CN117542840B - Display panel and display device - Google Patents
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- CN117542840B CN117542840B CN202311608069.8A CN202311608069A CN117542840B CN 117542840 B CN117542840 B CN 117542840B CN 202311608069 A CN202311608069 A CN 202311608069A CN 117542840 B CN117542840 B CN 117542840B
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- 238000001514 detection method Methods 0.000 claims abstract description 158
- 230000000903 blocking effect Effects 0.000 claims abstract description 73
- 230000004888 barrier function Effects 0.000 claims abstract description 59
- 238000004806 packaging method and process Methods 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims description 44
- 239000007924 injection Substances 0.000 claims description 44
- 238000005538 encapsulation Methods 0.000 claims description 35
- 239000002131 composite material Substances 0.000 claims description 22
- 230000005525 hole transport Effects 0.000 claims description 22
- 238000002955 isolation Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 9
- 230000008859 change Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 230000009545 invasion Effects 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000007641 inkjet printing Methods 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011174 green composite Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
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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
- H01L22/14—Measuring as part of the manufacturing process for electrical parameters, e.g. resistance, deep-levels, CV, diffusions by electrical means
-
- 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
- H01L22/20—Sequence of activities consisting of a plurality of measurements, corrections, marking or sorting steps
-
- 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
- H01L22/32—Additional lead-in metallisation on a device or substrate, e.g. additional pads or pad portions, lines in the scribe line, sacrificed conductors
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The application discloses a display panel and a display device, wherein the display panel comprises a substrate, a light-emitting unit layer, a packaging barrier layer, a first inorganic packaging layer, an organic packaging layer and a second inorganic packaging layer, wherein the first inorganic packaging layer is arranged on the light-emitting unit layer, the organic packaging layer covers the light-emitting unit layer, and the second inorganic packaging layer is arranged on the organic packaging layer; the packaging barrier layer comprises a first barrier structure and a second barrier structure, the second barrier structure is arranged on one side, far away from the display area, of the first barrier structure, a detection structure is arranged between the first barrier structure and the second barrier structure, and the detection structure is used for detecting the amount of water vapor entering the display panel. Through increasing the detection structure between blocking structure, detect the inside steam of display panel, calculate the required compensation degree of the display panel of corresponding region, promote display panel's display effect.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
Organic LIGHT EMITTING Diode (OLED) devices are becoming mature in mass production technology due to the advantages of surface light source, luminescence, energy conservation, fast response, flexibility, ultra-light weight, low cost and the like. The encapsulation technology is particularly critical because of the poor stability of the OLED, which is extremely sensitive to both water and oxygen. The packaging aims to mainly prevent water vapor and oxygen from entering the OLED, cracks are easy to generate in the manufacturing process of the packaging layer, and after the display screen is cracked or external water vapor enters, the aging speed of the OLED organic light-emitting layer device can be accelerated, so that the service life is prolonged and the stability is improved by strictly packaging.
However, even after the severe packaging, the above problems are unavoidable, so that it is necessary to detect the device through some specific detection means, and the failure degree of the device due to external influence can be estimated through the detection result, so as to adjust the display brightness or display mode of the display area, and prolong the service life of the display device through display compensation.
Disclosure of Invention
The application aims to provide a display panel and a display device, wherein a detection structure is added between blocking structures to detect water vapor in the display panel, the compensation degree required by the display panel in a corresponding area is calculated, and the display effect of the display panel is improved.
The application discloses a display panel, which comprises a display area, a non-display area, a substrate, a light-emitting unit layer, a packaging barrier layer, a first inorganic packaging layer, an organic packaging layer and a second inorganic packaging layer, wherein the light-emitting unit layer is arranged on the substrate and is positioned in the display area; the packaging barrier layer is arranged around the light-emitting unit layer and is positioned in the non-display area; the first inorganic packaging layer is arranged on the light-emitting unit layer, extends from the display area to the non-display area and covers the packaging barrier layer; the organic packaging layer is arranged to cover the light-emitting unit layer and is not higher than the packaging barrier layer; the second inorganic packaging layer is arranged on the organic packaging layer, extends from the display area to the non-display area and covers the packaging barrier layer; the packaging barrier layer comprises a first barrier structure and a second barrier structure, the second barrier structure is arranged on one side, far away from the display area, of the first barrier structure, a detection structure is arranged between the first barrier structure and the second barrier structure, and the detection structure is used for detecting the amount of water vapor entering the display panel.
Optionally, the detection structure includes a first detection unit, where the first detection unit includes an organic light emitting layer and two test electrodes, and the organic light emitting layer is disposed between the two test electrodes; the detection structure is used for detecting the resistance or capacitance of the test electrode and judging the water vapor variation in the display panel according to the variation condition of the resistance or capacitance.
Optionally, the organic light-emitting layer includes one or more layers of an electron injection layer, an electron transport layer, a composite light-emitting layer, a hole transport layer and a hole injection layer, and the organic light-emitting layer further includes at least one insulating layer, and the insulating layer is disposed between any two film layers of the electron injection layer, the electron transport layer, the composite light-emitting layer, the hole transport layer and the hole injection layer.
Optionally, the light emitting unit layer includes a plurality of light emitting units, the light emitting units including a cathode, an anode, and an organic light emitting layer; the organic light emitting layer of the light emitting unit is identical to the organic light emitting layer of the first detecting unit in height.
Optionally, the organic light emitting layer of the first detection unit includes an electron injection layer, an electron transport layer, a composite light emitting layer, a hole transport layer, and a hole injection layer; the organic light-emitting layer of the light-emitting unit comprises an electron injection layer, an electron transport layer, a composite light-emitting layer, a hole transport layer and a hole injection layer; the heights of the film layers in the electron injection layer, the electron transport layer, the composite luminescent layer, the hole transport layer and the hole injection layer of the first detection unit are respectively consistent with those of the film layers in the electron injection layer, the electron transport layer, the composite luminescent layer, the hole transport layer and the hole injection layer of the luminescent unit.
Optionally, the detection structure further includes a second detection unit, a third detection unit, and an isolation column, where the isolation column is disposed between the first detection unit, the second detection unit, and the third detection unit, and is used to isolate the first detection unit, the second detection unit, and the third detection unit; the organic light-emitting layer of the first detection unit is a first organic light-emitting layer, the organic light-emitting layer of the second detection unit is a second organic light-emitting layer, and the organic light-emitting layer of the third detection unit is a third organic light-emitting layer; the first organic light emitting layer, the second organic light emitting layer, and the third organic light emitting layer are different in color.
Optionally, a plurality of detection structures are arranged between the first blocking structure and the second blocking structure, and the plurality of detection structures respectively comprise the first detection unit, the second detection unit and the third detection unit; and gaps are arranged between the adjacent detection structures, and the gaps are between 100um and 500 um.
Optionally, the non-display area includes a plurality of detection areas, and the detection structure is disposed between the first blocking structure and the second blocking structure in each detection area.
Optionally, the non-display area is disposed around the display area, the non-display area has four angular positions, at least one detection area is disposed at each angular position of the non-display area, and at least one detection area is disposed at each edge of the non-display area.
The application also discloses a display device which comprises the driving circuit and the display panel, wherein the driving circuit is used for driving the display panel to display.
According to the application, the detection structure is arranged between the first blocking structure and the second blocking structure, the real-time water vapor invasion condition of the display panel is judged through the detection structure, and the compensation strategy of the light-emitting unit at the corresponding position can be adjusted according to the curve change of the detection result, so that the display effect of the display panel can be improved. In particular, the first blocking structure and the second blocking structure are arranged between the substrate and the first inorganic packaging layer, the interface between the substrate and the film layer of the first inorganic packaging layer is also one of the areas which are most easy to invade by water vapor, the application arranges the detection structure between the first blocking structure and the second blocking structure, on one hand, the space between the first blocking structure and the second blocking structure is utilized, on the other hand, the second blocking structure is positioned between the substrate and the film interface of the first inorganic packaging layer, so that whether water vapor invades the display panel or not and the concentration change of the water vapor invaded the display panel can be reflected, the detection data is more accurate, the follow-up compensation data is more accurate, and the service life of the display panel is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is evident that the figures in the following description are only some embodiments of the application, from which other figures can be obtained without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a display panel of the present application;
FIG. 2 is a schematic diagram of a first detection configuration of the present application;
FIG. 3 is a schematic view of a second display panel of the present application;
FIG. 4 is a schematic diagram of a second detection configuration of the present application;
FIG. 5 is a schematic diagram of a third detection configuration of the present application;
FIG. 6 is a schematic diagram of a fourth detection configuration of the present application;
FIG. 7 is a schematic distribution diagram of a first detection structure of the present application;
FIG. 8 is a schematic distribution diagram of a second detection structure of the present application;
Fig. 9 is a schematic view of a display device of the present application.
100 Parts of a display panel; 101. a display area; 102. a non-display area; 103. a substrate; 104. a light emitting unit layer; 110. packaging the barrier layer; 111. a first blocking structure; 112. a second blocking structure; 113. a third blocking structure; 120. a first inorganic encapsulation layer; 121. an organic encapsulation layer; 122. a second inorganic encapsulation layer; 130. a detection structure; 131. a first detection unit; 132. a second detection unit; 133. a third detection unit; 134. a separation column; 136. a test electrode; 150. an organic light emitting layer; 151. an electron injection layer; 152. an electron transport layer; 153. a composite light emitting layer; 154. a hole transport layer; 155. a hole injection layer; 156. an insulating layer; 200. a display device; 210. and a driving circuit.
Detailed Description
It is to be understood that the terminology used herein, the specific structural and functional details disclosed are merely representative for the purpose of describing particular embodiments, but that the application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or implicitly indicating the number of technical features indicated. Thus, unless otherwise indicated, features defining "first", "second" may include one or more such features either explicitly or implicitly; the meaning of "plurality" is two or more. In addition, terms of the azimuth or positional relationship indicated by "upper", "lower", "left", "right", "vertical", "horizontal", etc., are described based on the azimuth or relative positional relationship shown in the drawings, and are merely for convenience of description of the present application, and do not indicate that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The application is described in detail below with reference to the attached drawings and alternative embodiments.
Fig. 1 is a schematic view of a display panel of the present application, and referring to fig. 1, the present application discloses a display panel 100, wherein the display panel 100 includes a display area 101 and a non-display area 102, the display panel 100 further includes a substrate 103, a light emitting unit layer 104, an encapsulation barrier layer 110, a first inorganic encapsulation layer 120, an organic encapsulation layer 121, and a second inorganic encapsulation layer 122, the light emitting unit layer 104 is disposed on the substrate 103 and is located in the display area 101; the encapsulation barrier 110 is disposed around the light emitting unit layer 104 and located in the non-display area 102; the first inorganic encapsulation layer 120 is disposed on the light emitting unit layer 104, extends from the display region 101 to the non-display region 102, and covers the encapsulation barrier layer 110; the organic encapsulation layer 121 is disposed to cover the light emitting unit layer 104 and is not higher than the encapsulation barrier layer 110; and the second inorganic encapsulation layer 122 is disposed on the organic encapsulation layer 121, extends from the display region 101 to the non-display region 102, and covers the encapsulation barrier 110; the packaging barrier layer 110 includes a first barrier structure 111 and a second barrier structure 112, the second barrier structure 112 is disposed on a side of the first barrier structure 111 away from the display area 101, a detection structure 130 is disposed between the first barrier structure 111 and the second barrier structure 112, and the detection structure 130 is used for detecting an amount of water vapor entering the display panel 100.
According to the application, the detection structure 130 is arranged between the first blocking structure 111 and the second blocking structure 112, the real-time water vapor invasion condition of the display panel 100 is judged through the detection structure 130, and the compensation strategy of the light emitting units at the corresponding positions can be adjusted according to the curve change of the detection result, so that the display effect of the display panel 100 can be improved. Specifically, the first blocking structure 111 and the second blocking structure 112 are disposed between the substrate 103 and the first inorganic packaging layer 120, and the film interface between the substrate 103 and the first inorganic packaging layer 120 is also one of the areas where water vapor is most likely to invade, and the present application sets the detection structure 130 between the first blocking structure 111 and the second blocking structure 112, on the one hand, by using the space between the first blocking structure 111 and the second blocking structure 112, and on the other hand, by using the second blocking structure 112 being located between the substrate 103 and the film interface of the first inorganic packaging layer 120, it is most possible to embody whether water vapor invades into the display panel 100, and the concentration change of the water vapor invading the display panel 100, so that the detection data is more accurate, the subsequent compensation data is more accurate, and the service life of the display panel 100 is prolonged.
It is understood that the water vapor detection mentioned in the present application refers to that the light emitting unit of the display area 101 of the display panel 100 affects the light emitting efficiency of the light emitting unit after being invaded by water vapor, except for the case that the light emitting unit is completely disabled due to the too high water vapor concentration. For example, in the process of manufacturing the OLED display panel 100, some unavoidable protruding small particles (particles) are already present on the surface of the film layer before plating the cathode in the light emitting unit, because the cathode metal layer is thin, the protruding small particles are enough to pierce the cathode to cause pinholes in the cathode metal layer, because the inorganic film layer represented by silicon oxynitride cannot be made thick, and the particles are not uniform in size, so some particles may still not be completely covered after the inorganic encapsulation layer is encapsulated and partially exposed, and some small particles may form pinholes after being covered. Pinholes and bare particles exist on the surface of the inorganic packaging layer film, tiny cracks exist on the film around the particles, the strength and the tightness of the film are reduced due to the pinholes and the cracks, when Fang Guhua acrylic organic packaging layers 121 are arranged on the film, the pinholes and the cracks are filled with acrylic, and a water vapor path is directly invaded along the interfaces, so that the device is directly failed. The failure of the common packaging layer is changed and deepened in real time, and the characteristics of different regionalities exist, when the packaging fails, the damage caused by the device is different, and the influence degree on display is also different.
Generally, when the packaging layer has problems, the amount of water vapor invasion is small, the influence on the light emission of the light emitting unit is limited, but the problems of inaccurate gray scale of the light emitted by the light emitting unit and the like are caused. The compensation of different degrees can be carried out according to the failure degree of the device, and the display effect can be improved or the service life can be prolonged. It should be noted that, in some types of display panels 100, a driving layer may be disposed between the substrate 103 and the first inorganic package layer 120, the first inorganic package layer 120 contacts the driving layer, the first blocking structure 111 is disposed on the driving layer, the detecting structure 130 is also disposed on the driving layer, and the electrical signal transmission related to the detecting structure 130 may also be implemented through the driving layer.
Fig. 2 is a schematic diagram of a first detection structure of the present application, referring to fig. 2, the detection structure 130 of the present application includes a first detection unit 131, where the first detection unit 131 includes an organic light emitting layer 150 and two test electrodes 136, the organic light emitting layer 150 is disposed between the two test electrodes 136, and the detection structure 130 is configured to detect a resistance or a capacitance of the test electrodes 136, and determine an amount of moisture change in the display panel 100 according to a change of the resistance or the capacitance.
In the application, by disposing the organic light emitting layer 150 between the first blocking structure 111 and the second blocking structure 112, when the organic light emitting layer 150 fails without being affected by moisture, the resistance or capacitance value on the test electrode 136 is unchanged, and may be a preset value, where the magnitude of the preset value is related to the size, distance, material of the organic light emitting layer 150, and the like of the test electrode 136. After the organic light emitting layer 150 is invaded by moisture, the organic light emitting layer 150 is changed under the influence of moisture, and the resistance or capacitance value of the organic light emitting layer is also changed correspondingly. In actual operation, the change value of the resistance or capacitance of the organic light emitting layer 150 after the water vapor having different degrees invades can be measured in advance, and in the subsequent actual detection, the influence degree of the water vapor can be calculated according to the actually measured capacitance and resistance change of the detection structure 130, so as to realize the function of detecting the water vapor.
The light emitting unit layer 104 includes a plurality of light emitting units including a cathode, an anode, and an organic light emitting layer; the organic light emitting layer of the light emitting unit and the organic light emitting layer 150 of the first detecting unit 131 are identical in height. That is, the organic light emitting layer 150 within the detection structure 130 may be in high agreement with the organic light emitting layer in the light emitting unit within the display area 101.
In this embodiment, since different intrusion risks exist due to different heights of the organic light emitting layer 150 from the substrate 103, in order to reduce the influence of other factors as much as possible, that is, the same organic light emitting layer 150 is disposed in the non-display area 102 to reflect the intrusion condition of the organic light emitting layer 150 in the display area 101 by moisture, so that the detection structure 130 is more accurate.
The packaging layer generally has a stacked structure of an inorganic packaging layer and an organic packaging layer 121, and at least two inorganic packaging layers are sandwiched between two sides of the organic packaging layer 121 to realize packaging of the light emitting unit layer 104. The function of the encapsulation layer is mainly to prevent water vapor and oxygen from entering the light emitting unit layer 104, and prevent the organic light emitting layer 150 in the light emitting unit layer 104 from being disabled after being contacted by water and oxygen, so that the sealing effect of the encapsulation layer is very important for the display panel 100, and is also a vital link in the manufacturing process of the OLED display panel 100. The inorganic encapsulation layer is generally prepared by vacuum deposition, and the organic encapsulation layer 121 is prepared by inkjet printing. Because there is a gap between the printheads in the inkjet printing, the organic encapsulation layer 121 in the inkjet printing needs to be completely tiled on the light emitting unit layer 104 by a static leveling manner to form a covering encapsulation. While the structure for blocking the flow of ink is generally referred to as an encapsulation barrier layer 110, the encapsulation barrier layer 110 is generally disposed on the non-display region 102, above the surface of the light emitting cell layer 104.
In this embodiment, the first blocking structure 111 and the second blocking structure 112 in the display panel 100 are generally track-shaped, the first blocking structure 111 is disposed around the display area 101, and the second blocking structure 112 is disposed around the first blocking structure 111. The second blocking structure 112 may be disposed higher than the first blocking structure 111 such that the height of the organic encapsulation layer 121 does not exceed the second blocking structure 112, and the organic encapsulation layer 121 is blocked by the second blocking structure 112.
Fig. 3 is a schematic view of a second display panel according to the present application, as shown in fig. 3, on the basis of the display panel 100, the encapsulation barrier layer 110 may further include a third barrier structure 113, where the third barrier structure 113 is disposed around the second barrier structure 112, and the height of the third barrier structure 113 is higher than the heights of the second barrier structure 112 and the first barrier structure 111, and the heights of the first barrier structure 111 and the second barrier structure 112 are not limited herein, and the organic encapsulation layer 121 is blocked mainly by the third barrier structure 113.
In yet another embodiment, the number of barrier structures of the encapsulation barrier 110 is not limited to three, and the heights of the barrier structures may be sequentially increased or sequentially decreased along the direction in which the display region 101 extends toward the non-display region 102. Wherein the detecting structure 130 may be arranged close to the display area 101, for example, a blocking structure is always arranged with the display area 101, i.e. a blocking structure is always arranged between the blocking structure provided with the detecting structure 130 and the display area 101. Therefore, the distance between the detection structure 130 and the display area 101 is not too far, and the water vapor invasion condition of the display area 101 can be accurately expressed.
Fig. 4 is a schematic diagram of a second detection structure of the present application, referring to fig. 4, in the non-display area 102, a first detection unit 131 includes an organic light emitting layer 150 and two test electrodes 136, and the organic light emitting layer 150 is disposed between the two test electrodes 136; the detecting structure 130 is configured to detect the resistance or capacitance of the test electrode 136, and determine the change of water vapor in the display panel 100 according to the change of the resistance or capacitance. The organic light emitting layer 150 includes one or more of an electron injection layer 151, an electron transport layer 152, a recombination light emitting layer 153, a hole transport layer 154, and a hole injection layer 155.
In this embodiment, the first detecting unit 131 disposed between the first blocking structure 111 and the second blocking structure 112 has the same organic light emitting layer 150 as the light emitting unit disposed in the display area 101, and the layers of the electron injection layer 151, the electron transport layer 152, the composite light emitting layer 153, the hole transport layer 154 and the air injection layer are in the same order, so as to further show the intrusion degree of moisture from the light emitting unit in the display area 101 at different positions. In contrast, in the present embodiment, the test electrode 136 is driven to drive the organic light emitting layer 150 to emit light, and the test electrode 136 is used to input a test signal to detect the light emitting brightness of the light emitting units with different moisture invasion degrees during the test process, so as to calculate the required compensation voltage.
In another embodiment, the brightness of the light emitting units after the intrusion of the water vapor with different degrees is considered to be tested according to the special light emitting units, and the problem that the first detecting unit 131 can emit light by mistake in the use of the user after the shipment of the display panel 100 is prevented. In this aspect, the organic light emitting layer 150 further includes at least one insulating layer 156, and the insulating layer 156 is disposed between any two film layers of the electron injection layer 151, the electron transport layer 152, the composite light emitting layer 153, the hole transport layer 154, and the hole injection layer 155. By using the insulating layer 156, at least two adjacent film layers in the organic light emitting layer 150 in the first detecting unit 131 cannot transport holes or electrons, so that the organic light emitting layer 150 cannot emit light under the driving of the test electrode 136.
Specifically, the organic light emitting layer 150 of the first detecting unit 131 includes an electron injection layer 151, an electron transport layer 152, a composite light emitting layer 153, a hole transport layer 154, and a hole injection layer 155; the organic light-emitting layer of the light-emitting unit comprises an electron injection layer, an electron transport layer, a composite light-emitting layer, a hole transport layer and a hole injection layer; an insulating layer 156 may be disposed between the layers in the organic light emitting layer 150 in the first detection unit 131, but after the insulating layer is disposed, the heights of the layers in the electron injection layer 151, the electron transport layer 152, the composite light emitting layer 153, the hole transport layer 154, and the hole injection layer 155 in the first detection unit 131 are respectively identical to those of the layers in the electron injection layer, the electron transport layer, the composite light emitting layer, the hole transport layer, and the hole injection layer in the light emitting unit.
In this embodiment, even if the insulating layer 156 is added, each layer of the organic light emitting layer 150 in the detection unit still needs to be kept consistent with the layer height in the organic light emitting layer of the light emitting unit of the display area 101, and the same position has the degree of being invaded by moisture under multiple layers.
Taking the second blocking structure 112 as an example, the height of the second blocking structure 112 is slightly higher than that of the light emitting unit layer 104, and the organic light emitting layer 150 of the first detection unit 131 disposed between the first blocking structure 111 and the second blocking structure 112 is identical to that of the light emitting unit layer 104.
Fig. 5 is a schematic view of a third detection structure of the present application, referring to fig. 5, in the non-display area 102, the detection structure 130 includes a first detection unit 131, a second detection unit 132, a third detection unit 133, and an isolation column 134, the isolation column 134 being disposed between the first detection unit 131, the second detection unit 132, and the third detection unit 133, for isolating the first detection unit 131, the second detection unit 132, and the third detection unit 133; the organic light emitting layer 150 of the first detecting unit 131 is a first organic light emitting layer 150, the organic light emitting layer 150 of the second detecting unit 132 is a second organic light emitting layer 150, and the organic light emitting layer 150 of the third detecting unit 133 is a third organic light emitting layer 150; the colors of the first organic light emitting layer 150, the second organic light emitting layer 150, and the third organic light emitting layer 150 are different.
In this embodiment, in each detection structure 130, a first detection unit 131, a second detection unit 132, and a third detection unit 133 are respectively disposed and separated by a spacer 134, wherein the first organic light-emitting layer 150 of the first detection unit 131 is a red light-emitting layer, the second organic light-emitting layer 150 of the second detection unit 132 is a green light-emitting layer, and the third organic light-emitting layer 150 of the third detection unit 133 is a blue light-emitting layer. The first detecting unit 131 and the display area 101 in this embodiment correspond to a red light emitting unit, which reflects the degree of moisture intrusion received by the red light emitting unit, the second detecting unit 132 may reflect the degree of moisture intrusion received by the green light emitting unit, and the third detecting unit 133 may reflect the degree of moisture intrusion received by the blue light emitting unit. In contrast, the red light emitting unit, the green light emitting unit and the blue light emitting unit have different light emitting efficiency under the intrusion of water vapor of different degrees, so that the light emitting units of different colors need to be detected respectively, and the adjustment of different compensation coefficients of the red light emitting unit, the green light emitting unit and the blue light emitting unit can be realized respectively through the functions of the first detection unit 131, the second detection unit 132 and the third detection unit 133.
It can be understood that the first, second and third detecting units 131, 132 and 133 include an organic light emitting layer 150 and two test electrodes 136, respectively, the organic light emitting layer 150 being disposed between the two test electrodes 136; the organic light emitting layer 150 includes an electron injection layer 151, an electron transport layer 152, a recombination light emitting layer 153, a hole transport layer 154, and a hole injection layer 155. The first detection unit 131 corresponds to the red composite light emitting layer 153, the second detection unit 132 corresponds to the green composite light emitting layer 153, and the third detection unit 133 corresponds to the blue composite light emitting layer 153.
Specifically, the thickness of the insulating layer 156 is about 0.5um, and the area of the organic light emitting layer 150 in each detection unit may be equal to or greater than the area of the organic light emitting layer 150 of the light emitting unit of the display area 101.
In another embodiment, the organic light emitting layer 150 in the detection unit may also be a multi-layered electron injection layer 151 or electron transport layer 152 or composite light emitting layer 153 or hole transport layer 154 or hole injection layer 155, etc., which may not be limited herein.
Fig. 6 is a schematic view of a fourth detection structure of the present application, referring to fig. 6, a plurality of detection structures 130 are disposed between the first blocking structure 111 and the second blocking structure 112, and a plurality of detection structures 130 respectively include the first detection unit 131, the second detection unit 132, and the third detection unit 133; the first detecting unit 131, the second detecting unit 132, and the third detecting unit 133 may be the first detecting unit 131, the second detecting unit 132, and the third detecting unit 133 in the above-described embodiments. A gap is provided between adjacent detection structures 130, and the gap is between 100um and 500 um.
In this embodiment, the four detecting structures 130 may be formed, for example, where the intervals between the four detecting structures 130 in turn are H1, H2, and H3, respectively. Where h1=h2=h3 or H1, H2, H3 increases or decreases at a distance. When h1=h2=h3, the value thereof may be set to 100um to 500um. When H1, H2, and H3 are different, h1=100 um, h2=200 um, and h3=300 um may be set, and the increasing or decreasing amplitude may be within 50 um-200 um, and according to the size of the actual packaging frame, the number of each blocking structure including the detecting structure 130 and the specific values of H1, H2, and H3 may be specifically set. According to the change of the resistance or capacitance value of the device of the detection structure 130 under the condition that different detection units fail in the same package, the relationship curve of the failure degree and the distance can be calculated.
In another aspect, the above-mentioned detection structure may also be disposed in the first blocking structure or the second blocking structure, and the detection structure is disposed in a manner of forming a groove or a through groove in the blocking structure, so as to save the space of the edge.
Fig. 7 is a schematic distribution diagram of a first detection structure of the present application, and referring to fig. 7, the non-display area 102 includes a plurality of detection areas, and the detection structure 130 is disposed between the first blocking structure 111 and the second blocking structure 112 in each detection area.
Considering that the second blocking structure 112 is designed to be a surrounding type, if the detecting structure 130 is disposed at each position between the first blocking structure and the second blocking structure 112, more waste is necessarily caused, and therefore, only the display area 101 and the non-display area 102 need to be divided into areas, and one or more detecting structures 130 need to be disposed for each area.
In an embodiment, the non-display area 102 is disposed around the display area, the non-display area has four angular positions, at least one detection area is disposed at each angular position of the non-display area 102, and at least one detection area is disposed at each side of the non-display area 102. That is, eight detection areas T1-T8 (T1, T3, T5, T7 respectively correspond to the angular positions, and T2, T3, T4, T8 respectively correspond to the four sides) are disposed around the display area 101, and one or more detection structures 130 may be disposed in each detection area, and the plurality of detection structures 130 are described in the foregoing embodiments and will not be described herein again.
Further, dividing the display area 101, taking the width of the display area 101 as m×n as an example, assuming that M < N, dividing the length of the display area 101 into three parts, a1=m/4, b=m/2, a2=m/4, dividing the width into three parts, c1=n/4, d=n/2, c2=n/4, and dividing the width into eight areas respectively AT1-AT8, taking AT1 as an example, adjusting the light emitting unit in AT1 by taking T1, and estimating the water vapor invasion degree according to the curve relationship between the water vapor invasion degree and the distance obtained by T1-T8 in a compensation mode of each area, wherein the water vapor invasion degree AT the boundary of different areas is estimated by the calculated average value of the two areas.
Fig. 8 is a schematic distribution diagram of a second detection structure according to the present application, referring to fig. 8, in another embodiment, four corner positions of the display area 101 are arranged in a quarter circle on the basis of the above description, and since the package is prone to fail at four corners, the location where the main failure occurs is generally a region extending inward from four corners, the degree of failure in the middle region is smaller or substantially the same, and the degree of failure extension is generally equal, so the present disclosure focuses on the division manner of the four corner regions.
After estimating the different failure degrees of the real-time display area 101 according to the above proposal, display compensation can be performed according to the actual situation. Specifically, if the display device focuses on the display effect after failure, after the device fails, the display area 101 may have a corresponding display abnormality, such as insufficient brightness or color shift, so that in order to improve the quality of the display after failure, the driving voltages of different areas may be correspondingly improved to improve the display quality, and meanwhile, the block compensation may improve the overall display uniformity. If the display device is more concerned with prolonging the display life after failure, the aging of the device is faster when the same voltage is used after the device fails, so that the brightness of the whole white picture can be reduced according to actual conditions, and different voltage values can be reduced according to failure conditions of different areas so as to prolong the service life of the device.
Specifically, the adjustment strategy, for example, the water vapor concentration level is first-order, adjusts the compensation parameters of the nearest row of light emitting units, for example, the water vapor concentration level is second-order, adjusts the compensation coefficients of the nearest row of light emitting units and the next nearest row of light emitting units, wherein the compensation coefficient of the nearest light emitting unit is larger than the compensation coefficient of the next nearest light emitting unit, and performs compensation by adopting the step compensation coefficient. The present embodiment provides only an example of a compensation scheme, and is not limited thereto, and the compensation scheme may be selected according to actual situations.
Fig. 9 is a schematic diagram of a display device according to the present application, and referring to fig. 9, the present application discloses a display device, wherein a display device 200 includes the display panel 100 and a driving circuit 210, and the driving circuit 210 is used for driving the display panel 100 to display. The display panel 100 in the present embodiment is an organic light emitting display panel 100.
According to the application, the detection structure 130 is arranged between the first blocking structure 111 and the second blocking structure 112, the real-time water vapor invasion condition of the display panel 100 is judged through the detection structure 130, and the compensation strategy of the light emitting units at the corresponding positions can be adjusted according to the curve change of the detection result, so that the display effect of the display panel 100 can be improved. Specifically, the second blocking structure 112 is disposed between the substrate 103 and the first inorganic packaging layer 120, and the film interface between the substrate 103 and the first inorganic packaging layer 120 is one of the areas where water vapor is most likely to invade, and the present application sets the detection structure 130 between the first blocking structure 111 and the second blocking structure 112, on the one hand, by using the space between the first blocking structure 111 and the second blocking structure 112, and on the other hand, by using the space between the first blocking structure 111 and the second blocking structure 112, which is located between the substrate 103 and the film interface of the first inorganic packaging layer 120, it is most possible to embody whether water vapor invades into the display panel 100, and the concentration change of water vapor invading the display panel 100, etc., so that the detection data is more accurate, which is beneficial to the more accurate following compensation data, thereby prolonging the service life of the display panel 100.
It should be noted that, the inventive concept of the present application can form a very large number of embodiments, but the application documents are limited in space and cannot be listed one by one, so that on the premise of no conflict, the above-described embodiments or technical features can be arbitrarily combined to form new embodiments, and after the embodiments or technical features are combined, the original technical effects will be enhanced.
The above description of the application in connection with specific alternative embodiments is further detailed and it is not intended that the application be limited to the specific embodiments disclosed. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the application, and these should be considered to be within the scope of the application.
Claims (10)
1. A display panel comprising a display area and a non-display area, the display panel comprising:
A substrate;
A light emitting unit layer disposed on the substrate and located in the display region;
The packaging barrier layer is arranged around the light-emitting unit layer and is positioned in the non-display area;
The first inorganic packaging layer is arranged on the light-emitting unit layer, extends from the display area to the non-display area and covers the packaging barrier layer;
an organic encapsulation layer, which is arranged to cover the light emitting unit layer and is not higher than the encapsulation barrier layer; and
A second inorganic encapsulation layer disposed on the organic encapsulation layer, extending from the display region to the non-display region, and covering the encapsulation barrier layer;
the packaging barrier layer comprises a first barrier structure and a second barrier structure, the second barrier structure is arranged on one side, far away from the display area, of the first barrier structure, a detection structure is arranged between the first barrier structure and the second barrier structure, and the detection structure is used for detecting the amount of water vapor entering the display panel.
2. The display panel according to claim 1, wherein the detection structure comprises a first detection unit including an organic light emitting layer and two test electrodes, the organic light emitting layer being disposed between the two test electrodes;
The detection structure is used for detecting the resistance or capacitance of the test electrode and judging the water vapor variation in the display panel according to the variation condition of the resistance or capacitance.
3. The display panel according to claim 2, wherein the organic light-emitting layer includes one or more of an electron injection layer, an electron transport layer, a composite light-emitting layer, a hole transport layer, and a hole injection layer, and the organic light-emitting layer further includes at least one insulating layer disposed between any two film layers of the electron injection layer, the electron transport layer, the composite light-emitting layer, the hole transport layer, and the hole injection layer.
4. The display panel according to claim 3, wherein the light emitting unit layer includes a plurality of light emitting units including a cathode, an anode, and an organic light emitting layer;
The organic light emitting layer of the light emitting unit is identical to the organic light emitting layer of the first detecting unit in height.
5. The display panel according to claim 4, wherein the organic light-emitting layer of the first detection unit includes an electron injection layer, an electron transport layer, a composite light-emitting layer, a hole transport layer, and a hole injection layer;
The organic light-emitting layer of the light-emitting unit comprises an electron injection layer, an electron transport layer, a composite light-emitting layer, a hole transport layer and a hole injection layer;
the heights of the film layers in the electron injection layer, the electron transport layer, the composite luminescent layer, the hole transport layer and the hole injection layer of the first detection unit are respectively consistent with those of the film layers in the electron injection layer, the electron transport layer, the composite luminescent layer, the hole transport layer and the hole injection layer of the luminescent unit.
6. The display panel according to claim 2, wherein the detection structure further includes a second detection unit, a third detection unit, and an isolation column provided between the first detection unit, the second detection unit, and the third detection unit for isolating the first detection unit, the second detection unit, and the third detection unit;
The organic light-emitting layer of the first detection unit is a first organic light-emitting layer, the organic light-emitting layer of the second detection unit is a second organic light-emitting layer, and the organic light-emitting layer of the third detection unit is a third organic light-emitting layer;
The first organic light emitting layer, the second organic light emitting layer, and the third organic light emitting layer are different in color.
7. The display panel according to claim 6, wherein a plurality of detection structures are provided between the first blocking structure and the second blocking structure, the plurality of detection structures respectively including the first detection unit, the second detection unit, and the third detection unit;
and gaps are arranged between the adjacent detection structures, and the gaps are between 100um and 500 um.
8. The display panel of claim 1, wherein the non-display region comprises a plurality of detection regions, the detection structure being disposed between a first blocking structure and a second blocking structure within each detection region.
9. The display panel of claim 8, wherein the non-display area is disposed around the display area, at least one detection area is disposed at each angular position of the non-display area, and at least one detection area is disposed on each side of the non-display area.
10. A display device comprising a drive circuit and the display panel of any one of claims 1-9, wherein the drive circuit is configured to drive the display panel to display.
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| CN107068715B (en) * | 2017-03-28 | 2019-12-20 | 上海天马微电子有限公司 | Organic light-emitting display panel, organic light-emitting display device and preparation method of organic light-emitting display panel |
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| KR20230135419A (en) * | 2022-03-16 | 2023-09-25 | 주식회사 원익아이피에스 | A batch-type substrate processing system capable of measuring and controlling the humidity of a substrate storage space |
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