CN109192882B - A display panel and display device - Google Patents
A display panel and display device Download PDFInfo
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- CN109192882B CN109192882B CN201811290206.7A CN201811290206A CN109192882B CN 109192882 B CN109192882 B CN 109192882B CN 201811290206 A CN201811290206 A CN 201811290206A CN 109192882 B CN109192882 B CN 109192882B
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Abstract
An embodiment of the present application provides a display panel, including: a substrate, and an organic light emitting device disposed on the substrate; the organic light-emitting device comprises a first electrode, an organic layer and a second electrode which are sequentially arranged on the substrate; the composite reflecting layer is arranged on one side, away from the first electrode, of the organic layer; the composite reflective layer comprises an organic reflective material and an inorganic reflective material; the reflectivity of the organic material is less than or equal to 10 percent, and the reflectivity of the inorganic reflecting material is more than or equal to 60 percent. The color cast value of the display panel under a large visual angle can be reduced, and the optimal display effect is obtained.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel and a display device.
[ background of the invention ]
The reflectivity of the cathode and the anode can be improved in the OLED display panel to increase the microcavity effect so as to improve the color purity of the display panel. However, the increase in reflectance causes a decrease in transmittance, a decrease in light emission efficiency, and deterioration in viewing angle color shift. In order to obtain optimal color purity and luminous efficiency, the thicknesses of the cathode and the anode are required to be strict, and thus, a severe challenge is posed to the process of forming the cathode and the anode.
[ summary of the invention ]
Embodiments of the present invention provide a solution to the above technical problem.
In one aspect, embodiments of the present invention provide a display panel, a substrate, and an organic light emitting device disposed on the substrate; the organic light-emitting device comprises a first electrode, an organic functional layer and a second electrode which are sequentially arranged on the substrate; the composite reflecting layer is provided with one side of the organic functional layer far away from the first electrode; the composite reflective layer comprises an organic reflective material and an inorganic reflective material; the reflectivity of the organic material is less than or equal to 10 percent, and the reflectivity of the inorganic reflecting material is more than or equal to 60 percent. .
In another aspect, an embodiment of the present invention provides a display device, including the display panel described above.
The color cast value of the display panel under a large visual angle can be reduced, and the optimal display effect is obtained.
[ 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 view of a display panel according to an embodiment of the present application;
FIG. 2 is a graph of the light emission peaks for different reflectances;
FIG. 3 is a schematic view of a display panel according to another embodiment of the present application;
FIG. 4 is a schematic view of a display panel according to yet another embodiment of the present application; (ii) a
FIG. 5 is a schematic view of a display panel according to yet another embodiment of the present application;
FIG. 6 is a schematic view of a display panel according to yet another embodiment of the present application;
FIG. 7 is a schematic view of color shift from different viewing angles;
FIG. 8 is a schematic view of a display device according to an embodiment of the present application;
FIG. 9 is a schematic view of a display device according to an embodiment of the present application;
FIG. 10 is a top view of the display device of FIG. 9;
FIG. 11 is a left side view of the display device of FIG. 9;
FIG. 12 is a schematic view of a display device according to an embodiment of the present application;
fig. 13 is a schematic view of a display device according to still another embodiment of the present application.
[ 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.
It should be understood that although the terms first, second, third, etc. may be used to describe the electrodes in embodiments of the present invention, the electrodes should not be limited to these terms. These terms are only used to distinguish the electrodes from each other. For example, a first electrode may also be referred to as a second electrode, and similarly, a second electrode may also be referred to as a first electrode, without departing from the scope of embodiments of the present invention.
The microcavity effect can enhance light of specific wavelengths and weaken light of other wavelengths to achieve narrower half-peak width, thereby improving color purity. The reflectivity of the cathode and the anode can be improved in the OLED display panel to increase the microcavity effect so as to improve the color purity of the display panel. However, the increase in reflectance causes a decrease in transmittance, a decrease in light emission efficiency, and deterioration in viewing angle color shift. In order to obtain optimal color purity and luminous efficiency, the thicknesses of the cathode and the anode are required to be strict, and thus, a severe challenge is posed to the process of forming the cathode and the anode. Moreover, even if the thicknesses of the cathode and the anode are well controlled, the prior art only finds a balance point, does not solve the problem fundamentally, and cannot simultaneously have excellent color purity, high luminous efficiency and color cast at a viewing angle.
Referring to fig. 1, fig. 1 is a schematic view of a display panel according to an embodiment of the present application; the display panel of the present application includes a substrate 10, and an organic light emitting device disposed on the substrate 10; the organic light emitting device includes a first electrode 21, an organic functional 22 layer, and a second electrode 23 sequentially disposed on a substrate 10;
a composite reflective layer 30, wherein the composite reflective layer 30 is arranged on one side of the organic functional layer 22 far away from the first electrode 21; the composite reflective layer 30 includes an organic reflective material and an inorganic reflective material; the reflectivity of the organic material is less than or equal to 10 percent, and the reflectivity of the inorganic reflective material is more than or equal to 60 percent.
Taking the first electrode as an anode and the second electrode as a cathode as an example; the first electrode may be of ITO/Ag/ITO construction, where Ag primarily serves as a total reflection and ITO serves to protect Ag and match work function for hole injection. The second electrode may be a thin layer of Ag alloy as a semi-reflective and semi-transparent electrode. In the prior art, the material of the second electrode must be matched with the work function of the electron injection layer (or the electron transport layer), and is limited, so that the reflectivity is a constant value, and the total reflectivity can be adjusted only by the thickness. In other words, the reflectance is greatly affected by the thickness. As shown in fig. 2, although the thickness is slightly larger, the reflectance is improved, the half-peak width is reduced, and the color purity is improved, the transmittance is reduced, the light emission efficiency is reduced, and the viewing angle color shift is deteriorated. The thickness is slightly smaller, the reflectivity is reduced, the half-peak width is widened, the transmittance is increased, the luminous efficiency is improved, the visual angle color cast is improved, but the color purity is reduced. In the present application, the composite reflective layer 30 is further included, and the composite reflective layer includes both an organic reflective material (low reflectivity) and an inorganic reflective material (high reflectivity), and the reflectivity of the composite reflective layer can be adjusted by adjusting the ratio and thickness of the organic reflective material and the inorganic reflective material. That is, the reflectance is mainly determined by the ratio of the inorganic reflective material to the organic reflective material, and the thickness has only a small influence. This allows to obtain a desired reflectivity over a relatively large thickness range, so that the thickness uniformity requirements in mass production are greatly reduced.
In one embodiment of the present application, as shown in fig. 1, the composite reflective layer 30 is disposed on a side of the second electrode 23 adjacent to the organic layer 22; the LUMO of the organic reflective material in the composite reflective layer of the composite reflective layer is between 2.1 and 3.1 ev; HOMO is between 5.7 and 6.5 ev; and the carrier mobility of the composite reflecting layer is greater than that of the organic reflecting material and less than that of the second electrode. Since the composite reflective layer is disposed between the second electrode 23 and the organic layer 22, taking the second electrode 22 as a cathode as an example, the composite reflective layer needs to play a role of transporting electrons, and therefore, the LUMO of the organic reflective material in the composite reflective layer needs to be disposed between 2.1 ev and 3.1 ev; HOMO is between 5.7 and 6.5 ev; and the carrier mobility of the composite reflecting layer is greater than that of the organic reflecting material and less than that of the second electrode. Within the range to ensure the normal operation of the device.
In another embodiment of the present application, as shown in fig. 3, fig. 3 is a schematic view of a display panel of another embodiment of the present application; the composite reflective layer includes a first composite reflective layer 301 and a second composite reflective layer 302;
the first composite reflective layer 301 is disposed on a side of the second electrode close to the organic layer 22; the LUMO of the organic reflective material in the first composite reflective layer of the composite reflective layer is between 2.1 and 3.1 eV; HOMO is between 5.7 and 6.5 ev; and the carrier mobility of the first composite reflecting layer is greater than that of the organic reflecting material and less than that of the second electrode. The second composite reflective layer 302 is disposed on a side of the second electrode away from the organic layer 22; the LUMO of the organic reflective material in the second composite reflective layer of the composite reflective layer is between 1.7 and 3.2 eV; HOMO is between 4.8 and 6.0 ev; and the carrier mobility of the second composite reflective layer is greater than that of the organic reflective material and less than that of the second electrode.
Since the first composite reflective layer 301 is disposed between the second electrode 23 and the organic layer 22, here, taking the second electrode 22 as a cathode as an example, the composite reflective layer needs to play a role of transporting electrons, the LUMO of the organic reflective material in the composite reflective layer needs to be disposed between 2.1 ev and 3.1 ev; HOMO is between 5.7 and 6.5 ev; and the carrier mobility of the first composite reflecting layer is larger than the carrier mobility of the organic reflecting material and smaller than the carrier mobility range of the second electrode, so that the normal work of the device is ensured. And the second composite reflective layer is disposed outside the second electrode 23, the voltage drop of the resistance of the second electrode can be reduced according to the arrangement of the second composite reflective layer 302 of the present application, so that the display of the display panel is more uniform.
In yet another embodiment of the present application, as shown in fig. 4, fig. 4 is a schematic view of a display panel of yet another embodiment of the present application; the composite reflecting layer 30 is arranged on one side of the first electrode far away from the organic layer; the LUMO of the organic reflective material in the composite reflective layer of the composite reflective layer is between 2.1 and 3.1 ev; HOMO is between 5.7 and 6.5 ev; and the carrier mobility of the composite reflective layer is greater than the carrier mobility of the organic reflective material and less than the carrier mobility of the second electrode, the voltage drop of the resistance of the second electrode can be reduced by the arrangement of the second composite reflective layer 302 according to the present application, so that the display of the display panel is more uniform.
In some embodiments of the present application, the inorganic reflective material is an alkali metal material, and the volume ratio of the alkali metal material in the composite reflective layer is 1% to 90%. The alkali metal is a commonly used doping material in the organic light-emitting device, so that the co-evaporation process is relatively mature, but the alkali metal is applied to the composite reflecting layer, so that the suitable emissivity of the alkali metal is utilized, and the alkali metal has certain carrier transmission capacity, so that the voltage of a cathode can be reduced, and meanwhile, the function of transmitting electrons can be achieved.
Further, the alkali metal material comprises lithium, and the volume fraction of the lithium is 1-60%. The reflectivity of lithium is high, and the electron transmission rate is high, so that the dosage of the lithium in the composite reflecting layer can be reduced, and the cost can be reduced while the requirement of the application is met.
In some embodiments of the present application, the inorganic reflective material is a rare earth material, and a volume ratio of the rare earth material in the composite reflective layer is 1% to 90%. The rare earth material is another common doping material in the organic light-emitting device, so that the co-evaporation process is relatively mature, but the rare earth material is applied to the composite reflecting layer, on one hand, the appropriate emissivity of the rare earth material is utilized, on the other hand, the rare earth material has certain carrier transmission capacity, the voltage of a cathode can be reduced, and meanwhile, the effect of transmitting electrons can also be achieved.
Further, the rare earth material comprises ytterbium, and the volume fraction of the ytterbium is 1% -60%. Ytterbium has a relatively high reflectivity and a relatively high electron transfer rate, so that the amount of ytterbium used in the composite reflective layer can be reduced, and the cost can be reduced while the requirements of the application are met.
In some embodiments of the present application, the inorganic reflective material comprises a metal or a metal oxide, and the volume ratio of the inorganic reflective material in the composite reflective layer is 1% to 90%.
In some embodiments of the present application, organic reflective materials include fused ring aromatic hydrocarbons, which are materials commonly used in organic light emitting devices. However, the composite reflective layer is prepared by taking the reflective material as a reflective material for the first time, on one hand, the carrier transport capability of the reflective material is utilized, on the other hand, the low reflectivity of the reflective material is utilized to be mixed with the high reflectivity of the inorganic material, so that the reflectivity part is only influenced by the thickness, the ideal reflectivity can be obtained in a relatively large thickness range, and the requirement on the thickness uniformity during the mass production is greatly reduced.
Referring further to fig. 5, fig. 5 is a schematic view of a display panel according to another embodiment of the present application; the organic light emitting devices of the display panel of the present embodiment include a red organic light emitting device, a green organic light emitting device, and a blue organic light emitting device;
the composite reflective layer comprises a first composite reflective layer 30a covering the red organic light emitting device, and a second composite reflective layer 30b covering the green organic light emitting device; a third composite reflective layer 30c covering the blue organic light emitting device; the volume fraction of the inorganic reflective material in the first composite reflective layer is greater than the volume fraction of the inorganic reflective material in the second composite reflective layer, and the volume fraction of the inorganic reflective material in the second composite reflective layer is greater than the volume fraction of the inorganic reflective material in the third composite reflective layer.
The human eye is insensitive to blue and therefore blue appears darkest at the same brightness. In contrast, the human eye is most sensitive to red, which is brightest at the same brightness. According to the embodiment, the volume fraction of the inorganic material in the third composite reflective layer corresponding to blue is minimized, so that the reflectivity is low, the small visual angle color cast is achieved, meanwhile, the transmittance is high, the defect that human eyes are insensitive to the inorganic material is overcome, and the brightness of the inorganic material can be matched with red. In general, it is exactly the best balance of each different colour's pixel in order to obtain reflectivity and transmissivity, and its demand is inequality, and this application sets up three compound reflection stratum alone, matches different colours for three kinds of colours can both reach the optimum balance state of colour purity and luminous efficiency and visual angle colour cast, have promoted display panel's display effect.
In another embodiment, the organic light emitting device includes a red organic light emitting device, a green organic light emitting device, and a blue organic light emitting device;
the composite reflective layer includes a first composite reflective layer 30a covering the red organic light emitting device, a second composite reflective layer 30b covering the green organic light emitting device; a third composite reflective layer 30c covering the blue organic light emitting device; the thickness of the first composite reflecting layer is greater than that of the second composite reflecting layer and less than that of the third composite reflecting layer. Illustratively, the thickness of the first composite reflective layer 30a ranges from 250nm to 300 nm; the thickness range of the second composite reflecting layer 30b is 180-250 nm; the thickness range of the third composite reflecting layer 30c is 150-200 nm;
with the aforesaid is the same, just the pixel of each different colour is in order to obtain the optimum balance of reflectivity and transmissivity, and its demand is inequality, and this application sets up three compound reflection stratum alone, matches different colours for three kinds of colours can both reach the optimum balanced state of colour purity and luminous efficiency and visual angle colour cast, have promoted display panel's display effect. And will not be described in detail herein.
With continuing reference to fig. 6 and 7, fig. 6 is a schematic diagram of a display panel according to yet another embodiment of the present application; FIG. 7 is a schematic view of color shift from different viewing angles;
a display panel center region 102 of the present application and an edge region 102 surrounding the center region; in the central region 101, the volume fraction of the inorganic reflective material in the composite reflective layer is M in the edge region 102, and the volume fraction of the inorganic reflective material in the composite reflective layer is N. Wherein M > N. The existing way of testing color consistency is to test color coordinates at different positions of the display panel in a direction perpendicular to the viewing direction of the display panel, however, it ignores a problem that the consumer is in a fixed position while viewing the picture of the display panel. This results in the consumer viewing the central area 101 and the edge area 102 at different actual viewing angles at the same time. Referring to fig. 7, it can be seen from fig. 7 that the color coordinates at an observation angle of 30 degrees when the relative reflectance is 11 are approximately the same as the color coordinates at an observation angle of 0 degrees when the relative reflectance is 18. Whereas at 0 degree viewing angle, the same reflectance 11 is different in color. That is, when the reflectivity of the composite reflective layer is uniform, the color of the central region 102 may be different from the color of the edge region 102 when a consumer views the display panel in a normal posture, which may greatly reduce the appreciation of the displayed image. In the application, the inventor breakthroughs in the reduction of the doping ratio of the inorganic reflective material in the composite reflective layer in the edge region to reduce the relative reflectivity thereof, so that the same color as that of the central region can be achieved, and the color consistency of the whole display panel is ensured.
On the other hand, the reflectance in the edge area is low, and the color shift of the viewing angle is also improved. The secondary method can simultaneously combine excellent color purity, high luminous efficiency and color cast at viewing angles. Not just to find a balance point therein.
Furthermore, the volume fraction of the inorganic reflective material in the composite reflective layer is M in the edge region 102, the volume fraction of the inorganic reflective material in the composite reflective layer is N, and M is greater than or equal to 1.1N. As can be seen from fig. 7, the slope of the line at the observation angle of 30 degrees is much lower than the slope of the line at the observation angle of 0 degrees. That is, the adjustment of the reflectivity for the color is slow, in other words, the reflectivity needs to be greatly improved to compensate for the difference of the color, so the volume fraction M of the inorganic reflective material in the central region needs to exceed the volume fraction N of the inorganic material in the edge region by more than 10%. To ensure that the color differences can be compensated.
Further, since the angle from the central region to the edge region is gradually changed rather than jump, the volume fraction of the inorganic reflective material in the composite reflective layer is gradually decreased in the direction in which the central region points to the edge region in order to make the color uniformity better.
With continuing reference to fig. 9, 10 and 11, fig. 9 is a schematic diagram of a display device according to an embodiment of the present application; FIG. 10 is a top view of the display device of FIG. 9; FIG. 11 is a left side view of the display device of FIG. 9;
the simulated consumer of fig. 9 views the tv scene in the room, and from the top view and the left view, the human eye has a much larger viewing angle for the edge area than for the center area, so that this design is particularly important in large screens.
Referring to fig. 8, fig. 8 is a schematic view of a display device according to another embodiment of the present application; the display panel of the embodiment includes a first bending region 107, a flat display region 105 and a second bending region 106 sequentially arranged along a first direction, and in a central region, the volume fraction of the inorganic reflective material in the composite reflective layer is X; in the first bending area and the second bending area, the volume fraction of the inorganic reflecting material in the composite reflecting layer is Y; wherein X > Y.
Referring to fig. 7, it can be seen from fig. 7 that the color coordinates at an observation angle of 30 degrees when the relative reflectance is 11 are approximately the same as the color coordinates at an observation angle of 0 degrees when the relative reflectance is 18. Whereas at 0 degree viewing angle, the same reflectance 11 is different in color. That is, when the reflectivity of the composite reflective layer is uniform, the color of the central region may be different from that of the edge region when a consumer views the display panel in a normal posture, which may greatly reduce the appreciation of the displayed image. In this embodiment, the viewing angle of the bending region is further increased compared with the viewing angle of the edge region in the previous embodiment, so that the inventor reduces the doping ratio of the inorganic reflective material in the composite reflective layer of the bending region to reduce the relative reflectivity thereof, thereby achieving the same color as the central region and ensuring the color uniformity of the whole display panel. Further, since the difference of the viewing angles is larger, in order to compensate for the color deviation caused by the difference of the viewing angles, X >1.2Y may be used.
Referring to fig. 12, fig. 12 is a schematic view of a display device according to an embodiment of the present application;
the display device shown in fig. 12 is an in-vehicle display device including a first display area 103 and a second display area 104; the connecting line of the center of the first display area 103 and the center of the steering wheel is approximately vertical to the plane where the first display is located; the included angle between the connecting line of the center of the second display area 104 and the center of the steering wheel and the plane where the second display area is located is 10-80 degrees; in the first display area 103, the volume fraction of the inorganic reflective material in the composite reflective layer is P; in the second display region 104, the volume fraction of the inorganic reflective material in the composite reflective layer is Q; wherein P > Q.
In the in-vehicle display, when a consumer sits in a driving seat, the viewing angle of the first area 103 is relatively small, and the viewing angle of the second display area 104 is relatively large, so that color unevenness occurs. In this embodiment, the reflectivity of the first display region 103 is relatively high, and as can be seen from the relationship between the color coordinates and the reflectivity in fig. 7, the colors of the regions with relatively large observation angles are close to each other, so as to achieve the color uniformity of the whole display panel.
On the other hand, the reflectance in the edge area is low, and the color shift of the viewing angle is also improved. The secondary method can simultaneously combine excellent color purity, high luminous efficiency and color cast at viewing angles. Not just to find a balance point therein.
The application also discloses a display device. The display device of the present application may be any device including the display panel as described above, including but not limited to a cellular phone 500, a tablet computer, a display of a computer, a display applied to a smart wearable device, a display applied to a vehicle such as an automobile, and the like as shown in fig. 13. The display device is considered to fall within the scope of protection of the present application as long as the display device includes the driving unit included in the display device disclosed in the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
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.
Claims (16)
1. A display panel, comprising:
a substrate, and an organic light emitting device disposed on the substrate; the organic light-emitting device comprises a first electrode, an organic functional layer and a second electrode which are sequentially arranged on the substrate;
the composite reflecting layer is arranged on one side, away from the first electrode, of the organic functional layer; the composite reflective layer comprises an organic reflective material and an inorganic reflective material; the reflectivity of the organic reflecting material is less than or equal to 10 percent, and the reflectivity of the inorganic reflecting material is more than or equal to 60 percent;
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;
the composite reflecting layer comprises a first composite reflecting layer covering the red organic light-emitting device and a second composite reflecting layer covering the green organic light-emitting device; a third composite reflective layer covering the blue organic light emitting device;
a volume fraction of the inorganic reflective material in the first composite reflective layer is greater than a volume fraction of the inorganic reflective material of the second composite reflective layer, and a volume fraction of the inorganic reflective material of the second composite reflective layer is greater than a volume fraction of the inorganic reflective material of a third composite reflective layer;
or,
the thickness of the first composite reflecting layer is greater than that of the second composite reflecting layer, and the thickness of the second composite reflecting layer is greater than that of the third composite reflecting layer.
2. The display panel according to claim 1, wherein the composite reflective layer is disposed on a side of the second electrode adjacent to the organic functional layer;
the LUMO of the organic reflecting material in the composite reflecting layer is between 2.1 and 3.1 ev; HOMO is between 5.7 and 6.5 ev; and the carrier mobility of the composite reflecting layer is greater than that of the organic reflecting material and less than that of the second electrode.
3. The display panel according to claim 1, wherein the composite reflective layer is disposed on a side of the second electrode away from the organic functional layer;
the LUMO of the organic reflecting material in the composite reflecting layer is between 1.7 and 3.2 ev; HOMO is between 4.8 and 6.0 ev; and the carrier mobility of the composite reflecting layer is greater than that of the organic reflecting material and less than that of the second electrode.
4. The display panel of claim 1, wherein the first composite reflective layer comprises a fourth composite reflective layer and a seventh composite reflective layer, wherein the second composite reflective layer comprises a fifth composite reflective layer and an eighth composite reflective layer, and wherein the third composite reflective layer comprises a sixth composite reflective layer and a ninth composite reflective layer; the fourth composite reflecting layer, the fifth composite reflecting layer and the sixth composite reflecting layer are arranged on one side, close to the organic functional layer, of the second electrode; the seventh composite reflecting layer, the eighth composite reflecting layer and the ninth composite reflecting layer are arranged on one side, far away from the organic functional layer, of the second electrode;
the LUMO of the organic reflective material in the fourth composite reflective layer, the fifth composite reflective layer and the sixth composite reflective layer is between 2.1 and 3.1 eV; HOMO is between 5.7 and 6.5 ev; and the carrier mobility of the fourth, fifth and sixth composite reflective layers is greater than the carrier mobility of the organic reflective material and less than the carrier mobility of the second electrode;
the LUMO of the organic reflective material in the seventh composite reflective layer, the eighth composite reflective layer and the ninth composite reflective layer is between 1.7 and 3.2 eV; HOMO is between 4.8 and 6.0 ev; and the carrier mobility of the seventh compound reflective layer, the eighth compound reflective layer and the ninth compound reflective layer is greater than the carrier mobility of the organic reflective material and less than the carrier mobility of the second electrode.
5. The display panel according to claim 1, wherein the inorganic reflective material is an alkali metal material, and a volume ratio of the alkali metal material in the composite reflective layer is 1% to 90%.
6. The display panel according to claim 5, wherein the alkali metal material comprises lithium, and the volume fraction of the lithium is 1% to 60%.
7. The display panel according to claim 1, wherein the inorganic reflective material is a rare earth material, and a volume ratio of the rare earth material in the composite reflective layer is 1% to 90%.
8. The display panel according to claim 7, wherein the rare earth material comprises ytterbium in a volume fraction of 1% to 60%.
9. The display panel according to claim 1, wherein the inorganic reflective material comprises a metal or a metal oxide, and the volume ratio of the inorganic reflective material in the composite reflective layer is 1% to 90%.
10. The display panel of claim 1 wherein the organic reflective material comprises a fused ring aromatic hydrocarbon.
11. The display panel according to claim 1, wherein the display panel includes a central region and an edge region surrounding the central region;
in the central region, the volume fraction of the inorganic reflective material in the composite reflective layer is M;
in the edge region, the volume fraction of the inorganic reflective material in the composite reflective layer is N;
wherein M > N.
12. The display panel of claim 11, wherein M ≧ 1.1N.
13. The display panel according to claim 11, wherein the volume fraction of the inorganic reflective material in the composite reflective layer gradually decreases in a direction in which the central region is directed to the edge region.
14. The display panel of claim 1, wherein the display panel comprises a first bending region, a flat display region and a second bending region arranged in sequence along a first direction,
in the plane display area, the volume fraction of the inorganic reflecting material in the composite reflecting layer is X;
the volume fraction of the inorganic reflecting material in the composite reflecting layer in the first bending area and the second bending area is Y;
wherein X > Y.
15. A display device comprising the display panel according to any one of claims 1 to 14.
16. The display device according to claim 15, wherein the display device is an in-vehicle display device,
the display device comprises a first display area and a second display area; a connecting line of the center of the first display area and the center of the steering wheel is approximately vertical to a plane where the first display area is located; the included angle between the connecting line of the center of the second display area and the center of the steering wheel and the plane where the second display area is located is 10-80 degrees;
in the first display area, the volume fraction of the inorganic reflective material in the composite reflective layer is P;
in the second display region, the volume fraction of the inorganic reflective material in the composite reflective layer is Q;
wherein P > Q.
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| CN110047903B (en) * | 2019-04-30 | 2022-04-15 | 京东方科技集团股份有限公司 | Display panel and method for manufacturing display panel |
| CN110289295B (en) * | 2019-06-27 | 2021-11-23 | 昆山国显光电有限公司 | Display panel and display device |
| CN110707233B (en) | 2019-09-16 | 2021-02-23 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
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| US6841932B2 (en) * | 2001-03-08 | 2005-01-11 | Xerox Corporation | Display devices with organic-metal mixed layer |
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| KR101947815B1 (en) * | 2012-08-07 | 2019-02-14 | 한국전자통신연구원 | The dual display device with the vertical structure |
| KR102460509B1 (en) * | 2015-10-06 | 2022-10-31 | 삼성디스플레이 주식회사 | Organic light emitting display device and method of manufacturing an organic light emitting display device |
| KR102632619B1 (en) * | 2015-11-23 | 2024-02-02 | 삼성디스플레이 주식회사 | Organic light-emitting display apparatus |
| CN106953020B (en) * | 2016-12-30 | 2020-02-07 | 上海天马有机发光显示技术有限公司 | Organic light-emitting display device and organic light-emitting display device |
| KR102737176B1 (en) * | 2017-01-31 | 2024-12-04 | 삼성디스플레이 주식회사 | Display substrate and display apparatus having the display substrate |
| CN107589594B (en) * | 2017-09-25 | 2021-01-26 | 京东方科技集团股份有限公司 | Adjustable reflection device, backlight module and display device |
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