of this application. (Refer to...) Figure 1As shown, Embodiment 1 of this application provides a display panel, which includes: a substrate 10, a light-emitting functional layer 20, a light-shielding layer 50, a light-extracting layer 60, and a light-filtering layer 70. The light-emitting functional layer 20 is disposed on one side of the substrate 10 and includes a plurality of light-emitting units 21. The light-shielding layer 50 is disposed on the side of the light-emitting functional layer 20 away from the substrate 10 and includes a plurality of first openings 51, which are correspondingly disposed with respect to the light-emitting units 21. The light-extracting layer 60 at least covers the sidewalls of the first openings 51 and includes a plurality of second openings 61, which are correspondingly disposed with respect to the light-emitting units 21. The light-filtering layer 70 includes a plurality of light-filtering units 71, which fill the second openings 61 and are correspondingly disposed with respect to the light-emitting units 21. The refractive index of the light-extracting layer 60 is less than the refractive index of the light-filtering units 71.

[0027] Specifically, the display panel provided in this application is an OLED display panel or a Mini / Micro Light Emitting Diode (M-LED) display panel, and the display panel has a light-emitting side, which is the side of the display panel used to display images.

[0028] In the display panel provided in this application, since the filter unit 71, which is disposed corresponding to the light-emitting unit 21, fills the second opening 61 of the light extraction layer 60, and the refractive index of the light extraction layer 60 is less than the refractive index of the filter unit 71, a portion of the emitted light emitted by the light-emitting unit 21 can be irradiated onto the sidewall of the second opening 61 through the filter unit 71, and after total internal reflection on the sidewall of the second opening 61, it is emitted from the light-emitting side of the display panel, thereby reducing or preventing the absorption of this portion of emitted light by the light-shielding layer 50, thereby improving the light extraction efficiency of the display panel and enhancing the display quality.

[0029] Furthermore, the refractive index of the light extraction layer 60 is between 1.4 and 1.6, and the refractive index of the filter unit 71 is between 1.5 and 1.75. It should be noted that in some embodiments of this application, the refractive index of the light extraction layer 60 in different regions may be the same or different; the refractive index of each filter unit 71 may be the same or different.

[0030] In some embodiments of this application, the display panel further includes an inorganic layer 42. The inorganic layer 42 is disposed on the side of the light-emitting functional layer 20 away from the substrate 10 and contacts the surface of the light-shielding layer 50 facing the substrate 10; wherein, the light extraction layer 60 passes through the first opening 51 and contacts the inorganic layer 42, and the light extraction layer includes an inorganic contact portion 62 that contacts the inorganic layer, the inorganic contact portion 62 being made of an inorganic material.

[0031] Specifically, in the display panel provided in this application, the light-shielding layer 50 is, for example, a black matrix with anti-color mixing function, and the material of the black matrix is ​​generally an organic material. When the surface of the light-shielding layer 50 facing the substrate 10 comes into contact with the inorganic layer 42, the surface of the light-shielding layer 50 facing the substrate 10 is prone to peeling. However, the light extraction layer 60 of this application, while covering the sidewall of the first opening 51, also passes through the first opening 51 and comes into contact with the inorganic layer 42. Moreover, the inorganic contact portion 62 where the light extraction layer 60 contacts the inorganic layer 42 is made of inorganic material, making the surface adhesion between the light extraction layer 60 and the inorganic layer 42 greater than that between the light-shielding layer 50 and the inorganic layer 42. This improves the peeling problem of the light-shielding layer 50, enhances the stability of the display panel, and extends the service life of the display panel.

[0032] Preferably, the portion of the light extraction layer 60 in contact with the light-shielding layer 50 is also made of inorganic material, and the surface adhesion between the light extraction layer 60 and the light-shielding layer 50 is greater than the surface adhesion between the light-shielding layer 50 and the inorganic layer 42; the portion of the light extraction layer 60 in contact with the filter unit 71 is also made of inorganic material, and the surface adhesion between the light extraction layer 60 and the filter unit 71 is greater than the surface adhesion between the light-shielding layer 50 and the inorganic layer 42. Further, the light extraction layer 60 is made of inorganic material. Optionally, all portions of the light extraction layer 60 are made of the same material, and all are inorganic materials.

[0033] In some embodiments of this application, the display panel further includes a touch function layer 40. The touch function layer 40 is disposed on the side of the light-emitting function layer 20 away from the substrate 10, and includes a touch electrode layer 41 and the inorganic layer 42; the touch electrode layer 41 includes touch electrodes corresponding to the light-shielding layer 50, and the light extraction layer 60 is made of an inorganic material, wherein the inorganic layer 42 is disposed on the side of the touch electrode layer 41 away from the substrate 10.

[0034] Specifically, the touch electrodes in the touch electrode layer 41 can be self-capacitive or mutual-capacitive.

[0035] Optionally, the touch electrodes in the touch electrode layer 41 are capacitive and include a first touch electrode and a second touch electrode. The first touch electrode and the second touch electrode can be disposed in the same layer or in different layers. When the first touch electrode and the second touch electrode are disposed in the same layer, the touch electrode layer 41 further includes a touch insulating layer disposed on the side of the first touch electrode and the second touch electrode away from the substrate 10, and a bridging electrode disposed on the side of the touch insulating layer away from the substrate 10. The inorganic layer 42 is disposed on the side of the bridging electrode away from the substrate 10. When the first touch electrode and the second touch electrode are disposed in different layers, the touch electrode layer 41 further includes a touch insulating layer disposed on the side of the first touch electrode away from the substrate 10, and a second touch electrode disposed on the side of the touch insulating layer away from the substrate 10. The inorganic layer 42 is disposed on the side of the second touch electrode away from the substrate 10.

[0036] Furthermore, the first and second touch electrodes are made of metal and have a mesh structure. Because the first and second touch electrodes are made of metal, they possess a certain degree of rigidity, and their mesh structure causes a decrease in adhesion between the light-shielding layer 50 and the inorganic layer 42 when the inorganic layer 42 and the light-shielding layer 50 are sequentially stacked on the side of the first and second touch electrodes facing away from the substrate 10, making peeling problems more likely. This application addresses this by providing a light extraction layer 60 that covers the first opening 51 and passes through it. This allows the light extraction layer 60 to effectively limit and fix the light-shielding layer 50, significantly reducing or eliminating the probability of peeling between the inorganic layer 42 and the light-shielding layer 50.

[0037] In some embodiments of this application, the edge of the first opening 51 near one end of the inorganic layer 42 is the first edge 511, the edge of the second opening 61 near one end of the inorganic layer 42 is the second edge 611, and the distance between the first edge 511 and the second edge 611 is greater than or equal to 1 μm.

[0038] Specifically, in the display panel provided in this application, the first edge 511, the second edge 611, and the surface of the inorganic layer 42 facing away from the substrate 10 are coplanar. Since the distance between the first edge 511 and the second edge 611 in the corresponding first opening 51 and second opening 61 is greater than or equal to 1 μm, the width of the portion of the light extraction layer 60 in contact with the inorganic layer 42 is not less than 1 μm. This ensures the contact area between the light extraction layer 60 and the inorganic layer 42, enhances the limiting effect of the portion of the light extraction layer 60 in contact with the inorganic layer 42 on the light-shielding layer 50, and further reduces the probability of the light-shielding layer 50 peeling off.

[0039] In some embodiments of this application, in the direction of the substrate 10 toward the light extraction layer 60, the area of ​​the second opening 61 gradually increases, and the angle between the sidewall of the second opening 61 and the substrate 10 is k, where 45° < k < 90°.

[0040] Specifically, because the area of ​​the second opening 61 gradually increases, and the angle k between the sidewall of the second opening 61 and the substrate 10 is greater than 45° and less than 90°, the probability of some of the emitted light from the light-emitting unit 21 being reflected in the direction towards the substrate 10 (i.e., the backlight side of the display panel) after being irradiated by the filter unit 71 onto the sidewall of the second opening 61 can be greatly reduced or avoided. This further improves the light extraction efficiency of the display panel and enhances the display quality. Optionally, k is 45°, 60°, 75°, or 85°.

[0041] In some embodiments of this application, the depth of the second opening 61 is b, and the distance between the first edge 511 and the second edge 611 is less than b / tan(2k-90°).

[0042] Specifically, when the distance between the first edge 511 and the second edge 611 is greater than or equal to the critical value b / tan(2k-90°), some of the emitted light from the light-emitting unit 21, after being irradiated onto the sidewall of the second opening 61 by the filter unit 71, can undergo total internal reflection in the direction toward the substrate 10. This will lead to a reduction in the light emission efficiency of the display panel. Therefore, by making the distance between the first edge 511 and the second edge 611 less than b / tan(2k-90°), this application can avoid the above situation, thereby reducing light loss and helping to improve the light emission efficiency of the display panel.

[0043] Furthermore, the depth of each of the second openings 61 is the same, that is, b is a fixed value, so as to improve the preparation efficiency of the patterned light extraction layer 60 and reduce the manufacturing cost.

[0044] In some embodiments of this application, the depth of the first opening 51 is a, and the thickness of the filter unit 71 is c, wherein 0 < a < b < c.

[0045] Specifically, by making the thickness of the filter unit 71 greater than the depth of the second opening 61, and the depth of the second opening 61 greater than the depth of the first opening 51, this application enables the length of the filter unit 71 along the extension direction of the sidewall of the second opening 61 to be greater than the length of the sidewall of the second opening 61, and the length of the sidewall of the second opening 61 to be greater than the length of the sidewall of the first opening 51. This facilitates the emission of light emitted by the light-emitting unit 21 from the light-emitting side of the display panel with higher light-emitting efficiency, further improving the display quality of the display panel.

[0046] In some embodiments of this application, the plurality of light-emitting units 21 include: a red light-emitting unit 211, a green light-emitting unit 212, and a blue light-emitting unit 213; the plurality of light-filtering units 71 include: a red light-filtering unit 711, a green light-filtering unit 712, and a blue light-filtering unit 713, wherein the red light-emitting unit 711 is correspondingly disposed to the red light-emitting unit 211, the green light-emitting unit 712 is correspondingly disposed to the green light-emitting unit 212, and the blue light-filtering unit 713 is correspondingly disposed to the blue light-emitting unit 213; wherein the blue light-filtering unit 713, the red light-filtering unit 711, and the green light-filtering unit 712 have the same thickness.

[0047] In some embodiments of this application, the light extraction layer 60 further includes: a first extension 63 that at least partially covers the side of the light-shielding layer 50 away from the substrate 10; the filter layer 70 further includes: a second extension 72 that at least partially covers the side of the light-shielding layer 50 away from the substrate 10; wherein the second extension 72 is disposed at a distance from the light-shielding layer 50 from the first extension 63.

[0048] In some embodiments of this application, the display panel further includes an encapsulation layer 30, which is used to encapsulate and protect the light-emitting unit 21 in the light-emitting functional layer 20 to prevent external water and oxygen from invading into the display panel, causing problems such as poor light emission or failure of the light-emitting unit 21. The encapsulation layer 30 is disposed on the side of the light-emitting functional layer 20 away from the substrate 10, and the touch functional layer 40 is disposed on the side of the encapsulation layer 30 away from the substrate 10. The encapsulation layer 30 can be a single-layer encapsulation film layer or a composite encapsulation film layer formed by stacking inorganic and organic encapsulation film layers.

[0049] In some embodiments of this application, the display panel further includes a planarization layer 80. The planarization layer 80 is disposed on the side of the light filter layer 70 opposite to the substrate 10 to planarize the light-shielding layer 50, the light-extracting layer 60, and the side of the light filter layer 70 opposite to the substrate 10.

[0050] On the other hand, this application also provides a display device, the display device including a housing and a display panel as described in any of the above claims, wherein the housing forms an accommodating space and the display panel is disposed within the accommodating space.

[0051] Example 2

[0052] Figure 2 This is a schematic diagram of the display panel provided in Embodiment 2 of this application. (In conjunction with...) Figure 1 and Figure 2 As shown in Embodiment 2 of this application, a display panel is provided. The display panel includes: a substrate 10, a light-emitting functional layer 20, a light-shielding layer 50, a light-extraction layer 60, and a light-filtering layer 70. The light-emitting functional layer 20 is disposed on one side of the substrate 10 and includes a plurality of light-emitting units 21. The light-shielding layer 50 is disposed on the side of the light-emitting functional layer 20 away from the substrate 10 and includes a plurality of first openings 51, which are correspondingly disposed with respect to the light-emitting units 21. The light-extraction layer 60 at least covers the sidewalls of the first openings 51 and includes a plurality of second openings 61, which are correspondingly disposed with respect to the light-emitting units 21. The light-filtering layer 70 includes a plurality of light-filtering units 71, which fill the second openings 61 and are correspondingly disposed with respect to the light-emitting units 21. The refractive index of the light-extraction layer 60 is less than the refractive index of the light-filtering units 71.

[0053] It should be noted that the display panel provided in Embodiment 2 of this application has a similar structure to the display panel in Embodiment 1 of this application, and the same parts will not be described again in this embodiment.

[0054] In the display panel provided in this embodiment, the light extraction layer 60 further includes: a first extension 63 that at least partially covers the side of the light-shielding layer 50 away from the substrate 10; the filter layer 70 further includes: a second extension 72 that at least partially covers the side of the light-shielding layer 50 away from the substrate 10; wherein the second extension 72 covers the first extension 63 and is in direct contact with the surface of the light-shielding layer 50 away from the substrate 10.

[0055] On the other hand, this application also provides a display device, the display device including a housing and a display panel as described in any of the above claims, wherein the housing forms an accommodating space and the display panel is disposed within the accommodating space.

[0056] Example 3

[0057] Figure 3 This is a schematic diagram of the display panel provided in Embodiment 3 of this application. (In conjunction with...) Figure 1 and Figure 3 As shown in Embodiment 3 of this application, a display panel is provided. The display panel includes: a substrate 10, a light-emitting functional layer 20, a light-shielding layer 50, a light-extraction layer 60, and a light-filtering layer 70. The light-emitting functional layer 20 is disposed on one side of the substrate 10 and includes a plurality of light-emitting units 21. The light-shielding layer 50 is disposed on the side of the light-emitting functional layer 20 away from the substrate 10 and includes a plurality of first openings 51, which are correspondingly disposed with respect to the light-emitting units 21. The light-extraction layer 60 at least covers the sidewalls of the first openings 51 and includes a plurality of second openings 61, which are correspondingly disposed with respect to the light-emitting units 21. The light-filtering layer 70 includes a plurality of light-filtering units 71, which fill the second openings 61 and are correspondingly disposed with respect to the light-emitting units 21. The refractive index of the light-extraction layer 60 is less than the refractive index of the light-filtering units 71.

[0058] It should be noted that the display panel provided in Embodiment 3 of this application has a similar structure to the display panel in Embodiment 1 of this application. For example, the plurality of light-emitting units 21 include: a red light-emitting unit 211, a green light-emitting unit 212, and a blue light-emitting unit 213; the plurality of light-filtering units 71 include: a red light-filtering unit 711, a green light-filtering unit 712, and a blue light-filtering unit 713. The red light-emitting unit 711 is correspondingly arranged with the red light-emitting unit 211, the green light-emitting unit 712 is correspondingly arranged with the green light-emitting unit 212, and the blue light-filtering unit 713 is correspondingly arranged with the blue light-emitting unit 213. The same parts will not be described again in this embodiment.

[0059] In the display panel provided in this embodiment, the refractive index of the red filter unit 711 is z1; the refractive index of the green filter unit 712 is z2; and the refractive index of the blue filter unit 713 is z3; and 0 < z3 < z1 < z2; the light extraction layer 60 includes: a first light extraction unit 601, a second light extraction unit 602, and a third light extraction unit 603. The first light extraction unit 601 is correspondingly disposed with the red filter unit 711, the second light extraction unit 602 is correspondingly disposed with the green filter unit 712, and the third light extraction unit 603 is correspondingly disposed with the blue filter unit 713; wherein, the angle between the sidewall of the second opening 61 in the first light extraction unit 601 and the substrate 10 is k1, the angle between the sidewall of the second opening 61 in the second light extraction unit 602 and the substrate 10 is k2, and the angle between the sidewall of the second opening 61 in the third light extraction unit 603 and the substrate 10 is k3; wherein, k2 < k1 < k3.

[0060] Specifically, in order to improve the brightness of the display panel at a normal viewing angle, the non-perpendicular emitted light from the light-emitting unit 21 needs to be reflected by the sidewall of the second opening 61 in the light extraction layer 60 and emitted as much as possible in a direction perpendicular to the substrate 10. The angle k between the sidewall of the second opening 61 and the substrate 10 satisfies the following relationship: k = arcsin(refractive index of the light extraction layer) / (refractive index of the filter unit).

[0061] Based on this, assuming the refractive indices of the first light extraction unit 601, the second light extraction unit 602, and the third light extraction unit 603 are the same, then the larger the refractive index of the filter unit 71, the smaller the value of k. Since the refractive index of the blue filter unit 713 is less than that of the red filter unit 711, and the refractive index of the red filter unit 711 is less than that of the green filter unit 712, therefore, k2 < k1 < k3. That is, when k2 < k1 < k3, the brightness of the display panel at a normal viewing angle can be greatly increased, further improving the display quality of the display panel.

[0062] In some embodiments of this application, the first light extraction unit 601, the second light extraction unit 602, and the third light extraction unit 603 each have a second opening 61. The depth of the second opening 61 in the first light extraction unit 601 is b1; the depth of the second opening 61 in the second light extraction unit 602 is b2; and the depth of the second opening 61 in the third light extraction unit 603 is b3; and 0 < b2 < b1 < b3.

[0063] Specifically, the blue light-emitting unit 213 has a higher efficiency in improving light efficiency than the red light-emitting unit 211; and the red light-emitting unit 211 has a higher efficiency in improving light efficiency than the green light-emitting unit 212. This application, by setting the depth of the second opening 61 in the third light extraction unit 603 to be greater than the depth of the second opening 61 in the first light extraction unit 601, and setting the depth of the second opening 61 in the first light extraction unit 601 to be greater than the depth of the second opening 61 in the second light extraction unit 602, can further improve the efficiency of the light extraction layer in improving the light efficiency of the display panel while ensuring the display quality of the display panel.

[0064] On the other hand, this application also provides a display device, the display device including a housing and a display panel as described in any of the above claims, wherein the housing forms an accommodating space and the display panel is disposed within the accommodating space.

[0065] Example 4

[0066] Figure 4 This is a schematic diagram of the display panel provided in Embodiment 4 of this application. (In conjunction with...) Figure 3 and Figure 4 As shown in Embodiment 4 of this application, a display panel is provided. The display panel includes: a substrate 10, a light-emitting functional layer 20, a light-shielding layer 50, a light-extraction layer 60, and a light-filtering layer 70. The light-emitting functional layer 20 is disposed on one side of the substrate 10 and includes a plurality of light-emitting units 21. The light-shielding layer 50 is disposed on the side of the light-emitting functional layer 20 away from the substrate 10 and includes a plurality of first openings 51, which are correspondingly disposed with respect to the light-emitting units 21. The light-extraction layer 60 at least covers the sidewalls of the first openings 51 and includes a plurality of second openings 61, which are correspondingly disposed with respect to the light-emitting units 21. The light-filtering layer 70 includes a plurality of light-filtering units 71, which fill the second openings 61 and are correspondingly disposed with respect to the light-emitting units 21. The refractive index of the light-extraction layer 60 is less than the refractive index of the light-filtering units 71.

[0067] It should be noted that the display panel provided in Embodiment 4 of this application has a similar structure to the display panel in Embodiment 3 of this application, and the same parts will not be described again in this embodiment.

[0068] In the display panel provided in this embodiment, the light extraction layer 60 further includes: a first extension 63 that at least partially covers the side of the light-shielding layer 50 away from the substrate 10; the filter layer 70 further includes: a second extension 72 that at least partially covers the side of the light-shielding layer 50 away from the substrate 10; wherein the second extension 72 covers the first extension 63 and is in direct contact with the surface of the light-shielding layer 50 away from the substrate 10.

[0069] On the other hand, this application also provides a display device, the display device including a housing and a display panel as described in any of the above claims, wherein the housing forms an accommodating space and the display panel is disposed within the accommodating space.

[0070] In summary, this application provides a display panel and a display device. The display panel includes a substrate, a light-emitting functional layer, a light-shielding layer, a light extraction layer, and a light-filtering layer. The light-emitting functional layer is disposed on one side of the substrate and includes multiple light-emitting units. The light-shielding layer is disposed on the side of the light-emitting functional layer away from the substrate and includes multiple first openings, each corresponding to a light-emitting unit. The light extraction layer covers the sidewall of the first opening and includes multiple second openings, each corresponding to a light-emitting unit. The light-filtering layer includes multiple light-filtering units that fill the second openings and are corresponding to the light-emitting units. The refractive index of the light extraction layer is less than that of the light-filtering units, allowing some of the emitted light from the light-emitting units to pass through the light-filtering units and illuminate the sidewall of the second opening. After total internal reflection at the sidewall of the second opening, the light is emitted from the light-emitting side of the display panel, thereby reducing or preventing the absorption of this portion of emitted light by the light-shielding layer and improving the light extraction efficiency of the display panel.

[0071] The above provides a detailed description of a display panel and display device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display panel, characterized in that, include: Substrate; A light-emitting functional layer is disposed on one side of the substrate and includes multiple light-emitting units; A light-shielding layer is disposed on the side of the light-emitting functional layer away from the substrate, and includes a plurality of first openings, the first openings being disposed corresponding to the light-emitting units; The light extraction layer at least covers the sidewall of the first opening and includes a plurality of second openings, the second openings being disposed corresponding to the light-emitting units; A light-filtering layer includes multiple light-filtering units, which fill the second opening and are correspondingly disposed with the light-emitting unit; wherein the refractive index of the light-extracting layer is less than the refractive index of the light-filtering unit; The light extraction layer further includes a first extension that at least partially covers the side of the light-shielding layer away from the substrate; the filter layer further includes a second extension that at least partially covers the side of the light-shielding layer away from the substrate. The second extension is disposed at a distance from the first extension of the light-shielding layer, or the second extension covers the first extension and is in direct contact with the side surface of the light-shielding layer away from the substrate.

2. The display panel according to claim 1, characterized in that, The display panel further includes: an inorganic layer disposed on the side of the light-emitting functional layer away from the substrate, and in contact with the surface of the light-shielding layer facing the substrate; The light extraction layer passes through the first opening and contacts the inorganic layer, and the light extraction layer includes an inorganic contact portion that contacts the inorganic layer, the inorganic contact portion being made of an inorganic material.

3. The display panel according to claim 2, characterized in that, The display panel further includes: a touch function layer disposed on the side of the light-emitting function layer opposite to the substrate, and including a touch electrode layer and the inorganic layer; the touch electrode layer includes touch electrodes disposed corresponding to the light-shielding layer, and the light extraction layer is made of inorganic material; The inorganic layer is disposed on the side of the touch electrode layer opposite to the substrate.

4. The display panel according to claim 2, characterized in that, The edge of the first opening near the inorganic layer is the first edge, and the edge of the second opening near the inorganic layer is the second edge, wherein the distance between the first edge and the second edge is greater than or equal to 1 μm.

5. The display panel according to claim 4, characterized in that, In the direction of the substrate toward the light extraction layer, the area of ​​the second opening gradually increases, and the angle between the sidewall of the second opening and the substrate is k, where 45° < k < 90°.

6. The display panel according to claim 5, characterized in that, The depth of the second opening is b, and the distance between the first edge and the second edge is less than b / tan(2k-90°).

7. The display panel according to claim 6, characterized in that, The depth of the first opening is a, and the thickness of the filter unit is c, where 0 < a < b < c.

8. The display panel according to claim 6, characterized in that, The plurality of light-emitting units include: a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit; the plurality of light-filtering units include: a red light-filtering unit, a green light-filtering unit, and a blue light-filtering unit, wherein the red light-emitting unit is configured corresponding to the red light-emitting unit, the green light-emitting unit is configured corresponding to the green light-emitting unit, and the blue light-emitting unit is configured corresponding to the blue light-emitting unit; Wherein, the refractive index of the red filter unit is z1; the refractive index of the green filter unit is z2; the refractive index of the blue filter unit is z3; and 0 < z3 < z1 < z2; The light extraction layer includes a first light extraction unit, a second light extraction unit, and a third light extraction unit. The first light extraction unit is configured corresponding to the red filter unit, the second light extraction unit is configured corresponding to the green filter unit, and the third light extraction unit is configured corresponding to the blue filter unit. Wherein, the angle between the sidewall of the second opening in the first light extraction unit and the substrate is k1, the angle between the sidewall of the second opening in the second light extraction unit and the substrate is k2, and the angle between the sidewall of the second opening in the third light extraction unit and the substrate is k3; wherein, k2 < k1 < k3.

9. The display panel according to claim 8, characterized in that, The first light extraction unit, the second light extraction unit, and the third light extraction unit each have a second opening. The depth of the second opening in the first light extraction unit is b1, and the depth of the second opening in the second light extraction unit is b2. The depth of the second opening in the third light extraction unit is b3; And 0 < b2 < b1 < b3.

10. The display panel according to claim 1, characterized in that, The refractive index of the light extraction layer is 1.4 to 1.6, and the refractive index of the filter unit is 1.5 to 1.75.

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