CN108987441A - Organnic electroluminescent device and its display methods - Google Patents
Organnic electroluminescent device and its display methods Download PDFInfo
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- CN108987441A CN108987441A CN201810713462.6A CN201810713462A CN108987441A CN 108987441 A CN108987441 A CN 108987441A CN 201810713462 A CN201810713462 A CN 201810713462A CN 108987441 A CN108987441 A CN 108987441A
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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
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/12—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising dopants
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Abstract
The present invention relates to field of display technology, disclose a kind of Organnic electroluminescent device and its display methods, the device includes several pixel units of array distribution, and each pixel unit includes feux rouges sub-pixel unit, green light sub-pixel unit, the first blue light sub-pixel unit and the second blue light sub-pixel unit；Under same brightness value requires, the luminous efficiency of the luminous efficiency of the first blue light sub-pixel unit and the second blue light sub-pixel unit is not identical.Pass through the mutual cooperation of the blue light sub-pixel unit of different luminous efficiencies, improve luminous efficiency of the blue light under low-light level, and then the luminous efficiency of itself and feux rouges and green light sub-pixel unit is made to match, facilitate solve tradition in low voltage drive when, because blue light luminous efficiency it is relatively low caused by colour cast problem.
Description
Technical field
The present invention relates to field of display technology, and in particular to a kind of Organnic electroluminescent device and its display methods.
Background technique
Display of organic electroluminescence (full name in English Organic Light Emitting Display, abbreviation OLED) is
Active luminous display unit, since it has many advantages, such as simple preparation process, at low cost, high contrast, wide viewing angle, low-power consumption,
It is expected to become next-generation mainstream flat panel display, is most one of technology that attracts attention in current flat panel display.
In existing organic light emitting display panel true color method, red, green, blue (three primary colours Red, Green,
Blue, abbreviation RGB) (full name in English is current for color filter, referred to as CF) method to pixel juxtaposition method with colored filter
Develop most mature two methods.Colored filter method need to play liquid crystal surface using white organic LED as backlight
The effect of backlight and liquid crystal molecule in plate, be subject to again above optical filter to be displayed in red, green, blue light.However, due to light
Line has biggish energy loss after passing through colored filter, and display panel power consumption is caused to increase；Therefore, pixel juxtaposition method is still
The full-color display methods that industry is favored very much.
Fig. 1 shows the voltage-brightness curve graph of tri- sub-pixels of RGB in the full-color display device of pixel juxtaposition method.By scheming
It is found that the bright voltage that opens of tri- sub-pixels of RGB is inconsistent in existing OLED display device.Specifically, blue photons picture
The bright voltage that the bright voltage of element is greater than green light sub-pixel is greater than the bright voltage of feux rouges pixel.When practical application, due to indigo plant
There are biggish efficiency variances under the conditions of different driving voltages for sub-pixels.That is, under high voltage drive, blue light sub-pixel hair
Light efficiency is higher；Under low voltage drive, blue light sub-pixel for emitting light efficiency is lower.However, feux rouges sub-pixel, green light sub-pixel
Driving voltage is relatively low, under low voltage drive can normal luminous, this is allowed for, in low ash rank, feux rouges picture
Plain, green light sub-pixel luminous efficiency is higher than the luminous efficiency of blue light sub-pixel, and then shields body and colour cast (partially red) phenomenon easily occur.
Summary of the invention
For this purpose, OLED, which is shown, easily there is colour cast the technical problem to be solved by the present invention is in the prior art.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
The present invention provides a kind of Organnic electroluminescent devices, several pixel units including array distribution, each picture
Plain unit includes feux rouges sub-pixel unit, green light sub-pixel unit, the first blue light sub-pixel unit and the second blue light sub-pixel list
Member；
Under same brightness value requires, the luminous efficiency of the first blue light sub-pixel unit and the second blue light sub-pixel
The luminous efficiency of unit is not identical.
Optionally, under same brightness value requires, the luminous efficiency of the first blue light sub-pixel unit be 10cd/A~
25cd/A, the luminous efficiency of the second blue light sub-pixel unit are 4cd/A~10cd/A.
Optionally, luminescent material is phosphor material, the second blue light sub-pixel in the first blue light sub-pixel unit
Luminescent material is fluorescent material in unit.
Optionally, the area equation of the first blue light sub-pixel unit and the second blue light sub-pixel unit or not
Deng.
Optionally, the feux rouges sub-pixel unit, the green light sub-pixel unit, the first blue light sub-pixel unit with
And the elemental area of the second blue light sub-pixel unit is equal.
Optionally, the luminescent material in the feux rouges sub-pixel unit is phosphor material or fluorescent material.
Optionally, the luminescent material in the green light sub-pixel unit is phosphor material or fluorescent material.
The present invention also provides a kind of display methods of above-mentioned Organnic electroluminescent device, comprising the following steps:
A display device is provided, several pixel units including array distribution, each pixel unit includes feux rouges picture
Plain unit, green light sub-pixel unit, the first blue light sub-pixel unit and the second blue light sub-pixel unit, the first blue photons picture
Plain unit and the second blue light sub-pixel unit can be independently driven；And under same brightness value requires, first blue light
The luminous efficiency of sub-pixel unit and the luminous efficiency of the second blue light sub-pixel unit be not identical；
Judgement is required to open the first blue light sub-pixel unit and/or institute according to the brightness value to the blue light sub-pixel
State the second blue light sub-pixel unit.
Optionally, the basis requires judgement to open the first blue light sub-pixel the brightness value of the blue light sub-pixel
Unit and/or the second blue light sub-pixel unit step include:
Obtain the brightness value requirement to the blue light sub-pixel；
Judge whether the brightness value is greater than preset value；
When the brightness value is less than or equal to the preset value, first blue photons under the conditions of the brightness value are opened
Higher one of luminous efficiency in pixel unit and the second blue light sub-pixel unit, or first blue light is opened simultaneously
Sub-pixel unit and the second blue light sub-pixel unit.
Optionally, the preset value is 10cd/m2~100cd/m2。
Technical solution of the present invention has the advantages that
Organnic electroluminescent device provided in an embodiment of the present invention, several pixel units including array distribution are each described
Pixel unit includes feux rouges sub-pixel unit, green light sub-pixel unit, the first blue light sub-pixel unit and the second blue light sub-pixel
Unit, each sub-pixel unit can be independently driven.That is, alternative lights each sub-pixel when lighting pixel unit
Unit.Under the requirement of same brightness value, the hair of the luminous efficiency of the first blue light sub-pixel unit and the second blue light sub-pixel unit
Light efficiency is not identical.That is, the mutual cooperation relationship of the blue light sub-pixel unit by different luminous efficiencies, improves blue light low bright
Whole lighting efficiency under degree, and then match with the luminous efficiency of feux rouges and green light sub-pixel unit, help to solve tradition
When middle low voltage drive, because blue light luminous efficiency it is relatively low caused by colour cast problem.
Organnic electroluminescent device provided in an embodiment of the present invention, luminescent material is phosphorescence in the first blue light sub-pixel unit
Material, luminescent material is fluorescent material in the second blue light sub-pixel unit.This is because phosphor material issues light efficiency in low-light level
Rate is higher, and fluorescent material luminous efficiency under low-light level is relatively low, selects phosphor material as the first blue photons in the present embodiment
Luminescent material in pixel unit selects fluorescent material as the luminescent material in the second blue light sub-pixel unit, so that blue light
Luminous efficiency be able to maintain in metastable state.Especially under low-light level, luminous efficiency higher can be lighted simultaneously
One blue light sub-pixel unit and the lower second blue light sub-pixel unit of luminous efficiency, or only light luminous efficiency higher
One blue light sub-pixel unit, to improve luminous efficiency of the blue light under low-light level.
The display methods of Organnic electroluminescent device provided in an embodiment of the present invention provides a display device first, this is aobvious
Showing device includes several pixel units of array distribution, and each pixel unit includes feux rouges sub-pixel unit, green light sub-pixel
Unit, the first blue light sub-pixel unit and the second blue light sub-pixel unit, the first blue light sub-pixel unit and described second
Blue light sub-pixel unit can be independently driven；And under same brightness value requires, the luminous efficiency of the first blue light sub-pixel unit
It is not identical with the luminous efficiency of the second blue light sub-pixel unit；Then judgement is required to open according to the brightness value to blue light sub-pixel
First blue light sub-pixel unit and/or the second blue light sub-pixel unit.That is, by above-mentioned display method, it can be according to blue photons
The brightness value requirement of pixel unit, the unlatching combination of the blue light sub-pixel unit of unrestricted choice difference luminous efficiency, with full
The intrinsic brilliance demand of sufficient blue light.It has been improved particularly luminous efficiency of the blue light under low-light level, has made itself and feux rouges and green light picture
The luminous efficiency of plain unit matches, and when helping to solve low voltage drive in tradition, causes because blue light luminous efficiency is relatively low
Colour cast problem.
The display methods of Organnic electroluminescent device provided in an embodiment of the present invention, according to the brightness value to blue light sub-pixel
It is required that the first blue light sub-pixel unit is opened in judgement and/or the second blue light sub-pixel unit step includes: to obtain to blue photons picture
The brightness value requirement of element；Judge whether brightness value is greater than preset value；When brightness value is less than or equal to preset value, brightness value is opened
Under the conditions of the higher blue light sub-pixel unit of luminous efficiency or two blue light sub-pixel units.
Since luminous efficiency is relatively low under low-light level for traditional blue light, easily there is colour cast problem.Pass through ratio in the above method
Compared with brightness value and preset value, so that opening the higher blue light sub-pixel unit of luminous efficiency under low bright state or opening simultaneously
Two blue light sub-pixel units prevent colour cast to improve blue light luminous efficiency.This method is relatively simple quick, and can operate
Property it is strong, accuracy is high, helps quick and precisely to solve the problems, such as colour cast.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the voltage-brightness curve graph of tri- sub-pixels of RGB in the full-color display device of pixel juxtaposition method；
Fig. 2 is a kind of structural schematic diagram of Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 3 is the flow chart of the display methods of Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 4 is the flow chart of step S22 in the display methods of Organnic electroluminescent device provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram for the Organnic electroluminescent device that comparative example of the present invention provides.
Appended drawing reference:
1- feux rouges sub-pixel unit；2- green light sub-pixel unit；31- the first blue light sub-pixel unit；The second blue photons of 32-
Pixel unit.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second " are only
For descriptive purposes, it is not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements, can be wireless connection, be also possible to wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
Embodiment 1
Firstly the need of explanation, traditional Organnic electroluminescent device is the pixel list being made of tri- sub-pixels of RGB
Member, when practical application, there are biggish efficiency variances under the conditions of different driving voltages for blue light sub-pixel.Specifically, high electricity
Under pressure driving, blue light sub-pixel for emitting light efficiency is higher；Under low voltage drive, blue light sub-pixel for emitting light efficiency is lower.And feux rouges
Sub-pixel and green light sub-pixel under low voltage drive can normal luminous, luminous efficiency is more balanced.This is resulted in low
Under voltage driving, the difference of the luminous efficiency of the luminous efficiency and blue light sub-pixel of feux rouges sub-pixel unit and green light sub-pixel unit
It is different larger, it in turn results in screen body and color offset phenomenon occurs.
In view of the above-mentioned problems, the embodiment of the invention provides a kind of Organnic electroluminescent devices, if including array distribution
Dry pixel unit, as shown in Fig. 2, each pixel unit includes feux rouges sub-pixel unit 1, green light sub-pixel unit 2, the first blue photons
Pixel unit 31 and the second blue light sub-pixel unit 32, the first blue light sub-pixel unit 31 and the second blue light sub-pixel unit 32 are
It can be independently driven.That is, when lighting pixel unit, alternative lights each sub-pixel unit, and each sub-pixel unit can be with
It is independently controlled.
When practical application, feux rouges sub-pixel unit 1, green light sub-pixel unit 2, the first blue light sub-pixel can be lighted simultaneously
Unit 31 and the second blue light sub-pixel unit 32, can also only light the first blue light sub-pixel unit 31 and the second blue light sub-pixel
Any one in unit 32 and feux rouges sub-pixel unit 1, green light sub-pixel unit 2.
In the present embodiment, under same brightness value requires, the luminous efficiency and the second blue light of the first blue light sub-pixel unit 31
The luminous efficiency of sub-pixel unit 32 is not identical.Preferably, under the requirement of same brightness value, the first blue light sub-pixel unit 31
Luminous efficiency is 10cd/A~25cd/A, and the luminous efficiency of the second blue light sub-pixel unit 32 is 4cd/A~10cd/A.
As a result, by the mutual cooperation of the blue light sub-pixel unit of different luminous efficiencies, blue light is improved under low-light level
Luminous efficiency, and then match with the luminous efficiency of feux rouges and green light sub-pixel unit, help to solve low-voltage in tradition
When driving, because blue light luminous efficiency it is relatively low caused by colour cast problem.
As a kind of optional embodiment, in the present embodiment, luminescent material is phosphorescence in the first blue light sub-pixel unit 31
Material, luminescent material is fluorescent material in the second blue light sub-pixel unit 32.
Since luminous efficiency is higher under low-light level for phosphor material, and fluorescent material luminous efficiency under low-light level is relatively low,
It selects phosphor material as the luminescent material in the first blue light sub-pixel unit in the present embodiment, selects fluorescent material as second
Luminescent material in blue light sub-pixel unit, so that the luminous efficiency of blue light is able to maintain in metastable state.Especially exist
Under low-light level, the higher first blue light sub-pixel unit of luminous efficiency and lower second blue photons of luminous efficiency can be lighted simultaneously
Pixel unit, or the higher first blue light sub-pixel unit of luminous efficiency is only lighted, to improve hair of the blue light under low-light level
Light efficiency.
Wherein, be used as in the first blue light sub-pixel unit 31 luminescent material phosphor material select Firpic, FirN4,
At least one of Firtaz, the fluorescent material that luminescent material is used as in the second blue light sub-pixel unit 32 select TBP, BCzVBI
At least one of.
In the present embodiment, the luminescent material in feux rouges sub-pixel unit 1 is phosphor material or fluorescent material.Wherein, feux rouges
The phosphor material for being used as luminescent material in sub-pixel unit 1 selects PtOEP, Btp2Ir(acac)、Ir(pig)3In at least one
Kind, the fluorescent material that luminescent material is used as in feux rouges sub-pixel unit 1 selects at least one of DCM, DCJ, DCJT.
In the present embodiment, the luminescent material in green light sub-pixel unit 2 is phosphor material or fluorescent material.Wherein, green light
The phosphor material for being used as luminescent material in sub-pixel unit 2 selects Ir (ppy)3、Ir(mppy)3, at least one of m-PF-py,
The fluorescent material for being used as luminescent material in green light sub-pixel unit 2 is selected in C-545T, C-545MT, C-545P, TPBA at least
It is a kind of.
As a kind of optional embodiment, in the present embodiment, the first blue light sub-pixel unit 31 and the second blue light sub-pixel
The area equation of unit 32 differs.
That is, the face of the first blue light sub-pixel unit 31 and the second blue light sub-pixel unit 32 can be set according to actual needs
Product.For example, when more demanding to blue light luminous efficiency, it can be by the first blue light sub-pixel unit 31 and the second blue light sub-pixel
The area of the higher side of luminous efficiency is set greater than the area of the higher side of luminous efficiency in unit 32.It is sent out when to blue light
It, can be by both the first blue light sub-pixel unit 31 and the second blue light sub-pixel unit 32 when light efficiency requirement is mean level
Area is set as equal.It, can be blue by the first blue light sub-pixel unit 31 and second when requiring lower to blue light luminous efficiency
The area of the lower side of luminous efficiency is set greater than the area of the higher side of luminous efficiency in sub-pixels unit 32.Tool
How body is arranged, can according to the actual situation depending on.
As a kind of optional embodiment, in the present embodiment, feux rouges sub-pixel unit 1, green light sub-pixel unit 2, first
The elemental area of blue light sub-pixel unit 31 and the second blue light sub-pixel unit 32 is equal.I other words the first blue light sub-pixel
The sum of area of unit 31 and the second blue light sub-pixel unit 32 is equal to feux rouges sub-pixel unit 1 and green light sub-pixel unit 2
The sum of area, i.e. blue light emitting area are equal to the sum of feux rouges and green luminescence area.Pass through the light-emitting surface of increase blue light as a result,
Product, compensates for the low defect of blue light luminous efficiency under low-voltage, further reduces colour cast problem.
As alternative embodiments, the area of the first blue light sub-pixel unit 31 and the second blue light sub-pixel unit 32 it
The sum of feux rouges sub-pixel unit 1 and the area of green light sub-pixel unit 2 can also be greater than.
In the present embodiment, sub-pixel unit includes anode layer, luminescent layer and the cathode layer for stacking setting.Wherein, positive
Carrier functional layer, such as hole injection layer and/or hole transmission layer and/or electronics can also be set between pole layer and luminescent layer
Barrier layer etc..Also carrier functional layer, such as electron injecting layer and/or electron-transport can be set between cathode layer and luminescent layer
And/or hole blocking layer etc..
Embodiment 2
The embodiment of the invention provides a kind of display methods for the Organnic electroluminescent device that above-described embodiment 1 provides, such as
Shown in Fig. 3, comprising the following steps:
Step S21, a display device is provided, several pixel units including array distribution, each pixel unit includes feux rouges
Sub-pixel unit 1, green light sub-pixel unit 2, the first blue light sub-pixel unit 31 and the second blue light sub-pixel unit 32, first is blue
Sub-pixels unit 31 and the second blue light sub-pixel unit 32 can be independently driven；And under same brightness value requires, first is blue
The luminous efficiency of sub-pixels unit 31 and the luminous efficiency of the second blue light sub-pixel unit 32 be not identical.
About the Organnic electroluminescent device, it has been described later in detail in embodiment 1, details are not described herein.
Step S22, according to the brightness value of blue light sub-pixel require judgement open the first blue light sub-pixel unit 31 and/or
Second blue light sub-pixel unit 32.
That is, can be required according to the brightness value of blue light sub-pixel unit by above-mentioned display method, unrestricted choice difference hair
The unlatching combination of the blue light sub-pixel unit of light efficiency, to meet the intrinsic brilliance demand of blue light.It has been improved particularly blue light
Luminous efficiency under low-light level, and then the luminous efficiency of itself and feux rouges and green light sub-pixel unit is made to match, help to solve
Certainly tradition in low voltage drive when, because blue light luminous efficiency it is relatively low caused by colour cast problem.
As a kind of optional embodiment, as shown in figure 4, step S22 is according to blue light sub-pixel in the present embodiment
Brightness value requires to judge that the step of opening the first blue light sub-pixel unit 31 and/or the second blue light sub-pixel unit 32 includes:
Step S221, it obtains to the requirement of the brightness value of blue light sub-pixel, which requires can be according to feux rouges brightness, green
Brightness and white light chromaticity coordinate are set.
Step S222, judge whether brightness value is greater than preset value.
As a kind of optional embodiment, in the present embodiment, which is 10cd/m2~100cd/m2In arbitrary value,
It can be 10cd/m2, or 100cd/m2, or 60cd/m2Deng preset value can be selected according to actual needs.One
As, preset value is set as 100cd/m2。
Step S223, when brightness value is less than or equal to preset value, the first blue light sub-pixel list under the conditions of brightness value is opened
Luminous efficiency higher one in member 31 and the second blue light sub-pixel unit 32, or the first blue light sub-pixel unit is opened simultaneously
31 and the second blue light sub-pixel unit 32.
When brightness value is greater than preset value, the first blue light sub-pixel unit 31 and the second blue light under the conditions of the brightness value are opened
Lower one of luminous efficiency in sub-pixel unit 32.
Since luminous efficiency is relatively low under low-light level for traditional blue light, and feux rouges and the green light luminous efficiency under low-light level are protected
It holds normally, therefore colour cast problem easily occurs.By comparing brightness value and preset value in the above method, so that under low bright state,
It opens the higher blue light sub-pixel unit of luminous efficiency or opens two blue light sub-pixel units simultaneously, to improve blue light emitting effect
Rate prevents colour cast.This method is relatively simple quick, and strong operability, and accuracy is high, helps quick and precisely to solve colour cast
Problem.
Embodiment 3
A kind of Organnic electroluminescent device is present embodiments provided, several pixel units including array distribution, each pixel
Unit includes feux rouges sub-pixel unit 1, green light sub-pixel unit 2, the first blue light sub-pixel unit 31 and the second blue light sub-pixel
Unit 32.
Wherein, luminescent material selects phosphor material, specially Firpic, low bright in the first blue light sub-pixel unit 31
The luminous efficiency spent under 100cd/m^2 is 20cd/A；Luminescent material selects fluorescent material, tool in second blue light sub-pixel unit 32
Body is BCzVBI, and the luminous efficiency at low-light level 100cd/m^2 is 5cd/A.
Luminescent material selects phosphor material, specially Ir (pig) in feux rouges sub-pixel unit 13, in low-light level 500cd/
Luminous efficiency under m^2 is 45cd/A；Luminescent material selects phosphor material, specially Ir (ppy) in green light sub-pixel unit 23,
Its luminous efficiency at low-light level 1000cd/m^2 is 145cd/A.
In the present embodiment, the device architecture of feux rouges sub-pixel unit 1 be 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 architecture of green light sub-pixel unit 2 be 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 architecture of first blue light sub-pixel unit 31 is Ag (10nm)/ITO (100nm)/CuPc (20nm)/TPD
(110nm)/CBP:Firpic (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
The device architecture of second blue light 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 (60nm).
Embodiment 4
A kind of Organnic electroluminescent device is present embodiments provided, is filled with the organic electroluminescent recorded in embodiment 3
Set it is essentially identical, only difference is that:
Phosphorescent light-emitting materials in first blue light sub-pixel unit 31 are specially FirN4, at low-light level 100cd/m^2
Luminous efficiency be 15.3cd/A；Fluorescence luminescent material in second blue light sub-pixel unit 32 is specially TBP, in low-light level
Luminous efficiency under 100cd/m^2 is 8cd/A.
In the present embodiment, the device architecture of the first blue light sub-pixel unit 31 is Ag (10nm)/ITO (100nm)/CuPc
(20nm)/TPD (110nm)/CBP:FirN4 (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/
NPB(60nm)。
The device architecture of second blue light sub-pixel unit 32 is Ag (10nm)/ITO (100nm)/CuPc (20nm)/TPD
(110nm)/CBP:TBP (3%, 30nm)/TPBi (40nm)/LiF (1nm)/Mg:Ag (20%, 15nm)/NPB (60nm).
Comparative example
This comparative example provides a kind of Organnic electroluminescent device, fills with the organic electroluminescent recorded in embodiment 3
Set it is essentially identical, only difference is that:
As shown in figure 5, only including feux rouges sub-pixel unit 1,2 and of green light sub-pixel unit in pixel unit in this comparative example
First blue light sub-pixel unit 31, and luminescent material selects fluorescent material in the first blue light sub-pixel unit 31, specially
BCzVBI, the luminous efficiency at low-light level 100cd/m^2 are 5cd/A.
In this comparative example, the device architecture of the first blue light 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(60nm)。
Above-described embodiment 3, embodiment 4 and comparative example are tested, and test result is compared, such as following table institute
Show:
As above-mentioned test data it is found that Organnic electroluminescent device provided by the embodiment of the present application is in different luminous efficiencies
Blue light sub-pixel mutual cooperation under, blue light luminous efficiency is improved, and reduces and feux rouges and green light sub-pixel unit
Luminous efficiency between gap, solve under existing low voltage drive, because colour cast is asked caused by blue light luminous efficiency is low
Topic, improves display quality.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of Organnic electroluminescent device, which is characterized in that several pixel units including array distribution, each pixel list
Member includes feux rouges sub-pixel unit (1), green light sub-pixel unit (2), the first blue light sub-pixel unit (31) and the second blue photons
Pixel unit (32)；
Under same brightness value requires, the luminous efficiency of the first blue light sub-pixel unit (31) and the second blue light sub-pixel
The luminous efficiency of unit (32) is not identical.
2. Organnic electroluminescent device according to claim 1, which is characterized in that under same brightness value requires, described the
The luminous efficiency of one blue light sub-pixel unit (31) is 10cd/A~25cd/A, the hair of the second blue light sub-pixel unit (32)
Light efficiency is 4cd/A~10cd/A.
3. Organnic electroluminescent device according to claim 1 or 2, which is characterized in that the first blue light sub-pixel list
Luminescent material is phosphor material in first (31), and luminescent material is fluorescent material in the second blue light sub-pixel unit (32).
4. Organnic electroluminescent device according to claim 1-3, which is characterized in that the first blue photons picture
The area equation of plain unit (31) and the second blue light sub-pixel unit (32) differs.
5. Organnic electroluminescent device according to claim 1-4, which is characterized in that the feux rouges sub-pixel list
First (1), the green light sub-pixel unit (2), the first blue light sub-pixel unit (31) and the second blue light sub-pixel
The elemental area of unit (32) is equal.
6. Organnic electroluminescent device according to claim 1-5, which is characterized in that the feux rouges sub-pixel list
Luminescent material in first (1) is phosphor material or fluorescent material.
7. Organnic electroluminescent device according to claim 1-6, which is characterized in that the green light sub-pixel list
Luminescent material in first (2) is phosphor material or fluorescent material.
8. a kind of display methods of Organnic electroluminescent device, which comprises the following steps:
A display device is provided, several pixel units including array distribution, each pixel unit includes feux rouges sub-pixel list
First (1), green light sub-pixel unit (2), the first blue light sub-pixel unit (31) and the second blue light sub-pixel unit (32), described the
One blue light sub-pixel unit (31) and the second blue light sub-pixel unit (32) are independently driven；And same brightness value requirement
Under, the luminous efficiency of the luminous efficiency of the first blue light sub-pixel unit (31) and the second blue light sub-pixel unit (32)
It is not identical；
Judgement is required to open the first blue light sub-pixel unit (31) and/or institute according to the brightness value to the blue light sub-pixel
State the second blue light sub-pixel unit (32).
9. display methods according to claim 8, which is characterized in that brightness value of the basis to the blue light sub-pixel
It is required that the first blue light sub-pixel unit (31) and/or the second blue light sub-pixel unit (32) step packet are opened in judgement
It includes:
Obtain the brightness value requirement to the blue light sub-pixel；
Judge whether the brightness value is greater than preset value；
When the brightness value is less than or equal to the preset value, the first blue light sub-pixel under the conditions of the brightness value is opened
Luminous efficiency higher one in unit (31) and the second blue light sub-pixel unit (32), or described first is opened simultaneously
Blue light sub-pixel unit (31) and the second blue light sub-pixel unit (32).
10. display methods according to claim 9, which is characterized in that the preset value is 10cd/m2~100cd/m2。
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