CN112038384B - Display panel, manufacturing method thereof and display device - Google Patents

Display panel, manufacturing method thereof and display device Download PDF

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Publication number
CN112038384B
CN112038384B CN202010963902.0A CN202010963902A CN112038384B CN 112038384 B CN112038384 B CN 112038384B CN 202010963902 A CN202010963902 A CN 202010963902A CN 112038384 B CN112038384 B CN 112038384B
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light
layer
substrate
green
red
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CN112038384A (en
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李�杰
黄灿
侯鹏
张伟
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BOE Technology Group Co Ltd
Chongqing BOE Display Technology Co Ltd
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BOE Technology Group Co Ltd
Chongqing BOE Display 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
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • 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
    • H10K50/841—Self-supporting sealing arrangements
    • 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
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • 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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • 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

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention provides a display panel, a manufacturing method thereof and a display device, and relates to the technical field of display. The display panel comprises a display substrate and a packaging cover plate which are arranged in a stacked mode; the display substrate comprises a substrate, and a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit which are arranged on the substrate in an array manner; the packaging cover plate comprises a red color resistance layer, a green color resistance layer and a blue color resistance layer which are sequentially stacked; the red color resist layer is adjacent to the display substrate. The red color resistance layer, the green color resistance layer and the blue color resistance layer respectively comprise a color film part, a first light transmission part, a second light transmission part and a shading part which are not overlapped with each other. The invention is suitable for manufacturing the display panel.

Description

Display panel, manufacturing method thereof and display device
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a manufacturing method thereof and a display device.
Background
The Color film on Encapsulation (Color filter on Encapsulation) technology is a new technology currently applied to an Organic Light-emitting Diode (OLED) display device. Referring to fig. 1, a red color film layer 1, a green color film layer 2, a blue color film layer 3, and a black matrix 4 of the COE display panel are integrated in a package cover plate 300, so as to replace an externally-attached polarizing Plate (POL), thereby significantly reducing the thickness of the display panel and saving a large amount of production cost for enterprises.
However, since the process of the COE technology is not mature, the display products related to the COE technology have the problems of the green color of the large-viewing-angle picture, the unclear display picture caused by high reflectivity and the like. At present, it is necessary to design a new display panel to solve the above problems.
Disclosure of Invention
Embodiments of the present invention provide a display panel, a manufacturing method thereof, and a display device, where the display panel can solve the problem of unclear display images due to a bluish color and a high reflectivity of a large-viewing-angle image, thereby improving a display effect.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in one aspect, a display panel is provided, which includes a display substrate and an encapsulation cover plate stacked together; the display substrate comprises a substrate, and a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit which are arranged on the substrate in an array manner; the packaging cover plate comprises a red color resistance layer, a green color resistance layer and a blue color resistance layer which are sequentially stacked; the red color resist layer is adjacent to the display substrate.
The red color resistance layer, the green color resistance layer and the blue color resistance layer respectively comprise a color film part, a first light transmission part, a second light transmission part and a shading part which are not overlapped with each other.
Orthographic projections of the color film parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer on the substrate respectively cover orthographic projections of the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit on the substrate; the light shielding parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer are all positioned in the areas except the color film parts, the first light transmission parts and the second light transmission parts.
Wherein an orthographic projection of the red light emitting unit on the substrate is positioned within an overlapping area of an orthographic projection of the first light transmitting portion of the green color resist layer on the substrate and an orthographic projection of the first light transmitting portion of the blue color resist layer on the substrate; the orthographic projection of the green light-emitting unit on the substrate is positioned within the overlapping area of the orthographic projection of the first light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the blue color resistance layer on the substrate; the orthographic projection of the blue light-emitting unit on the substrate is positioned within the overlapping area of the orthographic projection of the second light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the green color resistance layer on the substrate.
Optionally, in the red color resist layer, the green color resist layer, and the blue color resist layer, the color film portion included in each color resist layer is the same as the light-shielding portion in material.
Optionally, the package cover further includes a first flat layer, a second flat layer, and a third flat layer.
Wherein the first flat layer covers the red color resist layer; the second flat layer covers the green color resistance layer; the third flat layer covers the blue color resistance layer; the first flat layer, the second flat layer and the third flat layer are made of the same light-transmitting material.
Optionally, the thicknesses of the first flat layer, the second flat layer and the third flat layer along the direction perpendicular to the substrate are all in the range of 2-6um.
Optionally, a material of all the first light-transmitting portions and all the second light-transmitting portions is the same as a material of the first flat layer.
Optionally, an orthographic projection of the first light-transmitting portion of the green color resistance layer on the substrate and an orthographic projection of the first light-transmitting portion of the blue color resistance layer on the substrate completely overlap; an orthographic projection of the first light-transmitting portion of the red color-resisting layer on the substrate and an orthographic projection of the second light-transmitting portion of the blue color-resisting layer on the substrate are completely overlapped; an orthographic projection of the second light-transmitting portion of the red color resistance layer on the substrate and an orthographic projection of the second light-transmitting portion of the green color resistance layer on the substrate are completely overlapped.
Optionally, an orthographic projection of the first light-transmitting portion of the green color-resisting layer on the substrate is located within an orthographic projection of the first light-transmitting portion of the blue color-resisting layer on the substrate; the orthographic projection of the second light-transmitting part of the green color resistance layer on the substrate is positioned within the orthographic projection of the second light-transmitting part of the red color resistance layer on the substrate.
In another aspect, a display device is provided, which includes the display panel as described above.
In another aspect, a method for manufacturing a display panel is provided, where the method includes:
a substrate is provided.
A display substrate is formed over the substrate.
An encapsulating cover is formed over the display substrate.
The forming a display substrate includes:
and forming a red light emitting unit, a green light emitting unit and a blue light emitting unit which are arranged in an array.
The forming of the package cover plate includes:
sequentially forming a red color resistance layer, a green color resistance layer and a blue color resistance layer; the red color resist layer is adjacent to the display substrate.
Optionally, before the forming the green color resist layer and after the forming the red color resist layer, the forming the package cover plate further includes:
forming a first flat layer;
before the forming the blue color resist layer and after the forming the green color resist layer, the forming the package cover plate further includes:
forming a second flat layer;
after the forming the blue color resist layer, the forming the package cover plate further includes:
a third flat layer is formed.
The embodiment of the invention provides a display panel, a manufacturing method thereof and a display device, wherein the display panel comprises a display substrate and a packaging cover plate which are arranged in a stacked mode; the display substrate comprises a substrate, and a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit which are arranged on the substrate in an array manner; the packaging cover plate comprises a red color resistance layer, a green color resistance layer and a blue color resistance layer which are sequentially stacked; the red color resistance layer is close to the display substrate; the red color resistance layer, the green color resistance layer and the blue color resistance layer respectively comprise a color film part, a first light transmission part, a second light transmission part and a shading part which are not overlapped; orthographic projections of the color film parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer on the substrate respectively cover orthographic projections of the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit on the substrate; the light shielding parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer are all positioned in the regions except the color film parts, the first light transmission parts and the second light transmission parts; wherein an orthographic projection of the red light emitting unit on the substrate is positioned within an overlapping area of an orthographic projection of the first light transmitting portion of the green color resist layer on the substrate and an orthographic projection of the first light transmitting portion of the blue color resist layer on the substrate; the orthographic projection of the green light-emitting unit on the substrate is positioned within the overlapping area of the orthographic projection of the first light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the blue color resistance layer on the substrate; the orthographic projection of the blue light-emitting unit on the substrate is positioned within the overlapping area of the orthographic projection of the second light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the green color resistance layer on the substrate.
The red color resistance layer, the green color resistance layer and the blue color resistance layer are sequentially stacked in the packaging cover plate, and the red color resistance layer is close to the display substrate; because the red color resistance layer, the green color resistance layer and the blue color resistance layer are sequentially stacked in the packaging cover plate, the distance between the red color resistance layer and the red light-emitting unit is less than the distance between the green color resistance layer and the green light-emitting unit, and the distance between the green color resistance layer and the green light-emitting unit is less than the distance between the blue color resistance layer and the blue light-emitting unit; thus, the path of the red light emitted by the red light-emitting unit to emit the red color resistance layer is shortened, the path of the blue light emitted by the blue light-emitting unit and the path of the green light emitted by the green light-emitting unit to emit the blue color resistance layer and the green color resistance layer respectively are increased, the attenuation of the red light is relatively reduced, and the attenuation of the green light and the blue light is relatively increased; therefore, the attenuation degrees of the red light, the green light and the blue light tend to be consistent, the brightness of the red light, the green light and the blue light emitted out of the display panel tends to be consistent, and the problem that the color of a large-visual-angle picture of the display panel is bluish is finally solved.
Further, in the related art, the display panel has a reflection function on the external light, and the formed reflected light affects the display effect. According to the invention, the red color resistance layer, the green color resistance layer and the blue color resistance laminated layer are arranged, so that on one hand, external light entering the display panel can be weakened, on the other hand, the transmission path of reflected light exiting the display panel can be increased, and on the other hand, a large amount of reflected light can be absorbed; therefore, the reflectivity of the display panel is reduced to a greater degree, and the problem that the display content is unclear due to strong reflection is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a related art display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of different color light-emitting layers of a related art display panel according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a first display panel according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a second display panel according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a third display panel structure according to an embodiment of the present invention;
fig. 6-8 are schematic structural diagrams illustrating an intermediate process of manufacturing a display panel according to an embodiment of the invention;
fig. 9 is data of the luminous intensity of a display panel according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating three structural designs of a color resistance layer of a display panel according to an embodiment of the present invention;
FIG. 11 is a graph showing reflectivity data for different red, green, and blue color resist layer designs of FIG. 10;
fig. 12 is a transmittance map of color film portions of red, green, and blue color resist layers of a display panel according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a fourth display panel according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiments of the present invention, the terms "first", "second", and the like are used for distinguishing identical items or similar items having substantially the same functions and actions, and are used only for clearly describing technical solutions of the embodiments of the present invention, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.
In the embodiments of the present invention, the terms "on" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the structures or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example one
An embodiment of the present invention provides a related art display panel as shown in fig. 1, which includes a package cover 300 and a display substrate 400, the display substrate includes a red light emitting layer 31, a green light emitting layer 32, and a blue light emitting layer 33, the package cover includes a red color film layer 1 corresponding to the red light emitting layer 31, a green color film layer 2 corresponding to the green light emitting layer 32, a blue color film layer 3 corresponding to the blue light emitting layer 33, a black matrix 4, and an organic thin film package layer 34 (IJP layer). The display panel shown in fig. 1 has problems of a dark color and a high reflectance of a large viewing angle screen. When the color of the displayed picture is green, the color display of the picture is influenced, and the display effect is seriously reduced; when the reflectivity is too high, the display panel may form strong reflection under natural light, especially under strong external light, which may make the display content unclear and affect the user experience.
Generally, the reasons for the color of the large-viewing-angle display picture are mainly two-fold. In the first aspect, in the light transmission process, the red light passing through the red color film layer has the most luminance attenuation (L-decay) in the process of emitting the red light out of the display panel, the green light passing through the green color film layer has the second luminance attenuation in the process of emitting the green light out of the display panel, and the blue light passing through the blue color film layer has the least luminance attenuation in the process of emitting the blue light out of the display panel. The red light, the green light and the blue light have different brightness attenuation degrees, after the light rays are emitted out of the display panel, the intensity (brightness) of the red light emitted out of the display panel is the minimum, the intensity of the green light is the next highest, and the intensity of the blue light is the maximum, which is more serious under a large visual angle, and macroscopically, the large visual angle image color of the display panel is bluish, which is one of the main reasons for generating the large visual angle image color bluish. In a second aspect, fig. 2 is a schematic structural diagram of a red light emitting layer 31, a green light emitting layer 32 and a blue light emitting layer 33 of a display panel in the related art, wherein fig. 2 is a cross-sectional view of the red light emitting layer, the green light emitting layer and the blue light emitting layer in fig. 1 along a direction parallel to a display substrate. Referring to fig. 2, since the red light emitting layer 31 has the smallest area, the green light emitting layer 32 has the second area, and the blue light emitting layer 33 has the largest area, the red light, the green light and the blue light emitted from the display panel are the smallest, the green light and the blue light emitted from the display panel are the largest, and the intensities of the red light, the green light and the blue light emitted from the display panel are not consistent, so that the display panel has a problem of bluish color of the large-viewing-angle screen.
To solve the above problems, embodiments of the present invention provide a display panel. Referring to fig. 3, the display panel includes a display substrate 100 and a package cover 200 stacked; the display substrate 100 includes a substrate 5 and red, green and blue light emitting units 6, 7 and 8 arranged in an array on the substrate 5; the package cover plate 200 comprises a red color resist layer, a green color resist layer and a blue color resist layer which are sequentially stacked; the red color resist layer is adjacent to the display substrate 100.
The red color resistance layer, the green color resistance layer and the blue color resistance layer respectively comprise a color film part, a first light transmission part, a second light transmission part and a shading part which are not overlapped with each other.
The above non-overlapping means that: the color film part, the first light-transmitting part, the second light-transmitting part and the light-shielding part of the red color resistance layer (or the green color resistance layer, or the blue color resistance layer) do not have overlapping areas in the projection on the substrate along the direction vertical to the substrate.
Referring to fig. 3, the red color resist layer includes a color filter 101, a first light-transmitting portion 102, a second light-transmitting portion 103, and a light-shielding portion 104 of the red color resist layer, which are not overlapped with each other. The green color resist layer includes a color film portion 111, a first transmissive portion 112, a second transmissive portion 113, and a light shielding portion 114 of the green color resist layer, which are not overlapped with each other. The blue color resist layer includes a color film portion 121, a first transparent portion 122, a second transparent portion 123, and a light shielding portion 124 of the blue color resist layer that do not overlap each other.
The color film parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer are respectively made of red, green and blue organic materials. At this time, the color film portion of the red color resist layer can only transmit red light, the color film portion of the green color resist layer can only transmit green light, and the color film portion of the blue color resist layer can only transmit blue light. The first light transmission part and the second light transmission part of the red color resistance layer, the green color resistance layer and the blue color resistance layer are all made of light transmission materials.
The light-shielding parts of the red resist layer, the green resist layer and the blue resist layer may all be made of a black matrix material. Or, the shading part of the red color resistance layer can also be made of the same material as the color film part of the red color resistance layer by a one-time composition process; the light shielding part of the green color resistance layer can be made of the same material as the color film part of the green color resistance layer by a one-step composition process; the light shielding part of the blue color resistance layer can be made of the same material as the color film part of the blue color resistance layer by a one-step composition process.
The primary patterning process refers to a process for forming a required layer structure through primary film formation and photoetching. The primary patterning process includes film formation, exposure, development, lift-off, and the like.
Referring to fig. 3, orthographic projections of color film portions of the red, green, and blue color resists on the substrate respectively cover orthographic projections of the red, green, and blue light emitting units 6, 7, and 8 on the substrate; the light shielding portions of the red color resist layer, the green color resist layer and the blue color resist layer are all located in regions except the color film portions, the first light transmission portions and the second light transmission portions.
The orthographic projection of the color film parts of the red color resist layer, the green color resist layer and the blue color resist layer on the substrate has the following meanings: and the color film parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer are projected on the substrate along the direction vertical to the substrate.
The orthographic projection of the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit on the substrate means that: the red light emitting unit, the green light emitting unit, and the blue light emitting unit are projected on the substrate in a direction perpendicular to the substrate.
The orthographic projections of the color film parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer on the substrate respectively cover the orthographic projections of the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit on the substrate, and the meanings are as follows: taking the projection relationship between the red color resist layer and the red light-emitting unit as an example to explain that the projection of the red light-emitting unit on the substrate along the direction vertical to the substrate is completely overlapped with the projection of the red color resist layer on the substrate along the direction vertical to the substrate; or the projection of the red light-emitting unit on the substrate along the direction vertical to the substrate is within the projection area of the red color resistance layer on the substrate along the direction vertical to the substrate. The meaning of the projection relationship between the green color resistance layer and the green light emitting unit and between the blue color resistance layer and the blue light emitting unit is similar to the meaning of the projection relationship between the red color resistance layer and the red light emitting unit, and is not described herein again.
Referring to fig. 13, an orthogonal projection a of the red light emitting unit 6 on the substrate is located within an overlapping region of an orthogonal projection B of the first light transmitting portion 112 of the green color resist on the substrate and an orthogonal projection C of the first light transmitting portion 122 of the blue color resist on the substrate. The orthographic projection D of the green light emitting unit 7 on the substrate is positioned within the overlapping area of the orthographic projection E of the first light transmitting portion 102 of the red color resist layer on the substrate and the orthographic projection F of the second light transmitting portion 123 of the blue color resist layer on the substrate. The orthographic projection G of the blue light emitting unit 8 on the substrate is positioned within the overlapping area of the orthographic projection I of the second light transmitting portion 103 of the red color resist on the substrate and the orthographic projection H of the second light transmitting portion 113 of the green color resist on the substrate.
The meaning that the orthographic projection of the red light-emitting unit on the substrate is positioned in the overlapping region of the orthographic projection of the first light-transmitting part of the green color resistance layer on the substrate and the orthographic projection of the first light-transmitting part of the blue color resistance layer on the substrate is as follows: an overlapping area exists between the orthographic projection of the first light-transmitting part of the green color resistance layer on the substrate and the orthographic projection of the first light-transmitting part of the blue color resistance layer on the substrate, and the orthographic projection of the red light-emitting unit on the substrate is located within the overlapping area.
The forward projection of the green light-emitting unit on the substrate is positioned in an overlapping area of the forward projection of the first light-transmitting part of the red color resistance layer on the substrate and the forward projection of the second light-transmitting part of the blue color resistance layer on the substrate, and the forward projection of the second light-transmitting part of the blue color resistance layer on the substrate is defined as follows: an overlapping area exists between the orthographic projection of the first light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the blue color resistance layer on the substrate, and the orthographic projection of the green light-emitting unit on the substrate is located within the overlapping area.
The meaning that the orthographic projection of the blue light-emitting unit on the substrate is positioned in the overlapping region of the orthographic projection of the second light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the green color resistance layer on the substrate is as follows: an overlapping area exists between the orthographic projection of the second light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the green color resistance layer on the substrate, and the orthographic projection of the blue light-emitting unit on the substrate is located within the overlapping area.
To further explain that the display panel provided by the embodiment can improve the problem of color bluing of the large-viewing-angle picture, reduce the reflectivity and improve the display effect, the following description is made with reference to the related data.
Fig. 9 shows the intensity of red, green and blue light emitted from the display panel when the thickness of the organic thin film encapsulation layer (IJP layer) 34 is different (6, 8, 10um, respectively) by adjusting the thickness of the organic thin film encapsulation layer in the display panel shown in fig. 1. Where the abscissa in fig. 9 is the thickness of the IJP layer and the ordinate is the light intensity. As can be seen from the figure, as the thickness of the IJP layer is reduced, the intensity of red light exiting the display panel increases; as the thickness of the IJP layer increases, the intensity of the green and blue light exiting the display panel decreases. From the above data, one can obtain: the red light intensity is in inverse proportion to the thickness of the IJP layer and the light intensity changes greatly with the change of the film thickness, while the green light and blue light intensity is in direct proportion to the thickness of the IJP layer and the light intensity changes slightly with the change of the film thickness. Based on this, in the display panel provided in this embodiment, referring to fig. 3, fig. 4, or fig. 5, the red color resist layer is adjacent to the display substrate, the green color resist layer and the blue color resist layer are sequentially stacked on the red color resist layer, a distance h1 between the red color resist layer and the red light emitting unit is smaller than a distance h2 between the green color resist layer and the green light emitting unit, and a distance h2 between the green color resist layer and the green light emitting unit is smaller than a distance h3 between the blue color resist layer and the blue light emitting unit; thus, the path of the red light emitted by the red light-emitting unit to emit the red color resistance layer is shortened, the path of the blue light emitted by the blue light-emitting unit and the path of the green light emitted by the green light-emitting unit to emit the blue color resistance layer and the green color resistance layer respectively are increased, the attenuation of the red light is relatively reduced, and the attenuation of the green light and the blue light is relatively increased; therefore, the attenuation degrees of the red light, the green light and the blue light tend to be consistent, the brightness of the red light, the green light and the blue light emitted out of the display panel tends to be consistent, and the problem that the color of a large-visual-angle picture of the display panel is bluish is finally solved.
Referring to fig. 10 and 11, three designs are shown in fig. 10 in which the areas of the red, green and blue color resist layers are increased in steps, and the design areas are increased in steps from fig. 10 (1) to fig. 10 (3). The data shown in FIG. 11 are reflectance test results for the three designs shown in FIG. 10. As can be seen from the data in fig. 11, as the areas of the red, green, and blue color film layers increase, the reflectivity of the display panel gradually decreases, wherein the reflectivity measured in design (3) decreases by 10% compared to the reflectivity measured in design (1). Based on this, according to the display panel provided by this embodiment, since the red color resist layer, the green color resist layer, and the blue color resist layer are stacked in the package cover plate, not only the area of the light absorbing layer (where the red color resist layer, the green color resist layer, and the blue color resist layer are collectively referred to as the light absorbing layer) is increased in the transverse direction, but also the thickness of the light absorbing layer is increased in the longitudinal direction, so that more reflected light can be absorbed, the reflectivity of the display panel is reduced to a greater extent, and further, the problem that the display content is unclear due to strong reflection is avoided.
Optionally, in the red color resist layer, the green color resist layer, and the blue color resist layer, the color film portion included in each color resist layer is the same as the light-shielding portion.
The light shielding part of the red color resistance layer can be made of the same material as the color film part of the red color resistance layer in a one-step composition process; the light shielding part of the green color resistance layer can be made of the same material as the color film part of the green color resistance layer in a one-step composition process; the light shielding part of the blue color resistance layer can be made of the same material as the color film part of the blue color resistance layer in a one-step composition process.
The primary patterning process refers to a process for forming a required layer structure through primary film formation and photoetching. The primary patterning process includes film formation, exposure, development, lift-off, and the like.
When each light-shielding portion is made of the same material as the color film portion of the color resist layer where the light-shielding portion is located, referring to fig. 3, an overlapping region formed by overlapping the color film portion 101 of the red color resist layer, the color film portion 111 of the green color resist layer, and the light-shielding portion 124 of the blue color resist layer is equivalent to a region where red, green, and blue colors are mixed to form black, and light of three colors, namely red, green, and blue, can be absorbed, so that the light-shielding function can be realized in place of a Black Matrix (BM). The overlapping region formed by overlapping the light-shielding portion 104 of the red resist, the color film portion 111 of the green resist, and the color film portion 121 of the blue resist is also equivalent to a region where the colors of red, green, and blue are mixed to form black, and the light-shielding function can be realized instead of a black matrix. The overlapping area formed by the three overlapping of the color film portion 101 of the red resist layer, the light-shielding portion 114 of the green resist layer, and the light-shielding portion 124 of the blue resist layer is also equivalent to an area where black is formed by mixing red, green, and blue colors, and can also realize a light-shielding function instead of a black matrix. The shading parts are made of the same material as the color film part of the color resistance layer where the shading parts are located in a one-time composition process, and the problems of low alignment precision, residual black matrix material (Remain) and Peeling black matrix material (Peeling) in the process of making a black matrix by using the black matrix material are solved.
Optionally, as shown in fig. 4, the package cover further includes a first flat layer 13, a second flat layer 14, and a third flat layer 15. Wherein, the first flat layer 13 covers the red color resist layer; the second flat layer 14 covers the green color resist layer; the third planarization layer 15 covers the blue color resist layer; the first flat layer, the second flat layer and the third flat layer are made of the same light-transmitting material.
A first flat layer is arranged between the red color resistance layer and the green color resistance layer, and a second flat layer is arranged between the green color resistance layer and the blue color resistance layer; the first flat layer and the second flat layer can both play a role in flattening, and meanwhile, the first flat layer can also effectively increase the distance between the green color resistance layer and the green light-emitting unit, and the first flat layer and the second flat layer can also increase the distance between the blue color resistance layer and the blue light-emitting unit; therefore, the green light and the blue light emitted from the display substrate are further weakened, the intensity of the red light, the intensity of the green light and the intensity of the blue light emitted out of the display panel are basically consistent, and the problem that the color of a large-viewing-angle picture of the display panel is bluish is further improved.
The third flat layer covers the blue color resistance layer, plays a role in flattening, and simultaneously plays a role in protecting the blue color resistance layer, so that the influence of damage of the blue color resistance layer on the color of a display picture is avoided, and the display effect is further improved.
Optionally, the thicknesses of the first flat layer, the second flat layer and the third flat layer along the direction perpendicular to the substrate are all in the range of 2-6um. Illustratively, the thickness of the first, second, and third planar layers may each be 2.2um, 3um, 3.5um, or 4um.
The thickness ranges of the first flat layer, the second flat layer and the third flat layer are all 2-6um; when the thickness of the green light-emitting device is less than 2um, the distance between the green color resistance layer and the green light-emitting unit and the distance between the blue color resistance layer and the blue light-emitting unit cannot be increased remarkably, so that the effect of weakening green light and blue light emitted from the display substrate is not remarkable, and the problem that the color of a large-viewing-angle picture of the display panel is bluish cannot be further improved; when the thickness of the film is larger than 6um, the thickness of the whole film layer is overlarge, the transmission paths of red light, green light and blue light emitted out of the display panel are increased, the whole light intensity of the red light, the green light and the blue light is reduced, and the energy consumption is increased.
Optionally, the material of all the first light-transmitting portions and all the second light-transmitting portions is the same as the material of the first planarization layer.
When the first light transmission part and the second light transmission part of each color resistance layer are made of the same material as the first flat layer, the second flat layer and the third flat layer are made of the same light transmission material, so that the first flat layer, the second flat layer and the third flat layer as well as the first light transmission part and the second light transmission part of each color resistance layer are made of the same light transmission material. At this time, the number of interfaces between different materials through which light passes in the process of emitting the display panel is reduced, so that the light intensity loss caused by refraction of the interfaces between the different materials is avoided, and the display effect is further improved.
Alternatively, referring to fig. 5, an orthographic projection of the first light-transmitting portion 112 of the green color resist layer on the substrate and an orthographic projection of the first light-transmitting portion 122 of the blue color resist layer on the substrate completely overlap; the orthographic projection of the first light-transmitting part 102 of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part 123 of the blue color resistance layer on the substrate are completely overlapped; the orthographic projection of the second light-transmitting portion 103 of the red color resist layer on the substrate and the orthographic projection of the second light-transmitting portion 113 of the green color resist layer on the substrate completely overlap. At the moment, the display panel is simple in structure and convenient to manufacture.
Alternatively, referring to fig. 13, an orthogonal projection B of the first light-transmitting portion 112 of the green color resist on the substrate is located within an orthogonal projection C of the first light-transmitting portion 122 of the blue color resist on the substrate; the orthographic projection H of the second light-transmitting portion 113 of the green resist layer on the substrate is within the orthographic projection I of the second light-transmitting portion 103 of the red resist layer on the substrate. The projection relationship between the first light-transmitting portion of the red resist layer and the second light-transmitting portion of the blue resist layer on the substrate is not limited and can be determined according to actual conditions. Further, in practical applications, referring to fig. 4, specific sizes of a distance L1 from an edge of the first light transmission portion of the green color resist layer to an edge of the first light transmission portion of the blue color resist layer, a distance L2 from an edge of the first light transmission portion of the red color resist layer to an edge of the second light transmission portion of the blue color resist layer, and a distance L3 from an edge of the second light transmission portion of the red color resist layer to an edge of the second light transmission portion of the green color resist layer may be determined according to actual situations.
The regular trapezoid light transmission area formed by the first light transmission part of the green color resistance layer and the first light transmission part of the blue color resistance layer is more beneficial to the emission of red light, and the intensity of the red light emitted out of the display panel is increased; the inverted trapezoidal light transmission area formed by the second light transmission part of the green color resistance layer and the second light transmission part of the red color resistance layer can reduce the intensity of blue light emitted out of the display panel; the red light intensity is increased, and the blue light intensity is weakened, so that the red light, the green light and the blue light emitted out of the display panel are consistent in intensity, the red light, the green light and the blue light emitted out of the display panel are consistent in brightness, and the problem that the color of a large-visual-angle picture of the display panel is blue is further improved.
Furthermore, the problem of the blue-green color of the display panel with large viewing angle can be improved by adjusting the sizes of the first light transmission part and the second light transmission part of each color resistance layer. FIG. 12 is a graph showing light transmittance patterns of the color film portion of the red resist layer, the color film portion of the green resist layer, and the color film portion of the blue resist layer. As can be seen from the figure, the color film portion of the red resist layer can only transmit red light, the color film portion of the green resist layer can only transmit green light, and the color film portion of the blue resist layer can only transmit blue light. Then, increasing the size of the first transmissive portion 112 of the green color resist and the first transmissive portion 122 of the blue color resist corresponding to the color film portion 101 of the red color resist as shown in fig. 3 at the same time can increase the intensity of red light emitted out of the display panel; similarly, by reducing the sizes of the second light-transmitting portions 113 and 103 of the green and red color resists corresponding to the color film portion 121 of the blue color resist as shown in fig. 3, the intensity of the blue light emitted from the display panel can be reduced, so that the attenuation degrees of the red, green and blue light are consistent, and the problem of the bluish color of the large-viewing-angle picture of the display panel is further improved.
The display panel may further include other structures or film layers, for example, the display panel further includes an Anode 20 (Anode), a pixel defining layer 21 (HPDL), a first inorganic packaging thin film layer 22 (CVD 1 layer), an organic packaging layer 23 (IJP layer), a second inorganic thin film packaging thin film layer 24 (CVD 2 layer), a Buffer layer 25 (Buffer), an active layer (P-Si) 26, a source-drain metal layer 27 (SD layer), and a Gate layer 28 (Gate 1 layer) as shown in fig. 3, and may further include a Gate insulating layer (GI 1), an interlayer insulating layer (GI 2), an interlayer dielectric layer (ILD layer), and an organic planarization layer (PLN 1). Only the structures or film layers related to the invention point are described herein, and those skilled in the art can know other structures or film layers included in the OLED display panel through the prior art and the common general knowledge.
Example two
An embodiment of the present invention provides a display device, including the display panel in the first embodiment. The display device can be any product or component with a display function, such as a display device such as an OLED display, a television, a digital camera, a mobile phone, a tablet computer and the like comprising the display device.
It should be noted that, in the first embodiment, the structure of the display panel has been described in detail, and thus, the description is omitted here.
EXAMPLE III
The embodiment of the invention provides a manufacturing method of a display panel in the first embodiment, which comprises the following steps:
s1, providing a substrate (PI).
And S2, forming a display substrate above the substrate.
And S3, forming a packaging cover plate on the display substrate.
Wherein, S2, forming the display substrate on the substrate comprises:
and S21, forming a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit which are arranged in an array by adopting an evaporation process (EV process).
The red light emitting unit, the green light emitting unit, and the blue light emitting unit may each include a plurality of layers, including, for example: a hole injection layer (HIL layer), a hole transport layer (HTL layer), an electron blocking layer (Prime layer), a light emitting layer (red, green, blue EML layer), a hole blocking layer (HBL layer), and an electron injection layer (EIL layer).
Further optionally, before forming the red light emitting units, the green light emitting units, and the blue light emitting units arranged in an array, forming the display substrate further includes:
and S20, forming a driving circuit Board (BP).
The driving circuit board includes an active layer (P-Si) 26, a source-drain metal layer 27 (SD layer), a Gate layer 28 (Gate 1 layer), a wiring layer (Gate 2 layer), a Gate insulating layer (GI 1), an interlayer insulating layer (GI 2), and a pixel defining layer (HPDL) as shown in fig. 3.
Wherein, S3, forming the package cover plate on the display substrate includes:
s31, sequentially forming a red color resistance layer, a green color resistance layer and a blue color resistance layer; the red color resist layer is adjacent to the display substrate.
Further optionally, after forming the red light emitting unit, the green light emitting unit, and the blue light emitting unit arranged in an array and before forming the red color resist layer, the green color resist layer, and the blue color resist layer, forming the package cover further includes:
and S32, forming a cathode on the red light emitting unit, the green light emitting unit and the blue light emitting unit.
S33, a first inorganic encapsulating thin film layer 22 (CVD 1 layer), an organic encapsulating layer 23 (IJP layer), and a second inorganic thin film encapsulating layer 24 (CVD 2 layer) as shown in fig. 6 are sequentially formed on the cathode, wherein the fabrication process is also referred to as EN encapsulation process.
Optionally, before forming the green color resist layer and after forming the red color resist layer, forming the package cover further includes:
s311, forming a first flat layer;
before forming the blue color resist layer and after forming the green color resist layer, forming the package cover plate further includes:
s312, forming a second flat layer;
after forming the blue color resist layer, forming the package cover plate further comprises:
and S313, forming a third flat layer.
It should be noted that, when the materials of the first light-transmitting portion and the second light-transmitting portion of the red resist layer are the same as those of the first flat layer, the first light-transmitting portion and the second light-transmitting portion can be formed at the same time; when the first and second light-transmitting portions of the red resist layer are different from the material of the first planarization layer, the first and second light-transmitting portions of the red resist layer may be formed at the same time, and the first planarization layer is formed after the first and second light-transmitting portions of the red resist layer.
The forming process of the first and second light transmission parts of the green color resistance layer and the second flat layer, and the first and second light transmission parts of the blue color resistance layer and the third flat layer is similar to the forming process of the first and second light transmission parts of the red color resistance layer and the first flat layer, and is not repeated here.
The following will specifically describe the manufacturing method of the first, second and third flat layers for the red, green and blue color resists by taking the structure shown in fig. 4 as an example:
s01, referring to fig. 7, a red color resist film is formed on the second inorganic thin film encapsulation thin film layer 24 and patterned, thereby obtaining a color film portion 101, a first opening, a second opening, and a light shielding portion 104 of the red color resist layer.
And S02, forming a light-transmitting film on the red color resistance layer, wherein the light-transmitting film comprises a first light-transmitting film and a second light-transmitting film. The first transparent film fills the first opening and the second opening of the red color resist layer to form a first transparent portion 102 and a second transparent portion 103 of the red color resist layer as shown in fig. 7; the second light-transmitting film covers the red resist layer, forming the first planarization layer 13 as shown in fig. 7.
S03, referring to fig. 8, a green color resist film is formed and patterned on the first flat layer 13, thereby obtaining a color film portion 111, first and second openings, and a light-shielding portion 114 of the green color resist layer.
And S04, forming a light-transmitting film on the green color resistance layer, wherein the light-transmitting film comprises a first light-transmitting film and a second light-transmitting film. The first transparent film fills the first opening and the second opening of the green color resist layer to form a first transparent portion 112 and a second transparent portion 113 of the green color resist layer as shown in fig. 8; the second light-transmitting film covers the green resist layer, forming a second planarization layer 14 as shown in fig. 8.
S05, referring to fig. 4, a blue color resist film is formed and patterned on the second planarization layer 14, and the color film portion 121, the first opening, the second opening, and the light shielding portion 124 of the blue color resist layer are obtained.
And S06, forming a light-transmitting film on the blue color resistance layer, wherein the light-transmitting film comprises a first light-transmitting film and a second light-transmitting film. The first transparent film fills the first opening and the second opening of the blue color resist layer to form a first transparent portion 122 and a second transparent portion 123 of the blue color resist layer as shown in fig. 4; the second light-transmitting film covers the blue resist layer to form a third planarization layer 15 as shown in fig. 4.
The material of the light-shielding part of the red color resistance layer is the same as that of the color film part of the red color resistance layer, the material of the light-shielding part of the green color resistance layer is the same as that of the color film part of the green color resistance layer, and the material of the light-shielding part of the blue color resistance layer is the same as that of the color film part of the blue color resistance layer.
When each light-shielding portion is made of the same material as the color film portion of the color resist layer where the light-shielding portion is located, referring to fig. 3, an overlapping region formed by overlapping the color film portion 101 of the red color resist layer, the color film portion 111 of the green color resist layer, and the light-shielding portion 124 of the blue color resist layer is equivalent to a region where red, green, and blue colors are mixed to form black, and light of three colors, namely red, green, and blue, can be absorbed, so that the light-shielding function can be realized in place of a Black Matrix (BM). The overlapping region formed by overlapping the light-shielding portion 104 of the red resist, the color film portion 111 of the green resist, and the color film portion 121 of the blue resist is also equivalent to a region where the colors of red, green, and blue are mixed to form black, and the light-shielding function can be realized instead of a black matrix. The overlapping region formed by superimposing the color film portion 101 of the red resist layer, the light-shielding portion 114 of the green resist layer, and the light-shielding portion 124 of the blue resist layer is also equivalent to a region where the colors of red, green, and blue are mixed to form black, and the light-shielding function can be realized instead of the black matrix. The shading parts are made of the same material as the color film part of the color resistance layer where the shading parts are located in a one-time composition process, and the problems of low alignment precision, residual black matrix material (Remain) and Peeling black matrix material (Peeling) in the process of making a black matrix by using the black matrix material are solved.
The first flat layer, the second flat layer and the third flat layer are made of the same light-transmitting material.
The thicknesses of the first flat layer, the second flat layer and the third flat layer along the direction vertical to the substrate are all 2-6um. Illustratively, the first, second, and third flat layers may each be 2.2um, 3um, 3.5um, or 4um thick.
The materials of all the first light transmission parts and all the second light transmission parts are the same as the material of the first flat layer.
When the first light-transmitting part and the second light-transmitting part of each color resist layer are made of the same material as the first flat layer, the second flat layer and the third flat layer are made of the same light-transmitting material, so that the first flat layer, the second flat layer and the third flat layer and the first light-transmitting part and the second light-transmitting part of each color resist layer are made of the same light-transmitting material. At this time, the number of interfaces between different materials through which light passes in the process of emitting the display panel is reduced, so that the light intensity loss caused by refraction of the interfaces between the different materials is avoided, and the display effect is further improved.
The display panel further comprises other structures or film layers, and the manufacturing method of the display panel further comprises the manufacturing of the other structures or film layers. Only the structures or the methods for fabricating the film layers related to the present invention will be described, and those skilled in the art can know other structures or methods for fabricating the film layers included in the OLED display panel through the prior art and the common general knowledge.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (9)

1. The display panel is characterized by comprising a display substrate and an encapsulation cover plate which are arranged in a stacked mode; the display substrate comprises a substrate, and a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit which are arranged on the substrate in an array manner; the packaging cover plate comprises a red color resistance layer, a green color resistance layer and a blue color resistance layer which are sequentially stacked; the red color resistance layer is close to the display substrate;
the red color resistance layer, the green color resistance layer and the blue color resistance layer respectively comprise a color film part, a first light transmission part, a second light transmission part and a shading part which are not overlapped;
orthographic projections of the color film parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer on the substrate respectively cover orthographic projections of the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit on the substrate; the light shielding parts of the red color resistance layer, the green color resistance layer and the blue color resistance layer are all positioned in the regions except the color film parts, the first light transmission parts and the second light transmission parts;
wherein an orthographic projection of the red light emitting unit on the substrate is positioned within an overlapping area of an orthographic projection of the first light transmitting portion of the green color resist layer on the substrate and an orthographic projection of the first light transmitting portion of the blue color resist layer on the substrate; the orthographic projection of the green light-emitting unit on the substrate is positioned within the overlapping area of the orthographic projection of the first light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the blue color resistance layer on the substrate; the orthographic projection of the blue light-emitting unit on the substrate is positioned within the overlapping area of the orthographic projection of the second light-transmitting part of the red color resistance layer on the substrate and the orthographic projection of the second light-transmitting part of the green color resistance layer on the substrate;
the package lid further comprises a first planar layer, a second planar layer, and a third planar layer;
wherein the first planarization layer covers the red color resist layer; the second flat layer covers the green color resistance layer; the third flat layer covers the blue color resistance layer; the first flat layer, the second flat layer and the third flat layer are made of the same light-transmitting material.
2. The display panel according to claim 1, wherein the color film portion of each of the red resist layer, the green resist layer, and the blue resist layer is made of the same material as the light shielding portion.
3. The display panel according to claim 1, wherein the first, second, and third flat layers each have a thickness in a range of 2-6um in a direction perpendicular to the substrate.
4. The display panel of claim 1, wherein a material of all of the first light-transmitting portions and all of the second light-transmitting portions is the same as a material of the first planarization layer.
5. The display panel according to claim 1, wherein an orthogonal projection of the first light-transmitting portion of the green color resist layer on the substrate is located within an orthogonal projection of the first light-transmitting portion of the blue color resist layer on the substrate; the orthographic projection of the second light-transmitting part of the green color resistance layer on the substrate is positioned within the orthographic projection of the second light-transmitting part of the red color resistance layer on the substrate.
6. The display panel according to claim 1, wherein an orthographic projection of the first light-transmitting portion of the green color resist layer on the substrate and an orthographic projection of the first light-transmitting portion of the blue color resist layer on the substrate completely overlap; an orthographic projection of the first light-transmitting portion of the red color-resisting layer on the substrate and an orthographic projection of the second light-transmitting portion of the blue color-resisting layer on the substrate are completely overlapped; an orthographic projection of the second light-transmitting portion of the red color resist layer on the substrate and an orthographic projection of the second light-transmitting portion of the green color resist layer on the substrate completely overlap.
7. A display device characterized by comprising the display panel according to any one of claims 1 to 6.
8. A method of manufacturing a display panel according to any one of claims 1 to 6, the method comprising:
providing a substrate;
forming a display substrate over the substrate;
forming a package cover over the display substrate;
the forming a display substrate includes:
forming a red light emitting unit, a green light emitting unit and a blue light emitting unit which are arranged in an array;
the forming of the package cover plate comprises:
sequentially forming a red color resistance layer, a green color resistance layer and a blue color resistance layer; the red color resist layer is adjacent to the display substrate.
9. The method of claim 8,
before forming the green color resist layer and after forming the red color resist layer, the forming the package cover plate further includes:
forming a first flat layer;
before forming the blue color resist layer and after forming the green color resist layer, the forming the package cover plate further includes:
forming a second flat layer;
after forming the blue color resist layer, the forming the package cover plate further includes:
a third flat layer is formed.
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