CN101639748B - Capacitive touch device and detection method thereof - Google Patents
Capacitive touch device and detection method thereof Download PDFInfo
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- CN101639748B CN101639748B CN2008101280926A CN200810128092A CN101639748B CN 101639748 B CN101639748 B CN 101639748B CN 2008101280926 A CN2008101280926 A CN 2008101280926A CN 200810128092 A CN200810128092 A CN 200810128092A CN 101639748 B CN101639748 B CN 101639748B
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Abstract
The invention relates to a capacitive device and a detection method thereof. The device comprises a touch panel, a first axis intersect array capacitive touch integrated circuit and a second axis intersect array capacitive touch integrated circuit, wherein the touch panel is provided with a plurality of sensing lines; and the first and second axis intersect array capacitive touch integrated circuits are used for charging and discharging the plurality of sensing lines, and wherein the sensing lines connected with the first and second axis intersect array capacitive touch integrated circuits are partially overlapped to solve a boundary problem and to obtain better sensing amount.
Description
Technical field
The present invention is relevant a kind of capacitive touch device and detection method thereof.
Background technology
On tradition is used, the large size capacitive Touch 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.
(All 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 (framerate) 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 an AI type array capacitor formula touch-control IC 12 scanning contact panels 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 IC 12 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 IC 12 can scan, yet, it is very big that touch-control IC 12 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 IC 12 each frame (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 capacitive touch device and detection method thereof.
The invention provides a kind of capacitive touch device, described device comprises a contact panel, one first shaft staggered type array capacitor formula touch-control integrated circuit and one second shaft staggered type array capacitor formula touch-control integrated circuit, this contact panel has many lines of induction, the N bar line of induction in these many lines of induction connects the first shaft staggered type array capacitor formula touch-control integrated circuit and the second shaft staggered type array capacitor formula touch-control integrated circuit simultaneously, but this first and second shaft staggered type array capacitor formula touch-control integrated circuit does not does not discharge and recharge this N bar line of induction simultaneously, when this first shaft staggered type array capacitor formula touch-control integrated circuit discharges and recharges this N bar line of induction, this N bar inductive line pair is suspension joint or high impedance in the pass of this second shaft staggered type array capacitor formula touch-control integrated circuit, when this second shaft staggered type array capacitor formula touch-control integrated circuit discharged and recharged this N bar line of induction, this N bar inductive line pair was suspension joint or high impedance in the pass of this first shaft staggered type array capacitor formula touch-control integrated circuit.The present invention solves the boundary problem that produces when using this contact panel of IC scanning more than two with the overlapping layout type of the line of induction, and utilize two integrated circuit for same the line of induction to read value difference different, revise the drop of the value of reading to each other when taking in the rear end; In addition, use this second reading value through filtered value value of reading as this line of induction, the influence that noise caused also can be improved.
The present invention also provides a kind of capacitive touch device detection method, described capacitive touch device comprises a contact panel and has many lines of induction, one first shaft staggered type array capacitor formula touch-control integrated circuit is in order to discharge and recharge the N bar line of induction in described many lines of induction, and one second shaft staggered type array capacitor formula touch-control integrated circuit in order to the described N bar line of induction is discharged and recharged, described detection method comprises the following steps: when the described first shaft staggered type array capacitor formula touch-control integrated circuit discharges and recharges the described N bar line of induction, allows the described N bar inductive line pair be suspension joint or high impedance in the pass of the described second shaft staggered type array capacitor formula touch-control integrated circuit; And when the described second shaft staggered type array capacitor formula touch-control integrated circuit discharges and recharges the described N bar line of induction, allow the described N bar inductive line pair be suspension joint or high impedance in the pass of the described first shaft staggered type array capacitor formula touch-control integrated circuit.
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 traditional AI type array capacitor formula detection technology is applied in the situation on the 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 the first embodiment of the present invention;
Fig. 6 shows the second embodiment of the present invention; And
Fig. 7 shows the third embodiment of the present invention.
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 IC 24 scanning contact panels 22, the line of induction TRX11 to TRX20 in the touch-control IC 26 scanning contact panels 22.Owing to scan contact panel 22 with many AI type array capacitor formula touch-control IC, when therefore being applied in large size panel, not only have to refer to touch controllable function more, also have good capture speed because many AI type array capacitor formula touch- control IC 24 and 26 can scan for the line of induction simultaneously.In the scan mode of capacitance touching control IC, be generally and obtained bigger induction value, discharge and recharge to obtain higher sensitivity (Sensitivity) in electric capacity choosing two inductive line pairs simultaneously.
Use above-mentioned scan mode, cooperate the common scanning of two capacitance touching control IC same axially, 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, and according to the induction amount of the ADC value that obtains decision line of induction TRX7, the rest may be inferred, utilizes the induction amount of the ADC value decision line of induction TRX8 of line of induction TRX8 and TRX9, utilizes 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 IC 24 and line of induction TRX11 connects touch-control IC 26, 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.
The present invention solves because of using touch-control IC more than two to scan the same boundary problem that produces when axial of contact panel with the overlapping layout type of the line of induction.Fig. 5 shows the first embodiment of the present invention, wherein touch-control IC 24 connects line of induction TRX1 to TRX10 equally, and touch-control IC 26 is except connecting line of induction TRX11 to TRX20, also connect line of induction TRX10, in other words, line of induction TRX10 is overlapping in the touch- control IC 24 and 26 lines of induction that connected, and line of induction TRX10 connects touch- control IC 24 and 26 simultaneously.Carry out in the charging and discharging process once choosing two lines of induction, because touch-control IC24 is when scanning line of induction TRX1 to TRX8, the not action that line of induction TRX10 is discharged and recharged, if during this period touch-control IC 24 is set at suspension joint or high impedance for the relation of line of induction TRX10, then during this period in 26 couples of line of induction TRX10 of touch-control IC discharge and recharge and will touch-control IC 24 not exerted an influence; Same, when 24 couples of line of induction TRX10 of touch-control IC discharge and recharge, if touch-control IC 26 is suspension joint or high impedance for the pass of line of induction TRX10, to touch-control IC 26 not exerted an influence when then 24 couples of line of induction TRX10 of touch-control IC discharge and recharge, that is to say, touch- control IC 24 and 26 does not does not discharge and recharge line of induction TRX10 simultaneously, and when one of them discharged and recharged sharing line of induction TRX10, another must be set at suspension joint or high impedance with the pin that connects this line of induction.Furthermore, suppose that touch- control IC 24 and 26 begins scanning synchronously, when choosing line of induction TRX1 and TRX2, touch-control IC 24 discharges and recharges when reading the induction amount of line of induction TRX1,26 of touch-control IC discharge and recharge to obtain the induction amount of line of induction TRX10 line of induction TRX10 and TRX11, and then solution boundary problem, because this moment, line of induction TRX10 was suspension joint or high impedance for touch-control IC 24, therefore 26 couples of line of induction TRX10 of touch-control IC discharge and recharge and do not influence touch-control IC 24, when choosing line of induction TRX9 and TRX10, touch-control IC 24 discharges and recharges when obtaining the induction amount of line of induction TRX9, touch-control IC 26 will not discharge and recharge line of induction TRX10, this moment, line of induction TRX10 was suspension joint or high impedance for touch-control IC 26, did not influence touch-control IC 26 so 24 couples of line of induction TRX10 of touch-control IC discharge and recharge.
Fig. 6 shows the second embodiment of the present invention, wherein touch- control IC 24 and 26 all connects line of induction TRX8, TRX9 and TRX10, as previously mentioned, touch- control IC 24 and 26 does not does not discharge and recharge same line of induction TRX8, TRX9 or TRX10 simultaneously, for example, when 24 couples of line of induction TRX8 of touch-control IC discharge and recharge, touch-control IC 26 is suspension joint or high impedance for the pass of line of induction TRX8, same, when 26 couples of line of induction TRX8 of touch-control IC discharged and recharged, touch-control IC 24 was suspension joint or high impedance for the pass of line of induction TRX8.In this embodiment, discharge and recharge if choose two lines of induction at every turn, touch-control IC24 and 26 can obtain the induction amount of line of induction TRX8 and TRX9, therefore the induction amount of the touch- control IC 24 and 26 obtained same the lines of induction can be carried out filtering, for example average action, reducing different touch-control IC, and obtain the difference between the induction amount, and then obtain preferable induction amount through preliminary difference of proofreading and correct after (calibration).
Carry out charging and discharging process to choose two lines of induction at every turn, the overlapping layout type of the line of induction of the present invention can be generalized at most as touch-control IC 24 and chooses line of induction TRX[N] and TRX[N+1] when discharging and recharging, touch-control IC 26 chooses line of induction TRX[N+2] and TRX[N+3] discharge and recharge, all be set at suspension joint or high impedance status for the pin that does not does not discharge and recharge.Fig. 7 shows the third embodiment of the present invention, when touch-control IC 24 chooses line of induction TRX1 and TRX2 when obtaining the induction amount of line of induction TRX1, touch-control IC 26 chooses line of induction TRX3 and TRX4 to obtain the induction amount of line of induction TRX3, when touch-control IC 24 chooses line of induction TRX2 and TRX3 when obtaining the induction amount of line of induction TRX2, touch-control IC 26 chooses line of induction TRX4 and TRX5 to obtain the induction amount of line of induction TRX4, by that analogy, touch- control IC 24 and 26 does not have situation about simultaneously same the line of induction being discharged and recharged.
Claims (2)
1. a capacitive touch device is characterized in that, described capacitive touch device comprises:
One contact panel has many lines of induction;
One first shaft staggered type array capacitor formula touch-control integrated circuit is in order to discharge and recharge the N bar line of induction in described many lines of induction; And
One second shaft staggered type array capacitor formula touch-control integrated circuit, in order to the described N bar line of induction is discharged and recharged, described first and second shaft staggered type array capacitor formula touch-control integrated circuit does not does not discharge and recharge the described N bar line of induction simultaneously, when the described first shaft staggered type array capacitor formula touch-control integrated circuit discharges and recharges the described N bar line of induction, described N bar inductive line pair is suspension joint or high impedance in the pass of the described second shaft staggered type array capacitor formula touch-control integrated circuit, when the described second shaft staggered type array capacitor formula touch-control integrated circuit discharged and recharged the described N bar line of induction, described N bar inductive line pair was suspension joint or high impedance in the pass of the described first shaft staggered type array capacitor formula touch-control integrated circuit.
2. the detection method of a capacitive touch device, described capacitive touch device comprises a contact panel and has many lines of induction, one first shaft staggered type array capacitor formula touch-control integrated circuit is in order to discharge and recharge the N bar line of induction in described many lines of induction, and one second shaft staggered type array capacitor formula touch-control integrated circuit in order to the described N bar line of induction is discharged and recharged, described detection method comprises the following steps:
When the described first shaft staggered type array capacitor formula touch-control integrated circuit discharges and recharges the described N bar line of induction, allow the described N bar inductive line pair be suspension joint or high impedance in the pass of the described second shaft staggered type array capacitor formula touch-control integrated circuit; And
When the described second shaft staggered type array capacitor formula touch-control integrated circuit discharges and recharges the described N bar line of induction, allow the described N bar inductive line pair be suspension joint or high impedance in the pass of the described first shaft staggered type array capacitor formula touch-control integrated circuit.
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| CN2008101280926A CN101639748B (en) | 2008-07-29 | 2008-07-29 | Capacitive touch device and detection method thereof |
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| CN2008101280926A CN101639748B (en) | 2008-07-29 | 2008-07-29 | Capacitive touch device and detection method thereof |
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| CN101639748A CN101639748A (en) | 2010-02-03 |
| CN101639748B true CN101639748B (en) | 2011-04-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102375534B (en) * | 2010-08-19 | 2014-07-30 | 宏达国际电子股份有限公司 | Electronic device and related control method thereof |
| TWI433017B (en) | 2010-08-19 | 2014-04-01 | Htc Corp | Electronic device and control method thereof |
| 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 |
| CN102478991B (en) * | 2010-11-26 | 2014-11-26 | 群康科技(深圳)有限公司 | Method for detecting touch point on touch screen |
| KR102112092B1 (en) * | 2013-12-31 | 2020-05-19 | 엘지디스플레이 주식회사 | Touch sensing system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1661624A (en) * | 2004-02-26 | 2005-08-31 | 义隆电子股份有限公司 | Capacitance type touch pad for simplifying scanning lines and detection method |
| CN101086565A (en) * | 2006-02-24 | 2007-12-12 | 三星电子株式会社 | Display device and method of controlling touch detection unit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1661624A (en) * | 2004-02-26 | 2005-08-31 | 义隆电子股份有限公司 | Capacitance type touch pad for simplifying scanning lines and detection method |
| CN101086565A (en) * | 2006-02-24 | 2007-12-12 | 三星电子株式会社 | Display device and method of controlling touch detection unit |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2007-172028A 2007.07.05 |
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