CN113707822A - Display substrate, display panel and display device - Google Patents
Display substrate, display panel and display device Download PDFInfo
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- CN113707822A CN113707822A CN202110996576.8A CN202110996576A CN113707822A CN 113707822 A CN113707822 A CN 113707822A CN 202110996576 A CN202110996576 A CN 202110996576A CN 113707822 A CN113707822 A CN 113707822A
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- 239000000758 substrate Substances 0.000 title claims abstract description 259
- 230000005525 hole transport Effects 0.000 claims abstract description 124
- 239000000463 material Substances 0.000 claims abstract description 56
- 239000010410 layer Substances 0.000 claims description 440
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 239000012044 organic layer Substances 0.000 claims description 21
- 230000000903 blocking effect Effects 0.000 claims description 19
- 239000003086 colorant Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 description 7
- 238000005538 encapsulation Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000002096 quantum dot Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/352—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels the areas of the RGB subpixels being different
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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Abstract
The application provides a display substrate, a display panel and a display device. The display substrate comprises a substrate and a light-emitting device layer positioned on the substrate. The light emitting device layer includes at least three different colored sub-pixels. The sub-pixel includes an anode layer, a hole transport layer on the anode layer, a light emitting material layer on the hole transport layer, and a cathode layer on the light emitting material layer. The hole transport layers of adjacent sub-pixels are arranged at intervals. The light-emitting device layer further comprises a pixel limiting layer, wherein the pixel limiting layer is provided with pixel openings corresponding to the sub-pixels one by one; the anode layer is positioned between the pixel defining layer and the substrate, the pixel openings expose at least portions of the corresponding anode layer, and the hole transport layer is at least partially positioned within the corresponding pixel openings. The orthographic projection of the hole transport layer of at least one sub-pixel on the substrate falls within the orthographic projection of the bottom of the corresponding pixel opening on the substrate.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a display substrate, a display panel and a display device.
Background
An Organic Light-Emitting Diode (OLED) has the advantages of a wide viewing angle, a fast response, a high contrast ratio, and the like, and has been widely used in display devices.
When the existing OLED display device is used for displaying, adjacent sub-pixels with different colors have a crosstalk problem, for example, when a green sub-pixel is turned on, an adjacent red sub-pixel is also turned on abnormally, which affects the use experience of a user.
Disclosure of Invention
According to a first aspect of embodiments of the present application, there is provided a display substrate. The display substrate comprises a substrate and a light-emitting device layer positioned on the substrate;
the light emitting device layer comprises at least three sub-pixels with different colors; the sub-pixel comprises an anode layer, a hole transport layer positioned on the anode layer, a light emitting material layer positioned on the hole transport layer, and a cathode layer positioned on the light emitting material layer; the hole transport layers of the adjacent sub-pixels are arranged at intervals;
the light-emitting device layer further comprises a pixel limiting layer, and the pixel limiting layer is provided with pixel openings corresponding to the sub-pixels one by one; the anode layer is positioned between the pixel defining layer and the substrate, the pixel openings expose at least portions of the corresponding anode layer, and the hole transport layer is at least partially positioned within the corresponding pixel openings; the orthographic projection of the hole transport layer of at least one of the sub-pixels on the substrate falls within the orthographic projection of the bottom of the corresponding pixel opening on the substrate.
In one embodiment, the edge of the orthographic projection of the hole transport layer of at least one of the sub-pixels on the substrate is located inside the edge of the orthographic projection of the bottom of the corresponding pixel opening on the substrate.
In one embodiment, the at least three different color sub-pixels comprise a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the orthographic projection edge of the hole transport layer of the green sub-pixel on the substrate is positioned inside the orthographic projection edge of the bottom of the corresponding pixel opening on the substrate.
In one embodiment, the orthographic projections of the hole transport layers of the sub-pixels of at least two colors on the substrate are the same in shape and size.
In one embodiment, an orthographic projection of the light emitting material layer of the sub-pixel of at least one color on the substrate coincides with an orthographic projection of the hole transporting material layer thereof on the substrate.
In one embodiment, the sub-pixel further comprises an electron transport layer on the light emitting material layer, the electron transport layers of adjacent sub-pixels being connected; gaps exist between the light-emitting material layers of the adjacent sub-pixels, and part of the electron transport layer fills the gaps between the light-emitting material layers of the adjacent sub-pixels.
In one embodiment, the sub-pixel further comprises a hole blocking layer located between the light emitting material layer and the electron transport layer, and the hole blocking layers of adjacent sub-pixels are connected; part of the hole blocking layer is filled in gaps between the light emitting material layers of the adjacent sub-pixels; and/or the presence of a gas in the gas,
the sub-pixel further comprises an electron injection layer positioned between the electron transmission layer and the cathode layer, and the electron injection layers of the adjacent sub-pixels are connected; and part of the electron injection layer fills gaps between the light emitting material layers of the adjacent sub-pixels.
In one embodiment, the subpixel further comprises at least one organic layer between the anode layer and the cathode layer, the at least one organic layer comprising at least one of a hole injection layer, a hole blocking layer, an electron transport layer, and an electron injection layer; in at least one sub-pixel, the edge of the orthographic projection of at least one of the organic layers on the substrate is located inside the edge of the orthographic projection of the bottom of the corresponding pixel opening on the substrate.
In one embodiment, the sub-pixels further comprise at least one organic layer between the anode layer and the cathode layer, the at least one organic layer comprises at least one of a hole injection layer, a hole blocking layer, an electron transport layer, and an electron injection layer, at least one of the organic layers is a common layer, and each of the sub-pixels shares the common layer.
In one embodiment, the at least three different color sub-pixels comprise a red sub-pixel, a green sub-pixel, and a blue sub-pixel;
the light-emitting device layer is a multi-electron system, the thickness of the hole transport layer corresponding to the red nano light-emitting layer is greater than that of the hole transport layer corresponding to the green nano light-emitting layer, and the thickness of the hole transport layer corresponding to the green nano light-emitting layer is greater than that of the hole transport layer corresponding to the blue nano light-emitting layer;
or,
the light-emitting device layer is a multi-hole system, the thickness of the hole transport layer corresponding to the blue nano light-emitting layer is larger than that of the hole transport layer corresponding to the green nano light-emitting layer, and the thickness of the hole transport layer corresponding to the green nano light-emitting layer is larger than that of the hole transport layer corresponding to the red nano light-emitting layer.
In one embodiment, the at least three different color sub-pixels comprise a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the orthographic projection of the hole transport layer of the green sub-pixel on the substrate falls within the orthographic projection of the bottom of the corresponding pixel opening on the substrate, the edge of the orthographic projection of the hole transport layer of the red sub-pixel on the substrate is positioned outside the edge of the orthographic projection of the top of the corresponding pixel opening on the substrate, and the edge of the orthographic projection of the hole transport layer of the blue sub-pixel on the substrate is positioned outside the edge of the orthographic projection of the top of the corresponding pixel opening on the substrate.
In one embodiment, the electron transport layer of the red sub-pixel faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transport layer of the green sub-pixel faces away from the surface of the substrate to the maximum distance of the substrate; the electron transport layer of the sub-pixel of blue color faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transport layer of the sub-pixel of green color faces away from the surface of the substrate to the maximum distance of the substrate.
In one embodiment, the cathode layer of the red sub-pixel faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transport layer of the green sub-pixel faces away from the surface of the substrate to the maximum distance of the substrate; the cathode layer of the sub-pixel of the blue color faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transmission layer of the sub-pixel of the green color faces away from the surface of the substrate to the maximum distance of the substrate.
According to a second aspect of embodiments of the present application, there is provided a display panel including the display substrate described above.
According to a third aspect of embodiments of the present application, there is provided a display device including the display panel described above.
The embodiment of the application achieves the main technical effects that:
according to the display substrate, the display panel and the display device provided by the embodiment of the application, the hole transport layers of the adjacent sub-pixels are arranged at intervals, so that hole transport between the hole transport layers of the adjacent sub-pixels can be avoided, abnormal lighting of the adjacent sub-pixels with other colors when the sub-pixels are lighted is avoided, the color cast problem of the display substrate can be improved, and the use experience of a user can be improved; because the orthographic projection of the hole transport layer of at least one sub-pixel on the substrate falls into the orthographic projection of the bottom of the corresponding pixel opening on the substrate, the distance between the hole transport layer of the sub-pixel and the hole transport layer of the adjacent sub-pixel is larger, the hole transport between the hole transport layer of the sub-pixel and the hole transport layer of the adjacent sub-pixel is more favorably avoided, and the color cast problem of the display substrate can be more effectively improved; the orthographic projection of the hole transport layer of at least one sub-pixel on the substrate is arranged in the orthographic projection of the bottom of the corresponding pixel opening on the substrate, the light emitting area of the sub-pixel is equal to or smaller than the area where the hole transport layer is located, the light emitting area of the sub-pixel is smaller, the distance between the edge of the light emitting area of the sub-pixel and the edge of the anode layer is larger, light emitted by the sub-pixel passes through the pixel limiting layer and bypasses the anode layer, the probability of finally emitting from the back of the display substrate is greatly reduced, the back light leakage phenomenon of the display panel can be effectively improved, and the use experience of users is facilitated to be improved.
Drawings
FIG. 1 is a partial cross-sectional view of a display substrate provided in an exemplary embodiment of the present application;
FIG. 2 is a partial cross-sectional view of a display substrate provided in accordance with another exemplary embodiment of the present application;
fig. 3 is a partial schematic view of a pixel arrangement of a display substrate according to an exemplary embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
As described in the background art, the conventional display panel has a problem of crosstalk between adjacent sub-pixels of different colors during display, which causes a color shift problem. The inventors have found that the reason for this problem is that: the hole injection layer of the display substrate is a common layer, namely, the hole injection layer is shared by all sub-pixels of the display substrate; the hole injection layer is typically doped with a P-type dopant and has a high hole mobility. When a certain sub-pixel is lightened, the hole can be transmitted to the sub-pixels of other adjacent colors through the hole injection layer, so that the sub-pixels of different adjacent colors are abnormally lightened (slightly lightened), and the problem of color cast of the display panel can be caused, and the use experience of a user is influenced.
The embodiment of the application provides a display substrate, a display panel and a display device, which can solve the technical problems. The display substrate, the display panel, and the display device in the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Features in the embodiments described below may complement or be combined with each other without conflict.
The embodiment of the application provides a display substrate. Referring to fig. 1 and 2, the display substrate 100 includes a substrate 10 and a light emitting device layer 20 on the substrate 10.
The light emitting device layer 20 includes at least three different color sub-pixels 201. The sub-pixel 201 comprises an anode layer 21, a hole transport layer 22 on the anode layer 21, a light emitting material layer 23 on the hole transport layer 22, and a cathode layer 24 on the light emitting material layer 23; the hole transport layers 22 of the adjacent sub-pixels 201 are arranged at intervals.
The light emitting device layer 20 further includes a pixel defining layer 25, and the pixel defining layer 25 is provided with pixel openings 251 corresponding to the sub-pixels 201 one to one. The anode layers 21 are located between the pixel defining layers 25 and the substrate 10, the pixel openings 251 expose at least portions of the corresponding anode layers 21, and the hole transport layers 22 are located at least partially within the corresponding pixel openings 251. The orthographic projection of the hole transport layer 22 of at least one of the sub-pixels 201 on the substrate 10 falls within the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10. Wherein the bottom of the pixel opening 251 refers to a side of the pixel opening 251 in contact with the anode layer 21. The fact that the orthographic projection of the hole transport layer 22 of the sub-pixel 201 on the substrate 10 falls within the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10 means that the edge of the orthographic projection of the hole transport layer 22 of the sub-pixel 201 on the substrate 10 is located inside the edge of the orthographic projection of the corresponding pixel opening 251 on the substrate 10, or the orthographic projection of the hole transport layer 22 of the sub-pixel 201 on the substrate 10 coincides with the orthographic projection of the corresponding pixel opening 251 on the substrate 10.
According to the display substrate provided by the embodiment of the application, the hole transport layers of the adjacent sub-pixels are arranged at intervals, so that the hole transport between the hole transport layers of the adjacent sub-pixels can be avoided, the abnormal lighting of the adjacent sub-pixels with other colors when the sub-pixels are lighted is avoided, the color cast problem of the display substrate can be improved, and the use experience of a user can be improved; because the orthographic projection edge of the hole transport layer of at least one sub-pixel on the substrate is positioned at the inner side of the orthographic projection edge of the bottom of the corresponding pixel opening on the substrate, the distance between the hole transport layer of the sub-pixel and the hole transport layer of the adjacent sub-pixel is larger, the hole transport between the hole transport layer of the sub-pixel and the hole transport layer of the adjacent sub-pixel is avoided, and the color cast problem of the display substrate can be improved more effectively; the orthographic projection of the hole transport layer of at least one sub-pixel on the substrate is arranged in the orthographic projection of the bottom of the corresponding pixel opening on the substrate, the light emitting area of the sub-pixel is equal to or smaller than the area where the hole transport layer is located, the light emitting area of the sub-pixel is smaller, the distance between the edge of the light emitting area of the sub-pixel and the edge of the anode layer is larger, light emitted by the sub-pixel passes through the pixel limiting layer and bypasses the anode layer, the probability of finally emitting from the back of the display substrate is greatly reduced, the back light leakage phenomenon of the display panel can be effectively improved, and the use experience of users is facilitated to be improved.
The light emitting area of the sub-pixel is the area where the overlapping portions of all the film layers in the sub-pixel are located. The back side of the display substrate refers to the side of the display substrate facing away from the display side.
In one embodiment, the substrate 10 may be a flexible substrate or a rigid substrate. The material of the flexible substrate may include one or more of polyimide, polyethylene terephthalate, and polycarbonate. The material of the rigid substrate may be glass.
In one embodiment, the anode layer 21 of the sub-pixel 201 is a block electrode, and the anode layers 21 of adjacent sub-pixels 201 are arranged at intervals; the cathode layer of each sub-pixel 201 may be a planar electrode connected in one piece, that is, the cathode layer of the sub-pixel is a common electrode.
In one embodiment, the light emitting material layer is an organic light emitting material layer, or the light emitting material layer is a quantum dot light emitting material layer.
In the embodiment shown in fig. 1, the edge of the orthographic projection of the bottom of the pixel opening 251 on the substrate 10 falls inside the edge of the orthographic projection of the corresponding anode layer 21 on the substrate 10. In other embodiments, the edge of the orthographic projection of the bottom of the pixel opening 251 on the substrate 10 may fall inside or outside the edge of the orthographic projection of the corresponding anode layer 21 on the substrate 10, or the edge of the orthographic projection of the bottom of the pixel opening 251 on the substrate 10 may coincide with the edge of the orthographic projection of the corresponding anode layer 21 on the substrate 10.
In one embodiment, as shown in fig. 3, the at least three different color sub-pixels 201 include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. Fig. 3 is a schematic diagram of an arrangement of sub-pixels of a display substrate, and in other embodiments, the arrangement of the sub-pixels may be different from that of fig. 3. In fig. 3, solid lines represent edges of an orthographic projection of the bottom of the pixel opening 251 of the sub-pixel on the substrate 10, and broken lines represent edges of an orthographic projection of the hole transport layer 22 of the sub-pixel on the substrate 10.
In one embodiment, as shown in fig. 1, the edge of the orthographic projection of the hole transport layer of at least one of the sub-pixels on the substrate is located inside the edge of the orthographic projection of the bottom of the corresponding pixel opening on the substrate. With the arrangement, a space exists between the light emitting region of the sub-pixel and the pixel limiting layer, the distance between the edge of the light emitting region of the sub-pixel and the edge of the anode layer is larger, the light emitted by the sub-pixel passes through the pixel limiting layer and bypasses the anode layer, the probability of being emitted from the back of the display substrate is further reduced, and the back light leakage phenomenon of the display panel can be effectively improved.
In one embodiment, referring again to fig. 1 and 3, the orthographic edge of the hole transport layer 22 of the green sub-pixel G on the substrate 10 is located inside the orthographic edge of the bottom of the corresponding pixel opening 251 on the substrate 10. That is, the hole transport layer 22 of the green sub-pixel G is not in contact with the pixel defining layer 25. With the arrangement, the probability that the light emitted by the green sub-pixel G passes through the pixel limiting layer and bypasses the anode layer and finally exits from the back of the display substrate is greatly reduced. Because human eyes are sensitive to green, the quantity of green light rays emitted from the back of the display panel is reduced, the quantity of light leakage at the back of the display substrate sensed by the human eyes is reduced, and the use experience of a user is improved. In another embodiment, as shown in fig. 2, the orthographic projection of the hole transport layer 22 of the green sub-pixel G on the substrate 10 may coincide with the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10.
In the embodiment shown in fig. 1 and 3, the edge of the orthographic projection of the hole transport layer 22 of the green sub-pixel G on the substrate 10 is located inside the edge of the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10; the edge of the orthographic projection of the hole transport layer 22 of the red sub-pixel R on the substrate 10 is positioned outside the edge of the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10; the hole transport layer 22 of the sub-pixel B of blue color is located outside the edge of the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10 at the edge of the orthographic projection on the substrate 10. In other embodiments, the edge of the orthographic projection of the hole transport layer 22 of the red sub-pixel R on the substrate 10 may be located inside the edge of the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10; and/or, the edge of the orthographic projection of the hole transport layer 22 of the blue sub-pixel B on the substrate 10 may be located inside the edge of the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10.
In one embodiment, the orthographic projections of the hole transport layers 22 of the sub-pixels 201 of at least two colors on the substrate 10 are the same in shape and size. With such an arrangement, the hole transport layers 22 of the sub-pixels 201 of at least two colors can be prepared by using the same mask, which is beneficial to reducing the number of masks required in the preparation process of the display substrate and reducing the preparation cost of the display substrate. In the embodiment shown in fig. 3, the orthographic projection of the hole transport layer 22 of the red sub-pixel R on the substrate 10 and the orthographic projection of the hole transport layer 22 of the blue sub-pixel B on the substrate 10 are the same in shape and size, and the hole transport layer 22 of the red sub-pixel R and the hole transport layer 22 of the blue sub-pixel B can be prepared by using the same mask. In other embodiments, the orthographic projection of the hole transport layer 22 of the red sub-pixel R on the substrate 10 may be the same as the orthographic projection of the hole transport layer 22 of the green sub-pixel G on the substrate 10 in shape and size; or the orthographic projection of the hole transport layer 22 of the blue sub-pixel B on the substrate 10 is the same as the orthographic projection of the hole transport layer 22 of the green sub-pixel G on the substrate 10 in shape and size; alternatively, the shape and size of the orthographic projection of the hole transport layer of the sub-pixel 201 of each color on the substrate 10 are the same.
In one embodiment, the orthographic projection of the light emitting material layer 23 of the sub-pixel of at least one color on said substrate 10 coincides with the orthographic projection of its hole transport layer 22 on said substrate 10. With such an arrangement, the hole transport layer 22 and the light emitting material layer 23 of the color sub-pixel 201 can be prepared by using the same mask, so that the number of masks required in the preparation process of the display substrate can be reduced, and the preparation cost of the display substrate can be reduced. In the embodiment shown in fig. 1, the orthographic projection of the hole transport layer 22 of the red sub-pixel R on the substrate 10 coincides with the orthographic projection of the light emitting material layer 23 thereof on the substrate 10. The orthographic projection of the hole transport layer 22 of the sub-pixel B of blue color on the substrate 10 can also coincide with the orthographic projection of the light emitting material layer 23 thereof on the substrate 10.
In one embodiment, referring to fig. 1 and 3 again, the sub-pixel 201 further includes an electron transport layer 26 on the luminescent material layer 23, and the electron transport layer 26 of the adjacent sub-pixel 201 is connected. The electron transport layer 26 is a common layer, and is shared by the sub-pixels of the display substrate. There is a gap between the luminescent material layers 23 of adjacent sub-pixels 201, and a portion of the electron transport layer 26 fills the gap between the luminescent material layers of adjacent sub-pixels. By arranging a gap between the luminescent material layers 23 of the adjacent sub-pixels 201, signal crosstalk between the luminescent material layers 23 of the sub-pixels with different colors can be avoided, and the color shift problem of the display substrate is further improved; the electron transport layer 26 is filled between the adjacent light emitting material layers 23, and is in direct contact with the pixel defining layer 25, the refractive index of the electron transport layer 26 is higher, and is generally greater than that of the film layer below the electron transport layer 26, and when light emitted by the sub-pixels passes through the pixel defining layer 25 and upwards and enters the interface between the pixel defining layer 25 and the electron transport layer 26, the amount of light reflected and emitted from the back of the display substrate is less, which is beneficial to improving the problem of light leakage at the back of the display substrate. In the embodiment shown in fig. 1, the gap between the luminescent material layer 23 of the red sub-pixel R and the luminescent material layer 23 of the green sub-pixel G is filled with a portion of the electron transport layer 26. The gap between the light-emitting material layer 23 of the red sub-pixel R and the light-emitting material layer 23 of the blue sub-pixel B of the display substrate is also filled with a portion of the electron transport layer 26, and the gap between the light-emitting material layer 23 of the blue sub-pixel B and the light-emitting material layer 23 of the green sub-pixel G is also filled with a portion of the electron transport layer 26.
In one embodiment, referring again to fig. 2, the sub-pixel 201 further includes a hole blocking layer 27 between the light emitting material layer 23 and the electron transport layer 26, and the hole blocking layer 27 of the adjacent sub-pixel 201 is connected. The hole blocking layer 27 is a common layer, and the hole blocking layer 27 is shared by the sub-pixels of the display substrate. A part of the hole blocking layer 27 fills the gap between the light emitting material layers 23 of the adjacent sub-pixels 201.
In one embodiment, referring again to fig. 2, the sub-pixel 201 further comprises an electron injection layer 28 located between the electron transport layer 26 and the cathode layer 24, the electron injection layer 28 of the adjacent sub-pixel 201 being connected. The electron injection layer 28 is a common layer, and the sub-pixels 201 of the display substrate share the electron injection layer 28.
In some embodiments, when the gap between the organic light emitting material layers of the adjacent sub-pixels is large, a portion of the electron injection layer 28 may fill the gap between the light emitting material layers 23 of the adjacent sub-pixels 201. In another embodiment, as shown in fig. 2, the electron injection layer 28 may not fill the gap between the light emitting material layers 23 of the adjacent sub-pixels 201.
In another embodiment, there may be an overlap of the layers of light emitting material 23 of adjacent sub-pixels. That is, there is an overlapping region between the orthographic projection of the light-emitting material layer 23 of the sub-pixel on the substrate 10 and the orthographic projection of the light-emitting material layer 23 of the adjacent sub-pixel on the substrate 10.
In one embodiment, the sub-pixel 201 further comprises at least one organic layer between the anode layer 21 and the cathode layer 24, the at least one organic layer comprising at least one of a hole injection layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The hole injection layer is located between the anode layer 21 and the hole transport layer 22, and the electron transport layer, the hole blocking layer and the electron injection layer are located between the light emitting material layer 23 and the cathode layer 24. If the sub-pixel 201 includes an electron transport layer, a hole blocking layer and an electron injection layer, the electron injection layer is located between the electron transport layer and the cathode layer, and the hole blocking layer is located between the organic light emitting material layer and the electron transport layer.
In at least one sub-pixel, the edge of the orthographic projection of at least one of the organic layers on the substrate is located inside the edge of the orthographic projection of the bottom of the corresponding pixel opening on the substrate. With such an arrangement, the distance between the organic layer of the sub-pixel and the organic layer of the adjacent sub-pixel is relatively large, so that electron or hole transmission between the organic layers of different sub-pixels can be avoided, and the color cast problem of the display substrate can be further improved.
In one embodiment, at least one of the organic layers is a common layer, and each of the sub-pixels shares the common layer. The common layer refers to that the organic layers of the sub-pixels of the display substrate are connected into a whole to form a whole film layer. For example, the hole injection layer is a common layer, which means that the hole injection layers of all the sub-pixels of the display substrate are connected into one piece to form a film layer on the whole surface. By arranging at least one organic layer as a common layer, the situation that a cathode layer is in direct contact with an anode layer to cause short circuit can be avoided, and the normal work of the sub-pixels is ensured.
In one embodiment, the light emitting device layer is a multiple electron system, the thickness of the hole transport layer of the red sub-pixel is greater than the thickness of the hole transport layer of the green sub-pixel, and the thickness of the hole transport layer of the green sub-pixel is greater than the thickness of the hole transport layer of the blue sub-pixel. Due to the arrangement, the sub-pixels with different colors can achieve the effect of hole and electron transmission balance, and the device performance of the display substrate can be improved.
In another embodiment, the light emitting device layer is a multi-hole system, the thickness of the hole transport layer of the blue sub-pixel is greater than that of the hole transport layer of the green sub-pixel, and the thickness of the hole transport layer of the green sub-pixel is greater than that of the hole transport layer of the red sub-pixel. The arrangement is beneficial to the light-emitting diode to achieve the effect of hole and electron transmission balance, and the device performance of the light-emitting diode is improved.
In yet another embodiment, the hole transport layers of the sub-pixels 201 in the display substrate are all the same thickness. By the arrangement, the hole transport layer of each sub-pixel can be formed in the same process step by adopting the same mask, so that the number of masks in the preparation process of the display substrate can be reduced, the preparation cost of the display substrate is reduced, and the complexity of the preparation process is facilitated to be simplified.
In one embodiment, referring again to fig. 1, the display substrate 100 further includes a pixel driving circuit layer 30, the pixel driving circuit layer 30 being located between the substrate 10 and the light emitting device layer 20. The pixel driving circuit layer 30 includes a plurality of pixel circuits. The pixel circuits may correspond to the sub-pixels one to one, and the pixel circuits are used to drive the corresponding sub-pixels.
In one embodiment, as shown in fig. 1 and 2, the orthographic projection of the hole transport layer 22 of the green sub-pixel G on the substrate 10 falls within the orthographic projection of the bottom of the corresponding pixel opening 251 on the substrate 10, the edge of the orthographic projection of the hole transport layer 22 of the red sub-pixel R on the substrate 10 is located outside the edge of the orthographic projection of the top of the corresponding pixel opening 251 on the substrate 10, and the edge of the orthographic projection of the hole transport layer 22 of the blue sub-pixel B on the substrate 10 is located outside the edge of the orthographic projection of the top of the corresponding pixel opening 251 on the substrate 10. Wherein the edge of the orthographic projection of the hole transport layer on the substrate 10 is located outside the edge of the orthographic projection of the top of the corresponding pixel opening 251 on the substrate 10 means that the hole transport layer 22 is partially located on top of the pixel defining layer 25.
Further, the electron transport layer of the red sub-pixel faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transport layer of the green sub-pixel faces away from the surface of the substrate to the maximum distance of the substrate; the electron transport layer of the sub-pixel of blue color faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transport layer of the sub-pixel of green color faces away from the surface of the substrate to the maximum distance of the substrate.
The hole transport layer part of the red sub-pixel is positioned on the top of the pixel defining layer, and the distance from the surface of the hole transport layer of the red sub-pixel, which faces away from the substrate, to the substrate is the maximum distance from the surface of the hole transport layer of the red sub-pixel, which faces away from the substrate, to the substrate; the blue sub-pixel portion is located on top of the pixel defining layer, the portion of the hole transport layer facing away from the surface of the substrate to the substrate being the maximum distance of the hole transport layer of the blue sub-pixel facing away from the surface of the substrate to the substrate. The green hole transport layer is located in the pixel opening, so that the maximum distance from the surface of the red sub-pixel and the surface of the blue sub-pixel, which are far away from the substrate, to the substrate is larger than the maximum distance from the surface of the green hole transport layer, which is far away from the substrate, to the substrate. And the electron transport layer is positioned on the hole transport layer, and the maximum distance from the surface of the electron transport layer of the red sub-pixel and the surface of the electron transport layer of the blue sub-pixel, which are far away from the substrate, to the substrate is greater than the maximum distance from the electron transport layer of the green sub-pixel to the substrate.
When the electron transport layer is a common layer, the electron transport layer of the green sub-pixel may be a portion of the electron transport layer longitudinally opposite to the light emitting layer of the green sub-pixel, the electron transport layer of the red sub-pixel may be a portion of the electron transport layer longitudinally opposite to the light emitting layer of the red sub-pixel, and the electron transport layer of the blue sub-pixel may be a portion of the electron transport layer longitudinally opposite to the light emitting layer of the blue sub-pixel.
Further, the cathode layer of the red sub-pixel faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transport layer of the green sub-pixel faces away from the surface of the substrate to the maximum distance of the substrate; the cathode layer of the sub-pixel of the blue color faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transmission layer of the sub-pixel of the green color faces away from the surface of the substrate to the maximum distance of the substrate.
Because the maximum distance from the surface of the red sub-pixel, which is deviated from the substrate, to the substrate is greater than the maximum distance from the surface of the green hole transport layer, which is deviated from the substrate, to the substrate, and the cathode layer is located on the hole transport layer, the maximum distance from the surface of the red sub-pixel, which is deviated from the substrate, to the substrate is greater than the maximum distance from the cathode layer of the green sub-pixel, which is deviated from the substrate, to the substrate.
Where the cathode layer is a common layer, the cathode layer of the green sub-pixel may be a portion of the cathode layer longitudinally opposite the light emitting layer of the green sub-pixel, the cathode layer of the red sub-pixel may be a portion of the cathode layer longitudinally opposite the light emitting layer of the red sub-pixel, and the cathode layer of the blue sub-pixel may be a portion of the cathode layer longitudinally opposite the light emitting layer of the blue sub-pixel.
The embodiment of the application also provides a display panel. The display panel comprises the display substrate of any one of the embodiments.
In one embodiment, the display panel further comprises an encapsulation layer on a side of the light emitting device layer facing away from the substrate. In some embodiments, the encapsulation layer may be a thin film encapsulation layer.
In one embodiment, the display panel further comprises a cover plate located on a side of the encapsulation layer facing away from the substrate. When the display panel is a non-flexible display panel, the cover plate may be a glass cover plate.
The embodiment of the application also provides a display device which comprises the display panel in the embodiment.
The display device may further include a housing in which the display panel is embedded.
The display device provided by the embodiment of the application can be any equipment with a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a vehicle-mounted equipment and the like.
It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element may also be present. Like reference numerals refer to like elements throughout.
Other embodiments of the present application 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 invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (15)
1. The display substrate is characterized by comprising a substrate and a light-emitting device layer positioned on the substrate;
the light emitting device layer comprises at least three sub-pixels with different colors; the sub-pixel comprises an anode layer, a hole transport layer positioned on the anode layer, a light emitting material layer positioned on the hole transport layer, and a cathode layer positioned on the light emitting material layer; the hole transport layers of the adjacent sub-pixels are arranged at intervals;
the light-emitting device layer further comprises a pixel limiting layer, and the pixel limiting layer is provided with pixel openings corresponding to the sub-pixels one by one; the anode layer is positioned between the pixel defining layer and the substrate, the pixel openings expose at least portions of the corresponding anode layer, and the hole transport layer is at least partially positioned within the corresponding pixel openings; the orthographic projection of the hole transport layer of at least one of the sub-pixels on the substrate falls within the orthographic projection of the bottom of the corresponding pixel opening on the substrate.
2. The display substrate of claim 1, wherein an edge of an orthographic projection of the hole transport layer of at least one of the sub-pixels on the substrate is located inward of an edge of an orthographic projection of a bottom of the corresponding pixel opening on the substrate.
3. The display substrate of claim 2, wherein the at least three different color sub-pixels comprise a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the orthographic projection edge of the hole transport layer of the green sub-pixel on the substrate is positioned inside the orthographic projection edge of the bottom of the corresponding pixel opening on the substrate.
4. The display substrate of claim 1, wherein the orthographic projections of the hole transport layers of the sub-pixels of at least two colors on the substrate are the same in shape and size.
5. A display substrate as claimed in claim 1, wherein the orthographic projection of the light-emitting material layer of the sub-pixel of at least one color on the substrate coincides with the orthographic projection of the hole-transporting material layer thereof on the substrate.
6. The display substrate of claim 1, wherein the sub-pixels further comprise an electron transport layer on the layer of light emitting material, the electron transport layers of adjacent sub-pixels being connected; gaps exist between the light-emitting material layers of the adjacent sub-pixels, and part of the electron transport layer fills the gaps between the light-emitting material layers of the adjacent sub-pixels.
7. The display substrate of claim 6, wherein the sub-pixel further comprises a hole blocking layer between the light emitting material layer and the electron transport layer, the hole blocking layers of adjacent sub-pixels being connected; part of the hole blocking layer is filled in gaps between the light emitting material layers of the adjacent sub-pixels; and/or the presence of a gas in the gas,
the sub-pixel further comprises an electron injection layer positioned between the electron transmission layer and the cathode layer, and the electron injection layers of the adjacent sub-pixels are connected; and part of the electron injection layer fills gaps between the light emitting material layers of the adjacent sub-pixels.
8. The display substrate of claim 1, wherein the sub-pixel further comprises at least one organic layer between the anode layer and the cathode layer, the at least one organic layer comprising at least one of a hole injection layer, a hole blocking layer, an electron transport layer, and an electron injection layer; in at least one sub-pixel, the edge of the orthographic projection of at least one of the organic layers on the substrate is located inside the edge of the orthographic projection of the bottom of the corresponding pixel opening on the substrate.
9. The display substrate of claim 1, wherein the sub-pixels further comprise at least one organic layer between the anode layer and the cathode layer, the at least one organic layer comprising at least one of a hole injection layer, a hole blocking layer, an electron transport layer, and an electron injection layer, at least one of the organic layers being a common layer, each of the sub-pixels sharing the common layer.
10. The display substrate of claim 1, wherein the at least three different color sub-pixels comprise a red sub-pixel, a green sub-pixel, and a blue sub-pixel;
the light-emitting device layer is a multi-electron system, the thickness of the hole transport layer corresponding to the red nano light-emitting layer is greater than that of the hole transport layer corresponding to the green nano light-emitting layer, and the thickness of the hole transport layer corresponding to the green nano light-emitting layer is greater than that of the hole transport layer corresponding to the blue nano light-emitting layer;
or,
the light-emitting device layer is a multi-hole system, the thickness of the hole transport layer corresponding to the blue nano light-emitting layer is larger than that of the hole transport layer corresponding to the green nano light-emitting layer, and the thickness of the hole transport layer corresponding to the green nano light-emitting layer is larger than that of the hole transport layer corresponding to the red nano light-emitting layer.
11. The display substrate of claim 1, wherein the at least three different color sub-pixels comprise a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the orthographic projection of the hole transport layer of the green sub-pixel on the substrate falls within the orthographic projection of the bottom of the corresponding pixel opening on the substrate, the edge of the orthographic projection of the hole transport layer of the red sub-pixel on the substrate is positioned outside the edge of the orthographic projection of the top of the corresponding pixel opening on the substrate, and the edge of the orthographic projection of the hole transport layer of the blue sub-pixel on the substrate is positioned outside the edge of the orthographic projection of the top of the corresponding pixel opening on the substrate.
12. The display substrate of claim 11, wherein the electron transport layer of the red sub-pixel is at a maximum distance from the surface of the substrate away from the substrate that is greater than the maximum distance from the surface of the green sub-pixel away from the substrate to the substrate; the electron transport layer of the sub-pixel of blue color faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transport layer of the sub-pixel of green color faces away from the surface of the substrate to the maximum distance of the substrate.
13. The display substrate of claim 11, wherein the cathode layer of the red sub-pixel is at a maximum distance from the surface of the substrate away from the substrate, and wherein the electron transport layer of the green sub-pixel is at a maximum distance from the surface of the substrate away from the substrate greater than the maximum distance from the surface of the green sub-pixel to the substrate; the cathode layer of the sub-pixel of the blue color faces away from the surface of the substrate to the maximum distance of the substrate, and the electron transmission layer of the sub-pixel of the green color faces away from the surface of the substrate to the maximum distance of the substrate.
14. A display panel comprising the display substrate according to any one of claims 1 to 13.
15. A display device characterized by comprising the display panel according to claim 14.
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