CN116615069A

CN116615069A - Display panel and display device

Info

Publication number: CN116615069A
Application number: CN202310737404.8A
Authority: CN
Inventors: 曾平川; 祁一歌; 张如芹; 于天成; 姚亮; 李金钰; 吴欢
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd; Beijing BOE Technology Development Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd; Beijing BOE Technology Development Co Ltd
Priority date: 2023-06-20
Filing date: 2023-06-20
Publication date: 2023-08-18

Abstract

The present disclosure provides a display panel and a display device, the display panel including: a back plate including a substrate and a pixel driving circuit layer disposed on the substrate; the light-emitting device layer is arranged on one side of the pixel driving circuit layer, which is far away from the substrate; the packaging layer is arranged on one side, far away from the substrate, of the light-emitting device layer; the color film layer is arranged on one side of the packaging layer, which is far away from the substrate, and comprises a green filter; the cover plate is attached to one side of the color film layer, which is far away from the substrate, through the optical adhesive layer; the protective layer is arranged between the color film layer and the optical adhesive layer, the orthographic projection of the protective layer on the substrate base plate at least covers the green filter, and the protective layer is used for preventing the green filter and the optical adhesive layer from undergoing free radical reaction under the action of ultraviolet light.

Description

Display panel and display device

Technical Field

The disclosure relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

AMOLED (Active-matrix Organic Light-emitting Diode) screen has the advantages of wide color gamut, high resolution, capability of controlling each pixel independently and the like, and the application range of the AMOLED screen in terminals is increasingly enlarged. Especially, the AMOLED large-size panel has higher and higher occupation ratio in the terminal market, such as large-screen mobile phones, notebook computers, vehicle-mounted instrument displays and the like. In order to prevent reflection, the conventional OLED display panel needs to use a Polarizer (POL) in a Module (MDL) stack structure to reduce the reflection intensity of external ambient light on a screen, but the thickness of the Module stack is increased, which is disadvantageous for folding. Therefore, the technology of manufacturing the color filter (Color filter On Encapsulation, COE) on the packaging layer has been developed, the COE structure can effectively improve the transmittance of the display panel, reduce the power consumption of the light emitting device, meanwhile, the thickness of the display panel can be thinner, the attaching difficulty of the display panel is reduced, and the development of folding and curling screens is promoted. However, display panels with the COE structure also have some problems of poor display, and the targeted improvement of these problems of poor display is an important research point for promoting the development of the display panels.

Disclosure of Invention

In a first aspect, embodiments of the present disclosure provide a display panel, including:

a back plate including a substrate base plate and a pixel driving circuit layer disposed on the substrate base plate;

a light emitting device layer disposed on a side of the pixel driving circuit layer away from the substrate;

the packaging layer is arranged on one side, far away from the substrate, of the light-emitting device layer;

the color film layer is arranged on one side, far away from the substrate, of the packaging layer and comprises a green filter;

the cover plate is attached to one side, far away from the substrate, of the color film layer through the optical adhesive layer;

the protective layer is arranged between the color film layer and the optical adhesive layer, orthographic projection of the protective layer on the substrate at least covers the green filter, and the protective layer is configured to prevent free radical reaction between the green filter and the optical adhesive layer under the action of ultraviolet light.

Further, orthographic projection of the protective layer on the substrate base plate covers the whole color film layer; or alternatively, the process may be performed,

the color film layer further comprises: the device comprises a substrate, a protective layer, a red filter, a blue filter and a black matrix arranged between the adjacent filters, wherein the orthographic projection of the green filter on the substrate is positioned in the orthographic projection of the protective layer on the substrate, and the orthographic projections of the red filter and the blue filter on the substrate and the orthographic projection of the protective layer on the substrate are not overlapped with each other.

Further, the protective layer comprises an oxidation-resistant layer, the oxidation-resistant layer is made of transparent organic materials and is configured to capture free radicals formed by the optical adhesive layer under ultraviolet irradiation.

Further, the thickness of the antioxidation layer is 0.5-2 μm.

Further, the material of the oxidation-resistant layer includes: derivatives of aromatic secondary amines.

Further, the protective layer includes: an inorganic barrier layer of transparent inorganic material configured to isolate the optical cement layer from the green filter.

Further, the thickness of the inorganic barrier layer is 0.5-5 μm.

Further, the material of the inorganic barrier layer includes: silicon oxide, silicon oxynitride, and silicon nitride.

Further, the protective layer includes: the anti-oxidation layer is arranged in a stacked mode and is configured to capture free radicals formed by the optical adhesive layer under ultraviolet irradiation, the anti-oxidation layer is made of a transparent organic material, and the inorganic blocking layer is made of a transparent inorganic material;

the inorganic barrier layer is arranged on one side of the color film layer, which is far away from the substrate, and the antioxidation layer is arranged on one side of the inorganic barrier layer, which is far away from the substrate; or the antioxidation layer is arranged on one side of the color film layer, which is far away from the substrate, and the inorganic barrier layer is arranged on one side of the antioxidation layer, which is far away from the substrate.

In a second aspect, embodiments of the present disclosure further provide a display apparatus, including: the display panel provided in the first aspect.

The technical scheme provided in the embodiment of the disclosure has at least the following technical effects or advantages:

according to the display panel and the display device provided by the embodiment of the disclosure, the protective layer at least covering the green filter is additionally arranged between the color film layer and the optical adhesive layer of the display panel, so that the green filter and the optical adhesive layer are prevented from undergoing free radical reaction under the action of ultraviolet light, the reduction of the transmittance of the green filter influenced by ultraviolet irradiation is facilitated, the ultraviolet reliability of the display panel with the COE structure is improved, the problem of poor display caused by the transmittance attenuation of the green filter is facilitated, and a better display effect is realized.

The foregoing description is merely an overview of the technical solutions provided by the embodiments of the present disclosure, and in order to make the technical means of the embodiments of the present disclosure more clear, it may be implemented according to the content of the specification, and in order to make the foregoing and other objects, features and advantages of the embodiments of the present disclosure more understandable, the following detailed description of the embodiments of the present disclosure will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic diagram of an OLED display panel with COE structure;

FIG. 2 is a schematic view of a first exemplary structure of a display panel according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a second exemplary structure of a display panel according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of a third exemplary structure of a display panel according to an embodiment of the present disclosure;

FIG. 5 is a fourth exemplary structural schematic diagram of a display panel according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a display device according to an embodiment of the disclosure.

Detailed Description

Fig. 1 shows a schematic diagram of an OLED display panel using a COE structure. As shown in fig. 1, in the display panel, a red filter R CF, a green filter G CF and a blue filter B CF are disposed on a packaging layer TFE, and the red filter R CF, the green filter G CF and the blue filter BCF are connected to a Glass Cover Glass (CG) through optical cement (Optically Clear Adhesive, OCA).

The inventors have performed an Ultraviolet (UV) aging test on the structure shown in fig. 1, and have found that, after the UV aging test is performed, the screen white picture color shifts (powder) and the screen appearance color in the non-lit state changes. In order to analyze the cause of this phenomenon, the inventors conducted a brightness decay test experiment before and after ultraviolet irradiation on the display panel shown in fig. 1.

The specific experimental process comprises the following steps: selecting four test points in a preset ultraviolet irradiation area on a sample, and testing the brightness of the four test points when a red (R) picture is displayed, the brightness of a green (G) picture is displayed and the brightness of a blue (B) picture is displayed before an ultraviolet irradiation experiment is firstly tested; then, the brightness at the time of displaying the red (R) screen, the brightness at the time of displaying the green (G) screen, and the brightness at the time of displaying the blue (B) screen after the ultraviolet irradiation were retested. Then, for the same test point, the brightness attenuation value when the same color picture is displayed before and after the experiment is calculated, namely, the brightness before the ultraviolet irradiation experiment is subtracted by the brightness after the ultraviolet irradiation experiment. The test results are shown in Table 1. As can be seen from table 1, the luminance decay was lower in the red and blue frames before and after uv irradiation, and was more than 10% in the green frame at each test point within an acceptable variation range.

TABLE 1

The related mechanism research and explanation are carried out on the abnormal condition that the brightness of the green picture is reduced by more than 10% under the ultraviolet irradiation of the OLED display panel with the COE structure. The reason for the above-mentioned abnormality under ultraviolet irradiation is: under ultraviolet irradiation, an optical adhesive (OCA) used in a Module (MDL) stacking structure reacts with a green filter (gcf) in a cone structure material to reduce the transmittance of a film layer, so that abnormal display problems such as offset (powdering) of white picture color, change of appearance color of a non-lighting state screen and the like occur in an OLED screen.

Table 2 shows the full band spectral transmittance contrast of different material stacks for the green band (485-570 nm) before and after UV irradiation.

TABLE 2

As can be seen from table 2, group 1: the stacked structure sample formed by sequentially stacking a Glass substrate (Glass), a green filter (gcf), and a coating layer (OC) has relatively small transmittance variation before and after ultraviolet irradiation, and is basically negligible. Group 2: the stacked structure sample formed by sequentially stacking a Glass substrate (Glass), a green filter (G CF), an optical adhesive (OCA) and a cover plate (CG) has relatively large transmittance change before and after ultraviolet irradiation, which reaches 6%. Group 3: in the stacked structure sample formed by sequentially stacking the Glass substrate (Glass), the green filter (G CF), the coating layer (OC), the optical adhesive (OCA), and the cover plate (CG), the transmittance change before and after ultraviolet irradiation is relatively large although it is reduced as compared with the group 2. Group 4: the stacked structure sample formed by sequentially stacking a Glass substrate (Glass), a green filter (G CF), a coating layer (OC), a silicon nitride layer (SiNx), an optical adhesive (OCA) and a cover plate (CG) has a reduced transmittance change before and after ultraviolet irradiation compared with groups 2 and 3.

The above-described results indicate that the green filter (gcf) in the above-described stacked structure undergoes radical reaction at the interface with the optical adhesive (OCA) under ultraviolet irradiation, causing the green filter (gcf) to fail, resulting in a decrease in green transmittance thereof. In addition, as the coating layer (OC) is an organic matter, electrons can still be transmitted between the organic matters, free radical reaction cannot be prevented, and the problem of abnormal attenuation of the brightness of a green picture after ultraviolet light irradiation cannot be effectively solved by simply adding the coating layer (OC) between the green filter (G CF) and the Optical Cement (OCA); after the SiNx film layer is added, the reduction amplitude of the transmittance is obviously slowed down.

Based on this, the embodiment of the disclosure provides a display panel, by adding a protective layer at least covering a green filter between a color film layer and an optical adhesive layer of the display panel, the green filter and the optical adhesive layer are prevented from undergoing free radical reaction under the action of ultraviolet light, the transmittance reduction range of the green filter affected by ultraviolet irradiation is reduced, thereby being beneficial to improving the ultraviolet reliability of the display panel with a COE structure, improving the poor display such as color cast problem, and realizing better display effect.

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It should be noted that, the term "and/or" appearing herein is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. The term "plurality" as used herein includes two or more than two cases.

Fig. 2 is a schematic diagram of a first exemplary structure of a display panel according to an embodiment of the present disclosure. As shown in fig. 2, the display panel 10 includes: the back plate 110, and the light emitting device layer 120, the packaging layer 130, the color film layer 140, the protective layer 150, the optical adhesive layer 160 and the cover plate 170 which are sequentially arranged on the back plate 110. The cover plate 170 (e.g. a glass cover plate) is attached to the side of the color film layer 140 away from the substrate 100 through the optical adhesive layer 160.

The back plate 110 may include a substrate 100 and a pixel driving circuit layer 101 disposed on the substrate 100. Of course, other structures may be included in the back plate 110, specifically designed according to the needs of the actual product, for example, in some examples, the back plate 110 may further include a fingerprint identification circuit, which is not limited in this embodiment.

For example, the substrate base 100 may be a rigid substrate. The rigid substrate may include, for example, a glass substrate, a PMMA (Polymethyl methacrylate ) substrate, a silicon substrate, or the like. In this case, the display panel 10 may be a rigid display panel.

For another example, the substrate base 100 may be a rigid substrate. May be a flexible substrate. The flexible substrate may include, for example, a PET (Polyethylene Terephthalate ) substrate, a PEN (Polyethylene naphthalate two formic acid glycol ester, polyethylene naphthalate) substrate, a PI (Polyimide) substrate, or the like. In this case, the display panel 10 may be a flexible display panel.

The substrate 100 may have a single-layer structure or a multi-layer structure. For example, the substrate base 100 may include at least one flexible substrate and at least one buffer layer, which are alternately stacked.

The pixel driving circuit layer 101 and the light emitting device layer 120 may together form a plurality of pixel units of the display panel 10. Each pixel unit includes a plurality of sub-pixels. Each sub-pixel may include a light emitting device 121 and a pixel driving circuit for driving the light emitting device 121. Each sub-pixel may display a single color, and for example, each pixel unit includes red, green, and blue sub-pixels, the red sub-pixel may include a red light emitting device to display red, the green sub-pixel may include a green light emitting device to display green, and the blue sub-pixel may include a blue light emitting device to display blue. The brightness (gray scale) of the sub-pixels of different colors in each pixel can be adjusted, and display of a plurality of colors can be realized by color combination and superposition, thereby realizing full-color display of the display panel 10.

The pixel driving circuit layer 101 is used to form a plurality of pixel driving circuits distributed in an array. The pixel driving circuit may include a plurality of electronic components such as transistors and capacitors. For example, the pixel driving circuits may each include three transistors and one capacitor, constituting 3T1C (i.e., one driving transistor, two switching transistors, and one capacitor). It is also possible to include more than three transistors and at least one capacitor, such as 4T1C (i.e., one driving transistor, three switching transistors, and one capacitor), 5T1C (i.e., one driving transistor, four switching transistors, and one capacitor), or 7T1C (i.e., one driving transistor, six switching transistors, and one capacitor), etc. The transistor may be a thin film transistor (Thin Film Transistor, TFT for short), a field effect transistor (metal oxide semiconductor, MOS for short), or other switching devices with the same characteristics.

It is understood that the transistor may include a control electrode, a first electrode, and a second electrode. Wherein the control electrode is a gate of a transistor, one of a source and a drain of a first electrode is a source and a drain of a transistor, and the second electrode is the other of the source and the drain of the transistor. Since the source and drain of a transistor may be symmetrical in structure, the source and drain may be indistinguishable in structure, and the source of the transistor may be referred to as a first pole or a second pole.

For example, the pixel driving circuit layer 101 may include an active layer, a first Gate metal layer (Gate 1), a second Gate metal layer (Gate 2), a first metal wiring layer (SD 1), and a second metal wiring layer (SD 2), which are configured to form transistors, capacitors, and a plurality of signal lines for pixel driving in the pixel driving circuit. For example, the plurality of signal lines may include: the power signal line, the data signal line, the reset signal line, the scan signal line, the enable signal line, the initialization signal line, and the like are specifically referred to in the related art, and will not be described in detail herein. The pixel driving circuit layer 101 may further include an insulating layer that separates the functional layers. It should be noted that the above-listed functional layers of the pixel driving circuit layer 101 are only illustrative, and in other examples, the pixel driving circuit layer 101 may include more or fewer functional layers, for example, may further include more metal wiring layers, which is specifically set according to the needs of the actual product, and this embodiment is not limited thereto.

The light emitting device layer 120 is stacked on a side of the pixel driving circuit layer 101 away from the substrate 100. The light emitting device layer 120 may include: the pixel defining layer 122 and the plurality of light emitting devices 121. The pixel defining layer 122 has a plurality of pixel openings, one defining the position of one light emitting device 121. For example, the light emitting device 121 may be an OLED or a quantum dot organic light emitting diode (Quantum Dot Light Emitting Diodes, QLED) or the like.

Taking an OLED as an example, the light emitting device 121 may include a first electrode, a light emitting layer, and a second electrode sequentially stacked in a direction away from the substrate 100. Of course, the light emitting device 121 may further include at least one of a hole injection layer, a hole transport layer, and an electron blocking layer disposed between the first electrode and the light emitting layer, and at least one of an electron injection layer, an electron transport layer, and a hole blocking layer disposed between the second electrode and the light emitting layer, which is not limited in this embodiment according to actual needs.

For example, the first electrode may be an anode and the second electrode may be a cathode. The anode may have a composite structure formed by sequentially stacking transparent conductive oxide thin films/metal thin films/transparent conductive oxide thin films. The material of the transparent conductive oxide film is, for example, any one of ITO (Indium tin oxide) and IZO (Indium zinc oxide Indium zinc oxide), and the material of the metal film is, for example, any one of gold (Au), silver (Ag), nickel (Ni), and platinum (Pt). For another example, the anode may have a single-layer structure, and the material of the single-layer structure may be ITO, IZO, au, ag, ni, pt.

Each pixel opening exposes a portion of the area of the anode electrode of the corresponding light emitting device 121, and at least a portion of the area of the light emitting layer is located within the corresponding pixel opening and electrically connected to the corresponding anode electrode.

For example, the cathodes of the respective light emitting devices 121 may be electrically connected to each other in a unitary structure. For example, the material of the cathode may be any one of aluminum (Al), silver (Ag), and magnesium (Mg), or any one of a magnesium-silver alloy and an aluminum-lithium alloy.

Further, the encapsulation layer 130 is disposed on a side of the light emitting device layer 120 away from the substrate 100 to protect the light emitting devices 121. In some examples, the display panel 10 may include a first inorganic encapsulation layer 130, an organic encapsulation layer 130, and a second inorganic encapsulation layer 130. For example, the first and second inorganic encapsulation layers 130 and 130 may be fabricated using inorganic materials of nitrides, oxides, oxynitrides, nitrates, carbides, or any combination thereof, and the fabrication process may be a chemical vapor deposition (Chemical Vapor Deposition, CVD) process, such as a plasma enhanced chemical vapor deposition (Plasma Enhanced Chemical Vapor Deposition, PECVD) process. For example, the organic insulating layer may be made of acrylic, hexamethyldisiloxane, polyacrylate, polycarbonate, polystyrene, or other materials, and the preparation process may be an Ink Jet Printing (IJP) process.

Of course, in other examples, other packaging methods may be used, such as inorganic thin film packaging, which is not limited in this embodiment.

The color film layer 140 is disposed on a side of the encapsulation layer 130 away from the substrate 100, and the color film layer 140 may include: the first color filter 141, the second color filter 142, and the third color filter 143. The first color filter 141, the second color filter 142, and the third color filter 143 are color filters of different colors. The first color filter 141, the second color filter 142, and the third color filter 143 may have different thicknesses, respectively, or the same thickness, or two of the thicknesses are the same, and the other thickness is different, which is not limited in this embodiment.

In some examples, adjacent color filters of the color film layer 140 do not overlap each other, and the color film layer 140 further includes a black matrix 144 disposed between the adjacent color filters to absorb ambient light, reduce ambient light reflection of the display panel 10, and realize a dark state of the screen when the screen is off. Of course, in other examples, the first color filter 141 and the second color filter 142 may have a first overlap region, the second color filter 142 and the third color filter 143 may have a second overlap region, and the third color filter 143 and the first color filter 141 may have a third overlap region. When two filters of different colors overlap, the light transmittance of the overlapping area is lower, so that the overlapping area can be used as the black matrix 144, and the first overlapping area, the second overlapping area and the third overlapping area of the display panel 10 can be used as the black matrix 144, so that the effect of shading light is achieved, and the black matrix 144 is not required to be additionally arranged.

For example, the first color filter 141 is a red filter, the second color filter 142 is a green filter, and the third color filter 143 is a blue filter.

The protective layer 150 is disposed between the color film layer 140 and the optical adhesive layer 160. The orthographic projection of the protective layer 150 on the substrate 100 covers at least the green filter in the color film layer 140. The protective layer 150 is configured to prevent the green filter from undergoing radical reaction with the optical cement layer 160 under uv light. The method is favorable for reducing the reduction amplitude of the transmittance of the green filter, which is influenced by ultraviolet irradiation, and improving the ultraviolet reliability of the display panel 10 with the COE structure, so that the problem of poor display such as color cast caused by the attenuation of the transmittance of the green filter is favorably solved, and a better display effect is realized.

It should be noted that, the protective layer 150 may be made of a transparent material, so as to reduce the brightness loss caused by the protective layer 150 itself. For example, the transmittance of the protective layer 150 may be greater than or equal to 90%. Furthermore, in some examples, a side of the color film layer 140 facing away from the substrate 100 may be further provided with a coating layer (OC) to function as a flat layer. At this time, the protective layer 150 may be disposed between the coating layer and the optical cement layer 160.

As shown in fig. 2, in some examples, the protective layer 150 may be disposed entirely, i.e., the front projection of the protective layer 150 onto the substrate 100 covers the entire color film layer 140. In the preparation process, the whole surface of the protective layer 150 can be formed on the color film layer 140 through steps of exposure, development and the like on the basis of the COE process. This is advantageous for simplifying the process steps, improving the flatness of the stacked structure after forming the protection layer 150, and facilitating the subsequent MDL process.

Fig. 3 is a schematic diagram of a second exemplary structure of a display panel according to an embodiment of the disclosure, and fig. 3 is a schematic diagram illustrating a protective layer setting position taking a second color filter 142 as a green filter as an example. As shown in fig. 3, in some examples, the protection layer 150 may also be patterned to cover the green filter, prevent the green filter from undergoing a radical reaction with the optical adhesive layer 160 under the irradiation of ultraviolet light, so as to improve the problem of failure of the green filter caused by the radical reaction, and expose the red light-transmitting region and the blue light-transmitting region in the color film layer 140, so as to avoid the protection layer 150 from affecting the light-emitting efficiency of the red light and the blue light.

For example, in the preparation process, the patterned protective layer 150 may be formed on the color film layer 140 through steps of exposure, development, etc. on the basis of the COE process, so that the protective layer 150 covers the green filter and is opened at a position opposite to the red filter and the blue filter to expose the red filter and the blue filter.

For example, in the case where adjacent color filters of the color film layer 140 do not overlap each other and the black matrix 144 is disposed between the adjacent filters, the orthographic projection of the green filter on the substrate 100 may be located within the orthographic projection of the protective layer 150 on the substrate 100, and the orthographic projections of the red filter and the blue filter on the substrate 100 and the orthographic projection of the protective layer 150 on the substrate 100 may not overlap each other.

It should be noted that the thickness of the protective layer 150 in the direction perpendicular to the substrate 100 may be set according to the process level, the acceptable attenuation amount of the green light transmittance, the arrangement mode of the protective layer 150 (such as the above-mentioned whole-surface arrangement or patterning arrangement), and the thickness specification of the relevant film layer.

Taking the arrangement of the protection layer 150 in fig. 3 as an example, if the thickness d of the green filter is perpendicular to the direction of the substrate 100 _G Less than the thickness d of the red filter _R And/or blue filter d _B The thickness of the protective layer 150 may be equal to max { d } _R ，d _B Thickness d of the green filter _G Difference between them. Wherein max { d } _R ，d _B And d represents _R And d _B Is the maximum value of (a). This is advantageous in reducing the flatness effect. For example, in one application scenario, the thickness d of the red filter _R Thickness d of green filter _G Blue filter d _B The thickness of the protective layer 150 disposed on the green filter may be 1 μm, respectively, to be 3 μm, and 4 μm.

In particular, there are various embodiments of the protective layer 150, and several exemplary embodiments are described below as examples.

First, in the structure shown in fig. 2 and 3, the protective layer 150 may be an anti-oxidation layer configured to capture radicals formed by the optical cement layer 160 under the irradiation of ultraviolet light, and prevent the green filter from reacting with the radicals of the optical cement layer 160 under the action of ultraviolet light by reducing the radicals. In some examples, the oxidation resistant layer is in contact with a side of the optical cement layer 160 adjacent to the color film layer 140 in order to capture radicals generated by the ultraviolet light on a surface of the optical cement layer 160 adjacent to the side of the substrate 100.

In some examples, the thickness of the oxidation resistant layer may be 0.5-2 μm, taking into account the desired radical trapping effect and the effect on the thickness of the display panel 10.

The antioxidation layer is made of transparent organic material. For example, the material of the oxidation resistant layer may include: derivatives of aromatic secondary amines, such as may include, but are not limited to, one or more of secondary diarylamines, para-phenylenediamines, ketoamines, and aldamines, among others.

Second, in the structure shown in fig. 2 and 3, the protective layer 150 may be an inorganic barrier layer configured to separate the optical cement layer 160 from the green filter. The material of the inorganic barrier layer may be a transparent inorganic material, such as may include, but is not limited to, one or more of silicon oxide (SiOx), silicon oxynitride (SiON), and silicon nitride (SiNx). For example, the inorganic barrier layer may be a single film structure made of any one of SiOx, siON, and SiNx, or a stacked structure formed by stacking any two or more of SiOx, siON, and SiNx.

Because the inorganic material can effectively block the transmission of electrons, the addition of the inorganic barrier layer can effectively prevent the free radical reaction between the optical adhesive layer and the green filter.

Considering the barrier effect, the transmittance of the inorganic barrier layer itself, and the overall thickness requirement in combination, the thickness of the inorganic barrier layer may be 0.5 to 5 μm in some examples.

Third, the protective layer 150 may include: the oxidation-resistant layer 151 and the inorganic barrier layer 152 are stacked. Specific embodiments of the oxidation resistant layer 151 and the inorganic barrier layer 152 may be referred to the descriptions of the first and second types, and will not be repeated here.

On the basis of the arrangement of the protective layer 150 shown in fig. 2, as shown in fig. 4, as an embodiment, the inorganic barrier layer 152 is disposed on the side of the color film layer 140 away from the substrate 100, and the oxidation-resistant layer 151 is disposed on the side of the inorganic barrier layer 152 away from the substrate 100. For example, after completing the COE process, the inorganic barrier layer 152 may be deposited on the color film layer 140 through a PECVD deposition process; the oxidation-resistant layer 151 is then deposited over the inorganic barrier layer 152 by exposure, development, etc., and then subjected to a subsequent MDL process.

Alternatively, as shown in fig. 5, the anti-oxidation layer 151 may be disposed on a side of the color film layer 140 away from the substrate 100, and the inorganic barrier layer 152 may be disposed on a side of the anti-oxidation layer 151 away from the substrate 100.

Of course, in other examples, the oxidation preventing layer 151 and/or the inorganic barrier layer 152 may be patterned, for example, to cover the green filter and expose the red filter and the blue filter, which is not limited in this embodiment.

In order to verify the effect of the technical solution provided by the embodiments of the present disclosure, the film layers and the MDL materials in the above several exemplary embodiments are stacked, and 3 groups of test samples are correspondingly obtained. Wherein the structure of test sample 1 comprises: glass substrate (Glass), green filter (G CF), antioxidation layer, optical adhesive layer (OCA) and apron (CG) that the cascade sets up in proper order. The structure of test sample 2 included: glass substrate (Glass), green filter (G CF), inorganic barrier layer, antioxidation layer, optical adhesive layer (OCA) and apron (CG) that the cascade sets up in proper order. The structure of test sample 3 included: glass substrate (Glass), green filter (G CF), antioxidation layer, inorganic barrier layer, optical adhesive layer (OCA) and apron (CG) that the cascade sets up in proper order.

The full-band spectral transmittance of the green light band (485 to 570 nm) before and after ultraviolet irradiation was tested for test samples 1, 2, and 3, respectively, and the test results are shown in table 3.

TABLE 3 Table 3

As can be seen from Table 3, the difference in transmittance of the green light wave bands before and after ultraviolet irradiation is less than 1% after the addition of the antioxidation layer or the antioxidation layer and the inorganic barrier layer. The ultraviolet reliability of the display panel with the COE structure can be improved by preventing the free radical reaction between the green filter and the optical adhesive layer under the ultraviolet condition, so that the problem of abnormal transmittance attenuation of the green filter after ultraviolet irradiation can be effectively solved.

In addition, the embodiment of the disclosure also provides a display device 20. Fig. 6 is a schematic diagram of a display device according to an embodiment of the disclosure. As shown in fig. 6, the display device 20 includes the display panel 10 described above. Thus, the display device 20 has technical effects corresponding to the beneficial technical effects of the display panel 10 described above.

For example, the display device 20 may be any electronic product or component with display function, such as a display screen, a mobile phone, a notebook computer, a tablet computer, a wearable display device (e.g., a smart watch, a smart glasses, etc.), a television, a digital photo frame, etc.

In the above description, technical details such as patterning of the respective layers of the product are not described in detail. Those skilled in the art will appreciate that layers, regions, etc. of the desired shape may be formed by a variety of techniques. In addition, to form the same structure, those skilled in the art can also devise methods that are not exactly the same as those described above. Although the embodiments are described above separately, this does not mean that the measures in the embodiments cannot be used advantageously in combination.

In addition, one of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure is limited to these examples; combinations of features of the above embodiments or in different embodiments are also possible within the spirit of the present disclosure, steps may be implemented in any order, and there are many other variations of the different aspects of one or more embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

While the preferred embodiments of the present disclosure have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the disclosure.

Claims

1. A display panel, comprising:

2. The display panel of claim 1, wherein the orthographic projection of the protective layer on the substrate base plate covers the entire color film layer; or alternatively, the process may be performed,

3. The display panel of claim 1, wherein the protective layer comprises an oxidation resistant layer of a transparent organic material configured to trap radicals formed by the optical glue layer under uv irradiation.

4. A display panel according to claim 3, wherein the thickness of the antioxidation layer is 0.5-2 μm.

5. A display panel according to claim 3, wherein the material of the oxidation resistant layer comprises: derivatives of aromatic secondary amines.

6. The display panel of claim 1, wherein the protective layer comprises: an inorganic barrier layer of transparent inorganic material configured to isolate the optical cement layer from the green filter.

7. The display panel according to claim 6, wherein the inorganic barrier layer has a thickness of 0.5 to 5 μm.

8. The display panel of claim 6, wherein the material of the inorganic barrier layer comprises: silicon oxide, silicon oxynitride, and silicon nitride.

9. The display panel of claim 1, wherein the protective layer comprises: the anti-oxidation layer is arranged in a stacked mode and is configured to capture free radicals formed by the optical adhesive layer under ultraviolet irradiation, the anti-oxidation layer is made of a transparent organic material, and the inorganic blocking layer is made of a transparent inorganic material;

10. A display device, comprising: the display panel of any one of claims 1-9.