Display panel and display apparatus

Abstract

Disclosed in the present disclosure are a display panel and a display apparatus, which are used for improving the conversion rate of quantum dots. The display panel provided in the embodiments of the present disclosure comprises a base substrate which comprises a plurality of sub-pixel regions arranged in an array in a first direction and a second direction, the first direction intersecting with the second direction; a plurality of light-emitting devices, which are located on one side of the base substrate and are in one-to-one correspondence with the sub-pixel regions; a first pixel definition layer, which is located on the side of the light-emitting devices facing away from the base substrate and comprises first opening regions in one-to-one correspondence with the sub-pixel regions, the reflectivity of the first pixel definition layer to light in a waveband range of 400 nm-700 nm being greater than 20%. The first pixel definition layer comprises: a first side surface surrounding the first opening regions, the first side surface being a recessed surface which recesses towards the first pixel definition layer; and a plurality of quantum dot patterns, which are located on the side of the light-emitting devices facing away from the base substrate and located in at least part of the first opening regions.

Description

Display panel and display device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on September 22, 2023, with application number 202311238150.1 and invention name "Display Panel and Display Device", the entire content of which is incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0004] The combination of Quantum Dots (QD) and Organic Light Emitting Diode (OLED) technology has the advantages of high color gamut, excellent viewing angle, and high contrast.

[0005] In the current technologically mature QD-OLED devices, the QD layer is located above the OLED device and is used for color conversion. The QD-OLED device also includes a pixel definition layer on the same layer as the QD layer, which is used to define the sub-pixel area. The pixel definition layer needs to have a high absorbance to prevent color crosstalk between adjacent QD layers and ensure the color purity of the QD-OLED device. The pixel definition layer is usually a black pixel definition layer with a black dye added. The black pixel definition layer is difficult to be penetrated by ultraviolet light during ultraviolet curing. Therefore, the thickness of the black pixel definition layer that can be cured by ultraviolet light is limited. The thickness of the QD layer is limited by the thickness of the pixel definition layer. Within a certain thickness range, the conversion rate of the QD layer increases with the increase of its film thickness. Since the thickness of the black pixel definition layer is limited, the conversion rate of the QD layer cannot be increased by increasing the thickness of the QD layer.

[0006] Summary of the Invention

[0007] Embodiments of the present disclosure provide a display panel and a display device for improving the conversion rate of quantum dots.

[0008] An embodiment of the present disclosure provides a display panel, the display panel comprising:

[0009] The substrate includes a plurality of pixel areas arranged in an array along a first direction and a second direction; the pixel area includes a plurality of sub-pixel areas; the first direction intersects the second direction;

[0010] A plurality of light-emitting devices are located on one side of the substrate and correspond one to one with the sub-pixel areas;

[0011] A first pixel definition layer is located on a side of the light-emitting device facing away from the substrate, and includes first opening areas corresponding one-to-one with the sub-pixel areas; the first pixel definition layer has a reflectivity greater than 20% for light in a wavelength range of 400 nanometers to 700 nanometers; the first pixel definition layer includes a first side surface surrounding the first opening area, the first side surface being a concave surface recessed toward the first pixel definition layer;

[0012] A plurality of quantum dot patterns are located on a side of the light emitting device away from the substrate and are located in at least a portion of the first opening area.

[0013] In some embodiments, in a direction perpendicular to the substrate, a cross-sectional area of ​​the first opening region parallel to a plane where the substrate is located gradually increases.

[0014] In some embodiments, the first side is a portion of a spherical surface.

[0015] In some embodiments, the first pixel definition layer includes a first surface facing the substrate and a second surface facing away from the substrate; in the first direction or the second direction, a width d1 of the first opening region on the first surface, a width d2 of the first opening region on the second surface, and a thickness h1 of the first pixel definition layer in a direction perpendicular to the substrate satisfy:

[0016] In some embodiments, in the first direction or the second direction, the width d1 of the first opening area on the first surface, the width d2 of the first opening area on the second surface, and the maximum width L1 of the first pixel definition layer satisfy:

[0017] In some embodiments, the maximum width L1 of the first pixel definition layer in the first direction or the second direction and the thickness h1 of the first pixel definition layer in the direction perpendicular to the substrate satisfy:

[0018] In some embodiments, in the first direction or the second direction, the width d1 of the first opening region on the first surface and the thickness h1 of the first pixel definition layer in the direction perpendicular to the substrate satisfy:

[0019] In some embodiments, a thickness h1 of the first pixel definition layer in a direction perpendicular to the substrate is greater than or equal to 10 micrometers and less than or equal to 20 micrometers.

[0020] In some embodiments, the display panel further comprises:

[0021] The color filter layer is located on the side of the quantum dot pattern away from the base substrate; the thickness of the color filter layer in the direction perpendicular to the base substrate is greater than or equal to 1 micron and less than or equal to 4 microns.

[0022] In some embodiments, the display panel further comprises:

[0023] A multi-layer encapsulation layer is located between the first pixel definition layer and the light-emitting device; at least one of the multi-layer encapsulation layers includes: n low-refractive index encapsulation sublayers and n+1 high-refractive index encapsulation sublayers; wherein n is an integer greater than or equal to 1; and the refractive index of the high-refractive index encapsulation sublayer is greater than the refractive index of the low-refractive index encapsulation sublayer;

[0024] The low-refractive-index encapsulation sublayers and the high-refractive-index encapsulation sublayers are arranged alternately.

[0025] In some embodiments, the high refractive index encapsulation sublayer comprises an inorganic material.

[0026] In some embodiments, the high refractive index encapsulation sublayer includes one or a combination of the following: silicon nitride, silicon oxide, silicon oxynitride.

[0027] In some embodiments, the high refractive index encapsulation sublayer has a refractive index greater than or equal to 1.6 and less than or equal to 1.85.

[0028] In some embodiments, the low refractive index encapsulation sublayer comprises an organic material.

[0029] In some embodiments, the low refractive index encapsulation sublayer includes one or a combination of the following: acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, or benzocyclobutene.

[0030] In some embodiments, the refractive index of the low-refractive-index encapsulation sublayer is greater than or equal to 1.4 and less than or equal to 1.5.

[0031] In some embodiments, the at least one low-refractive-index encapsulation sublayer further includes a plurality of scattering particles.

[0032] In some embodiments, the mass percentage of the scattering particles is greater than or equal to 5% and less than or equal to 10%.

[0033] In some embodiments, the plurality of scattering particles include one or a combination of the following: zinc oxide particles, titanium dioxide particles, hollow silica particles, non-hollow silica particles, nanosilicate particles, and porogen particles.

[0034] In some embodiments, the low-refractive-index encapsulation sublayer has a refractive index greater than or equal to 1.1 and less than or equal to 1.4.

[0035] In some embodiments, the encapsulation layer closest to the quantum dot pattern includes a low refractive index encapsulation sublayer and a high refractive index encapsulation sublayer.

[0036] In some embodiments, n=1, or n=2.

[0037] In some embodiments, the multiple light-emitting devices are blue light-emitting devices; the multiple sub-pixel areas include: multiple red sub-pixel areas, multiple blue sub-pixel areas, and multiple green sub-pixel areas; the quantum dot pattern is only located in the first opening area corresponding to the red sub-pixel area and the green sub-pixel area.

[0038] 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

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] FIG1 is a graph showing the relationship between the conversion rate of a quantum dot pattern and its film thickness according to an embodiment of the present disclosure;

[0041] FIG2 is a schematic structural diagram of a display panel provided by an embodiment of the present disclosure;

[0042] FIG3 is a graph showing an OD value of a first pixel definition layer and an OD value of a black pixel definition layer provided by an embodiment of the present disclosure;

[0043] FIG4 is a reflectivity curve diagram of a black pixel definition layer and a first pixel definition layer provided by an embodiment of the present disclosure;

[0044] FIG5 is a schematic structural diagram of a display panel provided by related art;

[0045] FIG6 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0046] FIG7 is a schematic diagram showing a comparison of a first side surface that is a portion of a spherical surface and a plane, provided by an embodiment of the present disclosure;

[0047] FIG8 is a schematic diagram of a first opening area of ​​a display panel provided by an embodiment of the present disclosure;

[0048] FIG9 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0049] FIG10 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0050] FIG11 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0051] FIG12 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0052] FIG13 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0053] FIG14 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0054] FIG15 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0055] FIG16 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0056] FIG17 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0057] FIG18 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0058] FIG19 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0059] FIG20 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0060] FIG21 is a schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0061] FIG22 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0062] FIG23 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0063] FIG24 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0064] FIG25 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0065] FIG26 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0066] FIG27 is a graph showing the reflectivity of a packaging layer in different wavelength bands provided by an embodiment of the present disclosure;

[0067] FIG28 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0068] FIG29 is a graph showing reflectivity of another packaging layer in different wavelength bands provided by an embodiment of the present disclosure;

[0069] FIG30 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0070] FIG31 is a schematic structural diagram of another display panel provided by an embodiment of the present disclosure;

[0071] FIG32 is a reflectivity curve diagram of another packaging layer for different wavelength bands provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions 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 this field without creative work are within the scope of protection of the present disclosure.

[0073] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0074] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0075] In the related art, the pixel definition layer located in the same layer as the quantum dot pattern is usually a black pixel definition layer with a black dye added, which has a high absorbance and can effectively prevent the color crosstalk of adjacent quantum dot patterns to ensure the color purity of the display product. However, the thickness of the black pixel definition layer that can be UV-cured is about 10 microns (μm) to 11 μm, that is, the thickness of the black pixel definition layer that can be UV-cured is limited. The thickness of the quantum dot pattern is limited by the thickness of the pixel definition layer. The relationship between the conversion rate of the quantum dot pattern and its film thickness is shown in Figure 1. Within a certain thickness range, when the thickness of the quantum dot pattern does not exceed 15 μm, the conversion rate of the quantum dot pattern increases with the increase of its film thickness, and the maximum thickness of the black pixel definition layer is much less than 15 μm. Due to the limited thickness of the black pixel definition layer, it is impossible to increase the thickness of the quantum dot pattern by increasing the thickness of the black pixel definition layer to improve the conversion rate of the quantum dot pattern.

[0076] An embodiment of the present disclosure provides a display panel, as shown in FIG2 , comprising:

[0077] A substrate 1 includes a plurality of pixel regions 1-1 arranged in an array along a first direction X and a second direction Y (not shown), each pixel region 1-1 including a plurality of sub-pixel regions 101; the first direction X intersects the second direction Y; for example, the first direction X is perpendicular to the second direction Y;

[0078] A plurality of light emitting devices 2 are located on one side of the base substrate 1 and correspond one to one with the sub-pixel areas 101;

[0079] A first pixel definition layer 3 is located on a side of the light-emitting device 2 facing away from the substrate 1 and includes first openings 301 corresponding one-to-one with the sub-pixel areas 101. The first pixel definition layer 3 has a reflectivity greater than 20% for light in the wavelength range of 400 nm to 700 nm. The first pixel definition layer 3 includes a first side surface 302 surrounding the first opening 301, the first side surface 302 being a concave surface recessed toward the first pixel definition layer 3.

[0080] The plurality of quantum dot patterns 4 are located on a side of the light emitting device 2 facing away from the substrate 1 and are located in at least a portion of the first opening region 301 .

[0081] In the display panel provided by the embodiment of the present disclosure, the reflectivity of the first pixel definition layer to light in the wavelength range of 400 nanometers to 700 nanometers is greater than 20%, that is, the first pixel definition layer is a pixel definition layer that does not contain black dye, for example, the first pixel definition layer is a gray pixel definition layer. The first pixel definition layer has a first opening area, and the quantum dot pattern is located within at least a portion of the first opening area, that is, the first pixel definition layer and the multiple quantum dot patterns are located on the same layer. Compared to the black pixel definition layer of the related art, since the first pixel definition layer does not contain black dye, the first pixel definition layer is set thicker and can also be penetrated and cured by ultraviolet light. Therefore, compared to the related art, the thickness of the first pixel definition layer can be increased, thereby increasing the thickness of the quantum dot pattern and improving the conversion rate of the quantum dot pattern. In addition, the reflectivity of the first pixel definition layer is greater than that of the black pixel definition layer. The light emitted by the quantum dot pattern will be reflected when it reaches the first pixel definition layer. The first side surface of the first pixel definition layer surrounding the first opening area is a concave surface. The light emitted by the quantum dot pattern will be reflected after reaching the concave surface. The reflected light is emitted toward the front side of the display panel, that is, the light emitting surface, thereby making full use of the light reflected by the first side surface, thereby improving the light utilization rate of the display panel and the front light emitting efficiency.

[0082] In a specific implementation, the first pixel definition layer includes scattering particles to make the film appear gray and obtain a gray pixel definition layer. The scattering particles include titanium oxide (TiO2) particles, for example.

[0083] In some embodiments, as shown in FIG. 2 , the pixel region 1 - 1 includes a red sub-pixel region R, a blue sub-pixel region B, and a green sub-pixel region G.

[0084] It should be noted that the pixel definition layer, located on the same layer as the quantum dot pattern, not only divides sub-pixels but also requires high absorbance to prevent color crosstalk between adjacent quantum dot patterns. Absorbance is typically measured in OD values. OD stands for optical density, representing the light density absorbed by the object being detected. OD = lg(1 / T), where T is transmittance. The OD values ​​of the first pixel definition layer (i.e., the gray pixel definition layer) and the black pixel definition layer are shown in Figure 3. It can be seen that in the blue light band (400 nm to 480 nm), the OD value of the first pixel definition layer is higher than that of the black pixel definition layer, with an OD of ≥1.6, indicating that only 2% of blue light can pass through the first pixel definition layer. In the green light band (520 nm to 570 nm), the OD value of the black pixel definition layer is higher than that of the first pixel definition layer, with an OD value close to 2, indicating that only 1% of green light can pass through the first pixel definition layer. In the red light band (600 nm to 690 nm), the OD values ​​of the black pixel definition layer and the first pixel definition layer are almost identical. According to FIG. 3 and the above discussion, the first pixel definition layer has the same effect as the black pixel definition layer in absorbing light in the 400 nm to 700 nm band. Therefore, the first pixel definition layer used in the embodiment of the present disclosure can also prevent color crosstalk between adjacent quantum dot patterns.

[0085] It should be noted that in the display panel provided by the embodiments of the present disclosure, the quantum dot pattern is used to absorb 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 pattern is the same as the color of the sub-pixel area corresponding to the quantum dot pattern.

[0086] In some embodiments, the light emitting device is a blue light emitting device; as shown in FIG. 2 , the quantum dot pattern 4 is only located in the first opening region 301 corresponding to the red sub-pixel region R and the green sub-pixel region G.

[0087] Specifically, the quantum dot pattern 4 located in the first opening area 301 corresponding to the red sub-pixel area R is a red light quantum dot pattern r that absorbs blue light and radiates red light, and the quantum dot pattern 4 located in the first opening area 301 corresponding to the green sub-pixel area G is a green light quantum dot pattern g that absorbs blue light and radiates green light.

[0088] In a specific implementation, the material of the quantum dot pattern includes a core-shell quantum dot structure; the core material in the core-shell quantum dot structure can be, for example, cadmium selenide (CdSe) or indium phosphide (InP), and the shell material in the core-shell quantum dot structure can be, for example, zinc sulfide (ZnS).

[0089] In some embodiments, since the light-emitting device is a blue light-emitting device, as shown in FIG2 , the blue sub-pixel region B does not need to be provided with a quantum dot pattern so that the display panel can achieve full-color display.

[0090] In some embodiments, as shown in FIG. 2 , the display panel may further include a light-transmitting filling structure 9 for filling the first opening area 301 corresponding to the blue sub-pixel area B.

[0091] During specific implementation, the light-transmitting filling structure includes, for example, a light-transmitting resin material.

[0092] It should be noted that, as shown in FIG2 , when the light 11-3 emitted by the light-emitting device 2 passes through the filling structure 9 and reaches the first side surface 302, it will still be reflected and emitted toward the front of the display panel. That is, although the area corresponding to the blue sub-pixel region B does not include a quantum dot pattern, the side surface of the first opening region 301 corresponding to the blue sub-pixel region B is a portion of a spherical surface, which can still improve the front light extraction efficiency of the blue sub-pixel region. That is, the display panel provided by the embodiment of the present disclosure, in which the first side surface is a portion of a spherical surface, can improve the front light extraction efficiency of each sub-pixel region, thereby improving the front light extraction efficiency of the entire display panel, improving the display effect, and reducing power consumption.

[0093] It should be noted that the reflectivity of the black pixel definition layer and the first pixel definition layer is shown in Figure 4. It can be seen that the reflectivity of the black pixel definition layer in the full band of visible light, i.e., the range of 400nm to 700nm, is ≤5%, while the reflectivity of the first pixel definition layer in the blue light band, i.e., the range of 400nm to 480nm, is about 35%, in the green light band, i.e., the range of 520nm to 570nm, is about 30%, and in the red light band, i.e., the range of 600nm to 690nm, is about 30%. The above data obtained according to Figure 4 show that the red light or green light emitted from the quantum dot pattern and incident on the side of the first pixel definition layer will be reflected. The display panel provided by the embodiment of the present disclosure sets the first side of the first pixel definition layer as a concave surface, so that the reflected light of the concave surface can be fully utilized and guided to the forward light output, which is conducive to improving the light utilization rate and improving the front light output efficiency of the display panel.

[0094] In some embodiments, as shown in FIG2 , the cross-sectional area of ​​the first opening region 301 parallel to the plane of the substrate 1 gradually increases in a direction perpendicular to the substrate 1. That is, the further away from the substrate 1, the larger the cross-sectional area of ​​the first pixel definition layer 3.

[0095] In the related art, as shown in FIG5 , the side surface of the black pixel definition layer 10 surrounding the first opening area 301 is a sloped surface 1001, and this sloped surface 1001 faces the base substrate 1. According to the reflectivity curve of the black pixel definition layer shown in FIG4 , light reaching the surface of sloped surface 1001 is almost completely absorbed, affecting the light utilization efficiency of the display panel. If the black pixel definition layer 10 shown in FIG5 is directly replaced with the first pixel definition layer 3 without changing the side shape, as shown in FIG6 , most of the light 11 reaching the first side surface 302 of the first pixel definition layer 3 is reflected toward the base substrate 1. Most of the reflected light still cannot be utilized to increase the front light extraction efficiency of the display panel.

[0096] The display panel provided by the embodiment of the present disclosure has a first side surface that is concave, and the cross-sectional area of ​​the first opening region parallel to the plane of the base substrate gradually increases, that is, the first side surface faces the front of the display panel, so that the light reaching the concave surface is reflected and emitted more toward the front of the display panel, avoiding the reflected light reaching the concave surface from being reflected to the back of the display panel, which can improve the light utilization rate and the front light output efficiency of the display panel.

[0097] In some embodiments, as shown in FIG. 2 , the first side surface 302 is a portion of a spherical surface.

[0098] It should be noted that, as shown in FIG7 , although the first side surface 302 is an inclined plane 3022 facing the light-emitting side, the reflected light 11-2 of the inclined plane 3022 can also be emitted toward the front of the display panel, but the propagation direction of the light after reaching a portion of the spherical surface is different from the propagation direction of the light reaching the inclined plane. As shown in FIG7 , when the first side surface 302 is a portion of the spherical surface 3021 facing the light-emitting side, the angle between the reflected light 11-1 of a portion of the spherical surface 3021 and the direction perpendicular to the substrate, i.e., the Z direction in the figure, is small and can even be 0, while the angle between the reflected light 11-2 of the inclined plane 3022 and the Z direction is large. That is, in the display panel provided by the embodiment of the present disclosure, when the first side surface 302 is a portion of the spherical surface 3021 facing the light-emitting side, it is more conducive to improving the front viewing angle and the Z-direction viewing angle brightness of the display panel, which is conducive to improving the display effect.

[0099] In a specific implementation, as shown in FIG2 , the first pixel definition layer 3 has a first surface 303 facing the substrate 1 and a second surface 304 facing away from the substrate 1. A first side surface 302 connects the first and second surfaces 303 and 304. The first opening 301 has a width d1 on the first surface 303 and a width d2 on the second surface 304. Half of the width d2 of the first opening 301 on the second surface 304, d2 / 2, is equal to the radius r of the first side surface 302.

[0100] In a specific implementation, when fabricating the first pixel definition layer, a full layer of the first pixel definition layer can be formed first, followed by patterning processes such as exposure and development to form a pattern of multiple first opening regions. For example, multiple exposure processes can be used to form the pattern of multiple first opening regions so that the first side surface is a portion of a spherical surface. The first exposure process can form a rectangular cross-section of the first opening region perpendicular to the substrate. That is, after the single-side exposure process, the side surface of the first pixel definition layer surrounding the first opening region is perpendicular to the substrate. The second exposure process then forms the first side surface of a portion of a spherical surface with a radius of r = d² / 2.

[0101] In some embodiments, as shown in FIG. 2 , in the first direction X or in the second direction Y, the width d1 of the first opening area 301 on the first surface 303 , the width d2 of the first opening area 301 on the second surface 304 , and the thickness h1 of the first pixel definition layer 3 in a direction perpendicular to the substrate 1 satisfy:

[0102] That is, the radius of the sphere

[0103] It should be noted that FIG. 2 only shows d1 and d2 in the first direction X.

[0104] In some embodiments, a thickness h1 of the first pixel definition layer in a direction perpendicular to the base substrate is greater than or equal to 10 μm and less than or equal to 20 μm.

[0105] In a specific implementation, the thickness of the quantum dot pattern in a direction perpendicular to the substrate is equal to the thickness of the first pixel definition layer, that is, the thickness of the quantum dot pattern is also h1. When h1 is greater than or equal to 10 μm and less than or equal to 20 μm, as shown in Figure 1, the quantum dot pattern has a high conversion rate.

[0106] Furthermore, a thickness h1 of the first pixel definition layer in a direction perpendicular to the base substrate is greater than or equal to 10 μm and less than or equal to 15 μm.

[0107] It should be noted that, as shown in Figure 1, when the film thickness and the thickness of the quantum dot pattern in the direction perpendicular to the substrate are less than or equal to 15μm, the conversion rate of the quantum dot pattern increases with increasing film thickness. When the thickness of the quantum dot pattern is greater than 15μm, the conversion rate of the quantum dot pattern decreases with increasing film thickness. In other words, when the thickness of the quantum dot pattern is greater than 15μm, increasing the thickness of the first pixel definition layer and the thickness of the quantum dot pattern will not increase the conversion rate of the quantum dot pattern. When h1 is greater than or equal to 10μm and less than or equal to 15μm, it can avoid excessively increasing the thickness of the first pixel definition layer and the quantum dot pattern while ensuring a high conversion rate of the quantum dot pattern, thereby avoiding excessively increasing the total thickness of the display panel.

[0108] In a specific implementation, in the first direction X or in the second direction Y, d1 is, for example, greater than or equal to 4 μm and less than or equal to 120 μm.

[0109] In some embodiments, the shape of the orthographic projection of the first opening region 301 on the substrate is shown in FIG. 8 to FIG. 21 .

[0110] For example, as shown in Figures 8 to 11, the multiple first opening areas 301 include a first sub-pixel opening area 3011, a second sub-pixel opening area 3012 and a third sub-pixel opening area 3013; the first sub-pixel opening area 3011, the second sub-pixel opening area 3012 and the third sub-pixel opening area 3013 correspond to different sub-pixel areas respectively. As shown in FIG8 , the second sub-pixel opening area 3012 is staggered with the first sub-pixel opening area 3011, and the second sub-pixel opening area 3012 is staggered with the third sub-pixel opening area 3013; as shown in FIG9 , in the first sub-pixel opening area 3011, the second sub-pixel opening area 3012 and the third sub-pixel opening area 3013 corresponding to a pixel 1-1, in the first direction X, the first sub-pixel opening area 3011 is adjacent to the second sub-pixel opening area 3012 and the third sub-pixel opening area 3013, and the outline of the arrangement of the first sub-pixel opening area 3011, the second sub-pixel opening area 3012 and the third sub-pixel opening area 3013 corresponding to the pixel 1-1 is a rectangle; as shown in FIG10 , in the first direction X , the projection of the first sub-pixel opening area 3011 and the projection of the second sub-pixel opening area 3012 both overlap with the projection of the third sub-pixel opening area 3013, the projection of the first sub-pixel opening area 3011 and the projection of the third sub-pixel opening area 3013 have a non-overlapping area, and in the second direction Y, the projection of the first sub-pixel opening area 3011 and the projection of the second sub-pixel opening area 3012 have an overlapping area; as shown in FIG11 , the first sub-pixel opening area 3011, the second sub-pixel opening area 3012 and the third sub-pixel opening area 3013 corresponding to a pixel 1-1 are arranged in two rows, and the center line of the first sub-pixel opening area 3011, the second sub-pixel opening area 3012 and the third sub-pixel opening area 3013 is a triangle.

[0111] In a specific implementation, as shown in Figures 8, 9, and 10, the areas of the first sub-pixel opening area 3011, the second sub-pixel opening area 3012, and the third sub-pixel opening area 3013 are not exactly the same, or, as shown in Figure 11, the areas of the first sub-pixel opening area 3011, the second sub-pixel opening area 3012, and the third sub-pixel opening area 3013 are exactly the same.

[0112] Alternatively, in a specific implementation, as shown in Figures 12 to 16, at least part of the first opening area may also be other shapes. As shown in Figure 12, the shapes of the first sub-pixel opening area 3011 and the third sub-pixel opening area 3013 are rectangular, and the shape of the second sub-pixel opening area 3012 is L-shaped; as shown in Figure 11, the shapes of the first sub-pixel opening area 3011 and the second sub-pixel opening area 3012 are L-shaped, and the shape of the third sub-pixel opening area 3013 is rectangular; as shown in Figures 14 and 15, the shapes of the first sub-pixel opening area 3011 and the second sub-pixel opening area 3012 are pentagons, and the shape of the third sub-pixel opening area 3013 is a rectangle; as shown in Figure 16, the shapes of the first sub-pixel opening area 3011, the second sub-pixel opening area 3012 and the third sub-pixel opening area 3013 are all irregular polygons.

[0113] Alternatively, in a specific implementation, as shown in Figures 17 to 21 , the first sub-pixel opening area 3011, the second sub-pixel opening area 3012, and the third sub-pixel opening area 3013 are all non-rectangular. As shown in Figures 17 and 18 , the first sub-pixel opening area 3011, the second sub-pixel opening area 3012, and the third sub-pixel opening area 3013 are all octagons, and the first sub-pixel opening area 3011, the second sub-pixel opening area 3012, and the third sub-pixel opening area 3013 corresponding to a pixel 1-1 are arranged in two rows, with the center line of the first sub-pixel opening area 3011, the second sub-pixel opening area 3012, and the third sub-pixel opening area 3013 forming a triangle. The first opening area 301 shown in Figure 19 is an asymmetric octagon, the first opening area 301 shown in Figure 20 is a hexagon, and the first opening area 301 shown in Figure 21 is a heptagon.

[0114] In some embodiments, as shown in FIG. 2 , in the first direction X or in the second direction Y, the width d1 of the first opening area 301 on the first surface 303 and the width d2 of the first opening area 301 on the second surface 304 , and the width L1 of the first pixel definition layer 3 on the first surface 303 satisfy:

[0115] It should be noted that, as shown in Figure 2, since the cross-sectional area of ​​the first opening region 301 parallel to the plane direction of the substrate 1 gradually increases in the direction of the substrate 1 pointing to the first pixel definition layer 3, correspondingly, the width of the first pixel definition layer 3 in the first direction X or in the second direction Y gradually decreases, and the width of the first pixel definition layer 3 on the first surface 303 is L1.

[0116] In a specific implementation, in order to ensure that the sub-pixel has a larger aperture ratio, L1 is greater than or equal to 20 μm and less than or equal to 40 μm.

[0117] In some embodiments, the maximum width L1 of the first pixel definition layer 3 in the first direction X or in the second direction Y and the thickness h1 of the first pixel definition layer 3 in the direction perpendicular to the substrate 1 satisfy:

[0118] In some embodiments, in the first direction X or in the second direction Y, the width d1 of the first opening area 301 on the first surface 303 and the thickness h1 of the first pixel definition layer 3 in a direction perpendicular to the substrate 1 satisfy:

[0119] It should be noted that, as shown in FIG. 2 , the larger the angle a1 is, the greater the curvature of the first side surface 302 is, so that more light 11 incident on the first side surface 302 can be emitted toward the front surface of the display panel.

[0120] The display panel provided by the embodiment of the present disclosure, Right now 9.5°≤a1≤26.6°. While ensuring a large aperture ratio for the sub-pixel, the angle a1 can be made as large as possible, thereby increasing the curvature of the first side surface so that more light incident on the first side surface is emitted toward the front of the display panel, thereby improving the front light emission efficiency of the display panel.

[0121] In a specific implementation, when the light-emitting device is a blue light-emitting device and the first side surface of the first pixel definition layer is a portion of a spherical surface, the light reaching the first side surface is reflected, and its optical path is changed, so that it is emitted in a direction perpendicular to or nearly perpendicular to the substrate, thereby improving the forward light extraction efficiency of the display panel. Compared to the display panel provided by the prior art as shown in Figure 5, the display panel provided by the embodiment of the present disclosure can improve the forward light extraction efficiency corresponding to the red sub-pixel area and the green sub-pixel area by approximately 10%, and the forward light extraction efficiency corresponding to the blue sub-pixel area by approximately 5%.

[0122] In some embodiments, as shown in FIG22 , the display panel further includes:

[0123] The color filter layer 5 is located on the side of the quantum dot pattern 4 facing away from the base substrate 1 .

[0124] In some embodiments, as shown in FIG22 , the color filter layer 5 includes: a light shielding layer 501 and a plurality of color resists 502 ;

[0125] The light shielding layer 501 has a plurality of second opening areas 5011 , and the color resist 502 is located in the second opening areas 5011 ; the second opening areas 5011 correspond one-to-one to the sub-pixel areas 101 ;

[0126] The orthographic projection of the second opening area 5011 on the base substrate 1 overlaps with the orthographic projection of the first opening area 301 on the base substrate 1 .

[0127] In some embodiments, as shown in FIG. 22 , the plurality of color resists 33 include: red color resists R′ corresponding one-to-one to the red sub-pixel regions R, a plurality of green color resists G′ corresponding one-to-one to the green sub-pixel regions G, and a plurality of blue color resists B′ corresponding one-to-one to the blue sub-pixel regions B.

[0128] In a specific implementation, the color resist includes a filter material, for example, a dye corresponding to the color of the sub-pixel.

[0129] It should be noted that after the blue light emitted by the light-emitting device reaches the red light quantum dot pattern or the green light quantum dot pattern, it may not be completely absorbed and may be emitted from the quantum dot pattern. That is, the light emitted by the red light quantum dot pattern or the green light quantum dot pattern may contain blue light, which will cause the color purity of the red sub-pixel area and the green sub-pixel area to decrease.

[0130] The display panel provided by the embodiment of the present disclosure has a color filter layer including color resist disposed on the side of the quantum dot pattern facing away from the base substrate. The color resist can filter the blue light emitted by the quantum dot pattern to improve the color purity.

[0131] It should be noted that in the related art, since the light conversion efficiency of the quantum dot pattern is not high, a thicker color group layer, namely a color filter layer, needs to be set to ensure the filtering effect of the red color block and the green color block on the blue light. In the related art, the thickness of the color filter layer is greater than or equal to 2μm and less than or equal to 6μm. However, the display panel provided by the embodiment of the present disclosure has a first pixel definition layer, and the light reaching the first side of the first pixel definition layer will be reflected. Therefore, the blue light that is not absorbed by the quantum dot pattern will be reflected after reaching the first side, thereby changing the light path. In this way, part of the reflected blue light returns to the quantum dot pattern to excite the quantum dot particles of the quantum dot pattern to emit green light or red light. That is, compared with the prior art, the display panel provided by the embodiment of the present disclosure can reduce the blue light emitted from the quantum dot pattern, and therefore, the thickness of the color filter layer can be thinned, thereby reducing costs.

[0132] In some embodiments, as shown in FIG. 22 , a thickness h2 of the color filter layer 5 in a direction perpendicular to the base substrate 1 is greater than or equal to 1 μm and less than or equal to 4 μm.

[0133] That is, compared with the prior art, the thickness of the color filter layer of the display panel provided by the embodiment of the present disclosure can be reduced by 1 / 3 to half.

[0134] In some embodiments, as shown in FIG. 22 , the display panel further includes: a quantum dot encapsulation layer 12 located between the quantum dot pattern 4 and the color filter layer 5 .

[0135] 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 be other light-emitting devices such as Micro LEDs and Mini LEDs.

[0136] Next, an OLED light-emitting device is used as an example for explanation.

[0137] In some embodiments, as shown in FIG2 and FIG22 , the display panel further includes:

[0138] The encapsulation layer 6 is located between the first pixel definition layer 3 and the light emitting device 2;

[0139] The driving circuit layer 7 is located between the base substrate 1 and the light emitting device 2;

[0140] The second pixel definition layer 8 is located between the driving circuit layer 7 and the first pixel definition layer 3 ; the second pixel definition layer 8 includes third opening areas 801 corresponding to the sub-pixel areas 101 on a one-to-one basis.

[0141] In some embodiments, as shown in Figures 2 and 22, the light-emitting device 2 includes an anode 201, a light-emitting functional layer 202, and a cathode 203 stacked in sequence in the third opening area 801, wherein the anode 201 is located between the second pixel definition layer 8 and the driving circuit layer 7, the second pixel definition layer 8 covers the edge of the anode 201, and the cathodes 203 corresponding to the multiple sub-pixel areas 101 are connected as one.

[0142] In some embodiments, the display panel may further include a light extraction layer between the cathode and the encapsulation layer.

[0143] In a specific implementation, the driver circuit layer includes a plurality of pixel driver circuits arranged in an array; the pixel driver circuit is used to drive the light-emitting device to emit light; as shown in FIG23 , the pixel driver circuit includes a thin-film transistor (TFT) and a storage capacitor (not shown); FIG23 shows only one thin-film transistor (TFT) connected to the light-emitting device 2; of course, the pixel driver circuit may include more thin-film transistors; the thin-film transistor (TFT) includes an active layer 701, a gate G, a source S, and a drain D; as shown in FIG23 , the display substrate also includes a buffer layer 13 located between the base substrate 1 and the active layer 701; the driver circuit layer 7 also includes a first gate insulating layer 702 located between the active layer 701 and the gate G, an interlayer insulating layer 703 located between the first gate insulating layer 702 and the source S and drain D, and a first planarization layer 704 located between the light-emitting device 2 and the source S and drain D. The anode 203 is connected to the drain D via a via extending through the first planarization layer 704. FIG23 illustrates a top-gate thin-film transistor (TFT) as an example; of course, the thin-film transistor (TFT) may also have a bottom-gate or other structure. When the thin film transistor has a bottom gate structure, the active layer is located on the side of the gate away from the substrate, and the driving circuit layer also includes: a first gate insulating layer located between the active layer and the gate, and a first planarization layer located between the light emitting device and the source and drain electrodes.

[0144] In a specific implementation, the light-emitting functional layer includes an organic light-emitting layer, and may further include an electron injection layer, an electron transport layer, a hole transport layer, a hole injection layer, and the like.

[0145] 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.

[0146] In some embodiments, as shown in FIG2 and FIG22 , the display panel includes a multi-layer encapsulation layer 6 ;

[0147] The multi-layer encapsulation layer 6 includes: a first encapsulation layer 6 - 1 , a second encapsulation layer 6 - 2 , and a third encapsulation layer 6 - 3 , which are sequentially stacked on the side of the light emitting device 2 facing away from the substrate 1 .

[0148] In a specific implementation, the first encapsulation layer 6 - 1 , the second encapsulation layer 6 - 2 , and the third encapsulation layer 6 - 3 in FIG. 2 and FIG. 22 are all single-layer films.

[0149] In a specific implementation, the first encapsulation layer 6 - 1 and the third encapsulation layer 6 - 3 in FIG. 2 and FIG. 22 are, for example, inorganic encapsulation layers, and the second encapsulation layer 6 - 2 is, for example, an organic encapsulation layer.

[0150] Alternatively, in some embodiments, as shown in FIG. 24 to FIG. 26 , at least one encapsulation layer 6 is a composite structure including multiple film layers.

[0151] In some embodiments, as shown in FIG. 24 to FIG. 26 , the display panel includes a multi-layer encapsulation layer 6 ;

[0152] At least one of the multi-layer encapsulation layers 6 includes: n low-refractive-index encapsulation sublayers 601 and n+1 high-refractive-index encapsulation sublayers 602; wherein n is an integer greater than or equal to 1; and the refractive index of the high-refractive-index encapsulation sublayer 602 is greater than the refractive index of the low-refractive-index encapsulation sublayer 601.

[0153] The low-refractive-index encapsulation sublayers 601 and the high-refractive-index encapsulation sublayers 602 are arranged alternately.

[0154] In a specific implementation, the encapsulation layer includes: n low-refractive-index encapsulation sublayers and n+1 high-refractive-index encapsulation sublayers, that is, the encapsulation layer includes at least one low-refractive-index encapsulation sublayer and two high-refractive-index encapsulation sublayers.

[0155] In a specific implementation, as shown in Figures 24 to 26, the encapsulation layer 6 includes: n layers of low-refractive-index encapsulation sublayers 601 and n+1 layers of high-refractive-index encapsulation sublayers 602, and the encapsulation sublayer on the side closest to the base substrate 1 and the encapsulation sublayer on the side farthest from the base substrate 1 in the encapsulation layer 6 are both high-refractive-index encapsulation sublayers 602.

[0156] In the display panel provided by the embodiment of the present disclosure, a portion of the light emitted by the quantum dot pattern will be emitted toward the side of the encapsulation layer. When the light propagates to the encapsulation layer, since at least one of the multi-layer encapsulation layers includes alternating low-refractive index encapsulation sublayers and high-refractive index encapsulation sublayers, and the refractive index of the low-refractive index encapsulation sublayer is smaller than the refractive index of the high-refractive index encapsulation sublayer, the interference between the reflected light at the interface between the low-refractive index encapsulation sublayer and the high-refractive index encapsulation sublayer increases the light reflectivity within a specific wavelength range. Therefore, at the interface between the low-refractive index encapsulation sublayer and the high-refractive index encapsulation sublayer, the light emitted by the quantum dot pattern and propagating toward the side of the substrate can be reflected back to the front and then emitted, which can improve the light utilization efficiency and thereby improve the brightness conversion rate of the quantum dot pattern.

[0157] In some embodiments, the high refractive index encapsulation sublayer comprises an inorganic material.

[0158] In some embodiments, the high refractive index encapsulation sublayer includes one or a combination of the following: silicon nitride, silicon oxide, silicon oxynitride.

[0159] In some embodiments, the low refractive index encapsulation sublayer comprises an organic material.

[0160] In some embodiments, the low refractive index encapsulation sublayer includes one or a combination of the following: acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, or benzocyclobutene.

[0161] In practice, the thickness and refractive index of the low-refractive-index encapsulation sublayer and the high-refractive-index encapsulation sublayer can be adjusted to increase the reflectivity or transmittance of light within a specific wavelength range. For example, the encapsulation layer comprising the low-refractive-index encapsulation sublayer and the high-refractive-index encapsulation sublayer can be configured to have a higher reflectivity for red and green light. This allows the red or green light emitted by the quantum dot pattern and propagating toward one side of the substrate to be reflected back to the front side and emitted, thereby improving light utilization and, in turn, the brightness conversion rate of the quantum dot pattern.

[0162] In some embodiments, the high refractive index encapsulation sublayer has a refractive index greater than or equal to 1.6 and less than or equal to 1.85.

[0163] In some embodiments, the thickness of the high refractive index encapsulation sublayer is greater than or equal to 0.2 μm and less than or equal to 1.0 μm.

[0164] In some embodiments, the refractive index of the low-refractive-index encapsulation sublayer is greater than or equal to 1.4 and less than or equal to 1.5.

[0165] In some embodiments, the thickness of the low refractive index encapsulation sublayer is greater than or equal to 0.4 μm and less than or equal to 1.0 μm.

[0166] In a specific implementation, for an encapsulation layer including a low-refractive-index encapsulation sublayer and a high-refractive-index encapsulation sublayer, the materials of the high-refractive-index encapsulation sublayers in different layers may be the same or different, the refractive indices of the high-refractive-index encapsulation sublayers in different layers may be the same or different, and the thicknesses of the high-refractive-index encapsulation sublayers in different layers may be the same or different. If the encapsulation layer includes multiple layers of low-refractive-index encapsulation sublayers, the materials of the low-refractive-index encapsulation sublayers in different layers may be the same or different, the refractive indices of the low-refractive-index encapsulation sublayers in different layers may be the same or different, and the thicknesses of the low-refractive-index encapsulation sublayers in different layers may be the same or different.

[0167] In a specific implementation, as shown in FIG24 to FIG26 , the multi-layer encapsulation layer 6 includes: a first encapsulation layer 6-1, a second encapsulation layer 6-2, and a third encapsulation layer 6-3 stacked in sequence on the side of the light-emitting device 2 away from the base substrate 1.

[0168] In a specific implementation, as shown in Figures 24 to 26, the first encapsulation layer 6-1 and / or the third encapsulation layer 6-3 includes a low-refractive-index encapsulation sublayer 601 and a high-refractive-index encapsulation sublayer 602. That is, as shown in Figure 24, only the first encapsulation layer 6-1 includes a low-refractive-index encapsulation sublayer 601 and a high-refractive-index encapsulation sublayer 602. Alternatively, as shown in Figure 25, both the first encapsulation layer 6-1 and the third encapsulation layer 6-3 include a low-refractive-index encapsulation sublayer 601 and a high-refractive-index encapsulation sublayer 602. Alternatively, as shown in Figure 26, only the third encapsulation layer 6-3 includes a low-refractive-index encapsulation sublayer 601 and a high-refractive-index encapsulation sublayer 602.

[0169] In a specific implementation, the second encapsulation layer is, for example, an organic encapsulation layer. As shown in FIG24 , when only the first encapsulation layer 6-1 includes a low-refractive-index encapsulation sublayer 601 and a high-refractive-index encapsulation sublayer 602, the third encapsulation layer 6-3 is an inorganic encapsulation layer. As shown in FIG26 , when only the third encapsulation layer 6-3 includes a low-refractive-index encapsulation sublayer 601 and a high-refractive-index encapsulation sublayer 602, the first encapsulation layer 6-1 is an inorganic encapsulation layer.

[0170] It should be noted that the second encapsulation layer, i.e., the organic encapsulation layer, is used for planarization, so its thickness is relatively thick, typically greater than or equal to 8 microns and less than or equal to 12 microns. When the encapsulation layer closest to the substrate in the multi-layer encapsulation layer, i.e., the first encapsulation layer, includes a low-refractive index encapsulation sublayer and a high-refractive index encapsulation sublayer, light reflected at the interface between the low-refractive index encapsulation sublayer and the high-refractive index encapsulation sublayer must pass through the second encapsulation layer before being emitted, resulting in a loss of transmittance. In some embodiments, as shown in Figures 25 and 26, the encapsulation layer 6 closest to the quantum dot pattern 4 includes a low-refractive index encapsulation sublayer 601 and a high-refractive index encapsulation sublayer 602, i.e., the third encapsulation layer 6-3 includes a low-refractive index encapsulation sublayer 601 and a high-refractive index encapsulation sublayer 602. As a result, light reflected at the interface between the low-refractive index encapsulation sublayer and the high-refractive index encapsulation sublayer does not need to pass through the second encapsulation layer, avoiding a loss of transmittance, which is more conducive to improving light utilization and improving the brightness conversion rate of the quantum dot pattern.

[0171] In some embodiments, as shown in Figures 24 to 26, n=1, that is, the encapsulation layer includes one low-refractive index encapsulation sublayer 601 and two high-refractive index encapsulation sublayers 602, and the one low-refractive index encapsulation sublayer 601 is located between the two high-refractive index encapsulation sublayers 602, and the encapsulation layer 6 is a composite structure of three encapsulation sublayers.

[0172] Next, we present the reflectivity simulation results of the third encapsulation layer, taking the example of a single low-refractive-index encapsulation sublayer and two high-refractive-index encapsulation sublayers. Figure 27 shows the reflectivity curves for different wavelengths. The reflectivity of the encapsulation layer for the green band (520nm-570nm) and the red band (600nm-690nm) is close to 20%. This means that approximately 20% of the green and red light from the quantum dot pattern incident on the interface of the third encapsulation layer is reflected, changing the optical path and emitting from the front, thereby increasing the overall forward light efficiency of the display panel. In Figure 27, the reflectivity of the third encapsulation layer for the blue band (400nm-480nm) is ≤2%, which is negligible and does not affect the blue light emitted by the light-emitting device passing through the encapsulation layer. This demonstrates that a composite structure of low-refractive-index and high-refractive-index encapsulation layers effectively improves the reflectivity of red and green light, thereby increasing light utilization and enhancing the brightness conversion rate of the quantum dot pattern. When the third encapsulation layer comprises one low-refractive-index and two high-refractive-index encapsulation layers, the front-side light extraction efficiency of the display panel's red and green sub-pixel areas is expected to increase by 12% and 15%, respectively.

[0173] It should be noted that when the encapsulation layer includes alternating low-refractive-index encapsulation sublayers and high-refractive-index encapsulation sublayers, the greater the difference in refractive index between the low-refractive-index encapsulation sublayer and the high-refractive-index encapsulation sublayer, the stronger the total reflection effect at the interface between the two, which is more conducive to improving the reflectivity.

[0174] In some embodiments, as shown in FIG. 28 , the at least one low-refractive-index encapsulation sublayer 601 further includes a plurality of scattering particles 6011 .

[0175] That is, as shown in FIG. 28 , the low-refractive-index encapsulation sublayer 601 includes a substrate 6012 and a plurality of scattering particles 6011 .

[0176] In the display panel provided by the embodiment of the present disclosure, the low-refractive-index encapsulation sublayer also includes a plurality of scattering particles, thereby reducing the refractive index of the overall film layer, making it easier to achieve a refractive index of the low-refractive-index encapsulation sublayer that is lower than that of the high-refractive-index encapsulation sublayer, and further increasing the refractive index difference between the low-refractive-index encapsulation sublayer and the high-refractive-index encapsulation sublayer, which is more conducive to improving the total reflection effect of the interface between the two and more conducive to improving the reflectivity.

[0177] In a specific implementation, the substrate is an organic material, which includes one of the following or a combination thereof: acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, and benzocyclobutene.

[0178] In some embodiments, the plurality of scattering particles include one or a combination of the following: zinc oxide particles, titanium dioxide particles, hollow silica particles, non-hollow silica particles, nanosilicate particles, and porogen particles.

[0179] In some embodiments, the low-refractive-index encapsulation sublayer has a refractive index greater than or equal to 1.1 and less than or equal to 1.4.

[0180] In some embodiments, the thickness of the low refractive index encapsulation sublayer is greater than or equal to 0.2 μm and less than or equal to 0.4 μm.

[0181] In some embodiments, the mass percentage of the scattering particles is greater than or equal to 5% and less than or equal to 10%.

[0182] Next, we present the reflectivity simulation results of the third encapsulation layer, taking as an example a case where only the third encapsulation layer comprises one low-refractive-index encapsulation sublayer and two high-refractive-index encapsulation sublayers, with the low-refractive-index encapsulation sublayer including scattering particles. Figure 29 shows the reflectivity curves for the encapsulation layer for different wavelengths. The encapsulation layer's reflectivity for the green band (wavelength range of 520nm-570nm) and the red band (wavelength range of 600nm-690nm) is close to 25%. This means that approximately 25% of the green and red light from the quantum dot pattern incident on the interface of the third encapsulation layer is reflected, changing its optical path and emitting from the front, thereby increasing the overall forward light extraction efficiency of the display panel. In Figure 28, the reflectivity of the third encapsulation layer for the blue band (wavelength range of 400nm-480nm) is ≤2%, which is negligible and does not affect the blue light emitted by the light-emitting device passing through the encapsulation layer. This demonstrates that adding scattering particles to the low-refractive-index encapsulation sublayer effectively increases the reflectivity of red and green light, thereby improving light utilization and enhancing the brightness conversion rate of the quantum dot pattern. When the third encapsulation layer comprises one low-refractive-index encapsulation sublayer and two high-refractive-index encapsulation sublayers, and the low-refractive-index encapsulation sublayer includes scattering particles, the front-side light extraction efficiency of the red and green subpixel areas of the display panel is expected to increase by 13% and 16%, respectively.

[0183] It should be noted that Figures 24 to 26 and Figure 28 are used as examples to illustrate that the encapsulation layer includes one low-refractive index encapsulation sublayer and two high-refractive index encapsulation sublayers. Of course, in a specific implementation, the encapsulation layer can also include more low-refractive index encapsulation sublayers and more high-refractive index encapsulation sublayers.

[0184] In some embodiments, as shown in FIG30 and FIG31 , n=2. That is, the encapsulation layer 6 includes two low-refractive-index encapsulation sublayers and three high-refractive-index encapsulation sublayers, and the encapsulation layer 6 is a composite structure of five encapsulation sublayers.

[0185] It should be noted that in Figures 30 and 31 , only the third encapsulation sublayer 6-3 includes two low-refractive-index encapsulation sublayers 601 and three high-refractive-index encapsulation sublayers 602. In Figure 30 , the low-refractive-index encapsulation sublayer 601 does not include scattering particles. In a specific implementation, when the encapsulation layer includes multiple low-refractive-index encapsulation sublayers, multiple scattering particles may be added to at least one of the low-refractive-index encapsulation sublayers. For example, as shown in Figure 31 , both low-refractive-index encapsulation sublayers 601 include scattering particles.

[0186] Next, we present the reflectivity simulation results of the third encapsulation layer, taking as an example a case where only the third encapsulation layer comprises two low-refractive-index encapsulation sublayers and three high-refractive-index encapsulation sublayers, with the low-refractive-index encapsulation sublayers including scattering particles. Figure 32 shows the reflectivity curves for the encapsulation layer for different wavelengths. The encapsulation layer's reflectivity for the green band (wavelength range of 520nm-570nm) and the red band (wavelength range of 600nm-690nm) is close to 32%. This means that approximately 32% of the green and red light from the quantum dot pattern incident on the interface of the third encapsulation layer is reflected, changing its optical path and emitting from the front, thereby increasing the overall forward light extraction efficiency of the display panel. In Figure 32, the reflectivity of the third encapsulation layer for the blue band (wavelength range of 400nm-480nm) is ≤2%, which is negligible and does not affect the blue light emitted by the light-emitting device passing through the encapsulation layer. This shows that increasing the number of encapsulation sublayers to five further improves the reflectivity of red and green light, thereby increasing light utilization and enhancing the brightness conversion rate of the quantum dot pattern. When the third encapsulation layer includes two low-refractive index encapsulation sublayers and three high-refractive index encapsulation sublayers, and the low-refractive index encapsulation sublayers include scattering particles, the front light extraction efficiency of the red and green subpixel areas of the display panel is expected to increase by 15% and 18%, respectively.

[0187] It should be noted that further increasing the number of low-refractive-index and high-refractive-index encapsulation sublayers in the encapsulation layer may result in optical waveguides between the low-refractive-index and high-refractive-index encapsulation sublayers in the encapsulation layer. Furthermore, the thickness of the encapsulation layer may be excessive, affecting transmittance and, consequently, the overall gain of the display panel. In specific implementations, the number of low-refractive-index and high-refractive-index encapsulation sublayers in the encapsulation layer may be selected by comprehensively considering factors such as the reflectivity and transmittance of the encapsulation layer.

[0188] A display device provided by an embodiment of the present disclosure includes the display panel provided by an embodiment of the present disclosure.

[0189] The display device provided in the embodiments of the present disclosure is any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system. Other essential components of the display device are well understood by those skilled in the art and are not described here in detail, nor should they be construed as limitations of the present disclosure. The implementation of the display device can be referenced to the above-described display panel embodiments, and any repetitive details will not be repeated.

[0190] In summary, the display panel and display device provided by the embodiments of the present disclosure have a first pixel definition layer having a first opening region, and the quantum dot pattern is located within at least a portion of the first opening region, i.e., the first pixel definition layer and the plurality of quantum dot patterns are located on the same layer. Compared to the black pixel definition layer of the related art, since the first pixel definition layer does not contain a black dye, the first pixel definition layer can be thicker and can also be penetrated and cured by ultraviolet light. Thus, compared to the related art, the thickness of the first pixel definition layer can be increased, thereby increasing the thickness of the quantum dot pattern and improving the conversion rate of the quantum dot pattern. Furthermore, the reflectivity of the first pixel definition layer is greater than that of the black pixel definition layer, and light emitted by the quantum dot pattern is reflected when it reaches the first pixel definition layer. The first side surface of the first pixel definition layer surrounding the first opening region is concave, and light emitted by the quantum dot pattern is reflected upon reaching the concave surface. The propagation direction of the reflected light has a smaller angle with the direction perpendicular to the substrate, which is more conducive to the light reaching the first side surface being emitted along the vertical viewing angle of the display panel, fully utilizing the light reflected from the first side surface, and improving the front light extraction efficiency of the display panel.

[0191] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional 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.

[0192] Obviously, those skilled in the art may 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 intended to include these modifications and variations.

Claims

1. A display panel, wherein: The display panel comprises: A substrate, comprising a plurality of pixel regions arranged in an array along a first direction and a second direction; each of the pixel regions comprises a plurality of sub-pixel regions; the first direction intersects the second direction; A plurality of light emitting devices are located on one side of the base substrate and correspond one to one with the sub-pixel areas; A first pixel definition layer is located on a side of the light emitting device away from the substrate, and includes a first opening area corresponding to the sub-pixel area one by one; the reflectivity of the first pixel definition layer to light in a wavelength range of 400 nanometers to 700 nanometers is greater than 20%; the first pixel definition layer includes: a first side surface surrounding the first opening area, the first side surface being a concave surface recessed toward the first pixel definition layer; A plurality of quantum dot patterns are located on a side of the light emitting device away from the substrate and are located in at least a portion of the first opening area.

2. The display panel according to claim 1, wherein: In a direction perpendicular to the base substrate, a cross-sectional area of ​​the first opening region parallel to a plane where the base substrate is located gradually increases.

3. The display panel according to claim 2, wherein: The first side surface is a part of a spherical surface.

4. The display panel according to claim 3, wherein: The first pixel definition layer includes a first surface facing the substrate and a second surface facing away from the substrate; in the first direction or in the second direction, a width d1 of the first opening area on the first surface, a width d2 of the first opening area on the second surface, and a thickness h1 of the first pixel definition layer in a direction perpendicular to the substrate satisfy:

5. The display panel according to claim 4, wherein: In the first direction or in the second direction, the width d1 of the first opening area on the first surface and the width d2 of the first opening area on the second surface, and the maximum width L1 of the first pixel definition layer satisfy:

6. The display panel according to claim 5, wherein: The maximum width L1 of the first pixel definition layer in the first direction or in the second direction and the thickness h1 of the first pixel definition layer in the direction perpendicular to the substrate satisfy:

7. The display panel according to any one of claims 4 to 6, wherein: In the first direction or in the second direction, the width d1 of the first opening area on the first surface and the thickness h1 of the first pixel definition layer in a direction perpendicular to the substrate satisfy:

8. The display panel according to any one of claims 1 to 6, wherein: In a direction perpendicular to the substrate, a thickness h1 of the first pixel definition layer is greater than or equal to 10 micrometers and less than or equal to 20 micrometers.

9. The display panel according to any one of claims 1 to 6, wherein: The display panel further includes: The color filter layer is located on the side of the quantum dot pattern away from the base substrate; the thickness of the color filter layer in the direction perpendicular to the base substrate is greater than or equal to 1 micron and less than or equal to 4 microns.

10. The display panel according to any one of claims 1 to 6, wherein: The display panel further includes: A multi-layer encapsulation layer, located between the first pixel definition layer and the light-emitting device; at least one of the multi-layer encapsulation layers comprises: n low-refractive index encapsulation sublayers and n+1 high-refractive index encapsulation sublayers; wherein n is an integer greater than or equal to 1; and the refractive index of the high-refractive index encapsulation sublayer is greater than the refractive index of the low-refractive index encapsulation sublayer; The low refractive index encapsulation sublayers and the high refractive index encapsulation sublayers are arranged alternately.

11. The display panel according to claim 10, wherein: The high refractive index encapsulation sublayer includes an inorganic material.

12. The display panel according to claim 11, wherein: The high refractive index encapsulation sublayer includes one of the following or a combination thereof: silicon nitride, silicon oxide, and silicon oxynitride.

13. The display panel according to claim 11 or 12, wherein: The refractive index of the high refractive index encapsulation sublayer is greater than or equal to 1.6 and less than or equal to 1.

85.

14. The display panel according to claim 10, wherein: The low refractive index encapsulation sublayer includes an organic material.

15. The display panel according to claim 14, wherein: The low refractive index encapsulation sublayer includes one of the following or a combination thereof: acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, and benzocyclobutene.

16. The display panel according to claim 14 or 15, wherein: The refractive index of the low-refractive-index encapsulation sublayer is greater than or equal to 1.4 and less than or equal to 1.

5.

17. The display panel according to claim 14 or 15, wherein: At least one of the low refractive index encapsulation sublayers further comprises a plurality of scattering particles.

18. The display panel according to claim 17, wherein: The mass percentage of the scattering particles is greater than or equal to 5% and less than or equal to 10%.

19. The display panel according to claim 17, wherein: The plurality of scattering particles include one of the following or a combination thereof: zinc oxide particles, titanium dioxide particles, hollow silica particles, non-hollow silica particles, nano-silicate particles, and porogen particles.

20. The display panel according to claim 17, wherein: The refractive index of the low-refractive-index encapsulation sublayer is greater than or equal to 1.1 and less than or equal to 1.

4.

21. The display panel according to claim 10, wherein: The encapsulation layer closest to the quantum dot pattern includes the low refractive index encapsulation sublayer and the high refractive index encapsulation sublayer.

22. The display panel according to claim 10, wherein: n=1, or, n=2.

23. The display panel according to any one of claims 1 to 6, 11, 12, 14, 15, 18 to 22, wherein: The multiple light-emitting devices are blue light-emitting devices; the multiple sub-pixel areas include: multiple red sub-pixel areas, multiple blue sub-pixel areas, and multiple green sub-pixel areas; the quantum dot pattern is only located in the first opening area corresponding to the red sub-pixel area and the green sub-pixel area.

24. A display device, wherein: Comprising the display panel according to any one of claims 1 to 23.

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