CN116880717B - Capacitance detection device, and method and device for improving detection precision of capacitive touch screen - Google Patents
Capacitance detection device, and method and device for improving detection precision of capacitive touch screen Download PDFInfo
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- CN116880717B CN116880717B CN202311147024.5A CN202311147024A CN116880717B CN 116880717 B CN116880717 B CN 116880717B CN 202311147024 A CN202311147024 A CN 202311147024A CN 116880717 B CN116880717 B CN 116880717B
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- 238000001514 detection method Methods 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims description 54
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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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
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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
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Abstract
The invention discloses a built-in capacitance detection device, a method and a device for improving the detection precision of a capacitive touch screen, wherein the built-in capacitance detection device comprises: an RX input channel, said RX input channel comprising: an RX detection channel and an opening and closing switch SW, wherein a first signal RX_TST is connected to the RX detection channel and one end of the opening and closing switch SW is connected; the variable capacitor is connected to the RX detection channel through the switching-off switch SW; and a second signal VTX, wherein the second signal VTX is connected to the variable capacitor. The built-in capacitance detection device is simple in structure, can detect built-in capacitance in the chip test process, judge the performance of detection channels, store the mismatch value of each channel, improve the detection precision through algorithm compensation, and reduce the application initialization time and complexity of the touch screen module.
Description
Technical Field
The invention relates to the field of touch screen control, in particular to a capacitance detection device, and a method and a device for improving detection precision of a capacitive touch screen.
Background
Capacitive touch sensing is a man-machine interaction mode occupying absolute mainstream position in electronic equipment such as mobile phones, flat plates and wearable watches, and the sensitivity, the accuracy and the anti-interference performance of touch detection of the capacitive touch sensing can directly influence the experience of interaction between a user and the electronic equipment.
Nowadays, a touch detection chip generally applies excitation on a touch screen device, changes a capacitance into a voltage, digitizes the voltage through analog-to-digital conversion, and further judges the touch position according to the size of a signal. The touch screen is provided with a plurality of induction lines connected to the chip receiving channels, and consistency among the receiving channels influences the accuracy of capacitance detection. The circuit in the detection channel inevitably has certain problems of system imbalance and random imbalance due to factors such as design and manufacture, and the reduction of the problems of imbalance often requires complex circuit design and larger chip area, which means that the cost of the chip is increased.
Or after the modules are formed, each receiving channel firstly charges and discharges the same bus capacitor, channel analog quantity such as mismatch of IDAC, current digital-to-analog conversion and the like is deduced according to charge and discharge time, mismatch values are stored, and corresponding mismatch values are compensated in subsequent real capacitor sensing. However, this increases the time for touch detection initialization, and only partial channel analog mismatch can be obtained, but the mismatch of the entire sensing channel cannot be obtained, and for a chip with a large mismatch, the complete compensation cannot be performed, the accuracy of touch detection is not high, and the chip with a large mismatch cannot be screened.
Therefore, it is necessary to provide a built-in capacitance detection device, a method and a device for improving the detection precision of a capacitive touch screen, reduce the manufacturing cost of a chip, reduce the initialization time and complexity of a module, and improve the detection precision of the touch screen.
Disclosure of Invention
The invention aims to provide a built-in capacitance detection device, a method and a device for improving the detection precision of a capacitive touch screen, which reduce the manufacturing cost of a chip, reduce the initialization time and complexity of a module and improve the detection precision of the touch screen.
In order to achieve the above object, the present invention provides a built-in capacitance detection device, comprising:
an RX input channel, said RX input channel comprising: an RX detection channel and an off switch SW, wherein a first signal RX_TST is connected to the RX detection channel through the off switch SW; the variable capacitor is connected to the RX detection channel through the switching-off switch SW; and a second signal VTX, wherein the second signal VTX is connected to the variable capacitor.
Optionally, the method comprises the following steps: the number of the RX input channels is n, n is a natural number greater than 1, the mth RX detection channel is connected with one end of the corresponding mth switching-off switch SW, and the other ends of the n switching-off switches SW are connected with the variable capacitor, wherein 1= < m < = n.
The invention also provides a method for improving the detection precision of the capacitive touch screen, which is based on the built-in capacitance detection device and comprises the following steps:
determining a first capacitance value of the variable capacitor, closing the switching-on/switching-off switch SW, accessing the first signal RX_TST, starting the second signal VTX, and acquiring a measured value RX1 by an RX detection channel;
determining a second capacitance value of the variable capacitor, accessing the first signal RX_TST again, starting the second signal VTX, and acquiring a measured value RX2 by the RX detection channel;
opening the switching-off switch SW, and closing the measurement of the RX detection channel;
calculating a measurement difference RXD of the measurement value RX1 and the measurement value RX2, and obtaining a mismatch value; and if the measured value RX1, the measured value RX2 or the measured difference RXD exceeds a mismatch threshold, judging that the RX detection channel is abnormal.
Optionally, the n RX detection channels sequentially acquire a measurement value RX1 and a measurement value RX2, calculate a measurement difference RXd between the measurement value RX1 and the measurement value RX2, and control the mth RX detection channel to perform measurement through the mth switch SW.
Optionally, if the number of RX detection channels whose measurement difference RXd exceeds the deviation threshold among the n RX detection channels reaches the set threshold, performing program normalization on the n RX detection channels at the software layer.
Optionally, before the obtaining the mismatch value, the method further includes: setting the deviation threshold, the mismatch threshold and the set threshold.
Optionally, the program normalized data is:
。
the invention also provides a device for improving the detection precision of the capacitive touch screen, which comprises: a built-in capacitance detection device; and the measurement screening module is used for detecting the mismatch value of the RX detection channel and judging whether the RX detection channel is abnormal or not.
Optionally, the method further comprises: and the storage module is used for storing measurement data for measuring the RX detection channel.
Optionally, the method further comprises: program setting module: for program normalizing the RX detection channel.
The built-in capacitance detection device is simple in structure, and the manufacturing cost of a chip can be reduced; in addition, in the application of detecting the capacitive touch screen, the mismatch value of each channel can be detected, the built-in capacitance detection can be carried out in the chip test process, the performance of the detected channel is judged, the channel is screened, the mismatch value of each channel is stored, the detection precision is improved through algorithm compensation, and the initialization time and complexity of the module can be reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art built-in capacitance detection device;
FIG. 2 is a schematic diagram of a built-in capacitance detection device according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for improving detection accuracy of a capacitive touch screen according to an embodiment of the present invention.
Detailed Description
The capacitive sensing apparatus, method and apparatus for improving the sensing accuracy of a capacitive touch screen of the present invention will be described in more detail below with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown, it being understood that one skilled in the art can modify the invention described herein while still achieving the advantageous effects of the invention. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the invention.
Example 1
Referring to fig. 2, fig. 2 is a schematic diagram of a built-in capacitor device according to an embodiment of the invention.
The embodiment provides a built-in capacitance detection device, including:
an RX (signal receiving unit) input channel, said RX input channel comprising: an RX detection channel 201 and an off switch SW203, a first signal rx_tst (input signal) 202 being connected to the RX detection channel 201 through the off switch SW 203; a variable capacitor 204, where the variable capacitor 204 is connected to the RX detection channel 201 through the switch SW 203; a second signal VTX (voltage signal) 205, the second signal VTX205 being connected to the variable capacitor 204.
Further, the number of the RX input channels is n, n is a natural number greater than 1, the mth RX detection channel is connected to one end of the corresponding mth switch SW, and the other ends of the n switch SW are all connected to the variable capacitor, where 1= < m < = n. The measured values of the n RX detection channels 201 can be sequentially detected by controlling the turning-off of the n off-on switches SW203, respectively.
In this embodiment, the number of n is 4, and the built-in capacitance detection device includes: 4 RX detection channels 201, RX Channel 0, RX Channel 1, RX Channel 2, and RX Channel 3, respectively; the RX detection channel 201 is connected with 4 switch-off switches SW, where the 4 switch-off switches SW are SW0, SW1, SW2 and SW3 respectively; the 4 first signals rx_tst202 are connected to the RX detection channel 201,4 first signals rx_tst202 through the break switch 203, which are rx_tst0, rx_tst1, rx_tst2 and rx_tst3 respectively; the variable capacitor 204 is connected with 4 RX detection channels 201 through 4 breaking switches SW201 respectively, namely one ends of SW0, SW1, SW2 and SW3 are connected with RX Channel 0, RX Channel 1, RX Channel 2 and RX Channel 3 respectively, and the other ends of SW0, SW1, SW2 and SW3 are connected with the variable capacitor 204; the second signal VTX205 is coupled to the variable capacitance 204.
In other embodiments, the number of RX input channels may be 8, 12, 20, etc.
The built-in capacitance detection device can reduce the module initialization time and complexity, improve the touch accuracy and reduce the requirement of RX detection channels on matching. Fig. 1 shows a capacitance detection device in the prior art, and it is obvious that when there is no built-in capacitance detection device, mismatch between detection channels cannot be estimated and corrected, and deviation or noise is introduced into capacitance detection, which may cause problems of reduced detection accuracy, increased detection time, increased cost, and the like.
Example two
Referring to fig. 3, fig. 3 is a flowchart of a method for improving detection accuracy of a capacitive touch screen according to an embodiment of the invention.
The embodiment provides a method for improving detection precision of a capacitive touch screen, based on the built-in capacitance detection device, comprising the following steps:
step S301: determining a first capacitance value of the variable capacitor, closing an off switch SW, accessing a first signal RX_TST, starting a second signal VTX, and acquiring a measured value RX1 by an RX detection channel;
step S302: determining a second capacitance value of the variable capacitor, accessing the first signal RX_TST again, starting the second signal VTX, and acquiring a measured value RX2 by the RX detection channel;
step S303: opening the switching-off switch SW, and closing the measurement of the RX detection channel;
step S304: calculating a measurement difference RXD of the measurement value RX1 and the measurement value RX2, and obtaining a mismatch value; and if the measured value RX1, the measured value RX2 or the measured difference RXD exceeds a mismatch threshold, judging that the RX detection channel is abnormal.
Specifically, when the number of the RX input channels is a natural number n greater than 1, the n RX detection channels are measured sequentially, and the detected RX detection channels are controlled by the switch SW, for example, after the first RX detection channel is detected, the switch SW connected in series with the first RX detection channel is turned off, and the measurement of the RX detection channels is turned off; the second RX detection channel is then measured by closing the switch SW in series with the second RX detection channel. The detection method can obtain the measured values of all RX detection channels, so as to obtain the mismatch values of all RX detection channels, and the touch screen detection module is compensated according to the mismatch values; and whether the RX detection channel is abnormal or not can be judged according to the comparison result of the measurement value RX1, the measurement value RX2 and the measurement difference value RXD with the mismatch threshold value; if the measurement value RX1, the measurement value RX2 or the measurement difference RXD is larger than the mismatch threshold value, the detection channel is proved to have abnormality. The channel detection method can reduce the initialization time and complexity of the module and improve the accuracy of touch detection.
In step S304, the RX detection channel determined to be abnormal should be screened out, and the RX detection channel whose channel mismatch value does not exceed the mismatch threshold value is saved with its mismatch value so as to compensate for the touch screen module detection according to the saved mismatch value.
Furthermore, the measured data is recorded as the characterization quantity of each channel gain and used for correcting the software level, so that the detection precision is improved. If the number of the RX detection channels, of which the measurement difference RXD exceeds the deviation threshold, in the n RX detection channels reaches a set threshold, performing program normalization on the n RX detection channels. Whether the measured difference RXd of some RX detection channels exceeds the deviation threshold or the measured difference RXd of all RX detection channels exceeds the deviation threshold, the possibility that program normalization is required exists, for example, the threshold may be set to 1, if the measured difference RXd of the RX detection channels exceeds the deviation threshold, program normalization processing is performed on the RX detection channels, or the threshold is set to n, and if the measured difference RXd of n RX detection channels exceeds the deviation threshold, program normalization processing is performed on the RX detection channels, which may be set autonomously according to device parameters or user requirements. The normalized data of the program are:
。
the detection method of the capacitive touch screen can detect the mismatch value of each channel, compensates the touch screen detection module according to the mismatch value, effectively improves the detection accuracy of the touch screen, and reduces the initialization time and complexity of the module.
The invention also provides a detection device of the capacitive touch screen, which comprises: a built-in capacitance detection device; and the measurement screening module is used for detecting the mismatch value of the RX detection channel and judging whether the RX detection channel is abnormal or not.
Specifically, a measurement difference RXD of two measurement values RX1 and RX2 of the RX detection channel in the state of two different capacitance values is obtained, and a mismatch value is obtained according to the measurement values and the measurement difference values; and if the measured value RX1, the measured value RX2 and the measured difference RXD exceed the mismatch threshold, judging that the RX detection channel is abnormal.
Further, the method further comprises the following steps: the storage module is used for storing measurement data of the RX detection channel, and the measurement data comprise a measurement value RX1, a measurement value RX2, a measurement difference value RXD and a mismatch value. The touch screen module detection can be compensated by the mismatch value, so that the detection precision is improved; the measurement difference RXD can be used as the characterization quantity of each channel gain, used for correcting a software layer and improving the detection precision.
Further, the method further comprises the following steps: program setting module: for normalizing the RX detection channel. If the measured difference RXd of some or all RX detection channels is above the bias threshold, then they need to be programmed normalized at the software level. The manner in which the program normalizes the RX detection channel is by resetting the value toThis way, gain deviations of the individual channels can be compensated for.
The detection device of the capacitive touch screen can detect all RX detection channels and acquire the measurement data of all RX detection channels, compensates the touch screen detection module according to the measurement data, improves the detection accuracy of the capacitive touch screen, has smaller area compared with the capacitive touch screen in the prior art, can effectively reduce the manufacturing cost of chips, and can reduce the initialization time and complexity of the module in the detection mode.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A built-in capacitance detecting device, comprising:
an RX input channel, said RX input channel comprising: an RX detection channel and an off switch SW, wherein a first signal RX_TST is connected to the RX detection channel through the off switch SW; the variable capacitor is connected to the RX detection channel through the switching-off switch SW; a second signal VTX, the second signal VTX being connected to the variable capacitance;
the built-in capacitance detection device is used for determining a first capacitance value of the variable capacitance, closing the switch SW, accessing the first signal RX_TST, starting the second signal VTX, and acquiring a measured value RX1 by the RX detection channel; determining a second capacitance value of the variable capacitor, accessing the first signal RX_TST again, starting the second signal VTX, and acquiring a measured value RX2 by the RX detection channel; calculating a measurement difference RXD of the measurement value RX1 and the measurement value RX2, and obtaining a mismatch value; and if the measured value RX1, the measured value RX2 or the measured difference RXD exceeds a mismatch threshold, judging that the RX detection channel is abnormal.
2. The built-in capacitance detecting device according to claim 1, comprising: the number of the RX input channels is n, n is a natural number greater than 1, the mth RX detection channel is connected with one end of the corresponding mth switching-off switch SW, and the other ends of the n switching-off switches SW are connected with the variable capacitor, wherein 1= < m < = n.
3. A method for improving detection accuracy of a capacitive touch screen based on the built-in capacitance detection device of claim 1 or claim 2, comprising:
determining a first capacitance value of the variable capacitor, closing the switching-on/switching-off switch SW, accessing the first signal RX_TST, starting the second signal VTX, and acquiring a measured value RX1 by an RX detection channel;
determining a second capacitance value of the variable capacitor, accessing the first signal RX_TST again, starting the second signal VTX, and acquiring a measured value RX2 by the RX detection channel;
opening the switching-off switch SW, and closing the measurement of the RX detection channel;
calculating a measurement difference RXD of the measurement value RX1 and the measurement value RX2, and obtaining a mismatch value; and if the measured value RX1, the measured value RX2 or the measured difference RXD exceeds a mismatch threshold, judging that the RX detection channel is abnormal.
4. A method for improving detection accuracy of a capacitive touch screen according to claim 3, wherein n RX detection channels sequentially obtain a measurement value RX1 and a measurement value RX2, and calculate a measurement difference RXd between the measurement value RX1 and the measurement value RX2, and the mth RX detection channel is controlled to perform measurement through the mth switch SW.
5. The method according to claim 4, wherein if the number of RX detection channels whose measurement difference RXd exceeds the deviation threshold reaches a set threshold among n RX detection channels, program normalization is performed on the software level for the n RX detection channels.
6. The method for improving detection accuracy of a capacitive touch screen according to claim 5, further comprising, before the acquiring the mismatch value: setting the deviation threshold, the mismatch threshold and the set threshold.
7. The method for improving detection accuracy of a capacitive touch screen according to claim 5, wherein the program normalized data is:
。
8. the utility model provides a device for improving capacitive touch screen detection precision which characterized in that includes: the built-in capacitance detecting device according to claim 1 or claim 2; and the measurement screening module is used for detecting the mismatch value of the RX detection channel and judging whether the RX detection channel is abnormal or not.
9. The apparatus for improving detection accuracy of a capacitive touch screen of claim 8, further comprising: and the storage module is used for storing measurement data for measuring the RX detection channel.
10. The apparatus for improving detection accuracy of a capacitive touch screen of claim 8, further comprising: program setting module: for program normalizing the RX detection channel.
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| JP2018151951A (en) * | 2017-03-14 | 2018-09-27 | シャープ株式会社 | Touch position recognition circuit and touch input device with touch position recognition circuit |
| CN111782084A (en) * | 2020-07-01 | 2020-10-16 | 北京力游科技有限公司 | Touch detection method and device of display screen and display screen |
| CN115656640A (en) * | 2022-10-26 | 2023-01-31 | 上海艾为电子技术股份有限公司 | Capacitance detection method and capacitance detection device |
| CN116243825A (en) * | 2023-05-06 | 2023-06-09 | 成都市芯璨科技有限公司 | Touch detection chip and device based on capacitance detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9164137B2 (en) * | 2013-12-05 | 2015-10-20 | Parade Technologies, Ltd. | Tunable baseline compensation scheme for touchscreen controllers |
| KR20150093395A (en) * | 2014-02-07 | 2015-08-18 | 삼성전기주식회사 | Apparatus and method for sensing capacitance |
| US10068121B2 (en) * | 2015-08-31 | 2018-09-04 | Cypress Semiconductor Corporation | Baseline compensation for capacitive sensing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018151951A (en) * | 2017-03-14 | 2018-09-27 | シャープ株式会社 | Touch position recognition circuit and touch input device with touch position recognition circuit |
| CN111782084A (en) * | 2020-07-01 | 2020-10-16 | 北京力游科技有限公司 | Touch detection method and device of display screen and display screen |
| CN115656640A (en) * | 2022-10-26 | 2023-01-31 | 上海艾为电子技术股份有限公司 | Capacitance detection method and capacitance detection device |
| CN116243825A (en) * | 2023-05-06 | 2023-06-09 | 成都市芯璨科技有限公司 | Touch detection chip and device based on capacitance detection |
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