WO2023284734A1

WO2023284734A1 - Display module and electronic device

Info

Publication number: WO2023284734A1
Application number: PCT/CN2022/105181
Authority: WO
Inventors: 宋亚蕾; 陈荣研
Original assignee: 维沃移动通信有限公司
Priority date: 2021-07-15
Filing date: 2022-07-12
Publication date: 2023-01-19
Also published as: CN113486831A

Abstract

The present application relates to the field of communication devices, and discloses a display module and an electronic device. The display module comprises an acoustic-electric conversion layer, a plurality of first electrodes, and a plurality of third electrodes; each first electrode and each third electrode are spaced apart from each other and arranged at the first side of the acoustic-electric conversion layer; a plurality of second electrodes are spaced apart from each other and arranged at the second side of the acoustic-electric conversion layer facing away from the first electrodes; one first electrode or one third electrode directly faces at least two second electrodes; the display module has a touch mode and an ultrasonic mode; in the touch mode, the first electrode is a driving electrode, the third electrode is a receiving electrode, and the first electrode and the third electrode are used for measuring touch capacitance; and in the ultrasonic mode, the first electrode and/or the third electrode provided corresponding to the second electrode is the driving electrode, the second electrode is the receiving electrode, the driving electrode drives the acoustic-electric conversion layer to generate ultrasonic waves, and the receiving electrode receives the reflected ultrasonic waves.

Description

Display Modules and Electronics

cross reference

The present invention claims the priority of a Chinese patent application filed with the China Patent Office on July 15, 2021, with application number 202110799623.X and title of invention "display module and electronic equipment", the entire contents of which are incorporated by reference in In the present invention.

technical field

The application belongs to the technical field of communication equipment, and in particular relates to a display module and electronic equipment.

Background technique

With the development of technology, more and more technologies are applied to electronic devices. For example, compared to previous electronic devices that required a separate arrangement of a fingerprint identification module outside the display screen, a fingerprint identification module has been deployed in the area where the display screen is located in the related art. However, in the current combination scheme of the display screen and the fingerprint identification module, the fingerprint identification module is arranged under the display screen, which leads to a relatively large overall thickness of the electronic device.

Contents of the invention

The purpose of the embodiments of the present application is to provide a display module and an electronic device to solve the problem that the overall thickness of the electronic device is relatively large due to the stacking of the fingerprint identification module and the display screen in the current electronic device.

In order to solve the above-mentioned technical problems, the application is implemented as follows:

In the first aspect, the embodiment of the present application discloses a display module, which includes an acoustic-electric conversion layer, a plurality of first electrodes, and a plurality of third electrodes, wherein,

Each of the first electrodes and each of the third electrodes are arranged at intervals on the first side of the acoustic-electric conversion layer; Two electrodes, one of the first electrodes or one of the third electrodes is opposite to at least two of the second electrodes;

The display module has a touch mode and an ultrasonic mode, wherein,

In the touch mode, the first electrode is a driving electrode, the third electrode is a receiving electrode, and the first electrode and the third electrode are used to detect touch capacitance;

In the ultrasonic mode, the first electrode and/or the third electrode corresponding to the second electrode is a driving electrode, the second electrode is a receiving electrode, and the driving electrode drives the acoustic The electrical conversion layer generates ultrasonic waves, and the receiving electrodes receive reflected ultrasonic waves.

In a second aspect, the embodiment of the present application discloses an electronic device, which includes the above-mentioned display module.

The embodiment of the present application discloses a display module, which includes an acoustic-electric conversion layer, a plurality of first electrodes, and a plurality of third electrodes, the first electrodes and the third electrodes are all arranged on the same side of the acoustic-electric conversion layer, and the acoustic A plurality of second electrodes are provided on the side of the electrical conversion layer away from the first electrode, and one first electrode or one third electrode is opposite to at least two second electrodes. In addition, by using the first electrode and/or the third electrode corresponding to the second electrode in the above display module as a driving electrode, the acoustic-electric conversion layer is driven to generate ultrasonic waves, and the second electrode is used as a receiving electrode for receiving reflected waves. The ultrasonic wave acts on the acoustic-electric conversion layer to make the electrical signal generated by the acoustic-electric conversion layer, so that the display module has an ultrasonic mode, which can provide the fingerprint recognition function for the display module; at the same time, by making the first electrode in the above-mentioned display module The first electrode and the third electrode are used as driving electrodes, and the third electrode is used as a receiving electrode. The first electrode and the third electrode can detect touch capacitance, so that the display module also has a touch mode. Therefore, since the above-mentioned display module has both a touch function and an ultrasonic function, and by reusing the structure that provides the ultrasonic recognition function to provide the touch function, the display module does not need to separately arrange a fingerprint recognition module, thereby enabling The overall thickness of the display module with the fingerprint recognition function is relatively small, and finally the overall thickness of the electronic device is also relatively small.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

FIG. 1 is a schematic cross-sectional structure diagram of a display module disclosed in an embodiment of the present application;

FIG. 2 is another schematic cross-sectional structure diagram of the display module disclosed in the embodiment of the present application;

Fig. 3 is a schematic diagram of the distribution of the first electrode, the second electrode and the third electrode in the display module disclosed in the embodiment of the present application;

FIG. 4 is a schematic diagram of the distribution of the second electrodes in the display module disclosed in the embodiment of the present application;

Fig. 5 is a schematic diagram of the assembly of the first electrode and the third electrode in the display module disclosed in the embodiment of the present application;

Fig. 6 is a schematic cross-sectional view of a part including a bridge structure in a display module disclosed in an embodiment of the present application;

FIG. 7 is a schematic diagram of the working principle of the acoustic wave reflection cavity in the display module disclosed in the embodiment of the present application.

Explanation of reference signs:

100-acoustic-electric conversion layer, 110-sub conversion layer,

310-first electrode, 320-second electrode, 330-third electrode,

500-bridge structure, 510-first conductive part, 520-second conductive part, 530-insulator,

710-middle frame, 720-foam, 730-acoustic reflection cavity.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It should be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application can be practiced in sequences other than those illustrated or described herein, and that references to "first," "second," etc. distinguish Objects are generally of one type, and the number of objects is not limited. For example, there may be one or more first objects. In addition, "and/or" in the description and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

The folding mechanism and the electronic device provided by the embodiments of the present application will be described in detail below through specific embodiments and application scenarios with reference to the accompanying drawings.

As shown in FIG. 1 to FIG. 7 , the embodiment of the present application discloses a display module, which can be applied in electronic equipment, which includes an acoustic-electric conversion layer 100, a plurality of first electrodes 310 and a plurality of third electrodes 310 electrode 330 . In addition, components such as foam 720 may be arranged on the outside of the display module to provide vibration reduction for the entire display module and improve the reliability of the display module.

Wherein, the acoustic-electric conversion layer 100 is made of materials capable of converting acoustic signals and electrical signals, and its thickness and other dimensions can be determined according to actual requirements. Optionally, the acoustic-electric conversion layer 100 is made of piezoelectric material, and when the acoustic-electric conversion layer 100 is subjected to an electric signal, it can generate sound waves through the inverse piezoelectric effect, and correspondingly, when the acoustic-electric conversion layer 100 is subjected to the action of the acoustic wave When impacted, it can generate electrical signals through the positive piezoelectric effect, thereby realizing mutual conversion between sound signals and electrical signals. Of course, the acoustic-electric conversion layer 100 can also be formed by other materials having the above-mentioned capabilities, which will not be listed here.

Each first electrode 310 and each third electrode 330 are arranged on the first side of the acoustic-electric conversion layer 100, and each first electrode 310 is spaced from each other, and each third electrode 330 is spaced from each other, correspondingly, adjacent The first electrodes 310 and the third electrodes 330 are also spaced apart from each other, so that any adjacent two first electrodes 310 are insulated from each other, and any adjacent two third electrodes 330 are also insulated from each other, and Any adjacent first electrodes 310 and third electrodes 330 are insulated from each other to ensure that each first electrode 310 and each third electrode 330 can work independently. Correspondingly, in the wiring process, it is also necessary to connect each first electrode 310 and each third electrode 330 to an independent cable to ensure that the first electrode 310 and the third electrode 330 are insulated from each other, so that the first electrode 310 and the third electrode 330 conform to the above structure. The electrodes 310 and the third electrodes 330 can form a touch unit, so as to provide a touch function for the display module by means of the first electrodes 310 and the third electrodes 330 .

Specifically, the shape and size of the first electrode 310 and the third electrode 330 can be determined according to actual requirements, which are not limited here. Both the first electrode 310 and the third electrode 330 can be fixedly connected to the first side of the acoustic-electric conversion layer 100 by means of conductive adhesive bonding, so as to ensure the connection between the first electrode 310 and the third electrode 330 and the acoustic-electric conversion layer 100 The connection reliability is relatively high, and both the first electrode 310 and the third electrode 330 can transmit electrical signals to the acoustic-electric conversion layer 100 . In addition, in order to ensure that the first electrode 310 and the third electrode 330 can form a touch control unit, it is also necessary to make the electrical connection between the first electrode 310 and the third electrode 330 The directions are perpendicular to each other, and by setting the first electrode 310 and the third electrode 330 on the same side of the acoustic-electric conversion layer 100, it can be ensured that the first electrode 310 and the third electrode 330 will not overlap each other, which makes the first The electrodes 310 and the third electrodes 330 are provided as the basis of the touch control unit, so that when both are powered on, when the user touches the display module, the capacitance between the corresponding first electrodes 310 and the third electrodes 330 can be made The position where the capacitance changes can be detected by means of a detection circuit and other devices, so as to realize the purpose of identifying the touch position.

In order to make the display module also have the ability of ultrasonic recognition, the second side of the acoustic-electric conversion layer 100 away from the first electrode 310 is also provided with a plurality of second electrodes 320, and the plurality of second electrodes 320 are spaced apart from each other, so that the second electrodes 320 are insulated from each other to ensure that each second electrode 320 can independently output electrical signals. During the process of arranging the second electrodes 320 , one first electrode 310 or one third electrode 330 may be directly opposed to at least two second electrodes 320 . That is to say, at least two second electrodes 320 form a group, and the group of second electrodes 320 as a whole is either arranged opposite to one first electrode 310 or arranged opposite to one third electrode 330 . Optionally, among the two types of electrodes, the first electrode 310 and the third electrode 330, the second electrode 320 can be only the first electrode 310, or only the third electrode 330. In other words, at least two second electrodes 320 are divided into at least one group, and the second electrodes 320 of all groups can be respectively set corresponding to the first electrodes 310, or the second electrodes 320 of all groups can be They may be respectively arranged corresponding to the third electrodes 330 . In another embodiment of the present application, the plurality of second electrodes 320 can be divided into multiple groups, and at least one group of second electrodes 320 is set corresponding to the first electrodes 310, so that at least one group of second electrodes 320 and The third electrode 330 is provided correspondingly. Of course, the number of second electrodes 320 in each group can be the same or different.

By disposing the above-mentioned second electrode 320 on the second side of the acoustic-electric conversion layer 100, electrodes are provided on opposite sides of the acoustic-electric conversion layer 100, which makes the first electrode 310 located on the first side of the acoustic-electric conversion layer 100 and the third electrode 330 can both be used as driving electrodes to output electrical signals to the acoustic-electric conversion layer 100, so that the acoustic-electric conversion layer 100 vibrates to generate sound waves, while the second electrode 320 on the second side can be used as a receiving electrode to Receiving the reflected sound waves acting on the acoustic-electric conversion layer 100 causes the electrical signal generated by the acoustic-electric conversion layer 100 , so that the display module has the capability of ultrasonic recognition. Of course, in the process of ultrasonic recognition by the display module, it is usually necessary to use other devices to detect the specific parameters of the electrical signal received by the receiving electrode. Different energy, and then different reflected waves make the voltage of the electrical signal generated by the acoustic-electric conversion layer 100 also different, so that detection is performed based on the voltage of the electrical signal received by different second electrodes 320, so that the display module also has the function of ultrasonic recognition. ability.

Based on the above display module, it has a touch mode and an ultrasonic mode, wherein,

In the touch mode, the first electrode 310 is a driving electrode, and the third electrode 330 is a receiving electrode, and the first electrode 310 and the third electrode 330 can detect touch capacitance. As mentioned above, the first electrode 310 and the third electrode 330 are insulated from each other, and the electrical connection directions of the two are perpendicular to each other. In this case, by making the first electrode 310 a driving electrode, the third electrode 330 is a receiving electrode. electrodes, and each second electrode 320 is suspended in the air or at a certain voltage, so that when a living body touches the display module, the capacitance between the first electrode 310 and the third electrode 330 can change, and the function of the detection circuit In this way, the specific position where the capacitance changes in the display module can be obtained, and the detection and identification of the touch position can be realized.

In the ultrasonic mode, the first electrode 310 and/or the third electrode 330 correspondingly provided with the second electrode 320 is a driving electrode, and the second electrode 320 is a receiving electrode. Specifically, as mentioned above, the second electrode 320 can only be provided corresponding to the first electrode 310 (or the third electrode 330), or the first electrode 310 and the third electrode 330 can be provided with the second electrode 320 correspondingly. . In this mode, only the first electrodes 310 and/or the third electrodes 330 corresponding to the second electrodes 320 are used as driving electrodes, so that the second electrodes 320 as receiving electrodes can receive corresponding electrical signals. Therefore, in this embodiment, if a first electrode 310 (or third electrode 330) is not provided with a corresponding second electrode 320, the first electrode 310 (or third electrode 330) may not be used as a driving electrode, On the one hand, it can save power, and on the other hand, it can also prevent the first electrode 310 (or the third electrode 330) that does not correspond to the second electrode 320 from working as a driving electrode, which affects the receiving accuracy of the second electrode 320 as a receiving electrode. produce adverse effects.

In the ultrasonic mode, the driving electrodes can drive the acoustic-electric conversion layer 100 to generate ultrasonic waves when they are powered on. The ultrasonic waves generated by the acoustic-electric conversion layer 100 are emitted and then reflected by objects or living bodies. The reflected ultrasonic waves act on the acoustic wave. on the electric conversion layer 100, so that the corresponding area on the acoustic-electric conversion layer 100 generates electrical signals, and correspondingly, the second electrode 320 as a receiving electrode can receive the electrical signals generated by the acoustic-electric conversion layer 100, so that the display module has ultrasonic model. Moreover, as mentioned above, by using other devices such as a detection circuit, the electrical signals received by each of the plurality of second electrodes 320 can be identified respectively, so as to achieve the purpose of ultrasonic identification.

The embodiment of the present application discloses a display module, which includes an acoustic-electric conversion layer 100, a plurality of first electrodes 310 and a plurality of third electrodes 330, and the first electrodes 310 and the third electrodes 330 are both arranged on the acoustic-electric conversion layer 100. On the same side of the acoustic-electric conversion layer 100 , a plurality of second electrodes 320 are provided on the side away from the first electrode 310 , and one first electrode 310 or one third electrode 330 is opposite to at least two second electrodes 320 . Moreover, by making the first electrode 310 and/or the third electrode 330 correspondingly provided with the second electrode 320 in the above-mentioned display module be a driving electrode, the acoustic-electric conversion layer 100 is driven to generate ultrasonic waves, and the second electrode 320 is a receiving electrode , to receive the reflected ultrasonic wave acting on the acoustic-electric conversion layer 100 to cause the electrical signal generated by the acoustic-electric conversion layer 100, so that the display module has an ultrasonic mode, which can provide a fingerprint identification function for the display module; at the same time, by making the above-mentioned display The first electrode 310 in the module is a driving electrode, and the third electrode 330 is a receiving electrode. The first electrode 310 and the third electrode 330 can detect touch capacitance, so that the display module also has a touch mode. Therefore, since the above-mentioned display module has both a touch function and an ultrasonic function, and by reusing the structure that provides the ultrasonic recognition function to provide the touch function, the display module does not need to separately arrange a fingerprint recognition module, thereby enabling The overall thickness of the display module with the fingerprint recognition function is relatively small, and finally the overall thickness of the electronic device is also relatively small.

As mentioned above, the display module can be applied in electronic equipment. During the process of installing the display module, the display can be installed on the middle frame 710 of the electronic device. The middle frame 710 is used to carry the inner frame of the electronic device The installation infrastructure of devices, such as batteries and chips of electronic equipment, can be supported and installed on the middle frame 710 . Correspondingly, the display module can also be carried on the middle frame 710, so as to ensure that the display module has high installation stability. Optionally, the display module is attached to the middle frame 710, in this case, the installation stability of the display module can be improved to a certain extent. In addition, when the above technical solution is adopted, materials such as foam can be arranged between the display module and the middle frame 710, so as to provide a certain avoidance space for the vibration of the acoustic-electric conversion layer 100 through the material such as foam, so as to ensure that the acoustic-electric conversion The layer 100 will not have adverse effects on other components in the display module during the process of energizing and vibrating.

In another embodiment of the present application, a certain gap can be formed between the display module and the middle frame 710, so as to use the gap to form a sound wave reflection cavity 730, and the size of the sound wave reflection cavity 730 in the thickness direction of the display module It can be determined according to the actual situation, and there is no limitation here, and the size of any position of the sound wave reflection cavity 730 in the thickness direction of the display module can be basically the same as far as possible, so as to ensure the reflection of the ultrasonic waves generated everywhere on the acoustic-electric conversion layer 100 It is basically the same, reducing the difficulty of the ultrasonic recognition process, thereby improving the accuracy of the ultrasonic recognition work.

Specifically, the first electrode 310 and the third electrode 330 can be arranged between the acoustic-electric conversion layer 100 and the middle frame 710, and correspondingly, the second electrode 320 is arranged on a side of the acoustic-electric conversion layer 100 away from the middle frame 710. In this case, along the thickness direction of the acoustic-electric conversion layer 100 , the first electrode 310 and the third electrode 330 and the middle frame 710 form the above-mentioned acoustic wave reflection cavity 730 .

By forming the acoustic wave reflection cavity 730 between the display module and the middle frame 710 , the acoustic-electric conversion layer 100 has a certain vibration space, thereby improving the reliability of the acoustic-electric conversion layer 100 . Moreover, since the electrical signal sent by the driving electrodes is a pulse signal, the emission direction of the ultrasonic wave generated by the acoustic-electric conversion layer 100 also includes two opposite directions, namely, the first direction toward the display surface of the display module and the first direction away from the display module. The second orientation of the display surface. Wherein, the ultrasonic wave propagating along the first direction can directly shoot toward the direction where the display surface is located, while the ultrasonic wave propagating along the second direction may not reach the display surface. By setting the acoustic wave reflection cavity 730 between the display module and the middle frame 710, the part of the sound wave generated by the acoustic-electric conversion layer 100 along the second direction and propagating in the direction close to the middle frame 710 can also be in the sound wave reflection cavity 730. Reflection occurs on the surface of the middle frame 710, and finally shoots toward the direction where the display surface of the display module is located. Furthermore, by adopting the above technical solution, it is possible to increase the amount of reflection of ultrasonic waves in the ultrasonic mode, thereby increasing the amount of electrical signals that can be received by the receiving electrodes, and finally achieve the purpose of improving the accuracy of ultrasonic recognition.

Of course, in the case where the acoustic wave reflection cavity 730 is provided between the display module and the middle frame 710, it is also necessary to provide a support structure between the two, which can be distributed in multiple positions between the display module and the middle frame 710. A plurality of supporting blocks and other supporting structures are arranged in an efficient manner, so as to provide a more reliable supporting function for the display module under the condition that the coverage area of the acoustic wave reflecting cavity 730 is affected as little as possible. Optionally, the aforementioned supporting structure may be a part included in the display module, or a part outside the display module.

As mentioned above, both the first electrodes 310 and the third electrodes 330 are disposed on the same side of the acoustic-electric conversion layer 100 , and the plurality of first electrodes 310 are spaced apart from each other, and the plurality of third electrodes 330 are spaced apart from each other. Optionally, in the process of arranging the first electrodes 310 and the third electrodes 330, the first electrodes 310 and the third electrodes 330 may be arranged alternately. More specifically, the shapes of the first electrode 310 and the third electrode 330 can be circular, which can ensure that the first electrode 310 and the third electrode 330 have mutually perpendicular electrical connection directions. In another embodiment of the present application, both the first electrode 310 and the third electrode 330 are squares with equal dimensions. In this case, the gap between the first electrode 310 and the third electrode 330 can be relatively small, so that the touch accuracy of the display module can be improved. Moreover, in the above-mentioned embodiment, by connecting the opposite corners of two adjacent first electrodes 310 to each other, and connecting the opposite corners of two adjacent third electrodes 330 to each other, the first electrode can be realized. 310 and the third electrode 330 are electrically connected in directions perpendicular to each other.

Optionally, the display module may include an insulating member 530, and any adjacent two first electrodes 310 are connected through a first conductive member 510, and any adjacent two third electrodes 330 are connected through a second conductive member. The second conductive member 520 is located on one side of the first conductive member 510 , and both the third electrode 330 and the second conductive member 520 are insulated from the first conductive member 510 by the insulating member 530 .

Specifically, both the first conductive member 510 and the second conductive member 520 can be wires, and in the process of forming and connecting the first electrode 310 and the third electrode 330, each first electrode 310 and the third electrode 330 can be It is a separate metal block, and then, a plurality of first electrodes 310 in the same row can be connected together by wires, and correspondingly, other wires can be used to connect the third electrodes 330 in the same column together, so that the first The electrical connection direction of the electrodes 310 and the third electrodes 330 is vertical, and then the multiple first electrodes 310 and the multiple third electrodes 330 can be bonded together on the same side of the acoustic-electric conversion layer 100 by means of conductive glue. Certainly, in order to ensure that the first electrode 310 and the third electrode 330 can be insulated from each other, an insulating member 530 may be provided between the wire connecting the first electrode 310 and the wire connecting the third electrode 330 , and the insulating member 530 may include air. In order to further improve the insulating effect between the two, the insulating member 530 may be a structure made of insulating materials such as foam or plastic. In the above embodiment, the wires connected to the first electrode 310 and the wires connected to the third electrode 330, as well as the insulator 530 between the two can be accommodated in adjacent first electrodes 310 and third electrodes 330. In the space formed by the space between them, the second conductive element 520 is located at one side of the first conductive element 510 .

In another embodiment of the present application, in order to reduce the processing difficulty of the first electrode 310 and the third electrode 330 and improve the processing efficiency, optionally, the first electrode 310 and the third electrode 330 can adopt a monolithic metal structure through Segmentation is formed, and in the process of division, a portion between any two adjacent first electrodes 310 is reserved, so as to use this portion as the first conductive member 510 connecting the two adjacent first electrodes 310 . In this case, along the thickness direction of the acoustic-electric conversion layer 100 , the size of the first conductive member 510 is equal to the size of the first electrode 310 . Obviously, since any one of the first conductive members 510 is located between two adjacent first electrodes 310, the two adjacent first electrodes 310 in the structure formed by division are in the state of being connected to each other. The process of connecting the first electrodes 310, on the other hand, also reduces the workload of the division work.

Meanwhile, in the above-mentioned embodiment, the purpose of connecting two adjacent third electrodes 330 can be achieved by additionally arranging the second conductive member 520 . While connecting the two third electrodes 330 through the second conductive member 520, in order to ensure that the third electrode 330 and the first electrode 310 can still be insulated from each other, the second conductive member 520 can be arranged on the first electrode 310 away from the acoustic-electric conversion layer. One side of 100 , that is, the second conductive member 520 is located outside the space between two adjacent third electrodes 330 . Moreover, as mentioned above, the display module may include an insulating member 530, and further, the third electrode 330 and the second conductive member 520 may be insulated from the first conductive member 510 through the insulating member 530, so that the adjacent third electrode 330 While the electrical connection relationship can be formed through the second conductive member 520 , it can also ensure that the insulation relationship between the third electrode 330 and the first electrode 310 will not be damaged.

Specifically, any second conductive member 520 can be fixed and electrically connected between two adjacent third electrodes 330 by means of welding or the like. Of course, the second conductive member 520 may also be bonded and fixed between two adjacent third electrodes 330 by means of conductive adhesive bonding. The insulating member 530 can be a plastic block, which can be placed between the first conductive member 510 and the second conductive member 520 , so as to ensure that the first conductive member 510 and the second conductive member 520 can be insulated from each other. Further, a receiving groove can be provided in the middle of the insulating member 530, and the first conductive member 510 can be accommodated in the receiving groove of the insulating member 530, so that a part of the insulating member 530 can also be sandwiched between adjacent third electrodes 330, so as to improve the insulation reliability between the third electrode 330 and the first electrode 310, and at the same time, not affect the connection relationship between the first electrodes 310.

In addition, when the dimensions of the first conductive member 510 and the first electrode 310 in the thickness direction of the acoustic-electric conversion layer 100 are equal, an escape groove can be provided on the second conductive member 520 , and one end of the insulating member 530 faces The side of the first electrode 310 facing away from the acoustic-electric conversion layer 100 protrudes to separate the first conductive member 510 from the second conductive member 520 by the end of the insulating member 530 . Moreover, the protruding part of the insulator 530 can be extended into the avoidance groove, so that the insulator 530 can be supported on the second conductive member 520 , and the installation stability of the insulator 530 can be improved. In this embodiment, the first conductive element 510 , the second conductive element 520 and the insulating element 530 together form the bridging structure 500 .

As mentioned above, the display module can be applied in an electronic device, and the display module can be supported on the middle frame 710 of the electronic device. In the above embodiment, the end of the second conductive member 520 facing away from the acoustic-electric conversion layer 100 can be made It abuts against the middle frame 710, and since the second conductive member 520 functions to connect two adjacent third electrodes 330, the size of the second conductive member 520 can usually be relatively small, so that any third electrode 330 The side away from the acoustic-electric conversion layer 100 still has a larger area not covered by the second conductive member 520, and since the space on the side of the first electrode 310 away from the acoustic-electric conversion layer 100 must not be covered by the second conductive member 520 cover, so that the first electrode 310 and the third electrode 330 can form an acoustic wave reflection cavity 730 with the middle frame 710, and the size of the acoustic wave reflection cavity 730 along the thickness direction of the acoustic-electric conversion layer 100 can be determined according to actual needs, and by adjusting the second The thickness of the corresponding portion of the conductive member 520 can change the size of the acoustic wave reflection cavity 730 in the corresponding direction.

By forming the acoustic wave reflection cavity 730 , a certain escape space can be provided for the vibration action of the acoustic-electric conversion layer 100 , thereby improving the reliability of the acoustic-electric conversion layer 100 . In addition, the acoustic wave generated by the acoustic-electric conversion layer 100 can be made to travel away from the display surface, that is, the part that propagates in the direction close to the middle frame 710 can be reflected on the surface of the middle frame 710 in the acoustic wave reflection cavity 730, and radiate toward the center away from the display surface. The direction of frame 710 is the direction where the display surface of the display module is located. Furthermore, by adopting the above technical solution, it is possible to increase the amount of reflection of ultrasonic waves in the ultrasonic mode, thereby increasing the amount of electrical signals that can be received by the receiving electrodes, and finally achieve the purpose of improving the accuracy of ultrasonic recognition. In addition, the above-mentioned sound wave reflection cavity 730 is formed by means of the second conductive member 520, so that the second conductive member 520 can provide stable support for the display module, so that no additional structures are required to provide support for the display module, reducing the display The design and processing difficulty of the module.

As mentioned above, one or several of the first electrodes 310 can be independently provided with the second electrodes 320 respectively, and one or several of the third electrodes 330 can be separately provided with the second electrodes 320 respectively. , one or more of the first electrodes 310 and one or more of the third electrodes 330 can also be respectively provided with the second electrodes 320 correspondingly. In order to improve space utilization, optionally, any first electrode 310 and any third electrode 330 may be provided with at least two second electrodes 320 correspondingly along the thickness direction of the acoustic-electric conversion layer 100 . In the case of adopting this technical solution, the display module also has the function of full-screen identification, that is, the user can perform fingerprint identification at any position on the display module, which can greatly improve the convenience of fingerprint identification. Thereby improving user experience.

In addition, at least two second electrodes 320 corresponding to the first electrode 310 and/or corresponding to the third electrode 330 can be arranged in a determinant to improve space utilization, and to a certain extent improve the 310 (or the third electrode 330 ) of at least two second electrodes 320 receiving performance of ultrasonic waves. Specifically, in the case where the first electrodes 310 and the third electrodes 330 are both square structures, each second electrode 320 can also be a square structure, and at least The two second electrodes 320 are arranged in a determinant manner.

Compared with the relatively low pulse frequency and pulse amplitude in the touch mode, the frequency of the pulse signal sent by the driving electrodes in the ultrasonic mode is relatively high, and the pulse amplitude is relatively large, and the power consumption of the ultrasonic mode is also relatively low. Relatively high, so in order to reduce the power consumption of the display module, when the display module works in the setting scene, it can first make the display module work in touch mode, and then the display module works in touch mode, and When it is detected that a living body such as a user's finger is approaching or touching the display module through the capacitance change, the display module can be switched to an ultrasonic mode to ensure that the user can use the display module for fingerprint identification. Wherein, the above-mentioned setting scene can specifically be a lock screen interface and a payment confirmation interface, etc. Those skilled in the art can also assign values to the setting scene according to the actual situation of the electronic device, so as to expand the application range of the above-mentioned control mode, and further reduce the Displays the power consumption of the module.

As mentioned above, in the above embodiments, any position in the display module has the capability of ultrasonic recognition, in this case, the power consumption of the display module may be further aggravated. Based on the above embodiments, the display module can also be made to work in the touch mode first when working in the above-mentioned setting scene, and then switch to the ultrasonic mode for fingerprint recognition when a living body approaches or touches the display module.

Further, by making the display module work in the touch mode, it is also possible to detect the area that the living body may touch. Ultrasonic mode, and for areas that are unlikely to be touched by living bodies, it can still keep working in touch mode, thereby further reducing the power consumption of the display module.

As mentioned above, in the process of arranging the second electrodes 320, optionally, the number of the second electrodes 320 corresponding to different first electrodes 310 (or third electrodes 330) may be the same or different, and multiple Parameters such as arrangement and spacing of the second electrodes 320 may also be the same or different. In a specific embodiment of the present application, the shape and size of each second electrode 320 can be made the same, and the number of any group of second electrodes 320 opposite to the first electrode 310 (and/or third electrode 330) are equal, so that any group of second electrodes 320 is arranged in a determinant. Further, along the thickness direction of the acoustic-electric conversion layer 100: the projections of the outer contours of any first electrode 310 and the outer contours of the plurality of second electrodes 320 corresponding to the first electrode 310 can be overlapped, And/or the projection of the outer contour of any third electrode 330 coincides with the figure enclosed by the outer contours of the plurality of second electrodes 320 corresponding to the third electrode 330 .

In the case of adopting the above-mentioned technical solution, when the ultrasonic wave emitted from any position in the area of the acoustic-electric conversion layer 100 corresponding to the first electrode 310 and/or the third electrode 330 is reflected and acts on the acoustic-electric conversion layer 100 again, it can basically It is ensured that the electrical signals generated at the corresponding positions of the acoustic-electric conversion layer 100 can be received by the second electrodes 320 arranged at the corresponding positions, which can increase the space utilization rate of the display module and maximize the performance of the second electrodes 320. Receiving range, thereby improving the accuracy of fingerprint recognition. Of course, it should be noted that the electric signal generated when the sound wave emitted from the area corresponding to the gap between the second electrodes 320 in the acoustic-electric conversion layer 100 acts on the corresponding position of the acoustic-electric conversion layer 100 after being reflected may not be detected. Received by the second electrode 320 . However, in the actual application process, the gap between adjacent second electrodes 320 is relatively small, and by calculating the specific parameters of the electrical signals received by two adjacent second electrodes 320, with the help of corresponding The algorithm compensates the theoretical parameters of the electrical signal in the area between the second electrodes 320, improving the accuracy of fingerprint identification.

As mentioned above, in the ultrasonic mode, the first electrode 310 and/or the third electrode 330 corresponding to the second electrode 320 are used as driving electrodes to send electrical signals to the corresponding area of the acoustic-electric conversion layer 100, so that the acoustic-electric Corresponding regions in the conversion layer 100 vibrate to convert electrical signals into sound signals. In order to make the parts corresponding to different driving electrodes independent of each other during the vibration of the acoustic-electric conversion layer 100, optionally, the acoustic-electric conversion layer 100 includes a plurality of sub-transformation layers 110, and any first electrode 310 and any third electrode 330 corresponds to one sub-conversion layer 110 one by one. In this case, the sub-conversion layers 110 are independent of each other, so that the vibration process of the sub-conversion layers 110 will basically not interfere with each other, and further improve the working reliability of the entire acoustic-electric conversion layer 100 .

Specifically, the actual size of the sub-switching layer 110 may correspond to the size of its corresponding electrodes (including the first electrode 310 and the third electrode 330 ). Further, the size of the sub-conversion layer 110 can be made slightly larger than the size of the corresponding electrode. Specifically, along the thickness direction of the acoustic-electric conversion layer 100, the projection of any sub-conversion layer 110 corresponding to the first electrode 310 can be made The edge is located outside the first electrode 310, and the edge of the projection of any sub-conversion layer 110 corresponding to the third electrode 330 is located outside the third electrode 330, which enables the sub-conversion layer 110 corresponding to the first electrode 310 to be cover the first electrode 310, and enable the sub-conversion layer 110 corresponding to the third electrode 330 to cover the third electrode 330, thereby ensuring that the output voltage at any position of the first electrode 310 and/or the third electrode 330 as the driving electrode All the signals can act on the corresponding sub-conversion layer 110, and cause the sub-conversion layer 110 to vibrate and emit a sound signal, which expands the fingerprint identification range to a certain extent, thereby improving the fingerprint identification accuracy.

Based on the display module disclosed in any of the above-mentioned embodiments, the present application also discloses an electronic device, which includes any of the above-mentioned display modules. Of course, the electronic device may also include components such as a casing and a battery. Considering the brevity of the text, I won't introduce them one by one here.

The electronic device disclosed in the embodiment of the present application may be a mobile phone, a computer, an e-book reader, a wearable device, etc., and the embodiment of the present application does not limit the specific type of the electronic device.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

Claims

A display module, including an acoustic-electric conversion layer, a plurality of first electrodes, and a plurality of third electrodes, wherein,

Each of the first electrodes and each of the third electrodes are arranged at intervals on the first side of the acoustic-electric conversion layer; Two electrodes, one of the first electrodes or one of the third electrodes is opposite to at least two of the second electrodes;

The display module has a touch mode and an ultrasonic mode, wherein,

In the touch mode, the first electrode is a driving electrode, the third electrode is a receiving electrode, and the first electrode and the third electrode are used to detect touch capacitance;

In the ultrasonic mode, the first electrode and/or the third electrode corresponding to the second electrode is a driving electrode, the second electrode is a receiving electrode, and the driving electrode drives the acoustic The electrical conversion layer generates ultrasonic waves, and the receiving electrodes receive reflected ultrasonic waves.
The display module according to claim 1, wherein the display module is mounted on the middle frame of the electronic device, and along the thickness direction of the acoustic-electric conversion layer, the first electrode and the third electrode are connected to the The middle frame forms an acoustic wave reflection cavity.
The display module according to claim 1, wherein the display module includes an insulating member, any adjacent two of the first electrodes are connected through a first conductive member, and any adjacent two of the first electrodes The third electrodes are connected through a second conductive part, the second conductive part is located on one side of the first conductive part, and the third electrode and the second conductive part are connected to the insulating part through the insulating part. The first conductive member is insulated.
The display module according to claim 3, wherein, along the thickness direction of the acoustic-electric conversion layer, the size of the first conductive member is equal to the size of the first electrode, and the second conductive member is located at the The first electrode is away from the side of the acoustic-electric conversion layer, the second conductive member is provided with an escape groove, and one end of the insulating member protrudes toward the side of the first electrode away from the acoustic-electric conversion layer , and accommodated in the escape groove.
The display module according to claim 4, wherein the display module is mounted on a middle frame of an electronic device, and the end of the second conductive member away from the acoustic-electric conversion layer abuts against the middle frame, and The first electrode, the third electrode and the middle frame form an acoustic wave reflection cavity.
The display module according to claim 1, wherein, along the thickness direction of the acoustic-electric conversion layer, any of the first electrodes and any of the third electrodes are correspondingly provided with at least two of the second electrodes. electrode.
The display module according to claim 1, wherein, along the thickness direction of the acoustic-electric conversion layer:

The outer contour of any one of the first electrodes coincides with the projection of the figure enclosed by the outer contours of at least two second electrodes corresponding to the first electrode;

And/or, the outer contour of any third electrode coincides with the projection of the figure enclosed by the outer contours of at least two second electrodes corresponding to the third electrode.
The display module according to claim 1, wherein the acoustic-electric conversion layer includes a plurality of sub-conversion layers, and any one of the first electrodes and any one of the third electrodes corresponds to one of the sub-conversion layers. layer.
The display module according to claim 8, wherein, along the thickness direction of the acoustic-electric conversion layer, any projection edge of the sub-conversion layer corresponding to the first electrode is located between the first electrodes outside, and any edge of the projection of the sub-converting layer corresponding to the third electrode is located outside the third electrode.
An electronic device, comprising the display module according to any one of claims 1-9.