CN102968217B - The datum renewal method of touch-screen, system and touch control terminal - Google Patents
The datum renewal method of touch-screen, system and touch control terminal Download PDFInfo
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
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Abstract
The present invention relates to technical field of touch control, provide a kind of datum renewal method of touch-screen, comprising: eigenwert during backup steady state (SS); Touch-screen is powered on the original value of sampling as reference value to set up benchmark, and calculate upper electrical characteristic values; Upper electrical characteristic values is done with backup eigenwert and differs from and take absolute value, find out the maximal value in absolute value; Judge whether maximal value is greater than the first threshold of setting, if maximal value is greater than the first threshold of setting, then judge that current base is incorrect; If current base is incorrect, judge whether touch-screen has touch, if no touch, then timing upgrades benchmark, if there is touch, whether unanimously with backup eigenwert then monitor the current characteristic value obtained according to the raw calculation of present sample in real time, when current characteristic value is consistent with backup eigenwert, upgrade benchmark.The invention enables touch control chip when reality detects, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark.
Description
Technical field
The present invention relates to technical field of touch control, particularly relate to a kind of datum renewal method of touch-screen, system and touch control terminal.
Background technology
Along with the development of touch technology and terminal technology, increasing terminal device adopts touch control manner to carry out man-machine interaction.At present, the touch-screen that terminal device adopts mainly contains capacitance touch screen and electric resistance touch screen two kinds, and wherein capacitive touch screen is with its good sharpness, transmittance and sense of touch, obtains the favor of more and more user.
Capacitance touch screen is in detection touch process, and touch control chip first obtains raw data by ADC (Analog-to-DigitalConverter, A-D converter) sampling, obtains original value; Set up benchmark according to original value again, obtain reference value; In follow-up calculating, deduct original value by reference value, obtain difference, can coordinate figure be calculated by difference.In order to correct difference can be obtained, need to safeguard a correct benchmark, also namely for normative original value should be capacitance touch screen be in steady state (SS) time the original value that samples, state when steady state (SS) to refer on capacitance touch screen that not finger, felt pen, water droplet etc. can change the object of original value size.And in actual use, capacitance touch screen can because there be the existence of the situations such as touch when screen having water droplet, hand perspiration and powers on, make accessed benchmark incorrect, thus causing sensitivity of touch screen to be deteriorated or wrong report point, wrong report point refers to actual touch the in certain position on capacitance touch screen and touch control chip has calculated coordinate.
Particularly, touch-control system after the power-up, needs first to set up a initial baseline, and the original value being about to first time sampling after powering on directly uses as reference value; After setting up initial baseline, in follow-up sampling calculates, according to the data variation rule of difference, then upgrade benchmark, upgrade benchmark and refer to using the original value of present sample as reference value, follow-up sampling calculates with this original value as a reference.As shown in Figure 1, be the workflow diagram of capacitance touch screen, after touch control chip first obtains original value by ADC sampling, judge whether it is sample first after powering on, if so, then using this sample original value as benchmark, otherwise, benchmark and original value are done difference and obtain difference, then calculate coordinate, then judge whether to need to upgrade benchmark according to the data variation rule of difference, if desired then using this sample original value as benchmark, otherwise, terminate this flow process, continue to sample next time.System is when powering on, owing to can not determine now whether screen has finger or water droplet etc., can make to get when having finger or water droplet on shielding a wrong benchmark, and in follow-up processing procedure, after finger leaves or water droplet is dried, benchmark should be able to be upgraded fast.If screen is in steady state (SS) when powering on, and in follow-up use procedure, owing to shielding upper environmental change, as temperature variation, or when screen has water droplet or a sweat point, in order to capacitance touch screen normal running can be made, need environmentally to upgrade benchmark, such as, when capacitance plate temperature changes with the temperature of place environment, the original value of sampling also can change accordingly change tread, now often the regular hour needs renewal one secondary standard excessively, in order to avoid touch insensitive or wrong report point.If when datum renewal, the benchmark got is made mistakes, then sensitivity of touch screen likely can be caused to be deteriorated or report the appearance of some phenomenon by mistake.Therefore, how correctly can obtain reference value, be the key point that can capacitance touch screen touch control chip normally detect.
Summary of the invention
The present invention is directed to the above-mentioned defect of prior art, a kind of datum renewal method of touch-screen is provided, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark.The present invention adopts following technical scheme:
A datum renewal method for touch-screen, described method comprises the steps:
When touch-screen is in steady state (SS), each sampled point is sampled, obtain the original value of steady state (SS) sampling, obtain the eigenwert of each sampled point of described touch-screen according to the raw calculation that described steady state (SS) is sampled and back up, obtain backing up eigenwert;
Touch-screen powers on, and samples to each sampled point, the original value of the sampling that obtains powering on, using the original value of the described sampling that powers on as reference value to set up benchmark, and obtain the upper electrical characteristic values of each sampled point of described touch-screen according to the described raw calculation powering on sampling;
Described upper electrical characteristic values is done with backup eigenwert and differs from and take absolute value, find out the maximal value in described absolute value;
Judge whether described maximal value is greater than the first threshold of setting, if described maximal value is greater than the first threshold of setting, then judge that current base is incorrect;
If current base is incorrect, judge whether touch-screen has touch, if no touch, then timing upgrades benchmark, if there is touch, then monitors the change of the original value of present sample in real time, upgrades benchmark when the original value of present sample meets datum renewal condition.
Present invention also offers a kind of datum renewal system of touch-screen, comprising:
Sampling unit, for sampling to each sampled point, obtains the original value of sampling;
Computing unit, raw calculation for sampling according to steady state (SS) obtains the eigenwert of each sampled point of touch-screen, the raw calculation of each time point sampling obtains the current characteristic value of touch-screen each sampled point when powering on according to touch-screen and after powering on, and current characteristic value and backup eigenwert are done and differed from and take absolute value, find out the maximal value in described absolute value;
Backup units, for backing up eigenwert during steady state (SS), obtains backing up eigenwert;
Reference value sets up unit, during for touch-screen is powered on sampling original value as reference value to set up benchmark;
Judging unit, whether the maximal value calculated for the sampling judged when powering on according to touch-screen is greater than the first threshold of setting, if described maximal value is greater than the first threshold of setting, then judges that current base is incorrect, and judge when current base is incorrect whether touch-screen has touch;
Reference value updating block, for incorrect and on touch-screen during no touch at current base, timing upgrades benchmark, and, touch-screen incorrect at current base has touch and the original value of present sample meets datum renewal condition time upgrade benchmark;
Monitoring unit, for incorrect and when touch-screen having touch at current base, the change of the original value of monitoring present sample in real time.
Present invention also offers a kind of touch control terminal, described touch control terminal comprises the datum renewal system of above-mentioned touch-screen.
The present invention passes through the eigenwert during steady state (SS) of backup touch-screen, sampled value and backup eigenwert are compared, the correctness of judgment standard, makes touch control chip when reality detects, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark.
Accompanying drawing explanation
Fig. 1 is the workflow diagram of capacitance touch screen;
Fig. 2 is the process flow diagram of the datum renewal method of embodiment 1 touch-screen;
Fig. 3 is that in embodiment 1, the incorrect and touch-screen of determinating reference has the method flow diagram upgrading benchmark during touch;
Fig. 4 is the process flow diagram of the datum renewal method of embodiment 2 touch-screen;
Fig. 5 is that in embodiment 2, the incorrect and touch-screen of determinating reference has the method flow diagram upgrading benchmark during touch;
Fig. 6 is the process flow diagram of the datum renewal method of embodiment 3 touch-screen;
Fig. 7 is that in embodiment 3, the incorrect and touch-screen of determinating reference has the method flow diagram upgrading benchmark during touch;
Fig. 8 is the structured flowchart of the datum renewal system of embodiment 4 touch-screen.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention passes through the eigenwert during steady state (SS) of backup touch-screen, sampled value and backup eigenwert are compared, the correctness of judgment standard, makes touch control chip when reality detects, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark.Eigenwert can be the original value etc. of ratio value between the original value of difference value between the original value of touch-screen neighbouring sample point sampling, touch-screen neighbouring sample point sampling or each sampled point sampling of touch-screen.Below respectively for above-mentioned 3 kinds of eigenwerts, technical solution of the present invention is described in detail.
embodiment 1:
In the present embodiment, eigenwert is the difference value between the original value of touch-screen neighbouring sample point sampling.Referring to shown in Fig. 2, is the process flow diagram of the datum renewal method of the embodiment of the present invention 1 touch-screen.The method comprises the steps:
Step S101: steady state (SS) is sampled, and calculates the difference value of adjacent sampled point during steady state (SS) and backs up.
In this step, when touch-screen is in steady state (SS), each sampled point is sampled, obtain the original value of steady state (SS) sampling, the raw calculation of sampling according to steady state (SS) again obtains the difference value between the original value of touch-screen neighbouring sample point sampling, back up this difference value, as the reference quantity of datum renewal, make touch control chip when reality detects, correct reference value can be got rapidly and accurately.This difference value can back-up storage in the nonvolatile memory of touch control chip, such as FlashMemory (flash memory), PROM (Programmableread-onlymemory, programmable read only memory), EAROM (Electricallyalterablereadonlymemory, electrically-alterable ROM (EAROM)), EPROM (Erasableprogrammablereadonlymemory, EPROM (Erasable Programmable Read Only Memory)) or EEPROM (Electricallyerasableprogrammablereadonlymemory, EEPROM (Electrically Erasable Programmable Read Only Memo)) etc., in the present embodiment, difference value back-up storage is in the FlashMemory of touch control chip.
Citing is below described.If the original value that capacitance touch screen is sampled when steady state (SS) is as shown in the table, wherein the first behavior sampled point numbering, the original value of each sampled point of the second behavior:
The original value of table 1 steady state (SS) sampling
| Numbering | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 |
| Original value | 2100 | 2050 | 1900 | 1950 | 2010 | 2200 | 1920 | 2010 | 2300 | 2100 |
Now touch control chip backs up reference data in FlashMemory, difference value between the original value of touch-screen neighbouring sample point sampling during steady state (SS) is stored in FlashMemory, namely difference value back_diff [i]=S [i+1]-S [i] is backed up, wherein back_diff [i] is abbreviated as B [i], as shown in the table:
Table 2 backs up difference value
| Numbering | B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8 |
| Backup value | -50 | -150 | 50 | 60 | 190 | -280 | 90 | 290 | -200 |
The foundation of this backup has two kinds of modes, one is before touch-screen dispatches from the factory, factory is when guaranteeing screen does not touch and is in steady state (SS), current reference value is done difference, obtain back_diff [i], do not calibrate when another kind is and dispatches from the factory, the automatic learning by software in product use procedure obtains, and it is comparatively complicated which compares first kind of way.
Step S102: power on sampling, sets up benchmark, calculates the difference value of adjacent sampled point when powering on.
In this step, after touch-screen powers on, each sampled point is sampled, obtain the original value of sampling that powers on, using the original value of the sampling that powers on as reference value to set up benchmark, and the difference value between the original value obtaining touch-screen neighbouring sample point sampling according to the raw calculation of the sampling that powers on.
If system has water on shielding before powering on, and when powering on, the original value of first time sampling is as shown in the table, will get the benchmark of mistake after so powering on:
The original value of sampling when table 3 powers on
| Numbering | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 |
| Original value | 2100 | 2050 | 2000 | 2250 | 2130 | 2200 | 1920 | 2010 | 2300 | 2100 |
Now as the neighbouring sample point sampling of benchmark original value between difference value as following table:
The difference value of sampling when table 4 powers on
| Numbering | B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8 |
| Difference value | -50 | -50 | 250 | -120 | 70 | -280 | 90 | 290 | -200 |
Step S103: difference value when powering on is done with backup difference value and differs from and take absolute value, find out the maximal value in absolute value.
Similarity degree between the backup difference value that the present embodiment is powered in the difference value of current base neighbouring sample point and FlashMemory by comparison, judges that whether current benchmark is correct.To differ from and the mode taken absolute value carrys out its similarity degree of comparison particular by both are done.In this step, the difference value of sampling when powering in table 4 is done with the backup difference value in table 2FlashMemory and differs from and get its absolute value, find out the maximal value in absolute value.
Step S104: judge whether this maximal value is greater than first threshold, if so, performs step S105, otherwise, illustrate that benchmark is correct, terminate this flow process, undertaken by the normal workflow that touches.
In this step, judge that whether current benchmark is correct by the threshold value comparing maximal value and setting.Wherein, first threshold sets according to the result of reality debugging in the design process, can no longer change after setting.
Step S105: current base is incorrect.
Maximal value is greater than first threshold, illustrates that now current benchmark is incorrect.
Step S106: judged whether touch, if so, performs step S107, otherwise, perform step S108.
When current base is incorrect, continue to judge whether touch-screen has touch.Specifically judge by following method:
Sample to each sampled point, obtain the original value of present sample, the original value deducting present sample with present reference value obtains difference;
Judge whether this difference is less than the Second Threshold of setting;
If this difference is less than the Second Threshold of setting, be then judged to be no touch, otherwise, be judged to be touch.
Wherein, Second Threshold sets according to the result of reality debugging in the design process, can no longer change after setting.
Step S107: the change of the original value of monitoring present sample in real time, upgrades benchmark when the original value of present sample meets datum renewal condition.
When touch-screen has a touch, needing the change of the original value of monitoring present sample in real time, when the original value of present sample meets datum renewal condition, illustrating that current original value is more suitable for for doing reference amount, need to upgrade benchmark at once, benchmark wrong is before substituted.Datum renewal condition can set according to actual conditions, be not limited to one, such as by calculating current characteristic value, the reference characteristic value difference respectively and between backup eigenwert, if current characteristic value is less with the difference of backup eigenwert than reference characteristic value with the difference of backup eigenwert, and the variable quantity between these two differences more than a setting value time, then think that the original value of present sample meets datum renewal condition, be more suitable for doing benchmark, now renewable benchmark.Concrete grammar is as shown in Figure 3:
Steps A 101: judge whether that benchmark is incorrect and have touch, if so, performs steps A 102, otherwise, terminate this flow process, undertaken by the normal workflow that touches.
Steps A 102: sampling, calculates the difference value of current neighbouring sample point and calculate reference difference score value according to reference value.
This step is sampled to each sampled point, obtain the original value of present sample, difference value between the original value obtaining current touch screen neighbouring sample point sampling according to the raw calculation of present sample, i.e. diff_cur [i]=rawdata [i+1]-rawdata [i]; And the difference value between the reference value calculating touch-screen neighbouring sample point sampling according to reference value, i.e. diff_ref [i]=refdata [i+1]-refdata [i].
Steps A 103: current difference value, reference difference score value are done with backup difference value respectively and differs from and take absolute value.
Difference value between original value current touch being shielded neighbouring sample point sampling does with backup difference value and differs from and take absolute value, be i.e. diff_c [i]=Abs (diff_cur [i]-back_diff [i]); And the difference value between the reference value of touch-screen neighbouring sample point sampling and backup difference value are done and differ from and take absolute value, be i.e. diff_r [i]=Abs (diff_ref [i]-back_diff [i]).
Steps A 104: find out the maximal value in two groups of absolute values respectively.
This step counts the maximal value in two groups of absolute difference respectively, and the maximal value wherein in diff_c [i] is the maximal value in the first maximal value diff_cmax, diff_r [i] is the second maximal value diff_rmax.
Steps A 105: judge whether the first maximal value is less than the second maximal value, if so, performs steps A 106, otherwise, return and perform steps A 102.
In this step, when the first maximal value diff_cmax is less than the second maximal value diff_rmax, current original value is described progressively close to backup value; Otherwise, illustrate that sampling original value now does not improve, need resampling.
Steps A 106: judge whether the absolute value of the difference of the second maximal value and the first maximal value is greater than the 3rd threshold value, if so, performs steps A 107, otherwise, return and perform steps A 102.
In this step, judge whether the original value of present sample meets datum renewal condition by a threshold value of the absolute value and setting that compare the difference of the second maximal value diff_rmax and the first maximal value diff_cmax further.Wherein, the 3rd threshold value sets according to the result of reality debugging in the design process, can no longer change after setting.If the difference of the second maximal value diff_rmax and the first maximal value diff_cmax is not more than the 3rd threshold value, illustrates that sampling original value does not now meet datum renewal condition, need resampling.
Steps A 107: have wrong report point, forces renewal one secondary standard.
When the absolute value of the difference of the second maximal value diff_rmax and the first maximal value diff_cmax is greater than the 3rd threshold value of setting, illustrate that currency is the original value not having touch condition, current touch is wrong report point, now do not perform touch operation, and need to force renewal one secondary standard, thus elimination wrong report is put and recovers correct benchmark.
Step S108: timing upgrades benchmark.
If no touch, often through predetermined time interval, the original value of present sample is replaced present reference value to upgrade benchmark.
The present embodiment is by the difference value between the original value of touch-screen neighbouring sample point sampling during backup steady state (SS), the difference value of difference value when powering on and between the original value of each sampled point sampling after powering on and backup is compared, the correctness of judgment standard, make touch control chip when reality detects, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark.
embodiment 2:
In the present embodiment, eigenwert is the ratio value between the original value of touch-screen neighbouring sample point sampling.Referring to shown in Fig. 4, is the process flow diagram of the datum renewal method of the embodiment of the present invention 2 touch-screen.The method comprises the steps:
Step S201: steady state (SS) is sampled, and calculates the ratio value of adjacent sampled point during steady state (SS) and backs up.
In this step, when touch-screen is in steady state (SS), each sampled point is sampled, obtain the original value of steady state (SS) sampling, the raw calculation of sampling according to steady state (SS) again obtains the ratio value between the original value of touch-screen neighbouring sample point sampling, back up this ratio value, as the reference quantity of datum renewal, make touch control chip when reality detects, correct reference value can be got rapidly and accurately.This ratio value be amplification one set the neighbouring sample point sampling of multiple original value between ratio.In the present embodiment, ratio value back-up storage is in the FlashMemory of touch control chip.
Citing is below described.If the original value that capacitance touch screen is sampled when steady state (SS) is as shown in the table, wherein the first behavior sampled point numbering, the original value of each sampled point of the second behavior:
The original value of table 5 steady state (SS) sampling
| Numbering | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 |
| Original value | 2100 | 2050 | 1900 | 1950 | 2010 | 2200 | 1920 | 2010 | 2300 | 2100 |
Now touch control chip backs up reference data in FlashMemory, ratio value between the original value of touch-screen neighbouring sample point sampling during steady state (SS) is stored in FlashMemory, due to MCU (MicroControlUnit, micro-control unit) be difficult to process decimal, a setting multiple need be amplified by asking the result of ratio, to obtain an integer, the enlargement factor of this setting can adjust according to actual conditions, such as but not limited to will the result of ratio be asked to amplify S [0] doubly, namely ratio value back_diff [i]=(S [i+1]/S [i]) * S [0] is backed up, wherein back_diff [i] is abbreviated as B [i], as shown in the table:
Table 6 backs up ratio value
| Numbering | B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8 |
| Backup value | 2050 | 1946 | 2155 | 2164 | 2298 | 1832 | 2198 | 2402 | 1917 |
The foundation of this backup has two kinds of modes, one is before touch-screen dispatches from the factory, factory is when guaranteeing screen does not touch and is in steady state (SS), current reference value is done difference, obtain back_diff [i], do not calibrate when another kind is and dispatches from the factory, the automatic learning by software in product use procedure obtains, and it is comparatively complicated which compares first kind of way.
Step S202: power on sampling, sets up benchmark, calculates the ratio value of adjacent sampled point when powering on.
In this step, after touch-screen powers on, each sampled point is sampled, obtain the original value of sampling that powers on, using the original value of the sampling that powers on as reference value to set up benchmark, and the ratio value between the original value obtaining touch-screen neighbouring sample point sampling according to the raw calculation of the sampling that powers on.
If system has water on shielding before powering on, and when powering on, the original value of first time sampling is as shown in the table, will get the benchmark of mistake after so powering on:
The original value of sampling when table 7 powers on
| Numbering | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 |
| Original value | 2100 | 2050 | 2000 | 2250 | 2130 | 2200 | 1920 | 2010 | 2300 | 2100 |
Now as the neighbouring sample point sampling of benchmark original value between ratio value as following table (amplifying):
The ratio value of sampling when table 8 powers on
| Numbering | B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8 |
| Ratio value | 2050 | 2048 | 2362 | 1988 | 2169 | 1832 | 2198 | 2402 | 1917 |
Step S203: ratio value when powering on is done with backup ratio value and differs from and take absolute value, find out the maximal value in absolute value.
Similarity degree between the backup ratio value that the present embodiment is powered in the ratio value of current base neighbouring sample point and FlashMemory by comparison, judges that whether current benchmark is correct.To differ from and the mode taken absolute value carrys out its similarity degree of comparison particular by both are done.In this step, the ratio value of sampling when powering in table 8 is done with the backup ratio value in table 6FlashMemory and differs from and get its absolute value, find out the maximal value in absolute value.
Step S204: judge whether this maximal value is greater than first threshold, if so, performs step S205, otherwise, illustrate that benchmark is correct, terminate this flow process, undertaken by the normal workflow that touches.
In this step, judge that whether current benchmark is correct by the threshold value comparing maximal value and setting.Wherein, first threshold sets according to the result of reality debugging in the design process, can no longer change after setting.
Step S205: current base is incorrect.
Maximal value is greater than first threshold, illustrates that now current benchmark is incorrect.
Step S206: judged whether touch, if so, performs step S207, otherwise, perform step S208.
When current base is incorrect, continue to judge whether touch-screen has touch.Specifically judge by following method:
Sample to each sampled point, obtain the original value of present sample, the original value deducting present sample with present reference value obtains difference;
Judge whether this difference is less than the Second Threshold of setting;
If this difference is less than the Second Threshold of setting, be then judged to be no touch, otherwise, be judged to be touch.
Wherein, Second Threshold sets according to the result of reality debugging in the design process, can no longer change after setting.
Step S207: the change of the original value of monitoring present sample in real time, upgrades benchmark when the original value of present sample meets datum renewal condition.
When touch-screen has a touch, needing the change of the original value of monitoring present sample in real time, when the original value of present sample meets datum renewal condition, illustrating that current original value is more suitable for for doing reference amount, need to upgrade benchmark at once, benchmark wrong is before substituted.Datum renewal condition can set according to actual conditions, be not limited to one, such as by calculating current characteristic value, the reference characteristic value difference respectively and between backup eigenwert, if current characteristic value is less with the difference of backup eigenwert than reference characteristic value with the difference of backup eigenwert, and the variable quantity between these two differences more than a setting value time, then think that the original value of present sample meets datum renewal condition, be more suitable for doing benchmark, now renewable benchmark.Concrete grammar is as shown in Figure 5:
Steps A 201: judge whether that benchmark is incorrect and have touch, if so, performs steps A 202, otherwise, terminate this flow process, undertaken by the normal workflow that touches.
Steps A 202: sampling, calculates the ratio value of current neighbouring sample point and calculate baseline scale value according to reference value.
This step is sampled to each sampled point, obtain the original value of present sample, ratio value between the original value obtaining current touch screen neighbouring sample point sampling according to the raw calculation of present sample, i.e. prop_cur [i]=rawdata [i+1]/rawdata [i] * rawdata [0]; And the ratio value between the reference value calculating touch-screen neighbouring sample point sampling according to reference value, i.e. prop_ref [i]=refdata [i+1]/refdata [i] * refdata [0].
Steps A 203: current ratio value, baseline scale value are done with backup ratio value respectively and differs from and take absolute value.
Ratio value between original value current touch being shielded neighbouring sample point sampling does with backup ratio value and differs from and take absolute value, be i.e. diff_c [i]=Abs (prop_cur [i]-back_prop [i]); And the ratio value between the reference value of touch-screen neighbouring sample point sampling and backup ratio value are done and differ from and take absolute value, be i.e. diff_r [i]=Abs (prop_ref [i]-back_prop [i]).
Steps A 204: find out the maximal value in two groups of absolute values respectively.
This step counts the maximal value in two groups of absolute difference respectively, and the maximal value wherein in diff_c [i] is the maximal value in the first maximal value diff_cmax, diff_r [i] is the second maximal value diff_rmax.
Steps A 205: judge whether the first maximal value is less than the second maximal value, if so, performs steps A 206, otherwise, return and perform steps A 202.
In this step, when the first maximal value diff_cmax is less than the second maximal value diff_rmax, current original value is described progressively close to backup value; Otherwise, illustrate that sampling original value now does not improve, need resampling.
Steps A 206: judge whether the absolute value of the difference of the second maximal value and the first maximal value is greater than the 3rd threshold value, if so, performs steps A 207, otherwise, return and perform steps A 202.
In this step, judge whether the original value of present sample meets datum renewal condition by a threshold value of the absolute value and setting that compare the difference of the second maximal value diff_rmax and the first maximal value diff_cmax further.Wherein, the 3rd threshold value sets according to the result of reality debugging in the design process, can no longer change after setting.If the difference of the second maximal value diff_rmax and the first maximal value diff_cmax is not more than the 3rd threshold value, illustrates that sampling original value does not now meet datum renewal condition, need resampling.
Steps A 207: have wrong report point, forces renewal one secondary standard.
When the absolute value of the difference of the second maximal value diff_rmax and the first maximal value diff_cmax is greater than the 3rd threshold value of setting, illustrate that currency is the original value not having touch condition, current touch is wrong report point, now do not perform touch operation, and need to force renewal one secondary standard, thus elimination wrong report is put and recovers correct benchmark.
Step S208: timing upgrades benchmark.
If no touch, often through predetermined time interval, the original value of present sample is replaced present reference value to upgrade benchmark.
The present embodiment is by the ratio value between the original value of touch-screen neighbouring sample point sampling during backup steady state (SS), the ratio value of ratio value when powering on and between the original value of each sampled point sampling after powering on and backup is compared, the correctness of judgment standard, make touch control chip when reality detects, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark.
embodiment 3:
In the present embodiment, eigenwert is the original value of each sampled point sampling of touch-screen.Referring to shown in Fig. 6, is the process flow diagram of the datum renewal method of the embodiment of the present invention 3 touch-screen.The method comprises the steps:
Step S301: steady state (SS) is sampled, obtains the original value of each sampled point sampling during steady state (SS) and backs up.
In this step, when touch-screen is in steady state (SS), each sampled point is sampled, obtain the original value of each sampled point sampling of steady state (SS), back up this original value, as the reference quantity of datum renewal, make touch control chip when reality detects, correct reference value can be got rapidly and accurately.In the present embodiment, original value back-up storage is in the FlashMemory of touch control chip.The present embodiment without the need to carrying out complicated calculations, directly using sampling original value as backup eigenwert.
Citing is below described.If the original value that capacitance touch screen is sampled when steady state (SS) is as shown in the table, wherein the first behavior sampled point numbering, the original value of each sampled point of the second behavior:
The original value of table 9 steady state (SS) sampling
| Numbering | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 |
| Original value | 2100 | 2050 | 1900 | 1950 | 2010 | 2200 | 1920 | 2010 | 2300 | 2100 |
Now touch control chip backs up reference data in FlashMemory, the original value of touch-screen neighbouring sample point sampling during steady state (SS) is stored in FlashMemory, namely original value back_diff [i]=S [i] is backed up, wherein back_diff [i] is abbreviated as B [i], as shown in the table:
Table 10 backs up original value
| Numbering | B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8 |
| Backup value | 2100 | 2050 | 1900 | 1950 | 2010 | 2200 | 1920 | 2010 | 2300 |
The foundation of this backup has two kinds of modes, one is before touch-screen dispatches from the factory, factory is when guaranteeing screen does not touch and is in steady state (SS), current reference value is done difference, obtain back_diff [i], do not calibrate when another kind is and dispatches from the factory, the automatic learning by software in product use procedure obtains, and it is comparatively complicated which compares first kind of way.
Step S302: power on sampling, the original value of each sampled point sampling when obtaining powering on, sets up benchmark.
In this step, after touch-screen powers on, each sampled point is sampled, the original value of the sampling that obtains powering on, using the original value of the sampling that powers on as reference value to set up benchmark.
If system has water on shielding before powering on, and when powering on, the original value of first time sampling is as shown in the table, will get the benchmark of mistake after so powering on:
The original value of sampling when table 11 powers on
| Numbering | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 |
| Original value | 2100 | 2050 | 2000 | 2250 | 2130 | 2200 | 1920 | 2010 | 2300 | 2100 |
Step S303: original value when powering on is done with backup original value and differs from and take absolute value, find out the maximal value in absolute value.
Similarity degree between the backup original value that the present embodiment is powered in the original value of each sampled point of current base and FlashMemory by comparison, judges that whether current benchmark is correct.To differ from and the mode taken absolute value carrys out its similarity degree of comparison particular by both are done.In this step, the original value of sampling when powering in table 11 is done with the backup original value in table 10FlashMemory and differs from and get its absolute value, find out the maximal value in absolute value, as shown in the table:
Table 12 absolute value
| Absolute value | 0 | 0 | 100 | 300 | 120 | 0 | 0 | 0 | 0 | 0 |
Step S304: judge whether this maximal value is greater than first threshold, if so, performs step S305, otherwise, illustrate that benchmark is correct, terminate this flow process, undertaken by the normal workflow that touches.
In this step, judge that whether current benchmark is correct by the threshold value comparing maximal value and setting.Wherein, first threshold sets according to the result of reality debugging in the design process, can no longer change after setting.
Step S305: current base is incorrect.
Maximal value is greater than first threshold, illustrates that now current benchmark is incorrect.
Step S306: judged whether touch, if so, performs step S307, otherwise, perform step S308.
When current base is incorrect, continue to judge whether touch-screen has touch.Specifically judge by following method:
Sample to each sampled point, obtain the original value of present sample, the original value deducting present sample with present reference value obtains difference;
Judge whether this difference is less than the Second Threshold of setting;
If this difference is less than the Second Threshold of setting, be then judged to be no touch, otherwise, be judged to be touch.
Wherein, Second Threshold sets according to the result of reality debugging in the design process, can no longer change after setting.
Step S307: the change of the original value of monitoring present sample in real time, upgrades benchmark when the original value of present sample meets datum renewal condition.
When touch-screen has a touch, needing the change of the original value of monitoring present sample in real time, when the original value of present sample meets datum renewal condition, illustrating that current original value is more suitable for for doing reference amount, need to upgrade benchmark at once, benchmark wrong is before substituted.Datum renewal condition can set according to actual conditions, be not limited to one, such as by calculating original value, the difference of reference value respectively and between backup original value of present sample, if the original value of present sample is less with the difference of backup original value than reference value with the difference of backup original value, and the variable quantity between these two differences more than a setting value time, then think that the original value of present sample meets datum renewal condition, be more suitable for doing benchmark, now renewable benchmark.Concrete grammar is as shown in Figure 7:
Steps A 301: judge whether that benchmark is incorrect and have touch, if so, performs steps A 302, otherwise, terminate this flow process, undertaken by the normal workflow that touches.
Steps A 302: sampling, obtains the original value of current each sampled point.
This step is sampled to each sampled point, obtains the original value rawdata [i] of current each sampled point.
Steps A 303: current original value, reference value are done with backup original value respectively and differs from and take absolute value.
Original value current touch being shielded the sampling of each sampled point does with backup original value and differs from and take absolute value, be i.e. diff_c [i]=Abs (rawdata [i]-back_base [i]); And the reference value of each for touch-screen sampled point and backup original value are done and differed from and take absolute value, be i.e. diff_r [i]=Abs (refdata [i]-back_diff [i]).
Steps A 304: find out the maximal value in two groups of absolute values respectively.
This step counts the maximal value in two groups of absolute difference respectively, and the maximal value wherein in diff_c [i] is the maximal value in the first maximal value diff_cmax, diff_r [i] is the second maximal value diff_rmax.
Steps A 305: judge whether the first maximal value is less than the second maximal value, if so, performs steps A 306, otherwise, return and perform steps A 302.
In this step, when the first maximal value diff_cmax is less than the second maximal value diff_rmax, current original value is described progressively close to backup value; Otherwise, illustrate that sampling original value now does not improve, need resampling.
Steps A 306: judge whether the absolute value of the difference of the second maximal value and the first maximal value is greater than the 3rd threshold value, if so, performs steps A 307, otherwise, return and perform steps A 302.
In this step, judge whether the original value of present sample meets datum renewal condition by a threshold value of the absolute value and setting that compare the difference of the second maximal value diff_rmax and the first maximal value diff_cmax further.Wherein, the 3rd threshold value sets according to the result of reality debugging in the design process, can no longer change after setting.If the difference of the second maximal value diff_rmax and the first maximal value diff_cmax is not more than the 3rd threshold value, illustrates that sampling original value does not now meet datum renewal condition, need resampling.
Steps A 307: have wrong report point, forces renewal one secondary standard.
When the absolute value of the difference of the second maximal value diff_rmax and the first maximal value diff_cmax is greater than the 3rd threshold value of setting, illustrate that currency is the original value not having touch condition, current touch is wrong report point, now do not perform touch operation, and need to force renewal one secondary standard, thus elimination wrong report is put and recovers correct benchmark.Step S308: timing upgrades benchmark.
If no touch, often through predetermined time interval, the original value of present sample is replaced present reference value to upgrade benchmark.
The present embodiment is by the original value of each sampled point sampling of touch-screen during backup steady state (SS), original value of sampled point sampling each when powering on and after powering on and the original value of backup are compared, the correctness of judgment standard, make touch control chip when reality detects, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark.
embodiment 4:
Present embodiments provide a kind of datum renewal system of touch-screen, as shown in Figure 8, this system comprises: sampling unit 1, computing unit 2, backup units 3, reference value set up unit 4, judging unit 5, reference value updating block 6 and monitoring unit 7.Wherein, sampling unit 1, for sampling to each sampled point, obtains the original value of sampling; Computing unit 2 obtains the eigenwert of each sampled point of touch-screen for the raw calculation of sampling according to steady state (SS), the raw calculation of each time point sampling obtains the current characteristic value of touch-screen each sampled point when powering on according to touch-screen and after powering on, and current characteristic value and backup eigenwert are done and differed from and take absolute value, find out the maximal value in absolute value; Backup units 3, for backing up eigenwert during steady state (SS), obtains backing up eigenwert; When reference value sets up unit 4 for being powered on by touch-screen sampling original value as reference value to set up benchmark; Whether judging unit 5 is greater than the first threshold of setting for the maximal value that the sampling judged when powering on according to touch-screen calculates, if maximal value is greater than the first threshold of setting, then judge that current base is incorrect, and judge when current base is incorrect whether touch-screen has touch; Reference value updating block 6 is for incorrect and on touch-screen during no touch at current base, and timing upgrades benchmark, and, touch-screen incorrect at current base has touch and the original value of present sample meets datum renewal condition time upgrade benchmark; Monitoring unit 7 for incorrect and when touch-screen having touch at current base, the change of the original value of monitoring present sample in real time.
In the present embodiment, the original value of computing unit 2 also for deducting present sample with present reference value obtains difference, and difference is for judging whether touch-screen has touch.By the Second Threshold judging difference and whether be less than setting, judging unit 5 judges whether touch-screen has touch, if difference is less than the Second Threshold of setting, be then judged to be no touch, otherwise, be judged to be touch.
Computing unit 2 also differs from for reference characteristic value being done with backup eigenwert and takes absolute value, and finds out the maximal value in described absolute value.Judging unit 5 is also for when current characteristic value and the backup eigenwert maximal value done in poor absolute value are less than reference characteristic value and backup eigenwert does the maximal value in poor absolute value, judge whether the absolute value of the difference of described two maximal values is greater than the 3rd threshold value of setting, if the absolute value of described difference is greater than the 3rd threshold value of setting, then the original value of present sample is replaced present reference value to upgrade benchmark, and judge that current touch is as wrong report point, does not perform touch operation.
Eigenwert can be the original value of ratio value between the original value of difference value between the original value of touch-screen neighbouring sample point sampling, touch-screen neighbouring sample point sampling or each sampled point sampling of touch-screen.During ratio value between the original value that eigenwert is touch-screen neighbouring sample point sampling, ratio value be amplification one set the neighbouring sample point sampling of multiple original value between ratio.
Difference value can back-up storage in the nonvolatile memory of touch control chip, such as FlashMemory, PROM, EAROM, EPROM or EEPROM etc., in the present embodiment, difference value back-up storage is in the FlashMemory of touch control chip.
The present embodiment passes through the eigenwert during steady state (SS) of backup touch-screen, sampled value and backup eigenwert are compared, the correctness of judgment standard, makes touch control chip when reality detects, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark.
embodiment 5:
Present embodiments provide a kind of touch control terminal, this touch control terminal comprises the datum renewal system of the touch-screen that embodiment 4 provides.
The present embodiment passes through the eigenwert during steady state (SS) of backup touch-screen, sampled value and backup eigenwert are compared, the correctness of judgment standard, make touch control chip when reality detects, correct reference value can be got rapidly and accurately, thus correctly upgrade benchmark, make the touch accuracy rate of this touch control terminal high, Consumer's Experience is good.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a datum renewal method for touch-screen, is characterized in that, described method comprises the steps:
When touch-screen is in steady state (SS), each sampled point is sampled, obtain the original value of steady state (SS) sampling, obtain the initial characteristic values of each sampled point of described touch-screen according to the raw calculation that described steady state (SS) is sampled and back up, obtain backing up eigenwert;
Touch-screen powers on, and samples to each sampled point, the original value of the sampling that obtains powering on, using the original value of the described sampling that powers on as reference value to set up benchmark, and obtain the upper electrical characteristic values of each sampled point of described touch-screen according to the described raw calculation powering on sampling;
Described upper electrical characteristic values is done with backup eigenwert and differs from and take absolute value, find out the maximal value in described absolute value;
Judge whether described maximal value is greater than the first threshold of setting, if described maximal value is greater than the first threshold of setting, then judge that current base is incorrect;
If current base is incorrect, judge whether touch-screen has touch, if no touch, then timing upgrades benchmark, if there is touch, then monitors the change of the original value of present sample in real time, upgrades benchmark when the original value of present sample meets datum renewal condition;
The change of the original value of described real-time monitoring present sample, the step upgrading benchmark when the original value of present sample meets datum renewal condition is specially:
Each sampled point is sampled, obtains the original value of present sample, obtain the current characteristic value of each sampled point of described touch-screen according to the raw calculation of described present sample, and calculate the reference characteristic value of each sampled point of described touch-screen according to present reference value
Described current characteristic value is done with backup eigenwert and differs from and take absolute value, find out the maximal value in described absolute value, obtain the first maximal value; Described reference characteristic value is done with backup eigenwert and differs from and take absolute value, find out the maximal value in described absolute value, obtain the second maximal value;
When described first maximal value is less than the second maximal value, judge whether the absolute value of the difference of described second maximal value and the first maximal value is greater than the 3rd threshold value of setting, if the absolute value of described difference is greater than the 3rd threshold value of setting, then the original value of present sample is replaced present reference value to upgrade benchmark, and judge that current touch is as wrong report point, does not perform touch operation.
2. the datum renewal method of touch-screen according to claim 1, is characterized in that, describedly judges whether touch-screen has the step of touch be specially:
Sample to each sampled point, obtain the original value of present sample, the original value deducting present sample with present reference value obtains difference;
Judge whether described difference is less than the Second Threshold of setting;
If described difference is less than the Second Threshold of setting, be then judged to be no touch, otherwise, be judged to be touch.
3. the datum renewal method of touch-screen according to claim 1, is characterized in that, if described no touch, then the step of timing renewal benchmark is specially:
If no touch, often through predetermined time interval, the original value of present sample is replaced present reference value to upgrade benchmark.
4. the datum renewal method of touch-screen according to claim 1, it is characterized in that, described initial characteristic values is the original value of ratio value between the original value of difference value between the original value of touch-screen neighbouring sample point sampling, touch-screen neighbouring sample point sampling or each sampled point sampling of touch-screen.
5. the datum renewal method of touch-screen according to claim 4, it is characterized in that, during ratio value between the original value that described initial characteristic values is touch-screen neighbouring sample point sampling, described ratio value be amplification one set the neighbouring sample point sampling of multiple original value between ratio.
6. the datum renewal method of the touch-screen according to any one of Claims 1 to 5, is characterized in that, described backup eigenwert is stored in nonvolatile memory.
7. a datum renewal system for touch-screen, is characterized in that, comprising:
Sampling unit, for sampling to each sampled point, obtains the original value of sampling;
Computing unit, raw calculation for sampling according to steady state (SS) obtains the initial characteristic values of each sampled point of touch-screen, the raw calculation of each time point sampling obtains the current characteristic value of touch-screen each sampled point when powering on according to touch-screen and after powering on, and current characteristic value and backup eigenwert are done and differed from and take absolute value, find out the maximal value in described absolute value, obtain the first maximal value;
Backup units, for backing up eigenwert during steady state (SS), obtains backing up eigenwert;
Reference value sets up unit, during for touch-screen is powered on sampling original value as reference value to set up benchmark;
Judging unit, whether the maximal value calculated for the sampling judged when powering on according to touch-screen is greater than the first threshold of setting, if described maximal value is greater than the first threshold of setting, then judges that current base is incorrect, and judge when current base is incorrect whether touch-screen has touch;
Reference value updating block, for incorrect and on touch-screen during no touch at current base, timing upgrades benchmark, and, touch-screen incorrect at current base has touch and the original value of present sample meets datum renewal condition time upgrade benchmark;
Monitoring unit, for incorrect and when touch-screen having touch at current base, the change of the original value of monitoring present sample in real time;
Described computing unit also differs from for reference characteristic value being done with backup eigenwert and takes absolute value, and finds out the maximal value in described absolute value, obtains the second maximal value;
Described judging unit is also for when the first maximal value is less than the second maximal value, judge whether the absolute value of the difference of described first maximal value and the second maximal value is greater than the 3rd threshold value of setting, if the absolute value of described difference is greater than the 3rd threshold value of setting, then the original value of present sample is replaced present reference value to upgrade benchmark, and judge that current touch is as wrong report point, does not perform touch operation.
8. the datum renewal system of touch-screen according to claim 7, is characterized in that, the original value of described computing unit also for deducting present sample with present reference value obtains difference, and described difference is for judging whether touch-screen has touch;
By the Second Threshold judging described difference and whether be less than setting, described judging unit judges whether touch-screen has touch, if described difference is less than the Second Threshold of setting, be then judged to be no touch, otherwise, be judged to be touch.
9. the datum renewal system of touch-screen according to claim 7, it is characterized in that, described initial characteristic values is the original value of ratio value between the original value of difference value between the original value of touch-screen neighbouring sample point sampling, touch-screen neighbouring sample point sampling or each sampled point sampling of touch-screen.
10. the datum renewal system of touch-screen according to claim 9, it is characterized in that, during ratio value between the original value that described initial characteristic values is touch-screen neighbouring sample point sampling, described ratio value be amplification one set the neighbouring sample point sampling of multiple original value between ratio.
The datum renewal system of 11. touch-screens according to any one of claim 7 ~ 10, it is characterized in that, described backup eigenwert back-up storage is in nonvolatile memory.
12. 1 kinds of touch control terminals, is characterized in that, described touch control terminal comprises the datum renewal system of the touch-screen described in any one of claim 7 ~ 11.
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| PCT/CN2013/085830 WO2014086211A1 (en) | 2012-12-07 | 2013-10-23 | Method, system, and touch terminal for updating standard of touch screen |
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