Touch device

Abstract

A touch device 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; a driver configured to apply a first driving signal detecting a first touch object to the first touch electrode during a first time period, and apply a second driving signal detecting a second touch object to the second touch electrode during a second time period after the first time period, the second touch object being different from the first touch object; a receiver configured to receive a detection signal from the second touch electrode during a first time period, and receive detection signals from the first touch electrode and the second touch electrode during a third time period after the second time period; and a controller configured to determine a touch position based on the signal output from the receiver, a frequency of the first driving signal being different from a frequency of a second driving signal, the frequency of the second driving signal corresponding to a resonant frequency of a second touch object.

Description

[0001] This application is a divisional application of the invention patent application with the application date of January 13, 2020, application number "202080011987.0", and invention name "Touch Device". Technical Field

[0002] The invention relates to a touch device. Background Art

[0003] Various terminals such as mobile phones, smart phones, tablet computers, laptop computers, digital broadcast terminals, PDAs (Personal Digital Assistants), PMPs (Portable Multimedia Players), and navigation devices include touch sensors.

[0004] In such a terminal, the touch sensor may be provided on a display panel displaying an image, or may be provided in a region of a terminal body. When a user interacts with the terminal by touching the touch sensor, the terminal may provide the user with an intuitive user interface.

[0005] The user can use a stylus for complex touch input. The stylus can send signals to the touch sensor and receive signals from the touch sensor electrically and / or magnetically.

[0006] Conventionally, an amplifier corresponding to each touch electrode is provided in the touch sensor in order to receive a detection signal from the touch electrode included in the touch sensor. Summary of the invention

[0007] Technical issues

[0008] Exemplary embodiments attempt to provide a touch device for receiving a detection signal from which a noise component has been removed.

[0009] Example embodiments attempt to provide a touch device for calculating a position of a touch input between two adjacent touch electrodes.

[0010] Exemplary embodiments attempt to provide a touch device that detects inputs of different touch objects at different time periods within one frame.

[0011] Technical Solution

[0012] To achieve the above-mentioned purpose or other purposes, one aspect of the present invention provides a touch device, comprising: a touch panel, the touch panel comprising a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction intersecting the first direction; a driver, the driver being configured to apply a first drive signal to the first touch electrode during a first time period, and to apply a second drive signal to the second touch electrode during a second time period after the first time period; a receiver, the receiver being configured to receive a detection signal from the second touch electrode during the first time period, and to receive a detection signal from the first touch electrode and the second touch electrode during a third time period after the second time period; and a controller, the controller being configured to determine a touch position based on a signal output from the receiver.

[0013] During the first period, the driver may sequentially apply a pulse signal having a first frequency to the first touch electrodes as a first driving signal.

[0014] The receiver may include an amplifier connected to each second touch electrode during the first period to amplify and output a detection signal from the corresponding second touch electrode.

[0015] During the second period, the driver may apply a pulse signal of a second frequency higher than or equal to the first frequency as a second driving signal to both the first touch electrode and the second touch electrode.

[0016] The receiver may receive detection signals from both the first touch electrode and the second touch electrode during the third period.

[0017] During the third period, the driver may not apply the second driving signal to the first touch electrodes and the second touch electrodes.

[0018] The receiver may include a plurality of differential amplifiers that simultaneously receive the detection signals from both the first touch electrode and the second touch electrode during the third period.

[0019] During the second 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.

[0020] The controller may determine whether the third detection signal is a valid touch signal based on whether the signal strength of the third detection signal exceeds a second threshold.

[0021] The differential amplifier may include: a first differential amplifier configured to receive detection signals from two first touch electrodes separated by at least one first touch electrode; and a second differential amplifier configured to receive detection signals from two second touch electrodes separated by at least one second touch electrode.

[0022] The detection signal may include at least one of a first detection signal generated by the first touch object and a second detection signal generated by the second touch object.

[0023] The controller can determine whether the detection signal is 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 time period exceeds a first threshold, and determine the first detection signal as a valid touch signal, while setting the first threshold to filter out the second detection signal.

[0024] 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.

[0025] An exemplary embodiment of the present invention provides a touch device, comprising: a touch panel including a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction intersecting the first direction; a driver configured to apply a first drive signal to the first touch electrodes during a first time period, and to apply a second drive signal to the second touch electrodes during a second time period after the first time period; a plurality of differential amplifiers configured to receive detection signals from the first touch electrodes and the second touch electrodes during a third time period after the second time period; and a controller configured to determine a touch position based on a signal output from the differential amplifier.

[0026] During the third period, the differential amplifier may simultaneously receive detection signals from both the first touch electrode and the second touch electrode.

[0027] During the third period, the driver may not apply the second driving signal to the first touch electrodes and the second touch electrodes.

[0028] During the second 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.

[0029] Whether the third detection signal is a valid touch signal may be determined based on whether the signal strength of the third detection signal exceeds a second threshold.

[0030] The differential amplifier may include: a first differential amplifier configured to receive detection signals from two first touch electrodes spaced apart by at least one first touch electrode; and a second differential amplifier configured to receive detection signals from two second touch electrodes spaced apart by at least one second touch electrode.

[0031] The detection signal may include at least one of a first detection signal generated by the first touch object and a second detection signal generated by the second touch object.

[0032] Each first differential amplifier in the differential amplifiers can be connected to each second touch electrode during a first time period to amplify and output a detection signal from the corresponding second touch electrode, and the controller can determine whether the detection signal is 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 time period exceeds the first threshold, and the first detection signal can be determined as a valid touch signal, and the first threshold is set to filter out the second detection signal.

[0033] 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.

[0034] The frequency of the first driving signal may be less than or equal to the frequency of the second driving signal.

[0035] Beneficial Effects

[0036] According to the exemplary embodiment, the reception sensitivity of the touch input may be improved.

[0037] According to the exemplary embodiment, the touch position may be accurately calculated.

[0038] According to the exemplary embodiment, inputs of different touch objects may be accurately detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A touch device according to an exemplary embodiment is schematically illustrated.

[0040] Figure 2 An example of a stylus pen touching a touch device according to an exemplary embodiment is shown.

[0041] Figure 3 A touch detection method according to an exemplary embodiment is schematically illustrated.

[0042] Figure 4 Shows the display according to Figure 3 1 is a waveform diagram of an example of a driving signal of a touch detection method.

[0043] Figure 5 A touch panel and a receiver according to conventional technology are partially shown.

[0044] Figure 6 Shows the display by Figure 5 FIG. 1 is a waveform diagram of an example of reception signals received by two electrodes of the touch panel shown.

[0045] Figure 7 A touch panel and a driver according to an exemplary embodiment are partially shown.

[0046] Figure 8 Shows the display by Figure 7 FIG. 1 is a waveform diagram of an example of reception signals received by two electrodes of the touch panel shown.

[0047] Figures 9 to 11 More details are shown Figure 1 touch device.

[0048] Fig.12 Shows the display according to Figure 3 FIG. 1 is a waveform diagram of an example of a driving signal and a receiving signal of a touch detection method.

[0049] Fig.13 shows the output Fig.12 The part of the receiver that receives the signal.

[0050] Fig.14 Shows the display according to Figure 3 FIG. 1 is a waveform diagram of another example of a driving signal and a receiving signal of a touch detection method.

[0051] Fig.15 shows the output Fig.14 The part of the receiver that receives the signal.

[0052] Fig.16 Shows the display Fig.12 and Fig.14 A graph of the amplitude of the received signal.

[0053] Fig.17 and Fig.18 The touch areas of different objects are shown.

[0054] Fig.19 shows the display execution Figure 3 Block diagram of a touch device and a host of a driving method.

[0055] Fig. 20 An example of touch data provided from a touch device to a host is shown. DETAILED DESCRIPTION

[0056] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. Those skilled in the art will appreciate that the described embodiments may be modified in various different ways without departing from the spirit or scope of the present invention.

[0057] In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals refer to the same or similar constituent elements throughout the specification.

[0058] In addition, since the sizes and thicknesses of the constituent elements shown in the drawings are arbitrarily given for better understanding and ease of description, the present invention is not limited to the sizes and thicknesses shown. In the drawings, the thicknesses of layers, films, panels, regions, etc. are exaggerated for clarity. In the drawings, the thicknesses of some layers and regions are exaggerated for better understanding and ease of description.

[0059] It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or there can be intervening elements. Conversely, when an element is referred to as being "directly on" another element, there are no intervening elements. In addition, the terms "above" or "on" refer to being positioned above or below an object part, and do not necessarily mean being positioned on the upper side of an object part based on the direction of gravity.

[0060] In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “comprising” or “including”, will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0061] Hereinafter, a touch device and a touch detection method thereof according to exemplary embodiments will be described with reference to necessary drawings.

[0062] Figure 1 schematically shows a touch device according to an exemplary embodiment, Figure 2 An example of a stylus pen touching a touch device according to an exemplary embodiment is shown.

[0063] Reference Figure 1 , the touch device 10 according to an exemplary embodiment includes a touch panel 100 and a touch controller 102 for controlling the touch panel 100. The touch controller 102 may include first and second drivers / receivers 110 and 120 and a controller 130 for transmitting and receiving signals to and from the touch panel 100.

[0064] 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 121-1 to 121-n extending in a second direction crossing the first direction. In the touch panel 100, the first touch electrodes 111-1 to 111-m may be arranged in the second direction, and the second touch electrodes 121-1 to 121-n may be arranged in the first direction. Figure 1 , the shape of the touch panel 100 is illustrated as a quadrangle, but the present invention is not limited thereto.

[0065] like Figure 2As shown, the touch panel 100 further includes a substrate 105 and a window 103. The first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n may be disposed on the substrate 105. The window 103 may be disposed on the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n. Figure 2 , the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n are shown to be disposed on the same layer 101, but may be on different layers, respectively, and the present invention is not limited thereto.

[0066] The first touch electrodes 111-1 to 111-m are connected to the first driver / receiver 110, and the second touch electrodes 121-1 to 121-n are connected to the second driver / receiver 120. Figure 1 In the embodiment, the first driver / receiver 110 and the second driver / receiver 120 are separated from each other, but may be implemented as one module, unit or chip, and the present invention is not limited thereto.

[0067] The first driver / receiver 110 may apply a driving signal to the first touch electrodes 111-1 to 111-m. In addition, the first driver / receiver 110 may receive a detection signal from the first touch electrodes 111-1 to 111-m. Similarly, the second driver / receiver 120 may apply a driving signal to the second touch electrodes 121-1 to 121-n. In addition, the second driver / receiver 120 may receive a detection signal from the first touch electrodes 121-1 to 121-n. That is, the first driver / receiver 110 and the second driver / receiver 120 may be a transceiver for sending and receiving signals, and each may include a driver and a receiver.

[0068] The driving signal may include a signal (eg, a sine wave, a square wave, etc.) having a frequency corresponding to the resonant frequency of the stylus pen 20. The resonant frequency of the stylus pen 20 depends on a design value of the resonant circuit portion 23 of the stylus pen.

[0069] The touch device 10 can be used to detect a touch input (direct touch or proximity touch) of a touch object. Figure 2 As shown, a touch input of the stylus pen 20 approaching the touch panel 100 may be sensed by the touch device 10 .

[0070] The stylus pen 20 may include a conductive tip 21 , a resonant circuit portion 23 , a ground line 25 , and a body 27 .

[0071] The conductive tip 21 may be at least partially formed of a conductive material (eg, metal, conductive rubber, conductive fabric, conductive silicon, etc.), and may be electrically connected to the resonant circuit portion 23 .

[0072] The resonant circuit portion 23 is an LC resonant circuit that can resonate with a driving signal applied from at least one of the first driver / receiver 110 and the second driver / receiver 120 to at least one of all electrodes of the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n through the conductive tip 21.

[0073] A resonance signal generated when the resonance circuit portion 23 resonates with the driving signal may be output to the touch panel 100 through the conductive tip 21. During a time period in which the driving signal is applied to at least one of all electrodes of the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n and during a subsequent time period, the driving signal caused by the resonance of the resonance circuit portion 23 may be transmitted to the conductive tip 21. The resonance circuit portion 23 may be provided in the body 27 and may be electrically connected to the ground line 25.

[0074] In this manner, the stylus pen 20 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.

[0075] The capacitance Cx is generated 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 20. Through the capacitance Cx generated 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 21, the driving signal and the resonance signal may be transmitted to the stylus 20 and the touch panel 100, respectively.

[0076] The touch device 10 may use the above-described method of generating a resonance signal to detect a touch of a touch object other than the stylus pen 20 (eg, a user's body (finger, palm, etc.), a passive stylus pen, or an active stylus pen).

[0077] For example, the touch device 10 detects the touch of a stylus pen, which receives an electrical signal and outputs it as a magnetic field signal. For example, the touch device 10 may also include a digitizer. The touch may be detected by detecting, by the digitizer, a magnetic field signal caused by electromagnetic resonance (or electromagnetic induction) of the stylus pen. Alternatively, the touch device 10 detects the touch of a stylus pen, which receives a magnetic field signal and outputs it as a resonant magnetic field signal. For example, the touch device 10 may also include a coil for applying a current as a drive signal and a digitizer. The stylus pen resonates with the magnetic field signal generated by the coil to which the current is applied. The touch may be detected by detecting, by the digitizer, a magnetic field signal caused by electromagnetic resonance (or electromagnetic induction) of the stylus pen.

[0078] The controller 130 may control driving of the touch device 10 , and may output touch coordinate information in response to a touch detection result of the touch device 10 .

[0079] Next, we will refer to Figure 3 A touch detection method according to an exemplary embodiment of the present invention is described.

[0080] Figure 3 A touch detection method according to an exemplary embodiment is schematically illustrated.

[0081] In the first period, the touch device 10 is driven in the first mode ( S10 ). The first mode is a mode in which a driving signal for detecting a touch input of a touch object other than the stylus pen 20 is applied to the touch panel 100 .

[0082] For example, in the first mode, the first driver / receiver 110 outputs a driving signal to the first touch electrodes 111 - 1 to 111 - m , and the second driver / receiver 120 receives a detection signal according to a touch from the second touch electrodes 121 - 1 to 121 - n .

[0083] The controller 130 may determine whether the detection signal is a valid touch signal based on whether the signal amplitude of the detection signal acquired during the first period exceeds a first threshold value, and may obtain touch coordinate information by using the valid touch signal.

[0084] For example, when the signal amplitude of the detection signal acquired during the first time period exceeds the first threshold value, the controller 130 calculates the touch coordinates by using the detection signal. When the signal amplitude of the detection signal acquired in the first time period is less than or equal to the first threshold value, the controller 130 does not calculate the touch coordinates based on the detection signal having a signal amplitude less than or equal to the first threshold value. In addition, when the signal amplitude of the detection signal acquired in the first time period exceeds the first threshold value, the controller 130 can calculate the touch area by using the detection signal. The detection signal acquired in the first time period includes at least one of a first detection signal caused by a body part (fingers, palms, etc.) of the user and a second detection signal caused by the stylus 20 or a passive stylus. The first threshold value can be set so that the first detection signal is determined to be a valid touch signal and the second detection signal is filtered out.

[0085] During the first sub-period of the second period, the touch device 10 is driven in the second mode (S12). The second mode is a mode in which a driving signal for detecting a touch input of the stylus pen 20 is applied to the touch panel 100. For example, the first driver / receiver 110 applies a driving signal to all the first touch electrodes 111-1 to 111-m at the same time.

[0086] Although it has been described above that the first driver / receiver 110 applies the driving signal to all of the plurality of first touch electrodes 111-1 to 111-m at the same time during the first sub-period, the second driver / receiver 120 may apply the driving signal to all of the plurality of second touch electrodes 121-1 to 121-n at the same time during the second sub-period, or the first driver / receiver 110 and the second driver / receiver 120 may apply the driving signal to all of the plurality of first touch electrodes 111-1 to 111-m and to all of the plurality of second touch electrodes 121-1 to 121-n at the same time. When the first driver / receiver 110 and the second driver / receiver 120 provide the driving signal to both the plurality of first touch electrodes 111-1 to 111-m and the plurality of second touch electrodes 121-1 to 121-n, it is assumed that the driving signal applied to the first touch electrodes 111-1 to 111-m is in the same phase as the driving signal applied to the second touch electrodes 121-1 to 121-n, but the present invention is not limited thereto.

[0087] It is assumed that the frequency of the driving signal applied to the touch panel 100 during the first period is equal to or lower than the frequency of the driving signal applied to the touch panel 100 during the first sub-period.

[0088] During a second sub-period of the second period, the touch device 10 receives a resonance detection signal based on the driving signal ( S14 ).

[0089] For example, the resonant circuit portion 23 of the stylus pen 20 resonates with the driving signal to generate a resonant signal, which is transmitted to the touch panel 100 through the conductive tip 21. Then, the first driver / receiver 110 receives the detection signal transmitted from the first touch electrodes 111-1 to 111-m, and the second driver / receiver 120 receives the detection signal transmitted from the second touch electrodes 121-1 to 121-n. The first driver / receiver 110 and the second driver / receiver 120 may process the received detection signals to transmit them to the controller 130.

[0090] The controller 130 may determine whether the detection signal is a valid touch signal based on whether the signal amplitude of the detection signal acquired during the second sub-period exceeds the second threshold, and may obtain touch coordinate information related to the point where the touch of the stylus pen 20 occurs by using the valid touch signal.

[0091] For example, when the signal amplitude of the detection signal acquired during the third time period exceeds the second threshold value, the controller 130 calculates the touch coordinates by using the detection signal. When the signal amplitude of the detection signal acquired in the third time period is less than or equal to the second threshold value, the controller 130 does not calculate the touch coordinates based on the detection signal having a signal amplitude less than or equal to the second threshold value. In addition, when the signal amplitude of the detection signal acquired in the third time period exceeds the second threshold value, the controller 130 may calculate the touch area by using the detection signal.

[0092] Next, we will refer to Figure 4 The driving signals applied in the first and second time periods and the resonance signal of the stylus pen 20 are described.

[0093] Figure 4 Shows the display according to Figure 3 1 is a waveform diagram of an example of a driving signal of a touch detection method.

[0094] During the first time period T1, the first driver / receiver 110 outputs a driving signal to at least one of the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n. When the first driver / receiver 110 outputs a driving signal to the first touch electrodes 111-1 to 111-m, the second driver / receiver 120 may receive a detection signal from the second touch electrodes 121-1 to 121-n. The controller 130 may obtain touch coordinate information based on the signal amplitude of the detection signal.

[0095] During the first sub-period T21 of the second period T2, the first driver / receiver 110 simultaneously applies driving signals to the first touch electrodes 111-1 to 111-m, and the second driver / receiver 120 simultaneously applies driving signals to the second touch electrodes 121-1 to 121-n.

[0096] During the first sub-period T21, the frequency of the driving signal applied to the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n corresponds to the resonant frequency of the stylus 20. For example, the frequency of the driving signal output to the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n during the first sub-period T21 may be a frequency within an offset range of 25kHz to about 500kHz. In contrast, during the first period T1, the frequency of the driving signal output to the first touch electrodes 111-1 to 111-m is set to be different from the resonant frequency of the stylus 20. For example, the frequency of the driving signal output to the first touch electrodes 111-1 to 111-m during the first period T1 may be set to about 150kHz. The frequency setting of the driving signal is only an example and may be set to a value different from the above value.

[0097] During the first sub-period T22 of the second period T2, the first driver / receiver 110 receives detection signals from the first touch electrodes 111-1 to 111-m, and the second driver / receiver 120 receives detection signals from the second touch electrodes 121-1 to 121-n.

[0098] Even after the application of the driving signal is completed during the second sub-period T22, the resonance signal output by the resonance circuit portion 23 of the stylus pen 20 may be received by at least one of the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n.

[0099] The second time period T2 includes a plurality of first sub-time periods T21 and second sub-time periods T22. For example, during the second time period T2, the combination of the first sub-time period T21 and the second sub-time period T22 may be repeated 8 times.

[0100] Although the second time period T2 exists after the first time period T1, the first time period T1 may exist after the second time period T2, and the time lengths of the first time period T1 and the second time period T2 may be changed in each frame, respectively, and the driving method of the touch device 10 according to the exemplary embodiment is not limited thereto.

[0101] Next, we will refer to Figures 5 to 8 Describes a detection signal when a touch is input between two adjacent touch electrodes.

[0102] Figure 5 Partially showing a touch panel and a receiver according to conventional technology, Figure 6 Shows the display by Figure 5 The waveform diagram of an example of the received signal received by the two electrodes of the touch panel shown in FIG. Figure 7 A touch panel and a driver according to an exemplary embodiment are partially shown, and Figure 8 Shows the display by Figure 7 FIG. 1 is a waveform diagram showing an example of a received signal received by two electrodes of the touch panel.

[0103] First, if Figure 5 As shown, the first receiver 1100 of the first driver / receiver 110 includes a plurality of differential amplifiers 113-1 and 113-2, an ADC unit 115, and a digital signal processor (DSP) 117. The second receiver 1200 of the second driver / receiver 120 includes a plurality of differential amplifiers 123-1 and 123-2, an ADC unit 125, and a digital signal processor (DSP) 127.

[0104] Specifically, the differential amplifiers 113 - 1 and 113 - 2 and 123 - 1 and 123 - 2 may be implemented as amplifiers each having two input terminals, a first terminal of which receives one detection signal and a second terminal of which receives another detection signal.

[0105] Generally speaking, the signal received from the touch electrode receives not only the desired signal, but also noise. This noise reduces the signal quality, thereby reducing the sensitivity of the system, and in the case of noise being displayed on the display, the noise is introduced into all channels with a similar amplitude. Therefore, when amplifying the difference between the detection signals received by the two touch electrodes, the noise components can cancel each other out, and only the difference between the signals is amplified, thereby obtaining a signal of good quality.

[0106] The input terminals of the differential amplifiers 113-1 and 113-2 and 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 111-3 and 111-4 adjacent to each other. 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 121-3 and 121-4 adjacent to each other.

[0107] Each of the differential amplifiers 113 - 1 and 113 - 2 and 123 - 1 and 123 - 2 may differentially amplify and output two detection signals transmitted from the touch electrodes connected to the input terminal.

[0108] exist Figure 5 In the embodiment, when a point TP between two adjacent touch electrodes 111-1 and 111-2 is touched, the differential amplifier 113-1 connected to the two touch electrodes 111-1 and 111-2 amplifies the difference between the two detection signals. The controller 130 determines whether the detection signals from the two touch electrodes 111-1 and 111-2 are valid touch signals by using the signal output by the differential amplifier 113-1. However, since the amplitudes of the detection signals received from the two touch electrodes 111-1 and 111-2 are the same or very similar, the signal output by the differential amplifier 113-1 has a very small amplitude.

[0109] like Figure 6 As shown, during the second sub-period T22, the detection signals R_111-1 and R-111-2 from the two touch electrodes 111-1 and 111-2 have similar amplitudes and phases. Therefore, the signal O_113-1 output by the differential amplifier 113-1 has a very small signal amplitude ΔVa. Therefore, it is difficult to detect a touch input for a point TP.

[0110] When the differential amplifier 113-1 receives detection signals from two adjacent touch electrodes, the detection signal generated by the touch in the area between the first touch electrode 111-1 and the first touch electrode 111-2 is not large enough even when differentially amplified by the differential amplifier 113-1. Therefore, when the differential amplifier 113-1 is connected to two adjacent touch electrodes, the touch sensitivity decreases.

[0111] like Figure 7 As shown, the input terminals of the respective differential amplifiers 113-1 and 113-2 and 123-1 and 123-2 are connected to two touch electrodes spaced apart from each other by at least one touch electrode. Specifically, the differential amplifier 113-1 is connected to the first touch electrodes 111-1 and 111-3 spaced apart from 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 from the first touch electrode 111-3. The differential amplifier 123-1 is connected to the second touch electrodes 121-1 and 121-3 spaced apart from 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 from the second touch electrode 121-2.

[0112] exist Figure 7 In the embodiment, when a point TP between two adjacent touch electrodes 111-1 and 111-2 is touched, the differential amplifier 113-1 connected to the two touch electrodes 111-1 and 111-3 amplifies the difference between the two detection signals. The controller 130 determines whether the detection signals from the two touch electrodes 111-1 and 111-3 are valid touch signals by using the signal output by the differential amplifier 113-1. However, since the signal amplitudes between the detection signals received from the two touch electrodes 111-1 and 111-3 are different, the amplitude of the signal output by the differential amplifier 113-1 may be greater than or equal to the threshold.

[0113] like Figure 8 As shown, during the second sub-period T22, the detection signals R_111-1 and R-111-2 from the two touch electrodes 111-1 and 111-2 have different amplitudes. Therefore, the signal amplitude ΔVb of the signal O_113-1 output by the differential amplifier 113-1 is equal to or greater than the threshold. That is, since the differential amplifier 113-1 receives the detection signals from the first touch electrode 111-1 and the first touch electrode 111-3 which are spaced at least one touch electrode from each other, the detection signals generated by the touch electrodes at the touch input position can be differentially amplified to a sufficiently large value, thereby improving the touch sensitivity.

[0114] Next, we will refer to Fig. 9 and Fig.11The first driver / receiver 110 and the second driver / receiver 120 of the touch device 10 are described in detail.

[0115] Fig. 9 The touch device operating during the first time period T1 is shown in more detail.

[0116] first, Fig. 9 The touch device during the first time period is shown. As shown, the first driver 1110 of the first driver / receiver 110 includes a plurality of amplifiers 112-1 to 112-m. The amplifiers 112-1 to 112-m are connected to the first touch electrodes 111-1 to 111-m to output a first driving signal.

[0117] The second driver 1200 includes a plurality of amplifiers 123-1 to 123-n, an ADC unit 125, and a digital signal processor (DSP) 127. The second driver / receiver 1200 may sequentially receive detection signals of the second touch electrodes 121-1 to 121-n in units of one second touch electrode. Alternatively, the second driver / receiver 1200 may simultaneously receive detection signals from the second touch electrodes 121-1 to 121-n.

[0118] Each of the amplifiers 123-1 to 123-n is connected to a corresponding second touch electrode among the second touch electrodes 121-1 to 121-n. Specifically, each of the amplifiers 123-1 to 123-n can be implemented as an amplifier in which one of two input terminals is grounded or connected to a DC voltage, and a detection signal is input into the other input terminal. Each of the amplifiers 123-1 to 123-n amplifies the detection signals transmitted from the second touch electrodes 121-1 to 121-n in parallel to output the detection signals.

[0119] The ADC unit 125 converts the amplified detection signals into digital signals. The signal processing unit 127 processes the plurality of amplified signals converted into digital signals to transmit them to the controller 130.

[0120] then, Fig.10 The touch device is shown operating in the first sub-time period T21 of the second time period T2.

[0121] As shown in the figure, the amplifiers 112-1 to 112-m of the first driver 1110 are connected to the first touch electrodes 111-1 to 111-m to output the first driving signal. The second driver 1210 also includes a plurality of amplifiers 122-1 to 122-n. The amplifiers 122-1 to 122-n are connected to the first touch electrodes 121-1 to 121-n to output the third driving signal.

[0122] Next, Fig.11The touch device operating in the second sub-time period T22 of the second time period T2 is shown. As shown, the first receiver 1100 includes a plurality of differential amplifiers 113-1 to 113-i, an ADC unit 115, and a digital signal processor (DSP) 117. The second receiver 1200 includes a plurality of differential amplifiers 123-1 to 123-j, an ADC unit 125, and a digital signal processor (DSP) 127.

[0123] The differential amplifiers 113-1 to 113-i and 123-1 to 123-j can be configured by changing the connection of the input terminals of the amplifiers 123-1 to 123-n. That is, the inequality i+j≤n can be satisfied. Specifically, by connecting one of the two input terminals of the amplifier 123-1 connected to the ground or the DC voltage to the corresponding second touch electrode 121-4 and connecting one of the two input terminals of the amplifier 123-1 connected to the ground or the DC voltage to the corresponding second touch electrode 121-5, the two touch electrodes can be connected to one amplifier.

[0124] The input terminals of the respective differential amplifiers 113-1 to 113-i and 123-1 to 123-j are connected to two touch electrodes, which are separated from each other by at least one touch electrode. Each of the differential amplifiers 113-1 to 113-i and 123-1 to 123-j can differentially amplify and output two sensing signals transmitted from the touch electrodes. Each of the differential amplifiers 113-1 to 113-i and 123-1 to 123-j receives differential detection signals from two touch electrodes to differentially amplify the differential detection signals, so that even when the driving signal is applied to a plurality of touch electrodes at the same time, it is not saturated.

[0125] Each of the differential amplifiers 113-1 to 113-i and 123-1 to 123-j may receive detection signals from two touch electrodes spaced apart from each other instead of two adjacent touch electrodes. For example, each of the differential amplifiers 113-1 to 113-i and 123-1 to 123-j receives detection signals from two touch electrodes spaced apart from each other with one or more touch electrodes therebetween. Fig.11, the differential amplifier 113-1 receives detection signals from the touch electrode 111-1 and the touch electrode 111-5. When the differential amplifier 113-1 receives detection signals from two adjacent touch electrodes (e.g., the first touch electrode 111-1 and the first touch electrode 111-2), the detection signal caused by the touch in the area between the first touch electrode 111-1 and the first touch electrode 111-2 is not large enough even if differentially amplified by the differential amplifier 113-1. Therefore, when the differential amplifier 113-1 is connected to two adjacent touch electrodes, the touch sensitivity decreases. However, since the differential amplifier 113-1 receives detection signals from the first touch electrode 111-1 and the first touch electrode 111-5, the detection signal caused by the touch electrode at the touch input position can be differentially amplified to have a sufficiently large value, and the touch sensitivity can be improved.

[0126] Each of the ADC units 115 and 125 converts the differentially amplified detection signals into digital signals. Each of the signal processing units 117 and 127 processes the plurality of differentially amplified signals converted into digital signals to transmit them to the controller 130.

[0127] This touch detection method will refer to Figures 12 to 16 Describe together.

[0128] Fig.12 Shows the display according to Figure 3 An example waveform diagram of a driving signal and a receiving signal of a touch detection method, Fig.13 shows the output Fig.11 The part of the receiver that receives the signal.

[0129] exist Fig.12 and Fig.13 In the embodiment, it is assumed that there is a finger touch in a region where the first touch electrodes 111-1 and 111-2 and the second touch electrodes 121-1, 121-2, and 121-3 cross each other.

[0130] like Fig.12 As shown, during the first time period T1, the first driving signals D_111-1 to D_111-m are sequentially applied to the 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.

[0131] The second receiver 1200 receives detection signals R_121 ​​- 1 to R_121 ​​- n from the second touch electrodes 121 - 1 to 121 - n.

[0132] The first driving signals D_111 - 1 to D_111 - m are driving signals for detecting touch inputs of touch objects other than the stylus pen 20 , and are not limited to Fig.12 The waveform shown. Fig.12 The first drive signals D_111-1 to D_111-m are sequentially applied to the first touch electrodes 111-1 to 111-m, but drive signals with different frequencies (e.g., frequencies having an orthogonal relationship to each other) may be simultaneously applied to the first touch electrodes 111-1 to 111-m. In this case, the second receiver 1200 may receive detection signals based on touches from the second touch electrodes 121-1 to 121-n, and may separate the detection signals through the first touch electrodes 111-1 to 111-m using a bandpass filter having different frequency bands.

[0133] like Fig.13 As shown, the detection signal R_121-1 from the second touch electrode 121-1 can be amplified and output by the corresponding amplifier 123-1, the detection signal R_121-2 from the second touch electrode 121-2 can be amplified and output by the corresponding amplifier 123-1, the detection signal R_121-3 from the second touch electrode 121-3 can be amplified and output by the corresponding amplifier 123-1, and the detection signal R_121 ​​from the second touch electrode 121-4 can be amplified and output by the corresponding amplifier 123-1. In the detection signals R_121-1, R_121-2 and R_121-3, the changes in the signal amplitude caused by touch are respectively expressed as ΔV0, ΔV1 and ΔV2.

[0134] The controller 130 can calculate the points where the first touch electrodes 111-1 and 111-2 and the second touch electrodes 121-1, 121-2 and 121-3 intersect each other as touch coordinates, and when a change in signal amplitude is generated, a driving signal is applied to the first touch electrodes 111-1 and 111-2, and a signal amplitude change is generated in the second touch electrodes 121-1, 121-2 and 121-3.

[0135] Next, during the first sub-period T21, the second driving signals D_111-1 to D_111-m are applied to all of the first touch electrodes 111-1 to 111-m, and the third driving signal D_121 is applied to all of the second touch electrodes 121-1 to 121-n. The second driving signal D_111 and the third driving signal D_121 are pulse signals having an enable level voltage VE and a disable level voltage VD, and having a frequency similar to the resonant frequency of the stylus 20.

[0136] During the first sub-period T21, reception of detection signals from the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n is not performed.

[0137] During the second sub-period T22, the first receiver 1100 and the second receiver 1200 may receive detection signals from both the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n.

[0138] Here, the second time period T2 includes a plurality of first sub-time periods T21 and second sub-time periods T22. For example, during the second time period T2, the combination of the first sub-time period T21 and the second sub-time period T22 may be repeated 8 times.

[0139] exist Fig.11 and Fig.13 Since no touch of the stylus pen 20 occurs, no detection signal is received during the second sub-period T22.

[0140] Fig.14 Shows the display according to Figure 3 A waveform diagram of another example of a driving signal and a receiving signal of a touch detection method, Fig.15 shows the output Fig.14 The part of the driver that receives the signal.

[0141] exist Fig.14 and Fig.15 In the embodiment, it is assumed that there is a touch of the stylus pen 20 in a region where the first touch electrode 111 - 2 and the second touch electrode 121 - 5 cross each other.

[0142] like Fig.14 As shown, during the first time period T1, the first driving signals D_111-1 to D_111-m are sequentially applied to the first touch electrodes 111-1 to 111-m. The second receiver 1200 receives the detection signals R_121-1 to R_121-n from the second touch electrodes 121-1 to 121-n.

[0143] Since the stylus pen 20 is close to the second touch electrode 121 - 5 , the signal amplitude change value ΔV3 of the detection signal R_121 ​​- 5 from the touched second touch electrode 121 - 5 may be amplified and output by the amplifier 123 - 5 .

[0144] Next, during the first sub-period T21 in the second time period T2, the second drive signals D_111-1 to D_111-m are applied to all of the first touch electrodes 111-1 to 111-m, and the third drive signal D_121 is applied to all of the second touch electrodes 121-1 to 121-n. The second drive signal D_111 and the third drive signal D_121 are pulse signals having an enable level voltage VE and a disable level voltage VD, and having a frequency similar to the resonant frequency of the stylus 20.

[0145] exist Fig.14 In the embodiment, it is described that the phase signal of the enable level voltage VE of the second drive signal D_111 and the third drive signal D_121 is the same as the disable level voltage VD, but the present invention is not limited thereto. During the first sub-period T21, the amplitude of the pen resonance signal increases according to the time when the second drive signal D_111 and the third drive signal D_121 are applied. After a certain time, the amplitude of the pen resonance signal is saturated.

[0146] During the first sub-period T21, reception of detection signals from the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n is not performed.

[0147] Thereafter, when the first sub-period T21 ends, the first driver 1110 stops applying the driving signal D_111, and the second driver 1210 stops applying the driving signal D_121. During the second sub-period T22 in the second period T2, the driving signals D_111 and D_121 are not applied to the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n.

[0148] During the second sub-period T22, the first receiver 1100 and the second receiver 1200 may receive detection signals from both the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n. The first receiver 1100 and the second receiver 1200 may receive the pen resonance signal as the detection signal in the second sub-period T22 when the driving signals D_111 and D_121 are not applied.

[0149] like Fig.15As shown, the signal amplitude difference ΔV4 between the detection signal R_111-2 from the first touch electrode 111-2 with touch and the detection signal R_111-6 from the first touch electrode 111-6 without touch can be amplified and output by the differential amplifier 113-2. Similarly, the signal amplitude difference ΔV5 between the detection signal R_121-5 from the second touch electrode 121-5 with touch and the detection signal R_121-1 from the second touch electrode 121-1 without touch can be amplified and output by the differential amplifier 123-1.

[0150] The controller 130 may calculate points where the first touch electrodes 111-1 and 111-2 and the second touch electrodes 121-2 and 121-3 cross each other as touch coordinates, and when a signal amplitude difference is generated, a driving signal is applied to the first touch electrodes 111-1 and 111-2, and a signal amplitude difference is generated in the second touch electrodes 121-2 and 121-3.

[0151] The controller 130 may calculate a touch position on the touch panel 100 through the detection signal received in the second sub-period T22 .

[0152] According to the touch device 10 of the exemplary embodiment, since the differential amplifier 113-1 receives detection signals from the first touch electrode 111-1 and the first touch electrode 111-3 which are separated from each other by at least one touch electrode, the detection signals generated by the touch electrodes at the touch input position can be differentially amplified to have a sufficiently large value, and the touch sensitivity can be improved.

[0153] Furthermore, according to the touch device 10 of the exemplary embodiment, since detection signals are received by both the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n during the second sub-period, there is an advantage that touch coordinates along two axes intersecting each other can be quickly obtained.

[0154] Furthermore, according to the touch device 10 of the exemplary embodiment, the same driving signals D_111 and D_121 are simultaneously applied to the first touch electrodes 111-1 to 111-m and the second touch electrodes 121-1 to 121-n during the first period T1, thereby improving the resonance signal amplitude of the stylus pen 20 in response thereto.

[0155] In the above description, at least one of the first receiver 1100 and the second receiver 1200 may receive the detection signal at least once during the second sub-period. In addition, the time point at which the detection signal is received may be at least one time point in the second sub-period T22, but the present invention is not limited thereto.

[0156] Next, we will refer to Fig.16The amplitude of the detection signal received in each of the first time period T1 and the first sub-time period T21 is described.

[0157] Fig.16 Shows the display Fig.12 and Fig.14 1 frame (1FRAME) includes a first time period T1 and a first sub-time period T21. The first sub-time period T21 includes a plurality of first sub-time periods T21 and a plurality of second sub-time periods T22. When the second sub-time period T22 ends, the first time period of the next frame starts.

[0158] During the first time period T1, the amplitude difference of the detection signal of the finger is ΔV1 or ΔV2, which exceeds the first threshold Threshold 1. During the first time period T1, the amplitude difference of the detection signal of the stylus 20 is ΔV3, which is less than or equal to the first threshold Threshold 1.

[0159] According to an exemplary embodiment, the controller 130 determines the detection signal whose amplitude difference exceeds the first threshold Threshold1 as a valid touch signal during the first time period T1. The first threshold Threshold1 can be set so that the first detection signal of the user's body (finger, palm, etc.) is determined as a valid touch signal, while the second detection signal of the stylus 20 or the passive stylus is filtered out.

[0160] Therefore, the controller 130 determines the detection signal of the finger as a valid touch signal and calculates the touch coordinates by using the detection signal. The controller 130 determines that the detection signal of the stylus pen 20 is not a valid touch signal and does not calculate the touch coordinates.

[0161] During the first sub-time period T21 , the amplitude difference of the detection signal generated by the stylus pen 20 is ΔV4 or ΔV5 , which exceeds the second threshold Threshold2 .

[0162] During the first sub-period T21, the controller 130 determines the detection signal whose amplitude difference exceeds the second threshold Threshold2 as a valid touch signal. Therefore, the controller 130 determines the detection signal of the stylus pen 20 as a valid touch signal and calculates the touch coordinates by using the detection signal.

[0163] Conventionally, when different types of objects contact the touch sensor together, only the detection signal in the first period T1 is used to calculate the touch coordinates, and thus it is difficult to accurately calculate the touch position of the touch object with a small signal amplitude variation.

[0164] According to an exemplary embodiment, the first threshold Threshold1 may be set such that the first detection signal of the user's body (finger, palm, etc.) is determined as a valid touch signal, while the second detection signal of the stylus pen 20 or the passive stylus is filtered out. As a result, the touch coordinates of the touch object with a large signal amplitude change can be accurately detected during the first time period T1, and the touch coordinates of the touch object with a small signal amplitude change can be accurately detected during the first sub-time period T21.

[0165] Next, we will refer to Fig.17 and Fig.18 The description depends on the touch area of ​​the touch object.

[0166] Fig.17 and Fig.18 The touch areas of different objects are shown.

[0167] like Fig.17 As shown, 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 provided near an area A1 where the tip of the finger 30 contacts the touch panel 100. The area of ​​the touch area A1 may be calculated by using detection signals received from the touch electrodes 111-3 to 111-5 and 121-4 to 121-6.

[0168] like Fig.18 As shown, the stylus pen 40 touches the touch panel 100. One first touch electrode 111-6 and one second touch electrode 121-6 may be provided 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 provided near the area A2 where the tip of the stylus pen 40 contacts the touch panel 100. That is, the number of touch electrodes provided in the area A2 where the tip of the stylus pen 40 contacts the touch panel 100 is smaller than the number of touch electrodes provided in the area A1 where the finger 30 contacts the touch panel 100. Therefore, the area of ​​the touch area A2 generated by the touch of the stylus pen 40 is calculated, which is a very small value compared to the touch area A1 generated by the touch of the finger 30.

[0169] According to an exemplary embodiment, the touch device 10 may transmit touch data including information related to the area of ​​the touch region to the host device, so that the host device can recognize whether the touch object is the finger 30 or the stylus pen 40.

[0170] According to an exemplary embodiment, the touch device 10 may determine a touch object according to the calculated area of ​​the touch region, and may transmit touch data including information related to the determined touch object to the host device.

[0171] This will refer to Fig.19 and Fig. 20 describe.

[0172] Fig.19 A block diagram showing a method of manufacturing a display device according to an exemplary embodiment is shown, and Fig. 20 An example of touch data provided from a touch device to a host is shown.

[0173] Reference 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 be a mobile system on chip (APC), an application processor (AP), a media processor, a microprocessor, a central processing unit (CPU), or a device similar thereto.

[0174] After one frame ends, the touch device 10 may generate information related to the touch input during one frame as touch data to be transmitted to the host 50 .

[0175] Alternatively, when the first time period T1 ends, the touch device 10 may transmit the touch information input during the first time period T1 as touch data to the host 50, and when the first sub-time period T21 continuous with the first time period T1 ends, it may generate information related to the touch input during the first sub-time period T21 as touch data to transmit to the host 50.

[0176] Reference Fig. 20 , the touch data 60 may include a touch count field 61 and one or more touch entity fields 62 and 63 .

[0177] A value indicating the number of touches input during one frame period may be written in the touch count field 61. For example, when the touch coordinates of one finger are calculated during the first period T1 of one frame period, and the touch coordinates of one stylus are calculated during the first sub-period T21, a value indicating that two touches are input is written in the touch count field 61.

[0178] The touch entity fields 62 and 63 include fields indicating information related to each touch input. For example, the touch entity fields 62 and 63 may 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 field 625.

[0179] The number of touch entity fields 62 and 63 may be equal to the value written in the touch count field 61 .

[0180] A value representing a touch object may be written in the flag field 620. For example, a finger, a palm, and a stylus may be filled with different values ​​in the flag field 620. Values ​​representing calculated touch coordinates may be written 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 written in the Z value field 623. A value corresponding to the area of ​​the touch region may be written in the area field 624.

[0181] According to an exemplary embodiment, the host device 50 receiving the touch data 60 determines that the touch object is the finger 30 by using the value of the area field 624 when the touch area is greater than the threshold, and determines that the touch object is the stylus 40 when the touch area is less than or equal to the threshold.

[0182] According to an exemplary embodiment, the host device 50 receiving the touch data 60 may identify whether the touch object is the finger 30 or the stylus pen 40 by using the value of the flag field 620 .

[0183] While the invention has been described in connection with what are presently considered to be feasible exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A touch device, comprising: A touch panel comprising a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction intersecting the first direction; a driver configured to apply a first driving signal for detecting a first touch object to the first touch electrode during a first time period, and to apply a second driving signal for detecting a second touch object to the second touch electrode during a second time period after the first time period, the second touch object being different from the first touch object; a receiver configured to receive a detection signal from the second touch electrode during the first time period, and to receive detection signals from the first touch electrode and the second touch electrode during a third time period after the second time period; and a controller configured to determine a touch position based on a signal output from the receiver, The frequency of the first driving signal is different from the frequency of the second driving signal, and the frequency of the second driving signal corresponds to the resonance frequency of the second touch object.

2. The touch device according to claim 1, wherein: The driver applies a pulse signal having a first frequency as the first driving signal.

3. The touch device according to claim 2, wherein: The receiver includes an amplifier connected to each of the second touch electrodes during the first period and configured to amplify and output a detection signal from the corresponding second touch electrode.

4. The touch device according to claim 2, wherein: The driver is configured to apply a pulse signal having a second frequency higher than the first frequency as the second driving signal.

5. The touch device according to claim 1, wherein: The receiver is configured to receive detection signals from both the first touch electrode and the second touch electrode during the third time period.

6. The touch device according to claim 1, wherein: The driver is configured not to apply the second driving signal to the first touch electrode and the second touch electrode during the third time period.

7. The touch device according to claim 1, wherein: The receiver includes a plurality of differential amplifiers configured to simultaneously receive detection signals from both the first touch electrode and the second touch electrode during the third time period.

8. The touch device according to claim 7, wherein: The driver is configured not to apply the second driving signal to the first touch electrode and the second touch electrode during the third time period.

9. The touch device according to claim 8, wherein: The controller is configured to determine whether the third detection signal is a valid touch signal based on whether a signal strength of the third detection signal exceeds a second threshold.

10. The touch device according to claim 7, wherein: The differential amplifier comprises: a first differential amplifier configured to receive detection signals from two first touch electrodes spaced apart by at least one first touch electrode; and A second differential amplifier is configured to receive detection signals from two second touch electrodes spaced apart by at least one second touch electrode.

11. The touch device according to claim 1, wherein: The detection signal includes at least one of a first detection signal generated by the first touch object and a second detection signal generated by the second touch object.

12. The touch device according to claim 11, wherein: The controller determines whether the detection signal is a valid touch signal based on whether a signal strength of the detection signal received in response to the first drive signal during the first time period exceeds a first threshold, and The first detection signal is determined as a valid touch signal, and the first threshold is set to filter out the second detection signal.

13. The touch device according to claim 1, wherein: The first touch object includes at least one of a finger and a palm, and The second touch object is a stylus including an RC resonant circuit.

14. A touch device, comprising: A touch panel comprising a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction intersecting the first direction; a driver configured to apply a first driving signal for detecting a first touch object to the first touch electrode during a first time period, and to apply a second driving signal for detecting a second touch object to the second touch electrode during a second time period after the first time period, the second touch object being different from the first touch object; a plurality of differential amplifiers configured to receive detection signals from the first touch electrode and the second touch electrode during a third time period after the second time period; and a controller configured to determine a touch position based on a signal output from the differential amplifier, The frequency of the first driving signal is different from the frequency of the second driving signal, and the frequency of the second driving signal corresponds to the resonance frequency of the second touch object.

15. The touch device according to claim 14, wherein: The differential amplifier is configured to simultaneously receive detection signals from both the first touch electrode and the second touch electrode during the third time period.

16. The touch device according to claim 14, wherein: The driver is configured not to apply the second driving signal to the first touch electrode and the second touch electrode during the third time period.

17. The touch device according to claim 14, wherein: The differential amplifier is configured to receive only a third detection signal generated by the second touch object in response to the second driving signal during the third time period.

18. The touch device according to claim 17, wherein: Whether the third detection signal is a valid touch signal is determined based on whether the signal strength of the third detection signal exceeds a second threshold.

19. The touch device according to claim 18, wherein: The differential amplifier comprises: a first differential amplifier configured to receive detection signals from two first touch electrodes spaced apart by at least one first touch electrode; and A second differential amplifier is configured to receive detection signals from two second touch electrodes spaced apart by at least one second touch electrode.

20. The touch device according to claim 14, wherein: The detection signal includes at least one of a first detection signal generated by the first touch object and a second detection signal generated by the second touch object.

21. The touch device according to claim 20, wherein: Each first differential amplifier of the plurality of differential amplifiers is connected to each second touch electrode during the first period and is configured to amplify and output a detection signal from the corresponding second touch electrode, and The controller is configured to determine whether the detection signal is a valid touch signal based on whether a signal strength of the detection signal received in response to the first drive signal during the first time period exceeds a first threshold, and The first threshold is set so that the first detection signal is determined as a valid touch signal, and the second detection signal is filtered out.

22. The touch device according to claim 14, wherein: The first touch object includes at least one of a finger and a palm, and The second touch object is a stylus including an RC resonant circuit.

23. The touch device according to claim 14, wherein: The frequency of the first driving signal is less than or equal to the frequency of the second driving signal.

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