CN103246424B - A kind of resistive touch screen and detected touch point sit calibration method - Google Patents
A kind of resistive touch screen and detected touch point sit calibration method Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of resistive touch screen detected touch point to sit calibration method, and described touch screen includes, the first resistive layer, the second resistive layer and some voltameters；Described method is: obtain two touch points, provides constant current to the first resistive layer；Calculate the difference of magnitude of voltage between the first high-pressure stage and the first low pressure pole, obtain the first voltage difference；Voltameter is utilized to measure the magnitude of voltage at each touch point, and utilize the magnitude of voltage at described first voltage difference and each touch point, calculate the voltage distributed on resistance between the first high-pressure stage and the first touch point, and the voltage distributed on resistance between the first low pressure pole and the second touch point；Utilize the proportionate relationship of two sections of resistance and the first voltage difference as this resistive linearity length and the proportionate relationship of total length on the first resistive layer distribution of resistance direction；And according to aforementioned proportion relation and the coordinate figure set in advance each touch point of conversion coordinate figure on the first resistive layer.
Description
Technical field
The present invention relates to touch screen technology field, sit calibration method particularly to a kind of resistive touch screen and detected touch point.
Background technology
Along with growing with each passing day of multimedia information inquiry, people speak of touch screen more and more, because on the one hand touch screen technology is the trend trend of current electronic product, on the other hand the touch screen technology of present stage is the most ripe, and touch screen has that sturdy and durable, response speed is fast, save space, be prone to many advantages such as exchange.Utilize this technology, as long as user touches the icon on computer display lightly with finger or word can be achieved with host service function, so that man-machine interaction is the most simple and direct.
Touch screen technology imparts multimedia with brand-new looks, is extremely attractive brand-new multimedia interactive equipment.Touch screen is boundless in the range of application of China, relates to the inquiry of public information, office, Industry Control, military commanding, electronic game, choosing song or selecting dish, multimedia teaching, real estate presell etc..
The touch screen that present stage is widely used, according to its operation principle, substantially can be divided into: resistance-type, condenser type, surface acoustic wave type, infrared type, bending waves and optical imaging type etc..The features such as wherein resistive touch screen is cheap with it, sensitivity is good, stability is strong and durable, the touch screen in numerous kinds has powerful competitiveness all the time.
The operation principle of resistive touch screen is: touch screen comprises upper strata and two resistive layers of lower floor, and on resistive layer, resistance is uniformly distributed in one direction, and it is horizontal for can arranging wherein one layer of distribution of resistance direction, and another layer of distribution of resistance direction is longitudinally.When touch screen surface pressure experienced (as pressed by nib or finger) is sufficiently large, contact can be produced between upper and lower two resistive layers, utilize voltage divider principle to produce the voltage representing abscissa and vertical coordinate.When namely coming in contact between two-layer, resistive surface is separated into two resistance laterally or longitudinally, two-part resistance is directly proportional to the distance at laterally or longitudinally two corresponding edges with touch point, it follows that the abscissa of this touch point and vertical coordinate.Its circuit diagram is shown in Figure 1.
Only can realize the detection of resistive touch screen single-touch according to above-mentioned principle, i.e. obtain the coordinate figure of a touch point.But owing to the demand of present stage user improves day by day, only single-point detection cannot meet the needs of actual application.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of resistive touch screen and detected touch point sits calibration method, it is achieved the coordinate of detection two touch points of touch screen.
For achieving the above object, one embodiment of the present of invention provides a kind of resistive touch screen and detected touch point to sit calibration method, and concrete technical scheme is as follows:
A kind of resistive touch screen detected touch point sits calibration method, and described touch screen includes, the first resistive layer, the second resistive layer and some voltameters；Resistance on described first resistive layer and the second resistive layer is uniformly distributed in one direction；First resistive layer and the second resistive layer overlapping are placed and the distribution of resistance direction of the two is orthogonal；There is clearance for insulation in two resistance interlayers, clearance for insulation is fitted at touch point and turns on electric current, described method particularly as follows:
A, obtain two touch points of described resistive touch screen, it is respectively the first touch point and the second touch point, constant current is provided to the first resistive layer, first resistive layer two ends on the direction of distribution of resistance are respectively the first high-pressure stage and the first low pressure pole, and constant current is flowed to the first low pressure pole by the first high-pressure stage；
B, utilize voltameter to measure the first high-pressure stage and the magnitude of voltage of the first low pressure pole of the first resistive layer, and calculate the difference of magnitude of voltage between the first high-pressure stage and the first low pressure pole, obtain the first voltage difference；
C, voltameter is utilized to measure the magnitude of voltage at each touch point, and utilize the magnitude of voltage at described first voltage difference and each touch point, calculate the voltage distributed on resistance between the first high-pressure stage and the first touch point, and the voltage distributed on resistance between the first low pressure pole and the second touch point respectively；
D, by resistance between the first high-pressure stage and the first touch point distribution voltage and the proportionate relationship of the first voltage difference, and first distribution on resistance between low pressure pole and the second touch point magnitude of voltage and the proportionate relationship of the first voltage difference, as the proportionate relationship of total length in this resistive linearity length and the first resistive layer distribution of resistance direction；Preset the first high-pressure stage and the coordinate figure of the first low pressure pole, and according to aforementioned proportion relation and the coordinate figure set in advance each touch point of conversion coordinate figure on the first resistive layer.
Preferably, described method also includes:
F, to second resistive layer provide constant current, second resistive layer two ends on the direction of distribution of resistance are respectively the second high-pressure stage and the second low pressure pole, and constant current is flowed to the second low pressure pole by the second high-pressure stage；
G, utilize voltameter to measure the second high-pressure stage and the magnitude of voltage of the second low pressure pole, and calculate the difference of magnitude of voltage between the second high-pressure stage and the second low pressure pole, obtain the second voltage difference；
H, voltameter is utilized to measure the magnitude of voltage at each touch point, and utilize the magnitude of voltage at described second voltage difference and each touch point, calculate the voltage distributed on resistance between the second high-pressure stage and the first touch point, and the voltage distributed on resistance between the second low pressure pole and the second touch point respectively；
I, by resistance between the second high-pressure stage and the first touch point distribution voltage and the proportionate relationship of the second voltage difference, and second distribution on resistance between low pressure pole and the second touch point magnitude of voltage and the proportionate relationship of the second voltage difference, as the proportionate relationship of total length in this resistive linearity length and the second resistive layer distribution of resistance direction；Preset the second high-pressure stage and the coordinate figure of the second low pressure pole, and according to aforementioned proportion relation and the coordinate figure set in advance each touch point of conversion coordinate figure on the second resistive layer.
Preferably, described first one section, high pressure best the first touch point resistance is high section resistance, and first one section, low pressure best the second touch point resistance is low section of resistance, the most described step C particularly as follows:
C1, the magnitude of voltage that utilizes voltameter to record the first touch point be the first magnitude of voltage, the magnitude of voltage recording the second touch point is the second magnitude of voltage；The magnitude of voltage utilizing the first high-pressure stage subtracts the first, and magnitude of voltage obtains high section resistance both end voltage；The magnitude of voltage utilizing the second magnitude of voltage low pressure pole that subtracts the first obtains low-side resistor both end voltage.
Two touch points of the described resistive touch screen of described acquisition particularly as follows:
S1, there is no touch point on the touchscreen in the case of, to first resistive layer provide constant current, constant current is flowed to the first low pressure pole by the first high-pressure stage；
S2, measure and there is no the first high-pressure stage and a magnitude of voltage of the first low pressure pole in the case of touch point, and calculate in the case of there is no touch point the difference of magnitude of voltage between the first high-pressure stage and the first low pressure pole, obtain primary voltage poor；
S3, exist on the premise of one or two touch point, measure the first high-pressure stage and the magnitude of voltage of the first low pressure pole, and calculate and there is on the premise of the touch point that quantity is unknown the difference of magnitude of voltage between first high-pressure stage and the first low pressure pole, obtain reference voltage poor；
S4, comparison reference voltage difference with primary voltage poor, when with reference to voltage difference numerical value equal to primary voltage poor, it is determined that touch point quantity is one, when reference voltage difference numerical value be less than primary voltage poor, it is determined that touch point quantity is two.
Preferably, after determining that touch point quantity is one, the most described touch point is one-touch point, and described method also includes:
T1, utilize voltameter to measure the magnitude of voltage at one-touch point, first resistive layer is divided into two sections of resistance by described one-touch o'clock, utilize the magnitude of voltage at described primary voltage difference and one-touch point, calculate the magnitude of voltage distributed on two sections of resistance every section resistance on the first resistive layer respectively；
T2, using the proportionate relationship of magnitude of voltage and the primary voltage difference of distribution on two sections of resistance as the proportionate relationship of this resistive linearity length Yu the first resistive layer distribution of resistance direction total length；Preset the first high-pressure stage and the coordinate figure of the first low pressure pole, and according to aforementioned proportion relation and the coordinate figure set in advance conversion one-touch o'clock coordinate figure on the first resistive layer.
A kind of resistive touch screen, described touch screen includes: constant current source, the first resistive layer, the second resistive layer, voltage check device and processor, particularly as follows:
Constant current source, for providing constant current to the first resistive layer and/or the second resistive layer；
First resistive layer and the second resistive layer, resistance is uniformly distributed in one direction, and described first resistive layer and the second resistive layer overlapping are placed, and distribution of resistance direction is orthogonal, and two resistance interlayers exist clearance for insulation, and clearance for insulation is fitted at touch point and turns on electric current；First resistive layer two ends along the direction of distribution of resistance are respectively the first high-pressure stage and the first low pressure pole, second resistive layer two ends along the direction of distribution of resistance are respectively the second high-pressure stage and the second low pressure pole, preset the first high-pressure stage, the first low pressure pole, the second high-pressure stage and the coordinate figure of the second low pressure pole；
Voltage check device, including some voltameters, for measuring the magnitude of voltage of each point on the first resistive layer and/or the second resistive layer；
Processor, for obtaining two touch points of described resistive touch screen, control constant current source and provide constant current to the first resistive layer, and command voltage detects the first high-pressure stage and the voltage of the first low pressure pole of measurement device the first resistive layer, and the voltage of two touch points；Processor obtains the magnitude of voltage at described first high-pressure stage and the voltage of the first low pressure pole and two touch points, using the voltage difference between the first high-pressure stage and the first low pressure pole as the first voltage difference, calculate the voltage distributed on resistance between the first high-pressure stage and the first touch point, and the voltage distributed on resistance between the first low pressure pole and the second touch point；By the voltage distributed on resistance between the first high-pressure stage and the first touch point and the proportionate relationship of the first voltage difference, and first distribution on resistance between low pressure pole and the second touch point magnitude of voltage and the proportionate relationship of the first voltage difference, as the proportionate relationship of total length in this resistive linearity length and the first resistive layer distribution of resistance direction；According to aforementioned proportion relation and the coordinate figure set in advance each touch point of conversion coordinate figure on the first resistive layer.
Preferably, described processor is additionally operable to:
Control constant current source and provide constant current to the second resistive layer, and command voltage detects the second high-pressure stage and the voltage of the second low pressure pole of measurement device the second resistive layer, and the voltage of two touch points；Processor obtains the magnitude of voltage at described second high-pressure stage and the voltage of the second low pressure pole and two touch points, using the voltage difference between the second high-pressure stage and the second low pressure pole as the second voltage difference, calculate the voltage distributed on resistance between the second high-pressure stage and the first touch point, and the voltage distributed on resistance between the second low pressure pole and the second touch point；By the voltage distributed on resistance between the second high-pressure stage and the first touch point and the proportionate relationship of the second voltage difference, and second distribution on resistance between low pressure pole and the second touch point magnitude of voltage and the proportionate relationship of the second voltage difference, as the proportionate relationship of total length in this resistive linearity length and the second resistive layer distribution of resistance direction；According to aforementioned proportion relation and the coordinate figure set in advance each touch point of conversion coordinate figure on the second resistive layer.
Described processor calculates between the first high-pressure stage and the first touch point the voltage of distribution on resistance, and between the first low pressure pole and the second touch point on resistance distribution voltage particularly as follows:
It is high section resistance that processor takes first one section, high pressure best the first touch point resistance, and taking first one section, low pressure best the second touch point resistance is low section of resistance；It is the first magnitude of voltage that processor takes the magnitude of voltage of the first touch point, and the magnitude of voltage taking the second touch point is the second magnitude of voltage；The magnitude of voltage utilizing the first high-pressure stage subtracts the first, and magnitude of voltage obtains high section resistance both end voltage；The magnitude of voltage utilizing the second magnitude of voltage low pressure pole that subtracts the first obtains low-side resistor both end voltage.
Described processor obtain resistive touch screen two touch points particularly as follows:
Processor instruction voltage check device is measured respectively does not has first resistive layer the first high-pressure stage and the voltage difference of the first low pressure pole in the case of touch point, and first resistive layer the first high-pressure stage and the voltage difference of the first low pressure pole on the premise of there is one or two touch point；
Processor obtains does not has the voltage difference of the first high-pressure stage and the first low pressure pole in the case of touch point poor as primary voltage, obtain the voltage difference of the first high-pressure stage and the first low pressure pole on the premise of there is one or two touch point the poorest, it is poor with reference voltage that processor compares primary voltage difference, when poor equal to primary voltage with reference to voltage difference numerical value, then determine that touch point quantity is one, when poor less than primary voltage with reference to voltage difference numerical value, it is determined that touch point quantity is two.
Preferably, described processor is additionally operable to calculate the coordinate figure of touch point in the case of touch point quantity is, particularly as follows:
The magnitude of voltage at this touch point measured by processor instruction voltameter, and processor obtains the magnitude of voltage at described primary voltage difference and this touch point, calculates the magnitude of voltage that the two sections of resistance being divided into by this touch point on the first resistive layer each distributes；Processor using the proportionate relationship of magnitude of voltage and the primary voltage difference of distribution on two sections of resistance as the proportionate relationship of this resistive linearity length Yu resistive layer distribution of resistance direction total length；And convert this touch point coordinate figure on the first resistive layer according to the coordinate figure of aforementioned proportion relation and the first high-pressure stage set in advance and the first low pressure pole.
As seen through the above technical solutions, present invention existence provides the benefit that, it is achieved that detection two touch point coordinates of resistive touch screen, improves the situation that can only detect single touch point coordinate in prior art, improves the performance of resistive touch screen；It addition, the present invention can also realize judging on described resistive touch screen that touch point quantity is specially one or two function, and take, according to different touch point quantity, the coordinate that corresponding detection method detects one or two touch point.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is prior art resistive touch screen structure schematic diagram；
Fig. 2 is that resistive touch screen of the present invention detects two point coordinates method flow diagrams；
Fig. 3 is resistive touch screen equivalent circuit diagram in the embodiment of the present invention；
Fig. 4 is that in the embodiment of the present invention, resistive touch screen detects some coordinate method flow charts.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
With reference to shown in Fig. 2, the method for the invention step may be summarized to be:
1, two touch points of described resistive touch screen are obtained, it is respectively the first touch point and the second touch point, constant current is provided to the first resistive layer, first resistive layer two ends on the direction of distribution of resistance are respectively the first high-pressure stage and the first low pressure pole, and constant current is flowed to the first low pressure pole by the first high-pressure stage；
2, utilize voltameter to measure the first high-pressure stage and the magnitude of voltage of the first low pressure pole of the first resistive layer, and calculate the difference of magnitude of voltage between the first high-pressure stage and the first low pressure pole, obtain the first voltage difference；
3, voltameter is utilized to measure the magnitude of voltage at each touch point, and utilize the magnitude of voltage at described first voltage difference and each touch point, calculate the voltage distributed on resistance between the first high-pressure stage and the first touch point, and the voltage distributed on resistance between the first low pressure pole and the second touch point respectively；
4, by the voltage distributed on resistance between the first high-pressure stage and the first touch point and the proportionate relationship of the first voltage difference, and first distribution on resistance between low pressure pole and the second touch point magnitude of voltage and the proportionate relationship of the first voltage difference, as the proportionate relationship of total length in this resistive linearity length and the first resistive layer distribution of resistance direction；Preset the first high-pressure stage and the coordinate figure of the first low pressure pole, and according to aforementioned proportion relation and the coordinate figure set in advance each touch point of conversion coordinate figure on the first resistive layer.
The circuit diagram showing in the specific embodiment of the method for the invention with reference to Fig. 3, the concrete structure of wherein said resistive touch screen includes: two resistive layers, current source and some voltameters, two of which resistive layer is lateral resistor layer and longitudinal electrical resistance layer respectively；
Wherein lateral resistor layer resistance transversely linear distribution, is used for obtaining touch point abscissa；The two poles of the earth of lateral resistor layer are named as p1Pole and n1Pole；And the present embodiment is assumed p1Polar value is 0, n1Polar value is 100, and the total resistance value of lateral resistor layer is 100 Ω, also just represents, and the point-to-point transmission of coordinate figure one unit of difference, resistance value is 1 Ω.
Longitudinal electrical resistance layer resistance is distributed along vertical linear, is used for obtaining touch point vertical coordinate；The two poles of the earth of longitudinal electrical resistance layer are named as p2Pole and n2Pole；And the present embodiment is assumed p2Polar value is 0, n2Polar value is 100, and the total resistance value of longitudinal electrical resistance layer is 100 Ω, also just represents, and the point-to-point transmission of coordinate figure one unit of difference, resistance value is 1 Ω.
Lateral resistor layer closes with longitudinal electrical resistance stacking and places, and two resistance interlayers exist clearance for insulation；Not touching described resistive touch screen when, due to the existence of clearance for insulation, being considered as open circuit between two resistive layers, electric current cannot circulate at two resistance interlayers；When touching described resistive touch screen, two resistive layers fit on touch location；Bonding position no longer insulate, it is possible to realize the conducting of electric current, and described bonding position is referred to as touch point.
Current source connects lateral resistor layer and longitudinal electrical resistance layer, for providing constant current to lateral resistor layer and/or longitudinal electrical resistance layer.
Voltameter connects lateral resistor layer and longitudinal electrical resistance layer, for measuring the magnitude of voltage on lateral resistor layer and/or longitudinal electrical resistance layer optional position.
The two poles of the earth of lateral resistor layer are named as p1Pole and n1Pole, the two poles of the earth of longitudinal electrical resistance layer are named as p2Pole and n2Pole, voltameter Mp1Connect p1Pole, voltameter Mn1Connect n1Pole；Two touch points are k1And k2, touch point k as shown in the figure1Ratio touch point k2Near p1Pole；Described lateral resistor layer touched point k1And k2It is divided into three sections of resistance, if p1Best touch point k1Section is resistance R1, touch point k2To n1Pole section is resistance R3, touch point k1To touch point k2Section is resistance R2；Voltameter M1Connect touch point k1, voltameter M2Connect touch point k2。
In like manner as it can be seen, longitudinal electrical resistance layer also touched point k1With touch point k2It is divided into three sections of resistance, respectively resistance R4, resistance R5, resistance R6。
Current source provides constant current to lateral resistor layer, and described constant current is by p1Pole flows to n1Pole；Touch point k1And k2Lateral resistor layer and longitudinal electrical resistance layer two parts circuit communication, lateral resistor layer and longitudinal electrical resistance layer are fitted on the position of two touch points, and electric current shunts from touch point, imports longitudinal electrical resistance layer.Can be equivalent by touch point k1And k2Circuit after connection is considered as resistance R2With resistance R5After parallel connection, then series resistance R1With resistance R3。
Voltameter Mp1Record lateral resistor layer p after shunting1Magnitude of voltage Vp1, voltameter Mn1Record longitudinal electrical resistance layer n after shunting1Magnitude of voltage Vn1；
Calculate the p after shunting1And n1Between the difference of voltage, i.e. Vp1-Vn1=Δ V1；
In the practical operation of the present embodiment, obtain, Vp1=2 volts, Vn1=1 volt, Δ V1=1 volt；
Voltameter M1Record touch point k1Magnitude of voltage Vk1, voltameter M2Record touch point k2Magnitude of voltage Vk2；
In the practical operation of the present embodiment, obtain, Vk1=1.7 volts, Vk1=1.3 volts；
Calculate resistance R1Both end voltage VR1=Vp1-Vk1=0.3 volt；Resistance R3Both end voltage VR3=Vk2-Vn1=0.3 volt；
Proportionate relationship VR1/ΔV1I.e. p1Best touch point k1The distance of section and the proportionate relationship of the horizontal total length of lateral resistor layer；Proportionate relationship VR3/ΔV1I.e. touch point k2To n1The distance of pole section and the proportionate relationship of the horizontal total length of lateral resistor layer；
Mathematical method according to ratiometric conversion coordinate figure is as follows, works as p1Polar value is xp, n1Polar value is xn, touch point k1Distance p1The distance of pole is l1, touch point k2Distance n1The distance of pole is l2, then touch point k1Coordinate figure Touch point k2Coordinate figure
Substituting into concrete numerical result in the present embodiment is: touch point k1Coordinate figure be 0+30=30, touch point k2Coordinate figure be 100-30=70, touch point k1And k2Coordinate figure on lateral resistor layer, i.e. abscissa.
In like manner, current source can be made to provide constant current to longitudinal electrical resistance layer, calculate touch point k according to the method described above1And k2Coordinate figure on longitudinal electrical resistance layer, i.e. vertical coordinate；
Described abscissa and vertical coordinate collectively form touch point coordinate figure in resistive touch screen.
It addition, in the embodiment shown in fig. 3, further comprises the method judging that touch point quantity is one or two, particularly as follows:
On the premise of not touching described resistive touch screen, voltameter Mp1Record the lateral resistor layer p not applying touch point1The magnitude of voltage V of polep0, voltameter Mn1Record the longitudinal electrical resistance layer n not applying touch point1The magnitude of voltage V of polen0；
Calculate the p not applying touch point1Pole and n1The difference of the voltage between pole, i.e. Vp0-Vn0=Δ V0；
In the practical operation of the present embodiment, obtain, Vp0=2 volts, Vn0=0.5 volt, Δ V0=1.5 volts；
When applying touch point at described resistive touch screen, voltameter Mp1Record the lateral resistor layer p after applying touch point1The magnitude of voltage V ' of polep0, voltameter Mn1Record the longitudinal electrical resistance layer n after applying touch point1The magnitude of voltage V ' of polen0；
Calculate the p after applying touch point1Pole and n1The difference of the voltage between pole, i.e. V 'p0-V′n0=Δ V '0
On the premise of not touching described resistive touch screen, p1Best n1Between pole, all-in resistance is 100 Ω.
When there is a touch point in touch screen, p1Best n1Between pole, all-in resistance is similarly 100 Ω, does not change, so applying the p behind a touch point1Pole and n1The difference of the voltage between pole does not changes, i.e. Δ V0Equal to Δ V '0。
When touch screen exists two touch points, then the equivalent circuit diagram of touch screen and the circuit of embodiment illustrated in fig. 3 are completely the same, are resistance R2With resistance R5After parallel connection, then series resistance R1With resistance R3.Resistance R is understood according to connection in series-parallel relation2With resistance R5Resistance after parallel connection is less than resistance R2Self-resistance, so in the case of applying two touch points, p1Best n1Between pole, all-in resistance is less than 100 Ω.According to ohm law, owing to current source provides constant current, in the case of all-in resistance reduces, p1Best n1The difference of the voltage between pole reduces, i.e. Δ V0More than Δ V '0。
So Δ V only need to be compared0With Δ V '0, as Δ V0Equal to Δ V '0, it is determined that touch point quantity is one, as Δ V0More than Δ V '0, it is determined that touch point quantity is two.
To judging that the embodiment of the method that touch point quantity is one or more expands again, according to Fig. 4, it is also possible to obtain an embodiment of the method further, in the case of calculating a touch point, the coordinate figure of this touch point, particularly as follows:
When determining that touch point quantity is one, this touch point is ka, described lateral resistor layer is by kaIt is divided into two sections of resistance, if p1Best touch point kaSection is resistance Ra, touch point kaTo n1Pole section is resistance Rb；Voltameter MaConnect touch point ka；
Voltameter MaRecord touch point kaMagnitude of voltage Vka, calculate resistance RaBoth end voltage VRa=Vp0-Vka；Proportionate relationship VRa/ΔV0I.e. p1Best touch point kaThe distance of section and the proportionate relationship of the horizontal total length of lateral resistor layer；K is calculated according to aforementioned proportion relationaCoordinate figure on lateral resistor layer, i.e. abscissa；Wherein to be converted into mode disclosed in the mode of coordinate and embodiment illustrated in fig. 2 consistent for proportionate relationship.
In like manner, current source can be made to provide constant current to longitudinal electrical resistance layer, calculate k according to the method described aboveaCoordinate figure on longitudinal electrical resistance layer, i.e. vertical coordinate；
Described abscissa and vertical coordinate collectively form touch point coordinate figure in resistive touch screen.
Method described in corresponding above-described embodiment, what the present invention was corresponding discloses a kind of resistive touch screen, particularly as follows:
Described touch screen includes: constant current source, the first resistive layer, the second resistive layer, voltage check device and processor；
Constant current source, for providing constant current to the first resistive layer and/or the second resistive layer；
First resistive layer and the second resistive layer, resistance is uniformly distributed in one direction, and described first resistive layer and the second resistive layer overlapping are placed, and distribution of resistance direction is orthogonal, and two resistance interlayers exist clearance for insulation, and clearance for insulation is fitted at touch point and turns on electric current；First resistive layer two ends along the direction of distribution of resistance are respectively the first high-pressure stage and the first low pressure pole, second resistive layer two ends along the direction of distribution of resistance are respectively the second high-pressure stage and the second low pressure pole, preset the first high-pressure stage, the first low pressure pole, the second high-pressure stage and the coordinate figure of the second low pressure pole；
Voltage check device, including some voltameters, for measuring the magnitude of voltage of each point on the first resistive layer and/or the second resistive layer；
Processor, for obtaining two touch points of described resistive touch screen, control constant current source and provide constant current to the first resistive layer, and command voltage detects the first high-pressure stage and the voltage of the first low pressure pole of measurement device the first resistive layer, and the voltage of two touch points；Processor obtains the magnitude of voltage at described first high-pressure stage and the voltage of the first low pressure pole and two touch points, using the voltage difference between the first high-pressure stage and the first low pressure pole as the first voltage difference, calculate the voltage distributed on resistance between the first high-pressure stage and the first touch point, and the voltage distributed on resistance between the first low pressure pole and the second touch point；By the voltage distributed on resistance between the first high-pressure stage and the first touch point and the proportionate relationship of the first voltage difference, and first distribution on resistance between low pressure pole and the second touch point magnitude of voltage and the proportionate relationship of the first voltage difference, as the proportionate relationship of total length in this resistive linearity length and the first resistive layer distribution of resistance direction；According to aforementioned proportion relation and the coordinate figure set in advance each touch point of conversion coordinate figure on the first resistive layer.
Processor is additionally operable to control constant current source and provides constant current to the second resistive layer, and command voltage detects the second high-pressure stage and the voltage of the second low pressure pole of measurement device the second resistive layer, and the voltage of two touch points；Processor obtains the magnitude of voltage at described second high-pressure stage and the voltage of the second low pressure pole and two touch points, using the voltage difference between the second high-pressure stage and the second low pressure pole as the second voltage difference, calculate the voltage distributed on resistance between the second high-pressure stage and the first touch point, and the voltage distributed on resistance between the second low pressure pole and the second touch point；By the voltage distributed on resistance between the second high-pressure stage and the first touch point and the proportionate relationship of the second voltage difference, and second distribution on resistance between low pressure pole and the second touch point magnitude of voltage and the proportionate relationship of the second voltage difference, as the proportionate relationship of total length in this resistive linearity length and the second resistive layer distribution of resistance direction；According to aforementioned proportion relation and the coordinate figure set in advance each touch point of conversion coordinate figure on the second resistive layer.
Processor calculates the voltage distributed on resistance between the first high-pressure stage and the first touch point, and first the voltage of distribution on resistance between low pressure pole and the second touch point be specially, it is high section resistance that processor takes first one section, high pressure best the first touch point resistance, and taking first one section, low pressure best the second touch point resistance is low section of resistance；It is the first magnitude of voltage that processor takes the magnitude of voltage of the first touch point, and the magnitude of voltage taking the second touch point is the second magnitude of voltage；The magnitude of voltage utilizing the first high-pressure stage subtracts the first, and magnitude of voltage obtains high section resistance both end voltage；The magnitude of voltage utilizing the second magnitude of voltage low pressure pole that subtracts the first obtains low-side resistor both end voltage.
Processor obtains two touch points of resistive touch screen and is specially, processor instruction voltage check device is measured respectively does not has first resistive layer the first high-pressure stage and the voltage difference of the first low pressure pole in the case of touch point, and first resistive layer the first high-pressure stage and the voltage difference of the first low pressure pole on the premise of there is one or two touch point；
Processor obtains does not has the voltage difference of the first high-pressure stage and the first low pressure pole in the case of touch point poor as primary voltage, obtain the voltage difference of the first high-pressure stage and the first low pressure pole on the premise of there is one or two touch point the poorest, it is poor with reference voltage that processor compares primary voltage difference, when poor equal to primary voltage with reference to voltage difference numerical value, then determine that touch point quantity is one, when poor less than primary voltage with reference to voltage difference numerical value, it is determined that touch point quantity is two.
Accordingly, described processor is additionally operable to calculate the coordinate figure of touch point in the case of touch point quantity is, particularly as follows: the magnitude of voltage at this touch point measured by processor instruction voltameter, processor obtains the magnitude of voltage at described primary voltage difference and this touch point, calculates the magnitude of voltage that the two sections of resistance being divided into by this touch point on the first resistive layer each distributes；Processor using the proportionate relationship of magnitude of voltage and the primary voltage difference of distribution on two sections of resistance as the proportionate relationship of this resistive linearity length Yu resistive layer distribution of resistance direction total length；And convert this touch point coordinate figure on the first resistive layer according to the coordinate figure of aforementioned proportion relation and the first high-pressure stage set in advance and the first low pressure pole.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (8)
1. a resistive touch screen detected touch point sits calibration method, it is characterised in that described touch screen
Including, the first resistive layer, the second resistive layer and some voltameters；Described first resistive layer and the second resistance
Resistance on layer is uniformly distributed in one direction；First resistive layer and the second resistive layer overlapping are placed and the two
Distribution of resistance direction orthogonal；There is clearance for insulation in two resistance interlayers, clearance for insulation pastes at touch point
Merge conducting electric current, described method particularly as follows:
A, obtaining two touch points of described resistive touch screen, the respectively first touch point and second touches
Point, provides constant current to the first resistive layer, and first resistive layer two ends on the direction of distribution of resistance are divided
Not being the first high-pressure stage and the first low pressure pole, constant current is flowed to the first low pressure pole by the first high-pressure stage；
B, voltameter is utilized to measure the first high-pressure stage and the magnitude of voltage of the first low pressure pole of the first resistive layer, and
Calculate the difference of magnitude of voltage between the first high-pressure stage and the first low pressure pole, obtain the first voltage difference；
C, utilize voltameter to measure the magnitude of voltage at each touch point, and utilize described first voltage difference to touch with each
A magnitude of voltage at touching, calculates between the first high-pressure stage and the first touch point the voltage of distribution on resistance respectively,
And first voltage of distribution on resistance between low pressure pole and the second touch point；
D, by resistance between the first high-pressure stage and the first touch point distribution voltage and the ratio of the first voltage difference
The magnitude of voltage distributed on resistance between example relation, and the first low pressure pole and the second touch point and the first voltage difference
Proportionate relationship, as this resistive linearity length and the ratio of total length on the first resistive layer distribution of resistance direction
Example relation；Preset the first high-pressure stage and the coordinate figure of the first low pressure pole, and according to aforementioned proportion relation
With the coordinate figure set in advance each touch point of conversion coordinate figure on the first resistive layer；
Wherein, described first one section, high pressure best the first touch point resistance is high section resistance, the first low pressure pole
Be low section of resistance to one section, the second touch point resistance, the most described step C particularly as follows:
C1, the magnitude of voltage that utilizes voltameter to record the first touch point be the first magnitude of voltage, record the second touch
The magnitude of voltage of point is the second magnitude of voltage；The magnitude of voltage utilizing the first high-pressure stage subtracts the first, and magnitude of voltage obtains high section
Resistance both end voltage；The magnitude of voltage utilizing the second magnitude of voltage low pressure pole that subtracts the first obtains low-side resistor two ends electricity
Pressure.
Method the most according to claim 1, it is characterised in that described method also includes:
F, to second resistive layer provide constant current, second resistive layer two ends on the direction of distribution of resistance
Being respectively the second high-pressure stage and the second low pressure pole, constant current is flowed to the second low pressure pole by the second high-pressure stage；
G, utilize voltameter to measure the second high-pressure stage and the magnitude of voltage of the second low pressure pole, and calculate the second high pressure
Between pole and the second low pressure pole, the difference of magnitude of voltage, obtains the second voltage difference；
H, utilize voltameter to measure the magnitude of voltage at each touch point, and utilize described second voltage difference to touch with each
A magnitude of voltage at touching, calculates between the second high-pressure stage and the first touch point the voltage of distribution on resistance respectively,
And second voltage of distribution on resistance between low pressure pole and the second touch point；
I, by resistance between the second high-pressure stage and the first touch point distribution voltage and the ratio of the second voltage difference
The magnitude of voltage distributed on resistance between example relation, and the second low pressure pole and the second touch point and the second voltage difference
Proportionate relationship, as this resistive linearity length and the ratio of total length on the second resistive layer distribution of resistance direction
Example relation；Preset the second high-pressure stage and the coordinate figure of the second low pressure pole, and according to aforementioned proportion relation
With the coordinate figure set in advance each touch point of conversion coordinate figure on the second resistive layer.
Method the most according to claim 1, it is characterised in that the described resistive touch screen of described acquisition
Two touch points particularly as follows:
S1, there is no touch point on the touchscreen in the case of, to first resistive layer provide constant current, constant
Electric current is flowed to the first low pressure pole by the first high-pressure stage；
S2, measure and there is no the first high-pressure stage and the magnitude of voltage of the first low pressure pole in the case of touch point, and calculate
There is no in the case of touch point the difference of magnitude of voltage between the first high-pressure stage and the first low pressure pole, obtain original
Voltage difference；
S3, exist on the premise of one or two touch point, measure the first high-pressure stage and the first low pressure pole
Magnitude of voltage, and calculate exist on the premise of the touch point that quantity is unknown first high-pressure stage and the first low pressure pole it
Between the difference of magnitude of voltage, obtain reference voltage poor；
S4, comparison reference voltage difference with primary voltage poor, when with reference to voltage difference numerical value be equal to primary voltage poor,
Then determine that touch point quantity is one, when poor less than primary voltage with reference to voltage difference numerical value, it is determined that touch
Point quantity is two.
Method the most according to claim 3, it is characterised in that after determining that touch point quantity is one,
The most described touch point is one-touch point, and described method also includes:
T1, utilize voltameter to measure the magnitude of voltage at one-touch point, described one-touch o'clock is by the first resistive layer
It is divided into two sections of resistance, utilizes the magnitude of voltage at described primary voltage difference and one-touch point, calculate the respectively
The magnitude of voltage of distribution on two sections of resistance every section resistance on one resistive layer；
T2, using the proportionate relationship of magnitude of voltage and the primary voltage difference of distribution on two sections of resistance as this resistive conductor
Property length and the first resistive layer distribution of resistance direction total length proportionate relationship；Preset the first high-pressure stage
With the coordinate figure of the first low pressure pole, and convert single-tap according to aforementioned proportion relation and coordinate figure set in advance
Touch the coordinate figure o'clock on the first resistive layer.
5. a resistive touch screen, it is characterised in that described touch screen includes, constant current source,
One resistive layer, the second resistive layer, voltage check device and processor, particularly as follows:
Constant current source, for providing constant current to the first resistive layer and/or the second resistive layer；
First resistive layer and the second resistive layer, resistance is uniformly distributed in one direction, described first resistive layer
Placing with the second resistive layer overlapping, and distribution of resistance direction is orthogonal, there is clearance for insulation in two resistance interlayers,
Clearance for insulation is fitted at touch point and turns on electric current；First resistive layer along the direction of distribution of resistance two
End is respectively the first high-pressure stage and the first low pressure pole, second resistive layer two ends along the direction of distribution of resistance
Be respectively the second high-pressure stage and the second low pressure pole, preset the first high-pressure stage, the first low pressure pole, second
High-pressure stage and the coordinate figure of the second low pressure pole；
Voltage check device, including some voltameters, for measuring the first resistive layer and/or the second resistive layer
The magnitude of voltage of upper each point；
Processor, for obtaining two touch points of described resistive touch screen, control constant current source to
First resistive layer provides constant current, and the first high pressure of command voltage detection measurement device the first resistive layer
Pole and the voltage of the first low pressure pole, and the voltage of two touch points；Processor obtains described first high-pressure stage
With the magnitude of voltage at the voltage of the first low pressure pole and two touch points, by the first high-pressure stage and the first low pressure pole
Between voltage difference as the first voltage difference, calculate between the first high-pressure stage and the first touch point on resistance point
The voltage of distribution on resistance between the voltage joined, and the first low pressure pole and the second touch point；By the first high pressure
The voltage of distribution and the proportionate relationship of the first voltage difference on resistance between pole and the first touch point, and first is low
The magnitude of voltage distributed on resistance between pressure pole and the second touch point and the proportionate relationship of the first voltage difference, as
This resistive linearity length and the proportionate relationship of total length on the first resistive layer distribution of resistance direction；According to above-mentioned
Proportionate relationship and the coordinate figure set in advance each touch point of conversion coordinate figure on the first resistive layer；
Wherein, described processor calculates the voltage distributed on resistance between the first high-pressure stage and the first touch point,
And first distribution on resistance between low pressure pole and the second touch point voltage particularly as follows:
It is high section resistance that processor takes first one section, high pressure best the first touch point resistance, takes the first low pressure pole
It is low section of resistance to one section, the second touch point resistance；It is the first electricity that processor takes the magnitude of voltage of the first touch point
Pressure value, the magnitude of voltage taking the second touch point is the second magnitude of voltage；The magnitude of voltage utilizing the first high-pressure stage subtracts the
One magnitude of voltage obtains high section resistance both end voltage；The magnitude of voltage utilizing the second magnitude of voltage low pressure pole that subtracts the first obtains
To low-side resistor both end voltage.
Touch screen the most according to claim 5, it is characterised in that described processor is additionally operable to:
Control constant current source and provide constant current, and command voltage detection measurement device to the second resistive layer
Second high-pressure stage of the second resistive layer and the voltage of the second low pressure pole, and the voltage of two touch points；Process
Device obtains the magnitude of voltage at described second high-pressure stage and the voltage of the second low pressure pole and two touch points, by the
Voltage difference between two high-pressure stages and the second low pressure pole, as the second voltage difference, calculates the second high-pressure stage and
The voltage of distribution on resistance between one touch point, and divide on resistance between the second low pressure pole and the second touch point
The voltage joined；By the voltage distributed on resistance between the second high-pressure stage and the first touch point and the second voltage difference
Proportionate relationship, and between the second low pressure pole and the second touch point, on resistance, the magnitude of voltage of distribution is electric with second
The proportionate relationship of pressure reduction, as this resistive linearity length and total length on the second resistive layer distribution of resistance direction
Proportionate relationship；Convert each touch point second according to aforementioned proportion relation and coordinate figure set in advance
Coordinate figure on resistive layer.
Touch screen the most according to claim 5, it is characterised in that described processor obtains resistance-type and touches
Touch two touch points of screen particularly as follows:
It is high that processor instruction voltage check device measures the first resistive layer first in the case of not having touch point respectively
Pressure pole and the voltage difference of the first low pressure pole, and the first resistance on the premise of there is one or two touch point
Layer the first high-pressure stage and the voltage difference of the first low pressure pole；
Processor obtains does not has in the case of touch point the voltage difference of the first high-pressure stage and the first low pressure pole as former
Beginning voltage difference, obtains the first high-pressure stage and the first low pressure pole on the premise of there is one or two touch point
Voltage difference the poorest, it is poor with reference voltage that processor compares primary voltage difference, when with reference to electric
Pressure drop is poor equal to primary voltage, it is determined that touch point quantity is one, when little with reference to voltage difference numerical value
Poor in primary voltage, it is determined that touch point quantity is two.
Touch screen the most according to claim 7, it is characterised in that described processor is additionally operable to calculate and touches
Touch the coordinate figure of touch point in the case of a quantity is, particularly as follows:
The magnitude of voltage at this touch point measured by processor instruction voltameter, and processor obtains described primary voltage
Magnitude of voltage at difference and this touch point, calculates the two sections of resistance being divided into by this touch point on the first resistive layer
Each magnitude of voltage of distribution；Processor is by the ratio of the magnitude of voltage of distribution on two sections of resistance with primary voltage difference
Relation is as the proportionate relationship of this resistive linearity length Yu resistive layer distribution of resistance direction total length；And according to
The coordinate figure of aforementioned proportion relation and the first high-pressure stage set in advance and the first low pressure pole converts this touch point
Coordinate figure on the first resistive layer.
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| CN101271375A (en) * | 2008-05-19 | 2008-09-24 | 北京中星微电子有限公司 | Method and device for detecting touch panel |
| WO2011001224A1 (en) * | 2009-06-29 | 2011-01-06 | Freescale Semiconductor, Inc. | Touch-screen interface circuit |
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