Display panel and display device

Abstract

The present application relates to the technical field of display, and discloses a display panel and a display device. The display panel comprises a base substrate, a first light-emitting subpixel, and a second light-emitting subpixel. Light emitted by a first light-emitting device in the first light-emitting subpixel is converted by a first color conversion portion and then emitted, and light emitted by a second light-emitting device in the second light-emitting subpixel is scattered by a scattering portion and then emitted. Since scattering particles in the scattering portion can scatter the light of a first color emitted by the second light-emitting device, the range of a light-emitting angle of the second light-emitting subpixel is large, thereby improving, to some extent, the attenuation of the light as a viewing angle increases. In addition, since the thickness of a main body portion in the scattering portion is small, and / or the doping concentration of the scattering particles in the scattering portion is low, the scattering effect of the scattering portion on the light of the first color emitted by the second light-emitting device is reduced, the light-emitting efficiency of the second light-emitting subpixel is ensured, and the display effect of the display panel is improved.

Description

Display panel and display device Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel and display device. Background Technology

[0002] Organic light-emitting diode (OLED) display panels have the characteristics of self-illumination, wide viewing angle, wide color gamut, high contrast, foldability, flexibility, and thinness and portability, making them the main direction of research and development in the display field.

[0003] Summary of the Invention

[0004] This application provides a display panel and a display device, the technical solution of which is as follows:

[0005] On one hand, a display panel is provided, the display panel comprising:

[0006] Substrate;

[0007] A first light-emitting sub-pixel located on the substrate, the first light-emitting sub-pixel includes: a first light-emitting device and a first color conversion section located on the side of the first light-emitting device away from the substrate, the first light-emitting device is used to emit light of a first color, and the light of the first color emitted by the first light-emitting device is converted into light of a second color after passing through the first color conversion section and emitted.

[0008] A second light-emitting sub-pixel located on the substrate, the second light-emitting sub-pixel including: a second light-emitting device and a scattering portion located on the side of the second light-emitting device away from the substrate, the scattering portion including a main body and scattering particles doped in the main body, the second light-emitting device emitting light of a first color, the first color light emitted by the second light-emitting device being scattered by the scattering portion and then emitted.

[0009] The scattering portion satisfies at least one of the following conditions: the thickness of the main body portion is less than the thickness of the first color conversion portion; the doping concentration of the scattering particles is less than or equal to a concentration threshold.

[0010] Optionally, the thickness of the main body is less than or equal to 2 micrometers.

[0011] Optionally, the thickness of the main body is equal to 0 micrometers.

[0012] Optionally, the concentration threshold is less than or equal to 2%.

[0013] Optionally, the display panel further includes a light extraction layer located on the side of the first light-emitting device and the second light-emitting device away from the substrate.

[0014] The thickness of the first portion of the light extraction layer is less than the thickness of the second portion of the light extraction layer. The orthographic projection of the first portion on the substrate overlaps with the orthographic projection of the second light-emitting device on the substrate, and the orthographic projection of the second portion on the substrate overlaps with the orthographic projection of the first light-emitting device on the substrate.

[0015] Optionally, the thickness of the first portion of the light extraction layer ranges from 20 nanometers to 30 nanometers;

[0016] The thickness of the second portion of the light extraction layer ranges from 40 nanometers to 60 nanometers.

[0017] Optionally, both the first light-emitting device and the second light-emitting device include a first electrode, a light-emitting functional layer, and a second electrode; the first electrode of the first light-emitting device and the first electrode of the second light-emitting device are spaced apart, the light-emitting functional layer of the first light-emitting device and the light-emitting functional layer of the second light-emitting device are integrally configured to form a common light-emitting functional layer, and the second electrode of the first light-emitting device and the second electrode of the second light-emitting device are integrally configured to form a common electrode.

[0018] The thickness of the first electrode in the second light-emitting device is less than the thickness of the first electrode in the first light-emitting device.

[0019] Optionally, the thickness of the second electrode included in the second light-emitting device ranges from 7 nanometers to 8 nanometers;

[0020] The thickness of the second electrode included in the first light-emitting device ranges from 10 nanometers to 13 nanometers.

[0021] Optionally, the display panel further includes: a color conversion unit located on the side of the first light-emitting device and the second light-emitting device away from the substrate, the color conversion unit including at least the first color conversion part; the color conversion unit further includes:

[0022] A defined dam layer is provided, the defined dam layer including a first opening area corresponding to the first light-emitting device and a second opening area corresponding to the second light-emitting device, and the first color conversion part is located in the first opening area;

[0023] A light-shielding layer, the light-shielding layer including a first light-transmitting hole corresponding to the first opening area and a second light-transmitting hole corresponding to the second opening area;

[0024] A light filter layer, comprising a first light filter portion and a second light filter portion, wherein the first light filter portion and the first light-transmitting hole are correspondingly disposed, the first light filter portion being used to filter out light of other colors except for light of the second color, and the second light filter portion and the second light-transmitting hole being correspondingly disposed, wherein the second light filter portion being used to filter out light of other colors except for light of the first color.

[0025] Optionally, the thickness of the main body is equal to the thickness of the first color conversion part;

[0026] The first filter portion is located inside the first light-transmitting hole, and the second filter portion is located inside the second light-transmitting hole. The surfaces of the first filter portion near the substrate and the surfaces of the second filter portion near the substrate are located on the same plane.

[0027] Optionally, the thickness of the main body is less than the thickness of the first color conversion portion; the color conversion unit further includes: a planarization layer located on the side of the defining dam layer and the first color conversion portion away from the substrate, a portion of the planarization layer being located within the second opening region, and the surface of the planarization layer away from the substrate being planar;

[0028] The first filter portion is located inside the first light-transmitting hole, and the second filter portion is located inside the second light-transmitting hole. The surfaces of the first filter portion near the substrate and the surfaces of the second filter portion near the substrate are located on the same plane.

[0029] Optionally, the thickness of the main body is less than the thickness of the first color conversion part;

[0030] The second filter portion is located within the second opening region. The color conversion unit further includes: a planarization layer located on the side of the defined dam layer away from the substrate, wherein the first color conversion portion and the second filter portion are located away from the substrate, and the surface of the planarization layer away from the substrate is planar.

[0031] The first filter is located inside the first light-transmitting hole.

[0032] Optionally, the display panel further includes: a third light-emitting sub-pixel located on the substrate, the third light-emitting sub-pixel including: a third light-emitting device and a second color conversion section located on the side of the third light-emitting device away from the substrate, the third light-emitting device being used to emit light of a first color, the first color light emitted by the third light-emitting device being converted into third color light after passing through the second color conversion section and then emitted.

[0033] When the thickness of the main body is less than the thickness of the first color conversion part, the thickness of the main body is also less than the thickness of the second color conversion part.

[0034] Optionally, the first color is blue, and one of the second and third colors is red, while the other is green.

[0035] On the other hand, a display device is provided, the display device comprising: a power supply component and a display panel as described above;

[0036] The power supply component is connected to the display panel, and the power supply component is used to supply power to the display panel. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 is a partial cross-sectional schematic diagram of a display panel provided in an embodiment of this application;

[0039] Figure 2 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0040] Figure 3 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0041] Figure 4 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0042] Figure 5 is a schematic diagram of the stacking of a first light-emitting sub-pixel provided in an embodiment of this application;

[0043] Figure 6 is a schematic diagram of the stacking of a second light-emitting sub-pixel provided in an embodiment of this application;

[0044] Figure 7 is a schematic diagram of the stacking of a third light-emitting sub-pixel provided in an embodiment of this application;

[0045] Figure 8 is a brightness decay curve of each light-emitting sub-pixel as a function of the viewing angle, provided in an embodiment of this application.

[0046] Figure 9 is another brightness decay curve of each light-emitting sub-pixel as a function of the viewing angle, provided in an embodiment of this application.

[0047] Figure 10 is a bar chart of the luminous efficiency of a second light-emitting sub-pixel provided in an embodiment of this application;

[0048] Figure 11 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0049] Figure 12 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0050] Figure 13 is a brightness decay curve of each light-emitting sub-pixel as a function of the viewing angle, according to another embodiment of this application.

[0051] Figure 14 is a bar chart of the luminous efficiency of another second light-emitting sub-pixel provided in an embodiment of this application;

[0052] Figure 15 is a schematic diagram of the color shift curve of a second light-emitting sub-pixel provided in an embodiment of this application;

[0053] Figure 16 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0054] Figure 17 is a partial cross-sectional schematic diagram of another display panel provided in an embodiment of this application;

[0055] Figure 18 is a brightness decay curve of each light-emitting sub-pixel as a function of the viewing angle, according to another embodiment of this application.

[0056] Figure 19 is a bar chart of the luminous efficiency of another second light-emitting sub-pixel provided in an embodiment of this application;

[0057] Figure 20 is a schematic diagram of the color shift curve of another second light-emitting sub-pixel provided in an embodiment of this application;

[0058] Figure 21 is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0060] In some embodiments, quantum dot organic light emitting diode (QD-OLED) display panels have gradually become competitors to OLED display panels due to their advantages such as high light purity, high luminous quantum efficiency, and easily tunable emission color. A QD-OLED display panel includes red sub-pixels, green sub-pixels, and blue sub-pixels. The blue light emitted from the blue sub-pixels is emitted independently by a blue OLED device. The red light emitted from the red sub-pixels is emitted after being converted by red quantum dots from the blue OLED device. The green light emitted from the green sub-pixels is emitted after being converted by green quantum dots from the blue OLED device. The blue light emitted from the blue sub-pixels is emitted after being scattered by a scattering element from the blue OLED device.

[0061] However, the luminous efficiency of QD-OLED display panels in related technologies is relatively low, resulting in poor display performance.

[0062] Figure 1 is a schematic diagram of a display panel according to an embodiment of this application. Referring to Figure 1, the display panel 100 includes: a substrate 101, a first light-emitting sub-pixel 102, and a second light-emitting sub-pixel 103. Both the first light-emitting sub-pixel 102 and the second light-emitting sub-pixel 103 are located on the substrate 101.

[0063] The first light-emitting sub-pixel 102 includes a first light-emitting device 1021 and a first color conversion section 1022 located on the side of the first light-emitting device 1021 away from the substrate 101. The first light-emitting device 1021 emits light of a first color, and the light of the first color emitted by the first light-emitting device 1021 is converted into light of a second color after passing through the first color conversion section 1022 and then emitted. Optionally, the wavelengths of the first color light and the second color light are different.

[0064] The second light-emitting sub-pixel 103 includes a second light-emitting device 1031 and a scattering portion 1032 located on the side of the second light-emitting device 1031 away from the substrate 101. The scattering portion 1032 includes a main body 10321 and scattering particles 10322 doped in the main body 10321. The second light-emitting device 1031 emits light of a first color, and the light of the first color emitted by the second light-emitting device 1031 is emitted after being scattered by the scattering portion 1032.

[0065] Optionally, the main function of the scattering particles 10322 in the scattering section 1032 is to disperse the light of the first color emitted by the second light-emitting device 1031, thereby increasing the range of light emission angles of the second light-emitting sub-pixel 103 and improving the light attenuation caused by the increasing viewing angle. However, the scattering effect of the scattering particles 10322 in the scattering section 1032 on the light of the first color emitted by the second light-emitting device 1031 can lead to a lower amount of light at the frontal viewing angle of the second light-emitting sub-pixel 103, which may affect the luminous efficiency of the second light-emitting sub-pixel 103.

[0066] Therefore, in order to reduce the attenuation of light as the viewing angle increases while ensuring luminous efficiency, the scattering part 1032 can satisfy at least one of the following conditions: the thickness of the main body 10321 is less than the thickness of the first color conversion part 1022; and the doping concentration of the scattering particles 10322 is less than or equal to the concentration threshold.

[0067] In this embodiment, the thickness of the main body 10321 being less than the thickness of the first color conversion part 1022 indicates that the main body 10321 is thinner, which results in fewer scattering particles 10322 in the scattering part 1032. The doping concentration of the scattering particles 10322 in the scattering part 1032 being less than or equal to a concentration threshold indicates that there are fewer scattering particles 10322 in the scattering part 1032.

[0068] In other words, whether the thickness of the main body 10321 is designed to be thinner or the doping concentration of the scattering particles 10322 is designed to be lower, the number of scattering particles 10322 in the scattering part 1032 can be reduced. Therefore, fewer scattering particles 10322 can scatter the first color light emitted by the second light-emitting device 1031, reducing the scattering effect of the scattering part 1032 on the first color light emitted by the second light-emitting device 1031, ensuring the luminous efficiency of the second light-emitting sub-pixel 103, and improving the display effect of the display panel 100.

[0069] In summary, this application provides a display panel including a substrate and a first light-emitting sub-pixel and a second light-emitting sub-pixel disposed on the substrate. Light emitted from the first light-emitting device in the first light-emitting sub-pixel is converted by a first color conversion section before being emitted, and light emitted from the second light-emitting device in the second light-emitting sub-pixel is scattered by a scattering section before being emitted. Because the scattering particles in the scattering section can disperse the first-color light emitted by the second light-emitting device, the emission angle range of the light from the second light-emitting sub-pixel is larger, which has a certain effect on improving the attenuation of light as the viewing angle increases. Furthermore, because the thickness of the main body in the scattering section is relatively thin, and / or the doping concentration of the scattering particles in the scattering section is relatively low, the scattering effect of the scattering section on the first-color light emitted by the second light-emitting device is reduced, ensuring the luminous efficiency of the second light-emitting sub-pixel and improving the display effect of the display panel.

[0070] In this embodiment of the application, referring to FIG1, the display panel 100 further includes a third light-emitting sub-pixel 104 located on the substrate 101. The third light-emitting sub-pixel 104 includes a third light-emitting device 1041 and a second color conversion section 1042 located some distance from the substrate 101 of the third light-emitting device 1041. The third light-emitting device 1041 is used to emit light of a first color, and the light of the first color emitted by the third light-emitting device 1041 is converted into light of a third color after passing through the second color conversion section 1042.

[0071] The first light-emitting device 1021, the second light-emitting device 1031, and the third light-emitting device 1041 can all emit light of a first color. The first-color light emitted by the first light-emitting device 1021 is converted into second-color light by the first color conversion unit 1022 before being emitted, therefore the first light-emitting sub-pixel 102 can emit second-color light. The first-color light emitted by the second light-emitting device 1031 is not converted by the color conversion unit, therefore the second light-emitting sub-pixel 103 can emit first-color light. The first-color light emitted by the third light-emitting device 1041 is converted into third-color light by the second color conversion unit 1042 before being emitted, therefore the third light-emitting sub-pixel 104 can emit third-color light.

[0072] Optionally, the first color can be blue (B), and one of the second and third colors can be red (R), and the other can be green (G). For example, the second color is red, and the third color is green. That is, the light emitted by the first light-emitting sub-pixel 102 is red, the light emitted by the second light-emitting sub-pixel 103 is blue, and the light emitted by the third light-emitting sub-pixel 104 is green.

[0073] For example, the red light emitted by the first light-emitting sub-pixel 102, the blue light emitted by the second light-emitting sub-pixel 103, and the green light emitted by the third light-emitting sub-pixel 104 can be mixed to form white light.

[0074] Optionally, the first color conversion unit 1022 may include red quantum dots (R quantum dots, RQDs) for converting blue light into red light. Blue light emitted from the first light-emitting device 1021 is directed to the first color conversion unit 1022, where it is converted to red light by the red quantum dots within the unit. The second color conversion unit 1042 may include green quantum dots (G quantum dots, GQDs) for converting blue light into green light. Blue light emitted from the third light-emitting device 1041 is directed to the second color conversion unit 1042, where it is converted to green light by the green quantum dots within the unit.

[0075] Quantum dots emit specific colors of light by exciting blue light, thereby enhancing the color gamut and optimizing the viewing angle of a product. Furthermore, quantum dots possess the characteristic of wavelength tunable with particle size, ensuring uniform light emission and spectral purity. Thus, red and green light are obtained through color conversion using quantum dots, ensuring the color gamut and viewing angle of the display panel.

[0076] Optionally, quantum dot materials include materials from groups IIBVIA (IIVI), IIIAVA (IIIV), or IBIIIAVIA (IIIIVI). Examples of group IIVI quantum dot elements include: Zn (zinc), Cd (cadmium), Hg (mercury), O (oxygen), S (sulfur), Se (selenium), and Te (tellurium). Group IIIV quantum dot elements include: Al (aluminum), Ga (calcium), In (indium), Ti (titanium), N (nitrogen), P (phosphorus), As (arsenic), Sb (antimony), and Bi (bismuth). Group IIIIVI quantum dot elements include: Cu (copper), Ag (silver), Au (gold), Al (aluminum), Ga (calcium), In (indium), Ti (titanium), O (oxygen), S (sulfur), Se (selenium), and Te (tellurium).

[0077] In this embodiment, the first color conversion unit 1022 and the second color conversion unit 1042 may further include scattering particles. The material of the scattering particles may include at least one of TiO2 (titanium oxide), ZnO (zinc oxide), ZrO2 (zirconia), Al2O3 (aluminum oxide), and SiO2 (silicon oxide).

[0078] Optionally, the first color conversion unit 1022 also includes scattering particles for scattering light. When the blue light emitted by the first light-emitting device 1021 is directed to the first color conversion unit 1022, it is converted into red light by red quantum dots. The scattering particles scatter both the blue and red light, ensuring that more blue light is converted into red light by the red quantum dots and that the converted red light has a large emission angle, thus ensuring a wide viewing angle for the display panel 100.

[0079] Optionally, the second color conversion unit 1042 also includes scattering particles for scattering light. Here, the blue light emitted by the third light-emitting device 1041, after being directed to the second color conversion unit 1042, can be converted into green light by green quantum dots, and the scattering particles can scatter both blue and green light to ensure that more blue light can be converted into green light by the green quantum dots, and to ensure that the converted green light has a large emission angle, thereby ensuring a large viewing angle for the display panel 100.

[0080] In this embodiment, the thickness of the second color conversion section 1042 can be the same as the thickness of the first color conversion section 1022. When the thickness of the main body 10321 of the scattering section 1032 is less than the thickness of the first color conversion section 1022, the thickness of the main body 10321 of the scattering section 1032 is also less than the thickness of the second color conversion section 1042. This further ensures that there are fewer scattering particles 10322 in the scattering section 1032.

[0081] Referring to Figure 1, the display panel 100 further includes a color conversion unit 105. The color conversion unit 105 is located on the side of the first light-emitting device 1021, the second light-emitting device 1031, and the third light-emitting device 1041 away from the substrate 101. The color conversion unit 105 includes at least a first color conversion section 1022 and a second color conversion section 1042. That is, the first color conversion section 1022 and the second color conversion section 1042 can be part of the color conversion unit 105, and the first color conversion section 1022 and the second color conversion section 1042 can be collectively referred to as the color conversion layer m4.

[0082] The color conversion unit 105 further includes a defining dam layer (bank) m1, a light-shielding layer (BM) m2, and a filter layer m3. The filter layer m3 includes a first filter section m31, a second filter section m32, and a third filter section m33.

[0083] The defined dam layer m1 includes a first opening region K1 corresponding to the first light-emitting device 1021, a second opening region K2 corresponding to the second light-emitting device 1031, and a third opening region K3 corresponding to the third light-emitting device 1041. The first color conversion part 1022 is located within the first opening region K1, and the second color conversion part 1042 is located within the third opening region K3. Furthermore, if the thickness of the main body 10321 of the scattering part 1032 is not zero, the scattering part 1032 can be located within the second opening region K2.

[0084] The correspondence between the first opening region K1 and the first light-emitting device 1021 can be defined as follows: the orthographic projection of the first opening region K1 onto the substrate 101 covers the light-emitting area of ​​the first light-emitting device 1021. This ensures that the light of the first color emitted by the first light-emitting device 1021 can illuminate the first color conversion unit 1022 within the first opening region K1, thereby enabling the first color conversion unit 1022 to convert the first color light into second color light before emission.

[0085] The correspondence between the second opening region K2 and the second light-emitting device 1031 can mean that the orthogonal projection of the second opening region K2 onto the substrate 101 covers the light-emitting area of ​​the second light-emitting device 1031. This ensures that the light of the first color emitted by the second light-emitting device 1031 can reach the second opening region K2 and then be emitted. Alternatively, the light of the first color emitted by the second light-emitting device 1031 can reach the scattering portion 1032 of the second opening region K2 and then be emitted.

[0086] The correspondence between the third opening region K3 and the third light-emitting device 1041 can be described as follows: the orthographic projection of the third opening region K3 onto the substrate 101 covers the light-emitting area of ​​the third light-emitting device 1041. This ensures that the first color light emitted by the third light-emitting device 1041 can illuminate the second color conversion unit 1042 within the third opening region K3, thereby enabling the second color conversion unit 1042 to convert the first color light into the third color light before emission.

[0087] The light-shielding layer m2 is located on the side of the limiting dam layer m1 away from the substrate 101. The light-shielding layer m2 includes a first light-transmitting hole G1 corresponding to the first opening region K1, a second light-transmitting hole G2 corresponding to the second opening region K2, and a third light-transmitting hole G3 corresponding to the third opening region K3.

[0088] Specifically, the correspondence between the first light-transmitting aperture G1 and the first opening region K1 can be defined as follows: the orthographic projections of the first light-transmitting aperture G1 and the first opening region K1 on the substrate 101 overlap. Similarly, the correspondence between the second light-transmitting aperture G2 and the second opening region K2 on the substrate 101 can be defined as follows: the orthographic projections of the second light-transmitting aperture G2 and the second opening region K2 on the substrate 101 overlap. Likewise, the correspondence between the third light-transmitting aperture G3 and the third opening region K3 on the substrate 101 can be defined as follows: the orthographic projections of the third light-transmitting aperture G3 and the third opening region K3 on the substrate 101 overlap.

[0089] The first filter element m31 and the first light-transmitting aperture G1 are correspondingly disposed, and the orthographic projection of the first filter element m31 on the substrate 101 overlaps with the orthographic projection of the first light-transmitting aperture G1 on the substrate 101. For example, the first filter element m31 may be located within the first light-transmitting aperture G1. The first filter element m31 can be used to filter out light of colors other than the second color. Therefore, the first light-emitting sub-pixel 102 may further include the first filter element m31.

[0090] Optionally, the first filter m31 can be a red color block (RCF), which can transmit red light and absorb other colors of light. In this way, the light emitted from the first color conversion unit 1022 can pass through the first filter m31 before being emitted, and the first filter m31 can filter out light of colors other than red light, so as to ensure that the first light-emitting sub-pixel 102 (red sub-pixel) can filter out the blue light component. It should be noted that, in other possible implementations, the first filter m31 can also be a film layer for transmitting red light and reflecting blue light. In this way, after the light emitted from the first color conversion unit 1022 is directed to the first filter m31, the red light in these rays can pass through the first filter m31 and be emitted again, while the blue light in these rays can be reflected back to the first color conversion unit 1022 by the first filter m31. This allows the red quantum dots in the first color conversion unit 1022 to excite the blue light into red light, thereby further improving the excitation efficiency of the red quantum dots.

[0091] The second filter m32 and the second light-transmitting aperture G2 are correspondingly disposed, and the orthographic projection of the second filter m32 on the substrate 101 overlaps with the orthographic projection of the second light-transmitting aperture G2 on the substrate 101. For example, the second filter m32 may be located within the second light-transmitting aperture G2. The second filter m32 can be used to filter out light of colors other than the first color. Therefore, the second light-emitting sub-pixel 103 may further include the second filter m32.

[0092] Optionally, the second filter m32 can be a blue color block (BCF), which can transmit blue light and absorb other colors of light. In this way, the light of the first color emitted by the second light-emitting device 1031 can be emitted after passing through the second filter m32, and the second filter m32 can filter out light of other colors except blue light, so as to ensure that the second light-emitting sub-pixel 103 (blue sub-pixel) can emit relatively pure blue light.

[0093] The third filter m33 and the third light-transmitting aperture G3 are correspondingly disposed, and the orthographic projection of the third filter m33 on the substrate 101 overlaps with the orthographic projection of the third light-transmitting aperture G3 on the substrate 101. For example, the third filter m33 may be located within the third light-transmitting aperture G3. The third filter m33 can be used to filter out light of colors other than the third color. Therefore, the third light-emitting sub-pixel 104 may also include the third filter m33.

[0094] Optionally, the third filter m33 can be a green color block (GCF), which can transmit and filter light while absorbing other colors of light. In this way, the light emitted from the second color conversion unit 1042 can pass through the third filter m33 before exiting, and the third filter m33 can filter out light of colors other than green light, so as to ensure that the third light-emitting sub-pixel 104 (green sub-pixel) can filter out the blue light component. It should be noted that in other possible implementations, the third filter m33 can also be a film layer that transmits green light and reflects blue light. In this way, after the light emitted from the second color conversion unit 1042 is directed to the third filter m33, the green light in these rays can pass through the third filter m33 and then be emitted again, while the blue light in these rays can be reflected back to the second color conversion unit 1042 by the third filter m33. This allows the green quantum dots in the second color conversion unit 1042 to excite this blue light into red light, thereby further improving the excitation efficiency of the green quantum dots.

[0095] It should be noted that since the orthographic projection of each filter element in the filter layer m3 onto the substrate 101 overlaps with the orthographic projection of the corresponding light-transmitting hole in the light-shielding layer m2 onto the substrate 101, a portion of the light-shielding layer m2 is distributed between two adjacent filter elements in the filter layer m3 in a direction parallel to the extension surface of the substrate 101. In this way, light emitted from the side of a filter element in the filter layer m3 can be absorbed by the light-shielding layer m2, thereby ensuring that the light intensity emitted by each light-emitting sub-pixel towards adjacent light-emitting sub-pixels is low, effectively reducing the probability of color crosstalk in the display panel.

[0096] In this embodiment, as an optional implementation, referring to FIG2, the thickness of the main body 10321 of the scattering portion 1032 is equal to the thickness of the first color conversion portion 1022. In this case, the doping concentration of the scattering particles 10322 in the scattering portion 1032 is less than or equal to a concentration threshold. Optionally, the concentration threshold can be less than or equal to 2%. That is, the doping concentration of the scattering particles 10322 in the scattering portion 1032 is less than or equal to 2%. For example, the doping concentration of the scattering particles 10322 in the scattering portion 1032 can be 0, that is, the scattering portion 1032 is not doped with scattering particles 10322, and the scattering portion 1032 is only composed of the main body 10321, used to transmit the first color light emitted by the second light-emitting device 1031. In this case, the main body 10321 of the scattering portion 1032 does not have the effect of scattering light, but it can be formed in the second opening area K2 of the defined dam layer m1 by a printing process to play a filling role.

[0097] Referring to Figure 2, when the thickness of the main body 10321 of the scattering section 1032 is equal to the thickness of the first color conversion section 1022, the thickness of the main body of the scattering section 1032 can also be equal to the thickness of the second color conversion section 1042. In this case, the surfaces of the limiting dam layer m1, the first color conversion section 1022, the second color conversion section 1042, and the scattering section 1032 that are away from the substrate 101 are approximately planar. This allows the filter layer m3 in the color conversion unit 105 to be directly disposed on the limiting dam layer m1, the first color conversion section 1022, the second color conversion section 1042, and the scattering section 1032.

[0098] For example, the first filter m31 is located inside the first light-transmitting hole G1, the second filter m32 is located inside the second light-transmitting hole G2, and the third filter m33 is located inside the third light-transmitting hole G3. The first filter m31 is close to the surface of the substrate 101, the second filter m32 is close to the surface of the substrate 101, and the third filter m33 is close to the surface of the substrate 101, all of which are located on the same plane.

[0099] As an alternative implementation, referring to Figures 1 and 3, the thickness of the main body 10321 of the scattering portion 1032 is less than the thickness of the first color conversion portion 1022. Optionally, the thickness of the main body 10321 is less than or equal to 2 micrometers, and further, the thickness of the main body 10321 can be equal to 0 micrometers. A thickness of 0 micrometers for the main body 10321 can mean that the scattering portion 1032 is not required in the display panel 100. In this case, it is not necessary to print the main body within the second opening area K2 using a printing process.

[0100] Referring to Figures 1 and 3, when the thickness of the main body 10321 of the scattering portion 1032 is less than the thickness of the first color conversion portion 1022, the thickness of the main body 10321 of the scattering portion 1032 is also less than the thickness of the second color conversion portion 1042. In this case, the main body 10321 of the scattering portion 1032 is farther from the surface of the substrate 101, and closer to the substrate 101 than the surfaces of the first color conversion portion 1022 and the second color conversion portion 1042 that are farther from the substrate 101. Therefore, in order to ensure that the subsequent filter layer m3 is disposed on a plane, the color conversion unit 105 further includes a planarization layer m4 located on the side of the defining dam layer m1, the first color conversion portion 1022 and the second color conversion portion 1042 that are farther from the substrate 101. A portion of the planarization layer m4 may be located within the second opening region K2, and the surface of the planarization layer m4 that is farther from the substrate 101 is planar.

[0101] For example, both the light-shielding layer m2 and the light-filtering layer m3 are located on the side of the planarization layer m4 away from the substrate 101. The first light-filtering part m31 is located within the first light-transmitting hole G1, the second light-filtering part m32 is located within the second light-transmitting hole G2, and the third light-filtering part m33 is located within the third light-transmitting hole G3. The first light-filtering part m31, the second light-filtering part m32, and the third light-filtering part m33 are located on the same plane as the surfaces of the substrate 101. Optionally, the material of the planarization layer m4 can be an optical adhesive (OC) with a transmittance Tr greater than 95%.

[0102] Alternatively, referring to Figure 4, the second filter m32 is located within the second opening region K2. To ensure the placement of the first filter m31 and the third filter m33 in the subsequent filter layer m3, the color conversion unit 105 further includes a planarization layer m4 located on the side of the defining dam layer m1, the first color conversion layer 1021, and the second filter m32 away from the substrate 101. The surface of the planarization layer m4 away from the substrate 101 is planar.

[0103] For example, the first filter portion m31 and the third filter portion m33 in the light-shielding layer m2 and the light-filtering layer m3 are both located on the side of the planarization layer m4 away from the substrate 101. The first filter portion m31 is located in the first light-transmitting hole G1, and the third filter portion m33 is located in the third light-transmitting hole G3.

[0104] Since the second filter m32 is already disposed within the second opening region K2, it is not necessary to dispose of the second filter m32 within the second light-transmitting aperture G2. Referring to FIG4, the color conversion unit 105 also includes a filling portion m5 located within the second light-transmitting aperture G2. The filling portion m5 can be used to fill the second light-transmitting aperture G2, ensuring the flatness of the light-shielding layer m2 and the filter layer m3 away from the surface of the substrate 101. Optionally, the material of the filling portion m5 can be optical adhesive (OC).

[0105] In this case, instead of printing the main body within the second opening region K2 using a printing process, a second filter section m32 is formed within the second opening region K2 using a photolithography process. The thickness of the second filter section m32 ranges from 2 micrometers to 3 micrometers. It is then encapsulated using a protective encapsulation layer m6 and planarized using a planarization layer m4.

[0106] Referring to Figures 1 to 4, the color conversion unit 105 further includes an encapsulation protective layer m6 located between the color conversion layer and the filter layer m3. The encapsulation protective layer m6 can be made of an inorganic material to protect the color conversion layer. Optionally, the encapsulation protective layer m6 can be made of one or more inorganic oxides such as SiNx (silicon nitride), SiOx (silicon oxide), and SiOxNy (silicon oxynitride). Optionally, the encapsulation protective layer m6 is fabricated using a chemical vapor deposition (CVD) method.

[0107] In this embodiment of the application, referring to Figures 1 to 4, the display panel 100 further includes an encapsulation film layer 106 located on the side of the first light-emitting device 1021, the second light-emitting device 1031, and the third light-emitting device 1041 away from the substrate 101. For example, the encapsulation film layer 106 is located between the first light-emitting device 1021 and the color conversion unit 105, between the second light-emitting device 1031 and the color conversion unit 105, and between the third light-emitting device 1041 and the color conversion unit 105.

[0108] Optionally, the encapsulation film layer 106 includes a first encapsulation layer 1061, a second encapsulation layer 1062, and a third encapsulation layer 1063 stacked in a direction away from the substrate 101.

[0109] Optionally, the first encapsulation layer 1061 and the third encapsulation layer 1063 can be made of inorganic materials, and the second encapsulation layer 1062 can be made of organic materials. For example, the first encapsulation layer 1061 and the third encapsulation layer 1063 can be made of one or more inorganic oxides such as SiNx (silicon nitride), SiOx (silicon oxide), and SiOxNy (silicon oxynitride). The second encapsulation layer 1062 can be made of a resin material. The resin can be a thermoplastic resin or a thermosetting resin, where the thermoplastic resin can include acrylic resin (PMMA) and the thermosetting resin can include epoxy resin. Acrylic resin (PMMA) can also be called polymethyl methacrylate.

[0110] Optionally, the second encapsulation layer 1062 can be fabricated using inkjet printing (IJP). The first encapsulation layer 1061 and the third encapsulation layer 1063 can be fabricated using chemical vapor deposition (CVD). The first encapsulation layer 1061 can be referred to as CVD1 layer, and the second encapsulation layer 1062 can be referred to as CVD2 layer.

[0111] In this embodiment, the display panel 100 further includes a light modulation layer 107 located between the encapsulation film layer 106 and the color conversion unit 105. The refractive index of the light modulation layer 107 may be less than the refractive index of the color conversion units (first color conversion unit 1022 and second color conversion unit 1042). Optionally, the refractive index of the light modulation layer 107 may be in the range of 1.2 to 1.3, and the light modulation layer 107 may also be referred to as a low refractive index (LRI) layer. The refractive index of the color conversion unit may be in the range of 1.5 to 1.8.

[0112] The color conversion unit converts the light of the first color and then emits it from above, while some light also shines downwards. By setting the light modulation layer 107, at least a portion of the light emanating from the color conversion unit and shining onto the light modulation layer 107 can be totally reflected by the light modulation layer 107 before being emitted from the color conversion unit, thereby improving the light emission efficiency and enhancing the display effect of the display panel 100.

[0113] In this embodiment of the application, referring to Figures 1 to 4, the display panel 100 further includes a capping layer (CPL) 108. The capping layer 108 is located on the side of the first light-emitting device 1021 away from the substrate 101, on the side of the second light-emitting device 1031 away from the substrate 101, and on the side of the third light-emitting device 1041 away from the substrate 101.

[0114] The main functions of the light extraction layer 108 include: improving optical coupling efficiency, adjusting the light emission direction, improving device luminous efficiency, and enhancing device stability and lifespan. With the continuous development of OLED display technology, the research and development of materials for the light extraction layer 108 will continue to deepen, providing strong support for the sustained advancement of OLED display technology. Optionally, the material of the light extraction layer 108 can be a hole-type material, such as aromatic amines. Alternatively, the material of the optical extraction layer can also be an electronic-type material, such as oxazoles.

[0115] In the embodiments of this application, the first light-emitting device 1021, the second light-emitting device 1031 and the third light-emitting device 1041 each include a first electrode n1, a light-emitting functional layer n2 and a second electrode n3.

[0116] Optionally, the first electrodes n1 included in different light-emitting devices can be arranged at intervals. For example, any two of the first electrodes n1 included in the first light-emitting device 1021, the second light-emitting device 1031, and the third light-emitting device 1041 can be arranged at intervals.

[0117] Optionally, the light-emitting functional layer n2 included in different light-emitting devices can be integrally configured. For example, the light-emitting functional layer n2 included in the first light-emitting device 1021, the light-emitting functional layer n2 included in the second light-emitting device 1031, and the light-emitting functional layer n2 included in the third light-emitting device 1041 can be integrally configured to constitute a common light-emitting functional layer n2.

[0118] Optionally, the second electrode n3 of different light-emitting devices may be integrally disposed. For example, the second electrode n3 of the first light-emitting device 1021, the second electrode n3 of the second light-emitting device 1031, and the second electrode n3 of the third light-emitting device 1041 may be integrally disposed to form a common electrode.

[0119] In the embodiments of this application, each light-emitting device can be a top-emitting structure light-emitting device. The first electrode n1 can be called a total reflection anode, and the second electrode n3 can be called a semi-transparent semi-reflective cathode (CTD).

[0120] Optionally, the materials of the first electrode n1 and the second electrode n3 can be the same or different. The first electrode n1 can be made to exhibit total internal reflection characteristics by adjusting its material and thickness, while the second electrode n3 can be made to exhibit semi-transmissive and semi-reflective characteristics by adjusting its material and thickness. Generally, the thinner the electrode, the higher its transmittance; conversely, the thicker the electrode, the lower its transmittance. Therefore, the thickness of the first electrode n1 can be greater than the thickness of the second electrode n3.

[0121] For example, the material of the first electrode n1 may include at least one of Ag (silver), Mg (magnesium), Cu (copper), Al (aluminum), Pt (platinum), Pd (palladium), Au (gold), Ni (nickel), Nd (neodymium), Ir (iridium), Cr (chromium), Li (lithium), Ca (calcium), LiF (lithium fluoride) / Ca (calcium), LiF (lithium fluoride) / Al (aluminum), Mo (molybdenum), Ti (titanium), In (indium), Sn (tin), Zn (zinc), and Yb (ytterbium) or an oxide thereof. Alternatively, the first electrode n1 may also be a stacked structure, such as a triple stacked structure of ITO (indium tin oxide) / Ag (silver) / ITO (indium tin oxide).

[0122] For example, the material of the second electrode n3 may also include at least one of Ag (silver), Mg (magnesium), Cu (copper), Al (aluminum), Pt (platinum), Pd (palladium), Au (gold), Ni (nickel), Nd (neodymium), Ir (iridium), Cr (chromium), Li (lithium), Ca (calcium), LiF (lithium fluoride) / Ca (calcium), LiF (lithium fluoride) / Al (aluminum), Mo (molybdenum), Ti (titanium), In (indium), Sn (tin), Zn (zinc) and Yb (ytterbium) or oxides thereof.

[0123] In this embodiment of the application, referring to Figures 5 to 7, the light-emitting functional layer n2 may include: a hole inject layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a first light-emitting layer (EM1), a hole blocking layer (HBL), an electron transport layer (ETL), an N-type charge generation layer (N-CGL), and a P-type charge generation layer (P-CGL) stacked along a direction away from the substrate 101. The structure comprises a first light-emitting sub-pixel (EM2), a hole transport layer (HTL), an electron blocking layer (EBL), a second light-emitting layer (EM2), a hole blocking layer (HBL), an electron transport layer (ETL), an N-type charge generation layer (N-CGL), a P-type charge generation layer (P-CGL), a hole transport layer (HTL), an electron blocking layer (EBL), a third light-emitting layer (EM3), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL). Figure 5 is a schematic diagram of the stacked structure of a first light-emitting sub-pixel according to an embodiment of this application. Figure 6 is a schematic diagram of the stacked structure of a second light-emitting sub-pixel according to an embodiment of this application. Figure 7 is a schematic diagram of the stacked structure of a third light-emitting sub-pixel according to an embodiment of this application.

[0124] Optionally, the material of the hole transport layer may include any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials. The material of the hole injection layer may include a p-type dopant with a strong electron-withdrawing system and a hole transport material.

[0125] The materials of the first, second, and third luminescent layers may include a host luminescent material and a guest luminescent material doped in the host luminescent material. The materials of the first, second, and third luminescent layers may include a blue luminescent material exhibiting fluorescence properties at room temperature.

[0126] Optionally, the material of the electron transport layer may include any one or more of aromatic amine electron transport materials, dimethylfluorene electron transport materials, and carbazole electron transport materials. The material of the electron injection layer may include an n-type dopant with a strong electron-withdrawing system and an electron transport material.

[0127] N-type and P-type charge generation layers can form a PN junction. The N-type charge generation layer includes n-type doped materials, which are low work function metals doped with electron transport layer materials, such as Alq3 (aluminum hydroxyquinoline):Mg (magnesium) and Bphen (o-phenanthroline):Li (lithium). The P-type charge generation layer includes p-type doped materials, which primarily generate holes. These materials can be F4-TCNQ (tetracyanobenzoquinone dimethyl ether) and HAT-CN (hexaazatriphenylhexanitrile), among others.

[0128] In this embodiment, the light-emitting functional layer n2 includes three light-emitting layers, and this type of light-emitting device can be referred to as a three-layer light-emitting device. It should be noted that the three-layer light-emitting device is merely an illustrative scheme of this embodiment; therefore, the three-layer light-emitting device can improve the luminous efficiency and lifespan of the light-emitting device without making it too thick. Of course, the light-emitting functional layer n2 may also include one, two, four, or more light-emitting layers. This embodiment does not specifically limit the number of light-emitting layers included in the light-emitting functional layer n2.

[0129] This application uses an embodiment of a first electrode n1 comprising a stacked structure of Ag (silver) and ITO (indium tin oxide), and a second electrode n3 comprising Mg (magnesium) and Ag (silver) as examples. The thickness range of each film layer in the light-emitting device is illustrated in Table 1 below. The film layer diagram from top to bottom in Table 1 below represents the stacking relationship of the film layers.

[0130] Table 1

[0131] In this embodiment, referring to FIG8, the luminance of each light-emitting sub-pixel decreases with viewing angle (L-Decay) when the scattering part 1032 is not provided in the display panel or the scattering part 1032 does not contain scattering particles 10322. The horizontal axis in FIG8 represents the viewing angle in degrees (°). The vertical axis represents the luminance, with the luminance of 1 being 1 when the viewing angle is 0°.

[0132] Referring to Figure 8, it can be seen that due to the uniform light emission of quantum dots after excitation, the brightness of the first light-emitting sub-pixel 102 (red sub-pixel R) and the third light-emitting sub-pixel 104 (green sub-pixel G) does not change significantly with the viewing angle (from 0° to 60°) (e.g., brightness decay is less than 20%). However, the brightness of the second light-emitting sub-pixel 103 (blue sub-pixel B) changes more rapidly with the viewing angle because a strong microcavity is formed at the anode and cathode interfaces above and below the light-emitting functional layer n2. This results in the brightness of the mixed white light (W) decaying too quickly with the viewing angle.

[0133] To match the brightness decay curve of the blue sub-pixel with that of the red sub-pixel and the brightness decay region of the green sub-pixel, thereby optimizing the brightness decay region of white light, a scattering section 1032 can be provided above the second light-emitting device 1031, and a certain amount of scattering particles 10322 can be provided in the scattering section 1032. The function of the scattering particles 10322 is to uniformly disperse the blue light emitted by the second light-emitting device 1031, thereby achieving a uniform light emission effect in all directions. Referring to Figure 9, when a scattering section 1032 is provided above the second light-emitting device 1031, and a certain amount of scattering particles 10322 are provided in the scattering section 1032, the brightness of the second light-emitting sub-pixel 103 (blue sub-pixel) changes significantly slower with the viewing angle, thereby making the brightness of white light change slower with the viewing angle.

[0134] Taking a doping concentration of 4% for the scattering particles 1032 in the scattering section 1032 as an example, the luminous efficiency of the second light-emitting sub-pixel 103 under different thicknesses of the scattering section 1032 was simulated, as shown in Figure 10. Referring to Figure 10, it can be seen that when the thickness of the scattering section 1032 (which can refer to the thickness of the main body 10321) is 0 micrometers, the luminous efficiency of the second light-emitting sub-pixel 103 is 100%. When the thickness of the scattering section 1032 is 5 micrometers, the luminous efficiency of the second light-emitting sub-pixel 103 is 40%, which is a 60% decrease compared to the luminous efficiency when the thickness of the scattering section 1032 is 0 micrometers. When the thickness of the scattering section 1032 is 10 micrometers, the luminous efficiency of the second light-emitting sub-pixel 103 is 27%, which is a 73% decrease compared to the luminous efficiency when the thickness of the scattering section 1032 is 0 micrometers. When the thickness of the scattering portion 1032 is 15 micrometers, the luminous efficiency of the second light-emitting sub-pixel 103 is 25%, which is 75% lower than the luminous efficiency when the thickness of the scattering portion 1032 is 0 micrometers.

[0135] In this embodiment of the application, in order to improve the characteristic of the light emission brightness of the second light-emitting sub-pixel 103 changing with the viewing angle, a scattering part 1032 doped with scattering particles 10322 is provided above the second light-emitting device 1031. However, referring to FIG10 above, the scattering part 1032 provided above the second light-emitting device 1031 will have a significant impact on the light emission efficiency of the second light-emitting sub-pixel 103, which will lead to an increase in device power consumption.

[0136] Therefore, in order to improve the characteristic of the luminous brightness of the second light-emitting sub-pixel 103 decaying with the viewing angle, while ensuring the luminous efficiency of the second light-emitting sub-pixel 103, the embodiments of this application can design the thickness of the scattering part 1032 to be thinner, or design the doping concentration of the scattering particles 10322 in the scattering part 1032 to be smaller.

[0137] Optionally, the doping concentration of the scattering particles 10322 in the scattering section 1032 can be made zero. A doping concentration of zero for the scattering particles 10322 in the scattering section 1032 can also indicate that the scattering particle layer above the second light-emitting device 1031 has been removed. For example, the scattering section 1032 can be removed directly, or the main body 10321 of the scattering section 1032 can be retained, but the main body 10321 is not doped with scattering particles 10322.

[0138] In this embodiment, the microcavity intensity of the second light-emitting device 1031 has a certain influence on the light scattering effect of the second light-emitting device 1031. The stronger the microcavity intensity of the second light-emitting device 1031, the better the light scattering effect of the second light-emitting device 1031; the weaker the microcavity intensity of the second light-emitting device 1031, the worse the light scattering effect of the second light-emitting device 1031.

[0139] To reduce the significant decrease in luminous intensity as the viewing angle increases, the scattering effect of light from the second light-emitting device 1031 can be reduced by increasing the microcavity intensity of the second light-emitting device 1031.

[0140] Optionally, the microcavity of the second light-emitting device 1031 may include two parts. The first part 1081 microcavity may be composed of the first electrode n1, the second electrode n3 of the second light-emitting device 1031, and the light-emitting functional layer n2 between the first electrode n1 and the second electrode n3. The second part 1082 microcavity may be composed of the light extraction layer 108 between the second electrode n3 and the first encapsulation layer 1061 in the encapsulation film layer 106.

[0141] In order to improve the attenuation characteristics of the luminous brightness of the second light-emitting sub-pixel 103 with the viewing angle, the thickness of the light extraction layer 108 or the thickness of the second electrode n3 can be adjusted (for example, the thickness of the second electrode n3 of the second light-emitting device 1031 or the thickness of the light extraction layer 108 above the second light-emitting device 1031 can be reduced), thereby weakening the microcavity of the second light-emitting device 1031 and thus improving the phenomenon that the luminous brightness changes rapidly with the viewing angle.

[0142] In the first embodiment, referring to Figures 11 and 12, the thickness of the first portion 1081 of the light extraction layer 108 is less than the thickness of the second portion 1082 of the light extraction layer 108. The orthographic projection of the first portion 1081 onto the substrate 101 overlaps with the orthographic projection of the second light-emitting device 1031 onto the substrate 101. The orthographic projection of the second portion 1082 onto the substrate 101 overlaps with the orthographic projection of the first light-emitting device 1021 onto the substrate 101. That is, the thickness of the first portion 1081 of the light extraction layer 108 above the second light-emitting device 1031 is less than the thickness of the second portion 1082 of the light extraction layer 108 above the first light-emitting device 1021. Therefore, the microcavity intensity of the light extraction layer 108 above the second light-emitting device 1031 can be less than the microcavity intensity of the light extraction layer 108 above the first light-emitting device 1021, thereby reducing the scattering effect of the microcavity of the first portion 1081 on the light emitted by the second light-emitting device 1031. As shown in Figure 11, the light emission direction of the second light-emitting sub-pixel 103 is more biased towards the positive viewing angle, which can not only improve the luminous efficiency, but also avoid the viewing angle attenuation being too obvious.

[0143] In this embodiment, the thickness of the light extraction layer in the related technology is typically 50 nm to 60 nm. Using a thickness of 50 nm for the light extraction layer 108 as a baseline, the thickness of the first portion 1081 of the light extraction layer 108 is adjusted to obtain the attenuation of luminous intensity with viewing angle under different film thicknesses, as shown in Figure 13. The SP curve represents the attenuation curve of white light luminous intensity with viewing angle when the second light-emitting sub-pixel 103 includes a scattering portion 1032 doped with scattering particles 10322. The remaining curves represent the attenuation curves of luminous intensity of the second light-emitting sub-pixel 103 with viewing angle when the second light-emitting sub-pixel 103 does not include the scattering portion 1032 doped with scattering particles 10322, under different film thicknesses of the first portion 1081 of the light extraction layer 108. As can be seen from Figure 13, when the thickness of the first portion 1081 is gradually reduced from the 50 nm baseline, the attenuation of luminous intensity with viewing angle gradually improves. When the thickness of the first part 1081 is reduced to 30nm, the brightness decay curve is consistent with the brightness decay region of white light; when the thickness of the first part 1081 is further reduced to 20nm from the 30nm baseline, the change in luminous brightness with viewing angle will be further slowed down, which is more conducive to the optimization of the overall viewing angle of the device.

[0144] Figure 14 is a bar chart of the luminous efficiency of a second light-emitting sub-pixel provided in an embodiment of this application. The SP 50nm bars represent the luminous efficiency of the second light-emitting sub-pixel 103 when it includes a scattering portion 1032 doped with scattering particles 1032 and the thickness of the scattering portion 1032 is 50nm. The remaining bars represent the luminous efficiency of the second light-emitting sub-pixel 103 when it does not include the scattering portion 1032 doped with scattering particles 1032 and the first portion 1081 of the light extraction layer 108 has different film thicknesses. As can be seen from Figure 14, compared to the luminous efficiency of the second light-emitting sub-pixel 103 including the scattering portion 1032 doped with scattering particles 10322, thinning the thickness of the first portion 1081 of the light extraction layer 108 can effectively improve the luminous efficiency of the second light-emitting sub-pixel 103.

[0145] As shown in Figure 14, when the thickness of the first portion 1081 of the light extraction layer 108 is 50 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 100%. When the thickness of the first portion 1081 of the light extraction layer 108 is 40 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 80%. When the thickness of the first portion 1081 of the light extraction layer 108 is 30 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 57.5%. When the thickness of the first portion 1081 of the light extraction layer 108 is 20 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 45%. That is, the luminous efficiency of the second light-emitting sub-pixel 103 when the thickness of the first portion 1081 of the light extraction layer 108 is 30 nm can be 2.3 times the luminous efficiency of the second light-emitting sub-pixel 103 when the second light-emitting sub-pixel 103 includes a scattering portion 1032 doped with scattering particles 10322. The luminous efficiency of the second light-emitting sub-pixel 103 when the thickness of the first part 1081 of the light extraction layer 108 is 20 nm can be 1.8 times that of the second light-emitting sub-pixel 103 when the second light-emitting sub-pixel 103 includes a scattering part 1032 doped with scattering particles 10322.

[0146] Figure 15 is a schematic diagram of the color shift curve of a second light-emitting sub-pixel according to an embodiment of this application. The SP curve represents the color shift curve when the second light-emitting sub-pixel 103 includes a scattering portion 1032 doped with scattering particles 10322. The remaining curves represent the color shift curves when the second light-emitting sub-pixel 103 does not include the scattering portion 1032 doped with scattering particles 10321, and the first portion 1081 of the light extraction layer 108 has different film thicknesses. As can be seen from Figure 15, compared with the SP curve, gradually reducing the thickness of the first portion 1081 of the light extraction layer 108 from 50nm can achieve the effect of improving color shift. Optionally, when the thickness of the first portion 1081 of the light extraction layer 108 is 30nm or 20nm, the color shift curve of the second light-emitting sub-pixel 103 is approximately consistent with the SP curve and will not have a significant impact on the viewing color shift.

[0147] As can be seen from the above analysis, considering luminous efficiency, viewing angle attenuation, and color shift, the thickness of the first portion 1081 of the light extraction layer 108 can range from 20 nm to 30 nm, thereby ensuring that the brightness and color coordinates of the second light-emitting device 103 can match the changes with viewing angle with the quantum dot. Furthermore, the thickness of the second portion 1082 of the light extraction layer 108 ranges from 40 nm to 60 nm.

[0148] Optionally, during the fabrication of the display panel 100, to achieve a thickness difference design between the first portion 1081 of the light extraction layer 108 above the second light-emitting device 1031 and other portions above other light-emitting devices, a first sub-light extraction layer 108 with a thickness of 20nm to 30nm can be first deposited using an open mask. Then, a second sub-light extraction layer 108 with a thickness of 20nm to 30nm can be deposited using a fine metal mask (FMM) above the first light-emitting device 1021 and the third light-emitting device 1041. That is, the light extraction layer 108 can be fabricated using two processes. This allows the thickness range of the first portion 1081 of the light extraction layer 108 to be 20nm to 30nm, and the thickness range of the second portion 1082 of the light extraction layer 108 to be 40nm to 60nm.

[0149] Of course, the light extraction layer 108 can also be prepared using a halftone mask. This application does not specifically limit the preparation method of the light extraction layer 108.

[0150] The second approach involves designing the film thickness of the light extraction layer 108 above each light-emitting device without making differences, thereby reducing the thickness of the second electrode n3 of the second light-emitting device 1031, thus weakening the microcavity intensity of the second light-emitting device 1031, and improving the problem of the light emission brightness changing too quickly with the viewing angle.

[0151] For example, referring to Figures 16 and 17, the thickness of the second electrode n3 of the second light-emitting device 1031 is less than the thickness of the second electrode n3 of the first light-emitting device 1021, and the thickness of the second electrode n3 of the second light-emitting device 1031 is less than the thickness of the second electrode n3 of the third light-emitting device 1041. Therefore, the microcavity intensity of the second light-emitting device 1031 is less than the microcavity intensity of the first light-emitting device 1021, and less than the microcavity intensity of the third light-emitting device 1041, thereby reducing the scattering effect of the microcavity intensity of the second light-emitting device 1031 on the light emitted by the second light-emitting device 1031. As shown in Figure 16, the light emission direction of the second light-emitting sub-pixel 103 is more biased towards the positive viewing angle, which not only improves the luminous efficiency but also avoids excessive viewing angle attenuation.

[0152] In the embodiments of this application, the thickness of the second electrode of the light-emitting device in the related art is typically 11 nm to 13 nm. Taking a thickness of 12 nm for the second electrode n3 of the second light-emitting device 1031 as a baseline, the thickness of the second electrode n3 of the second light-emitting device 1031 was adjusted to obtain the attenuation of luminous intensity with viewing angle under different film thicknesses, as shown in Figure 18. The SP curve represents the attenuation curve of white light luminous intensity with viewing angle when the second light-emitting sub-pixel 103 includes a scattering portion 1032 doped with scattering particles 1032. The remaining curves represent the attenuation curves of luminous intensity of the second light-emitting sub-pixel 103 with viewing angle when the second electrode n3 of the second light-emitting device 1031 does not include the scattering portion 1032 doped with scattering particles 1032, under different film thicknesses. As can be seen from Figure 18, when the thickness of the second electrode n3 of the second light-emitting device 1031 is gradually reduced from a baseline of 50 nm, the attenuation of luminous intensity with viewing angle gradually improves. When the thickness of the second electrode n3 of the second light-emitting device 1031 is reduced to 8nm, the brightness decay curve is consistent with the brightness decay region of white light. When the thickness of the second electrode n3 of the second light-emitting device 1031 is further reduced to 7nm from the 8nm base, the change of luminous brightness with viewing angle will be further slowed down, which is more conducive to the optimization of the overall viewing angle of the device.

[0153] Figure 19 is a bar chart of the luminous efficiency of a second light-emitting sub-pixel provided in an embodiment of this application. The SP 12nm bars represent the luminous efficiency of the second light-emitting sub-pixel 103 when it includes a scattering portion 1032 doped with scattering particles 10322. The remaining bars represent the luminous efficiency of the second light-emitting sub-pixel 103 when it does not include the scattering portion 1032 doped with scattering particles 10322, and the second electrode n3 of the second light-emitting device 1031 has different film thicknesses. As can be seen from Figure 19, compared to the luminous efficiency of the second light-emitting sub-pixel 103 including the scattering portion 1032 doped with scattering particles 10322, thinning the thickness of the second electrode n3 of the second light-emitting device 1031 can effectively improve the luminous efficiency of the second light-emitting sub-pixel 103.

[0154] As shown in Figure 19, when the thickness of the second electrode n3 of the second light-emitting device 1031 is 12 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 100%. When the thickness of the first portion 1081 of the second electrode n3 of the second light-emitting device 1031 is 11 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 70%. When the thickness of the second electrode n3 of the second light-emitting device 1031 is 10 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 60%. When the thickness of the second electrode n3 of the second light-emitting device 1031 is 9 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 55%. When the thickness of the second electrode n3 of the second light-emitting device 1031 is 8 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 45%. When the thickness of the second electrode n3 of the second light-emitting device 1031 is 7 nm, the luminous efficiency of the second light-emitting sub-pixel 103 is 40%.

[0155] That is, the luminous efficiency of the second light-emitting sub-pixel 103 when the thickness of the second electrode n3 is 8nm can be 1.8 times that of the second light-emitting sub-pixel 103 when it includes the scattering portion 1032 doped with scattering particles 10322. The luminous efficiency of the second light-emitting sub-pixel 103 when the thickness of the second electrode n3 is 7nm can be 1.6 times that of the second light-emitting sub-pixel 103 when it includes the scattering portion 1032 doped with scattering particles 10322.

[0156] Figure 20 is a schematic diagram of the color shift curve of a second light-emitting sub-pixel provided in an embodiment of this application. The SP curve represents the color shift curve when the second light-emitting sub-pixel 103 includes a scattering portion 1032 doped with scattering particles 10322. The remaining curves represent the color shift curves when the second light-emitting sub-pixel 103 does not include the scattering portion 1032 doped with scattering particles 10322, and the second electrode n3 has different film thicknesses. As can be seen from Figure 20, compared with the SP curve, gradually reducing the thickness of the second electrode n3 from 12nm can improve the color shift effect. Optionally, when the thickness of the second electrode n3 of the second light-emitting device 1031 is 8nm or 7nm, the color shift curve of the second light-emitting sub-pixel 103 is approximately consistent with the SP curve and will not have a significant impact on the viewing color shift.

[0157] As can be seen from the above analysis, considering luminous efficiency, viewing angle attenuation, and color shift, the thickness of the second electrode n3 of the second light-emitting device 1031 can range from 7 nm to 8 nm, thereby ensuring that the brightness and color coordinates of the second light-emitting device 103 change with viewing angle can match those of the quantum dot. Furthermore, the thickness of the second electrode n3 of the first light-emitting device 1021 and the second electrode n3 of the third light-emitting device 1041 can range from 10 nm to 13 nm.

[0158] Optionally, in the fabrication process of the display panel, to achieve a thickness difference design between the second electrode n3 of the second light-emitting device 1031 and the second electrodes n3 of other light-emitting devices, a first sub-second electrode n3 with a thickness of 7nm to 8nm can be first deposited using an open mask. Then, a second sub-second electrode n3 with a thickness of 3nm to 5nm can be deposited on the first sub-second electrode n3 of the first light-emitting device 1021 and the third light-emitting device 1041 using a fine metal mask (FMM). That is, the second electrode n3 can be fabricated using two processes. This allows the thickness range of the second electrode n3 of the second light-emitting device 1031 to be 7nm to 8nm, and the thickness range of the second electrodes n3 of the first light-emitting device 1021 and the third light-emitting device 1041 to be 10nm to 13nm.

[0159] Of course, the second electrode n3 of each light-emitting device can also be fabricated using a halftone mask. This application does not specifically limit the fabrication method of the second electrode n3.

[0160] In this embodiment, the method of improving the luminous efficiency of the second light-emitting sub-pixel 103 by thinning the thickness of the light extraction layer 108 above the second light-emitting device 1031 or by thinning the thickness of the second electrode n3 of the second light-emitting device 1031 is merely illustrative. Optionally, the microcavity intensity of the second light-emitting device 1031 can be changed by simultaneously adjusting the thickness of both the light extraction layer 108 above the second light-emitting device 1031 and the thickness of the second electrode n3 of the second light-emitting device 1031, thereby adjusting the luminous efficiency of the second light-emitting sub-pixel 103. Alternatively, the microcavity intensity of the second light-emitting device 1031 can be adjusted by adjusting the transmittance and / or reflectance of the material of the second electrode n3 of the second light-emitting device 1031.

[0161] In summary, this application provides a display panel including a substrate and a first light-emitting sub-pixel and a second light-emitting sub-pixel disposed on the substrate. Light emitted from the first light-emitting device in the first light-emitting sub-pixel is converted by a first color conversion section before being emitted, and light emitted from the second light-emitting device in the second light-emitting sub-pixel is scattered by a scattering section before being emitted. Because the scattering particles in the scattering section can disperse the first-color light emitted by the second light-emitting device, the emission angle range of the light from the second light-emitting sub-pixel is larger, which has a certain effect on improving the attenuation of light as the viewing angle increases. Furthermore, because the thickness of the main body in the scattering section is relatively thin, and / or the doping concentration of the scattering particles in the scattering section is relatively low, the scattering effect of the scattering section on the first-color light emitted by the second light-emitting device is reduced, ensuring the luminous efficiency of the second light-emitting sub-pixel and improving the display effect of the display panel.

[0162] Figure 21 is a schematic diagram of a display device provided in an embodiment of this application. Referring to Figure 21, the display device may include a power supply component 200 and a display panel 100 provided in the above embodiment. The power supply component 200 can be used to supply power to the display panel 100.

[0163] Optionally, the display device can be any product or component with display and fingerprint recognition functions, such as an OLED display device, a quantum dot light emitting diode (QLED) display device, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame or navigator.

[0164] Since the display device can have essentially the same technical effects as the display panel described in the previous embodiments, for the sake of brevity, the technical effects of the display device will not be described again here.

[0165] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A display panel, characterized in that, The display panel includes: Substrate; A first light-emitting sub-pixel located on the substrate, the first light-emitting sub-pixel includes: a first light-emitting device and a first color conversion section located on the side of the first light-emitting device away from the substrate, the first light-emitting device is used to emit light of a first color, and the light of the first color emitted by the first light-emitting device is converted into light of a second color after passing through the first color conversion section and emitted. A second light-emitting sub-pixel located on the substrate, the second light-emitting sub-pixel including: a second light-emitting device and a scattering portion located on the side of the second light-emitting device away from the substrate, the scattering portion including a main body and scattering particles doped in the main body, the second light-emitting device emitting light of a first color, the first color light emitted by the second light-emitting device being scattered by the scattering portion and then emitted. The scattering portion satisfies at least one of the following conditions: the thickness of the main body portion is less than the thickness of the first color conversion portion; the doping concentration of the scattering particles is less than or equal to a concentration threshold.

2. The display panel according to claim 1, characterized in that, The thickness of the main body is less than or equal to 2 micrometers.

3. The display panel according to claim 2, characterized in that, The thickness of the main body is 0 micrometers.

4. The display panel according to claim 1, characterized in that, The concentration threshold is less than or equal to 2%.

5. The display panel according to any one of claims 1 to 4, characterized in that, The display panel further includes a light extraction layer located on the side of the first light-emitting device and the second light-emitting device away from the substrate. The thickness of the first portion of the light extraction layer is less than the thickness of the second portion of the light extraction layer. The orthographic projection of the first portion on the substrate and the second light-emitting device on the substrate... The orthographic projections of the second part on the substrate overlap, and the orthographic projection of the first light-emitting device on the substrate overlap.

6. The display panel according to claim 5, characterized in that, The thickness of the first portion of the light extraction layer ranges from 20 nanometers to 30 nanometers; The thickness of the second portion of the light extraction layer ranges from 40 nanometers to 60 nanometers.

7. The display panel according to any one of claims 1 to 4, characterized in that, Both the first light-emitting device and the second light-emitting device include a first electrode, a light-emitting functional layer, and a second electrode; the first electrode of the first light-emitting device and the first electrode of the second light-emitting device are spaced apart, the light-emitting functional layer of the first light-emitting device and the light-emitting functional layer of the second light-emitting device are integrally formed to constitute a common light-emitting functional layer, and the second electrode of the first light-emitting device and the second electrode of the second light-emitting device are integrally formed to constitute a common electrode. The thickness of the first electrode in the second light-emitting device is less than the thickness of the first electrode in the first light-emitting device.

8. The display panel according to claim 7, characterized in that, The second light-emitting device includes a second electrode with a thickness ranging from 7 nanometers to 8 nanometers; The thickness of the second electrode included in the first light-emitting device ranges from 10 nanometers to 13 nanometers.

9. The display panel according to any one of claims 1 to 4, characterized in that, The display panel further includes: a color conversion unit located on the side of the first light-emitting device and the second light-emitting device away from the substrate, the color conversion unit including at least the first color conversion part; the color conversion unit further includes: A defined dam layer is provided, the defined dam layer including a first opening area corresponding to the first light-emitting device and a second opening area corresponding to the second light-emitting device, wherein the first color conversion part is located within the first opening area; A light-shielding layer, the light-shielding layer including a first light-transmitting hole corresponding to the first opening area and a second light-transmitting hole corresponding to the second opening area; A filter layer, comprising a first filter portion and a second filter portion, wherein the first filter portion and the filter portion are... The first light-transmitting hole is correspondingly provided, and the first filter part is used to filter out light of other colors except for the second color light. The second filter part and the second light-transmitting hole are correspondingly provided, and the second filter part is used to filter out light of other colors except for the first color light.

10. The display panel according to claim 9, characterized in that, The thickness of the main body is equal to the thickness of the first color conversion part; The first filter portion is located inside the first light-transmitting hole, and the second filter portion is located inside the second light-transmitting hole. The surfaces of the first filter portion near the substrate and the surfaces of the second filter portion near the substrate are located on the same plane.

11. The display panel according to claim 9, characterized in that, The thickness of the main body is less than the thickness of the first color conversion part; the color conversion unit further includes: a planarization layer located on the side of the limiting dam layer and the first color conversion part away from the substrate, a portion of the planarization layer is located within the second opening area, and the surface of the planarization layer away from the substrate is planar; The first filter portion is located inside the first light-transmitting hole, and the second filter portion is located inside the second light-transmitting hole. The surfaces of the first filter portion near the substrate and the surfaces of the second filter portion near the substrate are located on the same plane.

12. The display panel according to claim 9, characterized in that, The thickness of the main body is less than the thickness of the first color conversion part; The second filter portion is located within the second opening region. The color conversion unit further includes: a planarization layer located on the side of the defined dam layer away from the substrate, wherein the first color conversion portion and the second filter portion are located away from the substrate, and the surface of the planarization layer away from the substrate is planar. The first filter is located inside the first light-transmitting hole.

13. The display panel according to any one of claims 1 to 4, characterized in that, The display panel further includes: a third light-emitting sub-pixel located on the substrate, the third light-emitting sub-pixel including: a third light-emitting device and a second color conversion section located on the side of the third light-emitting device away from the substrate, the third light-emitting device being used to emit light of a first color, the first color light emitted by the third light-emitting device being converted into third color light after passing through the second color conversion section and then emitted. When the thickness of the main body is less than the thickness of the first color conversion part, the thickness of the main body is also less than the thickness of the second color conversion part.

14. The display panel according to claim 13, characterized in that, The first color is blue, and one of the second and third colors is red, while the other is green.

15. A display device, characterized in that, The display device includes: a power supply component and a display panel as described in any one of claims 1 to 14; The power supply component is connected to the display panel, and the power supply component is used to supply power to the display panel.

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