CN121444638A

CN121444638A - Display panel, manufacturing method thereof, driving method thereof and display device

Info

Publication number: CN121444638A
Application number: CN202480001066.4A
Authority: CN
Inventors: 王琳琳; 于剑伟; 尤娟娟; 许名宏; 申永奇
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2024-05-30
Filing date: 2024-05-30
Publication date: 2026-01-30
Also published as: WO2025245776A1

Abstract

This application discloses a display panel, belonging to the field of display technology. The display panel includes a first substrate, a second substrate, a plurality of pixel units located between the first and second substrates, and a first driving circuit and a second driving circuit. Each pixel unit includes a plurality of sub-pixel units. In the direction from the first substrate to the second substrate, each sub-pixel unit includes at least a first light-emitting unit and a second light-emitting unit. In at least one sub-pixel unit, the first light-emitting unit includes a first electrode, a first light-emitting layer, and a second electrode; the second light-emitting unit includes a third electrode, a second light-emitting layer, and a fourth electrode; the fourth electrode is a reflective electrode; one of the first, second, and third electrodes is a semi-transparent, semi-reflective electrode; and a resonant cavity is formed between the reflective electrode and the semi-transparent, semi-reflective 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. This application can reduce power consumption when at least some sub-pixel units are lit.

Description

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

Technical Field

The application relates to the technical field of display, in particular to a display panel, a manufacturing method thereof, a driving method thereof and a display device.

Background

The display device has wide application scenes in life, such as electronic equipment of mobile phones, tablet computers and the like. The display panel is an important component of the display device.

In the related art, a display panel includes a substrate and a plurality of pixel units on the substrate, each of the pixel units including a plurality of sub-pixel units, each of the sub-pixel units including a first electrode, a plurality of light emitting layers, and a second electrode stacked, wherein colors of light emitted from the plurality of light emitting layers are different.

However, lighting any one of the monochrome sub-pixel units, such as the red sub-pixel unit, the green sub-pixel unit, or the blue sub-pixel unit, requires a plurality of light emitting layers to emit light at the same time, thus resulting in a large power consumption of the display panel.

Disclosure of Invention

The embodiment of the application provides a display panel, a manufacturing method, a driving method and a display device thereof, which can reduce the power consumption when at least part of sub-pixel units are lightened. The technical scheme is as follows:

In one aspect, a display panel is provided, the display panel comprises a first substrate, a second substrate, a plurality of pixel units, a first driving circuit and a second driving circuit, the pixel units are located between the first substrate and the second substrate, the first substrate is a transparent substrate, the pixel units comprise a plurality of sub-pixel units, the sub-pixel units at least comprise a first light emitting unit and a second light emitting unit which are stacked in a first direction, the first direction is a direction in which the first substrate points to the second substrate, the first light emitting unit is electrically connected with the first driving circuit, the second light emitting unit is electrically connected with the second driving circuit, the first driving circuit is located on one side, away from the second light emitting unit, of the first light emitting unit, at least one sub-pixel unit comprises a first light emitting unit and a second light emitting unit which are stacked in sequence in the first direction, the first light emitting unit comprises a first light emitting layer, a second light emitting layer, a first semi-reflecting electrode, a second semi-reflecting electrode and a second semi-reflecting electrode are sequentially stacked, and a first semi-transparent electrode are sequentially formed, and a second semi-transparent electrode are sequentially stacked, and a first semi-transparent electrode is formed, and a second semi-transparent electrode is sequentially formed between the first semi-reflecting electrode and a second semi-reflecting electrode and a first semi-reflecting electrode and a second electrode.

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

Optionally, in the sub-pixel units, one of the first light emitting unit and the second light emitting unit is a blue light emitting unit, the other light emitting unit is a yellow light emitting unit, the pixel unit comprises a red sub-pixel unit, a green sub-pixel unit and a first blue sub-pixel unit, the display panel further comprises a color film layer, the color film layer is located on one side, far away from the second light emitting unit, of the first light emitting unit, the color film layer comprises a red block, a green block and a first hollowed-out area, the orthographic projection of the red block on the second substrate is at least partially overlapped with the orthographic projection of the red sub-pixel unit on the second substrate, the orthographic projection of the green block on the second substrate is at least partially overlapped with the orthographic projection of the green sub-pixel unit on the second substrate, and the orthographic projection of the first hollowed-out area on the second substrate is at least partially overlapped with the orthographic projection of the first blue sub-pixel unit on the second substrate.

Optionally, in 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.

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

Alternatively, the light emitting layer of the yellow light emitting unit includes a red light emitting layer and a yellow light emitting layer stacked.

Optionally, the light emitting layer of the yellow light emitting unit includes a mixed red light emitting material and yellow light emitting material.

Alternatively, the blue light emitting unit includes two blue light emitting layers stacked, and a charge generating layer between the two blue light emitting layers stacked.

Optionally, the pixel unit further includes a second blue sub-pixel unit, and the color film layer further includes a second hollowed-out area, and a front projection of the second hollowed-out area on the second substrate is at least partially overlapped with a front projection of the second blue sub-pixel unit on the second substrate.

Optionally, in the sub-pixel unit, one of the first light emitting unit and the second light emitting unit is a blue light emitting unit, the light emitting layer of the other light emitting unit comprises a red light emitting layer and a green light emitting layer which are stacked, the pixel unit comprises a red sub-pixel unit, a green sub-pixel unit and a first blue sub-pixel unit, the display panel further comprises a color film layer, the color film layer is positioned on one side, far away from the second light emitting unit, of the first light emitting unit, the color film layer comprises a red block, a green block and a first hollowing area, the orthographic projection of the red block on the second substrate is at least partially overlapped with the orthographic projection of the red sub-pixel unit on the second substrate, the orthographic projection of the green block on the second substrate is at least partially overlapped with the orthographic projection of the green sub-pixel unit on the second substrate, and the orthographic projection of the first hollowing area on the second substrate is at least partially overlapped with the orthographic projection of the first blue sub-pixel unit on the second substrate.

The display panel further comprises a first pixel definition layer and a second pixel definition layer, wherein the first pixel definition layer is positioned on one side of the first substrate close to the first light-emitting unit, the first pixel definition layer comprises a plurality of first sub-pixel openings, orthographic projections of the plurality of first sub-pixel openings on the second substrate are at least partially overlapped with orthographic projections of the plurality of sub-pixel units on the second substrate, the second pixel definition layer is positioned on one side of the second substrate close to the second light-emitting unit, the second pixel definition layer comprises a plurality of second sub-pixel openings, orthographic projections of the plurality of second sub-pixel openings on the second substrate are at least partially overlapped with orthographic projections 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.

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 one surface of the first substrate close to the first light emitting unit, the first driving circuit layer is located in the first driving circuit layer, the second driving circuit layer is located on one surface of the second substrate close to the second light emitting unit, the second driving circuit layer is located in the second driving circuit layer, and at least part of the front projection of the first driving circuit on the second substrate is located in the front projection of the first sub-pixel defining layer on the second substrate.

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.

Optionally, the sub-pixel unit further includes a third light emitting unit, a third substrate and a third driving circuit, wherein the third light emitting unit, the third substrate and the third driving circuit are located between the first light emitting unit and the second light emitting unit, colors of light emitted by the first light emitting unit, the second light emitting unit and the third light emitting unit are different from each other, the third light emitting unit is connected with the third driving circuit, and the third light emitting unit includes a fifth electrode, a third light emitting layer and a sixth electrode which are sequentially stacked in the first direction.

Optionally, the plurality of sub-pixel units comprise a first target sub-pixel unit and a second target sub-pixel unit with different luminous colors, and the half-transparent and half-reflective electrode in the first target sub-pixel unit is positioned on one side of the half-transparent and half-reflective electrode in the second target sub-pixel unit in the first direction.

Optionally, the plurality of sub-pixel units comprise a first target sub-pixel unit and a second target sub-pixel unit with different luminous colors, and the semi-transparent and semi-reflective electrode in the first target sub-pixel unit and the semi-transparent and semi-reflective electrode in the second target sub-pixel unit are in the same layer.

On the other hand, the manufacturing method of the display panel comprises the steps of providing a first substrate and a second substrate, manufacturing a first light-emitting unit on the first substrate, manufacturing a second light-emitting unit on the second substrate, and enabling the first substrate and the second substrate to be connected relatively to each other to obtain the display panel, wherein the first substrate is a transparent substrate, the display panel comprises a plurality of pixel units located between the first substrate and the second substrate, a first driving circuit and a second driving circuit, the pixel units comprise a plurality of sub-pixel units, the sub-pixel units at least comprise a first light-emitting unit and a second light-emitting unit which are stacked in a first direction, the first direction is a direction of the first substrate pointing to the second substrate, the first light-emitting unit is electrically connected with the first driving circuit, the second light-emitting unit is electrically connected with the second driving circuit, the first driving circuit is located between the first substrate and the second substrate, the pixel units comprise a plurality of sub-pixel units located between the first substrate and the second substrate, the sub-pixel units comprise a first semi-reflective electrode and a second semi-reflective electrode, the first semi-reflective electrode is stacked between the first semi-reflective electrode and the second semi-reflective electrode is formed in sequence, the semi-reflective electrode is stacked between the first semi-reflective electrode and the second semi-reflective electrode is stacked in a first semi-reflective electrode, and the semi-reflective electrode is stacked in a second semi-reflective electrode is located between the first semi-reflective electrode, and the first semi-reflective electrode is stacked in the first reflective electrode is a semi-reflective electrode, and the semi-reflective electrode is transparent electrode, and the semi-reflective electrode is transparent, and the reflective electrode is transparent, and the light is transparent.

In still another aspect, a driving method of a display panel is provided, where the driving method is used for controlling the display panel, the display panel includes a first substrate, a second substrate, and a plurality of pixel units located between the first substrate and the second substrate, where the first substrate is a transparent substrate, the pixel units include a plurality of sub-pixel units, the sub-pixel units include a plurality of light emitting units stacked in a first direction, the first direction is a direction in which the first substrate points 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 further includes a first driving circuit and a second driving circuit, the first light emitting unit and the second light emitting unit are connected with a first driving circuit and a second driving circuit, respectively, and the first driving circuit is located on a side of the first light emitting unit away from the second light emitting unit, and the second driving circuit is located on a 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 comprises a first electrode, a first light emitting layer and a second electrode which are sequentially stacked, the second light emitting unit comprises a third electrode, a second light emitting layer and a fourth electrode which are sequentially stacked, wherein the fourth electrode is a reflecting electrode, 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 reflecting electrode and the semi-transparent and semi-reflective electrode, the method comprises the steps of acquiring a control instruction, at least one of the first light emitting unit and the second light emitting unit of the sub-pixel unit is driven to emit light.

Optionally, one of the first light emitting unit and the second light emitting unit is a blue light emitting unit, the other light emitting unit is a yellow light emitting unit, the pixel unit comprises 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 comprises the steps of obtaining a control instruction, applying a first current signal to the blue light emitting unit of the white sub-pixel unit and a second current signal to the yellow light emitting unit of the white sub-pixel unit when the control instruction is the first control instruction, so that the white sub-pixel unit emits first color light, applying a third current signal to the blue light emitting unit of the white sub-pixel unit when the control instruction is the second control instruction, 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 second color light, wherein the first current signal is smaller than the third current signal, and the second current signal is larger than the fourth current signal, and the color temperature of the second color temperature of the first color is lower than the color temperature of the first color.

In yet another aspect, a display device is provided, the display device including a power supply circuit and any one of the foregoing display panels, the power supply circuit supplying power to the display panels.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least the first light-emitting unit and the second light-emitting unit which are stacked in the first direction and can be independently controlled are arranged in the sub-pixel units, so that only part of the light-emitting units can be lightened in one sub-pixel unit, and the power consumption of a single sub-pixel unit is reduced. And the fourth electrode in the first light-emitting unit and the second light-emitting unit is a reflecting 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 reflecting electrode and the semi-transparent and semi-reflective electrode, so that the light-emitting efficiency of a light-emitting layer positioned between the reflecting electrode and the semi-transparent and semi-reflective electrode can be improved under the action of a microcavity effect, and the power consumption when at least part of the sub-pixel units are lightened can be reduced on the premise that the brightness of the sub-pixel units is unchanged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional structure of a display panel according to an embodiment of the present application;

fig. 2 is a schematic plan view of a display panel according to an embodiment of the present application;

FIG. 3 is a schematic plan view of a color film layer according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a sub-pixel unit according to an embodiment of the present application;

FIG. 5 is a schematic cross-sectional view of a sub-pixel unit according to an embodiment of the present application;

FIG. 6 is a schematic cross-sectional view of another display panel according to an embodiment of the present application;

FIG. 7 is a schematic plan view of another color film layer according to an embodiment of the present application;

fig. 8 is a schematic cross-sectional structure of another display panel according to an embodiment of the present application;

fig. 9 is a schematic cross-sectional structure of another display panel according to an embodiment of the present application;

fig. 10 is a schematic diagram of a flow method of a display panel according to an embodiment of the application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

In the related art, a display panel includes a substrate and a plurality of pixel units on the substrate, each of the pixel units including a plurality of sub-pixel units, each of the sub-pixel units including a stacked first electrode, a plurality of light emitting layers, and a second electrode, wherein colors of light emitted from the stacked light emitting layers are different. For example, each sub-pixel unit includes a first electrode, a red light emitting layer, a green light emitting layer, a blue light emitting layer, and a second electrode, which are stacked.

If any one of the single-color sub-pixel units is lightened, after current is introduced into the first electrode and the second electrode, the plurality of light-emitting layers emit light at the same time, for example, if the blue sub-pixel unit is lightened, the red light-emitting layer, the green light-emitting layer and the blue light-emitting layer emit light at the same time, but the light emitted by the red light-emitting layer is not beneficial to improving the brightness of the blue sub-pixel unit, and the light emitted by the green light-emitting layer is limited in improving the brightness of the blue sub-pixel unit, so that the light emitted by the red light-emitting layer and the light emitted by the green light-emitting layer can cause the larger power consumption of the blue sub-pixel unit in the display panel to lighten, and the red sub-pixel unit or the green sub-pixel unit are lightened in the same way, so that the power consumption of the display panel is larger.

In addition, the application also forms a resonant cavity by respectively arranging the reflecting electrode and the semi-transparent semi-reflecting electrode at two sides of at least one luminous layer, and the luminous efficiency of the luminous layer positioned between the reflecting electrode and the semi-transparent semi-reflecting electrode is improved under the action of microcavity effect, so that the power consumption when at least part of the sub-pixel units are lightened on the premise that the brightness of the sub-pixel units is unchanged.

Fig. 1 is a schematic cross-sectional structure of a display panel according to an embodiment of the present application, fig. 2 is a schematic plan view of a display panel according to an embodiment of the present application, and fig. 1 is a schematic cross-sectional structure of fig. 2 along an AA section line. As shown in fig. 1 and 2, the display panel includes a first substrate 1, a second substrate 2, a plurality of pixel units p 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 including at least a first light emitting unit 31 and a second light emitting unit 32 stacked in a first direction x, which is a direction in which the first substrate 1 is directed toward the second substrate 2. The first light emitting unit 31 is electrically connected to the first driving circuit 41, the second light emitting unit 32 is electrically connected to the second driving circuit 42, the first driving circuit 41 is located at a side of the first light emitting unit 31 away from the second light emitting unit 32, and the second driving circuit 42 is located at a 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 sequentially stacked, the second light emitting unit 32 includes a third electrode 321, a second light emitting layer 322, and a fourth electrode 323 sequentially stacked, the fourth electrode 323 is a reflective electrode, one of the first electrode 311, the second electrode 313, and the third electrode 321 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.

It should be noted that, in fig. 1, the first driving circuit 41 and the second driving circuit 42 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, and do not represent that a whole layer of film structure exists on the side of the first light emitting unit 31 away from the second light emitting unit 32 and is the first driving circuit 41, or that a whole layer of film exists on the side of the second light emitting unit 32 away from the first light emitting unit 31 and is the second driving circuit 42.

It should be noted that, for clarity, structures other than the pixel unit p (e.g., the first sub-pixel opening 510 and the second sub-pixel opening 520) are labeled, and thus only one pixel unit p and a portion of the sub-pixel units located within the other pixel unit p are labeled by way of example.

It should be noted that, in fig. 2, for clarity of illustration, the distribution of the sub-pixel units is not shown, and other structures above the first light emitting unit 31, such as the first substrate 1 and the first driving circuit 41, and the second driving circuit 42 are not shown.

The first substrate 1 is illustratively a transparent substrate, and the display surface of the display panel is located on a side of the first light emitting unit 31 away from the second light emitting unit 32.

By fabricating the plurality of light emitting units 30 in the first direction x to constitute the sub-pixel unit, the plurality of light emitting units 30 include the first light emitting unit 31 and the second light emitting unit 32, and 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 independently controlled, so that only part of the light emitting units can be lighted in one sub-pixel unit, for example, in one single color sub-pixel unit, to reduce power consumption when a single sub-pixel unit is lighted.

In one possible embodiment, as shown in fig. 1 and 2, one of the first and second light emitting units 31 and 32 is a blue light emitting unit and the other is a yellow light emitting unit, and the pixel unit includes a red sub-pixel unit p1, a green sub-pixel unit p2, and a first blue sub-pixel unit p3. The first blue sub-pixel unit p3 is required to be supplied with current only to the blue light emitting unit and not to the yellow light emitting unit, so that the power consumption of the first blue sub-pixel unit p3 when it is turned on can be reduced, and the red sub-pixel unit p1 or the green sub-pixel unit p2 is required to be supplied with current only to the yellow light emitting unit and not to the blue light emitting unit, so that the power consumption of the red sub-pixel unit p1 and the yellow sub-pixel unit p2 when it is turned on can be reduced.

That is, in the related art, current is required to be applied to all the light emitting layers stacked and connected in series in one sub-pixel unit to light up the one sub-pixel unit, but for a single-color sub-pixel unit, light emitted by a part of the light emitting layers is not beneficial to improving the brightness of the single-color sub-pixel unit or has limited brightness improvement for the single-color sub-pixel unit, and power consumption for lighting up the part of the light emitting layers is large. The sub-pixel unit in the application at least comprises the first light emitting unit 31 and the second light emitting unit 32 which are stacked and can be controlled independently, so that only the light emitting unit 30 with favorable brightness enhancement of the sub-pixel unit is lightened in the sub-pixel unit, and the light emitting unit 30 with unfavorable brightness enhancement or limited brightness enhancement of the sub-pixel unit is not lightened, thereby reducing the power consumption when a single sub-pixel unit is lightened, and particularly reducing the power consumption when a single-color sub-pixel unit is lightened.

In addition, since the fourth electrode 323 is a reflective electrode, one of the first electrode 311, the second electrode 312 and the third electrode 321 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, so that under the effect of the microcavity effect, the spectrum of light in the resonant cavity has a relatively wide and short peak, and the spectrum of light emitted from the resonant cavity has a relatively narrow and high peak, and since the spectrum of light emitted from the resonant cavity has a relatively high peak, the arrangement of the reflective electrode and the semi-transparent and semi-reflective electrode can improve the luminous efficiency of the luminous layer between the reflective electrode and the semi-transparent and semi-reflective electrode, thereby reducing the power consumption when at least a part of the sub-pixel units are lighted on the premise that the brightness of the sub-pixel units is unchanged. For example, if the sub-pixel unit is a white sub-pixel unit, the first light-emitting unit and the second light-emitting unit can be both white light-emitting units, at least one white light-emitting layer is positioned between the reflecting electrode and the semi-transparent semi-reflective electrode, and the light-emitting efficiency of the white light-emitting layer positioned between the reflecting electrode and the semi-transparent semi-reflective electrode is improved under the action of microcavity effect, so that the power consumption of the white sub-pixel unit when the white sub-pixel unit is lighted is reduced on the premise that the brightness of the white sub-pixel unit is unchanged. Therefore, the arrangement of the first light emitting unit and the second light emitting unit, and the semi-reflective electrode and the reflective electrode, which are independently controlled, can play a role in reducing the power consumption when the sub-pixel unit is lighted, whether for the monochrome sub-pixel unit or the white sub-pixel unit.

In addition, in the related art, since the sub-pixel unit includes a plurality of stacked light emitting layers, a charge generating layer (CHARGE GENERATE LAYER, CGL) is generally required to be disposed between every two adjacent light emitting layers, so as to provide carriers for the light emitting layers located on two sides of the CGL layer, and improve charge injection efficiency, thereby improving light extraction efficiency. However, since CGL has a low concentration and is active and easily oxidized metal element, such as lithium element, and is often manufactured by co-evaporation of the metal element and the material of the electron transport layer (Electron Transport Layer, ETL) in the light-emitting layer, uniformity of distribution of the metal element is difficult to control, and thus, the process for manufacturing CGL is difficult. In the embodiment of the application, the sub-pixel unit comprises a plurality of laminated light emitting units, so that the CGL can be manufactured without or less, and the manufacturing process difficulty of the display panel is reduced.

In summary, in the display panel provided by the embodiment of the application, the first light emitting unit and the second light emitting unit which are stacked in the first direction and can be independently controlled are arranged in the sub-pixel unit, so that only part of the light emitting units can be lightened in one sub-pixel unit, and the power consumption of a single sub-pixel unit is reduced. And the fourth electrode is a reflecting 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 reflecting electrode and the semi-transparent and semi-reflective electrode, so that the luminous efficiency of a luminous layer positioned between the reflecting electrode and the semi-transparent and semi-reflective electrode can be improved under the action of a microcavity effect, and the power consumption when at least part of the sub-pixel units are lightened can be reduced on the premise that the brightness of the sub-pixel units is unchanged. In addition, the embodiment of the application can not manufacture or rarely manufacture the CGL between the two adjacent laminated light-emitting layers, thereby reducing the manufacturing process difficulty of the display panel.

In one possible embodiment, the third electrode 321 is a half-transmissive electrode in at least one sub-pixel unit. Since the third electrode 321 is a half-transparent and half-reflective electrode, the brightness of the light emitted from the second light emitting unit 32 can be improved, and therefore, for the second light emitting unit 32 having the half-transparent and half-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 turned on, the third electrode 321 is a half-transparent and half-reflective electrode, that is, on the premise that the brightness of the sub-pixel unit is unchanged, the third electrode 321 is a half-transparent and half-reflective electrode, so that the power consumption when the sub-pixel unit is turned on can be reduced. In addition, since the third electrode 321 is closest to the fourth electrode 323, which is the reflective electrode, among the first electrode 311, the second electrode 313, and the third electrode 321, the third electrode 321 is a half-reflective electrode, so that the light emitting efficiency of the light emitting layer between the half-reflective electrode and the reflective electrode is improved in the resonant cavity formed between the half-reflective electrode and the reflective electrode due to the microcavity effect, and the possibility that the light emitting efficiency of the light emitting layer between the half-reflective electrode and the reflective electrode is improved due to too much film between the reflective electrode and the half-reflective electrode due to too much distance between the half-reflective electrode and the reflective electrode is not high is reduced, for example, the display panel further includes the first encapsulation layer on the side of the first light emitting unit 31 close to the second light emitting unit 32, and the third electrode 321 is a half-reflective electrode, so that the possibility that the resonant cavity is affected by the first encapsulation layer is reduced.

In other possible embodiments, in at least one sub-pixel unit, the second electrode 313 may be a half-transparent half-reflective electrode to enhance the brightness of the light emitted by the second light emitting unit 32, so for the first light emitting unit 31 having the half-transparent half-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 turned on, the second electrode 313 is set to the half-transparent half-reflective electrode to enhance the brightness of the sub-pixel unit, that is, if the brightness of the sub-pixel unit is unchanged, the second electrode 313 is set to the half-transparent half-reflective electrode to reduce the power consumption when the sub-pixel unit is turned on.

In other possible embodiments, in at least one sub-pixel unit, the first electrode 311 may be set as a half-transparent half-reflective electrode to increase the brightness of the light emitted by at least one of the first light emitting unit 31 and the second light emitting unit 32, so for the first light emitting unit 32 having the half-transparent half-reflective electrode and the sub-pixel unit where the first light emitting unit 32 is located, if at least one of the first light emitting unit 31 and the second light emitting unit 32 emits light when the sub-pixel unit is turned on, the first electrode 311 is set as the half-transparent half-reflective electrode to increase the brightness of the sub-pixel unit, that is, if the brightness of the sub-pixel unit is unchanged, the first electrode 311 is set as the half-transparent half-reflective electrode to reduce the power consumption when the sub-pixel unit is turned on.

Illustratively, the fourth electrode 323, i.e., the reflective electrode, is made of a material including one or more of metallic materials, such as silver, aluminum, and the like.

Illustratively, one of the first electrode 311, the second electrode 313, and the third electrode 321 is a semi-transparent and semi-reflective electrode, and the other two electrodes are transparent electrodes. The material for manufacturing the semi-transparent and semi-reflective electrode comprises magnesium-silver alloy, magnesium-molybdenum alloy and the like, and the material for manufacturing the transparent electrode comprises Indium Tin Oxide (ITO), indium zinc oxide (Indium Zinc Oxide, IZO) and the like.

In one possible embodiment, the plurality of sub-pixel units includes a first target sub-pixel unit and a second target sub-pixel unit having different emission colors, and the transflective electrode in the first target sub-pixel unit is in the same layer as the transflective electrode in the second target sub-pixel unit. Namely, the first electrode 311 is a half-transparent half-reflective electrode in the first target sub-pixel unit and the second target sub-pixel unit, or the second electrode 313 is a half-transparent half-reflective electrode in the first target sub-pixel unit and the second target sub-pixel unit, or the third electrode 321 is a half-transparent half-reflective electrode in the first target sub-pixel unit and the second target sub-pixel unit. The semi-transparent semi-reflective electrode is arranged on the same layer, the process can be saved and the cost can be reduced.

In another possible embodiment, the plurality of sub-pixel units includes a first target sub-pixel unit and a second target sub-pixel unit having different emission colors, and the half-mirror electrode in the first target sub-pixel unit is located at one side of the half-mirror electrode in the second target sub-pixel unit, that is, the half-mirror electrode in the first target sub-pixel unit is different from the half-mirror electrode in the second target sub-pixel unit in the first direction x. For example, in the first target sub-pixel unit, the first electrode 311 is a half-mirror electrode, in the second target sub-pixel unit, the second electrode 313 or the third electrode 321 is a half-mirror electrode, or in the first target sub-pixel unit, the second electrode 313 is a half-mirror electrode, in the second target sub-pixel unit, the first electrode 311 or the third electrode 321 is a half-mirror electrode, or in the first target sub-pixel unit, the third electrode 321 is a half-mirror electrode, and in the second target sub-pixel unit, the first electrode 311 or the second electrode 313 is a half-mirror electrode. The different electrodes may be selected to be semi-transparent and semi-reflective electrodes according to the emission colors of the sub-pixel units, so as to increase the brightness of the second light emitting unit 32, or to increase the brightness of the first light emitting unit 31 and the second light emitting unit 32 at the same time.

Fig. 3 is a schematic plan view of a color film layer according to an embodiment of the present application. In one possible embodiment, as described above, as shown in fig. 1,2 and 3, one of the first and second light emitting units 31 and 32 is a blue light emitting unit and the other is a yellow light emitting unit, and the pixel unit includes a red sub-pixel unit p1, a green sub-pixel unit p2 and a first blue sub-pixel unit p3. In addition, as shown in fig. 1 and 3, the display panel further includes a color film layer 5, where the color film layer 5 is located on a side of the first light emitting unit 31 away from the second light emitting unit 32, the color film layer 5 includes a red block 51, a green block 52, and a first hollowed-out area 53, the orthographic projection of the red 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 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 hollowed-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. Since the luminance of the blue sub-pixel unit is low due to the low light emitting efficiency of the blue light in the related art, in the embodiment of the present application, if the plurality of light emitting units 30 in one sub-pixel unit include the first light emitting unit 31 and the second light emitting unit 32 stacked as shown in fig. 1, one of the light emitting units may be set as a blue light emitting unit, and the first hollowed-out area 53 is disposed above the blue sub-pixel unit p3, so that when the first blue sub-pixel unit p3 is lighted, the yellow unit in the first blue sub-pixel unit p3 does not emit light, and the blue light emitting unit emits light through the first hollowed-out area 53, i.e., the light emitted by the blue light emitting unit may directly emit through the color block, so that the luminance of the first blue sub-pixel unit p3 may be improved, i.e., the luminance of the display panel when the blue light is emitted may be improved. In this embodiment, when the red sub-pixel unit p1 is lighted, 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 block 51, and when the green sub-pixel unit p2 is lighted, the blue light emitting unit in the green sub-pixel unit p2 does not emit light, and the yellow light emitting unit emits light and the emitted light is emitted through the green block 52.

As shown in fig. 1 and 3, the color film layer 5 further includes a black matrix 55, where the black matrix 55 is located between two adjacent color blocks, between two adjacent hollowed-out areas, and between two adjacent color blocks and hollowed-out areas, and the black matrix 55 may play a role in preventing light leakage.

It should be noted that, for clarity of other structures in fig. 1 and 3, the black matrix 55 in fig. 1 and 3 is not filled with a pattern, and for clarity of the relative positional relationship between each structure and the sub-pixel unit in the color film layer 5 in fig. 3, the positions of the sub-pixel units are illustrated by dashed lines.

In other possible embodiments, as shown in fig. 1, in the sub-pixel unit, one of the first and second light emitting units 31 and 32 is a blue light emitting unit, and the light emitting layer of the other light emitting unit includes a red light emitting layer and a green light emitting layer stacked. The pixel unit p includes a red sub-pixel unit p1, a green sub-pixel unit p2, and a first blue sub-pixel unit p3. In addition, the display panel further includes a color film layer 5, where the color film layer 5 is located on a side of the first light emitting unit 31 away from the second light emitting unit 32, and the color film layer 5 includes a red block 51, a green block 52, and a first hollowed-out area 53, where the orthographic projection of the red 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, where the orthographic projection of the green 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 where the orthographic projection of the first hollowed-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 foregoing embodiment, among the first light emitting unit 31 and the second light emitting unit 32, another light emitting unit other than the blue light emitting unit may be a light emitting unit in which a light emitting layer includes a red light emitting layer and a green light emitting layer stacked, instead of the yellow light emitting unit. In this embodiment, when the red sub-pixel unit p1 is turned on, the blue light emitting unit in the red sub-pixel unit p1 does not emit light, the other light emitting unit emits red light and green light and emits the emitted light through the red block 51, when the green sub-pixel unit p2 is turned on, the blue light emitting unit in the green sub-pixel unit p2 does not emit light, the other light emitting unit emits red light and green light and emits the emitted light through the green block 52, when the first blue sub-pixel unit p3 is turned on, only the blue light emitting unit in the first blue sub-pixel unit p3 emits light, and the emitted light emits through the first hollowed-out area 53, i.e., the light emitted by the blue light emitting unit does not need to directly emit through the color block, so that the brightness of the first blue sub-pixel unit p3 can be improved, i.e., the brightness of the display panel when the blue light is emitted.

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 light emitting unit may be a cyan light emitting unit or a blue-green light emitting unit. In the embodiment, when the red sub-pixel unit is lighted, the blue-green light-emitting unit in the red sub-pixel unit does not emit light, and the red light-emitting unit emits light and can directly emit light without passing through the color block, when the green sub-pixel unit is lighted, the red light-emitting unit in the green sub-pixel unit does not emit light, and the blue sub-pixel unit emits light and needs to emit light through the green block, and when the blue sub-pixel unit is lighted, the red light-emitting unit in the blue sub-pixel unit does not emit light, and the blue-green light-emitting unit emits light and needs to emit light through the blue block.

In one possible embodiment, as shown in fig. 1, in 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 half-transmissive half-reflective electrode. The light emitting layer between the reflective electrode and the transflective electrode has only a blue light emitting layer located in the second light emitting unit 32, so that the brightness of the first blue sub-pixel unit p3 is further improved under the micro-cavity effect, i.e., the brightness of the display panel when emitting blue light is further improved. In other possible embodiments, within the sub-pixel unit, the first light emitting unit 31 may be a blue light emitting unit, and the second light emitting unit 32 may be a yellow light emitting unit.

Fig. 4 is a schematic cross-sectional structure of a sub-pixel unit according to an embodiment of the present application. In the embodiment shown in part (a) of fig. 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, and in the embodiment shown in part (b) of fig. 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.

Illustratively, as shown in parts (a) and (b) of fig. 4, the display panel further includes a first encapsulation layer 81 and a second encapsulation layer 82, where the first encapsulation layer 81 is located on a side of the first light emitting unit 31 close to the second light emitting unit 32, and the second encapsulation layer 82 is located on a side of the second light emitting unit 32 close to 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 water vapor to affect 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 being affected by water absorption to affect the display function of the display panel. Optionally, the first encapsulation layer 81 and the second encapsulation layer 82 are made of inorganic encapsulation materials.

In one possible embodiment, referring again to fig. 1, 2 and 3, the pixel unit p further includes a white sub-pixel unit p4, and one of the first electrode 311, the second electrode 313 and the third electrode 321 is a half-transmissive half-reflective electrode within the white sub-pixel unit p 4. The white sub-pixel unit p4 can increase the brightness of the display panel, and when the white sub-pixel unit p4 is turned on, both the first light emitting unit 31 and the second light emitting unit 32 emit light, so that the brightness of the light emitted from the first light emitting unit 31 and the brightness of the light emitted from the second light emitting unit 32 can be increased simultaneously if the first electrode 311 is a half-transmissive electrode in the white sub-pixel unit p4, and the brightness of the light emitted from the second light emitting unit 32 can be increased if the second electrode 313 or the third electrode 321 is a half-transmissive electrode. Therefore, compared with the first electrode 311, the second electrode 313 and the third electrode 321 in the white sub-pixel unit p4 being transparent electrodes, one of the first electrode 311, the second electrode 313 and the third electrode 321 is a half-transparent and half-reflective electrode, so that the brightness of the white sub-pixel unit p4 can be improved.

As shown in fig. 1 and 3, the color film layer further includes a hollowed-out area 54 corresponding to the white sub-pixel unit p4, and in the embodiment of the application, the hollowed-out area 54 corresponding to the white sub-pixel unit p4 is also referred to as a third hollowed-out area 54. The front projection of the third hollowed-out area 54 on the second substrate 2 is at least partially overlapped with the front projection of the white sub-pixel unit p4 on the second substrate 2, so that 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 hollowed-out area 54, that is, the first light emitting unit 31 and the second light emitting unit 32 can be directly emitted without passing through a color block, thereby improving the brightness of the white sub-pixel unit p4 and improving the brightness of the display panel.

In one possible embodiment, the light emitting layer of the yellow light emitting unit includes a red light emitting layer and a yellow light emitting layer, and if the yellow light emitting unit emits only 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 blocking piece 51 is low, so that the yellow light emitting unit emits red light and yellow light at the same time, and the brightness of the red sub-pixel unit p1 can be improved. Optionally, the yellow light emitting unit further includes a CGL disposed between the red light emitting layer and the yellow light emitting layer, so as to provide carriers for the red light emitting layer and the yellow light emitting layer disposed at both sides of the CGL layer, and improve charge injection efficiency, thereby improving light emitting efficiency and brightness of red light and yellow light emitted from the yellow light emitting unit.

In another possible embodiment, the light emitting layer of the yellow light emitting unit includes a mixed red light emitting material and yellow light emitting material to enhance the brightness of the red sub-pixel unit p 1. The mixed red light-emitting material and yellow light-emitting material can be used to produce a light-emitting layer forming a yellow light-emitting unit by, for example, co-evaporation, and the production process is simpler than the process of producing a laminated red light-emitting layer and yellow light-emitting layer.

The inventor compares the power consumption of the display panel in the related art when the display panel emits light of different colors with the power consumption of the display panel in the embodiment of the application, and the comparison result is shown in a table one, which is a comparison table of the power consumption of the display panel in the related art when the display panel emits light of different colors with the power consumption of the display panel in the embodiment of the application.

Table A comparison Table of the results of the power consumption of the display panel in the related art when the display panel emits light of different colors and the power consumption of the display panel in the embodiment of the application

As shown in table one, the data in the column of Ref is the power consumption of the display panel when all red sub-pixel units are lit, the power consumption of the display panel when all green sub-pixel units are lit, and the power consumption of the display panel when all white sub-pixel units are lit in the display panel in the related art, and the data in the column of the display panel a is the power consumption of the display panel when all red sub-pixel units are lit, the power consumption of the display panel when all green sub-pixel units are lit, and the power consumption of the display panel when all white sub-pixel units are lit in the display panel a in the embodiment of the application. The data of the rows where the red (power consumption/watt) is located refers to that the power consumption of the display panel in the related art and the power consumption of the display panel in the embodiment of the present application are measured and calculated respectively on the premise that the red brightness is the same, and the data of the rows where the green and the white are located are the same, which is not repeated here. In the related art, one 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 between the reflective electrode and the transparent electrode. In the display panel a, the second electrode 313 is a half-transparent and half-reflective electrode, the first electrode 311 and the third electrode 321 are 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 one, it can be seen that the display panel in the embodiment of the application has reduced power consumption when emitting red light, green light and white light, compared with the display panel in the related art, on the premise that the brightness corresponding to the light emitting color is the same.

In a possible embodiment, the blue light emitting unit comprises only one blue light emitting layer. In other possible embodiments, the blue light emitting unit includes two blue light emitting layers stacked, and a CGL located between the two blue light emitting layers stacked. The two blue light emitting layers and the CGL positioned between the two blue light emitting layers are arranged in the blue light emitting unit, so that the brightness of light emitted by the blue light emitting unit can be improved, the brightness of the first blue sub-pixel unit p3 is further improved, namely, the brightness of the display panel when the display panel emits blue light is further improved, and the brightness of the white sub-pixel unit p4 is further improved.

Fig. 5 is a schematic cross-sectional structure of a sub-pixel unit according to an embodiment of the present application. In the embodiment shown in part (a) of fig. 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 blue light emitting layers stacked, and in the embodiment shown in part (b) of fig. 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 blue light emitting layers stacked.

The inventor compares the power consumption of the display panel in the related art when the display panel emits light of different colors with the power consumption of the display panel in the embodiment of the application, and the comparison result is shown in a second table, which is a comparison table of the power consumption of the display panel in the related art when the display panel emits light of different colors with the power consumption of the display panel in the embodiment of the application.

As shown in table two, the data of the column where Ref is located is the power consumption of the display panel when all red sub-pixel units are lit, the power consumption of the display panel when all green sub-pixel units are lit, the power consumption of the display panel when all blue sub-pixel units are lit, and the power consumption of the display panel when all white sub-pixel units are lit in the display panel B in the embodiment of the application, the data of the column where Ref is located is the power consumption of the display panel when all red sub-pixel units are lit, the power consumption of the display panel when all green sub-pixel units are lit, the power consumption of the display panel when all blue sub-pixel units are lit, and the power consumption of the display panel when all white sub-pixel units are lit. The data of the rows where red (power consumption/watt) is located refers to that the power consumption of the display panel in the related art and the power consumption of the display panel in the embodiment of the present application are measured and calculated respectively on the premise that the red brightness is the same, and the data of the rows where green, blue and white are located are the same, which is not described herein again. In the related art, one 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 sequentially stacked between the reflective electrode and the transparent electrode. In the display panel B, the second electrode 313 is a half-transmissive electrode, the first electrode 311 and the third electrode 321 are transparent electrodes, the first light emitting unit is a blue light emitting unit including two blue light emitting layers stacked, and the second light emitting unit is a yellow light emitting unit. As shown in table two, it can be seen that the display panel in the embodiment of the application has reduced power consumption when emitting red light, green light, blue light and white light, compared with the display panel in the related art, on the premise that the brightness corresponding to the light emission color is the same.

Table II results of comparing the power consumption of the display panel in the related art when it emits light of different colors with the power consumption of the display panel in the embodiment of the present application

In an embodiment of the present application, referring again to fig. 1, the display panel further includes a first pixel definition layer 51 and a second pixel definition layer 52. The first pixel defining layer 51 is located on a side of the first substrate 1 close to the first light emitting unit 31, and the first pixel defining layer 51 includes a plurality of first sub-pixel openings 510, where the front projections of the plurality of first sub-pixel openings 510 on the second substrate 2 at least partially coincide with the front projections of the plurality of sub-pixel units on the second substrate 2. The second pixel defining layer 52 is located on a side of the second substrate 2 near the second light emitting unit 32, and the second pixel defining layer 52 includes a plurality of second sub-pixel openings 520, where the front projections of the plurality of second sub-pixel openings 520 on the second substrate 2 at least partially coincide with the front projections of the plurality of sub-pixel units on the second substrate 2, and the plurality of first sub-pixel openings 510 are opposite to the plurality of second sub-pixel openings 520. The first sub-pixel defining layer 51 and the second sub-pixel defining layer 52 may play a role of preventing crosstalk of light of different sub-pixel units, and in a manufacturing process of the display panel, the first sub-pixel defining layer 51 and the second sub-pixel defining layer 52 may be formed on the first substrate 1 and the second substrate 2, respectively, and then light emitting layers or electrodes in a plurality of sub-pixel units may be simultaneously manufactured on the first sub-pixel defining layer 51 by using, for example, an Open Mask (OM), which is relatively simple, and a material of the light emitting layer or a material of the electrode may not only enter into the sub-pixel openings but also cover the portion of the first sub-pixel defining layer 51 located between two adjacent first sub-pixel openings 510 in the manufacturing process. The portion of the first sub-pixel defining layer 51 located between two adjacent first sub-pixel openings 510 may function to block the light emitting layer material or the electrode material located in different sub-pixel units, thereby avoiding connection between the light emitting layer materials of different sub-pixel units and avoiding connection of the electrode materials of different sub-pixel units, and thus avoiding affecting the display effect of the display panel. The second sub-pixel defining layer 52 is similar, and the portion of the second sub-pixel defining layer 52 located between two adjacent second sub-pixel openings 520 may function to block the light emitting layer material or the electrode material located in different sub-pixel units, thereby avoiding connection between the light emitting layer materials of different sub-pixel units and avoiding connection between the electrode materials of different sub-pixel units, and thus avoiding affecting the display effect of the display panel.

Optionally, for a portion of the first sub-pixel defining layer 51 located between two adjacent first sub-pixel openings 510 and a portion of the second sub-pixel defining layer 52 located between two adjacent second sub-pixel openings 520, the display panel has a luminescent material and an electrode material between the first sub-pixel defining layer 51 and the second sub-pixel defining layer, which are not electrically connected to the luminescent layer and the electrode within the sub-pixel unit.

In a possible embodiment, as shown in fig. 1, the display panel further comprises a filling structure 6, the filling structure 6 being located between the first light emitting unit 31 and the second light emitting unit 32 and being connected to the first light emitting unit 31 and the second light emitting unit 32. When the first light emitting units 31 on the first substrate 1 and the second light emitting units 32 on the second substrate 2 are aligned, the filling structure 6 may be further added between the first light emitting units 31 and the second light emitting units, so as to further improve the packaging effect of the display panel. Illustratively, the filling structure 6 is made of a transparent organic encapsulation material, such as an epoxy resin material, so as to fill the first plurality of sub-pixel openings 510 and the second plurality of sub-pixel openings 520 well, thereby being connected to the plurality of light emitting units 31 and the plurality of second light emitting units 32.

In other possible embodiments, the display panel does not include the filling structure 6, and air is disposed between the plurality of first light emitting units 31 and the plurality of second light emitting units 32, so as to reduce the loss of light emitted by the first light emitting units 31 and the loss of light emitted by the second light emitting units 32 as much as possible, for example, in the process of emitting light emitted by the first light emitting units 31 to the direction close to the first substrate 1 after reaching the reflective electrode, i.e., the fourth electrode 323, the loss of light emitted by the first light emitting units 31 is reduced, and in the process of emitting light emitted by the second light emitting units 32 to the direction close to the first substrate 1, the loss of light emitted by the second light emitting units 32 is reduced, so as to further improve the brightness of the sub-pixel units, or reduce the power consumption of the display panel on the premise that the brightness of the sub-pixel units is unchanged.

Fig. 6 is a schematic cross-sectional structure of another display panel according to an embodiment of the present application, and fig. 7 is a schematic plan view of another color film layer according to an embodiment of the present application. In contrast to the embodiments shown in fig. 1 and 3, in the embodiments shown in fig. 6 and 7, the pixel cell p does not include the white sub-pixel cell p4, but the pixel cell p further includes the second blue sub-pixel cell p5. As shown in fig. 6 and 7, the color film layer 5 further includes a second hollowed-out area 56, and the orthographic projection of the second hollowed-out area 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, namely a first blue sub-pixel unit p3 and a second blue sub-pixel unit p5, are arranged in one pixel unit p, and light emitted by a blue light-emitting unit in the second blue sub-pixel unit p5 is emitted through a second hollowed-out area 56, namely 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 directly emitted without passing through a color block, so that the brightness of the display panel when blue light is emitted is further improved.

It should be noted that, for clarity of other structures in fig. 6 and 7, the black matrix 55 in fig. 6 and 7 is not filled with a pattern, and for clarity of the relative positional relationship between each structure and the sub-pixel unit in the color film layer 5 in fig. 7, the positions of the sub-pixel units are illustrated by dashed lines.

Fig. 8 is a schematic cross-sectional structure of another display panel according to an embodiment of the application. As shown in fig. 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 a surface of the first substrate 1 adjacent to the first light emitting unit 31, the first driving circuit 41 (not shown in fig. 8) is located in the first driving circuit layer 410, the second driving circuit layer 420 is located on a surface of the second substrate 2 adjacent to the second light emitting unit 32, and the second driving circuit 42 (not shown in fig. 8) is located in the second driving circuit layer 420. At least part of the front projection of the first driving circuit 41 on the second substrate 2 is located in the front projection of the first sub-pixel defining layer 51 on the second substrate 2, i.e. the first driving circuit is arranged right above the first sub-pixel defining layer 51 as much as possible, so that the influence of metal routing in the first driving circuit 41 on the light emission of the sub-pixel unit is reduced as much as possible.

The respective film layer structures in the first and second driving circuit layers of the display panel are exemplarily described below. As shown in fig. 8, 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.

Illustratively, as shown in fig. 8, the third planarization layer 4216 includes a plurality of vias thereon so that the second electrode 323 of the second light emitting unit 32 is connected to the third source-drain layer 4215 in the second driving circuit layer 420 through the vias.

Illustratively, the second driving circuit 42 includes a plurality of traces, such as a plurality of metal traces, 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.

In the embodiment of the present application, the second substrate 2 may be a hard substrate or a flexible substrate, such as a glass substrate, a quartz substrate, a plastic substrate, etc. The second substrate 2 may be a single-layer or multi-layer structure. Taking a multilayer structure as an example, the second substrate 2 includes a first polyimide layer, a first protection layer, a second polyimide layer and a second protection layer which are sequentially stacked from bottom to top, where the two protection layers are used for protecting the polyimide layer and preventing the polyimide layer from being damaged by a subsequent process. The second substrate 2 is also covered with a buffer layer, which can block water and oxygen and block alkaline ions.

Illustratively, the fabrication material of the first active layer 4201 includes a low temperature polysilicon material, and the fabrication material of the second active layer 4207 includes a metal oxide semiconductor material such as indium gallium zinc oxide (Indium Gallium Zinc Oxide, IGZO).

Illustratively, the materials of fabrication of 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 at least one of silicon oxide, silicon nitride, and silicon oxynitride.

Illustratively, the fabrication materials of first gate layer 4203, second gate layer 4205, and third gate layer 4209 include metallic materials, such as one or more of molybdenum, copper, aluminum.

Illustratively, the materials of construction of the first, second, and third planarization layers 4212, 4214, 4216 comprise an organic insulating material, such as a resin, or the like.

Illustratively, the first, second, and third source-drain layers 4211, 4213, and 4215 comprise a plurality of layers of metals stacked in sequence. For example, the third source-drain layer 4215 may include a molybdenum layer, an aluminum layer, and a molybdenum layer stacked in this order, or include a titanium layer, an aluminum layer, and a titanium layer stacked in this order.

Illustratively, 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 sequentially stacked on the first substrate 1. The material of each film structure in the first driving circuit layer 410 refers to the material of each film structure in the second driving circuit layer 410, and will not be described herein. Illustratively, the first driving circuit 41 includes a plurality of traces, such as a plurality of metal traces, 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.

In the foregoing embodiments, the display panels each include the first substrate 1, the second substrate 2, the plurality of first light emitting units 31 on the first substrate 1, and the plurality of second light emitting units on the second substrate 2. Fig. 9 is a schematic cross-sectional structure of another display panel according to an embodiment of the application. In other possible embodiments, as shown in fig. 9. The sub-pixel unit further includes a third light emitting unit 33, a third substrate 7, and a third driving circuit 43 between the first light emitting unit 31 and the second light emitting unit 32, colors of light emitted from 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, which are sequentially stacked. In the first direction x, three light emitting units may be provided, and it is known from the foregoing that the first light emitting unit 31 and the second light emitting unit 32 are independently controllable, and 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 are each independently controllable. Therefore, only one of the light emitting units may be individually controlled to emit light among the different sub-pixel units, thereby reducing power consumption of the monochrome sub-pixel unit. The first, second and third light emitting units 31, 32 and 33 may be a red, green and blue light emitting unit, so that only the red light emitting unit may be controlled to emit light when the red sub-pixel unit is lighted to reduce power consumption when the red sub-pixel unit is lighted, and the green or blue sub-pixel unit is lighted similarly, which is not repeated herein.

In one possible embodiment, as shown in fig. 9, the third substrate 7 is located at a side of the third light emitting unit 33 remote 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.

Note that, in fig. 9, the third driving circuit 43 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 a whole layer of film exists on the side of the third light emitting unit 31 away from the first light emitting unit 31, and the film structure is the third driving circuit 43.

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

Fig. 10 is a schematic diagram of a flow method of a display panel according to an embodiment of the application. As shown in fig. 8, the method includes:

step 1001 provides a first substrate and a second substrate.

Step 1002, manufacturing a plurality of light emitting units on a first substrate and a second substrate respectively, and connecting the first substrate and the second substrate relatively to obtain the display panel.

The display panel comprises a plurality of pixel units, a first driving circuit and a second driving circuit, wherein the pixel units are arranged between the first substrate and the second substrate, the pixel units comprise a plurality of sub-pixel units, the sub-pixel units comprise a plurality of light emitting units which are stacked in a first direction, the first direction is the direction that the first substrate points to the second substrate, and the light emitting units comprise a first light emitting unit and a second light emitting unit which are stacked in the first direction. The first light-emitting unit and the second light-emitting unit are respectively connected with the first driving circuit and the second driving circuit, the colors of emitted light are different, the first driving circuit is located at one side of the first light-emitting unit away from the second light-emitting unit, and the second driving circuit is located at one side of the second light-emitting unit away from the first light-emitting unit. In at least one sub-pixel unit, in a first direction, the first light emitting unit comprises a first electrode, a first light emitting layer and a second electrode which are sequentially stacked, the second light emitting unit comprises a third electrode, a second light emitting layer and a fourth electrode which are sequentially stacked, wherein the fourth electrode is a reflecting 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 reflecting electrode and the semi-transparent and semi-reflective electrode.

In summary, the method for manufacturing a display panel according to the embodiment of the present application manufactures a display panel including a plurality of pixel units, where each pixel unit includes a plurality of sub-pixel units, and the first light emitting unit and the second light emitting unit that are stacked in the first direction and can be independently controlled are disposed in each sub-pixel unit, so that only a portion of the light emitting units can be turned on in one sub-pixel unit, and power consumption of a single sub-pixel unit is reduced. And the fourth electrode is a reflecting 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 reflecting electrode and the semi-transparent and semi-reflective electrode, so that the luminous efficiency of a luminous layer positioned between the reflecting electrode and the semi-transparent and semi-reflective electrode can be improved under the action of a microcavity effect, and the power consumption when at least part of the sub-pixel units are lightened can be reduced on the premise that the brightness of the sub-pixel units is unchanged. In addition, the embodiment of the application can not manufacture or rarely manufacture the CGL between the two adjacent laminated light-emitting layers, thereby reducing the manufacturing process difficulty of the display panel

Illustratively, the light emitting layers in the plurality of sub-pixels are fabricated simultaneously by using an Open Mask (OM) and by means of, for example, evaporation.

By using an Open Mask (OM), and by vapor deposition, for example, the semi-transparent and semi-reflective electrodes in the same layer in a plurality of sub-pixels are fabricated at the same time, so as to save the process and reduce the cost.

By using an Open Mask (OM), reflective electrodes on the same layer in a plurality of sub-pixels are fabricated simultaneously, or transparent electrodes on the same layer in a plurality of sub-pixels are fabricated simultaneously, for example, by sputtering, thereby saving the process and reducing the cost.

Illustratively, the transflective electrodes in different layers in the plurality of sub-pixel units are fabricated by using a fine metal mask (FINE METAL MASK, FMM).

The embodiment of the application also provides a driving method of the display panel. The driving method is used for controlling the display panel, the display panel comprises a first substrate, a second substrate and a plurality of pixel units located between the first substrate and the second substrate, wherein the first substrate is a transparent substrate, the pixel units comprise a plurality of sub-pixel units, each sub-pixel unit comprises a plurality of light emitting units which are stacked in a first direction, the first direction is the direction of the first substrate to the second substrate, the plurality of light emitting units comprise a first light emitting unit and a second light emitting unit which are stacked in the first direction, the display panel further comprises a first driving circuit and a second driving circuit, the first light emitting unit and the second light emitting unit are respectively connected with the first driving circuit and the second driving circuit and emit light with different colors, the first driving circuit is located on one side, far away from the second light emitting unit, of the second light emitting unit, the sub-pixel units comprise a first electrode, a first light emitting layer and a second electrode which are stacked in sequence, in the first direction, the first light emitting unit comprises a third electrode, a first light emitting layer and a second electrode, the second light emitting unit comprises a third light emitting layer and a fourth light emitting layer which are stacked in sequence, the first electrode and the second electrode are a semi-transparent and semi-reflective cavity, and the first electrode and the second electrode are semi-transparent and the semi-reflective electrode are formed in the semi-reflective cavity. The method comprises the following steps:

the first step, obtaining a control instruction;

And a second step of driving at least one light emitting unit of the first light emitting unit and the second light emitting unit of the sub-pixel unit to emit light based on the control instruction.

In the embodiment of the application, the first light-emitting unit and the second light-emitting unit are independently controlled, and at least one light-emitting unit in the first light-emitting unit and the second light-emitting unit is driven to emit light, so that different sub-pixel units can be lightened, and a display function is realized.

In an exemplary embodiment, one of the first and second light emitting units is a blue light emitting unit and the other light emitting unit is a yellow light emitting unit, and 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, and the driving method includes:

the first step, obtaining a control instruction;

When the control instruction is a first control instruction, applying a first current signal to a blue light emitting unit of the white sub-pixel unit, and applying a second current signal to a yellow light emitting unit of the white sub-pixel unit, so that the white sub-pixel unit emits first color light;

When the control instruction is a second control instruction, applying a third current signal to a blue light emitting unit of the white sub-pixel unit, and applying a fourth current signal to a yellow light emitting unit of the white sub-pixel unit so as to enable the white sub-pixel unit to emit second color light;

The first current signal is smaller than the third current signal, the second current signal is larger than the fourth current signal, and the color temperature of the first color light is lower than that of the second color light.

In the embodiment of the application, the brightness of the blue sub-pixel unit and the brightness of the yellow sub-pixel unit in the white sub-pixel unit are changed by changing the magnitudes of the current signals respectively flowing through the first light-emitting unit and the second light-emitting unit, so that the function of changing the color temperature of the light emitted by the white sub-pixel unit is realized. Therefore, the color temperature of the light emitted by the white sub-pixel unit at this time can be taken as a target color temperature based on a certain control instruction, and the magnitudes of the current signals flowing through the blue light emitting unit and the yellow light emitting unit can be respectively controlled on the basis of the control instruction, so that the color temperature of the light emitted by the white sub-pixel unit can be freely regulated, for example, the color temperature of the light emitted by the white sub-pixel unit is warmer than the target color temperature, or the color temperature of the light emitted by the white sub-pixel unit is colder than the target color temperature.

The embodiment of the application also provides a display device which comprises a power supply circuit and any display panel, wherein the power supply circuit is used for supplying power to the display panel.

The display device provided by the embodiment of the application can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

The display device has the same effects as the aforementioned display panel, and will not be described herein.

It is noted that the terminology used in the implementation section of the embodiments of the present application is used for the purpose of explaining the embodiments of the present application only and is not intended to limit the embodiments of the present application. Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those having ordinary skill in the art to which the embodiments of the present application belong. The terms "first," "second," "third," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. References to directional terms in the embodiments of the present application, such as "top", "bottom", "upper", "lower", "left" or "right", etc., are only with reference to the directions of the drawings, and thus, the directional terms are used for better, more clear description and understanding of the embodiments of the present application, rather than to indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

The foregoing is illustrative of the present application and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., which fall within the spirit and principles of the present application.

Claims

The display panel is characterized by comprising a first substrate, a second substrate, a plurality of pixel units, a first driving circuit and a second driving circuit, wherein the pixel units are positioned between the first substrate and the second substrate, and the first substrate is a transparent substrate;

the pixel unit comprises a plurality of sub-pixel units, wherein the sub-pixel units at least comprise a first light emitting unit and a second light emitting unit which are stacked in a first direction, and the first direction is the direction that the first substrate points to the second substrate;

The first light-emitting unit is electrically connected with the first driving circuit, the second light-emitting unit is electrically connected with the second driving circuit, the first driving circuit is positioned at one side of the first light-emitting unit far away from the second light-emitting unit, and the second driving circuit is positioned at one side of the second light-emitting unit far 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 which are sequentially stacked, the second light emitting unit includes a third electrode, a second light emitting layer and a fourth electrode which are sequentially stacked, 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.
The display panel of claim 1, wherein in at least one of the sub-pixel units, the third electrode is the transflective electrode.
The display panel according to claim 2, wherein 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 within the sub-pixel unit;

The pixel unit comprises a red sub-pixel unit, a green sub-pixel unit and a first blue sub-pixel unit, the display panel further comprises a color film layer, the color film layer is located on one side, far away from the second light-emitting unit, of the first light-emitting unit, the color film layer comprises a red block, a green block and a first hollowed-out area, the orthographic projection of the red block on the second substrate is at least partially overlapped with the orthographic projection of the red sub-pixel unit on the second substrate, the orthographic projection of the green block on the second substrate is at least partially overlapped with the orthographic projection of the green sub-pixel unit on the second substrate, and the orthographic projection of the first hollowed-out area on the second substrate is at least partially overlapped with the orthographic projection of the first blue sub-pixel unit on the second substrate.
A display panel according to claim 3, wherein 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 half-transmissive half-reflective electrode.
The display panel of claim 3, wherein the pixel cell further comprises a white sub-pixel cell within which one of the first electrode, the second electrode, and the third electrode is the semi-transparent semi-reflective electrode.
A display panel according to claim 3, wherein the light emitting layer of the yellow light emitting unit comprises a red light emitting layer and a yellow light emitting layer which are laminated.
A display panel according to claim 3, characterized in that the light-emitting layer of the yellow light-emitting unit comprises a mixed red light-emitting material and yellow light-emitting material.
A display panel according to claim 3, wherein the blue light emitting unit comprises two blue light emitting layers stacked, and a charge generating layer located between the two blue light emitting layers stacked.
The display panel of claim 3, wherein the pixel cell further comprises a second blue sub-pixel cell, the color film layer further comprises a second hollowed-out region, and an orthographic projection of the second hollowed-out region on the second substrate at least partially coincides with an orthographic projection of the second blue sub-pixel cell on the second substrate.
The display panel according to claim 2, wherein in the sub-pixel unit, one of the first light emitting unit and the second light emitting unit is a blue light emitting unit, and a light emitting layer of the other light emitting unit includes a red light emitting layer and a green light emitting layer which are stacked;

The pixel unit comprises a red sub-pixel unit, a green sub-pixel unit and a first blue sub-pixel unit, the display panel further comprises a color film layer, the color film layer is located on one side, far away from the second light-emitting unit, of the first light-emitting unit, the color film layer comprises a red block, a green block and a first hollowed-out area, the orthographic projection of the red block on the second substrate is at least partially overlapped with the orthographic projection of the red sub-pixel unit on the second substrate, the orthographic projection of the green block on the second substrate is at least partially overlapped with the orthographic projection of the green sub-pixel unit on the second substrate, and the orthographic projection of the first hollowed-out area on the second substrate is at least partially overlapped with the orthographic projection of the first blue sub-pixel unit on the second substrate.
The display panel according to any one of claims 3 to 10, further comprising a first pixel definition layer and a second pixel definition layer;

The first pixel definition layer is positioned on one side of the first substrate close to the first light-emitting unit, and comprises a plurality of first sub-pixel openings, and the orthographic projections of the plurality of first sub-pixel openings on the second substrate are at least partially overlapped with the orthographic projections of the plurality of sub-pixel units on the second substrate;

the second pixel definition layer is located on one side of the second substrate, close to the second light-emitting unit, and comprises a plurality of second sub-pixel openings, orthographic projections of the plurality of second sub-pixel openings on the second substrate are at least partially overlapped with orthographic projections 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.
The display panel according to claim 11, further comprising a first driving circuit layer and a second driving circuit layer, wherein the first driving circuit layer is located on a side of the first substrate close to the first light emitting unit, the first driving circuit layer is located in the first driving circuit layer, the second driving circuit layer is located on a side of the second substrate close to the second light emitting unit, and the second driving circuit layer is located in the second driving circuit layer;

At least part of the orthographic projection of the first driving circuit on the second substrate is positioned in the orthographic projection of the first sub-pixel definition layer on the second substrate.
The display panel according to any one of claims 3 to 10, further comprising a filling structure, the filling structure is located between the first light emitting unit and the second light emitting unit and is connected with the first light emitting unit and the second light emitting unit.
The display panel according to claim 2, wherein the sub-pixel unit further includes a third light emitting unit, a third substrate, and a third driving circuit between the first light emitting unit and the second light emitting unit, colors of light emitted from the first light emitting unit, the second light emitting unit, and the third light emitting unit are different from each other, and 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, which are sequentially stacked.
The display panel according to any one of claims 3 to 10, 12 and 14, wherein the plurality of sub-pixel units includes first and second target sub-pixel units having different emission colors;

and in the first direction, the half-transmission and half-reflection electrode in the first target sub-pixel unit is positioned at one side of the half-transmission and half-reflection electrode in the second target sub-pixel unit.
The display panel according to any one of claims 3 to 10, 12 and 14, wherein the plurality of sub-pixel units includes first and second target sub-pixel units having different emission colors;

And the semi-transparent and semi-reflective electrode in the first target sub-pixel unit and the semi-transparent and semi-reflective electrode in the second target sub-pixel unit are in the same layer.
A method for manufacturing a display panel, the method comprising:

Providing a first substrate and a second substrate;

manufacturing a first light-emitting unit on the first substrate, manufacturing a second light-emitting unit on the second substrate, and connecting the first substrate and the second substrate relatively to obtain a display panel;

The display panel comprises a plurality of pixel units, a first driving circuit and a second driving circuit, wherein the pixel units are arranged between the first substrate and the second substrate, the pixel units comprise a plurality of sub-pixel units, the sub-pixel units at least comprise a first light emitting unit and a second light emitting unit which are stacked in a first direction, and the first direction is the direction that the first substrate points to the second substrate;

The first light-emitting unit is electrically connected with the first driving circuit, the second light-emitting unit is electrically connected with the second driving circuit, the first driving circuit is positioned at one side of the first light-emitting unit far away from the second light-emitting unit, and the second driving circuit is positioned at one side of the second light-emitting unit far 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 which are sequentially stacked, the second light emitting unit includes a third electrode, a second light emitting layer and a fourth electrode which are sequentially stacked, 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.
A driving method of a display panel, wherein the driving method is used for controlling the display panel, the display panel comprises a first substrate, a second substrate and a plurality of pixel units positioned between the first substrate and the second substrate, wherein the first substrate is a transparent substrate, the pixel units comprise a plurality of sub-pixel units, the sub-pixel units comprise a plurality of light emitting units which are stacked in a first direction, the first direction is a direction in which the first substrate points to the second substrate, the plurality of light emitting units comprise a first light emitting unit and a second light emitting unit which are stacked in the first direction, the display panel further comprises a first driving circuit and a second driving circuit, the first light emitting unit and the second light emitting unit are respectively connected with the first driving circuit and the second driving circuit, the color of emitted light is different, the first driving circuit is positioned on one side of the first light emitting unit far away from the second light emitting unit, and the second driving circuit is positioned on one side of the second light emitting unit far 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 which are sequentially stacked, the second light emitting unit includes a third electrode, a second light emitting layer and a fourth electrode which are sequentially stacked, 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;

The method comprises the following steps:

Acquiring a control instruction;

And driving at least one light emitting unit of the first light emitting unit and the second light emitting unit of the sub-pixel unit to emit light based on the control instruction.
The driving method according to claim 18, wherein 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 including 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 comprising:

Acquiring a control instruction;

When the control instruction is a first control instruction, a first current signal is applied to a blue light emitting unit of the white sub-pixel unit, and a second current signal is applied to a yellow light emitting unit of the white sub-pixel unit, so that the white sub-pixel unit emits first color light;

When the control instruction is a second control instruction, applying a third current signal to a blue light emitting unit of the white sub-pixel unit, and applying a fourth current signal to a yellow light emitting unit of the white sub-pixel unit so as to enable the white sub-pixel unit to emit second color light;

The first current signal is smaller than the third current signal, the second current signal is larger than the fourth current signal, and the color temperature of the first color light is lower than that of the second color light.
A display device comprising a power supply circuit and the display panel according to any one of claims 1 to 16, the power supply circuit supplying power to the display panel.