Display panel, display panel preparation method and display device

Abstract

The invention relates to the technical field of display, in particular to a display panel, a display panel preparation method and a display device. The display panel comprises an array substrate, a plurality of OLED devices, a quantum dot light-emitting layer, a plurality of refraction structures and a connecting layer, the refraction structures are located between the OLED devices and the quantum dot light-emitting layer, the refraction structures correspond to the OLED devices, and the refraction structures are used for converging light emitted by the corresponding OLED devices to the center; the connecting layer is located between the OLED device and the quantum dot light-emitting layer and located on the sides, away from the array substrate, of the refraction structures, and the refractive index of the connecting layer is smaller than that of the refraction structures. A high-low refraction structure is formed between the OLED device layer and the quantum dot light-emitting layer through cooperation of the refraction structure and the connecting layer, large-angle light loss can be eliminated, the purpose of light convergence is achieved, light irradiated to the quantum dot light-emitting layer is increased, and therefore the light output amount is increased, and the light-emitting efficiency is effectively improved.

Description

Technical Field

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

[0002] With the rapid development of science and technology, digital display devices such as smart phones and tablet computers have penetrated into every corner of people's lives and become indispensable communication tools. In these devices, the display panel, as a core component, plays a vital role and is an intuitive interface for interaction between people and devices. Among them, OLED (Organic Light-Emitting Diode) display panels have attracted much attention due to their unique advantages. OLED technology not only achieves self-luminescence, gets rid of the limitation of traditional display technology relying on backlight sources, but also significantly improves the ability to save energy and reduce consumption. In addition, its bendability and excellent flexibility bring more possibilities to the design of display devices, making product forms more diversified. At the same time, OLED display panels have extremely fast response speeds and excellent display effects, which bring users a smoother and more realistic visual experience. Therefore, they are favored by the majority of users and are widely used in mainstream terminal products such as smart phones and tablet computers.

[0003] However, despite the many advantages of OLED display panels, current technology still faces certain challenges. In particular, the existing display panels are limited by the structural design and their luminous efficiency still needs to be improved. Summary of the invention

[0004] In view of this, the embodiments of the present disclosure provide a display panel, a method for manufacturing a display panel, and a display device, which solve the problem in the related art that the display panel is limited by the structural design and its luminous efficiency needs to be improved.

[0005] The present disclosure provides a display panel, comprising: an array substrate; a plurality of OLED devices, located on one side of the array substrate; a quantum dot light-emitting layer, located on a side of the OLED devices away from the array substrate; a plurality of refractive structures, located between the OLED devices and the quantum dot light-emitting layer, wherein the plurality of refractive structures correspond to the plurality of OLED devices, and the refractive structures are used to converge the light emitted by the corresponding OLED devices toward the center; a connecting layer, located between the OLED devices and the quantum dot light-emitting layer, and located on a side of the plurality of refractive structures away from the array substrate, wherein the refractive index of the connecting layer is less than the refractive index of the refractive structure.

[0006] According to one embodiment of the present disclosure, a light emitting end is formed on a side of the OLED device facing away from the array substrate; the orthographic projection of the light emitting end on the array substrate is located within the orthographic projection of the refractive structure on the array substrate, or the orthographic projection edge of the light emitting end on the array substrate overlaps with the orthographic projection edge of the refractive structure on the array substrate; preferably, a plurality of the refractive structures correspond one-to-one to a plurality of the OLED devices.

[0007] According to one embodiment of the present disclosure, the orthographic projection of the light emitting end on the array substrate is located within the orthographic projection of the refractive structure on the array substrate; preferably, the minimum distance between the orthographic projection edge of the light emitting end on the array substrate and the orthographic projection edge of the refractive structure on the array substrate is in the range of: 1um-3um; preferably, the minimum distance between the orthographic projection edge of the light emitting end on the array substrate and the orthographic projection edge of the refractive structure on the array substrate is 1um-1.5um; preferably, the area of ​​the orthographic projection of the light emitting end on the array substrate is larger than the area of ​​the orthographic projection of one end of the OLED device close to the array substrate on the array substrate.

[0008] According to one embodiment of the present disclosure, in the direction from the array substrate to the quantum dot light-emitting layer, the refractive structure is a tapered structure, and in the cross section perpendicular to the plane where the array substrate is located, the cross-sectional shape of the refractive structure includes: at least one of a semicircle, a triangle, and a trapezoid.

[0009] According to one embodiment of the present disclosure, it also includes: a pixel definition layer, which is located on a side of the array substrate close to the quantum dot light-emitting layer, the pixel definition layer encloses a plurality of pixel openings, and a plurality of the OLED devices are arranged in the plurality of pixel openings in a one-to-one correspondence; a first encapsulation layer, which is located on a side of the pixel definition layer away from the array substrate, and on a side of the refractive structure and the connecting layer close to the array substrate; preferably, the first encapsulation layer includes a first inorganic layer, a first organic layer, and a second inorganic layer which are sequentially stacked in a direction away from the array substrate.

[0010] According to one embodiment of the present disclosure, the quantum dot light-emitting layer includes: a separation structure and a plurality of quantum dot units and a light-transmitting unit separated by the separation structure; the quantum dot unit includes a red light quantum dot unit and a green light quantum dot unit; preferably, the light emission wavelength of the OLED device is shorter than the light emission wavelength of the quantum dot unit; preferably, the OLED blue light device includes a blue light OLED device; preferably, the orthographic projection area of ​​the end of the red light quantum dot unit away from the array substrate on the array substrate is smaller than the orthographic projection area of ​​the end of the red light quantum dot unit close to the array substrate on the array substrate; preferably, the orthographic projection area of ​​the end of the green light quantum dot unit away from the array substrate on the array substrate is smaller than the orthographic projection area of ​​the end of the green light quantum dot unit close to the array substrate on the array substrate; preferably, the orthographic projection area of ​​the end of the light-transmitting unit away from the array substrate on the array substrate is smaller than the orthographic projection area of ​​the end of the light-transmitting unit close to the array substrate on the array substrate; preferably, the display panel further includes a second encapsulation layer, which is located on the side of the quantum dot layer away from the array substrate; preferably, the second encapsulation layer The layer comprises a third inorganic layer, a second organic layer and a fourth inorganic layer which are sequentially stacked in a direction away from the array substrate; preferably, the display panel further comprises a filter layer, the filter layer is located on a side of the second encapsulation layer away from the array substrate, the filter layer comprises a black matrix and a red light filter unit, a green light filter unit and a blue light filter unit located in the black matrix, the red light filter unit corresponds to the red light quantum dot unit, the green light filter unit corresponds to the green light quantum dot unit, and the blue light filter unit corresponds to the light transmission unit; preferably, the red light filter unit is away from the array substrate. The orthographic projection area of ​​one end of the column substrate on the array substrate is smaller than the orthographic projection area of ​​one end of the red light filter unit close to the array substrate on the array substrate; preferably, the orthographic projection area of ​​one end of the green light filter unit away from the array substrate on the array substrate is smaller than the orthographic projection area of ​​one end of the green light filter unit close to the array substrate on the array substrate; preferably, the orthographic projection area of ​​one end of the blue light filter unit away from the array substrate on the array substrate is smaller than the orthographic projection area of ​​one end of the blue light filter unit close to the array substrate on the array substrate.

[0011] According to one embodiment of the present disclosure, the material of the refractive structure includes acrylic resin photoresist; preferably, the size range of the refractive structure in the direction from the array substrate to the quantum dot light-emitting layer is 1um-3um; preferably, the material of the connecting layer includes acrylic resin, epoxy resin or vinyl resin; preferably, the size range of the connecting layer in the direction from the array substrate to the quantum dot light-emitting layer is 5um-20um.

[0012] The present disclosure also provides a method for manufacturing a display panel, comprising the following steps: providing an array substrate; preparing a plurality of OLED devices on one side of the array substrate; preparing a refractive structure on a side of the OLED device away from the array substrate, wherein the plurality of refractive structures correspond to the plurality of OLED devices, and the refractive structure is used to make the corresponding OLED devices

[0013] The emitted light converges toward the center; a quantum dot light-emitting layer is provided; a connecting layer covering the refractive structure is prepared on a side of the OLED device away from the array substrate, and the quantum dot light-emitting layer is bonded to the connecting layer; or, a connecting layer is prepared on one side of the quantum dot light-emitting layer, and the OLED device and the refractive structure are bonded to the connecting layer.

[0014] According to one embodiment of the present disclosure, the step of preparing a refractive structure on a side of the OLED device away from the array substrate includes: preparing an organic layer on a side of the OLED device away from the array substrate; and patterning the organic layer to obtain the refractive structure.

[0015] The present disclosure further provides a display device, including the display panel of the above embodiment, or including the display panel prepared by the preparation method of the above embodiment.

[0016] The embodiments of the present disclosure provide a display panel, a method for preparing a display panel, and a display device, which form a high-low refraction structure between the OLED device layer and the quantum dot light-emitting layer through the cooperation of the refraction structure and the connection layer, thereby eliminating large-angle light loss, achieving the purpose of light convergence, and increasing the light irradiated to the quantum dot light-emitting layer, thereby increasing the light output and effectively improving the light emission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The figure shows a schematic diagram of the irradiation direction of blue light in a conventional film layer structure OLED display panel.

[0019] Figure 2 FIG. 4 is a schematic diagram of the irradiation direction of blue light in a display panel provided in an embodiment of the present disclosure.

[0020] Figure 3The figure is a front view showing the corresponding relationship between the OLED device and the refractive structure in the display panel provided by an embodiment of the present disclosure.

[0021] Figure 4 Shown is a front view of the corresponding relationship between the OLED device and the refractive structure in the display panel provided by another embodiment of the present disclosure.

[0022] Figure 5 Shown is a top view of the corresponding relationship between the OLED device and the refractive structure in the display panel provided by another embodiment of the present disclosure.

[0023] Figure 6 Shown is a schematic diagram of a refraction structure in a display panel provided in an embodiment of the present disclosure.

[0024] Figure 7 Shown is a schematic diagram of a refraction structure in a display panel provided in another embodiment of the present disclosure.

[0025] Figure 8 Shown is a schematic diagram of a refraction structure in a display panel provided in another embodiment of the present disclosure.

[0026] Fig. 9 Shown is a schematic diagram of a refraction structure in a display panel provided in another embodiment of the present disclosure.

[0027] Fig.10 Shown is a schematic diagram of a refraction structure in a display panel provided in another embodiment of the present disclosure.

[0028] Fig.11 Shown is a schematic diagram of a refraction structure in a display panel provided in another embodiment of the present disclosure.

[0029] Fig.12 Shown is a schematic structural diagram of a display panel provided in an embodiment of the present disclosure.

[0030] Fig.13 Shown is a flow chart of a method for preparing a display panel provided in one embodiment of the present disclosure.

[0031] Reference numerals:

[0032] 10. Array substrate;

[0033] 20. Pixel definition layer;

[0034] 30. OLED device; 31. Light output end;

[0035] 40. First encapsulation layer; 41. First inorganic layer; 42. First organic layer; 43. Second inorganic layer

[0036] 50. quantum dot light-emitting layer; 51. separation structure; 52. red light quantum dot unit; 53. green light quantum dot unit; 54. light-transmitting unit;

[0037] 60. second encapsulation layer; 61. third inorganic layer; 62. second organic layer; 63. fourth inorganic layer;

[0038] 70, filter layer; 71, black matrix; 72, red light filter unit; 73, green light filter unit; 74, blue light filter unit;

[0039] 80, refractive structure; 81, first side wall; 82, first bottom surface; 83, second bottom surface; 84, second side wall; 85, third bottom surface; 86, tip; 87, fourth bottom surface; 88, top surface; 89, third side wall; 810, first component; 811, second component;

[0040] 90. Connection layer. DETAILED DESCRIPTION

[0041] Figure 1 A schematic diagram of the irradiation direction of blue light in a conventional film layer structure OLED display panel is shown. In the related art, in order to improve the color gamut and color accuracy of the display panel, one of the improved methods is to use blue light OLED and cooperate with quantum dot (Quantum Dots, referred to as QD) color film technology, that is, to use QD-OLED technology. Exemplarily, a quantum dot light-emitting layer 50 is formed above the OLED device 30, and the quantum dot light-emitting layer 50 includes a red light quantum dot unit 52, a green light quantum dot unit 53 and a light-transmitting unit 54. In the process of the blue light emitted by the OLED device 30 propagating from the OLED device 30 to the quantum dot layer, due to the divergence of light, partial light loss is generated, which affects the luminous efficiency of the display panel.

[0042] In response to the problem of low luminous efficiency of the above-mentioned display panel, an embodiment of the present disclosure provides a display panel, which forms a high-low refraction structure between the OLED device 30 and the quantum dot light-emitting layer 50 through the cooperation of the refraction structure 80 and the connecting layer 90, thereby eliminating large-angle light loss, achieving the purpose of light convergence, and increasing the blue light irradiated to the quantum dot light-emitting layer 50, thereby increasing the light output and effectively improving the luminous efficiency.

[0043] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0044] like Figure 2As shown, a display panel of this embodiment includes an array substrate 10, a plurality of OLED devices 30, a quantum dot light emitting layer 50, a plurality of refractive structures 80 and a connecting layer 90. The dotted line in the figure indicates the irradiation direction of the light.

[0045] A plurality of OLED devices 30 are arranged in an array on the array substrate 10, with intervals between them, and the OLED devices 30 are used to emit light in a direction away from the array substrate 10. The quantum dot light-emitting layer 50 is located on a side of the OLED device 30 away from the array substrate 10. For ease of description, the following description is based on the example that the quantum dot light-emitting layer 50 shown in the figure is located on the upper side of the OLED device 30.

[0046] The plurality of refractive structures 80 are located between the OLED device 30 and the quantum dot light-emitting layer 50, that is, between the upper side of the OLED device 30 and the lower side of the quantum dot light-emitting layer 50 in the figure. The plurality of refractive structures 80 correspond to the plurality of OLED devices 30, for example, the plurality of refractive structures 80 correspond to the plurality of OLED devices 30 one by one, and each refractive structure 80 is located above the corresponding OLED device 30. In the direction from the array substrate 10 to the quantum dot light-emitting layer 50 (vertically upward direction), the refractive structure 80 is a tapered structure. The connecting layer 90 is located between the OLED device 30 and the quantum dot light-emitting layer 50, and is located on the side of the plurality of refractive structures 80 away from the OLED device 30, and the refractive index of the connecting layer 90 is less than the refractive index of the refractive structure 80.

[0047] The refractive structure 80 with a tapered structure can be understood as the cross-sectional width of the refractive structure 80 perpendicular to the array substrate 10 gradually decreases in the direction from the array substrate 10 to the quantum dot light-emitting layer 50. Since the refractive structure 80 has a tapered structure and the refractive index of the connecting layer 90 is less than the refractive index of the refractive structure 80, a high-low refractive focusing structure can be formed between the refractive structure 80 and the connecting layer 90, so that the light emitted by the OLED device 30 can be concentrated to the middle of the refractive structure 80, so as to achieve a focusing effect, improve light extraction efficiency, and reduce power consumption.

[0048] Combination Figure 3 and Figure 4 In some embodiments of the present disclosure, a light emitting end 31 is formed on a side of the OLED device 30 facing away from the array substrate 10, and an edge of an orthographic projection a of the light emitting end 31 on the array substrate 10 overlaps with an edge of an orthographic projection b of the refractive structure 80 on the array substrate 10, or, an orthographic projection a of the light emitting end 31 on the array substrate 10 is located within an orthographic projection b of the refractive structure 80 on the array substrate 10.

[0049] When the edge of the orthographic projection a of the light emitting end 31 on the array substrate 10 overlaps with the edge of the orthographic projection b of the refractive structure 80 on the array substrate 10, the width of the light emitting end 31 is equal to the width of the refractive structure 80 in any direction parallel to the array substrate 10. When the orthographic projection a of the light emitting end 31 on the array substrate 10 is located within the orthographic projection b of the refractive structure 80 on the array substrate 10, the width of the light emitting end 31 is smaller than the width of the refractive structure 80 in any direction parallel to the array substrate 10.

[0050] In this way, the refractive structure 80 can completely cover the light-emitting end 31 of the OLED device 30 to prevent edge leakage, ensure that all light emitted from the light-emitting end 31 enters the refractive structure 80, achieve a good focusing effect, and further ensure that all light is irradiated to the appropriate position of the quantum dot light-emitting layer 50.

[0051] Combination Figure 5 , when the orthographic projection a of the light emitting end 31 on the array substrate 10 is located within the orthographic projection b of the refractive structure 80 on the array substrate 10, preferably, the minimum distance m between the edge of the orthographic projection a of the light emitting end 31 on the array substrate and the edge of the orthographic projection b of the refractive structure 80 on the array substrate 10 is: 1um-3um, and further, the minimum distance m between the edge of the orthographic projection of the light emitting end 31 on the array substrate 10 and the edge of the orthographic projection of the refractive structure 80 on the array substrate 10 is 1um-1.5um.

[0052] The above-mentioned minimum distance m can be understood as the distance between the edge of the orthographic projection a of the light emitting end 31 on the array substrate 10 and the edge of the orthographic projection b of the refractive structure 80 on the array substrate 10, when the edge of the orthographic projection a of the light emitting end 31 on the array substrate 10 is closest to the edge of the orthographic projection b of the refractive structure 80 on the array substrate 10. Taking the orthographic projection a of the light emitting end 31 on the array substrate 10 as a square and the orthographic projection b of the refractive structure 80 on the array substrate 10 as a circle as an example, the side length of the orthographic projection a of the light emitting end 31 on the array substrate 10 is smaller than the diameter of the orthographic projection b of the refractive structure 80 on the array substrate 10, so that the orthographic projection a of the light emitting end 31 on the array substrate 10 can be completely located within the orthographic projection b of the refractive structure 80 on the array substrate 10, and the center of the orthographic projection a of the light emitting end 31 on the array substrate 10 coincides with the center of the orthographic projection b of the refractive structure 80 on the array substrate 10, then the distance between the corner of the orthographic projection a of the light emitting end 31 on the array substrate 10 and the edge of the orthographic projection b of the refractive structure 80 on the array substrate 10 is the minimum distance m.

[0053] By making the orthographic projection a of the light emitting end 31 on the array substrate 10 located within the orthographic projection b of the refractive structure 80 on the array substrate 10, on the one hand, it can be ensured that all the light emitted from the light emitting end 31 enters the refractive structure 80 to achieve a good light focusing effect, and on the other hand, it can reduce the difficulty of processing the refractive structure 80 to prevent the refractive structure 80 from being unable to completely cover the light emitting end 31 due to processing errors. The minimum distance m between the edge of the orthographic projection a of the light emitting end 31 on the array substrate 10 and the edge of the orthographic projection b of the refractive structure 80 on the array substrate 10 is controlled within the range of 1um-3um, which, in addition to achieving the above-mentioned effect, also has the advantage of being easy to implement and can better adapt to the layout of the OLED device 30.

[0054] Preferably, the area of ​​the orthographic projection of the light emitting end 31 on the array substrate 10 is larger than the orthographic projection area of ​​the end of the OLED device 30 close to the array substrate 10 on the array substrate 10. Furthermore, the cross section of the OLED device 30 in the direction perpendicular to the array substrate 10 is a regular trapezoid. Thus, the OLED device 30 can emit light better, thereby improving the luminous efficiency of the display panel.

[0055] According to the display panel of the embodiment of the present disclosure, in a cross section perpendicular to the plane where the array substrate 10 is located, the cross section of the refractive structure includes at least one of a semicircle, a triangle, and a trapezoid.

[0056] For example, Figure 6 As shown, the refractive structure 80 is a hemispherical structure, which includes a first side wall 81 and a first bottom surface 82. The first side wall 81 is a circular plane and is parallel to the array substrate 10. The first bottom surface 82 is a spherical surface. The edge of the first bottom surface 82 is connected to the edge of the first side wall 81, and the first bottom surface 82 faces the quantum dot light-emitting layer 50. The cross section of this type of refractive structure 80 is semicircular.

[0057] For example, Figure 7 As shown, the refractive structure 80 is semi-cylindrical, and includes a second bottom surface 83 and a second side wall 84, the second bottom surface 83 is a rectangular plane, the second side wall 84 is an arc surface, the second bottom surface 83 is parallel to the array substrate 10, the two ends of the second side wall 84 are connected to the two opposite sides of the second bottom surface 83, and the second side wall 84 faces the quantum dot light-emitting layer 50. The cross section of this form of refractive structure 80 is semicircular.

[0058] For example, Figure 8 and Fig. 9 As shown, the refractive structure 80 is a pyramid structure (e.g., a quadrangular pyramid) or a conical structure, which has a third bottom surface 85 and a tip 86, wherein the third bottom surface 85 is parallel to the array substrate 10 and faces the array substrate 10, and the tip 86 faces the quantum dot light-emitting layer 50. The cross section of this type of refractive structure 80 is triangular.

[0059] For example, Fig.10 As shown, the refractive structure 80 is a truncated cone structure, which has a fourth bottom surface 87, a top surface 88 and a third side wall 89. The fourth bottom surface 87 and the top surface 88 of the refractive structure 80 are parallel to the array substrate 10, and the top surface 88 of the refractive structure 80 faces the quantum dot light-emitting layer 50. The cross section of this type of refractive structure 80 is trapezoidal.

[0060] The above-mentioned refractive structures 80 are only examples, and the refractive structure 80 may also be in other forms, such as Fig.11 As shown, the refractive structure 80 includes a first component part 810 and a second component part 820, wherein the first component part 810 is cylindrical, and its axis is perpendicular to the array substrate 10, and the second component part 811 is hemispherical, located at one end of the first component part 810 facing the quantum dot layer, and connected to the second component part 811.

[0061] Combination Fig.12 In some embodiments of the present disclosure, the display panel further includes a pixel definition layer 20 and a first encapsulation layer 40. The pixel definition layer 20 is located on a side of the array substrate 10 close to the quantum dot light-emitting layer 50, and the pixel definition layer 20 encloses a plurality of pixel openings, and a plurality of OLED devices 30 are arranged in a one-to-one correspondence in the plurality of pixel openings. Optionally, the plurality of pixel openings and the plurality of OLED devices 30 are arranged in a plurality of rows and columns. The first encapsulation layer 40 is located on a side of the pixel definition layer 20 away from the array substrate 10, and on a side of the refractive structure 80 and the connection layer 90 close to the array substrate 10.

[0062] In this embodiment, by providing the first encapsulation layer 40 between the pixel definition layer 20 and the refractive structure 80 and the connection layer 90, the first encapsulation layer 40 can be used to protect the display panel from the external environment, especially to prevent moisture and oxygen from penetrating into the display panel, thereby preventing moisture and oxygen from damaging the OLED material and shortening the service life of the display screen. In addition, the first encapsulation layer 40 is used for molding the refractive structure 80, which can ensure that the pixel definition layer 20 will not be damaged when the refractive structure 80 is patterned by the yellow light process.

[0063] Optionally, the first encapsulation layer 40 includes a first inorganic layer 41 , a first organic layer 42 , and a second inorganic layer 43 which are sequentially stacked in a direction away from the array substrate 10 .

[0064] In some embodiments of the present disclosure, the quantum dot light-emitting layer 50 includes a partition structure 51 and a plurality of quantum dot units and a light-transmitting unit 54 separated by the partition structure 51, wherein the quantum dot unit includes a red light quantum dot unit 52 and a green light quantum dot unit 53. The light-transmitting unit 54 may be a photoresist. The partition structure 51 is an organic photoresist material, which may act as a barrier between the red light quantum dot unit, the green light quantum dot unit 53 and the light-transmitting unit 54 to prevent optical crosstalk.

[0065] Preferably, the emission wavelength of the OLED device 30 is shorter than the emission wavelength of the quantum dot unit.

[0066] Preferably, the OLED device 30 is a blue light OLED device.

[0067] Preferably, the orthographic projection area of ​​the end of the red light quantum dot unit 52 facing away from the array substrate 10 on the array substrate 10 is smaller than the orthographic projection area of ​​the end of the red light quantum dot unit 52 close to the array substrate 10 on the array substrate 10; further, the cross-section of the red light quantum dot unit 52 in the direction perpendicular to the array substrate 10 is an inverted trapezoid.

[0068] Preferably, the orthographic projection area of ​​the end of the green light quantum dot unit 53 facing away from the array substrate 10 on the array substrate 10 is smaller than the orthographic projection area of ​​the end of the green light quantum dot unit 53 close to the array substrate 10 on the array substrate 10; further, the cross-section of the green light quantum dot unit 53 in the direction perpendicular to the array substrate 10 is an inverted trapezoid.

[0069] Preferably, the orthographic projection area of ​​the end of the light-transmitting unit 54 facing away from the array substrate 10 on the array substrate 10 is smaller than the orthographic projection area of ​​the end of the light-transmitting unit 54 close to the array substrate 10 on the array substrate 10; further, the cross-section of the light-transmitting unit 54 in the direction perpendicular to the array substrate 10 is an inverted trapezoid.

[0070] Through the above settings, the light can be better converged and collimated light emission can be achieved as much as possible.

[0071] Preferably, the display panel further includes a second encapsulation layer 60, which is located on the side of the quantum dot layer away from the array substrate 10. The second encapsulation layer 60 can also protect the display panel to prevent it from being affected by the external environment, especially to prevent moisture and oxygen from penetrating into the display panel, thereby preventing moisture and oxygen from damaging the QLED material and the OLED material and shortening the service life of the display screen.

[0072] Preferably, the second encapsulation layer 60 includes a third inorganic layer 61 , a second organic layer 62 and a fourth inorganic layer 63 which are sequentially stacked in a direction away from the array substrate 10 .

[0073] Preferably, the display panel further includes a filter layer 70, which is located on the side of the second encapsulation layer 60 away from the array substrate 10, and the filter layer 70 includes a black matrix 71 and a red light filter unit 72, a green light filter unit 73 and a blue light filter unit 74 located in the black matrix 71, the red light filter unit 72 corresponds to the red light quantum dot unit 52, the green light filter unit 73 corresponds to the green light quantum dot unit 53, and the blue light filter unit 74 corresponds to the light-transmitting unit 54. When the light emitted by the quantum dot light-emitting layer 50 passes through the filter layer 70, it can be accurately filtered by the filter layer 70 to realize the color picture display of the display panel. The black matrix 71 forms a pixel boundary between the red light filter unit 72, the green light filter unit 73 and the blue light filter unit 74, which helps to define the boundary of each pixel, ensure that the organic material in each pixel unit can work accurately in a predetermined area, avoid light leakage between adjacent pixels, and absorb ambient light to reduce light reflection in the non-activated pixel area, thereby improving the display contrast. In OLED, since each pixel can emit light independently, the black matrix 71 avoids light crosstalk between pixels and helps ensure that the non-luminous pixel area is as dark as possible, thereby improving the overall contrast.

[0074] The OD (Optical Density) value of the separation structure 51 in this embodiment is smaller than the OD value of the black matrix 71 , so that the separation structure 51 has a certain light transmittance to meet the exposure requirements.

[0075] Preferably, the orthographic projection area of ​​the end of the red light filtering unit 72 facing away from the array substrate 10 on the array substrate 10 is smaller than the orthographic projection area of ​​the end of the red light filtering unit 72 close to the array substrate 10 on the array substrate 10. Furthermore, the cross-section of the red light filtering unit 72 in the direction perpendicular to the array substrate 10 is a right trapezoid.

[0076] Preferably, the orthographic projection area of ​​the end of the green light filtering unit 73 facing away from the array substrate 10 on the array substrate 10 is smaller than the orthographic projection area of ​​the end of the green light filtering unit 73 close to the array substrate 10 on the array substrate 10; further, the cross-section of the green light filtering unit 73 in the direction perpendicular to the array substrate 10 is a right trapezoid.

[0077] Preferably, the orthographic projection area of ​​the end of the blue light filter unit 74 facing away from the array substrate 10 on the array substrate 10 is smaller than the orthographic projection area of ​​the end of the blue light filter unit 74 close to the array substrate 10 on the array substrate 10. Furthermore, the cross section of the blue light filter unit 74 in the direction perpendicular to the array substrate 10 is a regular trapezoid.

[0078] Through the above arrangement, the lateral light outside the red light filter unit 72, the green light filter unit 73 and the blue light filter unit 74 will be blocked, leaving only the forward-emitting light in the middle to pass through the channel, thereby converging the light and achieving collimated light emission.

[0079] In some embodiments, the edge of the orthographic projection of one end of the red light filtering unit 72 close to the array substrate 10 on the array substrate 10 is located outside the edge of the orthographic projection of one end of the red light quantum dot unit 52 away from the array substrate 10 on the array substrate 10, and in any direction parallel to the array substrate, the distance between the edge of the orthographic projection of one end of the red light filtering unit 72 close to the array substrate 10 on the array substrate 10 and the edge of the orthographic projection of one end of the red light quantum dot unit 52 away from the array substrate 10 on the array substrate 10 is 2un-3um.

[0080] In some embodiments, the edge of the orthographic projection of one end of the green light filtering unit 73 close to the array substrate 10 on the array substrate 10 is located outside the edge of the orthographic projection of one end of the green light quantum dot unit 53 away from the array substrate 10 on the array substrate 10, and in any direction parallel to the array substrate, the distance between the edge of the orthographic projection of one end of the green light filtering unit 73 close to the array substrate 10 on the array substrate 10 and the edge of the orthographic projection of one end of the green light quantum dot unit 53 away from the array substrate 10 on the array substrate 10 is 2un-3um.

[0081] In some embodiments, the edge of the orthographic projection of one end of the blue light filter unit 74 close to the array substrate 10 on the array substrate 10 is located outside the edge of the orthographic projection of one end of the light transmitting unit 54 away from the array substrate 10 on the array substrate 10, and in any direction parallel to the array substrate, the distance between the edge of the orthographic projection of one end of the blue light filter unit 74 close to the array substrate 10 on the array substrate 10 and the edge of the orthographic projection of one end of the light transmitting unit 54 away from the array substrate 10 on the array substrate 10 is 2un-3um.

[0082] In some embodiments of the present disclosure, the material of the refractive structure 80 includes acrylic resin photoresist, and the material of the connecting layer 90 includes acrylic resin, epoxy resin or vinyl resin. When the refractive structure 80 and the connecting layer 90 are made of the above materials, not only can the structural strength and light transmittance requirements in the display panel be met, but also the refractive index of the refractive structure 80 can be ensured to be greater than the refractive index of the connecting layer 90, thereby improving the luminous efficiency of the display panel.

[0083] Optionally, the size of the refractive structure 80 in the direction from the array substrate 10 to the quantum dot light-emitting layer 50 (i.e., the thickness of the refractive structure 80) ranges from 1um to 3um, for example, the thickness of the refractive structure 80 is 1um, 2um, or 3um. The size of the connecting layer 90 in the direction from the array substrate 10 to the quantum dot light-emitting layer 50 (i.e., the thickness of the connecting layer 90) ranges from 5um to 20um, for example, 8um, 12um, 15um, or 20um. Within this range, not only the light-gathering function of the refractive structure 80 and the light-transmitting performance of the connecting layer are achieved, but also the refractive structure 80 and the connecting layer 90 can be better combined to ensure the bonding effect of the connecting layer 90, thereby ensuring the overall strength of the display panel.

[0084] Combine the following Fig.13 A method for manufacturing a display panel according to an embodiment of the present disclosure is described. The following method for manufacturing a display panel and the above-mentioned display panel can be referenced to each other.

[0085] According to a display panel manufacturing method provided in this embodiment, the following steps are included:

[0086] S100 , providing an array substrate 10 .

[0087] S200 , preparing an OLED device 30 on one side of the array substrate 10 .

[0088] S300, preparing a refractive structure 80 on a side of the OLED device 30 away from the array substrate 10. Optionally, preparing the refractive structure 80 on a side of the OLED device 30 includes:

[0089] Preparing an organic layer on one side of the OLED device 30;

[0090] The organic layer is patterned to obtain a refractive structure 80 .

[0091] Among them, the process of patterning several layers adopts yellow light technology.

[0092] S400 , providing a quantum dot light-emitting layer 50 .

[0093] S500, preparing a connecting layer 90 covering the refractive structure 80 on the side of the OLED device 30 having the refractive structure 80, and bonding the quantum dot light-emitting layer 50 to the connecting layer 90; or, preparing a connecting layer 90 on one side of the quantum dot light-emitting layer 50, and bonding the OLED device 30 and the refractive structure 80 to the connecting layer 90.

[0094] In this embodiment, there is no sequence between step S400 and steps S100 to S300. In other words, step S400 and step S100, or step S400 and step S200, or step S400 and step S300 can be performed simultaneously or sequentially.

[0095] Optionally, when the display panel further includes a pixel definition layer 20 , the method further includes: preparing the pixel definition layer 20 on one side of the array substrate 10 , wherein the pixel definition layer 20 encloses and forms a plurality of pixel openings corresponding to the OLED devices 30 one by one.

[0096] Optionally, in the case where the display panel further includes a first encapsulation layer 40 , after step S210 , the step further includes: sequentially forming a pixel definition layer 20 and a first encapsulation layer 40 on one side of the array substrate 10 .

[0097] Optionally, when the display panel further includes a second encapsulation layer 60 , the method further includes: preparing the second encapsulation layer 60 on one side of the quantum dot layer.

[0098] Optionally, when the display panel further includes a filter layer 70 , the filter layer 70 is also prepared on a side of the second encapsulation layer 60 away from the quantum dot layer.

[0099] In this embodiment, the OLED device 30 and the quantum dot light-emitting layer 50 are prepared separately, and after the refractive structure 80 is formed on the OLED device 30, the OLED device 30 and the quantum dot light-emitting layer 50 are connected through the connecting layer 90. This can avoid the problem that after the refractive structure 80 and the connecting layer 90 are prepared in a sequentially stacked preparation process, the high-temperature process cannot be continued to continuously prepare the quantum dot light-emitting layer 50, and the process is simple and feasible.

[0100] The present disclosure also provides a display device, including the display panel described in the above embodiment, or including the display panel prepared by the above preparation method. The display device also has the advantages of the above display panel, which will not be described here, and the details can be found in the above related description.

[0101] The display device provided in this embodiment can be any product or component with a display function, such as a television, a digital camera, a mobile phone, a tablet computer, a laptop computer, a smart watch, an e-book, a navigator, a car computer, etc.

[0102] The phrases "one embodiment", "an embodiment", etc. mentioned in the specification indicate that the embodiment described may include a specific feature, structure or characteristic, but not every embodiment may include the specific feature, structure or characteristic. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments, whether explicitly or not explicitly described.

[0103] It should be understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0104] Additionally, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one component or feature to other components or features as shown in the figures. The spatially relative terms are intended to encompass different orientations of the component in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0105] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0106] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A display panel, characterized in that: include: An array substrate; A plurality of OLED devices are located on one side of the array substrate; A quantum dot light-emitting layer, located on a side of the OLED device away from the array substrate; A plurality of refractive structures, located between the OLED device and the quantum dot light-emitting layer, the plurality of refractive structures corresponding to the plurality of OLED devices, the refractive structures being used to converge the light emitted by the corresponding OLED devices toward the center; A connecting layer is located between the OLED device and the quantum dot light-emitting layer and on a side of the plurality of refractive structures away from the array substrate, and a refractive index of the connecting layer is smaller than a refractive index of the refractive structure.

2. The display panel according to claim 1, characterized in that: A side of the OLED device facing away from the array substrate forms a light output end; The orthographic projection of the light emitting end on the array substrate is located within the orthographic projection of the refractive structure on the array substrate, or the orthographic projection edge of the light emitting end on the array substrate overlaps with the orthographic projection edge of the refractive structure on the array substrate; Preferably, the plurality of refractive structures correspond one-to-one to the plurality of OLED devices.

3. The display panel according to claim 2, characterized in that: The orthographic projection of the light output end on the array substrate is located within the orthographic projection of the refractive structure on the array substrate; Preferably, the minimum distance between the orthographic projection edge of the light output end on the array substrate and the orthographic projection edge of the refractive structure on the array substrate is in the range of: 1um-3um; Preferably, the minimum distance between the orthographic projection edge of the light output end on the array substrate and the orthographic projection edge of the refractive structure on the array substrate is 1um-1.5um; Preferably, an area of ​​an orthographic projection of the light emitting end on the array substrate is larger than an area of ​​an orthographic projection of an end of the OLED device close to the array substrate on the array substrate.

4. The display panel according to any one of claims 1 to 3, characterized in that: In the direction from the array substrate to the quantum dot light-emitting layer, the refractive structure is a tapered structure, and in the cross section perpendicular to the plane where the array substrate is located, the cross-sectional shape of the refractive structure includes: at least one of a semicircle, a triangle, and a trapezoid.

5. The display panel according to any one of claims 1 to 3, characterized in that: Also includes: A pixel definition layer is located on a side of the array substrate close to the quantum dot light-emitting layer, the pixel definition layer encloses a plurality of pixel openings, and the plurality of OLED devices are disposed in the plurality of pixel openings in a one-to-one correspondence; A first encapsulation layer is located on a side of the pixel definition layer away from the array substrate, and is located on a side of the refractive structure and the connection layer close to the array substrate; Preferably, the first encapsulation layer comprises a first inorganic layer, a first organic layer and a second inorganic layer which are sequentially stacked in a direction away from the array substrate.

6. The display panel according to any one of claims 1 to 3, characterized in that: The quantum dot light-emitting layer comprises: A separation structure and a plurality of quantum dot units and light-transmitting units separated by the separation structure; The quantum dot unit includes a red light quantum dot unit and a green light quantum dot unit; Preferably, the light emission wavelength of the OLED device is shorter than the light emission wavelength of the quantum dot unit; Preferably, the OLED blue light device comprises a blue light OLED device; Preferably, the orthographic projection area of ​​one end of the red light quantum dot unit away from the array substrate on the array substrate is smaller than the orthographic projection area of ​​one end of the red light quantum dot unit close to the array substrate on the array substrate; Preferably, the orthographic projection area of ​​one end of the green light quantum dot unit away from the array substrate on the array substrate is smaller than the orthographic projection area of ​​one end of the green light quantum dot unit close to the array substrate on the array substrate; Preferably, an orthographic projection area of ​​an end of the light-transmitting unit away from the array substrate on the array substrate is smaller than an orthographic projection area of ​​an end of the light-transmitting unit close to the array substrate on the array substrate; Preferably, the display panel further comprises a second encapsulation layer, which is located on a side of the quantum dot layer away from the array substrate; Preferably, the second encapsulation layer comprises a third inorganic layer, a second organic layer and a fourth inorganic layer which are sequentially stacked in a direction away from the array substrate; Preferably, the display panel further comprises a filter layer, the filter layer is located on a side of the second encapsulation layer away from the array substrate, the filter layer comprises a black matrix and a red light filter unit, a green light filter unit and a blue light filter unit located in the black matrix, the red light filter unit corresponds to the red light quantum dot unit, the green light filter unit corresponds to the green light quantum dot unit, and the blue light filter unit corresponds to the light-transmitting unit; Preferably, an orthographic projection area of ​​an end of the red light filter unit away from the array substrate on the array substrate is smaller than an orthographic projection area of ​​an end of the red light filter unit close to the array substrate on the array substrate; Preferably, an orthographic projection area of ​​an end of the green light filter unit away from the array substrate on the array substrate is smaller than an orthographic projection area of ​​an end of the green light filter unit close to the array substrate on the array substrate; Preferably, an orthographic projection area of ​​an end of the blue light filter unit away from the array substrate on the array substrate is smaller than an orthographic projection area of ​​an end of the blue light filter unit close to the array substrate on the array substrate.

7. The display panel according to any one of claims 1 to 3, characterized in that: The material of the refractive structure includes acrylic resin photoresist; Preferably, the size of the refractive structure in the direction from the array substrate to the quantum dot light-emitting layer ranges from 1um to 3um; Preferably, the material of the connecting layer includes acrylic resin, epoxy resin or vinyl resin; Preferably, a size of the connection layer in a direction from the array substrate to the quantum dot light-emitting layer ranges from 5um to 20um.

8. A method for preparing a display panel, characterized in that: The following steps are involved: providing an array substrate; Preparing a plurality of OLED devices on one side of the array substrate; A refractive structure is prepared on a side of the OLED device away from the array substrate, wherein a plurality of the refractive structures correspond to a plurality of the OLED devices, and the refractive structure is used to converge the light emitted by the corresponding OLED devices toward the center; Providing a quantum dot light-emitting layer; A connecting layer covering the refractive structure is prepared on a side of the OLED device away from the array substrate, and the quantum dot light-emitting layer is bonded to the connecting layer; or a connecting layer is prepared on one side of the quantum dot light-emitting layer, and the OLED device and the refractive structure are bonded to the connecting layer.

9. The method for preparing a display panel according to claim 8, characterized in that: The step of preparing a refractive structure on a side of the OLED device away from the array substrate includes: Prepare an organic layer on a side of the OLED device away from the array substrate; The organic layer is patterned to obtain the refractive structure.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 7, or a display panel prepared by the preparation method according to claim 8 or 9.

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