CN202126674U - Touch control circuit of touch screen - Google Patents
Touch control circuit of touch screen Download PDFInfo
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- CN202126674U CN202126674U CN2011202449680U CN201120244968U CN202126674U CN 202126674 U CN202126674 U CN 202126674U CN 2011202449680 U CN2011202449680 U CN 2011202449680U CN 201120244968 U CN201120244968 U CN 201120244968U CN 202126674 U CN202126674 U CN 202126674U
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Abstract
A touch control circuit of a touch screen comprises an alternating current signal source, a voltage division circuit and a back end processing circuit. The voltage division circuit comprises a first branch and a second branch on touch control glass. The first branch and the second branch are adjacent to each other and used for receiving alternating current signals input by the alternating current signal source, and the back end processing circuit is electrically connected to the voltage division circuit and determines the position of a pressing point according to the voltage of the first branch and the second branch. When the human hand presses the touch control glass of the touch screen, electric charges are attracted to change a capacity value, and the capacity value is in proportion to the distance between the human hand and the pressing point. Therefore, the touch control circuit of the touch screen reflects capacity value changes of a first capacity and a second capacity through the voltage division circuit and determines the pressing point. Devices adopted in the circuit are simple, and the capacity changes can be quickly reflected at the output end so that production cost is lowered and responding speed of the circuit is improved.
Description
[technical field]
The utility model relates to touch-screen, particularly relates to a kind of touch-screen touch-control circuit.
[background technology]
At present the sensor circuit of touch-screen is general adopts active and two kinds of passive types.
For active circuit, be to utilize the principle of high frequency radiation and resonance to detect touch point.Be embedded with numerous inductive coils on the tablet, control panel is selected one from numerous inductive coils, and discharges alternating current to it.This inductive coil produces magnetic field under the excitation of electric current, make the resonant circuit storage of electrical energy of the electronic pen that places magnetic field.After the electronic pen storage of electrical energy, control panel stops to the inductive coil release current, and simultaneously, electric energy stored is outwards sent signal through freely shaking of resonant circuit in the electronic pen, and tablet carries out the electricity conversion to the magnetic signal that receives, thereby detects touch point.
For the passive type circuit, mainly be through integrator the electric charge on the tablet to be done to shift accumulation, reach the treatable voltage of back-end circuit, then, go out touch point through voltage detecting.
Two kinds of above-mentioned circuit all exist bigger shortcoming.For active circuit, in order to detect touch point exactly, need establish numerous high-precision inductive coils on the tablet, simultaneously, because signal is fainter, the treatment circuit of rear end is very complicated, causes the raising of production cost.For the passive type circuit; Need the wait integrator that the electric charge on the tablet is done to shift to accumulate and reach the further processing of the treatable voltage of back-end circuit, prolonged the time of circuit reaction, if the reaction time of raising passive type circuit; Then must increase compensating circuit, increase production cost.
[utility model content]
Based on this, be necessary to provide a kind of economy, react touch-screen touch-control circuit fast.
A kind of touch-screen touch-control circuit comprises
Ac signal which;
Bleeder circuit, said bleeder circuit are included in touch-control first branch on glass and second branch, the adjacent AC signal that is used to receive the ac signal which input with second branch of said first branch;
The back-end processing circuit is electrically connected with said bleeder circuit, confirms the touch point position according to the voltage of said first branch and second branch.
In preferred embodiment, said first branch comprises first electric capacity and first divider resistance that is connected with said first electric capacity, and said second branch comprises second electric capacity and second divider resistance that is connected with said second electric capacity.
In preferred embodiment, said first electric capacity and second electric capacity respectively by on the touch-control Glassy Space two intersect and the indium oxide coating of not conducting is coupled and constitutes.
In preferred embodiment, also be provided with and be connected to said ac signal which two ends and identical first equalizing resistance and second equalizing resistance of resistance.
In preferred embodiment; Said bleeder circuit also is provided with the 3rd equalizing resistance and the 4th equalizing resistance that is connected to the said first electric capacity two ends, the 5th equalizing resistance that is connected to the said second electric capacity two ends and the 6th equalizing resistance, and the resistance of said the 3rd equalizing resistance, the 4th equalizing resistance, the 5th equalizing resistance and the 6th equalizing resistance is identical.
In preferred embodiment; Said bleeder circuit also is provided with an end and links to each other with an end of said first electric capacity; The first balanced electric capacity, an end of other end ground connection link to each other with the other end of said first electric capacity; The second balanced electric capacity of other end ground connection, an end link to each other with an end of said second electric capacity; The 3rd balanced electric capacity, an end of other end ground connection link to each other with the other end of said second electric capacity, the 4th balanced electric capacity of other end ground connection, and the appearance value of the said first balanced electric capacity, the second balanced electric capacity, the 3rd balanced electric capacity and the 4th balanced electric capacity is identical.
In preferred embodiment,
Also be provided with the first identical balanced electric capacity of the first identical equalizing resistance of resistance and second equalizing resistance, the 3rd equalizing resistance, the 4th equalizing resistance, the 5th equalizing resistance and the 6th equalizing resistance, appearance value that resistance is identical and the second balanced electric capacity, the 3rd balanced electric capacity and the 4th balanced electric capacity that the appearance value is identical.
One end of said first equalizing resistance links to each other with an end of said the 3rd equalizing resistance, and the other end links to each other with an end of said ac signal which, and the other end of said ac signal which links to each other with an end of said second equalizing resistance; The other end ground connection of said second equalizing resistance; The other end of said the 3rd equalizing resistance links to each other with an end of said first electric capacity, and the other end of said first electric capacity links to each other with an end of said the 4th equalizing resistance, and the other end of said the 4th equalizing resistance links to each other with an end of said first divider resistance; The other end ground connection of said first divider resistance; One end of the said first balanced electric capacity links to each other with the common port of said the 3rd equalizing resistance and said first electric capacity, other end ground connection, and an end of the said second balanced electric capacity links to each other with the common port of said the 4th equalizing resistance and said first electric capacity; Other end ground connection; One end of said the 5th equalizing resistance links to each other with the common port of said first equalizing resistance and said the 3rd equalizing resistance, and the other end links to each other with an end of said second electric capacity, and the other end of said second electric capacity links to each other with an end of said the 6th equalizing resistance; The other end of said the 6th equalizing resistance links to each other with an end of said second divider resistance; The other end ground connection of said second divider resistance, an end of said the 3rd balanced electric capacity links to each other other end ground connection with the common port of said the 5th equalizing resistance and said second electric capacity; One end of said the 4th balanced electric capacity links to each other other end ground connection with the common port of said the 6th equalizing resistance and said second electric capacity.
In preferred embodiment; Said back-end processing circuit comprises with said bleeder circuit and linking to each other, and the amplifying circuit that obtains the calculus of differences circuit of said first divider resistance and the voltage of second divider resistance, the level regulator circuit that links to each other with said calculus of differences circuit, links to each other with said level regulator circuit.
When above-mentioned touch-screen touch-control circuit presses the touch-control glass of touch-screen through staff; Can attract electric charge to change the appearance value size of electric capacity; And the appearance value of electric capacity size is directly proportional with its distance apart from touch point; Therefore, above-mentioned touch-screen touch-control circuit reflects that through bleeder circuit the appearance value of first electric capacity and second electric capacity changes, and confirms touch point.The device that this circuit uses is simple, and changes in capacitance can be promptly in the output terminal reflection, thereby has reduced production cost, has improved the reaction velocity of circuit.
[description of drawings]
Fig. 1 is the equivalent circuit diagram of the touch-screen touch-control circuit of embodiment one;
Fig. 2 is the equivalent circuit diagram of the touch-screen touch-control circuit of embodiment two;
Fig. 3 is the touch point detection method process flow diagram of embodiment one;
Fig. 4 is a touch point detection method back-end processing process flow diagram.
[embodiment]
Describe below in conjunction with concrete embodiment and accompanying drawing.
As shown in Figure 1, the touch-screen touch-control circuit comprises ac signal which V1 and bleeder circuit 110, and the two ends of bleeder circuit 110 are connected with ac signal which V1.
Ac signal which V1 is used for to bleeder circuit 110 AC signal being provided.AC signal output AC sine wave, ac square wave, interchange sawtooth wave, alternating-current pulse or the like.
110 pairs of AC signals from ac signal which V1 input of bleeder circuit are handled.First branch of bleeder circuit 110 comprises first capacitor C 1, the first divider resistance Rv1.Second branch of bleeder circuit 110 comprises second capacitor C 2, the second divider resistance Rv2.
First capacitor C 1 by on the touch-control glass that is used to supply object to press (figure do not show) space two intersect each other and the indium oxide coating of the not conducting formation that is coupled.Because when finger presses, the Partial charge of first capacitor C 1 that touch-control is on glass will shift from finger, the distance of the touch point and first capacitor C 1 is near more, and the electric charge of transfer is many more, and the degree that first capacitor C, 1 electric charge reduces is big more.In other words, when finger pressed touch-control glass formation touch point, the appearance of first capacitor C 1 was worth big young pathbreaker and is directly proportional with the distance of touch point apart from first capacitor C 1.
The first divider resistance Rv1 can be single resistance or a plurality of resistance series and parallel.
Second capacitor C 2 by on the touch-control Glassy Space that is used to supply object to press adjacent with first capacitor C 1 two intersect each other and the indium oxide coating of not conducting is coupled and constitutes.Likewise, when finger pressed touch-control glass formation touch point, second capacitor C, 2 appearance value sizes also were directly proportional with the distance of touch point apart from second capacitor C 2.
The second divider resistance Rv2 can be single resistance or a plurality of resistance series and parallel.The resistance of the first divider resistance Rv1 equals the resistance of the second divider resistance Rv2.
First capacitor C, 1 series connection, the first divider resistance Rv1 constitutes first branch of bleeder circuit 110; Second capacitor C, 2 series connection, the second divider resistance Rv2 constitutes second branch of bleeder circuit 110.Parallel connection second branch of first branch, and first capacitor C 1 links to each other with second capacitor C, 2 one ends.The common port that first capacitor C 1 links to each other with the first divider resistance Rv1 forms the first dividing point O1; The common port that second capacitor C 2 links to each other with the second divider resistance Rv2 forms the second dividing point O2.The end of ac signal which V1 links to each other other end ground connection with the common port of first capacitor C 1 and second capacitor C 2.The common end grounding of the first divider resistance Rv1 and the second divider resistance Rv2.In concrete application, bleeder circuit 110 is provided with a plurality of branches usually, to improve the resolution of touch-screen.
For observation signal better, the touch-screen touch-control circuit also comprises back-end processing circuit 120.Back-end processing circuit 120 comprises the calculus of differences circuit 121 that links to each other with bleeder circuit 110, the level regulator circuit 122 that links to each other with said calculus of differences circuit 121, the amplifying circuit 123 that links to each other with said level regulator circuit 122.
The first input end of calculus of differences circuit 121 is connected to the first dividing point O1, and second input end is connected to the second dividing point O2, and output terminal links to each other with the input end of level regulator circuit 122.The output terminal of level regulator circuit 122 links to each other with the input end of amplifying circuit 123.The output terminal of amplifying circuit 123 is used to export amplifying signal.
During work, ac signal which V1 provides AC signal to bleeder circuit 110.AC signal forms first dividing potential drop at the first dividing point O1; Form second dividing potential drop at the second dividing point O2.
When touch-control glass does not have touchedly, or touch point is when equating with first capacitor C 1, second capacitor C, 2 distances, the appearance value equal and opposite in direction of first capacitor C 1 and second capacitor C 2, thereby first capacitor C 1 equates with the capacitive reactance of second capacitor C 2.First capacitor C 1 equates that with the capacitive reactance of second capacitor C 2 resistance of the first divider resistance Rv1 equals the resistance of the second divider resistance Rv2, and according to the voltage divider principle of bleeder circuit 110, first dividing potential drop equals second dividing potential drop.
When the distance of the touch point and first capacitor C 1 less than the touch point and second capacitor C 2 apart from the time, the appearance value of first capacitor C 1 is less than the appearance value of second capacitor C 2, so the capacitive reactance of first capacitor C 1 is greater than second capacitor C 2.The capacitive reactance of first capacitor C 1 equals the resistance of the second divider resistance Rv2 greater than the resistance of second capacitor C, 2, the first divider resistance Rv1, and according to the voltage divider principle of bleeder circuit 110, first dividing potential drop is less than second dividing potential drop.
When the distance of the touch point and first capacitor C 1 greater than the touch point and second capacitor C 2 apart from the time, the appearance value of first capacitor C 1 is greater than the appearance value of second capacitor C 2, so the capacitive reactance of first capacitor C 1 is less than second capacitor C 2.The capacitive reactance of first capacitor C 1 equals the resistance of the second divider resistance Rv2 less than the resistance of second capacitor C, 2, the first divider resistance Rv1, and according to the voltage divider principle of bleeder circuit 110, first dividing potential drop is greater than second dividing potential drop.
First dividing potential drop is sent to the first input end of calculus of differences circuit 121, and second input end that second dividing potential drop is sent to calculus of differences circuit 121 carries out calculus of differences and obtains differential signal.Differential signal is sent into level regulator circuit 122 to carry out standard position adjustment and obtains adjusting signal.To adjust signal sends into amplifying circuit 123 and amplifies and obtain amplifying signal.Amplifying signal can be judged the touch point position through artificial observation or Computer Processing.That is to say that when back-end processing circuit 120 equaled the voltage of the second divider resistance Rv2 at the voltage of the first divider resistance Rv1, it was touched to judge that touch-control glass does not have, or touch point equates with the distance of first capacitor C 1, second capacitor C 2; Back-end processing circuit 120 during less than the voltage of the second divider resistance Rv2, is judged the distance of the distance of the touch point and first capacitor C 1 less than the touch point and second capacitor C 2 at the voltage of the first divider resistance Rv1; Back-end processing circuit 120 during greater than the voltage of the second divider resistance Rv2, is judged the distance of the distance of the touch point and first capacitor C 1 greater than the touch point and second capacitor C 2 at the voltage of the first divider resistance Rv1.
Further, can calculate, confirm that according to the difference of size touch point departs from the distance of first capacitor C 1 or second capacitor C 2 according to the difference of first dividing potential drop and second dividing potential drop size.
In one embodiment; The system that system shown in Figure 1 is more concrete is as shown in Figure 2; The touch-screen touch-control circuit comprises ac signal which V1 and bleeder circuit 210, and ac signal which V1 two ends link to each other with bleeder circuit 210 after connecting the first equalizing resistance R1, the second equalizing resistance R2 respectively.
Ac signal which V1 is used for to bleeder circuit 210 AC signal being provided.Ac signal which V1 output AC sine wave, ac square wave, interchange sawtooth wave, alternating-current pulse or the like.Ac signal which V1 also is provided with and is connected to said ac signal which V1 two ends and the identical first equalizing resistance R1 and the second equalizing resistance R2 of resistance.
Owing to reasons such as wirings, the conductor length at ac signal which V1 two ends and inconsistent, and always have resistance in the lead, conductor length not simultaneously, the size of resistance is also inequality, receives the influence of conductor resistance, the signal of ac signal which V1 output will drift about.Increase equalizing resistance at ac signal which V1 two ends and can reduce of the influence of the resistance of lead, make the AC signal symmetry of output better, help the processing of follow-up bleeder circuit 210 ac signal which V1.For example, when the resistance of lead one end is 0.1 ohm, the other end is 0.15 ohm, and then error rate is 1-0.1/0.15, is about 33.3%.When 110 ohm equalizing resistance was connected at the lead two ends respectively, then error was 1-(100+0.1)/(100+0.15), is about 0.05%.
210 pairs of AC signals from ac signal which V1 input of bleeder circuit are handled.Bleeder circuit 210 first branch roads comprise first capacitor C 1, the first divider resistance Rv1, the 3rd equalizing resistance R3, the 4th equalizing resistance R4, the first balanced capacitor C v1, the second balanced capacitor C v2; Second branch road comprises second capacitor C 2, the second divider resistance Rv2, the 5th equalizing resistance R5, the 6th equalizing resistance R6, the 3rd balanced capacitor C v3, the 4th balanced capacitor C v4.
First capacitor C 1 by on the touch-control glass that is used to supply object to press (figure do not show) space two intersect each other and the indium oxide coating of the not conducting formation that is coupled.Because when finger presses, the Partial charge of first capacitor C 1 that touch-control is on glass will shift from finger, distance is near more, and the electric charge of transfer is many more.In other words, when finger pressed touch-control glass formation touch point, the appearance of first capacitor C 1 was worth big young pathbreaker and is directly proportional with the distance of touch point apart from first capacitor C 1.
The first divider resistance Rv1 can be single resistance or a plurality of resistance series and parallel.
The 3rd equalizing resistance R3, the 4th equalizing resistance R4 resistance is identical and be connected to first capacitor C, 1 two ends, to 1 proportionality action of first capacitor C.
The first balanced capacitor C v1, the second balanced capacitor C v2 play proportionality action to the distributed capacitance at first capacitor C, 1 two ends.
Second capacitor C 2 by on the touch-control Glassy Space that is used to supply object to press adjacent with first capacitor C 1 two intersect each other and the indium oxide coating of not conducting is coupled and constitutes.Likewise, when finger pressed touch-control glass formation touch point, second capacitor C, 2 appearance value sizes also were directly proportional with the distance of touch point apart from second capacitor C 2.
The second divider resistance Rv2 can be single resistance or a plurality of resistance series and parallel.
The 5th equalizing resistance R5, the 6th equalizing resistance R6 resistance is identical and be connected to second capacitor C, 2 two ends, to 2 proportionality action of second capacitor C.
The 3rd balanced capacitor C v3, the 4th balanced capacitor C v4 play proportionality action to the distributed capacitance at second capacitor C, 2 two ends.
The 4th equalizing resistance R4 links to each other with the first divider resistance Rv1 and forms the first dividing point O1; The 6th equalizing resistance R6 links to each other with the second divider resistance Rv2 and forms the second dividing point O2.
The resistance of the first divider resistance Rv1 equals the resistance of the second divider resistance Rv2.
The 3rd equalizing resistance R3, the 4th equalizing resistance R4, the 5th equalizing resistance R5 are identical with the resistance of the 6th equalizing resistance R6.Owing to reasons such as wirings, the conductor length at first capacitor C 1, second capacitor C, 2 two ends is also inconsistent, and always has resistance in the lead; Conductor length not simultaneously, the size of resistance is also inequality, according to the voltage divider principle of bleeder circuit 210; Receive the influence of resistance, the first dividing point O1, the output voltage values of the second dividing point O2 drifts about; Influence the symmetry of circuit; Therefore, need to add the equalizing resistance that resistance is identical, reduce the influence of conductor resistance bleeder circuit 210 at the two ends of first capacitor C 1, second capacitor C 2.
The first balanced capacitor C v1, the second balanced capacitor C v2, the 3rd balanced capacitor C v3 are worth identical with the appearance of the 4th balanced capacitor C v4.Owing to reasons such as wirings, the conductor length at first capacitor C 1, second capacitor C, 2 two ends is also inconsistent, and always has distributed capacitance in the lead; Conductor length not simultaneously, the size of distributed capacitance is also inequality, according to the voltage divider principle of bleeder circuit 210; Receive the influence of distributed capacitance, the first dividing point O1, the output voltage values of the second dividing point O2 drifts about; Influence the symmetry of circuit; Therefore, need to add the balanced electric capacity that appearance value is identical that minimizing arrangement of conductors electric capacity is to the influence of bleeder circuit 210 at the two ends of first capacitor C 1, second capacitor C 2.
The end of the first equalizing resistance R1 links to each other with the end of the 3rd equalizing resistance R3, and the other end links to each other with the end of ac signal which V1, and the other end of ac signal which V1 links to each other with the end of the second equalizing resistance R2; The other end ground connection of the second equalizing resistance R2; The other end of the 3rd equalizing resistance R3 links to each other with an end of first capacitor C 1, and the other end of first capacitor C 1 links to each other with the end of the 4th equalizing resistance R4, and the other end of the 4th equalizing resistance R4 links to each other with the end of the first divider resistance Rv1; The other end ground connection of the first divider resistance Rv1; The end of the first balanced capacitor C v1 links to each other with the common port of the 3rd equalizing resistance R3 and first capacitor C 1, other end ground connection, and the end of the second balanced capacitor C v2 links to each other with the common port of the 4th equalizing resistance R4 and first capacitor C 1; Other end ground connection; The end of the 5th equalizing resistance R5 links to each other with the common port of the first equalizing resistance R1 and the 3rd equalizing resistance R3, and the other end links to each other with an end of second capacitor C 2, and the other end of second capacitor C 2 links to each other with the end of the 6th equalizing resistance R6; The other end of the 6th equalizing resistance R6 links to each other with the end of the second divider resistance Rv2; The other end ground connection of the second divider resistance Rv2, the end of the 3rd balanced capacitor C v3 links to each other other end ground connection with the common port of the 5th equalizing resistance R5 and second capacitor C 2; The end of the 4th balanced capacitor C v4 links to each other other end ground connection with the common port of the 6th equalizing resistance R6 and second capacitor C 2.Bleeder circuit 210 can be provided with a plurality of branches, to improve the resolution of touch-screen.
For observation signal better, the touch-screen touch-control circuit also comprises back-end processing circuit 220.Back-end processing circuit 220 comprises the calculus of differences circuit 221 that links to each other with bleeder circuit 210, the level regulator circuit 222 that links to each other with said calculus of differences circuit 221, the amplifying circuit 223 that links to each other with said level regulator circuit 222
The first input end of calculus of differences circuit 221 is connected to the first dividing point O1, and second input end is connected to the second dividing point O2, and output terminal links to each other with the input end of level regulator circuit 222.The output terminal of level regulator circuit 222 links to each other with the input end of amplifying circuit 223.The output terminal of amplifying circuit 223 is used to export amplifying signal.
During work, ac signal which V1 is used for to bleeder circuit 210 AC signal being provided.AC signal forms first dividing potential drop at the first dividing point O1; Form second dividing potential drop at the second dividing point O2.
When touch-control glass does not have touched; Or touch point is when equating with first capacitor C 1, second capacitor C, 2 distances; The appearance value equal and opposite in direction of first capacitor C 1 and second capacitor C 2; The resistance of the first divider resistance Rv1 equals the resistance of the second divider resistance Rv2, and the resistance of the 3rd equalizing resistance R3, the 4th equalizing resistance R4, the 5th equalizing resistance R5, the 6th equalizing resistance R6 is identical, and the appearance value of the first balanced capacitor C v1, the second balanced capacitor C v2, the 3rd balanced capacitor C v3, the 4th balanced capacitor C v4 is identical; According to the voltage divider principle of bleeder circuit 210, first dividing potential drop equals second dividing potential drop.
When the distance of the touch point and first capacitor C 1 less than the touch point and second capacitor C 2 apart from the time, the appearance value of first capacitor C 1 is less than the appearance value of second capacitor C 2, so the capacitive reactance of first capacitor C 1 is greater than second capacitor C 2.The capacitive reactance of first capacitor C 1 is greater than second capacitor C 2; The resistance of the first divider resistance Rv1 equals the resistance of the second divider resistance Rv2; The resistance of the 3rd equalizing resistance R3, the 4th equalizing resistance R4, the 5th equalizing resistance R5, the 6th equalizing resistance R6 is identical; The appearance value of the first balanced capacitor C v1, the second balanced capacitor C v2, the 3rd balanced capacitor C v3, the 4th balanced capacitor C v4 is identical, and according to the voltage divider principle of bleeder circuit 210, first dividing potential drop is less than second dividing potential drop.
When the distance of the touch point and first capacitor C 1 greater than the touch point and second capacitor C 2 apart from the time, the appearance value of first capacitor C 1 is greater than the appearance value of second capacitor C 2, so the capacitive reactance of first capacitor C 1 is less than second capacitor C 2.The capacitive reactance of first capacitor C 1 is less than second capacitor C 2; The resistance of the first divider resistance Rv1 equals the resistance of the second divider resistance Rv2; The resistance of the 3rd equalizing resistance R3, the 4th equalizing resistance R4, the 5th equalizing resistance R5, the 6th equalizing resistance R6 is identical; The appearance value of the first balanced capacitor C v1, the second balanced capacitor C v2, the 3rd balanced capacitor C v3, the 4th balanced capacitor C v4 is identical, and according to the voltage divider principle of bleeder circuit 210, first dividing potential drop is greater than second dividing potential drop.
First dividing potential drop is sent to the first input end of calculus of differences circuit 221, and second input end that second dividing potential drop is sent to calculus of differences circuit 221 carries out calculus of differences and obtains differential signal.Differential signal is sent into level regulator circuit 222 to carry out standard position adjustment and obtains adjusting signal.To adjust signal sends into amplifying circuit 223 and amplifies and obtain amplifying signal.Amplifying signal can be judged the touch point position through artificial observation or Computer Processing.
As shown in Figure 3, a kind of detection method of touch point may further comprise the steps:
S310, to bleeder circuit input exchange signal source, said bleeder circuit is included in touch-control first branch on glass and second branch.Said first branch comprises first electric capacity and first divider resistance that is connected with said first electric capacity, and said second branch comprises second electric capacity and second divider resistance that is connected with said second electric capacity.
S320 extracts the voltage of said first branch and second branch.In one embodiment, this step comprises the voltage that extracts said first divider resistance and second divider resistance.
S330 confirms the touch point position according to the voltage of said first branch and second branch.In one embodiment, this step comprises according to the voltage of said first divider resistance and second divider resistance and confirms the touch point position.Step S330 more comprises the steps:
When the voltage of first divider resistance equaled the voltage of second divider resistance, it was touched to judge that touch-control glass does not have, or touch point equates with the distance of first electric capacity, second electric capacity;
During less than the voltage of second divider resistance, judge the distance of the distance of the touch point and first electric capacity at the voltage of first divider resistance less than the touch point and second electric capacity;
During greater than the voltage of second divider resistance, judge the distance of the distance of the touch point and first electric capacity at the voltage of first divider resistance greater than the touch point and second electric capacity.
In one embodiment, method shown in Figure 3 also comprises back-end processing step as shown in Figure 4.
S410 carries out calculus of differences to the voltage of said first divider resistance and said second divider resistance and obtains differential signal.
S420 carries out the adjustment of standard position to said differential signal and obtains adjusting signal.
S430 amplifies said adjustment signal and to obtain amplifying signal.
Further, confirm that according to the voltage of first divider resistance and the voltage difference of said second divider resistance touch point departs from the distance of first electric capacity or second electric capacity.
When the detection method of above-mentioned touch-screen touch-control circuit and touch point presses the touch-control glass of touch-screen through staff; Can attract electric charge to change the appearance value size of electric capacity; And the appearance value of electric capacity size is directly proportional with its distance apart from touch point; Therefore, above-mentioned touch-screen touch-control circuit reflects that through bleeder circuit the appearance value of first electric capacity and second electric capacity changes, and confirms touch point.The device that this circuit uses is simple, and changes in capacitance can be promptly in the output terminal reflection, thereby has reduced production cost, has improved the reaction velocity of circuit.
The above embodiment has only expressed several kinds of embodiments of the utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to the protection domain of the utility model.Therefore, the protection domain of the utility model patent should be as the criterion with accompanying claims.
Claims (8)
1. a touch-screen touch-control circuit is characterized in that, comprises
Ac signal which;
Bleeder circuit, said bleeder circuit are included in touch-control first branch on glass and second branch, the adjacent AC signal that is used to receive the ac signal which input with second branch of said first branch;
The back-end processing circuit is electrically connected with said bleeder circuit, confirms the touch point position according to the voltage of said first branch and second branch.
2. touch-screen touch-control circuit according to claim 1; It is characterized in that; Said first branch comprises first electric capacity and first divider resistance that is connected with said first electric capacity, and said second branch comprises second electric capacity and second divider resistance that is connected with said second electric capacity.
3. touch-screen touch-control circuit according to claim 2 is characterized in that, said first electric capacity and second electric capacity respectively by on the touch-control Glassy Space two intersect and the indium oxide coating of not conducting is coupled and constitutes.
4. touch-screen touch-control circuit according to claim 2 is characterized in that, also is provided with to be connected to said ac signal which two ends and identical first equalizing resistance and second equalizing resistance of resistance.
5. touch-screen touch-control circuit according to claim 2; It is characterized in that; Said bleeder circuit also is provided with the 3rd equalizing resistance and the 4th equalizing resistance that is connected to the said first electric capacity two ends, the 5th equalizing resistance that is connected to the said second electric capacity two ends and the 6th equalizing resistance, and the resistance of said the 3rd equalizing resistance, the 4th equalizing resistance, the 5th equalizing resistance and the 6th equalizing resistance is identical.
6. touch-screen touch-control circuit according to claim 2; It is characterized in that; Said bleeder circuit also is provided with an end and links to each other with an end of said first electric capacity; The first balanced electric capacity, an end of other end ground connection link to each other with the other end of said first electric capacity, and the second balanced electric capacity of other end ground connection, an end link to each other with an end of said second electric capacity, and the 3rd balanced electric capacity, an end of other end ground connection link to each other with the other end of said second electric capacity; The 4th balanced electric capacity of other end ground connection, the appearance value of the said first balanced electric capacity, the second balanced electric capacity, the 3rd balanced electric capacity and the 4th balanced electric capacity is identical.
7. touch-screen touch-control circuit according to claim 2 is characterized in that,
Also be provided with the first identical balanced electric capacity of the first identical equalizing resistance of resistance and second equalizing resistance, the 3rd equalizing resistance, the 4th equalizing resistance, the 5th equalizing resistance and the 6th equalizing resistance, appearance value that resistance is identical and the second balanced electric capacity, the 3rd balanced electric capacity and the 4th balanced electric capacity that the appearance value is identical
One end of said first equalizing resistance links to each other with an end of said the 3rd equalizing resistance, and the other end links to each other with an end of said ac signal which, and the other end of said ac signal which links to each other with an end of said second equalizing resistance; The other end ground connection of said second equalizing resistance; The other end of said the 3rd equalizing resistance links to each other with an end of said first electric capacity, and the other end of said first electric capacity links to each other with an end of said the 4th equalizing resistance, and the other end of said the 4th equalizing resistance links to each other with an end of said first divider resistance; The other end ground connection of said first divider resistance; One end of the said first balanced electric capacity links to each other with the common port of said the 3rd equalizing resistance and said first electric capacity, other end ground connection, and an end of the said second balanced electric capacity links to each other with the common port of said the 4th equalizing resistance and said first electric capacity; Other end ground connection; One end of said the 5th equalizing resistance links to each other with the common port of said first equalizing resistance and said the 3rd equalizing resistance, and the other end links to each other with an end of said second electric capacity, and the other end of said second electric capacity links to each other with an end of said the 6th equalizing resistance; The other end of said the 6th equalizing resistance links to each other with an end of said second divider resistance; The other end ground connection of said second divider resistance, an end of said the 3rd balanced electric capacity links to each other other end ground connection with the common port of said the 5th equalizing resistance and said second electric capacity; One end of said the 4th balanced electric capacity links to each other other end ground connection with the common port of said the 6th equalizing resistance and said second electric capacity.
8. touch-screen touch-control circuit according to claim 2; It is characterized in that; Said back-end processing circuit comprises with said bleeder circuit and linking to each other, and the amplifying circuit that obtains the calculus of differences circuit of said first divider resistance and the voltage of second divider resistance, the level regulator circuit that links to each other with said calculus of differences circuit, links to each other with said level regulator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202449680U CN202126674U (en) | 2011-07-12 | 2011-07-12 | Touch control circuit of touch screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202449680U CN202126674U (en) | 2011-07-12 | 2011-07-12 | Touch control circuit of touch screen |
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| CN202126674U true CN202126674U (en) | 2012-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102880327A (en) * | 2011-07-12 | 2013-01-16 | 宸鸿光电科技股份有限公司 | Touch circuit of touch screen and contact point detecting method |
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2011
- 2011-07-12 CN CN2011202449680U patent/CN202126674U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102880327A (en) * | 2011-07-12 | 2013-01-16 | 宸鸿光电科技股份有限公司 | Touch circuit of touch screen and contact point detecting method |
| CN102880327B (en) * | 2011-07-12 | 2016-03-30 | 宸鸿光电科技股份有限公司 | Touch-screen touch-control circuit and touch point detection method |
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