Display panel and display device

Abstract

The invention provides a display panel and a display device. The display panel comprises a substrate, a light-emitting layer, a packaging layer and a color film layer, the light-emitting layer is arranged on one side of the substrate, and in the direction away from the substrate, the light-emitting layer comprises a first electrode, a white organic light-emitting diode light-emitting unit and a second electrode which are sequentially arranged in a stacked mode. The packaging layer is located on the side, away from the substrate, of the second electrode, and the packaging layer comprises multiple layers of packaging films; the color film layer is located on the side, away from the substrate, of the packaging layer and comprises a four-color light filtering unit. Under the condition of high pixel density, the color gamut is effectively improved, and the display visual brightness effect is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of packaging, and in particular, to a display panel and a display device. BACKGROUND

[0002] Organic light emitting diodes (OLED) and flat display devices based on light emitting diode (LED) technology have been widely used in mobile phones, televisions, notebook computers, desktop computers and other consumer electronic products due to their high image quality, power saving, thin body and wide application range. It has become the mainstream of display devices. High brightness and wide color gamut are the goals of current display technologies.

[0003] Among them, VR / AR OLED requires display technology with ultra-high pixel density and ultra-high brightness. With the increase of pixel density, optical / electrical crosstalk becomes particularly serious, which seriously affects the clarity of display quality, so it is necessary to thin the thin film packaging layer. However, the ultra-thin thin film packaging layer has adverse optical interference on the emission spectrum of three-color WOLED (White Organic Light Emitting Diode), which causes the spectral purity of RGB three colors to decrease, resulting in the problem of reduced display color gamut.

[0004] Therefore, there is an urgent need for a new technical solution. SUMMARY

[0005] Therefore, the purpose of the present disclosure is to provide a display panel and a display device to solve the problems of optical crosstalk and low color gamut caused by the thin film packaging structure under high pixel density.

[0006] To achieve the above purpose, the present disclosure provides a display panel, comprising:

[0007] a substrate;

[0008] a light emitting layer, the light emitting layer is arranged on one side of the substrate, and in a direction away from the substrate, the light emitting layer comprises a first electrode, a white organic light emitting diode light emitting unit and a second electrode which are sequentially stacked;

[0009] a packaging layer, the packaging layer is located on the side of the second electrode away from the substrate, and the packaging layer comprises a plurality of packaging films;

[0010] a color film layer, the color film layer is located on the side of the packaging layer away from the substrate, and the color film layer comprises four-color filter units.

[0011] Further, the overall thickness of the packaging layer is less than or equal to 1.5 μm.

[0012] Preferably, the thickness of the encapsulation film is 400-800 nm.

[0013] Further, the encapsulation layer comprises at least three encapsulation films;

[0014] The refractive index of the encapsulation film is 1.2-2.0.

[0015] Further, the material of the encapsulation film comprises at least one of oxide, nitride or oxynitride.

[0016] Further, the white organic light emitting diode light emitting unit comprises a blue light emitting layer, a green light emitting layer and a red light emitting layer.

[0017] Further, the encapsulation layer is used to output a four-color narrow peak spectrum by adjusting the thickness and refractive index of the encapsulation film; wherein the four-color narrow peak spectrum comprises red light, green light, blue light and cyan light.

[0018] The color film layer is used to filter the four-color narrow peak spectrum to output target color light; wherein the four-color filter unit comprises a red filter unit, a green filter unit, a blue filter unit and a cyan filter unit corresponding to the four-color narrow peak spectrum.

[0019] Further, a light extraction layer is arranged between the second electrode and the encapsulation layer.

[0020] A light extraction layer is arranged on the side of the color film layer away from the substrate.

[0021] Further, the encapsulation layer comprises four encapsulation films arranged in layers, in order from the side away from the substrate, a first encapsulation film, a second encapsulation film, a third encapsulation film and a fourth encapsulation film.

[0022] The thickness of the first encapsulation film is 20-60 nm, and the refractive index is 1.2-1.6.

[0023] The thickness of the second encapsulation film is 100-200 nm, and the refractive index is 1.7-2.0.

[0024] The thickness of the third encapsulation film is 300-400 nm, and the refractive index is 1.5-1.7.

[0025] The thickness of the fourth encapsulation film is 30-80 nm, and the refractive index is 1.6-1.8.

[0026] Further, the side of the encapsulation layer away from the substrate is a light emitting surface.

[0027] The distance L1 between the side of the second electrode facing away from the substrate and the light exit surface is 800-1200 nm;

[0028] The distance L2 between the side of the blue light emitting layer facing away from the substrate and the light exit surface is 900-1300 nm;

[0029] The distance L3 between the side of the green light emitting layer facing away from the substrate and the light exit surface is 1400-1800 nm;

[0030] The distance L4 between the side of the first electrode facing away from the substrate and the light exit surface is 3000-4000 nm.

[0031] Based on the same inventive concept, the present application also discloses a display device comprising the display panel as described above.

[0032] Compared with the prior art, the present application has the following technical effects:

[0033] The present application combines the ultra-thin encapsulation layer with the white organic light emitting diode light emitting unit to form a microcavity structure, and accurately designs the thickness and refractive index of the encapsulation layer and the distance between the light emitting layer of each color in the white organic light emitting diode light emitting unit and the light exit surface of the encapsulation layer, realizes the conversion of the three-color light spectrum to the four-color narrow peak spectrum, achieves the display effect of the four-color super wide color gamut, solves the adverse effects caused by the blue light red shift, the dispersion of red and green light and the low intensity; at the same time, a color film layer corresponding to the color of the four-color narrow peak spectrum is arranged adjacent to the encapsulation layer, which is used for filtering the four-color narrow peak spectrum, sorting the mixed light into independent color pixel light and intercepting stray light, effectively improving the color gamut and improving the display visual brightness effect. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the present disclosure or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art descriptions. Obviously, the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0035] Figure 1 It is a spectrum diagram of a related display panel;

[0036] Figure 2 It is a structure diagram of the display panel in an embodiment of the present application Figure 1 ;

[0037] Figure 3 It is a structure diagram of the WOLED light emitting unit of the display panel in an embodiment of the present application;

[0038] Figure 4Structure diagram of a display panel in an embodiment of the present application Figure 2

[0039] Figure 5 Structure diagram of an encapsulation layer of a display panel in an embodiment of the present application

[0040] Figure 6 Structure diagram of a micro-cavity of a display panel in an embodiment of the present application

[0041] Figure 7 Wide color gamut spectrum diagram of a display panel in an embodiment of the present application DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to specific embodiments and drawings.

[0043] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood as the common meanings understood by those skilled in the art to which the present disclosure belongs. The terms "first", "second" and similar terms used in the embodiments of the present disclosure do not represent any order, number or importance, but are only used to distinguish different components. The terms "include", "contain" and similar terms mean that the components or objects before the terms encompass the components or objects listed after the terms and their equivalents, and do not exclude other components or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0044] ​Organic light emitting diode (OLED) and flat display devices based on light emitting diode (LED) and other technologies have been widely used in mobile phones, televisions, notebook computers, desktop computers and other consumer electronic products due to their high image quality, power saving, thin body and wide application range. High brightness and wide color gamut are the goals of current display technologies. Compared with LED, OLED has significant advantages in color gamut coverage and brightness adjustment, and has been widely used in TVs, monitors, mobile terminals, VR / AR and other display scenarios. Among them, VR / AR OLED requires display technology with ultra-high pixel density and ultra-high brightness. However, with the significant increase in pixel density, optical / electrical crosstalk becomes particularly serious, which seriously affects the clarity of display quality. Therefore, it is necessary to thin the thin film encapsulation layer of the WOLED device. Thinning the thin film encapsulation layer can effectively reduce the signal interference between pixels.

[0045] However, the ultra-thin thin film encapsulation layer has adverse optical interference on the outcoupling spectrum of the three-color WOLED, resulting in a decrease in the spectral purity of RGB three colors and a decrease in the display color gamut. As shown in the spectrum of a related display panel, it can be seen that there are problems of blue light red shift, many discrete peaks and low color gamut in the spectrum. Figure 1 As shown in the spectrum of a related display panel, it can be seen that there are problems of blue light red shift, many discrete peaks and low color gamut in the spectrum.

[0046] In related technologies, various schemes can be adopted to achieve ultra-wide color gamut of WOLED. First, an RGBC four-pixel structure is formed by increasing the cyan sub-pixel. Second, a quantum dot color conversion layer (QQDC) with ultra-narrow half-peak width is added to achieve color gamut expansion. Third, a microcavity of transparent anode indium tin oxide (ITO) is used to enhance and control the wide color gamut.

[0047] The inventors of the present application found the following problems in related technologies during long-term practical work:

[0048] Increasing the cyan sub-pixel requires the use of a new cyan light-emitting layer material, which has not yet been commercialized, and the material cost is high. At the same time, a fine metal mask (FMM) needs to be added to prepare the cyan light-emitting layer, and the process is complex. The color conversion efficiency of the existing QDCC material is low, which cannot meet the VR / AR display requirements. In the pixelization process of the ITO microcavity regulation unit, the deposited bottom layer ITO is easily affected by the induced crystallization, resulting in unstable film layer structure. Moreover, the interface of ITO thin film deposited in different batches is different, which affects the electrical performance consistency of the device and reduces the product yield.

[0049] Based on the above reasons, the display panel provided by the present application includes a substrate, a light-emitting layer, an encapsulation layer, and a color film layer. The light-emitting layer is arranged on one side of the substrate and includes a first electrode, a white organic light-emitting diode light-emitting unit, and a second electrode arranged in layers. The encapsulation layer is located on the side of the second electrode away from the substrate and includes multiple encapsulation films. The thickness and refractive index of the encapsulation films are adjusted to output a four-color narrow-peak spectrum. The color film layer is located on the side of the encapsulation layer away from the substrate and includes a four-color filter unit. The four-color filter unit filters the four-color narrow-peak spectrum to output a target color light.

[0050] The ultra-thin encapsulation layer is combined with the white organic light-emitting diode light-emitting unit to form a microcavity structure. The thickness and refractive index of the encapsulation layer and the distance between the light-emitting layer of each color in the white organic light-emitting diode light-emitting unit and the light-emitting surface of the encapsulation layer are precisely designed. This realizes the conversion of the three-color light spectrum to a four-color narrow-peak spectrum, achieves a four-color ultra-wide color gamut display effect, and solves the adverse effects caused by blue light red shift, red and green light dispersion, and low intensity. At the same time, a color film layer corresponding to the color of the four-color narrow-peak spectrum is arranged adjacent to the encapsulation layer. The color film layer filters the four-color narrow-peak spectrum, sorts the mixed light into independent color pixel light, and intercepts stray light. This effectively improves the color gamut and improves the display visual brightness effect.

[0051] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0052] Specifically, Figure 1 is a spectrum diagram of a related display panel; Figure 2 is a structure schematic diagram of a display panel in an embodiment of the present application Figure 1 ; Figure 3 is a structure schematic diagram of a WOLED light-emitting unit of a display panel in an embodiment of the present application; Figure 4 is a structure schematic diagram of a display panel in an embodiment of the present applicationFigure 2 ; Figure 5 This is a schematic diagram of the encapsulation layer structure of the display panel in one embodiment of this application; Figure 6 This is a schematic diagram of the microcavity structure of a display panel in one embodiment of this application; Figure 7 This is a wide color gamut spectrum of the display panel in one embodiment of this application.

[0053] In one embodiment, such as Figure 2 As shown, this application discloses a display panel, including a substrate 100, a light-emitting layer 200, an encapsulation layer 300, and a color filter layer 400. The light-emitting layer 200 is disposed on one side of the substrate 1000. In the direction away from the substrate 100, the light-emitting layer 200 includes a first electrode 210, a white organic light-emitting diode (OLED) light-emitting unit 220, and a second electrode 230 stacked sequentially. The encapsulation layer 300 is located on the side of the second electrode 230 away from the substrate 100. The encapsulation layer 300 includes multiple encapsulation films for outputting a four-color narrow-peak spectrum by adjusting the thickness and refractive index of the light-emitting films. The color filter layer 400 is located on the side of the encapsulation layer 300 away from the substrate 100. The color filter layer 400 includes a four-color filter unit for filtering the four-color narrow-peak spectrum to output a target color light. In this embodiment, the target color light is red, green, blue, and cyan (RGBC), achieving an RGBC ultra-wide color gamut display.

[0054] The substrate 100 is used to support structures such as the display layer and array layer in the display panel. The substrate 100 can be a flexible substrate. The flexible substrate 100 can be formed from polymer materials such as polyimide (PI), polycarbonate (PC), polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyaryl compounds (PAR), or glass fiber reinforced plastic (FRP). The flexible substrate 100 can be transparent, translucent, or opaque. The substrate 100 can also be a rigid substrate. A glass substrate 100 is preferred as a rigid substrate.

[0055] In this embodiment, the light-emitting layer 200 is disposed on one side of the substrate 100. The light-emitting layer 200 includes a first electrode 210, a white organic light-emitting diode (OLED) light-emitting unit 220, and a second electrode 230 stacked together. The first electrode 210 is the anode, and the second electrode 230 is the cathode. The anode can be made of inorganic materials or organic conductive polymers. Inorganic materials generally include metal oxides such as ITO, zinc oxide, and zinc tin oxide, or metals with high work functions such as gold, copper, and silver, preferably ITO. The organic conductive polymer is preferably one of polythiophene / sodium polyvinylbenzenesulfonate and polyaniline. The cathode generally uses metals with low work functions such as lithium, magnesium, calcium, strontium, aluminum, and indium, or alloys thereof with copper, gold, or silver.

[0056] The white organic light-emitting diode (WOLED) light-emitting unit 220 includes at least one WOLED. A WOLED is a full-surface light-emitting structure that does not require a precision metal mask and is used to convert electrical energy into white light of the three basic colors of red, green, and blue (RGB) to provide a light source for the display panel.

[0057] The WOLED light-emitting unit includes a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a blue light-emitting layer, a green light-emitting layer, a red light-emitting layer, a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL). In this embodiment, as... Figure 3 As shown, along the direction away from the substrate 100, the WOLED light-emitting unit includes an anode, HIL, HTL, EBL, red light-emitting layer, green light-emitting layer, HBL, ETL, EIL, HIL, HTL, EBL, blue light-emitting layer, HBL, ETL, EIL, and cathode stacked together.

[0058] Specifically, after power is applied, holes are injected into the anode through the HIL and electrons are injected into the cathode through the EIL. These electrons are then transferred to the blue, green, and red light-emitting layers and fully combined to convert into light energy, emitting blue, green, and red light respectively. After mixing, they form white light with a continuous spectrum, which is emitted from the WOLED and enters the subsequent encapsulation layer.

[0059] It should be noted that WOLED is a light-emitting structure with full-surface vapor deposition. The blue, green and red light emitted by WOLED is a mixed spectrum, which cannot directly form the color pixels required for the display panel.

[0060] In some alternative embodiments, since the cathode is typically produced by electron beam-encapsulated vacuum evaporation of cathode material to form a uniformly thick and smooth cathode film, its light refraction is poor. Therefore, a light extraction layer 500 needs to be deposited on the cathode surface to improve light output. For example... Figure 4 As shown, the display panel 100 may also include a light extraction layer 500 (Capping Layer, CPL) disposed on the side of the second electrode 230 away from the substrate 100. The light extraction layer 500 can be used to improve the luminous efficiency of the light-emitting device, thereby improving the luminous display effect of the light-emitting device.

[0061] In some alternative embodiments, such as Figure 4 As shown, the display panel 100 also includes a light extraction layer 600, which is disposed on the side of the color filter layer 400 away from the substrate 100. Microlens array (MLA) technology is generally used, in which multiple microlenses are disposed on the side of the encapsulation layer away from the substrate 100, which effectively improves the light extraction efficiency and luminous brightness of the display panel.

[0062] In this embodiment, as shown in FIG. 3, the encapsulation layer 300 is located on the side of the second electrode 230 away from the substrate 100. The encapsulation layer 300 can encapsulate and protect the display panel 100 as a whole, and can protect the light-emitting layer 200 from water, oxygen and the like. The encapsulation layer 300 can be formed by thin-film encapsulation (TFE). Figure 6

[0063] In this embodiment, as shown in FIG. 3, the encapsulation layer 300 is located on the side of the second electrode 230 away from the substrate 100. The encapsulation layer 300 can encapsulate and protect the display panel 100 as a whole, and can protect the light-emitting layer 200 from water, oxygen and the like. The encapsulation layer 300 can be formed by thin-film encapsulation (TFE). Figure 4 The material of the encapsulation layer 300 includes at least one of an oxide, a nitride or an oxynitride. Alternatively, the encapsulation layer 300 can be a single-layer structure made of inorganic or organic material, or a stacked-layer structure made of at least one of inorganic or organic material.

[0064] In this embodiment, the overall thickness of the encapsulation layer 300 is less than or equal to 1.5 μm. For example, the overall thickness of the encapsulation layer 300 is 1.5 μm, 1.3 μm, 1.1 μm, 0.8 μm or 0.5 μm. In a preferred embodiment, the overall thickness of the encapsulation layer 300 is 400-800 nm. The thickness of the encapsulation layer 300 less than or equal to 1.5 μm can reduce the propagation loss of light in the encapsulation layer 300. If the encapsulation layer 300 is too thick, it will absorb blue light, resulting in a reduced color gamut and luminance. Moreover, if the thickness of the encapsulation layer 300 is greater than 1.5 μm, the optical path will be too long, out of the range of constructive interference of red, green, blue and cyan light, and even the blue light will be red-shifted and the cyan light will disappear.

[0065] Alternatively, the encapsulation layer 300 includes at least three encapsulation films, and each encapsulation film has a refractive index of 1.2-2.0. This refractive index range can cover commonly used encapsulation layer materials. For example, the material of the encapsulation film with low refractive index is SiO2. The material of the encapsulation film with high refractive index is Si3N4 or Al2O3.

[0066] Since the exiting light of the WOLED in the prior art is red-shifted, the red and green light is dispersed and the intensity is reduced after passing through the encapsulation layer 300, it is necessary to change the optical paths of the blue, green and red light. The optical path is determined by the thickness and refractive index of the encapsulation film, so the optical path needs to be changed, i.e., the thickness and refractive index of the encapsulation film need to be adjusted, so as to adjust the originally dispersed red and green light to red, green and cyan light with narrowed half-peak width, thereby effectively improving the display color gamut. Specifically, as shown in FIG. 4, the encapsulation layer 300 is located on the side of the second electrode 230 away from the substrate 100. The encapsulation layer 300 can encapsulate and protect the display panel 100 as a whole, and can protect the light-emitting layer 200 from water, oxygen and the like. The encapsulation layer 300 can be formed by thin-film encapsulation (TFE).

[0067] Figure 5 ​​As shown, the encapsulation layer 300 includes four encapsulation films arranged in a stack, in order from the substrate 100, a first encapsulation film 310, a second encapsulation film 320, a third encapsulation film 330, and a fourth encapsulation film 340; wherein the first encapsulation film 310 has a thickness of 20-60 nm and a refractive index of 1.2-1.6; the second encapsulation film 320 has a thickness of 100-200 nm and a refractive index of 1.7-2.0; the third encapsulation film 330 has a thickness of 300-400 nm and a refractive index of 1.5-1.7; and the fourth encapsulation film 340 has a thickness of 30-80 nm and a refractive index of 1.6-1.8. The refractive indices of adjacent encapsulation films differ significantly, forming a significant refractive index difference, amplifying the interference effect, and accurately screening the red, green, blue, and cyan four-color narrow peak spectrum.

[0068] The present embodiment changes the thickness and refractive index of the encapsulation film to change the optical cavity length, i.e., the distance from the corresponding color light-emitting layer to the light-emitting surface, to achieve microcavity control of different color light, thereby obtaining a four-color narrow peak spectrum. The four-color narrow peak spectrum includes red light, green light, blue light, and cyan light.

[0069] Specifically, as shown in Figure 6 The encapsulation layer 300 and the WOLED light-emitting unit 220 together form a microcavity structure, the side of the encapsulation layer 300 facing away from the substrate 100 is the light-emitting surface, the distance L1 between the side of the second electrode 230 facing away from the substrate 100 and the light-emitting surface of the encapsulation layer is 800-1200 nm; the distance L2 between the side of the blue light-emitting layer facing away from the substrate 100 and the light-emitting surface is 900-1300 nm; the distance L3 between the side of the green light-emitting layer facing away from the substrate 100 and the light-emitting surface is 1400-1800 nm; and the distance L4 between the side of the first electrode 210 facing away from the substrate 100 and the light-emitting surface is 3000-4000 nm. Among them, L1 is used to offset the influence of non-light-emitting layers such as CPL on the optical distance, L2 is used to match the wavelength of blue light, by accurately setting L2, to avoid red shift of blue light, while allowing blue light to form a narrow peak, ensuring the purity of blue light. L3 is used to match the wavelengths of red and green light, and by accurately setting L2, to achieve the narrow peaking of red and green light; and L4 is the interference range of the microcavity structure, to ensure that it covers the wavelength range of the red, green, blue, and cyan four-color light. The color coordinates of the wide peak color light will deviate towards the spectral overlap region, resulting in a reduced color gamut coverage range; after narrow peaking, the spectra of different colors will not overlap, and the color coordinates of the four-color light will accurately fall on the color gamut boundary of the BT.2020 standard, especially the cyan light narrow peak, which can fill the color gamut gap in the blue-green transition area of traditional RGB three colors, to achieve four-color ultra-wide color gamut display, as shown in Figure 7 The spectrum diagram after microcavity control is shown.

[0070] As shown in Figure 2As shown, the color filter layer 400 is located on the side of the encapsulation layer 300 away from the substrate 100, and the color filter layer 400 includes four-color filter units for filtering four-color narrow peak spectra to output target color light. In this embodiment, the four-color filter units include red filter units 410, green filter units 420, blue filter units 430, and cyan filter units 440 corresponding to the four-color narrow peak spectra. Filter units of different colors only allow narrow peak spectra of corresponding wavelengths to pass through, intercept stray light, and improve the purity of the final target color light. Moreover, since the WOLED is a full-surface light-emitting structure, the emitted light is a mixed narrow peak spectrum, and cannot directly form color pixel light, so each filter unit corresponds to a target color light, such as a blue filter unit that only passes blue light and a cyan filter unit that only passes cyan light, and the mixed light is sorted into independent color pixel light, providing a color picture basis for terminal display.

[0071] Compared with the cumbersome operations of multiple evaporation and multiple mask alignment in the preparation steps of a traditional RGB OLED, the preparation of the color filter layer 400 only needs to add one step of photolithography process of four-source color filter after the full-surface deposition, encapsulation, and CPL attachment of the WOLED device, so that color display can be achieved. Specifically, a photosensitive color resist material is coated on the surface of the ultra-thin encapsulation layer 300, and the color resist is patterned by a photolithography process to form red, green, blue, and cyan four-color filter units, without the need to add other complex processes, thereby improving production efficiency.

[0072] In this application, the ultra-thin encapsulation layer is combined with the white organic light-emitting diode light-emitting unit to form a microcavity structure, and the thickness and refractive index of the encapsulation layer and the distance between each color light-emitting layer in the white organic light-emitting diode light-emitting unit and the light-emitting surface of the encapsulation layer are precisely designed, so that the three-color light-emitting spectrum is converted into a four-color narrow peak spectrum, achieving a four-color super-wide color gamut display effect, solving the adverse effects caused by blue light red shift, red and green light dispersion, and low intensity; at the same time, a color filter layer corresponding to the color of the four-color narrow peak spectrum is arranged adjacent to the encapsulation layer, which is used for filtering the four-color narrow peak spectrum, sorting the mixed light into independent color pixel light, and intercepting stray light, effectively improving the color gamut and improving the display visual brightness effect.

[0073] Based on the same inventive concept, the application also discloses a display device including the display panel in the above embodiments.

[0074] It can be understood that the display device in the embodiments of the application can be an OLED display device, electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a wearable device, an Internet of Things device, or any product or component with a display function, and the embodiments disclosed in the application do not limit this.

[0075] The display panel comprises a substrate 100, a light-emitting layer 200, an encapsulation layer 300, and a color film layer 400; the light-emitting layer 200 is arranged on one side of the substrate 100, and in a direction away from the substrate 100, the light-emitting layer 200 comprises a first electrode 210, a white organic light-emitting diode light-emitting unit 220, and a second electrode 230 arranged in sequence; the encapsulation layer 300 is located on a side of the second electrode 230 away from the substrate 100, and the encapsulation layer 300 comprises multiple encapsulation films, which are used to output a four-color narrow-peak spectrum by adjusting the thickness and refractive index of the light-emitting film; the color film layer 400 is located on a side of the encapsulation layer 300 away from the substrate 100, and the color film layer 400 comprises four-color filter units, which are used to filter the four-color narrow-peak spectrum to output target color light. In this embodiment, the target color light is red light, green light, blue light, and cyan light (RGBC), and an RGBC super-wide color gamut display is realized.

[0076] The overall thickness of the encapsulation layer 300 is less than or equal to 1.5 μm, and for example, the overall thickness of the encapsulation layer 300 is 1.5 μm, 1.3 μm, 1.1 μm, 0.8 μm, or 0.5 μm. In a preferred embodiment, the overall thickness of the encapsulation layer 300 is 400-800 nm. The thickness of the encapsulation layer 300 being less than or equal to 1.5 μm can reduce the propagation loss of light in the encapsulation layer 300, and an excessively thick encapsulation layer 300 can absorb blue light, resulting in a reduced color gamut and a reduced brightness.

[0077] The encapsulation layer 300 comprises at least three encapsulation films, and the refractive index of each encapsulation film is 1.2-2.0. This refractive index range can cover commonly used encapsulation layer materials. For example, the material of the encapsulation film with a low refractive index is SiO2, and the material of the encapsulation film with a high refractive index is Si3N4 or Al2O3.

[0078] Since the exiting light of the WOLED in the prior art has the problems of blue light red shift, discrete red and green light, and reduced intensity after passing through the encapsulation layer 300, the optical paths of blue light, green light, and red light need to be changed. The optical path is determined by the thickness and refractive index of the encapsulation film, and therefore the optical path needs to be changed, that is, the thickness and refractive index of the encapsulation film are adjusted, the originally discrete red and green light is regulated to a red-green-cyan three-color light-emitting peak with a narrowed half-peak width, and the display color gamut is effectively improved. Specifically, as shown in FIG. 2, the encapsulation layer 300 is located on a side of the second electrode 230 away from the substrate 100, and the encapsulation layer 300 comprises multiple encapsulation films, which are used to output a four-color narrow-peak spectrum by adjusting the thickness and refractive index of the light-emitting film. Figure 5As shown, the encapsulation layer 300 includes four layers of encapsulation films arranged in a stack, in order from the substrate 100, a first encapsulation film 310, a second encapsulation film 320, a third encapsulation film 330, and a fourth encapsulation film 340. The first encapsulation film 310 has a thickness of 20-60 nm and a refractive index of 1.2-1.6. The second encapsulation film 320 has a thickness of 100-200 nm and a refractive index of 1.7-2.0. The third encapsulation film 330 has a thickness of 300-400 nm and a refractive index of 1.5-1.7. The fourth encapsulation film 340 has a thickness of 30-80 nm and a refractive index of 1.6-1.8. The refractive indices of adjacent encapsulation films differ significantly, forming a significant refractive index difference, amplifying the interference effect, and accurately screening the red, green, blue, and cyan four-color narrow peak spectrum.

[0079] The present embodiment changes the thickness and refractive index of the encapsulation film to change the optical cavity length, i.e., the distance from the corresponding color light-emitting layer to the light-emitting surface, to achieve microcavity control of different color light, thereby obtaining a four-color narrow peak spectrum. The four-color narrow peak spectrum includes red light, green light, blue light, and cyan light.

[0080] The color film layer 400 is located on the side of the encapsulation layer 300 away from the substrate 100, and the color film layer 400 includes four-color filter units for filtering the four-color narrow peak spectrum to output target color light. In the present embodiment, the four-color filter units include a red filter unit 410, a green filter unit 420, a blue filter unit 430, and a cyan filter unit 440 corresponding to the four-color narrow peak spectrum. Filter units of different colors only allow narrow peak spectrum of corresponding wavelengths to pass through, intercepting stray light and improving the purity of the final target color light. Moreover, since the WOLED is a full-surface light-emitting structure, it emits mixed narrow peak spectrum and cannot directly form color pixel light, so each filter unit corresponds to a target color light, such as a blue filter unit that only passes blue light and a cyan filter unit that only passes cyan light, sorting the mixed light into independent color pixel light to provide a color picture basis for terminal display.

[0081] The present application combines the ultra-thin encapsulation layer 300 with the WOLED light-emitting unit to form a microcavity structure, and accurately designs the thickness and refractive index of the encapsulation layer 300 and the distance between the light-emitting layer 200 of each color in the white organic light-emitting diode light-emitting unit and the light-emitting surface of the encapsulation layer 300, achieving a transition from three-color light spectrum to four-color narrow peak spectrum, achieving a four-color ultra-wide color gamut display effect, solving the adverse effects of blue light red shift, red and green light dispersion, and low intensity; At the same time, a color film layer 400 corresponding to the color of the four-color narrow peak spectrum is arranged adjacent to the encapsulation layer 300, which is used to filter the four-color narrow peak spectrum, sort the mixed light into independent color pixel light, and intercept stray light, effectively improving the color gamut and improving the display visual brightness effect.

[0082] It is noted that some embodiments have been described as providing a particular structure or combination of elements. It is intended that elements can be combined in other configurations that are not specifically described in the embodiments. Thus, for example, a presently available mechanism can be used instead of or in addition to the mechanism described herein to perform a described function. It is also contemplated that structure described herein can be altered or combined in various ways, such as by adding, removing or modifying one or more elements. It is further understood that features described with respect to one embodiment can be incorporated in other embodiments. Thus, for example, features described with respect to an apparatus can be incorporated into a method or a system. It is intended that all such alterations and further modifications be considered equivalents of the described embodiments. It is intended that the disclosed embodiments cover all such alterations and further modifications, and are not to be limited to the described embodiments.

[0083] It is intended that the disclosed embodiments cover all such alterations and further modifications, and are not to be limited to the described embodiments.

Claims

1. A display panel, characterized in that, include: substrate; A light-emitting layer is disposed on one side of the substrate. In a direction away from the substrate, the light-emitting layer includes a first electrode, a white organic light-emitting diode (OLED) light-emitting unit, and a second electrode that are sequentially stacked. An encapsulation layer is located on the side of the second electrode away from the substrate, and the encapsulation layer includes multiple encapsulation films; A color filter layer is located on the side of the encapsulation layer away from the substrate, and the color filter layer includes a four-color filter unit.

2. The display panel according to claim 1, characterized in that, The overall thickness of the encapsulation layer is less than or equal to 1.5 μm; Preferably, the overall thickness of the encapsulation layer is 400-800 nm.

3. The display panel according to claim 2, characterized in that, The encapsulation layer comprises at least three encapsulation films; The refractive index of the encapsulation film is 1.2-2.

0.

4. The display panel according to claim 1, characterized in that, The material of the encapsulation film includes at least one of oxides, nitrides, or oxynitrides.

5. The display panel according to claim 1, characterized in that, The white organic light-emitting diode (OLED) light-emitting unit includes a blue light-emitting layer, a green light-emitting layer, and a red light-emitting layer.

6. The display panel according to claim 1, characterized in that, The encapsulation layer is used to output a four-color narrow-peak spectrum by adjusting the thickness and refractive index of the encapsulation film; wherein the four-color narrow-peak spectrum includes red light, green light, blue light and cyan light; The color filter layer is used to filter the four-color narrow-peak spectrum to output the target color light; wherein, the four-color filter unit includes a red filter unit, a green filter unit, a blue filter unit and a cyan filter unit corresponding to the four-color narrow-peak spectrum.

7. The display panel according to claim 1, characterized in that, Also includes A light extraction layer is disposed between the second electrode and the encapsulation layer; A light extraction layer is disposed on the side of the color filter layer away from the substrate.

8. The display panel according to claim 6, characterized in that, The encapsulation layer comprises four encapsulation films stacked together, which are sequentially arranged as a first encapsulation film, a second encapsulation film, a third encapsulation film, and a fourth encapsulation film in a direction away from the substrate. The thickness of the first encapsulation film is 20-60 nm, and the refractive index is 1.2-1.6; The thickness of the second encapsulation film is 100-200 nm, and the refractive index is 1.7-2.0; The thickness of the third encapsulation film is 300-400 nm, and the refractive index is 1.5-1.7; The thickness of the fourth encapsulation film is 30-80 nm, and the refractive index is 1.6-1.

8.

9. The display panel according to claim 5, characterized in that, The side of the encapsulation layer facing away from the substrate is the light-emitting surface; The distance L1 between the side of the second electrode facing away from the substrate and the light-emitting surface is 800-1200 nm; The distance L2 between the side of the blue light-emitting layer facing away from the substrate and the light-emitting surface is 900-1300nm; The distance L3 between the side of the green light-emitting layer facing away from the substrate and the light-emitting surface is 1400-1800 nm; the distance L4 between the side of the first electrode facing away from the substrate and the light-emitting surface is 3000-4000 nm.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1-9.

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