Touch sensor device, display device and method of driving touch sensor

Abstract

The invention discloses a touch sensor device, a display device, and a method of driving a touch sensor. The touch sensor device includes a touch sensor and a transistor. The transistor is connected to the touch sensor. The transistor includes a first electrode configured to receive a first touch driving signal, a control electrode configured to receive a second touch driving signal, and a second electrode connected to the touch sensor. A phase of the first touch driving signal is substantially the same as a phase of the second touch driving signal.

Description

Technical Field

[0001] Embodiments of the inventive concept are directed to a touch sensor device, a display device including the touch sensor device, and a method of driving a touch sensor using the touch sensor device. More specifically, embodiments of the inventive concept are directed to a touch sensor device capable of reducing electromagnetic interference (EMI). Background Art

[0002] The display device may include a display panel and a panel driver for driving the display panel. The display panel displays an image based on input image data. The display panel includes a plurality of gate lines, a plurality of data lines and a plurality of pixels. The panel driver includes a gate driver, a data driver and a drive controller. The gate driver outputs a gate signal to the gate line. The data driver outputs a data voltage to the data line. The drive controller controls the gate driver and the data driver.

[0003] The display device may further include a touch sensor device. The touch sensor device may include a touch sensor and a touch driver for driving the touch sensor. For example, the touch driver may apply a touch drive signal to the touch sensor.

[0004] However, when the touch drive signal becomes distorted, the display quality of the display panel may be degraded, or electromagnetic interference (EMI) may be generated in adjacent electronic devices. Further, when the display device is used in a vehicle, EMI may affect vehicle operation and cause safety issues. Summary of the invention

[0005] At least one embodiment of the present inventive concept provides a touch sensor device capable of reducing electromagnetic interference (EMI) by generating a first touch drive signal applied to a first electrode of a transistor connected to a touch sensor and a second touch drive signal applied to a control electrode of the transistor so that the first touch drive signal and the second touch drive signal have the same phase.

[0006] At least one embodiment of the inventive concept provides a display device including the touch sensor device.

[0007] At least one embodiment of the inventive concept provides a method of driving a touch sensor using the touch sensor device.

[0008] In an embodiment of a touch sensor device according to the present invention, the touch sensor device includes a touch sensor and a transistor. The transistor is connected to the touch sensor. The transistor includes a first electrode configured to receive a first touch drive signal, a control electrode configured to receive a second touch drive signal, and a second electrode connected to the touch sensor. The phase of the first touch drive signal is substantially the same as the phase of the second touch drive signal.

[0009] In an embodiment, an average voltage of the first touch drive signal may be different from an average voltage of the second touch drive signal.

[0010] In an embodiment, the first touch drive signal may include a sine wave. The second touch drive signal may include a sine wave.

[0011] In an embodiment, the first touch drive signal may include a square wave. The second touch drive signal may include a square wave.

[0012] In an embodiment, when the transistor is a p-type transistor, an average voltage of the first touch drive signal may be greater than an average voltage of the second touch drive signal.

[0013] In an embodiment, when the transistor is an n-type transistor, an average voltage of the first touch driving signal may be less than an average voltage of the second touch driving signal.

[0014] In an embodiment, the touch sensor device may further include: a first digital-to-analog converter configured to generate a first touch drive signal; and a second digital-to-analog converter configured to generate a second touch drive signal.

[0015] In an embodiment, the first digital-to-analog converter may include: a first power supply voltage terminal configured to receive a first power supply voltage; a second power supply voltage terminal configured to receive a second power supply voltage; a plurality of first resistors connected between the first power supply voltage terminal and the second power supply voltage terminal; and a plurality of first switches connected to a node between the first power supply voltage terminal, the second power supply voltage terminal, and the first resistor. The second digital-to-analog converter may include: a third power supply voltage terminal configured to receive a third power supply voltage; a fourth power supply voltage terminal configured to receive a fourth power supply voltage; a plurality of second resistors connected between the third power supply voltage terminal and the fourth power supply voltage terminal; and a plurality of second switches connected to a node between the third power supply voltage terminal, the fourth power supply voltage terminal, and the second resistor.

[0016] In an embodiment, the first power supply voltage may be different from the third power supply voltage. The second power supply voltage may be different from the fourth power supply voltage.

[0017] In an embodiment, the touch sensor device may further include: a digital-to-analog converter configured to generate a first touch drive signal; and a level shifter configured to generate a second touch drive signal.

[0018] In an embodiment, the digital-to-analog converter may include: a first power supply voltage terminal configured to receive a first power supply voltage; a second power supply voltage terminal configured to receive a second power supply voltage; a plurality of first resistors connected between the first power supply voltage terminal and the second power supply voltage terminal; and a plurality of first switches connected to nodes between the first power supply voltage terminal, the second power supply voltage terminal and the first resistors.

[0019] In an embodiment, the level shifter may be configured to receive the first touch driving signal output from the digital-to-analog converter and shift a level of the first touch driving signal to generate the second touch driving signal.

[0020] In an embodiment, the touch sensor device may further include a touch driver. The touch driver may include: a driving circuit configured to apply the first touch driving signal and the second touch driving signal to the transistor; and a sensing circuit configured to receive a sensing voltage from the transistor.

[0021] In an embodiment, the sensing circuit may include: an amplifier including a first input terminal configured to receive a reference voltage, a second input terminal configured to receive a sensing voltage, and an output terminal; a sensing resistor connected between the second input terminal and the output terminal; a sensing switch connected between the second input terminal and the output terminal; and a sensing capacitor connected between the second input terminal and the output terminal.

[0022] In an embodiment, the touch sensor device may include: first to eighth touch sensors; and first to eighth transistors connected to corresponding one of the first to eighth touch sensors. The first group of drive signals may be configured to be applied to the control electrode of the first transistor and the control electrode of the fifth transistor. The second group of drive signals may be configured to be applied to the control electrode of the second transistor and the control electrode of the sixth transistor. The third group of drive signals may be configured to be applied to the control electrode of the third transistor and the control electrode of the seventh transistor. The fourth group of drive signals may be configured to be applied to the control electrode of the fourth transistor and the control electrode of the eighth transistor.

[0023] In an embodiment, during a first period, the first group of drive signals may have a valid waveform, and the second group of drive signals, the third group of drive signals, and the fourth group of drive signals may have an invalid level. During a second period, the second group of drive signals may have a valid waveform, and the first group of drive signals, the third group of drive signals, and the fourth group of drive signals may have an invalid level. During a third period, the third group of drive signals may have a valid waveform, and the first group of drive signals, the second group of drive signals, and the fourth group of drive signals may have an invalid level. During a fourth period, the fourth group of drive signals may have a valid waveform, and the first group of drive signals, the second group of drive signals, and the third group of drive signals may have an invalid level.

[0024] In an embodiment of a display device according to the present invention, the display device includes a display panel, a display panel driver, a touch sensor, and a transistor. The display panel includes pixels. The display panel driver is configured to drive the display panel. The transistor is connected to the touch sensor. The transistor includes a first electrode configured to receive a first touch drive signal, a control electrode configured to receive a second touch drive signal, and a second electrode connected to the touch sensor. The phase of the first touch drive signal is substantially the same as the phase of the second touch drive signal.

[0025] In an embodiment, a transistor connected to the touch sensor may be provided in a peripheral area of ​​the display panel.

[0026] In an embodiment, an average voltage of the first touch drive signal may be different from an average voltage of the second touch drive signal.

[0027] In an embodiment of a method for driving a touch sensor according to the inventive concept, the method includes: applying a first touch drive signal to a first electrode of a transistor including a second electrode connected to the touch sensor; applying a second touch drive signal to a control electrode of the transistor; and receiving a sensing voltage of the touch sensor through the transistor. The phase of the first touch drive signal is substantially the same as the phase of the second touch drive signal.

[0028] In an embodiment, an average voltage of the first touch drive signal may be different from an average voltage of the second touch drive signal.

[0029] According to a touch sensor device, a display device, and a method of driving a touch sensor, a first touch drive signal applied to a first electrode of a transistor connected to the touch sensor and a second touch drive signal applied to a control electrode of the transistor may be generated to have the same phase, so that EMI may be reduced.

[0030] Accordingly, the display quality of the display panel can be improved, and the influence of EMI on the touch sensor device and the electronic devices adjacent to the touch sensor device can be reduced. In particular, when the display device is used in a horizontally long display (such as a display for a vehicle), the safety of the vehicle can be improved by reducing EMI. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other features of the present inventive concept will become more apparent by describing in detail embodiments of the present inventive concept with reference to the accompanying drawings, in which:

[0032] Figure 1A is a block diagram illustrating a display device according to an embodiment of the inventive concept;

[0033] Figure 1B is a conceptual cross-sectional view illustrating a display panel of a display device according to an embodiment of the inventive concept;

[0034] Figure 1C is a conceptual cross-sectional view illustrating a display panel according to an embodiment of the inventive concept;

[0035] Figure 2 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 1A A block diagram of a display panel, a driving controller, a gate driver, a gamma reference voltage generator, a data driver and a multiplexer of a display device;

[0036] Figure 3 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 1A A conceptual diagram of a display device;

[0037] Figure 4 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 1A A circuit diagram of a touch sensor device;

[0038] Figure 5 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 4 A circuit diagram of a driving circuit;

[0039] Figure 6 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 4 A circuit diagram of a sensing circuit;

[0040] Figure 7 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 1A a circuit diagram of a portion of a touch sensor device;

[0041] Figure 8 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 7 A timing diagram of a touch drive signal;

[0042] Fig. 9 is a circuit diagram illustrating one touch sensor and one transistor of a touch sensor device according to a comparative example;

[0043] Fig.10 It is a graphic Fig. 9 The voltage of the first node of Fig. 9 The voltage of the second node and Fig. 9 A timing diagram of a voltage of a third node;

[0044] Fig.11 It is a graphic Fig.10 a graph showing a result of fast Fourier transform of a voltage at a third node;

[0045] Fig.12 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 4 A circuit diagram of a touch sensor and a transistor of a touch sensor device;

[0046] Fig.13 It is a graphic Fig.12 An example of a voltage of a first node of Fig.12 An example of a voltage of the second node and Fig.12 An example timing diagram of a voltage of a third node of FIG. 1 ;

[0047] Fig.14 It is a graphic Fig.12 An example of a voltage of a first node of Fig.12 An example of a voltage of the second node and Fig.12 An example timing diagram of a voltage of a third node of FIG. 1 ;

[0048] Fig.15 FIG. 2 is a diagram illustrating a first touch driving signal generator, a second touch driving signal generator, and a touch signal generator according to an embodiment of the inventive concept. Figure 4 A circuit diagram of a touch sensor and a transistor;

[0049] Fig.16 is a circuit diagram illustrating a first touch driving signal generator according to an embodiment of the inventive concept;

[0050] Fig.17 is a circuit diagram illustrating a second touch driving signal generator according to an embodiment of the inventive concept;

[0051] Fig.18 is a circuit diagram illustrating one touch sensor, one transistor, a first touch driving signal generator, and a second touch driving signal generator of a touch sensor device according to an embodiment of the inventive concept;

[0052] Fig.19is a circuit diagram illustrating a touch sensor and a transistor according to an embodiment of the inventive concept;

[0053] Fig. 20 It is a graphic Fig.19 An example of a voltage of a first node of Fig.19 An example of a voltage of the second node and Fig.19 An example timing diagram of a voltage of a third node of FIG. 1 ;

[0054] Fig.21 is a block diagram illustrating an electronic device according to an embodiment of the inventive concept; and

[0055] Fig. 22 It is a diagram of Fig.21 The electronic device is implemented as an example of a smart phone. DETAILED DESCRIPTION

[0056] Hereinafter, the inventive concept will be explained in detail with reference to the accompanying drawings.

[0057] Figure 1A is a block diagram illustrating a display device according to an embodiment of the inventive concept. Figure 1B is a conceptual cross-sectional view illustrating a display panel of a display device according to an embodiment of the inventive concept. Figure 1C is a conceptual cross-sectional view illustrating a display panel according to an embodiment of the inventive concept. Figure 2 FIG. 1 is a diagram illustrating an embodiment according to the present invention. Figure 1A A block diagram of a display panel, a driving controller, a gate driver, a gamma reference voltage generator, a data driver and a multiplexer of a display device of the present invention is provided.

[0058] refer to Figures 1A to 2 The display device includes a display panel 100 , a display panel driver driving the display panel 100 , a touch panel 600 disposed on the display panel 100 , and a touch driver 700 (eg, a driver circuit) driving the touch panel 600 .

[0059] The touch panel 600 includes at least one touch sensor DS. For example, the touch sensor DS may be a Self-Dot sensor. When a Self-Dot sensor is used as the touch sensor DS, the panel bandwidth may be wider and the effect of noise on the display panel 100 may be reduced. It may be useful to use a Self-Dot sensor in a display device having a long resolution in one direction in a vehicle because the Self-Dot sensor may be more easily arranged in the form of a line. However, when the touch sensor DS is implemented in the form of a line, signal delay may increase, the panel bandwidth may not be wide, and the effect of noise on the display panel 100 may increase.

[0060] exist Figure 1A In the embodiment, the touch panel 600 may be disposed outside the display panel 100. Alternatively, the touch panel 600 and the display panel 100 may be integrally formed. For example, when integrally formed, both the touch panel 600 and the display panel 100 may be implemented using a single layer.

[0061] refer to Figure 1B The display panel 100 may include a base substrate 110, a display layer 120 disposed on the base substrate 110, an encapsulation layer 130 disposed on the display layer 120, and a touch layer 140 disposed on the encapsulation layer 130. The display layer 120 may include a light emitting element. The touch layer 140 may include at least one touch sensor DS.

[0062] refer to Figure 1C The display panel 100 may include a base substrate 110, a display layer 120 disposed on the base substrate 110, a touch layer 140 disposed on the display layer 120, and an encapsulation layer 130 disposed on the touch layer 140. The display layer 120 may include a light emitting element. The touch layer 140 may include a touch sensor DS.

[0063] refer to Figure 1A , a plurality of touch sensors DS may be connected to the multiplexer MX. The multiplexer MX may select a specific touch sensor DS at a specific time so as to drive the touch sensor DS in a time division driving method. The multiplexer MX may include a plurality of transistors connected to the plurality of touch sensors DS.

[0064] For example, the multiplexer MX (see Figure 1A ) may be disposed in the peripheral area PA of the display panel 100 (see Figure 2 ). For example, the transistor of the multiplexer MX may be disposed in the peripheral area PA of the display panel 100. For example, the transistor may be integrated in the peripheral area PA of the display panel 100. When the transistor is integrated in the peripheral area PA of the display panel 100, the pad may be mounted more easily.

[0065] The touch driver 700 may apply a touch driving signal to the transistor. The touch driver 700 may receive a sensing voltage of the touch sensor DS through the transistor. The touch driver 700 may be referred to as a touch sensor device together with the transistors of the driving sensor DS and the multiplexer MX of the touch panel 600.

[0066] refer to Figure 2 , the display panel driver may include a driving controller 200 (eg, a controller circuit), a gate driver 300 (eg, a first driver circuit), a gamma reference voltage generator 400, and a data driver 500 (eg, a second driver circuit).

[0067] For example, the driving controller 200 and the data driver 500 may be integrally formed. For example, the driving controller 200, the gamma reference voltage generator 400 and the data driver 500 may be integrally formed. A driving module including at least the integrally formed driving controller 200 and the data driver 500 may be referred to as a timing controller embedded data driver (TED).

[0068] The display panel 100 has a display area AA on which an image is displayed and a peripheral area PA adjacent to the display area AA.

[0069] The display panel 100 includes a plurality of gate lines GL, a plurality of data lines DL, and a plurality of pixels P connected to the gate lines GL and the data lines DL. The gate lines GL may extend in a first direction D1, and the gate lines GL may be disposed to be spaced apart from each other in a second direction D2 crossing the first direction D1. The data lines DL may extend in the second direction D2, and the data lines DL may be disposed to be spaced apart from each other in the first direction D1.

[0070] The driving controller 200 receives input image data IMG and an input control signal CONT from an external device. The input image data IMG may include red image data, green image data, and blue image data. The input image data IMG may further include white image data. The input image data IMG may include magenta image data, yellow image data, and cyan image data. The input control signal CONT may include a main clock signal and a data enable signal. The input control signal CONT may further include a vertical synchronization signal and a horizontal synchronization signal.

[0071] The driving controller 200 generates a first control signal CONT1 , a second control signal CONT2 , a third control signal CONT3 , and a data signal DATA based on input image data IMG and an input control signal CONT.

[0072] The driving controller 200 generates a first control signal CONT1 for controlling the operation of the gate driver 300 based on the input control signal CONT, and outputs the first control signal CONT1 to the gate driver 300. The first control signal CONT1 may include a vertical start signal and a gate clock signal.

[0073] The driving controller 200 generates a second control signal CONT2 for controlling the operation of the data driver 500 based on the input control signal CONT, and outputs the second control signal CONT2 to the data driver 500. The second control signal CONT2 may include a horizontal start signal and a load signal.

[0074] The driving controller 200 generates a data signal DATA based on the input image data IMG. The driving controller 200 outputs the data signal DATA to the data driver 500.

[0075] The driving controller 200 generates a third control signal CONT3 for controlling the operation of the gamma reference voltage generator 400 based on the input control signal CONT, and outputs the third control signal CONT3 to the gamma reference voltage generator 400 .

[0076] The gate driver 300 generates a gate signal for driving the gate line GL in response to the first control signal CONT1 received from the driving controller 200. The gate driver 300 outputs the gate signal to the gate line GL. For example, the gate driver 300 may sequentially output the gate signal to the gate line GL. For example, the gate driver 300 may be installed in the peripheral area PA of the display panel 100. For example, the gate driver 300 may be integrated in the peripheral area PA of the display panel 100.

[0077] The gamma reference voltage generator 400 generates a gamma reference voltage VGREF in response to the third control signal CONT3 received from the driving controller 200. The gamma reference voltage generator 400 provides the gamma reference voltage VGREF to the data driver 500. The gamma reference voltage VGREF has a value corresponding to a level of the data signal DATA.

[0078] In an embodiment, the gamma reference voltage generator 400 may be provided in the driving controller 200 or in the data driver 500 .

[0079] The data driver 500 receives the second control signal CONT2 and the data signal DATA from the driving controller 200, and receives the gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 converts the data signal DATA into a data voltage of an analog type using the gamma reference voltage VGREF. The data driver 500 outputs the data voltage to the data line DL.

[0080] Figure 3 is a diagram illustrating Figure 1A Conceptual diagram of a display device.

[0081] refer to Figures 1A to 3 , a first group of touch sensors DS in the touch panel 600 may be connected to the first multiplexer MX1, and a second group of touch sensors DS in the touch panel 600 may be connected to the second multiplexer MX2. For example, the first group of touch sensors DS may include one or more columns of first touch sensors, and the second group of touch sensors DS may include one or more columns of second touch sensors.

[0082] The driving controller 200 and the touch driver 700 may be disposed on a printed circuit board PCB.

[0083] The touch driver 700 may be connected to the first multiplexer MX1 ​​and the second multiplexer MX2, output a touch driving signal to the touch sensor DS, and receive a sensing voltage from the touch sensor DS. Figure 3 The middle touch driver 700 includes two multiplexers MX1 and MX2 , but the inventive concept is not limited to this number of multiplexers.

[0084] like Figure 3 As shown in , the data driver 500 may be formed in the form of a chip on film. For example, the first chip on film unit COF1 may output a data voltage to a first area of ​​the display panel 100, the second chip on film unit COF2 may output a data voltage to a second area of ​​the display panel 100, the third chip on film unit COF3 may output a data voltage to a third area of ​​the display panel 100, and the fourth chip on film unit COF4 may output a data voltage to a fourth area of ​​the display panel 100. Although four chip on film units are illustrated, the inventive concept is not limited to this number of chip on film units.

[0085] Figure 4 It is a graphic Figure 1A A circuit diagram of a touch sensor device. Figure 5 It is a graphic Figure 4 710 is a circuit diagram of a driving circuit. Figure 6 It is a graphic Figure 4 720 is a circuit diagram of the sensing circuit 720.

[0086] refer to Figures 1A to 6 The touch panel 600 may include a plurality of touch sensors DS1, DS2, DS3, ..., DSN (see Figure 4 ), where N is a natural number greater than 0.

[0087] The multiplexer MX may include a plurality of transistors TR1 , TR2 , TR3 , . . . , TRN.

[0088] For example, the first touch sensor DS1 may be connected to the first transistor TR1, the second touch sensor DS2 may be connected to the second transistor TR2, the third touch sensor DS3 may be connected to the third transistor TR3, and the Nth touch sensor DSN may be connected to the Nth transistor TRN.

[0089] The touch driver 700 may be connected to the transistors TR1 , TR2 , TR3 , . . . , TRN The touch driver 700 may include a driving circuit 710 and a sensing circuit 720 .

[0090] For example, the driving circuit 710 may output a first touch driving signal (e.g., VS) to first electrodes of transistors TR1, TR2, TR3, ..., TRN. For example, the driving circuit 710 may output a second touch driving signal (e.g., VG1, VG2, VG3, ..., VGN) to control electrodes (or gate electrodes) of transistors TR1, TR2, TR3, ..., TRN.

[0091] For example, the driving circuit 710 may include a digital-to-analog converter. Figure 5 As shown in , the digital-to-analog converter may include a high power supply voltage terminal receiving a high level power supply voltage VH and a low power supply voltage terminal receiving a low level power supply voltage VL, and a resistor string R1, R2, R3, ..., RM-1 and RM arranged between the high power supply voltage terminal and the low power supply voltage terminal, wherein M is a natural number greater than 0. The digital-to-analog converter may include a switch SW1 connected to the high power supply voltage terminal, a switch SWM+1 connected to the low power supply voltage terminal, and a plurality of switches SW2, SW3, ..., SWM connected between the resistors of the resistor string R1, R2, R3, ..., RM-1 and RM. When the switches SW1, SW2, SW3, ..., SWM+1 are sequentially turned on, the digital-to-analog converter may output a touch drive signal (e.g., VS and VG1, VG2, VG3, ..., VGN) that periodically changes between a high level power supply voltage and a low level power supply voltage.

[0092] like Figure 6 As shown in , the sensing circuit 720 may include an amplifier AS, a sensing resistor RS, a sensing switch SWS, and a sensing capacitor CS. The amplifier AS may include a first input terminal receiving a reference voltage VREF, a second input terminal receiving a sensing voltage VSEN, and an output terminal. The sensing resistor RS may be connected between the second input terminal and the output terminal. The sensing switch SWS may be connected between the second input terminal and the output terminal. The sensing capacitor CS may be connected between the second input terminal and the output terminal.

[0093] The sensing resistor RS, the sensing switch SWS, and the sensing capacitor CS may be connected to each other in parallel.

[0094] The sensing circuit 720 may receive the sensing voltages VSEN of the touch sensors DS1 to DSN through the multiplexer MX.

[0095] Figure 7 is a diagram illustrating Figure 1A A circuit diagram of a portion of a touch sensor device. Figure 8 It is a graphic Figure 7 1 is a timing diagram of the second touch drive signals VG1, VG2, VG3 and VG4.

[0096] For ease of explanation, Figure 7 Eight touch sensors DS1 to DS8 are shown. Figure 7 , the same second touch drive signal VG1 is applied to transistors corresponding to and connected to the first touch sensor DS1 and the fifth touch sensor DS5, respectively, the same second touch drive signal VG2 is applied to transistors corresponding to and connected to the second touch sensor DS2 and the sixth touch sensor DS6, respectively, the same second touch drive signal VG3 is applied to transistors corresponding to and connected to the third touch sensor DS3 and the seventh touch sensor DS7, respectively, and the same second touch drive signal VG4 is applied to transistors corresponding to and connected to the fourth touch sensor DS4 and the eighth touch sensor DS8, respectively.

[0097] In this manner, the touch sensors DS1 to DS8 may be driven in a time-division driving method using the transistors TR1 to TR8 of the multiplexer MX.

[0098] like Figure 7 As shown in , the touch sensor device may include first to eighth touch sensors DS1 to DS8 and first to eighth transistors TR1 to TR8 corresponding to and connected to the first to eighth touch sensors DS1 to DS8, respectively. A first group of second touch drive signals (hereinafter referred to as the first group of drive signals) VG1 may be applied to the control electrode of the first transistor TR1 and the control electrode of the fifth transistor TR5. A second group of second touch drive signals (hereinafter referred to as the second group of drive signals) VG2 may be applied to the control electrode of the second transistor TR2 and the control electrode of the sixth transistor TR6. A third group of second touch drive signals (hereinafter referred to as the third group of drive signals) VG3 may be applied to the control electrode of the third transistor TR3 and the control electrode of the seventh transistor TR7. A fourth group of second touch drive signals (hereinafter referred to as the fourth group of drive signals) VG4 may be applied to the control electrode of the fourth transistor TR4 and the control electrode of the eighth transistor TR8.

[0099] like Figure 8 As shown in , during the first period DR1, the first group of drive signals VG1 has a valid waveform, and the second group of drive signals VG2, the third group of drive signals VG3, and the fourth group of drive signals VG4 have an invalid level. For example, the effective waveform of the first group of drive signals VG1 may have periodicity or may be a periodic signal. For example, the effective waveform of the first group of drive signals VG1 may be a sine wave, but is not limited thereto.

[0100] exist Figure 7, the first to eighth transistors TR1 to TR8 are p-type transistors, so that the inactive levels of the second group drive signal VG2, the third group drive signal VG3, and the fourth group drive signal VG4 can be high levels. The effective waveform of the first group drive signal VG1 can have a voltage lower than the voltage of the inactive level of the second group drive signal VG2, the third group drive signal VG3, and the fourth group drive signal VG4.

[0101] Although for ease of explanation, Figure 8 In the embodiment, the first group driving signal VG1 has a waveform of four cycles during the first period DR1, but the inventive concept is not limited thereto. For example, during the first period DR1, the first group driving signal VG1 may have a waveform of five or more cycles.

[0102] like Figure 8 As shown in, during the second period DR2, the second group drive signal VG2 has an effective waveform, and the first group drive signal VG1, the third group drive signal VG3 and the fourth group drive signal VG4 have an invalid level (e.g., a constant level). The second period DR2 may be after the first period DR1. For example, the effective waveform of the second group drive signal VG2 may have periodicity or may be a periodic signal. For example, the effective waveform of the second group drive signal VG2 may be a sine wave, but is not limited thereto.

[0103] like Figure 8 As shown in, during the third period DR3, the third group drive signal VG3 has a valid waveform, and the first group drive signal VG1, the second group drive signal VG2 and the fourth group drive signal VG4 have an invalid level. The third period DR3 may be after the second period DR2. For example, the effective waveform of the third group drive signal VG3 may have periodicity or may be a periodic signal. For example, the effective waveform of the third group drive signal VG3 may be a sine wave, but is not limited thereto.

[0104] like Figure 8 As shown in , during the fourth period DR4, the fourth group drive signal VG4 has a valid waveform, and the first group drive signal VG1, the second group drive signal VG2 and the third group drive signal VG3 have an invalid level. The fourth period DR4 may be after the third period DR3. For example, the effective waveform of the fourth group drive signal VG4 may have periodicity or may be a periodic signal. For example, the effective waveform of the fourth group drive signal VG4 may be a sine wave, but is not limited thereto.

[0105] Figure 7 The connection relationship between the touch sensor and the transistor shown in Figure 8 The timing and waveform of the touch driving signal shown in FIG. 1 are examples, and the present invention is not limited to Figure 7The connection relationship between the touch sensor and the transistor shown in Figure 8 The timing and waveform of the touch drive signal shown in FIG.

[0106] Fig. 9 is a circuit diagram illustrating one touch sensor DS and one transistor TR of a touch sensor device according to a comparative example. Fig.10 It is a graphic Fig. 9 The voltage VG of the first node Fig. 9 The voltage VS of the second node and Fig. 9 A timing diagram of the voltage VD of the third node. Fig.11 It is a graphic Fig.10 1 is a graph showing a result of fast Fourier transform of the voltage VD of the third node.

[0107] refer to Figures 9 to 11 , the first node may be the control electrode of the transistor TR, and the voltage VG of the first node may be the gate voltage of the transistor TR, that is, the second touch drive signal applied to the control electrode of the transistor TR, which uses the same reference numeral "VG" as the voltage of the first node hereinafter. The second node may be the first electrode of the transistor TR, and the voltage VS of the second node may be the source voltage of the transistor TR, that is, the first touch drive signal applied to the first electrode of the transistor TR, which uses the same reference numeral "VS" as the voltage of the second node hereinafter. The third node may be the second electrode of the transistor TR, and the voltage VD of the third node may be the drain voltage (that is, the output voltage) of the transistor TR.

[0108] like Fig.10 As shown in , the first touch driving signal VS applied to the first electrode of the transistor TR may have periodicity. The first touch driving signal VS may be a sine wave.

[0109] In contrast, the second touch driving signal VG applied to the control electrode of the transistor TR is a direct current (DC) voltage.

[0110] In this driving method, the waveform of the gate-source voltage Vgs of the transistor TR continuously changes along the time axis, and the on-resistance of the transistor TR also continuously changes according to the change of the gate-source voltage Vgs.

[0111] Accordingly, if Fig.10 As shown in , the voltage VS of the second node may be an undistorted sine wave, and the voltage VD of the third node may be a sine wave with a distorted bottom (shown in dotted line).

[0112] exist Fig.11 The diagram shows Fig.10 The voltage VD of the third node is the result of fast Fourier transform. Fig.11As shown in the dotted line portion of , the voltage VD of the third node may have a harmonic component. The harmonic component may generate undesirable electromagnetic interference (EMI).

[0113] Fig.12 It is a graphic Figure 4 A circuit diagram of a touch sensor device including a touch sensor DS and a transistor TR. Fig.13 It is a graphic Fig.12 An example of a voltage VG of the first node of Fig.12 An example of a voltage VS of the second node and Fig.12 1 is a timing diagram of an example of a voltage VD of the third node.

[0114] refer to Fig.12 and Fig.13 , the first node may be a control electrode of the transistor TR, and the voltage VG of the first node may be a gate voltage of the transistor TR. The second node may be a first electrode of the transistor TR, and the voltage VS of the second node may be a source voltage of the transistor TR. The third node may be a second electrode of the transistor TR, and the voltage VD of the third node may be a drain voltage of the transistor TR.

[0115] In the present embodiment, a phase of the first touch driving signal VS applied to the first electrode of the transistor TR is the same as or substantially the same as a phase of the second touch driving signal VG applied to the control electrode of the transistor TR.

[0116] An average voltage of the first touch driving signal VS may be different from an average voltage of the second touch driving signal VG.

[0117] In an embodiment, the amplitude of the first touch driving signal VS is the same or substantially the same as the amplitude of the second touch driving signal VG.

[0118] In this embodiment, the transistor TR is a p-type transistor, so that the average voltage of the first touch drive signal VS can be greater than the average voltage of the second touch drive signal VG. In an embodiment, the average voltage of the first touch drive signal VS is greater than the average voltage of the second touch drive signal VG, so that the transistor TR can be turned on.

[0119] For example, the first touch drive signal VS may periodically swing between -5 V and 5 V relative to 0 V. Conversely, the second touch drive signal VG may periodically swing between -15 V and -5 V relative to -10 V. Herein, the average voltage of the first touch drive signal VS may be 0 V, and the average voltage of the second touch drive signal VG may be -10 V, but the embodiment is not limited thereto.

[0120] like Fig.13As shown in , the first touch drive signal VS may have periodicity or may be a periodic signal. The second touch drive signal VG may have periodicity or may be a periodic signal. For example, the first touch drive signal VS may be a sine wave. For example, the second touch drive signal VG may be a sine wave.

[0121] exist Fig.13 , the average voltage of the second touch drive signal VG is V1, and the average voltage of the first touch drive signal VS is V2. The average voltage of the output voltage VD of the transistor TR is V3.

[0122] The method of driving the touch sensor DS of this embodiment includes applying a first touch drive signal VS to a first electrode of a transistor TR including a second electrode connected to the touch sensor DS; applying a second touch drive signal VG to a control electrode of the transistor TR; and receiving a sensing voltage VSEN of the touch sensor DS through the transistor TR.

[0123] In the driving method of this embodiment, the sine wave applied to the touch sensor DS may not be distorted. In this embodiment, the phase of the first touch drive signal VS applied to the source electrode of the transistor TR is the same or substantially the same as the phase of the second touch drive signal VG applied to the gate electrode of the transistor TR.

[0124] Accordingly, the waveform of the gate-source voltage Vgs of the transistor TR can be uniformly maintained, and thus the on-resistance of the transistor TR can be uniformly maintained. Therefore, the sine wave may not be distorted, so that the harmonic frequency signal which is a characteristic of the sine wave can be reduced or removed.

[0125] Fig.14 It is a graphic Fig.12 An example of a voltage VG of the first node of Fig.12 An example of a voltage VS of the second node and Fig.12 1 is a timing diagram of an example of a voltage VD of the third node.

[0126] refer to Fig.12 and Fig.14 In this embodiment, the phase of the first touch driving signal VS applied to the first electrode of the transistor TR is the same as or substantially the same as the phase of the second touch driving signal VG applied to the control electrode of the transistor TR.

[0127] In an embodiment, an average voltage of the first touch driving signal VS is different from an average voltage of the second touch driving signal VG.

[0128] In an embodiment, the amplitude of the first touch driving signal VS is the same or substantially the same as the amplitude of the second touch driving signal VG.

[0129] In this embodiment, the transistor TR is a p-type transistor, so that the average voltage of the first touch drive signal VS can be greater than the average voltage of the second touch drive signal VG. In an embodiment, the average voltage of the first touch drive signal VS is greater than the average voltage of the second touch drive signal VG, so that the transistor TR can be turned on.

[0130] like Fig.14 As shown in , the first touch drive signal VS may have periodicity or may be a periodic signal. The second touch drive signal VG may have periodicity or may be a periodic signal. For example, the first touch drive signal VS may be a square wave. For example, the second touch drive signal VG may be a square wave.

[0131] exist Fig.14 In the embodiment, the average voltage of the first touch driving signal VS may be V2, and the average voltage of the second touch driving signal VG may be V1. The average voltage of the output voltage VD of the transistor TR may be V3.

[0132] Fig.15 The first touch driving signal generator DAC1, the second touch driving signal generator DAC2 and Figure 4 A circuit diagram of a touch sensor DS and a transistor TR. Fig.16 is a circuit diagram illustrating a first touch driving signal generator DAC1 according to an embodiment. Fig.17 is a circuit diagram illustrating a second touch driving signal generator DAC2 according to an embodiment.

[0133] refer to Figures 1A to 8 as well as Figures 12 to 17 The touch sensor device may further include a first touch driving signal generator DAC1 generating a first touch driving signal VS and a second touch driving signal generator DAC2 generating a second touch driving signal VG.

[0134] In the present embodiment, the first touch driving signal generator DAC1 may be a first digital-to-analog converter, and the second touch driving signal generator DAC2 may be a second digital-to-analog converter.

[0135] like Fig.16 As shown in, the first digital-to-analog converter may include a first power supply voltage terminal receiving a first power supply voltage VH1, a second power supply voltage terminal receiving a second power supply voltage VL1, a plurality of first converter resistors (or first resistors) R11 to RX connected between the first power supply voltage terminal and the second power supply voltage terminal, and a plurality of first converter switches (or first switches) SW11 to SWX+1 connected to nodes between the first power supply voltage terminal, the second power supply voltage terminal and the first converter resistors R11 to RX.

[0136] like Fig.17 As shown in, the second digital-to-analog converter may include a third power supply voltage terminal receiving a third power supply voltage VH2, a fourth power supply voltage terminal receiving a fourth power supply voltage VL2, a plurality of second converter resistors (or second resistors) R21 to RY connected between the third power supply voltage terminal and the fourth power supply voltage terminal, and a plurality of second converter switches (or second switches) SW21 to SWY+1 connected to nodes between the third power supply voltage terminal, the fourth power supply voltage terminal and the second converter resistors R21 to RY.

[0137] In an embodiment of the inventive concept, the first power voltage VH1 is different from the third power voltage VH2 , and the second power voltage VL1 is different from the fourth power voltage VL2 .

[0138] In the present embodiment, the transistor TR is a p-type transistor, so that the third power supply voltage VH2 may be lower than the first power supply voltage VH1 , and the fourth power supply voltage VL2 may be lower than the second power supply voltage VL1 .

[0139] For example, when the first touch drive signal VS periodically swings between -5V and 5V relative to 0V and the second touch drive signal VG periodically swings between -15V and -5V relative to -10V, the first power supply voltage VH1 may be 5V, the second power supply voltage VL1 may be -5V, the third power supply voltage VH2 may be -5V, and the fourth power supply voltage VL2 may be -15V.

[0140] According to the present embodiment, the first touch driving signal VS applied to the first electrode of the transistor TR connected to the touch sensor DS and the second touch driving signal VG applied to the control electrode of the transistor TR are generated to have the same phase, so that EMI can be reduced.

[0141] Accordingly, the display quality of the display panel 100 can be improved, and the influence of EMI on the touch sensor device and the electronic devices adjacent to the touch sensor device can be reduced. In particular, when the display device is used in a horizontally long display (such as a display for a vehicle), the safety of the vehicle can be improved by reducing EMI.

[0142] Fig.18 is a circuit diagram illustrating one touch sensor DS, one transistor TR, a first touch driving signal generator DAC, and a second touch driving signal generator LS of a touch sensor device according to an embodiment of the inventive concept.

[0143] Except for the structure and operation of the second touch drive signal generator, the touch sensor device and the display device according to the present embodiment are different from those of the reference Figures 1A to 8 as well as Figures 12 to 17 The touch sensor device and display device of the previous embodiment explained are substantially the same. Therefore, the same reference numerals will be used to refer to the same Figures 1A to 8 as well as Figures 12 to 17 The same or similar parts as those described in the previous embodiments are described herein, and any repeated explanation regarding the above elements will be omitted.

[0144] refer to Figures 1A to 8 , Figure 12 to Figure 14 , Fig.16 and Fig.18 The display device includes a display panel 100 , a display panel driver for driving the display panel 100 , a touch panel 600 disposed on the display panel 100 , and a touch driver 700 for driving the touch panel 600 .

[0145] The touch panel 600 includes a touch sensor DS. For example, the touch sensor DS may be a Self-Dot sensor.

[0146] A plurality of touch sensors DS may be connected to the multiplexer MX. The multiplexer MX may select a specific touch sensor DS at a specific time to drive the touch sensor DS in a time division driving method. The multiplexer MX may include a plurality of transistors TR connected to the plurality of touch sensors DS.

[0147] For example, the multiplexer MX may be disposed in the peripheral area PA of the display panel 100. For example, the transistor TR of the multiplexer MX may be disposed in the peripheral area PA of the display panel 100. For example, the transistor TR may be integrated in the peripheral area PA of the display panel 100.

[0148] The touch driver 700 may apply a touch driving signal to the transistor TR. The touch driver 700 may receive a sensing voltage VSEN of the touch sensor DS through the transistor TR.

[0149] In the present embodiment, a phase of the first touch driving signal VS applied to the first electrode of the transistor TR is the same as or substantially the same as a phase of the second touch driving signal VG applied to the control electrode of the transistor TR.

[0150] In an embodiment, an average voltage of the first touch driving signal VS is different from an average voltage of the second touch driving signal VG.

[0151] In an embodiment, the amplitude of the first touch driving signal VS is the same or substantially the same as the amplitude of the second touch driving signal VG.

[0152] In this embodiment, the transistor TR is a p-type transistor, so that the average voltage of the first touch drive signal VS can be greater than the average voltage of the second touch drive signal VG. In an embodiment, the average voltage of the first touch drive signal VS is greater than the average voltage of the second touch drive signal VG, so that the transistor TR can be turned on.

[0153] The touch sensor device may further include a first touch driving signal generator DAC generating the first touch driving signal VS and a second touch driving signal generator LS generating the second touch driving signal VG.

[0154] In the present embodiment, the first touch driving signal generator DAC is a first digital-to-analog converter, and the second touch driving signal generator LS is a level shifter (eg, a level shifter circuit).

[0155] like Fig.16 As shown in, the first digital-to-analog converter may include a first power supply voltage terminal receiving a first power supply voltage VH1, a second power supply voltage terminal receiving a second power supply voltage VL1, a plurality of first converter resistors R11 to RX connected between the first power supply voltage terminal and the second power supply voltage terminal, and a plurality of first converter switches SW11 to SWX+1 connected to the first power supply voltage terminal, the second power supply voltage terminal and nodes between the first converter resistors R11 to RX.

[0156] In an embodiment, the level shifter receives the first touch drive signal VS output from the first digital-to-analog converter, and shifts the level of the first touch drive signal VS to generate the second touch drive signal VG. The level shifter does not change the phase of the first touch drive signal VS, but changes the level of the first touch drive signal VS to generate the second touch drive signal VG. Therefore, the first touch drive signal VS and the second touch drive signal VG may have the same phase.

[0157] According to the present embodiment, the first touch driving signal VS applied to the first electrode of the transistor TR connected to the touch sensor DS and the second touch driving signal VG applied to the control electrode of the transistor TR are generated to have the same phase, so that EMI can be reduced.

[0158] Accordingly, the display quality of the display panel 100 can be improved, and the influence of EMI on the touch sensor device and the electronic devices adjacent to the touch sensor device can be reduced. In particular, when the display device is used in a horizontally long display (such as a display for a vehicle), the safety of the vehicle can be improved by reducing EMI.

[0159] Fig.19is a circuit diagram illustrating one touch sensor and one transistor according to an embodiment of the inventive concept. Fig. 20 It is a graphic Fig.19 An example of a voltage of a first node of Fig.19 An example of a voltage of the second node and Fig.19 is an example timing diagram of the voltage of the third node.

[0160] The touch sensor device and the display device according to the present embodiment are different from those of the reference 1 except that the transistors of the multiplexer are n-type transistors. Figures 1A to 8 as well as Figures 12 to 17 The touch sensor device and display device of the previous embodiment explained are substantially the same. Therefore, the same reference numerals will be used to refer to the same Figures 1A to 8 as well as Figures 12 to 17 The same or similar parts as those described in the previous embodiments are described herein, and any repeated explanation regarding the above elements will be omitted.

[0161] refer to Figures 1A to 8 as well as Figure 19 to Figure 20 The display device includes a display panel 100 , a display panel driver for driving the display panel 100 , a touch panel 600 disposed on the display panel 100 , and a touch driver 700 for driving the touch panel 600 .

[0162] The touch panel 600 includes a touch sensor DS. For example, the touch sensor DS may be a Self-Dot sensor.

[0163] A plurality of touch sensors DS may be connected to the multiplexer MX. The multiplexer MX may select a specific touch sensor DS at a specific time to drive the touch sensor DS in a time division driving method. The multiplexer MX may include a plurality of transistors TR connected to the plurality of touch sensors DS.

[0164] For example, the multiplexer MX may be disposed in the peripheral area PA of the display panel 100. For example, the transistor TR of the multiplexer MX may be disposed in the peripheral area PA of the display panel 100. For example, the transistor TR may be integrated in the peripheral area PA of the display panel 100.

[0165] The touch driver 700 may apply a touch driving signal to the transistor TR. The touch driver 700 may receive a sensing voltage VSEN of the touch sensor DS through the transistor TR.

[0166] In the present embodiment, a phase of the first touch driving signal VS applied to the first electrode of the transistor TR is the same as or substantially the same as a phase of the second touch driving signal VG applied to the control electrode of the transistor TR.

[0167] In an embodiment, an average voltage of the first touch driving signal VS is different from an average voltage of the second touch driving signal VG.

[0168] In an embodiment, the amplitude of the first touch drive signal VS may be substantially the same as the amplitude of the second touch drive signal VG.

[0169] In the present embodiment, the transistor TR is an n-type transistor, so that the average voltage of the first touch drive signal VS can be less than the average voltage of the second touch drive signal VG. In an embodiment, the average voltage of the first touch drive signal VS is less than the average voltage of the second touch drive signal VG, so that the transistor TR can be turned on.

[0170] like Fig. 20 As shown in , the first touch drive signal VS may have periodicity or may be a periodic signal. The second touch drive signal VG may have periodicity or may be a periodic signal. For example, the first touch drive signal VS may be a sine wave. For example, the second touch drive signal VG may be a sine wave.

[0171] exist Fig. 20 In the embodiment, the average voltage of the second touch driving signal VG may be V1, and the average voltage of the first touch driving signal VS may be V2. The average voltage of the output voltage VD of the transistor TR may be V3.

[0172] Alternatively, if Fig.14 As shown in , the first touch driving signal VS may be a square wave, and the second touch driving signal VG may be a square wave.

[0173] like Fig.15 As shown in , the touch sensor device of the present embodiment may include a first touch driving signal generator DAC1 which is a first digital-to-analog converter and a second touch driving signal generator DAC2 which is a second digital-to-analog converter.

[0174] Alternatively, if Fig.18 As shown in , the touch sensor device of the present embodiment may include a first touch driving signal generator DAC which is a first digital-to-analog converter and a second touch driving signal generator LS which is a level shifter.

[0175] According to the present embodiment, the first touch driving signal VS applied to the first electrode of the transistor TR connected to the touch sensor DS and the second touch driving signal VG applied to the control electrode of the transistor TR may be generated to have the same phase, so that EMI may be reduced.

[0176] Accordingly, the display quality of the display panel 100 can be improved, and the influence of EMI on the touch sensor device and the electronic devices adjacent to the touch sensor device can be reduced. In particular, when the display device is used in a horizontally long display (such as a display for a vehicle), the safety of the vehicle can be improved by reducing EMI.

[0177] Fig.21 is a block diagram illustrating an electronic device according to an embodiment of the inventive concept. Fig. 22 It is a diagram of Fig.21 The electronic device is implemented as an example of a smart phone.

[0178] refer to Fig.21 and Fig. 22 , the electronic device 1000 may include a processor 1010, a memory device 1020, a storage device 1030, an input / output (I / O) device 1040, a power supply 1050, and a display device 1060. Here, the display device 1060 may be Figure 1A In addition, the electronic device 1000 may further include a plurality of ports for communicating with a video card, a sound card, a memory card, a universal serial bus (USB) device, or other electronic devices.

[0179] In an embodiment, Fig. 22 As illustrated in , the electronic device 1000 may be implemented as a smart phone. However, the electronic device 1000 is not limited thereto. For example, the electronic device 1000 may be implemented as a cellular phone, a video phone, a smart tablet, a smart watch, a tablet PC, a car navigation system, a computer monitor, a laptop computer, and a head mounted display (HMD) device, etc.

[0180] The processor 1010 may perform various computing functions or various tasks. The processor 1010 may be a microprocessor, a central processing unit (CPU), an application processor (AP), etc. The processor 1010 may be coupled to other components via an address bus, a control bus, and a data bus, etc. Further, the processor 1010 may be coupled to an expansion bus such as a peripheral component interconnect (PCI) bus.

[0181] The processor 1010 can process the input image data IMG (see Figure 2 ) and the input control signal CONT (see Figure 2 ) output to Figure 2 A drive controller 200 is provided.

[0182] The memory device 1020 may store data used for the operation of the electronic device 1000. For example, the memory device 1020 may include at least one nonvolatile memory device (such as an erasable programmable read-only memory (EPROM) device, an electrically erasable programmable read-only memory (EEPROM) device, a flash memory device, a phase change random access memory (PRAM) device, a resistive random access memory (RRAM) device, a nano floating gate memory (NFGM) device, a polymer random access memory (PoRAM) device, a magnetic random access memory (MRAM) device, and a ferroelectric random access memory (FRAM) device, etc.) and / or at least one volatile memory device (such as a dynamic random access memory (DRAM) device, a static random access memory (SRAM) device, and a mobile DRAM device, etc.).

[0183] The storage device 1030 may include a solid state drive (SSD) device, a hard disk drive (HDD) device, a CD-ROM device, etc. The I / O device 1040 may include input devices such as a keyboard, a keypad, a mouse device, a touch pad, and a touch screen, etc., and output devices such as a printer and a speaker, etc. In some embodiments, a display device 1060 may be included in the I / O device 1040. The power supply 1050 may provide power for the operation of the electronic device 1000. The display device 1060 may be coupled to other components via a bus or other communication link.

[0184] Despite Fig. 22 The electronic device of the present invention is implemented as a smart phone, but the present invention is not limited thereto. Alternatively, the electronic device may be one of a television, a monitor, a laptop computer, or a tablet personal computer (PC). Alternatively, the electronic device may be a car.

[0185] According to an embodiment of a touch sensor device, a display device including the touch sensor device, and a method of driving a touch sensor using the touch sensor device, a first touch drive signal applied to a first electrode of a transistor connected to a touch sensor and a second touch drive signal applied to a control electrode of the transistor can be generated to have the same phase, so that EMI can be reduced. In particular, when the display device is used in a horizontally long display (such as a display for a vehicle), the safety of the vehicle can be improved by reducing EMI.

[0186] The foregoing is an illustration of the inventive concept and should not be construed as limiting thereof. Although several embodiments of the inventive concept have been described, it will be readily appreciated by those skilled in the art that many modifications may be made in the embodiments without substantially departing from the inventive concept. Accordingly, all such modifications are intended to be included within the scope of the inventive concept as defined in the claims.

Claims

1. A touch sensor device, comprising: Touch sensor; as well as transistor, connected to the touch sensor, Wherein, the transistor comprises: A first electrode configured to receive a first touch driving signal; a control electrode configured to receive a second touch drive signal; and a second electrode connected to the touch sensor, and The phase of the first touch driving signal is the same as the phase of the second touch driving signal.

2. The touch sensor device according to claim 1, wherein: An average voltage of the first touch driving signal is different from an average voltage of the second touch driving signal.

3. The touch sensor device according to claim 2, wherein: The first touch drive signal comprises a sine wave, and Wherein, the second touch driving signal includes a sine wave.

4. The touch sensor device according to claim 2, wherein: The first touch drive signal comprises a square wave, and Wherein, the second touch driving signal includes a square wave.

5. The touch sensor device according to claim 2, wherein: When the transistor is a p-type transistor, the average voltage of the first touch drive signal is greater than the average voltage of the second touch drive signal.

6. The touch sensor device according to claim 2, wherein: When the transistor is an n-type transistor, the average voltage of the first touch drive signal is less than the average voltage of the second touch drive signal.

7. The touch sensor device according to claim 1, further comprising: A first digital-to-analog converter, configured to generate the first touch drive signal; as well as The second digital-to-analog converter is configured to generate the second touch drive signal.

8. The touch sensor device according to claim 7, wherein: The first digital-to-analog converter comprises: a first power supply voltage terminal configured to receive a first power supply voltage; a second power supply voltage terminal configured to receive a second power supply voltage; a plurality of first resistors connected between the first power supply voltage terminal and the second power supply voltage terminal; and a plurality of first switches connected to a node between the first power supply voltage terminal, the second power supply voltage terminal and the first resistor, and Wherein, the second digital-to-analog converter comprises: a third power supply voltage terminal configured to receive a third power supply voltage; a fourth power supply voltage terminal configured to receive a fourth power supply voltage; a plurality of second resistors connected between the third power supply voltage terminal and the fourth power supply voltage terminal; and A plurality of second switches are connected to a node between the third power supply voltage terminal, the fourth power supply voltage terminal, and the second resistor.

9. The touch sensor device according to claim 8, wherein: The first power supply voltage is different from the third power supply voltage, and The second power supply voltage is different from the fourth power supply voltage.

10. The touch sensor device according to claim 1, further comprising: a digital-to-analog converter, configured to generate the first touch drive signal; as well as The level shifter is configured to generate the second touch driving signal.

11. The touch sensor device according to claim 10, wherein: The digital-to-analog converter comprises: a first power supply voltage terminal configured to receive a first power supply voltage; a second power supply voltage terminal configured to receive a second power supply voltage; a plurality of first resistors connected between the first power supply voltage terminal and the second power supply voltage terminal; and A plurality of first switches are connected to a node between the first power supply voltage terminal, the second power supply voltage terminal, and the first resistor.

12. The touch sensor device according to claim 10, wherein: The level shifter is configured to receive the first touch driving signal output from the digital-to-analog converter and shift a level of the first touch driving signal to generate the second touch driving signal.

13. The touch sensor device according to claim 1, further comprising a touch driver, in, The touch driver comprises: a driving circuit configured to apply the first touch driving signal and the second touch driving signal to the transistor; and The sensing circuit is configured to receive a sensing voltage from the transistor.

14. The touch sensor device according to claim 13, wherein: The sensing circuit comprises: an amplifier comprising a first input terminal configured to receive a reference voltage, a second input terminal configured to receive the sense voltage, and an output terminal; a sensing resistor connected between the second input terminal and the output terminal; a sensing switch connected between the second input terminal and the output terminal; and A sensing capacitor is connected between the second input terminal and the output terminal.

15. The touch sensor device according to any one of claims 1 to 14, wherein: The touch sensor device comprises: first to eighth touch sensors; and first to eighth transistors, each connected to a corresponding one of the first to eighth touch sensors, wherein the first set of driving signals is configured to be applied to the control electrode of the first transistor and the control electrode of the fifth transistor, wherein the second set of driving signals is configured to be applied to the control electrode of the second transistor and the control electrode of the sixth transistor, wherein the third set of driving signals is configured to be applied to the control electrode of the third transistor and the control electrode of the seventh transistor, and The fourth group of driving signals is configured to be applied to the control electrode of the fourth transistor and the control electrode of the eighth transistor.

16. The touch sensor device according to claim 15, wherein: During a first period, the first group of driving signals has a valid waveform, and the second group of driving signals, the third group of driving signals and the fourth group of driving signals have an invalid level, During the second period, the second group of driving signals has a valid waveform, and the first group of driving signals, the third group of driving signals and the fourth group of driving signals have an invalid level. wherein, during a third period, the third group of drive signals has a valid waveform, the first group of drive signals, the second group of drive signals and the fourth group of drive signals have an invalid level, and During a fourth period, the fourth group of driving signals has a valid waveform, and the first group of driving signals, the second group of driving signals and the third group of driving signals have an invalid level.

17. A display device, comprising: A display panel, including pixels; A display panel driver configured to drive the display panel; Touch sensor; as well as transistor, connected to the touch sensor, Wherein, the transistor comprises: A first electrode configured to receive a first touch driving signal; a control electrode configured to receive a second touch drive signal; and a second electrode connected to the touch sensor, and The phase of the first touch driving signal is the same as the phase of the second touch driving signal.

18. The display device according to claim 17, wherein: The transistor connected to the touch sensor is disposed in a peripheral area of ​​the display panel.

19. The display device according to claim 17 or 18, wherein: An average voltage of the first touch driving signal is different from an average voltage of the second touch driving signal.

20. A method for driving a touch sensor, the method comprising: applying a first touch drive signal to a first electrode of a transistor including a second electrode connected to the touch sensor; applying a second touch drive signal to the control electrode of the transistor; as well as receiving a sensing voltage of the touch sensor through the transistor, The phase of the first touch driving signal is the same as the phase of the second touch driving signal.

21. The method according to claim 20, wherein: An average voltage of the first touch driving signal is different from an average voltage of the second touch driving signal.

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