Display panel, preparation method and display device

Abstract

The embodiment of the invention provides a display panel, a preparation method and a display device, relates to the technical field of display, and is used for reducing the power consumption of the display panel. The display panel comprises a substrate, a blue light emitting device and a Bragg reflection layer. The blue light-emitting device is located on one side of the substrate; the blue light emitting device includes a first electrode and a second electrode. The first electrode is a transparent electrode; the second electrode is located on the side, away from the substrate, of the first electrode and is opposite to the first electrode. The second electrode is a semi-transparent and semi-reflective electrode; the Bragg reflection layer is located between the first electrode and the substrate and is in contact with the first electrode; the Bragg reflection layer comprises at least one group of Bragg reflection sub-layers, and the group of Bragg reflection sub-layers comprises a first sub-layer and a second sub-layer which are arranged in a stacked mode in the direction from the Bragg reflection layer to the substrate; the refractive indexes of the first sub-layer and the second sub-layer are different, and the reflectivity of the Bragg reflection layer to blue light is larger than that of metal to blue light. The display panel is used for displaying images.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and in particular, to a display panel, a preparation method thereof, and a display device. Background Art

[0002] With the development of display technologies, display devices (such as mobile phones, laptop computers, or tablet computers, etc.) are increasingly applied to people's lives. Among them, organic light-emitting diode (English: Organic Light-Emitting Diode, abbreviated as: OLED) display devices have the advantages of active light emission, wide viewing angle, high contrast ratio, fast response speed, low power consumption, ultra-thinness, etc., and thus have received wide attention. Among them, how to reduce the power consumption of display devices is a technical problem that needs to be solved urgently in the industry. Summary of the Invention

[0003] The purpose of the embodiments of the present disclosure is to provide a display panel, a preparation method thereof, and a display device, which are used to reduce the power consumption of the display panel.

[0004] To achieve the above purpose, the embodiments of the present disclosure provide the following technical solutions:

[0005] On the one hand, a display panel is provided. The display panel includes a substrate, a blue light-emitting device, and a Bragg reflection layer. The blue light-emitting device is located on one side of the substrate; the blue light-emitting device includes a first electrode and a second electrode. The first electrode is a transparent electrode; the second electrode is located on the side of the first electrode away from the substrate and is disposed opposite to the first electrode; the second electrode is a semi-transmissive and semi-reflective electrode; the Bragg reflection layer is located between the first electrode and the substrate and is in contact with the first electrode; the Bragg reflection layer includes at least one group of Bragg reflection sub-layers. Along the direction from the Bragg reflection layer to the substrate, the group of Bragg reflection sub-layers includes a first sub-layer and a second sub-layer stacked; the refractive indices of the first sub-layer and the second sub-layer are different, and the reflectivity of the Bragg reflection layer to blue light is greater than the reflectivity of metal to blue light.

[0006] In the above display panel, the anode of the blue light-emitting device is a transparent electrode. Blue light passes through the anode 2021 of the blue light-emitting device and shines on the Bragg reflection layer. The reflectivity of the Bragg reflection layer to blue light is greater than the reflectivity of metal to blue light. More blue light is reflected by the Bragg reflection layer, which is beneficial to improving the light extraction amount of blue light. The current flowing through the blue light-emitting device 221 can be reduced, the power consumption of the blue light-emitting device 221 can be reduced, and the power consumption of the display panel 100 can be reduced.

[0007] In some embodiments, the display panel further includes a pixel defining layer located between the Bragg reflection layer and the substrate. The pixel defining layer has a first opening, and the first electrode is located within the first opening; the Bragg reflection layer covers the bottom wall and sidewalls of the first opening.

[0008] In some embodiments, the angle formed between the surface of the Bragg reflection layer away from the sidewall of the first opening and the substrate is 30° to 80°.

[0009] In some embodiments, the display panel further includes spacers located on the side of the pixel defining layer away from the substrate; the orthographic projection of the spacers on the substrate is staggeredly arranged with respect to the orthographic projection of the first opening on the substrate; wherein, the spacers and the Bragg reflection layer are made of the same material and are provided in the same layer.

[0010] In some embodiments, the thickness of the Bragg reflection layer is 1 μm to 2 μm.

[0011] In some embodiments, the refractive index of the first sub-layer is less than the refractive index of the second sub-layer.

[0012] In some embodiments, the refractive index of the first sub-layer is 1.1 to 1.7; and / or, the refractive index of the second sub-layer is 1.7 to 2.4.

[0013] In some embodiments, the display panel further includes a red light-emitting device. The red light-emitting device is located on the side of the substrate close to the blue light-emitting device; the red light-emitting device includes a third electrode and a fourth electrode. In the direction from the substrate towards the red light-emitting device, the third electrode includes a first sub-pole, a second sub-pole, and a first sub-pole stacked; the material of the first sub-pole is the same as the material of the first electrode, and the thickness of the first electrode is greater than the thickness of the first sub-pole; the second sub-pole is a reflective electrode; the fourth electrode is located on the side of the third electrode away from the substrate and is opposite to the third electrode; the fourth electrode is a semi-transmissive and semi-reflective electrode.

[0014] In some embodiments, the thickness of the first sub-pole is 10 nm to 20 nm, and / or, the thickness of the first electrode is 20 nm to 40 nm.

[0015] On the other hand, a display device is provided. The display device includes: the display panel according to any one of the above embodiments.

[0016] The above display device has the same structure and beneficial technical effects as the display panel provided in some of the above embodiments, and will not be elaborated herein.

[0017] In another aspect, a method for manufacturing a display panel is provided. The method is used to manufacture the display panel as described in any of the above embodiments. The manufacturing method includes: forming a Bragg reflection layer on a substrate; the Bragg reflection layer includes at least one group of Bragg reflection sub-layers, and along the direction from the Bragg reflection layer towards the substrate, the group of Bragg reflection sub-layers includes a first sub-layer and a second sub-layer arranged in a stacked manner; the refractive indices of the first sub-layer and the second sub-layer are different; forming a blue light-emitting device on the side of the Bragg reflection layer away from the substrate; the blue light-emitting device includes a first electrode and a second electrode, the first electrode is a transparent electrode and is in contact with the Bragg reflection layer; the second electrode is located between the first electrode and the substrate and is disposed opposite to the first electrode; the second electrode is a semi-transmissive and semi-reflective electrode.

[0018] In some embodiments, before forming the Bragg reflection layer on the substrate, the manufacturing method further includes: forming a pixel defining layer; the pixel defining layer is located between the Bragg reflection layer and the substrate, the pixel defining layer has a first opening, and the first electrode is located within the first opening; the orthographic projection of the Bragg reflection layer on the substrate covers the orthographic projection of the first opening on the substrate, and the Bragg reflection layer covers the sidewall of the first opening.

[0019] In some embodiments, during the process of forming the Bragg reflection layer on the substrate, spacers are also formed; the spacers are located on the side of the pixel defining layer away from the substrate; the orthographic projection of the spacers on the substrate overlaps with the orthographic projection of the pixel defining layer on the substrate. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the present disclosure, the drawings required for use in some embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings in the following description are only the drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and do not limit the actual dimensions of the products, the actual processes of the methods, the actual timings of the signals, etc. involved in the embodiments of the present disclosure.

[0021] Figure 1A FIG. 1A is a structural diagram of a display device according to some embodiments;

[0022] Figure 1B FIG. 1B is another structural diagram of a display device according to some embodiments;

[0023] Figure 2 FIG. 1C is a cross-sectional view taken along section line A-A in FIG. 1A;

[0024] Figure 3Cross-sectional view along section line B-B in 1A;

[0025] Figure 4 Structural diagram of a Bragg reflection layer according to some embodiments;

[0026] Figure 5 Structural diagram of a third electrode or a fifth electrode according to some embodiments;

[0027] Figure 6 and Figure 7 Flow chart of a method for manufacturing a display panel according to some embodiments. Detailed implementation manners

[0028] The technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are only a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present disclosure shall fall within the protection scope of the present disclosure.

[0029] Unless otherwise required by the context, the term "comprising" is interpreted in an open, inclusive sense throughout the specification and the claims, i.e., "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples" or "some examples", etc., are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms are not necessarily directed to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0030] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] In describing some embodiments, the terms "coupled" and "connected" and their derivatives may be used. The term "connected" should be understood broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates, for example, that two or more components have direct physical contact or electrical contact. The term "coupled" or "communicatively coupled" may also mean that two or more components do not have direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0032] "At least one of A, B, and C" has the same meaning as "at least one of A, B, or C", and both include the following combinations of A, B, and C: only A, only B, only C, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0033] "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0034] As used herein, depending on the context, the term "if" is optionally interpreted to mean "when" or "at the time of" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if it is determined that..." or "if [the stated condition or event] is detected" is optionally interpreted to mean "when it is determined that..." or "in response to determining..." or "at the time of detecting [the stated condition or event]" or "in response to detecting [the stated condition or event]".

[0035] The use of "configured to" or "adapted to" herein means open and inclusive language, which does not exclude devices that are configured to or adapted to perform additional tasks or steps.

[0036] In addition, the use of "based on" means open and inclusive, because a process, step, calculation, or other action "based on" one or more of the stated conditions or values can, in practice, be based on additional conditions or values beyond the stated ones.

[0037] As used herein, "about", "substantially", or "approximately" includes the stated value and the average value within an acceptable deviation range of the specific value, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurement being discussed and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

[0038] As used herein, "parallel", "perpendicular", and "equal" include the stated cases and cases similar to the stated cases, where the range of such similar cases is within an acceptable deviation range, and the acceptable deviation range is determined by a person of ordinary skill in the art considering the measurements being discussed and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism can be, for example, within a deviation of 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity can also be, for example, within a deviation of 5°. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range for approximate equality can be, for example, that the difference between the two equal values is less than or equal to 5% of either one of them.

[0039] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can be that the layer or element is directly on the other layer or substrate, or there can be an intermediate layer between the layer or element and the other layer or substrate.

[0040] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of the regions are enlarged for clarity. Thus, variations in the shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances can be envisioned. Therefore, the exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but include shape deviations caused, for example, by manufacturing. For example, an etched region shown as rectangular will generally have curved features. Thus, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shape of the regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0041] As Figure 1A and Figure 1B As shown, some embodiments of the present disclosure provide a display device 1000, and the display device 1000 can be any device that displays whether it is moving (e.g., video) or stationary (e.g., a still image) and whether it is text or an image.

[0042] Exemplarily, the display device 1000 can be a television, a laptop computer, a tablet computer, a mobile phone, a personal digital assistant (abbreviation: PDA), a navigator, a wearable device, an augmented reality (abbreviation: AR) device, a virtual reality (abbreviation: VR) device, an in-vehicle display, a flight display, or any other product or component having a display function.

[0043] In some examples, such as Figure 1A shown, the display device 1000 can be a portable display product. For example, the display device 1000 can be a Figure 1A mobile phone as shown.

[0044] In still other examples, such as Figure 1B shown, the display device 1000 can be a wearable device. For example, the display device 1000 can be a Figure 1B watch as shown.

[0045] In some embodiments, such as Figure 2 shown, the display device 1000 includes a display panel 100, a driving circuit board 200, a housing 300, and a cover plate 400.

[0046] Among them, the display panel 100 has opposite light-emitting side 100A and non-light-emitting side 100B. The light-emitting side 100A refers to the side of the display panel 100 that can emit light ( Figure 2 the upper side of the display panel 100 in Figure 2 ), and the non-light-emitting side 100B refers to the other side opposite to the light-emitting side 100A (

[0047] the lower side of the display panel 100 in

[0048] The driving circuit board 200 is disposed on the non-light-emitting side 100B of the display panel 100 and is connected to the display panel 100 to provide a light-emitting signal to the display panel 100.

[0049] Such as Figure 2 shown, the longitudinal section of the housing 300 can be, for example, U-shaped. The display panel 100 and the driving circuit board 200 are disposed in the housing 300, and the cover plate 400 is disposed at the opening of the housing 300.

[0050] The types of the above display panel 100 include multiple types, and can be selected and set according to actual needs.

[0051] Exemplarily, the above display panel 100 may be: an organic light-emitting diode (OLED) display panel, a quantum dot light-emitting diode (QLED) display panel, an active matrix organic light-emitting diode (AMOLED) display panel, etc. The embodiments of the present disclosure do not make specific limitations herein.

[0052] Taking the above display panel 100 as an OLED display panel as an example, some embodiments of the present disclosure will be schematically described below.

[0053] In some embodiments, as Figure 2 and Figure 3 shown, the display panel 100 includes a substrate 10 and a plurality of sub-pixels 20.

[0054] The material used for the above substrate 10 may include polymer resin or glass. Exemplarily, the substrate 10 may be flexible, and the material used for the substrate 10 includes polymer resin, such as polyethersulfone (PES), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate two formic acid glycol ester (PEN), polyethylene terephthalate (PET), polyphenyl sulfide granula (PPS), polyimide (PI), polycarbonate (PC), and cellulose acetate propionate (CAP). Exemplarily, the substrate 10 may be rigid and include a glass material containing SiO 2 as the main component.

[0055] In some examples, a plurality of sub-pixels 20 are disposed on a substrate 10. The plurality of sub-pixels 20 can be arranged in multiple rows and multiple columns, for example. Each row of sub-pixels 20 includes at least two sub-pixels 20 arranged along a first direction X, and each column of sub-pixels 20 includes at least two sub-pixels 20 arranged along a second direction Y. Herein, the first direction X intersects with the second direction Y. For example, the first direction X is perpendicular to the second direction Y.

[0056] In some embodiments, the above-mentioned plurality of sub-pixels 20 may include red sub-pixels 21, blue sub-pixels 22, and green sub-pixels 23. Each sub-pixel 20 includes a pixel circuit 201 and a light-emitting device 202 disposed on the substrate 10. That is, the red sub-pixel 21 includes the pixel circuit 201 and a red light-emitting device 211, the blue sub-pixel 22 includes the pixel circuit 201 and a blue light-emitting device 221, and the green sub-pixel 23 includes the pixel circuit 201 and a green light-emitting device 231.

[0057] In some embodiments, along a direction away from and perpendicular to the substrate 10, the light-emitting device 202 includes an anode 2021, a light-emitting functional part 2022, and a cathode 2023 stacked in sequence. Among them, the anode 2021 is used to reflect light rays incident on the anode 2021.

[0058] In some examples, the anode 2021 is a stacked structure, and the anode 2021 includes indium tin oxide (English: Indium Tin Oxide, abbreviation: ITO), Ag, and ITO stacked.

[0059] The cathode 2023 is a semi-transmissive and semi-reflective electrode. The semi-transmissive and semi-reflective electrode is used to reflect part of the light rays incident on the cathode 2023 and also used to transmit part of the light rays incident on the cathode 2023. Herein, the semi-transmissive and semi-reflective electrode refers to an electrode with a reflectivity of 50% to 60%. In this way, the anode 2021 and the cathode 2023 form a resonant cavity. The light-emitting functional part 2022 is located between the anode 2021 and the cathode 2023, that is, the light-emitting functional part 2022 is located in the resonant cavity. The intensity of light with a certain wavelength emitted by the light-emitting functional part 2022 will be increased, and the spectrum of the light with a certain wavelength is narrowed. The resonant cavity can enable most of the light rays emitted by the light-emitting functional part 2022 to be emitted from the display panel 100, improving the light-emitting efficiency of the light-emitting device 202.

[0060] In some examples, the material of the semi-transmissive and semi-reflective electrode includes indium zinc oxide (English: Indium Zinc Oxide, abbreviation: IZO) or zinc oxide (abbreviation: ZnO).

[0061] The above-mentioned light-emitting functional part 2022 may only include a light-emitting layer, or may include at least one of an electron transport layer (abbreviation: ETL), an electron injection layer (abbreviation: EIL), a hole blocking layer (abbreviation: HBL), a hole transport layer (abbreviation: HTL), a hole injection layer (abbreviation: HIL), and an electron blocking layer (abbreviation: EBL) in addition to the light-emitting layer.

[0062] In the related art, the power consumption of the display panel is relatively high. The inventor's research found that the anode includes a metal reflective electrode, and the reflectivity of the metal reflective electrode to blue light (400 nm to 500 nm) is relatively low (for example, when the material of the reflective electrode includes silver, the reflectivity of the reflective electrode to blue light is 92%, and the reflectivity to red light and green light is 98%). That is, the reflective electrode will absorb part of the blue light, and there will be a half-wave loss when the blue light hits the reflective electrode, resulting in less blue light reflected by the reflective electrode, less light output of the blue light, a larger current flowing through the blue light-emitting device, resulting in a higher power consumption of the blue light-emitting device, a higher power consumption of the display panel, and a higher power consumption of the display device.

[0063] To solve the above technical problems, some embodiments of the present disclosure provide a display panel 100, as Figure 3 shown, the blue light-emitting device 221 in the display panel 100 includes a first electrode 2211 and a second electrode 2212. The first electrode 2211 is a transparent electrode (an electrode with a light transmittance greater than or equal to 85%). The second electrode 2212 is located on the side of the first electrode 2211 away from the substrate 10 and is disposed opposite to the first electrode 2211. The second electrode 2212 is a semi-transmissive and semi-reflective electrode. The above-mentioned first electrode 2211 is the anode 2021 of the blue light-emitting device 221, and the second electrode 2212 is the cathode 2023 of the blue light-emitting device 221.

[0064] In addition, as Figure 3 and Figure 4As shown, the display panel 100 further includes a Bragg reflection layer 30. The Bragg reflection layer 30 is located between the first electrode 2211 and the substrate 10 and is in contact with the first electrode 2211. At this time, the Bragg reflection layer 30 and the first electrode 2211 form a resonant cavity. The Bragg reflection layer 30 includes at least one group of Bragg reflection sub-layers 31. Along the direction from the Bragg reflection layer 30 to the substrate 10, one group of Bragg reflection sub-layers 31 includes a first sub-layer 311 and a second sub-layer 312 which are stacked. The refractive indices of the first sub-layer 311 and the second sub-layer 312 are different. In this way, the Bragg reflection layer 30 has a relatively high reflectivity for blue light, and the reflectivity of the Bragg reflection layer 30 for blue light is greater than the reflectivity of metal for blue light. Through experiments, the reflectivity of the Bragg reflection layer 30 for blue light is greater than 92%.

[0065] Set in this way, the anode 2021 of the blue light emitting device 221 is a transparent electrode, and blue light passes through the anode 2021 of the blue light emitting device 221 and hits the Bragg reflection layer 30. The reflectivity of the Bragg reflection layer 30 for blue light is greater than the reflectivity of metal for blue light. Compared with the metal reflection electrode in the related art, the Bragg reflection layer 30 provided in some embodiments of the present disclosure reflects more blue light, which is beneficial to increasing the light extraction amount of blue light. The current flowing through the blue light emitting device 221 can be reduced, the power consumption of the blue light emitting device 221 can be reduced, the power consumption of the display panel 100 can be reduced, and the power consumption of the display device can be reduced.

[0066] It can be understood that in the resonant cavity, when there are many reflected light rays, in order to meet the light extraction requirements of the light emitting device 202, the light extraction point of the resonant cavity is designed at the first node (where the light intensity is the largest), and the light emitting functional part 2022 of the light emitting device 202 is thinner. When there are fewer reflected light rays, in order to meet the light extraction requirements of the light emitting device 202, the light extraction point of the resonant cavity is designed at the second node (the light intensity of the second node is less than that of the first node), and the light emitting functional part 2022 of the light emitting device 202 is thicker.

[0067] On this basis, since the Bragg reflection layer 30 reflects more blue light, in order to meet the light extraction requirements of the blue light emitting device 221, the light extraction point of the resonant cavity of the blue light emitting device 221 is designed at the first node, and the light emitting functional part 2022 of the blue light emitting device 221 is thinner. On the one hand, the thinner light emitting functional part 2022 of the blue light emitting device 221 is beneficial to reducing the cost of the display panel 100. On the other hand, the thinner light emitting functional part 2022 of the blue light emitting device 221 absorbs less blue light, thereby increasing the light extraction amount of blue light. The thinner light emitting functional part 2022 of the blue light emitting device 221 absorbs less blue light, thereby increasing the light extraction amount of blue light, which is beneficial to reducing the current flowing through the blue light emitting device 221, reducing the power consumption of the blue light emitting device 221, reducing the power consumption of the display panel 100, and reducing the power consumption of the display device.

[0068] Exemplarily, as Figure 4 shown, the Bragg reflection layer 30 includes five stacked Bragg reflection sub-layers 31. At this time, the reflectivity of the Bragg reflection layer 30 for blue light is 100%.

[0069] Exemplarily, the material of the first electrode 2211 includes ITO.

[0070] In some embodiments, as Figure 4 shown, the refractive index of the first sub-layer 311 is less than that of the second sub-layer 312.

[0071] Set in this way, when blue light enters the second sub-layer 312 from the first sub-layer 311, the blue light will be reflected on the surface of the second sub-layer 312 close to the first sub-layer 311 and the surface of the second sub-layer 312 far from the first sub-layer 311 respectively. When the blue light is reflected on the surface of the second sub-layer 312 close to the first sub-layer 311, a half-wave loss will occur, that is, the phase of the blue light reflected on the surface of the second sub-layer 312 close to the first sub-layer 311 changes by π. The half-wave loss makes the phase difference between the blue light reflected on the surface of the second sub-layer 312 close to the first sub-layer 311 and the blue light reflected on the surface of the second sub-layer 312 far from the first sub-layer 311 be π. When the thickness of the second sub-layer 312 is one-fourth of the wavelength of the blue light in the second sub-layer 312, the phase difference corresponding to the optical path difference between the blue light reflected on the surface of the second sub-layer 312 close to the first sub-layer 311 and the blue light reflected on the surface of the second sub-layer 312 far from the first sub-layer 311 is π. Therefore, the combined action of the phase difference corresponding to the optical path difference being π and the phase difference corresponding to the half-wave loss being π can make the phase difference between the blue light reflected on the surface of the second sub-layer 312 close to the first sub-layer 311 and the blue light reflected on the surface of the second sub-layer 312 far from the first sub-layer 311 be 0. The blue light reflected on the surface of the second sub-layer 312 close to the first sub-layer 311 and the blue light reflected on the surface of the second sub-layer 312 far from the first sub-layer 311 undergo constructive interference, that is, the blue light reflected on the surface of the second sub-layer 312 close to the first sub-layer 311 and the blue light reflected on the surface of the second sub-layer 312 far from the first sub-layer 311 are superimposed on each other, and the light intensity of the superimposed reflected blue light increases, so that the reflectivity of the Bragg reflection layer 30 for blue light can be relatively high.

[0072] In some examples, the refractive index of the first sub-layer 311 is 1.1 to 1.7.

[0073] For example, the refractive index of the first sub-layer 311 is 1.1, 1.2, 1.3, 1.35, 1.38, 1.4, 1.46, 1.5, 1.6, 1.63 or 1.7.

[0074] In some examples, the material of the first sub-layer 311 is magnesium fluoride (MgF2 ), silicon dioxide (SiO 2 ), aluminum fluoride (AlF 3 ), or aluminum oxide (Al 2 O 3 ).

[0075] In some examples, the refractive index of the second sub-layer 312 is 1.7 to 2.4.

[0076] For example, the refractive index of the first sub-layer 311 is 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.35, or 2.4.

[0077] In some examples, the material of the second sub-layer 311 is zinc sulfide (ZnS), niobium pentoxide (Nb 2 O 5 ), tantalum pentoxide (Ta 2 O 5 ), titanium dioxide (TiO 2 ), silicon nitride (SiN).

[0078] In some embodiments, as Figure 3 shown, the display panel 100 further includes a pixel defining layer 40. The pixel defining layer 40 is located between the Bragg reflection layer 30 and the substrate 10. The pixel defining layer 40 has a first opening 41, and the first electrode 2211 is located within the first opening 41. Among them, the Bragg reflection layer 30 covers the bottom wall and the side wall of the first opening 41. That is, the orthographic projection of the Bragg reflection layer 30 on the substrate 10 covers the orthographic projection of the first opening 41 on the substrate 10, and the Bragg reflection layer 30 covers the side wall of the first opening 41.

[0079] Set in this way, the blue light obliquely incident on the side wall of the first opening 41 by the light-emitting functional part 2022 is reflected by the Bragg reflection layer 30, and at least part of the light is perpendicular to the substrate 1010, so that the forward light output of the blue light can be increased, which is beneficial to improving the forward brightness of the blue light, the current flowing through the blue light-emitting device 221 can be further reduced, the power consumption of the blue light-emitting device 221 can be reduced, and the power consumption of the display panel 100 can be reduced.

[0080] In some embodiments, as Figure 3 shown, the included angle θ formed by the surface of the Bragg reflection layer 30 away from the side wall of the first opening 41 and the substrate 10 is 30° to 80°.

[0081] For example, the included angle formed by the surface of the Bragg reflection layer 30 away from the side wall of the first opening 41 and the substrate 10 is 30°, 35°, 38°, 40°, 47°, 50°, 52°, 65°, 70°, 74°, 78°, or 80°.

[0082] In some embodiments, such as Figure 3 shown, the display panel 100 further includes spacers 50. The spacers 50 are located on the side of the pixel defining layer 40 away from the substrate 10. The orthographic projection of the spacers 50 on the substrate 10 is offset (non-overlapping) from the orthographic projection of the first opening 41 on the substrate 10, that is, the orthographic projection of the spacers 50 on the substrate 10 is located within the orthographic projection of the pixel defining layer 40 on the substrate 10. Among them, the spacers 50 and the Bragg reflection layer 30 are made of the same material and are disposed in the same layer.

[0083] With this arrangement, the spacers 50 and the Bragg reflection layer 30 can be formed by a single patterning process, which can reduce the number of mask plates and thus reduce the manufacturing cost of the display panel 100.

[0084] In some embodiments, the thickness of the Bragg reflection layer 30 is greater than or equal to 1 μm. That is, the thickness of the spacers 50 is greater than or equal to 1 μm.

[0085] With this arrangement, during the process of forming the light-emitting functional portion 2022 with the evaporation material, the distance between the mask plate and the pixel defining layer 40 will not be too small, which can reduce the risk of the mask plate being scratched.

[0086] Exemplarily, the thickness of the Bragg reflection layer 30 is 1 μm, 1.4 μm, 1.8 μm, 2 μm, 2.2 μm, 2.5 μm, 2.7 μm, 3 μm, 3.5 μm, 4 μm or 5 μm.

[0087] In some other embodiments, the thickness of the Bragg reflection layer 30 is less than or equal to 2 μm. That is, the thickness of the spacers 50 is less than or equal to 2 μm.

[0088] With this arrangement, during the process of forming the light-emitting functional portion 2022 with the evaporation material, the distance between the mask plate and the pixel defining layer 40 will not be too large, which can reduce the risk of the evaporation material overflowing and generating shadows.

[0089] Exemplarily, the thickness of the Bragg reflection layer 30 is 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1.0 μm, 1.1 μm, 1.2 μm, 1.5 μm, 1.8 μm or 2 μm.

[0090] In some embodiments, such as Figure 3 and Figure 5As shown, the red light-emitting device 211 includes a third electrode 2111 and a fourth electrode 2112. In the direction from the substrate 10 to the red light-emitting device 211, the third electrode 2111 includes a first sub-electrode 1, a second sub-electrode 2, and a first sub-electrode 1 stacked. The material of the first sub-electrode 1 is the same as that of the first electrode 2211, and the second sub-electrode 2 is a reflective electrode. The fourth electrode 2112 is located on the side of the third electrode 2111 away from the substrate 10 and is disposed opposite to the third electrode 2111. The fourth electrode 2112 is a semi-transmissive and semi-reflective electrode. The above-mentioned third electrode 2111 is the anode 2021 of the red light-emitting device 211, and the second electrode 2212 is the cathode 2023 of the red light-emitting device 211. Among them, the reflective electrode refers to an electrode with a reflectivity greater than 90%.

[0091] Set in this way, the anode 2021 of the red light-emitting device 211 includes a first sub-electrode 1, a second sub-electrode 2, and a first sub-electrode 1 stacked, that is, the anode 2021 of the red light-emitting device 211 is thicker, the resistance of the anode 2021 of the red light-emitting device 211 is smaller, the voltage drop on the anode 2021 of the red light-emitting device 211 is smaller, the power consumption of the red light-emitting device 211 can be reduced, which is beneficial to reducing the power consumption of the display panel 100.

[0092] In some examples, the material of the reflective electrode includes a metal. For example, the material of the reflective electrode includes at least one of silver (abbreviation: Ag), gold (abbreviation: Au), palladium (abbreviation: Pd), platinum (abbreviation: Pt), aluminum (abbreviation: Al), magnesium (abbreviation: Mg), lithium (abbreviation: Li), calcium (abbreviation: Ca), and ytterbium (abbreviation: Yb).

[0093] In some examples, the thickness of the first sub-electrode 1 is 10 nm to 20 nm.

[0094] For example, the thickness of the first sub-electrode 1 is 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm, or 20 nm.

[0095] In some examples, the thickness of the second sub-electrode 2 is 90 nm to 120 nm.

[0096] For example, the thickness of the second sub-electrode 2 is 90 nm, 92 nm, 95 nm, 98 nm, 100 nm, 105 nm, 106 nm, 110 nm, 111 nm, 113 nm, 114 nm, 115 nm, 117 nm, 118 nm, or 120 nm.

[0097] On this basis, the thickness of the first electrode 2211 is greater than the thickness of the first sub-electrode 1.

[0098] Set in this way, the anode 2021 of the blue light-emitting device 221 is thicker, the resistance of the anode 2021 of the blue light-emitting device 221 is smaller, the voltage drop across the anode 2021 of the blue light-emitting device 221 is smaller, the power consumption of the blue light-emitting device 221 can be reduced, which is beneficial to reducing the power consumption of the display panel 100.

[0099] In some examples, the thickness of the first electrode 2211 is 20 nm to 40 nm.

[0100] For example, the thickness of the first electrode 2211 is 20 nm, 21 nm, 23 nm, 24 nm, 25 nm, 27 nm, 28 nm, 30 nm, 32 nm, 33 nm, 35 nm, 37 nm, 38 nm, 39 nm or 40 nm.

[0101] In addition, as Figure 3 shown, the pixel defining layer 40 further includes a second opening 42. The orthographic projection of the second opening 42 on the substrate 10 overlaps with the orthographic projection of the third electrode 2111 on the substrate 10. And the light-emitting functional part 2022 of the red light-emitting device 211 is located within the second opening 42.

[0102] In some embodiments, as Figure 3 and Figure 5 shown, the green light-emitting device 231 includes a fifth electrode 2311 and a sixth electrode 2312. In the direction from the substrate 10 to the green light-emitting device 231, the fifth electrode 2311 includes a third sub-electrode 3, a fourth sub-electrode 4 and a third sub-electrode 3 which are stacked. The material of the third sub-electrode 3 is the same as that of the first electrode 2211, and the fourth sub-electrode 4 is a reflective electrode. The sixth electrode 2312 is located on the side of the fifth electrode 2311 away from the substrate 10 and is opposite to the fifth electrode 2311. The sixth electrode 2312 is a semi-transmissive and semi-reflective electrode. The above-mentioned fifth electrode 2311 is the anode 2021 of the green light-emitting device 231, and the fifth electrode 2311 is the cathode 2023 of the green light-emitting device 231.

[0103] Set in this way, the anode 2021 of the green light-emitting device 231 includes a third sub-electrode 3, a fourth sub-electrode 4 and a third sub-electrode 3 which are stacked, that is, the anode 2021 of the green light-emitting device 231 is thicker, the resistance of the anode 2021 of the green light-emitting device 231 is smaller, the voltage drop across the anode 2021 of the green light-emitting device 231 is smaller, the power consumption of the green light-emitting device 231 can be reduced, which is beneficial to reducing the power consumption of the display panel 100.

[0104] In some examples, the thickness of the third sub-electrode 3 is 10 nm to 20 nm.

[0105] For example, the thickness of the third sub-pole 3 is 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm, or 20 nm.

[0106] In some examples, the thickness of the fourth sub-pole 4 is 90 nm to 120 nm.

[0107] For example, the thickness of the fourth sub-pole 4 is 90 nm, 92 nm, 95 nm, 98 nm, 100 nm, 105 nm, 106 nm, 110 nm, 111 nm, 113 nm, 114 nm, 115 nm, 117 nm, 118 nm, or 120 nm.

[0108] In addition, as Figure 3 shown, the pixel defining layer 40 further includes a third opening 43, and the orthographic projection of the third opening 43 on the substrate 10 overlaps with the orthographic projection of the fifth electrode 2311 on the substrate 10. And the light-emitting functional part 2022 of the green light-emitting device 231 is located within the third opening 43.

[0109] In some embodiments, as Figure 3 shown, the sidewall of the spacer 50 is coplanar with the sidewall of the second opening 42 or the sidewall of the third opening 43.

[0110] Arranged in this way, the spacer 50 does not block the light emission of the light-emitting device 202.

[0111] In some embodiments, as Figure 3 shown, the pixel circuit 201 includes a plurality of transistors 2011 and storage capacitors.

[0112] The transistors employed in the circuits provided by the embodiments of the present disclosure may be thin-film transistors, field-effect transistors, or other switching devices with the same characteristics. In the embodiments of the present disclosure, thin-film transistors are taken as an example for illustration.

[0113] Exemplarily, the transistor 2011 is, for example, an oxide thin-film transistor. The oxide thin-film transistor has a high carrier mobility, which can improve the response speed of the transistor 2011.

[0114] In some embodiments, as Figure 3 shown, the display panel 100 further includes a red color filter portion 50, a blue color filter portion 60, and a green color filter portion 70. In the orthographic projection onto the substrate 10, the red color filter portion 50 overlaps with the red light-emitting device 211, the blue color filter portion 60 overlaps with the blue light-emitting device 221, and the green color filter portion 70 overlaps with the green light-emitting device 231.

[0115] Some embodiments of the present disclosure also provide a method for manufacturing the display panel 100, for manufacturing the display panel 100 of any of the above embodiments. AsFigure 6 As shown, the preparation method S1000 includes S100 to S200.

[0116] S100. Form a Bragg reflection layer 30 on the substrate 10.

[0117] In the above steps, the Bragg reflection layer 30 includes at least one group of Bragg reflection sub-layers 31. Along the direction from the Bragg reflection layer 30 to the substrate 10, one group of Bragg reflection sub-layers 31 includes a first sub-layer 311 and a second sub-layer 312 which are stacked. The refractive indices of the first sub-layer 311 and the second sub-layer 312 are different. The reflectivity of the Bragg reflection layer 30 for blue light is greater than the reflectivity of the metal for blue light. The Bragg reflection layer 30 can be formed by an electron beam evaporation process or a magnetron sputtering process.

[0118] In some examples, the refractive index of the first sub-layer 311 is 1.1 to 1.7.

[0119] For example, the refractive index of the first sub-layer 311 is 1.1, 1.2, 1.3, 1.35, 1.38, 1.4, 1.46, 1.5, 1.6, 1.63 or 1.7.

[0120] In some examples, the material of the first sub-layer 311 is magnesium fluoride (MgF 2 ), silicon dioxide (SiO 2 ), aluminum fluoride (AlF 3 ), or aluminum oxide (Al 2 O 3 ).

[0121] In some examples, the refractive index of the second sub-layer 312 is 1.7 to 2.4.

[0122] For example, the refractive index of the first sub-layer 311 is 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.35 or 2.4.

[0123] In some examples, the material of the second sub-layer 311 is zinc sulfide (ZnS), niobium pentoxide (Nb 2 O 5 ), tantalum pentoxide (Ta 2 O 5 ), titanium dioxide (TiO 2 ), silicon nitride (SiN).

[0124] S200. Form a blue light emitting device 221 on the side of the Bragg reflection layer 30 away from the substrate 10.

[0125] In the above steps, the blue light-emitting device 221 includes a first electrode 2211 and a second electrode 2212. The first electrode 2211 is a transparent electrode and is in contact with the Bragg reflection layer 30. The second electrode 2212 is located between the first electrode 2211 and the substrate 10 and is disposed opposite to the first electrode 2211. The second electrode 2212 is a semi-transmissive and semi-reflective electrode.

[0126] Exemplarily, the material of the first electrode 2211 includes ITO, and the material of the semi-transmissive and semi-reflective electrode includes indium zinc oxide (English: Indium Zinc Oxide, abbreviation: IZO) or zinc oxide (ZnO).

[0127] In some embodiments, as Figure 6 shown, before S100, the preparation method further includes S101.

[0128] S101. Form a pixel defining layer 40.

[0129] In the above steps, the pixel defining layer 40 is located between the Bragg reflection layer 30 and the substrate 10. The pixel defining layer 40 has a first opening 41, and the first electrode 2211 is located within the first opening 41. The Bragg reflection layer 30 covers the bottom wall and side walls of the first opening 41.

[0130] In some examples, the angle formed between the surface of the Bragg reflection layer 30 away from the side wall of the first opening 41 and the substrate 10 is 30° to 80°.

[0131] For example, the angle formed between the surface of the Bragg reflection layer 30 away from the side wall of the first opening 41 and the substrate 10 is 30°, 35°, 38°, 40°, 47°, 50°, 52°, 65°, 70°, 74°, 78° or 80°.

[0132] In some embodiments, during the process of forming the Bragg reflection layer 30 on the substrate 10, spacers 50 are also formed.

[0133] In the above steps, the spacers 50 are located on the side of the pixel defining layer 40 away from the substrate 10. The orthographic projection of the spacers 50 on the substrate 10 is staggeredly arranged with the orthographic projection of the first opening 41 on the substrate 10.

[0134] With this arrangement, the spacers 50 and the Bragg reflection layer 30 can be formed by a single patterning process, which can reduce the number of mask plates and thus reduce the manufacturing cost of the display panel 100.

[0135] In some embodiments, as Figure 7As shown, some embodiments of the present disclosure also provide another manufacturing method for the display panel 100, which is used to manufacture the display panel 100 in any of the above embodiments. As shown in the figure, the manufacturing method S2000 includes S1100 to S1600.

[0136] S1100. Form a first anode layer on the substrate 10.

[0137] In the above steps, the first anode layer includes a third electrode 2111 and a fifth electrode 2311. The first anode layer can be formed by at least one of a thin film deposition process, an electroplating process, and a chemical plating process.

[0138] S1200. Form a pixel defining layer 40 on the side of the first anode layer away from the substrate 10.

[0139] In the above steps, the pixel defining layer 40 has a first opening 41, a second opening 42, and a third opening 43. In the positive projection onto the substrate 10, the first opening 41 is offset from the third electrode 2111 and the fifth electrode 2311. In the positive projection onto the substrate 10, the second opening 42 is offset from the fifth electrode 2311 and overlaps with the third electrode 2111. In the positive projection onto the substrate 10, the third opening 43 is offset from the third electrode 2111 and overlaps with the fifth electrode 2311. The pixel defining layer 40 can be formed by at least one of a thin film deposition process, an electroplating process, and a chemical plating process.

[0140] S1300. Form a first reflective layer on the side of the pixel defining layer 40 away from the substrate 10.

[0141] In the above steps, the first reflective layer includes a Bragg reflective layer 30 and spacers 50. The Bragg reflective layer 30 is located within the first opening, and the Bragg reflective layer 30 covers the bottom wall and side walls of the first opening 41. In the positive projection onto the substrate 10, the Bragg reflective layer 30 is offset from the second opening 42 and the third opening 43. In the positive projection onto the substrate 10, the spacers 50 are offset from the first opening 41, the second opening 42, and the third opening 43, that is, the spacers 50 are located between the first opening 41 and the second opening 42, between the second opening 42 and the third opening 43, and between the third opening 43 and the first opening 41. The first reflective layer can be formed by an electron beam evaporation process or a magnetron sputtering process.

[0142] S1400. Form a second anode layer on the side of the first reflective layer away from the substrate 10.

[0143] In the above steps, the second anode layer includes the first electrode 2211. In the orthographic projection onto the substrate 10, the first electrode 2211 is staggered from the second opening 42 and the third opening 43, the first electrode 2211 is located within the first opening 41, and is in contact with the Bragg reflection layer 30. The second anode layer can be formed by at least one of a thin film deposition process, an electroplating process, and a chemical plating process.

[0144] S1500. Form a light-emitting functional layer on the side of the second anode layer away from the substrate 10.

[0145] In the above steps, the light-emitting functional layer includes the light-emitting functional parts of the red light-emitting device 211, the blue light-emitting device 221, and the green light-emitting device 231. The pixel defining layer 40 can be formed by an evaporation process or an inkjet printing process.

[0146] S1600. Form a cathode layer on the side of the light-emitting functional layer away from the substrate 10.

[0147] In the above steps, the cathode layer includes the second electrode 2212, the fourth electrode 2112, and the sixth electrode 2312. The cathode layer can be formed by at least one of a thin film deposition process, an electroplating process, and a chemical plating process.

[0148] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0149] As described above, the above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure, thinking of changes or substitutions, should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: substrate; A blue light emitting device is located on one side of the substrate; The blue light emitting device comprises: A first electrode, wherein the first electrode is a transparent electrode; a second electrode, located at a side of the first electrode away from the substrate and arranged opposite to the first electrode; the second electrode is a semi-transmissive and semi-reflective electrode; A Bragg reflection layer is located between the first electrode and the substrate and contacts the first electrode; the Bragg reflection layer includes at least one group of Bragg reflection sublayers, and the group of Bragg reflection sublayers includes a first sublayer and a second sublayer stacked in a direction along the Bragg reflection layer pointing to the substrate; the first sublayer and the second sublayer have different refractive indices, and the reflectivity of the Bragg reflection layer to blue light is greater than the reflectivity of the metal to blue light.

2. The display panel according to claim 1, characterized in that: Also includes: A pixel defining layer, located between the Bragg reflection layer and the substrate, the pixel defining layer having a first opening, and the first electrode being located in the first opening; Wherein, the Bragg reflection layer covers the bottom wall and side walls of the first opening.

3. The display panel according to claim 2, characterized in that: The angle formed between the surface of the Bragg reflection layer away from the side wall of the first opening and the substrate is 30° to 80°.

4. The display panel according to claim 2, characterized in that: Also includes: A spacer, located on a side of the pixel defining layer away from the substrate; The orthographic projection of the spacer on the substrate is staggered with the orthographic projection of the first opening on the substrate; The spacer and the Bragg reflection layer are made of the same material and are arranged in the same layer.

5. The display panel according to claim 4, characterized in that: The thickness of the Bragg reflection layer is 1 μm to 2 μm.

6. The display panel according to claim 1, characterized in that: The refractive index of the first sub-layer is smaller than the refractive index of the second sub-layer.

7. The display panel according to claim 1, characterized in that: The refractive index of the first sub-layer is 1.1 to 1.7; and / or the refractive index of the second sub-layer is 1.7 to 2.

4.

8. The display panel according to any one of claims 1 to 7, characterized in that: Also includes: A red light emitting device is located on a side of the substrate close to the blue light emitting device; the red light emitting device comprises: A third electrode is directed from the substrate to the direction of the red light-emitting device, wherein the third electrode comprises a first sub-pole, a second sub-pole and a first sub-pole which are stacked; the material of the first sub-pole is the same as that of the first electrode, and the thickness of the first electrode is greater than that of the first sub-pole; the second sub-pole is a reflective electrode; The fourth electrode is located on a side of the third electrode away from the substrate, and is arranged opposite to the third electrode; the fourth electrode is a semi-transmissive and semi-reflective electrode.

9. The display panel according to claim 8, characterized in that: The thickness of the first sub-pole is 10 nm to 20 nm, and / or the thickness of the first electrode is 20 nm to 40 nm.

10. A display device, characterized in that: include: The display panel according to any one of claims 1 to 9.

11. A method for preparing a display panel, for preparing the display panel according to any one of claims 1 to 9, characterized in that: include: A Bragg reflection layer is formed on a substrate; the Bragg reflection layer comprises at least one group of Bragg reflection sublayers, and the group of Bragg reflection sublayers comprises a first sublayer and a second sublayer stacked in a direction along the Bragg reflection layer pointing to the substrate; the first sublayer and the second sublayer have different refractive indices; A blue light-emitting device is formed on a side of the Bragg reflection layer away from the substrate; the blue light-emitting device includes a first electrode and a second electrode, the first electrode is a transparent electrode and is in contact with the Bragg reflection layer; the second electrode is located between the first electrode and the substrate and is arranged opposite to the first electrode; the second electrode is a semi-transmissive and semi-reflective electrode.

12. The preparation method according to claim 11, characterized in that: Before forming a Bragg reflection layer on the substrate, the preparation method further comprises: A pixel defining layer is formed; the pixel defining layer is located between the Bragg reflection layer and the substrate, the pixel defining layer has a first opening, and the first electrode is located in the first opening; the orthographic projection of the Bragg reflection layer on the substrate covers the orthographic projection of the first opening on the substrate, and the Bragg reflection layer covers the side wall of the first opening.

13. The preparation method according to claim 12, characterized in that: In the process of forming the Bragg reflection layer on the substrate, a spacer is also formed; the spacer is located on the side of the pixel definition layer away from the substrate; the orthographic projection of the spacer on the substrate overlaps with the orthographic projection of the pixel definition layer on the substrate.

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