Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device, which are used for improving the luminous efficiency of quantum dots. The display panel provided by the invention comprises a substrate, which comprises a plurality of sub-pixel regions arranged in an array along a first direction and a second direction; the plurality of light emitting devices are positioned on one side of the substrate; the light-emitting devices are in one-to-one correspondence with the sub-pixel regions; the first pixel definition layer is located on the side, away from the substrate, of the light emitting device and comprises first opening areas in one-to-one correspondence with the sub-pixel areas. The multiple quantum dot layers are located on the side, away from the substrate, of the light-emitting device and located in at least part of the first opening areas; the quantum dot layer comprises a first sub-layer and a second sub-layer located on the side, away from the substrate, of the first sub-layer; the first sub-layer comprises a first base material and first quantum dots; the second sub-layer comprises a second base material and second quantum dots; the wavelength range of the light emitted from the first sub-layer does not completely coincide with the wavelength range of the light emitted from the second sub-layer.

Description

Technical Field

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

[0002] Organic light emitting diodes (OLED) have the advantages of thin thickness, fast response speed, low driving voltage, wide operating temperature range, self-luminescence, low energy consumption and the ability to prepare flexible devices. They are one of the hot spots in the field of display and lighting research at home and abroad. However, their luminous spectrum is wide and the color gamut coverage has reached its peak, which limits their development. As an emerging technology, quantum dot light emitting diodes (QLED) have the quantum confinement effect of quantum dot materials themselves, which converts their continuous energy bands into discrete energy levels and can emit high-purity light with a narrow peak width. They have attracted much attention and research in recent years. At present, the more mature quantum dot (QD)-OLED devices use non-pixelated blue light OLED devices as backlight sources, and blue light excites red QD and green QD to emit red light and green light respectively. However, the absorption of blue backlight by QD materials themselves is limited, which limits the luminous efficiency of quantum dots and the uniformity of light output brightness is poor. Summary of the invention

[0003] The embodiments of the present disclosure provide a display panel and a method for manufacturing the same, and a display device, so as to improve the luminous efficiency of quantum dots.

[0004] An embodiment of the present disclosure provides a display panel, the display panel comprising:

[0005] A substrate, comprising a plurality of sub-pixel regions arranged in an array along a first direction and a second direction; the first direction intersects the second direction;

[0006] A plurality of light emitting devices are located on one side of the substrate; the light emitting devices correspond to the sub-pixel areas one by one;

[0007] A first pixel definition layer, located on a side of the light emitting device away from the substrate, comprising first opening areas corresponding to the sub-pixel areas one by one;

[0008] A plurality of quantum dot layers are located on a side of the light-emitting device away from the substrate and within at least a portion of the first opening area; the quantum dot layer comprises: a first sublayer and a second sublayer located on a side of the first sublayer away from the substrate; the first sublayer comprises: a first substrate and first quantum dots; the second sublayer comprises: a second substrate and second quantum dots; the wavelength range of light emitted from the first sublayer does not completely overlap with the wavelength range of light emitted from the second sublayer.

[0009] In some embodiments, the second sub-layer further includes first scattering particles.

[0010] In some embodiments, in a direction perpendicular to the substrate, a thickness of the first sub-layer is less than or equal to a thickness of the second sub-layer.

[0011] In some embodiments, the quantum dot layer further includes: a third sublayer located on a side of the first sublayer away from the substrate; the third sublayer includes a third base material and first scattering particles.

[0012] In some embodiments, the third sublayer is located between the first sublayer and the second sublayer.

[0013] In some embodiments, the second sub-layer is located between the first sub-layer and the third sub-layer.

[0014] In some embodiments, in a direction perpendicular to the substrate, the thickness of the first sublayer is less than or equal to the thickness of the third sublayer, and the thickness of the second sublayer is less than or equal to the thickness of the third sublayer.

[0015] In some embodiments, the plurality of sub-pixel regions include: a plurality of red sub-pixel regions, a plurality of blue sub-pixel regions, and a plurality of green sub-pixel regions;

[0016] The light emitting device is a blue light emitting device;

[0017] The multiple quantum dot layers include: a red light quantum dot layer located in the first opening area corresponding to the red sub-pixel area, and a green light quantum dot layer located in the first opening area corresponding to the green sub-pixel area.

[0018] In some embodiments, the second sublayer further comprises first scattering particles;

[0019] In the red light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 20% and less than or equal to 40%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 5% and less than or equal to 20%, and the mass percentage of the first scattering particles in the second sublayer is greater than or equal to 2% and less than or equal to 8%;

[0020] In the green light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 30% and less than or equal to 55%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 10% and less than or equal to 40%, and the mass percentage of the first scattering particles in the second sublayer is greater than or equal to 4% and less than or equal to 8%.

[0021] In some embodiments, in a direction perpendicular to the substrate, a ratio of a thickness of a first sublayer included in the red light quantum dot layer to a thickness of the red light quantum dot layer is greater than or equal to 1 / 10 and less than or equal to 1 / 2, and a ratio of a thickness of a second sublayer included in the red light quantum dot layer to a thickness of the red light quantum dot layer is greater than or equal to 1 / 2 and less than or equal to 9 / 10;

[0022] In a direction perpendicular to the substrate, the ratio of the thickness of the first sublayer included in the green light quantum dot layer to the thickness of the green light quantum dot layer is greater than or equal to 1 / 10 and less than or equal to 1 / 3, and the ratio of the thickness of the second sublayer included in the green light quantum dot layer to the thickness of the green light quantum dot layer is greater than or equal to 1 / 3 and less than or equal to 9 / 10.

[0023] In some embodiments, the quantum dot layer further comprises a third sublayer;

[0024] In the red light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 20% and less than or equal to 40%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 5% and less than or equal to 20%, and the mass percentage of the first scattering particles in the third sublayer is greater than or equal to 2% and less than or equal to 8%;

[0025] In the green light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 30% and less than or equal to 55%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 10% and less than or equal to 40%, and the mass percentage of the first scattering particles in the third sublayer is greater than or equal to 4% and less than or equal to 10%.

[0026] In some embodiments, in a direction perpendicular to the substrate, the ratio of the thickness of the first sublayer included in the red light quantum dot layer to the thickness of the red light quantum dot layer is greater than or equal to 1 / 10 and less than or equal to 1 / 3, the ratio of the thickness of the third sublayer included in the red light quantum dot layer to the thickness of the red light quantum dot layer is greater than or equal to 1 / 3 and less than or equal to 4 / 5, and the ratio of the thickness of the second sublayer included in the red light quantum dot layer to the thickness of the red light quantum dot layer is greater than or equal to 1 / 10 and less than or equal to 1 / 3;

[0027] In a direction perpendicular to the substrate, the ratio of the thickness of the first sublayer included in the green quantum dot layer to the thickness of the green quantum dot layer is greater than or equal to 1 / 5 and less than or equal to 1 / 3, the ratio of the thickness of the third sublayer included in the green quantum dot layer to the thickness of the green quantum dot layer is greater than or equal to 1 / 3 and less than or equal to 2 / 5, and the ratio of the thickness of the second sublayer included in the green quantum dot layer to the thickness of the green quantum dot layer is greater than or equal to 1 / 3 and less than or equal to 2 / 5.

[0028] In some embodiments, the display panel further includes: a scattering layer in the first opening area corresponding to the blue sub-pixel area;

[0029] The scattering layer comprises: a plurality of scattering sub-layers stacked in layers; the scattering sub-layers comprise: a third substrate and second scattering particles; and the plurality of scattering sub-layers are formed in different process steps.

[0030] In some embodiments, the multi-layer scattering sublayer includes: a first scattering sublayer and a second scattering sublayer located on a side of the first scattering sublayer facing away from the substrate;

[0031] In a direction perpendicular to the substrate, the thickness of the first scattering sublayer is less than or equal to the thickness of the second scattering sublayer.

[0032] In some embodiments, in a direction perpendicular to the substrate, a ratio of a thickness of the first scattering sublayer to a thickness of the scattering layer is greater than or equal to 1 / 3 and less than or equal to 1 / 2, and a ratio of a thickness of the second scattering sublayer to a thickness of the scattering layer is greater than or equal to 1 / 2 and less than or equal to 2 / 3.

[0033] In some embodiments, the mass percentage of the second scattering particles in the first scattering sublayer is greater than or equal to 4% and less than or equal to 10%;

[0034] The mass percentage of the second scattering particles in the first scattering sublayer is greater than or equal to 2% and less than or equal to 6%.

[0035] A method for manufacturing a display panel provided by an embodiment of the present disclosure includes:

[0036] Providing a substrate; the substrate comprises a plurality of sub-pixel regions arranged in an array along a first direction and a second direction; the first direction intersects the second direction;

[0037] A plurality of light emitting devices are formed on one side of the substrate; the light emitting devices correspond to the sub-pixel areas one by one;

[0038] A pattern of a first pixel definition layer is formed on a side of the light emitting device away from the substrate; the first pixel definition layer includes first opening areas corresponding to the sub-pixel areas one by one;

[0039] A quantum dot layer is formed in at least part of the first opening area; the quantum dot layer includes: a first sublayer, and a second sublayer located on the side of the first sublayer away from the substrate; the first sublayer includes: a first substrate and first quantum dots; the second sublayer includes: a second substrate and second quantum dots; the wavelength range of light emitted from the first sublayer does not completely overlap with the wavelength range of light emitted from the second sublayer.

[0040] In some embodiments, forming a quantum dot layer specifically includes:

[0041] forming a first sublayer including first quantum dots;

[0042] A second sublayer including first scattering particles and second quantum dots is formed on the side of the first sublayer facing away from the substrate.

[0043] In some embodiments, forming a quantum dot layer specifically includes:

[0044] forming a first sublayer including first quantum dots;

[0045] forming a third sublayer including first scattering particles on a side of the first sublayer facing away from the substrate;

[0046] A second sublayer including second quantum dots is formed on the side of the third sublayer facing away from the first sublayer.

[0047] In some embodiments, forming a quantum dot layer specifically includes:

[0048] forming a first sublayer including first quantum dots;

[0049] Forming a first type of second sublayer including second quantum dots on a side of the first sublayer away from the substrate;

[0050] A third sublayer including first scattering particles is formed on a side of the second sublayer facing away from the first sublayer.

[0051] In some embodiments, the plurality of sub-pixel regions include: a plurality of blue sub-pixel regions; and the method further includes:

[0052] Multiple scattering sub-layers are sequentially formed in the first opening area corresponding to the blue sub-pixel area.

[0053] A display device provided by an embodiment of the present disclosure includes the display panel provided by an embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 A schematic diagram of the structure of a quantum dot layer provided for related technologies;

[0056] Figure 2 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure;

[0057] Figure 3 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0058] Figure 4A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0059] Figure 5 A viewing angle and brightness attenuation curve diagram provided by an embodiment of the present disclosure;

[0060] Figure 6 A spectrum diagram of a quantum dot layer provided in an embodiment of the present disclosure;

[0061] Figure 7 Another viewing angle and brightness attenuation curve diagram provided by an embodiment of the present disclosure;

[0062] Figure 8 A spectrum diagram of another quantum dot layer provided in an embodiment of the present disclosure;

[0063] Fig. 9 Another viewing angle and brightness attenuation curve diagram provided by an embodiment of the present disclosure;

[0064] Fig.10 Another viewing angle and brightness attenuation curve diagram provided by an embodiment of the present disclosure;

[0065] Fig.11 Another viewing angle and brightness attenuation curve diagram provided by an embodiment of the present disclosure;

[0066] Fig.12 Another viewing angle and brightness attenuation curve diagram provided by an embodiment of the present disclosure;

[0067] Fig.13 Another viewing angle and brightness attenuation curve diagram provided by an embodiment of the present disclosure;

[0068] Fig.14 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0069] Fig.15 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0070] Fig.16 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0071] Fig.17 Another viewing angle and brightness attenuation curve diagram provided by an embodiment of the present disclosure;

[0072] Fig.18 A schematic diagram of the structure of a driving circuit layer provided in an embodiment of the present disclosure;

[0073] Fig.19 A schematic flow chart of a method for preparing a display panel provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0074] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. And in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0075] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0076] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, and are only intended to illustrate the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0077] In the related art, a non-pixelated blue OLED device is used as a backlight in a QD-OLED display product, and a quantum dot layer is arranged on the light-emitting side thereof, and the red and green quantum dots are excited by blue light to emit red and green light respectively; Figure 1 As shown, the quantum dot layer is composed of a mixture of a substrate MS, quantum dots QD, and scattering particles SP. This arrangement of the quantum dot layer has low blue light absorption and brightness conversion efficiency.

[0078] The present disclosure provides a display panel. Figure 2 to Figure 4 As shown, the display panel includes:

[0079] The base substrate 1 comprises a plurality of sub-pixel regions 101 arranged in an array along a first direction X and a second direction Y; the first direction X intersects the second direction Y;

[0080] A plurality of light emitting devices 2 are located on one side of the substrate 1; the light emitting devices 2 correspond to the sub-pixel areas 101 one by one;

[0081] The first pixel definition layer 3 is located on the side of the light emitting device 2 away from the substrate 1 and includes a first opening area 301 corresponding to the sub-pixel area 101;

[0082] A plurality of quantum dot layers 4 are located on the side of the light-emitting device 2 away from the substrate 1 and are located in at least part of the first opening area 301; the quantum dot layer 4 includes: a first sublayer 4-1, and a second sublayer 4-2 located on the side of the first sublayer 4-1 away from the substrate 1; the first sublayer 4-1 includes: a first substrate 401 and first quantum dots 402; the second sublayer 4-2 includes: a second substrate 403, and second quantum dots 404; the wavelength range of light emitted from the first sublayer 4-1 does not completely overlap with the wavelength range of light emitted from the second sublayer 4-2.

[0083] It should be noted that in the display panel provided by the embodiment of the present disclosure, the quantum dot layer is used to absorb the light emitted by the light emitting device to radiate light of a desired color. Specifically, the color of the light radiated by the quantum dot layer is the same as the color of the sub-pixel area corresponding to the quantum dot layer.

[0084] In the display panel provided by the embodiment of the present disclosure, the quantum dot layer includes a first sublayer and a second sublayer, and both the first sublayer and the second sublayer include quantum dots, so that the light emitted by the light-emitting device but not absorbed by the quantum dots of the first sublayer can be absorbed by the second quantum dots of the second sublayer after reaching the second sublayer to be converted into light corresponding to the color of the sub-pixel, which can improve the absorption rate of the light emitted by the light-emitting device and the brightness conversion efficiency. In addition, since the wavelength range of the light emitted by the first sublayer does not completely overlap with the wavelength range of the light emitted by the second sublayer, the spectral range of the light emitted by the sub-pixel can also be increased to improve the color purity.

[0085] It should be noted that the first quantum dots are dispersed in the first substrate, and the second quantum dots are dispersed in the second substrate.

[0086] In some embodiments, Figure 2 to Figure 4 As shown, the multiple sub-pixel regions 101 include: multiple red sub-pixel regions R, multiple blue sub-pixel regions B and multiple green sub-pixel regions G;

[0087] The light emitting device 2 is a blue light emitting device;

[0088] The multiple quantum dot layers 4 include: a red quantum dot layer r located in the first opening area 301 corresponding to the red sub-pixel area R, and a green quantum dot layer g located in the first opening area 301 corresponding to the green sub-pixel area G.

[0089] Specifically, Figure 2 to Figure 4As shown, a red light quantum dot layer r is arranged in the first opening area 5 corresponding to the red sub-pixel area R, and the red light quantum dot layer r absorbs blue light and radiates red light; a green light quantum dot layer g is arranged in the first opening area 5 corresponding to the green sub-pixel area G, and the green light quantum dot layer g absorbs blue light and radiates green light. Since the light-emitting device is a blue light-emitting device, the blue sub-pixel area B does not need to be provided with a quantum dot layer, and the display panel can also achieve full-color display.

[0090] In a specific implementation, the first quantum dots and the second quantum dots included in the red light quantum dot layer are both red light quantum dots that absorb blue light and radiate red light, and the first quantum dots and the second quantum dots included in the green light quantum dot layer are both green light quantum dots that absorb blue light and radiate red light.

[0091] In a specific implementation, the material of the quantum dot layer includes a core-shell quantum dot structure; the core material in the core-shell quantum dot structure may be, for example, cadmium selenide (CdSe) or indium phosphide (InP), and the shell material in the core-shell quantum dot structure may be, for example, zinc sulfide (ZnS).

[0092] In a specific implementation, in each quantum dot layer, the materials of the first quantum dots and the second quantum dots may be the same or different. The wavelength range of the light emitted from the first sublayer and the wavelength range of the light emitted from the second sublayer may be adjusted by adjusting the size of the first quantum dots and the second quantum dots, such as the diameter. The main wavelength of the light emitted from the first sublayer is also different from the main wavelength of the light emitted from the second sublayer. In a specific implementation, the wavelength range of the light emitted from the first sublayer and the second sublayer may be set according to actual needs. For example, the minimum value of the wavelength range of the light emitted from the first sublayer is smaller than the minimum value of the wavelength range of the light emitted from the second sublayer, and the maximum value of the wavelength range of the light emitted from the first sublayer is smaller than the maximum value of the wavelength range of the light emitted from the second sublayer.

[0093] In some embodiments, Figure 2 to Figure 4 As shown, the quantum dot layer further includes first scattering particles 405 , and the first sublayer 4 - 1 does not include the first scattering particles 405 , and the film layer including the first scattering particles 405 is located on the side of the first sublayer 4 - 1 away from the substrate 1 .

[0094] In the display panel provided by the embodiment of the present disclosure, the quantum dot layer further includes first scattering particles, thereby scattering light and improving the light output uniformity of the quantum dot layer.

[0095] It should be noted that although the quantum dot layer in the related art also includes scattering particles, the scattering particles are mixed with quantum dots to form a quantum dot layer. Some of the light radiated by the quantum dots may be directly emitted without being scattered by the scattering particles, or may not be evenly scattered by the scattering particles, which affects the uniformity of the light emitted by the quantum dot layer. This will cause the display panel to have a large percentage of brightness attenuation at a wide viewing angle, which affects the uniformity of the viewing angle brightness of the display product. The relationship curve between the viewing angle and the brightness attenuation of the light-emitting device in the related art and the relationship curve between the viewing angle and the brightness attenuation of the quantum dot layer in which scattering particles and quantum dots are mixed are shown in Figure 1. Figure 5 As shown in Table 1, the absorption rate Ab of the quantum dot layer to 460 nanometers (nm) blue light, the brightness conversion efficiency and the brightness attenuation L-decay at a viewing angle of 60° are shown. The blue light absorption rate and the brightness conversion efficiency of this setting of the quantum dot layer are not high. Although the viewing angle brightness attenuation is improved compared with the case where only the light-emitting device is set without the quantum dot layer, the brightness loss at a large viewing angle such as 60° is still large, which affects the brightness uniformity of the display panel.

[0096] Table 1

[0097]

[0098]

[0099] In the display panel provided by the embodiment of the present disclosure, the first quantum dot layer does not include the first scattering particles, that is, the first sublayer where the first quantum dots are located is independently provided with the film layer including the first scattering particles, and the film layer including the first scattering particles is located on the side of the first sublayer away from the substrate, so that the light emitted by the first quantum dot layer can be scattered and evenly dispersed by the first scattering particles. Compared with the situation in which the quantum dots and the scattering particles are completely mixed in the related art, the light uniformity of the quantum dot layer can be improved, and the brightness attenuation at a large viewing angle can be avoided, thereby improving the brightness uniformity of the display panel at a viewing angle.

[0100] In some embodiments, Figure 2 As shown, the second sub-layer 4-2 further includes first scattering particles 405. That is, the first scattering particles and the second quantum dots are mixed in the second substrate.

[0101] In some embodiments, the first scattering particles included in the quantum dot layer may be at least one of the following: titanium oxide (TiO2), zirconium oxide (ZrO2), aluminum oxide (Al2O3), indium oxide (In2O3), zinc oxide (ZnO), and tin oxide (SnO2).

[0102] In the display panel provided by the embodiment of the present disclosure, the first quantum dot layer does not include the first scattering particles, and the second sublayer includes the first scattering particles, the two are independently arranged, and the second sublayer is located on the side of the first sublayer away from the base substrate, so that the light emitted by the first quantum dot layer can be scattered and evenly dispersed by the first scattering particles of the second sublayer. Compared with the situation in which the quantum dots and scattering particles are completely mixed in the related art, the light emission uniformity of the quantum dot layer can be improved, and the excessive brightness attenuation at a large viewing angle can be avoided, thereby improving the viewing angle brightness uniformity of the display panel. In addition, the first scattering particles and the second quantum dots are mixed in the second substrate to form the second sublayer, which can achieve the improvement of the absorption rate of the light emitted by the light-emitting device and the brightness conversion efficiency, and improve the light emission uniformity, while avoiding too much increase in the production process of the quantum dot layer.

[0103] In some embodiments, Figure 2 As shown, in the direction perpendicular to the substrate 1 , the thickness h1 of the first sub-layer 4 - 1 is less than or equal to the thickness h2 of the second sub-layer 4 - 2 .

[0104] In some embodiments, Figure 2 As shown, in the direction perpendicular to the substrate 1, the ratio of the thickness h1-r of the first sublayer 4-1 included in the red light quantum dot layer 4 to the thickness h4 of the red light quantum dot layer 4 is greater than or equal to 1 / 10 and less than or equal to 1 / 2, and the ratio of the thickness h2-r of the second sublayer 4-2 included in the red light quantum dot layer 4 to the thickness h4 of the red light quantum dot layer 4 is greater than or equal to 1 / 2 and less than or equal to 9 / 10.

[0105] In some embodiments, the thickness h4 of the red light quantum dot layer is greater than or equal to 10 micrometers and less than or equal to 15 micrometers.

[0106] In some embodiments, in the red light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to the mass percentage of the second quantum dots in the second sublayer.

[0107] Furthermore, it can be set that the mass percentage of the first quantum dots in the first sublayer is greater than the mass percentage of the second quantum dots in the second sublayer. It should be noted that the mass percentages of quantum dots and first scattering particles affect the viscosity of the film layer. Since the first sublayer only includes the first substrate and the first quantum dots, the higher mass percentage of the first quantum dots can make the viscosity of the first sublayer meet the requirements and avoid the peeling and falling of the first sublayer. Since the second sublayer includes the first scattering particles in addition to the second quantum dots, reducing the mass percentage of the second quantum dots in the second sublayer compared to the first sublayer can also make the viscosity of the second sublayer meet the requirements.

[0108] In some embodiments, in the red light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 20% and less than or equal to 40%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 5% and less than or equal to 20%, and the mass percentage of the first scattering particles in the second sublayer is greater than or equal to 2% and less than or equal to 8%.

[0109] Specifically, in the red light quantum dot layer, the spectra of the first sublayer and the second sublayer are as follows: Figure 6 As shown, the first quantum dot of the first sublayer is excited and converted to red light with a main wavelength of 630 nanometers (nm), and a spectral wavelength range of 600-670nm. The second quantum dot of the second sublayer is excited and converted to red light with a main wavelength of 650nm, and a spectral wavelength range of 620-690nm. Figure 2 The display panel shown in FIG. 1 shows the absorption rate Ab of the red light quantum dot layer to 460 nanometer (nm) blue light, the brightness conversion efficiency, and the brightness decay L-decay at 60° viewing angle as shown in Table 2. Compared with the data in Table 1, the present disclosure Figure 2 The red light quantum dot layer shown in the figure has improved blue light absorption rate and brightness conversion efficiency, and the brightness attenuation at a large viewing angle, such as 60°, is reduced. In addition, the relationship curve between the viewing angle and the brightness attenuation of the red light quantum dot layer disclosed in the present invention and the relationship curve between the viewing angle and the brightness attenuation of the red light quantum dot layer in the related art are as shown in FIG. Figure 7 As shown, it can be seen that compared with the related art, the brightness attenuation of the red light quantum dot layer disclosed in the present invention from 0 to 60° is reduced, and the brightness uniformity under viewing angle can be improved.

[0110] Table 2

[0111] Quantum dot layer Abs Convert brightness L-decay Red light quantum dot layer 97％ 106％ 19％

[0112] In some embodiments, in a direction perpendicular to the substrate 1, the ratio of the thickness h1-g of the first sublayer 4-1 included in the green quantum dot layer 4 to the thickness h5 of the green quantum dot layer 4 is greater than or equal to 1 / 10 and less than or equal to 1 / 3, and the ratio of the thickness h2-g of the second sublayer 4-2 included in the green quantum dot layer 4 to the thickness h5 of the green quantum dot layer 4 is greater than or equal to 1 / 3 and less than or equal to 9 / 10.

[0113] In some embodiments, the thickness h5 of the green light quantum dot layer is greater than or equal to 10 micrometers and less than or equal to 15 micrometers. Figure 2 As shown, the thickness h4 of the red light quantum dot layer is equal to the thickness h5 of the green light quantum dot layer.

[0114] In some embodiments, in the green light quantum dot layer, the mass percentage of the first quantum dot in the first sublayer is greater than or equal to 30% and less than or equal to 55%, the mass percentage of the second quantum dot in the second sublayer is greater than or equal to 10% and less than or equal to 40%, and the mass percentage of the first scattering particle in the second sublayer is greater than or equal to 4% and less than or equal to 8%; in the green light quantum dot layer, the spectra of the first sublayer and the second sublayer are as follows: Figure 8 As shown, the green light converted from the first quantum dot of the first sublayer after being excited has a main wavelength of 540 nanometers (nm) and a spectral wavelength range of 510 to 570 nm, and the green light converted from the second quantum dot of the second sublayer after being excited has a main wavelength of 560 nm and a spectral wavelength range of 530 to 590 nm. Figure 2 The display panel shown in FIG. 1 shows the absorption rate Ab of the green light quantum dot layer to 460 nanometer (nm) blue light, the brightness conversion efficiency, and the brightness decay L-decay at 60° viewing angle as shown in Table 3. Compared with the data in Table 1, the present disclosure Figure 2 The green light quantum dot layer shown in the figure has improved blue light absorption rate and brightness conversion efficiency, and the brightness attenuation at a large viewing angle, such as 60°, is reduced. In addition, the relationship curve between the viewing angle and the brightness attenuation of the green light quantum dot layer disclosed in the present invention and the relationship curve between the viewing angle and the brightness attenuation of the green light quantum dot layer in the related art are shown in FIG. Fig. 9 As shown, it can be seen that compared with the related art, the brightness attenuation of the red light quantum dot layer disclosed in the present invention from 0 to 60° is reduced, and the brightness uniformity under viewing angle can be improved.

[0115] Table 3

[0116] Quantum dot layer Abs Convert brightness L-decay Green light quantum dot layer 97％ 110％ 19％

[0117] It should be noted that, in a specific implementation, in the green light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer may be greater than the mass percentage of the second quantum dots in the second sublayer.

[0118] Or, in some embodiments, Figure 3 or Figure 4 As shown, the quantum dot layer 4 further includes: a third sublayer 4 - 3 located on the side of the first sublayer 4 - 1 away from the substrate 1 ; the third sublayer 4 - 3 includes a third base material 406 and first scattering particles 405 .

[0119] That is, in the display panel provided by the embodiment of the present disclosure, in the quantum dot layer, the film layer containing the first quantum dots, the film layer containing the second quantum dots, and the film layer containing the first scattering particles are all independently arranged.

[0120] In some embodiments, Figure 3 As shown, the second sublayer 4-2 is located between the first sublayer 4-1 and the third sublayer 4-3.

[0121] Therefore, the blue light not absorbed by the first sublayer can be absorbed by the second sublayer and converted into light corresponding to the sub-pixel color, and then can be scattered by the first scattering particles after passing through the third sublayer and evenly dispersed, thereby improving the absorption rate of light emitted by the light-emitting device and the brightness conversion efficiency while improving the uniformity of light output.

[0122] Or, in some embodiments, Figure 3 As shown, the third sublayer 4-3 is located between the first sublayer 4-1 and the second sublayer 4-2.

[0123] Thus, the light reaching the third sublayer can be scattered by the first scattering particles and evenly dispersed, thereby improving the uniformity of light output. The second sublayer including the second quantum dots is located on the side of the third sublayer away from the first sublayer, so that the unabsorbed blue light can be absorbed by the second sublayer and converted into light corresponding to the sub-pixel color, thereby improving the uniformity of light output while improving the absorption rate of light emitted by the light-emitting device and the brightness conversion efficiency.

[0124] In some embodiments, Figure 3 or Figure 4 As shown, in the direction perpendicular to the substrate 1, the thickness h1 of the first sublayer 4-1 is less than or equal to the thickness h6 of the third sublayer 4-3, and the thickness h2 of the second sublayer 4-2 is less than or equal to the thickness h6 of the third sublayer 4-3.

[0125] In some embodiments, Figure 3 or Figure 4 As shown, in the direction perpendicular to the substrate 1, the ratio of the thickness h1-r of the first sublayer 4-1 included in the red light quantum dot layer 4 to the thickness h4 of the red light quantum dot layer 4 is greater than or equal to 1 / 10 and less than or equal to 1 / 3, the ratio of the thickness h6-r of the third sublayer 4-3 included in the red light quantum dot layer 4 to the thickness h4 of the red light quantum dot layer 4 is greater than or equal to 1 / 3 and less than or equal to 4 / 5, and the ratio of the thickness h2-r of the second sublayer 4-2 included in the red light quantum dot layer 4 to the thickness h4 of the red light quantum dot layer 4 is greater than or equal to 1 / 10 and less than or equal to 1 / 3.

[0126] In some embodiments, Figure 3 or Figure 4 As shown, in the direction perpendicular to the substrate 1, the ratio of the thickness h1-g of the first sublayer 4-1 included in the green quantum dot layer 4 to the thickness h5 of the green quantum dot layer 4 is greater than or equal to 1 / 5 and less than or equal to 1 / 3, the ratio of the thickness h6-g of the third sublayer 4-3 included in the green quantum dot layer 4 to the thickness h5 of the green quantum dot layer 4 is greater than or equal to 1 / 3 and less than or equal to 2 / 5, and the ratio of the thickness h2-g of the second sublayer 4-2 included in the green quantum dot layer 4 to the thickness h5 of the green quantum dot layer 4 is greater than or equal to 1 / 3 and less than or equal to 2 / 5.

[0127] In some embodiments, the thickness h4 of the red light quantum dot layer and the thickness h5 of the green light quantum dot layer are greater than or equal to 10 micrometers and less than or equal to 15 micrometers. Figure 3 or Figure 4 As shown, the thickness h4 of the red light quantum dot layer is equal to the thickness h5 of the green light quantum dot layer.

[0128] In some embodiments, in the red light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 20% and less than or equal to 40%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 5% and less than or equal to 20%, and the mass percentage of the first scattering particles in the third sublayer is greater than or equal to 2% and less than or equal to 8%;

[0129] In the green light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 30% and less than or equal to 55%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 10% and less than or equal to 40%, and the mass percentage of the first scattering particles in the third sublayer is greater than or equal to 4% and less than or equal to 10%.

[0130] Specifically, for Figure 3 The red light quantum dot layer shown, the spectra of the first sublayer and the second sublayer are as follows Figure 6 As shown, the first quantum dot of the first sublayer is excited and converted to red light with a main wavelength of 630 nanometers (nm), and a spectral wavelength range of 600-670nm. The second quantum dot of the second sublayer is excited and converted to red light with a main wavelength of 650nm, and a spectral wavelength range of 620-690nm. Figure 3 The display panel shown in FIG. 1 shows the absorption rate Ab of the red light quantum dot layer to 460 nanometer (nm) blue light, the brightness conversion efficiency, and the brightness decay L-decay at 60° viewing angle as shown in Table 4. Compared with the data in Table 1, the present disclosure Figure 3 The red light quantum dot layer shown in the figure has improved blue light absorption rate and brightness conversion efficiency, and the brightness attenuation at a large viewing angle, such as 60°, is reduced. In addition, the relationship curve between the viewing angle and the brightness attenuation of the red light quantum dot layer disclosed in the present invention and the relationship curve between the viewing angle and the brightness attenuation of the red light quantum dot layer in the related art are as shown in FIG. Fig.10 As shown, it can be seen that compared with the related art, the brightness attenuation of the red light quantum dot layer disclosed in the present invention from 0 to 60 degrees is reduced, which can improve the uniformity of viewing angle brightness. And compared with Table 2, the blue light absorption rate and brightness conversion efficiency are further improved, and the brightness attenuation at 60 degrees is further reduced.

[0131] Table 4

[0132] Quantum dot layer Abs Convert brightness L-decay Red light quantum dot layer 99％ 108％ 15％

[0133] Specifically, for Figure 3 In the green light quantum dot layer shown, the spectra of the first sublayer and the second sublayer are as follows Figure 8 As shown, the green light converted from the first quantum dot of the first sublayer after being excited has a main wavelength of 540 nanometers (nm) and a spectral wavelength range of 510 to 570 nm, and the green light converted from the second quantum dot of the second sublayer after being excited has a main wavelength of 560 nm and a spectral wavelength range of 530 to 590 nm. Figure 3 The display panel shown in FIG. 1 shows the absorption rate Ab of the green light quantum dot layer to 460 nanometer (nm) blue light, the brightness conversion efficiency, and the brightness attenuation L-decay at 60° viewing angle as shown in Table 5. Compared with the data in Table 1, the present disclosure Figure 3 The green light quantum dot layer shown in the figure has improved blue light absorption rate and brightness conversion efficiency, and the brightness attenuation at a large viewing angle, such as 60°, is reduced. In addition, the relationship curve between the viewing angle and the brightness attenuation of the green light quantum dot layer disclosed in the present invention and the relationship curve between the viewing angle and the brightness attenuation of the green light quantum dot layer in the related art are shown in FIG. Fig.11 As shown, it can be seen that compared with the related art, the brightness attenuation of the red light quantum dot layer disclosed in the present invention from 0 to 60 degrees is reduced, which can improve the uniformity of viewing angle brightness. And compared with Table 3, the blue light absorption rate and brightness conversion efficiency are further improved, and the brightness attenuation at 60 degrees is further reduced.

[0134] Table 5

[0135] Quantum dot layer Abs Convert brightness L-decay Green light quantum dot layer 98％ 112％ 14％

[0136] Specifically, for Figure 4 The red light quantum dot layer shown, the spectra of the first sublayer and the second sublayer are as follows Figure 6 As shown, the first quantum dot of the first sublayer is excited and converted to red light with a main wavelength of 630 nanometers (nm), and a spectral wavelength range of 600-670nm. The second quantum dot of the second sublayer is excited and converted to red light with a main wavelength of 650nm, and a spectral wavelength range of 620-690nm. Figure 4 The display panel shown in FIG. 1 shows the absorption rate Ab of the red light quantum dot layer to 460 nanometer (nm) blue light, the brightness conversion efficiency, and the brightness decay L-decay at 60° viewing angle as shown in Table 6. Compared with the data in Table 1, the present disclosure shows Figure 4 The red light quantum dot layer shown in the figure has improved blue light absorption rate and brightness conversion efficiency, and the brightness attenuation at a large viewing angle, such as 60°, is reduced. In addition, the relationship curve between the viewing angle and the brightness attenuation of the red light quantum dot layer disclosed in the present invention and the relationship curve between the viewing angle and the brightness attenuation of the red light quantum dot layer in the related art are as shown in FIG. Fig.12As shown, it can be seen that compared with the related art, the brightness attenuation of the red light quantum dot layer disclosed in the present invention from 0 to 60° is reduced, which can improve the uniformity of viewing angle brightness. Compared with Table 2, the blue light absorption rate and brightness conversion efficiency are further improved, and the brightness attenuation at 60° is further reduced. Compared with Table 4, the brightness attenuation at 60° is further reduced.

[0137] Table 6

[0138] Quantum dot layer Abs Convert brightness L-decay Red light quantum dot layer 99％ 108％ 10％

[0139] Specifically, for Figure 4 In the green light quantum dot layer shown, the spectra of the first sublayer and the second sublayer are as follows Figure 8 As shown, the green light converted from the first quantum dot of the first sublayer after being excited has a main wavelength of 540 nanometers (nm) and a spectral wavelength range of 510 to 570 nm, and the green light converted from the second quantum dot of the second sublayer after being excited has a main wavelength of 560 nm and a spectral wavelength range of 530 to 590 nm. Figure 4 The display panel shown in FIG. 1 shows the absorption rate Ab of the green light quantum dot layer to 460 nanometer (nm) blue light, the brightness conversion efficiency, and the brightness decay L-decay at 60° viewing angle as shown in Table 7. Compared with the data in Table 1, the present disclosure Figure 4 The green light quantum dot layer shown in the figure has improved blue light absorption rate and brightness conversion efficiency, and the brightness attenuation at a large viewing angle, such as 60°, is reduced. In addition, the relationship curve between the viewing angle and the brightness attenuation of the green light quantum dot layer disclosed in the present invention and the relationship curve between the viewing angle and the brightness attenuation of the green light quantum dot layer in the related art are shown in FIG. Fig.13 As shown, it can be seen that compared with the related art, the brightness attenuation of the red light quantum dot layer disclosed in the present invention from 0 to 60° is reduced, which can improve the uniformity of viewing angle brightness. Compared with Table 3, the blue light absorption rate and brightness conversion efficiency are further improved, and the brightness attenuation at 60° is further reduced. Compared with Table 5, the brightness attenuation at 60° is further reduced.

[0140] Table 7

[0141] Quantum dot layer Abs Convert brightness L-decay Green light quantum dot layer 98％ 112％ 8％

[0142] In some embodiments, Figure 2 to Figure 4 , Figure 14 to Figure 16 As shown, the display panel further includes: a scattering layer 8 in the first opening area 301 corresponding to the blue sub-pixel area B; the scattering layer 8 includes second scattering particles. Thus, the light emitted by the light emitting device can be scattered when reaching the scattering layer, which is beneficial to improve the uniformity of light output.

[0143] That is, the first opening area where the quantum dot layer is not provided is filled with the scattering layer. In a specific implementation, the scattering layer is a light-transmitting film layer.

[0144] It should be noted that if Figure 2 to Figure 4 As shown, the scattering layer 8 in the first opening area 301 corresponding to the blue sub-pixel area B is a single layer, and the thickness of the scattering layer 8 is relatively thick. When manufacturing the scattering layer, scattering particles may agglomerate, affecting the distribution uniformity of the scattering particles, and further affecting the uniformity of the scattering of the light emitted by the light-emitting device by the scattering layer.

[0145] In some embodiments, Figure 14 to Figure 16 As shown, the scattering layer 8 includes: a plurality of stacked scattering sub-layers 801; the scattering sub-layers 801 include: a third substrate 406 and second scattering particles 8011; and the plurality of scattering sub-layers 801 are formed in different process steps.

[0146] That is, in the display panel provided by the embodiment of the present disclosure, the scattering layer is formed by multiple manufacturing processes. Since each scattering sub-layer is thinner than the entire scattering layer, this can avoid the problem of the second scattering particles agglomerating and affecting their distribution uniformity due to the thick film layer, and can further improve the light uniformity, thereby improving the viewing angle brightness uniformity.

[0147] Specifically, the relationship curve between the viewing angle and the brightness attenuation of a single-layer scattering layer and the relationship curve between the viewing angle and the brightness attenuation of a scattering layer including multiple scattering sub-layers are as follows: Fig.17 As shown, it can be concluded that, compared with the implementation of a single-layer scattering layer, when the scattering layer includes multiple scattering sub-layers, the brightness attenuation at 0 to 60° is reduced, which can improve the brightness uniformity at viewing angles.

[0148] In some embodiments, Figure 14 to Figure 16 As shown, the multi-layer scattering sub-layer 801 includes: a first scattering sub-layer 801-1801 and a second scattering sub-layer 801-2801 located on a side of the first scattering sub-layer 801-1801 away from the substrate 1;

[0149] In a direction perpendicular to the substrate 1 , a thickness h7 of the first scattering sublayer 801 - 1 801 is less than or equal to a thickness h8 of the second scattering sublayer 801 - 2 801 .

[0150] In some embodiments, Figure 14 to Figure 16 As shown, in the direction perpendicular to the substrate 1, the ratio of the thickness h7 of the first scattering sublayer 801-1801 to the thickness h9 of the scattering layer 8 is greater than or equal to 1 / 3 and less than or equal to 1 / 2, and the ratio of the thickness h8 of the second scattering sublayer 801-2801 to the thickness h9 of the scattering layer 8 is greater than or equal to 1 / 2 and less than or equal to 2 / 3.

[0151] In a specific implementation, the thickness h9 of the scattering layer is equal to the thickness of the quantum dot layer. The thickness h9 of the scattering layer is greater than or equal to 10 micrometers and less than or equal to 15 micrometers.

[0152] In some embodiments, the mass percentage of the second scattering particles in the first scattering sublayer is greater than or equal to 4% and less than or equal to 10%;

[0153] The mass percentage of the second scattering particles in the first scattering sublayer is greater than or equal to 2% and less than or equal to 6%.

[0154] In some embodiments, the second scattering particles included in the scattering may be at least one of the following: titanium oxide (TiO2), zirconium oxide (ZrO2), aluminum oxide (Al2O3), indium oxide (In2O3), zinc oxide (ZnO) or tin oxide (SnO2).

[0155] In a specific implementation, the first filling structure and the first pixel definition layer may both include resin materials. The first pixel definition layer includes a light-shielding resin material, and the first substrate, the second substrate, and the third substrate are light-transmitting resin materials. In a specific implementation, the materials of the first substrate, the second substrate, and the third substrate may be the same.

[0156] In some embodiments, the light emitting device is an electroluminescent device. The electroluminescent device is, for example, an organic light emitting diode device. Alternatively, the electroluminescent device may also be other light emitting devices such as Micro LED and Mini LED.

[0157] Next, an OLED light-emitting device is used as an example for explanation.

[0158] like Figure 2 to Figure 4 , Figure 14 to Figure 16 As shown, the display panel further includes: a driving circuit layer 5 located between the base substrate 1 and the light emitting device 3, a second pixel definition layer 6 located between the driving circuit layer 5 and the first pixel definition layer 3, and an encapsulation layer 7 between the light emitting device 3 and the first pixel definition layer 3. The second pixel definition layer 6 includes a second opening area 601 corresponding to the sub-pixel area 101 one by one; the light emitting device 3 includes an anode 201, a light emitting function layer 202, and a cathode 203 sequentially stacked in the second opening area 601, wherein the anode 201 is located between the second pixel definition layer 6 and the driving circuit layer 5, the second pixel definition layer 6 covers the edge of the anode 201, and the cathodes 203 corresponding to the plurality of sub-pixel areas 101 are integrally connected.

[0159] In some embodiments, the display panel may further include a light extraction layer between the cathode and the encapsulation layer.

[0160] In a specific implementation, the driving circuit layer includes a plurality of pixel driving circuits arranged in an array; the pixel driving circuit is used to drive the light-emitting device to emit light; Fig.18As shown, the pixel driving circuit includes a thin film transistor TFT and a storage capacitor (not shown); the thin film transistor TFT includes: an active layer 501, a gate G, a source S and a drain D; Fig.18 In the description, the thin film transistor TFT is taken as a top gate structure as an example, of course, the thin film transistor TFT can also be a bottom gate or other structure. Fig.18 As shown, the display substrate further includes: a buffer layer 9 located between the base substrate 1 and the active layer 501; the driving circuit layer 5 further includes: a first gate insulating layer 502 located between the active layer 501 and the gate G, an interlayer insulating layer 503 located between the first gate insulating layer 502 and the source S and the drain D, and a planarization layer 504 located between the light emitting device 3 and the source S and the drain D. The anode 201 is connected to the drain D through a via hole penetrating the planarization layer 504.

[0161] In a specific implementation, the light-emitting functional layer includes an organic light-emitting layer, and may also include an electron injection layer, an electron transport layer, a hole transport layer, a hole injection layer, and the like.

[0162] In a specific implementation, when all the light-emitting devices are blue light-emitting devices, the organic light-emitting layers corresponding to each sub-pixel region emit blue light, but the light-emitting spectra of the organic light-emitting layers corresponding to each sub-pixel region may be the same or different.

[0163] In some embodiments, Figure 2 to Figure 4 , Figure 14 to Figure 16 As shown, the encapsulation layer 7 includes: a first inorganic encapsulation film 701 , an organic encapsulation film 702 , and a second inorganic encapsulation film 703 which are stacked.

[0164] The present disclosure provides a method for manufacturing a display panel, such as Fig.19 As shown, including:

[0165] S101, providing a substrate; the substrate comprises a plurality of sub-pixel regions arranged in an array along a first direction and a second direction; the first direction intersects the second direction;

[0166] S102, forming a plurality of light-emitting devices on one side of the substrate; the light-emitting devices correspond to the sub-pixel areas one by one;

[0167] S103, forming a pattern of a first pixel definition layer on a side of the light emitting device away from the substrate; the first pixel definition layer includes first opening areas corresponding to the sub-pixel areas one by one;

[0168] S104. Form a quantum dot layer in at least part of the first opening area; the quantum dot layer includes: a first sublayer, and a second sublayer located on the side of the first sublayer away from the substrate; the first sublayer includes: a first substrate and first quantum dots; the second sublayer includes: a second substrate and second quantum dots; the wavelength range of light emitted from the first sublayer does not completely overlap with the wavelength range of light emitted from the second sublayer.

[0169] In the method for preparing a display panel provided by the embodiment of the present disclosure, the first quantum dot layer first formed in the quantum dot layer does not include the first scattering particles, and the second sublayer includes the first scattering particles, the two are independently arranged, and the second sublayer is located on the side of the first sublayer away from the substrate, so that the light emitted by the first quantum dot layer can be scattered and evenly dispersed by the first scattering particles of the second sublayer. Compared with the situation in which the quantum dots and scattering particles are completely mixed in the related art, the light uniformity of the quantum dot layer can be improved, and the excessive brightness attenuation at a large viewing angle can be avoided, thereby improving the viewing angle brightness uniformity of the display panel. In addition, the first scattering particles and the second quantum dots are mixed with the second substrate to form the second sublayer, which can achieve the improvement of the absorption rate of the light emitted by the light-emitting device and the brightness conversion efficiency, and improve the light uniformity, while avoiding too much increase in the production process of the quantum dot layer.

[0170] In some embodiments, forming a quantum dot layer specifically includes:

[0171] forming a first sublayer including first quantum dots;

[0172] A second sublayer including first scattering particles and second quantum dots is formed on the side of the first sublayer facing away from the substrate.

[0173] In a specific implementation, the first sub-layer and the second sub-layer may be formed by an inkjet printing process.

[0174] In some embodiments, in the step of forming the first sublayer, the first substrate and the first quantum dot material are evenly mixed to obtain ink for the first sublayer, and then the ink for the first sublayer is printed in the first opening area by an inkjet printing process to form the first sublayer.

[0175] In some embodiments, in the step of forming the second sublayer, the second substrate, the first scattering particles and the second quantum dot material are evenly mixed to obtain the ink of the second sublayer, and then the ink of the second sublayer is printed on the first sublayer by an inkjet printing process to form the second sublayer.

[0176] In some embodiments, forming a quantum dot layer specifically includes:

[0177] forming a first sublayer including first quantum dots;

[0178] forming a third sublayer including first scattering particles on a side of the first sublayer facing away from the substrate;

[0179] A second sublayer including second quantum dots is formed on the side of the third sublayer facing away from the first sublayer.

[0180] In a specific implementation, the first sub-layer, the third sub-layer, and the second sub-layer may be formed by an inkjet printing process.

[0181] In some embodiments, in the step of forming the first sublayer, the first substrate and the first quantum dot material are evenly mixed to obtain ink for the first sublayer, and then the ink for the first sublayer is printed in the first opening area by an inkjet printing process to form the first sublayer.

[0182] In some embodiments, in the step of forming the third sublayer, the third substrate and the first scattering particles are evenly mixed to obtain ink for the third sublayer, and then the ink for the third sublayer is printed on the first sublayer by an inkjet printing process to form the third sublayer.

[0183] In some embodiments, in the step of forming the second sublayer, the second substrate and the second quantum dot material are evenly mixed to obtain ink for the second sublayer, and then the ink for the second sublayer is printed on the third sublayer by an inkjet printing process to form the second sublayer.

[0184] In some embodiments, forming a quantum dot layer specifically includes:

[0185] forming a first sublayer including first quantum dots;

[0186] Forming a first type of second sublayer including second quantum dots on a side of the first sublayer away from the substrate;

[0187] A third sublayer including first scattering particles is formed on a side of the second sublayer facing away from the first sublayer.

[0188] In a specific implementation, the first sub-layer, the second sub-layer, and the third sub-layer may be formed by an inkjet printing process.

[0189] In some embodiments, in the step of forming the first sublayer, the first substrate and the first quantum dot material are evenly mixed to obtain ink for the first sublayer, and then the ink for the first sublayer is printed in the first opening area by an inkjet printing process to form the first sublayer.

[0190] In some embodiments, in the step of forming the second sublayer, the second substrate, the first scattering particles and the second quantum dot material are evenly mixed to obtain the ink of the second sublayer, and then the ink of the second sublayer is printed on the first sublayer by an inkjet printing process to form the second sublayer.

[0191] In some embodiments, in the step of forming the third sublayer, the third substrate and the first scattering particles are evenly mixed to obtain ink for the third sublayer, and then the ink for the third sublayer is printed on the second sublayer by an inkjet printing process to form the third sublayer.

[0192] In some embodiments, the plurality of sub-pixel regions include: a plurality of blue sub-pixel regions; and further include:

[0193] Multiple scattering sub-layers are sequentially formed in the first opening area corresponding to the blue sub-pixel area.

[0194] That is, in the method for preparing the display panel provided in the embodiment of the present disclosure, the scattering layer is formed by being manufactured multiple times. Since each scattering sub-layer is thinner than the entire scattering layer, this can avoid the problem of the second scattering particles agglomerating and affecting their distribution uniformity due to the thick film layer, and can further improve the light uniformity, thereby improving the uniformity of the brightness under the viewing angle.

[0195] In a specific implementation, the scattering sub-layer may be coated by a coating process, and then the scattering sub-layer may be cured to complete the production of a single-layer scattering sub-layer.

[0196] Alternatively, in a specific implementation, multiple scattering sub-layers may be formed sequentially by an inkjet printing process.

[0197] In some embodiments, before forming a plurality of light emitting devices on one side of the substrate, the method further includes:

[0198] forming a buffer layer on one side of the substrate;

[0199] A driving circuit layer is formed on a side of the buffer layer away from the base substrate.

[0200] In some embodiments, forming a driving circuit layer specifically includes:

[0201] Sequentially forming patterns of an active layer, a gate insulating layer, a gate electrode, an interlayer insulating layer, and a source electrode and a drain electrode;

[0202] A pattern of a planarization layer is formed on the side of the source and drain electrodes facing away from the substrate.

[0203] In some embodiments, a plurality of light emitting devices are formed on one side of the substrate, specifically including:

[0204] forming a pattern of a plurality of anodes on a side of the planarization layer facing away from the substrate;

[0205] A pattern of a second pixel definition layer is formed on the side of the anode away from the substrate; the second pixel definition layer includes a second opening area, and the orthographic projection of the second opening area on the substrate falls within the orthographic projection of the anode on the substrate;

[0206] forming a light-emitting functional layer on a side of the anode facing away from the substrate;

[0207] A cathode is formed on the side of the light emitting functional layer facing away from the substrate.

[0208] In some embodiments, after forming the cathode, the method further comprises:

[0209] A first inorganic encapsulation film, an organic encapsulation film, and a second inorganic encapsulation film are formed in sequence.

[0210] A display device provided by an embodiment of the present disclosure includes the display panel provided by an embodiment of the present disclosure.

[0211] The display device provided in the embodiment of the present disclosure is any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, etc. Other essential components of the display device should be understood by a person skilled in the art, and will not be described in detail here, nor should they be used as a limitation of the present disclosure. The implementation of the display device can refer to the embodiment of the display panel above, and the repeated parts will not be described in detail.

[0212] In summary, in the display panel and its preparation method and display device provided by the embodiments of the present disclosure, the first quantum dot layer does not include the first scattering particles, and the second sublayer includes the first scattering particles, the two are independently arranged, and the second sublayer is located on the side of the first sublayer away from the base substrate, so that the light emitted by the first quantum dot layer can be scattered and evenly dispersed by the first scattering particles of the second sublayer. Compared with the situation in which the quantum dots and scattering particles are completely mixed in the related art, the light emission uniformity of the quantum dot layer can be improved, and the excessive brightness attenuation at a large viewing angle can be avoided, thereby improving the viewing angle brightness uniformity of the display panel. In addition, the first scattering particles and the second quantum dots are mixed in the second substrate to form the second sublayer, which can achieve the improvement of the absorption rate of the light emitted by the light-emitting device and the brightness conversion efficiency, and improve the light emission uniformity, while avoiding too much increase in the production process of the quantum dot layer.

[0213] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0214] Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

1. A display panel, wherein: The display panel comprises: A substrate, comprising a plurality of sub-pixel regions arranged in an array along a first direction and a second direction; the first direction intersects the second direction; A plurality of light emitting devices are located on one side of the base substrate; the light emitting devices correspond to the sub-pixel areas one by one; A first pixel definition layer, located on a side of the light emitting device away from the substrate, comprising first opening areas corresponding to the sub-pixel areas one by one; A plurality of quantum dot layers are located on a side of the light-emitting device away from the substrate and within at least a portion of the first opening area; the quantum dot layer comprises: a first sublayer and a second sublayer located on a side of the first sublayer away from the substrate; the first sublayer comprises: a first substrate and first quantum dots; the second sublayer comprises: a second substrate and second quantum dots; the wavelength range of light emitted from the first sublayer does not completely overlap with the wavelength range of light emitted from the second sublayer.

2. The display panel according to claim 1, wherein: The second sublayer further includes first scattering particles.

3. The display panel according to claim 2, wherein: In a direction perpendicular to the substrate, a thickness of the first sub-layer is less than or equal to a thickness of the second sub-layer.

4. The display panel according to claim 1, wherein: The quantum dot layer further includes: a third sublayer located on a side of the first sublayer away from the substrate; the third sublayer includes a third base material and first scattering particles.

5. The display panel according to claim 4, wherein: The third sublayer is located between the first sublayer and the second sublayer.

6. The display panel according to claim 4, wherein: The second sublayer is located between the first sublayer and the third sublayer.

7. The display panel according to any one of claims 4 to 6, wherein: In a direction perpendicular to the base substrate, the thickness of the first sub-layer is less than or equal to the thickness of the third sub-layer, and the thickness of the second sub-layer is less than or equal to the thickness of the third sub-layer.

8. The display panel according to any one of claims 1 to 6, wherein: The plurality of sub-pixel regions include: a plurality of red sub-pixel regions, a plurality of blue sub-pixel regions and a plurality of green sub-pixel regions; The light emitting device is a blue light emitting device; The multiple quantum dot layers include: a red light quantum dot layer located in the first opening area corresponding to the red sub-pixel area, and a green light quantum dot layer located in the first opening area corresponding to the green sub-pixel area.

9. The display panel according to claim 8, wherein: The second sublayer further includes first scattering particles; in the red light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 20% and less than or equal to 40%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 5% and less than or equal to 20%, and the mass percentage of the first scattering particles in the second sublayer is greater than or equal to 2% and less than or equal to 8%; In the green light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 30% and less than or equal to 55%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 10% and less than or equal to 40%, and the mass percentage of the first scattering particles in the second sublayer is greater than or equal to 4% and less than or equal to 8%.

10. The display panel according to claim 9, wherein: In a direction perpendicular to the substrate, a ratio of a thickness of the first sublayer included in the red light quantum dot layer to a thickness of the red light quantum dot layer is greater than or equal to 1 / 10 and less than or equal to 1 / 2, and a ratio of a thickness of the second sublayer included in the red light quantum dot layer to a thickness of the red light quantum dot layer is greater than or equal to 1 / 2 and less than or equal to 9 / 10; In a direction perpendicular to the substrate, the ratio of the thickness of the first sublayer included in the green light quantum dot layer to the thickness of the green light quantum dot layer is greater than or equal to 1 / 10 and less than or equal to 1 / 3, and the ratio of the thickness of the second sublayer included in the green light quantum dot layer to the thickness of the green light quantum dot layer is greater than or equal to 1 / 3 and less than or equal to 9 / 10.

11. The display panel according to claim 7, wherein: The quantum dot layer further includes a third sublayer; In the red light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 20% and less than or equal to 40%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 5% and less than or equal to 20%, and the mass percentage of the first scattering particles in the third sublayer is greater than or equal to 2% and less than or equal to 8%; In the green light quantum dot layer, the mass percentage of the first quantum dots in the first sublayer is greater than or equal to 30% and less than or equal to 55%, the mass percentage of the second quantum dots in the second sublayer is greater than or equal to 10% and less than or equal to 40%, and the mass percentage of the first scattering particles in the third sublayer is greater than or equal to 4% and less than or equal to 10%.

12. The display panel according to claim 11, wherein: In a direction perpendicular to the substrate, a ratio of a thickness of the first sublayer included in the red light quantum dot layer to a thickness of the red light quantum dot layer is greater than or equal to 1 / 10 and less than or equal to 1 / 3, a ratio of a thickness of the third sublayer included in the red light quantum dot layer to a thickness of the red light quantum dot layer is greater than or equal to 1 / 3 and less than or equal to 4 / 5, and a ratio of a thickness of the second sublayer included in the red light quantum dot layer to a thickness of the red light quantum dot layer is greater than or equal to 1 / 10 and less than or equal to 1 / 3; In a direction perpendicular to the substrate, the ratio of the thickness of the first sublayer included in the green quantum dot layer to the thickness of the green quantum dot layer is greater than or equal to 1 / 5 and less than or equal to 1 / 3, the ratio of the thickness of the third sublayer included in the green quantum dot layer to the thickness of the green quantum dot layer is greater than or equal to 1 / 3 and less than or equal to 2 / 5, and the ratio of the thickness of the second sublayer included in the green quantum dot layer to the thickness of the green quantum dot layer is greater than or equal to 1 / 3 and less than or equal to 2 / 5.

13. The display panel according to claim 7, wherein: The display panel further includes: a scattering layer in the first opening area corresponding to the blue sub-pixel area; The scattering layer comprises: a plurality of scattering sub-layers stacked in layers; the scattering sub-layers comprise: a third substrate and second scattering particles; and the plurality of scattering sub-layers are formed in different process steps.

14. The display panel according to claim 13, wherein: The multi-layer scattering sublayer comprises: a first scattering sublayer and a second scattering sublayer located on a side of the first scattering sublayer away from the substrate; In a direction perpendicular to the substrate, a thickness of the first scattering sublayer is less than or equal to a thickness of the second scattering sublayer.

15. The display panel according to claim 14, wherein: In a direction perpendicular to the base substrate, a ratio of a thickness of the first scattering sublayer to a thickness of the scattering layer is greater than or equal to 1 / 3 and less than or equal to 1 / 2, and a ratio of a thickness of the second scattering sublayer to a thickness of the scattering layer is greater than or equal to 1 / 2 and less than or equal to 2 / 3.

16. The display panel according to claim 15, wherein: The mass percentage of the second scattering particles in the first scattering sublayer is greater than or equal to 4% and less than or equal to 10%; The mass percentage of the second scattering particles in the first scattering sublayer is greater than or equal to 2% and less than or equal to 6%.

17. A method for preparing a display panel, wherein: The method comprises: Providing a substrate; the substrate comprising a plurality of sub-pixel regions arranged in an array along a first direction and a second direction; the first direction intersects the second direction; A plurality of light emitting devices are formed on one side of the base substrate; the light emitting devices correspond to the sub-pixel areas one by one; A pattern of a first pixel definition layer is formed on a side of the light emitting device away from the substrate; the first pixel definition layer includes first opening areas corresponding to the sub-pixel areas one by one; A quantum dot layer is formed in at least a portion of the first opening area; the quantum dot layer includes: a first sublayer, and a second sublayer located on the side of the first sublayer away from the substrate; the first sublayer includes: a first substrate and first quantum dots; the second sublayer includes: a second substrate and second quantum dots; the wavelength range of light emitted from the first sublayer does not completely overlap with the wavelength range of light emitted from the second sublayer.

18. The method according to claim 17, wherein: Forming a quantum dot layer specifically includes: forming a first sublayer including the first quantum dots; A second sublayer including first scattering particles and the second quantum dots is formed on a side of the first sublayer away from the substrate.

19. The method according to claim 17, wherein: Forming a quantum dot layer specifically includes: forming a first sublayer including the first quantum dots; forming a third sublayer including the first scattering particles on a side of the first sublayer facing away from the substrate; A second sublayer including the second quantum dots is formed on a side of the third sublayer facing away from the first sublayer.

20. The method according to claim 17, wherein: Forming a quantum dot layer specifically includes: forming a first sublayer including the first quantum dots; forming a first type of second sublayer including the second quantum dots on a side of the first sublayer away from the substrate; A third sublayer including the first scattering particles is formed on a side of the second sublayer facing away from the first sublayer.

21. The method according to any one of claims 17 to 20, wherein: The plurality of sub-pixel regions include: a plurality of blue sub-pixel regions; the method further includes: Multiple scattering sub-layers are sequentially formed in the first opening area corresponding to the blue sub-pixel area.

22. A display device, wherein: The invention comprises a display panel according to any one of claims 1 to 16.

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