CN102033674A - Two-point detection method and equipment for resistive touch screen - Google Patents
Two-point detection method and equipment for resistive touch screen Download PDFInfo
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- CN102033674A CN102033674A CN2009100579507A CN200910057950A CN102033674A CN 102033674 A CN102033674 A CN 102033674A CN 2009100579507 A CN2009100579507 A CN 2009100579507A CN 200910057950 A CN200910057950 A CN 200910057950A CN 102033674 A CN102033674 A CN 102033674A
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Abstract
The invention relates to a touch screen technique and discloses a two-point detection method and two-point detection equipment for a resistive touch screen. The two-point detection method comprises the following steps of: measuring voltage values VADC1_0, VADC1_1, VADC2_0 and VADC2_1 at the series resistor end by using series resistors; and if a difference value delta Vy of the VADC1_1 and the VADC1_0 is more than or equal to VTy which is a first preset threshold, or if a difference value delta Vx of the VADC2_1 and the VADC2_0 is more than or equal to VTx which is a second preset threshold, detecting that two points are pressed down, so that the problem that the resistive touch screen cannot perform multi-point detection is solved and the application to software operation can be enriched.
Description
Technical field
The present invention relates to touch screen technology, particularly the multiple spot detection technique of resistive touch screen.
Background technology
Along with the continuous development of science and technology, touch-screen is existing in our daily life to be used widely, can be the United States Patent (USP) of " 6072475 " referring to the patent No. about the technology of touch-screen.Touch-screen mainly contains several types at present, is respectively: resistance-type, condenser type (surface capacitance type and inductance capacitance formula), surface acoustic wave type, infrared type, flexural wave formula, active digital converter formula and optical imagery formula.Wherein, resistive touch screen is controlled by utilizing pressure sensitive.Capacitive touch screen carries out work by the induction by current that utilizes human body.The infrared-type touch-screen is to utilize the infrared ray matrix that gathers on X, the Y direction to detect the also touch of consumer positioning.Surface acoustic wave is hyperacoustic a kind of, at the mechanical energy ripple of the surperficial shallow-layer propagation of medium (for example rigid material such as glass or metal).By wedge shape tribrach (according to the strict design of the wavelength of surface wave), can accomplish orientation, the emission of low-angle surface acoustic wave energy.Principle of work at resistive touch screen is introduced below.
The screen body portion of resistive touch screen by one deck glass or organic glass as basic unit, the surface scribbles the conductive layer of layer of transparent, be stamped one deck outside surface cure process, smooth scratch resistant plastic layer above again, its inside surface also scribbles the layer of transparent conductive layer, has many tiny transparent isolating points that they are separated insulation between two conductive layers.When the finger touch screen, the two conductive layers of usual mutually insulated has just had a contact in the position, touch point, when the y direction of principal axis of one deck conductive layer therein adds electric field, simultaneously in another layer conductive layer x direction of principal axis test voltage, gained voltage is the y axial coordinate after changing (digital-to-analog conversion) through A/D, in like manner can record the x axial coordinate, as shown in Figure 1.
Yet the present inventor finds, in present resistive touch screen, can only realize a bit detecting, and can't realize that multiple spot detects.And in actual applications, many softwares (especially game class software) often need be at the basic enterprising line operate that can realize that multiple spot detects, and, can realize that the touch-screen that multiple spot detects can improve user's touch sense organ greatly.At present,, some capacitive touch screen detects though can realizing multiple spot, the cost height of capacitive touch screen, and compared to resistive touch screen, its price is more expensive.
Summary of the invention
The object of the present invention is to provide a kind of resistive touch screen two point detecting methods and equipment, make resistive touch screen can realize 2 detections.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of resistive touch screen two point detecting methods, comprise following steps:
Calculate the magnitude of voltage V of each resistance in series end when y axle, x axle added electric field respectively
ADC1_0, V
ADC1_1, V
ADC2_0, V
ADC2_1, V wherein
ADC1_0When not having a little to press at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V
ADC1_1When pressing a little at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V in like manner
ADC2_0, V
ADC2_1Be respectively when not having a little to press and press a little magnitude of voltage at the x axle resistance in series end of x axle added electric field.If V
ADC1_1, V
ADC1_0Difference DELTA V
yPreset thresholding V more than or equal to first
Ty, perhaps V
ADC2_1, V
ADC2_0Difference DELTA V
xPreset thresholding V more than or equal to second
Tx, then judging has be pressed at 2 on the resistive touch screen.
Embodiments of the present invention also provide a kind of equipment, comprise resistive touch screen, it is characterized in that, equipment also comprises:
Computing unit is used for calculating respectively resistance in series terminal voltage value V when y axle, x axle added electric field
ADC1_0, V
ADC1_1, V
ADC2_0, V
ADC2_1, V wherein
ADC1_0When not having a little to press at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V
ADC1_1When pressing a little at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V in like manner
ADC2_0, V
ADC2_1Be respectively when not having a little to press and press a little magnitude of voltage at the x axle resistance in series end of x axle added electric field;
Judging unit is used to judge V
ADC1_1, V
ADC1_0Difference DELTA V
yWhether preset thresholding V more than or equal to first
Ty, V
ADC2_1, V
ADC2_0Difference DELTA V
xWhether preset thresholding V more than or equal to second
Tx
Detecting unit is used for judging V at judging unit
ADC1_1, V
ADC1_0Difference DELTA V
yPreset thresholding V more than or equal to first
Ty, perhaps V
ADC2_1, V
ADC2_0Difference DELTA V
xPreset thresholding V more than or equal to second
TxThe time, judging on the resistive touch screen has be pressed at 2.
Embodiment of the present invention compared with prior art, the key distinction and effect thereof are:
By simple resistance in series, calculate resistance in series terminal voltage value V when y axle, x axle added electric field
ADC1_0, V
ADC1_1, V
ADC2_0, V
ADC2_1If, V
ADC1_1, V
ADC1_0Difference DELTA V
ySatisfy Δ V
y〉=V
Ty(V
TyBe first to preset thresholding), perhaps V
ADC2_1, V
ADC2_0Difference DELTA V
xSatisfy Δ V
x〉=V
Tx(V
TxBe second to preset thresholding), then detected at 2 and be pressed, solve the problem that resistive touch screen can not multiple spot detects, thereby can realize the application in more software operations.
Further, detect have be pressed on the described resistive touch screen at 2 after, can also detect 2 of being pressed and whether have relative motion trend.Because 2 relative motion trend are more useful in actual applications, after 2 that pin on the picture of screen displaying, outwards slide (promptly press 2 away from) then can make picture amplify such as the user, and inwardly slip then can make picture dwindle.Whether therefore, detect 2 of being pressed exists relative motion trend can realize application in some software operations more conveniently.Make resistive touch screen also can reach the same multiple spot slip of similar capacitive touch screen and detect, improve the user and touch sense organ, realize low-cost high-quality enjoyment.
Further, according to V
ADC1_1Or V
ADC2_1Be and become the megatrend or the trend that diminishes, 2 the relative motion trend that judgement is pressed.Owing to can pass through formula identity V
ADC1_1With | y1-y2| monotone increasing (y1, y2 are 2 upright position), V
ADC2_1With | x1-x2| monotone increasing (x1, x2 are 2 horizontal level), therefore according to V
ADC1_1Or V
ADC2_1Be the change megatrend or the trend that diminishes and judge, guaranteed the judgment accuracy of relative motion trend.
Further, be used for calculating voltage value V
ADC1_0, V
ADC1_1Resistance R 1 be used for calculating voltage value V
ADC2_0, V
ADC2_1Resistance R 2, recommend value 100ohm.Because the resistance of R1, R2 will have influence on the effect of 2 detections, such as, if the resistance of R1, R2 too greatly then will reduce the coordinate dynamic range, too little then will to 2 press the reflection insensitive, by actual test to many moneys touch-screen, R1, when R2 is set at 100ohm, desirable preferably 2 detect effects.
Description of drawings
Fig. 1 is the principle of work synoptic diagram that a bit detects of resistive touch screen in the prior art;
Fig. 2 is the resistive touch screen two point detecting method process flow diagrams according to first embodiment of the invention;
Fig. 3 distributes synoptic diagram according to the touch-screen resistance in the first embodiment of the invention;
Fig. 4 is the state exchange synoptic diagram according to the resistive touch screen in the first embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each embodiment, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
First embodiment of the invention relates to a kind of resistive touch screen two point detecting methods, and idiographic flow as shown in Figure 2.
In step 210, calculate resistance in series terminal voltage value V when y axle, x axle added electric field respectively
ADC1_0, V
ADC1_1, V
ADC2_0, V
ADC2_1, V wherein
ADC1_0When not having a little to press at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V
ADC1_1When pressing a little at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V in like manner
ADC2_0, V
ADC2_1Be respectively when not having a little to press and press a little magnitude of voltage at the x axle resistance in series end of x axle added electric field.Specifically, touch-screen resistance distributes (the resistance allocation scheme of this touch-screen is same as the prior art, does not repeat them here) as shown in Figure 3, supposes that touch-screen y axle all-in resistance is Ry, and x axle all-in resistance is that Rx. is divided into following three classes with 2 relative positions:
A, 2 at same upright position, i.e. x1=x2;
B, 2 at same horizontal level, i.e. y1=y2;
C, 2 simultaneously at horizontal or vertical position, i.e. x1 ≠ x2﹠amp; Y1 ≠ y2.
At first (YU=VDD YD=GND), does not put or has only any to be pressed then V if having at y axle added electric field
ADC1_0=VDD*R1/ (R1+Ry), in like manner (XL=VDD XR=GND) can get V at x axle added electric field
ADC2_0=VDD*R2/ (R2+Rx).If have 2 press simultaneously and y1 ≠ y2 promptly 2 distribute according to as shown in Figure 3 touch-screen resistance not at horizontal level, establish Rc=Rz1+Rx2+Rz2, then V
ADC1_1=VDD*R1/[(R1+ (Ry1+Ry2//Rc+Ry3)], if these 2 to be in horizontal level be y1=y2, then in like manner can calculate V
ADC2_1
Then, in step 220, judge V
ADC1_1, V
ADC1_0Difference DELTA V
yWhether preset thresholding V more than or equal to first
Ty, V
ADC2_1, V
ADC2_0Difference DELTA V
xWhether preset thresholding V more than or equal to second
TxIf Δ V
y〉=V
Ty, perhaps Δ V
x〉=V
Tx, then judging has be pressed at 2 on the resistive touch screen.
Specifically, because Ry=Ry1+Ry2+Ry3, (Ry1+Ry2//Rc+Ry3) must be less than Ry, so Δ V is arranged as can be known according to the parallel resistance characteristic
y=V
ADC1_1-V
ADC1_0＞0, similarly, Δ V
x=V
ADC2_1-V
ADC2_0＞0.Therefore, by suitable thresholding V is set
TyAnd V
TxIf Δ V satisfies condition
y〉=V
TyPerhaps Δ V
x〉=V
Tx, then can determine has be pressed at 2 on the resistive touch screen.If do not satisfy condition Δ V
y〉=V
TyPerhaps Δ V
x〉=V
Tx, then judging does not have be pressed process ends at 2 on the resistive touch screen.
By utilizing the resistance in series in the resistive touch screen, calculate the magnitude of voltage V of resistance in series end when y axle, x axle added electric field
ADC1_0, V
ADC1_1, V
ADC2_0, V
ADC2_1If, V
ADC1_1, V
ADC1_0Difference DELTA V
ySatisfy Δ V
y〉=V
Ty(V
TyBe first to preset thresholding), perhaps V
ADC2_1, V
ADC2_0Difference DELTA V
xSatisfy Δ V
x〉=V
Tx(V
TxBe second to preset thresholding), then detected at 2 and be pressed, solve the problem that resistive touch screen can not multiple spot detects, thereby can realize the application in more software operations, improved user's touch sense organ greatly.If neither satisfy condition Δ V
y〉=V
Ty, Δ V does not satisfy condition yet
x〉=V
Tx, then explanation has only any to be pressed.
What deserves to be mentioned is, to being used for calculating voltage value V
ADC1_0, V
ADC1_1Resistance R 1 be used for calculating voltage value V
ADC2_0, V
ADC2_1Resistance R 2 because the resistance of R1, R2 will have influence on the effect of 2 detections, such as, if the resistance of R1, R2 too greatly then will reduce the coordinate dynamic range, too little then will to press reflection to 2 insensitive, by the actual test to many moneys touch-screen, recommends R1=R2=100ohm.Certainly, R1 can do suitable adjustment according to different touch-screen resistance characteristics with R2, is meant that herein recommending value for resistive touch screen commonly used is 100ohm.
In addition, be appreciated that resistance R 1, R2 also can get the value that other can satisfy the demands.
In addition, step 210 can also have various variation examples with step 220.Such as, resistance in series terminal voltage value V when only calculating y axle added electric field earlier
ADC1_0, V
ADC1_1, judge V
ADC1_1, V
ADC1_0Difference DELTA V
yWhether preset thresholding V more than or equal to first
TyIf Δ V has satisfied condition
y〉=V
Ty, then can directly judge has be pressed at 2 on the resistive touch screen.If do not satisfy condition Δ V
y〉=V
Ty, then, record V more further at x axle added electric field
ADC2_0, V
ADC2_1, Δ V judges whether to satisfy condition
x〉=V
TxSimilarly, the magnitude of voltage V of 2 contact points of conductive layer in the time of also may only calculating x axle added electric field earlier
ADC2_0, V
ADC2_1, judge V
ADC2_1, V
ADC2_0Difference DELTA V
xWhether preset thresholding V more than or equal to first
TxIf Δ V has satisfied condition
x〉=V
Tx, then can directly judge has be pressed at 2 on the resistive touch screen.If do not satisfy condition Δ V
x〉=V
Tx, then, record V more further at y axle added electric field
ADC1_0, V
ADC1_1, Δ V judges whether to satisfy condition
y〉=V
Ty
Have be pressed on the resistive touch screen at 2 if detect, then enter step 230, detect 2 the relative motion trend that is pressed.Detect have be pressed on the resistive touch screen at 2 after, can also detect 2 of being pressed and whether have relative motion trend.Because 2 relative motion trend are more useful in actual applications, after 2 that pin on the picture of screen displaying, outwards slide (promptly press 2 away from) then can make picture amplify such as the user, and inwardly slip then can make picture dwindle.Whether therefore, detect 2 of being pressed exists relative motion trend can realize application in some software operations more conveniently.Make resistive touch screen also can reach the same multiple spot slip of similar capacitive touch screen and detect, improve the user and touch sense organ, realize low-cost high-quality enjoyment.
In this step, can be according to V
ADC1_1Or V
ADC2_1Be and become the megatrend or the trend that diminishes, 2 the relative motion trend that judgement is pressed.Such as, if V
ADC1_1Or V
ADC2_1Be the trend that diminishes, then judge be pressed 2 close; If V
ADC1_1Or V
ADC2_1Be the change megatrend, then judge 2 of being pressed away from; If V
ADC1_1And V
ADC2_1Both be not the trend that diminishes, be not the change megatrend yet, judged then that there was not relative motion trend in 2 of being pressed.
Specifically, because V
ADC1_1=VDD*R1/[(R1+ (Ry1+Ry2//Rc+Ry3)]=VDD*R1/[(R1+Ry-Ry2+Ry2//Rc], establish Ry2//Rc=σ Ry2 (σ＜1).In addition, by the conductive layer characteristic (p: conductive layer body resistivity of Ry2=p*|y1-y2|/(h*W) as can be known; H: conductive layer thickness; W: the conductive layer width) be proportional to | y1-y2|, establish Ry2=K|y1-y2| (K=p/h*w); V then
ADC1_1=VDD*R1/[R1+Ry-Ry2+Ry2//Rc]=VDD*R1/[R1+Ry-Ry2+ σ Ry2]
＝VDD＊R1/[R1+Ry+(σ-1])Ry2]
＝VDD＊R1/[R1+Ry+(σ-1])K|y1-y2|]
Because σ＜1, K＞0 and be constant then can be easy to prove V
ADC1_1With | the y1-y2| monotone increasing.Same method can prove V
ADC2_1With | the x1-x2| monotone increasing.Therefore, work as V
ADC1_1Or V
ADC2_1Be become megatrend then illustrate 2 away from, be the trend that diminishes and then illustrate at 2 close.If V
ADC1_1And V
ADC2_1Both be not the trend that diminishes, and be not the change megatrend yet, then there is not relative motion trend in explanation be pressed 2.
Owing to can pass through formula identity V
ADC1_1With | y1-y2| monotone increasing (y1, y2 are 2 upright position), V
ADC2_1With | x1-x2| monotone increasing (x1, x2 are 2 horizontal level), therefore according to V
ADC1_1Or V
ADC2_1Be the change megatrend or the trend that diminishes and judge, guaranteed the judgment accuracy of relative motion trend.
Need to prove that contact resistance Rz is to Δ V
yOr Δ V
xInfluence very big, the Δ V if contact resistance is very big
yOr Δ V
xVariation will be very trickle.Suppose V
Ty=20mV, Ry=1000ohm, R1=100ohm, VDD=2.8V then will detect at 2 and press and require Rz＜10Kohm, and this is a limiting case, wishes in the practical application that Rz is the smaller the better, and therefore suggestion uses finger as 2 touch tool.
In the present embodiment, touch-screen can be divided into following different state:
State1: touch-screen free time;
State2: have any to press;
State3: have press at 2;
Each state transitions relation as shown in Figure 4.If be not activated 2 detection mechanism is that touch-screen only changes between state1 and state2 back and forth, and its working method is same as the prior art, does not repeat them here.Detect mechanism if started at 2, then each sampling all will be measured V
x(x axle making alive ADC1 measuring voltage, i.e. x coordinate), V
Yy(y axle making alive ADC1 measuring voltage), V
y(y axle making alive ADC2 measuring voltage, i.e. y coordinate), V
Xx(x axle making alive ADC2 measuring voltage) establishes Δ V
Yy=V
Yy-V
Yy0, Δ V
Xx=V
Xx-V
Xx0, wherein, V
Yy0Y axle making alive ADC1 measuring voltage when pressing for not putting, V
Xx0X axle making alive ADC2 measuring voltage when pressing for not putting.The condition that shifts between each state is as follows: (supposing that it is high level that the idle state touches the detection level)
State1-＞State2: touch detection signal level H (high level) → L (low level) saltus step, Δ V take place
Yy＜V
TyAnd Δ V
Xx＜V
Tx
State2-＞state1: detection signal level L → H saltus step.
State1-＞State3: H → L saltus step, V take place in detection signal level
Ty≤ Δ V
Yy, or V
Tx≤ Δ V
Xx
State3-＞state1: detection signal level L → H saltus step.
State2-＞state3: detect level and keep L, simultaneously Δ V
YyFrom Δ V
Yy＜V
TyChange to Δ V
Yy〉=V
Ty, or Δ V
XxFrom Δ V
Xx＜V
TxChange to Δ V
Xx〉=V
Tx
State3-＞state2: detect level and keep L, simultaneously Δ V
YyFrom V
Ty≤ Δ V
YyChange to V
Ty＞Δ V
Yy, or Δ V
XxFrom V
Tx≤ Δ V
XxChange to V
Tx＞Δ V
Xx
Each method embodiment of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention be with software, hardware, or the firmware mode realize, instruction code can be stored in the storer of computer-accessible of any kind (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium or the like).Equally, storer can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), ROM (read-only memory) (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
Second embodiment of the invention relates to a kind of equipment.This equipment comprises resistive touch screen, and equipment also comprises computing unit, judging unit and detecting unit:
Computing unit is used for calculating respectively the magnitude of voltage V of resistance in series end when y axle, x axle added electric field
ADC1_0, V
ADC1_1, V
ADC2_0, V
ADC2_1, V wherein
ADC1_0When not having a little to press at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V
ADC1_1When pressing a little at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V in like manner
ADC2_0, V
ADC2_1Be respectively when not having a little to press and press a little magnitude of voltage at the x axle resistance in series end of x axle added electric field;
Specifically, at first (YU=VDD YD=GND), does not put or has only any to be pressed then V if having at y axle added electric field
ADC1_0=VDD*R1/ (R1+Ry), in like manner (XL=VDD XR=GND) can get V at x axle added electric field
ADC2_0=VDD*R2/ (R2+Rx).If have 2 press simultaneously and y1 ≠ y2 promptly 2 distribute according to as shown in Figure 3 touch-screen resistance not at horizontal level, establish Rc=Rz1+Rx2+Rz2, then V
ADC1_1=VDD*R1/[(R1+ (Ry1+Ry2//Rc+Ry3)], if these 2 to be in horizontal level be y1=y2, then in like manner can calculate V
ADC2_1Wherein, be used for calculating voltage value V
ADC1_0, V
ADC1_1Resistance R 1 be used for calculating voltage value V
ADC2_0, V
ADC2_1Resistance R 2 recommend value 100ohm.Certainly, R1 can adjust according to different touch-screen resistance characteristics with R2, and recommending value for resistive touch screen commonly used is 100ohm.
Judging unit is used to judge V
ADC1_1, V
ADC1_0Difference DELTA V
yWhether preset thresholding V more than or equal to first
Ty, V
ADC2_1, V
ADC2_0Difference DELTA V
xWhether preset thresholding V more than or equal to second
Tx
Detecting unit is used for judging V at judging unit
ADC1_1, V
ADC1_0Difference DELTA V
yPreset thresholding V more than or equal to first
Ty, perhaps V
ADC2_1, V
ADC2_0Difference DELTA V
xPreset thresholding V more than or equal to second
TxThe time, judging on the resistive touch screen has be pressed at 2.
Equipment in the present embodiment also comprises the slip detecting unit, is used to detect 2 of being pressed and whether has relative motion trend.
Detecting unit detect have be pressed on the resistive touch screen at 2 after, indication slip detecting unit detects 2 of being pressed and whether has relative motion trend.
The slip detecting unit can detect 2 of being pressed in the following manner and whether have relative motion trend:
Judge V
ADC1_1Or V
ADC2_1Whether be the trend that diminishes, if V
ADC1_1Or V
ADC2_1Be the trend that diminishes, then judge be pressed 2 close.
Judge V
ADC1_1Or V
ADC2_1Whether be the change megatrend, if V
ADC1_1Or V
ADC2_1Be the change megatrend, then judge 2 of being pressed away from.
If V
ADC1_1Or V
ADC2_1Both be not the trend that diminishes, be not the change megatrend yet, judged then that there was not relative motion trend in 2 of being pressed.
There is following state in resistive touch screen in the present embodiment: the touch-screen free time, have any to press, have press at 2.Resistive touch screen is changed between each state.
Be not difficult to find that first embodiment is and the corresponding method embodiment of present embodiment, present embodiment can with the enforcement of working in coordination of first embodiment.The correlation technique details of mentioning in first embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in first embodiment.
Need to prove, each unit of mentioning in each equipment embodiment of the present invention all is a logical block, physically, a logical block can be a physical location, it also can be the part of a physical location, can also realize that the physics realization mode of these logical blocks itself is not most important with the combination of a plurality of physical locations, the combination of the function that these logical blocks realized is the key that just solves technical matters proposed by the invention.In addition, for outstanding innovation part of the present invention, above-mentioned each the equipment embodiment of the present invention will not introduced not too close unit with solving technical matters relation proposed by the invention, and this does not show that there is not other unit in the said equipment embodiment.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. resistive touch screen two point detecting methods is characterized in that, comprise following steps:
When detect press a little after, calculate the magnitude of voltage V of each resistance in series end when y axle, x axle added electric field respectively
ADC1_0, V
ADC1_1, V
ADC2_0, V
ADC2_1, V wherein
ADC1_0When not having a little to press at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V
ADC1_1When pressing a little at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V in like manner
ADC2_0, V
ADC2_1Be respectively when not having a little to press and press a little magnitude of voltage at the x axle resistance in series end of x axle added electric field;
If V
ADC1_1, V
ADC1_0Difference DELTA V
yPreset thresholding V more than or equal to first
Ty, perhaps V
ADC2_1, V
ADC2_0Difference DELTA V
xPreset thresholding V more than or equal to second
Tx, judge that then having on the described resistive touch screen at 2 is pressed.
2. resistive touch screen two point detecting methods according to claim 1 is characterized in that, detect have be pressed on the described resistive touch screen at 2 after, also comprise following steps:
Whether 2 of being pressed of detection exist relative motion trend.
3. resistive touch screen two point detecting methods according to claim 2 is characterized in that, detect 2 of being pressed in the following manner and whether have relative motion trend:
Judge described V
ADC1_1Or described V
ADC2_1Whether be the trend that diminishes, if described V
ADC1_1Or described V
ADC2_1Be the trend that diminishes, judge that then described 2 of being pressed are close;
Judge described V
ADC1_1Or described V
ADC2_1Whether be the change megatrend, if described V
ADC1_1Or described V
ADC2_1Be the change megatrend, then judge described 2 of being pressed away from;
If described V
ADC1_1With described V
ADC2_1Both be not the trend that diminishes, be not the change megatrend yet, judged then that there was not relative motion trend in 2 of being pressed.
4. according to each described resistive touch screen two point detecting methods in the claim 1 to 3, it is characterized in that there is following state in described resistive touch screen:
The touch-screen free time, there is any to press, have press at 2;
Described resistive touch screen is changed between described each state.
5. according to each described resistive touch screen two point detecting methods in the claim 1 to 3, it is characterized in that the resistance in series R1 of x axle and y axle and the resistance of R2 are adjusted according to different touch-screen resistance characteristics, it is 100ohm that R1 and R2 recommend value.
6. an equipment comprises resistive touch screen, it is characterized in that, described equipment also comprises:
Computing unit is used for calculating respectively the magnitude of voltage V of resistance in series end when y axle, x axle added electric field
ADC1_0, V
ADC1_1, V
ADC2_0, V
ADC2_1, V wherein
ADC1_0When not having a little to press at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V
ADC1_1When pressing a little at the magnitude of voltage of the y axle resistance in series end of y axle added electric field, V in like manner
ADC2_0, V
ADC2_1Be respectively when not having a little to press and press a little magnitude of voltage at the x axle resistance in series end of x axle added electric field;
Judging unit is used to judge V
ADC1_1, V
ADC1_0Difference DELTA V
yWhether preset thresholding V more than or equal to first
Ty, V
ADC2_1, V
ADC2_0Difference DELTA V
xWhether preset thresholding V more than or equal to second
Tx
Detecting unit is used for judging V at described judging unit
ADC1_1, V
ADC1_0Difference DELTA V
yPreset thresholding V more than or equal to first
Ty, perhaps V
ADC2_1, V
ADC2_0Difference DELTA V
xPreset thresholding V more than or equal to second
TxThe time, judge that having on the described resistive touch screen at 2 is pressed.
7. equipment according to claim 6 is characterized in that described equipment also comprises the slip detecting unit, is used to detect 2 of being pressed and whether has relative motion trend;
Described detecting unit detect have be pressed on the described resistive touch screen at 2 after, whether 2 that indicate described slip detecting unit to detect to be pressed exist relative motion trend.
8. equipment according to claim 7 is characterized in that, described slip detecting unit detects 2 of being pressed in the following manner and whether has relative motion trend:
Judge described V
ADC1_1Or described V
ADC2_1Whether be the trend that diminishes, if described V
ADC1_1Or described V
ADC2_1Be the trend that diminishes, judge that then described 2 of being pressed are close;
Judge described V
ADC1_1Or described V
ADC2_1Whether be the change megatrend, if described V
ADC1_1Or described V
ADC2_1Be the change megatrend, then judge described 2 of being pressed away from;
If described V
ADC1_1With described V
ADC2_1Both be not the trend that diminishes, be not the change megatrend yet, judged then that there was not relative motion trend in 2 of being pressed.
9. according to each described equipment in the claim 6 to 8, it is characterized in that there is following state in described resistive touch screen:
The touch-screen free time, there is any to press, have press at 2;
Described resistive touch screen is changed between described each state.
10. according to each described equipment in the claim 6 to 8, it is characterized in that the resistance in series R1 of x axle and y axle adjusts according to different touch-screen resistance characteristics with R2, it is 100ohm that R1 and R2 recommend value.
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| CN 200910057950 CN102033674B (en) | 2009-09-25 | 2009-09-25 | Two-point detection method and equipment for resistive touch screen |
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| CN102830887A (en) * | 2011-06-13 | 2012-12-19 | 炬力集成电路设计有限公司 | Touch control method and control circuit of resistance type touch screen |
| CN102855047A (en) * | 2011-06-27 | 2013-01-02 | 炬力集成电路设计有限公司 | Detection device, detection circuit and detection method for resistive touch screen |
| WO2013149393A1 (en) * | 2012-04-06 | 2013-10-10 | 展讯通信（上海）有限公司 | Resistive touch screen, and double-point detection processing method and device thereof |
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