Touch input device

Abstract

An input device according to an embodiment of the present invention includes: a touch sensor including a plurality of driving electrodes and a plurality of receiving electrodes; and a control unit that applies a driving signal corresponding to a plurality of driving codes to a selected driving electrode among the plurality of driving electrodes and determines a touch position based on sensing signals received from the plurality of receiving electrodes.

Description

Technical Field

[0001] Embodiments of the present invention relate to touch input devices, and more specifically, to touch input devices capable of improving flickering on the display screen due to multiple drives of touch sensors and changes in touch data as the display screen changes. Background Technology

[0002] Various types of input devices are used to operate computing systems. These include buttons, keys, joysticks, and touchscreens. Touchscreens are increasingly used in operating computing systems due to their ease of use.

[0003] A touch sensor is an information input device that can be installed on a display panel. For example, a touch sensor can be attached to one side of the display panel or integrated into the display panel. Users can input information by touching the touch sensor while looking at an image displayed on the screen of the display panel.

[0004] Figure 1 Figures (a) and (b) are used to illustrate the structure of existing touch sensors and multi-drive methods.

[0005] Reference Figure 1 (a) The existing touch sensor consists of multiple driving electrodes X0, X1, X2, X3, X4, X5, X6, X7 arranged along a first axis and multiple receiving electrodes Y0, Y1, Y2, Y3, Y4 arranged along a second axis.

[0006] In a typical touch sensing method for such a touch sensor, a high-voltage drive signal is applied to multiple drive electrodes X0, X1, X2, X3, X4, X5, X6, X7, and a touch signal generated by the drive signal is sensed through multiple receiving electrodes Y0, Y1, Y2, Y3, Y4.

[0007] The multi-drive method using the aforementioned touch sensor is one approach to achieve high sensitivity by applying drive signals to multiple drive electrodes X0, X1, X2, X3, X4, X5, X6, and X7. Figure 1 The left side of (b) shows a multi-drive mode where four-channel multiple codes are simultaneously applied to four drive electrodes selected from multiple drive electrodes to generate predetermined drive signals.

[0008] Figure 1The table shown on the left side of (b) is an example of a four-channel multicode for four drive signals X1, X2, X3, and X4 simultaneously input to four selected drive electrodes. Each drive signal can include a digital pulse signal represented by any of the codes 1 and -1, within predetermined time periods T1, T2, T3, and T4. Here, the pulse signal represented by code -1 can be a signal whose phase is reversed by 180 degrees from the pulse signal represented by code 1.

[0009] The four-channel multi-code uses multiple rows and columns to represent the first driving signal X1 to the fourth driving signal X4. The first driving signal X1 is a pulse signal represented by the codes -1, 1, 1, 1 in sequence. The second driving signal X2 is a pulse signal represented by the codes 1, -1, 1, 1 in sequence. The third driving signal X3 is a pulse signal represented by the codes 1, 1, -1, 1 in sequence. The fourth driving signal X4 is a pulse signal represented by the codes 1, 1, 1, -1 in sequence.

[0010] Figure 1 The table shown in the middle of (b) is an example of a demodulation code used to demodulate touch signals (sensing signals) received through multiple receiving electrodes Y0, Y1, Y2, Y3, Y4.

[0011] Figure 1 The table shown on the right side of (b) is the data code output after the touch signal is demodulated.

[0012] This Figure 1 The touch sensors and their multi-drive methods shown in (a) to (b) can improve touch sensitivity to some extent, but may cause concentration problems when applied to thin flexible display devices. See below for reference. Figures 2 to 4 Please provide an explanation.

[0013] Figure 2 It is used for explanation Figure 1 The circuit diagrams shown in (a) to (b) illustrate a potential problem in existing touch sensors and their multi-drive methods.

[0014] Reference Figure 2 When a pulsed touch drive signal is applied to the drive electrode TX of the touch sensor, a parasitic capacitance Cs is formed between the touch sensor and the ELVSS layer 20 of the display panel. In this case, the touch drive signal can generate an unwanted voltage signal Sc in the ELVSS layer 20 through the parasitic capacitance Cs.

[0015] In particular, to improve touch sensing sensitivity, when in Figure 1In the multi-drive scenario described in (a) to (b), a voltage change caused by the voltage signal Sc can occur in the ELVSS layer 20 in proportion to the sum of the code symbols driven in any concurrent time period T1, T2, T3, and T4 (here, "2"). This voltage change in the ELVSS layer 20 can 1) cause flicker on the display screen, and 2) affect touch data as the display screen changes, potentially causing errors or noise. In particular, to improve sensitivity... Figure 1 When the multi-code shown in (b) is extended to more than five channels, the sum of the above code symbols is greater than 2, which may cause greater noise or errors.

[0016] The following details the problems 1) and 2) caused by voltage changes in the ELVSS layer 20 mentioned above.

[0017] Figure 3 It is used to explain in Figure 1 Figures (a) to (b) illustrate possible flickering issues that may occur in existing touch sensors and their multi-drive methods.

[0018] Reference Figure 3 When a touch drive signal is applied to the drive electrode TX of the touch sensor located on the display panel, it may cause errors in the display pixel data, resulting in distortion on the displayed screen. Previously, to mitigate this distortion, complex driving methods were used to match synchronization, making the distortion imperceptible to the user, but this did not address the root cause of the problem. In particular, further extending the multi-code to improve touch sensitivity, thus increasing the sum of code symbols, may cause even greater errors (or noise).

[0019] Figure 4 It is used to explain in Figure 1 Figures (a) to (b) show the possible changes in touch data in existing touch sensors and their multi-drive methods, depending on changes in the display screen.

[0020] Reference Figure 4When the displayed image changes from the first image 41 to the second image 42, the touch data may be affected, causing errors. Specifically, when the display image and brightness change together, the pixel capacitive changes according to the pixel diode current, so it may appear as if the overall capacitance cap of the ELVSS layer 20 changes with the image. Therefore, the voltage applied to the ELVSS layer 20 due to the touch drive signal changes according to the display image and brightness. This voltage change is then transmitted to the receiving electrode RX via Cs, causing touch errors (noise). Furthermore, if the multi-code is extended to improve touch sensitivity, thus increasing the sum of the code symbols, it may cause even greater errors (or noise). Summary of the Invention

[0021] Technical problems to be solved

[0022] The technical problem to be solved by the present invention is to provide a touch input device that can alleviate or prevent flickering in the display screen caused by touch driving signals.

[0023] In addition, a touch input device is provided that can mitigate or prevent changes in touch data based on changes in the displayed screen.

[0024] In addition, a touch input device is provided that can improve the distortion of touch data in LGM (Low Mass Ground) state.

[0025] Technical solution

[0026] A touch input device according to an embodiment of the present invention includes: a touch sensor including a plurality of driving electrodes and a plurality of receiving electrodes; a control unit that applies a driving signal corresponding to a plurality of driving codes to a selected driving electrode among the plurality of driving electrodes, determines a touch position based on sensing signals received from the plurality of receiving electrodes, wherein the plurality of driving codes divides the driving signals into a plurality of time periods and represents each time period using either code "1" or code "-1", the sum of the codes of the driving signals in the plurality of driving codes is "0" in the plurality of driving codes, and the plurality of driving codes satisfies a first condition and a second condition, wherein the first condition is that the sum of the codes of a pair of driving signals applied to a pair of driving electrodes among the selected driving electrodes is "0" in each of the time periods; the second condition is that a pair of driving electrodes satisfying the first condition in the first half of the entire driving time of the plurality of time periods is different from a pair of driving electrodes satisfying the first condition in the second half of the entire driving time.

[0027] According to another embodiment of the present invention, a touch control module is a control module for controlling a touch sensor of a touch input device including multiple driving electrodes and multiple receiving electrodes, comprising: a driving unit for applying a driving signal corresponding to multiple driving codes to a selected driving electrode among the multiple driving electrodes; a sensing unit for receiving a receiving signal from the multiple receiving electrodes; and a control unit for determining a touch position based on the sensing signal, wherein the multiple driving codes are obtained by dividing the driving signal into multiple time periods and representing each time period with either code "1" or code "-1", the sum of the codes of the driving signals in the multiple driving codes is "0" in each time period, and the multiple driving codes satisfy a first condition and a second condition, wherein the first condition is that the sum of the codes of a pair of driving signals applied to a pair of driving electrodes among the selected driving electrodes is "0" in each of the time periods; and the second condition is that a pair of driving electrodes satisfying the first condition in the first half of the entire driving time of the multiple time periods is different from a pair of driving electrodes satisfying the first condition in the second half of the entire driving time.

[0028] The effects of the invention

[0029] When using a touch input device according to an embodiment of the present invention, it has the advantage of being able to improve display distortion by preventing flickering in the display screen caused by touch drive signals.

[0030] In addition, it has the advantage of improving touch sensitivity by mitigating or preventing changes in touch data based on changes in the displayed image.

[0031] In addition, it has the advantage of improving touch malfunctions and increasing touch sensitivity by reducing the distortion of touch data in LGM (Low Mass Ground) state. Attached Figure Description

[0032] Figure 1 Figures (a) and (b) are used to illustrate the structure of existing touch sensors and multi-drive methods.

[0033] Figure 2 It is used for explanation Figure 1 The circuit diagrams shown in (a) to (b) illustrate a potential problem in existing touch sensors and their multi-drive methods.

[0034] Figure 3 It is used to explain in Figure 1 Figures (a) to (b) illustrate possible flickering issues that may occur in existing touch sensors and their multi-drive methods.

[0035] Figure 4 It is used to explain in Figure 1Figures (a) to (b) show the possible changes in touch data in existing touch sensors and their multi-drive methods, depending on changes in the display screen.

[0036] Figure 5 This is a schematic block diagram of a touch input device according to one embodiment of the present invention.

[0037] Figure 6 Figures (a) to (c) are examples illustrating multi-drive code, demodulation code, and output data according to an embodiment of the present invention.

[0038] Figure 7 This shows the multi-driver code used when there are existing multi-drivers.

[0039] Figure 8 It is used for detailed explanation Figure 6 (a) shows a diagram of multi-drive code according to an embodiment of the present invention.

[0040] Figure 9 (a) is a diagram used to illustrate existing multi-drive methods. Figure 9 (b) is a diagram illustrating a multi-drive mode according to an embodiment of the present invention.

[0041] Figure 10 Figures (a) and (b) are used to illustrate the technical effects of a touch input device according to an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures

[0043] 100, 100', 100'': Touch sensor

[0044] 300: Control Department Detailed Implementation

[0045] The detailed description of the invention described below refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. These embodiments are described in detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the invention differ from one another, but are not necessarily mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in relation to one embodiment without departing from the spirit and scope of the invention in another embodiment. Furthermore, it should be understood that the position or arrangement of individual components in the various disclosed embodiments may be changed without departing from the spirit and scope of the invention. Therefore, the detailed description following is not intended to be limiting, and the scope of the invention, if properly described, is limited only to all scopes equivalent to those claimed in the claims and the appended claims. Similar reference numerals in the figures denote the same or similar functions in several respects.

[0046] The input device according to various embodiments of this specification, as an electronic device, may include at least one of, for example, a smartphone, tablet computer, in-vehicle display device, mobile phone, video phone, e-book reader, laptop computer, netbook computer, mobile medical device, camera, or wearable device. Here, wearable device may include at least one of the following: jewelry type (e.g., watch, ring, bracelet, anklet, necklace, glasses, contact lens, or head-mounted device; HMD)), fabric or clothing integrated type (e.g., electronic clothing), body-attached type (e.g., skin pad or tattoo) or bio-implantable type (e.g., implantable circuit).

[0047] Figure 5 This is a schematic block diagram of a touch input device according to one embodiment of the present invention.

[0048] Reference Figure 5 According to one embodiment of the present invention, a touch input device includes a touch sensor 100 and a control unit 300.

[0049] The touch sensor 100 includes a plurality of electrodes (or a plurality of sensors) of a predetermined shape, and the predetermined electrodes include a plurality of driving electrodes Tx0 to Tx7 and a plurality of receiving electrodes Rx0 to Rx7.

[0050] Multiple driving electrodes Tx0 to Tx7 and multiple receiving electrodes Rx0 to Rx7 can be arranged to cross each other. A predetermined mutual capacitance can be formed between the multiple driving electrodes Tx0 to Tx7 and the multiple receiving electrodes Rx0 to Rx7, that is, at their intersections.

[0051] Each driving electrode Tx0 to Tx7 can be arranged along a first axis, and each receiving electrode Rx0 to Rx7 can be arranged along a second axis, different from the first axis. Here, the second axis can be perpendicular to the first axis. Alternatively, the first axis can be named the major axis, and the second axis can be named the minor axis. Figure 5 The figure shows that the first axis direction is longer than the second axis direction, but it is not limited to this. Unlike the figure, the second axis direction can be formed to be longer than the first axis direction.

[0052] The control unit 300 controls the touch sensor 100.

[0053] The control unit 300 can simultaneously apply predetermined drive signals to selected drive electrodes from the plurality of drive electrodes Tx0 to Tx7 of the touch sensor 100. The selected drive electrodes can be eight or more. For example, the eight drive signals X1, X2, X3, X4, X5, X6, X7, and X8 applied to the eight selected drive electrodes can be as follows: Figure 6 (a) is represented by multi-drive code.

[0054] Figure 6 The multi-drive code shown in (a) represents eight drive signals X1, X2, X3, X4, X5, X6, X7, X8 applied to eight selected drive electrodes in eight time periods T1, T2, T3, T4, T5, T6, T7, T8 using either code "1" or code "-1". Each code can be a predetermined pulse signal, and the pulse signal represented by code "-1" can be a signal whose phase is reversed by 180 degrees from the pulse signal represented by 1.

[0055] The control unit 300 can generate the drive signal corresponding to the multiple drive codes and apply it to the selected drive electrode.

[0056] The characteristic of this multi-drive code is that the sum of the code values ​​(sum) of the eight drive signals X1, X2, X3, X4, X5, X6, X7, and X8 for each time period T1, T2, T3, T4, T5, T6, T7, and T8 is always "0".

[0057] on the contrary, Figure 7 In the case of the multi-drive code used in conventional multi-drive operations, four drive signals X1, X2, X3, and X4 are applied to the four selected drive electrodes. Specifically, in the existing multi-drive method, four drive signals are first applied to the four selected drive electrodes during the first to fourth time periods T1, T2, T3, and T4, and then the same drive signals are applied to the other four drive electrodes during the fifth to eighth time periods T5, T6, T7, and T8. According to this existing multi-drive method using multi-drive codes, the sum of the code values ​​(sum) of drive signals X1, X2, X3, X4, X5, X6, X7, and X8 is always "2" for each time period T1, T2, T3, T4, T5, T6, T7, and T8. As described above, the multi-drive code used in conventional multi-drive operations and Figure 6 The multi-drive code shown in (a) is different.

[0058] Reference Figure 8 Detailed description Figure 6 The multi-drive code shown in (a).

[0059] In order to set the total code value (sum) of each time period T1, T2, T3, T4, T5, T6, T7, T8 to "0", the multi-drive code has a first condition that the total code value of a pair of drive signals (e.g., X1 and X2) applied to a pair of drive electrodes is "0" in each time period (T1 to T8).

[0060] Here, if, in any of the time periods (T1 to T8), the code of the first drive signal (e.g., X1) in the pair of drive signals (e.g., X1 and X2) is "1" and the code of the second drive signal (e.g., X2) is "-1", then the code symbol is defined as "1". Conversely, if the code of the first drive signal (e.g., X1) is "-1" and the code of the second drive signal (e.g., X2) is "1", then the code symbol is defined as "-1". In this case, the multi-drive code can be represented as follows: Figure 8 As shown at the bottom.

[0061] In addition, the multi-drive code has a second condition that, during the entire drive time when all the drive signals are applied to the selected drive electrodes, the pair of drive electrodes to which a pair of drive signals satisfying the first condition are applied in the first half of the time and the pair of drive electrodes to which a pair of drive signals satisfying the first condition are applied in the second half of the time are different.

[0062] For example, suppose the first drive signal X1 is directed towards... Figure 5 The 0th driving electrode Tx0, the second driving signal X2 to Figure 5 The first driving electrode Tx1, the third driving signal X3 to Figure 5 The second driving electrode Tx2, the fourth driving signal X4 to Figure 5 The third driving electrode Tx3, the fifth driving signal X5 to Figure 5 The fourth driving electrode Tx4, the sixth driving signal X6 to Figure 5 The fifth driving electrode Tx5, the seventh driving signal X7 to Figure 5 The sixth driving electrode Tx6, the eighth driving signal X8 to Figure 5 When the seventh driving electrode Tx7 is applied simultaneously, the pair of driving electrodes (Tx0 and Tx1, or Tx2 and Tx3, or Tx4 and Tx5, or Tx6 and Tx7) that are applied to the pair of driving signals (X1 and X2, or X3 and X4, or X5 and X6, or X7 and X8) in the first half of the time (T1 to T4) and the pair of driving electrodes (Tx1 and Tx2, or Tx3 and Tx4, or Tx5 and Tx6, or Tx7 and Tx0) that are applied to the pair of driving signals (X2 and X3, or X4 and X5, or X6 and X7, or X8 and X1) in the second half of the time (T5 to T8) are different.

[0063] Under the aforementioned assumption, any one of the driving electrodes Tx1 in a pair of driving electrodes (e.g., Tx0 and Tx1) that satisfies the first condition during the first half of the time (T1 to T4) can be the same as any one of the driving electrodes Tx1 in a pair of driving electrodes (e.g., Tx1 and Tx2) that satisfies the first condition during the second half of the time (T5 to T8).

[0064] Furthermore, for a drive signal (e.g., X2) applied to any one of the multiple drive electrodes Tx0 to Tx7 (e.g., Tx1), the sum of the codes of the drive signal (e.g., X2) applied to another drive electrode (e.g., Tx0) may be "0" in the first half of the time (T1 to T4), and the sum of the codes of the drive signal (e.g., X1) applied to yet another drive electrode (e.g., Tx2) may be "0". Here, any one drive electrode (e.g., Tx1) may be located between the other drive electrode (e.g., Tx0) and the yet another drive electrode (e.g., Tx2).

[0065] Refer to Figure 5 The control unit 300 receives sensing signals from multiple receiving electrodes (Rx0 to Rx7 electrodes) of the touch sensor 100. The sensing signals may include information on the capacitance change between the corresponding receiving electrode and its adjacent driving electrode, LGM noise signals, and display noise signals, etc.

[0066] The control unit 300 can output a digital sensing signal by converting the sensing signals output from multiple receiving electrodes (Rx0 to Rx7 electrodes) from analog to digital. This control unit 300 can detect whether a touch is made and / or the touch location based on the output digital signal.

[0067] The control unit 300 can output a differential signal by differentially amplifying two of the sensing signals from multiple receiving electrodes (Rx0 to Rx7 electrodes), and can perform analog-to-digital conversion on the output signal. For this purpose, the control unit 300 may include a comparator and an ADC. This control unit 300 can detect whether a touch has occurred and / or the touch location based on the output digital signal.

[0068] The control unit 300 can demodulate sensing signals output from multiple receiving electrodes (Rx0 to Rx7 electrodes). To demodulate the sensing signals, the control unit 300 may include a demodulation unit (not shown). The demodulation unit (not shown) can decode the input sensing signals using pre-stored demodulation codes to output touch data. For example, in... Figure 6 (b) shows an example of the demodulation code, in Figure 6 (c) shows an example of the touch data.

[0069] Figure 9 (a) is a diagram used to illustrate existing multi-drive methods. Figure 9 (b) is a diagram illustrating a multi-drive method according to an embodiment of the present invention.

[0070] Reference Figure 9 In (a), in existing multi-drive methods, a drive signal X0 corresponding to a predetermined drive code is applied to each drive electrode, and a sensing signal Y0 is output through each receiving electrode. Figure 5 In the control unit 300 shown, the touch position is determined based on a single data point (data) of the capacitance change with respect to C1 detected by the sensing signal Y0.

[0071] Reference Figure 9 (b) According to an embodiment of the present invention, the multi-drive method is a method of simultaneously applying a pair of drive signals X0, X1 to a pair of drive electrodes. Here, the pair of drive signals X0, X1 has the characteristic that the sum of the drive codes is 0 over a time period. A predetermined sensing signal Y0 is output through each receiving electrode, the sensing signal Y0 containing differential data based on the pair of drive electrodes. Figure 5 The control unit 300 shown can recover the differential data into a single data point through a predetermined signal processing procedure (e.g., integration and sign processing). The touch position can be determined based on the recovered single data point.

[0072] Refer to Figure 5 The control unit 300 can be implemented as a touch control module, a touch control unit, or a touch control chip. However, it is not limited to this. The control unit 300 may also include: a sensing unit that receives sensing signals from the receiving electrodes of the touch sensor 100; a driving unit that applies driving signals to the driving electrodes of the touch sensor 100; a demodulation unit that demodulates the received sensing signals; and a control unit that controls the sensing unit and the driving unit. Alternatively, at least two of the sensing unit, driving unit, demodulation unit, and control unit may be implemented as a single module, unit, or chip.

[0073] The touch input device may include a display panel (not shown). The touch sensor 100 may be disposed on a cell of the display panel, or it may be disposed within a cell of the display panel in an in-cell manner. In some cases, the touch sensor 100 may also be disposed below the display panel. As an example, the touch sensor 100 may be directly formed on the outer surface (e.g., the upper surface of the upper substrate or the lower surface of the lower substrate) or the inner surface (e.g., the lower surface of the upper substrate or the upper surface of the lower substrate) of the upper substrate and / or lower substrate of the display panel. The touch sensor 100 can be integrated into the display panel to constitute a touch screen panel (TSP).

[0074] The display panel can be a flexible display panel or a rigid display panel.

[0075] The display panel can have multiple scan lines (or gate lines) and multiple data lines. Subpixels can be located in the area where the scan lines and data lines intersect.

[0076] For driving the display panel, the touch input device may include a gate driving circuit, a data driving circuit, and a display control unit for driving various signal lines disposed on the display panel.

[0077] The gate driving circuit is controlled by the display control unit, and can control the driving timing of multiple sub-pixels by sequentially outputting display scan signals to multiple scan lines disposed on the display panel.

[0078] The data driving circuit can receive image data from the display control unit and convert the image data into analog data voltage. The data driving circuit can control the brightness of each sub-pixel according to the image data by outputting the data voltage (Vdata) to each data line according to the timing of the scan signal applied through the scan line.

[0079] The display control unit can provide various control signals to the gate driving circuit and the data driving circuit to control their operation. The display control unit can interact with... Figure 5 The control unit 300 shown can be configured separately or as a single unit.

[0080] Figure 10 Figures (a) and (b) are used to illustrate the technical effects of a touch input device according to an embodiment of the present invention. Figure 10 (a) is a diagram illustrating the voltage changes that occur in the ELVSS layer 20 of the display panel using existing multi-drive methods. Figure 10(b) is a diagram illustrating how the multi-drive method according to an embodiment of the present invention minimizes voltage variations in the ELVSS layer 20 of the display panel.

[0081] Reference Figure 10 (a), previously passed Figures 2 to 4 The problems with the existing multi-drive method, namely 1) flickering in the display screen and 2) changes in touch data depending on the display screen and brightness, are mainly due to the fact that when predetermined touch drive signals are simultaneously applied to multiple selected drive electrodes TX during multi-drive operation, a voltage signal Sc is generated in the ELVSS layer 20 of the display panel. In particular, when the sum of the codes of the touch drive signals is "2" or more, the voltage change of the voltage signal Sc will be greater.

[0082] However, refer to Figure 10 (b) In the multi-drive method according to an embodiment of the present invention, since the sum of the codes of each time period of the drive signals applied to the multiple drive electrodes Tx of the multi-drive is always "0", the amount of voltage signal Sc'' generated in the ELVSS layer 20 is very small or almost non-existent. Therefore, the voltage variation of the voltage signal Sc'' in the ELVSS layer 20 can be minimized.

[0083] On the other hand, in the LGM (low ground mass) state, the drive signal applied to the drive electrode TX by the user's finger or other touch conductor can be output to the receiving electrode RX, which may cause touch data distortion. However, in the multi-drive method according to an embodiment of the present invention, since the sum of the codes of each time period of the drive signal applied to the drive electrode Tx of the multi-drive is always "0", the voltage signal Sc'' in the ELVSS layer 20 can be minimized even if the corresponding touch input device is in the LGM state.

[0084] Furthermore, in LGM state, the larger the touch area of ​​the touch conductor, the more severe the distortion. According to the multi-drive method of the present invention, the distortion of touch data output from the receiving electrode RX can be improved even when the touch area is large.

[0085] The features, structures, and effects described in the above embodiments are included in one embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, those skilled in the art can combine or modify the features, structures, and effects illustrated in each embodiment to implement other embodiments. Therefore, it should be interpreted that content related to such combinations and modifications is included within the scope of the present invention.

[0086] Furthermore, the above description focuses on embodiments, but these are merely examples and not intended to limit the invention. Those skilled in the art can make various modifications and applications not illustrated above without departing from the essential characteristics of these embodiments. For example, the constituent elements specifically shown in the embodiments can be modified. Moreover, differences related to these modifications and applications should be interpreted as including within the scope of the invention as defined in the appended claims.

Claims

1. A touch input device, comprising: A touch sensor, comprising multiple driving electrodes and multiple receiving electrodes; The control unit applies a drive signal corresponding to a multiple drive code to a selected drive electrode among the plurality of drive electrodes, and determines the touch position based on the sensing signals received from the plurality of receiving electrodes. The multi-drive code divides the drive signal into multiple time periods and represents each time period using either code "1" or code "-1". The total value of the drive signal codes, calculated according to the time period, is "0". The multi-driver code satisfies the first condition and the second condition, wherein... The first condition is that the total code value of a pair of drive signals applied to a pair of drive electrodes in the selected drive electrodes is "0" in each of the time periods; The second condition is that, during the entire driving time of the plurality of time periods, a pair of driving electrodes that satisfy the first condition in the first half of the time period and a pair of driving electrodes that satisfy the first condition in the second half of the time period are different from each other.

2. The touch input device according to claim 1, wherein, In the first half of the time, any one of the driving electrodes that satisfies the first condition is the same as any one of the driving electrodes that satisfies the first condition in the second half of the time.

3. The touch input device according to claim 1, wherein, The selected driving electrodes are eight in number. The multi-drive code has a first time period to an eighth time period.

4. The touch input device according to claim 3, wherein, When the selected driving electrodes are the 0th to the 7th driving electrodes arranged sequentially in one direction... The pair of driving electrodes that satisfy the first condition during the first half of the time period are the 0th driving electrode and the first driving electrode, the second driving electrode and the third driving electrode, the fourth driving electrode and the fifth driving electrode, and the sixth driving electrode and the seventh driving electrode. The pair of driving electrodes that satisfy the first condition in the latter half of the time is the first driving electrode and the second driving electrode, the third driving electrode and the fourth driving electrode, the fifth driving electrode and the sixth driving electrode, and the seventh driving electrode and the first driving electrode.

5. The touch input device according to claim 1, wherein, The control unit has demodulation code for demodulating the sensed signal.

6. The touch input device according to claim 1, wherein, It also includes a display panel; The touch sensor is located inside the display panel.

7. The touch input device according to claim 1, wherein, It also includes a display panel; The touch sensor is located above or below the display panel.

8. A touch control module, which is a control module for controlling a touch sensor of a touch input device including multiple driving electrodes and multiple receiving electrodes, comprising: The driving unit applies a driving signal corresponding to a multiple driving code to a selected driving electrode among the plurality of driving electrodes; The sensing unit receives received signals from the plurality of receiving electrodes; as well as The control unit determines the touch position based on the sensing signal. The multi-drive code divides the drive signal into multiple time periods and represents each time period using either code "1" or code "-1". The total value of the drive signal codes, calculated according to the time period, is "0". The multi-driver code satisfies the first condition and the second condition, wherein... The first condition is that the total code value of a pair of drive signals applied to a pair of drive electrodes in the selected drive electrodes is "0" in each of the time periods; The second condition is that, during the entire driving time of the plurality of time periods, a pair of driving electrodes that satisfy the first condition in the first half of the time period and a pair of driving electrodes that satisfy the first condition in the second half of the time period are different from each other.

9. The touch control module according to claim 8, wherein, Also includes: The demodulation unit has demodulation codes for demodulating the sensed signal.

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