CN110890478A - Organic light emitting display panel and organic light emitting display device - Google Patents
Organic light emitting display panel and organic light emitting display device Download PDFInfo
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H10K50/00—Organic light-emitting devices
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- H10K50/81—Anodes
- H10K50/814—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
- H10K50/818—Reflective anodes, e.g. ITO combined with thick metallic layers
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- H—ELECTRICITY
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- 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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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
Abstract
The embodiment of the invention provides an organic light-emitting display panel and an organic light-emitting display device, relates to the technical field of display, and effectively improves the color cast phenomenon under a large viewing angle. The organic light emitting display panel includes: a substrate base plate; a plurality of organic light emitting devices formed on the substrate, the organic light emitting devices including a composite anode, a light emitting layer and a cathode which are laminated in a light emitting direction; the composite anode comprises n anode layers and n-1 first transparent electrodes, and the anode layers and the first transparent electrodes are arranged at intervals along the light emergent direction; the n anode layers are a total reflection anode and n-1 semi-transmission semi-reflection anodes, and the semi-transmission semi-reflection anodes are positioned between the total reflection anode and the cathode; in the n anode layers, an ith micro-cavity is formed between the ith anode layer and the cathode, and the optical path of light in the ith micro-cavity is LiThe optical path of light in the (i + 1) th micro-cavity is Li+1，
Wherein λ is wavelength, i is 1 to n-1, and m is a positive integer greater than 1.
Description
[ technical field ] A method for producing a semiconductor device
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.
[ background of the invention ]
Organic Light-Emitting Diode (OLED) display panels are widely used in the display technology field due to their advantages of active Light emission, high contrast, no viewing angle limitation, and the like. In a conventional organic light emitting display panel, a microcavity is formed between an anode and a cathode of an organic light emitting device, and the microcavity is used to improve the luminance and efficiency of the organic light emitting device.
However, due to the existence of the microcavity, the optical path difference of the interference light in the microcavity is different at different viewing angles, and after the interference light in the microcavity interacts with each other, the peak wavelength corresponding to the light of the same color at a large viewing angle is shifted from the peak wavelength corresponding to the light at a normal viewing angle, for example, the peak wavelength of the spectrum corresponding to the red organic light emitting device at the normal viewing angle is 620nm, and the peak wavelength of the spectrum corresponding to the large viewing angle of 60 ° may only be 612nm, which causes a blue shift in wavelength, and further causes a deviation between the color presented at the large viewing angle and the color presented at the normal viewing angle, and a color shift phenomenon occurs. Especially in the field of vehicle-mounted vehicles, in order to ensure safe driving, it is generally required that the main driving seat and the auxiliary driving seat can clearly see the instrument panel or the central control display, so that the requirement on color cast under a large viewing angle is higher.
[ summary of the invention ]
In view of the above, embodiments of the present invention provide an organic light emitting display panel and an organic light emitting display device, which can effectively improve the color shift phenomenon at a large viewing angle.
In one aspect, an embodiment of the present invention provides an organic light emitting display panel, including:
a substrate base plate;
a plurality of organic light emitting devices formed on the substrate, the organic light emitting devices including a composite anode, a light emitting layer, and a cathode stacked in a light emitting direction;
the composite anode comprises n anode layers and n-1 first transparent electrodes, and the anode layers and the first transparent electrodes are arranged at intervals along the light emergent direction; the n anode layers are a total reflection anode and n-1 semi-transmission semi-reflection anodes, and the semi-transmission semi-reflection anodes are positioned between the total reflection anode and the cathode;
in the n anode layers, an ith micro-cavity is formed between the ith anode layer and the cathode, and the optical path of light in the ith micro-cavity is LiThe optical path of light in the (i + 1) th micro-cavity is Li+1，
Wherein λ is wavelength, i is 1 to n-1, and m is a positive integer greater than 1.
On the other hand, the embodiment of the invention also provides an organic light-emitting display device which comprises the organic light-emitting display panel.
One of the above technical solutions has the following beneficial effects:
by adopting the technical scheme provided by the embodiment of the invention, the anode is set as the composite anode and comprises the total reflection anode, the first transparent electrode and the semi-transmission semi-reflection anode which are arranged in a laminated manner, and the cavity length of the microcavity formed between each anode layer and the cathode is adjusted, so that the optical path difference of light in two adjacent microcavities is integral multiple of half wavelength, interference long-strip components can be satisfied after the interference light in a plurality of microcavities is mutually superposed, the intensity of the same wavelength is enhanced, the offset of the peak wavelength of the same color light is reduced, the offset of the peak wavelength of the same color light under a large visual angle compared with a normal visual angle is further effectively reduced, the spectrum shapes under the large visual angle and the normal visual angle are approximate, and the color cast phenomenon under the large visual angle is effectively improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only 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 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 device provided in an embodiment of the present invention;
FIG. 3 is a diagram illustrating a comparison of chroma offset values at different viewing angles according to an embodiment of the present invention and the prior art;
FIG. 4 is a comparison of spectra of an embodiment of the present invention and a prior art;
fig. 5 is a schematic view of another structure of an organic light emitting device according to an embodiment of the present invention;
fig. 6 is a schematic view of another structure of an organic light emitting device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an organic light emitting device according to an embodiment of the present invention;
fig. 8 is a schematic view illustrating an extending direction of metal stripe electrodes in an organic light emitting device according to an embodiment of the present invention;
fig. 9 is another schematic view of an extending direction of metal strip electrodes in an organic light-emitting device according to an embodiment of the present invention;
fig. 10 is another schematic view illustrating an extending direction of metal stripe electrodes in an organic light emitting device according to an embodiment of the present invention;
fig. 11 is a schematic view of still another structure of an organic light emitting device according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of an organic light emitting display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. 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.
An embodiment of the present invention provides an organic light emitting display panel, as shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an organic light emitting display panel provided in an embodiment of the present invention, and fig. 2 is a schematic structural diagram of an organic light emitting device provided in an embodiment of the present invention, where the organic light emitting display panel includes: a base substrate 1; a plurality of organic light emitting devices 2 formed on the substrate 1, the organic light emitting devices 2 including a composite anode 3, a light emitting layer 4 and a cathode 5 which are laminated in a light emitting direction.
The composite anode 3 comprises n anode layers 6 and n-1 first transparent electrodes 7, and the anode layers 6 and the first transparent electrodes 7 are arranged at intervals along the light emergent direction; the n anode layers 6 are a total reflection anode 8 and n-1 semi-transmission semi-reflection anodes 9, and the semi-transmission semi-reflection anodes 9 are positioned between the total reflection anode 8 and the cathode 5; in the n anode layers 6, an ith microcavity is formed between the ith anode layer 6 and the cathode 5, and the optical path length of light in the ith microcavity is LiLight in the (i + 1) th microcavityHas an optical path length of Li+1，
Wherein λ is wavelength, i is 1 to n-1, and m is a positive integer greater than 1.
Specifically, referring to fig. 2 again, taking the composite anode 3 including a semi-transmissive and semi-reflective anode 9 and a total-reflective anode 8 as an example, a first micro-cavity 101 is formed between the semi-transmissive and semi-reflective anode 9 and the cathode 5, and a second micro-cavity 102 is formed between the total-reflective anode 8 and the cathode 5, assuming that the optical path of light in the first micro-cavity 101 is set as a half wavelength, the optical path of light in the second micro-cavity 102 is set as a wavelength, taking the light reflected by the anode layer 6 for the first time and incident on the cathode 5 as an example, the optical path of light in the second micro-cavity 102 reflected by the total-reflective anode 8 and transmitted to the cathode 5 corresponds to the optical path of light in the first micro-cavity 101 reflected by the semi-transmissive and semi-reflective anode 9 and transmitted to the cathode 5, which differs by a whole wavelength, and satisfies an interference phase condition, therefore, after the interference lights in the first micro-cavity 101 and the second micro-cavity 102 are superimposed, the, the shift amount of the peak wavelength of the emitted light is reduced.
Therefore, with the organic light emitting display panel provided by the embodiment of the present invention, the anode is set as the composite anode 3, so that the organic light emitting display panel includes the stacked total-reflection anode 8, the first transparent electrode 7 and the semi-transmission semi-reflection anode 9, and the cavity length of the microcavity formed between each anode layer 6 and the cathode 5 is adjusted, so that the optical path difference of light in two adjacent microcavities is an integral multiple of half wavelength, and after the interference light in a plurality of microcavities is stacked, an interference phase condition is satisfied, the intensity of the same wavelength is enhanced, the offset of the peak wavelength of the same color light is reduced, and further, the offset of the peak wavelength of the same color light in a large viewing angle compared with the peak wavelength of the same color light in a front viewing angle is effectively reduced, so that the spectrum shape in the large viewing angle is similar to the spectrum shape in the front viewing angle, and the color cast phenomenon in the.
In the following, taking m 1 and n 2 as examples, transmission of light in a microcavity with an optical path of half wavelength is referred to as a first-order resonance mode, transmission of light in a microcavity with an optical path of one wavelength is referred to as a second-order resonance mode, and when the first-order resonance mode and the second-order resonance mode coexist, it is referred to as a composite resonance mode, further, with reference to fig. 3 and table 1, fig. 3 is a schematic diagram comparing chromaticity shift values at different viewing angles in an embodiment of the present invention and the prior art, in the prior art, an anode includes only one total reflection anode, the total reflection anode and a cathode form only one microcavity, and the optical path of light in the microcavity is a whole wavelength, and at this time, light has the second-order resonance mode when propagating in the microcavity, as can be seen from fig. 3, and the chromaticity shift value △ u ' v ' corresponding to the composite resonance mode of the embodiment of the present invention is significantly lower than the chromaticity shift value △ u ' corresponding to the conventional second-order resonance mode at the same viewing angle.
| Angle of view (°) | △ u ' v ' in composite resonance mode ' | △ u ' v ' at second order resonance mode ' |
| 0 | 0 | 0 |
| 15 | 0.002439 | 0.003904 |
| 30 | 0.008403 | 0.01377 |
| 45 | 0.015267 | 0.024538 |
| 60 | 0.022281 | 0.032846 |
TABLE 1
In addition, it should be further noted that, referring to fig. 4, fig. 4 is a spectrum comparison diagram of the embodiment of the present invention and the prior art, and it can be seen from fig. 4 that, at each wavelength, the normalized intensity corresponding to the composite resonance mode of the embodiment of the present invention and the normalized intensity corresponding to the existing second-order resonance mode tend to be the same, that is, the spectral shape corresponding to the composite resonance mode is similar to the spectral shape corresponding to the second-order resonance mode, and after the structure of the anode is improved in the embodiment of the present invention, the light color emitted by the organic light emitting device 2 is similar to the light color emitted by the existing organic light emitting device, and does not have adverse effect on the light color.
In addition, it should be noted that, as can be seen from table 2, under the same viewing angle, the light-emitting luminance of the organic light-emitting device 2 in the complex resonance mode is significantly higher than that of the organic light-emitting device 2 in the existing second-order resonance mode, and the brightness can be increased by more than 30%. Therefore, the composite resonance mode provided by the embodiment of the invention can improve the luminous brightness to a certain extent and optimize the display effect.
| Angle of view (°) | Luminance in complex resonance mode | Luminance in second |
| 0 | 1106 | 807 |
| 15 | 1039 | 771 |
| 30 | 832 | 623 |
| 45 | 540 | 387 |
| 60 | 278 | 185 |
TABLE 2
Optionally, m is 1, that is, the difference between the optical lengths of light in two adjacent micro cavities is only one half wavelength, and on the premise that the interaction of light in the composite micro cavity satisfies the interference constructive condition, the cavity length of each micro cavity is reduced, so that the film thickness of the composite anode 3 is reduced, and the reduction of the overall thickness of the organic light-emitting display panel is realized.
Alternatively, in order to further reduce the film thickness of the composite anode 3, n may be 2, that is, the composite anode 3 includes only one semi-transmissive and semi-reflective anode 9 and one total-reflective anode 8.
Optionally, referring to fig. 2 again, a first cavity length CL1 is formed between the total reflective anode 8 and the transflective anode 9, and a second cavity length CL2 is formed between the transflective anode 9 and the cathode 5; the optical path of the light in the first cavity length CL1 is l1, the optical path of the light in the second cavity length CL2 is l2, | l1-l2| < 30 nm. The difference value between the two is smaller than 30nm, the optical paths of the light in the first cavity length CL1 and the second cavity length CL2 can be approximate, so that the optical path of the light in the first microcavity 101 is about half of the optical path of the light in the second microcavity 102, interference constructive conditions are met after the interference lights in the two microcavities are mutually superposed, and the offset of the peak wavelength of the light with the same color is effectively reduced.
Alternatively, as shown in fig. 5, fig. 5 is another schematic structural diagram of the organic light emitting device according to the embodiment of the present invention, a hole functional layer 11 is disposed between the transflective anode 9 and the light emitting layer 4, and an electronic functional layer 12 is disposed between the light emitting layer 4 and the cathode 5, where the hole functional layer 11 may specifically include a hole injection layer and a hole transport layer, where the hole injection layer is located on a side of the transflective anode 9 facing away from the substrate 1, and the hole transport layer is located on a side of the hole injection layer facing away from the substrate 1; the electron function layer 12 may specifically include an electron transport layer and an electron injection layer, the electron transport layer is located on the side of the light emitting layer 4 facing away from the substrate 1, and the electron injection layer is located on the side of the electron transport layer facing away from the substrate 1. The optical path of light in the hole functional layer 11 is l3, the optical path of light in the electronic functional layer 12 is l4, | l3-l4| < 20nm, so that the optical path difference between light emitted by the light-emitting layer 4 and directly incident to the cathode 5 and light reflected to the cathode 5 through the anode layer 6 is reduced, and the influence of mutual superposition of interference light in the microcavity on the peak wavelength offset is further reduced.
Alternatively, as shown in fig. 6, fig. 6 is a schematic view of another structure of the organic light emitting device according to the embodiment of the present invention, in which a first cavity length CL1 is formed between the total reflective anode 8 and the transflective anode 9, and a second cavity length CL2 is formed between the transflective anode 9 and the cathode 5; the organic light emitting device 2 includes a red organic light emitting device 13, a green organic light emitting device 14, and a blue organic light emitting device 15; in the red organic light emitting device 13, the optical path length of light in the first cavity length CL1 is l11, the optical path length of light in the second cavity length CL2 is l21, in the green organic light emitting device 14, the optical path length of light in the first cavity length CL1 is l12, the optical path length of light in the second cavity length CL2 is l22, in the blue organic light emitting device 15, the optical path length of light in the first cavity length CL1 is l13, the optical path length of light in the second cavity length CL2 is l23, l11 > l12 > l13, and l21 > l22 > l 23.
It should be noted that the optical paths of the light corresponding to each organic light emitting device 2 in the first cavity length CL1 and the second cavity length CL2 can satisfy the above conditions by adjusting the thickness of the film layers in the red organic light emitting device 13, the green organic light emitting device 14, and the blue organic light emitting device 15. Specifically, the process flow of forming the red organic light emitting device 13, the green organic light emitting device 14, and the blue organic light emitting device 15 may include: forming a total reflection anode 8, wherein the total reflection anode 8 in the red organic light emitting device 13, the green organic light emitting device 14 and the blue organic light emitting device 15 have the same thickness; forming a first transparent electrode 7, the thickness of the first transparent electrode 7 being decreased in the red organic light emitting device 13, the green organic light emitting device 14, and the blue organic light emitting device 15; forming a semi-transmissive and semi-reflective anode 9, the semi-transmissive and semi-reflective anode 9 having the same thickness in the red organic light emitting device 13, the green organic light emitting device 14, and the blue organic light emitting device 15; the thicknesses of the hole function layers 11 in the red organic light emitting device 13, the green organic light emitting device 14, and the blue organic light emitting device 15 are decreased by one to form the light emitting layer 4.
Because the wavelengths corresponding to the red light, the green light and the blue light are different, and the wavelengths of the red light, the green light and the blue light are gradually reduced, the optical path corresponding to the organic light emitting device 2 of each color satisfies the above conditions, so that the cavity length of the microcavity in the organic light emitting device 2 of each color can be matched with the wavelength of the light of the corresponding color, and further, the light emitted by the organic light emitting device 2 of different colors can satisfy the interference phase long condition in the composite microcavity, and the offset of the peak wavelength of the light of each color is effectively reduced.
Further, the red light wavelength is λ 1,
the wavelength of the green light is lambda 2,
the wavelength of the blue light is a 3,
for the organic light emitting device 2 of each color, the difference between the optical paths of the light in the first cavity length CL1 and the second cavity length CL2 and the half wavelength of the light of the corresponding color is smaller than 30nm, so that the optical paths of the light in the first cavity length CL1 and the second cavity length CL2 are approximate and both approximate to the half wavelength, the optical path of the light in the first microcavity 101 is about half of the optical path of the light in the second microcavity 102, after the interference lights in the two microcavities are mutually overlapped, an interference phase condition is met, and the offset of the peak wavelength of each color light is effectively reduced.
Alternatively, as shown in fig. 7, fig. 7 is a schematic structural diagram of an organic light emitting device according to an embodiment of the present invention, in which the transflective anode 9 has a grating structure, and the transflective anode 9 includes a plurality of metal strip electrodes 16 arranged at intervals. By setting the transflective anode 9 to have a grating structure, a gap is formed between the metal strip electrodes 16, and the existence of the gap can increase the contact area between the metal strip electrodes 16 and the organic material, increase the adhesion between the metal strip electrodes and the organic material, and prevent the transflective anode 9 from falling off.
Further, in order to ensure good conductivity of the transflective anode 9 and sufficient contact area between the metal strip electrodes 16 and the organic material, the width of each metal strip electrode 16 is 100nm, and the distance between two adjacent metal strip electrodes 16 is 30 nm.
Further, referring to fig. 7 again, the organic light emitting device 2 further includes a hole functional layer 11 and an electron functional layer 12, the hole functional layer 11 is located on a side of the light emitting layer 4 facing the total reflection anode 8, and the electron functional layer 12 is located on a side of the light emitting layer 4 facing the cathode 5; the film material of the hole functional layer 11 is filled in the gap between the metal strip electrodes 16, namely, the hole functional layer 11 is in contact with the film material of the metal strip electrodes 16, so that the adhesive force between the metal strip electrodes 16 and the hole functional layer 11 is increased, the metal strip electrodes 16 are prevented from being separated from the hole functional layer 11, and the stability of the semi-transmission semi-reflection anode 9 is improved.
Alternatively, as shown in fig. 8 and 9, fig. 8 is a schematic diagram of an extending direction of metal strip electrodes in the organic light emitting device provided by the embodiment of the present invention, fig. 9 is another schematic diagram of an extending direction of metal strip electrodes in the organic light emitting device provided by the embodiment of the present invention, the organic light emitting display panel further includes gate lines Scan and Data lines Data arranged in a cross-insulation manner, the gate lines Scan extend along a first direction, and the Data lines Data extend along a second direction; the metal strip-shaped electrodes 16 in all the organic light emitting devices 2 extend in the first direction; alternatively, the metal strip electrodes 16 in all the organic light emitting devices 2 extend in the second direction. Compared with the region where the gap between the metal strip electrodes 16 is located, the region where the metal strip electrodes 16 are located can form a microcavity with the cathode 5, and the microcavity further forms a composite microcavity with other microcavities, so that the reduction of the offset of the peak wavelength of light emitted from the region where the metal strip electrodes 16 are located is ensured, and when the metal strip electrodes 16 in all the organic light-emitting devices 2 extend along the first direction or the second direction, the color shift in the first direction or the second direction can be effectively improved.
Alternatively, as shown in fig. 10, fig. 10 is another schematic view of the extending direction of the metal strip electrodes in the organic light emitting device provided in the embodiment of the present invention, the organic light emitting display panel further includes gate lines Scan and Data lines Data, which are arranged in a cross-insulating manner, the gate lines Scan extend along a first direction, and the Data lines Data extend along a second direction; in the adjacent two organic light emitting devices 2, the metal strip-shaped electrode 16 in one organic light emitting device 2 extends in the first direction, and the metal strip-shaped electrode 16 in the other organic light emitting device 2 extends in the second direction. Because the offset of the peak wavelength of the light emitted from the region where the metal strip electrode 16 is located is low, the extending directions of the metal strip electrodes 16 in two adjacent organic light emitting devices 2 are different, so that the color shift in the first direction and the color shift in the second direction can be improved simultaneously, the improvement degree of the color shift in the first direction and the color shift in the second direction is equivalent, and the color shift improvement effect is optimized.
Alternatively, as shown in fig. 11, fig. 11 is a schematic view of another structure of the organic light emitting device provided in the embodiment of the present invention, and the composite anode 3 further includes a second transparent electrode 17, and the second electrode layer is located between the light emitting layer 4 and the anode layer 6 closest to the light emitting layer. In the prior art, the anode is generally formed by two transparent electrodes and a metal electrode positioned between the two transparent electrodes, that is, a transparent electrode is arranged between the light-emitting layer and the metal electrode, and in the embodiment of the present invention, a second transparent electrode 17 is also arranged between the cathode 5 and the anode layer 6 closest to the cathode 5, so that the contact environment between the composite anode 3 of the embodiment of the present invention and the existing anode can be closer, the performance difference between the composite anode 3 and the existing anode can be reduced, the injection of holes can be increased, and the light emission amount of the light-emitting layer 4 can be increased.
Optionally, the anode layer 6 is made of silver, and the thickness of the total-reflection anode 8 is greater than that of the semi-transmission and semi-reflection anode 9, so as to ensure that the light transmittance of the semi-transmission and semi-reflection anode 9 is less than that of the total-reflection anode 8, thereby ensuring that light can further enter the total-reflection anode 8 through the semi-transmission and semi-reflection anode 9.
Optionally, the material of the first transparent electrode 7 includes indium tin oxide or indium zinc oxide with high light transmittance, so as to reduce the loss of light during the transmission of the first transparent electrode 7.
As shown in fig. 12, fig. 12 is a schematic structural diagram of an organic light emitting display device provided in an embodiment of the present invention, and the organic light emitting display device includes the organic light emitting display panel 100. The specific structure of the organic light emitting display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 12 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
Since the organic light emitting display device provided by the embodiment of the invention includes the organic light emitting display panel 100, by using the organic light emitting display device, the offset of the peak wavelength of light with the same color at a large viewing angle compared with that at a front viewing angle can be effectively reduced, so that the spectral shapes at the large viewing angle and the front viewing angle are similar, the color cast phenomenon at the large viewing angle is effectively improved, and the display effect is optimized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
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 (16)
1. An organic light emitting display panel, comprising:
a substrate base plate;
a plurality of organic light emitting devices formed on the substrate, the organic light emitting devices including a composite anode, a light emitting layer, and a cathode stacked in a light emitting direction;
the composite anode comprises n anode layers and n-1 first transparent electrodes, and the anode layers and the first transparent electrodes are arranged at intervals along the light emergent direction; the n anode layers are a total reflection anode and n-1 semi-transmission semi-reflection anodes, and the semi-transmission semi-reflection anodes are positioned between the total reflection anode and the cathode;
in the n anode layers, an ith micro-cavity is formed between the ith anode layer and the cathode, and the optical path of light in the ith micro-cavity is LiThe optical path of light in the (i + 1) th micro-cavity is Li+1，
Wherein λ is waveLength, i is 1 to n-1, and m is a positive integer greater than 1.
2. The organic light-emitting display panel according to claim 1, wherein m is 1.
3. The organic light-emitting display panel according to claim 1, wherein n is 2.
4. The organic light-emitting display panel of claim 3, wherein the total reflective anode and the transflective anode have a first cavity length therebetween, and the transflective anode and the cathode have a second cavity length therebetween;
the optical path length of the light in the first cavity length is l1, the optical path length of the light in the second cavity length is l2, | l1-l2| < 30 nm.
5. The organic light-emitting display panel according to claim 3, wherein a hole functional layer is provided between the transflective anode and the light-emitting layer, and an electron functional layer is provided between the light-emitting layer and the cathode;
the optical path of light in the hole functional layer is l3, the optical path of light in the electron functional layer is l4, | l3-l4| < 20 nm.
6. The organic light-emitting display panel of claim 3, wherein the total reflective anode and the transflective anode have a first cavity length therebetween, and the transflective anode and the cathode have a second cavity length therebetween;
the organic light emitting device comprises a red organic light emitting device, a green organic light emitting device and a blue organic light emitting device;
in the red organic light emitting device, an optical path of light in the first cavity length is l11, an optical path of light in the second cavity length is l21, in the green organic light emitting device, an optical path of light in the first cavity length is l12, an optical path of light in the second cavity length is l22, in the blue organic light emitting device, an optical path of light in the first cavity length is l13, an optical path of light in the second cavity length is l23, l11 > l12 > l13, and l21 > l22 > l 23.
7. The organic light-emitting display panel according to claim 6,
the red light has a wavelength of lambda 1,
the green light has a wavelength of 2,
the wavelength of the blue light is lambda 3,
8. the organic light-emitting display panel of claim 1, wherein the transflective anode has a grating structure and comprises a plurality of metal strip electrodes arranged at intervals.
9. The organic light-emitting display panel according to claim 8, wherein the width of the metal strip electrodes is 100nm, and the distance between two adjacent metal strip electrodes is 30 nm.
10. The organic light-emitting display panel according to claim 8,
the organic light-emitting device further comprises a hole functional layer and an electron functional layer, wherein the hole functional layer is positioned on one side, facing the total reflection anode, of the light-emitting layer, and the electron functional layer is positioned on one side, facing the cathode, of the light-emitting layer;
and film layer materials of the cavity function layer are filled in gaps among the metal strip electrodes.
11. The organic light-emitting display panel according to claim 8, further comprising gate lines and data lines arranged to cross each other with insulation, the gate lines extending in a first direction, and the data lines extending in a second direction;
the metal strip-shaped electrodes in all the organic light-emitting devices extend along the first direction;
or, the metal strip-shaped electrodes in all the organic light-emitting devices extend along the second direction.
12. The organic light-emitting display panel according to claim 8, further comprising gate lines and data lines arranged to cross each other with insulation, the gate lines extending in a first direction, and the data lines extending in a second direction;
in two adjacent organic light emitting devices, the metal strip-shaped electrode in one of the organic light emitting devices extends along the first direction, and the metal strip-shaped electrode in the other of the organic light emitting devices extends along the second direction.
13. The organic light-emitting display panel of claim 1, wherein the composite anode further comprises a second transparent electrode, the second electrode layer being located between the light-emitting layer and the anode layer closest thereto.
14. The organic light-emitting display panel according to claim 1, wherein the material of the anode layer comprises silver, and a thickness of the total-reflection anode is greater than a thickness of the transflective anode.
15. The organic light-emitting display panel according to claim 1, wherein a material of the first transparent electrode comprises indium tin oxide or indium zinc oxide.
16. An organic light-emitting display device comprising the organic light-emitting display panel according to any one of claims 1 to 15.
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