Touch display device and driving method thereof

Abstract

A touch display device includes: a touch panel, which is driven by a synchronization signal in time-division into a touch sensing period and a display period, and includes a plurality of touch electrodes; and a touch driver, which drives the touch panel. The touch driver includes: a touch sensing circuit, which is configured to provide a touch driving signal to each of the plurality of touch electrodes, and to sample an integral value of an analog touch sensing signal detected by each of the plurality of touch electrodes to output digital sensing data; a touch control circuit, which is configured to generate a pulse width modulation (PWM) signal including a plurality of pulses, and to receive sensing data to determine a touch; and a sampling control circuit, which is configured to output a sampling control signal to the touch sensing circuit, the sampling control signal controlling the sampling timing of the integral value of the touch sensing signal.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2020-0174182 filed in the Korean Intellectual Property Office on December 14, 2020, and Korean Patent Application No. 10-2021-0042313 filed in the Korean Intellectual Property Office on March 31, 2021, the disclosures of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a touch display device, and more particularly, to a touch display device configured to output a pulse width modulation (PWM) touch driving signal and a driving method thereof. Background Art

[0004] As the information society develops, the demand for display devices for displaying images in various forms has increased. Recently, various display devices such as liquid crystal display devices LCD, plasma display panels PDP, and organic light emitting display devices OLED are used.

[0005] Among these display devices, there is a touch display device that provides a touch-based input method to allow a user to easily, intuitively, and conveniently input information or commands by departing from a general input method such as a button, a keyboard, or a mouse.

[0006] In order to provide a touch-based input method, a touch display device is required to determine whether there is a user's touch and accurately detect touch coordinates (touch position).

[0007] To this end, a capacitive touch method is often used, which detects the presence of touch and touch coordinates based on capacitance changes between touch electrodes or between a touch electrode and a pointer (such as a finger) by providing multiple touch electrodes in a touch panel as touch sensors.

[0008] In addition, the touch display device can be driven in a time-division manner into a display period in which one frame is displayed and a touch sensing period in which a touch to the screen is sensed.

[0009] During the above touch sensing period, a pulse width modulation (PWM) touch driving signal is transmitted to the touch electrode, and analog touch sensing signal data is received from the touch electrode to be converted into a digital signal to determine the touch (analog-to-digital conversion).

[0010] However, there is a problem in that when the time period is switched to the display period during analog-to-digital conversion, jitter is generated in the converted digital sensing data due to source channel switching for display driving, so that touch performance is degraded. Summary of the invention

[0011] One object to be achieved by the present disclosure is to provide a touch display device and a driving method thereof that suppress jitter generated in digital sensing data.

[0012] Another object to be achieved by the present disclosure is to provide a touch display device with improved touch sensing performance and a driving method thereof.

[0013] The objects of the present disclosure are not limited to the above objects, and other objects not mentioned above can be clearly understood by those skilled in the art from the following description.

[0014] According to one aspect of the present disclosure, a touch display device includes: a touch panel, which is driven by a synchronization signal in time-division into a touch sensing period and a display period, and includes a plurality of touch electrodes; and a touch driver, which drives the touch panel. The touch driver includes: a touch sensing circuit, which is configured to provide a touch driving signal to each of the plurality of touch electrodes, and to sample the integral value of the analog touch sensing signal detected by each of the plurality of touch electrodes to output digital sensing data; a touch control circuit, which is configured to generate a pulse width modulation (PWM) signal including a plurality of pulses, and receive sensing data to determine touch; and a sampling control circuit, which is configured to output a sampling control signal to the touch sensing circuit, the sampling control signal controlling the sampling timing of the integral value of the touch sensing signal. Therefore, jitter is not generated in the sensing data, thereby improving touch performance.

[0015] According to another aspect of the present disclosure, a method for driving a touch display device includes: a PWM generating step of generating a pulse width modulated PWM signal including a plurality of pulses; a touch drive signal outputting step of outputting the PWM signal as a touch drive signal to each of the plurality of touch electrodes; a touch sensing signal inputting step of receiving an analog touch sensing signal detected by each of the plurality of touch electrodes; a signal comparing step of determining whether an ADC valid signal and a synchronization signal overlap to output an overlap signal; a sampling control step of advancing a sampling timing of an integral value of a touch sensing signal and holding the integral value; an analog-to-digital conversion step of receiving the integral value of the analog touch sensing signal to convert the integral value into digital sensing data; and a sensing data transmitting step of transmitting the digital sensing data to determine touch information about the presence of a touch and a touch position based on the sensing data, and the ADC valid signal is at a second level only when an analog-to-digital converter ADC included in the touch driver operates and a synchronization signal is at a first level in a touch sensing period and at a second level in a display period, thereby improving touch performance.

[0016] Additional details of exemplary embodiments are included in the detailed description and the accompanying drawings.

[0017] According to the present disclosure, the operation of the analog-to-digital converter is completed within the touch sensing period so that jitter is not generated in the converted digital sensing data, thereby improving touch performance.

[0018] According to the present disclosure, digital sensing data is compensated by adding sensing data corresponding to a removed pulse of a PWM signal to the sensing data to more accurately acquire the sensing data.

[0019] The effects according to the present disclosure are not limited to those exemplified above, and more various effects are included in the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a block diagram illustrating a touch display device according to an exemplary embodiment of the present disclosure;

[0022] Figure 2 is a view for explaining a touch panel according to an exemplary embodiment of the present disclosure;

[0023] Figure 3A is a view for explaining a vertical blank type time-division driving of a touch display device according to an exemplary embodiment of the present disclosure;

[0024] Figure 3B is a view for explaining horizontal blank type time-division driving of a touch display device according to an exemplary embodiment of the present disclosure;

[0025] Figure 3C 1 is a view for explaining a touch type performed in a horizontal blank type time-division driving of a touch display device according to an exemplary embodiment of the present disclosure.

[0026] Figure 4 is a view for explaining a touch driver of a touch display device according to an exemplary embodiment of the present disclosure;

[0027] Figure 5 is a view for explaining a sensing unit of a touch display device according to an exemplary embodiment of the present disclosure;

[0028] Figure 6 is a view for explaining a PWM modulator of a touch display device according to an exemplary embodiment of the present disclosure;

[0029] Figures 7A to 7D is a view for explaining an operation of a PWM modulator of a touch display device according to an exemplary embodiment of the present disclosure;

[0030] Figure 8 is a view for explaining a touch driver of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure;

[0031] Fig. 9 is a view for explaining an operation of a data compensator of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure;

[0032] Fig.10 is a flowchart for explaining a driving method of a touch display device according to an exemplary embodiment of the present disclosure;

[0033] Fig.11 is a flowchart for explaining a driving method of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure;

[0034] Fig.12 is a view for explaining a touch driver of a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure;

[0035] Fig.13 is a view for explaining a sensing unit of a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure;

[0036] Fig.14 is a view for explaining a sampling control circuit of a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure;

[0037] Figures 15A to 15D is a view for explaining an operation of a PWM modulator of a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure;

[0038] Fig.16 is a view for explaining a touch driver of a touch display device according to still another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure;

[0039] Fig.17 is a view for explaining an operation of a data compensator of a touch display device according to another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure;

[0040] Fig.18 is a flowchart for explaining a driving method of a touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure;

[0041] Fig.19is a flowchart for explaining a driving method of a touch display device according to another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure;

[0042] Fig. 20 is a view for explaining a PWM modulator of a touch display device according to still another exemplary embodiment (fifth exemplary embodiment) of the present disclosure; and

[0043] Fig.21 is a view for explaining a sampling control circuit of a touch display device according to still another exemplary embodiment (sixth exemplary embodiment) of the present disclosure. DETAILED DESCRIPTION

[0044] By referring to the exemplary embodiments described in detail below in conjunction with the accompanying drawings, the advantages and characteristics of the present disclosure and the methods for achieving the advantages and characteristics will become apparent. However, the present disclosure is not limited to the exemplary embodiments disclosed herein, but can be implemented in various forms. The exemplary embodiments are provided only as examples so that those skilled in the art can fully understand the disclosure of the present disclosure and the scope of the present disclosure. Therefore, the present disclosure is limited only by the scope of the appended claims.

[0045] The shapes, sizes, ratios, angles, quantities, etc. shown in the drawings for describing the exemplary embodiments of the present disclosure are merely examples, and the present disclosure is not limited thereto. Throughout the specification, the same reference numerals generally represent the same elements. In addition, in the following description of the present disclosure, detailed descriptions of known related technologies may be omitted to avoid making the subject matter of the present disclosure unnecessarily difficult to understand. Terms such as "including", "having" and "consisting of..." used herein are generally intended to allow the addition of other components, unless these terms are used together with the term "only". Unless otherwise expressly stated, any reference to the singular may include the plural.

[0046] Even if not explicitly stated, the components are interpreted as including the ordinary error range.

[0047] When terms such as “on,” “above,” “below,” and “next” are used to describe a positional relationship between two parts, one or more parts may be located between the two parts unless the terms are used together with the terms “immediately next to” or “directly.”

[0048] When an element or layer is disposed “on” another element or layer, the other layer or element can be directly on or interposed between the other elements.

[0049] Although the terms "first", "second", etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components. Therefore, the first component mentioned below can be the second component in the technical concept of the present disclosure.

[0050] Throughout the specification, like reference numerals generally refer to like elements.

[0051] The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present disclosure is not limited to the size and thickness of the illustrated components.

[0052] The features of the various embodiments of the present disclosure may be partially or completely dependent on or combined with each other, and may be interlocked and operated in various ways technically, and the embodiments may be performed independently of each other or in association with each other.

[0053] A low level of the signal may be defined as a first level, and a high level of the signal may be defined as a second level.

[0054] Hereinafter, a display device according to exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0055] Figure 1 is a block diagram illustrating a touch display device according to an exemplary embodiment of the present disclosure.

[0056] refer to Figure 1 The touch display device 100 includes a display panel 111 , a touch panel 113 , a gate driver 120 , a source driver 130 and a touch driver 140 .

[0057] The display panel 111 includes a substrate using glass or plastic and a plurality of gate lines GL and a plurality of data lines DL disposed on the substrate to cross each other. A plurality of pixels PX are defined at intersections of the plurality of gate lines GL and the plurality of data lines DL. An area in which a plurality of pixels realizing an image are disposed is referred to as a display area AA, and an area disposed outside the display area AA and in which the plurality of pixels PX are not disposed is referred to as a non-display area NA.

[0058] Each of the plurality of pixels PX of the display panel 111 includes at least one thin film transistor.

[0059] In addition, when the touch display device 100 according to the exemplary embodiment of the present disclosure is an electroluminescent display device, current is applied to the electroluminescent diodes provided in the plurality of pixels PX, and the discharged electrons and holes are coupled to generate excitons. The excitons emit light to realize the grayscale of the electroluminescent display device.

[0060] However, the touch display device 100 according to an exemplary embodiment of the present disclosure is not limited to an electroluminescent display device, but may be various types of display devices such as a liquid crystal display device.

[0061] The touch panel 113 senses a user's touch input. Specifically, the touch panel 113 includes a plurality of touch electrodes TE, each of which senses a user's touch. Here, the touch electrode TE may be formed to have a size corresponding to a size of a plurality of pixels PX.

[0062] The touch panel 113 may be manufactured separately from the display panel 111 to be attached to the display panel 111 as an additional type, or may be embedded in the display panel 111 .

[0063] Specifically, when the touch panel 113 is embedded in the display panel 111 , the plurality of touch electrodes TE may be provided as an in-cell type or an on-cell type, and in this case, the touch electrodes TE may be formed during a manufacturing process of the display panel 111 .

[0064] For example, the plurality of touch electrodes TE disposed on the touch panel 113 may be common electrodes corresponding to the plurality of pixels PX. Specifically, cathodes of the plurality of electroluminescent diodes disposed in the plurality of pixels PX may correspond to the touch electrodes TE.

[0065] The gate driver 120 sequentially supplies a gate voltage of an on voltage or an off voltage to the gate lines GL according to a gate control signal GCS output from the timing controller.

[0066] The gate control signal includes a gate start pulse, a gate shift clock, a gate output enable signal, and the like.

[0067] The above-mentioned gate start pulse controls the operation start timing of one or more gate circuits constituting the gate driver 120. The gate shift clock is a clock signal that is commonly input to one or more gate circuits and controls the shift timing of the scan signal (gate pulse). The gate output enable signal specifies the timing information of one or more gate circuits.

[0068] According to the driving method, the gate driver 120 may be located only on one side or on both sides of the display panel 111 as needed.

[0069] The gate driver 120 may include a shift register, a level shifter, or the like.

[0070] The source driver 130 converts digital image data applied from an external system into an analog data voltage Vdata based on a data control signal to output the converted analog data voltage to the data line DL.

[0071] The above data control signals include a source start pulse, a source sampling clock, a source output enable signal, and the like.

[0072] The source start pulse controls the data sampling start timing of one or more data circuits constituting the source driver 130. The source sampling clock is a clock signal that controls the sampling timing of data in each data circuit. The source output enable signal controls the output timing of the source driver 130.

[0073] The source driver 130 is connected to a bonding pad of the display panel 111 through a tape automated bonding method or a chip on glass method, or may be directly disposed on the display panel 111. The source driver 120 may be disposed to be integrated in the display panel 111, if necessary.

[0074] The source driver 130 may include a logic unit including various circuits such as a level shifter or latch unit, a digital-to-analog converter DAC, an output buffer, and the like.

[0075] The touch driver 140 is electrically connected to the touch electrode TE through the touch line TL to determine whether the user touches and the touch position. That is, when the user touches part of the touch panel 113, the touch driver 140 senses the touch signal of the touch electrode TE to determine whether the user touches the touch panel 113 and the touch position.

[0076] Specifically, the touch driver 140 may provide a touch driving signal to each touch electrode TE. The touch driver 140 may be applied with a touch sensing signal from each touch electrode TE. The touch driver 140 may sense a touch in the touch panel 113 through the above touch sensing signal.

[0077] The touch driver 140 may be combined with the source driver 130 to constitute a combined driver. Therefore, the combined driver not only converts digital image data applied from an external system into an analog data voltage Vdata based on a data control signal to output the converted analog data voltage to the data line DL, but also connects to the touch electrode TE through the touch line TL to determine whether there is a user's touch and the touch position.

[0078] Meanwhile, a method of sensing a touch using each touch electrode TE may be classified into a mutual capacitance type sensing a change in mutual capacitance of the touch electrodes TE and a self capacitance type sensing a change in self capacitance of the touch electrodes TE.

[0079] Hereinafter, it will be described that the touch display device 100 according to an exemplary embodiment of the present disclosure senses a touch through a self-capacitance type.

[0080] However, the touch driving type of the touch display device 100 according to an exemplary embodiment of the present disclosure is not limited to the self-capacitance type, but a mutual capacitance type sensing a change in mutual capacitance of the touch electrodes TE may also be applied if necessary.

[0081] Figure 2 is a view for explaining a touch panel according to an exemplary embodiment of the present disclosure.

[0082] like Figure 2 As shown, the touch panel 113 includes a plurality of touch electrodes TE arranged in a matrix. Figure 2 , a plurality of touch electrodes TE arranged in a matrix Q×R are shown. Here, Q and R are natural numbers greater than or equal to 1, respectively.

[0083] The plurality of touch electrodes TE may be electrically connected to a plurality of multiplexers MUX included in the touch driver through a plurality of touch lines TL. Specifically, each of the plurality of touch electrodes TE may be electrically connected to the MUX through at least one touch line TL.

[0084] That is, in Figure 2 In the embodiment, although it is shown that each of the plurality of touch electrodes TE is connected to one touch line TL, the present disclosure is not limited thereto, and each of the plurality of touch electrodes TE may be connected to a plurality of touch lines TL.

[0085] Specifically, a plurality of touch electrodes TE arranged in a column may be connected to one MUX. Figure 2 As shown, the touch panel 113 includes Q columns of touch electrodes TE, and each column of the Q columns of touch electrodes TE can be connected to one of the Q MUXs.

[0086] For example, Figure 2 As shown, R touch electrodes TE arranged in a column are connected to corresponding MUXs, or Q touch electrodes TE arranged in a row may be connected to corresponding MUXs. However, the present disclosure is not limited thereto. Among the R touch electrodes TE arranged in a column, the R / 2 touch electrodes TE arranged in the upper portion may be connected to any one MUX. In addition, among the R touch electrodes TE arranged in a column, the R / 2 touch electrodes TE arranged in the lower portion may be connected to another MUX. Alternatively, among the Q touch electrodes TE arranged in a row, the Q / 2 touch electrodes TE arranged on the left side may be connected to any one MUX. In addition, among the Q touch electrodes TE arranged in a row, the Q / 2 touch electrodes TE arranged on the right side may be connected to another MUX.

[0087] Meanwhile, the touch electrode TE may be formed by patterning the conductive metal layer. For example, the touch electrode TE may be formed of a transparent material such as indium tin oxide ITO. Therefore, light emitted from the display device 100 may pass through the touch electrode TE formed by the ITO electrode and be emitted to the outside. However, the present disclosure is not limited thereto, and the touch electrode TE may include an electrode pattern formed with a grid pattern, or may be formed of an opaque metal material having good conductivity corresponding to the cathode of the electroluminescent diode.

[0088] Figure 3A is a view for explaining a vertical blank type time-division driving of a touch display device according to an exemplary embodiment of the present disclosure.

[0089] Figure 3B is a view for explaining a horizontal blank type time-division driving of a touch display device according to an exemplary embodiment of the present disclosure.

[0090] Figure 3C 1 is a view for explaining a touch type performed in a horizontal blank type time-division driving of a touch display device according to an exemplary embodiment of the present disclosure.

[0091] In each of the plurality of frames, the touch display device 100 has two operation modes including a display mode and a touch sensing mode. The display period D corresponding to the display mode and the touch sensing period T corresponding to the touch sensing mode can be divided by time. Specifically, when the synchronization signal Tsync is at a low level, it can be the touch sensing period T, and when the synchronization signal Tsync is at a high level, it can be the display period D. However, the present disclosure is not limited thereto, and when the synchronization signal Tsync is at a high level, it can be the touch sensing period T, and when the synchronization signal Tsync is at a low level, it can be the display period D.

[0092] The above-mentioned synchronization signal Tsync is generated in the timing controller to be output to the source driver 130 and the touch driver 140. Therefore, according to the level of the synchronization signal Tsync, the source driver 130 and the touch driver 140 can drive the touch display device 100 in the display mode or the touch sensing mode.

[0093] For example, Figure 3A As shown, when the touch display device 100 is operated in a vertical blank driving mode, one frame period may include one display period D and one touch sensing period T. In addition, during one display period D, an image corresponding to one frame is displayed, and during one touch sensing period T, a touch driving signal is output to the touch electrode TE, so that a touch in the entire area or a partial area of ​​the touch panel 113 can be sensed. The touch driving signal may be a pulse width modulation PWM signal including a plurality of pulses.

[0094] like Figure 3B As shown, when the touch display device 100 is operated in the horizontal blank driving mode, one frame period is divided into a plurality of display periods D1, D2, D3 and a plurality of touch sensing periods T1, T2, T3. Therefore, one frame can be displayed during the plurality of display periods D1, D2 and D3, and a touch in the entire area or a partial area of ​​the touch panel 113 can be sensed during the plurality of touch sensing periods T1, T2 and T3. The number of display periods and touch sensing periods can be greater than 3.

[0095] More specifically, during each of the plurality of touch sensing periods T1 , T2 , T3 , T4 , T5 , and T6 , different types of touch sensing may be performed.

[0096] Specifically, if Figure 3C As shown, during the first touch sensing period T1, the pen position 1 of the first pen can be sensed, during the second touch sensing period T2, the pen data 1 of the first pen can be sensed, and during the third touch sensing period T3, the position Finger 1 of the finger in the first area can be sensed. In addition, during the fourth touch sensing period T4, the pen position 2 of the second pen can be sensed, during the fifth touch sensing period T5, the pen data 2 of the second pen can be sensed, and during the sixth touch sensing period T6, the position Finger 2 of the finger in the second area can be sensed. For reference, pen data collectively refers to the touch force of the pen, the thickness of the pen, the strength of the pen, etc.

[0097] That is, when the pen position and pen data are sensed in each of the multiple touch sensing periods T1, T2, T4 and T5, the positions and data of the multiple pens are sensed in the entire area. On the contrary, when the position of the finger is sensed in each of the multiple touch sensing periods T3 and T6, the position of the finger is sensed only in a partial area of ​​the display area AA.

[0098] In this regard, the frequency of the touch drive signal required for pen position sensing, the frequency of the touch drive signal required for pen data sensing, and the frequency required for finger position sensing may be different from each other. Therefore, the frequency of the touch drive signal output in the first touch sensing period T1 and the fourth touch sensing period T4, the frequency of the touch drive signal output in the second touch sensing period T2 and the fifth touch sensing period T5, and the frequency of the touch drive signal output in the third touch sensing period T3 and the sixth touch sensing period T6 are different from each other.

[0099] At the same time, despite Figure 3C2 shows that pen position sensing, pen data sensing, and finger position sensing are sequentially and repeatedly performed in each of a plurality of touch sensing periods T1, T2, T3, T4, T5, and T6, but the present disclosure is not limited thereto.

[0100] That is, according to the design of the touch display device, at least one pen position sensing, at least one pen data sensing, and at least one finger position sensing may be randomly performed during a plurality of touch sensing periods.

[0101] Figure 4 is a view for explaining a touch driver of a touch display device according to an exemplary embodiment of the present disclosure.

[0102] Figure 5 is a view for explaining a sensing unit of a touch display device according to an exemplary embodiment of the present disclosure.

[0103] In the touch display device according to the exemplary embodiment of the present disclosure, the touch driver 140 may include a touch sensing circuit 141, a touch control circuit 143 and a PWM modulator 145. The touch sensing circuit 141 may be provided in the form of an integrated circuit IC, and the touch control circuit 143 may be provided in the form of a micro control unit MCU.

[0104] The touch sensing circuit 141 detects a touch sensing signal TSS that varies according to whether a touch exists by driving the touch panel 113 .

[0105] Specifically, the touch sensing circuit 141 outputs a touch drive signal TDS to two or more touch electrodes TE, and converts an analog touch sensing signal TSS detected by each touch electrode TE to which the touch drive signal TDS is applied into digital sensing data SD to transmit the converted digital sensing data to the touch control circuit 143.

[0106] That is, the touch sensing circuit 141 may perform analog-to-digital conversion to convert the analog touch sensing signal TSS detected by each touch electrode TE applied with the touch driving signal TDS into digital sensing data SD.

[0107] Specifically, if Figure 4 As shown, the touch sensing circuit 141 includes a plurality of first multiplexers 141 - 1 , a plurality of sensing units 141 - 2 , a second multiplexer 141 - 3 , an analog-to-digital converter ADC 141 - 4 , and a slave processor 141 - 5 .

[0108] Each of the plurality of first multiplexers 141-1 selects one touch sensing signal TSS from the plurality of touch sensing signals TSS output from one column of touch electrodes TE. Specifically, each of the plurality of first multiplexers 141-1 is a circuit connected to the plurality of touch lines TL connected to the one column of touch electrodes TE and performs R:1 multiplexing. For example, Q first multiplexers 141-1 may select Q touch sensing signals TSS from the touch sensing signals TSS received from the plurality of touch electrodes TE arranged in a Q×R matrix.

[0109] The Q first multiplexers mentioned above can be connected to Figure 2 Q MUXs of the Q columns of touch electrodes TE are shown.

[0110] The plurality of sensing units 141 - 2 integrate the plurality of touch sensing signals TSS and sample the integrated value INT_TSS of the touch sensing signals. Each of the plurality of sensing units 141 - 2 may output a touch driving signal TDS to a corresponding touch electrode TE of the touch panel 113 .

[0111] In addition, each of the plurality of sensing units 141 - 2 is connected to each of the plurality of first multiplexers 141 - 1 in a one-to-one correspondence to integrate the touch sensing signal TSS selected by the first multiplexer 141 - 1 or output the touch driving signal TDS through the first multiplexer 141 - 1 .

[0112] For example, the Q sensing units 141 - 2 may be connected to the Q first multiplexers 141 - 1 in a one-to-one correspondence.

[0113] refer to Figure 5 , each of the plurality of sensing units 141 - 2 includes a pre-amplifier Pre-AMP, an integrator INTG, and a sample-and-hold circuit SHA.

[0114] The preamplifier Pre-AMP stores charges corresponding to the capacitance formed between the touch electrode TE and the touch object. Specifically, charges corresponding to the capacitance formed between the touch electrode TE and the touch object are stored in the feedback capacitor Cfb of the preamplifier Pre-AMP.

[0115] The pre-amplifier Pre-AMP may output the input touch driving signal TDS to the touch electrode TE through the first multiplexer 141 - 1 .

[0116] The integrator INTG outputs an integrated value INT_TSS of the touch sensing signal as an output voltage of the pre-amplifier Pre-AMP.

[0117] Such an integrator INTG may be constituted by an element such as a comparator or a capacitor. A signal output from the integrator INTG is input to the sample-and-hold circuit SHA.

[0118] The sample and hold circuit SHA is a circuit configured to sample and hold the integrated value INT_TSS of the touch sensing signal, and hold the integrated value INT_TSS of the touch sensing signal until the analog-to-digital converter ADC 141 - 4 finishes the previous conversion.

[0119] refer to Figure 4 , the second multiplexer 141-3 selects one touch sensing signal TSS from the plurality of touch sensing signals TSS output from the plurality of sensing units 141-2. Specifically, the second multiplexer 141-3 is a circuit connected to the plurality of sensing units 141-2 and performs Q:1 multiplexing. For example, the second multiplexer 141-3 selects one of the Q sensing units 141-2 to input the voltage held in the sample-and-hold circuit SHA of the selected sensing unit 141-2 to the analog-to-digital converter ADC 141-4.

[0120] The analog-to-digital converter ADC 141 - 4 converts the input voltage into digital sensing data SD to output the converted digital sensing data.

[0121] The output digital sensing data SD is transmitted to the touch control circuit 143 via the slave processor 141 - 5 of the touch sensing circuit 141 .

[0122] In a period in which the analog-to-digital converter ADC 141-4 converts the integrated value INT_TSS of the touch sensing signal into the digital sensing data SD, the analog-to-digital converter ADC 141-4 may output the ADC active signal ADC_Active to the PWM modulator 145. That is, during a period in which the analog-to-digital converter ADC 141-4 outputs the integrated value INT_TSS of the touch sensing signal as the digital sensing data SD, the ADC active signal ADC_Active may be a high level.

[0123] That is, only during a period in which the ADC active signal ADC_Active is at a high level, the integrated value INT_TSS of the analog touch sensing signal is applied to the analog-to-digital converter 141 - 4 and converted into the digital sensing data SD.

[0124] In summary, during the touch driving process, the analog-to-digital conversion process, and the sensing data SD transmission process, the touch sensing circuit 141 performs the analog-to-digital conversion process after performing the touch driving process. In addition, the touch sensing circuit 141 sequentially (sequentially) performs the sensing data SD transmission process after completing all the analog-to-digital conversion processes.

[0125] The touch control circuit 143 generates a PWM signal PWM including a plurality of pulses and receives the digital sensing data SD to determine touch information regarding the presence of a touch and a touch position based thereon.

[0126] The touch control circuit 143 may include a main processor 143 - 1 , a PWM generator 143 - 2 , and the like.

[0127] The slave processor 141 - 5 of the touch sensing circuit 141 and the master processor 143 - 1 of the touch control circuit 143 form a master-slave architecture, and data is transmitted and received therebetween via the communication interface I / F.

[0128] The communication interface I / F between the touch sensing circuit 141 and the touch control circuit 143 may be a serial peripheral interface SPI.

[0129] The serial peripheral interface SPI is an interface operating in a full-duplex mode which is a communication scheme in which the touch sensing circuit 141 and the touch control circuit 143 simultaneously transmit and receive data using independent lines, and is a synchronous serial data connection scheme.

[0130] The PWM generator 143 - 2 provides a PWM signal including a plurality of pulses to the PWM modulator 145 .

[0131] Specifically, the PWM generator 143 - 2 may provide the PWM signal PWM including a plurality of pulses to the PWM modulator 145 during the touch sensing period.

[0132] Figure 6 is a view for explaining a PWM modulator of a touch display device according to an exemplary embodiment of the present disclosure.

[0133] The PWM modulator 145 adjusts the number of pulses of the PWM signal PWM according to whether the ADC active signal ADC_Active overlaps with the synchronization signal Tsync. That is, the PWM modulator 145 removes at least one pulse of the plurality of pulses of the PWM signal PWM only when the operation period of the analog-to-digital converter ADC overlaps with the display period D.

[0134] The PWM modulator 145 outputs a modulated PWM signal MPWM to the plurality of sensing units 141 - 2 .

[0135] Specifically, if Figure 6 As shown, the PWM modulator 145 includes a comparator 145 - 1 and a PWM controller 145 - 2 . The comparator 145 - 1 compares the ADC active signal ADC_Active with the synchronization signal Tsync to determine whether the signals overlap. The PWM controller 145 - 2 adjusts the number of pulses of the PWM signal PWM.

[0136] The comparator 145-1 is applied with the ADC valid signal ADC_Active and the synchronization signal Tsync, and generates a high-level overlap signal OS when both the ADC valid signal ADC_Active and the synchronization signal Tsync are high. When either of the ADC valid signal ADC_Active and the synchronization signal Tsync is low, the comparator 145-1 generates a low-level overlap signal OS.

[0137] The above operation of the comparator 145 - 1 is based on the assumption that it is the touch sensing period T when the synchronization signal Tsync is at a low level, and it is the display period D when the synchronization signal Tsync is at a high level.

[0138] However, the present disclosure is not limited thereto, and in the case where it is the touch sensing period T when the synchronization signal Tsync is at a high level and it is the display period D when the synchronization signal Tsync is at a low level, the operation of the comparator 145 - 1 is as follows.

[0139] When the ADC valid signal ADC_Active is high and the synchronization signal Tsync is low, the comparator 145-1 generates a high-level overlap signal OS. Conversely, when both the ADC valid signal ADC_Active and the synchronization signal Tsync are low, the comparator 145-1 generates a low-level overlap signal OS.

[0140] When the overlap signal OS is at a high level, the PWM controller 145-2 removes at least one of the pulses of the PWM signal PWM. Specifically, when the overlap signal OS is at a high level, the PWM controller 145-2 may sequentially remove the last pulse of the pulses of the PWM signal PWM.

[0141] Despite Figure 4 14 shows that the PWM modulator 145 is provided separately from the touch sensing circuit 141 and the touch control circuit 143, but the present disclosure is not limited thereto. That is, the PWM modulator 145 may be included in the integrated circuit IC type touch sensing circuit 141 or the micro control unit MCU type touch control circuit 143.

[0142] In the following, reference will be made to Figures 7A to 7D An operation of a PWM modulator of a touch display device according to an exemplary embodiment of the present disclosure is described.

[0143] Figures 7A to 7D is a view for explaining an operation of a PWM modulator of a touch display device according to an exemplary embodiment of the present disclosure.

[0144] Specifically, Fig. 7A In the first frame period 1 stVarious signals used for touch sensing in the touch sensing period of the Frame, Figure 7B In the second frame period 2 nd Various signals used for touch sensing in the touch sensing period of the Frame, Figure 7C and 7D In the third frame period 3 rd Various signals used for touch sensing in the touch sensing period of a Frame.

[0145] refer to Fig. 7A , in the first frame period 1 st During the touch sensing period of the Frame, a plurality of PWM signals PWM are transmitted to the touch sensing circuit 141 .

[0146] For example, three PWM signals PWM are shown. The first PWM signal 1 st The second PWM signal 2 is output to the touch electrode TE via the first sensing unit 141-2 and the first multiplexer 141-1 as a touch driving signal TDS. nd The third PWM signal 3 is output to the touch electrode TE via the second sensing unit 141-2 and the second first multiplexer 141-1 as the touch driving signal TDS. rd The PWM is output to the touch electrode TE via the third sensing unit 141 - 2 and the third first multiplexer 141 - 1 as a touch driving signal TDS.

[0147] In the first frame period 1 st In the Frame, the synchronization signal Tsync drops from a high level to a low level, so that the touch display device 100 changes from the display mode to the touch sensing mode.

[0148] In the above description, the operation is based on the assumption that when the synchronization signal Tsync is at a low level, it is the touch sensing period T, and when the synchronization signal Tsync is at a high level, it is the display period D.

[0149] However, the present disclosure is not limited thereto, and when the synchronization signal Tsync is at a high level, it is the touch sensing period T, and when the synchronization signal Tsync is at a low level, it is the display period D. The synchronization signal Tsync rises from a low level to a high level. Therefore, the touch display device 100 changes from the display mode to the touch sensing mode.

[0150] Next, use the first PWM signal 1 st PWM generates a touch drive signal TDS, and outputs the touch drive signal TDS to the first touch electrode TE column. stAfter the falling time of the last pulse of PWM, the sampling and holding circuit SHA of the first sensing unit 141-2 is driven to sample and hold the integrated value INT_TSS of the touch sensing signal. The analog-to-digital converter ADC 141-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0151] At this time, the analog-to-digital converter ADC 141 - 4 may output a high-level ADC active signal ADC_Active.

[0152] In summary, as described above, the analog-to-digital converter ADC effective signal ADC_Active is a high-level square wave signal only when the analog-to-digital converter 141-4 converts the integrated value INT_TSS of the touch sensing signal into the sensing data SD, and is a low level in other periods. That is, the ADC effective signal ADC_Active is a square wave indicating whether the analog-to-digital converter 141-4 is operating. On the contrary, the digital sensing data SD converted by the analog-to-digital converter 141-4 is obtained by converting the integrated value INT_TSS of the analog touch sensing signal into a digital form, so that it is not a simple square form, but represents a predetermined digital value.

[0153] In addition, when the ADC valid signal ADC_Active is at a high level, the second PWM signal 2 is used. nd PWM generates a touch drive signal TDS, and outputs the generated touch drive signal TDS to the second touch electrode TE column. nd After the falling time of the last pulse of PWM, the sampling and holding circuit SHA of the second sensing unit 141-2 is driven to sample and hold the integrated value INT_TSS of the touch sensing signal. When the ADC effective signal ADC_Active is at a high level, the analog-to-digital converter ADC 141-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0154] In addition, when the ADC valid signal ADC_Active is at a high level, the third PWM signal 3 is used. rd PWM generates a touch drive signal TDS, and outputs the generated touch drive signal TDS to the third touch electrode TE column. rd After the falling time of the last pulse of PWM, the sampling and holding circuit SHA of the third sensing unit 141-2 is driven to sample and hold the integrated value INT_TSS of the touch sensing signal. When the ADC effective signal ADC_Active is at a high level, the analog-to-digital converter ADC 141-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0155] However, when outputting the third PWM signal 3 rd After PWM, when the ADC valid signal ADC_Active is at a high level, the synchronization signal Tsync rises to a high level. Therefore, during the period when both the ADC valid signal ADC_Active and the synchronization signal Tsync are at a high level, the comparator 145-1 generates a high-level overlap signal OS. The PWM controller 145-2 to which the high-level overlap signal OS is applied removes the third PWM signal 3 of the subsequent frame. rd The last pulse of PWM.

[0156] Therefore, if Figure 7B As shown, in the second frame period 2 nd Frame period, and the first frame period 1 st Frame is similar, outputting the first PWM signal 1 with eight pulses st PWM and second PWM signal 2 nd PWM. However, in 3 rd In PWM, the number of pulses can be reduced from eight pulses to seven pulses. A PWM signal PWM including eight pulses is only an example, and the number of pulses of the PWM signal can be multiple (N, N is a natural number of 1 or more). In this case, 3 rd The number of PWM pulses can be reduced to less than N, for example, 3 rd The number of PWM pulses can be N-1.

[0157] In addition, in the second frame period 2 nd During the Frame, the third PWM signal 3 is used rd PWM generates a touch drive signal TDS, and outputs the generated touch drive signal TDS to the third touch electrode TE column. rd After the falling time of the last pulse of PWM, the sampling and holding circuit SHA of the third sensing unit 141-2 is driven to sample and hold the integrated value INT_TSS of the touch sensing signal. When the ADC valid signal ADC_Active is at a high level, the analog-to-digital converter ADC141-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0158] However, when outputting the third PWM signal 3 rdAfter PWM, when the ADC valid signal ADC_Active is at a high level, the synchronization signal Tsync rises to a high level. Therefore, when both the ADC valid signal ADC_Active and the synchronization signal Tsync are at a high level, the comparator 145-1 generates a high-level overlap signal OS. The PWM controller 145-2 applied with the high-level overlap signal OS can remove the third PWM signal 3 of the subsequent frame. rd The last pulse of PWM ( Figure 7C or remove the second PWM signal 2 nd The last pulse of PWM ( Fig.7D ).

[0159] That is, the third PWM signal 3 of the subsequent frame rd The number of PWM pulses can be N-2 (such as Figure 7C ) or the second PWM signal 2 nd The number of PWM pulses can be N-1 (such as Fig.7D ).

[0160] Therefore, if Figure 7C As shown, in the third frame period 3 rd Frame period, and the first frame period 1 st Frame and second frame period 2 nd Frame is similar, outputting the first PWM signal 1 with eight pulses st PWM and second PWM signal 2 nd PWM. In the third frame period 3 rd In Frame, the third PWM signal 3 rd The number of PWM pulses can be reduced from seven to six.

[0161] Alternatively, if Fig.7D As shown, in the third frame period 3 rd Frame period, and the first frame period 1 st Frame and second frame period 2 nd Frame is similar, outputting the first PWM signal 1 with eight pulses st PWM. Outputs the third PWM signal 3 with seven pulses rd PWM, similar to the second frame period 2 nd Frame. In the third frame period 3 rd In Frame, the second PWM signal 2 nd The number of PWM pulses can be reduced from eight to seven.

[0162] In addition, in the third frame period 3 rd In Frame, use the third PWM signal 3rd PWM generates a touch drive signal TDS, and outputs the generated touch drive signal TDS to the third touch electrode TE column. rd After the falling time of the last pulse of PWM, the sampling and holding circuit SHA of the third sensing unit 141-2 is driven to sample and hold the integrated value INT_TSS of the touch sensing signal. When the ADC valid signal ADC_Active is at a high level, the analog-to-digital converter ADC141-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0163] However, when outputting the third PWM signal 3 rd After PWM, the ADC effective signal ADC_Active drops to a low level, and the synchronization signal Tsync rises to a high level. Therefore, in the third frame period, there is no period in which the ADC effective signal ADC_Active and the synchronization signal Tsync are both high, so that the comparator 145-1 generates a low-level overlap signal OS. At this time, the PWM controller 145-2 is applied with a low-level overlap signal OS, so that the pulse of the PWM signal PWM of the subsequent frame is no longer removed.

[0164] As described above, the PWM modulator 145 of the touch display device according to the exemplary embodiment of the present disclosure can sequentially advance the period of operation of the analog-to-digital converter by adjusting the number of pulses of the PWM signal. By doing so, the operation of the analog-to-digital converter can be completed within the touch sensing period of the touch display device according to the exemplary embodiment of the present disclosure. As a result, in the touch display device according to the exemplary embodiment of the present disclosure, due to the source channel switching for display driving, jitter is not generated in the digitally converted sensing data, thereby improving the touch performance.

[0165] Hereinafter, a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure will be described. The touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure is the same as the touch display device according to the exemplary embodiment of the present disclosure, except that a compensator configured to compensate for sensing data is added. Hereinafter, the compensator of the touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure will be described in detail.

[0166] Figure 8 is a view for explaining a touch driver of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure.

[0167] In a touch display device according to another exemplary embodiment (a second exemplary embodiment) of the present disclosure, a touch driver 240 may include a touch sensing circuit 241 , a touch control circuit 243 , and a PWM modulator 245 .

[0168] The touch control circuit 243 and the PWM modulator 245 are the same as the touch control circuit 143 and the PWM modulator 145 of the touch display device according to an exemplary embodiment of the present disclosure, and thus repeated descriptions will be omitted.

[0169] The touch sensing circuit 241 detects a touch sensing signal TSS that varies according to whether a touch exists by driving the touch panel 113 .

[0170] Specifically, the touch sensing circuit 241 outputs a touch drive signal TDS to two or more touch electrodes TE, and converts an analog touch sensing signal TSS detected by the touch electrode TE to which the touch drive signal TDS is applied into digital sensing data SD to transmit the converted digital sensing data to the touch control circuit 243.

[0171] That is, the touch sensing circuit 241 may perform analog-to-digital conversion to convert the analog touch sensing signal TSS detected by each touch electrode TE applied with the touch driving signal TDS into digital sensing data SD.

[0172] The touch sensing circuit 241 in the touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure may compensate for sensing data corresponding to a pulse removed from the modulated PWM signal MPWM in the PWM modulator 245 .

[0173] Specifically, if Figure 8 As shown, the touch sensing circuit 241 includes a plurality of first multiplexers 241 - 1 , a plurality of sensing units 241 - 2 , a second multiplexer 241 - 3 , an analog-to-digital converter ADC 241 - 4 , a data compensator 241 - 5 , and a slave processor 241 - 6 .

[0174] Each of the plurality of first multiplexers 241-1 selects one touch sensing signal TSS from the plurality of touch sensing signals TSS output from one column of touch electrodes TE. Specifically, each of the plurality of first multiplexers 241-1 is a circuit connected to the plurality of touch lines TL connected to one column of touch electrodes TE and performs R:1 multiplexing. For example, Q first multiplexers 241-1 may select Q touch sensing signals TSS from the touch sensing signals TSS received from the plurality of touch electrodes TE arranged in a Q×R matrix.

[0175] The plurality of sensing units 241 - 2 integrate the plurality of touch sensing signals TSS and sample the integrated value INT_TSS of the touch sensing signals. Each of the plurality of sensing units 241 - 2 may output a touch driving signal TDS to a corresponding touch electrode TE of the touch panel 113 .

[0176] In addition, each of the plurality of sensing units 241 - 2 is connected to the plurality of first multiplexers 241 - 1 in a one-to-one correspondence to integrate the touch sensing signal TSS selected by the first multiplexer 241 - 1 or output the touch driving signal TDS through the first multiplexer 241 - 1 .

[0177] For example, the Q sensing units 241 - 2 may be connected to the Q first multiplexers 241 - 1 in a one-to-one correspondence.

[0178] The second multiplexer 241-3 selects one touch sensing signal TSS from among the plurality of touch sensing signals TSS output from the plurality of sensing units 241-2. Specifically, the second multiplexer 241-3 is a circuit connected to the plurality of sensing units 241-2 and performs Q:1 multiplexing. For example, the second multiplexer 241-3 selects one of the Q sensing units 241-2 to input a voltage held in a sample-and-hold circuit SHA of the selected sensing unit 241-2 to the analog-to-digital converter ADC 241-4.

[0179] The analog-to-digital converter ADC241 - 4 converts the input voltage into digital sensing data SD to output the converted digital sensing data SD.

[0180] Furthermore, during a period in which the analog-to-digital converter ADC 241 - 4 operates, the analog-to-digital converter ADC 241 - 4 may output a high-level ADC active signal ADC_Active to the PWM modulator 245 .

[0181] Fig. 9 is a view for explaining an operation of a data compensator of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure.

[0182] The data compensator 241 - 5 compensates the converted digital sensing data SD to generate digital compensated sensing data CSD.

[0183] As described above, the PWM modulator 145 removes some pulses of the PWM signal PWM according to whether the ADC effective signal ADC_Active overlaps with the synchronization signal Tsync. Fig. 9 As shown, removing the second PWM signal 2 nd The twelfth pulse of the last pulse of PWM.

[0184] Therefore, after calculating the sensing data corresponding to the number of removed pulses, the data compensator 241 - 5 adds the digital sensing data SD input from the analog-to-digital converter ADC 241 - 4 to generate digital compensated sensing data CSD.

[0185] For example, assuming that the second PWM signal 2 nd When the sensing data SD of the first pulse to the eleventh pulse of PWM is 1100, the second PWM signal 2 nd The average sensing data of one pulse of PWM is set to 100. That is, the sensing data corresponding to the removed twelfth pulse may be set to 100.

[0186] Therefore, the data compensator 241 - 5 adds 100 as the sensing data corresponding to the removed twelfth pulse to 1100 as the sensing data SD using the first to eleventh pulses to generate compensated sensing data CSD.

[0187] The output digital compensated sensing data CSD is transmitted to the touch control circuit 243 via the slave processor 241 - 6 of the touch sensing circuit 241 .

[0188] In a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure, sensing data corresponding to the removed pulse of the PWM signal is added to the sensing data to compensate for the digital sensing data.

[0189] Therefore, in the touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure, jitter is not generated in the sensing data. In addition, even if the PWM signal is partially removed, the sensing data is not damaged.

[0190] As a result, the touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure may perform touch sensing more accurately.

[0191] Hereinafter, a driving method of a touch display device according to an exemplary embodiment of the present disclosure will be described. The driving method of a touch display device according to an exemplary embodiment of the present disclosure will be described based on the above-mentioned touch display device according to an exemplary embodiment of the present disclosure.

[0192] Fig.10 is a flowchart for explaining a driving method of a touch display device according to an exemplary embodiment of the present disclosure.

[0193] The driving method S100 of the touch display device according to the exemplary embodiment of the present disclosure includes a PWM generating step (PWM generation) S110, a signal comparing step (ADC_Active & Tsync comparison) S120, a PWM modulating step (PWM modulation) S130, a touch driving signal outputting step (TDS output) S140, a touch sensing signal inputting step (TSS input) S150, an analog-to-digital converting step S160 and a sensing data transmitting step (SD transmission) S170.

[0194] In the PWM generating step (PWM generation) S110 , a PWM signal including a plurality of pulses is generated.

[0195] Specifically, in the PWM generation step (PWM generation) S110, a plurality of PWM signals including a plurality of pulses may be generated. Figures 7A to 7D As shown, the first PWM signal 1 can be output st PWM, second PWM signal 2 nd PWM and the third PWM signal 3 rd PWM.

[0196] In the signal comparison step (ADC_Active & Tsync comparison) S120 , the ADC active signal ADC_Active and the synchronization signal Tsync are compared to determine whether the ADC active signal ADC_Active and the synchronization signal Tsync overlap.

[0197] In the signal comparison step (ADC_Active & Tsync comparison) S120, if Fig. 7A and 7B As shown, when both the ADC valid signal ADC_Active and the synchronization signal Tsync are at high level, a high level overlap signal OS is generated. In this case, after the PWM modulation step (PWM modulation) S130 is performed, the touch drive signal output step (TDS output) S140 is performed.

[0198] like Figure 7C and 7D As shown, when any one of the ADC valid signal ADC_Active and the synchronization signal Tsync is at a low level, a low level overlap signal OS is generated. In this case, the touch drive signal output step (TDS output) S140 is performed without performing the PWM modulation step (PWM modulation) S130.

[0199] In the PWM modulation step (PWM modulation) S130, when the overlap signal OS is at a high level, at least one of the multiple pulses of the PWM signal PWM is removed. Specifically, when the overlap signal OS is at a high level in the PWM modulation step (PWM modulation) S130, the last pulse of the multiple pulses of the PWM signal PWM can be removed in sequence.

[0200] For example, Fig. 7A and 7B As shown, when the overlapping signal OS is in the first frame period 1 st When the level in Frame is high, in the second frame period 2 nd Remove the third PWM signal in Frame 3 rd The last pulse of PWM.

[0201] As another example, Figure 7B and 7C As shown, when the overlapping signal OS is in the second frame period 2 nd When the level in Frame is high, in the third frame period 3 rd Remove the third PWM signal in Frame 3 rd The last pulse of PWM.

[0202] As another example, Figure 7B and 7D As shown, when the overlapping signal OS is in the second frame period 2 nd When the level in Frame is high, in the third frame period 3 rd Remove the second PWM signal 2 from Frame nd The last pulse of PWM.

[0203] That is, in the PWM modulation step (PWM modulation) S130, at least one pulse among a plurality of pulses of the PWM signal PWM is removed to generate the modulated PWM signal MPWM.

[0204] In the touch drive signal output step (TDS output) S140, the modulated PWM signal MPWM or the PWM signal PWM is output to the touch electrode TE of the touch panel 113 as the touch drive signal TDS.

[0205] Specifically, when the overlap signal OS is at a high level, in the PWM modulation step (PWM modulation) S130, at least one pulse of the plurality of pulses of the PWM signal PWM is removed to generate a modulated PWM signal MPWM. In addition, in the touch drive signal output step (TDS output) S140, the modulated PWM signal MPWM is output to each of the plurality of touch electrodes TE as a touch drive signal TDS.

[0206] On the contrary, when the overlapping signal OS is at a low level, the PWM modulation step (PWM modulation) S130 is not performed, but in the touch drive signal output step (TDS output) S140, the PWM signal PWM without removing the pulse is output to each of the multiple touch electrodes TE as the touch drive signal TDS.

[0207] In the touch sensing signal input step (TSS input) S150, the touch sensing circuit 141 receives the analog touch sensing signal TSS detected by each touch electrode TE to which the touch driving signal TDS is applied. In the touch sensing signal input step (TSS input) S150, the plurality of touch sensing signals TSS are integrated, and the integrated value INT_TSS of the touch sensing signal is sampled and held.

[0208] In the analog-to-digital conversion step S160 , the integrated value INT_TSS of the analog touch sensing signal is input to be converted into digital sensing data SD.

[0209] In the sensing data transmitting step (SD transmission) S170, digital sensing data SD is transmitted to determine touch information about the presence of a touch and a touch position based thereon.

[0210] The sensing data SD transmission is a master-slave architecture, and data is transmitted and received through a communication interface I / F. The communication interface I / F may be a serial peripheral interface SPI.

[0211] As described above, in the PWM modulation step (PWM modulation) S130 of the driving method of the touch display device according to the exemplary embodiment of the present disclosure, the number of pulses of the PWM signal can be reduced according to whether the ADC effective signal ADC_Active overlaps with the synchronization signal Tsync. By doing so, the timing of the analog-to-digital conversion step S160 can be performed in advance. Therefore, in the driving method of the touch display device according to the exemplary embodiment of the present disclosure, the analog-to-digital conversion step S160 can be completed within the touch sensing period. As a result, in the driving method of the touch display device according to the exemplary embodiment of the present disclosure, due to the switching of the source channel for display driving, no jitter is generated in the digitally converted sensing data SD, thereby improving the touch performance.

[0212] Hereinafter, a driving method of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure will be described. The driving method of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure is the same as the driving method of a touch display device according to an exemplary embodiment of the present disclosure, except for a sensing data compensation step and a compensated sensing data transmission step. Hereinafter, the sensing data compensation step and the compensated sensing data transmission step of the driving method of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure will be described in detail.

[0213] Fig.11 is a flowchart for explaining a driving method of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure.

[0214] A driving method S200 of a touch display device according to another exemplary embodiment (a second exemplary embodiment) includes a PWM generating step (PWM generation) S110, a signal comparing step (ADC_Active & Tsync comparison) S120, a PWM modulating step (PWM modulation) S130, a touch driving signal outputting step (TDS output) S140, a touch sensing signal inputting step (TSS input) S150, an analog-to-digital converting step S160, a sensing data compensating step (SD compensation) S270, and a compensated sensing data transmitting step (CSD transmission) S280.

[0215] The PWM generation step (PWM generation) S110, the signal comparison step (ADC_Active & Tsync comparison) S120, the PWM modulation step (PWM modulation) S130, the touch drive signal output step (TDS output) S140, the touch sensing signal input step (TSS input) S150, and the analog-to-digital conversion step S160 of the driving method S200 of the touch display device according to another exemplary embodiment (second exemplary embodiment) are the same as those of the driving method S100 of the touch display device according to the exemplary embodiment of the present disclosure. Therefore, the description thereof will be omitted.

[0216] In the sensing data compensation step (SD compensation) S270 , the digital sensing data SD converted in the analog-to-digital conversion step S160 is compensated to generate digital compensated sensing data CSD.

[0217] As described above, in the PWM modulation step (PWM modulation) S130, some pulses of the PWM signal PWM are removed according to whether the ADC effective signal ADC_Active overlaps with the synchronization signal Tsync. Fig. 9 As shown, removing the second PWM signal 2 ndThe twelfth pulse of the last pulse of PWM.

[0218] Therefore, in the sensing data compensation step (SD compensation) S270, after calculating sensing data corresponding to the number of removed pulses, the digital sensing data SD converted in the analog-to-digital conversion step S160 is added to generate digital compensated sensing data CSD.

[0219] For example, assuming that the second PWM signal 2 nd When the sensing data SD of the first pulse to the eleventh pulse of PWM is 1100, the second PWM signal 2 nd The average sensing data of one pulse of PWM is set to 100. That is, the sensing data corresponding to the removed twelfth pulse may be set to 100.

[0220] Therefore, in the sensing data compensation step (SD compensation) S270, 100 as sensing data corresponding to the removed twelfth pulse is added to 1100 as sensing data SD using the first to eleventh pulses to generate compensated sensing data CSD.

[0221] In the compensated sensing data transmitting step (CSD transmitting) S280, digital compensated sensing data CSD is transmitted to determine touch information about the presence of a touch and a touch position based thereon.

[0222] In a driving method of a touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure, sensing data corresponding to the removed pulses of the PWM signal are added to the sensing data to compensate for the digital sensing data.

[0223] Therefore, in the driving method of the touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure, jitter is not generated in the sensing data. In addition, even if the PWM signal is partially removed, the sensing data is not damaged.

[0224] As a result, the driving method of the touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure allows touch sensing to be performed more accurately.

[0225] Hereinafter, a touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure will be described. The difference between the touch display device according to the exemplary embodiment of the present disclosure and the touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure is that the sampling timing of the sample-hold circuit SHA is controlled. Hereinafter, the sampling timing control of the sample-hold circuit SHA of the touch display device according to another exemplary embodiment (second exemplary embodiment) of the present disclosure will be described in detail.

[0226] Fig.12 is a view for explaining a touch driver of a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure.

[0227] Fig.13 is a view for explaining a sensing unit of a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure.

[0228] In a touch display device according to yet another exemplary embodiment (third exemplary embodiment) of the present disclosure, a touch driver 340 may include a touch sensing circuit 341, a touch control circuit 343, and a sampling control circuit 345. The touch sensing circuit 341 may be provided in the form of an integrated circuit IC, and the touch control circuit 343 may be provided in the form of a micro control unit MCU.

[0229] The touch sensing circuit 341 detects a touch sensing signal TSS that varies according to whether a touch exists by driving the touch panel 113 .

[0230] Specifically, the touch sensing circuit 341 outputs a touch drive signal TDS to two or more touch electrodes TE, and converts an analog touch sensing signal TSS detected by the touch electrode TE to which the touch drive signal TDS is applied into digital sensing data SD to transmit the converted digital sensing data to the touch control circuit 343.

[0231] That is, the touch sensing circuit 341 may perform analog-to-digital conversion to convert the analog touch sensing signal TSS detected by each touch electrode TE to which the touch driving signal TDS is applied, into digital sensing data SD.

[0232] Specifically, if Fig.12 As shown, the touch sensing circuit 341 includes a plurality of first multiplexers 341 - 1 , a plurality of sensing units 341 - 2 , a second multiplexer 341 - 3 , an analog-to-digital converter ADC 341 - 4 , and a slave processor 341 - 5 .

[0233] Each of the plurality of first multiplexers 341-1 selects one touch sensing signal TSS from among the plurality of touch sensing signals TSS output from one column of touch electrodes TE. Specifically, each of the plurality of first multiplexers 341-1 is a circuit connected to a plurality of touch lines TL connected to one column of touch electrodes TE and performs R:1 multiplexing. For example, Q first multiplexers 341-1 may select Q touch sensing signals TSS from among the touch sensing signals TSS received from the plurality of touch electrodes TE arranged in a Q×R matrix.

[0234] Q The first multiplexer can be connected to Figure 2 Q MUXs of the Q columns of touch electrodes TE are shown in .

[0235] The plurality of sensing units 341 - 2 integrate the plurality of touch sensing signals TSS and sample the integrated value INT_TSS of the touch sensing signals. Each of the plurality of sensing units 341 - 2 may output a touch driving signal TDS to a corresponding touch electrode TE of the touch panel 113 .

[0236] In addition, each of the plurality of sensing units 341-2 is connected to each of the plurality of first multiplexers 341-1 in one-to-one correspondence to integrate the touch sensing signal TSS selected by the first multiplexer 341-1 or output the touch driving signal TDS through the first multiplexer 341-1.

[0237] For example, the Q sensing units 341 - 2 may be connected to the Q first multiplexers 341 - 1 in a one-to-one correspondence.

[0238] refer to Fig.13 , each of the plurality of sensing units 341 - 2 includes a pre-amplifier Pre-AMP, an integrator INTG, and a sample-and-hold circuit SHA.

[0239] The preamplifier Pre-AMP stores charges corresponding to the capacitance formed between the touch electrode TE and the touch object. Specifically, charges corresponding to the capacitance formed between the touch electrode TE and the touch object are stored in the feedback capacitor Cfb of the preamplifier Pre-AMP.

[0240] The pre-amplifier Pre-AMP may output the input touch driving signal TDS to the touch electrode TE through the first multiplexer 141 - 1 .

[0241] The integrator INTG outputs an integrated value INT_TSS of the touch sensing signal as an output voltage of the pre-amplifier Pre-AMP.

[0242] Such an integrator INTG may be constituted by an element such as a comparator or a capacitor. A signal output from the integrator INTG is input to the sample-and-hold circuit SHA.

[0243] The sample and hold circuit SHA is a circuit configured to sample and hold the integrated value INT_TSS of the touch sensing signal, and hold the integrated value INT_TSS of the touch sensing signal until the analog-to-digital converter ADC 341 - 4 finishes the previous conversion.

[0244] In a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure, the sampling timing of the sample and hold circuit SHA may be controlled by a sampling control signal SCS output from the sampling control circuit 345 .

[0245] refer to Fig.12 , the second multiplexer 341-3 selects a touch sensing signal TSS from the plurality of touch sensing signals TSS output from the plurality of sensing units 341-2. Specifically, the second multiplexer 341-3 is a circuit connected to the plurality of sensing units 341-2 and performs Q:1 multiplexing. For example, the second multiplexer 341-3 selects one of the Q sensing units 341-2 to input the voltage held in the sample-and-hold circuit SHA of the selected sensing unit 341-2 to the analog-to-digital converter ADC341-4.

[0246] The analog-to-digital converter ADC 341 - 4 converts the input voltage into digital sensing data SD to output the converted digital sensing data.

[0247] The output digital sensing data SD is transmitted to the touch control circuit 343 via the slave processor 341 - 5 of the touch sensing circuit 341 .

[0248] In a period in which the analog-to-digital converter ADC 141-4 converts the integrated value INT_TSS of the touch sensing signal into the digital sensing data SD, the analog-to-digital converter ADC 141-4 may output the ADC active signal ADC_Active to the PWM modulator 145. That is, during a period in which the analog-to-digital converter ADC 141-4 outputs the integrated value INT_TSS of the touch sensing signal as the digital sensing data SD, the ADC active signal ADC_Active may be a high level.

[0249] In summary, during the touch driving process, the analog-to-digital conversion process, and the sensing data SD transmission process, the touch sensing circuit 341 performs the analog-to-digital conversion process after performing the touch driving process. In addition, the touch sensing circuit 341 sequentially (sequentially) performs the sensing data SD transmission process after completing all the analog-to-digital conversion processes.

[0250] The touch control circuit 343 generates a PWM signal PWM including a plurality of pulses, and receives the digital sensing data SD to determine touch information regarding the presence of a touch and a touch position based thereon.

[0251] The touch circuit 343 may include a main processor 343 - 1 and a PWM generator 343 - 2 .

[0252] The slave processor 341 - 5 of the touch sensing circuit 341 and the master processor 343 - 1 of the touch control circuit 343 form a master-slave architecture, and transmit and receive data therebetween through the communication interface I / F.

[0253] The communication interface I / F between the touch sensing circuit 341 and the touch control circuit 343 may be a serial peripheral interface SPI.

[0254] The serial peripheral interface SPI is an interface operating in a full-duplex mode which is a communication scheme in which the touch sensing circuit 341 and the touch control circuit 343 simultaneously transmit and receive data using independent lines, and is a synchronous serial data connection scheme.

[0255] The PWM generator 343 - 2 provides a PWM signal PWM including a plurality of pulses to each of the plurality of sensing units 341 - 2 .

[0256] Specifically, the PWM generator 343 - 2 may provide the PWM signal PWM including a plurality of pulses to the plurality of sensing units 341 - 2 only during the touch sensing period.

[0257] Fig.14 is a view for explaining a sampling control circuit of a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure.

[0258] The sampling control circuit 345 controls the sampling timing of the sampling and holding circuit SHA according to whether the ADC active signal ADC_Active overlaps with the synchronization signal Tsub. That is, the sampling control circuit 345 generates the sampling control signal SCS for controlling the sampling timing of the sampling and holding circuit SHA only when the operation period of the analog-to-digital converter ADC overlaps with the display period D.

[0259] The sampling control circuit 345 outputs a sampling control signal SCS to the plurality of sensing units 341 - 2 .

[0260] Specifically, if Fig.14 As shown, the sampling control circuit 345 includes a comparator 345-1 and a sampling control signal generator (SCS generator) 345-2. The comparator 345-1 compares the ADC active signal ADC_Active with the synchronization signal Tsubc to determine whether the signals overlap, and the sampling control signal generator 345-2 generates a sampling control signal SCS to control the sampling timing of the sample-hold circuit SHA.

[0261] The comparator 345-1 is applied with the ADC valid signal ADC_Active and the synchronization signal Tsync, and generates a high-level overlap signal OS when both the ADC valid signal ADC_Active and the synchronization signal Tsync are high. When any one of the ADC valid signal ADC_Active and the synchronization signal Tsync is low, the comparator 345-1 generates a low-level overlap signal OS.

[0262] The above operation of the comparator 345 - 1 is based on the assumption that it is the touch sensing period T when the synchronization signal Tsync is at a low level, and it is the display period D when the synchronization signal Tsync is at a high level.

[0263] However, the present disclosure is not limited thereto, and in the case where the touch sensing period T is when the synchronization signal Tsync is at a high level and the display period D is when the synchronization signal Tsync is at a low level, the comparator 345 - 1 operates as follows.

[0264] When the ADC valid signal ADC_Active is high and the synchronization signal Tsync is low, the comparator 345-1 generates a high-level overlap signal OS. Conversely, when both the ADC valid signal ADC_Active and the synchronization signal Tsync are low, the comparator 345-1 generates a low-level overlap signal OS.

[0265] When the overlap signal OS is at a high level, the sampling control signal generator 345-2 generates a sampling control signal SCS that controls the sampling timing of the sample-hold circuit SHA. Specifically, when the overlap signal OS is at a high level, the sampling control signal generator 345-2 generates a sampling control signal SCS that controls the sample-hold circuit SHA to perform sampling before the last pulse of the plurality of pulses of the output PWM signal PWM.

[0266] Despite Fig.12 3 shows that the sampling control circuit 345 is provided separately from the touch sensing circuit 341 and the touch control circuit 343, but the present disclosure is not limited thereto. That is, the sampling control circuit 345 may be included in the integrated circuit IC type touch sensing circuit 341 or the micro control unit MCU type touch control circuit 343.

[0267] In the following, reference will be made to Figures 15A to 15D The sampling timing of the sample and hold circuit SHA according to the sampling control signal SCS in the touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure is described.

[0268] Figures 15A to 15Dis a view for explaining an operation of a PWM modulator of a touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure.

[0269] Specifically, Fig.15A In the first frame period 1 st Various signals used for touch sensing in the touch sensing period of the Frame, Fig. 15B In the second frame period 2 nd Various signals used for touch sensing in the touch sensing period of the Frame, Fig. 15C and 15D In the third frame period 3 rd Various signals used for touch sensing in the touch sensing period of a Frame.

[0270] refer to Fig.15A , in the first frame period 1 st During the touch sensing period of a Frame, a plurality of PWM signals PWM are transmitted.

[0271] For example, three PWM signals PWM are shown. The first PWM signal 1 st The second PWM signal 2 is output to the touch electrode TE via the first sensing unit 341-2 and the first multiplexer 341-1 as a touch driving signal TDS. nd The third PWM signal 341-1 is output to the touch electrode TE via the second sensing unit 341-2 and the second first multiplexer 341-1 as the touch driving signal TDS. rd The PWM is output to the touch electrode TE as a touch driving signal TDS via the third sensing unit 341 - 2 and the third first multiplexer 341 - 1 .

[0272] In the first frame period 1 st In the Frame, the synchronization signal Tsync drops from a high level to a low level, so that the touch display device 100 changes from the display mode to the touch sensing mode.

[0273] In the above description, the operation is based on the assumption that when the synchronization signal Tsync is at a low level it is the touch sensing period T, and when the synchronization signal Tsync is at a high level it is the display period D.

[0274] However, the present disclosure is not limited thereto, and when the synchronization signal Tsync is at a high level, it is the touch sensing period T, and when the synchronization signal Tsync is at a low level, it is the display period D, the synchronization signal Tsync rises from a low level to a high level. Therefore, the touch display device 100 changes from the display mode to the touch sensing mode.

[0275] Next, use the first PWM signal 1 st PWM generates a touch driving signal TDS, and outputs the generated touch driving signal TDS to the first touch electrode TE column. st After the falling time of the last pulse of PWM, the sampling and holding circuit SHA of the first sensing unit 341-2 is driven to sample and hold the integrated value INT_TSS of the touch sensing signal. The analog-to-digital converter ADC 141-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD. At this time, the analog-to-digital converter ADC 141-4 can output a high-level ADC valid signal ADC_Active.

[0276] In addition, when the ADC valid signal ADC_Active is at a high level, the second PWM signal 2 is used. nd PWM generates a touch drive signal TDS, and outputs the generated touch drive signal TDS to the second touch electrode TE column. nd After the falling time of the last pulse of PWM, the sampling and holding circuit SHA of the second sensing unit 341-2 is driven to sample and hold the integrated value INT_TSS of the touch sensing signal. When the ADC valid signal ADC_Active is at a high level, the analog-to-digital converter ADC341-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0277] In addition, when the ADC valid signal ADC_Active is at a high level, the third PWM signal 3 is used. rd PWM generates a touch drive signal TDS, and outputs the generated touch drive signal TDS to the third touch electrode TE column. rd After the falling time of the last pulse of PWM, the sampling and holding circuit SHA of the third sensing unit 341-2 is driven to sample and hold the integrated value INT_TSS of the touch sensing signal. When the ADC valid signal ADC_Active is at a high level, the analog-to-digital converter ADC341-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0278] However, when outputting the third PWM signal 3 rdAfter PWM, when the ADC effective signal ADC_Active is at a high level, the synchronization signal Tsync rises to a high level. Therefore, when both the ADC effective signal ADC_Active and the synchronization signal Tsync are at a high level, the comparator 345-1 generates a high-level overlap signal OS. The sampling control signal generator 345-2 applied with the high-level overlap signal OS generates a sampling control signal SCS, which makes the third PWM signal 3 of the subsequent frame rd The sampling timing of PWM is advanced.

[0279] Therefore, if Fig. 15B As shown, in the second frame period 2 nd Frame period, and the first frame period 1 st Frame is similar, outputting the first PWM signal 1 with eight pulses st PWM, second PWM signal 2 nd PWM and the third PWM signal 3 rd PWM. However, since the first frame period 1 of the previous frame st Frame, so in the second frame period 2 nd Frame 3's third PWM signal rd After seven of the eight pulses of PWM fall, the sampling and holding circuit SHA performs sampling. The PWM signal PWM including eight pulses is only an example, and the number of PWM signals PWM may be multiple (N, N is a natural number of 1 or more). In this case, after the third PWM signal 3 rd After N-1 pulses of PWM fall, the sample-and-hold circuit SHA performs sampling.

[0280] Therefore, the sampling and holding circuit SHA samples and holds the signal corresponding to the third PWM signal 3 rd The sampling and holding circuit SHA samples and holds the integrated value INT_TSS of the touch sensing signal of seven pulses among the eight pulses of the third PWM signal 3 rd The integrated value INT_TSS of the touch sensing signal of N-1 pulses among the N pulses of PWM. When the ADC effective signal ADC_Active is at a high level, the analog-to-digital converter ADC 341-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0281] However, when outputting the third PWM signal 3 rdAfter PWM, when the ADC effective signal ADC_Active is at a high level, the synchronization signal Tsync rises to a high level. Therefore, when both the ADC effective signal ADC_Active and the synchronization signal Tsync are at a high level, the comparator 345-1 generates a high-level overlap signal OS. The sampling control signal generator 345-2 applied with the high-level overlap signal OS can generate a sampling control signal SCS, which makes the third PWM signal 3 of the subsequent frame rd PWM sampling timing advance (such as Fig. 15C As shown) or the second PWM signal 2 nd PWM sampling timing advance (such as Fig.15D shown).

[0282] Therefore, if Fig. 15C As shown, in the third frame period 3 rd Frame period, and the first frame period 1 st Frame is similar, outputting the first PWM signal 1 with eight pulses st PWM, second PWM signal 2 nd PWM and the third PWM signal 3 rd PWM. However, since the second frame period 2 of the previous frame nd The sampling control signal SCS generated in the third frame period 3 rd Frame 3's third PWM signal rd After six of the eight pulses of PWM fall, the sampling and holding circuit SHA performs sampling. That is, after the third PWM signal 3 rd After N-2 pulses of PWM fall, the sample-and-hold circuit SHA can perform sampling.

[0283] Therefore, the sampling and holding circuit SHA samples and holds the signal corresponding to the third PWM signal 3 rd The sampling and holding circuit SHA samples and holds the integrated value INT_TSS of the touch sensing signal of six pulses among the eight pulses of the third PWM signal 3 rd The integrated value INT_TSS of the touch sensing signal of N-2 pulses among the N pulses of PWM. When the ADC effective signal ADC_Active is at a high level, the analog-to-digital converter ADC 341-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0284] Therefore, if Fig.15D As shown, in the third frame period 3 rd Frame period, and the first frame period 1 stFrame is similar, outputting the first PWM signal 1 with eight pulses st PWM, second PWM signal 2 nd PWM and the third PWM signal 3 rd PWM. However, since the second frame period 2 of the previous frame nd The sampling control signal SCS generated in the third frame period 3 rd Frame's second PWM signal 2 nd After seven of the eight pulses of PWM fall, the sampling and holding circuit SHA performs sampling. That is, after the second PWM signal 2 nd After N-1 pulses of PWM fall, the sample-and-hold circuit SHA performs sampling.

[0285] Therefore, the sample-and-hold circuit SHA samples and holds the signal corresponding to the second PWM signal 2 nd The integrated value INT_TSS of the touch sensing signal of seven pulses among the eight pulses of PWM. That is, the sampling and holding circuit SHA samples and holds the touch sensing signal corresponding to the second PWM signal 2 nd The integrated value INT_TSS of the touch sensing signal of N-1 pulses among the N pulses of PWM. When the ADC effective signal ADC_Active is at a high level, the analog-to-digital converter ADC 341-4 receives the integrated value INT_TSS of the analog touch sensing signal to convert the integrated value into digital sensing data SD.

[0286] However, when outputting the third PWM signal 3 rd After PWM, the ADC effective signal ADC_Active drops to a low level, and the synchronization signal Tsync rises to a high level. Therefore, there is no period in which both the ADC effective signal ADC_Active and the synchronization signal Tsync are high in the third frame period, so that the comparator 345-1 generates a low-level overlap signal OS. The sampling control signal generator 345-2 to which the high-level overlap signal OS is applied does not output the generated sampling control signal SCS, so that the sampling timing is not advanced in the subsequent frame.

[0287] As described above, the sampling control circuit 345 of the touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure adjusts the sampling timing of the sample-hold circuit SHA to sequentially advance the period of operation of the analog-to-digital converter. By doing so, the operation of the analog-to-digital converter can be completed within the touch sensing period of the touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure.

[0288] As a result, also in the touch display device according to still another exemplary embodiment (third exemplary embodiment) of the present disclosure, due to source channel switching for display driving, jitter is not generated in digitally converted sensing data, so that touch performance can be improved.

[0289] Hereinafter, a touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure will be described. The touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure is the same as the touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure, except that a compensator configured to compensate for sensing data is added. Hereinafter, the compensator of the touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure will be described in detail.

[0290] Fig.16 is a view for explaining a touch driver of a touch display device according to still another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure.

[0291] In a touch display device according to still another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure, a touch driver 440 may include a touch sensing circuit 441 , a touch control circuit 443 , and a sampling control circuit 445 .

[0292] The touch control circuit 443 and the sampling control circuit 445 are the same as the touch control circuit 343 and the sampling control circuit 345 of the touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure, and thus repeated descriptions will be omitted.

[0293] The touch sensing circuit 441 detects a touch sensing signal TSS that varies according to whether a touch exists by driving the touch panel 113 .

[0294] Specifically, the touch sensing circuit 441 outputs a touch drive signal TDS to two or more touch electrodes TE, and converts an analog touch sensing signal TSS detected by the touch electrode TE to which the touch drive signal TDS is applied into digital sensing data SD to transmit the converted digital sensing data to the touch control circuit 443.

[0295] That is, the touch sensing circuit 441 may perform analog-to-digital conversion to convert the analog touch sensing signal TSS detected by each touch electrode TE applied with the touch driving signal TDS into digital sensing data SD.

[0296] In a touch display device according to still another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure, the touch sensing circuit 441 may compensate for sensing data corresponding to a touch sensing signal that is not sampled in a plurality of sensing units 441 - 2 .

[0297] Specifically, if Fig.16 As shown, the touch sensing circuit 441 includes a plurality of first multiplexers 441 - 1 , a plurality of sensing units 441 - 2 , a second multiplexer 441 - 3 , an analog-to-digital converter 441 - 4 , a data compensator 441 - 5 , and a slave processor 441 - 6 .

[0298] Each of the plurality of first multiplexers 441-1 selects a touch sensing signal TSS from a plurality of touch sensing signals TSS output from a column of touch electrodes TE. Specifically, each of the plurality of first multiplexers 441-1 is a circuit connected to a plurality of touch lines TL connected to a column of touch electrodes TE and performs R:1 multiplexing. For example, Q first multiplexers 441-1 may select Q touch sensing signals TSS from the touch sensing signals TSS received from a plurality of touch electrodes TE arranged in a Q×R matrix.

[0299] The plurality of sensing units 441 - 2 integrate the plurality of touch sensing signals TSS and sample the integrated value INT_TSS of the touch sensing signals. Each of the plurality of sensing units 441 - 2 may output a touch driving signal TDS to a corresponding touch electrode TE of the touch panel 113 .

[0300] In addition, each of the plurality of sensing units 441 - 2 is connected to the plurality of first multiplexers 441 - 1 in a one-to-one correspondence to integrate the touch sensing signal TSS selected by the first multiplexer 441 - 1 or output the touch driving signal TDS through the first multiplexer 441 - 1 .

[0301] For example, the Q sensing units 441 - 2 may be connected to the Q first multiplexers 441 - 1 in a one-to-one correspondence.

[0302] The second multiplexer 441-3 selects one touch sensing signal TSS from among the plurality of touch sensing signals TSS output from the plurality of sensing units 441-2. Specifically, the second multiplexer 441-3 is a circuit connected to the plurality of sensing units 441-2 and performs Q:1 multiplexing. For example, the second multiplexer 441-3 selects one of the Q sensing units 441-2 to input a voltage held in a sample-and-hold circuit SHA of the selected sensing unit 441-2 to the analog-to-digital converter ADC441-4.

[0303] The analog-to-digital converter ADC 441 - 4 converts the input voltage into digital sensing data SD to output the converted digital sensing data SD.

[0304] Furthermore, during a period in which the analog-to-digital converter ADC 441 - 4 operates, the analog-to-digital converter ADC 441 - 4 may output a high-level ADC active signal ADC_Active to the sampling control circuit 445 .

[0305] Fig.17 is a view for explaining an operation of a data compensator of a touch display device according to another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure.

[0306] The data compensator 441 - 5 compensates the converted digital sensing data SD to generate digital compensated sensing data CSD.

[0307] As described above, depending on whether the ADC effective signal ADC_Active and the synchronization signal Tsync overlap, the sampling control circuit 345 does not sample the touch sensing signal TSS corresponding to some pulses of the PWM signal PWM. Fig.17 As shown, in the second PWM signal 2 nd After the eleventh pulse of PWM falls, the sample-and-hold circuit SHA performs sampling, and therefore, the touch sensing signal TSS corresponding to the twelfth pulse which is the last pulse is not sampled.

[0308] Therefore, after calculating sensing data corresponding to a plurality of touch sensing signals that are not sampled, the data compensator 441 - 5 adds the digital sensing data SD input from the analog-to-digital converter 441 - 4 to the calculated sensing data to generate digital compensated sensing data CSD.

[0309] For example, assuming that the second PWM signal 2 nd When the sensing data SD of the first pulse to the eleventh pulse of PWM is 1100, the second PWM signal 2 nd The average sensing data of one pulse of PWM is set to 100. That is, the sensing data corresponding to the removed twelfth pulse may be set to 100.

[0310] Therefore, the data compensator 441 - 5 adds 100 as the sensing data corresponding to the twelfth pulse which is not sampled to 1100 as the sensing data SD using the first to eleventh pulses to generate compensated sensing data CSD.

[0311] The output digital compensated sensing data CSD is transmitted to the touch control circuit 443 through the slave processor 441 - 6 of the touch sensing circuit 441 .

[0312] In a touch display device according to another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure, sensing data corresponding to a pulse of a PWM signal that is not sampled is added to sensing data to compensate for digital sensing data.

[0313] Therefore, in the touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure, jitter is not generated in the sensing data. In addition, even if the sampling timing of the PWM signal is advanced, the sensing data is not damaged.

[0314] As a result, the touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure may perform touch sensing more accurately.

[0315] Hereinafter, a driving method of a touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure will be described in detail. A driving method of a touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure will be described based on the touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure.

[0316] Fig.18 is a flowchart for explaining a driving method of a touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure.

[0317] According to another exemplary embodiment (third exemplary embodiment) of the present disclosure, a driving method S300 of a touch display device includes a PWM generating step (PWM generating) S310, a touch driving signal outputting step (TDS outputting) S320, a touch sensing signal inputting step (TSS inputting) S330, a signal comparing step (ADC_Active & Tsync comparing) S340, a sampling controlling step (sampling controlling) S350, an analog-to-digital converting step S360 and a sensing data transmitting step (SD transmitting) S370.

[0318] In the PWM generating step (PWM generation) S310, a PWM signal including a plurality of pulses is generated.

[0319] Specifically, in the PWM generation step (PWM generation) S310, a plurality of PWM signals including a plurality of pulses may be generated. Figures 15A to 15D As shown, the first PWM signal 1 can be output st PWM, second PWM signal 2 nd PWM and the third PWM signal 3 rd PWM.

[0320] In the touch drive signal output step (TDS output) S320, the PWM signal PWM is output to the touch electrode TE of the touch panel 113 as the touch drive signal TDS.

[0321] Specifically, in the touch driving signal output step (TDS output) S320, the PWM signal PWM without pulse removal is output to each of the plurality of touch electrodes TE as the touch driving signal TDS.

[0322] In the touch sensing signal input step (TSS input) S330, the touch sensing circuit 341 receives the analog touch sensing signal TSS detected by each touch electrode TE to which the touch driving signal TDS is applied.

[0323] In the signal comparison step (ADC_Active & Tsync comparison) S340 , the ADC active signal ADC_Active and the synchronization signal Tsync are compared to determine whether the ADC active signal ADC_Active and the synchronization signal Tsync overlap.

[0324] In the signal comparison step (ADC_Active & Tsync comparison) S340, if Fig.15A and 15B As shown, when both the ADC effective signal ADC_Active and the synchronization signal Tsync are high, a high level overlap signal OS is generated. In this case, according to the sampling control step S350, the timing of sampling the integrated value INT_TSS of the touch sensing signal is controlled and then maintained, and then the analog-to-digital conversion step S360 is performed.

[0325] like Fig. 15C and 15D As shown, when any one of the ADC effective signal ADC_Active and the synchronization signal Tsync is at a low level, a low level overlap signal OS is generated. In this case, the sampling control step S350 is not performed, and after sampling and holding the integrated value INT_TSS of the touch sensing signal, the analog-to-digital conversion step S360 is performed.

[0326] In the sampling control step S350, if the overlap signal OS is at a high level, the sampling timing of the sample-hold circuit SHA is advanced. Specifically, when the overlap signal OS is at a high level in the sampling control step S350, the sample-hold circuit SHA can be controlled to perform sampling before the last pulse of the plurality of pulses of the output PWM signal PWM.

[0327] For example, Fig.15A and 15B As shown, when the overlapping signal OS is in the first frame period 1 stFrame is high, then in the second frame period 2 nd Frame, when outputting the third PWM signal 3 rd Before the last pulse of PWM, the integrated value INT_TSS of the touch sensing signal is sampled.

[0328] As another example, Fig. 15B and 15C As shown, when the overlapping signal OS is in the second frame period 2 nd Frame is high, then in the third frame period 3 rd Frame, when outputting the third PWM signal 3 rd Before the last pulse of PWM, the integrated value INT_TSS of the touch sensing signal is sampled.

[0329] As another example, Fig. 15B and 15D As shown, when the overlapping signal OS is in the second frame period 2 nd Frame is high, then in the third frame period 3 rd Frame, when outputting the second PWM signal 2 nd Before the last pulse of PWM, the integrated value INT_TSS of the touch sensing signal is sampled.

[0330] That is, in the sampling control step S350 , the touch sensing signal TSS corresponding to at least one of the plurality of pulses of the PWM signal PWM is not sampled.

[0331] In the analog-to-digital conversion step S360 , the integrated value INT_TSS of the analog touch sensing signal is input to be converted into digital sensing data SD.

[0332] In the sensing data transmitting step (SD transmission) S370, digital sensing data SD is transmitted to determine touch information about the presence of a touch and a touch position based thereon.

[0333] The sensing data SD transmission is a master-slave architecture, and data is transmitted and received through a communication interface I / F. The communication interface I / F may be a serial peripheral interface SPI.

[0334] As described above, in the sampling control step S350 of the driving method of the touch display device according to another exemplary embodiment (the third exemplary embodiment) of the present disclosure, the sampling timing of the touch sensing signal TSS can be controlled according to whether the ADC effective signal ADC_Active overlaps with the synchronization signal Tsync. By doing so, the timing of the analog-to-digital conversion step S360 can be performed in sequence in advance. Therefore, in the driving method of the touch display device according to another exemplary embodiment (the third exemplary embodiment) of the present disclosure, the analog-to-digital conversion step S360 can be completed within the touch sensing period. As a result, in the driving method of the touch display device according to another exemplary embodiment (the third exemplary embodiment) of the present disclosure, due to the switching of the source channel for display driving, no jitter is generated in the digitally converted sensing data SD, thereby improving the touch performance.

[0335] Hereinafter, a driving method of a touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure will be described. The driving method of a touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure is the same as the driving method of a touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure, except for the sensing data compensation step and the compensated sensing data transmission step. Hereinafter, the sensing data compensation step and the compensated sensing data transmission step of the driving method of a touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure will be described in detail.

[0336] Fig.19 is a flowchart for explaining a driving method of a touch display device according to another exemplary embodiment (a fourth exemplary embodiment) of the present disclosure.

[0337] According to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure, a driving method S400 of a touch display device includes a PWM generating step (PWM generating) S310, a touch driving signal outputting step (TDS outputting) S320, a touch sensing signal inputting step (TSS inputting) S330, a signal comparing step (ADC_Active & Tsync comparing) S340, a sampling controlling step (sampling controlling) S350, an analog-to-digital converting step S360, a sensing data compensating step (SD compensating) S470 and a compensated sensing data transmitting step (CSD transmitting) S480.

[0338] The PWM generation step (PWM generation) S310, the touch drive signal output step (TDS output) S320, the touch sensing signal input step (TSS input) S330, the signal comparison step (ADC_Active & Tsync comparison) S340, the sampling control step (sampling control) S350 and the analog-to-digital conversion step S360 of the driving method S400 of the touch display device according to another exemplary embodiment (the fourth exemplary embodiment) of the present disclosure are the same as those of the driving method of the touch display device according to another exemplary embodiment (the third exemplary embodiment) of the present disclosure. Therefore, the description thereof will be omitted.

[0339] In the sensing data compensation step (SD compensation) S470, the digital sensing data SD converted in the analog-to-digital conversion step S360 is compensated to generate digital compensated sensing data CSD.

[0340] As described above, in the sampling control step S330, the sampling timing of the touch sensing signal TSS can be adjusted according to whether the ADC effective signal ADC_Active overlaps with the synchronization signal Tsync. Fig.17 As shown, the second PWM signal 2 is not sampled. nd The touch sensing signal TSS of the last pulse of PWM.

[0341] Therefore, in the sensing data compensation step (SD compensation) S470, after calculating sensing data corresponding to a plurality of touch sensing signals that are not sampled, the digital sensing data SD converted in the analog-to-digital conversion step S360 is added to generate digital compensated sensing data CSD.

[0342] For example, assuming that the second PWM signal 2 nd When the sensing data SD of the first pulse to the eleventh pulse of PWM is 1100, the second PWM signal 2 nd The average sensing data of one pulse of PWM is set to 100. That is, the sensing data corresponding to the removed twelfth pulse may be set to 100.

[0343] Therefore, in the sensing data compensation step (SD compensation) S470, 100, which is sensing data corresponding to the removed twelfth pulse, is added to 1100, which is sensing data SD using the first to eleventh pulses, to generate compensated sensing data CSD.

[0344] In the compensated sensing data transmitting step (CSD transmission) S480, digital compensated sensing data CSD is transmitted to determine touch information about the presence of a touch and a touch position based thereon.

[0345] In a driving method of a touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure, sensing data corresponding to a pulse of a PWM signal that is not sampled is added to sensing data to compensate for digital sensing data.

[0346] Therefore, in the method of driving a touch display device according to still another exemplary embodiment (fourth exemplary embodiment) of the present disclosure, jitter is not generated in the sensing data. In addition, even if the PWM signal is partially removed, the sensing data is not damaged.

[0347] As a result, the driving method of the touch display device according to another exemplary embodiment (fourth exemplary embodiment) of the present disclosure allows touch sensing to be performed more accurately.

[0348] Hereinafter, a touch display device according to another exemplary embodiment (fifth exemplary embodiment) of the present disclosure will be described. The difference between the touch display device according to the exemplary embodiment of the present disclosure and the touch display device according to another exemplary embodiment (fifth exemplary embodiment) is whether the PWM modulator operates according to different types of touches. Hereinafter, the PWM modulator of the touch display device according to another exemplary embodiment (fifth exemplary embodiment) of the present disclosure will be described in detail.

[0349] Fig. 20 is a view for explaining a PWM modulator of a touch display device according to still another exemplary embodiment (fifth exemplary embodiment) of the present disclosure.

[0350] like Fig. 20 As shown in , a PWM modulator 545 according to another exemplary embodiment (fifth exemplary embodiment) of the present disclosure includes a comparator 545-1 for comparing an ADC active signal ADC_Active with a synchronization signal Tsync to determine whether the signals overlap, a PWM controller 545-2 for adjusting the number of pulses of the PWM signal PWM, and a register 545-3 configured to determine whether the PWM controller is operating.

[0351] The comparator 545-1 is applied with the ADC valid signal ADC_Active and the synchronization signal Tsync, and generates a high level overlap signal OS when both the ADC valid signal ADC_Active and the synchronization signal Tsync are high level. When any one of the ADC valid signal ADC_Active and the synchronization signal Tsync is low level, the comparator 545-1 generates a low level overlap signal OS.

[0352] At the same time, if Figure 3CAs shown, in one frame, during each of a plurality of touch sensing periods ( T1 , T2 , T3 , T4 , T5 , and T6 ), any one of pen position sensing, pen data sensing, and finger position sensing is performed.

[0353] In this regard, the frequency of the touch drive signal required for pen position sensing, the frequency of the touch drive signal required for pen data sensing, and the frequency required for finger position sensing may be different from each other. Therefore, the frequency of the touch drive signal output in the first touch sensing period T1 and the fourth touch sensing period T4, the frequency of the touch drive signal output in the second touch sensing period T2 and the fifth touch sensing period T5, and the frequency of the touch drive signal output in the third touch sensing period T3 and the sixth touch sensing period T6 are different from each other.

[0354] Therefore, the overlap signal OS in the touch sensing periods T1 and T4 for sensing the pen position, the overlap signal OS in the touch sensing periods T2 and T5 for sensing the pen data, and the overlap signal OS in the touch sensing periods T3 and T6 for sensing the finger position may be different from each other.

[0355] The register 545 - 3 stores the overlap signal OS for each touch sensing period in which different types of touches are performed.

[0356] That is, register 545-3 stores the level of overlap signal OS in touch sensing periods T1 and T4 for sensing pen positions, the level of overlap signal OS in touch sensing periods T2 and T5 for sensing pen data, and the level of overlap signal OS in touch sensing periods T3 and T6 for sensing finger positions.

[0357] The level of the overlap signal OS refers to a high level or a low level of the overlap signal OS output by the comparator 545 - 1 in each touch sensing period ( T1 , T2 , T3 , T4 , T5 , and T6 ) of the previous frame.

[0358] That is, reference Figure 3C , the register 545-3 stores the levels of the overlap signal OS in the first touch sensing period T1 and the fourth touch sensing period T4, the levels of the overlap signal OS in the second touch sensing period T2 and the fifth touch sensing period T5, and the levels of the overlap signal OS in the third touch sensing period T3 and the sixth touch sensing period T6.

[0359] In some exemplary embodiments, the register 545 - 3 may not store the overlap signal OS output from the comparator 545 - 1 , but may autonomously store a set value of the overlap signal OS.

[0360] When the overlap signal OS in each touch sensing period stored in the register 545-3 is at a high level, the PWM controller 545-2 removes at least one pulse of the multiple pulses of the PWM signal PWM. Specifically, when the overlap signal OS in each touch sensing period stored in the register 545-3 is at a high level, the PWM controller 545-2 may sequentially remove the last pulse of the multiple pulses of the PWM signal PWM.

[0361] Therefore, the PWM controller 545 - 2 may remove or not remove at least one of the plurality of pulses of the PWM signal PWM for each touch sensing period in which different types of touches are performed.

[0362] For example, when in register 545-3, the overlapping signal OS in the first touch sensing period T1 and the fourth touch sensing period T4 is stored as a low level, the overlapping signal OS in the second touch sensing period T2 and the fifth touch sensing period T5 is stored as a high level, and the overlapping signal OS in the third touch sensing period T3 and the sixth touch sensing period T6 is stored as a low level, at least one pulse of the multiple pulses of the PWM signal PWM can be removed only in the second touch sensing period T2 and the fifth touch sensing period T5.

[0363] That is, the touch display device according to still another exemplary embodiment (fifth exemplary embodiment) of the present disclosure may determine whether to modulate the PWM signal for each touch sensing period in which different types of touches are performed.

[0364] Therefore, the touch display device according to still another exemplary embodiment (fifth exemplary embodiment) of the present disclosure modulates a PWM signal suitable for a touch type, so that jitter generated in sensing data can be suppressed with reduced power consumption.

[0365] Hereinafter, a touch display device according to another exemplary embodiment (sixth exemplary embodiment) of the present disclosure will be described. The difference between the touch display device according to another exemplary embodiment (third exemplary embodiment) of the present disclosure and the touch display device according to another exemplary embodiment (sixth exemplary embodiment) of the present disclosure lies in the operation of the sampling control circuit according to different types of touches. Hereinafter, a sampling control circuit of the touch display device according to another exemplary embodiment (sixth exemplary embodiment) of the present disclosure will be described in detail.

[0366] Fig.21 is a view for explaining a sampling control circuit of a touch display device according to still another exemplary embodiment (sixth exemplary embodiment) of the present disclosure.

[0367] like Fig.21As shown, a sampling control circuit 645 according to another exemplary embodiment (sixth exemplary embodiment) of the present disclosure includes: a comparator 645-1, which compares the ADC effective signal ADC_Active and the synchronization signal Tsync to determine whether the signals overlap; a sampling control signal generator (SCS_Generator) 645-2, which is configured to generate a sampling control signal SCS to control the sampling timing of the sample-and-hold circuit SHA; and a register 645-3, which is configured to determine whether the sampling control signal generator is operating.

[0368] The comparator 645-1 is applied with the ADC valid signal ADC_Active and the synchronization signal Tsync, and generates a high level overlap signal OS when both the ADC valid signal ADC_Active and the synchronization signal Tsync are high level. When any one of the ADC valid signal ADC_Active and the synchronization signal Tsync is low level, the comparator 645-1 generates a low level overlap signal OS.

[0369] At the same time, if Figure 3C As shown, in one frame, during each of a plurality of touch sensing periods T1, T2, T3, T4, T5, and T6, any one of pen position sensing, pen data sensing, and finger position sensing is performed.

[0370] In this regard, the frequency of the touch drive signal required for pen position sensing, the frequency of the touch drive signal required for pen data sensing, and the frequency required for finger position sensing may be different from each other. Therefore, the frequency of the touch drive signal output in the first touch sensing period T1 and the fourth touch sensing period T4, the frequency of the touch drive signal output in the second touch sensing period T2 and the fifth touch sensing period T5, and the frequency of the touch drive signal output in the third touch sensing period T3 and the sixth touch sensing period T6 are different from each other.

[0371] Therefore, the overlap signal OS in the touch sensing periods T1 and T4 for sensing the pen position, the overlap signal OS in the touch sensing periods T2 and T5 for sensing the pen data, and the overlap signal OS in the touch sensing periods T3 and T6 for sensing the finger position may be different from each other.

[0372] The register 645-3 stores the overlap signal OS for each touch sensing period for performing different types of touches. That is, the register 645-3 stores the levels of the overlap signal OS in the touch sensing periods T1 and T4 for sensing the pen position, the levels of the overlap signal OS in the touch sensing periods T2 and T5 for sensing the pen data, and the levels of the overlap signal OS in the touch sensing periods T3 and T6 for sensing the finger position.

[0373] That is, reference Figure 3C, the register 645-3 stores the levels of the overlap signal OS in the first touch sensing period T1 and the fourth touch sensing period T4, the levels of the overlap signal OS in the second touch sensing period T2 and the fifth touch sensing period T5, and the levels of the overlap signal OS in the third touch sensing period T3 and the sixth touch sensing period T6.

[0374] In some exemplary embodiments, the register 645 - 3 may not store the overlap signal OS output from the comparator 645 - 1 , but may autonomously store a set value of the overlap signal OS.

[0375] When the overlap signal OS in each touch sensing period stored in the register 645-3 is at a high level, the sampling control signal generator 645-2 generates a sampling control signal SCS that controls the sampling timing of the sample-hold circuit SHA. Specifically, when the overlap signal OS in each touch sensing period stored in the register 645-3 is at a high level, the sampling control signal generator 645-2 generates a sampling control signal SCS that controls the sample-hold circuit SHA to perform sampling before the last pulse of the plurality of pulses of the output PWM signal PWM.

[0376] Therefore, the PWM controller 645 - 2 may advance or not advance the sampling timing of the sample-and-hold circuit SHA for each touch sensing period in which different types of touches are performed.

[0377] For example, when in register 645-3, the overlapping signal OS in the first touch sensing period T1 and the fourth touch sensing period T4 is stored as a low level, the overlapping signal OS in the second touch sensing period T2 and the fifth touch sensing period T5 is stored as a high level, and the overlapping signal OS in the third touch sensing period T3 and the sixth touch sensing period T6 is stored as a low level, the sampling timing of the sampling and holding circuit SHA is advanced only in the second touch sensing period T2 and the fifth touch sensing period T5.

[0378] That is, the touch display device according to still another exemplary embodiment (sixth exemplary embodiment) of the present disclosure may determine whether to control the sampling timing for each touch sensing period in which different types of touches are performed.

[0379] Therefore, a touch display device according to still another exemplary embodiment (sixth exemplary embodiment) of the present disclosure controls sampling timing suitable for a touch type, so that jitter generated in sensing data can be suppressed with reduced power consumption.

[0380] Exemplary embodiments of the present disclosure may also be described as follows:

[0381] According to one aspect of the present disclosure, a touch display device includes: a touch panel, which is driven by a synchronization signal in time-division into a touch sensing period and a display period, and includes a plurality of touch electrodes; and a touch driver, which drives the touch panel. And the touch driver includes: a touch sensing circuit, which is configured to provide a touch drive signal to each of the plurality of touch electrodes, and to sample the integral value of the analog touch sensing signal detected by each of the plurality of touch electrodes to output digital sensing data; a touch control circuit, which is configured to generate a pulse width modulation PWM signal including a plurality of pulses, and receive sensing data to determine touch; and a sampling control circuit, which is configured to output a sampling control signal that controls the sampling timing of the integral value of the touch sensing signal to the touch sensing circuit. Therefore, jitter is not generated in the sensing data, thereby improving touch performance.

[0382] The touch driving signal is based on a PWM signal.

[0383] The touch sensing circuit may include a plurality of sensing units configured to integrate the touch sensing signal and sample the integrated value of the touch sensing signal and an analog-to-digital converter ADC configured to convert the integrated value of the touch sensing signal into digital sensing data.

[0384] Each of the plurality of sensing units may include: a preamplifier configured to output a touch drive signal to the plurality of touch electrodes; an integrator configured to integrate the touch sensing signal; and a sample-and-hold circuit configured to sample and hold an integrated value of the touch sensing signal.

[0385] The plurality of frames includes a first frame and a second frame subsequent to the first frame.

[0386] Only when the operation period of the analog-to-digital converter ADC overlaps with the display period in the first frame, the sampling control circuit outputs a sampling control signal that advances the sampling timing of the integrated value of the touch sensing signal to the sample-and-hold circuit in the second frame.

[0387] The analog-to-digital converter ADC may output the ADC valid signal of the second level to the sampling control circuit only when the integrated value of the touch sensing signal is converted into digital sensing data and the synchronization signal is the first level in the touch sensing period and the second level in the display period.

[0388] The sampling control circuit may include a comparator configured to determine whether the ADC valid signal and the synchronization signal overlap to output an overlap signal; and a sampling control signal generator configured to generate the sampling control signal according to the overlap signal.

[0389] When both the ADC valid signal and the synchronization signal are at the second level, the comparator may generate an overlap signal at the second level; and when any one of the ADC valid signal and the synchronization signal is at the first level, the comparator generates an overlap signal at the first level.

[0390] The sampling control signal generator may generate the sampling control signal only when the overlap signal is at the second level.

[0391] The register is configured to store an overlap signal for each touch sensing period in which different types of touches may be performed.

[0392] The touch sensing circuit may further include a data compensator configured to compensate the digital sensing data output from the analog-to-digital converter to generate digital compensated sensing data.

[0393] The data compensator may add the digital sensing data input from the analog-to-digital converter ADC to the sensing data corresponding to the unsampled touch sensing signal to generate compensated sensing data.

[0394] According to another aspect of the present disclosure, a method for driving a touch display device includes: a PWM generating step of generating a pulse width modulated PWM signal including a plurality of pulses; a touch driving signal outputting step of outputting the PWM signal as a touch driving signal to each of the plurality of touch electrodes; a touch sensing signal inputting step of receiving an analog touch sensing signal detected by each of the plurality of touch electrodes; a signal comparing step of determining whether an ADC valid signal and a synchronization signal overlap in a first frame to output an overlap signal; a sampling control step of advancing a sampling timing of an integral value of a touch sensing signal in a second frame and holding the integral value; an analog-to-digital conversion step of receiving the integral value of the analog touch sensing signal to convert the integral value into digital sensing data; and a sensing data transmitting step of transmitting the digital sensing data to determine touch information about the presence of a touch and a touch position based on the sensing data, and the ADC valid signal is at a second level only when an analog-to-digital converter ADC included in the touch driver operates and the synchronization signal is at a first level in a touch sensing period and at a second level in a display period, thereby improving touch performance.

[0395] In the signal comparison step, when both the ADC valid signal and the synchronization signal are at the second level, an overlap signal of the second level may be generated, and when either the ADC valid signal or the synchronization signal is at the first level, an overlap signal of the first level may be generated.

[0396] When the overlap signal is at the second level, in the sampling control step, the integrated value of the touch sensing signal may be sampled before a last pulse of a plurality of pulses of the output PWM signal.

[0397] The method for driving a touch display device may further include a sensing data compensating step of adding the digital sensing data converted in the analog-to-digital converting step to sensing data corresponding to the touch sensing signal not sampled in the sampling controlling step to generate compensated sensing data.

[0398] In the sensing data transmitting step, digital compensated sensing data may be transmitted to determine touch information regarding the presence and touch position of a touch based on the compensated sensing data.

[0399] Although the exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and can be embodied in many different forms without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments of the present disclosure are provided for illustrative purposes only and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Therefore, it should be understood that the above exemplary embodiments are illustrative in all aspects and do not limit the present disclosure. The scope of protection of the present disclosure should be interpreted based on the following claims, and all technical concepts within their equivalent scope should be interpreted as belonging to the scope of the present disclosure.

Claims

1. A touch display device, comprising: a touch panel which is time-divisionally driven by a synchronization signal into a touch sensing period and a display period in each of a plurality of frames and includes a plurality of touch electrodes; as well as a touch driver that drives the touch panel, Wherein, the touch driver comprises: a touch sensing circuit configured to provide a touch driving signal to each of the plurality of touch electrodes and to sample an integrated value of an analog touch sensing signal detected by each of the plurality of touch electrodes to output digital sensing data; a touch control circuit configured to generate a PWM signal including a plurality of pulses and receive the digital sensing data to determine a touch, the touch drive signal being based on the PWM signal; and a sampling control circuit configured to output a sampling control signal to the touch sensing circuit, wherein the sampling control signal controls a sampling timing of the integrated value of the touch sensing signal, Wherein, the touch sensing circuit comprises: a plurality of sensing units configured to integrate the touch sensing signal and sample the integrated value of the touch sensing signal; and an analog-to-digital converter ADC configured to convert the integrated value of the touch sensing signal into digital sensing data, The analog-to-digital converter ADC outputs a second-level ADC valid signal to the sampling control circuit only when the integrated value of the touch sensing signal is converted into digital sensing data and the synchronization signal is at the first level in the touch sensing period and at the second level in the display period.

2. The touch display device according to claim 1, wherein: Each of the plurality of sensing units comprises: a preamplifier configured to output a touch drive signal to a plurality of touch electrodes; an integrator configured to integrate the touch sensing signal; and The sample-and-hold circuit is configured to sample and hold an integrated value of the touch sensing signal.

3. The touch display device according to claim 2, in, The plurality of frames include a first frame and a second frame subsequent to the first frame, The sampling control circuit outputs a sampling control signal that advances the sampling timing of the integrated value of the touch sensing signal to the sample-and-hold circuit in the second frame only when the operation period of the analog-to-digital converter ADC overlaps with the display period in the first frame.

4. The touch display device according to claim 1, wherein: The sampling control circuit comprises: a comparator configured to determine whether the ADC valid signal and the synchronization signal overlap to output an overlap signal; and A sampling control signal generator is configured to generate the sampling control signal according to the overlapping signal.

5. The touch display device according to claim 4, wherein: When both the ADC valid signal and the synchronization signal are at the second level, the comparator generates an overlap signal at the second level, and when either one of the ADC valid signal and the synchronization signal is at the first level, the comparator generates an overlap signal at the first level.

6. The touch display device according to claim 4, wherein: The sampling control signal generator generates the sampling control signal only when the overlap signal is at a second level.

7. The touch display device according to claim 4, wherein: The sampling control circuit also includes: A register is configured to store an overlap signal for each touch sensing period in which a different type of touch is performed.

8. The touch display device according to claim 1, wherein: The touch sensing circuit further includes: The data compensator is configured to compensate the digital sensing data output from the analog-to-digital converter to generate digital compensated sensing data.

9. The touch display device according to claim 8, wherein: The data compensator adds the digital sensing data input from the analog-to-digital converter ADC to the sensing data corresponding to the unsampled touch sensing signal to generate compensated sensing data.

10. A method for driving a touch display device, the touch display device comprising: a touch panel which is time-divisionally driven by a synchronization signal into a touch sensing period and a display period in each of a plurality of frames and includes a plurality of touch electrodes; and a touch driver for driving the touch panel, wherein the plurality of frames include a first frame and a second frame following the first frame, and the driving method includes: A PWM generating step, generating a PWM signal including a plurality of pulses; a touch drive signal outputting step, outputting the PWM signal as a touch drive signal to each of the plurality of touch electrodes, wherein the touch drive signal is based on the PWM signal; a touch sensing signal input step of receiving a simulated touch sensing signal detected by each of the plurality of touch electrodes; A signal comparison step, determining whether the ADC effective signal and the synchronization signal overlap in the first frame, so as to output an overlap signal; a sampling control step of advancing the sampling timing of the integral value of the touch sensing signal in the second frame and maintaining the integral value; an analog-to-digital conversion step, receiving the integrated value of the touch sensing signal to convert the integrated value into digital sensing data; and a sensing data transmitting step of transmitting the digital sensing data to determine touch information about the presence and touch position of a touch based on the digital sensing data, The ADC valid signal is at the second level only when the analog-to-digital converter ADC included in the touch driver operates and the synchronization signal is at the first level in the touch sensing period and at the second level in the display period.

11. The driving method according to claim 10, wherein: In the signal comparison step, when both the ADC valid signal and the synchronization signal are at the second level, an overlap signal of the second level is generated, and when either the ADC valid signal or the synchronization signal is at the first level, an overlap signal of the first level is generated.

12. The driving method according to claim 11, wherein: When the overlap signal is at the second level, in the sampling control step, the integrated value of the touch sensing signal is sampled before a last pulse of a plurality of pulses of the output PWM signal.

13. The driving method according to claim 12, further comprising: A sensing data compensating step of adding the digital sensing data converted in the analog-to-digital converting step to sensing data corresponding to the touch sensing signal not sampled in the sampling controlling step to generate compensated sensing data.

14. The driving method according to claim 13, wherein: In the sensing data transmitting step, digital compensated sensing data is transmitted to determine touch information regarding the presence and touch position of a touch based on the compensated sensing data.

Images