CN113838373B - Display panel, detection method and display device - Google Patents
Display panel, detection method and display device Download PDFInfo
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- CN113838373B CN113838373B CN202110961052.5A CN202110961052A CN113838373B CN 113838373 B CN113838373 B CN 113838373B CN 202110961052 A CN202110961052 A CN 202110961052A CN 113838373 B CN113838373 B CN 113838373B
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- 238000001514 detection method Methods 0.000 title claims abstract description 84
- 238000005452 bending Methods 0.000 claims abstract description 78
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000010410 layer Substances 0.000 claims description 227
- 239000011241 protective layer Substances 0.000 claims description 6
- 230000003068 static effect Effects 0.000 abstract description 5
- 239000012790 adhesive layer Substances 0.000 description 13
- 230000007935 neutral effect Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000007530 organic bases Chemical class 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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Abstract
The application discloses a display panel, a detection method and a display device, wherein the display panel comprises: the display screen is provided with a folding area; the detection module is used for detecting the thickness of the folding area of the display screen and detecting the bending angle of the folding area according to the thickness of the folding area. In the use, can detect the thickness of the folding region of display screen through detection module, because the thickness of folding region can change at folding in-process, the thickness of folding region is different under different bending angles, and the bending angle of folding region has certain correspondence with thickness, consequently, can detect the bending angle of folding region according to the thickness of folding region, can detect the bending angle that folding region is in static bending state or dynamic bending state, can acquire the folding state of display screen, and then judge the running state of terminal.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a display panel, a detection method and a display device.
Background
With the development of electronic devices, folding screen electronic devices have been developed, which have the advantages of large screen and portability, and have been receiving attention. In the process of bending the screen, it is difficult to detect the bending angle of the screen, and the folding state of the screen cannot be determined.
Disclosure of Invention
The embodiment of the application aims to provide a display panel, a detection method and a display device, which are used for solving the problem that the bending angle of a screen is not easy to detect in the bending process of the screen.
In a first aspect, an embodiment of the present application provides a display panel, including:
a display screen having a fold area;
the detection module is used for detecting the thickness of the folding area of the display screen and detecting the bending angle of the folding area according to the thickness of the folding area.
Wherein, detection module includes:
the piezoelectric layer is arranged on one side of the display screen and is positioned in the folding area;
an electrode connected to the piezoelectric layer to apply a voltage to the piezoelectric layer and/or to transmit an electrical signal generated by the piezoelectric layer;
the first detection module is used for detecting an electric signal generated by the piezoelectric layer, and detecting the thickness of a folding area of the display screen according to the electric signal;
the second detection module detects the bending angle of the folding area according to the thickness of the folding area.
The first detection module is also used for detecting the image of the fingerprint which is stopped at the other side of the display screen according to the electric signal generated by the piezoelectric layer.
The first detection module detects the thickness of a folding area of the display screen according to the first electric signal;
the first detection module detects an image of a fingerprint which is stopped against the other side of the display screen according to the second electric signal, and the frequency of the first electric signal is different from that of the second electric signal.
Wherein the electrode is used for inputting a first voltage to the piezoelectric layer so that the piezoelectric layer can generate a first electric signal;
the electrode is used for inputting a second voltage to the piezoelectric layer so that the piezoelectric layer can generate a second electric signal, and the frequency of the first voltage is different from that of the second voltage.
Wherein the electrode comprises:
the first electrode is arranged on one side of the piezoelectric layer, which is close to the display screen;
the second electrode is arranged on one side of the piezoelectric layer, which is far away from the display screen;
and the circuit layer is respectively connected with the first electrode and the second electrode.
The electrode comprises a plurality of first electrodes, and the first electrodes are distributed in an array; and/or
The display panel further includes:
the protective layer is arranged on one side of the piezoelectric layer far away from the display screen and covers the second electrode; and/or
Further comprises:
the bonding layer is arranged between the display screen and the piezoelectric layer, and the first electrode and the circuit layer are positioned between the bonding layer and the piezoelectric layer.
Wherein, still include: the bonding layer is arranged between the display screen and the piezoelectric layer, and the first electrode and the circuit layer are positioned between the bonding layer and the piezoelectric layer;
the first detection module detects the total thickness of the folding area of the display screen, the bonding layer, the first electrode and the circuit layer according to the electric signal;
the second detection module detects the bending angle of the folding area according to the total thickness of the folding area of the display screen, the bonding layer, the first electrode and the circuit layer; or alternatively
The first detection module detects the total thickness of the folding area of the display screen and the first electrode according to the electric signal;
the second detection module detects the bending angle of the folding area according to the folding area of the display screen and the total thickness of the first electrode; or alternatively
The first electrode is positioned between the circuit layer and the piezoelectric layer, and the first detection module detects the total thickness of the folding area of the display screen, the first electrode and the circuit layer according to the electric signal;
the second detection module detects the bending angle of the folding area according to the folding area of the display screen, the total thickness of the first electrode and the circuit layer.
In a second aspect, an embodiment of the present application provides a method for detecting a bending angle of a folding area of a display panel, including:
detecting the thickness of the folding area;
and detecting the bending angle of the folding area according to the thickness of the folding area.
In a third aspect, an embodiment of the present application provides a display device including the display panel described in the above embodiment.
The display panel in the embodiment of the application comprises: a display screen having a fold area; the detection module is used for detecting the thickness of the folding area of the display screen and detecting the bending angle of the folding area according to the thickness of the folding area. In the use, can detect through detection module the thickness of the folding region of display screen, because the thickness of folding region can change at folding in-process, the thickness of folding region is different under different bending angles, and the bending angle of folding region has certain correspondence with thickness, consequently, can detect according to the thickness of folding region the bending angle of folding region can detect the bending angle that folding region is in static bending state or dynamic bending state, can acquire the folding state of display screen, and then judges the running state of terminal.
Drawings
FIG. 1 is a schematic diagram of a detection module cooperating with a display screen;
FIG. 2 is a schematic illustration of the piezoelectric layer mated with an electrode;
FIG. 3 is a schematic diagram showing a distribution of the first electrode on the circuit layer;
FIG. 4a is a schematic view of a display screen in which the film layer is in a non-bent state;
FIG. 4b is a schematic view of the film layer in the display screen in an outwardly bent state;
FIG. 4c is a schematic view of the film layer in the display screen in an inward bent state;
FIG. 5 is a schematic view of the thickness and bending angle of the outer layer in the inner bending state;
FIG. 6 is a schematic view of the thickness and bending angle of the inner layer in the inner bending state;
FIG. 7 is another schematic diagram of the detection module cooperating with a display screen;
FIG. 8 is a schematic view of functional areas in a fold area on a display screen;
FIG. 9 is a schematic diagram showing the detection module cooperating with a display screen.
Reference numerals
A display screen 10; a polarizer 11; an optical adhesive layer 12; a cover plate 13; a connection layer 14; a substrate 15;
a nonfunctional area 101; a functional area 102;
an outer film layer 16; a neutral layer 17; an inner membrane layer 18;
a detection module 20; a first electrode 21; a second electrode 22; a piezoelectric layer 23; a circuit layer 24;
a protective layer 30;
an adhesive layer 40.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application may be practiced otherwise than as specifically illustrated or described herein. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The following describes in detail a display panel provided by an embodiment of the present application through specific embodiments and application scenarios thereof, with reference to fig. 1 to 9.
As shown in fig. 1 to 9, a display panel according to an embodiment of the present application includes: the display screen 10 and the detection module 20, wherein the display screen 10 has a folding area, for example, the folding area of the display screen 10 is a flexible area, and bending can be realized. The detecting module 20 may be used for detecting the thickness of the folded area of the display screen 10, for example, the thickness may be measured by an ultrasonic detector, or the thickness of the folded area may be detected by other instruments or methods according to the actual situation, and the detecting module 20 may detect the bending angle of the folded area according to the thickness of the folded area. The detection module 20 can be arranged on one side of the display screen 10, can be arranged in a folding area of the display screen 10, one side of the display screen 10 can be provided with the substrate 15, the substrate can be a stainless steel material piece, a hollow-out part can be arranged in an area corresponding to the folding area of the display screen 10 on the substrate 15, the detection module 20 can be arranged in the hollow-out part, the detection module 20 can be attached to one side of the display screen 10 through the connecting layer 14, and the connecting layer 14 can be a pressure-sensitive adhesive layer. The other side of the display screen 10 may be provided with a polarizer 11, so that light rays in a specific direction pass through, one side of the polarizer 11 away from the display screen 10 may be provided with a cover plate 13, the cover plate 13 may be a polyimide layer, and the cover plate 13 and the polarizer 11 may be bonded through an optical adhesive layer 12.
As shown in fig. 4a to 4c, the flexible film layer has a concept of a neutral layer during bending, the inner film layer 18 is pressed inside the neutral layer 17, the thickness of the inner film layer 18 is correspondingly thickened, and the outer film layer 16 is stretched outside the neutral layer 17, and the thickness of the outer film layer 16 is thinned, as shown in fig. 4 b. As shown in fig. 4c, for the folded-in film layer, the detection module is outside the bending region of the film layer, and the film layer as a whole shows a stretching trend; as shown in fig. 4b, for the folded-out film, the detection module is located inside the folded-out area, and the film is pressed to thin. The relationship between the thickness of the outer film layer and the bending angle during the inner bending can be shown in fig. 5, and the relationship between the thickness of the inner film layer and the bending angle during the inner bending can be shown in fig. 6. The thickness of the folding area can be changed in the folding process, the thickness of the folding area is different under different folding angles, the folding angle of the folding area has a certain corresponding relation with the thickness, and the folding angle of the folding area can be detected according to the thickness of the folding area. In the application process, the film layer of the folding area of the screen has a large influence on the reliability test, so that the integral lamination structure of the folding area needs to be simulated and verified during design, the film layer such as a circuit layer in the panel is ensured to be positioned at a neutral layer, and the influence on functions after bending is prevented.
In the use process, the thickness of the folding area of the display screen 10 can be detected through the detection module 20, and as the thickness of the folding area can be changed in the folding process, the thickness of the folding area is different under different bending angles, and the bending angle of the folding area has a certain corresponding relation with the thickness, therefore, the bending angle of the folding area can be detected according to the thickness of the folding area, the bending angle of the folding area in a static bending state or a dynamic bending state can be detected, the folding state of the display screen can be obtained, and the running state of the terminal can be judged, so that the automatic switching of functions such as whether the screen is split or not can be confirmed.
In some embodiments, as shown in fig. 2, 7 and 9, the detection module 20 may include: the piezoelectric layer 23, the electrode, the first detection module and the second detection module, the piezoelectric layer 23 can be arranged on one side of the display screen 10 and located in the folding area, the piezoelectric layer 23 can be attached to the surface of one side of the display screen 10, and the piezoelectric layer 23 can be arranged on part of the folding area or cover the whole folding area, so that the thickness of the folding area can be accurately detected. The electrode may be connected to the piezoelectric layer 23, a voltage may be applied to the piezoelectric layer 23 through the electrode and/or an electrical signal generated by the piezoelectric layer 23 may be transmitted, an ultrasonic wave may be generated by the piezoelectric layer 23 in the case that a voltage is applied to the piezoelectric layer 23 through the electrode, the piezoelectric layer 23 generates an electrical signal when the ultrasonic wave is reflected to the piezoelectric layer 23, a time interval between the generation of the ultrasonic wave by the piezoelectric layer 23 and the reception of the reflected ultrasonic wave may be acquired through the electrical signal generated by the piezoelectric layer 23, and the thickness of the folded region may be detected according to the time interval. The first detection module may be used for detecting an electrical signal generated by the piezoelectric layer 23, the first detection module may detect a thickness of a folded region of the display screen 10 according to the electrical signal, and the second detection module may detect a bending angle of the folded region according to the thickness of the folded region.
In the application process, the piezoelectric layer 23 can convert the high-frequency alternating electrical signal provided by the electrode into a mechanical vibration signal to further emit ultrasonic waves, and can convert mechanical vibration caused by the reflected ultrasonic wave signal into an electrical signal to be transmitted to the first detection module, and the first detection module can detect the thickness of the folding area of the display screen 10 according to the electrical signal. The acoustic resistance of the display stack is orders of magnitude different from that of air, so that the ultrasonic waves are almost totally reflected at the interface between the display and air, which results in almost total reflection of the ultrasonic waves emitted from the piezoelectric layer 23 back to the piezoelectric layer 23, and at this time, the time for the piezoelectric layer 23 to generate ultrasonic waves and for the ultrasonic waves to be reflected to the piezoelectric layer 23 depends on the material and thickness of the film layer. When a finger touches the other side of the display 10, the fingerprint ridge is in contact with the display 10, and the acoustic resistance of the finger is similar to that of the display 10, a large part of sound waves are transmitted through the display 10 to reach the finger, so that the signal reflected by the display 10 back to the piezoelectric layer is weakened, and the time for returning the ultrasonic waves can be used for detecting the thickness of the folding area of the display 10.
In other embodiments, the first detection module is further configured to detect an image of a fingerprint that is abutted against the other side of the display screen 10 according to the electrical signal generated by the piezoelectric layer 23, and the first detection module may detect an image of a fingerprint that is abutted against the other side of the display screen 10 according to the intensity of the electrical signal generated by the piezoelectric layer 23. When a finger touches the other side of the display screen 10, the fingerprint ridge is in contact with the display screen 10, the acoustic resistance of the finger is similar to that of the display screen 10, and most of sound waves are transmitted through the display screen 10 to reach the finger, so that the signal of the display screen 10 reflected back to the piezoelectric layer is weakened, the intensity and time of the ultrasonic waves reflected back from different positions are different, and the pattern of the fingerprint which is stopped against the other side of the display screen 10 can be obtained by comparing the differences of the signals from different positions. The thickness of the folding area can be detected through the detection module, the bending angle of the folding area can be judged, the pattern of the fingerprint on the other side of the display screen 10 can be obtained, the two functions are integrated, the additional screen bending angle sensor is reduced, the occupation of the space is reduced, and the cost is reduced.
In an embodiment of the present application, the electrical signal may include a first electrical signal and a second electrical signal, the first electrical signal and the second electrical signal may have different frequencies, the first detection module may detect the thickness of the folded region of the display screen 10 according to the first electrical signal, and the first detection module may detect the image of the fingerprint that is stopped at the other side of the display screen 10 according to the second electrical signal, for example, the first detection module may detect the image of the fingerprint that is stopped at the other side of the display screen 10 according to the intensity of the second electrical signal. In the thickness detection process of ultrasonic fingerprint identification and folding area, can adopt the electrical signal of different frequency, the timesharing drive, first detection module can detect the thickness of the folding area of display screen 10 according to first electrical signal, can detect the image of stopping the fingerprint at the opposite side of display screen 10 according to the second electrical signal, detects the thickness of folding area and the image of fingerprint through the electrical signal of different frequency can improve the accuracy that detects.
In some embodiments, an electrode may be used to input a first voltage to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate a first electrical signal, and an electrode may be used to input a second voltage to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate a second electrical signal, the first voltage being at a different frequency than the second voltage. For example, the electrode may input a first voltage to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate an ultrasonic wave of a first frequency, and the piezoelectric layer 23 may generate a first electrical signal when the ultrasonic wave of the first frequency is reflected to the piezoelectric layer 23. The electrode may input a second voltage to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate ultrasonic waves of a second frequency, and when the ultrasonic waves of the second frequency are reflected to the piezoelectric layer 23, the piezoelectric layer 23 may generate a second electrical signal. For example, during a frame time, the former period of time allows the piezoelectric layer 23 to emit an ultrasonic signal at a frequency a, and the latter period of time allows the ultrasonic signal at a frequency b to be emitted, so that the ultrasonic waves can be distinguished by frequency to obtain an accurate fingerprint image and an accurate measurement of the thickness of the folded region.
In the application process, the electrode can input a voltage signal to the piezoelectric layer 23 so that the piezoelectric layer 23 can generate ultrasonic waves, when the ultrasonic waves are reflected to the piezoelectric layer 23, the piezoelectric layer 23 can generate electric signals, the intensity of the ultrasonic waves reflected to the piezoelectric layer 23 and the time interval between the ultrasonic waves sent by the piezoelectric layer 23 and the ultrasonic waves received after reflection can be obtained through the electric signals, the image of the fingerprint can be obtained according to the intensity of the ultrasonic waves, the thickness of the folding area of the display screen can be detected according to the time interval, and then the bending angle can be detected. For example, the electrode may input a first voltage to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate an ultrasonic wave of a first frequency, and when the ultrasonic wave of the first frequency is reflected to the piezoelectric layer 23, the piezoelectric layer 23 may generate a first electric signal, the intensity of the ultrasonic wave reflected to the piezoelectric layer 23 may be acquired through the first electric signal, and an image of the fingerprint may be acquired according to the intensity of the ultrasonic wave. The electrode can input a second voltage to the piezoelectric layer 23, so that the piezoelectric layer 23 can generate ultrasonic waves with a second frequency, when the ultrasonic waves with the second frequency are reflected to the piezoelectric layer 23, the piezoelectric layer 23 can generate a second electric signal, a time interval between the ultrasonic waves sent by the piezoelectric layer 23 and the ultrasonic waves received after reflection can be obtained through the second electric signal, and the thickness of a folding area of the display screen can be detected according to the time interval, so that the bending angle can be detected.
In an embodiment of the present application, as shown in fig. 2, 3, 7 and 9, the electrode may include: the first electrode 21, the second electrode 22 and the circuit layer 24, the first electrode 21 and the second electrode 22 are respectively made of conductive materials, such as metal, the first electrode 21 can be arranged on one side of the piezoelectric layer 23 close to the display screen 10, the second electrode 22 can be arranged on one side of the piezoelectric layer 23 far away from the display screen 10, the first electrode 21 and the second electrode 22 are respectively arranged on two sides of the piezoelectric layer 23, the circuit layer 24 can be respectively connected with the first electrode 21 and the second electrode 22, an electric signal can be input to the first electrode 21 and the second electrode 22 through the circuit layer 24, and the electric signal generated by the piezoelectric layer 23 can be also transmitted to the circuit layer 24 through the first electrode 21 and the second electrode 22. The electrodes may include a plurality of first electrodes 21, the plurality of first electrodes 21 may be distributed in an array, the second electrodes 22 may be metal electrode layers, each electrode may be controlled independently by adjusting a timing sequence, electrical signals of different location areas may be detected, thickness of a folded area may be accurately detected, and an accurate fingerprint image may be acquired.
In some embodiments, as shown in fig. 2, 7 and 9, the display panel may further include: the protective layer 30, the protective layer 30 may be disposed on a side of the piezoelectric layer 23 away from the display screen 10 and cover the second electrode 22, and the piezoelectric layer 23 and the second electrode 22 may be protected by the protective layer 30. The display panel may further include: the adhesive layer 40, the adhesive layer 40 may be disposed between the display screen 10 and the piezoelectric layer 23, and the first electrode 21 and the circuit layer 24 may be disposed between the adhesive layer 40 and the piezoelectric layer 23. The adhesive layer 40 may be adhered to the surface of the display screen 10, and the adhesive layer 40 may be optical adhesive (OCA), thermo-sensitive adhesive (PSA), optical liquid adhesive or water-soluble adhesive (OCR). The adhesive layer 40 may be flexible material such as flexible organic base material of polyimide (CPI), polyester resin (PET), cyclic Olefin Polymer (COP), or flexible glass such as ultrathin glass (UTG) which can be folded.
In some embodiments, the display panel further includes: the bonding layer 40, the bonding layer 40 is disposed between the display 10 and the piezoelectric layer 23, the first electrode 21 and the circuit layer 24 are disposed between the bonding layer 40 and the piezoelectric layer 23, the first detection module can detect the folding area of the display 10, the total thickness of the bonding layer 40, the first electrode 21 and the circuit layer 24 according to the electric signal generated by the piezoelectric layer 23, and the second detection module can detect the folding angle of the folding area according to the folding area of the display 10, the bonding layer 40, the total thickness of the first electrode 21 and the circuit layer 24. As shown in fig. 7, the ultrasonic waves pass through the folded region of the display screen 10, the adhesive layer 40, the first electrode 21 and the circuit layer 24 in the process of being emitted and reflected to the piezoelectric layer 23, although the thicknesses of the adhesive layer 40, the first electrode 21 and the circuit layer 24 are extremely small relative to the thickness of the folded region of the display screen 10, if the thicknesses of the adhesive layer 40, the first electrode 21 and the circuit layer 24 are considered in the process of detecting the thickness, the accuracy of thickness detection can be improved, and the accuracy of the bending angle of the folded region can be further improved.
Optionally, the first detecting module may detect the folding area of the display screen 10 and the total thickness of the first electrode 21 according to the electrical signal, and the second detecting module may detect the bending angle of the folding area according to the folding area of the display screen and the total thickness of the first electrode 21, although the thickness of the first electrode 21 is very small relative to the thickness of the folding area of the display screen 10, if the thickness of the first electrode 21 is considered in the process of detecting the thickness, the accuracy of thickness detection can be improved, and the accuracy of the bending angle of the folding area is further improved.
In some embodiments, the first electrode 21 is located between the circuit layer 24 and the piezoelectric layer 23, the first detection module can detect the folding area of the display screen 10, the total thickness of the first electrode 21 and the circuit layer 24 according to the electrical signal, and the second detection module can detect the bending angle of the folding area according to the folding area of the display screen 10, the total thickness of the first electrode 21 and the circuit layer. Although the thicknesses of the first electrode 21 and the circuit layer 24 are very small relative to the thickness of the folded region of the display screen 10, if the thicknesses of the first electrode 21 and the circuit layer 24 are considered in the process of detecting the thickness, the accuracy of thickness detection can be improved, and the accuracy of the bending angle of the folded region can be further improved. In the application process, the thickness of other film layers between the display screen 10 and the piezoelectric layer 23 can be considered, so that the accuracy of the bending angle of the folding area is further improved. As shown in fig. 8, the detection module may integrally cover the whole folded area, and the whole module may be divided into a functional area 102 and a non-functional area 101, wherein the upper and lower sides of the piezoelectric layer in the functional area 102 are provided with a first electrode 21 and a second electrode 22, the first electrode 21 may be connected with the circuit layer 24, and the thicknesses of the circuit layer 24 and the electrode are negligible relative to those of the piezoelectric layer 23 and the adhesive layer, so that bending neutral layer debugging and film layer thickness selection can be easier.
As shown in fig. 7, in the detection, ultrasonic waves are emitted simultaneously by the piezoelectric layer 23 upwards and downwards, ultrasonic waves a propagating upwards can generate transmission B and reflection C on the surface of the display screen 10, ridges and valleys of the fingerprint mainly affect the intensity of ultrasonic reflection, the reflection at the positions where the ridges are in contact is weaker, almost total reflection occurs at the positions where the valleys are in contact, so that obvious difference exists in the intensity of ultrasonic waves B reflected back to the piezoelectric layer 23, the intensity of induced electric signals generated by the piezoelectric layer 23 is affected, and the first detection module can obtain an image of the fingerprint by drawing a graph of the reflected intensity of the reaction. The ultrasonic wave D emitted downwards has almost total reflection because of no medium after reaching the boundary, so after the ultrasonic wave passes through the D and E sections, the piezoelectric layer 23 has a distinct piezoelectric signal, and because the thickness of the medium layer below the piezoelectric layer 23 is significantly smaller than that of the film layers such as the display screen and the cover plate above, the ultrasonic wave D is significantly different from the time of the electric signal above, and the probability of interference is smaller. When the display screen is folded inwards, the film layer below the display screen is stretched to reduce the thickness, so that the time D and E from the transmission to the reception of the ultrasonic waves can be shortened, the thickness is reduced along with the increase of the bending angle, the time Deltat between the transmission and the reception of the ultrasonic waves can be gradually reduced, and the relation between the thickness and the bending angle can be shown as shown in figure 5. Fingerprint and angle of buckling can all be measured through the ultrasonic signal A/C of display screen upside, can measure the intensity of ultrasonic wave, can draw the fingerprint image through detecting the intensity of the piezoelectricity signal that the echo signal received by piezoelectricity layer produced, can measure the thickness of rete through gathering echo signal and the time difference of transmitting ultrasonic wave, can detect the angle of buckling through thickness.
The embodiment of the application provides a method for detecting the bending angle of a folding area of a display panel, which comprises the following steps:
detecting the thickness of the folding area;
and detecting the bending angle of the folding area according to the thickness of the folding area.
The thickness of the folded area of the display screen 10 in the display panel can be detected, for example, the thickness can be measured by an ultrasonic detector, the thickness of the folded area can be detected by other instruments or methods according to actual situations, and the detection module can detect the bending angle of the folded area according to the thickness of the folded area. In the use, can detect the thickness of the folding region of display screen 10 through detection module, because the thickness of folding region can change at folding in-process, the thickness of folding region is different under different bending angles, and the bending angle of folding region has certain correspondence with thickness, consequently, can detect according to the thickness of folding region the bending angle of folding region can detect the bending angle that folding region is in static bending state or dynamic bending state, can acquire the folding state of display screen, and then judge the running state of terminal.
Optionally, the detection module may include: the piezoelectric layer 23, the electrode, the first detection module and the second detection module, the piezoelectric layer 23 may be disposed at one side of the display screen 10 and located in the folded region. The electrode and the piezoelectric layer 23 may be connected, a voltage may be applied to the piezoelectric layer 23 through the electrode and/or an electrical signal generated by the piezoelectric layer 23 may be transmitted, an ultrasonic wave may be generated by the piezoelectric layer 23 under the condition that a voltage is applied to the piezoelectric layer 23 through the electrode, the piezoelectric layer 23 generates an electrical signal when the ultrasonic wave is reflected to the piezoelectric layer 23, the electrical signal generated by the piezoelectric layer 23 may be detected by the first detection module, the first detection module may detect a thickness of a folding region of the display screen 10 according to the electrical signal, and the second detection module may detect a bending angle of the folding region according to the thickness of the folding region.
Alternatively, an image of a fingerprint that abuts against the other side of the display screen 10 may be detected from the electrical signal generated by the piezoelectric layer 23. For example, an image of a fingerprint that is stopped against the other side of the display screen 10 may be detected by the first detection module based on the electrical signal generated by the piezoelectric layer 23.
Alternatively, the electrical signals may include a first electrical signal and a second electrical signal, the first electrical signal and the second electrical signal having different frequencies, the thickness of the folded region of the display screen 10 may be detected from the first electrical signal, and the image of the fingerprint that is stopped against the other side of the display screen 10 may be detected from the second electrical signal. In the ultrasonic fingerprint identification and thickness detection process of the folding area, electrical signals with different frequencies can be adopted for time-sharing driving, for example, the first detection module can detect the thickness of the folding area of the display screen 10 according to the first electrical signal, can detect the image of the fingerprint which is stopped against the other side of the display screen 10 according to the second electrical signal, and can improve the detection accuracy by detecting the thickness of the folding area and the image of the fingerprint through the electrical signals with different frequencies.
Alternatively, a first voltage may be input to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate a first electrical signal, and a second voltage may be input to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate a second electrical signal, the first voltage being different from the second voltage in frequency. For example, the electrode may input a first voltage to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate an ultrasonic wave of a first frequency, and the piezoelectric layer 23 may generate a first electrical signal when the ultrasonic wave of the first frequency is reflected to the piezoelectric layer 23. The electrode may input a second voltage to the piezoelectric layer 23 so that the piezoelectric layer 23 may generate ultrasonic waves of a second frequency, and when the ultrasonic waves of the second frequency are reflected to the piezoelectric layer 23, the piezoelectric layer 23 may generate a second electrical signal.
An embodiment of the present application provides a display device including the display panel described in the above embodiment. The display device with the display panel in the embodiment can detect the bending angle of the folding area in a static bending state or a dynamic bending state, and can acquire the folding state of the display screen.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.
Claims (9)
1. A display panel, comprising:
a display screen having a fold area;
the detection module is used for detecting the thickness of the folding area of the display screen and detecting the bending angle of the folding area according to the thickness of the folding area;
the detection module comprises:
the piezoelectric layer is arranged on one side of the display screen and is positioned in the folding area;
an electrode connected to the piezoelectric layer to apply a voltage to the piezoelectric layer and/or to transmit an electrical signal generated by the piezoelectric layer;
the first detection module is used for detecting an electric signal generated by the piezoelectric layer, and detecting the thickness of a folding area of the display screen according to the electric signal;
the second detection module detects the bending angle of the folding area according to the thickness of the folding area.
2. The display panel of claim 1, wherein the first detection module is further configured to detect an image of a fingerprint that abuts against the other side of the display screen based on an electrical signal generated by the piezoelectric layer.
3. The display panel according to claim 2, wherein the electrical signal includes a first electrical signal and a second electrical signal, and the first detection module detects a thickness of a folded region of the display screen according to the first electrical signal;
the first detection module detects an image of a fingerprint which is stopped against the other side of the display screen according to the second electric signal, and the frequency of the first electric signal is different from that of the second electric signal.
4. A display panel according to claim 3, wherein the electrode is adapted to input a first voltage to the piezoelectric layer so that the piezoelectric layer can generate a first electrical signal;
the electrode is used for inputting a second voltage to the piezoelectric layer so that the piezoelectric layer can generate a second electric signal, and the frequency of the first voltage is different from that of the second voltage.
5. The display panel of claim 1, wherein the electrode comprises:
the first electrode is arranged on one side of the piezoelectric layer, which is close to the display screen;
the second electrode is arranged on one side of the piezoelectric layer, which is far away from the display screen;
and the circuit layer is respectively connected with the first electrode and the second electrode.
6. The display panel of claim 5, wherein the electrode comprises a plurality of the first electrodes, the plurality of first electrodes being distributed in an array; and/or
The display panel further includes:
the protective layer is arranged on one side of the piezoelectric layer far away from the display screen and covers the second electrode; and/or
Further comprises:
the bonding layer is arranged between the display screen and the piezoelectric layer, and the first electrode and the circuit layer are positioned between the bonding layer and the piezoelectric layer.
7. The display panel of claim 5, further comprising:
the bonding layer is arranged between the display screen and the piezoelectric layer, and the first electrode and the circuit layer are positioned between the bonding layer and the piezoelectric layer;
the first detection module detects the total thickness of the folding area of the display screen, the bonding layer, the first electrode and the circuit layer according to the electric signal;
the second detection module detects the bending angle of the folding area according to the total thickness of the folding area of the display screen, the bonding layer, the first electrode and the circuit layer; or alternatively
The first detection module detects the total thickness of the folding area of the display screen and the first electrode according to the electric signal;
the second detection module detects the bending angle of the folding area according to the folding area of the display screen and the total thickness of the first electrode; or alternatively
The first electrode is positioned between the circuit layer and the piezoelectric layer, and the first detection module detects the total thickness of the folding area of the display screen, the first electrode and the circuit layer according to the electric signal;
the second detection module detects the bending angle of the folding area according to the folding area of the display screen, the total thickness of the first electrode and the circuit layer.
8. A method for detecting a bending angle of a folding area of a display panel, applied to the display panel according to any one of claims 1 to 7, comprising:
detecting the thickness of the folding area;
and detecting the bending angle of the folding area according to the thickness of the folding area.
9. A display device comprising the display panel of any one of claims 1-7.
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