CN111201627A - Pixel structure of OLED display device, preparation method and OLED display structure - Google Patents
Pixel structure of OLED display device, preparation method and OLED display structure Download PDFInfo
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- 230000008020 evaporation Effects 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims description 21
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- 239000003086 colorant Substances 0.000 claims description 12
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- 238000007747 plating Methods 0.000 claims description 2
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- 230000003287 optical effect Effects 0.000 description 6
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- 238000007740 vapor deposition Methods 0.000 description 3
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- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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Abstract
A preparation method of an OLED pixel structure is provided, which comprises the following steps: preparing an anode (24), wherein a first sub-pixel area (21), a second sub-pixel area (22) and a third sub-pixel area (23) are divided on the anode (24); forming a hole transport layer (26) by evaporation on the anode (24); a first single-primary-color hole transport layer (27) is formed in the position of the hole transport layer (26) corresponding to the first sub-pixel area (21) through evaporation; preparing a cathode (31); and a second single primary color filter (321) and a third single primary color filter (322) are distributed on the cathode (31) corresponding to the positions of the second sub-pixel area (22) and the third sub-pixel area (23). An OLED pixel structure and an OLED display structure are also provided. The OLED pixel structure, the OLED pixel method and the OLED display structure have high resolution and high luminous efficiency.
Description
The invention relates to the technical field of display, in particular to a pixel structure of an OLED display device, a preparation method and an OLED display structure.
Organic Light-Emitting display (OLED) is a next-generation novel display technology and lighting technology, and has a great application prospect. The red, green and blue (RGB) sub-pixels of the mass-produced medium and small-sized active matrix Organic electroluminescent display (AMOLED) all adopt the evaporation technology, the resolution ratio is limited by the mask plate preparation process and is difficult to improve, and the OLED screen of the white OLED plus color filter mode can provide higher resolution ratio, but the Light intensity of 2/3 is absorbed by the filter usually, so the whole power consumption is very high, and the mass production cannot be realized in the application of the medium and small-sized AMOLED.
Disclosure of Invention
The embodiment of the invention discloses a pixel structure of an OLED display device, a preparation method and an OLED display structure, which have higher resolution and higher luminous efficiency.
An OLED pixel structure is divided into a first sub-pixel area, a second sub-pixel area and a third sub-pixel area; a hole transmission layer and a first single primary color hole transmission layer are formed between the anode and the cathode of the OLED pixel structure through evaporation, and a second single primary color filter and a third single primary color filter are formed on one side of the cathode, which is far away from the anode; the first single-primary-color hole transport layer is formed at a position of the hole transport layer corresponding to the first sub-pixel region, the second single-primary-color filter is formed at a position corresponding to the second sub-pixel region, and the third single-primary-color filter is formed at a position corresponding to the third sub-pixel region.
A preparation method of an OLED pixel structure comprises the following steps: preparing an anode, wherein a first sub-pixel area, a second sub-pixel area and a third sub-pixel area are divided on the anode; forming a hole transport layer on the anode by evaporation; evaporating and plating a first single primary color hole transport layer at the position of the hole transport layer corresponding to the first secondary pixel area; preparing a cathode; and forming a second single primary color filter and a third single primary color filter on the cathode in a distribution manner corresponding to the second sub-pixel area and the third sub-pixel area.
An OLED display structure comprising a plurality of pixels arranged in rows and columns, said pixels having a pixel structure as described above.
According to the OLED pixel structure, the preparation method and the OLED display structure, the single primary color light is formed only at the position corresponding to the first pixel area through evaporation, and the single primary color light is formed in the second pixel area and the third pixel area through the optical filters, so that the process yield is high, the light emitting efficiency of the OLED display structure is high, the resolution is high, and the cost is low.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described 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 that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a method for manufacturing an OLED pixel structure according to an embodiment of the invention.
Fig. 2 to 9 are schematic diagrams illustrating a method for fabricating an OLED pixel structure according to a first preferred embodiment of the invention; fig. 2 is a schematic cross-sectional view of a substrate, fig. 3 is a schematic cross-sectional view of an anode formed on the substrate, fig. 4 is a schematic cross-sectional view of a hole injection layer, fig. 5 is a schematic cross-sectional view of a hole transport layer and a first single-primary-color hole transport layer, fig. 6 is a schematic cross-sectional view of a white layer, fig. 7 is a schematic cross-sectional view of an electron transport layer and an electron injection layer, fig. 8 is a schematic cross-sectional view of a cathode, and fig. 9 is a schematic cross-sectional view of an OLED pixel structure obtained after a second single-primary-color filter and a third single-primary-.
Fig. 10 is a schematic diagram of an OLED pixel structure according to another embodiment of the invention.
Fig. 11 is a schematic diagram of an OLED pixel structure according to another embodiment of the invention.
Fig. 12 is a schematic plan view of an OLED display structure based on the OLED pixel structure of the above embodiment.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the technical solutions of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Please refer to fig. 1. Fig. 1 is a flow chart of a method for manufacturing an OLED pixel structure according to the present invention, and the method for manufacturing an OLED pixel structure mainly includes the following steps:
step 101: providing a substrate, and defining a first sub-pixel area, a second sub-pixel area and a third sub-pixel area on the substrate;
step 102: forming an anode at the position corresponding to the first sub-pixel area, the second sub-pixel area and the third sub-pixel area on the substrate;
step 103: sequentially forming a Hole Injection Layer (HIL) on the anode by evaporation;
step 104: forming a Hole Transport Layer (HTL) on the HIL layer, and forming a first single primary color HTL layer on the HTL layer by evaporation at a position corresponding to the first sub-pixel area;
step 105: forming a white light layer on the first single primary color HTL layer and on the HTL layer corresponding to the positions of the second sub-pixel area and the third sub-pixel area;
step 106: forming an Electron Transport Layer (ETL) and an Electron Injection Layer (EIL) on the white light layer;
step 107: forming a cathode; and
step 108: and a second single primary color filter and a third single primary color filter are distributed on the cathode corresponding to the second secondary pixel area and the third secondary pixel area.
The first single primary color, the second single primary color and the third single primary color are different primary colors and are respectively one of red, green and blue.
Please refer to fig. 2 to fig. 9. Fig. 2 to 9 are schematic diagrams illustrating a method for fabricating an OLED pixel structure according to a first preferred embodiment of the invention.
As shown in fig. 2, a substrate 20 is provided, the substrate 20 is divided into a first sub-pixel area 21, a second sub-pixel area 22 and a third sub-pixel area 23 for displaying different primary colors.
As shown in fig. 3, an anode 24 is formed in the first sub-pixel region 21, the second sub-pixel region 22 and the third sub-pixel region 23 of the substrate 20, respectively. In this embodiment, the anode 24 is divided into a first anode 241, a second anode 242 and a third anode 243, and the first anode 241, the second anode 242 and the third anode 243 can be formed by an evaporation process and a Fine Metal Mask (FMM), but not limited thereto. For example, the first anode 241, the second anode 242 and the third anode 243 can also be formed by using a chemical vapor deposition process in combination with a developing and etching process. In the present embodiment, the OLED display device may be a top emission type (top emission type) electroluminescent display panel, and thus the first anode 241, the second anode 242, and the third anode 243 may be reflective electrodes, such as thick metal electrodes, but not limited thereto.
As shown in fig. 4, a hole injection layer 25 is formed in the first sub-pixel region 21, the second sub-pixel region 22 and the third sub-pixel region 23 of the substrate 20. The hole injection layer 25 may be formed by, for example, an evaporation process, but is not limited thereto.
As shown in fig. 5, subsequently, a hole transport layer 26 is formed on the hole injection layer 25 of the substrate 20, and a first single-primary-color hole transport layer 27 is formed by evaporation at a position of the hole transport layer 26 corresponding to the first sub-pixel region; the hole transport layer 26 may be formed by an evaporation process, and the first single-primary-color hole transport layer 27 may be formed by an evaporation process with a fine metal mask, but not limited thereto. In this way, in the first sub-pixel region 21, the hole transport layer 26 and the first single-primary-color hole transport layer 27 stacked on the hole transport layer 26 may form a first hole transport layer 261, in the second sub-pixel region 22, the hole transport layer 26 may form a second hole transport layer 262, and in the third sub-pixel region 23, the hole transport layer 26 may form a third hole transport layer 263, where the thickness of the first hole transport layer 261 is greater than that of the second hole transport layer 262 and is also greater than that of the third hole transport layer 263.
As shown in fig. 6, a white layer 28 is formed on the hole transport layer 26 at positions corresponding to the second sub-pixel region 22 and the third sub-pixel region 23 and on the first single-primary-color hole transport layer 27. The white layer 28 may be formed by, for example, an evaporation process, but not limited thereto. Since the thickness of the first hole transport layer 261 is greater than the thickness of the second hole transport layer 262 and greater than the thickness of the third hole transport layer 263, the white layer 28 slightly protrudes at a position corresponding to the first sub-pixel region 21.
In other embodiments, the white layer 28 may not protrude at the first pixel region 21 by adjusting the evaporation process.
As shown in fig. 7, an Electron Transport Layer (ETL)29 is formed at positions of the white layer 28 corresponding to the first sub-pixel region 21, the second sub-pixel region 22 and the third sub-pixel region 23, and an Electron Injection Layer (EIL)30 is formed at positions of the electron transport layer 29 corresponding to the first sub-pixel region 21, the second sub-pixel region 22 and the third sub-pixel region 23. The electron transport layer 29 and the electron injection layer 30 may be formed by, for example, an evaporation process, but not limited thereto.
As shown in fig. 8, a cathode 31 is formed in the first sub-pixel region 21, the second sub-pixel region 22 and the third sub-pixel region 23 of the substrate 20, respectively. In the present embodiment, the cathode 31 is divided into a first cathode 311, a second cathode 312 and a third cathode 313, and the first cathode 311, the second cathode 312 and the third cathode 313 may be formed by, for example, an evaporation process, but not limited thereto. The OLED display device of the present embodiment may be an electroluminescence display panel, i.e. light is emitted from the cathode, and therefore the first cathode 311, the second cathode 312 and the third cathode 313 may be transflective electrodes, such as thin metal electrodes, but not limited thereto. The first cathode 311, the second cathode 312, and the third cathode 313 may be electrically connected to each other and driven by applying a common voltage, or electrically separated from each other and driven by applying different voltages.
In this embodiment, since the thickness of the first hole transport layer 261 is larger than the thickness of the second hole transport layer 262 and larger than the thickness of the third hole transport layer 263, the white light layer 28, the electron transport layer 29, the electron injection layer 30, and the cathode 31 are slightly protruded at the positions corresponding to the first sub-pixel region 21 than at the positions corresponding to the second sub-pixel region 22 and the third sub-pixel region 23, that is, the white light layer 28, the electron transport layer 29, the electron injection layer 30, and the cathode 31 are protruded in the direction away from the anode at the positions corresponding to the first sub-pixel region 21 after vapor deposition.
In other embodiments, the white layer 28, the electron transport layer 29, the electron injection layer 30 and the cathode 31 may not protrude from the first sub-pixel region 21.
As shown in fig. 9, a second single-primary-color filter 321 and a third single-primary-color filter 322 are formed at the positions of the cathode 31 corresponding to the second sub-pixel region 22 and the third sub-pixel region 23, respectively, so as to manufacture the OLED pixel structure 40 of the present embodiment. In this embodiment, the second single primary color filter 321 and the third single primary color filter 322 may be adhered to a side of the cathode 31 away from the anode 24 by an adhesive, but not limited thereto.
Compared with the traditional manufacturing process mode that red, green and blue sub-pixels adopt the evaporation technology, the preparation method of the OLED pixel structure provided by the embodiment of the technical scheme has the following advantages:
1. the traditional process of adopting the evaporation technology for the red, green and blue sub-pixels needs six fine metal mask plates (FMMs); in the embodiment of the technical scheme, a first single primary color hole transmission layer is formed at a position corresponding to a first secondary pixel area by evaporation so as to generate a first single primary color light in the first secondary pixel area, and a second single primary color filter and a third single primary color filter are formed at positions corresponding to a second secondary pixel area and a third secondary pixel area so as to generate a second single primary color light and a third single primary color light respectively in the second secondary pixel area and the third secondary pixel area; that is, the monochromatic light is formed only in the position corresponding to the first sub-pixel region by evaporation, and the monochromatic light is formed in the second and third sub-pixel regions by the optical filter, so that only one fine metal mask plate is needed in the evaporation of the embodiment of the technical scheme;
2. furthermore, in the embodiment of the technical scheme, the monochromatic light is formed only at the position corresponding to the first-time pixel region through evaporation, which also means that the distance between the fine metal mask plates is increased, so that the color mixing probability can be reduced, and the process yield is increased;
3. in addition, only one fine metal mask plate is needed for vapor deposition in the embodiment of the technical scheme, and compared with the traditional red, green and blue sub-pixels needing six fine metal mask plates which are all manufactured by adopting a vapor deposition technology, the use number of the fine metal mask plates is greatly reduced, and therefore the manufacturing cost of the OLED display device can be effectively reduced.
Compared with the traditional process method of adding the color filter to the white light, the preparation method of the OLED pixel structure provided by the embodiment of the technical scheme has the following advantages:
1. in the traditional process of manufacturing the white light and the color filter, the three primary colors of red, green and blue need to emit light through the filter; in the embodiment of the technical scheme, only two primary colors of the three primary colors of red, green and blue need to be emitted by the optical filter, namely, the using number and the area of the optical filter are reduced, so that the light intensity lost by the absorption of the optical filter is greatly reduced, namely, the light emitting efficiency of the OLED display device is increased, and the power consumption of the OLED display device is reduced;
2. the resolution of the OLED display device obtained by the traditional white light plus color filter manufacturing process method is lower than that of the OLED display device obtained by the traditional red, green and blue sub-pixels adopting the evaporation technology, in the embodiment of the technical scheme, one primary color light is formed by the evaporation technology, and only two primary color lights are formed by the white light plus color filter, so that the resolution of the OLED display device formed by the embodiment of the technical scheme is higher than that of the OLED display device formed by the traditional white light plus color filter manufacturing process method;
3. in addition, the number and area of the filters in the embodiment of the technical scheme are reduced, and compared with the traditional manufacturing method of the white light and color filters, the manufacturing cost of the OLED display device can be effectively reduced.
The following is an example of the OLED pixel structure according to the present embodiment.
The OLED pixel structure of this embodiment is divided into a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region. The colors displayed by the first secondary pixel area, the second secondary pixel area and the third secondary pixel area are different from each other and respectively correspond to one of three primary colors of red, green and blue. The single primary color of the first secondary pixel area is obtained by evaporating a single primary color hole transport layer, and the single primary colors of the second secondary pixel area and the third secondary pixel area are obtained by a white light layer and an optical filter.
Referring to fig. 9 again, fig. 9 is a schematic view of an OLED pixel structure according to a preferred embodiment of the invention.
In the present embodiment, an OLED pixel structure 40 is divided into a first sub-pixel area 21, a second sub-pixel area 22 and a third sub-pixel area 23. A hole transport layer 26 and a first single-primary-color hole transport layer 27 are formed between the anode 24 and the cathode 31 of the OLED pixel structure 40 by evaporation, and a second single-primary-color filter 321 and a third single-primary-color filter 322 are formed on the side of the cathode 31 away from the anode. The hole transport layer 26 is formed at a position corresponding to the first sub-pixel region 21, the second sub-pixel region 22 and the third sub-pixel region 23, the first single-primary-color hole transport layer 27 is formed at a position corresponding to the first sub-pixel region 21 of the hole transport layer 26, the second single-primary-color filter 321 is formed at a position corresponding to the second sub-pixel region 22, and the third single-primary-color filter 322 is formed at a position corresponding to the third sub-pixel region 23.
In the first sub-pixel region 21, the hole transport layer 26 and the first single-primary-color hole transport layer 27 stacked on the hole transport layer 26 may form a first hole transport layer 261, in the second sub-pixel region 22, the hole transport layer 26 may form a second hole transport layer 262, and in the third sub-pixel region 23, the hole transport layer 26 may form a third hole transport layer 263, wherein the thickness of the first hole transport layer 261 is greater than that of the second hole transport layer 262 and is also greater than that of the third hole transport layer 263.
In this embodiment, the first sub-pixel region 21, the second sub-pixel region 22, and the third sub-pixel region 23 are sequentially arranged, that is, the first sub-pixel region 21 and the third sub-pixel region 23 are respectively located at two sides of the second sub-pixel region 22; the first single-primary-color hole transport layer 27 is a red hole transport layer, or the color displayed by the first sub-pixel region 21 is red; the second single primary color filter 321 and the third single primary color filter 322 are a green filter and a blue filter, respectively, or the color displayed by the second sub-pixel region 22 is green, and the color displayed by the third sub-pixel region 23 is blue.
In this embodiment, the OLED pixel structure 40 further includes a substrate 20, and the anode 24 is formed on the substrate 20; a hole injection layer 25 formed between the hole transport layer 26 and the anode 24; a white light layer 28 formed on the hole transport layer 26 at a position corresponding to the second sub-pixel region 22 and the third sub-pixel region 23 and on the first single-primary-color hole transport layer 27; an electron transport layer 29 formed on a side of the white light layer 28 away from the anode 24; an electron injection layer 30 is formed between the electron transport layer 29 and the cathode 31.
Since the thickness of the first hole transport layer 261 is greater than the thickness of the second hole transport layer 262 and also greater than the thickness of the third hole transport layer 263, the white layer 28, the electron transport layer 29, the electron injection layer 30, and the cathode 31 are slightly more protruded at the positions corresponding to the first sub-pixel region 21 than at the positions corresponding to the second sub-pixel region 22 and the third sub-pixel region 23, that is, the white layer 28, the electron transport layer 29, the electron injection layer 30, and the cathode 31 are protruded in the direction away from the anode at the positions corresponding to the first sub-pixel region 21.
In other embodiments, the white layer 28, the electron transport layer 29, the electron injection layer 30 and the cathode 31 may not protrude from the first sub-pixel region 21.
In this embodiment, the anode 24 is divided into a first anode 241, a second anode 242, and a third anode 243; in the present embodiment, the OLED display device may be a top emission type electroluminescent display panel, and thus the first anode 241, the second anode 242, and the third anode 243 may be reflective electrodes, such as thick metal electrodes, but not limited thereto.
In this embodiment, the cathode 31 is divided into a first cathode 311, a second cathode 312 and a third cathode 313, and the first cathode 311, the second cathode 312 and the third cathode 313 may be formed by, for example, an evaporation process, but not limited thereto. The OLED display device of the present embodiment may be an electroluminescence display panel, and therefore the first cathode 311, the second cathode 312 and the third cathode 313 may be transflective electrodes, such as thin metal electrodes, but not limited thereto. The first cathode 311, the second cathode 312, and the third cathode 313 may be electrically connected to each other and driven by applying a common voltage, or electrically separated from each other and driven by applying different voltages.
Referring to fig. 10, fig. 10 is a schematic view of an OLED pixel structure according to another preferred embodiment of the invention. The OLED pixel structure 41 of the present embodiment is substantially the same as the OLED pixel structure 40 of the embodiment shown in fig. 9, except that in the present embodiment, the second sub-pixel region 22 and the third sub-pixel region 23 are respectively located at two sides of the first sub-pixel region 21; the first single-primary-color hole transport layer 27 is a green hole transport layer, or the color displayed by the first sub-pixel region 21 is green; the second single primary color filter 321 and the third single primary color filter 322 are a red filter and a blue filter, respectively, or the color displayed by the second sub-pixel region 22 is red, and the color displayed by the third sub-pixel region 23 is blue.
Referring to fig. 11, fig. 11 is a schematic view of an OLED pixel structure according to another preferred embodiment of the invention. The OLED pixel structure 42 of the present embodiment is substantially the same as the OLED pixel structure 40 of the embodiment shown in fig. 9, except that in the present embodiment, the first sub-pixel region 21 and the third sub-pixel region 23 are respectively located at two sides of the second sub-pixel region 22; the first single-primary-color hole transport layer 27 is a blue hole transport layer, or the color displayed by the first sub-pixel region 21 is blue; the second single primary color filter 321 and the third single primary color filter 322 are respectively a red filter and a green filter, or the color displayed by the second sub-pixel region 22 is red, and the color displayed by the third sub-pixel region 23 is green.
The arrangement and the display color of the sub-pixel region of the OLED pixel structure in this embodiment may also be changed, and are not limited to the above embodiments, which are not listed here.
In the OLED pixel structures 40, 41, and 42, a first micro-resonant cavity (micro cavity)331 is formed between the first anode 241 and the first cathode 311 in the first sub-pixel region 21, a second micro-resonant cavity 332 is formed between the second anode 242 and the second cathode 312 in the second sub-pixel region 22, and a third micro-resonant cavity 333 is formed between the third anode 243 and the third cathode 313 in the third sub-pixel region 23. Since the first hole transport layer 261 has a different thickness from the second hole transport layer 262 and the third hole transport layer 263, the first micro-resonant cavity 331 has a different cavity length (cavitylength) from the second micro-resonant cavity 332 and the third micro-resonant cavity 333, so that the first primary color light L1 can be generated in the first sub-pixel region 21, and the white light can be generated in the second sub-pixel region 22 and the third sub-pixel region 23; since the second and third single primary color filters 321 and 322 are formed on the cathode 31 away from the anode 24, the white light in the second and third sub-pixel regions 22 and 23 passes through the second and third single primary color filters 321 and 322, and then the second and third primary color lights L2 and L3 are generated in the second and third sub-pixel regions 22 and 23, respectively.
The first single-primary-color hole transport layer 27 of the OLED pixel structure in the embodiment of the present technical solution may be located in the middle of the OLED pixel structure, or may be located on any side of two sides of the OLED pixel structure, and is relatively flexible in setting and wider in application range.
Referring to fig. 12, fig. 12 is a schematic plan view of an OLED display structure based on the OLED pixel structure of the above embodiment. In this embodiment, an OLED display structure 50 includes a plurality of pixels arranged in rows and columns, wherein each pixel employs the OLED pixel structure 40 in the above-mentioned embodiment, or employs the OLED pixel structure 41 in the above-mentioned embodiment, or employs the OLED pixel structure 42 in the above-mentioned embodiment.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (16)
- The OLED pixel structure is characterized in that the OLED pixel structure is divided into a first sub-pixel area, a second sub-pixel area and a third sub-pixel area; a hole transmission layer and a first single primary color hole transmission layer are formed between the anode and the cathode of the OLED pixel structure through evaporation, and a second single primary color filter and a third single primary color filter are formed on one side of the cathode, which is far away from the anode; the first single-primary-color hole transport layer is formed at a position of the hole transport layer corresponding to the first secondary pixel area, the second single-primary-color filter is formed at a position corresponding to the second secondary pixel area, and the third single-primary-color filter is formed at a position corresponding to the third secondary pixel area; the OLED pixel structure further comprises a white light layer, and the white light layer is formed on the hole transport layer, corresponds to the positions of the second sub-pixel area and the third sub-pixel area, and is formed on the first single-primary-color hole transport layer.
- The OLED pixel structure of claim 1, wherein in the first sub-pixel region, the hole transport layer and a first single-primary-color hole transport layer stacked on the hole transport layer form a first hole transport layer, in the second sub-pixel region, the hole transport layer forms a second hole transport layer, and in the third sub-pixel region, the hole transport layer forms a third hole transport layer, wherein a thickness of the first hole transport layer is greater than a thickness of the second hole transport layer and is also greater than a thickness of the third hole transport layer.
- The OLED pixel structure of claim 1, further comprising an electron transport layer formed on a side of said white light layer remote from said anode, and an electron injection layer formed between said electron transport layer and said cathode.
- The OLED pixel structure of claim 1, further comprising a hole injection layer formed between said hole transport layer and said anode.
- The OLED pixel structure of claim 1, wherein said anode is a reflective electrode and said cathode is a transflective electrode.
- The OLED pixel structure of claim 1, wherein the second sub-pixel region and the third sub-pixel region are respectively located at both sides of the first sub-pixel region.
- The OLED pixel structure of claim 1, wherein the first sub-pixel region and the third sub-pixel region are respectively located at both sides of the second sub-pixel region.
- The OLED pixel structure of claim 1, wherein said first sub-pixel region, said second sub-pixel region, and said third sub-pixel region display different colors and correspond to one of three single primary colors of red, green, and blue, respectively.
- A preparation method of an OLED pixel structure comprises the following steps:preparing an anode, wherein a first sub-pixel area, a second sub-pixel area and a third sub-pixel area are divided on the anode;forming a hole transport layer on the anode by evaporation;evaporating and plating a first single primary color hole transport layer at the position of the hole transport layer corresponding to the first secondary pixel area;forming a white light layer on the hole transport layer at positions corresponding to the second sub-pixel region and the third sub-pixel region and on the first single-primary-color hole transport layer;preparing a cathode; andand a second single primary color filter and a third single primary color filter are distributed on the cathode corresponding to the second secondary pixel area and the third secondary pixel area.
- The method of claim 9, wherein the first single-primary-color hole transport layer is formed by an evaporation process with a fine metal mask; in the first sub-pixel region, the hole transport layer and the first single primary color hole transport layer stacked on the hole transport layer form a first hole transport layer, in the second sub-pixel region, the hole transport layer forms a second hole transport layer, and in the third sub-pixel region, the hole transport layer forms a third hole transport layer, wherein the thickness of the first hole transport layer is larger than that of the second hole transport layer and is also larger than that of the third hole transport layer.
- The method of claim 9, wherein a hole injection layer is formed on the anode before a hole transport layer is deposited on the anode.
- The method according to claim 9, wherein after the white light layer is formed, an electron transport layer is further formed on the white light layer at positions corresponding to the first sub-pixel region, the second sub-pixel region and the third sub-pixel region, and an electron injection layer is formed on the electron transport layer at positions corresponding to the first sub-pixel region, the second sub-pixel region and the third sub-pixel region.
- The method of claim 9, wherein the anode and the cathode are formed by an evaporation process; wherein, the anode is a reflecting electrode, and the cathode is a semi-penetrating semi-reflecting electrode.
- The method of claim 9, wherein the second and third single primary color filters are bonded to the cathode side away from the anode by an adhesive.
- The method of claim 9, wherein the first sub-pixel region, the second sub-pixel region, and the third sub-pixel region display different colors and correspond to one of three single primary colors of red, green, and blue, respectively.
- An OLED display structure comprising a plurality of pixels arranged in rows and columns, the pixels having a pixel structure according to any one of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2017/110560 WO2019090733A1 (en) | 2017-11-10 | 2017-11-10 | Oled display device pixel structure, preparation method and oled display structure |
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| US20040185300A1 (en) * | 2003-03-19 | 2004-09-23 | Eastman Kodak Company | White light-emitting OLED device having a blue light-emitting layer doped with an electron-transporting or a hole-transporting material or both |
| CN105428390A (en) * | 2015-12-28 | 2016-03-23 | 昆山国显光电有限公司 | Oled display structure and pixel structure thereof |
| CN106653809A (en) * | 2016-12-09 | 2017-05-10 | 安徽熙泰智能科技有限公司 | Semiconductor integrated OLED display and manufacturing method thereof |
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| CN104103672B (en) * | 2014-07-02 | 2017-02-15 | 京东方科技集团股份有限公司 | OLED (Organic Light Emitting Diode) unit and fabrication method thereof, OLED display panel and OLED display apparatus |
| JP2017059537A (en) * | 2015-09-17 | 2017-03-23 | Cbc株式会社 | White light-emitting organic el lighting system |
| CN106910760B (en) * | 2015-12-18 | 2019-08-27 | 昆山工研院新型平板显示技术中心有限公司 | The dot structure of OLED display, OLED display and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040185300A1 (en) * | 2003-03-19 | 2004-09-23 | Eastman Kodak Company | White light-emitting OLED device having a blue light-emitting layer doped with an electron-transporting or a hole-transporting material or both |
| CN105428390A (en) * | 2015-12-28 | 2016-03-23 | 昆山国显光电有限公司 | Oled display structure and pixel structure thereof |
| CN106653809A (en) * | 2016-12-09 | 2017-05-10 | 安徽熙泰智能科技有限公司 | Semiconductor integrated OLED display and manufacturing method thereof |
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