CN110046556B - Display panel and terminal device thereof - Google Patents
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- CN110046556B CN110046556B CN201910235753.3A CN201910235753A CN110046556B CN 110046556 B CN110046556 B CN 110046556B CN 201910235753 A CN201910235753 A CN 201910235753A CN 110046556 B CN110046556 B CN 110046556B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Human Computer Interaction (AREA)
- General Engineering & Computer Science (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Multimedia (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention provides a display panel, which comprises an array substrate; the array substrate is provided with a TFT circuit layer and a piezoelectric film layer arranged on the TFT circuit layer. The piezoelectric film layer is electrically connected with the TFT circuit layer and can transmit an ultrasonic signal according to a received voltage signal output by the TFT circuit layer, the transmitted ultrasonic signal is reflected back by a face to be recognized and received by the piezoelectric film layer, and the piezoelectric film layer converts the received ultrasonic signal into a voltage signal and transmits the voltage signal to the TFT circuit layer; and the TFT circuit layer processes the received voltage signal containing the human face characteristic information to be recognized and then outputs the processed data information. The invention provides a display panel, which utilizes the structure of the display panel and introduces an ultrasonic functional unit, thereby expanding the functions of the display panel, improving the functional integration level of the display panel and further expanding the application range of the display panel.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a display panel with a face recognition function and a terminal device with the face recognition function.
Background
As is known, the face recognition technology has been widely used in various fields such as identity authentication, for example, to improve the security of electronic products such as smart phones, computer terminals, smart tablets, and door control systems. Compared with the traditional digital password, the face recognition method based on the face recognition brings much convenience and guarantee to the life of people due to the rapidity and the safety of the face recognition.
The initial face recognition is 2D face recognition based on a single camera, and the 2D face recognition is easy to crack due to low safety in the subsequent use process. The industry subsequently adds depth feature point measurement on the basis of 2D face recognition, and develops a 3D face recognition technology.
The 3D face recognition technology mainly depends on a double-camera technology similar to human eyes, and meanwhile, an infrared sensor is additionally arranged to assist in calculating the face depth. Therefore, the safety and the reliability of identification are improved to a certain extent.
However, since the 3D face recognition technology involves many functional devices and needs to be disposed on the front surface of the electronic device for face recognition, the aesthetic property of the front surface of the electronic device is damaged, and the increase of the functional devices also increases the process complexity and difficulty of the whole product process. Therefore, the cost of the product is improved to a certain extent, and the large-scale popularization and application of the product are not facilitated.
Therefore, a novel face equipment searching method becomes a common pursuit in science and engineering, and ultrasonic face recognition provides a good solution.
Disclosure of Invention
One aspect of the present invention is to provide a display panel, which incorporates a face recognition function unit in combination with its own structure, thereby expanding its own functions, improving its function integration level, and further expanding its application range.
The technical scheme adopted by the invention is as follows:
a display panel comprises an array substrate, wherein a TFT circuit layer and a piezoelectric thin film layer arranged on the TFT circuit layer are arranged in the array substrate. The piezoelectric film layer is electrically connected with the TFT circuit layer and can transmit an ultrasonic signal according to a received voltage signal output by the TFT circuit layer, the transmitted ultrasonic signal is reflected back by a face to be recognized and received by the piezoelectric film layer, and the piezoelectric film layer converts the received ultrasonic signal into a voltage signal and transmits the voltage signal to the TFT circuit layer; and the TFT circuit layer processes the received voltage signal containing the human face characteristic information to be recognized and then outputs the processed data information.
The data information containing the face information to be recognized after being processed by the TFT circuit layer can be transmitted to an external data processing unit, the data processing unit processes the received data information and obtains the face feature information to be recognized contained in the data information, and the face feature information is compared with the preset stored face information so as to realize the face recognition function; or the recognized face information is stored in a storage unit of the external equipment.
Further, in various embodiments, the frequency of the ultrasonic waves emitted by the piezoelectric film layer is in the range of 25kHz to 100 kHz.
Further, in various embodiments, a protective layer is further disposed on the piezoelectric thin film layer.
Further, in various embodiments, wherein the protective layer is an acoustic coupling layer.
Further, in various embodiments, the material used for the protective layer includes at least one of polyethylene, polyurethane, polystyrene, rubber, and nylon.
Further, in various embodiments, the material used for the protective layer includes at least two materials selected from polyethylene, polyurethane, polystyrene, rubber, and nylon.
Further, in various embodiments, the piezoelectric thin film layer and the protective layer are spatially separated from each other.
Further, in different embodiments, the piezoelectric film layer and the protective layer are connected by arranging a connecting blind hole.
Further, in various embodiments, wherein the connection blind hole is a vacuum.
Further, in various embodiments, the connecting blind hole is filled with a mixture of two or more of polyethylene, polyurethane, polystyrene, rubber, nylon and other polymer materials.
Further, in a different embodiment, wherein the display panel defines an edge region where image display is not possible, wherein the piezoelectric thin film layer is disposed on the TFT circuit layer located at the edge region.
Further, in various embodiments, a polarizer layer is disposed on the piezoelectric thin film layer.
Further, another aspect of the present invention provides a terminal device, which includes a data processing unit, a storage unit, and the display panel related to the present invention, wherein the data processing unit is electrically connected to the TFT circuit layer in the display panel and is capable of receiving data information sent by the TFT circuit layer, the data processing unit processes the received data information to obtain feature point information of a face to be recognized contained therein, and then sends the feature point information to the storage unit for data storage; or comparing the feature point information with the feature point data stored in the storage unit.
Further, in different embodiments, the terminal device may be specifically one of smart terminals such as a smart phone, a smart tablet, a computer, and the like, but is not limited thereto.
Compared with the prior art, the invention has the beneficial effects that: according to the display panel, the ultrasonic face recognition module unit is introduced, the TFT circuit layer of the display panel is used for providing voltage signals for the display panel, the functional layer of the display panel is effectively utilized, the functions which can be integrated by the display panel can be further expanded, the function integration level of the display panel is improved, and the application range of the display panel is expanded to a certain extent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a piezoelectric thin film layer included in the display panel shown in fig. 1;
fig. 3 is a schematic structural diagram of a display panel according to still another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display panel according to still another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display panel according to still another embodiment of the present invention;
fig. 6 is a flowchart of an operation of performing ultrasonic face recognition by using a terminal device according to still another embodiment of the present invention.
Detailed Description
The following describes a display panel and a terminal device thereof according to the present invention in further detail with reference to the accompanying drawings and embodiments.
Referring to fig. 1, one embodiment of the present invention provides a display panel, which defines a display area 101 and an edge area 102 where effective display cannot be performed.
As shown in fig. 1, in the display region, a TFT circuit layer 10, a polarizer 11, glass 12, a liquid crystal layer 13, a touch layer 14, glass 15, a polarizing plate 16, an adhesive layer 17, and a protective glass 18 are stacked. In the edge region 102, the TFT circuit layer 10, the piezoelectric thin film layer 21, and the protective layer 22 are stacked.
The piezoelectric film layer 21 is electrically connected with the TFT circuit layer 10, and can transmit an ultrasonic signal according to a received voltage signal output by the TFT circuit layer 10, the transmitted ultrasonic signal is reflected by a face to be recognized and received by the piezoelectric film layer 21, and the piezoelectric film layer 21 converts the received ultrasonic signal into a voltage signal and transmits the voltage signal to the TFT circuit layer 10; the TFT circuit layer 10 processes the received voltage signal containing the facial feature information to be recognized and then outputs the processed data information.
The protective layer 22 is preferably an acoustic coupling layer with low acoustic resistance, so that the energy loss of the ultrasonic waves is reduced when the ultrasonic waves are transmitted to the air. Specifically, the material used for the protection layer 22 may be a mixture of two or more of polyethylene PE, polyurethane PU, polystyrene PS, rubber, nylon, and other high polymer materials.
And in order to make the ultrasonic wave have stronger penetrating effect, the penetrating process loss is smaller, wherein the piezoelectric film layer 21 is preferably designed to emit the low-frequency ultrasonic wave, but not limited. Specifically, the ultrasonic frequency of the low-frequency ultrasonic wave is 25kHz to 100 kHz.
As shown in fig. 2, the piezoelectric thin film layer includes an upper electrode 201, a piezoelectric material layer 202, a lower electrode 203, and an insulating layer 204, which are stacked, wherein the insulating layer 204 includes 2 insulating layers respectively disposed at two ends of the lower electrode 203 at intervals. Further, increasing the thickness of the piezoelectric material layer 202 may increase output sound pressure, which may result in an enhanced recognition effect.
Referring to fig. 3, a display panel defined with a display area 101 and a border area 102 according to another embodiment of the present invention is shown.
As shown in fig. 3, in the display region, a TFT circuit layer 10, a polarizer 11, glass 12, a liquid crystal layer 13, a touch layer 14, glass 15, a polarizing plate 16, an adhesive layer 17, and a protective glass 18 are stacked. The TFT circuit layer 10 is also extended to the edge region 102, and a piezoelectric thin film layer 21 and a protective layer 22 are stacked thereon.
The piezoelectric film layer 21 and the protective layer 22 are spaced apart from each other, a connecting blind hole 212 is arranged between the piezoelectric film layer 21 and the protective layer 22, and the connecting blind hole 212 can be filled with a material which is beneficial to ultrasonic transmission, such as a mixture of two or more of Polyethylene (PE), Polyurethane (PU), Polystyrene (PS), rubber, nylon and other high polymer materials.
In this embodiment, due to the addition of the design of the "connection blind via 212", the TFT circuit layer used in the piezoelectric thin film layer 21 and the TFT circuit layer in the display area are located in the same layer, which simplifies the manufacturing process of the display panel.
Referring to fig. 4, a display panel according to another embodiment of the present invention is illustrated, which is a full-screen display panel without distinguishing a display area and a border area, and includes module units in an in-cell structure.
Specifically, the liquid crystal display panel comprises a TFT circuit layer 10, a piezoelectric thin film layer 21, a polarizer 11, a first glass layer 12, a liquid crystal layer 13, a touch layer 15, a second glass layer 14, a polarizing plate 16, an adhesive 17 and a protective glass layer 18 which are stacked.
Compared with the application of the display panel with two edge regions having no display region shown in fig. 1 and 3, the display panel shown in fig. 4 has the advantage that the screen occupation ratio can be increased, but the number of layers through which the ultrasonic waves emitted by the piezoelectric film layer 21 pass upward is more, so that the output voltage needs to be increased, the output sound pressure is higher, and the same sound pressure is obtained when the ultrasonic waves reach the human face.
Referring to fig. 5, a display panel according to another embodiment of the present invention is illustrated, which is a full-screen display panel without distinguishing a display area and a border area, and includes module units in an on-cell structure.
Specifically, the liquid crystal display panel comprises a TFT circuit layer 10, a piezoelectric thin film layer 21, a polarizer 11, a first glass layer 12, a liquid crystal layer 13, a second glass layer 14, a touch layer 15, a polarizing plate 16, an adhesive 17 and a protective glass layer 18 which are stacked.
Further, another embodiment of the present invention provides an application of the display panel related to the present invention to a terminal device, thereby providing a complete ultrasonic face recognition solution. The terminal device may be specifically one of a smart phone, a smart tablet, a computer terminal, and the like, but is not limited thereto.
The terminal device comprises a data processing unit, a storage unit and the display panel, wherein the data processing unit is electrically connected with the TFT circuit layer in the display panel and can receive data information sent by the TFT circuit layer, and the processing unit is connected with the storage unit and can transmit data to be stored into the storage unit or call the data stored in the storage unit.
Fig. 6 is a flowchart illustrating the operation of the terminal device according to the present invention for performing ultrasonic face recognition.
As shown in fig. 6, firstly, the TFT layer 10 transmits a voltage signal to the piezoelectric thin film layer 21, so that the voltage signal vibrates and generates ultrasonic waves to be emitted, and when the emitted ultrasonic waves are transmitted to a face to be recognized, the ultrasonic waves are reflected and return to the piezoelectric thin film layer 21;
the piezoelectric film layer 21 receives the reflected ultrasonic wave, converts the ultrasonic wave into a voltage signal, and outputs the voltage signal to the TFT layer 10, and the TFT circuit layer 10 performs preliminary processing on the received voltage signal containing the facial feature information to be recognized, and then outputs the processed data information to the data processing unit 30.
The data processing unit 30 correspondingly analyzes and processes the received data information, extracts and analyzes the feature points of the face to be recognized contained in the data information, and then sends the feature point information to the storage unit 40 for data storage; or comparing the feature point information with the feature point data stored in the storage unit 40.
According to the display panel, the ultrasonic face recognition module unit is introduced, the TFT circuit layer of the display panel is used for providing voltage signals for the display panel, the functional layer of the display panel is effectively utilized, the functions which can be integrated by the display panel can be further expanded, the function integration level of the display panel is improved, and the application range of the display panel is expanded to a certain extent.
The technical scope of the present invention is not limited to the contents described in the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and these changes and modifications should fall within the scope of the present invention.
Claims (4)
1. A display panel is defined with a display area and an edge area which can not display images and comprises an array substrate; the array substrate is characterized in that a TFT circuit layer, a polarizer, glass, a liquid crystal layer, a touch layer, glass, a polarizing plate, an adhesive layer and protective glass are laminated in the display area; wherein a TFT circuit layer, a piezoelectric thin film layer arranged on the TFT circuit layer and a protective layer arranged on the piezoelectric thin film layer are stacked in the edge region;
the piezoelectric film layer is electrically connected with the TFT circuit layer and can transmit an ultrasonic signal according to a received voltage signal output by the TFT circuit layer, the transmitted ultrasonic signal is reflected back by a face to be recognized and received by the piezoelectric film layer, and the piezoelectric film layer converts the received ultrasonic signal into a voltage signal and transmits the voltage signal to the TFT circuit layer; the TFT circuit layer processes the received voltage signal containing the human face characteristic information to be recognized and then outputs the processed data information;
the piezoelectric thin film layer and the protective layer are arranged at intervals; the piezoelectric film layer is connected with the protective layer through a connecting blind hole; the connecting blind hole is filled with two or more of high polymer materials such as polyethylene, polyurethane, polystyrene, rubber, nylon and the like.
2. The display panel according to claim 1; the frequency of ultrasonic waves emitted by the piezoelectric film layer is within the range of 25 kHz-100 kHz.
3. The display panel according to claim 1; the protective layer is characterized in that the protective layer is made of at least one of polyethylene, polyurethane, polystyrene, rubber and nylon materials.
4. A terminal device includes a data processing unit, a storage unit; characterized in that it further comprises a display panel according to claim 1;
the data processing unit is electrically connected with the TFT circuit layer in the display panel and can receive data information sent by the TFT circuit layer, the data processing unit processes the received data information to obtain characteristic point information of a face to be recognized contained in the data information, and then the characteristic point information is sent to the storage unit for data storage; or comparing the feature point information with the feature point data stored in the storage unit.
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| CN201910235753.3A CN110046556B (en) | 2019-03-27 | 2019-03-27 | Display panel and terminal device thereof |
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| CN201910235753.3A CN110046556B (en) | 2019-03-27 | 2019-03-27 | Display panel and terminal device thereof |
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| CN110046556B true CN110046556B (en) | 2021-06-01 |
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| CN110471224A (en) * | 2019-08-27 | 2019-11-19 | 业成科技（成都）有限公司 | Curved face type combination die group and preparation method thereof |
| CN111403461B (en) * | 2020-03-27 | 2022-12-23 | 京东方科技集团股份有限公司 | Flexible display panel and preparation method thereof |
| CN114442807B (en) * | 2022-01-18 | 2024-01-19 | 惠州Tcl移动通信有限公司 | Ultrasonic wave generating assembly and electronic equipment |
| CN115598647A (en) * | 2022-12-13 | 2023-01-13 | 三微电子科技（苏州）有限公司（Cn） | Film piezoelectric sound pressure sensor and detection imaging device |
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