CONVERSION INTEGRATOR, TOUCH DRIVE CIRCUIT AND TOUCH DISPLAY DEVICE

Abstract

To provide a converting integrator, a touch driving circuit and a touch display device which are implemented with an efficient structure of an analog front end of the touch driving circuit.SOLUTION: A touch driving circuit 200 includes a first charge regulator 210, a current regulator 220, and a converting integrator 230. The touch driving circuit provide a sensing voltage Vsen by the current regulator, which adjusts the magnitude of a sensing current received via a touch line, and the converting integrator, by which the sensing current output and supplied by the current regulator is converted to a voltage and integrated.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE The embodiments of the present disclosure relate to a conversion integrator, a touch driving circuit, and a touch display device. [Background technology]

[0002] In addition to the function of displaying images, a display device can provide a function of recognizing a user's touch on a display panel and performing input processing based on the recognized touch.

[0003] For touch sensing, the display device may include, for example, a plurality of touch electrodes and a plurality of touch lines arranged on a display panel. The display device may detect a change in capacitance caused by a user's touch by a touch driving circuit that drives the touch electrodes and the touch lines, thereby sensing the user's touch on the display panel.

[0004] A touch driving circuit can include various circuit elements, and different touch driving circuits may have different touch sensing accuracy and efficiency. There is a need for a touch driving circuit that can optimize the circuit elements included in the touch driving circuit and improve the performance of touch sensing. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present disclosure can provide a method for maintaining or improving the performance of touch sensing by a touch drive circuit and optimizing circuit elements included in the touch drive circuit. [Means for solving the problem]

[0006] An embodiment of the present disclosure may provide a touch display device including a plurality of touch electrodes arranged on a display panel, and a touch drive circuit that drives the plurality of touch electrodes and outputs a touch drive signal including a first level section and a second level section, wherein the touch drive circuit includes a current regulator that outputs a first current that reduces a magnitude of an input current received from at least one of the plurality of touch electrodes in at least a portion of the section in which the touch drive signal is at the first level and the section in which the touch drive signal is at the second level, and a conversion integrator that integrates a voltage corresponding to the first current or a second current adjusted from the first current at least once to output a sensing voltage.

[0007] An embodiment of the present disclosure may provide a touch drive circuit including a current regulator that outputs a correction current that reduces a magnitude of an input current received from a touch electrode to which a touch drive signal including a first level section and a second level section is applied, and a conversion integrator that integrates a voltage according to the correction current in each of a section in which the touch drive signal is at the first level and a section in which the touch drive signal is at the second level, to output a sensing voltage.

[0008] An embodiment of the present disclosure may provide a conversion integrator including a first integration block including a first positive integration switch electrically connected to an input end of a sensing current and a positive integration capacitor electrically connected between the first positive integration switch and an input end of an integration reference voltage, and integrating a voltage corresponding to a sensing current input in an interval where the touch drive signal is at a first level, a second integration block including a negative integration capacitor and a first negative integration switch electrically connected between a node between the negative integration capacitor and the input end of the integration reference voltage and the input end of the sensing current, and integrating a voltage corresponding to a sensing current input in an interval where the touch drive signal is at a second level, and a gain buffer that outputs a sensing voltage based on the voltage integrated by the first integration block and the second integration block.

[0009] According to the embodiment of the present disclosure, it is possible to provide a touch driving circuit that reduces the number of circuit elements included in the touch driving circuit and improves the performance and efficiency of touch sensing. In addition, it is possible to provide a touch display device that can reduce power consumption by reducing power consumption using such a touch driving circuit. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a touch display device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a diagram showing an example of a configuration of a touch drive circuit included in a touch display device according to an embodiment of the present disclosure. [Diagram 3] FIG. 2 illustrates an example of a structure of a current regulator included in a touch drive circuit according to an embodiment of the present disclosure. [Figure 4] FIG. 2 illustrates an example of a structure of a current regulator included in a touch drive circuit according to an embodiment of the present disclosure. [Diagram 5] FIG. 13 is a diagram illustrating an example of the structure of a conversion integrator included in a touch drive circuit according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is a diagram illustrating an example of a driving method for the conversion integrator illustrated in FIG. 5. [Figure 7] FIG. 6 is a diagram illustrating an example of a driving method for the conversion integrator illustrated in FIG. 5. [Figure 8] 6 is a diagram showing an example of drive timing of the conversion integrator shown in FIG. 5. [Figure 9] FIG. 13 illustrates another example of a structure of a touch drive circuit according to an embodiment of the present disclosure. [Figure 10] 10 is a diagram showing an example of drive timing of a conversion integrator included in the touch drive circuit shown in FIG. 9. [Figure 11] FIG. 11 is a diagram showing another example of the configuration of a touch drive circuit included in a touch display device according to an embodiment of the present disclosure. [Figure 12] 12 is a diagram showing an example of drive timing of the touch drive circuit shown in FIG. 11. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Some embodiments of the present disclosure will be described in detail below with reference to exemplary drawings. When adding reference symbols to components in each drawing, the same components may be assigned the same symbols as much as possible, even if they are displayed in other drawings. In describing the present disclosure, if it is determined that a specific description of a related publicly known configuration or function may obscure the gist of the present disclosure, the detailed description will be omitted. When "including," "having," "consisting of," and the like are used in this specification, other parts may be added unless "only" is used. When a component is expressed as a singular number, it may include a case where a plurality is included, unless otherwise explicitly stated.

[0012] In addition, in describing components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. are used. These terms are used only to distinguish the components from other components, and do not limit the nature, order, sequence, number, etc. of the components.

[0013] When two or more components are described as being "coupled," "coupled," or "connected" in a description of the positional relationship of components, it should be understood that the two or more components may be directly "coupled," "coupled," or "connected," but it is also possible for the two or more components to be further "intervened" and "coupled," "coupled," or "connected" to other components. Here, the other components may be included in one or more of the two or more components that are "coupled," "coupled," or "connected" to each other.

[0014] In describing the temporal relationship of components, methods of operation, methods of production, etc., when a temporal precedence or precedence relationship or flow precedence relationship is described using, for example, "after," "following," "next to," or "before," this may also include cases where the relationship is not consecutive, unless "immediately" or "directly" is used.

[0015] On the other hand, when a numerical value or its corresponding information (e.g., level, etc.) relating to a component is mentioned, the numerical value or its corresponding information may be interpreted as including a range of error that may occur due to various factors (e.g., process factors, internal or external impacts, noise, etc.) unless otherwise explicitly stated.

[0016] Various embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0017] FIG. 1 is a diagram showing a schematic configuration of a touch display device 100 according to an embodiment of the present disclosure.

[0018] Referring to FIG. 1, a touch display device 100 may include a display panel 110, a gate driving circuit 120 for driving the display panel 110, a data driving circuit 130, a controller 140, and the like.

[0019] The display panel 110 may include an active area AA in which a plurality of sub-pixels SP are arranged, and a non-active area NA located outside the active area AA.

[0020] A plurality of gate lines GL and a plurality of data lines DL are arranged on the display panel 110, and sub-pixels SP may be located in areas where the gate lines GL and the data lines DL intersect.

[0021] In addition, the touch display device 100 may include a plurality of touch electrodes arranged on the display panel 110 for touch sensing. The touch display device 100 may include at least one touch drive circuit 200 for driving the touch electrodes TE.

[0022] A plurality of touch electrodes TE may be arranged in the active area AA. Each of the plurality of touch electrodes TE may be arranged in an area corresponding to two or more sub-pixels SP.

[0023] The display panel 110 may be provided with a plurality of touch lines TL electrically connected to the touch electrodes TE.

[0024] First, the configuration for driving the display in the touch display device 100 will be described. The gate driving circuit 120 is controlled by the controller 140 and can sequentially output scan signals to a plurality of gate lines GL arranged on the display panel 110 to control the driving timing of a plurality of sub-pixels SP.

[0025] The gate driving circuit 120 may include one or more gate driver integrated circuits (GDICs), and may be located on only one side of the display panel 110 or on both sides, depending on the driving method.

[0026] Each gate driver integrated circuit GDIC may be connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) method. Alternatively, each gate driver integrated circuit GDIC may be implemented as a GIP (Gate In Panel) type and directly disposed on the display panel 110. Alternatively, each gate driver integrated circuit GDIC may be integrated and disposed on the display panel 110. Alternatively, each gate driver integrated circuit GDIC may be implemented as a chip on film (COF) method mounted on a film connected to the display panel 110.

[0027] The data driving circuit 130 can receive video data (DATA) from the controller 140 and convert the video data (DATA) into a data voltage in an analog format. The data driving circuit 130 can output a data voltage to each data line DL via the gate line GL in accordance with the timing at which the scan signal is applied. This allows each sub-pixel SP to express brightness according to the video data DATA.

[0028] The data driver circuit 130 may include one or more source driver integrated circuits (SDICs).

[0029] Each source driver integrated circuit SDIC may include a shift register, a latch circuit, a digital-to-analog converter, an output buffer, and the like.

[0030] Each source driver integrated circuit SDIC can be connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) method. Alternatively, each source driver integrated circuit SDIC can be directly disposed on the display panel 110. Alternatively, each source driver integrated circuit SDIC may be integrated and disposed on the display panel 110. Alternatively, each source driver integrated circuit SDIC can be realized by a chip on film (COF) method. In this case, each source driver integrated circuit SDIC can be mounted on a film coupled to the display panel 110 and electrically connected to the display panel 110 via wiring on the film.

[0031] The controller 140 can supply various control signals to the gate driving circuit 120 and the data driving circuit 130 to control the operations of the gate driving circuit 120 and the data driving circuit 130 .

[0032] The controller 140 may be mounted on a printed circuit board, a flexible printed circuit, or the like, and may be electrically connected to the gate driving circuit 120 and the data driving circuit 130 via the printed circuit board, a flexible printed circuit, or the like.

[0033] The controller 140 can cause the gate driving circuit 120 to output a scan signal according to the timing set for each frame, convert video data received from the outside to a data signal format used by the data driving circuit 130, and output the converted video data (DATA) to the data driving circuit 130.

[0034] The controller 140 can receive various timing signals including a vertical synchronization signal VSYNC, a horizontal synchronization signal HSYNC, an input data enable signal (DE: Data Enable), a clock signal CLK, and the like, together with the video data from an external source (eg, a host system).

[0035] The controller 140 can generate various control signals using various timing signals received from the outside, and output the generated control signals to the gate driving circuit 120 and the data driving circuit 130.

[0036] As an example, the controller 140 can output various gate control signals GCS including a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GOE), etc. to control the gate driving circuit 120.

[0037] The gate start pulse GSP can control the operation start timing of one or more gate driver integrated circuits GDIC constituting the gate drive circuit 120. The gate shift clock GSC is a clock signal commonly input to one or more gate driver integrated circuits GDIC, and can control the shift timing of the scan signal. The gate output enable signal GOE can specify timing information of one or more gate driver integrated circuits GDIC.

[0038] In addition, the controller 140 can output various data control signals DCS including a source start pulse (SSP), a source sampling clock (SSC), a source output enable signal (SOE), etc. to control the data driving circuit 130.

[0039] The source start pulse SSP can control the data sampling start timing of one or more source driver integrated circuits SDIC constituting the data driving circuit 130. The source sampling clock SSC is a clock signal that controls the data sampling timing in each of the source driver integrated circuits SDIC. The source output enable signal SOE can control the output timing of the data driving circuit 130.

[0040] The touch display device 100 may further include a power management integrated circuit (not shown) that supplies or controls various voltages or currents to the display panel 110, the gate driving circuit 120, the data driving circuit 130, etc.

[0041] Explaining a configuration for touch sensing in the touch display device 100, a touch drive circuit 200 can drive a plurality of touch electrodes TE arranged on the display panel 110. The touch drive circuit 200 can supply a touch drive signal to the touch electrodes TE and receive a touch sensing signal from the touch electrodes TE via touch lines TL.

[0042] The touch electrode TE may be located outside the display panel 110 or inside the display panel 110.

[0043] When the touch electrode TE is located inside the display panel 110, the touch electrode TE may be an electrode disposed separately from the electrodes for display driving. Alternatively, the touch electrode TE may be one of the electrodes for display driving. In one example, the touch electrode TE may include one of the pixel electrodes or a part of a common electrode used to display an image.

[0044] As an example, the touch electrode TE may be an electrode in which a common electrode (or a cathode electrode) for driving a display is divided and arranged. In this case, the touch electrode TE can perform the functions of an electrode for touch sensing and an electrode for driving a display.

[0045] As an example, the touch electrode TE can be driven as a common electrode with the touch electrode TE during periods divided in time (for example, a display driving period and a touch sensing period).

[0046] In such a case, a touch drive signal can be supplied to the touch electrode TE during a period in which touch sensing is performed. In a period distinct from the period in which touch sensing is performed, a voltage for display driving can be supplied to the touch electrode TE to perform display driving.

[0047] Alternatively, the touch electrode TE can simultaneously function as the touch electrode TE and the common electrode. In this case, since a touch drive signal is applied to the touch electrode TE during a display drive period, a signal for driving the display (e.g., a data voltage, a scan signal, etc.) can be supplied in a modulated form based on the touch drive signal. As an example, the touch drive signal may be modulated on top of a data voltage signal or a scan signal.

[0048] As described above, the touch drive circuit 200 can perform touch sensing by supplying a touch drive signal to the touch electrode TE during the display drive period or a period temporally divided from the display drive period.

[0049] The touch driving circuit 200 may convert the touch sensing signal into digital touch sensing data and then transmit the digital touch sensing data to the touch controller, which may detect whether or not a touch has occurred and the touch coordinates based on the touch sensing data.

[0050] Since the magnitude of the touch sensing signal may be small, the touch driving circuit 200 may integrate the touch sensing signal multiple times before converting the touch sensing signal into touch sensing data and output the integrated signal.

[0051] FIG. 2 is a diagram showing an example of a configuration of a touch drive circuit 200 included in the touch display device 100 according to an embodiment of the present disclosure.

[0052] Referring to FIG. 2, the touch drive circuit 200 may include a first charge regulator 210, a current regulator 220 and a conversion integrator 230.

[0053] The first charge amount regulator 210 may be electrically connected to a touch electrode TE disposed on the display panel 110 via a touch line TL. The first charge amount regulator 210 may adjust the charge amount of an input current received via the touch line TL.

[0054] For example, the first charge regulator 210 can adjust the charge of the input current based on the capacitance.

[0055] The first charge regulator 210 may receive a charge adjustment voltage VCR and may include at least one switch, a capacitor, etc. The first charge regulator 210 may adjust the charge of the input current received via the touch line TL according to the level of the charge adjustment voltage VCR and the operation of the switch, to remove noise from the input current or adjust the input current to an appropriate level for sensing the input current.

[0056] The input current whose charge has been adjusted by the first charge regulator 210 may be input to a current regulator 220 .

[0057] The current regulator 220 may receive an input current received via the touch line TL and a touch drive signal TDS. The current regulator 220 may adjust the magnitude of the input current received via the touch line TL to output a first current, which may be input to the conversion integrator 230 as a sensing current. Such a first current may also be referred to as a correction current.

[0058] The conversion integrator 230 may receive the sensing current whose magnitude has been adjusted by the current regulator 220 .

[0059] The conversion integrator 230 can convert the sensing current into a voltage and integrate it. The conversion integrator 230 can convert the sensing current into a voltage and output the integrated sensing voltage Vsen to the analog-digital converter. The touch sensing data in digital format converted by the analog-digital converter can be sent to the touch controller.

[0060] The conversion integrator 230 may include, for example, a plurality of integration switches SP1, SP2, SP3, SP4, SN1, SN2, SN3, SN4, an integration reset switch SRI, and at least one integration capacitor CP, CN, and may include an amplifier. An example of the structure and a driving method of the conversion integrator 230 will be described in detail later with reference to FIGS. 5 to 7.

[0061] The touch drive circuit 200 according to an embodiment of the present disclosure can provide a sensing voltage Vsen by integrating the magnitude of the input current received through the touch line TL using the current regulator 220 and then integrating it using the conversion integrator 230 through current-based integration.

[0062] The structure of the current regulator 220 included in the touch drive circuit 200 can be implemented in a variety of ways.

[0063] 3 and 4 are diagrams illustrating an example of the structure of the current regulator 220 included in the touch drive circuit 200 according to an embodiment of the present disclosure.

[0064] Referring to FIG. 3, an example of the structure of the current regulator 220 and the conversion integrator 230 included in the touch drive circuit 200 is shown.

[0065] The current regulator 220 may include, by way of example, an operational amplifier 221 , a current scaler 222 , and a power domain shifter 223 .

[0066] The operational amplifier 221 can include, for example, a plurality of transistors and at least one capacitor.

[0067] The operational amplifier 221 may be electrically connected to an IM terminal to which an input current received via a touch line TL is input. The operational amplifier 221 may be electrically connected to an IP terminal to which a touch drive signal TDS is input.

[0068] The operational amplifier 221 may be supplied with a high-potential voltage VDDH and a low-potential voltage VSSH. For example, the circuit elements included in the operational amplifier 221 may be circuit elements that operate in a high-voltage domain HV, and the high-potential voltage VDDH supplied to the operational amplifier 221 may be a voltage in the high-voltage domain HV.

[0069] The operational amplifier 221 is supplied with a high potential voltage VDDH and a low potential voltage VSSH, and can control the supply and release of current by a plurality of transistors.

[0070] The operational amplifier 221 may include a plurality of transistors PM1, PM2, ..., PM10 that control current sourcing, and a plurality of transistors NM1, NM2, ..., NM10 that control current sinking. One of fixed voltages BP1, BP2, BP3, BPX, BN1, BN2, BN3, BNX is applied to gate terminals of some of the plurality of transistors PM1, ..., PM10, NM1, ..., NM10, PM1, PM4 to PM9, NM1, NM4 to NM9, to control supply and discharge of a constant current. An input current input to an IM terminal may be applied to the gate terminals of the transistors PM2, NM2. A touch drive signal TDS input to an IP terminal may be applied to the gate terminals of the transistors PM3, NM3.

[0071] The current scaler 222 can adjust the magnitude of the current flowing through the operational amplifier 221 .

[0072] The current scaler 222 may include, for example, two transistors PM11 and NM11. The gate terminal of the transistor PM11 included in the current scaler 222 may be controlled by the same voltage PUP as the gate terminal of the transistor PM10 included in the operational amplifier 221. The gate terminal of the transistor NM11 included in the current scaler 222 may be controlled by the same voltage PDN as the gate terminal of the transistor NM10 included in the operational amplifier 221.

[0073] The ratio of the current flowing through the transistor PM10 to the current flowing through the transistor PM11 may be M:N. The ratio of the current flowing through the transistor NM10 to the current flowing through the transistor NM11 may be M:N. N may be smaller than M, and M:N may refer to the channel ratio of each transistor. The channel ratio may refer to the ratio of the channel width of the transistors PM10, NM10 to the channel width of the transistors PM11, NM11, as an example. Alternatively, the channel ratio may refer to the ratio of the channel width / length of the transistors PM10, NM10 to the channel width / length of the transistors PM11, NM11. The channel ratio may also refer to the ratio of one of the channel characteristics that affect the ratio of the current flowing through the transistors PM10, NM10 included in the operational amplifier 221 to the current flowing through the transistors PM11, NM11 included in the current scaler 222 in response to the same voltage applied to the gate terminals. By controlling the ratio of M:N, the magnitude of the current adjusted by the current scaler 222 can be controlled.

[0074] The magnitude of the current flowing through the operational amplifier 221 may be adjusted and provided to the power domain shifter 223 by transistors PM10, PM11, NM10, and NM11, which have gate terminals controlled by the same voltage.

[0075] The power domain shifter 223 may include a number of transistors PM12, PM13, PM14, and PM15 that control current sourcing, and a number of transistors NM12, NM13, NM14, and NM15 that control current sourcing.

[0076] The power domain shifter 223 may be supplied with a high potential voltage VCCA and a low potential voltage VSSA, and the high potential voltage VCCA may be a voltage in the low voltage domain LV. Also, the transistors PM14, PM15, NM14, and NM15 included in the power domain shifter 223 may be circuit elements that operate in the low voltage domain LV.

[0077] The power domain shifter 223 can convert the current in the high voltage domain HV to a current in the low voltage domain LV and supply it to the conversion integrator 230 .

[0078] It is possible to prevent the conversion integrator 230, which is made up of circuit elements in the low voltage domain LV, from being supplied with the current in the high voltage domain HV and not operating normally. In other words, the conversion integrator 230 can be supplied with the current in the low voltage domain LV in order to maintain good operation of the conversion integrator 230, thereby preventing or avoiding a fault or abnormal state that may be caused by the current in the high voltage domain HV. In one example, the current in the high voltage domain HV may shorten the life of the conversion integrator 230 or cause the conversion integrator 230 to fail early.

[0079] In this way, the current regulator 220, which is composed of the operational amplifier 221, the current scaler 222, and the power domain shifter 223, can supply a current in the low voltage domain LV, the magnitude of which is adjusted, to the conversion integrator 230. Supplying a low voltage current to the conversion integrator 230 can not only reduce power consumption, but also ensure normal operation and extend the lifespan.

[0080] The circuit structure included in the current regulator 220 may be embodied in various ways. For example, as shown in FIG. 4, a current conveyor 221' may be provided instead of the operational amplifier 221.

[0081] The input current received via touch line TL can be provided by current conveyor 221′, and each of transistors PM11, NM11 included in current scaler 222 can be arranged to have an M:N current ratio with transistors PM9, NM9 included in current conveyor 221′.

[0082] The current, adjusted in size by the current conveyor 221 ′ and the current scaler 222 , may be provided to the transform integrator 230 via the power domain shifter 223 .

[0083] In addition to the above examples, the circuit structure for transmitting the input current received via the touch line TL to the current scaler 222 can be implemented in a variety of ways.

[0084] The conversion integrator 230 may integrate the sensing current transmitted through the current scaler 222 and the power domain shifter 223, and output the sensing voltage Vsen.

[0085] Fig. 5 is a diagram showing an example of the structure of the conversion integrator 230 included in the touch drive circuit 200 according to an embodiment of the present disclosure. Fig. 6 and Fig. 7 are diagrams showing an example of a driving method of the conversion integrator 230 shown in Fig. 5. Fig. 8 is a diagram showing an example of the driving timing of the conversion integrator 230 shown in Fig. 5.

[0086] Referring to FIG. 5, the conversion integrator 230 may include a first integration block 231, a second integration block 232, and a gain buffer 233.

[0087] The first integration block 231 may be a block that integrates a sensing current Iin corresponding to a touch drive signal TDS having a first level (e.g., a high level) and a second level (e.g., a low level) in a section of the first level. The sensing current Iin may be a first current whose magnitude is adjusted and output by the current regulator 220.

[0088] The second integration block 232 may be a block that integrates the sensing current Iin in a second level section of the touch drive signal TDS. The gain buffer 233 may output a sensing voltage Vsen according to the integration by the first integration block 231 and the second integration block 232.

[0089] The first integration block 231 may include, for example, a first positive integration switch SP1, a second positive integration switch SP2, a third positive integration switch SP3, a fourth positive integration switch SP4, and a positive integration capacitor CP. The second integration block 232 may include, for example, a first negative integration switch SN1, a second negative integration switch SN2, a third negative integration switch SN3, a fourth negative integration switch SN4, and a negative integration capacitor CN.

[0090] In the first integration block 231, the first positive integration switch SP1 may be electrically connected to the input terminal of the sensing current Iin. The first positive integration switch SP1 may be electrically connected to a node between the third positive integration switch SP3, the fourth positive integration switch SP4, and the positive integration capacitor CP.

[0091] The second positive integration switch SP2 can be electrically connected between the input terminal of the integration reference voltage REFI and the positive integration capacitor CP.

[0092] In the second integration block 232, the first negative integration switch SN1 may be electrically connected to the input terminal of the sensing current Iin. The first negative integration switch SN1 may be electrically connected to a node between the second negative integration switch SN2 and the negative integration capacitor CN.

[0093] The second negative integral switch SN2 may be electrically connected to the input terminal of the integral reference voltage REFI. The third negative integral switch SN3 and the fourth negative integral switch SN4 may be electrically connected between the negative integral capacitor CN and the gain buffer 233.

[0094] An integral reset switch SRI can be electrically connected between the input end of the integral reference voltage REFI and the gain buffer 233. The integral reset switch SRI can be electrically connected to a node between the second positive integral switch SP2 and the second negative integral switch SN2.

[0095] The first integration block 231 and the second integration block 232 may integrate the sensing current Iin in a section where the touch drive signal TDS is at a first level and a section where the touch drive signal TDS is at a second level, respectively.

[0096] 6 shows an example of a method in which the first integration block 231 converts the sensing current Iin into a voltage and integrates it. FIG 6 shows an example of a case in which a charge amount X is accumulated in the negative integration capacitor CN of the second integration block 232 in the previous integration process.

[0097] 6 and 8, a section in which the level of the touch drive signal TDS is a first level (e.g., a high level) may include a first sensing period SenP1 and a second preset period PreP2.

[0098] In the first sensing period SenP1, the first positive integral switch SP1 and the second positive integral switch SP2 of the first integration block 231 may be turned on, and the third positive integral switch SP3 and the fourth positive integral switch SP4 may be turned off.

[0099] During the first sensing period SenP1, the second negative polarity integral switch SN2 and the fourth negative polarity integral switch SN4 of the second integration block 232 may be turned on, and the first negative polarity integral switch SN1 and the third negative polarity integral switch SN3 may be turned off.

[0100] In an interval in which the touch drive signal TDS is at a first level, the first positive integration switch SP1 is turned on, so that a charge may be stored in the positive integration capacitor CP by the sensing current Iin. A charge corresponding to Y may be stored in the positive integration capacitor CP.

[0101] Since the second positive integral switch SP2 is turned on, the voltage at one end of the positive integral capacitor CP becomes the integral reference voltage REFI, and the voltage at the other end of the positive integral capacitor CP becomes the integral reference voltage (REFI)+X+Y. The amount of charge stored in the positive integral capacitor CP may be X+Y.

[0102] During the second preset period PreP2, the first positive integral switch SP1 may be turned off and the fourth positive integral switch SP4 may be turned on. Also, the third negative integral switch SN3 of the second integration block 232 may be turned on. The integral reference voltage (REFI)+X+Y, which is the voltage of the positive integral capacitor CP, may become the voltage of one end of the negative integral capacitor CN via the fourth positive integral switch SP4, the (+) input terminal and (-) input terminal of the gain buffer 233, and the third negative integral switch SN3. An amount of charge corresponding to X+Y may be stored in the negative integral capacitor CN.

[0103] In an interval in which the level of the touch drive signal TDS is at a second level (eg, a low level), the second integration block 232 may perform integration.

[0104] 7 and 8, the section in which the level of the touch drive signal TDS is at the second level may include a second sensing period SenP2 and a first preset period PreP1.

[0105] In the second sensing period SenP2, the first negative integral switch SN1 and the third negative integral switch SN3 of the second integration block 232 may be turned on, and the second negative integral switch SN2 and the fourth negative integral switch SN4 may be turned off.

[0106] During the second sensing period SenP2, the second positive integral switch SP2 and the fourth positive integral switch SP4 of the first integration block 231 may be turned on, and the first positive integral switch SP1 and the third positive integral switch SP3 may be turned off.

[0107] Since the first negative integral switch SN1 is turned on and the second level touch drive signal TDS is applied, a current may be discharged through the input terminal of the sensing current Iin. When a current corresponding to the charge amount Z is discharged, since the second negative integral switch SN2 is turned off, the voltage of the node between the negative integral capacitor CN and the first negative integral switch SN1 may be the integral reference voltage (REFI)-Z.

[0108] Since the voltage of the node between the negative integration capacitor CN and the third negative integration switch SN3 is in a state of the integration reference voltage (REFI)+X+Y due to the integration of the first integration block 231, the amount of charge stored in the negative integration capacitor CN can be X+Y+Z, which is the difference between the voltages at both ends.

[0109] The integration operation by the first integration block 231 and the integration operation by the second integration block 232 may be performed in a plurality of intervals in which the level of the touch drive signal TDS changes between a first level and a second level, and the number of intervals in which the integration operation is performed may be controlled by the operation timing of the integration reset switch SRI. In one example, while the touch drive signal TDS goes back and forth between a high level and a low level (e.g., see FIG. 8), integration may be performed by the two integration blocks.

[0110] 8, the touch drive signal TDS is integrated during four first level intervals and four second level intervals, and the integration reset switch SRI is turned on during the integration reset period RstP to reset the first integration block 231 and the second integration block 232. In one example, the conversion integrator 230 can continue to perform integration for four periods before a signal corresponding to the integration reset period RstP is received, but the embodiments of the present disclosure are not limited thereto, and the integration time can be variously changed according to different settings.

[0111] In this way, each of the first integration block 231 and the second integration block 232 performs an operation of integrating a voltage corresponding to the sensing current Iin in a section where the touch drive signal TDS is at the first level and a section where the touch drive signal TDS is at the second level, and the gain buffer 233 can output a sensing voltage Vsen.

[0112] Moreover, depending on the circuit elements included in the touch drive circuit 200, the touch drive circuit 200 according to the embodiments of the present disclosure may not include some components, or may further include additional components.

[0113] 9 is a diagram showing another example of the structure of the touch drive circuit 200 according to an embodiment of the present disclosure. FIG. 10 is a diagram showing an example of the drive timing of the conversion integrator 230 included in the touch drive circuit 200 shown in FIG.

[0114] Referring to FIG. 9, an example of the structure of the current regulator 220 and the conversion integrator 230 included in the touch drive circuit 200 is shown.

[0115] The current regulator 220 may include an operational amplifier 221 and a current scaler 222. The circuit structure of the current regulator 220 may be the same as that described above through FIG.

[0116] The conversion integrator 230 may include a plurality of integration switches SP1, ..., SP4, SN1, ..., SN4, and at least one integration capacitor CP, CN. The circuit structure of the conversion integrator 230 may be the same as that described above through FIG.

[0117] The multiple integration switches SP1, . . . SP4, SN1, . . . , SN4 included in the first integration block 231 and the second integration block 232 of the conversion integrator 230 may be made of elements that operate in the high voltage region HV.

[0118] Since the switch included in the conversion integrator 230 is made of an element that operates in the high voltage domain HV, the power domain shifter 223 does not need to be disposed between the current scaler 222 of the current regulator 220 and the conversion integrator 230 (e.g., the power domain shifter 223 may be omitted).

[0119] The switches included in the first integration block 231 and the second integration block 232 of the conversion integrator 230 may be composed of switches operating in the high voltage domain HV, and the elements included in the gain buffer 233 may be composed of switches operating in the low voltage domain LV.

[0120] Therefore, the operation timing of some of the integral switches can be adjusted so that the current in the high voltage region HV does not affect the elements of the gain buffer 233 that operate in the low voltage region LV.

[0121] Referring to FIG. 10, the operation timing of the remaining integral switches except for the first positive polarity integral switch SP1 may be the same as the operation timing described above with reference to FIG.

[0122] The first positive integral switch SP1 may be turned on during the first sensing period SenP1 and turned off during the first preset period PreP1. The period during which the first positive integral switch SP1 is turned on may not overlap with the period during which the third positive integral switch SP3 is turned on. Thus, the length of the period during which the first positive integral switch SP1 is turned on may be shorter than the length of the period during which the first negative integral switch SN1 is turned on.

[0123] The first positive integral switch SP1 and the third positive integral switch SP3 may not be turned on at the same time by making the period when the first positive integral switch SP1 is turned on not overlap with the period when the third positive integral switch SP3 is turned on. By turning on the first positive integral switch SP1 and the third positive integral switch SP3 at the same time, it is possible to prevent the current of the high voltage domain HV from affecting the gain buffer 233 consisting of elements of the low voltage domain LV. In one example, in this case, the low voltage elements of the gain buffer 233 may be isolated or protected from the high voltage operation occurring in the current scaler 222 or the operational amplifier 221.

[0124] The circuit configuration that provides the sensing voltage Vsen through current-based scaling and integration may further include a configuration that adjusts the amount of charge based on the current.

[0125] 11 is a diagram showing another example of the configuration of the touch drive circuit 200 included in the touch display device 100 according to the embodiment of the present disclosure. FIG. 12 is a diagram showing an example of the drive timing of the touch drive circuit 200 shown in FIG.

[0126] Referring to FIG. 11, the touch drive circuit 200 may include a first charge regulator 210, a current regulator 220, a second charge regulator 240, and a conversion integrator 230.

[0127] The first charge regulator 210 may be connected to the input end of the current regulator 220 and may adjust the charge of the input current received through the touch line TL based on the capacitance.

[0128] The second charge regulator 240 may be electrically connected between the current regulator 220 and the conversion integrator 230. The second charge regulator 240 may adjust the charge of the first current output by the current regulator 220 on a current basis to output a second current. The second current output by the second charge regulator 240 may be input to the conversion integrator 230 as a sensing current Iin.

[0129] The second charge regulator 240 can be implemented in various ways, and as an example, can include a current supply unit, a current removal unit, a first charge regulator switch CRSWP, and a second charge regulator switch CRSWN.

[0130] The current supply unit is, for example, composed of a transistor CRP having a gate terminal to which a constant voltage BP is applied, and can supply a constant current to one end of the first charge adjustment switch CRSWP. The amount of the second current output via the second charge regulator 240 can be increased according to the operation of the first charge adjustment switch CRSWP.

[0131] The current removal unit is, for example, composed of a transistor CRN to which a constant voltage BN is applied at the gate terminal, and a constant current can be discharged from one end of the second charge adjustment switch CRSWN. The amount of the second current output through the second charge regulator 240 can be reduced by the operation of the second charge adjustment switch CRSWN.

[0132] The operation timing of the first charge amount adjustment switch CRSWP and the operation timing of the second charge amount adjustment switch CRSWN can be set in various ways according to the amount of current to be adjusted by the second charge amount adjuster 240.

[0133] For example, the first charge adjustment switch CRSWP may be turned on during the second sensing period SenP2 and turned off during the remaining period, and the second charge adjustment switch CRSWN may be turned on during the first sensing period SenP1 and turned off during the remaining period.

[0134] The length of the period during which each of the first charge amount adjustment switch CRSWNP and the second charge amount adjustment switch CRSWN is turned on may be smaller than the pulse width of the touch drive signal TDS.

[0135] In addition, the amount of current regulated by the second charge regulator 240 can be controlled by adjusting the length of the period during which the first charge regulator switch CRSWP and the second charge regulator switch CRSWN are turned on.

[0136] If the amount of current output from the current regulator 220 is not sufficiently reduced, the second charge regulator 240 can adjust the amount of current to adjust the magnitude of the sensing current Iin input to the conversion integrator 230 to an appropriate magnitude. In this case, the conversion integrator 230 can be supplied with the input sensing current Iin having an appropriate amplitude that matches the operation specifications of the conversion integrator 230, which can extend the life of the conversion integrator 230 and reduce unnecessary power consumption. In other words, the current input to the conversion integrator 230 can be finely matched and adjusted so that the conversion integrator 230 operates at the best performance and in an optimal state.

[0137] The above-described embodiment of the present disclosure can be briefly described as follows.

[0138] A touch display device according to an embodiment of the present disclosure may include a plurality of touch electrodes arranged on a display panel, and a touch drive circuit that drives the plurality of touch electrodes and outputs a touch drive signal including a first level section and a second level section.

[0139] The touch drive circuit may include a current regulator that outputs a first current that reduces a magnitude of an input current received from at least one of the plurality of touch electrodes during at least a portion of a section in which the touch drive signal is at a first level and a section in which the touch drive signal is at a second level, and a conversion integrator that integrates a voltage corresponding to the first current or a second current adjusted from the first current at least once to output a sensing voltage.

[0140] The conversion integrator may include a first integration block that integrates a voltage corresponding to a first current or a second current over at least a portion of the section in which the touch drive signal is at a first level, a second integration block that integrates a voltage corresponding to the first current or the second current over at least a portion of the section in which the touch drive signal is at the second level, and a gain buffer that outputs a sensing voltage based on the voltage integrated by the first integration block and the second integration block.

[0141] The first integration block may include a first positive integration switch electrically connected to an input end of the first current or the second current, and a positive integration capacitor electrically connected between the first positive integration switch and an input end of an integration reference voltage.

[0142] The second integration block may include a negative integration capacitor and a first negative integration switch electrically connected to the input end of the first current or the second current and electrically connected to a node between the negative integration capacitor and the input end of the integration reference voltage.

[0143] The first positive integral switch and the first negative integral switch can be turned on alternately with each other.

[0144] The length of the period during which at least one of the first positive integral switch and the first negative integral switch is turned on may be the same as a pulse width of the touch drive signal.

[0145] The section in which the touch drive signal is at the first level includes a first sensing period and a second preset period, and the period in which the first positive polarity integral switch is turned on may overlap with the first sensing period but may not overlap with the second preset period.

[0146] The section in which the touch drive signal is at the second level includes a second sensing period and a first preset period, and the period in which the first negative polarity integral switch is turned on may overlap with the second sensing period but may not overlap with the first preset period.

[0147] The first integration block may include a second positive integration switch electrically connected between the positive integration capacitor and the input terminal of the integration reference voltage, and the second integration block may include a second negative integration switch electrically connected between the negative integration capacitor and the input terminal of the integration reference voltage.

[0148] During the period in which the second positive integral switch maintains its turned-on state, the second negative integral switch can alternate between a period in which it is turned-on and a period in which it is turned-off.

[0149] The length of time that the second negative polarity integrating switch is in a turned-on state may be greater than the length of time that the second negative polarity integrating switch is in a turned-off state.

[0150] The converting integrator may further include an integral reset switch electrically connected between a node between the second positive integral switch and the second negative integral switch and the gain buffer.

[0151] The circuit elements included in the first integration block and the second integration block may be circuit elements for high voltage, and the circuit elements included in the gain buffer may be circuit elements for low voltage. In this case, the length of the period during which the first positive integration switch is turned on may be shorter than the length of the period during which the first negative integration switch is turned on.

[0152] The current regulator may further include a power domain shifter electrically connected to the input of the converter integrator to convert the first current from a high-voltage domain current to a low-voltage domain current.

[0153] The touch drive circuit may further include a first charge regulator electrically connected to the input end of the current regulator, which adjusts the charge amount of the input current through capacitance adjustment, and a second charge regulator electrically connected between the current regulator and the conversion integrator, which adjusts the charge amount of the first current through current adjustment to output a second current.

[0154] The second charge regulator may include a current supply section, a current removal section, a first charge regulation switch electrically connected between a node between the current regulator and the conversion integrator and the current supply section, and a second charge regulation switch electrically connected between a node between the current regulator and the conversion integrator and the current removal section.

[0155] The length of a period during which each of the first charge amount adjustment switch and the second charge amount adjustment switch is turned on once may be shorter than a pulse width of the touch drive signal.

[0156] The period in which the first charge amount adjustment switch or the second charge amount adjustment switch is turned on may overlap with either the section in which the touch drive signal is at the first level or the section in which the touch drive signal is at the second level, but may not overlap with the other one.

[0157] A touch drive circuit according to an embodiment of the present disclosure may include a current regulator that outputs a correction current that reduces the magnitude of an input current received from a touch electrode to which a touch drive signal including a first level section and a second level section is applied, and a conversion integrator that integrates a voltage corresponding to the correction current in each of a section in which the touch drive signal is at the first level and a section in which the touch drive signal is at the second level, to output a sensing voltage.

[0158] A conversion integrator according to an embodiment of the present disclosure may include a first integration block including a first positive integration switch electrically connected to an input end of a sensing current and a positive integration capacitor electrically connected between the first positive integration switch and an input end of an integration reference voltage, and integrating a voltage corresponding to a sensing current input in a section where the touch drive signal is at a first level, a second integration block including a negative integration capacitor and a first negative integration switch electrically connected between a node between the negative integration capacitor and the input end of the integration reference voltage and the input end of the sensing current, and integrating a voltage corresponding to a sensing current input in a section where the touch drive signal is at a second level, and a gain buffer that outputs a sensing voltage based on the voltage integrated by the first integration block and the second integration block.

[0159] The above description is merely an illustrative example of the technical idea of ​​the present disclosure, and a person having ordinary knowledge in the technical field to which the present disclosure belongs may make various modifications and variations without departing from the essential characteristics of the present disclosure. Furthermore, the embodiments shown in the present disclosure are for the purpose of explanation and do not limit the technical idea of ​​the present disclosure, and therefore the scope of the technical idea of ​​the present disclosure is not limited by these embodiments.

Claims

1. A touch display device, comprising: A plurality of touch electrodes disposed on the display panel; and a touch driving circuit for driving the touch electrodes and outputting a touch driving signal including a section having a first level and a section having a second level; The touch driving circuit includes: a current regulator that outputs a first current obtained by reducing a magnitude of an input current received from at least one of the plurality of touch electrodes during at least a portion of a section in which the touch drive signal has the first level and a section in which the touch drive signal has the second level; and a conversion integrator that integrates the first current or a voltage corresponding to a second current adjusted from the first current at least once to output a sensing voltage; The transform integrator comprises: a first integration block that integrates a voltage corresponding to the first current or the second current during at least a portion of a section in which the touch drive signal is at the first level; a second integration block that integrates a voltage corresponding to the first current or the second current during at least a portion of a period during which the touch drive signal is at the second level; and a gain buffer that outputs the sensing voltage based on a voltage integrated by the first integration block and the second integration block.

2. The first integration block comprises: a first positive polarity integral switch electrically connected to the first current input or the second current input; and The touch display device according to claim 1 , further comprising a positive integration capacitor electrically connected between the first positive integration switch and an input terminal of an integration reference voltage.

3. The second integration block comprises: A negative integration capacitor; and 3. The touch display device of claim 2, further comprising: a first negative integral switch electrically connected to the input end of the first current or the second current and electrically connected to a node between the negative integral capacitor and the input end of the integral reference voltage.

4. The touch display device of claim 3 , wherein the first positive polarity integral switch and the first negative polarity integral switch are turned on alternately with each other.

5. The touch display device of claim 3 , wherein a length of a period during which at least one of the first positive polarity integral switch and the first negative polarity integral switch is turned on is the same as a pulse width of the touch drive signal.

6. The section in which the touch drive signal is at the first level includes a first sensing period and a second preset period, The touch display device of claim 3 , wherein a period during which the first positive polarity integral switch is turned on overlaps with the first sensing period and does not overlap with the second preset period.

7. The section in which the touch drive signal is at the second level includes a second sensing period and a first preset period, The touch display device of claim 3 , wherein a period during which the first negative polarity integral switch is turned on overlaps with the second sensing period and does not overlap with the first preset period.

8. the first integration block includes a second positive integration switch electrically connected between the positive integration capacitor and the integration reference voltage input; the second integration block includes a second negative integration switch electrically connected between the negative integration capacitor and the integration reference voltage input; 4. The touch display device of claim 3, wherein during a period in which the second positive integral switch maintains its turned-on state, a period in which the second negative integral switch is turned-on and a period in which the second negative integral switch is turned-off are repeated.

9. The touch display device of claim 8 , wherein a length of a period during which the second negative polarity integral switch is in a turned-on state is greater than a length of a period during which the second negative polarity integral switch is in a turned-off state.

10. The transform integrator comprises: The touch display device of claim 8 , further comprising an integration reset switch electrically connected between the gain buffer and a node between the second positive integration switch and the second negative integration switch.

11. The touch display device according to claim 3 , wherein the circuit elements included in the first integration block and the second integration block are circuit elements for high voltage, and the circuit elements included in the gain buffer are circuit elements for low voltage.

12. The touch display device of claim 11 , wherein a length of a period during which the first positive integral switch is turned on is less than a length of a period during which the first negative integral switch is turned on.

13. A touch display device, comprising: A plurality of touch electrodes disposed on the display panel; and a touch driving circuit for driving the touch electrodes and outputting a touch driving signal including a section having a first level and a section having a second level; The touch driving circuit includes: a current regulator that outputs a first current obtained by reducing a magnitude of an input current received from at least one of the plurality of touch electrodes during at least a portion of a section in which the touch drive signal has the first level and a section in which the touch drive signal has the second level; and a conversion integrator that integrates the first current or a voltage corresponding to a second current adjusted from the first current at least once to output a sensing voltage; The current regulator comprises: The touch display device further includes a power domain shifter electrically connected to an input end of the conversion integrator, the power domain shifter converting the first current from a current in a high voltage domain to a current in a low voltage domain.

14. A touch display device, comprising: A plurality of touch electrodes disposed on the display panel; and a touch driving circuit for driving the touch electrodes and outputting a touch driving signal including a section having a first level and a section having a second level; The touch driving circuit includes: a current regulator that outputs a first current obtained by reducing a magnitude of an input current received from at least one of the plurality of touch electrodes during at least a portion of a section in which the touch drive signal has the first level and a section in which the touch drive signal has the second level; and a conversion integrator that integrates the first current or a voltage corresponding to a second current adjusted from the first current at least once to output a sensing voltage; The touch driving circuit includes: a first charge regulator electrically connected to the input of the current regulator and configured to adjust the charge of the input current through capacitance adjustment; and The touch display device further includes a second charge regulator electrically connected between the current regulator and the conversion integrator, for adjusting the charge amount of the first current by adjusting the current amount, and outputting the second current.

15. The second charge regulator comprises: Current supply section; Current removal section; a first charge regulation switch electrically connected between the current supply and a node between the current regulator and the converter integrator; and The touch display device of claim 14 further comprising a second charge regulation switch electrically connected between the node between the current regulator and the converter integrator and the current removal portion.

16. The touch display device of claim 15 , wherein a length of a period during which each of the first charge amount adjustment switch and the second charge amount adjustment switch is turned on once is smaller than a pulse width of the touch drive signal.

17. 16. The touch display device of claim 15, wherein a period in which the first charge amount adjustment switch or the second charge amount adjustment switch is turned on overlaps with either a section in which the touch drive signal is at the first level or a section in which the touch drive signal is at the second level, but does not overlap with the other one.

18. A touch drive circuit, comprising: a current regulator that outputs a correction current that reduces the magnitude of an input current received from a touch electrode to which a touch drive signal including a first level section and a second level section is applied; and a conversion integrator that integrates a voltage according to the correction current in each of a section in which the touch driving signal is at the first level and a section in which the touch driving signal is at the second level, and outputs a sensing voltage; The transform integrator comprises: a first integration block that integrates a voltage according to the correction current during at least a portion of a section in which the touch drive signal is at the first level; a second integration block that integrates a voltage according to the correction current during at least a portion of a section in which the touch drive signal is at the second level; and a touch drive circuit including: a gain buffer that outputs the sensing voltage based on a voltage integrated by the first integration block and the second integration block.

19. a first integration block including a first positive integration switch electrically connected to an input terminal of a sensing current and a positive integration capacitor electrically connected between the first positive integration switch and an input terminal of an integration reference voltage, the first integration block integrating a voltage according to the sensing current input during an interval in which the touch drive signal is at a first level; a second integration block including a negative integration capacitor and a first negative integration switch electrically connected between a node between the negative integration capacitor and the input end of the integration reference voltage and the input end of the sensing current, the second integration block integrating a voltage according to the sensing current input in an interval in which the touch drive signal is at a second level; and a conversion integrator including a gain buffer that outputs a sensing voltage based on a voltage integrated by the first integration block and the second integration block;

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