KR102692045B1 - Touch apparatus - Google Patents

Abstract

A touch device according to an embodiment includes a touch panel including a plurality of first touch electrodes arranged in a first direction and a plurality of second touch electrodes arranged in a second direction crossing the first direction, and a plurality of touch electrodes during a first section. A driver that applies a first drive signal to the first touch electrodes, applies a second drive signal to the plurality of first touch electrodes and the plurality of second touch electrodes during the second section after the first section, and A receiver that receives a detection signal from a second touch electrode during a period, and receives a detection signal from a plurality of first touch electrodes and a plurality of second touch electrodes during a third period after the second period, and based on the signal output from the receiver It includes a control unit that determines the touch position.

Description

TOUCH APPARATUS}

This disclosure relates to touch devices.

A variety of terminals such as mobile phones, smart phones, tablet PCs, laptop computers, digital broadcasting terminals, PDAs (Personal Digital Assistants), PMPs (Portable Multimedia Players), and navigation devices are equipped with touch sensors. do.

In such a terminal, the touch sensor may be located on a display panel that displays an image, or may be located in an area of the terminal body. When a user interacts with the terminal by touching the touch sensor, the terminal can provide an intuitive user interface to the user.

Users can use a stylus pen for precise touch input. These stylus pens can transmit and receive signals with a touch sensor through electrical and/or magnetic methods.

Conventionally, in order to receive detection signals from touch electrodes included in the touch sensor, amplifiers corresponding to each of the touch electrodes were provided in the touch sensor.

Embodiments are intended to provide a touch device for receiving a detection signal from which noise components have been removed.

Embodiments are intended to provide a touch device for calculating the position of a touch input between two adjacent touch electrodes.

Embodiments are intended to provide a touch device that detects inputs from different touch objects in different sections within one frame.

To achieve the above or other purposes, a touch device according to an embodiment includes a plurality of first touch electrodes arranged in a first direction and a plurality of second touch electrodes arranged in a second direction intersecting the first direction. A touch panel that applies a first driving signal to a plurality of first touch electrodes during a first section and drives a second driving signal to the plurality of first touch electrodes and a plurality of second touch electrodes during a second section after the first section. A driver that applies a signal, a receiver that receives a detection signal from the second touch electrode during the first section, and a receiver that receives the detection signal from the plurality of first touch electrodes and the plurality of second touch electrodes during the third section after the second section. , and a control unit that determines the touch position based on the signal output from the receiver.

The driver may sequentially apply a pulse signal of a first frequency as a first drive signal to the plurality of first touch electrodes during the first section.

The receiver may be connected to each of the plurality of second touch electrodes during the first section and may include an amplification unit that amplifies and outputs a detection signal from the corresponding second touch electrode.

The driver may apply a pulse signal of a second frequency higher than the first frequency as a second driving signal to all of the plurality of first touch electrodes and the plurality of second touch electrodes during the second period.

The receiver may receive detection signals from both the first plurality of touch electrodes and the plurality of second touch electrodes during the third period.

The driver does not apply the second driving signal to the plurality of first touch electrodes and the plurality of second touch electrodes during the third period.

*The receiver may include a plurality of differential amplification units that simultaneously receive detection signals from both the plurality of first touch electrodes and the plurality of second touch electrodes during the third period.

The plurality of differential amplifiers may receive only the third detection signal generated by the second touch object in response to the second driving signal during the third section.

The controller may determine the third detection signal as a valid touch signal based on whether the signal strength of the third detection signal exceeds the second threshold.

The plurality of differential amplifiers includes a first differential amplifier that receives detection signals from two first touch electrodes spaced apart by at least one first touch electrode, and a first differential amplifier that receives detection signals from two first touch electrodes spaced apart by at least one first touch electrode. It may include a second differential amplifier that receives detection signals from the two second touch electrodes.

The detection signal may include at least one of a first detection signal by a first touch object and a second detection signal by a second touch object.

The control unit determines the detection signal as a valid touch signal based on whether the signal strength of the detection signal received in response to the first driving signal during the first section exceeds the first threshold, and determines the first detection signal as a valid touch signal. A first threshold may be set so that the second detection signal is filtered.

The first touch object may include at least one of a finger and a palm, and the second touch object may be a stylus pen.

A touch device according to another embodiment includes a touch panel including a plurality of first touch electrodes arranged in a first direction and a plurality of second touch electrodes arranged in a second direction crossing the first direction, and a plurality of touch electrodes during a first section. A driver for applying a first driving signal to a first touch electrode and applying a second driving signal to a plurality of first touch electrodes and a plurality of second touch electrodes during a second section after the first section, a second section A plurality of differential amplifiers that receive detection signals from a plurality of first touch electrodes and a plurality of second touch electrodes during the subsequent third period, and a control unit that determines the touch position based on the signals output from the plurality of differential amplifiers. Includes.

During the third period, the plurality of differential amplifiers may simultaneously receive detection signals from both the plurality of first touch electrodes and the plurality of second touch electrodes.

During the third period, the driver does not apply the second driving signal to the plurality of first touch electrodes and the plurality of second touch electrodes.

The plurality of differential amplifiers may receive only the third detection signal generated by the second touch object in response to the second driving signal during the third section.

The third detection signal may be determined as a valid touch signal based on whether the signal strength of the third detection signal exceeds the second threshold.

The plurality of differential amplifiers includes a first differential amplifier that receives detection signals from two first touch electrodes spaced apart by at least one first touch electrode, and a first differential amplifier that receives detection signals from two first touch electrodes spaced apart by at least one first touch electrode. It may include a second differential amplifier that receives detection signals from the two second touch electrodes.

The detection signal may include at least one of a first detection signal by a first touch object and a second detection signal by a second touch object.

Among the plurality of differential amplifiers, each of the first differential amplifiers is connected to each of the plurality of second touch electrodes during the first section, amplifies and outputs the detection signal from the corresponding second touch electrode, and the controller is connected to each of the plurality of second touch electrodes during the first section. The detection signal is determined as a valid touch signal based on whether the signal strength of the detection signal received in response to the first driving signal exceeds the first threshold, the first detection signal is determined as a valid touch signal, and the second detection signal is To filter, a first threshold may be set.

The first touch object may include at least one of a finger and a palm, and the second touch object may be a stylus pen.

The frequency of the first driving signal may be less than or equal to the frequency of the second driving signal.

According to embodiments, there is an advantage of improving the reception sensitivity of touch input.

According to embodiments, there is an advantage of being able to calculate a more accurate touch position.

According to embodiments, there is an advantage in being able to accurately detect input by different touch objects.

1 is a diagram schematically showing a touch device according to an embodiment.
Figure 2 is a diagram illustrating an example of a stylus pen touching a touch device according to an embodiment.
Figure 3 is a flowchart showing a touch detection method according to an embodiment.
FIG. 4 is a waveform diagram showing an example of a driving signal according to the touch detection method of FIG. 3.
Figure 5 is a diagram showing a portion of a conventional touch panel and a receiver.
FIG. 6 is a waveform diagram showing an example of a received signal received by two electrodes of the touch panel shown in FIG. 5.
Figure 7 is a diagram showing a portion of a touch panel and a receiver according to an embodiment.
FIG. 8 is a waveform diagram showing an example of a received signal received by two electrodes of the touch panel shown in FIG. 7.
9 to 11 are diagrams showing the touch device of FIG. 1 in more detail.
FIG. 12 is a waveform diagram showing an example of a driving signal and a received signal according to the touch detection method of FIG. 3.
FIG. 13 is a diagram showing a part of a receiving unit that outputs the received signal of FIG. 12.
FIG. 14 is a waveform diagram showing another example of a driving signal and a received signal according to the touch detection method of FIG. 3.
FIG. 15 is a diagram showing a part of a receiving unit that outputs the received signal of FIG. 14.
Figure 16 is a graph showing the magnitude of the received signal of Figures 12 and 14.
Figures 17 and 18 are diagrams showing touch areas of different objects.
FIG. 19 is a block diagram showing a touch device and a host performing the driving method of FIG. 3.
FIG. 20 is a diagram illustrating an example of touch data provided from a touch device to a host.

Hereinafter, with reference to the attached drawings, various embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The invention may be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are assigned the same reference numerals throughout the specification.

In addition, the size and thickness of each component shown in the drawing are arbitrarily shown for the convenience of explanation, so the present invention is not necessarily limited to what is shown. In the drawing, the thickness is shown by enlarging it to clearly express several layers and regions. And in the drawing, for the convenience of explanation, the thickness of some layers and regions is shown exaggeratedly.

Additionally, when a part of a layer, membrane, region, plate, etc. is said to be “on” or “on” another part, this includes not only cases where it is “directly above” another part, but also cases where there is another part in between. . Conversely, when a part is said to be “right on top” of another part, it means that there is no other part in between. In addition, being “on” or “on” a reference part means being located above or below the reference part, and does not necessarily mean being located “above” or “on” the direction opposite to gravity. .

In addition, throughout the specification, when a part is said to "include" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

Hereinafter, a touch device and a touch detection method thereof according to embodiments will be described with reference to the necessary drawings.

FIG. 1 is a diagram schematically showing a touch device according to an embodiment, and FIG. 2 is a diagram showing an example of a stylus pen touching a touch device according to an embodiment.

Referring to FIG. 1 , a touch device 10 according to an embodiment includes a touch panel 100 and a touch controller 102 that controls the touch panel 100 . The touch controller 102 may include first and second driving/receiving units 110 and 120 that transmit and receive signals to and from the touch panel 100, and a control unit 130.

The touch panel 100 includes a plurality of first touch electrodes 111-1 to 111-m extending in a first direction and a plurality of second touch electrodes 111-1 to 111-m extending in a second direction intersecting the first direction. It includes touch electrodes 121-1 to 121-n. Within the touch panel 100, a plurality of first touch electrodes 111-1 to 111-m may be arranged along a second direction, and a plurality of second touch electrodes 121-1 to 121-n may be It may be arranged along the first direction. In FIG. 1, the shape of the touch panel 100 is shown as a square, but the shape is not limited thereto.

As shown in FIG. 2, the touch panel 100 further includes a substrate 105 and a window 103. A plurality of first touch electrodes 111-1 to 111-m and a plurality of second touch electrodes 121-1 to 121-n may be positioned on the substrate 105. Additionally, a window 103 may be positioned on the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n. In FIG. 2, the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n are shown as being located on the same layer, but are respectively located on different layers. You may do so, but you are not limited to this.

A plurality of first touch electrodes 111-1 to 111-m are connected to the first driving/receiving unit 110, and a plurality of second touch electrodes 121-1 to 121-n are connected to the second driving/receiving unit 110. It is connected to (120). In Figure 1, the first driving/receiving unit 110, the second driving/receiving unit 120, and the control unit 130 are shown separately, but may be implemented as a single module, unit, or chip, and are limited to this. It doesn't work.

The first driving/receiving unit 110 may apply a driving signal to the plurality of first touch electrodes 111-1 to 111-m. Additionally, the first driving/receiving unit 110 may receive detection signals from the plurality of first touch electrodes 111-1 to 111-m. Likewise, the second driving/receiving unit 120 may apply a driving signal to the plurality of second touch electrodes 121-1 to 121-n. Additionally, the second driving/receiving unit 120 may receive detection signals from the plurality of first touch electrodes 121-1 to 121-n. That is, the first driving/receiving unit 110 and the second driving/receiving unit 120 may be a type of transceiver that transmits and receives signals, and may include a driving unit and a receiving unit, respectively.

The driving signal may include a signal (eg, sine wave, square wave, etc.) having a frequency corresponding to the resonance frequency of the stylus pen 20. The resonance frequency of the stylus pen 20 depends on the design value of the resonance circuit portion 23 of the stylus pen.

The touch device 10 may be used to detect touch input (direct touch or proximity touch) by a touch object. As shown in FIG. 2 , a touch input of the stylus pen 20 close to the touch panel 100 may be detected by the touch device 10 .

The stylus pen 20 may include a conductive tip 21, a resonance circuit 23, a ground 25, and a body 27.

The conductive tip 21 is at least partially formed of a conductive material (eg, metal, conductive rubber, conductive fabric, conductive silicon, etc.), and may be electrically connected to the resonance circuit 23 .

The resonance circuit 23 is an LC resonance circuit, and is connected to a plurality of first touch electrodes 111-1 to 1 from at least one of the first driving/receiving unit 110 and the second driving/receiving unit 120 through the conductive tip 21. 111-m) and at least one type of electrode among the plurality of second touch electrodes 121-1 to 121-n may resonate with a driving signal applied to all of them.

The resonance signal generated when the resonance circuit 23 resonates with the driving signal may be output to the touch panel 100 through the conductive tip 21. A section in which a driving signal is applied to all of at least one type of electrodes among the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n and the subsequent section. In, a resonance signal due to resonance of the resonance circuit 23 may be transmitted to the conductive tip 21. The resonance circuit 23 is located within the body portion 27 and may be electrically connected to the ground portion 25.

The stylus pen 20 of this type generates a touch input by generating a resonance signal in response to a driving signal applied to at least one of the touch electrodes 111-1 to 111-m and 121-1 to 121-n. You can.

A capacitance Cx is formed by at least one of the touch electrodes 111-1 to 111-m and 121-1 to 121-n and the conductive tip 21 of the stylus pen 20. A driving signal is transmitted to the stylus pen 20 through a capacitance (Cx) between at least one of the touch electrodes (111-1 to 111-m, 121-1 to 121-n) and the conductive tip 21. , the resonance signal may be transmitted to the touch panel 100.

The touch device 10 is a touch object (e.g., a user's body part (finger, palm, etc.), passive or active) other than the stylus pen 20 that uses the method of generating the resonance signal described above. ) type stylus pen) can be detected, but is not limited to this.

For example, the touch device 10 detects a touch by a stylus pen that receives an electric signal and outputs it as a magnetic field signal. For example, the touch device 10 may further include a digitizer. A touch may be detected by detecting a magnetic field signal electromagnetic resonance (or electromagnetic induction) by the stylus pen by the digitizer. Alternatively, the touch device 10 detects a touch by a stylus pen that receives a magnetic field signal and outputs it as a resonated magnetic field signal. For example, the touch device 10 may further include a coil that applies current as a driving signal and a digitizer. The stylus pen resonates with the magnetic field signal generated from the current-applied coil. The touch of the stylus pen can be detected by detecting an electromagnetic resonance (or electromagnetic induction) magnetic field signal by a digitizer.

The control unit 130 controls the operation of the touch device 10 and may output touch coordinate information in response to a touch detection result of the touch device 10.

Next, with reference to FIG. 3, a touch detection method according to an embodiment will be described.

Figure 3 is a flowchart showing a touch detection method according to an embodiment.

In the first section, the touch device 10 operates in the first mode (S10). The first mode is a mode in which a driving signal for detecting a touch input by a touch object other than the stylus pen 20 is applied to the touch panel 100.

For example, in the first mode, the first driving/receiving unit 110 outputs a driving signal to a plurality of first touch electrodes 111-1 to 111-m, and the second driving/receiving unit 120 outputs a driving signal to a plurality of first touch electrodes 111-1 to 111-m. A detection signal according to touch is received from the second touch electrodes 121-1 to 121-n.

The control unit 130 determines whether the detection signal is a valid touch signal based on whether the signal size of the detection signal obtained in the first section exceeds the first threshold, and acquires touch coordinate information using the valid touch signal. You can.

For example, when the signal size of the detection signal obtained in the first section exceeds the first threshold, the control unit 130 calculates touch coordinates using the detection signal. If the signal size of the detection signal obtained in the first section is less than or equal to the first threshold, the control unit 130 does not calculate touch coordinates according to the detection signal whose signal size is less than or equal to the first threshold. Additionally, if the signal size of the detection signal obtained in the first section exceeds the first threshold, the control unit 130 may calculate the touch area using the detection signal. The detection signal obtained in the first section includes at least one of a first detection signal from a user's body part (finger, palm, etc.), a second detection signal from the stylus pen 20, and a passive stylus pen. The first threshold may be set so that the first detection signal is determined to be a valid touch signal and the second detection signal is filtered.

In the first sub-section of the second section, the touch device 10 operates in the second mode (S12). The second mode is a mode in which a driving signal for detecting a touch input by the stylus pen 20 is applied to the touch panel 100. For example, the first driving/receiving unit 110 simultaneously applies a driving signal to all of the plurality of first touch electrodes 111-1 to 111-m.

In the above, it has been described that in the first sub-section, the first driving/receiving unit 110 simultaneously applies the driving signal to all of the plurality of first touch electrodes 111-1 to 111-m, but in the second section, the second driving/receiving unit 110 The driving/receiving unit 120 simultaneously applies a driving signal to all of the plurality of second touch electrodes 121-1 to 121-n, or the first driving/receiving unit 110 and the second driving/receiving unit 120 At the same time, a driving signal may be applied to all of the first plurality of touch electrodes 111-1 to 111-m and a driving signal may be applied to all of the plurality of second touch electrodes 121-1 to 121-n. The first driving/receiving unit 110 and the second driving/receiving unit 120 use both the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n. When applying a driving signal to , the driving signal applied to the plurality of first touch electrodes 111-1 to 111-m and the driving signal applied to the plurality of second touch electrodes 121-1 to 121-n The phase is assumed to be the same, but is not limited thereto.

It is assumed that the frequency of the driving signal applied to the touch panel 100 in the first section is less than or equal to the frequency of the driving signal applied to the touch panel 100 in the first sub-section.

In the second sub-section of the second section, the touch device 10 receives a resonance detection signal based on the driving signal (S14).

For example, the resonance circuit unit 23 of the stylus pen 20 resonates with a driving signal, thereby generating a resonance signal and transmitting it to the touch panel 100 through the conductive tip 21. Then, the first driving/receiving unit 110 receives detection signals transmitted from the plurality of first touch electrodes 111-1 to 111-m, and the second driving/receiving unit 120 receives the plurality of second touch electrodes 111-1 to 111-m. A detection signal transmitted from the electrodes 121-1 to 121-n is received. The first driving/receiving unit 110 and the second driving/receiving unit 120 may process the received detection signal and transmit it to the control unit 130.

The control unit 130 determines whether the detection signal is detected based on whether the signal size of the detection signal obtained in the second sub-section exceeds the second threshold, and uses the valid touch signal to determine whether the touch of the stylus pen 20 is Touch coordinate information of the point where the touch occurred can be obtained.

For example, if the signal size of the detection signal obtained in the third section exceeds the second threshold, the control unit 130 calculates touch coordinates using the detection signal. If the signal size of the detection signal obtained in the third section is less than or equal to the second threshold, the control unit 130 does not calculate touch coordinates according to the detection signal whose signal size is less than or equal to the second threshold. Additionally, if the signal size of the detection signal obtained in the third section exceeds the second threshold, the control unit 130 may calculate the touch area using the detection signal.

Next, with reference to FIG. 4 , the driving signal applied in the first and second sections and the resonance signal of the stylus pen 20 will be described.

FIG. 4 is a waveform diagram showing an example of a driving signal according to the touch detection method of FIG. 3.

In the first section T1, the first driving/receiving unit 110 uses at least one of the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n. A driving signal is output to one type of touch electrode. When the first driving/receiving unit 110 outputs a driving signal to the plurality of first touch electrodes 111-1 to 111-m, the second driving/receiving unit 120 outputs the driving signal to the plurality of second touch electrodes 121-1 to 111-m. to 121-n) can receive a detection signal. The control unit 130 may obtain touch coordinate information based on the signal size of the detection signal.

In the first sub-section T21 within the second section T2, the first driving/receiving unit 110 simultaneously applies a driving signal to the plurality of first touch electrodes 111-1 to 111-m, and The driving/receiving unit 120 simultaneously applies a driving signal to the plurality of second touch electrodes 121-1 to 121-n.

In the first sub-section T21, the frequency of the driving signal applied to the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n is the stylus pen. It corresponds to the resonance frequency in (20). For example, the frequency of the driving signal output to the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n during the first sub-interval T21 may be a frequency within an offset of 25 kHz centered at 500 kHz. On the other hand, in the first section T1, the frequency of the driving signal output to the plurality of first touch electrodes 111-1 to 111-m is set to be different from the resonance frequency of the stylus pen 20. For example, the frequency of the driving signal output to the plurality of first touch electrodes 111-1 to 111-m during the first section T1 may be set to around 150 kHz. This frequency setting of the driving signal is only an example and may be set to a different value than the above.

In the second sub-section T22 within the second section T2, the first driving/receiving unit 110 receives a detection signal from the plurality of first touch electrodes 111-1 to 111-m, and performs a second driving operation. /The receiver 120 receives detection signals from the plurality of second touch electrodes 121-1 to 121-n.

Even after the application of the driving signal is terminated in the second sub-section T22, the resonance signal output by the resonance circuit 23 of the stylus pen 20 is connected to the plurality of first touch electrodes 111-1 to 111-m and It may be received by at least one of the plurality of second touch electrodes 121-1 to 121-n.

The second section (T2) includes a plurality of first sub-sections (T21) and second sub-sections (T22). For example, within the second section (T2), the combination of the first sub-sections (T21) and second sub-sections (T22) can be repeated eight times.

Although it has been described above that the second section (T2) exists after the first section (T1), the first section (T1) may exist after the second section (T2), and the first section (T1) and the second section (T1) may exist after the second section (T2). The time length of the two sections T2 may each be changed within several frames, and the driving method of the touch device 10 of the embodiment is not limited thereto.

Next, a detection signal when a touch is input between two adjacent touch electrodes will be described with reference to FIGS. 5 to 8 .

FIG. 5 is a diagram showing a portion of a conventional touch panel and a driving unit, FIG. 6 is a waveform diagram showing an example of a received signal received by two electrodes of the touch panel shown in FIG. 5, and FIG. 7 is a diagram showing an example of a received signal according to an embodiment. This is a diagram showing a part of the touch panel and the driver, and FIG. 8 is a waveform diagram showing an example of a received signal received by two electrodes of the touch panel shown in FIG. 7.

First, as shown in FIG. 5, the first receiving unit 1100 of the first driving/receiving unit 110 includes a plurality of differential amplifiers (or differential amplifiers) 113-1 and 113-2 and an ADC unit 115. ), and a signal processing unit (DSP, 117). The second receiving unit 1200 of the second driving/receiving unit 120 includes a plurality of differential amplifiers 123-1 and 123-2, an ADC unit 125, and a signal processing unit (DSP, 127).

Specifically, the differential amplifier (113-1 and 113-2, 123-1 and 123-2) is an amplifier ( It can be implemented with an amplifier).

In general, signals received from touch electrodes include not only desired signals but also noise. This noise degrades the quality of the signal and reduces the sensitivity of the system. In the case of display noise generated from the display, the noise is introduced at a similar size to all channels. Therefore, when the difference between the detection signals received by the two touch electrodes is amplified, the noise components cancel each other out, and only the difference in the signals is amplified, thereby obtaining a good quality signal.

The input terminals of each differential amplifier (113-1 and 113-2, 123-1 and 123-2) are respectively connected to two adjacent touch electrodes. Specifically, the differential amplifier 113-1 is connected to the first touch electrodes 111-1 and 111-2 adjacent to each other, and the differential amplifier 113-2 is connected to the first touch electrodes 111-1 and 111-2 adjacent to each other. 111-3, 111-4). And the differential amplifier 123-1 is connected to the second touch electrodes 121-1 and 121-2 adjacent to each other, and the differential amplifier 123-2 is connected to the second touch electrodes 121-1 and 121-2 adjacent to each other. 3, 121-4).

Each differential amplifier (113-1 and 113-2, 123-1 and 123-2) may differentially amplify and output two detection signals transmitted from touch electrodes connected to the input terminal.

In FIG. 5, when a point TP between two adjacent touch electrodes 111-1 and 111-2 is touched, the differential amplifier connected to the two touch electrodes 111-1 and 111-2 (113-1) amplifies the difference between the two detection signals. The control unit 130 uses the signal output by the differential amplifier 113-1 to determine whether the detection signal from the two touch electrodes 111-1 and 111-2 is a valid touch signal. However, since the detection signals received from the two touch electrodes 111-1 and 111-2 have the same size and phase or are very similar, the signal output by the differential amplifier 113-1 has a very small size. has

As shown in FIG. 6, in the second sub-interval T22, the detection signals R_111-1 and R-111-2 from the two touch electrodes 111-1 and 111-2 are similar to each other. It can have size and phase. Accordingly, the signal (O_113-1) output by the differential amplifier 113-1 has a very small signal size (ΔVa). Therefore, there is a problem that it is difficult to detect a touch input to one point (TP).

If the differential amplifier 113-1 receives a detection signal from two adjacent touch electrodes, the detection signal caused by a touch in the area between the first touch electrode 111-1 and the first touch electrode 111-2 Even if they are differentially amplified by the differential amplification unit 113-1, their value is not large enough. Therefore, when the differential amplifier 113-1 is connected to two adjacent touch electrodes, touch sensitivity deteriorates.

As shown in FIG. 7, the input terminals of each differential amplifier (113-1 and 113-2, 123-1 and 123-2) are connected to two touch electrodes spaced apart from each other by at least one touch electrode. It is connected. Specifically, the differential amplifier 113-1 is connected to the first touch electrodes 111-1 and 111-3 spaced apart by the first touch electrode 111-2, and the differential amplifier 113 -2) is connected to the first touch electrodes 111-2 and 111-4 spaced apart by the first touch electrode 111-3. And the differential amplifier 123-1 is connected to the second touch electrodes 121-1 and 121-3 spaced apart by the second touch electrode 121-2, and the differential amplifier 123-2 ) is connected to the second touch electrodes 121-2 and 121-4 spaced apart by the second touch electrode 121-2.

In FIG. 7, when a point TP between two adjacent touch electrodes 111-1 and 111-2 is touched, the differential amplifier connected to the two touch electrodes 111-1 and 111-3 (113-1) amplifies the difference between the two detection signals. The control unit 130 uses the signal output by the differential amplifier 113-1 to determine whether the detection signal from the two touch electrodes 111-1 and 111-3 is a valid touch signal. However, since the signal sizes between the detection signals received from the two touch electrodes 111-1 and 111-3 are different, the signal output by the differential amplifier 113-1 may have a size greater than the threshold. .

As shown in FIG. 8, in the second sub-interval T22, the detection signals R_111-1 and R-111-2 from the two touch electrodes 111-1 and 111-2 are different from each other. It can have any size. Accordingly, the signal (O_113-1) output by the differential amplifier 113-1 has a signal magnitude (ΔVb) greater than or equal to the threshold. That is, the differential amplifier 113-1 receives detection signals from the first touch electrode 111-1 and the first touch electrode 111-3, which are spaced apart from each other by at least one touch electrode, so that the touch The detection signal by the touch electrode at the input position can be differentially amplified to have a sufficiently large value, and touch sensitivity can be improved.

Next, the first and second driving/receiving units 110 and 120 of the touch device 10 will be described in detail with reference to FIGS. 9 and 11 .

FIG. 9 is a diagram illustrating in more detail a touch device operating in the first section T1.

First, Figure 9 is a diagram showing a touch device in the first section. As shown, the first driver 1110 of the first driver/receiver 110 includes a plurality of amplifiers 112-1 to 112-m. A plurality of amplifiers 112-1 to 112-m are connected to a plurality of first touch electrodes 111-1 to 111-m to output a first driving signal.

The second receiver 1200 includes a plurality of amplifier units 123-1 to 123-n, an ADC unit 125, and a signal processor (DSP, 127). The second driving/receiving unit 1200 may sequentially receive detection signals from a plurality of second touch electrodes 121-1 to 121-n in units of one second touch electrode. Alternatively, the second driving/receiving unit 1200 may simultaneously receive detection signals through a plurality of second touch electrodes 121-1 to 121-n.

Each of the plurality of amplifier units 123-1 to 123-n is connected to a corresponding second touch electrode among the plurality of second touch electrodes 121-1 to 121-n. Specifically, each of the plurality of amplifier units 123-1 to 123-n may be implemented as an amplifier in which one of two input terminals is connected to ground or a direct current voltage, and a detection signal is input to the other input terminal. Each of the plurality of amplifiers 123-1 to 123-n amplifies and outputs the detection signals transmitted from the plurality of second touch electrodes 121-1 to 121-n in parallel.

The ADC unit 125 converts the amplified detection signal into a digital signal. Then, the signal processing unit 127 processes the plurality of amplified signals converted into digital signals and transmits them to the control unit 130.

Next, this is a diagram showing a touch device operating in the first sub-section T21 of the second section T2.

As shown, a plurality of amplifiers 112-1 to 112-m of the first driver 1110 are connected to a plurality of first touch electrodes 111-1 to 111-m to perform the second drive. Output a signal. The second driver 1210 also includes a plurality of amplifier units 122-1 to 122-n. The plurality of amplifier units 122-1 to 122-n are connected to the plurality of first touch electrodes 121-1 to 121-n to output a third driving signal.

Next, FIG. 11 is a diagram showing a touch device operating in the second sub-section T22 of the second section T2. As shown, the first receiver 1100 includes a plurality of differential amplifiers (or differential amplifiers) 113-1 to 113-i, an ADC unit 115, and a signal processor (DSP, 117). . The second receiver 1200 includes a plurality of differential amplifiers 123-1 to 123-j, an ADC 125, and a signal processor 127 (DSP).

The plurality of differential amplifiers 113-1 to 113-i and 123-1 to 123-j may be configured by changing the connection of the input terminals of the plurality of amplifiers 123-1 to 123-n. That is, i+j≤n may be possible. Specifically, among the two input terminals of the amplification unit 123-1, the ground or the input terminal connected to the direct current voltage is connected to the corresponding second touch electrode 121-4, and among the two input terminals of the amplification unit 123-1, the ground or DC voltage terminal is connected to the corresponding second touch electrode 121-4. By connecting the input terminal to which a direct current voltage is connected to the corresponding second touch electrode 121-5, two touch electrodes can be connected to one amplifier unit.

The input terminal of each differential amplifier (113-1 to 113-i, 123-1 to 123-j) is connected to two touch electrodes spaced apart from each other by at least one touch electrode. Each differential amplifier (113-1 to 113-i, 123-1 to 123-j) may differentially amplify and output the two detection signals transmitted from the touch electrode. Each differential amplifier (113-1 to 113-i, 123-1 to 123-j) receives the detection signal from two touch electrodes and differentially amplifies it, so even if the driving signal is applied to a plurality of touch electrodes simultaneously, saturation occurs. It doesn't work.

Each of the differential amplifiers 113-1 to 113-i and 123-1 to 123-j may receive a detection signal from two touch electrodes spaced apart from each other, rather than from two adjacent touch electrodes. For example, each differential amplifier (113-1 to 113-i, 123-1 to 123-j) receives a detection signal from two touch electrodes spaced apart with one or more touch electrodes in between. In Figure 11, the differential amplifier 113-1 receives detection signals from the touch electrode 111-1 and the touch electrode 111-5. If the differential amplifier 113-1 receives a detection signal from two adjacent touch electrodes (for example, the first touch electrode 111-1 and the first touch electrode 111-2), the first touch electrode Even if the detection signals generated by touch in the area between 111-1 and the first touch electrode 111-2 are differentially amplified by the differential amplifier 113-1, their value is not sufficiently large. Therefore, when the differential amplifier 113-1 is connected to two adjacent touch electrodes, touch sensitivity deteriorates. However, since the differential amplifier 113-1 receives the detection signal from the first touch electrode 111-1 and the first touch electrode 111-5, the detection signal from the touch electrode at the position where the touch was input is It can be differentially amplified to a sufficiently large value, and touch sensitivity can be improved.

Each ADC unit (115, 125) converts the differentially amplified detection signal into a digital signal. Then, each signal processing unit 117 and 127 processes a plurality of differential amplified signals converted into digital signals and transmits them to the control unit 130.

This touch detection method will be described with reference to FIGS. 12 to 16.

FIG. 12 is a waveform diagram showing an example of a driving signal and a received signal according to the touch detection method of FIG. 3, and FIG. 13 is a diagram showing a part of a receiver that outputs the received signal of FIG. 11.

12 and 13, a touch by a finger is performed on the area where the first touch electrodes 111-1 and 111-2 and the second touch electrodes 121-1, 121-2, and 121-3 intersect. Assume it exists.

As shown in FIG. 12, in the first section T1, the first driving signals D_111-1 to D_111-m are sequentially applied to the plurality of first touch electrodes 111-1 to 111-m. . The first driving signals (D_111-1 to D_111-m) are pulse signals having an enable level voltage (VE) and a disable level voltage (VD).

The second receiver 1200 receives detection signals R_121-1 to R_121-n from the plurality of second touch electrodes 121-1 to 121-n.

The first driving signals D_111-1 to D_111-m are driving signals for detecting a touch input by a touch object other than the stylus pen 20, and are not limited to the waveform shown in FIG. 12. In FIG. 12 , the first driving signals (D_111-1 to D_111-m) are shown to be sequentially applied to the plurality of first touch electrodes (111-1 to 111-m), but the plurality of first touch electrodes (111-1 to 111-m) are shown in FIG. Driving signals having different frequencies (for example, frequencies having an orthogonal relationship with each other) may be applied simultaneously to 1 to 111-m. In this case, the second receiver 1200 receives detection signals according to touch from a plurality of second touch electrodes 121-1 to 121-n, and uses band-pass filters of different frequency bands to transmit the detection signals to the first touch electrodes 121-1 to 121-n. Each touch electrode (111-1 to 111-m) can be separated.

As shown in FIG. 13, the detection signal (R_121-1) from the second touch electrode 121-1 is amplified and output through the corresponding amplification unit 123-1, and the second touch electrode 121-1 2) The detection signal (R_121-2) is amplified and output through the corresponding amplification unit 123-1, and the detection signal (R_121-3) from the second touch electrode 121-3 is amplified and output. It may be amplified and output through the unit 123-1, and the detection signal (R_121-4) from the second touch electrode 121-4 may be amplified and output through the corresponding amplification unit 123-1. In the detection signals (R_121-1, R_121-2, and R_121-3), signal size changes due to touch occur as ΔV0, ΔV1, and ΔV2, respectively.

The control unit 130 controls the first touch electrodes 111-1 and 111-2 to which a driving signal is applied when a change in signal size occurs and the second touch electrodes 121-1 and 121-2 to which a change in signal size occurs. , 121-3) can be calculated as touch coordinates.

Next, in the first sub-interval T21, the second driving signals (D_111-1 to D_111-m) are applied to all of the plurality of first touch electrodes 111-1 to 111-m, and the plurality of second touch electrodes 111-1 to 111-m are applied. The third driving signal D_121 is applied to all of the touch electrodes 121-1 to 121-n. The second and third driving signals (D_111, D_121) have an enable level voltage (VE) and a disable level voltage (VD), and are pulse signals with a frequency similar to the resonance frequency of the stylus pen 20. .

In the first sub-interval T21, reception of detection signals from the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n is not performed. .

In the second sub-interval T22, the first receiver 1100 and the second receiver 1200 use a plurality of first touch electrodes 111-1 to 111-m and a plurality of second touch electrodes 121-1 to 111-m. 121-n) Detection signals can be received from everyone.

Here, the second section T2 includes a plurality of first sub-sections T21 and second sub-sections T22. For example, within the second section T2, the combination of the first sub-section T21 and the second sub-section T22 may be repeated eight times.

11 and 13 , since no touch by the stylus pen 20 occurs, a detection signal is not received in the second sub-section T22.

FIG. 14 is a waveform diagram showing another example of a driving signal and a received signal according to the touch detection method of FIG. 3, and FIG. 15 is a diagram showing a part of a driving unit that outputs the received signal of FIG. 14.

In FIGS. 14 and 15 , it is assumed that there is a touch by the stylus pen 20 in the area where the first touch electrode 111-2 and the second touch electrode 121-5 intersect.

As shown in FIG. 14, in the first section T1, the first driving signals D_111-1 to D_111-m are sequentially applied to the plurality of first touch electrodes 111-1 to 111-m. . The second receiver 1200 receives detection signals R_121-1 to R_121-n from the plurality of second touch electrodes 121-1 to 121-n.

Since the stylus pen 20 is close to the second touch electrode 121-5, the signal size change value ΔV3 of the detection signal R_121-5 from the second touch electrode 121-5 is amplified. It can be amplified and output through the unit 123-5.

Next, in the first sub-section T21 within the second section T2, the second driving signals D_111-1 to D_111-m are applied to all of the plurality of first touch electrodes 111-1 to 111-m. The third driving signal D_121 is applied to all of the plurality of second touch electrodes 121-1 to 121-n. The second and third driving signals (D_111, D_121) have an enable level voltage (VE) and a disable level voltage (VD), and are pulse signals with a frequency similar to the resonance frequency of the stylus pen 20. .

In Figure 14, the enable level voltage (VE) and the disable level voltage (VD) of the second and third driving signals (D_111 and D_121) are explained as being the same and in-phase signals, but the present invention It is not limited to this. In the first sub-interval T21, the size of the pen resonance signal increases according to the time when the second and third driving signals D_111 and D_121 are applied. And after a certain period of time has passed, the size of the pen resonance signal is saturated.

In the first sub-interval T21, reception of detection signals from the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n is not performed. .

Thereafter, when the first sub-interval T21 ends, the first driver 1110 stops applying the driving signal D_111, and the second driver 1210 also stops applying the driving signal D_121. During the second sub-interval T22 within the second interval T2, a driving signal ( D_111, D_121) are not authorized.

In the second sub-interval T22, the first receiver 1100 and the second receiver 1200 use a plurality of first touch electrodes 111-1 to 111-m and a plurality of second touch electrodes 121-1 to 111-m. 121-n) Detection signals can be received from everyone. The first receiver 1100 and the second receiver 1200 may receive the pen resonance signal in the second sub-interval T22 where the driving signals D_111 and D_121 are not applied as a detection signal.

As shown in FIG. 15, a detection signal (R_111-2) from the first touch electrode 111-2 with a touch and a detection signal (R_111-6) from the first touch electrode 111-6 without a touch ) of the signal size difference (ΔV4) may be amplified and output through the differential amplifier 113-2. Likewise, the signal size difference ( ΔV5) may be amplified and output through the differential amplifier 123-1.

The control unit 130 controls the first touch electrodes 111-1 and 111-2 to which a driving signal is applied when a signal size difference occurs and the second touch electrodes 121-2 and 121-3 to which a signal size difference occurs. ) can be calculated as touch coordinates.

The control unit 130 may calculate the touch position on the touch panel 100 through the detection signal received in the second sub-interval T22.

According to the touch device 10 according to an embodiment, the differential amplifier 113-1 includes a first touch electrode 111-1 and a first touch electrode 111-1 spaced apart from each other by at least one touch electrode. Since the detection signal is received from 3), the detection signal by the touch electrode at the position where the touch is input can be differentially amplified to have a sufficiently large value, and touch sensitivity can be improved.

In addition, the touch device 10 according to one embodiment includes a plurality of first touch electrodes 111-1 to 111-m and a plurality of second touch electrodes 121-1 to 121-m in the second sub-section T22. n) Since the detection signal is received through both, there is an advantage of being able to quickly acquire touch coordinates along two axes that intersect each other.

In addition, the touch device 10 according to one embodiment includes a plurality of first touch electrodes 111-1 to 111-m and a plurality of second touch electrodes 121-1 to 121-n in the first section T1. ) There is an advantage that the size of the resonance signal of the stylus pen 20 in response to this is improved by simultaneously applying the same driving signal (D_111, D_121) to all of them.

In the above description, detection signal reception may be performed at least once in the second sub-interval T22 by at least one of the first receiver 1100 and the second receiver 1200. Additionally, the time at which the detection signal is received may be at least one time within the second sub-interval T22, but is not limited thereto.

Next, the magnitude of the detection signal received in each of the first section T1 and the first sub-section T21 will be described with reference to FIG. 16.

Figure 16 is a graph showing the magnitude of the received signal of Figures 12 and 14. 1 frame (1 FRAME) includes a first section (T1) and a first sub-section (T21). The first sub-interval T21 includes a first sub-interval T21 and a second sub-interval T22. When the second sub-interval T22 ends, the first interval of the next frame starts.

In the first section T1, the size difference between the signals detected by the finger is ΔV1 and ΔV2, which exceeds the first threshold (Threshold1). In the first section T1, the difference in size of the detection signal by the stylus pen 20 is ΔV3, which is less than or equal to the first threshold (Threshold1).

According to an embodiment, the control unit 130 determines a detection signal having a size difference exceeding the first threshold Threshold1 in the first section T1 as a valid touch signal. The first threshold (Threshold1) is such that the first detection signal by the user's body part (finger, palm, etc.) is determined as a valid touch signal and the second detection signal by the stylus pen 20 and the passive stylus pen is filtered. can be set.

Therefore, the control unit 130 determines the detection signal by the finger as a valid touch signal and calculates the touch coordinates using the detection signal. The control unit 130 determines that the detection signal by the stylus pen 20 is not a valid touch signal and does not calculate touch coordinates.

In the first sub-interval T21, the size difference between the detection signals by the stylus pen 20 is ΔV4 and ΔV5, which exceeds the second threshold (Threshold2).

The controller 130 determines a detection signal having a size difference exceeding the second threshold Threshold2 in the first sub-interval T21 as a valid touch signal. Therefore, the control unit 130 determines the detection signal from the stylus pen 20 as a valid touch signal and calculates the touch coordinates using the detection signal.

Conventionally, when different types of objects touch a touch sensor together, touch coordinates are calculated using only the detection signal in the first section T1, so that the touch position by a touch object with a small change in signal size is accurately calculated. There was a difficult problem.

According to embodiments, the first threshold (Threshold1) determines that the first detection signal by the user's body part (finger, palm, etc.) is a valid touch signal, and the first detection signal by the stylus pen 20 and the passive stylus pen 2 The detection signal is set to be filtered. Accordingly, in the first section T1, touch coordinates by a touch object with a large change in signal size can be accurately detected, and in the first sub-section T21, touch coordinates by a touch object with a small change in signal size can be accurately detected. You can.

Next, with reference to FIGS. 17 and 18, the touch area according to the touch object will be described.

17 and 18 are diagrams showing the touch area of different objects.

As shown in FIG. 17, the finger 30 touches the touch panel 100. A plurality of touch electrodes 111-3 to 111-5 and 121-4 to 121-6 may be located near the area A1 where the tip of the finger 30 contacts the touch panel 100. The area of the touch area A1 may be calculated using detection signals received from the plurality of touch electrodes 111-3 to 111-5 and 121-4 to 121-6.

As shown in FIG. 18, the stylus pen 40 touches the touch panel 100. One first touch electrode 111-6 and one second touch electrode 121-6 may be located near the area A2 where the tip of the stylus pen 40 contacts the touch panel 100. . Alternatively, two first touch electrodes and two second touch electrodes may be located near the area A2 where the tip of the stylus pen 40 contacts the touch panel 100. That is, the tip of the stylus pen 40 is located in the area A2 in contact with the touch panel 100 more than the number of touch electrodes located in the area A1 where the tip of the finger 30 is in contact with the touch panel 100. The number of touch electrodes is smaller. Accordingly, the area of the touch area A2 by the touch of the stylus pen 40 is calculated to be a very small value compared to the area of the touch area A1 by the touch of the finger 30.

According to embodiments, the touch device 10 may transmit touch data including information about the area of the touch area to the host device. Through this, the host device can identify whether the touch object is the finger 30 or the stylus pen 40.

According to embodiments, the touch device 10 may determine a touch object according to the calculated area of the touch area and transmit touch data including information about the determined touch object to the host device.

Regarding touch data, it will be described with reference to FIGS. 19 and 20.

FIG. 19 is a block diagram showing a touch device and a host according to an embodiment, and FIG. 20 is a diagram showing an example of touch data provided from a touch device to a host.

Referring to FIG. 19 , the host 50 may receive touch data from the touch controller 102 included in the touch device 10. For example, the host 50 may include a mobile System-on-Chip (SoC), an Application Processor (AP), a Media Processor, a microprocessor, a Central Processing Unit (CPU), or It may be a similar device.

After one frame ends, the touch device 10 may generate touch data related to the touch input during one frame and transmit it to the host 50.

Alternatively, when the first section T1 ends, the touch device 10 generates information about the touch input during the first section T1 as touch data and transmits it to the host 50, and the first section T1 When the continuous first sub-interval T21 ends, information about the touch input during the first sub-interval T21 may be generated as touch data and transmitted to the host 50.

Referring to FIG. 20 , touch data 60 may include a touch count field 61 and at least one touch entity field 62 and 63.

A value representing the number of touches input during one frame period may be entered in the touch count field 61. For example, when the touch coordinates by one finger are calculated in the first section (T1) within one frame section and the touch coordinates by one stylus pen are calculated in the first sub-section (T21), the touch count field In (61), a value indicating that two touches are input is entered.

The touch entity fields 62 and 63 include fields indicating information about each touch input. For example, the touch entity fields 62 and 63 include a flag field 620, an X-axis coordinate field 621, a Y-axis coordinate field 622, a Z value field 623, an area field 624, and a touch action Includes field 625.

The number of touch entity fields 62 and 63 may be the same as the value written in the touch count field 61.

A value representing a touch object may be entered in the flag field 620. For example, the finger, palm, and stylus pen may be entered into the flag field 620 with different values. A value representing the calculated touch coordinate may be entered in the X-axis coordinate field 621 and the Y-axis coordinate field 622. A value corresponding to the signal strength of the detection signal may be entered in the Z value field 623. A value corresponding to the area of the touched area may be entered in the area field 624.

According to embodiments, the host device 50 that has received the touch data 60 uses the value of the area field 624 to determine that the touch object is the finger 30 if the touch area is greater than the threshold, and determines that the touch object is the finger 30. If the area is less than or equal to the threshold, it is determined that the touch object is the stylus pen 40.

According to embodiments, the host device 50 that has received the touch data 60 may use the value of the flag field 620 to identify whether the touch object is the finger 30 or the stylus pen 40. there is.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. It falls within the scope of rights.

Claims (25)

A touch panel including a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction crossing the first direction,
Applying a first driving signal to at least one of the plurality of first electrodes during a first period, and applying a second driving signal to at least one of the plurality of first electrodes during a second period following the first period. driving part,
At least one first electrode that receives a detection signal from the second electrode during the first period and applies the first driving signal during a third period after the second period and a detection signal from the plurality of second electrodes a receiving unit that receives, and
A control unit that determines the touch position based on the signal output from the receiver
Including,
The first driving signal has a different frequency from the second driving signal,
Touch device. According to paragraph 1,
The driver applies a pulse signal of a first frequency as the first drive signal to at least one first electrode to which the first drive signal is applied during the first section,
Touch device. According to paragraph 2,
The receiving unit is connected to each of the plurality of second electrodes during the first section and includes an amplifying unit that amplifies and outputs a detection signal from the corresponding second electrode,
Touch device. According to paragraph 2,
The driver applies a pulse signal of a second frequency higher than the first frequency to all of the plurality of second electrodes and at least one first electrode to which the second drive signal is applied during the second period. Authorized as,
Touch device. According to paragraph 1,
The receiver receives a detection signal from both at least one first electrode and the plurality of second electrodes to which the first driving signal is applied during the third period,
Touch device. According to paragraph 1,
The driver does not apply the second drive signal to at least one first electrode and the plurality of second electrodes to which the first drive signal is applied during the third period,
Touch device. According to paragraph 1,
The receiving unit includes a plurality of differential amplifiers that simultaneously receive detection signals from both at least one first electrode and the plurality of second electrodes to which the first driving signal is applied during the third period,
Touch device. In clause 7,
The plurality of differential amplifiers receive only a third detection signal generated in response to the second driving signal during the third section,
Touch device. According to clause 8,
The control unit determines the third detection signal as a valid touch signal based on whether the signal strength of the third detection signal exceeds a second threshold.
Touch device. delete According to paragraph 1,
The detection signal during the first section includes at least one of a first detection signal by a first touch object and a second detection signal by a second touch object,
Touch device. According to clause 11,
The controller converts the detection signal received in response to the first drive signal into a valid touch signal based on whether the signal strength of the detection signal received in response to the first drive signal during the first section exceeds a first threshold. decide,
The first threshold is set such that the first detection signal is determined to be a valid touch signal and the second detection signal is filtered,
Touch device. According to clause 11,
The first touch object includes at least one of a finger and a palm,
The second touch object is a stylus pen,
Touch device. A touch panel including a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction crossing the first direction,
A driver configured to apply a first driving signal to the plurality of first electrodes during a first section and to apply a second driving signal to at least one of the plurality of first electrodes during a second section following the first section,
A plurality of differential amplifiers receiving detection signals from at least one first electrode to which the first driving signal is applied and the plurality of second electrodes during a third period after the second period, and
A control unit that determines the touch position based on the signals output from the plurality of differential amplifiers.
Including,
The first driving signal has a different frequency from the second driving signal,
Touch device. According to clause 14,
During the third period, the plurality of differential amplifiers simultaneously receive detection signals from both at least one first electrode to which the first driving signal is applied and the plurality of second electrodes,
Touch device. According to clause 14,
During the third period, the driver does not apply the second drive signal,
Touch device. According to clause 14,
The plurality of differential amplifiers receive only a third detection signal generated by a second touch object in response to the second driving signal during the third section,
Touch device. According to clause 17,
Determining the third detection signal as a valid touch signal based on whether the signal strength of the third detection signal exceeds a second threshold,
Touch device. delete According to clause 14,
The detection signal includes at least one of a first detection signal by a first touch object and a second detection signal by a second touch object,
Touch device. According to clause 20,
Each of the first differential amplifiers among the plurality of differential amplifiers is connected to each of the plurality of second electrodes during the first section, amplifies and outputs a detection signal from the corresponding second electrode,
The control unit determines the detection signal as a valid touch signal based on whether the signal strength of the detection signal received in response to the first driving signal during the first section exceeds a first threshold,
The first threshold is set such that the first detection signal is determined to be a valid touch signal and the second detection signal is filtered,
Touch device. According to clause 20,
The first touch object includes at least one of a finger and a palm,
The second touch object is a stylus pen,
Touch device. According to clause 14,
The frequency of the first driving signal is less than the frequency of the second driving signal,
Touch device. A touch panel including a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction crossing the first direction,
A driver configured to apply a first drive signal to at least one of the plurality of first electrodes during a first section and to apply a second drive signal to the plurality of second electrodes during a second section following the first section,
At least one first electrode that receives a detection signal from the second electrode during the first period and applies the first driving signal during a third period after the second period and a detection signal from the plurality of second electrodes a receiving unit that receives, and
A control unit that determines the touch position based on the signal output from the receiver
Including,
The first driving signal has a different frequency from the second driving signal,
Touch device. A touch panel including a plurality of first electrodes arranged in a first direction and a plurality of second electrodes arranged in a second direction crossing the first direction,
A driver configured to apply a first driving signal to the plurality of first electrodes during a first section and to apply a second driving signal to the plurality of second electrodes during a second section following the first section,
A plurality of differential amplifiers receiving detection signals from at least one first electrode to which the first driving signal is applied and the plurality of second electrodes during a third period after the second period, and
A control unit that determines the touch position based on the signals output from the plurality of differential amplifiers.
Including,
The first driving signal has a different frequency from the second driving signal,
Touch device.