CN114914286A - Display substrate and display device - Google Patents

Display substrate and display device Download PDF

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Publication number
CN114914286A
CN114914286A CN202210759789.3A CN202210759789A CN114914286A CN 114914286 A CN114914286 A CN 114914286A CN 202210759789 A CN202210759789 A CN 202210759789A CN 114914286 A CN114914286 A CN 114914286A
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China
Prior art keywords
light emitting
emitting devices
substrate
display
circuit
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CN202210759789.3A
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Chinese (zh)
Inventor
李洪瑞
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Yungu Guan Technology Co Ltd
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Yungu Guan Technology Co Ltd
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Priority to CN202210759789.3A priority Critical patent/CN114914286A/en
Publication of CN114914286A publication Critical patent/CN114914286A/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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H10K50/813—Anodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel 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
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • 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
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H10K59/1315—Interconnections, e.g. wiring lines or terminals comprising structures specially adapted for lowering the resistance

Abstract

The application provides a display substrate and a display device. The display substrate includes a substrate, a light emitting device layer including a plurality of light emitting devices and positioned on the substrate, and a driving circuit layer. The driving circuit layer is disposed between the substrate and the light emitting device layer, and includes a plurality of initialization circuits and a plurality of pixel driving circuits for driving the plurality of light emitting devices, respectively. At least two pixel driving circuits for driving the light-emitting devices with the same light-emitting color share one initialization circuit, so that the problem of color rendering confusion caused by the initialization circuit shared by the light-emitting devices is solved while the wiring design is simplified.

Description

Display substrate and display device
Technical Field
The application relates to the technical field of display, in particular to a display substrate and a display device with the same.
Background
In the full-screen technology, the full-screen also comprises a functional area which is divided according to functional requirements besides a display area which can realize a display function, the functional area can meet the normal display function and simultaneously can realize other functions, such as functions of shooting under the screen or fingerprint identification under the screen, and the like, so that certain requirements are provided for the transmittance of the functional area. However, due to the limited process capability and the difference of the driving schemes, when the requirement of the transmittance of the functional region is satisfied as much as possible, the display pixel density (Pixels Per inc, abbreviated as PPI) of the functional region is reduced, which causes the difference between the display effect of the functional region and the display effect of the display region, thereby affecting the visual experience of the user.
Disclosure of Invention
The application provides a display substrate and a display device, which simplify the wiring design and simultaneously improve the problem of color rendering confusion of a common initialization circuit of a light-emitting device.
A first aspect of the present application provides a display substrate. The display substrate includes a substrate, a light emitting device layer on the substrate, and a driving circuit layer including a plurality of light emitting devices. The driving circuit layer is disposed between the substrate and the light emitting device layer, and includes a plurality of initialization circuits and a plurality of pixel driving circuits for driving the plurality of light emitting devices, respectively. At least two pixel driving circuits for driving light emitting devices of the same emission color share one initialization circuit.
In the scheme, the pixel driving circuits of the light emitting devices with the same emergent light color share one initialization circuit, so that the problem of color rendering confusion caused by the fact that the initialization circuit is shared among the light emitting devices is solved while the wiring design is simplified.
With reference to the first aspect, in some embodiments, the plurality of light emitting devices include at least two light emitting devices different in emission color, the light emitting device layer includes a plurality of pixel units, each pixel unit includes a plurality of light emitting devices different in emission color, and the light emitting devices driven by the pixel driving circuits sharing the same initialization circuit are located in adjacent pixel units.
In the above scheme, the pixel units where the light emitting devices of the pixel driving circuits sharing the same initialization circuit are located are arranged adjacently, so that the wiring design is further simplified, the transmittance of the second display area is further improved, and the visual experience of a user is further improved.
Alternatively, a light emitting device of a different color from that of a light emitting device driven by at least two pixel driving circuits sharing the same initialization circuit is provided therebetween.
Alternatively, at least two pixel driving circuits sharing the same initialization circuit are disposed adjacently.
In the above-described aspect, by making the pixel drive circuits corresponding to the light emitting devices that do not share one initialization circuit adjacent, the wiring design between the shared initialization circuit and the pixel drive circuits can be simplified.
With reference to the first aspect, in some embodiments, the display substrate further includes a first display region and a second display region, and the light transmittance of the first display region is smaller than that of the second display region. At least two pixel driving circuits sharing the initialization circuit are located in the second display area, or at least two pixel driving circuits sharing the initialization circuit are located in the first display area and the second display area.
In the above scheme, through the design of the initialization circuit in the common pixel driving circuit, the area occupied by the circuit structure of the second display area in the driving circuit layer is simplified, and the transmittance of the second display area is improved, so that the display effect of the second display area is improved, and the visual experience of a user is further improved.
With reference to the first aspect, in some embodiments, a common initialization circuit is provided within the first display area and/or within the second display area.
In the above scheme, the common initialization circuit is flexibly arranged, so that the preparation of the display substrate is facilitated, the transmittance of the second display area can be improved to different degrees, and particularly, when the common initialization circuit is arranged in the first display area, the transmittance of the second display area can be improved to a greater extent.
In combination with the first aspect, in some embodiments, the light emitting device includes an anode, a light emitting layer, and a cathode stacked on the driving circuit layer, and in the second display area, at least a part of an orthogonal projection of the common initialization circuit on the substrate is located within an orthogonal projection of the anode on the substrate.
In the above scheme, the initialization circuit is configured to be partially or completely shielded by the anode of any one of the light emitting devices, which further reduces the area of the non-transparent region in the second display region, thereby increasing the transmittance of the second display region and effectively reducing the influence of the second display region on the visual experience of the user.
With reference to the first aspect, in some embodiments, in the second display region, an orthogonal projection of the pixel drive circuit on the substrate is located within an orthogonal projection of the anode on the substrate.
In the above scheme, the pixel driving circuit is configured to be shielded by the anode, so that the occupied area of the non-transparent structure in the driving circuit layer is reduced, the transmittance of the second display area is increased, and the user experience is improved.
With reference to the first aspect, in some embodiments, orthographic projections of at least two pixel driving circuits sharing the same initialization circuit on the substrate are respectively located within orthographic projections of anodes of light emitting devices of different light emitting colors and adjacent positions on the substrate.
Optionally, the orthographic projection of at least one of the at least two pixel driving circuits sharing the same initialization circuit on the substrate is within the orthographic projection of the anode of the light emitting device driven by the pixel driving circuit on the substrate.
With reference to the first aspect, in some embodiments, the initialization circuit is configured to initialize the light emitting device. And/or the pixel driving circuit comprises a driving transistor, the driving transistor is used for generating driving current to drive the light-emitting device to emit light, and the initialization circuit is used for initializing the control electrode of the driving transistor.
With reference to the first aspect, in some embodiments, the initialization circuit includes a first reset transistor and/or a second reset transistor. A first electrode of the first reset transistor is electrically connected to the first reference voltage signal line, a second electrode of the first reset transistor is electrically connected to the first electrode of the light emitting device, and a control electrode of the first reset transistor is electrically connected to the first scan signal line. A first pole of the second reset transistor is electrically connected with the first reference voltage signal line, and a second pole of the second reset transistor is electrically connected with the control electrode of the driving transistor; the control electrode of the second reset transistor is electrically connected with the second scanning signal line.
With reference to the first aspect, in some embodiments, the driving circuit layer further includes a plurality of signal lines electrically connected to at least one of the initialization circuit and the pixel driving circuit.
At least one signal line includes a non-transparent trace and a transparent trace connected to each other, the non-transparent trace being located within an orthographic projection of the light emitting device on the substrate.
In the above-described aspect, the light transmittance between the light emitting devices in the second display region may be improved by setting a portion of the signal line between the adjacent two light emitting devices to be transparent. And the transparent wires and the non-transparent wires are combined for use, so that the light blocking of the signal wires can be reduced, and meanwhile, the impedance generated on the signal wires can be reduced. In addition, by improving the transparency of the signal lines in this region, the optical diffraction phenomenon caused by the arranged non-transparent signal lines can be reduced or eliminated.
With reference to the first aspect, in some embodiments, two ends of the transparent trace are respectively in direct contact with different non-transparent traces.
In the scheme, the connection mode of the transparent wires and the non-transparent wires simplifies the wiring design process and saves the production cost.
In combination with the first aspect, in some embodiments, the plurality of light emitting devices are arranged in an array of a plurality of rows and a plurality of columns, in each row of light emitting devices, the extending direction of at least some of the light emitting devices forms an angle α with the row direction, and 5 ° α or more and 45 ° or less, and in each column of light emitting devices, the extending direction of at least some of the light emitting devices forms an angle β with the column direction, and 5 ° β or more and 45 ° or less. The length of the light emitting device in the extending direction is greater than the length of the light emitting device in the other direction.
In some embodiments, in combination with the first aspect, adjacent light emitting devices in each row of light emitting devices are splayed, and/or adjacent light emitting devices in each column of light emitting devices are splayed.
In the scheme, the design of the included angles alpha and beta improves the diffraction effect of light, and the visual effect of the second display area is further improved.
In combination with the first aspect, in some embodiments, the light emitting device layer includes a pixel defining layer, the light emitting device includes an anode, a light emitting layer, and a cathode stacked on the driving circuit layer, the pixel defining layer covers the anode and has an opening exposing the anode, the light emitting layer is located in the opening, the cathode is located on a side of the pixel defining layer facing away from the substrate, the anode is configured with an anode pattern, the opening exposes at least a portion of the anode pattern, and the anode pattern includes a circle, an ellipse, or a polygon.
In the above scheme, the arrangement of the anode patterns improves the diffraction effect of the display substrate, so that the display effect is improved, and the user experience is improved.
A second aspect of the present application provides a display device comprising any one of the display substrates provided in the first aspect above.
Drawings
Fig. 1 is a schematic top view of a display substrate according to an embodiment of the present application.
Fig. 2 is a schematic top view of a second display area of a display substrate according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of an array arrangement of light emitting devices in a second display region of a display substrate according to an embodiment of the present disclosure.
FIG. 4 is a cross-sectional view of M1N1 of FIG. 3 of the present application.
Fig. 5 is a cross-sectional view of M2N2 of fig. 3 of the present application.
Fig. 6 is a schematic diagram of a pixel driving circuit of a common initialization circuit according to an embodiment of the present application.
Fig. 7 is a schematic diagram of traces between light emitting devices according to an embodiment of the present application.
Fig. 8 is a schematic diagram of traces between light emitting devices according to another embodiment of the present application.
Fig. 9 is a schematic diagram of traces between light emitting devices according to another embodiment of the present application.
Fig. 10 is an enlarged view of one signal line in the display substrate according to an embodiment of the present application.
Fig. 11 is an enlarged view of one signal line in the display substrate according to an embodiment of the present application.
Fig. 12 is a cross-sectional view of a second display region of a display substrate according to another embodiment of the present application.
Fig. 13 is a pixel array distribution diagram of a second display area of a display substrate according to another embodiment of the present application.
Fig. 14 is a pixel array distribution diagram of a second display area of a display substrate according to another embodiment of the present application.
Fig. 15 is a 9MASK process structure diagram of a display substrate according to another embodiment of the present application.
Fig. 16 is a modified process structure view of a display substrate according to another embodiment of the present application.
Fig. 17 is a modified process structure diagram of a display substrate according to another embodiment of the present application.
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 some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The design concept of the comprehensive screen can be faced with the condition of combining functions of fingerprint identification under the screen or camera shooting under the screen, namely, the display function is also realized in the specific functional area of the fingerprint identification under the screen or the camera under the screen, so that the full screen display can be realized in the real sense by the display screen. Therefore, the specific functional regions still need to be provided with pixels and corresponding driving circuits, the structures can block light, and the routing in the driving circuits can cause diffraction or interference phenomena, so that the effect of fingerprint identification under the screen or the effect of a camera under the screen can be reduced.
In some full-screen designs, the pixel density and the pixel size in the specific functional region may be reduced to increase the light transmittance of the functional region, but this may reduce the PPI of the display substrate and the luminance of the pixel, thereby reducing the display effect of the functional region.
In view of the above, the present application provides a display substrate and a display device, which can at least solve the above technical problems. The display substrate includes a substrate, a light emitting device layer, and a driving circuit layer. The light emitting device layer includes a plurality of light emitting devices and is on the substrate. The driving circuit layer is disposed between the substrate and the light emitting device layer and includes a plurality of initialization circuits and a plurality of pixel driving circuits for driving the plurality of light emitting devices, respectively. At least two pixel driving circuits for driving light emitting devices of the same emission color share one initialization circuit.
Therefore, by optimizing the circuit structure in the driving circuit layer, the pixel driving circuits of the light emitting devices with the same emergent light color share one initial circuit, the area occupied by the circuit structure in the driving circuit layer is simplified, and further, under the condition that the PPI of the display substrate is not changed, the display effect of the display substrate is better, and the problem of disordered display of the light emitting devices cannot occur.
In some embodiments, the plurality of light emitting devices include at least two light emitting devices different in emission color, the light emitting device layer includes a plurality of pixel units each including a plurality of light emitting devices different in emission color, and the light emitting devices driven by the pixel driving circuits sharing the same initialization circuit are located in adjacent pixel units.
Next, the structure of a display substrate and a display panel provided in at least one embodiment of the present application will be described with reference to the drawings.
As shown in fig. 1, 2 and 4, the display area of the display substrate 100 includes a first display area 101 and a second display area 102, the display substrate 100 includes a substrate 1, a light emitting device layer 5 and a driving circuit layer 4, and a plurality of light emitting devices 103 and a plurality of signal lines 104 are disposed in the display area, the plurality of light emitting devices 103 being arranged in the display area according to a specified rule. The light emitting devices are the smallest units for performing picture display within the display panel so that each light emitting device can display a single color, for example, red, green, blue, or the like. A plurality of light emitting devices of different colors may constitute one pixel unit.
In some embodiments, the plurality of light emitting devices include at least two light emitting devices different in emission color, the light emitting device layer includes a plurality of pixel units each including at least two light emitting devices different in emission color, and the light emitting devices driven by the pixel driving circuits sharing the same initialization circuit are located in adjacent pixel units.
The display substrate includes a plurality of light emitting devices emitting light of different colors arranged in an array. At least two pixel driving circuits of light emitting devices emitting the same color share one initialization circuit. Pixel driving circuits that drive light emitting devices of different colors are electrically connected to different initialization circuits. The pixel driving circuits sharing the same initializing circuit are electrically connected to the same initializing circuit. The pixel driving circuits that do not share the same initialization circuit may be electrically connected to different initialization circuits. Therefore, the wiring design of the display substrate is simplified, and the problem of display disorder of the light-emitting device is improved.
The display substrate can adopt different pixel arrangement modes, namely different arrangement modes of the light-emitting devices. The light emitting devices driven by the pixel driving circuits sharing the same initialization circuit can be located in the same row or in the same column. The light emitting devices driven by the pixel driving circuits sharing the same initialization circuit may be located in different rows and at the same time in different columns. The number of light emitting devices driven by the pixel driving circuit sharing the same initialization circuit may be two. The light emitting devices driven by the pixel driving circuits sharing the same initialization circuit are positioned in two adjacent rows and are positioned in two adjacent columns at the same time, and the light emitting devices are positioned in different rows and different columns. In at least one embodiment, a light emitting device different in color from a light emitting device driven by at least two pixel driving circuits sharing the same initialization circuit is provided therebetween. In at least one embodiment, at least two pixel driving circuits sharing the same initialization circuit are disposed adjacent without other pixel driving circuits therebetween. According to the arrangement of the light emitting devices of the display substrate, the pixel driving circuits corresponding to the light emitting devices emitting light with the same color share one initialization circuit, and the applicability of the method is improved.
A display substrate is provided below which includes light emitting devices emitting three colors of red, green, and blue, and the light emitting devices emitting the three colors of light are arrayed and repeatedly distributed in a row direction and a column direction as shown in fig. 3 to form a plurality of pixel units of the display substrate. Specifically, the design scheme of the present application is described in detail by taking the display substrate shown in fig. 3 as an example. In fig. 3, the line of centroids of three light emitting devices (red light emitting device R, green light emitting device G, and blue light emitting device B) in one light emitting unit is a triangle, and the three light emitting devices are adjacently disposed.
In the first scheme, in the case where the pixel driving circuits of the same-color light emitting devices in the pixel units adjacent in the row direction share the initializing circuit in the display substrate. The light emitting devices of the same color may be any one of red, green, or blue. The following describes the present scheme in detail by taking the color of light emitted from the light emitting device as red as an example.
Illustratively, as shown in fig. 4, the light emitting device layer 5 of the display substrate is located on the substrate 1, the driving circuit layer 4 is located between the substrate 1 and the light emitting device layer 5, the red pixel driving circuits 9a (only one thin film transistor in the pixel driving circuit is illustrated in the figure) of three red light emitting devices 7a adjacent in the row direction share one initialization circuit 10, i.e., the first common initialization circuit 10 (only one thin film transistor in the initialization circuit is illustrated in the figure), and the red pixel driving circuits 9a of different red light emitting devices 7a are adjacent. It should be understood that the lines in the figure only represent the circuit connection relationship between the different red pixel driving circuits 9a and the initialization circuit 10, and the specific circuit trace design is designed according to actual requirements.
It should be understood that the technical solution of sharing one initialization circuit by at least two light emitting devices emitting light with the same color is not limited to the above example, and two or four or other numbers of light emitting devices of the red light emitting device 7a adjacent in the row direction may share the first shared initialization circuit 10 in the driving circuit layer 4, or a different number of pixel driving circuits of the green light emitting device or the blue light emitting device adjacent in the row direction may share one initialization circuit 10, which may be designed selectively according to actual requirements.
In the second scheme, in the display substrate, between the light emitting devices arranged in the column direction, two adjacent light emitting devices emit light of different colors, the light emitting devices with the same emission color that are not adjacent may share one initialization circuit, and the light emitting devices with the same emission color that are not adjacent are located in adjacent pixel units, and the following takes as an example that two red light emitting devices that are not adjacent in the column direction share one initialization circuit, which will be described in detail in this application.
Illustratively, as shown in fig. 5, the light emitting device layer 5 is located on the substrate 1, and the driving circuit layer 4 is located between the substrate 1 and the light emitting device layer 5, and includes an initialization circuit 11 and pixel driving circuits 9a, 9b, 9 c. In the adjacent pixel unit, two red light emitting devices 7a which are not adjacent share one initializing circuit 11, i.e., a second common initializing circuit 11. Specifically, two red pixel driving circuits 9a and their corresponding second common initializing circuits 11 that drive the red light emitting devices 7a, a green pixel driving circuit 9b and its corresponding initializing circuit (not shown) that drive the green light emitting devices 7b, and a blue pixel driving circuit 9c and its corresponding initializing circuit (not shown) that drive the blue light emitting devices 7 c. Also, the red pixel drive circuits 9a that drive the red light emitting devices 7a that are not adjacent are disposed adjacent, that is, the pixel drive circuit 9a that drives the red light emitting device 7a on the right side is switched in position with the green pixel drive circuit 9b that drives the green light emitting device 7b, which reduces the difficulty of wiring design between the second common initialization circuit 11 and the two red pixel drive circuits 9 a. Moreover, fig. 5 only shows the relationship of position replacement between the red pixel driving circuit 9a and the green pixel driving circuit 9b, the wiring connection is not specifically shown in the figure, and the connection relationship among different pixel driving circuits, anodes, and initialization circuits is designed according to the actual situation, which is not shown in the figure. Since the connection between the pixel driving circuit and the initializing circuit is complicated and the connection between the pixel driving circuit and the light emitting device is simple, the pixel driving circuits sharing the same initializing circuit are arranged adjacent to each other, and the wiring can be simplified.
It is to be understood that the method of arranging the green pixel drive circuit 9b is not limited to exchanging the positions with the red pixel drive circuit 9a, and it is also possible to sequentially move the green pixel drive circuit 9b that drives the green light emitting device 7b to the position of the blue pixel drive circuit 9c adjacent thereto (equivalent to positioning the green pixel drive circuit 9b under the blue light emitting device 7 c), and sequentially move the blue pixel drive circuit 9c to the position of the next adjacent red pixel drive circuit 9a (equivalent to positioning the blue pixel drive circuit 9c under the red light emitting device 7a on the right side). The circuit connection relationship between the pixel driving circuits 9a, 9b, and 9c and the initialization circuit 11 is not specifically shown, and the specific circuit trace design is designed according to actual requirements.
In the above scheme, only red, green and blue sub-pixels are taken as an example to give a group of light emitting devices emitting the same color in two adjacent pixel units to share one initialization circuit, but the number of the types and specific colors of all colors of the light emitting devices in the display substrate in practical application are not limited to the scheme in the above example, and other schemes may also be used, for example, the light emitting devices emitting the same color in three or more pixel units share one initialization circuit, or two or more groups of light emitting devices emitting the same color in a plurality of pixel units share one initialization circuit, which may be designed according to the principle of the scheme given in conjunction with fig. 5, and thus, no further description is given here.
The display substrate may be selectively set to a top emission mode or a bottom emission mode, and in the case of designing to the top emission mode, the anode of the light emitting device may be set to a reflective electrode. Thus, the position of the initialization circuit can be arranged to enable the initialization circuit to be shielded by the anode, so that the shielding of the initialization circuit to light is further reduced, and the light transmittance of the second display area is improved.
In addition to designing the corresponding relationship between the pixel driving circuit and the initialization circuit in the display substrate, the present application also specifically designs the installation position of the common initialization circuit.
In some embodiments, the display substrate further includes a first display region and a second display region, the light transmittance of the first display region is smaller than that of the second display region, the at least two pixel driving circuits sharing the initialization circuit are located in the second display region, or the at least two pixel driving circuits sharing the initialization circuit are located in the first display region and the second display region. This improves the light transmittance of the second display region in the display substrate. And the pixel driving circuits of the shared initialization circuit are adjacent, so that the wiring difficulty in the second display area is reduced, and the production cost is saved.
For example, as shown in fig. 1, the common initialization circuit may be disposed in the first display area 101 and around the second display area 101, so as to further simplify the circuit design in the second display area, increase the transparent area in the second display area, and improve the display effect of the second display area. Without being limited thereto, for example, as shown in fig. 3 and 5, the common initial circuits 10 and 11 may be disposed in the second display region, which is more advantageous in terms of the wiring design between them and the corresponding pixel driving circuits. By combining the designs of fig. 1, fig. 4 and fig. 5, according to actual requirements, a part of the shared initialization circuit can be disposed in the first display area, and another part of the shared initialization circuit can be disposed in the second display area, so that the design is flexible, the transmittance of the second display area is improved, and meanwhile, the design is favorable for the production design of the display substrate, and the production cost is saved.
It should be understood that the first display area is a main display area, and the second display area may be a transparent area or a functional area, such as a fingerprint recognition functional area or an off-screen camera functional area, which may be designed according to actual situations, and is not limited herein.
In order to further improve the transmittance of the second display region, in some embodiments, each of the light emitting devices includes an anode, a light emitting layer, and a cathode stacked on the driving circuit layer, and in the second display region, an orthogonal projection of the common initialization circuit on the substrate overlaps an orthogonal projection of the anode on the substrate. Optionally, the orthogonal projection of the common initialization circuit on the substrate is located within the orthogonal projection of the anode on the substrate. In this way, the total area of the non-transparent structures in the display substrate is reduced, which leads to an improvement in the problem of the transmittance of the display substrate being affected because the anode in the display substrate and the circuitry in the driving circuit layer are non-transparent.
Exemplarily, as shown in fig. 5, in the same pixel, the light emitting device of each color is provided with the anode 8a, 8b, 8c, the light emitting layer and the cathode 6 on the driving circuit layer 4, the second common initialization circuit 11 shared by the red light emitting devices 7a in the adjacent pixel units is disposed below the anode 8a of the left red light emitting device 7a, and the orthogonal projection of the second common initialization circuit 11 on the substrate 1 is located in the orthogonal projection of the anode 8a of the left red light emitting device 7a on the substrate 1, i.e., the second common initialization circuit 11 is completely shielded by the anode 8a of the left red light emitting device 7a, increasing the area of the non-light emitting region, thereby increasing the transmittance of the second display region.
In addition to the location scheme for designing the initialization circuit to increase the transmittance of the second display area, in some embodiments, the orthographic projection of the pixel drive circuits on the substrate overlaps with the orthographic projection of the anodes on the substrate in the second display area. Optionally, in the second display area, the orthographic projection of the pixel driving circuit on the substrate is located within the orthographic projection of the anode on the substrate. Therefore, the non-transparent structure, such as the anode and the pixel driving circuit, in the driving circuit layer in the second display area are overlapped as much as possible, the occupied area of the non-transparent structure in the driving circuit layer is reduced, the transmittance of the second display area is increased, and the shooting effect of the camera is improved.
In addition, the effect of improving the transmittance of the second display area can also be achieved by designing the pixel driving circuits corresponding to different light-emitting devices, and in some embodiments, the orthographic projections of at least two adjacent pixel driving circuits sharing the same initialization circuit on the substrate are respectively overlapped with the orthographic projections of the anodes of the light-emitting devices with different light-emitting colors and adjacent positions on the substrate. Alternatively, the orthographic projections of at least two adjacently arranged pixel driving circuits sharing the same initialization circuit on the substrate are respectively located in the orthographic projections of the anodes of the light emitting devices with different light emitting colors and adjacent positions on the substrate, for example, 2 pixel driving circuits 9a in fig. 5 are respectively located below the anode 8a and the anode 8 b. In at least one embodiment, the orthographic projection of at least one of the at least two pixel driving circuits sharing the same initialization circuit on the substrate overlaps with the orthographic projection of the anode of the light emitting device driven by the pixel driving circuit on the substrate. Alternatively, the orthogonal projection of at least one of the at least two pixel drive circuits sharing the same initialization circuit on the substrate is located within the orthogonal projection of the anode of the light emitting device driven by it on the substrate, as shown in fig. 5 with the left pixel drive circuit 9a located below the anode 8 a.
That is, the light emitting devices corresponding to the pixel driving circuits that share one initializing circuit are divided into one group. In the adjacent group of the light emitting devices, the orthographic projection of the pixel driving circuit corresponding to each light emitting device on the substrate is within the orthographic projection of the anode of each light emitting device on the substrate. In a group in which the light emitting devices are not adjacent, the orthogonal projection of the pixel drive circuit corresponding to one light emitting device on the substrate is located within the orthogonal projection of the anode of the light emitting device adjacent to another light emitting device in the same group and emitting light of another color on the substrate. Also, the pixel driving circuits corresponding to the light emitting devices of the same group may be located in different pixel units or in the same pixel unit, depending on the arrangement of the light emitting devices emitting light of different colors in the pixel unit and the positions of the light emitting devices sharing the initialization circuit.
Illustratively, as shown in fig. 5, each color light emitting device is provided with an anode 8a, 8b, 8c, a light emitting layer and a cathode 6 on the driving circuit layer 4, and the second initialization circuit 11 shared by the red light emitting devices 7a in the adjacent pixel units is shielded by the anode 8a of the red light emitting device 7a on the left side, while one of the red pixel driving circuits 9a driving the red light emitting device 7a to emit light is within the projection of the anode 8a of the red light emitting device 7a on the left side on the substrate 1 in the orthographic projection of the substrate 1, the other one of the red pixel driving circuits 9a driving the red light emitting device 7a to emit light is within the projection of the anode 8b of the green light emitting device 7b on the substrate 1 in the orthographic projection of the substrate 1, and the green pixel driving circuit 9b driving the green light emitting device 7b to emit light is within the projection of the anode 8a of the red light emitting device 7a on the substrate 1 on the right side in the adjacent pixel units Within the projection, the orthogonal projection of the blue pixel drive circuit 9c, which drives the blue light emitting device 7c to emit light, on the substrate 1 is located within the projection of the anode 8c of the blue light emitting device 7c on the substrate 1. In this way, the second common initialization circuit 11 and the pixel driving circuits 9a, 9b, and 9c in the driving circuit layer 4, which are used for sharing the red light emitting devices 7a in the adjacent pixel units, are all configured to be shielded by the anodes 8a, 8b, and 8c, which greatly reduces the occupied area of the opaque structures in the total area of the pixels, and improves the transmittance of the second display area.
In some embodiments, an initialization circuit is used to initialize the light emitting device. And/or the pixel driving circuit comprises a driving transistor, the driving transistor is used for generating driving current to drive the light-emitting device to emit light, and the initialization circuit is used for initializing the control electrode of the driving transistor.
In some embodiments, the initialization circuit includes a first reset transistor and/or a second reset transistor. A first electrode of the first reset transistor is electrically connected to the first reference voltage signal line, a second electrode of the first reset transistor is electrically connected to the first electrode of the light emitting device, and a control electrode of the first reset transistor is electrically connected to the first scan signal line. A first pole of the second reset transistor is electrically connected with the second reference voltage signal line, and a second pole of the second reset transistor is electrically connected with the control electrode of the driving transistor; the control electrode of the second reset transistor is electrically connected with the second scanning signal line. Alternatively, the first reference voltage signal line and the second reference voltage signal line may be the same signal line (as shown in fig. 6) or different signal lines.
The design regarding the pixel driving circuit is not limited to the above design, and in at least one embodiment, the pixel driving circuit may further include a data writing transistor and a storage capacitor. In at least one embodiment, the pixel driving circuit may further include one or more of a compensation transistor, a first light emission control transistor, and a second light emission control transistor. The transistor can be a PMOS tube or an NMOS tube and can be arranged according to the requirement. The present application takes the transistor as a PMOS transistor as an example.
Illustratively, taking the case where adjacent red light emitting devices 7a share one initialization circuit, as shown in fig. 5 and 6, the pixel driving circuit 9a driving the red light emitting device 7c on the left side in fig. 5 is equivalent to the pixel driving circuit 9a in fig. 6, the pixel driving circuit 9a in fig. 6 may include a data writing transistor T1, a driving transistor T2, a compensation transistor T3, a first light emission controlling transistor T5 and a second light emission controlling transistor T6, the pixel driving circuit 9a driving the two red light emitting devices 7c shares the initialization circuit 10, and the shared initialization circuit 10 may include a first reset transistor T7 and/or a second reset transistor T4. Therefore, the design of the device with respect to the initialization circuit can be eliminated in the pixel drive circuit 9a' of the other red light emitting device in fig. 6, that is, only the pixel driving circuit 9a driving the red light emitting device 7c on the right side in fig. 5 is provided, the pixel driving circuit 9a driving the red light emitting device 7c on the right side in fig. 5 is equivalent to the pixel driving circuit 9a ' in fig. 6, the pixel driving circuit 9a ' includes a data writing transistor T '1, a driving transistor T '2, a compensating transistor T '3, a first light emission controlling transistor T '5 and a second light emission controlling transistor T '6, the pixel drive circuit 9a and the pixel drive circuit 9a' in figure 6 share the initialization circuit 11, therefore, the circuit layout is simplified, and the total area of the non-transparent portion of the second display region is reduced, thereby improving the transmittance of the second display region.
Specifically, the common initialization circuit includes a first reset transistor T7 and/or a second reset transistor T4. The first reset transistor T7 is connected to a first electrode, e.g., an anode, of the light emitting device and is configured to reset the first electrode of the light emitting device. The second reset transistor T4 is connected to the gate of the driving transistor T2 and is configured to reset the gate of the driving transistor T2. The reference voltage signal line is connected to the gate of the driving transistor T2 through the second reset transistor T4. The reference voltage signal line is connected to the first electrode of the light emitting device through the first reset transistor T7.
In the initialization stage, the emission control signal EM on the emission control line is at a high level, the second reset transistor T4 is turned on in response to a low level of the signal SCAN1 of the second SCAN signal line, and the initialization signal on the reference voltage signal line is written into the gates of the second transistors (driving transistors) T2 and T '2, respectively, ensuring that the subsequent data signal second transistors (driving transistors) T2 and T'2 are in a turned-on state at the initial timing of the next stage. At the same time, the first reset transistor T7 is turned on to write the initialization signals Vref on the reference voltage signal lines, respectively, to the first electrodes, e.g., anodes, of the two light emitting devices, respectively.
In the data writing phase, the signal EM on the emission control signal line is at a high level, the signal SCAN1 on the second SCAN signal line is at a high level, and the signal SCAN2 on the first SCAN signal line is at a low level. The first transistors (data writing transistors) T1 and T '1 and the third transistors (compensation transistors) T3 and T '3 turn on in response to a low level, writing the data signal Vdata on the data line to the gates of the second transistors (driving transistors) T2 and T '2, respectively.
In the light emission phase, the light emission control signal EM on the light emission control signal line is at a low level, the signal SCAN1 on the second SCAN signal line is at a high level, and the signal SCAN2 on the first SCAN signal line is at a high level. The sixth transistors T6 and T '6 and the fifth transistors T5 and T '5 are turned on in response to a low level of the emission control signal EM, and the second transistors (driving transistors) T2 and T '2 generate driving currents in response to voltages of their gates, respectively charging first electrodes, e.g., anodes, of the two light emitting devices. Since the control electrodes of the second transistor (driving transistor) T2 and T'2 are electrically connected and/or the anodes of the two light emitting devices are electrically connected, if the colors of the emitted light from the light emitting devices are the same, i.e., the data voltages of the two light emitting devices can be the same, the two light emitting devices normally emit light. If the colors of the light emitted by the light emitting devices sharing the initialization circuit are different, the light emitting devices emitting light of different colors will have the problem of color confusion due to different received data voltages.
Fig. 6 is a circuit design in which an initialization circuit is shared by different light emitting devices, and the structures and timings of the pixel driving circuit and the initialization circuit are not limited thereto, and other devices may be provided, and the number of capacitors in the pixel driving circuit, the number and types of transistors are not limited to those shown in the drawings, and these can be designed according to actual needs.
In some embodiments, the driving circuit layer further includes a plurality of signal lines electrically connected to at least one of the initialization circuit and the pixel driving circuit, at least one of the signal lines being formed by connecting a non-transparent trace and a transparent trace including a connection with each other, the non-transparent trace being located within an orthographic projection of the light emitting device on the substrate. Thus, the transmittance of the second display area is greatly improved. Optionally, the transparent trace is located outside an orthographic projection of the light emitting device on the substrate.
Exemplarily, as shown in fig. 4 and fig. 5, a portion of one signal line in the driving circuit layer 4, which is located in the gap between the light emitting devices 7a, 7b, and 7c, is a transparent trace 13, that is, is used for connecting the initialization circuit and the pixel driving circuit, a portion of the signal line, which is shielded by the anodes 8a, 8b, and 8c of the corresponding light emitting devices, is a non-transparent trace 12, and a portion of the signal line, which is not shielded by the anodes 8a, 8b, and 8c of the corresponding light emitting devices, is a transparent trace 13, so that the transmittance of the second display area is improved. Regarding the design of the signal lines, three cases are given below for detailed explanation.
In the first case, exemplarily, as shown in fig. 7, the display substrate includes light emitting devices of three colors of red, green and blue, the display substrate includes a plurality of pixel units, and each pixel unit includes a red light emitting device 7a, a green light emitting device 7b and a blue light emitting device 7c, and only in each pixel unit, a plurality of signal lines connecting the initialization circuit and the pixel driving circuit under the red light emitting device 7a, the green light emitting device 7b and the blue light emitting device 7c are configured as transparent traces 13, that is, traces between different pixel units are configured as non-transparent traces 12.
In the second case, as shown in fig. 8, only a plurality of signal lines between two adjacent pixel units are configured as transparent wirings 13, while wirings between the light emitting devices 7a, 7b, 7c within each pixel unit are configured as non-transparent wirings 12.
In the third case, as shown in fig. 9, the plurality of signal lines connected between the light emitting devices 7a, 7b, and 7c of different colors in each pixel unit are all transparent traces 13, that is, the plurality of signal lines connecting the initialization circuit and the pixel driving circuit under the red light emitting device 7a, the green light emitting device 7b, and the blue light emitting device 7c are configured as the transparent traces 13, and the plurality of signal lines connected between each pixel unit are also all transparent traces 13.
According to the design requirement of the display substrate, the above conditions can be combined, and the scheme that a plurality of signal lines of the initialization circuit and the pixel driving circuit which are connected below the light-emitting devices 7a, 7b and 7c with different colors are set as transparent wires increases the transmittance of the display substrate, improves the display effect of the display substrate and improves the experience of users.
In order to improve the production efficiency, the relationship between the transparent wires and the non-transparent wires is designed, in some embodiments, as shown in fig. 10 and 11, two ends of the transparent wires are respectively in direct contact with different non-transparent wires, and holes do not need to be punched, so that the production process of the display substrate is simplified, and the production cost is saved.
In other embodiments, the resistivity of the non-transparent traces is less than the resistivity of the transparent traces. In the conductive materials that are available in the current display field, the non-transparent conductive material has a wider available range and generally has higher conductivity, so that only a portion of the signal line is disposed as a transparent trace, and the non-transparent portion thereof is disposed in the area below the light emitting device, which can reduce the light blocking effect (including causing optical diffraction) of the signal line, and at the same time, the signal line can maintain relatively low resistance to reduce the voltage drop generated on the signal line.
It is to be understood that the plurality of signal lines include a gate line, a data line, a light emission control signal line, a power signal line, a reference voltage signal line, and the like.
Illustratively, as shown in fig. 10 and 11, the display substrate includes a substrate 1, a driving circuit layer 4 and a light emitting device layer 5, the driving circuit layer 4 is located between the substrate 1 and the light emitting device layer, and a plurality of signal lines for adjusting light emission of the display substrate are distributed on the driving circuit layer, at least one of the signal lines is formed by connecting a non-transparent trace 12 and a transparent trace 13.
In some embodiments, the plurality of light emitting devices in the second display region include a plurality of light emitting devices emitting light of the same color, the light emitting devices emitting light of the same color are divided into a plurality of groups, the light emitting devices emitting light of the same color in each group are located at similar positions, and the plurality of pixel driving circuits driving the light emitting devices emitting light of the same color share one initialization circuit. Further, the number of the light emitting devices with the same emergent light color in each group is the same.
Illustratively, as shown in fig. 4, three red light emitting devices 7a arranged in the column direction are set as one group, and as shown in fig. 5, two red light emitting devices in two adjacent pixel units are set as one group, and one initialization circuit is shared by the red pixel driving circuits in each group. Therefore, the pixel driving circuits of the light-emitting devices with the same emergent light color in one group are limited to share one initialization circuit, so that the phenomenon that the load of the initialization circuit is too large can be avoided, and the display efficiency of the second display area is improved. The further design scheme is favorable for the load uniformity of the shared initialization circuit and improves the display effect of the display substrate.
In some embodiments, the initialization circuit and the pixel driving circuit include at least one thin film transistor, the non-transparent trace of the at least one signal line is in the same layer and material as the gate electrode in the thin film transistor, and/or the non-transparent trace of the at least one signal line is in the same layer and material as the source electrode and the drain electrode in the thin film transistor. The connection between the traces and the tfts can be specifically designed according to the basic functional requirements of the display, and three schemes are described in detail below.
In a first scheme, as shown in fig. 4, the display substrate includes a substrate 1, a light emitting device layer 5 and a driving circuit layer 4, where the driving circuit layer 4 is located between the substrate 1 and the light emitting device layer 5, and includes an active film layer and a gate metal layer, and is used to form a pixel driving circuit 9a of a red light emitting device in the display substrate. The first common initialization circuit 10 and the red pixel driving circuit 9a include a plurality of thin film transistors, and active layers of the plurality of thin film transistors are located on an active film layer.
The gate metal layer comprises a plurality of signal lines, a part of an orthographic projection of one signal line on the substrate 1 and an orthographic projection of an active layer of a certain thin film transistor on the substrate are overlapped can be used as a gate electrode 2 of the thin film transistor, and an orthographic projection part of at least one signal line in the plurality of signal lines, extending out of the active layer of the certain thin film transistor, on the substrate 1 is a transparent wiring 13. The transparent trace 13 is in the same layer as the gate electrode 2 of a certain thin film transistor. The transparent trace 13 is not blocked by the anode 8a of its corresponding red light emitting device. The at least one signal line further includes a non-transparent trace 12 shielded by the anode 8a of the corresponding light emitting device. The non-transparent trace 12 is the same layer and material as the gate electrode 2 of a thin film transistor.
In a second scheme, as shown in fig. 5, the display substrate includes a substrate 1, a light emitting device layer 5 and a driving circuit layer 4, the driving circuit layer 4 is located between the substrate 1 and the light emitting device layer 5, and the driving circuit layer may include an active film layer and a gate metal layer for forming a plurality of pixel driving circuits 9a, 9b, 9c in the display substrate. The second common initialization circuit 11 and the plurality of pixel driving circuits 9a, 9b, 9c include a plurality of thin film transistors, and active layers of the plurality of thin film transistors are located on an active film layer.
The driving circuit layer further comprises a source-drain metal layer 3, a source electrode and a drain electrode of a certain thin film transistor are formed on the source-drain metal layer, the orthographic projection part of at least one signal line extending out of the active layer of the certain thin film transistor on the substrate 1 is a transparent wiring 13, namely the part of the at least one signal line, which is not shielded by the anode 8a, 8b and 8c of the corresponding light-emitting device, is the transparent wiring 13. The transparent trace 13 is in the same layer as the source electrode and the drain electrode 3 of a corresponding thin film transistor. The part of at least one signal line which is shielded by the anode 8a, 8b, 8c of the corresponding light emitting device is a non-transparent trace 12. The non-transparent trace 12 is the same layer and material as the source electrode and the drain electrode 3 of a corresponding thin film transistor.
In a third scheme, as shown in fig. 12, orthographic projection portions of at least two signal lines of the plurality of signal lines extending out of an active layer of a certain thin film transistor on the substrate 1 are transparent traces 13, the transparent trace 13 of at least one signal line is in the same layer as the gate electrode 2 of the certain thin film transistor, at least another transparent trace 13 is in the same layer as the source electrode and the drain electrode 3 of the corresponding certain thin film transistor, and the at least two signal lines further include non-transparent traces 12 which are not shielded by the anodes 8a, 8b, and 8c of the corresponding light emitting devices.
In some embodiments, when a transistor is manufactured, an active film layer may be formed on a substrate to obtain an active layer of the transistor, and then a gate metal layer is formed on a side of the active film layer away from the substrate, where a position where the gate metal layer overlaps with the active film layer is a gate electrode, for example, the gate electrode of the transistor overlaps with a channel region of the transistor. The active layer of each transistor comprises a first electrode region, a second electrode region and a channel region for connecting the first electrode region and the second electrode region, and the gate electrodes of the plurality of transistors are located on the gate metal layer. And forming a transparent conductive film on the side far away from the substrate, wherein the transparent conductive film can be used for forming transparent wiring after the patterning process.
In some embodiments, the pixel driving circuit further includes a storage capacitor, and the non-transparent trace of the at least one signal line is in the same layer as one electrode of the storage capacitor and is made of the same material as the electrode.
It should be understood that the transparent trace of the signal line is not limited to the arrangement manner of the same layer and the same material in the above embodiments, and may also be different from the gate electrode, the source/drain electrode, or the storage capacitor in the same layer, and the preparation material is different, which may be designed according to the actual production requirement.
It should be understood that the substrate of the display substrate in this embodiment may be a single-layer structure or a multi-layer structure, for example, a structure including a first flexible film (which may include polyimide or the like, for example), a first barrier layer, a second flexible film, and a second barrier layer, which are provided at one time, and a buffer layer may be provided on a side of the second barrier layer away from the second flexible film, and the buffer layer may block water and gas, while preventing impurity ions in the first flexible film and the second flexible film from contaminating the light-emitting device region.
In order to further improve the display effect of the second display region, not only the transmittance of the second display region is improved, but also the diffraction effect of the second display region is improved, as shown in fig. 13 and 14, a plurality of light emitting devices 103 are arranged in an array, optionally, the plurality of light emitting devices are arranged in an array of multiple rows and multiple columns, optionally, in each row of light emitting devices, the extending direction of at least a part of the light emitting devices forms an included angle α with the row direction X, and α is not less than 5 ° and not more than 45 °, optionally, in each column of light emitting devices, the extending direction of at least a part of the light emitting devices forms an included angle β with the column direction Y, and β is not less than 5 ° and not more than 45 °. Optionally, the row direction X and the column direction Y are respectively parallel to the substrate and perpendicular to each other, and optionally, the length of the light emitting device in the extending direction is greater than the length of the light emitting device in other directions. Alternatively, any two adjacent light emitting devices in each row of light emitting devices may be in a figure of eight. Alternatively, any two adjacent light emitting devices in each column of light emitting devices may be in a figure of eight. Thus, the included angle between each row of light emitting devices 103 and each column of light emitting devices 103 and the substrate is set according to the routing between the light emitting devices 103 or other requirements of the second display area of the display substrate, so that the diffraction effect of light can be improved, and the visual effect of the second display area is further improved.
In some embodiments, the display substrate further includes a passivation layer and a planarization layer sequentially disposed on a side of the source-drain metal layer away from the substrate, the anode is disposed on a side of the planarization layer away from the substrate, and a pixel defining layer is disposed on a side of the anode away from the substrate, wherein the pixel defining layer covers the anode and has a pixel opening exposing the anode, and an area of the pixel opening is the same on different light emitting device regions of the first display region and the second display region of the display substrate, the light emitting layer is disposed in the pixel opening, and the anode is electrically connected to the source-drain metal layer through a via hole and configured with an anode pattern, and the pixel opening exposes at least a portion of the anode pattern. Further, the anode pattern includes, but is not limited to, a circle, an ellipse, or a polygon, which reduces the diffraction effect of the display substrate, thereby improving the display effect thereof and improving the user experience.
The application further provides a display panel in some embodiments. The display panel includes any one of the display substrates provided above.
Some embodiments of the present application further provide a display device, which includes the display panel described above. The display device may be any product or component having a display function, such as a mobile phone, a tablet computer, a Personal Digital Assistant (PDA), an in-vehicle computer, a wearable display device, a liquid crystal television, a liquid crystal display, a Digital photo frame, and the like, wherein the display device further includes a flexible circuit board, a printed circuit board, and a back panel. The display device has all the advantages of the display substrate provided by any one of the above embodiments, and details are not described herein.
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.
In some embodiments, in the process of manufacturing the film layer of the display substrate, a Physical Vapor Deposition (PVD) method, such as sputtering, Chemical Vapor Deposition (CVD), or the like, is used to coat the film. And then coating the photoresist on the film layer in the exposure process, covering a mask on the surface of the film layer coated with the photoresist, and selectively irradiating by ultraviolet light based on a 9mask or 12mask process to ensure that the photoresist at the irradiated part is subjected to chemical reaction. In the developing process, the photoresist of the photosensitive part (or the non-photosensitive part) is removed, and the remaining photoresist film shows the required shape. Finally, in the photoetching process, the film layer which is not covered by the photoresist is etched away by using proper etching solution, so that the required film layer pattern is obtained. The above process may also be referred to as a Photolithography and Etching Process (PEP).
Specifically, as shown in fig. 15, in some embodiments, the specific processes for preparing the display substrate based on the 9mask process sequentially include:
PEP 1: the active layer, which may be, for example, the polysilicon layer PSI, is formed on the substrate by a single patterning process.
PEP 2: the first metal layer M1 is formed by a single patterning process and may include a gate electrode, for example.
PEP 3: the second metal layer M2 is formed by a single patterning process and may include, for example, a functional signal line and a capacitor.
PEP 4: the first interlayer dielectric ILD1 is formed by a single patterning process.
PEP 5: the third metal layer M3 is formed by a single patterning process and may include a drain electrode, a source electrode, and a data signal line.
PEP 6: a pattern including the planarization layer PLN1 was formed by a single patterning process.
PEP 7: the Anode is connected with the drain electrode through a via hole.
PEP 8: the pixel defining layer PDL is formed by a one-time patterning process.
PEP 9: the support post layer SPC is formed through a one-time patterning process.
As shown in fig. 16, a transparent material patterning process may be added between the processes of PEP2 and PEP3 to form a first transparent material layer on the side of the interlayer insulating layer above the gate layer away from the substrate, and a transparent material patterning process may be added between the processes of PEP3 and PEP4 to form a second transparent material layer on the side of the interlayer insulating layer above the capacitor upper plate away from the substrate. Further, the first transparent material layer and the second transparent material layer are made of transparent materials, such as ITO.
As shown in fig. 17, a transparent material patterning process may be added between the processes of PEP5 and PEP6 to form a first layer of transparent material on the side of the planarization layer near the substrate, and a transparent material patterning process may be added between the processes of PEP6 and PEP7 to form a second layer of transparent material on the side of the planarization layer far from the substrate. Further, the first transparent material layer and the second transparent material layer are made of transparent materials, such as ITO.
It should be understood that the above description is only given by way of example, the preparation of the display substrate of the present application is not limited to the above description, and a transparent material patterning process may be added between any two processes in the process of manufacturing the display substrate based on the 9mask process to form the transparent traces between the light emitting device regions, which may be designed according to actual requirements.
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 light emitting device layer on the substrate, the light emitting device layer including a plurality of light emitting devices; and
a driving circuit layer between the substrate and the light emitting device layer, the driving circuit layer including a plurality of initialization circuits and a plurality of pixel driving circuits for driving the plurality of light emitting devices, respectively;
wherein the pixel driving circuits of at least two of the light emitting devices that drive the same emission color share one of the initialization circuits.
2. The display substrate according to claim 1, wherein the plurality of light-emitting devices include at least two light-emitting devices different in emission color, the light-emitting device layer includes a plurality of pixel units each including a plurality of light-emitting devices different in emission color, and light-emitting devices driven by the pixel driving circuits which share the same initialization circuit are located in adjacent pixel units;
preferably, a light emitting device with a color different from that of the light emitting device driven by at least two pixel driving circuits sharing the same initialization circuit is arranged between the light emitting devices;
preferably, at least two of the pixel driving circuits sharing the same initialization circuit are disposed adjacently.
3. The display substrate according to claim 1 or 2, wherein the display substrate comprises a first display region and a second display region, the first display region has a light transmittance smaller than that of the second display region,
at least two pixel driving circuits sharing the initialization circuit are located in the second display area, or at least two pixel driving circuits sharing the initialization circuit are located in the first display area and the second display area.
4. A display substrate according to claim 3, wherein the common initialization circuit is provided in the first display region and/or the second display region.
5. The display substrate according to claim 4, wherein the light emitting device includes an anode, a light emitting layer, and a cathode stacked on the driving circuit layer, and in the second display region, at least a part of an orthogonal projection of the common initialization circuit on the substrate is located within an orthogonal projection of the anode on the substrate,
preferably, in the second display region, the orthographic projection of the pixel driving circuit on the substrate is located within the orthographic projection of the anode on the substrate;
preferably, orthographic projections of at least two adjacently arranged pixel driving circuits sharing the same initialization circuit on the substrate are respectively located in orthographic projections of the anodes of the light emitting devices with different light emitting colors and adjacent positions on the substrate;
preferably, an orthogonal projection of at least one of the at least two pixel driving circuits sharing the same initialization circuit on the substrate is located within an orthogonal projection of the anode of the light emitting device driven by the pixel driving circuit on the substrate.
6. The display substrate according to claim 1, wherein the initialization circuit is configured to initialize the light emitting device; and/or the presence of a gas in the gas,
the pixel driving circuit comprises a driving transistor, a driving circuit and a control circuit, wherein the driving transistor is used for generating driving current to drive the light-emitting device to emit light; the initialization circuit is used for initializing the control electrode of the driving transistor.
7. The display substrate according to claim 6, wherein the initialization circuit comprises a first reset transistor and/or a second reset transistor, a first electrode of the first reset transistor is electrically connected to a first reference voltage signal line, a second electrode of the first reset transistor is electrically connected to a first electrode of the light emitting device, and a control electrode of the first reset transistor is electrically connected to a first scanning signal line; a first pole of the second reset transistor is electrically connected with a second reference voltage signal line, and a second pole of the second reset transistor is electrically connected with the control electrode of the driving transistor; and the control electrode of the second reset transistor is electrically connected with the second scanning signal line.
8. The display substrate of claim 1, wherein the driving circuit layer further comprises:
a plurality of signal lines electrically connected to at least one of the initialization circuit and the pixel driving circuit,
at least one of the signal lines includes a non-transparent trace and a transparent trace connected to each other, the non-transparent trace being located within an orthographic projection of the light emitting device on the substrate,
preferably, two ends of the transparent trace are respectively in direct contact with different non-transparent traces.
9. The display substrate of claim 1,
the plurality of light emitting devices are arranged in an array of a plurality of rows and a plurality of columns, in each row of light emitting devices, the extending direction of at least part of the light emitting devices forms an included angle alpha with the row direction, and the alpha is more than or equal to 5 degrees and less than or equal to 45 degrees; in each column of the light-emitting devices, the extending direction of at least part of the light-emitting devices forms an included angle beta with the column direction, the included angle beta is more than or equal to 5 degrees and less than or equal to 45 degrees, the length of the light-emitting devices in the extending direction is more than that of the light-emitting devices in other directions,
preferably, adjacent light emitting devices in each row of light emitting devices are splayed, and/or adjacent light emitting devices in each column of light emitting devices are splayed.
10. A display device comprising the display substrate according to any one of claims 1 to 9.
CN202210759789.3A 2022-06-30 2022-06-30 Display substrate and display device Pending CN114914286A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024065425A1 (en) * 2022-09-29 2024-04-04 京东方科技集团股份有限公司 Display substrate and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024065425A1 (en) * 2022-09-29 2024-04-04 京东方科技集团股份有限公司 Display substrate and display device

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