WO2016123943A1 - 阵列基板及其制作方法、显示装置 - Google Patents

阵列基板及其制作方法、显示装置 Download PDF

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Publication number
WO2016123943A1
WO2016123943A1 PCT/CN2015/086229 CN2015086229W WO2016123943A1 WO 2016123943 A1 WO2016123943 A1 WO 2016123943A1 CN 2015086229 W CN2015086229 W CN 2015086229W WO 2016123943 A1 WO2016123943 A1 WO 2016123943A1
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layer
light emitting
light
emitting unit
illuminating
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PCT/CN2015/086229
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English (en)
French (fr)
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闫光
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京东方科技集团股份有限公司
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Priority to US15/021,736 priority Critical patent/US9978976B2/en
Publication of WO2016123943A1 publication Critical patent/WO2016123943A1/zh

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    • 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
    • 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
    • H10K59/351Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
    • 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
    • H10K71/10Deposition of organic active material
    • H10K71/16Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering
    • H10K71/166Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering using selective deposition, e.g. using a mask
    • 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
    • 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
    • H10K59/38Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]

Definitions

  • the present invention relates to the field of display, and in particular, to an array substrate, a manufacturing method thereof, and a display device.
  • OLEDs Organic electroluminescent devices
  • LCD liquid crystal
  • PDP plasma
  • the OLED display device is fabricated by using an FMM (fine metal mask) to prepare an OLED sub-pixel luminescent layer by an evaporation method, so that the resolution of the fabricated OLED display device is limited by the accuracy of the metal mask pattern size.
  • FMM fine metal mask
  • the technical problem to be solved by the present invention is how to solve the problem that the resolution of the OLED display device fabricated in the prior art is limited by the accuracy of the size of the metal mask pattern.
  • an array substrate comprising:
  • a first light emitting unit a second light emitting unit, a third light emitting unit, and a fourth light emitting unit disposed on the base substrate and arranged in a periodic manner
  • each of the first light emitting unit, the second light emitting unit, the third light emitting unit, and the fourth light emitting unit includes a first electrode, a second electrode, and an organic material functional layer,
  • the functional layer of the organic material includes a light emitting portion
  • the light emitting portion includes a first light emitting layer located in the second light emitting unit and the third light emitting unit, and a second light emitting layer in the first and second light emitting units, and in the third and fourth light emitting units a third luminescent layer;
  • the first light emitting layer is configured to emit light in at least one of the second light emitting unit and the third light emitting unit.
  • the first luminescent layer spans the second and third illuminating units, and in the second illuminating unit, the second luminescent layer is partially superposed on the first luminescent layer, in the The third luminescent layer in the three illuminating unit is partially superposed on the first luminescent layer.
  • the second light emitting layer and the third light emitting layer are disposed to contact each other at a boundary of the second light emitting unit and the third light emitting unit.
  • the first luminescent layer, the second luminescent layer, and the third luminescent layer each have a first width
  • the width of the first illuminating layer in the second illuminating unit and the third illuminating unit is a second width
  • the width of the second illuminating layer in the first illuminating unit and the second illuminating unit is a second width
  • the third illuminating layer is in the second
  • the width in the three light emitting unit and the fourth light emitting unit is a second width, wherein the second width is half of the first width.
  • the second light emitting unit is configured to emit only one of the first light emitting layer and the second light emitting layer therein, and the third light emitting unit is configured to be located only in the first light emitting layer and the first One of the three luminescent layers emits light.
  • only the first luminescent layer and the second luminescent layer are caused by controlling carrier transport characteristics of the first luminescent layer and the second luminescent layer in the second illuminating unit and/or an energy level relationship therebetween One of the lights;
  • the carrier characteristics of the second luminescent layer and the third luminescent layer are configured to facilitate hole transport such that only the first luminescent layer illuminates in the second illuminating unit and the third illuminating unit.
  • the second light emitting unit further includes a barrier layer between the first light emitting layer and the second light emitting layer, the barrier layer is configured to block injection into the first light emitting layer in the second light emitting unit And electrons or holes of one of the second luminescent layers are injected into the other of them; and/or
  • the third light emitting unit further includes a barrier layer between the first light emitting layer and the third light emitting layer, the barrier layer is configured to block injection into the first light emitting layer and the third light emitting in the third light emitting unit One of the layers of electricity Sub- or holes are injected into the other of them.
  • the barrier layer in the second and third light emitting units is a common barrier layer.
  • the common barrier layer causes the first light emitting layer to emit light in the second light emitting unit and the third light emitting unit, and the light color conversion layer is disposed in the second light emitting unit or the The light exit side of the third light emitting unit.
  • the illuminating colors of the first luminescent layer, the second luminescent layer, and the third luminescent layer are any one of green, dark blue, and light blue, and their illuminating colors are not Similarly, the light color conversion layer is used to convert green or dark blue or light blue to red.
  • the illuminating color of the first luminescent layer is green, and one of the second luminescent layer and the third luminescent layer is dark blue and the other luminescent color is light blue.
  • a light color conversion layer is disposed on a light emitting side of one of the first and second illuminating units;
  • the light color conversion layer is disposed on the light emitting side of one of the second and third illuminating units;
  • a light-color conversion layer is disposed on the light-emitting side of one of the third and fourth light-emitting units.
  • one of the first electrode and the second electrode is an anode and the other is a cathode.
  • the organic material functional layer further includes a hole functional layer between the light emitting layer and the anode and an electronic functional layer between the light emitting layer and the cathode.
  • At least one of the first electrode and the second electrode is a transparent electrode, and the light color conversion layer is disposed on a side of the transparent electrode or the substrate substrate away from the light emitting layer.
  • one of the first and second electrodes is disposed in a plurality and separated from each other, and the other electrode is disposed in the form of a common electrode.
  • a display device comprising the array substrate according to the above.
  • a method for fabricating the above array substrate comprises the following steps:
  • a second electrode is formed at positions corresponding to the first, second, third, and fourth light emitting units.
  • Embodiments of the present invention provide a first light emitting layer in a second light emitting unit and a third light emitting unit, a second light emitting layer in the first light emitting unit and the second light emitting unit, and a third light emitting layer in the first In the three light emitting unit and the fourth light emitting unit, only one of the second light emitting unit and the third light emitting unit emits light and a light color conversion layer is disposed on the light emitting side, so that the array substrate can emit light of four colors. Moreover, when the light-emitting layer of the OLED display device is fabricated, the display product with higher resolution can be produced without replacing the fine metal mask.
  • FIG. 1 is a schematic view of an array substrate according to a first embodiment of the present invention
  • FIG. 2 is a schematic view of an array substrate according to a second embodiment of the present invention.
  • FIG. 3 is a schematic view of an array substrate according to a third embodiment of the present invention.
  • FIG. 4 is a schematic view of an array substrate in accordance with a fourth embodiment of the present invention.
  • FIG. 1 is a schematic view of an array substrate including a substrate substrate 1, and a first light emitting unit 100 disposed on the base substrate 1 and periodically arranged, and a second light emitting light according to a first embodiment of the present invention.
  • Each of the first light emitting unit 100, the second light emitting unit 200, the third light emitting unit 300, and the fourth light emitting unit 400 includes a first electrode 2, a second electrode 3, and an organic material functional layer .
  • the organic material functional layer includes a light emitting portion.
  • Light emitting part package a first luminescent layer 4 located in the second illuminating unit 200 and the third illuminating unit 300 and a second illuminating layer 5 in the first illuminating unit 100 and the second illuminating unit 200 and at the third illuminating unit 300 and fourth The third luminescent layer 6 in the light emitting unit 400.
  • the first luminescent layer 4 is disposed under the second luminescent layer 5 and the third luminescent layer 6, for example, in the second illuminating unit 200, the second luminescent layer 5 is superposed on the first luminescent layer. 4, and in the third light emitting unit 300, the third light emitting layer 6 is superposed on the first light emitting layer 4.
  • the first light emitting layer 4 may be disposed above the second light emitting layer 5 and the third light emitting layer 6.
  • the first light emitting unit 100 includes a left portion of the second light emitting layer 5 that is not superposed on the first light emitting layer 4 (ie, has only one light emitting layer); the second light emitting unit 200 includes one another stacked thereon a portion of the first luminescent layer 4 and the second luminescent layer 5 together (ie having two luminescent layers); the third illuminating unit 300 comprising a third luminescent layer 6 and a first illuminating layer stacked thereon A portion of the layer 4 (i.e., having two light-emitting layers); the fourth light-emitting unit 400 includes a right portion (i.e., having one light-emitting layer) of the third light-emitting layer 6 that is not stacked on the first light-emitting layer 4.
  • the first light emitting layer 4 straddles (area of) the second light emitting unit 200 and the third light emitting unit 300.
  • the second light emitting layer 5 and the third light emitting layer 6 are disposed to be in contact with each other at the boundary of the second light emitting unit 200 and the third light emitting unit 300.
  • the first light emitting layer 4 and the second light emitting layer 5 completely overlap and only one of the light emitting layers in the second light emitting unit 200 emits light;
  • the first light emitting layer 4 and the third light emitting layer 6 completely overlap and only one of the light emitting layers in the third light emitting unit 300 emits light; and the first light emitting The layer 4 emits light in at least one of the second light emitting unit 200 and the third light emitting unit 300.
  • the light-emitting conversion layer disposed on the light-emitting side is further included 7.
  • the light color conversion layer 7 is disposed on the light emitting side of the first light emitting unit 100 or the second light emitting unit 200.
  • the light color conversion layer 7 is disposed on the light-emitting side of the second light-emitting unit 200 or the third light-emitting unit 300. If the third light-emitting layer 6 emits light in the third light-emitting unit 300 and the fourth light-emitting unit 400, the light color conversion layer 7 is disposed on the light-emitting side of the third light-emitting unit 300 or the fourth light-emitting unit 400.
  • the light-emitting side of each of the light-emitting units is the side from which the light emitted from the light-emitting layer is emitted.
  • the light emitted by the light-emitting layer in the third light-emitting unit 300 sequentially passes through the first electrode 2 .
  • the light color conversion layer 7 can be disposed on the first electrode 2 away from the light emitting layer.
  • One side; preferably, the light color conversion layer 7 may be disposed on a side of the base substrate 1 away from the light emitting layer.
  • the second light-emitting layer 5 is disposed in the first light-emitting unit 100 and the first light-emitting layer 4 by being disposed in the second light-emitting unit 200 and the third light-emitting unit 300.
  • the third light emitting layer 6 is disposed in the third light emitting unit 300 and the fourth light emitting unit 400, and one of the first and second light emitting layers 4, 5 in the second light emitting unit 200 is illuminated.
  • the second luminescent layer 5 and the third luminescent layer 6 are located in the same layer, and the first luminescent layer 4 is located below the layer where they are located, but this is only an example, and those skilled in the art
  • the relative positional relationship of the first, second and third luminescent layers 4, 5, 6 can be specifically set as desired, for example, they are respectively disposed on different layers and are spaced apart by a transparent insulating layer.
  • the first electrode may be an anode or a cathode.
  • the invention is not specifically limited herein.
  • the second electrode is a cathode; when the first electrode is a cathode, the second electrode is an anode.
  • the organic material functional layer is used to illuminate each of the light emitting units, and may further include an electronic functional layer 9 and a hole functional layer 8 in addition to the light emitting layer, wherein the electronic functional layer includes an electron transport layer and electron injection At least one of the layers, the hole function layer includes at least one of a hole transport layer and a hole injection layer, and the hole function layer 8 is disposed between the anode and the light emitting layer, and the electronic functional layer 9 is disposed at the cathode Between the luminescent layers.
  • the first electrode 2 is an anode and the second electrode 3 is a cathode
  • the structure thereof is as shown in FIG. 1.
  • the first electrode 2 is a cathode and the second electrode 3 is an anode
  • the structure thereof is as shown in FIG. Show.
  • At least one of the first electrode 2 and the second electrode 3 is a transparent electrode, and the light color conversion layer 7 is disposed on a side of the transparent electrode away from the light emitting layer.
  • the first electrode 2 is a transparent material and the second electrode 3 is an opaque material, the light emitted from the luminescent layer is emitted from the first electrode 2, and the light color conversion layer 7 is disposed at the first electrode 2 as shown in FIG.
  • the light emitted from the light emitting layer can be emitted from the first electrode 2 and the second electrode 3.
  • the light color conversion layer 7 may be disposed on both sides of the first electrode 2 and the second electrode 3 away from the light-emitting layer.
  • one of the first electrode 2 and the third electrode 3 can be set as a plurality of independent small
  • the electrodes are arranged as a common electrode.
  • the first electrode 2 is composed of a plurality of individual electrodes
  • the second electrode 3 is constituted by an electrode covering the first to fourth light emitting units 100, 200, 300, 400 with an area.
  • the electrode arrangement shown in FIG. 1 is only an example, and those skilled in the art can specifically set the forms of the first electrode 2 and the second electrode 3 as needed.
  • the carriers of the two light emitting layers in the second light emitting unit 200 and the third light emitting unit 300 may be controlled.
  • the transmission characteristics and/or the energy level relationship between the two are such that the holes of the anode or the electrons of the cathode cannot reach one of the light-emitting layers.
  • the first electrode 2 is a cathode and the second electrode 3 is an anode, so that the carrier characteristics of the second luminescent layer 5 and the third luminescent layer 6 are favorable for hole transport, then In the second light emitting unit 200 and the third light emitting unit 300, holes of the second electrode 3 do not or rarely stay in the second light emitting layer 5 and the third light emitting layer 6 and flow into the first light emitting layer 4, and The first light-emitting layer 4 meets the electrons of the first electrode 2 to cause the first light-emitting layer 4 to emit light, and the second light-emitting layer 5 and the third light-emitting layer 6 do not emit light due to no or very few holes, thereby realizing the second light-emitting unit. Only the first luminescent layer 4 of the 200 and the third illuminating unit 300 emits light.
  • only one luminescent layer can be illuminated by the energy level design between the two luminescent layers in the illuminating unit.
  • the second electrode 3 is an anode.
  • the second illuminating layer 5 and the third illuminating layer 6 may be controlled to be the same or very close to the HOMO (highest occupied track) level of the first illuminating layer 4, and then in the second illuminating unit 200 and the third illuminating unit 300,
  • the holes of the second electrode 3 do not or rarely stay in the second light-emitting layer 5 and the third light-emitting layer 6 and flow into the first light-emitting layer 4, and the second light-emitting layer 5 and the third light-emitting layer 6 and
  • the LUMO (lowest unoccupied orbital) energy level of a light-emitting layer 4 is largely different, so that the electrons of the first electrode 2 substantially stay in the first light-emitting layer 4, thereby realizing only the second light-emitting unit 200 and the third light-emitting unit 300.
  • the first luminescent layer 4 emits light.
  • a barrier layer between two different light-emitting layers may be disposed in the second light-emitting unit 200 and the third light-emitting unit 300, and the barrier layer is used to block injection into one of the same light-emitting units. The electrons or holes of the light-emitting layer are injected into the other light-emitting layer.
  • FIG. 4 there is shown a schematic view of an array substrate in accordance with a fourth embodiment of the present invention.
  • the structure of the array substrate is substantially the same as that of the array substrate in FIG. 1 , except that a barrier layer 10 between the two different light-emitting layers is added to the second light-emitting unit 200 and the third light-emitting unit 300.
  • the barrier layer 10 is configured to cause only one of the second light emitting unit 200 and the third light emitting unit 300 to emit light.
  • the barrier layer 10 may be Hole blocking layer when the first electrode 2
  • the barrier layer 10 When a voltage is applied between the second electrodes 3, in the second light emitting unit 200 and the third light emitting unit 300, holes in the first electrode 2 are blocked by the barrier layer 10 so as not to enter the second light emitting layer 5 and the third layer.
  • the electrons of the second electrode 3 can pass through the barrier layer 10 and meet the electrons of the first electrode 2 in the first light-emitting layer 4 Thereby, the first light-emitting layer 4 emits light.
  • the barrier layers in the second lighting unit 200 and the third lighting unit 300 may be of the same type, preferably the same barrier layer (ie, a common barrier layer).
  • the barrier layer may be an electron blocking layer or a hole blocking layer, and the barrier layer causes the first light emitting layer 4 in the second light emitting unit 200 and the third light emitting unit 300 to emit light, that is, the second light emitting unit
  • the barrier layer in the 200 and the third light emitting unit 300 may be simultaneously formed in one patterning process, in which case the light color conversion layer 7 is provided on the light emitting side of the second light emitting unit 200 or the third light emitting unit 300. .
  • the array substrate includes a plurality of pixel units arranged in a matrix, each of the pixel units including at least one of the above-described first, second, third, and fourth light-emitting units
  • the light emitted by each of the light-emitting units is different.
  • the light emitted by the first light-emitting layer 4, the second light-emitting layer 5, and the third light-emitting layer 6 is different, and passes through the light-color conversion layer. 7 Converting light emitted by any one of the light-emitting layers to realize a four-pixel type OLED display device.
  • the energy of green light and blue light is higher than the energy of red light, it is easier to convert green light and blue light into red light, and the first light-emitting layer 4, the second light-emitting layer 5, and the
  • the illuminating color of the third luminescent layer 6 is any one of green, dark blue, and light blue, and the illuminating colors of the three luminescent layers are different, and the green or dark blue or light blue is passed through the light color conversion layer 7. Converted to red to achieve a green, dark blue, light blue, red four-pixel OLED display device.
  • the red light can be converted by green light.
  • the second illuminating unit 200 and the In the three light-emitting units 300 the first light-emitting layer 4 emits light, and the light-color conversion layer 7 is disposed on the light-emitting side of the second light-emitting unit 200 or the third light-emitting unit 300, so that the light-emitting color of the first light-emitting layer 4 can be made green.
  • One of the second luminescent layer 5 and the third luminescent layer 6 is dark blue, and the other illuminating color is light blue.
  • the green light of the first luminescent layer 4 is converted into red by a light color conversion layer 7 in one illuminating unit. Light.
  • the second light emitting layer 5 is disposed in the first light emitting unit 100 and the second light emitting unit 200 by disposing the first light emitting layer 4 in the second light emitting unit 200 and the third light emitting unit 300.
  • the third luminescent layer 6 is disposed in the third illuminating unit 300 and the fourth illuminating unit 400, so that the same illuminating layer is formed in two adjacent illuminating units, thereby reducing the FMM (fine metal mask).
  • the width of the luminescent layer in the array substrate is K, and when the array substrate in the embodiment of the present invention is used, the first illuminating of the width K may be first made in the second illuminating unit 200 and the third illuminating unit 300.
  • each light-emitting unit includes a first light-emitting layer of K/2 width
  • a second light-emitting layer 5 having a width K is formed in the first light-emitting unit 100 and the second light-emitting unit 200 (each light-emitting unit includes K/ a second luminescent layer of width 2)
  • a third luminescent layer 6 of width K is formed in the third illuminating unit 300 and the fourth illuminating unit 400
  • an embodiment of the present invention further provides a display device including the above array substrate.
  • the display device provided by the embodiment of the present invention may be any product or component having a display function such as a notebook computer display screen, a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, or the like.
  • an embodiment of the present invention further provides a method for fabricating the above array substrate, the array substrate comprising a substrate substrate 1 and a first light emitting unit formed periodically on the substrate substrate 1 100.
  • the second lighting unit 200, the third lighting unit 300, and the fourth lighting unit 400, wherein the forming the first lighting unit 100, the second lighting unit 200, the third lighting unit 300, and the fourth lighting unit 400 include:
  • the method for fabricating the array substrate further includes: forming a light color conversion layer 7 on the light exiting side in one of the two light emitting units having the same light emitting layer and both emitting light.
  • the electronic functional layer 9 and the hole functional layer 8 may be formed, wherein the electronic functional layer 9 includes at least at least one of an electron transport layer and an electron injection layer.
  • a hole function layer 8 includes at least one of a hole transport layer and a hole injection layer, and a hole function layer 8 is formed between the anode and the light-emitting layer, and an electron function layer 9 is formed between the cathode and the light-emitting layer. between.
  • the method further comprises:
  • the barrier layer 10 Forming a barrier layer 10 at a position of the second light emitting unit 200 and the third light emitting unit 300, the barrier layer 10 for blocking electrons or holes injected into one of the light emitting layers in the same light emitting unit Inject into another luminescent layer.
  • the barrier layers 10 in the second illuminating unit 200 and the third illuminating unit 300 may be of the same type, that is, both are electron blocking layers or both are hole blocking layers, and the blocking layer 10 makes the second illuminating unit 200 Neutralizing the first illuminating layer 4 in the third illuminating unit 300, that is, the blocking layer 10 in the second illuminating unit 200 and the third illuminating unit 300 may be simultaneously formed in one patterning process, in this case,
  • the forming the color conversion layer 7 on the light exiting side comprises:
  • the light color conversion layer 7 is formed on the light emitting side of the second light emitting unit 200 or the third light emitting unit 300.
  • the first light emitting layer 4 having a width K may be first formed in the second light emitting unit 200 and the third light emitting unit 300 (each light emitting)
  • the unit includes a first luminescent layer of K/2 width, and then a second luminescent layer 5 having a width K is formed in the first illuminating unit 100 and the second illuminating unit 200 (each illuminating unit includes a second illuminating K/2 width)
  • a third light-emitting layer 6 having a width K is further formed in the third light-emitting unit 300 and the fourth light-emitting unit 400, so that each light-emitting unit Both include a K/2 width luminescent layer.
  • the width of each of the light-emitting units fabricated by the present invention is smaller, and the resolution of the OLED display device can be improved.
  • the width of each of the light-emitting layers is K/2
  • the width thereof is also required to be K/2, therefore, the production of the light color conversion layer can be used to produce higher resolution lithography techniques.
  • the light emitted by the first light-emitting layer 4, the second light-emitting layer 5, and the third light-emitting layer 6 may be different by using different light-emitting materials, and passed through
  • the light color conversion layer 7 is formed to convert light emitted by any one of the light emitting layers so that a four-pixel type OLED display device can be realized.
  • the green light and the blue light are converted into If the red light is more easily, the light-emitting colors of the first light-emitting layer 4, the second light-emitting layer 5, and the third light-emitting layer 6 may be any one of green, dark blue, and light blue, and three The luminescent colors of the luminescent layers are different, and the green or dark blue or light blue is converted into red by the light color conversion layer, thereby realizing a green, dark blue, light blue, and red four-pixel OLED display device.
  • the light color conversion layer 7 is formed on the light emitting side of the second light emitting unit 200 or the third light emitting unit 300 due to In general, the luminous efficiency of the green light-emitting material is higher than that of the blue light-emitting material.
  • the light-emitting color of the first light-emitting layer 4 may be green, and one of the second light-emitting layer 5 and the third light-emitting layer 6 may be dark blue.
  • the other illuminating color is light blue, and the light color conversion layer 7 converts the green light of the first luminescent layer 4 into red light, thereby realizing a green, dark blue, light blue, red four-pixel OLED display with higher luminous efficiency.
  • Device The other illuminating color is light blue, and the light color conversion layer 7 converts the green light of the first luminescent layer 4 into red light, thereby realizing a green, dark blue, light blue, red four-pixel OLED display with higher luminous efficiency.

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  • Electroluminescent Light Sources (AREA)

Abstract

一种阵列基板及其制作方法、显示装置。该阵列基板包括:衬底基板(1);和设置在衬底基板(1)上并呈周期性排布的第一发光单元(100)、第二发光单元(200)、第三发光单元(300)和第四发光单元(400)。该第一发光单元(100)、该第二发光单元(200)、该第三发光单元(300)和该第四发光单元(400)中的每个发光单元包括第一电极(2)、第二电极(3)和有机材料功能层,该有机材料功能层包括发光部,其中该发光部包括位于第二发光单元(200)和第三发光单元(300)中的第一发光层(4),和设置在第一发光层(4)上的在第一发光单元(100)和第二发光单元(200)中的第二发光层(5),和设置在第一发光层(4)上的在第三发光单元(300)和第四发光单元(400)中的第三发光层(6)。该第一发光层(4)被配置成在该第二发光单元(200)和该第三发光单元(300)的至少一个中发光。

Description

阵列基板及其制作方法、显示装置
本申请要求于2015年2月6日递交的、申请号为201510065282.8、发明名称为“阵列基板及其制作方法、显示装置”的中国专利申请的优先权,其全部内容通过引用并入本申请中。
技术领域
本发明涉及显示领域,尤其涉及一种阵列基板及其制作方法、显示装置。
背景技术
有机电致发光器件(OLED)因其具有自发光、全固态、宽视角、响应快等诸多优点而被认为在平板显示中有着巨大的应用前景,是继液晶(LCD)、等离子(PDP)之后的新一代平板显示产品。
目前,OLED显示器件的制作方法是采用FMM(精细金属掩膜)通过蒸镀方法制备RGB子像素的发光层,从而使得制作的OLED显示器件的分辨率受制于金属掩膜图形尺寸的精度。
发明内容
本发明要解决的技术问题是如何解决现有技术中制作的OLED显示器件的分辨率受制于金属掩膜图形尺寸的精度的问题。
根据本发明的一个方面,提供了一种阵列基板,包括:
衬底基板;和
设置在衬底基板上并呈周期性排布的第一发光单元、第二发光单元、第三发光单元和第四发光单元,
其中,所述第一发光单元、所述第二发光单元、所述第三发光单元和所述第四发光单元中的每个发光单元包括第一电极、第二电极和有机材料功能层,所述有机材料功能层包括发光部,
其中所述发光部包括位于第二发光单元和第三发光单元中的第一发光层和在第一发光单元和第二发光单元中的第二发光层和在第三发光单元和第四发光单元中的第三发光层;
所述第一发光层被配置成在所述第二发光单元和所述第三发光单元的至少一个中发光。
在一个示例中,所述第一发光层横跨第二和第三发光单元,在所述第二发光单元中所述第二发光层部分地叠置在第一发光层上,在所述第三发光单元中所述第三发光层部分地叠置在第一发光层上。
在一个示例中,所述第二发光层和第三发光层设置成在第二发光单元和第三发光单元的边界处彼此接触。
在一个示例中,第一发光层、第二发光层和第三发光层均具有第一宽度,
第一发光层在第二发光单元和第三发光单元中的宽度为第二宽度,第二发光层在第一发光单元和第二发光单元中的宽度为第二宽度,第三发光层在第三发光单元和第四发光单元中的宽度为第二宽度,其中第二宽度为第一宽度的一半。
在一个示例中,所述第二发光单元被配置成仅位于其中的第一发光层和第二发光层中的一个发光,并且第三发光单元被配置成仅位于其中的第一发光层和第三发光层中的一个发光。
在一个示例中,通过控制第二发光单元中的第一发光层和第二发光层的载流子传输特性和/或二者间的能级关系来使得只有第一发光层和第二发光层中的一个发光;
通过控制第三发光单元中的第一发光层和第三发光层的载流子传输特性和/或二者间的能级关系来使得只有第一发光层和第三发光层中的一个发光。
在一个示例中,所述第二发光层和第三发光层的载流子特性被配置成有利于空穴传输,使得在第二发光单元和第三发光单元中只有第一发光层发光。
在一个示例中,在第一电极为阴极和第二电极为阳极时,控制第二发光层、第三发光层与第一发光层的最高已占用轨道能级相同或者十分接近,并使第二发光层、第三发光层与第一发光层的最低未占轨道能级相差较大,使得第二发光单元与第三发光单元中只有第一发光层发光。
在一个示例中,所述第二发光单元还包括位于第一发光层与第二发光层之间的阻挡层,所述阻挡层用于在所述第二发光单元中阻挡注入到第一发光层和第二发光层中的一个的电子或空穴注入到它们中的另一个中;和/或
在所述第三发光单元还包括位于第一发光层与第三发光层之间的阻挡层,所述阻挡层用于在所述第三发光单元中阻挡注入到第一发光层和第三发光层中的一个的电 子或空穴注入到它们中的另一个中。
在一个示例中,在第二发光单元和第三发光单元中的阻挡层是一个公共阻挡层。
在一个示例中,所述公共阻挡层使在所述第二发光单元中和所述第三发光单元中均为第一发光层发光,光色转换层设在所述第二发光单元或所述第三发光单元的出光侧。
在一个示例中,所述第一发光层、所述第二发光层以及所述第三发光层的发光颜色为绿色、深蓝色、浅蓝色中的任一种,且它们的发光颜色各不相同,所述光色转换层用于将绿色或深蓝色或浅蓝色转换为红色。
在一个示例中,所述第一发光层的发光颜色为绿色,所述第二发光层和所述第三发光层中一个发光颜色为深蓝且另一个发光颜色为浅蓝色。
在一个示例中,当第二发光层在第一和第二发光单元中同时发光时,在第一和第二发光单元中的一个发光单元的出光侧设置光色转换层;或
当第一发光层在第二和第三发光单元中同时发光时,在第二和第三发光单元中的一个发光单元的出光侧设置光色转换层;或
当第三发光层在第三和第四发光单元中同时发光时,在第三和第四发光单元中的一个发光单元的出光侧设置光色转换层。
在一个示例中,所述第一电极与所述第二电极中一个为阳极则另一个为阴极。
在一个示例中,所述有机材料功能层还包括位于所述发光层与阳极之间的空穴功能层以及位于所述发光层与所述阴极之间的电子功能层。
在一个示例中,所述第一电极与所述第二电极中至少一个为透明电极,所述光色转换层设置在所述透明电极或衬底基板远离所述发光层的一侧。
在一个示例中,所述第一和第二电极中的一个设置成多个且彼此分离的形式,而另一个电极设置成公共电极的形式。
根据本发明的另一方面,提供了一种显示装置,包括根据上述的阵列基板。
根据本发明的还一方面,提供了一种上述的阵列基板的制作方法,所述包括以下步骤:
在所述衬底基板上对应于所述第一发光单元、第二发光单元、第三发光单元和第四发光单元的位置处形成第一电极:
在形成有所述第一电极的所述衬底基板上,在对应于所述第二发光单元和所述 第三发光单元的位置处形成第一发光层;
在形成有所述第一发光层的所述衬底基板上,在对应于所述第一发光单元和第二发光单元的位置处形成第二发光层,在所述第二发光单元中所述第二发光层部分地叠置在所述第一发光层上;
在形成有所述第二发光层的所述衬底基板上,在对应于所述第三发光单元和第四发光单元的位置处形成第三发光层,在所述第三发光单元中所述第三发光层部分地叠置在所述第一发光层上;
在形成有所述第三发光层的所述衬底基板上,在对应于所述第一发光单元、第二发光单元、第三发光单元和第四发光单元的位置处形成第二电极。
本发明的实施例通过将第一发光层设置在第二发光单元和第三发光单元中,将第二发光层设置在第一发光单元和第二发光单元中,将第三发光层设置在第三发光单元和第四发光单元中,并使第二发光单元和第三发光单元中只有一个发光层发光以及在出光侧设置光色转换层,从而使该阵列基板可以发出四种颜色的光,并且在制作OLED显示器件的发光层时,可以在不更换精细金属掩膜的情况下,能够制作分辨率更高的显示产品。
附图说明
图1是根据本发明的第一实施例的阵列基板的示意图;;
图2是根据本发明的第二实施例的阵列基板的示意图;
图3是根据本发明的第三实施例的阵列基板的示意图;
图4是根据本发明的第四实施例的阵列基板的示意图。
具体实施方式
下面结合附图和实施例,对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明,但不用来限制本发明的范围。
图1是根据本发明的第一实施例的阵列基板的示意图,该阵列基板包括衬底基板1、以及设置在衬底基板1上并呈周期性排布的第一发光单元100、第二发光单元200、第三发光单元300和第四发光单元400。所述第一发光单元100、所述第二发光单元200、所述第三发光单元300和所述第四发光单元400中的每个包括第一电极2、第二电极3和有机材料功能层。所述有机材料功能层包括发光部。所述发光部包 括位于第二发光单元200和第三发光单元300中的第一发光层4和在第一发光单元100和第二发光单元200中的第二发光层5和在第三发光单元300和第四发光单元400中的第三发光层6。
具体地,如图1所示,第一发光层4设置在第二发光层5和第三发光层6的下面,例如在第二发光单元200中第二发光层5叠置在第一发光层4上,并且在第三发光单元300中第三发光层6叠置在第一发光层4上。可替代地,第一发光层4可以设置在第二发光层5和第三发光层6的上方。
所述第一发光单元100包括第二发光层5的未叠置在第一发光层4上的左边部分(即仅具有一个发光层);所述第二发光单元200包括在其中的相互叠置在一起的第一发光层4和第二发光层5的部分(即具有两个发光层);所述第三发光单元300包括其中的相互叠置在一起的第三发光层6和第一发光层4的部分(即具有两个发光层);第四发光单元400包括所述第三发光层6的未叠置在第一发光层4上的右边部分(即具有一个发光层)。第一发光层4横跨第二发光单元200和第三发光单元300(的区域)。在一个示例中,第二发光层5和第三发光层6设置成在第二发光单元200和第三发光单元300的边界处彼此接触。
此外,在所述第二发光单元200中,所述第一发光层4和所述第二发光层5完全重叠且在所述第二发光单元200中仅它们中的一个发光层发光;在所述第三发光单元300中,所述第一发光层4和所述第三发光层6完全重叠且在所述第三发光单元300中仅它们中的一个发光层发光;且所述第一发光层4在第二发光单元200和所述第三发光单元300的至少一个内发光。
在具有相同发光层(同一第一发光层、同一第二发光层或同一第三发光层)且均发光的两个发光单元中的一个发光单元中,还包括设置在出光侧的光色转换层7。例如,若在第一发光单元100和第二发光单元200中均为第二发光层5发光,则该光色转换层7设置在第一发光单元100或者第二发光单元200的出光侧。若第二发光单元200和第三发光单元300中均为第一发光层4发光,则该光色转换层7设置在第二发光单元200或者第三发光单元300的出光侧。若第三发光单元300和第四发光单元400中均为第三发光层6发光,则该光色转换层7设置在第三发光单元300或者第四发光单元400的出光侧。每个发光单元的出光侧为其中的发光层发出的光出射的一侧,例如,对于图1所示的阵列基板,第三发光单元300中的发光层发出的光依次通过第一电极2、衬底基板1出射,则可将光色转换层7设置在第一电极2远离发光层 的一侧;优选地,可将光色转换层7设置在衬底基板1远离发光层的一侧。
在根据本发明第一实施例的阵列基板中,通过将第一发光层4设置在第二发光单元200和第三发光单元300中,将第二发光层5设置在第一发光单元100和第二发光单元200中,将第三发光层6设置在第三发光单元300和第四发光单元400中,并使第二发光单元200中的第一和第二发光层4、5中的一个发光层和第三发光单元300中的第一和第三发光层4、6中的一个发光层发光以及在出光侧设置光色转换层7,从而使该阵列基板可以发出四种颜色的光,并且在制作OLED显示器件的发光层时,可以在不更换精细金属掩膜的情况下,能够制作分辨率更高的显示产品。
需要说明的是,如图1所示,第二发光层5和第三发光层6位于同一层,而第一发光层4位于他们所在层的下方,但是这仅是一个示例,本领域技术人员可以根据需要具体设置第一、第二和第三发光层4、5、6的相对位置关系,例如将他们分别设置在不同的层上,并且用透明绝缘层间隔开。
此外,在上述的阵列基板中,第一电极可以为阳极,也可以为阴极。本发明在此不作具体限定,当第一电极为阳极时,第二电极为阴极;当第一电极为阴极时,第二电极为阳极。
在本实施例中,有机材料功能层用于使各发光单元发光,除包括发光层外,还可以包括电子功能层9和空穴功能层8,其中,电子功能层包括电子传输层和电子注入层中的至少一种,空穴功能层包括空穴传输层和空穴注入层中的至少一种,且空穴功能层8设置在阳极与发光层之间,电子功能层9设置在阴极与发光层之间。例如,当第一电极2为阳极时,第二电极3为阴极时,其结构如图1所示,当第一电极2为阴极时,第二电极3为阳极时,其结构如图2所示。
此外,在本实施例中,所述第一电极2与所述第二电极3中至少一个为透明电极,所述光色转换层7设置在所述透明电极远离所述发光层的一侧。例如,当第一电极2为透明材料,第二电极3为不透明材料时,发光层发出的光从第一电极2射出,则光色转换层7如图1所示设置在第一电极2远离发光层的一侧;当第一电极2为不透明材料,第二电极3为透明材料时,发光层发出的光从第二电极3射出,则光色转换层7如图3所示设置在第二电极3远离发光层的一侧,当第一电极2和第二电极3均为透明材料时(即双面显示),发光层发出的光从第一电极2和第二电极3均可射出,则可在第一电极2和第二电极3的远离发光层侧均设置光色转换层7。
如需要说明的是,第一电极2和第三电极3中的一个可以设置成多个独立的小 电极,而另一个则设置成公共电极。或者说,如图1所示,第一电极2由多个单独的电极构成,而第二电极3由一个面积覆盖第一至第四发光单元100,200,300,400的电极构成。可以理解,图1所示的电极布置方式仅是一个示例,本领域技术人员可以根据需要具体设置第一电极2和第二电极3的形式。
在本实施例中,为了使得在第二发光单200与第三发光单元300中只有一个发光层发光,可以通过控制第二发光单元200与第三发光单元300中两个发光层的载流子传输特性和/或二者间的能级关系来使阳极的空穴或者阴极的电子不能到达其中的一个发光层来实现。
例如,对于图2所示的阵列基板,第一电极2为阴极,第二电极3为阳极,可以使第二发光层5和第三发光层6的载流子特性有利于空穴传输,则在第二发光单元200与第三发光单元300中,第二电极3的空穴没有或者极少在第二发光层5和第三发光层6中停留而流入第一发光层4中,并在第一发光层4中与第一电极2的电子相遇使第一发光层4发光,而第二发光层5与第三发光层6因没有或者极少空穴不发光,从而实现第二发光单元200与第三发光单元300中只有第一发光层4发光。
此外,也可以通过发光单元中两个发光层之间的能级设计实现只有一个发光层发光,例如,对于图2所示的阵列基板,第一电极2为阴极时,第二电极3为阳极,可以控制第二发光层5、第三发光层6与第一发光层4的HOMO(最高已占用轨道)能级相同或者十分接近,则在第二发光单元200与第三发光单元300中,第二电极3的空穴不会或者极少在第二发光层5和第三发光层6中停留而流入第一发光层4中,并使第二发光层5、第三发光层6与第一发光层4的LUMO(最低未占轨道)能级相差较大,使得第一电极2的电子基本停留在第一发光层4中,从而实现第二发光单元200与第三发光单元300中只有第一发光层4发光。
除上述方法外,还可在第二发光单元200和第三发光单元300中设置位于两个不同发光层之间的阻挡层,该阻挡层用于在同一个发光单元中,阻挡注入到其中一个发光层的电子或空穴注入到另一个发光层。
参见图4,其是根据本发明的第四实施例的阵列基板的示意图。该阵列基板的结构基本与图1中的阵列基板的结构相同,不同之处在于在第二发光单元200和第三发光单元300中增设位于各自的两个不同发光层之间的阻挡层10,该阻挡层10用于使第二发光单元200和第三发光单元300中都只有一个发光层发光,例如,当第一电极2为阳极,第二电极3为阴极时,该阻挡层10可以为空穴阻挡层,当第一电极2与 第二电极3之间被施加电压时,在第二发光单元200与第三发光单元300中,第一电极2中的空穴被阻挡层10阻挡从而不会进入第二发光层5与第三发光层6中,从而不会使第二发光层5与第三发光层6发光,而第二电极3的电子能够通过阻挡层10并在第一发光层4中与第一电极2的电子相遇从而使第一发光层4发光。
在本实施例中,第二发光单元200与第三发光单元300中的阻挡层可以为相同类型,优选地为同一个阻挡层(即公共阻挡层)。该阻挡层可以是电子阻挡层或者空穴阻挡层,且该阻挡层使所述第二发光单元200中和所述第三发光单元300中均为第一发光层4发光,即第二发光单元200和第三发光单元300中的阻挡层可以在一次构图工艺中同时形成,在此情况下,光色转换层7设在所述第二发光单元200或所述第三发光单元300的出光侧。
此外,对于OLED显示器件,其阵列基板包括呈矩阵排列的多个像素单元,每个像素单元均包括至少一组上述的第一发光单元、第二发光单元、第三发光单元和第四发光单元,每个发光单元发出的光不同,在本发明的实施例中,通过使第一发光层4、第二发光层5以及第三发光层6发出的光各不相同,并通过光色转换层7转换其中任一个发光层发出的光从而实现四像素型OLED显示器件。例如,由于绿光和蓝光的能量高于红光的能量,因此,将绿光和蓝光转换为红光更为容易,则可使第一发光.4、所述第二发光层5以及所述第三发光层6的发光颜色为绿色、深蓝色、浅蓝色中的任一种,且三个发光层的发光颜色各不相同,通过光色转换层7将绿色或深蓝色或浅蓝色转换为红色,从而实现绿、深蓝、浅蓝、红四像素型OLED显示器件。
进一步地,由于一般情况下绿色发光材料的发光效率高于蓝色发光材料,则可使红光通过绿光转换得到,例如,在图4所示的阵列基板中,第二发光单元200和第三发光单元300中均为第一发光层4发光,光色转换层7设置在第二发光单元200或者第三发光单元300的出光侧,则可以使第一发光层4的发光颜色为绿色,第二发光层5和第三发光层6中一个发光颜色为深蓝,另一个发光颜色为浅蓝色,通过光色转换层7将第一发光层4的绿光在一个发光单元中转换为红光。
本发明实施方式提供的阵列基板,通过将第一发光层4设置在第二发光单元200和第三发光单元300中,将第二发光层5设置在第一发光单元100和第二发光单元200中,将第三发光层6设置在第三发光单元300和第四发光单元400中,使得同一个发光层制作在相邻两个发光单元中,进而可以降低对FMM(精细金属掩膜)的精度要求,例如,对于精度为宽度K的FMM(精细金属掩膜),采用其制作现有技术 的阵列基板中的发光层的宽度为K,而当采用其制作本发明实施例中的阵列基板时,可先在第二发光单元200和第三发光单元300中制作宽度为K的第一发光层4(每个发光单元包括K/2宽度的第一发光层),然后在第一发光单元100和第二发光单元200制作宽度为K的第二发光层5(每个发光单元包括K/2宽度的第二发光层),再在第三发光单元300和第四发光单元400中制作宽度为K的第三发光层6(每个发光单元包括K/2宽度的第三发光层),从而使得制作的每个发光单元的宽度更小,进而可以提高OLED显示器件的分辨率。
需要指出的是,在附图中,为了图示的清晰可能夸大了层和区域的尺寸。而且可以理解,当元件或层被称为在另一元件或层“上”时,它可以直接在其他元件上,或者可以存在中间的层。另外,可以理解,当元件或层被称为在另一元件或层“下”时,它可以直接在其他元件下,或者可以存在一个以上的中间的层或元件。另外,还可以理解,当层或元件被称为在两层或两个元件“之间”时,它可以为两层或两个元件之间惟一的层,或还可以存在一个以上的中间层或元件。通篇相似的参考标记指示相似的元件。
此外,本发明实施方式还提供了一种显示装置,包括上述的阵列基板。本发明实施方式提供的显示装置可以是笔记本电脑显示屏、液晶显示器、液晶电视、数码相框、手机、平板电脑等任何具有显示功能的产品或部件。
此外,本发明的实施例还提供了一种上述的阵列基板的制作方法,所述阵列基板包括衬底基板1、以及形成在所述衬底基板1上呈周期性排布的第一发光单元100、第二发光单元200、第三发光单元300和第四发光单元400,其中,形成所述第一发光单元100、第二发光单元200、第三发光单元300和第四发光单元400包括:
S1:在所述衬底基板1上对应于所述第一发光单元100、第二发光单元200、第三发光单元300和第四发光单元400的位置处形成第一电极2:
S2:在形成有所述第一电极2的所述衬底基板1上,在对应于所述第二发光单元200和所述第三发光单元300的位置处形成第一发光层4;
S3:在形成有所述第一发光层4的所述衬底基板1上,在对应于所述第一发光单元100和第二发光单元200的位置处形成第二发光层5,在所述第二发光单元200中所述第二发光层5部分地叠置在第一发光层4上;
S4:在形成有所述第二发光层5的所述衬底基板1上,在对应于所述第三发光单元300和第四发光单元400的位置处形成第三发光层6,在所述第三发光单元300 中所述第三发光层6部分地叠置在第一发光层4上;
S5:在形成有所述第三发光层6的所述衬底基板1上,在对应于所述第一发光单元100、第二发光单元200、第三发光单元300和第四发光单元400的位置处形成第二电极3。
此外,所述阵列基板的制作方法还包括:在具有相同发光层且均发光的两个发光单元中的一个发光单元中,形成位于出光侧的光色转换层7。
优选地,在上述的阵列基板的制作方法中,除形成发光层外,还可以形成电子功能层9和空穴功能层8,其中,电子功能层9包括电子传输层和电子注入层中的至少一种,空穴功能层8包括空穴传输层和空穴注入层中的至少一种,且空穴功能层8形成在阳极与发光层之间,电子功能层9形成在阴极与发光层之间。
优选地,在形成所述第一发光层4之后,在形成所述第二发光层5之前还包括:
在所述第二发光单元200和所述第三发光单元300的位置处形成阻挡层10,所述阻挡层10用于在同一个发光单元中,阻挡注入到其中一个发光层的电子或空穴注入到另一个发光层。
其中,第二发光单元200与第三发光单元300中的阻挡层10可以为相同类型,即都为电子阻挡层或者都为空穴阻挡层,且该阻挡层10使所述第二发光单元200中和所述第三发光单元300中均为第一发光层4发光,即第二发光单元200和第三发光单元300中的阻挡层10可以在一次构图工艺中同时形成,在此情况下,所述形成位于出光侧的光色转换层7包括:
在所述第二发光单元200或所述第三发光单元300的出光侧形成所述光色转换层7。
例如,在使用精度为宽度K的FMM(精细金属掩膜)制作发光层时,可先在第二发光单元200和第三发光单元300中制作宽度为K的第一发光层4(每个发光单元包括K/2宽度的第一发光层),然后在第一发光单元100和第二发光单元200制作宽度为K的第二发光层5(每个发光单元包括K/2宽度的第二发光层),再在第三发光单元300和第四发光单元400中制作宽度为K的第三发光层6(每个发光单元包括K/2宽度的第三发光层),从而使得每个发光单元均包括K/2宽度的发光层。相比现有技术,本发明制作的每个发光单元的宽度更小,进而可以提高OLED显示器件的分辨率。此外,对于光色转换层7,当每个发光层的宽度为K/2时,其宽度也需为 K/2,因此,制作光色转换层可采用制作分辨率更高的光刻技术。
在本发明实施方式提供的阵列基板制作方法中,可通过采用不同的发光材料,使得制作的第一发光层4、第二发光层5以及第三发光层6发出的光各不相同,并通过制作光色转换层7转换其中任一个发光层发出的光从而可以实现四像素型OLED显示器件,例如,由于绿光和蓝光的能量高于红光的能量,因此,将绿光和蓝光转换为红光更为容易,则可使第一发光层4、所述第二发光层5以及所述第三发光层6的发光颜色为绿色、深蓝色、浅蓝色中的任一种,且三个发光层的发光颜色各不相同,通过光色转换层将绿色或深蓝色或浅蓝色转换为红色,从而实现绿、深蓝、浅蓝、红四像素型OLED显示器件。
优选地,当第二发光单元200和第三发光单元300中均为第一发光层4发光时,则光色转换层7形成在第二发光单元200或者第三发光单元300的出光侧,由于一般情况下绿色发光材料的发光效率高于蓝色发光材料,优选地,可以使第一发光层4的发光颜色为绿色,第二发光层5和第三发光层6中一个发光颜色为深蓝,另一个发光颜色为浅蓝色,并使光色转换层7将第一发光层4的绿光转换为红光,从而实现发光效率更高的绿、深蓝、浅蓝、红四像素型OLED显示器件。
以上实施方式仅用于说明本发明,而并非对本发明的限制,有关技术领域的普通技术人员,在不脱离本发明的精神和范围的情况下,还可以做出各种变化和变型,因此所有等同的技术方案也属于本发明的范畴,本发明的专利保护范围应由权利要求限定。

Claims (20)

  1. 一种阵列基板,包括:
    衬底基板;和
    设置在衬底基板上并呈周期性排布的第一发光单元、第二发光单元、第三发光单元和第四发光单元,
    其中,所述第一发光单元、所述第二发光单元、所述第三发光单元和所述第四发光单元中的每个发光单元包括第一电极、第二电极和有机材料功能层,所述有机材料功能层包括发光部,
    其中所述发光部包括位于第二发光单元和第三发光单元中的第一发光层和在第一发光单元和第二发光单元中的第二发光层和在第三发光单元和第四发光单元中的第三发光层;
    所述第一发光层被配置成在所述第二发光单元和所述第三发光单元的至少一个中发光。
  2. 根据权利要求1所述的阵列基板,其中,
    所述第一发光层横跨第二和第三发光单元,在所述第二发光单元中所述第二发光层部分地叠置在第一发光层上,在所述第三发光单元中所述第三发光层部分地叠置在第一发光层上。
  3. 根据权利要求2所述的阵列基板,其中,
    所述第二发光层和第三发光层设置成在第二发光单元和第三发光单元的边界处彼此接触。
  4. 根据权利要求3所述的阵列基板,其中,
    第一发光层、第二发光层和第三发光层均具有第一宽度,
    第一发光层在第二发光单元和第三发光单元中的宽度为第二宽度,第二发光层在第一发光单元和第二发光单元中的宽度为第二宽度,第三发光层在第三发光单元和第四发光单元中的宽度为第一宽度,其中第一宽度为第一宽度的一半。
  5. 根据权利要求1-4中任一项所述的阵列基板,其中,
    所述第二发光单元被配置成仅位于其中的第一发光层和第二发光层中的一个发光,并且第三发光单元被配置成仅位于其中的第一发光层和第三发光层中的一个发 光。
  6. 根据权利要求5所述的阵列基板,其中,
    通过控制第二发光单元中的第一发光层和第二发光层的载流子传输特性和/或二者间的能级关系来使得只有第一发光层和第二发光层中的一个发光;
    通过控制第三发光单元中的第一发光层和第三发光层的载流子传输特性和/或二者间的能级关系来使得只有第一发光层和第三发光层中的一个发光。
  7. 根据权利要求6所述的阵列基板,其中,
    所述第二发光层和第三发光层的载流子特性被配置成有利于空穴传输,使得在第二发光单元和第三发光单元中只有第一发光层发光。
  8. 根据权利要求6所述的阵列基板,其中,
    在第一电极为阴极和第二电极为阳极时,控制第二发光层、第三发光层与第一发光层的最高已占用轨道能级相同或者十分接近,并使第二发光层、第三发光层与第一发光层的最低未占轨道能级相差较大,使得第二发光单元与第三发光单元中只有第一发光层发光。
  9. 根据权利要求5所述的阵列基板,其中,
    所述第二发光单元还包括位于第一发光层与第二发光层之间的阻挡层,所述阻挡层用于在所述第二发光单元中阻挡注入到第一发光层和第二发光层中的一个的电子或空穴注入到它们中的另一个中;和/或
    在所述第三发光单元还包括位于第一发光层与第三发光层之间的阻挡层,所述阻挡层用于在所述第三发光单元中阻挡注入到第一发光层和第三发光层中的一个的电子或空穴注入到它们中的另一个中。
  10. 根据权利要求9所述的阵列基板,其中,
    在第二发光单元和第三发光单元中的阻挡层是一个公共阻挡层。
  11. 根据权利要求10所述的阵列基板,其中,
    所述公共阻挡层使在所述第二发光单元中和所述第三发光单元中均为第一发光层发光,光色转换层设在所述第二发光单元或所述第三发光单元的出光侧。
  12. 根据权利要求11所述的阵列基板,其中,
    所述第一发光层、所述第二发光层以及所述第三发光层的发光颜色为绿色、深蓝色、浅蓝色中的任一种,且它们的发光颜色各不相同,所述光色转换层用于将绿色或深蓝色或浅蓝色转换为红色。
  13. 根据权利要求12所述的阵列基板,其中,
    所述第一发光层的发光颜色为绿色,所述第二发光层和所述第三发光层中一个发光颜色为深蓝且另一个发光颜色为浅蓝色。
  14. 根据权利要求1-13中任一项所述的阵列基板,其中,
    当第二发光层在第一和第二发光单元中同时发光时,在第一和第二发光单元中的一个发光单元的出光侧设置光色转换层;或
    当第一发光层在第二和第三发光单元中同时发光时,在第二和第三发光单元中的一个发光单元的出光侧设置光色转换层;或
    当第三发光层在第三和第四发光单元中同时发光时,在第三和第四发光单元中的一个发光单元的出光侧设置光色转换层。
  15. 根据权利要求1-14任一项所述的阵列基板,其中,
    所述第一电极与所述第二电极中一个为阳极则另一个为阴极。
  16. 根据权利要求15所述的阵列基板,其中,
    所述有机材料功能层还包括位于所述发光层与阳极之间的空穴功能层以及位于所述发光层与所述阴极之间的电子功能层。
  17. 根据权利要求15所述的阵列基板,其中,
    所述第一电极与所述第二电极中至少一个为透明电极,所述光色转换层设置在所述透明电极或衬底基板远离所述发光层的一侧。
  18. 根据权利要求17所述的阵列基板,其中,
    所述第一和第二电极中的一个设置成多个且彼此分离的形式,而另一个电极设置成公共电极的形式。
  19. 一种显示装置,包括根据权利要求1-18中任一项所述的阵列基板。
  20. 一种根据权利要求1-18中任一项所述的阵列基板的制作方法,所述包括以下步骤:
    在所述衬底基板上对应于所述第一发光单元、第二发光单元、第三发光单元和第四发光单元的位置处形成第一电极:
    在形成有所述第一电极的所述衬底基板上,在对应于所述第二发光单元和所述第三发光单元的位置处形成第一发光层;
    在形成有所述第一发光层的所述衬底基板上,在对应于所述第一发光单元和第二发光单元的位置处形成第二发光层,在所述第二发光单元中所述第二发光层部分地 叠置在所述第一发光层上;
    在形成有所述第二发光层的所述衬底基板上,在对应于所述第三发光单元和第四发光单元的位置处形成第三发光层,在所述第三发光单元中所述第三发光层部分地叠置在所述第一发光层上;
    在形成有所述第三发光层的所述衬底基板上,在对应于所述第一发光单元、第二发光单元、第三发光单元和第四发光单元的位置处形成第二电极。
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