WO2022179194A1 - Oled显示基板及其制作方法、色偏调整方法、显示装置 - Google Patents

Oled显示基板及其制作方法、色偏调整方法、显示装置 Download PDF

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WO2022179194A1
WO2022179194A1 PCT/CN2021/130562 CN2021130562W WO2022179194A1 WO 2022179194 A1 WO2022179194 A1 WO 2022179194A1 CN 2021130562 W CN2021130562 W CN 2021130562W WO 2022179194 A1 WO2022179194 A1 WO 2022179194A1
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light extraction
light
extraction layer
layer
sub
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PCT/CN2021/130562
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English (en)
French (fr)
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仝勋飞
高栋雨
赵根
刘刚虎
李会会
聂汉
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京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to US17/913,302 priority Critical patent/US20230143068A1/en
Publication of WO2022179194A1 publication Critical patent/WO2022179194A1/zh

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • 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
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • 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
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • 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
    • H10K59/875—Arrangements for extracting light from the devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/351—Thickness

Definitions

  • the present disclosure relates to the technical field of display product fabrication, and in particular, to an OLED display substrate, a fabrication method thereof, and a display device with a color shift adjustment method.
  • OLED Due to its unique advantages such as self-luminescence, fast response, low energy consumption, lightweight and ultra-thin, flexible and transparent, healthy and environmentally friendly, and wide color gamut, OLED has gradually become a new generation of mainstream display technology. Color shift and efficiency, as the two major evaluation indicators of OLED products, determine the overall performance of the product and become the main research direction of OLED devices.
  • the light emitting side of the OLED display device emits light, and part of the light with a large incident angle will be reflected back into the OLED display device and cannot go out. Therefore, a light extraction layer can be added outside the light-emitting side of the OLED display device to change the traveling route of the light, so as to reduce the light confined in the OLED display device.
  • the light extraction layer is a plate-like structure, that is, the thickness of the light extraction layer corresponding to the R/G/B sub-pixel is uniform, but due to the optical characteristics of the R/G/B monochromatic light (CIE, Eff., L-Decay, etc.) vary with the thickness of the light extraction layer. By changing the overall thickness of the light extraction layer, only a single direction of color shift adjustment can be achieved at present.
  • the present disclosure provides an OLED display substrate, a manufacturing method thereof, a color shift adjustment method, and a display device, which solve the problem of a single color shift adjustment direction.
  • an OLED display substrate comprising:
  • a light-emitting structure layer disposed on one side of the base substrate, includes a plurality of pixel units, and each of the pixel units includes a plurality of sub-pixels;
  • the light extraction structure is arranged on the light exit side of the light emitting structure layer, the light extraction structure includes a plurality of light extraction layers corresponding to a plurality of the sub-pixels one-to-one, and each of the light extraction layers is on the substrate
  • the orthographic projection on the substrate covers the corresponding sub-pixels, the light extraction layers corresponding to the sub-pixels of the same color have the same thickness, and the plurality of light extraction layers at least include the first sub-pixel corresponding to the first color.
  • a light extraction layer, the thickness of the first light extraction layer is different from the thickness of the light extraction layer corresponding to the sub-pixels of other colors, so that the OLED display substrate exhibits a predetermined color under a predetermined viewing angle.
  • the thickness of the light extraction layer is
  • the plurality of light extraction layers have a single-layer structure, and the refractive indices of the plurality of light extraction layers are different.
  • a plurality of the light extraction layers have a single-layer structure, and the refractive indices of the plurality of the light extraction layers are the same.
  • a plurality of the light extraction layers have a single-layer structure, and the plurality of the light extraction layers are independently formed by multiple processes.
  • the plurality of light extraction layers have a double-layer structure, and the plurality of light extraction layers include a first sub-light extraction layer with the same thickness and a second sub-light extraction layer with different thicknesses.
  • the first sub-light extraction layers of the plurality of light extraction layers are formed by a synchronous process.
  • the refractive index of the first sub-light extraction layer and the refractive index of the second sub-light extraction layer are different.
  • the refractive index of the first sub-light extraction layer and the refractive index of the second sub-light extraction layer are the same.
  • the light extraction structure includes a first light extraction layer, a second light extraction layer, and a third light extraction layer
  • the first light extraction layer corresponds to the first sub-pixel having the first color
  • the second light extraction layer corresponds to the first sub-pixel having the first color
  • the light extraction layer corresponds to the second sub-pixel with the second color
  • the third light extraction layer corresponds to the third sub-pixel with the third color
  • the first light extraction layer, the second light extraction layer and the The thickness of the third light extraction layer varies.
  • the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The OLED display substrate is made blue-blue at a preset viewing angle.
  • the preset viewing angle is 35-60 degrees.
  • the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The light efficiency of the OLED display substrate is 61cd/A, and the color shift of the OLED display substrate at a preset viewing angle is less than 4.8JNCD.
  • the light emitting structure layer includes an anode, a hole injection layer, a light emitting layer, an electron transport layer, and a cathode arranged in sequence, and the light extraction structure is formed on a side of the cathode away from the base substrate.
  • an encapsulation layer is formed on a side of the light extraction structure away from the cathode.
  • Embodiments of the present disclosure also provide a display device including the above-mentioned OLED display substrate.
  • Embodiments of the present disclosure also provide a display device, including the above-mentioned display panel.
  • Embodiments of the present disclosure also provide a method for fabricating an OLED display substrate for fabricating the above-mentioned OLED display substrate.
  • the OLED display substrate includes a plurality of pixel units, each of which includes a plurality of sub-pixels, and the method for fabricating an OLED display substrate Include the following steps:
  • a light extraction structure is formed on the light exit side of the light emitting structure layer, the light extraction structure includes a plurality of light extraction layers corresponding to a plurality of sub-pixels one-to-one, and each of the light extraction layers is on the positive side of the base substrate.
  • the projection covers the corresponding sub-pixels, the thicknesses of the light-extracting layers corresponding to the sub-pixels of the same color are the same, and the plurality of the light-extracting layers at least include the first light corresponding to the first sub-pixels of the first color.
  • an extraction layer the thickness of the first light extraction layer is different from the thickness of the light extraction layer corresponding to the sub-pixels of other colors.
  • the light extraction layer includes a first light extraction layer, a second light extraction layer and a third light extraction layer, the first light extraction layer corresponds to a first sub-pixel having a first color, and the second light extraction layer corresponds to a first sub-pixel having a first color.
  • the light extraction layer corresponds to the second sub-pixel with the second color, and the third light extraction layer corresponds to the third sub-pixel with the third color;
  • a plurality of the light extraction layers are single-layer structures
  • a light extraction layer is formed on the light-emitting side of the light-emitting structure layer, which specifically includes:
  • the first light extraction layer, the second light extraction layer and the third light extraction layer are sequentially formed by multiple evaporations using a mask.
  • the light extraction layer includes a first light extraction layer, a second light extraction layer and a third light extraction layer, the first light extraction layer corresponds to a first sub-pixel having a first color, and the second light extraction layer corresponds to a first sub-pixel having a first color.
  • the light extraction layer corresponds to the second sub-pixel with the second color, and the third light extraction layer corresponds to the third sub-pixel with the third color;
  • the light extraction layer has a double-layer structure, and a plurality of the light extraction layers include a first sub-light extraction layer with the same thickness and a second sub-light extraction layer with different thicknesses;
  • a light extraction layer is formed on the light-emitting side of the light-emitting structure layer, which specifically includes:
  • the second sub-light-extraction layers of each of the light-extraction layers are respectively formed on the light-exiting sides of the first sub-light-extraction layers.
  • the beneficial effects of the present disclosure are: by setting the light extraction layers corresponding to sub-pixels of different colors to different thicknesses, the proportion of light of different colors under a preset viewing angle can be changed, and not only can the large viewing angle be biased towards the yellow region It can also achieve full-tone multi-directional color shift adjustment.
  • Figure 1 shows a schematic diagram of the relationship between the thickness of the light extraction layer and the light extraction efficiency
  • Fig. 2 shows the schematic diagram 1 of the color shift trajectory under the light extraction layers of different thicknesses
  • FIG. 3 is a schematic diagram showing the relationship between the brightness attenuation of red light and the thickness of the light extraction layer under a viewing angle of 35 degrees;
  • FIG. 4 is a schematic diagram showing the relationship between the brightness attenuation of red light and the thickness of the light extraction layer under a viewing angle of 60 degrees;
  • FIG. 5 is a schematic diagram showing the relationship between the luminance attenuation of blue light and the thickness of the light extraction layer under a viewing angle of 35 degrees;
  • FIG. 6 is a schematic diagram showing the relationship between the brightness attenuation of blue light and the thickness of the light extraction layer under a viewing angle of 60 degrees;
  • Fig. 7 shows the schematic diagram 1 of the color shift trajectory under the combination of light extraction layers of different thicknesses
  • FIG. 8 is a schematic diagram showing the relationship between the light effect of red light and the thickness of the light extraction layer
  • FIG. 10 is a schematic diagram showing the relationship between the light effect of blue light and the thickness of the light extraction layer
  • FIG. 11 shows a second schematic diagram of the color shift trajectory under the combination of light extraction layers with different thicknesses.
  • the CPL (Capping Layer, light extraction layer) layer is usually located above the metal cathode. Its function is to form the first layer of protection for the cathode.
  • the high refractive index and low absorption coefficient of the material of the light extraction layer are also conducive to improving the device.
  • the light extraction layer is a common structure, that is, a flat plate structure formed by open mask evaporation.
  • the thickness of the light extraction layer corresponding to the R/G/B sub-pixel is the same, but due to the R/G/B monochromatic light
  • the respective optical characteristics (CIE, Eff., L-Decay, etc.) vary with the thickness of the light extraction layer. Therefore, changing the thickness of the light extraction layer can only achieve color shift adjustment in a single direction.
  • Each color shift track in 2 is formed by selecting the color shift values at the viewing angles of 0 degrees, 35 degrees, 45 degrees and 60 degrees. When the viewing angle of 0 degrees is the front view, there is no color shift. The greater the viewing angle, the greater the color shift. is large, the thickness of the light extraction layer corresponding to the first color shift track 100 in FIG.
  • the thickness of the light extraction layer corresponding to the second color shift track 200 is The thickness of the light extraction layer corresponding to the third color shift track 300 is: The thickness of the light extraction layer corresponding to the fourth color shift track 400 is: The thickness of the light extraction layer corresponding to the fifth color shift track 500 is:
  • the color shift values indicated by the dotted circle in FIG. 2 from the inside to the outside are 3.5JNCD, 4.8JNCD, and 7JNCD, respectively.
  • the overall luminous efficiency is not improved significantly (refer to FIG. 1 ). It can be seen that the optical adjustment ability of the light extraction layer in the form of a flat plate structure is limited.
  • This embodiment provides an OLED display substrate, including:
  • a light-emitting structure layer disposed on one side of the base substrate, includes a plurality of pixel units, and each of the pixel units includes a plurality of sub-pixels;
  • the light extraction structure is arranged on the light exit side of the light emitting structure layer, the light extraction structure includes a plurality of light extraction layers corresponding to a plurality of the sub-pixels one-to-one, and each of the light extraction layers is on the substrate
  • the orthographic projection on the substrate covers the corresponding sub-pixels, the light extraction layers corresponding to the sub-pixels of the same color have the same thickness, and the plurality of light extraction layers at least include the first sub-pixel corresponding to the first color.
  • a light extraction layer, the thickness of the first light extraction layer is different from the thickness of the light extraction layer corresponding to the sub-pixels of other colors, so that the OLED display substrate exhibits a predetermined color under a predetermined viewing angle.
  • the thickness of the light extraction layer is
  • the color shift of the white light of the product is mainly related to the proportion of the R/G/B monochromatic light components under the viewing angle, and the influence rule and influence of the thickness of the light extraction layer on the L-decay and other characteristics of the R/G/B monochromatic light at each viewing angle The degree is inconsistent.
  • Figure 3 shows a schematic diagram of the change in brightness of the red light at a viewing angle of 35 degrees with the thickness of the light extraction layer
  • Figure 4 shows the red light at a viewing angle of 60 degrees.
  • FIG. 1 a schematic diagram of the change in brightness attenuation with the thickness of the light extraction layer
  • Figure 5 shows a schematic diagram of the change in brightness attenuation of blue light with the thickness of the light extraction layer at a viewing angle of 35 degrees
  • Figure 6 shows a blue light at a viewing angle of 60 degrees.
  • FIG. 1 a schematic diagram of the change of brightness attenuation with the thickness of the light extraction layer. It can be seen from the figure that the L-Decay of red light is most affected by the thickness change of the light extraction layer. As the thickness of the light extraction layer increases, the L-Decay of red light gradually increases.
  • the thickness of the layers has different combinations.
  • the first trace in Figure 7 is the light extraction layer in the form of a flat plate structure (ie, the light extraction layer with the same thickness).
  • the color shift locus of white light under the light extraction layer formed by the combination of layers refer to the following table:
  • the first light extraction layer corresponds to red sub-pixels
  • the second light extraction layer corresponds to green sub-pixels
  • the third light extraction layer corresponds to blue sub-pixels.
  • the four nodes represented by the four circles on the trajectory line represent the preset viewing angles of 0 degrees, 35 degrees, 45 degrees and 60 degrees, respectively.
  • the preset viewing angle is the angle between the line of sight of the human eye and the OLED substrate.
  • the thickness of the light extraction layer of the OLED display substrate in this embodiment is no longer a flat structure, but is divided into different light extraction layers corresponding to sub-pixels of different colors, which can be adjusted according to the direction of color shift to be improved.
  • the thickness of the light extraction layer and the setting of different thicknesses of the light extraction layer can change the composition ratio of the R/G/B monochromatic light at the preset viewing angle, thereby improving the problem that the large viewing angle is biased to the yellow area.
  • the combination of thickness can realize full-tone multi-directional color shift adjustment.
  • the thickness of each light extraction layer can be adjusted, and the thickness of the first light extraction layer may be different from that of other light extraction layers, and the thicknesses of other light extraction layers may be the same or different.
  • a plurality of the light extraction layers have a single-layer structure, and the refractive indices of the plurality of the light extraction layers are different.
  • the optical effect of the light-extraction layer on R/G/B monochromatic light is related to the thickness of the light-extraction layer and the refractive index of the light-extraction layer. Changing at least one of these factors can improve the corresponding effect. In combination with the refractive index of the light extraction layer, the thinning of the light extraction layer can be achieved, and the overall product thinning can be further achieved.
  • a plurality of the light extraction layers have a single-layer structure, and the refractive indices of the plurality of the light extraction layers are the same.
  • a plurality of the light extraction layers have a single-layer structure, and a plurality of the light extraction layers are independently formed by multiple processes.
  • the plurality of light extraction layers have a double-layer structure, and the plurality of light extraction layers include a first sub-light extraction layer with the same thickness and a second sub-light extraction layer with different thicknesses.
  • the first sub-light extraction layers of the plurality of light extraction layers are formed by a synchronous process.
  • the refractive index of the first sub-light extraction layer and the refractive index of the second sub-light extraction layer are different.
  • the refractive index of the first sub-light extraction layer and the refractive index of the second sub-light extraction layer are the same.
  • the first sub-light extraction layer of each light extraction layer is firstly formed synchronously, and then the second sub-light extraction layer is formed.
  • the thickness of the first light extraction layer is the same as that of the second light extraction layer, the first light extraction layer and the second sub-light extraction layer in the second light extraction layer can be formed simultaneously, which simplifies the process steps.
  • the formation of the light extraction layer is not limited to the above, and each of the light extraction layers may be formed separately in different steps.
  • the light extraction layer includes a first light extraction layer, a second light extraction layer, and a third light extraction layer
  • the first light extraction layer corresponds to a first sub-pixel having a first color
  • the second light extraction layer corresponds to the second sub-pixel with the second color
  • the third light extraction layer corresponds to the third sub-pixel with the third color
  • the first light extraction layer, the second light extraction The thicknesses of the layers and the third light extraction layer vary.
  • the first color is red
  • the second color is green
  • the third color is blue, but not limited thereto.
  • the thickness of the first light extraction layer is a first preset value
  • the thickness of the second light extraction layer is a second preset value
  • the thickness of the third light extraction layer is The third preset value enables the light emitted by the first sub-pixel, the light emitted by the second sub-pixel, and the light emitted by the third sub-pixel to be mixed in a preset ratio, so that the OLED display substrate is in a preset
  • the preset color is displayed under the viewing angle.
  • the thickness of the first light extraction layer, the thickness of the second light extraction layer, and the thickness of the third light extraction layer are adjusted respectively, and can be adjusted according to the preset display color and the light
  • the relationship between the thickness of the extraction layer and the characteristics of each monochromatic light can be flexibly set, so as to adjust the proportion of the corresponding monochromatic light in the white light.
  • the thickness of the first light extraction layer corresponding to the red sub-pixel can be correspondingly increased to reduce the proportion of red light.
  • the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The OLED display substrate is made blue-blue at a preset viewing angle.
  • the thickness of the first light extraction layer, the thickness of the second light extraction layer and the thickness of the third light extraction layer can be combined with different thickness values to realize the color shift of different colors.
  • the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The OLED display substrate exhibits a green color shift, and the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The OLED display substrate exhibits a green color shift; the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The OLED display substrate exhibits a cyan color shift, and the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The OLED display substrate exhibits a cyan color shift; the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The OLED display substrate exhibits a blue-violet color
  • the thickness combination of the light extraction layer corresponding to the R/G/B sub-pixel is:
  • the red light L-Decay is fast, and the blue light L-Decay is slow, so that the red light component decreases and the blue light component increases at the preset viewing angle, so the color shift is biased to the cyan area at a large viewing angle, thereby improving the product's large viewing angle.
  • Partial yellowing problem (compare the first trajectory line 1 in Figure 7).
  • the improvement of the large viewing angle is mainly aimed at improving the color shift.
  • the preset viewing angle is 35-60 degrees, but it is not limited thereto.
  • the thickness of the first light extraction layer is a fourth preset value
  • the thickness of the second light extraction layer is a fifth preset value
  • the thickness of the third light extraction layer is the sixth preset value, so that the light emitted by the first sub-pixel, the light emitted by the second sub-pixel, and the light emitted by the third sub-pixel are mixed in a preset ratio, so as to make the light effect of the OLED display substrate is greater than the seventh preset value, and the color shift of the OLED display substrate under the preset viewing angle is smaller than the eighth preset value.
  • the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is The light efficiency of the OLED display substrate is 61cd/A, and the color shift of the OLED display substrate at a preset viewing angle is less than 4.8JNCD.
  • the power consumption of the product is directly related to the efficiency of the OLED device.
  • the thickness gradient of the light extraction layer As an example, to explore the variation law of Eff. of R/G/B monochromatic light, Figure 8 shows a schematic diagram of the change of the light effect of red light with the increase of the thickness of the light extraction layer, and Figure 9 shows that the light effect of green light changes with the light
  • Figure 10 shows a schematic diagram of the change of the light efficiency of blue light with the increase of the thickness of the light extraction layer. It can be seen from the figure that the efficiency of red light gradually increases with the increase of the thickness of the light extraction layer.
  • the efficiency of green light and the efficiency of blue light increase first and then decrease with the increase of the thickness of the light extraction layer, and the thickness of the light extraction layer is and , the efficiency is at its highest. Therefore, the thicknesses of the light extraction layers corresponding to the R/G/B sub-pixels are respectively set as That is, the thickness of the first light extraction layer is The thickness of the second light extraction layer is The thickness of the third light extraction layer is For white light synthesis, the color shift track refers to the eleventh track line 30 in FIG. 11. It can be seen from the figure that the light efficiency of the OLED display substrate under this condition is 61cd/A, and the overall thickness is Refer to the twelfth trajectory line 20 in FIG.
  • the thicknesses of the first light extraction layer, the second light extraction layer and the third light extraction layer are adjusted respectively, and the combination of different thicknesses of the first light extraction layer, the second light extraction layer and the third light extraction layer , can improve the light efficiency on the basis of better color shift.
  • the light emitting structure layer includes an anode, a hole injection/transport layer, a light emitting layer, an electron transport/injection layer, and a cathode arranged in sequence, and the light extraction structure is formed when the cathode is far from the one side of the base substrate.
  • an encapsulation layer is formed on a side of the light extraction structure away from the cathode.
  • Embodiments of the present disclosure further provide a color shift adjustment method for adjusting the color shift of the above-mentioned OLED display substrate, including:
  • the thicknesses of the different light extraction layers are adjusted according to the color that the OLED display substrate needs to display under a preset viewing angle.
  • the thickness of the different light extraction layers is adjusted according to the color that the OLED display substrate needs to display under the preset viewing angle, which specifically includes:
  • the thicknesses of the different light extraction layers are adjusted, so that the OLED display substrate exhibits a preset color under the preset viewing angle.
  • the thickness of the light extraction layer is three, so that the OLED display substrate exhibits a preset color at a preset viewing angle, and the thickness of the first light extraction layer, the second light extraction layer and the third light extraction layer The thickness can be adjusted independently, which can realize the adjustment of full color system.
  • the thickness of the different light extraction layers is adjusted, and the method further includes:
  • the thicknesses of the different light extraction layers are adjusted so that the OLED display substrate has a preset color under the preset viewing angle, and the light efficiency of the OLED display substrate is greater than the seventh preset value.
  • the thickness of the light extraction layer also has an impact on the light efficiency of the OLED display substrate, and different monochromatic light changes with the thickness of the light extraction layer, and the change law of the light efficiency is different, and the combination of different light extraction layers Under the thickness of 100,000, the brightness attenuation law and light effect change law of each monochromatic light can improve the light efficiency, and at the same time improve the color shift, and realize the effect that the OLED display substrate presents the preset color.
  • Embodiments of the present disclosure also provide a display device including the above-mentioned OLED display substrate.
  • Embodiments of the present disclosure also provide a method for fabricating an OLED display substrate for fabricating the above-mentioned OLED display substrate.
  • the OLED display substrate includes a plurality of pixel units, each of which includes a plurality of sub-pixels, and the method for fabricating an OLED display substrate Include the following steps:
  • a light extraction structure is formed on the light exit side of the light emitting structure layer, the light extraction structure includes a plurality of light extraction layers corresponding to a plurality of sub-pixels one-to-one, and each of the light extraction layers is on the positive side of the base substrate.
  • the projection covers the corresponding sub-pixels, the thicknesses of the light-extracting layers corresponding to the sub-pixels of the same color are the same, and the plurality of the light-extracting layers at least include the first light corresponding to the first sub-pixels of the first color.
  • an extraction layer the thickness of the first light extraction layer is different from the thickness of the light extraction layer corresponding to the sub-pixels of other colors.
  • the light extraction layer includes a first light extraction layer, a second light extraction layer, and a third light extraction layer
  • the first light extraction layer corresponds to a first sub-pixel having a first color
  • the second light extraction layer corresponds to a second sub-pixel having a second color
  • the third light extraction layer corresponds to a third sub-pixel having a third color
  • Each of the plurality of light extraction layers includes a first sub-light extraction layer, and at least the first sub-light extraction layer includes a second sub-light extraction layer disposed on the light outgoing side of the first sub-light extraction layer;
  • a plurality of the light extraction layers are single-layer structures
  • a light extraction layer is formed on the light-emitting side of the light-emitting structure layer, which specifically includes:
  • the first light extraction layer, the second light extraction layer and the third light extraction layer are sequentially formed by multiple evaporations using a mask.
  • the light extraction layer includes a first light extraction layer, a second light extraction layer, and a third light extraction layer
  • the first light extraction layer corresponds to a first sub-pixel having a first color
  • the second light extraction layer corresponds to a second sub-pixel having a second color
  • the third light extraction layer corresponds to a third sub-pixel having a third color
  • the light extraction layer has a double-layer structure, and a plurality of the light extraction layers include a first sub-light extraction layer with the same thickness and a second sub-light extraction layer with different thicknesses;
  • a light extraction layer is formed on the light-emitting side of the light-emitting structure layer, which specifically includes:
  • the second sub-light-extraction layers of each of the light-extraction layers are respectively formed on the light-exiting sides of the first sub-light-extraction layers.
  • a layer of thickness can be formed by vapor deposition first.
  • the secondary evaporation process forms the fabrication of the light extraction layer having the first light extraction layer, the second light extraction layer and the third light extraction layer, which simplifies the process steps and reduces the difficulty of the process.

Abstract

本公开涉及一种OLED显示基板，包括：衬底基板；发光结构层，设置于所述衬底基板的一侧；光取出层，设置于所述发光结构层的出光侧，其中，还包括多个像素单元，每个所述像素单元包括多个子像素，所述光取出层包括与多个子像素一一对应的多个光取出层，每个所述光取出层在所述衬底基板上的正投影覆盖对应的所述子像素，多个所述光取出层中，至少包括对应第一颜色的第一子像素的第一光取出层，所述第一光取出层的厚度与对应于其他颜色的子像素的所述光取出层的厚度不同，以使得OLED显示基板在预设视角下呈预设颜色。本公开还涉及一种色偏调整方法、显示装置以及OLED显示基板的制作方法。

Description

OLED显示基板及其制作方法、色偏调整方法、显示装置
相关申请的交叉引用
本申请主张在2021年02月26日在中国提交的中国专利申请号No.202110219199.7的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及显示产品制作技术领域，尤其涉及一种OLED显示基板及其制作方法、色偏调整方法显示装置。
背景技术
由于自发光、快响应、低能耗、轻质超薄、柔性透明、健康环保、宽色域等诸多独特的优势，OLED已逐渐成为新一代主流显示技术。色偏和效率作为OLED产品的两大评价指标决定着产品的综合性能，成为OLED器件的主要研究方向。
OLED显示器件中的出光侧发出光线，部分入射角大的光线会被反射回OLED显示器件内无法出去。因此，可在OLED显示器件出光侧的外部添加光取出层来改变光线的行进路线，以减少被局限在OLED显示器件内的光线。相关技术中，光取出层为平板状结构，即R/G/B子像素对应的光取出层的厚度是统一的，但是由于R/G/B单色光的光特性(CIE、Eff.、L-Decay等)随光取出层的厚度变化的规律不一致，通过改变光取出层的整体的厚度，目前只能实现单一方向上的色偏调整。
发明内容
为了解决上述技术问题，本公开提供一种OLED显示基板及其制作方法、色偏调整方法、显示装置，解决色偏调整方向单一的问题。
为了达到上述目的，本公开实施例采用的技术方案是：一种OLED显示基板，包括：
衬底基板；
发光结构层，设置于所述衬底基板的一侧，包括多个像素单元，每个所述 像素单元包括多个子像素；
光取出结构，设置于所述发光结构层的出光侧，所述光取出结构包括与多个所述子像素一一对应的多个光取出层，每个所述光取出层在所述衬底基板上的正投影覆盖对应的所述子像素，对应于相同颜色的子像素的光取出层的厚度相同，多个所述光取出层中，至少包括对应第一颜色的第一子像素的第一光取出层，所述第一光取出层的厚度与对应于其他颜色的子像素的所述光取出层的厚度不同，以使得OLED显示基板在预设视角下呈预设颜色。
可选的，所述光取出层的厚度为
Figure PCTCN2021130562-appb-000001
可选的，多个所述光取出层为单层结构，且多个所述光取出层的折射率不同。
可选的，多个所述光取出层为单层结构，且多个所述光取出层的折射率相同。
可选的，多个所述光取出层为单层结构，且多个所述光取出层采用多次工艺独立形成。
可选的，多个所述光取出层为双层结构，多个所述光取出层包括厚度相同的第一子光取出层和厚度不同的第二子光取出层。
可选的，多个所述光取出层的所述第一子光取出层采用同步工艺形成。
可选的，所述第一子光取出层的折射率和所述第二子光取出层的折射率不同。
可选的，所述第一子光取出层的折射率和所述第二子光取出层的折射率相同。
可选的，所述光取出结构包括第一光取出层、第二光取出层和第三光取出层，所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素，所述第一光取出层、所述第二光取出层和所述第三光取出层的厚度各不相同。
可选的，所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000002
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000003
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000004
使得OLED显示基板在预设视角下呈青蓝色。
可选的，所述预设视角为35-60度。
可选的，所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000005
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000006
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000007
使得OLED显示基板的光效为61cd/A，且OLED显示基板在预设视角下的色偏小于4.8JNCD。
可选的，所述发光结构层包括依次设置的阳极、空穴注入层、发光层、电子传输层、阴极，所述光取出结构形成于所述阴极远离所述衬底基板的一侧。
可选的，所述光取出结构远离所述阴极的一侧形成有封装层。
本公开实施例还提供一种显示装置，包括上述的OLED显示基板。
本公开实施例还提供一种显示装置，包括上述的显示面板。
本公开实施例还提供一种OLED显示基板的制作方法，用于制作上述的OLED显示基板，OLED显示基板包括多个像素单元，每个所述像素单元包括多个子像素，OLED显示基板的制作方法包括以下步骤：
提供一衬底基板；
在所述衬底基板的一侧形成发光结构层；
在所述发光结构层的出光侧形成光取出结构，所述光取出结构包括与多个子像素一一对应的多个光取出层，每个所述光取出层在所述衬底基板上的正投影覆盖对应的所述子像素，对应于相同颜色的子像素的所述光取出层的厚度相同，多个所述光取出层中，至少包括对应第一颜色的第一子像素的第一光取出层，所述第一光取出层的厚度与对应于其他颜色的子像素的所述光取出层的厚度不同。
可选的，所述光取出层包括第一光取出层、第二光取出层和第三光取出层，所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素；
多个所述光取出层为单层结构；
在所述发光结构层的出光侧形成光取出层，具体包括：
采用掩膜板多次蒸镀依次形成所述第一光取出层、所述第二光取出层和所述第三光取出层。
可选的，所述光取出层包括第一光取出层、第二光取出层和第三光取出层， 所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素；
所述光取出层为双层结构，多个所述光取出层包括厚度相同的第一子光取出层和厚度不同的第二子光取出层；
在所述发光结构层的出光侧形成光取出层，具体包括：
形成多个所述光取出层中的所述第一子光取出层；
在所述第一子光取出层的出光侧分别形成各所述光取出层的所述第二子光取出层。
本公开的有益效果是：通过将不同颜色的子像素对应的光取出层设置为不同的厚度，从而可以改变预设视角下不同颜色的光的占比，不但可以改善大视角色偏偏向黄色区域的问题，还可以实现全色调多方向的色偏调整。
附图说明
图1表示光取出层的厚度与出光光效关系示意图；
图2表示不同厚度的光取出层下的色偏轨迹示意图一；
图3表示35度视角下红色光的亮度衰减与光取出层的厚度的关系示意图；
图4表示60度视角下红色光的亮度衰减与光取出层的厚度的关系示意图；
图5表示35度视角下蓝色光的亮度衰减与光取出层的厚度的关系示意图；
图6表示60度视角下蓝色光的亮度衰减与光取出层的厚度的关系示意图；
图7表示不同厚度的光取出层的组合下色偏轨迹示意图一；
图8表示红色光的光效与光取出层的厚度的关系示意图；
图9表示绿色光的光效与光取出层的厚度的关系示意图；
图10表示蓝色光的光效与光取出层的厚度的关系示意图；
图11表示不同厚度的光取出层的组合下色偏轨迹示意图二。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的 本公开的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开保护的范围。
在本公开的描述中，需要说明的是，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，术语“第一”、“第二”、“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性。
CPL(Capping Layer，光取出层)层通常位于金属阴极上方，其作用首先是对阴极形成了第一层保护；另外光取出层的材料的高折射率、低吸光系数的特性也有利于提升器件的光取出效率；此外，通过改变光取出层的厚度调整微腔长度，可以对器件的色偏及效率进行调整。相关技术中，光取出层为Common结构，即采用Open Mask蒸镀形成的平板结构，R/G/B子像素对应的光取出层的厚度是相同的，但由于R/G/B单色光各自的光特性(CIE、Eff.、L-Decay等)随光取出层的厚度变化的规律不一致，因此，改变光取出层的厚度只能实现单一方向上的色偏调整，参考图2，图2中每一条色偏轨迹均是选择视角为0度、35度、45度和60度下的色偏值形成，0度视角即正视时，是不存在色偏的，视角越大色偏越大，图2中第一色偏轨迹100对应的光取出层厚度为
Figure PCTCN2021130562-appb-000008
第二色偏轨迹200对应的光取出层厚度为
Figure PCTCN2021130562-appb-000009
第三色偏轨迹300对应的光取出层厚度为
Figure PCTCN2021130562-appb-000010
第四色偏轨迹400对应的光取出层厚度为
Figure PCTCN2021130562-appb-000011
第五色偏轨迹500对应的光取出层厚度为
Figure PCTCN2021130562-appb-000012
图2中的虚线环形由内到外分别表示的色偏值为3.5JNCD、4.8JNCD、7JNCD。且伴随光取出层的厚度的增加，整体发光效率提升不显著(参考图1)，可见，平板结构形式的光取出层对光学的调节能力受到局限。
本实施例提供一种OLED显示基板，包括：
衬底基板；
发光结构层，设置于所述衬底基板的一侧，包括多个像素单元，每个所述像素单元包括多个子像素；
光取出结构，设置于所述发光结构层的出光侧，所述光取出结构包括与多 个所述子像素一一对应的多个光取出层，每个所述光取出层在所述衬底基板上的正投影覆盖对应的所述子像素，对应于相同颜色的子像素的光取出层的厚度相同，多个所述光取出层中，至少包括对应第一颜色的第一子像素的第一光取出层，所述第一光取出层的厚度与对应于其他颜色的子像素的所述光取出层的厚度不同，以使得OLED显示基板在预设视角下呈预设颜色。
本实施例中示例性的，所述光取出层的厚度为
Figure PCTCN2021130562-appb-000013
产品白光色偏主要与视角下R/G/B单色光成分占比相关，而光取出层的厚度对R/G/B单色光的各视角下L-decay等特性的影响规律及影响程度不一致。以所述光取出层的厚度梯度
Figure PCTCN2021130562-appb-000014
为例，探究单色光的L-Decay变化规律，图3表示的是红色光在35度视角下，随着光取出层的厚度亮度衰减变化示意图，图4表示的是红色光在60度视角下，随着光取出层的厚度亮度衰减变化示意图，图5表示的是蓝色光在35度视角下，随着光取出层的厚度亮度衰减变化示意图，图6表示的是蓝色光在60度视角下，随着光取出层的厚度亮度衰减变化示意图，由图可知，红色光的L-Decay受光取出层的厚度变化影响最大，随着光取出层的厚度的增加，红色光的L-Decay逐渐变快，对应视角下红色光成分减少；而绿色光和蓝色光受光取出层的厚度变化影响相对减弱，并且随着光取出层的厚度的增加呈现抛物线规律，即L-Decay先变快后变慢。将R/G/B子像素对应的光取出层的以不同的厚度进行组合，组合方案存在多种可能，每种方案对应视角下R/G/B单色光的成分比例不同，进行白光合成可得多种色偏轨迹，如图7所示，图7中表示出了本实施例OLED器件可以形成的部分色偏轨迹，对应于不同的色偏轨迹，光取出层中的不同的光取出层的厚度具有不同的组合方式，图7中第一轨迹线为平板结构形式的光取出层(即厚度相同的光取出层)下白光色偏水平，而其余轨迹线则为厚度不同的光取出层进行组合形成的光取出层下的白光色偏轨迹，参考下表：
Figure PCTCN2021130562-appb-000015
Figure PCTCN2021130562-appb-000016
需要说明的是，上述表格中，所述第一光取出层对应的是红色子像素，第二光取出层对应的是绿色子像素，第三光取出层对应的是蓝色子像素，每条轨迹线上的四个圆圈表示的4个节点，分别表示预设视角为0度、35度、45度和60度，通过调整R/G/B子像素对应的光取出层的厚度，实现不同色调的色偏轨迹调整，满足不同客户对色偏方向的不同需求。
需要说明的是，所述预设视角即为人眼视线与OLED衬底基板之间的角度。
本实施例中的OLED显示基板的光取出层的厚度不再是平板式结构，而是对应于不同颜色的子像素划分为不同的光取出层，可以根据所需改善的色偏方向调整相应的光取出层的厚度，不同的光取出层的不同厚度的设置，可以改变预设视角下R/G/B单色光的成分占比，从而改善大视角色偏偏向黄色区域问题，并且通过不同的厚度组合，可以实现全色调多方向的色偏调整。
根据不同的需要，每个光取出层的厚度可调，可以是所述第一光取出层的厚度与其他光取出层的厚度不同，而其他光取出层的厚度可以相同，也可以不同。
本实施例中示例性的，多个所述光取出层为单层结构，且多个所述光取出层的折射率不同。
所述光取出层对R/G/B单色光的光学作用，和所述光取出层的厚度有关，和所述光取出层的折射率也有关，改变其中至少一个因素即可达到改善相应的单色光的出光特性的目的，而结合所述光取出层的所述折射率，可以实现所述光取出层的减薄，进一步的实现产品整体的减薄。
本实施例中示例性的，多个所述光取出层为单层结构，且多个所述光取出 层的折射率相同。
本实施例中示例性的，多个所述光取出层为单层结构，且多个所述光取出层采用多次工艺独立形成。
本实施例中示例性的，多个所述光取出层为双层结构，多个所述光取出层包括厚度相同的第一子光取出层和厚度不同的第二子光取出层。
本实施例中示例性的，多个所述光取出层的所述第一子光取出层采用同步工艺形成。
本实施例中示例性的，所述第一子光取出层的折射率和所述第二子光取出层的折射率不同。
本实施例中示例性的，所述第一子光取出层的折射率和所述第二子光取出层的折射率相同。
本实施例中，在形成所述光取出层时，先同步形成各个所述光取出层的所述第一子光取出层，然后在形成所述第二子光取出层，若存在和所述第一光取出层的厚度相同的第二光取出层时，所述第一光取出层和所述第二光取出层中的第二子光取出层可同步形成，简化工艺步骤。
当然，所述光取出层的形成并不限于上述所述，也可以在不同工序中分别形成各所述光取出层。
本实施例中示例性的，所述光取出层包括第一光取出层、第二光取出层和第三光取出层，所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素，所述第一光取出层、所述第二光取出层和所述第三光取出层的厚度各不相同。
所述第一颜色为红色，所述第二颜色为绿色，所述第三颜色为蓝色，但并不以此为限。
本实施例中示例性的，所述第一光取出层的厚度为第一预设值，所述第二光取出层的厚度为第二预设值，所述第三光取出层的厚度为第三预设值，使得所述第一子像素发出的光、所述第二子像素发出的光、所述第三子像素发出的光以预设比例混合，以使得OLED显示基板在预设视角下呈预设颜色。
本实施例中，所述第一光取出层的厚度、所述第二光取出层的厚度和所述 第三光取出层的厚度是分别进行调整的，可以根据预设显示颜色以及所述光取出层的厚度与各单色光的特性的关系灵活进行设置，从而调整白光中相应的单色光的所占比例，例如，若实现偏绿色调，由于红色光随着光取出层的厚度的增加而亮度衰减逐渐增大，因此，可以相应的增加对应红色子像素的所述第一光取出层的厚度，以减少红色光的占比。
本实施例中示例性的，所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000017
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000018
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000019
使得OLED显示基板在预设视角下呈青蓝色。
所述第一光取出层的厚度、所述第二光取出层的厚度和所述第三光取出层的厚度以不同的厚度值进行组合可以实现不同颜色的色偏，本实施例的一实施方式中，所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000020
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000021
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000022
OLED显示基板呈绿色调色偏，所述第一光取出层的的厚度为
Figure PCTCN2021130562-appb-000023
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000024
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000025
OLED显示基板呈绿色调色偏；所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000026
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000027
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000028
OLED显示基板呈青色调色偏，所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000029
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000030
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000031
OLED显示基板呈青色调色偏；所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000032
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000033
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000034
OLED显示基板呈蓝紫色色偏，所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000035
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000036
Figure PCTCN2021130562-appb-000037
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000038
OLED显示基板呈篮紫色调色偏；所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000039
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000040
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000041
OLED显示基板呈粉色调色偏；所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000042
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000043
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000044
OLED显示基板呈暖白色调色偏，所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000045
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000046
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000047
OLED显示基板呈暖白色调色偏。
如图7中第三轨迹线3，R/G/B子像素对应的光取出层的厚度组合为
Figure PCTCN2021130562-appb-000048
红色光L-Decay较快，蓝色光L-Decay较慢，使预设视角 下红色光成分减少而蓝色光成分增多，因此其色偏在大视角下偏向青蓝色区域，从而改善产品大视角色偏发黄问题(对比图7中第一轨迹线1)。
视角越大，越容易发生色偏，本实施例中主要针对大视角色偏的改善，以具体实施方式中，所述预设视角为35-60度，但并不以此为限。
本实施例中示例性的，所述第一光取出层的厚度为第四预设值，所述第二光取出层的厚度为第五预设值，所述第三光取出层的厚度为第六预设值，使得所述第一子像素发出的光、所述第二子像素发出的光、所述第三子像素发出的光以预设比例混合，以使得OLED显示基板的光效大于第七预设值，且OLED显示基板在预设视角下的色偏小于第八预设值。
本实施例中示例性的，所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000049
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000050
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000051
使得OLED显示基板的光效为61cd/A，且OLED显示基板在预设视角下的色偏小于4.8JNCD。
产品的功耗与OLED器件的效率直接相关，通过调整光取出层的厚度改变微腔长度增强微腔效应，可实现发光效率的提升。以光取出层的厚度梯度为
Figure PCTCN2021130562-appb-000052
为例，探究R/G/B单色光的Eff.变化规律，图8表示红色光的光效随着光取出层的厚度的增加的变化示意图，图9表示绿色光的光效随着光取出层的厚度的增加的变化示意图，图10表示蓝色光的光效随着光取出层的厚度的增加的变化示意图，由图可知，红色光的效率随着光取出层的厚度的增加逐渐提升，绿色光的效率及蓝色光的效率(E/By)随着光取出层的厚度的增加呈先上升后下降趋势，且分别在光取出层的厚度为
Figure PCTCN2021130562-appb-000053
及
Figure PCTCN2021130562-appb-000054
时，效率达到最高。因此将R/G/B子像素对应的光取出层的厚度分别设定为
Figure PCTCN2021130562-appb-000055
即所述第一光取出层的厚度为
Figure PCTCN2021130562-appb-000056
所述第二光取出层的厚度为
Figure PCTCN2021130562-appb-000057
所述第三光取出层的厚度为
Figure PCTCN2021130562-appb-000058
进行白光合成，色偏轨迹参考图11中的第十一轨迹线30，由图可知该条件下OLED显示基板的光效为61cd/A，整体厚度为
Figure PCTCN2021130562-appb-000059
的光取出层的条件下的色片轨迹参考图11中的第十二轨迹线20，效率提升9％，功耗降低8％；并且对应色偏较优，使得且OLED显示基板在预设视角下的色偏小于4.8JNCD(并不以此为限)。图11中三个虚线环由内向外表示色偏值分别为3.5JNCD、4.8JNCD、7.0JNCD，具体对比参考以下表格。
Figure PCTCN2021130562-appb-000060
由以上表格可以看出，分别调节第一光取出层、第二光取出层和第三光取出层的厚度，第一光取出层、第二光取出层和第三光取出层不同厚度的组合，可以在色偏较优的基础上，提高光效。
本实施例中示例性的，所述发光结构层包括依次设置的阳极、空穴注入/传输层、发光层、电子传输/注入层、阴极，所述光取出结构形成于所述阴极远离所述衬底基板的一侧。
本实施例中示例性的，所述光取出结构远离所述阴极的一侧形成有封装层。
本公开实施例还提供一种色偏调整方法，用于调整上述的OLED显示基板的色偏，包括：
根据预设视角下OLED显示基板所需显示的颜色，调整不同所述光取出层的厚度。
本实施例中，根据预设视角下OLED显示基板所需显示的颜色，调整不同所述光取出层的厚度，具体包括：
获得在预设视角下光取出层的厚度与不同颜色的单色光的亮度衰减关系(参考图3-图6)；
根据所述亮度衰减关系，调整不同的所述光取出层的厚度，使得OLED显示基板在所述预设视角下呈预设颜色。
参照红色光、绿色光和蓝色光各单色光随着光取出层的厚度的增加而产生的亮度衰减规律，分别调整所述第一光取出层、所述第二光取出层和所述第三光取出层的厚度，以使得OLED显示基板在预设视角下呈现预设的颜色，且通过对所述第一光取出层、所述第二光取出层和所述第三光取出层的厚度分别进行独立调整，可以实现全色系的调整。
本实施例中，根据预设视角下OLED显示基板所需显示的颜色，调整不同所述光取出层的厚度，还包括：
获得在预设视角下所述光取出层的厚度与不同颜色的单色光的光效的关系(参考图8-图10)；
调整不同的所述光取出层的厚度，使得OLED显示基板在所述预设视角下呈预设颜色，且使得OLED显示基板的光效大于第七预设值。
所述光取出层的厚度对OLED显示基板的光效也有影响，且不同的单色光随着光取出层的厚度的改变，其光效的变化规律是不同的，结合在不同的光取出层的厚度下，各单色光的亮度衰减规律和光效变化规律，可以实现提高光效，同时改善色偏，实现OLED显示基板呈现预设颜色的效果。
本公开实施例还提供一种显示装置，包括上述的OLED显示基板。
本公开实施例还提供一种OLED显示基板的制作方法，用于制作上述的OLED显示基板，OLED显示基板包括多个像素单元，每个所述像素单元包括多个子像素，OLED显示基板的制作方法包括以下步骤：
提供一衬底基板；
在所述衬底基板的一侧形成发光结构层；
在所述发光结构层的出光侧形成光取出结构，所述光取出结构包括与多个子像素一一对应的多个光取出层，每个所述光取出层在所述衬底基板上的正投影覆盖对应的所述子像素，对应于相同颜色的子像素的所述光取出层的厚度相同，多个所述光取出层中，至少包括对应第一颜色的第一子像素的第一光取出层，所述第一光取出层的厚度与对应于其他颜色的子像素的所述光取出层的厚度不同。
本实施例中示例性的，所述光取出层包括第一光取出层、第二光取出层和第三光取出层，所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素；
多个所述光取出层均包括第一子光取出层，至少所述第一光取出层包括设置于所述第一子光取出层的出光侧的第二子光取出层；
多个所述光取出层为单层结构；
在所述发光结构层的出光侧形成光取出层，具体包括：
采用掩膜板多次蒸镀依次形成所述第一光取出层、所述第二光取出层和所 述第三光取出层。
本实施例中示例性的，所述光取出层包括第一光取出层、第二光取出层和第三光取出层，所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素；
所述光取出层为双层结构，多个所述光取出层包括厚度相同的第一子光取出层和厚度不同的第二子光取出层；
在所述发光结构层的出光侧形成光取出层，具体包括：
形成多个所述光取出层中的所述第一子光取出层；
在所述第一子光取出层的出光侧分别形成各所述光取出层的所述第二子光取出层。
采用上述方案，在所述第一光取出层的厚度和第二光取出层的厚度相同，且第一光取出层的厚度小于第三光取出层的厚度时，可以先蒸镀形成一层厚度与所述第一光取出层的厚度相同的第一子光取出层，然后再在所述第一子光取出层上形成所述第三光取出层中的第二子光取出层，通过两次蒸镀工艺形成了具有第一光取出层、第二光取出层和第三光取出层的光取出层的制作，简化工艺步骤，降低工艺难度。
以上所述为本公开较佳实施例，需要说明的是，对于本领域普通技术人员来说，在不脱离本公开所述原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本公开保护范围。

Claims (19)

  1. 一种OLED显示基板，包括：
    衬底基板；
    发光结构层，设置于所述衬底基板的一侧，包括多个像素单元，每个所述像素单元包括多个子像素；
    光取出结构，设置于所述发光结构层的出光侧，其中，所述光取出结构包括与多个所述子像素一一对应的多个光取出层，每个所述光取出层在所述衬底基板上的正投影覆盖对应的所述子像素，对应于相同颜色的子像素的光取出层的厚度相同，多个所述光取出层中，至少包括对应第一颜色的第一子像素的第一光取出层，所述第一光取出层的厚度与对应于其他颜色的子像素的所述光取出层的厚度不同，以使得OLED显示基板在预设视角下呈预设颜色。
  2. 根据权利要求1所述的OLED显示基板，其中，所述光取出层的厚度为
    Figure PCTCN2021130562-appb-100001
  3. 根据权利要求1所述的OLED显示基板，其中，多个所述光取出层为单层结构，且多个所述光取出层的折射率不同。
  4. 根据权利要求1所述的OLED显示基板，其中，多个所述光取出层为单层结构，且多个所述光取出层的折射率相同。
  5. 根据权利要求1所述的OLED显示基板，其中，多个所述光取出层为单层结构，且多个所述光取出层采用多次工艺独立形成。
  6. 根据权利要求1所述的OLED显示基板，其中，多个所述光取出层为双层结构，多个所述光取出层包括厚度相同的第一子光取出层和厚度不同的第二子光取出层。
  7. 根据权利要求6所述的OLED显示基板，其中，多个所述光取出层的所述第一子光取出层采用同步工艺形成。
  8. 根据权利要求6所述的OLED显示基板，其中，所述第一子光取出层的折射率和所述第二子光取出层的折射率不同。
  9. 根据权利要求6所述的OLED显示基板，其中，所述第一子光取出层的折射率和所述第二子光取出层的折射率相同。
  10. 根据权利要求1所述的OLED显示基板，其中，所述光取出结构包括第一光取出层、第二光取出层和第三光取出层，所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素，所述第一光取出层、所述第二光取出层和所述第三光取出层的厚度各不相同。
  11. 根据权利要求10所述的OLED显示基板，其中，所述第一光取出层的厚度为
    Figure PCTCN2021130562-appb-100002
    所述第二光取出层的厚度为
    Figure PCTCN2021130562-appb-100003
    所述第三光取出层的厚度为
    Figure PCTCN2021130562-appb-100004
    使得OLED显示基板在预设视角下呈青蓝色。
  12. 根据权利要求11所述的OLED显示基板，其中，所述预设视角为35-60度。
  13. 根据权利要求10所述的OLED显示基板，其中，所述第一光取出层的厚度为
    Figure PCTCN2021130562-appb-100005
    所述第二光取出层的厚度为
    Figure PCTCN2021130562-appb-100006
    所述第三光取出层的厚度为
    Figure PCTCN2021130562-appb-100007
    使得OLED显示基板的光效为61cd/A，且OLED显示基板在预设视角下的色偏小于4.8JNCD。
  14. 根据权利要求1所述的OLED显示基板，其中，所述发光结构层包括依次设置的阳极、空穴注入层、发光层、电子传输层、阴极，所述光取出结构形成于所述阴极远离所述衬底基板的一侧。
  15. 根据权利要求14所述的OLED显示基板，其中，所述光取出结构远离所述阴极的一侧形成有封装层。
  16. 一种显示装置，其中，包括权利要求1-15任一项所述的OLED显示基板。
  17. 一种OLED显示基板的制作方法，用于制作权利要求1-15任一项所述的OLED显示基板，其中，OLED显示基板包括多个像素单元，每个所述像素单元包括多个子像素，OLED显示基板的制作方法包括以下步骤：
    提供一衬底基板；
    在所述衬底基板的一侧形成发光结构层；
    在所述发光结构层的出光侧形成光取出结构，所述光取出结构包括与多个子像素一一对应的多个光取出层，每个所述光取出层在所述衬底基板上的正投影覆盖对应的所述子像素，对应于相同颜色的子像素的所述光取出层的厚度相 同，且多个所述光取出层中，至少包括对应第一颜色的第一子像素的第一光取出层，所述第一光取出层的厚度与对应于其他颜色的子像素的所述光取出层的厚度不同。
  18. 根据权利要求17所述的OLED显示基板的制作方法，其中，
    所述光取出层包括第一光取出层、第二光取出层和第三光取出层，所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素；
    多个所述光取出层为单层结构；
    在所述发光结构层的出光侧形成光取出层，具体包括：
    采用掩膜板多次蒸镀依次形成所述第一光取出层、所述第二光取出层和所述第三光取出层。
  19. 根据权利要求17所述的OLED显示基板的制作方法，其中，
    所述光取出层包括第一光取出层、第二光取出层和第三光取出层，所述第一光取出层对应具有第一颜色的第一子像素，所述第二光取出层对应具有第二颜色的第二子像素，所述第三光取出层对应具有第三颜色的第三子像素；
    所述光取出层为双层结构，多个所述光取出层包括厚度相同的第一子光取出层和厚度不同的第二子光取出层；
    在所述发光结构层的出光侧形成光取出层，具体包括：
    形成多个所述光取出层中的所述第一子光取出层；
    在所述第一子光取出层的出光侧分别形成各所述光取出层的所述第二子光取出层。
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