CN112764577A - Touch sensing device and sensing method thereof - Google Patents
Touch sensing device and sensing method thereof Download PDFInfo
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- CN112764577A CN112764577A CN202110038373.8A CN202110038373A CN112764577A CN 112764577 A CN112764577 A CN 112764577A CN 202110038373 A CN202110038373 A CN 202110038373A CN 112764577 A CN112764577 A CN 112764577A
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- 238000001514 detection method Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 4
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- 230000004044 response Effects 0.000 description 5
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03547—Touch pads, in which fingers can move on a surface
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Abstract
The invention provides a touch sensing device capable of improving noise value sensing accuracy and a sensing method thereof. The touch sensing device comprises a driving voltage selector, a reference voltage selector, a voltage detection circuit and a controller. The driving voltage selector sequentially provides a plurality of different driving voltages to charge the touch panel during the noise sensing period to respectively generate a plurality of charging voltages. The reference voltage selector corresponds to the driving voltage during the noise sensing period to respectively and sequentially provide a plurality of different reference voltages. The voltage detection circuit sequentially compares the charging voltages with corresponding reference voltages respectively during the noise sensing period to generate a plurality of sensing results. The controller sets a touch sensing strategy according to the sensing result.
Description
Technical Field
The present invention relates to a touch sensing device and a sensing method thereof, and more particularly, to a touch sensing device and a sensing method thereof capable of improving the sensing accuracy of a noise value.
Background
In the conventional electronic devices, in order to improve a more convenient man-machine interface, the touch sensing device becomes a necessary component of the electronic device.
In the prior art, to eliminate the interference caused by the external noise, a single driving voltage is applied to the touch panel of the touch sensing device, and a single reference voltage identical to the driving voltage is applied. When external noise enters the system control sensing device, the difference between the voltage on the touch panel and the reference voltage can be known through comparison.
However, in the prior art, in the system of the electronic device, different data paths (data paths) will bring different frequency responses, and the difference of the frequency responses will cause an error in the sensed voltage difference, which results in an error in the determination of the noise value sensing.
Disclosure of Invention
The invention aims at a touch sensing device and a sensing method thereof, which can more accurately estimate a noise value and optimize a touch detection result.
According to an embodiment of the present invention, a touch sensing apparatus includes a driving voltage selector, a reference voltage selector, a voltage detection circuit, and a controller. The driving voltage selector sequentially provides a plurality of different driving voltages to charge the touch panel during the noise sensing period to respectively generate a plurality of charging voltages. The reference voltage selector corresponds to the driving voltage during the noise sensing period to respectively and sequentially provide a plurality of different reference voltages. The voltage detection circuit is coupled to the touch panel, and sequentially compares the charging voltages with corresponding reference voltages respectively during the noise sensing period to generate a plurality of sensing results. The controller is coupled to the voltage detection circuit and sets a touch sensing strategy according to the sensing result.
According to an embodiment of the present invention, a touch sensing method includes: sequentially providing a plurality of different driving voltages during the noise sensing period to charge the touch panel to respectively generate a plurality of charging voltages; providing a plurality of different reference voltages in sequence corresponding to the driving voltage during the noise sensing period; sequentially comparing the charging voltages with corresponding reference voltages respectively during a noise sensing period to generate a plurality of sensing results; and setting a touch sensing strategy according to the sensing result.
According to the above, in the noise sensing period, the touch sensing device of the invention performs the test operation of the noise value by using a plurality of different driving voltages, so that the noise from different data paths (data paths) can be fully displayed. The touch sensing device further formulates a touch sensing strategy according to sensing results obtained by corresponding to different driving voltages, so that the accuracy of the measurement and control action can be optimized, and the efficiency of the touch sensing device is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of a touch sensing device according to an embodiment of the invention;
FIG. 2 is a flowchart illustrating operations of the touch sensing device during a noise sensing period according to an embodiment of the present invention;
FIG. 3A and FIG. 3B are waveform diagrams of noise sensing operations of the touch sensing device according to various embodiments of the present invention;
FIG. 4 is a schematic circuit diagram of a touch sensing device according to another embodiment of the invention;
fig. 5 is a flowchart illustrating a touch sensing method of a touch sensing device according to an embodiment of the invention.
Description of the reference numerals
100. 400: a touch sensing device;
110. 410: a drive voltage selector;
120. 420: a reference voltage selector;
130. 430: a voltage detection circuit;
140: a controller;
cint: a capacitor;
CTR1, CTR 2: a control signal;
NLC 1-NLC 3, NLCN: a time interval;
OP: an operational amplifier;
QVC: sensing the result;
s210 to S270: a noise sensing step;
s510 to S540: a touch sensing step;
SC1, SCN: capacitive sensing time
SW 11-SW 1N, SW 21-SW 2N, SW 3: a switch;
SX: a touch panel;
V1-VN: a voltage to be selected;
VCP: a charging voltage;
VDRV: a drive voltage;
VREF: a reference voltage.
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a touch sensing device according to an embodiment of the invention. The touch sensing device 100 includes a driving voltage selector 110, a reference voltage selector 120, a voltage detection circuit 130, and a controller 140. The driving voltage selector 110 is coupled to the touch panel SX. The driving voltage selector 110 receives a plurality of candidate voltages V1 to VN, sequentially selects the respective candidate voltages V1 to VN during noise sensing to provide different plurality of driving voltages VDRV to the touch panel SX, and generates a plurality of charging voltages VCP by charging the touch panel SX, respectively. The reference voltage selector 120 is coupled to the voltage detection circuit 130 and receives the voltages V1-VN to be selected. The reference voltage selector 120 sequentially provides a plurality of different reference voltages VREF to the voltage detection circuit 130 corresponding to the driving voltages VDRV provided by the driving voltage selector 110 during the noise sensing period. In the present embodiment, the voltage levels of any two of the candidate voltages V1 to VN are different.
In the present embodiment, during the noise sensing period, the voltage detection circuit 130 sequentially compares the charging voltage VCP with the corresponding reference voltage VREF, and generates a plurality of sensing results QVC, respectively. The voltage detection circuit 130 is coupled to the controller 140 and transmits the sensing result QVC to the controller 140. The controller 140 can also set a touch sensing strategy of the touch sensing apparatus 100 according to the received sensing results QVC.
It should be noted that, in the present embodiment, the touch sensing device 100 executes the sensing operation of the noise value by sequentially passing the driving voltage VDRV of different voltage levels in time division in cooperation with the reference voltage VREF corresponding to the driving voltage VDRV. In an integrated circuit, voltages of different levels reach target voltages through different data paths (data paths) during the operation of the chip. Different data paths also represent different rc loading effects, so that when an external voltage difference is introduced into an Analog Front End (AFE) circuit of the voltage detection circuit 130, different frequency responses are generated.
The voltage detection circuit 130 may reflect the frequency response by correspondingly generating a plurality of sensing results QVC. The controller 140 can collect a sufficient amount of the sensing result QVC and set the touch sensing strategy of the touch sensing device 100 according to the sensing result QVC.
In the touch sensing strategy established by the controller 140, a frequency hopping (frequency hopping) operation of an operating frequency, an adjustment of the number of sensing sampling points, or an adjustment of the number of parameters switched to a noise mode may be performed in the touch sensing operation according to the state of the noise value of the touch sensing apparatus 100 corresponding to different driving voltages VDRV. For example, the controller 140 can select an operating frequency with a relatively low noise value according to the sensing result QVC to operate the touch sensing apparatus 100. The controller 140 can also reduce the influence of noise on the touch sensing device 100 by adjusting the software algorithm through mechanisms such as a software filter and de-bouncing.
In the present embodiment, during the noise sensing period, the driving voltage VDRV and the reference voltage VREF provided by the driving voltage selector 110 and the reference voltage selector 120 at the same time point may be the same. That is, for this time point, under the condition of no noise interference, the voltage detection circuit 130 may compare the driving voltage VDRV and the reference voltage VREF and should generate the sensing result QVC of 0. However, in actual operation, a certain noise value may be carried on the driving voltage VDRV and/or the reference voltage VREF, and the voltage detection circuit 130 may sense the noise value by comparing the driving voltage VDRV and the reference voltage VREF to generate the sensing result QVC accordingly.
In the embodiment, in terms of hardware architecture, the driving voltage selector 110 may be a voltage selector, and sequentially selects one of the voltages V1-VN to be selected to generate the driving voltage VDRV according to the control signal during the noise sensing period. The reference voltage selector 120 may be another voltage selector, and sequentially selects one of the voltages V1 VN to be selected to generate the reference voltage VREF according to the control signal during the noise sensing period. The voltage detection circuit 130 may be constructed by a differential amplifier. The controller 140 may be a processor with computing capabilities. Alternatively, the controller 140 may be a Hardware Circuit designed by Hardware Description Language (HDL) or any other digital Circuit design known to those skilled in the art, and implemented by Field Programmable Gate Array (FPGA), Complex Programmable Logic Device (CPLD) or Application-specific Integrated Circuit (ASIC).
Referring to fig. 2, fig. 2 is a flowchart illustrating an operation of the touch sensing device during a noise sensing period according to an embodiment of the invention. In step S210, the touch sensing device may set a search order, where the search order has n elements, n is a positive integer greater than 1, and the search order [ n ] = { V1, V2, …, VN }, where V1 to VN correspond to a plurality of voltages to be selected, and initialize the index value i to-1. Next, in step S220, the touch sensing device increments the index value i by 1, and in step S230, the touch sensing device sets the driving voltage and the reference voltage to the search sequence [ i ]. That is, when i is 0, the driving voltage and the reference voltage may be equal to V1; when i is 1, the driving voltage and the reference voltage may be equal to V2, and so on.
In step S240, the touch sensing device performs a sensing operation, and obtains a sensing result in step S250.
Next, in step S260, the touch sensing device may determine whether i is smaller than n, and if yes, it indicates that the noise sensing operation is not completed, the method may return to step S220 to continue to perform the noise sensing operation. On the contrary, when the determination result is negative, it indicates that the noise sensing operation is completed. The touch sensing device may set a touch sensing strategy according to the obtained sensing result through the controller (step S270).
Incidentally, the voltages V1 to VN to be selected may be arranged in ascending order or descending order according to the voltage level, or may not be arbitrarily arranged according to the voltage level, and there is no fixed limit.
In this embodiment, the operations of steps S210 to S270 can be performed by a controller in the touch sensing device. The lookup sequence may be recorded in a lookup table, which may be stored in any form of memory accessible by the controller.
Referring to fig. 3A and 3B, fig. 3A and 3B are operation waveform diagrams of different embodiments of noise sensing operations of a touch sensing device according to different embodiments of the invention. In fig. 3A, the noise sensing operation of the touch sensing device can be performed by continuously changing the voltage levels of the driving voltage and the reference voltage. In the first time interval NLC1, the touch sensing device can make the driving voltage and the reference voltage equal to the candidate voltage V1; in the next second time interval NLC2, the touch sensing device can make the driving voltage and the reference voltage equal to the candidate voltage V2; and in the following third time interval NLC3, the touch sensing device can make the driving voltage and the reference voltage equal to the candidate voltage V3. Wherein the first to third time intervals NLC1 to NLC3 may occur continuously.
In addition, in fig. 3B, the touch sensing device can make the driving voltage and the reference voltage equal to the relatively low candidate voltage V1 in the first time interval NLC1, and perform the noise sensing operation. Then, in the capacitance sensing time SC1 after the first time interval NLC1, the touch sensing apparatus can perform a normal touch sensing operation and sense the touched state of the touch panel by sensing a change in capacitance value on the touch panel. The touch sensing device can make the driving voltage and the reference voltage equal to the high voltage VN to be selected in the subsequent nth time interval NLCN, and perform the noise sensing operation. In the capacitance sensing time SCN after the nth time interval NLCN, the normal touch sensing operation can be performed as well.
In fig. 3B, the noise sensing actions corresponding to the multiple candidate voltages V1-VN can be performed separately in different frame periods (frame period).
Referring to fig. 4, fig. 4 is a schematic circuit architecture diagram of a touch sensing device according to another embodiment of the invention. The touch sensing device 400 includes a driving voltage selector 410, a reference voltage selector 420, and a voltage detection circuit 430. The driving voltage selector 410 includes a plurality of switches SW11 to SW 1N. First ends of the switches SW11 to SW1N respectively receive a plurality of voltages V1 to VN to be selected, and second ends of the switches SW11 to SW1N are commonly coupled to the touch panel SX and to the voltage detection circuit 430. The reference voltage selector 420 includes a plurality of switches SW 21-SW 2N. The first terminals of the switches SW 21-SW 2N respectively receive the voltages V1-VN to be selected, and the second terminals of the switches SW 21-SW 2N are commonly coupled to the voltage detection circuit 430. The driving voltage selector 410 and the reference voltage selector 420 operate according to the control signals CTR1 and CTR2, respectively, wherein at most one of the switches SW11 to SW1N can be turned on according to the control signal CTR1, and at most one of the switches SW21 to SW2N can be turned on according to the control signal CTR 2. During the noise sensing period, the driving voltage selector 410 and the reference voltage selector 420 can select the same voltage to be selected V1-VN to be used as the driving voltage VDRV and the reference voltage VREF, respectively.
On the other hand, the voltage detection circuit 430 includes a switch SW3, an operational amplifier OP, and a capacitor Cint. The operational amplifier OP has a negative input terminal coupled to the switch SW3, and can receive the charging voltage VCP through the switch SW 3. The positive input terminal of the operational amplifier OP receives a reference voltage VREF. The output of the operational amplifier OP generates the sensing result QVC. The capacitor Cint is coupled in series between the output terminal of the operational amplifier OP and the negative input terminal of the operational amplifier OP.
In the operation details, the driving voltage selector 410 may select one of the candidate voltages V1-VN (e.g., the candidate voltage V1) as the driving voltage VDRV at a first time, and cause the driving voltage VDRV to charge the touch panel SX, and generate the charging voltage VCP. The reference voltage selector 420 may select one of the candidate voltages V1-VN (the candidate voltage V1) as the reference voltage VREF corresponding to the first time. At the same time, switch SW3 is opened.
Then, in a second time after the first time, the switch SW3 is turned on, and the switches SW11 to SW1N are all turned off. At this time, the driving voltage selector 410 stops supplying the driving voltage VDRV. The voltage detection circuit 430 may generate the sensing result QVC according to the charging voltage VCP on the comparison touch panel SX and the reference voltage VREF.
In addition, the touch sensing apparatus 400 can perform a self-capacitance sensing operation. In the capacitance sensing operation, when the driving voltage selector 410 selects the relatively high voltage to-be-selected voltages V1 VN as the driving voltage VDRV, the reference voltage selector 420 may select the relatively low voltage to-be-selected voltages V1 VN as the reference voltage VREF. The operation timing of the touch sensing device 400 in the capacitance sensing operation is the same as the operation timing in the noise sensing operation, which is not repeated herein.
In this embodiment, the control signals CTR1 and CTR2 can be generated by a controller in the touch sensing device 400. The details of the implementation of the controller are described in detail in the embodiment of fig. 1, and are not repeated herein.
Referring to fig. 5, fig. 5 is a flowchart illustrating a touch sensing method of a touch sensing device according to an embodiment of the invention. In step S510, sequentially providing a plurality of different driving voltages to charge the touch panel during the noise sensing period to generate a plurality of charging voltages, respectively; in step S520, a plurality of different selection voltages are sequentially provided according to the driving voltage during the noise sensing period; in step S530, the charging voltages are sequentially compared with the corresponding reference voltages during the noise sensing period to generate a plurality of sensing results; in step S540, a touch sensing strategy is set according to the sensing result.
Details of the implementation of the above steps S510 to S540 have been described in detail in the above embodiments and implementations, and are not repeated herein.
In summary, in the touch sensing apparatus of the present invention, during the noise sensing period, the touch panel is charged by providing a plurality of different driving voltages, and different reference voltages are provided corresponding to the driving voltages, so as to compare the charging voltages on the touch panel respectively and obtain the sensing result. Based on the sequentially generated driving voltages respectively having a plurality of different voltage criteria, the frequency responses of a plurality of data paths in a system to which the touch sensing device belongs can be presented in the sensing result. Therefore, the touch sensing strategy formulated according to the sensing result can be optimized, and the touch sensing accuracy is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (16)
1. A touch sensing device, comprising:
a driving voltage selector for sequentially providing a plurality of different driving voltages to charge the touch panel during the noise sensing period to generate a plurality of charging voltages, respectively;
a reference voltage selector for sequentially providing a plurality of different reference voltages corresponding to the plurality of driving voltages during the noise sensing period;
a voltage detection circuit, coupled to the touch panel, for sequentially comparing the plurality of charging voltages with the corresponding plurality of reference voltages during the noise sensing period to generate a plurality of sensing results; and
and the controller is coupled with the voltage detection circuit and is used for setting a touch sensing strategy according to the sensing results.
2. The touch sensing device of claim 1, wherein the driving voltage selector is configured to provide the driving voltages to charge the touch panel to generate the charging voltages respectively at first times during the noise sensing period, and the voltage detection circuit is configured to compare the charging voltages with the reference voltages respectively at second times during the noise sensing period to generate the sensing results.
3. The touch sensing device of claim 2, wherein each of the first times is non-overlapping with a corresponding one of the second times.
4. The touch sensing device of claim 2, wherein the drive voltage selector comprises:
the first switches are respectively provided with a plurality of first ends for respectively receiving a plurality of voltages to be selected, a plurality of second ends of the first switches are commonly coupled to the voltage detection circuit, and the switches are respectively switched on or off according to a plurality of first control signals.
5. The touch sensing device of claim 4, wherein the reference voltage selector comprises:
the second switches are respectively provided with a plurality of first ends for respectively receiving the voltages to be selected, a plurality of second ends of the second switches are commonly coupled to the voltage detection circuit, and the switches are respectively switched on or off according to a plurality of second control signals.
6. The touch sensing device of claim 5, wherein at most one of the first switches is turned on and at most one of the second switches is turned on.
7. The touch sensing device of claim 5, wherein the controller is configured to generate the first control signals and the second control signals.
8. The touch sensing device of claim 4, wherein the voltage detection circuit comprises:
an operational amplifier having a negative input terminal for receiving each of the charging voltages, a positive input terminal of the operational amplifier receiving each of the reference voltages, an output terminal of the operational amplifier generating the sensing result;
a capacitor coupled in series between the output terminal of the operational amplifier and the negative input terminal of the operational amplifier; and
and the third switch is coupled between the negative input end of the operational amplifier and the touch plate in series.
9. The touch sensing device of claim 8, wherein the third switch is turned off at the first times and turned on at the second times.
10. The touch sensing device according to claim 2, wherein each of the driving voltages and each of the reference voltages are the same in each of the first times, and a voltage level of each of the reference voltages is maintained constant in each of the first times and each of the second times.
11. The touch sensing device according to claim 1, wherein during the noise sensing period, the controller determines a providing sequence of the driving voltages and the reference voltages according to a search sequence, wherein the search sequence is recorded in a search table.
12. A touch sensing method, comprising:
sequentially providing a plurality of different driving voltages during the noise sensing period to charge the touch panel to respectively generate a plurality of charging voltages;
respectively providing a plurality of different reference voltages in sequence corresponding to the plurality of driving voltages during the noise sensing period;
sequentially comparing the plurality of charging voltages with the corresponding plurality of reference voltages respectively during the noise sensing period to generate a plurality of sensing results; and
and setting a touch sensing strategy according to the sensing results.
13. The touch sensing method of claim 12, wherein sequentially providing different driving voltages to charge the touch panel during the noise sensing to generate charging voltages respectively comprises:
providing the plurality of driving voltages to charge the touch panel to generate the plurality of charging voltages, respectively, at a plurality of first times during the noise sensing period, respectively;
wherein sequentially comparing the plurality of charging voltages with the corresponding plurality of reference voltages to generate the plurality of sensing results during the noise sensing comprises:
in a plurality of second times during the noise sensing, the plurality of charging voltages are respectively compared with the corresponding plurality of reference voltages to generate the plurality of sensing results.
14. The touch sensing method according to claim 13, wherein each of the first times is not overlapped with the corresponding second time.
15. The touch sensing method according to claim 14, wherein in each of the first times, the corresponding driving voltages and the corresponding reference voltages are the same, and a voltage level of each of the reference voltages is maintained constant in each of the first times and the corresponding second times.
16. The touch sensing method according to claim 12, wherein during the noise sensing period, a providing sequence of the driving voltages and the reference voltages is determined according to a searching sequence recorded in a lookup table.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499486A (en) * | 2021-09-06 | 2022-05-13 | 上海芯圣电子股份有限公司 | Anti-noise touch key integrated circuit |
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