CN101556522B - Capacitance type touch control device and data transmission method applied to same - Google Patents

Abstract

The invention relates to a capacitance type touch control device and a data transmission method applied to the same. The capacitance type touch control device comprises a first integrated circuit and a second integrated circuit. The data transmission method applied to the capacitance type touch control device comprises the following steps: a scanning data is transmitted to the first integrated circuit by the second integrated circuit, and the contents of the scanning data comprise the total of the induction quantities of all induction lines scanned by the second integrated circuit on a direction axis, the total of product of the induction quantity of every induction line scanned by the second integrated circuit on the direction axis and the serial number of every induction line, and the object number checked by the second integrated circuit on the direction axis, whether the induction quantity of a first induction line scanned by the second integrated circuit on the direction axis is zero or not, and whether the induction quantity of a last induction line scanned by the second integrated circuit on the direction axis is zero or not.

Description

Capacitive touch device and be applied in the data transmission method of capacitive touch device

Technical field

The relevant a kind of capacitive touch device of the present invention and be applied in the data transmission method of this capacitive touch device.

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 the action that it need discharge and recharge each point sensor (Point Sensor), 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, touch-control IC 12 accounts for whole contact panel to the time that capacitor charge and discharge spent at every turn, and to use the ratio that goes up capture speed very big, that is to say the capture speed issue mainly by touch-control IC 12 in each frame (frame) to the line of induction discharge and recharge determine, 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, the data transmission method that is to propose a kind of capacitive touch device and is applied in this capacitive touch device.

A kind of capacitive touch device comprises that a contact panel has many lines of induction, one first integrated circuit, and the line of induction that one second IC scanning is responsible for gives this first integrated circuit to carry out computing to send scan-data.According to the present invention, a kind of data transmission method that is applied in this capacitive touch device comprises that the summation that allows this second integrated circuit send on an axis of orientation induction amount of its all lines of induction of being responsible for scanning earlier gives this first integrated circuit, then send the induction amount of each bar line of induction that this second integrated circuit is scanned on this axis of orientation and the summation of its numbering product and give this first integrated circuit, and then send a first information and inform this first integrated circuit detected object number on this axis of orientation, and then one second information of sending again is responsible for to inform on this axis of orientation this second integrated circuit whether the induction amount of article one line of induction of scanning serves as zero for this first integrated circuit, sends this first integrated circuit of one the 3rd information notification this second integrated circuit on this axis of orientation at last and is responsible for whether the induction amount of the last item line of induction of scanning is zero.

The present invention helps to realize large-sized capacitance type touch-control panel, and then more applications is provided.

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 the capacitive touch device that uses two above array capacitor formula touch-control IC;

Secondary touch-control IC transfers data to the process flow diagram of main touch-control IC in Fig. 4 displayed map 3; And

Fig. 5 shows the data structure that obtains according to Fig. 4 data transmission method.

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

28 touch-control IC

30 touch-control IC

32 touch-control IC

Field in 50 data structures

Field in 52 data structures

Field in 54 data structures

Field in 56 data structures

Field in 58 data structures

Embodiment

Fig. 3 shows the capacitive touch device 20 that uses two above array capacitor formula touch-control IC, four AI type array capacitor formula touch-control IC 24 wherein, 26,28 and 30 as secondary touch-control IC in order to scan large-sized contact panel 22, suppose that contact panel 22 has 80 lines of induction, secondary touch-control IC 24,26,28 and 30 each be responsible for scanning 20 lines of induction to improve capture speed, each secondary touch-control IC 24 wherein, 26,28 and 30 can only be responsible for one of scanning axial or more than one axially, main touch-control IC 32 receives from secondary touch-control IC 24,26,28 and 30 scan-data also carries out last integral operation, main afterwards touch-control IC 32 carries out follow-up action at needed application again, main touch-control IC 32 is overall operation and responsible and the external communication of control capacitance formula contactor control device 20 also, if there is the main touch-control IC 32 of needs also can participate in scanning work, shown in dotted line, and secondary touch-control IC 24,26,28 and 30 also can add partial arithmetic in wherein to reduce the load of main touch-control IC 32.

Secondary touch-control IC transfers data to the process flow diagram of main touch-control IC in Fig. 4 displayed map 3, is example with the data transmission between secondary touch-control IC 24 and the main touch-control IC 32, and at first secondary touch-control IC 24 sends information Sum_dV earlier _iGive main touch-control IC 32, shown in the step S40 of Fig. 4, this information Sum_dV _iFor this pair touch-control IC 24 is responsible for the summation of induction amount of all lines of induction of scanning on an axis of orientation (axis), follow secondary touch-control IC 24 and send information Sum_dV again _iR _iGive main touch-control IC 32, shown in step S42, information Sum_dV _iR _iThe induction amount of each the bar line of induction that on this axis of orientation, is scanned for secondary touch-control IC 24 and the summation of its numbering product, for instance, suppose that secondary touch-control IC 24 scanning X-direction numberings are respectively 1,2 and 3 the line of induction, and the induction amount of these lines of induction is respectively dV_1, dV_2 and dV_3, the information Sum_dV that then secondary touch-control IC 24 is sent _iR _i=dV_1 * 1+dV_2 * 2+dV_3 * 3.And then carrying out step S44 allows secondary touch-control IC 24 send information FingerNum to main touch-control IC 32, information FingerNum vice touch-control IC 24 detected finger number on this axis of orientation, follow secondary touch-control IC 24 and send information FrontEdge again to main touch-control IC 32, whether information FrontEdge vice touch-control IC 24 is responsible for article one line of induction of scanning on this axis of orientation induction amount is zero, shown in step S46, last secondary touch-control IC 24 sends information LastEdge and gives main touch-control IC 32, information LastEdge is illustrated in whether the induction amount that secondary touch-control IC 24 on this axis of orientation is responsible for the last item line of induction of scanning is zero, shown in step S48.

Fig. 5 shows the data structure that obtains according to Fig. 4 data transmission method, and it comprises field 50 store information Sum_dV _iIn order to inform that main touch-control IC 32 secondary touch-control IC 24 on an axis of orientation is responsible for the summation of induction amount of all lines of induction of scanning, field 52 store information Sum_dV _iR _iIn order to the induction amount of informing main touch-control IC 32 each bar line of induction that secondary touch-control IC 24 is scanned on this axis of orientation and the summation of its numbering product, field 54 store information FingerNum are in order to inform main touch-control IC 32 secondary touch-control IC 24 detected finger numbers on this axis of orientation, field 56 store information FrontEdge are in order to informing that whether the induction amount that main touch-control IC 32 secondary touch-control IC 24 on this axis of orientation is responsible for article one line of induction of scanning is zero, and field 58 store information LastEdge are in order to inform whether the induction amount that main touch-control IC 32 secondary touch-control IC 24 on this axis of orientation is responsible for the last item line of induction of scanning is zero.

In like manner, other secondary touch-control IC 26,28 and 30 operation are also as mentioned above.Need not utilize under the application that concerns between induction amount or front and back frame (frame) induction amount, method of the present invention can send data to main touch-control IC faster.

Main touch-control IC 32 is with all secondary touch-control IC 24,26,28 and the 30 information Sum_dV that transmitted _iAnd Sum_dV _iR _iTo obtain information after adding up respectively

$\mathrm{Sum}\_\mathrm{dV}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\mathrm{Sun}\_d{V}_i$ Formula 1

And

$\mathrm{Sum}\_\mathrm{dVR}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}({\mathrm{Offset}}_i+\mathrm{Sum}\_d{V}_i{R}_i)$ Formula 2

Wherein, N is the sum of secondary touch-control IC, Offset _iIt is the line of induction initial value numbering deviation of the 1st the required consideration of secondary touch-control IC.In main touch-control IC 32, utilize Sum_dVR can calculate finger center position on this axis of orientation divided by Sum_dV, information FingerNum is the finger number that secondary touch-control IC is calculated in this axis of orientation again, the induction amount that then secondary touch-control IC article one should be felt line when information FrontEdge was particular value is non-vanishing, the induction amount that then secondary touch-control IC the last item should be felt line when information LastEdge was particular value is non-vanishing, be with, utilize each secondary touch-control IC 24,26,28 and 30 information that provided, main touch-control IC 32 can calculate the finger center and finger number on this axis of orientation.

Claims (6)

1. data transmission method that is applied in capacitive touch device, described capacitive touch device comprises one first integrated circuit and one second integrated circuit, and described data transmission method comprises the following steps:

Send the summation of induction amount of being responsible for all lines of induction of scanning at the above second integrated circuit of an axis of orientation and give described first integrated circuit;

Send the induction amount of each the bar line of induction that is scanned at the above second integrated circuit of described axis of orientation and the summation of its numbering product and give described first integrated circuit;

Sending a first information is illustrated in the above the detected object number of second integrated circuit of described axis of orientation for described first integrated circuit, the described first information;

One second information of sending is given described first integrated circuit, and whether article one line of induction of scanning is responsible in described second information representation at the above second integrated circuit of described axis of orientation induction amount is zero; And

One the 3rd information of sending is given described first integrated circuit, and whether the last item line of induction of scanning is responsible in described the 3rd information representation at the above second integrated circuit of described axis of orientation induction amount is zero.

2. a capacitive touch device is characterized in that, described capacitive touch device comprises:

One contact panel has many lines of induction;

One first integrated circuit; And

One second integrated circuit, the line of induction that scanning is responsible for is also sent scan-data and is given described first integrated circuit to carry out computing, and the data structure of described scan-data comprises:

One first field is responsible for the summation of induction amount of all lines of induction of scanning in order to inform described first integrated circuit at the above second integrated circuit of an axis of orientation;

One second field is after described first field, in order to the induction amount of informing each bar line of induction that described first integrated circuit is scanned at the above second integrated circuit of described axis of orientation and the summation of its numbering product;

One the 3rd field is after described second field, in order to inform that described first integrated circuit is in the above the detected object number of second integrated circuit of described axis of orientation;

One the 4th field after described the 3rd field, is responsible at the above second integrated circuit of described axis of orientation in order to inform described first integrated circuit whether the induction amount of article one line of induction of scanning is zero; And

One the 5th field after described the 4th field, is responsible at the above second integrated circuit of described axis of orientation in order to inform described first integrated circuit whether the induction amount of the last item line of induction of scanning is zero.

3. capacitive touch device as claimed in claim 2 is characterized in that, described first integrated circuit is calculated object centers position and object number on described axis of orientation according to the scan-data of being received.

4. capacitive touch device as claimed in claim 2 is characterized in that described first integrated circuit is controlled the overall operation of described capacitive touch device.

5. capacitive touch device as claimed in claim 2 is characterized in that, described first integrated circuit is responsible for and external communication.

6. capacitive touch device as claimed in claim 2 is characterized in that, described second integrated circuit comprises shaft staggered type array capacitor formula touch-control integrated circuit.

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