CN116456776B - Array substrate, display panel and display device - Google Patents
Array substrate, display panel and display device Download PDFInfo
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- CN116456776B CN116456776B CN202310481548.1A CN202310481548A CN116456776B CN 116456776 B CN116456776 B CN 116456776B CN 202310481548 A CN202310481548 A CN 202310481548A CN 116456776 B CN116456776 B CN 116456776B
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- 239000000758 substrate Substances 0.000 title claims abstract description 100
- 230000005525 hole transport Effects 0.000 claims description 19
- 238000003475 lamination Methods 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 9
- 230000002035 prolonged effect Effects 0.000 description 9
- 229920001621 AMOLED Polymers 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 5
- 108010001267 Protein Subunits Proteins 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
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Abstract
The disclosure provides an array substrate, a display panel and a display device, wherein in the array substrate, a pixel unit comprises a first subunit and a second subunit, and the first subunit and the second subunit are arranged along the horizontal direction; the first subunit includes at least one red organic light emitting diode and at least one green organic light emitting diode, and the at least one red organic light emitting diode and the at least one green organic light emitting diode are arranged along a vertical direction; the second subunit comprises at least one blue organic light emitting diode, and the at least one blue organic light emitting diode is arranged along the vertical direction; the vertical direction is a stacking direction of the substrate and the organic light emitting layer. In the array substrate disclosed by the invention, the area of the substrate occupied by a single pixel unit is reduced, so that more pixel units can be arranged in the substrate, and the array substrate has higher pixel density, so that the display effect is better improved.
Description
Technical Field
The disclosure relates to the technical field of display, in particular to an array substrate, a display panel and a display device.
Background
An OLED (organic light-Emitting Diode) has been increasingly used in high-performance display as a kind of current-type light Emitting device. Because of its self-luminescence property, AMOLED (Active-matrix organic light-emitting diode) has many advantages such as high contrast, ultra-thin, and flexible compared with LCD (Liquid CRYSTAL DISPLAY).
However, since each pixel unit in the AMOLED must include a red organic light emitting diode, a green organic light emitting diode, and a blue organic light emitting diode, in case that the interval between the above-mentioned diodes cannot be reduced, it is difficult to achieve a higher pixel density in the AMOLED.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides an array substrate, a display panel and a display device.
According to a first aspect of embodiments of the present disclosure, there is provided an array substrate including a substrate and an organic light emitting layer disposed on the substrate in a stacked arrangement, the organic light emitting layer including a plurality of pixel units arranged in an array,
The pixel unit comprises a first subunit and a second subunit, and the first subunit and the second subunit are arranged along the horizontal direction;
the first subunit includes at least one red organic light emitting diode and at least one green organic light emitting diode, the at least one red organic light emitting diode and the at least one green organic light emitting diode being arranged in a vertical direction;
The second subunit includes at least one blue organic light emitting diode, and the at least one blue organic light emitting diode is arranged along the vertical direction;
wherein the vertical direction is a lamination direction of the substrate base plate and the organic light emitting layer.
In an alternative embodiment, the second subunit comprises at least two of the blue organic light emitting diodes, and the at least two of the blue organic light emitting diodes are connected in series.
In an alternative embodiment, the sum of the number of the red organic light emitting diodes and the number of the green organic light emitting diodes in the first subunit is the same as the number of the blue organic light emitting diodes in the second subunit.
In an alternative embodiment, the array substrate includes an external compensation circuit corresponding to the second subunit, the external compensation circuit including a pulse width modulation unit;
the pulse width modulation unit is configured to control input of a driving signal based on a pulse width modulation signal.
In an alternative embodiment, the pulse width modulation unit includes a switching unit between the input of the driving signal and the blue organic light emitting diode;
and the control end of the switching unit is connected with the pulse width modulation signal.
In an alternative embodiment, in each unit display duration of the pixel unit, the switch unit is turned on for a set duration based on the pulse width modulation signal;
Wherein the set time period is greater than or equal to 0.3 times the unit display time period and less than or equal to 0.8 times the unit display time period.
In an alternative embodiment, the number of the red organic light emitting diodes is the same as the number of the green organic light emitting diodes in the first sub-unit.
In an alternative embodiment, the first subunit comprises one of the red organic light emitting diodes and one of the green organic light emitting diodes, and the second subunit comprises two of the blue organic light emitting diodes.
According to a second aspect of embodiments of the present disclosure, there is provided a display panel, the display panel including a package layer, and the array substrate according to the first aspect, the array substrate including a substrate and a plurality of pixel units arranged in an array, the package layer being located on a side of the pixel units away from the substrate.
According to a third aspect of embodiments of the present disclosure, there is provided a display device including a mounting structure, and a display panel as described in the second aspect, the display panel being mounted to the mounting structure.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: in the disclosure, each pixel unit is divided into two sub-units, the first sub-unit comprises at least one red organic light emitting diode and at least one green organic light emitting diode which are vertically arranged, and the second sub-unit comprises at least one blue organic light emitting diode which is vertically arranged, so that the area of a single pixel unit occupying a substrate is reduced, more pixel units can be arranged in the substrate, and the array substrate has higher pixel density, so that the display effect is better improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a partial schematic view of an array substrate shown according to an exemplary embodiment.
Fig. 2 is a schematic diagram of a pixel cell shown according to an exemplary embodiment.
Fig. 3 is a schematic diagram of a first subunit shown in accordance with an exemplary embodiment.
Fig. 4 is a schematic diagram of a second subunit shown in accordance with an exemplary embodiment.
Fig. 5 is a schematic diagram of an external compensation circuit (including a second subunit) according to an example embodiment.
Fig. 6 is a schematic diagram of an external compensation circuit (including a blue organic light emitting diode) according to an example embodiment.
Fig. 7 is a schematic diagram of a display panel shown according to an exemplary embodiment.
Fig. 8 is a schematic diagram of a display device shown according to an exemplary embodiment.
Reference numerals illustrate:
1. A substrate base; 2. an organic light emitting layer; 21. a pixel unit; 211. a first subunit; 2111. a red organic light emitting diode; 2112. a green organic light emitting diode; 211a, a first cathode; 211b, a first electron transport layer; 211c, a red light emitting layer; 211d, a first hole transport layer; 211e, a first anode; 211f, an intermediate electron transport layer; 211g, a second cathode; 211h, a second electron transport layer; 211i, green light emitting layer; 211j, a second hole transport layer; 211k, a second anode; 212. a second subunit; 2121. a blue organic light emitting diode; 212a, a third cathode; 212b, a third electron transport layer; 212c, a first blue light emitting layer; 212d, a third hole transport layer; 212e, a first blue light emitting layer; 212f, a fourth hole transport layer; 212g, a third anode; 30. a pulse width modulation unit; 100. an array substrate; 200. an encapsulation layer; 1000. a display panel; 2000. and (5) a placement structure.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods of some embodiments of the present disclosure.
The embodiment of the disclosure provides an array substrate. In the array substrate, each pixel unit is divided into two sub-units, the first sub-unit comprises at least one red organic light emitting diode and at least one green organic light emitting diode which are arranged along the lamination direction of the substrate and the organic light emitting layer, namely, the red organic light emitting diode and the green organic light emitting diode in the first sub-unit are vertically arranged, and the second sub-unit comprises at least one blue organic light emitting diode which is vertically arranged, so that the area of the substrate occupied by a single pixel unit is reduced, more pixel units can be arranged in the substrate, and the array substrate has higher pixel density, and better display effect is improved.
In a first embodiment, an array substrate is provided. Referring to fig. 1 and 2, the array substrate (array substrate) may include a substrate 1 and an organic light emitting layer 2 stacked on each other, the organic light emitting layer 2 is disposed on the substrate 1, and the organic light emitting layer 2 includes a plurality of pixel units 21 arranged in an array.
The pixel unit 21 may include a first sub-unit 211 and a second sub-unit 212, and the first sub-unit 211 and the second sub-unit 212 may be arranged in a horizontal direction. In the array substrate, the lamination direction of the substrate 1 and the organic light emitting layer 2 may be referred to as a vertical direction. The vertical direction is perpendicular to the horizontal direction.
The first sub-unit 211 may include at least one red organic light emitting diode 2111 and at least one green organic light emitting diode 2112. The at least one red organic light emitting diode 2111 and the at least one green organic light emitting diode 2112 in the first sub-unit 211 may be arranged in a vertical direction. That is, at least one red organic light emitting diode 2111 and at least one green organic light emitting diode 2112 in the first sub-unit 211 are vertically arranged. For example, all the organic light emitting diodes (including all the red organic light emitting diodes 2111 and all the green organic light emitting diodes 2112) in the first sub-unit 211 are vertically arranged. In the first subunit 211, the substrate base area occupied by the first subunit 211 can be reduced better by the vertically arranged organic light emitting diodes.
The dashed boxes in fig. 1 and 2 are for better illustrating the corresponding structures, and the dashed lines are not present in the actual array substrate.
In some embodiments of the present invention, in some embodiments,
Referring to fig. 1 to 3, the first sub-unit 211 may include one red organic light emitting diode 2111 and one green organic light emitting diode 2112, and the red organic light emitting diode 2111 is arranged perpendicular to the green organic light emitting diode 2112. Wherein the red organic light emitting diode 2111 may be located at a side of the green organic light emitting diode 2112 away from the substrate 1. In order to realize the first sub-unit 211 described above, a first cathode 211a, a first electron transport layer 211b (the electron transport layer may also be referred to as a hole blocking layer), a red light emitting layer 211c, a first hole transport layer 211d (the hole transport layer may also be referred to as an electron blocking layer), a first anode 211e, an intermediate electron transport layer 211f, a second cathode 211g, a second electron transport layer 211h, a green light emitting layer 211i, a second hole transport layer 211j, and a second anode 211k may be sequentially disposed in the vertical direction. Wherein, the first cathode 211a is electrically connected with the first anode 211e to ensure that the red light emitting layer 211c emits light normally; the second cathode 211g is electrically connected to the second anode 211k to ensure normal light emission of the green light emitting layer 211 i; the intermediate electron transport layer 211f serves to separate the first anode 211e and the second cathode 211g to avoid interaction between the red light emitting layer 211c and the green light emitting layer 211i, thereby better achieving vertical arrangement of the red organic light emitting diode 2111 and the green organic light emitting diode 2112. In fig. 3, the dotted line with an arrow indicates the signal transmission direction, and it is understood that the red organic light emitting diode 2111 and the green organic light emitting diode 2112 are not connected in series, but emit light individually.
It should be noted that, the first subunit 211 may be configured in other manners besides the foregoing embodiments, which is not limited thereto, so as to better meet different needs of users. In addition, in the first subunit 211, the number of the red organic light emitting diodes 2111 may be set according to the actual requirement, and the specific number thereof may not be limited to better satisfy the different requirements of the user. The number of the green organic light emitting diodes 2112 in the first subunit 211 may also be set according to the actual requirement, and the specific number thereof may not be limited, so as to better meet the different requirements of the user.
Wherein the second subunit 212 may comprise at least one blue organic light emitting diode 2121. At least one blue organic light emitting diode 2121 in the second subunit 212 may be arranged in a vertical direction. That is, at least one blue organic light emitting diode 2121 in the second subunit 212 may be vertically arranged. For example, all of the organic light emitting diodes (i.e., all of the blue organic light emitting diodes 2121) in the second subunit 212 are vertically arranged. In the second subunit 212, the area of the substrate 1 occupied by the second subunit 212 can be reduced better by the vertically arranged organic light emitting diodes.
In some embodiments of the present invention, in some embodiments,
Referring to fig. 1, 2 and 4, the second sub-unit 212 may include two blue organic light emitting diodes 2121 vertically arranged, and the two blue organic light emitting diodes 2121 are connected in series. In order to realize the second sub-unit 212, a third cathode 212a, a third electron transport layer 212b, a first blue light emitting layer 212c, a third hole transport layer 212d, a second blue light emitting layer 212e, a fourth hole transport layer 212f, and a third anode 212g may be sequentially disposed in the vertical direction. The third cathode 212a is electrically connected to the third hole transport layer 212d, and the third hole transport layer 212d is electrically connected to the fourth hole transport layer 212f, so that the two blue organic light emitting diodes 2121 are connected in series, and the first blue light emitting layer 212c and the second blue light emitting layer 212e are ensured to emit light normally, so that vertical arrangement of the two blue organic light emitting diodes 2121 is better achieved. In fig. 4, the dotted line with an arrow indicates the signal transmission direction, and it can be seen that two blue organic light emitting diodes 2121 are connected in series.
It should be noted that, in addition to the arrangement of the foregoing embodiments, the subunit may also adopt other manners, which are not limited thereto, so as to better meet different requirements of users. In addition, in the second subunit 212, the number of the blue organic light emitting diodes 2121 may be set according to actual needs, and the specific number thereof may not be limited, so as to better meet different needs of users.
In the related art array substrate, each pixel unit 21 may include a red organic light emitting diode 2111, a green organic light emitting diode 2112 and a blue organic light emitting diode 2121 which are horizontally arranged, that is, each pixel unit 21 occupies at least a region corresponding to three organic light emitting diodes in the substrate 1. In the array substrate of the present disclosure, each pixel unit 21 may include a first sub-unit 211 and a second sub-unit 212 that are horizontally arranged, and the red organic light emitting diode 2111 and the green organic light emitting diode 2112 in the first sub-unit 211 are vertically arranged, and the blue organic light emitting diode 2121 in the second sub-unit 212 is vertically arranged, that is, in the array substrate of the present disclosure, each pixel unit 21 may occupy the corresponding area of two organic light emitting diodes in the substrate 1.
In the array substrate, each pixel unit 21 is divided into two sub-units, the first sub-unit 211 comprises at least one red organic light emitting diode 2111 and at least one green organic light emitting diode 2112 which are vertically arranged, the second sub-unit 212 comprises at least one blue organic light emitting diode 2121 which is vertically arranged, so that the area of the single pixel unit 21 occupying the substrate 1 is reduced, more pixel units 21 can be arranged in the substrate 1, and the array substrate has higher pixel density, so that the display effect is better improved.
In a second embodiment, an array substrate is provided. Referring to fig. 1 and 2, in the array substrate, the second subunit 212 includes at least two blue organic light emitting diodes 2121, and the at least two blue organic light emitting diodes 2121 are connected in series, so that a lower driving current can be used to achieve higher brightness, so as to improve the lifetime of the blue organic light emitting diodes 2121.
Wherein the sum of the numbers of red organic light emitting diodes 2111 and green organic light emitting diodes 2112 in the first subunit 211 may be the same as the number of blue organic light emitting diodes 2121 in the second subunit 212. That is, in each pixel unit 21, the number of organic light emitting diodes in the first subunit 211 is the same as the number of organic light emitting diodes in the second subunit 212.
Thus, in the same pixel unit 21, in the case where the luminance ratio of red, green, and blue is the same, since the number of blue organic light emitting diodes 2121 is greater than the number of red organic light emitting diodes 2111, and the number of blue organic light emitting diodes 2121 is greater than the number of green organic light emitting diodes 2112, and all of the blue organic light emitting diodes 2121 are vertically arranged, the luminance of a single blue organic light emitting diode 2121 can be set lower.
It should be noted that, in the array substrate of the AMOLED (Active-matrix organic light-emitting diode, active matrix organic light emitting diode or Active matrix organic light emitting diode), the lifetime of the blue organic light emitting diode 2121 may directly affect the lifetime of the array substrate because the lifetime and the light emitting efficiency of the blue organic light emitting diode 2121 are poor. In the array substrate of the present disclosure, the blue organic light emitting diode 2121 has a lower brightness, so that the lifetime of the blue organic light emitting diode 2121 can be prolonged, thereby prolonging the lifetime of the array substrate.
In the first sub-unit 211, the number of the red organic light emitting diodes 2111 and the number of the green organic light emitting diodes 2112 may be the same. That is, in each pixel unit 21, the number of red organic light emitting diodes 2111 is the same as the number of green organic light emitting diodes 2112.
Thus, in the same pixel unit 21, the luminance of the single red organic light emitting diode 2111 and the luminance of the single green organic light emitting diode 2112 may be the same under the condition that the ratio of the red luminance and the green luminance is the same, so that the service lives of the red organic light emitting diode 2111 and the green organic light emitting diode 2112 may be better balanced, so as to better prolong the service life of the whole array substrate.
Note that, when the sum of the numbers of the red organic light emitting diodes 2111 and the green organic light emitting diodes 2112 in the first subunit 211 is the same as the number of the blue organic light emitting diodes 2121 in the second subunit 212, and the number of the red organic light emitting diodes 2111 and the number of the green organic light emitting diodes 2112 in the first subunit 211 are the same, it is explained that in each pixel unit 21, the number of the red organic light emitting diodes 2111 is the same as the number of the green organic light emitting diodes 2112, and the number of the blue organic light emitting diodes 2121 is twice the number of the red organic light emitting diodes 2111.
Thus, in the same pixel unit 21, under the condition that the brightness ratio of red, green and blue is the same, the brightness of the single red organic light emitting diode 2111 and the brightness of the single green organic light emitting diode 2112 may be the same, and the brightness of the single blue organic light emitting diode 2121 may be set lower, so that not only the service lives of the red organic light emitting diode 2111 and the green organic light emitting diode 2112 may be better balanced, but also the service life of the blue organic light emitting diode 2121 may be further prolonged, thereby better prolonging the service life of the entire array substrate.
In some embodiments of the present invention, in some embodiments,
Each pixel unit 21 may include a first sub-unit 211 and a second sub-unit 212 horizontally arranged. The first sub-unit 211 may include one red organic light emitting diode 2111 and one green organic light emitting diode 2112, and the second sub-unit 212 may include two blue organic light emitting diodes 2121. One red organic light emitting diode 2111 and one green organic light emitting diode 2112 in the first sub-unit 211 may be vertically arranged. The two blue organic light emitting diodes 2121 in the second subunit 212 may be vertically arranged. The two blue organic light emitting diodes 2121 in the second subunit 212 may be connected in series. In this embodiment, by serially connecting the blue organic light emitting diodes 2121, a relatively high brightness can be achieved by a relatively small driving current, and by horizontally arranging the first subunit 211 and the second subunit 212 and vertically arranging the organic light emitting diodes in each subunit, the brightness of a single blue organic light emitting diode 2121 can be better reduced, so that the driving current of the blue organic light emitting diode 2121 is better reduced, the service life of the blue organic light emitting diode 2121 is better prolonged, and the overall service life of the array substrate is better prolonged. In addition, through the vertical arrangement of the organic light emitting diodes, the area of the substrate 1 occupied by the single pixel unit 21 can be reduced to a certain extent, so that the pixel density of the array substrate is better improved, and the display effect is further improved.
Because the light emitting lifetime of the blue organic light emitting diode 2121 is generally low, the blue organic light emitting diode 2121 adopts a serial connection mode, so that the blue organic light emitting diode 2121 can achieve the required brightness with a small driving current, thereby improving the lifetime of the blue organic light emitting diode 2121. In addition, since the red organic light emitting diode 2111 and the green organic light emitting diode 2112 have high light emitting efficiency and a material life thereof is long, the red organic light emitting diode 2111 and the green organic light emitting diode 2112 can emit light in a single device. However, since the blue organic light emitting diode 2121 has been configured in series, it is arranged in a vertical arrangement, and since the red organic light emitting diode 2111 and the green organic light emitting diode 2112 are themselves thin, they can transmit light, for example, the light emitted from the green organic light emitting diode 2112 can transmit the red organic light emitting diode 2111, and on the basis of this, the red organic light emitting diode 2111 and the green organic light emitting diode 2112 can be converted from a horizontal arrangement to a vertical arrangement. So configured, when green color is desired to be displayed, the luminance of the red organic light emitting diode 2111 and the blue organic light emitting diode 2121 may be set low so that the pixel unit 21 normally displays green color. In this embodiment, by the above arrangement, the area occupied by the single pixel unit 21 can be reduced to 2/3 of the original area, and a high pixel density can be realized more easily.
It should be noted that, other arrangements of the pixel units 21 besides the arrangement of the above embodiments may be adopted, and this is not limited to the above embodiments, so as to better meet different requirements of users.
In the array substrate, the driving current of the blue organic light emitting diode 2121 can be reduced better, so that the service life of the blue organic light emitting diode 2121 is prolonged better, and the whole service life of the array substrate is prolonged better. The area of the substrate 1 occupied by the single pixel unit 21 can be reduced to a certain extent, so that the pixel density of the array substrate is better improved, and the display effect is further improved.
In a third embodiment, an array substrate is provided. Referring to fig. 1,2 and 5, the array substrate may include an external compensation circuit corresponding to the second sub-unit 212. The external compensation circuit may include a pulse width modulation unit 30. The pulse width modulation unit 30 may be configured to control the input of the driving signal based on the pulse width modulation signal. The driving signal may include a driving current or a driving voltage, which is not limited.
Note that, the direction indicated by the arrow in fig. 5 may refer to the transmission direction of the driving signal.
The pulse width modulation unit 30 may include a switching unit. The control end of the switch unit is connected with the pulse width modulation signal. The switching unit is located between the input end of the driving signal and the blue organic light emitting diode 2121, and the pulse width modulation signal can control the transmission of the driving signal from the input end to the blue organic light emitting diode 2121 through the switching unit.
When the pwm signal can control the switch unit to be turned on, the switch unit can be turned on after the pwm signal is received by the control unit of the switch unit, the driving signal can be input to the external compensation circuit, and the blue organic light emitting diode 2121 electrically connected to the external compensation circuit can be turned on.
When the pwm signal can control the switch unit to be turned off, the switch unit can be turned off after the pwm signal is received by the control unit of the switch unit, and the driving signal cannot be input to the external compensation circuit, so that the blue organic light emitting diode 2121 electrically connected to the external compensation circuit cannot be turned on.
Therefore, by setting a proper pulse width modulation signal, the lighting duration of the blue organic light emitting diode 2121 can be well controlled, so that the blue organic light emitting diode 2121 is better prevented from being always on, and the service life of the blue organic light emitting diode 2121 can be better prolonged.
It should be noted that the switching unit may be a switching diode, and the switching diode may be a TFT (thin film transistor), and the switching unit may also be other devices, which are not limited in this way, so as to better meet different requirements of users.
Wherein, in each unit display period of the pixel unit 21, the switching unit is turned on for a set period based on the pulse width modulation signal. The unit display duration may refer to one frame. The unit display period when the time length is set to be greater than or equal to 0.3 times and less than or equal to 0.8 times.
The corresponding relation between the set time length and the unit display time length can be set according to practical conditions, and is not limited to the practical conditions, so that different requirements of users can be better met. For example, the set period of time may be equal to 0.5 times the unit display period of time.
It should be noted that, in the array substrate, the number of the pixel units 21 in the array substrate is increased due to the increased pixel density, and the placement space of the circuit for driving the organic light emitting diode in the array substrate is relatively reduced. In addition, since the blue organic light emitting diodes 2121 in the single pixel unit 21 are connected in series, the light emission luminance thereof is high, and the light emission luminance of the red organic light emitting diode 2111 and the green organic light emitting diode 2112 is relatively low, an external compensation circuit having the pulse width modulation unit 30 is employed as the external compensation circuit of the blue organic light emitting diode 2121 in the array substrate, and an external compensation circuit not having the pulse width modulation unit 30 is employed as the compensation circuit of the red organic light emitting diode 2111 and the green organic light emitting diode 2112 to better match the luminance ratios of red, green, and blue, i.e., to achieve the target white point.
With the above arrangement of the different external compensation circuits, under the condition that the brightness ratio of red, green and blue is the same, the driving current of the blue organic light emitting diode 2121 is made to be as consistent as possible with the driving current of the red organic light emitting diode 2111 (or the green organic light emitting diode 2112), but since the blue organic light emitting diode 2121 is connected in series, if DC dimming is adopted (i.e. brightness is controlled by adjusting voltage or current, that is, changing power), external compensation is difficult due to very low current, therefore, the external compensation circuit of the blue organic light emitting diode 2121 can be additionally provided with the pulse width modulation unit 30, dimming is performed by the pulse width modulation unit 30 (that is, the effect of continuously displaying is achieved by controlling the light emitting diode to alternately flash (that is, light and light off alternately) at a certain frequency, so as to better perform external compensation and prolong the service life of the blue organic light emitting diode 2121. In contrast, the red organic light emitting diode 2111 and the green organic light emitting diode 2112 may be externally compensated using an external compensation circuit for DC dimming.
In some embodiments of the present invention, in some embodiments,
The external compensation circuit of the blue organic light emitting diode 2121 may include a first transistor T1, a second transistor T2, a first capacitor C1, a second capacitor Coled, a third transistor T3, a blue organic light emitting diode BOLED, and a fourth transistor T4, as shown in fig. 6, wherein the second capacitor Coled may be a parasitic capacitance of the blue organic light emitting diode BOLED. The gate of the fourth transistor T4 is connected to the pulse width modulation signal PWM, thereby constituting a pulse width modulation unit.
The gate of the first transistor T1 is connected to the Scan signal Scan, the drain of the first transistor T1 is electrically connected to the gate of the second transistor T2, and the source of the first transistor T1 is connected to the data signal Vdata. The source electrode of the fourth transistor T4 is connected to the first voltage signal PVDD, which may be a driving signal of the blue organic light emitting diode BOLED, and the first voltage signal PVDD may be an anode voltage corresponding to the blue organic light emitting diode BOLED. The gate of the fourth transistor T4 is connected to the PWM signal, and the drain of the fourth transistor T4 is electrically connected to the source of the second transistor T2. The drain of the second transistor T2 is electrically connected to the input terminal of the blue organic light emitting diode 2121. The first end of the first capacitor C1 is electrically connected to the drain of the first transistor T1, and the second end of the first capacitor C2 is electrically connected to the drain of the second transistor T2. The gate of the third transistor T3 is connected to the detection signal Sensor, which may be a touch detection signal. The drain of the third transistor T3 is electrically connected to the drain of the second transistor T2. The output end of the blue organic light emitting diode BOLED is connected to the second voltage signal PVEE, and the second voltage signal PVEE may be a cathode voltage corresponding to the blue organic light emitting diode BOLED.
In this embodiment, the pulse width modulation signal PWM may control the duration of the fourth transistor T4 in the on state to be 0.5 frame and control the duration of the fourth transistor T4 in the off state to be 0.5 frame in each frame, so as to reduce the light emitting duration of the blue organic light emitting diode BOLED in each frame, thereby prolonging the lifetime of the blue organic light emitting diode BOLED.
It should be noted that the external compensation circuit may be other forms besides the above-mentioned embodiments, and is not limited thereto, so as to better satisfy different requirements of users.
In the array substrate, the pulse width adjusting unit is arranged, so that the blue organic light emitting diode 2121 can be better subjected to external compensation, the service life of the blue organic light emitting diode 2121 is prolonged under the condition that the brightness requirement of the blue organic light emitting diode 2121 is guaranteed, and further, the whole service life of the array substrate is prolonged under the condition that the normal display of the array substrate is guaranteed, and the use experience is improved.
In a fourth embodiment, a display panel is provided. Referring to fig. 1 and 7, the display panel may include a package layer 200, and the above-mentioned array substrate 100, where the array substrate 100 includes a substrate 1 and a plurality of pixel units 21 arranged in an array, and the package layer 200 is located on a side of the pixel units 21 away from the substrate.
In the display panel, by arranging the array substrate 100, the area occupied by a single pixel unit 21 on the substrate 1 is reduced, so that more pixel units 21 can be arranged in the substrate 1, and the array substrate 100 has higher pixel density, so that the display effect of the display panel is better improved, and the quality of the display panel is improved.
In a fifth embodiment, a display device is provided. The display device may be a display screen. The display device may be a mobile phone, a computer, a television, a wearable device, or the like provided with a display screen, which is not limited thereto.
As shown in fig. 8, the display device may be provided with a structure 2000, and the display panel 1000 described above. The mounting structure 2000 may include a housing or a middle frame, and the display panel 1000 may be mounted to the mounting structure 2000 to ensure reliable fixing of the display panel 1000.
The display device can well improve the pixel density by arranging the display panel 1000, so as to better improve the display effect of the display device and improve the quality of the display device.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (9)
1. An array substrate comprises a substrate and an organic light-emitting layer, wherein the substrate and the organic light-emitting layer are arranged in a stacked manner, the organic light-emitting layer is arranged on the substrate and comprises a plurality of pixel units which are arranged in an array manner,
The pixel unit comprises a first subunit and a second subunit, and the first subunit and the second subunit are arranged along the horizontal direction;
the first subunit includes at least one red organic light emitting diode and at least one green organic light emitting diode, the at least one red organic light emitting diode and the at least one green organic light emitting diode being arranged in a vertical direction;
The second subunit includes at least one blue organic light emitting diode, and the at least one blue organic light emitting diode is arranged along the vertical direction;
Wherein the vertical direction is a lamination direction of the substrate base plate and the organic light emitting layer;
In the vertical direction, the first subunit is sequentially provided with a first cathode, a first electron transport layer, a red light emitting layer, a first hole transport layer, a first anode, an intermediate electron transport layer, a second cathode, a second electron transport layer, a green light emitting layer, a second hole transport layer and a second anode;
The second subunit comprises two blue organic light emitting diodes, and the two blue organic light emitting diodes are connected in series;
in the vertical direction, the second subunit is sequentially provided with a third cathode, a third electron transport layer, a first blue light emitting layer, a third hole transport layer, a second blue light emitting layer, a fourth hole transport layer and a third anode; the third cathode is electrically connected with the third hole transport layer, and the third hole transport layer is electrically connected with the fourth hole transport layer so as to connect the two blue organic light emitting diodes in series.
2. The array substrate of claim 1, wherein a sum of the number of the red organic light emitting diodes and the number of the green organic light emitting diodes in the first sub-unit is the same as the number of the blue organic light emitting diodes in the second sub-unit.
3. The array substrate of claim 1, wherein the array substrate comprises an external compensation circuit corresponding to the second subunit, the external compensation circuit comprising a pulse width modulation unit;
the pulse width modulation unit is configured to control input of a driving signal based on a pulse width modulation signal.
4. The array substrate of claim 3, wherein the pulse width modulation unit comprises a switching unit between an input of the driving signal and the blue organic light emitting diode;
and the control end of the switching unit is connected with the pulse width modulation signal.
5. The array substrate according to claim 4, wherein in each unit display period of the pixel unit, the switching unit is turned on for a set period of time based on the pulse width modulation signal;
Wherein the set time period is greater than or equal to 0.3 times the unit display time period and less than or equal to 0.8 times the unit display time period.
6. The array substrate of any one of claims 1 to 5, wherein the number of the red organic light emitting diodes is the same as the number of the green organic light emitting diodes in the first sub-unit.
7. The array substrate of any one of claims 1-5, wherein the first sub-unit comprises one of the red organic light emitting diodes and one of the green organic light emitting diodes, and the second sub-unit comprises two of the blue organic light emitting diodes.
8. A display panel comprising a packaging layer and an array substrate according to any one of claims 1-7, the array substrate comprising a substrate and a plurality of pixel cells arranged in an array, the packaging layer being located on a side of the pixel cells remote from the substrate.
9. A display device comprising a mounting structure, and the display panel of claim 8 mounted to the mounting structure.
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