CN106601781B - Organic light emitting display panel and display device - Google Patents
Organic light emitting display panel and display device Download PDFInfo
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- CN106601781B CN106601781B CN201710060514.XA CN201710060514A CN106601781B CN 106601781 B CN106601781 B CN 106601781B CN 201710060514 A CN201710060514 A CN 201710060514A CN 106601781 B CN106601781 B CN 106601781B
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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
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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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
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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
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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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
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses an organic light-emitting display panel and a display device, wherein the organic light-emitting display panel comprises a display area and a non-display area, the display area comprises a substrate, a driving circuit layer and a light-emitting device layer positioned on the driving circuit layer; the non-display area comprises a retaining wall arranged around the display area, the retaining wall comprises at least one supporting layer, a blocking layer positioned on the supporting layer and a plurality of bulges formed on the blocking layer, and the bulges are sequentially arranged along the direction far away from the display area; the organic light emitting display panel further comprises an encapsulation layer, wherein the encapsulation layer covers the display area and part of the convex surface. Through designing the barricade top for a plurality of archs for only need a barricade just can realize sealing the encapsulation layer edge, thereby reduce display panel's frame width, a plurality of archs produce deformation when receiving the mask extrusion and compensate the gap, and a plurality of archs have also increased the route of reaction gas diffusion when the deposit, thereby make it can end in a plurality of archs and eliminate the shadow effect.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to an organic light-emitting display panel and a display device.
Background
In the manufacturing process of the organic light-emitting display panel, an inorganic film is deposited in a display area by using a mask plate to form a thin film packaging layer structure, so that the organic light-emitting material is prevented from being corroded by water vapor.
In order to ensure that the mask does not damage the display device and the flat cable, a Dam (Bank or Dam) having a certain height is used to support the edge of the mask. In the prior art, in order to ensure the encapsulation effect of the inorganic encapsulation layer at the edge, a plurality of retaining walls are used to form a boundary, and a gap is left between the retaining walls, so that the width of the frame is increased.
Therefore, how to achieve a good sealing effect of the retaining wall without increasing the frame width of the display panel is a problem to be solved.
Disclosure of Invention
The invention provides an organic light-emitting display panel and a display device, which are used for effectively packaging a packaging layer without increasing the frame width of the display panel.
In a first aspect, embodiments of the present invention provide an organic light emitting display panel including a display region and a non-display region.
The display area comprises a substrate, a driving circuit layer and a light-emitting device layer positioned on the driving circuit layer;
the non-display area comprises a retaining wall arranged around the display area, the retaining wall comprises at least one supporting layer, a blocking layer positioned on the supporting layer and a plurality of bulges formed on the blocking layer, and the bulges are sequentially arranged along the direction far away from the display area;
the organic light emitting display panel further comprises an encapsulation layer, wherein the encapsulation layer covers the display area and part of the convex surface.
In a second aspect, an embodiment of the present invention provides a display device, including any one of the display panels described above.
The embodiment of the invention provides an organic light-emitting display panel and a display device, which comprise a display area and a non-display area, wherein the non-display area comprises a retaining wall arranged around the display area, the retaining wall comprises at least one supporting layer, a blocking layer positioned on the supporting layer and a plurality of bulges formed on the blocking layer, and the bulges are sequentially arranged along the direction far away from the display area. The top end of the retaining wall is designed into a plurality of raised undulating structures, so that the edge of the packaging layer can be sealed only by one retaining wall, and the frame width of the display panel is reduced. In addition, when the mask plate for depositing the packaging layer is placed on the plurality of bulges, even if gaps exist between the mask plate and the plurality of bulges, the mask plate slightly extrudes the plurality of bulges to enable the plurality of bulges to generate different deformations, so that the gaps can be compensated, meanwhile, the plurality of bulges increase the path of reaction gas diffusion in the deposition process, the diffusion can be finished in the plurality of bulges, and the shadow effect is eliminated. In the subsequent cutting process, the packaging layer is not broken and the light-emitting device is not influenced by the external environment due to the cutting of the overflowing packaging layer. In addition, the effect of blocking moisture on the side edge of the retaining wall can be further improved by arranging the blocking layer.
Drawings
Fig. 1 is a schematic structural diagram of a barrier wall of a display panel in the prior art;
FIG. 2 is a schematic diagram of a structure of a shadow-effect barrier of a display panel in the prior art;
fig. 3 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the organic light emitting display panel of FIG. 3 along the section line A-A;
FIG. 5 is a schematic cross-sectional view of the organic light emitting display panel of FIG. 3 along the cross-sectional line B-B;
FIG. 6A is a schematic view of a plurality of protrusions in a retaining wall according to an embodiment of the present invention;
FIG. 6B is a schematic view of a plurality of protrusions in another retaining wall according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view illustrating another organic light emitting 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.
Fig. 1 is a schematic structural diagram of a barrier wall of a display panel in the prior art, and referring to fig. 1, in a non-display region, an intermediate layer 4, an inorganic encapsulation layer 2 and a barrier wall 1 are disposed on a substrate 5. The intermediate layer 4 includes a signal line layer, an insulating layer, and the like, and the dam 1 serves to support the mask 3 (which is removed after its function is completed) forming the inorganic encapsulation layer 2. In order to ensure the encapsulation effect of the barriers 1 on the inorganic encapsulation layer 2 at the edges in the prior art, a plurality of barriers 1 are formed in the non-display region, so that the inorganic encapsulation layer 2 formed by using the mask 3 has the shape structure shown in fig. 1 at the edges. However, the plurality of walls 1 have a space D1 therebetween, which increases the frame width of the display panel. Fig. 2 is a schematic structural diagram of a prior art barrier wall with a shadow effect of a display panel, in which an intermediate layer 4, an inorganic encapsulation layer 2 and a retaining wall 1 are disposed on a substrate 5. Referring to fig. 2, for convenience of description, only one inorganic encapsulation layer 2 is shown, when the inorganic encapsulation layer 2 is deposited by using the mask 3, a shadow effect exists, that is, the inorganic encapsulation layer 2 is deposited outside the retaining wall 1 through a gap between the mask 3 and the retaining wall 1 at an edge, if the inorganic encapsulation layer 2 deposited outside the retaining wall 1 is damaged during cutting, a crack is easily generated to affect a side edge encapsulation effect, and therefore, a space D2 needs to be left from the outside of the retaining wall 1 to a cutting edge, which also increases a frame width of the display panel.
To solve the above problems, embodiments of the present invention provide an organic light emitting display panel. Fig. 3 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention, and fig. 4 is a schematic structural diagram of a cross-section of the organic light emitting display panel of fig. 3 along a section line a-a, referring to fig. 3, the display panel includes a display region 11 and a non-display region 12, and the non-display region 12 includes a retaining wall 120 disposed around the display region 11. Referring to fig. 4, since the embodiment of the present invention is mainly described with respect to the dam in the non-display region, the substrate, the driving circuit layer, and the light emitting device layer on the driving circuit layer included in the display region are not shown in fig. 4. In fig. 4, the non-display region includes a retaining wall 120, the retaining wall 120 includes at least one supporting layer 121, a blocking layer 122 on the supporting layer 121, and a plurality of protrusions 123 formed on the blocking layer 122, wherein the plurality of protrusions 123 are sequentially arranged in a direction away from the display region; the organic light emitting display panel further includes an encapsulation layer 13, and the encapsulation layer 13 covers the display region 11 and a portion of the surface of the protrusion 123. At least one outermost convex surface of the retaining wall 120 is not covered with the encapsulation layer 13. The outer side is in a direction away from the display area. The encapsulation layer 13 includes inorganic encapsulation layers 131 and 132 and an organic encapsulation layer 133, and it should be noted that the encapsulation layer 13 may be designed as a multi-layer inorganic encapsulation layer and a multi-layer organic encapsulation layer as needed in actual design, which is not limited in the embodiment of the present invention. In addition, the substrate 100 of the non-display area and the substrate of the display area are the same substrate. Referring to fig. 4, compared to the prior art, by designing the top end of one retaining wall 120 as the undulating structure of the plurality of protrusions 123, only one retaining wall is needed to seal the edge of the encapsulation layer 13, thereby reducing the bezel width of the display panel. In addition, when the mask 10 for depositing the encapsulation layer 13 is placed on the plurality of protrusions 123, even if gaps exist between the mask 10 and the plurality of protrusions 123, the plurality of protrusions 123 are deformed differently by the weak extrusion of the mask 10 on the plurality of protrusions 123, so that the generated gaps can be compensated, and the shadow effect is further weakened; meanwhile, even if gaps still exist, the plurality of protrusions 123 increase the diffusion path of the reaction gas in the deposition process, and the shadow effect can be ended in the plurality of protrusions 123 without spreading to at least one protrusion on the outermost side, so that the encapsulating layer cannot overflow to the outer side of the retaining wall, and the cracking of the encapsulating layer caused by the cutting of the subsequent encapsulating layer is avoided. A barrier layer 122 is further included between the plurality of protrusions 123 and the at least one supporting layer 121, and the inorganic encapsulation layer 131 can contact the barrier layer 122 in the plurality of protrusions 123, so as to further increase the moisture blocking effect of the side edges of the retaining wall 120. The barrier layer 160 also serves to prevent moisture from entering the display region from between the inorganic encapsulation layer 131 and the intermediate layer 110.
Alternatively, in the organic light emitting display panel described above, the barrier layer 160 is formed of an inorganic material or a metal material. Since inorganic substances and metal materials have a good moisture barrier effect, the barrier layer 160 may be made of inorganic substances such as silicon nitride and aluminum oxide, or may be made of metal materials. Optionally, in the organic light emitting display panel, the retaining wall is continuously disposed around the display region. Referring to fig. 3 and 4, by disposing the retaining wall 120 continuously around the display region 11, the edges of the inorganic encapsulation layers 131 and 132 can be completely sealed, and the sealing effect of the encapsulation layer 13 can be prevented from being damaged due to gaps.
Optionally, in the organic light emitting display panel, the retaining wall located outside the corner region of the display area is an arc-shaped retaining wall; a groove is arranged corresponding to the arc-shaped retaining wall and is positioned in the non-display area on the inner side of the arc-shaped retaining wall. Fig. 5 is a schematic cross-sectional view of the organic light emitting display panel of fig. 3 along a section line B-B, referring to fig. 5, there are an intermediate layer 110 (including a signal line layer, an insulating layer, etc.), a dam 120 and a groove 150 on a substrate 100. Referring to fig. 3, the retaining wall 120 outside the corner region of the display area is an arc-shaped retaining wall 120, a groove 150 is formed corresponding to the arc-shaped retaining wall 120, and the groove 150 is located in the middle layer 110 in the non-display area inside the arc-shaped retaining wall 120. The packaging layer for sealing the light-emitting device layer in the display area comprises inorganic and organic packaging layers, when the circular arc-shaped retaining wall 120 is formed, the distance from the retaining wall 120 to the display area is reduced by the circular arc structure, when the organic layer in the packaging layer is formed, the flow of the organic layer can be slowed down by the groove 150, the upper surface of the organic layer is flat, and the problem that the surface of the organic packaging layer is not flat after the organic packaging layer is formed due to the fact that the circular arc-shaped retaining wall is formed is solved.
Optionally, in the organic light emitting display panel, the plurality of protrusions may be a plurality of separated protrusions, a plurality of continuous protrusions, or a plurality of protrusions overlapping each other. Fig. 6A-B are schematic structural views of a plurality of protrusions in a retaining wall according to an embodiment of the present invention, and referring to fig. 6A and 6B, the retaining wall 120 includes a supporting layer 121 (only one layer is schematically shown in the figures) and a plurality of protrusions 123, wherein the plurality of protrusions 123 may be a plurality of separated protrusions 123, a plurality of continuous protrusions 123, or a plurality of protrusions 123 overlapping each other, so that there is more selectivity in the processing of the retaining wall.
Optionally, in the organic light emitting display panel, a cross-sectional shape of the protrusion perpendicular to the display panel is a trapezoid, a rectangle, a triangle, a square, or a semicircle.
Optionally, in the organic light emitting display panel, the encapsulation layer further includes at least one inorganic encapsulation layer, and a distance between a boundary of the at least one inorganic encapsulation layer and a boundary of the plurality of protrusions away from the display area is greater than or equal to half of a width of a single protrusion. The boundary of at least one inorganic packaging layer is positioned inside the plurality of bulges, so that the retaining wall can seal the packaging layer.
Optionally, in the organic light emitting display panel, the light emitting device layer further includes a first electrode layer; the barrier layer and the first electrode layer are formed at the same layer. The light emitting device layer generally includes a cathode and an anode with an organic light emitting material disposed therebetween, and the first electrode layer may be one of the cathode or the anode. The first electrode formed in the display region is generally a metal material, so the barrier layer 160 can be formed simultaneously with the first electrode in the display region, thereby reducing the number of process steps and the processing cost.
Optionally, in the organic light emitting display panel, the retaining wall further includes at least one layer of a height increasing layer; the elevated layer is positioned between the at least one support layer and the plurality of protrusions. Fig. 7 is a schematic cross-sectional structure view of another organic light emitting display panel according to an embodiment of the present invention, and referring to fig. 7 and fig. 4, the difference from fig. 4 is that a height-increasing layer 124 may be added between at least one supporting layer 121 and a plurality of protrusions 123, and the height of the dam 120 may be further increased by using the height-increasing layer 124, so as to block the flow of the organic encapsulation layer (refer to fig. 4) in the encapsulation layer.
Optionally, in the organic light emitting display panel, the light emitting device layer further includes a pixel defining layer and an organic pad layer on the pixel defining layer, wherein at least one of the enhancement layer and the pixel defining layer are formed in the same layer, and the plurality of protrusions are formed in the same layer as the organic pad layer. The organic pad layer is located between the pixel defining layer and the encapsulation layer and is used for protecting the light emitting device layer (such as a protective cathode layer) in the manufacturing process. In the process of forming a light emitting device layer in a display region, a pixel definition layer for determining the formation position of a pixel point and an organic cushion layer for supporting a mask for depositing a light emitting material are formed. Therefore, the raised layer 124 in the non-display region and the pixel definition layer can be formed in the same layer, and the plurality of protrusions 123 and the organic pad layer can be formed in the same layer, so as to reduce the complexity of the dam process and the process steps, and save the process cost and the process time.
Optionally, in the organic light emitting display panel, the light emitting device layer further includes a pixel defining layer; the plurality of protrusions are formed in the same layer as the pixel defining layer in the display region. In the process of forming the light emitting device layer in the display region, a pixel defining layer is also formed, and when the plurality of protrusions in the bank are formed in the non-display region, the pixel defining layer can be formed simultaneously with the pixel defining layer to save process cost and processing time.
Optionally, in the organic light emitting display panel, the light emitting device layer further includes a planarization layer; at least one support layer is formed in the same layer as the planarization layer in the display area. In forming the light emitting device layers in the display region, a planarization layer is also formed, wherein the planarization layer is used to more easily form other layers, such as the pixel defining layer and the first electrode, over the planarization layer. When at least one supporting layer in the retaining wall is formed in the non-display area, the supporting layer and the planarization layer can be formed at the same time, so that the process steps are saved, and the money and time cost are reduced.
Optionally, in the organic light emitting display panel, the width of the retaining wall is 50 to 90 um. Referring to fig. 4, the width L1 of the retaining wall in the embodiment of the present invention is preferably 50-90 um; the width L2 of the plurality of protrusions is preferably 55-75 um; the sum L3 of the width of a single projection and the width of the space between two adjacent projections is preferably 15-25 um. By adopting the size range, the narrow frame design of the display panel is facilitated, and the number of the protrusions can reach a certain number, namely, the retaining wall can also play a role in eliminating the shadow effect while the frame of the display panel is not too wide.
Optionally, in the organic light emitting display panel, the number of the protrusions is greater than or equal to 3, so as to achieve the purposes of effectively increasing diffusion paths and eliminating a shadow effect.
The embodiment of the invention also provides a display device which comprises any one of the display panels. Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 8, the display device includes a display panel 300, where the display panel 300 is a display panel according to any embodiment of the present invention, where the display device may be a mobile phone as shown in the drawing, or may be a computer, a television, an intelligent wearable display device, and the like, and this is not particularly limited in the embodiment of the present invention.
The embodiment of the invention also provides a manufacturing method of the organic light-emitting display panel, which comprises the following steps: the display panel comprises a display area and a non-display area, and the method comprises the following steps: manufacturing a driving circuit layer, a light-emitting device layer and a retaining wall, wherein the driving circuit layer and the light-emitting device layer are positioned in a display area, the retaining wall is positioned in a non-display area and comprises at least one supporting layer and a plurality of bulges positioned on the at least one supporting layer, and the bulges are sequentially arranged along the direction far away from the display area; and forming an encapsulation layer on the light-emitting device layer and on the part of the surface of the retaining wall, which is far away from the substrate. Specifically, in the method for manufacturing an organic light emitting display panel according to the embodiment of the present invention, the top end of the retaining wall is designed to be a plurality of raised undulating structures, so that only one retaining wall is required to seal the edge of the encapsulation layer, thereby reducing the frame width of the display panel. In addition, when the mask used for depositing the packaging layer is placed on the plurality of bulges, even if gaps exist between the mask and the plurality of bulges, the mask slightly extrudes the plurality of bulges to enable the plurality of bulges to generate different deformations, so that the gaps can be compensated; meanwhile, the plurality of protrusions increase the path of the reaction gas diffusion during the deposition process, and the diffusion process can be terminated within the plurality of protrusions, thereby eliminating the shadow effect.
Optionally, in the method for manufacturing an organic light emitting display panel, the manufacturing at least one support layer and a plurality of protrusions formed on the at least one support layer in the non-display area includes: a plurality of protrusions are formed on at least one support layer using a halftone mask technique. Continuous smooth concave-convex-shaped protrusions can be formed on the top of the retaining wall by using a Half-tone Mask technology (Half-tone Mask) or adjusting process parameters such as exposure metering, ashing conditions and the like.
It should be noted that the apparatus for manufacturing an organic light emitting display panel according to the embodiment of the present invention may be used to perform the method for manufacturing an organic light emitting display panel according to the embodiment of the present invention, and has corresponding functions and advantages.
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 changes, rearrangements 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 (10)
1. An organic light emitting display panel including a display region and a non-display region,
the display area comprises a substrate, a driving circuit layer and a light-emitting device layer positioned on the driving circuit layer;
the non-display area comprises a retaining wall arranged around the display area, the retaining wall comprises at least one supporting layer, a blocking layer positioned on the supporting layer and a plurality of bulges formed on the blocking layer, and the bulges are sequentially arranged along the direction far away from the display area;
the organic light-emitting display panel further comprises an encapsulation layer, wherein the encapsulation layer covers the display area and part of the surface of the bulge;
at least one of the surfaces of the bulges on the outermost side of the retaining wall does not cover the packaging layer, the outer side of the surface is far away from the display area, and the edge of the packaging layer is sealed by one retaining wall of the organic light-emitting display panel;
the packaging layer comprises at least one inorganic packaging layer and at least one organic packaging layer, and the organic packaging layer is stopped at the bulge adjacent to the display area.
2. The display panel according to claim 1, wherein the barrier layer is formed of an inorganic material or a metal material.
3. The display panel according to claim 1,
the distance between the boundary of the at least one inorganic packaging layer and the boundary of the plurality of bulges far away from the display area is greater than or equal to half of the width of a single bulge.
4. The display panel according to claim 1, wherein the light-emitting device layer comprises a first electrode layer;
the barrier layer and the first electrode layer are formed in the same layer.
5. The display panel of claim 1, wherein the dam further comprises at least one layer of a heightening layer; the elevated layer is located between the at least one support layer and the plurality of protrusions.
6. The display panel according to claim 5, wherein the light-emitting device layer comprises a pixel defining layer and an organic pad layer on the pixel defining layer;
a layer of the enhancement layer is formed in the same layer as the pixel definition layer;
the plurality of protrusions are formed in the same layer as the organic cushion layer.
7. The display panel according to claim 1, wherein the light-emitting device layer comprises a pixel defining layer;
the plurality of protrusions are formed in the same layer as the pixel defining layer.
8. The display panel according to claim 1, wherein the light-emitting device layer comprises a planarization layer;
at least one of the support layers is formed in the same layer as the planarization layer in the display region.
9. The display panel according to any one of claims 1 to 8, wherein the number of the projections is 3 or more.
10. A display device comprising the display panel of any one of claims 1-9.
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| CN201710060514.XA CN106601781B (en) | 2017-01-25 | 2017-01-25 | Organic light emitting display panel and display device |
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| CN201710060514.XA CN106601781B (en) | 2017-01-25 | 2017-01-25 | Organic light emitting display panel and display device |
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| CN106601781B true CN106601781B (en) | 2019-12-24 |
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