CN114823826A - Display substrate and display panel - Google Patents

Display substrate and display panel Download PDF

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Publication number
CN114823826A
CN114823826A CN202210379906.3A CN202210379906A CN114823826A CN 114823826 A CN114823826 A CN 114823826A CN 202210379906 A CN202210379906 A CN 202210379906A CN 114823826 A CN114823826 A CN 114823826A
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China
Prior art keywords
layer
expansion
light emitting
display substrate
emitting device
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CN202210379906.3A
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Chinese (zh)
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李巍
夏景成
萧智鸿
黄智�
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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Priority to CN202210379906.3A priority Critical patent/CN114823826A/en
Publication of CN114823826A publication Critical patent/CN114823826A/en
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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
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
    • 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

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  • Microelectronics & Electronic Packaging (AREA)
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Abstract

The present application provides a display substrate and a display panel, the display substrate including a base, a pixel defining layer, a plurality of light emitting devices, and an expansion layer. The pixel defining layer is located on the substrate and comprises a plurality of openings. A plurality of light emitting devices are defined in the opening, and a portion of the plurality of light emitting devices are color cast light emitting devices. The expansion layer is positioned on a side of the pixel defining layer facing away from the substrate, and at least a portion of the expansion layer surrounds an opening defining the color cast light emitting device. At high temperature, the expansion layer expands to shield the light emitted by the color cast light-emitting device, so that the light-emitting brightness of the sub-pixels corresponding to the color cast light-emitting device is reduced, and the high-temperature color cast problem of the display substrate and the display panel is relieved or eliminated.

Description

Display substrate and display panel
Technical Field
The application relates to the technical field of display, in particular to a display substrate and a display panel with the same.
Background
Organic Light-Emitting diodes (OLEDs) have many advantages such as simple fabrication process, low cost, low power consumption, high brightness, wide viewing angle, high contrast, and flexible display, and are widely used in various electronic display products.
However, for an electronic display product adopting the organic light emitting diode technology, the temperature dependency is high, and the brightness of the electronic display product changes with the temperature change under the same driving voltage, so that when the ambient temperature changes, the OLED display generates color cast, thereby distorting the display image of the electronic display product and reducing the use experience of users.
Disclosure of Invention
In a first aspect of the present application, a display substrate is provided that includes a base, a pixel defining layer, an expansion layer, and a plurality of light emitting devices. The pixel defining layer is located on the substrate and comprises a plurality of openings. The light emitting devices are defined in the openings, and a portion of the plurality of light emitting devices are color-shifting light emitting devices. The expansion layer is located on a side of the pixel defining layer facing away from the substrate. At least a portion of the expansion layer surrounds an opening defining a color-shifting light-emitting device.
When the ambient temperature of the display substrate rises, the expansion layer can shield part of light emitted by the color cast light emitting device, so that the brightness of the sub-pixels corresponding to the color cast light emitting device is reduced, and the color cast phenomenon of the display substrate is improved.
With reference to the first aspect, in some embodiments, an orthographic projection of a portion of the expansion layer surrounding the opening on the surface of the substrate is shaped as a straight line segment; in other embodiments, the orthographic projection of the portion of the expansion layer surrounding the opening on the face of the substrate is in the shape of a non-closed loop; in other embodiments, the orthographic projection of the portion of the intumescent layer surrounding the opening onto the face of the substrate is in the shape of a closed loop.
In the above solutions, there are various solutions for realizing that the expansion layer at least partially surrounds the opening defined with the color cast light emitting device, and the various solutions have advantages that while the color cast phenomenon of the display substrate is improved by reducing the brightness of the sub-pixel corresponding to the color cast light reflecting device, the arrangement scheme of the expansion layer relative to the color cast light emitting device can be designed according to the specific color cast condition of the display substrate, and the applicability of the method is improved.
In combination with the first aspect, in some embodiments, the expansion layer is provided only at a periphery of the opening where the color-shifting light emitting device is defined.
In the above scheme, according to the specific color cast condition of the display substrate, the brightness of the sub-pixel corresponding to the color cast light-emitting device is reduced to make the brightness of the sub-pixel corresponding to the color cast light-emitting device the same as or similar to the brightness of the sub-pixel corresponding to the other light-emitting device, so as to finally achieve the purpose of improving the color cast condition of the display substrate.
In further embodiments, in combination with the first aspect, an expansion layer is disposed at a periphery of each of the openings, and an expansion coefficient of a portion of the expansion layer surrounding the color-shifting light emitting device is larger than that of other portions surrounding the other light emitting devices.
In the above scheme, according to the specific situation that the light emission amount of each light emitting device changes with the temperature, the luminance of the sub-pixels corresponding to each light emitting device is respectively changed by using the different degrees of expansion corresponding to the different expansion layers on each light emitting device, so that the luminance of the sub-pixels corresponding to different light emitting devices is the same or similar, and the color cast problem of the display substrate is effectively improved.
In combination with the first aspect, in some embodiments, the expansion layer is formed by doping a thermal expansion material in the host film layer, and the larger the doping concentration, the larger the expansion volume of the expansion layer. Further, the main film layer and the pixel defining layer are integrally formed.
In the above scheme, the expansion coefficient of the expansion layer is adjusted by adjusting parameters of the expansion layer, such as the doping concentration of the expansion material or the type of the expansion material, so that the adjustment of the light-emitting brightness of the sub-pixel corresponding to the light-emitting device can be realized, and the color cast condition of the display substrate can be accurately improved. In addition, under the condition that main part rete and pixel define the layer integrated into one piece, there is not physical interface between inflation layer and the pixel define the layer, avoids appearing the problem of interface separation between inflation layer and the pixel define the layer, has improved the stability of whole display substrates 'membrane group structure, and then has improved display substrates's life.
In combination with the first aspect, in some embodiments, the end face of the expansion layer facing away from the color-shifting pixel defining layer has a guide structure configured to increase the surface area of the end face of the expansion layer facing away from the substrate.
In the scheme, the surface of the expansion layer deviating from the pixel defining layer in the expansion process is easier to expand by arranging the guide structure, the expansion speed of the expansion layer is increased, the brightness of the sub-pixel corresponding to the light-emitting device is further effectively changed, and the high-temperature color cast condition of the display substrate is effectively improved.
In combination with the first aspect, in some embodiments, the guide structure is a plurality of protrusions, for example, further, the protrusions are linear protrusions, and the extension direction of the linear protrusions is substantially parallel to the side of the corresponding opening.
In further embodiments in combination with the first aspect, the guide structure is a plurality of grooves. For example, further, the grooves are linear grooves, and a plurality of linear grooves cross each other to constitute a cross shape and/or a well shape.
In combination with the first aspect, in some embodiments, the intumescent layer is translucent. For example, further, the intumescent layer has a transparency of 30% to 50%.
In the above scheme, by setting the expansion layer to be in a semi-transparent state, the aperture ratio of the sub-pixel corresponding to the light-emitting device at the position can be adjusted without changing the aperture ratio of the sub-pixel, so that the display effect of the display image of the display substrate is improved.
In further embodiments in combination with the first aspect, the intumescent layer is a light blocking material.
In the above scheme, the expansion layer is set as the light-shielding material, so that the aperture ratio of the sub-pixel corresponding to the light-emitting device at the position can be adjusted to improve the color cast phenomenon of the display substrate.
With reference to the first aspect, in some embodiments, the display substrate further includes a cathode electrode made of a ductile electrode material, and the cathode electrode covers the pixel defining layer and the opening. For example, further, the ductile electrode material includes any one of silver, a metal nanowire, a carbon nanotube, and graphene.
In the scheme, through the limitation of the cathode preparation material, the risk of fracture of the cathode due to expansion of the expansion layer is reduced, and the service life of the display substrate is prolonged.
In some embodiments, in combination with the first aspect, an edge of an orthographic projection of the cathode on the face of the substrate is curvilinear. For example, further, the curved shape is a zigzag or wave shape.
In the scheme, the shape of the cathode is designed, so that the cathode has outward stress release when the expansion layer contracts, and the cathode is not easy to damage, thereby prolonging the service life of the cathode; in addition, the scheme can enable the cathode not to be limited to be designed as a ductile electrode, so that the selection range of the material type of the cathode is increased, and the cost is reduced.
In a second aspect of the embodiments of the present application, a display panel is provided. The display panel comprises any one of the display substrates provided by the first aspect.
Drawings
Fig. 1 is a schematic structural diagram of a display substrate according to an embodiment of the present application.
Fig. 2 is a schematic partial cross-sectional view of the display substrate shown in fig. 1.
Fig. 3 is a graph of the change in the state of the expansion layer with respect to the relative pixel definition layer as the temperature increases.
Fig. 4 is a schematic illustration of the orthographic projection of the cathode on the face of the substrate.
Fig. 5 is a schematic structural diagram of a partial region of a display substrate according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a partial region of another display substrate according to an embodiment of the present application.
FIG. 7 is a schematic diagram of a structure of a partial region of another display substrate according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of a partial region of another display substrate according to an embodiment of the present application.
Fig. 9 is a schematic partial cross-sectional view of the display substrate shown in fig. 8.
Fig. 10 is a schematic structural diagram of a display substrate according to an embodiment of the present application.
Fig. 11 is a schematic partial cross-sectional view of the display substrate shown in fig. 10.
Fig. 12 is a schematic structural diagram of a display substrate according to an embodiment of the present application.
Fig. 13 is a schematic partial cross-sectional view of the display substrate shown in fig. 12.
Fig. 14 is a schematic structural diagram of a display substrate according to an embodiment of the present application.
Fig. 15 is a schematic partial cross-sectional view of the display substrate shown in fig. 14.
Figure 16 is a top view of an intumescent layer having a guide structure.
FIG. 17 is a cross-sectional view taken along line M1-N1 of the pattern shown in FIG. 16.
Figure 18 is a top view of an intumescent layer having a guide structure.
FIG. 19 is a cross-sectional view of the pattern shown in FIG. 18 taken along line M2-N2.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The display area of the display substrate is distributed with a plurality of pixels (which can be called large pixels), the pixels can emit light rays with different colors and different brightness, each pixel comprises a plurality of sub-pixels (which can be called sub-pixels), each sub-pixel can emit light rays with specific colors, the light emitting brightness of each sub-pixel can be adjusted, the light emitting brightness of different sub-pixels is adjusted to combine different light emitting colors and light emitting brightness of the pixels, and the main structure of the sub-pixels capable of emitting light is an OLED device. The OLED device is high in dependency on temperature, and along with changes of ambient temperature, the mobility of different organic materials in the OLED device with different light emitting colors is different, so that under the same driving voltage, along with temperature changes, the brightness of different OLED devices can be changed differently, the light emitting brightness of the sub-pixels is different from the preset light emitting brightness, deviation occurs in the light emitting brightness and the light emitting color of the sub-pixels, and the color cast phenomenon occurs in display of the display substrate. Further, under long-term high-temperature operation, the display substrate may generate irreversible color cast due to the sensitivity difference of the OLED devices with different light-emitting colors in the display substrate to temperature.
The luminance of light emitted from different types (e.g., different colors) of OLED devices in a display substrate may be affected by high temperature, but the color shift of the display substrate tends to be caused by the color of light emitted from one type of OLED device or the combination of the colors of light emitted from several types (not all types) of OLED devices, i.e., the color shift of the display substrate may be considered to be mainly caused by one or several types of OLED devices, and the OLED device that mainly causes the color shift of the display substrate may be referred to as a color-shifted light-emitting device. As such, the color cast light emitting device refers to a light emitting device most sensitive to temperature among the display substrates. Specifically, under the same driving voltage, with the change of temperature, the mobility of the organic material in the color shift light-emitting device is changed greatly compared with other light-emitting devices, so that the brightness of the color shift light-emitting device is increased with the increase of temperature, while the brightness of other light-emitting devices is not changed or has a small relative change trend with respect to the change of the color shift light-emitting device, so that the light emitted by the color shift light-emitting device is brighter than the light emitted by other light-emitting devices, and the color shift phenomenon of the display substrate occurs.
Taking a display substrate including an OLED device emitting light of three colors of R (red), G (green), and B (blue) as an example, the attenuation width of the light emitting efficiency of the red light emitting device is smaller than that of the green light emitting device, and the attenuation width of the light emitting efficiency of the green light emitting device is smaller than that of the blue light emitting device. Therefore, under a high-temperature environment, the color cast condition of some display substrates is towards the red direction, so that the red light-emitting device is a color cast light-emitting device; if the display substrate is used for displaying a picture, the picture may be yellow, and then the red light-emitting device and the green light-emitting device are color-cast light-emitting devices.
The embodiment of the application provides a display substrate, which can improve the phenomenon of high-temperature color cast of the display substrate. The display substrate includes a base, a pixel defining layer, a plurality of light emitting devices, and an expansion layer. The pixel defining layer is located on the substrate and comprises a plurality of openings. A plurality of light emitting devices are defined in the opening, and a portion of the plurality of light emitting devices are color cast light emitting devices. The expansion layer is positioned on a side of the pixel defining layer facing away from the substrate, and at least a portion of the expansion layer surrounds an opening defining the color cast light emitting device. In the display substrate, with the rise of the ambient temperature, the expansion layer arranged on the side of the pixel defining layer, which is away from the substrate, can expand, and gradually extend towards the opening defined with the color cast light emitting device along with the increase of the volume of the expansion layer, so that part of light emitted by the color cast light emitting device is shielded, namely, the brightness of the sub-pixel corresponding to the color cast light emitting device is reduced, and the color cast phenomenon of the display substrate is improved.
The embodiments of the present application will be described below by way of example with reference to the accompanying drawings. It should be appreciated that the implementations of the present application are numerous and should not be construed as limited to the embodiments set forth herein, which are presented merely to provide a more thorough and complete understanding of the present application.
In at least one embodiment of the present application, as shown in fig. 1, 2, and 3, the display substrate includes a base 11, and a pixel defining layer 12, a plurality of light emitting devices 13a (red light emitting devices), 13b (green light emitting devices), 13c (blue light emitting devices), and an expansion layer 14a on the base 11. The pixel defining layer 12 includes a plurality of openings (which may also be understood as grooves). The light emitting devices 13a, 13b, 13c are defined in the opening, and the red light emitting device 13a is assumed to be a color cast light emitting device. The expansion layer 14a is located on a side of the pixel defining layer 12 facing away from the substrate 11, and at least a portion of the expansion layer 14a surrounds an opening defining the red light emitting device 13 a. As the temperature increases, the expansion layer 14a expands to shield part of the light emitted from the red light emitting device 13a, thereby improving the color cast phenomenon of the display substrate. Specifically, as shown in fig. 3, when the expansion layer 14a is not expanded, the width of the expansion layer 14a is substantially equal to the width of the portion of the pixel defining layer 12 between the adjacent light emitting devices, so that the light emitted from the red light emitting device 14a is not blocked, and at a high temperature, the expansion layer 14a expands to become an expansion layer 14d, and the width of the expansion layer 14d is greater than the width of the portion of the pixel defining layer 12 between the adjacent light emitting devices, that is, the expansion layer 14d extends to the periphery to block at least a portion of the opening, so that a portion of the light emitted from the red light emitting device 13a is blocked, and the color cast phenomenon of the display substrate is improved.
In an embodiment of the present application, the substrate may be an array substrate including a substrate and a driving circuit layer, the driving circuit layer may include a pixel driving circuit, and the pixel driving circuit may include a plurality of transistors, capacitors, and the like, for example, in various forms such as 2T1C (i.e., 2 transistors (T) and 1 capacitor (C)), 3T1C, or 7T1C, in the sub-pixel corresponding to each light emitting device. The pixel driving circuit is connected with the light emitting device to control the on-off state and the light emitting brightness of the light emitting device.
In an embodiment of the present application, a light emitting device may include an anode, a cathode, and a light emitting functional layer between the anode and the cathode, the light emitting functional layer including a light emitting layer, the light emitting layer being located in an opening of a pixel defining layer. Generally, to ensure the alignment of the anode and the opening of the pixel defining layer, the anode is located between the pixel defining layer and the substrate, and the size (e.g., area) of the anode is larger than the size (e.g., area) of the corresponding opening. The cathode of each light emitting device is typically common, and thus the cathode is located on the side of the pixel defining layer facing away from the substrate and covers the pixel defining layer and the opening.
It should be understood that in the embodiments of the present application, the light emitting devices are not limited to three in the above examples, and the colors of the light emitting devices are not limited to red, green and blue, and other colors of light, such as white light, purple light, yellow light, etc., may be used, and the technical solution of providing the expansion layer on at least the pixel defining layer provided around the opening defining the color-shifting light emitting device in the above embodiments may be adopted to improve the color-shifting phenomenon of the display substrate according to the specific color-shifting situation of the display substrate in practical application.
Next, in the embodiments of the present application, specific structures of the display substrate and the display panel in the present application will be described by taking, as an example, R, G, B types of light-emitting devices and a red light-emitting device (R) as a color-shift light-emitting device.
In the embodiment of the present disclosure, the cathode of the light emitting device actually covers the expansion layer, and during the expansion of the expansion layer, the cathode may be deformed to break the cathode, thereby causing the display substrate to display a poor display. In this way, the structure of the cathode can be designed to reduce the risk of the cathode being broken.
For example, in some embodiments of the present application, the cathode of the light emitting device may be made of a ductile electrode material. For example, further, the cathode is prepared using an electrode material of any one of malleability of silver, metal nanowire, carbon nanotube, and graphene. When the expansion layer expands along with the increase of the temperature, the cathode with the extensibility also expands along with the expansion of the expansion layer, so that the risk of fracture of the cathode along with the expansion of the expansion layer is reduced, and the service life of the display substrate is prolonged. In these embodiments, all light emitting devices share a single cathode, i.e., the cathode may be a continuous, one-piece structure. Illustratively, as shown in fig. 2, a display substrate for displaying the three primary colors of red, green and blue is taken as an example, and the cathode 15 on the display substrate covers the pixel defining layer 12, the expansion layer 14a and the opening defined by the pixel defining layer 12. At high temperatures, the cathode 15 located above the expansion layer 14a is subject to ductile deformation to avoid breakage as the expansion layer 14a expands, thereby improving the service life of the cathode 15. It should be understood that in order to improve the lifetime of the cathode, the thickness of the cathode can be increased or the strength of the cathode can be enhanced by optimizing the material for preparing the cathode, for example, by doping, and adding a high elastic material without affecting the performance of the cathode.
In other embodiments of the present application, the orthographic edges of the cathode on the face of the substrate are curvilinear. Specifically, the cathode of each light emitting device is an independent electrode, and is electrically connected to each other to form a common electrode. The edge of the orthographic projection of the cathode is designed into a curve, so that the cathode has outward stress release when the expansion layer shrinks due to the reduction of the ambient temperature, the cathode is not easy to damage, and the service life of the cathode is prolonged. Illustratively, as shown in fig. 4, in the display substrate, the edge of the orthographic projection on the plane of the base of the cathode 15 around the opening (the region defined by the dashed line frame) in which the red light emitting device 13a is defined is in a curved shape. Cathodes of the adjacent light emitting devices may be connected to each other by a wire to constitute a common electrode. Furthermore, the wire for connecting the cathode may be provided in a curved shape to reduce the risk of the wire being stretch broken during expansion of the expansion layer.
It is noted that in the embodiment of the present application, in the case where the edge of the cathode is curved, the curved shape may be a zigzag shape or a wave shape as shown in fig. 4. In the above design scheme, the curve is not limited to one shape, so that the production and processing of the cathode are facilitated, the shape of the curve can be selected according to different conditions, and the adaptability of the cathode is improved. It should be understood that the curves of the forward projected edge curves of each individual cathode may be the same or different, e.g., have different curves, different numbers of peaks, etc., and may be designed according to the structure and requirements of the light emitting device in actual application.
In the embodiment of the present application, on the premise that the expansion layer is disposed on the periphery of the color cast light emitting device, the shape and the specific distribution form of the expansion layer may be selected according to the requirements of the actual process, which is not limited herein. Several arrangements of the intumescent layer are described below in relation to several specific examples.
In some embodiments, the shape of the orthographic projection of the portion of the intumescent layer surrounding the opening on the face of the substrate is a straight segment. Exemplarily, as shown in fig. 1 and 2, assuming that the red light emitting device 13a is a color-shift light emitting device, the expansion layer 14a is provided only on a side of the pixel defining layer 12 facing away from the substrate 11 corresponding to any one side of the opening where the red light emitting device 13a is defined. In the above scheme, the area of the expansion layer 14a disposed in the display substrate is reduced as much as possible, so that the brightness of the sub-pixels corresponding to the red light emitting device 13a is reduced, the color cast of the display substrate is improved, and meanwhile, the risk of overall fracture of the cathode due to increase of the step difference around the opening caused by the arrangement of the expansion layer 14a is reduced, that is, the risk of fracture of the cathode does not exist in the area around the opening where the expansion layer 14a is not disposed, so that the service life of the display substrate is prolonged.
It will be understood that the orthographic projection of the portion of the expansion layer surrounding the opening on the base is not limited to the linear segment shape shown in fig. 1, but may be designed according to the specific color cast condition of the display substrate and the arrangement of the cathode. Exemplarily, as shown in fig. 2 and 5, assuming that the red light emitting device 13a is a color-cast light emitting device, an expansion layer 14a is provided on a side of the pixel defining layer 12 facing away from the substrate 11 corresponding to two unconnected sides defining an opening of the red light emitting device 13 a. Further, the expansion layers 14a are symmetrically disposed with respect to the corresponding openings. In the above-described configuration, by designing the distribution of the expansion layers 14a, the number of the expansion layers 14a to be provided is increased, and the problem of color cast of the display substrate or the display panel is effectively improved. Further, by increasing the number of the expansion layers 14a, the requirement for the degree of expansion of each expansion layer 14a can be reduced, thereby allowing the thickness or width of each expansion layer 14a to be reduced, thereby reducing the influence on the service life of the cathode 15 in the display substrate due to the provision of the expansion layers 14a, and improving the service life of the display substrate.
In other embodiments, the orthographic projection of the portion of the intumescent layer surrounding the opening onto the face of the substrate is in the shape of a non-closed loop. Exemplarily, as shown in fig. 2 and 6, assuming that the red light emitting device 13a is a color-cast light emitting device, an expansion layer 14a is provided on a side of the pixel defining layer 12 facing away from the substrate 11 corresponding to the two connected sides defining the opening of the red light emitting device 13a, so that the shape of the orthographic projection of the expansion layer 14a is a non-closed ring shape. In the above configuration, by increasing the number of the expansion layers defining the periphery of the opening of the red light emitting device 13a, the efficiency of reducing the amount of light emitted from the red light emitting device 13a is improved, and the problem of color shift of the display substrate can be effectively improved. Further, by increasing the number of the expansion layers 14a, the requirement for the expansion degree of each expansion layer 14a can be reduced, so that the thickness or width of each expansion layer 13a can be reduced, the risk of overall fracture of the cathode due to increase of the section difference around the opening caused by the arrangement of the expansion layers 14a is reduced, that is, the cathode does not have the risk of fracture in the area without the expansion layers 14a around the opening, and the service life of the display substrate is prolonged. Further, as shown in fig. 6, two adjacent expansion layers 14a are not connected to each other, so that they do not affect each other during the expansion process, and further, stress interference is not generated, thereby improving the service life of the expansion layers 14a, and the expansion efficiency of the expansion layers 14a is increased by providing a reserved expandable space between the two expansion layers 14 a.
It will be appreciated that the orthographic projection of the portion of the expansion layer surrounding the opening onto the base is not limited to a closed loop as shown in fig. 6, but may be designed according to the specific color cast of the display substrate and the arrangement of the cathode. As exemplarily shown in fig. 2 and 7, assuming that the red light emitting device 13a is a color-cast light emitting device, an expansion layer 14a is provided on a side of the pixel defining layer 12 facing away from the substrate 11 corresponding to three sides connected to each other defining an opening of the red light emitting device 13a, and a shape of an orthographic projection of the expansion layer 14a is a non-closed loop, that is, a U-shape. In the above technical solution, the expansion layer 14a is arranged in a large area near the opening defining the red light emitting device 13a, so that the brightness of the sub-pixel corresponding to the red light emitting device 13a can be efficiently reduced, meanwhile, the expansion layers on different sides are integrated, and a gap, i.e., an opening of a U-shaped structure, is also left.
In other embodiments, an orthographic projection of the portion of the intumescent layer surrounding the opening on the face of the substrate is shaped as a closed loop. Exemplarily, as shown in fig. 8 and 9, assuming that the red light emitting device 13a is a color shift light emitting device, an expansion layer 14a is disposed on a side of the pixel defining layer 12 facing away from the substrate 11 on all sides where the opening of the red light emitting device 13a is defined, and the shape of the orthographic projection of the expansion layer 14a is a closed ring, which can rapidly and efficiently reduce the light emission amount of the red light emitting device 14a to alleviate the color shift of the display substrate, and in this scheme, the expansion layer 14a can be made thin or the expansion layer 14a can be made into an integral structure, thereby improving the service life of the display substrate.
It can be understood that there are various technical solutions for realizing that the expansion layer at least partially surrounds and limits the opening of the light emitting device with polarized light, and a suitable design scheme of the expansion layer can be selected according to factors such as the specific color cast condition of the display substrate, the structure of the light emitting device, the process conditions and the like, so as to improve the adaptability of the scheme of the application. For example, in some aspects, the distribution scheme of the expansion layer defining the periphery of the openings of the green and blue light emitting devices may be designed with reference to the distribution scheme of the expansion layer defining the periphery of the opening of the red light emitting device; alternatively, in other schemes, the light emission amount of the color cast light emitting device can be reduced by only arranging the expansion layer at the periphery of the opening where the color cast light emitting device is limited according to the color cast condition of the display substrate, so that the light emission amount of the color cast light emitting device is consistent with or close to the light emission amount of other light emitting devices, and the color cast problem of the display substrate can be improved. Specifically, the design of the expansion layers, such as whether to connect adjacent expansion layers, how to connect adjacent expansion layers, and the like, can be designed according to the specific color cast condition of the display substrate and the structural design of the display substrate. In the following, in different embodiments, the solutions of the two cases are explained.
In some embodiments, an expansion layer is disposed around the periphery of each opening defining a light emitting device, and the expansion coefficient of a portion of the expansion layer surrounding the color cast light emitting device is greater than the expansion coefficient of other portions of the expansion layer surrounding other light emitting devices. That is, expansion layers having different expansion coefficients are respectively provided according to the particulars of the light emission amount of each light emitting device varying with temperature. In the scheme, the expansion layers with different expansion coefficients are used for respectively adjusting the brightness of the sub-pixels corresponding to each light-emitting device, so that the brightness of the sub-pixels corresponding to different light-emitting devices is the same or similar, the problem that the light-emitting quantity of each light-emitting device changes along with the temperature is solved, the light-emitting quantity of each light-emitting device synchronously changes or changes similarly along with the rise of the temperature under the condition of the same voltage, and the color cast phenomenon of the display substrate is improved. Specifically, a display substrate including an OLED device emitting light of three colors of R (red), G (green), and B (blue) is taken as an example.
Illustratively, as shown in fig. 10 and 11, in the display substrate, the peripheries of the openings defining the red light emitting devices 13a included in the display substrate are all provided with the expansion layer 14a, the peripheries of the openings defining the green light emitting devices 13b are all provided with the expansion layer 14b, and the peripheries of the openings defining the blue light emitting devices 13c are not provided with the expansion layer, based on the temperature change attenuation performance of red light, blue light, and green light. This design takes into account that the lifetime of blue light is the shortest in high temperature environments. Therefore, by reducing the luminance of the corresponding sub-pixels of the red light emitting device 13a and the green light emitting device 13b, the luminance of the red light and the green light becomes smaller and finally the same as or similar to the luminance of the blue light, thereby improving the color cast problem of the display substrate. Further, since the lifetime of red light is longer than that of green light in a high-temperature environment, the thickness of the expansion layer 14a corresponding to the red light emitting device 13a is larger than that of the expansion layer 14b corresponding to the green light emitting device 13b when the kinds and concentrations of the thermal expansion materials doped in the expansion layers 14a, 14b are the same.
Illustratively, as shown in fig. 12 and 13, in the display substrate, the expansion layer 14a is provided on the periphery defining the opening of the red light emitting device 13a, the expansion layer 14b is provided on the periphery defining the opening of the green light emitting device 13b, and the expansion layer 14c is provided on the periphery defining the opening of the blue light emitting device 13 c. The brightness of the sub-pixels corresponding to the three light-emitting devices is adjusted by using the different expansion layers 14a, 14b and 14c, and the brightness of the sub-pixels corresponding to the three light-emitting devices can be synchronously adjusted, so that the efficiency of improving the color cast phenomenon of the display substrate is improved. Further, on the premise that the thicknesses of the expansion layers 14a, 14b, and 14c and the kinds of the doped thermal expansion materials are the same, the concentration of the thermal expansion material doped in the expansion layer 14a corresponding to the red light emitting device 13a is greater than the concentration of the thermal expansion material doped in the expansion layer 14b corresponding to the green light emitting device 13b, and the concentration of the thermal expansion material doped in the expansion layer 14b corresponding to the green light emitting device 13b is greater than the concentration of the thermal expansion material doped in the expansion layer 14c corresponding to the blue light emitting device 13 c. The selection of the type of the thermal expansion material with different expansion coefficients is based on the above-mentioned principle of the doping concentration of the thermal expansion material, and is not described herein again.
It is understood that specific parameters of the different expansion layers 14a, 14b, 14c, such as the thickness of the expansion layers 14a, 14b, 14c, the kind of thermal expansion material doped in the expansion layers 14a, 14b, 14c, and the concentration of the thermal expansion material doped in the expansion layers 14a, 14b, 14c, are designed according to the difference in the sensitivity to temperature of the red light emitting device 13a, the green light emitting device 13b, and the blue light emitting device 13 c. Based on the high-temperature performance attenuation of different light colors, the expansion layers 14a, 14b and 14c are doped with different concentrations or different thermal expansion materials, so that after the temperature of the use environment of the red, green and blue light is changed, the brightness of the sub-pixels corresponding to the three-color light-emitting device is changed to different degrees, and finally the displayed brightness is the same or similar, thereby effectively improving the color cast condition of the display substrate with the red, green and blue light. It should be understood that the design scheme of the expansion layer corresponding to the openings of the light emitting devices defining different colors is not limited to the above-described exemplary scheme, and various factors such as the specific case of color shift of the display substrate, process conditions, production costs, and product requirements may be comprehensively considered to select an appropriate technical scheme.
In some embodiments, the expansion layers 14a, 14b, 14c are formed by doping a thermally expansive material in the bulk film layer. Further, the thermal expansion material has a coefficient of expansion of 10 x 10 -6 1/k～200*10 -6 1/k. In the above scheme, the thermal expansion amount of the expansion layers 14a, 14b, and 14c can be determined by calculating the luminance of the sub-pixels corresponding to the light emitting devices required by the different light emitting devices to make the display substrate not color-cast or not seriously color-cast in a high temperature environment, so that the thermal expansion material with a proper thermal expansion coefficient is selected, and alignment can be accurately achievedAnd adjusting color cast of the display substrate.
Illustratively, as shown in fig. 14 and 15, the display substrate includes OLED devices that emit light of three colors of R (red), G (green), and B (blue), assuming that the red light-emitting device 13a and the green light-emitting device 13B are color-cast light-emitting devices. The expansion layers 14a and 14b are used to adjust the brightness of the sub-pixel corresponding to the red light-emitting device 13a and the brightness of the sub-pixel corresponding to the green light-emitting device 13b according to the temperature-changing attenuation of the RGB three-color light. In the case where the thicknesses of the expansion layers 14a and 14b are equal, the thermal expansion material doped in the expansion layer 14a corresponding to the red light emitting device 13a has an expansion coefficient of 100 × 10 -6 1/k～200*10 -6 1/k, the thermal expansion coefficient of the thermal expansion material doped in the expansion layer 14b corresponding to the green light emitting device 13b is 10 x 10 -6 1/k～50*10 -6 1/k. It can be understood that, on the premise that the thickness of the expansion layer and the type of the thermal expansion material are fixed, the larger the doping concentration of the thermal expansion material is, the larger the expanded volume of the expansion layer is, and the expanded volume of the expansion layer directly affects the brightness of the sub-pixels corresponding to the red light emitting device 13a and the green light emitting device 13b, so that the color cast condition of the display substrate can be effectively improved by adjusting the coefficient of the thermal expansion material doped in the expansion layers 14a and 14 b.
Therefore, thermal expansion materials with different concentrations can be doped according to the curve of the light emitting quantity of the light emitting device changing along with the temperature, namely the temperature change performance of the light emitting device is attenuated, and the thermal expansion materials with different concentrations and different expansion coefficients can be selected according to the temperature change performance of different light emitting devices, so that the problem of high-temperature color cast of the display substrate can be solved quickly and accurately, and the influence on the service life of the display substrate is reduced.
In some embodiments, the thermal expansion material is selected based on a high molecular polymer, which has the characteristics of excellent thermal expansion performance and wide selectable range of species, and the high molecular polymer can be preferentially selected as the material doped into the expansion layer. It will be appreciated that the particular doping of the thermally expansive material is selected according to practical requirements, for example: the material requiring high thermal expansion coefficient can be selected from ethylene-ethyl acrylate (2)05*10 -6 1/k), polyethylene (200 x 10) -6 1/k), ethylene-vinyl acetate copolymer (180 x 10) -6 1/k), etc. The material requiring a low coefficient of thermal expansion may be chosen from polyamides (110 x 10) -6 1/k), polycarbonate (70.2 x 10) -6 1/k), etc. Wherein, the thermal expansion amount calculation formula of the expansion layer is as follows: Δ L ═ α × L (Δ T); α is the coefficient of thermal expansion of the material; l is the initial length before expansion; Δ T: the temperature was varied.
For example, in at least one embodiment of the present application, the host film layer and the pixel defining layer are integrally formed. In the scheme, the integrated forming mode ensures that no physical interface exists between the main film layer and the film layer of the pixel definition layer, thereby avoiding the separation of the film layers, improving the stability of the film group structure and further prolonging the service life of the display substrate.
In some embodiments of the application, the end face of the intumescent layer facing away from the colour shifting pixel defining layer has a guiding structure on it configured to increase the surface area of the end face of the intumescent layer facing away from the substrate, i.e. such that the surface area of the surface of the intumescent layer facing away from the pixel defining layer is larger than the surface area of the surface of the intumescent layer facing towards the pixel defining layer. In the above scheme, when the temperature is high, the expansion layer expands, and at this time, the surface of the expansion layer of the guide structure expands along the corner extension of the guide structure, which is faster than that of the guide structure when the expansion layer extends on a plane, and the design of the guide structure enables the expansion layer to expand towards the direction of the opening adjacent to the expansion layer, so that the expansion of the expansion layer towards the direction far away from the substrate relative to the pixel defining layer is reduced, the brightness of the sub-pixel corresponding to the light-emitting device can be more effectively adjusted, and the color cast condition of the display substrate is efficiently improved.
For example, in some embodiments, the guide structure may be a plurality of projections. Further, the protrusion may be a linear protrusion, and an extending direction of the linear protrusion is substantially parallel to a side of the corresponding opening. Illustratively, as shown in fig. 16 and 17, a plurality of linear protrusions, for example, three linear protrusions 141 are provided on the expansion layer 14a defining the arrangement of the opening of the red light emitting device 13a, and the plurality of (three) linear protrusions 141 are parallel to each other and substantially parallel to the side of the opening. The design of the guide structure in the scheme can improve the expansion speed of the expansion layer 14a towards the opening direction, so that the efficiency of improving the color cast problem of the display substrate or the display panel is improved, the stress between the expansion layer 14a and the pixel defining layer during expansion can be reduced, the separation between the pixel defining layer and the expansion layer 14a is reduced, and the service life of the display substrate or the display panel is prolonged.
For example, in other embodiments, the guide structure may be a plurality of grooves. Further, the grooves may be linear grooves, and the linear grooves cross each other to constitute a cross shape and/or a well shape. Illustratively, as shown in fig. 18 and 19, a plurality of linear grooves 141 are provided on the expansion layer 14a defining the arrangement of the openings of the red light emitting devices 13a, and two transversely extending linear grooves and two longitudinally extending linear grooves cross each other to have four crossing points, thereby forming a plurality of "well" shapes. During the high temperature, in the inflation process of inflation layer 14a, the interior boundary surface of linear recess outwards extends towards a plurality of directions, not only can improve the inflation speed of inflation layer 14a to the opening direction, can also make the inflation layer atress even, when improving the joint strength on inflation layer and pixel definition layer, has reduced the image of inflation layer inflation to the negative pole, consequently can improve the display substrate colour cast problem high-efficiently, can also improve the life of display substrate. It should be noted that the cross shape may be formed by a cross of a linear groove extending in the transverse direction and a linear groove extending in the longitudinal direction, and has a cross point.
It should be understood that the guiding structure is not limited to the groove structure and the protrusion structure defined in the above embodiments, and the design may be selected according to actual situations, so that the groove and the protrusion have different structures, such as a U-shape or other shapes.
In some embodiments of the present application, the expansion layer is of a light-shielding structure, so that during the expansion of the expansion layer, the aperture ratio of the corresponding sub-pixel is actually reduced to reduce the light-emitting brightness of the sub-pixel, and thus, the requirement on the expansion amplitude of the expansion layer is reduced, thereby reducing the requirement on the design parameters of the expansion layer, for example, the thickness and width of the expansion layer and the concentration of the doped expansion material can be reduced.
In other embodiments of the present application, the intumescent layer is a translucent structure. Further, the transparency of the intumescent layer is between 30% and 50%. In the above scheme, by adjusting the transparency of the expansion layer, the intensity of light passing through the expansion layer itself can be adjusted, so that the brightness of the corresponding sub-pixels of the light emitting device in the opening with the expansion layer arranged at the periphery is adjusted, and the phenomenon of color cast of the display substrate can be accurately improved. In this embodiment, even after the expansion layer is expanded, the region of the sub-pixel blocked by the expansion layer can emit light (only the brightness of the light emitted from the region is reduced), that is, even when the expansion layer is expanded, the aperture ratio of the sub-pixel can be maintained unchanged.
It should be understood that the light emitting functional layer in the above-mentioned light emitting device includes at least an emission layer (EML), and may further include other functional layers such as a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an Electron Blocking Layer (EBL), a Hole Blocking Layer (HBL), an Electron Transport Layer (ETL), an Electron Injection Layer (EIL), and the like.
The embodiment of the present application further provides a display panel, which includes any one of the display substrates according to the above embodiments of the present application.
For example, the display panel provided in at least one embodiment of the present application may further include a touch structure to have a touch function. For example, the touch structure may be a touch panel or a touch layer, and the touch panel may be disposed on the display substrate in a bonding manner, for example, disposed on a light emitting side of the display substrate; the touch layer can be directly prepared on the display substrate, so that the light and thin design of the display panel is facilitated.
For example, the display panel in the embodiments of the present application may be any product or component having a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a notebook computer, and a navigator.
The embodiment of the application also provides a manufacturing method of the display substrate. The manufacturing method can be used for manufacturing the display substrate in the above-described embodiments of the present application. It should be understood that the embodiments of the manufacturing method correspond to the embodiments of the display substrate one to one, and repeated descriptions are appropriately omitted for the sake of brevity.
The manufacturing method includes steps S110 to S140.
In step S110, a substrate is provided.
In step S120, a pixel defining layer including a plurality of openings is formed on one side of the substrate. Wherein, a pixel defining layer is formed by adopting a photoetching process. Further, the thickness of the pixel defining layer is 0.8um to 1.2 um.
In step S130, a plurality of light emitting devices are formed. Here, the light emitting devices are defined in the openings of the pixel defining layer, and some of the plurality of light emitting devices are color-cast light emitting devices.
In step S140, an expansion layer is formed on a side of the pixel defining layer facing away from the substrate, and the expansion layer at least partially surrounds the opening defining the color cast light emitting device. Further, the thickness of the expansion layer is 0.7 um-0.9 um.
In step S140, a cathode is formed on a side of the pixel defining layer and the expansion layer away from the substrate, or a cathode is formed on a side of the expansion layer away from the substrate.
In some embodiments, in step S140, forming an expansion layer on a side of the pixel defining layer facing away from the substrate, the expansion layer at least partially surrounding the opening defining the color cast light emitting device, includes:
in step S141, the temperature-change performance decay of the light-emitting device is determined according to the color shift of the display substrate, and the color-shift light-emitting device is determined. This step is used to determine which light emitting devices need to have an expansion layer around their perimeter to change the brightness of their corresponding sub-pixels.
In step S142, an expansion layer is formed by doping a thermal expansion material on an end surface of the pixel defining layer away from the substrate, the end surface defining the periphery of the opening of the color-shifting light emitting device.
In some embodiments, in step S142, doping a thermal expansion material on an end surface, away from the substrate, of the pixel defining layer defining a periphery of the opening of the color-shifting light emitting device to form an expansion layer includes: and calculating the temperature change performance attenuation of the color cast light-emitting device, and determining the expansion coefficient and the doping concentration of the doped thermal expansion material according to the calculation result. This design can accurate promotion display panel's high temperature color cast problem. And depositing a thermal expansion material on the same end face of the main body as the pixel defining layer, and performing a secondary photoetching process to form an expansion layer above the pixel defining layer.
It should be understood that the above description is only given by way of example, and the preparation of the expansion layer in the present application is not limited to the above description, and may be formed by doping the thermal expansion material using the pixel defining layer as a main body, which may be selected and designed according to specific production conditions.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A display substrate, comprising:
a substrate;
a pixel defining layer on the substrate and including a plurality of openings;
a plurality of light emitting devices defined in the openings, and a portion of the light emitting devices being color-shifted light emitting devices; and
an expansion layer on a side of the pixel defining layer facing away from the substrate;
wherein at least a portion of the intumescent layer surrounds the opening defining the primary color light emitting device.
2. The display substrate of claim 1,
the shape of the orthographic projection of the part of the expansion layer surrounding the opening on the surface of the substrate is a straight line segment shape; or
The orthographic projection of the part of the expansion layer surrounding the opening on the surface of the substrate is in a non-closed annular shape; or
The shape of the orthographic projection of the part of the expansion layer surrounding the opening on the surface of the substrate is a closed ring.
3. The display substrate of claim 1,
providing the expansion layer only at a periphery of the opening defining the color cast light emitting device; or
The expansion layer is arranged on the periphery of each opening, and the expansion coefficient of a part of the expansion layer surrounding the color cast light-emitting device is larger than that of a part surrounding other light-emitting devices.
4. The display substrate of claim 3,
the expansion layer is formed by doping a thermal expansion material in the main film layer,
preferably, the body film layer and the pixel defining layer are integrally formed,
preferably, the coefficient of expansion of the thermally expandable material is 10 x 10 -6 1/k～200*10 -6 1/k。
5. The display substrate according to any one of claims 1-4, wherein an end face of the expansion layer facing away from the color-shifting pixel definition layer has a guiding structure configured to increase a surface area of the end face of the expansion layer facing away from the substrate.
6. The display substrate of claim 5,
the guide structure is a plurality of protrusions, preferably, the protrusions are linear protrusions, and the extension direction of the linear protrusions is substantially parallel to the corresponding edge of the opening; or
The guide structure is a plurality of grooves, preferably, the grooves are linear grooves, and the linear grooves intersect with each other to form a cross shape and/or a well shape.
7. The display substrate according to any one of claims 1 to 4,
the expansion layer is of a translucent structure,
preferably, the transparency of the intumescent layer is between 30% and 50%.
8. The display substrate according to any one of claims 1 to 4, wherein the light-emitting device further comprises a cathode covering the pixel defining layer and the opening, and
the material of the cathode is a ductile electrode material,
preferably, the ductile electrode material comprises any one or a combination of silver, metal nanowires, carbon nanotubes, and graphene.
9. The display substrate of claim 8, wherein an edge of an orthographic projection of the cathode on the surface of the substrate is curved,
preferably, the curved shape is a zigzag shape or a wave shape.
10. A display panel comprising the display substrate according to any one of claims 1 to 9.
CN202210379906.3A 2022-04-12 2022-04-12 Display substrate and display panel Pending CN114823826A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116761472A (en) * 2023-07-31 2023-09-15 惠科股份有限公司 Display panel and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116761472A (en) * 2023-07-31 2023-09-15 惠科股份有限公司 Display panel and display device

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