CN110767739B

CN110767739B - Display substrate and display device

Info

Publication number: CN110767739B
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: 2025-09-09
Anticipated expiration: 2039-11-28
Also published as: CN110767739A

Abstract

A display substrate and a display device are provided, wherein the display substrate comprises a substrate, a driving circuit, a light emitting element and a metal shading layer. The light-emitting element comprises a first electrode, a second electrode, a light-emitting element and a light-emitting element, wherein the first electrode is electrically connected with the light-emitting element through a first via hole, the light-emitting element comprises a second electrode, the second electrode is electrically connected with the light-emitting element through a second via hole, and the orthographic projection of the second electrode on the substrate and the orthographic projection of the light-transmitting area on the substrate at least partially overlap.

Description

Display substrate and display device

Technical Field

Embodiments of the present disclosure relate to a display substrate and a display device.

Background

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

Disclosure of Invention

The display substrate comprises a substrate base plate, a driving circuit, a light emitting element and a metal shading layer, wherein the driving circuit is located on the substrate base plate, the metal shading layer is located on one side, away from the substrate base plate, of the driving circuit, the light emitting element is located on one side, away from the driving circuit, of the metal shading layer, the metal shading layer comprises a first metal shading portion and a second metal shading portion at least partially surrounding the first metal shading portion, the first metal shading portion and the second metal shading portion are insulated from each other and are provided with a light transmission area, the driving circuit comprises a first electrode, the first electrode is electrically connected with the first metal shading portion through a first through hole, the light emitting element comprises a second electrode, the second electrode is electrically connected with the first metal shading portion through a second through hole, and the orthographic projection of the second electrode on the substrate base plate and the orthographic projection of the light transmission area on the substrate base plate at least partially overlap.

For example, in a display substrate provided in at least one embodiment of the present disclosure, the orthographic projection of the light-transmitting region on the substrate is located within the orthographic 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 orthographic projection of the second electrode on the substrate is larger than an area of 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, the driving circuit includes a first light-transmitting opening configured to allow light incident from a display side of the display substrate to pass through.

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 overlaps with an orthographic projection portion of the light-transmitting region on the substrate.

For example, in the display substrate provided in at least one embodiment of the present disclosure, the orthographic projection of the second electrode on the substrate at least partially covers the other portion of the orthographic projection of the first light-transmitting opening on the substrate except for the portion overlapping with the 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 orthographic projection of the first light-transmitting opening on the substrate is located within 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, 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, the orthographic projection of the second light-transmitting opening on the substrate is located within the orthographic projection of the first light-transmitting opening on the substrate, and the orthographic projection area of the second light-transmitting opening on the substrate is equal to the orthographic projection area of the first light-transmitting opening on the substrate.

For example, in the 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 the 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 the 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 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 an orthographic projection of the first via on the substrate and an orthographic projection of the second via on the substrate do not overlap each other.

For example, the display substrate provided in 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 insulating layer is provided with the first via hole, and the second insulating layer is provided with the second via hole.

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 portion and the second metal light shielding portion are configured to receive different electrical signals, respectively.

For example, in the 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 for the display substrate to further include a photosensitive element, wherein the photosensitive element is located at a side of the driving circuit away from the metal light shielding layer and is 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 orthographic projection of the first light-transmitting opening on the substrate is located within an orthographic projection of the photosensitive 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.

The manufacturing method of the display substrate comprises the steps of providing a substrate, forming a first electrode of a driving circuit on the substrate, forming a metal shading layer on the first electrode, and forming a second electrode of a light emitting element on the metal shading layer, wherein 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, the first metal shading part and the second metal shading part are insulated from each other and are provided with light transmission areas, the first electrode is electrically connected with the first metal shading part through a first through hole, the second electrode is electrically connected with the first metal shading part through a second through hole, and the orthographic projection of the second electrode on the substrate and the orthographic projection of the light transmission areas on the substrate are at least partially overlapped.

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

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure, not to limit 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 top view of a display substrate according to some embodiments of the present disclosure;

FIGS. 4A-4B are partial top views of alternative display substrates provided in accordance with some embodiments of the present disclosure;

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

FIG. 5B is a schematic diagram of a partial cross-sectional structure of another display substrate provided in some embodiments of the present disclosure;

FIG. 6 is a schematic partial top view of a display substrate according to some embodiments of the present disclosure, and

Fig. 7 is a schematic partial top view of a display substrate according to still another embodiment of the disclosure.

Detailed Description

For the purpose of making 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 clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms 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 elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items.

Currently, one way to achieve off-screen fingerprint recognition is to integrate a photosensitive element (e.g., a photosensitive image sensor) with a fingerprint recognition function into a display device, and perform fingerprint image acquisition by using a pinhole imaging principle in combination with the photosensitive element. For example, small holes are formed in a display area of the display device according to a certain interval to serve as imaging small holes, so that light reflected by finger fingerprints can be irradiated onto the photosensitive element through the imaging small holes to be imaged, and further the display device can analyze and process acquired fingerprint images to realize a fingerprint identification function. However, in the process of acquiring the fingerprint image by the photosensitive element, since light reflected by the fingerprint of the finger or light incident from the outside may form stray light in a large viewing angle direction, and the stray light may be irradiated onto the photosensitive element through other places except for the imaging aperture, so as to cause light leakage phenomenon, further interfere with the imaging result on the photosensitive element, and affect 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 for the imaging aperture in the display device needs to be weakened 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 driving circuit is positioned on the substrate, the metal shading layer is positioned on one side of the driving circuit far away from the substrate, and the light emitting element is positioned on one side of the metal shading layer 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 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 via hole. The light emitting element includes a second electrode electrically connected to the first metal light shielding portion through a second via. The orthographic projection of the second electrode on the substrate and the orthographic projection of the light-transmitting region on the substrate overlap at least partially.

According to the display substrate provided by the embodiment of the disclosure, the second electrode and the light-transmitting area in the metal shading layer are overlapped with each other in the direction perpendicular to the substrate, so that stray light leaking from the display side of the display substrate can be reduced or filtered, the light leakage phenomenon is reduced or avoided, and adverse effects of the stray light on the photosensitive imaging process of the display substrate are reduced or avoided, and images acquired by the display substrate are clearer and more accurate.

Some embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that the same reference numerals in different drawings will be used to refer to the same elements already 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 recognition area 102. The fingerprint recognition area 102 may be a partial area or an entire area of the display area 101, thereby enabling the display substrate 10 to implement a partial-screen fingerprint recognition function or a full-screen fingerprint recognition function. For example, openings (for example, small holes) may be formed in the fingerprint recognition area 102 at a certain interval to serve as imaging small holes, so that light reflected by the finger fingerprint is irradiated onto, for example, a photosensitive element of the display substrate 10 through the imaging small holes to perform imaging, and further, the display substrate 10 may acquire a fingerprint image of a user and perform analysis processing on the acquired fingerprint image to implement a fingerprint recognition function.

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

Since the OLED display substrate has a self-luminous characteristic, the light emission brightness of a pixel unit for display thereof can be controlled or adjusted as needed, and thus, for example, a fingerprint image capturing process can be facilitated, and the integration of a display device including the OLED display substrate can be further facilitated to be improved. The embodiment of the present disclosure is described taking the display substrate 10 as an OLED display substrate as an example, but this is not limiting to the embodiment of the present 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 imaged by irradiating openings opened at a certain pitch onto a photosensitive element located on, for example, a back side of the display substrate 10 opposite to the display side, using the principle of pinhole imaging, 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 skin texture image of the user acquired by the photosensitive element, for example, the display substrate 10 performs corresponding operations according to a preset control flow after fingerprint recognition of 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 the path of the reflected light irradiated onto the photosensitive element is shortened, so that the skin texture image collected by the photosensitive element is more accurate and clear.

For example, the photosensitive element may be a photosensitive image sensor, and the display device including the display substrate 10 may perform fingerprint recognition, palm print recognition, or the like by acquiring light reflected by the skin of the user to form a user skin texture image such as a fingerprint or palm print image. 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, palmprints, such as finger molds, etc., as embodiments of the present disclosure are not limited in this regard.

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

The embodiments of the present disclosure take fingerprint image collection by the photosensitive element as an example, and the structure, the function, etc. of the display substrate provided by some embodiments of the present disclosure are described, but this is not a limitation of the embodiments of the present disclosure.

For example, the display area 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 by a driving circuit, and control the emission luminance of the OLED as needed. For example, the driving circuit may be a 2T1C circuit based, that is, a basic function of driving the OLED to emit light using two thin film transistors and one storage capacitor, or may be a circuit of other structures, such as a 4T1C, 4T2C, 6T1C, or 8T2C circuit, etc. For example, the anode of the OLED may be electrically connected to the source or drain of, for example, a driving transistor or a light emission control transistor in a driving circuit to obtain an anode signal, which in turn cooperates with the cathode of the OLED to cause the light emitting layer of the OLED to emit light.

Next, a display substrate provided by some embodiments of the present disclosure will be described by taking a circuit configuration in which a driving circuit includes 7T1C as an example. It should be noted that embodiments of the present disclosure include, but are not limited to, these.

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 the 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 element 320 is an Organic Light Emitting Diode (OLED), and the light emitting element 320 emits red light, green light, blue light, white light, or the like under the driving of its corresponding driving circuit 310.

For example, the voltage signal line may be one or may include a plurality of voltage signal lines.

For example, as shown in fig. 2, the voltage signal lines include at least one of a first power line 214, a second power line 14, a light emission control signal line 110, a first initialization signal line 212, a second initialization signal line 211, a first reset control signal line 111, a 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 different colors of light. 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 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 supply a constant first voltage signal ELVDD to the driving circuit 310, the second power line 14 is configured to supply 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 an emission control signal EM to the driving circuit 310. The first initialization signal line 212 and the second initialization signal line 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 not limited thereto, and may be less than or equal to the second voltage signal ELVSS, for example.

For example, as shown in fig. 2, the driving circuit 310 includes a driving transistor T1, a data writing transistor T2, a threshold compensating transistor T3, a first light emitting control transistor T4, a second light emitting control 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 to drive the light emitting element 320 to emit light 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, a second voltage signal ELVSS supplied from the second power line 14, and the like.

For example, in a pixel unit of an OLED display substrate, a driving transistor is electrically connected to an organic light emitting element, and a driving current is outputted to the organic light emitting element under 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 schematic partial top view of a display substrate according to some embodiments of the disclosure. For example, fig. 3 is a partial top view of the display substrate 10 shown in fig. 1.

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

The display substrate 10 provided in the embodiments of the present 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 control transistor T4 and the gate T50 of the second light emission control transistor T5 are both connected to the light emission control signal line 110. For example, as shown in fig. 3, a part of the light emission control signal line 110 serves as a gate T40 of the first light emission control transistor T4. For example, as shown in fig. 3, a part of the light emission control signal line 110 serves as a 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-transmitting opening 410 is located between the first light-emitting control transistor T4 and the second light-emitting control transistor T5, the position of the first light-transmitting opening 410 is defined in the first direction X.

For example, as shown in fig. 3, the first light emission control transistor T4, the first light transmission opening 410, and the second light emission control transistor T5 are arranged in the first direction X. For example, the first pole T41 of the first light emission control transistor T4 and the second pole T52 of the second light emission control transistor T5 are located at the same side of the light emission control signal line 110, and a wire connecting the center of the first pole T41 of the first light emission control transistor T4 and the center of the second pole T52 of the second light emission control 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. The line connecting the center of the first pole T41 of the first light emission control transistor T4 and the center of the second pole T52 of the second light emission control 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-emitting control signal line 110. The first pole T41 of the first light emission control transistor T4 and the second pole T52 of the second light emission control 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 pole T51 and the second pole T52 of the second light emission control transistor T5 are electrically connected to the second pole T12 of the driving transistor T1 and the second electrode 322 (not shown in fig. 3, refer to fig. 2 or 4B) of the light emitting element 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 along 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 electrode 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 electrode 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 electrode 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 electrode 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 control transistor T4 is electrically connected to the light emission control signal line 110, and the first and second poles T41 and T42 of the first light emission control transistor T4 are electrically connected to the first power supply line 214 and the first pole T11 of the driving transistor T1, respectively. The gate T50 of the second light emission control transistor T5 is electrically connected to the light emission control signal line 110, and the first and second electrodes T51 and T52 of the second light emission control transistor T5 are electrically connected to the second electrode T12 of the driving transistor T1 and the second electrode 322 of the light emitting element 320 (see fig. 2), respectively. A 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 the source and drain may be indistinguishable in structure. In the embodiments of the present disclosure, in order to distinguish between two poles of a transistor except a gate, one of which is a first pole and the other of which is a second pole, it is directly described that all or part of the first pole and the second pole of the transistor are interchangeable as required in the embodiments of the present disclosure. For example, the first pole of the transistor in the embodiments of the disclosure may be a source, and the second pole may be a drain, or the first pole of the transistor may be a drain, and the second pole may be a source.

In addition, transistors can be classified into N-type and P-type transistors according to their characteristics. The embodiments of the present disclosure will be described by taking P-type transistors as examples. Based on the description and teaching of this implementation of the disclosure, those of ordinary skill in the art will readily recognize that implementations in which at least some of the transistors in the pixel circuit structure of the embodiments of the disclosure are N-type transistors, i.e., N-type transistors or a combination of N-type and P-type transistors, are also within the scope of the 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 at 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 such 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 and second poles T21 and T22 of the data writing transistor T2 are electrically connected to the data line 213 and the first pole 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 via the second connection electrode 31 b.

For example, as shown in fig. 3, in order to facilitate formation of the first light-transmitting opening 410, an edge of the first power line 214 near the data line 213 is equidistant from the data line 213 at each location.

For example, as shown in fig. 3, the gate line 113 extends in the first direction X, and the gate line 113 is located 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 located 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 the via hole 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 the via hole VH21, and the second connection electrode 31b is connected to the gate T10 of the driving transistor T1 through the via hole 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 unit 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 electrode T52 of the second light 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 the light emitting element 320 formed later.

In the embodiment of the disclosure, as shown in fig. 3, the gate T40 of the first light emitting control transistor T4 is a part of the light emitting control signal line 110, the gate T50 of the second light emitting control transistor T5 is a part of the light emitting control 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 control signal line 111, and the gate T70 of the second reset transistor T7 is a part of the second reset control signal line 112.

For example, the octagonal line boxes 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 writing transistor T2 through the via hole VH1, the first power line 214 is electrically connected to the first pole T41 of the first light emitting control transistor T4 through the via hole VH2, the first power line 214 is electrically connected to the first pole C11 of the storage capacitor C1 through the via hole VH3, the first power line 214 is electrically connected to the connection element 215 through the via hole VH0, and the connection element 215 is connected in parallel with the first power line 214, thereby functioning to reduce the resistance. One end of the first connection electrode 31a is electrically connected to the second initialization signal line 211 through the via hole VH11, and the other end of the first connection electrode 31a is connected to the first electrode T61 of the first reset transistor T6 through the via hole VH12, so that the first electrode 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 hole 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 hole 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 hole VH31, and the other end of the third connection electrode 31c is electrically connected to the first electrode T71 of the second reset transistor T7 through the via hole VH32, so that the first electrode 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 emission control transistor T5 through the via hole VH 40.

For example, in fig. 3, the second reset transistor T7 in the upper left corner, the first reset transistor T6 in the lower right corner, the driving transistor T1, the data writing transistor T2, the threshold value compensating transistor T3, the first light emission controlling transistor T4, and the second light emission controlling transistor T5 constitute 7 transistors shown in fig. 2, namely 7 transistors in the driving circuit in one pixel unit.

In some embodiments, the imaging apertures for implementing 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 a certain pitch to implement the fingerprint recognition operation. The first light-transmitting opening 410 in the fingerprint identification area 102, which is not used as an imaging aperture, is shielded by 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, so that stray light emitted from the display side of the display substrate 10 is weakened or avoided from leaking down through the first light-transmitting opening 410, which is not used as an imaging aperture, and further, adverse effects of the stray light on the photosensitive imaging process of the display substrate 10 are weakened or avoided, and the image acquired by the display substrate 10 is clearer and more accurate.

Fig. 4A-4B are partial top views of alternative display substrates provided in some embodiments of the present disclosure. For example, fig. 4A and 4B are partial top-down schematic views of pixel units without imaging apertures (i.e., the first light-transmitting openings 410 do not act as imaging apertures) within the fingerprint recognition area 102 corresponding to the display substrate 10 shown in fig. 1.

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 for adding the metal shielding layer, and the partial top view structure of the display substrate 10 shown in fig. 4B is substantially the same as or similar to the partial top view structure of the display substrate 10 shown in fig. 3 except for adding the metal shielding layer and the second electrode 322 of the light emitting element 320, and will not be repeated herein.

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

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

For example, as shown in fig. 4A and 4B, the second electrode 322 of the light emitting element 320 partially overlaps the light transmitting region 530 in the direction perpendicular to the substrate of the display substrate 10, and thus a portion of the first light transmitting opening 410 overlapping each other in the direction perpendicular to the substrate of the display substrate 10 with the light transmitting region 530 may be shielded, 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 may be shielded, so that stray light incident from the display side of the display substrate 10 may be prevented or reduced from leaking through the light transmitting region 530. Furthermore, the second electrode 522 of the light emitting element 520 can shield the entire area of the first light transmitting opening 410 with the first metal shielding portion 510 and the second metal shielding portion 520 by shielding the light transmitting area 530, so as to weaken or avoid stray light entering from the display side of the display substrate 10 from leaking down through the light transmitting area 530 or the first light transmitting opening 410 which are not imaging apertures, weaken or avoid adverse effects of the stray light 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 fig. 4B, the first metal light shielding portion 510 is octagonal, and the outline of the light-transmitting region 530 may be correspondingly octagonal, and in other embodiments of the present disclosure, the first metal light shielding portion 510 may be further configured to have other regular shapes or irregular shapes, such as square, hexagon, circle, etc., and accordingly, the light-transmitting region 530 may be configured to have other shapes and outlines, which are not limited by the embodiments of the present disclosure.

Note that, the shape of the second electrode 522 of the light emitting element 520 in the embodiment shown in fig. 4A and 4B is merely an example, 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, and the specific shape or structure of the second electrode 522 is not limited in the embodiment of the present disclosure.

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

Fig. 5A is a schematic diagram 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 diagram 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 disposed on the substrate 100, the metal shielding layer is disposed on a side of the driving circuit 310 away from the substrate 100, and the light emitting element 320 is disposed on a side of the metal shielding layer away from the driving circuit 310.

For example, the metal light shielding layer includes a first metal light shielding portion 510 and a second metal light shielding portion 520 surrounding the first metal light shielding portion 510, the first metal light shielding portion 510 and the second metal light shielding portion 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 pole T52 of the second light emission control transistor T5), and the first electrode 311 is electrically connected to the first metal light shielding portion 510 through the first via 710. The light emitting element 320 includes a second electrode 322 (e.g., 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 portion 510 through the second via 720. The orthographic projection of the second electrode 322 on the substrate 100 overlaps the orthographic projection of the light-transmitting region 530 on the substrate 100. Thus, the second electrode 322 and the light-transmitting region 530 of the metal light shielding layer overlap 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 stray light emitted from the display side of the display substrate 10 is reduced or filtered out and leaks through the light-transmitting region 530, and further, the second electrode 322 cooperates with the first metal light shielding portion 510 and the second metal light shielding portion 520, shields the first light-transmitting opening 410 in the direction perpendicular to the substrate 100, and reduces or filters stray light emitted from the display side of the display substrate 10 and leaks through the first light-transmitting opening 410. 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 illustrated in fig. 4A-5A, the orthographic projection of the light transmissive region 530 onto the substrate 100 is located within the orthographic projection of the second electrode 322 onto the substrate 100, and the orthographic projection of the second electrode 322 onto the substrate 100 is larger in area than the orthographic projection of the light transmissive region 530 onto the substrate 100. Therefore, by the mutual cooperation of the second electrode 322 and the metal shielding layer, the second electrode 322 shields the whole area overlapping the first light-transmitting opening 410 and the light-transmitting area 530 in the direction perpendicular to the substrate 100, so that stray light is further weakened or prevented from leaking down through the light-transmitting area 530. Therefore, stray light in the large viewing angle direction can be further weakened or filtered, so that a certain imaging viewing angle can be ensured for the fingerprint image collected by the photosensitive element of the display substrate 10, so that a fingerprint image with higher signal to noise ratio is obtained, the definition of the fingerprint image of the display substrate 10 for fingerprint identification is obviously improved, and the fingerprint identification performance of the display substrate 10 is optimized.

For example, in some embodiments of the present disclosure, as shown in fig. 5A, the width of the overlapping amount a of the second metal light shielding portion 520 of the metal light shielding layer and the second electrode 322 in the direction perpendicular to the substrate 100, that is, the width of the overlapping amount of the orthographic projection of the second electrode 322 on the substrate 100 and orthographic 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 range of the width of the overlapping amount a can be further enlarged, so that stray light on the display side of the hybrid display substrate 10 can be better reduced or prevented from leaking through the light-transmitting region 530, and stray light can be further reduced or prevented from leaking through the first light-transmitting opening 410, so that interference of the stray light on light reflected by fingerprints acquired by the photosensitive element of the display substrate 10 can be further reduced, and the photosensitive element of the display substrate 10 can acquire a fingerprint image with clearer accuracy and higher signal to noise ratio.

For example, the second metal light shielding portion 520 of the metal light shielding layer is insulated from each other by 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 portion 510 and the second metal light shielding portion 520 of the metal light shielding layer may be configured to receive different electrical signals, respectively, for example, the second metal light shielding portion 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 an opaque metal material and the second metal light shielding portion 520 is continuously distributed in a sheet shape in the display area 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 a transmission process of the display area of the display substrate 10 may be reduced, a voltage drop generated during the transmission process 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 electrode 322 of the light emitting element 320 can be reduced or prevented, thereby reducing or avoiding interference with the display of the picture on the display substrate 10.

For example, in the process of mutually matching the metal light shielding layer with the second electrode 322 of the light emitting element 320 to perform light shielding, since the second metal light shielding portion 520 of the metal light shielding layer does not need to be electrically connected with the second electrode 322, the setting position of the second metal light shielding portion 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 portion 520 and the second electrode 322 in the direction perpendicular to the substrate 100, and reduce or avoid stray light leaking through the light transmitting region 530 of the metal light shielding layer, thereby enabling the display substrate 10 to achieve a better light shielding effect under the mutual matching of the second electrode 322 and the metal light shielding layer.

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

In other embodiments of the present disclosure, the area of the orthographic projection of the second electrode 322 on the substrate 100 may also be equal to the area of the orthographic projection of the light-transmitting region 530 on the substrate 100, so that the manufacturing cost of the second electrode 322 may be reduced while ensuring that the second electrode 322 can cover the light-transmitting region 530, thereby reducing the manufacturing cost and manufacturing process of the display substrate 10.

In other embodiments of the present disclosure, the front projection of the second electrode 322 on the substrate 100 and the front projection of the light-transmitting region 530 on the substrate 100 may also partially overlap, and partially not overlap, so that stray light incident from the display side of the display substrate 10 may be reduced from leaking down through the light-transmitting region 530, 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, so long as the orthographic projection of the second electrode 322 on the substrate 100 may 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-5A, the first light-transmitting opening 410 is configured to allow light incident from the display side of the display substrate 10 to pass through, and the orthographic projection of the first light-transmitting opening 410 on the substrate 100 overlaps with the orthographic projection of the light-transmitting region 530 on the substrate 100. Thus, in the pixel unit where no imaging aperture is provided, by shielding the light transmitting region 530 by the second electrode 322 in the direction perpendicular to the substrate 100, the metal light shielding layer and the second electrode 322 can cooperate with each other to shield stray light possibly entering from the display side of the display substrate 10, and stray light leaking to the driving circuit 310 can be reduced.

In some embodiments of the present disclosure, the orthographic projection of the second electrode 322 on the substrate 100 at least partially covers other portions of the orthographic projection of the first light-transmitting opening 410 on the substrate 100 than the portion overlapping the orthographic projection of the light-transmitting region 530 on the substrate 100. For example, in the embodiment shown in fig. 4A-5A, the front projection of the second electrode 322 on the substrate 100 completely covers the other portion of the front projection of the first light-transmitting opening 410 on the substrate 100 than the portion overlapping the front projection of the light-transmitting region 530 on the substrate 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, stray light leaking from the light-transmitting region 530 and the first light-transmitting opening 410 can be further reduced or avoided, the light leakage phenomenon can be further reduced or avoided, and adverse effects of the stray light on the photosensitive imaging process of the display substrate 10 can be further reduced or avoided, so that the image acquired by the display substrate 10 is 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 metallic material (e.g., aluminum or silver) or other suitable opaque material, and the like, as embodiments of the present disclosure are not limited in this regard.

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 with the first metal light shielding portion 510 of the metal light shielding layer, e.g., the second electrode 322 is configured to receive an anode signal and to co-act with the third electrode 321 (e.g., cathode, see fig. 2) of the light emitting element 320 to cause the light emitting layer of the corresponding light emitting element 320 to emit light, so that the display substrate 10 performs, for example, a display operation.

For example, in other embodiments of the present disclosure, the second electrode 322 (e.g., anode) of the light emitting element 320 may also be electrically connected to the first metal light shielding portion 510 through an electrical connection such as an electrode that is provided separately and disposed between the light emitting element 320 and the metal light shielding layer, which is not limited by the embodiments of the present 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 emission 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 thus to be electrically connected to the second electrode 322 of the light emitting element 320, i.e., the first metal light shielding portion 510 of the metal light shielding layer is connected to one pole of a certain transistor in the driving circuit of the pixel unit.

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

For example, the material of the metallic light-shielding layer may include aluminum metal and titanium metal, for example, may be a three-layer metallic structure of titanium-aluminum-titanium, or other suitable opaque metallic materials may also be employed for the metallic light-shielding layer, as embodiments of the present disclosure are not limited in this regard. For example, in other embodiments of the present disclosure, the metal light shielding layer may also be made of the same metal material as the source or 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 shielding layer through at least the first via 710 disposed in the first insulating layer 610, and the second electrode 322 of the light emitting element 320 is electrically connected to the metal shielding layer through at least the second via 720 disposed in the second insulating layer 620, so that the first electrode 311 and the second electrode 322 can be electrically connected through the first metal shielding portion 510 of the metal shielding layer to transmit corresponding electrical signals. For example, in the case where the second electrode 322 is used for the 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 such that the second electrode 322 cooperates with the 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 disposed on the substrate 100, and the active layer 312 of the driving circuit 310 is disposed on a side of the buffer layer 670 away from the substrate 100. For example, the buffer layer 670 may provide a relatively planar surface for the active layer 312 disposed on the buffer layer 670 to function as planarization. The buffer layer 670 may also block the intrusion of, for example, impurities, and reduce or prevent the driving circuit 310, the light-emitting element 320, and the like, which are located on the buffer layer 670, from being adversely affected. In addition, the buffer layer 670 may also provide protection and support functions to other structural 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 at 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 at a side of the first gate insulating layer 660 away from the substrate 100, and the interlayer insulating layer 640 is located at 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, on 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., an 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 disposed at least partially overlapping in a direction perpendicular to the substrate 100, for example, in a hole-over-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 100. 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 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 away from the metal shielding layer, the light emitting layer is located on a side of the pixel defining layer away 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 away 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 a material of the cathode includes magnesium aluminum alloy (MgAl), lithium aluminum alloy (LiAl), or magnesium, aluminum, lithium metal, or the like.

For example, in order that the light reflected by the fingerprint may be irradiated to the photosensitive element, the cathode may be provided as a transparent electrode, or a light-transmitting opening may be formed in the cathode at a position corresponding to the imaging aperture, which is not limited in the embodiment of the present 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. Currently, a doping system is generally used, i.e. a doping material is mixed into the host luminescent material to obtain a usable luminescent material. For example, the host light-emitting material may be 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

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, for example, polyimide (PI), polypropylene (PP), polycarbonate (PC), or the like.

For example, the display substrate 10 may also include other structural or functional layers, as embodiments of the present disclosure are not limited in this regard.

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 located between the metal light shielding layer and the light emitting element, and an orthographic projection of the second electrode of the light emitting element on the substrate, an orthographic projection of the light transmitting region on the substrate, and an orthographic projection of the second light shielding layer on the substrate partially overlap each other. Therefore, the second shading layer can be mutually matched with the metal shading layer and the second electrode of the light-emitting element in the direction perpendicular to the substrate to shade light, stray light leakage of the display side of the display substrate is further weakened or prevented, the definition of the acquired fingerprint image is further 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 of still another display substrate provided in 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 unit B1 may be configured to emit blue light, the second pixel unit R2 may be configured to emit red light, and the third pixel unit 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 unit B1, the second pixel unit R2, and the third pixel unit G3. Since the plurality of first metal light shielding portions 510 transmit, for example, anode signals to the second electrodes 322 of the light emitting elements within the corresponding pixel units B1, R2, 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 portions 520 may be electrically connected to each other and integrally formed, for example, the second metal light shielding portions 520 may be distributed in a continuous sheet shape on the display substrate 10. Thus, in case that the second metal light shielding portions 520 of the metal light shielding layer are distributed in a continuous sheet shape, since the second metal light shielding portions 520 may cover substantially the entire display area 101 of the display substrate 10, for example, and the second metal light shielding portions 520 are configured to be electrically connected to a power line (for example, the first power line 214 shown in fig. 2 or 3) providing the first voltage signal ELVDD through, for example, a via structure to receive the first voltage signal, the transmission resistance of the first voltage signal ELVDD during the transmission of the display area of the display substrate 10 may be reduced by the second metal light shielding portions 520, the voltage drop of the first voltage signal ELVDD generated during the transmission may be reduced, thereby improving the brightness uniformity of the display screen provided by the display substrate 10, so that the display substrate 10 may achieve a more uniform brightness display effect when used for displaying light emission.

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

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

Note that, the partial top view structure of the display substrate 10 shown in fig. 7 is substantially the same as or similar to the partial top view structure of the display substrate 10 shown in fig. 3 except for the addition of the metal light shielding layer and the second electrode 322 of the light emitting element 320, and will not be repeated herein.

For example, as shown in fig. 7, in the pixel unit for fingerprint recognition in the display substrate 10, the orthographic projection of the light transmitting region 530 on the substrate (not shown) overlaps with the orthographic projection of the first light transmitting opening 410 on the substrate, that is, in the direction perpendicular to the substrate 100, the portions of the first metal light shielding portion 510 and the second metal light shielding portion 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 pass 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, thereby allowing light incident from the display side of the display substrate 10 to be irradiated onto the photosensitive element for imaging, and further allowing the display substrate 10 to realize a fingerprint recognition function.

For example, as shown in fig. 7, the orthographic projection of the second light-transmitting opening 420 on the substrate is located within the orthographic projection of the first light-transmitting opening 410 on the substrate, and the orthographic projection area of the second light-transmitting opening 420 on the substrate is equal to the orthographic projection area of the first light-transmitting opening 410 on the substrate, that is, in the direction perpendicular to the substrate 100, the 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 the second electrode 322, the metal light-shielding layer and the driving circuit 310 as an imaging aperture, so that the light reflected by the finger fingerprint 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 recognition function according to the acquired fingerprint image.

For example, the front projection of the first light-transmitting opening 410 on the substrate 100 is located in the front projection of the photosensitive element on the substrate 100, so that the light reflected by the finger fingerprint can be substantially collimated and irradiated onto the photosensitive element from the display side of the display substrate 10 after passing through the rectangular imaging aperture formed by the second light-transmitting opening 420, the light-transmitting region 530 and the first light-transmitting opening 410, so that the fingerprint image collected by the photosensitive element is clearer and more accurate.

For example, in the fingerprint recognition area of the display substrate 10, imaging apertures are provided in the pixel unit at a certain pitch to realize fingerprint recognition operation. For example, in the pixel unit where the imaging aperture is required, the second light-transmitting opening 420 is opened on the second electrode 322, and the second light-transmitting opening 420, the light-transmitting region 530 and the first light-transmitting opening 410 form a rectangular through hole penetrating the second electrode 322, the metal light-shielding layer and the driving circuit 310 as the imaging aperture. For example, in the case that the imaging apertures are periodically arranged in the fingerprint recognition area, the second electrode 322 is correspondingly provided with the second light-transmitting openings 420 that are periodically arranged to form the imaging apertures. For example, according to different practical requirements, one imaging aperture may be disposed at intervals of a plurality of pixel units, that is, the second electrode 322 and the portion corresponding to the first light-transmitting opening 410 of the metal light-shielding layer are hollowed out at intervals of a plurality of pixel units, which is not limited in arrangement density of the imaging aperture according to the embodiment of the disclosure.

At least one embodiment of the present disclosure also provides a method of fabricating a display substrate, the method including providing a substrate, 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 metal light shielding layer. 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 a light transmission area. The first electrode is electrically connected with the first metal shading part through the first via hole, and the second electrode is electrically connected with the first metal shading part through the second via hole. The orthographic projection of the second electrode on the substrate and the orthographic projection of the light-transmitting region on the substrate overlap at least partially.

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

For example, the method for manufacturing the display substrate provided in some embodiments of the present disclosure may include more or fewer steps, and the order between the steps is not limited, and may be determined according to actual requirements. For details and technical effects of the manufacturing method, reference is made to the above description of the display substrate 10, and no further description is given here.

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

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

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, which is not limited in the embodiments of the present disclosure.

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 the photosensitive element for fingerprint identification, the pressure sensor is configured to sense a pressing action of the display side of the display device, and the controller is respectively coupled or in signal connection with the pressure sensor, the photosensitive element and the fingerprint image processor.

For example, when the pressure sensor senses a 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 after receiving the feedback signal sent by the pressure sensor, that is, lights up the screen, for example, a light emitting element of the display device itself may emit light, or an external light source (for example, backlight) may cause the display device to emit light. Meanwhile, the controller can also control the photosensitive element to start so as to collect fingerprint images, and the fingerprint images are 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 perform 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, the system of the mobile phone or the tablet computer may be in a standby state, waiting for a user to input a password or the like to unlock the system, and correspondingly, when fingerprint identification is successful, the controller controls the system of the mobile phone or the tablet computer to enter a working state, such as displaying an operation interface of an application program before the screen-off state, etc., which is not limited in the embodiment of the present disclosure.

For example, the fingerprint image processor may be implemented by a general purpose processor or a special purpose processor. The controller may be various types of integrated circuit chips with processing functions that may have various computing architectures such as a Complex Instruction Set Computer (CISC) architecture, a Reduced Instruction Set Computer (RISC) architecture, or a architecture that implements a variety of instruction set combinations. In some embodiments, the controller may be a microprocessor, such as an X86 processor or ARM processor, or may be a digital processor (DSP) or the like.

For example, the display apparatus provided by the embodiments of the present disclosure may further include other devices, such as a driving chip, a memory, etc., to which the embodiments of the present disclosure are not limited.

The following points need to be described:

(1) The drawings of the embodiments of the present disclosure relate only to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

(2) In the drawings for describing embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced for clarity, i.e., the drawings are not drawn to actual 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) The embodiments of the present disclosure and features in the embodiments may be combined with each other to arrive at a new embodiment without conflict.

The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A display substrate comprises a substrate, a driving circuit, a light emitting element and a metal shading layer;

Wherein the driving circuit is located on the substrate, the driving circuit comprises a first light-transmitting opening configured to allow light incident from a display side of the display substrate to pass through, the metal light shielding layer is located on a side of the driving circuit away from the substrate, and the light emitting element is located on a side of the metal light shielding layer 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 shading part and the second metal shading 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 via hole;

the light emitting element comprises a second electrode, and the second electrode is electrically connected with the first metal shading part through a second via hole;

the orthographic projection of the second electrode on the substrate and the orthographic projection of the light-transmitting area on the substrate are at least partially overlapped;

Wherein, the orthographic projection of the first light-transmitting opening on the substrate is overlapped with the orthographic projection part of the light-transmitting area on the substrate.

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 of claim 2, wherein an area of the orthographic projection of the second electrode on the substrate is greater than an area of the orthographic projection of the light-transmitting region on the substrate.

4. The display substrate of claim 1, wherein the orthographic projection of the second electrode on the substrate at least partially covers other portions of the orthographic projection of the first light-transmissive opening on the substrate than the portion overlapping the orthographic projection of the light-transmissive region on the substrate.

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

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

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

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

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

7. A display substrate according to any of claims 1-3, wherein the first via and the second via are arranged at least partially overlapping in a direction perpendicular to the substrate, or

The first through holes and the second through holes are staggered in the direction perpendicular to the substrate.

8. A display substrate according to any of claims 1-3, wherein the orthographic projection of the first via on the substrate and the orthographic projection of the second via on the substrate at least partially overlap, or

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

9. A display substrate according to any one of claims 1 to 3, further comprising a first insulating layer and a second insulating layer,

Wherein the first insulating layer is positioned between the first electrode and the metal light shielding layer, the second insulating layer is positioned between the second electrode and the metal light shielding layer,

The first via hole is arranged in the first insulating layer, and the second via hole is arranged in the second insulating layer.

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

11. A display substrate according to any one of claims 1-3, wherein the first metal light shielding portion and the second metal light shielding portion are configured to receive different electrical signals, respectively.

12. A 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 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 a side of the light emitting layer away from the pixel defining layer.

13. The display substrate according to claim 1, further comprising a photosensitive element,

The light-sensitive element is positioned on one side of the driving circuit away from the metal shading 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.

14. The display substrate of claim 13, wherein an orthographic projection of the first light-transmissive opening onto the substrate is within an orthographic projection of the photosensitive element onto the substrate.

15. A display device comprising the display substrate according to claim 1.