Display panel, preparation method thereof and display device

Abstract

This application provides a display panel, its fabrication method, and a display device, belonging to the field of display technology. The panel includes a substrate and a light-emitting layer disposed on one side of the substrate; at least three encapsulation layers are disposed on the side of the light-emitting layer facing away from the substrate. Each of the at least three encapsulation layers has a different refractive index and a different dimension in a first direction. The refractive index of each of the at least three encapsulation layers is greater than or equal to 1.4 and less than or equal to 2.6. The dimension of each of the at least three encapsulation layers in the first direction is greater than or equal to 100 nm and less than or equal to 600 nm. The display panel, its fabrication method, and the display device provided by this application can improve the color purity of the display panel, thereby enhancing the accuracy of color display.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] In OLED (Organic Light-Emitting Diode) displays, due to the high pixel density, color purity (color gamut) is closely related to the full width at half maximum (FWHM) of the emitted light spectrum. A narrower intrinsic spectrum results in a narrower emitted light spectrum due to the microcavity gain. Therefore, device designs with stringent color gamut requirements necessitate the selection of suitable materials and careful matching of film thickness. However, the narrowing of the intrinsic spectrum of the film material places high demands on its purity and structural integrity, while adjustments to the microcavity offer considerable flexibility. Summary of the Invention

[0003] This application provides a display panel and a method for manufacturing the same, aiming to improve the color purity of the display panel and thus enhance the accuracy of color display.

[0004] The first aspect of this application provides a display panel, including:

[0005] A substrate and a light-emitting layer disposed on one side of the substrate;

[0006] At least three encapsulation layers are disposed on the side of the light-emitting layer opposite to the substrate;

[0007] Wherein, each of the at least three encapsulation layers has a different refractive index and each of the encapsulation layers has a different dimension in the first direction;

[0008] The refractive index of each of the at least three encapsulation layers is greater than or equal to 1.4 and less than or equal to 2.6.

[0009] The dimensions of each of the at least three encapsulation layers in the first direction are greater than or equal to 100 nm and less than or equal to 600 nm.

[0010] Optionally, the at least three encapsulation layers include a first encapsulation layer, a second encapsulation layer, a third encapsulation layer, a fourth encapsulation layer, a fifth encapsulation layer, and a sixth encapsulation layer stacked together;

[0011] Wherein, the refractive index of the first encapsulation layer is less than that of the second encapsulation layer, and the first encapsulation layer is disposed close to the substrate.

[0012] Optionally, in the third, fourth, fifth, and sixth encapsulation layers, the refractive index of each encapsulation layer is:

[0013] N i =N2-(i-2)×K

[0014] Where i is the sequence of each of the encapsulation layers in the first direction, and i is greater than or equal to 3; K is the refractive index, and the value of K is greater than or equal to 0.5;

[0015] And, the size of N2 is greater than or equal to 1.4 and less than or equal to 2.6.

[0016] Optionally, in the third, fourth, fifth, and sixth encapsulation layers, the refractive index of each encapsulation layer is:

[0017] N i =0.0435i 3 -0.5552i 2 +1.9156i +0.5333

[0018] Where i is the sequence of each of the encapsulation layers in the first direction;

[0019] And, N i The value is greater than or equal to 1.4 and less than or equal to 2.6.

[0020] Optionally, in the third, fourth, fifth, and sixth encapsulation layers, the dimensions of each encapsulation layer in the first direction are as follows:

[0021] L i = -131.71N i 2 +685.06N i -542.15

[0022] Where i is the sequence of each of the encapsulation layers in the first direction;

[0023] And, L i The size is greater than or equal to 100nm and less than or equal to 600nm.

[0024] Optionally, in the third, fourth, fifth, and sixth encapsulation layers, the refractive index of each encapsulation layer is:

[0025] N i =-0.125i 2 +0.8921i+0.74

[0026] Where i is the sequence of each of the encapsulation layers in the first direction;

[0027] And, Ni The value is greater than or equal to 1.4 and less than or equal to 2.6.

[0028] Optionally, in the third, fourth, fifth, and sixth encapsulation layers, the dimensions of each encapsulation layer in the first direction are as follows:

[0029] L i =146.76N i +44.71

[0030] Where i is the sequence of each of the encapsulation layers in the first direction;

[0031] And, L i The size is greater than or equal to 100nm and less than or equal to 600nm.

[0032] Optionally, in the third, fourth, fifth, and sixth encapsulation layers, the refractive index of each encapsulation layer is:

[0033] N i =0.0759i 3 -0.8508i 2 +2.7304i-0.1333

[0034] Where i is the sequence of each of the encapsulation layers in the first direction;

[0035] And, N i The value is greater than or equal to 1.4 and less than or equal to 2.6.

[0036] Optionally, in the third, fourth, fifth, and sixth encapsulation layers, the dimensions of each encapsulation layer in the first direction are as follows:

[0037] L i =-291.67N i 2 +1258.3N i -1080

[0038] Where i is the sequence of each of the encapsulation layers in the first direction;

[0039] And, L i The size is greater than or equal to 100nm and less than or equal to 600nm.

[0040] Optionally, the display panel is a top-emitting structure or a bottom-emitting structure.

[0041] Optionally, the material of each of the at least three encapsulation layers includes organic or inorganic materials.

[0042] Optionally, the display panel further includes:

[0043] The packaging structure is disposed on the side of the at least three packaging layers facing away from the substrate.

[0044] Optionally, the display panel includes an OLED display panel, a QLED display panel, or a Micro-LED display panel.

[0045] A second aspect of this application provides a display device, including the display panel provided in the first aspect of this application.

[0046] A third aspect of this application provides a method for manufacturing a display panel, the method comprising:

[0047] Provide substrate;

[0048] A light-emitting layer is formed on the substrate;

[0049] At least three encapsulation layers are formed on the side of the light-emitting layer opposite to the substrate;

[0050] Wherein, each of the at least three encapsulation layers has a different refractive index and each of the encapsulation layers has a different dimension in the first direction;

[0051] The refractive index of each of the at least three encapsulation layers is greater than or equal to 1.4 and less than or equal to 2.6.

[0052] The dimensions of each of the at least three encapsulation layers in the first direction are greater than or equal to 100 nm and less than or equal to 600 nm.

[0053] Beneficial effects:

[0054] This application provides a display panel and its manufacturing method and display device. By setting a substrate, a light-emitting layer and at least three encapsulation layers, wherein each of the at least three encapsulation layers has a different refractive index and a different size in a first direction, the light emission of different wavelengths can be adjusted by adjusting the refractive index and size in the first direction, that is, the spectral half-width is narrowed to a very high degree, thereby enabling the display panel to have higher color purity when displaying colors, and thus improving the accuracy of color display of the display panel. Attached Figure Description

[0055] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the structure of a display panel according to an embodiment of this application;

[0057] Figure 2 This is a graph showing the transmittance of an encapsulation layer with a refractive index lower than 2.6 for different wavelengths, according to an embodiment of this application.

[0058] Figure 3 This is a graph showing the transmittance of a packaging layer with a thickness of 100nm-120nm to light of different wavelengths, according to an embodiment of this application.

[0059] Figure 4 This is a graph showing the narrowing effect of different packaging structures proposed in an embodiment of this application on the red light spectrum;

[0060] Figure 5 This is a graph showing the narrowing effect of different packaging structures on the green light spectrum according to an embodiment of this application;

[0061] Figure 6 This is a graph showing the narrowing effect of different packaging structures proposed in an embodiment of this application on the blue light spectrum;

[0062] Figure 7 This is a flowchart illustrating the steps of a method for manufacturing a display panel according to an embodiment of this application;

[0063] Figure 8 This is a schematic diagram of the substrate fabrication process in a method for preparing a display panel according to an embodiment of this application.

[0064] Figure 9 This is a schematic diagram of the structure for completing the fabrication of the light-emitting layer in a method for manufacturing a display panel according to an embodiment of this application;

[0065] Figure 10 This is a schematic diagram of a method for manufacturing a display panel according to an embodiment of this application, in which at least three encapsulation layers are fabricated.

[0066] Explanation of reference numerals in the attached figures: 10, substrate; 11, light-emitting layer; 21, first encapsulation layer; 22, second encapsulation layer; 23, third encapsulation layer; 24, fourth encapsulation layer; 25, fifth encapsulation layer; 26, sixth encapsulation layer. Detailed Implementation

[0067] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0068] In related technologies, for LCDs (Liquid Crystal Displays), the wavelength of color transmitted by the color filter determines the color purity of the display, which is a common method for solving resolution issues. However, in OLED displays, due to the high pixel density, color purity (color gamut) is closely related to the full width at half maximum (FWHM) of the emitted light spectrum. The narrower the intrinsic spectrum, the narrower the emitted light spectrum will be due to the microcavity gain. Therefore, for device designs with stringent color gamut requirements, it is necessary to select suitable materials and carefully match the film thickness. Related technologies have disclosed methods to achieve specific wavelength filtering through specific structures, thereby improving color purity and color gamut. However, these structures are set at the wavelength level, which is difficult to implement in OLED devices. Furthermore, this structure can cause ghosting in the display, making it unsuitable for high-resolution displays.

[0069] In view of this, embodiments of this application propose a display panel and its manufacturing method and display device. By setting a substrate, a light-emitting layer and at least three encapsulation layers, wherein each of the at least three encapsulation layers has a different refractive index and a different size in a first direction, by adjusting the refractive index and size in the first direction of the different encapsulation layers, the light emission of different wavelengths can be adjusted, that is, a very high degree of spectral width at half maximum (FWHM) narrowing can be achieved, thereby enabling the display panel to have higher color purity when displaying colors, and thus improving the accuracy of color display of the display panel.

[0070] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0071] Reference Figure 1 As shown, this application discloses a display panel, which includes a substrate 10, a light-emitting layer 11 disposed on one side of the substrate, and at least three encapsulation layers.

[0072] Specifically, substrate 10 may include a rigid substrate or a flexible substrate. For example, when the product has a rigid requirement, substrate 10 may be made of a rigid material, such as glass; when the product has a foldable or bendable requirement, substrate 10 may be made of a flexible material, such as PET (polyethylene terephthalate), PI (polyimide), etc.

[0073] Meanwhile, the substrate 10 can be a single-layer structure or a multi-layer structure. Exemplarily, the substrate 10 may include a polyimide layer and a buffer layer stacked sequentially. In other embodiments, the substrate 10 may also include multiple polyimide layers and buffer layers stacked sequentially. The buffer layer may be made of materials such as silicon nitride or silicon oxide to achieve the effect of blocking water and oxygen and blocking alkaline ions. It should be noted that the structure of the substrate 10 is not limited to this; those skilled in the art can determine it according to actual needs in specific applications.

[0074] The substrate 10 may also include a driving circuit, which can drive the light-emitting layer to emit light continuously or intermittently. The driving circuit may include a TFT (Thin Film Transistor) structure. When applied to touch products, the driving circuit can also be connected to a touch chip, and under the control of the touch chip, the driving circuit can drive different areas of the light-emitting layer to emit light.

[0075] A light-emitting layer 11 is disposed on one side of the substrate 10. The light-emitting layer 11 functions to emit light in the display panel, and its structure can vary depending on the display panel. For example, when the display panel is an OLED display panel, the light-emitting layer 11 can include an anode layer, an electron transport layer, a light-emitting material layer, a hole injection layer, a hole transport layer, a cathode layer, etc., stacked sequentially. Furthermore, the light-emitting layer includes multiple sub-pixels, each capable of emitting different colors of light. For instance, the multiple sub-pixels can include red, green, blue, and white sub-pixels, where the red sub-pixels emit red light, the green sub-pixels emit green light, the blue sub-pixels emit blue light, and the white sub-pixels emit white light.

[0076] At least three encapsulation layers are disposed on the side of the light-emitting layer away from the substrate 10, and the at least three encapsulation layers are stacked, wherein the refractive index of each of the at least three encapsulation layers is different, and the size of each encapsulation layer is different in the first direction.

[0077] Specifically, at least three encapsulation layers means that at least three encapsulation layers with different structures are provided on the side of the light-emitting layer 11 away from the substrate 10. For example, three, four, five or six encapsulation layers can be provided on the side of the light-emitting layer away from the substrate. The specific number of encapsulation layers can be designed according to actual needs.

[0078] In these encapsulation layers, the refractive index of each encapsulation layer and the size of each encapsulation layer in the first direction are different.

[0079] The refractive index can be determined by the material of the encapsulation layer. In other words, encapsulation layers made of different materials will have different refractive indices. The encapsulation layer material can be organic, such as epoxy resin, polyurethane, or silicone, or inorganic, such as silicon nitride, silicon oxynitride, or silicon oxide. Encapsulation layers with different refractive indices can refract light of different wavelengths to varying degrees, thus achieving different levels of suppression effects on different wavelengths of light.

[0080] For example, Figure 2 A graph showing the transmittance of an encapsulation layer with a refractive index below 2.6 for light at different wavelengths is presented (the horizontal axis represents light wavelength, and the vertical axis represents light transmittance). (See reference...) Figure 2 As shown, when the refractive index of the encapsulation layer is below 2.6, the encapsulation layer exhibits a relatively strong suppression effect on short-wavelength light (the transmittance of light in the 380nm-480nm band is as low as about 0.83), while it has a relatively weak suppression effect on long-wavelength light (the transmittance of light in the 680nm-780nm band is as low as about 0.9). Therefore, this characteristic can be used to a great extent to narrow the emitted light spectrum.

[0081] Furthermore, the first direction refers to the direction from the substrate 10 to the light-emitting layer 11. Therefore, the dimension of each encapsulation layer in the first direction can also be understood as the thickness of each encapsulation layer. In the embodiments of this application, in addition to using encapsulation layers with different refractive indices, it is also necessary to control the thickness of each encapsulation layer. Encapsulation layers with different thicknesses (different dimensions in the first direction) have different refraction effects on light of different wavelengths.

[0082] For example, Figure 3 The graph shows the transmittance of a 100nm-120nm thick encapsulation layer for different wavelengths of light (the horizontal axis represents wavelength, and the vertical axis represents transmittance). (Refer to...) Figure 3As shown, when the thickness of the encapsulation layer is 100nm-120nm, the encapsulation layer exhibits a relatively strong suppression effect on short-wavelength light (the transmittance of light in the 380nm-480nm band is as low as about 0.85), while it has a relatively weak suppression effect on long-wavelength light (the transmittance of light in the 680nm-780nm band is as low as about 0.9).

[0083] Therefore, by combining the suppression effects of refractive index and thickness on different wavelengths of light, and then utilizing a multi-layer encapsulation structure, it is possible to achieve the effect of filtering light in specific wavelengths. Furthermore, in this embodiment, the effect of the encapsulation layer's stacked structure on light transmittance is within 10% of the original transmittance. That is, there is essentially no significant difference in intensity for the wavelengths that need to be transmitted, but the transmittance for the wavelengths that need to be suppressed can be reduced by more than 30%.

[0084] Furthermore, in the embodiments of this application, the refractive index of each of the at least three encapsulation layers is greater than or equal to 1.4 and less than or equal to 2.6. Exemplarily, the refractive index of the encapsulation layers can be 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, etc. Those skilled in the art can design the refractive index of different encapsulation layers according to actual needs.

[0085] Furthermore, in this embodiment, each of the at least three encapsulation layers has a dimension greater than or equal to 100 nm and less than or equal to 600 nm in the first direction. Exemplarily, the dimension of the encapsulation layer in the first direction can be 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, 550 nm, 600 nm, etc. Those skilled in the art can design the dimensions of different encapsulation layers in the first direction according to actual needs.

[0086] In one alternative implementation, refer to Figure 1 As shown in the figure, this application embodiment provides a display panel in which at least three encapsulation layers are stacked, including a first encapsulation layer 21, a second encapsulation layer 22, a third encapsulation layer 23, a fourth encapsulation layer 24, a fifth encapsulation layer 25 and a sixth encapsulation layer 26.

[0087] Specifically, the first encapsulation layer 21 is disposed close to the substrate, that is, the first encapsulation layer 21 is disposed on the side of the light-emitting layer 11 away from the substrate 10, while the second encapsulation layer 22, the third encapsulation layer 23, the fourth encapsulation layer 24, the fifth encapsulation layer 25 and the sixth encapsulation layer 26 are disposed sequentially on the side of the first encapsulation layer 21 away from the light-emitting layer 11.

[0088] This embodiment primarily addresses the narrowing of the half-width and height of the white light spectrum. The refractive indices of the first encapsulation layer 21 and the second encapsulation layer 22 are fixed, with the refractive index of the first encapsulation layer 21 being less than that of the second encapsulation layer 22. Specifically, the refractive index (N1) of the first encapsulation layer 21 ranges from greater than or equal to 1.4 to less than or equal to 1.7, while the refractive index (N2) of the second encapsulation layer 22 ranges from greater than or equal to 2.0 to less than or equal to 2.6.

[0089] The refractive indices of the other encapsulation layers can be calculated based on the refractive index (N2) of the second encapsulation layer 22, using the following formula:

[0090] N i =N2-(i-2)×K (1)

[0091] Where i is the sequence of each encapsulation layer in the first direction, and i is greater than or equal to 2; N i Let be the refractive index of the i-th encapsulation layer; K is the refractive index, and the value of K is greater than or equal to 0 and less than or equal to 0.3.

[0092] Specifically, the value of i is determined by the order of the encapsulation layers in the first direction. For example, for the first encapsulation layer, the value of i is 1; for the third encapsulation layer, the value of i is 3; for the sixth encapsulation layer, the value of i is 6; and for other encapsulation layers, the value of i is determined according to this order. N i The specific refractive index of each encapsulation layer. For example, N1 is the refractive index of the first encapsulation layer 21, N3 is the refractive index of the third encapsulation layer 23, and N6 is the refractive index of the sixth encapsulation layer 26. The refractive index K can be obtained through a finite number of experiments, and the value of K can be 0.1, 0.2, 0.3, etc.

[0093] The refractive indices of the third encapsulation layer 23, the fourth encapsulation layer 24, the fifth encapsulation layer 25, and the sixth encapsulation layer 26 can be calculated sequentially using the above formula. For example, when the refractive index of the second encapsulation layer 22 is 2.6 and K is 0.3, the refractive index (N3) of the third encapsulation layer 23 can be calculated to be 2.3; the refractive index (N4) of the fourth encapsulation layer 24 is 2.0; the refractive index (N5) of the fifth encapsulation layer 25 is 1.7; and the refractive index (N6) of the sixth encapsulation layer 26 is 1.4.

[0094] It should be noted that in this embodiment, a total of six encapsulation layers are provided. In other embodiments or practical applications, the number of encapsulation layers can be designed according to the requirements, but the refractive index of the corresponding encapsulation layer needs to be calculated according to formula (1).

[0095] In an optional embodiment, this application also provides a display panel in which at least three encapsulation layers include a first encapsulation layer 21, a second encapsulation layer 22, a third encapsulation layer 23, a fourth encapsulation layer 24, a fifth encapsulation layer 25, and a sixth encapsulation layer 26 stacked together.

[0096] Specifically, the first encapsulation layer 21 is disposed close to the substrate, that is, the first encapsulation layer 21 is disposed on the side of the light-emitting layer 11 away from the substrate 10, while the second encapsulation layer 22, the third encapsulation layer 23, the fourth encapsulation layer 24, the fifth encapsulation layer 25 and the sixth encapsulation layer 26 are disposed sequentially on the side of the first encapsulation layer 21 away from the light-emitting layer 11.

[0097] This embodiment primarily targets the narrowing of the half-width and height (WHM) of the red light spectrum (wavelength 600nm-640nm). The refractive indices of the first encapsulation layer 21 and the second encapsulation layer 22 are fixed, with the refractive index of the first encapsulation layer 21 being less than that of the second encapsulation layer 22. Specifically, the refractive index of the first encapsulation layer 21 ranges from greater than or equal to 1.4 to less than or equal to 1.7, while the refractive index of the second encapsulation layer 22 ranges from greater than or equal to 2.0 to less than or equal to 2.6.

[0098] The refractive index of other encapsulation layers can be calculated by the order in which the encapsulation layers are located, using the following formula:

[0099] N i =0.0435i 3 -0.5552i 2 +1.9156i+0.5333 (2)

[0100] Where i is the sequence of each encapsulation layer in the first direction, and N i The specific refractive index of each encapsulation layer.

[0101] Furthermore, in this embodiment, the value of i is greater than or equal to 3 and less than or equal to 6, and N i The value range is greater than or equal to 1.4 and less than or equal to 2.6.

[0102] In this embodiment, the dimension of each encapsulation layer from the third encapsulation layer 23 to the sixth encapsulation layer 26 in the first direction can be calculated based on their respective refractive index, as shown in the following formula:

[0103] L i = -131.71N i 2 +685.06N i -542.15 (3)

[0104] Where i is the sequence of each encapsulation layer in the first direction, and N i The specific refractive index of each encapsulation layer, L i The dimension of each encapsulation layer in the first direction.

[0105] Furthermore, L i The size is greater than or equal to 100nm and less than or equal to 600nm.

[0106] According to formulas (2) and (3), the refractive indices and dimensions in the first direction of the third encapsulation layer 23 to the sixth encapsulation layer 26 are calculated sequentially. The refractive index (N3) of the third encapsulation layer 23 is 2.4578, and the dimension (L3) of the third encapsulation layer 23 in the first direction is 345.9592 nm; the refractive index (N4) of the fourth encapsulation layer 24 is 2.0965, and the dimension (L4) of the fourth encapsulation layer 24 in the first direction is 315.1717 nm; the refractive index (N5) of the fifth encapsulation layer 25 is 1.6688, and the dimension (L5) of the fifth encapsulation layer 25 in the first direction is 234.2798 nm; the refractive index (N6) of the sixth encapsulation layer 26 is 1.4357, and the dimension (L6) of the sixth encapsulation layer 26 in the first direction is 169.9054 nm.

[0107] Furthermore, the display panel may also include a packaging structure disposed on the side of at least three packaging layers facing away from the substrate. The packaging structure may include a middle packaging layer and a top packaging layer. Specifically, the middle packaging layer is disposed between the at least three packaging layers and the top packaging layer.

[0108] Figure 4 The graphs show the narrowing effect of different packaging structures on the red light spectrum. Figure 4 In the diagram, the horizontal axis represents the wavelength of the light, and the vertical axis represents the intensity of the light. Taking the spectrum of wavelengths from 380nm to 780nm with an intensity of 1 (PL1) and the normal spectrum (normal PL) as examples, the spectra of the two types of light can be obtained under the following conditions: no encapsulation, at least three encapsulation layers, at least three encapsulation layers plus an encapsulation structure, and conventional encapsulation. Furthermore, after calculation, the full width at half maximum (FWHM) of the red light spectrum under each condition can be obtained, as shown in Table 1.

[0109] Table 1

[0110]

[0111] As shown in Table 1, in the spectrum with an intensity of 1, the at least three-layer encapsulation structure provided in this application embodiment reduces the full width at half maximum (FWHM) of the red light emission wavelength to 7.2 nm. Even with the encapsulation structure, the FWHM of the red light emission wavelength only fluctuates slightly to 9.4 nm. In the conventional spectrum, the FWHM of the red light emission wavelength is also basically stable at around 9 nm. The FWHM values ​​under both unencapsulated and conventional encapsulation conditions are greater than 30 nm. It can be seen that the embodiments of this application can achieve a very high degree of narrowing of the spectral FWHM, thereby greatly improving color purity and enhancing the accuracy of color display.

[0112] In an optional embodiment, this application also provides a display panel in which at least three encapsulation layers include a first encapsulation layer 21, a second encapsulation layer 22, a third encapsulation layer 23, a fourth encapsulation layer 24, a fifth encapsulation layer 25, and a sixth encapsulation layer 26 stacked together.

[0113] Specifically, the first encapsulation layer 21 is disposed close to the substrate, that is, the first encapsulation layer 21 is disposed on the side of the light-emitting layer 11 away from the substrate 10, while the second encapsulation layer 22, the third encapsulation layer 23, the fourth encapsulation layer 24, the fifth encapsulation layer 25 and the sixth encapsulation layer 26 are disposed sequentially on the side of the first encapsulation layer 21 away from the light-emitting layer 11.

[0114] This embodiment primarily targets the narrowing of the half-width and height (WHM) of the green light spectrum (wavelength 520nm-560nm). The refractive indices of the first encapsulation layer 21 and the second encapsulation layer 22 are fixed, with the refractive index of the first encapsulation layer 21 being less than that of the second encapsulation layer 22. Specifically, the refractive index of the first encapsulation layer 21 ranges from greater than or equal to 1.4 to less than or equal to 1.7, while the refractive index of the second encapsulation layer 22 ranges from greater than or equal to 2.0 to less than or equal to 2.6.

[0115] The refractive index of other encapsulation layers can be calculated by the order in which the encapsulation layers are located, using the following formula:

[0116] N i =-0.125i 2 +0.8921i+0.74 (4)

[0117] Where i is the sequence of each encapsulation layer in the first direction, and N i The specific refractive index of each encapsulation layer.

[0118] Furthermore, in this embodiment, the value of i is greater than or equal to 3 and less than or equal to 6, and N i The value range is greater than or equal to 1.4 and less than or equal to 2.6.

[0119] In this embodiment, the dimension of each encapsulation layer from the third encapsulation layer 23 to the sixth encapsulation layer 26 in the first direction can be calculated based on their respective refractive index, as shown in the following formula:

[0120] L i =146.76N i +44.71 (5)

[0121] Where i is the sequence of each encapsulation layer in the first direction, and N i The specific refractive index of each encapsulation layer, L i The dimension of each encapsulation layer in the first direction.

[0122] Furthermore, L i The size is greater than or equal to 100nm and less than or equal to 600nm.

[0123] According to formulas (4) and (5), the refractive indices and dimensions in the first direction of the third encapsulation layer 23 to the sixth encapsulation layer 26 are calculated sequentially. The refractive index of the third encapsulation layer 23 (N3) is 2.2913, and the dimension (L3) of the third encapsulation layer 23 in the first direction is 380.9812 nm; the refractive index (N4) of the fourth encapsulation layer 24 is 2.3084, and the dimension (L4) of the fourth encapsulation layer 24 in the first direction is 383.4908 nm; the refractive index (N5) of the fifth encapsulation layer 25 is 2.0755, and the dimension (L5) of the fifth encapsulation layer 25 in the first direction is 349.3104 nm; the refractive index (N6) of the sixth encapsulation layer 26 is 1.5926, and the dimension (L6) of the sixth encapsulation layer 26 in the first direction is 278.4400 nm.

[0124] Figure 5 The graphs show the narrowing effect of different packaging structures on the green light spectrum. Figure 5 In the diagram, the horizontal axis represents the wavelength of the light, and the vertical axis represents the intensity of the light. Taking the spectrum with an intensity of 1 in the wavelength range of 380nm-780nm (PL1) and the normal spectrum (normal PL) as examples, the spectra of the two types of light can be obtained under the following conditions: no encapsulation, at least three encapsulation layers, at least three encapsulation layers plus an encapsulation structure, and conventional encapsulation. Furthermore, after calculation, the full width at half maximum (FWHM) of the green light spectrum under each condition can be obtained, as shown in Table 2.

[0125] Table 2

[0126]

[0127] As shown in Table 1, in the spectrum with an intensity of 1, the full width at half maximum (FWHM) of the green light emission wavelength is reduced to 8.1 nm-10.5 nm using the at least three-layer encapsulation structure provided in this application embodiment. With the encapsulation structure added, the FWHM of the green light emission wavelength is further reduced to 6.7 nm-8 nm. In the conventional spectrum, the FWHM of the green light emission wavelength is also narrowed to 7 nm-9 nm. The FWHM values ​​under both unencapsulated and conventional encapsulation conditions are greater than 30 nm. It can be seen that the embodiments of this application can achieve a very high degree of narrowing of the spectral FWHM, thereby greatly improving color purity and enhancing the accuracy of color display.

[0128] In an optional embodiment, this application also provides a display panel in which at least three encapsulation layers include a first encapsulation layer 21, a second encapsulation layer 22, a third encapsulation layer 23, a fourth encapsulation layer 24, a fifth encapsulation layer 25, and a sixth encapsulation layer 26 stacked together.

[0129] Specifically, the first encapsulation layer 21 is disposed close to the substrate, that is, the first encapsulation layer 21 is disposed on the side of the light-emitting layer 11 away from the substrate 10, while the second encapsulation layer 22, the third encapsulation layer 23, the fourth encapsulation layer 24, the fifth encapsulation layer 25 and the sixth encapsulation layer 26 are disposed sequentially on the side of the first encapsulation layer 21 away from the light-emitting layer.

[0130] This embodiment primarily targets the narrowing of the half-width and height (WHM) of the blue light spectrum (wavelength 430nm-470nm). The refractive indices of the first encapsulation layer 21 and the second encapsulation layer 22 are fixed, with the refractive index of the first encapsulation layer 21 being less than that of the second encapsulation layer 22. Specifically, the refractive index of the first encapsulation layer 21 ranges from greater than or equal to 1.4 to less than or equal to 1.7, while the refractive index of the second encapsulation layer 22 ranges from greater than or equal to 2.0 to less than or equal to 2.6.

[0131] The refractive index of other encapsulation layers can be calculated by the order in which the encapsulation layers are located, using the following formula:

[0132] N i =0.0759i 3 -0.8508i 2 +2.7304i-0.1333 (6)

[0133] Where i is the sequence of each encapsulation layer in the first direction, and N i The specific refractive index of each encapsulation layer.

[0134] Furthermore, in this embodiment, the value of i is greater than or equal to 3 and less than or equal to 6, and N iThe value range is greater than or equal to 1.4 and less than or equal to 2.6.

[0135] In this embodiment, the dimension of each encapsulation layer from the third encapsulation layer 23 to the sixth encapsulation layer 26 in the first direction can be calculated based on their respective refractive index, as shown in the following formula:

[0136] L i =-291.67N i 2 +1258.3N i -1080 (7)

[0137] Where i is the sequence of each encapsulation layer in the first direction, and N i The specific refractive index of each encapsulation layer, L i The dimension of each encapsulation layer in the first direction.

[0138] Furthermore, L i The size is greater than or equal to 100nm and less than or equal to 600nm.

[0139] According to formulas (6) and (7), the refractive indices and dimensions in the first direction of the third encapsulation layer 23 to the sixth encapsulation layer 26 are calculated sequentially. The refractive index (N3) of the third encapsulation layer 23 is 2.45, and the dimension (L3) of the third encapsulation layer 23 in the first direction is 252.0858 nm; the refractive index (N4) of the fourth encapsulation layer 24 is 2.0331, and the dimension (L4) of the fourth encapsulation layer 24 in the first direction is 272.6331 nm; the refractive index (N5) of the fifth encapsulation layer 25 is 1.7362, and the dimension (L5) of the fifth encapsulation layer 25 in the first direction is 225.4532 nm; the refractive index (N6) of the sixth encapsulation layer 26 is 2.0147, and the dimension (L6) of the sixth encapsulation layer 26 in the first direction is 271.2038 nm.

[0140] Figure 6 The graphs show the narrowing effect of different packaging structures on the blue light spectrum. Figure 6 In the diagram, the horizontal axis represents the wavelength of the light, and the vertical axis represents the intensity of the light. Taking the spectrum with an intensity of 1 in the wavelength range of 380nm-780nm (PL1) and the normal spectrum (normal PL) as examples, the spectra of the two types of light can be obtained under the following conditions: no encapsulation, at least three encapsulation layers, at least three encapsulation layers plus an encapsulation structure, and conventional encapsulation. Furthermore, after calculation, the full width at half maximum (FWHM) of the blue light spectrum under each condition can be obtained, as shown in Table 3.

[0141] Table 3

[0142]

[0143] As can be seen from Table 1, in the spectrum with an intensity of 1, the full width at half maximum (FWHM) of the blue light emission wavelength is reduced to 7nm-10nm through the at least three-layer encapsulation structure provided in this application embodiment. Even with the encapsulation structure, the FWHM of the blue light emission wavelength only fluctuates slightly to 11nm-13nm. In the conventional spectrum, the FWHM of the blue light emission wavelength is also basically stable at around 10.6nm-13nm. It can be seen that the embodiments of this application can achieve a very high degree of narrowing of the spectral FWHM, thereby greatly improving color purity and enhancing the accuracy of color display.

[0144] In one embodiment, the display panel of this application may include a top-emitting structure or a bottom-emitting structure.

[0145] Top-emitting structures refer to structures where light is emitted in a direction away from the substrate. In top-emitting structures, high-refractive-index materials can be spin-coated or printed, while low-refractive-index materials can be stacked on the encapsulation layer using conventional inorganic film layers. This suppresses the light intensity of other wavelengths without affecting specific wavelengths, achieving an effect equivalent to a color filter. However, color gamut enhancement can be achieved through simple film layer stacking. Bottom-emitting structures refer to structures where light is emitted in a direction towards the substrate. In bottom-emitting structures, at least three encapsulation layers can be placed between the anode layer and the substrate. Adjusting the refractive index of other common films (such as planarization layers, gate layers, etc.) in the bottom-emitting structure can also improve color purity.

[0146] In one embodiment, the display panel described in this application may include an OLED display panel, a QLED (Quantum Dot Light Emitting Diodes) display panel, or a Micro-LED display panel.

[0147] Based on the same inventive concept, embodiments of this application disclose a display device, including any of the display panels described above in the embodiments of this application.

[0148] Specifically, the display device may include computer monitors, televisions, billboards, laser printers with display functions, telephones, mobile phones, personal digital assistants (PDAs), laptops, digital cameras, portable camcorders, viewfinders, vehicles, large walls, theater screens, or stadium signs, etc.

[0149] Figure 7 A flowchart illustrating the steps of a method for fabricating a display panel is shown. (Refer to...) Figure 7As shown in the embodiments of this application, a method for manufacturing a display panel is also provided, the method comprising:

[0150] Step 301: Provide substrate 10.

[0151] Specifically, the substrate 10 can be a rigid substrate or a flexible substrate, which can be selected by those skilled in the art according to the product requirements. Furthermore, the step of providing the substrate 10 may also include steps such as completing the driving circuit, etc. Figure 8 As shown.

[0152] Step 302: Form a light-emitting layer on the substrate.

[0153] Specifically, the light-emitting layer 11 can include different structures for different display panels. For example, when the display panel is an OLED display panel, the light-emitting layer 11 can include an anode layer, an electron transport layer, a light-emitting material layer, a hole injection layer, a hole transport layer, a cathode layer, etc., stacked sequentially, such as... Figure 9 As shown.

[0154] Step 303: Form at least three encapsulation layers on the side of the light-emitting layer away from the substrate.

[0155] Specifically, each of the at least three encapsulation layers has a different refractive index, and each encapsulation layer has a different dimension in the first direction. Furthermore, the refractive index of each of the at least three encapsulation layers is greater than or equal to 1.4 and less than or equal to 2.6; the dimension of each of the at least three encapsulation layers in the first direction is greater than or equal to 100 nm and less than or equal to 600 nm. Figure 10 As shown.

[0156] The display panel prepared by the above method can achieve the adjustment of light output in different bands by adjusting the refractive index of different encapsulation layers and the size in the first direction. That is, it can achieve a very high degree of narrowing of the full width at half maximum (FWHM), thereby making the display panel have higher color purity when displaying colors, and thus improving the accuracy of color display of the display panel.

[0157] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0158] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "includes a..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0159] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A display panel, characterized in that, include: A substrate and a light-emitting layer disposed on one side of the substrate; At least three encapsulation layers are disposed on the side of the light-emitting layer opposite to the substrate; Wherein, each of the at least three encapsulation layers has a different refractive index and each of the encapsulation layers has a different dimension in the first direction; The refractive index of each of the at least three encapsulation layers is greater than or equal to 1.4 and less than or equal to 2.

6. The dimensions of each of the at least three encapsulation layers in the first direction are greater than or equal to 100 nm and less than or equal to 600 nm. The at least three encapsulation layers include a first encapsulation layer, a second encapsulation layer, a third encapsulation layer, a fourth encapsulation layer, a fifth encapsulation layer, and a sixth encapsulation layer stacked together. Wherein, the refractive index of the first encapsulation layer is less than that of the second encapsulation layer, and the first encapsulation layer is disposed close to the substrate; Among them, the refractive index of the first encapsulation layer and the refractive index of the second encapsulation layer remain unchanged for light passing through different wavelengths of the encapsulation layer; The formula for calculating the refractive index of the third encapsulation layer to the sixth encapsulation layer varies depending on the amount of light transmitted through the encapsulation layer. The light rays include white light, red light, green light, and blue light.

2. The display panel according to claim 1, characterized in that: The refractive index of each of the third, fourth, fifth, and sixth encapsulation layers is as follows: Where i is the sequence of each of the encapsulation layers in the first direction, and i is greater than or equal to 3; K is the refractive index, and the value of K is greater than or equal to 0 and less than or equal to 0.3; And, the size of N2 is greater than or equal to 2.0 and less than or equal to 2.

6.

3. The display panel according to claim 1, characterized in that: The refractive index of each of the third, fourth, fifth, and sixth encapsulation layers is as follows: Where i is the sequence of each of the encapsulation layers in the first direction; and N i is greater than or equal to 1.4 and less than or equal to 2.

6.

4. The display panel according to claim 3, characterized in that: In the third, fourth, fifth, and sixth encapsulation layers, the dimensions of each encapsulation layer in the first direction are as follows: Where i is the sequence of each of the encapsulation layers in the first direction; and L i have a size greater than or equal to 100 nm and less than or equal to 600 nm.

5. The display panel according to claim 1, characterized in that: The refractive index of each of the third, fourth, fifth, and sixth encapsulation layers is as follows: Where i is the sequence of each of the encapsulation layers in the first direction; And, N i The value is greater than or equal to 1.4 and less than or equal to 2.

6.

6. The display panel according to claim 5, characterized in that: In the third, fourth, fifth, and sixth encapsulation layers, the dimensions of each encapsulation layer in the first direction are as follows: Where i is the sequence of each of the encapsulation layers in the first direction; And, L i The size is greater than or equal to 100nm and less than or equal to 600nm.

7. The display panel according to claim 1, characterized in that: The refractive index of each of the third, fourth, fifth, and sixth encapsulation layers is as follows: Where i is the sequence of each of the encapsulation layers in the first direction; And, N i The value is greater than or equal to 1.4 and less than or equal to 2.

6.

8. The display panel according to claim 7, characterized in that: In the third, fourth, fifth, and sixth encapsulation layers, the dimensions of each encapsulation layer in the first direction are as follows: Where i is the sequence of each of the encapsulation layers in the first direction; And, L i The size is greater than or equal to 100nm and less than or equal to 600nm.

9. The display panel according to any one of claims 1-8, characterized in that: The display panel is either a top-emitting structure or a bottom-emitting structure.

10. The display panel according to any one of claims 1-8, characterized in that: The material of each of the at least three encapsulation layers includes organic or inorganic materials.

11. The display panel according to any one of claims 1-8, characterized in that, The display panel also includes: The packaging structure is disposed on the side of the at least three packaging layers facing away from the substrate.

12. The display panel according to any one of claims 1-8, characterized in that: The display panel includes an OLED display panel, a QLED display panel, or a Micro-LED display panel.

13. A display device, characterized in that, Includes the display panel as described in any one of claims 1-12.

14. A method for manufacturing a display panel, characterized in that, The preparation method includes: Provide substrate; A light-emitting layer is formed on the substrate; At least three encapsulation layers are formed on the side of the light-emitting layer opposite to the substrate; Wherein, each of the at least three encapsulation layers has a different refractive index and each of the encapsulation layers has a different dimension in the first direction; The refractive index of each of the at least three encapsulation layers is greater than or equal to 1.4 and less than or equal to 2.

6. The dimensions of each of the at least three encapsulation layers in the first direction are greater than or equal to 100 nm and less than or equal to 600 nm. The at least three encapsulation layers include a first encapsulation layer, a second encapsulation layer, a third encapsulation layer, a fourth encapsulation layer, a fifth encapsulation layer, and a sixth encapsulation layer stacked together. Wherein, the refractive index of the first encapsulation layer is less than that of the second encapsulation layer, and the first encapsulation layer is disposed close to the substrate; Among them, the refractive index of the first encapsulation layer and the refractive index of the second encapsulation layer remain unchanged for light passing through different wavelengths of the encapsulation layer; The formula for calculating the refractive index of the third encapsulation layer to the sixth encapsulation layer varies depending on the amount of light transmitted through the encapsulation layer. The light rays include white light, red light, green light, and blue light.

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