CN114447244A - OLED display panel and manufacturing method thereof - Google Patents

OLED display panel and manufacturing method thereof Download PDF

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Publication number
CN114447244A
CN114447244A CN202210053508.2A CN202210053508A CN114447244A CN 114447244 A CN114447244 A CN 114447244A CN 202210053508 A CN202210053508 A CN 202210053508A CN 114447244 A CN114447244 A CN 114447244A
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oled
electrode
layer
tft
functional layer
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戴棚棚
徐鸣
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to CN202210053508.2A priority Critical patent/CN114447244A/en
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • 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
    • 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
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass

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  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The application provides an OLED display panel and a manufacturing method thereof. The OLED display panel comprises a TFT array substrate, a first OLED, a first insulating layer, a second OLED, a second insulating layer and a third OLED. The first OLED comprises a first electrode arranged on the TFT array substrate, a first OLED functional layer arranged on the first electrode, and a second electrode arranged on the first OLED functional layer. The first insulating layer is arranged on the second electrode. The second OLED comprises a third electrode arranged on the first insulating layer, a second OLED functional layer arranged on the third electrode, and a fourth electrode arranged on the second OLED functional layer. The second insulating layer is arranged on the fourth electrode. The third OLED comprises a fifth electrode arranged on the second insulating layer, a third OLED functional layer arranged on the fifth electrode, and a sixth electrode arranged on the third OLED functional layer. The first OLED, the second OLED and the third OLED are stacked on the vertical surface and are insulated from each other, so that the occupied space can be reduced, and the resolution of the OLED display panel can be improved.

Description

OLED display panel and manufacturing method thereof
Technical Field
The application relates to the technical field of display devices, in particular to an OLED display panel and a manufacturing method thereof.
Background
The electroluminescent diode (OLED) has the advantages of simple manufacturing process, low cost, high light emitting efficiency, easy formation of flexible structure, low power consumption, high color saturation, wide viewing angle, and the like, and the display technology using the electroluminescent diode has become an important display technology.
OLEDs are current-mode light emitting devices that mainly include an anode, a cathode, and an OLED functional layer. The main working principle of the OLED is: the OLED functional layer emits light by carrier injection and recombination under the drive of an electric field formed by the anode and the cathode.
In the OLED display panel of the prior art, a plurality of sub-pixels are all arranged on the same horizontal plane, and one pixel is generally composed of three sub-pixels, the plurality of sub-pixels arranged on the same horizontal plane may cause the pixel to occupy more space, and reduce the resolution of the OLED display panel, and in order to increase the resolution, the prior art may reduce the size of the sub-pixels, and increase the difficulty of the manufacturing process and the process.
Disclosure of Invention
The application provides an OLED display panel and a manufacturing method thereof, which aim to solve the problem that the resolution of the OLED display panel is reduced by a plurality of sub-pixels which are arranged on the same horizontal plane of the OLED display panel in the prior art.
In one aspect, the present application provides an OLED display panel, including:
a TFT array substrate;
the first OLED comprises a first electrode arranged on the TFT array substrate, a first OLED functional layer arranged on the first electrode and a second electrode arranged on the first OLED functional layer;
a first insulating layer provided on the second electrode;
a second OLED including a third electrode disposed on the first insulating layer, a second OLED functional layer disposed on the third electrode, and a fourth electrode disposed on the second OLED functional layer;
a second insulating layer disposed on the fourth electrode;
and the third OLED comprises a fifth electrode arranged on the second insulating layer, a third OLED functional layer arranged on the fifth electrode and a sixth electrode arranged on the third OLED functional layer.
In some possible implementations, the first OLED functional layer includes a first light emitting layer, the second OLED functional layer includes a second light emitting layer, and the third OLED functional layer includes a third light emitting layer;
orthographic projections of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer on the TFT array substrate are overlapped.
In some possible implementations, the first electrode is a total reflection electrode.
In some possible implementations, the TFT array substrate includes a first TFT, a second TFT, and a third TFT that are disposed at intervals;
the first electrode is connected to the first TFT, the third electrode is connected to the second TFT, and the fifth electrode is connected to the third TFT.
In some possible implementations, the first TFT, the second TFT, and the third TFT are stacked.
On the other hand, the application also provides a manufacturing method of the OLED display panel, which includes:
manufacturing a first OLED on a TFT array substrate, wherein the first OLED comprises a first electrode arranged on the TFT array substrate, a first OLED functional layer arranged on the first electrode, and a second electrode arranged on the first OLED functional layer;
manufacturing a first insulating layer on the first OLED;
manufacturing a second OLED on the first insulating layer, wherein the second OLED comprises a third electrode arranged on the first insulating layer, a second OLED functional layer arranged on the third electrode, and a fourth electrode arranged on the second OLED functional layer;
manufacturing a second insulating layer on the second OLED;
and manufacturing a third OLED on the second insulating layer, wherein the third OLED comprises a fifth electrode arranged on the second insulating layer, a third OLED functional layer arranged on the fifth electrode, and a sixth electrode arranged on the third OLED functional layer.
In some possible implementations, the first OLED functional layer includes a first light emitting layer, the second OLED functional layer includes a second light emitting layer, and the third OLED functional layer includes a third light emitting layer;
orthographic projections of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer on the TFT array substrate are overlapped.
In some possible implementations, the first electrode is a total reflection electrode.
In some possible implementations, the TFT array substrate includes a first TFT, a second TFT, and a third TFT that are disposed at intervals;
the first electrode is connected to the first TFT, the third electrode is connected to the second TFT, and the fifth electrode is connected to the third TFT.
In some possible implementations, the first TFT, the second TFT, and the third TFT are stacked.
The OLED display panel provided by the application comprises a TFT array substrate, a first OLED, a first insulating layer, a second OLED, a second insulating layer and a third OLED. The first OLED comprises a first electrode arranged on the TFT array substrate, a first OLED functional layer arranged on the first electrode, and a second electrode arranged on the first OLED functional layer. The first insulating layer is arranged on the second electrode. The second OLED comprises a third electrode arranged on the first insulating layer, a second OLED functional layer arranged on the third electrode, and a fourth electrode arranged on the second OLED functional layer. The second insulating layer is arranged on the fourth electrode. The third OLED comprises a fifth electrode arranged on the second insulating layer, a third OLED functional layer arranged on the fifth electrode, and a sixth electrode arranged on the third OLED functional layer. That is, each OLED of the present application is a sub-pixel, and the first OLED, the second OLED and the third OLED are stacked and insulated from each other on the vertical plane, that is, three sub-pixels are stacked and arranged on the vertical plane to form a pixel, so that the occupied space can be reduced, and the resolution of the OLED display panel can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an OLED display panel according to an embodiment of the present application;
fig. 2 is a flowchart illustrating a method for fabricating an OLED display panel according to an embodiment of the present disclosure;
fig. 3 is a schematic view illustrating a method for manufacturing an OLED display panel according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of brevity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Referring to fig. 1, an embodiment of the present invention provides an OLED display panel, including:
a TFT (thin film transistor) array substrate 1;
a first OLED2, wherein the first OLED2 includes a first electrode 21 disposed on the TFT array substrate 1, a first OLED functional layer 22 disposed on the first electrode 21, and a second electrode 23 disposed on the first OLED functional layer 22;
a first insulating layer 3, the first insulating layer 3 being provided on the second electrode 23;
a second OLED4, the second OLED4 including a third electrode 41 disposed on the first insulating layer 3, a second OLED functional layer 42 disposed on the third electrode 41, and a fourth electrode 43 disposed on the second OLED functional layer 42;
a second insulating layer 5, the second insulating layer 5 being provided on the fourth electrode 43;
the third OLED6, the third OLED6 includes a fifth electrode 61 disposed on the second insulating layer 5, a third OLED functional layer 62 disposed on the fifth electrode 61, and a sixth electrode 63 disposed on the third OLED functional layer 62.
It should be noted that each OLED is a sub-pixel, the first OLED2, the second OLED4 and the third OLED6 are stacked in a vertical plane, and light emitted from the first OLED2, the second OLED4 and the third OLED6 can be mixed in the vertical plane, that is, three sub-pixels are stacked in the vertical plane to form a pixel. The first insulating layer 3 is located between the first OLED2 and the second OLED4, and the second insulating layer 5 is located between the second OLED4 and the third OLED6, so that the first OLED2, the second OLED4 and the third OLED6 are insulated from each other, mutual interference of voltage or current among the first OLED2, the second OLED4 and the third OLED6 is avoided, normal light emission of the first OLED2, the second OLED4 and the third OLED6 is ensured, and the display quality of the OLED display panel is improved.
In addition, the three sub-pixels are stacked on the vertical surface to form one pixel, so that the resolution of the OLED display panel is improved, the size of the sub-pixels (namely the OLED) is not required to be reduced for improving the resolution, the difficulty of the process can be avoided being increased, and the process yield is improved.
The application of the OLED display panel is not specifically limited, and the OLED display panel may be any product or component with a display function, such as a television, a notebook computer, a tablet computer, a wearable display device (e.g., a smart band, a smart watch, and the like), a mobile phone, a virtual reality device, an augmented reality device, a vehicle-mounted display, an advertising light box, and the like.
In some embodiments, referring to fig. 1, the first OLED functional layer 22 includes a first light emitting layer 221, the second OLED functional layer 42 includes a second light emitting layer 421, and the third OLED functional layer 62 includes a third light emitting layer 621. Orthographic projections of the first light-emitting layer 221, the second light-emitting layer 421 and the third light-emitting layer 621 on the TFT array substrate 1 overlap. That is, the second light-emitting layer 421 is located right above the first light-emitting layer 221, and the third light-emitting layer 621 is located right above the second light-emitting layer 421, so that the light emitted by the first light-emitting layer 221, the light emitted by the second light-emitting layer 421, and the light emitted by the third light-emitting layer 621 are mixed more uniformly, the pixel display quality is improved, and the display quality of the OLED display panel is improved.
In this embodiment, the first, second, and third light emitting layers 221, 421, and 621 may emit different colors of light. For example, the first light emitting layer 221 may emit light of one color of red, green, or blue, the second light emitting layer 421 may emit light of a color different from that of the first light emitting layer 221 in red, green, or blue, and the third light emitting layer 621 may emit light of a color different from that of the first light emitting layer 221 and the second light emitting layer 421 in red, green, or blue.
In this embodiment, referring to fig. 1, the first electrode 21 may be an anode, the second electrode 23 may be a cathode, and the first OLED functional layer 22 further includes a first hole transport layer 222 between the first electrode 21 and the first light emitting layer 221, and a first electron transport layer 223 between the second electrode 23 and the first light emitting layer 221. If the first electrode 21 is a cathode and the second electrode 23 is an anode, the first hole transport layer 222 and the first electron transport layer 223 are interchanged.
In addition, in order to improve the light emitting efficiency, the first OLED functional layer 22 may further include a first hole injection layer between the first electrode 21 and the first hole transport layer 222, and a first electron injection layer between the second electrode 23 and the first electron transport layer 223.
Likewise, the third electrode 41 may be an anode, the fourth electrode 43 may be a cathode, and the second OLED functional layer 42 further includes a second hole transport layer 422 between the third electrode 41 and the second light emitting layer 421, and a second electron transport layer 423 between the fourth electrode 43 and the second light emitting layer 421. If the third electrode 41 is a cathode and the fourth electrode 43 is an anode, the positions of the second hole transporting layer 422 and the second electron transporting layer 423 are interchanged.
In addition, in order to improve the light emitting efficiency, the second OLED functional layer 42 may further include a second hole injection layer between the third electrode 41 and the second hole transport layer 422, and a second electron injection layer between the fourth electrode 43 and the second electron transport layer 423.
Likewise, the fifth electrode 61 may be an anode, the sixth electrode 63 may be a cathode, and the third OLED functional layer 62 further includes a third hole transport layer 622 between the fifth electrode 61 and the third light emitting layer 621, and a third electron transport layer 623 between the sixth electrode 63 and the third light emitting layer 621. If the fifth electrode 61 is a cathode and the sixth electrode 63 is an anode, the positions of the third hole transport layer 622 and the third electron transport layer 623 are interchanged.
In addition, in order to improve the light emitting efficiency, the third OLED functional layer 62 may further include a third hole injection layer between the fifth electrode 61 and the third hole transport layer 622, and a third electron injection layer between the sixth electrode 63 and the third electron transport layer 623.
In some embodiments, the first electrode 21 is a total reflection electrode. The total reflection electrode can totally reflect the light emitted by the first light emitting layer 221, the second light emitting layer 421 and the third light emitting layer 621, so that the OLED display panel emits light upwards, and the totally reflected light can be mixed again, thereby improving the light emitting efficiency and brightness of the pixel.
In addition, the second electrode 23, the third electrode 41, the fourth electrode 43, the fifth electrode 61, and the sixth electrode 63 may be made of a transparent material, for example, Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), which ensures that the pixel emits light normally.
In this embodiment, referring to fig. 1, an area of the first electrode 21 may be larger than an area of the first light emitting layer 221, that is, an area of an orthogonal projection of the first electrode 21 on the TFT array substrate 1 is larger than an area of an orthogonal projection of the first light emitting layer 221 on the TFT array substrate 1, and the orthogonal projection of the first light emitting layer 221 on the TFT array substrate 1 is located in the orthogonal projection of the first electrode 21 on the TFT array substrate 1, so as to improve a total reflection effect.
In some embodiments, referring to fig. 1, the TFT array substrate 1 includes a first TFT11, a second TFT12, and a third TFT13 that are disposed at intervals. The first electrode 21 is connected to the first TFT11, the third electrode 41 is connected to the second TFT12, and the fifth electrode 61 is connected to the third TFT 13. The first TFT11, the second TFT12 and the third TFT13 are independent from each other, and the electrical properties of the three TFTs are not affected by each other, one TFT and one OLED are combined into one sub-pixel, the first TFT11, the second TFT12 and the third TFT13 can control the first OLED2, the second OLED4 and the third OLED6 respectively, so that currents with different sizes are input into the first OLED2, the second OLED4 and the third OLED6, the first OLED2, the second OLED4 and the third OLED6 are controlled to emit light rays with different brightness, and the first OLED2, the second OLED4 and the third OLED6 can emit light rays with different colors, so that the light rays with different colors and different brightness are mixed and superimposed, and the pixel displays different colors.
In addition, the second electrode 23, the fourth electrode 43, and the sixth electrode 63 may be all connected to a common voltage line to be connected to a common voltage.
In this embodiment, referring to fig. 1, a first TFT11, a second TFT12, and a third TFT13 are stacked. That is, the first TFT11, the second TFT12 and the third TFT13 are also stacked in the vertical plane, and compared with the related art in which a plurality of TFTs are arranged in a horizontal plane, the occupied space can be reduced, so that the resolution of the OLED display panel can be further improved, that is, more pixels can be disposed on the OLED display panel to increase the resolution of the OLED display panel with the same display area.
In this embodiment, each TFT includes an active layer, a first metal layer, a second metal layer, and an interlayer dielectric layer (i.e., an insulating film layer) formed therebetween. The first metal layer may include a gate, and the second metal layer may include a source and a drain connected to the gate.
In addition, an insulating film layer is also arranged between two adjacent TFTs. The first electrode 21, the third electrode 41, and the fifth electrode 61 are connected to drains of the first TFT11, the second TFT12, and the third TFT13, respectively. Also, the drains of the first TFT11, the second TFT12, and the third TFT13 are staggered in the vertical plane, not overlapped, so that the first electrode 21, the third electrode 41, and the fifth electrode 61 are connected to the drains of the first TFT11, the second TFT12, and the third TFT13, respectively, without interfering with each other.
In some embodiments, the OLED display panel further includes a substrate on which the TFT array substrate 1 is disposed. If the OLED display panel is rigid, the substrate may be a rigid material, such as glass, and if the OLED display panel is flexible, the substrate may be a flexible material, such as a structure in which an inorganic barrier layer and an organic buffer layer are stacked. The material of the inorganic barrier layer may be one or a combination of silicon nitride, silicon oxide, or silicon oxynitride. The material of the organic buffer layer may be Polyimide (PI), polyethylene terephthalate (PET), or Polydimethylsiloxane (PDMS).
Referring to fig. 2 and fig. 3, based on the OLED display panel, an embodiment of the present invention further provides a method for manufacturing an OLED display panel, including:
step S1, fabricating a first OLED2 on the TFT array substrate 1, where the first OLED2 includes a first electrode 21 disposed on the TFT array substrate 1, a first OLED functional layer 22 disposed on the first electrode 21, and a second electrode 23 disposed on the first OLED functional layer 22;
step S2, fabricating a first insulating layer 3 on the first OLED 2;
step S3, fabricating a second OLED4 on the first insulating layer 3, wherein the second OLED4 includes a third electrode 41 disposed on the first insulating layer 3, a second OLED functional layer 42 disposed on the third electrode 41, and a fourth electrode 43 disposed on the second OLED functional layer 42;
step S4, fabricating a second insulating layer 5 on the second OLED 4;
step S5, fabricating a third OLED6 on the second insulating layer 5, where the third OLED6 includes a fifth electrode 61 disposed on the second insulating layer 5, a third OLED functional layer 62 disposed on the fifth electrode 61, and a sixth electrode 63 disposed on the third OLED functional layer 62.
It should be noted that, each OLED is a sub-pixel, the first OLED2, the second OLED4 and the third OLED6 are stacked on the vertical plane, and light emitted from the first OLED2, the second OLED4 and the third OLED6 can be mixed on the vertical plane, that is, three sub-pixels are stacked on the vertical plane to form a pixel. The first insulating layer 3 is located between the first OLED2 and the second OLED4, and the second insulating layer 5 is located between the second OLED4 and the third OLED6, so that the first OLED2, the second OLED4 and the third OLED6 are insulated from each other, mutual interference of voltage or current among the first OLED2, the second OLED4 and the third OLED6 is avoided, normal light emission of the first OLED2, the second OLED4 and the third OLED6 is ensured, and the display quality of the OLED display panel is improved.
In addition, the three sub-pixels are stacked on the vertical surface to form one pixel, so that the resolution of the OLED display panel is improved, the size of the sub-pixels (namely the OLED) is not required to be reduced for improving the resolution, the difficulty of the process can be avoided being increased, and the process yield is improved.
In some embodiments, referring to fig. 3, the first OLED functional layer 22 includes a first light emitting layer 221, the second OLED functional layer 42 includes a second light emitting layer 421, and the third OLED functional layer 62 includes a third light emitting layer 621. Orthographic projections of the first light-emitting layer 221, the second light-emitting layer 421, and the third light-emitting layer 621 on the TFT array substrate 1 overlap. That is, the second light-emitting layer 421 is located right above the first light-emitting layer 221, and the third light-emitting layer 621 is located right above the second light-emitting layer 421, so that light emitted by the first light-emitting layer 221, the second light-emitting layer 421 and the third light-emitting layer 621 are mixed more uniformly, the pixel display quality is improved, and the display quality of the OLED display panel is improved.
In some embodiments, the first electrode 21 is a total reflection electrode. The total reflection electrode can totally reflect the light emitted by the first light emitting layer 221, the second light emitting layer 421 and the third light emitting layer 621, so that the OLED display panel emits light upwards, and the totally reflected light can be mixed again, thereby improving the light emitting efficiency and brightness of the pixel.
In some embodiments, referring to fig. 3, the TFT array substrate 1 includes a first TFT11, a second TFT12, and a third TFT13 that are disposed at intervals. The first electrode 21 is connected to the first TFT11, the third electrode 41 is connected to the second TFT12, and the fifth electrode 61 is connected to the third TFT 13. The first TFT11, the second TFT12 and the third TFT13 are independent from each other, and the electrical properties of the three TFTs are not affected by each other, one TFT and one OLED are combined into one sub-pixel, the first TFT11, the second TFT12 and the third TFT13 can control the first OLED2, the second OLED4 and the third OLED6 respectively, so that currents with different sizes are input into the first OLED2, the second OLED4 and the third OLED6, the first OLED2, the second OLED4 and the third OLED6 are controlled to emit light rays with different brightness, and the first OLED2, the second OLED4 and the third OLED6 can emit light rays with different colors, so that the light rays with different colors and different brightness are mixed and superimposed, and the pixel displays different colors.
In this embodiment, referring to fig. 3, a first TFT11, a second TFT12, and a third TFT13 are stacked. That is, the first TFT11, the second TFT12 and the third TFT13 are also stacked on the vertical plane, and compared with a plurality of TFTs arranged in a horizontal plane in the prior art, the occupied space can be reduced, so that the resolution of the OLED display panel can be further improved, that is, more pixels can be arranged on the OLED display panel in the same display area, so as to increase the resolution of the OLED display panel.
In this embodiment, in step S1, the OLED display panel may be first fabricated on the substrate. If the OLED display panel is rigid, the substrate may be a rigid material, such as glass, and if the OLED display panel is flexible, the substrate may be a flexible material, such as a structure in which an inorganic barrier layer and an organic buffer layer are stacked. The material of the inorganic barrier layer may be one or a combination of silicon nitride, silicon oxide, or silicon oxynitride. The material of the organic buffer layer may be polyimide, polyethylene terephthalate, or polydimethylsiloxane.
In addition, in step S1, the substrate may be fabricated on the carrier board with the sacrificial layer, and after the OLED display panel is fabricated, the carrier board with the sacrificial layer is peeled off. The sacrificial layer may be made of amorphous silicon (a-Si), and the carrier plate may be made of glass.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing method embodiment, which is not described herein again.
The OLED display panel and the manufacturing method thereof provided in the embodiments of the present application are described in detail above, and specific examples are applied in the description to explain the principle and the implementation manner of the embodiments of the present application, and the description of the embodiments above is only used to help understanding the technical solutions and the core ideas of the embodiments of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims (10)

1. An OLED display panel, comprising:
a TFT array substrate;
the first OLED comprises a first electrode arranged on the TFT array substrate, a first OLED functional layer arranged on the first electrode and a second electrode arranged on the first OLED functional layer;
a first insulating layer provided on the second electrode;
a second OLED including a third electrode disposed on the first insulating layer, a second OLED functional layer disposed on the third electrode, and a fourth electrode disposed on the second OLED functional layer;
a second insulating layer disposed on the fourth electrode;
and the third OLED comprises a fifth electrode arranged on the second insulating layer, a third OLED functional layer arranged on the fifth electrode and a sixth electrode arranged on the third OLED functional layer.
2. The OLED display panel of claim 1, wherein the first OLED functional layer comprises a first light emitting layer, the second OLED functional layer comprises a second light emitting layer, and the third OLED functional layer comprises a third light emitting layer;
orthographic projections of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer on the TFT array substrate are overlapped.
3. The OLED display panel of claim 1, wherein the first electrode is a fully reflective electrode.
4. The OLED display panel according to claim 1, wherein the TFT array substrate comprises a first TFT, a second TFT and a third TFT arranged at intervals;
the first electrode is connected to the first TFT, the third electrode is connected to the second TFT, and the fifth electrode is connected to the third TFT.
5. The OLED display panel of claim 4, wherein the first TFT, the second TFT, and the third TFT are disposed in a stack.
6. A manufacturing method of an OLED display panel is characterized by comprising the following steps:
manufacturing a first OLED on a TFT array substrate, wherein the first OLED comprises a first electrode arranged on the TFT array substrate, a first OLED functional layer arranged on the first electrode, and a second electrode arranged on the first OLED functional layer;
manufacturing a first insulating layer on the first OLED;
manufacturing a second OLED on the first insulating layer, wherein the second OLED comprises a third electrode arranged on the first insulating layer, a second OLED functional layer arranged on the third electrode, and a fourth electrode arranged on the second OLED functional layer;
manufacturing a second insulating layer on the second OLED;
and manufacturing a third OLED on the second insulating layer, wherein the third OLED comprises a fifth electrode arranged on the second insulating layer, a third OLED functional layer arranged on the fifth electrode, and a sixth electrode arranged on the third OLED functional layer.
7. The method of claim 6, wherein the first OLED functional layer comprises a first light emitting layer, the second OLED functional layer comprises a second light emitting layer, and the third OLED functional layer comprises a third light emitting layer;
orthographic projections of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer on the TFT array substrate are overlapped.
8. The method of claim 6, wherein the first electrode is a fully reflective electrode.
9. The method for manufacturing the OLED display panel according to claim 6, wherein the TFT array substrate comprises a first TFT, a second TFT and a third TFT arranged at intervals;
the first electrode is connected to the first TFT, the third electrode is connected to the second TFT, and the fifth electrode is connected to the third TFT.
10. The method of manufacturing an OLED display panel according to claim 6, wherein the first TFT, the second TFT, and the third TFT are stacked.
CN202210053508.2A 2022-01-18 2022-01-18 OLED display panel and manufacturing method thereof Pending CN114447244A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105870154A (en) * 2016-04-28 2016-08-17 京东方科技集团股份有限公司 Array substrate and manufacturing method thereof and OLED display device
CN108400154A (en) * 2018-04-11 2018-08-14 武汉华星光电半导体显示技术有限公司 OLED panel

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN105870154A (en) * 2016-04-28 2016-08-17 京东方科技集团股份有限公司 Array substrate and manufacturing method thereof and OLED display device
CN108400154A (en) * 2018-04-11 2018-08-14 武汉华星光电半导体显示技术有限公司 OLED panel

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