CN101576791A

CN101576791A - Capacitive touch device and control method thereof

Info

Publication number: CN101576791A
Application number: CNA2008100928772A
Authority: CN
Inventors: 黄荣寿; 杨胜超
Original assignee: Elan Microelectronics Corp
Current assignee: Elan Microelectronics Corp
Priority date: 2008-05-07
Filing date: 2008-05-07
Publication date: 2009-11-11
Anticipated expiration: 2028-05-07
Also published as: CN101576791B

Abstract

The invention provides a capacitance touch control device and a control method thereof, comprising a touch control panel and a plurality of integrated circuits connected in series for scanning the touch control panel, wherein the touch control panel is provided with a plurality of induction lines, a first integrated circuit in the plurality of integrated circuits connected in series charges and discharges a Nth induction line in the plurality of induction lines to generate a first signal, a second integrated circuit in the plurality of integrated circuits connected in series charges and discharges an N +1 th induction line in the plurality of induction lines to generate a second signal, and the first integrated circuit transmits the first signal to the second integrated circuit, so that the second integrated circuit can determine the induction quantity of the Nth induction line according to the first signal and the second signal, thereby solving the boundary problem. In addition, the integrated circuits in series transmit the scanning results of all the integrated circuits to the last integrated circuit in a relay mode for operation, thereby increasing the image capturing speed.

Description

Capacitive touch device and control method thereof

Technical field

The present invention is relevant a kind of contactor control device, particularly relevant for a kind of capacitive touch device and control method.

Background technology

On tradition is used, the large size capacitive contact panel 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 contact panel 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 (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 22 lines of induction of scanning 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

One of purpose of the present invention is to propose a kind of capacitive touch device and control method thereof that determines boundary problem.

One of purpose of the present invention is to propose a kind of capacitive touch device and control method thereof that increases capture speed.

According to the present invention, a kind of capacitive touch device and control method thereof comprise the integrated circuit of a contact panel and a plurality of serial connections, this contact panel has many lines of induction, first integrated circuit in the integrated circuit of these a plurality of serial connections discharges and recharges the N bar line of induction in these many lines of induction and produces one first signal, second integrated circuit in the integrated circuit of these a plurality of serial connections discharges and recharges the N+1 bar line of induction in these many lines of induction and produces a secondary signal, this first integrated circuit sends this first signal to this second integrated circuit, make this second integrated circuit can be, and then solve boundary problem according to the induction amount of this this N bar line of induction of first and second signal deciding.

In addition, the integrated circuit of these a plurality of serial connections all is independent running, when this first IC scanning to its last item line of induction of being responsible for, i.e. this N bar line of induction, this second integrated circuit begins to scan article one line of induction that it is responsible for, i.e. this N+1 bar line of induction, this first integrated circuit sends its scanning result to this second integrated circuit, when this second IC scanning during to the last item line of induction that it is responsible for, the 3rd integrated circuit after this second integrated circuit will begin to scan article one line of induction that it is responsible for, this second integrated circuit will all send the scanning result of itself and this first integrated circuit to the 3rd integrated circuit, in the mode of this relay the scanning result of all integrated circuit is sent to last integrated circuit and carries out computing, each integrated circuit is when having swept its last item line of induction of being responsible for, to begin to sweep from its article one line of induction of being responsible for once more, therefore, except needing the sweep time first time than long, only need just can sweep complete contact panel the sweep time of an integrated circuit afterwards, thereby increase capture speed.

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 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

30 capacitive touch devices

32 contact panels

34 touch-control IC

36 touch-control IC

40 capacitive touch devices

42 touch-control IC

44 touch-control IC

46 touch-control IC

48 touch-control IC

50 capacitive touch devices

52 contact panels

54 touch-control IC

56 touch-control IC

58 touch-control IC

60 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, array capacitor formula touch-control IC24 is responsible for scanning the line of induction TRX1 to TRX10 in the contact panel 22, and array capacitor formula touch-control IC26 is responsible for scanning the line of induction TRX11 to TRX20 in the 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 lines of induction simultaneously to discharge and recharge to obtain preferable induction amount.If above-mentioned method is applied to the words of capacitive touch device 20, with touch-control IC24 is example, when scanning line of induction TRX1, touch-control IC24 will discharge and recharge voltage or current signal to obtain line of induction TRX7 and TRX8 to line of induction TRX7 and TRX8, and use the induction amount that obtains line of induction TRX7, as shown in Figure 4.Yet, when touch-control IC24 is scanned up to its last item line of induction TRX10 that is responsible for, because touch-control IC24 does not connect line of induction TRX11, therefore touch-control IC24 can't discharge and recharge to obtain voltage or current signal line of induction TRX11, therefore can only judge with voltage or the current signal 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 the first embodiment of the present invention, capacitive touch device 30 comprises contact panel 32 and touch-control IC34 and 36, array capacitor formula touch-control IC34 is responsible for scanning the line of induction TRX1 to TRX10 of contact panel 32, array capacitor formula touch-control IC36 is responsible for scanning the line of induction TRX11 to TRX20 of contact panel 32, touch-control IC34 and 36 is all independent running, when touch-control IC34 is scanned up to its last item line of induction TRX10 that is responsible for, touch-control IC36 will begin to scan article one line of induction TRX11 that it is responsible for, simultaneously, touch-control IC34 will send touch-control IC36 to voltage or the current signal pp that line of induction TRX10 discharges and recharges generation, and then solution boundary problem, touch-control IC36 is according to discharging and recharging the voltage that obtains or the induction amount of current signal decision line of induction TRX10 from the signal pp of touch-control IC34 and to line of induction TRX11, simultaneously, touch-control IC34 also is sent to touch-control IC36 with its scanning result via exchange and data-signal and carries out computing, wherein the scanning result of touch-control IC34 comprises the induction amount of line of induction TRX1 to TRX9, certainly, when touch-control IC34 has swept the last item line of induction TRX10, will begin scanning from article one line of induction TRX1 again.In other embodiments, also can by touch-control IC36 will to line of induction TRX11 discharge and recharge and voltage or current signal send touch-control IC34 to, for the induction amount of touch-control IC34 decision line of induction TRX10.

Capacitive touch device 20 shown in Figure 5 can extend to the touch-control IC of a plurality of serial connections.Fig. 6 shows second embodiment of the present invention, capacitive touch device 40 comprises array capacitor formula touch-control IC42,44,46 and 48 sweep traces in order to same axle on the scanning contact panel (not shown), wherein touch-control IC42 is responsible for scanning line of induction TRX1 to TRX20, touch-control IC44 is responsible for scanning line of induction TRX21 to TRX40, touch-control IC46 is responsible for scanning line of induction TRX41 to TRX60, touch-control IC48 is responsible for scanning line of induction TRX61 to TRX80, touch-control IC42,44,46 and 48 all independent runnings, when touch-control IC42 is scanned up to its last item line of induction TRX20 that is responsible for, touch-control IC44 also begins to scan line of induction TRX21 simultaneously, then touch-control IC42 will transmit signal pp1 and exchange and data-signal and give touch-control IC44, wherein signal pp1 be to line of induction TRX20 discharge and recharge and voltage or current signal, and exchange that touch-control IC42 is sent and data-signal comprise the scanning result of touch-control IC42, when touch-control IC42 line of induction TRX20 is finished discharge and recharge after, to begin scanning by its article one line of induction TRX1 that is responsible for again, touch-control IC44 discharges and recharges the induction amount that the voltage that get or current signal determine line of induction TRX20 according to signal pp1 and to line of induction TRX21, when touch-control IC44 is scanned up to its last item line of induction TRX40 that is responsible for, its also will to line of induction TRX40 discharge and recharge and voltage or current signal pp2 pass to next touch-control IC46, simultaneously also the scanning result of touch-control IC44 with and scanning result pass knot touch-control IC46 via exchange and data-signal, when touch-control IC44 line of induction TRX40 is finished discharge and recharge after, to begin scanning by its article one line of induction TRX21 that is responsible for again, by that analogy, last touch-control IC42,44 and 46 results that scanned are sent to last touch-control IC48 to carry out computing in the mode of relay, and except retouching for the first time flyback time than long, afterwards via the mode of conduit (pipeline) relay, almost as long as the induction amount that just can obtain all lines of induction sweep time of an IC, with present embodiment, as long as the time of 20 lines of induction of cost scanning, just can obtain the induction amount of 80 lines of induction, therefore can significantly increase the frequency of scanning, promptly increase capture speed.Moreover each touch-control IC is responsible for it the voltage or the current signal of the last item line of induction of scanning and passes to next touch-control IC, thereby solves boundary problem.

Fig. 7 shows the third embodiment of the present invention, capacitive touch device 50 comprises contact panel 52 and touch-control IC54,56,58 and 60, wherein touch-control IC54 scans the line of induction TRY21 to TRY40 of Y-axis on the contact panel 52, the line of induction TRY1 to TRY20 of Y-axis on the touch-control IC56 scanning contact panel 52, the line of induction TRX1 to TRX20 of X-axis on the touch-control IC58 scanning contact panel 52, the line of induction TRX21 to TRX40 of X-axis on the touch-control IC60 scanning contact panel 52, touch-control IC54,56,58 and 60 connect in the serial connection mode, and in the relay mode scanning result of each touch-control IC are sent to last touch-control IC60 to accelerate capture speed.In addition, touch-control IC54 passes to touch-control IC56 with the boundary problem between the solution touch-control IC54 and 56 with voltage or the current signal of line of induction TRY21, and touch-control IC58 also passes to touch-control IC60 to solve the boundary problem between the touch-control IC58 and 60 with voltage or the current signal of line of induction TRX20.

Claims

1. A capacitive touch device, characterized in that, the capacitive touch device comprises:

A touch panel with multiple sensing lines;

A first integrated circuit, charging and discharging the Nth sensing line among the plurality of sensing lines to generate a first signal; and

A second integrated circuit, charging and discharging the N+1th sensing line among the plurality of sensing lines to generate a second signal;

Wherein, the first integrated circuit transmits the first signal to the second integrated circuit, and the second integrated circuit obtains the sensing value of the Nth sensing line according to the first and second signals.

2. A capacitive touch device, characterized in that the capacitive touch device comprises:

a touch panel;

A plurality of serially connected integrated circuits are used to scan the touch panel, and each integrated circuit transmits the scanning result obtained after scanning and the scanning result from the previous integrated circuit to the subsequent integrated circuit.

3. The capacitive touch device according to claim 2, wherein the scan results of the plurality of serially connected integrated circuits are calculated on the last integrated circuit in the plurality of serially connected integrated circuits .

4. A control method for a capacitive touch device, wherein the capacitive touch device comprises a touch panel with a plurality of sensing lines, a first integrated circuit and a second integrated circuit, the control The method includes the following steps:

Using the first integrated circuit to charge and discharge the Nth sensing line among the plurality of sensing lines to generate a first signal to the second integrated circuit;

Using the second integrated circuit to charge and discharge the N+1th sensing line among the plurality of sensing lines to generate a second signal; and

The sensing amount of the Nth sensing line is determined according to the first and second signals.

5. A control method for a capacitive touch device, the capacitive touch device comprising a touch panel and a plurality of serially connected integrated circuits, characterized in that the control method comprises the following steps;

scanning the touch panel with the plurality of serially connected integrated circuits; and

The scan results of each said integrated circuit and the scan results from the previous integrated circuit are transmitted to the subsequent integrated circuit.

6. The control method according to claim 5, wherein the control method further comprises using the last integrated circuit in the plurality of serially connected integrated circuits to calculate the plurality of serially connected integrated circuits scan results.