CN101561730A - Power-saving capacitance touch control device and method thereof - Google Patents
Power-saving capacitance touch control device and method thereof Download PDFInfo
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- CN101561730A CN101561730A CNA2008100910675A CN200810091067A CN101561730A CN 101561730 A CN101561730 A CN 101561730A CN A2008100910675 A CNA2008100910675 A CN A2008100910675A CN 200810091067 A CN200810091067 A CN 200810091067A CN 101561730 A CN101561730 A CN 101561730A
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Abstract
The invention relates to a power-saving capacitance touch control device and a method thereof. The capacitance touch control device comprises a plurality of integrated circuits for scanning a touch control panel, and each integrated circuit is responsible for one scanning area; and when an object does not enter one or more responsible scanning areas in the integrated circuits, the one or more integrated circuits can be in a park mode to reduce the scanning frequency, thereby saving the power.
Description
Technical field
The present invention is relevant a kind of capacitive touch device, particularly about a kind of capacitive touch device and method thereof of saving power consumption.
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.
(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 IC 12 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
The objective of the invention is to propose a kind of capacitive touch device and method thereof of saving power consumption.
According to the present invention, a kind of capacitive touch device of saving power consumption comprises an IC scanning one contact panel and the one second integrated circuit computing scan-data from described first integrated circuit, when wherein said first integrated circuit does not detect object and enters its scanning area of being responsible in a Preset Time, enter park mode to save power consumption.Described second integrated circuit also can participate in scanning the work of described contact panel.
The invention provides a kind of method of saving the capacitive touch device power consumption, described capacitive touch device comprises its scanning area of being responsible in a contact panel, the described contact panel of one first IC scanning and the one second integrated circuit computing scan-data from described first integrated circuit, described method comprises the following steps: to scan described scanning area with a high-frequency when detecting object and enter described scanning area; And when in a Preset Time, not detecting object and entering described scanning area, scan described scanning area with a low frequency.
Beneficial effect of the present invention is, when object does not enter some or certain some scanning area of being responsible in described a plurality of integrated circuit for a long time, described some or certain some integrated circuit will enter park mode reducing the frequency of scanning, and then save power consumption.
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;
Fig. 4 shows the embodiment that the adding park mode descends overall power consumption; And
Fig. 5 passes to the signal SDA[M-1:0 of main touch-control IC for secondary touch-control IC under the normal conditions] sequential chart.
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
40 capacitive touch devices, 42 touch-control IC
44 touch-control IC, 46 touch-control IC
48 touch-control IC, 50 touch-control IC
52 touch-control IC, 54 touch-control IC
60 signal SDA[M-1:0] the waveform of waveform 62 time clock CLK
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 IC32 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.
Because the area of finger touches contact panel 22 is very little with respect to large touch panel 22, and under most application, most time is all only touched operation in some zone, therefore most secondary touch-control IC 24,26,28 and 30 can enter park mode (suspendmode) in order to power saving in most of the time, for example, when finger does not enter certain secondary touch-control IC 24 for a long time, 26,28 and 30 be responsible for scanning area the time, described secondary touch-control IC 24,26,28 and 30 promptly enter park mode, secondary touch-control IC 24,26,28 and 30 scanning areas that after entering park mode, will be responsible for than long time ability run-down at interval, for example, secondary touch-control IC 24,26,28 and 30 under normal mode about 4ms run-down, secondary touch-control IC 24 after entering park mode, 26,28 and 30 about 40ms run-downs.
Fig. 4 shows the embodiment that the adding park mode descends overall power consumption, in capacitive touch device 40, uses 2
NAI type array capacitor formula touch-control IC 42,44,46,48,50 and 52 produce scan-data as secondary touch-control IC in order to scanning contact panel (not shown), when finger does not enter certain secondary touch-control IC 42 for a long time, 44,46,48,50 and 52 be responsible for scanning area the time, described secondary touch-control IC 42,44,46,48,50 and 52 will enter park mode to reduce sweep frequency, and then saving power consumption, main touch-control IC 54 output time clock CLK give each secondary touch-control IC 42,44,46,48,50 and 52, and read secondary touch-control IC 42,44,46,48, scan-data in 50 and 52 is to carry out computing, because secondary touch-control IC 42 in this embodiment, 44,46,48,50 and 52 respectively comprise pin PN[M-1:0] in order to send the signal SDA[M-1:0 that comprises scan-data] to main touch-control IC 54, and secondary touch-control IC 42,44,46,48,50 and 52 pin PN[M-1:0] be to link together and be connected to main touch-control IC 54, so for fear of each secondary touch-control IC 52,54,56 and 58 data interact, main touch-control IC 54 sends address signal Addr[N-1:0] to each secondary touch-control IC 42,44,46,48,50 and 52 to determine to want the secondary touch-control IC of output scanning data, for example, as present pin Addr[N-1:0] when being 0, expression transmits scan-data by secondary touch-control IC 42 and gives main touch-control IC 54, this moment remaining secondary touch-control IC44,46,48, the PN[M-1:0 of 50 and 52 pins] all be in high impedance or floating, in addition, main touch-control IC 54 is output signal Typesel[K-1:0 also] to secondary touch-control IC 42,44,46,48,50 and 52 to select data layout, pull down resistor R
PLBe connected each pin PN[M-1:0 of secondary touch-control IC 42,44,46,48,50 and 52] and ground end GND between.
When main touch-control IC 54 desired to read scan-data in secondary touch-control IC 42,44,46,48,50 and 52, secondary touch-control IC 42,44,46,48,50 and 52 will send the password (password) of several sequential earlier as the initial confirmation code of package.Fig. 5 is one (bit) with the transmission data, the situation that is M=1 is an example, secondary touch-control IC passes to main touch-control IC signal SDA[M-1:0 under the normal conditions] sequential chart, wherein waveform 60 is signal SDA[M-1:0], waveform 62 is time clock CLK, in the embodiment of Fig. 5, signal SDA[M-1:0] be 1 and password is 2 sequential, as secondary touch-control IC 42,44,46,48,50 and 52 detect address signal Addr[N-1:0] when pointing to oneself, promptly signal SDA[M-1:0] pull-up, wait for that main touch-control IC 54 sends time clock CLK to change data, and main touch-control IC 54 reading of data when the positive edge of time clock, so under the normal transmission pattern, main touch-control IC 54 will detect signal SDA[M-1:0 earlier] there is elder generation just to begin reading of data for after the initial confirmation code of " 0 " again for " 1 ".When finger does not enter certain secondary touch-control IC 42 for a long time, 44,46,48,50 and 52 be responsible for scanning area the time, described secondary touch-control IC 42,44,46,48,50 and 52 will enter park mode and at interval long time run-down zone of being responsible for, though described secondary touch-control IC 42,44,46,48,50 and 52 enter park mode, but main touch-control IC 54 still is each frame (frame) wants a secondary data, again by as can be known aforementioned, have only as secondary touch-control IC 42,44,46,48,50 and 52 know the address signal Addr[N-1:0 that main touch-control IC 54 is given] when pointing to oneself just with signal SDA[M-1:0] be set at " 0 " or " 1 ", all the other all are in high impedance or floating, therefore as main touch-control IC 54 during to certain secondary touch-control IC requirement data, for example secondary touch-control IC 42, in the time of can't responding if described secondary touch-control IC 42 is in park mode, pull down resistor R
PLCan be with pin PN[M-1:0 this moment] on accurate position draw and be " 0 ", make the touch-control IC of winner 54 detect signal SDA[M-1:0] go up and the initial confirmation code of inaction " 10 ", and then skip secondary touch-control IC 42 and downward secondary touch-control IC 44 requires data return.
Claims (12)
1. a capacitive touch device of saving power consumption is characterized in that, described device comprises:
One contact panel;
One first integrated circuit scans described contact panel; And
One second integrated circuit, computing is from the scan-data of described first integrated circuit;
Wherein, when described first integrated circuit does not detect object and enters its scanning area of being responsible in a Preset Time, enter park mode to reduce the frequency of scanning.
2. capacitive touch device as claimed in claim 1 is characterized in that, described first integrated circuit comprises that at least one pin is in order to export described scan-data.
3. capacitive touch device as claimed in claim 2 is characterized in that, described second integrated circuit comprises that more the accurate position of detecting described at least one pin is to judge whether to read described scan-data.
4. capacitive touch device as claimed in claim 3, it is characterized in that, described capacitive touch device comprises that more a resistance is connected between a described pin and the reference voltage, when being in described second pattern at described first integrated circuit, the accurate position of described pin is pulled to described reference voltage.
5. capacitive touch device as claimed in claim 1 is characterized in that, described first integrated circuit comprises shaft staggered type array capacitor formula touch-control integrated circuit.
6. capacitive touch device as claimed in claim 1 is characterized in that, the data layout of the described scan-data of described first integrated circuit of signal deciding is selected in described second integrated circuit output one.
7. capacitive touch device as claimed in claim 1 is characterized in that, described second integrated circuit comprises that more output one time clock is to described first integrated circuit.
8. capacitive touch device as claimed in claim 1 is characterized in that, described second integrated circuit more comprises the described contact panel of scanning.
9. method of saving the capacitive touch device power consumption, it is characterized in that, described capacitive touch device comprises its scanning area of being responsible in a contact panel, the described contact panel of one first IC scanning and the one second integrated circuit computing scan-data from described first integrated circuit, and described method comprises the following steps:
When detecting object and enter described scanning area, scan described scanning area with a high-frequency; And
When in a Preset Time, not detecting object and entering described scanning area, scan described scanning area with a low frequency.
10. method as claimed in claim 9, it is characterized in that the method for described saving capacitive touch device power consumption more comprises by described first integrated circuit provides a confirmation code to judge whether to read described scan-data for described second integrated circuit.
11. method as claimed in claim 9 is characterized in that, the method for described saving capacitive touch device power consumption more comprises the data layout that determines described scan-data.
12. method as claimed in claim 9 is characterized in that, the method for described saving capacitive touch device power consumption more comprises by described second integrated circuit provides time clock to described first integrated circuit.
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| CN2008100910675A CN101561730B (en) | 2008-04-16 | 2008-04-16 | Power-saving capacitance touch control device and method thereof |
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| CN2008100910675A CN101561730B (en) | 2008-04-16 | 2008-04-16 | Power-saving capacitance touch control device and method thereof |
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| CN101561730B CN101561730B (en) | 2010-12-01 |
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| CN102375630A (en) * | 2010-08-17 | 2012-03-14 | 东莞万士达液晶显示器有限公司 | Surface capacitance type touch control device and control method thereof |
| CN102402353A (en) * | 2010-09-14 | 2012-04-04 | 上海天马微电子有限公司 | Touch scanning method of touch screen |
| CN101901070B (en) * | 2010-02-09 | 2012-04-18 | 华映视讯（吴江）有限公司 | Touch device and driving method for touch panel thereof |
| WO2012062062A1 (en) * | 2010-11-13 | 2012-05-18 | Tpk Touch Solutions (Xiamen) Inc. | Touch device for determining real coordinates of multiple touch points and method thereof |
| CN102478953A (en) * | 2010-11-24 | 2012-05-30 | 原相科技股份有限公司 | Touch system and optical touch system with power-saving mechanism |
| CN102566803A (en) * | 2010-12-16 | 2012-07-11 | 北京汇冠新技术股份有限公司 | Touch screen and data processing method thereof |
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