CN101996014B - Pressure detection method of touch sensing element and electronic device using same - Google Patents
Pressure detection method of touch sensing element and electronic device using same Download PDFInfo
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- CN101996014B CN101996014B CN 200910167219 CN200910167219A CN101996014B CN 101996014 B CN101996014 B CN 101996014B CN 200910167219 CN200910167219 CN 200910167219 CN 200910167219 A CN200910167219 A CN 200910167219A CN 101996014 B CN101996014 B CN 101996014B
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Abstract
The invention provides a pressure detection method of a touch sensing element, which comprises the following steps: providing a first potential difference to two electrodes of a first film; charging a capacitor by partial voltage of the first potential difference; sampling the charging voltage of the capacitor so as to obtain a plurality of first voltage values, and obtaining change of the first voltage values according to a plurality of the first voltage values; comparing the change of the first voltage values with a threshold value; and when the change of the first voltage values is less than the threshold value, post-processing at least one of the first voltage values. The invention further provides an electronic device using the pressure detection method. The pressure detection method and the electronic device provided by the invention can judge whether a touch-pressure action is effective touch pressure by detecting change of the charging voltage of the capacitor, and can realize higher position accuracy without directly calculating a resistance value.
Description
Technical field
The present invention relates to a kind of locating device, and relate in particular to a kind of pressure detection method of electric resistance touch-control sensing element and the electronic installation that uses this method.
Background technology
Fig. 1 has shown a kind of existing four-wire type Touch Screen (4-wire touch screen) 9, transparent X resistance board 91 of elasticity and the Y resistance board 92 of certain interval (gap) are constituted separately by two for they, wherein X resistance board 91 and Y resistance board 92 are planar resistor, and do not contact mutually under state of nature.On the X resistance board 91, resistance value only changes with the position of directions X; X resistance board 91 comprises the two electrode X that arrange along the left and right sides of X resistance board 91
+, X
-And the transparent resistance layer that is formed at the upper surface of X resistance board 91.On the Y resistance board 92, resistance value only changes with the position of Y-direction; Y resistance board 92 comprises the two electrode Y that arrange along the both sides, front and back of Y resistance board 92
+, Y
-And the transparent resistance layer that is formed at the lower surface of Y resistance board 92, wherein said directions X and Y-direction are mutually perpendicular two directions.
Cut-open view when Fig. 2 is pressed for described Touch Screen 9.When the touch point P on the X resistance board 91 was subjected to external force F and presses, at this touch point P place, the spacing between X resistance board 91 and the Y resistance board 92 was dwindled and is made contact resistance R
TouchBecome finite value from approximates infinity; External force F is bigger, contact resistance R
TouchResistance value littler.In the described Touch Screen 9, by calculating contact resistance R
TouchResistance value, can judge the pressure that presses of external force F.
Please refer to shown in Fig. 3 a to Fig. 3 c, it shows a kind of existing calculating contact resistance R
TouchThe method of resistance value.Contact resistance R
TouchCan obtain according to formula (1):
R
touch＝(R
X_plate)×[(X/2
n)×(Z
2/Z
1)-1](1)
In the formula (1), R
X_plateSurface resistance for X resistance board 91; N is the resolution of the analog digital converting unit (ADC) that is connected to detecting voltage point; X represents the directions X position of touch point P, and it can be tried to achieve according to the digital voltage of ADC output among Fig. 3 a; Z
1Expression Y
-The input of electrode, it can be tried to achieve according to the digital voltage of ADC output among Fig. 3 b; Z
2Expression X
+The input of electrode, it can be tried to achieve according to the digital voltage of ADC output among Fig. 3 c.
Yet this kind is by calculating contact resistance R
TouchThe pressure detection method of resistance value have following point at least:
Contact resistance R
TouchResistance value try to achieve as calculated, and the X value in the formula (1) itself is a uncertain factor.
Contact resistance R
TouchResistance value and be not equal to force value, can only as with reference to the value and can't be as the foundation of effective judgement.
Contact resistance R
TouchThe resistance value scope very big, be difficult for according to the resistance value definition critical point that calculates, thereby can limit the judgement degree of accuracy.
In view of this, be necessary to propose a kind of pressure detection method of touch-control sensing element of pinpoint accuracy, to reduce the erroneous judgement probability of touch point.
Summary of the invention
The invention provides a kind of pressure detection method of touch-control sensing element and the electronic installation that uses this method, wherein said method for detecting is by a plurality of magnitudes of voltage of sampling capacitor, and judge whether this magnitude of voltage reaches stable state, use and judge and to press whether for effectively pressing.
The invention provides a kind of pressure detection method of touch-control sensing element and the electronic installation that uses this method, wherein said method for detecting is compared with threshold value by the variation (variation) of the magnitude of voltage of the electric capacity of will take a sample, and uses and judges whether described magnitude of voltage has reached stable state.
The invention provides a kind of pressure detection method of touch-control sensing element, described touch-control sensing element comprises the first film and second film, and each film comprises two electrodes.Described method for detecting comprises the following steps: to provide two electrodes of first potential difference (PD) to described the first film; Utilize the dividing potential drop of described first potential difference (PD) that electric capacity is charged; The take a sample charging voltage of described electric capacity obtaining a plurality of first magnitudes of voltage, and is tried to achieve the variation of first magnitude of voltage according to these a plurality of first magnitudes of voltage; The variation of described first magnitude of voltage is compared with threshold value; And when the variation of described first magnitude of voltage during less than described threshold value, in described a plurality of first magnitudes of voltage at least one carried out aftertreatment.
According to the pressure detection method of the invention described above, also comprise the following steps: to provide two electrodes of second potential difference (PD) to described second film; Utilize the dividing potential drop of described second potential difference (PD), to described electric capacity charging; The take a sample charging voltage of described electric capacity obtaining a plurality of second magnitudes of voltage, and is tried to achieve the variation of second magnitude of voltage according to these a plurality of second magnitudes of voltage; The variation of described second magnitude of voltage is compared with described threshold value; When one in the variation of the variation of described first magnitude of voltage and second magnitude of voltage during greater than described threshold value, ignore described a plurality of first magnitude of voltage and second magnitude of voltage; And when the variation of the variation of described first magnitude of voltage and second magnitude of voltage during all less than described threshold value, at least one and described a plurality of second magnitudes of voltage in described a plurality of first magnitudes of voltage at least one carried out aftertreatment.
The present invention also provides a kind of electronic installation, and this device comprises the first film, second film, power supply, electric capacity and processing unit.Described the first film and second film have two electrodes respectively.Described power supply is for two electrodes that provide potential difference (PD) to described the first film or two electrodes of described second film.Described electric capacity is used for one in two electrodes of one or described second film of two electrodes that selectivity is coupled to described the first film, and charges by the dividing potential drop that the electrode that this quilt couples receives described potential difference (PD).Described processing unit is used for the charging voltage of the described electric capacity of sampling, obtaining a plurality of magnitudes of voltage, and tries to achieve the variation of magnitude of voltage according to these a plurality of magnitudes of voltage, and is used for the variation of this magnitude of voltage is compared with threshold value; Wherein when the variation of described magnitude of voltage during less than described threshold value, described processing unit carries out aftertreatment in described a plurality of magnitudes of voltage at least one.
The present invention also provides a kind of pressure detection method of touch-control sensing element, and described touch-control sensing element comprises the first film and second film, and each film comprises two electrodes.Described method for detecting comprises the following steps: to provide two electrodes of first potential difference (PD) to described the first film; Utilize the dividing potential drop of described first potential difference (PD), electric capacity is charged; The take a sample charging voltage of described electric capacity is to obtain a plurality of first magnitudes of voltage; Judge whether in described a plurality of first magnitude of voltage at least one reaches stable state; When described a plurality of first magnitudes of voltage all do not reach stable state, finish the pressure detection program; When at least one of described first magnitude of voltage reached stable state, described method also comprised the following steps: to provide two electrodes of second potential difference (PD) to described second film; Utilize the dividing potential drop of described second potential difference (PD), to described electric capacity charging; The take a sample charging voltage of described electric capacity is to obtain a plurality of second magnitudes of voltage; Judge whether in described a plurality of second magnitude of voltage at least one reaches stable state; When described a plurality of second magnitudes of voltage all do not reach stable state, finish the pressure detection program; And when at least one of described second magnitude of voltage reached stable state, then described at least one first magnitude of voltage and at least one second magnitude of voltage are carried out aftertreatment.
Among the present invention, when the touch-control sensing element is subjected to external force and presses, apply potential difference (PD) in very first time interval to two electrodes of X film (Y film), so that the charging of electrode pair electric capacity of Y film (or X film), and at second time interval charging voltage value of this electric capacity is taken a sample.When one of them film does not reach stable state to the charging voltage value of described electric capacity, then judge this time to press to invalid to press.In addition, the number of the length of described second time interval and the charging voltage value of taking a sample can be set according to the required detecting degree of accuracy of touch-control sensing element.
Among the present invention, the step that described first and second magnitudes of voltage are carried out aftertreatment comprises according to described at least one first magnitude of voltage and at least one second magnitude of voltage calculating location coordinate, and execution is corresponding to the function of this position coordinates.
Description of drawings
Fig. 1 is the synoptic diagram of two resistance boards of existing resistance touch screen;
Fig. 2 is the cut-open view of the Touch Screen of Fig. 1 when being pressed;
Fig. 3 a to Fig. 3 c is existing equivalent circuit diagram for the Touch Screen that calculates contact resistance;
Fig. 4 a is the synoptic diagram of the electronic installation of an embodiment of the present invention;
Fig. 4 b is the synoptic diagram of the electronic installation of the another kind of embodiment of the present invention;
Fig. 4 c is the equivalent circuit diagram of the electronic installation of Fig. 4 a;
Fig. 5 a is the synoptic diagram of pressure detection method of the touch-control sensing element of the embodiment of the invention;
Fig. 5 b is the synoptic diagram of pressure detection method of the touch-control sensing element of another embodiment of the present invention;
Fig. 6 is the process flow diagram of pressure detection method of the touch-control sensing element of an embodiment of the present invention;
Fig. 7 is the process flow diagram of pressure detection method of the touch-control sensing element of the another kind of embodiment of the present invention; And
Fig. 8 is the process flow diagram of pressure detection method of the touch-control sensing element of the another kind of embodiment of the present invention.
The main element symbol description
10 electronic installation 11X films
111, the electrode 12Y film of 112X film
121, electrode 13 power supplys of 122Y film
The cold end of hot end 132 power supplys of 131 power supplys
The input end of 14 detecting unit 14a detecting units
141 electric capacity, 142 analog digital converting unit
143 processing units, 171～171 " on-off elements
172～172 " on-off element 173 on-off elements
R
TOUCHContact resistance T
1Very first time interval
T
2, T
2', T
2" the second time interval V, V
1, V
2Magnitude of voltage
S
111～S
140Step S
210～S
280Step
S
310～S
380Step R
TouchContact resistance
9 Touch Screen 91X resistance boards
92Y resistance board X
+, X
-The electrode of X resistance board
Y
+, Y
-The electrode P touch point of Y resistance board
ADC analog digital converting unit T
1' the first Preset Time
T
1" second Preset Time
Embodiment
In order to allow above-mentioned and other purposes of the present invention, feature and the advantage can be more obvious, hereinafter will cooperate appended diagram, be described in detail below.
Please refer to shown in Fig. 4 a, it is the synoptic diagram of the electronic installation 10 of the embodiment of the invention.Be understandable that, only show among Fig. 4 a to be used for the explanation partial component of wanting required for the present invention, and omitted other members.The embodiment of described electronic installation 10 includes, but not limited to PDA(Personal Digital Assistant), handwriting device, notebook computer and mobile communications device etc.Described electronic installation 10 comprises X film 11, Y film 12, power supply 13, detecting unit 14 and a plurality of on-off element 171～173, and wherein this on-off element 171～173 for example can be, but is not limited to semiconductor switch.
In this embodiment, X film 11 has been formed a kind of electric resistance touch-control sensing element with Y film 12, and this touch-control sensing element includes, but is not limited to Touch Screen (touch screen) or Trackpad (touchpad).X film 11 comprises the two electrode X that are formed at respectively on this X film 11 along the two opposite sides of directions X
+, X
-And the transparent resistance layer (not indicating) that is formed at the upper surface of this X film 11.Y film 12 comprises the two electrode Y that are formed at respectively on this Y film 12 along the two opposite sides of Y-direction
+, Y
-And the transparent resistance layer (not indicating) that is formed at the lower surface of this Y film 12.Power supply 13 has hot end 131 and cold end 132, and wherein hot end 131 optionally is coupled to the electrode X of X film 11 by on-off element 171
+Or the electrode Y of Y film 12
+ Cold end 132 optionally is coupled to the electrode X of X film 11 by on-off element 172
-Or the electrode Y of Y film 12
-In other embodiments, X film 11 also can be positioned at the top of Y film 12; At this moment, the transparent resistance layer is formed at the below of X film 11 and the transparent resistance layer is formed at the top of Y film 12.
Described detecting unit 14 be used for detecting X film 11 and 12 outputs of Y film magnitude of voltage V, judge according to the variation of this magnitude of voltage V whether be effectively press and calculate position coordinates that touch point P be positioned at X film 11 and Y film 12, wherein said magnitude of voltage V is the dividing potential drop of the current potential of power supply 13 if pressing action.The input end 14a of described detecting unit 14 is coupled to the electrode X of X film 11 by on-off element 173
+Or the electrode Y of Y film 12
+, be used for detecting electrode X
+Or electrode Y
+Magnitude of voltage V.In other embodiments, the input end 14a of described detecting unit 14 also can be coupled to the electrode X of X film 11 by on-off element 173
-Or the electrode Y of Y film 12
-, be used for detecting electrode X
-Or electrode Y
-Magnitude of voltage V.Be understandable that the line connection that Fig. 4 a discloses not is for restriction the present invention only for exemplary, described X film 11 and Y film 12 are not limited to the content that Fig. 4 a discloses with the connected mode of power supply 13 and detecting unit 14.
Please refer to shown in Fig. 4 b, for example in one embodiment, first power supply 13 ' be used for supplying power to X film 11, wherein first power supply 13 ' hot end can be by on-off element 171 ' the be coupled to electrode X of X film 11
+First power supply 13 ' cold end can be by on-off element 172 ' the be coupled to electrode X of X film 11
-" be used for supplying power to Y film 12, wherein second source 13 " hot end can by on-off element 171 " is coupled to the electrode Y of Y film 12 to second source 13
+ Second source 13 " cold end can by on-off element 172 " is coupled to the electrode Y of Y film 12
-Detecting unit 14 can be coupled to the electrode X of X film 11 by on-off element 173
+(or X
-) or the electrode Y of Y film 12
+(or Y
-), be used for the magnitude of voltage V that detecting X film 11 or Y film 12 are exported.Described on-off element 171 among Fig. 4 b ', for example can be semiconductor switch 171 ", 172 ', 172 " and 173.
Described detecting unit 14 comprises electric capacity 141, analog digital converting unit (ADC) 142 and processing unit 143.One end of electric capacity 141 is coupled to the input end 14a of detecting unit 14, and its other end is coupled to reference potential; Dividing potential drop on X film 11 or the Y film 12 will be charged to electric capacity 141.The input end of analog digital converting unit 142 is coupled to first end of electric capacity 141, is used for the charging voltage value V of electric capacity 141 first ends is converted to digital voltage value.Processing unit 143 is coupled to analog digital converting unit 142, for the digital voltage value of exporting according to analog digital converting unit 142, judges whether to press action for effectively pressing.Judge when processing unit 143 and to press action when effectively pressing, 143 pairs of digital voltage values of processing unit carry out aftertreatment (post-processing) program, for example comprise that calculating touch point P is positioned at the position coordinates of X film 11 or/and be positioned at the position coordinates of Y film 12, and carry out function corresponding to described position coordinates, judge that wherein whether press action is after the method that effectively presses will be specified in.
Please be simultaneously with reference to shown in Fig. 4 a and Fig. 4 c, wherein Fig. 4 c is the equivalent circuit diagram of the electronic installation 10 of Fig. 4 a.When object 8, for example pen or finger when pressing the touch point P on the Y film 12, can produce contact resistance R between X film 11 and the Y film 12
TOUCH, shown in Fig. 4 c.
In the time will detecting the directions X position coordinates of touch point P, the hot end 131 of power supply 13 is coupled to the electrode Y of Y film 12 by on-off element 171
+, the cold end 132 of power supply 13 is coupled to the electrode Y of Y film 12 by on-off element 172
-, detecting unit 14 is coupled to the electrode X of X film 11 by on-off element 173
+(or X
-).At this moment, power supply 13 is at electrode X
+(or X
-) the partial pressure value V and the charging current I that go up to produce will charge to electric capacity 141, wherein the pressure that presses of object 8 more greatly, contact resistance R
TOUCHLittler, and described charging current I is bigger, electric capacity 141 will be in more being charged to the predeterminated voltage value in the short time, for example with electrode X
+(or X
-) identical magnitude of voltage (being partial pressure value V).142 charging voltage values at electric capacity 141 of analog digital converting unit are taken a sample, and are converted into digital voltage value.143 of processing units are according to described digital voltage value, whether the charging voltage value of judging electric capacity 141 reaches stable state behind one section Preset Time of charging, wherein when processing unit 143 judges that the charging voltage of this electric capacity 141 does not reach stable state as yet, then ignore the magnitude of voltage of taking a sample; When processing unit 143 judges that the charging voltage of electric capacity 141 has reached stable state, then the magnitude of voltage of taking a sample is carried out aftertreatment.
In like manner, in the time will detecting the Y-direction position coordinates of touch point P, the hot end 131 of power supply 13 is coupled to the electrode X of X film 11 by on-off element 171
+, the cold end 132 of power supply 13 is coupled to the electrode X of X film 11 by on-off element 172
-, detecting unit 14 is coupled to the electrode Y of Y film 11 by on-off element 173
+(or Y
-).At this moment, power supply 13 is at electrode Y
+(or Y
-) the partial pressure value V and the charging current I that go up to produce will charge to electric capacity 141.Analog digital converting unit 142 is taken a sample at the charging voltage value of electric capacity 141, and be converted into digital voltage value equally.143 of processing units judge according to digital voltage value whether the charging voltage of electric capacity 141 reaches stable state behind one section Preset Time of charging.
Illustrate that then processing unit 143 judges whether the charging voltage of electric capacity 141 reaches the mode of stable state.Please be simultaneously with reference to shown in Fig. 4 a, Fig. 4 c and Fig. 5 a, interval T of the very first time
1During beginning, power supply 13 is coupled to electrode Y by on-off element 171,172
+And Y
-(or X
+And X
-), and detecting unit 14 is coupled to electrode X by on-off element 173
+Or X
-(Y
+Or Y
-).At interval T of the very first time
1In, electrode X
+Or X
-(Y
+Or Y
-) on partial pressure value V will charge to reach predeterminated voltage to electric capacity 141; At the second time interval T
2, analog digital converting unit 142 begins the charging voltage value of electric capacity 141 is taken a sample, and a plurality of magnitudes of voltage of taking a sample are converted to digital voltage value.Processing unit 143 judges according to digital voltage value whether the charging voltage value of electric capacity 141 reaches stable state.
For example shown in Fig. 5 a, when object 8 presses Y film 12 with less power, between X film 11 and Y film, can form bigger contact resistance R
TOUCHWhen power supply 13 is coupled to electrode Y
+And Y
-(or X
+And X
-) and detecting unit 17 be coupled to electrode X
+Or X
-(Y
+Or Y
-) time, electric capacity 141 is at interval T of the very first time
1Interior charging voltage value is for example with V
1Curvilinear motion; At the second time interval T
2In, analog digital converting unit 142 begins charging voltage value V
1Latter end take a sample and obtain a plurality of digital voltage values; 143 variations of calculating the magnitude of voltage of taking a sample of processing unit, and judge whether this magnitude of voltage reaches stable state, for example processing unit 143 calculates the rate of change of difference of average and a plurality of two adjacent samples magnitudes of voltage of difference of poor, a plurality of two adjacent samples magnitudes of voltage of poor, two sampling voltage value of two adjacent samples magnitudes of voltage, and result of calculation and preset threshold value are compared.When the variation of the magnitude of voltage of taking a sample during greater than described threshold value, then expression does not reach stable state as yet; Otherwise when the variation of the magnitude of voltage of taking a sample during less than described threshold value, then expression has reached stable state.For example in one embodiment, the processing unit 143 samplings second time interval T
2Magnitude of voltage V when initial
11And the magnitude of voltage V when finishing
1n, and calculate its difference (V
1n-V
11); Then, processing unit 143 is with this difference (V
1n-V
11) compare with threshold value, with the variable condition of the charging voltage value of judging electric capacity 141.
In like manner, when object 8 presses Y film 12 with bigger power, between X film 11 and Y film 12, can form less contact resistance R
TOUCH, when power supply 13 is coupled to electrode Y
+And Y
-(or X
+And X
-) and detecting unit 17 be coupled to electrode X
+Or X
-(Y
+Or Y
-) time, electric capacity 141 is at interval T of the very first time
1Interior charging voltage value is for example with V
2Curvilinear motion.At the second time interval T
2In, analog digital converting unit 142 will be to charging voltage value V
2Take a sample and obtain a plurality of digital voltage values; 143 of processing units judge whether the magnitude of voltage of taking a sample reaches stable state.Be understandable that the sampling number of the charging voltage value of the 142 pairs of electric capacity 141 in digital simulation unit can determine that sampling number the more then can obtain detecting more accurately the result according to different application.The described second time interval T
2Time length can determine the second time interval T according to practical application
2Longer, then can obtain detecting more accurately the result.In other embodiments, the voltage curve V of Fig. 5 a
1, V
2Can be used for also representing that electric capacity 141 is respectively coupled to the electrode X of X film
+Or X
-And the electrode Y of Y film
+Or Y
-The time charging voltage.
Please refer to shown in Figure 6ly, it is the process flow diagram according to the pressure detection method of the touch-control sensing element of an embodiment of the present invention.Described method for detecting comprises the following steps: to provide two electrode (the step Ss of first potential difference (PD) to the first film
111); Utilize the dividing potential drop of first potential difference (PD), electric capacity is charged, and the charging voltage of this electric capacity of taking a sample, obtaining a plurality of first magnitudes of voltage, and try to achieve variation (the step S of first magnitude of voltage according to these a plurality of first magnitudes of voltage
112); Two electrode (step S of second potential difference (PD) to the second film are provided
121); Utilize the dividing potential drop of described second potential difference (PD), described electric capacity is charged, and the charging voltage of this electric capacity of taking a sample, obtaining a plurality of second magnitudes of voltage, and try to achieve variation (the step S of second magnitude of voltage according to these a plurality of second magnitudes of voltage
122); With the variation of the variation of described first magnitude of voltage and second magnitude of voltage (the step S that compares with threshold value
113, S
123); When one in the variation of the variation of described first magnitude of voltage and second magnitude of voltage during greater than described threshold value, judge invalid (the step S of this sub-sampling
130); And when the variation of the variation of described first magnitude of voltage and second magnitude of voltage during all less than described threshold value, at least one and a plurality of second magnitudes of voltage in described a plurality of first magnitudes of voltage at least one carried out aftertreatment (step S
140).In this embodiment, step S
111, S
121First potential difference (PD) in the step and second potential difference (PD) can be identical or idiostatic neither, and S
113, S
123In threshold value can be an identical or same threshold value neither.
Please be simultaneously with reference to Fig. 4 a to Fig. 6, at interval T of the very first time
1During beginning, power supply 13 is coupled to two electrode Y of Y film (or X film) by on-off element 171,172
+And Y
-(or X
+And X
-) and detecting unit 14 be coupled to two electrode X of X film (or Y film) by on-off element 173
+And X
-(or Y
+And Y
-) in one.In this embodiment, the voltage curve V of Fig. 5 a
1, V
2Charging voltage when expression electric capacity 141 is respectively coupled to X film (or Y film) and Y film (or X film); In addition, power supply 13 can provide potential difference (PD) respectively to one section different time of two electrodes of Y film or X film, detecting unit 14 just begin the to take a sample charging voltage of described electric capacity.For example shown in Fig. 5 b, power supply 13 provides two electrodes first preset time T of potential difference (PD) to Y film (or X film)
1' after, detecting unit 14 is at the second time interval T
2The charging voltage of the described electric capacity of ' middle sampling; Power supply 13 provides two electrodes second preset time T of potential difference (PD) to X film (or Y film)
1" after, detecting unit 14 is at the second time interval T
2" the charging voltage of the described electric capacity of middle sampling.Wherein, described first preset time T
1' and second preset time T
1" be intended to determine the sampling zero-time, sampling zero-time difference can obtain different sampling efficiencies; Described first preset time T
1' and second preset time T
1" can be according to size, the electrode X of electric capacity
+Or X
-(Y
+Or Y
-) on partial pressure value V and charge efficiency and deciding, for example charge efficiency is higher, then first preset time T
1' and second preset time T
1" can be shorter.
Electrode (the X that couples with detecting unit 14
+Or X
-) on voltage at interval T of the very first time
1Interior to electric capacity 141 charging (step S
111), analog digital converting unit 142 is at the second time interval T
2The charging voltage of sampling capacitor 141, and obtain a plurality of first magnitude of voltage (V shown in Fig. 5 a
11To V
1nOr V
21To V
2n), and try to achieve the variation of first magnitude of voltage, for example charging voltage value V according to these a plurality of first magnitudes of voltage
1Variation (step S
112), wherein the variation of first magnitude of voltage can be stored in the processing unit 143.
Then, power supply 13 is coupled to two electrode X of X film (Y film) by on-off element 171,172
+And X
-(Y
+And Y
-), and detecting unit 14 is coupled to two electrode Y of Y film (X film) by on-off element 173
+And Y
-(X
+And X
-) in one.
Electrode (the Y that couples with detecting unit 14
+Or Y
-) on voltage at interval T of the very first time
1Interior to electric capacity 141 charging (step S
121), analog digital converting unit 142 is at the second time interval T
2The charging voltage of sampling capacitor 141, and obtain a plurality of second magnitude of voltage (V shown in Fig. 5 a
21To V
2nOr V
11To V
1n), and try to achieve the variation of second magnitude of voltage, for example charging voltage value V according to these a plurality of second magnitudes of voltage
2Variation (step S
122).Then, processing unit 143 is compared the variation of described first magnitude of voltage and the variation of second magnitude of voltage with the preset threshold value, and wherein this threshold value can be set (step S according to electronic installation 10 required detecting degree of accuracy
113, S
123).When one in the variation of the variation of described first magnitude of voltage and second magnitude of voltage during greater than threshold value, then decision voltage value does not reach stable state, that is processing unit 143 judges that this sub-sampling is invalid, and ignore a plurality of first magnitudes of voltage and second magnitude of voltage that (ignore) takes a sample, finish this detection process (step S simultaneously
130).When the variation of the variation of described first magnitude of voltage and second magnitude of voltage during all less than threshold value, represent that then first magnitude of voltage and second magnitude of voltage have reached stable state, 143 of processing units carry out aftertreatment (step S at least one and described a plurality of second magnitudes of voltage in described a plurality of first magnitudes of voltage at least one
140), for example processing unit 143 is according to the first magnitude of voltage V
1n(or V
2n) and the second magnitude of voltage V
2n(or V
1n) calculate the position coordinates of touch point P, and carry out the function corresponding to this position coordinates.Be understandable that, do not need to limit the order of the variation of the variation of trying to achieve described first magnitude of voltage and described second magnitude of voltage.
In an embodiment of the present invention, the variation of described first magnitude of voltage for example is the rate of change etc. of difference of average and a plurality of two adjacent first magnitudes of voltage of difference of poor, a plurality of two adjacent first magnitudes of voltage of poor, two first magnitudes of voltage of two adjacent first magnitudes of voltage.Similarly, the variation of described second magnitude of voltage for example is the rate of change etc. of difference of average and a plurality of two adjacent second magnitudes of voltage of difference of poor, a plurality of two adjacent second magnitudes of voltage of poor, two second magnitudes of voltage of two adjacent second magnitudes of voltage.
Please refer to shown in Figure 7ly, it shows the process flow diagram of the pressure detection method of the touch-control sensing element of another kind of embodiment according to the present invention.Described method for detecting comprises the following steps:
Step S
210: two electrodes of first potential difference (PD) to the first film are provided.
Step S
220: utilize the dividing potential drop of first potential difference (PD), electric capacity is charged, and the charging voltage of this electric capacity of taking a sample, obtaining a plurality of first magnitudes of voltage, and try to achieve the variation of first magnitude of voltage according to these a plurality of first magnitudes of voltage.
Step S
230: two electrodes that second potential difference (PD) to the second film is provided.
Step S
240: utilize the dividing potential drop of second potential difference (PD), described electric capacity is charged, and the charging voltage of the described electric capacity of taking a sample, obtaining a plurality of second magnitudes of voltage, and try to achieve the variation of second magnitude of voltage according to these a plurality of second magnitudes of voltage.
Step S
250: the variation of described first magnitude of voltage is compared with threshold value, when the variation of described first magnitude of voltage during greater than described threshold value, then enter step S
260When the variation of described first magnitude of voltage during less than described threshold value, then enter step S
270
Step S
260: judge that this sub-sampling is invalid.
Step S
270: the variation of described second magnitude of voltage is compared with threshold value, when the variation of described second magnitude of voltage during greater than described threshold value, then enter step S
260When the variation of described second magnitude of voltage during less than described threshold value, then enter step S
280
Step S
280: at least one and described a plurality of second magnitude of voltage in described a plurality of first magnitudes of voltage at least one carried out aftertreatment, this aftertreatment can include, but is not limited to: according to described at least one first magnitude of voltage and described at least one second magnitude of voltage, the position coordinates of calculating touch point or execution are corresponding to the function of this position coordinates.
The difference of this embodiment and Fig. 6 embodiment is, the processing unit 143 of present embodiment judges earlier whether first magnitude of voltage has reached stable state (namely whether the variation of this first magnitude of voltage is less than threshold value), when first magnitude of voltage does not reach stable state, processing unit 143 will be ignored all magnitudes of voltage of taking a sample and finish this detection process (step S
260), and get back to step S
210Re-execute detection process.In addition, detailed embodiment and Fig. 6 of each step are similar, so repeat no more in this.In other embodiments, step S
250With step S
270Order interchangeable.
Please refer to shown in Figure 8ly, it is the process flow diagram of the pressure detection method of the touch-control sensing element of another kind of embodiment according to the present invention.Described method for detecting comprises the following steps:
Step S
310: two electrodes of first potential difference (PD) to the first film are provided.
Step S
320: utilize the dividing potential drop of first potential difference (PD), electric capacity is charged, and the charging voltage of this electric capacity of taking a sample, obtaining a plurality of first magnitudes of voltage, and try to achieve the variation of first magnitude of voltage according to these a plurality of first magnitudes of voltage.
Step S
330: the variation of first magnitude of voltage is compared with threshold value, when the variation of first magnitude of voltage during greater than threshold value (also when described first magnitude of voltage does not all reach stable state), then enter step S
340When the variation of first magnitude of voltage during less than threshold value (also when at least one of described first magnitude of voltage reached stable state), then enter step S
350
Step S
340: judge that this sub-sampling is invalid.
Step S
350: two electrodes that second potential difference (PD) to the second film is provided.
Step S
360: utilize the dividing potential drop of second potential difference (PD), described electric capacity is charged, and the charging voltage of this electric capacity of taking a sample, obtaining a plurality of second magnitudes of voltage, and try to achieve the variation of second magnitude of voltage according to these a plurality of second magnitudes of voltage.
Step S
370: the variation of second magnitude of voltage is compared with threshold value, when the variation of second magnitude of voltage during greater than threshold value (also when described second magnitude of voltage does not all reach stable state), then enter step S
340When the variation of second magnitude of voltage during less than threshold value (also when at least one of described second magnitude of voltage reached stable state), then enter step S
380
Step S
380: at least one and a plurality of second magnitude of voltage in described a plurality of first magnitudes of voltage at least one carried out aftertreatment, this aftertreatment can include, but is not limited to: according at least one first magnitude of voltage and at least one second magnitude of voltage, the position coordinates of calculating touch point and/or execution are corresponding to the function of this position coordinates.
The difference of this embodiment and Fig. 6 embodiment is, in the present embodiment, the electrode voltage of one in detecting unit 14 elder generation's sampling X films or the Y film, and judge whether this magnitude of voltage has reached stable state, if do not reach stable state as yet, then finish this detection process immediately and get back to step S
310Re-execute detection process.After the electrode voltage of one in judgement X film or the Y film has reached stable state, the electrode voltage of another film of just taking a sample, and then carry out stable state and judge.So, can improve the operational paradigm of detecting unit 14.In addition, detailed embodiment and Fig. 6 of each step are similar, so repeat no more in this.
In the explanation of the invention described above, directions X and Y-direction are two orthogonal directions, for example the length of display screen or Trackpad and wide direction.
As previously mentioned, because existing Touch Screen (Touch screen) presses pressure by calculating contact resistance with judgement, have lower degree of accuracy and cause erroneous judgement easily.The present invention proposes a kind of pressure detection method of touch-control sensing element and the electronic installation that uses this method in addition, charging voltage by detecting electric capacity changes to judge and whether presses action for effectively pressing, and because direct calculated resistance value not has higher position precision.
Though the present invention is disclosed by above-described embodiment, yet above-described embodiment is not that any the technical staff in the technical field of the invention without departing from the spirit and scope of the present invention, should make various variations and modification for restriction the present invention.Therefore protection scope of the present invention should be as the criterion with the scope that appended claims was defined.
Claims (9)
1. the pressure detection method of a touch-control sensing element, described touch-control sensing element comprises the first film and second film, each film comprises two electrodes, two electrodes of wherein said the first film are formed at the two opposite sides of described the first film upper edge first direction respectively, two electrodes of described second film are formed at the two opposite sides of the described second film upper edge second direction respectively, described first direction is vertical mutually with described second direction, and described method for detecting comprises the following steps:
Two electrodes of first potential difference (PD) to described the first film are provided;
Utilize the dividing potential drop of described first potential difference (PD), electric capacity is charged;
The take a sample charging voltage of described electric capacity obtaining a plurality of first magnitudes of voltage, and is tried to achieve the variation of first magnitude of voltage according to these a plurality of first magnitudes of voltage;
The variation of described first magnitude of voltage is compared with first threshold value;
Two electrodes of second potential difference (PD) to described second film are provided;
Utilize the dividing potential drop of described second potential difference (PD), described electric capacity is charged;
The take a sample charging voltage of described electric capacity obtaining a plurality of second magnitudes of voltage, and is tried to achieve the variation of second magnitude of voltage according to described a plurality of second magnitudes of voltage;
The variation of described second magnitude of voltage is compared with second threshold value, and wherein said first threshold value and described second threshold value are an identical or same threshold value neither;
When the variation of described first magnitude of voltage during greater than described first threshold value or when the variation of described second magnitude of voltage during greater than described second threshold value, ignore described a plurality of first magnitude of voltage and second magnitude of voltage; And
When the variation of described first magnitude of voltage less than described first threshold value and when the variation of described second magnitude of voltage during less than described second threshold value, according to described at least one first magnitude of voltage and described at least one second magnitude of voltage calculating location coordinate and carry out function corresponding to described position coordinates.
2. method for detecting according to claim 1, wherein, the variation of described first magnitude of voltage refers to one in the rate of change of difference of average and a plurality of two adjacent first magnitudes of voltage of difference of poor, a plurality of two adjacent first magnitudes of voltage of poor, two first magnitudes of voltage of two adjacent first magnitudes of voltage; And the variation of described second magnitude of voltage refers to one in the rate of change of difference of average and a plurality of two adjacent second magnitudes of voltage of difference of poor, a plurality of two adjacent second magnitudes of voltage of poor, two second magnitudes of voltage of two adjacent second magnitudes of voltage.
3. method for detecting according to claim 1 wherein, provides described first potential difference (PD) to two electrodes of described the first film and through behind first Preset Time, and the charging voltage of the described electric capacity that begins to take a sample is to obtain described a plurality of first magnitude of voltage; And providing described second potential difference (PD) to two electrodes of described second film and through behind second Preset Time, the charging voltage of the described electric capacity that begins to take a sample is to obtain described a plurality of second magnitude of voltage.
4. electronic installation, this electronic installation comprises:
The first film, this first film has two electrodes, and two electrodes of wherein said the first film are formed at the two opposite sides of described the first film upper edge first direction respectively;
Second film, this second film has two electrodes, and two electrodes of wherein said second film are formed at the two opposite sides of the described second film upper edge second direction respectively, and described first direction is vertical mutually with described second direction;
Power supply, this power supply are used for providing first potential difference (PD) to two electrodes of described the first film or two electrodes of second potential difference (PD) to described second film are provided;
Electric capacity, this electric capacity are used for one in two electrodes of one or described second film of two electrodes that selectivity is coupled to described the first film, and receive the dividing potential drop of described first potential difference (PD) or second potential difference (PD) by the electrode that this couples, to charge; And
Processing unit, this processing unit is used for the charging voltage of the described electric capacity of sampling, to obtain a plurality of first magnitudes of voltage and a plurality of second magnitude of voltage, and try to achieve the variation of first magnitude of voltage and try to achieve the variation of second magnitude of voltage according to this a plurality of second magnitudes of voltage according to these a plurality of first magnitudes of voltage, and for the variation of this first magnitude of voltage is compared with first threshold value and the variation of this second magnitude of voltage is compared with second threshold value;
Wherein, when the variation of described first magnitude of voltage during less than described first threshold value and when the variation of described second magnitude of voltage during less than described second threshold value, described processing unit is according to described at least one first magnitude of voltage and described at least one second magnitude of voltage calculating location coordinate and carry out function corresponding to described position coordinates.
5. electronic installation according to claim 4, wherein, when the variation of described first magnitude of voltage greater than the variation of described first threshold value or described second magnitude of voltage during greater than described second threshold value, described processing unit is ignored described a plurality of first magnitude of voltage and second magnitude of voltage.
6. electronic installation according to claim 4, wherein, described power supply optionally is coupled to two electrodes of described the first film or two electrodes of described second film by on-off element, and described electric capacity optionally is coupled to one in two electrodes of one or described second film in two electrodes of described the first film by on-off element.
7. electronic installation according to claim 6, wherein, when described power supply was coupled to two electrodes of described the first film, described electric capacity was coupled to one in two electrodes of described second film; When described power supply was coupled to two electrodes of described second film, described electric capacity was coupled to one in two electrodes of described the first film.
8. electronic installation according to claim 4, this device also comprises:
Analog digital converting unit, this analog digital converting unit is coupled to described electric capacity, and the charging voltage of this electric capacity is converted to described a plurality of first magnitude of voltage and second magnitude of voltage.
9. electronic installation according to claim 4, wherein, the variation of described first magnitude of voltage refers to one in the rate of change of difference of average and a plurality of two adjacent first magnitudes of voltage of difference of poor, a plurality of two adjacent first magnitudes of voltage of poor, two first magnitudes of voltage of two adjacent first magnitudes of voltage; And the variation of described second magnitude of voltage refers to one in the rate of change of difference of average and a plurality of two adjacent second magnitudes of voltage of difference of poor, a plurality of two adjacent second magnitudes of voltage of poor, two second magnitudes of voltage of two adjacent second magnitudes of voltage.
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| CN 200910167219 CN101996014B (en) | 2009-08-21 | 2009-08-21 | Pressure detection method of touch sensing element and electronic device using same |
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| CN 200910167219 CN101996014B (en) | 2009-08-21 | 2009-08-21 | Pressure detection method of touch sensing element and electronic device using same |
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| CN101996014B true CN101996014B (en) | 2013-08-14 |
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| CN202795309U (en) * | 2011-07-26 | 2013-03-13 | 比亚迪股份有限公司 | Touch control device and portable electronic device |
| KR20160057346A (en) * | 2013-09-17 | 2016-05-23 | 에이브이씨 테크놀로지 가부시키가이샤 | Touch panel device and method for driving touch panel |
| JP6197962B2 (en) * | 2014-10-07 | 2017-09-20 | 株式会社村田製作所 | Touch input device and touch input detection method |
| CN106598364A (en) * | 2015-10-19 | 2017-04-26 | 义隆电子股份有限公司 | Pressure detection method |
| CN107168587B (en) * | 2017-07-13 | 2019-08-27 | 京东方科技集团股份有限公司 | A kind of piezoresistive detection substrate, display panel and display device |
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| CN101271374B (en) * | 2008-05-19 | 2011-02-16 | 北京中星微电子有限公司 | Method and device for detecting touch panel |
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