CN101533324B - Noise eliminating device of capacitive touch panel and method thereof - Google Patents
Noise eliminating device of capacitive touch panel and method thereof Download PDFInfo
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- CN101533324B CN101533324B CN2008100073647A CN200810007364A CN101533324B CN 101533324 B CN101533324 B CN 101533324B CN 2008100073647 A CN2008100073647 A CN 2008100073647A CN 200810007364 A CN200810007364 A CN 200810007364A CN 101533324 B CN101533324 B CN 101533324B
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Abstract
The invention discloses a noise eliminating device of a capacitive touch panel, and a method thereof, which are used for eliminating the noise generated by a prior filter circuit and an integration circuit or the exterior noise. The invention simplifies the circuit of a prior capacitive touch panel by at least one switch circuit, the filter circuit and the integration circuit are abandoned, while the signal output by a current measurement circuit is simultaneously transmitted to a control unit to execute the calculation of a touch location so as to achieve the purpose of eliminating noise.
Description
Technical field
The present invention relates to a kind of noise elimination apparatus and method thereof, particularly relate to a kind of noise elimination apparatus and method thereof of capacitance type touch-control panel.
Background technology
Traditionally, the input of electronic installation is imported with keyboard and mouse, and can not import with the mode of human intuition.Afterwards; Contact panel has been widely used in all kinds of big compact electronic devices; The mode that this moment, the user was able to the panel of object strikings such as hand or pointer on it is carried out the contact input to this electronic installation; The purpose of reaching this touch-control electronic device of operation is used in the position of set this contact of sensing device senses below the contact panel at this moment.Sensing mechanism with the input of sensing contact is classified, and contact panel can be classified as contact panels such as resistance-type, condenser type, acoustic wave, optical profile type and electromagnetic type; With the kind branch of contact panel, it comprises classification such as contact panel and Trackpad again.
The capacitance type touch-control panel that is the basis with condenser type contact sensing mechanism is an example, and it determines the position that this contact is imported through each the side electric current of sensing one contact input position and the mutual relationship of these electric currents of mat.
See also Fig. 1, it is the explanation synoptic diagram of the contact input position sensing of a conventional condenser contact panel.As shown in Figure 1; One capacitance type touch-control panel 10 is made up of a transparency carrier 11, a conduction plated film 12, an electrode pattern 13 and 14 of rigid coating of insulation basically; Wherein this transparency carrier 11 can be glass; This electrode pattern 13 is formed at the periphery part of this contact panel 10, and the curve distribution that compensates the electric field on this conduction plated film 12 during for work is used.
Please be simultaneously with reference to figure 2, Fig. 2 is the system architecture synoptic diagram of the location determination interlock circuit of existing capacitance type touch-control panel.
Each is connected four corners of this capacitance type touch-control panel 10 with an outer conductor A of company, B, C and D, and respectively receives an interchange sensing signal AC1, AC2, AC3 and AC4 so that the usefulness of the position of measuring the contact P on the capacitance type touch-control panel 10 to be provided.
When real work, these exchange sensing signal AC1, AC2, AC3 and AC4 is identical ac square wave or the string wave voltage signal of amplitude size, and respectively connecting this moment respectively has an electric current I 1, I2, I3 and I4 to pass through on outer conductor A, B, C and the D.Connect outer conductor A, B, C and D current change quantity Δ I1, Δ I2, Δ I3 and the Δ I4 before this contact P occurs and when occurring through measuring each, the coordinate of P position, this contact just can be calculated according to following formula:
x＝(ΔI3+ΔI4-ΔI1-ΔI2)/(ΔI1+ΔI2+ΔI3+ΔI4) (1)，
y＝(ΔI1+ΔI4-ΔI3-ΔI2)/(ΔI1+ΔI2+ΔI3+ΔI4) (2)。
The measuring mode of above-mentioned mentioned current change quantity Δ I1, Δ I2, Δ I3 and Δ I4 is to be implemented in Fig. 2; The metering system of Δ I1 current change quantity is to measure electric current I 1 through current measurement circuit 15; Again measured electric current I 1 of coming out is sent to filtering circuit 16; With noise removing wherein; At last 1 signal of the electric current I behind the integration is sent to a controller 18, carries out the action that analog signal conversion becomes digital signal, calculate Δ I1 current change quantity by the location determination unit 182 that includes in this controller 18 again by the A/D conversion circuit 180 in this controller 18 via integrating circuit 17.By that analogy; Can calculate Δ I2, Δ I3 and Δ I4 respectively through this controller 18; And Δ I1, Δ I2, Δ I3 and Δ I4 calculate with a polling mechanism; And all can share this A/D conversion circuit 180 because of the processing time is different, then through two above-mentioned formula to calculate the coordinate of X axle and Y axle.
Because above-mentioned Δ I1, Δ I2, Δ I3 and Δ I4 calculate with polling mechanism; That is calculate Δ I2 again after calculating Δ I1 earlier; By that analogy; Δ I1, Δ I2, Δ I3 and Δ I4 accomplished calculate, possibly to cause the X axle that calculates and coordinate and the actual position of touch of Y axle be that gap is arranged but this moment is because of the mistiming, noises that perhaps itself produced by above-mentioned filtering circuit 16 and integrating circuit 17 or external noise and cause the situation generation of erroneous judgement.In addition, according to finding out in the diagram of Fig. 2 that this system architecture can cause cost to increase, for example, a plurality of identical current measurement circuit 15, filtering circuit 16 and integrating circuit 17 have been used.
Summary of the invention
Because above-mentioned existing in prior technology problem; The objective of the invention is to propose a kind of noise elimination apparatus and method thereof of capacitance type touch-control panel; It is arranged at X axle and Y axle respectively with at least one on-off circuit, need use and repeats identical circuit to reduce the rear end by this, and receive the measured current signal of on-off circuit that is arranged at X axle and Y axle simultaneously; Carry out the calculating of coordinate position through a control module, so overcome the problem of mistiming and external noise.
To achieve these goals; The present invention proposes a kind of noise elimination apparatus of capacitance type touch-control panel; This capacitance type touch-control panel is a rectangle in fact, and has the sensed layer that a transparency carrier and this transparency carrier similar shape formed and be positioned at the tool electrically conducting transparent characteristic on this transparency carrier, and has 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 is electrically connected at an X side and the 2nd X side respectively;
At least one Y side on-off circuit is electrically connected at a Y side and the 2nd Y side respectively;
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 these X side on-off circuits or these Y side on-off circuit conductings according to these first sensing signals that received or these second sensing signals; And receive at least one X side current signal that these X side on-off circuits are produced simultaneously; Or after at least one Y side current signal of being produced of these Y side on-off circuits carries out suitable computing respectively, with an X coordinate or a Y coordinate of the position of judging a contact.
The noise elimination apparatus of described capacitance type touch-control panel, wherein, these X side on-off circuits and these Y side on-off circuits are a short circuit current.
The noise elimination apparatus of described capacitance type touch-control panel, wherein, this control circuit comprises:
At least one current measurement circuit is used to receive at least one Y side current signal that at least one X side current signal that these X side on-off circuits are produced or these Y side on-off circuits are produced; And
One control module, this control module includes:
At least one A/D conversion circuit; Be used for converting at least one X side form analog signal that these X side current signals are produced at least one X side digital signal, or at least one Y side form analog signal that these Y side current signals are produced converts at least one Y side digital signal to;
One location determination unit carries out suitable computing with these X side digital signals and these Y side digital signals respectively, to obtain this X coordinate or this Y coordinate; And
At least one sample-and-hold circuit; Be arranged at respectively between these current measurement circuits and this control module; Take a sample and keep action to receive these Y side current signals that these X side current signals that these X side on-off circuits are produced or these Y side on-off circuits produced simultaneously, and then eliminate the noise that these X side on-off circuits or these Y side on-off circuits are produced.
The noise elimination apparatus of described capacitance type touch-control panel, wherein, also comprise in this capacitance type touch-control panel one be essentially rectangle the workspace, this contact acts in this screen area.
Another object of the present invention is to also propose a kind of noise elimination apparatus of capacitance type touch-control panel; Noise elimination apparatus in this embodiment adds one first sample-and-hold circuit and one second sample-and-hold circuit, to eliminate the noise that noise, the 2nd X side on-off circuit or the 2nd Y side on-off circuit that an X side on-off circuit or a Y side on-off circuit produced are produced.
To achieve these goals; The present invention proposes a kind of noise elimination apparatus of capacitance type touch-control panel; This capacitance type touch-control panel is a rectangle in fact, and has the sensed layer that a transparency carrier and this transparency carrier similar shape formed and be positioned at the tool electrically conducting transparent characteristic on this transparency carrier, and has 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 current digital signal and the 2nd X side digital current signal simultaneously; After respectively an X side current digital signal and the 2nd X side digital current signal being carried out suitable 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 current digital signal and the 2nd Y side digital current signal simultaneously; After respectively a Y side current digital signal and the 2nd Y side digital current signal being carried out suitable computing, with a Y coordinate of the position of judging a contact.
The noise elimination apparatus of described capacitance type touch-control panel, wherein, 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.
The noise elimination apparatus of described capacitance type touch-control panel, wherein, also comprise in this capacitance type touch-control panel one be essentially rectangle the workspace, this contact acts in this screen area.
Another object of the present invention is to also propose a kind of noise elimination apparatus of capacitance type touch-control panel; An A/D conversion circuit is only used in the control module inside of noise elimination apparatus in this embodiment; And add an electronic switch, so can eliminate the noise that circuit or external environment produce.
To achieve these goals; The present invention proposes a kind of noise elimination apparatus of capacitance type touch-control panel; This capacitance type touch-control panel is a rectangle in fact, and has the sensed layer that a transparency carrier and this transparency carrier similar shape formed and be positioned at the tool electrically conducting transparent characteristic on this transparency carrier, and has 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 current digital signal and the 2nd X side digital current signal, is judged an X coordinate of the position of a contact;
One Y coordinate determinant according to a Y side current digital signal and the 2nd Y side digital current signal, is judged a Y coordinate of the position of a contact.
To achieve these goals; The present invention proposes a kind of noise cancellation method of capacitance type touch-control panel; This capacitance type touch-control panel is a rectangle in fact, and has the sensed layer that a transparency carrier and this transparency carrier similar shape formed and be positioned at the tool electrically conducting transparent characteristic on this transparency carrier, and has 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 this first sensing signal and this 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.
The noise cancellation method of described capacitance type touch-control panel wherein, 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 this 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 this second A/D conversion circuit.
Describe the present invention below in conjunction with accompanying drawing and specific embodiment, but not as to qualification of the present invention.
Description of drawings
Fig. 1 is a kind of three-dimensional exploded view of existing capacitance type touch-control panel;
Fig. 2 is the system architecture synoptic diagram of the location determination interlock circuit of existing capacitance type touch-control panel;
Fig. 3 is the noise elimination apparatus synoptic diagram of capacitance type touch-control panel of the present invention;
Fig. 4 is the noise elimination apparatus synoptic diagram of the capacitance type touch-control panel of first embodiment of the invention;
Fig. 5 is the noise elimination apparatus synoptic diagram of the capacitance type touch-control panel of second embodiment of the invention;
Fig. 6 is the noise elimination apparatus synoptic diagram of the capacitance type touch-control panel of third embodiment of the invention; And
Fig. 7 is the method for eliminating audible noise process flow diagram of capacitance type touch-control panel of the present invention.
Wherein, Reference numeral:
Capacitance type touch-control panel 10
Conduction plated film 12
Integrating circuit 17
A/ D conversion circuit 180,2720
Sensing source 21
The first sensing signal source 210
The second sensing signal source 212
Capacitance type touch-control panel 22
X side on-off circuit 23
Y side on-off circuit 24
The 2nd X side on-off circuit 25
The 2nd Y side on-off circuit 26
First A/D conversion circuit 2740
Second A/D conversion circuit 2742
X coordinate determinant 27440
Y coordinate determinant 27442
A/D conversion circuit 2746
First current measurement circuit 275
Second current measurement circuit 276
First sample-and-hold circuit 277
Second sample-and-hold circuit 278
The one X side on-off circuit 28
The one Y side on-off circuit 29
Contact P
Embodiment
Below in conjunction with accompanying drawing and embodiment technical scheme of the present invention is made further more detailed description.
Please refer to Fig. 3, Fig. 3 is the noise elimination apparatus synoptic diagram of capacitance type touch-control panel of the present invention.As shown in Figure 3; Capacitance type touch-control panel is a rectangle in fact; And has the sensed layer that a transparency carrier and this transparency carrier similar shape formed and be positioned at the tool electrically conducting transparent characteristic on the transparency carrier; And have one the one X side, one the 2nd X side, one the one Y side and one the 2nd Y side, noise elimination apparatus 20 of the present invention comprises sensing source 21, one capacitance type touch-control panel 22, at least one X side on-off circuit 23, at least one Y side on-off circuit 24 and a control circuit 27.
Sensing source 21 comprises one first sensing signal source and one second sensing signal source, and the first sensing signal source and the second sensing signal source produce at least one first sensing signal and at least one second sensing signal respectively.These X side on-off circuits 23 are electrically connected at an X side and the 2nd X side, and these Y side on-off circuits 24 are electrically connected at a Y side and the 2nd Y side.Control circuit 27 receives first sensing signal and second sensing signal; Make X side on-off circuit 23 or 24 conductings of Y side on-off circuit according to first sensing signal or second sensing signal; And receive the X side that X side on-off circuit 23 produced and the current signal of the 2nd X side simultaneously; And the Y side that produced of Y side on-off circuit 24 and the current signal of the 2nd Y side, carry out suitable computing respectively then after, with an X coordinate or a Y coordinate of the position of judging a contact.In a preferred embodiment, X side on-off circuit 23 and Y side on-off circuit 24 can be a short circuit current, and in addition, the first sensing signal source and the second sensing signal source are identical, and first sensing signal and second sensing signal are identical.
Please refer to Fig. 4, Fig. 4 is the noise elimination apparatus synoptic diagram of the capacitance type touch-control panel of first embodiment of the invention.As shown in Figure 4; Capacitance type touch-control panel 22 is a rectangle in fact; Has the sensed layer that a transparency carrier and this transparency carrier similar shape formed and be positioned at the tool electrically conducting transparent characteristic on the transparency carrier; And have one the one X side, one the 2nd X side, one the one Y side and one the 2nd Y side, have a workspace 220, one contact P on the sensed layer of capacitance type touch-control panel 22 and promptly act in the workspace 220.Noise elimination apparatus 20 of the present invention comprises sensing source 21, one the one X side on-off circuits 28, the 2nd X side on-off circuit 25, a Y side on-off circuit 29, the 2nd a Y side on-off circuit 26 and a control circuit 27.
Sensing source 21 comprises one first sensing signal source 210 and 212, the first sensing signal sources 210, one second sensing signal source produce one first sensing signal VS1, and the second sensing signal source 212 produces one second sensing signal VS2.After receiving user compressing on the ad-hoc location of capacitance type touch-control panel 22; And in the workspace 220 generation contact P; Then via the principle of existing capacitance type touch-control panel 22, respectively receive the first sensing signal VS1 and the second sensing signal VS2 usefulness with position that metering contact P is provided at four corners of capacitance type touch-control panel 22.By finding out in the diagram of Fig. 4; When real work; The first sensing signal VS1 respectively has the electric current of I2 and I3 to pass through on an X side; And on the 2nd X side, respectively have the electric current of I1 and I4 to pass through, reaching the second sensing signal VS2 respectively has the electric current of I3 and I4 to pass through on a Y side, and the second sensing signal VS2 respectively has the electric current of I1 and I2 to pass through on the 2nd Y side.
The one X side on-off circuit 28 is electrically connected at an X side, and the 2nd X side on-off circuit 25 is electrically connected at the 2nd X side, and a Y side on-off circuit 29 is electrically connected at a Y side, and the 2nd Y side on-off circuit 26 is electrically connected at the 2nd Y side.
One the one Y side current signal that one the one an X side current signal that first current measurement circuit, 275 receptions the one X side on-off circuit 28 is produced or a Y side on-off circuit 29 are produced, one the 2nd Y side current signal that one the 2nd X side current signal that second current measurement circuit, 276 receptions the 2nd X side on-off circuit 25 is produced or the 2nd Y side on-off circuit 26 are produced.First A/D conversion circuit 2740 is to convert 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 the one one the one Y side form analog signal that produced of Y side current signal convert one the one Y side digital signal to; Second A/D conversion circuit 2742 is to convert 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.
The x of P position, contact and y coordinate figure can be obtained with the following relationship formula that is same as prior art respectively:
X=((I2+I3)-(I1+I4))/I1+I2+I3+I4 (3), and
y＝((I3+I4)-(I1+I2))/I1+I2+I3+I4 (4)。
Wherein above-mentioned (I2+I3) promptly be utilize after an X side on-off circuit 28 conductings calculate; (I1+I4) be utilize after 25 conductings of the 2nd X side on-off circuit calculate; (I3+I4) be utilize after a Y side on-off circuit 29 conductings calculate, and (I1+I2) be utilize after 26 conductings of the 2nd Y side on-off circuit calculate.
The first embodiment difference from prior art has been to use an X side on-off circuit 28, the 2nd X side on-off circuit 25, a Y side on-off circuit 29 and the 2nd Y side on-off circuit 26 to use a plurality of identical circuit in the prior art to reduce; And omit existing filtering circuit and integrating circuit; But with an X side form analog signal of first current measurement circuit 275 and the 2nd X side form analog signal of second current measurement circuit 276; Be directly inputted to first A/D conversion circuit 2740 and second A/D conversion circuit 2742 respectively; And simultaneously an X side current digital signal, the 2nd X side digital current signal, a Y side current digital signal and the 2nd Y side digital current signal are inputed to location determination unit 2744 and do computing, so can eliminate the noise that circuit or external environment produce.
Please refer to Fig. 5, Fig. 5 is the noise elimination apparatus synoptic diagram of the capacitance type touch-control panel of second embodiment of the invention.The function mode of second embodiment is identical with the function mode of above-mentioned first embodiment; Difference only is that second embodiment has added one first sample-and-hold circuit 277 and one second sample-and-hold circuit 278 in addition; First sample-and-hold circuit 277 is arranged between first current measurement circuit 275 and first A/D conversion circuit 2740; 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 28 or a Y side on-off circuit 29 are produced.Second sample-and-hold circuit 278 is arranged between second current measurement circuit 276 and second A/D conversion circuit 2742; 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 25 or the 2nd Y side on-off circuit 26 are produced.
Please refer to Fig. 6, Fig. 6 is the noise elimination apparatus synoptic diagram of the capacitance type touch-control panel of third embodiment of the invention.The function mode of the 3rd embodiment is identical with the function mode of above-mentioned second embodiment, yet compares with second embodiment, and the 3rd embodiment has two differences.An A/D conversion circuit 2746 is only used in control module 274 inside of the first, the three embodiment.Second; Be to have added an electronic switch 279 in addition at the 3rd embodiment; And be arranged between a sample-and-hold circuit 277, second sample-and-hold circuit 278 and the A/D conversion circuit 2746; According to first sensing signal that is received or second sensing signal; Switch to first sample-and-hold circuit 277 or second sample-and-hold circuit 278, 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, electronic switch 279 can be the existing or future various suitable electronic switch of developing.
A/D conversion circuit 2746 receives one the 2nd Y side form analog signal that an X side form analog signal that an X side current signal produced, a 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; Simultaneously an X side current digital signal, the 2nd X side digital current signal, a Y side current digital signal and the 2nd Y side digital current signal are inputed to location determination unit 2744 again and do computing, so can eliminate the noise that circuit or external environment produce.
Please refer to Fig. 7, Fig. 7 is the method for eliminating audible noise process flow diagram of capacitance type touch-control panel of the present invention.Step S100 at first, provides one first sensing signal source 210 and one second sensing signal source 212 to produce at least one first sensing signal VS1 and at least one second sensing signal VS2; Step S102 is sent to an X side and a Y side of capacitance type touch-control panel 22 with the first sensing signal VS1, and the second sensing signal VS2 is sent to the 2nd X side and the 2nd Y side of capacitance type touch-control panel 22; Step S 104, and one the one X side form of obtaining I2 and the I3 electric current summation of an X side through an X side on-off circuit 28 is intended I3 that current signal, a Y side on-off circuit 29 obtain a Y side and one the one Y side form of I4 electric current summation and intended the I1 that I1 that current signal, the 2nd X side on-off circuit 25 obtain the 2nd X side and one the 2nd X side form plan current signal and the 2nd Y side on-off circuit 26 of I4 electric current summation obtain the 2nd Y side and one the 2nd Y side form plan current signal of I2 electric current summation; Step S106 inputs to X side form plan current signal and Y side form plan current signal first current measurement circuit 275 and the 2nd X side form plan current signal and the 2nd Y side form plan current signal is inputed to second current measurement circuit 276; Step S108; Then; An X side form of respectively first current measurement circuit 275 being exported intends current signal and Y side form plan current signal is sent to first A/D conversion circuit 2740, and the 2nd X side form plan current signal and the 2nd Y side form plan current signal that second current measurement circuit 276 is exported is sent to second A/D conversion circuit 2742.
Step S110 intends 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 with an X side form and converts 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 respectively to; Step S112, last, 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 are sent to location determination unit 2744 simultaneously do computing to obtain the x and the y coordinate of P position, contact.
In addition, the deciphering of claim of the present invention in season X and the Y direction on this capacitance type touch-control panel can exchange.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
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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| CN2008100073647A CN101533324B (en) | 2008-03-11 | 2008-03-11 | Noise eliminating device of capacitive touch panel and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102043526B (en) * | 2009-10-09 | 2013-11-06 | 禾瑞亚科技股份有限公司 | Method and device for dual-differential sensing |
| CN102043508B (en) * | 2009-10-09 | 2013-01-02 | 禾瑞亚科技股份有限公司 | Method and device for signal detection |
| CN102231090B (en) * | 2009-10-22 | 2014-03-12 | 群康科技(深圳)有限公司 | Touch display panel and touch display device |
| CN102122222B (en) * | 2010-01-12 | 2013-06-19 | 速博思股份有限公司 | Capacitance type touch control panel device |
| TWI533170B (en) * | 2013-12-09 | 2016-05-11 | 義隆電子股份有限公司 | Electronic device having touch panel and noise detection and operation mode configuration methods thereof |
| JP2015118506A (en) * | 2013-12-18 | 2015-06-25 | シナプティクス・ディスプレイ・デバイス合同会社 | Touch panel control circuit and semiconductor integrated circuit including the same |
| CN106066431B (en) * | 2016-06-30 | 2022-03-01 | 北京集创北方科技股份有限公司 | Noise detection method and device |
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| CN1916712A (en) * | 2006-09-14 | 2007-02-21 | 友达光电股份有限公司 | Touch controlled type liquid crystal display |
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| CN1916712A (en) * | 2006-09-14 | 2007-02-21 | 友达光电股份有限公司 | Touch controlled type liquid crystal display |
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