CN113838373A - Display panel, detection method and display device - Google Patents
Display panel, detection method and display device Download PDFInfo
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- CN113838373A CN113838373A CN202110961052.5A CN202110961052A CN113838373A CN 113838373 A CN113838373 A CN 113838373A CN 202110961052 A CN202110961052 A CN 202110961052A CN 113838373 A CN113838373 A CN 113838373A
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- 238000001514 detection method Methods 0.000 title claims abstract description 78
- 238000005452 bending Methods 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000010410 layer Substances 0.000 claims description 223
- 239000011241 protective layer Substances 0.000 claims description 5
- 230000003068 static effect Effects 0.000 abstract description 5
- 239000012790 adhesive layer Substances 0.000 description 18
- 230000007935 neutral effect Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
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- 239000000463 material Substances 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
- 239000012528 membrane 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
- 238000012360 testing method Methods 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
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- 239000004020 conductor Substances 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- 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 display panel, detection method and display device, and the display panel includes: a display screen having a fold region; 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 folding regional thickness of display screen through detecting the module, because folding regional thickness can change in folding process, folding regional thickness is different under the angle of buckling of difference, folding regional angle of buckling and thickness have certain corresponding relation, therefore, can detect folding regional angle of buckling according to folding regional thickness, can detect folding regional angle of buckling under the static state of buckling or the dynamic state of buckling, can acquire the fold condition of display screen, and then judge the running state at 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
Along with the development of electronic equipment, folding screen electronic equipment has come to the end, and it possesses the big and portable advantage of screen, has received people's attention gradually. In the screen bending process, the bending angle of the screen is difficult to detect, and the folding state of the screen cannot be determined.
Disclosure of Invention
An object of the embodiments of the present application is to provide a display panel, a detection method and a display device, so as to solve the problem that a bending angle of a screen is not easy to detect in a screen bending process.
In a first aspect, an embodiment of the present application provides a display panel, including:
a display screen having a fold-over 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, the detection module includes:
the piezoelectric layer is arranged on one side of the display screen and is positioned in the folding area;
electrodes 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 the folding area of the display screen according to the electric signal;
and the second detection module is used for detecting the bending angle of the folding area according to the thickness of the folding area.
The first detection module is further used for detecting the image of the fingerprint which is stopped against 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 the 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 close to the display screen;
the second electrode is arranged on one side of the piezoelectric layer far away from the display screen;
a circuit layer connected to the first electrode and the second electrode, respectively.
Wherein the electrode comprises a plurality of first electrodes which are distributed in an array; and/or
The display panel further includes:
the protective layer is arranged on one side, far away from the display screen, of the piezoelectric layer and covers the second electrode; and/or
Further comprising:
the bonding layer is arranged between the display screen and the piezoelectric layer, and the first electrode and the circuit layer are located 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
The first detection module detects the folding area of the display screen and the total thickness of 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
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 total thickness of the folding area of the display screen, 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 embodiments.
The display panel in the embodiment of the present application includes: a display screen having a fold-over 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 the detection module the thickness of the folding region of display screen, because the thickness in folding in-process folding region can change, folding region's thickness is different under the angle of buckling of difference, folding region's angle of buckling and thickness have certain corresponding relation, consequently, can be based on folding region's thickness detects folding region's angle of buckling can detect folding region's angle of buckling, can detect folding region and be in the angle of buckling under static bending state or the dynamic bending state, can acquire the fold condition of display screen, and then judge the running state at terminal.
Drawings
FIG. 1 is a schematic view of a detection module cooperating with a display screen;
FIG. 2 is a schematic view of the piezoelectric layer in cooperation with an electrode;
FIG. 3 is a schematic view of a distribution of first electrodes on a circuit layer;
FIG. 4a is a schematic view of a display panel with a film layer in an unfolded state;
FIG. 4b is a schematic view of the display screen with the film layer in an outward bending state;
FIG. 4c is a schematic view of a display screen with a film layer in an inner bent state;
FIG. 5 is a schematic view of the outer layer thickness and the bending angle in the inner bending state;
FIG. 6 is a schematic view of the thickness and bending angle of the inner layer in an inner bent state;
FIG. 7 is another schematic view of the detecting module cooperating with the display screen;
FIG. 8 is a schematic view of a functional area in a fold area on a display screen;
FIG. 9 is a schematic view of the detecting module cooperating with the display screen.
Reference numerals
A display screen 10; a polarizer 11; an optical adhesive layer 12; a cover plate 13; a tie layer 14; a substrate 15;
a non-functional region 101; a functional region 102;
an outer membrane 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;
and an adhesive layer 40.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it should be understood that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive effort, shall fall within the scope of protection of the present application.
The terms first, second and the like in the description and in the claims of the present application 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 is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The following describes in detail a display panel provided in an embodiment of the present application with reference to fig. 1 to 9 through a specific embodiment and an application scenario thereof.
As shown in fig. 1 to 9, the display panel of the 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 the bending can be achieved. The detection module 20 may be configured to detect a thickness of the folding area of the display screen 10, for example, the thickness may be measured by an ultrasonic detector, or the thickness of the folding area may be detected by other apparatuses or methods according to actual conditions, and the detection module 20 may detect a bending angle of the folding area according to the thickness of the folding area. The detection module 20 can be arranged on one side of the display screen 10 and can be arranged in a folding area of the display screen 10, the substrate 15 can be arranged on one side of the display screen 10 and can be made of stainless steel materials, hollow parts 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 parts, the connection layer 14 can be used for enabling the detection module 20 to be attached to one side of the display screen 10, and the connection layer 14 can be a pressure-sensitive adhesive layer. A polarizer 11 may be disposed on the other side of the display screen 10 to allow light in a specific direction to pass through, a cover plate 13 may be disposed on one side of the polarizer 11 away from the display screen 10, the cover plate 13 may be a polyimide layer, and the cover plate 13 and the polarizer 11 may be bonded by an optical adhesive layer 12.
As shown in fig. 4a to 4c, the flexible film layer has a neutral layer concept during the bending process, the inner film layer 18 is compressed at the inner side of the neutral layer 17, the thickness of the inner film layer 18 is increased correspondingly, the outer film layer 16 is stretched at the outer side of the neutral layer 17, and the thickness of the outer film layer 16 is decreased as shown in fig. 4 b. As shown in fig. 4c, for the invaginated film layer, the detection module is located outside the bending region of the film layer, and the film layer exhibits a stretching tendency as a whole; as shown in fig. 4b, for the outer fold film layer, the detection module is located inside the bending region, and the film layer is pressed to thin the film layer. 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 influence of the film layer of the screen folding region on the reliability test is large, so that the whole laminated structure of the folding region needs to be subjected to simulation verification during design, the positions of the film layers such as a circuit layer and the like in a panel are ensured to be in a neutral layer, and the function is prevented from being influenced after bending.
In the use, can detect the thickness of the folding region of display screen 10 through detecting module 20, because the thickness in folding in-process folding region can change, the thickness of folding region is different under the angle of buckling of difference, folding region's angle of buckling and thickness have certain corresponding relation, consequently, can be based on folding region's thickness detects folding region's angle of buckling, can detect folding region and be in the angle of buckling under static bending state or the dynamic bending state, can acquire the fold condition of display screen, and then judge the running state at terminal to in order to confirm the automatic switch-over of functions such as whether the branch screen of screen is shielded.
In some embodiments, as shown in fig. 2, 7 and 9, the detection module 20 may include: piezoelectric layer 23 can be established at one side of display screen 10 and be located the folding region, and piezoelectric layer 23 can paste the surface at one side of display screen 10, and piezoelectric layer 23 can set up in the local of folding region or cover at whole folding region to can accurately detect the thickness in folding region. The electrodes may be connected to the piezoelectric layer 23, a voltage may be applied to the piezoelectric layer 23 through the electrodes and/or an electrical signal generated by the piezoelectric layer 23 may be transmitted, the piezoelectric layer 23 may generate an ultrasonic wave when the voltage is applied to the piezoelectric layer 23 through the electrodes, the piezoelectric layer 23 may generate 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 obtained, and the thickness of the folded area may be detected according to the time interval. The first detection module can be used for detecting the electric signal generated by the piezoelectric layer 23, the first detection module can detect the thickness of the folding area of the display screen 10 according to the electric signal, and the second detection module can detect the bending angle of the folding area according to the thickness of the folding area.
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 and then send out ultrasonic waves, and the mechanical vibration caused by the reflected ultrasonic signal can be converted into an electrical signal and 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 screen stack is different from that of air by orders of magnitude, so that the ultrasonic waves are almost totally reflected at the interface between the display screen and the air, which causes the ultrasonic waves emitted from the piezoelectric layer 23 to be almost completely reflected back to the piezoelectric layer 23, and at this time, the time for the piezoelectric layer 23 to generate the ultrasonic waves and the ultrasonic waves to be reflected to the piezoelectric layer 23 depends on the material and the thickness of the film layer. When a finger touches the other side of the display screen 10, the fingerprint ridge part is in contact with the display screen 10, the sound resistance of the finger is close to that of the display screen 10, most sound waves are transmitted through the display screen 10 to reach the finger, signals reflected by the display screen 10 back to the piezoelectric layer are weakened, and the time for the ultrasonic wave to return can be used for detecting the thickness of the folding area of the display screen 10.
In other embodiments, the first detection module is further configured to detect an image of the fingerprint stopping at 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 the image of the fingerprint stopping at 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 part contacts the display screen 10, the sound resistance of the finger is close to that of the display screen 10, most sound waves are transmitted through the display screen 10 to reach the finger, signals reflected back to the piezoelectric layer by the display screen 10 are weakened, the intensity and time of ultrasonic waves reflected back from different positions are different, and a pattern of the fingerprint abutting against the other side of the display screen 10 can be obtained by comparing the difference of the signals at the different positions. Can detect folding regional thickness and then judge folding regional angle of buckling through detecting the module, can also acquire the pattern of the fingerprint at the opposite side of display screen 10 simultaneously, be in the same place two kinds of function integration, reduced extra screen angle sensor of buckling, reduce occupation, reduce cost in space.
In the embodiment of the present application, the electrical signal may include a first electrical signal and a second electrical signal, the first electrical signal is different from the second electrical signal in frequency, the first detection module may detect the thickness of the folding area of the display screen 10 according to the first electrical signal, and the first detection module detects the image of the fingerprint stopped at the other side of the display screen 10 according to the second electrical signal, for example, the first detection module detects the image of the fingerprint stopped at the other side of the display screen 10 according to the intensity of the second electrical signal. At ultrasonic wave fingerprint identification and folding regional thickness detection in-process, can adopt the signal of telecommunication of different frequencies, the timesharing drive, first detection module can detect the thickness of the folding region of display screen 10 according to first signal of telecommunication, can detect the image of ending the fingerprint of the opposite side at display screen 10 according to the second signal of telecommunication, and the signal of telecommunication through different frequencies detects the thickness of folding region and the image of fingerprint can improve the accuracy that detects.
In some embodiments, the electrodes can be used to input a first voltage to the piezoelectric layer 23 such that the piezoelectric layer 23 can generate a first electrical signal, and the electrodes can be used to input a second voltage to the piezoelectric layer 23 such that the piezoelectric layer 23 can generate a second electrical signal, the first voltage being at a different frequency than the second voltage. For example, the electrodes 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 electrodes can input a second voltage to the piezoelectric layer 23 to cause the piezoelectric layer 23 to generate ultrasonic waves of a second frequency, which when reflected to the piezoelectric layer 23 causes the piezoelectric layer 23 to generate a second electrical signal. For example, a previous period of time allows the piezoelectric layer 23 to emit an ultrasonic signal of frequency a, and a subsequent period of time allows the piezoelectric layer to emit an ultrasonic signal of frequency b, 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 area.
In the application process, the electrodes can input voltage signals to the piezoelectric layer 23 to enable the piezoelectric layer 23 to 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 emitted by the piezoelectric layer 23 and the reflected ultrasonic waves are received can be obtained through the electric signals, images of fingerprints 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, 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 intensity of the ultrasonic wave reflected to the piezoelectric layer 23 may be acquired by the first electrical signal, and an image of a 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 an ultrasonic wave with a second frequency, when the ultrasonic wave with the second frequency is reflected to the piezoelectric layer 23, the piezoelectric layer 23 can generate a second electric signal, a time interval between the ultrasonic wave emitted by the piezoelectric layer 23 and the reflected ultrasonic wave received can be obtained through the second electric signal, 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.
In an embodiment of the present application, as shown in fig. 2, 3, 7 and 9, the electrode may include: the display device comprises a first electrode 21, a second electrode 22 and a circuit layer 24, wherein the first electrode 21 and the second electrode 22 are 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 arranged on two sides of the piezoelectric layer 23, the circuit layer 24 can be connected with the first electrode 21 and the second electrode 22, electric signals can be input into the first electrode 21 and the second electrode 22 through the circuit layer 24, and electric signals generated by the piezoelectric layer 23 can be 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 electrode 22 may be a metal electrode layer, each electrode may be independently controlled by adjusting a timing sequence, electrical signals in different position areas may be detected, the thickness of the folding area may be accurately detected, and an accurate fingerprint image may be obtained.
In some embodiments, as shown in fig. 2, 7 and 9, the display panel may further include: 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 protective layer 30 may protect the piezoelectric layer 23 and the second electrode 22. The display panel may further include: an adhesive layer 40, the adhesive layer 40 may be disposed between the display panel 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 attached to the surface of the display screen 10, and the adhesive layer 40 may be Optical Clear Adhesive (OCA), thermal sensitive adhesive (PSA), optical liquid adhesive or optical clear adhesive (OCR). The adhesive layer 40 may be a flexible material such as a flexible organic substrate of polyimide (CPI), polyester resin (PET), or cycloolefin polymer (COP), or a bendable ultra-thin glass such as ultra-thin glass (UTG).
In some embodiments, the display panel further comprises: the adhesive layer 40, the adhesive layer 40 sets up between display screen 10 and piezoelectric layer 23, first electrode 21 is located between adhesive layer 40 and piezoelectric layer 23 with circuit layer 24, the folding region of display screen 10, adhesive layer 40, the gross thickness of first electrode 21 and circuit layer 24 can be detected according to the signal of telecommunication that piezoelectric layer 23 produced to first detection module, the second detects the bending angle that the module can detect the folding region according to the folding region of display screen 10, adhesive layer 40, the gross thickness of first electrode 21 and circuit layer 24. As shown in fig. 7, the ultrasonic waves pass through the folding region of the display screen 10, the adhesive layer 40, the first electrode 21 and the circuit layer 24 during 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 folding 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 during the process of detecting the thickness, the accuracy of thickness detection can be improved, and the accuracy of the bending angle of the folding region can be further improved.
Optionally, the first detection 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 detection 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 extremely small relative to the thickness of the folding area of the display screen 10, if in the process of detecting the thickness, the thickness of the first electrode 21 is considered to improve the accuracy of the thickness detection, and further improve the accuracy of the bending angle of the folding area.
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 total thickness of the folding area of the display screen 10, the first electrode 21 and the circuit layer 24 according to an electrical signal, and the second detection module can detect the bending angle of the folding area according to the total thickness of the folding area of the display screen 10, the first electrode 21 and the circuit layer. Although the thicknesses of the first electrode 21 and the circuit layer 24 are extremely small relative to the thickness of the folding 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 folding 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, and the accuracy of the bending angle of the folding area is further improved. As shown in fig. 8, the detection module can cover the whole folding area, the whole module can be divided into a functional area 102 and a non-functional area 101, 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 can be connected with a circuit layer 24, the thicknesses of the circuit layer 24 and the electrodes are negligible relative to the thicknesses of the piezoelectric layer 23 and the adhesive layer, and the adjustment of the bending neutral layer and the selection of the film thickness can be easier.
As shown in fig. 7, during detection, ultrasonic waves upwards and downwards are emitted through the piezoelectric layer 23 at the same time, transmission B and reflection C can occur on the surface of the display screen 10 for the ultrasonic wave a propagating upwards, the ridge and the valley of the fingerprint mainly affect the intensity of ultrasonic wave reflection, the reflection of the part contacted by the ridge is weak, the part contacted by the valley is almost totally reflected, the intensity of the ultrasonic wave B reflected back to the piezoelectric layer 23 is obviously different, and therefore the intensity of an induced electrical signal generated by the piezoelectric layer 23 is affected, and the first detection module can obtain an image of the fingerprint by drawing a graph reflecting the reflection intensity. The ultrasonic wave D emitted downwards has no medium after reaching the boundary, so that the ultrasonic wave is almost totally reflected, and therefore, after the ultrasonic wave passes through the sections D and E, the piezoelectric layer 23 has an obvious piezoelectric signal, and because the thickness of the medium layer below the piezoelectric layer 23 is obviously smaller than the film layers above, such as a display screen, a cover plate and the like, the time of the piezoelectric signal is obviously distinguished from that of the electric signal above, and the probability of interference is lower. 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 emission to the reception of the ultrasonic waves is shortened, the thickness is reduced along with the increase of the bending angle, the time delta t between the emission and the reception of the ultrasonic waves is gradually reduced, and the relation between the thickness and the bending angle can be shown in fig. 5. The fingerprint can all be measured through the ultrasonic signal AC of display screen upside with the angle of buckling, can measure the intensity of ultrasonic wave, can draw the fingerprint image through the intensity of the piezoelectricity electric signal that detects the echo signal production that the piezoelectric layer received, can measure the thickness of rete through gathering echo signal and transmitting ultrasonic wave's time difference, can detect the angle of buckling through thickness.
The embodiment of the application provides a method for detecting a folding area bending angle 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 folding region of display screen 10 in can detecting display panel, for example, can measure thickness through the ultrasonic detector, also can detect the thickness of folding region through other instruments or methods according to actual conditions, and the detection module can detect the angle of buckling of folding region according to the thickness of folding region. In the use, can detect the thickness of the folding region of display screen 10 through detecting the module, because the thickness in folding in-process folding region can change, folding region's thickness is different under the angle of buckling of difference, folding region's angle of buckling and thickness have certain corresponding relation, consequently, can detect according to folding region's thickness folding region's angle of buckling, can detect folding region and be in the angle of buckling under static bending state or the dynamic bending state, can acquire the fold condition of display screen, and then judge the running state at terminal.
Optionally, the detection module may include: the display screen comprises a piezoelectric layer 23, electrodes, a first detection module and a second detection module, wherein the piezoelectric layer 23 can be arranged on one side of the display screen 10 and is located in a folding area. The electrodes may be connected to the piezoelectric layer 23, the electrodes may apply a voltage to the piezoelectric layer 23 and/or transmit an electrical signal generated by the piezoelectric layer 23, the piezoelectric layer 23 may generate an ultrasonic wave when the voltage is applied to the piezoelectric layer 23, 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 the thickness of the folding area of the display screen 10 according to the electrical signal, and the second detection module may detect the bending angle of the folding area according to the thickness of the folding area.
Alternatively, an image of a fingerprint against the other side of the display screen 10 may be detected from the electrical signal generated by the piezoelectric layer 23. For example, the image of the fingerprint that is against the other side of the display screen 10 can be detected by the first detection module according to the electrical signal generated by the piezoelectric layer 23.
Alternatively, the electrical signal 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 folding area of the display screen 10 may be detected based on the first electrical signal, and the image of the fingerprint abutting on the other side of the display screen 10 may be detected based on the second electrical signal. In the thickness testing process of ultrasonic wave fingerprint discernment and folding region, can adopt the signal of telecommunication of different frequencies, the timesharing drive, for example, first detection module can detect the thickness of the folding region of display screen 10 according to first signal of telecommunication, can detect the image of the fingerprint of ending at the opposite side of display screen 10 according to the second signal of telecommunication, and the signal of telecommunication through different frequencies detects the thickness of folding region and the image of fingerprint can improve the accuracy that detects.
Alternatively, a first voltage may be input to the piezoelectric layer 23 so that the piezoelectric layer 23 can generate a first electrical signal, and a second voltage may be input to the piezoelectric layer 23 so that the piezoelectric layer 23 can generate a second electrical signal, the first voltage having a different frequency than the second voltage. For example, the electrodes may input a first voltage to the piezoelectric layer 23 such 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 electrodes can input a second voltage to the piezoelectric layer 23 to cause the piezoelectric layer 23 to generate ultrasonic waves of a second frequency that are reflected to the piezoelectric layer 23 to cause the piezoelectric layer 23 to 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 above 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.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A display panel, comprising:
a display screen having a fold-over 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.
2. The display panel of claim 1, wherein the detection module comprises:
the piezoelectric layer is arranged on one side of the display screen and is positioned in the folding area;
electrodes 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 the first detection module detects the thickness of the folding area of the display screen according to the electric signal;
and the second detection module is used for detecting the bending angle of the folding area according to the thickness of the folding area.
3. The display panel according to claim 2, wherein the first detection module is further configured to detect an image of a fingerprint abutting on the other side of the display screen according to the electrical signal generated by the piezoelectric layer.
4. The display panel according to claim 3, wherein the electrical signals comprise a first electrical signal and a second electrical signal, and the first detection module detects the thickness of the folding area 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.
5. The display panel according to claim 4, wherein the electrode is configured 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.
6. The display panel according to claim 2, wherein the electrode comprises:
the first electrode is arranged on one side of the piezoelectric layer close to the display screen;
the second electrode is arranged on one side of the piezoelectric layer far away from the display screen;
a circuit layer connected to the first electrode and the second electrode, respectively.
7. The display panel according to claim 6, wherein the electrode comprises a plurality of the first electrodes, and the plurality of the first electrodes are distributed in an array; and/or
The display panel further includes:
the protective layer is arranged on one side, far away from the display screen, of the piezoelectric layer and covers the second electrode; and/or
Further comprising:
the bonding layer is arranged between the display screen and the piezoelectric layer, and the first electrode and the circuit layer are located between the bonding layer and the piezoelectric layer.
8. The display panel according to claim 6, 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
The first detection module detects the folding area of the display screen and the total thickness of 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
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 total thickness of the folding area of the display screen, the first electrode and the circuit layer.
9. A method for detecting a bending angle of a folding area of a display panel is characterized by comprising 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.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 8.
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| CN113838373B (en) | 2023-10-24 |
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