Patent ID: 12193309

DETAILED DESCRIPTION OF EMBODIMENTS

The technical scheme in the embodiment of the application will be described clearly and completely below in combination with the accompanying drawings in the embodiment of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all of the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the application and are not used to limit the application. In the present application, in the absence of a contrary explanation, the location words used, such as “up” and “down”, usually refer to the up and down under the actual use or working state of the device, specifically the drawing direction in the attached drawings; The “inside” and “outside” are for the contour of the device.

Embodiments of the present application provides an organic light-emitting diode (OLED) display panel and an electronic device. These are described in detail below. It should be noted that an order of descriptions of the following embodiments is not a limitation on a preferred order of the embodiments.

The present application provides the OLED display panel, which comprises a main display part and a first organic packaging layer. The main display part has a display area and a non-display area disposed around the display area. The first organic packaging layer is disposed on the main display part, wherein the first organic packaging layer comprises a first organic packaging section, the first organic packaging section is located in the non-display area, and the first organic packaging section comprises water absorbent.

Therefore, in the present application, by setting the first organic packaging section in the non-display area of the OLED display panel, since the first organic packaging section contains water absorbent, when external water vapor invade the non-display area in the main display part, the water absorbent in the first organic packaging section can effectively absorb part of the water vapor, which can delay a time of a water vapor intrusion, reduce a probability of a water vapor intrusion to the display area, and help to improve life of the OLED display panel.

The OLED display panel provided by the present application will be described in detail through specific embodiments.

Referring toFIG.1, a first embodiment of the present application provides the OLED display panel100. The OLED display panel100comprises the main display part10and the first organic packaging layer20. The main display part10has the display area10A and the non-display area10B disposed around the display area10A. The first organic packaging layer20is disposed on the main display part10. The first organic packaging layer20comprises the first organic packaging section21. The first organic packaging section21is located in the non-display area10B. The first organic packaging section21comprises the water absorbent211.

Specifically, the main display part10comprises a driving substrate11, a light-emitting layer12, and a first electrode13arranged in sequence.

Wherein, the driving substrate11can be a thin film transistor substrate. The thin film transistor substrate comprises a substrate and a thin film transistor device (not shown in drawings) disposed on the substrate, and it can be understood that related technologies are the prior art and will not be repeated here.

The light-emitting layer12is located in the display area10A. The first electrode13covers the light-emitting layer12. The first electrode13extends from the display area10A to the non-display area10B. Wherein, the first electrode13can be an anode or a cathode. In the present embodiment, the first electrode13is the cathode, in this case, the anode (not shown in the drawings) is arranged on one side of the driving substrate11close to the light-emitting layer12, and it can be understood that related technologies are the prior art and will not be repeated here.

It should be noted that only a structure of the light-emitting layer12is shown in the drawings of the present application for the convenience of describing various embodiments, the OLED display panel of the present application also comprises a plurality of array arranged light-emitting devices (not shown in the drawings), wherein the light-emitting devices are composed of the anode, the light-emitting layer and the cathode, and it can be understood that related technologies are the prior art and will not be repeated here.

In the present embodiment, the first organic packaging section21is disposed on the driving substrate11. The first organic packaging section21is located on one side of the first electrode13away from the display area10A. Since the first organic packaging section21in the present embodiment is located outside the first electrode13, when the external water vapor invades the non-display area10B, it will first enter the first organic packaging section21. Since the water absorbent211in the first organic packaging section21can absorb the invaded water vapor, which can delay the time of the water vapor intrusion to the display area10A, thus to reduce a probability that the cathode is corroded by the external water vapor, thereby reducing a failure probability of the light-emitting devices, and improving life of the OLED display panel100.

In the present embodiment, the water absorbent211is uniformly dispersed into the first organic packaging section21. Specifically, the water absorbent211comprises one or more of calcium sulfide, calcium chloride, silica gel, and activated alumina. Further, in the present embodiment, the first organic packaging section21also comprises packaging materials, which can comprise epoxy resin or acrylic resin.

In some embodiments, a mass content of the water absorbent211in the first organic packaging section21gradually increases from the display area10A to a direction towards the non-display area10B. In the above arrangement, the closer a position to the display area10A, the smaller the mass content of the water absorbent211in the first organic packaging section21. Therefore, while improving a packaging effect of the non-display area10B, the above arrangement can also reduce an influence of the water absorbent211close to the display area10A in the first organic packaging section21on a display effect of edge areas of the light-emitting layer12.

The first organic packaging layer20also comprises a second organic packaging section22. The second organic packaging section22is disposed on the driving substrate11. The second organic packaging section22covers the first electrode13and is connected to a surface of the first organic packaging section21close to the display area10A. Wherein, the second organic packaging section22comprises packaging materials, which can comprise the epoxy resin or the acrylic resin.

In the present embodiment, the second organic packaging section22does not contain the water absorbent211, that is, the water absorbent211exists only in the non-display area10B. Therefore, compared with a packaging structure containing water absorbent211in the display area10A, on the one hand, the present embodiment does not need to consider an influence of the water absorbent211on a light output effect of the display area10A. On the other hand, the present embodiment has low requirements on types of the water absorbent211, the mass content of the water absorbent211in the first organic packaging section21, and a dispersion degree of the water absorbent211in the first organic packaging section21, which can effectively reduce a process preparation difficulty of the first organic packaging section21, so as to reduce a process manufacturing cost.

Further, the packaging materials in the first organic packaging section21are the same as the packaging materials in the second organic packaging section22, such as the epoxy resin. On the one hand, the above arrangement can improve a compatibility between the packaging materials in the first organic packaging section21and the packaging materials in the second organic packaging section22, and then improve a compatibility between the first organic packaging section21and the second organic packaging section22, so as to avoid affecting the packaging effect due to a difference of the packaging materials. On the other hand, when the first organic packaging section21and the second organic packaging section22are prepared by a ink-jet printing process, since it is necessary to first place the packaging materials and the water absorbent211in the first organic packaging section21in organic solvents to form ink, then form a film through the ink-jet printing process, and place the packaging materials in the second organic packaging section22in organic solvents to form ink, then form a film through the ink-jet printing process. When the packaging materials used in the first organic packaging section21and the packaging materials used in the second organic packaging section22are the same, leveling of the ink can be enhanced, so that a generation probability of mura during the film formation can be reduced.

Referring toFIG.1, in the present embodiment, an end21A of the first organic packaging section21is flush with an end22A of the second organic packaging section22. Wherein, the end21A of the first organic packaging section21refers to an end of the first organic packaging section21away from the main display part10, and the end22A of the second organic packaging section22refers to an end of the second organic packaging section22away from the main display part10. Above arrangement makes a film thickness at a junction of the first organic packaging section21and the second organic packaging section22consistent, so that the generation probability of the mura between the first organic packaging section21and the second organic packaging section22can be further reduced.

The OLED display panel100also comprises a first retaining wall30. The first retaining wall30is disposed on the driving substrate11. The first retaining wall30is disposed around the display area10A. The first retaining wall30is located on one side of the first organic packaging section21away from the display area10A. By arranging the first retaining wall30on outside of the first organic packaging section21, it can block the first organic packaging section21in an area close to the display area10A, thus to avoid an overflow of the first organic packaging section21to an outside of the first retaining wall30during a preparation process, which is conducive to improving the edge packaging effect.

In the present embodiment, numbers of the first retaining wall30is one, and the first retaining wall30is an annular structure. In addition, in some embodiments, the numbers of the first retaining wall30can be a plurality, and the plurality of the first retaining wall30are arranged in sequence around the first organic packaging section21. The structure of the first retaining wall30is not specifically limited in the present application.

Further, the OLED display panel100also comprises a second retaining wall40. The second retaining wall40is disposed on the driving substrate11. A height of the second retaining wall40is less than a height of the first retaining wall30. The second retaining wall40is located between the first organic packaging section21and the first retaining wall30.

In the present embodiment, the OLED display panel100also comprises a first inorganic packaging layer50and a second inorganic packaging layer60.

Wherein, the first inorganic packaging layer50is arranged between the first electrode13and the first organic packaging layer20. The first inorganic packaging layer50extends from the display area10A to the non-display area10B. The first inorganic packaging layer50covers the first electrode13, the first retaining wall30, and the second retaining wall40. Materials of the first inorganic packaging layer50can comprise one or more of silicon oxide, silicon nitride, and silicon oxynitride. The second inorganic packaging layer60is arranged on one side of the first organic packaging layer20away from the first inorganic packaging layer50. The second inorganic packaging layer60extends from the display area10A to the non-display area10B. The second inorganic packaging layer60covers the first organic packaging layer20, the first retaining wall30, and the second retaining wall40. Materials of the second inorganic packaging layer60can comprise one or more of silicon oxide, silicon nitride, and silicon oxynitride.

At edges of the non-display area10B, if water resistance of the first inorganic packaging layer50and the second inorganic packaging layer60decreases or the first inorganic packaging layer50and the second inorganic packaging layer60crack, when the external water vapor invades, since the first organic packaging section21sandwiches between the first inorganic packaging layer50and the second inorganic packaging layer60, the external water vapor will first enter the first organic packaging section21along edges of the first inorganic packaging layer50and the second inorganic packaging layer60, and be absorbed by the water absorbent211in the first organic packaging section21, so as to delay the time for the external water vapor to enter the display area10A from the first organic packaging section21, and improve the packaging effect of the edges of the OLED display panel100.

Referring toFIG.2AtoFIG.2E,FIG.3, andFIG.4, a preparation method of the OLED display panel100provided in the first embodiment of the present application comprises following steps:B1: providing the main display part10, and forming the first retaining wall30, the second retaining wall40, and the first inorganic packaging layer50on the main display part10, as shown inFIG.2A.

Wherein, the main display part10has the display area10A and the non-display area10B disposed around the display area10A. The main display part10comprises the driving substrate11, the light-emitting layer12, and the first electrode13formed in sequence.

Specifically, the first inorganic packaging layer50is formed by a PECVD process with materials of one or more of silicon oxide, silicon nitride, and silicon oxynitride.B2: forming the second organic packaging section22to be cured on the first electrode13, as shown inFIG.2BandFIG.3.

Specifically, using the epoxy resin as the packaging materials to prepare a first ink22A without the water absorbent211, and spraying the first ink22A evenly on a surface of the first electrode13by the ink-jet printing process. Wherein, a boundary of the first ink22A is located on one side of the first electrode13away from the display area10A. In the present embodiment, it is necessary to ensure that a certain space is reserved between the first ink22A and the second retaining wall40to accommodate the first organic packaging section21in next step.B3: forming the first organic packaging section21to be cured on the first inorganic packaging layer50, as shown inFIG.2CandFIG.4.

Specifically, using the epoxy resin as the packaging materials to prepare a second ink21A containing the water absorbent211, and spraying the second ink21A evenly between the second organic packaging section22to be cured and the second retaining wall40by the ink-jet printing process. Wherein, a boundary of the second ink21A is located on one side of the second retaining wall40close to the display area10A.

It should be noted that in some embodiments, the epoxy resin mixed with the water absorbent211can also be directly coated on a surface of the second organic packaging section22to be cured by a coating process, which will not be described here.B4: curing the first organic packaging section21and the second organic packaging section22to form the first organic packaging layer20, as shown inFIG.2DandFIG.5.

After the first ink22A and the second ink21A is leveled, curing the first organic packaging section21to be cured and the second organic packaging section22to be cured under ultraviolet light, thereby forming the first organic packaging layer20.B5: forming the second inorganic packaging layer60on the first organic packaging layer20, as shown inFIG.2E.

Specifically, the second inorganic packaging layer60is formed by the PECVD process with materials of one or more of silicon oxide, silicon nitride, and silicon oxynitride.

Thus, the preparation method of the OLED display panel100provided by the present embodiment is completed.

Referring toFIG.6, a second embodiment of the present application provides the OLED display panel200. The OLED display panel200provided in the second embodiment of the present application is different from the first embodiment in that the first organic packaging section21covers the second retaining wall40and extends to an area where the driving substrate11is located between the first retaining wall30and the second retaining wall40.

Specifically, the first organic packaging section21covers an area where the first inorganic packaging layer50is not covered by the second organic packaging section22, and one end of the first organic packaging section21away from the display area10A is located between the first retaining wall30and the second retaining wall40.

Compared with the OLED display panel100provided in the first embodiment, the OLED display panel200provided in the present embodiment reduces a distance from the first organic packaging section21to an edge of the main display part10, and can further delay the time of the water vapor intrusion to the display area10A in case of the external water vapor intrusion, so as to further reduce the failure probability of the light-emitting devices.

Referring toFIG.7, a third embodiment of the present application provides the OLED display panel300. The OLED display panel300provided in the third embodiment of the application is different from the second embodiment in that the OLED display panel300also comprises a second organic packaging layer70and a third inorganic packaging layer80, wherein the second organic packaging layer70is located between the first inorganic packaging layer50and the second inorganic packaging layer60, and a boundary of the second organic packaging layer70is located on one side of the second retaining wall40close to the display area10A, the first organic packaging layer20is located on one side of the second inorganic packaging layer60away from the first inorganic packaging layer50, the first organic packaging section21is located between the second organic packaging layer70and the first retaining wall30, the third inorganic packaging layer80is located on one side of the first organic packaging layer20away from the second inorganic packaging layer60, and the third inorganic packaging layer80covers the first organic packaging layer20and the first retaining wall30. The first organic packaging section21includes a vertical portion21A and a horizontal portion21B connected to the vertical portion21A; the vertical portion21A is disposed at a side of the second retaining wall40away from the first retaining wall30, and a side surface of the vertical portion21A close to the display area10A is in contact with a side surface of the second organic packaging section22and a side surface of the second inorganic packaging layer50; and the horizontal portion21B and the second inorganic packaging layer50both cover an upper surface of the second retaining wall40, and the horizontal portion21B is in contact with an upper surface of a part of the second inorganic packaging layer50located above the second retaining wall40.

In the present embodiment, the first inorganic packaging layer50, the second organic packaging layer70, the second inorganic packaging layer60, the first organic packaging layer20and the third inorganic packaging layer80constitute a packaging structure. Compared with a laminated structure of an inorganic packaging layer, an organic packaging layer, and an inorganic packaging layer, the present embodiment can further improve an overall packaging effect of the OLED display panel by adding an organic packaging layer and an inorganic packaging layer.

In addition, in the present embodiment, by setting two organic packaging layers, and only arranging the water absorbent211in the first organic packaging section21in the first organic packaging layer20, while the second organic packaging layer70does not contain the water absorbent211, and then at the edges of the non-display area10B, if the water resistance of inorganic packaging layers such as the first inorganic packaging layer50, the second inorganic packaging layer60or the third inorganic packaging layer80decreases or the inorganic packaging layers crack, when the external water vapor invades from the edges of the main display part10, the invaded external water vapor will first enter the first organic packaging section21and be absorbed by the water absorbent211in the first organic packaging section21, thereby delaying the time for the external water vapor to enter the display area10A from the first organic packaging section21, which can improve the packaging effect of the edges of the OLED display panel300.

Referring toFIG.8, a fourth embodiment of the present application provides the OLED display panel400. The OLED display panel400provided in the fourth embodiment of the present application is different from the third embodiment in that the second organic packaging layer70comprises a third organic packaging section71and a fourth organic packaging section72, wherein the fourth organic packaging section72is located in the display area10A and extends to part areas of the non-display area10B, and the third organic packaging section71is disposed around the fourth organic packaging section72and located in the non-display area10B, wherein the third organic packaging section71comprises water absorbent711. The first organic packaging section21includes a vertical portion21A and a horizontal portion21B connected to the vertical portion21A; the vertical portion21A is disposed at a side of the second retaining wall40away from the first retaining wall30, and a side surface of the vertical portion21A close to the display area10A is in contact with a side surface of the second organic packaging section22and a side surface of the second inorganic packaging layer50; and the horizontal portion21B and the second inorganic packaging layer50both cover an upper surface of the second retaining wall40, and the horizontal portion21B is in contact with an upper surface of a part of the second inorganic packaging layer50located above the second retaining wall40.

At the edges of the non-display area10B, if the water resistance of the inorganic packaging layers such as the first inorganic packaging layer50, the second inorganic packaging layer60or the third inorganic packaging layer80decreases or the inorganic packaging layers crack, when the external water vapor invades from the edges of the main display part10, the invaded external water vapor will first enter the first organic packaging section21and be absorbed by the water absorbent211in the first organic packaging section21, and then, if the external water vapor continues to invade the second organic packaging layer70along a direction close to the display area10A, the external water vapor will first enter the third organic packaging section71and be absorbed by the water absorbent711in the third organic packaging section71. Therefore, the present embodiment can greatly delay the time for the external water vapor to invade the display area10A through a dual water absorption of the first organic packaging section21and the third organic packaging section71, so as to significantly improve the packaging effect of the edges of the OLED display panel400.

The present application also provides an electronic device, which can be any products or components with a display function, such as electronic papers, mobile phones, tablet computers, TVs, displays, notebook computers, digital photo frames, navigators, etc. Wherein, the electronic device comprises a shell and the OLED display panel arranged in the shell. The OLED display panel can be the OLED display panel described in any of the foregoing embodiments. Specific structure of the OLED display panel can refer to descriptions of the foregoing embodiments and will not be repeated here.

The above describes the OLED display panel and the electronic device provided by the embodiments of the present application in detail. In this paper, specific examples are applied to explain a principle and implementation modes of the present application. The descriptions of the above embodiments are only used to help understand a method and a core idea of the present application; meanwhile, for those skilled in the art, there will be changes in the specific implementation modes and an application scope according to the idea of the present application. In conclusion, contents of the specification should not be understood as restrictions on the present application.