CN111508994A - Organic light-emitting display panel, preparation method thereof and display device - Google Patents
Organic light-emitting display panel, preparation method thereof and display device Download PDFInfo
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- CN111508994A CN111508994A CN201911127522.7A CN201911127522A CN111508994A CN 111508994 A CN111508994 A CN 111508994A CN 201911127522 A CN201911127522 A CN 201911127522A CN 111508994 A CN111508994 A CN 111508994A
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs 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
- H10K50/131—OLEDs 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
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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Abstract
The invention discloses an organic light-emitting display panel, a preparation method thereof and a display device, on one hand, the area for manufacturing a blue light-emitting unit can be saved, and the pixel resolution is improved; on the other hand, the red color film layer is arranged in the light emitting direction of the first sub-pixel, the green color film layer is arranged in the light emitting direction of the second sub-pixel, and the blue color film layer is simultaneously arranged in the light emitting direction of the first sub-pixel and the light emitting direction of the second sub-pixel, so that when emitting red light, only the red light emitting unit in the first sub-pixel needs to be driven to emit light, when emitting green light, only the blue light emitting unit in the first sub-pixel or the second sub-pixel needs to be driven to emit light, and when the existing white light device and color film layer structure wants to emit light of a single color, the red, green and blue sub-pixels need to be simultaneously driven to emit light simultaneously to be mixed into white light, and then the light of the corresponding color is emitted through the color film layers of the corresponding colors, so that the power consumption can be reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light-emitting display panel, a preparation method thereof and a display device.
Background
Organic light Emitting diodes (Organic L light Emitting Diode, O L ED) are one of the hot spots in the research field of current flat panel displays, and compared with liquid Crystal displays (L liquid Crystal displays, L CD), O L ED displays have the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, and the like.
Disclosure of Invention
The embodiment of the invention provides an organic light-emitting display panel, a preparation method thereof and a display device, which are used for improving the resolution and the service life of a large-size organic light-emitting display panel and reducing the power consumption.
Therefore, an embodiment of the present invention provides an organic light emitting display panel, including a plurality of pixel units distributed in an array, each of the pixel units including a first sub-pixel and a second sub-pixel; the first sub-pixel and the second sub-pixel respectively comprise an anode which is independently arranged on a substrate and a cathode which is arranged on the whole surface opposite to the anode;
the first sub-pixel further comprises a red light emitting unit, a first charge generation layer and a first blue light emitting unit which are sequentially stacked and arranged between the anode and the cathode; the red light emitting unit is close to the anode, and the first blue light emitting unit is close to the cathode;
the second sub-pixel also comprises a green light-emitting unit, a second charge generation layer and a second blue light-emitting unit which are sequentially stacked and arranged between the anode and the cathode; the green light emitting unit is adjacent to the anode, and the second blue light emitting unit is adjacent to the cathode.
Optionally, in a specific implementation, in the organic light emitting display panel provided in the embodiment of the present invention, each of the pixel units further includes a third sub-pixel; the third sub-pixel comprises an anode independently arranged on the substrate base plate and a cathode arranged on the whole surface opposite to the anode;
the third sub-pixel further comprises a third blue light-emitting unit, a third charge generation layer and a fourth blue light-emitting unit which are sequentially stacked and arranged between the anode and the cathode; the third blue light emitting unit is adjacent to the anode, and the fourth blue light emitting unit is adjacent to the cathode.
Optionally, in a specific implementation, the organic light emitting display panel provided in the embodiment of the present invention further includes a red color film layer, a green color film layer, and a blue color film layer located in the light emitting direction of the pixel unit; the red color film layer and the first sub-pixel have an overlapping area, the green color film layer and the second sub-pixel have an overlapping area, and the blue color film layer and the first and second sub-pixels have an overlapping area.
Optionally, in a specific implementation manner, in the organic light emitting display panel provided in the embodiment of the present invention, the first charge generation layer, the second charge generation layer, and the third charge generation layer are an integrated structure.
Optionally, in a specific implementation manner, in the organic light emitting display panel provided in the embodiment of the present invention, the red light emitting unit includes a first hole injection layer, a first hole transport layer, a red organic light emitting layer, a first electron transport layer, and a first electron injection layer, which are stacked between the anode and the first charge generation layer; the first hole injection layer is in contact with the anode, and the first electron injection layer is in contact with the first charge generation layer;
the green light-emitting unit comprises a second hole injection layer, a second hole transport layer, a green organic light-emitting layer, a second electron transport layer and a second electron injection layer which are arranged between the anode and the second charge generation layer in a stacked mode; the second hole injection layer is in contact with the anode, and the second electron injection layer is in contact with the second charge generation layer;
the third blue light-emitting unit comprises a third hole injection layer, a third hole transport layer, a first blue organic light-emitting layer, a third electron transport layer and a third electron injection layer which are positioned between the anode and the third charge generation layer in a laminated manner; the third hole injection layer is in contact with the anode, and the third electron injection layer is in contact with the third charge generation layer;
the first hole injection layer, the second hole injection layer and the third hole injection layer are independently arranged;
the first hole transport layer, the second hole transport layer and the third hole transport layer are independently disposed;
the red organic light emitting layer, the green organic light emitting layer and the first blue organic light emitting layer are independently arranged;
the first electron transport layer, the second electron transport layer and the third electron transport layer are of an integrated structure;
the first electron injection layer, the second electron injection layer and the third electron injection layer are of an integral structure.
Optionally, in specific implementation, in the above organic light-emitting display panel provided in this embodiment of the present invention, the first blue light-emitting unit includes a fourth hole injection layer, a fourth hole transport layer, a second blue organic light-emitting layer, a fourth electron transport layer, and a fourth electron injection layer, which are stacked between the cathode and the first charge generation layer; the fourth hole injection layer is in contact with the first charge generation layer, and the fourth electron injection layer is in contact with the cathode;
the second blue light-emitting unit comprises a fifth hole injection layer, a fifth hole transport layer, a third blue organic light-emitting layer, a fifth electron transport layer and a fifth electron injection layer which are positioned between the cathode and the second charge generation layer in a laminated manner; the fifth hole injection layer is in contact with the second charge generation layer, and the fifth electron injection layer is in contact with the cathode;
the fourth blue light-emitting unit comprises a sixth hole injection layer, a sixth hole transport layer, a fourth blue organic light-emitting layer, a sixth electron transport layer and a sixth electron injection layer which are positioned between the cathode and the third charge generation layer in a stacked mode; the sixth hole injection layer is in contact with the third charge generation layer, and the sixth electron injection layer is in contact with the cathode;
the fourth hole injection layer, the fifth hole injection layer and the sixth hole injection layer are of an integrated structure;
the fourth hole transport layer, the fifth hole transport layer and the sixth hole transport layer are of an integrated structure;
the second blue organic light-emitting layer, the third blue organic light-emitting layer and the fourth blue organic light-emitting layer are of an integrated structure;
the fourth electron transport layer, the fifth electron transport layer and the sixth electron transport layer are of an integrated structure;
the fourth electron injection layer, the fifth electron injection layer and the sixth electron injection layer are of an integral structure.
Correspondingly, the embodiment of the invention also provides a display device which comprises the organic light-emitting display panel provided by the embodiment of the invention.
Correspondingly, an embodiment of the present invention further provides a method for manufacturing the organic light emitting display panel, including:
forming anodes independently arranged on the substrate at first sub-pixels and second sub-pixels in a plurality of pixel units distributed in an array;
forming a red light emitting unit, a first charge generation layer and a first blue light emitting unit on the anode in sequence;
forming a green light emitting unit, a second charge generation layer and a second blue light emitting unit on the anode in sequence in the second sub-pixel;
and forming cathodes arranged on the whole surface in the first sub-pixel and the second sub-pixel in a plurality of pixel units distributed in an array.
Optionally, in specific implementation, in the above preparation method provided by an embodiment of the present invention, an inkjet printing process is used to form the first hole injection layer, the first hole transport layer, and the red organic light emitting layer in the red light emitting unit, an inkjet printing process is used to form the second hole injection layer, the second hole transport layer, and the green organic light emitting layer in the green light emitting unit, and an inkjet printing process is used to form the third hole injection layer, the third hole transport layer, and the first blue organic light emitting layer in the third blue light emitting unit.
Optionally, in specific implementation, in the above preparation method provided in an embodiment of the present invention, a vacuum evaporation process is used to form the first electron transport layer and the first electron injection layer in the red light emitting unit, a vacuum evaporation process is used to form the second electron transport layer and the second electron injection layer in the green light emitting unit, and a vacuum evaporation process is used to form the third electron transport layer and the third electron injection layer in the third blue light emitting unit;
and forming each film layer in the first blue light-emitting unit, the second blue light-emitting unit and the fourth blue light-emitting unit by adopting a vacuum evaporation process.
The embodiment of the invention has the beneficial effects that:
according to the organic light-emitting display panel, the preparation method thereof and the display device provided by the embodiment of the invention, the first sub-pixel and the second sub-pixel are arranged in each pixel unit, the first sub-pixel comprises a red light-emitting unit and a first blue light-emitting unit which are arranged in series through a first charge generation layer, and the second sub-pixel comprises a green light-emitting unit and a second blue light-emitting unit which are arranged in series through a second charge generation layer; on one hand, the area for manufacturing the blue light-emitting unit can be saved, the pixel resolution is improved by 50%, and the light-emitting brightness and the efficiency of the device can be improved; on the other hand, the organic light emitting display panel provided by the present invention can be obtained by disposing the red color film layer in the light emitting direction of the first sub-pixel, disposing the green color film layer in the light emitting direction of the second sub-pixel, and disposing the blue color film layer in the light emitting direction of the first sub-pixel and the second sub-pixel simultaneously, so that when red light is required, only the red light emitting unit in the first sub-pixel needs to be driven to emit light, when green light is required, only the green light emitting unit in the second sub-pixel needs to be driven to emit light, and when blue light is required, only the blue light emitting unit in the first sub-pixel or the second sub-pixel needs to be driven to emit light, and if the organic light emitting display panel of the existing white light emitting device + color film layer wants to emit light of a single color, the red, green, and blue sub-pixels need to be simultaneously driven to emit light to be mixed into white light, and then the color film layer of the corresponding color, the organic light emitting display panel provided by the invention can reduce power consumption.
Drawings
Fig. 1 is a schematic view of a pixel structure of an organic light emitting display panel according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a first sub-pixel in an organic light emitting display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second sub-pixel in an organic light emitting display panel according to an embodiment of the present invention;
fig. 4 is a second schematic view illustrating a pixel structure of an organic light emitting display panel according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a third sub-pixel in an organic light emitting display panel according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a pixel unit in the pixel structural diagram shown in FIG. 1;
FIG. 7 is a schematic structural diagram of a pixel unit in the pixel structural diagram shown in FIG. 4;
FIG. 8 is a schematic structural diagram of the first sub-pixel shown in FIG. 2;
FIG. 9 is a schematic diagram of a specific structure of the second sub-pixel shown in FIG. 3;
FIG. 10 is a schematic structural diagram of the third sub-pixel shown in FIG. 5;
fig. 11 is a flowchart of a method for manufacturing an organic light emitting display panel according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of an organic light emitting display panel, a method for manufacturing the same, and a display device according to embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The thicknesses and shapes of the respective layers in the drawings do not reflect the true proportions of the organic light emitting display panel, and are only intended to schematically illustrate the present invention.
As shown in fig. 1, the organic light emitting display panel provided in the embodiment of the present invention includes a plurality of pixel units P distributed in an array, where each pixel unit P includes a first sub-pixel 1 and a second sub-pixel 2; as shown in fig. 2 and 3, each of the first and second sub-pixels 1 and 2 includes an anode 10 independently disposed on a substrate (not shown), and a cathode 20 disposed opposite to the anode 10 over the entire surface; in specific implementation, the anodes 10 in all the first sub-pixels 1 and the second sub-pixels 2 are independently arranged, and the cathodes 20 in all the first sub-pixels 1 and the second sub-pixels 2 are arranged on the whole surface;
as shown in fig. 2, the first sub-pixel 1 further includes a red light emitting unit 11, a first charge generation layer 12, and a first blue light emitting unit 13, which are sequentially stacked between the anode 10 and the cathode 20; the red light emitting unit 11 is adjacent to the anode 10, and the first blue light emitting unit 13 is adjacent to the cathode 20;
as shown in fig. 3, the second sub-pixel 2 further includes a green light emitting unit 21, a second charge generation layer 22, and a second blue light emitting unit 23, which are sequentially stacked between the anode 10 and the cathode 20; the green light emitting unit 21 is adjacent to the anode 10 and the second blue light emitting unit 23 is adjacent to the cathode 20.
In the organic light emitting display panel provided by the embodiment of the present invention, by disposing the first sub-pixel 1 and the second sub-pixel 2 in each pixel unit P, the first sub-pixel 1 includes the red light emitting unit 11 and the first blue light emitting unit 13 which are disposed in series through the first charge generation layer 12, and the second sub-pixel 2 includes the green light emitting unit 21 and the second blue light emitting unit 23 which are disposed in series through the second charge generation layer 22; on one hand, the area for manufacturing the blue light-emitting unit can be saved, the pixel resolution is improved by 50%, and the light-emitting brightness and the efficiency of the device can be improved; on the other hand, the organic light emitting display panel provided by the present invention can be obtained by disposing a red color film layer (described later) in the light emitting direction of the first sub-pixel 1, disposing a green color film layer (described later) in the light emitting direction of the second sub-pixel 2, and disposing a blue color film layer (described later) in the light emitting directions of the first sub-pixel 1 and the second sub-pixel 2 simultaneously, such that when red light is required, only the red light emitting unit in the first sub-pixel 1 needs to be driven to emit light 11, when green light is required, only the green light emitting unit in the second sub-pixel 2 needs to be driven to emit light 21, when blue light is required, only the blue light emitting unit in the first sub-pixel 1 or the second sub-pixel 2 needs to be driven to emit light, and if the existing organic light emitting display panel of the white light device and the color film layer wants to emit light of a single color, three sub-pixels, and then, the light with the corresponding color is emitted through the color film layer with the corresponding color, so that compared with the conventional organic light-emitting display panel with the white light device and the color film layer, the organic light-emitting display panel provided by the invention can reduce the power consumption.
In the conventional organic light emitting display panel, the light emitting lifetime of the blue light emitting unit is the shortest, so the light emitting lifetime of the blue light emitting unit directly affects the light emitting lifetime of the organic light emitting display panel, and in order to improve the light emitting lifetime of the organic light emitting display panel, it is necessary to improve the light emitting lifetime of the blue light emitting unit, so in the specific implementation, as shown in fig. 4, each pixel unit P further includes a third sub-pixel 3; as shown in fig. 5, the third sub-pixel 3 includes an anode electrode 10 independently provided on a substrate, and a cathode electrode 20 provided on the entire surface opposite to the anode electrode 10;
the third sub-pixel 3 further includes a third blue light emitting unit 31, a third charge generation layer 32, and a fourth blue light emitting unit 33, which are sequentially stacked between the anode 10 and the cathode 20; the third blue light emitting unit 31 is adjacent to the anode 10 and the fourth blue light emitting unit 33 is adjacent to the cathode 20. On one hand, the light-emitting area of the blue light-emitting unit can be increased by adding the blue light-emitting unit in each pixel unit P, so that the current density of the blue light-emitting unit can be relatively reduced while the same light-emitting brightness is achieved, and the light-emitting life of the blue light-emitting unit is prolonged; on the other hand, the blue light emitting unit is configured as a stacked composite structure in which the third blue light emitting unit 31, the third charge generation layer 32 and the fourth blue light emitting unit 33 are connected in series, and under the condition that the brightness required by the whole blue light emitting unit composite structure is constant, the brightness required by each single blue light emitting unit in the stacked blue light emitting unit composite structure is much smaller, so that the voltage required to be applied to the single blue light emitting unit (31 or 33) and the current density passing through the single blue light emitting unit are much smaller, and finally the attenuation of the blue light material in each single blue light emitting unit is much slower, so that the problem that the blue light is attenuated more quickly in the whole organic light emitting display panel can be effectively solved, and the light emitting life and the light emitting efficiency of the blue light emitting device can be improved.
Further, in a specific implementation, as shown in fig. 6 and 7, in the organic light emitting display panel provided in the embodiment of the present invention, fig. 6 is a schematic structural diagram when each pixel unit P only includes the first sub-pixel 1 and the second sub-pixel 2, fig. 7 is a schematic structural diagram when each pixel unit P includes the first sub-pixel 1, the second sub-pixel 2, and the third sub-pixel 3, and in order to implement full-color display, the organic light emitting display panel further includes a red color film layer 4, a green color film layer 5, and a blue color film layer 6 located in a light emitting direction of the pixel unit P; the red color film layer 4 and the first sub-pixel 1 have an overlapping area, the green color film layer 5 and the second sub-pixel 2 have an overlapping area, and the blue color film layer 6 and the first sub-pixel 1 and the second sub-pixel 2 have an overlapping area. Because the first sub-pixel 1 is a double-stack structure of the red light emitting unit 11 and the first blue light emitting unit 13, red light and blue light can be emitted, the red color film layer 4 is arranged in the light emitting direction of the first sub-pixel 1, namely, the final light emitting is red light, and the blue color film layer 6 is arranged in the light emitting direction of the first sub-pixel 1, namely, the final light emitting is blue light; the second sub-pixel 2 is a double-stack structure of the green light emitting unit 21 and the second blue light emitting unit 23, and can emit green light and blue light, the green color film layer 5 is arranged in the light emitting direction of the second sub-pixel 2, namely, the final light emitting is green light, and the blue color film layer 6 is arranged in the light emitting direction of the second sub-pixel 2, namely, the final light emitting is blue light, so that full-color display of the display panel is realized; when the red light is required to be emitted, only the red light-emitting unit in the first sub-pixel 1 needs to be driven to emit light 11, when the green light is required to be emitted, only the green light-emitting unit in the second sub-pixel 2 needs to be driven to emit light 21, when the blue light is required to be emitted, only the blue light-emitting unit in the first sub-pixel 1 or the second sub-pixel 2 needs to be driven to emit light, and if the existing white light device + color film layer organic light-emitting display panel wants to emit light of a single color, the red, green and blue sub-pixels need to be simultaneously driven to simultaneously emit light to be mixed into white light, and then the light of a corresponding color is emitted through the color film layer of the corresponding color, so that compared with the existing white light device + color film layer organic light-emitting display panel. In the structure shown in fig. 7, the light-emitting direction of the third sub-pixel 3 is not provided with a color film layer, so that the third sub-pixel 3 can be controlled to emit blue light, and the light-emitting life of the blue light-emitting unit can be prolonged.
Further, in a specific implementation, in the organic light emitting display panel provided in the embodiment of the present invention, the first charge generation layer, the second charge generation layer, and the third charge generation layer are integrated, that is, the first charge generation layer, the second charge generation layer, and the third charge generation layer are disposed on the whole surface and are shared by the first sub-pixel, the second sub-pixel, and the third sub-pixel, so that the manufacturing process can be simplified.
Further, in practical implementation, in the above organic light emitting display panel provided in the embodiment of the present invention, as shown in fig. 8, the red light emitting unit 11 includes a first hole injection layer 111, a first hole transport layer 112, a red organic light emitting layer 113, a first electron transport layer 114, and a first electron injection layer 115, which are stacked between the anode 10 and the first charge generation layer 12; the first hole injection layer 111 is in contact with the anode 10, and the first electron injection layer 115 is in contact with the first charge generation layer 12;
as shown in fig. 9, the green light-emitting unit 21 includes a second hole injection layer 211, a second hole transport layer 212, a green organic light-emitting layer 213, a second electron transport layer 214, and a second electron injection layer 215, which are stacked between the anode 10 and the second charge generation layer 22; the second hole injection layer 211 is in contact with the anode 10, and the second electron injection layer 215 is in contact with the second charge generation layer 22;
as shown in fig. 10, the third blue light emitting unit 31 includes a third hole injection layer 311, a third hole transport layer 312, a first blue organic light emitting layer 313, a third electron transport layer 314, and a third electron injection layer 315, which are stacked between the anode 10 and the third charge generation layer 32; the third hole injection layer 311 is in contact with the anode 10, and the third electron injection layer 315 is in contact with the third charge generation layer 32;
the first hole injection layer 111, the second hole injection layer 211 and the third hole injection layer 311 are independently arranged, so that the thicknesses of the first hole injection layer 111, the second hole injection layer 211 and the third hole injection layer 311 can be independently regulated and controlled to optimize the device performance of the organic light-emitting display panel;
the first hole transport layer 112, the second hole transport layer 212 and the third hole transport layer 312 are independently arranged, so that the thicknesses of the first hole transport layer 112, the second hole transport layer 212 and the third hole transport layer 312 can be independently regulated and controlled to optimize the device performance of the organic light-emitting display panel;
the red organic light emitting layer 113, the green organic light emitting layer 213 and the first blue organic light emitting layer 313 are independently arranged, so that the thicknesses of the red organic light emitting layer 113, the green organic light emitting layer 213 and the first blue organic light emitting layer 313 can be independently regulated and controlled to optimize the light emitting performance of the organic light emitting display panel;
the first electron transport layer 114, the second electron transport layer 214 and the third electron transport layer 314 are of an integral structure, that is, the first electron transport layer 114, the second electron transport layer 214 and the third electron transport layer 314 are of a structure arranged on the whole surface and are shared by the first sub-pixel, the second sub-pixel and the third sub-pixel, so that the manufacturing process can be simplified;
the first electron injection layer 115, the second electron injection layer 215, and the third electron injection layer 315 are integrated, that is, the first electron injection layer 115, the second electron injection layer 215, and the third electron injection layer 315 are disposed on the whole surface and are shared by the first sub-pixel, the second sub-pixel, and the third sub-pixel, so that the manufacturing process can be simplified.
Further, in practical implementation, in the above organic light emitting display panel provided in the embodiment of the present invention, as shown in fig. 8, the first blue light emitting unit 13 includes a fourth hole injection layer 131, a fourth hole transport layer 132, a second blue organic light emitting layer 133, a fourth electron transport layer 134, and a fourth electron injection layer 135, which are stacked between the cathode 20 and the first charge generation layer 12; the fourth hole injection layer 131 is in contact with the first charge generation layer 12, and the fourth electron injection layer 135 is in contact with the cathode 20;
as shown in fig. 9, the second blue light emitting unit 23 includes a fifth hole injection layer 231, a fifth hole transport layer 232, a third blue organic light emitting layer 233, a fifth electron transport layer 234, and a fifth electron injection layer 235, which are stacked between the cathode 20 and the second charge generation layer 22; the fifth hole injection layer 231 contacts the second charge generation layer 22, and the fifth electron injection layer 235 contacts the cathode 20;
as shown in fig. 10, the fourth blue light emitting unit 33 includes a sixth hole injection layer 331, a sixth hole transport layer 332, a fourth blue organic light emitting layer 333, a sixth electron transport layer 334, and a sixth electron injection layer 335, which are stacked between the cathode 20 and the third charge generation layer 32; the sixth hole injection layer 331 is in contact with the third charge generation layer 32, and the sixth electron injection layer 335 is in contact with the cathode 20;
the fourth hole injection layer 131, the fifth hole injection layer 231 and the sixth hole injection layer 331 are of an integral structure, that is, the fourth hole injection layer 131, the fifth hole injection layer 231 and the sixth hole injection layer 331 are of a structure arranged on the whole surface and are shared by the first sub-pixel, the second sub-pixel and the third sub-pixel, so that the manufacturing process can be simplified;
the fourth hole transport layer 132, the fifth hole transport layer 232 and the sixth hole transport layer 332 are of an integral structure, that is, the fourth hole transport layer 132, the fifth hole transport layer 232 and the sixth hole transport layer 332 are of a structure arranged on the whole surface and shared by the first sub-pixel, the second sub-pixel and the third sub-pixel, so that the manufacturing process can be simplified;
the second blue organic light emitting layer 133, the third blue organic light emitting layer 233 and the fourth blue organic light emitting layer 333 are of an integrated structure, that is, the second blue organic light emitting layer 133, the third blue organic light emitting layer 233 and the fourth blue organic light emitting layer 333 are of a structure arranged on the whole surface and shared by the first sub-pixel, the second sub-pixel and the third sub-pixel, so that the manufacturing process can be simplified;
the fourth electron transport layer 134, the fifth electron transport layer 234 and the sixth electron transport layer 334 are of an integral structure, that is, the fourth electron transport layer 134, the fifth electron transport layer 234 and the sixth electron transport layer 334 are of a structure arranged on the whole surface and are shared by the first sub-pixel, the second sub-pixel and the third sub-pixel, so that the manufacturing process can be simplified;
the fourth electron injection layer 135, the fifth electron injection layer 235 and the sixth electron injection layer 335 are integrated, that is, the fourth electron injection layer 135, the fifth electron injection layer 235 and the sixth electron injection layer 335 are arranged on the whole surface and are shared by the first sub-pixel, the second sub-pixel and the third sub-pixel, so that the manufacturing process can be simplified.
Based on the same inventive concept, an embodiment of the present invention further provides a method for manufacturing the organic light emitting display panel, as shown in fig. 11, including:
s1101, forming anodes independently arranged on a substrate in a first sub-pixel and a second sub-pixel in a plurality of pixel units distributed in an array;
s1102, forming a red light emitting unit, a first charge generation layer and a first blue light emitting unit which are sequentially stacked on the anode in the first sub-pixel;
s1103, forming a green light emitting unit, a second charge generation layer, and a second blue light emitting unit, which are sequentially stacked on the anode, in the second subpixel;
and S1104, forming cathodes arranged on the whole surface in the first sub-pixel and the second sub-pixel in the plurality of pixel units distributed in the array.
At present, the organic electroluminescent device (O L ED) film deposition method mainly adopts two types of vacuum evaporation and solution process, for the vacuum evaporation technology, the size of a metal mask plate (FFM) is limited, the large-size O L ED display can only be prepared by adopting a WO L ED/CF mode, the advantage is that the high-resolution large-size O L ED display can be prepared, the disadvantage is high power consumption, for the ink jet printing process, the ink drop volume and the equipment precision of ink jet printing are limited, and the high-resolution display is difficult to realize.
In specific implementation, because the organic light emitting display panel provided by the embodiment of the invention is mainly applied to a large-sized O L ED display device and is limited by the size of a metal mask (FFM), and because a first hole injection layer in a red light emitting unit, a second hole injection layer in a green light emitting unit, and a third hole injection layer in a third blue light emitting unit need to be independently disposed, a first hole transport layer in the red light emitting unit, a second hole transport layer in the green light emitting unit, and a third hole transport layer in the third blue light emitting unit need to be independently disposed, a red organic light emitting layer in the red light emitting unit, a green organic light emitting layer in the green light emitting unit, and a first blue organic light emitting layer in the third blue light emitting unit need to be independently disposed, a first hole injection layer, a first hole transport layer, and a red organic light emitting layer in the red light emitting unit are formed by an inkjet printing process, a second hole injection layer, a second hole transport layer, and a green organic light emitting layer in the green light emitting unit are formed by an inkjet printing process, and a third hole injection layer, a third hole transport layer, a blue organic light emitting layer in the green light emitting unit is formed by an inkjet printing process.
Further, in a specific implementation, in the preparation method provided in the embodiment of the present invention, since the film layers in the second sub-pixel and the third sub-pixel, which have the same functions as the film layers in the first sub-pixel from the first electron transport layer to the fourth electron injection layer, may be an integral structure, the first electron transport layer and the first electron injection layer in the red light emitting unit may be formed by using a vacuum evaporation process, the second electron transport layer and the second electron injection layer in the green light emitting unit may be formed by using a vacuum evaporation process, and the third electron transport layer and the third electron injection layer in the third blue light emitting unit may be formed by using a vacuum evaporation process;
and the film layers in the first blue light-emitting unit, the second blue light-emitting unit and the fourth blue light-emitting unit are formed by adopting a vacuum evaporation process, so that the film layers with the same function in the three sub-pixels can be shared, and the manufacturing process is simplified.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the organic light emitting display panel provided by the embodiment of the invention. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. The principle of the display device to solve the problem is similar to that of the organic light emitting display panel, so the implementation of the display device can be referred to the implementation of the organic light emitting display panel, and repeated details are not repeated herein.
According to the organic light-emitting display panel, the preparation method thereof and the display device provided by the embodiment of the invention, the first sub-pixel and the second sub-pixel are arranged in each pixel unit, the first sub-pixel comprises a red light-emitting unit and a first blue light-emitting unit which are arranged in series through a first charge generation layer, and the second sub-pixel comprises a green light-emitting unit and a second blue light-emitting unit which are arranged in series through a second charge generation layer; on one hand, the area for manufacturing the blue light-emitting unit can be saved, the pixel resolution is improved by 50%, and the light-emitting brightness and the efficiency of the device can be improved; on the other hand, the organic light emitting display panel provided by the present invention can be obtained by disposing the red color film layer in the light emitting direction of the first sub-pixel, disposing the green color film layer in the light emitting direction of the second sub-pixel, and disposing the blue color film layer in the light emitting direction of the first sub-pixel and the second sub-pixel simultaneously, so that when red light is required, only the red light emitting unit in the first sub-pixel needs to be driven to emit light, when green light is required, only the green light emitting unit in the second sub-pixel needs to be driven to emit light, and when blue light is required, only the blue light emitting unit in the first sub-pixel or the second sub-pixel needs to be driven to emit light, and if the organic light emitting display panel of the existing white light emitting device + color film layer wants to emit light of a single color, the red, green, and blue sub-pixels need to be simultaneously driven to emit light to be mixed into white light, and then the color film layer of the corresponding color, the organic light emitting display panel provided by the invention can reduce power consumption.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An organic light-emitting display panel is characterized by comprising a plurality of pixel units distributed in an array, wherein each pixel unit comprises a first sub-pixel and a second sub-pixel; the first sub-pixel and the second sub-pixel respectively comprise an anode which is independently arranged on a substrate and a cathode which is arranged on the whole surface opposite to the anode;
the first sub-pixel further comprises a red light emitting unit, a first charge generation layer and a first blue light emitting unit which are sequentially stacked and arranged between the anode and the cathode; the red light emitting unit is close to the anode, and the first blue light emitting unit is close to the cathode;
the second sub-pixel also comprises a green light-emitting unit, a second charge generation layer and a second blue light-emitting unit which are sequentially stacked and arranged between the anode and the cathode; the green light emitting unit is adjacent to the anode, and the second blue light emitting unit is adjacent to the cathode.
2. The organic light emitting display panel of claim 1, wherein each of the pixel units further comprises a third sub-pixel; the third sub-pixel comprises an anode independently arranged on the substrate base plate and a cathode arranged on the whole surface opposite to the anode;
the third sub-pixel further comprises a third blue light-emitting unit, a third charge generation layer and a fourth blue light-emitting unit which are sequentially stacked and arranged between the anode and the cathode; the third blue light emitting unit is adjacent to the anode, and the fourth blue light emitting unit is adjacent to the cathode.
3. The organic light-emitting display panel according to claim 1 or 2, further comprising a red color film layer, a green color film layer, and a blue color film layer in a light-emitting direction of the pixel unit; the red color film layer and the first sub-pixel have an overlapping area, the green color film layer and the second sub-pixel have an overlapping area, and the blue color film layer and the first and second sub-pixels have an overlapping area.
4. The organic light-emitting display panel according to claim 2, wherein the first charge generation layer, the second charge generation layer, and the third charge generation layer are an integrated structure.
5. The organic light-emitting display panel according to claim 2, wherein the red light-emitting unit comprises a first hole injection layer, a first hole transport layer, a red organic light-emitting layer, a first electron transport layer, a first electron injection layer, and a first charge generation layer, which are stacked between the anode and the first charge generation layer; the first hole injection layer is in contact with the anode, and the first electron injection layer is in contact with the first charge generation layer;
the green light-emitting unit comprises a second hole injection layer, a second hole transport layer, a green organic light-emitting layer, a second electron transport layer and a second electron injection layer which are arranged between the anode and the second charge generation layer in a stacked mode; the second hole injection layer is in contact with the anode, and the second electron injection layer is in contact with the second charge generation layer;
the third blue light-emitting unit comprises a third hole injection layer, a third hole transport layer, a first blue organic light-emitting layer, a third electron transport layer and a third electron injection layer which are positioned between the anode and the third charge generation layer in a laminated manner; the third hole injection layer is in contact with the anode, and the third electron injection layer is in contact with the third charge generation layer;
the first hole injection layer, the second hole injection layer and the third hole injection layer are independently arranged;
the first hole transport layer, the second hole transport layer and the third hole transport layer are independently disposed;
the red organic light emitting layer, the green organic light emitting layer and the first blue organic light emitting layer are independently arranged;
the first electron transport layer, the second electron transport layer and the third electron transport layer are of an integrated structure;
the first electron injection layer, the second electron injection layer and the third electron injection layer are of an integral structure.
6. The organic light-emitting display panel according to claim 2, wherein the first blue light-emitting unit includes a fourth hole injection layer, a fourth hole transport layer, a second blue organic light-emitting layer, a fourth electron transport layer, and a fourth electron injection layer, which are stacked between the cathode and the first charge generation layer; the fourth hole injection layer is in contact with the first charge generation layer, and the fourth electron injection layer is in contact with the cathode;
the second blue light-emitting unit comprises a fifth hole injection layer, a fifth hole transport layer, a third blue organic light-emitting layer, a fifth electron transport layer and a fifth electron injection layer which are positioned between the cathode and the second charge generation layer in a laminated manner; the fifth hole injection layer is in contact with the second charge generation layer, and the fifth electron injection layer is in contact with the cathode;
the fourth blue light-emitting unit comprises a sixth hole injection layer, a sixth hole transport layer, a fourth blue organic light-emitting layer, a sixth electron transport layer and a sixth electron injection layer which are positioned between the cathode and the third charge generation layer in a stacked mode; the sixth hole injection layer is in contact with the third charge generation layer, and the sixth electron injection layer is in contact with the cathode;
the fourth hole injection layer, the fifth hole injection layer and the sixth hole injection layer are of an integrated structure;
the fourth hole transport layer, the fifth hole transport layer and the sixth hole transport layer are of an integrated structure;
the second blue organic light-emitting layer, the third blue organic light-emitting layer and the fourth blue organic light-emitting layer are of an integrated structure;
the fourth electron transport layer, the fifth electron transport layer and the sixth electron transport layer are of an integrated structure;
the fourth electron injection layer, the fifth electron injection layer and the sixth electron injection layer are of an integral structure.
7. A display device comprising the organic light-emitting display panel according to any one of claims 1 to 6.
8. A method of manufacturing an organic light emitting display panel according to any one of claims 1 to 6, comprising:
forming anodes independently arranged on the substrate at first sub-pixels and second sub-pixels in a plurality of pixel units distributed in an array;
forming a red light emitting unit, a first charge generation layer and a first blue light emitting unit on the anode in sequence;
forming a green light emitting unit, a second charge generation layer and a second blue light emitting unit on the anode in sequence in the second sub-pixel;
and forming cathodes arranged on the whole surface in the first sub-pixel and the second sub-pixel in a plurality of pixel units distributed in an array.
9. The method of claim 8, wherein the first hole injection layer, the first hole transport layer, and the red organic emission layer in the red light emitting unit are formed using an inkjet printing process, the second hole injection layer, the second hole transport layer, and the green organic emission layer in the green light emitting unit are formed using an inkjet printing process, and the third hole injection layer, the third hole transport layer, and the first blue organic emission layer in the third blue light emitting unit are formed using an inkjet printing process.
10. The method according to claim 8,
forming a first electron transport layer and a first electron injection layer in the red light-emitting unit by adopting a vacuum evaporation process, forming a second electron transport layer and a second electron injection layer in the green light-emitting unit by adopting the vacuum evaporation process, and forming a third electron transport layer and a third electron injection layer in the third blue light-emitting unit by adopting the vacuum evaporation process;
and forming each film layer in the first blue light-emitting unit, the second blue light-emitting unit and the fourth blue light-emitting unit by adopting a vacuum evaporation process.
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