CN101561733A - Method for detecting capacitive type touch-control device - Google Patents
Method for detecting capacitive type touch-control device Download PDFInfo
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- CN101561733A CN101561733A CNA2008100925172A CN200810092517A CN101561733A CN 101561733 A CN101561733 A CN 101561733A CN A2008100925172 A CNA2008100925172 A CN A2008100925172A CN 200810092517 A CN200810092517 A CN 200810092517A CN 101561733 A CN101561733 A CN 101561733A
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Abstract
The invention provides a method for detecting a capacitive type touch-control device. The capacitive type touch-control device comprises a touch-control panel which is provided with a plurality of induction lines, wherein the induction line (N) is connected with a first touch-control integrated circuit, and the induction line (N+1) is connected with a second touch-control integrated circuit. The detecting method comprises the following steps: obtaining an analog-to-digital conversion value of at least one induction line before the induction line (N) and an analog-to-digital conversion value of at least one induction line behind the induction line (N); and deciding the induction capability of the induction line (N) according to the obtained analog-to-digital conversion values. The method for detecting the capacitive type touch-control device is used for judging the induction capability of the induction line (N) in a boundary to avoid the incorrect or smaller condition of the induction capability of the induction line (N) in the boundary.
Description
Technical field
The present invention is relevant a kind of capacitive touch device, particularly about a kind of detection method of capacitive touch device.
Background technology
On tradition is used, large size capacitive touch-control screen all uses surface capacitance type (surfacecapacitive) detection technology, but the surface capacitance type detection technology is to utilize the one group of electric current difference that flows to each end points of screen to differentiate the position of finger, therefore when the finger number of touching contact panel be that two fingers are when above, repayment set of currents number still is one group, so only can distinguish one group of absolute coordinates position, for example when two-dimensional matrix, only can repay one group of X, Y parameter, thereby can't reach the function that refers to touch-control more.
(A11 Points Addressable can be located in all contacts; APA) though type array capacitor formula detection technology can reach the function that refers to touch-control more, but it need put the action that sensor (Point Sensor) discharges and recharges to each, contact panel with matrix shape, when the line of induction (trace) of X-axis and Y-axis increases, the number of pixels of APA type array capacitor formula will sharply increase, thereby cause capture speed (frame rate) to descend, so be not suitable for the application of large touch panel.
Another kind of shaft staggered (Axis Intersect; AI) type array capacitor formula detection technology can reach the function that refers to touch-control too.Fig. 1 shows that tradition is applied in the AI type array capacitor formula detection technology of small size contact panel, it comprises a small size contact panel 10 and AI type array capacitor formula touch-control IC12 scanning contact panel 10, the AI type array capacitor formula touch-control IC12 that can support to scan 22 lines of induction with a maximum is an example, though capture speed is well when the small size contact panel 10 of 10 line of induction TRX1～TRX10 and TRY1～TRY10 is respectively arranged to be applied in X-axis and Y-axis, but if AI type array capacitor formula touch-control IC12 will be applied to X-axis and Y-axis the large touch panel 14 of 40 line of induction TRX1～TRX40 and TRY1～TRY40 is respectively arranged the time, as shown in Figure 2, then must increase total line of induction quantity that AI type array capacitor formula touch-control IC12 can scan, yet, it is very big that touch-control IC12 accounts for the ratio of the capture speed that whole contact panel uses to the time that capacitor charge and discharge spent at every turn, that is to say that the capture speed issue is mainly determined capacitor charge and discharge by each frame of IC12 (frame), so be applied to large touch panel 14 and will have a very large shortcoming to increase the method to scan line of induction number, be exactly that capture speed on the overall applicability will seriously descend, and then influence the usefulness of application end.
Summary of the invention
Purpose of the present invention is to propose a kind of detection method of capacitive touch device.
A kind of capacitive touch device comprises that a contact panel has many lines of induction and these many lines of induction of a plurality of touch-control IC scanning, wherein the N bar line of induction in these many lines of induction connects the first touch-control integrated circuit in these a plurality of touch-control integrated circuit, and the N+1 bar line of induction in these many lines of induction connects the second touch-control integrated circuit in these a plurality of touch-control integrated circuit.According to the present invention, a kind of detection method of this capacitive touch device is in order to judge the induction amount at this N bar line of induction of boundary.
In one embodiment, this detection method comprises the induction amount that obtains this N bar line of induction with the analog digital conversion value of several the lines of induction before and after this N bar line of induction.
In another embodiment, this detection method is earlier this N bar line of induction to be discharged and recharged to obtain one first analog digital conversion value, obtain the induction amount of one second analog digital conversion value by this first analog digital conversion value again, wherein this second analog digital conversion value function that is this first analog digital conversion value as this N bar line of induction.
In another embodiment, this detection method comprises that each this touch-control integrated circuit only uses at every turn that line of induction is capable to discharge and recharge obtaining an analog digital conversion value, and utilizes this analog digital conversion value to determine the induction amount of the employed line of induction.
The detection method of this capacitive touch device is in order to judging the induction amount at the line of induction of boundary, with the induction amount of the line of induction of avoiding boundary situation incorrect or less than normal is arranged.
Description of drawings
Fig. 1 shows that tradition is applied in the AI type array capacitor formula detection technology of small size contact panel;
Fig. 2 shows that tradition is applied in the AI type array capacitor formula detection technology of large touch panel;
Fig. 3 shows a kind of capacitive touch device that uses two above AI type array capacitor formula touch-control IC scanning contact panels;
The partial enlarged drawing of Fig. 4 displayed map 3;
Fig. 5 shows first embodiment that solves boundary problem;
Fig. 6 shows second embodiment that solves boundary problem; And
Fig. 7 shows the 3rd embodiment that solves boundary problem.
Drawing reference numeral:
10 contact panels
12 touch-control IC
14 contact panels
20 capacitive touch devices
22 contact panels
24 touch-control IC
26 touch-control IC
Embodiment
Fig. 3 shows a kind of capacitive touch device 20 that uses two above AI type array capacitor formula touch-control IC scanning contact panels.The partial enlarged drawing of Fig. 4 displayed map 3.In capacitive touch device 20, the line of induction TRX1 to TRX10 in the touch-control IC24 scanning contact panel 22, the line of induction TRX11 to TRX20 in the touch-control IC26 scanning contact panel 22.Because capacitive touch device 20 can use many AI type array capacitor formula touch-control IC to scan contact panel simultaneously, when therefore being applied in large size panel, not only have to refer to touch controllable function more, also have good capture speed.In the detection method of the capacitance touching control IC of small size contact panel, generally be to choose two inductive line pairs simultaneously to discharge and recharge to obtain analog digital conversion (the Analogy Digital Convert of these two lines of induction in electric capacity; ADC) value then utilizes the ADC value of these two lines of induction to obtain a preferable ADC value as one of them induction amount of these two lines of induction again.If above-mentioned detection method is applied to the same axial words of the common scanning of two capacitance touching control IC, as shown in Figure 4, simultaneously line of induction TRX7 and TRX8 are discharged and recharged to obtain the ADC value of line of induction TRX7 and TRX8, with the ADC value that obtains induction amount as line of induction TRX7, the rest may be inferred, utilize the induction amount of the ADC value decision line of induction TRX8 of line of induction TRX8 and TRX9, utilize the induction amount of line of induction TRX9 and TRX10 decision line of induction TRX9.Chat according to stating of front, the induction amount of the line of induction TRX10 of large touch panel 22 should be judged by the ADC value of line of induction TRX10 and TRX11, but line of induction TRX10 connects touch-control IC24 and line of induction TRX11 connects touch-control IC26, therefore can only judge with the ADC value of line of induction TRX10 in the induction amount of the line of induction TRX10 of boundary, thereby make the induction amount of line of induction TRX10 that situation incorrect or less than normal be arranged.
Fig. 5 shows first embodiment that solves boundary problem, the method of touch-control IC24 scanning line of induction TRX1 to TRX9 is as aforementioned, choose two lines of induction discharges and recharges with the ADC value that obtains these two lines of induction to judge one of them induction amount of these two lines of induction at every turn, when the line of induction TRX10 at scanning boundary place, at first carry out the step S30 of Fig. 5, obtain the ADC value of several the lines of induction in line of induction TRX10 front and back of boundary, for example, the ADC value of each line of induction TRX9 and TRX11 before and after the line of induction TRX10 of boundary, then carry out step S32, these ADC values of low-pass filtering, final step S34, the ADC value behind the average filter obtains the induction amount of a preferable ADC value as boundary line of induction TRX10.
Fig. 6 shows second embodiment that solves boundary problem, the method of touch-control IC24 scanning line of induction TRX1 to TRX9 is as aforementioned, choose two lines of induction discharges and recharges with the ADC value that obtains these two lines of induction to judge one of them induction amount of these two lines of induction at every turn, and when the line of induction TRX10 at scanning boundary place, switch to single line of induction scan pattern, only use single line of induction TRX10 to judge and read the ADC value, this method at first discharges and recharges to obtain the ADC value of line of induction TRX10 the line of induction TRX10 of boundary, shown in the step S40 of Fig. 6, obtain the induction amount of preferable the 2nd an ADC value after then step S42 adjusts an ADC value as boundary line of induction TRX10, for example, an ADC on duty last 2 is produced the 2nd ADC value.
Fig. 7 shows the 3rd embodiment that solves boundary problem, in this embodiment, each touch-control IC24 and 26 only uses a line of induction to discharge and recharge at every turn and reads the ADC value, shown in step S50, then utilize the ADC value that is read to judge the induction amount of the employed line of induction again, shown in step S52.
Claims (6)
1. the detection method of a capacitive touch device, it is characterized in that, described capacitive touch device comprises a contact panel and has many lines of induction, the N bar of described many lines of induction connects one first touch-control integrated circuit, the N+1 bar of described many lines of induction connects one second touch-control integrated circuit, and described detection method comprises the following steps:
Obtain the analog digital conversion value of wherein at least one line of induction before the described N bar line of induction and the analog digital conversion value of wherein at least one line of induction after the described N bar line of induction; And
Determine the induction amount of the described N bar line of induction according to obtained analog digital conversion value.
2. detection method as claimed in claim 1 is characterized in that, the step of the induction amount of the described N bar of the described decision line of induction comprises that average obtained analog digital conversion value is to obtain the induction amount of the described N bar line of induction.
3. detection method as claimed in claim 1 is characterized in that, described detection method also comprises the analog digital conversion value that low-pass filtering is obtained.
4. the detection method of a capacitive touch device, it is characterized in that, described capacitive touch device comprises a contact panel and has many lines of induction, the N bar of described many lines of induction connects one first touch-control integrated circuit, the N+1 bar of described many lines of induction connects one second touch-control integrated circuit, and described detection method comprises the following steps:
Scan the described N bar line of induction and obtain one first analog digital conversion value; And
Produce the induction amount of one second analog digital conversion value as the described N bar line of induction, the described second analog digital conversion value is the function of the described first analog digital conversion value.
5. detection method as claimed in claim 4 is characterized in that, the step of described generation one second analog digital conversion value comprises that described first analog digital is changed on duty 2 produces the described second analog digital conversion value.
6. the detection method of a capacitive touch device is characterized in that, described capacitive touch device comprises a Trackpad and has many lines of induction and a plurality of touch-control integrated circuit in order to scan described many lines of induction, and described detection method comprises the following steps:
Each described touch-control integrated circuit only uses a line of induction to discharge and recharge to obtain an analog digital conversion value at every turn; And
Utilize described analog digital conversion value to judge the induction amount of the employed line of induction.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100925172A CN101561733A (en) | 2008-04-18 | 2008-04-18 | Method for detecting capacitive type touch-control device |
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| CNA2008100925172A CN101561733A (en) | 2008-04-18 | 2008-04-18 | Method for detecting capacitive type touch-control device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121956A (en) * | 2010-11-26 | 2011-07-13 | 苏州佳世达电通有限公司 | Detection method and system of capacitance-type touch screen |
| CN102122224A (en) * | 2011-02-24 | 2011-07-13 | 苏州瀚瑞微电子有限公司 | Circuit module and method for touch detection |
| CN102375594A (en) * | 2010-08-27 | 2012-03-14 | 瑞鼎科技股份有限公司 | Touch input device and scanning method thereof |
| CN102043503B (en) * | 2009-10-23 | 2012-06-27 | 奇景光电股份有限公司 | Reading device and multichannel reading device for touch-control panel |
| CN102915164A (en) * | 2011-08-03 | 2013-02-06 | 瑞鼎科技股份有限公司 | Touch input device for driving signal conversion |
| TWI406032B (en) * | 2009-10-22 | 2013-08-21 | Himax Tech Ltd | Readout apparatus and multi-channel readout apparatus for touch panel |
| CN104102448A (en) * | 2013-04-02 | 2014-10-15 | 义隆电子股份有限公司 | Identification Method Of Floating Control Object |
| CN104238842A (en) * | 2013-06-11 | 2014-12-24 | 义隆电子股份有限公司 | Method for identifying non-common-ground object |
| CN104598086A (en) * | 2013-10-31 | 2015-05-06 | 矽统科技股份有限公司 | Capacitive touch device and sensing method thereof |
| CN104750330A (en) * | 2013-12-31 | 2015-07-01 | 乐金显示有限公司 | Touch sensing system |
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2008
- 2008-04-18 CN CNA2008100925172A patent/CN101561733A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI406032B (en) * | 2009-10-22 | 2013-08-21 | Himax Tech Ltd | Readout apparatus and multi-channel readout apparatus for touch panel |
| CN102043503B (en) * | 2009-10-23 | 2012-06-27 | 奇景光电股份有限公司 | Reading device and multichannel reading device for touch-control panel |
| CN102375594B (en) * | 2010-08-27 | 2014-05-07 | 瑞鼎科技股份有限公司 | Touch input device and scanning method thereof |
| CN102375594A (en) * | 2010-08-27 | 2012-03-14 | 瑞鼎科技股份有限公司 | Touch input device and scanning method thereof |
| CN102121956A (en) * | 2010-11-26 | 2011-07-13 | 苏州佳世达电通有限公司 | Detection method and system of capacitance-type touch screen |
| CN102122224A (en) * | 2011-02-24 | 2011-07-13 | 苏州瀚瑞微电子有限公司 | Circuit module and method for touch detection |
| CN102122224B (en) * | 2011-02-24 | 2013-02-06 | 苏州瀚瑞微电子有限公司 | Circuit module and method for touch detection |
| CN102915164B (en) * | 2011-08-03 | 2015-06-17 | 瑞鼎科技股份有限公司 | Touch input device for driving signal conversion |
| TWI469024B (en) * | 2011-08-03 | 2015-01-11 | Raydium Semiconductor Corp | Touch input device for switching driving signals |
| CN102915164A (en) * | 2011-08-03 | 2013-02-06 | 瑞鼎科技股份有限公司 | Touch input device for driving signal conversion |
| CN104102448A (en) * | 2013-04-02 | 2014-10-15 | 义隆电子股份有限公司 | Identification Method Of Floating Control Object |
| CN104238842A (en) * | 2013-06-11 | 2014-12-24 | 义隆电子股份有限公司 | Method for identifying non-common-ground object |
| CN104238842B (en) * | 2013-06-11 | 2017-05-17 | 义隆电子股份有限公司 | Method for identifying non-common-ground object |
| CN104598086A (en) * | 2013-10-31 | 2015-05-06 | 矽统科技股份有限公司 | Capacitive touch device and sensing method thereof |
| CN104598086B (en) * | 2013-10-31 | 2018-02-09 | 矽统科技股份有限公司 | Capacitive touch device and its method for sensing |
| CN104750330A (en) * | 2013-12-31 | 2015-07-01 | 乐金显示有限公司 | Touch sensing system |
| CN104750330B (en) * | 2013-12-31 | 2018-01-23 | 乐金显示有限公司 | Touch-sensing system |
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Open date: 20091021 |