CN104466022A - Organic light-emitting diode display device and manufacturing method thereof - Google Patents
Organic light-emitting diode display device and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to an organic light-emitting diode display device which comprises pixel unit layers. An anode layer is correspondingly arranged on one side of each pixel unit layer, and a cathode layer is correspondingly arranged on the other side of each pixel unit layer. The thickness of the cathode layers corresponding to sub-pixels with at least one light-emitting color is set to be different with the thickness of the cathode layers corresponding to the sub-pixels with the rest of light-emitting colors, so that the microcavity effect of organic light-emitting diodes with different light-emitting colors is improved, and thus the light-emitting efficiency, the brightness, the color reproducibility and other performance of the organic light-emitting diode display device are effectively improved. A manufacturing method of the organic light-emitting diode display device comprises the steps that the first cathode layers are manufactured through metal mask plates, second cathode layers are manufactured through fine metal mask plates, and the effect of improving the performance of the organic light-emitting diode display device can be achieved. The manufacturing technology is simple, and the manudacturing and applying cost of the organic light-emitting diode display device can be effectively lowered.
Description
Technical field
The present invention relates to field of organic electroluminescence, be specifically related to organic light emitting diodde desplay device that a kind of luminous efficiency is high, brightness is high, color rendering performance is excellent and preparation method thereof.
Background technology
Organic light emitting diodde desplay device (English full name Organic Light Emitting Display) is active illuminating device, there is the advantages such as high-contrast, wide viewing angle, low-power consumption, volume be thinner, being expected to become main flow flat panel display of future generation, is one of the maximum technology that receives publicity in current flat panel display.
Pixel unit layer in organic light emitting diodde desplay device comprises some juxtaposed Organic Light Emitting Diodes (English full name Organic Light-Emitting Diode is called for short OLED).Each Organic Light Emitting Diode at least comprises and has the anode layer of high work function, the cathode layer of low work function, and clamping luminescent layer between the anode layer and the cathode layer.In order to simplify device architecture and manufacture craft, the different Organic Light Emitting Diodes in same organic light emitting diodde desplay device share a negative electrode usually.
According to the light injection direction of Organic Light Emitting Diode, organic light emitting diodde desplay device can be divided into bottom emitting device and top emitting device.Because bottom emitting device light also by comprising the image element circuit layer of thin-film transistor, will have a strong impact on aperture opening ratio and the luminous efficiency of device after transparent anode injection; Therefore, light is directly from transparent cathode injection, thus the top emitting device realizing high aperture and high-luminous-efficiency gets more and more people's extensive concerning.Usually, in order to improve the luminous efficiency of organic light emitting diodde desplay device further, usually anode is made the reflecting electrode with metallic reflector.
Although reflecting electrode greatly can improve the luminous efficiency of organic light emitting diodde desplay device, but, because the optical length between the reflection anode of the organic light emitting diode device of different colours and transparent cathode is different, add that in organic light emitting diodde desplay device, each pixel cell at least comprises three kinds of glow colors, as ruddiness (R), green glow (G), blue light (B) etc., the emission wavelength difference of different glow color diode is larger, this just makes the different Organic Light Emitting Diodes of common cathode in same organic light emitting diodde desplay device microcavity effect separately all can not reach optimization, directly affects luminous efficiency and the brightness of the Organic Light Emitting Diode of different glow color, thus have impact on power consumption and the associated electrical performance of organic light emitting diodde desplay device.
Summary of the invention
For this reason, the problem that existing reduction top emitting organic light emitting diodde desplay device luminous efficiency to be solved by this invention is low, brightness is low, thus organic light emitting diodde desplay device that a kind of luminous efficiency is high, brightness is high and preparation method thereof is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of organic light emitting diodde desplay device of the present invention, comprise pixel unit layer, described pixel unit layer side correspondence arranges anode layer, opposite side correspondence arranges cathode layer, described pixel unit layer comprises the entirely not identical and sub-pixel be arranged in array of some glow colors, and the cathode electrode layer thickness that the cathode electrode layer thickness that the sub-pixel of at least one glow color is corresponding is corresponding from the sub-pixel of all the other glow colors is different.
Wherein in an embodiment, the cathode layer that each described sub-pixel is corresponding includes the first cathode layer, and the cathode layer that the sub-pixel of at least one glow color is corresponding comprises the second cathode layer, and the sub-pixel of all glow colors of described second cathode layer not all standing; Stacking upside or the downside being arranged on described first cathode layer of described second cathode layer.
Wherein in an embodiment, described first cathode layer is one or more layers stack layer formed in M, Ag and alloy thereof, and M is the one in Mg, Li, K, Ca, Na, Sr, Cs, Ba, Yb; Described second cathode layer is one or more layers stack layer formed in Mg, Ag and alloy thereof, or one or more layers stack layer formed in Li, K, Ca, Na, Sr, Cs, Ba, Yb.
Wherein in an embodiment, the thickness of described first cathode layer is
the thickness of described second cathode layer is
Wherein in an embodiment, X layer/Ag layer/X layer that described anode layer is X layer or stacks gradually, X is the one in indium tin oxide (ITO), indium-zinc oxide (IZO), aluminium zinc oxide (AZO).
Wherein in an embodiment, described organic light emitting diodde desplay device comprises contact conductor, the array periphery of described sub-pixel is also provided with bus, described bus covers the subregion of described cathode layer end and described contact conductor, for overlapping cathode layer described in conducting and described contact conductor, described bus is one or more layers stack layer formed in Ag, Al, Cu, Au and alloy thereof, and the thickness of described bus is
Wherein in an embodiment, described cathode layer is also provided with the optical coatings that continuous print covers all described Organic Light Emitting Diodes.
A preparation method for organic light emitting diodde desplay device, comprises the steps:
Substrate forms anode layer;
Described anode layer forms pixel unit layer, and described pixel unit layer comprises the entirely not identical and sub-pixel be arranged in array of some glow colors;
Described pixel unit layer forms cathode layer, and wherein, the cathode electrode layer thickness that the cathode electrode layer thickness that the sub-pixel of at least one glow color is corresponding is corresponding from the sub-pixel of all the other glow colors is different.
Wherein in an embodiment, the described step forming cathode layer in pixel unit layer, specifically comprises: in described pixel unit layer, form the first cathode layer covering all sub-pixels; The sub-pixel that at least one glow color is identical forms the second cathode layer, and the sub-pixel of all glow colors of described second cathode layer not all standing.
Wherein in an embodiment, be also included in the step that anode layer periphery forms bus, described bus, for overlapping cathode layer described in conducting and contact conductor, is also included in the step described cathode layer being formed optical coatings.
Technique scheme of the present invention has the following advantages compared to existing technology:
The anode layer of Organic Light Emitting Diode is not only relevant with microcavity length with the power of the microcavity effect between cathode layer, but also be correlated with the thickness of negative electrode, particularly in top emitting device, the reflectivity of transparent cathode and transmitance all can have influence on the microcavity effect of Organic Light Emitting Diode.A kind of organic light emitting diodde desplay device of the present invention, comprise pixel unit layer, described pixel unit layer comprises the entirely not identical and sub-pixel be arranged in array of some glow colors, cathode electrode layer thickness corresponding for the sub-pixel of wherein at least one glow color is arranged the cathode electrode layer thickness corresponding from the sub-pixel of all the other glow colors different, thus adjust the microcavity effect of the Organic Light Emitting Diode of different glow color, and then improve luminous efficiency and the brightness of described organic light emitting diodde desplay device, to reduce the power consumption of described organic light emitting diodde desplay device.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 1;
Fig. 2 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 2;
Fig. 3 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 3;
Fig. 4 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 4;
Fig. 5 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 5;
Fig. 6 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 6;
Fig. 7 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 7;
Fig. 8 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 8;
Fig. 9 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 9;
Figure 10 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 10;
Figure 11 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 11;
Figure 12 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 12;
Figure 13 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 13;
Figure 14 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 14;
Figure 15 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 15;
Figure 16 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 16;
Figure 17 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 17;
Figure 18 is organic light emitting diodde desplay device cutaway view described in the embodiment of the present invention 18;
Figure 19 is organic light emitting diodde desplay device vertical view described in the embodiment of the present invention 3;
Figure 20 is the vertical view after organic light emitting diodde desplay device described in the embodiment of the present invention 3 arranges bus.
In figure, Reference numeral is expressed as: 1-substrate, 2-anode layer, 31-ruddiness sub-pixel, 32-green glow sub-pixel, 33-blue photons pixel, 34-Y luminescent layer, 4-first cathode layer, 5-second cathode layer, 51-Part I, 52-Part II, 6-bus.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
The present invention can implement in many different forms, and should not be understood to be limited to embodiment set forth herein.On the contrary, provide these embodiments, make the disclosure to be thorough and complete, and design of the present invention fully will be conveyed to those skilled in the art, the present invention will only be limited by claim.In the accompanying drawings, for clarity, the size in layer and region and relative size can be exaggerated.Should be understood that, when element such as layer, region or substrate be referred to as " being formed in " or " being arranged on " another element " on " time, this element can be set directly on another element described, or also can there is intermediary element.On the contrary, when element is referred to as on " being formed directly into " or " being set directly at " another element, there is not intermediary element.
Embodiment 1
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 1, comprises formation pixel unit layer on substrate 1, and described pixel unit layer comprises some the ruddiness sub-pixel 31, green glow sub-pixel 32, the blue photons pixel 33 that are arranged in array.
Described pixel unit layer side correspondence arranges anode layer 2, and opposite side correspondence arranges cathode layer.
As convertible embodiment of the present invention, the structure of described Organic Light Emitting Diode and the same prior art of preparation method, all can realize object of the present invention, belong to protection scope of the present invention.
The cathode layer that each described sub-pixel is corresponding includes the first common cathode layer 4, and in addition, the cathode layer that the sub-pixel of at least one glow color is corresponding comprises the second cathode layer, and the sub-pixel of all glow colors of described second cathode layer not all standing; Stacking upside or the downside being arranged on described first cathode layer of described second cathode layer.
In the present embodiment, described first cathode layer 4 is Mg:Ag alloy-layer, and thickness is
as convertible embodiment of the present invention, described first cathode layer 4 can also be one or more layers stack layer formed in M, Ag and alloy thereof, and wherein M is the one in the low workfunction metal such as Mg, Li, K, Ca, Na, Sr, Cs, Ba, Yb.The thickness of described first cathode layer 4 is
all can realize object of the present invention, belong to protection scope of the present invention.
As shown in Figure 1, second cathode layer described in the present embodiment is Mg:Ag alloy-layer, wherein, second cathode layer comprises Part I 51 (being independently arranged on the part on ruddiness sub-pixel 31) and Part II 52 (being independently arranged on the part on green glow sub-pixel 32), in the present embodiment, Part I 51 is different from the thickness of Part II 52, and the thickness of Part I 51 is
the thickness of Part II 52 is
as other embodiments of the present invention, described second cathode layer can also be one or more layers stack layer formed in Mg, Ag and alloy thereof, or one or more layers stack layer formed in the low workfunction metal such as Li, K, Ca, Na, Sr, Cs, Ba, Yb; The thickness of described second cathode layer is
all can realize object of the present invention, belong to protection scope of the present invention.
X layer/Ag layer/X layer that each described anode layer 2 is X layer or stacks gradually, X is the one in the high-work-function metals such as indium tin oxide (ITO), indium-zinc oxide (IZO), aluminium zinc oxide (AZO) or metal oxide; In the present embodiment, described anode layer 2 is ITO/Ag/ITO layer, and thickness is
as convertible embodiment of the present invention, the thickness of described anode layer 2 can also be
all can realize object of the present invention, belong to protection scope of the present invention.
Described organic light emitting diodde desplay device also comprises other organic layers, and other organic layers described comprise the stacking of a kind of or multilayer in hole injection layer (HIL), electronic barrier layer (EBL), hole transmission layer (HTL), electron transfer layer (ETL), hole blocking layer (HBL), electron injecting layer (EIL).In the present embodiment the structure of ruddiness Organic Light Emitting Diode be m-MTDATA (HIL,
)/NPB (HTL,
)/Bebq2:BAlq (20%): Ir (btp)
2(acac) (6%) (EML,
)/Bebq2 (ETL,
)/Liq (EIL,
)/Mg:Ag
/ Alq3 (CPL,
); The structure of green glow Organic Light Emitting Diode be m-MTDATA (HIL,
)/NPB (HTL,
)/ADN:C545T (5%) (EML,
)/Bebq2 (ETL,
)/Liq (EIL,
)/Mg:Ag
alq3 (CPL,
); The structure of blue light organic emissive diode be m-MTDATA (HIL,
)/NPB (HTL,
)/MADN:DPVBi (7%) (EML,
)/Bebq2 (ETL,
)/Liq
/ Mg:Ag
/ Alq3 (CPL,
).
In the present embodiment, described cathode layer is also provided with continuous print and covers the optical coatings of all described sub-pixels (for clarity, not shown in Fig. 1), described optical coatings is be with the transparent organic material layer or inorganic material layer that gap length, refractive index are high, and thickness is
in the present embodiment, CPL is Alq3 layer, and thickness is
The preparation method of described organic light emitting diodde desplay device, comprises the steps:
S1, on substrate 1 formation anode layer 2; Described substrate 1 can be tft array substrate can be also glass substrate, and the present embodiment is preferably tft array substrate.
S2, on anode layer 2, form pixel unit layer, comprise the ruddiness sub-pixel 31 of array arrangement, green glow sub-pixel 32, blue photons pixel 33.
S3, in ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, formed the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 by universal metal mask plate (open mask).
S4, form the second cathode layer by the position of fine metal mask plate (shadow mask) corresponding ruddiness sub-pixel 31 on described first cathode layer 4, wherein said second cathode layer comprises the Part I 51 be arranged on ruddiness sub-pixel 31 and the Part II 52 be arranged on green glow sub-pixel 32.
S5, on described second cathode layer, form the optical coatings covering described first cathode layer 4 and described second cathode layer.
The same prior art of preparation technology of described anode layer 2, ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, first cathode layer 4, second cathode layer and optical coatings, repeats no more in the present embodiment.
Embodiment 2
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 2, its concrete structure and preparation technology with embodiment 1, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer.
The preparation method of described organic light emitting diodde desplay device, first forms the second cathode layer respectively by fine metal mask plate (shadow mask) on ruddiness sub-pixel 31, green glow sub-pixel 32; In ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 and the second cathode layer is formed again by universal metal mask plate (open mask).
Embodiment 3
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 3, its concrete structure and preparation technology are with embodiment 1, uniquely to arrange continuously with described second cathode layer 5 on green glow sub-pixel 32 and thickness is identical unlike being arranged on ruddiness sub-pixel 31, in the present embodiment, the thickness of the second cathode layer 5 is
as convertible embodiment of the present invention, the thickness of described second cathode layer 5 is
all can realize object of the present invention, belong to protection scope of the present invention.
As shown in figure 20, the array periphery of described all sub-pixels is also provided with bus 6, described bus 6 covers the subregion of the contact conductor in the cathode layer end of each described Organic Light Emitting Diode and described organic light emitting diodde desplay device, for overlapping cathode layer described in conducting and described contact conductor.
Described bus 6 is one or more layers stack layer formed in Ag, Al, Cu, Au and alloy thereof, and the thickness of described bus is
the present embodiment is preferably
thick Ag layer.
As shown in Fig. 3, Figure 19 and Figure 20, the preparation method of described organic light emitting diodde desplay device, comprises the steps:
S1, on substrate 1 formation anode layer 2; Described substrate 1 can be tft array substrate can be also glass substrate, and the present embodiment is preferably tft array substrate.
S2, on anode layer 2, form pixel unit layer, described pixel unit layer comprises ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33.
S3, in ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, formed the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 by universal metal mask plate (open mask).
S4, form the second cathode layer 5 by the position of fine metal mask plate (shadow mask) corresponding ruddiness sub-pixel 31 and corresponding green glow sub-pixel 32 on described first cathode layer 4.
S5, by universal metal mask plate (open mask) anode layer 2 periphery formed bus 6, described bus 6 is for overlapping cathode layer described in conducting and contact conductor.
The same prior art of preparation technology of described anode layer 2, ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 first cathode layer 4, second cathode layer 5, repeats no more in the present embodiment.
Embodiment 4
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 4, its concrete structure and preparation technology with embodiment 3, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer 5.
The preparation method of described organic light emitting diodde desplay device, first forms the second cathode layer 5 by fine metal mask plate (shadow mask) on ruddiness sub-pixel 31, green glow sub-pixel 32; In ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 and the second cathode layer 5 is formed again by universal metal mask plate (open mask).
Embodiment 5
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 5, its concrete structure and preparation technology are with embodiment 1, uniquely be arranged in described ruddiness sub-pixel 31 and blue photons pixel 33 unlike described second cathode layer 5, described green glow sub-pixel 32 do not arranged the second cathode layer 5.And it is identical with described second cathode layer 5 thickness in blue photons pixel 33 to be arranged on ruddiness sub-pixel 31, in the present embodiment is
as convertible embodiment of the present invention, the thickness of described second cathode layer 5 is
all can realize object of the present invention, belong to protection scope of the present invention.
Embodiment 6
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 6, its concrete structure and preparation technology with embodiment 5, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer 5.
The preparation method of described organic light emitting diodde desplay device, first forms the second cathode layer 5 by fine metal mask plate in ruddiness sub-pixel 31, blue photons pixel 33; In ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 and the second cathode layer 5 is formed again by universal metal mask plate.
Embodiment 7
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 7, its concrete structure and preparation technology are with embodiment 1, uniquely be arranged in described green glow sub-pixel 32 and blue photons pixel 33 unlike described second cathode layer 5, described ruddiness sub-pixel 31 do not arranged the second cathode layer 5.And it is identical with described second cathode layer 5 thickness in blue photons pixel 33 to be arranged on green glow sub-pixel 32, in the present embodiment is
as convertible embodiment of the present invention, the thickness of described second cathode layer 5 is
all can realize object of the present invention, belong to protection scope of the present invention.
Embodiment 8
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 8, its concrete structure and preparation technology with embodiment 7, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer 5.
The preparation method of described organic light emitting diodde desplay device, first forms the second cathode layer 5 by fine metal mask plate in green glow sub-pixel 32, blue photons pixel 33; In ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 and the second cathode layer 5 is formed again by universal metal mask plate.
Embodiment 9
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 9, its concrete structure and preparation technology are with embodiment 1, uniquely only be arranged on described ruddiness sub-pixel 31 unlike described second cathode layer 5, described blue photons pixel 33 and described green glow sub-pixel 32 do not arrange the second cathode layer 5.
Embodiment 10
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in Figure 10, its concrete structure and preparation technology with embodiment 9, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer 5.
The preparation method of described organic light emitting diodde desplay device, first forms the second cathode layer 5 by fine metal mask plate on ruddiness sub-pixel 31; In ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 and the second cathode layer 5 is formed again by universal metal mask plate.
Embodiment 11
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in figure 11, its concrete structure and preparation technology are with embodiment 1, uniquely only be arranged on described green glow sub-pixel 32 unlike described second cathode layer 5, described blue photons pixel 33 and described ruddiness sub-pixel 31 do not arrange the second cathode layer 5.
Embodiment 12
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in figure 12, its concrete structure and preparation technology with embodiment 11, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer 5.
The preparation method of described organic light emitting diodde desplay device, first forms the second cathode layer 5 by fine metal mask plate on ruddiness sub-pixel 31; In ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 and the second cathode layer 5 is formed again by universal metal mask plate.
Embodiment 13
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in figure 13, its concrete structure and preparation technology are with embodiment 1, uniquely only be arranged in described blue photons pixel 33 unlike described second cathode layer 5, described green glow sub-pixel 32 and described ruddiness sub-pixel 31 do not arrange the second cathode layer 5.
Embodiment 14
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in figure 14, its concrete structure and preparation technology with embodiment 13, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer 5.
The preparation method of described organic light emitting diodde desplay device, first forms the second cathode layer 5 by fine metal mask plate in blue photons pixel 33; In ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33, the first cathode layer 4 covering ruddiness sub-pixel 31, green glow sub-pixel 32, blue photons pixel 33 and the second cathode layer 5 is formed again by universal metal mask plate.
Embodiment 15
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in figure 15, comprise formation pixel unit layer on substrate 1, its concrete structure and preparation technology, with embodiment 1, uniquely comprise some the gold-tinted sub-pixel, the blue photons pixel that are arranged in array unlike described pixel unit layer.Described gold-tinted sub-pixel comprises the anode layer 2, Y luminescent layer 34 and the cathode layer that stack gradually setting; Described second cathode layer 5 is only arranged on described Y luminescent layer 34.The structure of described gold-tinted sub-pixel be m-MTDATA (HIL,
)/NPB (HTL,
)/CBP
: Ir (BT)
2(acac) (10%) (EML,
)/Bebq2 (ETL,
)/Liq (EIL,
)/Mg:Ag
/ Alq3 (CPL,
).
Embodiment 16
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in figure 16, its concrete structure and preparation technology with embodiment 15, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer 5.
The preparation method of described organic light emitting diodde desplay device, first by fine metal mask plate Y luminescent layer 34, on form the second cathode layer 5; On blue photons pixel 33, Y luminescent layer 34, the first cathode layer 4 covering blue photons pixel 33, Y luminescent layer 34 and the second cathode layer 5 is formed again by universal metal mask plate.
Embodiment 17
The present embodiment provides a kind of organic light emitting diodde desplay device, and as shown in figure 17, its concrete structure and preparation technology, with embodiment 15, are uniquely only arranged in described blue photons pixel 33 unlike described second cathode layer 5.
Embodiment 18
The present embodiment provides a kind of organic light emitting diodde desplay device, as shown in figure 18, its concrete structure and preparation technology with embodiment 17, uniquely unlike the stacked downside being arranged on described first cathode layer 4 of described second cathode layer 5.
The preparation method of described organic light emitting diodde desplay device, first by fine metal mask plate blue photons pixel 33, on form the second cathode layer 5; On blue photons pixel 33, Y luminescent layer 34, the first cathode layer 4 covering blue photons pixel 33, Y luminescent layer 34 and the second cathode layer 5 is formed again by universal metal mask plate.
Comparative example
The present embodiment provides a kind of organic light emitting diodde desplay device, and its concrete structure and preparation technology are with embodiment 1, and the cathode layer uniquely unlike each described sub-pixel is only provided with the first cathode layer 4, not containing the second cathode layer 51,52.
The IVL equipment (i.e. current-voltage-brightness testing equipment) provided by McScience company is tested the organic light emitting diodde desplay device described in above-described embodiment 1 and comparative example, and test data is as shown in the table:
As can be seen from above-mentioned data, after the cathode electrode layer thickness that organic light emitting diodde desplay device of the present invention is corresponding to different glow color sub-pixel adjusts, chromaticity coordinates does not change substantially, when brightness is constant, operating voltage declines, luminous efficiency improves, thus effectively reduces the power consumption of described organic light emitting diodde desplay device.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And thus the apparent change of extending out or variation be still among protection scope of the present invention.
Claims (10)
1. an organic light emitting diodde desplay device, comprise pixel unit layer, described pixel unit layer side correspondence arranges anode layer, opposite side correspondence arranges cathode layer, described pixel unit layer comprises the entirely not identical and sub-pixel be arranged in array of some glow colors, it is characterized in that, the cathode electrode layer thickness that the cathode electrode layer thickness that the sub-pixel of at least one glow color is corresponding is corresponding from the sub-pixel of all the other glow colors is different.
2. organic light emitting diodde desplay device according to claim 1, it is characterized in that, the cathode layer that each described sub-pixel is corresponding includes the first cathode layer, the cathode layer that the sub-pixel of at least one glow color is corresponding comprises the second cathode layer, and the sub-pixel of all glow colors of described second cathode layer not all standing; Stacking upside or the downside being arranged on described first cathode layer of described second cathode layer.
3. organic light emitting diodde desplay device according to claim 2, is characterized in that, described first cathode layer is one or more layers stack layer formed in M, Ag and alloy thereof, and M is the one in Mg, Li, K, Ca, Na, Sr, Cs, Ba, Yb; Described second cathode layer is one or more layers stack layer formed in Mg, Ag and alloy thereof, or one or more layers stack layer formed in Li, K, Ca, Na, Sr, Cs, Ba, Yb.
4. organic light emitting diodde desplay device according to claim 2, is characterized in that, the thickness of described first cathode layer is
the thickness of described second cathode layer is
5. organic light emitting diodde desplay device according to claim 1, it is characterized in that, X layer/Ag layer/X layer that described anode layer is X layer or stacks gradually, X is the one in indium tin oxide (ITO), indium-zinc oxide (IZO), aluminium zinc oxide (AZO).
6. organic light emitting diodde desplay device according to claim 1, it is characterized in that, described organic light emitting diodde desplay device comprises contact conductor, the array periphery of described sub-pixel is also provided with bus, described bus covers the subregion of described cathode layer end and described contact conductor, for overlapping cathode layer described in conducting and described contact conductor, described bus is one or more layers stack layer formed in Ag, Al, Cu, Au and alloy thereof, and the thickness of described bus is
7. the organic light emitting diodde desplay device according to any one of claim 1-6, is characterized in that, described cathode layer is also provided with the optical coatings that continuous print covers all described Organic Light Emitting Diodes.
8. a preparation method for the organic light emitting diodde desplay device described in any one of right 1-7, is characterized in that, comprises the steps:
Substrate forms anode layer;
Described anode layer forms pixel unit layer, and described pixel unit layer comprises the entirely not identical and sub-pixel be arranged in array of some glow colors;
Described pixel unit layer forms cathode layer, and wherein, the cathode electrode layer thickness that the cathode electrode layer thickness that the sub-pixel of at least one glow color is corresponding is corresponding from the sub-pixel of all the other glow colors is different.
9. the preparation method of organic light emitting diodde desplay device according to claim 8, it is characterized in that, the described step forming cathode layer in pixel unit layer, specifically comprises: in described pixel unit layer, form the first cathode layer covering all sub-pixels; The sub-pixel that at least one glow color is identical forms the second cathode layer, and the sub-pixel of all glow colors of described second cathode layer not all standing.
10. the preparation method of organic light emitting diodde desplay device according to claim 8, it is characterized in that, also be included in the step that anode layer periphery forms bus, described bus, for overlapping cathode layer described in conducting and contact conductor, is also included in the step described cathode layer being formed optical coatings.
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