Touch sensor driving circuit and display device including the same

Abstract

A touch sensor driving circuit and a display device including the same are disclosed according to an embodiment. The touch sensor driving circuit includes: a driving circuit configured to apply a driving signal to a first touch electrode disposed in a display area via a plurality of TX lines; and a sensing circuit configured to sense voltages of a second touch electrode disposed in a first area and a second area of ​​the display area via a first RX line and a second RX line, respectively, the voltages being generated by the driving signal, wherein the sensing circuit is configured to amplify or integrate the voltage difference between a voltage sensed via an nth RX line (where n is a natural number) located closest to the outermost TX line of the plurality of TX lines and a second reference voltage, and to amplify or integrate the voltage difference between a voltage sensed via a (n+1)th RX line adjacent to the nth RX line and a first reference voltage different from the second reference voltage.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2024-0197855, filed on December 27, 2027, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to a touch sensor driving circuit and a display device including the same. Background Technology

[0004] The driving circuitry of a display device reproduces an input image on a pixel array by writing pixel data of the input image to the pixels of the display panel. The display device includes display panel driving circuitry, such as data driving circuitry that provides pixel data signals to data lines and gate driving circuitry that provides gate signals (or scan signals) to gate lines (or scan lines). Flat panel displays include control circuitry that controls the data driving circuitry and the gate driving circuitry, such as a timing controller.

[0005] A touchscreen can be provided on the screen of the display device. In this case, the display panel driving circuit may also include a touch sensor driving circuit that drives the touch sensor of the touchscreen. Summary of the Invention

[0006] The touch sensor driver circuit is connected to the touch line. The touch line includes a TX line that applies a drive signal and an RX line that transmits the touch sensor's sensing signal. In this case, edge capacitance occurs on the RX line closest to the TX line.

[0007] Such edge capacitors can cause touch errors, thus reducing touch performance.

[0008] This disclosure aims to address all the aforementioned necessities and issues.

[0009] The present invention provides a touch sensor driving circuit and a display device including the same.

[0010] It should be noted that the purpose of this disclosure is not limited to the above-described purposes, and other purposes of this disclosure will be apparent to those skilled in the art from the following description.

[0011] A touch sensor driving circuit according to an embodiment of the present disclosure may include: a driving circuit configured to apply a driving signal to a first touch electrode disposed in a display area via a plurality of TX lines; and a sensing circuit configured to sense voltages of a second touch electrode disposed in a first region and a second region of the display area via a first RX line and a second RX line, respectively, the voltages being generated by the driving signal, wherein the sensing circuit is configured to amplify or integrate the voltage difference between a voltage sensed by an nth RX line (where n is a natural number) positioned closest to the plurality of TX lines and located at the relatively outermost TX line and a second reference voltage, and to amplify or integrate the voltage difference between a voltage sensed by an (n+1)th RX line adjacent to the nth RX line and a first reference voltage different from the second reference voltage.

[0012] A touch sensor driving circuit according to an embodiment of the present disclosure may include: a driving circuit configured to apply a driving signal to a first touch electrode disposed in a display area via a plurality of TX lines; and a sensing circuit configured to sense voltages of a second touch electrode disposed in a first region and a second region of the display area via a first RX line and a second RX line, respectively, the voltages being generated by the driving signal, wherein the sensing circuit is configured to sense a voltage difference between two RX lines located closest to the plurality of TX lines and situated on the relatively outermost TX lines.

[0013] A display device according to embodiments of the present disclosure may include a display panel in which a plurality of pixels are arranged; a touch panel disposed on the display panel and including a plurality of first touch electrodes and a plurality of second touch electrodes, a plurality of TX lines and a plurality of RX lines, the plurality of first touch electrodes and the plurality of second touch electrodes being arranged in a display area divided into a first region and a second region, the plurality of TX lines being connected to the first touch electrodes and the plurality of RX lines being connected to the second touch electrodes; and a touch sensor driver connected to the first touch electrodes and the second touch electrodes, wherein the touch sensor driver includes: a driving circuit configured to apply a driving signal to the first touch electrodes via the plurality of TX lines. A first touch electrode; and a sensing circuit configured to sense the voltage of a second touch electrode disposed in a first region and the voltage of a second touch electrode disposed in a second region via a first RX line and a second RX line, respectively, the voltage being generated by a drive signal, wherein the sensing circuit is configured to amplify or integrate the voltage difference between a voltage sensed by an nth RX line located on the relatively outermost TX line and a second reference voltage, and to amplify or integrate the voltage difference between a voltage sensed by a (n+1)th RX line adjacent to the nth RX line and a first reference voltage different from the second reference voltage.

[0014] A display device according to embodiments of the present disclosure may include: a display panel having a plurality of pixels arranged therein; a touch panel located on the display panel and including a plurality of first touch electrodes and a plurality of second touch electrodes, as well as a plurality of TX lines and a plurality of RX lines, the plurality of first touch electrodes and the plurality of second touch electrodes being arranged in a display area divided into a first region and a second region, the plurality of TX lines being connected to the first touch electrodes and the plurality of RX lines being connected to the second touch electrodes; and a touch sensor driver connected to the first touch electrodes and the second touch electrodes, wherein the touch sensor driver includes: a driving circuit configured to apply a driving signal to the first touch electrodes via the plurality of TX lines; and a sensing circuit configured to sense the voltage of the second touch electrodes arranged in the first region and the voltage of the second touch electrodes arranged in the second region via the first RX lines and the second RX lines, respectively, the voltage being generated by the driving signal, wherein the sensing circuit is configured to sense the voltage difference between two RX lines located closest to the plurality of TX lines and situated on the relatively outermost TX lines.

[0015] This disclosure can prevent touch errors by performing differential sensing between the RX line closest to the TX line and another RX line, and by setting different reference voltages to be applied to the integrator connected to the RX line closest to the TX line and the integrator connected to the other RX line, thereby compensating for differences in edge capacitance.

[0016] This disclosure improves touch performance by preventing touch errors.

[0017] Because touch errors are prevented, this disclosure also enables low-power driving.

[0018] The effects of this specification are not limited to those described above, and other effects not mentioned will be readily understood by those skilled in the art from the following description and the appended claims. Attached Figure Description

[0019] The above and other objects, features, and advantages of this disclosure will become more apparent to those skilled in the art from the detailed description of exemplary embodiments thereof with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the present disclosure;

[0021] Figure 2 and Figure 3 It is used to describe Figure 1 A diagram of the touch sensor driver is shown.

[0022] Figures 4 to 6 It is a diagram used to describe the arrangement of the RX lines;

[0023] Figure 7 This is a diagram illustrating the configuration of a sensing circuit according to a first embodiment of the present disclosure;

[0024] Figure 8 It is shown Figure 7 A diagram showing the modified configuration of the sensing circuit;

[0025] Figure 9A and Figure 9B This is a diagram illustrating the configuration of a sensing circuit according to a second embodiment of the present disclosure;

[0026] Figure 10A and Figure 10B It is used to describe Figure 9A The diagram shows the operating principle of the sensing circuit.

[0027] Figure 11 This is a diagram illustrating the configuration of a sensing circuit according to a third embodiment of the present disclosure;

[0028] Figures 12 to 14 This is a diagram illustrating the sensing principle according to the fourth embodiment of this disclosure; and

[0029] Figure 15 This is a diagram illustrating the configuration of a sensing circuit according to a fourth embodiment of the present disclosure. Detailed Implementation

[0030] The advantages and features of this specification, as well as methods of implementing them, will become apparent from the preferred embodiments described in detail with reference to the accompanying drawings. However, this specification is not limited to the embodiments described below, and may be implemented in various forms. These embodiments are provided only to fully disclose this disclosure and to fully convey its scope to those skilled in the art, and this specification is defined by the disclosed claims.

[0031] Since the shapes, dimensions, scales, angles, quantities, etc., disclosed in the drawings used to describe embodiments of this disclosure are merely exemplary, this disclosure is not limited to the items shown. Throughout the specification, the same reference numerals denote the same parts. Furthermore, in describing this disclosure, detailed descriptions of relevant known technologies will be omitted where it is determined that such detailed descriptions might unnecessarily obscure the essence of this disclosure.

[0032] When using terms such as "comprising," "having," or "consisting of" in this specification, additional parts may be added unless "only" is used. Unless otherwise expressly stated, the singular form of a component includes the plural form.

[0033] When explaining components, it should be understood that the tolerance range is included, even if there is no separate explicit description.

[0034] When describing positional relationships, such as when the positional relationship between two parts is described as "on top of", "in the upper part", "in the lower part", "next to", etc., one or more other parts may be located between the two parts unless "adjacent" or "direct" is used.

[0035] Although terms like "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, within the technical spirit of this disclosure, the "first component" mentioned below can also be the "second component."

[0036] Throughout this disclosure, the same reference numerals may refer to substantially the same elements.

[0037] The following implementations may be combined or integrated with each other in part or in whole, and may be connected and operated in various technical ways. The implementations may be performed independently or in connection with each other.

[0038] Various embodiments of this disclosure will be described in detail below with reference to the accompanying drawings.

[0039] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the present disclosure.

[0040] refer to Figure 1 The display device according to an embodiment of the present disclosure includes a display panel 100, a display panel driving circuit for writing video data to pixels 101 on the display panel 100, a touch panel 200, a touch sensor driver 210 for driving a touch sensor on the touch panel 200, and a power supply 140 for generating the power required to drive the pixels 101, the touch sensor, the display panel driving circuit, and the touch sensor driver 210.

[0041] The substrate of the display panel 100 may be, but is not limited to, a plastic substrate, a thin glass substrate, or a metal substrate. The display panel 100 may be, but is not limited to, a rectangular panel having a length in the X-axis direction (or a first direction), a width in the Y-axis direction (or a second direction), and a thickness in the Z-axis direction (or a third direction). For example, at least a portion of the display panel 100 may have a curved outer periphery.

[0042] Display panel 100 can be implemented as a non-transmissive display panel or a transmissive display panel. Transmissive display panels can be applied to transparent display devices, where images are displayed on the screen and actual objects outside the display panel can be seen. Display panel 100 can be made into a flexible display panel. Display panel 100 can be made into a stretchable panel.

[0043] The display area AA of the display panel 100 includes a pixel array for displaying an input image. The pixel array includes multiple data lines 102, multiple gate lines 103 intersecting the data lines 102, and pixels arranged in a matrix. The display panel 100 may also include power lines commonly connected to the pixels. These power lines may be commonly connected to pixel circuitry to supply the voltage required to drive the pixels 101. The power lines may be implemented as long strips of wire along a first or second direction, or as a mesh of wires electrically connecting the wires in the first and second directions.

[0044] Pixel 101 may include a liquid crystal cell having liquid crystal molecules or a light-emitting element. Each of pixel 101 may be divided into red subpixels, green subpixels, and blue subpixels for color rendering. Each pixel may also include a white subpixel. Each subpixel includes pixel circuitry for driving the light-emitting element. The light-emitting element may include an OLED or an inorganic light-emitting diode (LED). Each pixel circuitry is connected to data lines, gate lines, and power lines. In the following description, a pixel may be interpreted as a subpixel.

[0045] The display area AA comprises multiple pixel rows L1 to Ln. Each of the pixel rows L1 to Ln comprises one row of pixels in a pixel array arranged along the row direction (X-axis direction) of the display panel 100. Pixels arranged in a pixel row share gate line 103. Subpixels arranged along the data line direction in the column direction Y share the same data line 102. A horizontal period is the time obtained by dividing one frame period by the total number of pixel rows L1 to Ln.

[0046] Power supply 140 generates a constant voltage (or direct current (DC) voltage) required to drive the pixel array and display panel driving circuitry of display panel 100 using a DC-DC converter. The DC-DC converter may include a charge pump, a voltage regulator, a buck converter, a boost converter, etc. Power supply 140 can adjust the level of the DC input voltage applied from host system 300 to output a constant voltage required to drive the display panel driving circuitry and pixels.

[0047] The display panel driving circuit, under the control of the timing controller 130, writes the pixel data of the input image into the pixels 101 of the display panel 100. The display panel driving circuit includes a data driver 110 and a gate driver 120.

[0048] The touch sensor in the touch panel 200 can be mounted on the display panel 100 as an on-cell type or add-on type, or it can be implemented as an in-cell type touch sensor embedded in the display panel 100. The touch sensor can be a capacitive touch sensor, such as a self-capacitance type touch sensor or a mutual-capacitance type touch sensor, but is not limited to these.

[0049] The data driver 110 and the touch sensor driver can be integrated into a single driver IC or into a separate driver IC. In mobile or wearable terminals, components such as the timing controller 130, power supply 140, data driver 110, and touch sensor driver circuit 210 can be integrated into a single driver IC.

[0050] The output terminals of data driver 110 are electrically connected to data line 102 of display panel 100. Data driver 110 receives video data of the input image provided as a digital signal from timing controller 130 and outputs a data voltage. Data driver 110 uses a digital-to-analog converter (hereinafter referred to as "DAC") to convert the video data of the input image into a gamma-compensated voltage and outputs the data voltage. A gamma reference voltage can be output from power supply 140. The gamma reference voltage is subdivided into gamma-compensated voltages for each grayscale by a voltage divider circuit in data driver 110 and provided to the DAC. The DAC generates a data voltage as a gamma-compensated voltage corresponding to the grayscale value of the video data. The data voltage from the DAC is output to data line 102 through an output buffer in each data output channel of data driver 110.

[0051] The display panel driving circuit may also include multiple demultiplexers (DEMUX) disposed between the output terminal of the data driver 110 and the data line 102. If the demultiplexers are connected between the output terminal of the data driver 110 and the data line 102, the number of channels of the data driver 110 can be reduced. The demultiplexers can be omitted.

[0052] The gate driver 120 may be formed on the display panel 100. The gate driver 120 may be disposed in a non-display area NA outside the display area AA in the display panel 100, or at least a portion thereof may be disposed within the display area AA.

[0053] The gate driver 120 can provide a gate signal to the gate line 103 using a single-feed method. In the single-feed method, the gate signal is applied to one end of the gate line 103. In the bidirectional-feed method, the gate signal is applied to both ends of the gate line 103 simultaneously.

[0054] The gate driver 120 sequentially outputs the gate signal to the gate line 103 by shifting the pulses of the gate signal using a shift register and / or an edge trigger.

[0055] Touch sensor driver 210 is connected to a touch line. Multiple touch sensors (i.e., a first touch electrode TX and a second touch electrode RX) are connected to the touch line. The touch line can be divided into TX lines TXL1 to TXLm and RX lines RXL1 to RXLn. A drive signal (hereinafter referred to as the "TX signal") is applied to the TX lines TXL1 to TXLm to drive the first touch electrode. The output signal of the second touch electrode is transmitted from the RX lines RXL1 to RXLn, but is not limited thereto. Touch sensor driver 210 can convert the voltage of the TX signal using a level shifter and provide it to the TX lines.

[0056] The touch sensor driver 210 applies TX signals to the first touch electrode via TX lines TXL1 to TXLm, amplifies the voltage received from the second touch electrode via RX lines RXL1 to RXLn, converts it into digital data, and outputs touch raw data. The touch sensor driver 210 compares the input touch raw data with a preset reference value and outputs touch data indicating each touch input. Touch data exceeding the reference value can be output as a logic value indicating a touch input. The touch data can be transmitted to the host system 300.

[0057] The timing controller 130 receives digital video data of the input image and timing signals synchronized with the data from the host system 200. The timing signals may include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, and a data enable signal DE. Since the vertical and horizontal periods can be determined by counting the data enable signal DE, the vertical synchronization signal Vsync and the horizontal synchronization signal Hsync can be omitted. The horizontal synchronization signal Hsync and the data enable signal DE have a period of one horizontal period (1H).

[0058] The timing controller 130 can control the display panel drive circuit by generating signals for controlling the operation timing of the display panel drive circuit based on the timing signals Vsync, Hsync, and DE received from the host system 200.

[0059] The host system 300 can scale the image signal from the video source according to the resolution of the display panel 100, and can send it along with a timing signal to the timing controller 130. The host system 300 can process user commands received via touch input in response to touch data TDATA input from the touch sensor driver 210.

[0060] Figure 2 and Figure 3 It is used to describe Figure 1 The diagram shown illustrates the touch sensor driver, and Figures 4 to 6 It is a diagram used to describe the arrangement of the RX lines.

[0061] Reference Figure 2 The touch sensors of the touch panel (i.e., the first touch electrode TX and the second touch electrode RX) can be formed in different layers. For example, the first touch electrode TX can be arranged in a first layer located on the upper part of the display panel, and the second touch electrode RX can be arranged in a second layer located above the first layer. However, this disclosure is not necessarily limited to this.

[0062] The first touch electrode TX and the second touch electrode RX can be formed by patterning a conductive metal layer, and can be formed in a grid shape. For example, the first touch electrode TX and the second touch electrode RX can be made of a transparent material, such as indium tin oxide (ITO).

[0063] Based on the TX line TXL to which a TX signal or drive signal is applied, the RX lines can be classified into a first group of RX lines RXL_G1 and a second group of RX lines RXL_G2. The first group of RX lines RXL_G1 can be connected to the second touch electrode RX arranged in the first region A1, and the second group of RX lines RXL_G2 can be connected to the second touch electrode RX arranged in the second region A2.

[0064] The touch sensor driver 210 can apply a drive signal to the first touch electrode TX via the TX line TXL, and can sense the voltage of the second touch electrode via the first RX line and the second RX line.

[0065] The touch sensor driver 210 may include a driving circuit 211 and a sensing circuit 212. The driving circuit 211 can sequentially apply driving signals to the first touch electrode TX via the TX line TXL.

[0066] The sensing circuit 212 can sense the touch signal received from the second touch electrode RX via the RX line RXL. The sensing circuit 212 may include a first differential amplifier DAMP1, an amplifier AMP, an integrator INT, and a second differential amplifier DAMP2.

[0067] The first differential amplifier DAMP1 may include a first-1 differential amplifier DAMP11 connected to the nth RX line RXLn and a first-2 differential amplifier DAMP12 connected to the (n+1)th RX line RXLn+1. The first-1 differential amplifier DAMP11 amplifies and outputs the difference between the voltage of the nth RX line RXLn and a predetermined reference voltage. The first-2 differential amplifier DAMP12 amplifies and outputs the difference between the voltage of the (n+1)th RX line RXLn+1 and a predetermined reference voltage.

[0068] The amplifier AMP may include a first-in-1 amplifier AMP11 and a first-in-2 amplifier AMP12. The first-in-1 amplifier AMP11 amplifies and outputs the signal from the first-in-1 differential amplifier DAMP11. The first-in-2 amplifier AMP12 amplifies and outputs the signal from the first-in-2 differential amplifier DAMP12.

[0069] The integrator INT can include integrator INT11 (first-1) and integrator INT12 (first-2). Integrator INT11 (first-1) integrates and outputs the signal amplified by amplifier AMP11 (first-1). Integrator INT12 (first-2) integrates and outputs the signal amplified by amplifier AMP12 (first-2).

[0070] The second differential amplifier DAMP2 can amplify and output the difference between the signal output from the first-1 integrator INT11 and the signal output from the first-2 integrator INT12.

[0071] Differential sensing is performed when the second differential amplifier DAMP2 amplifies and outputs the difference between the voltage of the nth RX line RXLn and the voltage of the (n+1)th RX line RXLn+1.

[0072] The touch sensor driver 210 may also include a recognition circuit. The recognition circuit compares touch data received from the sensing circuit 212 with a preset threshold, detects touch data exceeding the threshold, and generates coordinates for each touch input. The recognition circuit can then send the generated coordinates of the touch input to the host system 300.

[0073] In this case, RX lines RXL1 to RXLn can be connected to sensing circuit 212, such as Figure 4 As shown. Therefore, the sensing circuit 212 can perform differential sensing between two adjacent RX lines.

[0074] Therefore, in the drive circuit 211, the TX signal can be applied in units of four TX lines TXL, such as... Figure 5 As shown. For example, the TX signal can be applied simultaneously to the first to fourth TX lines TXL1 to TXL4, and then to the fifth to eighth TX lines TXL5 to TXL8.

[0075] However, as Figure 2 As shown, the 27th RX line RXL27 is arranged adjacent to the first TX line TXL1, and the nth RX line RXLn is arranged adjacent to the mth TX line TXLm. Therefore, due to the adjacent first TX line TXL1 and mth TX line TXLm, the edge capacitance in the 27th RX line RXL27 and the nth RX line RXLn increases.

[0076] In other words, when the first to the nth RX lines RXL1 to RXLn are as follows Figure 4 When connected in the sequence shown, differential sensing is performed between the 27th RX line RXL27, which exhibits relatively large edge capacitance, and the 28th RX line RXL28, which exhibits relatively small edge capacitance.

[0077] like Figure 6 As shown, the differential sensing result between the 27th RX line RXL27 and the 28th RX line RXL28, which has edge capacitance, is different from the differential sensing result between the 1st RX line RXL1 and the 2nd RX line RXL2, thus reducing touch performance.

[0078] Therefore, differential sensing that takes into account this edge capacitance should be performed. For this purpose, in the first embodiment, the reference voltage applied to the integrator in the sensing circuit is adjusted.

[0079] Figure 7 This is a diagram illustrating the configuration of a sensing circuit according to a first embodiment of the present disclosure.

[0080] Reference Figure 7 According to the first embodiment of this disclosure, the sensing circuit 212 can differentially sense touch signals received from the second touch electrode RX via adjacent RX lines RXL. The sensing circuit 212 may include a first differential amplifier DAMP1, an amplifier AMP, an integrator INT, and a second differential amplifier DAMP2.

[0081] The first differential amplifier DAMP1 may include a first-to-first differential amplifier DAMP11 connected to the nth RX line RXLn and a first-to-second differential amplifier DAMP12 connected to the (n+1)th RX line RXLn+1.

[0082] The first-1 differential amplifier DAMP11 amplifies and outputs the difference between the voltage of the nth RX line RXLn and a predetermined reference voltage Vref. The first-1 differential amplifier DAMP11 may include a first operational amplifier OP1. The inverting input (-) of the first operational amplifier OP1 can be connected to the nth RX line RXLn, and its non-inverting input (+) can be connected to a power supply line to which the reference voltage Vref is applied.

[0083] Here, Cm represents the edge capacitance between the first touch electrode TX and the second touch electrode RX in the display area, and Cm' represents the edge capacitance between the TX line and the RX line.

[0084] The first-second differential amplifier DAMP12 amplifies and outputs the difference between the voltage of the (n+1)th RX line RXLn+1 and a predetermined reference voltage Vref. The first-second differential amplifier DAMP12 may include a second operational amplifier OP2. The inverting input (-) of the second operational amplifier OP2 can be connected to the (n+1)th RX line RXLn+1, and its non-inverting input (+) can be connected to a power supply line to which the reference voltage Vref is applied.

[0085] The amplifier AMP may include amplifier AMP11 (first-first amplifier) ​​and amplifier AMP12 (first-second amplifier).

[0086] Amplifier AMP11 (1-1) amplifies and outputs the signal from differential amplifier DAMP11 (1-1). Amplifier AMP11 (1-1) may include a third operational amplifier OP3, a first resistor R1, and a second resistor R2. The first resistor R1 may be connected to the input terminal of the third operational amplifier OP3, and the second resistor R2 may be connected between the input and output terminals of the third operational amplifier OP3.

[0087] Amplifier AMP12 (first-second amplifier) ​​amplifies and outputs the signal from differential amplifier DAMP12 (first-second differential amplifier). Amplifier AMP12 (first-second amplifier) ​​may include a fourth operational amplifier OP4, a third resistor R3, and a fourth resistor R4. The third resistor R3 can be connected to the input terminal of the fourth operational amplifier OP4, and the fourth resistor R4 can be connected between the input and output terminals of the fourth operational amplifier OP4.

[0088] The integrator INT can include the first integrator INT11 and the first integrator INT12.

[0089] The first-1 integrator INT11 can integrate and output the signal amplified by the first-1 amplifier AMP11 using a predetermined second reference voltage Vref2. The first-1 integrator INT11 may include a fifth operational amplifier OP5, a fifth resistor R5, and a first capacitor C1. The fifth resistor R5 can be connected to the inverting input terminal of the fifth operational amplifier OP5, and the first capacitor C1 can be connected between the inverting input terminal and the output terminal of the fifth operational amplifier OP5.

[0090] The first-second integrator INT12 can integrate and output the signal amplified by the first-second amplifier AMP12 using a predetermined first reference voltage Vref1. The first-second integrator INT12 may include a sixth operational amplifier OP6, a sixth resistor R6, and a second capacitor C2. The sixth resistor R6 can be connected to the inverting input terminal of the sixth operational amplifier OP6, and the second capacitor C2 can be connected between the inverting input terminal and the output terminal of the sixth operational amplifier OP6.

[0091] In this case, the second reference voltage Vref2 applied to the first integrator INT11 for integrating the signal received from the nth RX line RXLn where edge capacitance has occurred can be set to be greater than the first reference voltage Vref1 applied to the first integrator INT12 for integrating the signal received from the (n+1)th RX line RXL(n+1) where edge capacitance has not occurred.

[0092] In one implementation, the first reference voltage Vref1 may be the same as the reference voltage Vref.

[0093] Conversely, when there is no edge capacitance or a negligible edge capacitance in either the nth RX line RXLn or the (n+1)th RX line RXLn+1, the reference voltage applied to the 1-1 integrator INT11 and the 1-2 integrator INT12 can be set to the same voltage.

[0094] The second differential amplifier DAMP2 amplifies and outputs the difference between the signal output from the first-1 integrator INT11 and the signal output from the first-2 integrator INT12. The second differential amplifier DAMP2 may include a seventh operational amplifier OP7. The inverting input terminal (-) of the seventh operational amplifier OP7 can be connected to the output terminal of the first-1 integrator INT11, and its non-inverting input terminal (+) can be connected to the output terminal of the first-2 integrator INT12.

[0095] Differential sensing can be performed by amplifying and outputting the difference between the voltage of the nth RX line RXLn and the voltage of the (n+1)th RX line RXLn+1 in the second differential amplifier DAMP2.

[0096] Figure 8 It is shown Figure 7 The diagram shows a modified configuration of the sensing circuit.

[0097] refer to Figure 8 The modified sensing circuit 212 of this disclosure may include a first differential amplifier DAMP1, an amplifier AMP, an integrator INT, and a second differential amplifier DAMP2.

[0098] The first differential amplifier DAMP1 may include a first-1 differential amplifier DAMP11 connected to the (n+1)th RX line RXLn+1 and a first-2 differential amplifier DAMP12 connected to the nth RX line RXLn.

[0099] The first-1 differential amplifier DAMP11 amplifies and outputs the difference between the voltage of the (n+1)th RX line RXLn+1 and a predetermined reference voltage Vref. The first-1 differential amplifier DAMP11 may include a first operational amplifier OP1. The inverting input (-) of the first operational amplifier OP1 can be connected to the (n+1)th RX line RXLn+1, and its non-inverting input (+) can be connected to a power supply line to which the reference voltage Vref is applied.

[0100] The first-second differential amplifier DAMP12 amplifies and outputs the difference between the voltage of the nth RX line RXLn and a predetermined reference voltage Vref. The first-second differential amplifier DAMP12 may include a second operational amplifier OP2. The inverting input terminal (-) of the second operational amplifier OP2 can be connected to the nth RX line RXLn, and its non-inverting input terminal (+) can be connected to a power supply line to which the reference voltage Vref is applied.

[0101] The amplifier AMP may include amplifier AMP11 (first-first amplifier) ​​and amplifier AMP12 (first-second amplifier).

[0102] Amplifier AMP11 (1-1) amplifies and outputs the signal from differential amplifier DAMP11 (1-1). Amplifier AMP11 (1-1) may include a third operational amplifier OP3, a first resistor R1, and a second resistor R2. The first resistor R1 may be connected to the input terminal of the third operational amplifier OP3, and the second resistor R2 may be connected between the input and output terminals of the third operational amplifier OP3.

[0103] Amplifier AMP12 (first-second amplifier) ​​amplifies and outputs the signal from differential amplifier DAMP12 (first-second differential amplifier). Amplifier AMP12 (first-second amplifier) ​​may include a fourth operational amplifier OP4, a third resistor R3, and a fourth resistor R4. The third resistor R3 can be connected to the input terminal of the fourth operational amplifier OP4, and the fourth resistor R4 can be connected between the input and output terminals of the fourth operational amplifier OP4.

[0104] The integrator INT can include the first integrator INT11 and the first integrator INT12.

[0105] The first-1 integrator INT11 can integrate and output the signal amplified by the first-1 amplifier AMP11 using a predetermined second reference voltage Vref2. The first-1 integrator INT11 may include a fifth operational amplifier OP5, a fifth resistor R5, and a first capacitor C1. The fifth resistor R5 can be connected to the inverting input terminal of the fifth operational amplifier OP5, and the first capacitor C1 can be connected between the inverting input terminal and the output terminal of the fifth operational amplifier OP5.

[0106] The first-second integrator INT12 can integrate and output the signal amplified by the first-second amplifier AMP12 using a predetermined first reference voltage Vref1. The first-second integrator INT12 may include a sixth operational amplifier OP6, a sixth resistor R6, and a second capacitor C2. The sixth resistor R6 can be connected to the inverting input terminal of the sixth operational amplifier OP6, and the second capacitor C2 can be connected between the inverting input terminal and the output terminal of the sixth operational amplifier OP6.

[0107] In this case, the first reference voltage Vref1 applied to the first-second integrator INT12 for integrating the signal received from the nth RX line RXLn where edge capacitance has occurred can be set to be greater than the second reference voltage Vref2 applied to the first-first integrator INT11 for integrating the signal received from the (n+1)th RX line RXLn+1 where edge capacitance has not occurred.

[0108] This is because it is not used for Figure 7 The sensing circuit receives the signal from the nth RX line RXLn, which is input to the non-inverting input terminal of the seventh operational amplifier OP7, and the signal received from the (n+1)th RX line RXLn+1 is input to the inverting input terminal of the seventh operational amplifier OP7.

[0109] The second differential amplifier DAMP2 amplifies and outputs the difference between the signal output from the first-1 integrator INT11 and the signal output from the first-2 integrator INT12. The second differential amplifier DAMP2 may include a seventh operational amplifier OP7. The inverting input terminal (-) of the seventh operational amplifier OP7 can be connected to the output terminal of the first-1 integrator INT11, and its non-inverting input terminal (+) can be connected to the output terminal of the first-2 integrator INT12.

[0110] Differential sensing can be performed by amplifying and outputting the difference between the voltage of the nth RX line RXLn and the voltage of the (n+1)th RX line RXLn+1 in the second differential amplifier DAMP2.

[0111] Figure 9A and Figure 9B This is a diagram illustrating the configuration of a sensing circuit according to a second embodiment of the present disclosure.

[0112] refer to Figure 9A According to the second embodiment of this disclosure, the sensing circuit 212 can differentially sense touch signals received from the second touch electrode RX via adjacent RX lines RXL. The sensing circuit 212 may include a first differential amplifier DAMP1, an amplifier AMP, an integrator INT, and a second differential amplifier DAMP2.

[0113] The first differential amplifier DAMP1 may include a first-to-first differential amplifier DAMP11 connected to the nth RX line RXLn and a first-to-second differential amplifier DAMP12 connected to the (n+1)th RX line RXLn+1.

[0114] The first-1 differential amplifier DAMP11 amplifies and outputs the difference between the voltage of the nth RX line RXLn and a predetermined reference voltage Vref. The first-1 differential amplifier DAMP11 may include a first operational amplifier OP1. The inverting input (-) of the first operational amplifier OP1 can be connected to the nth RX line RXLn, and its non-inverting input (+) can be connected to a power supply line to which the reference voltage Vref is applied.

[0115] The first-second differential amplifier DAMP12 amplifies and outputs the difference between the voltage of the (n+1)th RX line RXLn+1 and a predetermined reference voltage Vref. The first-second differential amplifier DAMP12 may include a second operational amplifier OP2. The inverting input (-) of the second operational amplifier OP2 can be connected to the (n+1)th RX line RXLn+1, and its non-inverting input (+) can be connected to a power supply line to which the reference voltage Vref is applied.

[0116] The amplifier AMP may include amplifier AMP11 (first-first amplifier) ​​and amplifier AMP12 (first-second amplifier).

[0117] Amplifier AMP11 (1-1) amplifies and outputs the signal from differential amplifier DAMP11 (1-1). Amplifier AMP11 (1-1) may include a third operational amplifier OP3, a first resistor R1, and a second resistor R2. The first resistor R1 may be connected to the input terminal of the third operational amplifier OP3, and the second resistor R2 may be connected between the input and output terminals of the third operational amplifier OP3.

[0118] Amplifier AMP12 (first-second amplifier) ​​amplifies and outputs the signal from differential amplifier DAMP12 (first-second differential amplifier). Amplifier AMP12 (first-second amplifier) ​​may include a fourth operational amplifier OP4, a third resistor R3, and a fourth resistor R4. The third resistor R3 can be connected to the input terminal of the fourth operational amplifier OP4, and the fourth resistor R4 can be connected between the input and output terminals of the fourth operational amplifier OP4.

[0119] The integrator INT can include the first integrator INT11 and the first integrator INT12.

[0120] The first-1 integrator INT11 can integrate and output the signal amplified by the first-1 amplifier AMP11 using either the first reference voltage Vref1 or the second reference voltage Vref2. The first-1 integrator INT11 may include a fifth operational amplifier OP5, a fifth resistor R5, a first capacitor C1, and a switch SW. The fifth resistor R5 can be connected to the inverting input terminal of the fifth operational amplifier OP5, and the first capacitor C1 can be connected between the inverting input terminal and the output terminal of the fifth operational amplifier OP5.

[0121] like Figure 9B As shown, the switch SW can be driven by a control signal generated by the drive circuit, such that the first contact point 'a' is connected to the second contact point 'b' to apply a first reference voltage Vref1, or the first contact point 'a' is connected to the third contact point 'c' to apply a second reference voltage Vref2. Here, the switch SW can be implemented as a three-way switch, but this disclosure is not limited thereto.

[0122] In other words, the integrator connected to the RX line where the edge capacitance Cm' occurs can be configured to selectively apply a first reference voltage or a second reference voltage. This is because the distance between the TX line to which the drive signal is applied and the RX line closest to the TX line is designed to be equal to or greater than a threshold, such that the edge capacitance Cm' caused by the distance between the TX and RX lines occurs only to a negligible degree.

[0123] The first-second integrator INT12 can integrate and output the signal amplified by the first-second amplifier AMP12 using the first reference voltage Vref1. The first-second integrator INT12 may include a sixth operational amplifier OP6, a sixth resistor R6, and a second capacitor C2. The sixth resistor R6 can be connected to the inverting input terminal of the sixth operational amplifier OP6, and the second capacitor C2 can be connected between the inverting input terminal and the output terminal of the sixth operational amplifier OP6.

[0124] The second differential amplifier DAMP2 amplifies and outputs the difference between the signal output from the first-1 integrator INT11 and the signal output from the first-2 integrator INT12. The second differential amplifier DAMP2 may include a seventh operational amplifier OP7. The inverting input terminal (-) of the seventh operational amplifier OP7 can be connected to the output terminal of the first-1 integrator INT11, and its non-inverting input terminal (+) can be connected to the output terminal of the first-2 integrator INT12.

[0125] Differential sensing is performed by amplifying and outputting the difference between the voltage of the nth RX line RXLn and the voltage of the (n+1)th RX line RXLn+1 in the second differential amplifier DAMP2.

[0126] Figure 10A and Figure 10B It is used to describe Figure 9A The diagram shows the operating principle of the sensing circuit.

[0127] refer to Figure 10A When the edge capacitance on the nth RX line RXLn is less than the threshold or does not exist, the first reference voltage Vref1 is applied to the non-inverting input terminal (+) of the 1-1 integrator INT11.

[0128] refer to Figure 10B When the edge capacitance on the nth RX line RXLn exists and is equal to or greater than the threshold, the second reference voltage Vref2 is applied to the non-inverting input terminal (+) of the 1-1 integrator INT11.

[0129] In a third embodiment of this disclosure, instead of applying different reference voltages to an integrator in a sensing circuit, different reference voltages are intended to be applied to a differential amplifier.

[0130] Figure 11 This is a diagram illustrating the configuration of a sensing circuit according to a third embodiment of the present disclosure.

[0131] refer to Figure 11According to the third embodiment of this disclosure, the sensing circuit 212 can differentially sense touch signals received from the second touch electrode RX via adjacent RX lines RXL. The sensing circuit 212 may include a first differential amplifier DAMP1, an amplifier AMP, an integrator INT, and a second differential amplifier DAMP2.

[0132] The sensing circuit according to the third embodiment has a... Figure 7 The sensing circuit of the first embodiment shown has the same configuration and function, and the only difference is that the reference voltages applied to the first differential amplifier DAMP1 and the integrator INT are different. Therefore, only the first differential amplifier DAMP1 and the integrator INT will be described.

[0133] The first differential amplifier DAMP1 may include a first-to-first differential amplifier DAMP11 connected to the nth RX line RXLn and a first-to-second differential amplifier DAMP12 connected to the (n+1)th RX line RXLn+1.

[0134] The first-1 differential amplifier DAMP11 can amplify and output the difference between the voltage of the nth RX line RXLn and a predetermined second reference voltage Vref2. The first-1 differential amplifier DAMP11 may include a first operational amplifier OP1. The inverting input terminal (-) of the first operational amplifier OP1 can be connected to the nth RX line RXLn, and its non-inverting input terminal (+) can be connected to the power supply line to which the second reference voltage Vref2 is applied.

[0135] The first-second differential amplifier DAMP12 amplifies and outputs the difference between the voltage of the (n+1)th RX line RXLn+1 and a predetermined first reference voltage Vref1. The first-second differential amplifier DAMP12 may include a second operational amplifier OP2. The inverting input (-) of the second operational amplifier OP2 can be connected to the (n+1)th RX line RXLn+1, and its non-inverting input (+) can be connected to a power supply line to which the first reference voltage Vref1 is applied.

[0136] The amplifier AMP may include amplifier AMP11 (first-first amplifier) ​​and amplifier AMP12 (first-second amplifier).

[0137] Amplifier AMP11 (1-1) amplifies and outputs the signal from differential amplifier DAMP11 (1-1). Amplifier AMP11 (1-1) may include a third operational amplifier OP3, a first resistor R1, and a second resistor R2. The first resistor R1 may be connected to the input terminal of the third operational amplifier OP3, and the second resistor R2 may be connected between the input and output terminals of the third operational amplifier OP3.

[0138] Amplifier AMP12 (first-second amplifier) ​​amplifies and outputs the signal from differential amplifier DAMP12 (first-second differential amplifier). Amplifier AMP12 (first-second amplifier) ​​may include a fourth operational amplifier OP4, a third resistor R3, and a fourth resistor R4. The third resistor R3 can be connected to the input terminal of the fourth operational amplifier OP4, and the fourth resistor R4 can be connected between the input and output terminals of the fourth operational amplifier OP4.

[0139] The integrator INT can include the first integrator INT11 and the first integrator INT12.

[0140] The first-integrator INT11 can integrate and output the signal amplified by the first-integrator AMP11 using a predetermined reference voltage Vref. The first-integrator INT11 may include a fifth operational amplifier OP5, a fifth resistor R5, and a first capacitor C1. The fifth resistor R5 can be connected to the inverting input terminal of the fifth operational amplifier OP5, and the first capacitor C1 can be connected between the inverting input terminal and the output terminal of the fifth operational amplifier OP5.

[0141] The first-second integrator INT12 can integrate and output a signal amplified by a predetermined reference voltage Vref, which is then integrated by the first-second amplifier AMP12. The first-second integrator INT12 may include a sixth operational amplifier OP6, a sixth resistor R6, and a second capacitor C2. The sixth resistor R6 can be connected to the inverting input terminal of the sixth operational amplifier OP6, and the second capacitor C2 can be connected between the inverting input terminal and the output terminal of the sixth operational amplifier OP6.

[0142] The second differential amplifier DAMP2 amplifies and outputs the difference between the signal output from the first-1 integrator INT11 and the signal output from the first-2 integrator INT12. The second differential amplifier DAMP2 may include a seventh operational amplifier OP7. The inverting input terminal (-) of the seventh operational amplifier OP7 can be connected to the output terminal of the first-1 integrator INT11, and its non-inverting input terminal (+) can be connected to the output terminal of the first-2 integrator INT12.

[0143] Differential sensing can be performed by amplifying and outputting the difference between the voltage of the nth RX line RXLn and the voltage of the (n+1)th RX line RXLn+1 in the second differential amplifier DAMP2.

[0144] In the fourth embodiment of this disclosure, the arrangement of the RX line connected to the sensing circuit is changed instead of applying different reference voltages to an integrator or differential amplifier in the sensing circuit.

[0145] Figures 12 to 14 This is a diagram used to describe the sensing principle according to the fourth embodiment of this disclosure.

[0146] refer to Figure 12 In the fourth embodiment of this disclosure, among the RX lines RXL1 to RXLn, the RX lines exhibiting relatively large edge capacitance are arranged to be adjacent to each other in the sensing circuit 212.

[0147] For example, the 27th RX line RXL27 and the nth RX line RXLn are connected adjacently to the sensing circuit 212. The first RX lines RXL1 to the 27th RX line RXL27 are connected adjacently in sequence, and the nth RX line RXLn to the 28th RX line RXL28 are connected adjacently in reverse order.

[0148] Therefore, in the sensing circuit 212 according to the embodiment, differential sensing is performed between the twenty-seventh RX line RXL27 and the nth RX line RXLn, which exhibit relatively large edge capacitance.

[0149] To achieve this, a TX signal needs to be applied such that the drive signal applied to the TX line has the same effect on the first to twenty-seventh RX lines and the nth to twenty-eighth RX lines.

[0150] Furthermore, since the nth to twenty-eighth RX lines RXLn to RXL28 are connected adjacently in reverse order, and differential sensing is performed between the twenty-seventh RX line RXL27 and the nth RX line RXLn, it is necessary to simultaneously apply a TX signal from the outermost region of the TX line and the corresponding regions towards the center region of the TX line, along with the outermost regions of the first to twenty-seventh RX lines RXL1 to RXL27 and the nth to twenty-eighth RX lines RXLn to RXL28. Figure 13 As shown.

[0151] Therefore, in the implementation method, such as Figure 14 As shown, the TX signal is applied in units of four TX lines, and the TX signal is simultaneously applied to the first TX line TXL1, the second TX line TXL2, the (m-1)th TX line TXLm-1 and the mth TX line TXLm, and then simultaneously applied to the third TX line TXL3, the fourth TX line TXL4, the (m-3)th TX line TXLm-3 and the (m-2)th TX line TXLm-2.

[0152] Figure 15 This is a diagram illustrating the configuration of a sensing circuit according to a fourth embodiment of the present disclosure.

[0153] Reference Figure 15According to the fourth embodiment of this disclosure, the sensing circuit 212 can differentially sense touch signals received from the second touch electrode RX via adjacent RX lines RXL. The sensing circuit 212 may include a first differential amplifier DAMP1, an amplifier AMP, an integrator INT, and a second differential amplifier DAMP2.

[0154] The sensing circuit according to the fourth embodiment has the same configuration and function as the sensing circuit of the first embodiment. However, the only difference is the reference voltage applied to the integrator, and therefore, only this aspect will be described.

[0155] The integrator INT can include the first integrator INT11 and the first integrator INT12.

[0156] The first-integrator INT11 integrates and outputs the signal amplified by the first-integrator AMP11. The first-integrator INT11 may include a fifth operational amplifier OP5, a fifth resistor R5, and a first capacitor C1. The fifth resistor R5 is connected to the inverting input terminal (-) of the fifth operational amplifier OP5, and the power supply line with the applied reference voltage Vref is connected to the non-inverting input terminal (+) of the fifth operational amplifier OP5. The first capacitor C1 may be connected between the inverting input terminal (-) and the output terminal of the fifth operational amplifier OP5.

[0157] The first-to-second integrator INT12 integrates and outputs the signal amplified by the first-to-second amplifier AMP12. The first-to-second integrator INT12 may include a sixth operational amplifier OP6, a sixth resistor R6, and a second capacitor C2. The sixth resistor R6 can be connected to the inverting input terminal (-) of the sixth operational amplifier OP6, and a power supply line with a reference voltage Vref applied is connected to the non-inverting input terminal (+) of the sixth operational amplifier OP5. The second capacitor C2 can be connected between the inverting input terminal (-) and the output terminal of the sixth operational amplifier OP6.

[0158] In the fourth embodiment, differential sensing is performed between RX lines where edge capacitance Cm' occurs and between RX lines where edge capacitance Cm' is negligible. Therefore, it is not necessary to apply different reference voltages to the integrator.

[0159] Although embodiments of the present disclosure have been described in more detail with reference to the accompanying drawings, the present disclosure is not limited thereto and can be implemented in many different forms without departing from the technical concept of the present disclosure. Therefore, the embodiments disclosed in this disclosure are for illustrative purposes only and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Therefore, it should be understood that the above embodiments are illustrative in all respects and do not limit the present disclosure.

Claims

1. A touch sensor driving circuit, comprising: The driving circuit is configured to apply driving signals to a first touch electrode arranged in the display area via multiple TX lines; as well as The sensing circuit is configured to sense the voltage of a second touch electrode disposed in a first region and a second region within the display area via a first RX line and a second RX line, respectively, the voltage being generated by the drive signal. The sensing circuit is configured to amplify or integrate the voltage difference between a voltage sensed by an nth RX line located closest to the plurality of TX lines and a second reference voltage, and to amplify or integrate the voltage difference between a voltage sensed by an (n+1)th RX line adjacent to the nth RX line and a first reference voltage different from the second reference voltage, where n is a natural number.

2. The touch sensor driving circuit according to claim 1, wherein the sensing circuit comprises: The first-1 differential amplifier is configured to amplify and output the difference between the voltage of the second touch electrode sensed through the nth RX line and the first reference voltage; The first and second differential amplifiers are configured to amplify and output the difference between the voltage of the second touch electrode sensed through the (n+1)th RX line and the first reference voltage; The first-1 amplifier is configured to amplify and output the signal from the first-1 differential amplifier; The first and second amplifiers are configured to amplify and output the signal from the first and second differential amplifiers; The first-1 integrator is configured to integrate and output the difference between the signal amplified by the first-1 amplifier and the second reference voltage which is higher than the first reference voltage; The first and second integrators are configured to integrate and output the difference between the signal amplified by the first and second amplifiers and the first reference voltage. as well as The second differential amplifier is configured to amplify and output the difference between the signal output from the first-1 integrator and the signal output from the first-2 integrator.

3. The touch sensor driving circuit according to claim 2, wherein the first-1 integrator comprises an operational amplifier, a resistor, and a capacitor, and The operational amplifier includes an inverting input terminal connected to the resistor and a non-inverting input terminal connected to a power supply line to which the second reference voltage is applied. The resistor is connected between the nth RX line and the inverting input terminal of the operational amplifier, and The capacitor is connected to the inverting input terminal of the operational amplifier.

4. The touch sensor driving circuit according to claim 3, wherein the first-1 integrator further includes a first switch and a second switch. The first switch is connected between the non-inverting input terminal of the operational amplifier and the power supply line to which the first reference voltage is applied, and The second switch is connected between the non-inverting input terminal of the operational amplifier and the power supply line to which the second reference voltage is applied.

5. The touch sensor driving circuit of claim 4, wherein each of the first switch and the second switch includes a first contact point connected to the non-inverting input terminal of the operational amplifier, a second contact point connected to the power line to which the first reference voltage is applied, and a third contact point connected to the power line to which the second reference voltage is applied.

6. The touch sensor driving circuit of claim 5, wherein the driving circuit is configured to connect the first contact point to the second contact point when the amplitude of the edge capacitance generated in the RX line is less than a predetermined threshold, and to connect the first contact point to the third contact point when the amplitude of the edge capacitance generated in the RX line is equal to or greater than the threshold.

7. The touch sensor driving circuit according to claim 1, wherein the sensing circuit comprises: The first-1 differential amplifier is configured to amplify and output the difference between the voltage of the second touch electrode sensed through the (n+1)th RX line and the first reference voltage; The first and second differential amplifiers are configured to amplify and output the difference between the voltage of the second touch electrode sensed by the nth RX line and the first reference voltage; The first-1 amplifier is configured to amplify and output the signal from the first-1 differential amplifier; The first and second amplifiers are configured to amplify and output the signal from the first and second differential amplifiers; The first-1 integrator is configured to integrate and output the difference between the signal amplified by the first-1 amplifier and the second reference voltage which is lower than the first reference voltage; The first and second integrators are configured to integrate and output the difference between the signal amplified by the first and second amplifiers and the first reference voltage. as well as The second differential amplifier is configured to amplify and output the difference between the signal output from the first-1 integrator and the signal output from the first-2 integrator.

8. The touch sensor driving circuit according to claim 1, wherein the sensing circuit comprises: The first-1 differential amplifier is configured to amplify and output the difference between the voltage of the second touch electrode sensed through the nth RX line and the second reference voltage; The first and second differential amplifiers are configured to amplify and output the difference between the voltage of the second touch electrode sensed through the (n+1)th RX line and the first reference voltage; The first-1 amplifier is configured to amplify and output the signal from the first-1 differential amplifier; The first and second amplifiers are configured to amplify and output the signal from the first and second differential amplifiers; The first-1 integrator is configured to integrate and output the difference between the signal amplified by the first-1 amplifier and the first reference voltage; The first and second integrators are configured to integrate and output the difference between the signal amplified by the first and second amplifiers and the first reference voltage. as well as The second differential amplifier is configured to amplify and output the difference between the signal output from the first-1 integrator and the signal output from the first-2 integrator.

9. A touch sensor driving circuit, comprising: The driving circuit is configured to apply driving signals to a first touch electrode arranged in the display area via multiple TX lines; as well as The sensing circuit is configured to sense the voltage of a second touch electrode disposed in a first region and a second region within the display area via a first RX line and a second RX line, respectively, the voltage being generated by the drive signal. The sensing circuit is configured to sense the voltage difference between two RX lines located closest to the plurality of TX lines and situated on the outermost TX lines.

10. The touch sensor driving circuit of claim 9, wherein the driving circuit is configured to sequentially apply the driving signal from the relatively outermost TX line of the plurality of TX lines toward the TX line in the central region of the plurality of TX lines, and to apply the driving signal to each pair of TX lines located at the respective outermost points.

11. The touch sensor driving circuit of claim 9, wherein the sensing circuit includes a plurality of first terminals and a plurality of second terminals, the first RX lines being sequentially connected to the plurality of first terminals, and the second RX lines being connected to the plurality of second terminals in reverse order.

12. A display device, comprising: The display panel contains multiple pixels; A touch panel is disposed on the display panel and includes a plurality of first touch electrodes and a plurality of second touch electrodes, a plurality of TX lines and a plurality of RX lines, wherein the plurality of first touch electrodes and the plurality of second touch electrodes are arranged in a display area divided into a first area and a second area, the plurality of TX lines are connected to the plurality of first touch electrodes, and the plurality of RX lines are connected to the plurality of second touch electrodes. as well as A touch sensor driver is connected to the first touch electrode and the second touch electrode. The touch sensor driver mentioned above includes: The driving circuit is configured to apply a driving signal to the first touch electrode through the plurality of TX lines; as well as The sensing circuit is configured to sense the voltage of the second touch electrode arranged in the first region and the voltage of the second touch electrode arranged in the second region, respectively, via a first RX line and a second RX line, wherein the voltage is generated by the drive signal. The sensing circuit is configured to amplify or integrate the voltage difference between a voltage sensed by an nth RX line located on the outermost TX conductor closest to the plurality of TX lines and a second reference voltage, and to amplify or integrate the voltage difference between a voltage sensed by an (n+1)th RX line adjacent to the nth RX line and a first reference voltage different from the second reference voltage.

13. The display device of claim 12, wherein the sensing circuit comprises: The first-1 differential amplifier is configured to amplify and output the difference between the voltage of the second electrode sensed through the nth RX line and the first reference voltage; The first and second differential amplifiers are configured to amplify and output the difference between the voltage of the second electrode sensed through the (n+1)th RX line and the first reference voltage; The first-1 amplifier is configured to amplify and output the signal from the first-1 differential amplifier; The first and second amplifiers are configured to amplify and output the signal from the first and second differential amplifiers; The first-1 integrator is configured to integrate and output the difference between the signal amplified by the first-1 amplifier and the second reference voltage which is higher than the first reference voltage; The first and second integrators are configured to integrate and output the difference between the signal amplified by the first and second amplifiers and the first reference voltage. as well as The second differential amplifier is configured to amplify and output the difference between the signal output from the first-1 integrator and the signal output from the first-2 integrator.

14. The display device of claim 13, wherein the first-1 integrator comprises an operational amplifier, a resistor, and a capacitor, and The operational amplifier includes an inverting input terminal connected to the resistor and a non-inverting input terminal connected to a power supply line to which the second reference voltage is applied. The resistor is connected between the nth RX line and the inverting input terminal of the operational amplifier, and The capacitor is connected to the inverting input terminal of the operational amplifier.

15. The display device according to claim 14, wherein the first-1 integrator further comprises a first switch and a second switch. The first switch is connected between the non-inverting input terminal of the operational amplifier and the power supply line to which the first reference voltage is applied, and The second switch is connected between the non-inverting input terminal of the operational amplifier and the power supply line to which the second reference voltage is applied.

16. The display device of claim 15, wherein each of the first switch and the second switch includes a first contact connected to the non-inverting input terminal of the operational amplifier, a second contact connected to the power supply line to which the first reference voltage is applied, and a third contact connected to the power supply line to which the second reference voltage is applied.

17. The display device of claim 16, wherein the driving circuit is configured to connect the first contact point to the second contact point when the amplitude of the edge capacitance generated in the RX line is less than a predetermined threshold, and to connect the first contact point to the third contact point when the amplitude of the edge capacitance generated in the RX line is equal to or greater than the threshold.

18. The display device of claim 12, wherein the sensing circuit comprises: The first-1 differential amplifier is configured to amplify and output the difference between the voltage of the second touch electrode sensed through the nth RX line and the second reference voltage; The first and second differential amplifiers are configured to amplify and output the difference between the voltage of the second touch electrode sensed through the (n+1)th RX line and the first reference voltage; The first-1 amplifier is configured to amplify and output the signal from the first-1 differential amplifier; The first and second amplifiers are configured to amplify and output the signal from the first and second differential amplifiers; The first-1 integrator is configured to integrate and output the difference between the signal amplified by the first-1 amplifier and the first reference voltage; The first and second integrators are configured to integrate and output the difference between the signal amplified by the first and second amplifiers and the first reference voltage. as well as The second differential amplifier is configured to amplify and output the difference between the signal output from the first-1 integrator and the signal output from the first-2 integrator.

19. A display device, comprising: The display panel contains multiple pixels; A touch panel is disposed on the display panel and includes a plurality of first touch electrodes and a plurality of second touch electrodes, a plurality of TX lines and a plurality of RX lines. The plurality of first touch electrodes and the plurality of second touch electrodes are arranged in a display area divided into a first area and a second area. The plurality of TX lines are connected to the plurality of first touch electrodes and the plurality of RX lines are connected to the plurality of second touch electrodes. as well as A touch sensor driver is connected to the first touch electrode and the second touch electrode. The touch sensor driver mentioned above includes: The driving circuit is configured to apply a driving signal to the first touch electrode through the plurality of TX lines; as well as The sensing circuit is configured to sense the voltage of the second touch electrode arranged in the first region and the voltage of the second touch electrode arranged in the second region, respectively, via a first RX line and a second RX line, wherein the voltage is generated by the drive signal. The sensing circuit is configured to sense the voltage difference between two RX lines located closest to the plurality of TX lines and situated on the outermost TX lines.

20. The display device of claim 19, wherein the driving circuit is configured to sequentially apply the driving signal from the relatively outermost TX line of the plurality of TX lines toward the TX line in the central region of the plurality of TX lines, and to apply the driving signal to each pair of TX lines located at the respective outermost points.

21. The display device of claim 19, wherein the sensing circuit includes a plurality of first terminals and a plurality of second terminals, the first RX lines being sequentially connected to the plurality of first terminals, and the second RX lines being connected to the plurality of second terminals in reverse order.

22. The display device of claim 12, wherein the sensing circuit comprises: The first-1 differential amplifier is configured to amplify and output the difference between the voltage of the second touch electrode sensed through the (n+1)th RX line and the first reference voltage; The first and second differential amplifiers are configured to amplify and output the difference between the voltage of the second touch electrode sensed by the nth RX line and the first reference voltage; The first-1 amplifier is configured to amplify and output the signal from the first-1 differential amplifier; The first and second amplifiers are configured to amplify and output the signal from the first and second differential amplifiers; The first-1 integrator is configured to integrate and output the difference between the signal amplified by the first-1 amplifier and the second reference voltage which is lower than the first reference voltage; The first and second integrators are configured to integrate and output the difference between the signal amplified by the first and second amplifiers and the first reference voltage. as well as The second differential amplifier is configured to amplify and output the difference between the signal output from the first-1 integrator and the signal output from the first-2 integrator.

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