OLED display panel

Abstract

The invention provides an OLED (Organic Light Emitting Diode) display panel. The display panel comprises an OLED display substrate, a filling layer and a packaging cover plate, the packaging cover plate and the OLED display substrate are oppositely arranged, and the filling layer is arranged in a gap between the packaging cover plate and the OLED display substrate; the filling layer comprises an inorganic layer and an optical adhesive layer. According to the OLED display panel, the inorganic layer is arranged between the OLED light-emitting device layer and the optical adhesive layer used for filling the gap, so that the organic optical adhesive layer is prevented from dissolving the topmost layer of the OLED light-emitting device layer or the organic packaging layer on the topmost layer, the gap is filled with the optical adhesive layer, equal inclination interference caused by non-uniform gap thickness is avoided, and meanwhile, the OLED display panel can be used for manufacturing the OLED display panel. The OLED light-emitting device layer is not damaged, so that the light-emitting efficiency of the display panel is reduced, and improvement of large-viewing-angle rainbow lines and improvement of the light-emitting efficiency of the display panel are both achieved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more particularly, to an OLED display panel. Background Art

[0002] Organic Light Emission Diode (OLED) display panels have characteristics such as high brightness, a wide range of material selection, low driving voltage, and full-curing active light emission. At the same time, they have advantages such as high definition, wide viewing angle, and fast response speed, making them a highly potential display technology.

[0003] In current rigid OLED display panels, due to the problem of the air gap (Gap) between the upper cover plate and the OLED display substrate, and due to the non-uniformity of the gap thickness, as well as the certain reflectivity of the cathode and the upper cover plate, equal inclination interference will occur. In the case of a large viewing angle, due to the problem of thin film interference, large viewing angle rainbow patterns will be generated. To improve this problem, the usual technical solution is to fill the gap with optical glue. However, in actual use, it is found that there is a problem that the filled optical glue dissolves the organic material at the topmost layer of the OLED display substrate in contact with it.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to those skilled in the art. Summary of the Invention

[0005] Aiming at the problems in the prior art, the purpose of the present invention is to provide an OLED display panel, in which an inorganic layer is added between the topmost layer of the light-emitting device layer and the existing optical glue layer in the gap to prevent the organic optical glue layer in the gap from dissolving the top layer of the OLED display substrate, so as to improve the large viewing angle rainbow pattern while improving the light emission efficiency of the display panel.

[0006] The present invention provides an OLED display panel, including an OLED display substrate, a filling layer, and a packaging cover plate;

[0007] The packaging cover plate and the OLED display substrate are disposed opposite to each other, and the filling layer is disposed in the gap between the packaging cover plate and the OLED display substrate;

[0008] The filling layer includes an inorganic layer and an optical glue layer.

[0009] According to some examples of the present invention, the material of the inorganic layer is selected from at least one of LiF, CsF, Cs2CO3, silicon oxide, silicon oxynitride, and silicon nitride.

[0010] According to some examples of the present invention, the inorganic layer is obtained by an evaporation process or a chemical vapor deposition process.

[0011] According to some examples of the present invention, the thickness of the inorganic layer is between.

[0012] According to some examples of the present invention, the optical refractive index of the inorganic layer is between 1.3 and 2.0.

[0013] According to some examples of the present invention, the OLED display substrate includes a substrate, a pixel circuit array layer, an OLED light-emitting device layer, and an organic encapsulation layer.

[0014] According to some examples of the present invention, the material of the organic encapsulation layer is one of the acrylic series, the epoxy resin series, or the silicone series.

[0015] According to some examples of the present invention, the OLED light-emitting device layer includes a first electrode, a first charge-conducting layer, a light-emitting layer, a second charge-conducting layer, and a second electrode;

[0016] The light-emitting layer includes a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer formed by arranging a red pixel region, a green pixel region, and a blue pixel region side by side.

[0017] According to some examples of the present invention, the inorganic layer includes a plurality of first regions and a second region outside the first regions;

[0018] The material of the first region has a different refractive index from that of the second region;

[0019] The projection of the first region on the substrate coincides with the projection of the red pixel region, the green pixel region, or the blue pixel region on the substrate.

[0020] According to some examples of the present invention, the first region is a lithium fluoride layer, and the second region is a silicon oxynitride layer.

[0021] In the OLED display panel of the present invention, an inorganic layer is provided between the OLED light-emitting device layer and the optical adhesive layer serving as a filling gap, thereby preventing the organic optical adhesive layer from dissolving the top layer of the OLED light-emitting device layer or the organic encapsulation layer thereon. While the optical adhesive layer fills the gap to avoid equal inclination interference caused by uneven gap thickness, it will not damage the OLED light-emitting device layer, thereby reducing the light-emitting efficiency of the display panel. It takes into account improving the large-angle rainbow pattern and increasing the light-emitting efficiency of the display panel. Description of the Drawings

[0022] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0023] Figure 1 is a structural cross-sectional view of an OLED display panel according to an embodiment of the present invention;

[0024] Figure 2 is a structural cross-sectional view of an OLED display panel according to another embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of an OLED display substrate according to an embodiment of the present invention; and

[0026] Figure 4 is a cross-sectional view of an OLED display substrate according to another embodiment of the present invention. Detailed Embodiments

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. The features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments.

[0028] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of this specification. Moreover, the specific features, structures, materials, or characteristics represented can be combined in any suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples represented in this specification and the features of different embodiments or examples.

[0029] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" with other elements placed therebetween. Relative spatial terms such as "lower", "upper", etc. may be used to more easily explain the relationship of one device relative to another device illustrated in the drawings. Such terms refer to not only the meaning indicated in the drawings, but also other meanings or operations of the device in use. For example, if the device in the drawing is flipped, a device that was described as "lower" than other devices is then described as "upper" than other devices. Therefore, the exemplary term "lower" includes both upper and lower. The device may be rotated by 90° or other angles, and the relative spatial terms are also interpreted accordingly.

[0030] Although in some instances the terms first, second, etc. are used herein to denote various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are indicated. Furthermore, as used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the stated features, steps, operations, elements, components, items, kinds, and / or groups, but do not preclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or meaning any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition occurs only when the combination of elements, functions, steps, or operations are mutually exclusive in some manner.

[0031] Although not fully defined, including technical terms and scientific terms used herein, all terms have the same meaning as generally understood by those skilled in the technical field to which this specification pertains. Terms defined in commonly used dictionaries are additionally interpreted as having a meaning consistent with the relevant technical literature and the content currently presented. As long as they are not defined, they should not be over-interpreted as ideal or overly formulaic meanings.

[0032] In view of the existing technical problems, the present invention provides an OLED display panel, which includes an OLED display substrate, a filling layer, and a packaging cover plate; the packaging cover plate and the OLED display substrate are disposed opposite to each other, and the filling layer is disposed in the gap between the packaging cover plate and the OLED display substrate; the filling layer includes an inorganic layer and an optical adhesive layer. In the OLED display panel of the present invention, an inorganic layer is provided between the OLED light-emitting device layer and the optical adhesive layer serving as the filling gap, thereby preventing the organic optical adhesive layer from dissolving the top layer of the OLED light-emitting device layer or the organic packaging layer thereon. While the optical adhesive layer fills the gap to avoid equal inclination interference caused by uneven gap thickness, it will not damage the OLED light-emitting device layer, thus reducing the light-emitting efficiency of the display panel. It takes into account the improvement of large-angle rainbow patterns and the increase in the light-emitting efficiency of the display panel.

[0033] The following further elaborates on the structure of the OLED display panel of the present invention in conjunction with the accompanying drawings and specific embodiments. It can be understood that each specific embodiment does not limit the protection scope of the present invention.

[0034] Figure 1 and Figure 2 are respectively the structural sectional views of the OLED display panel of different embodiments of the present invention. Specifically, the OLED display panel includes an OLED display substrate, a filling layer 5, and a packaging cover plate 6; the packaging cover plate 6 and the OLED display substrate are disposed opposite to each other, and the filling layer 5 is disposed in the gap between the packaging cover plate 6 and the OLED display substrate.

[0035] Figure 1 In the embodiment of, the OLED display substrate includes a substrate 1, a pixel circuit array layer 2, and an OLED light-emitting device layer 3.

[0036] In some other embodiments, such as Figure 2Embodiment, the OLED display substrate includes a substrate 1, a pixel circuit array layer 2, an OLED light-emitting device layer 3, and an organic encapsulation layer 4. The material of the organic encapsulation layer 4 is one of acrylic series, epoxy resin series, or silicone series. More specifically, the organic encapsulation layer 4 includes at least one organic substance among acrylic, polysiloxane, fluorinated-polysiloxane, polyurethane, fluorinated-polyurethane, polyurethane-acrylate, fluorinated-polyurethane-acrylate, cardobinder, polyimide, polymethylsilsesquioxane (PMSSQ), poly(methylmethacrylate) (PMMA), and a PMSSQ-PMMA mixture.

[0037] The OLED light-emitting device layer 3 may include a first electrode 31, a first carrier conductive layer, a light-emitting layer 34, a second carrier conductive layer, and a second electrode 37. Figure 3 It is a cross-sectional view of the OLED display substrate according to an embodiment of the present invention, where the first electrode 31 is an anode and the second electrode 37 is a cathode. Correspondingly, the first carrier conductive layer is a hole conductive layer and may include a hole injection layer 32 and a hole transport layer 33. The second carrier conductive layer is an electron conductive layer and may include an electron injection layer 35 and an electron transport layer 36.

[0038] In other embodiments, the structures of the first electrode and the second electrode can be reversed, that is, the driving transistor is connected to the cathode of the OLED light-emitting film layer. At this time, the first electrode is a cathode and the second electrode is an anode. Correspondingly, the first carrier conductive layer is an electron conductive layer and may include an electron injection layer and an electron transport layer. The second carrier conductive layer is a hole conductive layer and may include a hole injection layer and a hole transport layer.

[0039] The filling layer 5 of the OLED display panel of the present invention includes an inorganic layer 51 and an optical adhesive layer 52. The material of the inorganic layer can be selected from at least one of lithium fluoride (LiF), cesium fluoride (CsF), cesium carbonate (Cs2CO3), silicon oxide, silicon oxynitride, and silicon nitride. The inorganic layer 51 can be formed by evaporation or chemical vapor deposition. For example, the LiF layer, CsF layer, or Cs2CO3 layer can be obtained by evaporation, while the SiO layer, SiN layer, or SiNO layer can be obtained by plasma enhanced chemical vapor deposition (PECVD). The thickness of the inorganic layer 51 is in a certain range. The inorganic layer 51 with this thickness can effectively reduce the reaction between the optical adhesive layer 52 and the uppermost layer of the OLED light-emitting device layer 3 or between the optical adhesive layer 52 and the organic encapsulation layer 4. At the same time, the filling layer 5 uses the optical adhesive layer 52 to reduce the reflection between interfaces, increase the light extraction, and reduce the light refraction, improve the large-angle rainbow pattern, and enhance the light extraction.

[0040] In some embodiments, the optical refractive index of the inorganic layer 51 is between 1.3 and 2.0. In addition to reducing the corrosion of the OLED light-emitting device layer, it can also increase the refractive index of the OLED light emission, and improve the power efficiency and lifespan by suppressing light absorption.

[0041] Further, the light-emitting layer 34 includes a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer formed by arranging a red pixel region R, a green pixel region G, and a blue pixel region B side by side. The inorganic layer 51 includes a plurality of first regions A and a second region C other than the first regions A

[0042] The material of the first region A has a different refractive index from that of the second region C. The projection of the first region A on the substrate 1 coincides with the projection of the red pixel region R, the green pixel region G, or the blue pixel region B on the substrate 1. That is, each first region corresponds to a pixel region. More specifically, the refractive index of the material of the first region A is smaller than that of the second region C. For example, the first region A can be a lithium fluoride layer, and the second region C is a silicon oxynitride layer, as shown in Figure 4 .

[0043] Preferably, the first region A corresponding to the red pixel region R, the green pixel region G, or the blue pixel region B preferably uses a material with a high transmittance (i.e., a low refractive index), which is beneficial to improving the light extraction of the OLED display panel. For the second region C, an inorganic material with a light-concentrating effect can be selected, which can also gather the light scattered to the side in the light emitted by the light-emitting layer, further improving the light output rate of the OLED display panel.

[0044] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those skilled in the art, it is obvious that this application is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of this application, this application can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of this application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in this application. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. An OLED display panel, characterized in that, It includes an OLED display substrate, a filling layer, and a packaging cover plate; The packaging cover plate and the OLED display substrate are disposed opposite to each other, and the filling layer is disposed in the gap between the packaging cover plate and the OLED display substrate; The filling layer includes an inorganic layer and an optical adhesive layer.

2. The OLED display panel according to claim 1, wherein The material of the inorganic layer is selected from at least one of LiF, CsF, Cs2CO3, silicon oxide, silicon oxynitride, and silicon nitride.

3. The OLED display panel according to claim 1, wherein, The inorganic layer is obtained by an evaporation process or a chemical vapor deposition process.

4. The OLED display panel according to claim 1, wherein The thickness of the inorganic layer is between and 5. The OLED display panel according to claim 1, wherein The optical refractive index of the inorganic layer is between 1.3 and 2.

0.

6. The OLED display panel according to claim 1, characterized in that, The OLED display substrate includes a substrate, a pixel circuit array layer, an OLED light-emitting device layer, and an organic packaging layer.

7. The OLED display panel according to claim 6, wherein The material of the organic packaging layer is one of the acrylic series, epoxy resin series, or silicone series.

8. The OLED display panel according to claim 6, wherein The OLED light-emitting device layer includes a first electrode, a first carrier conductive layer, a light-emitting layer, a second carrier conductive layer, and a second electrode; The light-emitting layer includes a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer formed by arranging a red pixel region, a green pixel region, and a blue pixel region side by side.

9. The OLED display panel according to claim 8, wherein, The inorganic layer includes a plurality of first regions and a second region other than the first regions; The material of the first region has a different refractive index from that of the second region; The projection of the first region on the substrate coincides with the projection of the red pixel region, the green pixel region, or the blue pixel region on the substrate.

10. The OLED display panel according to claim 9, wherein, The first region is a lithium fluoride layer, and the second region is a silicon oxynitride layer.

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