CN109148708B - Display panel and display device - Google Patents
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- CN109148708B CN109148708B CN201811004573.6A CN201811004573A CN109148708B CN 109148708 B CN109148708 B CN 109148708B CN 201811004573 A CN201811004573 A CN 201811004573A CN 109148708 B CN109148708 B CN 109148708B
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/80—Constructional details
- H10K30/865—Intermediate layers comprising a mixture of materials of the adjoining active layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
The embodiment of the invention discloses a display panel and a display device. The display panel comprises a substrate base plate, wherein a plurality of driving elements are arranged on the substrate base plate; an organic light emitting device disposed corresponding to the driving element, the organic light emitting device including an anode and a cathode, and an organic functional layer between the anode and the cathode; a planar layer between the anode and the substrate base plate; the anode comprises a first conducting layer and a reflecting layer located on one side, facing the substrate, of the first conducting layer, and further comprises a transition layer located between the first conducting layer and the flat layer, wherein the transition layer comprises an organic material. According to the embodiment of the invention, the transition layer is arranged between the first conducting layer and the flat layer, and the transition layer and the reflecting layer have better compatibility, so that particles or bulges can be effectively prevented from appearing on the reflecting layer, the square resistance of the anode is effectively reduced, the power consumption of the organic light-emitting device is reduced, and the performance of the display panel is improved.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a display panel and a display device.
Background
The Organic Light-Emitting Diode (OLED) display technology has the advantages of self-luminescence, wide viewing angle, almost infinite contrast, low power consumption, extremely high response speed, and the like, and is widely applied to various display fields such as mobile phones, digital video cameras, Personal Digital Assistants (PDAs), notebook computers, car audio, televisions, and the like.
In the prior art, an OLED generally comprises a cathode, an electron transport layer, a light emitting layer, a hole transport layer, an anode, and a substrate. When the organic light emitting diode works, a bias voltage is applied between an anode and a cathode of the OLED, holes and electrons respectively migrate from a hole transport layer and an electron transport layer to a light emitting layer, the electrons and the holes are recombined on the light emitting layer to generate excitons, the excitons are unstable, energy is released, and the energy is transferred to molecules of an organic light emitting substance in the light emitting layer to enable the molecules to jump from a ground state to an excited state. The excited state is unstable, and excited molecules return to the ground state from the excited state, and radiation transitions to produce a light emission phenomenon. The common OLED anode structure is a laminated structure of a transparent electrode/silver/transparent electrode, and when silver is deposited on the transparent electrode by using a deposition process, silver particles or protrusions appear, so that the square resistance of the anode is large, and the power consumption of an OLED device is large.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for reducing the square resistance of an anode and effectively reducing the power consumption of an OLED device.
In a first aspect, an embodiment of the present invention provides a display panel, including:
the driving device comprises a substrate base plate, a driving circuit and a driving circuit, wherein a plurality of driving elements are arranged on the substrate base plate;
an organic light emitting device disposed corresponding to the driving element, the organic light emitting device including an anode and a cathode, and an organic functional layer between the anode and the cathode;
a planar layer between the anode and the substrate base plate; wherein,
the anode comprises a first conducting layer and a reflecting layer positioned on one side of the first conducting layer facing the substrate, and further comprises a transition layer, wherein the transition layer is positioned between the first conducting layer and the flat layer, and comprises an organic material.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel described above.
The embodiment of the invention provides a display panel, which comprises a substrate base plate, wherein a plurality of driving elements are arranged on the substrate base plate; an organic light emitting device disposed corresponding to the driving element, the organic light emitting device including an anode and a cathode, and an organic functional layer between the anode and the cathode; a planar layer between the anode and the substrate base plate; the anode comprises a first conducting layer and a reflecting layer located on one side, facing the substrate, of the first conducting layer, and further comprises a transition layer located between the first conducting layer and the flat layer, wherein the transition layer comprises an organic material. Through set up the transition layer between first conducting layer and planarization layer, transition layer and reflection stratum have better compatibility, can prevent effectively that granule or arch from appearing in the reflection stratum, effectively reduce anode sheet resistance, reduce organic light emitting device's consumption, improve display panel's performance.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
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. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above-described terms in the present invention can be understood in specific cases by those skilled in the art.
An embodiment of the present invention provides a display panel, including: the substrate comprises a substrate base plate, wherein a plurality of driving elements are arranged on the substrate base plate; an organic light emitting device disposed corresponding to the driving element, the organic light emitting device including an anode and a cathode, and an organic functional layer between the anode and the cathode; a planar layer between the anode and the substrate base plate; the anode comprises a first conducting layer and a reflecting layer located on one side, facing the substrate, of the first conducting layer, and further comprises a transition layer located between the first conducting layer and the flat layer, wherein the transition layer comprises an organic material.
It can be understood that the substrate in the embodiment of the present invention may be a flexible substrate, and the corresponding display panel may be a flexible display panel, and the flexible display panel has the performance of low power consumption, being bendable, and the like, and is suitable for various display devices, especially for wearable display devices. Optionally, the flexible substrate may be made of polyester imide or polyethylene terephthalate resin. In addition, the substrate base plate can also be a rigid base plate, and the corresponding display panel is a rigid display panel. The embodiment of the invention does not particularly limit the material of the display panel.
The driving element comprises a plurality of film layer structures, and the flat layer is used for flattening the surface of the driving element so as to be beneficial to forming the structure of the organic light-emitting device. The reflecting layer is used for reflecting light rays emitted by the organic functional layer, and the light rays are emitted after passing through the organic functional layer and the cathode, so that the light emitting efficiency of the organic light emitting device is enhanced. However, in the prior art, the reflective layer is easy to form particles or bulges, which causes the black spot phenomenon of the organic light-emitting device and increases the square resistance of the anode. The transition layer comprises an organic material with good compatibility with the reflecting layer, so that the reflecting layer has good film-forming property, particles or protrusions can be effectively prevented from appearing on the reflecting layer, the black spot phenomenon is effectively avoided, the square resistance of the anode is reduced, and the performance of the organic light-emitting device is improved. The transition layer can be positioned between the reflecting layer and the flat layer, and also can be positioned between the first conducting layer and the reflecting layer.
According to the display panel provided by the embodiment of the invention, the transition layer is arranged between the first conducting layer and the flat layer, and the transition layer and the reflecting layer have good compatibility, so that particles or bulges can be effectively prevented from appearing on the reflecting layer, the square resistance of the anode is effectively reduced, the power consumption of the organic light-emitting device is reduced, and the performance of the display panel is improved.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention. Referring to fig. 1, the display panel includes a substrate base 10, on which a plurality of driving elements (not shown in the figure) are disposed on the substrate base 10; an organic light emitting device 20 disposed corresponding to the driving element, the organic light emitting device 20 including an anode 21 and a cathode 23, and an organic functional layer 22 between the anode 21 and the cathode 23; a flat layer 30, the flat layer 30 being located between the anode 21 and the base substrate 10; wherein the anode 21 comprises a first conductive layer 211 and a reflective layer 212 located on a side of the first conductive layer 211 facing the substrate 10, the anode 21 further comprises a transition layer 213, the transition layer 213 is located between the first conductive layer 211 and the planarization layer 30, and the transition layer 213 comprises an organic material. Optionally, a transition layer 213 is located between the reflective layer 212 and the planarization layer 30. Optionally, transition layer 213 is disposed on planarization layer 30.
By arranging the transition layer 213 on the planarization layer 30, the reflective layer 212 can be prevented from particle aggregation, and the transition layer 213 and the reflective layer 212 have good compatibility, so that the problem that the reflective layer 212 is easy to fall off due to direct contact with the planarization layer 30 can be avoided, and the service life of the organic light emitting device 20 can be prolonged.
Fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 2, optionally, the driving element includes a first thin film transistor 40, a drain electrode 44 of the first thin film transistor 40 is connected to the anode 21 through a via hole, and the reflective layer 212 extends to the via hole and contacts the drain electrode 44.
Exemplarily, fig. 2 shows only one first thin film transistor 40, the first thin film transistor 40 includes a polysilicon active layer 41, a gate electrode 42, a source electrode 43, and a drain electrode 44, the source electrode 43 and the drain electrode 44 are electrically connected to the polysilicon active layer 41 through a via hole, the gate electrode 42 is electrically connected to a gate line, the source electrode 43 is electrically connected to a data line, and the drain electrode 44 is electrically connected to the anode 21 through a via hole; the gate line and the gate electrode 42 may be formed by the same process, and the data line and the source or drain electrode 43 or 44 may be formed by the same process. The display panel further includes a buffer layer 101, a gate insulating layer 102, and an interlayer insulating layer 103 on the base substrate 10. The buffer layer 101 is located on the surface of one side of the substrate base plate 10, the gate electrode 42 is located on the surface of one side of the buffer layer 101 away from the substrate base plate 10, the gate insulating layer 102 covers the polysilicon active layer 41 and is located between the gate electrode 42 and the polysilicon active layer 41, the interlayer insulating layer 103 covers the gate electrode 42 and is located between the film layer where the source electrode 43 is located and the gate insulating layer 102, the flat layer 30 covers the source electrode 43, the drain electrode 44 and the interlayer insulating layer 103, the organic light emitting device 20 is located on one side of the flat layer 30 away from the substrate base plate 10, because the flat layer 30 is not conductive, the transition layer 213 is not conductive or has poor conductivity, the flat layer 30 and the transition layer 213 are provided with via holes, and the.
Fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 3, optionally, a transition layer 213 is positioned between the first conductive layer 211 and the reflective layer 212.
The transition layer 213 may also be disposed between the first conductive layer 211 and the reflective layer 212 to prevent the reflective layer 212 from generating particles or protrusions, thereby effectively avoiding the occurrence of black spots, reducing the sheet resistance of the anode 21, and improving the performance of the organic light emitting device.
Fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 4, the transition layer 213 is disposed between the first conductive layer 211 and the reflective layer 212, and the reflective layer 212 is electrically connected to the drain 44 of the first thin film transistor 40 through a via hole on the planarization layer 30.
Fig. 5 and fig. 6 are schematic structural diagrams of another display panel according to an embodiment of the present invention. Referring to fig. 5 and 6, optionally, a second conductive layer 214 is further disposed between the transition layer 213 and the planarization layer 30.
By disposing the second conductive layer 214 on the planarization layer 30, the second conductive layer 214 may be a metal oxide, such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), for example. Because ITO or IZO is generally formed by evaporation, it has good film-forming property, and is easily combined with the transition layer 213 or the reflective layer 212, and the addition of the second conductive layer 214 can provide more holes, increase the hole injection efficiency of the anode 21, and improve the performance of the organic light-emitting device 20.
Optionally, the highest occupied orbital level HOMO1 of the transition layer 212 and the work function of the reflective layer
Satisfies the following conditions:
it can be appreciated that by setting the highest occupied orbital level HOMO1 of the transition layer 212 and the work function of the reflective layer
Satisfies the following conditions:
which is beneficial to hole injection and improves the performance of the organic light emitting device 20.
Optionally, the highest occupied orbital level HOMO1 of the transition layer 212 and the work function of the second conductive layer 214
Satisfies the following conditions:
it can be appreciated that by setting the highest occupied orbital level HOMO1 of the transition layer 212 and the work function of the second conductive layer 214
Satisfies the following conditions:
the transition layer 213, the reflective layer 212 and the second conductive layer 214 can be matched with a reasonable energy level difference, which is beneficial to injecting holes and improving the performance of the organic light-emitting device 20.
Optionally, the organic material comprises at least one of an oxazole derivative or a metal chelate.
The transition layer may be an organic compound including an oxazole derivative or a metal chelate, and one organic compound may be used or a mixture of a plurality of organic compounds may be used. The organic compound containing the oxazole derivative or the metal chelate has strong affinity with the metal forming the reflecting layer of the anode, so that particles or protrusions formed on the reflecting layer can be effectively reduced, and the performance of the organic light-emitting device is improved.
Optionally, the first conductive layer 211 is a transparent metal oxide, and the reflective layer 212 is silver or aluminum, or an alloy containing silver or aluminum.
The material of the first conductive layer 211 may be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO), or Indium Gallium Zinc Oxide (IGZO), and the specific material may be selected according to actual needs, and the material of the reflective layer 212 may be silver (Ag), aluminum (Al), or an alloy containing Ag or Al. Optionally, when the material of the reflective layer is an alloy containing Ag or Al, the volume ratio of Ag or Al is greater than or equal to 80% to ensure that the reflective layer has high reflective performance.
Fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 7, optionally, the transition layers include a first transition layer 2131 and a second transition layer 2132, the first transition layer 2131 is located between the reflective layer 212 and the planarization layer 30, and the second transition layer 2132 is located between the first conductive layer 211 and the reflective layer 212.
It is understood that the first transition layer 2131 and the second transition layer 2132 may be made of the same material and formed by the same process, so as to reduce the process difficulty. Optionally, with continued reference to fig. 7, the display panel may further include a second conductive layer 214, which further improves the hole injection property of the anode 21 and improves the performance of the organic light emitting device.
Optionally, the thickness of the transition layer is 1nm to 10 nm. The thickness of the transition layer is too thin to play a good role in preventing particles from being generated in the reflective layer, and too thick may cause the conductivity of the anode to be reduced, and the thickness of the transition layer is preferably 1nm to 10 nm. Optionally, the thicknesses of the first conductive layer and the second conductive layer may be 5nm to 15nm, and the thickness of the reflective layer may be 100nm to 200 nm.
To verify the effect of the transition layer on the sheet resistance of the anode, a measurement of the sheet resistance was made with the transition layer disposed between the planarization layer and the reflective layer. The sheet resistance is also called film resistance and is a measured value for indirectly representing the thermal infrared performance of vacuum coating on samples such as a film layer, a glass coating film layer and the like, and the value can be directly converted into thermal infrared radiance. The magnitude of the sheet resistance is independent of the sample size and is given in Ω/□, which is directly translated into sheet resistance or sheet resistance, which is also known as film resistance for film measurements.
In this example, Ag was set to 15nm, and the sheet resistances of the transition layer without the transition layer and the transition layer with the thicknesses of 3nm and 8nm were measured to be 3.17 Ω/□, 0.92 Ω/□, and 0.62 Ω/□, respectively, which indicates that the transition layer can effectively reduce the sheet resistance.
In addition, taking top-emitting organic light-emitting devices of the same structure as an example, the anode structures of the devices of the examples and the comparative examples are as follows:
example A: ITO/transition layer (3 nm)/Ag/ITO;
example B: ITO/transition layer (6 nm)/Ag/ITO;
example C: ITO/transition layer (15 nm)/Ag/ITO;
comparative example: ITO/Ag/ITO;
the results of the experiment are as follows:
wherein, Voltage @10mA/cm2Indicates a current density of 10mA/cm2With organic light-emitting devicesThreshold voltage (smaller values indicate better performance of the organic light emitting device); E/CIEy @10mA/cm2Indicating a CIE color system at 10mA/cm2Blue light efficiency (a larger value indicates better performance of the organic light emitting device); LT95@50mA/cm2Expressed at 10mA/cm2The time taken for the time to fall to 95% of the original luminance (the larger the value, the better the performance of the organic light emitting device, in hours); as can be seen from the data in the table above, the performance of examples a and B is better than that of the comparative example, and the performance of example C is worse than that of the comparative example, which indicates that the transition layer should not be set too thick.
Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 8, the display device 1 includes any one of the display panels 2 provided in the embodiments of the present invention. The liquid crystal display device 1 may be a mobile phone, a computer, an intelligent wearable device, and the like.
The display device provided by the embodiment of the invention comprises the display panel provided by the embodiment, and all the beneficial effects of the display panel can be realized, namely, the transition layer is arranged between the first conducting layer and the flat layer, and the transition layer and the reflecting layer have better compatibility, so that the reflecting layer can be effectively prevented from generating particles or bulges, the square resistance of the anode is effectively reduced, the power consumption of the organic light-emitting device is reduced, and the performance of the display panel is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A display panel, comprising:
the driving device comprises a substrate base plate, a driving circuit and a driving circuit, wherein a plurality of driving elements are arranged on the substrate base plate;
an organic light emitting device disposed corresponding to the driving element, the organic light emitting device including an anode and a cathode, and an organic functional layer between the anode and the cathode;
a planar layer between the anode and the substrate base plate; wherein,
the anode comprises a first conducting layer and a reflecting layer located on one side, facing the substrate, of the first conducting layer, the anode further comprises a transition layer and a second conducting layer arranged between the reflecting layer and the flat layer, the transition layer is located between the first conducting layer and the reflecting layer, and/or the transition layer is located between the reflecting layer and the second conducting layer and comprises an organic material, the organic material and the reflecting layer have good compatibility, and the transition layer is used for reducing the sheet resistance of the anode.
2. The display panel according to claim 1, wherein the driving element comprises a first thin film transistor, a drain of the first thin film transistor is connected to the anode through a via, and the reflective layer extends to the via and contacts the drain.
3. The display panel of claim 1, wherein the highest occupied orbital level HOMO1 of the transition layer and the work function of the reflective layer
Satisfies the following conditions:
4. the display panel according to claim 1, wherein the highest occupied orbital level HOMO1 of the transition layer and the work function of the second conductive layer
Satisfies the following conditions:
5. the display panel according to claim 1, wherein the organic material comprises at least one of an oxazole derivative or a metal chelate.
6. The display panel according to claim 1, wherein the first conductive layer is a transparent metal oxide, and the reflective layer is silver or aluminum, or an alloy containing silver or aluminum.
7. The display panel according to claim 1, wherein the transition layer has a thickness of 1nm to 10 nm.
8. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633293A (en) * | 2016-03-25 | 2016-06-01 | 京东方科技集团股份有限公司 | OLED (Organic Light Emitting Diode) device and display device |
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| CN107452770A (en) * | 2017-05-22 | 2017-12-08 | 茆胜 | The anode electrode structure and preparation method of organic TOP EMISSION DISPLAY DEVICESThe, display |
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