CN103294326A - Resistance-type touch screen circuit and two-contact touch application method based on resistance-type touch screen - Google Patents
Resistance-type touch screen circuit and two-contact touch application method based on resistance-type touch screen Download PDFInfo
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- CN103294326A CN103294326A CN2012100534387A CN201210053438A CN103294326A CN 103294326 A CN103294326 A CN 103294326A CN 2012100534387 A CN2012100534387 A CN 2012100534387A CN 201210053438 A CN201210053438 A CN 201210053438A CN 103294326 A CN103294326 A CN 103294326A
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Abstract
The invention discloses a resistance-type touch screen circuit and a two-contact touch application method based on a resistance-type touch screen. The resistance-type touch screen circuit, provided by the embodiment of the invention, is applicable to the resistance-type touch screen of electronic equipment. The resistance-type touch screen is provided with two resistive layers comprising an x layer and a y layer; the x layer is pre-equipped with a first power supply bias end and a first grounding end; the y layer is pre-equipped with a second power supply bias end and a second grounding end; the resistance-type touch screen circuit comprises a first analog-to-digital converter passage, a second analog-to-digital converter passage, a third analog-to-digital converter passage and a fourth analog-to-digital converter passage, wherein the first analog-to-digital converter passage is connected with the first power supply bias end through a first switch; the second analog-to-digital converter passage is connected with the first grounding end through a second switch; the third analog-to-digital converter passage is connected with the second power supply bias end through a third switch; and the fourth analog-to-digital converter passage is connected with the second grounding end through a fourth switch. Through the technical scheme provided by the invention, the purpose that the positions of two contacts on the resistance-type touch screen are determined can be realized.
Description
Technical field
The present invention relates to the touch screen technical field, particularly relate to a kind of resistance-type touch screen control circuit and touch application processes based on 2 of the resistance-type touch screen.
Background technology
Nowadays, the touch screen technology successfully applies in the various electronic equipments, the operating experience efficiently that provides a convenient, and for example: touch-screen mobile phone, touch screen computer etc. has enjoyed favor.Wherein, touch screen generally can be divided into types such as infrared-type touch screen, capacitive touch screens, resistance-type touch screen.
For the resistance-type touch screen, it generally is divided into 4 lines, 5 lines, 7 lines, 8 wire resistance type touch screens.Wherein, common 4 wire resistance type touch screen control circuit equivalences as shown in Figure 1, during application as shown in Figure 2.During coordinate information on determining the y axle of a contact, controller determines that YP connects a bias supply VREF, YN ground connection; And XP receives the high impedance input end of an ADC (Analog-to-Digital Converter, A-D converter), and XN ground connection namely connects GND; Because the contact causes X-axis place screen and Y-axis place screen contacts, thus at this moment XP upward voltage just equal this contact and be in dividing potential drop on the Y-axis, this dividing potential drop is relevant with the coordinate of contact on Y-axis.Therefore, A-D converter just can obtain its Y-axis coordinate information to this point voltage sampling and conversion.In like manner can obtain the X-axis coordinate information.
But above-mentioned application system can only realize the single-point touches technology.Often need the multiple point touching technology in the practical application of touch screen; Wherein the most frequently used is exactly 2 touches.The electric resistance touch screen energy simple realization multiple point touching of capacitive touch screen or matrix form, but its price wants high with respect to 4 wire resistance type touch-screens.
Therefore, how to determine the position of two contacts on the resistance-type touch screen, and then realize that 2 touch application of resistance-type touch screen are problems that merits attention.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the invention provides a kind of resistance-type touch screen circuit and has touched application processes based on 2 of resistance-type touch screen, and to determine the position of two contacts on the resistance-type touch screen, technical scheme is as follows:
A kind of resistance-type touch screen circuit is applicable to that in the resistance-type touch screen of an electronic equipment, described resistance-type touch screen has two resistive layer: x layer and y layer, and the x layer is preset with the first power supply offset side, first earth terminal, the y layer is preset with the second source offset side, second earth terminal; Described resistance-type touch screen circuit comprises:
The first A-D converter passage that links to each other with the first power supply offset side by first switch;
The second A-D converter passage that links to each other with first earth terminal by second switch;
The 3rd A-D converter passage that links to each other with the second source offset side by the 3rd switch;
The 4th A-D converter passage that links to each other with second earth terminal by the 4th switch.
The embodiment of the invention also provides a kind of 2 touch application processes based on the resistance-type touch screen, be applicable in the resistance-type touch screen of an electronic equipment, described resistance-type touch screen has two resistive layer: x layer and y layer, and the x layer is preset with the first power supply offset side, first earth terminal, the y layer is preset with the second source offset side, second earth terminal; And the resistive touch screen corresponding circuits comprises: the first A-D converter passage that links to each other with the first power supply offset side by first switch; The second A-D converter passage that links to each other with first earth terminal by second switch; The 3rd A-D converter passage that links to each other with the second source offset side by the 3rd switch; The 4th A-D converter passage that links to each other with second earth terminal by the 4th switch; Described method comprises:
In the process of 2 described resistance-type touch screens of touch, determine first contact and second contact, wherein, described first contact is in time prior to second contact;
With the single-point touches processing mode, determine the coordinate y1 of first contact on the coordinate x1 of first contact on the corresponding X-axis of the first power supply offset side/first earth terminal and the corresponding Y-axis of second source offset side/second earth terminal;
The coordinate of determining described first contact for (x1, y1);
Control the first power supply offset side and add first bias voltage, the first earth terminal ground connection, second source offset side and second earth terminal be outer signal not all; And first switch and second switch all are in off-state, the 3rd switch and the 4th switch all are in conducting state, and then according to the voltage that the 3rd A-D converter passage and the 4th A-D converter passage are gathered, determine the coordinate x2 of second contact on the corresponding X-axis of the first power supply offset side/first earth terminal;
Control second source offset side adds second bias voltage, the second earth terminal ground connection, and the first power supply offset side and first earth terminal be outer signal not all; And first switch and second switch all are in conducting state, the 3rd switch and the 4th switch all are in off-state, and then according to the voltage that the first A-D converter passage and the second A-D converter passage are gathered, determine the coordinate y2 of second contact on the corresponding Y-axis of second source offset side/second earth terminal;
The coordinate of determining second contact for (x2, y2).
Wherein, according to the voltage that the 3rd A-D converter passage and the 4th A-D converter passage are gathered, determine the coordinate x2 of second contact on the corresponding X-axis of the first power supply offset side/first earth terminal, be specially:
Obtain the 3rd A-D converter passage and the 4th A-D converter passage the resultant first voltage V1 and the second voltage V2 of changing behind the voltage sample carried out in second contact;
Utilize the first default relation formula, determine the distance L 3 of second contact to the first earth terminal;
According to the L3 that calculates, determine the coordinate x2 of second contact on the corresponding X-axis of the first power supply offset side/first earth terminal;
Wherein, the described first default relation formula is:
V2/L3＝(VREF1-V1)/L1；
Wherein, L3 is the distance of second contact to the first earth terminal, and L1 is the distance of first contact to the first power supply offset side, and VREF1 is first bias voltage that the first power supply offset side inserts.
Wherein, according to the voltage that the first A-D converter passage and the second A-D converter passage are gathered, determine the coordinate y2 of second contact on the corresponding Y-axis of second source offset side/second earth terminal, be specially:
Obtain the first A-D converter passage and the second A-D converter passage the resultant tertiary voltage V3 that changes and the 4th voltage V4 behind the voltage sample are carried out in second contact;
Utilize the second default relation formula, determine the distance L 6 of second contact to the second earth terminal;
According to the L6 that calculates, determine the coordinate y2 of second contact on the corresponding Y-axis of second source offset side/second earth terminal;
Wherein, the described second default relation formula is:
V4/L6＝(VREF2-V3)/L4；
Wherein, L6 is the distance of second contact to the second earth terminal, L4 be first contact to the distance of second source offset side, VREF2 is second bias voltage that the second source offset side inserts.
Wherein, described method also comprises:
(x1, y1) (x2 y2), determines corresponding feature operation with second contact coordinate according to determined first contact coordinate.
Compared with prior art, scheme provided by the present invention is under the prerequisite that does not increase the requirement of resistance-type touch screen, by controlling the first A-D converter passage that the first power supply offset side connects, the second A-D converter passage that first earth terminal connects, the 3rd A-D converter passage that the second source offset side connects, the access state of the 4th A-D converter passage that second earth terminal connects, the state of control circuit, and then determine coordinate on the y axle of first contact and second contact according to the voltage signal that the first A-D converter passage and the second A-D converter passage are gathered, and, the voltage signal that the 3rd A-D converter passage and the 4th A-D converter passage are gathered is determined coordinate on the x axle of first contact and second contact, has realized the purpose of the position of two contacts on definite resistance-type touch screen with this.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do simple the introduction to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is first kind of circuit equivalent figure of resistance-type touch screen circuit in the prior art;
Fig. 2 is second kind of circuit equivalent figure of resistance-type touch screen circuit in the prior art;
The circuit equivalent figure of a kind of resistance-type touch screen circuit that Fig. 3 provides for the embodiment of the invention;
A kind of 2 process flow diagrams that touch application process based on the resistance-type touch screen that Fig. 4 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Realize that in order to realize utilizing the resistance-type touch screen touch and use the embodiment of the invention and a kind of resistance-type touch screen circuit is provided and has touched the methods of using based on 2 of resistance-type touch screen at 2.
A kind of resistance-type touch screen circuit that at first embodiment of the invention is provided is introduced below.
Need to prove that this resistance-type touch screen circuit is applicable to that in the resistance-type touch screen of an electronic equipment, described resistance-type touch screen has two resistive layer: x layer and y layer, and the x layer is preset with the first power supply offset side, first earth terminal, the y layer is preset with the second source offset side, second earth terminal.
Described resistance-type touch screen circuit can comprise:
The first A-D converter passage that links to each other with the first power supply offset side by first switch;
The second A-D converter passage that links to each other with first earth terminal by second switch;
The 3rd A-D converter passage that links to each other with the second source offset side by the 3rd switch;
The 4th A-D converter passage that links to each other with second earth terminal by the 4th switch.
Need to prove that the bias voltage that the controller in this resistance-type touch screen is controlled each power supply offset side inserts, the ground connection of each earth terminal, and the conducting etc. of controlling each A-D converter passage by the state of controlling each switch.And the first A-D converter passage, the second A-D converter passage, the 3rd A-D converter passage, the 4th A-D converter passage can share an A-D converter, carry out time-sharing multiplex; Perhaps, the first A-D converter passage, the second A-D converter passage, the 3rd A-D converter passage, the 4th A-D converter passage can connect an A-D converter respectively, and this all is rational.
Fig. 3 is the circuit equivalent synoptic diagram of a kind of resistance-type touch screen circuit under 2 touches.Wherein, the first power supply offset side XP is connected with the first A-D converter passage ADC_CH1 by first switch S 1, the first earth terminal XN is connected with the second A-D converter passage ADC_CH2 by second switch S2, second source offset side YP is connected with the 3rd A-D converter passage ADC+CH3 by the 3rd switch S 3, and the second earth terminal YN is connected with the 4th A-D converter passage ADC_CH4 by the 4th switch S 4.
Compared with prior art, scheme provided by the present invention is under the prerequisite that does not increase the requirement of resistance-type touch screen, by controlling the first A-D converter passage that the first power supply offset side connects, the second A-D converter passage that first earth terminal connects, the 3rd A-D converter passage that the second source offset side connects, the access state of the 4th A-D converter passage that second earth terminal connects, the state of control circuit, and then determine coordinate on the Y-axis of first contact and second contact according to the voltage signal that the first A-D converter passage and the second A-D converter passage are gathered, and, the voltage signal that the 3rd A-D converter passage and the 4th A-D converter passage are gathered is determined coordinate on the X-axis of first contact and second contact, has realized the position of two contacts on definite resistance-type touch screen with this.
2 the touch application processes introduction based on the resistance-type touch screen that the embodiment of the invention is provided below.
Need to prove that scheme provided by the present invention is applicable to that in the resistance-type touch screen of an electronic equipment, described resistance-type touch screen has two resistive layer: x layer and y layer, and the x layer is preset with the first power supply offset side, first earth terminal, the y layer is preset with the second source offset side, second earth terminal; And resistance-type touch screen corresponding circuits comprises: the first A-D converter passage that links to each other with the first power supply offset side by first switch; The second A-D converter passage that links to each other with first earth terminal by second switch; The 3rd A-D converter passage that links to each other with the second source offset side by the 3rd switch; The 4th A-D converter passage that links to each other with second earth terminal by the 4th switch; Described method comprises:
S101, controller is determined first contact and second contact in the process of 2 these resistance-type touch screens of touch, wherein, this first contact is in time prior to second contact;
The user is when carrying out 2 touch operation to the resistance-type touch screen, because the circuit response speed is very fast, for circuit, the staff touch action has sequencing certainly, so, in the process of 2 these resistance-type touch screens of touch, can determine time first contact early, and the second later contact of time.
S102 with the single-point touches processing mode, determines the coordinate y1 of first contact on the coordinate x1 of first contact on the corresponding X-axis of the first power supply offset side/first earth terminal and the corresponding Y-axis of second source offset side/second earth terminal;
S103, the coordinate of determining this first contact for (x1, y1);
For first contact, can utilize the single-point touches processing mode, determine the coordinate y1 of first contact on the coordinate x1 of first contact on the corresponding X-axis of the first power supply offset side/first earth terminal and the corresponding Y-axis of second source offset side/second earth terminal, and then the coordinate of determining this first contact be (x1, y1).
Need to prove, when needs obtain the coordinate x1 of first contact, can control the first power supply offset side and add a bias voltage, the first earth terminal ground connection, second source offset side and second earth terminal be outer signal not all; And the first A-D converter passage all is in off-state with first switch and second switch that the second A-D converter passage is connected respectively, the 3rd switch conduction that the 3rd A-D converter passage connects, make the 3rd A-D converter passage conducting, and then the voltage signal that utilizes the 3rd A-D converter passage to gather is determined the coordinate x1 of first contact; Perhaps, the first A-D converter passage all is in off-state with first switch and second switch that the second A-D converter passage is connected respectively, the 3rd switch and the equal conducting of the 4th switch that the 3rd A-D converter passage and the 4th A-D converter passage are connected respectively, make the 3rd A-D converter passage and the equal conducting of the 4th A-D converter passage, and then the voltage signal that utilizes the 3rd A-D converter passage or the 4th A-D converter passage to gather is determined the coordinate x1 of first contact.Be understandable that at this moment, because only there is a contact, the 3rd A-D converter passage is the same with the signal value that the 4th A-D converter passage is gathered.
Same, when needs obtain the coordinate y1 of first contact, can control the second source offset side and add a bias voltage, the second earth terminal ground connection, the first power supply offset side and first earth terminal be outer signal not all; And the 3rd A-D converter passage all is in off-state with the 3rd switch and the 4th switch that the 4th A-D converter passage is connected respectively, first switch conduction that the first A-D converter passage connects, make the A-D converter passage conducting of winning, and then the voltage signal that utilizes the first A-D converter passage to gather is determined the coordinate y1 of first contact; Perhaps, the 3rd A-D converter passage all is in off-state with the 3rd switch and the 4th switch that the 4th A-D converter passage is connected respectively, first switch and the equal conducting of second switch that the first A-D converter passage and the second A-D converter passage are connected respectively, make win A-D converter passage and the equal conducting of the second A-D converter passage, and then the voltage signal that utilizes the first A-D converter passage or the second A-D converter passage to gather is determined the coordinate y1 of first contact.Be understandable that at this moment, because only there is a contact, the first A-D converter passage is the same with the signal value that the second A-D converter passage is gathered.
Be understandable that at the added bias voltage of the first power supply offset side and can be identical or different at the added bias voltage of second source, this all is rational.
S104 controls the first power supply offset side and adds first bias voltage, the first earth terminal ground connection, and second source offset side and second earth terminal be outer signal not all; And first switch and second switch all are in off-state, and the 3rd switch and the 4th switch all are in conducting state;
S105 according to the voltage that the 3rd A-D converter passage and the 4th A-D converter passage are gathered, determines the coordinate x2 of second contact on the corresponding X-axis of the first power supply offset side/first earth terminal;
Wherein, according to the voltage that the 3rd A-D converter passage and the 4th A-D converter passage are gathered, determine the coordinate x2 of second contact on the corresponding X-axis of the first power supply offset side/first earth terminal, be specially:
Obtain the 3rd A-D converter passage and the 4th A-D converter passage the resultant first voltage V1 and the second voltage V2 of changing behind the voltage sample carried out in second contact;
Utilize the first default relation formula, determine the distance L 3 of second contact to the first earth terminal;
According to the L3 that calculates, determine the coordinate x2 of second contact on the x axle;
Wherein, the described first default relation formula is:
V2/L3＝(VREF1-V1)/L1；
Wherein, L3 is the distance of second contact to the first earth terminal, and L1 is the distance of first contact to the first power supply offset side, and VREF1 is first bias voltage that the first power supply offset side inserts.
S106, control second source offset side adds second bias voltage, the second earth terminal ground connection, the first power supply offset side and first earth terminal be outer signal not all; And first switch and second switch all are in conducting state, and the 3rd switch and the 4th switch all are in off-state;
S107 according to the voltage that the first A-D converter passage and the second A-D converter passage are gathered, determines the coordinate y2 of second contact on the corresponding Y-axis of second source offset side/second earth terminal;
Wherein, according to the voltage that the first A-D converter passage and the second A-D converter passage are gathered, determine the coordinate y2 of second contact on the y axle, be specially:
Obtain the first A-D converter passage and the second A-D converter passage the resultant tertiary voltage V3 that changes and the 4th voltage V4 behind the voltage sample are carried out in second contact;
Utilize the second default relation formula, determine the distance L 6 of second contact to the second earth terminal;
According to the L6 that calculates, determine the coordinate y2 of second contact on the Y-axis;
Wherein, the described second default relation formula is:
V4/L6＝(VREF2-V3)/L4；
Wherein, L6 is the distance of second contact to the second earth terminal, L4 be first contact to the distance of second source offset side, VREF2 is second bias voltage that the second source offset side inserts.
Be understandable that second bias voltage that first bias voltage that the first power supply offset side inserts and second source offset side insert can be identical or different, this all is rational.
S108, the coordinate of determining second contact for (x2, y2).
Scheme provided by the present invention is under the prerequisite that does not increase the requirement of resistance-type touch screen, by controlling the first A-D converter passage that the first power supply offset side connects, the second A-D converter passage that first earth terminal connects, the 3rd A-D converter passage that the second source offset side connects, the access state of the 4th A-D converter passage that second earth terminal connects, the state of control circuit, and then determine coordinate on the y axle of second contact according to the voltage signal that the first A-D converter passage and the second A-D converter passage are gathered, and, the voltage signal that the 3rd A-D converter passage and the 4th A-D converter passage are gathered is determined coordinate on the x axle of second contact, has realized the position of two contacts on definite resistance-type touch screen with this.
Further, determine first contact coordinate (x1, y1) and second contact coordinate (x2, y2) after, can determine the corresponding feature operation in first contact and second contact.
A kind of 2 the touch application processes based on the resistance-type touch screen that provide below in conjunction with the embodiment of the invention of Fig. 3 are introduced.
Fig. 3 is the circuit equivalent synoptic diagram of resistance-type touch screen circuit under 2 touches (K1 and K2).Wherein, the first power supply offset side XP is connected with the first A-D converter passage ADC_CH1 by first switch S 1, the first earth terminal XN is connected with the second A-D converter passage ADC_CH2 by second switch S2, second source offset side YP is connected with the 3rd A-D converter passage ADC_CH3 by the 3rd switch S 3, and the second earth terminal YN is connected with the 4th A-D converter passage ADC_CH4 by the 4th switch S 4.The X-axis of XP/XN correspondence resistance under 2 touches is divided into three sections of R1, R2, R3, and YP/YN resistance under 2 touches is divided into three sections of R4, R5, R6.
Obtain the X-axis coordinate time at needs, add a bias voltage VREF from XP, XN ground connection, YP and YN be outer signal not all, control S1 and S2 disconnect, so that path ADC_CH1 and ADC_CH2 disconnect, and control S3 and S4 conducting, so that path ADC_CH3 and ADC_CH4 conducting.
With K1, K2 analog contacts; When single-point touches, suppose the conducting that is touched of K1 point, this moment, K2 disconnected, the X-axis touched point is divided into two sections, and resistance is R1 and (R2+R3), this contact K1 dividing potential drop on the X-axis, voltage is by ADC_CH3 and ADC_CH4 sample conversion, the same just can the checking of conversion value is single-point touches, and can access K1 point dividing potential drop VK1 based on conversion value, and VK1/ (Vxp-Vxn) just can judge the coordinate x1 of touch point X-axis.When touch, suppose K1 and the K2 conducting that all is touched, owing to the circuit response speed is very fast at 2, for circuit, it is that sequencing is arranged certainly that the staff movable contact is touched, and supposes that K1 touches earlier, and circuit response meeting fast obtains K1 coordinate x1 rapidly with the processing mode of single-point touches; When all being touched for 2, the value that ADC_CH3 and ADC_CH4 sample conversion obtain is different certainly, is made as V1/V2, and V1 and V2 vary in size and can be used as criterion and be confirmed to be 2 touches.This moment is not because YP/YN has outer signal, and the electric current that flows through on the R1/R3 equates, establish 2 resistance R 1 when touching, R2, R3 respectively corresponding length be L1, L2, L3, V2/L3=(VREF-V1)/L1 then; Because the circuit response speed is very fast, can think that the position that K1/K2 is ordered does not also change, this moment, L1 can be determined by x1 before, knew that L1 can obtain L3 by the co-relation formula, therefore can obtain current K2 coordinate x2.
At this moment, touch for discrete two point, can determine its coordinate figure at once.For 2 continuous line operations, touch starting point x coordinate x1 separately known two of this moment, x2, when touching line, current ADC_CH3 and ADC_4 sample conversion obtain current V1 and V2, and current V2/L3=(the VREF-V1)/L1 that concerns is arranged equally; Because circuit reaction is very fast, can think that the distance that touch point in fact moves is also very short, can obtain current x1 or x2 by X2 or current relational expression V2/L3=(the VREF-V1)/L1 of X1 substitution of last time.In like manner, sample conversion and interative computation can obtain new X-axis two point coordinate again.The acquisition of x axial coordinate in the time of so can realizing 2 touches.
In like manner, pour into a bias voltage VREF at YP/YN, can measure single-point touches or two point and touch the coordinate figure of Y-axis down.
Need to prove that contact resistance was less when scheme provided by the present invention required touch screen to be touched, and can not touch too light when namely requiring to touch.Simultaneously, for 2 touches, on absolute time, 2 touch the free interval of time requirement.
As seen, by scheme provided by the present invention, can determine 2 coordinate position of resistance-type touch screen, and then 2 touches that are implemented in the resistance-type touch screen are used.
The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a resistance-type touch screen circuit is applicable to that in the resistance-type touch screen of an electronic equipment, described resistance-type touch screen has two resistive layer: x layer and y layer, and the x layer is preset with the first power supply offset side, first earth terminal, the y layer is preset with the second source offset side, second earth terminal; It is characterized in that described resistance-type touch screen circuit comprises:
The first A-D converter passage that links to each other with the first power supply offset side by first switch;
The second A-D converter passage that links to each other with first earth terminal by second switch;
The 3rd A-D converter passage that links to each other with the second source offset side by the 3rd switch;
The 4th A-D converter passage that links to each other with second earth terminal by the 4th switch.
2. one kind touches application processes based on 2 of the resistance-type touch screen, it is characterized in that, be applicable in the resistance-type touch screen of an electronic equipment, described resistance-type touch screen has two resistive layer: x layer and y layer, and the x layer is preset with the first power supply offset side, first earth terminal, the y layer is preset with the second source offset side, second earth terminal; And the resistive touch screen corresponding circuits comprises: the first A-D converter passage that links to each other with the first power supply offset side by first switch; The second A-D converter passage that links to each other with first earth terminal by second switch; The 3rd A-D converter passage that links to each other with the second source offset side by the 3rd switch; The 4th A-D converter passage that links to each other with second earth terminal by the 4th switch; Described method comprises:
In the process of 2 described resistance-type touch screens of touch, determine first contact and second contact, wherein, described first contact is in time prior to second contact;
With the single-point touches processing mode, determine the coordinate y1 of first contact on the coordinate x1 of first contact on the corresponding X-axis of the first power supply offset side/first earth terminal and the corresponding Y-axis of second source offset side/second earth terminal;
The coordinate of determining described first contact for (x1, y1);
Control the first power supply offset side and add first bias voltage, the first earth terminal ground connection, second source offset side and second earth terminal be outer signal not all; And first switch and second switch all are in off-state, the 3rd switch and the 4th switch all are in conducting state, and then according to the voltage that the 3rd A-D converter passage and the 4th A-D converter passage are gathered, determine the coordinate x2 of second contact on the corresponding x axle of the first power supply offset side/first earth terminal;
Control second source offset side adds second bias voltage, the second earth terminal ground connection, and the first power supply offset side and first earth terminal be outer signal not all; And first switch and second switch all are in conducting state, the 3rd switch and the 4th switch all are in off-state, and then according to the voltage that the first A-D converter passage and the second A-D converter passage are gathered, determine the coordinate y2 of second contact on the corresponding Y-axis of second source offset side/second earth terminal;
The coordinate of determining second contact for (x2, y2).
3. method according to claim 1 is characterized in that, according to the voltage that the 3rd A-D converter passage and the 4th A-D converter passage are gathered, determines the coordinate x2 of second contact on the corresponding X-axis of the first power supply offset side/first earth terminal, is specially:
Obtain the 3rd A-D converter passage and the 4th A-D converter passage the resultant first voltage V1 and the second voltage V2 of changing behind the voltage sample carried out in second contact;
Utilize the first default relation formula, determine the distance L 3 of second contact to the first earth terminal;
According to the L3 that calculates, determine the coordinate x2 of second contact on the corresponding X-axis of the first power supply offset side/first earth terminal;
Wherein, the described first default relation formula is:
V2/L3＝(VREF1-V1)/L1；
Wherein, L3 is the distance of second contact to the first earth terminal, and L1 is the distance of first contact to the first power supply offset side, and VREF1 is first bias voltage that the first power supply offset side inserts.
4. method according to claim 3 is characterized in that, according to the voltage that the first A-D converter passage and the second A-D converter passage are gathered, determines the coordinate y2 of second contact on the corresponding Y-axis of second source offset side/second earth terminal, is specially:
Obtain the first A-D converter passage and the second A-D converter passage the resultant tertiary voltage V3 that changes and the 4th voltage V4 behind the voltage sample are carried out in second contact;
Utilize the second default relation formula, determine the distance L 6 of second contact to the second earth terminal;
According to the L6 that calculates, determine the coordinate y2 of second contact on the corresponding Y-axis of second source offset side/second earth terminal;
Wherein, the described second default relation formula is:
V4/L6＝(VREF2-V3)/L4；
Wherein, L6 is the distance of second contact to the second earth terminal, L4 be first contact to the distance of second source offset side, VREF2 is second bias voltage that the second source offset side inserts.
5. method according to claim 2 is characterized in that, described method also comprises:
(x1, y1) (x2 y2), determines corresponding feature operation with second contact coordinate according to determined first contact coordinate.
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Application publication date: 20130911 |