CN202649982U - Capacitive touch screen detecting device - Google Patents
Capacitive touch screen detecting device Download PDFInfo
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- CN202649982U CN202649982U CN 201120312794 CN201120312794U CN202649982U CN 202649982 U CN202649982 U CN 202649982U CN 201120312794 CN201120312794 CN 201120312794 CN 201120312794 U CN201120312794 U CN 201120312794U CN 202649982 U CN202649982 U CN 202649982U
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Abstract
A capacitive touch screen detecting device is disclosed, belonging to the field of capacitive touch screens. The detecting device comprises: a baseline detecting unit which detects a capacitance value of a first frame of a capacitive touch screen and saves the capacitance value of the first frame as a capacitance value of a baseline; a capacitance detecting unit which detects and saves capacitance values of other N frames, other than the first frame, of the capacitive touch screen; a comparing unit which compares the capacitance values of the N frames with the capacitance value of the baseline to eliminate M noise frames; a mean value calculating unit which balances the capacitance values of rest N-M frames; and a coordinate calculating unit which calculates coordinates of a touch point based on the balanced capacitance values. The comparing unit is connected with the capacitance detecting unit and the baseline detecting unit. The mean value calculating unit is connected with the comparing unit. The coordinate calculating unit is connected with the mean value calculating unit. Noises can be divided into positive noises and negative noises so that the capacitive touch screen detecting device adds and then balances all the capacitance values of the N-M frames to make capacitance signal values multiplied by N-M while the noises is little in change, thereby increasing the signal to noise ratio of capacitance signals and reducing the probability of misjudgments.
Description
Technical field
The utility model belongs to the capacitance touch screen field, relates in particular to a kind of capacitive touch screen pick-up unit.
Background technology
Along with the progress of science and technology, capacitive touch screen more and more is widely used in various device, such as: handset touch panel, panel computer, touch key-press etc.
In Cell Phone Design, realize that the key of a sane capacitive touch screen design is to obtain large signal to noise ratio (S/N ratio) (SNR, Signal/Noise).At electronic communication and other engineering field, signal to noise ratio (S/N ratio) generally represents with decibel (dB).But in the finger sensing of capacitive touch screen is used, do not advise adopting decibel as the measuring unit of signal to noise ratio (S/N ratio), because also uncertain to its computing method.Signal to noise ratio (S/N ratio) formula based on power is 10log(P2/P1), be 20log(V2/V1 based on the signal to noise ratio (S/N ratio) formula of voltage amplitude), but which formula is more suitable for it be unclear that in touching to use actually.In addition, obscure also existing aspect the explanation of " decibels of touch ".For fear of these problems, Sai Pulasi (Cypress) semiconductor company adopts a kind of simple ratio as the first-selected benchmark of capacitance type sensing signal to noise ratio (S/N ratio).The best practice guideline that Sai Pulasi provides is signal than noise large at least 5 times.According to engineering term, minimum exactly signal to noise ratio (S/N ratio) is 5:1.Signal to noise ratio (S/N ratio) during touch sensor is used is measured according to raw data (RawData) value of sensor output terminal.Such as, peak-to-peak noise is not 6 when pointing on the sensor.When finger was placed on the sensor, the signal of acquisition was 130, and then signal to noise ratio (S/N ratio) is 130:6, is about 22:1.
The measurement of capacitive touch screen should be considered best-case and worst case, and best-case refers to that larger finger is placed on sensor pad center.Worst case is that less finger departs from the center placement.In the early development of cell phone system, utilizing real finger to test is a kind of acceptable method.If it is more irrelevant with the operator that the developer wishes test, and can repeat, can replace real finger with metal bar.Because coverlay (overlay) thickness can weaken signal intensity, therefore, when being system development, safer way adopts than estimating slightly thick coverlay.For avoiding the shielding effect of more senior firmware, utilize original unpressed sensor count value to measure signal to noise ratio (S/N ratio).When not having finger touch, turn-off any self compensation or automatic calibration function that allows sensor output make zero.
Fig. 1 is the signal to noise ratio (S/N ratio) of capacitive touch screen under finger touch, in capacitive touch screen, signal to noise ratio (S/N ratio) has considerable influence to the touch point number, can produce erroneous judgement or misjudgement if deal with improperly, thereby there are errors in computation for touch coordinate, touch-screen emits a little arbitrarily in a jumble, can not correctly reflect real touch location.
The utility model content
The utility model touches the not high technical matters of electric capacity signal to noise ratio (S/N ratio) for solving existing capacitive touch screen, provides a kind of Detection capacitance signal to noise ratio (S/N ratio) higher capacitive touch screen pick-up unit.
A kind of capacitive touch screen pick-up unit comprises: the first frame capacitance of Detection capacitance formula touch-screen is as baseline capacitance and the Baseline detection unit of preserving, other N frame capacitance that Detection capacitance formula touch-screen is removed the first frame and the mean value computation unit that averages with the comparing unit of removing M frame noise frame, the capacitance that will remain the N-M frame to its capacitance detection unit of preserving, with N frame capacitance and the comparison of baseline capacitance, according to the coordinate Calculation unit of the capacitance calculating touch point coordinate after on average;
Described comparing unit connects capacitance detection unit and Baseline detection unit, and described mean value computation unit connects comparing unit, and described coordinate Calculation unit connects the mean value computation unit.
Further, the span of described N is [4,10], and the span of M is [2,5].
Further, described capacitance detection unit comprises:
Detect the capacitance of N frame capacitive touch screen and to its storage unit of storing, the frame number of described cell stores is counted and judged that the storage frame number reaches the counting unit of N frame;
Described counting unit connects described storage unit.
Further, the following formula of described mean value computation unit by using calculates the electric capacity average of N-M frame:
In the formula, differ_data[i] be the capacitance after average, data[i] [j] be capacitance corresponding to N-M two field picture of storage, and i is the array number of capacitive touch screen, and j is cumulative totalframes, and N is the totalframes of storage, M is the frame number of noise frame.
Further, described coordinate Calculation unit comprises:
Determine the first coordinate determining unit that touch location and touch are counted according to the capacitance after average;
Judge to touch the first judging unit in process range K point of whether counting;
Such as the touch point number greater than 1 and less than K point, the grouped element that then the multiple point touching coordinate is divided into groups;
The smooth unit that touch point coordinate touch point previous with it coordinate after grouping finished averages or touch point previous with it, current touch point coordinate is averaged;
Described the first judging unit connects described the first coordinate determination module, and described grouped element connects described the first judging unit, and described smooth unit connects described grouped element.
Further, the span of described process range K is [1,10].
Further, described smooth unit utilizes following formula that the touch point coordinate is processed:
In the formula: coor_x[i] be the horizontal ordinate after level and smooth, coor_y[i] be the ordinate after level and smooth, last_x[i] be the horizontal ordinate of last touch point, last_x[i] be the ordinate of last touch point, center_x[i] be the horizontal ordinate of current touch point, censor_y[i] be the ordinate of current touch point.
Further, described grouped element comprises:
Judge that whether the touch point number goes out the second judging unit of touch point number more than or equal to last computation;
The touch point number is gone out the first grouped element that divides into groups in the current touch point of touch point number more than or equal to last computation;
The touch point number is gone out the second grouped element that divides into groups in the current touch point of touch point number less than last computation;
Described the first grouped element be connected grouped element and all be connected with the second judging unit.
Pick-up unit of the present utility model has added capacitance detection unit, comparing unit and mean value computation unit, it is rear average that N-M frame capacitance is superposeed, because noise has positive and negative dividing, after the addition of N-M frame capacitance, the capacitance signal value becomes N-M doubly, and noise changes not quite, thereby has improved the signal to noise ratio (S/N ratio) of capacitance signal.The capacitance signal value that signal to noise ratio (S/N ratio) is higher can be determined the position of touch point accurately, reduces the probability that capacitive touch screen touches erroneous judgement, thereby the user who has improved capacitive touch screen experiences.
Description of drawings
Fig. 1 is the signal to noise ratio (S/N ratio) of capacitive touch screen under finger touch that prior art provides.
Fig. 2 is the capacitive touch screen pick-up unit synoptic diagram that the utility model provides.
Fig. 3 is the comparing unit inner structure synoptic diagram that the utility model provides.
Fig. 4 is the coordinate Calculation unit inner structure synoptic diagram that the utility model provides.
Fig. 5 is the packets inner structural representation that the utility model provides.
Embodiment
Clearer for technical matters, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
The capacitive touch screen testing circuit that the utility model provides comprises Baseline detection unit 21, capacitance detection unit 22, comparing unit 23, mean value computation unit 24, coordinate Calculation unit 25 as shown in Figure 2; Described comparing unit 23 connects Baseline detection unit 21 and capacitance detection unit 22, and described mean value computation unit 24 connects comparing unit 23, and described coordinate Calculation unit 25 connects mean value computation unit 24.
The first frame capacitance of Baseline detection unit 21 Detection capacitance formula touch-screens is as baseline capacitance and preservation; Capacitance detection unit 22 Detection capacitance formula touch-screens are removed other N frame capacitance of the first frame and it are preserved; Comparing unit 23 compares to remove M frame noise frame with N frame capacitance and baseline capacitance; The capacitance that mean value computation unit 24 will remain the N-M frame averages; Coordinate Calculation unit 25 calculates the touch point coordinate according to the capacitance after average.
So-called noise frame is and is subjected to other extraneous factor to affect larger frame.Such as the present frame no touch, then be subjected to such environmental effects, such as temperature, humidity etc., make in the N frame some capacitance from the baseline capacitance away from.The method of removing noise frame is: this frame capacitance and baseline capacitance are differed maximum M frame removal.Such as present frame touch is arranged, except being subjected to the impact of environmental factor, also the size with the size that touches area, touching intensity is relevant, the method of removing noise frame is: the N frame capacitance stored and baseline capacitance are successively done subtraction obtain the electric capacity difference, then obtain the average capacitance difference, and the M frame that electric capacity difference and average capacitance difference differ larger is removed.
Consider size, the frame per second of capacitive touch screen, the speed of pick-up unit, the span of described N are [4,10], the span of M is [2,5], for being of a size of 4.3 cun of 20*11, theoretical frame per second can arrive the touch-screen of 200 frame/seconds, as preferred version, N gets 6, M got 2 o'clock, can reach the detection speed of 80 frame/seconds, can determine rapidly and accurately the coordinate of touch point, better user experience; When N get 4, when M gets 2, the detection speed that reaches is higher, but accuracy rate is relatively low; When N get 10, when M gets 5, detection speed is lower, but accuracy rate is very high.
As shown in Figure 3, capacitance detection unit comprises: storage unit 31 and counting unit 32.Described counting unit 32 connects described storage unit 31.
Storage unit 31 detects the capacitance of N frame capacitive touch screen and it is stored, and the frame number of 32 pairs of described storage unit 31 of counting unit is counted and judged that the storage frame number reaches the N frame.After frame number that counting unit is counted reaches the N frame, with the counting unit zero clearing, be convenient to counting next time.
In order to improve computational accuracy, reduce error, comparing unit will compare except N frame capacitance and the baseline capacitance of storage, is about to store N frame capacitance and compares with the baseline capacitance respectively, removes the capacitance of M frame noise frame.
The following formula of described mean value computation unit by using calculates the electric capacity average of N-M frame:
；
In the formula, differ_data[i] be the capacitance after average, data[i] [j] be capacitance corresponding to N-M two field picture of storage, and i is the array number of capacitive touch screen, and j is cumulative frame number, and N is the totalframes of storage, M is the frame number of noise frame.
As shown in Figure 4, the coordinate Calculation unit comprises the first coordinate determination module 41, the first judging unit 42, grouped element 43, smooth unit 44.Described the first judging unit 42 connects described the first coordinate determination module 41, and described grouped element 43 connects described the first judging unit 42, and described smooth unit 44 connects described grouped element 43.
The first coordinate determining unit 41 determines that according to the capacitance after average touch location and touch count, concrete capacitance differ_data[i after will be average] compare with the baseline capacitance, with the distinguishing point of capacitance after the contrast of the first frame capacitance be the touch point.
The first judging unit 42 is judged the touch point number whether in process range K point, and the span of process range K is [1,10], if the touch point number has exceeded process range, then current touch is not processed, and regards it as wrong touch; If the touch point number in process range K point, is then divided into groups to it by grouped element 43 and smooth unit 44 that it is carried out coordinate is level and smooth, finally determine the coordinate figure of touch point.
If the touch point number is one, then need not grouping, it is level and smooth that smooth unit 44 is directly carried out coordinate to it; Greater than 1 and less than the K point, then 43 pairs of multiple point touching coordinates of grouped element divide into groups such as the touch point number;
When current touch point only has one, smooth unit 44 will average touch point previous with it, current touch point coordinate; When touch point when being a plurality of, the touch point coordinate touch point previous with it after smooth unit 44 is finished grouping averages.
In order to make touch curve level and smooth, smooth unit utilizes following formula that the touch point coordinate is processed:
In the formula: coor_x[i] be the horizontal ordinate after level and smooth, coor_y[i] be the ordinate after level and smooth, last_x[i] be the horizontal ordinate of last touch point, last_x[i] be the ordinate of last touch point, censor_x[i] be the horizontal ordinate of current touch point, censor_y[i] be the ordinate of current touch point.
As shown in Figure 5, grouped element of the present utility model comprises: the second judging unit 51, the first grouped element 52, the second grouped element 53.Described the first grouped element 52 be connected grouped element 53 and all be connected with the second judging unit 51.
The second judging unit 51 is judged the touch point number whether the touch point number goes out more than or equal to last computation; 52 pairs of touch point numbers of the first grouped element are divided into groups more than or equal to the current touch point that last computation goes out the touch point number; 53 pairs of touch point numbers of the second grouped element are divided into groups less than the current touch point that last computation goes out the touch point number.
The step that described the first grouped element 52 divides into groups is as follows: from current touch point, find out the point nearest with last touch point coordinate position, and the nearest touch point that will find and last time the touch point be divided into one group, until the grouping finish.
Concrete computing rule is as follows:
Step S11, at first calculate current all touch points that calculate with detecting in the touch point certain any distance last time, and be divided into one group with nearest 2;
Step S12, change position, detected touch point last time, repeating step S11 was until detected all touch points last time and the current grouping that calculates the touch point is finished.
In the current touch point not with last touch point coordinate position coupling, as the starting point of new touch.
The step that described the second grouped element divides into groups is as follows: find out from last touch point with current and touch the nearest point in point coordinate position, and the nearest touch point that will find and current touch point be divided into one group, until grouping is finished.
Concrete computing rule is as follows:
Step S21, at first calculate and detected all touch points last time with current certain any distance that calculates in the touch point, and be divided into one group with nearest 2;
The position, touch point of step S22, change present frame, repeating step S21 is until all touch point groupings of present frame are finished.
Last touch point coordinate is not with current touch point location matches, to its zero clearing.
Pick-up unit of the present utility model has added capacitance detection unit, comparing unit and mean value computation unit, it is rear average that N-M frame capacitance is superposeed, because noise has positive and negative dividing, after the addition of N-M frame capacitance, the capacitance signal value becomes N-M doubly, and noise changes not quite, thereby has improved the signal to noise ratio (S/N ratio) of capacitance signal.The capacitance signal value that signal to noise ratio (S/N ratio) is higher can be determined the position of touch point accurately, reduces the probability that capacitive touch screen touches erroneous judgement, thereby the user who has improved capacitive touch screen experiences.
In order to make the utility model more detailed, clear, the below does corresponding explanation to detection method of capacitance-type touch screen, specifically comprises the steps:
1, obtains the capacitance of the first frame of each point of capacitive touch screen as the baseline capacitance;
2, obtain the capacitance of the present frame of each point of capacitive touch screen;
3, frame number counter N adds 1, and the capacitance of this frame is saved in two-dimensional array data[i] in [j], i represents the array number of capacitive touch screen, j represents frame number;
4, whether whether judgment frame counter N namely preserved the data of Th frame greater than threshold value Th, if satisfy N greater than Th, then enters next step and do other algorithms; If do not satisfy N greater than Th, then the Th frame data have not been preserved in expression, then jump to the 2nd and go on foot the capacitance that removes to continue to obtain capacitive touch screen;
5, with frame counter N zero clearing, the capacitance that preserves is compared with the baseline capacitance, incite somebody to action wherein M frame noise frame jettisoning, the capacitance addition that will be left again frame obtains the cumulative and average array differ_data[i of difference], formula is as follows:
And enter next step;
6, by cumulative array differ_data[i] relatively calculate the number of touch point with the baseline capacitance, be stored among the variable TN and the coordinate of each touch point is stored in coordinate array center_x[i] and center_y[i] in, enter next step;
7, judgment variable TN whether equal 0 or variable TN whether greater than threshold k, what threshold k defined is to touch the maximum point number, the span of threshold k is [1,10], if satisfy this condition, prove so the number that does not have touch point or touch point greater than treatable maximum number, then return the 2nd and go on foot the capacitance data scanning of carrying out next time; If do not satisfy this condition, touch has been described, and the touch point number then jumps to step 8 in process range;
8, whether judgment variable TN greater than 1, if do not satisfy when being variable TN=1, jumps to step 10, if satisfied variable TN〉1 namely be multiple point touching, then jump to step 9;
9, the multiple spot coordinate is divided into groups, avoid a plurality of some collocation chaotic, the principle of grouping is:
A, the touch point number lastn that calculates more than or equal to the last time as variable TN, expression touch point number has to be increased or does not change, then from current touch point, find out the point nearest with last touch point coordinate position, and the nearest touch point that will find and last time the touch point be divided into one group.
In the current touch point not with last touch point coordinate position coupling, as the starting point of new touch.
B, when touch point number lastn that variable calculated less than the last time, the number of expression touch point has reduced, from current touch point, find out the point nearest with last touch point coordinate position, and the nearest touch point that will find and last time the touch point be divided into one group;
Last touch point coordinate is not with current touch point location matches, to its zero clearing.
10, after grouping is finished, each point is averaged algorithm with the data of its former frame, jump to step 2 after having calculated.
Data after average are put into coordinate array coor_x[i], coor_y[i] in, computing formula is as follows:
In the formula: coor_x[i] be the horizontal ordinate after level and smooth, coor_y[i] be the ordinate after level and smooth, last_x[i] be the horizontal ordinate of last touch point, last_x[i] be the ordinate of last touch point, censor_x[i] be the horizontal ordinate of current touch point, censor_y[i] be the ordinate of current touch point.
This detection method of capacitance-type touch screen stores the multiframe capacitance, and it is averaged, because noise has positive and negative dividing, after the addition of N-M frame capacitance, the capacitance signal value becomes N-M doubly, and noise changes not quite, thereby has improved the signal to noise ratio (S/N ratio) of capacitance signal.Utilize the higher capacitance signal value of signal to noise ratio (S/N ratio) can determine accurately the position of touch point, reduce the probability that capacitive touch screen touches erroneous judgement, thereby the user who has improved capacitive touch screen experiences.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (2)
1. a capacitive touch screen pick-up unit is characterized in that, described capacitive touch screen pick-up unit comprises:
The first frame capacitance of Detection capacitance formula touch-screen is as baseline capacitance and the Baseline detection unit of preserving, other N frame capacitance that Detection capacitance formula touch-screen is removed the first frame and the mean value computation unit that averages with the comparing unit of removing M frame noise frame, the capacitance that will remain the N-M frame to its capacitance detection unit of preserving, with N frame capacitance and the comparison of baseline capacitance, according to the coordinate Calculation unit of the capacitance calculating touch point coordinate after on average;
Described comparing unit connects capacitance detection unit and Baseline detection unit, and described mean value computation unit connects comparing unit, and described coordinate Calculation unit connects the mean value computation unit.
2. capacitive touch screen pick-up unit as claimed in claim 1 is characterized in that, described capacitance detection unit comprises:
Detect the capacitance of N frame capacitive touch screen and to its storage unit of storing, the frame number of described cell stores is counted and judged that the storage frame number reaches the counting unit of N frame;
Described counting unit connects described storage unit.
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| CN 201120312794 CN202649982U (en) | 2011-08-25 | 2011-08-25 | Capacitive touch screen detecting device |
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| CN 201120312794 CN202649982U (en) | 2011-08-25 | 2011-08-25 | Capacitive touch screen detecting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105308467A (en) * | 2013-03-13 | 2016-02-03 | 辛纳普蒂克斯公司 | Proximity sensing |
| CN114490225A (en) * | 2022-04-06 | 2022-05-13 | 合肥创发微电子有限公司 | Method and device for acquiring touch screen pixel point capacitance value mean value and detection method |
| CN114706498A (en) * | 2022-06-06 | 2022-07-05 | 合肥创发微电子有限公司 | Method and device for displaying pressing position of touch screen through touch screen software |
-
2011
- 2011-08-25 CN CN 201120312794 patent/CN202649982U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105308467A (en) * | 2013-03-13 | 2016-02-03 | 辛纳普蒂克斯公司 | Proximity sensing |
| CN105308467B (en) * | 2013-03-13 | 2017-06-20 | 辛纳普蒂克斯公司 | Closely sense |
| CN114490225A (en) * | 2022-04-06 | 2022-05-13 | 合肥创发微电子有限公司 | Method and device for acquiring touch screen pixel point capacitance value mean value and detection method |
| CN114706498A (en) * | 2022-06-06 | 2022-07-05 | 合肥创发微电子有限公司 | Method and device for displaying pressing position of touch screen through touch screen software |
| CN114706498B (en) * | 2022-06-06 | 2022-08-19 | 合肥创发微电子有限公司 | Method and device for displaying pressing position of touch screen through touch screen software |
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Effective date of registration: 20191230 Address after: 518119 1 Yanan Road, Kwai Chung street, Dapeng New District, Shenzhen, Guangdong Patentee after: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address before: BYD 518118 Shenzhen Road, Guangdong province Pingshan New District No. 3009 Patentee before: BYD Co.,Ltd. |
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Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: BYD Semiconductor Co.,Ltd. |
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Granted publication date: 20130102 |