Display panel and manufacturing method and driving method therefor, and display device

Abstract

The present application belongs to the technical field of display. Disclosed is a display panel. The display panel comprises a first substrate, a second substrate, a plurality of pixel units located between the first substrate and the second substrate, a first driving circuit, and a second driving circuit. Each pixel unit comprises a plurality of sub-pixel units. In a direction from the first substrate to the second substrate, each sub-pixel unit comprises at least a first light-emitting unit and a second light-emitting unit, and in at least one sub-pixel unit, the first light-emitting unit comprises a first electrode, a first light-emitting layer and a second electrode, and the second light-emitting unit comprises a third electrode, a second light-emitting layer and a fourth electrode. The fourth electrode is a reflective electrode, one of the first electrode, the second electrode and the third electrode is a transflective electrode, and a resonant cavity is formed between the reflective electrode and the transflective electrode. The first light-emitting unit is electrically connected to the first driving circuit, and the second light-emitting unit is electrically connected to the second driving circuit. The present application can reduce the power consumption when at least some sub-pixel units are lit up.

Description

Display panel and its manufacturing method, driving method, display device Technical Field

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

[0002] Display devices have a wide range of applications in daily life, such as mobile phones, tablets, and other electronic devices. The display panel is an important component of display devices.

[0003] In related technologies, a display panel includes a substrate and multiple pixel units located on the substrate. Each pixel unit includes multiple sub-pixel units, and each sub-pixel unit includes a stacked first electrode, multiple light-emitting layers, and a second electrode. The light emitted by the multiple light-emitting layers is of different colors.

[0004] However, lighting up any single monochrome subpixel unit, such as a red subpixel unit, a green subpixel unit, or a blue subpixel unit, requires multiple light-emitting layers to emit light simultaneously, which results in a large power consumption of the display panel.

[0005] Summary of the Invention

[0006] This application provides a display panel, its manufacturing method, driving method, and display device, which can reduce power consumption when at least some sub-pixel units are lit. The technical solution is as follows:

[0007] On one hand, a display panel is provided, the display panel including a first substrate, a second substrate, a plurality of pixel units located between the first substrate and the second substrate, and a first driving circuit and a second driving circuit, wherein the first substrate is a transparent substrate; the pixel unit includes a plurality of sub-pixel units, the sub-pixel unit including at least a first light-emitting unit and a second light-emitting unit stacked in a first direction, the first direction being the direction from the first substrate to the second substrate; the first light-emitting unit is electrically connected to the first driving circuit, the second light-emitting unit is electrically connected to the second driving circuit, the first driving circuit is located on the side of the first light-emitting unit away from the second light-emitting unit, and the second driving circuit is located on the side of the second light-emitting unit away from the first light-emitting unit; in at least one of the sub-pixel units, in the first direction, the first light-emitting unit includes a first electrode, a first light-emitting layer and a second electrode stacked sequentially, the second light-emitting unit includes a third electrode, a second light-emitting layer and a fourth electrode stacked sequentially, wherein the fourth electrode is a reflective electrode, one of the first electrode, the second electrode and the third electrode is a semi-transparent and semi-reflective electrode, and a resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode.

[0008] Optionally, in at least one of the sub-pixel units, the third electrode is the semi-transparent and semi-reflective electrode.

[0009] Optionally, within the sub-pixel unit, one of the first light-emitting unit and the second light-emitting unit is a blue light-emitting unit, and the other light-emitting unit is a yellow light-emitting unit; the pixel unit includes a red sub-pixel unit, a green sub-pixel unit, and a first blue sub-pixel unit; the display panel further includes a color filter layer, the color filter layer being located on the side of the first light-emitting unit away from the second light-emitting unit; the color filter layer includes a red color resist block, a green color resist block, and a first cut-out area; the orthographic projection of the red color resist block on the second substrate at least partially coincides with the orthographic projection of the red sub-pixel unit on the second substrate; the orthographic projection of the green color resist block on the second substrate at least partially coincides with the orthographic projection of the green sub-pixel unit on the second substrate; and the orthographic projection of the first cut-out area on the second substrate at least partially coincides with the orthographic projection of the first blue sub-pixel unit on the second substrate.

[0010] Optionally, within the sub-pixel unit, the second light-emitting unit is the blue light-emitting unit, and the second electrode or the third electrode is the semi-transparent and semi-reflective electrode.

[0011] Optionally, the pixel unit further includes a white sub-pixel unit, in which one of the first electrode, the second electrode, and the third electrode is the semi-transparent and semi-reflective electrode.

[0012] Optionally, the light-emitting layer of the yellow light-emitting unit includes a stacked red light-emitting layer and a yellow light-emitting layer.

[0013] Optionally, the light-emitting layer of the yellow light-emitting unit comprises a mixture of red and yellow light-emitting materials.

[0014] Optionally, the blue light-emitting unit includes two stacked blue light-emitting layers and a charge-generating layer located between the two stacked blue light-emitting layers.

[0015] Optionally, the pixel unit further includes a second blue sub-pixel unit, and the color filter layer further includes a second cutout region, wherein the orthographic projection of the second cutout region on the second substrate at least partially overlaps with the orthographic projection of the second blue sub-pixel unit on the second substrate.

[0016] Optionally, within the sub-pixel unit, one of the first light-emitting unit and the second light-emitting unit is a blue light-emitting unit, and the light-emitting layer of the other light-emitting unit includes a stacked red light-emitting layer and a green light-emitting layer; the pixel unit includes a red sub-pixel unit, a green sub-pixel unit, and a first blue sub-pixel unit; the display panel further includes a color filter layer, the color filter layer being located on the side of the first light-emitting unit away from the second light-emitting unit; the color filter layer includes a red color resist block, a green color resist block, and a first cut-out area; the orthographic projection of the red color resist block on the second substrate at least partially coincides with the orthographic projection of the red sub-pixel unit on the second substrate; the orthographic projection of the green color resist block on the second substrate at least partially coincides with the orthographic projection of the green sub-pixel unit on the second substrate; and the orthographic projection of the first cut-out area on the second substrate at least partially coincides with the orthographic projection of the first blue sub-pixel unit on the second substrate.

[0017] Optionally, the display panel further includes a first pixel definition layer and a second pixel definition layer; the first pixel definition layer is located on the side of the first substrate near the first light-emitting unit, and the first pixel definition layer includes a plurality of first sub-pixel openings, the orthographic projection of the plurality of first sub-pixel openings on the second substrate at least partially coincides with the orthographic projection of the plurality of sub-pixel units on the second substrate; the second pixel definition layer is located on the side of the second substrate near the second light-emitting unit, and the second pixel definition layer includes a plurality of second sub-pixel openings, the orthographic projection of the plurality of second sub-pixel openings on the second substrate at least partially coincides with the orthographic projection of the plurality of sub-pixel units on the second substrate, and the plurality of first sub-pixel openings are opposite to the plurality of second sub-pixel openings.

[0018] Optionally, the display panel further includes a first driving circuit layer and a second driving circuit layer. The first driving circuit layer is located on the side of the first substrate near the first light-emitting unit, and the first driving circuit is located within the first driving circuit layer. The second driving circuit layer is located on the side of the second substrate near the second light-emitting unit, and the second driving circuit is located within the second driving circuit layer. At least a portion of the orthographic projection of the first driving circuit on the second substrate is located within the orthographic projection of the first sub-pixel definition layer on the second substrate.

[0019] Optionally, the display panel further includes a filling structure located between the first light-emitting unit and the second light-emitting unit, and connected to the first light-emitting unit and the second light-emitting unit.

[0020] Optionally, the sub-pixel unit further includes a third light-emitting unit, a third substrate, and a third driving circuit located between the first light-emitting unit and the second light-emitting unit. The light emitted by the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are of different colors. The third light-emitting unit is connected to the third driving circuit. In the first direction, the third light-emitting unit includes a fifth electrode, a third light-emitting layer, and a sixth electrode stacked sequentially.

[0021] Optionally, the plurality of sub-pixel units include a first target sub-pixel unit and a second target sub-pixel unit with different emission colors; in the first direction, the semi-transparent and semi-reflective electrode in the first target sub-pixel unit is located on one side of the semi-transparent and semi-reflective electrode in the second target sub-pixel unit.

[0022] Optionally, the plurality of sub-pixel units include a first target sub-pixel unit and a second target sub-pixel unit with different emission colors; the semi-transparent and semi-reflective electrode in the first target sub-pixel unit is in the same layer as the semi-transparent and semi-reflective electrode in the second target sub-pixel unit.

[0023] On the other hand, a method for manufacturing a display panel is also provided, the method comprising: providing a first substrate and a second substrate; fabricating a first light-emitting unit on the first substrate, fabricating a second light-emitting unit on the second substrate, and connecting the first substrate and the second substrate relative to each other to obtain a display panel; wherein the first substrate is a transparent substrate, the display panel includes a plurality of pixel units located between the first substrate and the second substrate, and a first driving circuit and a second driving circuit, the pixel unit including a plurality of sub-pixel units, the sub-pixel unit including at least the first light-emitting unit and the second light-emitting unit stacked in a first direction, the first direction being the direction from the first substrate to the second substrate; the first light-emitting unit... The first light-emitting unit is electrically connected to the first driving circuit, and the second light-emitting unit is electrically connected to the second driving circuit. The first driving circuit is located on the side of the first light-emitting unit away from the second light-emitting unit, and the second driving circuit is located on the side of the second light-emitting unit away from the first light-emitting unit. In at least one of the sub-pixel units, in the first direction, the first light-emitting unit includes a first electrode, a first light-emitting layer, and a second electrode stacked in sequence, and the second light-emitting unit includes a third electrode, a second light-emitting layer, and a fourth electrode stacked in sequence. The fourth electrode is a reflective electrode, and one of the first electrode, the second electrode, and the third electrode is a semi-transparent and semi-reflective electrode. A resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode.

[0024] Furthermore, a driving method for a display panel is also provided. This driving method controls the display panel, which includes a first substrate, a second substrate, and a plurality of pixel units located between the first substrate and the second substrate. The first substrate is a transparent substrate. Each pixel unit includes a plurality of sub-pixel units, and each sub-pixel unit includes a plurality of light-emitting units stacked in a first direction, where the first direction is the direction from the first substrate to the second substrate. The plurality of light-emitting units includes first and second light-emitting units stacked in the first direction. The display panel also includes a first driving circuit and a second driving circuit. The first and second light-emitting units are respectively connected to the first driving circuit and the second driving circuit and emit light of different colors. The circuit is located on the side of the first light-emitting unit away from the second light-emitting unit, and the second driving circuit is located on the side of the second light-emitting unit away from the first light-emitting unit; in at least one of the sub-pixel units, in the first direction, the first light-emitting unit includes a first electrode, a first light-emitting layer and a second electrode stacked sequentially, and the second light-emitting unit includes a third electrode, a second light-emitting layer and a fourth electrode stacked sequentially, wherein the fourth electrode is a reflective electrode, and one of the first electrode, the second electrode and the third electrode is a semi-transparent and semi-reflective electrode, and a resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode; the method includes: acquiring a control command; and driving at least one of the first light-emitting unit and the second light-emitting unit of the sub-pixel unit to emit light based on the control command.

[0025] Optionally, one of the first and second light-emitting units is a blue light-emitting unit, and the other is a yellow light-emitting unit. The pixel unit includes a red sub-pixel unit, a green sub-pixel unit, a first blue sub-pixel unit, and a white sub-pixel unit. The driving method includes: acquiring a control command; when the control command is a first control command, applying a first current signal to the blue light-emitting unit of the white sub-pixel unit and applying a second current signal to the yellow light-emitting unit of the white sub-pixel unit, so that the white sub-pixel unit emits a first color light; when the control command is a second control command, applying a third current signal to the blue light-emitting unit of the white sub-pixel unit and applying a fourth current signal to the yellow light-emitting unit of the white sub-pixel unit, so that the white sub-pixel unit emits a second color light; wherein, the first current signal is less than the third current signal, the second current signal is greater than the fourth current signal, and the color temperature of the first color light is lower than the color temperature of the second color light.

[0026] In another aspect, a display device is also provided, the display device including a power supply circuit and any of the aforementioned display panels, wherein the power supply circuit supplies power to the display panel.

[0027] The beneficial effects of the technical solution provided in this application include at least the following: by setting a first light-emitting unit and a second light-emitting unit stacked in a first direction and independently controllable in a sub-pixel unit, only a portion of the light-emitting units can be lit in a sub-pixel unit, reducing the power consumption of a single sub-pixel unit. Furthermore, the fourth electrode in the first and second light-emitting units is a reflective electrode, and one of the first, second, and third electrodes is a semi-transparent, semi-reflective electrode. A resonant cavity is formed between the reflective electrode and the semi-transparent, semi-reflective electrode, thereby improving the luminous efficiency of the light-emitting layer located between the reflective electrode and the semi-transparent, semi-reflective electrode under the effect of the microcavity effect. Therefore, the power consumption when at least a portion of the sub-pixel units are lit can be reduced without changing the brightness of the sub-pixel unit. Attached Figure Description

[0028] 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.

[0029] Figure 1 is a schematic cross-sectional view of a display panel provided in an embodiment of this application;

[0030] Figure 2 is a schematic diagram of the planar structure of a display panel provided in an embodiment of this application;

[0031] Figure 3 is a schematic diagram of a planar structure of a color filter layer exemplified in an embodiment of this application;

[0032] Figure 4 is a schematic cross-sectional view of a sub-pixel unit provided in an embodiment of this application;

[0033] Figure 5 is a schematic cross-sectional view of a sub-pixel unit provided in an embodiment of this application;

[0034] Figure 6 is a schematic cross-sectional view of another display panel provided in an embodiment of this application;

[0035] Figure 7 is a schematic diagram of another planar structure of a color filter layer exemplified in an embodiment of this application;

[0036] Figure 8 is a schematic cross-sectional view of another display panel provided in an embodiment of this application;

[0037] Figure 9 is a schematic cross-sectional view of another display panel provided in an embodiment of this application;

[0038] Figure 10 is a schematic diagram of a display panel process provided in an embodiment of this application. Detailed Implementation

[0039] 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.

[0040] In related technologies, a display panel includes a substrate and multiple pixel units located on the substrate. Each pixel unit includes multiple sub-pixel units, and each sub-pixel unit includes a stacked first electrode, multiple light-emitting layers, and a second electrode. The multiple stacked light-emitting layers emit light of different colors. For example, each sub-pixel unit includes a stacked first electrode, a red light-emitting layer, a green light-emitting layer, a blue light-emitting layer, and a second electrode.

[0041] To light up any single-color sub-pixel unit, multiple light-emitting layers will emit light simultaneously after current is applied to the first and second electrodes. For example, to light up the blue sub-pixel unit, the red, green, and blue light-emitting layers will emit light simultaneously. However, the light emitted by the red light-emitting layer does not help to improve the brightness of the blue sub-pixel unit, and the light emitted by the green light-emitting layer has a limited effect on improving the brightness of the blue sub-pixel unit. Therefore, the emission of light from the red and green light-emitting layers will result in a higher power consumption for lighting up the blue sub-pixel unit in the display panel. The same applies to lighting up the red or green sub-pixel unit, thus resulting in a higher power consumption for the display panel.

[0042] To this end, this application reduces the power consumption of a single sub-pixel unit by setting multiple independently controlled light-emitting units stacked in the sub-pixel unit. In addition, this application also forms a resonant cavity by setting a reflective electrode and a semi-transparent semi-reflective electrode on both sides of at least one light-emitting layer. Under the action of the microcavity effect, the luminous efficiency of the light-emitting layer located between the reflective electrode and the semi-transparent semi-reflective electrode is improved, thereby reducing the power consumption of at least some sub-pixel units when they are lit without changing the brightness of the sub-pixel unit.

[0043] Figure 1 is a cross-sectional structural diagram of a display panel provided in an embodiment of this application, and Figure 2 is a planar structural diagram of a display panel provided in an embodiment of this application. Figure 1 is a cross-sectional structural diagram of Figure 2 along section line AA. As shown in Figures 1 and 2, the display panel includes a first substrate 1, a second substrate 2, a plurality of pixel units p located between the first substrate 1 and the second substrate 2, and a first driving circuit 41 and a second driving circuit 42, wherein the first substrate 1 is a transparent substrate. The pixel unit p includes a plurality of sub-pixel units, and the sub-pixel units include at least a first light-emitting unit 31 and a second light-emitting unit 32 stacked in a first direction x, where the first direction x is the direction from the first substrate 1 to the second substrate 2. The first light-emitting unit 31 is electrically connected to the first driving circuit 41, and the second light-emitting unit 32 is electrically connected to the second driving circuit 42. The first driving circuit 41 is located on the side of the first light-emitting unit 31 away from the second light-emitting unit 32, and the second driving circuit 42 is located on the side of the second light-emitting unit 32 away from the first light-emitting unit 31. In at least one sub-pixel unit, in the first direction x, the first light-emitting unit 31 includes a first electrode 311, a first light-emitting layer 312 and a second electrode 313 stacked in sequence, and the second light-emitting unit 32 includes a third electrode 321, a second light-emitting layer 322 and a fourth electrode 323 stacked in sequence, the fourth electrode 323 being a reflective electrode, and one of the first electrode 311, the second electrode 313 and the third electrode 321 being a semi-transparent and semi-reflective electrode, and a resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode.

[0044] It should be noted that the first driving circuit 41 and the second driving circuit 42 in Figure 1 are only for illustrating the relative positional relationship between the first driving circuit 41 and the second driving circuit 42 and the first light-emitting unit 31 and the second light-emitting unit 32, respectively. They do not represent that there is a whole film layer structure on the side of the first light-emitting unit 31 away from the second light-emitting unit 32 and that the film layer structure is the first driving circuit 41, nor do they represent that there is a whole film layer on the side of the second light-emitting unit 32 away from the first light-emitting unit 31 and that the film layer structure is the second driving circuit 42.

[0045] It should be noted that, in order to clearly label other structures besides pixel unit p (such as the first sub-pixel opening 510 and the second sub-pixel opening 520), only one pixel unit p and some sub-pixel units located within another pixel unit p are labeled for example.

[0046] It should be noted that, in order to clearly illustrate the distribution of each sub-pixel unit, other structures located above the first light-emitting unit 31, such as the first substrate 1 and the first driving circuit 41, are not shown in Figure 2, nor is the second driving circuit 42 shown.

[0047] For example, the first substrate 1 is a transparent substrate, and the display surface of the display panel is located on the side of the first light-emitting unit 31 away from the second light-emitting unit 32.

[0048] By fabricating multiple light-emitting units 30 in the first direction x to form a sub-pixel unit, the multiple light-emitting units 30 include a first light-emitting unit 31 and a second light-emitting unit 32. Since the first light-emitting unit 31 is connected to the first driving circuit 41 and the second light-emitting unit 32 is connected to the second driving circuit 42, the first light-emitting unit 31 and the second light-emitting unit 32 can be controlled independently. Thus, in a sub-pixel unit, for example in a monochrome sub-pixel unit, only some light-emitting units can be lit to reduce the power consumption when a single sub-pixel unit is lit.

[0049] In one possible embodiment, as shown in Figures 1 and 2, one of the first light-emitting unit 31 and the second light-emitting unit 32 is a blue light-emitting unit, and the other is a yellow light-emitting unit; the pixel unit includes a red sub-pixel unit p1, a green sub-pixel unit p2, and a first blue sub-pixel unit p3. For the first blue sub-pixel unit p3, only the blue light-emitting unit needs to be supplied with current, and no current needs to be supplied with the yellow light-emitting unit, thus reducing the power consumption when the first blue sub-pixel unit p3 is lit; for the red sub-pixel unit p1 or the green sub-pixel unit p2, only the yellow light-emitting unit needs to be supplied with current, and no current needs to be supplied with the blue light-emitting unit, thus reducing the power consumption when the red sub-pixel unit p1 and the yellow sub-pixel unit p2 are lit.

[0050] In other words, in related technologies, current needs to be applied to all the stacked and connected light-emitting layers within a sub-pixel unit to light up the sub-pixel unit. However, for monochromatic sub-pixel units, the light emitted by some light-emitting layers is not conducive to improving the brightness of the monochromatic sub-pixel unit or has a limited effect on improving the brightness of the monochromatic sub-pixel unit, and the power consumption of lighting up these light-emitting layers is relatively large. In contrast, the sub-pixel unit in this application includes at least a stacked and independently controllable first light-emitting unit 31 and a second light-emitting unit 32. Therefore, only the light-emitting units 30 that are beneficial to improving the brightness of the sub-pixel unit can be lit up in the sub-pixel unit, while the light-emitting units 30 that are not beneficial to improving the brightness of the sub-pixel unit or have a limited effect on improving the brightness of the sub-pixel unit are not lit up. This can reduce the power consumption when a single sub-pixel unit is lit up, especially the power consumption when a monochromatic sub-pixel unit is lit up.

[0051] Furthermore, since the fourth electrode 323 is a reflective electrode, and one of the first electrode 311, the second electrode 312, and the third electrode 321 is a semi-transparent and semi-reflective electrode, a resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode. As a result, under the effect of the microcavity effect, the spectrum of light located in the resonant cavity has a relatively wide and low peak, while the spectrum of light emitted from the resonant cavity has a relatively narrow and high peak. Since the spectrum of light emitted from the resonant cavity has a high peak, the arrangement of the reflective electrode and the semi-transparent and semi-reflective electrode can improve the luminous efficiency of the light-emitting layer located between the reflective electrode and the semi-transparent and semi-reflective electrode. Thus, the power consumption when at least some sub-pixel units are lit can be reduced without changing the brightness of the sub-pixel units. For example, for a monochrome sub-pixel unit, if the blue emitting layer is located between the reflective electrode and the semi-reflective electrode, it helps reduce the power consumption when the blue sub-pixel unit is lit. Similarly, if the sub-pixel unit is a white sub-pixel unit, both the first and second emitting units can be white emitting units. In this case, at least one white emitting layer is located between the reflective electrode and the semi-reflective electrode. Under the microcavity effect, the luminous efficiency of the white emitting layer located between the reflective electrode and the semi-reflective electrode is improved, thereby reducing the power consumption when the white sub-pixel unit is lit without changing its brightness. Therefore, regardless of whether it is a monochrome or white sub-pixel unit, independently controlled first and second emitting units, as well as the arrangement of the semi-reflective electrode and the reflective electrode, can all help reduce the power consumption when the sub-pixel unit is lit.

[0052] Furthermore, in related technologies, since the sub-pixel unit comprises multiple stacked light-emitting layers, a charge-generating layer (CGL) is typically required between every two adjacent light-emitting layers to provide charge carriers to the light-emitting layers located on both sides of the CGL layer, thereby improving charge injection efficiency and thus enhancing light extraction efficiency. However, because the CGL contains a low concentration of highly reactive and easily oxidized metal elements, such as lithium, and is often fabricated by co-depositing the aforementioned metal elements with the electron transport layer (ETL) material in the light-emitting layer, the uniformity of the metal element distribution is difficult to control, making the fabrication of the CGL process quite challenging. In the embodiments of this application, since the sub-pixel unit comprises multiple stacked light-emitting units, the CGL can be fabricated with little or no fabrication, reducing the manufacturing difficulty of the display panel.

[0053] In summary, the display panel provided in this application embodiment, by setting a first light-emitting unit and a second light-emitting unit stacked in a first direction and independently controllable in the sub-pixel unit, can illuminate only a portion of the light-emitting units in a sub-pixel unit, thereby reducing the power consumption of a single sub-pixel unit. Furthermore, the fourth electrode is a reflective electrode, and one of the first, second, and third electrodes is a semi-transparent, semi-reflective electrode. A resonant cavity is formed between the reflective electrode and the semi-transparent, semi-reflective electrode, thereby improving the luminous efficiency of the light-emitting layer located between the reflective electrode and the semi-transparent, semi-reflective electrode under the effect of the microcavity effect. Therefore, the power consumption when at least some sub-pixel units are illuminated can be reduced without changing the brightness of the sub-pixel unit. In addition, this application embodiment can eliminate or minimize the fabrication of the CGL located between two adjacent stacked light-emitting layers, thereby reducing the manufacturing difficulty of the display panel.

[0054] In one possible embodiment, in at least one sub-pixel unit, the third electrode 321 is a semi-transparent, semi-reflective electrode. Setting the third electrode 321 as a semi-transparent, semi-reflective electrode can increase the brightness of the light emitted by the second light-emitting unit 32. Therefore, for the second light-emitting unit 32 with a semi-transparent, semi-reflective electrode, and the sub-pixel unit where the second light-emitting unit 32 is located, if the second light-emitting unit 32 emits light when the sub-pixel unit is lit, setting the third electrode 321 as a semi-transparent, semi-reflective electrode can increase the brightness of the sub-pixel unit. That is, under the premise that the brightness of the sub-pixel unit remains unchanged, setting the third electrode 321 as a semi-transparent, semi-reflective electrode can reduce the power consumption when the sub-pixel unit is lit. Furthermore, since the third electrode 321 is closest to the reflective electrode (i.e., the fourth electrode 323) among the first electrode 311, the second electrode 313, and the third electrode 321, setting the third electrode 321 as a semi-transparent and semi-reflective electrode can improve the light emission efficiency of the light-emitting layer between the semi-transparent and semi-reflective electrode in the resonant cavity formed between the semi-transparent and semi-reflective electrode under the effect of the microcavity effect. This avoids the situation where the distance between the semi-transparent and semi-reflective electrode and the reflective electrode is too far, or there are too many film layers between the reflective electrode and the semi-transparent and semi-reflective electrode, which would otherwise result in a poor improvement in the light emission efficiency of the light-emitting layer between the semi-transparent and semi-reflective electrode. For example, the display panel also includes a first encapsulation layer located on the side of the first light-emitting unit 31 near the second light-emitting unit 32. Setting the third electrode 321 as a semi-transparent and semi-reflective electrode can reduce the possibility of the resonant cavity being affected by the first encapsulation layer.

[0055] In other possible embodiments, in at least one sub-pixel unit, the second electrode 313 can also be set as a semi-transparent and semi-reflective electrode to improve the brightness of the light emitted by the second light-emitting unit 32. Therefore, for the first light-emitting unit 31 with a semi-transparent and semi-reflective electrode, and the sub-pixel unit where the first light-emitting unit 31 is located, if the second light-emitting unit 32 emits light when the sub-pixel unit is lit, setting the second electrode 313 as a semi-transparent and semi-reflective electrode can improve the brightness of the sub-pixel unit. That is, under the premise that the brightness of the sub-pixel unit remains unchanged, setting the second electrode 313 as a semi-transparent and semi-reflective electrode can reduce the power consumption when the sub-pixel unit is lit.

[0056] In other possible embodiments, in at least one sub-pixel unit, the first electrode 311 may also be configured as a semi-transparent and semi-reflective electrode to improve the brightness of the light emitted by at least one of the first light-emitting units 31 and the second light-emitting unit 32. Therefore, for the first light-emitting unit 32 with a semi-transparent and semi-reflective electrode, and the sub-pixel unit in which the first light-emitting unit 32 is located, if at least one of the first light-emitting units 31 and the second light-emitting unit 32 emits light when the sub-pixel unit is lit, configuring the first electrode 311 as a semi-transparent and semi-reflective electrode can improve the brightness of the sub-pixel unit. That is, under the premise that the brightness of the sub-pixel unit remains unchanged, configuring the first electrode 311 as a semi-transparent and semi-reflective electrode can reduce the power consumption when the sub-pixel unit is lit.

[0057] For example, the material used to make the fourth electrode 323, which is also the reflective electrode, includes one or more metallic materials, such as silver, aluminum, etc.

[0058] For example, one of the first electrode 311, the second electrode 313, and the third electrode 321 is a semi-transparent and semi-reflective electrode, while the other two electrodes are transparent electrodes. The semi-transparent and semi-reflective electrode is made of materials such as magnesium-silver alloy and magnesium-molybdenum alloy, while the transparent electrode is made of materials such as indium tin oxide (ITO) and indium zinc oxide (IZO).

[0059] In one possible embodiment, the multiple sub-pixel units include a first target sub-pixel unit and a second target sub-pixel unit with different emission colors. The transflective electrode in the first target sub-pixel unit is on the same layer as the transflective electrode in the second target sub-pixel unit. That is, in both the first and second target sub-pixel units, the first electrode 311 is a transflective electrode; or, in both the first and second target sub-pixel units, the second electrode 313 is a transflective electrode; or, in both the first and second target sub-pixel units, the third electrode 321 is a transflective electrode. Placing the transflective electrodes on the same layer can save on manufacturing processes and reduce costs.

[0060] In another possible embodiment, the plurality of sub-pixel units include a first target sub-pixel unit and a second target sub-pixel unit with different emission colors. In the first direction x, the transflective electrode in the first target sub-pixel unit is located on one side of the transflective electrode in the second target sub-pixel unit, that is, the transflective electrode in the first target sub-pixel unit is on a different layer from the transflective electrode in the second target sub-pixel unit. For example, in the first target sub-pixel unit, the first electrode 311 is a transflective electrode, and in the second target sub-pixel unit, the second electrode 313 or the third electrode 321 is a transflective electrode; or, in the first target sub-pixel unit, the second electrode 313 is a transflective electrode, and in the second target sub-pixel unit, the first electrode 311 or the third electrode 321 is a transflective electrode; or, in the first target sub-pixel unit, the third electrode 321 is a transflective electrode, and in the second target sub-pixel unit, the first electrode 311 or the second electrode 313 is a transflective electrode. Depending on the color of the light emitted by the sub-pixel unit, different electrodes can be set as semi-transparent and semi-reflective electrodes to improve the brightness of the second light-emitting unit 32, or to simultaneously improve the brightness of the first light-emitting unit 31 and the second light-emitting unit 32.

[0061] Figure 3 is a schematic diagram of a planar structure of a color filter layer exemplified in an embodiment of this application. In one possible embodiment, as described above, as shown in Figures 1, 2, and 3, one of the first light-emitting unit 31 and the second light-emitting unit 32 is a blue light-emitting unit, and the other is a yellow light-emitting unit; the pixel unit includes a red sub-pixel unit p1, a green sub-pixel unit p2, and a first blue sub-pixel unit p3. Furthermore, as shown in Figures 1 and 3, the display panel also includes a color filter layer 5, which is located on the side of the first light-emitting unit 31 away from the second light-emitting unit 32. The color filter layer 5 includes a red color resist block 51, a green color resist block 52, and a first cut-out area 53. The orthographic projection of the red color resist block 51 on the second substrate 2 at least partially coincides with the orthographic projection of the red sub-pixel unit p1 on the second substrate 2, the orthographic projection of the green color resist block 52 on the second substrate 2 at least partially coincides with the orthographic projection of the green sub-pixel unit p2 on the second substrate 2, and the orthographic projection of the first cut-out area 53 on the second substrate 2 at least partially coincides with the orthographic projection of the first blue sub-pixel unit p3 on the second substrate 2. Because the light emission efficiency of blue light in related technologies is low, resulting in low brightness of blue sub-pixel units, in this embodiment of the application, if a sub-pixel unit includes multiple light-emitting units 30 including a first light-emitting unit 31 and a second light-emitting unit 32 stacked as shown in FIG1, one of the light-emitting units can be set as a blue light-emitting unit, and a first cutout area 53 is set above the blue sub-pixel unit p3, so that when the first blue sub-pixel unit p3 is lit, the yellow unit in the first blue sub-pixel unit p3 does not emit light, the blue light-emitting unit emits light and the emitted light is emitted through the first cutout area 53, that is, the light emitted by the blue light-emitting unit can be emitted directly without passing through the color resist block, thereby improving the brightness of the first blue sub-pixel unit p3, that is, improving the brightness of the display panel when emitting blue light. In this embodiment, when the red sub-pixel unit p1 is lit, the blue light-emitting unit in the red sub-pixel unit p1 does not emit light, the yellow light-emitting unit emits light and the emitted light is emitted through the red color block 51; when the green sub-pixel unit p2 is lit, the blue light-emitting unit in the green sub-pixel unit p2 does not emit light, the yellow light-emitting unit emits light and the emitted light is emitted through the green color block 52.

[0062] For example, as shown in Figures 1 and 3, the color filter layer 5 also includes a black matrix 55, which is located between two adjacent color blocks, between two adjacent cutout areas, and between adjacent color blocks and cutout areas. The black matrix 55 can prevent light leakage.

[0063] It should be noted that, in order to make the other structures in Figure 1 and Figure 3 clear, the black matrix 55 in Figure 1 and Figure 3 is not pattern-filled. In addition, in order to clearly show the relative positional relationship between each structure in the color filter layer 5 and the sub-pixel unit, the positions of multiple sub-pixel units are indicated by dashed lines.

[0064] In other possible embodiments, as shown in FIG1, within a sub-pixel unit, one of the first light-emitting unit 31 and the second light-emitting unit 32 is a blue light-emitting unit, and the light-emitting layer of the other light-emitting unit includes a stacked red light-emitting layer and a green light-emitting layer. Pixel unit p includes a red sub-pixel unit p1, a green sub-pixel unit p2, and a first blue sub-pixel unit p3. Furthermore, the display panel also includes a color filter layer 5, located on the side of the first light-emitting unit 31 away from the second light-emitting unit 32. The color filter layer 5 includes a red color resist block 51, a green color resist block 52, and a first cut-out area 53. The orthographic projection of the red color resist block 51 on the second substrate 2 at least partially coincides with the orthographic projection of the red sub-pixel unit p1 on the second substrate 2; the orthographic projection of the green color resist block 52 on the second substrate 2 at least partially coincides with the orthographic projection of the green sub-pixel unit p2 on the second substrate 2; and the orthographic projection of the first cut-out area 53 on the second substrate 2 at least partially coincides with the orthographic projection of the first blue sub-pixel unit p3 on the second substrate 2. Unlike the previous embodiments, in the first light-emitting unit 31 and the second light-emitting unit 32, the other light-emitting unit besides the blue light-emitting unit may not be a yellow light-emitting unit, but rather a light-emitting unit whose light-emitting layer includes stacked red and green light-emitting layers. In this embodiment, when the red sub-pixel unit p1 is lit, the blue light-emitting unit in the red sub-pixel unit p1 does not emit light, and the other light-emitting unit emits red and green light, and the emitted light is emitted through the red color resist block 51; when the green sub-pixel unit p2 is lit, the blue light-emitting unit in the green sub-pixel unit p2 does not emit light, and the other light-emitting unit emits red and green light, and the emitted light is emitted through the green color resist block 52; when the first blue sub-pixel unit p3 is lit, only the blue light-emitting unit in the first blue sub-pixel unit p3 emits light, and the emitted light is emitted through the first cutout area 53, that is, the light emitted by the blue light-emitting unit can be emitted directly without passing through the color resist block, thereby improving the brightness of the first blue sub-pixel unit p3, that is, improving the brightness of the display panel when emitting blue light.

[0065] In other possible embodiments, one of the first light-emitting unit 31 and the second light-emitting unit 32 may be a red light-emitting unit, and the other may be a cyan light-emitting unit or a blue-green light-emitting unit. Furthermore, the color filter layer includes a green color block and a blue color block. In this embodiment, when the red sub-pixel unit is lit, the blue-green light-emitting unit within the red sub-pixel unit does not emit light, and the red light-emitting unit emits light and can be emitted directly without passing through the color block; when the green sub-pixel unit is lit, the red light-emitting unit within the green sub-pixel unit does not emit light, and the blue-green light-emitting unit emits light and needs to pass through the green color block before being emitted; when the blue sub-pixel unit is lit, the red light-emitting unit within the blue sub-pixel unit does not emit light, and the blue-green light-emitting unit emits light and needs to pass through the blue color block before being emitted.

[0066] In one possible embodiment, as shown in FIG1, within the sub-pixel unit, the second light-emitting unit 32 is a blue light-emitting unit, and the second electrode 313 or the third electrode 321 is a semi-transparent, semi-reflective electrode. The light-emitting layer between the reflective electrode and the semi-transparent, semi-reflective electrode consists only of the blue light-emitting layer located within the second light-emitting unit 32, thereby further enhancing the brightness of the first blue sub-pixel unit p3 under the effect of the microcavity effect, thus further enhancing the brightness of the display panel when emitting blue light. In other possible embodiments, within the sub-pixel unit, the first light-emitting unit 31 may also be a blue light-emitting unit, and the second light-emitting unit 32 may be a yellow unit.

[0067] Figure 4 is a schematic cross-sectional view of a sub-pixel unit provided in an embodiment of this application. In the embodiment shown in part (a) of Figure 4, the first light-emitting unit 31 is a yellow light-emitting unit and the second light-emitting unit 32 is a blue light-emitting unit; in the embodiment shown in part (b) of Figure 4, the first light-emitting unit 31 is a blue light-emitting unit and the second light-emitting unit 32 is a yellow light-emitting unit.

[0068] For example, as shown in parts (a) and (b) of FIG4, the display panel further includes a first encapsulation layer 81 and a second encapsulation layer 82. The first encapsulation layer 81 is located on the side of the first light-emitting unit 31 near the second light-emitting unit 32, and the second encapsulation layer 82 is located on the side of the second light-emitting unit 32 near the first light-emitting unit 31, so as to encapsulate the first light-emitting unit 31 and the second light-emitting unit 32 respectively, to prevent the electrode layers in the first light-emitting unit 31 and the second light-emitting unit 32 from being corroded by moisture and affecting the display function of the display panel, and to prevent the light-emitting layers in the first light-emitting unit 31 and the second light-emitting unit 32 from absorbing water and affecting the display function of the display panel. Optionally, the first encapsulation layer 81 and the second encapsulation layer 82 are both made of inorganic encapsulation materials.

[0069] In one possible embodiment, referring again to Figures 1, 2, and 3, the pixel unit p further includes a white sub-pixel unit p4. Within the white sub-pixel unit p4, one of the first electrode 311, the second electrode 313, and the third electrode 321 is a semi-transparent, semi-reflective electrode. The white sub-pixel unit p4 can enhance the brightness of the display panel. When the white sub-pixel unit p4 is lit, both the first light-emitting unit 31 and the second light-emitting unit 32 emit light. Therefore, if the first electrode 311 in the white sub-pixel unit p4 is a semi-transparent, semi-reflective electrode, the brightness of the light emitted by the first light-emitting unit 31 and the second light-emitting unit 32 can be enhanced simultaneously. If the second electrode 313 or the third electrode 321 is a semi-transparent, semi-reflective electrode, the brightness of the light emitted by the second light-emitting unit 32 can be enhanced. Therefore, compared to the white sub-pixel unit p4 having all first electrodes 311, second electrodes 313, and third electrodes 321 as transparent electrodes, having one of these electrodes as a semi-transparent, semi-reflective electrode can improve the brightness of the white sub-pixel unit p4.

[0070] For example, as shown in Figures 1 and 3, the color filter layer also includes a cutout region 54 corresponding to the white sub-pixel unit p4. In this embodiment, the cutout region 54 corresponding to the white sub-pixel unit p4 is also called the third cutout region 54. The orthographic projection of the third cutout region 54 on the second substrate 2 at least partially overlaps with the orthographic projection of the white sub-pixel unit p4 on the second substrate 2. Therefore, the light emitted by the first light-emitting unit 31 and the second light-emitting unit 32 in the white sub-pixel unit p4 is emitted through the third cutout region 54. That is, the first light-emitting unit 31 and the second light-emitting unit 32 can be emitted directly without passing through the color resist block, thereby improving the brightness of the white sub-pixel unit p4 and thus improving the brightness of the display panel.

[0071] In one possible embodiment, the light-emitting layer of the yellow light-emitting unit includes a stacked red light-emitting layer and a yellow light-emitting layer. If the yellow light-emitting unit only emits yellow light, the brightness of the light emitted by the yellow light-emitting unit in the red sub-pixel unit p1 after passing through the red color resist block 51 is low. Therefore, the yellow light-emitting unit emits both red and yellow light simultaneously, which can improve the brightness of the red sub-pixel unit p1. Optionally, the yellow light-emitting unit also includes a CGL located between the red and yellow light-emitting layers, thereby providing charge carriers to the red and yellow light-emitting layers located on both sides of the CGL layer, improving charge injection efficiency, and thus improving luminous efficiency and the brightness of the red and yellow light emitted by the yellow light-emitting unit.

[0072] In another possible embodiment, the light-emitting layer of the yellow light-emitting unit comprises a mixture of red and yellow light-emitting materials to enhance the brightness of the red sub-pixel unit p1. The light-emitting layer of the yellow light-emitting unit can be formed by, for example, co-evaporation of the mixed red and yellow light-emitting materials, a process that is simpler than the process of forming stacked red and yellow light-emitting layers.

[0073] The inventors compared the power consumption of the display panel emitting different colors of light in the related technologies with the power consumption of the display panel emitting different colors of light in the embodiments of this application. The comparison results are shown in Table 1. Table 1 is a comparison table of the power consumption of the display panel emitting different colors of light in the related technologies with the power consumption of the display panel emitting different colors of light in the embodiments of this application.

[0074] Table 1 compares the power consumption of display panels emitting different colors of light in related technologies with the power consumption of display panels emitting different colors of light in the embodiments of this application.

[0075] As shown in Table 1, the data in the Ref column represents the power consumption of the display panel when all red sub-pixel units are lit, all green sub-pixel units are lit, and all white sub-pixel units are lit in the display panel of the related technology. The data in the Display Panel A column represents the power consumption of the display panel when all red sub-pixel units are lit, all green sub-pixel units are lit, and all white sub-pixel units are lit in the display panel A of the embodiment of this application. The data in the red (power consumption / watt) row refers to the power consumption calculations performed on the display panel in the related technology and the display panel in the embodiment of this application, under the premise of the same red brightness. The data in the green and white rows are calculated similarly and will not be repeated here. In the related technology, a sub-pixel unit includes only one light-emitting unit, and the light-emitting unit includes a reflective electrode, a transparent electrode, and a blue light-emitting layer and a yellow light-emitting layer located between the reflective electrode and the transparent electrode. In display panel A, the second electrode 313 is a semi-transparent and semi-reflective electrode, while the first electrode 311 and the third electrode 321 are both transparent electrodes. The first light-emitting unit is a blue light-emitting unit, and the second light-emitting unit is a yellow light-emitting unit. As shown in Table 1, it can be seen that compared with display panels in related technologies, under the premise of the same brightness for the corresponding light-emitting colors, the power consumption of the display panel in this embodiment is reduced when emitting red light, green light, and white light.

[0076] In one possible embodiment, the blue light-emitting unit includes only one blue light-emitting layer. In other possible embodiments, the blue light-emitting unit includes two stacked blue light-emitting layers and a CGL located between the two stacked blue light-emitting layers. By providing two blue light-emitting layers and a CGL located between them in the blue light-emitting unit, the brightness of the light emitted by the blue light-emitting unit can be increased, thereby further increasing the brightness of the first blue sub-pixel unit p3, that is, further increasing the brightness of the display panel when emitting blue light; and it can also further increase the brightness of the white sub-pixel unit p4.

[0077] Figure 5 is a cross-sectional structural diagram of a sub-pixel unit provided in an embodiment of this application. In the embodiment shown in part (a) of Figure 5, the first light-emitting unit 31 is a yellow light-emitting unit, the second light-emitting unit 32 is a blue light-emitting unit, and the second light-emitting unit 32 includes two stacked blue light-emitting layers; in the embodiment shown in part (b) of Figure 5, the first light-emitting unit 31 is a blue light-emitting unit, the second light-emitting unit 32 is a yellow light-emitting unit, and the first light-emitting unit 31 includes two stacked blue light-emitting layers.

[0078] The inventors compared the power consumption of the display panel emitting different colors of light in the related technologies with the power consumption of the display panel emitting different colors of light in the embodiments of this application. The comparison results are shown in Table 2. Table 2 is a comparison table of the power consumption of the display panel emitting different colors of light in the related technologies with the power consumption of the display panel emitting different colors of light in the embodiments of this application.

[0079] As shown in Table 2, the data in the Ref column represents the power consumption of the display panel when all red sub-pixel units are lit, all green sub-pixel units are lit, all blue sub-pixel units are lit, and all white sub-pixel units are lit in the display panel of the related technology. The data in the Display Panel B column represents the power consumption of the display panel when all red sub-pixel units are lit, all green sub-pixel units are lit, all blue sub-pixel units are lit, and all white sub-pixel units are lit in the display panel B of the embodiment of this application. The data in the red (power consumption / watt) row refers to the power consumption calculations performed on the display panel in the related technology and the display panel in the embodiment of this application, under the premise of the same red brightness. The data in the green, blue, and white rows are calculated similarly and will not be repeated here. In the related technology, a sub-pixel unit includes only one light-emitting unit, and the light-emitting unit includes a reflective electrode, a transparent electrode, and a blue light-emitting layer, a yellow light-emitting layer, and a blue light-emitting layer stacked sequentially between the reflective electrode and the transparent electrode. In display panel B, the second electrode 313 is a semi-transparent, semi-reflective electrode, while the first electrode 311 and the third electrode 321 are both transparent electrodes. The first light-emitting unit is a blue light-emitting unit comprising two stacked blue light-emitting layers, and the second light-emitting unit is a yellow light-emitting unit. As shown in Table 2, it can be seen that compared to display panels in related technologies, under the premise of the same brightness for the corresponding light-emitting colors, the display panel in this embodiment has reduced power consumption when emitting red, green, blue, and white light.

[0080] Table 2 compares the power consumption of the display panel emitting different colors of light in related technologies with the power consumption of the display panel emitting different colors of light in the embodiments of this application.

[0081] In this embodiment, referring again to FIG1, the display panel further includes a first pixel definition layer 51 and a second pixel definition layer 52. The first pixel definition layer 51 is located on the side of the first substrate 1 near the first light-emitting unit 31. The first pixel definition layer 51 includes a plurality of first sub-pixel openings 510, and the orthographic projections of the plurality of first sub-pixel openings 510 on the second substrate 2 at least partially overlap with the orthographic projections of the plurality of sub-pixel units on the second substrate 2. The second pixel definition layer 52 is located on the side of the second substrate 2 near the second light-emitting unit 32. The second pixel definition layer 52 includes a plurality of second sub-pixel openings 520, and the orthographic projections of the plurality of second sub-pixel openings 520 on the second substrate 2 at least partially overlap with the orthographic projections of the plurality of sub-pixel units on the second substrate 2. The plurality of first sub-pixel openings 510 are opposite to the plurality of second sub-pixel openings 520. The first sub-pixel definition layer 51 and the second sub-pixel definition layer 52 can prevent crosstalk between light from different sub-pixel units. During the manufacturing process of the display panel, the first sub-pixel definition layer 51 and the second sub-pixel definition layer 52 can be formed on the first substrate 1 and the second substrate 2, respectively. Then, by using, for example, an open mask (OM), multiple light-emitting layers or electrodes within sub-pixel units can be simultaneously fabricated on the first sub-pixel definition layer 51. This process is relatively simple. During fabrication, the light-emitting layer material or electrode material not only enters the sub-pixel opening but also covers the portion of the first sub-pixel definition layer 51 located between two adjacent first sub-pixel openings 510. This portion of the first sub-pixel definition layer 51 located between two adjacent first sub-pixel openings 510 can isolate the light-emitting layer material or electrode material located in different sub-pixel units, thereby preventing the light-emitting layer material of different sub-pixel units from connecting and preventing the electrode material of different sub-pixel units from connecting, thus avoiding affecting the display effect of the display panel. Similarly, the second sub-pixel definition layer 52, located between two adjacent second sub-pixel openings 520, can isolate the light-emitting layer material or electrode material located in different sub-pixel units, thereby preventing the light-emitting layer material of different sub-pixel units from connecting and preventing the electrode material of different sub-pixel units from connecting, thus avoiding affecting the display effect of the display panel.

[0082] Optionally, for the portion of the first sub-pixel definition layer 51 located between two adjacent first sub-pixel openings 510 and the portion of the second sub-pixel definition layer 52 located between two adjacent second sub-pixel openings 520, the display panel has light-emitting material and electrode material between the first sub-pixel definition layer 51 and the second sub-pixel definition layer, and these light-emitting materials and electrode materials have no electrical connection with the light-emitting layer and electrode in the sub-pixel unit.

[0083] In one possible embodiment, as shown in FIG1, the display panel further includes a filling structure 6, which is located between the first light-emitting unit 31 and the second light-emitting unit 32, and is connected to the first light-emitting unit 31 and the second light-emitting unit 32. When aligning the plurality of first light-emitting units 31 on the first substrate 1 with the plurality of second light-emitting units 32 on the second substrate 2, a filling structure 6 can be added between the plurality of first light-emitting units 31 and the plurality of second light-emitting units to further improve the encapsulation effect of the display panel. Exemplarily, the filling structure 6 is made of a transparent organic encapsulation material, such as an epoxy resin, to facilitate better filling of the plurality of first sub-pixel openings 510 and the plurality of second sub-pixel openings 520, thereby connecting with the plurality of light-emitting units 31 and the plurality of second light-emitting units 32.

[0084] In other possible embodiments, the display panel does not include the filling structure 6, and the space between the plurality of first light-emitting units 31 and the plurality of second light-emitting units 32 is filled with air, so as to minimize the loss of light emitted by the first light-emitting units 31 and the second light-emitting units 32. For example, during the process of the light emitted by the first light-emitting unit 31 reaching the reflective electrode, i.e., the fourth electrode 323, and then being emitted towards the first substrate 1, the loss of light emitted by the first light-emitting unit 31 is reduced, and during the process of the light emitted by the second light-emitting unit 32 being emitted towards the first substrate 1, the loss of light emitted by the second light-emitting unit 32 is reduced, thereby further improving the brightness of the sub-pixel units, or reducing the power consumption of the display panel while keeping the brightness of the sub-pixel units unchanged.

[0085] Figure 6 is a cross-sectional structural diagram of another display panel provided in an embodiment of this application, and Figure 7 is a planar structural diagram of another color filter layer exemplified in an embodiment of this application. Compared with the embodiments shown in Figures 1 and 3, in the embodiments shown in Figures 6 and 7, the pixel unit p does not include the white sub-pixel unit p4, but the pixel unit p also includes the second blue sub-pixel unit p5. As shown in Figures 6 and 7, the color filter layer 5 also includes a second cut-out region 56, the orthographic projection of the second cut-out region 56 on the second substrate 2 at least partially coincides with the orthographic projection of the second blue sub-pixel unit p5 on the second substrate 2. Two blue sub-pixel units are provided in one pixel unit p, namely the first blue sub-pixel unit p3 and the second blue sub-pixel unit p5, and the light emitted by the blue light-emitting unit in the second blue sub-pixel unit p5 is emitted through the second cut-out region 56, that is, the light emitted by the blue light-emitting units in the first blue sub-pixel unit p3 and the second blue sub-pixel unit p5 can be emitted directly without passing through the color resist block, thereby further improving the brightness of the display panel when emitting blue light.

[0086] It should be noted that, in order to make the other structures in Figures 6 and 7 clear, the black matrix 55 in Figures 6 and 7 is not pattern-filled, and in Figure 7, in order to clearly show the relative positional relationship between each structure in the color filter layer 5 and the sub-pixel unit, the positions of multiple sub-pixel units are indicated by dashed lines.

[0087] Figure 8 is a cross-sectional structural diagram of another display panel provided in an embodiment of this application. As shown in Figure 8, the display panel further includes a first driving circuit layer 410 and a second driving circuit layer 420. The first driving circuit layer 410 is located on the side of the first substrate 1 near the first light-emitting unit 31, and the first driving circuit 41 (not shown in Figure 8) is located within the first driving circuit layer 410. The second driving circuit layer 420 is located on the side of the second substrate 2 near the second light-emitting unit 32, and the second driving circuit 42 (not shown in Figure 8) is located within the second driving circuit layer 420. At least a portion of the orthographic projection of the first driving circuit 41 on the second substrate 2 is located within the orthographic projection of the first sub-pixel definition layer 51 on the second substrate 2, that is, the first driving circuit is positioned as high as possible directly above the first sub-pixel definition layer 51, thereby minimizing the influence of the metal traces in the first driving circuit 41 on the light emission of the sub-pixel unit.

[0088] The following is an exemplary description of the various film layer structures within the first and second driving circuit layers of the display panel. As shown in FIG8, the second driving circuit layer 420 includes a first active layer 4201, a first gate insulating layer 4202, a first gate layer 4203, a second gate insulating layer 4204, a second gate layer 4205, a buffer layer 4206, a second active layer 4207, a third gate insulating layer 4208, a third gate layer 4209, an interlayer dielectric layer 4210, a first source-drain layer 4211, a first planarization layer 4212, a second source-drain layer 4213, a second planarization layer 4214, a third source-drain layer 4215, and a third planarization layer 4216, which are sequentially stacked on the second substrate 2.

[0089] For example, as shown in FIG8, the third planarization layer 4216 includes a plurality of vias so that the second electrode 323 of the second light-emitting unit 32 can be connected to the third source-drain layer 4215 in the second driving circuit layer 420 through the vias.

[0090] For example, the second driving circuit 42 includes multiple traces, such as multiple metal traces, located in the first gate layer 4203, the second gate layer 4205, the third gate layer 4209, the first source-drain layer 4211, the second source-drain layer 4213, and the third source-drain layer 4215.

[0091] In this embodiment, the second substrate 2 can be a rigid substrate or a flexible substrate, such as a glass substrate, a quartz substrate, or a plastic substrate. The second substrate 2 can be a single-layer or multi-layer structure. Taking a multi-layer structure as an example, the second substrate 2 includes a first polyimide layer, a first protective layer, a second polyimide layer, and a second protective layer stacked sequentially from bottom to top. The two protective layers are used to protect the polyimide layer and prevent damage to the polyimide layer by subsequent processes. The second substrate 2 is also covered with a buffer layer, which can block water and oxygen and block alkaline ions.

[0092] For example, the first active layer 4201 is made of low-temperature polycrystalline silicon, and the second active layer 4207 is made of metal oxide semiconductor materials such as indium gallium zinc oxide (IGZO).

[0093] For example, the materials used to fabricate the first gate insulating layer 4202, the second gate insulating layer 4204, the third gate insulating layer 4208, and the interlayer dielectric layer 4210 include silicon oxide, silicon nitride, silicon nitride, and at least one of these.

[0094] For example, the materials used to fabricate the first gate layer 4203, the second gate layer 4205, and the third gate layer 4209 include metallic materials, such as one or more of molybdenum, copper, and aluminum.

[0095] For example, the materials used to make the first planarization layer 4212, the second planarization layer 4214 and the third planarization layer 4216 include organic insulating materials, such as resin.

[0096] For example, the first source-drain layer 4211, the second source-drain layer 4213, and the third source-drain layer 4215 comprise multiple layers of metal stacked sequentially. For instance, the third source-drain layer 4215 may comprise a molybdenum layer, an aluminum layer, and a molybdenum layer stacked sequentially, or it may comprise a titanium layer, an aluminum layer, and a titanium layer stacked sequentially.

[0097] Exemplarily, each film layer structure in the first driving circuit layer 410 is disposed opposite to each film layer structure in the second driving circuit layer 420. For example, in the first direction x, the first driving circuit layer 410 also includes a first active layer, a first gate insulating layer, a first gate layer, a second gate insulating layer, a second gate layer, a buffer layer, a second active layer, a third gate insulating layer, a third gate layer, an interlayer dielectric layer, a first source-drain layer, a first planarization layer, a second source-drain layer, a second planarization layer, a third source-drain layer, and a third planarization layer, which are sequentially stacked on the first substrate 1. The fabrication materials of each film layer structure in the first driving circuit layer 410 are the same as those of the film layer structures in the second driving circuit layer 410, and will not be described again here. Exemplarily, the first driving circuit 41 includes multiple traces, such as multiple metal traces, located in the first gate layer, the second gate layer, the third gate layer, the first source-drain layer, the second source-drain layer, and the third source-drain layer.

[0098] In the foregoing embodiments, the display panel includes a first substrate 1, a second substrate 2, a plurality of first light-emitting units 31 located on the first substrate 1, and a plurality of second light-emitting units located on the second substrate 2. Figure 9 is a schematic cross-sectional structure diagram of another display panel provided in an embodiment of this application. As shown in Figure 9, in other possible embodiments, the sub-pixel unit further includes a third light-emitting unit 33, a third substrate 7, and a third driving circuit 43 located between the first light-emitting unit 31 and the second light-emitting unit 32. The colors of the light emitted by the first light-emitting unit 31, the second light-emitting unit 32, and the third light-emitting unit 33 are different from each other, and the third light-emitting unit 33 is connected to the third driving circuit 43. In the first direction x, the third light-emitting unit 33 includes a fifth electrode 331, a third light-emitting layer 332, and a sixth electrode 333 stacked sequentially. In the first direction x, three light-emitting units can also be provided. As is known from the foregoing, the first light-emitting unit 31 and the second light-emitting unit 32 can be controlled independently. Since the third light-emitting unit 33 is connected to the third driving circuit 43, the first light-emitting unit 31, the second light-emitting unit 32, and the third light-emitting unit 33 can all be controlled independently. Therefore, in different sub-pixel units, only one light-emitting unit can be controlled to emit light individually, thereby reducing the power consumption of the monochrome sub-pixel unit. For example, the first light-emitting unit 31, the second light-emitting unit 32, and the third light-emitting unit 33 can be a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit, respectively. Therefore, when the red sub-pixel unit is lit, only the red light-emitting unit can be controlled to emit light, thereby reducing the power consumption when the red sub-pixel unit is lit. The same applies to lighting up the green or blue sub-pixel unit, which will not be elaborated here.

[0099] In one possible embodiment, as shown in FIG9, the third substrate 7 is located on the side of the third light-emitting unit 33 away from the first light-emitting unit 31, and the third driving circuit 43 is located between the third light-emitting unit 33 and the third substrate 7.

[0100] It should be noted that the third driving circuit 43 in Figure 9 is only for illustrating the relative positional relationship between the third driving circuit 43 and the third light-emitting unit 33, and does not represent that there is a whole film layer on the side of the third light-emitting unit 31 away from the first light-emitting unit 31 and that the film layer structure is the third driving circuit 43.

[0101] In other possible embodiments, the third driving circuit 43 and the third substrate 7 may also be located on the side of the third light-emitting unit 33 close to the first light-emitting unit 31.

[0102] In summary, the display panel provided in this application embodiment, by setting a first light-emitting unit and a second light-emitting unit stacked in a first direction and independently controllable in the sub-pixel unit, can illuminate only a portion of the light-emitting units in a sub-pixel unit, thereby reducing the power consumption of a single sub-pixel unit. Furthermore, the fourth electrode is a reflective electrode, and one of the first, second, and third electrodes is a semi-transparent, semi-reflective electrode. A resonant cavity is formed between the reflective electrode and the semi-transparent, semi-reflective electrode, thereby improving the luminous efficiency of the light-emitting layer located between the reflective electrode and the semi-transparent, semi-reflective electrode under the effect of the microcavity effect. Therefore, the power consumption when at least some sub-pixel units are illuminated can be reduced without changing the brightness of the sub-pixel unit. In addition, this application embodiment can eliminate or minimize the fabrication of the CGL located between two adjacent stacked light-emitting layers, thereby reducing the manufacturing difficulty of the display panel.

[0103] Figure 10 is a schematic diagram of a flow method for a display panel provided in an embodiment of this application. As shown in Figure 8, the method includes:

[0104] Step 1001: Provide a first substrate and a second substrate.

[0105] Step 1002: Fabricate multiple light-emitting units on the first substrate and the second substrate respectively, and connect the first substrate and the second substrate relative to each other to obtain a display panel.

[0106] The first substrate is a transparent substrate. The display panel includes multiple pixel units, a first driving circuit, and a second driving circuit located between the first substrate and the second substrate. Each pixel unit includes multiple sub-pixel units, and each sub-pixel unit includes multiple light-emitting units stacked in a first direction, which is the direction from the first substrate to the second substrate. The multiple light-emitting units include first light-emitting units and second light-emitting units stacked in the first direction. The first light-emitting unit and the second light-emitting unit are respectively connected to the first driving circuit and the second driving circuit and emit light of different colors. The first driving circuit is located on the side of the first light-emitting unit away from the second light-emitting unit, and the second driving circuit is located on the side of the second light-emitting unit away from the first light-emitting unit. In at least one sub-pixel unit, in the first direction, the first light-emitting unit includes a first electrode, a first light-emitting layer, and a second electrode stacked sequentially. The second light-emitting unit includes a third electrode, a second light-emitting layer, and a fourth electrode stacked sequentially. The fourth electrode is a reflective electrode. One of the first, second, and third electrodes is a semi-transparent and semi-reflective electrode. A resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode.

[0107] In summary, the display panel manufacturing method provided in this application provides a display panel comprising multiple pixel units, each pixel unit including multiple sub-pixel units. By setting a first light-emitting unit and a second light-emitting unit stacked in a first direction and independently controllable within the sub-pixel units, only a portion of the light-emitting units in a single sub-pixel unit can be illuminated, reducing the power consumption of a single sub-pixel unit. Furthermore, the fourth electrode is a reflective electrode, and one of the first, second, and third electrodes is a semi-transparent, semi-reflective electrode. A resonant cavity is formed between the reflective electrode and the semi-transparent, semi-reflective electrode, thereby improving the luminous efficiency of the light-emitting layer located between the reflective electrode and the semi-transparent, semi-reflective electrode under the effect of the microcavity effect. Therefore, the power consumption when at least some sub-pixel units are illuminated can be reduced without changing the brightness of the sub-pixel units. In addition, this application embodiment can eliminate or minimize the fabrication of the CGL located between two adjacent stacked light-emitting layers, thereby reducing the manufacturing difficulty of the display panel.

[0108] For example, by using an open mask (OM) and by means of, for example, vapor deposition, light-emitting layers in multiple subpixels can be fabricated simultaneously.

[0109] For example, by using an open mask (OM) and by means of, for example, vapor deposition, semi-transparent and semi-reflective electrodes located in the same layer in multiple sub-pixels can be fabricated simultaneously to save on processes and reduce costs.

[0110] For example, by using an open mask (OM) and by means of sputtering, reflective electrodes in multiple sub-pixels located in the same layer, or transparent electrodes in multiple sub-pixels located in the same layer, processes can be saved and costs reduced.

[0111] For example, semi-transparent and semi-reflective electrodes located in different layers in multiple sub-pixel units are fabricated using a fine metal mask (FMM).

[0112] This application also provides a driving method for a display panel. The driving method controls a display panel, which includes a first substrate, a second substrate, and a plurality of pixel units located between the first and second substrates. The first substrate is a transparent substrate. Each pixel unit includes a plurality of sub-pixel units, and each sub-pixel unit includes a plurality of light-emitting units stacked in a first direction, where the first direction is the direction from the first substrate to the second substrate. The plurality of light-emitting units include first and second light-emitting units stacked in the first direction. The display panel also includes a first driving circuit and a second driving circuit. The first and second light-emitting units are respectively connected to the first and second driving circuits and emit light of different colors. The first driving circuit is located on the side of the first light-emitting unit away from the second light-emitting unit, and the second driving circuit is located on the side of the second light-emitting unit away from the first light-emitting unit. In at least one sub-pixel unit, in the first direction, the first light-emitting unit includes a first electrode, a first light-emitting layer, and a second electrode stacked sequentially. The second light-emitting unit includes a third electrode, a second light-emitting layer, and a fourth electrode stacked sequentially. The fourth electrode is a reflective electrode. One of the first, second, and third electrodes is a semi-transparent, semi-reflective electrode. A resonant cavity is formed between the reflective electrode and the semi-transparent, semi-reflective electrode. The method includes:

[0113] Step 1: Obtain control commands;

[0114] Step 2: Based on control instructions, drive at least one of the first and second light-emitting units of the sub-pixel unit to emit light.

[0115] In this embodiment, the first light-emitting unit and the second light-emitting unit are controlled independently. By driving at least one of the first light-emitting unit and the second light-emitting unit to emit light, different sub-pixel units can be lit up to achieve the display function.

[0116] For example, one of the first and second light-emitting units is a blue light-emitting unit, and the other is a yellow light-emitting unit. The pixel unit includes a red sub-pixel unit, a green sub-pixel unit, a first blue sub-pixel unit, and a white sub-pixel unit. The driving method includes:

[0117] Step 1: Obtain control commands;

[0118] Step 2: When the control command is the first control command, apply a first current signal to the blue light-emitting unit of the white sub-pixel unit and apply a second current signal to the yellow light-emitting unit of the white sub-pixel unit so that the white sub-pixel unit emits the first color light;

[0119] Step 3: When the control command is the second control command, apply a third current signal to the blue light-emitting unit of the white sub-pixel unit and apply a fourth current signal to the yellow light-emitting unit of the white sub-pixel unit so that the white sub-pixel unit emits the second color light;

[0120] Among them, the first current signal is less than the third current signal, the second current signal is greater than the fourth current signal, and the color temperature of the first color light is lower than the color temperature of the second color light.

[0121] In this embodiment, by changing the magnitude of the current signals flowing through the first and second light-emitting units respectively, the brightness of the blue and yellow sub-pixel units in the white sub-pixel unit is changed, thereby altering the color temperature of the light emitted by the white sub-pixel unit. Therefore, based on a certain control command, the color temperature of the light emitted by the white sub-pixel unit can be taken as the target color temperature. Based on this, the magnitude of the current signals flowing through the blue and yellow light-emitting units can be controlled separately, thereby freely adjusting the color temperature of the light emitted by the white sub-pixel unit. For example, the color temperature of the light emitted by the white sub-pixel unit can be made warmer or cooler than the target color temperature.

[0122] This application also provides a display device, which includes a power supply circuit and any of the aforementioned display panels, wherein the power supply circuit is used to supply power to the display panel.

[0123] For example, the display device provided in the embodiments of this application can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0124] This display device has the same effect as the aforementioned display panel, which will not be described in detail here.

[0125] It should be noted that the terminology used in the implementation section of the embodiments of this application is only for explaining the embodiments of this application and is not intended to limit the embodiments of this application. Unless otherwise defined, the technical or scientific terms used in the implementation of the embodiments of this application should have the ordinary meaning understood by a person skilled in the art to which the embodiments of this application pertain. The words "first," "second," "third," and similar terms used in the patent application specification and claims of the embodiments of this application do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, the words "a" or "an" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The words "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The directional terms mentioned in the embodiments of this application, such as "top", "bottom", "up", "down", "left" or "right", are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0126] The above are merely optional embodiments of this application and are 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 a first substrate, a second substrate, a plurality of pixel units located between the first substrate and the second substrate, a first driving circuit and a second driving circuit, wherein the first substrate is a transparent substrate; The pixel unit includes a plurality of sub-pixel units, and the sub-pixel unit includes at least a first light-emitting unit and a second light-emitting unit stacked in a first direction, wherein the first direction is the direction from the first substrate to the second substrate; The first light-emitting unit is electrically connected to the first driving circuit, and the second light-emitting unit is electrically connected to the second driving circuit. The first driving circuit is located on the side of the first light-emitting unit away from the second light-emitting unit, and the second driving circuit is located on the side of the second light-emitting unit away from the first light-emitting unit. In at least one of the sub-pixel units, in the first direction, the first light-emitting unit includes a first electrode, a first light-emitting layer and a second electrode stacked in sequence, the second light-emitting unit includes a third electrode, a second light-emitting layer and a fourth electrode stacked in sequence, the fourth electrode is a reflective electrode, one of the first electrode, the second electrode and the third electrode is a semi-transparent and semi-reflective electrode, and a resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode.

2. The display panel according to claim 1, characterized in that, In at least one of the sub-pixel units, the third electrode is the semi-transparent and semi-reflective electrode.

3. The display panel according to claim 2, characterized in that, Within the sub-pixel unit, one of the first light-emitting unit and the second light-emitting unit is a blue light-emitting unit, and the other light-emitting unit is a yellow light-emitting unit; The pixel unit includes a red sub-pixel unit, a green sub-pixel unit, and a first blue sub-pixel unit. The display panel further includes a color filter layer located on the side of the first light-emitting unit away from the second light-emitting unit. The color filter layer includes a red color resist block, a green color resist block, and a first cut-out area. The orthographic projection of the red color resist block onto the second substrate at least partially coincides with the orthographic projection of the red sub-pixel unit onto the second substrate. The orthographic projection of the green color resist block onto the second substrate at least partially coincides with the orthographic projection of the green sub-pixel unit onto the second substrate. The orthographic projection of the cut-out area onto the second substrate at least partially overlaps with the orthographic projection of the first blue sub-pixel unit onto the second substrate.

4. The display panel according to claim 3, characterized in that, Within the sub-pixel unit, the second light-emitting unit is the blue light-emitting unit, and the second electrode or the third electrode is the semi-transparent and semi-reflective electrode.

5. The display panel according to claim 3, characterized in that, The pixel unit further includes a white sub-pixel unit, in which one of the first electrode, the second electrode, and the third electrode is the semi-transparent and semi-reflective electrode.

6. The display panel according to claim 3, characterized in that, The light-emitting layer of the yellow light-emitting unit includes a stacked red light-emitting layer and a yellow light-emitting layer.

7. The display panel according to claim 3, characterized in that, The light-emitting layer of the yellow light-emitting unit comprises a mixture of red and yellow light-emitting materials.

8. The display panel according to claim 3, characterized in that, The blue light-emitting unit includes two stacked blue light-emitting layers and a charge-generating layer located between the two stacked blue light-emitting layers.

9. The display panel according to claim 3, characterized in that, The pixel unit further includes a second blue sub-pixel unit, and the color filter layer further includes a second cutout region, wherein the orthographic projection of the second cutout region on the second substrate at least partially overlaps with the orthographic projection of the second blue sub-pixel unit on the second substrate.

10. The display panel according to claim 2, characterized in that, Within the sub-pixel unit, one of the first light-emitting unit and the second light-emitting unit is a blue light-emitting unit, and the light-emitting layer of the other light-emitting unit includes a stacked red light-emitting layer and a green light-emitting layer; The pixel unit includes a red sub-pixel unit, a green sub-pixel unit, and a first blue sub-pixel unit. The display panel also includes a color filter layer, which is located away from the first light-emitting unit. On one side of the second light-emitting unit, the color filter layer includes a red color block, a green color block, and a first cut-out region. The orthographic projection of the red color block on the second substrate at least partially coincides with the orthographic projection of the red sub-pixel unit on the second substrate. The orthographic projection of the green color block on the second substrate at least partially coincides with the orthographic projection of the green sub-pixel unit on the second substrate. The orthographic projection of the first cut-out region on the second substrate at least partially coincides with the orthographic projection of the first blue sub-pixel unit on the second substrate.

11. The display panel according to any one of claims 3 to 10, characterized in that, The display panel further includes a first pixel definition layer and a second pixel definition layer; The first pixel definition layer is located on the side of the first substrate close to the first light-emitting unit. The first pixel definition layer includes a plurality of first sub-pixel openings. The orthographic projection of the plurality of first sub-pixel openings on the second substrate at least partially overlaps with the orthographic projection of the plurality of sub-pixel units on the second substrate. The second pixel definition layer is located on the side of the second substrate closer to the second light-emitting unit. The second pixel definition layer includes a plurality of second sub-pixel openings. The orthographic projection of the plurality of second sub-pixel openings on the second substrate at least partially overlaps with the orthographic projection of the plurality of sub-pixel units on the second substrate. The plurality of first sub-pixel openings are opposite to the plurality of second sub-pixel openings.

12. The display panel according to claim 11, characterized in that, The display panel further includes a first driving circuit layer and a second driving circuit layer. The first driving circuit layer is located on the side of the first substrate near the first light-emitting unit, and the first driving circuit is located within the first driving circuit layer. The second driving circuit layer is located on the side of the second substrate near the second light-emitting unit, and the second driving circuit is located within the second driving circuit layer. At least a portion of the orthographic projection of the first driving circuit onto the second substrate lies within the orthographic projection of the first sub-pixel definition layer onto the second substrate.

13. The display panel according to any one of claims 3 to 10, characterized in that, The display panel further includes a filling structure located between the first light-emitting unit and the second light-emitting unit, and connected to the first light-emitting unit and the second light-emitting unit.

14. The display panel according to claim 2, characterized in that, The sub-pixel unit further includes a third light-emitting unit, a third substrate, and a third driving circuit located between the first light-emitting unit and the second light-emitting unit. The light emitted by the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are of different colors. The third light-emitting unit is connected to the third driving circuit. In the first direction, the third light-emitting unit includes a fifth electrode, a third light-emitting layer, and a sixth electrode stacked sequentially.

15. The display panel according to any one of claims 3 to 10, 12, and 14, characterized in that, The plurality of sub-pixel units include a first target sub-pixel unit and a second target sub-pixel unit with different emission colors; In the first direction, the semi-transparent and semi-reflective electrode in the first target sub-pixel unit is located on one side of the semi-transparent and semi-reflective electrode in the second target sub-pixel unit.

16. The display panel according to any one of claims 3 to 10, 12, and 14, characterized in that, The plurality of sub-pixel units include a first target sub-pixel unit and a second target sub-pixel unit with different emission colors; The semi-transparent and semi-reflective electrode in the first target sub-pixel unit is in the same layer as the semi-transparent and semi-reflective electrode in the second target sub-pixel unit.

17. A method for manufacturing a display panel, characterized in that, The method includes: Provide a first substrate and a second substrate; A first light-emitting unit is fabricated on the first substrate, and a second light-emitting unit is fabricated on the second substrate. The first substrate and the second substrate are then connected relative to each other to obtain a display panel. Wherein, the first substrate is a transparent substrate, and the display panel includes a plurality of pixel units located between the first substrate and the second substrate, as well as a first driving circuit and a second driving circuit. The pixel unit includes a plurality of sub-pixel units, and the sub-pixel unit includes at least the first light-emitting unit and the second light-emitting unit stacked in a first direction, wherein the first direction is the direction from the first substrate to the second substrate. The first light-emitting unit is electrically connected to the first driving circuit, and the second light-emitting unit is electrically connected to the second driving circuit. The first driving circuit is located away from the first light-emitting unit and away from the second driving circuit. On one side of the light-emitting unit, the second driving circuit is located on the side of the second light-emitting unit away from the first light-emitting unit; In at least one of the sub-pixel units, in the first direction, the first light-emitting unit includes a first electrode, a first light-emitting layer and a second electrode stacked in sequence, the second light-emitting unit includes a third electrode, a second light-emitting layer and a fourth electrode stacked in sequence, the fourth electrode is a reflective electrode, one of the first electrode, the second electrode and the third electrode is a semi-transparent and semi-reflective electrode, and a resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode.

18. A driving method for a display panel, characterized in that, The driving method is used to control a display panel, which includes a first substrate, a second substrate, and a plurality of pixel units located between the first substrate and the second substrate. The first substrate is a transparent substrate. Each pixel unit includes a plurality of sub-pixel units, and each sub-pixel unit includes a plurality of light-emitting units stacked in a first direction, wherein the first direction is the direction from the first substrate to the second substrate. The plurality of light-emitting units include a first light-emitting unit and a second light-emitting unit stacked in the first direction. The display panel also includes a first driving circuit and a second driving circuit. The first light-emitting unit and the second light-emitting unit are respectively connected to the first driving circuit and the second driving circuit and emit light of different colors. The first driving circuit is located on the side of the first light-emitting unit away from the second light-emitting unit, and the second driving circuit is located on the side of the second light-emitting unit away from the first light-emitting unit. In at least one of the sub-pixel units, in the first direction, the first light-emitting unit includes a first electrode, a first light-emitting layer and a second electrode stacked sequentially, and the second light-emitting unit includes a third electrode, a second light-emitting layer and a fourth electrode stacked sequentially, wherein the fourth electrode is a reflective electrode, and one of the first electrode, the second electrode and the third electrode is a semi-transparent and semi-reflective electrode, and a resonant cavity is formed between the reflective electrode and the semi-transparent and semi-reflective electrode. The method includes: Obtain control commands; Based on the control command, at least one of the first and second light-emitting units of the sub-pixel unit is driven to emit light.

19. The driving method according to claim 18, characterized in that, One of the first and second light-emitting units is a blue light-emitting unit, and the other is a yellow light-emitting unit. The pixel unit includes a red sub-pixel unit, a green sub-pixel unit, a first blue sub-pixel unit, and a white sub-pixel unit. The driving method includes: Obtain control commands; When the control command is the first control command, a first current signal is applied to the blue light-emitting unit of the white sub-pixel unit, and a second current signal is applied to the yellow light-emitting unit of the white sub-pixel unit, so that the white sub-pixel unit emits the first color light; When the control command is the second control command, a third current signal is applied to the blue light-emitting unit of the white sub-pixel unit, and a fourth current signal is applied to the yellow light-emitting unit of the white sub-pixel unit, so that the white sub-pixel unit emits a second color light; Wherein, the first current signal is less than the third current signal, the second current signal is greater than the fourth current signal, and the color temperature of the first color light is lower than the color temperature of the second color light.

20. A display device, characterized in that, The display device includes a power supply circuit and a display panel as claimed in any one of claims 1 to 16, wherein the power supply circuit supplies power to the display panel.

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