Display panel and display device

Abstract

The utility model provides a display panel and a display device.The display panel comprises a substrate, an organic light-emitting layer, a black pixel definition layer, a packaging layer, a covering layer and a refraction layer.The black pixel definition layer is arranged on the first face of the substrate and provided with a plurality of pixel openings; the organic light-emitting layer comprises a plurality of light-emitting units, and the light-emitting units are at least partially embedded in the pixel openings; the packaging layer is arranged on the black pixel definition layer and the second surface, far away from the substrate, of the organic light-emitting layer; the refraction layer is embedded in the packaging layer and is used for refracting at least part of external light entering the light-emitting unit to the black pixel definition layer; the covering layer is arranged on the third surface, away from the substrate, of the packaging layer. According to the technical scheme, the refraction layer structure is embedded in the packaging layer, and the incident angle of external light is increased, so that the external light entering the light-emitting unit is refracted to the black pixel definition layer and is absorbed, the reflectivity of the surface of the display device is reduced, and the contrast ratio of the display panel is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field related to display panels, and in particular, to a display panel and a display device. Background Art

[0002] With the development of science and technology, the application of mobile electronic devices such as smart phones and computers is becoming more and more widespread. As one of the main components of these electronic devices, users have higher and higher requirements for the display effects presented by the display panel. It is understandable that for traditional organic light-emitting display devices (OLED), since the electrode part itself has a strong reflective effect, and the wiring area between each device is equipped with metal wires that easily reflect light, the reflectivity of the OLED display panel is large, which affects the display effect.

[0003] Specifically, the main light-emitting structure of the OLED display panel includes an anode material, an OLED light-emitting material and a cathode material, wherein the anode material and the cathode material are used to provide the OLED light-emitting material with the driving voltage required for light emission, and the light emitted by the OLED light-emitting material passes through the cathode layer, the thin film encapsulation layer and the cover glass layer to achieve the display effect. As a top-emitting device, the cathode material disposed on the upper layer of the OLED light-emitting material needs to be set as a transparent material; at the same time, in order to ensure the uniformity of the OLED light emission, the resistance of the cathode material needs to be as small as possible. Currently, commonly used cathode materials include metallic silver and magnesium-silver alloys, which exhibit high-transmittance transparent materials when the thickness is in the nanometer order. However, as metal materials, metallic silver or magnesium-silver alloys still have some metallic properties, that is, a higher reflectivity. Therefore, the OLED display panel with the above structure will exhibit certain reflective characteristics in a strong ambient light atmosphere, which affects the overall display effect. Utility Model Content

[0004] In view of the problems in the prior art, the present invention aims to provide a display panel and a display device, which refract a portion of the incident light to a black pixel definition layer by setting a refraction layer to reduce the reflectivity of the device surface, thereby improving the contrast of the display panel.

[0005] Specifically, a first aspect of the present disclosure provides a display panel, which may include:

[0006] A substrate, an organic light emitting layer, a black pixel definition layer, an encapsulation layer, a cover layer and a refractive layer, wherein:

[0007] The black pixel definition layer is disposed on the first surface of the substrate and has a plurality of pixel openings;

[0008] The organic light-emitting layer includes a plurality of light-emitting units, and the light-emitting units are at least partially embedded in the pixel openings;

[0009] The encapsulation layer is disposed on the second surface of the black pixel definition layer and the organic light emitting layer away from the substrate;

[0010] The refraction layer is embedded in the encapsulation layer and is used to refract at least a portion of the external light incident on the light-emitting unit to the black pixel definition layer;

[0011] The covering layer is arranged on the third surface of the packaging layer away from the substrate.

[0012] In a possible implementation of the first aspect, the encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer stacked in sequence;

[0013] The refractive layer is located between the organic layer and the second inorganic layer.

[0014] In a possible implementation of the first aspect, the refractive layer includes a transparent layer and a gradient refractive index structure, wherein:

[0015] The transparent layer includes a plurality of refraction openings, and the arrangement positions of the refraction openings correspond one to one with the arrangement positions of the pixel openings;

[0016] The gradient refractive index structure is embedded in the refractive opening.

[0017] In a possible implementation of the first aspect above, the thickness of the transparent layer is the same as the thickness of the gradient refractive index structure.

[0018] In a possible implementation of the first aspect above, an orthographic projection of the gradient refractive index structure on the substrate covers an orthographic projection of a corresponding light-emitting unit on the substrate.

[0019] In a possible implementation of the first aspect, the gradient refractive index structure diffuses external light along a central axis direction of the gradient refractive index structure, so as to refract at least part of the external light to the black pixel definition layer.

[0020] In a possible implementation of the first aspect above, the gradient refractive index structure includes a concave lens structure.

[0021] In a possible implementation of the first aspect, the organic light-emitting layer includes a substrate layer, an anode layer, a first functional layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, a second functional layer, a cathode layer, and a light extraction layer stacked in sequence;

[0022] The first functional layer includes a hole injection layer and a hole transport layer stacked in sequence;

[0023] The second functional layer includes an electron transport layer and an electron injection layer stacked in sequence.

[0024] In a possible implementation of the first aspect above, the cathode layer is made of metallic silver or a magnesium-silver alloy.

[0025] A second aspect of the present disclosure provides a display device, which includes any one of the display panels provided in the first aspect.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] Through the technical solution provided by the present invention, a refractive layer structure is embedded in the packaging structure above the top emission of the pixel unit. By increasing the incident angle of the external light, at least part of the external light incident on the light-emitting unit is refracted to the black pixel definition layer and absorbed by the black pixel definition layer, thereby reducing the reflectivity of the surface of the display device and improving the contrast of the display panel. This overcomes the application problem of strong reflected light of the display panel in the prior art and has popularizable value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present disclosure will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0029] Figure 1 According to an embodiment of the present disclosure, a schematic cross-sectional structure diagram of a display panel is provided.

[0030] Figure 2 According to an embodiment of the present disclosure, a schematic cross-sectional structure diagram of an organic light-emitting layer is provided. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0032] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0033] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials, or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials, or characteristics represented may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0036] 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" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0037] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0038] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0039] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0040] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the content of relevant technical literature and current disclosures, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0041] It is understandable that, based on the relevant description in the prior art, the existing OLED display panel has a high reflectivity due to the metal properties of the manufacturing material, which leads to poor overall display effect. In order to solve the above technical problems, the present disclosure provides a display panel and a display device, which refracts a part of the incident light to the black pixel definition layer by setting a refraction layer to reduce the reflectivity of the device surface. The technical solution involved in the present disclosure will be specifically explained and illustrated as follows:

[0042] In some embodiments of the present disclosure, Figure 1 A schematic diagram of a cross-sectional structure of a display panel is provided, specifically, Figure 2As shown, the substrate 100, the organic light emitting layer 200, the black pixel definition layer 300, the encapsulation layer 400, the cover layer 500 and the refraction layer 600 may be included, wherein:

[0043] The black pixel definition layer 300 is arranged on the first surface of the substrate 100 and has a plurality of pixel openings; the organic light-emitting layer 300 includes a plurality of light-emitting units, which are at least partially embedded in the pixel openings. The positioning and setting of each pixel unit in the display panel are achieved through the interval setting of the black pixel definition layer 300 and the organic light-emitting layer 200.

[0044] like Figure 2 As shown, the encapsulation layer 400 is disposed on the second surface of the black pixel definition layer 300 and the organic light emitting layer 200 away from the substrate 100; the covering layer 500 is disposed on the third surface of the encapsulation layer 400 away from the substrate 100; and the refraction layer 600 is embedded in the encapsulation layer 400, and is used to refract at least part of the external light incident on the light emitting unit to the black pixel definition layer 300. It can be understood that refracting at least part of the external light incident on the light emitting unit to the black pixel definition layer 300 can reduce the external light entering the incident light emitting unit, thereby reducing the reflectivity of the surface of the display panel device, and can effectively improve the contrast of the display panel.

[0045] In the above embodiment, if Figure 2 As shown, specifically, the encapsulation layer 400 includes a first inorganic layer 401, an organic layer 402, and a second inorganic layer 403 stacked in sequence, wherein the refractive layer 600 is located between the organic layer 402 and the second inorganic layer 403. It can be understood that the refractive layer 600 is embedded between the organic layer 402 and the second inorganic layer 403 of the encapsulation layer 400, so as to facilitate the stable arrangement of the refractive layer 600.

[0046] In the above embodiment, if Figure 2 As shown, further, the refractive layer 600 includes a transparent layer 601 and a gradient refractive index structure 602, wherein the transparent layer 601 includes a plurality of refractive openings, the setting positions of the refractive openings correspond to the setting positions of the pixel openings, and the gradient refractive index structure 602 is embedded in the refractive openings. The gradient refractive index structure 602 is an optical element for changing the trajectory of light, and its refractive effect is achieved through a specific continuous change of the internal refractive index. In a specific implementation of the above embodiment, the gradient refractive index structure 602 can be an optical device structure such as a concave lens, which is not limited here.

[0047] Through the above arrangement, the gradient refractive index structure 602 can be aligned with the pixel opening position, so as to refract and deflect the external light incident on the light-emitting unit to the black pixel definition layer 300. Figure 2As shown in the figure, it can be seen that the gradient refractive index structure 602 can diffuse the external light along its central axis direction, so as to refract at least part of the external light to the black pixel definition layer 300, that is, Figure 2 The external light perpendicularly incident on the light emitting unit is refracted by the gradient refractive index structure 602 and then projected to the black pixel definition layer 300 and absorbed by it. Since the refractive layer 600 is entirely embedded in the encapsulation layer 400, the thickness of the transparent layer 601 and the thickness of the gradient refractive index structure 602 in the film thickness direction can remain the same. In a specific implementation of the above embodiment, the orthographic projection of the gradient refractive index structure 602 on the substrate 100 covers the orthographic projection of the corresponding light emitting unit on the substrate 100.

[0048] In some embodiments of the present disclosure, Figure 2 A schematic cross-sectional structure diagram of an organic light-emitting layer 200 is provided. Figure 2 As shown, it may specifically include a substrate layer 201, an anode layer 202, a first functional layer 203, an electron blocking layer 204, a light-emitting layer 205, a hole blocking layer 206, a second functional layer 207, a cathode layer 208, and a light extraction layer 209 stacked in sequence, wherein the first functional layer 203 includes a hole injection layer 203a and a hole transport layer 203b stacked in sequence; the second functional layer 207 includes an electron transport layer 207a and an electron injection layer 207b stacked in sequence. In the above embodiment, the cathode layer 208 may be made of metallic silver or a magnesium-silver alloy, which exhibits a high transmittance transparent material when the thickness is in the nanometer order.

[0049] In some embodiments of the present disclosure, a display device is also provided. The display device includes the display panel provided by the aforementioned embodiment, which can refract a portion of the incident light of the incident light-emitting unit to the black pixel definition layer to reduce the reflectivity of the device surface, which will not be elaborated here.

[0050] To sum up, through the technical solution provided by the present invention, a refractive layer structure is embedded in the packaging structure above the top emission of the pixel unit, and by increasing the incident angle of the external light, at least part of the external light incident on the light-emitting unit is refracted to the black pixel definition layer and absorbed by the black pixel definition layer, thereby reducing the reflectivity of the surface of the display device and improving the contrast of the display panel. This overcomes the application problem of strong reflected light of the display panel in the prior art and has popularizable value.

[0051] The above content is a further detailed description of the present disclosure in combination with specific preferred implementation modes, and it cannot be determined that the specific implementation of the present disclosure is limited to these descriptions. For ordinary technicians in the technical field to which the present disclosure belongs, several simple deductions or substitutions can be made without departing from the concept of the present disclosure, which should be regarded as falling within the scope of protection of the present disclosure.

Claims

1. A display panel, characterized in that: The display panel includes a substrate, an organic light emitting layer, a black pixel definition layer, an encapsulation layer, a cover layer and a refraction layer, wherein: The black pixel definition layer is disposed on the first surface of the substrate and has a plurality of pixel openings; The organic light-emitting layer includes a plurality of light-emitting units, and the light-emitting units are at least partially embedded in the pixel openings; The encapsulation layer is disposed on the second surface of the black pixel definition layer and the organic light emitting layer away from the substrate; The refraction layer is embedded in the encapsulation layer and is used to refract at least a portion of the external light incident on the light-emitting unit to the black pixel definition layer; The covering layer is arranged on a third surface of the packaging layer away from the substrate.

2. The display panel according to claim 1, wherein: The encapsulation layer includes a first inorganic layer, an organic layer and a second inorganic layer stacked in sequence; The refractive layer is located between the organic layer and the second inorganic layer.

3. The display panel according to claim 1, wherein: The refractive layer includes a transparent layer and a gradient refractive index structure, wherein: The transparent layer includes a plurality of refraction openings, and the arrangement positions of the refraction openings correspond one-to-one to the arrangement positions of the pixel openings; The gradient refractive index structure is embedded in the refractive opening.

4. The display panel according to claim 3, wherein: The thickness of the transparent layer is the same as the thickness of the gradient refractive index structure.

5. The display panel according to claim 3, wherein: The orthographic projection of the gradient refractive index structure on the substrate covers the orthographic projection of the corresponding light emitting unit on the substrate.

6. The display panel according to claim 3, wherein: The gradient refractive index structure diffuses the external light along a central axis direction of the gradient refractive index structure, so as to refract at least a portion of the external light to the black pixel definition layer.

7. The display panel according to claim 3, wherein: The gradient refractive index structure includes a concave lens structure.

8. The display panel according to claim 1, wherein: The organic light-emitting layer comprises a substrate layer, an anode layer, a first functional layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, a second functional layer, a cathode layer and a light extraction layer which are stacked in sequence; The first functional layer includes a hole injection layer and a hole transport layer stacked in sequence; The second functional layer includes an electron transport layer and an electron injection layer stacked in sequence.

9. The display panel according to claim 8, wherein: The cathode layer is prepared from metallic silver or magnesium-silver alloy.

10. A display device, characterized in that: The invention comprises a display panel as claimed in any one of claims 1 to 9.

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