CN112993186B - Display panel, display device and preparation method - Google Patents

Display panel, display device and preparation method Download PDF

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Publication number
CN112993186B
CN112993186B CN202110172432.0A CN202110172432A CN112993186B CN 112993186 B CN112993186 B CN 112993186B CN 202110172432 A CN202110172432 A CN 202110172432A CN 112993186 B CN112993186 B CN 112993186B
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thickness
layer
inorganic layer
efficiency
display panel
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CN112993186A (en
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曾诚
李瑞涛
李英宰
李东健
陈菲
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/844—Encapsulations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission
    • H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars
    • H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/52—Encapsulations
    • H01L33/54—Encapsulations having a particular shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
    • H01L2933/0008—Processes
    • H01L2933/0033—Processes relating to semiconductor body packages
    • H01L2933/005—Processes relating to semiconductor body packages relating to encapsulations

Abstract

The invention discloses a display panel, a display device and a preparation method, which can solve the problem that the periphery of a display area of a display device in the prior art is reddish. Wherein, the display panel includes: the driving circuit is connected with the electroluminescent film layer and is used for driving the electroluminescent film layer to emit light rays with different wavelengths; the metal layer in the electroluminescent film layer is of a first thickness, light rays with different wavelengths are emitted into the first inorganic layer through the metal layer, the thickness range of the first inorganic layer is [0.04um,0.08um ], and the refractive index range is [1.47,1.52]; the light emitted from the first inorganic layer is emitted into the film packaging layer, wherein the second inorganic layer in the film packaging layer has a second thickness, the refractive index is 1.73, and the sum of the thickness of the first inorganic layer and the second thickness is not more than 1um.

Description

Display panel, display device and preparation method
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a display device and a preparation method.
Background
At present, in the process of preparing the display panel, a film packaging layer is usually formed on the electroluminescent film layer, so that the water vapor of the external environment is prevented from entering the electroluminescent film layer to influence the performance of the electroluminescent film layer. In the prior art, the thin film encapsulation layer is generally prepared by adopting a plasma vapor deposition method, so that the thickness of an edge area in the thin film encapsulation layer is thinner than that of a middle area, and the periphery of a display area of a display device provided with the display panel is red.
Disclosure of Invention
The embodiment of the invention provides a display panel, a display device and a preparation method, which can solve the problem that the periphery of a display area of the display device in the prior art is reddish.
In a first aspect, a display panel includes a substrate, a driving circuit, an electroluminescent film layer, a first inorganic layer, and a thin film encapsulation layer stacked; wherein, the liquid crystal display device comprises a liquid crystal display device,
the driving circuit is connected with the electroluminescent film layer and is used for driving the electroluminescent film layer to emit light rays with different wavelengths; the metal layer in the electroluminescent film layer is of a first thickness, the light rays with different wavelengths are emitted into the first inorganic layer through the metal layer, the thickness range of the first inorganic layer is [0.04um,0.08um ], and the refractive index range is [1.47,1.52];
the light emitted from the first inorganic layer is incident into the film packaging layer, wherein the second inorganic layer in the film packaging layer has a second thickness, the refractive index is 1.73, and the sum of the thickness of the first inorganic layer and the second thickness is not more than 1um.
In the embodiment of the invention, the metal layer in the electroluminescent film layer is set to be a first thickness, the second inorganic layer in the film packaging layer is set to be a second thickness, and a first inorganic layer with a low refractive index is added between the metal layer and the second inorganic layer, namely, the refractive index of the first inorganic layer is lower than that of the second inorganic layer, and meanwhile, the sum of the thickness of the first inorganic layer and the thickness of the second inorganic layer is not more than 1um, so that the absorption rate is increased and the transmittance is reduced when red light sequentially passes through the metal layer, the first inorganic layer and the edge area of the second inorganic layer, and the redness problem around the display area of the display device can be reduced.
Optionally, the thickness value of the first inorganic layer is 0.08um.
In the embodiment of the invention, the thickness of the newly added first inorganic layer is set to be 0.08um, and part of red light emitted to the edge of the second inorganic layer can be absorbed, so that the problem of redness around the display area in the display device is reduced.
Optionally, the refractive index of the first inorganic layer is 1.47.
In the embodiment of the invention, when the refractive index of the first inorganic layer is 1.47, the optical path of the red light can be changed when the red light is emitted to the edge area of the second inorganic layer, so that the light quantity of the red light emitted to the edge area of the second inorganic layer is reduced, and the red-emitting problem around the display area in the display device is further reduced.
Optionally, the second thickness is [0.88um,0.92um ].
In the embodiment of the invention, the thickness of the second inorganic layer is set to be 0.88um and 0.92um, so that the increase of the whole thickness of the display panel after the first inorganic layer is added can be avoided.
Optionally, the second thickness is 0.92um.
In the embodiment of the invention, the second thickness of the second inorganic layer cannot be set too small, otherwise, the driving circuit and the electroluminescent film layer cannot be packaged, so that the aim of preventing water vapor from entering the driving circuit and the electroluminescent film layer is fulfilled.
Optionally, the first thickness is [0nm,20nm ].
In the embodiment of the invention, the thickness of the metal layer is set to be [0nm,20nm ], so that the material of part of the metal layer can be saved on the basis of ensuring that the periphery of a display area in the display device does not have the problem of redness.
Optionally, the first thickness is 0nm.
According to the embodiment of the invention, when the thickness of the metal layer is 0nm, the material of the metal layer can be saved to the maximum extent on the basis that the redness problem can not occur at the periphery of the display area in the display device.
Optionally, the first inorganic layer is silicon oxide.
In the embodiment of the invention, under the condition that the refractive index of the first inorganic layer is required to be lower than that of the second inorganic layer, the first inorganic layer can be prepared by adopting silicon oxide, so that the parameter requirement of the first inorganic layer on the refractive index is met.
In a second aspect, embodiments of the present invention provide a display device, including a display panel according to any embodiment of the first aspect.
In a third aspect, an embodiment of the present invention provides a method for manufacturing a display panel, where the method includes:
preparing a driving circuit and an anode structure on a substrate;
preparing an electroluminescent film layer on the driving circuit, wherein the electroluminescent film layer comprises at least three sub-pixel areas, each sub-pixel emits light with one wavelength, and the thickness of a metal layer in the electroluminescent film layer is a first thickness;
preparing a first inorganic layer on the electroluminescent film layer based on a plasma vapor deposition method, wherein the thickness of the first inorganic layer ranges from [0.04um,0.08um ], and the refractive index range is [1.47,1.52];
forming a second inorganic layer on the first inorganic layer based on a plasma vapor deposition method, wherein the thickness of the second inorganic layer is a second thickness, and the refractive index is 1.73, and the sum of the thickness of the first inorganic layer and the second thickness is not more than 1um;
forming a first organic layer on the second inorganic layer based on an inkjet printing process, the first organic layer having a thickness of [8um,10um ] and a refractive index of 1.53;
and forming a third inorganic layer on the first organic layer based on a plasma vapor deposition method, wherein the thickness of the third inorganic layer is [0.5um,0.8um ], the refractive index is 1.83, and the second inorganic layer, the first organic layer and the third inorganic layer jointly form a film packaging layer.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 3 is a graph showing the correspondence between the light efficiency and the thickness of the second inorganic layer according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 5 is a graph showing the correspondence between red light efficiency and metal layer thickness according to an embodiment of the present invention;
FIG. 6 is a graph showing the correspondence between green light efficiency and metal layer thickness provided by an embodiment of the present invention;
FIG. 7 is a graph showing the relationship between blue light efficiency and thickness of a metal layer according to an embodiment of the present invention;
FIG. 8 is a graph showing the correspondence between red light efficiency and the thickness of the first inorganic layer according to an embodiment of the present invention;
FIG. 9 is a graph showing the correspondence between green light efficiency and the thickness of the first inorganic layer according to an embodiment of the present invention;
FIG. 10 is a graph showing the relationship between blue light efficiency and the thickness of the first inorganic layer according to the embodiment of the present invention;
FIG. 11 is a diagram showing a change in red light absorption rate in a display area of a conventional display device according to an embodiment of the present invention;
FIG. 12 is a diagram showing the change of the red light absorption rate in the display area of the new display device according to the embodiment of the present invention;
fig. 13 is a schematic flow chart of a method for manufacturing a display panel according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Luminous efficiency: the light emission luminance of the display device at a unit power is shown. That is, the higher the light emission efficiency, the higher the light emission luminance.
Fig. 1 is a schematic structural diagram of a conventional display panel. Fig. 1 includes a substrate 101, a driving circuit 102, an electroluminescent film layer 103, and a thin film encapsulation layer 104, which are stacked.
The driving circuit 102 is connected to the electroluminescent film layer 103, and is configured to provide a driving voltage or a driving current to the electroluminescent film layer 103. There is no particular limitation on whether the electroluminescent film layer 103 is driven by a current or a voltage.
The electroluminescent film layer 103 is used for emitting light rays with different wavelengths. Specifically, referring to fig. 2, the electroluminescent film layer 103 mainly includes a pixel defining layer 1031, a subpixel 1032, and a metal layer 1033. The pixel defining layer 1031 includes a plurality of grooves therein, each of which has a subpixel 1032 disposed therein. I.e., the pixel definition layer 1031 is mainly used to prevent interference from being formed between the respective sub-pixels 1032. It should be understood that in order for the display panel to be capable of assuming a wide variety of colors, sub-pixel 1032 should include at least three types: the red sub-pixel, the green sub-pixel, and the blue sub-pixel, that is, the sub-pixels corresponding to the three primary colors, may be provided with sub-pixels of other colors according to actual needs, and are not particularly limited herein. The metal layer 1033 is mainly used for protecting the sub-pixel 1032, and the metal layer 1033 has a thickness of [60nm,80nm ] and a refractive index of [1.3,1.4].
The thin film packaging layer 104 is mainly used for packaging the driving circuit 102 and the electroluminescent film layer 103, so as to prevent water vapor from entering the driving circuit 102 and the electroluminescent film layer 103. Specifically, referring to fig. 2, the thin film encapsulation layer 104 mainly includes a second inorganic layer 1041, a first organic layer 1042, and a third inorganic layer 1043. Wherein the second inorganic layer 1041 has a thickness of 1um and a refractive index of 1.73, and the main constituent material is silicon oxynitride; the first organic layer 1042 has a thickness of [8um,10um ] and a refractive index of 1.53, and the main constituent material is methyl methacrylate; the third organic layer has a thickness of [0.5um,0.8um ], and a refractive index of [1.83,1.85], and the main constituent material is silicon nitride.
In the prior art, in preparing the second inorganic layer 1041 in the thin film encapsulation layer 104, a plasma vapor deposition method is generally used, which causes the edge region of the second inorganic layer 1041 to be thinner than the central region. As a practical result, if the second inorganic layer 1041 having an overall thickness of 1um is required to be formed, the thickness of the central region of the second inorganic layer 1041 prepared by the plasma vapor deposition method may reach 1um, and the thickness of the edge region may reach 0.9um, that is, the above preparation process may result in a reduction of about 10% in the thickness of the edge region of the second inorganic layer 1041 compared to the thickness of the central region.
Referring to fig. 3, the abscissa indicates the thickness of the second inorganic layer 1041 (CVD 1), and the ordinate indicates the efficiency (Eff) of emitting each light ray from the display region of the display device. Wherein, the curve of square block represents red light efficiency, the curve of circular block represents green light efficiency, and the curve of triangle block represents blue light efficiency.
When the thickness of the second inorganic layer 1041 (CVD 1) is 1000nm (i.e., 1 um), the Red (Red) efficiency is 100% (see the curve of the square block in fig. 3), the Green (Green) efficiency is 100% (see the curve of the circular block in fig. 3), and the Blue (Blue) efficiency is 100% (see the curve of the triangle block in fig. 3) in the display area of the display device; when the thickness of the second inorganic layer 1041 (CVD 1) is 900nm (i.e., 0.9 um), the efficiency of red light is 105.5% (see the curve of the square block in fig. 3), the efficiency of green light is 102% (see the curve of the circular block in fig. 3), and the efficiency of blue light is 101.5% (see the curve of the triangle block in fig. 3) in the display area of the display device. For the same second inorganic layer 1041 (CVD 1), since the thickness of the edge region is 900nm and the thickness of the center region is 1000nm, the efficiency of red light emitted from the edge region (105.5%) is significantly higher than that of red light emitted from the center region (100%), resulting in a problem of redness around the display region in the display device.
In view of this, in the embodiment of the present invention, by setting the metal layer in the electroluminescent film layer to the first thickness, setting the second inorganic layer in the thin film encapsulation layer to the second thickness, and adding a first inorganic layer with a low refractive index between the metal layer and the second inorganic layer, that is, the refractive index of the first inorganic layer is lower than that of the second inorganic layer, and at the same time, the sum of the thicknesses of the first inorganic layer and the second inorganic layer is not more than 1um, the absorption rate increases and the transmittance decreases when red light sequentially passes through the edge regions of the metal layer, the first inorganic layer, and the second inorganic layer, so that the redness problem occurring around the display region of the display device can be reduced.
In order to better understand the above technical solutions, the following detailed description of the technical solutions of the present invention is made by using the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and the embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and not limiting the technical solutions of the present invention, and the technical features of the embodiments and the embodiments of the present invention may be combined with each other without conflict.
Fig. 4 is a schematic diagram of a new display panel according to an embodiment of the invention. Fig. 4 is different from fig. 2 in that the metal layer 1034 is provided to a first thickness, the second inorganic layer 1044 is provided to a second thickness, and the first inorganic layer 105 is newly added between the metal layer 1034 and the second inorganic layer 1044.
Specifically, the main constituent material of the first inorganic layer 105 is silicon oxide, and the refractive index of the first inorganic layer 105 is [1.47,1.52], that is, the lowest refractive index that can be achieved by the first inorganic layer 105 in the prior art is 1.47. The second thickness of the second inorganic layer 1044 is [0.88um,0.92um ], the thickness of the first inorganic layer is [0.04um,0.08um ], and the first thickness of the metal layer 1034 is [0nm,20nm ]. It should be understood that, in order to avoid increasing the thickness of the entire display panel, the sum of the thickness of the first inorganic layer 105 and the second thickness should not exceed 1um (the thickness of the second inorganic layer in the related art).
The following description will be made with respect to the efficiency of the light rays of the respective colors emitted from the display region (i.e., the middle region and the edge region) of the display device when the thickness of the metal layer 1034 is changed and the thickness of the first inorganic layer 105 is changed, respectively.
1. Based on the thickness variation of the metal layer 1034, the efficiency of the light rays of the respective colors emitted from the display region (i.e., the middle region and the edge region) of the display device can be seen in fig. 5 to 7; in fig. 5, the abscissa indicates the thickness of the second inorganic layer 1044 (CVD 1), and the ordinate indicates the red light efficiency (r_eff) emitted from the display region of the display device when the thickness of the metal layer 1034 is changed; in fig. 6, the abscissa indicates the thickness of the second inorganic layer 1044 (CVD 1), and the ordinate indicates the green light efficiency (g_eff) emitted from the display region of the display device when the thickness of the metal layer 1034 is changed; in fig. 7, the abscissa indicates the thickness of the second inorganic layer 1044 (CVD 1), and the ordinate indicates the blue efficiency (b_eff) emitted from the display region of the display device when the thickness of the metal layer 1034 is changed. The thickness of metal layer 1034 is shown in fig. 5-7 as: the curves of 0nm,10nm,20nm,30nm,40nm,50nm and 60nm are changed, and in order to be able to distinguish the above-mentioned curves, the curve where the diamond blocks are located represents that the first thickness of the metal layer 1034 is set to 0nm, the curve where the square blocks are located represents that the first thickness of the metal layer 1034 is set to 10nm, the curve where the triangle blocks are located represents that the first thickness of the metal layer 1034 is set to 20nm, the curve where the x-shaped mark is located represents that the first thickness of the metal layer 1034 is set to 30nm, the curve where the m-shaped mark is located represents that the first thickness of the metal layer 1034 is 40nm, the curve where the circular blocks are located represents that the first thickness of the metal layer 1034 is 50nm, and the curve where the vertical mark is located represents that the first thickness of the metal layer 1034 is 60nm. In this embodiment, when the first thickness of the metal layer 1034 is set to be greater than 20nm, the redness problem around the display area cannot be reduced, so only the case where the first thickness of the metal layer 1034 is at [0nm,20nm ] will be described hereinafter.
In case 1, when the first thickness of the metal layer 1034 is set to 0nm, in the display area of the display device, the efficiency of Red light (Red) is 100% (see the curve of the diamond in fig. 5), the efficiency of Green light (Green) is 100% (see the curve of the diamond in fig. 6), and the efficiency of Blue light (Blue) is 100% (see the curve of the diamond in fig. 7) in the middle area (i.e., the area corresponding to the second inorganic layer 1044 having a thickness of 920 nm); the Red (Red) efficiency at the edge region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 830 nm) is 98% (see the curve of the diamond in fig. 5), the Green (Green) efficiency is 101.25% (see the curve of the diamond in fig. 6), and the blue efficiency is 101% (see the curve of the diamond in fig. 7), i.e., the Red efficiency at the edge region is reduced by 2% compared to the Red efficiency at the center region, and the Green efficiency at the edge region is slightly increased (not more than 2%) compared to the blue efficiency at the center region. Therefore, the red emitting problem is not presented around the display area in the display device, and the green light efficiency and the blue light efficiency at the edge area are not obviously changed compared with the green light efficiency and the blue light efficiency at the central area, so that the good display effect is achieved around the display area.
In case 2, if the first thickness of the metal layer 1034 is set to 10nm, in the display area of the display device, the efficiency of Red light (Red) is 98.5% (see the curve of the square block in fig. 5), the efficiency of Green light (Green) is 99.75% (see the curve of the square block in fig. 6), and the efficiency of Blue light (Blue) is 100% (see the curve of the square block in fig. 7) in the middle area (i.e., the area corresponding to the second inorganic layer 1044 having a thickness of 920 nm); the Red light (Red) efficiency at the edge region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 830 nm) is 97.5% (see the curve of the square block in fig. 5), the Green light (Green) efficiency is 101.1% (see the curve of the square block in fig. 6), and the blue light efficiency is 100.7% (see the curve of the square block in fig. 7), i.e., the Red light efficiency at the edge region is reduced by 1% compared to the Red light efficiency at the center region, and the Green light efficiency at the edge region is slightly increased (not more than 2%) compared to the blue light efficiency at the center region. Therefore, the red emitting problem is not presented around the display area in the display device, and the green light and blue light around the display area have better display effect because the green light efficiency and blue light efficiency at the edge area and the green light efficiency and blue light efficiency at the central area are not changed obviously.
In case 3, if the first thickness of the metal layer 1034 is set to 20nm, the efficiency of Red light (Red) is 97% (see the curve of the triangle block in fig. 5), the efficiency of Green light (Green) is 99.5% (see the curve of the triangle block in fig. 6), and the efficiency of Blue light (Blue) is 99.8% (see the curve of the triangle block in fig. 7) in the middle region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 920 nm) of the display region of the display device; the Red (Red) efficiency at the edge region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 830 nm) is 97% (see the curve of the triangle block in fig. 5), the Green (Green) efficiency is 100.9% (see the curve of the triangle block in fig. 6), and the blue efficiency is 100.3% (see the curve of the triangle block in fig. 7), i.e., the Red efficiency at the edge region is substantially the same as the Red efficiency at the center region, and the Green efficiency at the edge region is slightly increased (not more than 2%) compared to the blue efficiency at the center region. Therefore, the red emitting problem is not presented around the display area in the display device, and the green light and blue light around the display area have better display effect because the green light efficiency and blue light efficiency at the edge area and the green light efficiency and blue light efficiency at the central area are not changed obviously.
As can be seen from the above embodiment, when the first thickness of the metal layer 1034 is set to 0nm, the Red emitting problem can be avoided around the display area in the display device, and the middle area can be ensured to have high and uniform light efficiency, i.e. the Red (Red), green (Green) and Blue (Blue) efficiencies in the middle area are all 100% (see the curves of the diamond blocks in fig. 5-7, respectively). Thus, in a more preferred embodiment, the first thickness of metal layer 1034 may be set directly to 0nm.
2. The efficiency of the light rays of the respective colors emitted from the display region (i.e., the middle region and the edge region) of the display device based on the thickness variation of the first inorganic layer 105 can be seen in fig. 8 to 10; in fig. 8, the abscissa indicates the thickness of the second inorganic layer 1044 (CVD 1), and the ordinate indicates the efficiency (r_eff) of emitting red light from the display region of the display device when the thickness of the first inorganic layer 105 is changed; in fig. 9, the abscissa indicates the thickness of the second inorganic layer 1044 (CVD 1), and the ordinate indicates the efficiency (g_eff) of emitting green light from the display region of the display device when the thickness of the first inorganic layer 105 is changed; in fig. 10, the abscissa indicates the thickness of the second inorganic layer 1044 (CVD 1), and the ordinate indicates the efficiency (b_eff) of blue light emission from the display region of the display device when the thickness of the first inorganic layer 105 is changed. The thickness of the first inorganic layer 105 is shown in fig. 8-10 as: 0.04um,0.06um and 0.08um, and in order to be able to distinguish the above-mentioned curves, the thickness of the first inorganic layer 105 is set to 0.04um by using the curve of the square block, the thickness of the first inorganic layer 105 is set to 0.06um by using the curve of the circular block, and the thickness of the first inorganic layer 105 is set to 0.08um by using the curve of the triangle block. It should be understood that when the thickness of the second inorganic layer 1044 is changed, the thickness of the metal layer 1034 should be ensured to be unchanged, and the thickness of the metal layer 1034 is set to 0nm.
In case 1, when the thickness of the first inorganic layer 105 is 0.04um, in the display region of the display device, the efficiency of Red light (Red) is 100% (see the curve of the square block in fig. 8), the efficiency of Green light (Green) is 100% (see the curve of the square block in fig. 9), and the efficiency of Blue light (Blue) is 100% (see the curve of the square block in fig. 10) in the middle region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 920 nm); the Red light (Red) efficiency at the edge region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 830 nm) is 96% (see the curve of the square block in fig. 8), the Green light (Green) efficiency is 100.1% (see the curve of the square block in fig. 9), the Blue light (Blue) efficiency is 100.75% (see the curve of the square block in fig. 10), i.e., the Red light efficiency at the edge region is reduced by 4% compared to the Red light efficiency at the center region, and the Green light efficiency at the edge region is slightly increased (not more than 1%) compared to the Blue light efficiency at the center region. Therefore, the red emitting problem is not presented around the display area in the display device, and the green light and blue light around the display area have better display effect because the green light efficiency and blue light efficiency at the edge area and the green light efficiency and blue light efficiency at the central area are not changed obviously.
In case 2, when the thickness of the first inorganic layer 105 is 0.06um, in the display area of the display device, the efficiency of Red light (Red) is 100% (see the curve of the circular block in fig. 8), the efficiency of Green light (Green) is 100% (see the curve of the circular block in fig. 9), and the efficiency of Blue light (Blue) is 100% (see the curve of the circular block in fig. 10) in the middle area (i.e., the area corresponding to the second inorganic layer 1044 having a thickness of 920 nm); the Red (Red) efficiency at the edge region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 830 nm) is 96.5% (see the curve of the circular block in fig. 8), the Green (Green) efficiency is 100.75% (see the curve of the circular block in fig. 9), and the blue efficiency is 101.4% (see the curve of the circular block in fig. 10), i.e., the Red efficiency at the edge region is reduced by 3.5% compared to the Red efficiency at the center region, and the Green efficiency at the edge region is slightly increased (not more than 2%) compared to the blue efficiency at the center region. Therefore, the red emitting problem is not presented around the display area in the display device, and the green light and blue light around the display area have better display effect because the green light efficiency and blue light efficiency at the edge area and the green light efficiency and blue light efficiency at the central area are not changed obviously.
In case 3, when the thickness of the first inorganic layer 105 is 0.08um, the efficiency of Red light (Red) is 100% (see the curve of the triangle block in fig. 8), the efficiency of Green light (Green) is 100% (see the curve of the triangle block in fig. 9), and the efficiency of Blue light (Blue) is 100% (see the curve of the triangle block in fig. 10) in the middle region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 920 nm) of the display region of the display device; the Red light (Red) efficiency at the edge region (i.e., the region corresponding to the second inorganic layer 1044 having a thickness of 830 nm) is 98% (see the curve of the triangle block in fig. 8), the Green light (Green) efficiency is 101.25% (see the curve of the triangle block in fig. 9), and the blue light efficiency is 101.1% (see the curve of the triangle block in fig. 10), i.e., the Red light efficiency at the edge region is reduced by 2% compared to the Red light efficiency at the center region, and the Green light efficiency at the edge region is slightly increased (not more than 2%) compared to the blue light efficiency at the center region. Therefore, the red emitting problem is not presented around the display area in the display device, and the green light and blue light around the display area have better display effect because the green light efficiency and blue light efficiency at the edge area and the green light efficiency and blue light efficiency at the central area are not changed obviously.
As can be seen from the above embodiments, no matter how the thickness of the first inorganic layer 105 changes within the interval of [0.04um,0.08um ], the red light efficiency emitted from the central region of the display region is 100% (see the curve where the square block is located, the curve where the circular block is located, and the curve where the triangle block is located in fig. 8, respectively), when the thickness of the first inorganic layer 105 is set to 0.08um, the red light efficiency emitted from the edge region of the display region is 98% (see the curve where the triangle block is located in fig. 8), at this time, the red light efficiency (98%) emitted from the edge region of the display region is lower than the red light efficiency (100%) emitted from the middle region of the display region, so that the red light emitting problem can be avoided around the display device, and the red light efficiency at the edge region is reduced by only 2% compared with the red light efficiency at the central region (compared with the case where the first inorganic layer 105 is set to 0.04um and 0.06um, the red light efficiency at the edge region is reduced to the minimum when the thickness of the first inorganic layer 105 is set to 0.08 um). Thus, in a more preferred embodiment, the thickness of the first inorganic layer 105 is 0.08um.
Referring to fig. 11 and 12, fig. 11 shows the absorption rate (absorptance) of red light in the display area of the display panel (as shown in fig. 1 and 2) of the conventional structure; fig. 12 shows the red light absorption (absorptance) of the display area of the new display panel (shown in fig. 4). Wherein the thickness of the metal layer 1034 in the new display panel is preferably 0nm; the thickness of the first inorganic layer is preferably 0.08um and the refractive index is 1.47; the thickness of the second inorganic layer 1044 is preferably 0.92um, and the red light is in the wavelength range of [620nm,680nm ].
Specifically, as shown in fig. 11, in the display area of the display device, the absorption rate of red light at the edge area (i.e., the area corresponding to the second inorganic layer 1041 having a thickness of 0.9um in the related art) is 7% -8% (see the solid line in fig. 11), and the absorption rate of red light at the middle area (i.e., the area corresponding to the second inorganic layer 1041 having a thickness of 1um in the related art) is 11% -12% (see the broken line in fig. 11). As shown in fig. 12, in the display region of the display device, the red light absorption rate at the edge region (i.e., the region corresponding to the second inorganic layer 1043 having a thickness of 0.83um in this application) is 15% -16% (see the dotted line in fig. 12), and the red light absorption rate at the middle region (i.e., the region corresponding to the second inorganic layer 1043 having a thickness of 0.92um in this application) is 12% -13% (see the solid line in fig. 12).
It is clear that the absorption rate of red light at the edge area in the display area of the display panel in the present application (15% -16%) is significantly larger than that of red light at the edge area in the display area of the display panel in the related art (7% -8%), while the absorption rate of red light at the middle area is not significantly changed. It will be appreciated that the greater the light absorption, the less the light transmittance, with the total amount of light unchanged. That is, the transmittance of red light at the edge area of the display panel in the application is significantly reduced compared with the prior art, so as to achieve the purpose of reducing reddening around the display area.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the display panel provided by any one of the embodiments of the invention. The display device may be: any product or component having a display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, etc. is not particularly limited herein.
Referring to fig. 13, based on the same inventive concept, an embodiment of the present invention provides a method for manufacturing a display panel, which includes the following steps:
step 201: preparing a driving circuit and an anode structure on a substrate;
step 202: preparing an electroluminescent film layer on a driving circuit, wherein the electroluminescent film layer comprises at least three sub-pixel areas, each sub-pixel emits light with one wavelength, and the thickness of a metal layer in the electroluminescent film layer is a first thickness;
step 203: preparing a first inorganic layer on the electroluminescent film layer based on a plasma vapor deposition method, wherein the thickness range of the first inorganic layer is [0.04um,0.08um ], and the refractive index range is [1.47,1.52];
step 204: forming a second inorganic layer on the first inorganic layer based on a plasma vapor deposition method, wherein the thickness of the second inorganic layer is a second thickness, the refractive index is 1.73, and the sum of the thickness of the first inorganic layer and the second thickness is not more than 1um;
step 205: forming a first organic layer on the second inorganic layer based on an inkjet printing process, the first organic layer having a thickness of [8um,10um ] and a refractive index of 1.53;
step 206: and forming a third inorganic layer on the first organic layer based on a plasma vapor deposition method, wherein the thickness of the third inorganic layer is [0.5um,0.8um ], the refractive index is 1.83, and the second inorganic layer, the first organic layer and the third inorganic layer jointly form a film packaging layer.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims (10)

1. The display panel comprises a substrate base plate, a driving circuit and an electroluminescent film layer which are arranged in a stacked manner, and is characterized by further comprising a first inorganic layer and a film packaging layer; wherein, the liquid crystal display device comprises a liquid crystal display device,
the driving circuit is connected with the electroluminescent film layer and is used for driving the electroluminescent film layer to emit light rays with different wavelengths; the metal layer in the electroluminescent film layer is of a first thickness, the light rays with different wavelengths are emitted into the first inorganic layer through the metal layer, the thickness range of the first inorganic layer is [0.04um,0.08um ], and the refractive index range is [1.47,1.52];
the light emitted from the first inorganic layer is incident into the film packaging layer, wherein the second inorganic layer in the film packaging layer has a second thickness, the refractive index is 1.73, and the sum of the thickness of the first inorganic layer and the second thickness is not more than 1um.
2. The display panel of claim 1, wherein the first inorganic layer has a thickness value of 0.08um.
3. The display panel of claim 1, wherein the first inorganic layer has a refractive index of 1.47.
4. The display panel of claim 1, wherein the second thickness is [0.88um,0.92um ].
5. The display panel of claim 4, wherein the second thickness is 0.92um.
6. The display panel of claim 1, wherein the first thickness is [0nm,20nm ].
7. The display panel of claim 6, wherein the first thickness is 0nm.
8. The display panel of claim 1, wherein the first inorganic layer is silicon oxide.
9. A display device comprising the display panel according to any one of claims 1-8.
10. A method for manufacturing a display panel, the method comprising:
preparing a driving circuit and an anode structure on a substrate;
preparing an electroluminescent film layer on the driving circuit, wherein the electroluminescent film layer comprises at least three sub-pixel areas, each sub-pixel emits light with one wavelength, and the thickness of a metal layer in the electroluminescent film layer is a first thickness;
preparing a first inorganic layer on the electroluminescent film layer based on a plasma vapor deposition method, wherein the thickness of the first inorganic layer ranges from [0.04um,0.08um ], and the refractive index range is [1.47,1.52];
forming a second inorganic layer on the first inorganic layer based on a plasma vapor deposition method, wherein the thickness of the second inorganic layer is a second thickness, and the refractive index is 1.73, and the sum of the thickness of the first inorganic layer and the second thickness is not more than 1um;
forming a first organic layer on the second inorganic layer based on an inkjet printing process, the first organic layer having a thickness of [8um,10um ] and a refractive index of 1.53;
and forming a third inorganic layer on the first organic layer based on a plasma vapor deposition method, wherein the thickness of the third inorganic layer is [0.5um,0.8um ], the refractive index is 1.83, and the second inorganic layer, the first organic layer and the third inorganic layer jointly form a film packaging layer.
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