Display panel and display device

Abstract

A display panel and display device are disclosed. The display panel includes multiple pixel unit groups. Each pixel unit group includes adjacent first pixel units and second pixel units. The first pixel units and second pixel units each include multiple sub-pixels. Each sub-pixel includes a first electrode, a first light-emitting layer, a second light-emitting layer, and a second electrode stacked sequentially. Color light emitted by a sub-pixel forms a standing wave within the sub-pixel. Taking the plane of the first electrode facing the first light-emitting layer as a reference plane, the first light-emitting layer of a sub-pixel in the first pixel unit is located at the second inverse node of the standing wave, and the second light-emitting layer is located at the third inverse node of the standing wave. At least one sub-pixel in the second pixel unit has a first light-emitting layer located at the first inverse node of the standing wave, and a second light-emitting layer located at the second inverse node of the standing wave. By grouping adjacent first pixel units and second pixel units into a pixel unit group, the luminous efficiency can be improved while the viewing angle brightness attenuation can be reduced.

Description

Display panel and display device Technical Field

[0001] At least one embodiment of this disclosure relates to a display panel and a display device. Background Technology

[0002] A tandem organic light-emitting diode (TOLED) is a stacked device consisting of multiple light-emitting units connected in series. This type of stacked device has the characteristics of high efficiency and long lifespan. Summary of the Invention

[0003] At least one embodiment of this disclosure provides a display panel and a display device.

[0004] At least one embodiment of this disclosure provides a display panel, comprising: a plurality of pixel unit groups, each pixel unit group including adjacent first pixel units and second pixel units; the first pixel units and the second pixel units each including a plurality of sub-pixels, each sub-pixel including a first electrode, a first light-emitting layer, a second light-emitting layer and a second electrode stacked sequentially; colored light emitted by the sub-pixels forms a standing wave within the sub-pixels; wherein, taking the plane of the first electrode facing the first light-emitting layer as a reference plane, the standing wave includes a first inverse node, a second inverse node and a third inverse node formed sequentially along the reference plane, the first light-emitting layer of the sub-pixels in the first pixel unit is located at the second inverse node of the standing wave and the second light-emitting layer is located at the third inverse node of the standing wave; the first light-emitting layer of at least one sub-pixel of the second pixel unit is located at the first inverse node of the standing wave and the second light-emitting layer is located at the second inverse node of the standing wave.

[0005] For example, according to at least one embodiment of the present disclosure, the first light-emitting layer of all sub-pixels of the second pixel unit is located at the first inverse node of the standing wave, and the second light-emitting layer of all sub-pixels of the second pixel unit is located at the second inverse node of the standing wave.

[0006] For example, according to at least one embodiment of this disclosure, the first pixel unit and the second pixel unit include a plurality of sub-pixels, each including a first sub-pixel, a second sub-pixel, and a third sub-pixel; the first sub-pixel emits a first color light, the second sub-pixel emits a second color light, and the third sub-pixel emits a third color light, wherein the wavelength of the second color light is less than the wavelength of the first color light and greater than the wavelength of the third color light; the aperture ratio of the first sub-pixel of the first pixel unit is the same as the aperture ratio of the first sub-pixel of the second pixel unit; the aperture ratio of the second sub-pixel of the first pixel unit is the same as the aperture ratio of the second sub-pixel of the second pixel unit; and the aperture ratio of the third sub-pixel of the first pixel unit is the same as the aperture ratio of the third sub-pixel of the second pixel unit.

[0007] For example, according to at least one embodiment of this disclosure, the first pixel unit and the second pixel unit respectively include a first sub-pixel, a second sub-pixel, and a third sub-pixel; the first sub-pixel emits a first color light, the second sub-pixel emits a second color light, and the third sub-pixel emits a third color light, wherein the wavelength of the second color light is less than the wavelength of the first color light and greater than the wavelength of the third color light; the pixel unit group is configured to satisfy at least one of the following conditions: the aperture ratio of the first sub-pixel of the first pixel unit is different from the aperture ratio of the first sub-pixel of the second pixel unit; the aperture ratio of the second sub-pixel of the first pixel unit is different from the aperture ratio of the second sub-pixel of the second pixel unit; and the aperture ratio of the third sub-pixel of the first pixel unit is different from the aperture ratio of the third sub-pixel of the second pixel unit.

[0008] For example, according to at least one embodiment of this disclosure, the first pixel unit and the second pixel unit respectively include a first sub-pixel, a second sub-pixel, and a third sub-pixel; wherein, the first sub-pixel emits a first color light, and the first color light forms a first standing wave in the first sub-pixel; the second sub-pixel emits a second color light, and the second color light forms a second standing wave in the second sub-pixel; the third sub-pixel emits a third color light, and the third color light forms a third standing wave in the third sub-pixel; the wavelength of the second color light is less than the wavelength of the first color light and greater than the wavelength of the third color light.

[0009] For example, according to at least one embodiment of this disclosure, the first light-emitting layer of the first sub-pixel of the second pixel unit is located at the second inverse node of the first standing wave, and the second light-emitting layer of the first sub-pixel of the second pixel unit is located at the third inverse node of the first standing wave; the first light-emitting layer of the second sub-pixel of the second pixel unit is located at the first inverse node of the second standing wave, and the second light-emitting layer of the second sub-pixel of the second pixel unit is located at the second inverse node of the second standing wave; the first light-emitting layer of the third sub-pixel of the second pixel unit is located at the first inverse node of the third standing wave, and the second light-emitting layer of the third sub-pixel of the second pixel unit is located at the second inverse node of the third standing wave.

[0010] For example, according to at least one embodiment of the present disclosure, the aperture ratio of the first sub-pixel of the first pixel unit is the same as the aperture ratio of the first sub-pixel of the second pixel unit; the aperture ratio of the second sub-pixel of the first pixel unit is the same as the aperture ratio of the second sub-pixel of the second pixel unit; and the aperture ratio of the third sub-pixel of the first pixel unit is the same as the aperture ratio of the third sub-pixel of the second pixel unit.

[0011] For example, according to at least one embodiment of the present disclosure, the aperture ratio of the first sub-pixel of the first pixel unit is different from the aperture ratio of the first sub-pixel of the second pixel unit; the aperture ratio of the second sub-pixel of the first pixel unit is the same as the aperture ratio of the second sub-pixel of the second pixel unit; and the aperture ratio of the third sub-pixel of the first pixel unit is the same as the aperture ratio of the third sub-pixel of the second pixel unit.

[0012] For example, according to at least one embodiment of this disclosure, the first light-emitting layer of the first sub-pixel of the second pixel unit is located at the first inverse node of the first standing wave, and the second light-emitting layer of the first sub-pixel of the second pixel unit is located at the second inverse node of the first standing wave; the first light-emitting layer of the second sub-pixel of the second pixel unit is located at the first inverse node of the second standing wave, and the second light-emitting layer of the second sub-pixel of the second pixel unit is located at the second inverse node of the second standing wave; the first light-emitting layer of the third sub-pixel of the second pixel unit is located at the second inverse node of the third standing wave, and the second light-emitting layer of the third sub-pixel of the second pixel unit is located at the third inverse node of the third standing wave.

[0013] For example, according to at least one embodiment of the present disclosure, the aperture ratio of the first sub-pixel of the first pixel unit is the same as the aperture ratio of the first sub-pixel of the second pixel unit; the aperture ratio of the second sub-pixel of the first pixel unit is the same as the aperture ratio of the second sub-pixel of the second pixel unit; and the aperture ratio of the third sub-pixel of the first pixel unit is different from the aperture ratio of the third sub-pixel of the second pixel unit.

[0014] For example, according to at least one embodiment of this disclosure, the first light-emitting layer of the first sub-pixel of the second pixel unit is located at the first inverse node of the first standing wave, and the second light-emitting layer of the first sub-pixel of the second pixel unit is located at the second inverse node of the first standing wave; the first light-emitting layer of the second sub-pixel of the second pixel unit is located at the second inverse node of the second standing wave, and the second light-emitting layer of the second sub-pixel of the second pixel unit is located at the third inverse node of the second standing wave; the first light-emitting layer of the third sub-pixel of the second pixel unit is located at the first inverse node of the third standing wave, and the second light-emitting layer of the third sub-pixel of the second pixel unit is located at the second inverse node of the third standing wave.

[0015] For example, according to at least one embodiment of the present disclosure, the aperture ratio of the first sub-pixel of the first pixel unit is the same as the aperture ratio of the first sub-pixel of the second pixel unit; the aperture ratio of the second sub-pixel of the first pixel unit is different from the aperture ratio of the second sub-pixel of the second pixel unit; and the aperture ratio of the third sub-pixel of the first pixel unit is the same as the aperture ratio of the third sub-pixel of the second pixel unit.

[0016] For example, according to at least one embodiment of the present disclosure, each of the sub-pixels includes a capping layer; the display panel includes a substrate, and the plurality of pixel units are disposed on the substrate; the second electrode is located on the side of the first electrode away from the substrate, and the capping layer is located on the side of the second electrode away from the first electrode; the pixel unit group is configured to satisfy at least one of the following conditions: the thickness of the capping layer of the first sub-pixel of the first pixel unit is different from the thickness of the capping layer of the first sub-pixel of the second pixel unit; the thickness of the capping layer of the second sub-pixel of the first pixel unit is different from the thickness of the capping layer of the second sub-pixel of the second pixel unit; the thickness of the capping layer of the third sub-pixel of the first pixel unit is different from the thickness of the capping layer of the third sub-pixel of the second pixel unit.

[0017] For example, according to at least one embodiment of this disclosure, each sub-pixel further includes a hole transport layer located between the first electrode and the second electrode; the hole transport layer in the first pixel unit is configured such that the first light-emitting layer of the sub-pixel in the first pixel unit is located at the second inverse node of the standing wave and the second light-emitting layer is located at the third inverse node of the standing wave; the hole transport layer in the second pixel unit is configured such that the first light-emitting layer of at least one sub-pixel of the second pixel unit is located at the first inverse node of the standing wave and the second light-emitting layer is located at the second inverse node of the standing wave; the pixel unit group is configured to satisfy at least one of the following conditions: the thickness of the hole transport layer of the first sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the first sub-pixel of the second pixel unit; the thickness of the hole transport layer of the second sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the second sub-pixel of the second pixel unit; the thickness of the hole transport layer of the third sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the third sub-pixel of the second pixel unit.

[0018] At least one embodiment of this disclosure provides a display device including the display panel described in any of the above embodiments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0020] Figure 1 is a cross-sectional schematic diagram of a display panel provided in at least one embodiment of the present disclosure.

[0021] Figure 2 is a schematic diagram of the standing waves in the sub-pixels of the first pixel unit shown in Figure 1.

[0022] Figure 3 is a schematic diagram of the standing waves in the sub-pixels of the second pixel unit shown in Figure 1.

[0023] Figures 4 to 7 are schematic diagrams of standing waves in sub-pixels of the second pixel unit of a display panel provided in at least one embodiment of the present disclosure.

[0024] Figures 8 to 13 are schematic diagrams of the openings of sub-pixels of a display panel provided in different examples of at least one embodiment of the present disclosure.

[0025] Figure 14 is a schematic diagram of the cover layer of each sub-pixel of a display panel provided in an example of at least one embodiment of the present disclosure.

[0026] Figure 15 is a schematic diagram of the hole transport layer of each sub-pixel of a display panel provided in at least one embodiment of the present disclosure. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0028] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0029] The terms "parallel," "perpendicular," and "identical" as used in this disclosure include the strictly defined meanings of "parallel," "perpendicular," and "identical," as well as terms such as "approximately parallel," "approximately perpendicular," and "approximately identical," which include a certain degree of error. Taking into account measurement and errors associated with the measurement of a specific quantity (i.e., limitations of the measurement system), they represent acceptable deviations for a specific value as determined by a person skilled in the art. In embodiments of this disclosure, "center" can include a strictly defined location at the geometric center as well as a location approximately at the center within a small area surrounding the geometric center. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the value.

[0030] Some small- to medium-sized display devices employ strong microcavity structures, such as single-layer or tandem structures. For example, a two-layer tandem device stacks two OLED cells in series to achieve higher performance and efficiency.

[0031] Display devices employing strong microcavity structures have higher luminous efficiency, narrower color spectrum, and wider color gamut, but the enhanced wavelengths are concentrated in a relatively narrow range, which is disadvantageous in terms of viewing angle. Tandem structure display devices, due to their longer cavity length and narrower half-width, have fewer wavelengths that can compensate for each other after the viewing angle changes, resulting in a larger proportion of brightness decay at different viewing angles.

[0032] In their research, the inventors of this application discovered that the Tandem device exhibits different optical properties when the light-emitting layer in the OLED cell is located at different anti-node positions.

[0033] When the emitting layer is located at the first and second inverse nodes, the viewing angle brightness attenuation is small, but the luminous efficiency is low. When the emitting layer is located at the second and third inverse nodes, the luminous efficiency is high, but the viewing angle brightness attenuation is large.

[0034] Specifically, when the emitting layer is located at the second and third inverse nodes, the luminous efficiency of the tandem device can be improved. However, due to the increased cavity length and narrower half-width at half-maximum (HWHM), the number of peak wavelengths that can be enhanced in the microcavity decreases. When the user's viewing angle changes, the ability of different wavelengths of light to compensate for each other weakens, resulting in a significant decrease in viewing angle brightness. Therefore, increasing the number of wavelengths that enhance the microcavity peaks is particularly important. To increase the number of wavelengths in a single pixel, the microcavity can be weakened and the spectrum broadened, or the microcavity can be placed outside the location of the strongest interference. However, these methods of increasing the number of wavelengths lead to a loss of luminous efficiency.

[0035] Therefore, it is urgent to solve the problem of reduced viewing angle brightness caused by the increase in cavity length while improving luminous efficiency.

[0036] At least one embodiment of this disclosure provides a display panel including a plurality of pixel unit groups. Each pixel unit group includes an adjacent first pixel unit and a second pixel unit; the first pixel unit and the second pixel unit each include a plurality of sub-pixels, and each sub-pixel includes a first electrode, a first light-emitting layer, a second light-emitting layer, and a second electrode stacked sequentially; the colored light emitted by the sub-pixel forms a standing wave within the sub-pixel. Taking the plane of the first electrode facing the first light-emitting layer as a reference plane, the first light-emitting layer of the sub-pixel in the first pixel unit is located at the second inverse node of the standing wave and the second light-emitting layer is located at the third inverse node of the standing wave; the first light-emitting layer of at least one sub-pixel in the second pixel unit is located at the first inverse node of the standing wave and the second light-emitting layer is located at the second inverse node of the standing wave.

[0037] At least one embodiment of this disclosure provides a display device including the display panel described above.

[0038] The display panel and display device provided in at least one embodiment of this disclosure, wherein the first light-emitting layer of a sub-pixel in a first pixel unit is located at the second inverse node of a standing wave and the second light-emitting layer is located at the third inverse node of a standing wave, is beneficial to improving luminous efficiency. Furthermore, wherein the first light-emitting layer of at least one sub-pixel in a second pixel unit is located at the first inverse node of a standing wave and the second light-emitting layer is located at the second inverse node of a standing wave, is beneficial to mitigating the problem of large viewing angle brightness attenuation. Therefore, by grouping adjacent first and second pixel units as a pixel unit group, luminous efficiency can be improved while reducing viewing angle brightness attenuation.

[0039] The display panel and display device are described below with reference to the accompanying drawings and through some embodiments.

[0040] Figure 1 is a cross-sectional schematic diagram of a display panel provided in at least one embodiment of the present disclosure. Figure 2 is a schematic diagram of standing waves in a sub-pixel of the first pixel unit shown in Figure 1. Figure 3 is a schematic diagram of standing waves in a sub-pixel of the second pixel unit shown in Figure 1.

[0041] Referring to Figure 1, the display panel includes multiple pixel unit groups 10, and each pixel unit group 10 includes adjacent first pixel units 100 and second pixel units 200. Adjacent first pixel units and second pixel units mean that there are no other pixel units between the first pixel units and the second pixel units in a pixel unit group.

[0042] Referring to Figure 1, the first pixel unit 100 and the second pixel unit 200 each include a plurality of sub-pixels. For example, the first pixel unit 100 includes sub-pixels 101, 102, and 103, and the second pixel unit 200 includes sub-pixels 201, 202, and 203. Each sub-pixel (sub-pixels 101, 102, 103, 201, 202, 203 as shown in Figure 1) includes a first electrode (first electrode 1111, 1121, 1131, 2111, 2121, 2131 as shown in Figure 1), a first light-emitting layer (first light-emitting layer 1311, 1321, 1331, 2311, 2321, 2331 as shown in Figure 1), a second light-emitting layer (second light-emitting layer 1411, 1421, 1431, 2411, 2421, 2431 as shown in Figure 1), and a second electrode (second electrode 1211, 1221, 1231, 2211, 2221, 2231 as shown in Figure 1) stacked sequentially.

[0043] Referring to Figure 1, taking sub-pixel 101 in the first pixel unit 100 as an example, sub-pixel 101 includes a first electrode 1111, a first light-emitting layer 1311, a second light-emitting layer 1411, and a second electrode 1211 stacked together. For example, the first electrode 1111 is located on the light-emitting side of the first light-emitting layer 1311, and the first light-emitting layer 1311 is located between the first electrode 1111 and the second light-emitting layer 1211.

[0044] Referring to Figure 1, for example, the display panel further includes a substrate 01, and sub-pixels are arranged sequentially along a plane parallel to the substrate 01. For example, sub-pixels arranged in an array are disposed on the substrate 01.

[0045] For example, the first electrode is closer to the substrate than the second electrode. For example, the first electrode is a reflective electrode layer, and the second electrode is a transparent electrode layer or a semi-transparent and semi-reflective electrode layer. For example, the first electrode is an anode, and the second electrode is a cathode.

[0046] The colored light emitted by a sub-pixel forms a standing wave within that sub-pixel. For example, sub-pixels of different colors emit different colored light and form different standing waves. The colored light emitted by the first and second emissive layers propagates towards the first and second electrodes, respectively, and is reflected by the first and second electrodes. The light reflected by the two electrodes forms a standing wave between the first and second electrodes, and the period of the standing wave is (λ / 2*n), where λ is the wavelength of the light emitted by the emissive layer, and n is the effective refractive index of the medium between the first and second electrodes, n = (n1*d1 + n2*d2 + ...) / (d1 + d2 + ...), typically taken as n = 1.8.

[0047] For example, a standing wave includes nodes and antinodes. A node is the point in a standing wave with the smallest amplitude, while an antinode is the point in a standing wave with the largest amplitude. Nodes are also called nodal points, and antinodes are also called anti-nodal points.

[0048] For example, in each sub-pixel, the colors of the light emitted by the first emissive layer and the second emissive layer are essentially the same, which helps to improve the luminous efficiency of each pixel unit. For example, the ratio of the wavelength of the light emitted by the first emissive layer to the wavelength of the light emitted by the second emissive layer is 0.9-1.1. For example, the wavelengths of the light emitted by the first emissive layer and the wavelengths of the light emitted by the second emissive layer can be equal.

[0049] Referring to Figures 1 and 2, with the planes of the first electrodes 1111, 1121, 1131 facing the first light-emitting layers 1311, 1321, 1331 as reference planes S11, S12, S13, the standing wave includes first inverse nodes A11, A21, A31, second inverse nodes A12, A22, A32, and third inverse nodes A13, A23, A33 formed sequentially along the reference planes S11, S12, S13. For example, the first inverse node is closest to the reference plane, and the second inverse node is located between the first and third inverse nodes. In the first pixel unit 100, the first light-emitting layers 1311, 1321, 1331 of the sub-pixels 101, 102, 103 are located at the second inverse nodes A12, A22, A32 of the standing wave, and the second light-emitting layers 1411, 1421, 1431 are located at the third inverse nodes A13, A23, A33 of the standing wave.

[0050] Referring to Figures 1 and 3, the first emitting layer of at least one sub-pixel of the second pixel unit is located at the first inverse node of the standing wave and the second emitting layer is located at the second inverse node of the standing wave. For example, referring to Figure 3, the second pixel unit 200 may have only one sub-pixel 201 whose first emitting layer 2311 is located at the first inverse node B11 of the standing wave W21 and whose second emitting layer 2411 is located at the second inverse node B12 of the standing wave W21. For example, the first emitting layers 2321 and 2331 of sub-pixels 202 and 203 are located at the second inverse nodes B22 and B32 of the standing waves W22 and W23, and the second emitting layers 2421 and 2431 are located at the third inverse nodes B23 and B33 of the standing waves W22 and W23. For example, the second pixel unit may have two or more sub-pixels whose first emitting layers are located at the first inverse node of the standing wave and whose second emitting layers are located at the second inverse node of the standing wave. For example, in the second pixel unit, except for the sub-pixels where the first light-emitting layer is located at the first inverse node and the second light-emitting layer is located at the second inverse node, the first light-emitting layer of the other sub-pixels is located at the second inverse node and the second light-emitting layer is located at the third inverse node.

[0051] For example, if the emitting layer of each sub-pixel is located at the inverse node of its respective standing wave, then the light emitted by each emitting layer of a certain color will produce constructive interference to enhance the intensity of that color light. Positioning the first emitting layer of a sub-pixel in the first pixel unit at the second inverse node of the standing wave and the second emitting layer at the third inverse node of the standing wave improves luminous efficiency. Positioning the first emitting layer of at least one sub-pixel in the second pixel unit at the first inverse node of the standing wave and the second emitting layer at the second inverse node of the standing wave helps to mitigate the problem of large viewing angle brightness attenuation. Therefore, by grouping adjacent first and second pixel units as a pixel unit group, the positions of the first and second emitting layers of the sub-pixels in the two pixel units can be adjusted separately, thereby improving luminous efficiency while reducing viewing angle brightness attenuation.

[0052] Since the light-emitting layers (e.g., the first light-emitting layer and the second light-emitting layer) have a certain thickness, the light-emitting layers of each sub-pixel in this embodiment are all located at the inverse node of their respective standing waves, including the inverse node of the standing waves of each sub-pixel being located exactly in each light-emitting layer, or located outside each light-emitting layer but very close to the light-emitting layer.

[0053] For example, the first electrode may include a metallic material, such as an opaque metal layer formed of aluminum, copper, molybdenum, titanium, platinum, nickel, chromium, silver, gold, tungsten, magnesium, or alloys thereof. For example, the first electrode may include stacked indium tin oxide, silver, or indium tin oxide (ITO / Ag / ITO).

[0054] For example, the second electrode may include a semi-transparent metal layer, such as a semi-transparent film layer formed of aluminum, copper, molybdenum, titanium, platinum, nickel, chromium, silver, gold, tungsten, or their alloys. For example, the first electrode may also include a semi-transparent composite electrode formed of a metal and a transparent electrode layer (e.g., indium tin oxide, indium zirconium oxide, aluminum zirconium oxide, zirconium oxide, etc.). For example, the second electrode may include a magnesium-silver alloy (MgAg).

[0055] For example, the second electrode may include a transparent material, such as indium tin oxide, indium zirconium oxide, alumina zirconium oxide, zirconium oxide, etc.

[0056] For example, in a direction perpendicular to the substrate, the spacing between the second light-emitting layer and the second electrode is less than 500 angstroms to facilitate voltage reduction.

[0057] Referring to Figures 1 to 3, in some examples, the first pixel unit 100 and the second pixel unit 200 include multiple sub-pixels, including first sub-pixels 101 and 201, second sub-pixels 102 and 202, and third sub-pixels 103 and 203, respectively. The first sub-pixels 101 and 201 emit a first color light R, the second sub-pixels 102 and 202 emit a second color light G, and the third sub-pixels 103 and 203 emit a third color light B. The wavelength of the second color light G is shorter than the wavelength of the first color light R and longer than the wavelength of the third color light B. For example, the first sub-pixel 101 is a red sub-pixel emitting red light, the second sub-pixel 102 is a green sub-pixel emitting green light, and the third sub-pixel 103 is a blue sub-pixel emitting blue light.

[0058] In some examples, first sub-pixels 101 and 201 emit a first color light R, which forms first standing waves W11 and W21 within the first sub-pixels 101 and 201. For example, a red sub-pixel emits red light, which forms a red standing wave within the red sub-pixel. Second sub-pixels 102 and 202 emit a second color light G, which forms second standing waves W12 and W22 within the second sub-pixels 102 and 202. For example, a green sub-pixel emits green light, which forms a green standing wave within the green sub-pixel. Third sub-pixels 103 and 203 emit a third color light B, which forms third standing waves W11 and W13 within the third sub-pixels 103 and 203. For example, a blue sub-pixel emits blue light, which forms a blue standing wave within the blue sub-pixel.

[0059] Figures 4 to 7 are schematic diagrams of standing waves in sub-pixels of the second pixel unit of a display panel provided in at least one embodiment of the present disclosure.

[0060] Referring to Figure 4, in some examples, the first emitting layers 2311, 2321, 2331 of all sub-pixels 201, 202, 203 of the second pixel unit 200 are located at the first inverse nodes B11, B21, B31 of the standing waves W21, W22, W23, and the second emitting layers 2411, 2421, 2431 of all sub-pixels 201, 202, 203 of the second pixel unit 200 are located at the second inverse nodes B12, B22, B32 of the standing waves. For example, in the second pixel unit, the first emitting layer of the red sub-pixel is located at the first inverse node of the red standing wave, the first emitting layer of the green sub-pixel is located at the first inverse node of the green standing wave, and the first emitting layer of the blue sub-pixel is located at the first inverse node of the blue standing wave. For example, in the second pixel unit, the second emitting layer of the red sub-pixel is located at the second inverse node of the red standing wave, the second emitting layer of the green sub-pixel is located at the second inverse node of the green standing wave, and the second emitting layer of the blue sub-pixel is located at the second inverse node of the blue standing wave.

[0061] Referring to Figure 5, in some examples, the first light-emitting layer 2311 of the first sub-pixel 201 of the second pixel unit 200 is located at the second inverse node B12 of the first standing wave W21, and the second light-emitting layer 2411 of the first sub-pixel 201 of the second pixel unit 200 is located at the third inverse node B13 of the first standing wave W21. The first light-emitting layer 2321 of the second sub-pixel 202 of the second pixel unit 200 is located at the first inverse node B21 of the second standing wave W21, and the second light-emitting layer 2421 of the second sub-pixel 202 of the second pixel unit 200 is located at the second inverse node B22 of the second standing wave W21. The first light-emitting layer 2331 of the third sub-pixel 203 of the second pixel unit 200 is located at the first inverse node B31 of the third standing wave W23, and the second light-emitting layer 2431 of the third sub-pixel 203 of the second pixel unit 200 is located at the second inverse node B32 of the third standing wave W23.

[0062] For example, in the second pixel unit, the first and second light-emitting layers of the red sub-pixel are located at the second and third inverse nodes of the red standing wave, respectively; the first and second light-emitting layers of the green sub-pixel are located at the first and second inverse nodes of the green standing wave, respectively; and the first and second light-emitting layers of the blue sub-pixel are located at the first and second inverse nodes of the blue standing wave, respectively.

[0063] Referring to Figure 6, in some examples, the first light-emitting layer 2311 of the first sub-pixel 201 of the second pixel unit 200 is located at the first inverse node B11 of the first standing wave W21, and the second light-emitting layer 2411 of the first sub-pixel 201 of the second pixel unit 200 is located at the second inverse node B12 of the first standing wave W21. The first light-emitting layer 2321 of the second sub-pixel 202 of the second pixel unit 200 is located at the first inverse node B21 of the second standing wave W22, and the second light-emitting layer 2421 of the second sub-pixel 202 of the second pixel unit 200 is located at the second inverse node B22 of the second standing wave W22. The first light-emitting layer 2331 of the third sub-pixel 203 of the second pixel unit 200 is located at the second inverse node B32 of the third standing wave W23, and the second light-emitting layer 2431 of the third sub-pixel 203 of the second pixel unit 200 is located at the third inverse node B33 of the third standing wave W23.

[0064] For example, in the second pixel unit, the first and second light-emitting layers of the red sub-pixel are located at the first and second inverse nodes of the red standing wave, respectively; the first and second light-emitting layers of the green sub-pixel are located at the first and second inverse nodes of the green standing wave, respectively; and the first and second light-emitting layers of the blue sub-pixel are located at the second and third inverse nodes of the blue standing wave, respectively.

[0065] Referring to Figure 7, in some examples, the first light-emitting layer 2311 of the first sub-pixel 201 of the second pixel unit 200 is located at the first inverse node B11 of the first standing wave W21, and the second light-emitting layer 2411 of the first sub-pixel 201 of the second pixel unit 200 is located at the second inverse node B12 of the first standing wave W21. The first light-emitting layer 2321 of the second sub-pixel 202 of the second pixel unit 200 is located at the second inverse node B22 of the second standing wave W22, and the second light-emitting layer 2421 of the second sub-pixel 202 of the second pixel unit 200 is located at the third inverse node B23 of the second standing wave W22. The first light-emitting layer 2331 of the third sub-pixel 203 of the second pixel unit 200 is located at the first inverse node B31 of the third standing wave W23, and the second light-emitting layer 2431 of the third sub-pixel 203 of the second pixel unit 200 is located at the second inverse node B32 of the third standing wave W23.

[0066] For example, in the second pixel unit, the first and second light-emitting layers of the red sub-pixel are located at the first and second inverse nodes of the red standing wave, respectively; the first and second light-emitting layers of the green sub-pixel are located at the second and third inverse nodes of the green standing wave, respectively; and the first and second light-emitting layers of the blue sub-pixel are located at the first and second inverse nodes of the blue standing wave, respectively.

[0067] Figures 8 to 13 are schematic diagrams of the openings of sub-pixels of a display panel provided in different examples of at least one embodiment of the present disclosure.

[0068] Referring to Figure 8, in some examples, the aperture ratio of the first sub-pixel 101 of the first pixel unit 100 is the same as that of the first sub-pixel 201 of the second pixel unit 200, the aperture ratio of the second sub-pixel 102 of the first pixel unit 100 is the same as that of the second sub-pixel 202 of the second pixel unit 200, and the aperture ratio of the third sub-pixel 103 of the first pixel unit 100 is the same as that of the third sub-pixel 203 of the second pixel unit 200. For example, in a pixel unit group 10, the two red sub-pixels have the same aperture ratio, the two green sub-pixels have the same aperture ratio, and the two blue sub-pixels have the same aperture ratio.

[0069] It should be noted that the aperture ratio mentioned above can be the ratio of the sum of the areas of the effective light-emitting areas of each sub-pixel in the display panel to the area of ​​the display panel.

[0070] In some examples, the pixel unit group is configured to satisfy at least one of the following conditions: the aperture ratio of the first sub-pixel of the first pixel unit is different from the aperture ratio of the first sub-pixel of the second pixel unit; the aperture ratio of the second sub-pixel of the first pixel unit is different from the aperture ratio of the second sub-pixel of the second pixel unit; and the aperture ratio of the third sub-pixel of the first pixel unit is different from the aperture ratio of the third sub-pixel of the second pixel unit.

[0071] Referring to Figure 9, for example, the aperture ratio of the first sub-pixel 101 of the first pixel unit 100 is different from the aperture ratio of the first sub-pixel 201 of the second pixel unit 200. For example, the aperture ratio of the second sub-pixel 102 of the first pixel unit can be the same as or different from the aperture ratio of the second sub-pixel of the second pixel unit. For example, the aperture ratio of the third sub-pixel of the first pixel unit can be the same as or different from the aperture ratio of the third sub-pixel of the second pixel unit. For example, the aperture ratio of the second sub-pixel of the first pixel unit is the same as the aperture ratio of the second sub-pixel of the second pixel unit, and the aperture ratio of the third sub-pixel of the first pixel unit is the same as the aperture ratio of the third sub-pixel of the second pixel unit.

[0072] Referring to Figure 9, for example, first sub-pixels 101 and 201 are red sub-pixels. In a pixel unit group 10, the aperture ratio of the red sub-pixels of the first pixel unit 100 is different from that of the red sub-pixels of the second pixel unit 200. For example, the aperture ratio of the red sub-pixels of the first pixel unit 100 is greater than that of the red sub-pixels of the second pixel unit 200. For example, the ratio of the aperture ratio of the red sub-pixels of the first pixel unit 100 to that of the second pixel unit 200 is 6:4.

[0073] Referring to Figure 10, for example, the aperture ratio of the second sub-pixel 102 of the first pixel unit 100 is different from the aperture ratio of the second sub-pixel 202 of the second pixel unit 200. For example, the aperture ratio of the first sub-pixel of the first pixel unit and the aperture ratio of the first sub-pixel of the second pixel unit may be the same or different. For example, the aperture ratio of the third sub-pixel of the first pixel unit and the aperture ratio of the third sub-pixel of the second pixel unit may be the same or different. For example, the aperture ratio of the first sub-pixel of the first pixel unit is the same as the aperture ratio of the first sub-pixel of the second pixel unit, and the aperture ratio of the third sub-pixel of the first pixel unit is the same as the aperture ratio of the third sub-pixel of the second pixel unit.

[0074] Referring to Figure 10, for example, the second sub-pixels 102 and 202 are green sub-pixels. In a pixel unit group 10, the aperture ratio of the green sub-pixels of the first pixel unit 100 is different from that of the green sub-pixels of the second pixel unit 200. For example, the aperture ratio of the green sub-pixels of the first pixel unit 100 is smaller than that of the green sub-pixels of the second pixel unit 200. For example, the ratio of the aperture ratio of the green sub-pixels of the first pixel unit 100 to that of the second pixel unit 200 is 3:7.

[0075] Referring to Figure 11, for example, the aperture ratio of the third sub-pixel 103 of the first pixel unit 100 is different from the aperture ratio of the third sub-pixel 203 of the second pixel unit 200. For example, the aperture ratio of the first sub-pixel of the first pixel unit and the aperture ratio of the first sub-pixel of the second pixel unit may be the same or different. For example, the aperture ratio of the second sub-pixel of the first pixel unit and the aperture ratio of the second sub-pixel of the second pixel unit may be the same or different. For example, the aperture ratio of the first sub-pixel of the first pixel unit and the aperture ratio of the first sub-pixel of the second pixel unit are the same, and the aperture ratio of the second sub-pixel of the first pixel unit and the aperture ratio of the second sub-pixel of the second pixel unit are the same.

[0076] Referring to Figure 11, for example, third sub-pixels 103 and 203 are blue sub-pixels. In a pixel unit group 10, the aperture ratio of the blue sub-pixel of the first pixel unit 100 is different from the aperture ratio of the blue sub-pixel of the second pixel unit 200. For example, the aperture ratio of the blue sub-pixel of the first pixel unit 100 is greater than the aperture ratio of the blue sub-pixel of the second pixel unit 200. For example, the ratio of the aperture ratio of the blue sub-pixel of the first pixel unit 100 to the aperture ratio of the blue sub-pixel of the second pixel unit 200 is 8:2. For example, the ratio of the aperture ratio of the blue sub-pixel of the first pixel unit 100 to the aperture ratio of the blue sub-pixel of the second pixel unit 200 is 7:3.

[0077] Referring to Figure 12, for example, the aperture ratio of the first sub-pixel 101 of the first pixel unit 100 is different from the aperture ratio of the first sub-pixel 201 of the second pixel unit 200, and the aperture ratio of the second sub-pixel 102 of the first pixel unit 100 is different from the aperture ratio of the second sub-pixel 202 of the second pixel unit 200. That is, in a pixel unit group 10, the aperture ratios of the two red sub-pixels are different, and the aperture ratios of the two green sub-pixels are different. For example, the aperture ratios of the two blue sub-pixels are the same. For example, the ratio of the aperture ratio of the red sub-pixel of the first pixel unit 100 to the aperture ratio of the red sub-pixel of the second pixel unit 200 is 6:4, and the ratio of the aperture ratio of the green sub-pixel of the first pixel unit 100 to the aperture ratio of the green sub-pixel of the second pixel unit 200 is 3:7.

[0078] Referring to Figure 13, for example, the aperture ratio of the second sub-pixel 102 of the first pixel unit 100 is different from that of the second sub-pixel 202 of the second pixel unit 200, and the aperture ratio of the third sub-pixel 103 of the first pixel unit 100 is different from that of the third sub-pixel 203 of the second pixel unit 200. That is, in a pixel unit group 10, the aperture ratios of the two green sub-pixels are different, and the aperture ratios of the two blue sub-pixels are different. For example, the aperture ratios of the two red sub-pixels are the same. For example, the ratio of the aperture ratio of the blue sub-pixel of the first pixel unit 100 to the aperture ratio of the blue sub-pixel of the second pixel unit 200 is 7:3, and the ratio of the aperture ratio of the green sub-pixel of the first pixel unit 100 to the aperture ratio of the green sub-pixel of the second pixel unit 200 is 3:7.

[0079] For example, the aperture ratio of the first sub-pixel of the first pixel unit is different from that of the first sub-pixel of the second pixel unit, and the aperture ratio of the third sub-pixel of the first pixel unit is different from that of the third sub-pixel of the second pixel unit. That is, in a pixel unit group, the aperture ratios of the two red sub-pixels are different, and the aperture ratios of the two blue sub-pixels are different. For example, the aperture ratios of the two green sub-pixels are the same.

[0080] Referring to Figure 1, in some examples, each sub-pixel includes capping layers 1011, 1021, 1031, 2011, 2021, and 2031. For example, the material of the capping layer may include an organic material. The display panel includes a substrate 01, and a plurality of pixel unit groups 10 are disposed on the substrate 01. Taking sub-pixel 101 as an example, the second electrode 1211 is located on the side of the first electrode 1111 away from the substrate 01, and the capping layer 1011 is located on the side of the second electrode 1211 away from the first electrode 1111. When light emitted from the light-emitting layers (first light-emitting layer 1311 and second light-emitting layer 1411) is emitted outward through the second electrode 1211, a surface plasmon resonance effect exists near the interface between the second electrode 1211 and the dielectric. This effect leads to a decrease in the emitted light efficiency. The capping layer 1011 can suppress this negative effect, thereby helping to improve the luminous efficiency of the sub-pixel 101.

[0081] For example, each sub-pixel also includes film layers such as a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), an electron injection layer (EIL), and a charge generation layer (CGL) disposed between the first electrode and the second electrode.

[0082] The capping layer has a high refractive index. When the refractive index of the capping layer is greater than that of the electron transport layer, it can couple plasmons from the interface between the cathode and the contacting film layer into the capping layer, thereby suppressing this negative effect. For example, considering that the thickness of other film layers (such as the electron injection layer) between the electron transport layer and the cathode is very thin, the capping layer can couple plasmons from the interface between the cathode and the electron transport layer into the capping layer, ignoring other film layers.

[0083] For example, taking sub-pixel 101 as an example, a first electrode 1111 can be fabricated on a substrate 01. Then, a hole injection layer 1511, a hole transport layer 1611, a first light-emitting layer 1311, an electron transport layer 1711, an electron injection layer 1811, and a charge generation layer 1911 are sequentially deposited on the first electrode 1111. Next, a hole injection layer 1512, a hole transport layer 1612, a second light-emitting layer 1411, an electron transport layer 1712, and an electron injection layer 1812 are sequentially deposited on the charge generation layer 1911. Then, a second electrode 1211 is fabricated on the electron injection layer 1812. Finally, a capping layer 1011 is deposited on the second electrode 1211. For example, an encapsulation layer can be deposited on the capping layer 1011. The encapsulation layer can be a combination of multiple high-refractive-index and low-refractive-index films to enhance the resonance of light of a specific wavelength in the microcavity, thereby achieving selection and enhancement of light of a specific wavelength.

[0084] Referring to the aforementioned description of sub-pixel 101, the following structures can be formed: first electrodes 1121, 1131, 2111, 2121, 2131; hole injection layers 1521, 1531, 2511, 2521, 2531, 1522, 1532, 2512, 2522, 2532; hole transport layers 1621, 1631, 2611, 2621, 2631, 1622, 1632, 2612, 2622, 2632; first light-emitting layers 1321, 1331, 2311, 2321, 2331; second light-emitting layers 1421, 1431, 2411, 2421, 2431; and electron transport layers. Layers 1721, 1731, 2711, 2721, 2731, 1722, 1732, 2712, 2722, 2732, electron injection layers 1821, 1831, 2811, 2821, 2831, 1822, 1832, 2812, 2822, 2832, charge generation layers 1921, 1931, 2911, 2921, 2931, second electrodes 1221, 1231, 2211, 2221, 2231, capping layers 1021, 1031, 2011, 2011, 2021, 2031, to form sub-pixels 102, 103, 201, 202, 203.

[0085] It is understood that Figure 1 only schematically illustrates the relative positional relationships between the film layers in each sub-pixel, and does not limit the dimensions of each film layer, such as thickness. More or fewer film layers may be provided in each sub-pixel as needed, and this disclosure does not impose any limitations in this regard.

[0086] In some examples, the pixel unit group is configured to satisfy at least one of the following conditions: the thickness of the capping layer of the first sub-pixel of the first pixel unit is different from the thickness of the capping layer of the first sub-pixel of the second pixel unit; the thickness of the capping layer of the second sub-pixel of the first pixel unit is different from the thickness of the capping layer of the second sub-pixel of the second pixel unit; and the thickness of the capping layer of the third sub-pixel of the first pixel unit is different from the thickness of the capping layer of the third sub-pixel of the second pixel unit.

[0087] By adjusting the thickness of the capping layer for different sub-pixels, the sub-pixels in the microcavity can achieve optimal optical path length, thereby improving their optical performance. For example, the optimal optical path length of a sub-pixel can be determined based on its optical characteristics and the structural parameters of the microcavity.

[0088] Figure 14 is a schematic diagram of the capping layer of each sub-pixel of a display panel provided in at least one embodiment of the present disclosure. Figure 14 only schematically shows the capping layer corresponding to each sub-pixel. The thickness of each capping layer may be the same or different, as will be described in detail in the embodiments described later.

[0089] Referring to Figures 1 and 14, for example, the thickness d11 of the capping layer 1011 of the first sub-pixel 101 of the first pixel unit 100 is different from the thickness d21 of the capping layer 2011 of the first sub-pixel 201 of the second pixel unit 200. For example, the thickness of the capping layer of the second sub-pixel of the first pixel unit can be the same as or different from the thickness of the capping layer of the second sub-pixel of the second pixel unit. The thickness of the capping layer of the third sub-pixel of the first pixel unit can be the same as or different from the thickness of the capping layer of the third sub-pixel of the second pixel unit.

[0090] Referring to Figures 1 and 14, for example, the thickness d12 of the capping layer 1021 of the second sub-pixel 102 of the first pixel unit 100 is different from the thickness d22 of the capping layer 2021 of the second sub-pixel 202 of the second pixel unit 200. For example, the thickness of the capping layer of the first sub-pixel of the first pixel unit can be the same as or different from the thickness of the capping layer of the first sub-pixel of the second pixel unit. Similarly, the thickness of the capping layer of the third sub-pixel of the first pixel unit can be the same as or different from the thickness of the capping layer of the third sub-pixel of the second pixel unit.

[0091] Referring to Figures 1 and 14, for example, the thickness d13 of the capping layer 1031 of the third sub-pixel 103 of the first pixel unit 100 is different from the thickness d23 of the capping layer 2031 of the third sub-pixel 203 of the second pixel unit 200. For example, the thickness of the capping layer of the first sub-pixel of the first pixel unit can be the same as or different from the thickness of the capping layer of the first sub-pixel of the second pixel unit. Similarly, the thickness of the capping layer of the second sub-pixel of the first pixel unit can be the same as or different from the thickness of the capping layer of the second sub-pixel of the second pixel unit.

[0092] For example, the capping layer thickness of each sub-pixel in the first pixel unit is different. For example, the capping layer thickness of each sub-pixel in the second pixel unit can be the same or different.

[0093] In some examples, each sub-pixel also includes a hole transport layer located between the first electrode and the second electrode. Referring to Figure 1, for example, hole transport layers 1611, 1621, 1631, 2611, 2621, 2631 are respectively located between the first electrodes 1111, 1121, 1131, 2111, 2121, 2131 and the first light-emitting layers 1311, 1321, 1331, 2311, 2321, 2331, and the hole transport layers 1612, 1622, 1632, 2612, 2622, 2632 are respectively located between the first light-emitting layers 1311, 1321, 1331, 2311, 2321, 2331 and the second light-emitting layers 1411, 1421, 1431, 2411, 2421, 2431.

[0094] The hole transport layer in the first pixel unit is configured such that the first emitting layer of the sub-pixel in the first pixel unit is located at the second inverse node of the standing wave and the second emitting layer is located at the third inverse node of the standing wave, and the hole transport layer in the second pixel unit is configured such that the first emitting layer of at least one sub-pixel of the second pixel unit is located at the first inverse node of the standing wave and the second emitting layer is located at the second inverse node of the standing wave.

[0095] For example, the positions of the first and second emissive layers of each sub-pixel in the first pixel unit can be adjusted by changing the thickness of the hole transport layer in the first pixel unit. For example, the thickness of the hole transport layer in each sub-pixel of the first pixel unit can be the same or different. Similarly, the positions of the first and second emissive layers of each sub-pixel in the second pixel unit can be adjusted by changing the thickness of the hole transport layer in the second pixel unit. For example, the thickness of the hole transport layer in each sub-pixel of the second pixel unit can be the same or different.

[0096] In some examples, the pixel unit group is configured to satisfy at least one of the following conditions: the thickness of the hole transport layer of the first sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the first sub-pixel of the second pixel unit; the thickness of the hole transport layer of the second sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the second sub-pixel of the second pixel unit; and the thickness of the hole transport layer of the third sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the third sub-pixel of the second pixel unit.

[0097] Figure 15 is a schematic diagram of the hole transport layer of each sub-pixel of a display panel provided in at least one embodiment of the present disclosure. Figure 15 only schematically shows the hole transport layers 1611, 1621, 1631, 2611, 2621, 2631 located between the first electrodes 1111, 1121, 1131, 2111, 2121, 2131 and the first light-emitting layers 1311, 1321, 1331, 2311, 2321, 2331 corresponding to each sub-pixel 101, 102, 103, 201, 202, 203 and the first light-emitting layers 1311, 1321, 1331, 2311, 2321, 2331. The thickness of each capping layer 1611, 1621, 1631, 2611, 2621, 2631 may be the same or different, as will be described in detail in the embodiments described later.

[0098] This disclosure uses the thickness design of hole transport layers 1611, 1621, 1631, 2611, 2621, and 2631 as an example for illustration. It is understood that the thickness design of hole transport layers 1612, 1622, 1632, 2612, 2622, and 2632 can refer to the thickness design of hole transport layers 1611, 1621, 1631, 2611, 2621, and 2631, and will not be elaborated upon here.

[0099] Referring to Figures 1 and 15, for example, the thickness d14 of the hole transport layer 1611 of the first sub-pixel 101 of the first pixel unit 100 is different from the thickness d24 of the hole transport layer 2611 of the first sub-pixel 201 of the second pixel unit 200. For example, the thickness of the hole transport layer of the second sub-pixel of the first pixel unit can be the same as or different from the thickness of the hole transport layer of the second sub-pixel of the second pixel unit. For example, the thickness of the hole transport layer of the third sub-pixel of the first pixel unit can be the same as or different from the thickness of the hole transport layer of the third sub-pixel of the second pixel unit.

[0100] Referring to Figures 1 and 15, for example, the thickness d15 of the hole transport layer 1621 of the second sub-pixel 102 of the first pixel unit 100 is different from the thickness d25 of the hole transport layer 2621 of the second sub-pixel 202 of the second pixel unit 200. For example, the thickness of the hole transport layer of the first sub-pixel of the first pixel unit can be the same as or different from the thickness of the hole transport layer of the first sub-pixel of the second pixel unit. For example, the thickness of the hole transport layer of the third sub-pixel of the first pixel unit can be the same as or different from the thickness of the hole transport layer of the third sub-pixel of the second pixel unit.

[0101] Referring to Figures 1 and 15, for example, the thickness d16 of the hole transport layer 1631 of the third sub-pixel 103 of the first pixel unit 100 is different from the thickness d26 of the hole transport layer 2631 of the third sub-pixel 203 of the second pixel unit 200. For example, the thickness of the hole transport layer of the first sub-pixel of the first pixel unit can be the same as or different from the thickness of the hole transport layer of the first sub-pixel of the second pixel unit. For example, the thickness of the hole transport layer of the second sub-pixel of the first pixel unit can be the same as or different from the thickness of the hole transport layer of the second sub-pixel of the second pixel unit.

[0102] The inventors of this disclosure conducted simulation experiments. Below, the display panel in the aforementioned embodiments will be described in conjunction with comparative examples and Examples 1 to 10.

[0103] In the comparative examples and various embodiments, the anode was always ITO / Ag / ITO, and the cathode was always MgAg. The distance between the second light-emitting layer and the cathode in the direction perpendicular to the substrate was less than 500 Å.

[0104] In the comparative example, in the first and second pixel units, with Ag in the anode serving as the reflective surface, the first luminescent layers of sub-pixels R, G, and B are all located at the second inverse node, and the second luminescent layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. The luminous efficiency of white, red, green, and blue light in the comparative example is 100%.

[0105] In the comparative examples, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.965145 when the field of view is 15 degrees, 0.672923 when the field of view is 30 degrees, 0.25645 when the field of view is 45 degrees, and 0.106707 when the field of view is 60 degrees.

[0106] In Example 1, in the first pixel unit, with Ag in the anode as the reflective surface, the first emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first emitting layers of sub-pixels R, G, and B are all located at the first inverse node, and the second emitting layers of sub-pixels R, G, and B are all located at the second inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 83 nm, 95 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratios of sub-pixels R, G, and B are consistent. The white light luminous efficiency in Example 1 is 100.5%, the red light luminous efficiency is 101.7%, the green light luminous efficiency is 101.6%, and the blue light luminous efficiency is 97.9%.

[0107] In Example 1, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.968799 when the field of view is 15 degrees, 0.722513 when the field of view is 30 degrees, 0.34897 when the field of view is 45 degrees, and 0.173291 when the field of view is 60 degrees.

[0108] In Example 2, in the first pixel unit, with Ag in the anode as the reflective surface, the first emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first emitting layers of sub-pixels R and G are all located at the first inverse node, and the second emitting layers of sub-pixels R and G are all located at the second inverse node. The first emitting layer of sub-pixel B is located at the second inverse node, and the second emitting layer is located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 83 nm, 95 nm, and 116 nm, respectively. In both the first and second pixel units, the aperture ratio of sub-pixels R and G remains consistent. The ratio of the aperture ratio of sub-pixels B in the first pixel unit to that in the second pixel unit is 8:2. In Example 2, the luminous efficiency of white light was 97.7%, the luminous efficiency of red light was 101.7%, the luminous efficiency of green light was 92.1%, and the luminous efficiency of blue light was 97.9%.

[0109] In Example 2, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.984548 when the field of view is 15 degrees, 0.78064 when the field of view is 30 degrees, 0.377324 when the field of view is 45 degrees, and 0.171112 when the field of view is 60 degrees.

[0110] In Example 3, in the first pixel unit, with Ag in the anode as the reflective surface, the first emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first emitting layers of sub-pixels R and B are all located at the first inverse node, and the second emitting layers of sub-pixels R and B are all located at the second inverse node. The first emitting layer of sub-pixel G is located at the second inverse node, and the second emitting layer is located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 83 nm, 83 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratio of sub-pixels R and B is consistent, and the ratio of the aperture ratio of sub-pixels G in the first pixel unit to that in the second pixel unit is 3:7. In Example 3, the luminous efficiency of white light was 96.8%, that of red light was 101.7%, that of green light was 101.6%, and that of blue light was 90.3%.

[0111] In Example 3, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.968656 when the field of view is 15 degrees, 0.722661 when the field of view is 30 degrees, 0.348708 when the field of view is 45 degrees, and 0.173288 when the field of view is 60 degrees.

[0112] In Example 4, in the first pixel unit, with Ag in the anode as the reflective surface, the first emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first emitting layers of sub-pixels G and B are all located at the first inverse node, and the second emitting layers of sub-pixels G and B are all located at the second inverse node. The first emitting layer of sub-pixel R is located at the second inverse node, and the second emitting layer is located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 75 nm, 95 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratios of sub-pixels R, G, and B are consistent. The white light luminous efficiency in Example 4 is 96.9%, the red light luminous efficiency is 87.8%, the green light luminous efficiency is 101.6%, and the blue light luminous efficiency is 97.9%.

[0113] In Example 4, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.968643 when the field of view is 15 degrees, 0.733979 when the field of view is 30 degrees, 0.352696 when the field of view is 45 degrees, and 0.165353 when the field of view is 60 degrees.

[0114] In Example 5, in the first pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the first inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 83 nm, 95 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratio of sub-pixel G and sub-pixel B are consistent. The ratio of the aperture ratio of sub-pixel R in the first pixel unit to that in the second pixel unit is 6:4. In Example 5, the luminous efficacy of white light was 101.4%, that of red light was 105.6%, that of green light was 101.6%, and that of blue light was 97.9%.

[0115] In Example 5, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.96808 when the field of view is 15 degrees, 0.715016 when the field of view is 30 degrees, 0.339211 when the field of view is 45 degrees, and 0.166816 when the field of view is 60 degrees.

[0116] In Example 6, in the first pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels G and B are all located at the first inverse node, and the second light-emitting layers of sub-pixels G and B are all located at the second inverse node. The first light-emitting layer of sub-pixel R is located at the second inverse node, and the second light-emitting layer is located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 75 nm, 95 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratio of sub-pixel G and sub-pixel B are consistent. The ratio of the aperture ratio of sub-pixel R in the first pixel unit to that in the second pixel unit is 6:4. In Example 6, the luminous efficiency of white light was 100.2%, the luminous efficiency of red light was 100.0%, the luminous efficiency of green light was 101.6%, and the luminous efficiency of blue light was 97.9%.

[0117] In Example 6, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.972046 when the field of view is 15 degrees, 0.721963 when the field of view is 30 degrees, 0.334323 when the field of view is 45 degrees, and 0.156559 when the field of view is 60 degrees.

[0118] In Example 7, in the first pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the first inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 83 nm, 95 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratio of sub-pixels R and B is consistent, and the ratio of the aperture ratio of sub-pixels G in the first pixel unit to that in the second pixel unit is 3:7. In Example 7, the luminous efficiency of white light was 100.8%, that of red light was 101.7%, that of green light was 103.2%, and that of blue light was 97.9%.

[0119] In Example 7, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.959361 when the field of view is 15 degrees, 0.694866 when the field of view is 30 degrees, 0.331964 when the field of view is 45 degrees, and 0.170266 when the field of view is 60 degrees.

[0120] In Example 8, in the first pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the first inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 83 nm, 95 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratio of sub-pixels R and G is consistent, and the ratio of the aperture ratio of sub-pixels B in the first pixel unit to that in the second pixel unit is 7:3. In Example 8, the luminous efficacy of white light was 101.5%, the luminous efficacy of red light was 101.7%, the luminous efficacy of green light was 101.6%, and the luminous efficacy of blue light was 100.0%.

[0121] In Example 8, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.968381 when the field of view is 15 degrees, 0.721432 when the field of view is 30 degrees, 0.348087 when the field of view is 45 degrees, and 0.173129 when the field of view is 60 degrees.

[0122] In Example 9, in the first pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the first inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 83 nm, 95 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratio of sub-pixel R is consistent. The ratio of the aperture ratio of sub-pixel G in the first pixel unit to that in the second pixel unit is 3:7, and the ratio of the aperture ratio of sub-pixel B in the first pixel unit to that in the second pixel unit is 7:3. In Example 8, the luminous efficacy of white light was 101.8%, the luminous efficacy of red light was 101.7%, the luminous efficacy of green light was 103.2%, and the luminous efficacy of blue light was 100.0%.

[0123] In Example 9, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.958914566 when the field of view is 15 degrees, 0.693699864 when the field of view is 30 degrees, 0.331030476 when the field of view is 45 degrees, and 0.170093956 when the field of view is 60 degrees.

[0124] In Example 10, in the first pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the third inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 91 nm, 95 nm, and 83 nm, respectively. In the second pixel unit, with Ag in the anode as the reflective surface, the first light-emitting layers of sub-pixels R, G, and B are all located at the first inverse node, and the second light-emitting layers of sub-pixels R, G, and B are all located at the second inverse node. The capping layer thicknesses of sub-pixels R, G, and B are 83 nm, 95 nm, and 83 nm, respectively. In both the first and second pixel units, the aperture ratio of sub-pixel B is consistent. The ratio of the aperture ratio of sub-pixel R in the first pixel unit to that in the second pixel unit is 6:4, and the ratio of the aperture ratio of sub-pixel G in the first pixel unit to that in the second pixel unit is 3:7. In Example 8, the luminous efficacy of white light was 101.7%, that of red light was 105.6%, that of green light was 103.2%, and that of blue light was 97.9%.

[0125] In Example 10, the brightness attenuation ratio is 1 when the field of view is 0 degrees, 0.958620469 when the field of view is 15 degrees, 0.687141572 when the field of view is 30 degrees, 0.321909401 when the field of view is 45 degrees, and 0.163594001 when the field of view is 60 degrees.

[0126] Based on the descriptions of the comparative examples and Examples 1 to 10 above, it can be seen that, compared to the comparative examples, at large viewing angles, such as viewing angles greater than 30 degrees, the luminance attenuation ratios of Examples 1 to 10 are all higher than those of the comparative examples. Therefore, it is evident that the display panels provided by Examples 1 to 10 can achieve significant improvements in luminance attenuation over a wider viewing range. Furthermore, based on the experimental data from the comparative examples and Examples 1 to 10 above, it can be seen that Examples 8 and 9 can both achieve high luminous efficiency.

[0127] This disclosure provides a display device including the display panel described in the above embodiments. Since the display device according to this disclosure uses the aforementioned display panel, it also possesses corresponding beneficial technical effects, which will not be elaborated upon here.

[0128] For example, the display device can be an organic light-emitting diode (OLED) display device or other display device, as well as any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator that includes the display device. This embodiment is not limited to this.

[0129] The following points need to be explained:

[0130] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.

[0131] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure may be combined with each other.

[0132] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.

Claims

1. A display panel, comprising: Multiple pixel unit groups, each pixel unit group including an adjacent first pixel unit and a second pixel unit; The first pixel unit and the second pixel unit each include a plurality of sub-pixels, and each sub-pixel includes a first electrode, a first light-emitting layer, a second light-emitting layer and a second electrode stacked in sequence; the colored light emitted by the sub-pixel forms a standing wave within the sub-pixel; Here, with the plane facing the first electrode toward the first light-emitting layer as the reference plane, the standing wave includes a first inverse node, a second inverse node, and a third inverse node formed sequentially along the reference plane. The first light-emitting layer of the sub-pixel in the first pixel unit is located at the second inverse node of the standing wave and the second light-emitting layer is located at the third inverse node of the standing wave; The first light-emitting layer of at least one sub-pixel of the second pixel unit is located at the first inverse node of the standing wave, and the second light-emitting layer is located at the second inverse node of the standing wave.

2. The display panel according to claim 1, wherein, The first light-emitting layer of all sub-pixels of the second pixel unit is located at the first inverse node of the standing wave, and the second light-emitting layer of all sub-pixels of the second pixel unit is located at the second inverse node of the standing wave.

3. The display panel according to claim 2, wherein, The first pixel unit and the second pixel unit each include a first sub-pixel, a second sub-pixel and a third sub-pixel; the first sub-pixel emits a first color light, the second sub-pixel emits a second color light, and the third sub-pixel emits a third color light, wherein the wavelength of the second color light is less than the wavelength of the first color light and greater than the wavelength of the third color light; The aperture ratio of the first sub-pixel of the first pixel unit is the same as that of the first sub-pixel of the second pixel unit; The aperture ratio of the second sub-pixel of the first pixel unit is the same as that of the second sub-pixel of the second pixel unit; The aperture ratio of the third sub-pixel of the first pixel unit is the same as that of the third sub-pixel of the second pixel unit.

4. The display panel according to claim 2, wherein, The first pixel unit and the second pixel unit respectively include a first sub-pixel, a second sub-pixel and a third sub-pixel; the first sub-pixel emits a first color light, the second sub-pixel emits a second color light, and the third sub-pixel emits a third color light, wherein the wavelength of the second color light is less than the wavelength of the first color light and greater than the wavelength of the third color light; The pixel unit group is configured to satisfy at least one of the following conditions: The aperture ratio of the first sub-pixel of the first pixel unit is different from that of the first sub-pixel of the second pixel unit; The aperture ratio of the second sub-pixel of the first pixel unit is different from that of the second sub-pixel of the second pixel unit; The aperture ratio of the third sub-pixel of the first pixel unit is different from that of the third sub-pixel of the second pixel unit.

5. The display panel according to claim 1, wherein, The first pixel unit and the second pixel unit respectively include a first sub-pixel, a second sub-pixel and a third sub-pixel; wherein, the first sub-pixel emits a first color light, and the first color light forms a first standing wave in the first sub-pixel; the second sub-pixel emits a second color light, and the second color light forms a second standing wave in the second sub-pixel; the third sub-pixel emits a third color light, and the third color light forms a third standing wave in the third sub-pixel. The wavelength of the second color light is shorter than the wavelength of the first color light but longer than the wavelength of the third color light.

6. The display panel according to claim 5, wherein, The first light-emitting layer of the first sub-pixel of the second pixel unit is located at the second inverse node of the first standing wave, and the second light-emitting layer of the first sub-pixel of the second pixel unit is located at the third inverse node of the first standing wave; The first light-emitting layer of the second sub-pixel of the second pixel unit is located at the first inverse node of the second standing wave, and the second light-emitting layer of the second sub-pixel of the second pixel unit is located at the second inverse node of the second standing wave; The first light-emitting layer of the third sub-pixel of the second pixel unit is located at the first inverse node of the third standing wave, and the second light-emitting layer of the third sub-pixel of the second pixel unit is located at the second inverse node of the third standing wave.

7. The display panel according to claim 6, wherein, The aperture ratio of the first sub-pixel of the first pixel unit is the same as that of the first sub-pixel of the second pixel unit; The aperture ratio of the second sub-pixel of the first pixel unit is the same as that of the second sub-pixel of the second pixel unit; The aperture ratio of the third sub-pixel of the first pixel unit is the same as that of the third sub-pixel of the second pixel unit.

8. The display panel according to claim 6, wherein, The aperture ratio of the first sub-pixel of the first pixel unit is different from that of the first sub-pixel of the second pixel unit; The aperture ratio of the second sub-pixel of the first pixel unit is the same as that of the second sub-pixel of the second pixel unit; The aperture ratio of the third sub-pixel of the first pixel unit is the same as that of the third sub-pixel of the second pixel unit.

9. The display panel according to claim 5, wherein, The first light-emitting layer of the first sub-pixel of the second pixel unit is located at the first inverse node of the first standing wave, and the second light-emitting layer of the first sub-pixel of the second pixel unit is located at the second inverse node of the first standing wave; The first light-emitting layer of the second sub-pixel of the second pixel unit is located at the first inverse node of the second standing wave, and the second light-emitting layer of the second sub-pixel of the second pixel unit is located at the second inverse node of the second standing wave; The first light-emitting layer of the third sub-pixel of the second pixel unit is located at the second inverse node of the third standing wave, and the second light-emitting layer of the third sub-pixel of the second pixel unit is located at the third inverse node of the third standing wave.

10. The display panel according to claim 9, wherein, The aperture ratio of the first sub-pixel of the first pixel unit is the same as that of the first sub-pixel of the second pixel unit; The aperture ratio of the second sub-pixel of the first pixel unit is the same as that of the second sub-pixel of the second pixel unit; The aperture ratio of the third sub-pixel of the first pixel unit is different from that of the third sub-pixel of the second pixel unit.

11. The display panel according to claim 5, wherein, The first light-emitting layer of the first sub-pixel of the second pixel unit is located at the first inverse node of the first standing wave, and the second light-emitting layer of the first sub-pixel of the second pixel unit is located at the second inverse node of the first standing wave; The first light-emitting layer of the second sub-pixel of the second pixel unit is located at the second inverse node of the second standing wave, and the second light-emitting layer of the second sub-pixel of the second pixel unit is located at the third inverse node of the second standing wave; The first light-emitting layer of the third sub-pixel of the second pixel unit is located at the first inverse node of the third standing wave, and the second light-emitting layer of the third sub-pixel of the second pixel unit is located at the second inverse node of the third standing wave.

12. The display panel according to claim 11, wherein, The aperture ratio of the first sub-pixel of the first pixel unit is the same as that of the first sub-pixel of the second pixel unit; The aperture ratio of the second sub-pixel of the first pixel unit is different from that of the second sub-pixel of the second pixel unit; The aperture ratio of the third sub-pixel of the first pixel unit is the same as that of the third sub-pixel of the second pixel unit.

13. The display panel according to any one of claims 5-12, wherein, Each of the sub-pixels includes a capping layer; the display panel includes a substrate, and the plurality of pixel units are disposed on the substrate; the second electrode is located on the side of the first electrode away from the substrate, and the capping layer is located on the side of the second electrode away from the first electrode; The pixel unit group is configured to satisfy at least one of the following conditions: The thickness of the capping layer of the first sub-pixel of the first pixel unit is different from the thickness of the capping layer of the first sub-pixel of the second pixel unit; The thickness of the capping layer of the second sub-pixel of the first pixel unit is different from the thickness of the capping layer of the second sub-pixel of the second pixel unit; The thickness of the capping layer of the third sub-pixel of the first pixel unit is different from the thickness of the capping layer of the third sub-pixel of the second pixel unit.

14. The display panel according to any one of claims 1-13, wherein, Each of the sub-pixels further includes a hole transport layer located between the first electrode and the second electrode; the hole transport layer in the first pixel unit is configured such that the first light-emitting layer of the sub-pixel in the first pixel unit is located at the second inverse node of the standing wave and the second light-emitting layer is located at the third inverse node of the standing wave, and the hole transport layer in the second pixel unit is configured such that the first light-emitting layer of at least one sub-pixel of the second pixel unit is located at the first inverse node of the standing wave and the second light-emitting layer is located at the second inverse node of the standing wave; The pixel unit group is configured to satisfy at least one of the following conditions: The thickness of the hole transport layer of the first sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the first sub-pixel of the second pixel unit; The thickness of the hole transport layer of the second sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the second sub-pixel of the second pixel unit; The thickness of the hole transport layer of the third sub-pixel of the first pixel unit is different from the thickness of the hole transport layer of the third sub-pixel of the second pixel unit.

15. A display device comprising the display panel according to any one of claims 1-14.

Images