CN111490083A - Display panel, preparation method thereof, edge crack detection method and display device - Google Patents
Display panel, preparation method thereof, edge crack detection method and display device Download PDFInfo
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- CN111490083A CN111490083A CN202010310504.9A CN202010310504A CN111490083A CN 111490083 A CN111490083 A CN 111490083A CN 202010310504 A CN202010310504 A CN 202010310504A CN 111490083 A CN111490083 A CN 111490083A
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- 238000001514 detection method Methods 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title description 6
- 230000002093 peripheral effect Effects 0.000 claims abstract description 43
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 34
- 238000005538 encapsulation Methods 0.000 claims description 20
- 238000000059 patterning Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 102
- 208000037656 Respiratory Sounds Diseases 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000010409 thin film Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 239000011229 interlayer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 239000011241 protective layer Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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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
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/30—Structural arrangements specially adapted for testing or measuring during manufacture or treatment, or specially adapted for reliability measurements
- H01L22/34—Circuits for electrically characterising or monitoring manufacturing processes, e. g. whole test die, wafers filled with test structures, on-board-devices incorporated on each die, process control monitors or pad structures thereof, devices in scribe line
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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
- H10K59/124—Insulating layers formed between TFT elements and OLED elements
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Abstract
The application discloses a display panel, a manufacturing method of the display panel, an edge crack detection method and a display device, which are used for improving the crack detection accuracy of the display panel, avoiding the risks of cracks and packaging failure and missing detection, improving the quality of products and prolonging the service life of the products. According to the display panel provided by the embodiment of the application, the display panel is divided into a display area and a peripheral area outside the display area; the peripheral zone includes: the substrate comprises a substrate base plate, a first electroluminescent device and an inorganic packaging layer, wherein the first electroluminescent device is positioned on the substrate base plate; the first electroluminescent device includes: the light emitting device includes a first anode, a first light emitting layer, and a first cathode stacked in this order.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel, a preparation method of the display panel, an edge crack detection method and a display device.
Background
With the continuous development of display technology, the display panel is applied more and more widely in various fields. In the actual production process of the display panel, cracks are easily generated under the action of stress, and the existence of the cracks can cause the failure of moisture penetration packaging, further form display defects and influence the quality and the service life of the display panel.
Therefore, in the prior art, accurate Crack detection needs to be performed on the display Panel, and a main detection method is to form a circle of metal wires at the edge of the display Panel as a Crack detection (PCD) wire of the display Panel, and Detect electrical parameters (current/voltage, etc.) of the PCD wire through input of an electrical signal to determine whether a Crack exists on the display substrate. However, the electrical parameters of the PCD wire are influenced by multiple factors (the film layer, the environment and the like), and the PCD wire cannot be used for detecting a slight crack and accurately positioning the crack position, so that the risk of missing detection exists.
In conclusion, the prior art cannot detect slight cracks on the edge of the display panel and accurately position the cracks, so that the risk of missing detection exists, and the service quality and the service life of the display panel are affected.
Disclosure of Invention
The embodiment of the application provides a display panel, a preparation method of the display panel, an edge crack detection method and a display device, which are used for improving the crack detection accuracy of the display panel, avoiding the risks of cracks, packaging failure and missed detection, improving the quality of products and prolonging the service life of the products.
According to the display panel provided by the embodiment of the application, the display panel is divided into a display area and a peripheral area outside the display area; the peripheral zone includes: the substrate comprises a substrate base plate, a first electroluminescent device and an inorganic packaging layer, wherein the first electroluminescent device is positioned on the substrate base plate; the first electroluminescent device includes: the light emitting device includes a first anode, a first light emitting layer, and a first cathode stacked in this order.
The display panel that this application embodiment provided, because set up first electroluminescent device in the peripheral region, crackle appears at the display panel edge, even if appear slight crackle, first luminescent layer among the first electroluminescent device can receive water oxygen to corrode and become invalid, the area that first luminescent layer became invalid can not give out light at the in-process that carries out crack detection, thereby can judge whether the display panel has edge crack according to whether first electroluminescent device exists the area that does not give out light, and also can not leak detection to slight crackle, thereby can improve the detection accuracy of display panel edge crack, avoid appearing the risk that display panel encapsulation became invalid. The cracks can also be located according to the areas that do not emit light.
Optionally, the peripheral zone further includes: a first retaining wall and a second retaining wall; the first retaining wall is located between the first electroluminescent device and the display area, and the second retaining wall is located between the first retaining wall and the first electroluminescent device.
Optionally, the first electroluminescent device surrounds the display area.
According to the display panel provided by the embodiment of the application, the first electroluminescent device surrounds the display area, namely the first electroluminescent device is arranged into a closed circle, therefore, cracks appearing in any area of the edge of the display panel can cause a light emitting layer of the first electroluminescent device to be corroded by water and oxygen to fail, so that the cracks appearing in any area of the edge of the display panel can be determined by whether the first electroluminescent device exists in a non-luminous area, the detection accuracy of the cracks on the edge of the display panel is further improved, missing detection is avoided, and the display panel is prevented from being encapsulated and failing.
Optionally, the peripheral zone further includes: a driving lead electrically connected to the first electroluminescent device, and a driving input terminal electrically connected to the driving lead; the drive lead includes: a first drive lead electrically connected to the first anode, and a second drive lead electrically connected to the first cathode.
The display panel provided by the embodiment of the application can provide an electric signal capable of being lightened to the first electroluminescent device in the peripheral area in the crack detection stage, the first electroluminescent device does not need to realize other functions, the electric signal can be provided to the first electroluminescent device in the peripheral area in the crack detection stage only by driving the input terminal, and the display panel is easy to realize without external detection equipment.
Optionally, the display area comprises a second electroluminescent device, and the inorganic encapsulation layer covers the second electroluminescent device; the second electroluminescent device includes: a second anode, a second light emitting layer, and a second cathode stacked over the substrate;
the second anode and the first anode are arranged in the same layer, the second light-emitting layer and the first light-emitting layer are arranged in the same layer, and the second cathode and the first cathode are arranged in the same layer.
According to the display panel provided by the embodiment of the application, the second anode and the first anode are arranged at the same layer, the second light emitting layer and the first light emitting layer are arranged at the same layer, the second cathode and the first cathode are arranged at the same layer, and each structure in the first electroluminescent device and the structure in the second electroluminescent device at the same layer can be formed by adopting the same material and the same mask plate, so that the process is simple and easy to realize, and the investment cost of the material and the mask plate is not required to be increased.
The embodiment of the application provides a preparation method of a display panel, which comprises the following steps:
providing a substrate base plate;
forming a first electroluminescent device including a first anode, a first light emitting layer, and a first cathode stacked in this order on the peripheral region of the substrate base plate;
an inorganic encapsulation layer is formed over the first electroluminescent device.
According to the display panel manufacturing method provided by the embodiment of the application, as the first electroluminescent device is arranged on the peripheral area, when the edge of the display panel cracks, even if slight cracks occur, a first light-emitting layer in the first electroluminescent device can be corroded by water and oxygen to fail, and the area where the first light-emitting layer fails can not emit light in the process of crack detection, so that whether the edge crack exists in the display panel can be judged according to whether the area where the first electroluminescent device does not emit light, and the slight crack cannot be missed to be detected, so that the detection accuracy of the edge crack of the display panel can be improved, and the risk of package failure of the display panel is avoided. The cracks can also be located according to the areas that do not emit light.
Optionally, while forming the first electroluminescent device over the peripheral region of the base substrate, the method further comprises: forming a second electroluminescent device in the display region;
forming the first and second electroluminescent devices specifically includes:
forming an anode layer on the substrate, and forming a pattern of a second anode in the display area and a pattern of a first anode in the peripheral area by adopting a patterning process;
forming a pattern of a second light emitting layer over the second anode and a pattern of a first light emitting layer over the first anode;
and forming a cathode layer on the second light-emitting layer and the first light-emitting layer, and forming a pattern of a second cathode in the display area and a pattern of a first cathode in the peripheral area by using a patterning process.
The crack detection method for the display panel provided by the embodiment of the application comprises the following steps:
providing driving electrical signals to a first anode and a first cathode of the first electroluminescent device, respectively; and determining the light emitting condition of the first electroluminescent device, and if the first electroluminescent device has an unlit area, determining that the display panel has a crack.
According to the crack detection method for the display panel, whether the first light-emitting layer of the first electroluminescent device fails or not is determined by detecting whether the first electroluminescent device arranged on the peripheral area has the non-luminous area or not, so that whether the edge crack exists or not is judged, and the slight crack cannot be missed for detection, so that the detection accuracy of the edge crack of the display panel can be improved, and the risk of package failure of the display panel is avoided. The cracks can also be located according to the areas that do not emit light.
Optionally, determining the light emitting condition of the first electroluminescent device specifically includes: determining whether there is a non-light emitting area of the first electroluminescent device using an automated optical detection system.
According to the display panel crack detection method provided by the application, whether the electroluminescent device has a non-luminous region or not is observed and checked by using an automatic optical Inspection system (AOI), so that the detection accuracy of the non-luminous region can be improved, the detection accuracy of the edge crack of the display panel is further improved, and the risk of package failure of the display panel is avoided. The cracks can also be located according to the areas that do not emit light.
The display device provided by the embodiment of the application comprises the display panel provided by the embodiment of the application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another display panel provided in the embodiment of the present application;
fig. 3 is a schematic diagram illustrating a method for manufacturing a display panel according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a mask used in a method for manufacturing a display panel according to an embodiment of the present disclosure;
fig. 5 is a schematic view of another mask used in a method for manufacturing a display panel according to an embodiment of the present disclosure;
fig. 6 is a schematic view of another mask used in a method for manufacturing a display panel according to an embodiment of the present disclosure;
fig. 7 is a schematic view of a crack detection method of a display panel according to an embodiment of the present application.
Detailed Description
An embodiment of the present application provides a display panel, as shown in fig. 1 and fig. 2, where fig. 2 is a cross-sectional view along AA' of fig. 1, and the display panel is divided into a display area 1 and a peripheral area 2 outside the display area 1; the peripheral section 2 includes: a substrate base plate 3, a first electroluminescent device 4 positioned on the substrate base plate 3, and an inorganic encapsulation layer 5 positioned on the detection electroluminescent device 4; the first electroluminescent device 4 comprises: a first anode 6, a first light emitting layer 7, and a first cathode 8, which are sequentially stacked.
It should be noted that, in the prior art, a display Panel Crack Detection (PCD) line loop is usually provided, and when Crack detection is performed, a signal is provided to the PCD loop, if a PCD line is fractured, a green bright line appears under a black picture, and if the PCD line is not fractured, a purple bright line appears under a white picture, so that in a detection process, whether the PCD line is fractured or not can be determined according to a color of the bright line appearing on the display picture, and then whether a Crack exists at an edge of the display Panel is determined. However, when there is a slight crack at the edge of the display panel and the slight crack does not cause the PCD wire to break, it is determined that there is no crack at the edge of the display panel according to the detection result, and the detection is missed. In the display panel provided in the embodiment of the present application, since the first electroluminescent device is disposed in the peripheral region, if there is a crack at the edge of the display panel, even a slight crack, the first luminescent layer may be corroded by water and oxygen to fail, as shown in fig. 1, for example, the first luminescent layer in the area B fails due to the existence of the edge crack, and when a signal is provided to the first electroluminescent device through the driving lead, the area B does not emit light, so that during detection, when there is an area where the first electroluminescent device does not emit light, it may be determined that there is a crack at the edge of the display panel, and the slight crack is not detected.
The display panel that this application embodiment provided, because set up first electroluminescent device in the peripheral region, crackle appears at the display panel edge, even if appear slight crackle, first luminescent layer among the first electroluminescent device can receive water oxygen to corrode and become invalid, the area that first luminescent layer became invalid can not give out light at the in-process that carries out crack detection, thereby can judge whether the display panel has edge crack according to whether first electroluminescent device exists the area that does not give out light, and also can not leak detection to slight crackle, thereby can improve the detection accuracy of display panel edge crack, avoid appearing the risk that display panel encapsulation became invalid. The cracks can also be located according to the areas that do not emit light.
Optionally, as shown in fig. 1 and fig. 2, the peripheral area 2 further includes: a first retaining wall 9 and a second retaining wall 10; the first retaining wall 9 is located between the first electroluminescent device 4 and the display region 1, and the second retaining wall 10 is located between the first retaining wall 9 and the first electroluminescent device 4.
Alternatively, as shown in fig. 1, the first electroluminescent device 4 surrounds the display area 1.
The display panel that this application embodiment provided, first electroluminescent device surrounds the display area, first electroluminescent device sets up to the confined round promptly, like this, the crackle that appears in any region in display panel edge can cause the luminescent layer of first electroluminescent device to be corroded by water oxygen and become invalid, thereby the crackle that appears in any region in display panel edge can all be confirmed through whether there is not luminous region in first electroluminescent device, further improve the detection accuracy of display panel edge crackle, avoid lou examining, avoid appearing the risk that display panel encapsulates the inefficacy.
Optionally, the peripheral zone further includes: a driving lead electrically connected to the first electroluminescent device, and a driving input terminal electrically connected to the driving lead; the drive lead includes: a first drive lead electrically connected to the first anode, and a second drive lead electrically connected to the first cathode. In a specific implementation, the driving lead may electrically connect the first electroluminescent device to the driving input terminal, for example, at a lead region 23 as shown in fig. 1.
The display panel provided by the embodiment of the application can provide an electric signal capable of being lightened to the first electroluminescent device in the peripheral area in the crack detection stage, the first electroluminescent device does not need to realize other functions, and the electric signal can be provided to the first electroluminescent device in the peripheral area in the crack detection stage only by driving the input terminal, so that the display panel can realize the autonomous lightening of the first electroluminescent device in the crack detection stage, does not need to use external detection equipment, and is easy to realize.
In an implementation, a width of the first electroluminescent device along a direction of the display area toward the peripheral area may be, for example, 3 mm.
Optionally, the display area comprises a second electroluminescent device 12, and the inorganic encapsulation layer 5 covers the second electroluminescent device 12; the second electroluminescent device 12 comprises: a second anode 13, a second light emitting layer 14, and a second cathode 15 stacked over the base substrate 3;
the second anode 13 and the first anode 6 are disposed in the same layer, the second light-emitting layer 14 and the first light-emitting layer 7 are disposed in the same layer, and the second cathode 15 and the first cathode 8 are disposed in the same layer.
According to the display panel provided by the embodiment of the application, the second anode and the first anode are arranged at the same layer, the second light emitting layer and the first light emitting layer are arranged at the same layer, the second cathode and the first cathode are arranged at the same layer, and each structure in the first electroluminescent device and the structure in the second electroluminescent device at the same layer can be formed by adopting the same material and the same mask plate, so that the process is simple and easy to realize, and the investment cost of the material and the mask plate is not required to be increased.
It should be noted that, in the scheme of sealing the electroluminescent device in the display area by using the inorganic encapsulation layer, if the inorganic encapsulation layer generates a crack in the peripheral area, the crack extending may cause the second light emitting layer in the electroluminescent device in the display area to be corroded by water and oxygen and fail, resulting in the failure of the encapsulation in the display area, affecting the service life of the display panel and affecting the yield of the product. According to the display panel provided by the embodiment of the application, the inorganic packaging layer covers the first electroluminescent device located in the peripheral area and the second electroluminescent device located in the display area, when cracks appear at the edge of the display panel, even if slight cracks appear, whether edge cracks exist in the display panel can be judged according to whether non-luminous areas exist in the first electroluminescent device, and the slight cracks cannot be missed to be detected, so that the detection accuracy of the edge cracks of the display panel can be improved, and the risk of package failure of the display panel is avoided.
As shown in fig. 2, the inorganic encapsulation layer 5 includes: a first inorganic encapsulation layer 16 and a second inorganic encapsulation layer 17, the display panel further comprising: a planarization layer 11, an insulating layer 18 between the planarization layer 11 and the substrate base plate 3, a pixel defining layer 22, a cathode lead layer 19 where the second cathode 15 extends to the peripheral area, a cathode contact layer 20 in the same layer as the second anode and electrically connected to the cathode lead layer, and an organic encapsulation layer 21 between the first inorganic encapsulation layer 16 and the second inorganic encapsulation layer 17. The first electroluminescent device 5 and the second electroluminescent device 12 are located on the planarization layer 11. The first inorganic encapsulation layer 16, the organic encapsulation layer 21 and the second inorganic encapsulation layer 17 also serve to seal the second electroluminescent device 12 in the display area. The display region further includes a thin film transistor electrically connected to the second electroluminescent device, the thin film transistor including: the thin film transistor can be of a top gate structure or a bottom gate structure, and when the thin film transistor is of a top gate structure, the insulating layer can include, for example: buffer layers, gate insulating layers, interlayer insulating layers, protective layers, and the like.
The second electroluminescent device of the display area can comprise a red electroluminescent device, a blue electroluminescent device and a green electroluminescent device, for example.
Based on the same inventive concept, an embodiment of the present application further provides a method for manufacturing a display panel, as shown in fig. 3, the method includes:
s101, providing a substrate base plate;
s102, forming a first electroluminescent device comprising a first anode, a first light-emitting layer and a first cathode which are sequentially stacked on the peripheral area of the substrate base plate;
and S103, forming an inorganic packaging layer on the first electroluminescent device.
According to the display panel manufacturing method provided by the embodiment of the application, as the first electroluminescent device is arranged on the peripheral area, when the edge of the display panel cracks, even if slight cracks occur, a first light-emitting layer in the first electroluminescent device can be corroded by water and oxygen to fail, and the area where the first light-emitting layer fails can not emit light in the process of crack detection, so that whether the edge cracks exist in the display panel can be judged according to whether the area where the first electroluminescent device does not emit light, whether the display panel has packaging failure or not is further judged, and the slight cracks can not be missed to be detected, so that the detection accuracy of the edge cracks of the display panel can be improved. The cracks can also be accurately located according to the areas of the first electroluminescent device that do not emit light.
Optionally, while forming the first electroluminescent device over the peripheral region of the base substrate, the method further comprises: forming a second electroluminescent device in the display region;
forming the first and second electroluminescent devices specifically includes:
forming an anode layer on the substrate, and forming a pattern of a second anode in the display area and a pattern of a first anode in the peripheral area by adopting a patterning process;
forming a pattern of a second light emitting layer over the second anode and a pattern of a first light emitting layer over the first anode;
and forming a cathode layer on the second light-emitting layer and the first light-emitting layer, and forming a pattern of a second cathode in the display area and a pattern of a first cathode in the peripheral area by using a patterning process.
In particular, the patterning process for the anode layer and the cathode layer may include, for example: coating photoresist, exposing, developing, etching and tearing off the photoresist. Specifically, the anode layer may be exposed using a mask as shown in fig. 4, in which the first open regions 24 correspond to regions where patterns of the first anode are formed, and the second open regions 25 correspond to regions where patterns of the second anode are formed. The patterns of the first light-emitting layer and the second light-emitting layer may be formed by, for example, vapor deposition of a light-emitting material using a mask as shown in fig. 5, the fifth opening area 28 corresponding to a region where the pattern of the first light-emitting layer is formed, and the sixth opening area 29 corresponding to a region where the pattern of the light-emitting layer of one color in the second light-emitting layer is formed, or of course, the light-emitting material may be vapor deposited using an open mask having a complete opening in the display area. The cathode layer may be exposed using a mask as shown in fig. 6, the third opened region 26 corresponding to a region where the pattern of the first cathode is formed, and the fourth opened region 27 corresponding to a region where the pattern of the second cathode is formed.
According to the preparation method of the display panel, the structures in the first electroluminescent device and the structures in the same layer in the second electroluminescent device can be formed by adopting the same material and the same mask plate, the process is simple and easy to realize, and the material and mask investment cost do not need to be increased.
Before forming the first electroluminescent device and the second electroluminescent device, the method for manufacturing the display panel provided by the embodiment of the application further includes a step of forming each film layer of the thin film transistor and a planarization layer on the substrate.
Based on the same inventive concept, the embodiment of the present application further provides a crack detection method of a display panel, as shown in fig. 7, the method includes:
s201, respectively providing driving electric signals to a first anode and a first cathode of the first electroluminescent device;
s202, determining the light emitting condition of the first electroluminescent device, and if the first electroluminescent device has a non-light emitting region, determining that the display panel has a crack.
In the method for detecting cracks of a display panel provided by the embodiment of the application, by detecting the light emitting condition of the first electroluminescent device arranged in the peripheral area, if a crack exists in a local area of the first electroluminescent device in the peripheral area, the material of the first light-emitting layer in the electroluminescent device of the corresponding region may fail due to moisture attack, the first electroluminescent device in the local area cannot be lighted under a normal driving signal, the display panel crack detection method provided by the embodiment of the application can detect whether the first luminescent device has an area which does not emit light or not to determine whether the first luminescent layer of the first electroluminescent device has a failure area or not, therefore, whether the edge cracks exist in the display panel is judged, and the slight cracks cannot be missed to be detected, so that the detection accuracy of the edge cracks of the display panel can be improved, and the risk of package failure of the display panel is avoided. The cracks can also be located according to the areas that do not emit light.
Optionally, determining the light emitting condition of the first electroluminescent device specifically includes: determining whether the first electroluminescent device has a non-light emitting region using an Automated Optical Inspection (AOI) system.
According to the display panel crack detection method, whether the electroluminescent device has the non-luminous region or not is observed and checked by utilizing the AOI, so that the detection accuracy of the non-luminous region can be improved, the detection accuracy of the edge crack of the display panel is further improved, and the risk of package failure of the display panel is avoided. The cracks can also be located according to the areas that do not emit light.
According to the display panel crack detection method provided by the application, after the fact that the first electroluminescent device has the non-luminous region is determined, the crack can be accurately positioned, and the reason for generating the crack can be further detected subsequently, so that the crack and the packaging failure can be avoided by optimizing the product structure, the process and the like.
The display device provided by the embodiment of the application comprises the display panel provided by the embodiment of the application.
The display device provided by the embodiment of the application can be a mobile phone, a computer, a television and the like.
In summary, according to the display panel, the manufacturing method thereof, the crack detection method and the display device provided in the embodiment of the present application, because the first electroluminescent device is disposed in the peripheral region, when a crack occurs at an edge of the display panel, even if a slight crack occurs, a first light emitting layer in the first electroluminescent device may be corroded by water and oxygen to fail, and a region where the first light emitting layer fails may not emit light during a crack detection process, so that whether an edge crack exists in the display panel may be determined according to whether a non-light emitting region exists in the first electroluminescent device, and the slight crack may not be missed, so that the detection accuracy of the edge crack of the display panel may be improved, and the risk of package failure of the display panel may be avoided. The cracks can also be located according to the areas that do not emit light.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. The display panel is characterized in that the display panel is divided into a display area and a peripheral area outside the display area; the peripheral zone includes: the substrate comprises a substrate base plate, a first electroluminescent device and an inorganic packaging layer, wherein the first electroluminescent device is positioned on the substrate base plate; the first electroluminescent device includes: the light emitting device includes a first anode, a first light emitting layer, and a first cathode stacked in this order.
2. The display panel according to claim 1, wherein the peripheral region further comprises: a first retaining wall and a second retaining wall; the first retaining wall is located between the first electroluminescent device and the display area, and the second retaining wall is located between the first retaining wall and the first electroluminescent device.
3. The display panel of claim 1, wherein the first electroluminescent device surrounds the display area.
4. The display panel according to claim 1, wherein the peripheral region further comprises: a driving lead electrically connected to the first electroluminescent device, and a driving input terminal electrically connected to the driving lead; the drive lead includes: a first drive lead electrically connected to the first anode, and a second drive lead electrically connected to the first cathode.
5. The display panel of claim 1, wherein the display area comprises a second electroluminescent device, and wherein the inorganic encapsulation layer covers the second electroluminescent device; the second electroluminescent device includes: a second anode, a second light emitting layer, and a second cathode stacked over the base substrate;
the second anode and the first anode are arranged in the same layer, the second light-emitting layer and the first light-emitting layer are arranged in the same layer, and the second cathode and the first cathode are arranged in the same layer.
6. A method for manufacturing a display panel, the method comprising:
providing a substrate base plate;
forming a first electroluminescent device including a first anode, a first light emitting layer, and a first cathode stacked in this order on the peripheral region of the substrate base plate;
an inorganic encapsulation layer is formed over the first electroluminescent device.
7. The method of claim 6, wherein while forming the first electroluminescent device over the peripheral region of the substrate base plate, the method further comprises: forming a second electroluminescent device in the display region;
forming the first and second electroluminescent devices specifically includes:
forming an anode layer on the substrate, and forming a pattern of a second anode in the display area and a pattern of a first anode in the peripheral area by adopting a patterning process;
forming a pattern of a second light emitting layer over the second anode and a pattern of a first light emitting layer over the first anode;
and forming a cathode layer on the second light-emitting layer and the first light-emitting layer, and forming a pattern of a second cathode in the display area and a pattern of a first cathode in the peripheral area by using a patterning process.
8. A crack detection method of a display panel according to any one of claims 1 to 5, characterized in that the method comprises:
providing driving electrical signals to a first anode and a first cathode of the first electroluminescent device, respectively;
and determining the light emitting condition of the first electroluminescent device, and if the first electroluminescent device has an unlit area, determining that the display panel has a crack.
9. The method according to claim 8, wherein determining the light emission of the first electroluminescent device comprises: determining whether there is an area of non-emission of light in the first electroluminescent device using an automated optical detection system.
10. A display device comprising the display panel according to any one of claims 1 to 5.
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