WO2020199536A1 - 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
WO2020199536A1
WO2020199536A1 PCT/CN2019/107918 CN2019107918W WO2020199536A1 WO 2020199536 A1 WO2020199536 A1 WO 2020199536A1 CN 2019107918 W CN2019107918 W CN 2019107918W WO 2020199536 A1 WO2020199536 A1 WO 2020199536A1
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Prior art keywords
cathode
display panel
metallic
display area
anode
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French (fr)
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吕磊
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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Publication of WO2020199536A1 publication Critical patent/WO2020199536A1/zh
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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
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80524—Transparent cathodes, e.g. comprising thin metal layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H10K50/818—Reflective anodes, e.g. ITO combined with thick metallic layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/828—Transparent cathodes, e.g. comprising thin metal layers
    • 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
    • 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
    • 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
    • H10K59/8051—Anodes
    • H10K59/80518—Reflective anodes, e.g. ITO combined with thick metallic layers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0408—Integration of the drivers onto the display substrate
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/302—Details of OLEDs of OLED structures
    • H10K2102/3023—Direction of light emission
    • H10K2102/3026—Top emission
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/302—Details of OLEDs of OLED structures
    • H10K2102/3023—Direction of light emission
    • H10K2102/3031—Two-side emission, e.g. transparent OLEDs [TOLED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/351—Thickness
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—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
    • H10K59/10—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
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors

Definitions

  • This application relates to the field of display technology, and in particular to a display panel and a display device.
  • OLED Organic Light-Emitting Diode, organic light-emitting diode
  • OLED cathodes should use metal materials with as low a work function as possible, because electron injection is more difficult than hole injection.
  • the size of the metal work function seriously affects the luminous efficiency and service life of the OLED device.
  • the lower the metal work function the easier the electron injection and the higher the luminous efficiency.
  • the lower the work function the lower the barrier of the organic/metal interface, the less Joule heat generated during operation, and the greater the lifetime of the device.
  • single-layer metal cathodes with low work function such as Mg, Ca, etc.
  • alloys of low work function metals and corrosion-resistant metals are generally selected as cathodes. Avoid this problem.
  • evaporating a single metal cathode film a large number of defects will be formed, resulting in poor oxidation resistance.
  • an alloy cathode is evaporated, a small amount of relatively active metal will preferentially diffuse into the defects, making the entire cathode layer stable.
  • the purpose of this application is to provide a full-screen display panel and display device thereof.
  • a first aspect of the present application provides a display panel having a transparent display area and a non-transparent display area.
  • the display panel includes at least a first cathode and a second cathode.
  • the transparent display area corresponds to the first cathode.
  • a cathode, the non-transparent display area corresponds to the second cathode; the work function of the first cathode is greater than the work function of the second cathode, and the work function ranges of the first cathode and the second cathode are respectively It is 3.8eV-4.1eV.
  • a second aspect of the present application provides a display device, including:
  • the device body has a device area
  • the display panel is covered on the device body;
  • the device area is located below the transparent display area of the display panel, and a photosensitive device that emits or collects light through the transparent display area is provided in the device area.
  • the work function of the first cathode corresponding to the transparent display area and the second cathode corresponding to the non-transparent display area are changed, so that the work function of the first cathode is greater than the work function of the second cathode, and the first cathode
  • the work function range of the second cathode is 3.8eV-4.1eV.
  • the work function of the first cathode is greater than that of the second cathode, so that the transparent display area and the non-transparent display area meet the requirements of their respective luminous efficiency; the work function ranges of the first cathode and the second cathode are 3.8eV-4.1eV, respectively, so that The light transmittance of the first cathode and the second cathode also meets the requirements of the respective regions; the luminous efficiency combined with the light transmittance, achieves that the transparent display area and the non-transparent display area meet the requirements of consistent brightness during display.
  • the first cathode and the second cathode include metallic magnesium and metallic silver.
  • the volume ratio of metallic magnesium in the first cathode ranges from 10% to 20%; and/or the volume ratio of metallic magnesium in the second cathode ranges from 8% to 20%.
  • the magnesium volume ratio in the above range not only meets the requirements for luminous efficiency, but also meets the requirements for light transmittance.
  • the volume ratio of metallic magnesium in the second cathode is 10%, which can better match the display effect of the first cathode in the above range.
  • the thickness of the first cathode is smaller than the thickness of the second cathode.
  • the brightness of the transparent display area and the non-transparent display area during display can be consistent with the thickness adjustment.
  • the first cathode includes metallic aluminum and metallic silver
  • the second cathode includes metallic magnesium and metallic silver.
  • the volume ratio of metallic aluminum in the first cathode ranges from 2% to 12%, and optionally, the volume ratio of metallic aluminum in the first cathode ranges from 2% to 6%; and/ Or the volume ratio of metallic magnesium in the second cathode ranges from 8% to 20%.
  • the volume ratio of metallic magnesium in the second cathode is 10%. Studies have shown that the volume ratio of aluminum and magnesium in the above range not only meets the demand for luminous efficiency, but also meets the demand for light transmittance.
  • the thickness of the first cathode is smaller than the thickness of the second cathode.
  • the volume ratio of aluminum in the first cathode is within the volume ratio of magnesium in the second cathode, and the thickness is adjusted to achieve the same brightness in the transparent display area and the non-transparent display area. .
  • the display panel includes a transparent display area, a non-transparent display area, and a transition area between the transparent display area and the non-transparent display area, and the transition area corresponds to a third cathode.
  • the material and thickness of the third cathode are the same as those of the second cathode.
  • the pixel density of the transparent display area may be less than the pixel density of the non-transparent display area; the pixel density of the transition area may be between the pixel density of the transparent display area and the pixel density of the non-transparent display area.
  • the transition area also belongs to a non-transparent display area, but by controlling the pixel density, a sudden change in resolution can be prevented and the display effect can be improved.
  • FIG. 1 is a top view of a display panel in an embodiment of the present application
  • FIG. 2 is a schematic diagram of a cross-sectional structure of a first OLED sub-pixel according to an embodiment of the present application
  • Figures 3 and 4 are respectively the wavelength-transmittance curve and the brightness-voltage curve diagram of the four embodiments of the blue first OLED sub-pixel, in the four embodiments of the blue first OLED sub-pixel ,
  • the volume of metallic magnesium in the first cathode is 10%, and the thickness of the first cathode is
  • the first The volume ratio of metallic magnesium in a cathode is 10%, 15%, and 20% respectively, and the thickness of the first cathode is all
  • FIG. 7 is a graph of light emission wavelength-transmittance curves of four embodiments of the red first OLED sub-pixel.
  • the volume ratio of the metal aluminum in the first cathode is respectively 4%, 6%, 8%, 10%
  • the thickness of the first cathode is all
  • FIG. 8 is a graph of the luminance-voltage curve of light emission of three embodiments of the red first OLED sub-pixel.
  • the volume ratio of the metal aluminum in the first cathode is 2%, 4%, 6%, the thickness of the first cathode is both
  • Figures 9 and 10 are wavelength-transmittance graphs and brightness-voltage graphs of the three embodiments of the blue first OLED sub-pixel.
  • the first The volume of metallic aluminum in the cathode is 6%, and the thickness of the first cathode is respectively
  • 11 is a comparison diagram of lifetimes when only the green first OLED sub-pixel emits light, and the first cathode respectively contains ITO, contains metallic magnesium and metallic silver, and contains metallic aluminum and metallic silver;
  • Figure 12 is a comparison diagram of the light transmittance of the first cathode containing ITO, containing metallic magnesium and metallic silver, and containing metallic aluminum and metallic silver when the wavelength is 460nm, where the abscissa 1 corresponds to the first cathode containing ITO and the abscissa 2 corresponds to The first cathode contains metallic magnesium and metallic silver, and the abscissa 3 corresponds to the first cathode containing metallic aluminum and metallic silver;
  • FIG. 13 is a comparison diagram of the brightness of the first cathode containing ITO, containing metallic magnesium and metallic silver, and containing metallic aluminum and metallic silver when the driving voltage between the transparent anode and the first cathode is 7V, where the abscissa 1 corresponds to the first A cathode contains ITO, the abscissa 2 corresponds to the first cathode containing metallic magnesium and metallic silver, and the abscissa 3 corresponds to the first cathode containing metallic aluminum and metallic silver;
  • FIG. 14 is a top view of the display panel in the second embodiment of the present application.
  • the ranges in this application include the endpoint values at both ends.
  • the display panel in the present application has a display surface (or light-emitting surface), and different display areas of the display panel are different areas formed by dividing the display surface. In a direction perpendicular to the display surface, the The display panel may include multiple elements in different display areas, such as a cathode, an OLED light-emitting material layer, and an anode.
  • a cathode an OLED light-emitting material layer
  • an anode anode
  • the display panel 1 includes at least a transparent display area 10a and a non-transparent display area 10b.
  • the cathode set 11 includes at least a first cathode 11a and a second cathode 11b.
  • the transparent display area 10a corresponds to the first cathode 11a, and the non-transparent display area 10b Corresponding to the second cathode 11b; the work function of the first cathode 11a is greater than the work function of the second cathode 11b, and the work function ranges of the first cathode 11a and the second cathode 11b are 3.8 eV-4.1 eV, respectively.
  • the work function of the first cathode 11a is greater than the work function of the second cathode 11b, so that the transparent display area 10a and the non-transparent display area 10b meet the requirements of their respective luminous efficiency;
  • the work function ranges of the first cathode 11a and the second cathode 11b are respectively 3.8 eV-4.1eV, so that the light transmittance of the first cathode 11a and the second cathode 11b also meet the requirements of their respective regions.
  • the combination of luminous efficiency and light transmittance makes the transparent display area 10a and the non-transparent display area 10b meet the requirement of consistent brightness during display.
  • the first cathode 11a and the second cathode 11b may include metallic magnesium and metallic silver.
  • the volume ratio of metallic magnesium in the first cathode 11a ranges from 10% to 20%; and/or the volume ratio of metallic magnesium in the second cathode 11b ranges from 8% to 20%.
  • the magnesium volume ratio in the above range not only meets the requirements for luminous efficiency, but also meets the requirements for light transmittance.
  • the volume ratio of metallic magnesium in the second cathode 11b is 10%.
  • 10-20% of the above-mentioned volume ratio of metallic magnesium is the volume ratio of metallic magnesium in the first cathode 11a containing only metallic magnesium and metallic silver.
  • the volume ratio of metallic silver in the first cathode 11a is 80%-90%.
  • the first cathode 11a of the above-mentioned preferred embodiment may contain other elements in addition to metallic magnesium and metallic silver, and only the volume proportion of metallic magnesium is limited.
  • the volume ratio of metallic magnesium in the second cathode 11b ranges from 8% to 20%.
  • the second cathode 11b only contains metallic magnesium and metallic silver, and the volume ratio of metallic silver is 80% to 92%. %.
  • the second cathode 11b of the above-mentioned preferred solution may contain other elements in addition to metallic aluminum and metallic silver, and only the volume proportion of metallic magnesium is limited.
  • the thickness adjustment of the first cathode 11a and the second cathode 11b can further realize the display of the transparent display area 10a and the non-transparent display area 10b.
  • the brightness is consistent.
  • the thickness of the first cathode 11a may be smaller than the thickness of the second cathode 11b.
  • the thickness range of the first cathode 11a is optionally, the thickness range of the first cathode 11a is And/or the thickness range of the second cathode 11b is Optionally, the thickness range of the second cathode 11b is
  • the transparent display area 10a and the non-transparent display area 10b may include arrayed light-emitting units.
  • Each light-emitting unit of the transparent display area 10a includes a plurality of first OLED sub-pixels
  • each light-emitting unit of the non-transparent display area 10b includes a plurality of second OLED sub-pixels. Pixels.
  • Each of the first and second OLED sub-pixels is used to emit light of a primary color, such as red, green, blue or red, green, blue, and yellow, which is not limited in this application.
  • each first OLED sub-pixel 111 includes, from bottom to top, at least: a light-transmitting anode 111b formed on a light-transmitting substrate 111a, a pixel definition layer 111c having an opening, and an OLED emitting light in the opening.
  • Fig. 3 and Fig. 4 are the light-emitting wavelength-transmittance curves and brightness of the four embodiments of the blue first OLED sub-pixel.
  • Fig. 3 and Fig. 4 are the light-emitting wavelength-transmittance curves and brightness of the four embodiments of the blue first OLED sub-pixel.
  • -Voltage curve diagram In the four embodiments of the blue first OLED sub-pixel, the volume of magnesium metal in the first cathode 11a accounts for an average of 10%, and the thickness of the first cathode 11a is respectively
  • the luminous brightness of the transparent display area 10a basically meets the requirements; especially the thickness is When the luminous brightness is greater than 1000cd/m 2 .
  • the first The volume ratio of metallic magnesium in a cathode 11a is 10%, 15%, and 20% respectively, and the thickness of the first cathode 11a is all
  • the light transmittance of the transparent display area 10a is basically 60%, especially in the 530nm-780nm band, the volume of metal magnesium is 10% and 15% respectively. When the light transmittance is greater than 60%.
  • the luminous brightness of the transparent display area 10a basically meets the requirements; in particular, the volume ratio of metal magnesium is 10% and 15% respectively. %, the luminous brightness is greater than 6000cd/m 2 .
  • Table 1 is a list of experimental results of Examples and Comparative Examples. As shown in Table 1:
  • the blue OLED sub-pixel has the lowest light-emitting brightness. If the light-emitting brightness of the blue OLED sub-pixel meets the demand, the light-emitting brightness of the red and green OLED sub-pixels Also meet demand.
  • the first cathode 11a includes metallic aluminum and metallic silver
  • the second cathode 11b includes metallic magnesium and metallic silver. The higher the volume ratio of magnesium and aluminum, the easier the electron injection and the higher the luminous efficiency, but the worse the light transmittance.
  • the volume ratio of metallic aluminum in the first cathode 11a ranges from 2% to 12%, and optionally, the volume ratio of metallic aluminum in the first cathode 11a ranges from 2% to 6%; and/or
  • the volume ratio of metallic magnesium in the second cathode 11b is 8%-20%, and optionally, the volume ratio of metallic magnesium in the second cathode 11b is 10%.
  • the volume ratio of the foregoing metal aluminum ranges from 2% to 12%, which is the volume ratio of the metal aluminum in the first cathode 11a containing only metal aluminum and metal silver. In other words, the volume ratio of metallic silver in the first cathode 11a is 82%-92%.
  • the first cathode 11a of the above-mentioned preferred solution may contain other elements in addition to metallic aluminum and metallic silver, and only the volume proportion of metallic aluminum is limited.
  • the volume ratio of metallic magnesium in the second cathode 11b ranges from 8% to 20%.
  • the second cathode 11b only contains metallic magnesium and metallic silver, and the volume ratio of metallic silver is 80% to 92%. %.
  • the second cathode 11b of the above-mentioned preferred solution may contain other elements besides metallic magnesium and metallic silver, and only the volume proportion of metallic magnesium is limited.
  • the transparent display area 10a and the second cathode 11b can be adjusted by adjusting the thickness of the first cathode 11a and the second cathode 11b.
  • the non-transparent display area 10b has the same brightness during display.
  • the thickness of the first cathode 11a may be smaller than the thickness of the second cathode 11b.
  • the thickness range of the first cathode 11a is optionally, the thickness range of the first cathode 11a is And/or the thickness range of the second cathode 11b is Optionally, the thickness range of the second cathode 11b is
  • FIG. 7 is a graph of the emission wavelength-transmittance curve of four embodiments of the red first OLED sub-pixel.
  • the volume ratio of metallic aluminum in the first cathode 11a is 4%, 6%, 8%, and 10%, respectively, and the thickness of the first cathode 11a is all
  • FIG. 8 is a graph of the luminance-voltage curve of the light emission of three embodiments of the red first OLED sub-pixel.
  • the volume ratio of metal aluminum in the first cathode 11a is 2% respectively , 4%, 6%
  • the thickness of the first cathode 11a is
  • the light transmittance of the transparent display area 10a basically meets the requirements, especially in the 530nm-780nm band, when the volume ratio of metal aluminum is 4% and 6% respectively ,
  • the light transmittance is basically greater than 60%.
  • the light-emitting brightness of the transparent display area 10a is greater than 1000 cd/m 2 .
  • Figures 9 and 10 are wavelength-transmittance graphs and brightness-voltage graphs of the three embodiments of the blue first OLED sub-pixel.
  • the first The volume ratio of metal aluminum in the cathode 11a is 6%, and the thickness of the first cathode 11a is respectively
  • the light transmittance of the transparent display area 10a is basically 60% in the 430nm-780nm band.
  • the luminous brightness of the transparent display area 10a is greater than 1000 cd/m 2 .
  • FIG. 11 shows that when only the green first OLED sub-pixel emits light, the first cathode 11a respectively contains ITO, contains metallic magnesium and metallic silver (that is, scheme 1 in FIG. 11), and contains metallic aluminum and metallic silver (that is, the scheme in FIG. 11). 2) Life comparison chart at time.
  • the lifetime of the first cathode 11a containing metallic magnesium and metallic silver i.e. scheme 1 in FIG. 11
  • the first cathode 11a containing metallic aluminum and metallic silver i.e. scheme 2 in FIG. 11
  • the lifetime of the ITO is longer than that of the first cathode 11a containing ITO.
  • Figure 12 shows the light transmittance of the first cathode 11a containing ITO, metal magnesium and metal silver (scheme 1 in Figure 11), metal aluminum and metal silver (scheme 2 in Figure 11) when the wavelength is 460nm.
  • the abscissa 1 corresponds to the first cathode 11a containing ITO
  • the abscissa 2 corresponds to the first cathode 11a containing metallic magnesium and metallic silver
  • the abscissa 3 corresponds to the first cathode 11a containing metallic aluminum and metallic silver.
  • the light transmittance of the first cathode 11a containing metallic magnesium and metallic silver and the light transmittance of the first cathode 11a containing metallic aluminum and metallic silver are lower than that of the first cathode 11a containing ITO.
  • the light transmittance is between 60% and 70%, which basically meets the light transmittance requirement of the transparent display area 10a.
  • the light transmittance of other wavelengths with a wavelength greater than 460nm is greater than the light transmittance at the wavelength of 460nm.
  • the first cathode 11a contains ITO, contains metallic magnesium and metallic silver, and contains metallic aluminum and metallic silver.
  • the abscissa 1 corresponds to the first cathode 11a containing ITO
  • the abscissa 2 corresponds to the first cathode 11a containing metallic magnesium and metallic silver
  • the abscissa 3 corresponds to the first cathode 11a containing metallic aluminum and metallic silver.
  • the brightness of the first cathode 11a containing metallic magnesium and metallic silver and the brightness when containing metallic aluminum and metallic silver are higher than the brightness of containing ITO.
  • Table 2 is a list of the results of the alternatives and comparative experiments. As shown in Table 2:
  • the blue OLED sub-pixel has the lowest light-emitting brightness. If the light-emitting brightness of the blue OLED sub-pixel meets the demand, the light-emitting brightness of the red and green OLED sub-pixels Meet the demand.
  • the above two alternatives can also be combined, that is, the first cathode 11a includes metallic aluminum, metallic magnesium, and metallic silver, and the second cathode 11b includes metallic magnesium and metallic silver.
  • the volume proportions of metallic magnesium and metallic aluminum in the first cathode 11a can be proportionally distributed in the aforementioned optional solutions; for example, each is half, and the volume proportion of metallic magnesium ranges from 5% to 10%.
  • the volume ratio of metallic aluminum ranges from 1% to 6%.
  • the volume ratio of metallic aluminum ranges from 1% to 3%.
  • the thickness of the first cathode 11a can range from or
  • FIG. 14 is a top view of the display panel in the second embodiment of the present application.
  • the display panel 1 includes a transparent display area 10a, a non-transparent display area 10b, and a transition area 10c between the transparent display area 10a and the non-transparent display area 10b.
  • the cathode group 11 further includes a second transition area 10c.
  • the material and thickness of the three cathodes 11c and the third cathode 11c are the same as those of the second cathode 11b.
  • the pixel density of the transparent display area 10a may be less than the pixel density of the non-transparent display area 10b; the pixel density of the transition area 10c may be between the pixel density of the transparent display area 10a and the pixel density of the non-transparent display area 10b.
  • the transition area 10c also belongs to a non-transparent display area 10b.
  • the transparent display area 10a corresponds to the first anode
  • the non-transparent display area 10b corresponds to the second anode
  • the first anode is a transparent anode
  • the work function range of the transparent anode is 4.4eV-5eV
  • the second anode is reflective
  • the anode and the reflective anode include a light-transmitting layer and a reflective layer, the work function of the light-transmitting layer ranges from 4.4 eV to 5 eV; and/or the reflectivity of the reflective anode ranges from 90% to 100%.
  • the first anode combined with the first cathode and the second anode combined with the second cathode can achieve an average light transmittance of 60%-70% in the transparent display area 10a and an average transmittance of the non-transparent display area 10b in the 380nm-780nm band.
  • the light rate is 40%-45%, and the luminous brightness of the transparent display area 10a and the non-transparent display area 10b can be more consistent.
  • the transition area 10c corresponds to the third anode
  • the third anode is made of the same material as the second anode.
  • the display panel further includes a first OLED light-emitting material layer and a second OLED light-emitting material layer, the transparent display area corresponds to the first OLED light-emitting material layer, and the non-transparent display area corresponds to the The second OLED light-emitting material layer; the first OLED light-emitting material layer is arranged between the first cathode and the first anode; the second OLED light-emitting material layer is arranged between the second cathode and the first anode Between two anodes.
  • the display panel further includes a third OLED light-emitting material layer, and the transition area corresponds to the third OLED light-emitting material layer; the third OLED light-emitting material layer is arranged on the third cathode and the Between the third anode.
  • the present application also provides a display device.
  • the display device can be a display device such as a mobile phone, a tablet computer, a car display, etc.
  • the display device includes:
  • the device body has a device area
  • the device area is located under the transparent display area 10a of the display panel, and a photosensitive device that emits or collects light through the transparent display area 10a is arranged in the device area.
  • the photosensitive device may include a camera and/or a light sensor.
  • the light sensor may include one or a combination of an iris recognition sensor and a fingerprint recognition sensor.

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Abstract

本申请提供了一种显示面板及显示装置，通过改变透明显示区所对应第一阴极、以及非透明显示区所对应第二阴极的功函数，使得第一阴极的功函数大于第二阴极的功函数，且第一阴极与第二阴极的功函数范围分别为3.8eV-4.1eV。第一阴极的功函数大于第二阴极的功函数，使得透明显示区与非透明显示区满足各自发光效率的需求；第一阴极与第二阴极的功函数范围分别为3.8eV-4.1eV，使得第一阴极与第二阴极的透光率也满足各自区域需求；发光效率结合透光率，达到透明显示区与非透明显示区满足显示时亮度一致的需求。

Description

显示面板及显示装置
相关申请的交叉引用
本申请要求于2019年3月29日提交中国专利局，申请号为201910252019.8，申请名称为“显示装置及其显示面板”的中国专利申请的优先权。
技术领域
本申请涉及显示技术领域，尤其涉及一种显示面板及显示装置。
背景技术
随着显示装置的快速发展，用户对显示屏幕占比的要求越来越高。由于移动终端的显示屏幕上方通常需要安装摄像头、传感器、听筒等元件，因此相关技术中采用异形屏(notch)设计方案，显示屏幕上部通常会切掉一部分区域用于安装上述元件，影响了显示屏幕的整体一致性，从而使全面屏显示受到业界越来越多的关注。
OLED(Organic Light-Emitting Diode，有机发光二极管)器件主要包括层叠设置的阳极、有机发光层和阴极。为提高电子的注入效率，OLED阴极应该选用功函数尽可能低的金属材料，因为电子的注入比空穴的注入难度大。金属功函数的大小严重地影响着OLED器件的发光效率和使用寿命，金属功函数越低，电子注入就越容易，发光效率就越高。此外，功函数越低，有机/金属界面势垒越低，工作中产生的焦耳热就会越少，器件寿命就会有较大的提高。
然而，低功函数的单层金属阴极，如Mg、Ca等，在空气中很容易被氧化，致使器件不稳定、使用寿命缩短，因此一般选择低功函数金属和抗腐蚀金属的合金做阴极来避免这一问题。在蒸发单一金属阴极薄膜时，会形成大量的缺陷，造成耐氧化性变差；而蒸镀合金阴极时，少量化学性质相对活泼的金属会优先扩散到缺陷中，使整个阴极层变得稳定。
因此，开发具有优异性能的阴极结构是促进OLED产业技术发展的关键技术之一。
发明内容
本申请的目的是提供一种用于全面屏的显示面板及其显示装置。
为实现上述目的，本申请的第一方面提供一种显示面板，具有透明显示区与非透明显示区，所述显示面板至少包括第一阴极与第二阴极，所述透明显示区对应所述第一阴极，所述非透明显示区对应所述第二阴极；所述第一阴极的功函数大于所述第二阴极的功函数， 所述第一阴极与所述第二阴极的功函数范围分别为3.8eV-4.1eV。
本申请的第二方面提供一种显示装置，包括：
设备本体，具有器件区；
以及上述的显示面板，所述显示面板覆盖在所述设备本体上；
其中，所述器件区位于所述显示面板的所述透明显示区下方，且所述器件区中设置有透过所述透明显示区发射或者采集光线的感光器件。
1)本申请实施例通过改变透明显示区所对应第一阴极、以及非透明显示区所对应第二阴极的功函数，使得第一阴极的功函数大于第二阴极的功函数，且第一阴极与第二阴极的功函数范围分别为3.8eV-4.1eV。第一阴极的功函数大于第二阴极的功函数，使得透明显示区与非透明显示区满足各自发光效率的需求；第一阴极与第二阴极的功函数范围分别为3.8eV-4.1eV，使得第一阴极与第二阴极的透光率也满足各自区域需求；发光效率结合透光率，达到透明显示区与非透明显示区满足显示时亮度一致的需求。
2)可选的，所述第一阴极与所述第二阴极包含金属镁和金属银。金属镁体积占比越高，电子注入越容易、发光效率越高，但透光率越差。
可选的，所述第一阴极中金属镁的体积占比范围为10％-20％；和/或所述第二阴极中金属镁的体积占比范围为8％-20％。研究表明，上述范围的镁体积占比既满足发光效率需求，又满足透光率需求。在一实施例中，所述第二阴极中金属镁的体积占比为10％，更能与上述范围的第一阴极显示效果匹配。
3)可选方案中，所述第一阴极的厚度小于所述第二阴极的厚度。第一阴极与第二阴极厚度越厚，透光率越差，但电阻越小、可注入的电子越多。在2)可选方案中的第一阴极与第二阴极中金属镁体积占比范围内，进一步通过厚度调节达到透明显示区与非透明显示区显示时的亮度一致。
4)可选的，所述第一阴极包含金属铝和金属银，所述第二阴极包含金属镁和金属银。金属镁、铝体积占比越高，电子注入越容易、发光效率越高，但透光率越差。
可选的，所述第一阴极中金属铝的体积占比范围为2％-12％，可选的，所述第一阴极中金属铝的体积占比范围为2％-6％；和/或所述第二阴极中金属镁的体积占比范围为8％-20％，可选的，所述第二阴极中金属镁的体积占比为10％。研究表明，上述范围的铝、镁体积占比既满足发光效率需求，又满足透光率需求。
5)可选的，所述第一阴极的厚度小于所述第二阴极的厚度。第一阴极与第二阴极厚度越厚，透光率越差，但电阻越小、可注入的电子越多。在4)可选方案中的第一阴极中 金属铝体积占比范围，与第二阴极中金属镁体积占比范围内，进一步通过厚度调节达到透明显示区与非透明显示区显示时的亮度一致。
6)可选的，所述显示面板包括透明显示区、非透明显示区以及位于所述透明显示区与所述非透明显示区之间的过渡区，所述过渡区对应第三阴极，所述第三阴极的材质及厚度与所述第二阴极的材质及厚度分别相同。透明显示区的像素密度可以小于非透明显示区的像素密度；过渡区的像素密度可以介于透明显示区的像素密度与非透明显示区的像素密度之间。换言之，过渡区也属于一种非透明显示区，但是通过控制像素密度可以防止分辨率突变，提升显示效果。
附图说明
图1是本申请一实施例中的显示面板的俯视图；
图2是本申请一实施例的第一OLED子像素的截面结构示意图；
图3、图4分别是蓝色第一OLED子像素的四个实施例的发光的波长-透光率曲线图和亮度-电压曲线图，在蓝色第一OLED子像素的四个实施例中，第一阴极中金属镁的体积占比均为10％，第一阴极的厚度分别为
Figure PCTCN2019107918-appb-000001
图5、图6分别是红色第一OLED子像素的三个实施例的发光的波长-透光率曲线图、亮度-电压曲线图，在红色第一OLED子像素的三个实施例中，第一阴极中金属镁的体积占比分别为10％、15％、20％，第一阴极的厚度均为
Figure PCTCN2019107918-appb-000002
图7是红色第一OLED子像素的四个实施例的发光的波长-透光率曲线图，在红色第一OLED子像素的四个实施例中，第一阴极中金属铝的体积占比分别为4％、6％、8％、10％，第一阴极的厚度均为
Figure PCTCN2019107918-appb-000003
图8是红色第一OLED子像素三个实施例的发光的亮度-电压曲线图，在红色第一OLED子像素三个实施例中，第一阴极中金属铝的体积占比分别为2％、4％、6％，第一阴极的厚度均为
Figure PCTCN2019107918-appb-000004
图9、图10是蓝色第一OLED子像素三个实施例的发光的波长-透光率曲线图、亮度-电压曲线图，在蓝色第一OLED子像素三个实施例中，第一阴极中金属铝的体积占比均为6％，第一阴极的厚度分别为
Figure PCTCN2019107918-appb-000005
图11是仅绿色第一OLED子像素发光时，第一阴极分别包含ITO、包含金属镁和金属银、包含金属铝和金属银时的寿命比较图；
图12是波长为460nm时，第一阴极分别包含ITO、包含金属镁和金属银、包含金属铝和金属银的透光率比较图，其中横坐标1对应第一阴极包含ITO、横坐标2对应第一阴极包含 金属镁和金属银、横坐标3对应第一阴极包含金属铝和金属银；
图13是透光阳极与第一阴极之间的驱动电压为7V时，第一阴极分别包含ITO、包含金属镁和金属银、包含金属铝和金属银的亮度比较图，其中横坐标1对应第一阴极包含ITO、横坐标2对应第一阴极包含金属镁和金属银、横坐标3对应第一阴极包含金属铝和金属银；
图14是本申请第二实施例中的显示面板的俯视图。
具体实施方式
为了便于理解本申请，下面将参照相关附图对本申请的示例性实施例进行更全面的描述。本申请可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本申请的公开内容的理解更加透彻全面。
本申请中的范围都包含两端的端点值。本申请中的显示面板具有显示表面(或称出光表面)，所述显示面板的不同显示区是对所述显示表面划分所形成的不同区域，在垂直于所述显示表面的方向上，所述显示面板在不同显示区可以包括多个元件，例如阴极、OLED发光材料层和阳极。在本申请提到各阴极的材料组成时，不限定各阴极仅由提到的材料组成，还可以含有其他材料，但其他材料的含量均较少，不影响各阴极达到要求的性能，例如其他材料以杂质形式存在。
参照图1，显示面板1至少包括透明显示区10a与非透明显示区10b，阴极组11至少包括第一阴极11a与第二阴极11b，透明显示区10a对应第一阴极11a，非透明显示区10b对应第二阴极11b；第一阴极11a的功函数大于第二阴极11b的功函数，第一阴极11a与第二阴极11b的功函数范围分别为3.8eV-4.1eV。
第一阴极11a的功函数大于第二阴极11b的功函数，使得透明显示区10a与非透明显示区10b满足各自发光效率的需求；第一阴极11a与第二阴极11b的功函数范围分别为3.8eV-4.1eV，使得第一阴极11a与第二阴极11b的透光率也满足各自区域需求。发光效率结合透光率，使得透明显示区10a与非透明显示区10b满足显示时亮度一致的需求。
一个可选实施例中，第一阴极11a与第二阴极11b可以包含金属镁和金属银。金属镁体积占比越高，电子注入越容易、发光效率越高，但透光率越差。
可选的，第一阴极11a中金属镁的体积占比范围为10％-20％；和/或第二阴极11b中金属镁的体积占比范围为8％-20％。研究表明，上述范围的镁体积占比既满足发光效率需求，又满足透光率需求。可选的，第二阴极11b中金属镁的体积占比为10％。
本可选实施例中，上述金属镁的体积占比10％-20％为仅包含金属镁与金属银的第一阴极11a中金属镁的体积占比。换言之，第一阴极11a中金属银的体积占比为80％-90％。其 它可选方案中，上述优选方案的第一阴极11a中除了包含金属镁与金属银外，还可以包含其它元素，仅限定金属镁的体积占比。第二阴极11b中金属镁的体积占比范围为8％-20％类似，本可选方案中，第二阴极11b中仅包含金属镁与金属银，金属银的体积占比为80％-92％。其它可选方案中，上述优选方案的第二阴极11b中除了包含金属铝与金属银外，还可以包含其它元素，仅限定金属镁的体积占比。
第一阴极11a与第二阴极11b厚度越厚，透光率越差，但电阻越小、可注入的电子越多。在上述第一阴极11a与第二阴极11b中金属镁体积占比范围内，还可以进一步通过第一阴极11a与第二阴极11b的厚度调节实现透明显示区10a与非透明显示区10b显示时的亮度一致。
具体地，第一阴极11a的厚度可以小于第二阴极11b的厚度。
可选的，第一阴极11a的厚度范围为
Figure PCTCN2019107918-appb-000006
可选的，第一阴极11a的厚度范围为
Figure PCTCN2019107918-appb-000007
和/或第二阴极11b的厚度范围为
Figure PCTCN2019107918-appb-000008
可选的，第二阴极11b的厚度范围为
Figure PCTCN2019107918-appb-000009
透明显示区10a与非透明显示区10b可以包括阵列式发光单元，透明显示区10a的每一发光单元包括若干第一OLED子像素，非透明显示区10b的每一发光单元包括若干第二OLED子像素。每一第一、第二OLED子像素用于发一基色光，例如红、绿、蓝或红、绿、蓝、黄，本申请对此并不加以限制。
图2是本申请一实施例的第一OLED子像素的截面结构示意图。参照图2所示，每一第一OLED子像素111自下而上至少依次包括：形成于透光衬底111a上的透光阳极111b、具有开口的像素定义层111c、位于开口内的OLED发光材料层111d、以及位于OLED发光材料层111d上的第一阴极11a；每一第一OLED子像素111的透光阳极111b与第一阴极11a之间施加驱动电压时，透明显示区10a执行显示功能；每一第一OLED子像素111的透光阳极111b与第一阴极11a之间未施加驱动电压时，透明显示区10a执行透光功能。
为了验证上述可选方案的有益效果，发明人进行了若干实验，其中，图3、图4分别是蓝色第一OLED子像素的四个实施例的发光的波长-透光率曲线图和亮度-电压曲线图，在蓝色第一OLED子像素的四个实施例中，第一阴极11a中金属镁的体积占均比10％，第一阴极11a的厚度分别为
Figure PCTCN2019107918-appb-000010
参照图3所示，可以看出，在430nm-780nm波段，当第一阴极11a的厚度为
Figure PCTCN2019107918-appb-000011
Figure PCTCN2019107918-appb-000012
和
Figure PCTCN2019107918-appb-000013
时，透明显示区10a的透光率均大于60％，当第一阴极11a的厚度为
Figure PCTCN2019107918-appb-000014
时，透明显示区10a的透光率基本大于60％。
参照图4所示，对于透光阳极111b与第一阴极11a之间的驱动电压为7V时，透明显示区10a的发光亮度基本满足需求；尤其是厚度为
Figure PCTCN2019107918-appb-000015
时，发光亮度大于1000cd/m 2。
图5、图6分别是红色第一OLED子像素的三个实施例的发光的波长-透光率曲线图、亮度-电压曲线图，在红色第一OLED子像素的三个实施例中，第一阴极11a中金属镁的体积占比分别为10％、15％、20％，第一阴极11a的厚度均为
Figure PCTCN2019107918-appb-000016
参照图5所示，可以看出，在430nm-780nm波段，透明显示区10a的透光率基本为60％，尤其是在530nm-780nm波段，金属镁的体积占比分别为10％、15％时，透光率大于60％。
参照图6所示，对于透光阳极111b与第一阴极11a之间的驱动电压为7V时，透明显示区10a的发光亮度基本满足需求；尤其是金属镁的体积占比分别为10％、15％时，发光亮度大于6000cd/m 2。
为了验证上述可选方案的有益效果，发明人进行了若干对比实验。表1为实施例与对比例的实验结果列表。如下表1：
表1实施例与对比例的实验结果
Figure PCTCN2019107918-appb-000017
需要说明的是，在红、绿、蓝三基色OLED子像素中，蓝色OLED子像素的发光亮度最低，若蓝色OLED子像素的发光亮度满足需求，则红色、绿色OLED子像素的发光亮度也满足需求。
另一个可选方案中，第一阴极11a包含金属铝和金属银，第二阴极11b包含金属镁和金属银。金属镁、铝体积占比越高，电子注入越容易、发光效率越高，但透光率越差。
可选的，第一阴极11a中金属铝的体积占比范围为2％-12％，可选的，第一阴极11a中金属铝的体积占比范围为2％-6％；和/或第二阴极11b中金属镁的体积占比为8％-20％，可选的，第二阴极11b中金属镁的体积占比为10％。研究表明，上述范围的铝、镁体积占比既满足发光效率需求，又满足透光率需求。
本可选方案中，上述金属铝的体积占比范围为2％-12％为仅包含金属铝与金属银的第一阴极11a中金属铝的体积占比。换言之，第一阴极11a中金属银的体积占比为82％-92％。其它可选方案中，上述优选方案的第一阴极11a中除了包含金属铝与金属银外，还可以包含其它元素，仅限定金属铝的体积占比。第二阴极11b中金属镁的体积占比范围为8％-20％类似，本可选方案中，第二阴极11b中仅包含金属镁与金属银，金属银的体积占比为80％-92％。其它可选方案中，上述优选方案的第二阴极11b中除了包含金属镁与金属银外，还可以包含其它元素，仅限定金属镁的体积占比。
第一阴极11a与第二阴极11b厚度越厚，透光率越差，但电阻越小、可注入的电子越多。在上述第一阴极11a中金属铝体积占比范围，与第二阴极11b中金属镁体积占比范围内，还可以进一步通过第一阴极11a与第二阴极11b的厚度调节实现透明显示区10a与非透明显示区10b显示时的亮度一致。
具体地，第一阴极11a的厚度可以小于第二阴极11b的厚度。
可选的，第一阴极11a的厚度范围为
Figure PCTCN2019107918-appb-000018
可选的，第一阴极11a的厚度范围为
Figure PCTCN2019107918-appb-000019
和/或第二阴极11b的厚度范围为
Figure PCTCN2019107918-appb-000020
可选的，第二阴极11b的厚度范围为
Figure PCTCN2019107918-appb-000021
为了验证上述可选方案的有益效果，发明人进行了若干实验，其中，图7是红色第一OLED子像素的四个实施例的发光的波长-透光率曲线图，在红色第一OLED子像素的四个实施例中，第一阴极11a中金属铝的体积占比分别为4％、6％、8％、10％，第一阴极11a的厚度均为
Figure PCTCN2019107918-appb-000022
图8是红色第一OLED子像素三个实施例的发光的亮度-电压曲线图，在红色第一OLED子像素三个实施例中，第一阴极11a中金属铝的体积占比分别为2％、4％、6％，第一阴极11a的厚度均为
Figure PCTCN2019107918-appb-000023
参照图7所示，可以看出，在380nm-780nm波段，透明显示区10a的透光率基本满足需求，尤其是在530nm-780nm波段，金属铝的体积占比分别为4％、6％时，透光率基本大于60％。
参照图8所示，对于透光阳极111b与第一阴极11a之间的驱动电压为7V时，透明显示区10a的发光亮度大于1000cd/m 2。
图9、图10是蓝色第一OLED子像素三个实施例的发光的波长-透光率曲线图、亮度-电压曲线图，在蓝色第一OLED子像素三个实施例中，第一阴极11a中金属铝的体积占比均为6％，第一阴极11a厚度分别为
Figure PCTCN2019107918-appb-000024
参照图9所示，可以看出，在430nm-780nm波段，透明显示区10a的透光率基本为60％。
参照图10所示，对于透光阳极111b与第一阴极11a之间的驱动电压为7V时，透明显示区10a的发光亮度大于1000cd/m 2。
图11是仅绿色第一OLED子像素发光时，第一阴极11a分别包含ITO、包含金属镁和金属银(即图11中的方案1)、包含金属铝和金属银(即图11中的方案2)时的寿命比较图。
参照图11所示，包含金属镁和金属银的第一阴极11a(即图11中的方案1)的寿命和包含金属铝和金属银(即图11中的方案2)时的第一阴极11a的寿命长于包含ITO的第一阴极11a的寿命。
图12是波长为460nm时，第一阴极11a分别包含ITO、包含金属镁和金属银(即图11中的方案1)、包含金属铝和金属银(即图11中的方案2)的透光率比较图，其中横坐标1对应第一阴极11a包含ITO、横坐标2对应第一阴极11a包含金属镁和金属银、横坐标3对应第一阴极11a包含金属铝和金属银。
可以看出，波长为460nm时，包含金属镁和金属银的第一阴极11a的透光率和包含金属铝和金属银的第一阴极11a的透光率虽然小于包含ITO的第一阴极11a的透光率，但介于60％-70％，基本满足透明显示区10a的透光率需求。
需要说明的是，在380nm-780nm波段，波长大于460nm的其它波长的透光率均大于波长为460nm时的透光率。
图13是透光阳极111b与第一阴极11a之间的驱动电压为7V时，第一阴极11a分别包含ITO、包含金属镁和金属银、包含金属铝和金属银的亮度比较图，其中横坐标1对应第一阴极11a包含ITO、横坐标2对应第一阴极11a包含金属镁和金属银、横坐标3对应第一阴极11a包含金属铝和金属银。
可以看出，第一阴极11a包含金属镁和金属银的亮度和包含金属铝和金属银时的亮度均高于包含ITO的亮度。
为了验证上述可选方案的有益效果，发明人进行了若干对比实验。表2为本可选方案与对比实验的结果列表。如下表2：
表2实施例与对比例的实验结果
Figure PCTCN2019107918-appb-000025
需要说明的是，在红、绿、蓝三基色OLED子像素中，蓝色OLED子像素的发光亮度最低，若蓝色OLED子像素的发光亮度满足需求，则红色、绿色OLED子像素的发光亮度满足需求。
再一个可选方案中，还可以结合上述两个可选方案，即：第一阴极11a包含金属铝、金属镁和金属银，第二阴极11b包含金属镁和金属银。
本可选方案中，第一阴极11a中，金属镁、金属铝的体积占比可以在前述可选方案中按比例分配；例如各占一半，金属镁的体积占比范围为5％-10％，金属铝的体积占比范围为1％-6％，可选的，金属铝的体积占比范围为1％-3％。第一阴极11a的厚度范围可以介于
Figure PCTCN2019107918-appb-000026
或者
Figure PCTCN2019107918-appb-000027
图14是本申请第二实施例中的显示面板的俯视图。
参照图14所示，显示面板1包括透明显示区10a、非透明显示区10b以及位于透明显示区10a与非透明显示区10b之间的过渡区10c，阴极组11进一步包括对应过渡区10c的第三阴极11c，第三阴极11c的材质及厚度与所述第二阴极11b的材质及厚度分别相同。
透明显示区10a的像素密度可以小于非透明显示区10b的像素密度；过渡区10c的像素密度可以介于透明显示区10a的像素密度与非透明显示区10b的像素密度之间。过渡区10c也属于一种非透明显示区10b，通过控制像素密度可以防止透明显示区10a与非透明显示区10b之间的分辨率突变，提升显示效果。
显示面板1中，透明显示区10a对应第一阳极，非透明显示区10b对应第二阳极；第 一阳极为透光阳极，透光阳极的功函数范围为4.4eV-5eV，第二阳极为反射阳极，反射阳极包括透光层与反射层，透光层的功函数范围为4.4eV-5eV；和/或反射阳极的反射率范围为90％-100％。
上述第一阳极结合第一阴极、第二阳极结合第二阴极，可以实现在380nm～780nm波段内，透明显示区10a的平均透光率为60％-70％，非透明显示区10b的平均透光率为40％-45％，更能实现透明显示区10a与非透明显示区10b的发光亮度一致。
一个可选方案中，对于具有过渡区10c的显示面板，过渡区10c对应第三阳极，第三阳极与第二阳极的材质相同。
在一个实施例中，所述显示面板还包括第一OLED发光材料层和第二OLED发光材料层，所述透明显示区对应所述第一OLED发光材料层，所述非透明显示区对应所述第二OLED发光材料层；所述第一OLED发光材料层设置在所述第一阴极与所述第一阳极之间；所述第二OLED发光材料层设置在所述第二阴极与所述第二阳极之间。
在一个实施例中，所述显示面板还包括第三OLED发光材料层，所述过渡区对应所述第三OLED发光材料层；所述第三OLED发光材料层设置在所述第三阴极与所述第三阳极之间。
基于上述显示面板1，本申请还提供一种显示装置。
该显示装置可以为手机、平板电脑、车载显示屏等的显示装置。
显示装置包括：
设备本体，具有器件区；
以及上述任一显示面板，覆盖在设备本体上；
其中，器件区位于显示面板的透明显示区10a下方，且器件区中设置有透过透明显示区10a发射或者采集光线的感光器件。
感光器件可以包括：摄像头和/或光线感应器。光线感应器可以包括：虹膜识别传感器以及指纹识别传感器中的一种或组合。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本申请的保护范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请的保护范围应以所附权利要求为准。

Claims (20)

  1. 一种显示面板，包括透明显示区与非透明显示区，所述显示面板至少包括第一阴极与第二阴极，所述透明显示区对应所述第一阴极，所述非透明显示区对应所述第二阴极；所述第一阴极的功函数大于所述第二阴极的功函数，所述第一阴极与所述第二阴极的功函数范围分别为3.8eV-4.1eV。
  2. 根据权利要求1所述的显示面板，其中，所述第一阴极与所述第二阴极包含金属镁和金属银；
    所述第一阴极中金属镁的体积占比范围为10％-20％；和/或所述第二阴极中金属镁的体积占比范围为8％-20％。
  3. 根据权利要求2所述的显示面板，其中，所述第二阴极中金属镁的体积占比为10％。
  4. 根据权利要求2所述的显示面板，其中，所述第一阴极的厚度小于所述第二阴极的厚度；
    所述第一阴极的厚度范围为
    Figure PCTCN2019107918-appb-100001
    和/或所述第二阴极的厚度范围为
    Figure PCTCN2019107918-appb-100002
  5. 根据权利要求4所述的显示面板，所述第一阴极的厚度范围为
    Figure PCTCN2019107918-appb-100003
    和/或所述第二阴极的厚度范围为
    Figure PCTCN2019107918-appb-100004
  6. 根据权利要求1所述的显示面板，其中，所述第一阴极包含金属铝和金属银，所述第二阴极包含金属镁和金属银；
    所述第一阴极中金属铝的体积占比范围为2％-12％和/或所述第二阴极中金属镁的体积占比范围为8％-20％。
  7. 根据权利要求6所述的显示面板，其中，所述第一阴极中金属铝的体积占比范围为2％-6％；和/或所述第二阴极中金属镁的体积占比为10％。
  8. 根据权利要求6所述的显示面板，其中，所述第一阴极的厚度小于所述第二阴极的厚度；
    所述第一阴极的厚度范围为
    Figure PCTCN2019107918-appb-100005
    和/或所述第二阴极的厚度范围为
    Figure PCTCN2019107918-appb-100006
  9. 根据权利要求8所述的显示面板，其中，所述第一阴极的厚度范围为
    Figure PCTCN2019107918-appb-100007
    和/或所述第二阴极的厚度范围为
    Figure PCTCN2019107918-appb-100008
  10. 根据权利要求1所述的显示面板，其中，所述第一阴极包含金属镁、金属铝和金属银，所述第二阴极包含金属镁和金属银；
    所述第一阴极中金属镁的体积占比范围为5％-10％，所述第一阴极中金属铝的体积占 比范围为1％-6％；和/或所述第二阴极中金属镁的体积占比范围为8％-20％。
  11. 根据权利要求10所述的显示面板，其中，所述第一阴极中金属铝的体积占比范围为1％-3％；和/或所述第二阴极中金属镁的体积占比为10％。
  12. 根据权利要求1所述的显示面板，还包括位于所述透明显示区与所述非透明显示区之间的过渡区，所述显示面板还包括第三阴极，所述过渡区对应所述第三阴极，所述第三阴极的材质及厚度与所述第二阴极的材质及厚度分别相同。
  13. 根据权利要求1所述的显示面板，还包括第一阳极和第二阳极，所述透明显示区对应所述第一阳极，所述非透明显示区对应所述第二阳极；所述第一阳极为透光阳极，所述第二阳极为反射阳极，所述反射阳极包括透光层与反射层。
  14. 根据权利要求13所述的显示面板，所述透光阳极的功函数范围为4.4eV-5eV，所述透光层的功函数范围为4.4eV-5eV。
  15. 根据权利要求13所述的显示面板，所述反射阳极的反射率范围为90％-100％。
  16. 根据权利要求13所述的显示面板，还具有位于所述透明显示区与所述非透明显示区之间的过渡区，所述显示面板还包括第三阳极，所述过渡区对应所述第三阳极，所述第三阳极与所述第二阳极的材质相同。
  17. 根据权利要求13所述的显示面板，还包括第一OLED发光材料层和第二OLED发光材料层，所述透明显示区对应所述第一OLED发光材料层，所述非透明显示区对应所述第二OLED发光材料层；
    所述第一OLED发光材料层设置在所述第一阴极与所述第一阳极之间；
    所述第二OLED发光材料层设置在所述第二阴极与所述第二阳极之间。
  18. 根据权利要求16所述的显示面板，还包括第三OLED发光材料层，所述过渡区对应所述第三OLED发光材料层；所述第三OLED发光材料层设置在所述第三阴极与所述第三阳极之间。
  19. 一种显示装置，包括：
    设备本体，具有器件区；
    以及根据权利要求1所述的显示面板，所述显示面板覆盖在所述设备本体上；
    其中，所述器件区位于所述显示面板的所述透明显示区下方，且所述器件区中设置有透过所述透明显示区发射或者采集光线的感光器件。
  20. 根据权利要求19所述的显示装置，其中，所述感光器件包括摄像头和/或光线感应器。
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