WO2022170666A1 - 显示面板及显示装置 - Google Patents

显示面板及显示装置 Download PDF

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Publication number
WO2022170666A1
WO2022170666A1 PCT/CN2021/082422 CN2021082422W WO2022170666A1 WO 2022170666 A1 WO2022170666 A1 WO 2022170666A1 CN 2021082422 W CN2021082422 W CN 2021082422W WO 2022170666 A1 WO2022170666 A1 WO 2022170666A1
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WO
WIPO (PCT)
Prior art keywords
layer
light
display panel
auxiliary
electrode layer
Prior art date
Application number
PCT/CN2021/082422
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English (en)
French (fr)
Inventor
金蒙
吕磊
袁涛
黄金昌
Original Assignee
武汉华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US17/285,108 priority Critical patent/US20240032344A1/en
Publication of WO2022170666A1 publication Critical patent/WO2022170666A1/zh

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Classifications

    • 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
    • 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
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • 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
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors
    • 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
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80521—Cathodes characterised by their shape

Definitions

  • the present application relates to the field of display, and in particular, to a display panel and a display device.
  • the display panel includes a first display area for both display and photography and a second display area for display only.
  • a first display area for both display and photography
  • a second display area for display only.
  • Embodiments of the present application provide a display panel and a display device, which can improve the light transmittance of the display panel and improve the imaging effect of the under-screen camera.
  • An embodiment of the present application provides a display panel, including a first display area and a second display area, the light transmittance of the first display area is greater than the light transmittance of the second display area, and the light transmittance of the first display area is greater than that of the second display area.
  • the display panel includes a pixel area and a light-transmitting area located between the pixel areas, and the display panel includes:
  • the pixel definition layer is provided with at least one light-transmitting hole, and the light-transmitting hole is located in the corresponding light-transmitting area;
  • an auxiliary layer comprising at least one auxiliary part, the auxiliary part is located in the corresponding light-transmitting hole;
  • the first electrode layer is located on the auxiliary layer.
  • the light-transmitting hole includes a top opening, a bottom opening and a side wall, and the size of the top opening is larger than that of the bottom opening.
  • the display panel further includes a second electrode layer, the pixel definition layer is disposed on the second electrode layer, and the second electrode layer includes a plurality of second electrode layers. electrodes, each of the second electrodes is located in the corresponding pixel region, and the distance between the outer edge of the sidewall at the bottom opening and the outer edge of the adjacent second electrode is 2- 5 microns.
  • the display panel further includes a light-emitting unit layer
  • the light-emitting unit layer includes a first light-emitting unit layer, a second light-emitting unit layer, and a third light-emitting unit layer arranged in layers
  • the second light-emitting unit layer is disposed between the first light-emitting unit layer and the third light-emitting unit layer
  • the pixel definition layer further includes a pixel opening corresponding to the second electrode, and the first light-emitting unit layer
  • the unit layer is arranged on the pixel definition layer to cover the pixel opening and the light-transmitting hole and is located under the auxiliary layer
  • the second light-emitting unit layer is arranged in the pixel opening
  • the third light-emitting unit layer is arranged in the pixel opening.
  • a unit layer covers the second light emitting unit layer and the first light emitting unit layer and is located under the auxiliary layer.
  • the first electrode layer covers the third light emitting unit layer and at least part of the area of the auxiliary part.
  • the thickness of the first electrode layer on the auxiliary layer is smaller than the thickness of the first electrode layer on the light-emitting unit layer.
  • the auxiliary portion covers the bottom opening of the corresponding light-transmitting hole.
  • the auxiliary portion includes a platform portion and an edge portion located at an edge of the platform portion, and the thickness of the edge portion gradually decreases along a direction away from the platform portion, so The first electrode layer covers at least part of the edge portion.
  • the thickness of the first electrode layer on the edge portion gradually decreases along a direction in which the thickness of the edge portion increases.
  • the first electrode layer covers part of the edge portion.
  • the first electrode layer covers the entire edge portion.
  • the first electrode covers the entire auxiliary layer.
  • the auxiliary layer further covers part of the sidewall of the light-transmitting hole.
  • the display panel further includes a transparent filling layer, and the transparent filling layer is filled in the light-transmitting hole and located on the first electrode layer.
  • the material of the transparent filling layer is a transparent organic material with a light transmittance greater than 95%.
  • the transparent organic material includes polymethyl methacrylate.
  • an embodiment of the present application further provides a display device, including a display panel, the display panel includes a first display area and a second display area, and the light transmittance of the first display area is greater than that of the second display area In the first display area, the display panel includes a pixel area and a light transmission area located between the pixel areas, and the display panel includes:
  • the pixel definition layer is provided with at least one light-transmitting hole, and the light-transmitting hole is located in the corresponding light-transmitting area;
  • an auxiliary layer comprising at least one auxiliary part, the auxiliary part is located in the corresponding light-transmitting hole;
  • the first electrode layer is located on the auxiliary layer.
  • the light-transmitting hole includes a top opening, a bottom opening and a side wall, and the size of the top opening is larger than that of the bottom opening.
  • the display panel further includes a second electrode layer, the pixel definition layer is disposed on the second electrode layer, and the second electrode layer includes a plurality of second electrode layers. electrodes, each of the second electrodes is located in the corresponding pixel region, and the distance between the outer edge of the sidewall at the bottom opening and the outer edge of the adjacent second electrode is 2- 5 microns.
  • the display panel further includes a transparent filling layer, and the transparent filling layer is filled in the light-transmitting hole and located on the first electrode layer.
  • Embodiments of the present application provide a display panel and a display device, the display panel includes a first display area and a second display area, the light transmittance of the first display area is greater than the light transmittance of the second display area,
  • the display panel includes a pixel area and a light-transmitting area located between the pixel areas, the display panel includes: a pixel definition layer with at least one light-transmitting hole, the transparent The light holes are located in the corresponding light-transmitting regions; the auxiliary layer includes at least one auxiliary part, and the auxiliary part is located in the corresponding light-transmitting holes; and a first electrode layer is located on the auxiliary layer.
  • the light transmittance of the light-transmitting hole area is improved, thereby improving the transmittance of the first display area.
  • the light rate improves the light transmittance of the display panel and improves the imaging effect of the under-screen camera.
  • FIG. 1 is a schematic diagram of a first plane structure of a display panel provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a second plane structure of a display panel provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a first cross-sectional structure of a display panel provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a second cross-sectional structure of a display panel provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a third cross-sectional structure of a display panel provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a fourth cross-sectional structure of a display panel provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a fifth cross-sectional structure of a display panel provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a sixth cross-sectional structure of a display panel provided by an embodiment of the present application.
  • the present application provides an OLED display panel that can alleviate this problem.
  • Embodiments of the present application provide a display panel, a method for manufacturing the same, and a display device, which improve the light transmittance of the display panel and improve the imaging effect of the under-screen camera. Each of them will be described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.
  • FIG. 1 shows a schematic diagram of a first plane structure of the display panel provided by the embodiment of the present application
  • FIG. 2 shows the display panel provided by the embodiment of the present application.
  • a schematic diagram of the second type of plane structure specifically a schematic diagram of a partial plane structure of the first display area of the display panel provided by the embodiment of the present application
  • FIG. 3 shows a schematic diagram of the first type of cross-sectional structure of the display panel provided by the embodiment of the present application.
  • a partial cross-sectional structural schematic diagram of the first display area of the display panel provided by the embodiment of the present application that is, the cross-sectional structural schematic diagram along the line aa in FIG. 2 ;
  • FIG. 4 shows a second cross-sectional structure of the display panel provided by the embodiment of the present application.
  • Schematic diagram of the structure FIG. 5 shows a schematic diagram of a third cross-sectional structure of a display panel provided by an embodiment of the present application
  • FIG. 6 shows a schematic diagram of a fourth cross-sectional structure of a display panel provided by an embodiment of the present application
  • FIG. 8 is a schematic diagram of a sixth cross-sectional structure of the display panel provided by an embodiment of the present application.
  • the display panel 10 provided by the embodiment of the present application includes a first display area 11 and a second display area 12 , and the light transmittance of the first display area 11 is greater than that of the second display area 12 .
  • the display panel 10 includes a pixel area AA and a light transmission area TA located between the pixel areas.
  • the display panel 10 includes a pixel definition layer 160 , an auxiliary layer 180 and a first electrode layer 190 .
  • the pixel definition layer 160 is provided with at least one light-transmitting hole 101, and the light-transmitting hole 101 is located in the corresponding light-transmitting area TA; the auxiliary layer 180 includes at least one auxiliary portion 180, and the auxiliary portion 180 is located in the corresponding light-transmitting hole TA. ; The first electrode layer 190 is located above the auxiliary layer 180 .
  • An embodiment of the present application provides a display panel, in which a light transmission hole is arranged in a light transmission area of a pixel definition layer, the pixel definition layer in the light transmission hole is removed, and the light transmittance of the light transmission hole area is improved. , thereby improving the light transmittance of the first display area, the light transmittance of the display panel, and the imaging effect of the under-screen camera.
  • the display panel provided by the embodiment of the present application specifically includes an array substrate, a second electrode layer 150 , a pixel definition layer 160 , a light-emitting unit layer 170 , an auxiliary layer 180 and a first electrode layer 190.
  • the array substrate further includes a substrate 110 , a semiconductor active layer 121 , a first insulating layer 131 , a first gate layer 122 , a second insulating layer 132 , a second gate layer 123 , a third insulating layer 122 , a second insulating layer 132 , a third insulating layer layer 133 , the source and drain layers 124 and the planarization layer 140 .
  • the substrate 110 may be a rigid substrate or a flexible substrate, the rigid substrate is generally a glass substrate, and the flexible substrate generally includes a first organic substrate, an inorganic substrate, and a second inorganic substrate.
  • the semiconductor active layer 121 is patterned to form the active region of the thin film transistor, and the material of the semiconductor active layer 121 may be an oxide semiconductor material, or a polysilicon material or a single crystal silicon material.
  • the first gate electrode layer 122 is patterned to form the first gate electrode of the thin film transistor, and the second gate electrode layer 123 is patterned to form the second gate electrode of the thin film transistor.
  • the source and drain layers 124 are patterned to form source and drain electrodes of the thin film transistor.
  • the thin film transistors and the signal lines together constitute a driving circuit of the display panel 10 for driving the light-emitting unit layer 170 to perform light-emitting display.
  • the first insulating layer 131 is disposed between the semiconductor active layer 121 and the first gate layer 122
  • the second insulating layer 132 is disposed between the first gate layer 122 and the second gate layer 123
  • the third insulating layer 133 Disposed between the second gate layer 123 and the source and drain layers 124 , the first insulating layer 131 , the second insulating layer 132 and the third insulating layer 133 are respectively used to isolate two adjacent conductive layers.
  • the planarization layer 140 is used to planarize the array substrate and provide a planar substrate for the preparation of the second electrode layer 150 on the planarization layer 140 .
  • the material of the planarization layer 140 is generally organic.
  • the second electrode layer 150 is formed on the array substrate, and patterned to form second electrodes 150 spaced apart and independent from each other.
  • the second electrodes 150 are located in the pixel area AA of the display panel 10 .
  • the pixel definition layer 160 is formed on the second electrode layer 150 , and is patterned to form pixel openings and light-transmitting holes 101 arranged at intervals.
  • the pixel opening is located in the pixel area AA and corresponds to the second electrode 150 and exposes the second electrode 150;
  • the light-transmitting hole 101 includes a top opening, a bottom opening, and a side wall connecting the top opening and the bottom opening.
  • the size of the top opening is larger than that of the bottom opening, and the outer edge of the side wall at the bottom opening is adjacent to the outer edge of the adjacent second electrode 150 .
  • the distance between the edges is 2-5 microns.
  • the light transmittance of the light-transmitting hole 101 area is improved, thereby improving the
  • the light transmittance of the first display area 11 increases the light transmittance of the display panel and improves the imaging effect of the under-screen camera.
  • the light emitting unit layer 170 is formed on the planarization layer 140 , the second electrode layer 150 and the pixel defining layer 160 , and the light emitting unit layer 170 includes a first light emitting unit layer 171 , a second light emitting unit layer 172 and a third light emitting unit layer 173 .
  • the first electrode layer 190 is a common electrode layer and the second electrode layer 150 is a pixel electrode layer
  • the first light-emitting unit layer 171 is a hole transport layer and the third light-emitting unit layer 173 is an electron transport layer
  • the first electrode layer 171 is a hole transport layer
  • the first light-emitting unit layer 171 is an electron transport layer and the third light-emitting unit layer 173 is a hole transport layer
  • 190 is an example of a common electrode layer and the second electrode layer 150 is a pixel electrode layer.
  • the hole transport layer is a material with high hole mobility, high thermal stability and good electron and exciton blocking ability.
  • the material of the hole transport layer is generally one or more of 2TNATA, NPB and TAPC.
  • the electron transport layer is a material with high electron mobility, high thermal stability and good hole and exciton blocking ability, and the material of the electron transport layer is one or more of TPBi, BPhen and TmPyPB.
  • the second light-emitting unit layer 172 is a light-emitting material layer, including a red light-emitting material layer, a green light-emitting material layer, and a blue light-emitting material layer, for emitting corresponding pixel colors.
  • the pixels include red pixels R, green pixel G and blue pixel B.
  • the structure of the pixel may be the structure shown in FIG.
  • the first light-emitting unit layer 171 may further be a composite film layer of a hole transport layer and a hole injection layer, and the hole injection layer is located between the hole transport layer and the light-emitting material.
  • the third light-emitting unit layer 173 may further be a composite film layer of an electron transport layer and an electron injection layer, and the electron injection layer is located between the electron transport layer and the light-emitting material layer.
  • the first light-emitting unit layer 171 is set as a whole layer, covers the pixel area AA and the light-transmitting area TA, is deposited on the pixel-defining layer 160 and covers the pixel opening and the light-transmitting hole of the pixel-defining layer 160 and is in contact with the second electrode 150;
  • the light-emitting unit layer 172 is disposed in the pixel opening, and is deposited on the first light-emitting unit layer 171 and corresponds to the corresponding second electrode 150;
  • the third light-emitting unit layer 173 is provided as a whole layer, covering the pixel area AA and the light-transmitting area TA , deposited on the first light-emitting unit layer 171 and the second light-emitting unit layer 172 .
  • the auxiliary layer 180 is disposed on the third light-emitting unit layer 173 , and is patterned to form auxiliary parts 180 that are spaced apart and independent from each other.
  • the auxiliary parts 180 are located in the corresponding light-transmitting holes 101 .
  • the distance between the edges is 2-5 microns, and the projection of the auxiliary portion 180 on the substrate 110 does not overlap with the projection of the second electrode 150 on the substrate.
  • the material of the auxiliary layer 180 is a transparent anti-adhesion material, specifically a material with weak adhesion to the first electrode layer 190 and a surface energy mismatch, including but not limited to N,N' -Diphenyl-N,N'-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4'-diamine, N-(biphenyl-4-yl)-9, 9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine, 2-(4-(9,10-bis( Naphthalen-2-yl)anthracene-2-yl)phenyl)-1-phenyl-1H-benzo-[D]imidazole, 4,4',4''-tris(N-3-methylphenyl) -N-phenylamino)triphenylamine,
  • the first electrode layer 190 is disposed on the third light-emitting unit layer 173 and covers at least the third light-emitting unit layer 173.
  • the first electrode layer 190 is a non-transparent electrode layer and has the function of reflecting the light emitted by the second light-emitting unit layer 172. At the same time, it has the function of blocking external light from entering the display panel 10 through the light-transmitting area TA.
  • the first electrode layer 190 is a common electrode layer, which may be made of a metal with low work function, including silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li) or calcium (Ca), preferably, the first electrode layer 190 is magnesium or Magnesium alloy metal layer.
  • a metal with low work function including silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li) or calcium (Ca)
  • the first electrode layer 190 is magnesium or Magnesium alloy metal layer.
  • the anti-adhesion material does not match the surface energy of the material of the first electrode layer 190
  • the material of the third light-emitting unit layer 173 is a non-adhesion-resistant material, which is different from the material of the first electrode layer 190 .
  • the surface energies are matched, so that the adhesion of the first electrode layer 190 on the auxiliary layer 180 is smaller than the adhesion of the first electrode layer 190 on the third light emitting unit layer 173, so the first electrode layer 190 located on the auxiliary layer 180 is smaller than the thickness of the first electrode layer 190 on the third light emitting unit layer 173 .
  • the adhesion of the first electrode layer 190 on the auxiliary layer 180 gradually decreases as the thickness of the auxiliary layer 180 increases, and when the thickness of the auxiliary layer 180 reaches a certain value d, the first electrode layer 190 on the auxiliary layer 180 When the adhesion on the auxiliary layer 180 reaches the limit value, the first electrode layer 190 cannot be attached to the auxiliary layer 180, that is, the first electrode layer 190 is not provided on the auxiliary layer 180 with a thickness greater than d. Therefore, the thickness of the auxiliary layer 180 can be controlled by controlling the thickness of the auxiliary layer 180.
  • the deposition thickness of the first electrode layer 190 on the auxiliary layer 180 is used to realize the removal of the corresponding part of the first electrode layer 190 or the thinning process of the first electrode layer 190 .
  • the thickness of the first electrode layer 190 on the third light emitting unit layer 173 is 100-150 nanometers, and the thickness of the auxiliary layer 180 is less than or equal to the thickness of the first electrode layer on the third light emitting unit layer 173 190 thickness.
  • the auxiliary part 180 is provided on the third light-emitting unit layer 173 in the light-transmitting hole 101, and the material of the auxiliary part 180 is not matched with the surface energy of the material of the first electrode layer 190, so as to reduce the thickness or reduce the thickness.
  • the function of the first electrode layer 190 on the auxiliary part 180 is removed, and the light transmittance of the light-transmitting hole 101 area is further improved, thereby improving the light transmittance of the first display area 11 and the display panel.
  • the auxiliary portion 180 covers the bottom opening of the corresponding light-transmitting hole 101
  • the auxiliary portion 180 includes a platform portion and an edge portion located at the edge of the platform portion, and the thickness of the edge portion is along the distance away from the platform portion.
  • the direction of the platform part gradually decreases
  • the first electrode layer 190 covers the light emitting unit layer and at least part of the auxiliary part 180
  • the thickness of the first electrode layer 190 on the auxiliary part 180 gradually decreases as the thickness of the auxiliary part 180 increases.
  • the thickness of the platform part of the auxiliary part 180 is greater than d, and the first electrode layer 190 covers the third light emitting unit layer 173 and part of the edge part; in another embodiment, the thickness of the platform part of the auxiliary part 180 The thickness is equal to d, and the first electrode layer 190 covers the third light-emitting unit layer 173 and the entire edge portion; in yet another embodiment, the thickness of the platform portion of the auxiliary portion 180 is less than d, and the first electrode layer 190 covers the third light-emitting unit layer 173 and the entire auxiliary layer 180 .
  • the first electrode layer 190 completely covers the third light-emitting unit layer 173 in the light-transmitting hole 101 , that is, the first electrode layer 190 covers the side of the light-transmitting hole 101 , and the first electrode layer 190 is located on the side of the light-transmitting hole 101 .
  • An electrode layer 190 improves the reflection of light emitted from the display panel by the transparent area, reduces the brightness of the transparent area, reduces the brightness difference between the first display area and the second display area, and improves the brightness uniformity of the display panel .
  • the auxiliary part 180 covers the bottom opening and at least part of the sidewall of the corresponding light-transmitting hole 101 , and the auxiliary part 180 includes a bottom covering the bottom opening and a side part covering the sidewall,
  • the first electrode layer 190 covers the light emitting unit layer and at least part of the auxiliary part 180 , and the thickness of the first electrode layer 190 on the auxiliary part 180 gradually decreases as the thickness of the auxiliary part 180 increases.
  • the thickness of the bottom of the auxiliary part 180 is greater than or equal to d, and the first electrode layer 190 covers the third light emitting unit layer 173 and part of the side parts; in another embodiment, the thickness of the bottom of the auxiliary part 180 Less than d, the first electrode layer 190 covers the third light emitting unit layer 173 and the entire auxiliary layer 180 .
  • this embodiment enlarges the area of the auxiliary part 180 , enlarges the area of the thinned or removed part of the first electrode layer 190 , and further improves the light transmittance of the area of the light transmission hole 101 , thereby improving the The transmittance of the first display area 11 .
  • the first electrode layer 190 covers at least part of the side of the light-transmitting hole 101 , and the first electrode layer 190 located on the side of the light-transmitting hole 101 improves the reflection of light emitted from the display panel by the light-transmitting area, reducing the The brightness of the light-transmitting area is reduced, the brightness difference between the first display area and the second display area is reduced, and the brightness uniformity of the display panel is improved.
  • the display panel provided by the embodiment of the present application further includes a transparent filling layer 200 , the transparent filling layer 200 is filled in the light-transmitting hole 101 and located on the first electrode layer 190 , and the transparent filling layer 200 is filled with transparent filling.
  • the upper surface of the layer 200 is flush with the upper surface of the first electrode layer 190 outside the light-transmitting hole 101 .
  • the material of the transparent filling layer is a transparent organic material with a light transmittance greater than 95%, including but not limited to polymethyl methacrylate.
  • the subsequent film layer forms a step difference at the position of the light-transmitting hole 101 , which is not conducive to the preparation of the subsequent film layer.
  • the filling layer 200 plays the role of flattening the display panel on the premise of ensuring the light transmittance of the light-transmitting hole 101 area.
  • the display panel provided by the embodiment of the present application further includes a transparent auxiliary electrode layer 210 , and the transparent auxiliary electrode layer 210 is disposed on the first electrode layer 190 and at least completely covers the auxiliary electrode layer 210 .
  • the layer 180 is electrically connected to the first electrode layer 190, and is used to assist the first electrode layer 190 to provide electrical signals for the display panel, reduce the resistivity of the first electrode layer 190, and reduce the light transmittance of the display panel within the light transmission area.
  • the conductivity of the display panel is increased, and the voltage drop of the display panel is reduced.
  • the material of the transparent auxiliary electrode layer 210 is a transparent conductive material, including but not limited to indium tin oxide, indium zinc oxide, aluminum oxide tin, aluminum oxide zinc, indium gallium zinc oxide, metals or alloys less than 60 angstroms.
  • the thickness of the transparent auxiliary electrode layer 210 is 20-200 nm.
  • the refractive index of the transparent auxiliary electrode layer 210 is in the range of 1.8-2.1.
  • the transparent auxiliary electrode layer 210 is disposed on the entire surface, and the transparent auxiliary electrode layer 210 completely covers the first electrode layer 190 and the auxiliary layer 180 .
  • the transparent auxiliary electrode layer 210 is in contact with the first electrode layer 190, and the transparent auxiliary electrode layer 210, as a part of the first electrode, provides electrical signals for the display panel together with the first electrode layer 190, which is equivalent to the transparent auxiliary electrode layer 210.
  • the thickness of the first electrode is increased, including the thickness of the first electrode on the auxiliary layer 180 and the thickness of the first electrode in other areas outside the auxiliary layer 180, which improves the conductivity of the entire first electrode, thereby improving the conductivity of the display panel.
  • the display panel may further include a protective layer, the protective layer is disposed in the pixel area AA, between the first electrode layer 190 and the transparent auxiliary electrode layer 210 at intervals, and corresponds to the pixel area AA where the protective layer is located.
  • the material of the luminescent material layer 172, the material of the protective layer is a transparent high temperature resistant material, including but not limited to silicon oxide, silicon nitride and silicon oxynitride, the protective layer avoids the high temperature in the preparation process of the transparent auxiliary electrode layer 210. If damaged, the light-emitting material layer 172 is protected, and the light-emitting quality of the display panel is guaranteed.
  • the transparent auxiliary electrode layer 210 includes a plurality of transparent auxiliary electrodes 210 arranged at intervals, and each transparent auxiliary electrode 210 completely covers the corresponding auxiliary part 180 and is located on the corresponding auxiliary part 180 the first electrode layer 190.
  • this embodiment makes up for the thinned or removed first electrode layer in the light-transmitting area, improves the conductivity of the first electrode, thereby improves the conductivity of the display panel, reduces the voltage drop of the display panel, and Compared with the previous embodiment, this embodiment reduces the area of the transparent auxiliary electrode layer and reduces the material cost of the auxiliary electrode layer.
  • the transparent auxiliary electrode 210 extends to the periphery of the auxiliary part 180, covering part of the first electrode layer 190 on the third light-emitting unit layer 173, and the distance from the transparent auxiliary electrode 210 extending from the auxiliary part 180 is 2-5 ⁇ m, that is, the transparent auxiliary electrode
  • the distance between the edge of 210 and the edge of the corresponding auxiliary portion 180 is 2-5 microns. This ensures good contact between the transparent auxiliary electrode 210 and the first electrode layer 190 , and avoids poor electrical contact that may be caused by the transparent auxiliary electrode 210 only in contact with the first electrode layer 190 on the auxiliary portion 180 .
  • the display panel provided by the embodiment of the present application further includes a transparent filling layer 200 and a transparent auxiliary electrode layer 210 , and the transparent auxiliary electrode layer 210 is provided on the first electrode layer 190 , at least completely Covers the auxiliary layer 180 and is electrically connected to the first electrode layer 190, and is used to assist the first electrode layer 190 to provide electrical signals for the display panel, reduce the resistivity of the first electrode layer 190, and allow the display panel to transmit light in the light-transmitting area without affecting the light-transmitting area.
  • the conductivity of the display panel is increased, and the voltage drop of the display panel is reduced.
  • the material of the transparent auxiliary electrode layer 210 is a transparent conductive material, including but not limited to indium tin oxide, indium zinc oxide, aluminum oxide tin, aluminum oxide zinc, indium gallium zinc oxide, metals or alloys less than 60 angstroms.
  • the thickness of the transparent auxiliary electrode layer 210 is 20-200 nm.
  • the refractive index of the transparent auxiliary electrode layer 210 is in the range of 1.8-2.1.
  • the transparent filling layer 200 is filled in the transparent hole 101 and located on the transparent auxiliary electrode layer 210 .
  • the material of the transparent filling layer 200 is a transparent organic material with a light transmittance greater than 95%, including but not limited to polymethyl methacrylate.
  • the transparent filling layer 200 plays a role of flattening the display panel under the premise of ensuring the light transmittance of the light-transmitting hole 101 area.
  • the transparent filling layer 200 may refer to the embodiment shown in FIG. 4
  • the transparent auxiliary electrode layer 210 may refer to the embodiment shown in FIG. 5 and FIG. 6 , which will not be repeated here.
  • An embodiment of the present application further provides a method for preparing a display panel, which is used for preparing the display panel provided by any one of the embodiments of the present application, and the preparation method includes:
  • a layer of pixel definition layer film is prepared on the second electrode, and a set of fine masks is used to pattern the pixel definition layer film, and at the same time, pixel openings located in the pixel area and transparent areas located in the light transmission area are formed.
  • light hole wherein, the pixel opening is located in the pixel area and corresponds to the second electrode and exposes the second electrode; the light-transmitting hole is located in the light-transmitting area.
  • the light-transmitting hole includes a top opening, a bottom opening, and a side wall connecting the top opening and the bottom opening, the size of the top opening is larger than the size of the bottom opening, and the outer edge of the side wall at the bottom opening and the outer edge of the adjacent second electrode are located. The distance between them is 2-5 microns.
  • a first light-emitting unit layer is vapor-deposited on the pixel definition layer, the first light-emitting unit layer is provided in the whole layer, covers the pixel area and the light-transmitting area, and is deposited on the pixel-defining layer to cover the openings and light-transmitting holes of the pixel-defining layer and contact with the second electrode;
  • a second light-emitting unit layer is evaporated on the first light-emitting unit layer in the pixel area, the second light-emitting unit layer corresponds to the second electrode in the pixel area where it is located, and the second light-emitting unit layer is a light-emitting material layer, including a red light emitting material layer, a green light emitting material layer and a blue light emitting material layer;
  • a third light emitting unit layer is evaporated on the first light emitting unit layer and the second light emitting unit layer, and the third light emitting unit layer is set in the whole layer , covering the pixel area and the light-transmitting area.
  • a set of fine masks is used to prepare an auxiliary layer on the third light-emitting unit layer to form auxiliary parts that are spaced apart and independent from each other, and the auxiliary parts are located in the corresponding light-transmitting holes.
  • the distance between the edge of the auxiliary part and the edge of the adjacent pixel area is 2-5 microns, the projection of the auxiliary part on the plane where the second electrode is located does not overlap with the second electrode, and the material of the auxiliary layer is transparent
  • the adhesion material is specifically a material with weak adhesion to the first electrode layer and a surface energy mismatch.
  • a first electrode layer is deposited on the third light-emitting unit layer, and the first electrode layer covers at least part of the third light-emitting unit layer and the auxiliary portion. Since the material of the auxiliary layer is an anti-adhesion material, the anti-adhesion material does not match the surface energy of the material of the first electrode layer, while the material of the third light-emitting unit layer is a non-anti-adhesion material, which matches the surface energy of the material of the first electrode layer.
  • the adhesion of the first electrode layer on the auxiliary layer is smaller than the adhesion of the first electrode layer on the third light-emitting unit layer, and the thickness of the first electrode layer on the auxiliary layer is smaller than that on the third light-emitting unit layer. Thickness of the first electrode layer.
  • An embodiment of the present application provides a method for fabricating a display panel.
  • a pixel definition layer is patterned to form a light-transmitting hole in a light-transmitting area, and the pixel-defining layer in the light-transmitting hole is removed to improve light transmission.
  • the light transmittance of the hole area is improved, thereby improving the light transmittance of the first display area, improving the light transmittance of the display panel, and improving the imaging effect of the under-screen camera.
  • the preparation method of the display panel provided by the embodiment of the present application may further include: preparing a transparent auxiliary electrode layer on the first electrode layer, the transparent auxiliary electrode layer at least completely covering the auxiliary layer and electrically connected to the first electrode layer.
  • the material of the transparent auxiliary electrode layer is a transparent conductive material, including but not limited to indium tin oxide, indium zinc oxide, aluminum oxide tin, aluminum oxide zinc, indium gallium zinc oxide, metals or alloys smaller than angstroms.
  • the thickness of the transparent auxiliary electrode layer is 20-200 nm.
  • the refractive index of the transparent auxiliary electrode layer is in the range of 1.8-2.1.
  • the transparent auxiliary electrode layer assists the first electrode layer to provide electrical signals for the display panel, reduces the resistivity of the first electrode layer, and improves the electrical conductivity of the display panel on the premise of not affecting the light transmittance of the display panel in the light-transmitting area. Reduced voltage drop across the display panel.
  • the preparation method of the display panel provided by the embodiment of the present application may further include: preparing a transparent filling layer on the first electrode layer or the transparent auxiliary electrode layer, the transparent filling layer is filled in the light-transmitting hole, and the upper surface of the transparent filling layer is The upper surface of the first electrode layer or the transparent auxiliary electrode layer outside the light-transmitting hole is flush.
  • the material of the transparent filling layer is a transparent organic material with a light transmittance greater than 95%, including but not limited to polymethyl methacrylate.
  • the transparent filling layer plays the role of flattening the display panel under the premise of ensuring the light transmittance of the light-transmitting hole area.
  • the present application further provides a display device
  • the display device includes any of the display panels provided by the embodiments of the present application, and has the technical features and technical effects of any of the display panels provided by the embodiments of the present application , please refer to the above-mentioned specific embodiment for the specific implementation manner and working principle, which will not be repeated here.
  • the embodiments of the present application provide a display panel, a method for manufacturing the same, and a display device.
  • the display panel removes the pixel definition layer in the light transmission hole by arranging light transmission holes in the light transmission area of the pixel definition layer. , the light transmittance of the light-transmitting hole area is improved, thereby improving the light transmittance of the first display area, the light transmittance of the display panel, and the imaging effect of the under-screen camera.

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Abstract

一种显示面板及显示装置，显示面板包括第一显示区（11）和第二显示区（12），第一显示区（11）的透光率大于第二显示区（12）的透光率，在第一显示区（11）内，显示面板包括像素区和位于像素区之间的透光区，显示面板包括：像素定义层（160），设有至少一个透光孔（101），透光孔（101）位于对应的透光区内；辅助层（180），位于透光孔内（101）；第一电极层（190），位于辅助层（180）之上。

Description

显示面板及显示装置 技术领域
本申请涉及显示领域，具体涉及一种显示面板及显示装置。
 背景技术
在现有技术屏下摄像显示技术（Camera Under Panel，CUP）中，显示面板包括既用于显示又用于拍摄的第一显示区和仅用于显示的第二显示区，为了提升屏下摄像头的拍摄效果，需要提高该第一显示区内显示面板的透光率。
 技术问题
本申请实施例提供一种显示面板及显示装置，可以提高显示面板的透光率，提升了屏下摄像头的成像效果。
 技术解决方案
本申请实施例提供一种显示面板，包括第一显示区和第二显示区，所述第一显示区的透光率大于所述第二显示区的透光率，在所述第一显示区内，所述显示面板包括像素区和位于所述像素区之间的透光区，所述显示面板包括：
像素定义层，设有至少一个透光孔，所述透光孔位于对应的所述透光区内；
辅助层，包括至少一个辅助部，所述辅助部位于对应的所述透光孔内；以及
第一电极层，位于所述辅助层之上。
可选的，在本申请的一些实施例中，所述透光孔包括顶部开口、底部开口和侧壁，所述顶部开口的尺寸大于所述底部开口的尺寸。
可选的，在本申请的一些实施例中，所述显示面板还包括第二电极层，所述像素定义层设于所述第二电极层上，所述第二电极层包括多个第二电极，每一所述第二电极位于对应的所述像素区内，所述侧壁在所述底部开口处的外边缘与相邻的所述第二电极的外边缘之间的距离为2-5微米。
可选的，在本申请的一些实施例中，所述显示面板还包括发光单元层，所述发光单元层包括层叠设置的第一发光单元层、第二发光单元层和第三发光单元层，所述第二发光单元层设置于所述第一发光单元层和所述第三发光单元层之间，所述像素定义层还包括对应于所述第二电极的像素开口，所述第一发光单元层设置于所述像素定义层上覆盖所述像素开口和所述透光孔且位于所述辅助层之下，所述第二发光单元层设置于所述像素开口内，所述第三发光单元层覆盖所述第二发光单元层和所述第一发光单元层且位于所述辅助层之下。
可选的，在本申请的一些实施例中，所述第一电极层覆盖所述第三发光单元层和所述辅助部的至少部分区域。
可选的，在本申请的一些实施例中，位于所述辅助层上的所述第一电极层的厚度小于位于所述发光单元层上的所述第一电极层的厚度。
可选的，在本申请的一些实施例中，所述辅助部覆盖对应的所述透光孔的所述底部开口。
可选的，在本申请的一些实施例中，所述辅助部包括平台部和位于所述平台部边缘的边缘部，所述边缘部的厚度沿远离所述平台部的方向逐渐减小，所述第一电极层至少覆盖部分所述边缘部。
可选的，在本申请的一些实施例中，所述第一电极层的厚度在所述边缘部上沿所述边缘部厚度增大的方向逐渐减小。
可选的，在本申请的一些实施例中，所述第一电极层覆盖部分所述边缘部。
可选的，在本申请的一些实施例中，所述第一电极层覆盖整个所述边缘部。
可选的，在本申请的一些实施例中，所述第一电极覆盖整个所述辅助层。
可选的，在本申请的一些实施例中，所述辅助层还覆盖部分所述透光孔的侧壁。
可选的，在本申请的一些实施例中，所述显示面板还包括透明填充层，所述透明填充层填充于所述透光孔内且位于所述第一电极层上。
可选的，在本申请的一些实施例中，所述透明填充层的材料为透光率大于95%的透明有机材料。
可选的，在本申请的一些实施例中，所述透明有机材料包括聚甲基丙烯酸甲酯。
相应的，本申请实施例还提供一种显示装置，包括显示面板，所述显示面板包括第一显示区和第二显示区，所述第一显示区的透光率大于所述第二显示区的透光率，在所述第一显示区内，所述显示面板包括像素区和位于所述像素区之间的透光区，所述显示面板包括：
像素定义层，设有至少一个透光孔，所述透光孔位于对应的所述透光区内；
辅助层，包括至少一个辅助部，所述辅助部位于对应的所述透光孔内；以及
第一电极层，位于所述辅助层之上。
可选的，在本申请的一些实施例中，所述透光孔包括顶部开口、底部开口和侧壁，所述顶部开口的尺寸大于所述底部开口的尺寸。
可选的，在本申请的一些实施例中，所述显示面板还包括第二电极层，所述像素定义层设于所述第二电极层上，所述第二电极层包括多个第二电极，每一所述第二电极位于对应的所述像素区内，所述侧壁在所述底部开口处的外边缘与相邻的所述第二电极的外边缘之间的距离为2-5微米。
可选的，在本申请的一些实施例中，所述显示面板还包括透明填充层，所述透明填充层填充于所述透光孔内且位于所述第一电极层上。
 有益效果
本申请实施例提供了一种显示面板及显示装置，该显示面板包括第一显示区和第二显示区，所述第一显示区的透光率大于所述第二显示区的透光率，在所述第一显示区内，所述显示面板包括像素区和位于所述像素区之间的透光区，所述显示面板包括：像素定义层，设有至少一个透光孔，所述透光孔位于对应的所述透光区内；辅助层，包括至少一个辅助部，所述辅助部位于对应的所述透光孔内；以及第一电极层，位于所述辅助层之上。本申请实施例通过在像素定义层的透光区内设置透光孔，去除掉透光孔内的像素定义层，提高了透光孔区域的透光率，从而提高了第一显示区的透光率，提高了显示面板的透光率，提升了屏下摄像头的成像效果。
 附图说明
下面结合附图，通过对本申请的具体实施方式详细描述，将使本申请的技术方案及其它有益效果显而易见。
图1是本申请实施例提供的显示面板的第一种平面结构示意图；
图2是本申请实施例提供的显示面板的第二种平面结构示意图；
图3是本申请实施例提供的显示面板的第一种剖面结构示意图；
图4是本申请实施例提供的显示面板的第二种剖面结构示意图；
图5是本申请实施例提供的显示面板的第三种剖面结构示意图；
图6是本申请实施例提供的显示面板的第四种剖面结构示意图；
图7是本申请实施例提供的显示面板的第五种剖面结构示意图；
图8是本申请实施例提供的显示面板的第六种剖面结构示意图。
 本发明的实施方式
针对现有AMOLED On-cell显示屏存在触控报点率低的问题，本申请提供一种OLED显示面板可以缓解这个问题。
本申请实施例提供一种显示面板及其制备方法、显示装置，提高了显示面板的透光率，提升了屏下摄像头的成像效果。以下分别进行详细说明。需说明的是，以下实施例的描述顺序不作为对实施例优选顺序的限定。
在一种实施例中，请参照图1至图8，图1示出了本申请实施例提供的显示面板的第一种平面结构示意图；图2示出了本申请实施例提供的显示面板的第二种平面结构示意图，具体为本申请实施例提供的显示面板的第一显示区的局部平面结构示意图；图3示出了本申请实施例提供的显示面板的第一种剖面结构示意图，具体为本申请实施例提供的显示面板的第一显示区的局部剖面结构示意图，即图2中沿aa线的剖面结构示意图；图4示出了本申请实施例提供的显示面板的第二种剖面结构示意图；图5示出了本申请实施例提供的显示面板的第三种剖面结构示意图；图6示出了本申请实施例提供的显示面板的第四种剖面结构示意图；图7示出了本申请实施例提供的显示面板的第五种剖面结构示意图；图8示出了本申请实施例提供的显示面板的第六种剖面结构示意图。如图所示，本申请实施例提供的显示面板10包括第一显示区11和第二显示区12，第一显示区11的透光率大于第二显示区12的透光率，在第一显示区11内，显示面板10包括像素区AA和位于像素区之间的透光区TA。显示面板10包括像素定义层160、辅助层180和第一电极层190。其中，像素定义层160上设置有至少一个透光孔101，透光孔101位于对应的透光区TA内；辅助层180包括至少一个辅助部180，辅助部180位于对应的透光孔TA内；第一电极层190位于辅助层180之上。
本申请实施例提供了一种显示面板，该显示面板通过在像素定义层的透光区内设置透光孔，去除掉透光孔内的像素定义层，提高了透光孔区域的透光率，从而提高了第一显示区的透光率，提高了显示面板的透光率，提升了屏下摄像头的成像效果。
下面将以具体的实施例结合附图对本申请实施例提供的显示面板作进一步的解释说明，下述实施例仅在于对本申请提供的显示面板进行举例说明，不在于限制本申请提供的显示面板，任何符合本申请发明构思的显示面板均在本申请保护的范围之内。
在一种实施例中，如图3所示，本申请实施例提供的显示面板具体包括阵列基板、第二电极层150、像素定义层160、发光单元层170、辅助层180和第一电极层190。
阵列基板又包括从下到上依次设置的衬底110、半导体有源层121、第一绝缘层131、第一栅极层122、第二绝缘层132、第二栅极层123、第三绝缘层133、源漏极层124和平坦化层140。其中，衬底110可以是刚性衬底或者柔性衬底，刚性衬底一般为玻璃衬底，柔性衬底通常包括第一有机衬底、无机衬底、以及第二无机衬底。半导体有源层121图案化形成薄膜晶体管的有源区，半导体有源层121的材料可以是氧化物半导体材料，也可以是多晶硅材料或单晶硅材料。第一栅极层122图案化形成薄膜晶体管的第一栅极，第二栅极层123图案化形成薄膜晶体管的第二栅极。源漏极层124图案化形成薄膜晶体管的源极和漏极。薄膜晶体管以及信号线共同构成显示面板10的驱动电路，用于驱动发光单元层170进行发光显示。第一绝缘层131设置于半导体有源层121和第一栅极层122之间，第二绝缘层132设置于第一栅极层122和第二栅极层123之间，第三绝缘层133设置于第二栅极层123和源漏极层124之间，第一绝缘层131、第二绝缘层132和第三绝缘层133分别用于隔绝与其相邻的两导电层。平坦化层140用于平坦化阵列基板，为平坦化层140上的第二电极层150的制备提供平坦的基底，平坦化层140的材料一般为有机物。
第二电极层150形成于阵列基板上，图案化形成彼此间隔设置且相互独立的第二电极150，第二电极150位于显示面板10的像素区AA内。
像素定义层160形成于第二电极层150上，图案化形成间隔设置的像素开口和透光孔101。其中，像素开口位于像素区AA内对应于第二电极150且露出第二电极150；透光孔101位于透光区TA内且贯穿像素定义层160暴露出平坦化层140。透光孔101包括顶部开口、底部开口和连接顶部开口和底部开口的侧壁，顶部开口的尺寸大于底部开口的尺寸，侧壁在底部开口处的外边缘与相邻的第二电极150的外边缘之间的距离为2-5微米。本申请实施例通过在像素定义层160的透光区TA内设置透光孔101，去除掉透光孔101内的像素定义层160，提高了透光孔101区域的透光率，从而提高了第一显示区11的透光率，提高了显示面板的透光率，提升了屏下摄像头的成像效果。
发光单元层170形成于平坦化层140、第二电极层150和像素定义层160上，发光单元层170包括第一发光单元层171、第二发光单元层172和第三发光单元层173。当第一电极层190为公共电极层且第二电极层150为像素电极层时，第一发光单元层171为空穴传输层且第三发光单元层173为电子传输层；当第一电极层190为像素电极层且第二电极层150为公共电极层时，第一发光单元层171为电子传输层且第三发光单元层173为空穴传输层；本申请实施例以当第一电极层190为公共电极层且第二电极层150为像素电极层为例。空穴传输层为具备高的空穴迁移率、高的热稳定性和良好的电子和激子阻挡能力的材料。空穴传输层的材料一般为2TNATA、NPB、TAPC中的一种或几种。电子传输层为具备高的电子迁移率、高的热稳定性和良好的空穴和激子阻挡能力的材料，电子传输层的材料为TPBi、BPhen、TmPyPB中的一种或几种。第二发光单元层172为发光材料层，包括红光发光材料层、绿光发光材料层和蓝光发光材料层，用于发射对应的像素颜色，如图2所示，像素包括红色像素R、绿色像素G和蓝色像素B。在本申请实施例中，像素的结构可以是如图2所示的结构，也可以是本领域所熟知的其他结构，在此不做限定。为了能够提高电子和空穴注入发光材料层的效率，第一发光单元层171进一步还可以是空穴传输层和空穴注入层的复合膜层，空穴注入层位于空穴传输层和发光材料层之间；第三发光单元层173进一步还可以是电子传输层和电子注入层的复合膜层，电子注入层位于电子传输层和发光材料层之间。第一发光单元层171为整层设置，覆盖像素区AA和透光区TA，沉积于像素定义层160上覆盖像素定义层160的像素开口和透光孔且与第二电极150接触；第二发光单元层172设置于像素开口内，沉积于第一发光单元层171上且对应于与其对应的第二电极150；第三发光单元层173为整层设置，覆盖像素区AA和透光区TA，沉积于第一发光单元层171和第二发光单元层172上。
辅助层180设置于第三发光单元层173上，图案化形成相互间隔且彼此独立的辅助部180，辅助部180位于对应的透光孔101内，辅助部180的边缘与相邻像素区AA的边缘之间的距离为2-5微米，辅助部180在衬底110上的投影与第二电极150在衬底上的投影不存在重叠。在本申请实施例提供的显示面板中，辅助层180的材料为透明的防附着材料，具体为与第一电极层190附着力弱、表面能不匹配的材料，包括但不限于N,N'-二苯基-N,N'-二(9-苯基-9H-咔唑-3-基)联苯-4,4'-二胺、N-(联苯-4-基)-9,9-二甲基-N-(4-(9-苯基-9H-咔唑-3-基)苯基)-9H-芴-2-胺、2-(4-(9,10-二(萘-2-基)蒽-2-基)苯基)-1-苯基-1H-苯并-[D]咪唑、4,4',4''-三(N-3-甲基苯基-N-苯基氨基)三苯胺、N,N'-二(1-萘基)-N,N'-二苯基[1,1'-联苯基]-4,4'-二胺或4,4'-二[N-(3-甲基苯基)-N-苯基氨基]联苯、BAlq(双(2-甲基-8-羟基喹啉)-4-(对苯基苯酚)合铝)、TAZ(3-(联苯-4-基)-5-(4-叔丁基苯基)-4-苯基-4H-1,2,4-三唑)。
第一电极层190设置于第三发光单元层173上且至少覆盖第三发光单元层173，第一电极层190为非透明电极层，具有反射第二发光单元层172发射出的光线的作用，同时具有阻挡外界光线透过透光区TA进入显示面板10的作用。在一种实施例中，第一电极层190为公共电极层，可由具有低逸出功的金属制成，包括银（Ag）、镁（Mg）、铝（Al）、铂（Pt）、钯（Pd）、金（Au）、镍（Ni）、钕（Nd）、铱（Ir）、铬（Cr）、锂（Li）或钙（Ca），优选的，第一电极层190为镁或镁合金金属层。
由于辅助层180的材料为防附着材料，防附着材料与第一电极层190的材料表面能不匹配，而第三发光单元层173的材料为非防附着材料，与第一电极层190的材料表面能相匹配，这样，第一电极层190在辅助层180上的附着力小于第一电极层190在第三发光单元层173上的附着力，因此位于辅助层180上的第一电极层190的厚度小于位于第三发光单元层173上的第一电极层190的厚度。又由于第一电极层190在辅助层180上的附着力随着辅助层180厚度增大而逐渐减小，且当辅助层180的厚度达到一定值d时，第一电极层190在辅助层180上的附着力达到极限值，第一电极层190将无法在辅助层180上附着，即在厚度大于d的辅助层180上无第一电极层190设置，因此通过控制辅助层180的厚度可以控制第一电极层190在辅助层180上的沉积厚度，从而实现对第一电极层190相应部分的去除或对第一电极层190进行薄化处理。在本申请实施例中，位于第三发光单元层173上的第一电极层190的厚度为100-150纳米，辅助层180的厚度小于或等于位于第三发光单元层173上的第一电极层190的厚度。
本申请实施例通过在透光孔101内的第三发光单元层173上设置辅助部180，利用辅助部180的材料与第一电极层190的材料表面能不匹配的特性，起到减薄或去除了辅助部180上第一电极层190的作用，进一步提高了透光孔101区域的透光率，从而提高了第一显示区11的透光率，提高了显示面板的透光率，提升了屏下摄像头的成像效果。
在一种实施例中，如图3所示，辅助部180覆盖对应的透光孔101的底部开口，辅助部180包括平台部和位于所述平台部边缘的边缘部，边缘部的厚度沿远离平台部的方向逐渐减小，第一电极层190覆盖发光单元层和至少部分辅助部180，且辅助部180上第一电极层190的厚度随着辅助部180厚度增大而逐渐减小。在一种实施方案中，辅助部180的平台部的厚度大于d，第一电极层190覆盖第三发光单元层173和部分边缘部；在另一种实施方案中，辅助部180的平台部的厚度等于d，第一电极层190覆盖第三发光单元层173和整个边缘部；在又一种实施方案中，辅助部180的平台部的厚度小于d，第一电极层190覆盖第三发光单元层173和整个辅助层180。在本实施例中，第一电极层190完全覆盖透光孔101内第三发光单元层173，即第一电极层190覆盖透光孔101的侧边，位于透光孔101侧边上的第一电极层190提高了透光区对显示面板发射光线的反射，减小了透光区的亮度，减小了第一显示区和第二显示区的亮度差异，提高了显示面板的亮度均一性。
在另一种实施例中，如图4所示，辅助部180覆盖对应的透光孔101的底部开口和至少部分侧壁，辅助部180包括覆盖底部开口的底部和覆盖侧壁的侧部，第一电极层190覆盖发光单元层和至少部分辅助部180，且辅助部180上第一电极层190的厚度随着辅助部180厚度增大而逐渐减小。在一种实施方案中，辅助部180的底部的厚度大于等于d，第一电极层190覆盖第三发光单元层173和部分侧部；在另一种实施方案中，辅助部180的底部的厚度小于d，第一电极层190覆盖第三发光单元层173和整个辅助层180。本实施例相比于上一实施例，扩大了辅助部180的面积，扩大了第一电极层190减薄或去除部分的面积，进一步提高了透光孔101区域的透光率，从而提高了第一显示区11的透光率。在本实施例中，第一电极层190覆盖透光孔101的至少部分侧边，位于透光孔101侧边上的第一电极层190提高了透光区对显示面板发射光线的反射，减小了透光区的亮度，减小了第一显示区和第二显示区的亮度差异，提高了显示面板的亮度均一性。
在一种实施例中，如图5所示，本申请实施例提供的显示面板还包括透明填充层200，透明填充层200填充于透光孔101内且位于第一电极层190上，透明填充层200的上表面与透光孔101外第一电极层190的上表面平齐。透明填充层的材料为透光率大于95%的透明有机材料，包括但不限于聚甲基丙烯酸甲酯。由于透光孔101贯穿像素定义层160，使得后续膜层在透光孔101位置处形成段差，不利于后续膜层的制备，因此，在透光孔101内设置透光率大于95%的透明填充层200，在保证透光孔101区域透光率的前提下，起到平坦化显示面板的作用。
在一种实施例中，如图6和图7所示，本申请实施例提供的显示面板还包括透明辅助电极层210，透明辅助电极层210设于第一电极层190上，至少完全覆盖辅助层180且与第一电极层190电连接，用于辅助第一电极层190为显示面板提供电信号，降低第一电极层190的电阻率，在不影响透光区内显示面板透光率的前提下，提高显示面板的电导率，降低显示面板的压降。透明辅助电极层210的材料为透明导电材料，包括但不限于氧化铟锡、氧化铟锌、氧化铝锡、氧化铝锌、氧化铟镓锌、小于60埃的金属或合金。透明辅助电极层210的厚度为20-200纳米。透明辅助电极层210的折射率范围为1.8-2.1。
在一种实施方案中，如图6所示，透明辅助电极层210整面设置，透明辅助电极层210完全覆盖第一电极层190和辅助层180。这样，透明辅助电极层210与第一电极层190贴合接触，透明辅助电极层210作为第一电极的一部分，与第一电极层190共同为显示面板提供电信号，相当于透明辅助电极层210增大了第一电极的厚度，包括辅助层180上第一电极的厚度和辅助层180外其他区域第一电极的厚度，提高了整个第一电极的电导率，从而提高了显示面板的电导率，降低了显示面板的压降。在本实施方案的基础上，显示面板进一步还可以包括保护层，保护层间隔设置于像素区AA内、第一电极层190和透明辅助电极层210之间，且对应于其所在像素区AA内的发光材料层172，保护层的材料为透明耐高温材料，包括但不限于氧化硅、氮化硅和氮氧化硅，保护层避免了透明辅助电极层210制备过程中高温对发光材料层172的损坏，保护了发光材料层172，保证了显示面板的发光品质。
在另一种实施方案中，如图7所示，透明辅助电极层210包括多个间隔设置的透明辅助电极210，每一透明辅助电极210完全覆盖对应的辅助部180和位于对应辅助部180上的第一电极层190。同样的，本实施方案弥补了透光区内减薄或去除的第一电极层，提高了第一电极的电导率，从而提高了显示面板的电导率，降低了显示面板的压降，且相比于上一实施方案，本实施方案减小了透明辅助电极层的面积，降低了辅助电极层的材料成本。进一步，透明辅助电极210延伸至辅助部180外围，覆盖第三发光单元层上173的部分第一电极层190，透明辅助电极210延伸出辅助部180的距离为2-5微米，即透明辅助电极210的边缘与对应辅助部180的边缘之间的距离为2-5微米。这样保证了透明辅助电极210与第一电极层190良好接触，避免了由于透明辅助电极210仅与辅助部180上的第一电极层190接触可能造成的电接触不良。
在一种实施例中，如图8所示，本申请实施例提供的显示面板还包括透明填充层200和透明辅助电极层210，透明辅助电极层210设于第一电极层190上，至少完全覆盖辅助层180且与第一电极层190电连接，用于辅助第一电极层190为显示面板提供电信号，降低第一电极层190的电阻率，在不影响透光区内显示面板透光率的前提下，提高显示面板的电导率，降低显示面板的压降。透明辅助电极层210的材料为透明导电材料，包括但不限于氧化铟锡、氧化铟锌、氧化铝锡、氧化铝锌、氧化铟镓锌、小于60埃的金属或合金。透明辅助电极层210的厚度为20-200纳米。透明辅助电极层210的折射率范围为1.8-2.1。透明填充层200填充于透光孔101内且位于透明辅助电极层210上，透明填充层200的上表面与透光孔101外第一电极层190或透明辅助电极层210的上表面平齐。透明填充层200的材料为透光率大于95%的透明有机材料，包括但不限于聚甲基丙烯酸甲酯。透明填充层200在保证透光孔101区域透光率的前提下，起到平坦化显示面板的作用。本实施例中，透明填充层200可具体参照图4所示的实施例，透明辅助电极层210可具体参照图5和图6所示的实施例，在此不再赘述。
本申请实施例还提供一种显示面板的制备方法，用于制备本申请任意一种实施例提供的显示面板，该制备方法包括：
S1、制备像素定义层，图案化形成位于透光区内的透光孔。
具体的，在第二电极上制备一层像素定义层薄膜，采用一套精细掩膜版对像素定义层薄膜进行图案化处理，同时形成位于像素区内的像素开口和位于透光区内的透光孔。其中，像素开口位于像素区内对应于第二电极且露出第二电极；透光孔位于透光区内。透光孔包括顶部开口、底部开口和连接顶部开口和底部开口的侧壁，顶部开口的尺寸大于底部开口的尺寸，侧壁在底部开口处的外边缘与相邻的第二电极的外边缘之间的距离为2-5微米。
S2、在像素定义层上制备发光单元层。
具体的，在像素定义层上蒸镀第一发光单元层，第一发光单元层为整层设置，覆盖像素区和透光区，沉积于像素定义层上覆盖像素定义层的开口和透光孔且与第二电极接触；在像素区内第一发光单元层上蒸镀第二发光单元层，第二发光单元层对应于其所在像素区内的第二电极，第二发光单元层为发光材料层，包括红光发光材料层、绿光发光材料层和蓝光发光材料层；在第一发光单元层和第二发光单元层上蒸镀第三发光单元层，第三发光单元层为整层设置，覆盖像素区和透光区。
S3、在透光区内的发光单元层上制备辅助层。
具体的，采用一套精细掩膜版在第三发光单元层上制备辅助层，形成相互间隔且彼此独立的辅助部，辅助部位于对应的透光孔内。其中，辅助部的边缘与相邻像素区的边缘之间的距离为2-5微米，辅助部在第二电极所在平面上的投影与第二电极不存在重叠，辅助层的材料为透明的防附着材料，具体为与第一电极层附着力弱、表面能不匹配的材料。
S4、在发光单元层上制备第一电极层。
具体的，在第三发光单元层上沉积第一电极层，第一电极层覆盖第三发光单元层和辅助部至少部分区域。由于辅助层的材料为防附着材料，防附着材料与第一电极层的材料表面能不匹配，而第三发光单元层的材料为非防附着材料，与第一电极层的材料表面能相匹配，这样，第一电极层在辅助层上的附着力小于第一电极层在第三发光单元层上的附着力，位于辅助层上的第一电极层的厚度小于位于第三发光单元层上的第一电极层的厚度。
本申请实施例提供了一种显示面板的制备方法，该制备方法通过图案化处理像素定义层形成位于透光区内的透光孔，去除掉透光孔内的像素定义层，提高了透光孔区域的透光率，从而提高了第一显示区的透光率，提高了显示面板的透光率，提升了屏下摄像头的成像效果。
进一步，本申请实施例提供的显示面板的制备方法还可以包括：在第一电极层上制备透明辅助电极层，透明辅助电极层至少完全覆盖辅助层且与第一电极层电连接。透明辅助电极层的材料为透明导电材料，包括但不限于氧化铟锡、氧化铟锌、氧化铝锡、氧化铝锌、氧化铟镓锌、小于埃的金属或合金。透明辅助电极层的厚度为20-200纳米。透明辅助电极层的折射率范围为1.8-2.1。透明辅助电极层辅助第一电极层为显示面板提供电信号，降低了第一电极层的电阻率，在不影响透光区内显示面板透光率的前提下，提高了显示面板的电导率，降低了显示面板的压降。
进一步，本申请实施例提供的显示面板的制备方法还可以包括：在第一电极层或透明辅助电极层上制备透明填充层，透明填充层填充于透光孔内，透明填充层的上表面与透光孔外第一电极层或透明辅助电极层的上表面平齐。透明填充层的材料为透光率大于95%的透明有机材料，包括但不限于聚甲基丙烯酸甲酯。透明填充层在保证透光孔区域透光率的前提下，起到平坦化显示面板的作用。
在一种实施例中，本申请进一步提供一种显示装置，该显示装置包括本申请实施例提供的任意一种显示面板，具备本申请实施例提供的任意一种显示面板的技术特征和技术效果，具体实施方式及工作原理请参照上述具体实施例，在此不再赘述。
综上所述，本申请实施例提供一种显示面板及其制备方法、显示装置，该显示面板通过在像素定义层的透光区内设置透光孔，去除掉透光孔内的像素定义层，提高了透光孔区域的透光率，从而提高了第一显示区的透光率，提高了显示面板的透光率，提升了屏下摄像头的成像效果。
以上对本申请实施例所提供的一种显示面板及显示装置进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (20)

  1. 一种显示面板，其包括第一显示区和第二显示区，所述第一显示区的透光率大于所述第二显示区的透光率，在所述第一显示区内，所述显示面板包括像素区和位于所述像素区之间的透光区，所述显示面板包括：
    像素定义层，设有至少一个透光孔，所述透光孔位于对应的所述透光区内；
    辅助层，包括至少一个辅助部，所述辅助部位于对应的所述透光孔内；以及
    第一电极层，位于所述辅助层之上。
  2. 如权利要求1所述的显示面板，其中，所述透光孔包括顶部开口、底部开口和侧壁，所述顶部开口的尺寸大于所述底部开口的尺寸。
  3. 如权利要求2所述的显示面板，其中，所述显示面板还包括第二电极层，所述像素定义层设于所述第二电极层上，所述第二电极层包括多个第二电极，每一所述第二电极位于对应的所述像素区内，所述侧壁在所述底部开口处的外边缘与相邻的所述第二电极的外边缘之间的距离为2-5微米。
  4. 如权利要求3所述的显示面板，其中，所述显示面板还包括发光单元层，所述发光单元层包括层叠设置的第一发光单元层、第二发光单元层和第三发光单元层，所述第二发光单元层设置于所述第一发光单元层和所述第三发光单元层之间，所述像素定义层还包括对应于所述第二电极的像素开口，所述第一发光单元层设置于所述像素定义层上覆盖所述像素开口和所述透光孔且位于所述辅助层之下，所述第二发光单元层设置于所述像素开口内，所述第三发光单元层覆盖所述第二发光单元层和所述第一发光单元层且位于所述辅助层之下。
  5. 如权利要求4所述的显示面板，其中，所述第一电极层覆盖所述第三发光单元层和所述辅助部的至少部分区域。
  6. 如权利要求5所述的显示面板，其中，位于所述辅助层上的所述第一电极层的厚度小于位于所述发光单元层上的所述第一电极层的厚度。
  7. 如权利要求2所述的显示面板，其中，所述辅助部覆盖对应的所述透光孔的所述底部开口。
  8. 如权利要求7所述的显示面板，其中，所述辅助部包括平台部和位于所述平台部边缘的边缘部，所述边缘部的厚度沿远离所述平台部的方向逐渐减小，所述第一电极层至少覆盖部分所述边缘部。
  9. 如权利要求8所述的显示面板，其中，所述第一电极层的厚度在所述边缘部上沿所述边缘部厚度增大的方向逐渐减小。
  10. 如权利要求9所述的显示面板，其中，所述第一电极层覆盖部分所述边缘部。
  11. 如权利要求9所述的显示面板，其中，所述第一电极层覆盖整个所述边缘部。
  12. 如权利要求9所述的显示面板，其中，所述第一电极覆盖整个所述辅助层。
  13. 如权利要求7所述的显示面板，其中，所述辅助层还覆盖部分所述透光孔的侧壁。
  14. 如权利要求1所述的显示面板，其中，所述显示面板还包括透明填充层，所述透明填充层填充于所述透光孔内且位于所述第一电极层上。
  15. 如权利要求14所述的显示面板，其中，所述透明填充层的材料为透光率大于95%的透明有机材料。
  16. 如权利要求15所述的显示面板，其中，所述透明有机材料包括聚甲基丙烯酸甲酯。
  17. 一种显示装置，其包括显示面板，所述显示面板包括第一显示区和第二显示区，所述第一显示区的透光率大于所述第二显示区的透光率，在所述第一显示区内，所述显示面板包括像素区和位于所述像素区之间的透光区，所述显示面板包括：
    像素定义层，设有至少一个透光孔，所述透光孔位于对应的所述透光区内；
    辅助层，包括至少一个辅助部，所述辅助部位于对应的所述透光孔内；以及
    第一电极层，位于所述辅助层之上。
  18. 如权利要求17所述的显示装置，其中，所述透光孔包括顶部开口、底部开口和侧壁，所述顶部开口的尺寸大于所述底部开口的尺寸。
  19. 如权利要求18所述的显示装置，其中，所述显示面板还包括第二电极层，所述像素定义层设于所述第二电极层上，所述第二电极层包括多个第二电极，每一所述第二电极位于对应的所述像素区内，所述侧壁在所述底部开口处的外边缘与相邻的所述第二电极的外边缘之间的距离为2-5微米。
  20. 如权利要求17所述的显示装置，其中，所述显示面板还包括透明填充层，所述透明填充层填充于所述透光孔内且位于所述第一电极层上。
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