Method of cancelling noise and touch detection device performing the same

Abstract

A touch detection device comprises: a panel including a plurality of electrodes regularly arranged along a plurality of rows and columns; a multiplexer configured to be connected to electrodes corresponding to a plurality of rows and a plurality of data lines for each column; and a sensor driver configured to detect a touch input applied to a specific row through a sensing voltage while a driving voltage or ground potential having a waveform of a specific period is applied to rows adjacent to the specific row. A specific number of data lines may be arranged in the lower region of the lower left electrode among the electrodes where the sensing voltage is detected.

Description

Technology Field

[0001] The present invention relates to a method and apparatus for noise removal in a touch screen. More specifically, it relates to a noise removal method for improving touch sensitivity and a touch detection apparatus for performing the same. Background Technology

[0002] A touch panel includes a plurality of electrodes. An object, such as a finger or a stylus, provides input by changing the capacitance between itself and the electrodes included in the touch panel. In order for the touch panel to detect the input provided by the touch object, a driving circuit must apply a driving signal.

[0003] In this regard, a driving voltage may be applied to an adjacent channel of a sensing channel to sense a touch input by a touch object in a sensing channel of a specific row and column among multiple electrodes. As the driving voltage is applied to the adjacent channels on one side and the other side of the sensing channel in a symmetrical structure, the parasitic capacitance values ​​between the channels also occur in a symmetrical structure. Accordingly, the electromagnetic distribution between the sensing channel and the adjacent channel is also formed in a symmetrical structure, and touch sensitivity can be improved.

[0004] However, as adjacent channels are placed on only one side of the electrodes at the corners of the touch panel, the driving voltage is applied in an asymmetric structure. Consequently, the electromagnetic distribution between the sensing channel and the adjacent channel is formed in an asymmetric structure, causing a problem in which touch sensitivity is reduced in the area adjacent to the corners. The problem to be solved

[0005] The problem to be solved by the present invention is to resolve these difficulties. The problem to be solved by the present invention is to provide a noise removal method and a touch detection device that performs the same.

[0006] The problem to be solved by the present invention is to resolve the issue where touch sensitivity is reduced in the area adjacent to the corners due to the electromagnetic distribution between the sensing channel and the adjacent channel being formed in an asymmetrical structure. means of solving the problem

[0007] A noise removal method and a touch detection device for performing the same according to the present invention include: a panel comprising a plurality of electrodes regularly arranged along a plurality of rows and columns; a multiplexer configured to be connected to electrodes corresponding to a plurality of rows and a plurality of data lines for each column; and a sensor driving unit configured to detect a touch input applied to a specific row through a sensing voltage while a driving voltage or ground potential having a waveform of a specific period is applied to rows adjacent to the specific row. Among the electrodes, a specific number of data lines may be arranged in the lower region of the lower-left electrode where the sensing voltage is detected. The driving voltage or ground potential may be applied to the specific number of data lines through a compensated pattern differently from other data lines.

[0008] According to an embodiment, the sensor driver includes a digital-to-analog converter (DAC) that converts a digital signal into an analog signal; and a repair switch (DRSW) configured to cut off the electrical connection between the digital-to-analog converter and the specific data lines when a short circuit occurs in the specific data lines. The specific number of data lines may be connected to the pins of the repair switch (DRSW).

[0009] According to an embodiment, the sensor driving unit can control the repair switch to apply the sensing voltage to the lower left electrode and apply the driving voltage or the ground potential to the specific number of data lines.

[0010] According to an embodiment, the sensor driving unit may further include a driving voltage control unit that applies the driving voltage to some of the specific number of data lines to form an electromagnetic distribution with a symmetric structure with respect to the lower left electrode. The specific number of data lines are connected to the driving voltage control unit so that the driving voltage is applied to the first and second lines among the specific number of data lines, and the specific number of data lines can be connected to ground through the repair switch and the compensation pattern so that the ground potential is applied to the third line among the specific number of data lines.

[0011] According to an embodiment, the specific number of data lines in the lower region of the lower left electrode may be set to 3 or 5. The 3 or 5 data lines may be connected to the driving voltage control unit or connected to the ground through the compensation pattern.

[0012] According to an embodiment, the sensor driving unit acquires data voltages converted into an analog signal form through the digital-to-analog converter, and if the data voltage corresponding to the lower left electrode is greater than or equal to a reference value, it can connect two of the three data lines to the driving voltage control unit and control the last of the three data lines to be connected to the ground through the compensation pattern.

[0013] According to an embodiment, the sensor driving unit acquires data voltages converted into an analog signal form through the digital-to-analog converter while the three data lines are connected to the driving voltage control unit or the ground, and if the data voltage corresponding to the lower left electrode is greater than or equal to a second reference value, it can control the two lines adjacent to the lower left electrode among the five data lines to be connected to the driving voltage control unit and the remaining three lines to be connected to the ground through the compensation pattern.

[0014] According to an embodiment, the sensor driving unit applies a sensing signal as the sensing voltage to a specific row on the left, applies reverse signals with the opposite phase to the sensing signal as the driving voltage to rows adjacent to the specific row, and controls three or five data lines in the lower region of the electrode at the bottom left to be connected to the driving voltage control unit or connected to the ground through the compensation pattern. When a potential value greater than a reference value is detected in the rows to which the reverse signals are applied, the sensor driving unit stores the inverse phase touch coordinate value and the potential value to which the potential value greater than the reference value was detected, and while changing the rows to which the sensing signal is applied, determines whether the inverse phase touch coordinate value is included in the detected normal touch coordinate values, and if the inverse phase touch coordinate value is included in the normal touch coordinate values, the touch input for the rows corresponding to the inverse phase touch coordinate value can be determined as a floating touch input.

[0015] According to an embodiment, the sensor driving unit may apply a ground potential to the remaining rows outside the adjacent rows while the sensing signal and the reverse signals are applied, and apply a reverse voltage of the opposite phase to the specific row and the adjacent rows of the column adjacent to the column to which the sensing signal is applied. Effects of the invention

[0016] The technical effects of the noise removal method and the touch detection device performing the same according to the present invention can be summarized as follows, but are not limited thereto.

[0017] According to the present invention, a noise removal method and a touch detection device for performing the same can be provided by forming a compensation pattern adjacent to an electrode at a corner portion.

[0018] According to the present invention, three or five data lines are arranged in the lower region of the lower left electrode to improve touch sensitivity.

[0019] According to the present invention, by increasing the number of data lines of the dummy structure, the imbalance in touch sensitivity can be further resolved and the touch sensitivity can be further improved.

[0020] According to the present invention, touch sensitivity imbalance is resolved and touch sensitivity is improved through data lines of a dummy structure to which a compensation pattern is applied, thereby enabling more accurate determination of subsequent floating touch inputs. Brief explanation of the drawing

[0021] FIG. 1 is a drawing showing a touch detection device according to the present specification. FIG. 2 is a drawing showing the detailed configuration of a sensor driving unit in a touch detection device according to the present specification. FIG. 3 shows a block diagram of a touch detection device having a plurality of electrodes arranged along a plurality of rows and columns. FIG. 4 is an enlarged view of a plurality of electrodes arranged along a plurality of rows and columns of the touch detection device of FIG. 3. Figure 5 shows a configuration in which a sensing voltage is applied to the electrodes of a sensing channel and a driving voltage is applied to the electrodes of an adjacent channel. Figure 6 shows the voltages applied to a specific channel and adjacent channels in a structure that senses a specific channel rather than the bottom in the row direction. Figure 7 shows the electromagnetic distribution formed in the sensing channel at the corner and the adjacent channels around it, and the applied voltages. Figure 8 shows the distribution of DAC values ​​output from the DAC as a sensing voltage is applied to electrodes arranged in multiple rows and columns. Figure 9 shows a structure in which lines corresponding to a specific number of electrodes in the lower left part are formed as a compensation pattern. Figure 10 shows the structure of a touch panel in which multiple electrodes are arranged along multiple rows and columns. Figure 11 is an enlarged view of area (A) of Figure 10. Figure 12 shows the DAC values ​​of cells corresponding to multiple rows and columns on a touch panel to which the compensation pattern of Figure 9 has been added. FIG. 13 shows a structure for determining a floating touch object by applying a sensing voltage, a driving voltage in the form of a reverse signal in reverse phase, and a ground potential to electrodes of multiple rows and columns. Specific details for implementing the invention

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0023] Hereinafter, a noise removal method according to the present invention and a touch detection device for performing the same will be described. The touch detection device corresponds to a display device that performs a touch function and a noise removal method on a touch screen. In this regard, FIG. 1 is a drawing showing a touch detection device according to the present specification.

[0024] Referring to FIG. 1, a touch detection device (10) may include a display panel (100), a gate driver (120), a sensor driver (data driver) (300), and a controller (400). A plurality of gate lines (GL) and a plurality of data lines (DL) may be connected to the display panel (100). A plurality of subpixels (SP) may be arranged in a matrix form on the display panel (100). The gate driver (120) may be configured to drive a plurality of gate lines (GL). The sensor driver (data driver) (300) may be configured to supply data voltage through a plurality of data lines (DL). The controller (140) may be configured to control the sensor driver (data driver) (300).

[0025] FIG. 2 is a diagram showing the detailed configuration of a sensor driver in a touch detection device according to the present specification. Referring to FIG. 2, the sensor driver (300) is connected to a first node (N1) of a subpixel (SP) through a data line (DL) and can supply a data voltage (Vdata) converted into an analog signal form through a digital-to-analog converter (DAC) to the data line (DL). The switching transistor (SWT) of the subpixel (SP) is positioned between the data line (DL) and the first node (N1) and is turned on by a scan signal (SCAN) supplied from the gate line (GL) to transmit the data voltage (Vdata) supplied from the data line (DL) to the first node (N1), which is the gate node of the driving transistor (DRT).

[0026] The sensor driver (300) can detect whether a signal line (e.g., data line, reference line, driving voltage line, etc.) placed in the subpixel (SP) is defective and can perform a line compensation function to repair the defective signal line. For example, the defect in the signal line may be a short circuit defect between a data line (DL) and another adjacent data line (DL), or a short circuit defect between a data line (DL) and an adjacent driving voltage line (VL). Additionally, the sensor driver (300) can perform repair on the data line (DL) where the short circuit defect occurred.

[0027] The sensor driving unit (300) may further include a driving voltage control unit (300) and a compensated pattern (CP) to perform a line compensation function. The driving voltage control unit (300) may be connected to a data line (DL) through a line sampling switch (SAM_L). The driving voltage control unit (300) may be connected to another data line (DL) of an adjacent subpixel. For example, the driving voltage control unit (300) may be connected to adjacent data lines (DL) among a plurality of data lines (DL).

[0028] The touch detection device of FIGS. 1 and 2 may have a plurality of electrodes arranged along a plurality of rows and columns. In this regard, FIG. 3 shows a block diagram of a touch detection device having a plurality of electrodes arranged along a plurality of rows and columns. FIG. 4 is an enlarged view of the plurality of electrodes arranged along a plurality of rows and columns of the touch detection device of FIG. 3.

[0029] Referring to FIG. 3, the touch detection device (10) may be configured to include a panel (100), a multiplexer (200), and a sensor driving unit (300). The touch detection device (10) may include a panel (100) comprising a plurality of electrodes arranged regularly along rows and columns, a switch (200) that electrically connects some of the electrodes to form a plurality of sensing channels (110a to 110d), and a sensor driving unit (300) that provides a driving signal to the sensing channels (110a to 110d).

[0030] The switch (200) can be connected to electrodes (110, 120, 130, 140) placed in a specific column through connection lines (CL1, CL2, CL3, CL4). The sensor driver (300) can be operably coupled to the switch (200). The sensor driver (300) can control the application of a driving signal of a voltage waveform of a specific period to the electrodes (110, 120, 130, 140).

[0031] The connection lines (CL1) of the first column may include the first to tenth connection lines (CL10 to CL19). The connection lines (CL2) of the second column may include the first to tenth connection lines (CL20 to CL29). The connection lines (CL3) of the third column may include the first to tenth connection lines (CL30 to CL39). The connection lines (CL3) of the third column may include the first to tenth connection lines (CL30 to CL39). The lengths of the connection lines (CL1, CL2, CL3, CL4) may be set differently depending on the position of the electrodes placed in a specific row.

[0032] The number of multiple rows of electrodes is not limited to 10 and can be changed depending on the application. Referring to FIG. 4, the number of multiple rows and columns of electrodes can be configured to be 25 and 20, respectively. A sensing voltage may be applied to the electrode of a sensing channel in a specific row among the multiple rows of a specific column, and a driving voltage may be applied to the electrodes of an adjacent channel. In this regard, FIG. 5 shows a configuration in which a sensing voltage is applied to the electrode of a sensing channel and a ground potential or driving voltage is applied to the electrodes of an adjacent channel.

[0033] FIG. 5(a) shows the electromagnetic field distribution between the sensing channel and the surroundings as a sensing voltage (Vpre) is applied to the electrode of the sensing channel sensing a touch object and a ground potential is applied to an adjacent channel. FIG. 5(b) shows the electromagnetic field distribution between the sensing channel and the surroundings as a sensing voltage (Vpre) is applied to the electrode of the sensing channel sensing a touch object and a driving voltage (Vdrv) is applied to an adjacent channel.

[0034] With reference to FIGS. 1 to 5, a noise removal method and a touch detection device for performing the same according to the present specification will be described. In this regard, a sensing voltage (Vpre) and a driving voltage (Vdrv) value are required to obtain a DAC value corresponding to a data voltage output from a digital-to-analog converter (DAC). A signal of the sensing voltage (Vpre) is applied to a cell (electrode) to be sensed for detecting a touch, and the driving voltage (Vdrv) is applied to N cells in the upper and lower sections to improve the sensing sensitivity.

[0035] In this regard, when a driving signal of the same potential is applied to the sensor electrode corresponding to the sensing channel and to the adjacent electrode, the abnormal charge amount (Q) between the electrodes approaches zero. Therefore, the electric field of the sensor electrode can be coupled with a conductive object such as a finger to increase sensitivity. When a ground potential is applied to the adjacent electrode of the sensor electrode, the strong coupling between the sensor electrode and the adjacent electrode reduces the electromagnetic field to a conductive object such as a finger. A parasitic capacitance (Cp) component is generated by the sensor electrode on the touch panel due to its structure.

[0036] In this regard, if the sensing channel is a cell other than the bottom in the row direction, the voltage application structure for touch detection can be formed as a symmetric structure. FIG. 6 shows the voltages applied to a specific channel and adjacent channels in a structure that senses a specific channel other than the bottom in the row direction. Referring to FIG. 4 and FIG. 6, a sensing voltage (Vpre) can be applied to row 8 on the left, and a driving voltage (Vdrv) can be applied to rows 6, 7, 9, and 10, which are adjacent channels. A ground potential can be applied to rows 5 and 10, which are adjacent to rows 6, 7, 9, and 10, which are adjacent channels.

[0037] Meanwhile, when designing the touch sensor, the bottom-left cell is located at the corner of the touch panel, so there are no touch sensors in the surrounding adjacent channels. In this regard, FIG. 7 shows the electromagnetic distribution and applied voltages formed in the sensing channel at the corner and the surrounding adjacent channels.

[0038] FIG. 7(a) shows the electromagnetic field distribution of an asymmetric structure between the sensing channel and the surroundings as a sensing voltage (Vpre) is applied to the electrode of the sensing channel that senses a touch object and a driving voltage (Vdrv) is applied to an adjacent channel on one side. Referring to FIG. 7(b), when a sensing voltage (Vpre) is applied to the electrode in row 24 at the bottom left, the voltage is applied in an asymmetric structure. A driving voltage (Vdrv) is applied to rows 22 and 23 at the top, which are adjacent to one side of row 24 at the bottom. A ground potential is applied to row 21, which is adjacent to row 22. Therefore, as the driving voltage (Vdrv) is applied in an asymmetric structure only to one side of row 24, which is the sensing channel to which the sensing voltage (Vpre) is applied, an electromagnetic field distribution in an asymmetric structure is formed.

[0039] In this regard, the electromagnetic distribution caused by the driving voltage (Vdrv) of the sensing channel at the corner of the touch panel is different from that of other cells. Therefore, a deviation occurs in the DAC value of the sensing channel with an asymmetric structure at the corner compared to the DAC value of the sensing channel with a symmetric structure. In this regard, FIG. 8 shows the distribution of DAC values ​​output from the DAC as a sensing voltage is applied to electrodes arranged in multiple rows and columns.

[0040] Figure 8 shows the distribution of DAC values ​​output from the DAC as a sensing voltage is applied to electrodes arranged in multiple rows and columns. Referring to Figures 4 and 8, the DAC value of the electrode in the 24th row and 0th column, which is the bottom left, exceeds the reference value. Consequently, the DAC value of the bottom left cell is detected to be relatively higher than that of other cells in the same row, causing an imbalance in touch sensitivity.

[0041] Meanwhile, deviations in the DAC values ​​of the sensing channels at the corners of the touch panel are not limited to the lower-left corner but may occur at other corners as well. In this regard, deviations in DAC values ​​may also occur in the sensing channels at the upper-left, upper-right, and lower-right corners.

[0042] Meanwhile, a noise removal method according to the present specification and a touch detection device for performing the same will be described in detail with reference to the drawings. In this regard, FIG. 9 shows a structure in which lines corresponding to a specific number of electrodes in the lower left portion are formed as a compensation pattern.

[0043] Referring to FIG. 9, repair switches (DRSW) may be placed in rows 25, 26, and 27 adjacent to the electrode in row 24 at the bottom left. A driving voltage (Vdrv) or a ground potential is applied to the pins of the repair switches (DRSW) placed in rows 25, 26, and 27, thereby generating additional parasitic capacitance (Cp) between compensation patterns (CP). Accordingly, an electromagnetic distribution is formed in a symmetrical structure by the parasitic capacitance (Cp) generated in a symmetrical structure, thereby preventing touch sensitivity imbalance and achieving touch sensitivity improvement.

[0044] In this regard, FIG. 10 shows the structure of a touch panel in which multiple electrodes are arranged along multiple rows and columns. Referring to FIG. 10, area (A) corresponds to an area in which compensation patterns are formed in the lower left and lower left lower regions. FIG. 11 is an enlarged view of area (A) of FIG. 10.

[0045] Referring to FIGS. 10 and 11, a compensation pattern (CP) is added around the cell at the bottom left to form a structure that surrounds up to three cells in the lower region of the cell at the bottom left. Three cells may be placed in the lower region of the cell at the bottom left to compensate for the electromagnetic distribution of an asymmetric structure occurring in the cell at the bottom left.

[0046] The compensation pattern (CP) can be directly connected to the pins of the TDI (Test Data In) through the repair switch (DRSW). Referring to FIGS. 2 through 11, a driving voltage (Vdrv) or ground potential can be applied through the repair switch (DRSW). If there are insufficient pins of the TDI, the compensation pattern (CP) can be formed in a floating state not connected to the pins of the TDI.

[0047] The noise removal method and the touch detection device performing the same according to the present specification can prevent touch sensitivity imbalance and achieve touch sensitivity improvement by reducing the DAC value of the cells in the corner portions through a compensation pattern (CP). In this regard, FIG. 12 shows the DAC values ​​of cells corresponding to a plurality of rows and columns on a touch panel to which the compensation pattern of FIG. 9 has been added. Referring to FIG. 8 and FIG. 12, the DAC value of the cell in row 24 of the lower left corner is reduced from 738 to 456, thereby preventing touch sensitivity imbalance and achieving touch sensitivity improvement.

[0048] Hereinafter, a noise removal method and a touch detection device for performing the same claimed through the present invention will be described with reference to FIGS. 1 to 12. Referring to FIGS. 1 to 12, the touch detection device (10) may include a panel (100), a multiplexer (200), and a sensor driving unit (300).

[0049] The panel (100) may be configured to include a plurality of electrodes arranged regularly along a plurality of rows and columns. The multiplexer (200) may be configured to be connected to electrodes corresponding to a plurality of rows for each column through a plurality of data lines (DL). The sensor driver (300) may be configured to detect a touch input applied to a specific row through a sensing voltage (Vpre) while a driving voltage or ground potential having a waveform of a specific period is applied to rows adjacent to the specific row. The sensor driver (300) may control the panel (100) and the multiplexer (200) to detect the sensing voltage (Vpre) while the driving voltage or ground potential is applied.

[0050] A specific number of data lines may be placed in the lower region of the lower-left electrode where the sensing voltage (Vpre) is detected among the electrodes. For example, three data lines may be placed in the lower region of the electrode at column 0 and row 24 of the lower-left. The specific number of data lines may be connected to ground through a compensation pattern (CP) differently from other data lines.

[0051] The sensor driver (300) may include a digital-to-analog converter (DAC) and a repair switch (DRSW). The digital-to-analog converter (DAC) may be configured to convert a digital signal into an analog signal. The repair switch (DRSW) may be configured to cut off the electrical connection between the digital-to-analog converter (DAC) and the specific data lines when a short circuit occurs in the specific data lines. A specific number of data lines in the lower region of the lower left electrode may be connected to the pins of the repair switch (DRSW).

[0052] The sensor driving unit (300) can apply a sensing voltage (Vpre) to the lower left electrode. The sensor driving unit (300) can control the repair switch (DRSW) so that a driving voltage (Vdrv) or ground potential is applied to a specific number of data lines.

[0053] The sensor driving unit (300) may further include a driving voltage control unit (310). The driving voltage control unit (310) applies a driving voltage to some of a specific number of data lines to form an electromagnetic distribution with a symmetrical structure with respect to the lower left electrode.

[0054] A driving voltage application unit (310) configured to apply the driving voltage such that parasitic capacitance occurs between adjacent lines among a plurality of data lines may be further included. A specific number of data lines may be connected to the driving voltage control unit (310) so that the driving voltage (Vdrv) is applied to the first and second lines among a specific number of data lines in the lower region of the lower left electrode. A specific number of data lines may be connected to ground through a repair switch (DRSW) and a compensation pattern (CP) so that the ground potential is applied to the third line among a specific number of data lines in the lower region.

[0055] A first and second line may be positioned adjacent to the electrode of row 24 at the bottom left so that a driving voltage (Vdrv) can be applied. A third line may be positioned adjacent to the second line to which the driving voltage (Vdrv) is applied so that a ground potential can be applied. A specific number of data lines in the lower region of the electrode at the bottom left may be set to 3 or 5. The 3 or 5 data lines may be connected to the driving voltage control unit (310) or connected to ground through a compensation pattern (CP).

[0056] Meanwhile, the noise removal method and the touch detection device performing the same according to the present specification may implement an inverse phase driving method for determining a small object in a floating state (earphone cord, coin, key, etc.). In this regard, FIG. 13 shows a structure for determining a floating touch object by applying a sensing voltage, a driving voltage in the form of an inverse phase reverse signal, and a ground potential to electrodes of a plurality of rows and columns. Referring to FIGS. 1 to 13, three or five data lines are arranged in the lower region of the electrode at the bottom left, thereby enabling improved touch sensitivity.

[0057] With reference to FIGS. 1 to 13, a noise removal method and a touch detection device for performing the same according to the present specification will be described. A sensor driving unit (300) can acquire data voltages converted into an analog signal form through a digital-to-analog converter (DAC). If the data voltage corresponding to the electrode at the lower left is greater than or equal to a reference value, the sensor driving unit (300) can connect two of the three data lines to a driving voltage control unit (310). Additionally, the sensor driving unit (300) can control the last of the three data lines to be connected to ground (ground potential is applied) through a compensation pattern (CP).

[0058] The sensor driving unit (300) can acquire data voltages converted into analog signal forms through a digital-to-analog converter (DAC) while three data lines are connected to the driving voltage control unit (310) or ground. The sensor driving unit (300) can determine whether the data voltage corresponding to the electrode at the bottom left is greater than or equal to a second reference value. The second reference value for using five data lines can be set to a lower value than the reference value for using three data lines. Accordingly, the number of data lines in the dummy structure can be increased to further resolve touch sensitivity imbalance and further improve touch sensitivity.

[0059] If the data voltages are greater than or equal to the second reference value, the sensor driving unit (300) can connect two of the five data lines adjacent to the lower left electrode to the driving voltage control unit (310). Additionally, the sensor driving unit (300) can control the remaining three of the five data lines to be connected to ground through a compensation pattern (CP).

[0060] The sensor driving unit (300) can apply a sensing signal as a sensing voltage to a specific row on the left and apply reverse signals of opposite phase to the sensing signal as a driving voltage to rows adjacent to the specific row. The sensor driving unit (300) can connect three or five data lines in the lower region of the electrode on the lower left to the driving voltage control unit (310) or to ground through a compensation pattern (CP). By using data lines of a dummy structure, touch sensitivity imbalance is resolved and touch sensitivity is improved, thereby enabling more accurate determination of subsequent floating touch inputs.

[0061] The sensor driver (300) can more accurately determine floating touch inputs when touch sensitivity imbalance is resolved by using three or five data lines in the lower region of the electrode at the bottom left. When a potential value greater than a reference value is detected in the rows to which reverse signals are applied, the sensor driver (300) can store the inverse phase touch coordinate value and the potential value to which the potential value greater than the reference value is detected. The sensor driver (300) can determine whether inverse phase touch coordinate values ​​are included in the detected normal touch coordinate values ​​while changing the rows to which sensing signals are applied. If inverse phase touch coordinate values ​​are included in the normal touch coordinate values, the sensor driver (300) can determine that the touch input for the rows corresponding to the inverse phase touch coordinate values ​​is a floating touch input.

[0062] To accurately detect a floating touch input, driving signals may be applied to adjacent channels in adjacent rows and columns to surround the sensing channel to which the sensing signal is applied, as shown in FIG. 13. The sensor driving unit (300) may apply a ground potential to the remaining rows outside the adjacent rows while the sensing signal and reverse signals are applied. The sensor driving unit (300) may apply a reverse voltage of inverse phase to a specific row in the column adjacent to the column to which the sensing signal is applied and to adjacent rows.

[0063] The noise removal method according to the present invention and the touch detection device for performing the same have been described above. The technical effects of the noise removal method and the touch detection device for performing the same can be summarized as follows, but are not limited thereto.

[0064] According to the present invention, a noise removal method and a touch detection device for performing the same can be provided by forming a compensation pattern adjacent to an electrode at a corner portion.

[0065] According to the present invention, three or five data lines are arranged in the lower region of the lower left electrode to improve touch sensitivity.

[0066] According to the present invention, by increasing the number of data lines of the dummy structure, the imbalance in touch sensitivity can be further resolved and the touch sensitivity can be further improved.

[0067] According to the present invention, touch sensitivity imbalance is resolved and touch sensitivity is improved through data lines of a dummy structure to which a compensation pattern is applied, thereby enabling more accurate determination of subsequent floating touch inputs.

[0068] Although the present invention has been described above in relation to specific embodiments, this is merely illustrative and the present invention is not limited thereto. A person skilled in the art to which the present invention pertains may change or modify the described embodiments without departing from the scope of the present invention, and various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims set forth below. Explanation of the symbols

[0069] 10: Touch detection device 100: Display panel 200: Multiplexer 300: Sensor drive unit 400: Controller

Claims

Claim 1 A touch detection device for performing noise removal, comprising: a panel including a plurality of electrodes regularly arranged along a plurality of rows and columns; and a multiplexer configured to be connected to electrodes corresponding to a plurality of rows for each column through a plurality of data lines. A touch detection device comprising: a sensor driving unit configured to detect a touch input applied to a specific row through a sensing voltage while a driving voltage or ground potential having a specific periodic waveform is applied to rows adjacent to the specific row; wherein a specific number of data lines are arranged in the lower region of the lower-left electrode among the electrodes where the sensing voltage is detected, and the driving voltage or ground potential is applied to the specific number of data lines through a compensated pattern differently from other data lines; and further comprising a driving voltage control unit that forms an electromagnetic distribution with a symmetrical structure with respect to the lower-left electrode by applying the driving voltage to some of the specific number of data lines, wherein the specific number of data lines are connected to the driving voltage control unit so that the driving voltage is applied to the first and second lines among the specific number of data lines, and the specific number of data lines are connected to ground through a repair switch and the compensation pattern so that the ground potential is applied to the third line among the specific number of data lines. Claim 2 A touch detection device according to claim 1, wherein the sensor driving unit comprises: a digital-to-analog converter (DAC) that converts a digital signal into an analog signal; and a repair switch (DRSW) configured to cut off the electrical connection between the digital-to-analog converter and the specific data lines when a short circuit occurs in the specific data lines, and wherein the specific number of data lines are connected to the pins of the repair switch (DRSW). Claim 3 A touch detection device according to claim 2, wherein the sensor driving unit applies the sensing voltage to the lower left electrode and controls the repair switch so that the driving voltage or the ground potential is applied to the specific number of data lines. Claim 4 delete Claim 5 A touch detection device according to claim 1, wherein the specific number of data lines in the lower region of the lower left electrode are set to 3 or 5, and the 3 or 5 data lines are connected to the driving voltage control unit or connected to the ground through the compensation pattern. Claim 6 A touch detection device according to claim 1, wherein the sensor driving unit acquires data voltages converted into an analog signal form through a digital-to-analog converter, and if the data voltage corresponding to the lower left electrode is greater than or equal to a reference value, connects two of the three data lines to the driving voltage control unit and controls the last of the three data lines to be connected to the ground through the compensation pattern. Claim 7 A touch detection device according to claim 6, wherein the sensor driving unit acquires data voltages converted into an analog signal form through the digital-to-analog converter while the three data lines are connected to the driving voltage control unit or the ground, and if the data voltage corresponding to the lower left electrode is greater than or equal to a second reference value, the two lines adjacent to the lower left electrode among the five data lines are connected to the driving voltage control unit, and the remaining three lines are controlled to be connected to the ground through the compensation pattern. Claim 8 A touch detection device according to claim 1, wherein the sensor driving unit applies a sensing signal as the sensing voltage to a specific row on the left, applies reverse signals of the opposite phase to the sensing signal as the driving voltage to rows adjacent to the specific row, controls three or five data lines in the lower region of the electrode at the bottom left to be connected to the driving voltage control unit or connected to the ground through the compensation pattern, and when a potential value greater than a reference value is detected in the rows to which the reverse signals are applied, stores the inverse phase touch coordinate value and the potential value to which the potential value greater than the reference value is detected, determines whether the inverse phase touch coordinate value is included in the general touch coordinate values ​​detected while changing the rows to which the sensing signal is applied, and if the inverse phase touch coordinate value is included in the general touch coordinate value, determines the touch input for the rows corresponding to the inverse phase touch coordinate value as a floating touch input. Claim 9 A touch detection device according to claim 8, wherein the sensor driving unit applies a ground potential to the remaining rows outside the adjacent rows while the sensing signal and the reverse signals are applied, and applies a reverse voltage of inverse phase to the specific row and the adjacent rows of the column adjacent to the column to which the sensing signal is applied.

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