CN114256432B - Display panel and display device - Google Patents
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- CN114256432B CN114256432B CN202111542114.5A CN202111542114A CN114256432B CN 114256432 B CN114256432 B CN 114256432B CN 202111542114 A CN202111542114 A CN 202111542114A CN 114256432 B CN114256432 B CN 114256432B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/17—Carrier injection layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/40—Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
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- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises a substrate base plate and a plurality of light-emitting devices, the light-emitting devices are positioned on one side of the substrate base plate, and the light-emitting devices comprise anodes and organic light-emitting layers which are arranged in a laminated manner; an organic functional layer located at one side of the organic light emitting layer facing the anode; the organic functional layer comprises a first organic functional part and a second organic functional part, and the first organic functional part at least partially overlaps with the organic light-emitting layer in the direction perpendicular to the plane of the substrate; in the first direction, the first organic functional portion is in contact with the second organic functional portion, and the material of the first organic functional portion is different from the material of the second organic functional portion, wherein the first direction intersects with the light emitting direction of the display panel. By arranging the material of the first organic functional part and the material of the second organic functional part to be different, the drift of carriers along the first direction is reduced, and the display effect is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and more particularly, to a display panel and a display device.
Background
With the development of OLED display technology, full-color OLED display is receiving increasing attention. At present, the structure and the design of an OLED device are formed by combining and superposing multiple layers of materials, and the brightness of a light-emitting layer of the structure of the OLED device is controlled by controlling the voltage and the current of a pixel circuit. However, the current OLED device structure cannot avoid a lateral leakage current between the sub-pixels, which may cause a sub-pixel to be stolen and bright, resulting in abnormal display caused by color crosstalk.
Therefore, how to avoid the problem of sub-pixel brightness, and improve the display effect of the display panel is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, embodiments of the present invention provide a display panel and a display device, in which the material of the first organic functional portion is different from the material of the second organic functional portion, so as to reduce carrier drift along the first direction and improve the display effect.
In one aspect, an embodiment of the present invention provides a display panel, including:
a substrate base;
a plurality of light emitting devices located at one side of the substrate base plate, the light emitting devices including an anode and an organic light emitting layer which are stacked;
an organic functional layer located at a side of the organic light emitting layer facing the anode;
the organic functional layer comprises a first organic functional part and a second organic functional part, and the first organic functional part at least partially overlaps with the organic light-emitting layer in the direction perpendicular to the plane of the substrate base plate;
in a first direction, the first organic functional portion is in contact with the second organic functional portion, and a material of the first organic functional portion is different from a material of the second organic functional portion;
the first direction intersects with the light emitting direction of the display panel.
In yet another aspect, an embodiment of the present invention provides a display apparatus, including any one of the display panels provided in the present application, based on the same inventive concept.
Compared with the related art, the display panel and the display device provided by the embodiment of the invention at least realize the following beneficial effects:
the display panel and the display device provided by the embodiment of the invention comprise a plurality of light emitting devices, the light emitting devices comprise anodes and organic light emitting layers which are arranged in a stacked mode, the organic light emitting layers are positioned on one side, facing the anodes, of the organic light emitting layers, the organic functional layers comprise first organic functional parts and second organic functional parts, the first organic functional parts and the organic light emitting layers are at least partially overlapped in the direction perpendicular to the plane of a substrate, the first organic functional parts are in contact with the second organic functional parts in the first direction, and the materials of the first organic functional parts and the materials of the second organic functional parts are different. And then can make the carrier pass through the organic luminescent layer of first organic functional portion and then corresponding luminescent device preferentially, reduce the carrier and transmit in first organic functional portion and second organic functional portion along the first direction, also can reduce the carrier and transversely leak the flow, and then effectively improve display panel's display effect.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic view of a display panel in the related art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken in the direction W-W' of FIG. 2;
FIG. 4 is a further cross-sectional view taken in the direction W-W' of FIG. 2;
FIG. 5 is a further cross-sectional view taken in the direction W-W' of FIG. 2;
FIG. 6 is a further cross-sectional view taken in the direction W-W' of FIG. 2;
FIG. 7 is a further cross-sectional view taken in the direction W-W' of FIG. 2;
FIG. 8 is a further cross-sectional view taken in the direction W-W' of FIG. 2;
FIG. 9 is a further cross-sectional view taken in the direction W-W' of FIG. 2;
FIG. 10 is a further cross-sectional view taken in the direction W-W' of FIG. 2;
FIG. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims (the claims) and their equivalents. The embodiments provided by the embodiments of the present invention may be combined with each other without contradiction.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The display panel of the related art is shown in fig. 1, and fig. 1 is a schematic structural diagram of the display panel of the related art. A related art provides a display panel 100, the display panel 100 including a substrate base 00 and a plurality of light emitting devices 01, the light emitting devices 01 may include an anode layer 02, a hole injection layer 03, a hole transport layer 04, a light emitting layer 05, an electron transport layer 06, an electron injection layer 07, and a cathode layer 08 stacked on the substrate base 01.
Since the hole injection layer 03 and the hole transport layer 04 are shared by the light emitting devices 01, when one light emitting device emits light, carriers in the hole injection layer 03 and the hole transport layer 04 are laterally transported to other surrounding light emitting devices, and further, the other light emitting devices are stolen to be bright, so that crosstalk of colors causes abnormal display, and display effect of the display panel 100 is affected.
In order to solve the technical problems, the invention provides a display panel and a display device. The embodiments of the display panel and the display device provided by the present invention will be described in detail below.
Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the invention, and fig. 3 is a cross-sectional view of the display panel in the W-W' direction in fig. 2. The display panel 200 includes: a substrate base 10; a plurality of light emitting devices 20, the light emitting devices 20 being located at one side of the substrate base 10, the light emitting devices 20 including an anode 21 and an organic light emitting layer 22 which are stacked; an organic functional layer 23, the organic functional layer 23 being located on a side of the organic light emitting layer 22 facing the anode 21; the organic functional layer 23 includes a first organic functional portion 231 and a second organic functional portion 232, the first organic functional portion 231 at least partially overlapping the organic light emitting layer 22 in a direction Y perpendicular to a plane in which the substrate base plate 10 is located; in the first direction X, the first organic functional portion 231 is in contact with the second organic functional portion 232, and the material of the first organic functional portion 231 is different from the material of the second organic functional portion 232; the first direction X intersects with the light emitting direction of the display panel.
It can be understood that, in the display panel 200 provided by the embodiment of the present invention, the light emitting devices 20 may include the anode 21 and the cathode 24 opposite to the anode 21, when controlling the light emission of a certain light emitting device 20, the carriers, such as holes, flow from the anode 21 to the cathode 24 sequentially through the first organic functional portion 231 and the organic light emitting layer 22, and the material of the first organic functional portion 231 is different from the material of the second organic functional portion 232, so that the first organic functional portion 231 can make the carriers enter the organic light emitting layer 22 of the corresponding light emitting device 20 preferentially through the first organic functional portion 231, and the second organic functional portion 231 blocks the carriers from flowing from one light emitting device 20a to the surrounding light emitting device 20b, so that the adjacent other light emitting devices 20b can be prevented from emitting light, that is, the lateral leakage of the carriers is reduced, and the display effect of the display panel 200 is effectively improved.
In fig. 3, only the organic light emitting layer 22 covers the first organic functional portion 231 along the direction Y perpendicular to the substrate 10, so that the contact area between the organic light emitting layer 22 and the first organic functional portion 231 can be maximized, the number of carriers injected into the corresponding organic light emitting layer 22 is increased, and the effect of improving the light emitting efficiency of the corresponding organic light emitting layer 22 is achieved. However, the present invention does not limit the area where the first organic functional portion 231 overlaps the organic light emitting layer 22 in the direction Y perpendicular to the plane in which the substrate base 10 is located, as long as it is ensured that the first organic functional portion 231 overlaps at least a portion of the organic light emitting layer 22 so that carriers can enter the organic light emitting layer 22 of the corresponding light emitting device 20 through the first organic functional portion 231. In the technical solution provided by the embodiment of the present invention, the light emitting direction of the display panel may be a thickness direction of the display panel. It should be noted that the display panel 200 may further include a pixel circuit electrically connected to the light emitting device 20 to drive the light emitting device to emit light and turn off.
In some alternative embodiments, continuing to refer to fig. 3, the display panel 200 provided in the embodiment of the present invention has a mobility of carriers in the first organic functional portion 231 of V1 and a mobility of carriers in the second organic functional portion 232 of V2, where V1 > V2.
It can be appreciated that, in the display panel 200 provided in the embodiment of the present invention, on the basis that the material of the first organic functional portion 231 is different from the material of the second organic functional portion 232, the mobility V1 of the carriers in the first organic functional portion 231 is set to be greater than the mobility V2 of the carriers in the second organic functional portion 232, the second organic functional portion 232 with lower mobility is set to be in contact with the first organic functional portion 231 with higher mobility in the first direction X, and the second organic functional portion 232 can avoid the carriers between the adjacent light emitting devices 20 from being transmitted along the first direction X, so as to avoid the phenomenon that the adjacent light emitting devices 20b are stolen when one light emitting device 20a is turned on; since the second organic functional portion 232 reduces the number of carriers laterally transferred, and thus the partial carriers are transferred to the organic light emitting layer 22 in the direction Y, an effect of improving the light emitting efficiency of the light emitting device 20 can also be achieved, and the first organic functional portion 231 having a higher mobility is disposed between the anode 21 and the organic light emitting layer 22, so that the carriers can preferentially enter the organic light emitting layer 22 of the corresponding light emitting device 20 through the first organic functional portion 231, and an effect of further improving the light emitting efficiency of the light emitting device 20 can be achieved.
The specific values of the mobility V1 of the carriers in the first organic functional portion 231 and the mobility V2 of the carriers in the second organic functional portion 232 are not limited in the present invention, so long as V1 > V2 is ensured, and the second organic functional portion 232 can play a role in reducing the lateral transport of the carriers.
In some alternative implementations, with continued reference to fig. 3, the display panel 200 provided in the embodiment of the present invention:
it can be appreciated that the display panel 200 according to the embodiment of the present invention defines that the mobility V1 of the carriers in the first organic functional portion 231 is greater than the mobility V2 of the carriers in the second organic functional portion 232The mobility V1 of the carriers in the first organic functional portion 231 and the mobility V2 of the carriers in the second organic functional portion 232 are set to have a magnitude difference, and thus the effect of preventing the carriers from being laterally transferred can be effectively achieved in the low mobility second organic functional portion 232. And compared with some ways of changing the transmission capability by adopting the doping form, as time goes by, the doped element has a certain migration, so that the problem of influencing the injection of the carriers in the undoped region is caused, and the display panel 200 of the embodiment of the invention is provided with the first organic functional portion 231, wherein the migration rate V1 of the carriers in the first organic functional portion 232 and the migration rate V2 of the carriers in the second organic functional portion 232 have magnitude difference, so that the first organic function can be ensuredThe mobility of the portion 231 and the second organic functional portion 232 does not significantly change with time, so that the stability of the mobility of the first organic functional portion 231 and the second organic functional portion 232 is improved, and the display effect of the display panel 200 is ensured.
In some alternative embodiments, as shown in connection with fig. 4 and 5, fig. 4 is a further cross-sectional view taken along the direction W-W 'in fig. 2, and fig. 5 is a further cross-sectional view taken along the direction W-W' in fig. 2. The display panel 200 provided in the embodiment of the invention: the first organic functional portion 231 includes a first hole injection layer HIL1, and the second organic functional portion 232 includes a second hole injection layer HIL2; alternatively, the first organic functional portion 231 includes a first hole transport layer HTL1, and the second organic functional portion 232 includes a second hole transport layer HTL2.
It can be understood that the structures of the first organic functional portion 231 and the second organic functional portion 232 in the display panel 200 provided by the embodiment of the present invention may include the following ways:
first kind: continuing with fig. 4, fig. 4 only illustrates that the first organic functional portion 231 includes only the first hole injection layer HIL1, and the second organic functional portion 232 includes the second hole injection layer HIL2. The first hole injection layer HIL1 is located between the organic light emitting layer 22 and the anode 21, and the first hole injection layer HIL1 can minimize the energy level barrier spanned during hole transition in the anode 21, thereby increasing hole injection and transport capacity, and can enable more holes to be injected into the organic light emitting layer 22, thereby improving the recombination efficiency and achieving the effect of improving the light emitting efficiency of the light emitting device 20. The second organic functional portion 232 may be provided to have the same function as the first organic functional portion 231, that is, the second organic functional portion 232 includes the second hole injection layer HIL2, the hole mobility in the second hole injection layer HIL2 is set to be smaller than the hole mobility in the first hole injection layer HIL1, and the second hole injection layer HIL2 with low mobility prevents carriers between adjacent light emitting devices 20 from being transmitted along the first direction X, so that when one light emitting device 20a is turned on, a phenomenon of being turned on by being stolen by the light emitting device 20b adjacent thereto is avoided, and the display effect of the display panel 200 is improved.
Second kind: continuing with fig. 5, fig. 5 illustrates only that the first organic functional portion 231 includes only the first hole transport layer HTL1, and the second organic functional portion 232 includes the second hole transport layer HTL2. The first hole transport layer HTL1 is disposed between the organic light emitting layer 22 and the anode 21, and the first hole transport layer HTL1 can enhance hole injection and transport capability of the anode 21, so that the concentration of holes injected into the corresponding light emitting device 20 is increased, thereby achieving the effect of improving the recombination efficiency and the light emitting efficiency of the light emitting device 20. The second organic functional portion 232 may be provided to have the same function as the first organic functional portion 231, that is, the second organic functional portion 232 may include the second hole transport layer HTL2, the hole mobility in the second hole transport layer HTL2 is set to be smaller than the hole mobility in the first hole transport layer HTL1, and the second hole transport layer HTL2 with low mobility may prevent carriers between adjacent light emitting devices 20 from being transported in the first direction X, thereby preventing the light emitting device 20b adjacent to the second organic functional portion from being stolen when one light emitting device 20a is turned on, and improving the display effect of the display panel 200.
The structures of the first organic functional portion 231 and the second organic functional portion 232 are not particularly limited, and may be provided as a hole transport layer or a hole injection layer according to actual situations, as long as the mobility V1 of carriers in the first organic functional portion 231 is ensured to be greater than the mobility V2 of carriers in the second organic functional portion 232.
In some alternative embodiments, as shown in connection with fig. 6-8, fig. 6 is a further cross-sectional view taken along the direction W-W ' in fig. 2, fig. 7 is a further cross-sectional view taken along the direction W-W ' in fig. 2, and fig. 8 is a further cross-sectional view taken along the direction W-W ' in fig. 2. The first organic functional part 231 includes a first hole injection layer HIL1 and a first hole transport layer HTL1 stacked; the second organic functional portion 232 includes a second hole injection layer HIL2; alternatively, the second organic functional portion 232 includes a second hole transport layer HTL2; alternatively, the second organic functional portion 232 includes a second hole injection layer HIL2 and a second hole transport layer HTL2, the second hole transport layer HTL2 and the first hole transport layer HTL1 are in contact, and the second hole injection layer HIL2 and the first hole injection layer HIL1 are in contact in the first direction X.
It can be understood that the structures of the first organic functional portion 231 and the second organic functional portion 232 in the display panel 200 provided by the embodiment of the present invention may include the following ways:
first kind: as further shown in fig. 6, fig. 6 only illustrates that the first organic functional portion 231 includes a first hole injection layer HIL1 and a first hole transport layer HTL1 stacked, and the second organic functional portion 232 includes a second hole injection layer HIL2, and the second hole injection layer HIL2 and the first hole transport layer HTL1 are in contact in the first direction X. On the basis that the first organic functional portion 231 includes a stacked first hole injection layer HIL1 and first hole transport layer HTL1 in a double-layer structure, the second organic functional portion 232 may be configured to include only the second hole injection layer HIL2, where the hole mobility of the second hole injection layer HIL2 is smaller than the hole mobility of the first hole injection layer HIL1 and the first hole transport layer HTL1, so long as the second hole injection layer HIL2 is configured to contact the first hole injection layer HIL1 and/or the first hole transport layer HTL1 in the first direction X, it is sufficient to ensure that the second hole injection layer HIL2 can block the hole from migrating laterally, thereby avoiding the problem of light-stealing and improving the display effect of the display panel 200.
Second kind: continuing with fig. 7, fig. 7 only illustrates that the first organic functional portion 231 includes a first hole injection layer HIL1 and a first hole transport layer HTL1 stacked, and the second organic functional portion 232 includes a second hole transport layer HTL2, and the second hole transport layer HTL2 and the first hole transport layer HTL1 are in contact in the first direction X. On the basis that the first organic functional portion 231 includes a stacked double-layer structure of the first hole injection layer HIL1 and the first hole transport layer HTL1, it may be provided that the second organic functional portion 232 includes only the second hole transport layer HTL2, and the hole mobility of the second hole transport layer HTL2 is smaller than the hole mobility of the first hole injection layer HIL1 and the hole mobility of the first hole transport layer HTL1, so long as the second hole transport layer HTL2 is in contact with the first hole injection layer HIL1 and/or the first hole transport layer HTL1 along the first direction X, it is sufficient to ensure that the second hole injection layer HIL2 can block the hole lateral migration, avoid the problem of light-stealing, and improve the display effect of the display panel 200.
Third kind: continuing with fig. 8, fig. 8 only illustrates that the first organic functional portion 231 includes a first hole injection layer HIL1 and a first hole transport layer HTL1 stacked, and the second organic functional portion 232 includes a second hole injection layer HIL2 and a second hole transport layer HTL2, and the second hole transport layer HTL2 and the first hole transport layer HTL1 are in contact, and the second hole injection layer HIL2 and the first hole injection layer HIL1 are in contact, in the first direction X. Setting the first organic functional portion 231 and the second organic functional portion 232 to each include a double-layer hole transport layer and a hole injection layer, it is possible to set the hole mobility of the second hole injection layer HIL2 and the hole mobility of the second hole transport layer HTL2 to be smaller than the hole mobility of the first hole injection layer HIL1 and the hole mobility of the first hole transport layer HTL1, or the hole mobility of the second hole injection layer HIL2 to be smaller than the hole mobility of the first hole injection layer HIL1, and the hole mobility of the second hole transport layer HTL2 to be smaller than the hole transport layer HTL1, that is, to ensure that the second organic functional portion 232 can block the hole from migrating laterally, to avoid the problem of lighting, and to improve the display effect of the display panel 200.
In some alternative embodiments, as shown in connection with fig. 9, fig. 9 is yet another cross-sectional view taken along the direction W-W' in fig. 2. The display panel 200 provided in the embodiment of the invention: the light emitting device 20 includes any one of a first color light emitting device R, a second color light emitting device G, and a third color light emitting device B.
It can be appreciated that the display panel 200 provided in the embodiment of the present invention may include a plurality of first color light emitting devices R, second color light emitting devices G and third color light emitting devices B, and the light emitting devices 20 include one or more of the first color light emitting devices R, the second color light emitting devices G and the third color light emitting devices B, that is, the first organic functional portion 231 and the second organic functional portion 232 in the light emitting devices 20 of any color may be disposed to be in contact, that is, the second organic functional portion 232 may be disposed only in the gap between the light emitting devices 20 of one color, that is, the second organic functional portion 232 may be filled only around the light emitting devices 20 (for example, blue light emitting devices) that are easy to be stolen, and the process may be simplified without disposing the second organic functional portion 232 between the light emitting devices 20 of each color.
In some alternative implementations, with continued reference to fig. 2 and 3, the display panel 200 provided by the embodiment of the present invention: also included is a pixel defining layer 30, the pixel defining layer 30 including a plurality of pixel opening regions 31 and pixel spacing regions 32; in the direction Y perpendicular to the plane of the substrate base 10, the organic light emitting layer 22 overlaps the pixel opening region 31, and the second organic functional portion 232 includes a first sub-organic functional portion 232a, the first sub-organic functional portion 232a being covered by the pixel interval region 32.
It can be understood that the display panel 200 provided in this embodiment of the present invention further includes a pixel definition layer, where the first organic functional portion 231 is disposed at the position of the pixel opening area 31, and the second organic functional portion 232 is disposed at the position of the pixel spacing area 32, so that not only can the first organic functional portion 231 be preferentially enabled to enter the organic light-emitting layer 22 of the corresponding light-emitting device 20, and the light-emitting efficiency of the light-emitting device 20 be improved, but also the number of laterally transmitted carriers can be reduced by the second organic functional portion 232, so that the problem that when one pixel is lighted, the adjacent pixel is stolen, and the display effect of the display panel 200 is improved.
In some alternative embodiments, as shown in fig. 2 and 10, fig. 10 is a further cross-sectional view along W-W' in fig. 2, and a display panel 200 is provided in an embodiment of the present invention: the first organic functional portion 231 includes a plurality of second sub organic functional portions 231a, and the second organic functional portion 232 further includes a third sub organic functional portion 232b, the third sub organic functional portion 232b being located between two adjacent second sub organic functional portions 231 a.
It can be appreciated that, in the display panel 200 provided in the embodiment of the present invention, on the basis of disposing the second organic functional portion 232 (the first sub-organic functional portion 232 a) at the corresponding position of the pixel spacing region 32, a portion of the second organic functional portion 232 (the third sub-organic functional portion 232 b) is disposed in the pixel opening region 31, that is, the third sub-organic functional portion 232b is disposed between two adjacent second sub-organic functional portions 231a, and by disposing the second organic functional portion 232 in the pixel opening region 31 at the same time, the lateral transmission of carriers can be further blocked, so that the problem of lighting of adjacent pixels is avoided, and the display effect of the display panel 200 is improved. In the present invention, the area of orthographic projection of the third sub-organic functional portion 232b on the plane of the substrate 10 and the area of orthographic projection of the second sub-organic functional portion 231a on the plane of the substrate 10 are not limited, and the area of orthographic projection of the third sub-organic functional portion 232b on the plane of the substrate 10 may be smaller than the area of orthographic projection of the second sub-organic functional portion 231a on the plane of the substrate 10, so as to avoid influencing the effect of carrier transmission to the organic light emitting layer 22.
In fig. 10, only one third sub-organic functional portion 232b is provided in the pixel opening region 31, and two second sub-organic functional portions 231a are taken as an example, but the present invention is not limited thereto, and the third sub-organic functional portion 232b may be provided between two adjacent second sub-organic functional portions 231 a.
In some alternative embodiments, as further shown in fig. 10, in the display panel 200 provided by the embodiment of the present invention, in the direction Y perpendicular to the plane of the substrate 10, the thickness d1 of the first organic functional portion 231 is equal to the thickness d2 of the second organic functional portion 232.
It can be understood that, in the display panel 200 provided in the embodiment of the present invention, whether the first organic functional portion 231 and the second organic functional portion 232 have a single-layer structure or a double-layer structure, the thickness of the first organic functional portion 231 is equal to the thickness of the second organic functional portion 232 in the direction Y perpendicular to the plane of the substrate 10. Here, when both the first and second organic functional portions 231 and 232 are of a double-layer structure, it may be defined that the thickness of the first hole injection layer HIL1 is equal to the thickness of the second hole injection layer HIL2, and the thickness of the first hole transport layer HTL1 is equal to the thickness of the second hole transport layer HIL2, but not limited thereto, the thickness of the first hole injection layer HIL1 may be set to be greater than the thickness of the second hole injection layer HIL2, the thickness of the first hole transport layer HTL1 may be set to be smaller than the thickness of the second hole transport layer HIL2, or the thickness of the first hole transport layer HIL1 may be set to be smaller than the thickness of the second hole injection layer HIL2, based on the thickness of the first organic functional portion 231 being equal to the thickness of the second organic functional portion 232. The thicknesses of the specific film structures in the first organic functional portion 231 and the second organic functional portion 232 may be set according to actual requirements, as long as the thickness of the first organic functional portion 231 is ensured to be equal to the thickness of the second organic functional portion 232. Continuing with fig. 10, in fig. 10, only taking the case that the thickness d2 of the third sub-organic functional portion 232b disposed in the pixel opening area 31 is equal to the thickness d1 of the second sub-organic functional portion 231a, and the thickness d1 of the first organic functional portion 231 is equal to the thickness d2 of the second organic functional portion 232 in the direction Y perpendicular to the plane of the substrate 10, it is ensured that the thicknesses of the positions of the organic functional layers 23 remain consistent, so that the organic functional layer 22 can be conveniently manufactured, and the subsequent organic light emitting layer 22 can be conveniently manufactured on the organic functional layer 22, thereby simplifying the process difficulty of the display panel.
In some alternative embodiments, as shown in fig. 11, fig. 11 is a schematic structural diagram of another display panel according to an embodiment of the present invention. In the display panel 200 provided in the embodiment of the present invention, on the basis that the first sub-organic functional portion 232a is covered by the pixel spacing region 32, the orthographic projection of the pixel opening region 31 on the plane where the substrate 10 is located may have a circular, oval, diamond, quadrilateral, pentagonal, hexagonal structure, etc.; it can be understood that the first sub-organic functional portion 232a is disposed around the pixel opening area 31, and further, the shape of the first sub-organic functional portion 232a is matched with the shape of the pixel opening area 31, so that the sub-pixel structure raised against the corners can also be perfectly corresponding, and the layout of the display panel 200 is beautified.
In fig. 2, only the shape of the orthographic projection of the pixel opening area 31 on the plane of the substrate 10 is taken as an example, and fig. 11 only the shape of the orthographic projection of the pixel opening area 31 on the plane of the substrate 10 is taken as an example, and the structure of the first sub-organic functional portion 232a is clearly illustrated, so that in fig. 11, only the structures of the first sub-organic functional portion 232a and the pixel opening area 31 are illustrated, and since the organic light emitting layer 22 is located in the pixel opening area 31, the filling pattern of the pixel opening area 31 is the same as the filling pattern of the organic light emitting layer 22, and the structure can be applied to other film layers as illustrated by referring to the cross-sectional views.
In some alternative embodiments, with continued reference to FIG. 3, the display panel 200 provided in the example of the present invention includes a material of the first organic functional portion 231 including N, N ' -diphenyl-N, N ' -bis (3-methylphenyl) -1,1' -biphenyl-4, 4' -diamine, or 4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ]; the material of the second organic functional portion 232 includes 4,4',4″ -tris (N-3-methylphenyl-N-phenylamino) -triphenylamine, or m-methylbenzotriazole.
It can be understood that in the display panel 200 according to the embodiment of the present invention, when the material of the first organic functional portion 231 is N, N '-diphenyl-N, N' -bis (3-methylphenyl) -1,1 '-biphenyl-4, 4' -diamine, the carrier mobility of the first organic functional portion 231 is 1.0x10ζ -3cm 2 Vs, when the material of the first organic functional portion 231 is 4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline]At this time, the carrier mobility of the first organic functional portion 231 is 1.0X10-2 cm 2 Vs; when the material of the second organic functional portion 232 is 4,4' -tris (N-3-methylphenyl-N-phenylamino) -triphenylamine, the carrier mobility of the second organic functional portion 232 is 3.0X10-5 cm 2 When the material of the second organic functional portion 232 is m-methylbenzotriazole, the carrier mobility of the second organic functional portion 232 is 2.3X10-5 cm 2 Vs. The ratio of the first organic functional portion 231 to the second organic functional portion 232 can be ensured to be 100 times or more, no matter the material of the first organic functional portion 231 and the second organic functional portion 232 is any one of the above, so that the mobility V1 of the carriers in the first organic functional portion 231 and the mobility V2 of the carriers in the second organic functional portion 232 have a magnitude difference, and further the effect of preventing the carriers from being laterally transferred can be effectively achieved in the low mobility second organic functional portion 232. The materials of the first organic functional portion 231 and the second organic functional portion 232 are all exemplified, but not limited thereto, and materials satisfying the mobility relationship between the first organic functional portion 231 and the second organic functional portion 232 are all within the scope of the present invention.
The present invention also provides a display device 300 including the display panel 200 according to any one of the above embodiments of the present invention. Referring to fig. 12, fig. 12 is a schematic diagram of a display device according to an embodiment of the present invention, and a display device 300 includes a display panel 200 according to any one of the above embodiments of the present invention. The embodiment of fig. 12 is only taken as an example of a mobile phone to describe the display device 300, and it is to be understood that the display device 300 provided in the embodiment of the present invention may be a computer, a television, a vehicle-mounted display device, a wearable device, or other display devices with display functions, which is not particularly limited in the present invention. The display device 300 provided in the embodiment of the present invention has the beneficial effects of the display panel 200 provided in the embodiment of the present invention, and the embodiments of the present invention are not described herein again with reference to the specific description of the display device in the above embodiments.
As can be seen from the foregoing embodiments, the display panel and the display device provided by the embodiments of the present invention at least achieve the following beneficial effects:
the display panel and the display device provided by the embodiment of the invention comprise a plurality of light emitting devices, the light emitting devices comprise anodes and organic light emitting layers which are arranged in a stacked mode, the organic light emitting layers are positioned on one side, facing the anodes, of the organic light emitting layers, the organic functional layers comprise first organic functional parts and second organic functional parts, the first organic functional parts and the organic light emitting layers are at least partially overlapped in the direction perpendicular to the plane of a substrate, the first organic functional parts are in contact with the second organic functional parts in the first direction, and the materials of the first organic functional parts and the materials of the second organic functional parts are different. And then can make the carrier pass through the organic luminescent layer of first organic functional portion and then corresponding luminescent device preferentially, reduce the carrier and transmit in first organic functional portion and second organic functional portion along the first direction, also can reduce the carrier and transversely leak the flow, and then effectively improve display panel's display effect.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A display panel, comprising:
a substrate base;
a plurality of light emitting devices located at one side of the substrate base plate, the light emitting devices including an anode and an organic light emitting layer which are stacked;
an organic functional layer located at a side of the organic light emitting layer facing the anode;
the organic functional layer comprises a first organic functional part and a second organic functional part, and the first organic functional part at least partially overlaps with the organic light-emitting layer in the direction perpendicular to the plane of the substrate base plate;
in a first direction, the first organic functional portion is in contact with the second organic functional portion, and a material of the first organic functional portion is different from a material of the second organic functional portion;
wherein the first direction intersects with the light-emitting direction of the display panel;
the mobility of the carriers in the first organic functional part is V1, and the mobility of the carriers in the second organic functional part is V2, wherein V1 is more than V2.
2. The display panel of claim 1, wherein the display panel comprises,n＞2。
3. the display panel according to claim 1, wherein the first organic functional portion includes a first hole injection layer, and the second organic functional portion includes a second hole injection layer;
alternatively, the first organic functional portion includes a first hole transport layer, and the second organic functional portion includes a second hole transport layer.
4. The display panel according to claim 1, wherein the first organic functional portion includes a first hole injection layer and a first hole transport layer stacked;
the second organic functional portion includes a second hole injection layer;
alternatively, the second organic functional portion includes a second hole transport layer;
alternatively, the second organic functional portion includes a second hole injection layer and a second hole transport layer, the second hole transport layer being in contact with the first hole transport layer and the second hole injection layer being in contact with the first hole injection layer in the first direction.
5. The display panel of claim 1, wherein the light emitting devices comprise one or more of a first color light emitting device, a second color light emitting device, and a third color light emitting device.
6. The display panel of claim 1, further comprising a pixel definition layer comprising a plurality of pixel opening regions and pixel spacing regions;
the organic light emitting layer overlaps the pixel opening region in a direction perpendicular to a plane of the substrate, and the second organic functional portion includes a first sub-organic functional portion covered by the pixel spacer.
7. The display panel of claim 6, wherein the display panel comprises,
the first organic functional part comprises a plurality of second sub-organic functional parts, the second organic functional parts further comprise third sub-organic functional parts, and the third sub-organic functional parts are positioned between two adjacent second sub-organic functional parts.
8. The display panel according to claim 1, wherein a thickness of the first organic functional portion is equal to a thickness of the second organic functional portion in a direction perpendicular to a plane in which the substrate base plate is located.
9. The display panel according to claim 1, wherein the material of the first organic functional portion includes N, N ' -diphenyl-N, N ' -bis (3-methylphenyl) -1,1' -biphenyl-4, 4' -diamine, or 4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ];
the material of the second organic functional part comprises 4,4' -tris (N-3-methylphenyl-N-phenylamino) -triphenylamine, or m-methylbenzotriazole.
10. A display device comprising the display panel according to any one of claims 1 to 9.
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