CN101533324B - Noise elimination device and method for capacitive touch panel - Google Patents

Abstract

The invention discloses a noise elimination device and a method of a capacitance type touch panel, which are used for solving the problem of noise or external noise generated by the existing filter circuit and integrating circuit.

Description

Noise elimination device and method for capacitive touch panel

technical field

The present invention relates to a noise elimination device and a method thereof, in particular to a noise elimination device and a method of a capacitive touch panel. the

Background technique

Traditionally, the input of electronic devices is input by keyboard and mouse, but cannot be input by human intuition. After that, the touch panel has been widely used in various large and small electronic devices. At this time, the user can perform contact input on the electronic device by touching the panel on it with a hand or a stylus. The sensing device arranged under the control panel senses the position of the touch point, so as to achieve the purpose of operating the touch electronic device. According to the classification of the sensing machine for sensing contact input, the touch panel can be classified into resistive, capacitive, acoustic, optical and electromagnetic touch panels; according to the type of touch panel, it also includes Classification of touch panels and touch panels. the

Taking the capacitive touch panel based on the capacitive touch sensing mechanism as an example, it senses the currents on each side of a touch input position and determines the position of the touch input based on the relationship between these currents. the

Please refer to FIG. 1 , which is an explanatory diagram illustrating position sensing of touch input in a conventional capacitive touch panel. As shown in Figure 1, a capacitive touch panel 10 basically consists of a transparent substrate 11, a conductive coating 12, an electrode pattern 13 and an insulating hard coating 14, wherein the transparent substrate 11 can be glass, the electrode The pattern 13 is formed on the peripheral portion of the touch panel 10 for compensating a curve distribution of an electric field on the conductive coating 12 during operation. the

Please refer to FIG. 2 at the same time. FIG. 2 is a schematic diagram of a system architecture of a circuit related to position determination of a conventional capacitive touch panel. the

The four corners of the capacitive touch panel 10 are respectively connected with a connecting outer wire A, B, C and D, and each receives an AC sensing signal AC1, AC2, AC3 and AC4 to provide a measurement of the capacitive touch panel 10 for the position of a contact point P. the

In actual work, these AC sensing signals AC1, AC2, AC3 and AC4 are AC square wave or sine wave voltage signals with the same amplitude. , I2, I3 and I4 pass. By measuring the current variation ΔI1, ΔI2, ΔI3, and ΔI4 of each external conductor A, B, C, and D before and when the contact P appears, the coordinates of the contact P position can be calculated according to the following formula out:

x＝(ΔI3+ΔI4-ΔI1-ΔI2)/(ΔI1+ΔI2+ΔI3+ΔI4) (1),

y=(ΔI1+ΔI4-ΔI3-ΔI2)/(ΔI1+ΔI2+ΔI3+ΔI4) (2). the

The measurement methods of the above-mentioned current variations ΔI1, ΔI2, ΔI3, and ΔI4 are realized in FIG. 2. The measurement method of the ΔI1 current variation is to measure the current I1 through the current measurement circuit 15, and then the measured current I1 is transmitted to the filter circuit 16 to eliminate the noise therein, and finally the integrated current I1 signal is transmitted to a controller 18 through the integration circuit 17, and an analog/digital conversion circuit 180 in the controller 18 performs analog signal conversion Then, the position determination unit 182 included in the controller 18 calculates the amount of current change in ΔI1. By analogy, ΔI2, ΔI3, and ΔI4 can be calculated respectively by the controller 18, and ΔI1, ΔI2, ΔI3, and ΔI4 are calculated by a round-robin mechanism, and all of them can share the analog/digital conversion due to different processing times The circuit 180 then calculates the coordinates of the X-axis and the Y-axis through the above two formulas. the

Since the above ΔI1, ΔI2, ΔI3, and ΔI4 are calculated by polling mechanism, that is, ΔI1 is calculated first and then ΔI2 is calculated, and so on, ΔI1, ΔI2, ΔI3, and ΔI4 are calculated. There is a gap between the calculated X-axis and Y-axis coordinates and the actual touch position, or misjudgment is caused by the noise generated by the filter circuit 16 and the integrating circuit 17 or external noise. In addition, it can be seen from the illustration in FIG. 2 that the system architecture will cause cost increase, for example, multiple identical current measurement circuits 15 , filter circuits 16 and integration circuits 17 are used. the

Contents of the invention

In view of the above-mentioned problems in the prior art, the purpose of the present invention is to provide a noise elimination device and method for a capacitive touch panel, which arranges at least one switch circuit on the X-axis and the Y-axis respectively, so as to Reduce the need to repeat the same circuit at the back end, and simultaneously receive the current signal measured by the switch circuit installed on the X-axis and Y-axis, and calculate the coordinate position through a control unit, so as to overcome the problems of time difference and external noise. the

In order to achieve the above object, the present invention proposes a noise elimination device for a capacitive touch panel. The capacitive touch panel is substantially rectangular, and has a transparent substrate formed in the same shape as the transparent substrate and located on the transparent substrate. A sensing layer with transparent conductive properties, and has a first X side, a second X side, a first Y side and a second Y side, characterized in that the noise elimination device includes:

At least one X-side switch circuit is electrically connected to the first X-side and the second X-side respectively;

At least one Y-side switching circuit is electrically connected to the first Y-side and the second Y-side respectively;

A sensing source, including a first sensing signal source and a second sensing signal source; and

A control circuit, receiving at least one first sensing signal generated by the first sensing signal source and at least one second sensing signal generated by the second sensing signal source, and according to the received first sensing signals The detection signal or these second sensing signals make these X-side switch circuits or these Y-side switch circuits conduct, and at the same time receive at least one X-side current signal generated by these X-side switch circuits, or these Y-side switch circuits. The at least one Y-side current signal is respectively subjected to appropriate calculations to determine an X-coordinate or a Y-coordinate of a position of a contact. the

In the noise elimination device for a capacitive touch panel, the X-side switch circuits and the Y-side switch circuits are a short circuit. the

The noise elimination device of the capacitive touch panel, wherein the control circuit includes:

At least one current measurement circuit for receiving at least one X-side current signal generated by these X-side switch circuits or at least one Y-side current signal generated by these Y-side switch circuits; and

A control unit, the control unit contains:

At least one analog/digital conversion circuit for converting at least one X-side analog signal generated by these X-side current signals into at least one X-side digital signal, or converting at least one Y-side analog signal generated by these Y-side current signals into at least one Y-side digital signal;

A position determination unit, which respectively performs appropriate calculations on these X-side digital signals and these Y-side digital signals to obtain the X coordinate or the Y coordinate; and

At least one sample-and-hold circuit is respectively arranged between the current measurement circuits and the control unit to simultaneously receive the X-side current signals generated by the X-side switch circuits or the Y-side current signals generated by the Y-side switch circuits A sample-and-hold operation is performed to cancel noise generated by these X-side switching circuits or these Y-side switching circuits. the

In the noise elimination device for a capacitive touch panel, the capacitive touch panel also includes a substantially rectangular working area, and the contacts act on the screen area. the

Another object of the present invention is to also provide a noise elimination device for a capacitive touch panel. The noise elimination device in this embodiment adds a first sample-and-hold circuit and a second sample-and-hold circuit to eliminate the first X Noise generated by the switching circuit on the X side or the first switching circuit on the Y side, noise generated by the switching circuit on the second X side or the switching circuit on the second Y side. the

In order to achieve the above object, the present invention proposes a noise elimination device for a capacitive touch panel. The capacitive touch panel is substantially rectangular, and has a transparent substrate formed in the same shape as the transparent substrate and located on the transparent substrate. A sensing layer with transparent conductive properties, and has a first X side, a second X side, a first Y side and a second Y side, characterized in that the noise elimination device includes:

A first X-side switch circuit electrically connected to the first X-side;

A second X-side switch circuit electrically connected to the second X-side;

A first Y-side switch circuit electrically connected to the first Y-side;

A second Y-side switch circuit electrically connected to the second Y-side;

A sensing source, including a first sensing signal source and a second sensing signal source; and

A control circuit receives a first sensing signal generated by the first sensing signal source and a second sensing signal generated by the second sensing signal source, and includes:

A first current measurement circuit, used to receive a first X-side current signal generated by the first X-side switch circuit or a first Y-side current signal generated by the first Y-side switch circuit;

A second current measurement circuit, for receiving a second X-side current signal generated by the second X-side switch circuit or a second Y-side current signal generated by the second Y-side switch circuit;

A control unit, the control unit contains:

A first analog/digital conversion circuit for converting a first X-side analog signal generated by the first X-side current signal into a first X-side digital signal, or a first Y-side current signal generated by a converting the first Y-side analog signal into a first Y-side digital signal; and

A second analog/digital conversion circuit for converting a second X-side analog signal generated by the second X-side current signal into a second X-side digital signal, or a second Y-side current signal generated by a converting the second Y-side analog signal into a second Y-side digital signal; and

A position determination unit is electrically connected to the first analog/digital conversion circuit and the second analog/digital conversion circuit, and includes:

An X-coordinate determiner, which conducts the first X-side switch circuit and the second X-side switch circuit according to the received first sensing signal, and simultaneously receives the first X-side current digital signal and the second X-side current digital signal. X-side digital current signal, after performing appropriate operations on the first X-side current digital signal and the second X-side digital current signal, respectively, to determine an X coordinate of a contact position;

A Y coordinate determiner, according to the received second sensing signal to conduct the first Y-side switch circuit and the second Y-side switch circuit, and simultaneously receive the first Y-side current digital signal and the second Y-side current digital signal For the Y-side digital current signal, the first Y-side current digital signal and the second Y-side digital current signal are properly calculated to determine a Y-coordinate of a contact position. the

The noise elimination device of the capacitive touch panel, wherein the control circuit also includes:

A first sample and hold circuit, arranged between the first current measurement circuit and the first analog/digital conversion circuit, to simultaneously receive the first X-side current signal or the first Y-side current signal for signal sampling and holding action, thereby eliminating the noise generated by the first X-side switch circuit or the first Y-side switch circuit; and

A second sample-and-hold circuit, arranged between the second current measurement circuit and the second analog/digital conversion circuit, to simultaneously receive the second X-side current signal or the second Y-side current signal for signal sampling and holding action, thereby eliminating the noise generated by the second X-side switch circuit or the second Y-side switch circuit. the

In the noise elimination device for a capacitive touch panel, the capacitive touch panel also includes a substantially rectangular working area, and the contacts act on the screen area. the

Another object of the present invention is to also provide a noise elimination device for a capacitive touch panel. In this embodiment, only one analog/digital conversion circuit is used inside the control unit of the noise elimination device, and an electronic switch is added, This eliminates noise generated by the circuit or the external environment. the

In order to achieve the above object, the present invention proposes a noise elimination device for a capacitive touch panel. The capacitive touch panel is substantially rectangular, and has a transparent substrate formed in the same shape as the transparent substrate and located on the transparent substrate. A sensing layer with transparent conductive properties, and has a first X side, a second X side, a first Y side and a second Y side, characterized in that the noise elimination device includes:

A first X-side switch circuit electrically connected to the first X-side;

A second X-side switch circuit electrically connected to the second X-side;

A first Y-side switch circuit electrically connected to the first Y-side;

A second Y-side switch circuit electrically connected to the second Y-side;

A sensing source, including a first sensing signal source and a second sensing signal source; and

A control circuit receives a first sensing signal generated by the first sensing signal source and a second sensing signal generated by the second sensing signal source, and includes:

A first current measurement circuit, used to receive a first X-side current signal generated by the first X-side switch circuit or a first Y-side current signal generated by the first Y-side switch circuit;

A second current measurement circuit, for receiving a second X-side current signal generated by the second X-side switch circuit or a second Y-side current signal generated by the second Y-side switch circuit;

A first sample-and-hold circuit, electrically connected to the first current measurement circuit, to simultaneously receive the first X-side current signal or the first Y-side current signal to perform a signal sample-and-hold operation, thereby eliminating the first X-side current signal Noise generated by the switching circuit or the first Y-side switching circuit;

A second sample-and-hold circuit, arranged between the first current measurement circuit and the second analog/digital conversion circuit, to simultaneously receive the second X-side current signal or the second Y-side current signal for signal sampling and hold action, thereby eliminating the noise generated by the second X-side switch circuit or the second Y-side switch circuit;

An electronic switch, electrically connected to the first sample and hold circuit and the second sample and hold circuit, switches to the first sample and hold circuit or the second sample and hold circuit according to the received first sensing signal or the second sensing signal The second sample-and-hold circuit to obtain the first X-side current signal and the first Y-side current signal or the second X-side current signal and the second Y-side current signal;

A control unit, the control unit contains:

An analog/digital conversion circuit, electrically connected to the electronic switch, for receiving a first X-side analog signal generated by the first X-side current signal and a first X-side analog signal generated by the first Y-side current signal. The Y-side analog signal, a second X-side analog signal generated by the second X-side current signal, and a second Y-side analog signal generated by the second Y-side current signal are respectively converted into a first X-side digital signal, a second X-side digital signal, a first Y-side digital signal, and a second Y-side digital signal; and

A position determination unit is electrically connected to the analog/digital conversion circuit and includes:

An X-coordinate determiner, based on the first X-side current digital signal and the second X-side digital current signal, determines an X-coordinate of a contact position;

A Y-coordinate determiner determines a Y-coordinate of a contact position according to the first Y-side current digital signal and the second Y-side digital current signal. the

In order to achieve the above object, the present invention proposes a method for eliminating noise of a capacitive touch panel. The capacitive touch panel is substantially rectangular, and has a transparent substrate formed in the same shape as the transparent substrate and located on the transparent substrate. A sensing layer with transparent conductive properties, and has a first X side, a second X side, a first Y side and a second Y side, characterized in that the noise elimination method comprises the following steps:

providing a first sensing signal source and a second sensing signal source;

Respectively transmit the first sensing signal and the second sensing signal to the first X side, first Y side, second X side and second Y side;

obtaining a first X-side analog current signal, a first Y-side analog current signal, a second X-side analog current signal, and a second Y-side analog current signal;

converting the first X-side analog current signal, the first Y-side analog current signal, the second X-side analog current signal, and the second Y-side analog current signal to a first X-side digital current signal, a first Y-side digital current signal, a second X-side digital current signal and a second Y-side digital current signal; and

Simultaneously transmit the first X-side digital current signal, the first Y-side digital current signal, the second X-side digital current signal and the second Y-side digital current signal to a position determination unit for calculation to obtain a contact position An x and a y coordinate of . the

The noise elimination method of the capacitive touch panel, which also includes:

Inputting the first X-side analog current signal and the first Y-side analog current signal to a first current measurement circuit and the second X-side analog current signal and the second Y-side analog current signal to a second current measurement circuit the steps of the circuit; and

The first X-side analog current signal and the first Y-side analog current signal output by the first current measurement circuit are respectively transmitted to the first analog/digital conversion circuit, and the output of the second current measurement circuit is A step of transmitting the second X-side analog current signal and the second Y-side analog current signal to the second analog/digital conversion circuit. the

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention. the

Description of drawings

Fig. 1 is a three-dimensional exploded view of an existing capacitive touch panel;

FIG. 2 is a schematic diagram of the system architecture of the position determination related circuit of the existing capacitive touch panel;

Fig. 3 is the schematic diagram of the noise elimination device of the capacitive touch panel of the present invention;

4 is a schematic diagram of a noise elimination device for a capacitive touch panel according to a first embodiment of the present invention;

5 is a schematic diagram of a noise elimination device for a capacitive touch panel according to a second embodiment of the present invention;

6 is a schematic diagram of a noise elimination device for a capacitive touch panel according to a third embodiment of the present invention; and

FIG. 7 is a flow chart of a noise elimination method for a capacitive touch panel of the present invention. the

Among them, reference signs:

Capacitive touch panel 10

Transparent Substrates 11

Conductive Coating 12

Electrode pattern 13

Insulation Hard Plating 14

Current measurement circuit 15

Filter circuit 16

Integrator Circuit 17

Controller 18

Analog/digital conversion circuit 180, 2720

Position determination unit 182, 2722

Noise Cancellation Device 20

Sensing source 21

The first sensing signal source 210

The second sensing signal source 212

Capacitive touch panel 22

Work area 220

X side switch circuit 23

Y side switch circuit 24

The second X-side switch circuit 25

Second Y side switch circuit 26

Control Circuit 27

Current measurement circuit 270

Control unit 272

Control unit 274

The first analog/digital conversion circuit 2740

The second analog/digital conversion circuit 2742

Position Judgment Unit 2744

X coordinate determiner 27440

Y coordinate determiner 27442

Analog/digital conversion circuit 2746

The first current measurement circuit 275

Second current measurement circuit 276

The first sample and hold circuit 277

The second sample and hold circuit 278

Electronic toggle switch 279

First X side switch circuit 28

The first Y side switch circuit 29

Contact P

Detailed ways

The technical solutions of the present invention will be further described in more detail in conjunction with the accompanying drawings and specific embodiments. the

Please refer to FIG. 3 , which is a schematic diagram of a noise elimination device for a capacitive touch panel of the present invention. As shown in FIG. 3 , the capacitive touch panel is substantially rectangular, and has a transparent substrate conformally formed with the transparent substrate and a sensing layer with transparent conductive properties located on the transparent substrate, and has a first X side , a second X side, a first Y side and a second Y side, the noise elimination device 20 of the present invention includes a sensing source 21, a capacitive touch panel 22, at least one X side switch circuit 23, at least A Y-side switch circuit 24 and a control circuit 27 . the

The sensing source 21 includes a first sensing signal source and a second sensing signal source, the first sensing signal source and the second sensing signal source respectively generate at least one first sensing signal and at least one second sensing signal Signal. The X-side switch circuits 23 are electrically connected to the first X-side and the second X-side, and the Y-side switch circuits 24 are electrically connected to the first Y-side and the second Y-side. The control circuit 27 receives the first sensing signal and the second sensing signal, makes the X-side switch circuit 23 or the Y-side switch circuit 24 conduct according to the first sensing signal or the second sensing signal, and simultaneously receives the X-side switch circuit The current signals of the first X side and the second X side generated by 23, and the current signals of the first Y side and the second Y side generated by the Y side switch circuit 24, and then perform appropriate calculations respectively to determine a An X-coordinate or a Y-coordinate of the location of the touch point. In a preferred embodiment, the X-side switch circuit 23 and the Y-side switch circuit 24 can be a short-circuit circuit. In addition, the first sensing signal source and the second sensing signal source are the same, and the first sensing signal and the second sensing signal source The two sensing signals are the same. the

The control circuit 27 further includes at least one current measurement circuit 270 and a control unit 272. The current measurement circuit 270 is used for receiving the X-side current signal or the Y-side current signal. The control unit 272 also includes at least one analog/digital conversion circuit 2720 and a position determination unit 2722. The analog/digital conversion circuit 2720 is used to convert the first X side and the second X side current signals generated by the first X side and the second X side. Convert the analog signal on the X side to the digital signal on the first X side and the second X side, or convert the analog signal on the first Y side and the second Y side generated by the current signal on the first Y side and the second Y side into digital signals on the first Y side and the second Y side. The position determination unit 2722 performs appropriate calculations on the X-side digital signal and the Y-side digital signal to obtain an X coordinate or a Y coordinate. the

Please refer to FIG. 4 , which is a schematic diagram of a noise elimination device for a capacitive touch panel according to a first embodiment of the present invention. As shown in FIG. 4 , the capacitive touch panel 22 is substantially rectangular, has a transparent substrate conformally formed with the transparent substrate and is located on the transparent substrate with a transparent conductive sensing layer, and has a first X side , a second X side, a first Y side and a second Y side, the sensing layer of the capacitive touch panel 22 has a working area 220 , and a contact P acts on the working area 220 . The noise canceling device 20 of the present invention comprises a sensing source 21, a first X-side switch circuit 28, a second X-side switch circuit 25, a first Y-side switch circuit 29, a second Y-side switch circuit 26 and A control circuit 27 . the

The sensing source 21 includes a first sensing signal source 210 and a second sensing signal source 212, the first sensing signal source 210 generates a first sensing signal VS1, and the second sensing signal source 212 generates a second sensing signal source 212. Sense signal VS2. When a specific position of the capacitive touch panel 22 is pressed by a user, and a contact point P is generated in the working area 220, then through the existing principle of the capacitive touch panel 22, the capacitive touch panel 22 Each of the four corners receives the first sensing signal VS1 and the second sensing signal VS2 for measuring the position of the contact point P. FIG. It can be seen from the illustration in FIG. 4 that in actual operation, the first sensing signal VS1 has currents of I2 and I3 on the first X side, and currents of I1 and I4 on the second X side. The current passes, and the second sensing signal VS2 has currents of I3 and I4 respectively passing on the first Y side, and the second sensing signal VS2 has currents of I1 and I2 passing on the second Y side. the

The first X side switch circuit 28 is electrically connected to the first X side, the second X side switch circuit 25 is electrically connected to the second X side, and the first Y side switch circuit 29 is electrically connected to the first Y side. The second Y-side switch circuit 26 is electrically connected to the second Y-side. the

The control circuit 27 includes a first current measurement circuit 275 , a second current measurement circuit 276 and a control unit 274 . The control unit 274 also includes a first analog/digital conversion circuit 2740 , a second analog/digital conversion circuit 2742 and a position determination unit 2744 . The position determination unit 2744 also includes an X coordinate determiner 27440 and a Y coordinate determiner 27442. the

The first current measurement circuit 275 receives a first X-side current signal generated by the first X-side switch circuit 28 or a first Y-side current signal generated by the first Y-side switch circuit 29, and the second current measurement circuit 276 receives A second X-side current signal generated by the second X-side switch circuit 25 or a second Y-side current signal generated by the second Y-side switch circuit 26 . The first analog/digital conversion circuit 2740 converts a first X-side analog signal generated by the first X-side current signal into a first X-side digital signal, or a first Y-side generated by the first Y-side current signal. The analog signal is converted into a first Y-side digital signal, and the second analog/digital conversion circuit 2742 converts a second X-side analog signal generated by the second X-side current signal into a second X-side digital signal, or the first A second Y-side analog signal generated by the two Y-side current signals is converted into a second Y-side digital signal. the

The position determination unit 2744 is electrically connected to the first analog/digital conversion circuit 2740 and the second analog/digital conversion circuit 2742, and the X-coordinate determination unit 27440 turns on the X-side switch circuit 28 and the X-side switch circuit 28 according to the received first sensing signal. The second X-side switch circuit 25 receives the first X-side current digital signal and the second X-side digital current signal at the same time, and respectively performs appropriate calculations on the first X-side current digital signal and the second X-side digital current signal, To determine an X coordinate of the position of the contact point P, the Y coordinate determiner 27442 conducts the first Y-side switch circuit 29 and the second Y-side switch circuit 26 according to the received second sensing signal, and simultaneously receives the first Y-side switch circuit 29 and the second Y-side switch circuit 26. A Y-side current digital signal and a second Y-side digital current signal are respectively subjected to appropriate calculations on the first Y-side current digital signal and the second Y-side digital current signal to determine a Y-coordinate of the position of the contact P. the

The x and y coordinate values of the contact point P position can be obtained respectively with the following relational formula same as the prior art:

x=((I2+I3)-(I1+I4))/I1+I2+I3+I4 (3), and

y=((I3+I4)-(I1+I2))/I1+I2+I3+I4 (4). the

Wherein the above-mentioned (I2+I3) is calculated after the first X-side switch circuit 28 is turned on, (I1+I4) is calculated after the second X-side switch circuit 25 is turned on, (I3 +I4) is calculated using the first Y-side switch circuit 29 turned on, and (I1+I2) is calculated using the second Y-side switch circuit 26 turned on. the

The first embodiment differs from the prior art in that a first X-side switch circuit 28, a second X-side switch circuit 25, a first Y-side switch circuit 29, and a second Y-side switch circuit 26 are used to reduce the number of conventional X-side switch circuits. Using a plurality of identical circuits, and omitting the existing filter circuit and integration circuit, but the first X-side analog signal of the first current measurement circuit 275 and the second X-side analog signal of the second current measurement circuit 276, They are respectively directly input to the first analog/digital conversion circuit 2740 and the second analog/digital conversion circuit 2742, and at the same time, the first X-side current digital signal, the second X-side digital current signal, the first Y-side current digital signal and the second The two Y-side digital current signals are input to the position determination unit 2744 for calculation, so that noise generated by the circuit or the external environment can be eliminated. the

Please refer to FIG. 5 , which is a schematic diagram of a noise elimination device for a capacitive touch panel according to a second embodiment of the present invention. The mode of operation of the second embodiment is the same as that of the above-mentioned first embodiment, the only difference is that the second embodiment adds a first sample and hold circuit 277 and a second sample and hold circuit 278, the first sample and hold The circuit 277 is arranged between the first current measurement circuit 275 and the first analog/digital conversion circuit 2740 to simultaneously receive the first X-side current signal or the first Y-side current signal to perform a signal sampling and holding operation, thereby eliminating the first X Noise generated by the side switch circuit 28 or the first Y side switch circuit 29. The second sample-and-hold circuit 278 is arranged between the second current measurement circuit 276 and the second analog/digital conversion circuit 2742 to simultaneously receive the second X-side current signal or the second Y-side current signal to perform a signal sample-and-hold operation, and then Noise generated by the second X-side switch circuit 25 or the second Y-side switch circuit 26 is eliminated. the

Please refer to FIG. 6 , which is a schematic diagram of a noise elimination device for a capacitive touch panel according to a third embodiment of the present invention. The operation of the third embodiment is the same as that of the above-mentioned second embodiment, but compared with the second embodiment, the third embodiment has two differences. First, only one analog/digital conversion circuit 2746 is used inside the control unit 274 of the third embodiment. Second, an electronic switch 279 is additionally added to the third embodiment, and it is arranged between a sample-and-hold circuit 277, a second sample-and-hold circuit 278, and an analog/digital conversion circuit 2746. The detection signal or the second sensing signal is switched to the first sample-and-hold circuit 277 or the second sample-and-hold circuit 278 to obtain the first X-side current signal and the first Y-side current signal or the second X-side current signal and the second For the Y-side current signal, the electronic switch 279 can be various applicable electronic switches that are currently or will be developed in the future. the

The analog/digital conversion circuit 2746 receives a first X-side analog signal generated by the first X-side current signal, a first Y-side analog signal generated by the first Y-side current signal, and a first Y-side analog signal generated by the second X-side current signal. A second Y-side analog signal generated by two X-side analog signals and a second Y-side current signal is converted into a first X-side digital signal, a second X-side digital signal, a first Y-side digital signal and A second Y-side digital signal, and simultaneously input the first X-side current digital signal, the second X-side digital current signal, the first Y-side current digital signal and the second Y-side digital current signal to the position determination unit 2744 for calculation , so that noise generated by the circuit or the external environment can be eliminated. the

Please refer to FIG. 7 . FIG. 7 is a flowchart of a noise elimination method for a capacitive touch panel of the present invention. Step S100, first, provide a first sensing signal source 210 and a second sensing signal source 212 to generate at least one first sensing signal VS1 and at least one second sensing signal VS2; The sensing signal VS1 is transmitted to the first X side and the first Y side of the capacitive touch panel 22, and the second sensing signal VS2 is transmitted to the second X side and the second Y side of the capacitive touch panel 22; step S 104, obtain a first X side analog current signal of the I2 and I3 current sum of the first X side through the first X side switch circuit 28, and obtain the I3 and I4 current sum of the first Y side by the first Y side switch circuit 29 A first Y-side analog current signal, the second X-side switch circuit 25 obtains a second X-side analog current signal of the sum of the I1 and I4 currents of the second X-side, and the second Y-side switch circuit 26 obtains the second Y-side A second Y-side analog current signal of the sum of the I1 and I2 currents; step S106, input the first X-side analog current signal and the first Y-side analog current signal to the first current measurement circuit 275 and the second X-side analog current signal The current signal and the second Y-side analog current signal are input to the second current measurement circuit 276; step S108, then, the first X-side analog current signal and the first Y-side analog current signal output by the first current measurement circuit 275 are respectively Send to the first analog/digital conversion circuit 2740 , and send the second X-side analog current signal and the second Y-side analog current signal output by the second current measurement circuit 276 to the second analog/digital conversion circuit 2742 . the

Step S110, converting the first X-side analog current signal, the first Y-side analog current signal, the second X-side analog current signal, and the second Y-side analog current signal into the first X-side digital current signal, the first Y-side The digital current signal, the second X-side digital current signal and the second Y-side digital current signal; step S112, finally, the first X-side digital current signal, the first Y-side digital current signal, the second X-side digital current signal and The second Y-side digital current signal is simultaneously sent to the position determination unit 2744 for calculation to obtain the x and y coordinates of the position of the contact P. the

In addition, the interpretation of the patent scope of the present invention should be that the X and Y directions on the capacitive touch panel can be reversed. the

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention. the

Claims (10)

1. the noise elimination apparatus of a capacitance type touch-control panel; This capacitance type touch-control panel is a rectangle; And have a transparency carrier and form and be positioned at the sensed layer of the tool electrically conducting transparent characteristic on this transparency carrier with this transparency carrier similar shape; And have one the one X side, one the 2nd X side, one the one Y side and one the 2nd Y side, it is characterized in that this noise elimination apparatus comprises:

At least one X side on-off circuit, each X side on-off circuit be electrically connected at an X side and the 2nd X side at least one of them;

At least one Y side on-off circuit, each Y side on-off circuit be electrically connected at a Y side and the 2nd Y side at least one of them;

One sensing source comprises one first sensing signal source and one second sensing signal source; And

One control circuit; Receive at least one second sensing signal that at least one first sensing signal that this first sensing signal source produced and this second sensing signal source are produced; And make said at least one X side on-off circuit or the conducting of said at least one Y side on-off circuit according to said first sensing signal that is received or said second sensing signal; And receive the X side that said at least one X side on-off circuit produced and the current signal of the 2nd X side simultaneously; Or after the current signal of the Y side that produced of said at least one Y side on-off circuit and the 2nd Y side carries out computing respectively, with an X coordinate or a Y coordinate of the position of judging a contact.

2. the noise elimination apparatus of capacitance type touch-control panel according to claim 1 is characterized in that, said at least one X side on-off circuit and said at least one Y side on-off circuit are a short circuit current.

3. the noise elimination apparatus of capacitance type touch-control panel according to claim 1 is characterized in that, this control circuit comprises:

At least one current measurement circuit is used to receive the current signal of X side that said at least one X side on-off circuit produced and the 2nd X side or a Y side that said at least one Y side on-off circuit is produced and the current signal of the 2nd Y side; And

One control module, this control module includes:

At least one A/D conversion circuit; Be used for the analog signal conversion of the X side that current signal produced of an X side and the 2nd X side and the 2nd X side is become the digital signal of an X side and the 2nd X side, or the analog signal conversion of the Y side that current signal produced of a Y side and the 2nd Y side and the 2nd Y side becomes the digital signal of a Y side and the 2nd Y side;

One location determination unit carries out computing with the digital signal of an X side and the 2nd X side and the digital signal of a Y side and the 2nd Y side respectively, to obtain this X coordinate or this Y coordinate; And

At least one sample-and-hold circuit; Be arranged at respectively between said at least one current measurement circuit and this control module; Taking a sample with the current signal of the current signal that receives X side that said at least one X side on-off circuit produced and the 2nd X side simultaneously or Y side that said at least one Y side on-off circuit is produced and the 2nd Y side keeps action, and then eliminates the noise that said at least one X side on-off circuit or said at least one Y side on-off circuit are produced.

4. the noise elimination apparatus of capacitance type touch-control panel according to claim 1 is characterized in that, also comprises one in this capacitance type touch-control panel and is the workspace of rectangle, and this contact acts in the screen area.

5. the noise elimination apparatus of a capacitance type touch-control panel; This capacitance type touch-control panel is a rectangle; And have a transparency carrier and form and be positioned at the sensed layer of the tool electrically conducting transparent characteristic on this transparency carrier with this transparency carrier similar shape; And have one the one X side, one the 2nd X side, one the one Y side and one the 2nd Y side, it is characterized in that this noise elimination apparatus comprises:

One the one X side on-off circuit is electrically connected at an X side;

One the 2nd X side on-off circuit is electrically connected at the 2nd X side;

One the one Y side on-off circuit is electrically connected at a Y side;

One the 2nd Y side on-off circuit is electrically connected at the 2nd Y side;

One sensing source comprises one first sensing signal source and one second sensing signal source; And

One control circuit receives one second sensing signal that one first sensing signal that this first sensing signal source produced and this second sensing signal source are produced, and comprises:

One first current measurement circuit is used to receive one the one Y side current signal that one the one an X side current signal that an X side on-off circuit produced or a Y side on-off circuit are produced;

One second current measurement circuit is used to receive one the 2nd Y side current signal that one the 2nd X side current signal that the 2nd X side on-off circuit produced or the 2nd Y side on-off circuit are produced;

One control module, this control module includes:

One first A/D conversion circuit; Be used for converting one the one X side form analog signal that an X side current signal is produced to one the one X side digital signal, or one the one Y side form analog signal that a Y side current signal is produced converts one the one Y side digital signal to; And

One second A/D conversion circuit; Be used for converting one the 2nd X side form analog signal that the 2nd X side current signal is produced to one the 2nd X side digital signal, or one the 2nd Y side form analog signal that the 2nd Y side current signal is produced converts one the 2nd Y side digital signal to; And

One location determination unit is electrically connected at this first A/D conversion circuit and this second A/D conversion circuit, and comprises:

One X coordinate determinant; According to this first sensing signal that is received with conducting the one X side on-off circuit and the 2nd X side on-off circuit; And receive an X side digital signal and the 2nd X side digital signal simultaneously; Respectively an X side digital signal and the 2nd X side digital signal are carried out computing, with an X coordinate of the position of judging a contact;

One Y coordinate determinant; According to this second sensing signal that is received with conducting the one Y side on-off circuit and the 2nd Y side on-off circuit; And receive a Y side digital signal and the 2nd Y side digital signal simultaneously; Respectively a Y side digital signal and the 2nd Y side digital signal are carried out computing, with a Y coordinate of the position of judging a contact.

6. the noise elimination apparatus of capacitance type touch-control panel according to claim 5 is characterized in that, this control circuit also comprises:

One first sample-and-hold circuit; Be arranged between this first current measurement circuit and this first A/D conversion circuit; Keep action to receive an X side current signal or a Y side current signal simultaneously to carry out sample of signal, and then eliminate the noise that an X side on-off circuit or a Y side on-off circuit are produced; And

One second sample-and-hold circuit; Be arranged between this second current measurement circuit and this second A/D conversion circuit; Keep action to receive the 2nd X side current signal or the 2nd Y side current signal simultaneously to carry out sample of signal, and then eliminate the noise that the 2nd X side on-off circuit or the 2nd Y side on-off circuit are produced.

7. the noise elimination apparatus of capacitance type touch-control panel according to claim 5 is characterized in that, also comprises one in this capacitance type touch-control panel and is the workspace of rectangle, and this contact acts in the screen area.

8. the noise elimination apparatus of a capacitance type touch-control panel; This capacitance type touch-control panel is a rectangle; And have a transparency carrier and form and be positioned at the sensed layer of the tool electrically conducting transparent characteristic on this transparency carrier with this transparency carrier similar shape; And have one the one X side, one the 2nd X side, one the one Y side and one the 2nd Y side, it is characterized in that this noise elimination apparatus comprises:

One the one X side on-off circuit is electrically connected at an X side;

One the 2nd X side on-off circuit is electrically connected at the 2nd X side;

One the one Y side on-off circuit is electrically connected at a Y side;

One the 2nd Y side on-off circuit is electrically connected at the 2nd Y side;

One sensing source comprises one first sensing signal source and one second sensing signal source; And

One control circuit receives one second sensing signal that one first sensing signal that this first sensing signal source produced and this second sensing signal source are produced, and comprises:

One first current measurement circuit is used to receive one the one Y side current signal that one the one an X side current signal that an X side on-off circuit produced or a Y side on-off circuit are produced;

One second current measurement circuit is used to receive one the 2nd Y side current signal that one the 2nd X side current signal that the 2nd X side on-off circuit produced or the 2nd Y side on-off circuit are produced;

One first sample-and-hold circuit; Be electrically connected at this first current measurement circuit; Keep action to receive an X side current signal or a Y side current signal simultaneously to carry out sample of signal, and then eliminate the noise that an X side on-off circuit or a Y side on-off circuit are produced;

One second sample-and-hold circuit; Be arranged between this first current measurement circuit and this second A/D conversion circuit; Keep action to receive the 2nd X side current signal or the 2nd Y side current signal simultaneously to carry out sample of signal, and then eliminate the noise that the 2nd X side on-off circuit or the 2nd Y side on-off circuit are produced;

One electronic switch; Be electrically connected at this first sample-and-hold circuit and this second sample-and-hold circuit; According to this first sensing signal that is received or this second sensing signal; Switch to this first sample-and-hold circuit or this second sample-and-hold circuit, to obtain an X side current signal and a Y side current signal or the 2nd X side current signal and the 2nd Y side current signal;

One control module, this control module includes:

One A/D conversion circuit; Be electrically connected at this electronic switch; Be used to receive one the 2nd Y side form analog signal that one the one X side form analog signal that an X side current signal produced, one the one Y side form analog signal that a Y side current signal is produced, one the 2nd X side form analog signal that the 2nd X side current signal is produced and the 2nd Y side current signal are produced, and convert one the one X side digital signal, one the 2nd X side digital signal, one the one Y side digital signal and one the 2nd Y side digital signal respectively to; And

One location determination unit is electrically connected at this A/D conversion circuit, and comprises:

One X coordinate determinant according to an X side digital signal and the 2nd X side digital signal, is judged an X coordinate of the position of a contact;

One Y coordinate determinant according to a Y side digital signal and the 2nd Y side digital signal, is judged a Y coordinate of the position of a contact.

9. the noise cancellation method of a capacitance type touch-control panel; This capacitance type touch-control panel is a rectangle; And have a transparency carrier and form and be positioned at the sensed layer of the tool electrically conducting transparent characteristic on this transparency carrier with this transparency carrier similar shape; And have one the one X side, one the 2nd X side, one the one Y side and one the 2nd Y side, it is characterized in that this method of eliminating audible noise comprises the following step:

One first sensing signal source and one second sensing signal source are provided;

Transmit first sensing signal and second sensing signal to an X side, a Y side, the 2nd X side and the 2nd Y side respectively;

Obtain one the one X side form and intend current signal, one the one Y side form plan current signal, one the 2nd X side form plan current signal and one the 2nd Y side form plan current signal;

Change an X side form respectively and intend current signal, Y side form plan current signal, the 2nd X side form plan current signal and the 2nd Y side form plan current signal to an X side digital current signal, one the one Y side digital current signal, one the 2nd X side digital current signal and one the 2nd Y side digital current signal; And

Transmit an X side digital current signal, a Y side digital current signal, the 2nd X side digital current signal and the 2nd Y side digital current signal to location determination unit simultaneously and make an x and the y coordinate of computing to obtain a contact position.

10. the noise cancellation method of capacitance type touch-control panel according to claim 9 is characterized in that, also comprises:

Import an X side form plan current signal and a Y side form and intend the step that current signal inputs to one first current measurement circuit and the 2nd X side form plan current signal and the 2nd Y side form plan current signal to one second current measurement circuit; And

An X side form of respectively this first current measurement circuit being exported intends current signal and Y side form plan current signal is sent to first A/D conversion circuit and the 2nd X side form plan current signal and the 2nd Y side form that this second current measurement circuit is exported are intended the step that current signal is sent to second A/D conversion circuit.

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