KR101661605B1 - Device for eliminating touch input error using a procedure flipping AP-Amp output signal where fabrication error of OA-Amp is reflected - Google Patents

Abstract

The touch input sensing device includes an integrating circuit; Sensing electrode assembly; A first switch assembly; And the second switch assembly may be adapted to selectively connect the second electrode to the first inverting input terminal of the first operational amplifier and the second inverting input terminal of the second operational amplifier.

Description

[0001] The present invention relates to a device for eliminating a touch input error by flicking an output waveform reflecting a process error of an operational amplifier,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch input sensing device, and more particularly, to a technique for eliminating a touch input error due to the process error by flipping an output waveform having an error value according to a process error of an operational amplifier characteristic to calculate an average value.

A user input to the terminal can be provided using a technique of sensing a touch input using a switched capacitor integrator circuit. An operational amplifier can be used in the switched-capacitor integration circuit, which may have process errors in its characteristics. At this time, the influence of the process error of the operational amplifier on the output waveform may accumulate during touch input sensing.

The touch input device of the terminal may have a plurality of sensing channels. Each sensing channel can sense whether or not a touch is input in a part of the entire area that accepts the touch input. In the touch input device of the terminal, different operational amplifiers may be used for each sensing channel, and the process errors of the operational amplifiers for each sensing channel may have different values. Therefore, the accumulated error of the output waveform of the switched-capacitor integration circuit according to the process error may be different for each sense channel. Therefore, there is a problem that the sensitivity of the touch input on each sensing channel is uneven.

An object of the present invention is to provide a configuration capable of reducing an output error for each sense channel and a method for controlling the same, even when an operational amplifier having different process errors is used for each sense channel in a touch input sensing device.

According to an aspect of the present invention, there is provided a touch input sensing apparatus including: an integrating circuit including a first operational amplifier connected to a first feedback capacitor and a second operational amplifier connected to a second feedback capacitor; A sensing electrode assembly including a capacitor including a first electrode and a second electrode, and a driving circuit for changing a potential of the first electrode with time; And a first switch assembly configured to selectively connect the second electrode to a first inverting input terminal of the first operational amplifier and a second inverting input terminal of the second operational amplifier. At this time, the first switch assembly connects the second electrode to the first inverted input terminal in accordance with the first pulse train and to the second inverted input terminal according to the second pulse train in the first operation mode And the second electrode may be connected to the second inverting input terminal according to the first pulse train and to the first inverting input terminal according to the second pulse train in the second operation mode.

The first switch assembly may include a first switch having one end connected to the second electrode and being turned on and off according to the first pulse train; A second switch whose one end is connected to the second electrode and which is turned on and off according to the second pulse train; A first terminal connected to the other terminal of the first switch, a second terminal connected to the other terminal of the second switch, the first terminal connected to the first inverted input terminal in the first operation mode, A third switch adapted to connect the first terminal to the second inverted input terminal in a second mode of operation and a second switch operable to connect the second terminal to the second inverted input terminal in the first mode of operation, Mode switch section including a fourth switch adapted to connect the second terminal to the first inverted input terminal.

Alternatively, the first switch assembly may include: a first switch, one end of which is connected to the first inverting input terminal and is turned on and off according to the first pulse train; A second switch whose one end is connected to the second inverting input terminal and which is turned on and off according to a second pulse train; A first terminal connected to the other terminal of the first switch, a second terminal connected to the other terminal of the second switch, a third terminal and a fourth terminal connected to the second electrode, A third switch for connecting the first terminal to the third terminal and for connecting the first terminal to the fourth terminal in the second operation mode, and a third switch for connecting the second terminal to the fourth terminal, And a fourth switch connected to the fourth terminal and configured to connect the second terminal to the third terminal in the second operation mode.

The touch input sensing device may include a fifth terminal connected to the first output terminal of the first operational amplifier, a sixth terminal connected to the second output terminal of the second operational amplifier, and an analog input terminal of the AD converter, And a second switch assembly including a seventh terminal and an eighth terminal connected to the sixth terminal, wherein the second switch assembly connects the fifth terminal to the seventh terminal in the third operation mode, And to connect the fifth terminal to the eighth terminal and the sixth terminal to the seventh terminal in a third mode of operation.

According to another aspect of the present invention, there is provided a touch input sensing apparatus including: an integrating circuit including a first operational amplifier connected to a first feedback capacitor and a second operational amplifier connected to a second feedback capacitor; A sensing electrode assembly including a capacitor including a first electrode and a second electrode, and a driving circuit for changing a potential of the first electrode with time; A first switch assembly adapted to selectively connect the second electrode to a first inverting input terminal of the first operational amplifier and a second inverting input terminal of the second operational amplifier; A fifth terminal connected to the first output terminal of the first operational amplifier, a sixth terminal connected to the second output terminal of the second operational amplifier, and a seventh terminal connected to the analog input terminal of the AD converter, RTI ID = 0.0 > 8 < / RTI > terminals. At this time, the first switch assembly connects the second electrode to the first inverted input terminal in accordance with the first pulse train and to the second inverted input terminal according to the second pulse train in the first operation mode And the second electrode may be connected to the second inverting input terminal according to the first pulse train and to the first inverting input terminal according to the second pulse train in the second operation mode.

According to another aspect of the present invention, there is provided a method of controlling a touch input sensing apparatus, the method comprising: driving the touch input sensing apparatus in the first operation mode; Resetting the touch input sensing device; And driving the touch input sensing device to the second operation mode.

According to another aspect of the present invention, there is provided a method of controlling a touch input sensing apparatus, the method comprising: driving the touch input sensing apparatus in the first operation mode to determine a difference between outputs of the first operational amplifier and the second operational amplifier Obtaining a first value relating to the first value; Resetting the touch input sensing device; Driving the touch input sensing device to the second operation mode to obtain a second value related to a difference between outputs of the first operational amplifier and the second operational amplifier; And obtaining a representative value of the first value and the second value.

According to another aspect of the present invention, there is provided a method of controlling a touch input sensing apparatus, the method comprising: driving the touch input sensing apparatus in a common mode of the first operation mode and the third operation mode, Obtaining a third value of the difference in the output of the second operational amplifier; Driving the touch input sensing device in a common mode of the first operation mode and the fourth operation mode to obtain a fourth value related to a difference between outputs of the first operational amplifier and the second operational amplifier; Driving the touch input sensing device in a common mode of the second operation mode and the third operation mode to obtain a fifth value about a difference between outputs of the first operational amplifier and the second operational amplifier; Driving the touch input sensing device to a common mode of the second operation mode and the fourth operation mode to obtain a sixth value relating to a difference between outputs of the first operational amplifier and the second operational amplifier; And obtaining a representative value of the third value, the fourth value, the fifth value, and the sixth value.

According to another aspect of the present invention, there is provided a touch input sensing apparatus including: an integrating circuit including a first operational amplifier connected to a first feedback capacitor and a second operational amplifier connected to a second feedback capacitor; A sensing electrode assembly including a capacitor including a first electrode and a second electrode, and a driving circuit for changing a potential of the first electrode with time; AD converter; And a mode changeover switch unit capable of changing a connection relationship of a first integration path and a second integration path that are formed to electrically connect the sensing electrode assembly, the integrating circuit, and the AD converter, . ≪ / RTI >

The switch assembly may be configured to selectively connect the second electrode to a first inverting input terminal of the first operational amplifier and a second inverting input terminal of the second operational amplifier. At this time, in the first operation mode, the second electrode is connected to the first inverted input terminal according to the first pulse train and to the second inverted input terminal according to the second pulse train. In the second operation mode, And the second electrode may be connected to the second inverting input terminal according to the first pulse train and to the first inverting input terminal according to the second pulse train.

The switch assembly may be configured to selectively connect an output terminal of the first operational amplifier and an output terminal of the second operational amplifier to a first input terminal and a second input terminal of the AD converter. In this case, in the third operation mode, the output terminal of the first operational amplifier is connected to the first input terminal of the AD converter and the output terminal of the second operational amplifier is connected to the second input terminal of the AD converter And to connect the output terminal of the first operational amplifier to the second input terminal of the AD converter and to connect the output terminal of the second operational amplifier to the first input terminal of the AD converter in the fourth operation mode have.

According to the present invention, even if different operational amplifiers are used for sensing channels in the touch input sensing device, it is possible to reduce the output error for each sensing channel and provide a method for controlling the same, There is an effect that can be done.

Figure 1 illustrates a touch screen device to which an embodiment of the present invention may be applied.
FIG. 2 illustrates an example of implementing the concept of the touch screen device of FIG.
FIG. 3 is a plan view of a conceptual structure of the touch screen device of FIG. 2; FIG.
4A illustrates a sensing circuit according to one embodiment.
4B shows an operation timing diagram of the circuit shown in Fig. 4A. Fig.
Fig. 5A shows another embodiment in which the circuit shown in Fig. 4A is modified.
5B shows an operation timing diagram in the circuit shown in Fig. 5A. Fig.
6 illustrates a structure of a touch input sensing apparatus according to an embodiment of the present invention.
7 is a timing diagram for explaining a method of controlling the touch input sensing apparatus according to FIG.
8A is a diagram illustrating a case where the first switch assembly operates in the first operation mode in the touch input sensing apparatus shown in FIG.
8B is a timing diagram of the first output terminal VOUT1 and the second output terminal VOUT2 of the circuit shown in FIG. 8A.
9A is a diagram illustrating a case where the first switch assembly operates in the second operation mode in the touch input sensing apparatus shown in FIG.
FIG. 9B is a timing diagram of the first output terminal VOUT1 and the second output terminal VOUT2 of the circuit shown in FIG. 9A.
FIG. 10 shows a touch input sensing apparatus according to another embodiment of the present invention.
11A and 11B are views for explaining a touch input sensing apparatus according to another embodiment of the present invention.
12A to 12C are flowcharts for explaining a method of controlling the touch input sensing apparatus according to Figs. 6 to 10. Fig.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein, but may be implemented in various other forms. The terminology used herein is for the purpose of understanding the embodiments and is not intended to limit the scope of the present invention. Also, the singular forms as used below include plural forms unless the phrases expressly have the opposite meaning.

1 shows a touch screen device 1 to which an embodiment of the present invention may be applied.

As shown in FIG. 1, the touch screen device may include a touch panel 101, a capacitance measurement circuit 120, and a touch discrimination unit 130.

The touch panel 101 includes a plurality of operation signal lines X1, X2, X3, ..., Xn 10 and a plurality of sensing signal lines Y1, Y2, Y3, ..., Ym 20). Although the operation signal line 10 and the sensing signal line 20 are shown as lines in FIG. 1 for the sake of convenience, they may be realized as an electrode pattern having a certain area. In this specification, the operation signal line 10 can be used in combination with terms such as an operation pattern, an operation line, an operation line, a working electrode, a driving electrode, a column electrode, , A sensing electrode, a row electrode, and the like.

The sensing node 110 may be provided as a basic concept for analyzing the touch point. The sensing node 110 may be defined by a sensing signal line and an operation signal line and each sensing node 110 may form a node capacitor 112. The node capacitor 112 is isolated from each other, And may be formed by an operation signal line and a sense signal line. In FIG. 1, the capacitance of the node capacitor 112 formed by the n-th operation signal line and the m-th sensing signal line is denoted by C nm.

The capacitance measuring circuit 120 is electrically connected to the plurality of operation signal lines 10 (X1, X2, X3, ..., Xn) and the plurality of sensing signal lines 20 (Y1, Y2, Y3, ..., Ym) And the capacitance Cnm of each node capacitor 112 is measured.

The touch determination unit 130 analyzes the amount of capacitance change based on the capacitance of each node capacitor measured by the capacitance measurement circuit 120 to detect a touch point input by the user.

2 shows an example of implementing the concept of the touch screen device 1 of Fig.

FIG. 2 is a conceptual structural view illustrating an operation of a touch screen panel in which a touch is directly performed in addition to an operation circuit and additional devices in an entire touch screen device 1 for determining whether or not an object is touched. The driving electrode 10 and the sensing electrode 20 may be made of a conductive material and the driving electrode 10 and the sensing electrode 20 are directly connected to the touch screen operation circuit and the additional devices through the electrodes, Can be used. Accordingly, it is possible to manufacture various touch screen panels according to the shapes of the driving electrode 10 and the sensing electrode 20.

In one embodiment, a dielectric 102 may be present between the driving electrode 10 and the sensing electrode 20. Accordingly, the driving electrode 10 and the sensing electrode 20, which are made of a conductive material, form a capacitor (capacitor) having a dielectric 102 therebetween. A protective window 103 may be present on the sensing electrode 20 to protect the touch screen panel including the driving electrode 10, sensing electrode 20, and dielectric 102. The presence of a touch object on the protection window 103 may cause a change in capacitance between the driving electrode 10 and the sensing electrode 20 of the touch screen panel.

Fig. 3 is a plan view of the conceptual structure of the touch screen device 1 of Fig.

3 (a) shows the driving electrode 10 and the sensing electrode 20 at the same time. FIG. 3 (b) shows the sensing electrode 20 and FIG. 3 (c) Lt; / RTI >

A plurality of driving electrodes 10 having a wide rectangular shape are formed on the touch screen device. When a voltage is applied to the driving electrode 10, an electric field is generated between the sensing electrode 20 and the driving electrode 10. The sensing electrode 20 may be relatively thinner than the driving electrode 10. Therefore, when the voltage is applied to the driving electrode 10, the sensing electrode 20 can not cover the driving electrode 10 because the sensing electrode 20 has a smaller area than the driving electrode 10. The electric field is generated in the direction of the sensing electrode 20 from the driving electrode 10. The electric field flows into the sensing electrode 20 when the touch is not generated but flows into the touched object when the touch is performed, The electric field formed between the driving electrodes 10 changes. This change results in a change in the capacitance of the sensing electrode 20 formed between the driving electrodes 10, and the presence or absence of touch can be determined by sensing the value of such capacitance by the sensing device.

2 and 3 illustrate one of the electrode patterns of various touch screens in order to facilitate understanding of the present invention, and the scope of the present invention is not limited by this example. For example, the sensing electrode and the driving electrode may be provided in the same layer. As another example, according to the prior art, it is possible to provide an embodiment in which the sensing electrode and the driving electrode are not separated from each other.

4A shows a sensing circuit 100 according to one embodiment.

FIG. 4B shows an operation timing diagram of the circuit 100 shown in FIG. 4A.

4A, the sensing circuit 100 according to an embodiment includes a first operational amplifier OA1, a second operational amplifier OA2, and a sensing electrode RX (i.e., a first terminal) And a capacitor C _M formed by an electrode TX (i.e., a second terminal).

The inverting input terminals of the first operational amplifier OA1 and the second operational amplifier OA2 are connected to the first terminal RX of the capacitor C _M through the first switch S1 and the second switch S2, And the second terminal TX of the capacitor C _M may be connected to the first potential VDD and the second potential GND through the switch SH and the switch SL. Hereinafter, for convenience of explanation, it is assumed that the second potential (GND) has a value of zero.

4B, the first switch S1 is turned on and off according to the first pulse train 51 and the second switch S2 is turned on according to the second pulse train 52. In this case, - off.

The inverting input terminal and the output terminal VOUT1 of the first operational amplifier OA1 are connected to each other through the first feedback capacitor C _S1 and the inverting input terminal and the output terminal VOUT2 of the second operational amplifier OA2 are connected to each other. May be coupled to each other through a second feedback capacitor (C _S2 ).

The non-inverting input terminals of the first operational amplifier OA1 and the second operational amplifier OA2 may be connected to the second potential VCM, respectively. The second electric potential VCM may be, for example, GND or may be a potential other than GND.

At this time, the reset switches SR1 and SR2 may be connected between the inverting input terminal and the output terminal of the first operational amplifier OA1 and the second operational amplifier OA2, respectively. When the reset switches SR1 and SR2 are turned on, both of the charges charged in the first feedback capacitor C _S1 and the second feedback capacitor C _S2 are discharged and the voltage across the first feedback capacitor C _S1 and the second feedback capacitor C _S2 can be made zero. According to the embodiment, the reset switch SR1 and the reset switch SR2 may operate at the same timing.

At this time, in order that the output values of the first operational amplifier OA1 and the second operational amplifier OA2 have a finite value, a characteristic that the potential measured at the inverting input terminal and the potential measured at the non-inverting input terminal must have the same value I have. That is, when the second potential VCM is applied to the non-inverting input terminals of the first operational amplifier OA1 and the second operational amplifier OA2, the first operational amplifier OA1 and the second operational amplifier OA2, The potential measured at the inverting input terminal of the second transistor M2 should have the same potential value as the second potential VCM.

However, when there is a process error in the operational amplifier of the circuit shown in FIG. 4A, when the second potential VCM is applied to the non-inverting input terminals of the first operational amplifier OA1 and the second operational amplifier OA2 The potential measured at the inverting input terminal of the first operational amplifier OA1 may have a value of VCM + e1 due to the error of e1, and the potential measured at the inverting input terminal of the second operational amplifier OA2 is e2 And the value of VCM + e2 can be obtained.

The error values e1 and e2 measured at the inverting input terminals of the operational amplifiers OA1 and OA2 may be accumulated as shown in the operation timing diagram of FIG. 4B. That is, the difference value between the output terminals of the operational amplifiers OA1 and OA2 can be defined as an output value, which is 3 * (e2-e1) + 6 * DELTA VOUT in Fig. 4B. If the process error was not present, the output value will be given as 6 * DELTA VOUT.

In the above description, only the influence of the process error on the virtual ground of the operational amplifier has been described. Actually, the error value 3 * (e2-e1) described above may be caused by the sum of the process errors existing in various portions of the operational amplifier .

5A shows another embodiment in which the circuit 100 shown in FIG. 4A is modified.

FIG. 5B shows an operation timing diagram in the circuit 100 'shown in FIG. 5A.

The circuit 100 'shown in FIG. 5A is connected to the second operational amplifier OA2, that the switch S1 in the circuit 100 shown in FIG. 4A is connected to the first operational amplifier OA1, The circuit 100 'shown in FIG. 5A shows that the switch S2 is connected to the second operational amplifier OA2 in the circuit 100 shown in FIG. 5A connected to the first operational amplifier OA1.

4A and 4B, the measured potentials at the inverting input terminals of the operational amplifiers OA1 and OA2 are accumulated as' 3 * (e1-e2) + 6 * DELTA VOUT May be reflected in the output value and output.

According to an embodiment of the present invention, the output value 3 * (e2-e1) + 6 * DELTA VOUT) shown in FIGS. 4A and 4B and the output value 3 * e1-e2) + 6 * DELTA VOUT, the values relating to the error values e1 and e2 disappear.

Hereinafter, a touch input sensing apparatus 200 according to an embodiment of the present invention will be described.

FIG. 6 illustrates a structure of a touch input sensing apparatus 200 according to an embodiment of the present invention.

6, the touch input sensing apparatus 200 according to an embodiment of the present invention includes a sensing electrode assembly 3, an integrating circuit 32, a first switch assembly 4, a second switch assembly (5), an AD converter (6), and a processing unit (7).

The first switch assembly 4 performs a function of flipping the difference value between the output values VOUT2 and VOUT1 of the integrating circuit 32. [ The first switch assembly 4 may be used for performing a first flipping process to compensate for an error of an output value in accordance with a process error between two OP-AMPs existing in the integrating circuit 32. Here, the first flipping process may refer to a process of changing a connection relationship between a pair of input ends of the first switch assembly 4 and a pair of output ends.

The second switch assembly 5 serves to flip the output value of the AD converter 6. The second switch assembly 5 may be used for performing a second flipping process to compensate for an error of the AD converter output value in accordance with a process error of the differential portion of the AD converter 6. [ Here, the second flipping process may refer to a process of changing a connection relationship between a pair of input terminals of the second switch assembly 5 and a pair of output terminals.

The sensing electrode assembly 3 includes a capacitor C _M formed by a first electrode TX 21 and a second electrode R X 22 and a capacitor C _M formed by a change in potential of the first electrode 21 with time And a driving circuit 31 for driving the driving circuit. At this time, the driving circuit 31 may include a fifth switch S5 connected to the first potential (ex: VDD) and a sixth switch S6 connected to the second potential (ex: GND) , The potential of the first electrode 21 may change according to the on / off states of the fifth switch S5 and the sixth switch S6.

The integrating circuit 32 may include a first operational amplifier 13 to which a first feedback capacitor 11 is connected and a second operational amplifier 14 to which a second feedback capacitor 12 is connected. At this time, the first operational amplifier 13 is provided with a first inverting input terminal and a first non-inverting input terminal, and the second operational amplifier 14 is provided with a second inverting input terminal and a second non-inverting input terminal Can be.

The first switch assembly 4 may include a first switch S1, a second switch S2, and a mode changeover switch unit 41. [ At this time, the mode changeover switch unit 41 is connected to the first terminal n11, the second terminal n21, the third terminal n12, the fourth terminal n22, the third switch (not shown) (Not shown).

At this time, the first switch assembly 4 selectively connects the second electrode 22 to the first inverting input terminal of the first operational amplifier 13 and the second inverting input terminal of the second operational amplifier 14 Can be.

And the first switch assembly 4 may be operated in the first operation mode or the second operation mode. In the first operation mode, a second electrode (22) is connected to the first inverted input terminal in accordance with the first pulse train, and a second electrode (22) is connected to the second inverted input terminal Lt; / RTI > And connecting the second electrode (22) to the second inverting input terminal in accordance with the first pulse train and connecting the second electrode (22) to the first inverting input terminal in accordance with the second pulse train in the second operation mode, Terminal.

At this time, in one embodiment of the present invention, one end of the first switch S1 is connected to the second electrode 22 and may be turned on and off according to the first pulse train. One terminal of the second switch S2 is connected to the second electrode 22 and may be turned on and off according to the second pulse train. At this time, the first terminal n11 may be connected to the other terminal of the first switch S1, and the second terminal n21 may be connected to the other terminal of the second switch S2. The third switch and the fourth switch in the mode changeover switch unit 41 are connected to the first terminal n11, the second terminal n21, the first inverted input terminal < RTI ID = 0.0 > , And the second inverted input terminal of the second inverter. At this time, although the third switch and the fourth switch are not shown in FIG. 6, they may be configured in the mode changeover switch unit 41 so as to perform the above-described functions.

At this time, the second switch assembly 5 may include a fifth terminal n13, a sixth terminal n23, a seventh terminal n14, and an eighth terminal n24. The fifth terminal n13 is connected to the first output terminal VOUT1 of the first operational amplifier 13 and the sixth terminal n23 is connected to the second output terminal VOUT2 of the second operational amplifier 14. [ Lt; / RTI > And the seventh terminal (n14) and the eighth terminal (n24) may be respectively connected to the analog differential input terminal of the AD converter (6).

At this time, the second switch assembly 5 may operate in the third operation mode or the fourth operation mode. In this case, in the third operation mode, the fifth terminal n13 is connected to the seventh terminal n14 and the sixth terminal n23 is connected to the eighth terminal n24. In the fourth operation mode, The fifth terminal n13 may be connected to the eighth terminal n24 and the sixth terminal n23 may be connected to the seventh terminal n14.

At this time, when the first switch assembly 4 operates in the first operation mode, the second switch assembly 5 may operate in either the third operation mode or the fourth operation mode. Also, when the first switch assembly 4 operates in the second operation mode, the second switch assembly 5 can operate in either the third operation mode or the fourth operation mode. That is, the first operation mode and the second operation mode can not occur at the same time, and the third operation mode and the fourth operation mode can not occur at the same time. However, the first operation mode and the third operation mode or the fourth operation mode may occur at the same time, and the second operation mode and the third operation mode or the fourth operation mode may occur at the same time.

The first operation mode, the second operation mode, the third operation mode, and the fourth operation mode will be described in detail with reference to FIGS. 8A to 9B.

FIG. 7 is a timing diagram for explaining a control method of the touch input sensing apparatus 200 according to FIG.

7, the touch input sensing apparatus 200 is reset at the time [t (3n + 1)]. At the time [t (3n + 2) And the value of the difference between the outputs of the first operational amplifier 13 and the second operational amplifier 14 is obtained at the time t (3n + 3) to store the output of the AD converter 6 . At this time, at any time point of the time period [t (3n + 1), t (3n + 2)] defined between [the time t (3n + 1)] and the time t The operation mode can be switched by the assembly 4 and the second switch assembly 5. [

7, when n = 0, the time t1, t2, t3, and n = 1, the time t4, t5, t6, n = 2 T7, t8, t9, and n = 3 in the case of the time t10, t11, and t12.

At this time, any time period is selected from the time period [t1 to t3], the time period [t4 to t6], the time period [t7 to t9], and the time period [t10 to t12] Can be defined as a second time interval (P2), a third time interval (P3), and a fourth time interval (P4). For example, the time period [t1 to t3] is the first time period P1, the time period [t4 to t6] is the second time period P2, the time period [t7 to t9] is the third time period P3, The time period [t10 to t12] may be defined as the fourth time period (P4). Alternatively, for example, the time period [t1 to t3] is the second time period P2, the time period [t4 to t6] is the first time period P1, and the time period [t7 to t9] ), And the time period [t10 to t12] may be defined as the third time period (P3).

In Fig. 7, the time period [t1 to t3] is the first time period P1, the time period [t4 to t6] is the second time period P2, the time period [t7 to t9] is the third time period P3, , And the time interval [t 10 to t 12] is defined as the fourth time interval P 4.

At this time, the touch input sensing apparatus 200 can be reset at the time [t1, t4, t7, t10], and the output of the AD converter 6 can be stored at the time [t3, t6, t9, t12].

At this time, the first switch assembly 4 and the second switch assembly 5 are driven in the first operation mode and the third operation, respectively, at any time point of the time period [t1, t2] of the first time interval P1, Mode. The first switch assembly 4 and the second switch assembly 5 are respectively operated in the first operation mode and the fourth operation mode at any one of the time periods [t4, t5] of the second time interval P2 Can be switched. The first switch assembly 4 and the second switch assembly 5 are respectively operated in the second operation mode and the third operation mode at any one of the time periods [t7, t8] of the third time period P3 Can be switched. The first switch assembly 4 and the second switch assembly 5 are respectively operated in the second operation mode and the fourth operation mode at any one of the time periods [t10, t11] of the fourth time interval P4 Can be switched. The output value of the integrating circuit 32 in the first time interval P1 and the second time interval P2 is given by 3 * (e2-e1) + 6 * DELTA VOUT, And the output value of the integrating circuit 32 in the fourth time interval P4 is given by 3 * (e1-e2) + 6 * DELTA VOUT.

In another modified embodiment, the first switch assembly 4 and the second switch assembly 5 respectively operate in the first operation mode and the third operation mode in the first time interval P1, The first operation mode and the fourth operation mode in the third time period P3, the second operation mode and the fourth operation mode in the fourth time period P4 have. It will be appreciated that various other embodiments are possible.

8A is a diagram illustrating a case where the first switch assembly 4 operates in the first operation mode in the touch input sensing apparatus 200 shown in FIG.

8B is a timing diagram of the first output terminal VOUT1 and the second output terminal VOUT2 of the circuit shown in FIG. 8A.

As shown in FIG. 8A, when the first switch assembly 4 operates in the first operation mode in the touch input sensing apparatus 200 according to the embodiment of the present invention, (n11) to the first inverting input terminal, and the fourth switch is adapted to connect the second terminal (n21) to the second inverting input terminal.

At this time, when the first switch assembly 4 operates in the first operation mode, the operation state of the second switch assembly 5 is operated in any one of the third operation mode or the fourth operation mode .

Referring to the timing diagram shown in FIG. 8B, the touch input sensing apparatus 200 is reset at time t (3n + 1) and at time t (3n + 2) (3 * (e2 (3n + 3)) concerning the difference between the outputs of the first operational amplifier 13 and the second operational amplifier 14 at the time [t -e1) + 6 * [Delta] VOUT) to store the output of the AD converter 6. [ That is, for example, when n = 0, the touch input sensing apparatus 200 is reset at time t1, integration is performed at time t2, and at time t3, the output VOUT1 of the first operational amplifier 13 and the second A first value relating to the difference of the output VOUT2 of the operational amplifier 14 can be obtained.

9A is a diagram illustrating a case where the first switch assembly 4 operates in the second operation mode in the touch input sensing apparatus 200 shown in FIG.

FIG. 9B is a timing diagram of the first output terminal VOUT1 and the second output terminal VOUT2 of the circuit shown in FIG. 9A.

9A, when the first switch assembly 4 operates in the first operation mode in the touch input sensing apparatus 200 according to the embodiment of the present invention, The terminal n11 may be connected to the second inverting input terminal, and the fourth switch may be adapted to connect the second terminal n21 to the first inverting input terminal.

At this time, when the first switch assembly 4 is operated in the second operation mode, the operation state of the second switch assembly 5 is operated in any one of the third operation mode and the fourth operation mode .

9B, the touch input sensing apparatus 200 is reset at the time [t (3n + 1)], and at the time t (3n + 2) (3 * (e1 (3n + 3)) with respect to the difference between the outputs of the first operational amplifier 13 and the second operational amplifier 14 at the time [t -e2) + 6 * [Delta] VOUT) to store the output of the AD converter 6. [ That is, for example, when n = 1, the touch input sensing apparatus 200 is reset at time t4, integration is performed at time t5, and at time t6, the output VOUT1 of the first operational amplifier 13 and the second A second value relating to the difference of the output VOUT2 of the operational amplifier 14 can be obtained.

FIG. 10 shows a touch input sensing apparatus 300 according to another embodiment of the present invention.

6 and FIG. 10 will be described. In the structure of the first switch assembly 4 of the touch input sensing device 200 shown in FIG. 6, in the touch input sensing according to another embodiment of the present invention shown in FIG. 10, The structure of the first switch assembly 8 of the device 300 can be changed.

That is, as shown in FIG. 10, one terminal of the first switch S1 may be connected to the first inverting input terminal and be turned on and off by the first pulse train. One terminal of the second switch S2 may be connected to the second inverting input terminal and be turned on and off according to the second pulse train. At this time, the first terminal n11 is connected to the other terminal of the first switch S1, the second terminal n21 is connected to the other terminal of the second switch S2, the third terminal n12, 4 terminal n22 may be connected to the second electrode 22. In this case, the third switch connects the first terminal n11 to the third terminal n12 in the first operation mode and connects the first terminal n11 to the fourth terminal n22 in the second operation mode. . At this time, the fourth switch connects the second terminal (n21) to the fourth terminal (n22) in the first operation mode and connects the second terminal (n21) to the third terminal (n12) in the second operation mode .

In Fig. 10, the remaining components except for the first switch assembly 8 and the functions therefor may be the same as those described in Fig.

Hereinafter, a touch input sensing apparatus according to another embodiment of the present invention will be described with reference to FIGS. 6, 11A, and 11B. FIG.

11A is a diagram for explaining a first integral path and a second integral path in the touch input sensing apparatus according to another embodiment of the present invention. FIG. 11B is a diagram showing a connection relationship of the first integral path shown in FIG. And the second integration path.

The touch input sensing apparatus according to another embodiment of the present invention may include an integrating circuit 32, a sensing electrode assembly 3, an AD converter 6, and a switch assembly 40.

The integrating circuit 32 may include a first operational amplifier 13 to which a first feedback capacitor 11 is connected and a second operational amplifier 14 to which a second feedback capacitor 12 is connected.

The sensing electrode assembly 3 includes a capacitor C _M comprising a first electrode 21 and a second electrode 22 and a driving circuit 31 for changing the potential of the first electrode 21 with time can do.

The switch assembly 40 changes the connection relationship of the first integral path formed to electrically connect the sensing electrode assembly 3, the integrating circuit 32, and the AD converter 6 and the connection relationship of the second integral path And a mode changeover switch unit capable of changing the mode.

For example, the mode changeover switch unit may include a first terminal n11, a second terminal n21, a third terminal n12, a fourth terminal n22, a third switch (not shown), and a fourth switch Not shown). Alternatively, the mode changeover switch unit may include a fifth terminal n13, a sixth terminal n23, a seventh terminal n14, and an eighth terminal n24.

At this time, the first integration path and the second integration path may be defined according to the configuration of the operational amplifiers 13 and 14 included in both terminals of each integration path and the respective integration paths. At this time, the connection relation of the first integration path and the connection relation of the second integration path are determined by the configuration of the operational amplifiers 13 and 14 included in the respective integration paths and the configuration of the AD converter 6 connected to the end of the integration path Can be defined by the polarity of the input terminal. At this time, the first integration path and the second integration path may be formed separately from the second electrode 22.

In this case, for example, the first integration path and the second integration path may be formed as four cases (Case 1 to Case 4) shown in FIG. 11A, and the connection relationships of the respective integration paths are shown in FIG. It can be like a bar.

That is, in Case 1, one terminal of the first integration path is connected to the second electrode 22, and the other terminal of the first integration path is connected to the '-terminal' of the AD converter 6, A first operational amplifier 13 may be included in the first integration path. At this time, one terminal of the second integration path is connected to the second electrode 22, and the other terminal of the second integration path is connected to the '+ terminal' of the AD converter 6, A second operational amplifier 14 may be included.

In case 2, one terminal of the first integration path is connected to the second electrode 22 and the other terminal of the first integration path is connected to the '+ terminal' of the AD converter 6, The second operational amplifier 14 may be included in the integration path. At this time, one terminal of the second integration path is connected to the second electrode 22 and the other terminal of the second integration path is connected to the '-terminal' of the AD converter 6, A first operational amplifier 13 may be included.

In Case 3, one terminal of the first integrating path is connected to the second electrode 22, and the other terminal of the first integrating path is connected to the '+ terminal' of the AD converter 6, The first operational amplifier 13 may be included in the integration path. At this time, one terminal of the second integration path is connected to the second electrode 22 and the other terminal of the second integration path is connected to the '-terminal' of the AD converter 6, A second operational amplifier 14 may be included.

In Case 4, one terminal of the first integration path is connected to the second electrode 22, and the other terminal of the second integration path is connected to the '-terminal' of the AD converter 6, The second operational amplifier 14 may be included in the integration path. At this time, one terminal of the second integration path is connected to the second electrode 22, and the other terminal of the second integration path is connected to the '+ terminal' of the AD converter 6, A first operational amplifier 13 may be included.

At this time, the switch assembly 40 is configured to selectively connect the second electrode 22 to the first inverting input terminal of the first operational amplifier 13 and the second inverting input terminal of the second operational amplifier 14 . At this time, in the first operation mode, the second electrode 22 is connected to the first inverted input terminal according to the first pulse train and to the second inverted input terminal according to the second pulse train. And to connect the second electrode 22 to the second inverting input terminal in accordance with the first pulse train and to the first inverting input terminal in accordance with the second pulse train in the second operation mode.

Alternatively, the switch assembly 40 selectively connects the output terminal of the first operational amplifier 13 and the output terminal of the second operational amplifier 14 to the first input terminal and the second input terminal of the AD converter 6, . At this time, in the third operation mode, the output terminal of the first operational amplifier 13 is connected to the first input terminal of the AD converter 6, and the output terminal of the second operational amplifier 14 is connected to the output terminal of the AD converter 6 2 input terminal. In the fourth operation mode, the output terminal of the first operational amplifier 13 is connected to the second input terminal of the AD converter 6 and the output terminal of the second operational amplifier 14 is connected to the first terminal of the AD converter 6 And may be connected to an input terminal.

Thus, the connection relation of the first integral path and the connection relation of the second integral path can be changed.

12A to 12C, a method of controlling the touch input sensing apparatuses 200 and 300 according to FIGS. 6 to 10 will be described. FIG.

FIG. 12A is a flowchart for explaining a first embodiment of a method for controlling the touch input sensing apparatuses 200 and 300 according to FIGS. 6 to 10. FIG.

FIG. 12B is a flowchart for explaining a second embodiment of a method for controlling the touch input sensing apparatuses 200 and 300 according to FIGS. 6 to 10. FIG.

12C is a flowchart for explaining a third embodiment of a method of controlling the touch input sensing apparatuses 200 and 300 according to FIGS. 6 to 10. FIG.

As shown in FIG. 12A, a method of controlling the touch input sensing apparatuses 200 and 300 according to the first embodiment may be implemented by performing steps S11 to S13 described later.

In step S11, the touch input sensing apparatuses 200 and 300 may be driven in the first operation mode.

In step S12, the touch input sensing apparatuses 200 and 300 may be reset.

In step S13, the touch input sensing apparatus 200, 300 may be driven in the second operation mode.

Meanwhile, as shown in FIG. 12B, a method of controlling the touch input sensing apparatuses 200 and 300 according to the second embodiment may be implemented by performing steps S21 to S24 described later.

In step S21, the touch input sensing apparatus 200 or 300 is driven in the first operation mode to acquire a first value related to the difference between the outputs of the first operational amplifier 13 and the second operational amplifier 14 can do.

In step S22, the touch input sensing apparatuses 200 and 300 may be reset.

In step S23, the touch input sensing device may be driven in the second operation mode to obtain a second value related to the difference between the outputs of the first operational amplifier 13 and the second operational amplifier 14.

In step S24, representative values of the first value and the second value can be obtained.

On the other hand, as shown in FIG. 12C, the method of controlling the touch input sensing apparatuses 200 and 300 according to the third embodiment can be implemented by performing steps S31 to S35 described later.

In step S31, the touch input sensing devices 200 and 300 are driven in the common mode of the first operation mode and the third operation mode to output the outputs of the first operational amplifier 13 and the second operational amplifier 14 The third value can be obtained.

In step S32, the touch input sensing apparatus 200 or 300 is driven in the common mode of the first operation mode and the fourth operation mode to output the outputs of the first operational amplifier 200 and the second operational amplifier 300 Lt; RTI ID = 0.0 > value. ≪ / RTI >

In step S33, the touch input sensing devices 200 and 300 are driven in the common mode of the second operation mode and the third operation mode to output the outputs of the first operational amplifier 200 and the second operational amplifier 300 Lt; RTI ID = 0.0 > 5 < / RTI >

In step S34, the touch input sensing devices 200 and 300 are driven in the common mode of the second operation mode and the fourth operation mode to output the outputs of the first operational amplifier 200 and the second operational amplifier 300 The sixth value relating to the difference between the first and second values.

In step S35, representative values of the third value, the fourth value, the fifth value, and the sixth value may be obtained.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the essential characteristics thereof. The contents of each claim in the claims may be combined with other claims without departing from the scope of the claims.

Claims (11)

An integrating circuit including a first operational amplifier having a first feedback capacitor connected thereto and a second operational amplifier having a second feedback capacitor connected thereto;
A sensing electrode assembly including a capacitor including a first electrode and a second electrode, and a driving circuit for changing a potential of the first electrode with time; And
A first switch assembly for selectively connecting the second electrode to a first inverting input terminal of the first operational amplifier and a second inverting input terminal of the second operational amplifier,
/ RTI >
The first switch assembly includes:
In the first operation mode, the second electrode is connected to the first inverted input terminal in accordance with the first pulse train and to the second inverted input terminal in accordance with the second pulse train,
And to connect said second electrode to said second inverting input terminal in accordance with a first pulse train and to said first inverting input terminal in accordance with a second pulse train in a second operating mode,
Touch input sensing device. The method according to claim 1,
The first switch assembly includes:
A first switch whose one end is connected to the second electrode and which is turned on and off according to the first pulse train;
A second switch whose one end is connected to the second electrode and which is turned on and off according to the second pulse train; And
A first terminal connected to the other terminal of the first switch, a second terminal connected to the other terminal of the second switch, the first terminal connected to the first inverted input terminal in the first operation mode, A third switch adapted to connect the first terminal to the second inverting input terminal in a first operating mode and a second switch operable to connect the second terminal to the second inverting input terminal in the first operating mode, A mode changeover switch unit including a fourth switch adapted to connect the second terminal to the first inverting input terminal;
/ RTI >
Touch input sensing device. The method according to claim 1,
The first switch assembly includes:
A first switch whose one end is connected to the first inverting input terminal and which is turned on and off according to the first pulse train;
A second switch whose one end is connected to the second inverting input terminal and which is turned on and off according to a second pulse train; And
A first terminal connected to the other terminal of the first switch, a second terminal connected to the other terminal of the second switch, a third terminal and a fourth terminal connected to the second electrode, A third switch for connecting the first terminal to the third terminal and for connecting the first terminal to the fourth terminal in the second mode of operation, and in the first mode of operation, And a fourth switch for connecting the second terminal to the third terminal in the second operation mode;
/ RTI >
Touch input sensing device. The method according to claim 1,
A fifth terminal coupled to the first output terminal of the first operational amplifier, a sixth terminal coupled to the second output terminal of the second operational amplifier, and a seventh terminal coupled to the analog input terminal of the AD converter, Further comprising a second switch assembly including a terminal,
The second switch assembly includes:
And to connect the fifth terminal to the seventh terminal and the sixth terminal to the eighth terminal in the third operation mode,
And to connect the fifth terminal to the eighth terminal and the sixth terminal to the seventh terminal in a fourth mode of operation,
Touch input sensing device. An integrating circuit including a first operational amplifier having a first feedback capacitor connected thereto and a second operational amplifier having a second feedback capacitor connected thereto;
A sensing electrode assembly including a capacitor including a first electrode and a second electrode, and a driving circuit for changing a potential of the first electrode with time;
A first switch assembly adapted to selectively connect the second electrode to a first inverting input terminal of the first operational amplifier and a second inverting input terminal of the second operational amplifier; And
A fifth terminal coupled to the first output terminal of the first operational amplifier, a sixth terminal coupled to the second output terminal of the second operational amplifier, and a seventh terminal coupled to the analog input terminal of the AD converter, A second switch assembly
/ RTI >
The first switch assembly includes:
In the first operation mode, the second electrode is connected to the first inverted input terminal in accordance with the first pulse train and to the second inverted input terminal in accordance with the second pulse train,
And to connect said second electrode to said second inverting input terminal in accordance with a first pulse train and to said first inverting input terminal in accordance with a second pulse train in a second operating mode,
Touch input sensing device. A method of controlling a touch input sensing device according to any one of claims 1 to 3,
Driving the touch input sensing device to the first operation mode;
Resetting the touch input sensing device; And
Driving the touch input sensing device to the second operation mode;
/ RTI >
A method of controlling a touch input sensing device. A method of controlling a touch input sensing device according to any one of claims 1 to 3,
Driving the touch input sensing device in the first operation mode to obtain a first value related to a difference between outputs of the first operational amplifier and the second operational amplifier;
Resetting the touch input sensing device;
Driving the touch input sensing device to the second operation mode to obtain a second value related to a difference between outputs of the first operational amplifier and the second operational amplifier; And
Obtaining a representative value of the first value and the second value;
/ RTI >
A method of controlling a touch input sensing device. A method of controlling a touch input sensing device according to claim 4,
Driving the touch input sensing device in a common mode of the first operation mode and the third operation mode to obtain a third value related to a difference between outputs of the first operational amplifier and the second operational amplifier;
Driving the touch input sensing device in a common mode of the first operation mode and the fourth operation mode to obtain a fourth value related to a difference between outputs of the first operational amplifier and the second operational amplifier;
Driving the touch input sensing device in a common mode of the second operation mode and the third operation mode to obtain a fifth value about a difference between outputs of the first operational amplifier and the second operational amplifier;
Driving the touch input sensing device to a common mode of the second operation mode and the fourth operation mode to obtain a sixth value relating to a difference between outputs of the first operational amplifier and the second operational amplifier; And
Obtaining representative values of the third value, the fourth value, the fifth value, and the sixth value;
/ RTI >
A method of controlling a touch input sensing device. An integrating circuit including a first operational amplifier having a first feedback capacitor connected thereto and a second operational amplifier having a second feedback capacitor connected thereto;
A sensing electrode assembly including a capacitor including a first electrode and a second electrode, and a driving circuit for changing a potential of the first electrode with time;
AD converter; And
And a mode changeover switch unit capable of changing the connection relationship of the first integration path and the second integration path that are formed to electrically connect the sensing electrode assembly, the integrating circuit, and the AD converter,
/ RTI >
Touch input sensing device. 10. The method of claim 9,
The switch assembly selectively connects the second electrode to a first inverting input terminal of the first operational amplifier and a second inverting input terminal of the second operational amplifier,
In the first operation mode, the second electrode is connected to the first inverted input terminal in accordance with the first pulse train and to the second inverted input terminal in accordance with the second pulse train,
And to connect said second electrode to said second inverting input terminal in accordance with a first pulse train and to said first inverting input terminal in accordance with a second pulse train in a second operating mode,
Touch input sensing device. 11. The method of claim 10,
The switch assembly selectively connects an output terminal of the first operational amplifier and an output terminal of the second operational amplifier to a first input terminal and a second input terminal of the AD converter,
The output terminal of the first operational amplifier is connected to the first input terminal of the AD converter and the output terminal of the second operational amplifier is connected to the second input terminal of the AD converter in the third operation mode,
And a fourth operational mode in which the output terminal of the first operational amplifier is connected to the second input terminal of the AD converter and the output terminal of the second operational amplifier is connected to the first input terminal of the AD converter,
Touch input sensing device.

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