CN105870354A - Organic light-emitting device and manufacturing method thereof and display device - Google Patents
Organic light-emitting device and manufacturing method thereof and display device Download PDFInfo
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- H—ELECTRICITY
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- H10K50/00—Organic light-emitting devices
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Abstract
The invention relates to an organic light-emitting device and a manufacturing method thereof and a display device. The organic light-emitting device comprises a blue sub-pixel region and the other sub-pixel regions of at least two colors; an organic light-emitting display device comprises a metal electrode layer, an organic light-emitting layer, a transparent electrode layer, an half-transparent and half-reflecting layer and a color filter layer which are sequentially arranged along the thickness direction; the half-transparent and half-reflecting layer is arranged in the blue sub-pixel region of the organic light-emitting display device; a micro-cavity structure for emitting blue light is formed between the half-transparent and half-reflecting layer and the metal electrode layer; and the color filter layer is colorless and transparent in the blue sub-pixel region, and comprises color film structures of corresponding colors in the sub-pixel regions of the other colors. A blue color filter is replaced with the micro-cavity structure between the half-transparent and half-reflecting layer and the metal electrode layer; and the current efficiency of a blue sub-pixel is improved on the basis of keeping high color purity, so that the power consumption of the blue sub-pixel is reduced; and the lifetime of the blue sub-pixel is prolonged.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic electroluminescent device, a manufacturing method thereof and a display device.
Background
Organic Light Emitting Diode (OLED) devices have attracted much attention because of their advantages of self-luminescence, rich colors, fast response speed, wide viewing angle, Light weight, thin thickness, low power consumption, and flexible display. Moreover, a display device manufactured using the organic electroluminescent device is considered as a display device having a great application prospect.
In order to embody the wide color gamut of the OLED, different sub-pixels of the current organic electroluminescent device manufactured by a hybrid process need to further improve the color purity through a color filter, which leads to a decrease in the current efficiency of the organic electroluminescent device, especially for a blue sub-pixel with a relatively low current efficiency. In order to ensure the normal display function of the organic electroluminescent device, the power consumption of the blue sub-pixel needs to be increased, which not only increases the power consumption of the blue sub-pixel, but also shortens the lifetime of the blue sub-pixel.
Disclosure of Invention
In view of the above defects, the present invention provides an organic electroluminescent device, a manufacturing method thereof, and a display device, which can improve the current efficiency of a blue sub-pixel while ensuring a high color purity, thereby reducing the power consumption of the blue sub-pixel and prolonging the life of the blue sub-pixel.
In a first aspect, the present invention provides an organic electroluminescent device having a blue sub-pixel region and at least two other sub-pixel regions, the organic electroluminescent device comprising a metal electrode layer, an organic light emitting layer, a transparent electrode layer, a semi-transparent semi-reflective layer and a color filter layer sequentially arranged in a thickness direction; wherein,
the semi-transmitting and semi-reflecting layer is arranged in a blue sub-pixel area of the organic light-emitting display device, and forms a micro-cavity structure for emitting blue light with the metal electrode layer;
the color filter layer is colorless and transparent in the blue sub-pixel region, and comprises color film structures with corresponding colors in the sub-pixel regions with other colors.
Optionally, the organic light emitting layer includes a blue light emitting layer formed over the entire surface.
Optionally, the organic light emitting layer includes strip light emitting structures of the other at least two colors, which are disposed in the same layer.
Optionally, the semi-transparent semi-reflective layer is a metal film with a thickness of 5-20 nm.
Optionally, the color filter layer includes the color film structures of the other at least two colors, and a transparent planarization layer for compensating a level difference between the color film structures of the other at least two colors.
In a second aspect, the present invention provides a method for manufacturing an organic electroluminescent device, the organic electroluminescent device having sub-pixel regions of blue and at least two other colors, the method comprising:
forming a color filter layer on a substrate, wherein the color filter layer is colorless and transparent in the blue sub-pixel region, and comprises color film structures with corresponding colors in the sub-pixel regions with other colors;
forming a pattern comprising a semi-transparent semi-reflecting layer on the color filter layer, wherein the semi-transparent semi-reflecting layer is arranged in a blue sub-pixel area of the organic light-emitting display device;
and sequentially forming a transparent electrode layer, an organic light-emitting layer and a metal electrode layer on the color filter layer and the semi-transparent semi-reflective layer so as to form a micro-cavity structure for emitting blue light between the semi-transparent semi-reflective layer and the metal electrode layer.
Optionally, the color filter layer with form transparent electrode layer, organic luminescent layer and metal electrode layer in proper order on the semi-transparent semi-reflecting layer, so that semi-transparent semi-reflecting layer with form the microcavity structure of outgoing blue light between the metal electrode layer, include:
forming a pattern comprising a transparent electrode layer on the color filter layer and the transflective layer;
forming an organic light emitting layer on the transparent electrode layer, wherein the organic light emitting layer comprises a blue light emitting layer formed on the whole surface;
and forming a metal electrode layer on the organic light-emitting layer.
Optionally, the forming an organic light emitting layer on the transparent electrode layer includes:
forming a first organic functional layer on the transparent electrode layer;
forming the strip-shaped light-emitting structures of the other at least two colors on the first organic functional layer;
forming the whole blue light-emitting layer on the transparent electrode layer and the strip-shaped light-emitting structures of the other at least two colors;
and forming a second organic functional layer on the blue light emitting layer.
Optionally, the thickness of the second organic functional layer is determined according to at least one of the thickness of the formed transparent electrode layer, the thickness of the formed first organic functional layer, the thickness of the formed strip-shaped light emitting structure, and the thickness of the formed blue light emitting layer, so that the microcavity structure formed after the metal electrode layer is formed has a preset size in the thickness direction.
Optionally, the semi-transparent semi-reflective layer is a metal film with a thickness of 5-20 nm.
Optionally, the forming a color filter layer on the substrate includes:
forming the color film structures of the other at least two colors on the substrate;
and forming a transparent planarization layer on the substrate and the color film structures of the other at least two colors to compensate the segment difference between the color film structures of the other at least two colors.
In a third aspect, the present invention provides a display apparatus comprising the above-described organic electroluminescent device.
In the organic electroluminescent device, the manufacturing method thereof and the display device, a microcavity structure is formed between the semi-transparent semi-reflective layer and the metal electrode layer, and blue light meeting the requirement of color purity can be filtered out by utilizing the microcavity effect of the microcavity structure; meanwhile, the color filter layer is colorless and transparent in the blue sub-pixel area, so that the current efficiency of the blue sub-pixel can be improved compared with the mode of arranging the color filter in the blue sub-pixel area in the prior art. Therefore, in the invention, the microcavity structure formed between the transflective layer and the metal electrode layer is used to replace a blue color filter, and the current efficiency of the blue sub-pixel is improved on the basis of keeping high color purity, so that the power consumption of the blue sub-pixel is reduced, and the service life of the blue sub-pixel is prolonged.
Drawings
The characteristic information and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:
FIG. 1 is a schematic structural diagram of an embodiment of an organic electroluminescent device according to the present invention;
description of reference numerals:
1-a substrate base plate; 2-red color film structure; 3-a green color film structure; 4-a transparent planarization layer; 5-a semi-permeable and semi-reflective layer; 6-a transparent electrode layer; 7-a first organic functional layer; 8-red strip-shaped light-emitting structures; 9-green strip-shaped light-emitting structures; 10-a blue light-emitting layer; 11-a second organic functional layer; 12-metal electrode layer.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In a first aspect, the present invention provides an organic electroluminescent device having a sub-pixel region of blue and at least two other colors, the organic electroluminescent device comprising a metal electrode layer, an organic light emitting layer, a transparent electrode layer, a semi-transparent semi-reflective layer and a color filter layer sequentially arranged in a thickness direction; wherein,
the semi-transparent semi-reflective layer is arranged in the blue sub-pixel area of the organic light-emitting display device, and forms a micro-cavity structure for emitting blue light with the metal electrode layer;
the color filter layer is colorless and transparent in the blue sub-pixel region, and the color film structures with corresponding colors are included in the sub-pixel regions with other colors.
In the organic electroluminescent device provided by the invention, a microcavity structure is formed between the semi-transparent semi-reflective layer and the metal electrode layer, and blue light meeting the requirement of color purity can be filtered out by utilizing the microcavity effect of the microcavity structure; meanwhile, the color filter layer is colorless and transparent in the blue sub-pixel area, so that the current efficiency of the blue sub-pixel can be improved compared with the mode of arranging the color filter in the blue sub-pixel area in the prior art. Therefore, in the invention, the microcavity structure formed between the transflective layer and the metal electrode layer is used to replace a blue color filter, so that the current efficiency of the blue sub-pixel is improved on the basis of keeping high color purity, and the problem that the current efficiency of the blue sub-pixel is reduced due to the use of the color filter in the existing organic light-emitting display device is solved. In addition, because the color filters are still used in the sub-pixel regions of other colors to improve the color purity, the current efficiency among the sub-pixels of different colors can be balanced, which is beneficial to the improvement of the device performance.
Some specific embodiments of the organic electroluminescent device provided by the first aspect of the present invention are described below with reference to the drawings.
Referring to fig. 1, an organic electroluminescent device according to an embodiment of the present invention has blue, red, and green sub-pixel regions, and includes a color filter layer, a semi-transparent and semi-reflective layer 5, a transparent electrode layer 6, an organic light emitting layer, and a metal electrode layer 12, which are sequentially disposed on a substrate 1 in a thickness direction, wherein:
the color filter layer is colorless and transparent in the blue sub-pixel region, and comprises a red color film structure 2 arranged in the red sub-pixel region, a green color film structure 3 arranged in the green sub-pixel region, and a transparent planarization layer 4 for compensating a section difference between the red color film structure 2 and the green color film structure 3;
the semi-transparent semi-reflective layer 5 is a metal film with the thickness of 5-20 nm, is arranged in the blue sub-pixel region, and forms a micro-cavity structure for emitting blue light with the metal electrode layer 12;
the organic light emitting layer comprises a first organic functional layer 7, a red strip light emitting structure 8, a green strip light emitting structure 9, a blue light emitting layer 10 and a second organic functional layer 11; the first organic functional layer 7 is arranged between the strip-shaped light-emitting structure and the transparent electrode layer 6, the red strip-shaped light-emitting structure 8 and the green strip-shaped light-emitting structure 9 are arranged in the same layer, the blue light-emitting layer 10 is formed by the whole surface, and the second organic functional layer 11 is arranged between the metal electrode layer 12 and the blue light-emitting layer 10.
It is to be understood that the red stripe light-emitting structure 8 is a stripe light-emitting structure capable of emitting red light, the green stripe light-emitting structure 9 is a stripe light-emitting structure capable of emitting green light, and the blue light-emitting layer 10 is a light-emitting structure capable of emitting blue light.
The operation principle of the organic electroluminescent device provided in this embodiment is explained as follows:
after a working voltage is applied between the metal electrode layer 12 and the transparent electrode layer 6, the blue light emitting layer 10 in the organic light emitting layer emits blue light, the red strip light emitting structure 8 emits red light, the green strip light emitting structure 9 emits green light, the emitted red light and the emitted green light are transmitted out through the transparent electrode layer 6, the transparent planarization layer 4 and the color film structure of the corresponding color, and the color film structure of the corresponding color filters light of the corresponding color to improve the color purity of the light of the corresponding color. When blue light emitted by the blue light emitting layer 10 reaches the transflective layer 5 through the transparent electrode layer 6, because the transflective layer 5 has a transflective function, a part of the light is transmitted, another part of the light is reflected into a microcavity structure formed between the transflective layer 5 and the metal electrode layer 12, the part of the light reflected by the transflective layer 5 is reflected to the transflective layer 5 by the metal electrode layer 12, and a visible part of the blue light oscillates in the microcavity structure, which is a so-called microcavity effect. In practical application, because the cavity lengths of the microcavity structures are different, the wavelengths of light which can be transmitted by the microcavity structures are different, so that blue light with preset wavelengths can be obtained by manufacturing the microcavity structures with preset cavity lengths, and the blue light is ensured to have higher color purity. The blue light emitted by the microcavity structure is not filtered by the color film structure any more, so that the current efficiency can be improved, the power consumption of the blue sub-pixel is reduced, and the service life of the blue sub-pixel is prolonged.
In the above description of the operating principle, the light emitting process of the organic light emitting layer is specifically as follows: in the case where the metal electrode layer 12 serves as a positive electrode and the transparent electrode layer 6 serves as a negative electrode, the second organic functional layer 11 transports holes into the light-emitting structure, the first organic functional layer 7 transports electrons into the light-emitting structure, and the electrons and holes, when combined in the light-emitting structure, excite the light-emitting structure to emit light. Alternatively, in the case where the metal electrode layer 12 serves as a negative electrode and the transparent electrode layer 6 serves as a positive electrode, the second organic functional layer 11 transports electrons into the light emitting structure, the first organic functional layer 7 transports holes into the light emitting structure, and the electrons and holes excite the light emitting structure to emit light when they are combined in the light emitting structure.
In this embodiment, the organic light emitting layer is a blue light emitting layer 10 formed on the whole surface, which has the advantages of simple process and high yield. Of course, in practical applications, in some alternative embodiments, it is not necessary to use the entire blue light emitting layer 10, for example, a stripe light emitting structure, and the technical solution can also achieve the basic purpose of increasing the current efficiency of the blue sub-pixel on the basis of maintaining high color purity, and therefore, should also fall within the protection scope of the present invention.
In this embodiment, the red stripe light-emitting structure 8 and the green stripe light-emitting structure 9 are adopted in the organic light-emitting layer, and the light-emitting structures of the two colors are arranged on the same layer, so that the organic light-emitting layer can be formed in a printing manner during manufacturing, is convenient to manufacture, and is beneficial to saving materials. Of course, in practical applications, in some alternative embodiments, it is not necessary to use a stripe-shaped light emitting structure for other colors than blue, and it is not necessary to arrange the stripe-shaped light emitting structure in layers, and the technical solution can also achieve the basic purpose of increasing the current efficiency of the blue sub-pixel on the basis of maintaining high color purity, and therefore, the present invention should also fall into the protection scope of the present invention.
In this embodiment, the organic light emitting layer composed of the light emitting structure (the blue light emitting layer 10, the red stripe light emitting structure 8, and the green stripe light emitting structure 9) and the functional layer is used for emitting light, and certainly, in practical applications, in some alternative embodiments, the organic light emitting layer composed of the light emitting structure and the functional layer is not necessary to be used, and the organic light emitting layer with other structures may be used for emitting light.
In the embodiment, the transflective layer 5 is a metal thin film with a thickness of 5 to 20nm, and generally, the thickness of other structures such as a color filter layer is micrometer, and the thickness of the transflective layer 5 is nanometer, which is much thinner than other structures such as a color filter layer, thereby facilitating the implementation of the transflective function of the metal thin film. Certainly, in practical applications, in some alternative embodiments, the semi-transparent and semi-reflective layer 5 does not need to adopt a metal thin film with a thickness of 5 to 20nm, in practical applications, a material for manufacturing the semi-transparent and semi-reflective layer may be selected according to needs, and the thickness of the material may also be set according to the material, as long as the manufactured structure has the semi-transparent and semi-reflective function, and the corresponding technical scheme is within the protection scope of the present invention.
Although the organic electroluminescent device having blue, red and green sub-pixel regions is described in this embodiment, in some alternative embodiments, the organic electroluminescent device does not necessarily have red and green sub-pixel regions, and for the sub-pixel regions having blue and at least two other arbitrary colors (for example, yellow, green and purple), the corresponding color filter layer includes a color filter structure of the at least two other arbitrary colors, and the technical solution can also achieve the basic purpose of improving the current efficiency of the blue sub-pixel on the basis of maintaining high color purity, and therefore, should also fall within the protection scope of the present invention.
In this embodiment, the transparent planarization layer 4 is used to compensate for the step difference between the red color film structure 2 and the green color film structure 3, so that the transflective layer 5, the transparent electrode layer 6, and the like can be conveniently manufactured. Of course, in practical applications, in some alternative embodiments, the transparent planarization layer 4 does not necessarily only compensate for the step difference between the red color film structure 2 and the green color film structure 3, for example, for an organic electroluminescent device having blue, yellow, green and purple sub-pixel regions, the transparent planarization layer needs to compensate for the step difference between the yellow, green and purple color film structures. In addition, it is not necessary to use the transparent planarization layer 4 to compensate for the step difference between the color film structures of different colors, and the technical solution can achieve the basic purpose of increasing the current efficiency of the blue sub-pixel on the basis of maintaining high color purity, and therefore, the invention also falls within the protection scope of the present invention.
In a second aspect, the present invention provides a method for fabricating an organic electroluminescent device having sub-pixel regions of blue and at least two other colors, the method comprising:
forming a color filter layer on the substrate, wherein the color filter layer is colorless and transparent in the blue sub-pixel region, and comprises color film structures with corresponding colors in the sub-pixel regions with other colors;
forming a pattern including a transflective layer on the color filter layer, the transflective layer being disposed in a blue sub-pixel region of the organic light emitting display device;
and sequentially forming a transparent electrode layer, an organic light-emitting layer and a metal electrode layer on the color filter layer and the semi-transparent semi-reflective layer so as to form a micro-cavity structure for emitting blue light between the semi-transparent semi-reflective layer and the metal electrode layer.
According to the manufacturing method of the second aspect of the present invention, the organic electroluminescent device of the first aspect of the present invention can be obtained, and therefore the manufacturing method of the second aspect of the present invention has the same beneficial effects as the organic electroluminescent device of the first aspect of the present invention, and the details are not repeated here.
In a specific implementation, a specific process of sequentially forming the transparent electrode layer, the organic light emitting layer, and the metal electrode layer on the color filter layer and the transflective layer may include:
forming a pattern comprising a transparent electrode layer on the color filter layer and the transflective layer;
forming an organic light emitting layer on the transparent electrode layer, the organic light emitting layer including a blue light emitting layer formed over an entire surface;
and forming a metal electrode layer on the organic light emitting layer.
Here, the blue light emitting layer is formed over the entire surface, and thus, the process is simple and the yield is high. In practical applications, the blue light emitting layer does not have to be formed by the whole surface in some alternative embodiments, for example, a strip-shaped light emitting structure may be adopted, and the organic electroluminescent device manufactured by the manufacturing method thereof can also achieve the basic purpose of increasing the current efficiency of the blue sub-pixel on the basis of maintaining high color purity, and thus, should also fall within the protection scope of the present invention.
In a specific implementation, the process of forming the organic light emitting layer on the transparent electrode layer may include:
forming a first organic functional layer on the transparent electrode layer;
forming strip-shaped light-emitting structures of at least two colors except blue on the first organic functional layer;
forming a whole blue light-emitting layer on the transparent electrode layer and the strip-shaped light-emitting structures with at least two other colors;
a second organic functional layer is formed on the blue light emitting layer.
In a specific operation, the first organic functional layer, the strip-shaped light emitting structure, the second organic functional layer and the like may be formed by evaporation, and the blue light emitting layer may be formed by a solution process. However, since the solution process is not easy to control the preparation thickness, the thickness of each layer that has been formed is determined before the second organic functional layer is formed by evaporation, so as to ensure that the cavity length of the formed microcavity structure has a predetermined size, so that the microcavity structure can emit blue light with high color purity.
Of course, if the thickness of one or more of the layers is known, only at least one of the thickness of the transparent electrode layer formed, the thickness of the first organic functional layer formed, the thickness of the stripe-shaped light-emitting structure formed, and the thickness of the blue light-emitting layer formed may be determined when the second organic functional layer is formed by evaporation, and then the thickness of the second organic functional layer may be determined according to the determined thickness, so that the microcavity structure formed after the metal electrode layer is formed has a predetermined size in the thickness direction.
In addition to the advantages of simple process and high yield of the blue light emitting layer formed by the whole surface, the strip light emitting structure is adopted for the other at least two colors, so that the blue light emitting layer can be formed by printing during manufacturing, the manufacturing is convenient, and the material saving is facilitated. In practical applications, of course, in some alternative embodiments, the strip-shaped light emitting structure is not necessary for other colors than blue, and the organic electroluminescent device manufactured by the manufacturing method can achieve the basic purpose of increasing the current efficiency of the blue sub-pixel on the basis of maintaining high color purity, and therefore, the present invention also falls within the protection scope of the present invention.
In specific implementation, the semi-transparent semi-reflective layer can be a metal film with a thickness of 5-20 nm. Certainly, in practical applications, in some alternative embodiments, the semi-transparent and semi-reflective layer does not need to adopt a metal thin film with a thickness of 5 to 20nm, in practical applications, a material for manufacturing the semi-transparent and semi-reflective layer can be selected according to needs, the thickness of the semi-transparent and semi-reflective layer can also be set according to the material, as long as the manufactured structure has the semi-transparent and semi-reflective function, and the corresponding technical scheme is within the protection scope of the present invention.
In particular implementations, forming a color filter layer on a substrate can include:
forming color film structures of at least two colors except blue on the substrate;
and forming a transparent planarization layer on the substrate and the color film structures of the other at least two colors to compensate the segment difference between the color film structures of the other at least two colors.
Here, the transparent planarization layer is used for compensating the level difference between the color film structures of the other at least two colors, so that the manufacture of the transflective layer, the transparent electrode layer and the like can be facilitated. In some alternative embodiments, it is not necessary to compensate for the step difference between the color film structures of different colors by using the transparent planarization layer, and the organic electroluminescent device manufactured by the manufacturing method can achieve the basic purpose of increasing the current efficiency of the blue sub-pixel on the basis of maintaining high color purity, and thus it is within the scope of the present invention.
It can be understood that the specific structure of the organic electroluminescent device may be represented in various different forms, and the corresponding manufacturing method thereof may also be changed accordingly, and here, the manufacturing method of the organic electroluminescent device in fig. 1 is only taken as an example for description, and the manufacturing methods of the organic electroluminescent devices with other structures are not repeated. The method for manufacturing the organic electroluminescent device shown in fig. 1 specifically includes:
s100, forming a red color film structure 2 in a red sub-pixel region of the substrate base plate 1, and forming a green color film structure 3 in a green sub-pixel region of the substrate base plate 1;
s200, forming a transparent planarization layer 4 on the substrate base plate 1 and the color film structures 2 and 3 to compensate for a section difference between the red color film structure 2 and the green color film structure 3, wherein the transparent planarization layer 4 on the substrate base plate 1 and the color film structures 2 and 3 form a color filter layer, and the color filter layer is colorless and transparent in a blue sub-pixel region;
s300, forming a pattern comprising a semi-transparent semi-reflective layer 5 on the color filter layer, wherein the semi-transparent semi-reflective layer 5 is arranged in the blue sub-pixel area;
s400, sequentially forming a transparent electrode layer 6, an organic light emitting layer and a metal electrode layer 12 on the color filter layer and the semi-transparent and semi-reflective layer 5 so as to form a micro-cavity structure for emitting blue light between the semi-transparent and semi-reflective layer 5 and the metal electrode layer 12;
wherein, the specific process of S400 includes the following steps not shown in the figure:
s401, forming a pattern comprising a transparent electrode layer 6 on the color filter layer and the semi-transparent and semi-reflective layer 5;
s402, forming a first organic functional layer 7 on the transparent electrode layer 6;
s403, forming red stripe light emitting structures 8 and green stripe light emitting structures 9 on the first organic functional layer 7;
s404, forming a whole blue light-emitting layer 10 on the strip-shaped light-emitting structures 8 and 9;
s405, forming a second organic functional layer 11 on the blue light emitting layer 10;
s406, a metal electrode layer 12 is formed on the second organic functional layer 11.
In fact, experiments prove that the blue color purity of the organic electroluminescent device prepared by the preparation method is almost the same as that of the traditional organic electroluminescent device, but the current efficiency of the organic electroluminescent device prepared by the preparation method is more than twice of that of the traditional organic electroluminescent device.
In a third aspect, the present invention also provides a display apparatus comprising any one of the above organic electroluminescent devices.
In a specific implementation, the display device herein may be: any product or component with a display function, such as a display panel, electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention, and the technical solutions are all covered in the scope of the description of the present invention.
Claims (12)
1. An organic electroluminescent device has sub-pixel regions of blue and at least two other colors, and is characterized in that the organic electroluminescent device comprises a metal electrode layer, an organic light-emitting layer, a transparent electrode layer, a semi-transparent semi-reflective layer and a color filter layer which are sequentially arranged along the thickness direction; wherein,
the semi-transmitting and semi-reflecting layer is arranged in a blue sub-pixel area of the organic light-emitting display device, and forms a micro-cavity structure for emitting blue light with the metal electrode layer;
the color filter layer is colorless and transparent in the blue sub-pixel region, and the color film structures with corresponding colors are included in the sub-pixel regions with at least two other colors.
2. The device of claim 1, wherein the organic light emitting layer comprises a globally formed blue light emitting layer.
3. The device of claim 1, wherein the organic light emitting layer comprises stripe light emitting structures of the at least two other colors disposed in the same layer.
4. The device according to claim 1, wherein the transflective layer is a metal thin film having a thickness of 5 to 20 nm.
5. The device according to claim 1, wherein the color filter layer comprises the color film structures of the at least two other colors, and a transparent planarization layer for compensating for a level difference between the color film structures of the at least two other colors.
6. A method of fabricating an organic electroluminescent device having sub-pixel regions of blue and at least two other colors, the method comprising:
forming a color filter layer on a substrate, wherein the color filter layer is colorless and transparent in the blue sub-pixel region, and comprises color film structures with corresponding colors in the sub-pixel regions with other colors;
forming a pattern comprising a semi-transparent semi-reflecting layer on the color filter layer, wherein the semi-transparent semi-reflecting layer is arranged in a blue sub-pixel area of the organic light-emitting display device;
and sequentially forming a transparent electrode layer, an organic light-emitting layer and a metal electrode layer on the color filter layer and the semi-transparent semi-reflective layer so as to form a micro-cavity structure for emitting blue light between the semi-transparent semi-reflective layer and the metal electrode layer.
7. The method according to claim 6, wherein the sequentially forming a transparent electrode layer, an organic light emitting layer and a metal electrode layer on the color filter layer and the transflective layer to form a micro-cavity structure for emitting blue light between the transflective layer and the metal electrode layer comprises:
forming a pattern comprising a transparent electrode layer on the color filter layer and the transflective layer;
forming an organic light emitting layer on the transparent electrode layer, wherein the organic light emitting layer comprises a blue light emitting layer formed on the whole surface;
and forming a metal electrode layer on the organic light-emitting layer.
8. The method of claim 7, wherein forming an organic light emitting layer on the transparent electrode layer comprises:
forming a first organic functional layer on the transparent electrode layer;
forming the strip-shaped light-emitting structures of the other at least two colors on the first organic functional layer;
forming the whole blue light-emitting layer on the transparent electrode layer and the strip-shaped light-emitting structures of the other at least two colors;
and forming a second organic functional layer on the blue light emitting layer.
9. The method according to claim 8, wherein the thickness of the second organic functional layer is determined according to at least one of the thickness of the formed transparent electrode layer, the thickness of the formed first organic functional layer, the thickness of the formed stripe-shaped light emitting structure, and the thickness of the formed blue light emitting layer, so that the microcavity structure formed after the metal electrode layer is formed has a predetermined size in a thickness direction.
10. The method according to claim 6, wherein the semi-transparent and semi-reflective layer is a metal thin film with a thickness of 5-20 nm.
11. The method of claim 6, wherein forming a color filter layer on a substrate comprises:
forming the color film structures of the other at least two colors on the substrate;
and forming a transparent planarization layer on the substrate and the color film structures of the other at least two colors to compensate the segment difference between the color film structures of the other at least two colors.
12. A display device comprising the organic electroluminescent device according to any one of claims 1 to 5.
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| CN108258023A (en) * | 2018-01-26 | 2018-07-06 | 京东方科技集团股份有限公司 | Show backboard and preparation method thereof, display panel and display device |
| CN111106155A (en) * | 2019-12-30 | 2020-05-05 | 武汉天马微电子有限公司 | Display panel and display device |
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| CN108258023B (en) * | 2018-01-26 | 2021-01-15 | 京东方科技集团股份有限公司 | Display back plate and manufacturing method thereof, display panel and display device |
| CN111106155A (en) * | 2019-12-30 | 2020-05-05 | 武汉天马微电子有限公司 | Display panel and display device |
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| GB2615876B (en) * | 2021-12-30 | 2024-09-18 | Lg Display Co Ltd | Display apparatus |
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