Touch sensing device and touch sensing system

Abstract

The present invention provides a touch sensing device and a touch sensing system. The present invention enables to increase the sensing sensitivity or the perception rate of a hovering active pen using a threshold value.

Description

Technical Field

[0001] This invention relates to technologies and touch sensing systems for sensing levitating active pens. Background Technology

[0002] The technology used to sense the touch or proximity of external objects to a touch panel is called touch sensing technology. In electronic devices using this technology, the touch panel is located in the same plane as the display panel, so users can input user operation signals into the touch panel while viewing an image on the display panel. Compared to other previous types of user operation signal input (such as mouse input or keyboard input), this method of generating user operation signals is very intuitive for users.

[0003] Taking advantage of these advantages, touch sensing technology is applied to various electronic devices, including display panels. A touch sensing device can sense the touch or proximity of an external object to a touch panel by supplying a drive signal to a drive electrode arranged in the touch panel and receiving a response signal formed in a sensing electrode arranged in the touch panel. Here, a capacitance is formed between the drive electrode and the sensing electrode, and changes in capacitance can indicate the touch or proximity of an external object to the touch panel.

[0004] Users can use an active pen and their finger to input user operation signals. Depending on how the user uses it, the active pen can touch or approach the touch panel. "Touching" can mean that the active pen actually contacts the surface of the touch panel, and "approaching" can mean that the active pen is near the surface of the touch panel, that is, within a predetermined distance relative to the surface of the touch panel without actually touching it. Whether the active pen touches or approaches the touch panel, it causes a change in the capacitance of the touch electrodes. However, the change is not very significant when approaching, while it is very significant when touching. In other words, the sensing signal of the active pen may be much weaker when approaching than when touching. A weak sensing signal may cause a decrease in the sensing sensitivity or perception rate of the active pen.

[0005] On the other hand, the active pen can hover over the touch panel. Similar to the proximity scenario, in the hovering case, the active pen can be positioned at a predetermined distance from the touch panel. However, because the active pen provides a touch signal based on the user's intention without contacting the touch panel surface when hovering, the hovering scenario may differ from a strictly proximity scenario. The sensing signal of a hovering active pen may be much weaker than that of an active pen during touch. A weak sensing signal may cause a decrease in the sensing sensitivity or perception rate of the hovering active pen.

[0006] Therefore, the present invention will provide a technique for increasing the sensing sensitivity or sensing rate of a hovering active pen. Summary of the Invention

[0007] In this context, aspects of the present invention provide a technique for sensing a levitating active pen by calculating a threshold.

[0008] Another aspect of the present invention provides a technique for sensing a hovering active pen by summing the sensing values ​​of a plurality of touch electrodes included in a touch area to calculate a threshold.

[0009] Therefore, in one aspect, the present invention provides a touch sensing device for receiving information from an active pen, the touch sensing device comprising: a sensing circuit for outputting sensing values ​​of downlink signals of each touch electrode in response to the active pen; a summing circuit for calculating a sum value by summing multiple sensing values; an average value calculation circuit for calculating an average value by averaging multiple sum values ​​calculated in different signal intervals; a deviation calculation circuit for calculating the deviation between the multiple sum values ​​and the average value; a threshold calculation circuit for calculating at least one threshold value using the deviation and the average value; and a control circuit for identifying the value of the downlink signal in each signal interval by comparing each sum value with the at least one threshold value, and identifying the information of the active pen using the signal values ​​in the multiple signal intervals.

[0010] The sensing circuit can output the sensed value when the active pen is suspended.

[0011] The at least one threshold may include a first threshold as a positive value and a second threshold as a negative value.

[0012] The threshold calculation circuit can use the average of the absolute values ​​of the deviations to calculate the threshold deviation value, and calculate the first threshold by summing the average value and the threshold deviation value.

[0013] The threshold calculation circuit can use the average of the absolute values ​​of the deviations to calculate the threshold deviation value, and calculate the second threshold by obtaining the difference between the average value and the threshold deviation value.

[0014] The deviation may include a positive deviation with a positive value and a negative deviation with a negative value, and the threshold calculation circuit may calculate the at least one threshold by averaging the absolute values ​​of the positive deviation and the negative deviation.

[0015] The sum value may include a positive sum value as a positive value and a negative sum value as a negative value, and the average value calculation circuit can calculate the average value by averaging the same number of positive sum values ​​and negative sum values.

[0016] The average value calculation circuit can use the sum of a signal interval with a fixed signal value or a predictable signal value to calculate the average value.

[0017] In another aspect, the present invention provides a touch sensing system, comprising: a panel having touch electrodes disposed thereon; an active pen for touching or approaching the panel; and a touch sensing device for outputting a sensing value of a downlink signal of the touch electrodes in response to the active pen, and using the sensing value and at least one threshold to identify the value of the downlink signal, wherein the touch sensing device calculates a sum value by summing a plurality of sensing values, and compares the sum value with the at least one threshold to identify the value of the downlink signal.

[0018] The touch sensing device can calculate an average value by averaging multiple sums, calculate the deviation between the multiple sums and the average value, and calculate at least one threshold value based on the average of the deviations.

[0019] The at least one threshold may include a first threshold as a positive value and a second threshold as a negative value.

[0020] The active pen can hover above the panel.

[0021] The touch electrodes can be arranged in a matrix to form multiple touch areas.

[0022] The multiple sum values ​​can be obtained in different signal ranges.

[0023] The touch sensing device can calculate the sum value by summing the sensing values ​​of N adjacent touch electrodes, where N is a natural number of 2 or greater.

[0024] As described above, the present invention allows the use of a threshold to increase the sensing sensitivity or sensing rate of the hovering active pen, and this increase in the sensing sensitivity of the hovering active pen enables faster touch sensing and improved ease of use. Attached Figure Description

[0025] The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 This is a structural diagram of a display device according to an embodiment;

[0027] Figure 2 This is a structural diagram of a touch sensing device according to an embodiment;

[0028] Figure 3This is a graph showing the suspended active pen and the sum value as a threshold according to an embodiment;

[0029] Figure 4 This is an example illustrating the process by which a touch sensing device calculates a sum and a threshold; and

[0030] Figure 5 This is a flowchart illustrating the calculation of the threshold used by the touch sensing device to sense the hovering active pen. Detailed Implementation

[0031] Figure 1 This is a structural diagram of a display device according to an embodiment.

[0032] refer to Figure 1 The display device 100 may include a panel 110, a data driving device 120, a gate driving device 130, a touch sensing device 140, a data processing device 150, and a host 160.

[0033] At least one of the data driving device 120, gate driving device 130, touch sensing device 140, and data processing device 150 may be referred to as a display driving device. For example, the data driving device 120 may be referred to as a display driving device, or a driving device including the data driving device 120 and the touch sensing device 140 may be referred to as a display driving device. One driving device may be included in another driving device. For example, the data driving device 120 may be included in the touch sensing device 140, or the gate driving device 130 may be included in the data driving device 120. According to an embodiment, only some components of one driving device may be included in another device.

[0034] The data driving device 120 can drive the data line DL connected to the pixel P, and the gate driving device 130 can drive the gate line GL connected to the pixel P. The touch sensing device 140 can drive the touch electrode TE arranged in the panel 110.

[0035] The data driving device 120 can supply data voltage to the pixel P via the data line DL to display an image. The data driving device 120 may include at least one integrated circuit, which may be connected to the bonding pad of the display panel 110 in a tape-on-board (TAB) or glass-on-chip (COG) manner, directly formed on the display panel 110, or integrated on the display panel 110 as appropriate. Alternatively, the data driving device 120 may be formed in a thin-film flip-chip (COF) manner.

[0036] The data driving device 120 can receive image data and data control signals (DCS) from the data processing device 150. The data driving device 120 can generate a data voltage based on the grayscale value of a pixel indicated by the image data and drive that pixel.

[0037] The data control signal (DCS) may include at least one synchronization signal. For example, the DCS may include a vertical synchronization signal (VSYNC), a horizontal synchronization signal (HSYNC), and a time-division signal. The data driving device 120 can recognize the frame segmentation indicated by the vertical synchronization signal and can drive pixels in intervals other than the vertical blanking interval indicated by the vertical synchronization signal. The data driving device 120 can recognize image data for each horizontal line pixel according to the horizontal synchronization signal and supply data voltage to the pixel through the horizontal line. The data driving device 120 can recognize the segmentation of the display interval and touch interval indicated by the time-division signal and drive pixels within the display interval.

[0038] The gate driving device 130 can supply a scan signal to pixel P via the gate line GL to turn the transistors arranged in each pixel P on and off. Depending on the driving method, the gate driving device 130 can be as follows: Figure 1 The gate drive device 130 is arranged on one side of the panel 110, or it can be divided into two and arranged on both sides of the panel 110. The gate drive device 130 may include at least one integrated circuit, and the at least one integrated circuit may be connected to the bonding pad of the display panel 110 by tape-on-board (TAB) or chip-on-glass (COG) type, directly formed on the display panel 110, or integrated on the display panel 110 as appropriate. In addition, the gate drive device 130 may be formed as chip-on-glass (COF) type.

[0039] The gate driving device 130 can receive a gate control signal GCS from the data processing device 150. The gate control signal GCS may include multiple clock signals. The gate driving device 130 can use the clock signals to generate a scan signal and supply the scan signal to the gate line GL.

[0040] Panel 110 may include a display panel and a touch panel (or touchscreen panel). The display panel and touch panel may share some components. For example, if the display panel is an LCD (liquid crystal display) panel, the touch electrode TE of the touch panel for sensing touch can be used as a common electrode in the display panel to which a common voltage is supplied. As another example, if the display panel is an OLED (organic light-emitting diode) panel, the touch electrode TE can be used as a cathode electrode in the display panel to which a base voltage is supplied. Considering that the display panel and touch panel share some components, such a panel 110 can be referred to as an "integrated panel." However, the invention is not limited to this. In addition, in-cell type panels that integrate the display panel and touch panel are known, but this is only an example of the panel 110 described above, and the panels to which the invention applies are not limited to in-cell type panels.

[0041] On panel 110, a plurality of touch electrodes TE are arranged, and touch sensing device 140 can drive the touch electrodes TE using touch drive signals. Touch sensing device 140 can generate sensing values ​​of the touch electrodes based on response signals formed in the touch electrodes TE in response to the drive signals. Touch sensing device 140 can use the sensing values ​​of the plurality of touch electrodes TE arranged on panel 110 to calculate the touch coordinates of object 20, and the calculated touch coordinates can be sent to other devices (e.g., host 160).

[0042] The touch sensing device 140 can send signals to or receive signals from the active pen 10 via the touch electrode TE. The touch sensing device 140 can supply uplink signals to the touch electrode TE, and the active pen 10 can receive the uplink signals by contacting or approaching the touch electrode TE. The uplink signals may include information such as panel information or protocol version, or synchronization signals. The active pen 10 can identify panel information or protocol version, or synchronize signals, by receiving the uplink signals.

[0043] The active pen 10 can send downlink signals to the touch electrode TE. The touch sensing device 140 can receive the downlink signals through the touch electrode TE. The downlink signals can include the active pen's status information. The active pen's status information can include, for example, the active pen's position, the status of the active pen's buttons, the active pen's battery status, or the active pen's tilt angle.

[0044] The active pen 10 can transmit downlink signals in different signal intervals. A frame may include a display interval and a touch interval, and the touch interval may include multiple signal intervals. The active pen 10 can transmit downlink signals to the touch electrodes TE arranged on the panel 110 in the downlink signal intervals of the multiple signal intervals.

[0045] A downlink signal received within a downlink signal interval can have a signal value. For example, a downlink signal can have a signal value of 1 or a signal value of 0 within a downlink signal interval, or a downlink signal can have a signal value of 2 within a downlink signal interval. The touch sensing device 140 can identify information about the active pen by examining the signal values ​​in different signal intervals.

[0046] Touch sensing device 140 can receive touch control signal TCS from data processing device 150. Touch control signal TCS may include at least one synchronization signal. For example, touch control signal TCS may include vertical synchronization signal VSYNC, time-division signal, or touch synchronization signal TSYNC, etc. Touch sensing device 140 can identify the division of display area and touch area indicated by time-division signal or touch synchronization signal TSYNC, and drive touch electrode TE in touch area.

[0047] Depending on the implementation, the synchronization signals may be the same as or different from each other. For example, the time-division signal may be the same as or different from the touch synchronization signal. Although specific names will be used below to describe the synchronization signals to emphasize their specific functions, the invention is not limited to such specific names.

[0048] Basically, a synchronization signal can be generated based on the panel control signal PCS supplied from the host 160 to the data processing device 150.

[0049] The host 160 can send image data and a vertical synchronization signal VSYNC, which indicates the segmentation of the image data by frame, to the data processing device 150. The data processing device 150 can generate a time-division signal or a touch synchronization signal TSYNC based on the vertical synchronization signal VSYNC and send them to the drive devices 120, 130, and 140.

[0050] Figure 2 This is a structural diagram of a touch sensing device according to an embodiment.

[0051] refer to Figure 2 The touch sensing device 140 may include a driving circuit 210, a sensing circuit 220, a summing circuit 230, an average value calculation circuit 240, a deviation calculation circuit 250, a threshold calculation circuit 260, and a control circuit 270. The touch sensing device 140, the touch electrode TE, and the active pen can form a touch sensing system.

[0052] The touch electrode TE can be a common electrode that supplies a common voltage in an LCD panel, or the touch electrode TE can be the cathode electrode of an OLED panel.

[0053] The drive circuit 210 can supply the uplink transmit signal UTX to the touch electrode TE during a first time interval. Here, the uplink transmit signal UTX is the uplink signal generated in the touch electrode TE. The active pen can receive the uplink signal from the touch electrode TE. The uplink signal generated in the active pen can be referred to as the uplink receive signal.

[0054] The sensing circuit 220 can receive a downlink receive signal DRX from the touch electrode TE during a second time interval that does not overlap with the first time interval. Here, the downlink receive signal DRX is a downlink signal formed in the touch electrode TE. The active pen can transmit a downlink signal to the touch electrode TE. The downlink signal formed in the active pen can be referred to as a downlink transmit signal.

[0055] When the active pen receives the uplink signal through the touch electrode TE and sends the downlink signal corresponding to the uplink signal to the touch sensing device 140, the sensing circuit 220 can output a sensing value that includes information from the active pen.

[0056] Here, the sensed value can be the magnitude or difference of capacitance formed between the touch electrode TE and the tip of the active pen when the active pen touches or approaches the touch electrode TE, or the difference of current or charge formed in the touch electrode TE by the downlink signal. When the sensing circuit 220 sends the sensed value to the control circuit 270, the control circuit 270 can determine the touch or approach of the active pen by the magnitude of the capacitance included in the sensed value, and use the sensed value to identify the signal value in each signal interval.

[0057] The sensing value of the touch electrode may change whenever the sensing circuit 220 receives a downlink signal that includes information about the active pen, such as its position, tilt, pen pressure, identifier, and battery status.

[0058] The touch sensing device 140 can determine the touch or proximity signal value of the active pen by comparing the sensed value with a threshold. For example, the touch sensing device 140 considers the sensed value valid and determines the presence of an active pen touch only when the sensed value of the touch electrode exceeds the threshold. In addition, the touch sensing device 140 can determine the signal value as 0 when the sensed value is equal to or higher than a first threshold (which is a positive value), determine the signal value as 1 when the sensed value is equal to or lower than a second threshold (which is a negative value), and determine the signal value as 2 when the sensed value is lower than the first threshold but higher than the second threshold.

[0059] When the active pen is hovering, the touch sensing device 140 can calculate a new threshold and compare the sensed value with the new threshold to determine the touch or proximity or recognition signal value of the active pen.

[0060] Specifically, the touch sensing device 140 can output multiple sensing values ​​from multiple touch electrodes in multiple touch areas, and calculate a sum value for each touch area by summing the multiple sensing values. Then, the touch sensing device 140 can calculate multiple sum values ​​in multiple signal intervals, calculate an average value based on the multiple sum values, and use the average value to calculate a threshold value to determine the touch or proximity or recognition signal value of the active pen by using the threshold value as a standard.

[0061] The summing circuit 230 can receive multiple sensed values ​​from the sensing circuit 220 and sum the multiple sensed values ​​to obtain a total value. The panel may include multiple touch electrodes TE, and some of the multiple touch electrodes TE may form a touch area. The sensed values ​​may be associated with each touch electrode TE, and the total value may be associated with a touch area including the multiple touch electrodes TE. The total value may be a value obtained by summing all the sensed values ​​of the multiple touch electrodes TE in a touch area.

[0062] The average value calculation circuit 240 can calculate the average value by averaging multiple sums. A frame may include multiple signal intervals. The average value calculation circuit 240 can calculate the average value by averaging the sums in some signal intervals.

[0063] The sum can be a positive sum or a negative sum. Regardless of whether the sum is positive or negative, the average calculation circuit 240 can calculate the average of multiple sums for multiple selected touch areas. Preferably, the average calculation circuit 240 can calculate the average by averaging the same number of positive sums and negative sums.

[0064] For example, the average value calculation circuit 240 can calculate the average value using the following Equation 1. The process of calculating the threshold using the sum of eight values ​​from eight signal intervals will be described below.

[0065] [Equation 1]

[0066]

[0067] Here, AvgValue refers to the average, and SumValue refers to the sum. The number of sums needed to calculate the average is not limited to 8 and can be more or less.

[0068] The deviation calculation circuit 250 can calculate the deviation using multiple sums and their average. The deviation calculation circuit 250 can calculate multiple deviations between multiple sums and their average.

[0069] For example, the deviation calculation circuit 250 can calculate multiple deviations using the following equation 2.

[0070] [Equation 2]

[0071] StdValue = SumValue - AvgValue

[0072] Here, StdValue refers to the deviation. The deviation calculation circuit 250 can calculate the eight deviations by calculating the difference between the average of the eight sums and each of the eight sums individually.

[0073] Deviations can include positive deviations with positive values ​​and negative deviations with negative values. As mentioned above, since the sum can be positive or negative, the deviation obtained by subtracting the average from the sum can also be positive or negative.

[0074] The threshold calculation circuit 260 can calculate at least one threshold using deviations and averages. Since deviations include both positive and negative deviations, the threshold calculation circuit 260 can take this characteristic into account when calculating the threshold. Specifically, the threshold calculation circuit 260 can calculate the sum of the absolute values ​​of positive deviations and the sum of the absolute values ​​of negative deviations, and use the average of the sum of the absolute values ​​of positive and negative deviations to calculate the threshold.

[0075] For example, the threshold calculation circuit 260 can use the following equation 3 to calculate the sum of positive deviations.

[0076] [Equation 3]

[0077]

[0078] Here, PosSum refers to the sum of positive deviations. The threshold calculation circuit 260 can sum only the positive deviations out of the eight deviations.

[0079] Alternatively, for example, the threshold calculation circuit 260 can use the following equation 4 to calculate the sum of negative deviations.

[0080] [Equation 4]

[0081]

[0082] Here, NegSum refers to the sum of negative deviations. The threshold calculation circuit 260 can sum only the negative deviations out of the eight deviations.

[0083] The threshold calculation circuit 260 can calculate the threshold by averaging the sum of the absolute values ​​of the positive deviations and the sum of the absolute values ​​of the negative deviations. For example, the threshold calculation circuit 260 can calculate the threshold using the following equation 5.

[0084] [Equation 5]

[0085]

[0086] Here, Threshold refers to the threshold value. The threshold calculation circuit 260 can obtain the threshold by subtracting the sum of negative deviations (NegSum) from the sum of positive deviations (PosSum) and dividing the result by 16. In other words, the threshold can be obtained by adding the sum of the absolute values ​​of the positive deviations to the sum of the absolute values ​​of the negative deviations and averaging the sum.

[0087] In addition, the threshold calculation circuit 260 can calculate a first threshold as a positive value and a second threshold as a negative value based on the threshold.

[0088] For example, the threshold calculation circuit 260 can calculate a first threshold by adding the average value to the threshold value as described in Equation 6 below, and calculate a second threshold value by subtracting the threshold value from the average value as described in Equation 7 below.

[0089] [Equation 6]

[0090] PosTh = AvgValue + Threshold

[0091] [Equation 7]

[0092] NegTh = AvgValue - Threshold

[0093] Here, PosTh refers to the first threshold, and NegTh refers to the second threshold.

[0094] The control circuit 270 can use threshold values ​​to determine the touch or proximity or recognition signal value of the active pen. The control circuit 270 can use a first threshold and a second threshold.

[0095] Figure 3 This is a graph showing the suspended active pen and the sum value based on the threshold according to an embodiment.

[0096] refer to Figure 3 When hovering, the active pen 10 can maintain a predetermined distance from the panel 110 without contacting it. Even when the active pen 10 is hovering, it can still transmit a downlink signal to the touch sensing device via the touch electrode TE. The touch sensing device can calculate a new threshold to detect weak downlink signals from the hovering active pen 10 and use the new threshold as a reference to determine whether the active pen 10 is touching or near.

[0097] To calculate a new threshold, the touch sensing device can use a sum of values ​​from a touch area. A touch area may include multiple touch electrodes TE, and the sum may be obtained by adding some or all of the sensed values ​​from the touch electrodes TE.

[0098] For example, multiple touch electrodes TE can be arranged in a 3x3 matrix to form a touch area A. Here, the touch sensing device can select 8 out of 9 sensing values ​​from the 9 touch electrodes TE, and calculate the sum of the 8 selected sensing values ​​to determine the total value of touch area A. The touch sensing device can also calculate the total value of other touch areas in panel 110 besides touch area A.

[0099] Figure 4 This is an example illustrating the process by which a touch sensing device calculates a sum and a threshold.

[0100] Figure 4 An example is shown where a touch sensing device calculates a threshold based on an arbitrary sum. The sum of multiple signal intervals in a touch area can be represented by the values ​​in Tables 1 to 4 (410 to 440).

[0101] For example, a frame may include a total of 40 (=8x5) signal intervals, and Table 1 410 may show the sum values ​​in these signal intervals. The sum values ​​may include positive sum values ​​as positive values ​​and negative sum values ​​as negative values.

[0102] Table 2 420 shows alternative values ​​for the sum based on the characteristics of the sum. For example, when the sum is equal to or less than a negative threshold, 1 can be used to replace the sum; when the sum is equal to or greater than a positive threshold, 0 can be used to replace the sum; and when the sum is a value that does not correspond to any of the aforementioned cases, 2 can be used to replace the sum.

[0103] Table 3,430 may simply show the selected sum values ​​used to calculate the average. Here, the selected sum values ​​may include fixed or predictable values. The sum value of sensed values ​​in a specific signal interval may be fixed. Where sensed values ​​forming a pair in two different signal intervals are complementary, the individual sum values ​​may be predictable. Pairs in Table 3,430 that each have the same pattern may represent signal intervals with complementary sum values.

[0104] Table 4,440 can show the deviation calculated based on the selected sum value in the portions corresponding to the respective signal intervals having the selected sum value. The deviation can be calculated in the signal intervals with fixed or predictable sum values ​​in Table 3,430.

[0105] The touch sensing device can calculate the threshold based on Tables 1 to 4 (410 to 440) as follows.

[0106] The touch sensing device can select a fixed or predictable sum value (as shown in Table 3 430) and average the selected sum value. The touch sensing device can obtain -9 (=(26+20-41-43+25-40+33-53) / 8) as the average value (AvgValue).

[0107] The touch sensing device can calculate the deviation of each touch area (as shown in Table 4,440). The touch sensing device can obtain 35 (=26-(-9)), 29 (=20-(-9)), -32 (=-41-(-9)), -34 (=-43-(-9)), 34 (=25-(-9)), -31 (=-40-(-9)), 42 (=33-(-9)) and -44 (=-53-(-9)) as deviations (StdValue).

[0108] The touch sensing device can calculate the threshold using the average of the absolute values ​​of the positive and negative deviations. The touch sensing device can obtain 140 (=35+29+34+42) as the sum of the positive deviations (PosSum), and -141 (=-32-34-31-44) as the sum of the negative deviations (NegSum), and obtain 17 (=(140-(-141)) / 16) as the threshold.

[0109] The touch sensing device can use threshold calculation to determine a first threshold (PosTh) with a positive value and a second threshold (NegTh) with a negative value. The touch sensing device can obtain 8 (=-9+17) as the first threshold and -26 (=-9-17) as the second threshold.

[0110] Figure 5 This is a flowchart illustrating the calculation of the threshold used by the touch sensing device to sense the hovering active pen.

[0111] refer to Figure 5 The sensing circuit of the touch sensing device can output a sensing value including information from the active pen (S502). The sensing value can vary depending on the strength of the downlink signal of the active pen. Here, the sensing value can be generated when the active pen is hovering.

[0112] The summing circuit of the touch sensing device can receive multiple sensing values ​​from multiple touch electrodes included in a touch area, and calculate a sum value of a touch area by summing the multiple sensing values ​​(S504). Since the sensing values ​​can be positive or negative, the sum value depends on whether the sensing values ​​can be positive or negative.

[0113] The average value calculation circuit of the touch sensing device can obtain multiple sum values ​​of multiple signal intervals and calculate the average value by averaging the multiple sum values ​​(S506). The average value calculation circuit can use all positive and negative sum values ​​to obtain the average value. The average value calculation circuit can use the same number of positive and negative sum values. The sum value used to calculate the average value can be fixed or predictable.

[0114] The deviation calculation circuit of the touch sensing device can calculate the deviation between each sum and the average value. The deviation calculation circuit can obtain positive deviations with positive values ​​and negative deviations with negative values.

[0115] The threshold calculation circuit of the touch sensing device can calculate the threshold using deviations (S510). The threshold calculation circuit can obtain the threshold by averaging the sum of the absolute values ​​of positive deviations and the sum of the absolute values ​​of negative deviations. Alternatively, the threshold calculation circuit can calculate a first threshold by adding the average value to the threshold value, and calculate a second threshold by subtracting the threshold value from the average value.

[0116] The control circuitry of the touch sensing device can receive at least one threshold and compare the at least one threshold with the sensing value of the active pen to determine the touch or proximity of the active pen. The control circuitry can use a first threshold for positive sensing values ​​and a second threshold for negative sensing values.

[0117] Cross-reference to related applications

[0118] This application claims priority to Korean Patent Application No. 10-2020-0018486, filed on February 14, 2020, the entire contents of which are incorporated herein by reference.

Claims

1. A touch sensing device for receiving information from an active pen, the touch sensing device comprising: A sensing circuit is used to output the sensing values ​​of each touch electrode in response to the downlink signal of the active pen; A summing circuit is used to calculate a sum by summing multiple sensed values; An average value calculation circuit is used to calculate the average value by averaging multiple sums calculated in different signal intervals. A deviation calculation circuit is used to calculate the deviation between the plurality of sums and the average value; A threshold calculation circuit for calculating at least one threshold using the deviation and the average value; as well as The control circuitry is configured to identify the values ​​of the downlink signal in each signal interval by comparing each summed value with the at least one threshold, and to identify information about the active pen using the signal values ​​in multiple signal intervals. The average value calculation circuit uses the sum of values ​​in a signal interval with a predictable signal value to calculate the average value, and the predictable signal value corresponds to a sensed value that is complementary to each other in two different signal intervals.

2. The touch sensing device according to claim 1, wherein, The sensing circuit outputs the sensed value when the active pen is suspended.

3. The touch sensing device according to claim 1, wherein, The at least one threshold includes a first threshold as a positive value and a second threshold as a negative value.

4. The touch sensing device according to claim 3, wherein, The threshold calculation circuit uses the average of the absolute values ​​of the deviations to calculate the threshold deviation value, and calculates the first threshold by summing the average value and the threshold deviation value.

5. The touch sensing device according to claim 3, wherein, The threshold calculation circuit uses the average of the absolute values ​​of the deviations to calculate the threshold deviation value, and calculates the second threshold by obtaining the difference between the average value and the threshold deviation value.

6. The touch sensing device according to claim 1, wherein, The deviation includes a positive deviation with a positive value and a negative deviation with a negative value, and the threshold calculation circuit calculates the at least one threshold by averaging the absolute values ​​of the positive deviation and the negative deviation.

7. The touch sensing device according to claim 1, wherein, The sum includes a positive sum as a positive value and a negative sum as a negative value, and the average value calculation circuit calculates the average value by averaging the same number of positive sums and negative sums.

8. A touch sensing system, comprising: The panel has touch electrodes arranged on it; An active pen for touching or approaching the panel; as well as A touch sensing device is configured to output a sensed value of the downlink signal of the touch electrode in response to the active pen, and to use the sensed value and at least one threshold to identify the value of the downlink signal. The touch sensing device calculates a sum by summing multiple sensed values, and compares the sum with the at least one threshold to identify the value of the downlink signal. The touch sensing device calculates an average value by averaging multiple sums, calculates the deviation between the sums and the average value, and calculates at least one threshold value based on the average of the deviations. The touch sensing device calculates the average value using the sum of values ​​in a signal interval with predictable signal values, and the predictable signal values ​​correspond to sensing values ​​that are complementary to each other in two different signal intervals.

9. The touch sensing system according to claim 8, wherein, The at least one threshold includes a first threshold as a positive value and a second threshold as a negative value.

10. The touch sensing system according to claim 8, wherein, The active pen hovers above the panel.

11. The touch sensing system according to claim 8, wherein, The touch electrodes are arranged in a matrix to form multiple touch areas.

12. The touch sensing system according to claim 8, wherein, The multiple sum values ​​are obtained in different signal intervals.

13. The touch sensing system according to claim 8, wherein, The touch sensing device calculates the sum by summing the sensing values ​​of N adjacent touch electrodes, where N is a natural number of 2 or greater.

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