CN114725299A - Display substrate, manufacturing method thereof, display panel and display device - Google Patents

Display substrate, manufacturing method thereof, display panel and display device Download PDF

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Publication number
CN114725299A
CN114725299A CN202210345582.1A CN202210345582A CN114725299A CN 114725299 A CN114725299 A CN 114725299A CN 202210345582 A CN202210345582 A CN 202210345582A CN 114725299 A CN114725299 A CN 114725299A
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layer
electrode
light
electrode block
light emitting
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王琳琳
尤娟娟
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to CN202210345582.1A priority Critical patent/CN114725299A/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
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H10K50/813—Anodes characterised by their shape
    • 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
    • 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
    • H10K59/1201—Manufacture or treatment
    • 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
    • H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
    • 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]

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The present disclosure provides a display substrate, a manufacturing method thereof, a display panel and a display device, wherein the display substrate includes: driving the back plate; the first electrode layer is arranged on one side of the driving back plate and at least comprises a plurality of electrode blocks which are arranged in an array mode, the plurality of electrode blocks comprise first electrode blocks and second electrode blocks, and the thickness of each first electrode block is smaller than that of each second electrode block; the light-emitting material layer covers the electrode block and is of a continuous whole-layer structure; a second electrode layer covering the light emitting material layer; the color film layer is arranged on one side, away from the driving back plate, of the second electrode layer and comprises a green first filter area and a red second filter area, the orthographic projection of the first filter area on the driving back plate is at least partially overlapped with the orthographic projection of the first electrode block on the driving back plate, and the orthographic projection of the second filter area on the driving back plate is at least partially overlapped with the orthographic projection of the second electrode block on the driving back plate. The display substrate can realize high color gamut display and reduce display power consumption.

Description

Display substrate, manufacturing method thereof, display panel and display device
Technical Field
The disclosure relates to the field of display technologies, and in particular, to a display substrate, a manufacturing method thereof, a display panel, and a display device.
Background
In the art, the requirement of a display substrate to achieve a high display color gamut requires that the display substrate be capable of emitting greener and redder green light.
However, the conventional display substrate cannot meet the requirement of high color gamut and the requirement of reducing display power consumption while displaying in high color gamut.
It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure and therefore may include information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to overcome the above-mentioned deficiencies in the prior art, and provides a display substrate, a method for manufacturing the same, a display panel and a display device. The display substrate can realize high color gamut display, and can reduce display power consumption while realizing high color gamut display.
According to a first aspect of the present disclosure, there is provided a display substrate comprising:
driving the back plate;
the first electrode layer is arranged on one side of the driving back plate and at least comprises a plurality of electrode blocks which are arranged in an array mode, the plurality of electrode blocks comprise first electrode blocks and second electrode blocks, and the thickness of each first electrode block is smaller than that of each second electrode block;
the light-emitting material layer covers the electrode block and is of a continuous whole-layer structure;
a second electrode layer covering the light emitting material layer;
the color film layer is arranged on one side, deviating from the driving backboard, of the second electrode layer and comprises a green first filter area and a red second filter area, the orthographic projection of the first filter area on the driving backboard is at least partially overlapped with the orthographic projection of the first electrode block on the driving backboard, and the orthographic projection of the second filter area on the driving backboard is at least partially overlapped with the orthographic projection of the second electrode block on the driving backboard.
In an exemplary embodiment of the present disclosure, the color film layer further includes: a third filter region of blue and a fourth filter region of white;
the electrode block further includes: the thickness of the third electrode block and the thickness of the fourth electrode block are the same as the thickness of the second electrode block;
the orthographic projection of the third filter area on the driving back plate is at least partially overlapped with the orthographic projection of the third electrode block on the driving back plate, and the orthographic projection of the fourth filter area on the driving back plate is at least partially overlapped with the orthographic projection of the fourth electrode block on the driving back plate.
In an exemplary embodiment of the present disclosure, the thickness of the first electrode block and the thickness of the second electrode block satisfy a first relationship:
1.1λB–0.8λG-20≥H2-H1≥1.1λB–0.8λG-30；
wherein H1Is the thickness of the first electrode block, H2Is the thickness, lambda, of the second electrode blockBA wavelength of blue light; lambda [ alpha ]GThe wavelength of green light.
In one exemplary embodiment of the present disclosure, the first electrode layer and the light emitting material layer satisfy a fourth resonant cavity for blue light.
In one exemplary embodiment of the present disclosure, the light emitting material layer includes a plurality of light emitting layers stacked in a direction away from the driving backplane, each of the light emitting layers including a hole transport layer, a light emitting functional layer, and an electron transport layer stacked in a direction away from the driving backplane;
the plurality of light emitting layers include a first light emitting layer, a second light emitting layer, and a third light emitting layer, the second light emitting layer is positioned between the first light emitting layer and the second light emitting layer, and the light emitting functional layer of the second light emitting layer has a yellow sub light emitting functional layer and a red sub light emitting functional layer, and the thickness of the yellow sub light emitting functional layer is greater than that of the red sub light emitting functional layer.
In one exemplary embodiment of the present disclosure, the light emission functional layer of the first light emission layer is a blue light emission functional layer, and the thickness of the hole transport layer of the first light emission layer is greater than the thickness of the hole transport layer of the second light emission layer.
In one exemplary embodiment of the present disclosure, the light emitting functional layer of the third light emitting layer is a blue light emitting functional layer, and the thickness of the hole transport layer of the third light emitting layer is less than the thickness of the hole transport layer of the second light emitting layer.
In a second aspect of the present disclosure, a method for manufacturing a display substrate is provided, including:
forming a driving back plate;
forming at least a plurality of electrode blocks arranged in an array on one side of the driving back plate to form a first electrode layer, wherein the plurality of electrode blocks comprise a first electrode block and a second electrode block, so that the thickness of the first electrode block is smaller than that of the second electrode block;
forming a luminescent material layer, covering the electrode block and enabling the luminescent material layer to be in a continuous whole-layer structure;
forming a second electrode layer and covering the light-emitting material layer;
forming a color film layer on one side of the second electrode layer, which is far away from the driving back plate;
the color film layer comprises a first green filter area and a second red filter area, the orthographic projection of the first filter area on the driving backboard is at least partially overlapped with the orthographic projection of the first electrode block on the driving backboard, and the orthographic projection of the second filter area on the driving backboard is at least partially overlapped with the orthographic projection of the second electrode block on the driving backboard.
A third aspect of the present disclosure provides a display panel comprising the display substrate of any one of the above.
A fourth aspect of the present disclosure provides a display device including the display panel described above.
The technical scheme provided by the disclosure can achieve the following beneficial effects:
the display substrate provided by the present disclosure has a driving back plate, a first electrode layer, a light emitting material layer, a second electrode layer and a color film layer. The first electrode layer at least comprises a plurality of electrode blocks arranged in an array, and the plurality of electrode blocks can comprise a first electrode block and a second electrode block. The thickness of the first electrode block may be less than the thickness of the second electrode block. The color film layer may include a first filter region of green and a second filter region of red. The orthographic projection of the green first filter region on the driving back plate is at least partially overlapped with the orthographic projection of the first electrode block on the driving back plate, so that light correspondingly emitted by the first electrode block can be green light; the orthographic projection of the red second filter region on the driving back plate is at least partially overlapped with the orthographic projection of the second electrode block on the driving back plate, so that the light correspondingly emitted by the second electrode block can be red.
Because the thickness of this first electrode piece that disclosure provided is less than the thickness of second electrode piece to make the transmissivity of first electrode piece be greater than the transmissivity of second electrode piece, and then make the luminous efficiency and the luminance of green light bigger, just also can improve the colour gamut scope of display substrate, make this display substrate that disclosure provided satisfy the demand of high colour gamut.
And, since the luminous efficiency and brightness of red light itself are higher than those of green light itself, the red light can be ensured to have higher luminous efficiency and brightness even if the thickness of the second electrode block is greater than that of the first electrode block. Therefore, the display substrate provided by the present disclosure can make the light emitting efficiency and the brightness of green light and red light higher, and can reduce the requirement for HDR (High Dynamic Range Imaging), thereby significantly reducing the power consumption of the display.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 illustrates a schematic structural diagram of a display substrate according to an embodiment of the present disclosure;
FIG. 2 shows a schematic structural diagram of a driving back plate according to an embodiment of the present disclosure;
FIG. 3 shows a schematic structural diagram of a substrate according to an embodiment of the present disclosure;
FIG. 4 shows a schematic structural diagram of a layer of light emitting material according to an embodiment of the present disclosure;
FIG. 5 shows a schematic structural diagram of a display substrate according to another embodiment of the present disclosure;
FIG. 6 is a graph illustrating the intensity and wavelength response of blue light emitted from a display substrate according to one embodiment of the present disclosure;
FIG. 7 is a diagram illustrating the intensity and wavelength response of red light emitted by a display substrate according to an embodiment of the disclosure;
FIG. 8 is a graph illustrating light intensity and wavelength correspondence of green light emitted by a display substrate according to an embodiment of the disclosure;
FIG. 9 is a graph illustrating intensity and wavelength correspondence of white light emitted by a display substrate according to an embodiment of the disclosure;
FIG. 10 is a schematic flow chart illustrating a method of fabricating a display substrate according to an embodiment of the present disclosure;
fig. 11 shows a schematic flow chart of a method for manufacturing a display substrate according to another embodiment of the present disclosure.
Description of reference numerals:
1. driving the back plate; 2. a first electrode layer; 3. a light emitting material layer; 4. a second electrode layer; 5. a color film layer; 6. a pixel defining layer; 11. a substrate; 12. a drive layer; 21. a first electrode block; 22. a second electrode block; 23. a third electrode block; 24. a fourth electrode block; 31. a first light-emitting layer; 32. a second light emitting layer; 33. a third light emitting layer; 51. a first filtering area; 52. a second light filtering area; 53. a third light filtering area; 54. a fourth light filtering area; 55. a light-shielding area; 111. a first protective layer; 112. a first barrier layer; 113. a first buffer layer; 114. a second protective layer; 115. a second barrier layer; 121. an active layer; 122. a first gate insulating layer; 123. a gate electrode; 124. a second gate insulating layer; 125. an interlayer dielectric layer; 126. a first source drain layer; 127. a passivation layer; 128. a first planar layer; 129. a second source drain layer; 130. a second planar layer; 311. a hole injection layer of the first light emitting layer; 312. a hole transport layer of the first light emitting layer; 313. an electron blocking layer of the first light emitting layer; 314. a light-emitting functional layer of the first light-emitting layer; 315. a hole blocking layer of the first light emitting layer; 316. an electron transport layer of the first light emitting layer; 317. an electron injection layer of the first light emitting layer; 321. a hole injection layer of the second light emitting layer; 322. a hole transport layer of the second light emitting layer; 323. an electron blocking layer of the second light emitting layer; 324. a light emitting functional layer of the second light emitting layer; 325. a hole blocking layer of the second light emitting layer; 326. an electron transport layer of the second light emitting layer; 327. an electron injection layer of the second light emitting layer; 331. a hole injection layer of the third light emitting layer; 332. a hole transport layer of the third light emitting layer; 333. an electron blocking layer of the third light emitting layer; 334. a light emitting functional layer of the third light emitting layer; 335. a hole blocking layer of the third light emitting layer; 336. an electron transport layer of the third light emitting layer; 3241. a yellow photon luminescence functional layer; 3242. and a red sub-luminescence functional layer.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a detailed description thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.
Display devices having a large size are becoming mainstream in the field of display technology and daily life needs. However, when the display device is large in size, the size of the display substrate required for the display device is also large. The larger dimension referred to herein may be, but is not limited to, a dimension greater than 85 inches. In order to ensure that the display substrate with a larger size can have a better display effect, a higher requirement is put on the color gamut range of the display substrate. Namely: the display substrate needs to meet the display requirements of high color gamut. The high gamut as used herein refers to: the color gamut of the display substrate can reach 72% under the NTSC color gamut standard, or can approach 100% under the DCI-P3 color gamut standard, or approach 100% under the sRGB color gamut standard, and the like.
However, after conducting a great deal of research on the conventional display substrate, the inventors of the present disclosure found that the conventional display substrate cannot satisfy the above-mentioned display requirement of high color gamut. Moreover, when the display substrate increases the color gamut of the display, green light and red light need to be made greener and redder, which deviate from the wavelength band with the highest brightness, so the overall power consumption is relatively high. In the conventional display substrate, because the green light emitting functional layer and the red light emitting functional layer are evaporated together, in order to improve the color gamut of the display as much as possible, improve the luminance of green light and reduce the luminance of red light, the display of the display substrate needs to be adjusted by means of HDR, so that the power consumption of the display is significantly increased.
In order to solve the above-mentioned technical problems found by the inventors, the inventors spent a lot of time and, after a lot of creative work, provided a new display substrate. The display substrate can realize high color gamut display, and can reduce display power consumption while realizing high color gamut display.
As shown in fig. 1, the display substrate may include: the driving back plate 1, the first electrode layer 2, the luminescent material layer 3, the second electrode layer 4 and the color film layer 5.
The driving back plate 1 may be provided with a driving circuit, and the driving circuit may be connected to the first electrode layer 2 to drive the first electrode layer 2, the light emitting material layer 3, and the second electrode layer 4 to operate and emit light. Specifically, the driving backplane 1 may include a display area for displaying an image, or may include a peripheral area located outside the display area. It should be noted that the driving backplane 1 may not include the peripheral area, that is: the driving backplane 1 may also have only a display area.
The driving circuit may include a pixel circuit and may also include a peripheral circuit. The pixel circuit may be disposed in the display area, and may be a pixel circuit such as 7T1C, 7T2C, 6T1C, or 6T2C, and the specific type of the pixel circuit is not limited in this disclosure, and may be selected according to actual needs as long as the first electrode layer 2, the light-emitting material layer 3, and the second electrode layer 4 can be driven to operate and emit light, which is within the protection scope of this disclosure.
In one embodiment of the present disclosure, the number of pixel circuits may be the same as the number of electrode blocks in the first electrode layer 2, and the electrode blocks are connected in a one-to-one correspondence to control the operation of the electrode blocks.
A peripheral circuit may be provided in the peripheral region, and the peripheral circuit may be connected to the pixel circuit for inputting a driving signal to the pixel circuit so as to control the operations of the first electrode layer 2, the light emitting material layer 3, and the second electrode layer 4. The specific structure of the peripheral circuit is not particularly limited in the present disclosure, and may be set according to actual conditions, which are within the protection scope of the present disclosure.
The driving backplate 1 may be formed of a plurality of film layers. Specifically, as shown in fig. 2 and 5, the driving backplate 1 may include a substrate 11 and a driving layer 12 disposed on one side of the substrate 11. The substrate 11 may be a single-layer structure or a multi-layer structure, and it may be a hard or flexible structure. For example, when the substrate 11 has a single-layer structure, the material thereof may be glass, but is not limited thereto, and when the substrate 11 has a multi-layer structure, as shown in fig. 3 and 5, the substrate may include a first protective layer 111, a first barrier layer 112, a first buffer layer 113, a second protective layer 114, and a second barrier layer 115, which are sequentially stacked.
The material of the first protective layer 111 and the second protective layer 114 may be PI (polyimide), but is not limited thereto, and the material of the first protective layer 111 and the second protective layer 114 may also be other materials having protection and support properties. The material of the first buffer layer 113 may be a-Si, but is not limited thereto, and the material of the first buffer layer 113 may also be IGZO (indium tin oxide) or the like, and may be selected according to actual needs, which is within the protection scope of the present disclosure.
As shown in fig. 2 and fig. 5, the driving circuit may be located in the driving layer 12, and taking a transistor in the driving circuit as an example, the driving layer 12 may include: an active layer 121, a first gate insulating layer 122, a gate electrode 123, a second gate insulating layer 124, an interlayer dielectric layer 125, a first source drain layer, and a passivation layer 127.
Wherein the active layer 121 may be disposed on the substrate 11, and when the substrate 11 has a multi-layer structure, the active layer 121 may be positioned on the second blocking layer 115. In an embodiment of the present disclosure, a second buffer layer may be further disposed between the second barrier layer 115 and the active layer 121, and the material of the second buffer layer is not limited by the present disclosure, and may be disposed according to practical situations, which is within the protection scope of the present disclosure.
The first gate insulating layer 122 may cover the active layer 121; the gate electrode 123 may be disposed on a side of the first gate insulating layer 122 facing away from the substrate 11, and an orthographic projection of the gate electrode 123 on the substrate 11 may at least partially overlap with an orthographic projection of the active layer 121 on the substrate 11; the second gate insulating layer 124 may cover the gate electrode 123 and the first gate insulating layer 122; the interlayer dielectric layer 125 may cover the second gate insulating layer 124.
The first source-drain layer 126 may be disposed on a surface of the interlayer dielectric layer 125 facing away from the substrate 11, and the first source-drain layer 126 may include a source and a drain, which may be connected to the active layer 121. For example, through holes may be opened in the first gate insulating layer 122, the second gate insulating layer 124 and the interlayer dielectric layer 125, and the source and the drain may be connected to the active layer 121 through the through holes, but the present disclosure is not limited thereto, and the source and the drain may also be connected to the active layer 121 without opening through holes, as long as the source and the drain can be electrically connected to the active layer 121, and the present disclosure may be set according to actual needs, which is within the protection scope of the present disclosure. A passivation layer 127 may cover the first source-drain layer 126 and the interlayer dielectric layer 125.
In one embodiment of the present disclosure, in order to planarize the driving backplate 1 for facilitating the deposition of subsequent film layers, the driving backplate 1 may further include: a first planar layer 128. The first planarization layer 128 may cover the passivation layer 127.
In addition, in one embodiment of the present disclosure, the driving back plate 1 may further include: and a second source drain layer 129. The second source-drain layer 129 may be disposed on a side of the first planarization layer 128 facing away from the substrate 11, and may be connected to the first source-drain layer 126. For example, a via hole may be opened in the passivation layer 127 and be enabled to expose the first active layer 121. The second source/drain layer 129 may be connected to the first source/drain layer 126 through the through hole, but is not limited thereto, and the second source/drain layer 129 may be connected to the first source/drain layer 126 without forming a through hole, as long as it can be electrically connected, and may be set according to actual needs, which are all within the protection scope of the present disclosure.
According to the driving back plate 1, the second source drain layer 129 is arranged, and the second source drain layer 129 is connected with the first source drain layer 126, so that the resistance of the driving back plate 1 can be effectively reduced, and power consumption can be saved. In addition, the second source-drain layer 129 can simplify the wiring of the circuit, and the problem that the wiring is too complicated when the circuit is connected with the first source-drain layer 126 is solved.
In addition, in order to planarize the driving backplate 1 when the second source drain layer 129 is disposed, and facilitate deposition of a subsequent film layer, the driving backplate 1 provided in the present disclosure may further include: a second planar layer 130. The second planarization layer 130 may cover the second source-drain layer 129 and the first planarization layer 128.
The first electrode layer 2 may be disposed on one side of the driving backplate 1, and the driving backplate 1 may at least include a plurality of electrode blocks arranged in an array. It can be understood that: the first electrode layer 2 may be arranged on a side of the first planar layer 128 facing away from the substrate 11. Namely: a plurality of electrode blocks may be arranged on a side of the first planar layer 128 facing away from the substrate 11. Also, a plurality of electrode blocks may be connected to the first source-drain layer 126 to be able to receive signals provided from the first source-drain layer 126.
In an embodiment of the present disclosure, when the driving back plate 1 has the second source drain layer 129 and the second planarization layer 130, the first electrode layer 2 may be disposed on a side of the second planarization layer 130 facing away from the substrate 11, that is, a plurality of electrode blocks are disposed on a side of the second planarization layer 130 facing away from the substrate 11. Also, a plurality of electrode blocks may be connected to the second source-drain layer 129 to be able to receive signals supplied from the second source-drain layer 129.
As shown in fig. 1 and 5, in one embodiment of the present disclosure, the first electrode layer 2 may be an anode layer, and the electrode block may be an anode block. The electrode block can be a single-layer or multi-layer structure, and the material of the electrode block can be one or more of conductive metal, metal oxide and alloy. For example: the material of the electrode block can be ITO (tin oxide), silver, etc., and can be selected according to actual needs, which is within the protection scope of the present disclosure.
In an embodiment of the present disclosure, as shown in fig. 2 and fig. 5, a plurality of first source-drain layers 126 may be disposed on the driving backplane 1, and each electrode block may be connected to one first source-drain layer 126, so that each electrode block may be independently controlled by the first source-drain layers 126, and each electrode block may work independently.
In another embodiment of the present disclosure, as shown in fig. 2 and fig. 5, a plurality of second source drain layers 129 are disposed on the driving backplane 1, and each electrode block may be connected to one second source drain layer 129, so that each electrode block may be independently controlled by the second source drain layer 129, and each electrode block may work independently.
In one embodiment of the present disclosure, as shown in fig. 1 and 5, the plurality of electrode blocks may include a first electrode block 21 and a second electrode block 22. Wherein the thickness of the first electrode block 21 is smaller than the thickness of the second electrode block 22. Since the transmittance of the electrode block is higher when the thickness of the electrode block is smaller; the greater the thickness of the electrode block, the smaller its transmittance. Therefore, when the thickness of the first electrode block 21 is smaller than that of the second electrode block 22, the transmittance of the first electrode block 21 can be made larger.
As shown in fig. 1 and 5, the above-mentioned luminescent material layer 3 may cover the electrode block, and the luminescent material layer 3 may be in a whole layer structure. Namely: the luminescent material is a continuous, uninterrupted structure that may completely cover all of the electrode blocks in a full layer. The light emitting material layer 3 may include a plurality of light emitting layers stacked in a direction away from the driving backplate 1, and each light emitting layer may include a hole transport layer, a light emitting functional layer, and an electron transport layer stacked in a direction away from the driving backplate 1. Thus, the present disclosure may cause holes and electrons to be recombined into excitons in the light emitting material layer 3 through the light emitting material layer 3, and thus may generate visible light since the excitons may radiate photons. It should be noted that the present disclosure does not describe in detail the specific light emitting principle of the light emitting material layer 3.
In one embodiment of the present disclosure, each light emitting layer may further include a hole injection layer and an electron injection layer. Wherein a hole injection layer may be located between the first electrode layer 2 and the hole transport layer; the electron injection layer may be located on the side of the electron transport layer facing away from the driving backplane 1.
Moreover, in order to enable the light emitting material layer 3 to have a better light emitting effect, each light emitting layer provided by the present disclosure may further include: an electron blocking layer and a hole blocking layer. Wherein the electron blocking layer may be positioned between the hole transport layer and the light emitting functional layer; the hole blocking layer may be positioned between the light emitting functional layer and the electron transport layer.
In one embodiment of the present disclosure, the display substrate may further include a pixel defining layer 6, the pixel defining layer 6 may be disposed at one side of the driving backplate 1, and the pixel defining layer 6 may have a plurality of openings, and the plurality of openings may expose the driving backplate 1. Each electrode block may be located in a respective opening of the pixel defining layer 6, i.e.: an electrode block is positioned in an opening, and the orthographic projection of the electrode block on the driving back plate 1 is positioned in the orthographic projection of the opening on the driving back plate 1. Thus, when the display substrate provided by the present disclosure is provided with the pixel defining layer 6, the light emitting material layer 3 may cover the electrode blocks and a portion of the pixel defining layer 6.
The shape of the opening in the pixel definition layer 6 is not limited in the present disclosure, and the shape of the orthographic projection of the opening on the driving back plate 1 may be a polygon, a smooth closed curve, or other shapes, such as: circular, square, oval, etc., and the selection is not limited herein and can be made according to actual needs.
The second electrode layer 4 may cover the light emitting material layer 3. In one embodiment of the present disclosure, the second electrode layer 4 may be a cathode. The second electrode layer 4 may be a single-layer or multi-layer structure, and the material thereof may be one or more of conductive metal, metal oxide and alloy. For example: the material of the second electrode layer 4 may be ITO (tin oxide), aluminum, magnesium, etc., and may be selected according to actual needs, which is within the protection scope of the present disclosure.
In one embodiment of the present disclosure, the second electrode layer 4 is a full layer structure. I.e. all light emitting devices share one second electrode. It should be noted that the light-emitting device described herein includes: a first electrode layer 2, a layer of light emitting material 3 and a second electrode. Without limitation, the second electrode layer 4 may not be a whole layer structure, and may be set according to actual needs, which is within the protection scope of the present disclosure.
In one embodiment of the present disclosure, the thickness of the second electrode layer 4 may be 800A to 1500A. Through setting up the thickness of second electrode layer 4 in this numerical range, can make second electrode layer 4 better to the transmission and reflection effect performance of light, and then can make whole display substrate's display effect better. But not limited thereto, the thickness of the second electrode layer 4 may not be within this numerical range, and may be selected according to actual needs.
The color film layer 5 may be disposed on a side of the second electrode layer 4 away from the driving back plate 1, and the color film layer 5 may include a first green filter region 51 and a second red filter region 52. The first filter area 51 for green can be used to transmit green light, and the second filter area 52 for red can be used to transmit red light. The orthographic projection of the green first filter region 51 on the driving back plate 1 may at least partially overlap the orthographic projection of the first electrode block 21 on the driving back plate 1, and therefore, the present disclosure may enable the light emitted by the first electrode block 21 correspondingly to be green light. The orthographic projection of the red second filter region 52 on the driving back plate 1 is at least partially overlapped with the orthographic projection of the second electrode block 22 on the driving back plate 1, and thus, the light correspondingly emitted by the second electrode block 22 can be red according to the present disclosure.
The at least partial overlap mentioned here means that the orthographic projection of the green first filter region 51 on the driving backplate 1 can be completely overlapped or partially overlapped with the orthographic projection of the first electrode block 21 on the driving backplate 1; the orthographic projection of the red second filter region 52 on the driving back plate 1 is completely overlapped or partially overlapped with the orthographic projection of the second electrode block 22 on the driving back plate 1.
As can be seen from the above, since the thickness of the first electrode block 21 provided by the present disclosure is smaller than the thickness of the second electrode block 22, the transmittance of the first electrode block 21 is greater than that of the second electrode block 22, and further, the green light emitting efficiency and the luminance are greater, and the color gamut range of the display substrate can be further improved, so that the display substrate provided by the present disclosure meets the requirement of high color gamut.
Also, since the luminous efficiency and brightness of red light itself are higher than those of green light itself, it is possible to ensure that red light can have higher luminous efficiency and brightness even if the thickness of the second electrode block 22 is greater than that of the first electrode block 21. Therefore, the display substrate provided by the present disclosure can make the luminous efficiency and the brightness of green light and red light higher, and can also reduce the requirement for HDR, thereby significantly reducing the power consumption of the display.
In one embodiment of the present disclosure, the color film layer 5 may further include: a third filter 53 for blue and a fourth filter 54 for white. The first blue filter area 51 can be used for transmitting blue light, and the second white filter area 52 can be used for transmitting white light.
In this embodiment, the electrode block may further include: a third electrode block 23 and a fourth electrode block 24. Wherein the thickness of the third electrode block 23 may be the same as the thickness of the fourth electrode block 24. In addition, the thickness of the third electrode block 23 and the thickness of the fourth electrode block 24 may be the same as the thickness of the second electrode block 22, so that the first electrode layer 2 may have two thicknesses, thereby simplifying the difficulty in manufacturing the first electrode layer 2.
In addition, the thickness of the third electrode block 23 and the thickness of the fourth electrode block 24 may be the same as the thickness of the first electrode block 21, and the first electrode layer 2 may have two thicknesses, so that the difficulty of manufacturing the first electrode layer 2 may be simplified.
But not limited thereto, the thickness of the third electrode block 23 and the thickness of the fourth electrode block 24 may be different, and the thickness of the third electrode block 23 and the thickness of the fourth electrode block 24 may not be the same as the first electrode block 21 and the second electrode block 22, and may be selected according to actual needs, which is within the protection scope of the present disclosure.
In this embodiment, the thickness of the first electrode block 21, the thickness of the second electrode block 22, the thickness of the third electrode block 23, and the thickness of the fourth electrode block 24 may all be less than 1500A, so as to ensure absorption and transmittance of each electrode block, and further ensure that the display panel has a good display effect and can have a higher color gamut range.
In this embodiment, the orthographic projection of the blue third filter region 53 on the driving backplane 1 may at least partially overlap with the orthographic projection of the third electrode block 23 on the driving backplane 1, so that the light emitted by the third electrode block 23 is blue light. The orthographic projection of the white fourth filter region 54 on the driving backplane 1 may partially overlap with the orthographic projection of the fourth electrode block 24 on the driving backplane 1, and therefore the present disclosure may make the light emitted by the fourth electrode block 24 correspondingly be white light.
The meaning of at least partial overlap as referred to herein is the same as that of the above-mentioned at least partial overlap, and the explanation of the at least partial overlap can be referred to.
In an embodiment of the disclosure, the color film layer 5 may further include a light-shielding region 55, and the light-shielding region 55 may be located between adjacent filter regions. And, the projection of the light shielding region 55 on the driving back plate 1 may be located between the projections of the two adjacent electrode blocks on the driving back plate 1. The light-shielding region 55 may be made of a light-shielding material, such as: the material of the light-shielding region 55 may be a black resin material or the like. The problem that the display effect of the display substrate is poor due to the mixed color of two adjacent color lights can be prevented by arranging the light shielding region 55.
In one embodiment of the present disclosure, the thickness of the first electrode block 21 and the thickness of the second electrode block 22 may satisfy a first relationship, which may be:
1.1λB–0.8λG-20≥H2-H1≥1.1λB–0.8λG-30；
wherein H1Is the thickness of the first electrode block 21, H2Is the thickness, λ, of the second electrode block 22BIs the wavelength of the blue light; lambda [ alpha ]GIs the wavelength of the green light.
When the thickness of the first anode block and the thickness of the second anode block satisfy a first relation, the cavity length of the resonant cavity of the display substrate can satisfy:
λG/2n*m
wherein λ isGN is the refractive index and m is a natural number (1, 2, 3, 4 … …) for the wavelength of the green light.
When the cavity length of the resonant cavity of the display substrate satisfies lambdaGAnd when the brightness of the green light reaches the maximum value,/2 n × m, the light extraction efficiency and the brightness of the green light can be optimized, and further, the color gamut range of the display substrate can be larger, so that high-color-gamut display can be realized.
In one embodiment of the present disclosure, the first electrode layer 2 and the light emitting material layer 3 satisfy a fourth resonant cavity for blue light. Namely: the first electrode layer 2 and the light emitting material layer 3 may form a resonant cavity, and when the thicknesses of the first electrode layer 2 and the light emitting material layer 3 are adjusted to enable blue light to resonate four times in the first electrode layer 2 and the light emitting material layer 3 in one period, the resonant cavity is referred to as a fourth resonant cavity. It is understood that the sum of the thickness of the first electrode layer 2 and the thickness of the luminescent material layer 3 is required to satisfy the fourth resonant cavity for blue light, and the sum of the thicknesses thereof can generate four times of resonance for blue light. In one embodiment of the present disclosure, the sum of the thickness of the first electrode layer 2 and the thickness of the light emitting material layer 3 may be
Figure BDA0003576425500000141
When the first electrode layer 2 and the luminescent material layer 3 satisfy the fourth resonant cavity of blue light, the luminous efficiency and the brightness of the blue light can be higher, and then the color gamut range of the display substrate can be larger, and the requirement that the display substrate performs high-color gamut display can be satisfied.
In one embodiment of the present disclosure, as shown in fig. 3 and 5, the plurality of light emitting layers may include: a first light-emitting layer 31, a second light-emitting layer 32, and a third light-emitting layer 33. Wherein the second light emitting layer 32 may be positioned between the first light emitting layer 31 and the third light emitting layer 33.
Since each of the light emitting layers may have a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting functional layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The light emitting material layer 3 provided by the present disclosure may have twenty-one film layers, and in addition, the first electrode layer 2 and the second electrode layer 4 may be twenty-three film layers in total.
The twenty-three film layers may be: a first electrode layer 2, a hole injection layer 311 of the first light-emitting layer, a hole transport layer 312 of the first light-emitting layer, an electron blocking layer 313 of the first light-emitting layer, a light-emitting functional layer 314 of the first light-emitting layer, a hole blocking layer 315 of the first light-emitting layer, an electron transport layer 316 of the first light-emitting layer, an electron injection layer 317 of the first light-emitting layer, a hole injection layer 321 of the second light-emitting layer, a hole transport layer 322 of the second light-emitting layer, an electron blocking layer 323 of the second light-emitting layer, a light-emitting functional layer 324 of the second light-emitting layer, a hole blocking layer 325 of the second light-emitting layer, an electron transport layer 326 of the second light-emitting layer, an electron injection layer 327 of the second light-emitting layer, a hole injection layer 331 of the third light-emitting layer, a hole transport layer 332 of the third light-emitting layer, an electron blocking layer 333 of the third light-emitting layer, a light-emitting functional layer 334 of the third light-emitting layer, a hole blocking layer 335 of the third light-emitting layer, an electron transport layer 336 of the third light-emitting layer, A second electrode layer 4.
However, the third light emitting layer 33 may not be provided with an electron injection layer because it is adjacent to the second electrode layer 4, but is not limited thereto, and the third light emitting layer 33 may also be provided with an electron injection layer, which is within the protection scope of the present disclosure.
In addition, the light emitting function layer 324 of the second light emitting layer may have two film layers. Namely: the light emitting functional layer 324 of the second light emitting layer may have a yellow sub-light emitting functional layer 3241 and a red sub-light emitting functional layer 3242. Thus, the light-emitting functional layer 324 of the second light-emitting layer may be a co-evaporated layer of the yellow sub-light-emitting functional layer 3241 and the red sub-light-emitting functional layer 3242. It is understood that the light emitting functional layer 324 of the second light emitting layer can emit yellow light and red light, and after the yellow light passes through the first filter region 51 of green color in the color film layer 5, the yellow light can be converted into green light and emitted.
In this embodiment, the thickness of the yellow sub-emission functional layer 3241 may be greater than that of the red sub-emission functional layer 3242, so that the emission composite region of the emission functional layer 324 of the second emission layer is closer to yellow light, and the efficiency and brightness of yellow light can be further improved, and the emission efficiency and brightness of the finally emitted green light can be further improved, so as to further enlarge the color gamut range of the display substrate.
In one embodiment of the present disclosure, the light emission functional layer 314 of the first light emission layer may be a blue light emission functional layer. In addition, the thickness of the hole transport layer 312 of the first light emitting layer may be greater than the thickness of the hole transport layer 322 of the second light emitting layer, so that the light emitting efficiency and brightness of yellow light and the light emitting efficiency and brightness of blue light can be ensured to be stronger.
Further, the light-emitting functional layer 334 of the third light-emitting layer of the present disclosure may be a blue light-emitting functional layer. The thickness of the hole transport layer 332 of the third light emitting layer may be smaller than that of the hole transport layer 322 of the second light emitting layer, so as to further ensure that yellow light has stronger luminous efficiency and brightness, and the color gamut of the display substrate is wider.
In one embodiment of the present disclosure, the thickness of the hole transport layer 312 of the first light emitting layer may range from 600A to 1300A, the thickness of the hole transport layer 322 of the second light emitting layer may range from 400A to 800A, and the thickness of the hole transport layer 332 of the third light emitting layer may range from 50A to 200A, but is not limited thereto.
In addition, the present disclosure can adjust the position of the anti-node of each color light by adjusting the thickness of each film layer. The present disclosure may cause the light emitting function layer in the first light emitting layer 31 to have a first distance from the second electrode layer 4, and the first distance may be a third anti-node of blue light. The first distance may be
Figure BDA0003576425500000151
In the present embodiment, the light emitting function layer in the second light emitting layer 32 may be spaced from the second electrode layer 4 by a second distance, which may be a second anti-node of yellow light. The second distance may be
Figure BDA0003576425500000161
In this embodiment, the first stepThe light emitting function layers in the three light emitting layers 33 have a third distance from the second electrode layer 4, and the third distance may be a first anti-node of blue light. The third distance may be
Figure BDA0003576425500000162
When the first distance, the second distance and the third distance are within the numerical range, the luminous efficiency and the brightness of blue light and the luminous efficiency and the brightness of yellow light are high, and the color gamut range of the display substrate is large.
In addition, as shown in fig. 6 to 9, when the wavelength corresponding to the peak value of the emission intensity of the blue light in the display substrate is 458nm to 460nm, the wavelength corresponding to the peak value of the emission intensity of the green light is 550nm to 555nm, and the wavelength corresponding to the peak value of the emission intensity of the red light is 608nm to 612nm, the color gamut range of the display panel can be maximized.
The inventors of the present disclosure conducted tests on the display substrate described above. The test result shows that the wavelength corresponding to the peak value of the luminous intensity of the blue light, the wavelength corresponding to the peak value of the luminous intensity of the green light and the wavelength corresponding to the peak value of the luminous intensity of the red light in the display substrate are both in the wavelength range, and therefore the wavelength corresponding to the intensity of the white light of the display panel can be in a better range. That is, the present disclosure provides a display substrate having a large gamut range.
After further tests, the color gamut range of the display substrate can reach more than 99.9% under the DCI-P3 color gamut standard, so that the display substrate completely meets the display requirement of high color gamut. And the HDR power consumption of the display substrate is always kept below 800W, and the W power consumption of the display substrate is always kept below 500W, so that the display substrate meets the display requirement of low power consumption.
A second aspect of the present disclosure provides a method of manufacturing a display substrate. The manufacturing method of the display substrate can be used for manufacturing the display substrate. The display substrate manufactured by the manufacturing method of the display substrate can realize high-color-gamut display, and can reduce display power consumption while realizing high-color-gamut display.
It should be noted that, in the detailed explanation of the manufacturing method of the display substrate, detailed descriptions are not given again to the specific structure, material, and technical effect of the display substrate, and reference may be made to the above detailed explanation of the display substrate for the specific structure, material, and technical effect of the display substrate.
As shown in fig. 1, 5 and 10, the method for manufacturing a display substrate may include:
step S10, forming the driving back plate 1.
Step S20, forming at least a plurality of electrode blocks arranged in an array on one side of the driving back plate 1 to form the first electrode layer 2, the plurality of electrode blocks including the first electrode block 21 and the second electrode block 22, such that the thickness of the first electrode block 21 is smaller than the thickness of the second electrode block 22.
Step S30 is to form the light emitting material layer 3, cover the electrode block, and make the light emitting material layer 3 be a continuous whole layer structure.
Step S40, forming the second electrode layer 4 and covering the light emitting material layer 3.
Step S50, forming a color film layer 5 on a side of the second electrode layer 4 away from the driving back plate 1.
Specifically, in step S10, one substrate 11 may be formed. When the substrate 11 has a multilayer structure, the first protective layer 111, the first barrier layer 112, the first buffer layer 113, the second protective layer 114, and the second barrier layer 115 may be sequentially stacked.
An active layer 121, a first gate insulating layer 122, a gate electrode 123, a second gate insulating layer 124, an interlayer dielectric layer 125, a first source-drain electrode layer, a passivation layer 127, and a first planarization layer 128 may be sequentially formed on one side of the substrate 11. Also, the first source drain layer may be connected to the active layer 121.
When the driving backplate 1 has the second source-drain layer 129, the second source-drain layer 129 may be formed on the side of the first planarization layer 128 facing away from the substrate 11, and the second source-drain layer 129 may be connected to the first source-drain layer 126. A second planarization layer 130 may be formed on the surface of the second source-drain layer 129 such that the second planarization layer 130 covers the second source-drain layer 129 and the first planarization layer 128.
In step S20, at least a plurality of electrode blocks arranged in an array may be formed on one side of the driving back plate 1 to form the first electrode layer 2, the plurality of electrode blocks including the first electrode block 21 and the second electrode block 22 such that the thickness of the first electrode block 21 is smaller than that of the second electrode block 22. In one embodiment of the present disclosure, the plurality of electrode blocks may be formed by sputtering, but is not limited thereto, and may be formed by other methods, which is also within the protection scope of the present disclosure.
In one embodiment of the present disclosure, the plurality of electrode blocks may further include a third electrode block 23 and a fourth electrode block 24, and in order to simplify the manufacturing difficulty of the first electrode layer 2, the thickness of the second electrode block 22, the thickness of the third electrode block 23, and the thickness of the fourth electrode block 24 may be the same. Or the thickness of the first electrode block 21, the thickness of the third electrode block 23, and the thickness of the fourth electrode block 24 may be made the same.
In step S30, the light emitting material layer 3 may be formed and the electrode block is covered such that the light emitting material layer 3 is a continuous whole layer structure. Specifically, the light emitting material layer 3 may include a first light emitting layer 31, a second light emitting layer 32, and a third light emitting layer 33. Each light emitting layer may include a hole transport layer, a light emitting functional layer, and an electron transport layer stacked in a direction away from the driving backplane 1. Each of the light-emitting layers may further include a hole injection layer, an electron blocking layer, a hole blocking layer, and an electron injection layer.
When each light-emitting layer includes the above-described film layers, a hole injection layer 311 of the first light-emitting layer, a hole transport layer 312 of the first light-emitting layer, an electron blocking layer 313 of the first light-emitting layer, a light-emitting functional layer 314 of the first light-emitting layer, a hole blocking layer 315 of the first light-emitting layer, an electron transport layer 316 of the first light-emitting layer, an electron injection layer 317 of the first light-emitting layer, a hole injection layer 321 of the second light-emitting layer, a hole transport layer 322 of the second light-emitting layer, an electron blocking layer 323 of the second light-emitting layer, a light-emitting functional layer 324 of the second light-emitting layer, a hole blocking layer 325 of the second light-emitting layer, an electron transport layer 326 of the second light-emitting layer, an electron injection layer 327 of the second light-emitting layer, a hole injection layer 331 of the third light-emitting layer, a hole transport layer 332 of the third light-emitting layer, an electron blocking layer 333 of the third light-emitting layer, a hole blocking layer, an electron blocking layer 333 of the first light-emitting layer, a hole blocking layer, and a hole blocking layer are sequentially formed on the driving backplane 1 side by vapor deposition method, A light emitting functional layer 334 of the third light emitting layer, a hole blocking layer 335 of the third light emitting layer, and an electron transport layer 336 of the third light emitting layer. However, the above film layers may not be formed by evaporation, which is merely an exemplary illustration, and different methods may be adopted according to actual needs, and all of them are within the protection scope of the present disclosure.
In step S40, the second electrode layer 4 may be formed and cover the light emitting material layer 3. Specifically, the second electrode layer 4 may be formed on the light emitting material layer 3 by vapor deposition, but the present invention is not limited thereto, and the second electrode layer 4 may be formed by another method.
In step S50, a color film layer 5 may be formed on a side of the second electrode layer 4 facing away from the driving back plate 1. The color film layer 5 may include a first filter area 51 of green and a second filter area 52 of red. The orthographic projection of the green first filter region 51 on the driving back plate 1 can be at least partially overlapped with the orthographic projection of the first electrode block 21 on the driving back plate 1. Also, the orthographic projection of the red second filter region 52 on the driving back plate 1 can be at least partially overlapped with the orthographic projection of the second electrode block 22 on the driving back plate 1.
In addition, the color film layer 5 may further include a third filter area 53 with blue color and a fourth filter area 54 with white color. The orthographic projection of the blue third filter region 53 on the driving backplane 1 may be made to at least partially overlap with the orthographic projection of the third electrode block 23 on said driving backplane 1. And, the orthographic projection of the white fourth filter region 54 on the driving backplate 1 can be at least partially overlapped with the orthographic projection of the fourth electrode block 24 on the driving backplate 1.
When the color film layer 5 is formed, the light-shielding region 55 may be formed first, and the orthographic projection of the light-shielding region 55 on the driving back plate 1 is located between the orthographic projections of the two adjacent electrode blocks on the driving back plate 1. After the light-shielding regions 55 are formed, the light-filtering regions 55 can be formed correspondingly. Without limitation, when forming a color film, the light-shielding region 55 and each of the filter regions may be formed simultaneously, which is within the scope of the present disclosure.
In addition, as shown in fig. 11, after step S20 and before step S30, the method for manufacturing a display substrate may further include:
step S60 is to form a pixel defining layer 6 on one side of the driving backplane 1, and make the pixel defining layer 6 have a plurality of openings, and make each opening expose the driving backplane 1, and make each electrode block located in each opening of the pixel defining layer 6.
Specifically, the material forming the pixel defining layer 6 may be deposited on one side of the driving backplane 1, and a plurality of openings may be etched. The material of the pixel defining layer 6 may be black photoresist, and the etching manner may be photolithography, that is: the plurality of openings are obtained by an exposure and development process. Without limitation, other materials may be used for the pixel defining layer 6, and the manner of forming the plurality of openings may be other manners, and may be selected according to actual needs, which is within the protection scope of the present disclosure.
A third aspect of the present disclosure provides a display panel. The display panel may include the display substrate described above. Thus, the display panel can realize high-gamut display and can reduce display power consumption while realizing high-gamut display.
A fourth aspect of the present disclosure provides a display device. The display device may comprise the display panel described above. Thus, the display device can also realize high-gamut display, and can also reduce display power consumption while realizing high-gamut display.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (10)

1. A display substrate, comprising:
driving the back plate;
the first electrode layer is arranged on one side of the driving back plate and at least comprises a plurality of electrode blocks which are arranged in an array mode, the plurality of electrode blocks comprise first electrode blocks and second electrode blocks, and the thickness of each first electrode block is smaller than that of each second electrode block;
the light-emitting material layer covers the electrode block and is of a continuous whole-layer structure;
a second electrode layer covering the light emitting material layer;
the color film layer is arranged on one side, deviating from the driving backboard, of the second electrode layer and comprises a green first filter area and a red second filter area, the orthographic projection of the first filter area on the driving backboard is at least partially overlapped with the orthographic projection of the first electrode block on the driving backboard, and the orthographic projection of the second filter area on the driving backboard is at least partially overlapped with the orthographic projection of the second electrode block on the driving backboard.
2. The display substrate of claim 1, wherein the color film layer further comprises: a third filter region of blue and a fourth filter region of white;
the electrode block further includes: the thickness of the third electrode block and the thickness of the fourth electrode block are the same as the thickness of the second electrode block;
the orthographic projection of the third filter area on the driving back plate is at least partially overlapped with the orthographic projection of the third electrode block on the driving back plate, and the orthographic projection of the fourth filter area on the driving back plate is at least partially overlapped with the orthographic projection of the fourth electrode block on the driving back plate.
3. The display substrate according to claim 2, wherein the thickness of the first electrode block and the thickness of the second electrode block satisfy a first relationship:
1.1λB–0.8λG-20≥H2-H1≥1.1λB–0.8λG-30；
wherein H1Is the thickness of the first electrode block, H2Is the thickness, lambda, of the second electrode blockBA wavelength of blue light; lambda [ alpha ]GThe wavelength of green light.
4. The display substrate according to claim 2, wherein the first electrode layer and the light emitting material layer satisfy a fourth resonant cavity for blue light.
5. The display substrate according to claim 4, wherein the light emitting material layer comprises a plurality of light emitting layers stacked in a direction away from the driving backplane, each of the light emitting layers comprising a hole transport layer, a light emitting functional layer, and an electron transport layer stacked in a direction away from the driving backplane;
the plurality of light emitting layers include a first light emitting layer, a second light emitting layer, and a third light emitting layer, the second light emitting layer is positioned between the first light emitting layer and the second light emitting layer, and the light emitting functional layer of the second light emitting layer has a yellow sub light emitting functional layer and a red sub light emitting functional layer, and the thickness of the yellow sub light emitting functional layer is greater than that of the red sub light emitting functional layer.
6. The display substrate according to claim 5, wherein the light-emitting functional layer of the first light-emitting layer is a blue light-emitting functional layer, and wherein the thickness of the hole-transporting layer of the first light-emitting layer is larger than the thickness of the hole-transporting layer of the second light-emitting layer.
7. The display substrate according to claim 6, wherein the light-emitting functional layer of the third light-emitting layer is a blue light-emitting functional layer, and wherein the thickness of the hole-transporting layer of the third light-emitting layer is smaller than the thickness of the hole-transporting layer of the second light-emitting layer.
8. A method for manufacturing a display substrate is characterized by comprising the following steps:
forming a driving back plate;
forming at least a plurality of electrode blocks arranged in an array on one side of the driving backboard to form a first electrode layer, wherein the plurality of electrode blocks comprise a first electrode block and a second electrode block, so that the thickness of the first electrode block is smaller than that of the second electrode block;
forming a luminescent material layer, covering the electrode block and enabling the luminescent material layer to be of a continuous whole-layer structure;
forming a second electrode layer and covering the light-emitting material layer;
forming a color film layer on one side of the second electrode layer, which is far away from the driving back plate;
the color film layer comprises a first green filter area and a second red filter area, the orthographic projection of the first filter area on the driving back plate is at least partially overlapped with the orthographic projection of the first electrode block on the driving back plate, and the orthographic projection of the second filter area on the driving back plate is at least partially overlapped with the orthographic projection of the second electrode block on the driving back plate.
9. A display panel comprising the display substrate according to any one of claims 1 to 7.
10. A display device, characterized in that it comprises a display panel as claimed in claim 9.
CN202210345582.1A 2022-03-31 2022-03-31 Display substrate, manufacturing method thereof, display panel and display device Pending CN114725299A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115275048A (en) * 2022-07-20 2022-11-01 武汉华星光电半导体显示技术有限公司 Display panel and mobile terminal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115275048A (en) * 2022-07-20 2022-11-01 武汉华星光电半导体显示技术有限公司 Display panel and mobile terminal
CN115275048B (en) * 2022-07-20 2023-06-06 武汉华星光电半导体显示技术有限公司 Display panel and mobile terminal

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