CN109192753B - OLED display panel and preparation method thereof - Google Patents

OLED display panel and preparation method thereof Download PDF

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CN109192753B
CN109192753B CN201810839917.9A CN201810839917A CN109192753B CN 109192753 B CN109192753 B CN 109192753B CN 201810839917 A CN201810839917 A CN 201810839917A CN 109192753 B CN109192753 B CN 109192753B
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oled display
layer
pixel
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display panel
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CN109192753A (en
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黄辉
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TCL China Star Optoelectronics Technology Co Ltd
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TCL China Star Optoelectronics Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
    • H01L2021/775—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate comprising a plurality of TFTs on a non-semiconducting substrate, e.g. driving circuits for AMLCDs

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention discloses an OLED display panel and a preparation method thereof. The OLED display device comprises an anode layer, an organic light emitting layer and a cathode layer which are sequentially arranged on the TFT substrate. The OLED display device further includes a pixel defining layer defining a plurality of main pixel units and auxiliary sub-pixels corresponding to each of the main pixel units in the OLED display device. The OLED display panel further comprises a cover plate arranged on the OLED display device, a quantum dot layer is arranged on the cover plate corresponding to the auxiliary sub-pixels, and the quantum dot layer emits light after being excited by light rays emitted by the auxiliary sub-pixels and compensates light emitted by the main pixel unit. The chromaticity of the exciting light emitted by the quantum dot layer is higher than that of the organic light emitting layer, so that the OLED display panel can reduce the chromaticity requirement on the main pixel unit, further effectively reduce the attenuation speed of the sub-pixels of the main pixel unit and prolong the service life of the main pixel unit.

Description

OLED display panel and preparation method thereof
Technical Field
The invention relates to the technical field of organic electroluminescence display, in particular to an OLED display panel and a preparation method thereof.
Background
Because the OLED display panel generally uses organic light emitting materials of three primary colors of RGB, and the red organic light emitting material, the green organic light emitting material, and the blue organic light emitting material all have a service life, as the service time of the OLED display panel becomes longer, the organic light emitting materials therein will be attenuated, and the color of the displayed image will gradually be color-shifted. Especially, blue organic light emitting materials have fast decay rate, short service life and low emission chromaticity, so that the OLED display panel is easy to cause the above problems.
Disclosure of Invention
In view of the above, the present invention provides an OLED display panel and a method for manufacturing the same to solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an OLED display panel which comprises a TFT substrate and an OLED display device positioned on the TFT substrate. The OLED display device comprises an anode layer, an organic light emitting layer and a cathode layer which are sequentially arranged on the TFT substrate, and further comprises a pixel limiting layer, wherein the pixel limiting layer limits a plurality of main pixel units and auxiliary sub-pixels corresponding to each main pixel unit in the OLED display device. The OLED display panel further comprises a cover plate arranged on the OLED display device, a quantum dot layer is arranged on the cover plate corresponding to the auxiliary sub-pixels, and the quantum dot layer emits light after being excited by light rays emitted by the auxiliary sub-pixels to compensate light emitted by the main pixel unit.
Preferably, the main pixel unit includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the quantum dot layer emits blue light after being excited by the light emitted from the auxiliary sub-pixel, and compensates the light emitted from the blue sub-pixel.
Preferably, the auxiliary sub-pixel is configured to emit blue light, and the quantum dot layer is configured to emit blue light after being excited by the blue light.
Preferably, the red sub-pixel, the green sub-pixel, the blue sub-pixel and the auxiliary sub-pixel are equal in size.
Preferably, the auxiliary subpixel is disposed adjacent to the blue subpixel.
Preferably, each of the auxiliary sub-pixels is independently controllable.
Preferably, a color filter layer is disposed on the cover plate corresponding to the main pixel unit, and the color filter layer includes a red photoresist corresponding to the red sub-pixel, a green photoresist corresponding to the green sub-pixel, and a blue photoresist corresponding to the blue sub-pixel.
Preferably, the quantum dot layer is a film layer formed by printing an inorganic quantum dot material onto the cover plate through an inkjet printing process.
The invention provides a preparation method of the OLED display panel, which comprises the following steps: s1, providing a TFT substrate, and manufacturing an OLED display device on the TFT substrate, wherein the OLED display device comprises an anode layer, an organic light emitting layer and a cathode layer which are sequentially arranged on the TFT substrate, and further comprises a pixel limiting layer which limits a plurality of main pixel units and auxiliary sub-pixels corresponding to each main pixel unit in the OLED display device; s2, manufacturing a cover plate, wherein a quantum dot layer is arranged on the cover plate corresponding to the auxiliary sub-pixels; and S3, packaging the cover plate on the OLED display device to obtain the OLED display panel.
Preferably, in step S1, the anode layer, the organic light emitting layer and the cathode layer of the OLED display device are fabricated on the TFT substrate by an inkjet printing process; in step S2, the quantum dot layer is fabricated on the cover plate by an inkjet printing process.
According to the OLED display panel and the preparation method thereof, the auxiliary sub-pixels are arranged corresponding to each main pixel unit in the OLED display panel, and the quantum dot layer is excited by light emitted by the auxiliary sub-pixels, so that the light emitted by the quantum dot layer compensates the light emitted by the main pixel unit. The chromaticity of the light emitted by the quantum dot layer is higher than that of the organic light-emitting light under the same condition, so that the color saturation of a display picture can be effectively improved, and the chromaticity requirement required to be met by the light emitted by the main pixel unit is reduced, so that the attenuation speed of the sub-pixels of the main pixel unit can be effectively reduced, and the service life of the sub-pixels is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an OLED display panel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an OLED display device in the OLED display panel;
FIG. 3 is a top view of the OLED display device;
fig. 4 is a top view of a cover plate in the OLED display panel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the drawings are exemplary only, and the invention is not limited to these embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps that are closely related to the solution according to the present invention are shown in the drawings, and other details that are not relevant are omitted.
Referring to fig. 1, the present embodiment provides an OLED display panel including a TFT substrate 3 and an OLED display device 1 on the TFT substrate 3. As shown in fig. 2, the OLED display device 1 includes an anode layer 10b, an organic light emitting layer 10a, and a cathode layer 10c sequentially disposed on the TFT substrate 3, the OLED display device 1 further includes a pixel defining layer 15, and the pixel defining layer 15 defines a plurality of main pixel units 10 and auxiliary sub-pixels 14 corresponding to each of the main pixel units 10 in the OLED display device 1; the OLED display panel further includes a cover plate 2 disposed on the OLED display device 1, and a quantum dot layer 24 is disposed on the cover plate 2 corresponding to the auxiliary sub-pixels 14. The quantum dot layer 24 emits light after being excited by the light emitted from the auxiliary sub-pixel 14, and compensates for the light emitted from the main pixel unit 10.
Quantum dots are nano-scale semiconductors, and are excited to emit light of a specific frequency by applying a certain electric field or optical pressure to the quantum dots. The OLED display panel compensates the light of the main pixel unit 10 with the excitation light emitted from the quantum dot layer 24 by disposing the light excitation quantum dot layer 24 generated by the auxiliary sub-pixel 14. The line width of the excitation light emitted by the quantum dots is generally narrower than that of the light emitted by the organic light-emitting material, so that the chromaticity of the excitation light emitted by the quantum dot layer 24 is higher than that of the organic light-emitting material under the same condition, the color saturation of a display screen can be effectively improved, and the excitation light is used for compensating the light of the main pixel unit 10, so that the chromaticity requirement of the light emitted by the main pixel unit 10, which needs to be met, can be reduced, which is equivalent to reducing the load of the main pixel unit 10, and therefore, the effects of effectively reducing the attenuation speed of the sub-pixels in the main pixel unit 10 and prolonging the service life can be achieved.
Specifically, as shown in fig. 1 and 3, the main pixel unit 10 includes a red sub-pixel 11, a green sub-pixel 12, and a blue sub-pixel 13. The organic light emitting layer 10a includes a red organic light emitting layer 11a corresponding to the red sub-pixel 11, a green organic light emitting layer 12a corresponding to the green sub-pixel 12, a blue organic light emitting layer 13a corresponding to the blue sub-pixel 13, and an auxiliary organic light emitting layer 14a corresponding to the auxiliary sub-pixel 14. In the organic luminescent materials of RGB three primary colors, the blue luminescent material has the fastest decay speed and the shortest service life. Therefore, in the present embodiment, the quantum dot layer 24 emits blue light after being excited by the light emitted from the auxiliary sub-pixel 14, and compensates for the light emitted from the blue sub-pixel 13.
Since the frequency of light emitted from the quantum dot after being excited varies with the change in the size of the quantum dot, the color of light emitted from the quantum dot depends on the size of the quantum dot. Therefore, the quantum dots in the quantum dot layer 24 are set to be within a specific size range, and the quantum dot layer 24 can emit blue light after being excited. In different embodiments, the auxiliary sub-pixel 14 may use different colors of light to de-excite the quantum dot layer 24 to emit blue light. In the present embodiment, the auxiliary organic light emitting layer 14a is configured as a blue organic light emitting layer, that is, the auxiliary sub-pixel 14 is configured to emit blue light, and the quantum dot layer 24 is configured to emit blue light after being excited by the blue light. If there is some blue light in the blue light emitted from the auxiliary sub-pixel 14 to penetrate through the quantum dot layer 24, this part of blue light can also be directly used to compensate the blue light emitted from the blue sub-pixel 13.
Generally, the sub-pixels of the OLED display panel are manufactured by evaporation or inkjet printing, and if the auxiliary sub-pixels 14 are set to have the same size as the sub-pixels in the main pixel unit 10, the manufacturing difficulty can be reduced, and the production cost can be saved. For example, when an ink-jet printing process is adopted, the influence on the stability and the adjustability of the spray head due to the inconsistent size of sprayed sub-pixels can be avoided; when the evaporation process is adopted, photomasks with different sizes do not need to be prepared, and the requirement on the fineness of the photomask preparation is reduced. Therefore, in the present embodiment, referring to fig. 1 and fig. 2, the red sub-pixel 11, the green sub-pixel 12, the blue sub-pixel 13 and the auxiliary sub-pixel 14 have the same size.
Illustratively, the auxiliary sub-pixel 14 is disposed adjacent to the blue sub-pixel 13.
Further, each of the auxiliary sub-pixels 14 can be independently controlled. When the OLED display panel displays, the main pixel units 10 requiring optical compensation are screened out according to the specific display effect, the auxiliary sub-pixels 14 corresponding to the main pixel units 10 are controlled to excite the quantum dot layer 24, and the main pixel units 10 are compensated by the excitation light generated by the quantum dot layer 24, so that the corresponding regions can stably emit light. The auxiliary sub-pixels 14 are independently controlled to work through the pixel electrodes, so that the optical compensation can be performed only in the corresponding areas, the compensation areas are not needed, the auxiliary sub-pixels 14 do not emit light, the power consumption of the OLED display panel is reduced, and the phenomenon of distortion caused by the fact that the areas with normal chromaticity are subjected to color difference with other areas with normal chromaticity after being compensated by the exciting light generated by the corresponding quantum dot layers 24 can be avoided.
As shown in fig. 1 and 4, a color filter layer 20 is further disposed on the cover plate 2 corresponding to the main pixel unit 10. The color filter layer 20 includes a red photoresist 21 corresponding to the red sub-pixel 11, a green photoresist 22 corresponding to the green sub-pixel 12, and a blue photoresist 23 corresponding to the blue sub-pixel 13. After the light emitted by the red sub-pixel 11, the green sub-pixel 12 and the blue sub-pixel 13 respectively passes through the light resistors of the corresponding colors, the color saturation of the corresponding colors can be improved, and the display quality is improved. In this embodiment, the cover plate 2 may be made of a transparent material, so that the light emitted from the red sub-pixel 11, the green sub-pixel 12, and the blue sub-pixel 13 is emitted through the cover plate 2, and when the color filter layer 20 needs to be configured, the corresponding light resistors are directly manufactured on the cover plate 2. The cover plate 2 may also be made of a non-light-transmitting material, at this time, through holes need to be formed in regions of the cover plate 2 corresponding to the red sub-pixel 11, the green sub-pixel 12, and the blue sub-pixel 13, light emitted by the red sub-pixel 11, the green sub-pixel 12, and the blue sub-pixel 13 is emitted through the corresponding through holes, and when the color filter layer 20 needs to be configured, the red photoresist 21, the green photoresist 22, and the blue photoresist 23 may be respectively disposed in the corresponding through holes.
Illustratively, the quantum dot layer 24 isAnd printing the inorganic quantum dot material to the film layer formed on the cover plate 2 by an ink-jet printing process. Specifically, inorganic quantum dot materials are made into inorganic quantum dot solution which is used as ink for ink-jet printing, and the inorganic quantum dot materials can adopt ZnCdS, CdSe/ZnS and SiN4Any one of the above materials.
The embodiment of the invention also provides a preparation method of the OLED display panel, which comprises the following steps:
s1, providing a TFT substrate 3, fabricating an OLED display device 1 on the TFT substrate 3, where the OLED display device 1 includes an anode layer 10b, an organic light emitting layer 10a, and a cathode layer 10c sequentially disposed on the TFT substrate 3, the OLED display device 1 further includes a pixel defining layer 15, and the pixel defining layer 15 defines a plurality of main pixel units 10 and auxiliary sub-pixels 14 corresponding to each of the main pixel units 10 in the OLED display device 1.
Specifically, in step S1, the anode layer 10b, the organic light emitting layer 10a, and the cathode layer 10c of the OLED display device 1 are fabricated on the TFT substrate 3 by an inkjet printing process.
More specifically, in step S1, a TFT substrate 3 is provided, a pixel defining layer 15 is formed on the TFT substrate 3, and an anode layer 10b, an organic light emitting layer 10a of a corresponding sub-pixel, and a cathode layer 10c are sequentially formed in different openings defined by the pixel defining layer 15 by an inkjet printing process, so as to form the red sub-pixel 11, the green sub-pixel 12, the blue sub-pixel 13, and the auxiliary sub-pixel 14, respectively, and obtain the OLED display device 1.
S2, a cover plate 2 is manufactured, and the quantum dot layer 24 corresponding to the auxiliary sub-pixel 14 is disposed on the cover plate 2.
In step S2, the quantum dot layer 24 is formed on the cover plate 2 by an inkjet printing process.
More specifically, in the step S2, a cover plate 2 is manufactured, and a red photoresist 21 corresponding to the red sub-pixel 11, a green photoresist 22 corresponding to the green sub-pixel 12, and a blue photoresist 23 corresponding to the blue sub-pixel 13 are respectively prepared on the cover plate 2 through coating, photolithography, and developing processes in sequence to form the color filter layer 20; and etching the area of the cover plate 2 corresponding to each auxiliary sub-pixel 14 to form a plurality of through holes respectively exposing each auxiliary sub-pixel 14, and manufacturing quantum dot layers 24 in the through holes respectively corresponding to the auxiliary sub-pixels 14 by adopting an ink-jet printing process.
And S3, packaging the cover plate 2 on the OLED display device 1 to obtain the OLED display panel. The quantum dot layers 24 on the cover plate 2 need to be aligned with the auxiliary sub-pixels 14 on the OLED display device 1 one by one, and then the cover plate 2 is packaged on the OLED display device 1, so as to ensure that light generated by the auxiliary sub-pixels 14 can be accurately emitted to the quantum dot layers 24 after the packaging is completed, and the quantum dot layers 24 are excited to emit light for compensating the main pixel unit 10.
In summary, in the OLED display panel and the method for manufacturing the same provided in this embodiment, the auxiliary sub-pixel 14 is disposed corresponding to each main pixel unit 10 in the OLED display panel, and the light emitted from the auxiliary sub-pixel 14 is used to excite the quantum dot layer 24, so that the light emitted from the quantum dot layer 24 compensates the light emitted from the main pixel unit 10. Since the chromaticity of the light emitted by the quantum dot layer 24 is higher than the chromaticity of the organic light under the same condition, the color saturation of the display screen can be effectively improved, and the chromaticity requirement to the light emitted by the main pixel unit 10 can be reduced, so that the attenuation speed of the sub-pixels of the main pixel unit 10 can be effectively reduced, and the service life of the sub-pixels can be prolonged.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims (9)

1. An OLED display panel comprises a TFT substrate and an OLED display device positioned on the TFT substrate, and is characterized in that the OLED display device comprises an anode layer, an organic light emitting layer and a cathode layer which are sequentially arranged on the TFT substrate, and further comprises a pixel defining layer, wherein the pixel defining layer defines a plurality of main pixel units and auxiliary sub-pixels corresponding to each main pixel unit in the OLED display device; the OLED display panel further comprises a cover plate arranged on the OLED display device, a quantum dot layer is arranged on the cover plate corresponding to the auxiliary sub-pixels, the quantum dot layer emits light after being excited by light emitted by the auxiliary sub-pixels to compensate light emitted by the main pixel unit, and the auxiliary sub-pixels can be respectively and independently controlled.
2. The OLED display panel of claim 1, wherein the main pixel unit includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the quantum dot layer emits blue light after being excited by the light emitted from the auxiliary sub-pixel, compensating for the light emitted from the blue sub-pixel.
3. The OLED display panel of claim 2, wherein the auxiliary sub-pixel is configured to emit blue light, and wherein the quantum dot layer is configured to emit blue light after being excited by the blue light.
4. The OLED display panel of claim 2, wherein the red, green, blue and auxiliary sub-pixels are equal in size.
5. The OLED display panel of claim 2, wherein the auxiliary subpixel is disposed adjacent to the blue subpixel.
6. The OLED display panel of any one of claims 2-5, wherein a color filter layer is disposed on the cover plate corresponding to the main pixel unit, and the color filter layer comprises a red photoresist corresponding to the red sub-pixel, a green photoresist corresponding to the green sub-pixel, and a blue photoresist corresponding to the blue sub-pixel.
7. The OLED display panel of claim 1, wherein the quantum dot layer is a film layer formed by printing inorganic quantum dot material onto the cover sheet by an inkjet printing process.
8. A method of manufacturing an OLED display panel as claimed in any one of claims 1 to 7, comprising the steps of:
s1, providing a TFT substrate, and manufacturing an OLED display device on the TFT substrate, wherein the OLED display device comprises an anode layer, an organic light emitting layer and a cathode layer which are sequentially arranged on the TFT substrate, and further comprises a pixel limiting layer which limits a plurality of main pixel units and auxiliary sub-pixels corresponding to each main pixel unit in the OLED display device;
s2, manufacturing a cover plate, wherein a quantum dot layer is arranged on the cover plate corresponding to the auxiliary sub-pixels;
and S3, packaging the cover plate on the OLED display device to obtain the OLED display panel.
9. The method for manufacturing the OLED display panel according to claim 8, wherein in the step S1, the anode layer, the organic light emitting layer and the cathode layer of the OLED display device are manufactured on the TFT substrate by an inkjet printing process;
in step S2, the quantum dot layer is fabricated on the cover plate by an inkjet printing process.
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