Display panel and display device

Abstract

The invention discloses a display panel and a display device, which are used for improving the conversion rate of quantum dots. The embodiment of the invention provides a display panel, and the display panel comprises a substrate which comprises a plurality of sub-pixel regions which are arranged in an array manner along a first direction and a second direction; the first direction intersects with the second direction; the plurality of light-emitting devices are positioned on one side of the substrate and 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 reflectivity of the first pixel definition layer to light in a wave band range of 400-700 nanometers is greater than 20%; the first pixel definition layer comprises a first side surface surrounding the first opening area, and the first side surface is a concave surface recessed towards the first pixel definition layer; and the plurality of quantum dot patterns are located on the side, away from the substrate, of the light-emitting device and located in at least part of the first opening area.

Description

Technical Field

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

[0002] 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.

[0003] In the current QD-OLED devices with more mature technology, the QD layer is located above the OLED device 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. Summary of the invention

[0004] The embodiments of the present disclosure provide a display panel and a display device to improve the conversion rate of quantum dots.

[0005] An embodiment of the present disclosure provides a display panel, the display panel comprising:

[0006] The substrate comprises a plurality of pixel regions arranged in an array along a first direction and a second direction; the pixel region comprises a plurality of sub-pixel regions; the first direction intersects the second direction;

[0007] A plurality of light emitting devices are located on one side of the substrate and correspond to the sub-pixel areas one by one;

[0008] The 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 concave toward the first pixel definition layer;

[0009] 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.

[0010] 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.

[0011] In some embodiments, the first side surface is a portion of a spherical surface.

[0012] 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 in 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 thickness h1 of the first pixel definition layer in the direction perpendicular to the substrate satisfy:

[0013]

[0014] In some embodiments, in the first direction or in 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:

[0015]

[0016] In some embodiments, 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:

[0017]

[0018] In some embodiments, in the first direction or in 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]

[0020] 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.

[0021] In some embodiments, the display panel further comprises:

[0022] 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.

[0023] In some embodiments, the display panel further comprises:

[0024] 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;

[0025] The low-refractive-index encapsulation sublayers and the high-refractive-index encapsulation sublayers are arranged alternately.

[0026] In some embodiments, the high refractive index encapsulation sublayer includes an inorganic material.

[0027] In some embodiments, the high refractive index encapsulation sublayer includes one or a combination of the following: silicon nitride, silicon oxide, silicon oxynitride.

[0028] 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.

[0029] In some embodiments, the low refractive index encapsulation sublayer includes an organic material.

[0030] In some embodiments, 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, benzocyclobutene.

[0031] 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.

[0032] In some embodiments, at least one low refractive index encapsulation sublayer further includes a plurality of scattering particles.

[0033] In some embodiments, the mass percentage of the scattering particles is greater than or equal to 5% and less than or equal to 10%.

[0034] 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, porogen particles.

[0035] In some embodiments, 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.

[0036] 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.

[0037] In some embodiments, n=1, or n=2.

[0038] 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.

[0039] 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

[0040] 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.

[0041] Figure 1 A curve diagram showing the relationship between the conversion rate of the quantum dot pattern provided in the embodiment of the present disclosure and its film thickness;

[0042] Figure 2 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure;

[0043] Figure 3 A graph showing an OD value of a first pixel definition layer and an OD value of a black pixel definition layer provided in an embodiment of the present disclosure;

[0044] Figure 4 A reflectivity curve diagram of a black pixel definition layer and a first pixel definition layer provided in an embodiment of the present disclosure;

[0045] Figure 5 A schematic diagram of the structure of a display panel provided for related technologies;

[0046] Figure 6 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0047] Figure 7 A schematic diagram showing a comparison between a first side surface that is a portion of a spherical surface and a plane provided in an embodiment of the present disclosure;

[0048] Figure 8 A schematic diagram of a first opening area of ​​a display panel provided in an embodiment of the present disclosure;

[0049] Fig. 9 A schematic diagram of a first opening area of ​​another display panel provided by an embodiment of the present disclosure;

[0050] Fig.10 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0051] Fig.11 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0052] Fig.12 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0053] Fig.13 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0054] Fig.14 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0055] Fig.15 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0056] Fig.16 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0057] Fig.17 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0058] Fig.18 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0059] Fig.19 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0060] Fig. 20 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0061] Fig.21 A schematic diagram of a first opening area of ​​another display panel provided in an embodiment of the present disclosure;

[0062] Fig. 22 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0063] Fig.23 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0064] Fig.24 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0065] Fig.25 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0066] Fig.26 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0067] Fig. 27 A reflectivity curve diagram of a packaging layer for different wavebands provided in an embodiment of the present disclosure;

[0068] Fig.28 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0069] Fig.29 A reflectivity curve diagram of another packaging layer for different wavebands provided in an embodiment of the present disclosure;

[0070] Fig.30 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0071] Fig.31 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0072] Fig.32 A reflectivity curve diagram of another packaging layer for different wavebands provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In the related art, the pixel definition layer located on the same layer as the quantum dot pattern is usually a black pixel definition layer with 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 cured by UV is about 10 microns (μm) to 11 μm, that is, the thickness of the black pixel definition layer that can be cured by UV 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 as follows: Figure 1 As shown in the figure, within a certain thickness range, when the thickness of the quantum dot pattern does not exceed 15μm, the conversion rate of the quantum dot pattern increases with the increase of its film thickness, while the maximum thickness of the black pixel definition layer is much less than 15μm. Since the thickness of the black pixel definition layer is limited, 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.

[0077] The present disclosure provides a display panel. Figure 2 As shown, the display panel includes:

[0078] The 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 includes 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;

[0079] 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;

[0080] 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; the reflectivity of the first pixel definition layer 3 to light in the wavelength range of 400 nanometers to 700 nanometers is greater than 20%; the first pixel definition layer 3 includes: a first side surface 302 surrounding the first opening area 301, and the first side surface 302 is a concave surface concave toward the first pixel definition layer 3;

[0081] 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 .

[0082] 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 in at least a portion of the first opening area, that is, the first pixel definition layer and the plurality of quantum dot patterns are located in the same layer. Compared with 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, thereby, compared with the related art, the thickness of the first pixel definition layer can be increased, thereby increasing the thickness of the quantum dot pattern and increasing 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, i.e., the light emitting surface. The light reflected by the first side surface is fully utilized, thereby improving the light utilization rate of the display panel and the front light emitting efficiency.

[0083] In a specific implementation, the first pixel definition layer includes scattering particles, so that the film layer appears gray to obtain a gray pixel definition layer. The scattering particles include titanium oxide (TiO2) particles, for example.

[0084] In some embodiments, Figure 2 As shown, 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.

[0085] It should be noted that the pixel definition layer located in the same layer as the quantum dot pattern not only has the function of dividing sub-pixels, but also needs to have a high absorbance to prevent color crosstalk between adjacent quantum dot patterns. Usually, the detection unit of absorbance is expressed in OD value, OD stands for optical density, which indicates the optical density absorbed by the detected object, OD = lg (1 / T), T is the transmittance. The OD value of the first pixel definition layer, i.e. the gray pixel definition layer, and the OD value of the black pixel definition layer are as follows: Figure 3 As shown, it can be seen that in the blue light band, i.e., 400 nanometers (nm) to 480nm, the OD value of the first pixel definition layer is higher than that of the black pixel definition layer, and the OD of the first pixel definition layer is ≥1.6, that is, only 2% of the blue light can pass through the first pixel definition layer; in the green light band, i.e., 520nm to 570nm, the OD value of the black pixel definition layer is higher than that of the first pixel definition layer, and the OD value of the first pixel definition layer is close to 2, indicating that only 1% of the green light can pass through the first pixel definition layer; and in the red light band, i.e., 600nm to 690nm, the OD of the black pixel definition layer is almost the same as the OD value of the first pixel definition layer. According to Figure 3As can be seen from the above discussion, the first pixel definition layer has the same effect as the black pixel definition layer on light absorption in the 400nm-700nm 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.

[0086] It should be noted that in the display panel provided by the embodiment of the present disclosure, the quantum dot pattern 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 pattern is the same as the color of the sub-pixel area corresponding to the quantum dot pattern.

[0087] In some embodiments, the light emitting device is a blue light emitting device; Figure 2 As shown, the quantum dot pattern 4 is only located in the first opening area 301 corresponding to the red sub-pixel area R and the green sub-pixel area G.

[0088] 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.

[0089] 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 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).

[0090] In some embodiments, since the light emitting device is a blue light emitting device, such as Figure 2 As shown, the blue sub-pixel region B does not need to be provided with a quantum dot pattern and the display panel can also achieve full-color display.

[0091] In some embodiments, Figure 2 As shown, 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.

[0092] In a specific implementation, the light-transmitting filling structure includes, for example, a light-transmitting resin material.

[0093] It should be noted that if Figure 2As shown, 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 area B does not include the quantum dot pattern, the side surface of the first opening area 301 corresponding to the blue sub-pixel area B is a part of the spherical surface, and the front light emission efficiency of the blue sub-pixel area can still be improved. That is, the display panel provided by the embodiment of the present disclosure, the first side surface is a part of the spherical surface, which can improve the front light emission efficiency of each sub-pixel area, thereby improving the front light emission efficiency of the entire display panel, improving the display effect, and reducing power consumption.

[0094] It should be noted that the reflectivity of the black pixel definition layer and the first pixel definition layer is as follows: Figure 4 As shown, 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%. Figure 4 The above data 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.

[0095] In some embodiments, Figure 2 As shown, in the direction perpendicular to the base substrate 1, the cross-sectional area of ​​the first opening region 301 parallel to the plane of the base substrate 1 gradually increases. That is, the farther away from the base substrate 1, the larger the cross-sectional area of ​​the first pixel definition layer 3.

[0096] In related technologies, such as Figure 5 As shown, the side surface of the black pixel definition layer 10 surrounding the first opening area 301 is an inclined surface 1001, and the inclined surface 1001 faces the base substrate 1. Figure 4 It can be seen from the reflectivity curve of the black pixel definition layer that the light is almost completely absorbed after reaching the surface of the inclined surface 1001, which affects the light utilization rate of the display panel. Figure 5 The black pixel definition layer 10 shown is directly replaced by the first pixel definition layer 3 without changing the side shape, as shown in FIG. Figure 6 As shown, most of the light 11 reaching the first side surface 302 of the first pixel definition layer 3 is reflected toward the side of the substrate 1, and most of the reflected light still cannot be used to increase the front light extraction efficiency of the display panel.

[0097] The display panel provided by the embodiment of the present disclosure has a first side surface that is a concave surface, and a cross-sectional area of ​​the first opening region that is parallel to the plane of the substrate gradually increases, that is, the first side surface faces the front side of the display panel, so that the light reaching the concave surface is reflected and emitted more toward the front side of the display panel, thereby avoiding that the reflected light reaching the concave surface is mostly reflected to the back side of the display panel, thereby improving the light utilization rate and the front light emission efficiency of the display panel.

[0098] In some embodiments, Figure 2 As shown, the first side surface 302 is a portion of a spherical surface.

[0099] It should be noted that if Figure 7 As shown, 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 part of the spherical surface is different from the propagation direction of the light reaching the inclined plane. Figure 7 As shown, when the first side surface 302 is a part of the spherical surface 3021 facing the light-emitting side, the angle between the reflected light 11-1 of a part 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 part of the spherical surface 3021 facing the light-emitting side, it is more conducive to improving the front viewing angle and the viewing angle brightness in the Z direction of the display panel, and is conducive to improving the display effect.

[0100] In specific implementation, Figure 2 As shown, 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, and the first side surface 302 connects the first surface 303 and the second surface 304; the width of the first opening area 301 on the first surface 303 is d1, and the width of the first opening area 301 on the second surface 304 is d2. Half d2 / 2 of the width d2 of the first opening area 301 on the second surface 304 is equal to the radius r of the first side surface 302.

[0101] In a specific implementation, when making the first pixel definition layer, a whole layer of the first pixel definition layer can be formed first, and then a patterning process such as exposure and development can be used to form a plurality of patterns of the first opening areas. For example, a plurality of patterns of the first opening areas can be formed by multiple exposure processes so that the first side surface is a part of a spherical surface. The first exposure process can form a cross section of the first opening area in a direction perpendicular to the substrate into a rectangular shape, that is, after the one-side exposure process, the side surface of the first pixel definition layer surrounding the first opening area is perpendicular to the substrate. The second exposure process forms a first side surface of a part of a spherical surface with a radius of r=d2 / 2.

[0102] In some embodiments, Figure 2 As shown, 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 the direction perpendicular to the substrate 1 satisfy:

[0103]

[0104] The radius of the sphere

[0105] It should be noted that Figure 2 Only d1 and d2 in the first direction X are shown.

[0106] 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 μm and less than or equal to 20 μm.

[0107] In a specific implementation, in a direction perpendicular to the substrate, the thickness of the quantum dot pattern 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, Figure 1 As shown, the quantum dot pattern has a higher conversion rate.

[0108] Furthermore, in a direction perpendicular to the base substrate, a thickness h1 of the first pixel definition layer is greater than or equal to 10 μm and less than or equal to 15 μm.

[0109] It should be noted that if Figure 1 As shown, 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 the increase of the film thickness, and when the thickness of the quantum dot pattern is greater than 15μm, the conversion rate of the quantum dot pattern decreases with the increase of the film thickness. That is, 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. h1 is greater than or equal to 10μm and less than or equal to 15μm, which can avoid excessively increasing the thickness of the first pixel definition layer and the quantum dot pattern while ensuring that the quantum dot pattern has a high conversion rate, thereby avoiding excessively increasing the total thickness of the display panel.

[0110] 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.

[0111] In some embodiments, the shape of the orthographic projection of the first opening area 301 on the substrate is as follows: Figure 8 to Figure 21 shown.

[0112] For example, Figure 8 to Figure 11 As shown, the plurality of first opening regions 301 include a first sub-pixel opening region 3011, a second sub-pixel opening region 3012 and a third sub-pixel opening region 3013; the first sub-pixel opening region 3011, the second sub-pixel opening region 3012 and the third sub-pixel opening region 3013 correspond to different sub-pixel regions. Figure 8 As shown, 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; Fig. 9 As shown, 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; Fig.10 As shown, 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 overlap with the projection of the third sub-pixel opening area 3013, and 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; Fig.11 As shown, 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 connecting line of the first sub-pixel opening area 3011, the second sub-pixel opening area 3012 and the third sub-pixel opening area 3013 forms a triangle.

[0113] In specific implementation, Figure 8 , Fig. 9 , Fig.10 As shown, the areas of the first sub-pixel opening region 3011, the second sub-pixel opening region 3012 and the third sub-pixel opening region 3013 are not completely the same, or, as shown in FIG. Fig.11 As shown, the areas of the first sub-pixel opening region 3011 , the second sub-pixel opening region 3012 and the third sub-pixel opening region 3013 are exactly the same.

[0114] Or, in specific implementation, Figure 12 to Figure 16 As shown, at least part of the first opening area may also be in other shapes, such as Fig.12As shown, the first sub-pixel opening area 3011 and the third sub-pixel opening area 3013 are rectangular in shape, and the second sub-pixel opening area 3012 is L-shaped; Fig.11 As shown, the first sub-pixel opening area 3011 and the second sub-pixel opening area 3012 are L-shaped, and the third sub-pixel opening area 3013 is rectangular; Fig.14 , Fig.15 As shown, the first sub-pixel opening area 3011 and the second sub-pixel opening area 3012 are pentagonal in shape, and the third sub-pixel opening area 3013 is rectangular in shape; Fig.16 As shown, 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.

[0115] Or, in specific implementation, Figures 17 to 21 As shown, 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. Figure 17-18 As shown, 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 one 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; Fig.19 The first opening area 301 is shown to be an asymmetric octagon. Fig. 20 The first opening area 301 is shown to be hexagonal. Fig.21 The first opening area 301 is shown to be heptagonal.

[0116] In some embodiments, Figure 2 As shown, 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 width L1 of the first pixel definition layer 3 on the first surface 303 satisfy:

[0117]

[0118] It should be noted that if Figure 2 As shown, in the direction from the substrate substrate 1 to the first pixel definition layer 3, the cross-sectional area of ​​the first opening region 301 parallel to the plane direction of the substrate substrate 1 gradually increases, and accordingly, 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.

[0119] 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.

[0120] 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:

[0121]

[0122] 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:

[0123]

[0124] It should be noted that if Figure 2 As shown, 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 side of the display panel.

[0125] The display panel provided by the embodiment of the present disclosure, Right now 9.5°≤a1≤26.6°. Under the condition of ensuring that the sub-pixel has a large aperture ratio, the angle a1 can be made as large as possible, and the curvature of the first side surface can be increased, so that more light incident on the first side surface can be emitted toward the front of the display panel, thereby improving the front light emission efficiency of the display panel.

[0126] In a specific implementation, when the light emitting device is a blue light device and the first side surface of the first pixel definition layer is a part of a spherical surface, the light reaching the first side surface is reflected and the light path is changed so that the light is emitted in a direction perpendicular to or close to the direction perpendicular to the substrate, thereby improving the forward light emission efficiency of the display panel. Figure 5 The display panel provided by the prior art shown and the display panel provided by the embodiment of the present disclosure can improve the front light output efficiency corresponding to the red sub-pixel area and the green sub-pixel area by about 10%, and the front light output efficiency corresponding to the blue sub-pixel area by about 5%.

[0127] In some embodiments, Fig. 22 As shown, the display panel also includes:

[0128] The color filter layer 5 is located on the side of the quantum dot pattern 4 facing away from the base substrate 1 .

[0129] In some embodiments, Fig. 22 As shown, the color filter layer 5 includes: a light shielding layer 501 and a plurality of color resists 502;

[0130] 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 to the sub-pixel areas 101 one by one;

[0131] 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 .

[0132] In some embodiments, Fig. 22 As shown, the plurality of color resists 33 include: red color resists R′ corresponding to the red sub-pixel regions R one by one, a plurality of green color resists G′ corresponding to the green sub-pixel regions G one by one, and a plurality of blue color resists B′ corresponding to the blue sub-pixel regions B one by one.

[0133] In a specific implementation, the color resist includes a filter material, for example, a dye corresponding to the color of the sub-pixel.

[0134] 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 be reduced.

[0135] The display panel provided by the embodiment of the present disclosure has a color filter layer including a color resist disposed on the side of the quantum dot pattern away from the base substrate. The color resist can filter the blue light emitted by the quantum dot pattern to improve the color purity.

[0136] 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 resistance and the green color resistance 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 is 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, so the thickness of the color filter layer can be thinned, thereby reducing costs.

[0137] In some embodiments, Fig. 22 As shown, the thickness h2 of the color filter layer 5 in the direction perpendicular to the base substrate 1 is greater than or equal to 1 μm and less than or equal to 4 μm.

[0138] 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.

[0139] In some embodiments, Fig. 22 As shown, the display panel further includes: a quantum dot encapsulation layer 12 located between the quantum dot pattern 4 and the color filter layer 5 .

[0140] 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.

[0141] Next, an OLED light-emitting device is used as an example for explanation.

[0142] In some embodiments, Figure 2 , Fig. 22 As shown, the display panel also includes:

[0143] The encapsulation layer 6 is located between the first pixel definition layer 3 and the light emitting device 2;

[0144] The driving circuit layer 7 is located between the base substrate 1 and the light emitting device 2;

[0145] 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 one by one.

[0146] In some embodiments, Figure 2 , Fig. 22 As shown, the light-emitting device 2 includes an anode 201, a light-emitting functional layer 202, and a cathode 203 which are 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 integrally connected.

[0147] In some embodiments, the display panel may further include a light extraction layer between the cathode and the encapsulation layer.

[0148] 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.23 As shown, the pixel driving circuit includes a thin film transistor TFT and a storage capacitor (not shown); Fig.23 Only one thin film transistor TFT connected to the light emitting device 2 is shown in the figure. Of course, the pixel driving circuit may also 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; Fig.23As shown, the display substrate further includes: a buffer layer 13 located between the base substrate 1 and the active layer 701; the driving circuit layer 7 further 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 the drain D, and a first planarization layer 704 located between the light emitting device 2 and the source S and the drain D. The anode 203 is connected to the drain D through a via hole penetrating the first planarization layer 704. Fig.23 In the description, a thin film transistor TFT with a top gate structure is used as an example. Of course, the thin film transistor TFT can also be a bottom gate or other structure. When the thin film transistor is 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.

[0149] 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.

[0150] 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.

[0151] In some embodiments, Figure 2 , Fig. 22 As shown, the display panel includes a multi-layer encapsulation layer 6;

[0152] The multi-layer packaging layer 6 includes: a first packaging layer 6 - 1 , a second packaging layer 6 - 2 , and a third packaging layer 6 - 3 which are sequentially stacked on the side of the light emitting device 2 away from the base substrate 1 .

[0153] In specific implementation, Figure 2 , Fig. 22 The first encapsulation layer 6-1, the second encapsulation layer 6-2 and the third encapsulation layer 6-3 are all single-layer films.

[0154] In specific implementation, Figure 2 , Fig. 22 The first encapsulation layer 6 - 1 and the third encapsulation layer 6 - 3 are, for example, inorganic encapsulation layers, and the second encapsulation layer 6 - 2 is, for example, an organic encapsulation layer.

[0155] Or, in some embodiments, Figure 24 to Figure 26 As shown, at least one encapsulation layer 6 is a composite structure including multiple film layers.

[0156] In some embodiments, Figure 24 to Figure 26 As shown, the display panel includes a multi-layer encapsulation layer 6;

[0157] At least one encapsulation layer 6 in the multi-layer encapsulation layer 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; 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;

[0158] The low refractive index encapsulation sublayers 601 and the high refractive index encapsulation sublayers 602 are arranged alternately.

[0159] 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 1 low refractive index encapsulation sublayer and 2 high refractive index encapsulation sublayers.

[0160] In specific implementation, Figure 24 to Figure 26 As shown, when 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, the encapsulation sublayers on the side closest to the substrate 1 and the encapsulation sublayers on the side farthest from the substrate 1 in the encapsulation layer 6 are both high refractive index encapsulation sublayers 602.

[0161] 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 one side of the encapsulation layer. When the light propagates to the encapsulation layer, since at least one of the multiple 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 less than the refractive index of the high refractive index encapsulation sublayer, interference between the reflected light reflected 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 one side of the substrate can be reflected back to the front side and then emitted, which can improve the light utilization rate and thereby improve the brightness conversion rate of the quantum dot pattern.

[0162] In some embodiments, the high refractive index encapsulation sublayer includes an inorganic material.

[0163] In some embodiments, the high refractive index encapsulation sublayer includes one or a combination of the following: silicon nitride, silicon oxide, silicon oxynitride.

[0164] In some embodiments, the low refractive index encapsulation sublayer includes an organic material.

[0165] In some embodiments, 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, benzocyclobutene.

[0166] In specific implementation, 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 light reflectivity or transmittance within a specific wavelength range. For example, for the encapsulation layer including the low refractive index encapsulation sublayer and the high refractive index encapsulation sublayer, it can be set that the encapsulation layer has a higher reflectivity for red light and green light, so that the red light or green light emitted by the quantum dot pattern and propagating to one side of the substrate can be reflected back to the front side and then emitted, which can improve the light utilization rate and thus improve the brightness conversion rate of the quantum dot pattern.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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 of different layers may be the same or different, the refractive indices of the high-refractive-index encapsulation sublayers of different layers may be the same or different, and the thicknesses of the high-refractive-index encapsulation sublayers of 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 of different layers may be the same or different, the refractive indices of the low-refractive-index encapsulation sublayers of different layers may be the same or different, and the thicknesses of the low-refractive-index encapsulation sublayers of different layers may be the same or different.

[0172] In specific implementation, Figure 24 to Figure 26 As shown, 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 away from the substrate 1.

[0173] In specific implementation, Figure 24 to Figure 26 As shown, 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. Fig.24 As shown, 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 Fig.25As shown, the first encapsulation layer 6-1 and the third encapsulation layer 6-3 each include a low refractive index encapsulation sublayer 601 and a high refractive index encapsulation sublayer 602, or, as shown in FIG. Fig.26 As shown, only the third encapsulation layer 6 - 3 includes a low-refractive-index encapsulation sublayer 601 and a high-refractive-index encapsulation sublayer 602 .

[0174] In a specific implementation, the second encapsulation layer is, for example, an organic encapsulation layer. Fig.24 As shown, 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. Fig.26 As shown, 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.

[0175] 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, usually greater than or equal to 8 microns and less than or equal to 12 microns. When the encapsulation layer closest to the substrate, i.e., the first encapsulation layer, includes a low refractive index encapsulation sublayer and a high refractive index encapsulation sublayer, the 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, Fig.25 , Fig.26 As shown, 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, that is, the third encapsulation layer 6-3 includes a low refractive index encapsulation sublayer 601 and a high refractive index encapsulation sublayer 602, so that the 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 the loss of transmittance, which is more conducive to improving the light utilization and improving the brightness conversion rate of the quantum dot pattern.

[0176] In some embodiments, Figure 24 to Figure 26 As shown, n=1, that is, the encapsulation layer includes one low refractive index encapsulation sublayer 601 and two high refractive index encapsulation sublayers 602, 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.

[0177] Next, taking the third encapsulation layer including only one low-refractive-index encapsulation sublayer and two high-refractive-index encapsulation sublayers as an example, the reflectivity simulation results of the third encapsulation layer are introduced. The reflectivity curves of the encapsulation layer for different bands are shown in FIG. Fig. 27As shown, the reflectivity of the encapsulation layer for the green light band (wavelength range of 520nm~570nm) and the red light band (wavelength range of 600nm~690nm) is close to 20%, that is, about 20% of the green light and red light incident on the interface of the third encapsulation layer in the quantum dot pattern can be reflected, and the light path is changed, so that it is emitted from the front, thereby increasing the overall forward light output efficiency of the display panel. Fig. 27 In the figure, the reflectivity of the third encapsulation layer for the blue light band (wavelength range of 400nm ~ 480nm) is ≤2%, which can be ignored, and thus will not affect the blue light emitted by the light-emitting device passing through the encapsulation layer. It can be seen that setting the encapsulation layer as a composite structure of a low-refractive index encapsulation sublayer and a high-refractive index encapsulation sublayer can effectively improve the reflectivity of red and green light, thereby improving the light utilization rate to enhance the brightness conversion rate of the quantum dot pattern. When the third encapsulation layer includes 1 low-refractive index encapsulation sublayer and 2 high-refractive index encapsulation sublayers, the front light output efficiency of the red sub-pixel area and the green sub-pixel area of ​​the display panel is expected to increase by 12% and 15%, respectively.

[0178] 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 sublayers and the high-refractive index encapsulation sublayers, the stronger the total reflection effect at the interface between the two, which is more conducive to improving the reflectivity.

[0179] In some embodiments, Fig.28 As shown, at least one low refractive index encapsulation sublayer 601 further includes a plurality of scattering particles 6011 .

[0180] That is Fig.28 As shown, the low refractive index encapsulation sublayer 601 includes a substrate 6012 and a plurality of scattering particles 6011 .

[0181] 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, further increasing the refractive index difference between the low refractive index encapsulation sublayer and the high refractive index encapsulation sublayer, and being more conducive to improving the total reflection effect of the interface between the two and more conducive to improving the reflectivity.

[0182] In a specific implementation, the substrate is an organic material, and the substrate 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.

[0183] 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, porogen particles.

[0184] In some embodiments, 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.

[0185] 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.

[0186] In some embodiments, the mass percentage of the scattering particles is greater than or equal to 5% and less than or equal to 10%.

[0187] Next, taking the case where only the third encapsulation layer includes one low-refractive index encapsulation sublayer and two high-refractive index encapsulation sublayers, and the low-refractive index encapsulation sublayer includes scattering particles as an example, the reflectivity simulation results of the third encapsulation layer are introduced. The reflectivity curves of the encapsulation layer for different bands are shown in FIG. Fig.29 As shown, the reflectivity of the encapsulation layer for the green light band (wavelength range of 520nm~570nm) and the red light band (wavelength range of 600nm~690nm) is close to 25%, that is, about 25% of the green light and red light incident on the interface of the third encapsulation layer in the quantum dot pattern can be reflected, and the light path is changed, so that it is emitted from the front, thereby increasing the overall forward light output efficiency of the display panel. Fig.28 In the figure, the reflectivity of the third encapsulation layer for the blue light band (wavelength range of 400nm ~ 480nm) is ≤2%, which can be ignored, and thus will not affect the blue light emitted by the light-emitting device passing through the encapsulation layer. It can be seen that adding scattering particles to the low-refractive index encapsulation sublayer can effectively improve the reflectivity of red and green light, thereby improving the light utilization rate to enhance the brightness conversion rate of the quantum dot pattern. When the third encapsulation layer includes 1 low-refractive index encapsulation sublayer and 2 high-refractive index encapsulation sublayers, and the low-refractive index encapsulation sublayer includes scattering particles, the front light output efficiency of the red sub-pixel area and the green sub-pixel area of ​​the display panel is expected to increase by 13% and 16%, respectively.

[0188] It should be noted that Figure 24 to Figure 26 , Fig.28 The encapsulation layer includes one low refractive index encapsulation sublayer and two high refractive index encapsulation sublayers as an example for illustration. Of course, in a specific implementation, the encapsulation layer may also include more low refractive index encapsulation sublayers and more high refractive index encapsulation sublayers.

[0189] In some embodiments, Fig.30 , Fig.31 As shown, n=2. That is, the encapsulation layer 6 includes 2 low-refractive-index encapsulation sublayers and 3 high-refractive-index encapsulation sublayers, and the encapsulation layer 6 is a composite structure of 5 encapsulation sublayers.

[0190] It should be noted that Fig.30 , Fig.31In the embodiment, only the third encapsulation sublayer 6 - 3 includes two low-refractive-index encapsulation sublayers 601 and three high-refractive-index encapsulation sublayers 602 . Fig.30 In the embodiment, 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. Fig.31 As shown, both of the two low-refractive-index encapsulation sub-layers 601 include scattering particles.

[0191] Next, taking the case where only 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 as an example, the reflectivity simulation results of the third encapsulation layer are introduced. The reflectivity curves of the encapsulation layer for different wavelengths are shown in FIG. Fig.32 As shown, the reflectivity of the encapsulation layer for the green light band (wavelength range of 520nm~570nm) and the red light band (wavelength range of 600nm~690nm) is close to 32%, that is, about 32% of the green light and red light incident on the interface of the third encapsulation layer in the quantum dot pattern can be reflected, and the light path is changed, so that it is emitted from the front, thereby increasing the overall forward light output efficiency of the display panel. Fig.32 In the figure, the reflectivity of the third encapsulation layer for the blue light band (wavelength range of 400nm ~ 480nm) is ≤2%, which can be ignored, and thus will not affect the blue light emitted by the light-emitting device passing through the encapsulation layer. It can be seen that increasing the number of encapsulation sublayers to 5 layers can further improve the reflectivity of red and green light, thereby improving the light utilization rate to enhance the brightness conversion rate of the quantum dot pattern. When the third encapsulation layer includes 2 low-refractive index encapsulation sublayers and 3 high-refractive index encapsulation sublayers, and the low-refractive index encapsulation sublayer includes scattering particles, the front light output efficiency of the red sub-pixel area and the green sub-pixel area of ​​the display panel is expected to increase by 15% and 18%, respectively.

[0192] It should be noted that if the number of low-refractive-index encapsulation sublayers and high-refractive-index encapsulation sublayers included in the encapsulation layer continues to increase, it may cause optical waveguides between the low-refractive-index encapsulation sublayers and the high-refractive-index encapsulation sublayers in the encapsulation layer, and the thickness of the encapsulation layer may be too large to affect the transmittance, thereby affecting the overall gain of the display panel. In specific implementation, the number of low-refractive-index encapsulation sublayers and high-refractive-index encapsulation sublayers included in the encapsulation layer may be selected by comprehensively considering factors such as the reflectivity and transmittance of the encapsulation layer.

[0193] A display device provided by an embodiment of the present disclosure includes the display panel provided by an embodiment of the present disclosure.

[0194] 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.

[0195] In summary, the display panel and display device provided by the embodiment of the present disclosure have a first pixel definition layer having a first opening area, and the quantum dot pattern is located in at least part of the first opening area, that is, the first pixel definition layer and the plurality of quantum dot patterns are located in the same layer. Compared with 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, thereby, compared with the related art, the thickness of the first pixel definition layer can be increased, and then the thickness of the quantum dot pattern can be increased, and the conversion rate of the quantum dot pattern can be increased. In addition, the reflectivity of the first pixel definition layer is greater than the reflectivity of the black pixel definition layer, and 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, and the light emitted by the quantum dot pattern is reflected after reaching the concave surface. The propagation direction of the reflected light is at a smaller angle with the direction perpendicular to the substrate, that is, it is more conducive to making the light reaching the first side emerge along the vertical viewing angle of the display panel, making full use of the light reflected by the first side surface, and improving the front light output efficiency of the display panel.

[0196] 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.

[0197] 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 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.

Images