Touch input device

Abstract

An input device according to an embodiment of the present invention comprises: a touch sensor including a plurality of driving electrodes and a plurality of receiving electrodes; and a control unit which applies driving signals corresponding to multi-driving code to driving electrodes selected from among the plurality of driving electrodes and determines a touch position on the basis of detection signals received from the plurality of receiving electrodes.

Description

touch input device

[0001] An embodiment of the present invention relates to a touch input device, and more specifically, to a touch input device capable of improving flickering on a display screen due to multi-operation of a touch sensor and changes in touch data according to changes in the display screen.

[0002] A variety of input devices are used to operate computing systems. Examples include buttons, keys, joysticks, and touchscreens. The ease and convenience of using touchscreens has led to an increase in their use in computing systems.

[0003] A touch sensor is a type of information input device that can be installed and used on a display panel. For example, the touch sensor can be attached to one side of the display panel or manufactured as an integral part of the display panel. A user can input information by touching the touch sensor while viewing an image displayed on the display panel.

[0004] Figures 1 (a) and (b) are drawings for explaining the structure of a conventional touch sensor and a multi-driving method.

[0005] Referring to (a) of Fig. 1, a conventional touch sensor is composed of a plurality of driving electrodes (X0, X1, X2, X3, X4, X5, X6, X7) arranged in a first-axis direction and a plurality of receiving electrodes (Y0, Y1, Y2, Y3, Y4) arranged in a second-axis direction.

[0006] A general touch sensing method of such a touch sensor is to apply a high voltage driving signal to a plurality of driving electrodes (X0, X1, X2, X3, X4, X5, X6, X7), and sense a touch signal generated by the driving signal through a plurality of receiving electrodes (Y0, Y1, Y2, Y3, Y4).

[0007] The multi-driving method using the above touch sensor is a multi-driving method that simultaneously applies predetermined driving signals to four driving electrodes selected from among a plurality of driving electrodes using the 4-channel multi (4-multiple) code shown on the left side of (b) of Fig. 1 when applying driving signals to multiple driving electrodes (X0, X1, X2, X3, X4, X5, X6, X7) in order to obtain high sensitivity.

[0008] The table shown on the left side of Fig. 1 (b) is an example of a 4-channel multi-code of 4 driving signals (X1, X2, X3, X4) that are simultaneously input to 4 selected driving electrodes. Each driving signal may include a digital pulse signal expressed by either a code of 1 or a code of -1 for a predetermined time interval (T1, T2, T3, T4). Here, the pulse signal expressed by the code of -1 may be a pulse signal expressed by shifting the phase of the pulse signal expressed by the code of 1 by 180 degrees.

[0009] The above 4-channel multi-code expresses the first driving signal (X1) to the fourth driving signal (X4) in multiple rows and columns, wherein the first driving signal (X1) is a pulse signal sequentially expressed by codes -1, 1, 1, 1, the second driving signal (X2) is a pulse signal sequentially expressed by codes 1, -1, 1, 1, the third driving signal (X3) is a pulse signal sequentially expressed by codes 1, 1, -1, 1, and the fourth driving signal (X4) is a pulse signal sequentially expressed by codes 1, 1, 1, -1.

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

[0011] The table shown on the right side of (b) of Fig. 1 is a data code output by decoding the demodulation code into the touch signal.

[0012] The touch sensor and its multi-driving method illustrated in (a) to (b) of FIG. 1 can improve touch sensitivity to some extent, but may cause several problems when applied to a thin flexible display device. This will be described below with reference to FIGS. 2 to 4.

[0013] FIG. 2 is a circuit diagram for explaining one problem that may occur in the conventional touch sensor and its multi-driving method illustrated in FIG. 1 (a) to (b).

[0014] Referring to FIG. 2, when a pulse-shaped touch driving signal is applied to the driving 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 driving signal may generate an unwanted voltage signal (Sc) in the ELVSS layer (20) through the parasitic capacitance (Cs).

[0015] In particular, in order to increase the touch sensing sensitivity, when driving multi-steps as described in (a) to (b) of FIG. 1, a voltage change may occur in the ELVSS layer (20) due to a voltage signal (Sc) in proportion to the size of the sum of the code symbols (here, '2') driven in any same time interval (T1, T2, T3, T4). The voltage change of the ELVSS layer (20) may 1) cause a flicker on the display screen, and 2) cause touch data to be affected by changes in the display screen, thereby causing errors or noise. In particular, when the multi-code illustrated in (b) of FIG. 1 is expanded to 5 channels or more in order to increase the sensitivity, the sum of the above-mentioned code symbols may be greater than 2, which may cause greater noise or errors.

[0016] The problems 1) and 2) due to the voltage change of the ELVSS layer (20) described above are described in detail below.

[0017] FIG. 3 is a drawing for explaining flicker induction that may occur in the conventional touch sensor and its multi-driving method illustrated in FIG. 1 (a) to (b).

[0018] Referring to Fig. 3, when a touch drive signal is applied to the drive electrode (TX) of a touch sensor disposed on a display panel, an error may be induced in the display pixel data, which may cause distortion on the display screen. In the past, in order to improve this distortion, a method of alleviating the distortion phenomenon so that it is not visible to the user by matching the sync and using a complex drive method has been avoided, but the fundamental problem has not been solved. In particular, if the sum of the code symbols is increased by further expanding the multi-code to improve the touch sensitivity, a larger error (or noise) may be induced.

[0019] FIG. 4 is a drawing for explaining changes in touch data according to changes in a display screen that may occur in a conventional touch sensor and its multi-driving method illustrated in FIG. 1 (a) to (b).

[0020] Referring to Fig. 4, when the display screen changes from the first screen (41) to the second screen (42), the touch data may be affected, which may cause an error. In particular, when the display screen and brightness change together, a change in pixel capacitance (pixel cap) may occur depending on the pixel diode current, and the overall capacitance (cap) of the ELVSS layer (20) may appear to change depending on the screen. As a result, the voltage applied to the ELVSS layer (20) due to the touch drive signal may change depending on the display screen and brightness. This voltage change is then transmitted to the receiving electrode (RX) through Cs, which may cause a touch error (noise). Here, if the multi-code is further expanded to improve the touch sensitivity and the sum of the code symbols becomes larger, a larger error (or noise) may be caused.

[0021] The problem to be solved by the present invention is to provide a touch input device that can alleviate or prevent flickering on a display screen caused by a touch driving signal.

[0022] In addition, a touch input device capable of alleviating or preventing changes in touch data due to changes in the display screen is provided.

[0023] In addition, a touch input device capable of improving distortion of touch data in a LGM (Low Mass Ground) state is provided.

[0024] According to an embodiment of the present invention, a touch input device includes: a touch sensor including a plurality of driving electrodes and a plurality of receiving electrodes; and a control unit that applies driving signals corresponding to a multi-driving code to driving electrodes selected from among the plurality of driving electrodes and determines a touch position based on detection signals received from the plurality of receiving electrodes; wherein the multi-driving code divides the driving signals into a plurality of time sections and is expressed by one of the codes '1' and '-1' for each time section, and the multi-driving code has a first condition that the code sum value of the driving signals for each time section is '0', and the multi-driving code has a first condition that the code sum value of a pair of driving signals applied to a pair of driving electrodes among the selected driving electrodes for each time section is '0', and a pair of driving electrodes that satisfies the first condition during a first half of the entire driving time of the plurality of time sections satisfies a second condition that is different from a pair of driving electrodes that satisfies the first condition during a second half of the entire driving time.

[0025] A touch control module according to another embodiment of the present invention is a control module for controlling a touch sensor of a touch input device including a plurality of driving electrodes and a plurality of receiving electrodes, the control module comprising: a driving unit for applying driving signals corresponding to a multi-driving code to driving electrodes selected from among the plurality of driving electrodes; a sensing unit for receiving receiving signals from the plurality of receiving electrodes; And a control unit for determining a touch position based on the detection signals; wherein the multi-driving code divides the driving signals into a plurality of time sections, and is expressed by one of codes '1' and '-1' for each time section, and the multi-driving code has a first condition that the code sum value of the driving signals for each time section is '0', and the multi-driving code has a first condition that the code sum value of a pair of driving signals applied to a pair of driving electrodes among the selected driving electrodes for each time section is '0', and a pair of driving electrodes that satisfies the first condition during the first half of the entire driving time of the plurality of time sections satisfies a second condition that is different from a pair of driving electrodes that satisfies the first condition during the second half.

[0026] Using a touch input device according to an embodiment of the present invention has the advantage of preventing flickering on a display screen caused by a touch drive signal, thereby improving display distortion.

[0027] Additionally, there is an advantage in that touch sensitivity can be improved by alleviating or preventing changes in touch data due to changes in the display screen.

[0028] Additionally, it has the advantage of improving touch malfunction and enhancing touch sensitivity by reducing distortion of touch data in the LGM (Low Mass Ground) state.

[0029] Figures 1 (a) and (b) are drawings for explaining the structure of a conventional touch sensor and a multi-driving method.

[0030] FIG. 2 is a circuit diagram for explaining one problem that may occur in the conventional touch sensor and its multi-driving method illustrated in FIG. 1 (a) to (b).

[0031] FIG. 3 is a drawing for explaining flicker induction that may occur in the conventional touch sensor and its multi-driving method illustrated in FIG. 1 (a) to (b).

[0032] FIG. 4 is a drawing for explaining changes in touch data according to changes in a display screen that may occur in a conventional touch sensor and its multi-driving method illustrated in FIG. 1 (a) to (b).

[0033] Figure 5 is a schematic block diagram of a touch input device according to one embodiment of the present invention.

[0034] FIGS. 6(a) to 6(c) are drawings for explaining examples of multi-drive codes, demodulation codes, and output data according to one embodiment of the present invention.

[0035] Figure 7 shows a multi-drive code used in conventional multi-drive.

[0036] FIG. 8 is a drawing for explaining in detail a multi-drive code according to one embodiment of the present invention illustrated in FIG. 6 (a).

[0037] Figure 9 (a) is a drawing for explaining a conventional multi-driving method, and Figure 9 (b) is a drawing for explaining a multi-driving method according to an embodiment of the present invention.

[0038] Figures 10 (a) and (b) are drawings for explaining the technical effects of a touch input device according to an embodiment of the present invention.

[0039] The following detailed description of the present invention refers to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention, while different from each other, are not necessarily mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention. Furthermore, it should be understood that the positions or arrangements of individual components within each disclosed embodiment may be modified without departing from the spirit and scope of the present invention. Accordingly, the following detailed description is not intended to be limiting, and the scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly described. Like reference numerals in the drawings designate the same or similar functions throughout the several aspects.

[0040] A touch input device according to various embodiments of the present document may include, as an electronic device, at least one of a smartphone, a tablet personal computer, a vehicle display device, a mobile phone, a video phone, an e-book reader, a laptop personal computer, a netbook computer, a mobile medical device, a camera, or a wearable device. Here, the wearable device may include at least one of an accessory type (e.g., a watch, a ring, a bracelet, an anklet, a necklace, glasses, a contact lens, or a head-mounted device (HMD)), a fabric or clothing-integrated type (e.g., an electronic garment), a body-attached type (e.g., a skin pad or a tattoo), or a bio-implantable type (e.g., an implantable circuit).

[0041] Figure 5 is a schematic block diagram of a touch input device according to one embodiment of the present invention.

[0042] Referring to FIG. 5, a touch input device according to one embodiment of the present invention includes a touch sensor (100) and a control unit (300).

[0043] 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).

[0044] A plurality of driving electrodes (Tx0 to Tx7) and a plurality of receiving electrodes (Rx0 to Rx7) can be arranged to intersect each other. A predetermined mutual capacitance can be formed between the plurality of driving electrodes (Tx0 to Tx7) and the plurality of receiving electrodes (Rx0 to Rx7), i.e., at their intersections.

[0045] Each driving electrode (Tx0 to Tx7) may be arranged in a first-axis direction, and each receiving electrode (Rx0 to Rx7) may be arranged in a second-axis direction different from the first-axis direction. Here, the second-axis direction may be a direction perpendicular to the first-axis direction. The first-axis direction may be referred to as a long-axis direction, and the second-axis direction may be referred to as a short-axis direction. In Fig. 5, the first-axis direction is illustrated as being longer than the second-axis direction, but this is not limited thereto, and unlike the drawing, the second-axis direction may be formed to be longer than the first-axis direction.

[0046] The control unit (300) controls the touch sensor (100).

[0047] The control unit (300) can simultaneously apply predetermined driving signals to selected driving electrodes among a plurality of driving electrodes (Tx0 to Tx7, 쪋) of the touch sensor (100). The number of selected driving electrodes may be eight or more. For example, eight driving signals (X1, X2, X3, X4, X5, X6, X7, X8) applied to the eight selected driving electrodes can be expressed as a multi-driving code as in (a) of FIG. 6.

[0048] The multi-driving code illustrated in (a) of Fig. 6 expresses eight driving signals (X1, X2, X3, X4, X5, X6, X7, X8) applied to eight selected driving electrodes as either code '1' or code '-1' for each of eight time intervals (T1, T2, T3, T4, T5, T6, T7, T8). Each code may be a predetermined pulse signal, and the pulse signal expressed as code '-1' may be the pulse signal expressed as 1 with its phase shifted by 180 degrees.

[0049] The control unit (300) can generate the driving signals corresponding to the multi-driving code and apply them to the selected driving electrodes.

[0050] This multi-drive code has a characteristic that the sum of the code values ​​of eight drive signals (X1, X2, X3, X4, X5, X6, X7, X8) for each time section (T1, T2, T3, T4, T5, T6, T7, T8) is all '0'.

[0051] On the other hand, the multi-driving code used in the conventional multi-driving illustrated in FIG. 7 is for applying four driving signals (X1, X2, X3, X4) to four selected driving electrodes. Specifically, the conventional multi-driving method applies four driving signals to the four selected driving electrodes first during the first to fourth time sections (T1, T2, T3, T4), and then applies the driving signals to the other four driving electrodes during the fifth to eighth time sections (T5, T6, T7, T8). According to the multi-driving method using the conventional multi-driving code, the sum of the code values ​​of the driving signals (X1, X2, X3, X4, X5, X6, X7, X8) for each time section (T1, T2, T3, T4, T5, T6, T7, T8) is all '2'. In this way, the multi-drive code used in conventional multi-drive is different from the multi-drive code shown in (a) of Fig. 6.

[0052] Referring to Fig. 8, the multi-drive code shown in Fig. 6 (a) will be described in detail.

[0053] In order for the sum code value (sum) for each time section (T1, T2, T3, T4, T5, T6, T7, T8) to be set to '0', the multi-driving code has a first condition that a pair of driving signals (e.g., X1 and X2) applied to a pair of driving electrodes have a code sum value of '0' for each time section (any one of T1 to T8).

[0054] Here, for each time interval (one of T1 to T8), if the code of the first driving signal (e.g., X1) among the pair of driving signals (e.g., X1 and X2) is '1' and the code of the second driving signal (e.g., X2) is '-1', the code sign is defined as '1', and conversely, if the code of the first driving signal (e.g., X1) is '-1' and the code of the second driving signal (e.g., X2) is '1', the code sign is defined as '-1', and the multi-driving code can be expressed as shown in the lower part of FIG. 8.

[0055] In addition, the multi-driving code has a second condition that is different from a second condition in that, during the entire driving time in which all of the driving signals are applied to the selected driving electrodes, a pair of driving electrodes to which a pair of driving signals satisfying the first condition is applied during the first half of the driving time.

[0056] For example, when it is assumed that the first driving signal (X1) is applied to the 0th driving electrode (Tx0) of FIG. 5, the second driving signal (X2) is applied to the 1st driving electrode (Tx1) of FIG. 5, the third driving signal (X3) is applied to the 2nd driving electrode (Tx2) of FIG. 5, the fourth driving signal (X4) is applied to the 3rd driving electrode (Tx3) of FIG. 5, the fifth driving signal (X5) is applied to the 4th driving electrode (Tx4) of FIG. 5, the sixth driving signal (X6) is applied to the 5th driving electrode (Tx5) of FIG. 5, the 7th driving signal (X7) is applied to the 6th driving electrode (Tx6) of FIG. 5, and the 8th driving signal (X8) is applied to the 7th driving electrode (Tx7) of FIG. 5, during the first half of the time (from T1 to T4), the pair of driving signals (X1 and X2, or X3 and X4, or X5 and A pair of driving electrodes (Tx0 and Tx1, or Tx2 and Tx3, or Tx4 and Tx5, or Tx6 and Tx7) to which a signal (X6, or X7 and X8) is applied is different from a pair of driving electrodes (Tx1 and Tx2, or Tx3 and Tx4, or Tx5 and Tx6, or Tx7 and Tx0) to which a signal (X2 and X3, or X4 and X5, or X6 and X7, or X8 and X1) is applied during the latter period (T5 to T8).

[0057] Under the above assumption, one of the driving electrodes (e.g., Tx0 and Tx1) that satisfies the first condition during the first half of the time period (T1 to T4) may be the same as one of the driving electrodes (e.g., Tx1 and Tx2) that satisfies the first condition during the second half of the time period (T5 to T8).

[0058] In addition, a driving signal (e.g., X2) applied to one driving electrode (e.g., Tx1) among a plurality of driving electrodes (Tx0 to Tx7) may have a code sum value of '0' with another driving signal (X1) applied to another driving electrode (e.g., Tx0) during the first half of the time (T1 to T4), and a code sum value of '0' with another driving signal (X3) applied to another driving electrode (e.g., Tx2) during the second half of the time (T5 to T8). Here, one of the driving electrodes (e.g., Tx1) may be disposed between the other driving electrode (e.g., Tx0) and the another driving electrode (e.g., Tx2).

[0059] Referring again to FIG. 5, the control unit (300) receives detection signals from a plurality of receiving electrodes (Rx0 to Rx7 electrodes) of the touch sensor (100). The detection signals may include information on the amount of capacitance change between the receiving electrode and the adjacent driving electrode, an LGM noise signal, a display noise signal, and the like.

[0060] The control unit (300) can convert detection signals output from a plurality of receiving electrodes (Rx0 to Rx7 electrodes) into analog-to-digital signals and output digital detection signals. The control unit (300) can detect whether a touch has occurred and / or the touch location based on the output digital signals.

[0061] The control unit (300) can differentially amplify two detection signals among the detection signals output from a plurality of receiving electrodes (Rx0 to Rx7 electrodes) to output a differential signal, and can convert the output signal into analog-to-digital and output it. To this end, the control unit (300) can include a comparator and an ADC. The control unit (300) can detect whether there is a touch and / or a touch location based on the output digital signal.

[0062] The control unit (300) can demodulate detection signals output from a plurality of receiving electrodes (electrodes Rx0 to Rx7). To demodulate the detection signals, the control unit (300) can include a demodulation unit (not shown). The demodulation unit (not shown) can decode the input detection signals using a pre-stored demodulation code and output touch data. For example, an example of the demodulation code is illustrated in (b) of FIG. 6, and an example of the touch data is illustrated in (c) of FIG. 6.

[0063] Figure 9 (a) is a drawing for explaining a conventional multi-driving method, and Figure 9 (b) is a drawing for explaining a multi-driving method according to an embodiment of the present invention.

[0064] Referring to (a) of Fig. 9, in the conventional multi-driving method, a driving signal (X0) corresponding to a predetermined driving code is applied to each driving electrode, and one detection signal (Y0) is output through each receiving electrode. The control unit (300) illustrated in Fig. 5 detects one data (single data) on the amount of change in electrostatic capacity of C1 based on the detection signal (Y0) to determine the touch position.

[0065] Referring to (b) of FIG. 9, a multi-driving method according to an embodiment of the present invention is a method of simultaneously applying a pair of driving signals (X0, X1) to a pair of driving electrodes. Here, the pair of driving signals (X0, X1) have a characteristic that the sum of the driving codes becomes 0 for each time section. A predetermined detection signal (Y0) is output through each receiving electrode, and the detection signal (Y0) includes differential data by the pair of driving electrodes. The control unit (300) illustrated in FIG. 5 can restore the differential data into a single data through a predetermined signal processing process (e.g., integration and sign processing). The touch position can be determined based on the restored single data.

[0066] Again, referring to FIG. 5, the control unit (300) may be implemented as a single touch control module, a touch control unit, or a touch control chip. However, the present invention is not limited thereto, and the control unit (300) may include a sensing unit that receives a sensing signal from a receiving electrode of the touch sensor (100), a driving unit that applies a driving signal to a driving electrode of the touch sensor (100), a demodulating unit that demodulates the received sensing signal, and a control unit that controls the sensing unit and the driving unit. Alternatively, at least two of the sensing unit, the driving unit, the demodulating unit, and the control unit may be implemented as a single module, unit, or chip.

[0067] The above 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 may be disposed within a cell of the display panel, such as in an in-cell manner. In some cases, the touch sensor (100) may be disposed under the display panel. For example, the touch sensor (100) may be formed directly on an outer surface (e.g., an upper surface of the upper substrate or a lower surface of the lower substrate) or an inner surface (e.g., a lower surface of the upper substrate or an upper surface of the lower substrate) of the upper substrate and / or the lower substrate of the display panel. The touch sensor (100) may be coupled to the display panel to form a touch screen panel (TSP).

[0068] The above display panel may be a flexible display panel or a rigid display panel.

[0069] The above display panel may have a plurality of scan lines (or gate lines) and a plurality of data lines arranged. Subpixels may be located in areas where the scan lines and data lines intersect.

[0070] The above touch input device may include a gate driving circuit, a data driving circuit, and a display control unit for driving various signal lines arranged on the display panel to drive the display panel.

[0071] The above gate driving circuit is controlled by a display control unit and can sequentially output display scan signals to a plurality of scan lines arranged on a display panel to control the driving timing of a plurality of subpixels.

[0072] The above data driving circuit can receive image data from the display control unit and convert the image data into an analog data voltage. The data driving circuit can control each subpixel to express brightness according to the image data by outputting a data voltage (Vdata) to each data line in accordance with the timing at which a scan signal is applied through the scan line.

[0073] The above display control unit supplies various control signals to the gate driving circuit and the data driving circuit, and can control the operations of the gate driving circuit and the data driving circuit. The display control unit may be configured separately from the control unit (300) illustrated in FIG. 5, or may be configured integrally with it.

[0074] FIG. 10 (a) and (b) are drawings for explaining the technical effects of a touch input device according to an embodiment of the present invention. FIG. 10 (a) is a drawing for explaining that a voltage change occurs in an ELVSS layer (20) of a display panel by a conventional multi-driving method, and FIG. 10 (b) is a drawing for explaining that a voltage change is minimized in an ELVSS layer (20) of a display panel by a multi-driving method according to an embodiment of the present invention.

[0075] Referring to (a) of Fig. 10, the main causes of the problems of the conventional multi-driving method described above with reference to Figs. 2 to 4, namely 1) occurrence of flicker in the display panel and 2) change in touch data according to the display screen and brightness, were that when predetermined touch driving signals were simultaneously applied to several driving electrodes (TX) selected during multi-driving, a voltage signal (Sc) was generated in the ELVSS layer (20) of the display panel. In particular, when the code sum of the touch driving signals becomes '2' or more, the voltage change of the voltage signal (Sc) becomes greater.

[0076] However, referring to (b) of FIG. 10, in the multi-driving method according to the embodiment of the present invention, since the sum of the codes for each time interval of the driving signals applied to the multiple driving electrodes (Tx) that are multi-driven is always '0', the voltage signal (Sc'') is generated very slightly or hardly generated in the ELVSS layer (20). Accordingly, the voltage change of the voltage signal (Sc'') in the ELVSS layer (20) can be minimized.

[0077] Meanwhile, in the LGM (low ground mass) state, a driving signal applied to the driving electrode (TX) through a touch conductor such as a user's finger may be output to the receiving electrode (RX), which may cause distortion in the touch data. However, according to the multi-driving method according to the embodiment of the present invention, since the code sum per time section of the driving signals applied to the multi-driven driving electrodes (Tx) is always '0', even if the touch input device is placed in the LGM state, the voltage signal (Sc'') in the ELVSS layer (20) can be minimized.

[0078] In addition, in the LGM state, the larger the touch area by the touch conductor, the more severe the distortion appears. However, according to the multi-driving method according to the embodiment of the present invention, even when the touch area is large, the distortion of the touch data output from the receiving electrode (RX) can be improved.

[0079] The features, structures, effects, etc. described in the embodiments above are included in one embodiment of the present invention and are not necessarily limited to just one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by those skilled in the art to which the embodiments pertain. Therefore, the contents related to such combinations and modifications should be construed as being included within the scope of the present invention.

[0080] In addition, although the above description focuses on embodiments, these are merely examples and do not limit the present invention. Those skilled in the art to which the present invention pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present embodiment. For example, each component specifically shown in the embodiments can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention defined in the appended claims.

[0081] [Explanation of symbols]

[0082] 100, 100', 100'': Touch sensor

[0083] 300: Control Unit

Claims

1. A touch sensor including a plurality of driving electrodes and a plurality of receiving electrodes; and A control unit that applies driving signals corresponding to a multi-driving code to driving electrodes selected from among the plurality of driving electrodes and determines a touch position based on detection signals received from the plurality of receiving electrodes; The above multi-drive code divides the drive signals into a number of time intervals, and is expressed by one of the codes '1' and '-1' for each time interval. The above multi-drive code is such that the sum of the codes of the drive signals for each time interval is '0', The above multi-drive code is, A first condition in which the sum of the codes of a pair of driving signals applied to a pair of driving electrodes among the selected driving electrodes for each time interval becomes '0'; During the first half of the entire driving time of the above multiple time sections, a pair of driving electrodes satisfying the first condition and a pair of driving electrodes satisfying a second condition different from each other during the second half of the time, Touch input device.

2. In paragraph 1, A touch input device, wherein during the first half of the time, one of the pair of driving electrodes satisfying the first condition is identical to one of the pair of driving electrodes satisfying the first condition during the second half of the time.

3. In paragraph 1, The above-mentioned selected driving electrodes are eight in number, A touch input device, wherein the above multi-drive code has first to eighth time sections.

4. In paragraph 3, If the above-mentioned selected driving electrodes are the 0th to 7th driving electrodes sequentially arranged in one direction, During the above first half time, a pair of driving electrodes satisfying the first condition are the 0th and 1st driving electrodes, the 2nd and 3rd driving electrodes, the 4th and 5th driving electrodes, and the 6th and 7th driving electrodes. A touch input device, wherein a pair of driving electrodes satisfying the first condition during the latter half of the above time period are the first and second driving electrodes, the third and fourth driving electrodes, the fifth and sixth driving electrodes, and the seventh and first driving electrodes.

5. In paragraph 1, A touch input device, wherein the control unit has a demodulation code for demodulating the detection signals.

6. In paragraph 1, further comprising a display panel; The above touch sensor is a touch input device disposed inside the display panel.

7. In paragraph 1, further comprising a display panel; The above touch sensor is a touch input device disposed above or below the display panel.

8. A control module for controlling a touch sensor of a touch input device including a plurality of driving electrodes and a plurality of receiving electrodes, A driving unit that applies driving signals corresponding to a multi-driving code to driving electrodes selected from among the plurality of driving electrodes; A sensing unit that receives reception signals from the plurality of receiving electrodes; and A control unit for determining a touch position based on the above detection signals is included; The above multi-drive code divides the drive signals into a number of time intervals, and is expressed by one of the codes '1' and '-1' for each time interval. The above multi-drive code is such that the sum of the codes of the drive signals for each time interval is '0', The above multi-drive code is, A first condition in which the sum of the codes of a pair of driving signals applied to a pair of driving electrodes among the selected driving electrodes for each time interval becomes '0'; During the first half of the entire driving time of the above multiple time sections, a pair of driving electrodes satisfying the first condition and a pair of driving electrodes satisfying a second condition different from each other during the second half of the time, Touch control module.

9. In paragraph 8, A touch control module further comprising a demodulation unit having a demodulation code for demodulating the above detection signals.

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