CN115440779A

CN115440779A - Display panel, manufacturing method thereof and display device

Info

Publication number: CN115440779A
Application number: CN202211116385.9A
Authority: CN
Inventors: 刘彬; 李梦真
Original assignee: Yungu Guan Technology Co Ltd
Current assignee: Yungu Guan Technology Co Ltd
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2022-12-06

Abstract

The application relates to a display panel, a manufacturing method thereof and a display device. The display panel includes: a substrate; a display layer group arranged on one side of the substrate, the display layer group including a first electrode, a second electrode and a plurality of light emitting units; each color filter is correspondingly arranged on one side of one light-emitting unit, which is far away from the substrate, the color filter part is opposite to the light-emitting unit along the thickness direction of the display panel, a hollow part is arranged on each color filter, and the hollow part is opposite to the light-emitting unit along the thickness direction of the display panel, so that light rays meeting a first condition in the light rays emitted by the light-emitting unit can be emitted through the hollow part, and light rays meeting a second condition can pass through the color filters; the first condition is that the included angle between the emergent direction of the light and the normal direction of the substrate is smaller than a specific value, and the second condition is that the included angle between the emergent direction of the light and the normal direction of the substrate is larger than or equal to the specific value.

Description

Display panel, manufacturing method thereof and display device

Technical Field

The present application relates to the field of display technologies, and in particular, to a display panel, a manufacturing method thereof, and a display device.

Background

OLED (Organic Light-Emitting Diode) has been receiving much attention in recent years due to its large application market in the fields of display and illumination. Compared with other display technologies, the OLED display panel has many advantages, such as wide viewing angle, fast response speed, no need of backlight, low power consumption, and capability of implementing flexible display.

However, the OLED display panel still has a perfect space for display effect, for example, there is a significant color shift at a large viewing angle, and the problem is common in the OLED display panel and needs to be improved.

Disclosure of Invention

Accordingly, there is a need for a display panel, a method for fabricating the display panel and a display device to improve the color shift problem under a large viewing angle.

According to an aspect of the present application, there is provided a display panel including:

a substrate;

a display layer group disposed at one side of the substrate, the display layer group including a first electrode, a second electrode, and a plurality of light emitting cells disposed between the first electrode and the second electrode; and

the color filters are correspondingly arranged on one side, away from the substrate, of one light-emitting unit, and the color filter part is opposite to the light-emitting unit along the thickness direction of the display panel;

the color filter is provided with a hollow part, the hollow part and the light-emitting unit are arranged in a manner of being opposite to each other along the thickness direction of the display panel, so that light rays meeting a first condition in light rays emitted by the light-emitting unit can be emitted through the hollow part, and light rays meeting a second condition can be emitted through the color filter;

the first condition is that an included angle between the emergent direction of the light and the normal direction of the substrate is smaller than a specific value, and the second condition is that an included angle between the emergent direction of the light and the normal direction of the substrate is larger than or equal to the specific value.

According to the display panel of the embodiment of the application, for the display layer group, the first electrode and the second electrode form a plurality of optical micro-cavities, and the micro-cavity effect generated by the optical micro-cavities can narrow the electroluminescence spectrum of the light-emitting unit, so that the chromaticity of emergent light of the light-emitting unit is improved. In addition, to the colour cast problem under the wide-angle of view, the display panel of this application embodiment deviates from at every luminescence unit one side correspondence of base plate is provided with color filter, is provided with fretwork portion on the color filter, along display panel thickness direction, color filter portion just right with luminescence unit, another part staggers with luminescence unit, and fretwork portion just right with luminescence unit to in the light that makes luminescence unit send, the light that the contained angle of outgoing direction and base plate normal direction is less than the specified value jets out through fretwork portion, the light that the contained angle of outgoing direction and base plate normal direction is more than or equal to the specified value jets out through color filter. By the arrangement, light rays (emitted along the direction of a large visual angle) with the emergent direction deviating from the normal direction of the substrate are transmitted through the color filter, and emergent light rays with other wave bands caused by the optical microcavity structure under the large visual angle can be filtered by the color filter, so that the problem of serious color cast under the large visual angle can be solved. In addition, the light with the emergent direction deviating from the normal direction of the substrate is small, so that the problem of color cast does not exist, the part of light can be directly emitted through the hollow part without passing through a color filter when being emitted, and the transmittance is favorably improved.

In some embodiments, in the thickness direction of the display panel, the hollow portion is opposite to a middle portion of the light emitting unit, and the color filter portion is opposite to a peripheral portion of the light emitting unit.

In some embodiments, the hollowed-out portion is opposite to a peripheral portion of the light emitting unit, and the color filter portion is opposite to a central portion and a peripheral portion of the light emitting unit in a thickness direction of the display panel.

In some embodiments, the specific value ranges from 40 ° to 50 °.

In some embodiments, the first and second electrodes define a plurality of optical micro-cavities, and the optical micro-cavities have a cavity length equal to 3/2 λ in a thickness direction of the display panel, where λ is a wavelength of light of a corresponding color emitted by a light emitting unit in the optical micro-cavities.

In some embodiments, the light emitting unit includes a first organic light emitting layer and a second organic light emitting layer spaced apart in a thickness direction of the display panel, the first organic light emitting layer is 5/4 λ apart from the first electrode, and the second organic light emitting layer is 3/4 λ apart from the first electrode.

In some embodiments, the first and second electrodes define a plurality of optical micro-cavities, and the optical micro-cavities have a cavity length equal to 2/2 λ in a thickness direction of the display panel, where λ is a wavelength of light of a corresponding color emitted by a light emitting unit in the optical micro-cavities.

In some embodiments, the light emitting unit includes a first organic light emitting layer and a second organic light emitting layer spaced apart in a thickness direction of the display panel, the first organic light emitting layer is spaced apart from the first electrode by a distance of 3/4 λ, and the second organic light emitting layer is spaced apart from the first electrode by a distance of 1/4 λ.

In some embodiments, the plurality of light emitting units includes a first light emitting unit for emitting light of a first color, a second light emitting unit for emitting light of a second color, and a third light emitting unit for emitting light of a third color;

the plurality of color filters comprise a first color filter, a second color filter and a third color filter, the first color filter is arranged on one side of the first light-emitting unit, which is far away from the substrate, the second color filter is arranged on one side of the second light-emitting unit, which is far away from the substrate, and the third color filter is arranged on one side of the third light-emitting unit, which is far away from the substrate.

In some embodiments, the display panel further includes a pixel defining layer on which a plurality of opening portions are disposed, the light emitting unit being disposed in the opening portions, the light emitting unit including a first organic light emitting layer and a second organic light emitting layer disposed at intervals in a thickness direction of the display panel;

the first electrode is arranged between the light-emitting unit and the substrate, the first electrode is a total reflection electrode, the second electrode is arranged on one side of the light-emitting unit far away from the substrate, and the second electrode is a semitransparent electrode or a transparent electrode.

In some embodiments, the display panel further includes an encapsulation layer disposed on a side of the display layer group away from the substrate, and the plurality of color filters are formed on the encapsulation layer.

In some embodiments, a light blocking structure is disposed between adjacent color filters.

According to another aspect of the present application, there is provided a method for manufacturing a display panel, including:

providing a substrate;

forming a display layer group, wherein the display layer group is positioned on one side of the substrate, and the display layer group comprises a first electrode, a second electrode and a plurality of light-emitting units arranged between the first electrode and the second electrode;

forming a plurality of color filters, wherein each color filter is correspondingly arranged on one side of one light-emitting unit, which is far away from the substrate, and the color filter part is opposite to the light-emitting unit along the thickness direction of the display panel; the color filter is provided with a hollow part, the hollow part and the light-emitting unit are arranged in a manner of being opposite to each other along the thickness direction of the display panel, so that light rays meeting a first condition in light rays emitted by the light-emitting unit can be emitted through the hollow part, and light rays meeting a second condition can be emitted through the color filter; the first condition is that an included angle between the emergent direction of the light and the normal direction of the substrate is smaller than a specific value, and the second condition is that an included angle between the emergent direction of the light and the normal direction of the substrate is larger than or equal to the specific value.

According to still another aspect of the present application, there is provided a display device including the display panel in any one of the above embodiments.

Drawings

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present application;

FIG. 2 is a schematic top view of a display panel according to an embodiment of the present application;

FIG. 3 is a partially enlarged schematic view of a display panel according to an embodiment of the present disclosure (arrows indicate light rays);

FIG. 4 is a schematic view of a display panel according to another embodiment of the present application;

FIG. 5 is a schematic top view of a display panel according to another embodiment of the present application;

FIG. 6 is a schematic enlarged view of a portion of a display panel according to another embodiment of the present disclosure (arrows indicate light rays);

fig. 7 is a schematic structural diagram of a light emitting unit in an embodiment of the present application;

fig. 8 is a flowchart illustrating a method for manufacturing a display panel according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In describing positional relationships, unless otherwise specified, when an element such as a layer, film, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Further, when a layer is referred to as being "under" another layer, it can be directly under, or one or more light-emitting units can be present. It will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more light-emitting units can also be present.

Where the terms "comprising," "having," and "including" are used herein, another component may be added unless a specific limiting term is used, such as "only," "consisting of 8230; \8230composition," etc. Unless mentioned to the contrary, singular terms may include the plural and are not to be construed as being one in number.

It will be understood that, although the terms first, second, etc. may be used herein to describe 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 element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.

It will also be understood that when interpreting elements, although not explicitly described, the elements are to be interpreted as including a range of errors which are within the acceptable range of deviation of the particular values as determined by those skilled in the art. For example, "about", "approximately" or "substantially" may mean within one or more standard deviations, and is not limited thereto.

Further, in the specification, the phrase "plane distribution diagram" refers to a drawing when the target portion is viewed from above, and the phrase "sectional diagram" refers to a drawing when a section taken by vertically cutting the target portion is viewed from the side.

Furthermore, the drawings are not 1:1, and the relative dimensions of the various elements in the figures are drawn for illustration only and not necessarily to true scale.

The organic light emitting diode is a display layer group which takes an organic material as a light emitting unit under the action of an electric field. Among them, the OLED can be classified into a Bottom Emitting OLED (Bottom Emitting OLED) and a Top Emitting OLED (Top Emitting OELD).

Taking bottom emission OLED as an example, in the related art, the OLED is fabricated on a substrate provided with a transparent Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO) electrode, and when a voltage is applied to the OLED, light emitted from the OLED is emitted through the transparent ITO (or IZO) electrode. The transparent ITO (or IZO) electrode is connected to a Thin Film Transistor (TFT) for driving the OLED, and the Thin Film Transistor has low light transmittance, so that the problem of competition between the light emitting area of the OLED and the TFT exists, which results in a low Aperture Ratio (Aperture Ratio) of the bottom-emitting OLED. Taking top-emitting OLEDs as an example, in the related art, an opaque total reflection electrode is disposed on a substrate, and then the OLED is manufactured, and when a voltage is applied to the OLED, light is emitted from a top transparent electrode or a translucent cathode. In the top emission OLED, a thin film transistor driving the OLED is positioned under the OLED, so that the problem of low aperture ratio can be fundamentally solved. Therefore, top-emitting OLEDs are often used in products currently manufactured by manufacturers.

Based on the top-emitting OLED, an optical microcavity (resonant cavity) is formed between the total reflection anode and the semitransparent or transparent cathode, and when the cavity length of the optical microcavity and the wavelength of light waves meet a certain relationship, light with specific wavelength can be enhanced, the spectrum is narrowed, and a microcavity effect occurs. The microcavity effect has the effects of selecting, narrowing and enhancing the light source, and is often used to improve the chromaticity of the OLED device, enhance the emission intensity of a specific wavelength, change the emission color of the OLED device, and the like.

In the related art, the microcavity effect includes two interference modes, namely wide-angle interference and multi-beam interference, wherein the wide-angle interference affects the viewing angle characteristics of the OLED device, that is, the light emission peak shifts with the shift of the viewing angle, so that the color shift is severe under a large viewing angle.

If the angle at which the eye is perpendicular to the screen is referred to as a positive viewing angle, the angle may be set to 0 °, and the microcavity effect of the light emitted at the angle is most obvious, that is, the light emitted at the viewing angle is full in color, and no color cast occurs or the color cast does not appear to the human eye. When the eye is tilted to the left or right, the angle is an absolute value, for example, the eye is tilted to the right by 45 °, the angle is 45 °, the eye is tilted to the left by 45 °, and the angle is 45 °. And the large viewing angle can be understood by increasing the angle of the oblique viewing angle to a certain degree, and under the large viewing angle, the luminous peak shifts, resulting in obvious color cast.

In view of the above problems, embodiments of the first aspect of the present application provide a display panel to improve the color shift problem under a large viewing angle.

As shown in fig. 1 to 3 and fig. 4 to 6, the display panel 10 in the first embodiment of the present application includes a substrate 100, a display layer group 200, and a plurality of Color filters (Color filters) 300. Wherein the display layer group 200 is disposed at one side of the substrate 100, and the display layer group 200 includes a first electrode 201, a second electrode 202, and a plurality of light emitting cells 203 disposed between the first electrode 201 and the second electrode 202. Each color filter 300 is correspondingly disposed on a side of one of the light emitting units 203 facing away from the substrate 100. Along the thickness direction of the display panel 10, a part of the color filter 300 is directly opposite to the light emitting unit 203, and the other part is offset from the light emitting unit 203.

The color filter 300 is provided with a hollow portion 301, and the hollow portion 301 and the light emitting unit 203 are arranged opposite to each other along the thickness direction of the display panel 10, so that the light rays meeting the first condition in the light rays emitted by the light emitting unit 203 can be emitted through the hollow portion 301, and the light rays meeting the second condition can be emitted through the color filter 300.

The first condition is that an included angle between the outgoing direction of the light and the normal direction of the substrate 100 is smaller than a specific value, and the second condition is that an included angle between the outgoing direction of the light and the normal direction of the substrate 100 is greater than or equal to a specific value.

It can be understood that the normal direction of the substrate is perpendicular to the surface of the substrate 100. In addition, the first electrode 201 and the second electrode 202 may be understood as electrode layers.

According to the display panel 10 of the embodiment of the application, for the display layer group 200, the first electrode 201 and the second electrode 202 form a plurality of optical micro-cavities, and the micro-cavity effect generated by the optical micro-cavities can narrow the electroluminescence spectrum of the light-emitting unit 203, so that the chromaticity of the emergent light of the light-emitting unit 203 is improved. In addition, for the color shift problem under a large viewing angle, in the display panel 10 according to the embodiment of the present application, a color filter 300 is correspondingly disposed on one side of each light emitting unit 203 away from the substrate 100, a hollow portion 301 is disposed on the color filter 300, along the thickness direction of the display panel 10, a part of the color filter 300 is opposite to the light emitting unit 203, another part is staggered from the light emitting unit 203, and the hollow portion 301 is opposite to the light emitting unit 203, so that, of the light emitted by the light emitting unit 203, the light whose emitting direction and the normal direction of the substrate 100 form an included angle smaller than a specific value is emitted through the hollow portion 301, and the light whose emitting direction and the normal direction of the substrate 100 form an included angle larger than or equal to the specific value is emitted through the color filter 300. With such an arrangement, light rays with a larger emergent direction deviating from the normal direction of the substrate 100 (the light rays are emergent along the direction of a large viewing angle) pass through the color filter 300, and the color filter 300 can filter emergent light of other wave bands caused by the optical microcavity structure under the large viewing angle, so that the problem of serious color cast under the large viewing angle can be solved. In addition, since the light with the emitting direction deviating from the normal direction of the substrate 100 is small, the light does not have the color shift problem, and the light can directly pass through the hollow part 301 without passing through the color filter 300 when the light exits, thereby being beneficial to improving the transmittance.

In some embodiments, particular values of the included angle range from 40 ° to 50 °. That is, the specific value is one of 40 ° to 50 °. Taking the specific value as 45 ° as an example, at this time, the color filter 300 is configured such that, of the light emitted by the light emitting unit 203, the light whose emitting direction and the normal direction of the substrate 100 form an angle smaller than 45 ° is emitted through the hollow portion 301, and the light whose emitting direction and the normal direction of the substrate 100 form an angle larger than or equal to 45 ° passes through the color filter 300. By the arrangement, the problem of serious color cast under a large viewing angle can be remarkably improved.

In some embodiments, referring to fig. 1 to 3, along the thickness direction of the display panel 10, the hollow portion 301 faces a middle portion of the light emitting unit 203, a portion of the color filter 300 faces a peripheral portion of the light emitting unit 203, and another portion of the color filter 300 is offset from the light emitting unit 203. In such a structure, of the light emitted by the light emitting unit 203, the light whose emitting direction deviates from the normal direction of the substrate 100 is larger can pass through the color filter 300, so that the problem of serious color shift under a large viewing angle can be solved.

In other embodiments, referring to fig. 4 to 6, along the thickness direction of the display panel 10, the hollow portion 301 faces the peripheral portion of the light emitting unit 203, a portion of the color filter 300 faces the middle portion and the peripheral portion of the light emitting unit 203, and another portion of the color filter 300 is offset from the light emitting unit 203. In this structure, it is also ensured that light rays having a greater outgoing direction deviating from the normal direction of the substrate 100 can pass through the color filter 300 for the most part, thereby improving the problem of severe color shift at a large viewing angle. In some embodiments, a light blocking structure 400 is disposed between adjacent color filters 300. The light blocking structure 400 enables light emitted from the corresponding light emitting unit 203 to pass through only the color filter 300 corresponding to the light emitting unit 203 without reaching other color filters 300, thereby preventing color mixing of light of different colors.

Specifically, the light blocking structure 400 may be a Black Matrix (Black Matrix), which not only has a blocking effect on the optics, but also can absorb external natural light, thereby preventing the natural light from being reflected to affect the visual effect.

In some embodiments, referring to fig. 3, in the thickness direction of the display panel 10, the hollow portion 301 faces a middle portion of the light emitting unit 203, a portion of the color filter 300 faces a peripheral portion of the light emitting unit 203, another portion of the color filter 300 is offset from the light emitting unit 203, and a light blocking structure 400 is disposed between adjacent color filters 300. Based on this structure, the following requirements can be referred to when designing the size of the color filter 300: assuming that the minimum angle between the light emitted from the edge of the light emitting unit 203 and reaching the edge of the color filter 300 and the normal direction of the substrate 100 is θ, and the maximum angle between the light emitted from the edge of the light emitting unit 203 and reaching the edge of the hollow portion 301 is β, θ may be greater than 0 ° and less than 45 °, and β may be greater than arctan (0.5W/H) and less than 45 °. Thus, the light beams with the included angle between the emitting direction and the normal direction of the substrate 100 being greater than or equal to the specific value all need to pass through the color filter 300, and meanwhile, the size of the hollow portion 301 is not 0 (i.e., the hollow portion 301 is inevitably formed).

In some embodiments, referring to fig. 4, in the thickness direction of the display panel 10, the hollow portion 301 faces a peripheral portion of the light emitting unit 203, a portion of the color filter 300 faces a middle portion and a peripheral portion of the light emitting unit 203, another portion of the color filter 300 is offset from the light emitting unit 203, and a light blocking structure 400 is disposed between adjacent color filters 300. Based on this structure, the following requirements can be referred to in designing the size of the color filter 300: assuming that the minimum included angle between the light emitted from the edge of the light emitting unit 203 and reaching the edge of the color filter 300 and the normal direction of the substrate 100 is θ, and the maximum included angle between the light emitted from the edge of the light emitting unit 203 and reaching the edge of the hollow portion 301 is β, θ may be greater than 0 ° and less than 45 °, and β may be greater than 0 ° and less than 30 °, in this way, the light having the included angle between the emitting direction and the normal direction of the substrate 100 is required to pass through the color filter 300 (the light having the included angle greater than the specific value must also pass through the color filter 300), and meanwhile, it may also be ensured that the size of the hollow portion 301 is not 0 (i.e., the hollow portion 301 must be formed).

In some embodiments, first electrode 201 and second electrode 202 define a plurality of optical microcavities. Along the thickness direction of the display panel 10, the cavity length of the optical microcavity is equal to 3/2 λ, where λ is the wavelength of light of the corresponding color emitted by the light-emitting unit 203 in the optical microcavity. For example, for a light-emitting unit 203 emitting red light, the cavity length of the optical microcavity corresponding to the light-emitting unit 203 is equal to 3/2 of the wavelength of the red light; for the light-emitting unit 203 emitting green light, the cavity length of the optical microcavity corresponding to the light-emitting unit 203 is equal to 3/2 of the wavelength of the green light; for a light-emitting unit 203 emitting blue light, the cavity length of the optical microcavity corresponding to the light-emitting unit 203 is equal to 3/2 of the wavelength of the blue light. I.e., the light-emitting units 203 emitting different colors, the cavity lengths of the corresponding optical micro-cavities are not equal. Here, the cavity length of the optical microcavity may be understood as a distance from a side of the first electrode 201 close to the light emitting unit 203 to a side of the second electrode 202 close to the light emitting unit 203. In this embodiment, the cavity length of the optical microcavity is equal to 3/2 λ, that is, the optical microcavity corresponding to the light-emitting unit 203 is a third-order optical microcavity.

Further, the light emitting unit 203 includes a first organic light emitting layer 2031 and a second organic light emitting layer 2032 spaced apart from each other in the thickness direction of the display panel 10, and the first organic light emitting layer 2031 is spaced apart from the first electrode 201 by 5/4 λ and the second organic light emitting layer 2032 is spaced apart from the first electrode 201 by 3/4 λ based on the optical microcavity corresponding to the light emitting unit 203 adopting a three-order optical microcavity structure. In this embodiment, the light emitting unit 203 includes the first organic light emitting layer 2031 and the second organic light emitting layer 2032, and the first organic light emitting layer 2031 and the second organic light emitting layer 2032 are disposed at an interval in the thickness direction of the display panel 10, that is, the light emitting unit 203 adopts a dual light emitting layer structure, which can improve the maximum luminance and the light emitting efficiency compared to a single light emitting layer structure. In addition, the distance between the first organic light emitting layer 2031 and the first electrode 201 is 5/4 λ, and the distance between the second organic light emitting layer 2032 and the first electrode 201 is 3/4 λ, so that the first organic light emitting layer 2031 and the second organic light emitting layer 2032 are respectively located at two optical enhancements (also called as antinodes of standing wave) in the three-order optical microcavity, thereby being beneficial to improving the light emitting luminance and the light emitting efficiency of the light emitting unit 203. Further, a strong surface plasmon polariton (surface plasmon polariton) exists near the total reflection electrode, and the light emission efficiency of the light emitting layer close to the total reflection electrode is reduced by the surface plasmon polariton. In this embodiment, the first organic light emitting layer 2031 and the second organic light emitting layer 2032 are both away from the total reflection electrode, and thus, the influence of surface plasmon polariton can be avoided, thereby avoiding the problem of the decrease in light emitting efficiency.

In other embodiments, the first electrode 201 and the second electrode 202 define a plurality of optical microcavities. Along the thickness direction of the display panel 10, the cavity length of the optical microcavity is equal to 2/2 λ, where λ is the wavelength of light of the corresponding color emitted by the light-emitting unit 203 in the optical microcavity. For example, for a light-emitting unit 203 emitting red light, the cavity length of the optical microcavity corresponding to the light-emitting unit 203 is equal to 2/2 of the wavelength of the red light; for the light-emitting unit 203 emitting green light, the cavity length of the optical microcavity corresponding to the light-emitting unit 203 is equal to 2/2 of the wavelength of the green light; for a light-emitting unit 203 emitting blue light, the cavity length of the optical microcavity corresponding to the light-emitting unit 203 is equal to 2/2 of the wavelength of the blue light. I.e., the light-emitting units 203 emitting different colors, the cavity lengths of the corresponding optical micro-cavities are not equal. In this embodiment, the cavity length of the optical microcavity is equal to 2/2 λ, that is, the optical microcavity corresponding to the light-emitting unit 203 is a second-order optical microcavity.

Further, the light emitting unit 203 includes a first organic light emitting layer 2031 and a second organic light emitting layer 2032 disposed at an interval in a thickness direction of the display panel 10, and a second order optical microcavity structure is adopted based on an optical microcavity corresponding to the light emitting unit 203, the first organic light emitting layer 2031 is at a distance of 3/4 λ from the first electrode 201, and the second organic light emitting layer 2032 is at a distance of 1/4 λ from the first electrode 201. In this embodiment, the light emitting unit 203 includes the first organic light emitting layer 2031 and the second organic light emitting layer 2032, and the first organic light emitting layer 2031 and the second organic light emitting layer 2032 are disposed at intervals in the thickness direction of the display panel 10, that is, the light emitting unit 203 adopts a dual light emitting layer structure, which can improve the maximum luminance and the light emitting efficiency compared to a single light emitting layer structure. In addition, the distance between the first organic light emitting layer 2031 and the first electrode 201 is 3/4 λ, and the distance between the second organic light emitting layer 2032 and the first electrode 201 is 1/4 λ, so that the first organic light emitting layer 2031 and the second organic light emitting layer 2032 are respectively located at two optical enhancements (also called antinodes of standing waves) in the second-order optical microcavity, thereby being beneficial to improving the light emission luminance and the light emission efficiency of the light emitting unit 203.

In some embodiments, the plurality of light emitting units 203 includes a first light emitting unit 203a for emitting light of a first color, a second light emitting unit 203b for emitting light of a second color, and a third light emitting unit 203c for emitting light of a third color. The plurality of color filters 300 includes a first color filter 300a, a second color filter 300b, and a third color filter 300c, the first color filter 300a is disposed on a side of the first light emitting unit 203a facing away from the substrate 100, the second color filter 300b is disposed on a side of the second light emitting unit 203b facing away from the substrate 100, and the third color filter 300c is disposed on a side of the third light emitting unit 203c facing away from the substrate 100.

It is understood that the first, second and third colors are different three colors. In one particular example, the first color is one of red, green, and blue; the second color is one of red, green, and blue and is different from the first color; the third color is one of red, green, and blue and is different from the first color and the second color. For example, the first color is red, the second color is green, and the third color is blue; as another example, the first color is blue, the second color is green, the third color is red, and so on.

That is, there are three kinds of light emitting units 203 in the display panel 10 according to the color of the emitted light, and each of the light emitting units 203 emits light of one color. Correspondingly, the color filters 300 also include three color filters 300. When the color filter 300 is disposed, a color correspondence relationship is maintained between the color filter 300 and the light-emitting unit 203, that is, a first color filter 300a is disposed on a side of the first light-emitting unit 203a emitting the first color light, the second color filter 300b is disposed on a side of the second light-emitting unit 203b emitting the second color light, the third color filter 300c is disposed on a side of the third light-emitting unit 203c emitting the third color light, the side being away from the substrate 100, and the first light-emitting unit 203a emitting the first color light is disposed on the substrate 100. By the arrangement, the problem of color cast under a large viewing angle can be solved by the sub-pixels of each color.

In some embodiments, the display panel 10 further includes a pixel defining layer 500, the pixel defining layer 500 is provided with a plurality of opening portions, and the light emitting units 203 are disposed in the opening portions. The light emitting unit 203 includes a first organic light emitting layer 2031 and a second organic light emitting layer 2032 disposed at an interval in a thickness direction of the display panel 10. The first electrode 201 is disposed between the substrate 100 and the light emitting unit 203, the second electrode 202 is disposed on a side of the light emitting unit 203 away from the substrate 100, the first electrode 201 is a total reflection electrode, and the second electrode 202 is a translucent electrode or a transparent electrode. It is understood that each opening portion of the pixel defining layer 500 defines one sub-pixel region. In this embodiment, the first electrode 201 is disposed close to the substrate 100 and is a total reflection electrode, the second electrode 202 is disposed away from the substrate 100 and is a semi-transparent electrode or a transparent electrode, and the light emitting unit 203 emits light from a side where the second electrode 202 is located. That is, the display panel in this embodiment adopts a top-emitting OLED device structure. In addition, the light emitting unit 203 includes a first organic light emitting layer 2031 and a second organic light emitting layer 2032, and the first organic light emitting layer 2031 and the second organic light emitting layer 2032 are disposed at an interval in a thickness direction of the display panel 10, that is, the light emitting unit 203 adopts a dual light emitting layer structure, which can improve maximum luminance and light emitting efficiency compared to a single light emitting layer structure.

In some embodiments, as shown in fig. 7, the light emitting unit 203 further includes a first hole injection layer 2034, a first hole transport layer 2035, a first electron transport layer 2036, a first electron injection layer 2037, a charge generation layer 2038, a second hole injection layer 2039, a second hole transport layer 2040, a second electron transport layer 2041, and a second electron injection layer 2042. From the side close to the substrate 100 to the side far away from the substrate 100, the film layers in the display layer group 200 are sequentially arranged as follows: a first electrode 201, a first hole injection layer 2034, a first hole transport layer 2035, a second organic light emitting layer 2032, a first electron transport layer 2036, a first electron injection layer 2037, a charge generation layer 2038, a second hole injection layer 2039, a second hole transport layer 2040, a first organic light emitting layer 2031, a second electron transport layer 2041, a second electron injection layer 2042, and a second electrode 202.

In some embodiments, the display panel 10 further includes a plurality of thin film transistors 600 arranged in an array, each of the thin film transistors being configured to control one of the light emitting units 203 to emit light or not to emit light. Specifically, the thin film transistor 600 may include an active layer 601, a gate electrode 602, a source electrode 603, and a drain electrode 604. The electrode on the side close to the substrate 100 of the first electrode 201 and the second electrode 202 may be electrically connected to the source electrode 603 or the drain electrode 604 of the thin film transistor 600 through a conductive material, and the electrode on the side away from the substrate 100 of the first electrode 201 and the second electrode 202 may be a continuous whole layer. The thin film transistor 600 may be a top gate type or a bottom gate type, which is not limited in this application.

In some embodiments, the display panel 10 further includes an encapsulation layer 700, the encapsulation layer 700 is disposed on a side of the display layer group 200 away from the substrate 100, and the plurality of color filters 300 are formed on the encapsulation layer 700. Since the light emitting unit 203 is sensitive to moisture, oxygen, and other environments, if the light emitting unit 203 of the display panel 10 is exposed to moisture or oxygen, the performance of the display panel 10 may be drastically reduced or seriously damaged. The display panel 10 is provided with the encapsulation layer 700 capable of blocking moisture and air to ensure the performance reliability of the display panel 10. In addition, since the color filter 300 does not require moisture and oxygen isolation, the color filter 300 may be formed on the encapsulation layer 700.

It is understood that the encapsulation layer 700 may be a thin film encapsulation layer, wherein the thin film encapsulation layer may be one or more layers of a structure, and may be an organic film layer or an inorganic film layer. In a preferred embodiment, the encapsulation layer 700 is a stacked structure of an organic encapsulation layer and an inorganic encapsulation layer, the organic encapsulation layer provides flexibility, and the inorganic encapsulation layer functions to isolate water and oxygen. For example, the thin film encapsulation layer may include two inorganic encapsulation film layers and an organic encapsulation film layer located between the two inorganic encapsulation film layers.

As shown in fig. 8, an embodiment of the second aspect of the present application proposes a manufacturing method of a display panel 10, the manufacturing method including:

step S110: providing a substrate 100;

step S120: forming a plurality of display layer groups 200, wherein the display layer group 200 is positioned at one side of the substrate 100, and the display layer group 200 includes a first electrode 201, a second electrode 202, and a plurality of light emitting cells 203 disposed between the first electrode 201 and the second electrode 202;

step S130: forming a plurality of color filters 300, wherein each color filter 300 is correspondingly arranged on one side of one light-emitting unit 203, which is far away from the substrate 100, and the color filter 300 is partially opposite to the light-emitting unit 203 along the thickness direction of the display panel 10; wherein, be provided with fretwork portion 301 on color filter 300, follow display panel 10's thickness direction, fretwork portion 301 with luminescence unit 203 is just to setting up, so that satisfy the light of first condition in the light that luminescence unit 203 sent can pass through fretwork portion 301 jets out, and the light that satisfies the second condition can pass through color filter 300 jets out, the first condition be the outgoing direction of light with the contained angle of the normal direction of base plate 100 is less than the particular value, the second condition be the outgoing direction of light with the contained angle of the normal direction of base plate 100 is greater than or equal to the particular value.

According to the method for manufacturing the display panel 10 of the embodiment of the application, the first electrode 201 and the second electrode 202 of the display layer group 200 of the manufactured display panel 10 form a plurality of optical micro-cavities, and the electroluminescence spectrum of the light-emitting unit 203 can be narrowed by using the micro-cavity effect generated by the optical micro-cavities, so that the chromaticity of the emergent light of the light-emitting unit 203 is improved. In addition, for the color shift problem under a large viewing angle, the display panel 10 is provided with a color filter 300 on one side of each light emitting unit 203 away from the substrate 100, the color filter 300 is provided with a hollow portion 301, along the thickness direction of the display panel 10, part of the color filter 300 is opposite to the light emitting unit 203, the other part is staggered with the light emitting unit 203, and the hollow portion 301 is opposite to the light emitting unit 203, so that light rays, of which the included angle between the outgoing direction and the normal direction of the substrate 100 is smaller than a specific value, of the light rays emitted by the light emitting unit 203 are emitted through the hollow portion 301, and light rays, of which the included angle between the outgoing direction and the normal direction of the substrate 100 is greater than or equal to the specific value, are emitted through the color filter 300. With such an arrangement, light rays with a larger emergent direction deviating from the normal direction of the substrate 100 (the light rays are emergent along the direction of a large viewing angle) pass through the color filter 300, and the color filter 300 can filter emergent light of other wave bands caused by the optical microcavity structure under the large viewing angle, so that the problem of serious color cast under the large viewing angle can be solved. In addition, since the light with the emitting direction deviating from the normal direction of the substrate 100 is small, the light does not have the color shift problem, and the light can be directly emitted through the hollow part 301 without passing through the color filter 300 when being emitted, thereby being beneficial to improving the transmittance.

An embodiment of the third aspect of the present application proposes a display device, which includes the display panel 10 in any of the embodiments of the first aspect. The display device may be any product or component having a display function, such as a display, a television, a digital camera, a mobile phone, a tablet computer, and a navigator.

According to the display device in the embodiment of the present application, the same inventive concept as the display panel 10 in the embodiment of the first aspect described above has the same advantageous effects as the display panel 10 in the embodiment of the first aspect described above.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A display panel, comprising:

a substrate;

the first condition is that an included angle between the emergent direction of the light and the normal direction of the substrate is smaller than a specific value, and the second condition is that the included angle between the emergent direction of the light and the normal direction of the substrate is larger than or equal to the specific value.

2. The display panel according to claim 1, wherein the hollow portion is opposite to a central portion of the light emitting unit, and the color filter portion is opposite to a peripheral portion of the light emitting unit in a thickness direction of the display panel.

3. The display panel according to claim 1, wherein the hollowed-out portion faces a peripheral portion of the light emitting unit, and the color filter portion faces a central portion and a peripheral portion of the light emitting unit in a thickness direction of the display panel.

4. The display panel according to claim 1, wherein the specific value is in a range of 40 ° to 50 °.

5. The display panel according to claim 1, wherein the first and second electrodes define a plurality of optical micro-cavities having a cavity length equal to 3/2 λ in a thickness direction of the display panel, λ being a wavelength of light of a corresponding color emitted by a light emitting unit in the optical micro-cavities;

preferably, the light emitting unit includes a first organic light emitting layer and a second organic light emitting layer spaced apart from each other in a thickness direction of the display panel, a distance between the first organic light emitting layer and the first electrode is 5/4 λ, and a distance between the second organic light emitting layer and the first electrode is 3/4 λ.

6. The display panel according to claim 1, wherein the first and second electrodes define a plurality of optical micro-cavities having a cavity length equal to 2/2 λ in a thickness direction of the display panel, λ being a wavelength of light of a corresponding color emitted by a light emitting unit in the optical micro-cavities;

preferably, the light emitting unit includes a first organic light emitting layer and a second organic light emitting layer spaced apart from each other in a thickness direction of the display panel, a distance between the first organic light emitting layer and the first electrode is 3/4 λ, and a distance between the second organic light emitting layer and the first electrode is 1/4 λ.

7. The display panel according to claim 1, wherein the plurality of light-emitting units include a first light-emitting unit for emitting light of a first color, a second light-emitting unit for emitting light of a second color, and a third light-emitting unit for emitting light of a third color;

the plurality of color filters comprise a first color filter, a second color filter and a third color filter, the first color filter is arranged on one side of the first light-emitting unit, which is far away from the substrate, the second color filter is arranged on one side of the second light-emitting unit, which is far away from the substrate, and the third color filter is arranged on one side of the third light-emitting unit, which is far away from the substrate;

preferably, the display panel further includes a pixel defining layer having a plurality of openings, the light emitting unit being disposed in the openings, the light emitting unit including a first organic light emitting layer and a second organic light emitting layer spaced apart from each other in a thickness direction of the display panel;

the first electrode is arranged between the light-emitting unit and the substrate, the first electrode is a total reflection electrode, the second electrode is arranged on one side, far away from the substrate, of the light-emitting unit, and the second electrode is a semitransparent electrode or a transparent electrode.

8. The display panel according to any one of claims 1 to 7, wherein the display panel further comprises an encapsulation layer provided on a side of the display layer group away from the substrate, the plurality of color filters being formed on the encapsulation layer;

and/or a light blocking structure is arranged between the adjacent color filters.

9. A method for manufacturing a display panel is characterized by comprising the following steps:

providing a substrate;

forming a display layer group, wherein the display layer group is positioned on one side of the substrate, and the display layer group comprises a first electrode, a second electrode and a plurality of light emitting units arranged between the first electrode and the second electrode;

forming a plurality of color filters, wherein each color filter is correspondingly arranged on one side of one light-emitting unit, which is far away from the substrate, and the color filter part is opposite to the light-emitting unit along the thickness direction of the display panel; the color filter is provided with a hollow part, and the hollow part is arranged opposite to the light-emitting unit along the thickness direction of the display panel, so that light rays meeting a first condition in light rays emitted by the light-emitting unit can be emitted through the hollow part, and light rays meeting a second condition can be emitted through the color filter; the first condition is that an included angle between the emergent direction of the light and the normal direction of the substrate is smaller than a specific value, and the second condition is that an included angle between the emergent direction of the light and the normal direction of the substrate is larger than or equal to the specific value.

10. A display device characterized by comprising the display panel according to any one of claims 1 to 8.