Touch display device and touch driving circuit

Abstract

Disclosed are a touch display device and a touch driving circuit. An operation period of the touch display device may include a first touch sensing mode period in which a first touch driving signal having a first amplitude is applied to the touch sensor and a second touch sensing mode period in which a second touch driving signal having a second amplitude is applied to the touch sensor. A second touch drive signal having a second amplitude different from the first amplitude is applied to the touch sensor. A first touch driving signal may be sequentially applied to each of the plurality of first touch electrodes during a first touch sensing mode period, and a second touch driving signal may be sequentially applied to each of the plurality of first touch electrodes during a second touch sensing mode period. The second touch driving signal may be simultaneously applied to two or more first touch electrodes electrically connected to each other among the plurality of first touch electrodes, or the second touch driving signal may be simultaneously applied to two or more second touch electrodes electrically connected to each other among the plurality of second touch electrodes.

Description

Technical Field

[0001] Example embodiments of the present disclosure relate to a touch display device and a touch driving circuit, and more particularly, for example but not limited to, relate to a touch display device and a touch driving circuit capable of supporting various touch sensing modes. Background Art

[0002] Recently, a touch display device capable of detecting a touch of a user's finger or a pen and providing a touch-based input processing function has been developed.

[0003] In order to enable such a touch display device to provide more various application functions, various forms of touch sensing are required. For example, a wearable device may not only need to sense contact touch in the form of a user touching the screen, but also need to sense non-contact touch (e.g., hovering touch) in the form of a user not touching the screen.

[0004] The description provided in the description of the background technology section should not be assumed to be prior art simply because it is mentioned in the description of the background technology section or is associated with the description of the background technology section. The description of the background technology section may include information describing one or more aspects of the subject technology, and the description in this part does not limit the present invention. Summary of the invention

[0005] The inventors have recognized that various forms of touch sensing are needed. Therefore, example embodiments of the present disclosure may provide a touch display device, a touch driving circuit, and a touch controller capable of supporting various touch sensing modes.

[0006] Example embodiments of the present disclosure may provide a touch display device, a touch driving circuit, and a touch controller capable of efficiently sensing a contact touch and a suspended touch.

[0007] Example embodiments of the present disclosure may provide a touch display device, a touch driving circuit, and a touch controller having a circuit structure and a control structure capable of efficiently sensing a contact touch and a floating touch.

[0008] Example embodiments of the present disclosure may provide a touch display device, a touch driving circuit, and a touch controller having a control signal system capable of efficiently supporting a display mode, a contact touch sensing mode, and a floating touch sensing mode.

[0009] A touch display device according to an example embodiment of the present disclosure may include a touch sensor including a plurality of first touch electrodes and a plurality of second touch electrodes, and a touch driving circuit for driving the touch sensor.

[0010] The operation mode of the touch display device may include a display mode and a touch sensing mode. The display mode and the touch sensing mode may be switched to each other or may be performed simultaneously.

[0011] The touch sensing mode may include a first touch sensing mode and a second touch sensing mode. The first touch sensing mode and the second touch sensing mode may be performed in time periods separated in time. That is, the first touch sensing mode and the second touch sensing mode may not overlap each other in time.

[0012] The operation period of the touch display device may include a first touch sensing mode period and a second touch sensing mode period. In the first touch sensing mode period, a first touch drive signal having a first amplitude is applied to the touch sensor, and in the second touch sensing mode period, a second touch drive signal having a second amplitude different from the first amplitude is applied to the touch sensor.

[0013] The first touch driving signal may be sequentially or simultaneously applied to the plurality of first touch electrodes during the first touch sensing mode period.

[0014] During the second touch sensing mode period, the second touch drive signal can be simultaneously applied to two or more first touch electrodes electrically connected to each other among the multiple first touch electrodes, or the second touch drive signal can be simultaneously applied to two or more second touch electrodes electrically connected to each other among the multiple second touch electrodes.

[0015] For example, the first touch sensing mode period may be a period for sensing a contact touch that contacts the screen, and the second touch sensing mode period may be a period for sensing a hovering touch that does not contact the screen.

[0016] The second amplitude of the second touch driving signal in the second touch sensing mode period may be greater than the first amplitude of the first touch driving signal in the first touch sensing mode period.

[0017] The second touch sensing mode period may include a first sub-sensing period and a second sub-sensing period which do not overlap with each other.

[0018] During the first sub sensing period of the second touch sensing mode period, the second touch driving signal may be simultaneously applied to two or more first touch electrodes electrically connected to each other among the plurality of first touch electrodes.

[0019] During a second sub sensing period of the second touch sensing mode period, a second touch driving signal may be simultaneously applied to two or more second touch electrodes electrically connected to each other among the plurality of second touch electrodes.

[0020] A touch display device according to an example embodiment of the present disclosure may include: a display panel including a plurality of sub-pixels and a plurality of touch electrodes; a display driving circuit for driving the plurality of sub-pixels; a touch driving circuit for supplying a touch driving signal to at least one touch electrode among the plurality of touch electrodes; a display controller for controlling the display driving circuit and supplying a first mode control signal to the touch controller; and a touch controller for supplying a second mode control signal to the touch driving circuit.

[0021] The operation period of the touch display device may include a display mode period and a touch sensing mode period, and the touch sensing mode period may include a first touch sensing mode period and a second touch sensing mode period.

[0022] The display mode period, the first touch sensing mode period, and the second touch sensing mode period may be distinguished by the first mode control signal and the second mode control signal.

[0023] For example, the first mode control signal may include a first signal portion having a first level voltage and a second signal portion having a second level voltage different from the first level voltage, and the second mode control signal may include a third signal portion having a third level voltage and a fourth signal portion having a fourth level voltage different from the third level voltage.

[0024] For example, during the display mode period, the first mode control signal may have a second level voltage, and the second mode control signal may have a third level voltage.

[0025] For example, during the first touch sensing mode period, the first mode control signal may have a first level voltage, and the second mode control signal may have a third level voltage.

[0026] For example, during the second touch sensing mode period, the first mode control signal may have a first level voltage, and the second mode control signal may have a fourth level voltage.

[0027] For example, the first mode control signal may be a control signal for dividing the operation period into a display mode period and a touch sensing mode period, and the second mode control signal may be a control signal for dividing the touch sensing mode period into a first touch sensing mode period and a second touch sensing mode period.

[0028] For example, the first mode control signal may be a vertical synchronization signal for dividing one display frame period into an active period and a blanking period. The active period may be a display mode period, and the blanking period may be a touch sensing mode period.

[0029] A touch drive circuit according to an example embodiment of the present disclosure may include: two or more amplifiers corresponding to a plurality of first touch electrodes; two or more charge amplifiers corresponding to a plurality of second touch electrodes and each including a feedback capacitor; a first control switch circuit that controls all or part of the plurality of first touch electrodes to be connected to all or part of the two or more amplifiers; or controls all or part of the plurality of first touch electrodes to be connected to all or part of the two or more charge amplifiers, or controls the plurality of first touch electrodes to be separated from the two or more amplifiers and the two or more charge amplifiers; and a second control switch circuit that controls all or part of the plurality of second touch electrodes to be connected to all or part of the two or more charge amplifiers, or controls all or part of the plurality of second touch electrodes to be separated from the two or more charge amplifiers.

[0030] The operation period of the touch driving circuit may include a first touch sensing mode period and a second touch sensing mode period which do not overlap each other, and the second touch sensing mode period may include a first sub-sensing period and a second sub-sensing period which do not overlap each other.

[0031] During the first sub-sensing period, two or more first touch electrodes among the plurality of first touch electrodes may be electrically connected to each other.During the second sub-sensing period, two or more second touch electrodes among the plurality of second touch electrodes may be electrically connected to each other.

[0032] During the first touch sensing mode period, the first control switch circuit may connect two or more first touch electrodes and two or more amplifiers corresponding to each other in sequence, and the second control switch circuit may connect two or more second touch electrodes and two or more charge amplifiers corresponding to each other.

[0033] The second touch sensing mode period may include a first sub-sensing period and a second sub-sensing period which do not overlap with each other.

[0034] During the first sub-sensing period, the first control switch circuit may connect the two or more first touch electrodes to a specific charge amplifier among the two or more charge amplifiers, and the second control switch circuit may separate the two or more second touch electrodes from the two or more charge amplifiers.

[0035] During the second sub sensing period, the first control switch circuit may separate the two or more first touch electrodes from the two or more amplifiers and the two or more charge amplifiers, and the second control switch circuit may connect the two or more second touch electrodes to a specific charge amplifier.

[0036] Each of the two or more charge amplifiers may also include an operational amplifier including a first input node, a second input node, and an output node.

[0037] A feedback capacitor may be connected between the second input node and the output node.

[0038] Certain charge amplifiers may also include a capacitance-controlled switch and an additional feedback capacitor connected between the second input node and the output node.

[0039] A touch drive circuit according to an example embodiment of the present disclosure may include: a first signal input unit configured to receive a reference touch drive signal and a touch mode control signal; and a first signal output unit configured to output a first touch drive signal having a first amplitude or a second touch drive signal having a second amplitude different from the first amplitude to the touch sensor based on the reference touch drive signal and the touch mode control signal.

[0040] The touch mode control signal may have a first level voltage or a second level voltage.

[0041] If the touch mode control signal has a first level voltage, a first touch driving signal may be applied to N touch electrodes among a plurality of touch electrodes included in the touch sensor at one point in time.

[0042] If the touch mode control signal has the second level voltage, the second touch driving signal may be simultaneously applied to M touch electrodes greater than N among the plurality of touch electrodes included in the touch sensor at one point in time.

[0043] According to an example embodiment of the present disclosure, a touch controller for controlling a touch sensing operation of a touch display device may include a second signal input unit and a second signal output unit, the second signal input unit being configured to receive a first mode control signal from a display controller, and the second signal output unit being configured to output a reference touch drive signal and output a second mode control signal generated based on the first mode control signal.

[0044] The first mode control signal may include a first signal portion having a first level voltage and a second signal portion having a second level voltage different from the first level voltage.

[0045] If the first mode control signal is the second signal portion having the second level voltage, the second mode control signal may have a third level voltage.

[0046] If the first mode control signal is a first signal portion having a first level voltage, the second mode control signal may include a signal portion having a third level voltage and a signal portion having a fourth level voltage different from the third level voltage.

[0047] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller capable of supporting a variety of touch sensing modes may be provided.

[0048] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller capable of efficiently sensing a contact touch and a floating touch may be provided.

[0049] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller having a control structure and a circuit structure capable of efficiently sensing a contact touch and a floating touch may be provided.

[0050] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller having a control signal system capable of efficiently supporting a display mode, a contact touch sensing mode, and a floating touch sensing mode may be provided.

[0051] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller capable of low-power operation by efficiently performing display driving, contact touch sensing, and floating touch sensing in terms of driving time may be provided.

[0052] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and other aspects, features and other advantages of the present disclosure will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which:

[0054] Figure 1 is a system configuration diagram of a display device according to an example embodiment of the present disclosure.

[0055] Figure 2 A touch sensor of a touch display device according to an example embodiment of the present disclosure is shown.

[0056] Figure 3 A touch sensing system of a touch display device according to an example embodiment of the present disclosure is shown.

[0057] Figure 4 A driving timing diagram of a touch display device according to an example embodiment of the present disclosure is shown.

[0058] Figure 5 An operation mode definition table of a touch display device according to an example embodiment of the present disclosure is shown.

[0059] Figure 6 A touch driving circuit according to an example embodiment of the present disclosure is shown.

[0060] Figure 7 A charge amplifier in a touch driving circuit according to an example embodiment of the present disclosure is shown.

[0061] Figure 8 is a flowchart of an operating method of a touch display device according to an exemplary embodiment of the present disclosure.

[0062] Fig.9A and Fig. 9B is a diagram illustrating a driving situation when an operation period of a touch display device according to an exemplary embodiment of the present disclosure is a first touch sensing mode period.

[0063] Fig. 10A and Fig. 10B is a diagram illustrating a driving situation when an operation period of a touch display device according to an exemplary embodiment of the present disclosure is a first sub-sensing period within a second touch sensing mode period.

[0064] Fig.11A and Fig. 11B is a diagram illustrating a driving situation when an operation period of a touch display device according to an exemplary embodiment of the present disclosure is a second sub-sensing period within a second touch sensing mode period.

[0065] Fig.12 , Fig.13 and Fig.14 is a diagram briefly illustrating an operation of a touch driving circuit during a touch sensing mode period according to an example embodiment of the present disclosure.

[0066] Fig.15 A plurality of channel bonding group areas included in a touch sensor according to an example embodiment of the present disclosure are illustrated.

[0067] Fig.16 A touch driving circuit according to an example embodiment of the present disclosure is shown.

[0068] Fig.17 A touch driving circuit during a first touch sensing mode period according to an example embodiment of the present disclosure is shown.

[0069] Fig.18 A touch driving circuit during a first sub-sensing period of a second touch sensing mode period according to an example embodiment of the present disclosure is shown.

[0070] Fig.19 A touch driving circuit during a second sub-sensing period within a second touch sensing mode period according to an example embodiment of the present disclosure is shown.

[0071] Throughout the drawings and detailed description, unless otherwise described, the same drawing reference numerals should be understood to refer to the same elements, features, and structures. The relative sizes and depictions of these elements may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0072] Hereinafter, the example embodiments of the present disclosure are described in detail with reference to the accompanying drawings. When the reference numerals are assigned to the components of each of the accompanying drawings, the same components may be assigned the same reference numerals, even if they are shown in different accompanying drawings. When it is determined that the subject matter of the present disclosure is unclear, the details of known technologies or functions may be skipped. As used herein, when a component "comprises" another component, "has" another component, or "is composed of another component", unless the other component "only" comprises another component, has another component, or is composed of another component, the component may add other components. As used herein, the singular forms "a", "an", and "the" are intended to also include plural forms, unless the context clearly indicates otherwise.

[0073] The shapes, sizes, dimensions (e.g., length, width, height, thickness, radius, diameter, area, etc.), ratios, angles, quantities, etc. of the elements shown in the drawings for describing the example embodiments of the present disclosure are only 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, the detailed explanation of known related art may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure. Terms such as "comprising", "having", "including", "containing", "constituting", "made of", "formed of", "composed of" used herein are generally intended to allow the addition of other components unless these terms are used together with the term "only".

[0074] The dimensions including size and thickness of the various components shown in the drawings are shown for ease of description, and the present disclosure is not limited to the size and thickness of the components shown, but it should be noted that the relative dimensions including relative size, position and thickness of the components shown in the various drawings submitted herein are part of the present disclosure.

[0075] Even if not explicitly stated, the components are interpreted as including the ordinary error range.

[0076] When terms such as "on", "over", "above", "below", "below", "beside", "under", "near", "near", "adjacent", "on the side of", "close to" are used to describe the positional relationship between two parts, one or more parts may be located between the two parts unless such terms are used together with the terms "immediately" or "directly".

[0077] Spatially relative terms, such as "below," "below," "under," "lower," "above," "upper," etc., may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures. It should be understood that, in addition to the orientation shown in the figures, spatially relative terms may also include different orientations of elements in use or operation. For example, if the elements in the figures are inverted, elements described as being "below" or "below" other elements or features will be oriented as being "above" other elements or features. Therefore, the exemplary term "below" may include orientations below and above. Similarly, the exemplary terms "above" or "above" may include orientations "above" and "below."

[0078] When describing a temporal relationship, terms such as "after", "subsequently", "next", "following", "before", etc. may include any situation where two events are not consecutive, unless terms such as "immediately", "directly" or "directly" are explicitly used.

[0079] When an element or layer is disposed “on” another element or layer, the further layer or element may be directly interposed on the other element or between the two elements or layers.

[0080] Indications such as "first," "second," "A," "B," "(a)," and "(b)" may be used to describe components of the present disclosure. These indications are provided only to distinguish a component from another component, and the nature, order, or number of the components is not limited by the indications.

[0081] In addition, when describing the components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used herein. Each of these terms is not used to limit the nature, order or sequence of the corresponding components, but is only used to distinguish the corresponding components from other components. In the case of describing that a certain structural element or layer is "connected", "coupled", "bonded" or "joined" to another structural element or layer, it is generally interpreted that the other structural element or layer can be directly or indirectly "connected", "coupled", "bonded" or "joined" to the structural element or layer.

[0082] It should be understood that the term "at least one" includes all combinations related to any one item. For example, "at least one of a first element, a second element, and a third element" may include all combinations of two or more elements selected from the first element, the second element, and the third element, as well as each element of the first element, the second element, and the third element.

[0083] The term "device" as used herein may refer to a display device including a display panel and a driver for driving the display panel. Examples of display devices may include light emitting elements, etc. In addition, examples of devices may include laptop computers, televisions, computer monitors, automotive devices, wearable devices, and automotive equipment devices, as well as complete electronic devices (or devices) or complete sets of devices (or devices) that include light emitting elements, etc. as complete products or final products, for example, mobile electronic devices such as smart phones or electronic tablets, but embodiments of the present disclosure are not limited thereto.

[0084] Like reference numerals generally refer to like elements throughout the specification.

[0085] When describing the positional relationship between components, when two or more components are described as being "connected," "coupled," or "linked," the two or more components may be directly "connected," "coupled," or "linked," or another component may be interposed. Here, other components may be included in one or more of the two or more components that are "connected," "coupled," or "linked" to each other.

[0086] When terms such as "after", "next", "then" and "before" are used to describe a time flow relationship related to components, methods of operation and methods of manufacture, they may include a non-sequential relationship unless the terms "immediately" or "directly" are used.

[0087] When a component is assigned a value or its corresponding information (eg, a level), the value or the corresponding information may be interpreted as including tolerances that may occur due to various factors (eg, process factors, internal or external influences, or noise).

[0088] Features of various example embodiments of the present disclosure may be partially or completely attached or combined with each other and may be technically interlocked and operated in various ways, and the example embodiments may be performed independently or in association with each other.

[0089] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the example embodiments belong. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such in this article.

[0090] Hereinafter, various exemplary embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

[0091] Figure 1 is a system configuration diagram of a display device according to an example embodiment of the present disclosure.

[0092] refer to Figure 1 , a display device according to an example embodiment of the present disclosure may include a display panel 110 and a display driving circuit as components for displaying an image.

[0093] The display driving circuit may be a circuit for driving the display panel 110 , and may include a data driving circuit 120 and a gate driving circuit 130 , and may further include a display controller 140 .

[0094] The display panel 110 may include a display area DA that displays an image and a non-display area NDA that does not display an image. The non-display area NDA may be an external area of ​​the display area DA, and may also be referred to as a frame area. The non-display area NDA may be an area adjacent to the display area DA. Further, the non-display area NDA may be an area disposed adjacent to the display area DA and configured to completely or partially surround the display area DA. However, the present disclosure is not limited thereto. All or part of the non-display area NDA may be an area visible from the front of the touch display device 100, or may be an area that is bent and not visible from the front of the touch display device 100.

[0095] The display panel 110 may include a plurality of sub-pixels SP and various types of signal lines for driving the plurality of sub-pixels SP.

[0096] The various types of signal lines may include a plurality of data lines DL transmitting data signals (also referred to as data voltages or image signals) and a plurality of gate lines GL transmitting gate signals (also referred to as scan signals).

[0097] The plurality of data lines DL and the plurality of gate lines GL may cross each other. Each of the plurality of gate lines GL may be arranged while extending in a first direction. Each of the plurality of data lines DL may be arranged while extending in a second direction. Here, the first direction may be a row direction, and the second direction may be a column direction. Alternatively, the first direction may be a column direction, and the second direction may be a row direction.

[0098] The data driving circuit 120 is a circuit for driving a plurality of data lines DL and may output data signals to the plurality of data lines DL. The gate driving circuit 130 is a circuit for driving a plurality of gate lines GL and may output gate signals to the plurality of gate lines GL.

[0099] The display controller 140 may receive input data FDATA and a display drive control signal DDCS from the host system 180. For example, the display drive control signal DDCS may include a vertical synchronization signal VSYNC, a horizontal synchronization signal HSYNC, and a data enable signal DE. Here, the horizontal synchronization signal is a signal indicating the time taken to display one horizontal line of a picture, and the vertical synchronization signal is a signal indicating the time taken to display one frame of a picture. The data enable signal may correspond to a signal indicating a period of supplying a data voltage to a pixel.

[0100] The display controller 140 may supply image data DATA to the data driving circuit 120 based on the input data FDATA. In addition, the display controller 140 may be a device for controlling the data driving circuit 120 and the gate driving circuit 130, and may control the driving timing of the plurality of data lines DL and the driving timing of the plurality of gate lines GL. The display controller 140 may supply a data driving control signal DCS to the data driving circuit 120 to control the data driving circuit 120, and may supply a gate driving control signal GCS to the gate driving circuit 130 to control the gate driving circuit 130.

[0101] The data driving circuit 120 may supply data signals to the plurality of data lines DL according to the driving timing control of the display controller 140. The data driving circuit 120 may receive image data DATA in a digital form from the display controller 140, convert the received image data DATA into a data signal in an analog form, and output the converted image data to the plurality of data lines DL.

[0102] The gate drive circuit 130 may supply a gate signal to the plurality of gate lines GL according to the timing control of the display controller 140. The gate drive circuit 130 may receive a first gate voltage corresponding to an on-level voltage and a second gate voltage corresponding to an off-level voltage and various gate drive control signals GCS, generate a gate signal, and supply the generated gate signal to the plurality of gate lines GL. For example, the first gate voltage may be a voltage higher than the second gate voltage. Alternatively, the second gate voltage may be a voltage higher than the first gate voltage.

[0103] For example, the data driving circuit 120 may be connected to the display panel 110 by a tape automated bonding (TAB) method, or may be connected to a bonding pad of the display panel 110 by a chip on glass (COG) or chip on board (COP) method, or may be connected to the display panel 110 by being implemented as a chip on film (COF) method.

[0104] For example, the gate drive circuit 130 may be connected to the display panel 110 using a tape automated bonding (TAB) method, or may be connected to a bonding pad of the display panel 110 using a chip on glass (COG) or chip on board (COP) method, or may be connected to the display panel 110 according to a chip on film (COF) method. Alternatively, the gate drive circuit 130 may be a gate in panel (GIP) type, and may be formed in a non-display area NDA of the display panel 110. The gate drive circuit 130 may be disposed on or connected to the substrate SUB. For example, if the gate drive circuit 130 is a GIP type, it may be disposed in a non-display area NDA of the substrate SUB. The gate drive circuit 130 may be connected to the substrate SUB in the case of a chip on glass (COG) type, a chip on film (COF) type, or the like.

[0105] In addition, at least one of the data driving circuit 120 and the gate driving circuit 130 may be disposed in the display area DA. For example, at least one of the data driving circuit 120 and the gate driving circuit 130 may be disposed not to overlap with the subpixel SP, or may be disposed to partially or completely overlap with the subpixel SP.

[0106] The data driving circuit 120 may be connected to one side of the display panel 110 , may be connected to one side and the other side of the display panel 110 , or may be connected along one side of the display panel 110 , according to a driving method, a panel design method, and a panel shape.

[0107] The gate driving circuit 130 may be connected to one side of the display panel 110 , may be connected to one side and the other side of the display panel 110 , or may be connected along one side of the display panel 110 , depending on a driving method, a panel design method, and a panel shape.

[0108] The display controller 140 may be implemented as a separate component from the data driving circuit 120 , or may be implemented as an integrated circuit integrated with the data driving circuit 120 .

[0109] The display controller 140 may be a timing controller for a typical display technology, or may be a control device that can further perform other control functions including the timing controller, or may be a control device different from the timing controller, or may be a control device other than the timing controller, or may be a circuit within the control device. The display controller 140 may be implemented with various circuits or electronic components, such as an integrated circuit (IC), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a processor.

[0110] The display controller 140 may be mounted on a printed circuit board, a flexible printed circuit, etc., and may be electrically connected to the data driving circuit 120 and the gate driving circuit 130 through the printed circuit board, the flexible printed circuit, etc.

[0111] The display controller 140 may transmit and receive signals with the data driving circuit 120 according to one or more predetermined interfaces. For example, the interface may include a low voltage differential signaling (LVDS) interface, an embedded clock interface (EPI) interface, or a serial peripheral interface (SPI).

[0112] The touch display device 100 may be a liquid crystal display device, or may be a self-luminous display device in which the display panel 110 emits light itself. In other words, the display panel 110 may be a liquid crystal display panel or a self-luminous display panel.

[0113] Furthermore, the touch display device 100 according to an example embodiment of the present disclosure may include a touch sensor and a touch sensing circuit 150 in order to provide a touch sensing function in addition to an image display function.

[0114] The touch sensing circuit 150 may detect whether a touch (eg, finger touch, pen touch) has occurred by a touch object such as a finger or a pen, or may detect a touch position by sensing the touch panel.

[0115] The touch sensing circuit 150 may include a touch driving circuit 160 for driving and sensing the touch sensor to generate and output touch sensing data, and a touch controller 170 for detecting a touch occurrence or detecting a touch position using the touch sensing data.

[0116] The touch sensor may include a plurality of touch electrodes. The plurality of touch electrodes may be electrically connected to the touch drive circuit 160 through a plurality of touch lines. Figure 2 The touch sensor is described in more detail.

[0117] The touch driving circuit 160 and the touch controller 170 included in the touch sensing circuit 150 may be implemented as separate devices or as one device. In addition, the touch driving circuit 160 and the data driving circuit 120 may be implemented as separate devices or as one device.

[0118] For example, the touch driving circuit 160 may be implemented as a readout integrated circuit (ROIC). Alternatively, the touch driving circuit 160 and the data driving circuit 120 may be integrated and implemented as a source and readout integrated circuit (SRIC). The touch controller 170 may be implemented as a micro control unit (MCU).

[0119] The touch display device 100 may further include a power supply circuit for supplying various types of power to the display driving circuit and / or the touch sensing circuit 150 .

[0120] The touch display device 100 according to an example embodiment of the present disclosure may be a mobile terminal such as a smartphone or tablet, or may be a monitor or television (TV) of various sizes, but is not limited thereto, and may be a display of various types and sizes capable of displaying information or images.

[0121] Alternatively, the touch display device 100 according to an example embodiment of the present disclosure may be a wearable device that can be worn on a body, such as a smart watch.

[0122] Figure 2 A touch sensor TS of a touch display device 100 according to an example embodiment of the present disclosure is shown.

[0123] refer to Figure 2 , the touch driving circuit 160 may sense the touch sensor TS to generate touch sensing data as a sensing result and provide the touch sensing data to the touch controller 170 .

[0124] refer to Figure 2 , the touch sensor TS may include a plurality of touch electrodes TE. The plurality of touch electrodes TE may be electrically connected to the touch driving circuit 160 through a plurality of touch lines TL.

[0125] refer to Figure 2 , the plurality of touch electrodes TE may include a plurality of first touch electrodes TE1 and a plurality of second touch electrodes TE2. For example, the plurality of first touch electrodes TE1 and the plurality of second touch electrodes TE2 may cross each other. Each of the plurality of first touch electrodes TE1 may extend in the first direction, and each of the plurality of second touch electrodes TE2 may extend in the second direction. Therefore, each of the plurality of first touch electrodes TE1 may overlap with the plurality of second touch electrodes TE2.

[0126] refer to Figure 2 , the plurality of first touch electrodes TE1 may be electrically connected to the touch driving circuit 160 through the plurality of first touch lines TL1, and the plurality of second touch electrodes TE2 may be electrically connected to the touch driving circuit 160 through the plurality of second touch lines TL2. For example, the touch driving circuit 160 may sense the touch sensors TS through the plurality of first touch lines TL1 and the plurality of second touch lines TL2 to generate touch sensing data as a sensing result and provide the touch sensing data to the touch controller 170.

[0127] The touch sensor TS may be implemented as a touch panel, and may exist alone outside the display panel 110 or may exist inside the display panel 110 .

[0128] The external touch sensor TS existing outside the display panel 110 may be manufactured separately from the display panel 110 and then combined with the display panel 110 during an assembly process. The external touch sensor may be implemented as a touch panel including a substrate and a plurality of touch electrodes on the substrate.

[0129] The embedded touch sensor or built-in touch sensor TS existing in the display panel 110 may be formed together with electrodes and lines related to display driving during the manufacturing process of the display panel 110. Hereinafter, for convenience of explanation, it is assumed that the touch sensor TS is the built-in touch sensor TS existing inside the display panel 110.

[0130] The touch driving circuit 160 may supply a touch driving signal to at least one touch electrode among the plurality of touch electrodes TE included in the touch sensor TS, and may sense at least one touch electrode among the plurality of touch electrodes to generate touch sensing data. Here, the touch driving signal may be a signal whose voltage level varies or fluctuates.

[0131] The touch sensing circuit 150 may sense a touch using a mutual capacitance sensing method or a self capacitance sensing method.

[0132] In the case where the touch sensing circuit 150 performs touch sensing in a mutual capacitance sensing method, the touch sensing circuit 150 may perform touch sensing based on the capacitance between the first touch electrode TE1 and the second touch electrode TE2 .

[0133] According to the mutual capacitance sensing method, the plurality of touch electrodes TE may be divided into driving touch electrodes (also referred to as transmitting touch electrodes) and sensing touch electrodes (also referred to as receiving touch electrodes). The touch driving circuit 160 may drive the driving touch electrodes and sense the sensing touch electrodes. Hereinafter, mutual capacitance sensing may also be referred to as "mutual sensing".

[0134] For example, during mutual sensing, the plurality of first touch electrodes TE1 may be driving touch electrodes (e.g., transmitting touch electrodes), and the plurality of second touch electrodes TE2 may be sensing touch electrodes (e.g., receiving touch electrodes). For another example, during mutual sensing, the plurality of first touch electrodes TE1 may be sensing touch electrodes (e.g., receiving touch electrodes), and the plurality of second touch electrodes TE2 may be driving touch electrodes (e.g., transmitting touch electrodes). Hereinafter, for ease of explanation, a case is illustrated in which the plurality of first touch electrodes TE1 are driving touch electrodes (e.g., transmitting touch electrodes) and the plurality of second touch electrodes TE2 are sensing touch electrodes (e.g., receiving touch electrodes).

[0135] If the touch sensing circuit 150 performs touch sensing in a self-capacitance sensing method, the touch sensing circuit 150 may perform touch sensing based on capacitance between each touch electrode TE and a touch object (eg, a finger, a pen, etc.).

[0136] According to the self-capacitance sensing method, each of the plurality of touch electrodes TE can be used as a driving touch electrode and a sensing touch electrode. The touch driving circuit 160 can drive all or part of the plurality of touch electrodes TE and sense all or part of the plurality of touch electrodes TE. In the following, self-capacitance sensing may also be referred to as "self-sensing".

[0137] For example, in self-sensing, the touch driving circuit 160 may supply a touch driving signal to at least one first touch electrode TE1 among the plurality of first touch electrodes TE1, and sense the at least one first touch electrode TE1 supplied with the touch driving signal. The touch driving circuit 160 may supply a touch driving signal to at least one second touch electrode TE2 among the plurality of second touch electrodes TE2, and sense the at least one second touch electrode TE2 supplied with the touch driving signal.

[0138] refer to Figure 2 , the first touch line TL1 may be connected to each of the plurality of first touch electrodes TE1. Alternatively, two first touch lines TL1 may be connected to each of the plurality of first touch electrodes TE1. In this case, the first touch line TL1 may be connected to each of one end and the other end of one first touch electrode TE1.

[0139] The second touch line TL2 may be connected to each of the plurality of second touch electrodes TE2. Alternatively, two second touch lines TL2 may be connected to each of the plurality of second touch electrodes TE2. In this case, the second touch line TL2 may be connected to each of one end and the other end of one second touch electrode TE2.

[0140] As an example, each of the plurality of first touch electrodes TE1 and the plurality of second touch electrodes TE2 may be in a stripe shape.

[0141] As another example, each of the plurality of first touch electrodes TE1 and the plurality of second touch electrodes TE2 may be configured with a plurality of sub-electrodes electrically connected to each other through a bridge electrode.

[0142] As another example, each of the plurality of first touch electrodes TE1 may be integrally formed, and each of the plurality of second touch electrodes TE2 may be configured with a plurality of sub-electrodes electrically connected to each other through a bridge electrode.

[0143] As another example, each of the plurality of second touch electrodes TE2 may be integrally formed, and each of the plurality of first touch electrodes TE1 may be formed of a plurality of sub-electrodes electrically connected to each other through a bridge electrode.

[0144] For example, a plurality of first touch electrodes TE1 may be provided in the first sensor metal layer, and a plurality of second touch electrodes TE2 may be provided in the second sensor metal layer. Here, a sensor interlayer insulating film may be provided between the first sensor metal layer and the second sensor metal layer.

[0145] As another example, if each of the plurality of first touch electrodes TE1 is integrally formed, and each of the plurality of second touch electrodes TE2 is composed of a plurality of sub-electrodes electrically connected to each other through a bridging electrode, the plurality of first touch electrodes TE1 and the plurality of sub-electrodes may be provided in a sensor metal layer, and a bridging electrode electrically connecting the plurality of sub-electrodes may be provided in the bridging metal layer. Here, a sensor interlayer insulating film may be provided between the sensor metal layer and the bridging metal layer.

[0146] As another example, if each of the plurality of second touch electrodes TE2 is integrally formed and each of the plurality of first touch electrodes TE1 is formed of a plurality of sub-electrodes electrically connected to each other through a bridging electrode, the plurality of second touch electrodes TE2 and the plurality of sub-electrodes may be provided in a sensor metal layer, and a bridging electrode electrically connecting the plurality of sub-electrodes may be provided in the bridging metal layer. Here, a sensor interlayer insulating film may be provided between the sensor metal layer and the bridging metal layer.

[0147] Figure 3 A touch sensing system of a touch display device 100 according to an example embodiment of the present disclosure is shown.

[0148] The touch display device 100 according to an example embodiment of the present disclosure may include a touch sensor TS, a touch driving circuit 160 , a touch controller 170 , and a display controller 140 .

[0149] The touch drive circuit 160 may drive the touch sensor TS by supplying a touch drive signal TDS to the touch sensor TS, and may sense the touch sensor TS. Sensing the touch sensor TS by the touch drive circuit 160 may mean sensing the capacitance between the touch electrodes TE or sensing the capacitance of the touch electrode TE. For example, sensing the touch sensor TS by the touch drive circuit 160 may mean sensing the mutual capacitance between the touch electrodes TE or sensing the self capacitance of the touch electrode TE.

[0150] The touch controller 170 may supply a reference touch drive signal TDS_REF to the touch drive circuit 160. The reference touch drive signal TDS_REF may be a signal whose voltage level varies or fluctuates. The reference touch drive signal TDS_REF may be a signal having a reference amplitude ΔV0. For example, the reference touch drive signal TDS_REF may be a square wave, a sine wave, a triangle wave, etc. For example, the reference touch drive signal TDS_REF may be a pulse width modulation (PWM) signal.

[0151] The touch driving circuit 160 may generate a touch driving signal TDS to be supplied to the touch sensor TS using the reference touch driving signal TDS_REF.

[0152] The touch driving signal TDS may be one of a first touch driving signal TDS1 applied to the touch sensor TS during a first period (eg, a first touch sensing mode period) and a second touch driving signal TDS2 applied to the touch sensor TS during a second period (eg, a second touch sensing mode period).

[0153] The first touch drive signal TDS1 and the second touch drive signal TDS2 may be signals having a variable voltage level. The first touch drive signal TDS1 may be a signal having a first amplitude ΔV1, and the second touch drive signal TDS2 may be a signal having a second amplitude ΔV2. For example, the first touch drive signal TDS1 and the second touch drive signal TDS2 may be square waves, sine waves, triangle waves, etc. For example, the first touch drive signal TDS1 and the second touch drive signal TDS2 may be pulse width modulation (PWM) signals. The frequencies of the first touch drive signal TDS1 and the second touch drive signal TDS2 may be the same as the frequency of the reference touch drive signal TDS_REF.

[0154] The touch controller 170 may control the touch driving circuit 160. Specifically, the touch controller 170 may generate a second mode control signal MCS2 based on the first mode control signal MCS1 received from the display controller 140, and supply the second mode control signal MCS2 to the touch driving circuit 160, thereby controlling the operation timing of the touch driving circuit 160. Here, the second mode control signal MCS2 may also be referred to as a “touch mode control signal”.

[0155] The operation timing and operation type of the touch driving circuit 160 according to the exemplary embodiment of the present disclosure may be defined by a combination of the first mode control signal MCS1 and the second mode control signal MCS2. In addition, the operation timing and operation type of the touch display device 100 according to the exemplary embodiment of the present disclosure may be defined by a combination of the first mode control signal MCS1 and the second mode control signal MCS2.

[0156] Hereinafter, the touch driving circuit 160 and the touch controller 170 according to an exemplary embodiment of the present disclosure will be described again.

[0157] The touch drive circuit 160 according to an example embodiment of the present disclosure may include: a first signal input unit 310, configured to receive a reference touch drive signal; and a first signal output unit 320, configured to output a first touch drive signal TDS1 having a first amplitude ΔV1 or a second touch drive signal TDS2 having a second amplitude ΔV2 different from the first amplitude ΔV1 to the touch sensor TS based on the reference touch drive signal TDS_REF and the second mode control signal MCS2.

[0158] When the second mode control signal MCS2 has the first level voltage, the first signal output unit 320 may output the first touch driving signal TDS1 to the N touch electrodes TE. N is a natural number greater than or equal to 1.

[0159] When the second mode control signal MCS2 has the second level voltage, the first signal output unit 320 may output the second touch driving signal TDS2 to the M touch electrodes TE. Here, M may be a value greater than N.

[0160] In this case, the second mode control signal MCS2 may have a first level voltage or a second level voltage. If the second mode control signal MCS2 has a first level voltage, the first touch drive signal TDS1 may be applied to the N touch electrodes TE at one point in time. If the second mode control signal MCS2 has a second level voltage, the second touch drive signal TDS2 may be applied to M touch electrodes TE greater than N at one point in time.

[0161] The touch controller 170 according to an example embodiment of the present disclosure may be a control device for controlling a touch sensing operation of the touch display device 100 , and may include a second signal input unit 330 and a second signal output unit 340 .

[0162] The second signal input unit 330 may be configured to receive the first mode control signal MCS1 from the display controller 140 .

[0163] The second signal output unit 340 may be configured to output the reference touch driving signal TDS_REF, and may be configured to output the second mode control signal MCS2 generated based on the first mode control signal MCS1.

[0164] The first mode control signal MCS1 may include a first signal portion having a first level voltage and a second signal portion having a second level voltage different from the first level voltage. When the first mode control signal MCS1 includes a first signal portion having a first level voltage and a second signal portion having a second level voltage, respectively, the second mode control signal MCS2 may be configured to have different signal portions.

[0165] If the first mode control signal MCS1 is the second signal portion having the second level voltage, the second mode control signal MCS2 may have the third level voltage.

[0166] If the first mode control signal MCS1 is a first signal portion having a first level voltage, the second mode control signal MCS2 may include a signal portion having a third level voltage and a signal portion having a fourth level voltage different from the third level voltage.

[0167] Figure 4 shows a driving timing diagram of the touch display device 100 according to an exemplary embodiment of the present disclosure, and Figure 5 An operation mode definition table of the touch display device 100 according to an exemplary embodiment of the present disclosure is shown.

[0168] refer to Figure 4 and Figure 5 The touch display device 100 according to an exemplary embodiment of the present disclosure may have a plurality of operation modes. The plurality of operation modes may include a display mode for displaying an image and a touch sensing mode for sensing a touch.

[0169] The touch sensing mode may include a first touch sensing mode and a second touch sensing mode. The first touch sensing mode may be a contact touch sensing mode for sensing a contact touch, which is a touch that contacts the screen, and the second touch sensing mode may be a suspended touch sensing mode for sensing a suspended touch, which is a touch within a predetermined distance from the screen without contacting the screen.

[0170] In an example embodiment of the present disclosure, a suspended touch may also be referred to as a non-contact touch. In an example embodiment of the present disclosure, a suspended touch may mean an action of a user's body or a pen indicating to a specific point on the screen without the user contacting the screen, or may mean a gesture, such as a gesture or movement, of a user's body or a pen moving on or over the screen. For example, a suspended touch may mean a gesture, such as a gesture or movement, of a user's body or a pen moving on or over the screen without the user contacting the screen.

[0171] In an example embodiment of the present disclosure, sensing a suspended touch may mean detecting the position of a body or pen that is not in contact with the screen (ie, non-contact state), or detecting an operation of a body or pen that is not in contact with the screen (ie, non-contact state).

[0172] refer to Figure 4 and Figure 5 , the operation period of the touch display device 100 may include a display mode period Td and a touch sensing mode period Tt, and the touch sensing mode period Tt may include a first touch sensing mode period Tt1 and a second touch sensing mode period Tt2.

[0173] refer to Figure 4 and Figure 5 , the display mode period Td may be a period during which the touch display device 100 operates in the display mode, and the touch sensing mode period Tt may be a period during which the touch display device 100 operates in the touch sensing mode.

[0174] refer to Figure 4 and Figure 5 , the first touch sensing mode period Tt1 may be a period during which the touch display device 100 operates in the first touch sensing mode (e.g., contact touch sensing mode), and the second touch sensing mode period Tt2 may be a period during which the touch display device 100 operates in the second touch sensing mode (e.g., suspended touch sensing mode). However, the present disclosure is not limited thereto. For example, the first touch sensing mode period Tt1 may be a period during which the touch display device 100 operates in the first touch sensing mode (e.g., suspended touch sensing mode), and the second touch sensing mode period Tt2 may be a period during which the touch display device 100 operates in the second touch sensing mode (e.g., contact touch sensing mode).

[0175] During the touch sensing mode period Tt, the touch driving circuit 160 may supply a touch driving signal TDS to the touch sensor TS.

[0176] During the first touch sensing mode period Tt1, the touch driving circuit 160 may supply a first touch driving signal TDS1 to the touch sensor TS. Here, the first touch driving signal TDS1 may be a signal whose voltage level varies with time, and may have a first frequency and a first amplitude ΔV1.

[0177] During the second touch sensing mode period Tt2, the touch drive circuit 160 may supply a second touch drive signal TDS2 to the touch sensor TS. Here, the second touch drive signal TDS2 may be a signal whose voltage level varies with time, and may have a second frequency and a second amplitude ΔV2. The second frequency may be the same as or different from the first frequency. The second amplitude ΔV2 may be different from the first amplitude ΔV1.

[0178] The operation period of the touch display device ( 100 ) may also be referred to as the operation period of the display panel 110 .

[0179] refer to Figure 4 , since the second touch sensing mode period Tt2 is a suspended touch sensing mode period, the second amplitude ΔV2 of the second touch drive signal TDS2 may be greater than the first amplitude ΔV1 of the first touch drive signal TDS1 to improve the suspended touch sensing performance. For example, the second frequency of the second touch drive signal TDS2 may be the same as the first frequency of the first touch drive signal TDS1, and the second amplitude ΔV2 of the second touch drive signal TDS2 may be greater than the first amplitude ΔV1 of the first touch drive signal TDS1. Alternatively, the second frequency of the second touch drive signal TDS2 may be different from the first frequency of the first touch drive signal TDS1, and the second amplitude ΔV2 of the second touch drive signal TDS2 may be greater than the first amplitude ΔV1 of the first touch drive signal TDS1. However, the present disclosure is not limited thereto.

[0180] refer to Figure 4 During the first touch sensing mode period Tt1, the first touch driving signal TDS1 may be applied to the plurality of first touch electrodes TE1. For example, during the first touch sensing mode period Tt1, the first touch driving signal TDS1 may be sequentially applied to each of the plurality of first touch electrodes TE1.

[0181] refer to Figure 4 During the second touch sensing mode period Tt2, two or more first touch electrodes TE1 among the plurality of first touch electrodes TE1 may be electrically connected to operate as one large first touch electrode TE1. In addition, during the second touch sensing mode period Tt2, two or more second touch electrodes TE2 among the plurality of second touch electrodes TE2 may be electrically connected to operate as one large second touch electrode TE2.

[0182] refer to Figure 4 During the second touch sensing mode period Tt2, the second touch drive signal TDS2 may be simultaneously applied to two or more first touch electrodes TE1 electrically connected to each other among the plurality of first touch electrodes TE1, or the second touch drive signal TDS2 may be simultaneously applied to two or more second touch electrodes TE2 electrically connected to each other among the plurality of second touch electrodes TE2.

[0183] As described above, the touch display device 100 according to the exemplary embodiment of the present disclosure may further include a display driving circuit for driving a plurality of sub-pixels SP, a display controller 140 for controlling the display driving circuit and supplying a first mode control signal MCS1 to the touch controller 170, and a touch controller 170 for supplying a second mode control signal MCS2 to the touch driving circuit 160. Here, the display driving circuit may include a data driving circuit 120, a gate driving circuit 130, and the like.

[0184] refer to Figure 4 and Figure 5 , the display mode period Td, the first touch sensing mode period Tt1, and the second touch sensing mode period Tt2 may be distinguished or defined by the first mode control signal MCS1 and the second mode control signal MCS2.

[0185] The first mode control signal MCS1 may be a control signal for distinguishing between the display mode period Td and the touch sensing mode period Tt, and the second mode control signal MCS2 may be a control signal for distinguishing between the first touch sensing mode period Tt1 and the second touch sensing mode period Tt2.

[0186] refer to Figure 4 For example, the first mode control signal MCS1 may be a vertical synchronization signal VSYNC for dividing one display frame period into an active period and a blanking period. In the vertical synchronization signal VSYNC, the active period may be a display mode period Td, and the blanking period may be a touch sensing mode period Tt.

[0187] The vertical synchronization signal VSYNC may be one of the display driving control signals DDCS provided from the host system 180 to the display controller 140 .

[0188] The display controller 140 may provide the vertical synchronization signal VSYNC received from the host system 180 to the touch controller 170 as the first mode control signal MCS1 .

[0189] refer to Figure 4 , for example, the second mode control signal MCS2 may be a floating enable signal HOVER_EN for enabling a floating touch sensing mode as the second touch sensing mode.

[0190] refer to Figure 4 , the first mode control signal MCS1 may include a first signal portion S1 having a first level voltage LV1 and a second signal portion S2 having a second level voltage LV2 different from the first level voltage LV1.

[0191] The second mode control signal MCS2 may include a third signal portion S3 having a third level voltage LV3 and a fourth signal portion S4 having a fourth level voltage LV4 different from the third level voltage LV3 .

[0192] refer to Figure 4 , during the display mode period Td, the first mode control signal MCS1 may have the second level voltage LV2, and the second mode control signal MCS2 may have the third level voltage LV3.

[0193] refer to Figure 4 , during the first touch sensing mode period Tt1 , the first mode control signal MCS1 may have the first level voltage LV1 , and the second mode control signal MCS2 may have the third level voltage LV3 .

[0194] refer to Figure 4 , during the second touch sensing mode period Tt2 , the first mode control signal MCS1 may have the first level voltage LV1 , and the second mode control signal MCS2 may have the fourth level voltage LV4 .

[0195] A touch display device 100 according to an example embodiment of the present disclosure may include: a display panel 110, which includes a plurality of sub-pixels SP and a plurality of touch electrodes TE; a display driving circuit, which drives the plurality of sub-pixels SP; a touch driving circuit 160, which supplies a touch driving signal to at least one of the plurality of touch electrodes TE; a display controller 140, which controls the display driving circuit and provides a first mode control signal MCS1 to a touch controller 170; and a touch controller (170), which supplies a second mode control signal MCS2 to the touch driving circuit 160.

[0196] refer to Figure 4 and Figure 5 , the display mode period Td, the first touch sensing mode period Tt1 and the second touch sensing mode period Tt2 may be distinguished by the first mode control signal MCS1 and the second mode control signal MCS2.

[0197] Figure 6 A touch driving circuit 160 according to an example embodiment of the present disclosure is shown, and Figure 7 A charge amplifier CAMP in the touch driving circuit 160 according to an example embodiment of the present disclosure is shown.

[0198] refer to Figure 6 The touch driving circuit 160 according to an example embodiment of the present disclosure may further include a sensing unit block SUBLK for sensing the touch sensor TS. The sensing unit block SUBLK may include a plurality of sensing units SU.

[0199] refer to Figure 6 The touch driving circuit 160 according to an example embodiment of the present disclosure may further include a first switching circuit SWC1 , a second switching circuit SWC2 , and an analog-to-digital converter ADC.

[0200] refer to Figure 6 , the first switch circuit SWC1 may connect the touch electrode TE to be sensed among the plurality of touch electrodes TE included in the touch sensor TS to the sensing unit block SUBLK. The first switch circuit SWC1 may include a plurality of switches and may also be referred to as a multiplexer circuit.

[0201] refer to Figure 6 , the second switch circuit SWC2 may connect one sensing unit SU among a plurality of sensing units SU included in the sensing unit block SUBLK to the analog-to-digital converter ADC. The second switch circuit SWC2 may include a plurality of switches and may also be referred to as a multiplexer circuit.

[0202] refer to Figure 6 , each of the plurality of sensing units SU may include a charge amplifier CAMP, an integrator INTG, and a sample and hold circuit SHA.

[0203] refer to Figure 6 , the charge amplifier CAMP may be electrically connected to one or more touch electrodes TE selected by the first switch circuit SWC1 among the plurality of touch electrodes TE included in the touch sensor TS. For example, through the first switch circuit SWC1, the charge amplifier CAMP may be electrically connected to one or more touch electrodes TE among the plurality of touch electrodes TE included in the touch sensor TS.

[0204] The charge amplifier CAMP may receive a touch sensing signal from one or more touch electrodes TE selected as sensing targets among the plurality of connectable touch electrodes TE.

[0205] refer to Figure 6 , the first switch circuit SWC1 may connect the touch electrode TE as a sensing target among the plurality of connectable touch electrodes TE to the charge amplifier CAMP in the corresponding sensing unit SU among the plurality of sensing units SU. However, the present disclosure is not limited thereto.

[0206] Therefore, the charge amplifier CAMP in the corresponding sensing unit SU may receive a touch sensing signal from the touch electrode TE as a sensing target. That is, the charge amplifier CAMP in the corresponding sensing unit SU may detect a touch sensing signal from the touch electrode as a sensing target. Here, the touch sensing signal detected at the touch electrode TE may correspond to a capacitance (e.g., mutual capacitance or self capacitance) associated with the touch electrode TE.

[0207] refer to Figure 6 and Figure 7 , the charge amplifier CAMP may output an output signal VOUT corresponding to a touch sensing signal detected at the touch electrode TE.

[0208] refer to Figure 7 The charge amplifier CAMP may include an operational amplifier OP-AMP and a feedback capacitor Cfb between a second input node IN2 and an output node OUT. The operational amplifier OP-AMP includes a first input node IN1, a second input node IN2, and an output node OUT.

[0209] refer to Figure 7 , the first input node IN1 may be a node to which the input signal VIN is input. The second input node IN2 may be a node electrically connected to the touch electrode TE selected by the first switch circuit SWC1. The output node OUT may be a node connected to the integrator INTG, and may be a node to which the output signal VOUT is output.

[0210] refer to Figure 7 , a charge corresponding to the capacitance (e.g., self-capacitance or mutual capacitance) in the touch electrode TE may be charged in the feedback capacitor Cfb, and an output signal VOUT corresponding to the amount of charge charged in the feedback capacitor Cfb may be output. Here, the touch drive circuit 160 detecting the touch sensing signal from the touch electrode TE may mean that the touch drive circuit 160 detects the capacitance (e.g., self-capacitance or mutual capacitance) of the touch electrode TE, or may mean that the touch drive circuit 160 charges the amount of charge corresponding to the capacitance (e.g., self-capacitance or mutual capacitance) of the touch electrode TE in the feedback capacitor Cfb, and outputs an output signal VOUT corresponding to the charged amount of charge.

[0211] refer to Figure 7 The charge amplifier CAMP may further include a reset switch RST that controls the connection between the second input node IN2 and the output node OUT. For example, the reset switch RST may be disposed between the second input node IN2 and the output node OUT.

[0212] refer to Figure 6, the integrator INTG can output an integrated value of the output signal VOUT of the charge amplifier CAMP. Here, the charge amplifier CAMP and the integrator INTG can be implemented in an integrated manner.

[0213] The sample and hold circuit SHA may store the integrated value output from the integrator INTG until the next integrated value is output from the integrator INTG.

[0214] The second switch circuit SWC2 may connect one sensing unit SU among the plurality of sensing units SU included in the sensing unit block SUBLK to the analog-to-digital converter ADC.

[0215] The analog-to-digital converter ADC may convert an integrated value stored in a sample and hold circuit (SHA) in the sensing unit SU selected by the second switch circuit SWC2 into a digital value to generate touch sensing data.

[0216] The touch driving circuit 160 may transmit the touch sensing data generated by the analog-to-digital converter ADC to the touch controller 170. In this case, the touch sensing data may be transmitted in the form of a differential signal.

[0217] In addition, reference Figure 7 , the input signal (VIN) input to the first input node IN1 of the charge amplifier CAMP may be a signal whose voltage level does not change or a signal whose voltage level changes or swings.

[0218] The type of the input signal VIN may vary according to the sensing method.

[0219] More specifically, if touch sensing is performed in the mutual sensing method, the input signal VIN may be a reference voltage whose voltage level does not change or varies. If touch sensing is performed in the self-sensing method, the input signal VIN may be a second touch drive signal TDS2 whose voltage level changes.

[0220] The type of the input signal (VIN) may vary according to the type of the touch sensing mode.

[0221] More specifically, during the first touch sensing mode period Tt1, the input signal VIN may be a reference voltage whose voltage level does not change. During the second touch sensing mode period Tt2, the input signal VIN may be a second touch driving signal TDS2 whose voltage level changes.

[0222] Hereinafter, the circuit structure and operation during the first touch sensing mode period Tt1 and the second touch sensing mode period Tt2 will be described in more detail.

[0223] Figure 8is a flowchart of an operating method of a touch display device according to an exemplary embodiment of the present disclosure.

[0224] refer to Figure 8 According to an example embodiment of the present disclosure, the operating method of the touch display device 100 may include step S100 and step S200, in which the display driving circuit performs display driving for displaying an image through the display panel 110 during the display mode period Td, and in step S200, the touch sensing circuit 150 performs touch sensing during the touch sensing mode period Tt.

[0225] The touch sensing mode period Tt may include a first touch sensing mode period Tt1 and a second touch sensing mode period Tt2 which do not temporally overlap with each other.

[0226] During the first touch sensing mode period Tt1, there may be contact touch sensing performed in a mutual sensing manner. During the second touch sensing mode period Tt2, there may be floating touch sensing (ie, non-contact touch sensing) performed in a self-sensing manner.

[0227] refer to Figure 8 Step S200 may include step S210 and step S220. In step S210, the touch sensing circuit 150 senses contact touch in a mutual sensing manner during a first touch sensing mode period Tt1. In step S220, the touch sensing circuit 150 senses suspended touch (i.e., non-contact touch) in a self-sensing manner during a second touch sensing mode period Tt2.

[0228] The second touch sensing mode period Tt2 may include a first sub-sensing period Tt21 and a second sub-sensing period Tt22 which do not overlap each other. The first sub-sensing period Tt21 may be a period for sensing the plurality of first touch electrodes TE1 in a self-sensing manner, and the second sub-sensing period Tt22 may be a period for sensing the plurality of second touch electrodes TE2 in a self-sensing manner.

[0229] refer to Figure 8 Step S220 may include step S221 and step S222. In step S221, the touch sensing circuit 150 senses the plurality of first touch electrodes TE1 in a self-sensing manner during a first sub-sensing period Tt21. In step S222, the touch sensing circuit 150 senses the plurality of second touch electrodes TE2 in a self-sensing manner during a second sub-sensing period Tt22.

[0230] In step S221 , during the first sub sensing period Tt21 , the second touch driving signal TDS2 may be simultaneously applied to two or more first touch electrodes TE1 electrically connected to each other among the plurality of first touch electrodes TE1 .

[0231] In step S222 , during the second sub sensing period Tt22 , the second touch driving signal TDS2 may be simultaneously applied to two or more second touch electrodes TE2 that are electrically connected to each other among the plurality of second touch electrodes TE2 .

[0232] Fig.9A and Fig. 9B is a diagram showing a driving situation when an operation period of the touch display device 100 according to an exemplary embodiment of the present disclosure is a first touch sensing mode period Tt1 .

[0233] refer to Fig.9A and Fig. 9B , during the first touch sensing mode period Tt1, there may be an operation performed for sensing a contact touch in a mutual sensing manner.

[0234] refer to Fig.9A and Fig. 9B During the first touch sensing mode period Tt1 , the touch driving circuit 160 may apply a first touch driving signal TDS1 having a first amplitude ΔV1 to at least one of the plurality of first touch electrodes TE1 .

[0235] For example, during the first touch sensing mode period Tt1, the first touch driving signal TDS1 may be sequentially applied to the plurality of first touch electrodes TE1. That is, at any time point during the first touch sensing mode period Tt1, the first touch driving signal TDS1 may be applied to one first touch electrode TE1.

[0236] For another example, during the first touch sensing mode period Tt1, the plurality of first touch electrodes TE1 may be grouped into a plurality of first touch electrode groups. Each of the plurality of first touch electrode groups may include two or more first touch electrodes TE1. During the first touch sensing mode period Tt1, the first touch drive signal TDS1 may be applied to the plurality of first touch electrode groups in sequence. That is, at any time point during the first touch sensing mode period Tt1, the first touch drive signal TDS1 may be simultaneously applied to two or more first touch electrodes TE1 included in one first touch electrode group. Therefore, if the first touch drive signal TDS1 is simultaneously applied to two or more first touch electrodes TE1 included in one first touch electrode group during the first touch sensing mode period Tt1, the first touch drive signal TDS1 applied to at least one of the two or more first touch electrodes TE1 and the first touch drive signal TDS1 applied to the remaining first touch electrodes TE1 may have a phase difference. For example, during the first touch sensing mode period Tt1, the first touch driving signal TDS1 applied to at least one of the two or more first touch electrodes TE1 and the first touch driving signal TDS1 applied to the remaining first touch electrodes TE1 may have an anti-phase relationship (ie, a 180 degree phase difference). However, the present disclosure is not limited thereto.

[0237] refer to Fig.9A and Fig. 9B During the first touch sensing mode period Tt1, a reference voltage VREF in the form of a direct current (DC) voltage whose voltage level does not change may be input to the first input node IN1 of the charge amplifier CAMP in the touch driving circuit 160.

[0238] refer to Fig.9A and Fig. 9B During the first touch sensing mode period Tt1, the second input node IN2 of the charge amplifier CAMP in the touch driving circuit 160 may be electrically connected to at least one second touch electrode TE2 of the plurality of second touch electrodes TE2.

[0239] refer to Fig.9A and Fig. 9B During the first touch sensing mode period Tt1, a mutual capacitance Cm may be formed between the first touch electrode TE1 and the second touch electrode TE2. Fig. 9B, the feedback capacitor Cfb may be provided between the second input node IN2 and the output node OUT of the charge amplifier CAMP, and the charge corresponding to the mutual capacitance Cm between the first touch electrode TE1 and the second touch electrode TE2 may be charged in the feedback capacitor Cfb of the charge amplifier CAMP. An output voltage (output signal) VOUT corresponding to the amount of charge charged in the feedback capacitor Cfb may be output to the output node OUT of the charge amplifier CAMP.

[0240] Fig. 10A and Fig. 10B is a diagram showing a driving situation when the operation period of the touch display device 100 according to an exemplary embodiment of the present disclosure is the first sub-sensing period Tt21 within the second touch sensing mode period Tt2 .

[0241] Fig.11A and Fig. 11B is a diagram showing a driving situation when the operation period of the touch display device 100 according to an exemplary embodiment of the present disclosure is the second sub sensing period Tt22 within the second touch sensing mode period Tt2 .

[0242] refer to Fig. 10A , Fig. 10B , Fig.11A and Fig. 11B During the second touch sensing mode period Tt2, there may be an operation performed for sensing a suspended touch in a self-sensing manner.

[0243] refer to Fig. 10A , Fig. 10B , Fig.11A and Fig. 11B During the second touch sensing mode period Tt2, the first sub sensing period Tt21 may be performed first, and then the second sub sensing period Tt22 may be performed. Alternatively, during the second touch sensing mode period Tt2, the second sub sensing period Tt22 may be performed first, and then the first sub sensing period Tt21 may be performed.

[0244] refer to Fig. 10A and Fig. 10B During the first sub sensing period Tt21, the plurality of second touch electrodes TE2 may be in an electrically floating state. That is, during the first sub sensing period Tt21, the plurality of second touch electrodes TE2 may be in a state where no electrical signal or voltage is applied.

[0245] refer to Fig. 10A and Fig. 10B, during the first sub-sensing period Tt21, the second touch drive signal TDS2 having a variable voltage level may be input to the first input node IN1 of the charge amplifier CAMP in the touch drive circuit 160. The second touch drive signal TDS2 may have a second amplitude ΔV2 greater than the first amplitude ΔV1. For example, the second frequency of the second touch drive signal TDS2 may be the same as the first frequency of the first touch drive signal TDS1, and the second amplitude ΔV2 of the second touch drive signal TDS2 may be greater than the first amplitude ΔV1 of the first touch drive signal TDS1. Alternatively, the second frequency of the second touch drive signal TDS2 may be different from the first frequency of the first touch drive signal TDS1, and the second amplitude ΔV2 of the second touch drive signal TDS2 may be greater than the first amplitude ΔV1 of the first touch drive signal TDS1. However, the present disclosure is not limited thereto.

[0246] refer to Fig. 10A and Fig. 10B During the first sub sensing period Tt21, the second input node IN2 of the charge amplifier CAMP in the touch driving circuit 160 may be electrically connected to at least one first touch electrode TE1 among the plurality of first touch electrodes TE1.

[0247] Therefore, the second touch driving signal TDS2 input to the first input node IN1 of the charge amplifier CAMP may be applied to at least one first touch electrode TE1 connected to the second input node IN2 of the charge amplifier CAMP.

[0248] refer to Fig. 10A and Fig. 10B , during the first sub sensing period Tt21, a self capacitance Cs may be formed in the first touch electrode TE1. Charges corresponding to the self capacitance Cs formed on the first touch electrode TE1 may be charged to the feedback capacitor (Cfb) of the charge amplifier CAMP. An output voltage VOUT corresponding to the amount of charge charged to the feedback capacitor Cfb may be output to the output node OUT of the charge amplifier CAMP.

[0249] refer to Fig.11A and Fig. 11B During the second sub sensing period Tt22, the plurality of first touch electrodes TE1 may be in an electrically floating state. That is, during the second sub sensing period Tt22, the plurality of first touch electrodes TE1 may be in a state where no electrical signal or voltage is applied.

[0250] refer to Fig.11A and Fig. 11B During the second sub sensing period Tt22 , the second touch drive signal TDS2 may be input to the first input node IN1 of the charge amplifier CAMP in the touch drive circuit 160 .

[0251] refer to Fig.11A and Fig. 11B During the second sub sensing period Tt22, the second input node IN2 of the charge amplifier CAMP in the touch drive circuit 160 may be electrically connected to at least one second touch electrode TE2 among the plurality of second touch electrodes TE2. For example, during the second sub sensing period Tt22, the second input node IN2 of the charge amplifier CAMP in the touch drive circuit 160 may be electrically connected to two or more second touch electrodes TE2 among the plurality of second touch electrodes TE2.

[0252] Therefore, the second touch driving signal TDS2 input to the first input node IN1 of the charge amplifier CAMP may be applied to at least one second touch electrode TE2 connected to the second input node IN2 of the charge amplifier CAMP.

[0253] refer to Fig.11A and Fig. 11B During the second sub-sensing period Tt22, a self-capacitance Cs may be formed in the second touch electrode TE2. Charges corresponding to the self-capacitance Cs formed on the second touch electrode TE2 may be charged to the feedback capacitor Cfb of the charge amplifier CAMP. An output voltage VOUT corresponding to the amount of charge charged to the feedback capacitor Cfb may be output to the output node OUT of the charge amplifier CAMP.

[0254] Fig.12 , Fig.13 and Fig.14 is a diagram briefly illustrating an operation of the touch driving circuit 160 during a touch sensing mode period Tt according to an example embodiment of the present disclosure.

[0255] refer to Fig.12 , Fig.13 and Fig.14 The touch driving circuit 160 may include an amplifier AMP, a charge amplifier CAMP, a first control switch circuit CSC1 and a second control switch circuit CSC2.

[0256] The amplifier AMP may be configured to output a first touch driving signal TDS1 .

[0257] The charge amplifier CAMP may be configured to output a second touch driving signal TDS2 .

[0258] The first control switch circuit CSC1 can control the first touch electrode TE1 to be connected to the amplifier AMP, or can control the first touch electrode TE1 to be connected to the charge amplifier CAMP, or can control the first touch electrode TE1 to be not connected to the amplifier AMP and the charge amplifier CAMP (that is, the first touch electrode TE1 is separated from the amplifier AMP and the charge amplifier CAMP).

[0259] The second control switch circuit CSC2 may control the second touch electrode TE2 to be connected to the charge amplifier CAMP, or may control the second touch electrode TE2 to be not connected to the charge amplifier CAMP (ie, the second touch electrode TE2 is separated or disconnected from the charge amplifier CAMP).

[0260] refer to Fig.12 During the first touch sensing mode period Tt1, the first control switch circuit CSC1 may connect the first touch electrode TE1 and the amplifier AMP. Therefore, the first touch driving signal TDS1 may be applied to the first touch electrode TE1 through the amplifier AMP.

[0261] refer to Fig.12 During the first touch sensing mode period Tt1, the second control switch circuit CSC2 may connect the second touch electrode TE2 and the charge amplifier CAMP. Therefore, the charge amplifier CAMP may sense the second touch electrode TE2.

[0262] refer to Fig.13 During the first sub sensing period Tt21 of the second touch sensing mode period Tt2, the first control switch circuit CSC1 may connect the first touch electrode TE1 to the charge amplifier CAMP.

[0263] During the first sub sensing period Tt21 of the second touch sensing mode period Tt2, the second touch drive signal TDS2 may be input to the first input node IN1 of the charge amplifier CAMP. The second touch drive signal TDS2 input to the first input node IN1 of the charge amplifier CAMP may be applied to the first touch electrode TE1 through the second input node IN2 of the charge amplifier CAMP.

[0264] The charge amplifier CAMP may be connected to the second input node IN2 and may sense the first touch electrode TE1 supplied with the second touch driving signal TDS2.

[0265] refer to Fig.13 , during the first sub sensing period Tt21 of the second touch sensing mode period Tt2, the second control switch circuit CSC2 may separate the two or more second touch electrodes TE2 from the two or more charge amplifiers CAMP.

[0266] refer to Fig.14 During the second sub sensing period Tt22 of the second touch sensing mode period Tt2, the first control switch circuit CSC1 may separate the first touch electrode TE1 from the amplifier AMP and the charge amplifier AMP.

[0267] refer to Fig.14 During the second sub sensing period Tt22 in the second touch sensing mode period Tt2, the second control switch circuit CSC2 may connect the second touch electrode TE2 to the charge amplifier CAMP.

[0268] During the second sub sensing period Tt22 in the second touch sensing mode period Tt2, the second touch drive signal TDS2 may be input to the first input node IN1 of the charge amplifier CAMP. The second touch drive signal TDS2 input to the first input node IN1 of the charge amplifier CAMP may be applied to the second touch electrode TE2 through the second input node IN2 of the charge amplifier CAMP.

[0269] The charge amplifier CAMP may be connected to the second input node IN2 and may sense the second touch electrode TE2 supplied with the second touch driving signal TDS2.

[0270] In addition, during the second touch sensing mode period Tt2, the suspended touch sensing may be performed in a self-sensing manner. For efficient suspended touch sensing, when the suspended touch sensing is performed in a self-sensing manner, the touch drive circuit 160 may simultaneously sense two or more touch electrodes TE by electrically connecting the two or more touch electrodes TE. For example, for efficient suspended touch sensing, the touch drive circuit 160 may sense the two or more touch electrodes TE by grouping the two or more touch electrodes TE together.

[0271] In an example embodiment of the present disclosure, when the suspended touch sensing is performed in a self-sensing manner, a configuration of simultaneously driving and sensing two or more touch electrodes TE by grouping together may be referred to as “channel bonding driving”.

[0272] Below, we will refer to Figures 15 to 19 The channel bonding driving of the touch display device 100 according to an exemplary embodiment of the present disclosure is described in more detail.

[0273] Fig.15 A plurality of channel bonding group areas CHBG included in the touch sensor TS according to an example embodiment of the present disclosure are illustrated.

[0274] refer to Fig.15, the touch sensor TS according to the exemplary embodiment of the present disclosure may include a plurality of first touch electrodes TE1 and a plurality of second touch electrodes TE2. Each of the plurality of first touch electrodes TE1 may extend in a first direction, and each of the plurality of second touch electrodes TE2 may extend in a second direction different from the first direction. Therefore, the plurality of first touch electrodes TE1 and the plurality of second touch electrodes TE2 may intersect with each other. For example, the plurality of first touch electrodes TE1 and the plurality of second touch electrodes TE2 may intersect with each other in a grid form.

[0275] refer to Fig.15 The touch sensor TS according to the exemplary embodiment of the present disclosure may include a plurality of channel bonding group areas CHBG. Each of the plurality of channel bonding group areas CHBG may be an area where two or more first touch electrodes TE1 and two or more second touch electrodes TE2 intersect.

[0276] refer to Fig.15 , two or more first touch electrodes TE1 may pass through one channel bonding group area CHBG in the first direction, and two or more second touch electrodes TE2 may pass through one channel bonding group area CHBG in the second direction.

[0277] refer to Fig.15 When the floating touch sensing is performed in the self-sensing mode, the channel bonding drive may be applied. However, when the contact touch sensing is performed in the mutual sensing mode, the channel bonding drive may not be applied.

[0278] During the first sub sensing period Tt21 of the second touch sensing mode period Tt2, in order to sense a suspended touch in a self-sensing manner, when channel bonding driving is performed, two or more first touch electrodes TE1 passing through one channel bonding group area CHBG in the first direction may be electrically connected as one large first touch electrode.

[0279] During the second sub-sensing period Tt22 of the second touch sensing mode period Tt2, in order to sense a suspended touch in a self-sensing manner, when channel bonding driving is performed, two or more second touch electrodes TE2 passing through one channel bonding group area CHBG in the second direction can be electrically connected as one large second touch electrode.

[0280] Below, we will refer to Figures 16 to 19 A touch sensing method (ie, a touch driving method) and a channel bonding driving method for two types of touches (eg, a contact touch and a floating touch) according to an example embodiment of the present disclosure are described in more detail.

[0281] Fig.16 A touch driving circuit 160 according to an example embodiment of the present disclosure is shown.

[0282] refer to Fig.16 , M first touch electrodes (TE1_1 to TE1_m) may be arranged to pass through one channel bonding group region CHBG in the first direction. M first touch lines (TL1_1 to TL1_m) may be connected to the M first touch electrodes (TE1_1 to TE1_m). Here, M is a natural number greater than or equal to 2.

[0283] refer to Fig.16 , N second touch electrodes (TE2_1 to TE2_n) may be arranged to pass through one channel bonding group region CHBG in the second direction. N second touch lines (TL2_1 to TL2_n) may be connected to the N second touch electrodes (TE2_1 to TE2_n). Here, N is a natural number greater than or equal to 2.

[0284] refer to Fig.16 , the touch driving circuit 160 may include M amplifiers (AMP1 to AMPm), N charge amplifiers (CAMP1 to CAMPn), a first control switch circuit CSC1 and a second control switch circuit CSC2.

[0285] refer to Fig.16 , the M amplifiers (AMP1 to AMPm) may correspond to the M first touch electrodes (TE1_1 to TE1_m). The M amplifiers (AMP1 to AMPm) may be configured to output a first touch driving signal TDS1 having a first amplitude ΔV1.

[0286] refer to Fig.16 , the N charge amplifiers (CAMP1 to CAMPn) may correspond to the N second touch electrodes (TE2_1 to TE2_n).

[0287] refer to Fig.16 Each of the N charge amplifiers (CAMP1 to CAMPn) may include an operational amplifier OAMP and a feedback capacitor Cfb. Each of the operational amplifiers OAMP of the N charge amplifiers (CAMP1 to CAMPn) may include a first input node (IN1_1 to IN1_n), a second input node (IN2_1 to IN2_n), and an output node (OUT1 to OUTn).

[0288] refer to Fig.16 , a reference voltage VREF having a constant voltage level or a second touch driving signal TDS2 having a second amplitude ΔV2 may be input to a first input node (IN1_1 to IN1_n) of an operational amplifier OAMP of each of the N charge amplifiers (CAMP1 to CAMPn).

[0289] refer to Fig.16 , the feedback capacitor Cfb of each of the N charge amplifiers (CAMP1 to CAMPn) may be connected between the second input node (IN2_1 to IN2_n) and the output node (OUT1 to OUTn) of the operational amplifier OAMP. The reset switch RST of each of the N charge amplifiers (CAMP1 to CAMPn) may be connected between the second input node (IN2_1 to IN2_n) and the output node (OUT1 to OUTn) of the operational amplifier OAMP. For example, the reset switch RST of each of the N charge amplifiers (CAMP1 to CAMPn) may be connected between the second input node (IN2_1 to IN2_n) and the output node (OUT1 to OUTn) of the operational amplifier OAMP to control the connection between the second input node (IN2_1 to IN2_n) and the output node (OUT1 to OUTn) of the operational amplifier OAMP.

[0290] refer to Fig.16 , the first control switch circuit CSC1 may be configured to control connections between the M first touch electrodes (TE1_1 to TE1_m) and the M amplifiers (AMP1 to AMPm) and connections between the M first touch electrodes (TE1_1 to TE1_m) and the N charge amplifiers (CAMP1 to CAMPn).

[0291] The first control switch circuit CSC1 can control the connection of all or part of the M first touch electrodes (TE1_1 to TE1_m) to all or part of the M amplifiers (AMP1 to AMPm), or the connection of all or part of the M first touch electrodes (TE1_1 to TE1_m) to all or part of the N charge amplifiers (CAMP1 to CAMPn), or the separation of the M first touch electrodes (TE1_1 to TE1_m) from the M amplifiers (AMP1 to AMPm) and the N charge amplifiers (CAMP1 to CAMPn).

[0292] refer to Fig.16 , the first control switch circuit CSC1 may include M first control switches (STX1 to STXm). Each of the M first control switches (STX1 to STXm) included in the first control switch circuit CSC1 may include M first nodes (NM1 to NMm) connected to M amplifiers (AMP1 to AMPm) and M second nodes (NS1 to NSm) connected to one first sharing line TSH.

[0293] The M second nodes ( NS1 to NSm) of the M first control switches ( STX1 to STXm) may be electrically connected to the second input node IN2_n of the specific charge amplifier CAMPn through one first sharing line TSH.

[0294] refer to Fig.16 During the first touch sensing mode period Tt1, each of the M first control switches (STX1 to STXm) may electrically connect the M first touch lines (TL1_1 to TL1_m) and the M first nodes (NM1 to NMm) sequentially or simultaneously. In this case, the M first touch lines (TL1_1 to TL1_m) may receive the first touch drive signal TDS1 from the M amplifiers (AMP1 to AMPm) sequentially or simultaneously.

[0295] refer to Fig.16 During the first sub-sensing period Tt21 within the second touch sensing mode period Tt2, each of the M first control switches (STX1 to STXm) can electrically connect the M first touch lines (TL1_1 to TL1_m) and the M second nodes (NS1 to NSm) at the same time. In this case, the M first touch lines (TL1_1 to TL1_m) can be connected to the second input node IN2_n of the specific charge amplifier CAMPn through one first shared line TSH to which the m second nodes (NS1 to NSm) are connected.

[0296] Therefore, the second touch drive signal TDS2 output from the second input node IN2_n of the specific charge amplifier CAMPn can be applied to the M first touch electrodes (TE1_1 to TE1_m) through the M first touch lines (TL1_1 to TL1_m). The specific charge amplifier CAMPn can sense the M first touch electrodes (TE1_1 to TE1_m) through the M first touch lines (TL1_1 to TL1_m).

[0297] refer to Fig.16 During the second sub-sensing period Tt22 in the second touch sensing mode period Tt2, each of the M first control switches (STX1 to STXm) can electrically separate or isolate the M first touch lines (TL1_1 to TL1_m) from the M first nodes (NM1 to NMm) and the M second nodes (NS1 to NSm).

[0298] refer to Fig.16 , the second control switch circuit CSC2 may be configured to control connections between the N second touch electrodes (TE2_1 to TE2_n) and the N charge amplifiers (CAMP1 to CAMPn).

[0299] The second control switch circuit CSC2 can control all or part of the N second touch electrodes (TE2_1 to TE2_n) to be connected to all or part of the N charge amplifiers (CAMP1 to CAMPn), or control all or part of the N second touch electrodes (TE2_1 to TE2_n) to be separated from the N charge amplifiers (CAMP1 to CAMPn).

[0300] refer to Fig.16 The second control switch circuit CSC2 may include N second control switches (SRX1 to SRXn), which control the connection between the N second touch lines (TL2_1 to TL2_n) and the second input nodes (IN2_1 to IN2_n) of the N charge amplifiers (CAMP1 to CAMPn).

[0301] refer to Fig.16 The second control switch circuit CSC2 may further include a shared control switch SRSH for controlling the connection between the N second touch lines (TL2_1 to TL2_n).

[0302] refer to Fig.16 , among the N charge amplifiers (CAMP1 to CAMPn), a specific charge amplifier (e.g., CAMPn) can drive and sense one channel bonding group region CHBG. In this case, among the N charge amplifiers (CAMP1 to CAMPn), charge amplifiers other than the specific charge amplifier (e.g., CAMPn) are not operable. For example, a specific charge amplifier (e.g., CAMPn) among the N charge amplifiers (CAMP1 to CAMPn) can be operated to drive and sense one channel bonding group region CHBG. However, the present disclosure is not limited thereto.

[0303] During the first sub-sensing period Tt21 in the second touch sensing mode period Tt2, a specific charge amplifier (e.g., CAMPn) among the N charge amplifiers (CAMP1 to CAMPn) can simultaneously drive and simultaneously sense the M first touch electrodes (TE1_1 to TE1_m) associated with a channel binding group area CHBG.

[0304] During the second sub-sensing period Tt22 in the second touch sensing mode period Tt2, a specific charge amplifier (e.g., CAMPn) among the N charge amplifiers (CAMP1 to CAMPn) can simultaneously drive and simultaneously sense N second touch electrodes (TE2_1 to TE2_n) associated with a channel binding group area CHBG.

[0305] refer to Fig.16, a specific charge amplifier (eg, CAMPn) among the N charge amplifiers (CAMP1 to CAMPn) may further include an additional feedback capacitor LAR_Cfb and a capacitance control switch SCFB connected between the second input node IN2_n and the output node OUTn.

[0306] refer to Fig.16 , when the capacitance control switch SCFB of a specific charge amplifier (eg, CAMPn) is turned on, the additional feedback capacitor LAR_Cfb may be connected in parallel with the feedback capacitor Cfb between the second input node IN2 and the output node OUT.

[0307] When the capacitance control switch SCFB of a specific charge amplifier (eg, CAMPn) is turned off, the additional feedback capacitor LAR_Cfb may be disconnected from the feedback capacitor Cfb between the second input node IN2 and the output node OUT of the specific charge amplifier (eg, CAMPn).

[0308] During the first touch sensing mode period Tt1, the capacitance control switch SCFB of a specific charge amplifier (eg, CAMPn) may be turned off. During the second touch sensing mode period Tt2, the capacitance control switch SCFB of the specific charge amplifier (eg, CAMPn) may be turned on.

[0309] If the shared control switch SRSH of a specific charge amplifier (e.g., CAMPn) is in an off state and the M first touch electrodes (TE1_1 to TE1_m) are connected to M amplifiers (AMP1 to AMPm) through M first control switches (STX1 to STXm), the capacitance control switch SCFB of the specific charge amplifier (e.g., CAMPn) can be in an off state.

[0310] When the M first touch electrodes (TE1_1 to TE1_m) are connected to the first sharing line TSH through the M first control switches (STX1 to STXm), the capacitance control switch SCFB may be in an on state.

[0311] When the sharing control switch SRSH is in the on state, the capacitance control switch SCFB may be in the on state.

[0312] During the first sub sensing period Tt21, two or more first touch electrodes TE1 among the plurality of first touch electrodes TE1 may be electrically connected to each other. Also, during the second sub sensing period Tt22, two or more second touch electrodes TE2 among the plurality of second touch electrodes TE2 may be electrically connected to each other.

[0313] In the following, reference will be made to Fig.17 Describe in more detail Fig.16The operation of the touch driving circuit 160 during the first touch sensing mode period Tt1. Fig.18 and Fig.19 Describe in more detail Fig.16 Operation of the touch driving circuit 160 during the second touch sensing mode period Tt2.

[0314] Fig.17 The touch driving circuit 160 during the first touch sensing mode period Tt1 according to an example embodiment of the present disclosure is shown.

[0315] refer to Fig.17 During the first touch sensing mode period Tt1, contact touch sensing may be performed in a mutual sensing manner. To this end, the touch drive circuit 160 may supply a first touch drive signal TDS1 to two or more first touch electrodes (TE1_1 to TE1_m) through two or more amplifiers (AMP1 to AMPm), and sense two or more second touch electrodes (TE2_1 to TE2_n) through two or more charge amplifiers (CAMP1 to CAMPn). Here, m may be a natural number greater than or equal to 2, and n may be a natural number greater than or equal to 2.

[0316] refer to Fig.17 During the first touch sensing mode period Tt1, the touch driving circuit 160 may sequentially supply the first touch driving signal TDS1 to the two or more first touch electrodes (TE1_1 to TE1_m) by sequentially using two or more amplifiers (AMP1 to AMPm). To this end, during the first touch sensing mode period Tt1, the first control switch circuit CSC1 may sequentially connect the M first touch electrodes (TE1_1 to TE1_m) and the M amplifiers (AMP1 to AMPm) to correspond to each other.

[0317] During the first touch sensing mode period Tt1, the M first control switches (STX1 to STXm) included in the first control switch circuit CSC1 may electrically connect the M first touch lines (TL1_1 to TL1_m) and the M amplifiers (AMP1 to AMPm) in sequence. Fig.17 As shown, one first control switch STX1 among the M first control switches (STX1 to STXm) can electrically connect the corresponding first touch line TL1_1 and the corresponding amplifier AMP1, and another first control switch STX2 can electrically connect the corresponding second touch line TL1_2 and the corresponding amplifier AMP2.

[0318] refer to Fig.17During the first touch sensing mode period Tt1, each of the m first control switches (STX1 to STXm) may sequentially connect the M first touch lines (TL1_1 to TL1_m) and the M first nodes (NM1 to NMm). In this case, the M first touch lines (TL1_1 to TL1_m) may sequentially or simultaneously receive the first touch drive signal TDS1 from the M amplifiers (AMP1 to AMPm).

[0319] and Fig.17 Unlike the example shown in the figure, during the first touch sensing mode period Tt1, the touch driving circuit 160 can simultaneously supply the first touch driving signal TDS1 to two or more first touch electrodes (TE1_1 to TE1_m) by using two or more amplifiers (AMP1 to AMPm) at the same time. In this case, at least one of the first touch driving signals TDS1 simultaneously supplied to the two or more first touch electrodes (TE1_1 to TE1_m) can have a phase difference with the other first touch driving signals. To this end, during the first touch sensing mode period Tt1, the M first control switches (STX1 to STXm) included in the first control switch circuit CSC1 can simultaneously connect the M first touch electrodes (TE1_1 to TE1_m) and the M amplifiers (AMP1 to AMPm). That is, during the first touch sensing mode period Tt1, each of the M first control switches (STX1 to STXm) can simultaneously connect the M first touch lines (TL1_1 to TL1_m) and the M first nodes (NM1 to NMm). In this case, the M first touch lines ( TL1_1 to TL1_m) may simultaneously receive the first touch driving signals TDS1 from the M amplifiers ( AMP1 to AMPm).

[0320] refer to Fig.17 , during the first touch sensing mode period Tt1, the second control switch circuit CSC2 may connect the N second touch electrodes (TE2_1 to TE2_n) and the N charge amplifiers (CAMP1 to CAMPn) to correspond to each other.

[0321] During the first touch sensing mode period Tt1, the N second control switches (SRX1 to SRXn) may electrically connect the N second touch lines (TL2_1 to TL2_n) and the second input nodes (IN2_1 to IN2_n) of the N charge amplifiers (CAMP1 to CAMPn). In this case, the shared control switch SRSH may be in an off state.

[0322] refer to Fig.17, during the first touch sensing mode period Tt1, the M amplifiers (AMP1 to AMPm) may be configured to output a first touch driving signal (TDS1) having a first amplitude ΔV1 to the M first touch electrodes (TE1_1 to TE1_m).

[0323] refer to Fig.17 , during the first touch sensing mode period Tt1, the N charge amplifiers (CAMP1 to CAMPn) may receive the reference voltage VREF whose voltage level does not change through the first input nodes (IN1_1 to IN1_n).

[0324] refer to Fig.17 , during the first touch sensing mode period Tt1, the N charge amplifiers (CAMP1 to CAMPn) may sense the N second touch electrodes (TE2_1 to TE2_n) electrically connected to the second input nodes (IN2_1 to IN2_n). That is, during the first touch sensing mode period Tt1, the N charge amplifiers (CAMP1 to CAMPn) may detect or receive a touch sensing signal from each of the N second touch electrodes (TE2_1 to TE2_n) electrically connected to the second input nodes (IN2_1 to IN2_n).

[0325] refer to Fig.17 During the first touch sensing mode period Tt1, the capacitance control switch SCFB included in the specific charge amplifier CAMPn may be in an off state. Therefore, the additional feedback capacitor LAR_Cfb included in the specific charge amplifier CAMPn may not be connected in parallel with the feedback capacitor Cfb, so that the feedback capacitance may not increase.

[0326] That is, during the first touch sensing mode period Tt1, the capacitance control switch SCFB of the specific charge amplifier CAMPn may be in an off state. During the first touch sensing mode period Tt1, when the M first touch electrodes (TE1_1 to TE1_m) are connected to the M amplifiers (AMP1 to AMPm) through the M first control switches (STX1 to STXm), the capacitance control switch SCFB of the specific charge amplifier CAMPn may be in an off state.

[0327] During the first touch sensing mode period Tt1, when the M first touch electrodes (TE1_1 to TE1_m) are connected to the M amplifiers (AMP1 to AMPm) through the M first control switches (STX1 to STXm), the shared control switch SRSH included in the second control switch circuit CSC2 may be in an off state.

[0328] Fig.18 and Fig.19The touch driving circuit 160 during the second touch sensing mode period Tt2 according to an example embodiment of the present disclosure is shown.

[0329] refer to Fig.18 and Fig.19 , during the second touch sensing mode period Tt2, there may be suspended touch sensing performed in a self-sensing manner.

[0330] For this reason, Fig.18 As shown, the touch drive circuit 160 can simultaneously supply the first touch drive signal TDS1 to two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to each other through a specific charge amplifier (CAMPn) among two or more charge amplifiers (CAMP1 to CAMPn), and sense the two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to each other. Here, M or m may be a natural number greater than or equal to 2, and N or n may be a natural number greater than or equal to 2.

[0331] Then, if Fig.19 As shown, the touch drive circuit 160 can simultaneously supply the first touch drive signal TDS1 to two or more second touch electrodes (TE2_1 to TE2_n) electrically connected to each other through a specific charge amplifier CAMPn among two or more charge amplifiers (CAMP1 to CAMPn), and sense the two or more second touch electrodes (TE2_1 to TE2_n) electrically connected to each other. Here, M or m may be a natural number greater than or equal to 2, and N or n may be a natural number greater than or equal to 2.

[0332] refer to Fig.18 and Fig.19 During the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the N charge amplifiers (CAMP1 to CAMPn) can supply a second touch drive signal TDS2 to two or more second touch electrodes (TE2_1 to TE2_n) or two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to the second input node IN2_n.

[0333] refer to Fig.18 and Fig.19 During the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the n charge amplifiers (CAMP1 to CAMPn) can sense two or more second touch electrodes (TE2_1 to TE2_n) or two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to the second input node IN2_n.

[0334] That is, during the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the n charge amplifiers (CAMP1 to CAMPn) can detect or receive touch sensing signals from two or more second touch electrodes (TE2_1 to TE2_n) or two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to the second input node IN2_n.

[0335] refer to Fig.18 and Fig.19 , the second touch sensing mode period Tt2 may include a first sub sensing period Tt21 for sensing the plurality of first touch electrodes TE1 in a channel-binding group driving manner and a second sub sensing period Tt22 for sensing the plurality of second touch electrodes TE2 in a channel-binding group driving manner.

[0336] During the second touch sensing mode period Tt2, the capacitance control switch SCFB of the specific charge amplifier CAMPn may be in an on state. During the second touch sensing mode period Tt2, a second touch drive signal TDS2 having a time-varying voltage level and a second amplitude ΔV2 may be applied to the first input node IN1_n of the specific charge amplifier CAMPn.

[0337] As described above, the second touch sensing mode period Tt2 may include a first sub-sensing period Tt21 and a second sub-sensing period (Tt22). Fig.18 The operation of the touch driving circuit 160 during the first sub-sensing period Tt21 of the second touch sensing mode period Tt2 is described. Fig.19 The operation of the touch driving circuit 160 during the second sub sensing period Tt22 of the second touch sensing mode period Tt2 is described.

[0338] Fig.18 The touch driving circuit 160 during the first sub sensing period Tt21 of the second touch sensing mode period Tt2 according to an example embodiment of the present disclosure is shown.

[0339] refer to Fig.18 During the first sub-sensing period Tt21 of the second touch sensing mode period Tt2, the suspended touch sensing may be performed in a self-sensing manner.

[0340] To this end, during the first sub-sensing period Tt21 of the second touch sensing mode period Tt2, the touch driving circuit 160 can simultaneously supply the first touch driving signal TDS1 to the two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to each other through a specific charge amplifier (CAMPn) among the two or more charge amplifiers (CAMP1 to CAMPn), and sense the two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to each other. Here, M or m may be a natural number greater than or equal to 2, and N or n may be a natural number greater than or equal to 2.

[0341] During the first sub sensing period Tt21 of the second touch sensing mode period Tt2 , the M amplifiers ( AMP1 to AMPm) may not operate.

[0342] refer to Fig.18 During the first sub-sensing period Tt21 of the second touch sensing mode period Tt2, each of the M first control switches (STX1 to STXm) can electrically connect the M first touch lines (TL1_1 to TL1_m) and the M second nodes (NS1 to NSm) at the same time. Therefore, the M first touch lines (TL1_1 to TL1_m) can be connected to the second input node IN2_n of the specific charge amplifier CAMPn through one first shared line TSH to which the M second nodes (NS1 to NSm) are connected.

[0343] refer to Fig.18 During the first sub-sensing period Tt21 of the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the n charge amplifiers (CAMP1 to CAMPn) can supply the second touch drive signal TDS2 to two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to the second input node IN2_n.

[0344] refer to Fig.18 During the first sub-sensing period Tt21 in the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the N charge amplifiers (CAMP1 to CAMPn) can sense two or more first touch electrodes (TE1_1 to TE1_m) electrically connected to the second input node IN2_n.

[0345] refer to Fig.18 During the first sub sensing period Tt21 in the second touch sensing mode period Tt2, the plurality of first touch electrodes (TE1_1 to TE1_m) may be driven and sensed using a self-sensing method and a channel bonding group driving method.

[0346] refer to Fig.18During the first sub-sensing period Tt21 in the second touch sensing mode period Tt2, the M first control switches (STX1 to STXm) included in the first control switch circuit CSC1 may connect the two or more first touch electrodes (TE1_1 to TE1_m) to a specific charge amplifier CAMPn among the two or more charge amplifiers (CAMP1 to CAMPn). Therefore, the two or more first touch electrodes (TE1_1 to TE1_m) may be commonly connected to the first sharing line TSH.

[0347] During the first sub-sensing period Tt21 in the second touch sensing mode period Tt2, the N second control switches (SRX1 to SRXn) included in the second control switch circuit CSC2 may be in an off state. Therefore, the two or more second touch electrodes (TE2_1 to TE2_n) may be electrically disconnected or separated from the two or more charge amplifiers (CAMP1 to CAMPn). In this case, the shared control switch SRSH included in the second control switch circuit CSC2 may be in an off state.

[0348] refer to Fig.18 During the first sub sensing period Tt21 in the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the N charge amplifiers (CAMP1 to CAMPn) may receive the second touch drive signal TDS2 having the second amplitude ΔV2 through the first input node IN1_n.

[0349] refer to Fig.18 During the first sub-sensing period Tt21 in the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the N charge amplifiers (CAMP1 to CAMPn) can supply the second touch drive signal TDS2 input through the first input node IN1_n to the M first touch electrodes (TE1_1 to TE1_m) that are electrically connected together while passing through a channel binding group area CHBG in the first direction, and can simultaneously sense the M first touch electrodes (TE1_1 to TE1_m) that are electrically connected together.

[0350] During the second touch sensing mode period Tt2, the capacitance control switch SCFB of the specific charge amplifier CAMPn may be in an on state. Therefore, the additional feedback capacitor LAR_Cfb included in the specific charge amplifier CAMPn may be connected in parallel with the feedback capacitor Cfb. Therefore, the feedback capacitance may be increased.

[0351] When the M first touch electrodes (TE1_1 to TE1_m) are connected to the first sharing line TSH through the M first control switches (STX1 to STXm), the capacitance control switch SCFB of the specific charge amplifier CAMPn may be in an on state.

[0352] Fig.19 The touch driving circuit 160 during the second sub sensing period Tt22 of the second touch sensing mode period Tt2 according to an example embodiment of the present disclosure is shown.

[0353] refer to Fig.19 , the suspended touch sensing may be performed in a self-sensing manner during the second sub-sensing period Tt22 in the second touch sensing mode period Tt2.

[0354] To this end, during the second sub-sensing period Tt22 of the second touch sensing mode period Tt2, the touch drive circuit 160 can simultaneously supply the first touch drive signal TDS1 to the two or more second touch electrodes (TE2_1 to TE2_n) electrically connected to each other through a specific charge amplifier CAMPn among the two or more charge amplifiers (CAMP1 to CAMPn), and can sense the two or more second touch electrodes (TE2_1 to TE2_n) electrically connected to each other. Here, M or m can be a natural number greater than or equal to 2, and N or n can be a natural number greater than or equal to 2.

[0355] During the second sub sensing period Tt22 of the second touch sensing mode period Tt2 , the M amplifiers ( AMP1 to AMPm) may not operate.

[0356] Therefore, reference Fig.19 During the second sub-sensing period Tt22 in the second touch sensing mode period Tt2, each of the M first control switches (STX1 to STXm) can electrically isolate or separate the M first touch lines (TL1_1 to TL1_m) from both the M first nodes (NM1 to NMm) and the M second nodes (NS1 to NSm).

[0357] refer to Fig.19 During the second sub-sensing period Tt22 in the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the n charge amplifiers (CAMP1 to CAMPn) can supply a second touch drive signal TDS2 to two or more second touch electrodes (TE2_1 to TE2_n) electrically connected to the second input node IN2_n.

[0358] refer to Fig.19During the second sub-sensing period Tt22 in the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the N charge amplifiers (CAMP1 to CAMPn) can sense two or more second touch electrodes (TE2_1 to TE2_n) electrically connected to the second input node IN2_n.

[0359] refer to Fig.19 During the second sub sensing period Tt22 of the second touch sensing mode period Tt2, the plurality of second touch electrodes (TE2_1 to TE2_n) may be driven and sensed using a self-sensing method and a channel bonding group driving method.

[0360] refer to Fig.19 During the second sub-sensing period Tt22 of the second touch sensing mode period Tt2, the M first control switches (STX1 to STXm) included in the first control switch circuit CSC1 can separate two or more first touch electrodes (TE1_1 to TE1_m) from two or more amplifiers (AMP1 to AMPm) and two or more charge amplifiers (CAMP1 to CAMPn).

[0361] refer to Fig.19 , during the second sub sensing period Tt22 in the second touch sensing mode period Tt2, the second control switch circuit CSC2 may connect the two or more second touch electrodes (TE2_1 to TE2_n) to a specific charge amplifier (CAMPn).

[0362] refer to Fig.19 During the second sub-sensing period Tt22 in the second touch sensing mode period Tt2, all shared control switches SRSH included in the second control switch circuit CSC2 may be in an on state. In addition, among the N second control switches (SRX1 to SRXn) included in the second control switch circuit CSC2, only the second control switch SRXn corresponding to the specific charge amplifier CAMPn may be in an on state, and the remaining second control switches (SRX1, SRX2, etc.) may be turned off.

[0363] Therefore, the second touch electrodes (TE2_1 to TE2_n) may all be electrically connected to one another, and may be connected together to the second input node IN2_n of the specific charge amplifier CAMPn.

[0364] refer to Fig.19During the second sub sensing period Tt22 in the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the N charge amplifiers (CAMP1 to CAMPn) may receive the second touch drive signal TDS2 having the second amplitude ΔV2 through the first input node IN1_n.

[0365] refer to Fig.19 During the second sub-sensing period Tt22 in the second touch sensing mode period Tt2, a specific charge amplifier CAMPn among the n charge amplifiers (CAMP1 to CAMPn) can simultaneously supply the second touch drive signal TDS2 input through the first input node IN1_n to the N second touch electrodes (TE2_1 to TE2_n) passing through a channel binding group area CHBG in the second direction, and can simultaneously sense the N second touch electrodes (TE2_1 to TE2_n).

[0366] During the second touch sensing mode period Tt2, the capacitance control switch SCFB of the specific charge amplifier CAMPn may be turned on. Therefore, the additional feedback capacitor LAR_Cfb included in the specific charge amplifier CAMPn may be connected in parallel with the feedback capacitor Cfb. Therefore, the feedback capacitance may be increased.

[0367] During the second touch sensing mode period Tt2 , when the sharing control switch SRSH is turned on, the capacitance control switch SCFB of the specific charge amplifier CAMPn may be turned on.

[0368] The touch display device 100 according to the exemplary embodiment of the present disclosure may be implemented as a wearable device worn on the body (e.g., wrist, head, waist, etc.) or fabric or clothing. For example, the wearable display may include a smart watch, a helmet, gloves, smart clothes, smart glasses, etc.

[0369] As described above, the touch display device 100 according to the exemplary embodiment of the present disclosure can provide a sensing function not only for contact touch but also for suspended touch. Therefore, if the touch display device 100 according to the exemplary embodiment of the present disclosure is used to implement a wearable device worn on the user's body, in addition to contact touch sensing, the wearable device 2000 can also provide various application functions suitable for wearable characteristics through suspended touch sensing.

[0370] The exemplary embodiments of the present disclosure described above are briefly described below.

[0371] A touch display device according to an example embodiment of the present disclosure may include a touch sensor including a plurality of first touch electrodes and a plurality of second touch electrodes, and a touch driving circuit for driving the touch sensor.

[0372] The operation mode of the touch display device may include a display mode and a touch sensing mode. The display mode and the touch sensing mode may be switched to each other or may be performed simultaneously.

[0373] The touch sensing mode may include a first touch sensing mode and a second touch sensing mode. The first touch sensing mode and the second touch sensing mode may be performed in time periods separated in time. That is, the first touch sensing mode and the second touch sensing mode may not overlap each other in time.

[0374] The operation period of the touch display device may include a first touch sensing mode period and a second touch sensing mode period. In the first touch sensing mode period, a first touch drive signal having a first amplitude is applied to the touch sensor, and in the second touch sensing mode period, a second touch drive signal having a second amplitude different from the first amplitude is applied to the touch sensor.

[0375] The first touch driving signal may be sequentially or simultaneously applied to the plurality of first touch electrodes during the first touch sensing mode period.

[0376] During the second touch sensing mode period, the second touch drive signal may be simultaneously applied to two or more first touch electrodes electrically connected to each other among the plurality of first touch electrodes, or the second touch drive signal may be simultaneously applied to two or more second touch electrodes electrically connected to each other among the plurality of second touch electrodes.

[0377] For example, the first touch sensing mode period may be a period for sensing a contact touch that contacts the screen, and the second touch sensing mode period may be a period for sensing a hovering touch that does not contact the screen.

[0378] The second amplitude of the second touch driving signal in the second touch sensing mode period may be greater than the first amplitude of the first touch driving signal in the first touch sensing mode period.

[0379] The second touch sensing mode period may include a first sub-sensing period and a second sub-sensing period which do not overlap with each other.

[0380] During a first sub sensing period within the second touch sensing mode period, a second touch driving signal may be simultaneously applied to two or more first touch electrodes electrically connected to each other among the plurality of first touch electrodes.

[0381] During the second sub sensing period within the second touch sensing mode period, the second touch driving signal may be simultaneously applied to two or more second touch electrodes electrically connected to each other among the plurality of second touch electrodes.

[0382] The touch driving circuit may include two or more amplifiers, two or more charge amplifiers, a first control switch circuit, and a second control switch circuit.

[0383] The first control switch circuit can be configured to control all or part of the two or more first touch electrodes to be connected to all or part of the two or more amplifiers, or to control all or part of the two or more first touch electrodes to be connected to all or part of the two or more charge amplifiers, or to control the two or more first touch electrodes to be separated from the two or more amplifiers and the two or more charge amplifiers.

[0384] The second control switch circuit may be configured to control all or part of the two or more second touch electrodes to be connected to all or part of the two or more charge amplifiers, or to control all or part of the two or more second touch electrodes to be separated from the two or more charge amplifiers.

[0385] The operations of the first control switch circuit and the second control switch circuit are as follows:

[0386] During the first touch sensing mode period, the first control switch circuit may sequentially connect two or more first touch electrodes and two or more amplifiers to each other correspondingly, and the second control switch circuit may connect two or more second touch electrodes and two or more charge amplifiers to each other correspondingly.

[0387] During a first sub-sensing period in a second touch sensing mode period, the first control switch circuit may connect the two or more first touch electrodes to a specific charge amplifier among the two or more charge amplifiers, and the second control switch circuit may separate the two or more second touch electrodes from the two or more charge amplifiers.

[0388] During a second sub-sensing period in a second touch sensing mode period, the first control switch circuit may separate two or more first touch electrodes from the two or more amplifiers and the two or more charge amplifiers, and the second control switch circuit may connect the two or more second touch electrodes to specific charge amplifiers.

[0389] Each of the two or more charge amplifiers may include an operational amplifier including a first input node, a second input node, and an output node, and a feedback capacitor between a second input node and an output node.

[0390] Among the two or more charge amplifiers, remaining charge amplifiers except for a specific charge amplifier may operate only during the first touch sensing mode period.

[0391] Among the two or more charge amplifiers, the specific charge amplifier may operate during both the first touch sensing mode period and the second touch sensing mode period.

[0392] However, operation of the specific charge amplifier during the second touch sensing mode period may be different from operation of the specific charge amplifier during the first touch sensing mode period.

[0393] During the first touch sensing mode period, an operation of the specific charge amplifier may be the same as an operation of the remaining charge amplifiers except for the specific charge amplifier among the two or more charge amplifiers.

[0394] The specific charge amplifier may further include an additional feedback capacitor between the second input node and the output node, and a capacitance-controlled switch controlling a connection between the additional feedback capacitor and one of the second input node and the output node.

[0395] When the capacitance-controlled switch is turned on, the additional feedback capacitor may be connected in parallel with the feedback capacitor between the second input node and the output node.

[0396] When the capacitance-controlled switch is turned off, the additional feedback capacitor may be disconnected from the feedback capacitor between the second input node and the output node.

[0397] During the first touch sensing mode period, the capacitance control switch may be in an off state, and a reference voltage whose voltage level does not vary with time may be applied to a first input node of each of the two or more charge amplifiers.

[0398] During the second touch sensing mode period, the capacitance control switch may be in an on state, and a second touch driving signal having a voltage level that changes with time and having a second amplitude may be applied to the first input node of the specific charge amplifier.

[0399] According to an example embodiment of the present disclosure, a touch display device may further include: a display panel including a plurality of sub-pixels and a touch sensor; a display driving circuit for driving the plurality of sub-pixels; a display controller for controlling the display driving circuit and supplying a first mode control signal to the touch controller; and a touch controller for supplying a second mode control signal to the touch driving circuit.

[0400] An operation period of the touch display device may include a display mode period and a touch sensing mode period, and the touch sensing mode period may include a first touch sensing mode period and a second touch sensing mode period.

[0401] The display mode period, the first touch sensing mode period, and the second touch sensing mode period may be distinguished by the first mode control signal and the second mode control signal.

[0402] The first mode control signal may be a control signal for distinguishing a display mode period and a touch sensing mode period, and the second mode control signal may be a control signal for distinguishing a first touch sensing mode period and a second touch sensing mode period.

[0403] For example, the first mode control signal may be a vertical synchronization signal for dividing one display frame period into an active period and a blanking period, and the active period may be a display mode period, and the blanking period may be a touch sensing mode period.

[0404] For example, the second mode control signal may be a floating enable signal for enabling a floating touch sensing mode as the second touch sensing mode.

[0405] For example, the first mode control signal may include a first signal portion having a first level voltage and a second signal portion having a second level voltage different from the first level voltage, and the second mode control signal may include a third signal portion having a third level voltage and a fourth signal portion having a fourth level voltage different from the third level voltage.

[0406] For example, during the display mode period, the first mode control signal may have a second level voltage, and the second mode control signal may have a third level voltage.

[0407] For example, during the first touch sensing mode period, the first mode control signal may have a first level voltage, and the second mode control signal may have a third level voltage.

[0408] For example, during the second touch sensing mode period, the first mode control signal may have a first level voltage, and the second mode control signal may have a fourth level voltage.

[0409] A touch display device according to an example embodiment of the present disclosure may include: a display panel including a plurality of sub-pixels and a plurality of touch electrodes; a display driving circuit for driving the plurality of sub-pixels; a touch driving circuit for supplying a touch driving signal to at least one of the plurality of touch electrodes; a display controller for controlling the display driving circuit and supplying a first mode control signal to the touch controller; and a touch controller for supplying a second mode control signal to the touch driving circuit.

[0410] An operation period of the touch display device may include a display mode period and a touch sensing mode period, and the touch sensing mode period may include a first touch sensing mode period and a second touch sensing mode period.

[0411] The display mode period, the first touch sensing mode period, and the second touch sensing mode period may be distinguished by the first mode control signal and the second mode control signal.

[0412] The first mode control signal may include a first signal portion having a first level voltage and a second signal portion having a second level voltage different from the first level voltage, and the second mode control signal may include a third signal portion having a third level voltage and a fourth signal portion having a fourth level voltage different from the third level voltage.

[0413] During the display mode period, the first mode control signal may have a second level voltage, and the second mode control signal may have a third level voltage.

[0414] During the first touch sensing mode period, the first mode control signal may have a first level voltage, and the second mode control signal may have a third level voltage.

[0415] During the second touch sensing mode period, the first mode control signal may have a first level voltage, and the second mode control signal may have a fourth level voltage.

[0416] The first mode control signal may be a control signal for dividing the operation period into a display mode period and a touch sensing mode period, and the second mode control signal may be a control signal for dividing the touch sensing mode period into a first touch sensing mode period and a second touch sensing mode period.

[0417] A touch drive circuit according to an example embodiment of the present disclosure may include: two or more amplifiers corresponding to a plurality of first touch electrodes; two or more charge amplifiers corresponding to a plurality of second touch electrodes and each including a feedback capacitor; a first control switch circuit that controls all or part of the plurality of first touch electrodes to be connected to all or part of the two or more amplifiers; or controls all or part of the plurality of first touch electrodes to be connected to all or part of the two or more charge amplifiers, or controls the plurality of first touch electrodes to be separated from the two or more amplifiers and the two or more charge amplifiers; and a second control switch circuit that controls all or part of the plurality of second touch electrodes to be connected to all or part of the two or more charge amplifiers, or controls all or part of the plurality of second touch electrodes to be separated from the two or more charge amplifiers.

[0418] The operation period of the touch driving circuit may include a first touch sensing mode period and a second touch sensing mode period which do not overlap each other, and the second touch sensing mode period may include a first sub-sensing period and a second sub-sensing period which do not overlap each other.

[0419] During the first sub-sensing period, two or more first touch electrodes among the plurality of first touch electrodes may be electrically connected to each other. In addition, during the second sub-sensing period, two or more second touch electrodes among the plurality of second touch electrodes may be electrically connected to each other.

[0420] During the first touch sensing mode period, the first control switch circuit may sequentially connect two or more first touch electrodes and two or more amplifiers to each other correspondingly, and the second control switch circuit may connect two or more second touch electrodes and two or more charge amplifiers to each other correspondingly.

[0421] The second touch sensing mode period may include a first sub-sensing period and a second sub-sensing period which do not overlap with each other.

[0422] During the first sub-sensing period, the first control switch circuit may connect the two or more first touch electrodes to a specific charge amplifier among the two or more charge amplifiers, and the second control switch circuit may separate the two or more second touch electrodes from the two or more charge amplifiers.

[0423] During the second sub sensing period, the first control switch circuit may separate the two or more first touch electrodes from the two or more amplifiers and the two or more charge amplifiers, and the second control switch circuit may connect the two or more second touch electrodes to a specific charge amplifier.

[0424] Each of the two or more charge amplifiers may also include an operational amplifier including a first input node, a second input node, and an output node.

[0425] A feedback capacitor may be connected between the second input node and the output node.

[0426] Certain charge amplifiers may also include a capacitance-controlled switch and an additional feedback capacitor connected between the second input node and the output node.

[0427] If the capacitance-controlled switch is turned on, an additional feedback capacitor may be connected in parallel with the feedback capacitor between the second input node and the output node.

[0428] If the capacitance-controlled switch is open, the additional feedback capacitor may be disconnected from the feedback capacitor between the second input node and the output node.

[0429] A touch drive circuit according to an example embodiment of the present disclosure may include: a first signal input unit configured to receive a reference touch drive signal and a touch mode control signal; and a first signal output unit configured to output a first touch drive signal having a first amplitude or a second touch drive signal having a second amplitude different from the first amplitude to the touch sensor based on the reference touch drive signal and the touch mode control signal.

[0430] During a first touch sensing mode period, the two or more amplifiers are configured to output a first touch driving signal having a first amplitude to the first touch electrode.

[0431] During the second touch sensing mode period, a second touch driving signal having a voltage level varying with time and having a second amplitude is applied to a first input node of a specific charge amplifier among the two or more charge amplifiers.

[0432] During the first sub-sensing period, a specific charge amplifier among the two or more charge amplifiers receives a second touch driving signal having a second amplitude through a first input node.

[0433] During the second sub-sensing period, a specific charge amplifier among the two or more charge amplifiers receives a second touch driving signal having a second amplitude through a first input node.

[0434] The second amplitude is greater than the first amplitude.

[0435] The touch mode control signal may have a first level voltage or a second level voltage.

[0436] If the touch mode control signal has a first level voltage, a first touch driving signal may be applied to N touch electrodes among a plurality of touch electrodes included in the touch sensor at one point in time.

[0437] If the touch mode control signal has the second level voltage, the second touch driving signal may be simultaneously applied to M touch electrodes greater than N among the plurality of touch electrodes included in the touch sensor at one point in time.

[0438] According to an example embodiment of the present disclosure, a touch controller for controlling a touch sensing operation of a touch display device may include a second signal input unit and a second signal output unit, the second signal input unit being configured to receive a first mode control signal from a display controller, and the second signal output unit being configured to output a reference touch drive signal and output a second mode control signal generated based on the first mode control signal.

[0439] The first mode control signal may include a first signal portion having a first level voltage and a second signal portion having a second level voltage different from the first level voltage.

[0440] If the first mode control signal is the second signal portion having the second level voltage, the second mode control signal may have a third level voltage.

[0441] If the first mode control signal is a first signal portion having a first level voltage, the second mode control signal may include a signal portion having a third level voltage and a signal portion having a fourth level voltage different from the third level voltage.

[0442] According to the exemplary embodiments of the present disclosure described above, a touch display device, a touch driving circuit, and a touch controller capable of supporting a variety of touch sensing modes may be provided.

[0443] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller capable of efficiently sensing a contact touch and a floating touch may be provided.

[0444] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller having a control structure and a circuit structure capable of efficiently sensing a contact touch and a floating touch may be provided.

[0445] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller having a control signal system capable of efficiently supporting a display mode, a contact touch sensing mode, and a floating touch sensing mode may be provided.

[0446] According to example embodiments of the present disclosure, a touch display device, a touch driving circuit, and a touch controller capable of low-power operation by efficiently performing display driving, contact touch sensing, and floating touch sensing in terms of driving time may be provided.

[0447] The above description and accompanying drawings provide examples of the technical concept of the present disclosure for illustrative purposes only. Various modifications, additions and substitutions to the described example embodiments will be apparent to those skilled in the art without departing from the spirit and scope of the present disclosure. In addition, the disclosed example embodiments are intended to illustrate the scope of the technical concept of the present disclosure. Therefore, the scope of the present disclosure is not limited to the example embodiments shown.

[0448] Cross-references to related applications

[0449] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0158168, filed on November 15, 2023, which is hereby incorporated by reference in its entirety for all purposes.

Claims

1. A touch display device, comprising: A touch sensor, the touch sensor comprising a plurality of first touch electrodes and a plurality of second touch electrodes; as well as a touch driving circuit configured to drive the touch sensor, The operation period of the touch display device includes a first touch sensing mode period in which a first touch driving signal having a first amplitude is applied to the touch sensor, and a second touch sensing mode period in which a second touch driving signal having a second amplitude different from the first amplitude is applied to the touch sensor. wherein the first touch driving signal is applied to the plurality of first touch electrodes sequentially or simultaneously during the first touch sensing mode period, and During the second touch sensing mode period, the second touch drive signal is simultaneously applied to two or more first touch electrodes electrically connected to each other among the multiple first touch electrodes, or the second touch drive signal is simultaneously applied to two or more second touch electrodes electrically connected to each other among the multiple second touch electrodes.

2. The touch display device according to claim 1, wherein: The second amplitude is greater than the first amplitude.

3. The touch display device according to claim 1, wherein: the second touch sensing mode period includes a first sub-sensing period and a second sub-sensing period which do not overlap each other, wherein, during the first sub-sensing period within the second touch sensing mode period, the second touch driving signal is simultaneously applied to two or more first touch electrodes electrically connected to each other among the plurality of first touch electrodes, and During the second sub-sensing period within the second touch sensing mode period, the second touch driving signal is simultaneously applied to two or more second touch electrodes electrically connected to each other among the plurality of second touch electrodes.

4. The touch display device according to claim 1, wherein: The touch driving circuit comprises: two or more amplifiers; two or more charge amplifiers; a first control switch circuit configured to control all or part of the two or more first touch electrodes to be connected to all or part of the two or more amplifiers, or to control all or part of the two or more first touch electrodes to be connected to all or part of the two or more charge amplifiers, or to control the two or more first touch electrodes to be separated from the two or more amplifiers and the two or more charge amplifiers; and A second control switch circuit, wherein the second control switch circuit is configured to control all or part of the two or more second touch electrodes to be connected to all or part of the two or more charge amplifiers, or to control all or part of the two or more second touch electrodes to be separated from the two or more charge amplifiers.

5. The touch display device according to claim 4, wherein: During the first touch sensing mode period, the first control switch circuit sequentially connects the two or more first touch electrodes and the two or more amplifiers corresponding to each other, and the second control switch circuit connects the two or more second touch electrodes and the two or more charge amplifiers corresponding to each other, wherein the second touch sensing mode period includes a first sub-sensing period and a second sub-sensing period which do not overlap each other, wherein, during the first sub-sensing period, the first control switch circuit connects the two or more first touch electrodes to a specific charge amplifier among the two or more charge amplifiers, and the second control switch circuit separates the two or more second touch electrodes from the two or more charge amplifiers, and During the second sub-sensing period, the first control switch circuit separates the two or more first touch electrodes from the two or more amplifiers and the two or more charge amplifiers, and the second control switch circuit connects the two or more second touch electrodes to the specific charge amplifier.

6. The touch display device according to claim 5, wherein: Each of the two or more charge amplifiers includes an operational amplifier including a first input node, a second input node, and an output node, and a feedback capacitor between the second input node and the output node, wherein the specific charge amplifier further comprises an additional feedback capacitor between the second input node and the output node, and a capacitance-controlled switch for controlling a connection between the additional feedback capacitor and one of the second input node and the output node, wherein, when the capacitance control switch is turned on, the additional feedback capacitor is connected in parallel with the feedback capacitor between the second input node and the output node, and When the capacitance control switch is turned off, the additional feedback capacitor is disconnected from the feedback capacitor between the second input node and the output node.

7. The touch display device according to claim 6, wherein: During the first touch sensing mode period, the capacitance control switch is in an off state, and a reference voltage whose voltage level does not change with time is applied to the first input node of each of the two or more charge amplifiers, and During the second touch sensing mode period, the capacitance control switch is in an on state, and a second touch drive signal having a voltage level varying with time and having the second amplitude is applied to the first input node of the specific charge amplifier.

8. The touch display device according to claim 1, further comprising: A display panel, the display panel comprising a plurality of sub-pixels and the touch sensor; a display driving circuit configured to drive the plurality of sub-pixels; a display controller configured to control the display driving circuit and supply a first mode control signal to the touch controller; as well as the touch controller being configured to supply a second mode control signal to the touch driving circuit, The operation period of the touch display device includes a display mode period and a touch sensing mode period. wherein the touch sensing mode period includes the first touch sensing mode period and the second touch sensing mode period, and The display mode period, the first touch sensing mode period and the second touch sensing mode period are distinguished by the first mode control signal and the second mode control signal.

9. The touch display device according to claim 8, wherein: The first mode control signal is a control signal for distinguishing the display mode period from the touch sensing mode period, and the second mode control signal is a control signal for distinguishing the first touch sensing mode period from the second touch sensing mode period.

10. The touch display device according to claim 8, wherein: The first mode control signal is a vertical synchronization signal for dividing one display frame period into an active period and a blanking period, the active period is the display mode period, and the blanking period is the touch sensing mode period, and The second mode control signal is a suspended enable signal for enabling a suspended touch sensing mode as a second touch sensing mode.

11. The touch display device according to claim 8, wherein: the first mode control signal includes a first signal portion having a first level voltage and a second signal portion having a second level voltage different from the first level voltage, and the second mode control signal includes a third signal portion having a third level voltage and a fourth signal portion having a fourth level voltage different from the third level voltage, wherein, during the display mode period, the first mode control signal has the second level voltage, and the second mode control signal has the third level voltage, wherein, during the first touch sensing mode period, the first mode control signal has the first level voltage, and the second mode control signal has the third level voltage, and During the second touch sensing mode period, the first mode control signal has the first level voltage, and the second mode control signal has the fourth level voltage.

12. The touch display device according to claim 1, wherein: The first touch sensing mode period is a period for sensing a contact touch contacting the screen, and the second touch sensing mode period is a period for sensing a hovering touch not contacting the screen.

13. A touch display device, comprising: A display panel, the display panel comprising a plurality of sub-pixels and a plurality of touch electrodes; a display driving circuit configured to drive the plurality of sub-pixels; a touch driving circuit configured to supply a touch driving signal to at least one touch electrode among the plurality of touch electrodes; a display controller configured to control the display driving circuit and supply a first mode control signal to the touch controller; as well as the touch controller being configured to supply a second mode control signal to the touch driving circuit, The operation period of the touch display device includes a display mode period and a touch sensing mode period. The touch sensing mode period includes a first touch sensing mode period and a second touch sensing mode period, and The display mode period, the first touch sensing mode period and the second touch sensing mode period are distinguished by the first mode control signal and the second mode control signal.

14. The touch display device according to claim 13, wherein: the first mode control signal includes a first signal portion having a first level voltage and a second signal portion having a second level voltage different from the first level voltage, and the second mode control signal includes a third signal portion having a third level voltage and a fourth signal portion having a fourth level voltage different from the third level voltage, wherein, during the display mode period, the first mode control signal has the second level voltage, and the second mode control signal has the third level voltage, wherein, during the first touch sensing mode period, the first mode control signal has the first level voltage, and the second mode control signal has the third level voltage, and During the second touch sensing mode period, the first mode control signal has the first level voltage, and the second mode control signal has the fourth level voltage.

15. The touch display device according to claim 13, wherein: The first mode control signal is a control signal for dividing the operation period into the display mode period and the touch sensing mode period, and the second mode control signal is a control signal for dividing the touch sensing mode period into the first touch sensing mode period and the second touch sensing mode period.

16. A touch driving circuit, the touch driving circuit comprising: two or more amplifiers corresponding to the plurality of first touch electrodes; two or more charge amplifiers corresponding to the plurality of second touch electrodes, each of the two or more charge amplifiers including a feedback capacitor; a first control switch circuit configured to control all or part of the plurality of first touch electrodes to be connected to all or part of the two or more amplifiers, or to control all or part of the plurality of first touch electrodes to be connected to all or part of the two or more charge amplifiers, or to control the plurality of first touch electrodes to be separated from the two or more amplifiers and the two or more charge amplifiers; as well as a second control switch circuit configured to control all or part of the plurality of second touch electrodes to be connected to all or part of the two or more charge amplifiers, or to control all or part of the plurality of second touch electrodes to be separated from the two or more charge amplifiers, wherein the operation period of the touch driving circuit includes a first touch sensing mode period and a second touch sensing mode period which do not overlap with each other, and the second touch sensing mode period includes a first sub-sensing period and a second sub-sensing period which do not overlap with each other, wherein, during the first sub-sensing period, two or more first touch electrodes among the plurality of first touch electrodes are electrically connected to each other, and During the second sub-sensing period, two or more second touch electrodes among the plurality of second touch electrodes are electrically connected to each other.

17. The touch driving circuit according to claim 16, wherein: During the first touch sensing mode period, the two or more amplifiers are configured to output a first touch driving signal having a first amplitude to the first touch electrode.

18. The touch driving circuit according to claim 17, wherein: During the second touch sensing mode period, a second touch driving signal having a voltage level varying with time and having a second amplitude is applied to a first input node of a specific charge amplifier among the two or more charge amplifiers.

19. The touch driving circuit according to claim 16, wherein: During the first touch sensing mode period, the first control switch circuit sequentially connects the two or more first touch electrodes and the two or more amplifiers corresponding to each other, and the second control switch circuit connects the two or more second touch electrodes and the two or more charge amplifiers corresponding to each other, wherein, during the first sub-sensing period, the first control switch circuit connects the two or more first touch electrodes to a specific charge amplifier among the two or more charge amplifiers, and the second control switch circuit separates the two or more second touch electrodes from the two or more charge amplifiers, and During the second sub-sensing period, the first control switch circuit separates the two or more first touch electrodes from the two or more amplifiers and the two or more charge amplifiers, and the second control switch circuit connects the two or more second touch electrodes to the specific charge amplifier.

20. The touch driving circuit according to claim 19, wherein: Each of the two or more charge amplifiers further comprises an operational amplifier comprising a first input node, a second input node, and an output node, wherein the feedback capacitor is connected between the second input node and the output node, The specific charge amplifier further comprises a capacitance-controlled switch and an additional feedback capacitor connected between the second input node and the output node, wherein, when the capacitance control switch is turned on, the additional feedback capacitor is connected in parallel with the feedback capacitor between the second input node and the output node, and When the capacitance control switch is turned off, the additional feedback capacitor is disconnected from the feedback capacitor between the second input node and the output node.

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