CN101644982A - Screen positioning algorithm of four-wire resistance type touch screen - Google Patents
Screen positioning algorithm of four-wire resistance type touch screen Download PDFInfo
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Abstract
The invention discloses a screen positioning algorithm of a four-wire resistance type touch screen, comprising the steps of S1, initial generation of matching proportional factors in fixed point calibration; S2, dynamic modification of the matching proportional factors in the use process of a user; S3, coordinate transformation from touch point to display pixel point; and S4, software code realization of the algorithm. The invention realizes a specific software algorithm that a click point for clicking the touch screen and a display area on a display screen can correctly and correlatively match.
Description
Technical field
The present invention relates to a kind of resistive touch screen technology, particularly relate to a kind of screen location algorithm of 4 wire resistance type touch-screens.
Background technology
Under the environment of the continuous development of personal mobile communication technology, mobile phone is increasing to people's effect now, and that the alternating interface between man and computer of mobile phone is also done is more and more abundanter, the more and more hommization that the control operation mode is also done.Specific to in the input of the mobile phone control, now general control input mode be except button be exactly the screen touch mode.The input mode of screen touch has almost become now the standard configuration of mobile phone, and people also are liking very for this convenient, flexible input mode.The input mode of screen touch, inevitably can run into the whether accurately problem of associated match of a touch point and viewing area, clicking point and viewing area can accurately be mapped, inaccurate, maloperation, use inconvenience or the like problem will occur clicking.
Summary of the invention
The technical problem to be solved in the present invention is in order to overcome the defective of prior art, a kind of screen location algorithm of 4 wire resistance type touch-screens is provided, it is a kind of when using touch-screen on various cell phone platforms, makes the accurately associated match concrete software algorithm realization of getting up of the clicking point of clicking touch-screen and the viewing area on the display screen.
The present invention solves above-mentioned technical matters by following technical proposals: a kind of screen location algorithm of 4 wire resistance type touch-screens is characterized in that this algorithm may further comprise the steps:
The preliminary generation of the matching ratio factor in S1, the fixed point calibration process;
The dynamic correction of the matching ratio factor in S2, the user's use;
The coordinate transform that display pixel point is arrived in S3, touch point;
The software code realization of S4, algorithm.
Preferably, among the described step S1 calibration process in, use 5 fixed point calibration method, respectively to center, the upper left corner, the upper right corner, the lower left corner and the lower right corner totally 5 screen display points carry out the data sampling of touch panel.
Preferably, described fixed point calibration method may further comprise the steps: at first calibration point is shown at the display screen center that the wait user touch point is hit; After user's click and confirming that the data that sample are effective, calibration point is hit in upper left corner demonstration and wait user touch point; So circulation, up to 5 calibration points all respectively sampling finish and data effectively till.
Preferably, the touch coordinate data that the displaing coordinate of described 5 calibration points and sampling thereon obtain has just comprised the match information of display screen and touch panel, and the matching ratio that can obtain between them by follow-up algorithm concerns.
Preferably, after the data of described sampling are carried out computing, draw the matching ratio factor, and the algorithm of computing is followed following signal formula: in the calibration point of same axle, another sampling maximal value deducts minimum value and removes in the absolute difference of coaxial displaing coordinate point.
Preferably, X-axis is in the described matching ratio factor: X_factor=(| X_TP_left_adcvalue-X_TP_right_adcvalue|)/(| X_DSP_left-X_DSP_right|), wherein, X-axis is calculated/two the matching ratio factors in lower part, Y-axis is calculated two matching attributes of a left side/right half, and calculates the sampled data scope of touch-screen click on area simultaneously.
Preferably, the process that described step S2 dynamically revises the matching ratio factor comprises: at first use the control transmission line sampling that changes little X-axis, calculate the stable Y-axis matching ratio factor, converse the Y-axis parameter of current touch point displaing coordinate with this; The parameter in the zone of whole demonstration is compared on the Y-axis parameter of using this displaing coordinate and the Y-axis, draws the linear change size parameter y_rate of the correspondence of current touch point on the Y-axis transmission line; Use on this parameter and the X-axis/the difference absolute number of following two matching ratio factors multiplies each other, get the migration size, on this compensating offset compensation size and the X-axis/reckling addition in the following matching ratio factor, thereby obtained the matching ratio factor on the X-axis of current touch point dynamically, concrete arithmetic is expressed as follows: X_TP_current_factor=min (X_top_factor, X_bottom_factor)+(| X_bottom_factor-X_top_factor|) * y_rate.
Preferably, following signal formula is followed in the coordinate transform of described step S3: the X/Y axle parameter of current touch sampled point deducts the coaxial matching ratio factor of coaxial parameter effective value minimum number gained difference divided by current touch point.
Preferably, the software code realization of algorithm is divided into two parts among the described step S4, first be early stage to the part of obtaining of calibration reference parameter, second portion is the coordinate conversion part to the dynamic correction and the touch/demonstration of the matching ratio factor in the touch-screen use energy.
Preferably, described first may further comprise the steps: the calibration interface that enters touch-screen, at first the position with calibration point shows on the display screen again, wait for that the user touches and the coordinate data of the touch panel of this calibration point of sampling, process above repeating is till five touch points of different displaing coordinates all sample touch coordinate data; Utilize first three step S1 in the above, S2, go up said algorithm process with S3, calculate the reference parameter of calibration respectively, after these parameters are generated, use last calibration reference parameter to calculate the touch coordinate data scope of current each calibration point in the scope of the error of 10 pixels, and whether the touch data that relatively samples is in the error range that calculates, when the sampled data of five calibration points all in error range, the touch screen calibration success of this time is described so, just now the calibration parameter that obtained is preserved and is used for later touch action computing application, finishes calibration process then; If the sampled data that a calibration point is arranged keeps current calibration data so not within error range, recalibrate flow process, until till calibrating successfully.
Preferably, the reference parameter of described calibration is the factor of matching ratio up and down of X-axis, the left and right sides matching ratio factor of Y-axis, the parameter of effective range up and down of X-axis, the left and right sides effective range parameter of Y-axis.
Preferably, described second portion may further comprise the steps: at first calculate more stable Y-axis Dynamic matching scale factor y_factor=(y_left_factor+y_right_factor)/2; Calculate Y-axis displaing coordinate parameter: y_dsp=((y_current_adcabs (y_left_min, y_right_min))/y_factor) by algorithmic formula then; Utilize the y_dsp that calculates above to calculate the linear change size parameter y_rate=(y_dsp/TP_HEIGHT_LCD) of the correspondence of current touch point on the Y-axis transmission line again; Use at last the y_rate calculated calculate the current dynamic X-axis matching ratio factor: x_factor=(min (and X_top_factor, X_bottom_factor)+(| X_bottom_factor-X_top_factor|) * y_rate); Thereby calculate X-axis displaing coordinate parameter: x_dsp=((x_current_adcmin (x_top_min, x_bottom_min))/x_factor).
Positive progressive effect of the present invention is: the present invention can accurately must be mapped clicking point and viewing area, make click accurately, can not maloperation and easy to use etc.
Description of drawings
Fig. 1 is the principle schematic that the inventive method provides relevant hardware driving control in the screen location algorithm of 4 wire resistance type touch-screens;
Fig. 2 is that the inventive method provides the software flow pattern that relevant calibration parameter obtains in the screen location algorithm of 4 wire resistance type touch-screens;
Fig. 3 is that the inventive method provides the relevant software flow pattern of dynamically revising the matching ratio factor and touch/displaing coordinate conversion in the screen location algorithm of 4 wire resistance type touch-screens.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The screen location algorithm of a kind of 4 wire resistance type touch-screens provided by the invention, it comprises the steps:
(1) the preliminary generation of the matching ratio factor in the fixed point calibration process;
(2) the dynamic correction of the matching ratio factor in user's use;
(3) touch point is to the coordinate transform of display pixel point;
(4) software code realization of algorithm.
The invention provides a preferred embodiment comes the inventive method is described further, the embodiment of the invention is to carry out on the GSM of Spreadtrum Communications Inc.'s mobile phone baseband chip 6600D chip platform, and platform software is the application software that makes based on this 6600D platform.The touch-screen hardware driving mode of using is to use four GPIO (the General Purpose I/O in the baseband chip, general I/O) control pin and two ADC (Analog-to-Digital Converter, analog to digital converter) detection port realize.
Fig. 1 is the principle schematic of relevant hardware driving control, its principle of work is: under idle condition, GPIO_XL keeps interrupting input state, other pin is the low state of output, because XL has weak pull-up resistor, when touch/click action,, the XL pin interrupts the handling procedure that the guidance system program enters touch-screen thereby being dragged down triggering.In handling procedure, when will sample to X-axis, the pin that Y-axis is relevant becomes to be done input and handles, and X output high level, and the XR output low level reads the ADC that is connected with YD then, thus obtain need sampled value; In like manner to the sampling of Y-axis also respective handling.After the sampling, according to circumstances allow touch-screen enter free time or other feature operation, finish drive controlling once.
Below, the present invention will be described in detail above-mentioned 4 performing step:
(1) the preliminary generation of the matching ratio factor in the fixed point calibration process.
In order to obtain the setpoint information of detailed touch-screen, calibration process in, we have used 5 fixed point calibration method, respectively to the center, the upper left corner, the upper right corner, the data sampling of touch panel (touch panel) is carried out in the lower left corner, the lower right corner totally 5 screen display points.Concrete way is in the calibration interface, at first calibration point is shown at the display screen center, and the wait user touch point is hit; After user's click and confirming that the data that sample are effective, calibration point is hit in upper left corner demonstration and wait user touch point; So circulation, up to 5 calibration points all respectively sampling finish and data effectively till.And the touch coordinate data that the displaing coordinate of these 5 calibration points and sampling thereon obtain has just comprised the match information of display screen and touch panel, and the matching ratio that can obtain between them by follow-up algorithm concerns.Be that the processing on the program is convenient, from hardware wiring and drive arrangements, start with, make the sampled data of calibration point follow the maximum that the coordinate data that samples is the upper left corner, and the minimum in lower right corner logical relation so.Then, we carry out computing to the data of sampling, draw the matching ratio factor, and the algorithm of computing is with following following signal formula: in same certain the calibration point, another sampling maximal value deducts minimum value and removes in the absolute difference of coaxial displaing coordinate point, the matching ratio factor in the hope of X-axis is an example, X_factor=(| X_TP_left_adcvalue-X_TP_right_adcvalue|)/(| X_DSP_left-X_DSP_right|).Because the linear property of transmission line resistance on the electrical specification of 4 wire resistance type touch panels and the control channel, make that the matching ratio factor of different touch points also difference can occur in screen, so in order in using the touch-screen process, to revise the matching ratio factor dynamically according to current touch point, also according to the linear property of transmission line resistance on the electrical specification of 4 wire resistance type touch panels and the control channel, we calculate X-axis/two the matching ratio factors in lower part (X_top_factor/X_bottom_factor), Y-axis is calculated two matching attributes of a left side/right half (Y_left_factor/Y_right_factor), and calculate the sampled data scope (X_min_adc of touch-screen click on area simultaneously, X_max_adc, Y_min_adc, Y_max_adc).
(2) the dynamic correction of the matching ratio factor in user's use.
Need dynamically to revise the matching ratio factor and the dynamically realization of correction algorithm, all be based on the linear property of transmission line resistance on the electrical specification of 4 wire resistance type touch panels and the control channel.According to the characteristics of these two ardware features and analyze the data that obtain from the touch-screen up-sampling, we find voltage at the Y-axis two ends along the extension of transmission line and linear diminishing (it is big that transmission line resistance constantly becomes), influence the voltage of sampling circuit, thereby the matching ratio factor that causes X-axis is also followed linear change; For X-axis, exist such situation too, but since the transmission line on the X-axis all be relatively short and up and down two transmission lines be respectively near power supply with away from the two poles end, make that the variation of this linearity is very little, in receptible scope, can ignore.So according to above characteristics, the basic ideas of dynamically revising the matching ratio factor algorithm are: at first use the control transmission line sampling that changes little X-axis, calculate the stable Y-axis matching ratio factor, converse the Y-axis parameter of current touch point displaing coordinate with this; The parameter (TP_HEIGHT_LCD) in the zone of whole demonstration is compared on the Y-axis parameter (Y_DSP_VALUE) of using this displaing coordinate and the Y-axis, draws the linear change size parameter (y_rate) of the correspondence of current touch point on the Y-axis transmission line; Use on this parameter and the X-axis/the difference absolute number of following two matching ratio factors multiplies each other, get the migration size, on this compensating offset compensation size and the X-axis/reckling addition in the following matching ratio factor, thereby obtained the matching ratio factor on the X-axis of current touch point dynamically, concrete arithmetic is expressed as follows:
X_TP_current_factor＝min(X_top_factor，X_bottom_factor)+(|X_bottom_factor-X_top_tactor|)*y_rate。
(3) touch point is to the coordinate transform of display pixel point.
Produce as touch action, and after the matching ratio factor of position, touch point also followed two steps in front and drawn, last work converted the touch coordinate on this TP panel to the coordinate of viewing area exactly.The algorithm that converts almost is the contrary operation that calculates the matching ratio factor, and follow following signal formula: the X/Y axle parameter (X_current_adc/Y_current_adc) of current touch sampled point deducts the coaxial matching ratio factor of coaxial parameter effective value minimum number (X_min_adc/Y_min_adc) gained difference divided by current touch point.
(4) software code realization of algorithm.
The software code realization of total algorithm can be divided into two parts, first be early stage to the part of obtaining of calibration reference parameter, second portion is the coordinate conversion part to the dynamic correction and the touch/demonstration of the matching ratio factor in the touch-screen use energy.As shown in Figures 1 and 2, more clearlyly this two-part realization flow has been carried out signal described.
Fig. 2 is the software flow that relevant calibration parameter obtains, as shown in Figure 2, it in system program disposable handling procedure, be stored in the database after calibration parameter obtains and efficiency confirmed, and in the touch-screen use, the parameter of these calibrations is not obtain (unless specially entering calibration process) again, and is used in the calculation process of algorithm.The concrete realization of this software flow is: the calibration interface that enters touch-screen, at first the position with calibration point shows on the display screen again, wait for that the user touches and the coordinate data of the touch panel of this calibration point of sampling, process above repeating is till five touch points of different displaing coordinates all sample touch coordinate data; Utilize our said algorithm process on first three step in the above, calculate the reference parameter of calibration respectively, these parameters are respectively:
The factor of matching ratio up and down (x_top_factor/x_bottom_factor) of X-axis,
The left and right sides matching ratio factor (y_left_factor/y_right_factor) of Y-axis,
The parameter of the effective range up and down (x_top_min/max of X-axis; X_bottom_min/max),
The left and right sides effective range parameter (y_left_min/max of Y-axis; Y_right_min/max), or the like.
After these parameters are generated, use (if first calibration of last calibration reference parameter, the reference parameter of use acquiescence) calculates the touch coordinate data scope of current each calibration point (displaing coordinate) in the scope of the error of 10 pixels, and whether the touch data that relatively samples is in the error range that calculates, when the sampled data of five calibration points all in error range, the touch screen calibration success of this time is described so, just now the calibration parameter that obtained is preserved and is used for later touch action computing application, finishes calibration process then; If the sampled data that a calibration point is arranged keeps current calibration data so not within error range, recalibrate flow process, until till calibrating successfully.
Fig. 3 is the relevant software flow pattern of dynamically revising the matching ratio factor and touch/displaing coordinate conversion, and its specific implementation is: at first calculate more stable Y-axis Dynamic matching scale factor y_factor=(y_left_factor+y_right_factor)/2; Calculate Y-axis displaing coordinate parameter: y_dsp=((y_current_adcabs (y_left_min, y_right_min))/y_factor) by algorithmic formula then; Utilize the y_dsp that calculates above to calculate the linear change size parameter y_rate=(y_dsp/TP_HEIGHT_LCD) of the correspondence of current touch point on the Y-axis transmission line again; Use at last the y_rate calculated calculate the current dynamic X-axis matching ratio factor: x_factor=(min (and X_top_factor, X_bottom_factor)+(| X_bottom_factor-X_top_factor|) * y_rate); Thereby calculate X-axis displaing coordinate parameter: x_dsp=((x_current_adcmin (x_top_min, x_bottom_min))/x_factor).
Through above calculation process, the touch coordinate of realization is to the conversion process of displaing coordinate.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these embodiments.Therefore, protection scope of the present invention is limited by appended claims.
Claims (12)
1, a kind of screen location algorithm of 4 wire resistance type touch-screens is characterized in that, this algorithm may further comprise the steps:
The preliminary generation of the matching ratio factor in S1, the fixed point calibration process;
The dynamic correction of the matching ratio factor in S2, the user's use;
The coordinate transform that display pixel point is arrived in S3, touch point;
The software code realization of S4, algorithm.
2, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 1, it is characterized in that, among the described step S1 the calibration process in, use 5 fixed point calibration method, respectively to center, the upper left corner, the upper right corner, the lower left corner and the lower right corner totally 5 screen display points carry out the data sampling of touch panel.
3, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 2 is characterized in that, described fixed point calibration method may further comprise the steps: at first calibration point is shown at the display screen center that the wait user touch point is hit; After user's click and confirming that the data that sample are effective, calibration point is hit in upper left corner demonstration and wait user touch point; So circulation, up to 5 calibration points all respectively sampling finish and data effectively till.
4, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 3, it is characterized in that, the touch coordinate data that the displaing coordinate of described 5 calibration points and sampling thereon obtain has just comprised the match information of display screen and touch panel, and the matching ratio that can obtain between them by follow-up algorithm concerns.
5, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 4, it is characterized in that, after the data of described sampling are carried out computing, draw the matching ratio factor, and the algorithm of computing is followed following signal formula: in the calibration point of same axle, another sampling maximal value deducts minimum value and removes in the absolute difference of coaxial displaing coordinate point.
6, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 5, it is characterized in that, X-axis is in the described matching ratio factor: X_factor=(| X_TP_left_adcvalue-X_TP_right_adcvalue|)/(| X_DSP_left-X_DSP_right|), wherein, X-axis is calculated/two the matching ratio factors in lower part, Y-axis is calculated two matching attributes of a left side/right half, and calculates the sampled data scope of touch-screen click on area simultaneously.
7, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 1, it is characterized in that, the process that described step S2 dynamically revises the matching ratio factor comprises: at first use the control transmission line sampling that changes little X-axis, calculate the stable Y-axis matching ratio factor, converse the Y-axis parameter of current touch point displaing coordinate with this; The parameter in the zone of whole demonstration is compared on the Y-axis parameter of using this displaing coordinate and the Y-axis, draws the linear change size parameter y_rate of the correspondence of current touch point on the Y-axis transmission line; Use on this parameter and the X-axis/the difference absolute number of following two matching ratio factors multiplies each other, get the migration size, on this compensating offset compensation size and the X-axis/reckling addition in the following matching ratio factor, thereby obtained the matching ratio factor on the X-axis of current touch point dynamically, concrete arithmetic is expressed as follows: X_TP_current_factor=min (X_top_factor, X_bottom_factor)+(| X_bottom_factor-X_top_factor|) * y_rate.
8, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 1, it is characterized in that following signal formula is followed in the coordinate transform of described step S3: the X/Y axle parameter of current touch sampled point deducts the coaxial matching ratio factor of coaxial parameter effective value minimum number gained difference divided by current touch point.
9, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 1, it is characterized in that, the software code realization of algorithm is divided into two parts among the described step S4, first be early stage to the part of obtaining of calibration reference parameter, second portion is the coordinate conversion part to the dynamic correction and the touch/demonstration of the matching ratio factor in the touch-screen use energy.
10, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 9, it is characterized in that, described first may further comprise the steps: the calibration interface that enters touch-screen, at first the position with calibration point shows on the display screen again, wait for that the user touches and the coordinate data of the touch panel of this calibration point of sampling, process above repeating is till five touch points of different displaing coordinates all sample touch coordinate data; Utilize first three step S1 in the above, S2, go up said algorithm process with S3, calculate the reference parameter of calibration respectively, after these parameters are generated, use last calibration reference parameter to calculate the touch coordinate data scope of current each calibration point in the scope of the error of 10 pixels, and whether the touch data that relatively samples is in the error range that calculates, when the sampled data of five calibration points all in error range, the touch screen calibration success of this time is described so, just now the calibration parameter that obtained is preserved and is used for later touch action computing application, finishes calibration process then; If the sampled data that a calibration point is arranged keeps current calibration data so not within error range, recalibrate flow process, until till calibrating successfully.
11, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 10, it is characterized in that the reference parameter of described calibration is the factor of matching ratio up and down of X-axis, the left and right sides matching ratio factor of Y-axis, the parameter of effective range up and down of X-axis, the left and right sides effective range parameter of Y-axis.
12, the screen location algorithm of 4 wire resistance type touch-screens as claimed in claim 9, it is characterized in that described second portion may further comprise the steps: at first calculate more stable Y-axis Dynamic matching scale factor y_factor=(y_left_factor+y_right_factor)/2; Calculate Y-axis displaing coordinate parameter: y_dsp=((y_current_adcabs (y_left_min, y_right_min))/y_factor) by algorithmic formula then; Utilize the y_dsp that calculates above to calculate the linear change size parameter y_rate=(y_dsp/TP_HEIGHT_LCD) of the correspondence of current touch point on the Y-axis transmission line again; Use at last the y_rate calculated calculate the current dynamic X-axis matching ratio factor: x_factor=(min (and X_top_factor, X_bottom_factor)+(| X_bottom_factor-X_top_factor|) * y_rate); Thereby calculate X-axis displaing coordinate parameter: x_dsp=((x_current_adcmin (x_top_min, x_bottom_min))/x_factor).
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Application publication date: 20100210 |