CN110197877B - AMOLED display panel - Google Patents
AMOLED display panel Download PDFInfo
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- CN110197877B CN110197877B CN201810159439.7A CN201810159439A CN110197877B CN 110197877 B CN110197877 B CN 110197877B CN 201810159439 A CN201810159439 A CN 201810159439A CN 110197877 B CN110197877 B CN 110197877B
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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
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
- H10K50/8445—Encapsulations multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
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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
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/846—Passivation; Containers; Encapsulations comprising getter material or desiccants
Abstract
The invention relates to the technical field of display, and discloses an AMOLED display panel which is provided with an anode layer, an organic light emitting layer, a cathode layer, a covering layer and an encapsulation layer TFE along the direction from a bottom layer to a top layer, and further comprises a buffer layer arranged between the TFE and the organic light emitting layer, wherein the preparation material of the buffer layer comprises a water absorbing material. Among the above-mentioned AMOLED display panel, including being provided with anode layer, organic luminescent layer, cathode layer, overburden and encapsulated layer TFE along bottom to top layer direction, still including locating the buffer layer between TFE and the organic luminescent layer, when steam permeates TFE and permeates to the organic luminescent layer, because the buffer layer is located between TFE and the organic luminescent layer, and the preparation material of this buffer layer includes water absorbing material, then the buffer layer can absorb the steam that reaches the buffer layer and form the secondary protection to the organic luminescent layer.
Description
Technical Field
The invention relates to the technical field of display, in particular to an AMOLED display panel.
Background
Compared with LCD displays, Active-matrix organic light emitting diode (AMOLED) displays have the advantages of being flexible, low in energy consumption, ultra-light and thin, and capable of protecting eyes healthily, and are considered as mainstream technologies of next-generation flat panel displays by the industry, especially, flexible display technologies of AMOLEDs based on thin film packaging processes have become a trend of development of next-generation flat panel display technologies.
The conventional flexible AMOLED device has a sandwich structure (as shown in fig. 1) formed by "anode layer 1/organic light emitting layer 2/cathode layer 3/cover layer 4/encapsulation layer TFE 5", wherein the organic light emitting layer 2, the cathode layer 3 and the cover layer 4 are mainly prepared by evaporation, the TFE5 is mainly prepared by Plasma Enhanced Chemical Vapor Deposition (PECVD) equipment, and the TFE5 has a main function of blocking water Vapor to prevent water Vapor from invading to cause failure of the AMOLED light emitting device.
However, there are a number of issues that need to be addressed with this structure: because TFE5 is a stacked structure formed by alternately stacking inorganic film layers 51 and organic film layers 52, the capability of blocking water vapor mainly depends on the inorganic film layers 51, the organic film layers 52 only function as stress buffer layers, and the inorganic film layers 51 are prone to cracking due to excessive stress, so that water vapor is prone to invading, and once cracking of the inorganic layer occurs, failure of the organic light-emitting material is directly caused.
Disclosure of Invention
The AMOLED display panel provided by the invention is additionally provided with the additional buffer layer, so that the organic light emitting layer is protected after TFE is broken, and secondary protection on the organic light emitting layer is formed.
In order to achieve the purpose, the invention provides the following technical scheme:
an AMOLED display panel is provided with an anode layer, an organic light emitting layer, a cathode layer, a covering layer and an encapsulation layer TFE along the direction from a bottom layer to a top layer, and further comprises a buffer layer arranged between the TFE and the organic light emitting layer, wherein the preparation material of the buffer layer comprises a water absorption material.
Among the above-mentioned AMOLED display panel, including being provided with anode layer, organic luminescent layer, cathode layer, overburden and encapsulated layer TFE along bottom to top layer direction, still including locating the buffer layer between TFE and the organic luminescent layer, when steam permeates TFE and permeates to the organic luminescent layer, because the buffer layer is located between TFE and the organic luminescent layer, and the preparation material of this buffer layer includes water absorbing material, then the buffer layer can absorb the steam that reaches the buffer layer to form the secondary protection to the organic luminescent layer.
The AMOLED display panel provided by the invention utilizes the TFE and the buffer layer to form double protection on the organic light emitting layer, and the service life of the organic light emitting layer can be prolonged, so that the service life of the whole AMOLED display panel is prolonged.
Therefore, the AMOLED display panel is additionally provided with the additional buffer layer, so that the organic light emitting layer is protected after the TFE is broken, and secondary protection for the organic light emitting layer is formed.
Preferably, the buffer layer is interposed between the organic light emitting layer and the cathode layer; alternatively, the first and second electrodes may be,
the buffer layer is arranged between the cathode layer and the covering layer; alternatively, the first and second electrodes may be,
the buffer layer is interposed between the cover layer and the TFE.
Preferably, the buffer layer is a single-layer structure prepared by mixing an organic polymer compound material having a water absorption effect and an inorganic material having a water absorption effect.
Preferably, the buffer layer includes an organic layer formed of an organic polymer compound material and an inorganic layer formed of an inorganic material, and the organic layer and the inorganic layer are stacked in a bottom layer to top layer direction.
Preferably, the organic polymer compound material is an organic compound having a group having a water-absorbing effect, and the inorganic material is an inorganic salt having a water-absorbing effect.
Preferably, the preparation material of the buffer layer also comprises a material with the functions of absorbing water and blocking plasma.
Preferably, the material having both water absorption and plasma barrier effects comprises one or more of lithium fluoride, lithium chloride, lithium bromide, calcium chloride, calcium fluoride and magnesium chloride.
Preferably, the TFE includes at least one stacked structure formed by stacking an organic film layer and an inorganic film layer in the bottom-to-top direction.
Preferably, the TFE includes two inorganic film layers and one organic film layer, and the organic film layer is interposed between the two inorganic film layers.
Preferably, the inorganic film layer is disposed on a peripheral side of the organic film layer.
Drawings
FIG. 1 is a diagram of a prior art AMOLED display panel;
fig. 2 is a structural diagram of an AMOLED display panel according to an embodiment of the present invention;
fig. 3 is another structural diagram of an AMOLED display panel according to an embodiment of the invention;
fig. 4 is another structural diagram of an AMOLED display panel according to an embodiment of the present invention;
fig. 5 is another structural diagram of the AMOLED display panel according to the embodiment of the present invention.
Icon: 1-an anode layer; 2-an organic light-emitting layer; 3-a cathode layer; 4-a cover layer; 5-TFE; 51-an inorganic film layer; 52-organic film layer; 6-buffer layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 2, the present invention provides an AMOLED display panel, wherein an anode layer 1, an organic light emitting layer 2, a cathode layer 3, a cover layer 4, and an encapsulation layer TFE5 are disposed along a direction from a bottom layer to a top layer, the AMOLED display panel further includes a buffer layer 6 disposed between the TFE5 and the organic light emitting layer 2, and a preparation material of the buffer layer 6 includes a water absorbing material.
In the AMOLED display panel, the anode layer 1, the organic light emitting layer 2, the cathode layer 3, the cover layer 4 and the encapsulation layer TFE5 are arranged along the direction from the bottom layer to the top layer, the AMOLED display panel further comprises the buffer layer 6 arranged between the TFE5 and the organic light emitting layer 2, when water vapor permeates through the TFE5 to permeate into the organic light emitting layer 2, the buffer layer 6 is arranged between the TFE5 and the organic light emitting layer 2, and the preparation material of the buffer layer 6 comprises the water absorption material, so that the buffer layer 6 can absorb the water vapor reaching the buffer layer 6, and secondary protection of the organic light emitting layer 2 is formed.
The AMOLED display panel provided by the invention utilizes the TFE5 and the buffer layer 6 to form double protection on the organic light emitting layer 2, so that the service life of the organic light emitting layer 2 can be prolonged, and the service life of the whole AMOLED display panel is prolonged.
Therefore, the AMOLED display panel described above adds the additional buffer layer 6, which is beneficial to protect the organic light emitting layer 2 after the rupture of TFE5, and forms a secondary protection for the organic light emitting layer 2.
On the basis of the above technical solutions, it should be noted that there are many possibilities for the buffer layer 6 to be located at a specific position between the organic light emitting layer 2 and the TFE5, and specifically, it is at least one of the following structures:
the structure I is as follows: with continued reference to fig. 2, the buffer layer 6 is disposed between the organic light emitting layer 2 and the cathode layer 3.
The structure II is as follows: referring to fig. 3, the buffer layer 6 is disposed between the cathode layer 3 and the capping layer 4.
The structure is three: referring to fig. 4, a buffer layer 6 is disposed between the capping layer 4 and TFE 5.
On the basis of the above technical solutions, it should be noted that the buffer layer 6 may be formed in various forms, at least one of the following forms:
the first form: the buffer layer 6 is a single-layer structure prepared by mixing an organic polymer material having a water-absorbing effect and an inorganic material having a water-absorbing effect.
The second form: the buffer layer 6 includes an organic layer formed of an organic high molecular compound material and an inorganic layer formed of an inorganic material, and the organic layer and the inorganic layer are stacked in the bottom-to-top direction.
The specific number of the organic layers formed by the organic polymer compound and the inorganic layers formed by the inorganic material in the stacked structure can be set according to the use requirement.
On the basis of the technical scheme, the organic high molecular compound material is an organic compound with a water absorption function group, and the inorganic material is an inorganic salt with a water absorption function.
Specifically, the organic polymer compound material may be an organic compound having a group having a water-absorbing action, such as a hydroxyl group or a carboxyl group.
On the basis of the above technical solution, as a preferred embodiment, the preparation material of the buffer layer 6 further includes a material having both a water absorbing function and a plasma blocking function.
It should be noted that, while absorbing water Vapor, the buffer layer 6 in the AMOLED display panel provided by the present invention can prevent the organic light emitting layer 2 from being damaged by ions in a Plasma Enhanced Chemical Vapor Deposition (PECVD) process for forming TFE5, thereby avoiding the problem of reduction and even failure of the light emitting efficiency of the organic light emitting layer 2.
Specifically, the material having both the water absorption function and the plasma blocking function comprises one or more of lithium fluoride, lithium chloride, lithium bromide, calcium chloride, calcium fluoride and magnesium chloride.
Lithium salts such as lithium fluoride, lithium chloride and lithium bromide, calcium salts such as calcium chloride and calcium fluoride, and magnesium salts such as magnesium chloride have both a water absorbing effect and a plasma blocking effect.
Based on the above technical solution, TFE5 includes at least one stacked structure formed by stacking organic film 52 and inorganic film 51 in the bottom-to-top direction.
Preferably, TFE5 includes two inorganic film layers 51 and one organic film layer 52, and the organic film layer 52 is disposed between the two inorganic film layers 51.
In addition to the above technical solutions, in order to enhance the waterproof effect of TFE5, as a preferred embodiment, an inorganic film layer 51 is disposed on the peripheral side of the organic film layer 52, for example, as shown in fig. 5.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. An AMOLED display panel is provided with an anode layer, an organic light emitting layer, a cathode layer, a covering layer and an encapsulation layer TFE along the direction from a bottom layer to a top layer, and is characterized by further comprising a buffer layer arranged between the TFE and the organic light emitting layer, wherein the preparation material of the buffer layer comprises a water absorbing material;
the TFE comprises at least one stacked structure formed by overlapping an organic film layer and an inorganic film layer along the direction from the bottom layer to the top layer, wherein the TFE comprises two inorganic film layers and one organic film layer, the organic film layer is arranged between the two inorganic film layers, and the inorganic film layer is arranged on the peripheral side of the organic film layer;
the buffer layer is of a single-layer structure prepared by mixing an organic high-molecular compound material with a water absorption effect and an inorganic material with a water absorption effect.
2. The AMOLED display panel of claim 1, wherein the buffer layer is disposed between the organic light emitting layer and the cathode layer; alternatively, the first and second electrodes may be,
the buffer layer is arranged between the cathode layer and the covering layer; alternatively, the first and second electrodes may be,
the buffer layer is interposed between the cover layer and the TFE.
3. The AMOLED display panel of claim 1 or 2, wherein the organic polymer compound material is an organic compound having a water-absorbing group, and the inorganic material is an inorganic salt having a water-absorbing effect.
4. The AMOLED display panel as recited in claim 3, wherein the buffer layer is made of a material that has both water absorbing and plasma blocking properties.
5. The AMOLED display panel as recited in claim 4, wherein the material having both water absorbing and plasma blocking effects comprises one or more of lithium fluoride, lithium chloride, lithium bromide, calcium chloride, calcium fluoride and magnesium chloride.
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| CN201810159439.7A CN110197877B (en) | 2018-02-26 | 2018-02-26 | AMOLED display panel |
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| CN201810159439.7A CN110197877B (en) | 2018-02-26 | 2018-02-26 | AMOLED display panel |
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| CN110197877B true CN110197877B (en) | 2021-05-14 |
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