TWI819464B - Touch system core signal processing circuit and electronic equipment - Google Patents

Abstract

The invention provides a touch system center of gravity signal processing circuit and electronic equipment, wherein the processing circuit includes a signal acquisition unit, an operational amplification unit, a superposition amplification unit and a calculation unit connected in sequence. The above touch system center of gravity signal processing circuit, when the user touches the panel of the control system, collects the signal values of the center point and the center point of the touch area through the signal acquisition unit, and then amplifies the center point and center point of the touch area through the operational amplification unit peripheral signal values to obtain the center amplified signal value and multiple peripheral amplified signal values, and then superimpose and amplify the central amplified signal value and multiple peripheral amplified signal values through multiple superimposed amplification units to obtain the center point enhanced signal value, and finally The calculation unit uses a calculation algorithm to calculate the center point enhanced signal value to obtain accurate center point coordinates.

Description

Touch system core signal processing circuit and electronic equipment

The present invention relates to the field of electronic circuit technology, and in particular to a touch system center of gravity signal processing circuit and electronic equipment containing the circuit.

Multi-channel sensor devices, such as touch sensors on mobile devices, image sensing, or multi-channel human-machine interfaces, are generally equipped with touch systems to realize touch control devices and thereby improve user operations. Convenience.

When the existing touch system recognizes the center of gravity signal, it senses the signal change value of the touch position through the sensor, and then calculates the coordinates of the center point of the touch position through an algorithm based on the signal change value, and then implements the function of the corresponding position based on the coordinates of the center point. Can realize touch function.

According to the above control system center of gravity signal processing method, when the touch intensity is relatively weak, the signal change value is small, causing the algorithm to be unable to accurately calculate the coordinates of the center point, and the calculation error is large.

The object of the present invention is to provide a touch system center of gravity signal processing circuit and an electronic device containing the circuit, so as to solve the problem of large errors in the calculation of the center point coordinates of the existing touch system.

The invention provides a touch system center of gravity signal processing circuit, which includes a signal acquisition unit, an operational amplification unit, a superposition amplification unit and a calculation unit connected in sequence, wherein

A signal acquisition unit is used to collect signal values at the center point of the touch area and around the center point;

The operational amplification unit is used to amplify the signal values at the center point and the periphery of the center point in the touch area to obtain the central amplified signal value and multiple peripheral amplified signal values;

Multiple superimposed amplification units are used to superimpose and amplify the central amplified signal value and multiple peripheral amplified signal values to obtain the center point enhanced signal value;

The calculation unit is used to calculate the center point enhanced signal value to obtain the center point coordinates.

The above touch system center of gravity signal processing circuit, when the user touches the panel of the control system, collects the signal values of the center point and the center point of the touch area through the signal acquisition unit, and then amplifies the center point and center point of the touch area through the operational amplification unit peripheral signal values to obtain the center amplified signal value and multiple peripheral amplified signal values, and then superimpose and amplify the central amplified signal value and multiple peripheral amplified signal values through multiple superimposed amplification units to obtain the center point enhanced signal value, and finally The calculation unit uses a calculation algorithm to calculate the center point enhanced signal value to obtain accurate center point coordinates.

In one embodiment, the signal acquisition unit includes multiple signal acquisition circuits.

In one embodiment, the signal acquisition circuit includes a touch chip and a touch capacitor connected in series with the touch chip; wherein, the touch capacitor is used to obtain voltage changes at and around the center point of the touch area; the touch chip, It is used to obtain the signal values of the center point and the periphery of the center point of the touch area based on the voltage changes at the center point and the periphery of the center point of the touch area.

In one embodiment, the operational amplifier unit includes a plurality of charge amplification circuits, and the charge amplification circuits are connected in series with corresponding signal acquisition circuits.

In one embodiment, the charge amplification circuit includes an offset compensator and a feedback capacitor in series with the offset compensator.

In one embodiment, the superposition amplification unit includes three parallel superposition circuits, and the superposition circuit includes a first switch, a second switch, a first capacitor, a second capacitor, a third switch, a fourth switch, a fifth switch, a sixth switch, and a third switch. switch, a seventh switch and an eighth switch; wherein, one end of the first switch is connected to the operational amplifier unit and the second switch, the other end is connected in series with the third switch and one end of the first capacitor, the other end of the third switch is grounded, and the first The other end of the capacitor is connected to one end of the fifth switch and the seventh switch, the other end of the fifth switch is connected to ground, the other end of the seventh switch is connected to the seventh switch of another superposition circuit; one end of the second switch is connected to the operational amplifier unit It is connected to the first switch, and the other end is connected to the fourth switch and one end of the second capacitor. The other end of the fourth switch is connected to ground. The other end of the second capacitor is connected to one end of the sixth switch and the eighth switch. The sixth switch The other end is grounded, and the other end of the eighth switch is connected to the eighth switch of another superposition circuit; the three superposition circuits in the central superposition amplification unit are respectively connected to the two superposition circuits in the adjacent superposition amplification unit, and the central position One end of the superposition amplification unit is connected to the corresponding operational amplifier unit, and the other end is connected to the computing unit.

In one embodiment, a holding unit is provided between the calculation unit and the superposition amplification unit.

In one embodiment, the holding unit includes: a first amplifier, a first holding capacitor, and a second holding capacitor. The first amplifier includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first The input end is connected to the other end of the corresponding seventh switch, the second input end is connected to the other end of the corresponding eighth switch, and both ends of the first holding capacitor are electrically connected to the first input end and the first output end respectively. Two ends of the two holding capacitors are electrically connected to the second input terminal and the second output terminal respectively.

In one embodiment, the holding unit further includes a first reset switch and a second reset switch for respectively controlling the discharge of the first holding capacitor and the second holding capacitor.

The present invention also provides an electronic device, including a device body and a touch system provided in the device body. The touch system includes any of the above touch system center of gravity signal processing circuits.

The following specific embodiments will further illustrate the present invention in combination with the above drawings.

In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the invention are shown in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It should be noted that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present. The terms "vertical," "horizontal," "left," "right" and similar expressions are used herein for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the invention belongs. The terminology used herein in the description of the invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to Figure 1. A touch system center of gravity signal processing circuit provided by the first embodiment of the present invention includes a signal acquisition unit 10, an operational amplification unit 20, a superposition amplification unit 30 and a calculation unit 40 connected in sequence, wherein

The signal acquisition unit 10 is used to collect signal values at the center point of the touch area and around the center point;

The operational amplification unit 20 is used to amplify the signal values at the center point and the periphery of the center point of the touch area to obtain the central amplified signal value and multiple peripheral amplified signal values;

Three superimposed amplification units 30 are used to superimpose and amplify the central amplified signal value and multiple peripheral amplified signal values to obtain the center point enhanced signal value;

The calculation unit 40 is used to calculate the center point enhanced signal value to obtain the center point coordinates.

The above touch system center of gravity signal processing circuit, when the user touches the panel of the control system, collects the signal values of the center point and the center point of the touch area through the signal acquisition unit 10, and then amplifies the center point and the center point of the touch area through the operational amplification unit 20 The signal values around the center point are used to obtain the central amplified signal value and multiple peripheral amplified signal values, and then the central amplified signal value and multiple peripheral amplified signal values are superimposed and amplified through three superimposed amplification units 30 to obtain the central point enhanced signal. value, and finally the calculation unit 40 uses a calculation algorithm to calculate the center point enhanced signal value to obtain accurate center point coordinates.

Please refer to FIG. 2 to FIG. 5 , a touch system center of gravity signal processing circuit provided by a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that in the second embodiment, the signal acquisition unit 10 includes three A signal acquisition circuit 11. Each signal collection circuit 11 includes a touch chip 111 and a touch capacitor 112 connected in series with the touch chip 111, where the touch capacitor 112 is used to obtain voltage changes at the center point of the touch area and around the center point; the touch chip 111, used to obtain the signal value of the center point and the surrounding center point according to the voltage changes at the center point and the surrounding center point of the touch area.

It can be understood that in the embodiment of the present invention, the number of signal collection circuits 11 is three. In other embodiments of the present invention, the number of signal collection circuits 11 may be three or more. Each signal collection circuit Each circuit 11 corresponds to a touch point of the touch panel to collect voltage changes in the user's touch area.

Specifically, in this embodiment, the operational amplifier unit 20 includes three charge amplification circuits 21 , and the charge amplification circuits 21 are connected in series with the corresponding signal acquisition circuit 11 . Specifically, the charge amplification circuit 21 includes an offset compensator 211 and a feedback capacitor 212 connected in series with the offset compensator 211. The offset compensator 211 reduces the error of the signal value collected by the signal acquisition circuit 11. The feedback capacitor 212 amplifies the signal value collected by the signal acquisition circuit 11.

It can be understood that in other embodiments of the present invention, the operational amplifier unit 20 can also be provided with more than three charge amplification circuits 21. Specifically, the number of charge amplification circuits 21 is consistent with the number of signal acquisition circuits 11, and one by one. Corresponding settings.

Specifically, in this embodiment, the superposition amplification unit 30 includes three parallel superposition circuits 31. The superposition circuit 31 includes a first switch 311, a second switch 312, a first capacitor 313, a second capacitor 314, and a third switch 315. , the fourth switch 316, the fifth switch 317, the sixth switch 318, the seventh switch 319 and the eighth switch 320, wherein one end of the first switch 311 is connected to the operational amplifier unit 20 and the second switch 312, and the other end is connected to the third switch 311. One end of the switch 315 and the first capacitor 313 are connected in series, the other end of the third switch 315 is connected to ground, the other end of the first capacitor 313 is connected to one end of the fifth switch 317 and the seventh switch 319, and the other end of the fifth switch 317 is connected to ground. The other end of the seventh switch 319 is connected to the seventh switch 319 of another superposition circuit 31; one end of the second switch 312 is connected to the operational amplifier unit 20 and the first switch 311, and the other end is connected to the fourth switch 316 and the second capacitor 314. One end of the fourth switch 316 is connected to ground, the other end of the second capacitor 314 is connected to one end of the sixth switch 318 and the eighth switch 320 , the other end of the sixth switch 318 is grounded, and the other end of the eighth switch 320 It is connected to the eighth switch 320 of another superposition circuit 31; and in this embodiment, the three superposition circuits 31 in the central superposition amplification unit 30 are respectively connected to the two superposition circuits 31 in the adjacent superposition amplification unit 30. , one end of the superposition amplification unit 30 at the center is connected to the corresponding operational amplifier unit 20, and the other end is connected to the calculation unit 40, so as to collect the signal values collected by the signal acquisition units 10 around the center position through the superposition circuit 31 to the central position. The amplification unit 30 is superimposed, thereby increasing the signal value of the touch point at the center position, so that the calculation result of the calculation unit 40 is more accurate.

Specifically, in the embodiment of the present invention, a holding unit 50 is provided between the calculation unit 40 and the superposition amplification unit 30 to maintain the signal value superimposed by the superposition amplification unit 30, thereby improving the calculation accuracy of the calculation unit 40.

Specifically, in the embodiment of the present invention, the holding unit 50 includes a first amplifier 51, a first holding capacitor 52 and a second holding capacitor 53. The first amplifier 51 includes a first input terminal 511, a second input terminal 512, a first input terminal 512 and a first input terminal 512. The output terminal 513 and the second output terminal 514, the first input terminal 511 is connected to the other terminal of the corresponding seventh switch 319, the second input terminal 512 is connected to the other terminal of the corresponding eighth switch 320, and the first holding capacitor 52 Both ends are electrically connected to the first input terminal 511 and the first output terminal 513 respectively, and the two ends of the second holding capacitor 53 are electrically connected to the second input terminal 512 and the second output terminal 514 respectively, thereby maintaining the superimposed amplification unit 30 the subsequent signal value.

Specifically, in this embodiment, the holding unit 50 further includes a first reset switch 54 and a second reset switch 55 for controlling the discharge of the first holding capacitor 52 and the second holding capacitor 53 respectively.

In one embodiment of the present invention, an electronic device is also provided, including a device body (not shown) and a touch system (not shown) provided in the device body. The touch system includes any of the above. The touch system center signal processing circuit of the item.

In the above-mentioned electronic device, when the user touches the panel of the control system, the signal acquisition unit 10 collects the signal values at the center point and the periphery of the center point of the touch area, and then amplifies the signals at the center point and the periphery of the center point through the operational amplification unit 20 value to obtain the center amplified signal value and multiple peripheral amplified signal values, and then superimpose and amplify the central amplified signal value and multiple peripheral amplified signal values through multiple superimposed amplification units 30 to obtain the center point enhanced signal value, and finally calculate Unit 40 uses a calculation algorithm to calculate the center point enhanced signal value to obtain accurate center point coordinates.

The above embodiments only express several implementation modes of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present invention. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the patent for this invention should be subject to the scope of the patent application.

10: Signal acquisition unit 11: Signal acquisition circuit 111:Touch chip 112:Touch capacitor 20: Operational amplifier unit 21: Charge amplification circuit 211:Offset compensator 212:Feedback capacitor 30: Overlay amplification unit 31: Superposition circuit 311:First switch 312: Second switch 313: First capacitor 314: Second capacitor 315:Third switch 316: The fourth switch 317:Fifth switch 318:Sixth switch 319:Seventh switch 320:The eighth switch 40:Computing unit 50:Hold unit 51:First amplifier 511: first input terminal 512: Second input terminal 513: First output terminal 514: Second output terminal 52: First holding capacitor 53: Second holding capacitor 54:First reset switch 55: Second reset switch

Figure 1 is a module diagram of the center of gravity signal processing circuit of the touch system in the first embodiment of the present invention; Figure 2 is a circuit diagram of the center of gravity signal processing circuit of the touch system in the second embodiment of the present invention; Figure 3 is a circuit diagram of the operational amplifier unit in the center of gravity signal processing circuit of the touch system in Figure 2; Figure 4 is a circuit diagram of the superimposed amplification unit in the center of gravity signal processing circuit of the touch system in Figure 2 FIG. 5 is a circuit diagram of the holding unit in the center-of-gravity signal processing circuit of the touch system in FIG. 2 .

10: Signal acquisition unit

20: Operational amplifier unit

30: Overlay amplification unit

40:Computing unit

Claims (10)

A touch system center of gravity signal processing circuit, including: a signal acquisition unit, an operational amplification unit, a superposition amplification unit and a calculation unit connected in sequence; wherein the signal acquisition unit is used to collect the center point of the touch area and the surroundings of the center point Signal value; the operational amplification unit is used to amplify the signal value at the center point of the touch area and around the center point to obtain a central amplified signal value and multiple peripheral amplified signal values; a plurality of the superposed signals The amplifying unit is used to superimpose and amplify the center amplified signal value and multiple peripheral amplified signal values to obtain a center point enhanced signal value; the calculation unit is used to calculate the center point enhanced signal value to obtain Center point coordinates. The touch system center of gravity signal processing circuit according to claim 1, wherein the signal acquisition unit includes a plurality of signal acquisition circuits. The center of gravity signal processing circuit of the touch system according to claim 2, wherein each signal acquisition circuit includes a touch chip and a touch capacitor connected in series with the touch chip, where the touch capacitor is used to obtain the touch The voltage change at the center point of the touch area and the periphery of the center point; the touch chip is used to obtain the center point and the voltage change at the center point of the touch area based on the voltage changes at the center point and the periphery of the center point. The signal value around the center point. The center-of-gravity signal processing circuit of the touch control system according to claim 1, wherein the operational amplification unit includes a plurality of charge amplification circuits, and each charge amplification circuit is connected in series with the corresponding signal acquisition circuit. The touch system center of gravity signal processing circuit as claimed in claim 4, wherein the charge amplification circuit includes an offset compensator and a feedback capacitor connected in series with the offset compensator. The touch system center of gravity signal processing circuit according to claim 1, wherein the superposition amplification unit includes three parallel superposition circuits, and the superposition circuit includes: a first switch, a second switch, a first capacitor, a second capacitor, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch and an eighth switch; wherein one end of the first switch is connected to the operational amplifier unit and the second switch, and the The other end of the first switch is connected in series with the third switch and one end of the first capacitor, the other end of the third switch is connected to ground, and the other end of the first capacitor is connected with the fifth switch and the third capacitor. One end of the seven switches is connected, the other end of the fifth switch is connected to ground, the other end of the seventh switch is connected to the seventh switch of the other superposition circuit; one end of the second switch is connected to the operation The amplification unit is connected to the first switch, the other end of the second switch is connected to the fourth switch and one end of the second capacitor, the other end of the fourth switch is grounded, and the second capacitor The other end is connected to one end of the sixth switch and the eighth switch, the other end of the sixth switch is grounded, and the other end of the eighth switch is connected to the eighth switch of the other superposition circuit. ; The three superposition circuits in the superposition amplification unit at the center are respectively connected to the two superposition circuits in the adjacent superposition amplification unit, and one end of the superposition amplification unit at the center is connected to the corresponding superposition amplification unit. The operational amplifier unit is connected, and the other end is connected to the computing unit. The center-of-gravity signal processing circuit of the touch system according to claim 6, wherein a holding unit is provided between the calculation unit and the superposition amplification unit. The center of gravity signal processing circuit of the touch system according to claim 7, wherein the holding unit includes: a first amplifier, a first holding capacitor, and a second holding capacitor, and the first amplifier includes a first input terminal, a second holding capacitor, and a first input terminal. An input terminal, a first output terminal and a second output terminal, the first input terminal is connected to the corresponding third The other end of the seven switches, the second input end is connected to the other end of the corresponding eighth switch, and the two ends of the first holding capacitor are electrically connected to the first input end and the first output respectively. terminals, and two terminals of the second holding capacitor are electrically connected to the second input terminal and the second output terminal respectively. The center-of-gravity signal processing circuit of the touch system according to claim 8, wherein the holding unit further includes a first reset switch and a second reset switch for respectively controlling the first holding capacitor and the second Keep the capacitor discharged. An electronic device includes a device body and a touch system provided in the device body, wherein the touch system includes the touch system center of gravity signal processing circuit as described in any one of claims 1 to 9.

Images