CN110767739A

CN110767739A - Display substrate and display device

Info

Publication number: CN110767739A
Application number: CN201911190850.1A
Authority: CN
Inventors: 魏玉龙
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-02-07

Abstract

A display substrate includes a substrate, a driving circuit, a light emitting element, and a metal light shielding layer. The driving circuit is positioned on the substrate, the metal shading layer is positioned on one side of the driving circuit, which is far away from the substrate, and the light-emitting element is positioned on one side of the metal shading layer, which is far away from the driving circuit; the metal shading layer comprises a first metal shading part and a second metal shading part at least partially surrounding the first metal shading part, and the first metal shading part and the second metal shading part are insulated from each other and have light transmission areas; the driving circuit comprises a first electrode, and the first electrode is electrically connected with the first metal shading part through a first through hole; the light-emitting element comprises a second electrode which is electrically connected with the first metal shading part through a second through hole; an orthographic projection of the second electrode on the substrate base plate and an orthographic projection of the light-transmitting area on the substrate base plate are at least partially overlapped.

Description

Display substrate and display device

Technical Field

The embodiment of the disclosure relates to a display substrate and a display device.

Background

With the increasing popularization of mobile terminals, more and more users use the mobile terminals to perform operations such as identity authentication and electronic payment. Due to the uniqueness of fingerprint patterns, fingerprint identification technology combined with optical imaging is increasingly being adopted by mobile electronic devices for authentication, electronic payments, etc. Meanwhile, with the coming of the full screen era of mobile phones, the technology of fingerprint identification under the screen is more and more widely applied to the fingerprint identification of the mobile phones.

Disclosure of Invention

At least one embodiment of the present disclosure provides a display substrate including: a substrate, a driving circuit, a light emitting element and a metal light shielding layer; the driving circuit is positioned on the substrate, the metal shading layer is positioned on one side of the driving circuit, which is far away from the substrate, and the light-emitting element is positioned on one side of the metal shading layer, which is far away from the driving circuit; the metal light shielding layer comprises a first metal light shielding part and a second metal light shielding part at least partially surrounding the first metal light shielding part, and the first metal light shielding part and the second metal light shielding part are insulated from each other and provided with light transmission areas; the driving circuit comprises a first electrode, and the first electrode is electrically connected with the first metal shading part through a first through hole; the light-emitting element comprises a second electrode which is electrically connected with the first metal shading part through a second through hole; an orthographic projection of the second electrode on the substrate base plate and an orthographic projection of the light-transmitting area on the substrate base plate are at least partially overlapped.

For example, in a display substrate provided in at least one embodiment of the present disclosure, an orthogonal projection of the light-transmitting region on the substrate is located within an orthogonal projection of the second electrode on the substrate.

For example, in a display substrate provided in at least one embodiment of the present disclosure, an area of an orthogonal projection of the second electrode on the substrate is larger than an area of an orthogonal projection of the light-transmitting region on the substrate.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the driving circuit includes a first light-transmitting opening configured to allow light incident from a display side of the display substrate to pass therethrough.

For example, in a display substrate provided in at least one embodiment of the present disclosure, an orthographic projection of the first light-transmitting opening on the substrate partially overlaps with an orthographic projection of the light-transmitting region on the substrate.

For example, in a display substrate provided in at least one embodiment of the present disclosure, an orthogonal projection of the second electrode on the substrate at least partially covers other portions of the orthogonal projection of the first light-transmitting opening on the substrate except for a portion overlapping with an orthogonal projection of the light-transmitting region on the substrate.

For example, in a display substrate provided in at least one embodiment of the present disclosure, an orthogonal projection of the first light-transmitting opening on the substrate is located within an orthogonal projection of the light-transmitting region on the substrate.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the second electrode includes a second light-transmitting opening configured to allow light incident from a display side of the display substrate to pass through and further pass through the light-transmitting region and the first light-transmitting opening.

For example, in the display substrate provided in at least one embodiment of the present disclosure, an orthogonal projection of the second light-transmitting opening on the substrate is located within an orthogonal projection of the first light-transmitting opening on the substrate, and an area of the orthogonal projection of the second light-transmitting opening on the substrate is equal to an area of the orthogonal projection of the first light-transmitting opening on the substrate.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the driving circuit further includes a first transistor, and the first electrode is configured as a source or a drain of the first transistor.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the driving circuit further includes a first transistor, the first transistor is located on a side of the first electrode away from the metal light shielding layer, and a source or a drain of the first transistor is electrically connected to the first electrode.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the first via hole and the second via hole are at least partially overlapped in a direction perpendicular to the substrate, or the first via hole and the second via hole are staggered in a direction perpendicular to the substrate.

For example, in a display substrate provided in at least one embodiment of the present disclosure, an orthogonal projection of the first via on the substrate and an orthogonal projection of the second via on the substrate at least partially overlap, or an orthogonal projection of the first via on the substrate and an orthogonal projection of the second via on the substrate do not overlap with each other.

For example, the display substrate provided by at least one embodiment of the present disclosure further includes a first insulating layer and a second insulating layer, where the first insulating layer is located between the first electrode and the metal light shielding layer, the second insulating layer is located between the second electrode and the metal light shielding layer, the first via hole is disposed in the first insulating layer, and the second via hole is disposed in the second insulating layer.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the second electrode is an opaque electrode.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the first metal light shielding part and the second metal light shielding part are configured to receive different electrical signals, respectively.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the light emitting element further includes a pixel defining layer, a light emitting layer, and a third electrode, the pixel defining layer is located on a side of the second electrode away from the metal light shielding layer, the light emitting layer is located on a side of the pixel defining layer away from the second electrode, and the third electrode is located on a side of the light emitting layer away from the pixel defining layer.

For example, at least one embodiment of the present disclosure provides a display substrate further including a photosensitive element, where the photosensitive element is located on a side of the driving circuit away from the metal light shielding layer and configured to receive light incident from a display side of the display substrate and passing through the first light-transmitting opening.

For example, in a display substrate provided in at least one embodiment of the present disclosure, an orthogonal projection of the first light-transmitting opening on the substrate is located within an orthogonal projection of the light-sensing element on the substrate.

At least one embodiment of the present disclosure further provides a display device including the display substrate according to any one of the embodiments of the present disclosure.

At least one embodiment of the present disclosure further provides a method for manufacturing a display substrate, including: providing a substrate base plate; forming a first electrode of a driving circuit on the substrate; forming a metal light shielding layer on the first electrode; and forming a second electrode of a light emitting element on the metallic light shielding layer; wherein the metal light shielding layer comprises a first metal light shielding part and a second metal light shielding part at least partially surrounding the first metal light shielding part, and the first metal light shielding part and the second metal light shielding part are insulated from each other and have light transmission regions; the first electrode is electrically connected with the first metal shading part through a first through hole, and the second electrode is electrically connected with the first metal shading part through a second through hole; an orthographic projection of the second electrode on the substrate base plate and an orthographic projection of the light-transmitting area on the substrate base plate are at least partially overlapped.

For example, the method for manufacturing a display substrate according to at least one embodiment of the present disclosure further includes: forming a first insulating layer between the first electrode and the metallic shading layer, and forming the first via hole in the first insulating layer; and forming a second insulating layer between the second electrode and the metal shading layer, and forming the second via hole in the second insulating layer.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1 is a schematic plan view of a display substrate according to some embodiments of the present disclosure;

fig. 2 is a schematic diagram of a pixel circuit structure of a display substrate according to some embodiments of the present disclosure;

fig. 3 is a schematic partial top view of a display substrate according to some embodiments of the present disclosure;

4A-4B are schematic partial top views of another display substrate provided in some embodiments of the present disclosure;

fig. 5A is a schematic view of a partial cross-sectional structure of a display substrate according to some embodiments of the present disclosure;

fig. 5B is a schematic view of a partial cross-sectional structure of another display substrate according to some embodiments of the present disclosure;

FIG. 6 is a schematic top view of a portion of another display substrate according to some embodiments of the present disclosure; and

fig. 7 is a partial top view schematic diagram of another display substrate according to some embodiments of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

Currently, one way to realize the identification of the fingerprint under the screen is to integrate a photosensitive element (e.g. a photosensitive image sensor) with the fingerprint identification function into a display device, and use the principle of pinhole imaging in combination with the photosensitive element to acquire the fingerprint image. For example, small holes are formed in a display area of the display device at certain intervals to serve as imaging small holes, so that light reflected by a finger fingerprint can be irradiated onto the photosensitive element through the imaging small holes to be imaged, and the display device can analyze and process an acquired fingerprint image to realize a fingerprint identification function. However, in the process of acquiring a fingerprint image by the photosensitive element, stray light in a large viewing angle direction may be formed by light reflected by a fingerprint of a finger or light incident from the outside, and the stray light may pass through other places except an imaging aperture and irradiate the photosensitive element, which causes a light leakage phenomenon, and further interferes with an imaging result on the photosensitive element, which affects the definition of the acquired fingerprint image, so that the display device cannot accurately analyze and identify the fingerprint according to the acquired fingerprint image, and therefore the light leakage phenomenon in other places except the imaging aperture in the display device needs to be reduced or prevented.

At least one embodiment of the present disclosure provides a display substrate including a substrate, a driving circuit, a light emitting element, and a metal light shielding layer. The drive circuit is located on the substrate, the metal shading layer is located on one side, away from the substrate, of the drive circuit, and the light-emitting element is located on one side, away from the drive circuit, of the metal shading layer. The metal light shielding layer includes a first metal light shielding portion and a second metal light shielding portion at least partially surrounding the first metal light shielding portion, the first metal light shielding portion and the second metal light shielding portion being insulated from each other and having a light transmitting region. The driving circuit comprises a first electrode, and the first electrode is electrically connected with the first metal shading part through the first through hole. The light emitting element includes a second electrode electrically connected to the first metal light shielding portion through the second via hole. An orthographic projection of the second electrode on the substrate base plate and an orthographic projection of the light-transmitting area on the substrate base plate are at least partially overlapped.

The display substrate provided by the embodiment of the disclosure can reduce or filter stray light leaking from the display side of the display substrate by overlapping the second electrode and the light-transmitting area in the metal light shielding layer in the direction perpendicular to the substrate, and weaken or avoid the light leakage phenomenon, thereby weakening or avoiding adverse effects of the stray light on the photosensitive imaging process of the display substrate, and making the image obtained by the display substrate more clear and accurate.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that the same reference numerals in different figures will be used to refer to the same elements that have been described.

Fig. 1 is a schematic plan view of a display substrate 10 according to some embodiments of the present disclosure.

For example, as shown in fig. 1, the display substrate 10 includes a display area 101, and the display area 101 includes a fingerprint identification area 102. The fingerprint identification area 102 may be a partial area or a whole area of the display area 101, thereby enabling the display substrate 10 to implement a partial off-screen fingerprint identification function or a full-screen fingerprint identification function. For example, openings (e.g., small holes) may be opened in the fingerprint identification area 102 at a certain distance to serve as imaging small holes, so that light reflected by a fingerprint of a user is irradiated onto, for example, a photosensitive element of the display substrate 10 through the imaging small holes to perform imaging, and then the display substrate 10 may acquire a fingerprint image of the user and perform analysis processing on the acquired fingerprint image to realize a fingerprint identification function.

For example, in some embodiments of the present disclosure, the display substrate 10 may be an Organic Light Emitting Diode (OLED) display substrate, a quantum dot light emitting diode (QLED) display substrate, an electronic paper display substrate, or the like, which is not limited in this respect.

Since the OLED display substrate has a self-luminous property, the emission luminance of the pixel unit for displaying thereof may be controlled or adjusted as needed, and thus, for example, a fingerprint image capturing process may be facilitated, and it may also contribute to an increase in the integration of a display device including the OLED display substrate. The embodiment of the disclosure is described by taking the display substrate 10 as an OLED display substrate, but this is not to be construed as limiting the embodiment of the disclosure.

For example, in the case where the display substrate 10 is used for fingerprint recognition, light emitted from the organic light emitting diode is reflected by the skin (e.g., finger or palm) of a user on the display side of the display substrate 10, and is irradiated onto a photosensitive element, for example, on the back side of the display substrate 10 opposite to the display side, through openings opened at a certain interval by using the principle of pinhole imaging, to be imaged, so that the photosensitive element can acquire a skin texture image (e.g., fingerprint pattern) of the user. The display substrate 10 performs corresponding operations after analyzing and recognizing the texture image of the skin of the user acquired by the photosensitive element, for example, the display substrate 10 may perform corresponding operations according to a preset control flow after performing fingerprint recognition on the acquired fingerprint image.

For example, the photosensitive element may be built in the display substrate 10. For example, the photosensitive element may be disposed between the substrate of the display substrate 10 and the driving circuit, so that the photosensitive element may be closer to the display side of the display substrate 10, and a path of the reflected light irradiated onto the photosensitive element is shortened, so that the skin texture image acquired by the photosensitive element is more accurate and clearer.

For example, the light-sensitive element may be a light-sensitive image sensor, and a fingerprint or palm print image or other texture image of the skin of the user is formed by acquiring light reflected by the skin of the user, so that the display device including the display substrate 10 can realize functions of fingerprint identification, palm print identification and the like. For example, in some embodiments of the present disclosure, the photosensitive element may also be used to capture images of non-biological textures other than fingerprints and palm prints, such as finger prints, and the like, which are not limited by embodiments of the present disclosure.

For example, the light sensing element may be coupled (or signal connected) to a processor (e.g., an integrated circuit chip) via a lead, and the captured skin texture image is communicated to the processor of the display device as a data signal. For example, the light sensing element may also be a fingerprint sensor of various suitable types, such as a Charge Coupled Device (CCD) type or a Complementary Metal Oxide Semiconductor (CMOS) type image sensor, and the embodiments of the present disclosure are not limited thereto. For example, the light sensing element may sense only light of a certain wavelength (e.g., red or green light) or may sense all visible light, as desired.

The embodiment of the present disclosure takes the example of collecting a fingerprint image by using a photosensitive element, and the structure, the function, and the like of the display substrate provided in some embodiments of the present disclosure are described, but this does not limit the embodiments of the present disclosure.

For example, the display region 101 of the display substrate 10 may be divided into a plurality of pixel units arranged in an array, and each pixel unit is provided therein with a light emitting element (e.g., OLED) and a driving circuit electrically connected to the light emitting element. For example, each pixel unit may drive the OLED to emit light through a driving circuit, and control the light emission luminance of the OLED as needed. For example, the driving circuit may be a 2T1C circuit based on, i.e., a circuit using two thin film transistors and a storage capacitor to implement the basic function of driving the OLED to emit light, or may also be a circuit with other structures, e.g., a circuit with 4T1C, 4T2C, 6T1C or 8T 2C. For example, the anode of the OLED may be electrically connected to a source or a drain of a driving transistor or a light emitting control transistor in a driving circuit, for example, to obtain an anode signal, and then, in cooperation with the cathode of the OLED, cause the light emitting layer of the OLED to emit light.

Next, a display substrate provided in some embodiments of the present disclosure is described by taking as an example a circuit structure in which a driver circuit includes 7T 1C. It should be noted that the embodiments of the present disclosure include but are not limited thereto.

Fig. 2 is a schematic diagram of a pixel circuit structure of a display substrate according to some embodiments of the present disclosure. For example, fig. 2 is a schematic diagram of a driving circuit structure of each pixel unit in the display region 101 of the display substrate 10 shown in fig. 1.

For example, as shown in fig. 2, each pixel unit includes a driving circuit 310, a light emitting element 320, and a gate line 113, a data line 213, and a voltage signal line.

For example, the light emitting elements 320 are Organic Light Emitting Diodes (OLEDs), and the light emitting elements 320 emit red light, green light, blue light, white light, or the like under the driving of their corresponding driving circuits 310.

For example, the voltage signal line may include one or more voltage signal lines.

For example, as shown in fig. 2, the voltage signal line includes at least one of the first power line 214, the second power line 14, the light emission control signal line 110, the first initialization signal line 212, the second initialization signal line 211, the first reset control signal line 111, the second reset control signal line 112, and the like. The gate line 113 is configured to supply a SCAN signal SCAN to the driving circuit 310. The DATA line 213 is configured to supply the DATA signal DATA to the driving circuit 310.

For example, one pixel includes a plurality of pixel units. One pixel may include a plurality of pixel units emitting light of different colors. For example, one pixel includes a pixel unit emitting red light, a pixel unit emitting green light, and a pixel unit emitting blue light, but is not limited thereto. The number of the pixel units included in one pixel and the light emitting condition of each pixel unit can be determined according to actual needs.

For example, the first power line 214 is configured to provide a constant first voltage signal ELVDD to the driving circuit 310, the second power line 14 is configured to provide a constant second voltage signal ELVSS to the driving circuit 310, and the first voltage signal ELVDD is greater than the second voltage signal ELVSS. The emission control signal line 110 is configured to supply the emission control signal EM to the driving circuit 310. The first and second

initialization signal lines

212 and 211 are configured to supply an initialization signal Vint to the driving circuit 310, the first RESET control signal line 111 is configured to supply a RESET control signal RESET to the driving circuit 310, and the second RESET control signal line 112 is configured to supply a SCAN signal SCAN to the driving circuit 310. The initialization signal Vint is a constant voltage signal, and may have a magnitude between the first voltage signal ELVDD and the second voltage signal ELVSS, for example, but is not limited thereto, and may be less than or equal to the second voltage signal ELVSS.

For example, as shown in fig. 2, the driving circuit 310 includes a driving transistor T1, a data writing transistor T2, a threshold compensation transistor T3, a first light emission controlling transistor T4, a second light emission controlling transistor T5, a first reset transistor T6, a second reset transistor T7, and a storage capacitor C1. The driving transistor T1 is electrically connected to the light emitting element 320, and outputs a driving current under the control of signals such as a SCAN signal SCAN supplied from the gate line 113, a DATA signal DATA supplied from the DATA line 213, a first voltage signal ELVDD supplied from the first power line 214, and a second voltage signal ELVSS supplied from the second power line 14 to drive the light emitting element 320 to emit light.

For example, in a pixel unit of an OLED display substrate, a driving transistor is electrically connected to an organic light emitting element, and outputs a driving current to the organic light emitting element under the control of a data signal, a scan signal, or the like, thereby driving the organic light emitting element to emit light.

Fig. 3 is a partial top view schematic diagram of a display substrate according to some embodiments of the present disclosure. For example, fig. 3 is a partial schematic top view of the display substrate 10 shown in fig. 1.

For example, as shown in fig. 1, fig. 2 and fig. 3, the display substrate 10 includes a driving circuit 310, the driving circuit 310 includes a first light-transmitting opening 410, and the first light-transmitting opening 410 is located between the first light-emitting control transistor T4 and the second light-emitting control transistor T5.

The display substrate 10 provided in the embodiment of the disclosure obtains a more reasonable placement scheme of the first light-transmitting opening 410 (i.e., the imaging aperture) by integrally optimizing and adjusting the pattern (pattern) in the pixel unit under the condition of ensuring the process margin (margin) and the function of the driving circuit 310.

For example, as shown in fig. 2 and 3, the gate T40 of the first light emission controlling transistor T4 and the gate T50 of the second light emission controlling transistor T5 are both connected to the light emission control signal line 110. For example, as shown in fig. 3, a portion of the light emission control signal line 110 serves as the gate T40 of the first light emission control transistor T4. For example, as shown in fig. 3, a portion of the light emission control signal line 110 serves as the gate T50 of the second light emission control transistor T5. As shown in fig. 3, the light emission control signal line 110 extends in the first direction X. Since the first light transmission opening 410 is located between the first and second light emission controlling transistors T4 and T5, the position of the first light transmission opening 410 is defined in the first direction X.

For example, as shown in fig. 3, the first light emission controlling transistor T4, the first light transmitting opening 410, and the second light emission controlling transistor T5 are arranged in the first direction X. For example, the first pole T41 of the first light emission controlling transistor T4 and the second pole T52 of the second light emission controlling transistor T5 are located at the same side of the light emission control signal line 110, and a line connecting the center of the first pole T41 of the first light emission controlling transistor T4 and the center of the second pole T52 of the second light emission controlling transistor T5 passes through the first light transmission opening 410. It should be noted that, in the embodiments of the present disclosure, the center of a certain element may refer to the center of its geometric shape, or the center of a certain element may refer to the center of gravity of its geometric shape, but is not limited thereto. A line connecting the center of the first pole T41 of the first light emission controlling transistor T4 and the center of the second pole T52 of the second light emission controlling transistor T5 is a dummy line.

For example, as shown in fig. 3, the first light-transmitting opening 410 is located at a first side of the light emission control signal line 110. The first pole T41 of the first light emission controlling transistor T4 and the second pole T52 of the second light emission controlling transistor T5 are also located at the first side of the light emission control signal line 110.

For example, as shown in fig. 2 and 3, the driving circuit 310 further includes a driving transistor T1 located at a second side of the light emission control signal line 110, the first side and the second side being opposite sides of the light emission control signal line 110. For example, as shown in fig. 3, the first side is an upper side of the light emission control signal line 110, and the second side is a lower side of the light emission control signal line 110.

For example, the first and second poles T41 and T42 of the first light emitting control transistor T4 are electrically connected to the first power line 214 and the first pole T11 of the driving transistor T1, respectively. The first electrode T51 and the second electrode T52 of the second light-emitting control transistor T5 are electrically connected to the second electrode T12 of the driving transistor T1 and the second electrode 322 (not shown in fig. 3, please refer to fig. 2 or fig. 4B) of the light-emitting device 320, respectively. For example, the second electrode 322 may be an anode of the light emitting element 320.

For example, as shown in fig. 3, the first power line 214 extends in a second direction Y, which intersects the first direction X. For example, the second direction Y is perpendicular to the first direction X, but is not limited thereto.

For example, as shown in fig. 3, the gate T60 of the first reset transistor T6 is electrically connected to the first reset control signal line 111, the first pole T61 of the first reset transistor T6 is electrically connected to the second initialization signal line 211 through the first connection electrode 31a, and the second pole T62 of the first reset transistor T6 is electrically connected to the gate T10 of the driving transistor T1 through the second connection electrode 31 b. The gate T70 of the second reset transistor T7 is electrically connected to the second reset control signal line 112, the first pole T71 of the second reset transistor T7 is electrically connected to the first initialization signal line 212 through the third connection electrode 31c, and the second pole T72 of the second reset transistor T7 is electrically connected to the second electrode 322 (not shown in fig. 3, see fig. 2 or 4B) of the light emitting element 320.

For example, as shown in fig. 2 and 3, the gate T40 of the first light emission controlling transistor T4 is electrically connected to the light emission control signal line 110, and the first pole T41 and the second pole T42 of the first light emission controlling transistor T4 are electrically connected to the first power line 214 and the first pole T11 of the driving transistor T1, respectively. The gate T50 of the second light emission controlling transistor T5 is electrically connected to the light emission controlling signal line 110, and the first and second electrodes T51 and T52 of the second light emission controlling transistor T5 are electrically connected to the second electrode T12 of the driving transistor T1 and the second electrode 322 (see fig. 2) of the light emitting element 320, respectively. The third electrode 321 (which may be a common electrode of the OLED, e.g., a cathode) of the light emitting element 320 is electrically connected to the second power line 14 (see fig. 2).

It should be noted that the transistors used in the embodiments of the present disclosure may be thin film transistors or field effect transistors or other switching devices with the same characteristics. The source and drain of the transistor used herein may be symmetrical in structure, so that there may be no difference in structure between the source and drain. In the embodiments of the present disclosure, in order to distinguish two poles of a transistor except for a gate, one of them is directly described as a first pole, and the other is directly described as a second pole, so that the first pole and the second pole of all or part of the transistors in the embodiments of the present disclosure may be interchanged as necessary. For example, the first pole of the transistor according to the embodiment of the present disclosure may be a source, and the second pole may be a drain; alternatively, the first pole of the transistor is the drain and the second pole is the source.

Further, the transistors may be classified into N-type and P-type transistors according to their characteristics. The embodiments of the present disclosure are described by taking P-type transistors as examples of transistors. Based on the description and teaching of this implementation manner in the present disclosure, a person skilled in the art can easily think of an implementation manner in which at least some of the transistors in the pixel circuit structure of the embodiment of the present disclosure are N-type transistors, that is, N-type transistors or a combination of N-type transistors and P-type transistors, without making creative efforts, and therefore, these implementation manners are also within the protection scope of the present disclosure.

For example, as shown in fig. 3, the second initialization signal line 211 extends in the first direction X, the first initialization signal line 212 extends in the first direction X, the first reset control signal line 111 extends in the first direction X, and the second reset control signal line 112 extends in the first direction X.

For example, as shown in fig. 3, the first light-transmitting opening 410 is also located between the driving transistor T1 and the second reset transistor T7. Thus, in the second direction Y, the position of the first light-transmitting opening 410 is defined.

For example, the driving transistor T1 and the second reset transistor T7 are respectively disposed at both sides of the first light-transmitting opening 410 opposite to each other in the second direction Y. For example, the first light-transmitting opening 410 is provided with a driving transistor T1 and a second reset transistor T7 on both sides in the second direction Y, respectively.

For example, the first light-transmitting opening 410 is also located between the first initialization signal line 212 and the light emission control signal line 110, so that the position of the first light-transmitting opening 410 is defined in the second direction Y.

For example, as shown in fig. 3, the second reset control signal line 112, the first initialization signal line 212, the light emission control signal line 110, the first reset control signal line 111, and the second initialization signal line 211 are sequentially arranged in the second direction Y.

For example, as shown in fig. 2 and 3, the first pole C11 of the storage capacitor C1 is electrically connected to the first power line 214, and the second pole C12 of the storage capacitor C1 is electrically connected to the second pole T32 of the threshold compensation transistor T3 through the second connection electrode 31 b. The gate T20 of the data writing transistor T2 is electrically connected to the gate line 113, and the first electrode T21 and the second electrode T22 of the data writing transistor T2 are electrically connected to the data line 213 and the first electrode T11 of the driving transistor T1, respectively. The gate T30 of the threshold compensation transistor T3 is electrically connected to the gate line 113, the first pole T31 of the threshold compensation transistor T3 is electrically connected to the second pole T12 of the driving transistor T1, and the second pole T32 of the threshold compensation transistor T3 is electrically connected to the gate T10 of the driving transistor T1 through the second connection electrode 31 b.

For example, as shown in fig. 3, in order to facilitate the formation of the first light-transmitting opening 410, the edge of the first power line 214 near the data line 213 is equally distant from the data line 213 at various positions.

For example, as shown in fig. 3, the gate line 113 extends in the first direction X, and the gate line 113 is positioned between the light emission control signal line 110 and the first reset control signal line 111. For example, as shown in fig. 3, the gate line 113 is positioned between the storage capacitor C1 and the first reset control signal line 111.

For example, as shown in fig. 3, the data line 213 extends in the second direction Y, and the first power line 214 extends in the second direction Y.

For example, as shown in fig. 3, the first power line 214 is electrically connected to the first pole T41 of the first light emitting control transistor T4 through a via VH 2. For example, as shown in fig. 3, the second connection electrode 31b is connected to the second pole T32 of the threshold compensation transistor T3 through a via VH21, and the second connection electrode 31b is connected to the gate T10 of the driving transistor T1 through a via VH 22.

For example, as shown in fig. 3, the size of the first light-transmitting opening 410 in the first direction X is 5 μm to 15 μm, and the size of the first light-transmitting opening 410 in the second direction Y is 5 μm to 15 μm. For example, the size of the pixel cell in the first direction X is about 30 μm. For example, the size of the pixel unit in the second direction Y is about 60 μm.

For example, as shown in fig. 3, the display substrate 10 further includes a fourth connection electrode 31d, and the fourth connection electrode 31d is electrically connected to the second diode T52 of the second emission control transistor T5. The fourth connection electrode 31d can be used to electrically connect with a second electrode 322 (not shown in fig. 3, please refer to fig. 2 or fig. 4B) of a light emitting device 320 formed subsequently.

In the embodiment of the present disclosure, as shown in fig. 3, the gate T40 of the first light emission controlling transistor T4 is a part of the light emission controlling signal line 110, the gate T50 of the second light emission controlling transistor T5 is a part of the light emission controlling signal line 110, the gate T20 of the data writing transistor T2 is a part of the gate line 113, the gate T30 of the threshold compensating transistor T3 is a part of the gate line 113, the gate T60 of the first reset transistor T6 is a part of the first reset controlling signal line 111, and the gate T70 of the second reset transistor T7 is a part of the second reset controlling signal line 112.

For example, the octagonal wire frames in fig. 3 represent the positions corresponding to via VH40, via VH0, via VH1, via VH2, via VH3, via VH11, via VH12, via VH21, via VH22, via VH31, and via VH32, respectively. For example, as shown in fig. 3, the data line 213 is electrically connected to the first pole T21 of the data write transistor T2 through a via VH1, the first power line 214 is electrically connected to the first pole T41 of the first light emission control transistor T4 through a via VH2, the first power line 214 is electrically connected to the first pole C11 of the storage capacitor C1 through a via VH3, the first power line 214 is electrically connected to the connection element 215 through a via VH0, and the connection element 215 is connected in parallel to the first power line 214, thereby functioning to reduce resistance. One end of the first connection electrode 31a is electrically connected to the second initialization signal line 211 through the via VH11, and the other end of the first connection electrode 31a is connected to the first pole T61 of the first reset transistor T6 through the via VH12, so that the first pole T61 of the first reset transistor T6 is electrically connected to the second initialization signal line 211. One end of the second connection electrode 31b is electrically connected to the second pole T62 of the first reset transistor T6 through the via VH21, and the other end of the second connection electrode 31b is electrically connected to the gate T10 of the driving transistor T1 (i.e., the second pole C12 of the storage capacitor C1) through the via VH22, so that the second pole T62 of the first reset transistor T6 is electrically connected to the gate T10 of the driving transistor T1 (i.e., the second pole C12 of the storage capacitor C1). One end of the third connection electrode 31c is electrically connected to the first initialization signal line 212 through the via VH31, and the other end of the third connection electrode 31c is electrically connected to the first pole T71 of the second reset transistor T7 through the via VH32, so that the first pole T71 of the second reset transistor T7 is electrically connected to the first initialization signal line 212. The fourth connection electrode 31d is electrically connected to the second diode T52 of the second light emission controlling transistor T5 through the via VH 40.

For example, in fig. 3, the second reset transistor T7 at the upper left corner, the first reset transistor T6 at the lower right corner, the drive transistor T1, the data write transistor T2, the threshold compensation transistor T3, the first light emission control transistor T4, and the second light emission control transistor T5 constitute 7 transistors shown in fig. 2, that is, 7 transistors in the drive circuit in one pixel unit.

In some embodiments, the imaging apertures for performing the fingerprint recognition function are periodically distributed in the fingerprint recognition area 102 of the display substrate 10, for example, in the fingerprint recognition area 102 of the display substrate 10, the first light-transmitting openings 410 in the pixel units are arranged as imaging apertures at certain intervals to perform the fingerprint recognition operation. For the first light-transmitting opening 410 which is not used as an imaging aperture in the fingerprint identification area 102, the metal light-shielding layer disposed on the driving circuit 310 and the second electrode of the light-emitting element 320 disposed on the metal light-shielding layer are used for shielding, so that the leakage of stray light incident from the display side of the display substrate 10 through the first light-transmitting opening 410 which is not used as an imaging aperture is reduced or avoided, and the adverse effect of the stray light on the photosensitive imaging process of the display substrate 10 is reduced or avoided, so that the image acquired by the display substrate 10 is clearer and more accurate.

Fig. 4A-4B are schematic partial top views of another display substrate according to some embodiments of the present disclosure. For example, fig. 4A and 4B are partial top view schematic diagrams of a pixel unit corresponding to the display substrate 10 shown in fig. 1 without an imaging pinhole (i.e., the first light-transmitting opening 410 is not used as an imaging pinhole) in the fingerprint identification region 102.

It should be noted that, the partial top view structure of the display substrate 10 shown in fig. 4A is substantially the same as or similar to the partial top view structure of the display substrate 10 shown in fig. 3 except that a metal light shielding layer is added; the local top view structure of the display substrate 10 shown in fig. 4B is substantially the same as or similar to the local top view structure of the display substrate 10 shown in fig. 3 except that the metal light shielding layer and the second electrode 322 of the light emitting device 320 are added, and thus, the description thereof is omitted.

For example, as shown in fig. 4A and 4B, in a pixel unit where no imaging aperture is provided, the first light-transmitting opening 410 is overlapped and shielded by the metal light-shielding layer located on the substrate side of the driving circuit 310 away from the display substrate 10 and the second electrode 322 of the light-emitting element 320 located on the side of the metal light-shielding layer away from the driving circuit 310 to prevent stray light from leaking through the light-transmitting opening 410.

For example, as shown in fig. 4A and 4B, the first metal light shielding part 510 of the metal light shielding layer may be provided in an octagon shape, and in a direction perpendicular to the substrate of the display substrate 10, the first metal light shielding part 510 partially overlaps the first light transmission opening 410 to shield a portion of the first light transmission opening 410. The second metal light-shielding part 520 of the metal light-shielding layer surrounds the first metal light-shielding part 510, and the first metal light-shielding part 510 and the second metal light-shielding part 520 are insulated from each other and have a light-transmitting region 530. The second metal light-shielding part 520 partially overlaps the first light-transmitting opening 410 in a direction perpendicular to the substrate of the display substrate 10, thereby shielding part of the first light-transmitting opening 410. For example, the outer contour and the inner contour of the light-transmitting region 530 are both octagonal, i.e., the light-transmitting region 530 is a ring shape having an octagonal shape.

For example, as shown in fig. 4A and 4B, in the direction perpendicular to the substrate of the display substrate 10, the second electrode 322 of the light emitting element 320 partially overlaps the light transmitting region 530, and thus a portion of the first light transmitting opening 410 overlapping the light transmitting region 530 in the direction perpendicular to the substrate of the display substrate 10, that is, the portion of the first light transmitting opening 410 not shielded by the first metal light shielding portion 510 and the second metal light shielding portion 520, can be shielded, so that it is possible to prevent or reduce the leakage of the stray light incident from the display side of the display substrate 10 through the light transmitting region 530. Furthermore, the second electrode 522 of the light emitting element 520, by shielding the light transmitting region 530, can shield the whole region of the first light transmitting opening 410 with the first metal light shielding part 510 and the second metal light shielding part 520, so as to reduce or prevent the stray light incident from the display side of the display substrate 10 from leaking through the light transmitting region 530 or the first light transmitting opening 410 which is not used as an imaging aperture, reduce or prevent the stray light from having an adverse effect on the photosensitive imaging process of the display substrate 10, and make the image acquired by the display substrate 10 clearer and more accurate.

It should be noted that, in the embodiment shown in fig. 4A and 4B, the first metal light shielding part 510 is an octagon, and the outline of the light-transmitting region 530 may be an octagon accordingly; in some other embodiments of the present disclosure, the first metal light shielding part 510 may also be disposed in other regular shapes, such as a square shape, a hexagon shape, a circle shape, or an irregular shape, and accordingly, the light transmitting area 530 may have other shape outlines, which is not limited by the embodiments of the present disclosure.

It should be noted that the shape of the second electrode 522 of the light emitting element 520 in the embodiment shown in fig. 4A and 4B is only an exemplary illustration, and the specific shape or structure of the second electrode 522 is not limited by the embodiment of the disclosure as long as the second electrode 522 can block the light transmitting region 530 in the direction perpendicular to the substrate of the display substrate 10.

Hereinafter, the display substrate 10 provided in some embodiments of the present disclosure is specifically described with reference to a cross-sectional structure of the display substrate 10.

Fig. 5A is a schematic view of a partial cross-sectional structure of a display substrate according to some embodiments of the present disclosure, for example, fig. 5A is a schematic view of a cross-sectional structure along a line a-a' in fig. 4B.

For example, as shown in fig. 4A to 5A, the display substrate 10 includes a substrate 100, a driving circuit 310, a light emitting element 320, and a metal light shielding layer. The driving circuit 310 is located on the substrate 100, the metal light shielding layer is located on a side of the driving circuit 310 away from the substrate 100, and the light emitting element 320 is located on a side of the metal light shielding layer away from the driving circuit 310.

For example, the metal light shielding layer includes a first metal light shielding part 510 and a second metal light shielding part 520 surrounding the first metal light shielding part 510, the first metal light shielding part 510 and the second metal light shielding part 520 being insulated from each other and having a light transmitting region 530. The driving circuit 310 includes a first electrode 311 (i.e., a second electrode T52 of the second emission control transistor T5), and the first electrode 311 is electrically connected to the first metal light shielding part 510 through the first via 710. The light emitting element 320 includes a second electrode 322 (for example, the second electrode 322 may be an anode of the light emitting element 320), and the second electrode 322 is electrically connected to the first metal light shielding part 510 through a second via 720. An orthogonal projection of the second electrode 322 on the substrate base 100 overlaps an orthogonal projection of the light-transmitting region 530 on the substrate base 100. Therefore, the second electrode 322 and the light-transmitting region 530 of the metal light-shielding layer are overlapped with each other in the direction perpendicular to the substrate 100, so that the second electrode 322 shields the light-transmitting region 530 in the direction perpendicular to the substrate 100, and the leakage of the stray light incident from the display side of the display substrate 10 through the light-transmitting region 530 is reduced or filtered, and further, the second electrode 322 is matched with the first metal light-shielding portion 510 and the second metal light-shielding portion 520, so that the first light-transmitting opening 410 is shielded in the direction perpendicular to the substrate 100, and the leakage of the stray light incident from the display side of the display substrate 10 through the first light-transmitting opening 410 is reduced or filtered. Therefore, the light leakage phenomenon of the display substrate 10 during fingerprint identification is weakened or avoided, the adverse effect of stray light on fingerprint image acquisition is effectively weakened or avoided, and the fingerprint image acquired by the display substrate 10 is clearer and more accurate.

For example, in some embodiments of the present disclosure shown in fig. 4A-5A, an orthographic projection of the light-transmissive region 530 on the substrate base plate 100 is located within an orthographic projection of the second electrode 322 on the substrate base plate 100, and an area of the orthographic projection of the second electrode 322 on the substrate base plate 100 is larger than an area of the orthographic projection of the light-transmissive region 530 on the substrate base plate 100. Therefore, by the cooperation of the second electrode 322 and the metal light shielding layer, the second electrode 322 shields the entire overlapping region of the first light-transmitting opening 410 and the light-transmitting region 530 in the direction perpendicular to the substrate 100, thereby further reducing or preventing the stray light from leaking through the light-transmitting region 530. From this, can further weaken or the filtering to the stray light on the big visual angle direction, make the fingerprint image of the photosensitive element collection of display substrate 10 can guarantee certain formation of image visual angle to obtain the fingerprint image that the SNR is higher, thereby show and promote the definition that display substrate 10 is used for fingerprint identification's fingerprint image, optimized display substrate 10's fingerprint identification performance.

For example, in some embodiments of the present disclosure, as shown in fig. 5A, a width of an overlapping amount a of the second metal light-shielding portion 520 of the metal light-shielding layer and the second electrode 322 in a direction perpendicular to the substrate 100, that is, a width of an overlapping amount of an orthogonal projection of the second electrode 322 on the substrate 100 and an orthogonal projection of the second metal light-shielding portion 520 of the metal light-shielding layer on the substrate 100, may be, for example, 2.5 μm to 4 μm. For example, the value range of the width of the overlapping amount a may be further expanded, so as to better weaken or prevent the stray light on the display side of the display substrate 10 from leaking through the light-transmitting region 530, and further weaken or prevent the stray light from leaking through the first light-transmitting opening 410, thereby further weakening the interference of the stray light on the light reflected by the fingerprint acquired by the photosensitive element of the display substrate 10, so that the photosensitive element of the display substrate 10 may obtain a fingerprint image with a clearer and more accurate signal-to-noise ratio.

For example, the second metal light shielding portion 520 of the metal light shielding layer is insulated from the first metal light shielding portion 510, the first electrode 311 of the driving circuit 310, and the second electrode 322 of the light emitting element 320, respectively.

In some embodiments of the present disclosure, the first metal light shielding part 510 and the second metal light shielding part 520 of the metal light shielding layer may be configured to receive different electrical signals, respectively, for example, the second metal light shielding part 520 may be configured to receive the first voltage signal ELVDD.

For example, since the first metal light-shielding portion 510 and the second metal light-shielding portion 520 are made of opaque metal materials, and the second metal light-shielding portion 520 is distributed in a continuous sheet shape in the display region of the display substrate 10, stray light incident from the display side of the display substrate 10 can be shielded in a large area, and adverse effects of the stray light on the photosensitive imaging process of the display substrate 10 can be reduced or avoided.

For example, the second metal light shielding part 520 may be electrically connected to the first power line 214 through, for example, a via structure to receive the first voltage signal ELVDD, so that a transmission resistance of the first voltage signal ELVDD during transmission in the display area of the display substrate 10 may be reduced, and a voltage drop generated during transmission of the first voltage signal ELVDD may be reduced, thereby improving brightness uniformity of a display screen provided by the display substrate 10 and improving a display effect.

In addition, by applying the uniform first voltage signal ELVDD to the second metal light-shielding portion 520, the risk of static electricity generated between the second metal light-shielding portion 520 of the metal light-shielding layer and the first electrode 311 of the driving circuit 310 or between the second metal light-shielding portion and the second electrode 322 of the light-emitting element 320 can be reduced or prevented, and thus the interference on the image display of the display substrate 10 can be reduced or avoided.

For example, in the process of light shielding by the metal light shielding layer and the second electrode 322 of the light emitting device 320 in cooperation with each other, since the second metal light shielding part 520 of the metal light shielding layer does not need to be electrically connected to the second electrode 322, the setting position of the second metal light shielding part 520 in the plane parallel to the substrate 100 can be adjusted according to different practical application requirements, so as to better control the overlapping amount a of the second metal light shielding part 520 and the second electrode 322 in the direction perpendicular to the substrate 100, and reduce or avoid the leakage of stray light through the light transmitting region 530 of the metal light shielding layer, thereby achieving better light shielding effect of the display substrate 10 under the cooperation of the second electrode 322 and the metal light shielding layer.

It should be noted that, in some other embodiments of the present disclosure, the second metal light shielding portions 520 may also be disconnected or insulated from each other, and the embodiments of the present disclosure are not limited thereto.

In some other embodiments of the present disclosure, an area of an orthogonal projection of the second electrode 322 on the substrate base plate 100 may also be equal to an area of an orthogonal projection of the light-transmitting region 530 on the substrate base plate 100, so that under a condition that the second electrode 322 is ensured to cover the light-transmitting region 530, a manufacturing cost of the second electrode 322 may also be reduced, thereby reducing a manufacturing cost and a manufacturing process of the display base plate 10.

In some other embodiments of the present disclosure, the orthographic projection of the second electrode 322 on the substrate base plate 100 and the orthographic projection of the light-transmitting region 530 on the substrate base plate 100 may also partially overlap, and partially do not overlap, so that the leakage of the stray light incident from the display side of the display base plate 10 through the light-transmitting region 530 may be reduced, which is not limited by the embodiments of the present disclosure.

It should be noted that the specific shape of the second electrode 322 is not limited in the embodiments of the present disclosure, as long as the orthographic projection of the second electrode 322 on the substrate 100 can at least partially overlap with the orthographic projection of the light-transmitting region 530 on the substrate 100.

For example, as shown in connection with fig. 4A to 5A, the first light-transmitting opening 410 is configured to allow light incident from the display side of the display substrate 10 to pass therethrough, and an orthogonal projection of the first light-transmitting opening 410 on the substrate 100 partially overlaps an orthogonal projection of the light-transmitting region 530 on the substrate 100. Thus, in the pixel unit without the imaging aperture, the second electrode 322 blocks the light-transmitting region 530 in the direction perpendicular to the substrate 100, so that the metal light-shielding layer and the second electrode 322 cooperate with each other to block stray light that may enter from the display side of the display substrate 10, thereby reducing stray light that leaks to the driving circuit 310.

In some embodiments of the present disclosure, an orthogonal projection of the second electrode 322 on the substrate base plate 100 at least partially covers other portions of the orthogonal projection of the first light-transmitting opening 410 on the substrate base plate 100 except for a portion overlapping with an orthogonal projection of the light-transmitting region 530 on the substrate base plate 100. For example, in the embodiment shown in fig. 4A-5A, the orthographic projection of the second electrode 322 on the substrate base plate 100 completely covers the other parts of the orthographic projection of the first light-transmitting opening 410 on the substrate base plate 100 except the part overlapping with the orthographic projection of the light-transmitting region 530 on the substrate base plate 100. Therefore, by increasing the overlapping area of the second electrode 322 and the first light-transmitting opening 410 in the direction perpendicular to the substrate 100, the leakage of the stray light from the light-transmitting region 530 and the first light-transmitting opening 410 can be further reduced or avoided, and the light leakage phenomenon can be further reduced or avoided, so that the adverse effect of the stray light on the photosensitive imaging process of the display substrate 10 can be reduced or avoided, and the image obtained by the display substrate 10 can be clearer and more accurate.

For example, in some embodiments of the present disclosure, the second electrode 322 is an opaque electrode. For example, the second electrode 322 may be made of an opaque metal material (e.g., aluminum or silver) or other suitable opaque materials, and the like, which is not limited by the embodiments of the disclosure.

For example, in some embodiments of the present disclosure shown in fig. 4A-5A, in order to simplify the manufacturing process of the display substrate 10, the second electrode 322 (e.g., anode) of the light emitting element 320 is electrically connected to the first metal light shielding portion 510 of the metal light shielding layer, for example, the second electrode 322 is configured to receive an anode signal and cooperate with the third electrode 321 (e.g., cathode, see fig. 2) of the light emitting element 320 to make the light emitting layer of the corresponding light emitting element 320 emit light, so that the display substrate 10 performs, for example, a display operation.

For example, in some other embodiments of the present disclosure, the second electrode 322 (e.g., an anode) of the light emitting device 320 may also be electrically connected to the first metal light shielding portion 510 through an electrical connection member, such as an electrode, which is separately provided and disposed between the light emitting device 320 and the metal light shielding layer, which is not limited in this disclosure.

For example, in some embodiments of the present disclosure shown in fig. 4A to 5A, in order to simplify the manufacturing process of the display substrate 10, the second electrode T52 of the second light-emitting control transistor T5 (i.e., the first electrode 311 of the driving circuit 310) is configured to be connected to the first metal light-shielding portion 510 of the metal light-shielding layer, and further electrically connected to the second electrode 322 of the light-emitting element 320, that is, the first metal light-shielding portion 510 of the metal light-shielding layer is connected to one electrode of a certain transistor in the driving circuit of the pixel unit.

In some other embodiments of the present disclosure, the second diode T52 of the second emission control transistor T5 may also be electrically connected to the first metal shielding portion 510 through an electrical connector, such as an electrode, provided separately between the second diode T52 of the second emission control transistor T5 and the metal light shielding layer, that is, the first metal shielding portion 510 of the metal light shielding layer may be electrically connected to one electrode of a transistor in the driving circuit of the pixel unit through a separately provided electrode, which is not limited in the embodiments of the present disclosure.

For example, the material of the metal light shielding layer may include aluminum metal and titanium metal, for example, a three-layer metal structure of titanium-aluminum-titanium may be adopted, or the metal light shielding layer may also adopt other suitable opaque metal materials, which is not limited in this respect by the embodiment of the present disclosure. For example, in some other embodiments of the present disclosure, the metal light shielding layer may also be made of the same metal material as the source or the drain of the transistor in the driving circuit 310, so as to save the manufacturing cost of the display substrate 10 and optimize the manufacturing process flow of the display substrate 10.

For example, as shown in fig. 5A, the display substrate 10 further includes a first insulating layer 610 disposed between the first electrode 311 of the driving circuit 310 and the metal light shielding layer, and a second insulating layer 620 disposed between the metal light shielding layer and the second electrode 322 of the light emitting element 320. The first electrode 311 of the driving circuit 310 is electrically connected to the metal light shielding layer through a first via hole 710 at least disposed in the first insulating layer 610, the second electrode 322 of the light emitting device 320 is electrically connected to the metal light shielding layer through a second via hole 720 at least disposed in the second insulating layer 620, and the first electrode 311 and the second electrode 322 can be electrically connected through the first metal light shielding portion 510 of the metal light shielding layer to transmit corresponding electrical signals. For example, in case the second electrode 322 is used for an anode of the light emitting element 320, the first electrode 311 may be configured to provide a corresponding anode signal to the second electrode 322, so that the second electrode 322 cooperates with a cathode (i.e., the third electrode 321) of the light emitting element 320 to perform a corresponding, e.g., display operation.

For example, as shown in fig. 5A, the display substrate 10 further includes a buffer layer 670 on the substrate 100, and the active layer 312 of the driving circuit 310 is located on a side of the buffer layer 670 away from the substrate 100. For example, the buffer layer 670 may provide a relatively flat surface for the active layer 312 disposed on the buffer layer 670 to perform a planarization function. The buffer layer 670 can also block the intrusion of impurities, for example, and reduce or prevent the adverse effects on the buffer layer 670, such as the driver circuit 310 and the light-emitting element 320. In addition, the buffer layer 670 may also provide protection and support functions for other structures and functional layers (e.g., driving circuits, light emitting elements, etc.) located thereon.

For example, as shown in fig. 5A, the display substrate 10 further includes a first gate insulating layer 660, a second gate insulating layer 650, and an interlayer insulating layer 640. The first gate insulating layer 660 is located on a side of the buffer layer 670 and the active layer 312 away from the substrate 100, the second gate insulating layer 650 is located on a side of the first gate insulating layer 660 away from the substrate 100, and the interlayer insulating layer 640 is located on a side of the second gate insulating layer 650 away from the substrate 100.

For example, as shown in fig. 5A, the display substrate 10 further includes a passivation layer 630, and the passivation layer 630 is located between the first insulating layer 610 and the interlayer insulating layer 640, for example, at a side of the interlayer insulating layer 640 and the first electrode 311 away from the substrate 100. For example, the first via 710 penetrates at least the passivation layer 630.

For example, the first insulating layer 610, the second insulating layer 620, the passivation layer 630, the interlayer insulating layer 640, the first gate insulating layer 660, and the second gate insulating layer 650 are generally formed using an organic insulating material (e.g., acrylic resin) or an inorganic insulating material (e.g., silicon nitride SiNx or silicon oxide SiOx). For example, the passivation layer 630, the interlayer insulating layer 640, the first gate insulating layer 660, and the second gate insulating layer 650 may have a single-layer structure composed of silicon nitride or silicon oxide, or a double-layer structure composed of silicon nitride and silicon oxide. Embodiments of the present disclosure are not limited in this regard.

For example, as shown in fig. 5A, the first via 710 and the second via 720 may be at least partially overlapped in a direction perpendicular to the substrate base plate 100, for example, in a hole-in-hole structure.

In some embodiments, as shown in fig. 5B, the first via 710 and the second via 720 may also be staggered in a direction perpendicular to the substrate base plate 100. The embodiments of the present disclosure do not limit the arrangement positions of the first via 710 and the second via 720 in the direction perpendicular to the substrate base plate 100.

For example, in some embodiments of the present disclosure, the light emitting element 320 of the display substrate 10 further includes a pixel defining layer and a light emitting layer. The pixel defining layer is located on a side of the second electrode 322 far from the metal light shielding layer, the light emitting layer is located on a side of the pixel defining layer far from the second electrode 322, and the third electrode 321 (e.g., cathode) of the light emitting element 320 is located on a side of the light emitting layer far from the pixel defining layer.

For example, in the case where the second electrode 322 of the light emitting element 320 is an anode and the third electrode 321 (see fig. 2) is a cathode, the cathode may be a metal with a low work function, and the material of the cathode includes magnesium aluminum alloy (MgAl), lithium aluminum alloy (LiAl), magnesium, aluminum, lithium metal, or the like.

For example, in order to enable light reflected by a fingerprint to irradiate the photosensitive element, the cathode may be provided as a transparent electrode, or a light-transmitting opening may be opened on the cathode at a position corresponding to the imaging aperture, which is not limited in this embodiment of the disclosure.

For example, the pixel defining layer is generally formed using an organic insulating material (e.g., acrylic resin) or an inorganic insulating material (e.g., silicon nitride SiNx or silicon oxide SiOx).

For example, the material of the light emitting layer of the light emitting element 320 may be selected according to the color of light emitted therefrom, and the material of the light emitting layer includes a fluorescent light emitting material or a phosphorescent light emitting material. At present, a dopant system, that is, a dopant material is mixed into a host light emitting material to obtain a usable light emitting material, is generally used. For example, as the host light-emitting material, a metal compound material, an anthracene derivative, an aromatic diamine compound, a triphenylamine compound, an aromatic triamine compound, a biphenyldiamine derivative, a triarylamine polymer, or the like can be used

For example, in the display substrate 10 provided in some embodiments of the present disclosure, the substrate 100 may be used to provide a buffer, and the substrate 100 may be a flexible substrate made of Polyimide (PI), polypropylene (PP), Polycarbonate (PC), or the like, for example.

For example, the display substrate 10 may also include other structural or functional layers, which are not limited by the embodiments of the present disclosure.

For example, in some embodiments of the present disclosure, the display substrate may further include a second light-shielding layer. The second light shielding layer may be positioned between the metal light shielding layer and the light emitting element, and an orthogonal projection of the second electrode of the light emitting element on the base substrate, an orthogonal projection of the light transmitting region on the base substrate, and an orthogonal projection of the second light shielding layer on the base substrate partially overlap each other. Therefore, the second light shielding layer can be matched with the metal light shielding layer and the second electrode of the light-emitting element in the direction perpendicular to the substrate to shield light, stray light on the display side of the display substrate is further weakened or prevented from leaking, the definition of an acquired fingerprint image is improved, and the fingerprint identification performance of the display substrate is improved.

For example, since the display substrate 10 may be divided into a plurality of pixel units distributed in an array, and one light emitting element 320 is disposed in each pixel unit, the second electrodes 322 of the light emitting elements 320 in the plurality of pixel units may be distributed in an array on the display substrate 10. Furthermore, in order to simplify the manufacturing process of the display substrate 10, the plurality of first metal light-shielding portions 510 of the metal light-shielding layer are also distributed in an array on the display substrate 10.

Fig. 6 is a partial top view schematic diagram of another display substrate according to some embodiments of the present disclosure. For example, the pixel cell structure shown in fig. 6 includes a plurality of pixel cell structures shown in fig. 4B.

For example, as shown in fig. 6, the display substrate 10 may include a plurality of pixel units, such as a first pixel unit B1, a second pixel unit R2, and a third pixel unit G3.

For example, the first pixel cell B1 may be configured to emit blue light, the second pixel cell R2 may be configured to emit red light, and the third pixel cell G3 may be configured to emit green light.

For example, as shown in fig. 6, the plurality of first metal light-shielding portions 510 of the metal light-shielding layer are distributed corresponding to the first pixel cell B1, the second pixel cell R2, and the third pixel cell G3. Since the plurality of first metal light shielding portions 510 transmit, for example, an anode signal to the second electrodes 322 of the light emitting elements in the corresponding pixel cells B1, R2, and G3, respectively, the plurality of first metal light shielding portions 510 are insulated from each other.

For example, as shown in fig. 6, in order to simplify the manufacturing process of the display substrate 10, the second metal light shielding parts 520 may be electrically connected to each other and integrally formed, for example, the second metal light shielding parts 520 may be distributed in a continuous sheet shape on the display substrate 10. Thus, in the case that the second metal light-shielding portion 520 of the metal light-shielding layer is distributed in a continuous sheet shape, since the second metal light-shielding portion 520 may substantially cover, for example, the entire display region 101 of the display substrate 10 and the second metal light-shielding portion 520 is configured to be electrically connected to a power line (for example, the first power line 214 shown in fig. 2 or fig. 3) providing the first voltage signal ELVDD through, for example, a via structure to receive the first voltage signal, it is possible to reduce the transmission resistance of the first voltage signal ELVDD in the transmission process of the display region of the display substrate 10 through the second metal light-shielding portion 520, reduce the voltage drop of the first voltage signal ELVDD generated in the transmission process, thereby improving the brightness uniformity of the display screen provided by the display substrate 10 and achieving a more uniform brightness display effect when the display substrate 10 is used for displaying luminescence.

For example, in the fingerprint recognition area of the display substrate 10, imaging apertures are disposed in the pixel cells (e.g., the first pixel cell B1, the second pixel cell R2, the third pixel cell G3) at a certain pitch to implement a fingerprint recognition operation. For example, the imaging apertures are periodically arranged in the fingerprint identification area, for example, one imaging aperture may be arranged at intervals of a plurality of pixel units according to different actual needs, which is not limited in the embodiments of the present disclosure.

Fig. 7 is a partial top view of another display substrate according to some embodiments of the present disclosure, for example, fig. 7 is a partial top view of a pixel unit corresponding to the imaging aperture disposed in the fingerprint identification area 102 of the display substrate 10 shown in fig. 1.

It should be noted that, the local top view structure of the display substrate 10 shown in fig. 7 is substantially the same as or similar to the local top view structure of the display substrate 10 shown in fig. 3 except that the metal light shielding layer and the second electrode 322 of the light emitting element 320 are added, and therefore, the description thereof is omitted.

For example, as shown in fig. 7, in the pixel unit for fingerprint recognition in the display substrate 10, an orthogonal projection of the light transmitting region 530 on the base substrate (not shown) overlaps an orthogonal projection of the first light transmitting opening 410 on the base substrate, that is, in a direction perpendicular to the base substrate 100, portions of the first metal light shielding part 510 and the second metal light shielding part 520 corresponding to the first light transmitting opening 410 are hollowed out, so that light incident from the display side of the display substrate 10 can pass through the light transmitting region 530 and further through the first light transmitting opening 410 to be irradiated onto, for example, a photosensitive element for imaging.

For example, as shown in fig. 7, the second electrode 322 includes a second light-transmitting opening 420, and the second light-transmitting opening 420 is configured to allow light incident from the display side of the display substrate 10 to pass through and further pass through the light-transmitting region 530 and the first light-transmitting opening 410, so that the light incident from the display side of the display substrate 10 can be irradiated onto the photosensitive element for imaging, thereby enabling the display substrate 10 to realize a fingerprint recognition function.

For example, as shown in fig. 7, an orthographic projection of the second light-transmitting opening 420 on the substrate base plate is located in an orthographic projection of the first light-transmitting opening 410 on the substrate base plate, and an area of the orthographic projection of the second light-transmitting opening 420 on the substrate base plate is equal to an area of the orthographic projection of the first light-transmitting opening 410 on the substrate base plate, that is, in a direction perpendicular to the substrate base plate 100, a portion of the second electrode 322 corresponding to the first light-transmitting opening 410 is hollowed out to form the second light-transmitting opening 420.

For example, as shown in fig. 7, the second light-transmitting opening 420, the light-transmitting region 530 and the first light-transmitting opening 410 form a rectangular through hole penetrating through the second electrode 322, the metal light-shielding layer and the driving circuit 310 to serve as an imaging aperture, so that light reflected by a fingerprint of a finger is irradiated onto, for example, a photosensitive element of the display substrate 10 through the imaging aperture to be imaged, thereby enabling the display substrate 10 to realize a fingerprint identification function according to an acquired fingerprint image.

For example, the orthographic projection of the first light-transmitting opening 410 on the substrate base plate 100 is located in the orthographic projection of the photosensitive element on the substrate base plate 100, so that the light reflected by the finger fingerprint can be irradiated on the photosensitive element from the display side of the display base plate 10 through the rectangular imaging small hole formed by the second light-transmitting opening 420, the light-transmitting area 530 and the first light-transmitting opening 410 in a substantially collimated manner, and the fingerprint image collected by the photosensitive element is clearer and more accurate.

For example, in the fingerprint identification area of the display substrate 10, imaging apertures are provided in the pixel units at a certain pitch to realize a fingerprint identification operation. For example, in a pixel unit where an imaging aperture needs to be formed, a second light-transmitting opening 420 is opened on the second electrode 322, and a rectangular through hole penetrating the second electrode 322, the metal light-shielding layer and the driving circuit 310 is formed as the imaging aperture by the second light-transmitting opening 420, the light-transmitting region 530 and the first light-transmitting opening 410. For example, in the case that the imaging apertures are periodically arranged in the fingerprint identification area, the second electrode 322 is correspondingly provided with second light-transmitting openings 420 which are periodically arranged to form the imaging apertures. For example, according to different actual requirements, one imaging pinhole may be disposed at intervals between a plurality of pixel units, that is, the second electrode 322 and the metal light shielding layer are respectively hollowed out at intervals between a plurality of pixel units and the portion corresponding to the first light-transmitting opening 410.

At least one embodiment of the present disclosure further provides a method for manufacturing a display substrate, including: providing a substrate base plate; forming a first electrode of a driving circuit on a substrate; forming a metal light shielding layer on the first electrode; and forming a second electrode of the light emitting element on the metallic light shielding layer. The metal light shielding layer includes a first metal light shielding portion and a second metal light shielding portion at least partially surrounding the first metal light shielding portion, the first metal light shielding portion and the second metal light shielding portion being insulated from each other and having a light transmitting region. The first electrode is electrically connected with the first metal shading part through the first through hole, and the second electrode is electrically connected with the first metal shading part through the second through hole. An orthographic projection of the second electrode on the substrate base plate and an orthographic projection of the light-transmitting area on the substrate base plate are at least partially overlapped.

For example, the method for manufacturing a display substrate according to at least one embodiment of the present disclosure further includes: forming a first insulating layer between the first electrode and the metal shading layer, and forming a first through hole in the first insulating layer; and forming a second insulating layer between the second electrode and the metal shading layer, and forming a second through hole in the second insulating layer.

For example, the manufacturing method of the display substrate provided by some embodiments of the present disclosure may include more or less steps, and the order between the steps is not limited, and may be determined according to actual needs. For details and technical effects of the manufacturing method, reference may be made to the above description of the display substrate 10, and further description is omitted here.

At least one embodiment of the present disclosure further provides a display device, which includes the display substrate according to any embodiment of the present disclosure, for example, the display substrate 10 described above may be included.

The technical effects and the implementation principles of the display device provided by the embodiment of the disclosure are substantially the same as or similar to those of the display substrate described in the embodiment of the disclosure, and are not repeated herein.

For example, the display device provided in the embodiments of the present disclosure may be any product or component having a display function, such as a liquid crystal panel, an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator, and the embodiments of the present disclosure are not limited thereto.

For example, in some embodiments of the present disclosure, the display device may further include a fingerprint image processor, a pressure sensor, and a controller. The fingerprint image processor is configured to analyze and process a fingerprint image acquired by, for example, the photosensitive element for fingerprint identification, the pressure sensor is configured to sense a pressing action on the display side of the display device, and the controller is coupled or in signal connection with the pressure sensor, the photosensitive element and the fingerprint image processor respectively.

For example, when the pressure sensor senses the pressing action on the display side of the display device, a feedback signal is generated, and the controller controls the display device to emit light, i.e., to light the screen, after receiving the feedback signal sent by the pressure sensor. Meanwhile, the controller can also control the photosensitive element to start so as to collect a fingerprint image, and the fingerprint image is sent to the fingerprint image processor so as to carry out fingerprint identification, verification and the like of a user. In addition, the fingerprint image processor can also send the fingerprint identification result to the controller, so that the controller can carry out subsequent preset operation according to the fingerprint identification result.

For example, when the controller controls the display device to emit light to illuminate the screen, a system such as a mobile phone or a tablet computer may be in a standby state, waiting for a user to input a password or the like to unlock the system; accordingly, when the fingerprint identification is successful, the controller controls the system of the mobile phone or the tablet computer to enter a working state, for example, an operation interface of an application program before the mobile phone or the tablet computer is displayed in a rest screen state, which is not limited in this embodiment of the disclosure.

For example, the fingerprint image processor may be implemented by a general-purpose processor or a dedicated processor. The controller may be various types of integrated circuit chips having processing functionality, which may have various computing architectures such as a Complex Instruction Set Computer (CISC) architecture, a Reduced Instruction Set Computer (RISC) architecture, or an architecture that implements a combination of instruction sets. In some embodiments, the controller may be a microprocessor, such as an X86 processor or an ARM processor, or may be a Digital Signal Processor (DSP), or the like.

For example, the display device provided in the embodiments of the present disclosure may further include other devices, such as a driving chip, a memory, and the like, which is not limited in this respect.

The following points need to be explained:

(1) the drawings of the embodiments of the disclosure only relate to the structures related to the embodiments of the disclosure, and other structures can refer to the common design.

(2) For purposes of clarity, the thickness of layers or regions in the figures used to describe embodiments of the present disclosure are exaggerated or reduced, i.e., the figures are not drawn on a true scale. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

(3) Without conflict, embodiments of the present disclosure and features of the embodiments may be combined with each other to arrive at new embodiments.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A display substrate, comprising: a substrate, a driving circuit, a light emitting element and a metal light shielding layer;

the driving circuit is positioned on the substrate, the metal shading layer is positioned on one side of the driving circuit, which is far away from the substrate, and the light-emitting element is positioned on one side of the metal shading layer, which is far away from the driving circuit;

the metal light shielding layer includes a first metal light shielding portion and a second metal light shielding portion at least partially surrounding the first metal light shielding portion,

the first metal light shielding part and the second metal light shielding part are insulated from each other and have a light transmission area;

the driving circuit comprises a first electrode, and the first electrode is electrically connected with the first metal shading part through a first through hole;

the light-emitting element comprises a second electrode which is electrically connected with the first metal shading part through a second through hole;

an orthographic projection of the second electrode on the substrate base plate and an orthographic projection of the light-transmitting area on the substrate base plate are at least partially overlapped.

2. The display substrate of claim 1, wherein an orthographic projection of the light transmissive region on the substrate is within an orthographic projection of the second electrode on the substrate.

3. The display substrate according to claim 2, wherein an area of an orthogonal projection of the second electrode on the substrate is larger than an area of an orthogonal projection of the light-transmitting region on the substrate.

4. A display substrate according to any one of claims 1-3, wherein the driving circuitry comprises a first light transmissive opening configured to allow light incident from the display side of the display substrate to pass through.

5. The display substrate of claim 4, wherein an orthographic projection of the first light-transmissive opening on the substrate partially overlaps with an orthographic projection of the light-transmissive region on the substrate.

6. The display substrate according to claim 5, wherein an orthographic projection of the second electrode on the substrate at least partially covers other portions of the orthographic projection of the first light-transmitting opening on the substrate than a portion overlapping with the orthographic projection of the light-transmitting region on the substrate.

7. The display substrate of claim 4, wherein an orthographic projection of the first light-transmissive opening on the substrate is within an orthographic projection of the light-transmissive region on the substrate.

8. The display substrate of claim 7, wherein the second electrode comprises a second light-transmissive opening configured to allow light incident from the display side of the display substrate to pass through and further through the light-transmissive region and the first light-transmissive opening.

9. The display substrate of claim 8, wherein an orthographic projection of the second light-transmitting opening on the substrate is located within an orthographic projection of the first light-transmitting opening on the substrate, and an area of the orthographic projection of the second light-transmitting opening on the substrate is equal to an area of the orthographic projection of the first light-transmitting opening on the substrate.

10. The display substrate according to any one of claims 1 to 3, wherein the driving circuit further comprises a first transistor,

the first electrode is configured as a source or a drain of the first transistor.

11. The display substrate according to any one of claims 1 to 3, wherein the driving circuit further comprises a first transistor,

the first transistor is positioned on one side of the first electrode far away from the metal shading layer,

the source or the drain of the first transistor is electrically connected to the first electrode.

12. A display substrate according to any one of claims 1-3, wherein the first and second vias are at least partially arranged one above the other in a direction perpendicular to the substrate base, or

The first through holes and the second through holes are arranged in a staggered mode in the direction perpendicular to the substrate base plate.

13. The display substrate of any of claims 1-3, wherein an orthographic projection of the first via on the substrate and an orthographic projection of the second via on the substrate at least partially overlap, or

The orthographic projection of the first via hole on the substrate base plate and the orthographic projection of the second via hole on the substrate base plate do not overlap with each other.

14. The display substrate of any of claims 1-3, further comprising a first insulating layer and a second insulating layer,

wherein the first insulating layer is located between the first electrode and the metallic light shield layer, the second insulating layer is located between the second electrode and the metallic light shield layer,

the first through hole is formed in the first insulating layer, and the second through hole is formed in the second insulating layer.

15. A display substrate according to any one of claims 1 to 3, wherein the second electrode is an opaque electrode.

16. The display substrate of any of claims 1-3, wherein the first and second metal light shield portions are configured to receive different electrical signals, respectively.

17. The display substrate according to any one of claims 1 to 3, wherein the light-emitting element further comprises a pixel defining layer, a light-emitting layer, and a third electrode,

the pixel defining layer is positioned on one side of the second electrode far away from the metal shading layer,

the light-emitting layer is located on a side of the pixel defining layer remote from the second electrode,

the third electrode is positioned on one side of the light-emitting layer far away from the pixel defining layer.

18. The display substrate of claim 4, further comprising a photosensitive element,

the photosensitive element is located on one side of the driving circuit far away from the metal light shielding layer and is configured to receive light which is incident from the display side of the display substrate and passes through the first light-transmitting opening.

19. A display substrate according to claim 18, wherein an orthographic projection of the first light-transmissive opening on the substrate is within an orthographic projection of the light-sensing element on the substrate.

20. A display device comprising the display substrate of claim 1.