Display panel

Abstract

The utility model provides a display panel. The display panel comprises a substrate; the pixel layer is arranged on one side of the substrate; the refraction layer is arranged on the light emitting side of the pixel layer, and the refraction layer comprises a substrate layer and crystal grains dispersed on the substrate layer. According to the display panel, the refraction layer comprising the crystal grains is arranged on the light emitting side, the refractive index of the refraction layer is adjusted by adjusting the size, the shape and the like of the crystal grains, light paths are adjusted when light passes through the refraction layer, the total reflection loss of an interface is reduced, and therefore the probability that the light passes through the glass cover plate is increased; and the overall light emitting efficiency of the display panel is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of display panels, and more specifically, to a display panel. Background Technology

[0002] Organic light-emitting diode (OLED) display panels boast advantages such as high resolution, high contrast, high response speed, and wide viewing angles. Their high-quality images and portability have garnered significant attention from the industry. The self-emissive nature of OLED display panels allows for a wider viewing angle range, ensuring good display effects from any viewing angle.

[0003] The main factors determining the characteristics of OLED display panels are: luminescent materials, panel structure, and light extraction efficiency (LEE). When light is emitted from a non-perpendicular direction and reaches the optical interface at a certain angle, total internal reflection occurs at the interface during its propagation from an optically denser medium to an optically less dense medium, according to the refractive index relationship. Reducing total internal reflection at the optical interface and improving light extraction efficiency can reduce light loss within the panel and significantly improve the external quantum efficiency of the device. How to reduce spectral shift and angle dependence by adjusting the light propagation path and scattering characteristics has always been a research direction for OLED display panels.

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

[0005] To address the problems in the prior art, the purpose of this utility model is to provide a display panel in which a refractive layer including grains is provided on the light-emitting side. The refractive layer adjusts the path of the emitted light to reduce total internal reflection loss at the interface and improve the overall light emission efficiency of the display panel.

[0006] An embodiment of this utility model provides a display panel, comprising: a display panel, characterized in that it comprises:

[0007] substrate;

[0008] A pixel layer is disposed on one side of the substrate;

[0009] A refractive layer is disposed on the light-emitting side of the pixel layer, and the refractive layer includes a matrix layer and grains dispersed on the matrix layer.

[0010] According to some examples of this invention, the matrix layer is a silicon nitride layer.

[0011] According to some examples of this utility model, the grain is one or more of silicon grains, silicon oxynitride grains, silicon oxide grains, titanium oxide grains, and zirconium oxide grains.

[0012] According to some examples of this invention, the refractive index of the refractive layer is between 1.8 and 2.2.

[0013] According to some examples of this invention, the average grain size of the crystals is between 1 nm and 200 nm.

[0014] According to some examples of the present invention, the grains include both a first grain and a second grain;

[0015] The average grain size of the first grain is different from the average grain size of the second grain; or

[0016] The refractive index of the first grain is different from that of the second grain.

[0017] According to some examples of this utility model, the average grain size of the first grain is different from the average grain size of the second grain, and the difference between the average grain size of the first grain and the average grain size of the second grain is greater than 10%; or

[0018] The refractive index of the first grain is different from that of the second grain, and the difference between the refractive index of the first grain and the refractive index of the second grain is greater than 10%.

[0019] According to some examples of the present invention, the pixel layer includes a first electrode layer, a functional layer and a second electrode layer stacked sequentially on one side of the substrate;

[0020] The refractive index of the refractive layer is greater than or equal to the refractive index of the second electrode layer.

[0021] According to some examples of this utility model, the pixel layer includes a pixel definition area and a light-emitting area;

[0022] The display panel also includes refractive pillars disposed on the pixel definition areas of two adjacent light-emitting areas.

[0023] According to some examples of this utility model, the refractive column is a domed cylindrical structure; or

[0024] The refractive index of the refracting column is between 1.8 and 2.2.

[0025] The display panel of this invention has a refractive layer including grains on the light-emitting side. By adjusting the size and shape of the grains, the refractive index of the refractive layer is adjusted, so that the light path is adjusted when the light passes through the refractive layer, reducing the total internal reflection loss at the interface, thereby increasing the probability of light passing through the glass cover and improving the overall light emission efficiency of the display panel. Attached Figure Description

[0026] The above and other features and advantages of this application will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of the display panel according to the first embodiment of the present invention; and

[0028] Figure 2 This is a schematic diagram of the display panel structure according to the second embodiment of the present invention. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed herein. This utility model can also be implemented or applied through other different specific embodiments. Various details in this utility model can also be modified or changed according to different viewpoints and application systems without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0030] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement it. This utility model can be embodied in many different forms and is not limited to the embodiments described herein.

[0031] In the representation of this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this utility model, as well as features of different embodiments or examples.

[0032] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] To clearly illustrate this utility model, components unrelated to the description are omitted, and the same or similar constituent elements throughout the specification are given the same reference numerals.

[0034] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0035] When we say that a device is "above" another device, this can mean that it is directly above the other device, or it can mean that other devices are present in between. Conversely, when we say that a device is "directly" "above" another device, there are no other devices present in between.

[0036] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude 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” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0037] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of the invention. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in this specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0038] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with relevant technical documents and the content of this present instruction, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0039] The structure of the display panel of this utility model is further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of this utility model.

[0040] Figure 1 This is a schematic diagram of the structure of the display panel according to the first embodiment of the present invention. Specifically, the display panel includes:

[0041] The substrate may include a substrate 1 and a pixel driving layer 11 on one side of the substrate 1. As an example, the substrate 1 may be made of semiconductor material, insulating material, conductive material, or any combination thereof. The substrate 1 may be a single-layer structure or a multi-layer structure. For example, the substrate 1 may be a silicon (Si) substrate, a silicon-germanium (SiGe) substrate, etc.

[0042] A pixel layer is disposed on one side of a substrate. The pixel layer typically includes a first electrode layer 21, a functional layer 22, and a second electrode layer 23 sequentially stacked on one side of the substrate. The first electrode layer and the second electrode layer can be an anode layer and a cathode layer, or a cathode layer and an anode layer, respectively. Taking the first electrode layer 21 and the second electrode layer 23 as an anode layer and a cathode layer, respectively, the functional layer 22 can be a hole injection layer / hole transport layer, an organic light-emitting material layer 222, an electron transport layer / electron injection layer, etc.

[0043] A refractive layer 3 is disposed on the light-emitting side of the pixel layer. The refractive layer 3 includes a matrix layer and grains dispersed on the matrix layer. The matrix layer is a transparent layer and may be a silicon nitride (SiN) layer. x Its thickness can be set according to the structure of the pixel layer of the display panel. The die can be silicon (Si) or silicon oxynitride (Si(ON)) die. x ), silicon dioxide grains (SiO) x Titanium oxide grains (TiO2) and zirconium oxide grains (ZrO2) x One or more of the following: . The grains can be spherulitic, ellipsoidal, or polyhedral, and the grain size ranges from 1 nm to 200 nm. Here, the grain size refers to the average grain size.

[0044] The display panel may also include a vacuum encapsulation layer 8 and a glass cover 9 above the refractive layer 3. Taking a top-emitting display panel design as an example, the refractive layer of this invention is above the second electrode layer 23 (cathode layer). When the refractive index of the refractive layer 3 is greater than or equal to the refractive index of the second electrode layer 23, the light path of the light emitted from the pixel layer is adjusted when it passes through the grains of the high-refractive-index refractive layer. The total internal reflection loss of light can be reduced by designing parameters such as the overall shape of the grains, the number of facets, and the roughness, so that as much light emitted from the pixel layer as possible passes through the glass cover, thereby improving the overall light emission efficiency of the display panel.

[0045] The second electrode layer 23 is typically an alloy layer with good electrical conductivity, such as a magnesium-silver alloy (Mg:Ag) layer, with a refractive index of ~1.7. When the refractive index of the refractive layer 3 is greater than or equal to the refractive index of the second electrode layer, preferably, the refractive index of the refractive layer is between 1.8 and 2.2. The material, size, and overall density of the grains can be selected according to the desired refractive index of the refractive layer. Theoretically, the higher the overall density of the grains, the higher the refractive index of the refractive layer.

[0046] In some embodiments, the grains may include a first grain and a second grain, wherein the average grain size of the first grain is different from that of the second grain, or the refractive index of the first grain is different from that of the second grain. That is, the refractive layer 3 includes two different grains, which may differ in average grain size or refractive index, thereby allowing the refractive layer 3 to further reduce total internal reflection loss. Preferably, the difference between the refractive index of the first grain and the refractive index of the second grain is greater than 10%, and the difference between the average grain size of the first grain and the average grain size of the second grain is greater than 10%. It is understood that the grains are not limited to grains with two different average grain sizes or refractive indices; they may include grains with a greater variety of different average grain sizes or refractive indices.

[0047] Figure 2 This is a schematic diagram of the display panel structure according to the second embodiment of the present invention. The pixel layer includes a pixel definition area A and a light-emitting area B. The light-emitting area B can be a light-emitting area of ​​different colors, such as a red light-emitting area, a blue light-emitting area, or a green light-emitting area. The display panel also includes a refractive pillar 4, which is disposed in the pixel definition area A of two adjacent light-emitting areas. The refractive pillar 4 can be made of silicon nitride, silicon oxide, or silicon oxynitride, and can be a domed cylindrical structure. The refractive index of the refractive pillar 4 can be between 1.8 and 2.2. The structure (such as radial width and height) and refractive index of the refractive pillar 4 can be determined according to the size of the pixel definition area A and the structure of the display panel. The refractive pillar 4 with the above structure can reduce the scattering and loss of oblique light emitted from the light-emitting area B, increase the forward light output, and thus improve the overall light output efficiency.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0049] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A display panel, characterized in that, include: substrate; A pixel layer is disposed on one side of the substrate; A refractive layer is disposed on the light-emitting side of the pixel layer, and the refractive layer includes a matrix layer and grains dispersed on the matrix layer.

2. The display panel according to claim 1, characterized in that, The matrix layer is a silicon nitride layer.

3. The display panel according to claim 1, characterized in that, The grain is one or more of silicon grains, silicon oxynitride grains, silicon oxide grains, titanium oxide grains, and zirconium oxide grains.

4. The display panel according to claim 1, characterized in that, The refractive index of the refractive layer is between 1.8 and 2.

2.

5. The display panel according to claim 1, characterized in that, The average grain size is between 1 nm and 200 nm.

6. The display panel according to claim 1, characterized in that, The grain includes a first grain and a second grain; The average grain size of the first grain is different from the average grain size of the second grain; or The refractive index of the first grain is different from that of the second grain.

7. The display panel according to claim 6, characterized in that, The average grain size of the first grain is different from the average grain size of the second grain, and the difference between the average grain size of the first grain and the average grain size of the second grain is greater than 10%; or The refractive index of the first grain is different from that of the second grain, and the difference between the refractive index of the first grain and the refractive index of the second grain is greater than 10%.

8. The display panel according to claim 1, characterized in that, The pixel layer includes a first electrode layer, a functional layer, and a second electrode layer stacked sequentially on one side of the substrate. The refractive index of the refractive layer is greater than or equal to the refractive index of the second electrode layer.

9. The display panel according to claim 1, characterized in that, The pixel layer includes a pixel definition area and a light-emitting area; The display panel also includes refractive pillars disposed in the pixel definition areas of two adjacent light-emitting areas.

10. The display panel according to claim 9, characterized in that, The refractive column is a domed cylindrical structure; or The refractive index of the refracting column is between 1.8 and 2.2.

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