CN113328048B - Display panel, display device, mask and manufacturing method of display panel - Google Patents

Display panel, display device, mask and manufacturing method of display panel Download PDF

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Publication number
CN113328048B
CN113328048B CN202010130442.3A CN202010130442A CN113328048B CN 113328048 B CN113328048 B CN 113328048B CN 202010130442 A CN202010130442 A CN 202010130442A CN 113328048 B CN113328048 B CN 113328048B
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layer
display panel
area
cathode
light
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CN113328048A (en
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关彦涛
冯士振
杨泽明
刘明星
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics 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
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/822—Cathodes characterised by their shape
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/04—Coating on selected surface areas, e.g. using masks
    • C23C14/042—Coating on selected surface areas, e.g. using masks using masks
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/24—Vacuum evaporation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • 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
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • 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
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/1201—Manufacture or treatment
    • 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
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • 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
    • 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
    • H10K71/60—Forming conductive regions or layers, e.g. electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention belongs to the technical field of display panels, and particularly relates to a display panel, a manufacturing method, a display device and a mask, wherein the display panel comprises a plane part and a bent part; the bending part is positioned on the side edge of the plane part and connected with the plane part; the plane part and the bending part respectively comprise a pixel defining layer, a light emitting unit layer, an anode layer and a cathode layer, and the pixel defining layer is provided with pixel openings which are arranged in an array; the light-emitting unit layers are arranged in the pixel openings, the light-emitting unit layers are located between the anode layers and the cathode layers, the cathode layers located at the bent portions are provided with hollow areas between the corresponding adjacent pixel openings, so that no cathode shielding light-emitting areas are formed, and the color cast phenomenon of the bent portions of the display panel can be effectively improved.

Description

Display panel, display device, mask and manufacturing method of display panel
Technical Field
The invention relates to the technical field of display panels, in particular to a display panel, a display device, a mask and a manufacturing method of the display panel.
Background
The OLED (Organic Light-Emitting Diode) display technology has the characteristics of being Light and thin, low in power consumption, high in contrast, high in color gamut, capable of realizing flexible display, and the like, and thus gradually becomes a main development direction of the flat panel display technology.
With the gradual maturity of flexible display technology, a plurality of statically bent display panels appear in the market, however, the bent display panels have different viewing angles, which causes a plurality of technical problems, especially, the statically bent display panels which are not on the same plane have color cast under an oblique viewing angle, which is especially prominent, and is a problem to be solved urgently in the OLED display panel.
Disclosure of Invention
In view of this, the present invention provides a display panel, a manufacturing method, a display device and a mask, which can improve the color cast of a static bending display panel.
In order to solve the technical problems, the invention adopts a technical scheme that: a display panel is provided, which includes a flat portion and a curved portion; the bending part is positioned on the side of the plane part and connected with the plane part; the plane part and the bending part respectively comprise a pixel definition layer, a light-emitting unit layer, an anode layer and a cathode layer, and the pixel definition layer is provided with pixel openings which are arranged in an array; the light emitting unit layer is arranged in the pixel opening, the light emitting unit layer is located between the anode layer and the cathode layer, and the cathode layer located on the bending portion is provided with a hollow area between the corresponding adjacent pixel openings so as to form a non-cathode shading light emitting area.
The display panel is a static bending display panel and comprises a plane part and a bending part, wherein a hollow-out area is arranged in a cathode layer area between adjacent pixel openings of the bending part of the display panel, part of light emitted by a light emitting unit layer can be directly emitted from the hollow-out area of the cathode layer, and the light emitted from a non-cathode shielding light emitting area formed by the hollow-out area is approximately lambertian to emit light, so that the color cast of the bending part caused by the microcavity effect of the bending part of the display panel can be improved.
Wherein the cathode layer is of an integrated structure. The cathode layers are connected into a whole, so that the cathode layers are electrically connected with each other and do not influence the transmission of electric signals.
Wherein an area of an orthographic projection of the hollowed-out area on the anode layer is 10% -50% of an area of an orthographic projection of the cathode layer on the anode layer and located on the bent portion. By setting the area ratio in this range, it is possible to improve the color shift of the bent portion and increase the light intensity of the bent portion.
The hollow areas of the cathode layer are a plurality of, and the areas of the hollow areas are sequentially increased along the direction far away from the plane portion. The area of the hollow area can be adjusted according to the color cast of different degrees, so that the brightness of the plane part and the bent part of the display panel is uniform, and the color cast of the bent part is reduced.
The pixel definition layer is made of a transparent material or a semi-transparent material. When the light emitted by the light emitting unit layer reaches the hollow area through the pixel definition layer made of the light-transmitting material or the semi-light-transmitting material, part or all of the light can pass through the pixel definition layer, and the light is not absorbed by the pixel definition layer or is not absorbed by the pixel definition layer, so that the light emitted by the light emitting unit layer is stronger and the luminous flux is larger through the light emitted by the hollow area of the cathode layer.
The invention also comprises a second technical scheme, and a display device comprises the display panel. The display panel comprises a plane part and a bent part, and the cathode layer corresponding to the bent part area is provided with a hollow area between the corresponding adjacent pixel openings to form a non-cathode shading light-emitting area, so that the visual color cast under the oblique angle is improved, and the display quality of the display device is improved.
The invention also comprises a third technical scheme, namely a mask plate which is used for evaporating the cathode layer of the display panel, wherein the mask plate comprises a common area and a precise area, and the common area is provided with a first opening area; the accurate district has a plurality of second opening area and shielding part, and a plurality of second opening area and shielding part are located the side in first opening area, and wherein, display panel includes plane portion and the flexion that is located the plane portion side, and the shielding part is used for making the cathode layer that is located the flexion form no cathode and shelters from out the light zone. The mask plate adopted by the invention is formed by combining the common area and the precise area on the same mask plate, so that the cathode layer with the hollow area can be directly formed by one-step evaporation through the mask plate, and the requirements of the plane part and the bending part of the display panel on different graphics of the cathode layer are met. Saving the manufacturing steps, reducing the manufacturing time and improving the efficiency.
Wherein the first opening area and the second opening area are connected into a whole, so that the cathode layer is of an integrated structure. The plane part of the display panel is connected with the cathode layer corresponding to the bending part into a whole, so that the cathode layers are mutually and electrically connected, and the transmission of electric signals is facilitated.
Wherein the area of the shielding part is sequentially increased along the direction far away from the first opening area. The shielding parts of the mask are arranged in a differentiated mode so as to solve the problem of different color cast caused by different oblique viewing angles after the static bending display panel is bent.
The invention also comprises a fourth technical scheme, and the manufacturing method of the display panel comprises the steps of manufacturing a pixel definition layer on one side of the anode layer, wherein pixel openings which are arranged in an array are formed on the pixel definition layer; manufacturing a light emitting unit layer in the pixel opening; utilize the mask version to define the layer and send out the coating by vaporization cathode layer in pixel one side of unit layer, wherein, display panel includes plane portion and the flexion that is located the plane portion side, and the cathode layer that is located the flexion has the fretwork region between corresponding adjacent pixel opening to form no cathode and shelter from the light-emitting area, the flexion is connected with plane portion. According to the manufacturing method of the display panel, the cathode layer with the hollowed-out area can be directly evaporated on the display panel, and the area of the hollowed-out area between the adjacent pixel openings can be controlled, so that the manufactured display panel can form a static bending display panel, the color cast of the bending part of the static bending display panel is improved, and the color cast phenomenon of the display panel is reduced.
The invention has the beneficial effects that: different from the prior art, the display panel provided by the invention is a static bending display panel, and comprises a plane part and a bending part, wherein part of light emitted by a light emitting unit layer can be directly emitted from the hollow area of a cathode layer by hollowing out the cathode layer area between adjacent pixel openings of the bending part of the display panel, and the light emitted from a non-cathode shielding light emitting area formed by the hollow area is similar to lambertian body to emit light, so that the color cast of the bending part caused by the microcavity effect of the bending part of the display panel can be improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a display panel according to the present invention;
FIG. 2 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a mask used in the display panel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another embodiment of a mask used in the display panel of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
An embodiment of the invention provides a display panel, as shown in fig. 1, which is a schematic diagram of a display panel after a static bending display panel is formed; fig. 2 is a schematic structural diagram of a display panel, which is bent after being manufactured to form the static bending display panel shown in fig. 1. The display panel comprises a plane part 1 and a bending part 2; the bending part 2 is positioned on the side of the plane part 1 and is connected with the plane part 1; the plane part 1 and the bending part 2 respectively comprise a pixel defining layer 4, a light-emitting unit layer 5, an anode layer 6 and a cathode layer 7, and the pixel defining layer 4 is provided with pixel openings which are arranged in an array; the light emitting unit layer 5 is arranged in the pixel opening, the light emitting unit layer 5 is positioned between the anode layer 6 and the cathode layer 7, and the cathode layer 7 positioned on the bending part 2 is provided with a hollow area between the corresponding adjacent pixel openings so as to form a non-cathode shading light emitting area and improve color cast.
The flexible display panel of the embodiment of the invention can form a static bending display panel, and the side edge of the display panel can form a bending part 2. When the length of the microcavity and the wavelength of the light wave satisfy a certain relationship, light with a specific wavelength (the wavelength of a certain monochromatic light) can be enhanced, the spectrum is narrowed, a microcavity effect occurs, the microcavity effect has the functions of selecting, narrowing, enhancing and the like on the light source of the light emitting unit layer 5, and the microcavity effect is commonly used for improving the chromaticity of the display panel, enhancing the emission intensity of the specific wavelength and changing the light emitting color of the display panel; the microcavity effect includes two interference modes, namely wide-angle interference and multi-beam interference, wherein the wide-angle interference affects visual shift during the period, a luminous peak shifts, and the problems of brightness difference, chromaticity shift and the like are caused. When the eye screen is vertical, it can be understood as a front view, the flat portion 1 of the display panel can be regarded as a front view, and the curved portion 2 of the display panel can easily form an oblique view. In this case, the color shift of the curved portion 2 of the display panel is severe.
According to the display panel provided by the embodiment of the invention, the cathode layer 7 area between the adjacent pixel openings of the bending part 2 of the display panel is hollowed, so that part of light emitted by the light emitting unit layer 5 can be directly emitted from the hollowed area 71 of the cathode layer 7, and the light emitted from the non-cathode shading light emitting area formed by the hollowed area 71 is approximately lambertian to emit light, so that the color cast caused by the microcavity effect of the bending part 2 of the display panel can be improved. In the display panel of the embodiment of the invention, the hollow-out area 71 is arranged on the cathode layer 7, so that light can be emitted from the hollow-out non-cathode shading light emitting area, and the intensity and the luminous flux of the light emitted from the cathode layer 7 can be increased.
It is understood that the display panel according to the embodiment of the present invention may further include an array substrate 8 and an encapsulation layer (not shown), where the array substrate 8 includes a substrate and a pixel circuit array; the packaging layer comprises an inorganic thin film packaging layer and an organic thin film packaging layer which are stacked. The specific structures and materials of the array substrate 8 and the encapsulation layer are not limited in the invention, and can be set according to the display mode of the display panel.
Preferably, the cathode layer 7 is of unitary construction. In the embodiment of the present invention, a part of the area between adjacent pixel openings is hollowed out, so that light can be emitted from the hollowed-out area 71, and the cathode layers 7 on the light emitting unit layers 5 of the pixel openings and the cathode layers 7 on the pixel defining layer 4 between two pixel openings are connected into a whole, so that the cathode layers 7 are electrically connected to each other, and transmission of an electrical signal is not affected.
Wherein, the area of the orthographic projection of the hollow area 71 on the anode layer 6 is 10% -50% of the area of the orthographic projection of the cathode layer 7 on the anode layer 6 at the bending part 2. The hollow area 71 is not too large, otherwise, the normal display effect is influenced, the hollow area 71 is not too small, otherwise, the effective effect cannot be generated, the area of the hollow area 71 accounts for 10% -50% of the area of the cathode layer 7, the visual color cast under the oblique angle can be effectively improved, and the display effect of the display panel is improved.
The light emitted from the light emitting unit layer 5 is obliquely emitted toward the non-cathode-shielded light emitting region and toward the cathode layer 7. The display panel of the embodiment of the invention is a top emission display panel, the light of the light-emitting unit layer 5 forms a set of emergent light formed along the cathode layer 7 microcavity effect and emergent light shielded along the non-cathode light-emitting region, and the light observed by human eyes can improve the color cast of the bending part 2 and increase the light intensity and luminous flux of the bending part 2.
In the display panel according to the embodiment of the present invention, the bending portions 2 are located on both sides of the planar portion 1, the bending portions 2 and the planar portion 1 are integrated, the bending portions 2 located on both sides of the planar portion 1 are preferably bent toward the same side, and in other embodiments, the bending portions 2 may be bent toward opposite sides of the planar portion 1.
In order to improve the degree of color cast of the bent portion 2, the number of the hollow areas 71 of the cathode layer 7 in the embodiment of the present invention is several, and the areas of the hollow areas 71 are sequentially increased along the direction away from the planar portion 1, specifically, two hollow areas 71 are located on one side of the planar portion 1 as shown in fig. 2, and are sequentially a first hollow area 711 and a second hollow area 712 along the direction away from the planar portion 1, where the area of the second hollow area 712 is greater than the area of the first hollow area 711; in other embodiments, the number of the hollow areas 71 may be multiple. The area of the control hollow area 71 can be adjusted according to the color cast of different degrees, so that the brightness of the plane part 1 and the bending part 2 of the display panel is uniform, and the color cast of the bending part 2 is reduced. In other embodiments, when the bending angle of the bending portion 2 changes and the inclination angle of the human eye to the bending portion 2 changes non-gradually, the hollow area 71 away from the planar portion 1 may gradually increase with the increase of the squint angle.
It will be appreciated that the size of the cathode layer 7 at the extreme edge of the bend 2 cannot be smaller than the size of the pixel aperture.
Wherein, the cathode layer 7 is usually deposited on the light-emitting unit layer 5 and the pixel defining layer 4 by evaporation on one side of the pixel defining layer 4, and when the light of the light-emitting unit layer 5 located in the pixel opening is emitted to the hollow area 71 of the cathode layer 7, the light easily passes through the pixel defining layer 4, in order to avoid or improve the phenomenon that the light is absorbed by the pixel defining layer 4 in a large amount and the light-emitting effect of the light from the hollow area 71 is affected, the pixel defining layer 4 of the embodiment of the present invention is a semi-transparent material, such as a magnesium-silver alloy (the ratio of magnesium to silver is 1: 9), and the phenomenon that the light-emitting effect of the non-cathode-shielded light-emitting area is poor and the color shift is not significantly improved due to the fact that the light passing through the pixel defining layer 4 is completely absorbed by using different light materials is avoided, so that when the display panel of the embodiment of the present invention passes through the pixel defining layer 4 made of the semi-transparent material, a part of the light can pass through the pixel defining layer 4 and be emitted along the hollow area 71, thereby achieving the purpose of improving the color cast of the bending part 2. In other embodiments, the pixel defining layer 4 may also be made of a light-transmissive material, such as ITO (indium tin oxide), so that when the light emitted from the light-emitting unit layer 5 passes through the pixel defining layer 4 made of the light-transmissive material, the light absorbed by the pixel defining layer 4 is very little or negligible, and the light emitted from the light-emitting unit layer 5 passes through the hollow area 71 of the cathode layer 7, so as to have strong light and large luminous flux.
The present invention further includes a second technical solution, and a display device includes the above display panel, so that the display device includes all technical features of the above display panel, the display panel includes a planar portion 1 and a curved portion 2, and a hollow area is formed between adjacent pixel openings of the cathode layer 7 corresponding to the area of the curved portion 2, so as to form a non-cathode light-exiting area, so as to improve visual color cast at an oblique viewing angle, and improve display quality of the display device.
The present invention further includes a third technical solution, as shown in fig. 3, a mask 9 for evaporation of the cathode layer 7 (see fig. 2) of the display panel, including a common region 91 and a precise region 92, the common region 91 forming a first opening region 911; the precision region 92 forms a plurality of second opening regions 922 and a shielding portion 921, the plurality of second opening regions 922 and the shielding portion 921 are located on the side of the first opening region 911, the display panel includes a planar portion 1 and a bending portion 2 located on the side of the planar portion 1, and the shielding portion 921 is used for being placed on the pixel definition layer 4 between adjacent pixel openings of the display panel, so that the cathode layer 7 located on the bending portion 2 on the side of the planar portion 1 of the display panel forms a hollow region 71.
The mask 9 of the invention combines the common region 91 and the precise region 92 on the same mask 9, so that the cathode layer 7 with a hollow structure can be directly evaporated by one step by adopting the mask 9, and the requirements of the plane part 1 and the bending part 2 of the display panel on different graphics of the cathode layer 7 are met. The planar portion 1 of the display panel may correspond to one first opening region 911. As shown in fig. 3, the mask 9 corresponds to one first opening area 911 in an area of one display panel, the shielding portion 921 and the second opening area 922 are respectively located at two sides of the first opening area 911, the shielding portion 921 is located at two sides of the first opening area 911, and the shielding portions 921 are respectively two rows.
In the embodiment of the present invention, the first opening region 911 and the second opening region 922 of the mask 9 are connected into a whole, so that the cathode layer 7 manufactured by using the mask 9 is an integrated structure. That is, the flat surface 1 of the display panel is integrally connected to the cathode layer 7 corresponding to the bent portion 2, so that the cathode layers 7 are electrically connected to each other for transmission of electrical signals.
Wherein, the areas of the shielding portions 921 sequentially increase in a direction away from the first opening region 911. As shown in fig. 3, the shielding portions 921 are disposed at two sides of the first opening area 911 at intervals in an array manner, so that the second opening areas 922 are connected to each other as a whole, and the first opening area 911 and the second opening area 922 are connected as a whole, in the embodiment of the present invention, the shielding portion 921 located at one side of the first opening area 911 is respectively a first shielding portion 9211 and a second shielding portion 9212 along a direction away from the first opening area 911, wherein the area of the first shielding portion 9211 is smaller than that of the second shielding portion 9212, the first shielding portion 9211 and the second shielding portion 9212 correspond to the hollow area 71 of the cathode layer 7, and the first opening area 911 and the second opening area 921 correspond to the cathode layer 7 connected as a whole. In another embodiment, as shown in fig. 4, the shielding portions 921 are integrally connected, wherein the second opening region 922 is formed by a plurality of sub openings arranged in an array, the sub openings are integrally connected, and the first opening region 911 is integrally connected, wherein the area of the first sub opening 9221 is larger than the area of the second sub opening 9222, the area of the second sub opening 9222 is larger than the area of the third sub opening 9223, the area between the first sub opening 9221 and the second sub opening 9222 is a first shielding portion 9211, the area between the second sub opening 9222 and the third sub opening 9223 is a second shielding portion 9212, and the area of the first shielding portion 9211 is smaller than the area of the second shielding portion 9212. The size of the shielding portion 921 of the mask 9 is set differently, so as to improve the problem of different color shifts caused by different oblique viewing angles of the bending portion 2 of the static bending display panel, in the embodiment of the present invention, the shielding portion 921 is gradually increased along the direction away from the first opening, so that the hollow area 71 of the formed cathode layer 7 is gradually increased, that is, the hollow area 71 of the cathode layer 7 located between two adjacent pixel openings is gradually increased, the light flux of light emitted along the hollow area 71 is increased, and the problem of gradually increased polarization phenomenon caused by the gradually increased oblique viewing angle of the bending portion 2 along the direction away from the planar portion 1 is improved.
The present invention further includes a fourth technical solution, as shown in fig. 2, a method for manufacturing a display panel, including:
step one, a pixel defining layer 4 is manufactured on one side of an anode layer 6, and pixel openings arranged in an array are formed on the pixel defining layer 4.
In the embodiment of the present invention, the anode layer 6 may be obtained by evaporation on the array substrate 8. The pixel defining layer 4 is formed by vapor deposition on the anode layer 6 side on the array substrate 8, and a pixel opening is formed in the pixel defining layer 4 by a photomask process.
Step two, manufacturing a light-emitting unit layer 5 in the pixel opening.
In the embodiment of the present invention, the light emitting unit layers 5 are sequentially formed on the anode layer 6 of the pixel opening through a fine mask.
And thirdly, manufacturing a cathode layer 7 on one side of the pixel definition layer 4 and the light emitting unit layer 5 by using a mask 9, wherein the display panel comprises a plane part 1 and a bent part 2 positioned on the side of the plane part 1, the cathode layer 7 positioned on the bent part 2 of the display panel is provided with a hollow area between corresponding adjacent pixel openings, and the bent part 2 is connected with the plane part 1.
In the embodiment of the present invention, the mask 9 of the above embodiment shown in fig. 3 or fig. 4 is used in the third step, and the cathode layer 7 is formed on the planar portion 1 and the curved portion 2 of the display panel by one-time evaporation. The first opening area 911 of the mask 9 corresponds to the flat portion 1 of the display panel, the second opening area 921 corresponds to the curved portion 2 of the display panel, and the shielding portion 9 corresponds to the area between adjacent pixel openings in the curved portion 2 of the display panel.
In another embodiment, in the third step, a cathode layer 7 may be deposited on the anode layer 6 and the pixel defining layer 4 corresponding to the flat portion 1 of the display panel by using a common mask (CMM), a cathode layer 7 may be deposited on the anode layer 6 and the pixel defining layer 4 corresponding to the curved portion 2 of the display panel by using a fine mask (FMM), and the cathode layer 7 of the display panel may be obtained by using two deposition processes.
According to the manufacturing method of the display panel, the cathode layer 7 with the hollow structure can be directly evaporated on the display panel, and the area of the hollow area 71 between the adjacent pixel openings can be controlled, so that the manufactured display panel can form a static bending display panel, the color cast of the bending part 2 of the static bending display panel is improved, and the color cast phenomenon of the display panel is reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A display panel, comprising:
a planar portion;
a curved portion located on a side of the planar portion and connected to the planar portion;
the planar part and the bending part respectively comprise a pixel definition layer, a light-emitting unit layer, an anode layer and a cathode layer, and the pixel definition layer is provided with pixel openings which are arranged in an array;
the light emitting unit layer is arranged in the pixel opening, the light emitting unit layer is positioned between the anode layer and the cathode layer, and the cathode layer positioned at the bent part is provided with a hollow area between the corresponding adjacent pixel openings so as to form a non-cathode shading light emitting area.
2. The display panel of claim 1, wherein the cathode layer is a unitary structure.
3. The display panel according to claim 1, wherein an area of an orthographic projection of the hollowed-out area on the anode layer is 10% to 50% of an area of an orthographic projection of the cathode layer on the anode layer at the bent portion.
4. The display panel according to claim 1, wherein the number of the hollow areas of the cathode layer is several, and the areas of the hollow areas increase sequentially in a direction away from the planar portion.
5. The display panel of claim 1, wherein the pixel definition layer is a transparent material or a semi-transparent material.
6. A display device characterized by comprising the display panel according to any one of claims 1 to 5.
7. A mask for evaporation of a cathode layer of a display panel according to any of claims 1 to 5, the mask comprising a common region and a precision region, the common region having a first open region;
the precise area is provided with a plurality of second opening areas and shielding parts, and the second opening areas and the shielding parts are positioned on the side edge of the first opening area;
the display panel comprises a plane part and a bent part positioned on the side of the plane part, and the shielding part is used for enabling the cathode layer positioned on the bent part to form a cathode-free shielding light emergent area.
8. The reticle of claim 7, wherein the first open area and the second open area are integrally connected such that the cathode layer is a unitary structure.
9. A reticle according to claim 8, wherein the areas of the shielding portions increase sequentially in a direction away from the first open area.
10. A method for manufacturing a display panel is characterized in that,
manufacturing a pixel definition layer on one side of the anode layer, wherein pixel openings arranged in an array manner are formed on the pixel definition layer;
manufacturing a light emitting unit layer in the pixel opening;
and evaporating a cathode layer on one side of the pixel defining layer and one side of the light emitting unit layer by using a mask, wherein the display panel comprises a plane part and a bent part positioned on the side of the plane part, the cathode layer positioned on the bent part is provided with a hollow-out area between the corresponding adjacent pixel openings so as to form a non-cathode shielding light-emitting area, and the bent part is connected with the plane part.
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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN108550713A (en) * 2018-04-28 2018-09-18 上海天马有机发光显示技术有限公司 Organic light emitting display panel and its display device
CN109560117A (en) * 2018-12-21 2019-04-02 合肥鑫晟光电科技有限公司 A kind of array substrate and preparation method thereof, display device
CN110349993A (en) * 2018-04-02 2019-10-18 上海和辉光电有限公司 A kind of transparent display panel, mask plate and display device

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN110349993A (en) * 2018-04-02 2019-10-18 上海和辉光电有限公司 A kind of transparent display panel, mask plate and display device
CN108550713A (en) * 2018-04-28 2018-09-18 上海天马有机发光显示技术有限公司 Organic light emitting display panel and its display device
CN109560117A (en) * 2018-12-21 2019-04-02 合肥鑫晟光电科技有限公司 A kind of array substrate and preparation method thereof, display device

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