WO2015085681A1 - Oled显示面板及其制作方法、显示装置、电子产品 - Google Patents

Oled显示面板及其制作方法、显示装置、电子产品 Download PDF

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Publication number
WO2015085681A1
WO2015085681A1 PCT/CN2014/074155 CN2014074155W WO2015085681A1 WO 2015085681 A1 WO2015085681 A1 WO 2015085681A1 CN 2014074155 W CN2014074155 W CN 2014074155W WO 2015085681 A1 WO2015085681 A1 WO 2015085681A1
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layer
pixel
sub
luminescent layer
covering
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PCT/CN2014/074155
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English (en)
French (fr)
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吴长晏
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京东方科技集团股份有限公司
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Priority to US14/405,293 priority Critical patent/US9608044B2/en
Publication of WO2015085681A1 publication Critical patent/WO2015085681A1/zh

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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30Devices specially adapted for multicolour light emission
    • H10K59/32Stacked devices having two or more layers, each emitting at different wavelengths
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • H10K50/13OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • H10K50/13OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
    • H10K50/131OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit with spacer layers between the electroluminescent layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/805Electrodes
    • H10K50/81Anodes
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/805Electrodes
    • H10K50/82Cathodes
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30Devices specially adapted for multicolour light emission
    • H10K59/35Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2101/00Properties of the organic materials covered by group H10K85/00
    • H10K2101/30Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2101/00Properties of the organic materials covered by group H10K85/00
    • H10K2101/40Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00Constructional details relating to the organic devices covered by this subclass
    • H10K2102/10Transparent electrodes, e.g. using graphene
    • H10K2102/101Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO]
    • H10K2102/103Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO] comprising indium oxides, e.g. ITO

Definitions

  • OLED display panel and manufacturing method thereof, display device, electronic product
  • An organic electroluminescence display device is a display device that emits light by electrically exciting a phosphor or a phosphor organic compound.
  • the OLED drives a plurality of organic light emitting diodes to display an image, and the organic light emitting diode includes an anode, an organic thin layer, and a cathode.
  • the organic thin layer usually has a multilayer structure including an electron-emitting layer (EML), an electron transport layer (ETL), and a hole transport layer (HTL) to improve the balance between electrons and holes, and to improve luminous efficiency.
  • the multilayer structure may further include an electron injection layer (EIL) and a hole injection layer (HIL).
  • the red (R), green (G), and blue (B) light-emitting layers can be patterned, respectively.
  • a 3 ⁇ 4 shadow mask can be used in the case of a small molecule OLED, and in the case of a polymer OLED, a 3 ⁇ 4 ink printing method or a laser induced thermal imaging (LITI) method can be used.
  • the organic layer can be finely patterned by the LITI method, and the LITI method can be used for a large area, and the LITI method has the advantage of high resolution.
  • the high PPI (Pixels per inch, number of pixels per inch) display device is the main trend of current display devices.
  • the existing OLED mass production technology mainly uses fine metal mask (FMM) and pixel juxtaposition.
  • FMM fine metal mask
  • the RGB side by side is used to realize the full color display of the OLED, but the precision control of the FMM is difficult, making the high PPI OLED difficult to implement.
  • the prior art mainly has the following two solutions:
  • two light-emitting layers of color sub-pixels such as 1 and 0, are simultaneously fabricated, and then one of the two sub-pixel light-emitting layers is used to extract one color by microcavity effect.
  • R or G when the light-emitting layer of the third color sub-pixel is fabricated, a light-emitting layer of a third color, such as B, may be formed in the entire pixel region.
  • a light-emitting layer of a third color such as B
  • the color shift is very serious as the viewing angle is changed, and the luminous efficiency of the two color light-emitting layers produced at the same time is lost.
  • the illuminating layer of the same color sub-pixel in different pixels is simultaneously evaporated by the FMM with a larger opening, but this method causes the sub-pixels to be arranged in an inconsistent order, resulting in discontinuous lines when the screen is displayed. Sawtooth image.
  • the technical problem to be solved by the present invention is to provide an OLED display panel, a manufacturing method thereof, a display device, and an electronic product, which can improve the pixel density of the OLED display panel without changing the accuracy of the FMM.
  • an OLED display panel wherein the pixels of the OLED display panel include a first sub-pixel, a second sub-pixel, and a third sub-pixel that display different colors, and the OLED display panel sequentially includes:
  • a first luminescent layer covering at least two adjacent sub-pixels including the first sub-pixel;
  • a charge blocking layer covering the second sub-pixel and the third sub-pixel;
  • a third luminescent layer covering at least two adjacent sub-pixels including the third sub-pixel; wherein, a main body material of the charge blocking layer, a main illuminant material of the third luminescent layer, the first The lowest unequal orbital LUMO energy level of the main illuminant material of the second luminescent layer and the main illuminant material of the first luminescent layer is sequentially decreased; or the main illuminant material of the first luminescent layer, the first:::: :::: The highest occluded orbital HOMO level of the main illuminant material of the luminescent layer and the main illuminant material of the third luminescent layer and the bulk material of the charge blocking layer are sequentially reduced.
  • the OLED display panel includes in turn;
  • the OLED display panel includes:
  • the OLED display surface includes:
  • the OLED display panel includes:
  • the OLED display panel specifically includes:
  • the first luminescent layer on the hole transport layer is the first luminescent layer on the hole transport layer
  • the charge blocking layer on the first luminescent layer is the charge blocking layer on the first luminescent layer
  • the second luminescent layer on the charge blocking layer is the second luminescent layer on the charge blocking layer
  • the third luminescent layer on the second luminescent layer is the third luminescent layer on the second luminescent layer
  • the OLED display panel specifically includes:
  • the third luminescent layer The second luminescent layer on the third luminescent layer;
  • the charge blocking layer on the second luminescent layer is the charge blocking layer on the second luminescent layer
  • the first luminescent layer on the charge blocking layer is the first luminescent layer on the charge blocking layer
  • An electron transport layer on the first light emitting layer is an electron transport layer on the first light emitting layer
  • Embodiments of the present invention also provide a display device including the OLED display panel as described above.
  • the embodiment of the present invention further provides a method for fabricating an OLED display panel, wherein the pixels of the OLED display panel include a first sub-pixel, a second sub-pixel, and a third sub-pixel that display different colors, and the manufacturing method includes:
  • a third luminescent layer covering at least two adjacent sub-pixels including the third sub-pixel; wherein, a host material of the charge blocking layer, a main illuminant material of the third luminescent layer, the The lowest illuminant LUMO energy level of the main illuminant material of the second luminescent layer and the main illuminant material of the first luminescent layer is sequentially decreased; or the main illuminant material of the first luminescent layer, the second illuminating The highest occupied orbital HOMO level of the primary illuminant material of the layer and the main illuminant material of the third luminescent layer and the host material of the charge blocking layer are sequentially reduced.
  • the manufacturing method specifically includes:
  • a metal cathode layer on the electron transport layer is formed.
  • the manufacturing method specifically includes:
  • Forming a semi-transparent anode layer Forming a hole transport layer on the semi-transmissive anode layer;
  • a metal cathode layer on the electron transport layer is formed.
  • Embodiments of the present invention also provide an electronic product including the display device as described above.
  • the first luminescent layer, the charge blocking layer, the second luminescent layer, and the third luminescent layer each cover at least two sub-pixels, such that when the luminescent layer is fabricated by using the FMM, the minimum opening of the FMM may have at least two sub-pixel regions Therefore, the pixel density of the OLED display panel can be improved without changing the FMM.
  • the OLED display panel of the embodiment of the present invention does not rely on the optical effect to take out a certain color, so that the luminous efficiency is not lost, and the color shift problem does not occur.
  • the OLED display panel of the embodiment of the present invention also does not need to change the sub-pixel. The order of the arrangement, and will not affect the screen display.
  • FIG. 1 is a schematic structural view of an OLED display panel in the prior art
  • FIG. 2 is a schematic diagram of fabricating a light-emitting layer using a larger opening FMM in the prior art
  • FIG. 3 is a schematic diagram showing the size of LUMO levels of each of the light-emitting layer and the charge blocking layer according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic structural diagram of an OLED display panel according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram showing the sizes of HOMO levels of each of the light-emitting layer and the charge blocking layer according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of an OLED display panel according to Embodiment 2 of the present invention.
  • the embodiment of the invention provides an OLED display panel, a display device thereof, and an electronic product, which can improve the pixel density of the OLED display panel under the condition that the FMM precision is unchanged.
  • the embodiment of the invention provides an OLED display panel.
  • the pixel of the OLED display panel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel that display different colors, wherein the OLED display panel includes:
  • a first luminescent layer covering at least two adjacent sub-pixels including the first sub-pixel;
  • a charge blocking layer covering the second sub-pixel and the third sub-pixel;
  • a third luminescent layer covering at least two adjacent sub-pixels including the third sub-pixel; wherein, a main body material of the charge blocking layer, a main illuminant material of the third luminescent layer, the first The main illuminant material of the two luminescent layer and the LUMO ( Lowest Unoccupied Molecular Orbital) of the main illuminant material of the first luminescent layer (note; the trajectory with the lowest energy level of the non-occupied electron is called the minimum The energy level is sequentially decreased; or the main illuminant material of the first luminescent layer, the main illuminant material of the second luminescent layer, and the main illuminant material of the third luminescent layer and the charge blocking layer
  • the HOMO Highest Occupied Molecular Orbital, the highest occupied orbit
  • the host material note: the orbit with the highest energy level of the electrons is referred to as the highest occupied orbit.
  • the first luminescent layer, the charge blocking layer, the second luminescent layer, and the third luminescent layer each cover at least two sub-pixels, so that when the luminescent layer is fabricated by using the FMM, the minimum opening of the FMM can be At least two sub-pixel areas are large, so that the pixel density of the OLED display panel can be improved without changing the FMM.
  • the OLED display panel of the embodiment of the present invention does not rely on the optical effect to take out a certain light color, and does not lose the luminous efficiency, and the color shift problem does not occur.
  • the OLED display panel of the embodiment of the present invention also does not need to change the sub-pixel. The order is not affected by the screen display.
  • the OLED display panel may include: the first illuminating layer covering the entire pixel;
  • the third luminescent layer covering the entire pixel.
  • the OLED display panel may include: a first illuminating layer covering the entire pixel;
  • the OLED display panel may include: the first illuminating layer covering the first sub-pixel and the second sub-pixel;
  • the OLED display panel may include: the first illuminating layer covering the first sub-pixel and the second sub-pixel;
  • the third luminescent layer covering the entire pixel.
  • the OLED display panel may specifically include: a semi-transparent anode layer;
  • the first luminescent layer on the hole transport layer is the first luminescent layer on the hole transport layer
  • the charge blocking layer on the first luminescent layer is the charge blocking layer on the first luminescent layer
  • the second luminescent layer on the charge blocking layer is the second luminescent layer on the charge blocking layer
  • the third luminescent layer on the second luminescent layer is the third luminescent layer on the second luminescent layer
  • the OLED display panel may specifically include: a semi-transparent anode layer;
  • the second luminescent layer on the third luminescent layer is the second luminescent layer on the third luminescent layer
  • the charge blocking layer on the second luminescent layer is the charge blocking layer on the second luminescent layer
  • the first luminescent layer on the charge blocking layer is the first luminescent layer on the charge blocking layer
  • An electron transport layer on the first light emitting layer is an electron transport layer on the first light emitting layer
  • the cathode layer is made of metal.
  • the embodiment of the present invention is not limited thereto, and those skilled in the art should also understand that the anode layer can also be made of metal.
  • the cathode layer was made of ITO.
  • the case where the anodes are respectively provided for the three sub-pixels and the three sub-pixels share one cathode will be described as an example; however, those skilled in the art should understand that, instead, the three sub-pixels may be shared.
  • the anodes and the three sub-pixels each use a respective cathode.
  • Embodiments of the present invention also provide a display device including the OLED display panel as described above.
  • the structure and working principle of the OLED display panel are the same as those in the foregoing embodiment, and details are not described herein again.
  • the structure of other parts of the display device can refer to the prior art, and will not be described in detail herein.
  • the display device can be: electronic paper, television, display, digital photo frame, mobile phone, tablet, etc. Products or components having any display function.
  • the embodiment of the present invention further provides a method for fabricating an OLED display panel, wherein the pixels of the OLED display panel include a first sub-pixel, a second sub-pixel, and a third sub-pixel that display different colors, wherein the manufacturing method Includes:
  • a third luminescent layer covering at least two adjacent sub-pixels including the third sub-pixel; wherein, a host material of the charge blocking layer, a main illuminant material of the third luminescent layer, the The LUMO energy level of the main illuminant of the second luminescent layer and the main illuminant material of the first luminescent layer is sequentially decreased; or the main illuminant material of the first luminescent layer, and the main illuminating layer An illuminant material and a main illuminant material of the third luminescent layer and a host material of the charge blocking layer The HOMO energy level is reduced in turn.
  • the first luminescent layer, the charge blocking layer, the second luminescent layer and the third luminescent layer each cover at least two sub-pixels, so that when the luminescent layer is fabricated by using the FMM, the minimum opening of the FMM can be at least two.
  • the sub-pixel area is large, so that the pixel density of the OLED display panel can be improved without changing the FMM.
  • the OLED display panel of the embodiment of the present invention does not rely on the optical effect to take out a certain color, so that the luminous efficiency is not lost, and the color shift problem does not occur.
  • the OLED display panel of the embodiment of the present invention also does not need to change the sub-pixel. The order of the arrangement, and will not affect the screen display.
  • the manufacturing method may specifically include: forming a semi-transmissive anode layer;
  • a metal cathode layer on the electron transport layer is formed.
  • the manufacturing method may specifically include: forming a semi-transmissive anode layer;
  • a metal cathode layer on the electron transport layer is formed.
  • Another aspect of the present invention provides, in another aspect, an electronic product comprising the display device as described above.
  • the structure and working principle of the electronic product are the same as those in the foregoing embodiment, and are not described herein again.
  • the structure of other parts of the electronic product can refer to the prior art, No longer described in detail.
  • the electronic product can be: a product or a component having any display function such as a home appliance, a communication device, an engineering device, an electronic entertainment product, or the like.
  • the pixels of the OLED display panel include a first sub-pixel displaying red, a second sub-pixel displaying green, and a third sub-pixel displaying blue, wherein the OLED display panel includes :
  • EML1 red light-emitting first light-emitting layer
  • charge ffi barrier layer covering the second sub-pixel and the third sub-pixel (: charge blocking layer, CBL);
  • EML2 second luminescent layer
  • EML3 blue light
  • FIG. 3 is a schematic diagram showing the sizes of LUMO levels of the light-emitting layers and the charge blocking layer according to the first embodiment of the present invention.
  • the direction of the arrow in Fig. 3 indicates the absolute value of the energy level.
  • the LUMO energy level of the first light emitting layer, the LUMO energy level of the second light emitting layer, the LUMO energy level of the third light emitting layer, and the LUMO energy level of the charge blocking layer are all negative, and the LUMO energy level of the first light emitting layer is smaller than
  • the LUMO energy level of the second light-emitting layer, the LUMO energy level of the second light-emitting layer is smaller than the LUMO energy level of the third light-emitting layer, and the LUMO energy level of the third light-emitting layer is smaller than the LUMO energy level of the charge-blocking layer.
  • the OLED display panel may include;
  • An electron transport layer on the third light emitting layer A metal cathode layer on the electron transport layer.
  • the method for fabricating an OLED display panel of the embodiment of the present invention includes the following steps: forming a semi-transmissive anode layer;
  • a metal cathode layer on the electron transport layer is formed.
  • the light-emitting layer is thin, electrons are more easily moved from the cathode layer toward the anode layer, and are not easily moved laterally in a direction perpendicular to the electric field, and electrons are easily emitted from a LUMO level. Transition to a lower LUMO level, but it is not easy to transition from a lower LUMO level to a higher LUMO level. When the electrons stay in a certain layer and the holes meet, they form an excitation. After the child shines. In accordance with the above principle, in the OLED display panel as shown in FIG.
  • the electron cluster cathode layer starts, because the LUMO energy level of the EML 2 is greater than the LUMO energy level of the EML 1, so that the electron can pass through EML2 reaches EML1, but cannot pass through HTL, electrons will stay in EMU to stimulate EML1 to emit red light, so that the first sub-pixel displays red light; for the second sub-pixel area, because EML3 has a LUMO energy level greater than EML2's LUMO The energy level, the LUMO level of the CBL is greater than the LUMO level of the EML2.
  • the first luminescent layer, the charge blocking layer, the second luminescent layer, and the third luminescent layer each cover at least two sub-pixels, so that the FMM is utilized.
  • the minimum opening of the FMM can be at least two sub-pixel areas, so that the pixel density of the OLED display panel can be doubled without changing the FMM.
  • the OLED display panel of the embodiment of the present invention does not rely on the optical effect to take out a certain color, and does not lose the luminous efficiency of the luminescent layer, and does not cause a color shift problem; the OLED display panel of the embodiment of the present invention also has no change.
  • the order in which the sub-pixels are arranged does not affect the display of the screen.
  • the OLED display panel of the embodiment of the present invention is not limited to the structure shown in FIG. 4, and the first luminescent layer may cover only the first sub-pixel and the second sub-pixel, except that the entire illuminating layer covers the entire pixel.
  • a third illuminating layer may cover the entire sub-pixel, but the second illuminating layer covers only the first sub-pixel and the second sub-pixel, the charge blocking layer Only the second sub-pixel and the third sub-pixel are covered.
  • the first sub-pixel is not limited to displaying red
  • the second sub-pixel is not limited to displaying green
  • the third sub-pixel is not limited to displaying blue as long as the first sub-pixel, the second sub-pixel, and the third sub-pixel are displayed.
  • the pixels of the OLED display panel include a first sub-pixel displaying red, a second sub-pixel displaying green, and a third sub-pixel displaying blue, wherein the OLED display panel includes . - covering at least two adjacent sub-pixels including the first sub-pixel to emit a red light-emitting first light-emitting layer (EML1);
  • EML1 red light-emitting first light-emitting layer
  • CBL charge blocking layer
  • EML2 second luminescent layer
  • EML3 blue light
  • FIG. 5 is a schematic diagram showing the size of the HOMO energy levels of each of the light-emitting layers and the charge blocking layer according to the embodiment of the present invention: ::::.
  • the direction of the arrow in Fig. 5 indicates the absolute value of the energy level.
  • the HOMO level of the first luminescent layer, the HOMO level of the second luminescent layer, the HOMO level of the third luminescent layer, and the HOMO level of the charge blocking layer are all negative, and the HOMO level of the first luminescent layer is greater than The HOMO level of the second luminescent layer, the HOMO level of the second luminescent layer is greater than the HOMO level of the third luminescent layer, and the HOMO level of the third luminescent layer is greater than the HOMO energy of the charge blocking layer Level.
  • the OLED display panel may include: a hole transport layer on the semi-transmissive anode layer;
  • the third luminescent layer on the hole transport layer is the third luminescent layer on the hole transport layer
  • the second luminescent layer on the third luminescent layer is the second luminescent layer on the third luminescent layer
  • the charge blocking layer on the second luminescent layer is the charge blocking layer on the second luminescent layer
  • the first luminescent layer on the charge blocking layer is the first luminescent layer on the charge blocking layer
  • An electron transport layer on the first light emitting layer is an electron transport layer on the first light emitting layer
  • the method for fabricating an OLED display panel of the embodiment of the present invention includes the following steps: forming a semi-transmissive anode layer;
  • a metal cathode layer on the electron transport layer is formed.
  • the light-emitting layer is thin, holes are more easily moved from the anode layer toward the cathode layer, and are not easily moved laterally in a direction perpendicular to the electric field, and holes are easily removed from the HOMO level.
  • the light-emitting layer transitions to a light-emitting layer with a higher HOMO level, but it is not easy to transition from a light-emitting layer having a higher HOMO level to a light-emitting layer having a lower HOMO level, and forming a hole when a certain light-emitting layer meets an electron. After the excitons, the light is emitted.
  • the OLED display panel as shown in FIG.
  • holes start from the anode layer because the HOMO level of the EML2 is smaller than the HOMO level of the EML1, so that holes can pass through the EML2.
  • EML1 but not through ETL, holes will stay in EML1 and EML1 emits red light, so that the first sub-pixel displays red light;
  • the HOMO level of EML3 is smaller than the HOMO energy of EML2 Level, the HOMO level of CBL is less than the HOMO level of EML2, therefore, The hole can pass through the EML3 to reach the EML2, but cannot pass through the CBL, the hole will stay in the EML2, and the EML2 emits green light, and the second sub-pixel displays green light.
  • the energy level is greater than the HOMO level of the CBL, and the holes cannot pass through the CBL, so the holes will stay in the EML3 to excite the EML3 to emit blue light, thereby causing the third sub-pixel to display blue light.
  • the first luminescent layer, the charge blocking layer, the second luminescent layer, and the third luminescent layer each cover at least two sub-pixels, so that when the luminescent layer is fabricated by using the FMM, the minimum opening of the FMM can be at least There are two sub-pixel areas that are large enough to double the pixel density of the OLED display panel without changing the FMM.
  • the OLED display panel of the embodiment of the present invention does not rely on the optical effect to take out a certain color, and does not lose the luminous efficiency of the luminescent layer, and does not cause a color shift problem; the OLED display panel of the embodiment of the present invention also has no change.
  • the order in which the sub-pixels are arranged does not affect the display of the screen.
  • the OLED display panel of the embodiment of the present invention is not limited to the structure shown in FIG. 6.
  • the first illuminating layer may cover only the first sub-pixel and the second sub-pixel except for covering the entire pixel.
  • a third illuminating layer may cover the entire sub-pixel, but the second illuminating layer covers only the first sub-pixel and the second sub-pixel, the charge blocking layer Only the second sub-pixel and the third sub-pixel are covered.
  • the first sub-pixel is not limited to displaying red
  • the second sub-pixel is not limited to displaying green
  • the third sub-pixel is not limited to displaying blue as long as the first sub-pixel, the second sub-pixel, and the third sub-pixel are displayed.
  • Different colors display one of red, green, and blue.

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Abstract

一种OLED显示面板及其制作方法、显示装置、电子产品,该OLED显示面板依次包括:覆盖包括第一子像素在内的至少两个相邻子像素的第一发光层;覆盖第二子像素和第三子像素的电荷阻挡层;覆盖第一子像素和第二子像素的第二发光层;以及覆盖包括第三子像素在内的至少两个相邻子像素的第三发光层;其中,电荷阻挡层的主体材料、第三发光层的主发光体材料、第二发光层的主发光体材料和第一发光层的主发光体材料的LUMO能级依次降低,或第一发光层的主发光体材料、第二发光层的主发光体材料和第三发光层的主发光体材料和电荷阻挡层的主体材料的HOMO能级依次降低。该技术方案能够提升OLED显示面板的像素密度。

Description

OLED显示面板及其制作方法、 显示装置、 电子产品
本申请主张在 2013 年 12 月 10 日在中国提交的中国专利申请号 No. 201310669698.1的优先权, 其全部内容通过引用包含于此。
Figure imgf000003_0001
显示装置、 电子 ≠r.口
有机电致发光显示器件(OLED)是一种利用电激发荧光体或磷光体有机 化合物来发光的显示器件。 OLED 驱动多个有机发光二极管来显示图像, 有 机发光二极管包括阳极、 有机薄层和阴极。 其中, 有机薄层通常具有包括发 光层 (EML)、 电子传输层 (ETL) 和空穴传输层 (HTL) 的多层结构, 以改 善电子和空穴之间的平衡, 丛而提高发光效率。 所述多层结构还可以包括电 子注入层 (EIL) 和空穴注入层 (HIL)。
在 OLED中,为了显示全色,可分别将红色(R)、绿色 (G)和蓝色 (B ) 发光层图案化。 为了将发光层图案化, 可在小分子 OLED的情况下使) ¾阴影 掩膜 (shadow mask) , 可在聚合物 OLED的情况下使 ¾啧墨打印法或激光诱 导热成像 (LITI) 法。 通过 LITI法可将有机层精细地图案化, 对于大面积可 使用 LITI法, 并且 LITI法的优势在于高分辨率。 高 PPI (Pixels per inch, 每 英寸所拥有的像素数目)显示器件为目前显示装置的主要趋势,现有的 OLED 量产技术主要是使用精细金属掩膜 (fine metal mask, FMM) 和像素并置法 (RGB side by side) 来实现 OLED的全彩化显示, 但是 FMM的精度控制困 难, 使得高 PPI的 OLED难以实现。 为了提高像素的密度, 现有技术主要存 在以下两种解决方案:
如图 1所示, 首先同时制作两个颜色子像素的发光层, 比如 1 和0, 然后再利用两个子像素发光层的不同光学厚度, 以微腔效应萃取出其中一色, 比如 R或 G , 之后在制作第三种颜色子像素的发光层时, 可以在整个像素区 域都形成第三种颜色的发光层, 比如 B。 但是此种方式制作的 OLED, 随着 视角的变换, 色偏情况非常严重, 而旦同时制作的两个颜色的发光层的发光 效率也会损失掉一部分。
2、 如图 2所示, 以一较大开口的 FMM同时蒸镀不同像素中相同颜色子 画素的发光层, 但是此种方式会造成子像素排列顺序不一致, 导致画面显示 时, 产生线条不连续的锯齿图像。
本发明要解决的技术问题是提供一种 OLED显示面板及其制作方法、 显 示装置、 电子产品, 使得能够在 FMM精度不变的情况下, 提升 OLED显示 面板的像素密度。
为解决上述技术问题, 本发明实施例提供技术方案如下;
一方面, 提供一种 OLED显示面板, 所述 OLED显示面板的像素包括有 显示不同颜色的第一子像素、 第二子像素和第三子像素, 所述 OLED显示面 板依次包括:
覆盖包括所述第一子像素在内的至少两个相邻子像素的第一发光层; 覆盖所述第二子像素和所述第三子像素的电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的第二发光层;
覆盖包括所述第三子像素在内的至少两个相邻子像素的第三发光层; 其中, 所述电荷阻挡层的主体材料、 所述第三发光层的主发光体材料、 所述第二发光层的主发光体材料和所述第一发光层的主发光体材料的最低未 占轨道 LUMO能级依次降低; 或所述第一发光层的主发光体材料、所述第::::: 发光层的主发光体材料和所述第三发光层的主发光体材料和所述电荷阻挡层 的主体村料的最高已占轨道 HOMO能级依次降低。
进一步地, 所述 OLED显示面板依次包括;
覆盖整个像素的所述第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的所述第二发光层; 覆盖整个像素的所述第三发光层。
进一步地, 所述 OLED显示面板依次包括:
覆盖整个像素的第一发光层;
覆盖所述第二子像素和所述第三 素的所述电荷阻挡层; 覆盖所述第一子像素和所述第二 素的所述第二发光层; 覆盖所述第二子像素和所述第三 素的所述第三发光层。 进一步地, 所述 OLED显示面 :包括:
覆盖所述第一子像素和所述; 像素的所述第一发光层; 覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层; 覆盖所述第一子像素和所述第二子像素的所述第二发光层; 覆盖所述第二子像素和所述第三子像素的所述第三发光层。 进一步地, 所述 OLED显示面板依次包括:
覆盖所述第一子像素和所述第二子像素的所述第一发光层; 覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层; 覆盖所述第一子像素和所述第二子像素的所述第二发光层;
进一歩地, 所述 OLED显示面板具体包括:
半透光阳极层;
所述半透光阳极层上的空穴传输层;
所述空穴传输层上的所述第一发光层;
所述第一发光层上的所述电荷阻挡层;
所述电荷阻挡层上的所述第二发光层;
所述第二发光层上的所述第三发光层;
所述第三发光层上的电子传输层;
所述电子传输层上的金属阴极层。
进一步地, 所述 OLED显示面板具体包括;
半透光阳极层;
所述半透光阳极层上的空穴传输层;
的所述第三发光层; 所述第三发光层上的所述第二发光层;
所述第二发光层上的所述电荷阻挡层;
所述电荷阻挡层上的所述第一发光层;
所述第一发光层上的电子传输层;
所述电子传输层上的金属阴极层。
本发明实施例还提供了一种显示装置,包括如上所述的 OLED显示面板。 本发明实施例还提供了一种 OLED显示面板的制作方法, 所述 OLED显 示面板的像素包括有显示不同颜色的第一子像素、第二子像素和第三子像素, 所述制作方法包括:
形成覆盖包括所述第一子像素在内的至少两个相邻子像素的第一发光层; 形成覆盖所述第二子像素和所述第三子像素的电荷阻挡层;
形成覆盖所述第一子像素和所述第二子像素的第二发光层;
形成覆盖包括所述第三子像素在内的至少两个相邻子像素的第三发光层; 其中, 所述电荷阻挡层的主体材料、 所述第三发光层的主发光体材料、 所述第二发光层的主发光体材料和所述第一发光层的主发光体材料的最低未 占轨道 LUMO能级依次降低; 或所述第一发光层的主发光体材料、 所述第二 发光层的主发光体材料和所述第三发光层的主发光体材料和所述电荷阻挡层 的主体材料的最高已占轨道 HOMO能级依次降低。
进一歩地, 所述制作方法具体包括:
形成半透光阳极层;
形成所述半透光阳极层上的空穴传输层;
形成所述空穴传输层上的所述第一发光层;
形成所述第一发光层上的所述电荷阻挡层;
形成所述电荷阻挡层上的所述第二发光层;
形成所述第二发光层上的所述第三发光层;
形成所述第三发光层上的电子传输层;
形成所述电子传输层上的金属阴极层。
进一步地, 所述制作方法具体包括:
形成半透光阳极层; 形成所述半透光阳极层上的空穴传输层;
形成所述空穴传输层上的所述第三发光层;
形成所述第三发光层上的所述第二发光层;
形成所述第二发光层上的所述电荷阻挡层;
形成所述电荷阻挡层上的所述第一发光层;
形成所述第一发光层上的电子传输层;
形成所述电子传输层上的金属阴极层。
本发明实施例还提供了一种电子产品, 包括如上所述的显示装置。
本发明实施例具有以下有益效果:
上述方案中, 第一发光层、 电荷阻挡层、 第二发光层和第三发光层均覆 盖至少两个子像素, 这样在利用 FMM制作发光层时, FMM的最小开口可以 至少有两个子像素区域大, 从而能够在不改变 FMM的前提下, 提升 OLED 显示面板的像素密度。 另外, 本发明实施例的 OLED显示面板不依靠光学效 应将某一光色取出, 因此不会损失发光效率, 也不会出现色偏问题; 本发明 实施例的 OLED显示面板也没用改变子像素的排列顺序, 并且不会对画面显 示造成影响。
图 1为现有技术中的 OLED显示面板的结构示意图;
图 2为现有技术中的利用较大开口 FMM制作发光层的示意图; 图 3为本发明实施例一的各发光层以及电荷阻挡层的 LUMO能级的大小 示意图;
图 4为本发明实施例一的 OLED显示面板的结构示意图;
图 5为本发明实施例二的各发光层以及电荷阻挡层的 HOMO能级的大小 示意图;
图 6为本发明实施例二的 OLED显示面板的结构示意图。
为使本发明实施例要解决的技术问题、 技术方案和优点更加清楚, 下面 将结合 f†图及具体实施例进行详细描述。
本发明实施例提供一种 OLED显示面板及其制作方法、 显示装置、 电子 产品, 使得能够在 FMM精度不变的情况下, 提升 OLED显示面板的像素密 本发明实施例提供了一种 OLED显示面板, 所述 OLED显示面板的像素 包括有显示不同颜色的第一子像素、 第二子像素和第三子像素, 其中, 所述 OLED显示面板依次包括:
覆盖包括所述第一子像素在内的至少两个相邻子像素的第一发光层; 覆盖所述第二子像素和所述第三子像素的电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的第二发光层;
覆盖包括所述第三子像素在内的至少两个相邻子像素的第三发光层; 其中, 所述电荷阻挡层的主体材料、 所述第三发光层的主发光体材料、 所述第二发光层的主发光体材料和所述第一发光层的主发光体材料的 LUMO ( Lowest Unoccupied Molecular Orbital, 最低未占轨道 ) (注; 将未占有电子 的能级最低的轨道称为最低未占轨道) 能级依次降低; 或者所述第一发光层 的主发光体材料、 所述第二发光层的主发光体材料和所述第三发光层的主发 光体材料和所述电荷阻挡层的主体材料的 HOMO ( Highest Occupied Molecular Orbital, 最高已占轨道)(注: 将已占有电子的能级最高的轨道称为 最高已占轨道) 能级依次降低。
在本发明实施例的 OLED显示面板中, 第一发光层、 电荷阻挡层、 第二 发光层和第三发光层均覆盖至少两个子像素, 这样在利用 FMM制作发光层 时, FMM的最小开口可以至少有两个子像素区域大,从而能够在不改变 FMM 的前提下, 提升 OLED显示面板的像素密度。 另外, 本发明实施例的 OLED 显示面板不依靠光学效应将某一光色取出, 不会损失发光效率, 也不会出现 色偏问题; 本发明实施例的 OLED显示面板也没用改变子像素的排列顺序, 不会对画面显示造成影响。
具体地, 本发明一实施例中, 所述 OLED显示面板可以依次包括: 覆盖整个像素的所述第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层; 覆盖所述第一子像素和所述第二子像素的所述第二发光层;
覆盖整个像素的所述第三发光层。
具体地, 本发明一实施例中, 所述 OLED显示面板可以依次包括: 覆盖整个像素的第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的所述第二发光层;
覆盖所述第二子像素和所述第三子像素的所述第三发光层。
具体地, 本发明一实施例中, 所述 OLED显示面板可以依次包括: 覆盖所述第一子像素和所述第二子像素的所述第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的所述第二发光层;
覆盖所述第二子像素和所述第三子像素的所述第三发光层。
具体地, 本发明一实施例中, 所述 OLED显示面板可以依次包括: 覆盖所述第一子像素和所述第二子像素的所述第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的所述第二发光层;
覆盖整个像素的所述第三发光层。
进一步地, 本发明一实施例中, 所述 OLED显示面板具体可以包括: 半透光阳极层;
所述半透光阳极层上的空穴传输层;
所述空穴传输层上的所述第一发光层;
所述第一发光层上的所述电荷阻挡层;
所述电荷阻挡层上的所述第二发光层;
所述第二发光层上的所述第三发光层;
所述第三发光层上的电子传输层;
所述电子传输层上的金属阴极层。
进一步地, 本发明一实施例中, 所述 OLED显示面板具体可以包括: 半透光阳极层;
所述半透光阳极层上的空穴传输层; 所述空穴传输层上的所述第三发光层;
所述第三发光层上的所述第二发光层;
所述第二发光层上的所述电荷阻挡层;
所述电荷阻挡层上的所述第一发光层;
所述第一发光层上的电子传输层;
所述电子传输层上的金属阴极层。
需要注意的是, 尽管上述优选实施例中将阳极层设置为用半透光的 料
(例如, 顿锡氧化物 (ΠΌ) ) 制作, 而将阴极层用金属制作, 然而, 本发明 实施例并不限于此, 并旦本领域的技术人员也应当明白, 也可以用金属制作 阳极层而用 ITO制作阴极层。 此外, 下述实施例中以对三个子像素分别设置 阳极而使这三个子像素共用一个阴极的情况为例进行说明; 然而本领域的技 术人员应当明白, 作为替代, 也可以使三个子像素共用阳极而这三个子像素 分别使用各自的阴极。
本发明实施例还提供了一种显示装置,包括如上所述的 OLED显示面板。 其中, OLED 显示面板的结构以及工作原理同上述实施例, 在此不再贅述。 另外,显示装置其他部分的结构可以参考现有技术,对此本文不再详细描述。 该显示装置可以为: 电子纸、 电视、 显示器、 数码相框、 手机、 平板电脑等 具有任何显示功能的产品或部件。
本发明实施例还提供了一种 OLED显示面板的制作方法, 所述 OLED显 示面板的像素包括有显示不同颜色的第一子像素、第二子像素和第三子像素, 其中, 所述制作方法包括:
形成覆盖包括所述第一子像素在内的至少两个相邻子像素的第一发光层; 形成覆盖所述第二子像素和所述第三子像素的电荷阻挡层;
形成覆盖所述第一子像素和所述第二子像素的第二发光层;
形成覆盖包括所述第三子像素在内的至少两个相邻子像素的第三发光层; 其中, 所述电荷阻挡层的主体材料、 所述第三发光层的主发光体材料、 所述第二发光层的主发光体 ^料和所述第一发光层的主发光体材料的 LUMO 能级依次降低; 或所述第一发光层的主发光体材料、 所述第二发光层的主发 光体材料和所述第三发光层的主发光体材料和所述电荷阻挡层的主体材料的 HOMO能级依次降低。
本发明制作的 OLED显示面板, 第一发光层、 电荷阻挡层、 第二发光层 和第三发光层均覆盖至少两个子像素,这样在利用 FMM制作发光层时, FMM 的最小开口可以至少有两个子像素区域大, 从而能够在不改变 FMM 的前提 下, 提升 OLED显示面板的像素密度。 另外, 本发明实施例的 OLED显示面 板不依靠光学效应将某一光色取出, 因此不会损失发光效率, 也不会出现色 偏问题; 本发明实施例的 OLED显示面板也没用改变子像素的排列顺序, 并 且不会对画面显示造成影响。
进一步地, 本发明的一实施例中, 所述制作方法具体可以包括: 形成半透光阳极层;
形成所述半透光阳极层上的空穴传输层;
形成所述空穴传输层上的所述第一发光层;
形成所述第一发光层上的所述电荷阻挡层;
形成所述电荷阻挡层上的所述第二发光层;
形成所述第二发光层上的所述第三发光层;
形成所述第三发光层上的电子传输层;
形成所述电子传输层上的金属阴极层。
进一步地, 本发明的一实施例中, 所述制作方法具体可以包括: 形成半透光阳极层;
形成所述半透光阳极层上的空穴传输层;
形成所述空穴传输层上的所述第三发光层;
形成所述第三发光层上的所述第二发光层;
形成所述第二发光层上的所述电荷阻挡层;
形成所述电荷阻挡层上的所述第一发光层;
形成所述第一发光层上的电子传输层;
形成所述电子传输层上的金属阴极层。
本发明具体实施例另一方面还提供一种电子产品, 所述电子产品包括如 上所述的显示装置。 其中, 电子产品的结构以及工作原理同上述实施例, 在 此不再赘述。 另外, 电子产品其他部分的结构可以参考现有技术, 对此本文 不再详细描述。 该电子产品可以为: 家用电器、 通信设备、 工程设备、 电子 娱乐产品等具有任何显示功能的产品或部件。
下面结合具体的实施例对本发明的 OLED显示面板及其制作方法进行详 细介 :
Figure imgf000012_0001
在本发明实施例的 OLED显示面板中, OLED显示面板的像素包括有显 示红色的第一子像素、 显示绿色的第二子像素和显示蓝色的第三子像素, 其 中, OLED显示面板依次包括:
覆盖包括第一子像素在内的至少两个相邻子像素、 ^以发出红光的第一 发光层 (EML1 );
覆盖第二子像素和第三子像素的电荷 ffi挡层 (: charge blocking layer, CBL);
覆盖第一子像素和第二子像素、 以发出绿光的第二发光层 (EML2 ); 覆盖包括第三子像素在内的至少两个相邻子像素、 以发出蓝光的第三 发光层 (EML3 );
其中, 图 3所示为本发明实施例一的各发光层以及电荷阻挡层的 LUMO 能级的大小示意图。 其中, 图 3中的箭头方向表示能级的绝对值。 具体地, 第一发光层的 LUMO能级、第二发光层的 LUMO能级、第三发光层的 LUMO 能级和电荷阻挡层的 LUMO能级均为负数, 第一发光层的 LUMO能级小于 第二发光层的 LUMO 能级, 第二发光层的 LUMO 能级小于第三发光层的 LUMO能级, 第三发光层的 LUMO能级小于电荷阻挡层的 LUMO能级。
具体地, 如图 4所示, OLED显示面板可以包括;
半透光阳极层;
半透光阳极层上的空穴传输层;
覆盖整个像素的第一发光层;
覆盖第二子像素和第三子像素的电荷阻挡层;
覆盖第一子像素和第二子像素的第二发光层;
覆盖第二子像素和第三子像素的第三发光层;
第三发光层上的电子传输层; 电子传输层上的金属阴极层。
具体地, 本发明实施例的 OLED显示面板的制作方法包括以下步骤: 形成半透光阳极层;
形成所述半透光阳极层上的空穴传输层;
形成所述空穴传输层上的所述第一发光层;
形成所述第一发光层上的所述电荷阻挡层;
形成所述电荷阻挡层上的所述第二发光层;
形成所述第二发光层上的所述第三发光层;
形成所述第三发光层上的电子传输层;
形成所述电子传输层上的金属阴极层。
在 OLED显示面板中, 由于发光层很薄, 电子更容易由阴极层向阳极层 的方向移动, 而不容易沿着垂直于电场的方向横向移动, 并且电子容易从 LUMO 能级较高的发光层跃迁到 LUMO 能级较低的发光层, 但不容易从 LUMO能级较低的发光层跃迁到 LUMO能级较高的发光层,当电子停留在某 一发光层与空穴相遇后, 形成激发子后放光。 顺应上述原理, 在如图 4所示 的 OLED显示面板中, 对于第一子像素区域来说, 电子丛阴极层出发, 因为 EML2的 LUMO能级大于 EML1的 LUMO能级, 因此, 电子能够穿过 EML2 到达 EML1 , 但不能穿过 HTL, 电子将停留在 EMU激发 EML1发出红光, 从而使第一子像素显示红光;对于第二子像素区域来说,因为 EML3的 LUMO 能级大于 EML2的 LUMO能级, CBL的 LUMO能级大于 EML2的 LUMO 能级, 因此, 电子能够穿过 EML3到达 EML2, 但不能穿过 CBL, 电子将停 留在 EML2激发 EML2发出绿光, 从而使第二子像素显示绿光; 对于第三子 像素区域来说, 因为 EML3的 LUMO能级小于 CBL的 LUMO能级, 因此, 电子不能穿过 CBL, 电子将停留在 EML3激发 EML3发出蓝光, 从而使第三 子像素显示蓝光。
现有技术在利用 FMM制作 OLED显示面板时, 一般一个 FMM开口对 应一个子像素区域, 于 FMM的精度有限, 因此 OLED显示面板的像素密 度也受到了限制。 本发明实施例的 OLED显示面板中, 第一发光层、 电荷阻 挡层、 第二发光层和第三发光层均覆盖至少两个子像素, 这样在利用 FMM 制作发光层时, FMM的最小开口可以至少有两个子像素区域大, 从而能够在 不改变 FMM的前提下, 将 OLED显示面板的像素密度提升两倍。 另外, 本 发明实施例的 OLED显示面板不依靠光学效应将某一光色取出, 不会损失发 光层的发光效率, 也不会出现色偏问题; 本发明实施例的 OLED显示面板也 没用改变子像素的排列顺序, 不会对画面显示造成影响。
进一步地, 本发明实施例的 OLED显示面板并不局限于如图 4所示的结 构, 第一发光层除覆盖整个像素之外, 第一发光层还可以仅覆盖第一子像素 和第二子像素; 第三发光层除覆盖第二子像素和第三子像素之外, 第三发光 层还可以覆盖整个像素, 但是第二发光层仅覆盖第一子像素和第二子像素, 电荷阻挡层仅覆盖第二子像素和第三子像素。 第一子像素也不局限于显示红 色, 第二子像素也不局限于显示绿色, 第三子像素也不局限于显示蓝色, 只 要第一子像素、 第二子像素和第三子像素显示不同的颜色 ϋ分别显示红色、 绿色和蓝色中的其中一种颜色即可。 在本发明实施例的 OLED显示面板中, OLED显示面板的像素包括有显 示红色的第一子像素、 显示绿色的第二子像素和显示蓝色的第三子像素, 其 中, OLED显示面板依次包括。- 覆盖包括第一子像素在内的至少两个相邻子像素、 以发出红光的第一 发光层 (EML1 );
覆盖第二子像素和第三子像素的电荷阻挡层 (CBL);
覆盖第一子像素和第二子像素、 以发出绿光的第二发光层 (EML2 ); 覆盖包括第三子像素在内的至少两个相邻子像素、 以发出蓝光的第三 发光层 (EML3 );
其中, 如图 5 所示为本发明实施例:::::的各发光层以及电荷阻挡层的 HOMO能级的大小示意图。 其中, 图 5中的箭头方向表示能级的绝对值。 具 体地, 第一发光层的 HOMO能级、 第二发光层的 HOMO能级、 第三发光层 的 HOMO能级和电荷阻挡层的 HOMO能级均为负数,第一发光层的 HOMO 能级大于第二发光层的 HOMO能级, 第二发光层的 HOMO能级大于第三发 光层的 HOMO能级,第三发光层的 HOMO能级大于电荷阻挡层的 HOMO能 级。
具体地, 如图 6所示, OLED显示面板可以包括: 所述半透光阳极层上的空穴传输层;
所述空穴传输层上的所述第三发光层;
所述第三发光层上的所述第二发光层;
所述第二发光层上的所述电荷阻挡层;
所述电荷阻挡层上的所述第一发光层;
所述第一发光层上的电子传输层;
所述电子传输层上的金属阴极层。
具体地, 本发明实施例的 OLED显示面板的制作方法包括以下步骤: 形成半透光阳极层;
形成所述半透光阳极层上的空穴传输层;
形成所述空穴传输层上的所述第三发光层;
形成所述第三发光层上的所述第二发光层;
形成所述第二发光层上的所述电荷阻挡层;
形成所述电荷阻挡层上的所述第一发光层;
形成所述第一发光层上的电子传输层;
形成所述电子传输层上的金属阴极层。
在 OLED显示面板中, 由于发光层很薄, 空穴更容易由阳极层向阴极层 的方向移动, 而不容易沿着垂直于电场的方向横向移动, 并且空穴容易从 HOMO 能级较低的发光层跃迁到 HOMO 能级较高的发光层, 但不容易从 HOMO能级较高的发光层跃迁到 HOMO能级较低的发光层, 当空穴停留在 某一发光层与电子相遇后, 形成激发子后放光。 在如图 6所示的 OLED显示 面板中,对于第一子像素区域来说,空穴从阳极层出发,因为 EML2的 HOMO 能级小于 EMLl的 HOMO能级, 因此, 空穴能够穿过 EML2到达 EML1 , 但 不能穿过 ETL, 空穴将停留在 EML1激发 EML1发出红光, 从而使第一子像 素显示红光;对于第二子像素区域来说,因为 EML3的 HOMO能级小于 EML2 的 HOMO能级, CBL的 HOMO能级小于 EML2的 HOMO能级, 因此, 空 穴能够穿过 EML3到达 EML2, 但不能穿过 CBL, 空穴将停留在 EML2激发 EML2 发出绿光, 丛而使第二子像素显示绿光; 对于第三子像素区域来说, 因为 EML3的 HOMO能级大于 CBL的 HOMO能级, 空穴不能穿过 CBL, 因此空穴将停留在 EML3激发 EML3发出蓝光,从而使第三子像素显示蓝光。
现有技术在利用 FMM制作 OLED显示面板时, 一般一个 FMM开口对 应一个子像素区域, 由于 FMM的精度有限, 因此 OLED显示面板的像素密 度也受到了限制。 本发明实施例的 OLED显示面板中, 第一发光层、 电荷阻 挡层、 第二发光层和第三发光层均覆盖至少两个子像素, 这样在利用 FMM 制作发光层时, FMM的最小开口可以至少有两个子像素区域大, 从而能够在 不改变 FMM的前提下, 将 OLED显示面板的像素密度提升两倍。 另外, 本 发明实施例的 OLED显示面板不依靠光学效应将某一光色取出, 不会损失发 光层的发光效率, 也不会出现色偏问题; 本发明实施例的 OLED显示面板也 没用改变子像素的排列顺序, 不会对画面显示造成影响。
进一步地, 本发明实施例的 OLED显示面板并不局限于如图 6所示的结 构, 第一发光层除覆盖整个像素之外, 第一发光层还可以仅覆盖第一子像素 和第二子像素; 第三发光层除覆盖第二子像素和第三子像素之外, 第三发光 层还可以覆盖整个像素, 但是第二发光层仅覆盖第一子像素和第二子像素, 电荷阻挡层仅覆盖第二子像素和第三子像素。 第一子像素也不局限于显示红 色, 第二子像素也不局限于显示绿色, 第三子像素也不局限于显示蓝色, 只 要第一子像素、 第二子像素和第三子像素显示不同的颜色 分别显示红色、 绿色和蓝色中的其中一种颜色即可。
以上所述是本发明的优选实施方式, 应当指出, 对于本技术领域的普通 技术人员来说, 在不脱离本发明所述原理的前提下, 还可以作出若千改进和 润饰, 这些改进和润饰也应视为本发明的保护范围。

Claims

1 . 一种 OLED显示面板, 所述 OLED显示面板的像素包括有分别显示 不同颜色的第一子像素、 第二子像素和第三子像素, 其中, 所述 OLED显示 面板依次包括:
覆盖包括所述第一子像素在内的至少两个相邻子像素的第一发光层; 覆盖所述第二子像素和所述第三子像素的电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的第二发光层;
覆盖包括所述第三子像素在内的至少两个相邻子像素的第三发光层; 其中, 所述电荷阻挡层的主体材料的最低未占轨道 LIJMO能级、所述第 三发光层的主发光体材料的最低未占轨道 LUMO能级、所述第二发光层的主 发光体 料的最低未占轨道 LUMO能级和所述第一发光层的主发光体材料的 最低未占轨道 LUMO能级依次降低;或所述第一发光层的主发光体材料的最 高已占轨道 HOMO 能级、 所述第:二发光层的主发光体材料的最高已占轨道 HOMO能级、 所述第三发光层的主发光体材料的最高己占轨道 HOMO能级 和所述电荷阻挡层的主体材料的最高已占轨道 HOMO能级依次降低。
2. 根据权利要求 1所述的 OLED显示面板, 其中, 所述 OLED显示面 板依次包括:
覆盖整个像素的所述第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的所述第二发光层;
覆盖整个像素的所述第三发光层。
3. 根据权利要求 1所述的 OLED显示面板, 其中, 所述 OLED显示面 板依次包括:
覆盖整个像素的第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的所述第二发光层;
覆盖所述第二子像素和所述第三子像素的所述第三发光层。
4. 根据权利要求 1所述的 OLED显示面板, 其中, 所述 OLED显示面 板依次包括:
覆盖所述第一子像素和所述第二子像素的所述第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的所述第二发光层;
覆盖所述第二子像素和所述第三子像素的所述第三发光层。
5. 根据权利要求 1所述的 OLED显示面板, 其中, 所述 OLED显示面 板依次包括:
覆盖所述第一子像素和所述第二子像素的所述第一发光层;
覆盖所述第二子像素和所述第三子像素的所述电荷阻挡层;
覆盖所述第一子像素和所述第二子像素的所述第二发光层;
覆盖整个像素的所述第三发光层。
6.根据权利要求】-5中任一项所述的 OLED显示面板,其中,所述 OLED 显示面板具体包括:
半透光阳极层;
所述半透光阳极层上的空穴传输层;
所述空穴传输层上的所述第一发光层;
所述第一发光层上的所述电荷阻挡层;
所述电荷阻挡层上的所述第二发光层;
所述第二发光层上的所述第三发光层;
所述第三发光层上的电子传输层;
所述电子传输层上的金属阴极层。
7.根据权利要求 1 -5中任一项所述的 OLED显示面板,其中,所述 OLED 显示面板具体包括:
半透光阳极层;
所述半透光阳极层上的空穴传输层;
所述空穴传输层上的所述第三发光层;
所述第三发光层上的所述第二发光层;
所述第二发光层上的所述电荷阻挡层;
所述电荷阻挡层上的所述第一发光层; 所述第一发光层上的电子传输层;
所述电子传输层上的金属阴极层。
8. —种显示装置, 其中, 包括如权利要求 1 7中任一项所述的 OLED显 示面板。
9. 一种 OLED显示面板的制作方法, 所述 OLED显示面板的像素包括 有分别显示不同颜色的第一子像素、 第二子像素和第三子像素, 其中, 所述 制作方法包括:
形成覆盖包括所述第一子像素在内的至少两个相邻子像素的第一发光层; 形成覆盖所述第二子像素和所述第三子像素的电荷阻挡层;
形成覆盖所述第一子像素和所述第二子像素的第二发光层;
形成覆盖包括所述第三子像素在内的至少两个相邻子像素的第三发光层; 其中, 所述电荷阻挡层的主体材料的最低未占轨道 LIJMO能级、所述第 三发光层的主发光体材料的最低未占轨道 LUMO能级、所述第二发光层的主 发光体材料的最低未占轨道 LUMO能级和所述第一发光层的主发光体材料的 最低未占轨道 LUMO能级依次降低;或所述第一发光层的主发光体材料的最 高已占轨道 HOMO 能级、 所述第:二发光层的主发光体材料的最高已占轨道 HOMO能级、 所述第三发光层的主发光体材料的最高己占轨道 HOMO能级 和所述电荷阻挡层的主体材料的最高已占轨道 HOMO能级依次降低。
10. 根据权利要求 9所述的 OLED显示面板的制作方法, 其中, 所述制 作方法具体包括;
形成半透光阳极层;
形成所述半透光阳极层上的空穴传输层;
形成所述空穴传输层上的所述第一发光层;
形成所述第一发光层上的所述电荷阻挡层;
形成所述电荷阻挡层上的所述第二发光层;
形成所述第二发光层上的所述第三发光层;
形成所述第三发光层上的电子传输层;
形成所述电子传输层上的金属阴极层。
11 . 根据权利要求 9所述的 OLED显示面板的制作方法, 其中, 所述制 法具体包括:
形成半透光阳极层;
形成所述半透光阳极层上的空穴传输层;
形成所述空穴传输层上的所述第三发光层;
形成所述第三发光层上的所述第二发光层;
形成所述第二发光层上的所述电荷阻挡层;
形成所述电荷阻挡层上的所述第一发光层;
形成所述第一发光层上的电子传输层;
形成所述电子传输层上的金属阴极层。
12. —种电子产品, 其中, 包括如权利要求 8所述的显示装置。
PCT/CN2014/074155 2013-12-10 2014-03-27 Oled显示面板及其制作方法、显示装置、电子产品 WO2015085681A1 (zh)

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103779387B (zh) * 2014-01-06 2018-11-02 京东方科技集团股份有限公司 Oled显示面板及显示装置
CN104617130A (zh) * 2015-02-06 2015-05-13 京东方科技集团股份有限公司 一种oled像素单元、oled显示面板及显示装置
CN104617231B (zh) * 2015-02-06 2017-07-18 京东方科技集团股份有限公司 阵列基板及其制作方法、显示装置
CN104733506B (zh) 2015-04-01 2017-10-24 京东方科技集团股份有限公司 一种电致发光显示器件及显示装置
CN105226076B (zh) 2015-09-07 2018-03-27 深圳市华星光电技术有限公司 显示面板
CN106229300B (zh) 2016-08-23 2019-03-22 武汉华星光电技术有限公司 像素结构及制作方法
US10181574B2 (en) 2016-12-29 2019-01-15 Lg Display Co., Ltd. Organic light emitting device
US10418583B2 (en) * 2017-02-27 2019-09-17 Lg Display Co., Ltd. Organic light emitting device
CN107170900B (zh) * 2017-05-12 2019-11-22 京东方科技集团股份有限公司 Oled基板及其制备方法、显示装置
CN109768178B (zh) * 2019-01-22 2021-03-30 京东方科技集团股份有限公司 有机电致发光器件、显示基板、显示装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070046195A1 (en) * 2005-08-31 2007-03-01 Univision Technology Inc. Organic light-emitting display and fabricating method thereof
US20100090241A1 (en) * 2008-10-14 2010-04-15 Universal Display Corporation Emissive layer patterning for oled
JP2011048962A (ja) * 2009-08-26 2011-03-10 Canon Inc 有機el表示装置
CN102856507A (zh) * 2011-06-29 2013-01-02 三星显示有限公司 发光结构、包括发光结构的显示装置及其制造方法
CN103779387A (zh) * 2014-01-06 2014-05-07 京东方科技集团股份有限公司 Oled显示面板及显示装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7436113B2 (en) * 2005-04-25 2008-10-14 Eastman Kodak Company Multicolor OLED displays
KR100729089B1 (ko) * 2005-08-26 2007-06-14 삼성에스디아이 주식회사 유기 발광표시장치 및 그 제조방법
US20080238300A1 (en) * 2007-04-02 2008-10-02 Sang Tae Park Organic electroluminescence device and method for fabricating the same
JP5639181B2 (ja) * 2010-09-24 2014-12-10 株式会社日立製作所 有機発光装置及びこれを用いた光源装置
TW201324891A (zh) * 2011-12-05 2013-06-16 Au Optronics Corp 電激發光顯示面板之畫素結構

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070046195A1 (en) * 2005-08-31 2007-03-01 Univision Technology Inc. Organic light-emitting display and fabricating method thereof
US20100090241A1 (en) * 2008-10-14 2010-04-15 Universal Display Corporation Emissive layer patterning for oled
JP2011048962A (ja) * 2009-08-26 2011-03-10 Canon Inc 有機el表示装置
CN102856507A (zh) * 2011-06-29 2013-01-02 三星显示有限公司 发光结构、包括发光结构的显示装置及其制造方法
CN103779387A (zh) * 2014-01-06 2014-05-07 京东方科技集团股份有限公司 Oled显示面板及显示装置

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