Organic light-emitting display panel and display device

Abstract

The present invention discloses an organic light-emitting display panel. The panel comprises: a pixel definition layer comprising a plurality of pixel openings; a black matrix layer comprising a plurality of first through-holes and a light-shielding portion surrounding the plurality of first through-holes; a first organic film layer filling at least the first through-holes and forming a second through-hole within each first through-hole; an organic planarization layer covering the black matrix layer and the first organic film layer and filling each second through-hole; and a color filter layer disposed on the organic planarization layer. The present invention reduces light loss within the display panel and improves internal light transmittance.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an organic light-emitting display panel and a display device. Background Art

[0002] Currently, organic light-emitting diode (OLED) mobile phone products are developing towards large size, high refresh rate and high brightness. However, in the absence of a breakthrough in battery technology, the market has put forward higher requirements on the power consumption of OLED products.

[0003] Polarizers (POLs) effectively reduce the panel's reflectivity under strong sunlight, but they also reduce the amount of light emitted by nearly 58%. This significantly increases the lifespan of OLEDs. Furthermore, polarizers are thick and brittle, making them unsuitable for the development of dynamic bending products. Therefore, improving the light extraction efficiency of OLED devices is a key development direction for future low-power OLED products. Summary of the Invention

[0004] The embodiments of the present application provide an organic light-emitting display panel and a display device, wherein a laminated structure including a black matrix layer, a first organic film layer, an organic flattening layer, and a color filter layer can replace a polarizer, reduce light loss inside the display panel, improve the light transmittance inside the display panel, and reduce the reflectivity of the display panel.

[0005] An embodiment of the present application provides an organic light-emitting display panel, comprising:

[0006] An array substrate includes a pixel definition layer, wherein the pixel definition layer includes a plurality of pixel openings;

[0007] a light-emitting device layer comprising a plurality of light-emitting units, each of the light-emitting units being disposed in one of the pixel openings;

[0008] a thin film encapsulation layer, covering the light-emitting device layer;

[0009] A touch layer, provided on the thin film encapsulation layer;

[0010] a black matrix layer, disposed on a side of the touch layer away from the array substrate, and comprising a plurality of first through holes and a light shielding portion surrounding the plurality of first through holes, wherein the plurality of first through holes correspond one-to-one to the plurality of pixel openings;

[0011] a first organic film layer, filling at least the first through-holes, and forming a second through-hole in each of the first through-holes;

[0012] an organic planarization layer covering the black matrix layer and the first organic film layer and filling each of the second through holes; and

[0013] The color filter layer is disposed on the organic flat layer and includes a plurality of color filter units; the plurality of color filter units correspond to the plurality of first through holes one by one.

[0014] Optionally, in some embodiments of the present application, the orthographic projections of each pixel opening and the corresponding first through hole on the plane where the array substrate is located at least partially overlap, and the orthographic projections of the first through hole and the corresponding color filter unit on the plane where the array substrate is located at least partially overlap.

[0015] Optionally, in some embodiments of the present application, the orthographic projections of each pixel opening and the corresponding first through-hole and the color filter unit on the plane where the array substrate is located completely overlap.

[0016] Optionally, in some embodiments of the present application, the refractive index of the organic planar layer is greater than the refractive index of the first organic film layer.

[0017] Optionally, in some embodiments of the present application, the refractive index of the first organic film layer is 1.2 to 1.5; the refractive index of the organic planar layer is 1.7 to 2.0.

[0018] Optionally, in some embodiments of the present application, a cross-section of the second through hole in a direction perpendicular to the array substrate is in the shape of an inverted trapezoid.

[0019] Optionally, in some embodiments of the present application, in each of the second through holes, an acute angle between an interface between the first organic film layer and the organic planar layer and a plane parallel to the array substrate is 40 degrees to 70 degrees.

[0020] Optionally, in some embodiments of the present application, the first organic film layer further covers the surface of the light shielding portion away from the array substrate.

[0021] Optionally, in some embodiments of the present application, the organic light emitting display panel further includes:

[0022] The second organic film layer covers the color filter layer.

[0023] Correspondingly, an embodiment of the present application further provides a display device, which includes any one of the above-mentioned organic light-emitting display panels.

[0024] The embodiment of the present application uses a laminated structure including a black matrix layer, a first organic film layer, an organic planar layer, and a color filter layer to replace the traditional polarizer. Compared to the traditional polarizer, which requires a loss of nearly 58% of the light output, the laminated structure of the embodiment of the present application can reduce the light loss within the display panel and improve the internal luminous transmittance of the display panel. The black matrix's light shielding portion can also absorb external light, thereby reducing the reflectivity of the display panel. In addition, by using a high-refractive index material for the organic planar layer and a low-refractive index material for the first organic film layer, the high-angle light emitted by the light-emitting element can be totally reflected at the interface between the organic planar layer and the first organic film layer, so that the divergent light is concentrated, reducing light scattering loss and improving the forward light output of the light-emitting area. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a schematic cross-sectional layer diagram of an organic light emitting display panel provided in one embodiment of the present application;

[0027] Figure 2 is a schematic cross-sectional layer diagram of an organic light emitting display panel provided in another embodiment of the present application;

[0028] Figure 3 This is a schematic diagram of the optical path principle of the organic light emitting display panel provided in an embodiment of the present application;

[0029] Figure 4 Schematic diagram of the process of manufacturing an organic light-emitting display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0031] The embodiments of the present application provide an organic light-emitting display panel and a display device. Detailed descriptions are provided below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments.

[0032] Please refer to Figures 1 to 3 An embodiment of the present application provides an organic light-emitting display panel, including an array substrate 100, a light-emitting device layer, a thin film encapsulation layer 300, a touch layer 400 and a stacked structure 500, wherein the stacked structure 500 includes a black matrix layer 510, a first organic film layer 520, an organic planarization layer 530 and a color filter layer 540.

[0033] Please refer to Figure 1 and Figure 2 , the array substrate 100 includes a pixel definition layer 130, and the pixel definition layer 130 includes a plurality of pixel openings 131 and a non-pixel opening area 132 surrounding the plurality of pixel openings 131. The plurality of pixel openings 131 are used to define a plurality of light-emitting areas A, and the non-pixel opening area 132 is used to define a non-light-emitting area B. It should be noted that, although only the pixel definition layer 130 is described above for the array substrate 100, some necessary prior art structures are not described in detail, but it can be understood that, in addition to the pixel definition layer 130, the array substrate 100 may also include other structures as needed. For example, in the embodiment of the present application, the array substrate 100 further includes a base substrate 110 and a thin film transistor functional layer 120, wherein the thin film transistor functional layer 120 includes a plurality of thin film transistors for driving the light-emitting device layer to emit light. Exemplarily, the plurality of pixel openings 131 are arranged in an array.

[0034] In one embodiment, the cross-section of the pixel opening 131 in a direction perpendicular to the array substrate 100 is in the shape of an inverted trapezoid, i.e., the area of ​​the upper opening (the opening on the side away from the array substrate 100) of the pixel opening 131 is larger than the area of ​​the lower opening (the opening on the side closer to the array substrate 100), and the pixel opening 131 shrinks from away from the array substrate 100 to closer to the array substrate 100, and the upper opening and the lower opening are generally the same shape. The cross-sectional shape of the pixel opening 131 in a direction parallel to the plane of the array substrate 100 includes, but is not limited to, a circle or a polygon, wherein the polygon includes, but is not limited to, a rhombus, a rectangle (including a square), an octagon, etc.

[0035] Please refer to Figure 1 and Figure 2The light-emitting device layer includes a plurality of light-emitting units 200, each of which is provided in one of the pixel openings 131. The plurality of light-emitting units 200 are used to form sub-pixels, such as red sub-pixels, green sub-pixels, and blue sub-pixels, so that the organic light-emitting display panel can realize a display function. Exemplarily, the light-emitting unit 200 includes an anode layer 210, an OLED light-emitting layer 220, and a cathode layer 230, wherein the anode layer 210 covers the bottom of each of the pixel openings 131, the OLED light-emitting layer 220 covers the anode layer 210 in each of the pixel openings 131, and the cathode layer 230 covers the OLED light-emitting layer 220.

[0036] Please refer to Figure 1 and Figure 2 The thin film encapsulation layer 300 covers the light emitting device layer. The thin film encapsulation layer 300 is used to encapsulate the light emitting device layer to block water vapor and oxygen.

[0037] Please refer to Figure 1 and Figure 2 The touch layer 400 is provided on a side of the thin film encapsulation layer 300 away from the array substrate 100. The touch layer 400 is used to implement a touch function. The structure of the touch layer 400 can adopt a known structure in the prior art and is not particularly limited in this embodiment.

[0038] Please refer to Figure 1 and Figure 2 The black matrix layer 510 is disposed on a side of the touch layer 400 away from the array substrate 100 and includes a plurality of first through-holes 511 and a light shielding portion 512 surrounding the plurality of first through-holes 511. The plurality of first through-holes 511 correspond one-to-one to the plurality of pixel openings 131. The first through-holes 511 penetrate the black matrix layer 510 along the thickness direction of the black matrix layer 510 (i.e., a direction perpendicular to the array substrate 100) to allow light emitted by the light-emitting units 200 to pass through the black matrix layer 510. The light shielding portion 512 surrounding the plurality of first through-holes 511 blocks and absorbs light, thereby preventing light mixing between two adjacent light-emitting units 200 and absorbing light incident from outside the display panel, thereby reducing the reflectivity of the display panel.

[0039] In one embodiment, please refer to Figure 1 and Figure 2The cross-section of the first through-hole 511 in a direction perpendicular to the array substrate 100 is preferably an inverted trapezoid. That is, the area of ​​the upper opening (the opening on the side away from the array substrate 100) of the first through-hole 511 is larger than the area of ​​the lower opening (the opening on the side close to the array substrate 100). The first through-hole 511 shrinks from away from the array substrate 100 to closer to the array substrate 100. Typically, the upper opening and the lower opening have the same shape. The cross-sectional shape of the first through-hole 511 in a direction parallel to the array substrate 100 includes, but is not limited to, a circle or a polygon. The polygon includes, but is not limited to, a rhombus, a rectangle (including a square), an octagon, etc.

[0040] Please refer to Figure 1 and Figure 2 In this embodiment, the first organic film layer 520 is at least filled in the first through hole 511, and a second through hole 521 is formed in each of the first through holes 511. The material of the first organic film layer 520 is preferably a transparent optical adhesive, and the material of the first organic film layer 520 includes but is not limited to an organic material containing acrylic resin, epoxy resin, polyimide, polyethylene and / or siloxane. In one embodiment, please refer to Figure 1 , the first organic film layer 520 is only filled in the first through hole 511, and a second through hole 521 is formed in each of the first through holes 511, so that the first organic film layer 520 only covers the side wall of each of the first through holes 511 and encloses the second through holes 521. In another embodiment, please refer to Figure 2, the first organic film layer 520 fills the first through-holes 511 and forms a second through-hole 521 in each of the first through-holes 511. At the same time, the first organic film layer 520 also covers the surface of the light-shielding portion 512 away from the array substrate 100, so that the first organic film layer 520 simultaneously covers the sidewalls of each of the first through-holes 511 and the surface of the light-shielding portion 512 away from the light-emitting device layer, and the first organic film layer 520 encloses a second through-hole 521 in each of the first through-holes 511. It should be noted that the second through-hole 521 penetrates the first organic film layer 520 along the thickness direction of the first organic film layer 520 (i.e., the direction perpendicular to the array substrate 100), so that the light emitted by the light-emitting unit 200 can enter the second through-hole 521 and can be emitted from the second through-hole 521. It can be understood that the side wall of the first through hole 511 is the portion of the light-shielding portion 512 located within the first through hole 511. By making the first organic film layer 520 cover the light-shielding portion 512 located within each of the first through holes 511, it can not only reduce the light incident into the first through hole 511 from being absorbed by the light-shielding portion 512, but also provide a reflection interface for the large-angle light incident into the first through hole 511, thereby reducing the light loss inside the display panel.

[0041] Please refer to Figure 1 and Figure 2 , the organic planarization layer 530 covers the black matrix layer 510 and the first organic film layer 520, and fills each of the second through holes 521. The material of the organic planarization layer 530 includes but is not limited to an organic material such as acrylic resin, epoxy resin, polyimide, polyethylene and / or siloxane, or a mixed material of any of the above organic materials and zirconium oxide, titanium oxide and / or aluminum oxide particles. It should be noted that the material of the organic planarization layer 530 is different from that of the first organic film layer 520. Please refer to Figure 3 By filling each of the second through-holes 521 with the organic planar layer 530, a light reflection interface can be provided (i.e., the interface between the organic planar layer 530 and the first organic film layer 520 in each of the second through-holes 521). When light is incident on the interface between the organic planar layer 530 and the first organic film layer 520 in each of the second through-holes 521, reflection will occur. This not only reduces the absorption of light by the light-shielding portion 512, but also enables the divergent light emitted by the light-emitting unit 200 to be gathered through reflection, thereby reducing light scattering loss and improving the forward light output of the light-emitting area of ​​the display panel.

[0042] Please refer to Figure 1 and Figure 2The color filter layer 540 is provided on the organic planar layer 530 and includes a plurality of color filter units 541; the plurality of color filter units 541 correspond one-to-one to the plurality of first through-holes 511. The color green light unit includes a red filter unit, a green filter unit, and a blue filter unit, which are used to filter red light, green light, and blue light, respectively. Exemplarily, the cross-sectional shape of the color filter unit 541 in a direction parallel to the array substrate 100 includes, but is not limited to, a circle or a polygon, wherein the polygon includes, but is not limited to, a rhombus, a rectangle (including a square), an octagon, etc.

[0043] Please refer to Figure 1 and Figure 2 , the orthographic projections of each pixel opening 131 and the corresponding first through hole 511 on the plane where the array substrate 100 is located at least partially overlap, and the orthographic projections of the first through hole 511 and the corresponding color filter unit 541 on the plane where the array substrate 100 is located at least partially overlap.

[0044] It should be noted that the orthographic projections of each pixel opening 131 and the first through-hole 511 corresponding thereto on the plane where the array substrate 100 is located at least partially overlap, including at least the following situations: (1) the orthographic projections of each pixel opening 131 and the first through-hole 511 corresponding thereto on the plane where the array substrate 100 is located partially overlap, including at least: (a) the orthographic projections of each pixel opening 131 and the first through-hole 511 corresponding thereto on the plane where the array substrate 100 is located overlap, but the orthographic projections of any one of them do not completely fall into the orthographic projection of the other, for example: the central axis (perpendicular to the direction of the plane where the array substrate 100 is located) of each pixel opening 131 and the central axis (perpendicular to the direction of the plane where the array substrate 100 is located) of the first through-hole 511 corresponding thereto are staggered, and the orthographic projections of the two do not completely fall into the other; (b) any one of the orthographic projections of each pixel opening 131 and the first through-hole 511 corresponding thereto on the plane where the array substrate 100 is located completely falls into the other, for example: each The central axis of the pixel opening 131 (perpendicular to the direction of the plane where the array substrate 100 is located) and the central axis of the corresponding first through hole 511 (perpendicular to the direction of the plane where the array substrate 100 is located) are coincident, and the first through hole 511 is reduced or enlarged according to a certain ratio based on the corresponding pixel opening 131. For example, the central axis of each pixel opening 131 (perpendicular to the direction of the plane where the array substrate 100 is located) and the central axis of the corresponding first through hole 511 (perpendicular to the direction of the plane where the array substrate 100 is located) are staggered, and the orthographic projection of the pixel opening 131 on the plane where the array substrate 100 is located completely falls into the orthographic projection of the corresponding first through hole 511 on the plane where the array substrate 100 is located; (2) the orthographic projection of each pixel opening 131 and the orthographic projection of the corresponding first through hole 511 on the plane where the array substrate 100 are completely overlapped, for example, the orthographic projection shape and size of the pixel opening 131 and the first through hole 511 on the plane where the array substrate 100 are exactly the same.

[0045] It should also be noted that, in the embodiment of the present application, the orthographic projections of the first through hole 511 and the corresponding color filter unit 541 on the plane where the array substrate 100 is located at least partially overlap, which includes at least the following situations: (1) The orthographic projections of the first through hole 511 and the corresponding color filter unit 541 on the plane where the array substrate 100 is located at least partially overlap, which at least includes: (a) The orthographic projections of the first through hole 511 and the corresponding color filter unit 541 on the plane where the array substrate 100 are located overlap, but neither of them completely falls into the other, for example: the central axis of the first through hole 511 (perpendicular to the direction of the plane where the array substrate 100 is located) and the central axis of the corresponding color filter unit 541 (perpendicular to the direction of the plane where the array substrate 100 is located) are staggered, and the two do not completely fall into the other; (b) Either of the orthographic projections of the first through hole 511 and the corresponding color filter unit 541 on the plane where the array substrate 100 is located completely falls into the other, for example: the first through hole 51 1) the central axis (perpendicular to the direction of the plane where the array substrate 100 is located) and the central axis (perpendicular to the direction of the plane where the array substrate 100 is located) of the corresponding color filter unit 541 are coincident, and the color filter unit 541 is reduced or enlarged according to a certain ratio based on the first through hole 511 corresponding to it. For example, the central axis (perpendicular to the direction of the plane where the array substrate 100 is located) of the first through hole 511 and the central axis (perpendicular to the direction of the plane where the array substrate 100 is located) of the corresponding color filter unit 541 are staggered, and the orthographic projection of the first through hole 511 on the plane where the array substrate 100 is located completely falls into the orthographic projection of the corresponding color filter unit 541 on the plane where the array substrate 100 is located; (2) the orthographic projections of the first through hole 511 and the corresponding color filter unit 541 on the plane where the array substrate 100 are completely overlapped, for example, the orthographic projections of the first through hole 511 and the corresponding color filter unit 541 on the plane where the array substrate 100 are exactly the same in shape and size.

[0046] It should also be noted that the orthographic projection described in the embodiment of the present application refers to a projection perpendicular to the plane direction of the array substrate 100; the orthographic projection of the pixel opening 131 described in the embodiment of the present application refers to a closed figure formed by the orthographic projection of the outermost edge of the pixel opening 131 on the array substrate 100; similarly, the orthographic projection of the first through-hole 511 refers to a closed figure formed by the orthographic projection of the outermost edge of the first through-hole 511 on the array substrate 100; the projection of the color filter unit 541 refers to a closed figure formed by the orthographic projection of the outermost edge of the color filter unit 541 on the array substrate 100.

[0047] It should also be noted that in the embodiment of the present application, the shapes of any two of the pixel opening 131, the first through hole 511 and the second through hole 521 may be the same or different, and the cross-sectional shapes of the color filter unit 541 and the first through hole 511 in the direction parallel to the plane of the array substrate 100 may be the same or different.

[0048] In a preferred embodiment, please refer to Figure 1 and Figure 2 The orthographic projections of each pixel opening 131 and the corresponding first through-hole 511 and the color filter unit 541 on the plane where the array substrate 100 is located completely overlap, so that more light emitted by the light-emitting unit 200 can be incident on the second through-hole 521, and more large-angle light can be reflected at the interface between the first organic film layer 520 and the organic flat layer 530, and then filtered by the color filter unit 541 and emitted, so that the display panel has a higher light output rate.

[0049] Please refer to Figure 3In the embodiment of the present application, a laminated structure 500 including a black matrix layer 510, a first organic film layer 520, an organic flat layer 530, and a color filter layer 540 is adopted to replace the polarizer. Compared with the polarizer which needs to lose nearly 58% of the light, the embodiment of the present application can significantly reduce the light loss inside the display panel and improve the light transmittance inside the display panel. In addition, the light shielding portion 512 of the black matrix can also absorb the light incident from the outside, thereby reducing the reflectivity of the display panel. The first organic film layer 520 covers the light shielding portion 512 located at the second through hole 521, which can reduce or prevent the light incident on the first through hole 511 from being reflected by the light shielding portion 512. The first organic film layer 520 and the organic planar layer 530 form a microlens array-like structure within the plurality of first through-holes 511. The interface between the first organic film layer 520 and the organic planar layer 530 provides a reflective interface for high-angle light incident into the first through-holes 511, causing the light to be reflected at the interface. The divergent light emitted by the light-emitting unit 200 is then focused after reflection, thereby increasing the forward light output from the light-emitting area of ​​the display panel and reducing light scattering losses. The light-shielding portion 512 of the black matrix layer 510 can also absorb externally incident light, thereby reducing the reflectivity of the display panel. Furthermore, if the first organic film layer 520 only covers the sidewalls of the first through-holes 511 and does not cover the surface of the light-shielding portion 512 away from the light-emitting device layer, not only can the absorption of externally incident light by the light-shielding portion 512 of the black matrix layer 510 be improved, but the stacked structure 500 can also be thinner.

[0050] In one embodiment, please refer to Figure 1 and Figure 2 The stacked structure 500 of the present embodiment further includes a second organic film layer 550, which covers the color filter layer 540. The second organic film layer 550 performs a planarization function. The material of the second organic film layer 550 is preferably a transparent optical adhesive. The material of the second organic film layer 550 includes, but is not limited to, an organic material containing acrylic resin, epoxy resin, polyimide, polyethylene, and / or siloxane.

[0051] In one embodiment, the refractive index of the organic planar layer 530 is greater than the refractive index of the first organic film layer 520. Figure 3By making the refractive index of the organic planar layer 530 greater than that of the first organic film layer 520, conditions are created for total internal reflection of light. This allows high-angle light emitted by the light-emitting unit 200 to be totally reflected at the interface between the first organic film layer 520 and the organic planar layer 530. This not only converges the high-angle divergent light emitted by the light-emitting unit 200, but also allows high-angle incident light to be totally reflected without refracting into the first organic film layer 520, further reducing light loss and improving light extraction efficiency. It will be appreciated that the critical angle for total internal reflection can be adjusted by adjusting the refractive index of the organic planar layer 530, the refractive index of the first organic film layer 520, the refractive index difference between the organic planar layer 530 and the first organic film layer 520, and the sidewall inclination angle of the second through-hole 521. Furthermore, to make the refractive index of the organic planar layer 530 greater than that of the first organic film layer 520, the organic planar layer 530 can be made of a material with a high refractive index, while the first organic film layer 520 can be made of a material with a low refractive index. In a preferred embodiment, the refractive index of the first organic film layer 520 is 1.2 to 1.5; the refractive index of the organic planar layer 530 is 1.7 to 2.0.

[0052] In one embodiment, please refer to Figure 1 and Figure 2 The cross-section of the second through-hole 521 in a direction perpendicular to the array substrate 100 is in the shape of an inverted trapezoid. It is understood that the area of ​​the upper opening (the opening on the side away from the array substrate 100) of the second through-hole 521 is larger than the area of ​​the lower opening (the opening on the side close to the array substrate 100), that is, the second through-hole 521 shrinks from away from the array substrate 100 to close to the array substrate 100, and the upper opening and the lower opening are generally the same shape. The cross-sectional shape of the second through-hole 521 in a direction parallel to the array substrate 100 includes, but is not limited to, a circle or a polygon, and the polygon includes, but is not limited to, a rhombus, a rectangle (including a square), an octagon, etc.

[0053] In a preferred embodiment, please refer to Figure 1 and Figure 2In each second through-hole 521, the acute angle α formed between the interface between the first organic film layer 520 and the organic planar layer 530 and a plane parallel to the array substrate 100 is between 40 and 70 degrees. It is understood that the interface between the organic planar layer 530 and the first organic film layer 520 serves as the sidewall of the second through-hole 521, and the acute angle α formed between the interface between the organic planar layer 530 and the first organic film layer 520 and a plane parallel to the array substrate 100 can reflect the degree of inclination of the sidewall of the second through-hole 521. Controlling the acute angle α formed between the interface between the first organic film layer 520 and the organic planar layer 530 and a plane parallel to the array substrate 100 in each second through-hole 521 to between 40 and 70 degrees can ensure that more high-angle light emitted by the light-emitting unit 200 is totally reflected at the interface between the first organic film layer 520 and the organic planar layer 530, thereby improving light extraction efficiency of the organic light-emitting display panel.

[0054] In a preferred embodiment, the shape of the lower opening of the pixel opening 131 (the opening on the side close to the array substrate 100), the shape of the lower opening of the first through-hole 511 (the opening on the side close to the array substrate 100), and the cross-sectional shape of the color filter unit 541 in a direction parallel to the plane of the array substrate 100 are all the same, for example, including but not limited to a circle or a polygon, wherein the polygon is but not limited to a rhombus, a rectangle (including a square), an octagon, etc. It should be noted that the dimensions of any two of the aforementioned three shapes may be the same or different, and it is most preferred that the shapes and dimensions of the three are exactly the same. In addition, this embodiment merely provides a preferred implementation scheme. In other embodiments, the cross-sectional shapes of the lower pixel opening, the lower opening of the first through-hole 511, and the color filter unit 541 in a direction parallel to the plane of the array substrate 100 may also be different.

[0055] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] Please refer to Figure 4 The present application also provides a method for preparing the organic light-emitting display panel, including:

[0057] S1. Provide an array substrate 100, wherein the array substrate 100 includes a pixel definition layer 130, and the pixel definition layer 130 includes a plurality of pixel openings 131. The pixel openings 131 are used to define a light-emitting area A, and the non-pixel opening area 132 is used to define a non-light-emitting area B.

[0058] Exemplarily, the array substrate 100 includes a base substrate 110, a thin film transistor functional layer 120, and a pixel definition layer 130; the thin film transistor functional layer 120 is formed on the base substrate 110, and the thin film transistor functional layer 120 includes multiple thin film transistors for driving the light-emitting device layer to emit light; the pixel definition layer 130 is formed on the thin film transistor functional layer 120, and the pixel definition layer 130 includes multiple pixel openings 131 and a non-pixel opening area 132 surrounding the multiple pixel openings 131. The multiple pixel openings 131 can be arranged in an array. It should be noted that the method for preparing the array substrate 100 can adopt a known method in the prior art and is not particularly limited in the embodiments of this application.

[0059] S2 . Prepare a light-emitting device layer on the array substrate 100 . The light-emitting device layer includes a plurality of light-emitting units 200 . One light-emitting unit 200 is disposed in each pixel opening 131 .

[0060] Exemplarily, step S2 includes: preparing an anode layer 210 in each pixel opening 131, and making the anode layer 210 cover the bottom of the pixel opening 131; preparing an OLED light-emitting layer 220 on the anode layer 210, and making the OLED light-emitting layer 220 cover the anode layer 210; and preparing the cathode layer 230, and making the cathode layer 230 cover the OLED light-emitting layer 220 and the pixel definition layer 130.

[0061] S3. Prepare a thin film encapsulation layer 300 so that the thin film encapsulation layer 300 covers the light emitting device layer.

[0062] It should be noted that the thin film encapsulation layer 300 may be prepared by a method known in the art, and is not particularly limited in the embodiments of the present application.

[0063] S4 , preparing a touch layer 400 on the thin film encapsulation layer 300 .

[0064] It should be noted that the touch layer 400 may be prepared by a method known in the art, and is not particularly limited in the present embodiment.

[0065] S5. Prepare a black matrix layer 510 on the side of the touch layer 400 away from the array substrate 100, wherein the black matrix layer 510 includes a plurality of first through holes 511 and a light shielding portion 512 surrounding the plurality of first through holes 511, and the plurality of first through holes 511 correspond one-to-one to the plurality of pixel openings 131.

[0066] Exemplarily, the material of the black matrix layer 510 is coated on the entire surface by spin coating, inkjet printing or slit coating. The thickness of the black matrix layer 510 can be adjusted according to actual requirements, and the thickness is preferably 1 to 10 microns, and the light absorption characteristics of the black matrix layer 510 can be changed by adjusting the transmittance and refractive index of the material; the multiple first through holes 511 are produced by an exposure and development process, and the opening shape, size and side wall inclination angle of the first through holes 511 can be adjusted according to actual needs; the multiple first through holes 511 are preferably consistent with the positions of the multiple pixel openings 131, that is, the position of each first through hole 511 is preferably directly above one of the pixel openings 131 (with the direction away from the array substrate 100 as above).

[0067] S6 , preparing the first organic film layer 520 , and filling the first through-holes 511 with the first organic film layer 520 , and forming a second through-hole 521 in each of the first through-holes 511 .

[0068] In one embodiment, step S6 includes: preparing the first organic film layer 520, and filling the first organic film layer 520 only in the first through hole 511, and forming a second through hole 521 in each of the first through holes 511, that is, the first organic film layer 520 only covers the side wall of each of the first through holes 511 and encloses to form a second through hole 521.

[0069] In another embodiment, step S6 includes: preparing the first organic film layer 520, and filling the first organic film layer 520 in the first through hole 511, and forming a second through hole 521 in each of the first through hole 511, the first organic film layer 520 also covers the surface of the light-shielding portion 512 away from the array substrate 100, that is, the first organic film layer 520 simultaneously covers the side wall of each of the first through hole 511 and the surface of the light-shielding portion 512 away from the light-emitting device layer, and the first organic film layer 520 encloses each of the first through hole 511 to form a second through hole 521.

[0070] Exemplarily, the first organic film layer 520 is entirely coated with a material by spin coating, inkjet printing, or slit coating. The film thickness can be adjusted according to actual requirements, preferably ranging from 1 to 10 microns. The material of the first organic film layer 520 is preferably a transparent optical adhesive. The material of the first organic film layer 520 includes, but is not limited to, an organic material containing acrylic resin, epoxy resin, polyimide, polyethylene, and / or siloxane. A plurality of second through-holes 521 are formed through an exposure and development process. The first organic film layer 520 on the black matrix layer 510 can be removed simultaneously, leaving only the first organic film layer 520 on the sidewalls of the first through-holes 511. Alternatively, the first organic film layer 520 covering the sidewalls of the first through-holes 511 and the surface of the light shielding portion 512 away from the light-emitting device layer can be retained. The positions of the plurality of second through-holes 521 are preferably aligned with the positions of the plurality of pixel openings 131, i.e., each second through-hole 521 is located directly above one of the pixel openings 131 (with the direction away from the array substrate 100 being considered upward). It can be understood that the opening shape, size and inclination angle of the side wall of the second through hole 521 can be adjusted according to actual conditions. By adjusting the opening shape, size, inclination angle of the side wall of the second through hole 521 and the transmittance and refractive index of the first organic film layer 520, light can be reflected on the side wall of the second through hole 521, especially total reflection, and the critical angle of total reflection can be changed.

[0071] S7 , preparing an organic planarization layer 530 , so that the organic planarization layer 530 covers the black matrix layer 510 and the first organic film layer 520 , and fills each of the second through holes 521 .

[0072] Exemplarily, the material of the organic planar layer 530 is coated on the entire surface by spin coating, inkjet printing, or slit coating. The film thickness can be adjusted according to actual requirements, and the film thickness is preferably 5 to 30 microns. The material of the organic planar layer 530 includes, but is not limited to, an organic material of acrylic resin, epoxy resin, polyimide, polyethylene, and / or siloxane, or a mixture of any of the foregoing organic materials and zirconium oxide, titanium oxide, and / or aluminum oxide particles. The material of the organic planar layer 530 is different from that of the first organic film layer 520. When the light emitted by the light-emitting unit 200 is incident on the interface between the organic planar layer 530 and the first organic film layer 520, it will be reflected, thereby converging the divergent light, reducing light scattering loss, and improving the forward light output of the light-emitting area of ​​the display panel.

[0073] In a preferred embodiment, in step S7, the refractive index of the organic planar layer 530 is preferably greater than that of the first organic film layer 520. This facilitates total internal reflection of light, allowing wide-angle light emitted by the light-emitting unit 200 to be totally reflected at the interface between the first organic film layer 520 and the organic planar layer 530, further reducing light loss and improving light extraction efficiency. In a more preferred embodiment, the refractive index of the first organic film layer 520 is between 1.2 and 1.5, while the refractive index of the organic planar layer 530 is between 1.7 and 2.0.

[0074] S8 , preparing the color filter layer 540 on the organic planar layer 530 , wherein the color filter layer 540 includes a plurality of color filter units 541 , and the plurality of color filter units 541 correspond one-to-one to the plurality of first through holes 511 .

[0075] Exemplarily, the color resist material is coated on the entire surface by spin coating, inkjet printing or slit coating, and the film thickness can be adjusted according to actual requirements. The film thickness is preferably 1 to 10 microns; the multiple color filter units 541 are produced by an exposure and development process; the multiple color filter units 541 include a red filter unit, a green filter unit and a blue filter unit, which are used to filter red light, green light and blue light respectively; the multiple color filter units 541 are preferably consistent with the positions of the multiple first through holes 511, that is, each of the color filter units 541 is arranged directly above one of the first through holes 511 (with the direction away from the array substrate 100 as above).

[0076] In one embodiment, the method for preparing the organic light emitting display panel according to the embodiment of the present application further includes:

[0077] S9, preparing a second organic film layer 550, so that the second organic film layer 550 covers the color filter layer 540. The second organic film layer 550 plays a role in planarization.

[0078] Exemplarily, the second organic film layer 550 is entirely coated with a material by spin coating, inkjet printing, or slit coating. The thickness can be adjusted according to actual requirements, preferably ranging from 5 to 30 microns. The material of the second organic film layer 550 is preferably an optical adhesive. The material of the second organic film layer 550 includes, but is not limited to, an organic material containing acrylic resin, epoxy resin, polyimide, polyethylene, and / or siloxane. It should be noted that the material of the second organic film layer 550 can be the same as or different from the material of the first organic film layer 520.

[0079] For the parts not described in detail in the preparation method described in the embodiments of the present application, please refer to the aforementioned description of the various embodiments of the organic light-emitting display panel.

[0080] Correspondingly, an embodiment of the present application further provides a display device, which includes the organic light-emitting display panel described in any one of the above embodiments.

[0081] The above is a detailed introduction to an organic light-emitting display panel and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An organic light emitting display panel, characterized in that: include: An array substrate includes a pixel definition layer, wherein the pixel definition layer includes a plurality of pixel openings; a light-emitting device layer comprising a plurality of light-emitting units, each of the light-emitting units being disposed in one of the pixel openings; a black matrix layer, located on a side of the light-emitting device layer away from the array substrate, and comprising a plurality of first through holes and a light shielding portion surrounding the plurality of first through holes, wherein the plurality of first through holes correspond one-to-one to the plurality of pixel openings; a first organic film layer filling at least the first through-holes, covering sidewalls of the first through-holes, forming a second through-hole in each of the first through-holes, and further covering at least a portion of a surface of the light shielding portion away from the array substrate; a planar layer covering the black matrix layer and the first organic film layer and filling each of the second through holes, wherein the refractive index of the planar layer is greater than the refractive index of the first organic film layer; and The color filter layer is disposed on the flat layer and includes a plurality of color filter units; the plurality of color filter units correspond to the plurality of first through holes one by one.

2. The display panel according to claim 1, wherein The material of the first organic film layer is an organic insulating material.

3. The display panel according to claim 1, wherein The material of the planar layer is an organic material; or, the material of the planar layer is a mixed material of an organic material and an inorganic material.

4. The display panel according to claim 1, wherein: The orthographic projections of each pixel opening and the corresponding first through hole on the plane of the array substrate at least partially overlap, and the orthographic projections of the first through hole and the corresponding color filter unit on the plane of the array substrate at least partially overlap.

5. The display panel according to claim 4, wherein: The orthographic projections of each pixel opening, the corresponding first through hole, and the color filter unit on the plane where the array substrate is located completely overlap.

6. The display panel according to claim 1, wherein: The refractive index of the first organic film layer is 1.2 to 1.5; the refractive index of the planar layer is 1.7 to 2.

0.

7. The display panel according to claim 1, wherein: The cross section of the second through hole in a direction perpendicular to the array substrate is in an inverted trapezoidal shape.

8. The display panel according to claim 7, wherein: In each of the second through holes, an acute angle formed between an interface between the first organic film layer and the planar layer and a plane parallel to the array substrate is 40 degrees to 70 degrees.

9. The display panel according to claim 1, wherein: The first organic film layer also covers the surface of the light shielding portion away from the array substrate.

10. The display panel according to claim 1, wherein In the first through hole, the thickness of the first organic film layer along the direction perpendicular to the sidewall of the first through hole is 1 to 10 microns; the thickness of the flat layer on the side of the light shielding portion away from the array substrate is 5 to 30 microns.

11. The display panel according to claim 1, wherein: The organic light emitting display panel further includes: The second organic film layer covers the color filter layer, and the refractive index of the second organic film layer is 1.3 to 1.

5.

12. A display device, characterized in that: It comprises the display panel according to claim 1.

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