KR102222682B1 - A touch input IC and device with reduced circuit volume and power consumption at a stand-by mode - Google Patents

Abstract

A touch input sensing device that provides a touch input operation mode and a touch input standby mode is disclosed. The touch input sensing device includes a plurality of electrodes and an AFE unit. The AFE unit includes a plurality of operational amplifiers, wherein each of the plurality of electrodes is connected to any one of the plurality of operational amplifiers in the touch input operation mode, the operation mode detection circuit unit including the plurality of operational amplifiers, the In the touch input standby mode, a standby mode detection circuit unit including a first standby mode operational amplifier to which two or more electrodes are electrically connected to each other and connected to each other, and a shared capacitor including a plurality of feedback capacitors And a mode conversion switch unit. In the touch input standby mode, the mode conversion switch unit includes both terminals of each of at least two or more of the plurality of feedback capacitors or all of the feedback capacitors, and an inverting input terminal and an output of the operational amplifier for the first standby mode. It is configured to connect to a terminal, and in the touch input operation mode, it is configured to connect both terminals of each of the plurality of feedback capacitors to an inverting input terminal and an output terminal of the operational amplifier corresponding to the respective feedback capacitors. have.

Description

{A touch input IC and device with reduced circuit volume and power consumption at a stand-by mode}

The present invention relates to an electronic device, and more particularly, to a touch input sensing device that is a user input means of a user device. In particular, the present invention relates to a method of reducing power consumption of the touch input sensing device without increasing the size of a chip in a standby mode in which a user is not using a user device, and a touch input sensing device thereof.

A touch input sensing device may be connected to the portable user device as a user input device for a user. Alternatively, the touch input sensing device may be installed in the user device. The touch input sensing device may provide an input area having a planar shape that is wider than an area of a fingertip. The touch input sensing device is configured to simply detect whether a user input has been made or/and determine a coordinate at which a user input has been made in the input area.

Various methods may be adopted as the operating principle of the touch input sensing device, and the touch input sensing device may be implemented by a well-known capacitive sensing method. For the capacitive sensing method, the touch input sensing device may include a plurality of transparent or opaque sensing electrodes. In order to detect the coordinates of the point where the touch input occurs in the input area, a plurality of capacitances whose values can be changed by the sensing electrodes must be continuously measured. In order to measure the plurality of capacitances, a plurality of sensing circuit modules may be connected to the plurality of sensing electrodes. In this case, in order to continuously measure the plurality of capacitances, the plurality of sensing circuit modules must continue to operate, and as a result, the amount of power consumption may increase in proportion to the number of the sensing circuit modules.

Meanwhile, in the present specification, a mode in which it is determined that a user input does not exist and operates may be referred to as a touch input standby mode of the user device or the touch input sensing device. In addition, assuming that a user input exists or occurs in the near future, a mode operating to determine the coordinates in which the user input occurs among the sensing regions may be referred to as a touch input operation mode of the user device or the touch input sensing device. .

In many cases, when the user device is turned on, a time period in which the user device is in the touch input standby mode may be longer than a time in which the user device operates in the touch input operation mode. If the method of operating the touch input sensing device in the touch input standby mode is the same as the method of operating in the touch input operation mode, the power consumption rate in the touch input standby mode is equal to the power consumption rate in the touch input operation mode. It will be the same or similar. In this case, it is necessary to reduce the amount of power used in the touch input standby mode in which coordinates of the user input are not calculated.

An object of the present invention is to provide a technology for minimizing an increase in the size of a chip employing the circuit as a technology for reducing power consumption in a touch input standby mode of a touch input sensing device.

A touch input sensing device providing a touch input operation mode and a touch input standby mode provided according to an aspect of the present invention includes a plurality of electrodes; And an AFE unit 40. In this case, the AFE unit may: ① detect an operation mode including the plurality of operational amplifiers, each of the plurality of electrodes being connected to any one of the plurality of operational amplifiers in the touch input operation mode as a plurality of operational amplifiers. Circuit portion 1402; ② in the touch input standby mode, a standby mode detection circuit unit 1401 including a first operational amplifier for standby mode to which two or more electrodes are electrically connected to each other, and an electrode formed by being electrically connected to each other; ③ a shared capacitor unit 1403 including a plurality of feedback capacitors; And ④ mode conversion switch unit 500; And the mode conversion switch unit, ① In the touch input standby mode, both terminals of each of at least two or more of the plurality of feedback capacitors, or all of the feedback capacitors, are inverted input terminals of the operational amplifier for the first standby mode. And an output terminal, and ② in the touch input operation mode, both terminals of each of the plurality of feedback capacitors are connected to an inverted input terminal and an output terminal of the operational amplifier corresponding to each of the feedback capacitors. It is structured to be.

In this case, a second switch unit 20 connected between the plurality of electrodes and the AFE unit; And an operation processing and driving control unit 50, wherein the operation processing and driving control unit connects the plurality of electrodes to each other in the touch input standby mode to connect to an inverted input terminal of the operational amplifier for the first standby mode. The second switch unit may be controlled so that the operation processing and driving control unit may be configured to control the operation of the mode conversion switch unit.

In this case, the mode conversion switch unit, ① in the touch input standby mode, is configured to separate both terminals of each of at least two or more of the plurality of feedback capacitors or of all of the feedback capacitors from the operation mode detection circuit unit, and And ② in the touch input operation mode, it may be configured to separate the feedback capacitor connected to the operational amplifier from the standby mode detection circuit.

In this case, it may further include a capacitor that is always connected between the inverting input terminal and the output terminal of at least one of the plurality of operational amplifiers and the first standby mode operational amplifier.

In this case, the standby mode detection circuit unit may further include a second operational amplifier for standby mode to which an electrode formed by electrically connecting two or more of the plurality of electrodes to each other in the touch input standby mode is connected. And the mode conversion switch unit, in the touch input standby mode, ① both terminals of each of at least some of the plurality of feedback capacitors, to the inverting input terminal and the output terminal of the operational amplifier for the first standby mode. And ② may be configured to connect both terminals of each of the other feedback capacitors among the plurality of feedback capacitors to an inverting input terminal and an output terminal of the second operational amplifier for standby mode. .

In this case, a capacitor that is always connected between the inverting input terminal and the output terminal of at least one of the plurality of operational amplifiers, the first standby mode operational amplifier, and the second standby mode operational amplifier may further include a capacitor. I can.

At this time, in the touch input standby mode, feedback capacitors of a first group among the plurality of feedback capacitors are connected in parallel between the inverting input terminal and the output terminal of the first standby mode operational amplifier, and the plurality of electrodes In the touch input operation mode, a first partial integrated electrode formed by electrically connecting all of the electrodes of the first group to be connected to the inverting input terminals of the operational amplifiers of the first group to which the feedback capacitors of the first group are respectively connected. May be connected to an inverting input terminal of the operation amplifier for the first standby mode in the touch input standby mode.

According to an aspect of the present invention, a touch input sensing IC that is connected to a plurality of electrodes and provides a touch input operation mode and a touch input standby mode may be provided. The touch input sensing IC is a plurality of operational amplifiers, wherein each of the plurality of electrodes is connected to any one of the plurality of operational amplifiers in the touch input operation mode. Circuit portion 1402; A standby mode detection circuit unit 1401 including a first standby mode operational amplifier to which two or more of the plurality of electrodes are electrically connected to each other in the touch input standby mode; A shared capacitor unit 1403 including a plurality of feedback capacitors; And a mode conversion switch unit 500; In this case, the mode conversion switch unit includes: ① In the touch input standby mode, at least two or more of the plurality of feedback capacitors or both terminals of each of the feedback capacitors are inverted input of the operational amplifier for the first standby mode. It is configured to be connected to a terminal and an output terminal, and ② in the touch input operation mode, both terminals of each of the plurality of feedback capacitors are connected to the inverting input terminal and output terminal of the operational amplifier corresponding to the respective feedback capacitors. It is configured to connect.

A touch input sensing IC provided according to another aspect of the present invention includes: a plurality of operational amplifiers; A first operational amplifier for standby mode; A shared capacitor unit including a plurality of feedback capacitors; ① In the touch input operation mode, each of the plurality of electrodes is connected to the corresponding operational amplifier, and ② in the touch input standby mode, at least some of the plurality of electrodes are connected to each other to form an integrated electrode. A second switch unit configured to connect the integrated electrode to the first standby mode operational amplifier; And ① both ends of each of the feedback capacitors in the touch input operation mode are connected to an inverting input terminal and an output terminal of each of the operational amplifiers corresponding thereto, and ② the plurality of feedback capacitors in the touch input standby mode. And a mode conversion switch unit configured to connect both ends of each of at least two or more of the feedback capacitors to the first standby mode operational amplifier.

According to the present invention, as a technology for reducing power consumption in a touch input standby mode of a touch input sensing device, a technology capable of minimizing an increase in the size of a chip employing the circuit can be provided.

1 shows a configuration of a touch input sensing device according to a comparative embodiment.
2 shows the configuration of a touch input sensing device according to an embodiment of the present invention.
FIG. 3 is for explaining the principle of operation in a touch input standby mode when the touch input sensing device shown in FIG. 2 operates in a mutual capacitive method.
FIG. 4 is for explaining the principle of operation in a touch input standby mode when the touch input sensing device modified from the touch input sensing device shown in FIG. 2 operates in a self-capacitive manner.
FIG. 5 is for explaining an embodiment of the standby mode detection circuit module 30_T when the touch input detection device modified from the touch input detection device shown in FIG. 2 operates in a self-capacitive manner.
6 is a timing diagram illustrating an operation method of the standby mode detection circuit module 30_T shown in FIG. 5.
7 is a compensation circuit according to an embodiment of the present invention, for explaining a compensation circuit for reducing a capacitance value of an integrated electrode viewed from an input terminal of a standby mode detection circuit module.
8 is a timing diagram for explaining the operating characteristics of the stray capacitance compensation circuit shown in FIG. 7 over time.
9 shows an example of the internal configuration of the charging current source and the discharge current source shown in FIG. 7 in detail.
10 is a compensation circuit according to another embodiment of the present invention, and shows an example of a compensation circuit for reducing a capacitance value of an integrated electrode viewed from an input terminal of a standby mode detection circuit module.
11 is a timing diagram for explaining the operating characteristics of the stray capacitance compensation circuit shown in FIG. 10 over time.
12 is an example of the configuration of a touch input sensing device according to an embodiment of the present invention, and shows an example in which only one standby mode sensing circuit module is provided and the standby mode sensing circuit module is distinguished from the sensing circuit modules.
13 is an example of a configuration of a touch input sensing device according to another embodiment of the present invention, in which two or more standby mode sensing circuit modules are provided, and each standby mode sensing circuit module is distinguished from the sensing circuit modules. .
14 is an example of a configuration of a touch input sensing device according to another embodiment of the present invention, in which only one standby mode detection circuit module is provided, and an example in which a specific detection circuit module serves as the standby mode detection circuit module Represents.
15 is an example of a configuration of a touch input sensing device according to another embodiment of the present invention, in which two or more standby mode sensing circuit modules are provided, of which the first standby mode sensing circuit module is distinguished from the sensing circuit modules. However, the second standby mode detection circuit module shows an example in which a specific detection circuit module is performed together.
16 is a diagram illustrating a relationship between the integrated electrode shown in FIG. 5 and N row electrodes and M column electrodes included in the touch screen panel.
17 is a diagram illustrating a connection relationship between an operational amplifier for a touch input standby mode and sensing circuit modules 30_1 to 30_N for a touch input operation mode according to the first embodiment of the present invention.
18 is a view for explaining a second embodiment, which is a modified embodiment of the first embodiment.
Fig. 19 shows a third modified embodiment of the first embodiment.
20 is a view for explaining a fourth embodiment, which is a modified embodiment of the third embodiment.

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 in the present specification, and may be implemented in various different forms. The terms used in the present specification are intended to aid understanding of the embodiments, and are not intended to limit the scope of the present invention. In addition, the singular forms used below also include plural forms unless the phrases clearly indicate the opposite meaning.

1 shows a configuration of a touch input sensing device according to a comparative embodiment.

The touch input sensing device 101 includes a touch screen panel 10, a first switch unit 120, a first AFE unit 130, a first TX driving unit 140, and a first calculation processing and driving control unit 150. can do.

The touch screen panel 10 may include N row electrodes Y1 to YN and M column electrodes X1 to XM. Arbitrary row electrodes and arbitrary column electrodes may be disposed on different layers, are insulated from each other, and may cross each other at one point. Any first row electrode and any other second row electrode extend in a row direction, respectively, and may be spaced apart from each other and disposed in parallel.

The first TX driver 140 may apply a driving pulse having a predetermined pattern to each of the column electrodes. To this end, each of the column electrodes may be connected to the first TX driver 140.

The first AFE unit 130 may include L sensing circuit modules 30_1 to 30_L. Here, for example, L may be a natural number of 1 to M+N. Each sensing circuit module may include operational amplifiers OA1 to OAL and feedback capacitors CS1 to CSL. The configuration of each sensing circuit module can be provided in various ways by the prior art. The M column electrodes and/or the N row electrodes may be connected to any one of the sensing circuit modules. Although only one operational amplifier is shown for each sensing circuit module, this is for convenience, and in some embodiments, two or more operational amplifiers may be included in each sensing circuit module.

When the sensing circuit module is implemented as a chip, since it can occupy an area of a certain level or more, there is a problem that the size of the chip increases as the number of sensing circuit modules increases. Therefore, instead of reducing the number of sensing circuit modules, a method in which one sensing circuit module is connected to several sensing electrodes in a time-division manner and time-sharing may be used.

The first switch unit 120 may be configured to constantly or selectively connect each of the row electrodes and/or the column electrodes to any one of the L sensing circuit modules.

The first switch unit 120 includes, for example, a first set of switches SX1 for selectively connecting each of the column electrodes to any one of the L sensing circuit modules 30_1 to 30_L. ~SXM).

In addition, the first switch unit 120 includes, for example, a second set of switches (set Y) configured to selectively connect each of the row electrodes to any one of the L sensing circuit modules 30_1 to 30_L. SY1~SYN).

The first operation processing and driving control unit 150 may control the first switch unit 120, the first AFE unit 130, and the first TX driving unit 140.

2 shows the configuration of a touch input sensing device according to an embodiment of the present invention.

The touch input sensing device 1 may include a touch screen panel 10, a switch unit 20, an AFE unit 30, a TX driving unit 4, and an operation processing and driving control unit 50.

The touch screen panel 10, the switch unit 20, the AFE unit 30, the TX driving unit 4, and the arithmetic processing and driving control unit 50 of the touch input sensing device 1 shown in FIG. 2, respectively, The touch screen panel 10 of the touch input sensing device 101 shown in FIG. 1, the first switch unit 120, the first AFE unit 130, the 1TX driving unit 140, and the first operation processing and driving control unit ( 150).

The touch screen panel 10 may include N row electrodes Y1 to YN and M column electrodes X1 to XM. Arbitrary row electrodes and arbitrary column electrodes may be disposed on different layers, are insulated from each other, and may cross each other at one point. Any first row electrode and any other second row electrode extend in a row direction, respectively, and may be spaced apart from each other and disposed in parallel.

The TX driver 4 may apply a driving pulse having a predetermined pattern to each of the column electrodes. To this end, each of the column electrodes may be connected to the TX driver 4.

The AFE unit 30 may include L sensing circuit modules 30_1 to 30_L. Here, for example, L may be a natural number of 1 to M+N. Each sensing circuit module may include operational amplifiers OA1 to OAL and feedback capacitors CS1 to CSL. The configuration of each sensing circuit module can be provided in various ways by the prior art. The M column electrodes and/or the N row electrodes may be connected to any one of the sensing circuit modules. Although only one operational amplifier is shown for each sensing circuit module, this is for convenience, and in some embodiments, two or more operational amplifiers may be included in each sensing circuit module.

In addition, the AFE unit 30 may include a standby mode detection circuit module 30_T. The standby mode detection circuit module 30_T may include a standby mode operational amplifier (OAT) and a feedback capacitor (CST). The configuration of the standby mode detection circuit module 30_T may be provided in various ways according to the prior art. Some or all of the M column electrodes and/or the N row electrodes may be connected together to be connected to an input terminal of the standby mode detection circuit module 30_T.

When the sensing circuit modules 30_1 to 30_L and the standby mode sensing circuit module 30_T are implemented as chips, the size of the chip increases as the number of sensing circuit modules increases. There is a problem. Therefore, instead of reducing the number of sensing circuit modules, a method in which one sensing circuit module is connected to several sensing electrodes in a time-division manner and time-sharing may be used.

The switch unit 20 may include a first switch unit 120 and a second switch unit 220. The first switch unit 120 may be a set of switches indicated by reference numerals SX1, ..., SXM, SXM, and SY1, ..., SYM, and SYM in the switch unit 20 of FIG. 2. The second switch unit 220 may be a set of switches indicated by reference numerals STX1, ..., STXM, STXM, and STY1, ..., STYM, STYM in the switch unit 20 of FIG. 2. For reference, a simplified diagram of a specific configuration included in the switch unit 20 is presented in FIGS. 12 to 15.

In a state in which the user device or the touch input sensing device is in the touch input operation mode, the first switch unit 120 may connect each of the row electrodes and/or the column electrodes to one of the L sensing circuit modules. It may be configured to be selectively connected to one.

At this time, in a preferred embodiment, when the user device or the touch input sensing device is in the touch input standby mode, all of the row electrodes and the column electrodes sense the L It may be configured not to be connected to any of the circuit modules 30_1 to 30_L.

To this end, the first switch unit 120 is, for example, of a first set (set X) for selectively connecting each of the column electrodes to any one of the L sensing circuit modules 30_1 to 30_L. It may include switches SX1 to SXM.

In addition, the first switch unit 120 includes, for example, a second set of switches (set Y) configured to selectively connect each of the row electrodes to any one of the L sensing circuit modules 30_1 to 30_L. SY1~SYN).

The second switch unit 220 detects the standby mode by connecting some or all of the row electrodes and/or the column electrodes to each other when the user device or the touch input sensing device is in the touch input standby mode. It may be configured to be connected to the input terminal of the circuit module 30_T.

In this case, in a preferred embodiment, when the user device or the touch input sensing device is in the touch input operation mode, both the row electrodes and the column electrodes detect the standby mode. It may be configured not to be connected to the input terminal of the circuit module 30_T.

To this end, the second switch unit 220 includes, for example, switches STX1 to STXM of a third set (set TX) to connect each of the column electrodes to the standby mode detection circuit module 30_T. can do.

In addition, the second switch unit 220 may include, for example, a fourth set of switches STY1 to STYN to connect each of the row electrodes to the standby mode detection circuit module 30_T. have.

The operation processing and driving control unit 50 may control the switch unit 20, the AFE unit 30, and the TX driving unit 4.

The operation processing and driving control unit 50 includes the first set of switches, the second set of switches, the third set of switches, and the switch unit 20 to perform the above-described operation. It is possible to control the operation of the fourth set of switches.

In addition, in a preferred embodiment, the operation processing and driving control unit 50 controls the standby mode detection circuit module 30_T to not operate in a state in which the user device or the touch input detection device is in the touch input operation mode, The L sensing circuit modules may be controlled to operate. And in a preferred embodiment, the operation processing and driving control unit 50 controls the standby mode detection circuit module 30_T to operate when the user device or the touch input detection device is in the touch input standby mode, and the L The four sensing circuit modules can be controlled so as not to operate.

Hereinafter, as described in FIGS. 3 and 4, the touch input sensing device according to embodiments of the present invention may operate in a mutual capacitive method or a self capacitive method. When operating in a mutual capacitance method, the configuration of the standby mode detection circuit module 30_T and the L detection circuit modules 30_1 to 30_L has the same configuration as disclosed in Korean Patent Registration No. 10-1544115, for example. In addition, the principle of operation may follow those disclosed in Korean Patent Registration No. 10-1544115. In contrast, when operating in the self-capacitance method, the configuration of the standby mode detection circuit module 30_T and the L detection circuit modules 30_1 to 30_L is the same as disclosed in Korean Patent Registration No. 10-1591293, for example. It may have, and its operation principle may also follow those disclosed in Korean Patent Registration No. 10-1591293.

FIG. 3 is for explaining the principle of operation in a touch input standby mode when the touch input sensing device shown in FIG. 2 operates in a mutual capacitive method.

In the case of operating in a mutual capacitance method, in a state in which the user device or the touch input sensing device is in the touch input operation mode, the N row electrodes Y1 to YN and the M column electrodes X1 to XM At least one electrode selected according to a predetermined method may be connected to each of the L sensing circuit modules. At this time, the third set of switches and the fourth set of switches are all turned off, so that the M column electrodes and the N row electrodes are not connected to the standby mode detection circuit module 30_T. can do.

At this time, in a state in which the user device or the touch input sensing device is in the touch input standby mode, switches STY1 to STYN of the fourth set (set TY) connect the N row electrodes Y1 to YN to each other. It can be connected to the standby mode detection circuit module 30_T (the switch unit 20 shown in FIG. 3 shows this case). In this case, the first set of switches, the second set of switches, and the third set of switches may all be turned off. In addition, the TX driver 4 may apply a pulse train only to any one of the M column electrodes X1 to XM, or a plurality or all of the M column electrodes X1 to XM. It is also possible to apply a pulse train to

In this case, the configuration of the standby mode detection circuit module 30_T and the L detection circuit modules may have the same configuration as disclosed in Korean Patent Registration No. 10-1544115, for example.

In a modified embodiment, in the touch input standby mode, all of the switches of the third set are kept on, and the switches of the first set, the switches of the second set, and the fourth set All of the switches of may be kept off. In another modified embodiment, in the touch input standby mode, all of the third set of switches and the fourth set of switches are maintained in an on state, and the first set of switches and the second All of the switches in the set may remain off.

FIG. 4 is for explaining the principle of operation in a touch input standby mode when the touch input sensing device modified from the touch input sensing device shown in FIG. 2 operates in a self-capacitive manner.

The modified touch input sensing device 1 ′ may be one in which the function of the TX driver 4 is removed from the touch input sensing device 1.

When operating in a self-capacitance method, in a state in which the user device or the touch input sensing device is in the touch input operation mode, the M column electrodes X1 to XM and the N row electrodes Y1 to YN One or more selected electrodes may be connected to each of the L sensing circuit modules. In this case, the third set of switches and the fourth set of switches may all be turned off.

In this case, in a state in which the user device or the touch input sensing device is in the touch input standby mode, switches STX1 to STXM of the third set (set TX) and switches STY1 of the fourth set (set TY) ~STYN) may be connected to the standby mode detection circuit module 30_T by connecting the M column electrodes X1 to XM and the N row electrodes Y1 to YN (shown in FIG. 4 ). The switch unit 20 shows this case). In this case, the first set of switches and the second set of switches may all be turned off.

In a modified embodiment, in the touch input standby mode, only one set of switches among the third set of switches and the fourth set of switches is maintained in an on state, and the other set of switches is in an off state. You can also keep it. In this case, both the first set of switches and the second set of switches may maintain an off state.

In this case, the configuration of the standby mode detection circuit module 30_T and the L detection circuit modules may have the same configuration as disclosed in Korean Patent Registration No. 10-1591293, for example.

FIG. 5 is for explaining an embodiment of the standby mode detection circuit module 30_T when the touch input detection device modified from the touch input detection device shown in FIG. 2 operates in a self-capacitive manner.

The standby mode detection circuit module 30_T includes an input terminal IN as an input terminal, and may include an output terminal a (VOUTa) and an output terminal b (VOUTb) as output terminals. The output terminal OUTT shown in FIG. 2 may output a difference value between a signal output from the output terminal a (VOUTa) and a signal output from the output terminal b (VOUTb). In addition, the input terminal IN shown in FIG. 5 may be connected to an integrated electrode 11 formed by connecting all of the M column electrodes X1 to XM and the N row electrodes Y1 to YN.

In another embodiment of the present invention, it is not necessary to connect all of the M column electrodes X1 to XM and the N row electrodes Y1 to YN to form the integrated electrode 11. This will be described later in FIGS. 12 to 15.

The standby mode detection circuit module 30_T may include an operational amplifier a (OAa) and an operational amplifier b (OAb).

The first reference voltage VREF_H may be applied to the non-inverting input terminal of the operational amplifier OAa, and the second reference voltage VREF_L may be applied to the non-inverting input terminal of the operational amplifier OAb.

The inverting input terminal of the operational amplifier OAa may be connected to the input terminal IN through the switch 61 and connected to the first reference voltage VREF_H through the switch 71. The inverting input terminal of the operational amplifier b (OAb) may be connected to the input terminal IN through the switch 62 and connected to the second reference voltage VREF_L through the switch 73.

The output terminal of the operational amplifier a (OAa) may be provided as the output terminal a (VOUTa), and may be connected to the second reference voltage VREF_L through the switch 72. The output terminal of the operational amplifier b (OAb) may be provided as an output terminal b (VOUTb), and may be connected to the first reference voltage VREF_H through the switch 74.

The output terminal and the inverting input terminal of the operational amplifier a (OAa) may be connected to each other by _{a first integrating capacitor C S1.} The output terminal and the inverting input terminal of the operational amplifier b (OAb) may be connected to each other by _{a second integrating capacitor C S2.}

Capacitance (C _SELF ) is the sum of the'sensing capacitance' formed between the integrated electrode 11 and the human finger and the sum of the floating capacitance formed between the integrated electrode 11 and an arbitrary part of the user's device. If there is no human finger near the integrated electrode 11, the value of the'sensing capacitance' may have a value close to 0, and _{the value of the capacitance C SELF} may have a value close to the stray capacitance. .

6 is a timing diagram illustrating an operation method of the standby mode detection circuit module 30_T shown in FIG. 5. In FIG. 6, the horizontal axis represents time.

The reset signal ?R is a signal that controls the on/off state of the switches 71, 72, 73, 74, and is a kind of reset signal.

The first control signal Φ ₁ is a signal for controlling the on/off state of the switch 61.

The second control signal Φ ₂ is a signal for controlling the on/off state of the switch 62.

When the first control signal (Φ ₁ ), the second control signal (Φ ₂ ), and the reset signal (Φ _R ) have a high value, the corresponding switch is turned on and has a low value. At this time, the corresponding switch is turned off.

A circuit unit including two switches 61 and 62 may be defined as a sensing circuit switch unit 410 that adjusts the direction of the current flowing through the input terminal of the standby mode sensing circuit module 30_T. Current may flow in or out through the input terminal of the standby mode detection circuit module 30_T according to the operation of the detection circuit switch unit 410.

In FIG. 6, the signal V _IN represents the voltage of the input terminal IN over time, and the magnitude of _{the signal V IN when the first control signal Φ 1} has a high value (ex It can be understood by the circuit configuration of FIG. 5 that VREF_H is greater than the magnitude of the signal V _IN when the second control signal Φ _{2 has a high value (ex: VREF_L).} .

The magnitude of the potential at the output terminal a (VOUTa) becomes the second reference voltage VREF_L when it is reset by the switches 71, 72, 73, 74. After that, each time the rising edge of the first control signal Φ ₁ is raised by a certain level. In this case, the rising level may ideally be determined by a relative ratio between the size of the _{capacitor C SELF} and the size of the first integrating capacitor C _S1. The reason is that the current I _{CSELF flowing through the capacitor C SELF} in the transition section according to the rising edge of _{the first control signal Φ 1 in} the circuit structure of FIG. 5 is all through the first integrating capacitor C _S1 . Because it flows.

The magnitude of the potential at the output terminal b (VOUTb) becomes the first reference voltage VREF_H when it is reset by the switches 71, 72, 73, 74. After that, each time the rising edge of the second control signal Φ _{2 falls to a certain level.} At this time, the falling level may ideally be determined by a relative ratio between the size of the _{capacitor C SELF} and the size of the second integrating capacitor C _S2. The reason is that the current I _{CSELF flowing through the capacitor C SELF} in the transition section according to the rising edge of _{the second control signal Φ 2 in} the circuit structure of FIG. 5 is all through the second integrating capacitor C _S2 . Because it flows.

The integrated electrode 11 is an electrode formed by connecting at least two or more of the M column electrodes X1 to XM and the N row electrodes Y1 to YN in parallel with each other. Accordingly, the self-capacitance and the mutual capacity formed by the integrated electrode 11 have a value greater than the self-capacitance and the mutual capacity formed by each of the column or row electrodes. As a result, the capacity of the feedback capacitor CST of the standby mode detection circuit module 30_T that is connected to the integrated electrode 11 to charge the charges moving through the integrated electrode 11 is one of the column electrodes or It is preferable to design it larger than the feedback capacitors CS1, ..., or CSL of any sensing circuit modules 30_1, ..., or 30_L connected to the row electrodes. However, when the capacity of the feedback capacitor CST of the standby mode detection circuit module 30_T is increased, a problem arises that the size of a chip including the standby mode detection circuit module 30_T increases. Therefore, in an embodiment of the present invention, the standby mode detection circuit module 30_T can perform a desired operation even in a state in which the capacity of the feedback capacitor CST of the standby mode detection circuit module 30_T is limited. To this end, a compensation circuit to be described later can be provided.

The value of the capacitance of the integrated electrode 11 viewed from the input terminal IN of the standby mode detection circuit module 30_T may be composed of a _{stray capacitance and a sensing capacitance C TOUCH.} In this case, the sensing capacitance C _TOUCH may be a value that varies depending on whether a user inputs a touch. In addition, the floating capacity may have a constant value. If the electrical properties of other devices included in the user equipment change over time, the value of the floating capacity may also change periodically or aperiodically according to time.

7 is a compensation circuit according to an embodiment of the present invention, for explaining a compensation circuit for reducing a value of the capacitance of the integrated electrode 11 viewed from the input terminal of the standby mode detection circuit module 30_T.

In order to reduce the capacitance value of the integrated electrode 11 connected to the input terminal IN of the standby mode detection circuit module 30_T, the integrated electrode 11 and the input terminal IN of the standby mode detection circuit module 30_T are connected. The floating capacity compensation circuit 60 is connected. In the present specification, the'floating capacity compensation circuit' may be simply referred to as a'compensation circuit'.

In FIG. 7, the current I _I may enter the standby mode detection circuit module 30_T from the integrated electrode 11, and the current I _CQ may enter the floating capacitance compensation circuit 60 from the integrated electrode 11.

The stray capacitance compensation circuit 60 according to an embodiment of the present invention may have a structure as shown in FIG. 7 in order to make the _{current I I} and the current I _{CQ have the same sign.} . The floating capacity compensation circuit 60 is a charging current source (I _CHG ) 121, a discharge current source (I _DCHG ) 122, and a connection to the integrated electrode 11 of the charging current source 121 and the discharge current source 122 It may include a compensation circuit switch unit 400 for controlling the state. The compensation circuit switch unit 400 may include a fourth switch SWL and a third switch SWH. The fourth switch SWL and the third switch SWH may be connected to the integrated electrode 11 and the standby mode detection circuit module 30_T at the input terminal IN of the standby mode detection circuit module 30_T.

The charging current source may be referred to as a fourth current source hereinafter, and the discharge current source may be referred to as a third current source hereinafter.

The fourth switch SWL may connect the output terminal of the charging current source 121 to the input terminal IN according _{to the fourth control signal Φ 4.} The third switch SWH may connect the output terminal of the discharge current source 122 to the input terminal IN according _{to the third control signal Φ 3.}

_{The current I CHG} provided by the charging current source 121 may be a DC current or a current having a predetermined waveform as a charging compensation current. _{The current I DCHG} provided by the discharge current source 122 may be a DC current or a current having a predetermined waveform as a discharge compensation current.

While the fourth switch SWL is kept on, the current I _CHG may be provided from the floating capacity compensation circuit 60 to the input terminal IN, and the amount of charge provided at this time may be given _{as Q COMP_CHG as follows.}

While the third switch (SWH) remains on, the current I _DCHG can enter the floating capacity compensation circuit 60 from the input terminal (IN), and the amount of charge provided at this time will be given _{as Q COMP_DCHG as shown in Equation 1 below.} I can.

[Equation 1]

The floating capacitance compensation circuit 60 is a circuit that makes the _{current I I} and the current I _{CQ have the same sign.} Therefore, both the current I _I and the current I _CQ may have a positive value or both may have a negative value. That is, if there is no floating capacity compensation circuit 60, some of the current to be input and output to the standby mode detection circuit module 30_T will be input and output to the floating capacity compensation circuit 60 because the floating capacity compensation circuit 60 is provided. I can. As a result, the amount of current input/output to the standby mode detection circuit module 30_T decreases, and thus the value of the capacitance of the integrated electrode 11 viewed from the input terminal IN of the standby mode detection circuit module 30_T is C _{COMP_CHG} Or it decreases by _{C COMP_DCHG.} In the case of the above circuit structure, when a touch input to the integrated electrode 11 is made _{and the value of the sensing capacitance (C TOUCH} ) becomes a non-zero value, _{the change in the sensing capacitance (C TOUCH} ) can be more sensitively detected. I can.

In the circuit shown in FIG. 7, the above-described sensing circuit switch unit 410 and the compensation circuit switch unit 400 operate in synchronization with each other, so that the current I _I input to the standby mode sensing circuit module 30_T and the stray capacitance _{The directions (ie, signs) of the current I CQ} input to the compensation circuit 60 may be synchronized so that they are equal to each other.

Preferably, in the compensation circuit switch unit 400, the third switch SWH and the fourth switch SWL are not in an ON state at the same time. _{For example, the third control signal Φ 3} for controlling the on/off of the third switch SWH may have the same pattern as the second control signal Φ ₂ of FIG. 6, and the fourth switch SWL is turned on. The fourth control signal Φ ₄ for controlling /off may have the same pattern as the first control signal Φ _{1 of FIG. 6.} That is, the rising edge of the third control signal Φ ₃ can be synchronized with the rising edge of the second control signal Φ ₂ , and the rising edge of the fourth control signal Φ ₄ is the first control signal Φ ₁ It can be synchronized with the rising edge of ).

Referring to FIG. 7, the touch input sensing device according to an embodiment of the present invention may include a standby mode sensing circuit module 30_T, a floating capacity compensation circuit 60, and an integrated electrode 11. . The input terminal of the standby mode detection circuit module 30_T and the output terminal of the floating capacity compensation circuit 60 may be connected to the integrated electrode 11 together. At this time, the standby mode detection circuit module 30_T may include a detection circuit switch unit 410 that adjusts the sign of _{the current I I input to the input terminal of the standby mode detection circuit module 30_T.} In addition, the floating capacity compensation circuit 60 may include a compensation circuit switch unit 400 operating in synchronization with the sensing circuit switch unit 410. The compensation circuit switch unit 400 is synchronized with the detection circuit switch unit 410, so that _{the sign of the current I I} input to the input terminal of the standby mode detection circuit module 30_T and the output of the floating capacity compensation circuit 60 _{The sign of the current I CQ} input to the terminal can be adjusted to be synchronized over time. Here can mean that the sign of the current (I _I) and the current (I _CQ) To be synchronized with time, changes also the sign of the current (I _CQ) at the moment the sign of the current (I _I) changes.

In this case, in the first embodiment according to the present invention, the signs of the _{current I I} and the current I _{CQ may be the same at a specific point in time.}

8 is a timing diagram for explaining the operating characteristics of the floating capacity compensation circuit provided according to the first embodiment of the present invention over time.

_{Referring to FIGS. 7 and 8 together, after the reset signal Φ R} for controlling the ON/OFF state of the switches 71, 72, 73, 74 changes from the ON state to the OFF state, the third control The signal Φ ₃ and the fourth control signal Φ ₄ have the following characteristics.

That is, the rising edge of the third control signal (Φ ₃ ) is synchronized with the rising edge of the second control signal (Φ ₂ ), and the rising edge of the fourth control signal (Φ ₄ ) is of the first control signal (Φ ₁ ). Synchronized to the rising edge.

At this time, the on-state duration of the third control signal (Φ ₃ ) may be shorter than the on-state duration of the second control signal (Φ ₂ ), and the on-state duration of the fourth control signal (Φ ₄ ) is the first It may be shorter than the on-state duration of the control signal Φ _1.

_{The change of the voltage V IN} at the input terminal IN may be synchronized with the first control signal Φ ₁ and the second control signal Φ _2.

VOUTa and VOUTb shown by solid lines in FIG. 8 represent outputs when the floating capacity compensation circuit 60 according to an embodiment of the present invention is used as shown in FIG. 7, and VOUTa' and VOUTb shown by dotted lines in FIG. 'Represents the output when the floating capacity compensation circuit 60 according to the embodiment of the present invention shown in FIG. 7 is not used. Unlike shown in FIG. 8, in the second embodiment according to the present invention, _{the rising edge of the third control signal Φ 3} is synchronized with the rising edge of the first control signal Φ _{1, and the fourth control signal (} The rising edge of Φ ₄ ) may be synchronized with the rising edge of the second control signal Φ _2.

The first embodiment described above has an effect of reducing the capacitance value of the integrated electrode viewed from the input terminal of the standby mode detection circuit module 30_T, whereas the second embodiment described above has an effect of reducing the input terminal of the standby mode detection circuit module 30_T. There is an effect of increasing the value of the capacitance of the integrated electrode as viewed from. Accordingly, the first embodiment described above increases the sensitivity of the standby mode detection circuit module 30_T, and the second embodiment described above has an effect of reducing the sensitivity of the standby mode detection circuit module 30_T.

9 shows an example of the internal configuration of the charging current source and the discharge current source shown in FIG. 7 in detail.

The charging current source 121 and the discharge current source 122 may have configurations corresponding to each other. Hereinafter, the charging current source and the discharging current source may be collectively referred to as current sources 121 and 122.

The charging current source 121 (= a fourth current source) includes a first transistor M1, a second transistor M2, a third transistor M3, and a source connected to a first potential (driving potential VDD). It may include 4 transistors (M4). In addition, a current source IREF1 connected to the drain of the first transistor M1 may be included.

The drain of the first transistor M1 may be connected to gates of the first transistor M1, the second transistor M2, the third transistor M3, and the fourth transistor M4.

Currents flowing through the drains of the second transistor M2, the third transistor M3, and the fourth transistor M4 may constitute at least a part or all _{of the output current I CHG of the charging current source 121.} have,

At this time, the charging current source 121 includes a fifth transistor M5 whose source is connected to the drain of the second transistor M2, a sixth transistor M6 whose source is connected to the drain of the third transistor M3, and the source is A seventh transistor M7 connected to the drain of the fourth transistor M4 may be included.

In this case, the size and shape of the output current of the charging current source 121 may be determined by the on-off state of the fifth transistor M5, the sixth transistor M6, and the seventh transistor M7.

On/off states of the fifth transistor M5, the sixth transistor M6, and the seventh transistor M7 may be controlled by the control signal unit 125.

The discharge current source 122 (= a third current source) includes a 16th transistor M16, a 15th transistor M15, a 14th transistor M14, and a source connected to a second potential (reference potential VEE). It may include 13 transistors (M13). In addition, a current source IRF2 connected to the drain of the 16th transistor M16 may be included.

The drain of the 16th transistor M16 may be connected to the gates of the 16th transistor M16, the 15th transistor M15, the 14th transistor M14, and the 13th transistor M13.

Currents flowing through the drains of the fifteenth transistor M15, the fourteenth transistor M14, and the thirteenth transistor M13 may constitute at least some or all _{of the output current I DCHG of the discharge current source 122.} have,

At this time, in the discharge current source 122, a 12th transistor M12 whose source is connected to the drain of the 15th transistor M15, an 11th transistor M11 whose source is connected to the drain of the 14th transistor M14, and the source are A tenth transistor M10 connected to the drain of the thirteenth transistor M13 may be included.

In this case, the size and shape of the output current of the discharge current source 122 may be determined by the on-off state of the twelfth transistor M12, the eleventh transistor M11, and the tenth transistor M10.

The on/off states of the twelfth transistor M12, the eleventh transistor M11, and the tenth transistor M10 may be controlled by the control signal unit 125.

The control signal unit 125 may receive the first control signal Φ ₁ and the second control signal Φ ₂ through terminals TE1 and TE2. The control signal unit 125 includes _{a third control signal Φ 3} and a fourth control signal Φ ₄ illustrated in FIG. 8 based on _{the first control signal Φ 1} and the second control signal Φ _2. Can be generated and output through terminals TE3 and TE4.

In FIG. 9, transistors M8 and M9 are respectively the switches SWL of FIG. Represents SWH.

Hereinafter, a touch input sensing device according to an embodiment of the present invention will be described with reference to FIGS. 7 to 8. This touch chip may include a standby mode detection circuit module 30_T and a compensation circuit 60. At this time, the input terminal IN of the standby mode detection circuit module 30_T and the output terminal of the compensation circuit are connected together to the integrated electrode 11, and flow through the input terminal of the standby mode detection circuit module 30_T. The direction change of the first current I _I and the direction change of the second current I _CQ flowing through the output terminal of the compensation circuit may be performed in synchronization with each other.

In this case, the sign of the first current and the sign of the second current may be the same. Alternatively, a sign of the first current and a sign of the second current may be different from each other.

At this time, the standby mode detection circuit module 30_T includes an operational amplifier a (OAa) and an operational amplifier b (OAb), and the non-inverting input terminal of the operational amplifier a (OAa) has a predetermined first reference voltage (VREF_H). ) Is applied, a second predetermined reference voltage (VREF_L) is applied to the non-inverting input terminal of the operational amplifier b(OAb), and the integrated electrode 11 is It may be selectively connected to the inverting input terminal of the 2-operation amplifier through the sensing circuit switch unit 410.

At this time, the operational amplifier a (OAa) and the operational amplifier b (OAb) each include an integrating capacitor (C _S1 , C _S2 ) for integrating the current flowing through the input terminal of the standby mode detection circuit module (30_T), , The output signal of the standby mode detection circuit module 30_T may be provided as a potential difference between the output terminal a (VOUTa) of the operational amplifier a (OAa) and the output terminal b (VOUTb) of the operational amplifier b (OAb). .

10 shows an example of a floating capacity compensation circuit 60 according to another embodiment of the present invention.

The floating capacity compensation circuit 60 may include a second compensation circuit switch unit 401 operating in synchronization with the sensing circuit switch unit 410. The second compensation circuit switch unit 401 is synchronized with the detection circuit switch unit 410, so that _{the sign of the current I I} input to the input terminal of the standby mode detection circuit module 30_T and the floating capacity compensation circuit 60 It can be adjusted so that the sign of _{the current I CQ} input to the output terminal of is synchronized with time. Here can mean that the sign of the current (I _I) and the current (I _CQ) To be synchronized with time, changes also the sign of the current (I _CQ) at the moment the sign of the current (I _I) changes.

In this case, in an embodiment according to the present invention, the signs of the _{current I I} and the current I _{CQ may be the same at a specific time point.}

11 is a timing diagram for explaining the operating characteristics of the stray capacitance compensation circuit shown in FIG. 10 over time.

In FIG. 11, the voltage VS at the output terminal of the operational amplifier 300 may be designed to follow a pattern of change over time of the _{signal V IN.} In addition, in the embodiment illustrated in FIG. 11, the pattern of the amount and sign of the charge Q _{comp accumulated in the compensation capacitor C comp may follow the pattern indicated by the voltage VS.}

Referring to FIGS. 10 and 11 together, the first compensation potential VRH has a voltage VREF_H' that is greater than the first reference voltage VREF_H, and the second compensation potential VRL is the second reference voltage ( It may have a voltage (VREF_L') smaller than VREF_L) (however, VREF_H>VREF_L).

Alternatively, in another embodiment according to the present invention, _{the signs of the current I I} and the current I _CQ may be different from each other at a specific point in time. In order to implement the another embodiment, the first compensation potential VRH shown in FIG. 11 is changed to have a voltage VREF_H″ smaller than the first reference voltage VREF_H, and the second compensation potential VRL is 2 It can be changed to have a voltage (VREF_L″) greater than the reference voltage (VREF_L) (however, VREF_H>VREF_L).

_{The above-described embodiment in which the signs of the current I I} and the current I _CQ are the same at a specific point in time has an effect of reducing the capacitance value of the touch input detection electrode viewed from the input terminal of the touch input detection circuit. _{On the other hand, the above-described another embodiment in which the signs of the current I I} and the current I _CQ are different from each other at a specific time point is to increase the capacitance value of the touch input detection electrode viewed from the input terminal of the touch input detection circuit. It works. Accordingly, the above-described embodiment increases the sensitivity of the touch input detection circuit, and the above-described another embodiment has the effect of reducing the sensitivity of the touch input detection circuit.

12 to 15 are for explaining various modified examples of the touch input sensing device provided by the present invention, and in particular, are for explaining a modified example of the configuration of the standby mode detection circuit module and the standby mode detection circuit module. .

In the touch input sensing device shown in FIG. 12, as shown in FIG. 2, only one standby mode detection circuit module 30_T is provided, and the standby mode detection circuit module 30_T includes the detection circuit modules 30_1 to 30_L. Represents an example that is distinguished from each other. At this time, the second switch unit 220 connects all of the N row electrodes Y1 to YN and the M column electrodes X1 to XM included in the touch screen panel 10 to each other to provide only the one It can be connected to the standby mode detection circuit module 30_T.

In the touch input sensing device shown in FIG. 13, two or more standby mode sensing circuit modules 30_T are provided, and each standby mode sensing circuit module 30_T is distinguished from the sensing circuit modules 30_1 to 30_L. Represents. In this case, the second switch unit 220 connects some of the N row electrodes Y1 to YN and the M column electrodes X1 to XM included in the touch screen panel 10 to each other to connect the two Connect to the first standby mode detection circuit modules 30_T and 311 among the above standby mode detection circuit modules 30_T, and a second of the two or more standby mode detection circuit modules 30_T. It can be connected to the standby mode detection circuit module (30_T, 312).

In the touch input sensing device shown in FIG. 14, only one standby mode detection circuit module 30_T is provided, and specific detection circuit modules (ex: 30_1) serve as the standby mode detection circuit module 30_T. Represents. In FIG. 14, the first detection circuit module 313 performs the function of the standby mode detection circuit module 30_T in the touch input standby mode, and performs the function of the detection circuit module 30_1 in the touch input operation mode. You can do it.

In the touch input sensing device shown in FIG. 15, two or more standby mode sensing circuit modules 30_T are provided, of which the first standby mode sensing circuit module 311 is mutually formed with the sensing circuit modules 30_1 to 30_L. Although classified, the second standby mode detection circuit module 313 represents an example in which the functions of specific detection circuit modules (ex: 30_1) are performed together. In FIG. 15, the first detection circuit module 313 performs the function of the standby mode detection circuit module 30_T in the touch input standby mode, and performs the function of the detection circuit module 30_1 in the touch input operation mode. You can do it. In this case, the second switch unit 220 connects some of the N row electrodes Y1 to YN and the M column electrodes X1 to XM included in the touch screen panel 10 to each other to connect the two Connect to the first standby mode detection circuit modules 30_T and 311 among the above standby mode detection circuit modules 30_T, and a second of the two or more standby mode detection circuit modules 30_T. It can be connected to the standby mode detection circuit module (30_T, 313).

In the touch input sensing device according to the preferred embodiment of the present invention described with reference to FIGS. 12 to 15, the number of the standby mode sensing circuit modules 30_T may always be smaller than the number L of the sensing circuit modules 30_1 to 30_L. have.

FIG. 16 is a diagram showing the relationship between the integrated electrode 11 shown in FIG. 5 and the N row electrodes Y1 to YN and M column electrodes X1 to XM included in the touch screen panel 10 to be.

An equivalent electrode formed by connecting all of the N row electrodes Y1 to YN and the M column electrodes X1 to XM to each other by the switch unit 20 may be referred to as the integrated electrode 11.

Alternatively, as described in FIGS. 13 and 15, when there are a plurality of standby mode detection circuit modules 30_T, the integrated electrode 11 connected to each standby mode detection circuit module 30_T is shown in FIG. Unlike one, only some of the N row electrodes Y1 to YN and the M column electrodes X1 to XM may be an equivalent electrode formed by being connected to each other.

2 to 6, when the capacity of the feedback capacitor CST of the standby mode detection circuit module 30_T is increased, the size of the chip including the standby mode detection circuit module 30_T increases. Occurs. Hereinafter, a structure according to various embodiments of the present invention for solving this problem will be described.

<First Example>

17 shows the structure of the first AFE units 40 and 41 according to the first embodiment of the present invention.

The first AFE units 40 and 41 may replace the functions of the AFE unit 30 shown in FIG. 2. By replacing the AFE unit 30 shown in FIG. 2 with the first AFE units 40 and 41, the touch input sensing device 1 shown in FIG. 2 may be provided.

The first AFE units 40 and 41 include first standby mode detection circuit units 1401 and 411, first operation mode detection circuit units 1402 and 412, first shared capacitor units 1403 and 413, and a mode conversion switch unit ( 500).

The first standby mode detection circuit units 1401 and 411 include the standby mode operational amplifier OAT shown in FIG. 2, but there is no feedback capacitor CST dedicated to the standby mode operational amplifier OAT.

The first operation mode detection circuit units 1402 and 412 include the operational amplifiers OA1 to OAL shown in FIG. 2 and peripheral components thereof, but do not include the feedback capacitors CS1 to CSL shown in FIG. 2. The feedback capacitors CS1 to CSL included in the first shared capacitor units 1403 and 413 illustrated in FIG. 17 may correspond to the feedback capacitors CS1 to CSL of FIG. 2, respectively.

The mode conversion switch unit 500 may include switches ST1 to STL belonging to the standby mode switch group and switches S1 to SL belonging to the operation mode switch group.

Switches (ST1 to STL) belonging to the standby mode switch group connect all of the feedback capacitors CS1 to CSL to the standby mode operational amplifier (OAT) in the touch input standby mode, and provide feedback in the touch input operation mode. It is possible to operate to separate all of the capacitors CS1 to CSL from the standby mode operational amplifier OAT. In the touch input standby mode, the feedback capacitors CS1 to CSL may be connected in parallel between an inverting input terminal and an output terminal of an operational amplifier OAT for standby mode.

The switches S1 to SL belonging to the operation mode switch group separate the feedback capacitors CS1 to CSL from the corresponding operational amplifiers OA1 to OAL, respectively, in the touch input standby mode, and the touch input operation mode The feedback capacitors CS1 to CSL may be connected to the corresponding operational amplifiers OA1 to OAL, respectively. For example, in the touch input operation mode, both terminals of the kth feedback capacitor CSk may be connected to the inverting input terminal and the output terminal of the kth operational amplifier OAk (k=1, 2, 3, ..., L).

Switches belonging to the operation mode switch group (S1 to SL) can remain off while the switches (ST1 to STL) belonging to the standby mode switch group remain on, and conversely, switches belonging to the operation mode switch group While the (S1 to SL) is maintained in the on state, the switches (ST1 to STL) belonging to the standby mode switch group may maintain the off state.

Assuming that one output voltage is provided by one operational amplifier and one feedback capacitor, at this time, L operational amplifiers OA1 to OAL are included in the first AFE units 40 and 41, and the feedback capacitor When L are included (CS1 to CSL), there are a total of 2*L switches (ST1 to STL) belonging to the standby mode switch group, and switches (S1 to SL) belonging to the operation mode switch group are There can be a total of 2*L.

By using the circuit shown in FIG. 17, even if a dedicated feedback capacitor CST is not provided on the feedback path between the inverting input terminal and the output terminal of the standby mode operational amplifier (OAT), the feedback capacitors CS1 to CSL The initial touch input signal can be detected by time-dividing and connecting it on the feedback path of the operational amplifier for standby mode (OAT).

In this case, as in the embodiment shown in FIG. 2, the inverting input terminal of the operational amplifier OAT for standby mode and the inverting input terminals of the operational amplifiers OA1 to OAL are according to the operation of the switch unit 20 shown in FIG. It may be connected to row electrodes and/or column electrodes. In addition, a reference voltage (VRT) may be provided to the non-inverting input terminal of the operational amplifier (OAT) for standby mode, and a reference voltage (VR) may be provided to the non-inverting input terminals of the operational amplifiers (OA1 to OAL). I can. In this case, the reference voltage VRT may be the same as or different from the reference voltage VR. The output terminals of the standby mode operational amplifier (OAT) and operational amplifiers (OA1 to OAL) are respectively corresponding to the output terminals of the standby mode operational amplifier (OAT) and operational amplifiers (OA1 to OAL) shown in FIG. I can.

According to the first embodiment described above, even if a dedicated feedback capacitor (CST) for the standby mode operational amplifier (OAT) is not provided, while providing the same effect as the touch input sensing device 1 shown in FIG. 2, the first AFE The size of the chip including the parts 40 and 41 may be limited to a certain level or less.

<Second Example>

18 is a view for explaining a second embodiment, which is a modified embodiment of the first embodiment.

18 shows the structure of the second AFE units 40 and 42 according to the second embodiment of the present invention.

The second AFE units 40 and 42 may replace the functions of the AFE unit 30 shown in FIG. 2 or the functions of the first AFE units 40 and 41 shown in FIG. 17.

The second AFE units 40 and 42 include second standby mode detection circuit units 1401 and 421, second operation mode detection circuit units 1402 and 422, second shared capacitor units 1403 and 423, and a mode conversion switch unit ( 500).

The second standby mode detection circuit units 1401 and 421, the second operation mode detection circuit units 1402 and 422, and the second shared capacitor units 1403 and 423 are respectively It corresponds to the mode detection circuit units 1401 and 411, the first operation mode detection circuit units 1402 and 412, and the first shared capacitor units 1403 and 413.

The structure of the second AFE unit (40, 42) is a dedicated feedback capacitor (CST0) that is always connected between the inverting input terminal and the output terminal of the standby mode operational amplifier (OAT), and the inverting input of the k-th operational amplifier (OAk). It is the same as the structure of the first AFE unit 40, 41, except that a dedicated feedback capacitor CSk0, which is always connected between the terminal and the output terminal, is further included (k=1, 2, 3, ..., L ).

In this case, the value of the feedback capacitor CST0 connected to the standby mode operational amplifier OAT shown in FIG. 18 may be smaller than the value of the feedback capacitor CST shown in FIG. 2.

<Third Example>

19 is a view for explaining a third embodiment, which is a modified embodiment of the first embodiment.

19 shows the structure of the third AFE unit 40 and 43 according to the third embodiment of the present invention.

The third AFE units 40 and 43 are the functions of the AFE unit 30 shown in Fig. 2, or the functions of the first AFE units 40 and 41 shown in Fig. 17, or the second AFE units 40 and 42 shown in Fig. 18. Can replace the function of.

The third AFE units 40 and 43 include third standby mode detection circuit units 1401 and 431, third operation mode detection circuit units 1402 and 432, third shared capacitor units 1403 and 433, and a mode conversion switch unit ( 500).

The third standby mode detection circuit units 1401 and 431, the third operation mode detection circuit units 1402 and 432, and the third shared capacitor units 1403 and 433 are respectively It corresponds to the mode detection circuit units 1401 and 411, the first operation mode detection circuit units 1402 and 412, and the first shared capacitor units 1403 and 413.

In the first embodiment described above, only one operational amplifier (OAT) for standby mode for the touch input standby mode is provided to the touch input sensing device.

The structure of the third AFE unit 40, 43 is the first AFE unit 40, except that the third standby mode detection circuit units 1401 and 431 are provided with two or more operational amplifiers OAT1 to OATK for standby mode. 41) is the same as the structure (K is a natural number of 2 or more).

Hereinafter, a connection relationship between the plurality of operational amplifiers for standby mode and the plurality of feedback capacitors included in the third shared capacitor units 1403 and 433 will be described.

In the touch input standby mode, a third shared capacitor part 1403, 433 between the inverting input terminal and the output terminal of any m-th operational amplifier for standby mode among the plurality of standby mode operational amplifiers OAT1 to OATK Feedback capacitors of the m-th group among the plurality of feedback capacitors included in may be connected in parallel. And in the touch input standby mode, a plurality of third shared capacitor units 1403 and 433 are included between the inverting input terminal and the output terminal of any of the plurality of standby mode operational amplifiers. Feedback capacitors of the n-th group of the feedback capacitors may be connected in parallel. In this case, n and m are different natural numbers, and m and n may each have a value of K or less. And none of the feedback capacitors of the m-th group belong to the n-th group.

In the example shown in FIG. 19, the feedback of the first group among the plurality of feedback capacitors included in the third shared capacitor units 1403 and 433 between the inverting input terminal and the output terminal of the first standby mode operational amplifier OAT1 Capacitors CS1, ..., CSM are connected in parallel. In addition, between the inverting input terminal and the output terminal of the K-th operational amplifier OATK, among the plurality of feedback capacitors included in the third shared capacitor units 1403 and 433, the feedback capacitors CSL,. .., CSN) are connected in parallel.

In the touch input standby mode, a third shared capacitor unit 1403, 433 between the inverting input terminal and the output terminal of the kth operational amplifier OATk of the plurality of standby mode operational amplifiers OAT1 to OATK Feedback capacitors of the kth group among the plurality of feedback capacitors included in) may be connected in parallel. At this time, among the operational amplifiers included in the third operation mode detection circuit unit 1402 and 432, the kth group of operational amplifiers comprising operational amplifiers to which the feedback capacitors of the kth group are respectively connected in the touch input operation mode are defined. can do. In the touch input operation mode, electrodes of a kth group including column electrodes and/or row electrodes connected to inverting input terminals of each of the kth group of operational amplifiers may be defined. In this case, in the touch input standby mode, a k-th integrated electrode 11_k formed by connecting all of the k-th group electrodes may be connected to an inverting input terminal of the k-th operational amplifier OATk for standby mode. Connecting each column electrode and/or row electrode to the specific operational amplifier or the specific operational amplifier for standby mode may be performed by the switch unit 20.

In the touch input standby mode, the switch unit 20 forms the k-th partial integrated electrode 11_k, and connects the formed k-th partial integrated electrode 11_k to the k-th operational amplifier OATk for standby mode. It can be controlled to connect to an inverting input terminal. In this case, the k-th partial integrated electrode 11_k is each of the k-th operational amplifiers in the touch input operation mode among N row electrodes Y1 to YN and M column electrodes X1 to XM. It may be composed of electrodes connected to the inverting input terminal of.

For example, in the example shown in FIG. 19, in the touch input operation mode, the first column electrode X1 is connected to the inverting input terminal of the first operational amplifier OA1 included in the first group of operational amplifiers, Similarly, the first row electrode Y1 is connected to the inverting input terminal of the Mth operational amplifier OAM included in the first group of operational amplifiers. In this case, in the touch input standby mode, the feedback capacitors CS1, ..., CSM of the first group are time-divided and shared with the operational amplifiers of the first group. A first partially integrated electrode 11_1 formed by connecting all of the electrodes of the first group including the first column electrode X1 and the first row electrode Y1 to the inverting input terminal may be connected.

Similarly, in the example shown in FIG. 19, in the touch input operation mode, the second column electrode X2 is connected to the inverting input terminal of the Lth operational amplifier OAL included in the Kth group operational amplifiers, Similarly, the second row electrode Y2 is connected to the inverting input terminal of the Nth operational amplifier OAN included in the Kth operational amplifiers. In this case, in the touch input standby mode, feedback capacitors CSL, ..., CSN of the Kth group are time-divided and shared with the operational amplifiers of the Kth group. A K-th integrated electrode 11_K formed by connecting all of the K-th group electrodes including the second column electrode X2 and the second row electrode Y2 to the inverting input terminal may be connected.

<Fourth Example>

20 is a view for explaining a fourth embodiment, which is a modified embodiment of the second embodiment and the third embodiment.

20 shows the structure of the fourthAFE units 40 and 44 according to the fourth embodiment of the present invention.

The fourth AFE units 40 and 44 are the functions of the AFE unit 30 shown in Fig. 2, or the functions of the first AFE units 40 and 41 shown in Fig. 17, or the second AFE units 40 and 42 shown in Fig. 18. The function of or the function of the 3AFE units 40 and 43 shown in FIG. 19 may be substituted.

The fourth AFE units 40 and 44 include fourth standby mode detection circuit units 1401 and 441, fourth operation mode detection circuit units 1402 and 442, fourth shared capacitor units 1403 and 443, and a mode conversion switch unit ( 500).

The fourth standby mode detection circuit units 1401 and 441, the fourth operation mode detection circuit units 1402 and 442, and the fourth shared capacitor units 1403 and 443 include third standby mode detection circuit units 1401 and 431, respectively, It corresponds to the third operation mode detection circuit units 1402 and 432 and the third shared capacitor units 1403 and 433.

The structure of the 4AFE units 40 and 44 is a dedicated feedback capacitor CSTk (k=1, 2, 3,. .., K), and the structure of the 3AFE unit (40, 43), except that a dedicated feedback capacitor (CSk0), which is always connected between the inverting input terminal and the output terminal of the k-th operational amplifier (OAk), is further included. Is the same as

The mode conversion switch unit 500 of FIGS. 17 to 20 may be controlled by the operation processing and driving control unit described in FIG. 2.

The above-described first AFE unit, second AFE unit, third AFE unit, and fourth AFE unit may be collectively referred to as an AFE unit.

Using the above-described embodiments of the present invention, those belonging to the technical field of the present invention will be able to easily implement various changes and modifications within the scope not departing from the essential characteristics of the present invention. The content of each claim in the claims may be combined with other claims that do not have a citation relationship within the range that can be understood through the present specification.

X1 to XM, Y1 to YN: a plurality of electrodes 10: touch screen panel
11: Integrated electrode 30_1~30_L: Multiple sensing circuit modules
30_T: Standby mode detection circuit module 4: TX driver
50: arithmetic processing and driving control unit 120: first switch unit
220: second switch unit 410: sensing circuit switch unit
40: AFE department
500: mode conversion switch unit
1401: standby mode detection circuit unit
1402: operation mode detection circuit unit
1403: shared capacitor part

Claims (10)

As a touch input sensing device that provides a touch input operation mode and a touch input standby mode,
A plurality of electrodes; And an AFE unit 40,
The AFE unit includes: ① an operation mode detection circuit unit including a plurality of operational amplifiers, wherein each of the plurality of electrodes is connected to any one of the plurality of operational amplifiers in the touch input operation mode ( 1402); ② in the touch input standby mode, a standby mode detection circuit unit 1401 including a first operational amplifier for standby mode to which two or more electrodes are electrically connected to each other, and an electrode formed by being electrically connected to each other; ③ a shared capacitor unit 1403 including a plurality of feedback capacitors; And ④ mode conversion switch unit 500; includes,
The mode conversion switch unit includes: ① In the touch input standby mode, both terminals of each of at least two or more of the plurality of feedback capacitors or all of the feedback capacitors are connected to an inverting input terminal of the operational amplifier for the first standby mode, and It is configured to connect to an output terminal, and ② in the touch input operation mode, connect both terminals of each of the plurality of feedback capacitors to an inverting input terminal and an output terminal of the operational amplifier corresponding to each of the feedback capacitors. Is composed,
At least one of the plurality of feedback capacitors is time-divided and connected to any one of the plurality of operational amplifiers and the first operational amplifier for standby mode,
Touch input sensing device. The method of claim 1,
A second switch unit 20 connected between the plurality of electrodes and the AFE unit; And an operation processing and driving control unit 50,
The operation processing and driving control unit is configured to control the second switch unit to connect the plurality of electrodes to each other in the touch input standby mode to connect to an inverting input terminal of the operational amplifier for the first standby mode,
The operation processing and driving control unit is configured to control the operation of the mode conversion switch unit,
Touch input sensing device. The method of claim 1, wherein the mode conversion switch unit comprises: ① In the touch input standby mode, at least two or more of the plurality of feedback capacitors or both terminals of each of all of the feedback capacitors are separated from the operation mode detection circuit unit. And ② in the touch input operation mode, configured to separate the feedback capacitor connected to the operational amplifier from the standby mode detection circuit. The apparatus of claim 1, further comprising a capacitor connected at any time between an inverting input terminal and an output terminal of at least one of the plurality of operational amplifiers and the first standby mode operational amplifier. The method of claim 1,
The standby mode sensing circuit unit further includes a second operational amplifier for standby mode to which an electrode formed by electrically connecting at least two other electrodes among the plurality of electrodes in the touch input standby mode is connected,
The mode conversion switch unit, in the touch input standby mode, ① connects both terminals of each of at least some of the feedback capacitors to an inverting input terminal and an output terminal of the operational amplifier for the first standby mode. And ② configured to connect both terminals of each of the other feedback capacitors among the plurality of feedback capacitors to an inverting input terminal and an output terminal of the second operational amplifier for standby mode,
Touch input sensing device. The capacitor of claim 5, wherein the capacitor is always connected between an inverting input terminal and an output terminal of at least one of the plurality of operational amplifiers, the first standby mode operational amplifier, and the second standby mode operational amplifier. Further comprising a touch input sensing device. The method of claim 5,
In the touch input standby mode, feedback capacitors of a first group of the plurality of feedback capacitors are connected in parallel between the inverting input terminal and the output terminal of the first standby mode operational amplifier,
Among the plurality of electrodes, in the touch input operation mode, all of the electrodes of the first group, which are connected to the inverting input terminals of the operational amplifiers of the first group to which the feedback capacitors of the first group are respectively connected, are electrically connected. The first partially integrated electrode is connected to an inverting input terminal of the operational amplifier for the first standby mode in the touch input standby mode,
Touch input sensing device. As a touch input sensing IC that is connected to a plurality of electrodes and provides a touch input operation mode and a touch input standby mode,
An operation mode detection circuit unit 1402 including the plurality of operational amplifiers, wherein each of the plurality of electrodes is connected to any one of the plurality of operational amplifiers in the touch input operation mode;
A standby mode detection circuit unit 1401 including a first standby mode operational amplifier to which two or more of the plurality of electrodes are electrically connected to each other in the touch input standby mode;
A shared capacitor unit 1403 including a plurality of feedback capacitors; And
A mode conversion switch unit 500;
Including,
The mode conversion switch unit may include: ① In the touch input standby mode, at least two or more of the plurality of feedback capacitors or both terminals of each of all of the feedback capacitors may be connected to an inverting input terminal of the operational amplifier for the first standby mode, and It is configured to connect to an output terminal, and ② in the touch input operation mode, connect both terminals of each of the plurality of feedback capacitors to an inverting input terminal and an output terminal of the operational amplifier corresponding to each of the feedback capacitors. be composed of,
Touch input detection IC. A plurality of operational amplifiers;
A first operational amplifier for standby mode;
A shared capacitor unit including a plurality of feedback capacitors;
① In the touch input operation mode, each of the plurality of electrodes is connected to the corresponding operational amplifier, and ② in the touch input standby mode, at least some of the plurality of electrodes are connected to each other to form an integrated electrode. A second switch unit configured to connect the integrated electrode to the first standby mode operational amplifier; And
① In the touch input operation mode, both ends of each of the feedback capacitors are connected to an inverting input terminal and an output terminal of each of the operational amplifiers corresponding thereto, and ② the plurality of feedback capacitors in the touch input standby mode A mode conversion switch unit configured to connect both ends of each of the at least two or more feedback capacitors to the first operational amplifier for standby mode;
Containing,
Touch input detection IC. As a touch input sensing device that provides a touch input operation mode and a touch input standby mode,
A plurality of electrodes; And an AFE unit 40,
The AFE unit includes: ① an operation mode detection circuit unit including a plurality of operational amplifiers, wherein each of the plurality of electrodes is connected to any one of the plurality of operational amplifiers in the touch input operation mode ( 1402); ② in the touch input standby mode, a standby mode detection circuit unit 1401 including a first operational amplifier for standby mode to which two or more electrodes are electrically connected to each other, and an electrode formed by being electrically connected to each other; ③ a shared capacitor unit 1403 including a plurality of feedback capacitors; And ④ mode conversion switch unit 500; includes,
The mode conversion switch unit includes: ① In the touch input standby mode, both terminals of each of at least two or more of the plurality of feedback capacitors or all of the feedback capacitors are connected to an inverting input terminal of the operational amplifier for the first standby mode, and It is configured to connect to an output terminal, and ② in the touch input operation mode, connect both terminals of each of the plurality of feedback capacitors to an inverting input terminal and an output terminal of the operational amplifier corresponding to each of the feedback capacitors. Is configured, or
The mode conversion switch unit, ① in the touch input standby mode, is configured to separate both terminals of each of at least two or more of the plurality of feedback capacitors or of all of the feedback capacitors from the operation mode detection circuit unit, and ② In the touch input operation mode, configured to separate the feedback capacitor connected to the operational amplifier from the standby mode detection circuit,
Touch input sensing device.

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