Touch sensing display device

Abstract

There is provided a touch sensing display device including: a display panel including a plurality of touch blocks divided into at least one active touch block and at least one passive touch block with respect to a touch input position, each touch block being provided with a plurality of touch nodes; and a plurality of sensing circuits configured to fully sense touch nodes of the active touch block at a first time corresponding to an entire pulse period of the touch driving signal, and to half-sense touch nodes of the passive touch block at a second time based on the touch driving signal, the first time corresponding to the entire pulse period of the touch driving signal, and the second time corresponding to the entire pulse period of the touch driving signal. And the second time corresponds to an odd pulse period or an even pulse period of the touch driving signal.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2024 - 0010819, filed on January 24, 2024, which is incorporated herein by reference in its entirety as if fully set forth herein. Technical Field

[0003] The present disclosure relates to a touch - sensing display device. Background Art

[0004] A touch - sensing display device can recognize a touch input applied to a display panel and can perform various application functions based thereon.

[0005] A touch - sensing display device may include a plurality of touch nodes provided in the display panel for touch recognition, and a touch circuit for driving the touch nodes. The touch circuit may supply a touch driving signal to the touch nodes and may detect the charge amount of the touch nodes based on the touch driving signal to calculate touch coordinates corresponding to the touch input.

[0006] In such a touch - sensing display device, since touch sensing is performed on all touch nodes every time regardless of where the touch input currently appears, it is impossible to perform low - power driving and it is difficult to reduce power consumption. Summary of the Invention

[0007] To overcome the above problems of the related art, the present disclosure may provide a touch - sensing display device capable of reducing power consumption.

[0008] To achieve these and other advantages and in accordance with the purpose of the present disclosure, as embodied and broadly described herein, a touch - sensing display device includes: a display panel including a plurality of touch blocks, the plurality of touch blocks being divided into at least one active touch block and at least one passive touch block with respect to a touch input position, each touch block being provided with a plurality of touch nodes; and a plurality of sensing circuits configured to perform full sensing on the touch nodes of the active touch blocks at a first time based on a touch driving signal and perform half - sensing on the touch nodes of the passive touch blocks at a second time, wherein the first time corresponds to an entire pulse period of the touch driving signal, and the second time corresponds to an odd - numbered pulse period or an even - numbered pulse period of the touch driving signal. Brief Description of the Drawings

[0009] The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0010] Figure 1 is a diagram schematically showing a touch sensing display device according to the present disclosure;

[0011] Figure 2 is a diagram showing a matching configuration between a touch circuit and touch blocks according to the present disclosure;

[0012] Figure 3 is a diagram showing some elements of a touch circuit according to the present disclosure;

[0013] Figure 4 is a diagram showing an example of time - division sensing of multiple touch blocks based on a channel multiplexer signal;

[0014] Figure 5 is a diagram showing a configuration of a sensing circuit individually connected to each touch node of a touch block;

[0015] Figure 6 is a diagram for describing a touch sensing operation of one sensing circuit;

[0016] Figure 7 is a diagram showing an example in which an active touch block and a passive touch block are distinguished from each other with respect to a touch input position;

[0017] Figure 8A is a diagram showing a half - sensing operation of an odd - numbered sensing circuit that is energized only during odd - numbered pulse periods of a touch drive signal;

[0018] Figure 8B is a diagram showing odd - numbered touch nodes of a passive touch block that is connected to an odd - numbered sensing circuit and is half - sensed;

[0019] Figure 9A is a diagram showing a half - sensing operation of an even - numbered sensing circuit that is energized only during even - numbered pulse periods of a touch drive signal;

[0020] Figure 9B is a diagram showing even - numbered touch nodes of a passive touch block that is connected to an even - numbered sensing circuit and is half - sensed;

[0021] Figure 10 is a diagram showing an overall circuit of the present disclosure for amplifying a half - sensed output by two times;

[0022] Figure 11A is a diagram showing a full - sensing operation of a sensing circuit that is energized during the entire pulse period of a touch drive signal;

[0023] Figure 11B is a diagram showing all touch nodes of an active touch block that is connected to a sensing circuit and is fully sensed;

[0024] Figure 12It is a diagram showing the detailed configuration of a sensing circuit;

[0025] Figure 13 It is a diagram showing an example in which the first switch and the second switch of a sensing circuit are energized only during the odd pulse period of the touch driving signal by the first switch control signal;

[0026] Figure 14 It is a diagram showing an example in which the first switch and the second switch of a sensing circuit are energized only during the even pulse period of the touch driving signal by the second switch control signal;

[0027] Figure 15 It is a diagram showing an example in which the first switch and the second switch of a sensing circuit are energized during the entire pulse period of the touch driving signal by the third switch control signal; and

[0028] Figure 16 It is a diagram showing the sensing sequence according to the present disclosure. Detailed Description

[0029] Hereinafter, the present disclosure will be described more fully with reference to the accompanying drawings in which exemplary embodiments of the present disclosure are shown. However, the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the present disclosure to those skilled in the art.

[0030] The advantages and features of the present disclosure and the method of realizing the same will be clarified by the embodiments described below with reference to the drawings. However, the present disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. In addition, the present disclosure is defined only by the scope of the claims.

[0031] In the drawings disclosed for describing the various embodiments for describing the embodiments of the present disclosure, the shapes, sizes, ratios, angles, numbers, etc. are merely exemplary, and the present disclosure is not limited thereto. Like reference numerals always refer to like elements. Throughout this specification, the same elements are denoted by the same reference numerals. As used herein, unless the term "only" is used, the terms "comprising", "having", "including", etc. imply that other components may be added. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0032] Even if not explicitly stated, elements in various embodiments of the present disclosure are interpreted to include a margin of error.

[0033] When describing a positional relationship, for example, when the positional relationship between two parts is described as "on...", "above...", "below...", and "next to...", unless "exactly" or "directly" is used, one or more other components may be provided between these two parts.

[0034] It will be understood that although terms such as "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present disclosure, the first element may represent the second element, and similarly, the second element may represent the first element.

[0035] In the following description, when a detailed description of a related known function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0036] Figure 1 is a diagram schematically showing a touch sensing display device 100 according to the present disclosure.

[0037] Referring to Figure 1 , the touch sensing display device 100 according to the present disclosure can provide a display function of reproducing an input image on its screen and a touch sensing function of sensing a touch input of a user.

[0038] The touch sensing display device 100 may include a display panel 110 that provides a plurality of data lines DL and a plurality of gate lines GL, a display driving circuit for driving the display panel 110, and a timing controller 140.

[0039] Functionally, the display driving circuit may be divided into a gate driving circuit 120 for driving the gate lines GL and a data driving circuit 130 for driving the data lines DL. The display driving circuit may be implemented as one or more integrated circuits (ICs).

[0040] The display panel 110 may include an active area AA that provides a plurality of sub-pixels SP and a non-active area NA provided outside the active area AA. Each of the plurality of touch nodes TN may be provided in a region corresponding to two or more sub-pixels SP. The touch node TN may be referred to as a touch electrode.

[0041] A plurality of data lines DL and a plurality of gate lines GL may be provided in the display panel 110, and sub-pixels SP may be provided in regions defined by intersections between the data lines DL and the gate lines GL. A plurality of touch lines TL electrically connected to the plurality of touch nodes TN may also be provided in the display panel 110.

[0042] First, elements for display driving in the touch sensing display device 100 will be described below.

[0043] The gate driving circuit 120 may be controlled by the timing controller 140, and may sequentially output scan signals to the plurality of gate lines GL provided in the display panel 110 to control the driving timing of each of the plurality of sub-pixels SP.

[0044] The gate driving circuit 120 may include one or more gate driver integrated circuits (GDICs), and based on the driving type, the GDICs may be provided on only one side of the display panel 110 or on both sides of the display panel 110.

[0045] Each of the GDICs may be connected to bonding pads of the display panel 110 in a tape automated bonding (TAB) type or a chip on glass (COG) type. Alternatively, each GDIC may be implemented as an in-panel gate (GIP) type and may be directly provided in the display panel 110. Alternatively, each GDIC may be integrated and provided in the display panel 110. Alternatively, each GDIC may be implemented as a chip on film (COF) type mounted on a film connected to the display panel 110.

[0046] The data driving circuit 130 may receive image data from the timing controller 140, and may convert the image data into an analog data voltage. The data driving circuit 130 may output the data voltage to the data lines DL in synchronization with the timing of applying scan signals through the gate lines GL, and thus may allow the sub-pixels SP to achieve brightness based on the image data.

[0047] The data driving circuit 130 may include one or more source driver integrated circuits (SDICs). Each of the SDICs may include a shift register, a latch circuit, a digital-to-analog converter (DAC), and an output buffer.

[0048] Each SDIC may be connected to bonding pads of the display panel 110 in a TAB type or a COG type. Alternatively, each SDIC may be directly provided in the display panel 110. Alternatively, each SDIC may be integrated and provided in the display panel 110. Alternatively, each SDIC may be implemented as a COF type. In this case, each SDIC may be mounted on a film connected to the display panel 110, and may be electrically connected to the display panel 110 through lines of the film.

[0049] The timing controller 140 may supply various control signals to the gate driving circuit 120 and the data driving circuit 130, and may control the operation timings of the gate driving circuit 120 and the data driving circuit 130.

[0050] The timing controller 140 may be mounted on a printed circuit board (PCB) or a flexible PCB, and may be electrically connected to the gate driving circuit 120 and the data driving circuit 130 through the PCB or the FPCB.

[0051] The timing controller 140 may allow the gate driving circuit 120 to output scan signals based on timings set in each frame, and may allow the data driving circuit 130 to convert image data into data voltages and output the data voltages in synchronization with the scan signals.

[0052] The timing controller 140 may receive various timing signals including a vertical synchronization signal VSYNC, a horizontal synchronization signal HSYNC, an input data enable signal DE, and a clock signal CLK, as well as image data, from the outside (e.g., a host system).

[0053] The timing controller 140 may generate a gate control signal GCS and a data control signal DCS by using various timing signals received from the outside, may output the gate control signal GCS to the gate driving circuit 120, and may output the data control signal DCS to the data driving circuit 130.

[0054] The gate control signal GCS may include a gate start pulse GSP, a gate shift clock GSC, and a gate output enable signal GOE. The gate start pulse GSP may control the operation start timings of each of one or more GDICs configuring the gate driving circuit 120. The gate shift clock GSC may be a clock signal commonly input to one or more GDICs and may control the shift timings of the scan signals. The gate output enable signal GOE may control the output timings of each of one or more GDICs.

[0055] The data control signal DCS may include a source start pulse SSP, a source sampling clock SSC, and a source output enable signal SOE. The source start pulse SSP may control the data sampling start timings of each of one or more SDICs configuring the data driving circuit 130. The source sampling clock SSC may be a clock signal controlling the sampling timings of data in each SDIC. The source output enable signal SOE may control the output timings of the data driving circuit 130.

[0056] The touch sensing display device 100 may further include a power management IC that supplies various voltages or currents to the display panel 110, the gate driving circuit 120, and the data driving circuit 130, or controls the various voltages or currents to be supplied.

[0057] Hereinafter, the elements for touch sensing driving in the touch sensing display device 100 will be described.

[0058] The touch sensing display device 100 may include a touch screen panel provided with a plurality of touch nodes TN for touch sensing, and a touch circuit 200 that drives and senses the touch screen panel.

[0059] The touch screen panel may be an external type in which the touch screen panel is manufactured independently of the display panel 110 and bonded to the display panel 110, or may be an internal type in which the touch screen panel is manufactured together in the manufacturing process of the display panel 110 and disposed in the display panel 110. In the touch sensing display device 100 according to the present disclosure, the touch screen panel may be an independent panel including a touch sensing function, or may represent the display panel 110 having all touch sensing functions and display functions. Hereinafter, for example, the internal type of the touch screen panel in the display panel 110 will be described.

[0060] The touch circuit 200 may drive and sense a plurality of touch nodes TN provided in the display panel 100. The touch circuit 200 may supply a touch driving signal to the touch nodes TN, may receive and accumulate a touch sensing signal from the touch nodes TN, and may detect a touch coordinate and the presence or absence of a touch based on the touch sensing accumulated signal. The touch circuit 200 may be implemented as one element or two or more elements (e.g., an IC), and may be implemented independently of the display driving circuit. In addition, all or part of the touch circuit 200 may be integrated and implemented in the display driving circuit or its internal circuit. For example, a part of the touch circuit 200 may be implemented as an IC together with the data driving circuit 130.

[0061] The touch node TN may be an electrode provided by dividing a common electrode for display driving. In this case, the touch node TN may perform the function of an electrode for touch sensing and the function of an electrode for display sensing.

[0062] The touch circuit 200 may supply a touch driving signal to the touch nodes TN in a display driving period or a touch driving period divided in time to perform touch sensing.

[0063] Figure 2 It is a diagram showing a matching configuration between the touch circuit 200 and the touch block according to the present disclosure.

[0064] Refer toFigure 2 According to the present disclosure, the touch circuit 200 may include a microcontroller unit (MCU) and a readout integrated circuit (ROIC).

[0065] The display panel 110 may be divided into a plurality of columns in the X-axis direction to correspond to a plurality of ROICs, and may be divided into a plurality of rows in the Y-axis direction to correspond to a plurality of channel multiplexers CMUX0 to CMUX9. Each channel multiplexer may select a touch block TBLK of a corresponding row. Each ROIC may drive and sense the touch block TBLK selected by the channel multiplexer from the touch blocks TBLK of the corresponding row.

[0066] Each touch block TBLK may include a plurality of touch nodes TN. Each of the plurality of touch nodes TN may be connected to a touch line TL. The number of touch lines TL may be equal to the number of touch nodes TN. The touch line TL may be connected to the sensing circuit ( Figure 3 of the SSU) of the ROIC through a selected channel multiplexer.

[0067] The sensing circuit ( Figure 3 of the SSU) of the ROIC may be connected to one of the touch blocks TBLK of the corresponding row through one of the plurality of channel multiplexers CMUX0 to CMUX9. For example, the sensing circuit ( Figure 3 of the SSU) of the ROIC may be selectively connected to the touch block TBLK of the first row through the channel multiplexer CMUX0 and may be selectively connected to the touch block TBLK of the second row through the channel multiplexer CMUX1. Similarly, the sensing circuit ( Figure 3 of the SSU) of the ROIC may be selectively connected to the touch block TBLK of the tenth row through the channel multiplexer CMUX9.

[0068] Figure 3 is a diagram showing some elements of the touch circuit 200 according to the present disclosure.

[0069] Referring to Figure 3 , the ROIC may include a sensing circuit SSU for separately sensing the touch nodes TN included in one touch block TBLK each time when one channel multiplexer CMUX operates. The number of sensing circuits SSU may correspond to the number of touch lines TL, or may correspond to the number of touch nodes TN.

[0070] Each of the sensing circuits SSU may include a preamplifier circuit PAMP, an integration circuit ITG, and a sample and hold circuit SHA. The preamplifier circuit PAMP and the integration circuit ITG may accumulate touch sensing signals of the connected touch nodes TN based on touch drive signals. The sample and hold circuit SHA may store and output the finally accumulated touch sensing accumulated signals.

[0071] Multiple touch sensing accumulated signals output from the sensing circuits SSU may be sequentially selected one by one through an output multiplexer MUX, and then may be input to an ADC. The ADC may convert the touch sensing accumulated signals input through the output multiplexer MUX into digital values, and may store the converted touch sensing data in a buffer memory SBUF.

[0072] The MCU and the ROIC may be connected to each other through a serial peripheral interface (SPI), and may transmit and receive related control signals and touch sensing data therebetween. In the SPI communication scheme, the MCU may be a master device, and the ROIC may be a slave device. The MCU may include a master SPI port M-SPI, and the ROIC may include a slave SPI port S-SPI. The master SPI port M-SPI and the slave SPI port S-SPI may be connected to each other through multiple transmission lines.

[0073] The MCU may calculate touch coordinates corresponding to a touch input position based on the touch sensing data. The MCU may store the touch coordinate values in an internal memory SRAM.

[0074] Figure 4 is a diagram showing an example of sequentially selecting multiple touch blocks one by one and sensing them time-divisionally based on a channel multiplexer.

[0075] Referring to Figure 4 , the touch sensing operation and the display operation may be time-divided with respect to a touch synchronization signal TSYNC. The touch sensing operation may correspond to a low period L of the touch synchronization signal TSYNC. The display operation may correspond to a high period H of the touch synchronization signal TSYNC. The touch synchronization signal TSYNC may be generated by the MCU, and then may be transmitted to the ROIC through SPI communication.

[0076] The sensing circuit SSU of the ROIC may be activated during an operation in the low period L of the touch synchronization signal TSYNC. During the low period L of the touch synchronization signal TSYNC, the sensing circuit SSU of the ROIC may be sequentially connected to one of the touch blocks TBLK in the corresponding column through channel multiplexers CMUX0 to CMUX9 and may sequentially sense the touch blocks TBLK in the corresponding column.

[0077] Figure 5It is a diagram showing the configuration of a sensing circuit for each touch node individually connected to a touch block. Figure 6 It is a diagram for describing the touch sensing operation of one sensing circuit.

[0078] Referring to Figure 5 and Figure 6 , the touch nodes of the touch block selected by the channel multiplexer CMUX can be connected to one sensing circuit SSU. One sensing circuit SSU can supply a touch drive signal PWM_TX to the touch nodes and can accumulate the touch sensing signals obtained from the touch nodes based on the pulse period T of the touch drive signal PWM_TX. The accumulation operation of the touch sensing signals can be performed by a preamplifier circuit PAMP and an integration circuit ITG. The preamplifier circuit PAMP and the integration circuit ITG can be powered on by a power-on control signal SSU_PW and can perform the accumulation operation on the touch sensing signals.

[0079] Figure 7 It is a diagram showing an example in which an active touch block and a passive touch block are distinguished from each other with respect to the touch input position.

[0080] Referring to Figure 7 , a plurality of touch blocks TBLK can be divided into an active touch block En-TBLK and a passive touch block Dis-TBLK. Here, the touch input position can be obtained in advance by pre-sensing all the plurality of touch blocks TBLK. The pre-sensing can represent full-node sensing of all the touch nodes included in each of the plurality of touch blocks TBLK.

[0081] The active touch block En-TBLK can be a touch block including the touch input position checked by pre-sensing and can represent an area where touch inputs occur continuously.

[0082] The passive touch block Dis-TBLK can be a touch block not including the touch input position obtained by pre-sensing and can represent an area where it is estimated that no touch input exists.

[0083] As in Figure 7 , when the touch input position checked by pre-sensing corresponds to ROIC2 in the column direction and to CMUX4 to CMUX5 in the row direction, based on the touch drive signal, the sensing circuit of ROIC2 can perform full sensing on the touch nodes included in the active touch block En-TBLK for a first time and can perform half sensing on the touch nodes included in the passive touch block Dis-TBLK for a second time. Here, the second time can be half of the first time, and thus, the power consumed by the sensing circuit of ROIC2 can be reduced.

[0084] In addition, the sensing circuit for each of ROIC0, ROIC1, ROIC3, ROIC4, and ROIC5 can correspond only to the passive touch block Dis-TBLK, and thus can perform semi-sensing on the touch nodes included in the passive touch block Dis-TBLK at a second time, thereby reducing power consumption through low-power driving.

[0085] Based on the channel multiplexer signal, a plurality of sensing circuits included in the ROIC can be connected to the touch nodes included in the active touch block En-TBLK or can be connected to the touch nodes included in the passive touch block Dis-TBLK.

[0086] Figure 8A FIG. is a diagram showing a semi-sensing operation of an odd sensing circuit that is powered on only during odd pulse periods of a touch driving signal. Figure 8B FIG. is a diagram showing odd touch nodes of a passive touch block that are connected to an odd sensing circuit and are semi-sensed.

[0087] Refer to Figure 8A and Figure 8B , a plurality of sensing circuits corresponding to the passive touch block Dis-TBLK can include odd sensing circuits SSU_ODD that are connected to odd touch nodes TN included in the passive touch block Dis-TBLK and are powered on only during odd pulse periods OT of the touch driving signal PWM_TX. The odd sensing circuits SSU_ODD can be powered off during even pulse periods ET of the touch driving signal PWM_TX, and can contribute to reducing power consumption.

[0088] In response to a power-on control signal SSU_PW that is powered on only during odd pulse periods OT of the touch driving signal PWM_TX and is powered off during even pulse periods ET of the touch driving signal PWM_TX, a preamplifier PAMP and an integration circuit ITG included in each of the odd sensing circuits SSU_ODD can be powered on only during odd pulse periods OT of the touch driving signal PWM_TX. Therefore, the odd sensing circuits SSU_ODD can accumulate touch sensing signals only during odd pulse periods OT of the touch driving signal PWM_TX, and can stop the accumulation operation during even pulse periods ET of the touch driving signal PWM_TX. The odd sensing circuits SSU_ODD can stop the accumulation operation during even pulse periods ET of the touch driving signal PWM_TX, and can hold the accumulated touch sensing signals until the accumulation operation stops.

[0089] The odd sensing circuit SSU_ODD can skip the pulse periods of the touch driving signal PWM_TX one by one and can perform half-sensing. Compared with the full-sensing method that senses all the entire pulse periods of the touch driving signal PWM_TX, such a half-sensing method can reduce the final level 50 of the touch sensing cumulative signal by half.

[0090] Figure 9A FIG. is a diagram showing a half-sensing operation of an even sensing circuit that is energized only during even pulse periods of a touch driving signal. Figure 9B FIG. is a diagram showing even touch nodes of a passive touch block that is connected to the even sensing circuit and is half-sensed.

[0091] Refer to Figure 9A and Figure 9B FIGS., a plurality of sensing circuits corresponding to the passive touch block Dis-TBLK may include an even sensing circuit SSU_EVEN that is connected to even touch nodes TN included in the passive touch block Dis-TBLK and is energized only during even pulse periods ET of the touch driving signal PWM_TX. The even sensing circuit SSU_EVEN may be de-energized during odd pulse periods OT of the touch driving signal PWM_TX and may help reduce power consumption.

[0092] In response to a power-on control signal SSU_PW that is energized only during even pulse periods ET of the touch driving signal PWM_TX and de-energized during odd pulse periods OT of the touch driving signal PWM_TX, a preamplifier PAMP and an integrating circuit ITG included in each of the even sensing circuits SSU_EVEN may be energized only during even pulse periods ET of the touch driving signal PWM_TX. Therefore, the even sensing circuit SSU_EVEN may accumulate a touch sensing signal only during even pulse periods ET of the touch driving signal PWM_TX and may stop the accumulation operation during odd pulse periods OT of the touch driving signal PWM_TX. The even sensing circuit SSU_EVEN may stop the accumulation operation during odd pulse periods OT of the touch driving signal PWM_TX and may hold the accumulated touch sensing signal until the accumulation operation stops.

[0093] The even sensing circuit SSU_EVEN can skip the pulse periods of the touch driving signal PWM_TX one by one and can perform half-sensing. Compared with the full-sensing method that senses all the entire pulse periods of the touch driving signal PWM_TX, such a half-sensing method can reduce the final level 50 of the touch sensing cumulative signal by half.

[0094] The odd sensing circuit SSU_ODD and the even sensing circuit SSU_EVEN can skip the pulse periods of the touch driving signal PWM_TX one by one, and can perform half-sensing, and in this case, half-sensing can be alternately performed in a period of one pulse period. Therefore, low-power driving can be performed without reducing the touch resolution.

[0095] Figure 10 FIG. is a diagram showing an overall circuit of the present disclosure for doubling the half-sensing output.

[0096] Referring to Figure 10 , the touch sensing display device according to the present disclosure can double the half-sensing output by using a shift circuit connected to the output terminal of the ADC.

[0097] The shift circuit can double the half-sensing output 50, and can store the amplified half-sensing output in the line buffer, and thus can compensate for the reduced sensing output value due to half-sensing by using the full-sensing level 100. Therefore, power consumption can be effectively reduced without causing an error between the touch sensing data obtained in the active touch block En-TBLK and the touch sensing data obtained in the passive touch block Dis-TBLK.

[0098] Figure 11A FIG. is a diagram showing the full-sensing operation of the sensing circuit powered on during the entire pulse period of the touch driving signal. Figure 11B FIG. is a diagram showing all touch nodes of the active touch block connected to the sensing circuit and fully sensed.

[0099] Referring to Figure 11A and Figure 11B , a plurality of sensing circuits corresponding to the active touch block En-TBLK can be connected to all touch nodes TN included in the active touch block En-TBLK. The odd sensing circuit SSU_ODD among the plurality of sensing circuits can be connected to the odd touch nodes TN included in the active touch block En-TBLK, and the even sensing circuit SSU_EVEN among the plurality of sensing circuits can be connected to the even touch nodes TN included in the active touch block En-TBLK.

[0100] The odd sensing circuit SSU_ODD and the even sensing circuit SSU_EVEN can remain powered on during the entire pulse period of the touch driving signal PWM_TX.

[0101] The preamplifier PAMP and the integration circuit ITG included in each of the odd sensing circuit SSU_ODD and the even sensing circuit SSU_EVEN can be powered on during the entire pulse period of the touch driving signal PWM_TX. Therefore, the odd sensing circuit SSU_ODD and the even sensing circuit SSU_EVEN can accumulate touch sensing signals during the entire pulse period of the touch driving signal PWM_TX. Such a method can be a method of performing full sensing on all of the entire pulse periods of the touch driving signal PWM_TX.

[0102] Figure 12 is a diagram showing a detailed configuration of a sensing circuit. Figure 13 is a diagram showing an example in which the first switch and the second switch of a sensing circuit are powered on only during the odd pulse period of the touch driving signal by the first switch control signal. Figure 14 is a diagram showing an example in which the first switch and the second switch of a sensing circuit are powered on only during the even pulse period of the touch driving signal by the second switch control signal. Figure 15 is a diagram showing an example in which the first switch and the second switch of a sensing circuit are powered on during the entire pulse period of the touch driving signal by the third switch control signal.

[0103] Referring to Figure 12 , the sensing circuit SSU according to the present disclosure may include a preamplifier circuit PAMP, an integration circuit ITG, a driving signal generator CTX, and a control signal generator CTR.

[0104] The preamplifier circuit PAMP may include a first amplifier AMP1 and a first switch SW1 that switches the driving power VIN input to the first amplifier AMP1. A first feedback capacitor CFB1 and a first reset switch RST1 may be connected in parallel between the input terminal and the output terminal of the first amplifier AMP1.

[0105] The integration circuit ITG may include a second amplifier AMP2 and a second switch SW2 that switches the driving power VIN input to the second amplifier AMP2. A second feedback capacitor CFB2 and a second reset switch RST2 may be connected in parallel between the input terminal and the output terminal of the second amplifier AMP2.

[0106] The control signal generator CTR may generate a touch driving signal PWM_TX having a plurality of pulse periods to be supplied to the touch block TBLK of the display panel.

[0107] The control signal generator CTR can generate a first switch control signal CON1 for semi-sensing odd touch nodes, a second switch control signal CON2 for semi-sensing even touch nodes, or a third switch control signal CON3 for fully sensing all touch nodes based on the touch driving signal PWM_TX and the register information RG about the touch input position obtained through pre-sensing.

[0108] The first switch SW1 of the preamplifier PAMP and the second switch SW2 of the integration circuit ITG can be turned on or off simultaneously by one of the first switch control signal CON1 to the third switch control signal CON3.

[0109] Refer to Figure 13 , the first switch control signal CONT1 can have a high level (or on level) during the odd pulse period OT of the touch driving signal PWM_TX and can have a low level (or off level) during the even pulse period ET of the touch driving signal PWM_TX.

[0110] The first switch SW1 and the second switch SW2 can be turned on simultaneously during the odd pulse period OT of the touch driving signal PWM_TX by the first switch control signal CON1 and can be turned off simultaneously during the even pulse period ET of the touch driving signal PWM_TX. Therefore, the first amplifier AMP1 and the second amplifier AMP2 can be turned on simultaneously during the odd pulse period OT of the touch driving signal PWM_TX and can be turned off simultaneously during the even pulse period ET of the touch driving signal PWM_TX.

[0111] Therefore, the preamplifier PAMP and the integration circuit ITG can semi-sense the odd touch nodes of the passive touch block during the odd pulse period OT of the touch driving signal PWM_TX to output a semi-level touch sensing cumulative signal.

[0112] Refer to Figure 14 , the second switch control signal CONT2 can have a high level (or on level) during the even pulse period ET of the touch driving signal PWM_TX and can have a low level (or off level) during the odd pulse period OT of the touch driving signal PWM_TX.

[0113] The first switch SW1 and the second switch SW2 can be turned on simultaneously during the even pulse period ET of the touch driving signal PWM_TX by the second switch control signal CON2 and can be turned off simultaneously during the odd pulse period OT of the touch driving signal PWM_TX. Therefore, the first amplifier AMP1 and the second amplifier AMP2 can be turned on simultaneously during the even pulse period ET of the touch driving signal PWM_TX and can be turned off simultaneously during the odd pulse period OT of the touch driving signal PWM_TX.

[0114] Therefore, the preamplifier PAMP and the integrating circuit ITG can perform semi-sensing on the even touch nodes of the passive touch block during the even pulse period ET of the touch driving signal PWM_TX to output a touch sensing cumulative signal at a half level.

[0115] Refer to Figure 15 , the third switch control signal CON3 can have a high level (or an on level) during the entire pulse period of the touch driving signal PWM_TX.

[0116] The first switch SW1 and the second switch SW2 can be turned on simultaneously during the entire pulse period of the touch driving signal PWM_TX through the third switch control signal CON3. Therefore, the first amplifier AMP1 and the second amplifier AMP2 can be turned on simultaneously during the entire pulse period of the touch driving signal PWM_TX.

[0117] Therefore, the preamplifier PAMP and the integrating circuit ITG can perform full-sensing on all the touch nodes of the active touch block during the entire pulse period of the touch driving signal PWM_TX to output a touch sensing cumulative signal at a full level.

[0118] Figure 16 is a diagram showing the sensing sequence according to the present disclosure.

[0119] Refer to Figure 16 , the channel multiplexer value (i.e., the touch input position) where a touch input occurs can be obtained by the MCU through a pre-sensing process based on full node sensing, and then, the touch input position can be transmitted to the corresponding ROIC (S10 and S20). The corresponding ROIC can record the touch input position in an internal register. For example, "0000110000" can be recorded in the Figure 7 internal register of ROIC2 in. In this case, "0000110000" can indicate that the channel multiplexers corresponding to the touch input position are CMUX4 and CMUX5.

[0120] The ROIC can start the touch sensing operation (S30 and S40) on the touch block corresponding to the first channel multiplexer during the low period L of the touch synchronization signal TSYNC.

[0121] The ROIC can check whether the current channel multiplexer corresponds to an active touch block including the touch input position (S50).

[0122] When the current channel multiplexer corresponds to an active touch block, the ROIC can perform full-sensing on the touch nodes included in the active touch block (S60).

[0123] When the current channel multiplexer corresponds to a passive touch block rather than an active touch block, the ROIC can perform semi-sensing (S70) on touch nodes included in the passive touch block.

[0124] The ROIC can repeat the sensing process described above while shifting the channel multiplexer CMUX until the last channel multiplexer (S80).

[0125] When the sensing process for the last channel multiplexer is completed, the ROIC can end the sensing sequence (S90 and S100).

[0126] The present disclosure can achieve the following effects.

[0127] Based on the channel multiplexer information corresponding to the touch input position input from the MCU, the present disclosure can perform full sensing on all touch nodes on the active touch block where a touch event is estimated to occur, can divide the touch nodes into odd touch nodes and even touch nodes in a checkerboard pattern on the passive touch block where a touch event is not estimated to occur, and can alternately turn on or off the sensing circuit according to the pulse period of the touch drive signal to perform semi-sensing, thereby reducing the power consumption of the sensing circuit.

[0128] The effects according to the present disclosure are not limited to the above examples, and various other effects can be included in the specification.

[0129] Although the present disclosure has been specifically shown and described with reference to exemplary embodiments thereof, those of ordinary skill in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A touch sensing display device, comprising: A display panel, the display panel including a plurality of touch blocks, the plurality of touch blocks being divided into at least one active touch block and at least one passive touch block relative to a touch input position, and each touch block being provided with a plurality of touch nodes; And A plurality of sensing circuits configured to perform full sensing on the touch nodes of the active touch blocks at a first time based on a touch driving signal and perform half sensing on the touch nodes of the passive touch blocks at a second time, Wherein, the first time corresponds to the entire pulse period of the touch driving signal, and The second time corresponds to an odd pulse period or an even pulse period of the touch driving signal.

2. The touch sensing display device according to claim 1, wherein, The second time is half of the first time, The active touch block includes the touch input position, and The passive touch block does not include the touch input position.

3. The touch sensing display device according to claim 1, wherein, The touch input position is pre-obtained by performing pre-sensing on all of the plurality of touch blocks.

4. The touch sensing display device according to claim 1, wherein, The plurality of sensing circuits are connected to the touch nodes of the active touch blocks or the touch nodes of the passive touch blocks based on a channel multiplexer signal.

5. The touch sensing display device according to claim 4, wherein, The plurality of sensing circuits include: An odd sensing circuit connected to the odd touch nodes of the passive touch blocks and powered on only during the odd pulse period of the touch driving signal; and An even sensing circuit connected to the even touch nodes of the passive touch blocks and powered on only during the even pulse period of the touch driving signal, and Wherein, the odd touch nodes and the even touch nodes of the passive touch block are alternately arranged to form a checkerboard pattern.

6. The touch sensing display device according to claim 5, wherein, The odd sensing circuit is powered off during the even pulse period of the touch driving signal, and The even sensing circuit is powered off during the odd pulse period of the touch driving signal.

7. The touch sensing display device according to claim 1, wherein, Each of the plurality of sensing circuits includes: A preamplifier circuit including a first amplifier and a first switch configured to switch the driving power input to the first amplifier; An integrating circuit including a second amplifier and a second switch configured to switch the driving power input to the second amplifier; A driving signal generator configured to generate the touch driving signal to be supplied to the plurality of touch nodes; and A control signal generator configured to output a switch control signal for simultaneously powering on or off the first switch and the second switch based on the touch input position and the touch driving signal.

8. The touch sensing display device according to claim 7, wherein, The first switch and the second switch are powered on during the entire pulse period of the touch driving signal, and The preamplifier and the integrating circuit perform full sensing on the touch nodes of the active touch blocks at the first time to output a touch sensing cumulative signal of full level.

9. The touch sensing display device according to claim 7, wherein, The first switch and the second switch are powered on only during the odd pulse period of the touch driving signal, and The preamplifier and the integrating circuit perform half-sensing on the odd touch nodes of the passive touch block at the second time to output a touch sensing cumulative signal at half level.

10. The touch sensing display device according to claim 7, wherein, The first switch and the second switch are only powered on during the even pulse periods of the touch driving signal, and the preamplifier and the integrating circuit perform half-sensing on the even touch nodes of the passive touch block at the second time to output a touch sensing cumulative signal at half level.

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