CN109285953B - Organic light-emitting display panel and electronic equipment - Google Patents
Organic light-emitting display panel and electronic equipment Download PDFInfo
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- CN109285953B CN109285953B CN201710599034.0A CN201710599034A CN109285953B CN 109285953 B CN109285953 B CN 109285953B CN 201710599034 A CN201710599034 A CN 201710599034A CN 109285953 B CN109285953 B CN 109285953B
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/12—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising dopants
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- 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 embodiment of the invention discloses an organic light-emitting display panel and electronic equipment, wherein the organic light-emitting display panel comprises: the first electrode layer comprises a plurality of first electrodes which are arranged in an array; the light-emitting functional layer is positioned between the first electrode layer and the second electrode layer and comprises a plurality of organic light-emitting film blocks, the organic light-emitting film blocks are respectively arranged corresponding to the first electrodes, the organic light-emitting film blocks at least comprise red organic light-emitting film blocks, green organic light-emitting film blocks and blue organic light-emitting film blocks, the red organic light-emitting film blocks comprise red light host materials, first guest materials and second guest materials, the intrinsic spectrum peak wavelength of the first guest materials is larger than or equal to 610nm, and the intrinsic spectrum peak wavelength of the second guest materials is smaller than 610 nm. In the embodiment of the invention, the phenomenon of red bias or green bias shown after the OLED display panel changes the visual angle is weakened, and the phenomenon of color bias is improved.
Description
Technical Field
Embodiments of the present invention relate to display technologies, and in particular, to an organic light emitting display panel and an electronic device.
Background
An Organic Light-Emitting Diode (OLED) display panel is a self-luminous display device using an Organic thin film as a Light-Emitting body, and has the advantages of being ultra-thin, high in brightness, high in Light-Emitting efficiency, good in shock resistance and the like.
RGB is a color standard, and various colors can be obtained by changing and superimposing R, G, B three colors, so that the sub-pixels of the conventional OLED display panel generally include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, and the OLED display panel can generate tens of millions of colors by controlling whether each R, G, B sub-pixel emits light and the light-emitting brightness, respectively, thereby implementing image display. With the commercial application and development of displays, the requirements of commercial products on the display effect of the OLED display panel are higher and higher.
However, in the conventional OLED display panel, since the three primary colors R, G, B are not uniform in their steps with the attenuation of the viewing angle, the OLED display panel usually shows "red shift" or "green shift" after the viewing angle is changed, i.e. a user may find that there is a color difference, i.e. a color shift phenomenon, when viewing the OLED display.
Disclosure of Invention
Embodiments of the present invention provide an organic light emitting display panel and an electronic device to improve color shift.
In a first aspect, an embodiment of the present invention provides an organic light emitting display panel, including:
the electrode structure comprises a first electrode layer and a second electrode layer which are oppositely arranged, wherein the first electrode layer comprises a plurality of first electrodes which are arranged in an array;
the light-emitting functional layer is positioned between the first electrode layer and the second electrode layer and comprises a plurality of organic light-emitting film blocks, the organic light-emitting film blocks are respectively and correspondingly arranged with the first electrodes, the organic light-emitting film blocks at least comprise red organic light-emitting film blocks, green organic light-emitting film blocks and blue organic light-emitting film blocks, the red organic light-emitting film blocks comprise red light host materials, first guest materials and second guest materials, the intrinsic spectral peak wavelength of the first guest materials is larger than or equal to 610nm, and the intrinsic spectral peak wavelength of the second guest materials is smaller than 610 nm.
Further, a difference in intrinsic spectral peak wavelengths of the first guest material and the second guest material is greater than or equal to 10nm and less than or equal to 30 nm.
Further, the intrinsic spectral peak wavelength of the first guest material is 615nm, and the intrinsic spectral peak wavelength of the second guest material is 590 nm.
Further, a spectral half-bandwidth of a first organic light emitting display panel including a composite material of the first guest material and the second guest material is larger than a spectral half-bandwidth of a second organic light emitting display panel including the first guest material.
Further, when the light emitting mode of the organic light emitting display panel is bottom emission, the intrinsic half-wavelength width of the first bottom emission organic light emitting display panel including the composite material of the first guest material and the second guest material is greater than 40nm, and the intrinsic half-wavelength width of the second bottom emission organic light emitting display panel including the first guest material is less than 40 nm.
Further, when the light emitting mode of the organic light emitting display panel is top emission, a spectral half-wave width of a first top emission organic light emitting display panel including a composite material of the first guest material and the second guest material is greater than 38nm, and a spectral half-wave width of a second top emission organic light emitting display panel including the first guest material is less than 38 nm.
Further, in the organic light emitting display panel, the luminance decay of the red organic light emitting film block at a 30 ° viewing angle is a first luminance percentage of the luminance decay of the red organic light emitting film block at a 0 ° viewing angle, and the luminance decay of the green organic light emitting film block at a 30 ° viewing angle is a second luminance percentage of the luminance decay of the green organic light emitting film block at a 0 ° viewing angle, wherein an absolute value of a difference between the first luminance percentage and the second luminance percentage is greater than or equal to 0% and less than or equal to 5%.
Further, the first guest material and the second guest material are both phosphorescent materials.
Further, the organic light emitting display panel further includes: the first substrate is positioned on one side, away from the light-emitting functional layer, of the first electrode layer, and the first substrate is a rigid substrate or a flexible substrate.
In a second aspect, embodiments of the present invention also provide an electronic device, which includes the organic light emitting display panel described above.
In the embodiment of the invention, two guest materials with different intrinsic spectral peak wavelengths are doped in a red organic light-emitting film block of the organic light-emitting display panel, wherein the intrinsic spectral peak wavelength of a first guest material is larger than or equal to 610nm, and the intrinsic spectral peak wavelength of a second guest material is smaller than 610nm, so that the red light spectrum of the doped red organic light-emitting film block is wider than the spectrum of a single doped red organic light-emitting device, the rate of red light emitted by the red organic light-emitting film block attenuating along with the visual angle is slowed, and the difference of the attenuation rates of the red organic light-emitting film block and a green organic light-emitting film block is reduced, thereby reducing the phenomenon of red bias or green bias shown after the OLED display panel changes the visual angle, and improving the color bias phenomenon of the OLED display panel.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an organic light emitting display provided by an embodiment of the present invention;
fig. 2 is a schematic view of an organic light emitting display panel according to an embodiment of the present invention;
fig. 3A is an intrinsic spectrum diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 3B is a spectrum diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 4A is a graph illustrating a decay curve of a red organic light emitting film block of an organic light emitting display panel according to an embodiment of the present invention;
fig. 4B is a graph showing the attenuation comparison of red organic light emitting film blocks and green organic light emitting film blocks of the organic light emitting display panel according to the embodiment of the present invention;
fig. 5 is a schematic diagram of an electronic device provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying 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.
Referring to fig. 1, a schematic diagram of an organic light emitting display according to an embodiment of the present invention is shown. The organic light emitting display includes a lower substrate 100 and an upper substrate (or a packaging Thin film layer) 200, a Thin Film Transistor (TFT) array located on the lower substrate 100, a first electrode layer 110, a light emitting functional layer 120 and a second electrode layer 130, where the first electrode layer 110 includes a plurality of first electrodes 111 arranged in an array, the light emitting functional layer 120 includes a plurality of organic light emitting modules arranged corresponding to the plurality of first electrodes 111, and the plurality of organic light emitting modules at least include a red organic light emitting module 121, a green organic light emitting module 122 and a blue organic light emitting module 123.
The light emitting mechanism of the organic light emitting display is, for example, red light: applying a positive voltage to the first electrode 111 corresponding to the red organic light emitting film block 121 and applying a negative voltage to the second electrode layer 130; holes generated by the first electrode 111 corresponding to the red organic light emitting film block 121 are injected into the red organic light emitting film block 121, and electrons generated by the second electrode layer 130 are injected into the light emitting function layer 120; the electrons and holes injected into the red organic light emitting film block 121 are combined and release energy, the organic light emitting molecules in the red organic light emitting film block 121 obtain the energy and are excited to transit from a ground state to an excited state, the organic light emitting molecules in the excited state return to the ground state and release energy, and then the red organic light emitting film block 121 performs electroluminescence.
In order to clearly describe the technical solution of the present invention, only a partial structure of the organic light emitting display is taken as an example for description and illustration in the following embodiments.
Referring to fig. 2, an organic light emitting display panel according to an embodiment of the present invention includes: the first electrode layer 110 and the second electrode layer 130 are oppositely arranged, and the first electrode layer 110 comprises a plurality of first electrodes 111 arranged in an array; the light-emitting functional layer 120 is located between the first electrode layer 110 and the second electrode layer 130, the light-emitting functional layer 120 includes a plurality of organic light-emitting film blocks, the plurality of organic light-emitting film blocks are respectively arranged corresponding to the plurality of first electrodes 111, the plurality of organic light-emitting film blocks at least include a red organic light-emitting film block 121, a green organic light-emitting film block 122 and a blue organic light-emitting film block 123, the red organic light-emitting film block 121 includes a red light host material, a first guest material and a second guest material, an intrinsic spectral peak wavelength of the first guest material is greater than or equal to 610nm, and an intrinsic spectral peak wavelength of the second guest material is less than 610 nm.
In the embodiment of the present invention, the organic light emitting display panel includes a red pixel region R, a green pixel region G, and a blue pixel region B, specifically, a region corresponding to the red organic light emitting film block 121 emits red light, which is the red pixel region R, a region corresponding to the green organic light emitting film block 122 emits green light, which is the green pixel region G, and a region corresponding to the blue organic light emitting film block 123 emits blue light, which is the blue pixel region B. It will be understood by those skilled in the art that the organic light emitting display panel may also optionally include other color pixel regions, such as a yellow pixel region and a white pixel region, and the color, the number and the color arrangement of the pixel regions of the organic light emitting display panel are not specifically limited in the present invention, and any organic light emitting display panel having a red pixel region in the present invention falls within the protection scope of the present invention. Only one red pixel region R in the organic light emitting display panel is described as an example.
In the embodiment of the present invention, the red organic light emitting film block 121 of the organic light emitting display panel includes a red light host material, a first guest material, and a second guest material. The red light main body material is any one of the existing known red light main body materials, and is not specifically limited in the invention; for example, the red host material may be selected from carbazole-containing compounds, and the carbazole-containing compounds may be used as the host material, which has the advantage of having sufficiently large triplet energy and carrier transport properties, but the specific chemical formula of the carbazole-containing compounds is not particularly limited in the present invention. Optionally, the first guest material and the second guest material are both phosphorescent materials, and the phosphorescent materials have the advantages of high light emitting efficiency and a service life capable of meeting commercial requirements, but the invention does not limit that the first guest material and the second guest material are only phosphorescent materials and do not limit specific chemical formulas of the first guest material and the second guest material, and any one of the existing red guest materials falls within the protection scope of the invention.
In the embodiment of the invention, the intrinsic spectrum peak wavelength of the first guest material is greater than or equal to 610nm, and the intrinsic spectrum peak wavelength of the second guest material is less than 610 nm. The intrinsic spectrum peak wavelength of red light is about 625nm, the intrinsic spectrum peak wavelength of orange light is about 610nm, the intrinsic spectrum peak wavelength of yellow light is about 590nm, and obviously, the light with the intrinsic spectrum peak wavelength less than 610nm has yellow color and the light with the intrinsic spectrum peak wavelength more than 610nm has red color. In the embodiment of the present invention, the intrinsic spectrum peak wavelength of the second guest material is less than 610nm, that is, the intrinsic spectrum peak wavelength of the first guest material is greater than 610nm, that is, the intrinsic spectrum peak wavelength of the second guest material is more than red, and the intrinsic spectrum peak wavelengths of the first guest material and the second guest material are different, when the second guest material and the first guest material, which have the difference in both intrinsic spectrum peak wavelength and light color, are doped into the red host material, the red spectrum of the red organic light emitting film block 121 is wider than the spectrum of a single doped red organic light emitting device, and thus the rate of red light emitted by the red organic light emitting film block 121 decaying with the viewing angle is slowed down.
In the embodiment of the invention, two guest materials with different intrinsic spectral peak wavelengths are doped in a red organic light-emitting film block of the organic light-emitting display panel, wherein the intrinsic spectral peak wavelength of a first guest material is larger than or equal to 610nm, and the intrinsic spectral peak wavelength of a second guest material is smaller than 610nm, so that the red light spectrum of the doped red organic light-emitting film block is wider than the spectrum of a single doped red organic light-emitting device, the rate of red light emitted by the red organic light-emitting film block attenuating along with the visual angle is slowed, and the difference of the attenuation rates of the red organic light-emitting film block and a green organic light-emitting film block is reduced, thereby reducing the phenomenon of red bias or green bias shown after the OLED display panel changes the visual angle, and improving the color bias phenomenon of the OLED display panel.
Optionally, referring to fig. 2, an organic light emitting display panel provided in an embodiment of the present invention further includes: the first substrate 140 is located on a side of the first electrode layer 110 away from the light-emitting functional layer 120, and the first substrate 110 is a rigid substrate or a flexible substrate. In the embodiment of the present invention, the first substrate 140 of the selectable organic light emitting display panel is a flexible substrate, the corresponding organic light emitting display panel is a flexible organic light emitting display panel, the flexible organic light emitting display panel has a bendable characteristic, and can be extended to a planar state and also can be bent to a bent state, and the flexible organic light emitting display panel is suitable for being applied to various electronic devices, and is particularly suitable for wearable electronic devices. In the embodiment of the present invention, the material of the flexible substrate may be polyimide or polyethylene terephthalate resin, and those skilled in the art will understand that the material of the flexible substrate includes, but is not limited to, the above materials, and any material that can be used as the flexible substrate falls within the scope of the present invention.
Those skilled in the art can also understand that the first substrate includes but is not limited to a flexible substrate, and in other embodiments, the first substrate may be a rigid substrate, and accordingly, a rigid organic light emitting display panel is provided. The related practitioner can reasonably select the material of the first substrate according to the requirement of the product.
Alternatively, referring to fig. 2, in the organic light emitting display panel provided in the embodiment of the invention, a composition material of the first electrode layer 110 includes indium tin oxide ITO or indium zinc oxide IZO, and a composition material of the second electrode layer 130 includes a metal material or a metal alloy material. The first electrode layer 110 includes a silver metal layer, ITO or IZO, and a silver metal layer stacked in sequence, that is, the first electrode layer 110 is a total reflection anode; the metal film layer or the metal alloy film layer of the second electrode layer 130 has a very thin thickness, and thus can exhibit a transparent property to allow light to pass therethrough.
It will be understood by those skilled in the art that there are many constituent materials for the first electrode layer and the second electrode layer, including but not limited to the above examples, and the relevant practitioner can select the constituent materials for forming the first electrode layer and the second electrode layer according to the product requirement, and the invention is not limited in particular; on the other hand, in the actual production process, the relevant practitioner can reasonably set the polarities of the first electrode and the second electrode according to the product and design requirements, and the invention is not particularly limited.
In the embodiment of the invention, the organic light emitting display panel can be selected as a top light emitting organic light emitting display panel, and can also be selected as a bottom light emitting organic light emitting display panel. However, the light emitting mode of the organic light emitting display panel is not particularly limited in the present invention, and any organic light emitting display panel having any light emitting mode may fall within the scope of the present invention.
Optionally, in the organic light emitting display panel provided in the embodiment of the present invention, a difference between intrinsic spectral peak wavelengths of the first guest material and the second guest material is greater than or equal to 10nm and less than or equal to 30 nm. When the difference between the intrinsic peak wavelengths of the first guest material and the second guest material is small, for example, less than 10nm, the red light spectrum of the red organic light emitting film block 121 is similar to the spectral width of the singly doped red organic light emitting device, and the rate of the red light emitted from the corresponding red organic light emitting film block 121 decaying with the viewing angle is similar to that of the prior art, so that the effect of improving the color cast phenomenon is very weak. When the difference between the intrinsic peak wavelengths of the first guest material and the second guest material is larger than 30nm, the difference between the colors of the light emitted by the first guest material and the light emitted by the second guest material is larger, which easily causes the color of the light emitted by the red organic light emitting film block 121 to change, so that the color purity of the red organic light emitting module 121 is poor, and the display effect of the organic light emitting display device is affected. Therefore, in the embodiment of the present invention, the difference between the intrinsic peak wavelengths of the first guest material and the second guest material is greater than or equal to 10nm and less than or equal to 30nm, which not only can effectively improve the color shift, but also can ensure the color purity of the red light emitted from the red organic light emitting film block 121.
Optionally, in the organic light emitting display panel provided in the embodiment of the present invention, an intrinsic spectrum peak wavelength of the first guest material is 615nm, and an intrinsic spectrum peak wavelength of the second guest material is 590 nm. The intrinsic spectral peak wavelengths of the first guest material and the second guest material are different, and the difference of light colors is small, so that the color cast can be effectively improved, and the color purity of red light emitted by the red organic light-emitting film block can be ensured. It will be understood by those skilled in the art that the intrinsic spectral peak wavelengths of the first guest material and the second guest material include, but are not limited to, the above examples, and the first guest material and the second guest material can be selected reasonably by the relevant practitioner according to the production needs.
Optionally, in the organic light emitting display panel provided in the embodiment of the present invention, a half bandwidth of a spectrum of a first organic light emitting display panel including a composite material of a first guest material and a second guest material is greater than a half bandwidth of a spectrum of a second organic light emitting display panel including the first guest material. In the embodiment of the invention, the intrinsic spectrum peak wavelength of the selected first guest material is larger than or equal to 610nm, the intrinsic spectrum peak wavelength of the selected second guest material is smaller than 610nm, and the spectrum half-wave width of the first organic light-emitting display panel of the composite material containing the first guest material and the second guest material is obtained by measuring the spectrum and is larger than the spectrum half-wave width of the second organic light-emitting display panel containing the first guest material. The second organic light emitting display panel does not include a second guest material therein.
Optionally, when the light emitting mode of the organic light emitting display panel is bottom light emitting, the intrinsic half-wavelength bandwidth of the first bottom light emitting organic light emitting display panel of the composite material including the first guest material and the second guest material is greater than 40nm, and the intrinsic half-wavelength bandwidth of the second bottom light emitting organic light emitting display panel including the first guest material is less than 40 nm. After guest materials with different peak wavelengths are doped into the host material, the intrinsic spectrum half-wave width of the formed bottom-emitting organic light-emitting display panel can be effectively widened. Optionally, when the light emitting mode of the organic light emitting display panel is top light emitting, a spectral half-wave width of a first top light emitting organic light emitting display panel of a composite material including the first guest material and the second guest material is greater than 38nm, and a spectral half-wave width of a second top light emitting organic light emitting display panel including the first guest material is less than 38 nm. The second bottom emission organic light emitting display panel does not include a second guest material. The second top emission organic light emitting display panel does not include a second guest material.
Referring to fig. 3A, an eigenspectrum diagram measured in a bottom emission organic light emitting display panel in which an eigenspectrum peak wavelength of a selected first guest material RD1 is 615nm and an eigenspectrum peak wavelength of a selected second guest material RD2 is 590nm, a half-wave width of an eigenspectrum of a bottom emission organic light emitting display panel including a composite material (RD 1: RD2) of the first guest material and the second guest material is about 42nm, and a half-wave width of an eigenspectrum of a bottom emission organic light emitting display panel including the first guest material RD1 is about 38nm, it is apparent that an eigenspectrum half-wave width of an organic light emitting display panel including a composite material of two guest materials having different peak wavelengths is larger than that of an organic light emitting display panel including one of the guest materials. Compared with the prior art, the red organic light-emitting film block provided by the embodiment of the invention has a wider red light spectrum, and can reduce the difference of the attenuation speed of the red organic light-emitting film block and the attenuation speed of the green organic light-emitting film block, so that the color cast phenomenon of the OLED display panel is improved.
Referring to fig. 3B, a spectrum diagram measured in a top emission organic light emitting display panel in which the intrinsic spectral peak wavelength of the selected first guest material RD1 was 615nm and the intrinsic spectral peak wavelength of the selected second guest material RD2 was 590nm, the half-wave width of the spectrum of the top emission organic light emitting display panel including the composite material (RD 1: RD2) of the first guest material and the second guest material was measured to be about 39nm, and the half-wave width of the spectrum of the top emission organic light emitting display panel including the first guest material RD1 was measured to be about 37nm, it was apparent that the half-wave width of the spectrum of the organic light emitting display panel including the composite material of two guest materials having different peak wavelengths was greater than the half-wave width of the spectrum of the organic light emitting display panel including one of the guest materials. Compared with the prior art, the red organic light-emitting film block provided by the embodiment of the invention has a wider red light spectrum, and can reduce the difference of the attenuation speed of the red organic light-emitting film block and the attenuation speed of the green organic light-emitting film block, so that the color cast phenomenon of the OLED display panel is improved.
As will be understood by those skilled in the art, the half-wave width of the organic light emitting display panel including the composite material of the first guest material and the second guest material is determined based on the selected materials of the first guest material and the second guest material, when the materials of the first guest material and the second guest material are changed, the intrinsic spectral peak wavelength thereof is changed and the half-wave width of the organic light emitting display panel is changed, and the relevant practitioner may reasonably select the first guest material and the second guest material according to the limitations of the intrinsic spectral peak wavelength and the half-wave width of the first guest material and the second guest material, and the first guest material and the second guest material are not specifically limited in the present invention.
Optionally, in the organic light emitting display panel provided in the embodiment of the present invention, the luminance attenuation of the red organic light emitting film block at the 30 ° viewing angle is a first luminance percentage of the luminance attenuation of the red organic light emitting film block at the 0 ° viewing angle, and the luminance attenuation of the green organic light emitting film block at the 30 ° viewing angle is a second luminance percentage of the luminance attenuation of the green organic light emitting film block at the 0 ° viewing angle, where an absolute value of a difference between the first luminance percentage and the second luminance percentage is greater than or equal to 0% and less than or equal to 5%. In the embodiment of the invention, the second guest material and the first guest material which have different intrinsic spectral peak wavelengths and light colors are doped into the red host material, so that the red light spectrum of the red organic light-emitting film block is wider than that of a single doped red organic light-emitting device, and the rate of red light emitted by the red organic light-emitting film block decaying along with the visual angle is further slowed down.
Referring to fig. 4A, an attenuation curve of a double guest-doped red organic light emitting film block is shown, in which an intrinsic spectrum peak wavelength of a first guest material RD1 doped in a red organic light emitting film block R1 is selected to be 615nm and an intrinsic spectrum peak wavelength of a second guest material RD2 is selected to be 590nm, and an intrinsic spectrum peak wavelength of a conventional red device R2 doped with a first guest material RD1 is selected to be 615 nm. The measured decay rate of the double-doped red organic light-emitting film block R1 is slower than that of the existing red device R2, specifically, the light-emitting brightness of the red organic light-emitting film block R1 at a viewing angle of 30 degrees is about 80% of that of the red organic light-emitting film block R1 at a viewing angle of 0 degrees, and the light-emitting brightness of the red device R2 at a viewing angle of 30 degrees is about 65% of that of the red device R1 at a viewing angle of 0 degrees. Compared with the prior art, the red organic light-emitting film block provided by the embodiment of the invention has the advantages that the attenuation speed is reduced, and the color cast phenomenon of the OLED display panel can be effectively improved.
Referring to fig. 4B, there is shown an attenuation comparison graph of a red organic light emitting film bulk and a green organic light emitting film bulk, in which the intrinsic spectral peak wavelength of the selected first guest material RD1 is 615nm and the intrinsic spectral peak wavelength of the selected second guest material RD2 is 590 nm. The measured attenuation rate of the double-doped red organic light-emitting film block R1 is almost equal to that of the green organic light-emitting film block G, namely the attenuation of red light and green light in the organic light-emitting display panel is almost synchronous, and the absolute value of the difference between the first brightness percentage of the specific red organic light-emitting film block at a viewing angle of 30 degrees and the second brightness percentage of the specific green organic light-emitting film block at the viewing angle of 30 degrees is more than or equal to 0% and less than or equal to 5%. Compared with the prior art, the embodiment of the invention reduces the attenuation speed difference of the red organic light-emitting film block and the green organic light-emitting film block, and can effectively improve the color cast phenomenon of the OLED display panel.
Optionally, the organic light emitting display panel provided in the embodiment of the present invention further includes: a first functional layer on a side of the first electrode layer facing the light-emitting functional layer, the first functional layer comprising at least a hole transport layer. The first electrode layer is an anode, and the first functional layer at least comprises a hole transport layer and can be used for enhancing the capability of injecting and transporting holes of the first electrode layer to the light-emitting functional layer and improving the carrier recombination efficiency in the light-emitting functional layer. It will be appreciated by those skilled in the art that in alternative embodiments, the first functional layer may further include at least one of a hole injection layer and an electron blocking layer, and thus the first functional layer not only can improve hole injection and transport capabilities, but also can minimize the energy barrier that is crossed when holes transition. It will be understood by those skilled in the art that the constituent material of the hole transport layer in the present invention includes any one of the hole transport materials known in the art, and is not particularly limited in the present invention.
Optionally, the organic light emitting display panel further includes: and the second functional layer is positioned between the light-emitting functional layer and the second electrode layer, and at least comprises an electron transport layer. The second functional layer at least comprises an electron transport layer, and the electron transport layer can be used for enhancing the capability of injecting and transporting electrons of the second electrode layer to the light-emitting functional layer and improving the carrier recombination efficiency in the light-emitting functional layer. It will be appreciated by those skilled in the art that in alternative embodiments the second functional layer may further comprise at least one of an electron injection layer and a hole blocking layer, and that the second functional layer not only enhances electron injection and transport capabilities, but also minimizes the energy level barrier spanned by the electron transition. It will be understood by those skilled in the art that the constituent material of the electron transport layer in the present invention includes any electron transport material known in the art, and is not particularly limited in the present invention.
The organic light-emitting display panel can improve the injection and input capability of electrons and holes and can reduce barrier barriers when the electrons and the holes transition. The structure and function of the first functional layer and the second functional layer may be understood by those skilled in the art and will not be described herein.
Referring to fig. 5, an electronic device provided in an embodiment of the present invention includes an organic light emitting display panel according to any of the above embodiments. In the organic light-emitting display panel, the red organic light-emitting film block is doped by adopting two guest materials, and the intrinsic spectral peak wavelengths of the two guest materials are different, so that the spectral width of the red organic light-emitting film block can be widened, the red light attenuation speed is reduced, the R and G in the organic light-emitting display panel are uniform along with the step of visual angle attenuation, and the color cast phenomenon is improved.
Compared with the prior art, the red organic light-emitting film block in the organic light-emitting display panel of the electronic device provided by the embodiment of the invention adopts double-object doping, does not change the OLED display panel greatly, and is easy to realize in the process.
It can be understood by those skilled in the art that the foregoing only shows a part or a partial structure of the organic light emitting display panel and the electronic device, and the organic light emitting display panel further includes other structures, which are not described in detail herein.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. An organic light emitting display panel, comprising:
the electrode structure comprises a first electrode layer and a second electrode layer which are oppositely arranged, wherein the first electrode layer comprises a plurality of first electrodes which are arranged in an array;
the light-emitting functional layer is located between the first electrode layer and the second electrode layer and comprises a plurality of organic light-emitting film blocks, the organic light-emitting film blocks are respectively and correspondingly arranged with the first electrodes, the organic light-emitting film blocks at least comprise red organic light-emitting film blocks, green organic light-emitting film blocks and blue organic light-emitting film blocks, the red organic light-emitting film blocks comprise red light host materials and composite materials comprising first guest materials and second guest materials, the intrinsic spectral peak wavelength of the first guest materials is larger than or equal to 610nm, the intrinsic spectral peak wavelength of the second guest materials is smaller than 610nm, and the first guest materials and the second guest materials are phosphorescent materials.
2. The organic light-emitting display panel according to claim 1, wherein a difference in intrinsic spectral peak wavelengths of the first guest material and the second guest material is greater than or equal to 10nm and less than or equal to 30 nm.
3. The organic light-emitting display panel according to claim 1, wherein the intrinsic spectral peak wavelength of the first guest material is 615nm, and the intrinsic spectral peak wavelength of the second guest material is 590 nm.
4. The organic light-emitting display panel according to claim 1, wherein a spectral half-bandwidth of a first organic light-emitting display panel including a composite material of the first guest material and the second guest material is larger than a spectral half-bandwidth of a second organic light-emitting display panel including the first guest material.
5. The organic light-emitting display panel according to claim 4, wherein when the light-emitting mode of the organic light-emitting display panel is bottom emission, a half-wavelength width of an intrinsic spectrum of a first bottom-emitting organic light-emitting display panel including the composite material of the first guest material and the second guest material is greater than 40nm, and a half-wavelength width of an intrinsic spectrum of a second bottom-emitting organic light-emitting display panel including the first guest material is less than 40 nm.
6. The organic light-emitting display panel according to claim 4, wherein when the light-emitting mode of the organic light-emitting display panel is top emission, a spectral half-width of a first top-emission organic light-emitting display panel including a composite material of the first guest material and the second guest material is greater than 38nm, and a spectral half-width of a second top-emission organic light-emitting display panel including the first guest material is less than 38 nm.
7. The panel of claim 1, wherein the luminance of the red organic light-emitting film at a viewing angle of 30 ° decays to a first luminance percentage of the luminance of the red organic light-emitting film at a viewing angle of 0 °, and the luminance of the green organic light-emitting film at a viewing angle of 30 ° decays to a second luminance percentage of the luminance of the green organic light-emitting film at a viewing angle of 0 °, and wherein an absolute value of a difference between the first luminance percentage and the second luminance percentage is greater than or equal to 0% and less than or equal to 5%.
8. The organic light-emitting display panel according to claim 1, further comprising: the first substrate is positioned on one side, away from the light-emitting functional layer, of the first electrode layer, and the first substrate is a rigid substrate or a flexible substrate.
9. An electronic device characterized by comprising the organic light-emitting display panel according to any one of claims 1 to 8.
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