CN113064516A

CN113064516A - Display panel and display device

Info

Publication number: CN113064516A
Application number: CN202110310841.2A
Authority: CN
Inventors: 陈昊; 康梦华; 丁立薇
Original assignee: Hefei Visionox Technology Co Ltd
Current assignee: Hefei Visionox Technology Co Ltd
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-07-02

Abstract

The application relates to a display panel and a display device. The display panel includes: a substrate; a light emitting layer on the substrate; and the light emitting units are positioned on one side of the light emitting layer, which is far away from the substrate, and are used for emitting detection light to a target object positioned on one side of the light emitting surface of the display panel, wherein the detection light is invisible light which can penetrate through the display panel. The display panel can improve the light intensity projected to a target object, avoid the problem that light is blocked by elements in the display panel and is diffracted and interfered, and improve the accuracy of identifying the target object.

Description

Display panel and display device

Technical Field

The present application relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

The face recognition technology has the advantages of no need of contact, convenience, rapidness, strong secrecy and the like, and compared with a common two-dimensional imaging recognition mode, the three-dimensional face recognition technology with higher safety is widely applied to the field of display. However, most display screens equipped with the face recognition technology are 'Liuhai screens', are not all-sided screens in the true sense, and influence the visual impression of users.

Disclosure of Invention

The utility model aims at providing a display panel and display device, this display panel can improve the light intensity of projecting to the target object, avoids light to be blockked by the component in the display panel and takes place the problem of diffraction interference.

In one aspect, an embodiment of the present application provides a display panel, including: a substrate; a light emitting layer on the substrate; and the light emitting units are positioned on one side of the light emitting layer, which is far away from the substrate, and are used for emitting detection light to a target object positioned on one side of the light emitting surface of the display panel, wherein the detection light is invisible light which can penetrate through the display panel.

According to an aspect of the embodiments of the present application, the light emitting layer includes a plurality of light emitting elements, and an orthogonal projection of the light emitting unit on the substrate and an orthogonal projection of the light emitting elements on the substrate do not overlap each other.

According to an aspect of the embodiment of the present application, the display panel further includes an encapsulation layer, the encapsulation layer is located on a side of the light emitting layer away from the substrate, and the plurality of light emitting units are located on a side of the encapsulation layer away from the substrate.

According to an aspect of the embodiment of the application, the display panel further includes a touch layer, the touch layer is located on a side of the encapsulation layer away from the substrate, the touch layer includes a plurality of touch electrodes and a plurality of touch leads, and an orthographic projection of the light emitting unit on the substrate and an orthographic projection of the touch electrode or the touch lead on the substrate do not overlap with each other.

According to one aspect of the embodiments of the present application, the plurality of light emitting units are located on the touch layer.

According to one aspect of an embodiment of the present application, a display panel includes a first display region and a second display region at least partially surrounding the first display region, a light transmittance of the first display region being greater than a light transmittance of the second display region; the light-emitting layer comprises a first electrode layer and a second electrode layer, the second electrode layer is positioned on one side of the first electrode layer, which is far away from the substrate, the first electrode layer comprises a plurality of first electrodes positioned in the first display area, the second electrode layer comprises a plurality of light-transmitting parts positioned in the first display area, and the orthographic projection of the light-transmitting parts on the substrate and the orthographic projection of the first electrodes on the substrate are not overlapped with each other; preferably, an orthographic projection shape of the first electrode and/or the light-transmitting portion on the substrate includes at least one of a circle, an ellipse, and a polygon; alternatively, at least a part of the outer edge of the orthographic projection of the first electrode and/or the light-transmitting portion on the substrate is shaped like a curve.

According to an aspect of the embodiments of the present application, the light emitting element includes a first light emitting element located in the first display region, the display panel further includes a pixel defining layer located between the substrate and the light emitting layer, the pixel defining layer includes a plurality of first pixel openings located in the first display region, at least a portion of the first light emitting element is located in the corresponding first pixel opening; preferably, the orthographic projection shape of the first pixel opening on the substrate includes at least one of a circle, an ellipse, and a polygon; alternatively, at least part of the outer edge of the orthographic projection of the first pixel opening on the substrate is shaped as a curve.

According to an aspect of the embodiments of the present application, the display panel further includes a driving array layer, the driving array layer being located between the substrate and the light emitting layer, the driving array layer including a first pixel circuit; the first pixel circuit is positioned in the first display area, and the first light-emitting element is electrically connected with the first pixel circuit through the through hole; the first pixel circuit and the orthographic projection of the first electrode on the substrate are mutually overlapped.

According to an aspect of the embodiment of the present application, the display panel further includes a driving array layer, the driving array layer is located between the substrate and the light emitting layer, the driving array layer includes a first pixel circuit, the first pixel circuit is located in the second display area, the first light emitting element is electrically connected to the first pixel circuit through a signal line, and the signal line is a transparent conductive line at least in the first display area.

On the other hand, an embodiment of the present application provides a display device, including: the display panel as described above; the light receiving unit is positioned on one side of the display panel, which is far away from the light-emitting surface, and probe light emitted by the plurality of light emitting units of the display panel enters the light receiving unit after being reflected by the target object, so that the light receiving unit acquires depth information of the target object; the camera shooting unit is positioned on one side of the display panel, which is far away from the light emergent surface, and is used for acquiring the image information of the target object, and the display device identifies the target object through the depth information and the image information.

According to a display panel and display device of this application embodiment, through will be as a plurality of light emission units integration in whole display panel of discernment light source, for placing the technical scheme at the display panel back with light emission unit, be favorable to reducing display device's thickness, improve the light intensity of projecting the target object, avoid light to be blockked by the component in the display panel and take place the problem of diffraction interference, improved the accuracy of discernment target object.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Fig. 1 is a schematic diagram illustrating an effect of face recognition performed by a display device according to an embodiment of the present application;

fig. 2 is a schematic top view of a display panel according to an embodiment of the present application;

FIG. 3 shows a cross-sectional view along A-A of FIG. 2;

FIG. 4 is a schematic diagram illustrating a top view structure of a touch layer in the display panel shown in FIG. 2;

FIG. 5 is a schematic diagram showing an enlarged structure of a region B of the display panel shown in FIG. 2;

FIG. 6 shows a cross-sectional view of FIG. 5 along the direction D-D;

FIG. 7 illustrates a cross-sectional view along the direction D-D of an enlarged schematic structural view of region B of a display panel according to an alternative embodiment of the present application;

FIG. 8 illustrates an enlarged schematic view of region B of a display panel according to an alternative embodiment of the present application;

FIG. 9 shows a cross-sectional view of FIG. 8 taken along the direction E-E;

FIG. 10 shows a cross-sectional view of region B of a display panel in the direction E-E according to another alternative embodiment of the present application;

fig. 11 illustrates a schematic top view structure of a display panel according to another alternative embodiment of the present application.

Description of reference numerals:

1-a display panel; o-target object; AA 1-first display area; AA 2-second display area; a T-light transmission part; h-a light hole; an L-signal line; x-a first direction; y-a second direction;

11-a substrate; 12-a light emitting layer;

121-a first light emitting element; 12 a-a first electrode layer; 12 b-a second electrode layer; 12c — a first light emitting structure; 12 d-a second light emitting structure; 122-a second light emitting element;

13-a touch layer; 131-a light emitting unit; 1311-emitter lead; 1312-a light emitting element; 132-touch electrodes; 132 a-first touch electrode; 132 b-a second touch electrode; 133-touch lead;

14-driving the array layer; 15-a planarization layer; 16-pixel definition layer; p1-first pixel circuit; p2-second pixel circuit; 17-an encapsulation layer;

2-a light receiving unit; 3-camera unit.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present application; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

With the rapid development of display technologies, in display devices such as mobile phones and tablet computers, three-dimensional (3D) face recognition or iris recognition has the advantages of no need of contact, convenience, rapidness, strong secrecy and the like, and gradually becomes an identity verification mode replacing fingerprint recognition. In the correlation technique, the infrared emitter is usually placed on the back of the display panel for 3D face recognition, which results in insufficient intensity of infrared light spot signals projected to the face of a user, and the transmittance of infrared light passing through the display panel is low, and the diffraction phenomenon easily occurs, which affects the accuracy of face recognition.

In order to solve the above problem, embodiments of the present application provide a display panel and a display device. Fig. 1 is a schematic diagram illustrating an effect of face recognition performed by a display device according to an embodiment of the present application.

Referring to fig. 1, a display device according to an embodiment of the present application includes a display panel 1, a light receiving unit 2, and an image capturing unit 3.

A plurality of light emitting units 131 are integrated in the display panel 1, and the light emitting units 131 are identification light sources.

The light receiving unit 2 is located on a side of the display panel 1 away from the light exit surface, and the probe light emitted by the light emitting units 131 of the display panel 1 enters the light receiving unit 2 after being reflected by the target object O, so that the light receiving unit 2 obtains depth information of the target object O.

The camera unit 3 is located on a side of the display panel 1 away from the light exit surface, and is configured to obtain image information of the target object O, and the display device identifies the target object O through the depth information and the image information.

In order to authenticate the user, the target object O may be a face or an iris of an eyeball of the user. The plurality of light emitting units 131 are integrated in the display panel 1, and probe light emitted by the plurality of light emitting units 131 enters the light receiving unit 2 after being reflected by the face of the user, so as to obtain depth information of the face of the user. The imaging unit 3 acquires image information of the user's face, which may be, for example, texture information of the user's face. The characteristic face spectrum of the user can be drawn through the depth information and the texture image information of the face of the user, and the face of the user is finally recognized through the algorithm processing of the display device to realize identity verification.

The embodiment of the application provides a display device, including display panel 1, light receiving element 2 and camera unit 3, through will be as a plurality of light emission unit 131 integration in display panel 1 of discernment light source, for placing light emission unit 131 in the technical scheme at the display panel 1 back, be favorable to reducing display device's thickness, improve the light intensity of projecting target object O, avoid light to be blockked by the component in display panel 1 and take place the problem of diffraction interference, the accuracy of discernment target object O has been improved.

The following describes in detail a specific structure of a display panel provided in an embodiment of the present application with reference to the drawings.

Fig. 2 is a schematic top view illustrating a display panel according to an embodiment of the present application, and fig. 3 is a cross-sectional view of fig. 2 along a direction a-a.

In the display panel 1 provided in the embodiment of the present application, the display panel 1 may be an Organic Light Emitting Diode (OLED) display panel, a Light Emitting Diode (LED) display panel, a Quantum Dot Light Emitting Diode (QLED) display panel, a liquid crystal display panel, and the like.

As shown in fig. 2, the display panel 1 includes a first display area AA1 and a second display area AA2 at least partially surrounding the first display area AA1, and the light transmittance of the first display area AA1 is greater than that of the second display area AA 2. For example, the first display area AA1 of the display panel 1 is located at an upper middle position, and the second display area AA2 is disposed to surround the first display area AA 1.

Alternatively, the light transmittance of the first display area AA1 is greater than or equal to 15%. In order to ensure that the light transmittance of the first display area AA1 is greater than 15%, or greater than 40%, or even higher, the light transmittance of each functional film layer in the first display area AA1 is greater than 80%, or even at least a portion of the functional film layers is greater than 90%.

As shown in fig. 3, the display panel 1 includes: a substrate 11, a light emitting layer 12, and a plurality of light emitting units 131.

The substrate 11 may be at least one of a glass substrate, a Polyimide (PI) thin film, and a high light transmittance plastic plate. Alternatively, the substrate 11 includes two different materials, such as an organic material such as a PI thin film and an inorganic material such as a high-transmittance plastic plate, which are stacked and alternately disposed, and the material of the outermost layer of the substrate 11 is an organic material.

The light emitting layer 12 is located on the substrate 11. The light emitting units 131 are located on a side of the light emitting layer 12 away from the substrate 11, and are configured to emit a detection light to the target object O located on a side of the light emitting surface of the display panel 1, where the detection light is a non-visible light that can pass through the display panel 1.

Alternatively, the non-visible light emitted by the light emitting unit 131 is infrared light. The spectral range of the infrared light may be 780nm to 1100 nm. Optionally, the spectral range of the infrared light is 850nm to 940 nm. The light receiving unit 2 as described above may be an infrared light receiving unit, such as an infrared camera. Because the infrared light has strong penetrating power and small distortion in the transmission process of the display panel 1, the signal of the detection light penetrating through each film layer in the display panel 1 can be more effectively enhanced, and the accuracy of identifying the target object O is improved.

The display panel 1 provided in the embodiment of the present application includes a substrate 11, a light emitting layer 12, and a plurality of light emitting units 131 located on a side of the light emitting layer 12 away from the substrate 11, where the plurality of light emitting units 131 are configured to emit, to a target object O located on a light emitting surface side of the display panel 1, a non-visible light that can penetrate through the display panel 1. The display panel 1 integrates the plurality of light emitting units 131 on one side of the light emitting surface of the light emitting layer 12, and the distance between the plurality of light emitting units 131 and the light emitting surface of the display panel 1 is short, so that compared with the technical scheme that the plurality of light emitting units 131 are placed on one side of the display panel 1 deviating from the light emitting surface, the light intensity projected to the target object O can be improved, the problem that the light is blocked by the internal elements of the display panel 1 and diffraction interference occurs is avoided, and the accuracy of identifying the target object O is improved.

In some embodiments, as shown in fig. 2, the number of the first display areas AA1 is one, and the light receiving unit 2 and the image pickup unit 3 are respectively provided corresponding to the first display area AA 1. In some embodiments, the number of the first display areas AA1 is at least two, the light receiving unit 2 is disposed corresponding to at least one of the first display areas AA1, and the image pickup unit 3 is disposed corresponding to another at least one of the first display areas AA 1. It is understood that the number and the position of the first display areas AA1 may be determined according to the specific design requirements of the light receiving unit 2 and the camera unit 3, and will not be described in detail.

Therefore, the first display area AA1 with high light transmittance is constructed on the display panel 1, the light receiving unit 2 and the camera unit 3 for three-dimensional face recognition can be placed on one side of the display panel 1, which is away from the light emitting surface, corresponding to the first display area AA1, so that the first display area AA1 can display pictures while achieving high light transmittance, full-screen display is achieved, and user experience is improved.

In some embodiments, the light emitting layer 12 includes a plurality of light emitting elements capable of emitting visible light, and an orthographic projection of the light emitting unit 131 on the substrate 11 and an orthographic projection of the light emitting elements on the substrate 11 do not overlap each other.

As shown in fig. 2, alternatively, the light emitting elements include a plurality of first light emitting elements 121 positioned in the first display area AA1 and a plurality of second light emitting elements 122 positioned in the second display area AA 2. The first and second

light emitting elements

121 and 122 may be any one of an OLED, an LED, a Micro-LED, a submillimeter LED (Mini-LED), or a QLED. The LED is a universal light emitting body, the Micro-LED is a light emitting body with the grain size of less than 100 micrometers, the grain size of the Mini-LED is between that of a common LED and that of the Micro-LED, and the grain size of the Mini-LED is generally 100-300 micrometers.

Fig. 2 shows only a portion of the second light emitting element 122 and a portion of the light emitting unit 131 positioned at the second display area AA 2. The orthographic projection of the light emitting unit 131 on the substrate 11 and the orthographic projection of the first light emitting element 121 or the second light emitting element 122 on the substrate 11 do not overlap each other.

As shown in FIG. 3, the light emitting unit 131 comprises a light emitting element 1312 and an emitting element lead 1311 electrically connected to the light emitting element 1312, wherein the emitting element lead 1311 is used for driving the light emitting element 1312 to operate. Therefore, the plurality of light emitting units 131 are arranged in the whole display area of the display panel 1, and do not block the emitted light from the first light emitting element 121 or the second light emitting element 122 towards the light emitting surface, which is beneficial to improving the detection accuracy of the recognition target object O.

In some embodiments, as shown in fig. 2 and 3, the display panel 1 further includes an encapsulation layer 17, the encapsulation layer 17 is located on a side of the light emitting layer 12 facing away from the substrate 11, and the plurality of light emitting units 131 are located on a side of the encapsulation layer 17 facing away from the substrate 11.

The encapsulation layer 17 covers the film layer where the light emitting layer 12 is located, so that the internal structure of the display panel 1 can be effectively prevented from being corroded by water and oxygen, and the service life of the display panel 1 is prolonged. Optionally, a plurality of light emitting units 131 are disposed on the encapsulation layer 17 in a lattice manner. Alternatively, the light emitting units 131 may also be disposed on the package layer 17 in other shapes according to specific requirements, such as a cross shape, an X shape, a circle shape, and the like. Therefore, the plurality of infrared rays emitted by the plurality of ray emitting units 131 can be directly projected onto the target object O while avoiding a metal or low transmittance film layer below the encapsulation layer 17, such as the driving array layer 14, thereby improving the intensity of the detection light projected onto the target object O and avoiding the problem of diffraction interference of the display panel.

It is understood that the light emitting unit 131 may be located on any film layer of the encapsulation layer 17 on the side away from the substrate 11, and is not limited to being located on the encapsulation layer 17, as long as the orthographic projection of the light emitting unit 131 on the substrate 11 and the orthographic projection of the first light emitting element 121 or the second light emitting element 122 on the substrate 11 do not overlap each other.

Fig. 4 is a schematic top view illustrating a touch layer of the display panel shown in fig. 2.

In some embodiments, as shown in fig. 3 and 4, the display panel 1 further includes a touch layer 13, the touch layer 13 is located on a side of the encapsulation layer 17 away from the substrate 11, the touch layer 13 includes a plurality of touch electrodes 132 and a plurality of touch leads 133 electrically connected to the plurality of touch electrodes 132, and an orthographic projection of the light emitting unit 131 on the substrate 11 and an orthographic projection of the touch electrodes 132 or the touch leads 133 on the substrate 11 do not overlap each other. The light emitting unit 131 does not affect the touch function of the touch layer 13.

In the embodiment of the present application, the display panel has two modes: an operating mode and an authentication mode. In the working mode, the light emitting units 131 are turned off, and the touch layer 13 is used for sensing a touch event; in the authentication mode, the plurality of light emitting units 131 are turned on to identify a target object O, such as a face or an iris of an eyeball, of the user, thereby completing authentication of the user.

In some embodiments, the plurality of light emitting units 131 are located on the touch layer 13 to further reduce the overall thickness of the display panel 1.

Specifically, the touch layer 13 further includes a touch substrate, where the touch substrate includes a first surface and a second surface opposite to each other, and the second surface is located on a side of the first surface facing away from the substrate 11. Optionally, the light emitting unit 131 is located on the second surface, and the touch electrode and the touch lead are located on the first surface. Optionally, the light emitting unit, a portion of the touch electrodes and a portion of the touch leads 133 corresponding thereto are located on the second surface, and another portion of the touch electrodes and a portion of the touch leads 133 corresponding thereto are located on the first surface.

Fig. 5 illustrates an enlarged structure view of a region B of the display panel shown in fig. 2, and fig. 6 illustrates a cross-sectional view of fig. 5 along a direction D-D.

As shown in fig. 5 and 6, the light-emitting layer 12 includes a first electrode layer 12a and a second electrode layer 12b, and the second electrode layer 12b is located on a side of the first electrode layer 12a facing away from the substrate 11. The first electrode layer 12a includes a plurality of first electrodes located in the first display area AA1, and the second electrode layer 12b includes a plurality of light-transmitting portions T located in the first display area AA1, and an orthographic projection of the light-transmitting portions T on the substrate 11 and an orthographic projection of the first electrodes on the substrate 11 do not overlap each other. Alternatively, one of the first electrode layer 12a and the second electrode layer 12b is an anode, and the other is a cathode. Here, the first electrode layer 12a is used as an anode, and the second electrode layer 12b is used as a cathode.

Alternatively, the material of the light-transmitting portion T includes at least one of Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Aluminum Zinc Oxide (AZO), gallium-doped zinc oxide (GZO), Zinc Tin Oxide (ZTO), Gallium Tin Oxide (GTO), fluorine-doped tin oxide (FTO), zinc oxide (ZnOx), indium oxide (InOx), polyethylenedioxythiophene-polystyrenesulfonic acid PEDOT: PSS, graphene, and carbon nanotubes. The light-transmitting portion T may be formed on the second electrode layer 12b by laser etching, metal mask evaporation, or the like, and may be filled with a corresponding material.

When the material of the light-transmitting portion T includes at least one of the above materials, the conductivity of the material can be satisfied, and the material has a high light transmittance, so that normal display in the first display area AA1 is ensured, the light transmittance of the second electrode layer 12b is improved, the light transmittance of the first display area AA1 is further improved, and the lighting requirements of the light receiving unit 2 and the camera unit 3 are satisfied.

Preferably, an orthographic projection shape of the light-transmitting portion T on the substrate 11 includes at least one of a circle, an ellipse, and a polygon. Alternatively, at least a part of the outer edge shape of the orthographic projection of the light-transmitting portion T on the substrate 11 is a curved line.

When the light-transmitting portion T is implemented in any of the above manners, a plurality of irregular light-transmitting shapes (regular shapes, e.g., rectangles) may be formed on the second electrode layer 12b, and the plurality of light-transmitting portions T with irregular shapes are arranged in the first display area AA1 in an irregular manner (regular arrangement, e.g., array), so that the problem of diffraction interference generated by the light-transmitting portions T can be avoided, and the light collection quality of the light receiving unit 2 or the image capturing unit 3 can be improved.

Preferably, the orthographic shape of the first electrode on the substrate 11 includes at least one of a circle, an ellipse, and a polygon. Optionally, at least part of the outer edge of the orthographic projection of the first electrode on the substrate 11 is shaped as a curve.

When the first electrodes are implemented in any of the above manners, a plurality of irregular shapes (regular shapes, e.g., rectangles) may be formed, and a plurality of first electrodes having irregular shapes are arranged in the first display area AA1 in an irregular manner (regular arrangement, e.g., array), so that the problem of diffraction interference in the first display area AA1 may be improved, and the light collection quality of the light receiving unit 2 or the image capturing unit 3 may be further improved.

It is understood that the first electrode and the light-transmitting portion T may be implemented by any combination of the above-described embodiments, and the description thereof is omitted.

Alternatively, the first electrode layer 12a and the second electrode layer 12b may be opaque or transparent metal film layers, for example, the first electrode layer 12a and the second electrode layer 12b are metal silver and magnesium silver alloy layers, respectively, and are not limited herein. In addition, the area of the first electrode layer 12a may be as small as possible to improve the light transmittance of the first display area AA 1.

In some embodiments, the first electrode layers 12a are spaced apart from each other by a first gap S. An orthographic projection of the light-transmitting portion T of the second electrode layer 12b on the substrate 11 covers an orthographic projection of at least a part of the first gap S on the substrate 11. With this arrangement, the light transmittance of the light-transmitting portion T can be further improved, and thus the light transmittance of the first display area AA1 can be improved.

In addition, the light emitting layer 12 further includes a first light emitting structure 12c and a second light emitting structure 12d between the first electrode layer 12a and the second electrode layer 12 b. The first electrode, the first light emitting structure 12c and the corresponding second electrode layer 12b form a first light emitting element 121, and the orthographic projection shape of the first light emitting element 121 on the substrate 11 is, for example, a circular shape. The first electrode, the second light emitting structure 12d and the corresponding second electrode layer 12b form a second light emitting element 122, and an orthographic projection shape of the second light emitting element 122 on the substrate 11 is, for example, a rectangle.

In some embodiments, the first and second

light Emitting structures

12c and 12d may further include a Hole Transport Layer (HTL), an Emitting Layer (EML), and an Electron Transport Layer (ETL). The light-emitting layer is arranged on the hole transport layer, and the electron transport layer is arranged on the light-emitting layer. The first and second

light emitting structures

12c and 12d may further include at least one of a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an Electron Injection Layer (EIL), or an Electron Transport Layer (ETL), according to design requirements.

The first and second

light emitting elements

121 and 122 formed may be classified into a plurality of types according to colors according to the EML emission color. In one example, the first light emitting element 121 includes a first light emitting element 121 emitting red light, a first light emitting element 121 emitting green light, and a first light emitting element 121 emitting blue light, although not limited thereto in other examples.

In some embodiments, the size of the first light emitting structure 12c is smaller than that of the second light emitting structure 12d of the same color, and the light transmittance of the first display area AA1 is improved. Alternatively, the ratio of the size of the first light emitting structure 12c to the size of the second light emitting structure 12d of the same color is 0.25 to 0.6, and the ratio is set to balance the light transmittance and the service life of the first display area AA1, so that the first display area AA1 with sufficient light transmittance and service life is obtained.

In some embodiments, the display panel of the embodiment of the present application further includes a pixel defining layer 16, the pixel defining layer 16 is located between the substrate 11 and the light emitting layer 12, the pixel defining layer 16 includes a plurality of first pixel openings 161 located in the first display area AA1, and at least a portion of the first light emitting element 121 is located in the corresponding first pixel opening 161. I.e., the first light emitting structure 12c is located in the corresponding first pixel opening 161.

Preferably, an orthographic shape of the first pixel opening 161 on the substrate 11 includes at least one of a circle, an ellipse, and a polygon. Alternatively, at least a part of the outer edge of the orthographic projection of the first pixel opening 161 on the substrate 11 is shaped as a curve.

Therefore, the plurality of first light emitting elements 121 may be arranged in the first display area AA1 in an irregular shape (regular shape, e.g., rectangle) or an irregular form (regular arrangement, e.g., array) in the first display area AA1, which is beneficial to improving the problem of diffraction interference of the first display area AA 1.

In addition, the pixel defining layer 16 further includes a plurality of second pixel openings 162 located in the second display area AA2, and at least a portion of the second light emitting element 122 is located in the corresponding second pixel opening 162. That is, the second light emitting structure 12d is located in the corresponding second pixel opening 162. Alternatively, the orthogonal projection shape of the second pixel opening 162 on the substrate 11 is a rectangle, and the plurality of second light emitting elements 122 are arranged in the second display area AA2 in an array.

In some embodiments, the display panel of the embodiment of the present application further includes a first pixel circuit P1, the first pixel circuit P1 is located in the first display area AA1, and the first light emitting element 121 is electrically connected to the first pixel circuit P1 through a via hole; the first pixel circuit P1 and the orthographic projection of the first electrode on the substrate 11 overlap each other. Since the orthographic projections of the first pixel circuit P1 and the first electrode on the substrate 11 overlap each other, the light transmittance and the diffraction interference problem of the first display area AA1 can be improved. It is to be understood that the first light emitting element 121 may be electrically connected to the first pixel circuit P1 by a signal line or other means, which is not limited herein.

As shown in fig. 3 and 6, the display panel further includes a driving array layer 14 and a planarization layer 15. The driving array layer 14 is located between the substrate 11 and the pixel defining layer 16, and the planarization layer 15 is located between the driving array layer 14 and the pixel defining layer 16.

The driving array layer 14 includes a first pixel circuit P1 located in the first display area AA1 and a second pixel circuit P2 located in the second display area AA2, the first light emitting element 121 is electrically connected to the first pixel circuit P1 for driving the first light emitting element 121 to emit light, and the second light emitting element 122 is electrically connected to the second pixel circuit P2 for driving the second light emitting element 122 to emit light.

As shown in fig. 6, a boundary between the first display area AA1 and the second display area AA2 is shown by a dotted line. The driving array layer 14 further includes a semiconductor layer 144, a gate layer 141, a capacitor layer 142, and a source drain layer 143, which are sequentially disposed in a direction away from the substrate 11. The first pixel circuit P1 and the second pixel circuit P2 respectively include a thin film transistor and a capacitor, in this embodiment, the gate layer 141 is a metal conductive layer where a gate of the thin film transistor is located, the capacitor layer 142 is a metal conductive layer where one of substrates of the capacitor is located, and the source and drain layers 143 are metal conductive layers where a source and a drain of the thin film transistor are located. The first pixel circuit P1 and the second pixel circuit P2 respectively include a gate, a source and a drain disposed in the driving array layer 14.

Optionally, the planarization layer 15 further includes a via 151 penetrating through its thickness, the first light emitting element 121 is electrically connected to the first pixel circuit P1 through the via 151, and the second light emitting element 122 is electrically connected to the second pixel circuit P2 through the via 151. Therefore, the first display area AA1 and the second display area AA2 can display information such as images and characters together, and full-screen display is achieved.

In some embodiments, the display panel 1 further includes a buffer layer (not shown) disposed between the substrate 11 and the driving array layer 14. The buffer layer can comprise SiNx and SiOx to form an insulating film layer with good compactness and flatness.

Fig. 7 illustrates a cross-sectional view along the direction D-D of an enlarged structural view of a region B of a display panel according to an alternative embodiment of the present application.

As shown in fig. 7, an alternative embodiment of the present application provides a display panel 1, which is similar to the structure of the display panel shown in fig. 1 to 6, except that the first pixel circuit P1 is located in the second display area AA2, the first light emitting element 121 is electrically connected to the first pixel circuit P1 through a signal line L, and the signal line L is a transparent conductive line at least in the first display area AA 1.

Optionally, the signal lines L include a first signal line located in the first display area AA1 and a second signal line located in the second display area AA2, the first signal line is a transparent conductive line and is made of, for example, Indium Tin Oxide (ITO) to improve light transmittance of the first display area AA1 and improve the problem of diffraction interference of the first display area AA1, and the second signal line may be made of an opaque metal with low resistivity, such as copper, aluminum, or the like.

Optionally, the signal line L is an integral transparent conductive line, so that the signal line L is convenient to manufacture, and the light transmittance of the display panel is improved. Optionally, the signal line L is an integral opaque conductive line and is made of an opaque metal with low resistivity, such as copper, aluminum, and the like, so that the signal line L is convenient to manufacture and the manufacturing cost is reduced.

Fig. 8 is an enlarged schematic structural view illustrating a region B of a display panel according to an alternative embodiment of the present application, fig. 9 is a cross-sectional view of fig. 8 taken along a direction E-E, and fig. 10 is a cross-sectional view illustrating the region B of the display panel according to another alternative embodiment of the present application taken along the direction E-E.

As shown in fig. 8 and 9, an alternative embodiment of the present application provides a display panel 1, which is similar to the structure of the display panel shown in fig. 6 or 7, except that the light transmittance of the first display area AA1 is higher, so as to further improve the light collection quality of the light receiving unit 2 and the image capturing unit 3. For convenience of description, the first pixel circuit P1 is illustrated as being located in the first display area AA 1.

Since the first pixel circuit P1 is located in the first display area AA1, and the orthographic projections of the light-transmitting portion T and the first electrode on the substrate 11 do not overlap with each other, when a large space is formed between the first electrode and the light-transmitting portion T, a through hole H may be formed at the space to improve the light transmittance of the first display area AA 1.

Alternatively, as shown in fig. 9, the planarization layer 15, the pixel defining layer 16, and the second electrode layer 12b of the display panel 1 respectively include a light hole H opened in the first display area AA1, the light hole H and the light hole T do not overlap with each other, and the packaging layer 17 fills the light hole H. Optionally, the light transmittance of the encapsulation layer 17 is greater than at least any one of the light transmittances of the second electrode layer 12b, the planarization layer 15 and the pixel defining layer 16. The shape of the light hole H may be circular, oval, etc., and the penetrating position of the light hole H on the planarization layer 15, the pixel defining layer 16 and the second electrode layer 12b is determined according to specific design and is not limited herein.

The planarization layer 15 and the pixel defining layer 16 are made of transparent organic materials. For example, the material of any one of the planarization layer 15 and the pixel defining layer 16 may be hexamethyldisiloxane, epoxy resin, or Polyimide (PI), or may be another silicon-based material with a light transmittance of 90% or more, or another organic material with a slightly lower light transmittance (greater than 80%) and a slightly higher bending strength.

Further alternatively, since the first pixel circuit P1 is located in the first display area AA1, and the orthographic projections of the first pixel circuit P1 and the first electrode on the substrate 11 overlap with each other, a larger interval is also provided between the first pixel circuits P1 in the first display area AA1, so that a light-transmitting hole H can be opened at the interval, so as to improve the light transmittance of the first display area AA 1.

As shown in fig. 10, at least one of the semiconductor layer 144, the gate layer 141, the capacitor layer 142 and the source/drain layer 143 of the driving array layer 14 further includes a light hole H opened in the first display area AA1, and the packaging layer 17 fills the light hole H. The shape of the light hole H may be circular, oval, etc., and the penetrating position of the light hole H on the driving array layer 14 is determined according to the specific design and is not limited herein.

It is understood that when the first pixel circuit P1 is located in the second display area AA1, if the distance between the first electrode and the light-transmitting portion T is relatively large, the light-transmitting hole H may be formed at the distance, and the light-transmitting hole H may penetrate through the film layers below the encapsulation layer 17 without affecting circuit transmission, and thus, the description is omitted.

In the foregoing embodiments, the second display area AA2 of the display panel is disposed around the first display area AA 1. In other embodiments, there may be other positional relationships between the first display area AA1 and the second display area AA 2.

As shown in fig. 11, another alternative embodiment of the present application further provides a display panel, which is similar to the structure of the display panel shown in fig. 1 to 10, except that the first display area AA1 is disposed on one side edge of the second display area AA2, i.e., the second display area AA2 is disposed around a portion of the first display area AA 1.

As shown in fig. 11, the number of the first display areas AA1 is two, the light receiving unit 2 is disposed corresponding to one of the first display areas AA1, and the image pickup unit 3 is disposed corresponding to the other first display area AA 1. In some embodiments, the number of the first display areas AA1 is one, and the light receiving unit 2 and the image pickup unit 3 are respectively provided corresponding to the first display areas AA 1. In addition, the plurality of light emitting units 131 are arranged in a dot matrix manner on the side of the light emitting layer 12 of the entire display panel 1 away from the substrate 11.

It is understood that the number and the position of the first display areas AA1 may be determined according to the specific design requirements of the light receiving unit 2 and the camera unit 3, and will not be described in detail. In addition, the light emitting units 131 may be arranged in a cross shape, an X shape, or a circular shape on the side of the light emitting layer 12 of the entire display panel 1 away from the substrate 11, which is not described in detail.

In addition, the embodiment of the application also provides a display device which comprises any one of the display panels. The display device may be a cell phone, a tablet computer, a wearable device, or the like.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A display panel, comprising:

a substrate;

a light emitting layer on the substrate;

and the light emitting units are positioned on one side of the light emitting layer, which is far away from the substrate, and are used for emitting detection light to a target object positioned on one side of the light emitting surface of the display panel, wherein the detection light is invisible light which can penetrate through the display panel.

2. The display panel according to claim 1, wherein the light emitting layer includes a plurality of light emitting elements, and an orthogonal projection of the light emitting unit on the substrate and an orthogonal projection of the light emitting elements on the substrate do not overlap each other.

3. The display panel of claim 2, further comprising an encapsulation layer on a side of the light emitting layer facing away from the substrate, wherein the plurality of light emitting units are on a side of the encapsulation layer facing away from the substrate.

4. The display panel according to claim 3, wherein the display panel further comprises a touch layer located on a side of the encapsulation layer facing away from the substrate, the touch layer comprises a plurality of touch electrodes and a plurality of touch leads electrically connected to the plurality of touch electrodes, and an orthographic projection of the light emitting unit on the substrate does not overlap with an orthographic projection of the touch electrode or the touch lead on the substrate.

5. The display panel according to claim 4, wherein the plurality of light emitting units are located on the touch layer.

6. The display panel according to claim 1, wherein the display panel comprises a first display region and a second display region at least partially surrounding the first display region, and wherein the light transmittance of the first display region is greater than the light transmittance of the second display region;

the light-emitting layer comprises a first electrode layer and a second electrode layer, and the second electrode layer is positioned on one side of the first electrode layer, which is far away from the substrate;

the first electrode layer comprises a plurality of first electrodes positioned in the first display area, the second electrode layer comprises a plurality of light-transmitting portions positioned in the first display area, and the orthographic projection of the light-transmitting portions on the substrate and the orthographic projection of the first electrodes on the substrate do not overlap with each other;

preferably, an orthographic projection shape of the first electrode and/or the light-transmitting portion on the substrate includes at least one of a circle, an ellipse, and a polygon;

alternatively, at least a part of an outer edge of an orthographic projection of the first electrode and/or the light-transmitting portion on the substrate is curved.

7. The display panel according to claim 6, wherein the light-emitting element comprises a first light-emitting element in the first display region, the display panel further comprising a pixel defining layer between the substrate and the light-emitting layer, the pixel defining layer comprising a plurality of first pixel openings in the first display region, at least a portion of the first light-emitting element being in the corresponding first pixel opening;

preferably, an orthographic shape of the first pixel opening on the substrate includes at least one of a circle, an ellipse, and a polygon; or at least part of the outer edge of the orthographic projection of the first pixel opening on the substrate is in a curve shape.

8. The display panel according to claim 1, wherein the display panel further comprises a driving array layer, the driving array layer is located between the substrate and the light emitting layer, the driving array layer comprises a first pixel circuit, the first pixel circuit is located in the first display region, and the first light emitting element is electrically connected to the first pixel circuit through a via hole;

the first pixel circuit and the orthographic projection of the first electrode on the substrate are mutually overlapped.

9. The display panel according to claim 1, wherein the display panel further comprises a driving array layer, the driving array layer is located between the substrate and the light emitting layer, the driving array layer comprises a first pixel circuit, the first pixel circuit is located in the second display region, the first light emitting element is electrically connected to the first pixel circuit through a signal line, and the signal line is a transparent conductive line at least in the first display region.

10. A display device, comprising:

the display panel according to any one of claims 1 to 9;

the light receiving unit is positioned on one side of the display panel, which is far away from the light emergent surface, and probe light emitted by the light emitting units of the display panel enters the light receiving unit after being reflected by a target object so that the light receiving unit can acquire depth information of the target object;

and the camera shooting unit is positioned on one side of the display panel, which is deviated from the light emergent surface, and is used for acquiring the image information of the target object, and the display device identifies the target object through the depth information and the image information.