KR20160134273A - Touchscreen apparatus and method for sensing touch input - Google Patents

Abstract

According to an aspect of the present invention, a touch sensing method is performed in a touch screen apparatus. The touch sensing method includes the steps of: detecting a touch input with default detection sensitivity; detecting effective detection data in the detected touch input; determining a type of the touch input by using at least one of a maximum numerical value of the detected effective detection data and a detection area; and adjusting the detection sensitivity according to the determined type of the touch input.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch-

The present invention relates to a touch screen device and a touch sensing method.

A touch screen device such as a touch screen and a touch pad is an input device attached to a display device and capable of providing an intuitive input method to a user and is widely applied to various electronic devices such as a mobile phone, a PDA (Personal Digital Assistant) . In particular, as the demand for smart phones has recently increased, the adoption rate of touch screens has been increasing as a touch screen device capable of providing various input methods in a limited form factor.

The touch screen applied to a portable device can be divided into a resistance film type and a capacitance type according to a method of detecting the touch input. Among them, the capacitance type has a relatively long life and can easily implement various input methods and gestures Due to its merits, its application rate is increasing. In particular, the capacitance type is widely applied to a device such as a smart phone because it is easy to implement a multi-touch interface as compared with the resistance film type.

In recent years, in addition to a general touch which is directly applied by a finger or the like, a stylus or the like is adopted in recent years to receive a fine and precise touch, and a touch which is spaced by a certain distance from the touch panel can be inputted.

However, there is a problem that it is difficult to recognize an accurate touch because the magnitude of capacitance applied varies according to the type of touch.

The related art can be understood with reference to Korean Patent Laid-Open Publication No. 2002-0000426 or Korean Laid-Open Patent Publication No. 2008-0051657.

Korean Patent Laid-Open Publication No. 2014-0079414 Korean Patent Laid-Open Publication No. 2014-0120619

The present invention provides a touch screen device and a touch sensing method capable of determining a type of a touch input and setting an optimized touch environment according to a type of the determined touch input, will be.

One technical aspect of the present invention proposes a touch sensing method. The touch sensing method is performed in a touch screen device. The touch sensing method includes sensing a touch input with a default sensing sensitivity, detecting valid sensing data from the sensed touch input, sensing at least one of a maximum value and a sensing area of the sensed sensing data, Determining the type of the touch input, and adjusting the sensing sensitivity according to the determined type of the touch input.

Another technical aspect of the present invention proposes a touch screen device. The touch screen apparatus includes a panel unit including a plurality of driving electrodes and a plurality of sensing electrodes crossing the plurality of driving electrodes, a sensing circuit unit for sensing capacitance from the plurality of sensing electrodes, And an operation unit for detecting the valid sensing data for the input and determining the type of the touch input using at least one of the maximum value and the sensing area of the valid sensing data.

The solution of the above-mentioned problems does not list all the features of the present invention. Various means for solving the problems of the present invention can be understood in detail with reference to specific embodiments of the following detailed description.

According to the embodiment of the present invention, it is possible to determine the type of the touch input and set the optimized touch environment according to the type of the determined touch input.

1 is a perspective view illustrating an appearance of an electronic device having a touch screen device according to an embodiment of the present invention.
2 is a view illustrating a panel unit that may be included in a touch screen device according to an exemplary embodiment of the present invention.
3 is a cross-sectional view of a panel unit that may be included in a touch screen device according to an embodiment of the present invention.
4 is a diagram illustrating a touch screen device according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating a touch sensing method according to an exemplary embodiment of the present invention.
FIG. 6 is a view illustrating a touch sensing method according to an exemplary embodiment of the present invention. Referring to FIG.
7 to 9 are diagrams showing various examples of valid sensing data.
10 is a flowchart illustrating a touch sensing method according to an embodiment of the present invention.
FIG. 11 is a flowchart illustrating a step of determining a type of a touch input according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

1 is a perspective view illustrating an appearance of an electronic device having a touch screen device according to an embodiment of the present invention.

1, the electronic device 100 according to the present embodiment includes a display device 110 for outputting a screen, an input unit 120, an audio unit 130 for audio output, 110 may be integrated with the contact sensing device.

As shown in FIG. 1, in the case of a mobile device, the touch sensing device is generally integrated with the display device, and the touch sensing device must have a high light transmittance such that the screen displayed by the display device can transmit. Therefore, the contact sensing device is transparent to a base substrate of a transparent film material such as PET (polyethylene terephthalate), PC (polycarbonate), PES (polyethersulfone), PI (polyimide), PI (polyimide), PMMA (polymethylmethacrylate) Can be realized by forming a sensing electrode with a material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ZnO (Zinc Oxide), Carbon Nano Tube (CNT), or Graphene have. Further, the sensing electrode may be formed of a conductor thin wire (fine wire) made of any one of Ag, Al, Cr, Ni, Mo and Cu or an alloy thereof.

 A wiring pattern connected to a sensing electrode formed of a transparent conductive material is disposed in a bezel region of the display device. Since the wiring pattern is visually shielded by the bezel region, it is also formed of a metal material such as silver (Ag) or copper It is possible.

Since the touch sensing device according to the present invention is assumed to operate according to the capacitance method, it may include a plurality of electrodes having a predetermined pattern. A capacitive sensing circuit for detecting a change in electrostatic capacitance generated by a plurality of electrodes; an analog-to-digital conversion circuit for converting the output signal of the electrostatic capacitance sensing circuit into a digital value; An arithmetic circuit for judging an input, and the like.

2 is a diagram illustrating a panel unit that may be included in a touch screen device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the panel unit 200 includes a substrate 210 and a plurality of electrodes 220 and 230 provided on the substrate 210. Although not shown in FIG. 2, each of the plurality of electrodes 220 and 230 may be electrically connected to a wiring pattern of a circuit board attached to one end of the substrate 210 through wiring and a bonding pad. A controller integrated circuit is mounted on the circuit board to detect a sensing signal generated by the plurality of electrodes 220 and 230, and to determine a touch input therefrom.

A plurality of electrodes 220 and 230 may be provided on one side or both sides of the substrate 210. A plurality of electrodes 220 and 230 having rhombic or diamond patterns are shown in FIG. , Triangle, and the like.

The plurality of electrodes 220 and 230 include a first electrode 220 extending in the X-axis direction and a second electrode 230 extending in the Y-axis direction. The first electrode 220 and the second electrode 230 may be provided on both sides of the substrate 210 or alternatively may be provided on different substrates 210. If the first electrode 220 and the second electrode 230 are all provided on one surface of the substrate 210 A predetermined insulating layer may be partially formed at the intersection of the first electrode 220 and the second electrode 230. [

In addition to the area where the plurality of electrodes 220 and 230 are formed, the area where the wiring connected to the plurality of electrodes 220 and 230 is provided is not limited to the predetermined area for visually shielding the wiring formed of the opaque metal material. May be formed on the substrate 210.

A device electrically connected to the plurality of electrodes 220 and 230 to sense a touch input detects a change in capacitance generated in the plurality of electrodes 220 and 230 by a touch input and senses a touch input therefrom. The first electrode 220 may be coupled to a channel defined by D1 through D8 in the controller integrated circuit to receive a predetermined driving signal. The second electrode 230 may be connected to a channel defined by S1 through S8, The device can be used to detect the detection signal. At this time, the controller integrated circuit may detect a change in the mutual-capacitance generated between the first electrode 220 and the second electrode 230 as a sensing signal.

3 is a cross-sectional view of a panel unit that may be included in a touch screen device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the panel unit 200 shown in FIG. 2 cut in the YZ plane. In FIG. 3, the cover 210 includes a plurality of sensing electrodes 220 and 230, Cover Lens). The cover lens 240 is provided on the second electrode 230 used for detecting a sensing signal and receives a touch input from a touch object 250 such as a finger.

When a driving signal is applied to the first electrode 320 through the channels D1 to D8, a coupled capacitance is generated between the first electrode 220 and the second electrode 230 to which the driving signal is applied. When the contact lens 250 is brought into contact with the cover lens 240, the capacitance of the capacitance generated between the first electrode 220 and the second electrode 230, which is adjacent to the region where the contact object 250 is contacted, A change occurs. The change in the capacitance may be proportional to the area of the overlapped region between the contact object 250 and the first electrode 220 and the second electrode 230 to which the driving signal is applied. In FIG. 3, the channels D2 and D3 The coupled electrostatic capacitance generated between the first electrode 220 and the second electrode 230 connected to the contact object 250 is affected by the contact object 250.

4 is a diagram illustrating a touch screen device according to an exemplary embodiment of the present invention.

4, the touch screen device includes a panel unit 310, a driving circuit unit 320, a sensing circuit unit 330, a signal converting unit 340, and a calculating unit 350.

The driving circuit unit 320, the sensing circuit unit 330, the signal converting unit 340, and the calculating unit 350 may be implemented as one integrated circuit (IC). Or the driving circuit unit 320, the sensing circuit unit 330, the signal conversion unit 340 and the operation unit 350 may be implemented as separate integrated circuits (IC)

The panel unit 310 includes a plurality of first electrodes X1-Xm extending in the transverse direction of the first axis - FIG. 4, and a second axis X2-Xm extending in the longitudinal direction of FIG. And a plurality of second electrodes Y1-Yn. At this time, the node capacitors C11 to Cmn are equivalent expressions of the combined capacitance generated at the intersections of the first electrodes X1 to Xm and the second electrodes Y1 to Yn.

The driving circuit unit 320 applies a predetermined driving signal to the plurality of first electrodes X1 to Xm of the panel unit 310. [ The driving signal may be a square wave having a predetermined period and amplitude, a sine wave, a triangle wave, or the like, and may be sequentially applied to each of the plurality of first electrodes. 4, a circuit for generating and applying a driving signal is separately connected to each of a plurality of first electrodes. However, it is also possible to provide a driving signal generating circuit and a switching circuit for driving Of course, it is also possible to apply a signal. In addition, a driving signal may be applied to all the first electrodes at the same time, or a driving signal may be selectively applied to only a portion of the first electrodes.

The sensing circuit unit 330 detects the capacitances of the node capacitors C11-Cmn from the plurality of second electrodes Y1-Yn. The sensing circuit portion 330 may include a plurality of CV converters 335 each having at least one operational amplifier and at least one capacitor, and each of the plurality of CV converters 335 may include a plurality of second electrodes Y1 to Yn Lt; / RTI >

The plurality of CV converters 335 can output an analog signal by changing the electrostatic capacitance of the node capacitors C11 to Cmn to voltage signals. For example, each of the plurality of CV converters 335 includes an integrating circuit for integrating capacitance can do. The integrating circuit can integrate the capacitance to change it to a predetermined voltage and output it.

In FIG. 4, the configuration of the C-V converter 335 is shown to include the capacitor CF between the inversion stage and the output stage of the operational amplifier, but it goes without saying that the arrangement of the circuit configuration can be changed. Further, in FIG. 4, one operational amplifier and one capacitor are shown. Alternatively, a plurality of operational amplifiers and a plurality of capacitors may be provided

When the driving signals are sequentially applied to the plurality of first electrodes X1 to Xm, since the capacitances can be simultaneously detected from the plurality of second electrodes, the CV converter 335 can detect the number of the plurality of second electrodes Y1 to Yn n "

The signal converting unit 340 may convert the capacitance of the analog signal type output from the sensing circuit unit 340 into a digital signal SD. The digital signal SD is a digital value corresponding to the electrostatic capacity, hereinafter referred to as sensing data.

For example, the signal converting unit 340 may convert time-to-analog (TDC) signals into digital signals SD by measuring the time at which the analog signal output from the sensing circuit unit 330 reaches a predetermined reference voltage level, Digital Converter) circuit or an ADC (Analog-to-Digital Converter) circuit for measuring the amount of change of the level of the analog signal output from the sensing circuit unit 330 for a predetermined time and converting it into a digital signal SD.

 The calculation unit 350 determines the touch input applied to the panel unit 310 using the digital signal SD. The number, coordinates, and gesture operation of the touch input applied to the panel unit 310 can be determined using the digital signal SD.

The digital signal SD as a basis for determining the touch input by the operation unit 350 may be data obtained by digitizing the electrostatic capacitance changes C11 to Cmn. In particular, when the touch input is not generated and when the touch input is generated, As shown in FIG. In a capacitive touch screen device, a region where a conductive object is in contact appears to have a reduced capacitance compared to a region where no contact has occurred.

The operation unit 350 detects electrostatic capacitance, that is, effective sensing data for the touch input from the sensing data, and determines the type of the touch input using at least one of the maximum value and the sensing area of the sensed effective sensing data can do.

Here, the valid detection data can be calculated by subtracting the sensed data by the touch input from the sensed data (hereinafter, referred to as 'offset data') in which the touch input is not generated.

In one embodiment, the operation unit 350 may adjust the sensing sensitivity according to the type of the determined touch input. The operation unit 350 can determine the type of the touch input from the valid sensing data and adjust the sensing sensitivity according to the type of the touch input. For example, the operation unit 350 may determine the type of the touch input as gloves by using the valid sensing data, and may sensitively control the touch sensitivity when the sensing is determined to be a glove.

5 is a block diagram showing an embodiment of the operation unit shown in FIG. 4. Hereinafter, various embodiments of the operation unit 350 will be described with reference to FIG.

5, the operation unit 350 may include a detection sensitivity setting unit 351, an effective data calculation unit 352, and a touch type determination unit 353. [

The sensing sensitivity setting unit 351, the validity data calculating unit 352, and the touch type determining unit 353 may be implemented as one integrated circuit or an individual integrated circuit, respectively.

The detection sensitivity setting unit 351 receives the mode information provided from the electronic device interlocked with the touch screen device, and can set the default detection sensitivity set as the default if the mode information is the mode information corresponding to the standby mode.

The sensing sensitivity setting unit 351 can adjust the sensing sensitivity according to the type of touch. For example, if it is determined that the type of touch is the glove touch or the stylus pen touch, the sensing sensitivity setting unit 351 can increase the sensing sensitivity and sense the touch input more sensitively.

The effective data calculating unit 352 can calculate the effective sensing data from the capacitance according to the sensing sensitivity.

In one embodiment, the valid data calculating section 352 can set the sensed data in the case where there is no touch input at the default sensing sensitivity, as the offset data.

The touch type determination unit 353 can determine the type of the touch input using at least one of the maximum value of the valid sensing data and the sensing area.

In one embodiment, the touch type determination unit 353 may control the sensitivity setting unit 351 to change the sensing sensitivity according to the type of the determined touch input.

Here, the type of the touch input may include at least one of a general touch input, a stylus pen touch input, and a glove touch input.

In one embodiment, the touch type determination unit 353 can determine the type of the touch input by comparing the maximum value of the valid sensing data with the threshold value.

In another embodiment, the touch type determination unit 353 can determine the type of the touch input by comparing the sensed area of the valid sensing data with the critical area.

In another embodiment, the touch type determination unit 353 compares the maximum value of the valid sensing data with the threshold value, or compares the sensing area of the valid sensing data with the critical area to determine the type of the touch input .

In one embodiment, the touch type determination unit 353 may determine that the touch input is a general touch input if the maximum value of the valid sensing data is greater than or equal to a threshold value.

In one embodiment, if the maximum value of the valid sensing data is less than the threshold value and the sensing area of the valid sensing data is less than the critical area, the touch type determining unit 353 determines that the touch input is the stylus pen touch input .

In one embodiment, the touch type determination unit 353 may determine that the touch input is the glove touch input when the maximum value of the valid sensing data is less than the threshold value and the sensing area of the valid sensing data is not less than the critical area.

FIG. 6 is a diagram illustrating a touch sensing method according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIG. 6, a total of three graphs are shown. The first graph 610 is the sensing data when the user's touch input is not applied, and the data shown in the graph shown in the first graph 610 may be set as the above-described offset data.

The second graph 620 is sensed data obtained while the touch input of the user is applied. As described above, when a conductive object such as a finger touches the panel unit 310, the capacitance is escaped from the conductive object, and the sensed data is obtained in such a manner that the data value decreases in the peripheral region where the conductive object is in contact .

The third graph 630 indicates valid sensing data that can be calculated when subtracting the second graph 620 -sensive data from the first graph 610-offset value-. The operation unit 350 can determine that the touch input is applied when there is more valid sensing data than the predetermined threshold value among the valid sensing data.

7 is a diagram showing an example of valid detection data. Assuming that the first electrodes X1-Xm and the plurality of second electrodes Y1-Yn are 18 and 10, respectively, the plurality of first electrodes X1-X18 and the plurality of second electrodes Y1-Y10 Valid sensing data as shown in Fig. 7 can be obtained at each of the nodes that intersect.

For example, assuming that the reference value of the valid sensing data for setting the touch input is set to 100, the first touch group can be sensed in the example shown in FIG. However, the present embodiment is not limited to this, and it goes without saying that the touch group may correspond to a touch candidate region determined by a well-known touch separation algorithm.

8 is a diagram showing another example of valid detection data. In the example of FIG. 8, the second touch group can be detected if it is assumed that the reference value of the valid sensing data for setting the touch input is set to 100.

9 is a diagram showing another example of the validity detection data. In the example of FIG. 9, the third touch group can be detected assuming that the reference value of the effective sensing data for setting by the touch input is set to 100. FIG.

FIGS. 7 to 9 illustrate touch inputs of different kinds. In an embodiment of the present invention, the types of touch inputs can be determined using the touch groups. Also, the touch sensitivity can be adjusted according to the determined touch input.

For example, in one embodiment of the present invention, the touch screen device can determine that the maximum value of the valid sensing data is 1000 or more, and the glove or the stylus pen touch input if the maximum value is 1000 or more. In addition, if the sensing area of the valid sensing data of the touch input is less than 9 " in the critical area-illustrated example, the touch screen device can judge the stylus pen touch input. In this example, the touch screen device may determine that the first touch input is the general touch input, the second touch input is the glove touch input, and the third touch input is the stylus pen touch input.

10 is a flowchart illustrating a touch sensing method according to an embodiment of the present invention. The touch sensing method described below can be performed in the touch screen device described above with reference to FIGS.

Referring to FIG. 10, the touch screen device can detect a touch input with a default sensing sensitivity (S1010).

The touch screen device can detect valid sensing data in the sensed touch input (S1020)

The touch screen device may determine the type of the touch input using at least one of the maximum value of the valid sensing data and the sensing area (S1030).

The touch screen device may adjust the sensing sensitivity according to the determined type of the touch input (S1040).

In an embodiment of step S1010, the touch screen device may receive mode information provided from an electronic device associated with the touch screen device. If the mode information is the mode information corresponding to the standby mode, the touch screen apparatus can set the detection sensitivity to the default detection sensitivity.

In one embodiment of the step S1020, when a change in capacitance is sensed in the touch panel, the touch screen apparatus senses the changed capacitance and detects the sensed data by analog-to-digital conversion of the capacitance. The touch screen device may detect the valid sensing data by subtracting the offset data from the sensed data.

Here, the offset data may be sensed data when there is no touch input at the default sensing sensitivity.

In one embodiment of step S1030, the touch screen device may determine if the maximum value of the valid sensing data is greater than or equal to a threshold value. The touch screen device may determine whether the sensing area of the valid sensing data is greater than or equal to the critical area if the maximum value is less than the threshold value.

In one embodiment, the type of the touch input may include at least one of a general touch input, a stylus pen touch input, and a glove touch input.

FIG. 11 is a flowchart illustrating a step of determining a type of a touch input according to an embodiment of the present invention.

Referring to FIG. 11, if the maximum value of the valid sensing data is greater than or equal to the threshold value (S1031, Yes), the touch screen device can determine that the touch input is normal (S1033).

On the other hand, if the maximum value of the valid sensing data is less than the threshold value and the sensing area of the valid sensing data is equal to or larger than the critical area (S1032, YES), the touch screen apparatus can determine the input of the glove touch (S1034).

On the other hand, if the maximum value of the valid sensing data is less than the threshold value and the sensing area is less than the critical area (S1032, No), the touch screen apparatus can determine the stylus pen touch input (S1035).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

310:
320:
330:
340: Signal conversion section
350:
351: Detection sensitivity setting section
352: Valid data calculation unit
353: touch type judgment unit

Claims (21)

A touch sensing method performed on a touch screen device,
Sensing a touch input with a default sensing sensitivity;
Detecting valid sensing data in the sensed touch input;
Determining a type of the touch input using at least one of a maximum value and a sensing area of the detected valid data; And
Adjusting sensed sensitivity according to the determined type of the touch input;
The touch sensing method comprising:
2. The method of claim 1, wherein sensing the touch input comprises:
Receiving mode information provided from an electronic device associated with the touch screen device; And
Setting the detection sensitivity to the default detection sensitivity if the mode information is the mode information corresponding to the standby mode;
The touch sensing method comprising:
2. The method of claim 1, wherein detecting the valid sensing data comprises:
Sensing a changed electrostatic capacity when a change in capacitance is sensed in the touch panel;
Detecting the sensed data by analog-to-digital conversion of the capacitance; And
Subtracting the offset data from the sensing data to detect the valid sensing data; The touch sensing method comprising:
4. The method of claim 3,
Wherein the default sensing sensitivity is sensed data when there is no touch input.
The method of claim 1, wherein the step of determining the type of the touch input comprises:
Determining whether a maximum value of the valid sensing data is greater than or equal to a threshold value; And
Determining whether the sensing area of the valid sensing data is greater than or equal to a critical area if the maximum value is less than the threshold value; The touch sensing method comprising:
The method of claim 5, wherein the type of the touch input is
A general touch input, a stylus pen touch input, and a glove touch input.
7. The method of claim 6, wherein the step of determining the type of the touch input comprises:
Determining that the general touch input is performed if the maximum value of the valid sensing data is greater than or equal to a threshold value; The touch sensing method comprising:
7. The method of claim 6, wherein the step of determining the type of the touch input comprises:
Determining that the stylus pen touch input is performed if the maximum value of the valid sensing data is less than a threshold value and the sensing area of the valid sensing data is less than a critical area; The touch sensing method comprising:
7. The method of claim 6, wherein the step of determining the type of the touch input comprises:
Judging the glove touch input when the maximum value of the valid sensing data is less than the threshold value and the sensing area of the valid sensing data is not less than the critical area; The touch sensing method comprising:
A panel unit including a plurality of driving electrodes and a plurality of sensing electrodes crossing the plurality of driving electrodes;
A sensing circuit unit for sensing capacitance from the plurality of sensing electrodes; And
An operation unit for detecting valid sensing data for a touch input in the capacitance and determining a type of the touch input using at least one of a maximum value and a sensing area of the sensed effective data; The touch screen device comprising:
11. The apparatus according to claim 10, wherein the calculating unit
And the sensing sensitivity is adjusted according to the determined type of the touch input.
The method of claim 10, wherein the touch screen device
And a signal converter for converting the electrostatic capacitance into a digital value and outputting sensing data,
The operation unit
And detects the valid sensing data for the touch input from the sensing data output from the signal converting unit.
11. The apparatus according to claim 10, wherein the calculating unit
A sensing sensitivity setting unit for setting sensing sensitivity;
A valid data calculating unit for calculating effective sensing data in the capacitance according to the sensing sensitivity; And
A touch type determination unit for determining a type of a touch input using at least one of a maximum value and a sensing area of the valid sensing data; The touch screen device comprising:
14. The apparatus of claim 13, wherein the touch type determination unit
And controls the sensing sensitivity setting unit to change the sensing sensitivity according to the determined type of the touch input.
14. The apparatus of claim 13, wherein the detection sensitivity setting unit
Wherein the touch screen device receives mode information provided from an electronic device associated with the touch screen device, and sets a default sensing sensitivity if the mode information is mode information corresponding to a standby mode.
14. The apparatus of claim 13, wherein the valid data calculation unit
Detecting the valid detection data by subtracting offset data from the sensed data,
Wherein the sensing data is a digital value corresponding to the capacitance.
17. The apparatus of claim 16, wherein the valid data calculation unit
And sets the sensing data when the touch input is not present at the default sensing sensitivity as the offset data.
14. The apparatus of claim 13, wherein the touch type determination unit
Wherein the type of the touch input is determined by comparing a maximum value of the valid sensing data with a threshold value or by comparing a sensing area and a critical area of the valid sensing data.
19. The apparatus of claim 18, wherein the touch type determination unit
And determines that the touch input is a general touch input if the maximum value of the valid sensing data is greater than or equal to a threshold value.
19. The apparatus of claim 18, wherein the touch type determination unit
And judging the touch input as a stylus pen touch input when the maximum value of the valid sensing data is less than a threshold value and the sensing area of the valid sensing data is less than a critical area.
19. The apparatus of claim 18, wherein the touch type determination unit
Wherein the touch input is judged to be the glove touch input when the maximum value of the valid sensing data is less than the threshold value and the sensing area of the valid sensing data is not less than the critical area.

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