KR102210377B1 - Touch recognition apparatus and control methods thereof - Google Patents

Abstract

An ultrasound-based touch recognition device is disclosed. The touch recognition apparatus of the present invention controls a plurality of ultrasonic sensors to emit ultrasonic signals at different time intervals, each of a plurality of ultrasonic sensors emitting ultrasonic signals for each preset detection period, and the emitted ultrasonic waves. And a processor that detects a touch point of an object based on a time of flight (ToF) of an ultrasonic signal received by the signal being reflected by the object.

Description

Touch recognition device and its control method {TOUCH RECOGNITION APPARATUS AND CONTROL METHODS THEREOF}

The present invention relates to a touch recognition apparatus and a control method thereof, and more particularly, to an ultrasonic touch recognition apparatus and a control method thereof.

A touch sensing device such as a touch screen and a touch pad is an input device that can be attached to a display device to provide an intuitive input method to a user, and is widely applied to various electronic devices such as mobile phones, PDA (Personal Digital Assistant), and navigation. Has become. In particular, as the demand for smart phones is increasing in recent years, the rate of adoption of touch screens as touch sensing devices capable of providing various input methods in a limited form factor is increasing day by day.

In addition, with the popularization of VR (Visual Reality) devices to which a 3D spatial touch technology that shows the effect of manipulating an object in the air by touching a holographic image, touch technology is rapidly developing.

On the other hand, touch screens applied to portable devices are largely a resistive method, a capacitive method, an infrared (IR) method, and a surface acoustic wave (SAW) method according to a method of sensing a touch input. It can be implemented as such.

On the other hand, the SAW type touch screen is a method that detects that the size of the wave is reduced due to the encounter of an obstacle, unlike the resistive type and the capacitive type. It has been applied and is widely used.

However, the conventional SAW type touch screen has a problem in that a plurality of sound wave reflectors must be provided, and overall costs are high. Accordingly, there is a need for a method for improving touch recognition performance at a more convenient and low cost.

The present invention has been conceived to solve the above-described problem, and an object of the present invention is to provide a touch recognition device capable of more accurately measuring a touch point and a control method thereof using ToF of ultrasonic waves.

In the touch recognition apparatus according to an embodiment of the present invention for achieving the above object, a plurality of ultrasonic sensors emitting ultrasonic signals for each preset detection period, and each of the plurality of ultrasonic sensors emitting ultrasonic signals at different time intervals And a processor configured to control the plurality of ultrasonic sensors so as to detect the touch point of the object based on the time of flight (ToF) of the ultrasonic signal received by reflecting the radiated ultrasonic signal by the object.

In addition, in the processor, the plurality of ultrasonic sensors simultaneously emit a first ultrasonic signal in a first detection section, and each of the plurality of ultrasonic sensors emit a second ultrasonic signal at different time points in a second detection section. Can be controlled to do.

In addition, the processor may control the plurality of ultrasonic sensors to sequentially emit the second ultrasonic signal at a preset delay interval in the second detection period.

In addition, the processor may calculate the ToF by determining each ultrasonic sensor that emits the received ultrasonic signal based on different reception time intervals of the plurality of ultrasonic signals generated according to the different time intervals. have.

In addition, the plurality of ultrasonic sensors in the first detection section further comprises a storage unit for storing information on a time point when each ultrasonic signal is emitted and the time point when each ultrasonic signal is received by the object reflected, the processor Is, in a second detection period, information on a time point at which the plurality of ultrasonic sensors emit each ultrasonic signal, information on a time point at which each ultrasonic signal is received by reflection by the object, and the received ultrasonic wave using the stored information Each of the ultrasonic sensors that emitted the signal can be determined.

In addition, the delay may be determined to be greater than a difference in reception time of the ultrasound signal according to a maximum movement distance that the touch recognition apparatus of the object can recognize in the preset detection period.

In addition, the plurality of ultrasonic sensors may have different frequencies of radiated ultrasonic signals.

In addition, the processor may differently control phases of ultrasonic signals radiated from the plurality of ultrasonic sensors.

In addition, the processor may differently control pulse durations of ultrasonic signals radiated from the plurality of ultrasonic sensors.

In addition, in a third detection period, the processor may control to emit a plurality of ultrasound signals at a time point corresponding to a time point at which the plurality of ultrasound signals are respectively radiated in the first detection period.

In addition, a display unit may be further included, and the object may be an object that is touched on the display unit.

On the other hand, in the control method of the touch recognition apparatus according to an embodiment of the present invention, the plurality of ultrasonic sensors are configured such that each of the plurality of ultrasonic sensors emitting ultrasonic signals for each preset detection period emit ultrasonic signals at different time intervals. Controlling and detecting a touch point of the object based on a time of flight (ToF) of the ultrasonic signal received by reflecting the radiated ultrasonic signal by the object.

Here, the controlling of the plurality of ultrasonic sensors may include controlling the plurality of ultrasonic sensors to emit a first ultrasonic signal at the same time in a first detection section, and each of the plurality of ultrasonic sensors in a second detection section. It may include controlling to emit each of the second ultrasonic signals at different times.

In addition, the controlling to emit each of the second ultrasonic signals may include controlling the plurality of ultrasonic sensors to sequentially emit the second ultrasonic signals at a preset delay interval in the second detection period.

In addition, the detecting of the touch point of the object may include determining an ultrasonic sensor that emits the received ultrasonic signal based on different reception time intervals of the plurality of ultrasonic signals generated according to the different time intervals. Thus, the ToF can be calculated.

In addition, the method further comprises storing information on a time point at which the plurality of ultrasonic sensors emit each ultrasonic signal in the first detection section and a time point at which each ultrasonic signal is received by the object, the object The detecting of the touch point of may include information on a time when the plurality of ultrasonic sensors emit each ultrasonic signal in a second detection period, information on a time when each ultrasonic signal is received by reflection by the object, and the stored information Each of the ultrasonic sensors that radiated the received ultrasonic signal may be determined by using.

In addition, the delay may be determined to be greater than a difference in reception time of the ultrasound signal according to a maximum movement distance that the touch recognition apparatus of the object can recognize in the preset detection period.

In addition, the plurality of ultrasonic sensors may have different frequencies of radiated ultrasonic signals.

In addition, in the controlling of the plurality of ultrasonic sensors, phases of ultrasonic signals radiated from the plurality of ultrasonic sensors may be differently controlled.

In addition, in controlling the plurality of ultrasonic sensors, pulse durations of the ultrasonic signals radiated from the plurality of ultrasonic sensors may be controlled differently.

In addition, the controlling of the plurality of ultrasonic sensors may include controlling a plurality of ultrasonic signals to be emitted at a time corresponding to a time point at which the plurality of ultrasonic signals are respectively radiated in the first detection section in a third detection section. can do.

According to various embodiments of the present disclosure described above, since the touch recognition performance of the touch screen can be improved at low cost, user convenience is improved.

1 is a block diagram schematically showing a configuration of a touch recognition device according to an embodiment of the present invention;
2 is a block diagram schematically illustrating a configuration of a touch recognition device according to another embodiment of the present invention;
3 is a view for explaining a method of determining a touch point of an object according to an embodiment of the present invention;
4 is a view for explaining a problem due to refraction of an ultrasonic signal according to an embodiment of the present invention;
5 is a view showing a waveform of an ultrasonic signal received by each ultrasonic sensor according to the refraction of the ultrasonic signal according to an embodiment of the present invention;
6 and 7 are diagrams for explaining a method for distinguishing an ultrasonic signal emitted from each ultrasonic sensor according to an embodiment of the present invention;
8 is a diagram for explaining a condition for determining a time shift value of each ultrasound signal according to an embodiment of the present invention;
9 is a view for explaining a method for continuously distinguishing an ultrasonic signal radiated from each ultrasonic sensor according to an embodiment of the present invention;
10 is a view for explaining a method for discriminating an ultrasonic signal radiated from each ultrasonic sensor complex using a difference in signal pattern according to an embodiment of the present invention;
11 is a block diagram showing in detail a configuration of a touch recognition device according to another embodiment of the present invention;
12 is a flowchart illustrating a method of controlling a touch recognition device according to an embodiment of the present invention.

Before describing the present invention in detail, a method of describing the present specification and drawings will be described.

First, general terms used in the specification and claims are selected in consideration of functions in various embodiments of the present invention. However, these terms may vary depending on the intention of a technician in the field, legal or technical interpretation, and the emergence of new technologies. In addition, some terms may be terms arbitrarily selected by the applicant. These terms may be interpreted as the meanings defined in the present specification, and if there is no specific term definition, they may be interpreted based on the general contents of the present specification and common technical knowledge in the art.

In addition, the same reference numbers or numerals in each drawing attached to the present specification indicate parts or components that perform substantially the same function. For convenience of description and understanding, different embodiments will be described using the same reference numbers or symbols. That is, even if all the components having the same reference numerals are shown in a plurality of drawings, the plurality of drawings do not mean one embodiment.

In addition, terms including ordinal numbers such as “first” and “second” may be used in the specification and claims to distinguish between components. These ordinal numbers are used to distinguish the same or similar constituent elements from each other, and the meaning of the term should not be limitedly interpreted due to the use of such ordinal numbers. For example, components combined with these ordinal numbers should not be interpreted as limiting the order of use or arrangement by the number. If necessary, each of the ordinal numbers may be used interchangeably.

In the present specification, expressions in the singular include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "comprise" are intended to designate the existence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other It is to be understood that it does not preclude the presence or addition of features, numbers, steps, actions, components, parts, or combinations thereof.

In an embodiment of the present invention, terms such as “module”, “unit”, “part” are terms used to refer to components that perform at least one function or operation, and these components are hardware or software. It may be implemented or may be implemented as a combination of hardware and software. In addition, a plurality of “modules”, “units”, and “parts” are integrated into at least one module or chip, and at least one processor, except when each needs to be implemented as individual specific hardware. It can be implemented as (not shown).

In addition, in an embodiment of the present invention, when a part is connected to another part, this includes not only a direct connection but also an indirect connection through another medium. In addition, the meaning that a certain part includes a certain component means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically illustrating a configuration of a touch recognition apparatus according to an embodiment of the present invention.

In the present invention, the touch recognition device 100 refers to an electronic device capable of receiving a user command through a touch through a display or a touch in a three-dimensional space, for example, a smart phone, a camera, a tablet PC, a laptop, a desktop, A media player (such as an MP3 player), a PDA (Personal Digital Assistant) game terminal, a VR (Visual Reality) device, and a wearable device may be included. In addition, the touch recognition device according to the present invention can be applied to a home appliance (refrigerator, washing machine, etc.) equipped with a display.

Referring to FIG. 1, a touch recognition device 100 according to an embodiment of the present invention includes a plurality of ultrasonic sensors 110 and a processor 120.

The plurality of ultrasonic sensors 110 include first to n ultrasonic sensors 110-1 to 110-n. The first to nth ultrasonic sensors 110-1 to 110-n are configured to emit or receive ultrasonic signals. The first to nth ultrasonic sensors 110-1 to 110-n may emit ultrasonic signals, receive ultrasonic waves reflected or refracted by the object, and detect a distance from each ultrasonic sensor to the object and the direction of the object. . Here, the object may include a user's finger or a pen.

The processor 120 is a component that controls the overall operation of the touch recognition device 100.

When the ultrasonic signals radiated from the plurality of ultrasonic sensors 110 are reflected by the object and received by the plurality of ultrasonic sensors 110, the processor 120 determines the Time of Flight (ToF) of each received ultrasonic signal. Based on this, the touch point of the object can be determined.

For example, the processor 120 may reflect the ultrasonic signals emitted from the first ultrasonic sensor 110-1 and the second ultrasonic sensor 110-2 by the object, and the first ultrasonic sensor 110-1 and When received by each of the second ultrasonic sensors 110-2, from the first ultrasonic sensor 110-1 and the second ultrasonic sensor 110-2 to the touch point of the object based on the ToF of each received ultrasonic signal Each distance of is calculated, and the touch point of the object may be determined based on the calculated distance.

Specifically, the processor 120 reflects the ultrasonic waves radiated from the transmitter (not shown) of the first ultrasonic sensor 110-1 by the object to the receiver (not shown) of the first ultrasonic sensor 110-1. The time it takes to return (ToF) can be detected. At this time, since the speed of the ultrasonic wave is always constant at 340 m/s, the processor 120 may calculate a distance from the first ultrasonic sensor 110-1 to the object based on the detected ToF.

In addition, the processor 120 reflects the ultrasonic waves emitted from the transmitter (not shown) of the second ultrasonic sensor 110-2 by the object and returns to the receiver (not shown) of the second ultrasonic sensor 110-2. The time it takes to come (ToF) can be detected. Likewise, the processor 120 may calculate a distance from the second ultrasonic sensor 110-2 to the object based on the detected ToF.

When the distance to the object from each of the first and second ultrasonic sensors 110-1 and 110-2 is calculated, the position of the object may be calculated by a triangulation method. That is, assuming that the distance between the first ultrasonic sensor 110-1 and the second ultrasonic sensor 110-2 in the touch recognition device 100 is known information, the object from the first ultrasonic sensor 110-1 When the distance to and the distance from the second ultrasonic sensor 110-2 to the object are calculated, three elements of a triangle (length of three sides) are determined, and the processor 120 determines the object on the two-dimensional coordinates by the triangulation method. Can determine the location of. In addition, according to this method, it will be apparent that the position of the object on the three-dimensional coordinates of the object can also be determined in consideration of distances from three or more ultrasonic sensors provided at different positions to the object.

Meanwhile, as shown in FIG. 2, the touch recognition apparatus 100 ′ according to an exemplary embodiment may further include a display unit 130.

The display unit 130 is a component in which a user touches. Specifically, the user may input desired information by touching various contents displayed on the display unit 130 using a finger or an electronic pen. That is, the display unit 130 may be implemented as a touch screen serving as a touch pad while displaying content.

Meanwhile, the display unit 130 may be implemented as various types of displays such as a Liquid Crystal Display Panel (LCD), Organic Light Emitting Diodes (OLED), Liquid Crystal on Silicon (LCoS), and Digital Light Processing (DLP). In addition, a driving circuit, a backlight unit, and the like, which may be implemented in the form of an a-si TFT, a low temperature poly silicon (LTPS) TFT, an organic TFT (OTFT), and the like may be included in the display unit 130.

Here, a glass substrate, a protective film, and the like that have been tempered to protect the display unit 130 may be provided on the front surface of the display unit 130 in which the touch is performed.

The plurality of ultrasonic sensors 110 includes first to n ultrasonic sensors 110-1 to 110-n, and the first to n ultrasonic sensors 110-1 to 110-n radiate or receive ultrasonic signals. Configuration. The first to nth ultrasonic sensors 110-1 to 110-n are respectively provided on the outer periphery of the display unit 130 to emit ultrasonic signals, receive ultrasonic waves reflected or refracted by the object, and receive an object from each ultrasonic sensor. The distance to and the direction of the object can be detected.

3 is a diagram illustrating a method of determining a touch point of an object according to an embodiment of the present invention.

Hereinafter, an exemplary embodiment in which the first to fourth ultrasonic sensors 110-1 to 110-4 are provided in the vicinity of each corner of the display 130 will be described. However, the implementation of the present invention is not limited to these embodiments, and the touch recognition apparatus 100 of the present invention includes two or three ultrasonic sensors at various locations outside the display 130, or five or more It is obvious that what is implemented with an ultrasonic sensor can also be included in the technical idea of the present invention.

As shown in FIG. 3, it may be assumed that the object o ₁ is touched on the display 130. At this time, the processor 120 reflects the ultrasonic waves emitted from the transmitter (T _x ^B ) of the second ultrasonic sensor 110-2 by the object (o ₁ ), and the receiver of the second ultrasonic sensor 110-2 ( The time taken to return to R _x ^B ) (ToF ₁ ) can be detected. At this time, since the speed of the ultrasonic wave is constant, the processor 120 may calculate a distance b ₁ from the second ultrasonic sensor 110-2 to the object o ₁ based on the detected ToF ₁ .

In addition, the processor 120 reflects the ultrasonic waves emitted from the transmitter (T _x ^C ) of the third ultrasonic sensor 110-3 by the object (o ₁ ), and the receiver of the third ultrasonic sensor 110-3 ( The time taken to return to R _x ^C ) (ToF ₂ ) can be detected. The processor 120 may also calculate a distance c ₁ from the third ultrasonic sensor 110-3 to the object o ₁ based on the detected ToF ₂ .

When the distances b ₁ and c ₁ are calculated, the position of the object o ₁ on the display 130 may be calculated by triangulation. That is, assuming that the distance l ₁ between the second ultrasonic sensor 110-2 and the third ultrasonic sensor 110-3 in the touch recognition device 100 is known information, the second ultrasonic sensor 110-2 ) To the object (o ₁ ) distance b ₁ and the third ultrasonic sensor 110-3 to the object (o ₁ ) distance c ₁ is calculated, the three elements (length of the three sides) of the triangle are determined, The processor 120 may determine the position of the object o ₁ on the two-dimensional coordinates of the display 130 by using a triangulation method as illustrated in FIG. 3.

As a result, the processor 120 is an object (o _1), the second ultrasonic sensor 110-2 and the third on the basis of the distance from the ultrasonic sensor (110-3) to determine the touch point of the object (o ₁₎ I can.

In this way, in order to determine the touch point of the object o ₁ , distances from at least two ultrasonic sensors must be calculated. At this time, the ultrasonic sensor used for distance calculation may be selected in various ways, but the ultrasonic sensor that detects the fastest ToF, that is, the ultrasonic sensor that is the shortest distance from the object o ₁ and the ultrasonic sensor that is closest thereto It is preferably selected to be included.

Meanwhile, FIG. 4 is a diagram for explaining a problem caused by refraction of an ultrasonic signal according to an embodiment of the present invention. In FIG. 4, the transmitters (T _x ^A to T _x ^D ) and the receivers (R _x ^A to R _x ^D ) of each of the ultrasonic sensors 110-1 to 110-4 are not separately shown, but briefly integrated.

As shown in FIG. 4, the ultrasonic signals emitted from the transmitters (T _x ^A to T _x ^D ) of the plurality of ultrasonic sensors (110-1 to 110-4) are reflected by the object (o ₁ ) to each ultrasonic wave. It is received by the receiver (R _x ^A ~ R _x ^D ) of the sensors (110-1 ~ 110-4). For example, as shown in FIG. 4, the linear distances from the _first to fourth ultrasonic sensors 110-1 to 110-4 to the touched object o ₁ are 459 mm, 760 mm, 814 mm and 576 mm, respectively. In this case, the processor 120 may calculate the ToF of each ultrasonic signal reflected by the object o ₁ after being radiated and returned, and accordingly, on the display, each ultrasonic sensor 110-1 to 110- The distance from 4) to the object o ₁ can be calculated.

However, at this time, since each of the ultrasonic sensors 110-1 to 110-4 also receives an ultrasonic signal that is radiated from another ultrasonic sensor and refracted by the object o ₁ , the processor 120 receives each received signal. It is difficult to distinguish whether it is a recognition or a refractive signal from another ultrasonic sensor.

For example, as shown in FIG. 4, when an ultrasonic signal is radiated from the transmitter (T _x ^D ) of the fourth ultrasonic sensor 110-4, it is reflected by the object o ₁ and is reflected by the fourth ultrasonic sensor ( In addition to the signal received by the receiving unit (R _x ^D ) of 110-4), it is refracted by the object (o ₁ ) and the receiving unit (R) of the first, second, and third ultrasonic sensors 110-1 to 110-3 ^A signal received by _x ^A ~ R _x ^C ) occurs. That is, since each of the ultrasonic sensors 110-1 to 110-4 receives an ultrasonic signal that is radiated and refracted from another ultrasonic sensor, it additionally receives three refraction signals in addition to the reflected signal.

5 is a diagram illustrating a waveform of an ultrasonic signal received by each ultrasonic sensor according to the refraction of the ultrasonic signal according to an embodiment of the present invention.

As shown in Fig. 5, the ultrasonic signals 51 to 54 from the transmitters (T _x ^A to T _x ^D ) of each ultrasonic sensor (110-1 to 110-4) are each section at a constant period (5.83 ms). Can be radiated at the same time. Here, the period in which the ultrasonic signals 51 to 54 are emitted may be determined based on the size of the display. The radiation period of the ultrasonic signals 51 to 54 is preferably equal to or longer than a time reflected by an object located at a point farthest from an ultrasonic sensor among a display area that can be touched by an object. Here, each section in which the ultrasonic sensor periodically emits an ultrasonic signal may be referred to as a preset detection section.

On the other hand, the receiving unit (R _x ^A ~ R _x ^D ) of each ultrasonic sensor (110-1 to 110-4) receives a refraction signal from another ultrasonic sensor in addition to the reflected signal reflected by the object after being radiated from itself can do. As shown in FIG. 5, when the object o ₁ is closest to the first ultrasonic sensor 110-1 among the plurality of ultrasonic sensors 110-1 to 110-4, the first ultrasonic sensor 110- The receiving unit (R _x ^A ) of ₁ ) first receives the signal reflected by the object (o ₁ ), and then receives the signal refracted by other ultrasonic sensors (110-2 to 110-4) as the object (o ₁ ) The ultrasonic sensors close to are received in order.

Therefore, in order to calculate the ToF, the processor 120 needs to distinguish the reflected signal from the remaining three refracted signals among the four received signals, but the difference between the reflected signal and the refracted signal is such that the waveforms can be distinguished. There is a problem that it is not easy to distinguish because it is not there. Therefore, if such a reflection signal and a refractive signal cannot be distinguished, there is a high probability that a touch recognition error occurs.

In order to solve this problem, conventionally, a method in which each of the ultrasonic sensors 110-1 to 110-4 sequentially emit ultrasonic waves one by one for each detection period is used in a time division method. However, this method has not been an effective method because the time required for touch recognition increases as much as there are many ultrasonic sensors. For example, when one detection period is 5.8 ms and there are 4 ultrasonic sensors, it takes 5.8 x 4 ms time, so there is a problem that touch recognition performance is deteriorated. Accordingly, the present invention is to allow the reflected signal and the refracted signal to be distinguished more quickly without using a time division method. 6 and 7 illustrate the idea of this invention.

6 and 7 are diagrams for explaining a method for discriminating an ultrasonic signal emitted from each ultrasonic sensor according to an embodiment of the present invention.

6 schematically shows an idea for distinguishing a reflected signal from a refracted signal. Each of the ultrasonic sensors 110-1 to 110-4 may emit an ultrasonic signal in each detection section that emits an ultrasonic signal. 6 shows a waveform of an ultrasonic signal emitted from a first ultrasonic sensor 110-1 and a second ultrasonic sensor 110-2 among a plurality of ultrasonic sensors 110-1 to 110-4 and the emitted ultrasonic signal. It shows only the waveforms of reflection and refraction signals received from each of the ultrasonic sensors 110-1 and 110-2.

The processor 120 controls the plurality of ultrasonic sensors 110-1 to 110-4 so that each of the plurality of ultrasonic sensors 110-1 to 110-4 emit ultrasonic signals at different time intervals, and the signal on the basis of the ultrasonic ToF signal received is reflected by the object (o ₁₎ it is possible to detect the touch point of the object (o _1).

Specifically, as shown in FIG. 6, ultrasonic signals are simultaneously emitted from the transmitters (T _x ^A and T _x ^B ) of the first and second ultrasonic sensors 110-1 and 110-2 in the first detection section. . The receiving units R _x ^A and R _x ^{B of} each of the ultrasonic sensors 110-1 and 110-2 receive a signal reflected or refracted by the object o ₁ . The first ultrasonic sensor 110-1 sequentially receives a reflection signal and a refraction signal from the second ultrasonic sensor 110-2, and the second ultrasonic sensor 110-2 is a first ultrasonic sensor 110-1 The refraction signal from) is first received, and then, the reflected signal is received. In the first detection section, it is not possible to know which of the signals received from each of the ultrasonic sensors 110-1 and 110-2 is a reflection signal or a refraction signal, but the reflection signal and the refraction signal are received in the first detection section. A reflection signal and a refraction signal may be determined in the second detection section by using information on the viewpoint.

Specifically, the processor 120, for each of the first and second ultrasonic sensors 110-1 and 110-2, the time (0ms, 0ms) the ultrasonic signal is emitted from the start of the first detection period, the reflected signal, and Information on the time taken until the refraction signal is received (2.5 ms and 3.1 ms of the first ultrasonic sensor, 3.08 ms and 3.8 ms of the second ultrasonic sensor) is stored, respectively. In this case, the touch recognition apparatus 100 according to an embodiment of the present invention further includes a storage unit 140 for storing information on a time point at which each ultrasonic sensor receives a reflection signal and a refraction signal in the first detection period. can do.

Thereafter, the processor 120 may control each of the first and second ultrasonic sensors 110-1 and 110-2 to emit ultrasonic signals at different time points in the second detection period. Specifically, the processor 120 includes the first and second ultrasonic sensors 110-so that the first and second ultrasonic sensors 110-1 and 110-2 emit ultrasonic signals at different times in the second detection period. With respect to at least one of the sensors 1 and 110-2), a timing at which the ultrasonic signal is emitted may be delayed.

That is, the processor 120 determines that the ultrasonic wave is emitted from the first ultrasonic sensor 110-1 from the start of the second detection interval and the ultrasonic wave is emitted from the first ultrasonic sensor 110-1 from the start of the first detection interval. It can be controlled to correspond to the point at which is emitted. At this time, the time when the reflected signal is received by the first ultrasonic sensor 110-1 from the start of the second detection interval and the reflected signal by the first ultrasonic sensor 110-1 from the start of the first detection interval Corresponds to the time point at which is received.

On the other hand, as shown in FIG. 6, the processor 120 transmits the second ultrasonic wave from the start point of the second detection section to the second ultrasonic wave sensor 110-2 from the start point of the first detection section. It is possible to control so that a time shift occurs as much as Δms between timing points at which ultrasonic waves are emitted from the sensor 110-2. For example, in the second detection section of the second ultrasonic sensor 110-2, the processor 120 is a time shifted by Δms from a time corresponding to a time when ultrasonic waves are emitted from the first detection section (0 +△ms) can be controlled to emit ultrasonic waves.

At this time, the reflected signal of the ultrasonic signal emitted by being time-shifted by △ms from the start of the second detection period in the second ultrasonic sensor 110-2 is also time-shifted (3.8+△ms) by △ms, The refraction signal received from the second ultrasonic sensor 110-2 by the first ultrasonic sensor 110-1 does not cause a time shift (3.08 ms).

Meanwhile, in the second detection section of the first ultrasonic sensor 110-1, the refraction signal by the second ultrasonic sensor 120 is Δms higher than the time point corresponding to the time point at which the refraction signal received in the first detection section is received. It may appear as time shifted (3.1+△ms). However, a time shift (2.5 ms) does not occur in the reflected signal emitted by the first ultrasonic sensor 110-1 and received by the first ultrasonic sensor 110-1.

Through the above process, the processor 120 analyzes the signal waveform received by the first ultrasonic sensor 110-1 in the first detection period and the second detection period and reflects the signal in which no time shift has occurred. As a signal, a signal in which a time shift has occurred may be determined as a refraction signal. The processor 120 may calculate the ToF between the first ultrasonic sensor 110-1 and the object o ₁ in the second detection section by considering only the time when the reflected signal excluding the refraction signal is received, and the calculated ToF The distance between the first ultrasonic sensor 110-1 and the object o ₁ may be derived by using.

In addition, the processor 120 analyzes the signal waveform received by the second ultrasonic sensor 110-2 in the first detection period and the second detection period, and converts the time-shifted signal into a reflected signal, and the time shift is A signal that has not occurred can be determined as a refraction signal. The processor 120 may calculate the ToF between the second ultrasonic sensor 110-2 and the object o ₁ in the second detection section by considering only the time when the reflected signal excluding the refraction signal is received, and the calculated ToF The distance between the second ultrasonic sensor 110-2 and the object o ₁ may be derived by using. That is, the processor 120 includes the ultrasonic sensors 110-1 and 110-2 so that the first ultrasonic sensor 110-1 and the second ultrasonic sensor 110-2 emit ultrasonic signals at different time intervals. By controlling the ToF of each ultrasonic signal can be calculated.

Meanwhile, the time shift is the time difference (△ms) when one ultrasonic sensor emits an ultrasonic signal at a time later or earlier than the ultrasonic signal emitted from another ultrasonic sensor by a preset time (△ms) in a preset detection period. Means ). Hereinafter, when one ultrasonic sensor emits an ultrasonic signal as late as Δms based on the start time of a preset detection period, it is assumed that the ultrasonic signal of one ultrasonic sensor is delayed as much as Δms. In addition, when one ultrasonic sensor emits an ultrasonic signal △ms later than an ultrasonic signal radiated from another ultrasonic sensor as a reference, the ultrasonic signal of one ultrasonic sensor is delayed by △ms compared to the ultrasonic signal of the other ultrasonic sensor. ).

7 is a diagram illustrating a method of distinguishing a reception waveform of an ultrasonic signal by all ultrasonic sensors according to an embodiment of the present invention. As illustrated in FIG. 7, in the first detection period, each of the ultrasonic sensors 110-1 to 110-4 may simultaneously emit ultrasonic signals. ① to ④ represent ultrasonic signals radiated from the transmitters (T _x ^A to T _X ^D ) of each of the ultrasonic sensors 110-1 to 110-4 in the first and second detection intervals.

As shown in FIG. 7, the processor 120 controls to emit an ultrasonic signal at a time corresponding to a time point of ultrasonic radiation in the first detection section in the second detection section of the first ultrasonic sensor 110-1 can do. In addition, the processor 120 controls to emit ultrasonic waves at a time delayed by Δms from a time corresponding to a time point corresponding to the time point of ultrasonic radiation in the first detection section in the second detection section of the second ultrasonic sensor 110-2. I can. In addition, in the second detection section of the third ultrasonic sensor 110-3, the processor 120 controls to emit ultrasonic waves at a time delayed by 2 Δms from a time corresponding to the time of ultrasonic radiation in the first detection section. can do. In addition, the processor 120 controls to emit ultrasonic waves at a time delayed by 3 Δms from a time corresponding to a time point corresponding to a time point corresponding to the time point corresponding to the time point of ultrasonic radiation in the first detection section in the second detection section of the fourth ultrasonic sensor 110-4. can do. That is, in the second detection period, the processor 120 may control each of the ultrasonic sensors 110-1 to 110-4 to have a difference in emission time by a preset delay Δ.

Meanwhile, ⑤ to ⑧ represent ultrasonic signals radiated from the receiving units (R _x ^A to R _X ^D ) of each of the ultrasonic sensors 110-1 to 110-4 in the first and second detection intervals. As shown in FIG. 7, in the first detection period, reflection and refraction signals by ultrasonic signals simultaneously radiated from the first to fourth ultrasonic sensors 110-1 to 110-4 may be detected. In this case, the signals received by each of the ultrasonic sensors 110-1 to 110-4 may be detected in the order of ultrasonic sensors closest to the object o ₁ .

For example, when the ultrasonic sensors closest to the object o ₁ are in order, the first ultrasonic sensor, the fourth ultrasonic sensor, the second ultrasonic sensor, and the third ultrasonic sensor, as shown in FIG. 1 The reflection and refraction signals received from the ultrasonic sensor 110-1 are reflected signals from the first ultrasonic sensor 110-1, the refraction signals from the fourth ultrasonic sensor 110-4, and the second ultrasonic sensor 110 The refraction signal from -2) may be detected in the order of the refraction signal from the third ultrasonic sensor 110-3.

In addition, the reflection and refraction signals received from the second ultrasonic sensor 110-2 are a refraction signal from the first ultrasonic sensor 110-1, a refraction signal from the fourth ultrasonic sensor 110-4, and a second ultrasonic wave. The reflected signal from the sensor 110-2 may be detected in the order of the refraction signal from the third ultrasonic sensor 110-3.

In addition, the reflection and refraction signals received from the third ultrasonic sensor 110-3 are a refraction signal from the first ultrasonic sensor 110-1, a refraction signal from the fourth ultrasonic sensor 110-4, and the second ultrasonic wave. The refraction signal from the sensor 110-2 may be detected in the order of the reflection signal from the third ultrasonic sensor 110-3.

In addition, the reflection and refraction signals received from the fourth ultrasonic sensor 110-4 are a refraction signal from the first ultrasonic sensor 110-1, a reflection signal from the fourth ultrasonic sensor 110-4, and the second ultrasonic wave. The refraction signal from the sensor 110-2 and the refraction signal from the third ultrasonic sensor 110-3 may be detected in this order.

Meanwhile, as shown in FIG. 7, in the second detection period, the reflected signal of the first ultrasonic sensor 110-1 received by the first ultrasonic sensor 110-1 does not cause a delay, but the second ultrasonic sensor The refraction signal of (110-2) is delayed by Δms, the refraction signal of the third ultrasonic sensor 110-3 is delayed by 2 Δms, and the refraction signal of the fourth ultrasonic sensor is delayed by 3 Δms. Accordingly, the processor 120 may determine a signal in which no delay has occurred as a reflected signal of the first ultrasonic sensor 110-1. In addition, the processor 120 uses a signal in which the delay occurs by Δms as a refraction signal of the second ultrasonic sensor 110-2, and a signal in which 2 Δms occurs as a refraction signal of the third ultrasonic sensor 110-3, A signal generated by 3 Δms may be determined as a refraction signal of the fourth ultrasonic sensor 110-4. In this way, the processor 120 may determine whether each reflected or refracted signal is a signal received by reflecting or refracting from which ultrasonic sensor according to the degree of the delay.

Likewise, in the second detection period, the refraction signal of the first ultrasonic sensor 110-1 received by the second ultrasonic sensor 110-2 does not cause a delay, but is received by the second ultrasonic sensor 110-2. The reflected signal of the second ultrasonic sensor 110-2 is delayed by Δms. Accordingly, the processor 120 may determine a signal in which no delay has occurred as a refraction signal of the first ultrasonic sensor 110-1. In addition, the processor 120 uses a signal in which the delay occurs as much as Δms as a reflected signal from the second ultrasonic sensor 110-2, and the signal in which the delay occurs as much as 2Δms as a refraction signal from the third ultrasonic sensor 110-2. Thus, a signal in which the delay occurs by 3 Δms may be determined as a refraction signal of the fourth ultrasonic sensor 110-2.

In the second detection period, the refraction signal of the first ultrasonic sensor 110-1 received by the third ultrasonic sensor 110-3 does not cause a delay, but the third ultrasonic sensor 110-3 2 The refraction signal of the ultrasonic sensor 110-2 is delayed by Δms. Accordingly, the processor 120 may determine a signal in which no delay has occurred as a refraction signal of the first ultrasonic sensor 110-1. In addition, the processor 120 uses a signal in which the delay occurs as much as Δms as a refraction signal from the second ultrasonic sensor 110-2, and the signal in which the delay occurs as much as 2 Δms as a reflection signal from the third ultrasonic sensor 110-2. Thus, a signal in which the delay occurs by 3 Δms may be determined as a refraction signal of the fourth ultrasonic sensor 110-2.

In the second detection period, the refraction signal of the first ultrasonic sensor 110-1 received by the fourth ultrasonic sensor 110-4 does not cause a delay, but the first ultrasonic sensor 110-4 does not cause a delay. 2 The refraction signal of the ultrasonic sensor 110-2 is delayed by Δms. Accordingly, the processor 120 may determine a signal in which no delay has occurred as a refraction signal of the first ultrasonic sensor 110-1. In addition, the processor 120 uses a signal in which the delay occurs by Δms as a refraction signal of the second ultrasonic sensor 110-2, and the signal in which the delay occurs by 2 Δms is a refraction signal of the third ultrasonic sensor 110-2. As such, a signal in which the delay occurs by 3 Δms may be determined as a reflected signal of the fourth ultrasonic sensor 110-2.

Meanwhile, FIG. 8 is a diagram for explaining a condition for determining a time shift value of each ultrasound signal according to an embodiment of the present invention.

In the present invention, the time shift may be determined to be greater than a difference in reception time of an ultrasound signal according to a maximum movement distance that can be recognized by the touch recognition apparatus of an object in a preset detection period. Specifically, assuming that the distance at which the user can touch and drag for 1 second using a finger is at most 1m, the distance at which the object can move during the preset detection period (5.8ms) is also at most 5.8mm. . At this time, the maximum phase difference of the ultrasound generated in the two detection sections due to the movement of the object is a value obtained by dividing the maximum movement distance of the object by the speed of the ultrasound (5.8mm/343ms=16.9 μs). Therefore, the minimum phase difference for phase difference synchronization in the two detection intervals, that is, the minimum value of the time shift may be determined to be 33.8 μs, which is twice the 16.9 μs.

9 is a diagram for explaining a method for continuously discriminating an ultrasonic signal emitted from each ultrasonic sensor according to an embodiment of the present invention.

As shown in FIG. 9, in the first detection section and the second detection section, a radiation pattern of the ultrasonic signals of each of the ultrasonic sensors 110-1 to 110-4 may be repeated. That is, in the third detection period after the second detection period, the processor 120 may control the emission of the plurality of ultrasound signals at a time point corresponding to the time point at which the plurality of ultrasound signals of the first detection period are respectively radiated. have.

In this case, the processor 120 receives different receptions generated according to a plurality of ultrasonic signals radiated at different time intervals for each of the ultrasonic sensors 110-1 to 110-4 in the second detection section and the third detection section. Based on the time interval, the ToF may be calculated by determining each ultrasonic sensor that emits the received ultrasonic signal. Specifically, the processor 120 is at the time when the plurality of ultrasonic sensors 110-1 to 110-4 emit each ultrasonic signal in the second detection period and the time when each ultrasonic signal is received by reflection by the object. Information about the information may be stored in the storage unit 140.

Thereafter, the processor 140 determines when the plurality of ultrasonic sensors 110-1 to 110-4 emit each ultrasonic signal in the third detection period and the time when each ultrasonic signal is received by being reflected by the object. An ultrasonic sensor that emits a received ultrasonic signal may be determined by using the information and information stored in the storage 140.

10 is a diagram for describing a method for distinguishing ultrasonic signals radiated from each ultrasonic sensor complex by using a difference in signal pattern according to an embodiment of the present invention.

According to an embodiment of the present invention, the plurality of ultrasonic sensors 110-1 to 110-4 radiated from the touch recognition apparatus 100 may have different frequencies of the emitted ultrasonic signals. Specifically, by implementing ultrasonic signals radiated from each of the ultrasonic sensors 110-1 to 110-4 as signals of different frequencies, the object (o ₁ ) is radiated from other ultrasonic sensors from ultrasonic signals received from each ultrasonic sensor. It is possible to improve the separation effect of the ultrasonic signal refracted by the.

In addition, according to another embodiment of the present invention, the processor 120 may differently control phases of ultrasonic signals radiated from the plurality of ultrasonic sensors 110-1 to 110-4, respectively. Specifically, the processor 120 may partially control the phase of the ultrasonic signal emitted from each ultrasonic sensor according to the ADC temporal resolution. For example, in the processor 120, the phase of the ultrasonic signal radiated from the first ultrasonic sensor 110-1 is 0°, the phase of the ultrasonic signal radiated from the second ultrasonic sensor 110-2 is 90°, 3 The phase of the ultrasonic signal radiated from the ultrasonic sensor 110-3 is 180°, and the phase of the ultrasonic signal radiated from the fourth ultrasonic sensor 110-4 is 270°, so that ultrasonic signals having different phases are emitted. Can be controlled. Accordingly, it is possible to improve the separation effect of the ultrasonic signal that is refracted by the object o ₁ by being radiated from another ultrasonic sensor from the ultrasonic signal received from each ultrasonic sensor.

In addition, according to another embodiment of the present invention, the processor 120 differently controls the pulse duration of the ultrasonic signals radiated from each of the plurality of ultrasonic sensors 110-1 to 110-4 to control each ultrasonic wave. The refraction signal and the reflected signal from the sensors 110-1 to 110-4 can be distinguished.

As described above, the frequency division method, the phase control method, and the pulse duration adjustment method are appropriately mixed with the time shift method for the ultrasonic emission period of the present invention to increase the probability of discriminating between the reflected signal and the refracted signal.

As shown in FIG. 10, the processor 120 adjusts the timing of ultrasonic radiation in the second detection section of the second ultrasonic sensor 110-2 differently from the first ultrasonic sensor 110-1, so that each ultrasonic sensor The reflected signal and the refraction signal received at (110-1, 110-2) can be distinguished. In particular, in addition to this, the processor 120 differently controls the pulse duration of the ultrasonic waves emitted from the first ultrasonic sensor 110-1 and the ultrasonic waves emitted from the second ultrasonic sensor 110-2, so that the reflected signal and the refraction are different. The probability of discriminating signals can be increased.

11 is a block diagram showing in detail a configuration of a touch recognition device according to another embodiment of the present invention. As shown in FIG. 11, a touch recognition device 100 ″ according to another embodiment of the present invention includes first to n ultrasonic sensors 110-1 to 110-n, a processor 120, and a display 130 , A storage unit 140, and a user interface 150. Hereinafter, a description of the configuration overlapping with that of FIG. 1 will be omitted.

The processor 120 is a component that controls the overall operation of the touch recognition device 100 ″. Specifically, the processor 120 includes a ROM 121, a RAM 122, a CPU 123, first to n interfaces 124-1 to 124-n, and a bus 125. Here, the ROM 121, the RAM 122, the CPU 123, the first to n interfaces 124-1 to 124-n, and the like may be connected to each other through the bus 125.

The CPU 123 accesses the storage unit 140 and performs booting using the stored O/S. In addition, the CPU 123 may perform various operations using various programs, contents, and data stored in the storage unit 140.

The ROM 121 stores an instruction set for booting a system, and the like. When the turn-on command is input and power is supplied, the CPU 123 copies the O/S stored in the storage unit 140 to the RAM 122 according to the instruction stored in the ROM 121, and executes the O/S. Boot. When booting is complete, the CPU 123 copies various application programs stored in the storage unit 140 to the RAM 122 and executes the application programs copied to the RAM 122 to perform various operations.

The first to nth interfaces 124-1 to 124-n are connected to the above-described various components. One of the interfaces may be a network interface that is connected to an external device through a network.

Meanwhile, the above-described operation of the processor 120 may be performed by a program stored in the storage unit 140.

The storage unit 140 may store various data such as an O/S (Operating System) software module for driving the touch recognition device 100 ″ and various multimedia contents.

Specifically, the storage unit 140 generates a base module that processes signals transmitted from hardware included in the touch recognition device 100 ″, a storage module that manages a database (DB) or registry, and a layout screen. It is possible to store a graphic processing module, a security module, etc. In particular, the storage unit 140 may store programs such as a ToF calculation module required to detect ToF of an ultrasonic signal according to an embodiment of the present invention, and a touch coordinate determination module to detect a touch point by an object. .

The user interface 150 is a component for detecting user interaction for controlling the overall operation of the touch recognition device 100 ″, and includes various interaction detection devices such as a camera (not shown) and a microphone (not shown). Can include.

12 is a flowchart illustrating a method of controlling a touch recognition device according to an embodiment of the present invention.

First, the plurality of ultrasonic sensors are controlled so that each of the plurality of ultrasonic sensors emitting ultrasonic signals for each preset detection period emit ultrasonic signals at different time intervals (S1210). In this case, in the first detection section, a plurality of ultrasonic sensors can be controlled to emit a first ultrasonic signal at the same time, and in the second detection section, a plurality of ultrasonic sensors are controlled to emit a second ultrasonic signal at different times. can do. In addition, in the second detection period, the plurality of ultrasonic sensors may be controlled to sequentially emit second ultrasonic signals at preset delay intervals. Here, the delay may be determined to be greater than a difference in reception time of an ultrasound signal according to a maximum movement distance that can be recognized by the touch recognition apparatus of an object in a preset detection period.

Thereafter, the touch point of the object is detected based on the time of flight (ToF) of the received ultrasonic signal by reflecting the emitted ultrasonic signal by the object (S1220). In this case, based on different reception time intervals of the plurality of ultrasonic signals generated according to different time intervals, each ultrasonic sensor that emits the received ultrasonic signal may be determined to calculate the ToF.

In addition, in the first detection period, information on a time point at which the plurality of ultrasonic sensors emit each ultrasonic signal and a time point at which each ultrasonic signal is received by reflection by an object may be stored. At this time, in the second detection period, the plurality of ultrasonic sensors radiate the received ultrasonic signal using information on the time point at which each ultrasonic signal is emitted, the time point at which each ultrasonic signal is received by reflection by the object, and the stored information. Each of the ultrasonic sensors can be determined.

Meanwhile, the plurality of ultrasonic sensors may have different frequencies of radiated ultrasonic waves. In addition, the phases of the ultrasonic signals radiated from the plurality of ultrasonic sensors may be controlled differently, and the pulse duration of the ultrasonic signals radiated from the plurality of ultrasonic sensors may be controlled differently.

In addition, in the third detection section, a control may be performed to emit a plurality of ultrasonic signals at a time point corresponding to a time point at which the plurality of ultrasonic signals in the first detection section are respectively emitted.

As described above, according to various embodiments of the present invention, since the identification time can be shortened compared to the time-division type identification method in which ultrasonic waves are sequentially emitted and received for each ultrasonic sensor, the touch recognition performance of the touch screen can be improved. .

The control method of the touch recognition device according to the various embodiments described above may be implemented as a program and stored in various recording media. That is, a computer program that is processed by various processors and capable of executing the various control methods described above may be used in a state stored in a recording medium.

As an example, controlling the plurality of ultrasonic sensors so that each of the plurality of ultrasonic sensors emitting ultrasonic signals for each preset detection period emit ultrasonic signals at different time intervals, and the radiated ultrasonic signals are reflected by the object and received. A non-transitory computer readable medium in which a program for performing the step of detecting a touch point of an object based on the time of flight (ToF) of the ultrasonic signal may be stored.

The non-transitory readable medium refers to a medium that stores data semi-permanently and can be read by a device, not a medium that stores data for a short moment, such as a register, cache, or memory. Specifically, the above-described various applications or programs may be provided by being stored in a non-transitory readable medium such as a CD, DVD, hard disk, Blu-ray disk, USB, memory card, and ROM.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and is generally used in the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Various modifications are possible by those skilled in the art of course, and these modifications should not be individually understood from the technical idea or perspective of the present invention.

100, 100', 100'': touch recognition device 110-1 to 110-n: ultrasonic sensor
120: processor 130: storage
140: display

Claims (21)

In the touch recognition device,
A plurality of ultrasonic sensors; And
Controlling the plurality of ultrasonic sensors to periodically emit ultrasonic signals according to different radiation time intervals,
Based on a reception time interval of the ultrasonic signals periodically received by each of the plurality of ultrasonic sensors and a radiation time interval of the ultrasonic signals periodically radiated from each of the plurality of ultrasonic sensors, among ultrasonic signals received by the plurality of ultrasonic sensors To determine the received ultrasonic signals radiated by each of the plurality of ultrasonic sensors,
Includes; a processor for detecting a touch point of an object based on a Time of Flight (ToF) of the ultrasonic signal emitted and received by each of the plurality of ultrasonic sensors,
The processor,
Controlling the plurality of ultrasonic sensors so that the plurality of ultrasonic sensors simultaneously emit first ultrasonic signals, respectively, in a first detection period,
The touch recognition apparatus, wherein the plurality of ultrasonic sensors control the plurality of ultrasonic sensors so that each of the plurality of ultrasonic sensors emit second ultrasonic signals at different time points in a second detection period. delete The method of claim 1,
The processor,
A first ultrasonic sensor among the plurality of ultrasonic sensors controls the first ultrasonic sensor to emit ultrasonic signals according to a first radiation time interval,
The second ultrasonic sensor of the plurality of ultrasonic sensors controls the second ultrasonic sensor to emit ultrasonic signals according to a second radiation time interval in which the first radiation time interval is delayed by a preset time. delete The method of claim 1,
A storage unit for storing information on a time point at which the plurality of ultrasonic sensors emit each ultrasonic signal in a first detection period and a time point at which each ultrasonic signal is received by being reflected by the object; and
The processor,
In the second detection period, the plurality of ultrasound sensors emit each ultrasound signal, information on the time when each ultrasound signal is received by the object reflected, and the stored information for the first detection period In this way, among the ultrasonic signals received by the plurality of ultrasonic sensors, the ultrasonic signals radiated by each of the plurality of ultrasonic sensors and received are determined. The method of claim 3,
The preset time is,
In the preset detection period, the touch recognition apparatus is determined to be greater than a difference in reception time of the ultrasound signal according to a maximum movement distance that the touch recognition apparatus of the object can recognize. The method of claim 1,
The plurality of ultrasonic sensors,
A touch recognition device that has different frequencies of radiated ultrasonic signals. The method of claim 1,
The processor,
The touch recognition device for controlling the phases of the ultrasonic signals emitted from the plurality of ultrasonic sensors to be different from each other. The method of claim 1,
The processor,
A touch recognition device for controlling pulse durations of ultrasonic signals radiated from the plurality of ultrasonic sensors, respectively. The method of claim 1,
The processor,
In a third detection period, the touch recognition apparatus is configured to control the emission of a plurality of ultrasound signals at a time corresponding to a time point at which the plurality of ultrasound signals are respectively radiated in the first detection period. The method of claim 1,
It further includes a display unit,
The object is an object touched on the display unit, the touch recognition device. In the control method of a touch recognition device including a plurality of ultrasonic sensors,
Controlling the plurality of ultrasonic sensors to periodically emit ultrasonic signals according to different radiation time intervals;
Based on a reception time interval of the ultrasonic signals periodically received by each of the plurality of ultrasonic sensors and a radiation time interval of the ultrasonic signals periodically radiated from each of the plurality of ultrasonic sensors, among ultrasonic signals received by the plurality of ultrasonic sensors Determining an ultrasonic signal received by being radiated by each of the plurality of ultrasonic sensors; And
Including; detecting a touch point of the object based on the time of flight (ToF) of the ultrasonic signal received by being emitted by each of the plurality of ultrasonic sensors; and
The step of controlling the plurality of ultrasonic sensors,
Controlling the plurality of ultrasonic sensors to emit a first ultrasonic signal at the same time in a first detection section, and controlling the plurality of ultrasonic sensors to emit a second ultrasonic signal respectively at different times in a second detection section, Control method. delete The method of claim 12,
Controlling to emit each of the second ultrasonic signals,
A first ultrasonic sensor among the plurality of ultrasonic sensors controls the first ultrasonic sensor to emit ultrasonic signals according to a first radiation time interval,
The second ultrasonic sensor of the plurality of ultrasonic sensors controls the second ultrasonic sensor to emit ultrasonic signals according to a second radiation time interval in which the first radiation time interval is delayed by a preset time. delete The method of claim 12,
Storing information about a time point at which the plurality of ultrasonic sensors emit each ultrasonic signal in a first detection period and a time point at which each ultrasonic signal is received by reflection by the object; further comprising,
The step of detecting the touch point of the object,
In the second detection period, the plurality of ultrasound sensors emit each ultrasound signal, information on the time when each ultrasound signal is received by the object reflected, and the stored information for the first detection period In this way, among the ultrasonic signals received by the plurality of ultrasonic sensors, the ultrasonic signals radiated by each of the plurality of ultrasonic sensors and received are determined. The method of claim 14,
The preset time is,
In the preset detection period, the control method is determined to be greater than a difference in reception time of the ultrasound signal according to a maximum movement distance that the touch recognition apparatus of the object can recognize. The method of claim 12,
The plurality of ultrasonic sensors,
Control method of different frequencies of radiated ultrasonic signals. The method of claim 12,
The step of controlling the plurality of ultrasonic sensors,
The control method of controlling the phases of the ultrasonic signals radiated from the plurality of ultrasonic sensors to be different from each other. The method of claim 12,
The step of controlling the plurality of ultrasonic sensors,
The control method of controlling the pulse duration of the ultrasonic signals radiated from the plurality of ultrasonic sensors, respectively. The method of claim 12,
The step of controlling the plurality of ultrasonic sensors,
In a third detection period, a control method for controlling the plurality of ultrasound signals to be radiated respectively at a point in time corresponding to a point in time at which the plurality of ultrasound signals are respectively radiated in the first detection period.

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