CN108899343B - Organic electroluminescent device and display method thereof - Google Patents
Organic electroluminescent device and display method thereof Download PDFInfo
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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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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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
- H10K59/352—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels the areas of the RGB subpixels being different
Abstract
The invention relates to the technical field of display, and discloses an organic electroluminescent device and a display method thereof. That is, when the pixel unit is lighted, the lighted number of the blue sub-pixel unit can be freely selected. When the blue light emitting diode is specifically applied, under the low-voltage driving, two or more blue light sub-pixel units can be simultaneously lightened, the blue light emitting brightness is improved, the light emitting efficiency difference between blue light and red light and green light under different brightness is reduced, and the problem of color cast is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic electroluminescent device and a display method thereof.
Background
An Organic Light Emitting Display (abbreviated as OLED) is an active Light Emitting Display device, and is expected to become the next generation of mainstream flat panel Display technology due to its advantages of simple preparation process, low cost, high contrast, wide viewing angle, low power consumption, and the like, and is one of the most concerned technologies in the flat panel Display technology at present.
Fig. 1 shows a voltage-luminance graph of RGB three-color sub-pixels in a pixel juxtaposition type full-color display device. As can be seen from the figure, in the conventional OLED display device, the lighting voltages of the RGB three-color sub-pixels are not uniform. Specifically, the lighting voltage of the blue sub-pixel is greater than the lighting voltage of the green sub-pixel and greater than the lighting voltage of the red sub-pixel. In practical application, the blue photon pixels have large efficiency difference under different driving voltage conditions. Namely, under the high-voltage driving, the blue sub-pixel has higher luminous efficiency; under the low-voltage driving, the blue sub-pixel has lower luminous efficiency. However, the driving voltage of the red sub-pixel and the green sub-pixel is relatively low, and the red sub-pixel and the green sub-pixel can emit light normally under low voltage driving, so that the light emitting efficiency of the red sub-pixel and the green sub-pixel is higher than that of the blue sub-pixel under the condition of low gray scale, and the screen body is prone to color cast (red cast).
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is that in the prior art, the OLED display is prone to color cast.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention provides an organic electroluminescent device which comprises a plurality of pixel units distributed in an array mode, wherein each pixel unit comprises a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit, the number of the blue sub-pixel units is at least two, and the absolute value of the difference value between the green light luminous efficiency and the blue light luminous efficiency in each pixel unit is not larger than a first preset value.
Optionally, the first preset value is 164 cd/a.
Optionally, the number of the blue light sub-pixel units is two, and the two blue light sub-pixel units are respectively a first blue light sub-pixel unit and a second blue light sub-pixel unit, and the luminescent materials in the first blue light sub-pixel unit and the second blue light sub-pixel unit are fluorescent materials.
Optionally, the areas of the sub-pixel units are equal.
Optionally, the light emitting material in the green sub-pixel unit is a phosphorescent material or a fluorescent material; and the luminescent material in the red sub-pixel unit is a phosphorescent material or a fluorescent material.
The embodiment of the invention also provides a display method of the organic electroluminescent device, which comprises the following steps:
providing an organic electroluminescent device, wherein the organic electroluminescent device comprises a plurality of pixel units distributed in an array, each pixel unit comprises a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit, the number of the blue sub-pixel units is at least two, and each blue sub-pixel unit can be independently driven;
and judging the starting number of the blue photon pixels according to the requirement on the brightness value of the blue photon pixels.
Optionally, the number of the blue light sub-pixel units is two, and the two blue light sub-pixel units are respectively a first blue light sub-pixel unit and a second blue light sub-pixel unit, and the luminescent materials in the first blue light sub-pixel unit and the second blue light sub-pixel unit are fluorescent materials.
Optionally, the step of determining the number of the turned-on blue sub-pixels according to the requirement on the brightness value of the blue sub-pixels includes:
acquiring a brightness value requirement of the blue sub-pixel;
judging whether the brightness value is larger than a second preset value or not;
when the brightness value is smaller than or equal to the second preset value, starting the first blue sub-pixel unit and the second blue sub-pixel unit;
and when the brightness value is larger than the second preset value, starting the first blue sub-pixel unit or the second blue sub-pixel unit.
Optionally, the second preset value is 10cd/m2～100cd/m2。
The technical scheme of the invention has the following advantages:
in the organic electroluminescent device provided by the embodiment of the invention, the number of the blue sub-pixel units in each pixel unit is at least two, and each sub-pixel unit is driven independently. That is, when the pixel unit is lighted, the lighted number of the blue sub-pixel unit can be freely selected.
In specific application, the blue sub-pixel unit has low luminous efficiency under low-voltage driving, which easily causes color cast. At the moment, two or more blue sub-pixel units can be lightened simultaneously, so that the blue light brightness is improved, the luminous efficiency difference between blue light and red light and green light under different brightness is reduced, and the problem of color cast is solved. Under the high-voltage driving, the light emitting efficiency of the blue sub-pixel unit is improved, and at the moment, only one blue sub-pixel unit can be lightened. Namely, the organic electroluminescent device with the structure can light different numbers of blue sub-pixel units according to different conditions, and the poor luminous efficiency between blue light and red light and between green light is reduced as much as possible, so that the purpose of reducing color cast is achieved.
In the organic electroluminescent device provided by the embodiment of the present invention, the number of the blue sub-pixel units is two, and the two blue sub-pixel units are respectively a first blue sub-pixel unit and a second blue sub-pixel unit, and the luminescent materials in the first blue sub-pixel unit and the second blue sub-pixel unit are fluorescent materials. On one hand, under the low-voltage driving, the blue light emitting efficiency can be improved by simultaneously lightening the first blue light sub-pixel unit and the second blue light sub-pixel unit, and the purpose of reducing color cast is realized; on the other hand, the fluorescent material has a narrow spectrum, so that the fluorescent material is used as a luminescent material, the color gamut area is increased, the display quality is improved, the cost of the fluorescent material is low, and the preparation cost is reduced.
In the organic electroluminescent device provided by the embodiment of the invention, the areas of the sub-pixel units are equal. Because the number of the blue light sub-pixel units in the pixel unit of the organic electroluminescent device is at least two, the total luminous area of the blue light is certainly larger than the luminous area of the red light and the luminous area of the green light, thereby increasing the luminous area of the blue light, further making up the defect of low luminous efficiency of the blue light under low voltage and reducing color cast.
The display method of the organic electroluminescent device provided by the embodiment of the invention comprises the following steps of firstly providing the organic electroluminescent device, wherein the organic electroluminescent device comprises a plurality of pixel units distributed in an array manner, each pixel unit comprises a red photon pixel unit, a green light sub-pixel unit and a blue light sub-pixel unit, the number of the blue light sub-pixel units is at least two, and each sub-pixel unit can be independently driven; and then judging the starting number of the blue sub-pixels according to the brightness value requirement of the blue sub-pixels.
Namely, by the display method, the number of the blue sub-pixel units to be turned on can be freely selected according to the brightness value requirement of the blue sub-pixel units, so that the actual brightness requirement of blue light can be met. Especially, the luminous efficiency of blue light under low brightness is improved, and then the luminous efficiency of the blue light is matched with that of the red light and the green photon pixel unit, and the problem of color cast caused by low luminous efficiency of the blue light in the traditional low-voltage driving is solved.
The method for displaying an organic electroluminescent device according to an embodiment of the present invention includes the following steps: acquiring the brightness value requirement of the blue sub-pixel; judging whether the brightness value is larger than a second preset value or not; when the brightness value is smaller than or equal to a second preset value, starting the first blue light sub-pixel unit and the second blue light sub-pixel unit; and when the brightness value is greater than a second preset value, starting the first blue sub-pixel unit or the second blue sub-pixel unit.
Since the conventional blue light has a low luminous efficiency at low voltage and low luminance, and the luminous efficiencies of the red light and the green light are kept normal at low voltage and low luminance, the color shift problem is liable to occur. In the method, the brightness value requirement is compared with the preset value, so that the two blue light sub-pixel units are simultaneously started in a low-brightness state to improve the blue light luminous efficiency and prevent color cast; in a high brightness state, only one blue sub-pixel unit is started to adapt to the luminous efficiency of red light and green light and reduce color cast. The method is simple, convenient and quick, has strong operability and high accuracy, and is beneficial to quickly and accurately solving the color cast problem.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a voltage-luminance graph of RGB three-color sub-pixels in a full-color display device with pixel juxtaposition;
fig. 2 is a schematic structural diagram of an organic electroluminescent device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an organic electroluminescent device according to an embodiment of the present invention;
fig. 4 is a flowchart of a display method of an organic electroluminescent device according to an embodiment of the present invention;
fig. 5 is a flowchart of step S22 in a display method of an organic electroluminescent device according to an embodiment of the present invention;
fig. 6 is a schematic view of another structure of an organic electroluminescent device according to an embodiment of the present invention;
fig. 7 is a schematic structural view of an organic electroluminescent device according to a comparative example of the present invention.
Reference numerals:
1-red sub-pixel cell; 2-green sub-pixel cell; 3-a blue sub-pixel unit; 31-a first blue subpixel unit; 32-a second blue sub-pixel cell; 33-third blue sub-pixel cell.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
It should be noted that, in the conventional organic electroluminescent device, the pixel unit is composed of RGB three-color sub-pixels, and in practical applications, the blue sub-pixel has a large efficiency difference under different driving voltage conditions. Specifically, under the drive of high voltage, the luminous efficiency of the blue sub-pixel is higher; under the low-voltage driving, the luminous efficiency of the blue sub-pixel is lower than the normal level. The red sub-pixel and the green sub-pixel can normally emit light under the low-voltage driving, and the light emitting efficiency is relatively balanced. Under the low-voltage driving, the difference between the luminous efficiency of the red sub-pixel unit and the luminous efficiency of the green sub-pixel unit and the luminous efficiency of the blue sub-pixel unit is larger, and the color cast phenomenon of the screen body is caused.
In view of the above problem, an embodiment of the present invention provides an organic electroluminescent device, as shown in fig. 2, including a plurality of pixel units distributed in an array, where each pixel unit includes a red sub-pixel unit 1, a green sub-pixel unit 2, and a blue sub-pixel unit 3, each of the red sub-pixel unit 1 and the green sub-pixel unit 2 is one, the number of the blue sub-pixel units 3 is at least two, and each of the sub-pixel units can be driven independently. That is, when the pixel unit is lighted, each sub-pixel unit can be selectively lighted, and each sub-pixel unit can be independently controlled.
In specific application, the light-emitting efficiency of the blue sub-pixel unit is lower than a normal level under low-voltage driving, and the red sub-pixel and the green sub-pixel can normally emit light under low-voltage driving, so that the light-emitting efficiency is more balanced, and the color cast problem is easily caused. Two or more blue light sub-pixel units can be lightened simultaneously at the moment, the blue light luminous efficiency is improved, the luminous efficiency between blue light and red light and green light is reduced, and the problem of color cast is solved.
Under the high-voltage driving, the light emitting efficiency of the blue sub-pixel unit is improved, and at the moment, only one blue sub-pixel unit can be lightened.
That is, the organic electroluminescent device with the structure can light different numbers of blue sub-pixel units 3 according to different conditions, and reduce the poor light emitting efficiency between blue light and red light and green light as much as possible, so as to achieve the purpose of reducing color cast.
In this embodiment, an absolute value of a difference between the green light emission efficiency and the blue light emission efficiency in each pixel unit is not greater than a first preset value. Note that the luminous efficiency varies depending on the luminance. The "difference between the luminous efficiency of green light and the luminous efficiency of blue light" as used herein means the difference between the luminous efficiency of green light and the luminous efficiency of blue light under the same luminance condition. The brightness condition encompasses low brightness and high brightness. Namely, under the condition of different brightness, the difference between the green light luminous efficiency and the blue light luminous efficiency can be kept within a certain range, and the problem of color cast caused by low blue light luminous efficiency under low brightness in the prior art is solved.
As an optional implementation manner, in this embodiment, the first preset value is 144 cd/a. Namely, the absolute value of the difference between the luminous efficiency of the green light and the luminous efficiency of the blue light in each pixel unit is not more than 144cd/A, so that the difference of the luminous efficiency between the green light and the blue light is not large, and color cast is prevented.
As an alternative implementation manner, in this embodiment, the absolute value of the difference between the red light emission efficiency and the blue light emission efficiency in each pixel unit is not greater than 46 cd/a.
As an optional implementation manner, in this embodiment, the number of the blue sub-pixel units 3 is two, which are respectively the first blue sub-pixel unit 31 and the second blue sub-pixel unit 32, and the light emitting materials in the first blue sub-pixel unit 31 and the second blue sub-pixel unit 32 are fluorescent materials.
On one hand, under the low-voltage driving, the blue light emitting efficiency can be improved by simultaneously lighting the first blue light sub-pixel unit 31 and the second blue light sub-pixel unit 32, and the purpose of reducing color cast is achieved; on the other hand, the fluorescent material has a narrow spectrum, so that the fluorescent material is used as a luminescent material, the color gamut area is increased, the display quality is improved, the cost of the fluorescent material is low, and the preparation cost is reduced.
In this embodiment, the fluorescent light-emitting material in the blue sub-pixel unit 3 is at least one of TBP and BCzVBI.
As an alternative embodiment, in the present embodiment, the number of the blue sub-pixel units 3 may be three or four or even more, and in practical application, the number may be set according to practical requirements.
As an alternative, in this embodiment, the light emitting material in the green sub-pixel unit 2 is a phosphorescent material or a fluorescent material; the light emitting material in the red sub-pixel unit 1 is a phosphorescent material or a fluorescent material. Wherein Ir (ppy) can be selected in the green sub-pixel unit 23、Ir(mppy)3And m-PF-py as phosphorescent material, and at least one of C-545T, C-545MT and C-545P, TPBA as fluorescent material. PtOEP and Btp can be selected for the red photon pixel unit 12Ir(acac)、Ir(pig)3At least one of DCM, DCJ and DCJT can be selected as the fluorescent luminescent material.
As an alternative implementation, in this embodiment, the areas of the sub-pixel units are equal. Because the number of the blue sub-pixel units 3 in the pixel unit of the organic electroluminescent device is at least two, the total luminous area of the blue light is certainly larger than the luminous area of the red light and the luminous area of the green light, thereby increasing the luminous area of the blue light, further making up the defect of low luminous efficiency of the blue light under low voltage and reducing color cast.
As an alternative embodiment, the areas of the sub-pixel units may be unequal, but the total light emitting area of the blue light is generally set to be larger than the area of the red sub-pixel unit and the area of the green sub-pixel unit.
As an alternative implementation manner, as shown in fig. 3, in this embodiment, the sum of the areas of the first blue sub-pixel unit 31 and the second blue sub-pixel unit 32 is equal to the sum of the areas of the red sub-pixel unit 1 and the green sub-pixel unit 2, and the areas of the first blue sub-pixel unit 31 and the second blue sub-pixel unit 32 are not equal. Therefore, under the high-voltage driving, only one of the first blue sub-pixel unit 313 and the second blue sub-pixel unit 32 with a smaller area can be selected to be turned on, so that the light emitting efficiency of blue light under high luminance is reduced to be adapted to the light emitting efficiency of red light and green light, and the problem that the light emitting efficiency of blue light under high luminance is higher is solved.
In addition, in this embodiment, each of the sub-pixel units includes an anode layer, a light emitting layer, and a cathode layer stacked. A carrier function layer, such as a hole injection layer and/or a hole transport layer and/or an electron blocking layer, may be further provided between the anode layer and the light-emitting layer. A carrier functional layer, such as an electron injection layer and/or an electron transport and/or hole blocking layer, may also be provided between the cathode layer and the light emitting layer. The arrangement of the carrier function layer helps to improve the migration efficiency and recombination efficiency of carriers.
Example 2
An embodiment of the present invention provides a display method of an organic electroluminescent device provided in embodiment 1, as shown in fig. 4, including the following steps:
step S21, providing an organic electroluminescent device, where the organic electroluminescent device includes a plurality of pixel units distributed in an array, each pixel unit includes a red sub-pixel unit 1, a green sub-pixel unit 2, and a blue sub-pixel unit 3, and the number of the blue sub-pixel units 3 is at least two, and each sub-pixel unit can be independently driven.
As for the organic electroluminescent device, detailed description has been made in embodiment 1, and no further description is given here.
Step S22, determining the number of blue sub-pixels to be turned on according to the requirement for the brightness value of the blue sub-pixels.
That is, by the above display method, the number of the lighting sub-pixel units of the blue light can be freely selected according to the brightness value requirement of the sub-pixel units of the blue light, so as to meet the actual brightness requirement of the blue light. Especially, the luminous efficiency of blue light under low brightness is improved, and then the luminous efficiency of the blue light is matched with that of the red light and the green photon pixel unit, and the problem of color cast caused by low luminous efficiency of the blue light in the traditional low-voltage driving is solved.
As an optional implementation manner, in this embodiment, the number of the blue sub-pixel units 3 is two, which are respectively the first blue sub-pixel unit 31 and the second blue sub-pixel unit 32, and the light emitting materials in the first blue sub-pixel unit 31 and the second blue sub-pixel unit 32 are fluorescent materials.
As an alternative, as shown in fig. 5, in this embodiment, the step S22 of determining the turn-on number of the blue sub-pixel according to the brightness value requirement of the blue sub-pixel includes:
step S221, obtaining a brightness value requirement for the blue sub-pixel, where the brightness value requirement may be set according to the red brightness, the green brightness, and the white chromaticity coordinate.
Step S222, determining whether the brightness value is greater than a second preset value.
As an optional implementation manner, in this embodiment, the second preset value is 10cd/m2～100cd/m2May be 10cd/m2And may be 100cd/m2It may be 60cd/m2And the second preset value can be selected according to actual requirements. Generally, the preset value is set to 100cd/m2。
In step S223, when the brightness value is less than or equal to the second preset value, the first blue sub-pixel unit 31 and the second blue sub-pixel unit 32 are turned on.
In step S224, when the luminance value is greater than the second preset value, the first blue sub-pixel unit 31 or the second blue sub-pixel unit 32 is turned on.
Since the conventional blue light has a low luminous efficiency at low voltage and low luminance, and the luminous efficiencies of the red light and the green light are kept normal at low voltage and low luminance, the color shift problem is liable to occur. In the method, the brightness value requirement is compared with the preset value, so that the two blue light sub-pixel units are simultaneously started in a low-brightness state to improve the blue light luminous efficiency and prevent color cast; in a high brightness state, only one blue sub-pixel unit is started to adapt to the luminous efficiency of red light and green light and reduce color cast. The method is simple, convenient and quick, has strong operability and high accuracy, and is beneficial to quickly and accurately solving the color cast problem.
Example 3
The present embodiment provides an organic electroluminescent device, which includes a plurality of pixel units distributed in an array, as shown in fig. 2, each pixel unit includes a red sub-pixel unit 1, a green sub-pixel unit 2, and two blue sub-pixel units 3, each blue sub-pixel unit 3 includes a first blue sub-pixel unit 31 and a second blue sub-pixel unit 32, and each sub-pixel unit can be driven independently.
The light emitting material in the first blue sub-pixel unit 31 is BCzVBI, and the light emitting material in the second blue sub-pixel unit 32 is BCzVBI.
In this embodiment, the red sub-pixel unit 1 has a structure of Ag (10nm)/ITO (100nm)/CuPc (20nm)/TPD (200nm)/CBP Ir (piq)3(3％,30nm)/TPBi(40nm)/LiF(1nm)/Mg:Ag(20％,15nm)/NPB(60nm)。
The device structure of the green photon pixel unit 2 is Ag (10nm)/ITO (100nm)/CuPc (20nm)/TPD (200nm)/CBP (ir (ppy)3(10％,30nm)/TPBi(40nm)/LiF(1nm)/Mg:Ag(20％,15nm)/NPB(60nm)。
The device structure of the first blue sub-pixel unit 31 is Ag (10nm)/ITO (100nm)/CuPc (20nm)/TPD (110nm)/CBP, BCzVBI (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg, Ag (20%, 15nm)/NPB (60 nm).
The device structure of the second blue sub-pixel unit 32 is Ag (10nm)/ITO (100nm)/CuPc (20nm)/TPD (110nm)/CBP, BCzVBI (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg, Ag (20%, 15nm)/NPB (60 nm).
Example 4
This example provides an organic electroluminescent device which is substantially the same as the organic electroluminescent device described in example 3, with the only difference that:
as shown in fig. 6, in the present embodiment, the number of the blue sub-pixel units 3 is three, and the blue sub-pixel units are respectively a first blue sub-pixel unit 31, a second blue sub-pixel unit 32, and a third blue sub-pixel unit 33. The light emitting material in the third blue sub-pixel unit 33 is BCzVBI.
In this embodiment, the third blue sub-pixel unit 33 has a device structure of Ag (10nm)/ITO (100nm)/CuPc (20nm)/TPD (110nm)/CBP: BCzVBI (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg: Ag (20%, 15nm)/NPB (60 nm).
Comparative example
This comparative example provides an organic electroluminescent device which is substantially the same as the organic electroluminescent device described in example 3, with the only difference that:
as shown in fig. 7, in the present comparative example, the blue sub-pixel unit 3 in the pixel unit has only the first blue sub-pixel unit 31 and does not have the second blue sub-pixel unit 32.
The above examples 3, 4 and comparative examples were tested and the results compared as shown in the following table:
as can be seen from the above test data, the organic electroluminescent device provided in the embodiment of the present invention improves the luminance of blue light by providing two or more blue photonic pixel units, reduces the difference in luminous efficiency between blue light and red light and green light at different luminances, further solves the problem of color shift caused by low luminous efficiency of blue light, and improves the display quality.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. An organic electroluminescent device is characterized by comprising a plurality of pixel units distributed in an array, wherein each pixel unit comprises a red sub-pixel unit (1), a green sub-pixel unit (2) and a blue sub-pixel unit (3), the number of the blue sub-pixel units (3) is at least two, each blue sub-pixel unit is driven independently, the absolute value of the difference value of the green light luminous efficiency and the blue light luminous efficiency in each pixel unit is not larger than a first preset value, and the first preset value is used for limiting the luminous efficiency difference between the green light and the blue light under the same brightness condition so as to prevent color cast; the value of the driving voltage applied for driving at least two blue sub-pixel elements (3) simultaneously is smaller than the value of the driving voltage applied for driving only one blue sub-pixel element (3).
2. The organic electroluminescent device according to claim 1, wherein the first preset value is 164 cd/a.
3. The organic electroluminescent device according to claim 1 or 2, characterized in that the number of the blue photon pixel units (3) is two, namely a first blue light sub-pixel unit (31) and a second blue light sub-pixel unit (32), and the luminescent materials in the first blue light sub-pixel unit (31) and the second blue light sub-pixel unit (32) are fluorescent materials.
4. The organic electroluminescent device according to claim 1 or 2, wherein the areas of the sub-pixel units are equal.
5. The organic electroluminescent device according to claim 1 or 2, characterized in that the luminescent material in the green photonic pixel unit (2) is a phosphorescent material or a fluorescent material; the luminescent material in the red sub-pixel unit (1) is a phosphorescent material or a fluorescent material.
6. A display method of an organic electroluminescent device, comprising the steps of:
providing an organic electroluminescent device, wherein the organic electroluminescent device comprises a plurality of pixel units distributed in an array, each pixel unit comprises a red sub-pixel unit (1), a green sub-pixel unit (2) and a blue sub-pixel unit (3), the number of the blue sub-pixel units (3) is at least two, and each blue sub-pixel unit is independently driven;
and judging the turn-on number of the blue photonic pixels according to the brightness value requirement of the blue photonic pixels, wherein the brightness value requirement applied by simultaneously driving at least two blue photonic pixel units (3) is smaller than the brightness value requirement applied by only driving one blue photonic pixel unit (3).
7. The display method according to claim 6, wherein the number of the blue photon pixel units (3) is two, and the blue photon pixel units are respectively a first blue light sub-pixel unit (31) and a second blue light sub-pixel unit (32), and the luminescent materials in the first blue light sub-pixel unit (31) and the second blue light sub-pixel unit (32) are fluorescent materials.
8. The method according to claim 7, wherein the step of determining the number of blue sub-pixels to turn on according to the brightness value requirement of the blue sub-pixels comprises:
acquiring a brightness value requirement of the blue sub-pixel;
judging whether the brightness value is larger than a second preset value or not;
when the brightness value is smaller than or equal to the second preset value, the first blue sub-pixel unit (31) and the second blue sub-pixel unit (32) are started;
and when the brightness value is larger than the second preset value, starting the first blue sub-pixel unit (31) or the second blue sub-pixel unit (32).
9. Display according to claim 8Method, characterized in that the second preset value is 10cd/m2～100cd/m2。
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| CN113991041B (en) * | 2021-10-27 | 2023-09-22 | 京东方科技集团股份有限公司 | Display substrate and display device |
| CN114863876A (en) * | 2022-05-31 | 2022-08-05 | 武汉天马微电子有限公司 | Display panel, display driving method thereof and electronic device |
| CN115939165B (en) * | 2022-12-14 | 2023-10-13 | 佛山思坦半导体科技有限公司 | Miniature LED device and preparation method |
| CN115799295B (en) * | 2022-12-14 | 2023-10-13 | 佛山思坦半导体科技有限公司 | Miniature LED device and preparation method |
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