CN108845323B - Panel and method for determining position of target object by using panel - Google Patents
Panel and method for determining position of target object by using panel Download PDFInfo
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- CN108845323B CN108845323B CN201810404398.3A CN201810404398A CN108845323B CN 108845323 B CN108845323 B CN 108845323B CN 201810404398 A CN201810404398 A CN 201810404398A CN 108845323 B CN108845323 B CN 108845323B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/42—Simultaneous measurement of distance and other co-ordinates
Abstract
Embodiments of the invention disclose a panel and a method of using the panel to determine a position of a target object. The panel includes a substrate, an ultrasonic wave transmitting sensor, an ultrasonic wave receiving sensor, and a detection circuit over the substrate. The ultrasonic wave transmitting sensor is configured to transmit an ultrasonic wave signal. The ultrasonic wave receiving sensor is configured to receive an ultrasonic wave signal. The detection circuit is electrically coupled to the ultrasonic wave transmitting sensor and the ultrasonic wave receiving sensor, and is configured to detect a phase difference between the transmitted ultrasonic wave signal and the received ultrasonic wave signal.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a panel, a method of determining a position of a target object using the panel, and a display device.
Background
Currently, a camera mainly extracts depth information through a binocular structure, light sensing, and the like. However, since the camera has a large volume, high machining requirements and is difficult to integrate, it is difficult to apply the camera to application scenarios and high-performance products with severe volume requirements.
Gesture interaction is the use of computer graphics and other techniques to recognize human body language and convert it to commands to operate the device. Gesture interaction is a new man-machine interaction mode following mouse, keyboard and touch screen. Generally, a silicon-based ultrasonic transduction micro-electro-mechanical system (MEMS) array is used to transmit and receive ultrasonic waves, detect a gesture position, and perform gesture recognition.
Disclosure of Invention
Embodiments of the present invention provide a panel, a method of determining a position of a target object using the panel, and a display apparatus, which can implement integration of a function for detecting the position of the target object in the panel.
According to a first aspect of the present invention, a panel is provided. The panel may include a substrate, an ultrasonic wave transmitting sensor, an ultrasonic wave receiving sensor, and a detection circuit over the substrate. The ultrasonic wave transmitting sensor is configured to transmit an ultrasonic wave signal. The ultrasonic wave receiving sensor is configured to receive an ultrasonic wave signal. The detection circuit is electrically coupled to the ultrasonic wave emitting sensor and the ultrasonic wave receiving sensor, and is configured to detect a phase difference between the emitted ultrasonic wave signal and the received ultrasonic wave signal.
In an embodiment of the present invention, the detection circuit may include a first reset circuit, a first control circuit, a first capacitor, a first reading circuit, a second reset circuit, a second control circuit, a second capacitor, a second reading circuit, and a processing circuit. The first reset circuit is configured to reset a voltage of the first node according to a first reset signal. The first control circuit is configured to transmit the electric signal generated by the ultrasonic wave receiving sensor to the first node according to a first control signal. The first capacitor is configured to store a voltage of a first node. The first reading circuit is configured to read a voltage of the first node according to the first switching signal. The second reset circuit is configured to reset a voltage of the second node according to a second reset signal. The second control circuit is configured to transmit the electric signal generated by the ultrasonic wave receiving sensor to the second node according to a second control signal. The second capacitor is configured to store a voltage of the second node. The second reading circuit is configured to read a voltage of the second node according to the second switching signal. The processing circuit is configured to generate a first control signal, a second control signal, and a third control signal for controlling the ultrasonic wave signal, and calculate a phase difference between the transmitted ultrasonic wave signal and the received ultrasonic wave signal from the read voltage of the first node and the voltage of the second node.
In an embodiment of the invention, the processing circuitry is further configured to calculate a distance between the target object and the panel from the calculated phase difference.
In an embodiment of the present invention, the first reset circuit may include a first transistor. The first transistor has a control electrode coupled to a first reset signal, a first electrode coupled to a first voltage terminal, and a second electrode coupled to a first node. The second reset circuit includes a second transistor. The control electrode of the second transistor is coupled with the second reset signal, the first electrode is coupled with the first voltage end, and the second electrode is coupled with the second node.
In an embodiment of the present invention, the first control circuit includes a third transistor. The third transistor has a control electrode coupled to the first control signal, a first electrode coupled to the ultrasonic receiving sensor, and a second electrode coupled to the first node. The second control circuit includes a fourth transistor. A control electrode of the fourth transistor is coupled to the second control signal, a first electrode of the fourth transistor is coupled to the ultrasonic receiving sensor, and a second electrode of the fourth transistor is coupled to the second node.
In an embodiment of the present invention, the first reading circuit includes a fifth transistor, a sixth transistor, and a first current source. The fifth transistor has a control electrode coupled to the first node, a first electrode coupled to the second voltage terminal, and a second electrode coupled to the sixth transistor. The control electrode of the sixth transistor is coupled to the first switching signal, the first electrode is coupled to the fifth transistor, and the second electrode is coupled to the first output terminal. The first current source is coupled between the first output terminal and the third voltage terminal. The second read circuit includes a seventh transistor, an eighth transistor, and a second current source. The seventh transistor has a control electrode coupled to the second node, a first electrode coupled to the second voltage terminal, and a second electrode coupled to the eighth transistor. The eighth transistor has a control electrode coupled to the second switching signal, a first electrode coupled to the seventh transistor, and a second electrode coupled to the second output terminal. The second current source is coupled between the second output terminal and the third voltage terminal.
In an embodiment of the present invention, the panel further comprises a convergence layer disposed over the ultrasonic wave receiving sensor. The convergence layer is configured to converge the ultrasonic signal to be provided to the ultrasonic receiving sensor.
In an embodiment of the invention, the concentrating layer is a prismatic film layer.
In an embodiment of the present invention, an ultrasonic wave emission sensor includes: the piezoelectric device includes a first drive electrode layer, a second drive electrode layer, and a first piezoelectric layer disposed between the first drive electrode layer and the second drive electrode layer.
In an embodiment of the present invention, an ultrasonic wave receiving sensor includes: the piezoelectric sensor includes a first sensing electrode layer, a second sensing electrode layer, and a second piezoelectric layer disposed between the first sensing electrode layer and the second sensing electrode layer.
In the embodiment of the invention, the ultrasonic transmitting sensor and the ultrasonic receiving sensor are arranged in the same layer.
In an embodiment of the present invention, a panel includes a plurality of pixel units, a plurality of ultrasonic wave transmitting sensors, and a plurality of ultrasonic wave receiving sensors. The plurality of ultrasonic wave transmitting sensors are disposed around the plurality of ultrasonic wave receiving sensors. The orthographic projection of the multiple ultrasonic transmitting sensors and the orthographic projection of the multiple ultrasonic receiving sensors on the substrate do not overlap with the orthographic projection of the multiple pixel units on the substrate.
According to a second aspect of the present invention there is provided a method of determining the position of a target object using the panel of the first aspect of the present invention. In the method, an ultrasonic signal is transmitted. An ultrasonic signal reflected by the target object is received. Then, a phase difference between the transmitted ultrasonic signal and the received ultrasonic signal is detected based on the first control signal and the second control signal for determining the position of the target object. The first control signal and the second control signal differ by one-half period.
In an embodiment of the present invention, the ultrasonic signals are transmitted in a first timing sequence. The detection comprises the following steps: a first read voltage corresponding to the received ultrasonic signal is detected based on the first control signal. A second read voltage corresponding to the received ultrasonic signal is detected based on a second control signal. A phase difference between the transmitted ultrasonic signal and the received ultrasonic signal is calculated based on the first read voltage and the second read voltage. The phase of the first control signal is the same as the phase of the first timing, and the phase of the second control signal is different from the phase of the first timing by one-half cycle.
In an embodiment of the present invention, in a first period, an ultrasonic signal is transmitted, a first read voltage corresponding to the received ultrasonic signal is detected according to a first control signal, and a second read voltage corresponding to the received ultrasonic signal is detected according to a second control signal. In the second period, the ultrasonic signal is not emitted, the third read voltage is detected according to the first control signal, and the fourth read voltage is detected according to the second control signal. Then, a phase difference between the transmitted ultrasonic wave signal and the received ultrasonic wave signal is calculated from the first read voltage, the second read voltage, the third read voltage, and the fourth read voltage.
In an embodiment of the present invention, the ultrasonic signals are transmitted in a first timing sequence. The detection comprises the following steps: in the first period, a first read voltage corresponding to the received ultrasonic signal is detected based on a first control signal having the same phase as that of the first timing, and a second read voltage corresponding to the received ultrasonic signal is detected based on a second control signal having a phase lagging by one-half cycle from that of the first timing. In the second period, a third read voltage corresponding to the received ultrasonic signal is detected based on the first control signal, the phase of which lags behind the phase of the first timing by a quarter cycle, and a fourth read voltage corresponding to the received ultrasonic signal is detected based on the second control signal, the phase of which lags behind the phase of the first timing by a three-quarter cycle. In the third period, the first control signal, the phase of which lags behind the phase of the first timing by one-half cycle, detects a fifth read voltage corresponding to the received ultrasonic signal, and detects a sixth read voltage corresponding to the received ultrasonic signal according to the second control signal, the phase of which is the same as the phase of the first timing. In a fourth period, a seventh read voltage corresponding to the received ultrasonic signal is detected based on the first control signal, the phase of which lags behind the phase of the first timing by three-quarters of a cycle, and an eighth read voltage corresponding to the received ultrasonic signal is detected based on the second control signal, the phase of which lags behind the phase of the first timing by one-quarter of a cycle. Then, a phase difference between the transmitted ultrasonic wave signal and the received ultrasonic wave signal is calculated from the first read voltage, the second read voltage, the third read voltage, the fourth read voltage, the fifth read voltage, the sixth read voltage, the seventh read voltage, and the eighth read voltage.
In an embodiment of the invention, the method further comprises: calculating a distance between the target object and the panel according to the detected phase difference.
According to a third aspect of the present invention, there is provided a display device. The display device comprises the panel of the first aspect of the invention.
According to the embodiment of the invention, the ultrasonic sensor is manufactured in the panel on the basis of the original TFT process, so that the function of identifying the position of an object is realized, and the process is simple to realize. Through the screen integration of the sensor, the cost can be reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings of the embodiments will be briefly described below. It is to be understood that the drawings described below are for purposes of illustrating certain embodiments of the invention only and are not to be construed as limiting the invention. In the drawings, like numerals refer to the same or similar structures. In the drawings:
FIG. 1 shows a schematic view of a panel according to an embodiment of the invention;
FIG. 2 shows a schematic view of a panel according to another embodiment of the invention;
FIG. 3 shows a schematic block diagram of a detection circuit according to an embodiment of the invention;
FIG. 4 shows an exemplary circuit diagram of a detection circuit according to an embodiment of the invention;
FIG. 5 shows a schematic of the transmission and reception of ultrasonic signals over time according to an embodiment of the invention;
FIG. 6 shows a timing diagram of an example of signals used in a panel according to an embodiment of the invention;
FIG. 7 shows a timing diagram of another example of signals used in a panel according to an embodiment of the invention;
FIG. 8 shows a flow diagram of a method of determining a position of a target object according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the described embodiments without any inventive step, also belong to the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the machine or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Generally, the performance of a glass-based image sensor is poor compared with the photosensitive capability of a silicon-based sensor, and the gray scale response capability of the silicon-based sensor is difficult to achieve. In addition, the light propagation speed is very fast, which requires the performance of the backplane circuit of the panel to be very high, and is a very great challenge for the design of the pixel circuit. Currently, the functional modules for identifying the position of the target object are separate from the display screen, and such functional modules are not integrated within the display screen. For example, the function module of gesture recognition is completely external and is not integrated with the display screen. It will be appreciated by those skilled in the art that the target object described herein is not limited to a hand, but may be other objects.
The embodiment of the invention provides a method for manufacturing a piezoelectric sensor (ultrasonic sensor) array on a glass-based backboard process, and calculating the position information of a target object according to an ultrasonic signal, thereby realizing the functions of position identification and the like of the target object.
Fig. 1 shows a schematic view of a panel 100 according to an embodiment of the invention. As shown in fig. 1, the panel 100 may include a substrate 110, a detection circuit 120 on the substrate 110, and an ultrasonic wave transmitting sensor 130 and an ultrasonic wave receiving sensor 140 on the detection circuit 120. The substrate 110 may be, for example, a glass substrate, a flexible substrate, or the like.
The ultrasonic wave transmitting sensor 130 may transmit an ultrasonic wave signal, and the ultrasonic wave receiving sensor 140 may receive an ultrasonic wave signal reflected by a target object, for example. The detection circuit 120 is electrically coupled with the ultrasonic wave transmitting sensor 130 and the ultrasonic wave receiving sensor 140, and can detect a phase difference between the transmitted ultrasonic wave signal and the received ultrasonic wave signal.
The principle of the piezoelectric ultrasonic sensor is as follows: the ultrasonic wave transmission mode utilizes the reverse voltage effect, a voltage pulse signal is applied between electrodes, the piezoelectric layer is deformed, and when the frequency of the voltage pulse signal is equal to the natural frequency of the piezoelectric layer material, resonance occurs, and the peripheral cut-off vibration of the piezoelectric layer is caused to generate ultrasonic waves. The ultrasonic receiving mode utilizes the forward piezoelectric effect, and when the frequency of ultrasonic waves received by the piezoelectric layer is consistent with the natural frequency of the material of the piezoelectric layer, the piezoelectric layer can deform to generate high-frequency voltage.
In the embodiment of the present invention, each of the ultrasonic wave transmission sensor 130 and the ultrasonic wave reception sensor 140 may be a three-layer structure. Specifically, the ultrasonic wave emission sensor 130 may include a first driving electrode layer, a second driving electrode layer, and a first piezoelectric layer disposed between the first driving electrode layer and the second driving electrode layer. The ultrasonic wave receiving sensor 140 may include a first sensing electrode layer, a second sensing electrode layer, and a second piezoelectric layer disposed between the first sensing electrode layer and the second sensing electrode layer. The first driving electrode layer, the second driving electrode layer, the first sensing electrode layer and the second sensing electrode layer may be made of Al, Mo, Cu, AlNd, or MoAlMo. The first piezoelectric layer and the second piezoelectric layer can be made of a piezoelectric material such as polyvinylidene fluoride (PVDF).
In fig. 1, the ultrasonic wave transmitting sensor 130 and the ultrasonic wave receiving sensor 140 are disposed in the same layer. In other embodiments of the present invention, the ultrasonic transmission sensor 130 may also be disposed above the ultrasonic reception unit 140.
In an embodiment of the present invention, the panel 100 may include a plurality of ultrasonic wave transmitting sensors 130 and a plurality of ultrasonic wave receiving sensors 140. The plurality of ultrasonic wave transmitting sensors 130 are disposed around the plurality of ultrasonic wave receiving sensors 140.
Fig. 2 shows a schematic view of a panel 200 according to another embodiment of the invention. As shown in fig. 2, the panel 200 includes a substrate 110, a first insulating layer I1 over the substrate 110, a detection circuit 120 and a pixel circuit 260 over a first insulating layer I1, a second insulating layer I2 over the detection circuit 120 and the pixel circuit 260, an ultrasonic wave transmission sensor 130 and an ultrasonic wave reception sensor 140 and a pixel unit 270 over a second insulating layer I2, and a convergence layer 150 over the ultrasonic wave reception sensor 140. The pixel unit 270 may be, for example, a light emitting diode LED, an organic light emitting diode OLED, an active matrix organic light emitting diode AMOLED pixel unit, or the like. The pixel circuit 260 may be, for example, a TFT pixel driving circuit or the like.
In an embodiment of the present invention, the focusing layer 150 may be used to focus the ultrasonic signal entering the panel 200 and provide it to the ultrasonic wave receiving sensor 140. According to one embodiment, the condensing layer 150 may include a prism film disposed at a position corresponding to the orthographic projection of the ultrasonic wave receiving sensor 140.
As shown in fig. 2, the panel 200 may include an effective display area AA having pixel units 270 and a non-display area NA. The ultrasonic wave transmitting sensor 130 and the ultrasonic wave receiving sensor 140 may be disposed at the non-display area NA of the panel 200. Alternatively, the ultrasonic wave transmitting sensor 130 and the ultrasonic wave receiving sensor 140 may also be disposed between the pixel units 270 of the effective display area AA. The embodiment of the present invention does not specifically limit the positions of the ultrasonic wave transmitting sensor 130 and the ultrasonic wave receiving sensor 140 as long as the display effect is not affected. Specifically, the orthographic projections of the ultrasonic wave transmission sensor 130 and the ultrasonic wave reception sensor 140 on the substrate do not overlap with the orthographic projections of the pixel units 270 of the panel on the substrate.
In addition, the detection circuit 120 may be disposed at the same layer as the pixel circuit 260 in the panel 200. Specifically, the detection circuit 120 may be disposed at a peripheral region of the panel 200. The detection circuit 120 is correspondingly coupled with the ultrasonic wave transmission sensor 130 and the ultrasonic wave reception sensor 140 via the via hole of the second insulation layer I2.
According to the embodiment of the present invention, when a target object (for example, a hand) is present in the detection range of the ultrasonic wave sensor (the ultrasonic wave transmitting sensor 130 and the ultrasonic wave receiving sensor 140), transmission occurs when an ultrasonic wave signal transmitted by the ultrasonic wave transmitting sensor reaches the hand. The reflected ultrasonic signals are converged by the prism and then received by the ultrasonic receiving sensor. Then, according to the phase difference between the transmitted and received ultrasonic signals, the round-trip time of the ultrasonic signal can be calculated, and finally the distance from a certain point on the target object to the screen can be calculated. In embodiments of the present invention, the ultrasonic sensors on the panel may be an array of sensors, and thus a depth image may be determined for the target object.
FIG. 3 illustrates an exemplary block diagram of a detection circuit according to an embodiment of the present invention. As shown in fig. 3, the detection circuit 120 may include a first reset circuit 310, a first control circuit 312, a first capacitor 314, a first readout circuit 316, a second reset circuit 320, a second control circuit 322, a second capacitor 324, a second readout circuit 326, and a processing circuit 330. Wherein, the first control circuit 312 and the second control circuit 322 are electrically coupled with the ultrasonic receiving sensor 140 respectively. Each circuit is described in detail below.
The first reset circuit 310 may be coupled to the first reset signal Sr1, the first voltage terminal Vr, and the first node N1, for resetting a voltage of the first node N1 according to a voltage provided by the first voltage terminal Vr under the control of the first reset signal Sr 1. The first control circuit 312 may be coupled to the first control signal Sc1, the ultrasonic receiving sensor 140 and the first node N1 for transferring the electrical signal generated by the ultrasonic receiving sensor 140 to the first node N1 under the control of the first control signal Sc 1. The first capacitor 314 may have one end coupled to the first node N1 and the other end coupled to ground for storing the voltage at the first node N1. The first reading circuit 316 may be coupled to the first node N1, the first switching signal Ss1, the second voltage terminal VDD, the third voltage terminal VSS, and the first output terminal T1, and configured to read the voltage of the first node N1 from the first output terminal T1 under the control of the first switching signal Ss 1.
The second reset circuit 320 may be coupled to the second reset signal Sr2, the first voltage terminal Vr, and the second node N2, and configured to reset the voltage of the second node N2 according to the voltage provided by the second voltage terminal Vr under the control of the second reset signal Sr 2. The second control circuit 322 may be coupled to the second control signal Sc2, the ultrasonic receiving sensor 140 and the second node N2 for transferring the electrical signal generated by the ultrasonic receiving sensor 140 to the second node N2 under the control of the second control signal Sc 2. The second capacitor 324 may have one terminal coupled to the second node N2 and the other terminal coupled to ground for storing the voltage at the second node N2. The second reading circuit 326 may be coupled to the second node N2, the second switching signal Ss2, the second voltage terminal VDD, the third voltage terminal VSS, and the second output terminal T2, and configured to read the voltage of the second node N2 from the second output terminal T2 under the control of the second switching signal Ss 2.
The processing circuit 330 may be coupled to the ultrasonic wave transmitting sensor 130, the first and second control circuits 312 and 322, the first and second output terminals T1 and T2, for generating a first control signal Sc1, a second control signal Sc2, and a third control signal for controlling a timing at which the ultrasonic wave transmitting sensor transmits the ultrasonic wave signal so as to control transmission and reception of the ultrasonic wave signal at different periods, and calculating a phase difference between the ultrasonic wave signal transmitted by the ultrasonic wave transmitting sensor 130 and the ultrasonic wave signal received by the ultrasonic wave receiving sensor 140 according to the read voltage of the first node N1 and the read voltage of the second node N2. Then, the calculated value may be output to the third output terminal T3.
Fig. 4 shows an exemplary circuit diagram of a detection circuit according to an embodiment of the present invention. In this embodiment, the circuit structures of the first reset circuit 310, the first control circuit 312, the first capacitor 314 and the first read circuit 316 are the same as the circuit structures of the second reset circuit 320, the second control circuit 322, the second capacitor 324 and the second read circuit 326, respectively, so as to reduce the measurement error generated due to the structural difference between the two sets of circuits during the detection process. In embodiments, the transistors employed may be N-type transistors or P-type transistors. In particular, the transistor may be an N-type or P-type field effect transistor (MOSFET), or an N-type or P-type bipolar transistor (BJT). In an embodiment of the present invention, the gate of the transistor is referred to as a control electrode. Since the source and the drain of the transistor are symmetrical, no distinction is made between the source and the drain, i.e., the source of the transistor may be the first pole (or the second pole) and the drain may be the second pole (or the first pole).
In the embodiment of the present invention, an N-type field effect transistor (PMOS) is taken as an example for detailed description.
As shown in fig. 4, the first reset circuit 310 may include a first transistor M1. The first transistor M1 has a control electrode coupled to the first reset signal Sr1, a first electrode coupled to the first voltage terminal Vr, and a second electrode coupled to the first node N1.
The second reset circuit 320 may include a second transistor M2. The control electrode of the second transistor M2 is coupled to the second reset signal Sr2, the first electrode is coupled to the first voltage terminal Vr, and the second electrode is coupled to the second node N2.
The first control circuit 312 may include a third transistor M3. The third transistor M3 has a control electrode coupled to the first control signal Sc1, a first electrode coupled to the ultrasonic receiving sensor 140, and a second electrode coupled to the first node N1.
The second control circuit 322 may include a fourth transistor M4. The fourth transistor M4 has a control electrode coupled to the second control signal Sc2, a first electrode coupled to the ultrasonic receiving sensor 140, and a second electrode coupled to the second node N2.
The first capacitor 314 may include a first capacitor Ca. The first capacitor Ca has one end coupled to the first node N1 and the other end grounded.
The second capacitor 324 may include a second capacitor Cb. The second capacitor Cb has one end coupled to the second node N2 and the other end grounded.
The first read circuit 316 may include a fifth transistor M5, a sixth transistor M6, and a first current source CS 1. The fifth transistor M5 has a control electrode coupled to the first node N1, a first electrode coupled to the second voltage terminal VDD, and a second electrode coupled to the sixth transistor M6. The sixth transistor M6 has a control electrode coupled to the first switching signal Ss1, a first electrode coupled to the second electrode of the fifth transistor M5, and a second electrode coupled to the first output terminal T1. The first current source CS1 is coupled between the first output terminal T1 and the third voltage terminal VSS.
The second reading circuit 326 may include a seventh transistor M7, an eighth transistor M8, and a second current source CS 2. The seventh transistor M7 has a control electrode coupled to the second node N2, a first electrode coupled to the second voltage terminal VDD, and a second electrode coupled to the eighth transistor M8. The eighth transistor M8 has a control electrode coupled to the second switching signal Ss2, a first electrode coupled to the second electrode of the seventh transistor M7, and a second electrode coupled to the second output terminal T2. The second current source CS2 is coupled between the second output terminal T2 and the third voltage terminal VSS.
Next, a detection process of the detection circuit provided by the embodiment of the present invention is specifically described in conjunction with transmission and reception of an ultrasonic signal.
In the case where the distance between the ultrasonic sensor (ultrasonic wave transmitting sensor and ultrasonic wave receiving sensor) and the target object is 0, once the ultrasonic wave transmitting sensor transmits an ultrasonic wave signal, the signal is immediately received by the corresponding ultrasonic wave receiving sensor. However, in general, the distance between the ultrasonic sensor and the target object is not 0, and therefore there is a time delay between transmission and reception of the ultrasonic signal. The time delay can be expressed as a phase difference between the two signals. Embodiments of the present invention determine depth information based on the phase difference.
Furthermore, those skilled in the art will appreciate that the first reset circuit 310 and the second reset circuit 320, the first control circuit 312 and the second control circuit 322, the first capacitor 314 and the second capacitor 324, and the first reading circuit 316 and the second reading circuit 326 may be implemented by different circuits.
FIG. 5 shows a schematic of the transmission and reception of ultrasonic signals over time in accordance with an embodiment of the present invention. As shown in fig. 5, in the period t0 to t2, the ultrasonic wave transmitting sensor transmits an ultrasonic wave signal whose amplitude linearly increases with time. Since there is a time delay (t0-t1) between the transmission and reception of the ultrasonic signal, the corresponding ultrasonic wave receiving sensor receives the ultrasonic signal reflected by the target object from the time period t1 and accumulates charges by the capacitance. Since the accumulated electric charge also increases linearly with time and the electric current corresponds to the differential of the electric charge with respect to time, it can be approximately considered that the ultrasonic wave receiving sensor 140 will receive an approximately constant electric current under excitation of the transmitted ultrasonic wave signal in a short time range. That is, the ultrasonic wave receiving sensor 140 may be regarded as a constant current source. Then, the transmission of the ultrasonic signal is stopped at time t 2. After a corresponding time delay (t2-t3), the ultrasonic signal is no longer received after time t 3. The time length of the time delay t0-t1 is equal to the time length of the time delay t2-t3
It is understood that the time delay (t0 to t1) represents a round trip period during which the ultrasonic signal actually travels. As the distance between the ultrasonic sensor and the target object increases, the time delay (t0 to t1) increases, and vice versa decreases.
During the period t0 to t2 in which the ultrasonic signal is transmitted, the electric charges actually received and accumulated are correlated with the time difference (t1 to t2) obtained by subtracting the time delay (t0 to t1) from the total period (t0 to t 2). Therefore, the farther the distance of the ultrasonic sensor from the target object, the longer the time delay, and the less ultrasonic signals are received within the transmission period (t0 to t 2). In contrast, the closer the distance of the ultrasonic sensor from the target object, the shorter the time delay and the more ultrasonic signals are received within the transmission period (t0 to t 2).
Based on the above and the detection circuit shown in fig. 3, the ultrasonic signal can be controlled to be transmitted by the processing circuit 330, and the ultrasonic signals received in different periods can be read under the control of the first control signal Sc1 and the second control signal Sc 2. From the voltage values read in different periods of time, the phase difference between the transmitted and received ultrasonic signals (correspondingly, the round trip time) can be calculated. Further, the distance between the target object and the panel can be determined according to the propagation speed S of the sound wave in the medium, for example, the speed of the sound wave in the air is 340 m/S.
The method of determining the phase difference by one measurement, two measurements and four measurements, respectively, provided according to an embodiment of the present invention is described in detail below.
One time measurement
Fig. 6 shows a timing diagram of an example of signals used in the panel according to an embodiment of the present invention. Wherein, the signals are respectively a third control signal L1 for controlling the ultrasonic wave transmitting sensor to transmit the ultrasonic wave signal, an actually received ultrasonic wave signal L2, a first control signal Sc1 and a second control signal Sc 2. In an embodiment of the present invention, one measurement may be made using the timing of the signals shown in FIG. 6.
As shown in fig. 6, the duty ratio of the third control signal L1 is 50%. During the high level period T of the third control signal L1, the ultrasonic wave transmitting sensor transmits an ultrasonic wave signal. The amplitude of the transmitted ultrasonic signal increases linearly with time, as shown in fig. 5, for example, so that the ultrasonic receiving transducer generates a constant current. From the above description, there is a time delay Trt between the L2 signal and the L1 signal, which can also be understood as the round trip time for the ultrasonic signal to travel. The first control signal Sc1 is clocked in the same way as the L1 signal, and the second control signal Sc2 is one-half cycle out of phase with the first control signal Sc 1.
According to the detection circuit shown in fig. 3 or 4, the first reset circuit 310 resets the voltage of the first node N1 to the first voltage Vr under the control of the first reset signal Sr 1. During the high level of the first control signal Sc1, the received electrical signal is passed through the first control circuit 312 to the first node N1. The voltage of the first node is stored through the first capacitor 314. Therefore, the amount of change in the voltage of the first node N1 corresponds to the ultrasonic signal received during the period T-Trt (shown by the hatched portion). Then, the voltage of the first node N1 (hereinafter, referred to as a first read voltage) Vo1 is read from the first output terminal T1 by the first read circuit 316 under the control of the first switching signal Ss 1.
The second reset circuit 320 resets the voltage of the second node N2 to the first voltage Vr under the control of the second reset signal Sr 2. During the high level of the second control signal Sc2, the received electrical signal is passed through the second control circuit 322 to the second node N2. The voltage of the second node is stored through the second capacitor 324. Therefore, the amount of change in the voltage of the second node N2 corresponds to the ultrasonic signal received during the period Trt (shown by the hatched portion). Then, the voltage of the second node N2 (hereinafter, referred to as a second read voltage) Vo2 is read from the second output terminal T2 by the second read circuit 326 under the control of the second switching signal Ss 2.
Then, the first read voltage Vo1 and the second read voltage Vo2 are transmitted to the processing circuit 330, and processed by the processing circuit 330, for example, as follows.
As described above, the ultrasonic receiving sensor can be equivalent to a constant current source, and thus the voltage change is time-dependent, and K is used to represent a correlation coefficient.
Vo1＝Vr–(T–Trt)*K
Vo2＝Vr–Trt*K
By calculation, K can be eliminated, giving:
phase difference Trt/2T (Vr-Vo 2)/(2 x (2 Vr- (Vo1+ Vo2)))
On the basis, the duration of the transmission period T can be known according to the frequency of the ultrasonic signal transmitted by the processing circuit 330, and the delay time Trt can be determined according to the first voltage Vr, the first reading voltage Vo1 and the second reading voltage Vo 2. Then, the distance between one point of the target object and the panel can be calculated to be S x Trt/2.
Further, the processing circuit 330 may transmit the ultrasonic signal multiple times and accordingly determine the distance between the panel and the multiple points of the target object. Thereby, the position information of the target object can be determined.
Second measurement
The read voltage value may be inaccurate due to the interference of ultrasonic waves in the environment and the error of initial reset when reset is performed. In an embodiment of the present invention, the ambient acoustic offset voltage Vax and the initial reset offset voltage Vox may be introduced, and the phase difference may be determined by a secondary measurement. The two periods of the secondary measurement are described below in conjunction with the detection circuits of fig. 3 and 4, and the timing sequence of fig. 6, respectively.
In a first period, the voltage reading can be performed with the timing of the signals shown in FIG. 6. Vaa is used to denote the ambient sound offset voltage of the first node N1, Vab is used to denote the ambient sound offset of the second node N2, and Voa is used to denote the initial reset offset voltage of the first node N1 and Vob is used to denote the initial reset offset voltage of the second node N2. In the first period, the first and second read voltages a1 and B1 are represented by:
A1＝Vaa+Voa+Vr–(T–Trt)x K
B1＝Vab+Vob+Vr–Trt x K
in the second period, the ultrasonic wave transmitting sensor does not transmit the ultrasonic wave signal. The voltage values are read directly from the first output terminal T1 and the second output terminal T2 according to the first control signal Sc1 and the second control signal Sc 2. In this way, the first read voltage a2 and the second read voltage B2 read in the second period can be represented as:
A2＝Vaa+Voa+Vr
B2＝Vab+Vob+Vr
calculated by the processing circuit 330, it can be found that:
A3＝A1–A2＝–(T–Trt)*K
B3＝B1–B2＝–Trt*K
Trt/T＝B3/(A3+B3)
from above, the two sets of read voltages are read by the secondary measurement, thereby calculating the distance between the target object and the panel. In this way, calculation errors due to the ambient sound offset voltage and the initial reset offset voltage can be avoided. Therefore, the obtained position information of the target object is more accurate.
It is to be understood that the terms "first time period" and "second time period" do not denote temporal order, and that the two may be performed in any order.
Four measurements
Since the sizes of the first capacitor Ca and the second capacitor Cb in the two circuits in the receiving pixel circuit may not be completely the same, the gains of the voltage changes respectively caused are also different. The gains of the voltage variations in the capacitances Ca and Cb may be expressed as Ga and Gb hereinafter. The process of determining the phase difference by four measurements is described below in conjunction with the timing sequence of fig. 7.
Fig. 7 shows a timing diagram of an example of signals used in a panel according to an embodiment of the present invention. The signals are a pulse signal L1 for controlling the emission of the ultrasonic wave signal, a first control signal Sc1 and a second control signal Sc2 respectively.
In the four measurements D1, D2, D3, and D4, the first control signal Sc1 and the L1 signal are 0 degrees, 90 degrees, 180 degrees, and 270 degrees out of phase, respectively. The first control signal Sc1 and the second control signal Sc2 are separated by one-half cycle. The detection process is similar to the above and is not described in detail. During the first measurement D1 respectively,reading a first read voltage A0And a second read voltage B0. During the second measurement D2, the first read voltage A is read90And a second read voltage B90. During the third measurement D3, the first read voltage A is read180And a second read voltage B180. During the fourth measurement D4, the first read voltage A is read270And a second read voltage B270. By sending it to the processing circuitry 330 and performing the calculations, the parametric relationship can be approximated as follows:
A0-B0＝(VAa+VOa+Vr)-(VAb+VOb+Vr)-(Ga+Gb)*2cos(Trt/T)
A180-B180＝(VAa+VOa+Vr)-(VAb+VOb+Vr)+(Ga+Gb)*2cos(Trt/T)
A90-B90＝(VAa+VOa+Vr)-(VAb+VOb+Vr)-(Ga+Gb)*2sin(Trt/T)
A270-B270＝(VAa+VOa+Vr)-(VAb+VOb+Vr)+(Ga+Gb)*2sin(Trt/T)
by calculation, it can be found that:
M＝(A0-B0)-(A180-B180)＝-(Ga+Gb)*4cos(Trt/T)
N＝(A90-B90)-(A270-B270)＝-(Ga+Gb)*4sin(Trt/T)
then, from Trt/T ═ artan (N/M), the phase difference between transmission and reception of the ultrasonic signal can be found. Further, a round-trip distance difference can be determined from the phase difference and a depth information value obtained.
By measuring four times, calculation errors due to different ambient sound offset voltages, initial reset offset voltages, and capacitance parameters can be avoided.
Fig. 8 shows a flow chart of a method of determining a position of a target object using a panel, such as the panels 100, 200 shown in fig. 1 or 2, according to an embodiment of the invention.
As shown in fig. 8, in step S810, the ultrasonic wave transmitting sensor 130 transmits an ultrasonic wave signal, for example, in a first timing. The first timing may be provided by a third control signal generated by the detection circuit 120. In step S820, the ultrasonic wave receiving sensor 140 receives the ultrasonic wave signal reflected by the target object. In step S830, the detection circuit 120 detects a phase difference between the transmitted ultrasonic signal and the received ultrasonic signal for determining the position of the target object, based on the first control signal and the second control signal. In the embodiment of the invention, the difference between the first control signal and the second control signal is half period.
In an embodiment of the present invention, the phase of the first control signal Sc1 is the same as the phase of the first timing, and the phase of the second control signal Sc2 is different from the phase of the first timing by one-half cycle, for example, referring to the timing of the signals shown in fig. 6, corresponding to one measurement described above. In the method, the detection circuit 120 detects a first read voltage corresponding to the received ultrasonic signal in accordance with the first control signal Sc 1. The detection circuit 120 detects a second read voltage corresponding to the received ultrasonic signal based on the second control signal Sc 2. Then, the detection circuit 120 calculates a phase difference between the transmitted ultrasonic signal and the received ultrasonic signal from the first read voltage and the second read voltage.
In another embodiment of the present invention, secondary measurements may also be used to determine the phase difference. Accordingly, the two measurements are divided into a first period and a second period.
Specifically, in the first period, an ultrasonic signal is transmitted. The detection circuit 120 detects a first read voltage corresponding to the received ultrasonic signal from the first output terminal T1 of the detection circuit 120 according to the first control signal. The detection circuit 120 detects a second read voltage corresponding to the received ultrasonic signal from the second output terminal T2 of the detection circuit according to the second control signal.
During the second period, no ultrasonic signal is emitted. The detection circuit 120 detects the third read voltage from the first output terminal T1 according to the first control signal. The detection circuit 120 detects the fourth read voltage from the second output terminal T2 of the detection circuit according to the second control signal.
Then, the detection circuit 120 calculates a phase difference between the transmitted ultrasonic wave signal and the received ultrasonic wave signal from the first read voltage, the second read voltage, the third read voltage, and the fourth read voltage.
By measuring at two times, calculation errors due to the ambient light offset voltage Vax and the initial reset offset voltage Vox can be avoided.
In another embodiment of the invention, four measurements may also be used to determine the phase difference. Accordingly, the four measurements are divided into a first period, a second period, a third period and a fourth period.
Specifically, in the first period, the detection circuit 120 detects a first read voltage corresponding to the received ultrasonic signal according to a first control signal whose phase is the same as that of the first timing and detects a second read voltage corresponding to the received ultrasonic signal according to a second control signal whose phase lags behind that of the first timing by one-half cycle.
In the second period, the detection circuit 120 detects a third read voltage corresponding to the received ultrasonic signal based on the first control signal whose phase lags the phase of the first timing by a quarter cycle and detects a fourth read voltage corresponding to the received ultrasonic signal based on the second control signal whose phase lags the phase of the first timing by three quarters cycles.
In the third period, the detection circuit 120 detects a fifth read voltage corresponding to the received ultrasonic signal based on the first control signal whose phase lags by one-half cycle behind the phase of the first timing and detects a sixth read voltage corresponding to the received ultrasonic signal based on the second control signal whose phase is the same as the phase of the first timing.
In the fourth period, the detection circuit 120 detects a seventh read voltage corresponding to the received ultrasonic signal based on the first control signal whose phase lags the phase of the first timing by three-quarters of a cycle and detects an eighth read voltage corresponding to the received ultrasonic signal based on the second control signal whose phase lags the phase of the first timing by one-quarter of a cycle.
Then, the detection circuit 120 calculates a phase difference between the transmitted ultrasonic wave signal and the received ultrasonic wave signal from the first read voltage, the second read voltage, the third read voltage, the fourth read voltage, the fifth read voltage, the sixth read voltage, the seventh read voltage, and the eighth read voltage.
By measuring four times, calculation errors due to different ambient sound offset voltages, initial reset offset voltages, and capacitance parameters can be avoided.
It should be understood that the "first period," "second period," "third period," and "fourth period" described herein do not limit the order thereof, and may be performed in any order.
Further, in the embodiment of the present invention, after a phase difference between the transmitted ultrasonic wave signal and the ultrasonic wave signal received after being reflected by the target object is obtained, the distance between the target object and the panel may be calculated based on the phase difference.
In another aspect, embodiments of the present invention also provide a display device including the above panel. The display device may be, for example, a display screen, a mobile phone, a tablet computer, a camera, a wearable device, or the like.
According to the embodiment of the invention, the process for integrating the ultrasonic sensor on the glass substrate is simple to realize. In addition, the detection circuit designed for the ultrasonic signals is simple in structure and easy to realize. The cost and the added value of the whole system can be greatly reduced through the screen integration of the sensor.
Several embodiments of the present invention have been described in detail above, but the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, substitutions, or alterations can be made in the embodiments of the present invention without departing from the spirit and scope of the invention. The scope of protection of the invention is defined by the appended claims.
Claims (14)
1. A detection panel, comprising:
a substrate; and
an ultrasonic wave transmitting sensor, an ultrasonic wave receiving sensor and a detection circuit on the substrate;
wherein the ultrasonic wave emitting sensor is configured to emit an ultrasonic wave signal;
the ultrasonic receiving sensor is configured to receive an ultrasonic signal;
wherein the detection circuit is electrically coupled with the ultrasonic wave emitting sensor and the ultrasonic wave receiving sensor and configured to detect a phase difference between the emitted ultrasonic wave signal and the received ultrasonic wave signal;
wherein the detection circuit comprises: the circuit comprises a first reset circuit, a first control circuit, a first capacitor, a first reading circuit, a second reset circuit, a second control circuit, a second capacitor, a second reading circuit and a processing circuit;
wherein the first reset circuit is configured to reset a voltage of the first node according to a first reset signal;
the first control circuit is configured to transmit the electric signal generated by the ultrasonic wave receiving sensor to the first node according to a first control signal;
the first capacitor is configured to store a voltage of the first node;
the first reading circuit is configured to read a voltage of the first node according to a first switching signal;
the second reset circuit is configured to reset a voltage of the second node according to a second reset signal;
the second control circuit is configured to transmit the electric signal generated by the ultrasonic wave receiving sensor to the second node according to a second control signal;
the second capacitor is configured to store a voltage of the second node;
the second reading circuit is configured to read a voltage of the second node according to a second switching signal; and
the processing circuit is configured to generate the first control signal, the second control signal, and a third control signal for controlling the ultrasonic wave transmission sensor, and calculate a phase difference between the transmitted ultrasonic wave signal and the received ultrasonic wave signal from the read voltage of the first node and the voltage of the second node.
2. The detection panel of claim 1, wherein the first reset circuit comprises a first transistor and the second reset circuit comprises a second transistor, wherein,
a control electrode of the first transistor is coupled to the first reset signal, a first electrode of the first transistor is coupled to a first voltage end, and a second electrode of the first transistor is coupled to the first node;
a control electrode of the second transistor is coupled to the second reset signal, a first electrode is coupled to the first voltage terminal, and a second electrode is coupled to the second node.
3. The detection panel of claim 1, wherein the first control circuit comprises a third transistor and the second control circuit comprises a fourth transistor, wherein,
a control electrode of the third transistor is coupled to the first control signal, a first electrode of the third transistor is coupled to the ultrasonic receiving sensor, and a second electrode of the third transistor is coupled to the first node;
a control electrode of the fourth transistor is coupled to the second control signal, a first electrode of the fourth transistor is coupled to the ultrasonic receiving sensor, and a second electrode of the fourth transistor is coupled to the second node.
4. The detection panel of claim 1, wherein the first read circuit comprises a fifth transistor, a sixth transistor, and a first current source, and the second read circuit comprises a seventh transistor, an eighth transistor, and a second current source, wherein,
a control electrode of the fifth transistor is coupled to the first node, a first electrode of the fifth transistor is coupled to the second voltage terminal, and a second electrode of the fifth transistor is coupled to the sixth transistor;
a control electrode of the sixth transistor is coupled to the first switching signal, a first electrode of the sixth transistor is coupled to the fifth transistor, and a second electrode of the sixth transistor is coupled to the first output end;
the first current source is coupled between the first output terminal and a third voltage terminal;
a control electrode of the seventh transistor is coupled to the second node, a first electrode of the seventh transistor is coupled to the second voltage terminal, and a second electrode of the seventh transistor is coupled to the eighth transistor;
a control electrode of the eighth transistor is coupled to the second switching signal, a first electrode of the eighth transistor is coupled to the seventh transistor, and a second electrode of the eighth transistor is coupled to the second output terminal;
the second current source is coupled between the second output terminal and a third voltage terminal.
5. The detection panel of any one of claims 1 to 4, further comprising:
a focusing layer disposed above the ultrasonic receiving sensor, the focusing layer configured to focus an ultrasonic signal to be provided to the ultrasonic receiving sensor.
6. The detection panel according to any one of claims 1 to 4, wherein said ultrasonic emission sensor comprises:
the piezoelectric actuator includes a first drive electrode layer, a second drive electrode layer, and a first piezoelectric layer disposed between the first drive electrode layer and the second drive electrode layer.
7. The detection panel according to any one of claims 1 to 4, wherein the ultrasonic wave receiving sensor includes:
the piezoelectric sensor comprises a first sensing electrode layer, a second sensing electrode layer and a second piezoelectric layer arranged between the first sensing electrode layer and the second sensing electrode layer.
8. The detection panel according to any one of claims 1 to 4,
the ultrasonic transmitting sensor and the ultrasonic receiving sensor are arranged on the same layer.
9. The detection panel of claim 8, wherein the detection panel comprises a plurality of pixel cells, a plurality of ultrasonic wave emitting sensors, and a plurality of ultrasonic wave receiving sensors,
wherein the plurality of ultrasonic wave transmitting sensors are disposed around the plurality of ultrasonic wave receiving sensors;
wherein orthographic projections of the plurality of ultrasonic wave transmitting sensors and the plurality of ultrasonic wave receiving sensors on the substrate do not overlap with orthographic projections of the plurality of pixel units on the substrate.
10. A method of determining the position of a target object using the detection panel of any one of claims 1 to 9, comprising:
transmitting an ultrasonic signal;
receiving an ultrasonic signal reflected by the target object; and
detecting a phase difference between the transmitted ultrasonic signal and the received ultrasonic signal for determining a position of the target object based on the first control signal and the second control signal,
wherein the first control signal and the second control signal differ by one-half cycle.
11. The method of claim 10, wherein the ultrasonic signals are transmitted in a first timing sequence,
wherein the detecting comprises:
detecting a first read voltage corresponding to the received ultrasonic signal according to the first control signal,
detecting a second read voltage corresponding to the received ultrasonic signal according to the second control signal,
calculating a phase difference between the transmitted ultrasonic signal and the received ultrasonic signal based on the first read voltage and the second read voltage,
wherein a phase of the first control signal is the same as a phase of the first timing, and a phase of the second control signal is different from the phase of the first timing by one-half cycle.
12. The method of claim 10, wherein,
transmitting an ultrasonic signal for a first period, detecting a first read voltage corresponding to the received ultrasonic signal according to the first control signal, and detecting a second read voltage corresponding to the received ultrasonic signal according to the second control signal;
detecting a third read voltage according to the first control signal and a fourth read voltage according to the second control signal without transmitting an ultrasonic signal for a second period; and
calculating a phase difference between the transmitted ultrasonic signal and the received ultrasonic signal according to the first read voltage, the second read voltage, the third read voltage, and the fourth read voltage.
13. The method of claim 10, wherein the ultrasonic signals are transmitted in a first timing sequence,
wherein the detecting comprises:
detecting a first read voltage corresponding to the received ultrasonic signal according to the first control signal having the same phase as that of the first timing and a second read voltage corresponding to the received ultrasonic signal according to the second control signal having a phase lagging by one-half cycle than that of the first timing in a first period;
detecting a third read voltage corresponding to the received ultrasonic signal according to the first control signal having a phase lagging by a quarter cycle from that of the first timing and a fourth read voltage corresponding to the received ultrasonic signal according to the second control signal having a phase lagging by a three-quarter cycle from that of the first timing in a second period;
detecting a fifth read voltage corresponding to the received ultrasonic signal according to the first control signal having a phase lagging by one-half cycle than that of the first timing and detecting a sixth read voltage corresponding to the received ultrasonic signal according to the second control signal having the same phase as that of the first timing in a third period;
detecting a seventh read voltage corresponding to the received ultrasonic signal according to the first control signal having a phase lagging by three-quarters of a cycle than that of the first timing and detecting an eighth read voltage corresponding to the received ultrasonic signal according to the second control signal having a phase lagging by one-quarter of a cycle than that of the first timing in a fourth period; and
calculating a phase difference between the transmitted ultrasonic signal and the received ultrasonic signal according to the first read voltage, the second read voltage, the third read voltage, the fourth read voltage, the fifth read voltage, the sixth read voltage, the seventh read voltage, and the eighth read voltage.
14. A display device comprising the detection panel according to any one of claims 1 to 9.
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| CN109829419B (en) * | 2019-01-28 | 2021-08-24 | 京东方科技集团股份有限公司 | Fingerprint identification module, driving method and manufacturing method thereof and display device |
| CN111695388A (en) * | 2019-03-15 | 2020-09-22 | 京东方科技集团股份有限公司 | Fingerprint identification structure, driving method thereof and display device |
| US11295105B2 (en) * | 2019-05-28 | 2022-04-05 | Boe Technology Group Co., Ltd. | Ultrasonic sensing circuitry and releaded driving method, detection substrate and touch panel |
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