CN101561731A - Capacitive touch device and control method thereof - Google Patents

Abstract

The present invention relates to a capacitive touch device and a control method thereof, comprising a large-sized touch panel, at least one first integrated circuit and a second integrated circuit, wherein the at least one first integrated circuit scans the touch panel, and the second integrated circuit can participate in the scanning work in addition to controlling the overall operation, receiving data, performing final calculations and communicating with the outside. In addition, the at least one first integrated circuit can also add part of the calculations therein. The capacitive touch device has a multi-finger touch function and can effectively improve the image acquisition speed.

Description

Capacitive touch device and control method thereof

technical field

The present invention relates to a capacitive touch device, in particular to a capacitive touch device that uses more than two arrayed capacitive (projected capacitance) touch integrated circuits (Integrated Circuit; IC) to scan a large-size touch panel. and its control methods.

Background technique

In traditional applications, large-size capacitive touch screens use surface capacitive sensing technology, but surface capacitive sensing technology uses a set of currents flowing to each terminal of the screen to determine the position of the finger. When the number of fingers touching the touch panel is more than two fingers, the number of reported current groups is still one, so only one set of absolute coordinate positions can be identified. For example, only one set of X and Y parameters can be reported in a two-dimensional matrix, so The function of multi-finger touch cannot be achieved.

Although All Points Addressable (APA) type array capacitive sensing technology can achieve the function of multi-finger touch, it needs to charge and discharge each point sensor (Point Sensor) to For a matrix-shaped touch panel, when the sensing lines (trace) of the X-axis and Y-axis increase, the number of pixels of the APA-type array capacitive type will increase sharply, resulting in a decrease in the frame rate, so it is not applicable For large size touch panel applications.

Another Axis Intersect (AI) type array capacitive sensing technology can also achieve the function of multi-finger touch. FIG. 1 shows the AI-type array capacitive sensing technology traditionally applied to small-size touch panels, which includes a small-size touch panel 10 and an AI-type array capacitive touch IC12 to scan the touch panel 10, with a maximum possible Take the AI-type array capacitive touch IC12 that supports scanning of 22 sensing lines as an example. The imaging speed is not bad, but if the AI-type array capacitive touch IC12 is to be applied to a large-size touch panel 14 with 40 sensing lines TRX1-TRX40 and TRY1-TRY40 on the X-axis and Y-axis respectively, as shown in Figure 2 However, it is necessary to increase the total number of sensing lines that can be scanned by the AI-type array capacitive touch IC12. However, the time spent by the touch IC12 on charging and discharging the capacitor each time accounts for a very large proportion of the image acquisition speed of the overall touch panel application. Large, that is to say, the imaging speed is mainly determined by the charge and discharge of the capacitor in each frame of the IC12, so the method of increasing the number of scannable sensing lines applied to the large-size touch panel 14 will have a very large disadvantage , that is, the imaging speed of the overall application will be seriously reduced, which will affect the performance of the application.

Therefore, a sensing method with multi-finger touch function and good imaging speed applied to large-sized panels is expected.

Contents of the invention

One of the objectives of the present invention is to provide a capacitive touch device and a control method thereof that use more than two arrayed capacitive touch ICs to scan a large-size touch panel.

One of the objectives of the present invention is to provide a capacitive touch device with multi-finger touch function and good image capture speed applied to a large-size touch panel and a control method thereof.

According to the present invention, a capacitive touch device and its control method include a large-sized touch panel, at least a first integrated circuit and a second integrated circuit. Wherein the at least one first integrated circuit is mainly responsible for scanning the touch panel, if necessary, the at least one first integrated circuit can also add part of the operation therein. The second integrated circuit is mainly used to control the overall operation of the capacitive touch device, perform final calculation on the scanned data from the at least one first integrated circuit, and communicate with the outside, and the second integrated circuit can also participate in the scanning work .

The capacitive touch device has a multi-finger touch function, and can also effectively improve the imaging speed.

Description of drawings

Figure 1 shows the AI-type array capacitive sensing technology traditionally applied to small-sized touch panels;

Figure 2 shows the AI-type array capacitive sensing technology traditionally applied to large-size touch panels;

Figure 3 shows a first embodiment of the present invention;

Figure 4 shows a second embodiment of the present invention;

Figure 5 shows a third embodiment of the present invention;

Figure 6 shows a fourth embodiment of the present invention;

Figure 7 shows a fifth embodiment of the present invention;

Figure 8 shows a sixth embodiment of the present invention; and

Fig. 9 shows a seventh embodiment of the present invention.

Figure number:

10 touch panel

12 Touch IC

14 Touch panel

20 capacitive touch device

22 touch panel

24 Touch IC

26 Touch IC

30 capacitive touch device

32 touch panel

34 Touch IC

36 Touch IC

38 Touch IC

40 capacitive touch device

42 Touch panel

44 Touch IC

46 Touch IC

48 Touch IC

50 capacitive touch devices

52 touch panel

54 Touch IC

56 Touch IC

58 Touch IC

60 touch IC

62 touch IC

70 capacitive touch device

72 Touch panel

74 Touch IC

76 touch IC

78 Touch IC

80 touch IC

82 Touch IC

90 capacitive touch device

92 touch panel

94 Touch IC

96 Touch IC

98 Touch IC

100 touch IC

102 touch IC

110 capacitive touch device

112 touch panel

114 touch IC

116 touch IC

118 touch IC

120 Touch IC

122 Touch IC

Detailed ways

FIG. 3 shows the first embodiment of the present invention. The capacitive touch device 20 includes a large-size touch panel 22 and two AI-type array capacitive touch ICs 24 and 26, wherein the touch panel 22 has m sensing lines TR1- TRm, the auxiliary touch IC24 scans from the sensing line TR1 to the sensing line TRn, and the main touch IC26 can scan from the sensing line TRn or TRn+1 to the sensing line TRm, so as to avoid charging and discharging the same sensing line at the same time; of course Conversely, the auxiliary touch IC24 can scan from the sensing line TRn to the sensing line TR1, at this time, the main touch IC26 starts scanning from the sensing line TRm to the sensing line TRn or TRn+1, and the main touch IC26 sends the clock CLK to the auxiliary touch The touch IC24 captures the data of the sub-touch IC24 synchronously, the sub-touch IC24 sends the scanned data SDA obtained after scanning to the main touch IC26, and the main touch IC26 scans the scan data SDA from the sub-touch IC24 and scans itself The obtained result is finally calculated to determine the position of the object on the touch panel 22. In addition, the main touch IC 26 also controls the overall operation of the capacitive touch device 20 and is responsible for communicating with the outside, and the auxiliary touch IC 24 can also add part of the calculation. In order to reduce the load of the main touch IC 26 , for example, the auxiliary touch IC 24 may first perform calculations on the scanning results, and then transmit the calculated scan data SDA to the main touch IC 26 . Since the touch ICs 24 and 26 can scan at the same time and each is only responsible for scanning a part of the sensing lines, assuming m=40 and n=20, it only takes the time to scan 20 sensing lines to make a touch panel with 40 sensing lines 22 scans once, so the imaging speed can be effectively improved.

FIG. 4 shows a second embodiment of the present invention. In a capacitive touch device 30, three AI-type array capacitive touch ICs 34, 36 and 38 are used to scan a large-size touch panel 32, wherein the touch panel 32 has There are m sensing lines TR1-TRm, the auxiliary touch IC34 scans from the sensing line TR1 to the sensing line TRk, the auxiliary touch IC36 scans from the sensing line TRk or TRk+1 to the sensing line TRn, and the main touch IC38 scans from the sensing line TRn Or TRn+1 starts to scan to the sensing line TRm, the main touch IC38 sends the clock CLK to the sub-touch IC34 and 36, and uses the address (address) signal AD to select the sub-touch IC34 and 36, and the sub-touch IC34 and 36 The scanning data SDA obtained after scanning is sent to the main touch IC 38, and the main touch IC 38 performs a final calculation on the scanning data SDA from the auxiliary touch ICs 34 and 36 and the results obtained by itself to determine the position of the object on the touch panel 32. At the same time, the main touch IC38 is also responsible for controlling the overall operation of the capacitive touch device 30 and communicating with the outside. In addition to being responsible for scanning, the sub-touch IC34 and 36 can also add part of the calculation to reduce the number of main touch IC38. load. Since the touch ICs 34 , 36 and 38 can scan at the same time and each is only responsible for scanning part of the sensing lines, the imaging speed can be effectively improved.

FIG. 5 is a third embodiment of the present invention. A capacitive touch device 40 includes a large-size touch panel 42 and three AI-type array capacitive touch ICs 44, 46 and 48, wherein the touch panel 42 has m sensing lines From TR1 to TRm, the auxiliary touch IC44 scans from the sensing line TR1 to the sensing line TRn, the auxiliary touch IC46 scans from the sensing line TRn or TRn+1 to the sensing line TRm, and the main touch IC48 does not participate in the scanning work, it is only responsible for Control the overall operation, receive data, perform the final calculation and communicate with the outside, the main touch IC48 sends the clock CLK to the sub-touch IC44 and 46, and uses the address signal AD to select the sub-touch IC44 and 46, the sub-touch IC44 and 46 transmits the scanning data SDA obtained after scanning to the main touch IC 48 , and the main touch IC 48 performs final calculation on the scanning data SDA from the auxiliary touch ICs 44 and 46 to determine the position of the object on the touch panel 42 . In addition to scanning, the sub-touch ICs 44 and 46 can also add part of calculations to reduce the load of the main touch IC 48 . Since the sub-touch ICs 44 and 46 can scan at the same time and each is only responsible for scanning part of the sensing lines, the imaging speed can be effectively improved. In other embodiments, the AI-type array capacitive touch IC 48 may also be replaced by other ICs with computing functions.

FIG. 6 shows a fourth embodiment of the present invention. A capacitive touch device 50 includes a large-size touch panel 52 and five AI-type array capacitive touch ICs 54, 56, 58, 60 and 62, wherein the sub-touch IC 54 and 56 is on the left of the touch panel 52 , the sub-touch IC 54 is above the sub-touch IC 56 , the sub-touch ICs 58 and 60 are located below the touch panel 52 , and the sub-touch IC 58 is on the left of the sub-touch IC 60 . The X-axis and Y-axis of the touch panel 52 each have 40 sensing lines TRX1-TRX40 and TRY1-TRY40. The sub-touch IC58 scans from the sensing line TRX1 to the sensing line TRX20, and the sub-touch IC60 starts from the sensing line TRX20 or TRX21. Scanning to the sensing line TRX40, the auxiliary touch IC56 scans from the sensing line TRY1 to the sensing line TRY20, the auxiliary touch IC54 scans from the sensing line TRY20 or TRY21 to the sensing line TRY40, the main touch IC62 does not participate in the scanning work, it is only responsible for Control the overall operation, receive data, perform the final calculation and communicate with the outside, the main touch IC62 sends the clock CLK to the sub-touch IC54, 56, 58 and 60, and uses the address signal AD to select the sub-touch IC54, 56, 58 and 60, the secondary touch IC54, 56, 58 and 60 transmit the scanned data SDA obtained after scanning to the main touch IC62, and the main touch IC62 performs final The operation is performed to determine the position of the object on the touch panel 52 . In addition to scanning, the sub-touch ICs 54 , 56 , 58 and 60 can also add some calculations to reduce the load of the main touch IC 62 . Since the sub-touch ICs 54 , 56 , 58 and 60 can scan simultaneously and each is only responsible for scanning part of the sensing lines, the imaging speed can be effectively improved. In other embodiments, the AI-type array capacitive touch IC 62 may also be replaced by other ICs with computing functions.

FIG. 7 shows a fifth embodiment of the present invention. A capacitive touch device 70 includes a large-size touch panel 72 and five AI-type array capacitive touch ICs 74, 76, 78, 80 and 82, wherein the sub-touch IC 74 and 76 is located at the upper right of the touch panel 72, the auxiliary touch IC74 is at the upper right of the auxiliary touch IC76, the auxiliary touch IC78 and 80 are located at the lower left of the touch panel 72, and the auxiliary touch IC78 is at the upper right of the auxiliary touch IC80 . The X-axis and Y-axis of the touch panel 72 each have 40 sensing lines TRX1-TRX40 and TRY1-TRY40, the sub-touch IC78 scans the sensing lines TRX1-TRX10 and TRY1-TRY10, and the sub-touch IC80 scans the sensing lines TRX11-TRX20 and TRY11~TRY20, auxiliary touch IC74 scanning sensing lines TRX21~TRX30 and TRY21~TRY30, auxiliary touch IC76 scanning sensing lines TRX31~TRX40 and TRY31~TRY40, main touch IC82 does not participate in the scanning work, it is only responsible for controlling the overall operation, Receive data, perform final calculation and communicate with the outside, the main touch IC82 sends the clock CLK to the sub-touch IC74, 76, 78 and 80, and uses the address signal AD to select the sub-touch IC74, 76, 78 and 80, the sub-touch The touch ICs 74 , 76 , 78 and 80 transmit the scanned data SDA obtained after scanning to the main touch IC 82 for final calculation. In addition to scanning, the sub-touch ICs 74 , 76 , 78 and 80 can also add some calculations to reduce the load of the main touch IC 82 . Since the auxiliary touch ICs 74 , 76 , 78 and 80 can scan simultaneously and each is only responsible for scanning part of the sensing lines, the imaging speed can be effectively improved. In other embodiments, the AI-type array capacitive touch IC 82 may also be replaced by other ICs with computing functions.

FIG. 8 shows a sixth embodiment of the present invention. A capacitive touch device 90 includes a large-size touch panel 92 and five AI-type array capacitive touch ICs 94, 96, 98, 100 and 102, wherein the sub-touch IC94, 96, 98 and 100 are all located at the bottom left of the touch panel 92, the sub-touch IC94 is at the top right of the sub-touch IC96, the sub-touch IC96 is at the top right of the sub-touch IC98, and the sub-touch IC98 is at the top right of the sub-touch IC100 to the upper right of the . The X-axis and Y-axis of the touch panel 92 each have 40 sensing lines TRX1-TRX40 and TRY1-TRY40, the sub-touch IC94 scans the sensing lines TRX1-TRX10 and TRY1-TRY10, and the sub-touch IC96 scans the sensing lines TRX11-TRX20 and TRY11~TRY20, auxiliary touch IC98 scanning sensing lines TRX21~TRX30 and TRY21~TRY30, auxiliary touch IC100 scanning sensing lines TRX31~TRX40 and TRY31~TRY40, main touch IC102 does not participate in the scanning work, it is only responsible for controlling the overall operation, Receive data, carry out the final calculation and communicate with the outside, the main touch IC102 sends the clock CLK to the sub-touch IC94, 96, 98 and 100, and uses the address signal AD to select the sub-touch IC94, 96, 98 and 100, the sub-touch The touch ICs 94 , 96 , 98 and 100 transmit the scanned data SDA obtained after scanning to the main touch IC 102 for final calculation. In addition to scanning, the sub-touch ICs 94 , 96 , 98 and 100 may also add part of calculations to reduce the load of the main touch IC 102 . Since the auxiliary touch ICs 94 , 96 , 98 and 100 can scan at the same time and each is only responsible for scanning part of the sensing lines, the imaging speed can be effectively improved. In other embodiments, the AI-type array capacitive touch IC 102 may also be replaced by other ICs with computing functions.

FIG. 9 shows a seventh embodiment of the present invention. A capacitive touch device 110 includes a large-size touch panel 112 and five AI-type array capacitive touch ICs 114, 116, 118, 120, and 122, wherein the sub-touch IC 114 and 116 is located at the bottom left of the touch panel 112 , the sub-touch IC 114 is at the bottom left of the sub-touch IC 116 , the sub-touch ICs 118 and 120 are located at the bottom right of the touch panel 112 , and the sub-touch IC 118 is at the top left of the sub-touch IC 120 . The X-axis and Y-axis of the touch panel 112 respectively have 40 sensing lines TRX1-TRX40 and TRY1-TRY40, the sub-touch IC116 scans the sensing lines TRX1-TRX10 and TRY1-TRY10, and the sub-touch IC114 scans the sensing lines TRX11-TRX20 and TRY11~TRY20, auxiliary touch IC120 scanning sensing lines TRX21~TRX30 and TRY31~TRY40, auxiliary touch IC118 scanning sensing lines TRX31~TRX40 and TRY21~TRY30, main touch IC122 does not participate in the scanning work, it is only responsible for controlling the overall operation, Receive data, carry out the final operation and communicate with the outside, the main touch IC122 sends the clock pulse CLK to the sub-touch IC114, 116, 118 and 120, and uses the address signal AD to select the sub-touch IC114, 116, 118 and 120, the sub-touch IC114, 116, 118 and 120, the sub-touch The touch ICs 114 , 116 , 118 and 120 transmit the scanned data SDA obtained after scanning to the main touch IC 122 for final calculation. In addition to scanning, the auxiliary touch ICs 114 , 116 , 118 and 120 may also add part of calculations to reduce the load of the main touch IC 122 . Since the sub-touch ICs 114 , 116 , 118 and 120 can scan simultaneously and each is only responsible for scanning a part of the sensing lines, the imaging speed can be effectively improved. In other embodiments, the AI-type array capacitive touch IC 122 may also be replaced by other ICs with computing functions.

Figures 6 to 9 show four different layouts. As the position of the sub-touch IC changes, the length of the trace between the sensing line and the sub-touch IC will also change, which will affect the capacitive touch sensor. In addition, in Figures 5 to 9, since the main control ICs 48, 62, 82, 102, and 112 are not responsible for scanning the panel, it is not necessary to use a capacitive touch IC, and a general IC can also be used instead . Furthermore, in FIG. 3 to FIG. 9 , other array capacitive touch ICs may also be used to replace the AI-type array capacitive touch IC, for example, an APA-type array capacitive touch IC.

Claims (20)

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

One contact panel;

At least one first integrated circuit; And

One second integrated circuit, with the described contact panel of described at least one first IC scanning, described second integrated circuit receives scan-data from described at least one first integrated circuit to carry out computing.

2. capacitive touch device as claimed in claim 1 is characterized in that, described at least one first integrated circuit comprises shaft staggered type array capacitor formula touch-control integrated circuit.

3. capacitive touch device as claimed in claim 1 is characterized in that, described at least one first integrated circuit carries out computing to produce described scan-data with the result of each self-scanning.

4. capacitive touch device as claimed in claim 1 is characterized in that, described second integrated circuit comprises shaft staggered type array capacitor formula touch-control integrated circuit.

5. capacitive touch device as claimed in claim 1 is characterized in that described second integrated circuit is controlled the overall operation of described capacitive touch device.

6. capacitive touch device as claimed in claim 1 is characterized in that, described second integrated circuit is responsible for and external communication.

7. the control method of a capacitive touch device, described capacitive touch device comprises a contact panel, it is characterized in that, and described control method comprises the following steps:

With at least one first integrated circuit and the described contact panel of one second IC scanning;

The scan-data that obtains behind described at least one first IC scanning is sent to described second integrated circuit; And

Result by the described described scan-data of the second integrated circuit computing and self scanning is to judge the position of object on described contact panel.

8. control method as claimed in claim 7 is characterized in that, described control method comprises that also the result by described at least one first each self-scanning of integrated circuit computing produces described scan-data.

9. control method as claimed in claim 7 is characterized in that, described control method also comprises via described second integrated circuit and external communication.

10. control method as claimed in claim 7 is characterized in that, described control method also comprises utilizes described second integrated circuit to control the overall operation of described capacitive touch device.

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

One contact panel;

A plurality of first integrated circuit are in order to scan described contact panel; And

One second integrated circuit receives a plurality of scan-datas from described a plurality of first integrated circuit to carry out computing.

12. capacitive touch device as claimed in claim 11 is characterized in that, described a plurality of first integrated circuit comprise shaft staggered type array capacitor formula touch-control integrated circuit.

13. capacitive touch device as claimed in claim 11 is characterized in that, described a plurality of first integrated circuit carry out computing to produce described a plurality of scan-data with the result of each self-scanning.

14. capacitive touch device as claimed in claim 11 is characterized in that, described second integrated circuit comprises shaft staggered type array capacitor formula touch-control integrated circuit.

15. capacitive touch device as claimed in claim 11 is characterized in that, described second integrated circuit is controlled the overall operation of described capacitive touch device.

16. capacitive touch device as claimed in claim 11 is characterized in that, described second integrated circuit is responsible for and external communication.

17. the control method of a capacitive touch device, described capacitive touch device comprises a contact panel, it is characterized in that, described control method comprises the following steps:

Produce a plurality of scan-datas with the described contact panel of a plurality of first IC scannings;

Described a plurality of scan-datas are sent to one second integrated circuit; And

By the position of the described a plurality of scan-datas of the described second integrated circuit computing with judgement object on described contact panel.

18. control method as claimed in claim 17 is characterized in that, the step that produces described a plurality of scan-datas comprises that the result by described a plurality of first each self-scanning of integrated circuit computing produces described a plurality of scan-data.

19. control method as claimed in claim 17 is characterized in that, described control method also comprises via described second integrated circuit and external communication.

20. control method as claimed in claim 17 is characterized in that, described control method also comprises utilizes described second integrated circuit to control the overall operation of described capacitive touch device.

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