CN102193694B - Electronics for Compensating Capacitance Deviations - Google Patents

Abstract

The electronic device includes: a touch input device; a touch sensing circuit coupled to the touch input device; and a capacitance deviation compensation circuit. The capacitance deviation compensation circuit includes: the first offset compensation capacitor array is coupled to a reference voltage or a driving signal in response to a control signal of the touch sensing circuit, coupled to one of a first coupling voltage and a second coupling voltage of the touch input device in response to the control signal, and adjusted to an output equivalent capacitance value in response to the control signal so as to compensate at least one of a GND parasitic capacitor and a cross coupling capacitor of the touch input device.

Description

The electronic installation of building-out capacitor deviation

Technical field

But the present invention relates to a kind of electronic installation of building-out capacitor deviation.

Background technology

At present, developed the touch switch.The touch switch for example is capacitance-type switch etc.For ease of use, the contact panel of having developed at present (touch panel) or demonstration contact panel (having the function that shows with touch-control simultaneously), it can be imported, click etc. by the user, and it can be applicable in the middle of the various electronic installations, for example in the mobile phone.So, can allow the user directly at contact panel or show the contact panel input or click picture, so that the operator scheme of convenient and hommization to be provided.Contact panel or demonstration contact panel have multiple, and capacitance type touch-control panel, condenser type show that contact panel belongs to wherein.

When user's operating capacitance touch panel, when condenser type shows contact panel or capacitance-type switch, the capacitance of the testing capacitance that it is inner can change with user's operation.So, if can survey capacitance and its variation of testing capacitance, i.e. detectable (sensation) user's operation.The positioning principle of capacitance type touch-control panel is to utilize the changes in capacitance that is embedded in the induction grid in the contact panel to judge the position of contact point.

Fig. 1 shows the synoptic diagram of thecontact panel 10 of prior art.Please refer to Fig. 1,contact panel 10 comprises that (X1～Xm) (Y1～Yn), m and n are positive integer to many directions X leads, and m can equate with n or be unequal with many Y-direction leads.Directions X lead and Y-direction lead are embedded in different layers.Directions X lead and Y-direction lead are staggered, to form the induction grid.Can form a cross coupling capacitor (as thecross coupling capacitor 100a among Fig. 1,100b and 100c) in each point of crossing of directions X lead and Y-direction lead.Be example with Fig. 1, thesecontact panel 10 total m*n cross coupling capacitors.

When object (as finger or pointer) touch-control during to contactpanel 10, object with respond to the capacitance that coupled relation between grid will change the cross coupling capacitor that is close to.The variable quantity of the capacitance of the detectable cross coupling capacitor of detection circuit is surveyed the coordinate position of contact point.

Yet, if certain on the contact panel (a bit) lead is because the bad or lead of the technology equal reason of shape each other, cause the stray capacitance over the ground of each lead may be unequal each other, or those cross coupling capacitors each other unequal (such as,cross coupling capacitor 100a～100c is unequal each other), then cause the erroneous judgement of position of touch easily.

So, the invention provides a kind of capacitance deviation compensating circuit, it can compensate the deviate of stray capacitance over the ground, and/or the deviate of compensation cross coupling capacitor.

Summary of the invention

The present invention relates to a kind of electronic installation, but the deviation of stray capacitance over the ground of its compensating touch control panel, and/or the cross coupling capacitor deviation.

One embodiment of the present invention have proposed a kind of electronic installation, comprising: touch-control input device; Touch control sensing circuit, it is coupled to this touch-control input device; And capacitance deviation compensating circuit.This capacitance deviation compensating circuit comprises: first selector, select one of first coupled voltages of this touch-control input device and second coupled voltages in response to the control signal of this touch control sensing circuit; Second selector selects to drive one of signal or reference voltage in response to this control signal; And the first deviation compensation capacitor array, be coupled to this first selector or this second selector, adjust the output equivalent capacitance in response to this control signal, with the stray capacitance over the ground that compensates this touch-control input device and cross coupling capacitor one of at least.

According to embodiment of the present invention, in this electronic installation, when the first deviation compensation capacitor array compensates this of direction lead of this touch-control input device over the ground during stray capacitance, this first selector is selected this first coupled voltages that this direction lead exports and is exported this first deviation compensation capacitor array to, and this second selector is selected this reference voltage and exported this first deviation compensation capacitor array to.

According to embodiment of the present invention, in this electronic installation, when the first deviation compensation capacitor array compensates this cross coupling capacitor of direction lead of this touch-control input device, this first selector is selected this first coupled voltages that this direction lead exports and is exported this first deviation compensation capacitor array to, and this second selector is selected this driving signal and exported this first deviation compensation capacitor array to.

Another embodiment of the present invention has proposed a kind of electronic installation, comprising: touch-control input device; Touch control sensing circuit, it is coupled to this touch-control input device; And capacitance deviation compensating circuit.The capacitance deviation compensating circuit comprises: first selector, select one of first coupled voltages of this touch-control input device and second coupled voltages in response to the control signal of this touch control sensing circuit; Second selector is selected one of this first coupled voltages and this second coupled voltages in response to this control signal; The first deviation compensation capacitor array is coupled to this first selector and drives signal, adjusts the output equivalent capacitance in response to this control signal, to compensate the cross coupling capacitor of this touch-control input device; And the second deviation compensation capacitor array, be coupled to this second selector and reference voltage, adjust the output equivalent capacitance in response to this control signal, to compensate the stray capacitance over the ground of this touch-control input device.

Another embodiment of the present invention has proposed a kind of electronic installation, comprising: touch-control input device; Touch control sensing circuit, it is coupled to this touch-control input device; And capacitance deviation compensating circuit.The capacitance deviation compensating circuit comprises: the first deviation compensation capacitor array, be coupled to reference voltage in response to the control signal of this touch control sensing circuit or drive signal, be coupled to one of first coupled voltages of this touch-control input device and second coupled voltages in response to this control signal, adjust the output equivalent capacitance in response to this control signal, with the stray capacitance over the ground that compensates this touch-control input device and cross coupling capacitor one of at least.

According to embodiment of the present invention, in this electronic installation, this capacitance deviation compensating circuit also comprises: first selector, and one of this first coupled voltages of conducting and this second coupled voltages are to this first deviation compensation capacitor array in response to this control signal; And second selector, one of this reference voltage of conducting and this driving signal are to this first deviation compensation capacitor array in response to this control signal.

Preferably, when the first deviation compensation capacitor array compensates this of direction lead of this touch-control input device over the ground during stray capacitance, this first coupled voltages that this direction lead of this first selector conducting is exported is to this first deviation compensation capacitor array, and this this reference voltage of second selector conducting is to this first deviation compensation capacitor array.

Preferably, when the first deviation compensation capacitor array compensates this cross coupling capacitor of direction lead of this touch-control input device, this first coupled voltages that this direction lead of this first selector conducting is exported is to this first deviation compensation capacitor array, and this second selector conducting should drive signal to this first deviation compensation capacitor array.

According to embodiment of the present invention, in this electronic installation, this first deviation compensation capacitor array is coupled to this driving signal, to compensate this cross coupling capacitor of this touch-control input device; This capacitance deviation compensating circuit also comprises: the second deviation compensation capacitor array is coupled to this reference voltage, with this stray capacitance over the ground that compensates this touch-control input device; First selector, one of this first coupled voltages of conducting and this second coupled voltages are to this first deviation compensation capacitor array in response to this control signal; And second selector, one of this reference voltage of conducting and this driving signal are to this second deviation compensation capacitor array in response to this control signal.

For foregoing of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:

Description of drawings

Fig. 1 shows the synoptic diagram of the contact panel of prior art.

Fig. 2 shows the electronic installation synoptic diagram of first embodiment of the invention.

Fig. 3 A shows according to the compensation of the first embodiment of the invention equivalent circuit diagram of stray capacitance over the ground.

Fig. 3 B shows the equivalent circuit diagram according to the compensation cross coupling capacitor of first embodiment of the invention.

Fig. 4 shows the synoptic diagram of the electronic installation of second embodiment of the invention.

Embodiment

First embodiment

Fig. 2 shows the synoptic diagram according to the electronic installation of first embodiment of the invention.As shown in Figure 2,electronic installation 200 comprises thatcontact panel 210, drivesignal generation circuit 220, directions X drivechannel selecting module 230, Y-direction driveschannel selecting module 240, selection and detectingmodule 250 and capacitance deviation compensating circuit 260.Directions X driveschannel selecting module 230, Y-direction driveschannel selecting module 240 and can be considered touch control sensing circuit with selection and detectingmodule 250.

Drivesignal generation circuit 220 drives signal D to directions X lead X1～Xm and Y-direction lead X1～Xn in order to produce.Drive signal D for example but be not limited to that square wave driving signal, triangular wave drive signal, the string ripple drives signal etc.

Directions X driveschannel selecting module 230 and comprises m switch, and each switch is controlled by indivedual control signals thatcontrol circuit 2511 produces, and those m control signal inputs to individual switches bysignal wire 232 respectively.Each switch is coupled between the corresponding directions X lead with each of drivesignal generation circuit 220 X1～Xm.The coupled voltages of directions X lead X1～Xm inputs to bysignal wire 231 respectively and selects and detectingmodule 250.

Y-direction driveschannel selecting module 240 and comprises n switch, and each switch is controlled by indivedual control signals thatcontrol circuit 2511 produces, and those n control signal inputs to individual switches bysignal wire 242 respectively.Each switch is coupled between the corresponding Y-direction lead with each of drivesignal generation circuit 220 Y1～Yn.The coupled voltages of Y-direction lead Y1～Yn inputs to bysignal wire 241 respectively and selects and detectingmodule 250.

Select to compriseselection module 251 anddifferential detection module 252 with detecting module 250.Selectmodule 251 to comprisecontrol circuit 2511, the firstmultitask selector switch 2512 and the second multitask selector switch 2513.Capacitance deviation compensating circuit 260 comprises: the 3rdmultitask selector switch 261, the 4thmultitask selector switch 262 and deviation compensation capacitor array 263.Deviationcompensation capacitor array 263 comprises a plurality of building-out capacitors.

Aftercontact panel 210 manufacturings are finished, thiscontact panel 210 is measured, with the stray capacitance over the ground of record all directions lead, and all cross coupling capacitors of this panel, to determine whether to have capacitance deviation.The capacitance of those building-out capacitors is relevant to the departure of the stray capacitance over the ground of all directions lead, and the departure of all cross coupling capacitors of this panel.

The principle of operation of first embodiment now will be described.Control circuit 2511 is scanning (conducting) switch in regular turn.Suppose that the user touches the point of crossing of direction lead X2 and Y1.Under the control ofcontrol circuit 2511, corresponding switch is switched on and makes that driving signal D inputs to Y-direction lead Y1; And coupled voltages VY1X1 and VY1X2 are respectively via the firstmultitask selector switch 2512 and the secondmultitask selector switch 2513 and be coupled to differential detection module 252.Coupled voltages VY1X1 and VY1X2 representative drive signal D be applied to cross coupling capacitor CY1X1 and CY1X2 the coupled voltages of generation respectively.Then, in next sequential, drive signal D and still input to Y-direction lead Y1; And coupled voltages VY1X2 and VY1X3 are respectively via the firstmultitask selector switch 2512 and the secondmultitask selector switch 2513 and be coupled to differential detection module 252.(namely do not have capacitance deviation) in the ideal case,differential detection module 252 can detect VY1X2 ≠ VY1X1 and VY1X2 ≠ VY1X3.So, via the output signal S ofdifferential detection module 252, can judge that the user touches the point of crossing of direction lead X2 and Y1.

Certainly, when surveying position of touch,control circuit 2511 also can make and drive signal D and input to the directions X lead, and the coupled voltages that makes the Y-direction lead is coupled todifferential detection module 252 via the firstmultitask selector switch 2512 and the secondmultitask selector switch 2513.

Yet in actual conditions, the stray capacitance over the ground of each lead may differ from one another, and/or each cross coupling capacitor may differ from one another.So, hereinafter describe first embodiment respectively and compensate the deviate of stray capacitance and the deviate of cross coupling capacitor over the ground as capacitance deviation compensating circuit 260 how.

When carrying out the compensation of capacitance deviation value, under the control ofcontrol circuit 2511, the 3rdmultitask selector switch 261 is connected to deviationcompensation capacitor array 263 with the output signal of one of the firstmultitask selector switch 2512 or secondmultitask selector switch 2513; The 4thmultitask selector switch 262 inputs to deviationcompensation capacitor array 263 with one of reference voltage source VREF or driving signal D;Control circuit 2511 can be selected the adequate compensation electric capacity in the deviationcompensation capacitor array 263.

(1) compensates the deviate of stray capacitance over the ground

The stray capacitance over the ground of supposing directions X lead X2 has deviation.As above-mentioned, whendifferential detecting module 252 when relatively coupled voltages VY1X1 (output signal of the first multitask selector switch 2512) is with VY1X2 (output signal of the second multitask selector switch 2513), under the control ofcontrol circuit 2511, the 3rdmultitask selector switch 261 is connected to deviationcompensation capacitor array 263 with the output signal of the secondmultitask selector switch 2513; And the 4thmultitask selector switch 262 reference voltage source VREF is inputed to deviationcompensation capacitor array 263; The adequate compensation electric capacity thatcontrol circuit 2511 is selected in the deviation compensation capacitor array 263.This equivalence circuit as shown in Figure 3A.In Fig. 3 A, CX2 represents the stray capacitance over the ground of directions X lead X2, and Δ CX2 representative is to the building-out capacitor of the stray capacitance over the ground of directions X lead X2.

Such as, there is correspondingtables control circuit 2511 inside, and whether the stray capacitance over the ground of all direction leads of record Trackpad 210 has deviation and corresponding building-out capacitor thereof.Whencontrol circuit 2511 select to have deviation over the ground the coupled voltages on the direction lead of stray capacitance input todifferential detection module 252,control circuit 2511 can compensate by selecting adequate compensation electric capacity.

(2) deviate of compensation cross coupling capacitor

Suppose that the cross coupling capacitor CY1X2 between directions X lead X2 and Y-direction lead Y1 has deviation.As above-mentioned, whendifferential detecting module 252 when relatively coupled voltages VY1X1 (output signal of the first multitask selector switch 2512) is with VY1X2 (output signal of the second multitask selector switch 2513), under the control ofcontrol circuit 2511, the 3rdmultitask selector switch 261 can be connected to deviationcompensation capacitor array 263 with the output signal of the secondmultitask selector switch 2513; And 262 meetings of the 4th multitask selector switch input to deviationcompensation capacitor array 263 with driving signal D;Control circuit 2511 can be selected the adequate compensation electric capacity in the deviation compensation capacitor array 263.This equivalence circuit is shown in Fig. 3 B.In Fig. 3 B, CY1X2 represents the cross coupling capacitor between directions X lead X2 and Y-direction lead Y1, and Δ CX2Y1 representative is to the building-out capacitor of this cross coupling capacitor CY1X2.

Such as, there is correspondingtables control circuit 2511 inside, and whether its all cross coupling capacitors that record this Trackpad 210 have deviation and corresponding building-out capacitor thereof.Select to have the coupled voltages on the direction lead of deviation cross coupling capacitor to input todifferential detection module 252 whencontrol circuit 2511,control circuit 2511 can compensate by selecting adequate compensation electric capacity.

In above-mentioned example, can compensate stray capacitance and cross coupling capacitor over the ground.That is to say that a plurality of building-out capacitors of deviationcompensation capacitor array 263 inside can compensate stray capacitance and cross coupling capacitor over the ground; Yet, at any one time, can only be at one of stray capacitance or cross coupling capacitor carry out the capacitance deviation compensation over the ground.

But, in other of first embodiment of the invention may example, only compensate over the ground one of stray capacitance or cross coupling capacitor.That is to say that the building-out capacitor of deviationcompensation capacitor array 263 inside only is used for compensating over the ground one of stray capacitance or cross coupling capacitor.

Second embodiment

Fig. 4 shows the synoptic diagram according to theelectronic installation 200A of second embodiment of the invention.Most assembly of second embodiment of the invention is same or similar in first embodiment, so its details does not repeat at this.

In second embodiment of the invention, capacitance deviation compensating circuit 260A also comprises: the first deviation compensation capacitor array 263A1 and the second deviation compensation capacitor array 263A2.The first deviation compensation capacitor array 263A1 and the second deviation compensation capacitor array 263A2 respectively comprise a plurality of building-out capacitors.Wherein, the first deviation compensation capacitor array 263A1 can compensate all cross coupling capacitors of thiscontact panel 210, and the second deviation compensation capacitor array 263A2 then compensates the stray capacitance over the ground of all directions lead.

The principle of operation of second embodiment now will be described.Similarly, when the building-out capacitor deviate, under the control ofcontrol circuit 2511, the 3rdmultitask selector switch 261 is connected to the first deviation compensation capacitor array 263A1 with the output signal of one of the firstmultitask selector switch 2512 or secondmultitask selector switch 2513; The 4thmultitask selector switch 262 is connected to the second deviation compensation capacitor array 263A2 with the output signal of one of the firstmultitask selector switch 2512 or second multitask selector switch 2513.The first deviation compensation capacitor array 263A1 also receives and drives signal D; And the second deviation compensation capacitor array 263A2 also receives reference voltageVREF.Control circuit 2511 can be selected adequate compensation electric capacity and the interior adequate compensation electric capacity of the second deviation compensation capacitor array 263A2 in the first deviation compensation capacitor array 263A1.In second embodiment of the invention, can compensate stray capacitance and cross coupling capacitor over the ground simultaneously.

In sum, though the present invention discloses as above with embodiment, so it is not in order to limit the present invention.The person skilled in the art of the present invention without departing from the spirit and scope of the present invention, can do various changes and retouching.Therefore, protection scope of the present invention should define according to the scope of accompanying Claim book.

The primary clustering symbol description

10,210: contact panel

X1～Xm:X direction lead

Y1～Yn:Y direction lead

100a, 100b, 100c: cross coupling capacitor

200,200A: electronic installation

220: drive signal generation circuit

The 230:X direction drives channel selecting module

The 240:Y direction drives channel selecting module

250: select and detecting module

251: select module

252: the differential detection module

2511: control circuit

2512,2513,261,262: the multitask selector switch

260,260A: capacitance deviation compensating circuit

263,263A1,263A2: deviation compensation capacitor array

CX2: stray capacitance over the ground

CY1X2: cross coupling capacitor

Δ CX2, Δ CX2Y1: building-out capacitor.

Claims (9)

1. electronic installation comprises:

Touch-control input device;

Touch control sensing circuit is coupled to described touch-control input device; And

The capacitance deviation compensating circuit comprises:

First selector is selected one of first coupled voltages of described touch-control input device and second coupled voltages in response to the control signal of described touch control sensing circuit;

Second selector selects to drive one of signal or reference voltage in response to described control signal; And

The first deviation compensation capacitor array, be coupled to described first selector and described second selector, adjust the output equivalent capacitance in response to described control signal, to utilize reference voltage to compensate the stray capacitance over the ground of described touch-control input device or to utilize the cross coupling capacitor that drives the described touch-control input device of signal compensation.

2. electronic installation according to claim 1, wherein, when the first deviation compensation capacitor array compensates the described stray capacitance over the ground of direction lead of described touch-control input device, described first selector is selected described first coupled voltages that described direction lead exports and is exported the described first deviation compensation capacitor array to, and described second selector is selected described reference voltage and exported the described first deviation compensation capacitor array to.

3. electronic installation according to claim 1, wherein, when the first deviation compensation capacitor array compensates the described cross coupling capacitor of direction lead of described touch-control input device, described first selector is selected described first coupled voltages that described direction lead exports and is exported the described first deviation compensation capacitor array to, and described second selector is selected described driving signal and exported the described first deviation compensation capacitor array to.

4. electronic installation comprises:

Touch-control input device;

Touch control sensing circuit is coupled to described touch-control input device; And

The capacitance deviation compensating circuit comprises:

First selector is selected one of first coupled voltages of described touch-control input device and second coupled voltages in response to the control signal of described touch control sensing circuit;

Second selector is selected one of described first coupled voltages and described second coupled voltages in response to described control signal;

The first deviation compensation capacitor array is coupled to described first selector and drives signal, adjusts the output equivalent capacitance in response to described control signal, to compensate the cross coupling capacitor of described touch-control input device; And

The second deviation compensation capacitor array is coupled to described second selector and reference voltage, adjusts the output equivalent capacitance in response to described control signal, to compensate the stray capacitance over the ground of described touch-control input device.

5. electronic installation comprises:

Touch-control input device;

Touch control sensing circuit is coupled to described touch-control input device; And

The capacitance deviation compensating circuit comprises:

The first deviation compensation capacitor array, be coupled to reference voltage in response to the control signal of described touch control sensing circuit and drive signal, be coupled to one of first coupled voltages of described touch-control input device and second coupled voltages in response to described control signal, adjust the output equivalent capacitance in response to described control signal, to utilize reference voltage to compensate the stray capacitance over the ground of described touch-control input device or to utilize the cross coupling capacitor that drives the described touch-control input device of signal compensation.

6. electronic installation according to claim 5, wherein, described capacitance deviation compensating circuit also comprises:

First selector, one of described first coupled voltages of conducting and described second coupled voltages are to the described first deviation compensation capacitor array in response to described control signal; And

Second selector, one of the described reference voltage of conducting and described driving signal are to the described first deviation compensation capacitor array in response to described control signal.

7. electronic installation according to claim 6, wherein, when the first deviation compensation capacitor array compensates the described stray capacitance over the ground of direction lead of described touch-control input device, described first coupled voltages that the described direction lead of described first selector conducting is exported is to the described first deviation compensation capacitor array, and the described reference voltage of described second selector conducting is to the described first deviation compensation capacitor array.

8. electronic installation according to claim 6, wherein, when the first deviation compensation capacitor array compensates the described cross coupling capacitor of direction lead of described touch-control input device, described first coupled voltages that the described direction lead of described first selector conducting is exported is to the described first deviation compensation capacitor array, and the described driving signal of described second selector conducting is to the described first deviation compensation capacitor array.

9. electronic installation according to claim 5, wherein,

The described first deviation compensation capacitor array is coupled to described driving signal, to compensate the described cross coupling capacitor of described touch-control input device;

Described capacitance deviation compensating circuit also comprises:

The second deviation compensation capacitor array is coupled to described reference voltage, to compensate the described stray capacitance over the ground of described touch-control input device;

First selector, one of described first coupled voltages of conducting and described second coupled voltages are to the described first deviation compensation capacitor array in response to described control signal; And

Second selector, one of the described reference voltage of conducting and described driving signal are to the described second deviation compensation capacitor array in response to described control signal.

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