Display panel and driving method therefor, and display device

Abstract

A display panel and a driving method therefor, and a display device. The display panel comprises first light-emitting units, and each first light-emitting unit comprises at least two first light-emitting layers which are stacked and at least three first electrodes. The at least three first electrodes and the at least two first light-emitting layers are alternately stacked, and each first light-emitting layer is located between two adjacent first electrodes. The at least two first light-emitting layers emit light having the same wavelength range. Among the two adjacent first electrodes on both sides of each first light-emitting layer, at least one first electrode is independently arranged in the electrode layer where the at least one first electrode is located, and the at least two first light-emitting layers are configured to independently emit light and not emit the light simultaneously.

Description

Display panel, driving method thereof and display device

[0001] This application claims priority to Chinese Patent Application No. 202410417752.1, filed on April 8, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of display, and in particular, to a display panel, a driving method thereof and a display device. BACKGROUND

[0003] OLED (Organic Light Emitting Diode) has been widely used in the display field due to its advantages of self-luminescence, low driving voltage, high luminous efficiency, fast response speed and flexible display. How to improve the service life of the OLED display panel is one of the research directions of the person skilled in the art. SUMMARY

[0004] In one aspect, a display panel is provided. The display panel includes a first light emitting unit, the first light emitting unit including at least two layers of first light emitting layers and at least three first electrodes stacked, the at least three first electrodes and the at least two layers of first light emitting layers being alternately stacked, and each layer of first light emitting layers being located between two adjacent first electrodes. The at least two layers of first light emitting layers have the same hue and the same lightness of light emitting color. Among the two first electrodes adjacent to each side of each layer of first light emitting layers, at least one first electrode is independently arranged in the electrode layer in which it is located. The at least two layers of first light emitting layers are configured to emit light independently and not simultaneously.

[0005] In some embodiments, the display panel further includes a second light emitting unit arranged adjacent to the first light emitting unit. The second light emitting unit includes a second light emitting layer and a second electrode stacked, and along the stacking direction, one second electrode is arranged adjacent to each side of the second light emitting layer. The center wavelength of the light emitted by the second light emitting layer and the center wavelength of the light emitted by the first light emitting layer differ by less than 70 nm. Among the two second electrodes adjacent to each side of the second light emitting layer, at least one second electrode is independently arranged in the electrode layer in which it is located. The first light emitting layer and the second light emitting layer are configured to emit light independently and not simultaneously.

[0006] In some embodiments, the hue of the light emitting color of the first light emitting layer and the second light emitting layer is red, the wavelength of the light emitting color of the second light emitting layer is longer than that of the first light emitting layer; or the hue of the light emitting color of the first light emitting layer and the second light emitting layer is green, the wavelength of the light emitting color of the first light emitting layer is longer than that of the second light emitting layer; or the hue of the light emitting color of the first light emitting layer and the second light emitting layer is blue, the wavelength of the light emitting color of the first light emitting layer is longer than that of the second light emitting layer.

[0007] In some embodiments, the luminance of the light-emitting color of the second light-emitting layer is lower than that of the first light-emitting layer.

[0008] In some embodiments, the light-emitting efficiency of the first light-emitting layer is higher than that of the second light-emitting layer.

[0009] In some embodiments, the second light-emitting unit further comprises a third light-emitting layer stacked with the second light-emitting layer; along the stacking direction, the third light-emitting layer is adjacent to one second electrode on each side. The difference between the central wavelength of the light emitted by the third light-emitting layer and the central wavelength of the light emitted by the second light-emitting layer is less than 70 nm. Among the two second electrodes adjacent to the two sides of the third light-emitting layer, at least one second electrode is independently arranged in the electrode layer in which it is located; the third light-emitting layer and the second light-emitting layer are configured to emit light independently and not at the same time.

[0010] In some embodiments, the wavelength range of the light emitted by the third light-emitting layer is the same as that of the light emitted by the first light-emitting layer. The third light-emitting layer and the first light-emitting layer are configured to emit light independently and at the same time.

[0011] In some embodiments, the third light-emitting layer and the first light-emitting layer are made of the same material, and one layer of the third light-emitting layer is arranged in the same layer as one layer of the first light-emitting layer.

[0012] In some embodiments, the second light-emitting unit is configured to emit light from one side, and the third light-emitting layer is closer to the light-emitting side of the second light-emitting unit than the second light-emitting layer.

[0013] In some embodiments, the second light-emitting unit comprises at least two layers of third light-emitting layers, and the wavelength ranges of the light emitted by the at least two layers of third light-emitting layers are the same. The at least two layers of third light-emitting layers are configured to emit light independently and not at the same time.

[0014] In some embodiments, the second light-emitting unit comprises at least two layers of second light-emitting layers, and the wavelength ranges of the light emitted by the at least two layers of second light-emitting layers are the same. The at least two layers of second light-emitting layers are configured to emit light independently and not at the same time.

[0015] In some embodiments, one first light-emitting unit is adjacent to at least one second light-emitting unit.

[0016] In some embodiments, the display panel further comprises a third light emitting unit. The third light emitting unit comprises at least two layers of fourth light emitting layers and a fifth light emitting layer stacked together, the at least two layers of fourth light emitting layers emit white light by color mixing, and the fifth light emitting layer has the same wavelength range as the light emitted by one of the at least two layers of fourth light emitting layers. The at least two layers of fourth light emitting layers are configured to emit light independently and simultaneously, and the fifth light emitting layer is configured to emit light independently and not simultaneously with the fourth light emitting layer having the same wavelength range as the light emitted thereby.

[0017] In some embodiments, the display panel further comprises a pixel defining layer comprising opening regions, and one of the first light emitting unit, the second light emitting unit and the third light emitting unit is arranged in one opening region.

[0018] In another aspect, a display device is provided. The display device comprises the display panel and the circuit board as described in any of the above embodiments, and the display panel is connected to the circuit board.

[0019] In yet another aspect, a driving method of a display panel is provided. The display panel comprises at least two layers of first light emitting layers stacked together, and the at least two layers of first light emitting layers emit light having the same wavelength range. The driving method comprises driving different layers of the first light emitting layers in the first light emitting unit to emit light at different times.

[0020] In some embodiments, the display panel further comprises a second light emitting unit arranged adjacent to the first light emitting unit, and the second light emitting unit comprises a second light emitting layer, and the center wavelength of the light emitted by the second light emitting layer and the center wavelength of the light emitted by the first light emitting layer have a difference of less than 70 nm. The driving method further comprises driving the second light emitting layer and the first light emitting layer to emit light at different times.

[0021] In some embodiments, the second light emitting unit further comprises a third light emitting layer stacked together with the second light emitting layer, and the third light emitting layer emits light having the same wavelength range as the light emitted by the first light emitting layer. The driving method further comprises driving one layer of the third light emitting layer and one layer of the first light emitting layer to emit light simultaneously, and driving the second light emitting layer and the third light emitting layer to emit light at different times. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present disclosure, the following will briefly introduce the drawings needed to be used in some embodiments of the present disclosure. Obviously, the drawings described in the following description are only the drawings of some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art according to these drawings. In addition, the drawings described in the following description can be regarded as schematic diagrams, and are not limited to the actual size, actual process, actual timing of signals, etc. of the products involved in the embodiments of the present disclosure.

[0023] FIG. 1 is a structural diagram of a display device according to some embodiments;

[0024] FIG. 2 is a plan view of a display device according to some embodiments;

[0025] FIG. 3 is a cross-sectional view of a light emitting unit according to some embodiments;

[0026] FIG. 4 is a cross-sectional view of a light emitting unit according to some other embodiments;

[0027] FIG. 5 is a lifetime curve of a light emitting unit according to some embodiments;

[0028] FIG. 6 is a color gamut diagram of a display panel according to some embodiments;

[0029] FIG. 7 is a color gamut diagram of a display panel according to some other embodiments;

[0030] FIG. 8 is a spectral response curve of a human eye;

[0031] FIG. 9 is a color gamut diagram of a display panel according to some embodiments;

[0032] FIG. 10 is a color gamut diagram of a display panel according to some other embodiments. DETAILED DESCRIPTION

[0033] The technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present disclosure.

[0034] Unless otherwise required by context, the term “comprise” and other forms of the term “comprise”, such as “comprises” and “comprising”, are to be construed as open-ended, i.e. as “including, but not limited to”, in the entire description and claims. In the description of the specification, the terms “one embodiment”, “some embodiments”, “exemplary embodiments”, “example”, “specific example” or “some examples” etc. are intended to mean that a particular feature, structure, material or characteristic included in at least one embodiment or example of the present disclosure. The illustrative representation of the above terms does not necessarily mean the same embodiment or example. In addition, the specific features, structures, materials or characteristics described can be included in any one or more embodiments or examples in any appropriate manner.

[0035] The terms "first", "second", etc. are used herein only to describe one feature distinguishable from another, and cannot be understood as indicating or implying relative importance or implying a number of the features indicated. Thus, the features defined with "first", "second" can include one or more of the features explicitly or implicitly. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0036] In describing some embodiments, "coupled" and "connected", and variations thereof, can be used. The term "connected" is to be interpreted broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrated; can be directly connected, or indirectly connected through an intermediate medium. The term "coupled" indicates, for example, that two or more components have direct physical contact or electrical contact. The term "coupled" or "communicatively coupled" can also mean that two or more components do not have direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0037] "A, B, and C at least one of" has the same meaning as "at least one of A, B, or C", and includes the following combinations of A, B, and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C.

[0038] "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0039] As used herein, the term "if' is, optionally, interpreted as meaning "when" or "upon" or "in response to a determination" or "in response to a detection of", depending on the context. Similarly, the phrase "if it is determined" or "if [a stated condition or event] is detected" is, optionally, interpreted as meaning "upon determining" or "in response to a determination" or "upon detecting [a stated condition or event]" or "in response to a detection of [a stated condition or event]", depending on the context.

[0040] In addition, the use of "based on" means open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values can be based on additional conditions or values in practice.

[0041] As used herein, "about," "approximately," or "around" includes the recited value and the average value within an acceptable range of deviation from the particular value, as determined by one of ordinary skill in the art taking into account the measurement being discussed and the error associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0042] As used herein, "parallel," "perpendicular," "equal" includes the recited condition and conditions that approximate the recited condition, the approximation being within an acceptable range of deviation, as determined by one of ordinary skill in the art taking into account the measurement being discussed and the error associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallel and near parallel, where the acceptable range of deviation for near parallel can be, for example, within 5°; "perpendicular" includes absolute perpendicular and near perpendicular, where the acceptable range of deviation for near perpendicular can also be, for example, within 5°. "Equal" includes absolute equality and near equality, where the acceptable range of deviation for near equality can be, for example, a difference between the two that is less than or equal to 5% of either.

[0043] It will be understood that when a layer or element is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate, or intervening layers can also be present.

[0044] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are idealized examples of exemplary embodiments. In the drawings, the thickness of layers and regions are exaggerated for clarity. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region illustrated as a rectangle will typically have rounded or curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

[0045] Some embodiments of the disclosure provide a display device 100. As shown in FIGS. 1 and 2, the display device 100 includes a display panel 10 and a circuit board 20, and the display panel 10 is connected to the circuit board 20.

[0046] The display device 100 can be any device that displays, whether moving (e.g., video), stationary (e.g., still images), textual, or graphical. More specifically, it is contemplated that the embodiments can be implemented in and / or used with a variety of electronic devices, including, but not limited to, mobile telephones, wireless devices, PDA's (Personal Digital Assistants), PIAs (Personal Information Assistants), handheld or portable computers, GPS receivers / navigators, cameras, camcorders, game consoles, wearable devices, tablet display, computer monitors, auto displays (e.g., odometer display, etc.), cockpit controls and / or displays, camera view displays (e.g., display of a rear view camera in a vehicle), electronic advertisements or billboards, and aesthetic structures (e.g., display of images on a piece of jewelry), and the like.

[0047] Exemplarily, the display device 100 can further include a frame and other electronic accessories, etc., and the display panel 10 can be disposed in the frame, for example. The circuit board 20 is configured to send driving signals, e.g., display driving signals and / or touch driving signals, to the display panel 10. The display panel 10 displays images and / or implements touch operations under the driving of the circuit board 20.

[0048] The circuit board 20 includes, but is not limited to, a PCB (Printed Circuit Board) or a FPC (Flexible Printed Circuit).

[0049] In some embodiments, as shown in FIG. 2, the display panel 10 includes a back plate 01 and a plurality of pixels disposed on the back plate 01, each of which includes at least three sub-pixels P of different colors. As shown in FIG. 2, each sub-pixel P includes one light emitting unit 02, for example, each of which is capable of emitting light of at least one color, and in one display frame of the display panel 10, one light emitting unit 02 emits light of one color. The light emitted by the light emitting units 02 of at least three different colors is mixed, so that the display panel 10 can display color or black and white images.

[0050] Exemplarily, the back plate 01 includes a substrate and a driving circuit layer disposed on the substrate, and the driving circuit layer includes a plurality of pixel circuits, each of which is coupled with one light emitting unit 02. The pixel circuit is configured to drive the light emitting unit 02 connected thereto to emit light.

[0051] Exemplarily, the substrate substrate can be a single-layer substrate including one layer of substrate material, or a composite substrate including at least two layers of substrate material arranged in a stack. The substrate material can be a rigid material or a flexible material. The rigid substrate material includes, but is not limited to, rigid glass, quartz, or plastic, etc. The flexible substrate material includes, but is not limited to, flexible glass, FPC, PI-based film (Polyimide), PC (Polycarbonate), or PVC (Polyvinyl Chloride), etc.

[0052] Correspondingly, the substrate substrate can be a rigid substrate substrate or a flexible substrate substrate. The rigid substrate substrate can include one or more layers of rigid substrate material, or include at least one layer of rigid substrate material and at least one layer of flexible substrate material arranged in a stack.

[0053] It should be noted that the material of the substrate substrate is related to the specific design of the display panel 10, and can be selected according to actual needs. Herein, only exemplary descriptions are provided, and the disclosure is not limited in this regard.

[0054] In some embodiments, the light emitting unit 02 is an OLED light emitting unit, and correspondingly, the display panel is an OLED display panel. Based on this, the light emitting unit 02 can be a top emission type, in which case the side of the light emitting unit 02 away from the back plate 01 is the light emitting side of the light emitting unit 02; or the light emitting unit 02 can also be a bottom emission type, in which case the side of the light emitting unit 02 close to the back plate 01 is the light emitting side of the light emitting unit 02. The specific design can be adapted according to actual needs, and the disclosure does not limit this.

[0055] The luminous intensity of the OLED light emitting unit decreases with the increase of the working time (the cumulative light emitting time of the OLED light emitting unit). The decrease of the luminous intensity of the OLED light emitting unit can be referred to as the aging phenomenon of the OLED light emitting unit. With the aging of the OLED light emitting unit, the service life of the OLED light emitting unit continuously decreases. When the cumulative light emitting time of the OLED light emitting unit reaches the light emitting life (unit: hour), the luminous intensity of the OLED light emitting unit cannot meet the picture display requirements of the OLED display panel, thereby causing the problem of abnormal picture display of the OLED display panel, for example, the appearance of dark spots (Dead Pixel) or crushed bright spots (Crushed Pixel) in the OLED display panel.

[0056] The service life S of the OLED light-emitting unit refers to the ratio of the light-emitting brightness Ls of the LED light-emitting unit to the initial light-emitting brightness Lc of the OLED light-emitting unit, S = Ls / Lc, which is a percentage value. The light-emitting service life of the OLED light-emitting unit refers to the time required for the actual light-emitting brightness Ls of the OLED light-emitting unit to decrease from the initial light-emitting brightness Lc of the OLED light-emitting unit to a set percentage of the initial light-emitting brightness Lc of the OLED light-emitting unit.

[0057] The set percentage can be set according to actual needs and can be 50%, 75%, 90%, 95%, etc. according to different application scenarios of the OLED light-emitting unit. For example, when the OLED light-emitting unit is applied to the display screen of a mobile phone, the set percentage can be 95%; when the OLED light-emitting unit is applied to the display screen of a vehicle-mounted display, the set percentage can be 80%; and when the OLED light-emitting unit is applied to a pen with a display screen, the set percentage can be 50%.

[0058] Specifically, adaptive design can be made according to needs, which is only illustrative and not limiting.

[0059] Taking the application of the OLED light-emitting unit to the display screen of a mobile phone as an example, the set percentage is 95%, and the initial light-emitting brightness of the OLED light-emitting unit is Lc under the driving of the driving current I1. As the cumulative light-emitting time of the OLED light-emitting unit increases from 0 to T0, the current light-emitting brightness Ls of the OLED light-emitting unit decreases to 95% x Lc under the driving of the same driving current I1. In this way, the service life of the OLED light-emitting unit is T0, and when the light-emitting time of the OLED light-emitting unit exceeds T0, the display quality of the OLED display panel decreases significantly, which cannot meet the normal picture display requirements, and the display brightness decreases significantly, which can be obviously felt by the human eye, and the visual experience of the human eye when watching the display picture decreases.

[0060] It can be seen that the OLED light-emitting unit, as an important component of the OLED display panel, has a certain influence on the display quality and service life of the OLED display panel. As the cumulative light-emitting time of the OLED light-emitting unit increases, the light-emitting brightness of the OLED light-emitting unit under the driving of the same current or voltage will gradually decrease, so that in the OLED display panel, as the service life of the OLED light-emitting unit decreases, the picture display quality of the OLED display panel will also decrease.

[0061] Based on this, the present disclosure provides a light-emitting unit 02. The light-emitting unit 02 is a color light-emitting unit.

[0062] In some embodiments, the light emitting unit 02 comprises at least two layers of light emitting layers arranged in a stack, each of the light emitting layers in the same light emitting unit 02 is configured to emit light independently and not simultaneously. Based on this, the light emitting unit 02 comprises a first light emitting unit 1 and a second light emitting unit 2, the light emitting layers in the first light emitting unit 1 all emit light in the same wavelength range, and the light emitting layers in the second light emitting unit 2 do not all emit light in the same wavelength range.

[0063] The specific structure of the first light emitting unit 1 is described below.

[0064] In some embodiments, as shown in FIG. 3 and FIG. 4, the first light emitting unit 1 comprises at least two layers of first light emitting layers 11 arranged in a stack, each of the first light emitting layers 11 is configured to emit light independently and not simultaneously.

[0065] The first light emitting unit 1 comprises M layers of first light emitting layers 11, M is a positive integer greater than or equal to 2. Exemplarily, the light emitted by the first light emitting layer 11(i) (2≤i≤M, i is a positive integer) is in the wavelength range of a spectral color.

[0066] Taking the first light emitting unit 1 as a red light emitting unit as an example, each of the first light emitting layers 11 is a red light emitting layer. The wavelength range of red light is 620nm-780nm, and the wavelength range of red light is relatively large. The wavelength range of the light emitted by each of the first light emitting layers 11 can be the same wavelength band within the wavelength range of red light, or the wavelength range of the light emitted by each of the first light emitting layers 11 can be the same as the wavelength range of red light. That is, in the same red light emitting unit, the wavelength range of the light emitted by all the first light emitting layers 11 is [λ1, λ2], where λ1 and λ2 are both in nm, and 620≤λ1<λ2≤780.

[0067] When the first light emitting unit 1 is in light emitting display, only one of the first light emitting layers 11, for example, the first light emitting layer 11(1) shown in FIG. 5, is lit. As the cumulative light emitting time of the lit first light emitting layer 11(1) increases, the service life of the first light emitting layer 11(1) gradually decreases, while the remaining first light emitting layers 11 that are not lit do not emit light, and the first light emitting layers 11 that do not emit light do not have aging phenomenon (service life decay).

[0068] When the service life of the lit first light emitting layer 11(1) decreases to a set value, the first light emitting layer 11(1) is no longer used for light emitting display, and any one of the remaining first light emitting layers 11 in the first light emitting unit 1, for example, the first light emitting layer 11(2) shown in FIG. 5, is lit for light emitting display.

[0069] Since the wavelength range of the light emitted by the first light-emitting layer 11(2) is the same as that of the light emitted by the first light-emitting layer 11(1), when the first light-emitting unit 1 is implemented to emit light by replacing the first light-emitting layer 11(1) with the first light-emitting layer 11(2), the light-emitting color of the first light-emitting unit 1 remains unchanged, and the light-emitting brightness of the first light-emitting layer 11(2) is closer to the initial light-emitting brightness, so the light-emitting brightness of the first light-emitting unit 1 can still meet the requirements.

[0070] Some embodiments of the present disclosure are described by taking 98% as the set value of the lower limit of the service life S of the first light-emitting layer 11. It should be noted that the set value of the lower limit of the service life S of the first light-emitting layer 11 can be set according to actual needs, and can also be 50%, 75%, 90%, 95%, etc. The specific adaptive design can be made according to the needs, which is only used as an exemplary description and does not limit the present disclosure.

[0071] FIG. 5 is a service life curve diagram of the first light-emitting unit 1. The abscissa in FIG. 5 is the cumulative light-emitting time T of the first light-emitting unit 1, and the ordinate in FIG. 5 is the brightness service life S of the first light-emitting layer 11 in the first light-emitting unit 1, S = Ls / Lc, wherein Ls is the current light-emitting brightness of the first light-emitting layer 11, and Lc is the set target brightness of the first light-emitting layer 11 (the set target brightness of the first light-emitting unit 1). The light-emitting brightness Ls of the first light-emitting layer 11 decreases with the increase of the cumulative light-emitting time of the first light-emitting layer 11.

[0072] Referring to FIG. 5, during the time when the cumulative light-emitting time of the first light-emitting unit 1 increases from 0 to t1, the first light-emitting layer 11(1) can be lit for light-emitting display. When the cumulative light-emitting time of the first light-emitting unit 1 reaches t1, the cumulative light-emitting time of the first light-emitting layer 11(1) reaches t1. At this time, the service life of the first light-emitting layer 11(1) decays to the set lower limit value of 98%, and the actual light-emitting brightness of the first light-emitting unit 1 decays to 98% of the initial light-emitting brightness.

[0073] Therefore, after the cumulative light-emitting time of the first light-emitting unit 1 reaches t1, the first light-emitting layer 11(1) is no longer lit, but the first light-emitting layer 11(2) is lit for light-emitting display. The service life of the first light-emitting layer 11(2) is higher than 98%, so the light-emitting brightness requirement of the first light-emitting unit 1 can be met. The service life of the first light-emitting layer 11(2) decays to 98% when the cumulative light-emitting time of the first light-emitting unit 1 increases to t2, and the cumulative light-emitting time of the first light-emitting unit 1 decays to 98% when the cumulative light-emitting time of the first light-emitting unit 1 increases from t1 to t2. The time during which the light-emitting brightness of the first light-emitting unit 1 can be greater than or equal to the set brightness is prolonged, thereby prolonging the service life of the first light-emitting unit 1, and further prolonging the service life of the display panel 10 carrying the light-emitting unit 02.

[0074] In the embodiment, when the first light emitting unit 1 includes two layers of the first light emitting layer 11, the light emitting life of the first light emitting unit 1 can be extended from t1 to t2, and correspondingly, the life of the display panel 10 carrying the first light emitting unit 1 is also extended.

[0075] When the first light emitting unit 1 includes the first light emitting layer 11 with a number of layers not less than two, the total light emitting life of the first light emitting layer 11 (the total light emitting life of the first light emitting layer 11 is the sum of the light emitting life of each first light emitting layer 11) is extended, thereby extending the light emitting life of the first light emitting unit 1. The more the number of the first light emitting layer 11 in the first light emitting unit 1, the better the life extension effect of the first light emitting unit 1. The specific number of layers can be selected according to actual needs, and the present disclosure does not limit this.

[0076] The specific structure of the second light emitting unit 2 is introduced below.

[0077] In some embodiments, as shown in FIGS. 3 and 4, the second light emitting unit 2 includes at least one layer of the second light emitting layer 21 and at least one layer of the third light emitting layer 23 arranged in a stack, the third light emitting layer 23 and the second light emitting layer 21 emit light with different wavelength ranges. The third light emitting layer 23 and the second light emitting layer 21 are configured to emit light independently and not at the same time. The number of layers of at least one of the third light emitting layer 23 and the second light emitting layer 21 is greater than or equal to 2.

[0078] The second light emitting unit 2 includes P layers of the third light emitting layer 23 and Q layers of the second light emitting layer 21, P and Q are both positive integers greater than or equal to 1. When P is greater than or equal to 2, the P layers of the third light emitting layer 23 in the second light emitting unit 2 emit light with the same wavelength range, and the P layers of the third light emitting layer 23 are configured to emit light independently and not at the same time. When Q is greater than or equal to 2, the Q layers of the second light emitting layer 21 in the second light emitting unit 2 emit light with the same wavelength range, and the Q layers of the second light emitting layer 21 are configured to emit light independently and not at the same time.

[0079] Referring to the description of the first light emitting unit 1 above, in the second light emitting unit 2, the total light emitting life of one of the third light emitting layer 23 and the second light emitting layer 21 with a number of layers greater than or equal to 2 is extended, so that the light emitting life of the second light emitting unit 2 is also extended accordingly.

[0080] Exemplarily, the wavelength range of the light emitted by the third light-emitting layer 23 (j) (1≤j≤P, j is a positive integer) and the wavelength range of the light emitted by the second light-emitting layer 21 (k) (1≤k≤Q, k is a positive integer) can be different wavelength bands falling within the wavelength range of the same color light; or the wavelength range of the light emitted by the third light-emitting layer 23 (j) and the wavelength range of the light emitted by the second light-emitting layer 21 (k) can also fall within the wavelength ranges of two colors of light, and the difference between the central wavelength of the light emitted by the third light-emitting layer 23 (j) and the central wavelength of the light emitted by the second light-emitting layer 21 (k) is less than 70 nm.

[0081] The wavelength range of the light emitted by the third light-emitting layer 23 (j) is [λ3, λ4], and the wavelength range of the light emitted by the second light-emitting layer 21 (k) is [λ5, λ6], where λ3, λ4, λ5, and λ6 are all in nm.

[0082] For example, 620≤λ3<λ4<λ5<λ6≤780, or 620≤λ5<λ6<λ3<λ4≤780. The wavelength range of the light emitted by the third light-emitting layer 23 (j) and the wavelength range of the light emitted by the second light-emitting layer 21 (k) fall within different wavelength bands in the wavelength range of red light.

[0083] In this way, the wavelength range of the light emitted by the third light-emitting layer 23 (i) and the wavelength range of the light emitted by the second light-emitting layer 21 (k) are both within the wavelength range of red light, so the third light-emitting layer 23 (i) and the second light-emitting layer 21 (k) both emit red light, but the wavelength ranges of the light emitted by the two are different, so the actual light-emitting colors of the two are slightly different. For example, the light emitted by the second light-emitting layer 21 and the light emitted by the third light-emitting layer 23 are both red light, but the brightness of the light-emitting color of the second light-emitting layer 21 is lower than the brightness of the light-emitting color of the first light-emitting layer 11, that is, the red light emitted by the second light-emitting layer 21 is darker than the red light emitted by the first light-emitting layer 11, and the second light-emitting layer 21 and the first light-emitting layer 11 emit red light of different brightness.

[0084] For another example, the wavelength range of the light emitted by the third light-emitting layer 23 (j) falls within the wavelength range of one color of light, and the wavelength range of the light emitted by the second light-emitting layer 21 (k) falls within the wavelength range of another color of light. 630≤λ3<λ4≤660, 605≤λ5<λ6≤615; or 605≤λ3<λ4≤615, 630≤λ5<λ6≤660. In this way, the difference between the central wavelength of the light emitted by the third light-emitting layer 23 (j) and the central wavelength of the light emitted by the second light-emitting layer 21 (k) is 30 nm, and the light-emitting color of one of the third light-emitting layer 23 (j) and the second light-emitting layer 21 (k) is red, and the light-emitting color of the other is orange.

[0085] The wavelength range of the light emitted by the third light-emitting layer 23 and the wavelength range of the light emitted by the second light-emitting layer 21 are not limited to the above examples and can be adaptively designed as needed. For details, refer to the description of the display panel 10 below, which will not be described here.

[0086] In some embodiments, the third light-emitting layer 23 has a different light-emitting life than the second light-emitting layer 21. Based on this, in the second light-emitting unit 2, the number of layers of the one of the third light-emitting layer 23 and the second light-emitting layer 21 that has a longer light-emitting life is 1, and the number of layers of the other one is greater than or equal to 2. Of course, the number of layers of the one of the third light-emitting layer 23 and the second light-emitting layer 21 that has a longer light-emitting life can also be two or more layers.

[0087] As known from the foregoing, the life S of the light-emitting layer will decay with the cumulative light-emitting time of the light-emitting layer. When the light-emitting layer with a shorter light-emitting life in the second light-emitting unit 2 reaches the light-emitting life, if the second light-emitting unit 2 continues to use the light-emitting layer that has reached the light-emitting life for light-emitting display, the second light-emitting unit 2 can have a light-emitting abnormality problem, which can be reflected in the display panel carrying the second light-emitting unit 2 as abnormal display such as dark spots or broken bright spots.

[0088] Taking an example in which the light-emitting life of the third light-emitting layer 23 is lower than the light-emitting life of the second light-emitting layer 21.

[0089] If the number of layers of the third light-emitting layer 23 and the second light-emitting layer 21 in the second light-emitting unit 2 is the same, for example, the second light-emitting unit 2 includes one layer of the third light-emitting layer 23 and one layer of the second light-emitting layer 21, and the cumulative light-emitting time of the third light-emitting layer 23 and the second light-emitting layer 21 is the same or substantially the same, the third light-emitting layer 23 will reach the light-emitting life before the second light-emitting layer 21, and the third light-emitting layer 23 and the second light-emitting layer 21 emit light at different times. Therefore, when the third light-emitting layer 23 reaches the light-emitting life, the second light-emitting unit 2 can have a light-emitting abnormality problem in the case of using the third light-emitting layer 23 to emit light.

[0090] Based on this, in the present embodiment, the third light-emitting layer 23 with a shorter light-emitting life is provided as at least two layers in the second light-emitting unit 2, and when one of the layers of the third light-emitting layer 23 reaches the light-emitting life, it can be replaced by another layer of the third light-emitting layer 23 for light-emitting display. In this way, the total light-emitting life of the third light-emitting layer 23 in the second light-emitting unit 2 is the sum of the light-emitting lives of the two layers of the third light-emitting layer 23, thereby prolonging the light-emitting life of the third light-emitting layer 23 and further prolonging the light-emitting life of the second light-emitting unit 2.

[0091] The embodiments of the present disclosure also provide a third light-emitting unit, which can be a white light-emitting unit. The third light-emitting unit comprises at least two layers of fourth light-emitting layers and a fifth light-emitting layer stacked together, the at least two layers of fourth light-emitting layers mix colors to emit white light, and the fifth light-emitting layer has the same wavelength range as the light emitted by one of the at least two layers of fourth light-emitting layers. The at least two layers of fourth light-emitting layers are configured to emit light independently and simultaneously, and the fifth light-emitting layer is configured to emit light independently and not simultaneously with the fourth light-emitting layer having the same wavelength range as the light emitted thereby.

[0092] Exemplarily, the third light-emitting unit comprises K layers of fourth light-emitting layers, K being a positive integer greater than or equal to 2. The third light-emitting unit comprises J layers of fifth light-emitting layers, J being a positive integer greater than or equal to 1.

[0093] The K layers of fourth light-emitting layers emit light with different wavelength ranges, i.e., different colors. The K layers of fourth light-emitting layers are configured to emit light independently and simultaneously, and the light emitted by the K layers of fourth light-emitting layers mixes colors to make the third light-emitting unit emit white light. Any one of the K layers of fourth light-emitting layers in the third light-emitting unit can be lit up independently.

[0094] At least one of the J layers of fifth light-emitting layers has the same wavelength range as the light emitted by one of the K layers of fourth light-emitting layers, i.e., the same color. The J layers of fifth light-emitting layers are configured to emit light independently.

[0095] The light-emitting layers in the third light-emitting unit that emit light with the same wavelength range are configured to emit light not simultaneously, and the light-emitting layers with different colors are configured to emit light simultaneously. Among the K layers of fourth light-emitting layers and the J layers of fifth light-emitting layers in the third light-emitting unit, the light-emitting layers that emit light with the same wavelength range are configured to emit light not simultaneously. That is, among the K layers of fourth light-emitting layers and the J layers of fifth light-emitting layers in the third light-emitting unit, the light-emitting layers that emit light with the same color are configured to emit light not simultaneously.

[0096] In the case where the third light-emitting unit comprises two layers of fourth light-emitting layers, the colors of the light emitted by the two layers of fourth light-emitting layers are optically complementary. For example, the two layers of fourth light-emitting layers in the third light-emitting unit can be a yellow light-emitting layer and a blue light-emitting layer, and the yellow light emitted by the yellow light-emitting layer and the blue light emitted by the blue light-emitting layer mix colors to make the third light-emitting unit emit white light.

[0097] Based on the above, in some examples, the third light-emitting unit can comprise one layer of fifth light-emitting layer, which can be a yellow light-emitting layer and a blue light-emitting layer.

[0098] In some examples, the third light emitting unit can include one layer of fifth light emitting layer, and the one layer of fifth light emitting layer can be a red light emitting layer, a green light emitting layer, and a blue light emitting layer.

[0099] In some examples, the third light emitting unit can include one layer of fifth light emitting layer, and the one layer of fifth light emitting layer can be a red light emitting layer, a green light emitting layer, and a blue light emitting layer.

[0100] In some examples, the third light emitting unit can include one layer of fifth light emitting layer, and the one layer of fifth light emitting layer can be a red light emitting layer, a green light emitting layer, and a blue light emitting layer.

[0101] In some examples, the third light emitting unit can include one layer of fifth light emitting layer, and the one layer of fifth light emitting layer can be a red light emitting layer, a green light emitting layer, and a blue light emitting layer.

[0102] In some examples, the third light emitting unit can include one layer of fifth light emitting layer, and the one layer of fifth light emitting layer can be a red light emitting layer, a green light emitting layer, and a blue light emitting layer.

[0103] In some examples, the third light emitting unit can include one layer of fifth light emitting layer, and the one layer of fifth light emitting layer can be a red light emitting layer, a green light emitting layer, and a blue light emitting layer.

[0104] In some examples, the third light emitting unit can include one layer of fifth light emitting layer, and the one layer of fifth light emitting layer can be a red light emitting layer, a green light emitting layer, and a blue light emitting layer.

[0105] Embodiments of the present disclosure also provide a display panel 10. As shown in FIG. 2, the display panel 10 comprises a plurality of light-emitting units 02. As shown in FIGS. 3 and 4, the plurality of light-emitting units 02 at least comprises a first light-emitting unit 1, and the first light-emitting unit 1 comprises at least two first light-emitting layers 11 and at least three first electrodes 12 which are alternately and sequentially arranged. Among them, the light-emitting layers 11 in the same first light-emitting unit 1 emit light with the same wavelength range. The first light-emitting layers 11 in the same light-emitting unit 1 are configured to emit light independently and not at the same time.

[0106] The first light-emitting unit 1 can be the first light-emitting unit 1 described in the foregoing embodiments.

[0107] Exemplarily, the first light-emitting layers 11 in the same first light-emitting unit 1 can be made of the same material.

[0108] Referring to the foregoing description of the first light-emitting unit 1, since only one of the first light-emitting layers 11 is lit for light-emitting display when the first light-emitting unit 1 is lit, the remaining first light-emitting layers 11 do not emit light. Therefore, during the process that the first light-emitting unit 1 is lit and continuously emits light, only the service life S of the lit first light-emitting layer 11 gradually decreases with the increase of the cumulative light-emitting time of the first light-emitting unit 1, while the service life S of the remaining first light-emitting layers 11 does not change.

[0109] As shown in FIG. 5, when the service life S of the lit first light-emitting layer 11 decreases to a set value, the first light-emitting layer 11 with the service life S decreasing to the set value is no longer used for light-emitting display, and any one of the remaining first light-emitting layers 11 is lit as a substitute for light-emitting display, and the process is repeated in turn. In this way, the total light-emitting life of the first light-emitting layers 11 in the first light-emitting unit 1 is the sum of the light-emitting lives of the first light-emitting layers 11, and the service life of the first light-emitting unit 1 is prolonged by prolonging the total light-emitting life of the first light-emitting layers 11 in the first light-emitting unit 1.

[0110] Exemplarily, as shown in FIGS. 3 and 4, among the at least three first electrodes 12 comprised by the first light-emitting unit 1, the first electrode 12 closest to the back plate 01 is a reflective electrode, and the remaining first electrodes 12 are semi-transparent and semi-reflective electrodes. Based on this, the light-emitting mode of the first light-emitting unit 1 is “top emission”, and the light emitted by the first light-emitting unit 1 is emitted from the back plate 01 to the direction away from the back plate 01.

[0111] In some embodiments, among the two first electrodes 12 adjacent to the first light-emitting layer 11 on both sides, at least one first electrode 12 is independently arranged in the electrode layer where it is located.

[0112] A plurality of first electrodes 12 are arranged in the same electrode layer, and each first electrode 12 corresponds to a first light emitting unit 1. The independent arrangement of the first electrodes 12 in the electrode layer in which the first electrodes 12 are arranged means that the first electrodes 12 in each first light emitting unit 1 are spaced apart from each other. When one of the first electrodes 12 is connected to an arbitrary potential, the remaining first electrodes 12 in the same electrode layer can or can not be connected to a potential.

[0113] Of course, the plurality of first electrodes 12 can also be connected to each other in the electrode layer in which the first electrodes 12 are arranged. In this case, the electrode layer is an integral electrode layer, and when one of the first electrodes 12 is connected to an arbitrary potential, the remaining first electrodes 12 in the same electrode layer are also connected to the same potential.

[0114] When the first light emitting unit 1 emits light, different driving voltages are applied to the two first electrodes 12 adjacent to both sides of one of the first light emitting layers 11, so as to form a voltage difference on both sides of the first light emitting layer 11, thereby driving the first light emitting layer 11 to emit light. In the case where any one of the two first electrodes 12 on both sides of the first light emitting layer 11 is not connected to a driving voltage, the first light emitting layer 11 does not emit light.

[0115] By arranging at least one of the two first electrodes 12 adjacent to both sides of any one of the first light emitting layers 11 in the first light emitting unit 1 as an independent electrode, independent control of each of the first light emitting layers 11 in the first light emitting unit 1 can be achieved.

[0116] In some examples, each of the first electrodes 12 in the first light emitting unit 1 is independently arranged in the electrode layer in which the first electrode 12 is arranged.

[0117] In this way, each of the first electrodes 12 in the first light emitting unit 1 is an independent electrode, and each first electrode 12 is connected or not connected to a potential without affecting the remaining first electrodes 12. When it is necessary to drive any one of the first light emitting layers 11 in the first light emitting unit 1 to emit light, a driving voltage is applied to the two first electrodes 12 on both sides of the first light emitting layer 11, thereby driving the corresponding first light emitting layer 11 to emit light.

[0118] Compared with the technical solution in which the plurality of first electrodes 12 in the same electrode layer are connected to each other, the first electrodes 12 are arranged as independent electrodes, and the driving voltage can be directly applied to the corresponding first electrode 12, thereby facilitating the independent control of each of the first light emitting layers 11 in the first light emitting unit 1 (each first light emitting layer 11 can be individually lit). In addition, the independent electrode (each first electrode 11 is independently arranged) has lower power consumption than the integral electrode (the plurality of first electrodes 11 in the same electrode layer are connected to each other), and is more conducive to the low-power design of the display panel 10.

[0119] In some embodiments, as shown in FIG. 3 and FIG. 4, the plurality of light emitting units 02 further comprises: a second light emitting unit 2 disposed adjacent to the first light emitting unit 1. The second light emitting unit 2 comprises a third light emitting layer 23 and a second electrode 22 disposed in a stacked manner. Along the stacking direction, the third light emitting layer 23 is flanked by two second electrodes 22. The central wavelength of the light emitted by the third light emitting layer 23 and the central wavelength of the light emitted by the first light emitting layer 11 differ by less than 70 nm. The first light emitting layer 11 and the third light emitting layer 23 are configured to emit light independently and simultaneously.

[0120] The second light emitting unit 2 can be the second light emitting unit 2 described in the foregoing embodiments.

[0121] Exemplarily, the third light emitting layer 23 and the first light emitting layer 11 are made of the same material, and a layer of the third light emitting layer 23 is disposed in the same layer as a layer of the first light emitting layer 11. The wavelength range of the light emitted by the third light emitting layer 23 is the same as the wavelength range of the light emitted by the first light emitting layer 11.

[0122] Referring to FIG. 3 and FIG. 4, the first light emitting layer 11 of the first light emitting unit 1 closest to the back plate 01 and the third light emitting layer 23 of the second light emitting unit 2 closest to the back plate 01 can be disposed in the same layer. In this way, during the preparation of the display panel 10, a layer of the first light emitting layer 11 in the first light emitting unit 1 and a layer of the third light emitting layer 23 in the second light emitting unit 2 can be prepared simultaneously in the same step, thereby reducing the process steps, saving the process cost, and improving the preparation efficiency of the display panel 10.

[0123] Here, "in the same layer" refers to a layer structure formed by using the same film forming process to form a film layer for forming a specific pattern, and then using the same mask plate to form by a one-time patterning process. According to different specific patterns, the one-time patterning process can include multiple exposure, development or etching processes, can also include evaporation processes, or printing, inkjet and other processes for forming predetermined patterns; and the specific patterns in the formed layer structure can be continuous or discontinuous, and these specific patterns can also be at different heights or have different thicknesses.

[0124] Exemplarily, in the display panel 10, each first light emitting unit 1 is adjacent to at least one second light emitting unit 2.

[0125] In the display panel 10, one sub-pixel P comprises one first light emitting unit 1 or one second light emitting unit 2, and an adjacent first light emitting unit 1 and a second light emitting unit 2 can serve as a sub-pixel group.

[0126] When the display panel 10 displays a picture, one layer of the first light-emitting layer 11 in the first light-emitting unit 1 in one sub-pixel group emits light at a first luminance L1, and one layer of the third light-emitting layer 23 in the second light-emitting unit 2 in the sub-pixel group emits light at a second luminance L2, L2 < L1, the third light-emitting layer 23 emits light at a luminance lower than that of the first light-emitting layer 11 to compensate for luminance, so that the sub-pixel group emits light at a third luminance L3, L3 = L1 + L2. In the case that the first light-emitting layer 11 and the third light-emitting layer 23 in one sub-pixel group emit light at the same time, each sub-pixel group can be regarded as the smallest display unit in the display panel 10.

[0127] It can be seen that, without the second light-emitting unit 2, the first light-emitting unit 1 needs to emit light at the third luminance L3 to enable the display panel 10 to emit light at the third luminance L3. In the embodiment, the first light-emitting unit 1 emits light at the first luminance L1, and the third light-emitting layer 23 of the second light-emitting unit 2 emits light at the second luminance L2 to compensate for luminance, so that the luminance of each sub-pixel P in the display panel 10 is less than L3, but the display panel 10 can still emit light at the third luminance L3, and the luminance requirement of the display panel 10 can be met by the high / low luminance collocation of adjacent sub-pixels P in the display panel 10.

[0128] Meanwhile, compared with not setting the second light-emitting unit 2, when the display panel 10 displays a picture of the same luminance, the luminance of each sub-pixel P in the display panel 10 is reduced, and accordingly, the power consumption of each sub-pixel P is also reduced, thereby reducing the power consumption of the display panel 10.

[0129] If the luminance difference between the first light-emitting unit 1 and the third light-emitting layer 23 of the second light-emitting unit 2 adjacent to each other is too large, the light emitted by the third light-emitting layer 23 in one sub-pixel group is not easy to be observed by the human eye, thereby failing to achieve the luminance compensation effect. If the luminance difference between the first light-emitting unit 1 and the third light-emitting layer 23 of the second light-emitting unit 2 adjacent to each other is too small, the effect of reducing the power consumption of the display panel 10 is not obvious.

[0130] Exemplarily, 0.5 x L1 < L2 < 0.7 x L1. By controlling the luminance of the first light-emitting layer 11 and the third light-emitting layer 23 within a certain ratio, the technical effect of reducing the power consumption of the display panel 10 can be better achieved.

[0131] In some embodiments, at least one of the two second electrodes 22 adjacent to the two sides of the third light-emitting layer 23 is independently arranged in the electrode layer in which it is located.

[0132] Exemplarily, both of the two second electrodes 22 adjacent to the two sides of the third light-emitting layer 23 are independently arranged in the electrode layer in which they are located.

[0133] By setting at least one of the two second electrodes 22 adjacent to the third light-emitting layer 23 on both sides as an independent electrode, it is conducive to realizing the independent control (independent lighting) of the third light-emitting layer 23 in the second light-emitting unit 2.

[0134] For details, please refer to the description of the setting mode of the first electrode 12 above, which will not be repeated here.

[0135] In some embodiments, the second light-emitting unit 2 includes at least two layers of third light-emitting layers 23, the wavelengths of the light emitted by the at least two layers of third light-emitting layers 23 are the same, and the at least two layers of third light-emitting layers 23 are configured to emit light independently and not at the same time.

[0136] Exemplarily, the materials of the third light-emitting layers 23 in the second light-emitting unit 2 are the same.

[0137] By setting at least two layers of third light-emitting layers 23 in the second light-emitting unit 2 that emit light independently and not at the same time, only one of the at least two layers of third light-emitting layers 23 is lit for light-emitting display in the process of the second light-emitting unit 2 emitting light by the third light-emitting layer 23, and the rest of the third light-emitting layers 23 do not emit light. Therefore, in the process of the third light-emitting layer 23 being lit and continuously emitting light, only the life of the third light-emitting layer 23 being lit gradually decays as the cumulative length of time of its light emission increases, while the life of the rest of the third light-emitting layers 23 does not change.

[0138] When the life S of the third light-emitting layer 23 being lit decays to a set value (the set value can be 50%, 75%, 90% or 95%, etc., which can be adaptively designed according to actual needs), the third light-emitting layer 23 whose life S decays to the set value is no longer used for light-emitting display, and any one of the rest of the third light-emitting layers 23 is lit as a replacement for light-emitting display, and the cycle is repeated. In this way, the total light-emitting life of the third light-emitting layers 23 in the second light-emitting unit 2 is the sum of the light-emitting life of each third light-emitting layer 23, and the total light-emitting life of the third light-emitting layers 23 in the second light-emitting unit 2 is prolonged, thereby prolonging the service life of the second light-emitting unit 2.

[0139] For details, please refer to the description of the first light-emitting unit 1 above, which will not be repeated here.

[0140] In some embodiments, as shown in FIG. 3 and FIG. 4, the second light-emitting unit 2 further includes: a second light-emitting layer 21 stacked with the third light-emitting layer 23, and two second electrodes 22 are respectively arranged adjacent to the two sides of the second light-emitting layer 21 in the stacking direction. The difference between the central wavelength of the light emitted by the second light-emitting layer 21 and the central wavelength of the light emitted by the third light-emitting layer 23 is less than 70nm; and the third light-emitting layer 23 and the second light-emitting layer 21 are configured to emit light independently and not at the same time.

[0141] In the process of emitting light by the second light emitting unit 2, only one of the third light emitting layer 23 or the second light emitting layer 21 in the second light emitting unit 2 is lighted, so as to avoid the problem that the light emitting colors of the second light emitting layer 21 and the third light emitting layer 23 are different and the second light emitting unit 2 emits light with abnormal color.

[0142] In some embodiments, at least one of the two second electrodes 22 adjacent to the second light emitting layer 21 is independently arranged in the electrode layer where the second electrode 22 is located.

[0143] For example, both of the two second electrodes 22 adjacent to the second light emitting layer 21 are independently arranged in the electrode layer where the second electrode 22 is located.

[0144] By arranging at least one of the two second electrodes 22 adjacent to the second light emitting layer 21 as an independent electrode, it is beneficial to realize the independent control (independent lightening) of the second light emitting layer 21 in the second light emitting unit 2.

[0145] For details, refer to the description of the arrangement mode of the first electrode 12 above, which will not be repeated here.

[0146] In some embodiments, the second light emitting layer 21 and the first light emitting layer 11 are configured to emit light independently and not at the same time.

[0147] The third light emitting layer 23 emits light with the same wavelength range as the first light emitting layer 11, and the second light emitting layer 21 emits light with a different wavelength range from the third light emitting layer 23, so the light emitting color of the second light emitting layer 21 is different from the light emitting color of the first light emitting layer 11. Therefore, in the process of displaying a picture by the display panel 10, when the second light emitting layer 21 in the second light emitting unit 2 is lighted, the first light emitting unit 1 does not emit light, and the third light emitting layer 23 in the second light emitting unit 2 also does not emit light, so as to avoid the problem that the light emitting colors of the adjacent sub-pixels (the first light emitting unit 1 and the second light emitting unit 2) are mixed to cause color display abnormality.

[0148] At this time, each second light emitting unit 2 can be regarded as the smallest display unit in the display panel 10.

[0149] In some embodiments, the second light emitting unit 2 is configured to emit light from one side, and the second light emitting layer 21 is closer to the light emitting side of the second light emitting unit 2 than the third light emitting layer 23.

[0150] The light emitted by the light-emitting layer in the light-emitting unit 02 needs to pass through the film layer structure above it before it can be emitted. As shown in FIG. 3, the light emitted by the first light-emitting layer 11 close to the light-emitting layer (the side away from the back plate 01) in the first light-emitting unit 1 needs to pass through at least the first electrode 12 above it before it can be emitted, while the light emitted by the first light-emitting layer 11 close to the back plate 01 needs to pass through at least one layer of the first light-emitting layer 11 and two layers of the first electrode 12 before it can be emitted. That is, the light emitted by the light-emitting layer closer to the back plate 01 needs to pass through more layers of film layer structure before it can be emitted.

[0151] Correspondingly, in the second light-emitting unit 2, the light emitted by the second light-emitting layer 21 passes through fewer layers of film layer structure than the third light-emitting layer 23. When the light passes through any layer of film layer structure in the display panel 10, the transmittance of the light is less than 100%. The lower the transmittance, the more light loss. The brightness of the final emitted light is related to the light transmittance, so the fewer layers of film layer structure the light emitted by the light-emitting layer passes through, the higher the light transmittance, which tends to be closer to 100%, and the less the light-emitting unit 02 loses in brightness.

[0152] The second light-emitting layer 21 is used for independent light-emitting display. When the second light-emitting layer 21 emits light, the first light-emitting unit 1 does not emit light, and only the second light-emitting layer 21 of each second light-emitting unit 2 emits light in the display panel 10. Thus, the picture display of the display panel 10 is mainly realized by the second light-emitting layer 21, and therefore the brightness of the second light-emitting layer 21 has a direct impact on the display brightness of the display panel 10.

[0153] In this embodiment, the second light-emitting layer 21 is arranged closer to the light-emitting side of the second light-emitting unit 2. Thus, in the second light-emitting unit 2, the light emitted by the second light-emitting layer 21 passes through fewer layers of film layer structure than the light emitted by the third light-emitting layer 23, so that the light transmittance of the light emitted by the second light-emitting layer 21 is higher than that of the light emitted by the third light-emitting layer 23, and the second light-emitting layer 21 loses less in brightness. Thus, when the display panel 10 realizes picture display by the second light-emitting layer 21, it can have a better picture display effect.

[0154] As described above, in the case where the second light-emitting unit 2 and the first light-emitting unit 1 emit light at the same time, the third light-emitting layer 23 in the second light-emitting unit 2 and the first light-emitting layer 11 in the first light-emitting unit 1 emit light at the same time to realize brightness compensation. The second light-emitting unit 2 is an auxiliary light-emitting unit of the first light-emitting unit 1, and is mainly used to provide brightness compensation for the first light-emitting unit 1. Therefore, the brightness of the third light-emitting layer 23 has less impact on the display brightness of the display panel 10. Thus, when the display panel 10 realizes picture display by the first light-emitting layer 11 and the third light-emitting layer 23, it can also have a better picture display effect.

[0155] Based on the above, the light-emitting color of the third light-emitting layer 23 is different from the light-emitting color of the second light-emitting layer 21 at least includes the following several cases.

[0156] In order to facilitate the clear description of the light-emitting color of the light-emitting unit 02 and each light-emitting layer therein, the following first introduces some technical terms and related standards in the field of optics.

[0157] Fig. 6 is a CIE (International Commission on Illumination, French: Commission Internationale de l'Eclairage, using French abbreviation CIE) 1931 chromaticity diagram.

[0158] The tongue-shaped curve in Fig. 6 represents the continuously changing monochromatic light with a wavelength of 380nm-780nm, which is called a spectral locus, and the numbers marked on the spectral locus are the wavelengths (in nm) of the spectral colors corresponding to the points on the spectral locus; all monochromatic lights are located on the tongue-shaped curve, so the spectral locus can also be a monochromatic light locus line. A straight line connecting the two endpoints of the spectral locus is called a "purple-red line", and the colors perceived by the human eye are located within the closed figure (CIE color space) surrounded by the spectral locus and the purple-red line.

[0159] The red band of the spectrum is located at the lower right corner of the CIE color space, the green band is located at the upper left corner of the CIE color space, and the blue band is located at the lower left corner of the CIE color space. The central region of the CIE color space is the white light region, and the color corresponding to the coordinate point in this region observed by the human eye is white.

[0160] In Fig. 6, the horizontal coordinate x represents the red component, the vertical coordinate y represents the green component, and the blue component z can be calculated as z=(1-x-y). According to the values of x and y, the corresponding color can be determined. The E point in Fig. 6 is the equal energy white point (Equal Energy Spectrum), and the coordinates in the CIE 1931 chromaticity diagram are (1 / 3, 1 / 3). The equal energy white point E is a reference white point (White Point). The equal energy white point E is located in the white light region.

[0161] Referring to FIG. 6, for a point A1 on the CIE 1931 chromaticity diagram, a straight line is drawn from the equal-energy white point E through the point A1, and the extended line is drawn until it intersects the spectral locus at a point A0. The wavelength of the color corresponding to the point A0 is the dominant wavelength of the color corresponding to the point A1, and the color of the point A0 on the spectral locus is the hue of the color corresponding to the point A1. The ratio of the distance between the equal-energy white point E and the point A1 to the distance between the equal-energy white point E and the point A0 is the color purity Pe, which is used to represent the saturation of the color of the point A1. The higher the color purity Pe, the higher the saturation of the color of the point A1, the purer the color of the point A1, and the closer the color of the point A1 to the color corresponding to the dominant wavelength. Similarly, the colors represented by the remaining points on the CIE 1931 chromaticity diagram can be analyzed.

[0162] In some embodiments, as shown in FIG. 6, the light-emitting color of the second light-emitting layer 21 and the light-emitting color of the third light-emitting layer 23 correspond to the same dominant wavelength but different coordinates on the CIE 1931 chromaticity diagram.

[0163] For example, the light-emitting color of the second light-emitting layer 21 and the light-emitting color of the third light-emitting layer 23 correspond to the same dominant wavelength, and the color purity of the light-emitting color of the second light-emitting layer 21 is higher than that of the light-emitting color of the third light-emitting layer 23.

[0164] For example, as shown in FIG. 6, the light-emitting color of the third light-emitting layer 23 corresponds to a coordinate point A1 on the CIE 1931 chromaticity diagram, and the light-emitting color of the second light-emitting layer 21 can correspond to a coordinate point A2 on the CIE 1931 chromaticity diagram.

[0165] For another example, as shown in FIG. 6, the light-emitting color of the third light-emitting layer 23 corresponds to a coordinate point B1 on the CIE 1931 chromaticity diagram, and the light-emitting color of the second light-emitting layer 21 can correspond to a coordinate point B2 on the CIE 1931 chromaticity diagram.

[0166] For another example, as shown in FIG. 6, the light-emitting color of the third light-emitting layer 23 corresponds to a coordinate point C1 on the CIE 1931 chromaticity diagram, and the light-emitting color of the second light-emitting layer 21 can correspond to a coordinate point C2 on the CIE 1931 chromaticity diagram.

[0167] In other embodiments, the dominant wavelength of the light-emitting color of one of the second light-emitting layer 21 and the third light-emitting layer 23 is the wavelength of the light-emitting color of the other.

[0168] For example, the wavelength of the light-emitting color of the second light-emitting layer 21 is the dominant wavelength of the light-emitting color of the third light-emitting layer 23.

[0169] For example, referring to FIG. 6, the light-emitting color of the third light-emitting layer 23 corresponds to a point C0 in the CIE 1931 chromaticity diagram, and the light-emitting color of the second light-emitting layer 21 can correspond to a point C1 or a point C2 in the CIE 1931 chromaticity diagram.

[0170] In yet some embodiments, the light-emitting color of the third light-emitting layer 23 and the light-emitting color of the second light-emitting layer 21 both correspond to points on the spectral locus in the CIE 1931 chromaticity diagram, and the difference between the wavelength of the light-emitting color of the third light-emitting layer 23 and the wavelength of the light-emitting color of the second light-emitting layer 21 is less than 70 nm.

[0171] For example, as shown in FIG. 6, the light-emitting color of one of the third light-emitting layer 23 and the second light-emitting layer 21 corresponds to a point R2 in the CIE 1931 chromaticity diagram, and the light-emitting color of the other corresponds to a point R3 or a point R1 in the CIE 1931 chromaticity diagram. The difference between the wavelength of the light-emitting color corresponding to the point R2 and the wavelength of the light-emitting color corresponding to the point R3 is 10 nm, and the difference between the wavelength of the light-emitting color corresponding to the point R2 and the wavelength of the light-emitting color corresponding to the point R1 is 20 nm.

[0172] In yet some embodiments, the light-emitting color of the third light-emitting layer 23 and the light-emitting color of the second light-emitting layer 21 both correspond to points on the spectral locus in the CIE 1931 chromaticity diagram, and the difference between the wavelength of the light-emitting color of the third light-emitting layer 23 and the wavelength of the light-emitting color of the second light-emitting layer 21 is less than 70 nm.

[0173] For example, as shown in FIG. 7, the light-emitting color of one of the third light-emitting layer 23 and the second light-emitting layer 21 corresponds to a point A1 in the CIE 1931 chromaticity diagram, and the light-emitting color of the other corresponds to a point A2 in the CIE 1931 chromaticity diagram. The dominant wavelength of the light color corresponding to the point A1 is 570 nm, the dominant wavelength of the light color corresponding to the point A2 is 630 nm, and the difference between the dominant wavelength of the light-emitting color corresponding to the point A1 and the dominant wavelength of the light-emitting color corresponding to the point A2 is 60 nm.

[0174] In yet some embodiments, the wavelength range of the light emitted by the second light-emitting layer 21 and the wavelength range of the light emitted by the third light-emitting layer 23 belong to different wavebands within the wavelength range of the same color light. The wavelength range of the light emitted by the third light-emitting layer 23 (j) is [λ3, λ4], and the wavelength range of the light emitted by the second light-emitting layer 21 (k) is [λ5, λ6].

[0175] In some examples, the hue of the light-emitting color of the second light-emitting layer 21 and the hue of the light-emitting color of the third light-emitting layer 23 are both red, and the wavelength of the light emitted by the third light-emitting layer 23 is longer than the wavelength of the light emitted by the first light-emitting layer 11. Then, the light-emitting color of the first light-emitting layer 11 and the light-emitting color of the third light-emitting layer 23 observed by the human eye are different shades of red. For example, 620 ≤ λ3 < λ4 < λ5 < λ6 ≤ 780.

[0176] In some examples, the color phase of the light-emitting color of the second light-emitting layer 21 and the light-emitting color of the third light-emitting layer 23 is green, and the wavelength of the light emitted by the first light-emitting layer 11 is longer than the wavelength of the light emitted by the third light-emitting layer 23. Then, the light-emitting color of the first light-emitting layer 11 and the light-emitting color of the third light-emitting layer 23 observed by the human eye are different shades of green. For example, 495≤λ3<λ4<λ5<λ6≤560.

[0177] In some examples, the color phase of the light-emitting color of the second light-emitting layer 21 and the light-emitting color of the third light-emitting layer 23 is green, and the wavelength of the light emitted by the first light-emitting layer 11 is longer than the wavelength of the light emitted by the third light-emitting layer 23. Then, the light-emitting color of the first light-emitting layer 11 and the light-emitting color of the third light-emitting layer 23 observed by the human eye are different shades of green. For example, 495≤λ3<λ4<λ5<λ6≤560.

[0178] In some examples, as shown in FIG. 4, the second light-emitting unit 2 includes at least two layers of second light-emitting layers 21, the wavelengths of the light emitted by the at least two layers of second light-emitting layers 21 are the same, the at least two layers of second light-emitting layers 21 are configured to emit light independently and not at the same time.

[0179] Exemplarily, the materials of the second light-emitting layers 21 in the second light-emitting unit 2 are the same.

[0180] By providing at least two layers of second light-emitting layers 21 in the second light-emitting unit 2 that emit light independently and not at the same time, the total light-emitting life of the second light-emitting layers 21 in the second light-emitting unit 2 is the sum of the light-emitting life of each second light-emitting layer 21. By prolonging the total light-emitting life of the second light-emitting layers 21 in the second light-emitting unit 2, the service life of the second light-emitting unit 2 is prolonged.

[0181] For details, refer to the foregoing description of the first light-emitting unit 1, which will not be repeated here.

[0182] In some examples, the first light-emitting unit 1 includes M layers of first light-emitting layers 11, and the second light-emitting unit 2 includes P layers of third light-emitting layers 23 and Q layers of second light-emitting layers 21, where M≥2, and at least one of P and Q is greater than or equal to 2.

[0183] Exemplarily, the number of the first light-emitting layers 11 in the first light-emitting unit 1 is greater than the number of the second light-emitting layers 21 in the second light-emitting unit 2, and the number of the first light-emitting layers 11 in the first light-emitting unit 1 is greater than the number of the third light-emitting layers 23 in the second light-emitting unit 2. M>P, and M>Q.

[0184] For example, M = P + Q. In this way, the thicknesses of the plurality of light emitting units 02 (the first light emitting unit 1 and the second light emitting unit 2) on the display panel 10 are the same or substantially the same, ensuring the thickness uniformity of the display panel 10.

[0185] The following describes the collocation of the light emitting colors of the light emitting layers in the light emitting units 02 (the first light emitting unit 1 and the second light emitting unit 2) of the display panel 10.

[0186] Referring to FIGS. 6 and 7, in the CIE 1931 chromaticity diagram, any two coordinate points correspond to two colors of light, respectively. The colors of the light obtained by mixing the colors of light corresponding to the two coordinate points in different proportions must be on the straight line formed by connecting the two coordinate points. Referring to FIG. 6, the colors corresponding to any point on the line connecting the point A2 and the point B2 can be obtained by mixing the colors of light corresponding to the point A2 and the point B2 in a certain proportion.

[0187] If the straight line connecting the two coordinate points in the CIE 1931 chromaticity diagram passes through the white light region, the colors of light corresponding to the two coordinate points (for example, the point C0 and the point R0 in FIG. 6) are optical complementary colors. Of course, a set of complementary colors of light can also be found at the ends of the straight line passing through the equal-energy white light point E. If the straight line connecting the two coordinate points in the CIE 1931 chromaticity diagram does not pass through the white light region, the colors of light corresponding to the two coordinate points (for example, the point A2 and the point B2 in FIG. 6) cannot be called optical complementary colors.

[0188] Further, any three coordinate points selected in the CIE 1931 chromaticity diagram can be connected in turn to form a triangle, and all the colors in the triangle can be obtained by mixing the colors of light corresponding to the three coordinate points. The triangle is a color gamut.

[0189] In some embodiments, the display panel 10 includes first light emitting units 1 of at least three different light emitting colors. The first light emitting units 1 of the three different light emitting colors are sequentially numbered as the first light emitting unit 1(1), the first light emitting unit 1(2), and the first light emitting unit 1(3).

[0190] In some examples, the light emitted by the first light emitting unit 1(1), the first light emitting unit 1(2), and the first light emitting unit 1(3) is monochromatic light or quasi-monochromatic light, and the mixed colors of the light emitted by the first light emitting unit 1(1), the first light emitting unit 1(2), and the first light emitting unit 1(3) can make the first light emitting unit 1 emit white light.

[0191] Monochromatic light refers to light of a single frequency (or wavelength), and monochromatic light cannot produce dispersion. Quasi-monochromatic light refers to light containing a single frequency component, which is narrow in the frequency domain, that is, the line width is narrow, and the ratio of the spectral width Δv to the center frequency v0 satisfies Δv / v0 << 1.

[0192] In some examples, the light emitted by at least one of the first light emitting units 1(1), 1(2) and 1(3) is a complex color light, and the light emitting color of at least one of the other two is an optical complementary color of the color of the aforementioned complex color light.

[0193] The light emitting color of the first light emitting unit 1 is the light emitting color of the first light emitting layer 11, which is described below.

[0194] For example, the light emitting color of the first light emitting layer 11 in the first light emitting unit 1(1) can be the color light corresponding to point A1 in FIG. 6 or FIG. 7; the light emitting color of the first light emitting layer 11 in the first light emitting unit 1(2) can be the color light corresponding to point B1 in FIG. 6 or FIG. 7; and the light emitting color of the first light emitting layer 11 in the first light emitting unit 1(3) can be the color light corresponding to point C1 in FIG. 6 or FIG. 7.

[0195] The color light corresponding to point A1, the color light corresponding to point B1 and the color light corresponding to point C1 can constitute a color gamut A1B1C1. In this way, when the display panel 10 lights up the first light emitting unit 1 for picture display, the display panel 10 can display the color light corresponding to any coordinate point (including the vertices of the triangle A1B1C1 and any coordinate point on any side) in the color gamut A1B1C1.

[0196] In some embodiments, the display panel 10 comprises at least three second light emitting units 2 of different light emitting colors. The three second light emitting units 2 of different light emitting colors are sequentially numbered as second light emitting unit 2(1), second light emitting unit 2(2) and second light emitting unit 2(3).

[0197] The light emitting color of the third light emitting layer 23 in the second light emitting unit 2 is the same as that of the first light emitting layer 11. The light emitting color of the third light emitting layer 23 in the second light emitting unit 2(1) can be the color light corresponding to point A1 in FIG. 6 or FIG. 7; the light emitting color of the third light emitting layer 23 in the second light emitting unit 2(2) can be the color light corresponding to point B1 in FIG. 6 or FIG. 7; and the light emitting color of the third light emitting layer 23 in the second light emitting unit 2(3) can be the color light corresponding to point C1 in FIG. 6 or FIG. 7. For details, refer to the foregoing description of the first light emitting layer 11, which is not repeated here.

[0198] The light emitting color of the second light emitting layer 21 in the second light emitting unit 2 is different from that of the third light emitting layer 23.

[0199] For example, as shown in FIG. 6, the light-emitting color of the second light-emitting layer 21 in the second light-emitting unit 2(1) can be the color light corresponding to point A2 in FIG. 6 or FIG. 7; the light-emitting color of the second light-emitting layer 21 in the second light-emitting unit 2(2) can be the color light corresponding to point B2 in FIG. 6 or FIG. 7; and the light-emitting color of the second light-emitting layer 21 in the second light-emitting unit 2(3) can be the color light corresponding to point C2 in FIG. 6 or FIG. 7.

[0200] The color light corresponding to point A2, the color light corresponding to point B2, and the color light corresponding to point C2 can constitute a color gamut A2B2C2. In this way, when the first light-emitting unit 1 of the display panel 10 is lighted for picture display, the display panel 10 can display the color light corresponding to any coordinate point (including the vertexes of the triangle A2B2C2 and any coordinate point on any side of the triangle A2B2C2) in the color gamut A2B2C2.

[0201] Referring to FIG. 6 and FIG. 7, both the color gamut A2B2C2 and the color gamut A1B1C1 can be referred to as the display color gamut of the display panel 10.

[0202] The area of the color gamut A2B2C2 is larger than the area of the color gamut A1B1C1, and thus, when the display panel 10 realizes picture display by the second light-emitting layer 21 in the second light-emitting unit 2, the display color gamut of the display panel 10 is larger and wider, and more colors can be displayed, so that the display panel 10 has better color performance.

[0203] FIG. 8 is a graph of the spectral response curve of the human eye. The horizontal axis in FIG. 8 is the wavelength of light, and the unit is nm; the vertical axis is the normalized sensitivity of the human eye; and the curve in FIG. 8 is a photopic luminous efficiency curve.

[0204] The vertical lines of different colors in FIG. 8 are only used to distinguish different wavelengths and corresponding colors (for example, in FIG. 8, from left to right, there are different shades of blue, different shades of green, and different shades of red), and do not represent that the color corresponding to the wavelength is the color of the line.

[0205] The human eye has different perception capabilities for different wavelengths of visible light, i.e., the normalized sensitivity of the human eye corresponding to different wavelengths of light is different, the higher the normalized sensitivity of the human eye, the stronger the perception capability of the human eye for light of the wavelength, and accordingly, the higher the luminous efficiency of light of the wavelength. The wavelength of light of the same color is a range interval, therefore, light of different wavelengths can correspond to different color light (e.g., respectively corresponding to red light, green light and blue light), or correspond to different wavelengths of the same color (e.g., respectively corresponding to different wavelengths within the red light wavelength range).

[0206] In some embodiments, the luminous efficiency of the third light-emitting layer 23 is higher than the luminous efficiency of the second light-emitting layer 21.

[0207] For example, in the same second light-emitting unit 2, the coordinate point corresponding to the light-emitting color of the third light-emitting layer 23 in the CIE 1931 chromaticity diagram can be point A1 in FIG. 9, and at this time, the coordinate point corresponding to the light-emitting color of the second light-emitting layer 21 in the CIE 1931 chromaticity diagram can be point A2 in FIG. 9.

[0208] For another example, in the same second light-emitting unit 2, the coordinate point corresponding to the light-emitting color of the third light-emitting layer 23 in the CIE 1931 chromaticity diagram can be point B1 in FIG. 9, and at this time, the coordinate point corresponding to the light-emitting color of the second light-emitting layer 21 in the CIE 1931 chromaticity diagram can be point B2 in FIG. 9.

[0209] For another example, in the same second light-emitting unit 2, the coordinate point corresponding to the light-emitting color of the third light-emitting layer 23 in the CIE 1931 chromaticity diagram can be point C1 in FIG. 9, and at this time, the coordinate point corresponding to the light-emitting color of the second light-emitting layer 21 in the CIE 1931 chromaticity diagram can be point C2 in FIG. 9.

[0210] As shown in FIG. 8, the light color luminous efficiency corresponding to point A1 is higher than the light color luminous efficiency corresponding to point A2. The light color luminous efficiency corresponding to point B1 is higher than the light color luminous efficiency corresponding to point B2. The light color luminous efficiency corresponding to point C1 is higher than the light color luminous efficiency corresponding to point C2.

[0211] Based on the above, the wavelength range of the light emitted by the first light-emitting layer 11 and the third light-emitting layer 23 is the same, and both can be made of the same material, therefore, the luminous efficiency of the first light-emitting layer 11 is higher than the luminous efficiency of the second light-emitting layer 21.

[0212] The higher the luminous efficiency of the light-emitting layer, the smaller the driving voltage or driving current required for the light-emitting layer to emit light of the same brightness, and the lower the power consumption of the light-emitting layer. The higher the luminous efficiency of the light-emitting layer, the more conducive to reducing the power consumption of the light-emitting unit 02.

[0213] Therefore, when the colors included in the image to be displayed on the display panel 10 are all located in, or most of them are located in, the color gamut A1B1C1, the display panel 10 lights up the first light-emitting layer 11 and the third light-emitting layer 23 to realize picture display. In this way, compared with lighting up the second light-emitting layer 21 to display the picture, the power consumption of the light-emitting unit 02 that is lit in the display panel 10 is lower, which is conducive to achieving the effect of reducing the power consumption of the display panel 10.

[0214] Furthermore, the color of the image actually displayed by the display panel 10 is consistent or substantially consistent with the color of the image to be displayed, thereby ensuring that the display panel 10 has a good picture display effect while having low power consumption.

[0215] The image to be displayed mentioned here refers to the image of the next display frame in the display screen of the display panel 10. When the display panel 10 continuously displays the same image, the same image screen can last for multiple display frames, that is, multiple consecutive display frames display the same image.

[0216] Here, the "most of the colors in the color gamut A1B1C1" may mean that 95%, 98%, or more than 99% of the colors of the image to be displayed are in the color gamut A1B1C1. The specific adaptive design can be made according to actual needs. Different setting values ​​can be selected according to different application scenarios of the display panel 10 and the size of the display panel 10.

[0217] For example, when applied to a vehicle-mounted display screen, the display panel 10 is mainly used to realize assisted driving functions, such as providing vehicle-mounted navigation display, audio playback, etc., and the color reproduction of the image is not required to be high. Therefore, even if the overlap between the picture to be displayed and the color gamut A1B1C1 is greater than or equal to 90%, the color gamut A1B1C1 can be used to realize picture display, that is, the picture display is realized through the first light-emitting layer 11 and the third light-emitting layer 23; when the overlap between the picture to be displayed and the color gamut A1B1C1 is less than 90%, the color gamut A2B2C2 is used to realize picture display, that is, the picture display is realized through the second light-emitting layer 21.

[0218] When applied to a computer display or television, the display panel 10 is mainly used to realize image and video display, and has high requirements for the color reproduction of the displayed image. Therefore, when the overlap between the picture to be displayed and the color gamut A1B1C1 is greater than or equal to 98%, the color gamut A1B1C1 can be used to realize picture display, that is, the picture display is realized through the first light-emitting layer 11 and the third light-emitting layer 23; when the overlap between the picture to be displayed and the color gamut A1B1C1 is less than 98%, the color gamut A2B2C2 is used to realize picture display, that is, the picture display is realized through the second light-emitting layer 21.

[0219] This is an illustrative description and is not intended to limit the present disclosure.

[0220] In the display process of the display panel 10, the image to be displayed is transmitted in the form of a data signal, and it is determined according to the data signal corresponding to the image of the next display frame whether the display panel 10 realizes picture display by the first light-emitting layer 11 and the third light-emitting layer 23 or realizes light-emitting display by the second light-emitting layer 21.

[0221] When the colors included in the image to be displayed of the display panel 10 are mostly located outside the color gamut A1B1C1, the display panel 10 lights up the second light-emitting layer 21 to realize picture display, so that the color gamut (color gamut A2B2C2) that can be displayed by the display panel 10 is wider, thereby being able to more accurately present the colors (here, the colors are not limited to red, green, blue, etc., and also include black and white colors) in the picture to be displayed. In some embodiments of the present disclosure, when the display of the display panel 10 is realized by the second light-emitting layer 21 in the second light-emitting unit 2, the display color gamut of the display panel 10 can reach 99% DCP-P3, which can cover about 45% to 50% of the CIE 1931 chromaticity diagram, so that the display panel 10 can exhibit more saturated and more vivid colors, and can provide more abundant colors and smoother color gradation.

[0222] Most of the colors included in the image to be displayed of the display panel 10 outside the color gamut A1B1C1 means that x% or more of the colors of the image to be displayed are located outside the color gamut A1B1C1, and x is related to the type of the picture to be displayed. For example, when the picture to be displayed is a black and white picture, the value of x can be greater than or equal to 95; when the picture to be displayed is a color picture, the value of x is less than or equal to 8. The value can be adaptively designed according to the needs, and the value is exemplary and is not a limitation on the present disclosure.

[0223] Based on the above, referring to FIG. 10, the display panel 10 can also include the first light-emitting unit 1 having four different light-emitting colors and the second light-emitting unit 2 having four different light-emitting colors. For details, refer to the description of the display panel 10 including the first light-emitting unit 1 and the second light-emitting unit 2 having three different light-emitting colors, which will not be described here.

[0224] Embodiments of the present disclosure also provide a display panel 10. The display panel 10 includes a second light-emitting unit 2. The second light-emitting unit 2 includes a third light-emitting layer 23 and a second light-emitting layer 21 which are arranged in layers, and the light-emitting colors of the third light-emitting layer 23 and the second light-emitting layer 21 are different. The third light-emitting layer 23 and the second light-emitting layer 21 are configured to independently emit light and not emit light at the same time.

[0225] In some embodiments of the present disclosure, the number of layers of at least one of the third light-emitting layer 23 and the second light-emitting layer 21 is greater than or equal to 2.

[0226] The second light emitting unit 2 here can refer to the second light emitting unit 2 described above. In this embodiment, each light emitting unit 02 on the display panel 10 is a second light emitting unit 2. When the display panel 10 displays a picture, the third light emitting layer 23 is used for light emitting display, which is conducive to reducing the power consumption of the display panel 10, and the second light emitting layer 21 is used for light emitting display, which can make the display panel 10 achieve wider color gamut display.

[0227] For details, refer to the description of the display panel 10 and the second light emitting unit 2 above, which will not be repeated here.

[0228] In some embodiments, the display panel 10 further comprises a third light emitting unit. The third light emitting unit comprises at least two layers of fourth light emitting layers and a fifth light emitting layer which are stacked. The at least two layers of fourth light emitting layers mix colors to emit white light, and the wavelength range of the light emitted by the fifth light emitting layer is the same as that of the light emitted by one of the at least two layers of fourth light emitting layers. The at least two layers of fourth light emitting layers are configured to emit light independently and simultaneously, and the fifth light emitting layer is configured to emit light independently and not simultaneously with the fourth light emitting layer having the same wavelength range of light emitted thereby.

[0229] When the third light emitting unit emits light, the at least two layers of fourth light emitting layers are lit simultaneously, and the light emitted by each fourth light emitting layer mixes colors to make the third light emitting unit emit white light.

[0230] For example, the at least two layers of fourth light emitting layers included in the third light emitting unit can be a yellow light emitting layer and a blue light emitting layer. When the third light emitting unit is lit, the yellow light emitted by the yellow light emitting layer mixes with the blue light emitted by the blue light emitting layer to make the third light emitting unit emit white light.

[0231] When the lifetime of the blue light emitting layer is higher than the light emitting lifetime of the blue light emitting layer, and the lifetime of the yellow light emitting layer is higher than that of the yellow light emitting layer, the white light emitted by the third light emitting unit is a reference color. When the lifetime of the blue light emitting layer is lower than the light emitting lifetime of the blue light emitting layer, and the lifetime of the yellow light emitting layer is higher than that of the yellow light emitting layer, the white light emitted by the third light emitting unit is "warm". When the lifetime of the blue light emitting layer is higher than the light emitting lifetime of the blue light emitting layer, and the lifetime of the yellow light emitting layer is lower than that of the yellow light emitting layer, the white light emitted by the third light emitting unit is "cold".

[0232] That is, when the lifetime of at least one layer of fourth light emitting layer in the third light emitting unit is the first light emitting lifetime, the light emitted by the third light emitting unit appears color deviation (for example, the white light emitted by the third light emitting unit is "warm" or "cold").

[0233] Based on this, in some embodiments of the present disclosure, the third light emitting unit can include one or more fifth light emitting layers by disposing a fifth light emitting layer in the third light emitting unit. One of the fifth light emitting layers has the same wavelength range as the light emitted by one of the fourth light emitting layers. When one of the fourth light emitting layers reaches the light emitting life, the light emitting brightness of the fourth light emitting layer is lower than the set requirement, the brightness of the light emitted by the third light emitting unit is lower than the set brightness, and the color of the light emitted by the third light emitting unit appears color deviation. At this time, the fourth light emitting layer reaching the light emitting life does not emit light and is no longer used for light emitting display, but is replaced by the fifth light emitting layer with the same wavelength range as the light emitted by the fourth light emitting layer. The fifth light emitting layer is lighted, so that the third light emitting unit can still emit white light, and the light emitting brightness of the third light emitting unit can still emit light with the set brightness, and the color of the light emitted by the third light emitting unit has no color deviation.

[0234] By disposing the fifth light emitting layer, the light emitting life of the third light emitting unit can be increased, and the service life of the display panel 10 can be improved.

[0235] In some embodiments, as shown in FIGS. 3 and 4, the display panel 10 further includes a pixel defining layer 3, the pixel defining layer 3 includes a plurality of opening regions K corresponding to the light emitting units 02, each light emitting unit 02 is located in one opening region K, and one of the first light emitting unit 1, the second light emitting unit 2 or the third light emitting unit is disposed in one opening region K. The distance d1 between the effective light emitting areas of any two adjacent light emitting units 02 is less than or equal to 10 μm.

[0236] Exemplarily, as shown in FIGS. 3 and 4, the display panel 10 includes the first light emitting unit 1 and the second light emitting unit 2, one first light emitting unit 1 is disposed in one opening region K, and one second light emitting unit 2 is disposed in one opening region K.

[0237] Exemplarily, the display panel 10 further includes the third light emitting unit, and one third light emitting unit is disposed in one opening region K.

[0238] Exemplarily, the distance d1 between the effective light emitting areas of any two adjacent light emitting units 02 can be 7 μm, 8 μm or 10 μm.

[0239] Exemplarily, in the preparation process of the display panel 10, the light emitting unit can be prepared by using a “evaporation + photolithography” process.

[0240] In this way, in the preparation process of the display panel, a color of light emitting material can be first deposited on the back plate 01 in an integral layer, covering all the sub-pixel P regions; then, the rest of the light emitting material except the target area is removed through a photolithography process, thereby forming a light emitting layer of a color of light on the back plate 01. The above-mentioned “deposition + photolithography” process steps are cycled, thereby forming light emitting layers of multiple different colors of light in the display panel 10.

[0241] In some embodiments, as shown in FIGS. 3 and 4, the pixel defining layer 3 can include a first portion 31 and a second portion 32, the first portion 31 being closer to the back plate 01 than the second portion 32, and in the orthographic projection to the back plate 01, the second portion 32 surrounds the first portion 31.

[0242] A cross section of the pixel defining layer 3 along an opening region K of the pixel defining layer 3 perpendicular to the plane of the back plate 01 is shown in FIGS. 3 and 4, and in the cross-sectional view, the first portion 31 and the second portion 32 are collectively inverted trapezoidal.

[0243] For example, in the cross-sectional view obtained by taking a cross section of the pixel defining layer 3 along an opening region K of the pixel defining layer 3 perpendicular to the plane of the back plate 01, the first portion 31 can be rectangular, trapezoidal, or inverted trapezoidal, etc.; and the second portion 32 can be rectangular, trapezoidal, or inverted trapezoidal, etc.

[0244] For example, the first portion 31 and the second portion 32 can be formed by the same patterning process, or can be formed by two times of patterning processes.

[0245] Embodiments of the present disclosure also provide a driving method of the display panel 10. The driving method can be used to drive the display panel 10 provided in any of the above-mentioned embodiments.

[0246] In some embodiments, the display panel 10 includes at least two layers of first light emitting layers 11 arranged in a stack. The driving method of the display panel 10 includes: driving different first light emitting layers 11 in the first light emitting unit 1 to emit light in time division.

[0247] In some embodiments, the display panel 10 further includes a second light emitting unit 2; the second light emitting unit 2 includes a second light emitting layer 21; the center wavelength of the light emitted by the second light emitting layer 21 and the center wavelength of the light emitted by the third light emitting layer 23 have a difference of less than 70 nm. The driving method of the display panel 10 further includes: driving the second light emitting layer 21 and the first light emitting layer 11 to emit light in time division.

[0248] For example, the second light emitting unit 2 is arranged adjacent to the first light emitting unit 1.

[0249] Exemplarily, in the case that the second light emitting unit 2 comprises multiple layers (two or more) of the second light emitting layer 21, the driving method of the display panel 10 further comprises:

[0250] The different second light emitting layers 21 in the second light emitting unit 2 are driven to emit light in time division.

[0251] In some embodiments, the second light emitting unit 2 further comprises a third light emitting layer 23, and the wavelength range of the light emitted by the third light emitting layer 23 is the same as the wavelength range of the light emitted by the first light emitting layer 11. Based on this, the driving method of the display panel 10 further comprises: driving one layer of the third light emitting layer 23 to emit light at the same time as the first light emitting layer 11, and driving the third light emitting layer 23 and the second light emitting layer 21 to emit light in time division.

[0252] Exemplarily, the third light emitting layer 23 and the second light emitting layer 21 are arranged in a stack.

[0253] In some embodiments, driving one layer of the third light emitting layer 23 in the second light emitting unit 2 to emit light at the same time as the first light emitting layer 11 comprises:

[0254] Driving the third light emitting layer 23 to emit light at a second brightness L2 at the same time as the first light emitting layer 11 is driven to emit light at a first brightness L1, and the second brightness L2 is less than the first brightness L1, L2 < L1.

[0255] Exemplarily, in the case that the second light emitting unit 2 comprises multiple layers (two or more) of the third light emitting layer 23, the driving method of the display panel 10 further comprises: driving the different third light emitting layers 23 in the second light emitting unit 2 to emit light in time division.

[0256] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A display panel, comprising: a first light-emitting unit; The first light emitting unit includes: At least two first light-emitting layers are stacked, and the wavelength range of light emitted by the at least two first light-emitting layers is the same; At least three first electrodes, the at least three first electrodes and the at least two first light-emitting layers are alternately stacked, and each first light-emitting layer is located between two adjacent first electrodes; Among them, among the two first electrodes adjacent to each other on both sides of each first light-emitting layer, at least one first electrode is independently arranged in the electrode layer where it is located, and the at least two first light-emitting layers are configured to emit light independently and not at the same time.

2. The display panel according to claim 1, wherein The display panel further includes: a second light emitting unit disposed adjacent to the first light emitting unit; the second light emitting unit includes: a second light-emitting layer, wherein the difference between the central wavelength of light emitted by the second light-emitting layer and the central wavelength of light emitted by the first light-emitting layer is less than 70 nm; a second electrode stacked with the second light-emitting layer; and a second electrode is disposed adjacent to each of two sides of the second light-emitting layer along the stacking direction; Among them, among the two second electrodes adjacent to each other on both sides of the second light-emitting layer, at least one second electrode is independently arranged in the electrode layer where it is located; the first light-emitting layer and the second light-emitting layer are configured to emit light independently and not at the same time.

3. The display panel according to claim 2, wherein: The hue of the light emitted by the first light-emitting layer and the second light-emitting layer is red, and the wavelength of light emitted by the second light-emitting layer is longer than the wavelength of light emitted by the first light-emitting layer; or, The hue of the light emitted by the first light-emitting layer and the second light-emitting layer is green, and the wavelength of light emitted by the first light-emitting layer is longer than the wavelength of light emitted by the second light-emitting layer; or, The hue of the light emitted by the first light-emitting layer and the second light-emitting layer is blue, and the wavelength of light emitted by the first light-emitting layer is longer than the wavelength of light emitted by the second light-emitting layer.

4. The display panel according to claim 2 or 3, wherein: The brightness of the light-emitting color of the second light-emitting layer is lower than the brightness of the light-emitting color of the first light-emitting layer.

5. The display panel according to any one of claims 2 to 4, wherein: The luminous efficiency of the first light-emitting layer is higher than that of the second light-emitting layer.

6. The display panel according to any one of claims 2 to 5, wherein: The second light emitting unit further includes: a third light-emitting layer stacked with the second light-emitting layer, with one second electrode disposed adjacent to each side of the third light-emitting layer along the stacking direction; and a difference between a center wavelength of light emitted by the third light-emitting layer and a center wavelength of light emitted by the second light-emitting layer being less than 70 nm; Among them, at least one of the two second electrodes adjacent to each other on both sides of the third light-emitting layer is independently arranged in the electrode layer where it is located; the third light-emitting layer and the second light-emitting layer are configured to emit light independently and not at the same time.

7. The display panel according to claim 6, wherein: The wavelength range of light emitted by the third light-emitting layer is the same as the wavelength range of light emitted by the first light-emitting layer; The third light-emitting layer and the first light-emitting layer are configured to emit light independently and simultaneously.

8. The display panel according to claim 6 or 7, wherein: The third light-emitting layer is made of the same material as the first light-emitting layer, and one layer of the third light-emitting layer is disposed on the same layer as one layer of the first light-emitting layer.

9. The display panel according to claim 8, wherein: The second light-emitting unit is configured to emit light from a single side, and the third light-emitting layer is closer to the light-emitting side of the second light-emitting unit than the second light-emitting layer.

10. The display panel according to any one of claims 6 to 9, wherein: The second light-emitting unit includes at least two layers of the third light-emitting layer, and the wavelength range of light emitted by the at least two layers of the third light-emitting layer is the same; At least two of the third light-emitting layers are configured to emit light independently and not simultaneously.

11. The display panel according to any one of claims 2 to 10, wherein: The second light-emitting unit includes at least two second light-emitting layers, and the wavelength range of light emitted by the at least two second light-emitting layers is the same; At least two of the second light-emitting layers are configured to emit light independently and not simultaneously.

12. The display panel according to any one of claims 2 to 11, wherein: One of the first light-emitting units is adjacent to at least one of the second light-emitting units.

13. The display panel according to any one of claims 1 to 12, wherein: The display panel further includes: a third light emitting unit; the third light emitting unit includes: At least two fourth light-emitting layers are stacked; the at least two fourth light-emitting layers emit white light by mixing colors; a fifth light-emitting layer, stacked with the at least two fourth light-emitting layers; the fifth light-emitting layer and one of the at least two fourth light-emitting layers emit light in the same wavelength range; The at least two fourth light-emitting layers are configured to emit light independently and simultaneously; the fifth light-emitting layer is configured to emit light independently and not simultaneously with the fourth light-emitting layer having the same wavelength range as the fifth light-emitting layer.

14. The display panel according to any one of claims 2 to 13, wherein: The display panel further includes: The pixel defining layer includes an opening area; one of the first light emitting unit, the second light emitting unit, or the third light emitting unit is disposed in one of the opening areas.

15. A display device comprising: A circuit board, and a display panel according to any one of claims 1 to 14; The circuit board is connected to the display panel.

16. A method for driving a display panel, the display panel comprising at least two stacked first light-emitting layers, the at least two first light-emitting layers emitting light having the same wavelength range; the method comprising: Different first light-emitting layers in the first light-emitting unit are driven in a time-sharing manner to emit light.

17. The method for driving a display panel according to claim 16, wherein: The display panel further includes a second light-emitting unit disposed adjacent to the first light-emitting unit; the second light-emitting unit includes a second light-emitting layer, and a difference between a center wavelength of light emitted by the second light-emitting layer and a center wavelength of light emitted by the first light-emitting layer is less than or equal to the difference; the driving method further includes: The second light-emitting layer and the first light-emitting layer are driven in a time-sharing manner to emit light.

18. The method for driving a display panel according to claim 17, wherein: The second light-emitting unit further includes: a third light-emitting layer stacked with the second light-emitting layer; the wavelength range of light emitted by the third light-emitting layer is the same as the wavelength range of light emitted by the first light-emitting layer; and the driving method further includes: driving a layer of the third light-emitting layer and a layer of the first light-emitting layer to emit light simultaneously; The second light-emitting layer and the third light-emitting layer are driven in a time-sharing manner to emit light.

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