CN108389978B - Organic light-emitting display panel and organic light-emitting display device thereof - Google Patents
Organic light-emitting display panel and organic light-emitting display device thereof Download PDFInfo
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
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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]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
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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
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
The invention provides an organic light-emitting display panel and an organic light-emitting display device thereof, relates to the technical field of display, and is used for improving viewing angle color cast under a large viewing angle. The organic light-emitting display panel comprises an organic light-emitting device, the organic light-emitting device comprises a cathode, an anode and an organic layer positioned between the cathode and the anode, and the cathode, the anode and the organic layer form a microcavity; the organic layer comprises a hole transport layer, a light emitting layer and an electron transport layer, and the hole transport layer, the light emitting layer and the electron transport layer are sequentially arranged in the direction of the anode facing the cathode; the organic light-emitting device comprises a first microcavity and a second microcavity adjacent to the first microcavity, and the light-emitting colors of the first microcavity and the second microcavity are the same; the thickness of the hole transport layer in the first microcavity is larger than that of the hole transport layer in the second microcavity, and the thickness of the electron transport layer in the first microcavity is smaller than that of the electron transport layer in the second microcavity. The organic light emitting display panel is suitable for a display device.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to an organic light emitting display panel and an organic light emitting display device thereof.
Background
The most information-receiving of human sensory organs is the visual organ (eye), and people are increasingly required to utilize abundant visual information in production and life, so that display technology plays a very important role in the human society today. Display technology is emerging from the present, the technology development is also very rapid, and with the development of society and the continuous improvement of human demand for living of materials, the current display technology is rapidly advancing towards high contrast, high resolution, full-color display, low power consumption, high reliability, long service life and thinness and lightness.
Among them, the Organic Light-Emitting Diode (OLED) display device has the advantages of self-luminescence, fast response speed, wide viewing angle, high definition, high brightness, strong bending resistance, low power consumption, etc., and is gradually becoming a powerful competitor of the liquid crystal display panel, and is known as the next generation of illusive display technology.
The viewing angle color cast is a ubiquitous and urgent problem to be solved in the OLED display device.
Disclosure of Invention
The embodiment of the invention provides an organic light-emitting display panel and an organic light-emitting display device thereof, which are used for improving viewing angle color cast under a large viewing angle.
In a first aspect, the present invention provides an organic light emitting display panel including:
an organic light emitting device comprising a cathode and an anode, and an organic layer located between the cathode and the anode, the cathode, the anode, and the organic layer forming a microcavity;
the organic layer comprises a hole transport layer, a light emitting layer and an electron transport layer, and the hole transport layer, the light emitting layer and the electron transport layer are sequentially arranged in the direction of the anode facing the cathode;
the organic light-emitting device comprises a first microcavity and a second microcavity adjacent to the first microcavity, and the first microcavity and the second microcavity have the same light-emitting color;
the thickness of the hole transport layer in the first microcavity is greater than that of the hole transport layer in the second microcavity, and the thickness of the electron transport layer in the first microcavity is less than that of the electron transport layer in the second microcavity.
In a second aspect, the present invention provides an organic light emitting display device including the organic light emitting display panel according to the first aspect of the present invention.
Any one of the above technical solutions has the following beneficial effects:
in this embodiment, the thickness of the hole transport layer in the first microcavity is greater than that of the hole transport layer in the second microcavity, and the thickness of the electron transport layer in the first microcavity is less than that of the electron transport layer in the second microcavity, that is, in the direction from the anode to the cathode, for the organic light emitting device with the same light emission color, the two microcavities have two microcavities, and the optical lengths of the two microcavities are different due to the difference of the light emitting layers (light emitting positions), so that light in any one microcavity enters another microcavity under a large viewing angle, and then the wide-angle interference thereof is destroyed, so that the light can be transmitted out along the direction, thereby improving the viewing angle color shift, especially the viewing angle color shift under the large viewing angle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 12 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 13 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 14 is a schematic structural diagram of an organic light emitting display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the microcavities in embodiments of the present invention, these microcavities should not be limited to these terms. These terms are only used to distinguish microcavities from one another. For example, a first microcavity may also be referred to as a second microcavity and, similarly, a second microcavity may also be referred to as a first microcavity without departing from the scope of embodiments of the invention.
Before the present embodiment is described in detail, the structure of the organic light emitting display panel will be briefly described:
as shown in fig. 1, which is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention, an organic light emitting display panel 1 includes a first substrate 11, a plurality of organic light emitting devices 131 disposed on a side surface of the first substrate 11, each of the organic light emitting devices 131 includes an anode 12, a cathode 14, and an organic layer 13 disposed between the anode 12 and the cathode 14, the anode 12 is in contact with a side surface of the first substrate 11, and the cathode 14 is located on a side surface of the organic layer 13 facing away from the first substrate 11.
It can be understood that the first substrate 11 in this embodiment may be a flexible substrate, and the corresponding organic light emitting display panel 1 may be a flexible organic light emitting display panel, and the flexible organic light emitting display panel has special effects of low power consumption and being bendable, and is suitable for various display devices, especially for wearable display devices. Optionally, the flexible substrate is made of polyester imide or polyethylene terephthalate resin, in addition, the first substrate 11 may also be a rigid substrate, and the corresponding organic light emitting display panel is a rigid organic light emitting display panel. In fact, the material of the organic light emitting display panel is not particularly limited in this embodiment.
In this embodiment, a positive voltage may be applied to the anode 12 during electroluminescence. The material of the anode 12 in this embodiment may be indium tin oxide. Specifically, the anode 12 includes at least a reflective film, which may be on a surface of the anode 12 facing away from the first substrate 11, and the material of the reflective film may be silver. The anode 12 may further include a transparent conductive film on a surface of the reflective film facing away from the first substrate 11, and the transparent conductive film may be made of indium tin oxide or indium zinc oxide.
In this embodiment, a negative voltage may be applied to the cathode 14 during electroluminescence. The material of the cathode 14 may be a low-function metal material such as Ag, Al, Ca, In, Li, Mg, or a low-work-function composite metal material. The material of the cathode 14 in this example may be one of a silver alloy, a silver-ytterbium alloy, or a silver-rare earth metal alloy.
It is understood that the organic light emitting display panel 1 has m light emitting colors, m is an integer greater than or equal to 3, and the exemplary embodiment may include three light emitting colors, red, green and blue, respectively, and each organic light emitting device 131 corresponds to one light emitting color.
With continued reference to fig. 1, the organic light emitting display panel 1 in this example may be understood as a top emission organic light emitting display panel, that is, the anode 12 may be understood as a total reflection anode, and the cathode 14 may be understood as a semi-transparent cathode, the cathode being disposed at a side away from the first substrate 11. When the length of the microcavity and the wavelength of the light wave satisfy a certain relationship, the light with a specific wavelength (the wavelength of a certain monochromatic light) can be enhanced, the spectrum is narrowed, and the microcavity effect is generated. The microcavity effect has the functions of selecting, narrowing and enhancing a light source, and is often used to improve the chromaticity of the device, enhance the emission intensity of a specific wavelength, change the light emission color of the device, and the like.
In the prior art, the microcavity effect includes two interference modes, namely wide-angle interference and multi-beam interference, wherein the wide-angle interference affects the viewing angle characteristics of the device, that is, the luminance difference and chromaticity drift are caused by the shift of the light-emitting peak along with the shift of the viewing angle, and particularly under a large viewing angle, the microcavity effect has poor optical properties and more serious color cast.
In order to solve the above problems, the inventor designs the following technical solutions:
in this embodiment, as shown in fig. 2 and fig. 3, fig. 2 and fig. 3 are schematic structural diagrams of an organic light emitting display panel provided in an embodiment of the present invention, and as shown in fig. 2, the organic light emitting display panel 1 includes: an organic light emitting device 131, the organic light emitting device 131 including a cathode 14 and an anode 12, and an organic layer 13 disposed between the cathode 14 and the anode 12, the cathode 14, the anode 12, and the organic layer 13 constituting a microcavity 2. The organic layer 13 includes a hole transport layer 132, a light emitting layer 133, and an electron transport layer 134, and the hole transport layer 132, the light emitting layer 133, and the electron transport layer 134 are sequentially disposed in a direction from the anode 12 to the cathode 14.
Referring to fig. 3, the organic light emitting device 131 includes a first microcavity 21 and a second microcavity 22 adjacent to the first microcavity 21, the light emitting colors of the first microcavity 21 and the second microcavity 22 are the same, that is, the same organic light emitting device 131 has two microcavities, and after light with a specific wavelength in the first microcavity 21 enters the second microcavity 22 under a large viewing angle, the second microcavity 22 destroys the microcavity effect of the light with the specific wavelength, that is, destroys the wide-angle interference phenomenon of the light with the specific wavelength, thereby improving the viewing angle characteristic of the light, improving the viewing angle color shift, and particularly significantly improving the color shift under the large viewing angle. Similarly, for the light with a specific wavelength in the second microcavity 22, at a large viewing angle, after entering the first microcavity 21, the wide-angle interference phenomenon is also destroyed, so that the viewing angle color shift at the large viewing angle is improved.
The thickness x of the hole transport layer 132 in the first microcavity 21 is greater than the thickness y of the hole transport layer 132 in the second microcavity 22, and the thickness i of the electron transport layer 134 in the first microcavity 21 is less than the thickness h of the electron transport layer 134 in the second microcavity 22. The thickness direction in this embodiment can be understood as a first direction shown in fig. 4, i.e., a direction from the anode 12 to the cathode 14.
It should be noted that, as shown in fig. 3, the overall thickness of the first microcavity 21 in the first direction is greater than the overall thickness of the second microcavity 22 in the first direction; as shown in fig. 4, which is another schematic structural diagram of the organic light emitting display panel according to the embodiment of the present invention, an overall thickness of the first microcavity 21 in the first direction may be equal to an overall thickness of the second microcavity 22 in the first direction; as shown in fig. 5, which is another schematic structural diagram of the organic light-emitting display panel provided in the embodiment of the present invention, the overall thickness of the first microcavity 21 in the first direction is smaller than the overall thickness of the second microcavity 22 in the first direction, and the thickness of the first microcavity 21 and the second microcavity 22 in the first direction is not particularly limited as long as it satisfies that the thickness of the hole transport layer 132 in the first microcavity 21 is greater than the thickness of the hole transport layer 132 in the second microcavity 22, and the thickness of the electron transport layer 134 in the first microcavity 21 is smaller than the thickness of the electron transport layer 134 in the second microcavity 22, so that the distance from the light-emitting layer of the first microcavity 21 to the cathode is different from the distance from the light-emitting layer of the second microcavity 22 to the cathode, that is, the position of the light-emitting layer of the first microcavity 21 and the position of the light-emitting layer of the second microcavity 22 are not on the same horizontal plane, so that the positions of the light-emitting layers (light-emitting after recombination of electrons and holes) are different, and then two microcavities with different optical paths are obtained, it can be understood that the optical path of the microcavity of the first microcavity 21 is L1, and the optical path of the microcavity of the second microcavity 22 is L2, so that for light with a specific wavelength, the optical paths are different, and the corresponding interference intensities are different, and after the light ray under any one of the microcavities enters the other microcavity, the wide-angle interference is destroyed due to the different interference intensities of the light, and further the wide-angle color cast is improved.
In order to clearly understand the present embodiment, the following briefly describes the light emitting principle of the organic light emitting display panel of the present embodiment:
as shown in fig. 6, which is a schematic diagram of the principle of the organic light emitting display panel according to the embodiment of the present invention, for any one of the organic light emitting devices 131, a positive voltage is applied to the anode 12, a negative voltage is applied to the cathode 14, holes generated by the anode 12 are injected into the corresponding organic layer 13, electrons generated by the cathode 14 are injected into the corresponding organic layer 13, the electrons and the holes are recombined to generate excitons, and the excitons are radiatively transitioned to make the organic light emitting display panel emit light.
Based on the organic light-emitting device with the same light-emitting color, the cavity length of the first microcavity and the cavity length of the second microcavity have the following three relations:
first, in a specific embodiment, the cavity length of the first microcavity is less than the cavity length of the second microcavity. The cavity length in this embodiment is understood to be the thickness of the microcavity. As shown in fig. 5, under otherwise identical conditions, the cavity length of the first microcavity 21 is smaller than the cavity length of the second microcavity 22, i.e., the thickness of the first microcavity 21 in the first direction is smaller than the thickness of the second microcavity 22 in the first direction. Based on the orientation shown in fig. 5, the light-emitting layer of the first microcavity 21 is closer to the cathode 14 than the light-emitting layer of the second microcavity 22, that is, the light-emitting centers of the two are different, and the distance from the light-emitting center to the light-emitting layer is understood as the optical path, that is, the optical path L1 of the first microcavity 21 is different from the optical path L2 of the second microcavity 22, and the interference intensities of the two are different for the light with the same specific wavelength, especially, when the light with the specific wavelength enters the second microcavity 22 from the first microcavity 21 under a large viewing angle, the second microcavity 22 destroys the original wide-angle interference, and the emitted light can be emitted along the path, so that the color cast phenomenon at the viewing angle is improved. Similarly, after the light in the second microcavity 22 enters the first microcavity 21, the wide-angle interference thereof is also destroyed, and the color shift phenomenon at the viewing angle is also improved.
Second, in another specific embodiment, as shown in FIG. 3, the cavity length of the first microcavity 21 is greater than the cavity length of the second microcavity 22.
Third, in another specific embodiment, as shown in FIG. 4, the cavity length of the first microcavity 21 is equal to the cavity length of the second microcavity 22.
In the three cases, no matter how the cavity length of the first microcavity and the cavity length of the second microcavity are related, the position of the luminescent layer in the first microcavity is different from the position of the luminescent layer in the second microcavity, so that the luminescent centers of the first microcavity and the luminescent layer in the second microcavity are different, the optical lengths of the first microcavity and the luminescent layer are different, the wide-angle interference intensity of the first microcavity and the luminescent layer is different, and when light in any microcavity enters another microcavity, the wide-angle interference is destroyed, so that the color cast at the viewing angle is improved, and the display quality is improved.
Further, since two specific micro-cavities of the same organic light emitting device may have a cavity length difference between the second micro-cavity and the second micro-cavity, in order to not display quality, for example, a difference between the cavity length of the first micro-cavity 21 and the cavity length of the second micro-cavity 22 is a, where a is greater than or equal to 5nm and less than or equal to 15 nm. The cavity length of the microcavity is positively correlated with the working strengthening wavelength, so that the difference value between the resonance strengthening wavelength lambda 1 corresponding to the first microcavity and the resonance strengthening wavelength lambda 2 corresponding to the second microcavity is also 5-15 nm, the chromatic aberration fluctuation range is small, the wide-angle color cast can be improved, and the normal display is not influenced.
In one embodiment, as shown in fig. 4, first microcavity 21 includes a first light-emitting layer 1331, second microcavity 22 includes a second light-emitting layer 1332, and first light-emitting layer 1331 is a greater distance u from anode 12 than second light-emitting layer 1332 is a distance v from anode 12. The distances from the first light emitting layer 1331 and the second light emitting layer 1332 to the anode are different, which means that the distances from the first light emitting layer 1331 to the cathode 14 are different from the distances from the second light emitting layer 1332 to the cathode 14, that is, the optical lengths of the micro-cavities in which the two light emitting layers are located are different, namely, the optical length L1 of the first micro-cavity and the optical length L2 of the second micro-cavity. For specific light rays, the optical paths are different, the interference intensities are different, when light in any microcavity enters another microcavity, the wide-angle interference is destroyed due to the difference of the interference intensities of the two microcavities, and therefore the color cast at the visual angle can be improved.
In one embodiment, referring to fig. 5, in the direction from the first microcavity 21 to the second microcavity 22, the width z of the first microcavity 21 is equal to the width k of the second microcavity 22 in the second direction shown in fig. 5. That is, for each organic light emitting device, the two micro-cavities included therein have the same width in the second direction, so that the area occupied by the organic light emitting device 131 by the first micro-cavity 21 is the same as the area occupied by the organic light emitting device 131 by the second micro-cavity 22, and since the interference intensities of the two micro-cavities are different, the interference at a large viewing angle can be destroyed, the color shift at the large viewing angle is improved, and the display quality is improved.
Alternatively, as shown in fig. 7, which is another schematic structural diagram of the organic light emitting display panel provided in the embodiment of the present invention, in a direction from the first microcavity 21 to the second microcavity 22, that is, in a second direction shown in fig. 7, a width z of the first microcavity 21 is greater than a width k of the second microcavity 22. In the present embodiment, in the second direction, since the width of the first microcavity 21 is greater than the width of the second microcavity 22, the area of the organic light emitting device 131 occupied by the first microcavity 21 is greater than the area of the organic light emitting device 131 occupied by the second microcavity 22, and for example, the first microcavity 21 may occupy 60% to 80% of the total area of the organic light emitting device 131, so as to ensure the light emitting efficiency at the positive viewing angle.
Alternatively, as shown in fig. 8, which is another schematic structural diagram of the organic light emitting display panel provided in the embodiment of the present invention, in a direction from the first microcavity 21 to the second microcavity 22, that is, in a second direction shown in fig. 8, a width z of the first microcavity 21 is smaller than a width k of the second microcavity 22. Along the second direction, since the width of the first microcavity 21 is smaller than the width of the second microcavity 22, the area of the organic light emitting device 131 occupied by the first microcavity 21 is smaller than the area of the organic light emitting device 131 occupied by the second microcavity 22, for example, the second microcavity 22 may occupy 60% to 80% of the total area of the organic light emitting device 131, and at this time, the second microcavity 22 is used as a main microcavity, so as to ensure the light emitting efficiency at the positive viewing angle.
In one embodiment, as shown in fig. 9, which is another schematic structural diagram of an organic light emitting display panel provided in an embodiment of the present invention, the organic light emitting display panel 1 includes a second microcavity 22 and two first microcavities 21, wherein the second microcavity 22 is disposed in a central region of the organic light emitting device 131, and the two first microcavities 21 are disposed on opposite sides of the second microcavity 22 and located in a peripheral region of the organic light emitting device. The orthographic projection of the first microcavity arranged in the peripheral region on the plane of the anode 12 does not overlap with the orthographic projection of the second microcavity 22 arranged in the central region on the plane of the anode 12. For the same organic light-emitting device, the organic light-emitting device has three microcavities, and the optical length L2 of the second microcavity in the central region is different from the optical length L1 of the first microcavity in the peripheral region, so that when the light in the second microcavity in the central region is emitted clockwise or counterclockwise under a large viewing angle, the wide-angle interference is destroyed, and the problem of color cast of the light emitted in the central region under the large viewing angle can be improved.
It should be noted that the cavity length of the second microcavity 22 shown in fig. 9 is smaller than the cavity length of the first microcavity 21, and the cavity length of the second microcavity 22 in this embodiment may also be greater than or equal to the cavity length of the first microcavity 21, which is not particularly limited in this embodiment.
As shown in fig. 10, the first microcavity may be disposed in the central region, and the second microcavity may be disposed in the peripheral region. The advantageous effects of this embodiment are similar to those of the embodiment shown in fig. 7, and are not described herein again.
In one embodiment, as shown in fig. 11, the first microcavity 21 includes a first hole transport layer 1321 and a second hole transport layer 1322, and the second microcavity 22 also includes the first hole transport layer 1321 therein; the second microcavity 22 includes a first electron transport layer 1341 and a second electron transport layer 1342, and the first microcavity 21 also includes the first electron transport layer 1341. The first microcavity and the second microcavity have different cavity lengths by including different film layers, and meanwhile, the optical path L1 of the first microcavity and the optical path L2 of the second microcavity are also different, so that the interference intensity of the first microcavity and the second microcavity is different, wide-angle interference is destroyed under a large visual angle, and color cast under the large visual angle is improved.
In addition, the second microcavity 22 located in the central region can be used as a main microcavity, accounting for 60% -80% of the whole organic light-emitting device, and the light-emitting efficiency under the front view angle is high.
In this embodiment, as shown in fig. 12, which is another schematic structural diagram of the organic light emitting display panel provided in the embodiment of the present invention, the first micro-cavity may also be disposed in the central region, and the second micro-cavity is disposed in the peripheral region.
In a further embodiment, the thickness of the second hole transport layer 1322 is d, and the thickness of the second electron transport layer 1342 is f, where | f-d | > is greater than or equal to 50, and the thickness difference between the second hole transport layer and the second electron transport layer is small, so as to ensure that the difference between the optical paths corresponding to the two micro-cavities is small, and further ensure that the difference between the resonance enhancement wavelengths corresponding to the two micro-cavities is small, and ensure that the light-emitting chromatic aberration of the same color is small.
It is worth mentioning that the organic light emitting devices 131 in this embodiment have the same light emitting color, the light emitting color of the organic light emitting device may be red, green or blue, and for the organic light emitting display panel, the organic light emitting display panel includes a plurality of organic light emitting devices, each of which may include a first microcavity and a second microcavity, as shown in fig. 13, which is another schematic structural diagram of the organic light emitting display panel provided in this embodiment of the present invention, wherein the organic light emitting device having the light emitting color of red R has a first microcavity and a second microcavity, the organic light emitting device having the light emitting color of red G has a first microcavity and a second microcavity, and the organic light emitting device having the light emitting color of red B has a first microcavity and a second microcavity; or wherein the organic light emitting device of at least one of the colors of extracted light comprises a first microcavity and a second microcavity; the organic light emitting device of two emission colors includes a first microcavity and a second microcavity, which is not particularly limited in this embodiment.
In a further embodiment, the material of the second hole transport layer is aromatic amine, and the chemical structural formula is as follows:
the material of the second electron transport layer is a mixture of 8-hydroxyquinoline lithium and a benzimidazole-containing compound, and the chemical structural formula of the second electron transport layer is as follows:
in this embodiment, an organic light emitting display device is provided, as shown in fig. 14, which is a schematic structural diagram of the organic light emitting display device provided in the embodiment of the present invention, and the organic light emitting display device 500 includes the organic light emitting display panel 1 according to this embodiment.
In this embodiment, the organic light emitting display device 500 includes the organic light emitting display panel 1, therefore, the thickness of the hole transport layer in the first microcavity is greater than that of the hole transport layer in the second microcavity, and the thickness of the electron transport layer in the first microcavity is less than that of the electron transport layer in the second microcavity, that is, along the direction from the anode to the cathode, for an organic light emitting device with the same light emitting color, the organic light emitting device has two microcavities, and the microcavity has different optical lengths due to different light emitting layers (light emitting positions), so that light in any microcavity enters another microcavity at a large viewing angle, and then its wide-angle interference is destroyed, so that the light can be transmitted out along the direction, thereby improving the viewing angle color shift, especially the viewing angle color shift at the large viewing angle.
It should be noted that although fig. 14 illustrates a mobile phone, the organic light emitting display device is not limited to the mobile phone, and specifically, the organic light emitting display device may include, but is not limited to, any electronic device having a display function, such as a Personal Computer (PC), a Personal Digital Assistant (PDA), a wireless handheld device, a Tablet Computer (Tablet Computer), an MP4 player, or a television.
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; and 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.
Claims (10)
1. An organic light emitting display panel, comprising:
an organic light emitting device comprising a cathode and an anode, and an organic layer located between the cathode and the anode, the cathode, the anode, and the organic layer forming a microcavity;
the organic layer comprises a hole transport layer, a light emitting layer and an electron transport layer, and the hole transport layer, the light emitting layer and the electron transport layer are sequentially arranged in the direction of the anode facing the cathode;
the same organic light-emitting device comprises three microcavities; one microcavity is a main microcavity and is positioned in the central area; the other two micro-cavities are arranged in the peripheral area; the main microcavity accounts for 60% -80% of the whole organic light-emitting device;
the same organic light-emitting device comprises a first microcavity and a second microcavity adjacent to the first microcavity, and the light-emitting colors of the first microcavity and the second microcavity are the same;
the thickness of the hole transport layer in the first microcavity is greater than that of the hole transport layer in the second microcavity, and the thickness of the electron transport layer in the first microcavity is less than that of the electron transport layer in the second microcavity;
the first microcavity comprises a first hole transport layer and a second hole transport layer, and the second microcavity also comprises the first hole transport layer;
the second microcavity comprises a first electron transport layer and a second electron transport layer, and the first microcavity also comprises a first electron transport layer;
the thickness of the second hole transport layer is d, and the thickness of the second hole transport layer and the thickness of the second electron transport layer are f, wherein | f-d | is more than or equal to 50;
when the viewing angle is increased to a certain degree, light emitted by the light emitting layer in the first microcavity enters the second microcavity, and light emitted by the light emitting layer in the second microcavity enters the first microcavity.
2. The organic light-emitting display panel of claim 1, wherein the first microcavity has a cavity length that is less than a cavity length of the second microcavity.
3. The organic light-emitting display panel according to claim 1,
the cavity length of the first microcavity is greater than or equal to the cavity length of the second microcavity.
4. The organic light-emitting display panel according to claim 2, wherein the organic light-emitting display panel comprises one of the second micro-cavities and two of the first micro-cavities;
the second micro-cavity is arranged in the central area of the organic light-emitting device and is the main micro-cavity, and the two first micro-cavities are arranged on two opposite sides of the second micro-cavity and are located in the peripheral area of the organic light-emitting device.
5. The display panel according to claim 1,
the first microcavity comprises a first light-emitting layer, the second microcavity comprises a second light-emitting layer, and the distance from the first light-emitting layer to the anode is larger than the distance from the second light-emitting layer to the anode.
6. The organic light-emitting display panel according to claim 1,
in a direction from the first microcavity to the second microcavity, a width of the first microcavity is equal to a width of the second microcavity.
7. The organic light-emitting display panel according to claim 1,
in the direction from the first microcavity to the second microcavity, the width of the first microcavity is greater than or less than the width of the second microcavity.
8. The organic light-emitting display panel according to claim 1,
the material of the second hole transport layer is aromatic amine;
the material of the second electron transport layer is a mixture of 8-hydroxyquinoline lithium and a benzimidazole-containing compound.
9. The organic light-emitting display panel according to claim 1,
the difference value between the cavity length of the first micro-cavity and the cavity length of the second micro-cavity is a, wherein a is more than or equal to 5nm and less than or equal to 15 nm.
10. An organic light-emitting display device comprising the organic light-emitting display panel according to any one of claims 1 to 9.
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| CN112103324B (en) * | 2020-09-23 | 2023-05-26 | 京东方科技集团股份有限公司 | Display device and display panel thereof |
| CN113594386B (en) * | 2021-07-28 | 2022-09-23 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN113629114B (en) * | 2021-07-30 | 2023-02-03 | 深圳市华星光电半导体显示技术有限公司 | Display panel |
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| CN101673809A (en) * | 2009-06-24 | 2010-03-17 | 友达光电股份有限公司 | An organic light-emitting device and an organic luminous display unit panel |
| CN106816453A (en) * | 2015-11-03 | 2017-06-09 | 乐金显示有限公司 | Organic Light Emitting Diode Display Device |
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| US10243023B2 (en) * | 2013-01-18 | 2019-03-26 | Universal Display Corporation | Top emission AMOLED displays using two emissive layers |
| CN106129265B (en) * | 2016-09-09 | 2018-04-17 | 京东方科技集团股份有限公司 | Organic electroluminescence device |
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| CN101673809A (en) * | 2009-06-24 | 2010-03-17 | 友达光电股份有限公司 | An organic light-emitting device and an organic luminous display unit panel |
| CN106816453A (en) * | 2015-11-03 | 2017-06-09 | 乐金显示有限公司 | Organic Light Emitting Diode Display Device |
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Effective date of registration: 20211025 Address after: No.8, liufangyuan Henglu, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN TIANMA MICROELECTRONICS Co.,Ltd. Patentee after: Wuhan Tianma Microelectronics Co.,Ltd. Shanghai Branch Address before: Room 509, building 1, No. 6111, Longdong Avenue, Pudong New Area, Shanghai, 201201 Patentee before: SHANGHAI TIANMA AM-OLED Co.,Ltd. |