CN116243825B - Touch detection chip and device based on capacitance detection - Google Patents
Touch detection chip and device based on capacitance detection Download PDFInfo
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Classifications
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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
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
Abstract
The invention relates to a touch detection chip and a device based on capacitance detection, comprising a capacitance detection module, a single-ended unit and a calculation unit, wherein the capacitance detection module comprises m+1 capacitance detection RX pins and m differential units; every two capacitance detection RX pins are connected with one differential unit, capacitance variation signals of the capacitive touch device are received, signals received by the two capacitance detection RX pins are subtracted through the corresponding connection differential units, differential signal results are obtained, m differential signal results are subjected to reduction processing through a computing unit pair, and the capacitance variation is calculated and converted into coordinates of touch. The invention suppresses common mode noise on the touch detection device through the differential unit, and can retain useful signals; the differential unit is used for reducing common mode noise, and simultaneously, the auxiliary differential unit is used for effectively inhibiting the noise superposition effect introduced by the differential unit, so that the industrial problem of the touch differential scheme noise superposition is solved.
Description
Technical Field
The present invention relates to the field of touch detection technologies, and in particular, to a touch detection chip and device based on capacitive detection.
Background
At present, a capacitive touch device needs to overcome a large amount of common mode interference, especially after a flexible display is popularized, the problem that the common mode interference caused by a bottom display becomes the touch industry is solved, and the channel superposition effect exists in the traditional differential noise reduction technology, and if the effect is not restrained, the signal to noise ratio of a differential scheme is greatly reduced, so that the problem that the current need to consider is how to reduce the common mode interference among channels of the touch device while retaining useful signals and amplifying the useful signals is solved.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a touch detection chip and a device based on capacitance detection, and solves the defects in the prior art.
The aim of the invention is achieved by the following technical scheme: the touch control detection chip based on capacitance detection comprises a capacitance detection module and a calculation unit, wherein the capacitance detection module comprises m+1 capacitance detection RX pins, a plurality of capacitance detection TX pins and m differential units;
each two capacitance detection RX pins are connected with a differential unit, each capacitance detection RX pin receives a capacitance variation signal of the capacitive touch device, the signals received by the two capacitance detection RX pins are subtracted through the corresponding connection differential unit to obtain a differential signal result so as to achieve the purpose of noise reduction, and finally, the m differential signal results are subjected to reduction processing through a calculation unit to obtain an original capacitance variation result of each capacitance detection RX pin, and the capacitance variation is calculated and converted into touch coordinates.
The single-ended unit is connected with the first capacitance detection RX pin, a detection result RX0_S of the capacitance detection RX pin is obtained and sent to the calculation unit, a reference voltage is provided for the calculation unit, and the calculation unit sequentially carries out reduction processing through RX0_S and combining m differential signal results, so that common mode noise is suppressed.
The device further comprises a first auxiliary differential unit, wherein the first auxiliary differential unit is connected with the first capacitance detection RX pin and the mth capacitance detection RX pin, differential detection is carried out on the first capacitance detection RX pin and the mth capacitance detection RX pin, differential noise nA is obtained and sent to the computing unit, only the differential noise nA is overlapped from the mth capacitance detection RX pin by the differential unit, the number of overlapped noise of the m differential units is reduced, and optimization of a reduction processing result is achieved.
The device further comprises a second auxiliary differential unit, wherein the second auxiliary differential unit is connected with the first capacitance detection RX pin and the m/2 th capacitance detection RX pin, differential detection is carried out on the first capacitance detection RX pin and the m/2 th capacitance detection RX pin, differential noise nA2 is obtained, and the differential noise nA2 is sent to the computing unit, so that the differential unit only superimposes the differential noise nA2 from the m/2 th capacitance detection RX pin, the number of superimposed noise of the m differential units is reduced again, and optimization of a reduction processing result is achieved.
A capacitance detection device based on a touch detection chip comprises the touch detection chip;
and the capacitive touch module is used for converting the touch action into the capacitance variation of the corresponding position and transmitting the capacitance variation to the capacitance detection module.
The capacitive touch module comprises a plurality of TX wires which are longitudinally and sequentially arranged at equal intervals and a plurality of RX wires which are transversely and sequentially arranged at equal intervals, wherein the TX wires and the RX wires are not contacted, and a node capacitor is formed at the position where each TX wire and each RX wire vertically intersect; the quantity of the TX wires is consistent with the quantity of the capacitance detection TX pins in the touch detection chip, the quantity of each TX wire connected with the corresponding capacitance detection TX pin in the touch detection chip is consistent with the quantity of the capacitance detection RX pins in the touch detection chip, and each RX wire connected with the corresponding capacitance detection RX pin in the touch detection chip.
The invention has the following advantages: a touch detection chip and device based on capacitance detection are used for suppressing common mode noise on a touch detection device through a differential unit, and meanwhile useful signals can be reserved; the differential unit is used for reducing common mode noise, the auxiliary differential unit is designed, the noise superposition effect introduced by the differential unit is effectively inhibited, the industrial problem of the touch differential scheme noise superposition can be solved, the number of the auxiliary differential units can be flexibly configured according to the number of the capacitive detection RX pins, and the scheme flexibility is provided.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention;
FIG. 2 is a schematic diagram illustrating an internal connection between a touch detection chip and a capacitive touch module;
FIG. 3 is a schematic diagram of the result of a capacitive touch module;
FIG. 4 is a schematic diagram of a touch detection chip;
fig. 5 is a schematic structural diagram of a touch detection chip with a single-ended unit added;
FIG. 6 is a schematic diagram of the number of differential cell noise stacks;
fig. 7 is a schematic structural diagram of a touch detection chip with an auxiliary differential unit added;
FIG. 8 is a schematic diagram of the number of differential cell noise stacks with the addition of an auxiliary differential cell;
fig. 9 is a schematic structural diagram of a touch detection chip with two auxiliary differential units;
fig. 10 is a schematic diagram of the number of differential cell noise stacks after adding two auxiliary differential cells.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Accordingly, the following detailed description of the embodiments of the present application, provided in connection with the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application. The invention is further described below with reference to the accompanying drawings.
The invention provides a capacitive touch detection technology, which uses a differential noise reduction technology of configurable channels, can offset common mode interference among channels by using adjacent channels, can offset noise while still retaining useful signals, and can amplify the useful signals. The configurable channel scheme can flexibly configure the auxiliary differential channel, reduce differential superposition noise and improve the signal-to-noise ratio and adaptation universality of the differential scheme.
As shown in fig. 1, the touch panel comprises a touch detection chip and a capacitive touch device. The capacitive touch device is a conversion device that can convert a touch action into a change in capacitance by the detected unit. The touch detection chip is a main body for detecting, and is used for sensing the capacitance variation of the capacitive touch device and converting the variation into the touch coordinates.
As shown in fig. 2, the internal circuit structure of the capacitive touch pad is a conductive trace staggered horizontally and vertically. One of which is a plurality of TX traces and a plurality of RX traces perpendicular to the TX traces. The TX wiring and the RX wiring are not contacted, and a node capacitor is formed between the two wirings at the crossing position of each TX wiring and each RX wiring. The TX wiring and the RX wiring are respectively connected to a capacitance detection TX pin and a capacitance detection RX pin of the detection chip through conductive connecting wires.
As shown in fig. 3, specifically, the node capacitance is a capacitance formed by the intersection area of the TX trace and the RX trace, and after each node capacitance area is touched, the capacitance value of the node capacitance changes. Thereby causing a change in the signal reaching the capacitive sense RX pin.
As shown in fig. 4, each capacitive detection RX pin is inside the touch detection chip and connected to a differential unit. For example, the capacitance detection pin RX0 and the capacitance detection pin RX1 are connected to the differential unit 1. The function of the differential unit is to subtract the signals of the two capacitive sense RX pins. For example, RX0 and RX1 will get the differential signal result (RX 0-RX 1) after passing through the differential unit 1. The result is sent to the computing unit for further processing. When the signals on the capacitance detection pins RX0 and RX1 superimpose common mode noise (Commonnoise), then the RX0 signal will become (Rx0+Commonnoise) and the RX1 signal will become (Rx1+Commonnoise). After the two interfered signals RX0 and RX1 pass through the differential unit, a differential signal result of (RX 0-RX 1) can be obtained, and thus the noise reduction effect is achieved through the differential unit.
When m+1 capacitors are used for detecting RX pins, m differential signal results can be obtained. The m differential signal results are sent to a computing unit for reduction processing. The reduction process is to reduce the differential signal result to the original result of capacitance detection RX pin of each channel.
Further, as shown in fig. 5, to restore the result of each channel, a single-ended cell needs to be added. The single-ended unit can directly obtain the result of the capacitance detection pin RX0, and becomes RX0_S. The calculation unit can restore all channels by restoring the result of RX0_S and all differential signals, providing a reference voltage value by a single-ended unit, and adding the two-by-two difference values of all subsequent channels by a reference value. The method comprises the following steps:
RX[0]=RX[0]_S；
RX[1]=RX[0]-(RX[0]-RX[1])=RX[0]_S-(RX[0]-RX[1])；
RX[2]=RX[1]-(RX[1]-RX[2])=RX[0]_S-(RX[0]-RX[1])-(RX[1]-RX[2])；
…
RX[m]=RX[0]_S-(RX[0]-RX[1])-(RX[1]-RX[2])-…-（RX[m-1]-RX[m]）；
the method realizes the signal detection of each capacitive detection RX pin through a plurality of differential units and a single-ended unit, and common mode noise is suppressed through the differential units in the process.
Since the differential units must introduce noise during the differential process, the noise introduced by each differential unit is different. The differential cell noise introduced by differential cell 1 is denoted as n 1, the differential cell noise introduced by differential cell 2 is denoted as n 2, and the differential cell noise introduced by differential cell m is denoted as n m. A plurality of differential unit noise terms are added to the reduction result:
RX[0]=RX[0]_S；
RX[1]=RX[0]-(RX[0]-RX[1])=RX[0]_S-(RX[0]-RX[1])+n[1]；
RX[2]=RX[0]_S-(RX[0]-RX[1])-(RX[1]-RX[2])+n[2]+n[1]=
…
RX[m]=RX[0]_S-(RX[0]-RX[1])-(RX[1]-RX[2])-…-(RX[m-1]-RX[m])+n[m]+…+n[2]+n[1]。
from the above, the last capacitor detection RX pin is superimposed with m differential unit noises, resulting in a degradation of signal quality. This effect is the noise superposition effect introduced by the differential scheme. The number of noise stacks is shown in fig. 6.
As shown in fig. 7, an auxiliary differential unit is designed to solve the noise superposition effect. The auxiliary differential unit will perform differential detection on RX0 and RXm to obtain differential results (RX 0-RXm), and the auxiliary differential unit introduces differential noise denoted nA. The reduction results of all the touch detection RX channels can be optimized as follows:
RX[0]=RX[0]_S；
RX[1]=RX[0]_S-(RX[0]-RX[1])+n[1]；
RX[2]=RX[0]_S-(RX[0]-RX[1])-(RX[1]-RX[2])+n[2]+n[1]；
…
RX[m-1]=RX[0]_S-(RX[0]-RX[m])+(RX[m-1]-RX[m])+nA+n[m-1]；
RX[m]=RX[0]_S-(RX[0]-RX[m])+nA；
by this method, only 1 differential unit noise nA is superimposed from RX [ m ], 2 differential noise (nA+n [ m-1 ]) is superimposed from RX [ m-1], the number of superimposed noise is greatly reduced, and the signal quality is greatly improved. The largest differential cell noise overlap location occurs in the middle most channel in the capacitive sense RX pin, overlapping about m/2 differential cell noise, as shown in FIG. 8.
As shown in fig. 9, in order to further reduce the number of differential cell noise overlaps, auxiliary differential cells may be added. Two auxiliary differential units are used, one auxiliary differential unit 2 is added, which introduces differential noise denoted nA2. After using 2 auxiliary differential units, the reduction results of all touch detection RX channels can be optimized as follows:
RX[0]=RX[0]_S；
RX[1]=RX[0]_S-(RX[0]-RX[1])+n[1]；
RX[2]=RX[0]_S-(RX[0]-RX[1])-(RX[1]-RX[2])+n[2]+n[1]；
…
RX[m/2]=RX[0]_s-(RX[0]-RX[m/2])+nA2；
…
RX[m-1]=RX[0]_S-(RX[0]-RX[m])+(RX[m-1]-RX[m])+nA+n[m-1]；
RX[m]=RX[0]_S-(RX[0]-RX[m])+nA；
by this method, only 1 differential cell noise nA is superimposed from RX [ m/2 ]. The largest differential unit noise superposition position appears at 1/4 and 3/4 positions in the capacitance detection RX pins, about m/4 differential unit noises are superposed, as shown in FIG. 10, auxiliary differential units can be continuously added at the 1/4m and 3/4m capacitance detection RX pins, and the superposed differential unit noises can be further reduced.
According to the invention, by adding the auxiliary differential channel, the differential unit noise superposition effect in the differential scheme can be effectively inhibited, and the restored signal quality of the restored touch detection RX channel is provided. The degree of suppression of the noise superposition effect depends on the increase of the number of auxiliary differential units, and the maximum superposition differential unit noise superposition amount can be reduced to a lower level by using more auxiliary differential units. The number of the differential auxiliary units can be determined according to the number of the control detection RX channels of the touch detection chip, so that the flexibility of touch detection is improved.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (4)
1. The utility model provides a touch-control detects chip based on electric capacity detects which characterized in that: the capacitive detection module comprises m+1 capacitive detection RX pins, a plurality of capacitive detection TX pins and m differential units;
each two capacitance detection RX pins are connected with a differential unit, each capacitance detection RX pin receives a capacitance variation signal of the capacitance touch device, signals received by the two capacitance detection RX pins are subtracted by the corresponding connection differential unit, a differential signal result is obtained, the purpose of noise reduction is achieved, and finally m differential signals are obtained;
the single-ended unit is connected with a first capacitance detection RX pin, a detection result RX0_S of the capacitance detection RX pin is obtained and sent to the calculation unit, a reference voltage is provided for the calculation unit, the calculation unit sequentially carries out reduction processing through RX0_S and combining m differential signal results, an original capacitance variation result of each capacitance detection RX pin is obtained, and the capacitance variation is calculated and converted into a touch coordinate through calculation;
the device further comprises a first auxiliary differential unit, wherein the first auxiliary differential unit is connected with the first capacitance detection RX pin and the mth capacitance detection RX pin, differential detection is carried out on the first capacitance detection RX pin and the mth capacitance detection RX pin, differential noise nA is obtained and sent to the computing unit, only the differential noise nA is overlapped from the mth capacitance detection RX pin by the differential unit, the number of overlapped noise of the m differential units is reduced, and optimization of a reduction processing result is achieved.
2. The touch detection chip based on capacitive detection according to claim 1, wherein: the device further comprises a second auxiliary differential unit, wherein the second auxiliary differential unit is connected with the first capacitance detection RX pin and the m/2 th capacitance detection RX pin, differential detection is carried out on the first capacitance detection RX pin and the m/2 th capacitance detection RX pin, differential noise nA2 is obtained, and the differential noise nA2 is sent to the computing unit, so that the differential unit only superimposes the differential noise nA2 from the m/2 th capacitance detection RX pin, the number of superimposed noise of the m differential units is reduced again, and optimization of a reduction processing result is achieved.
3. A capacitance detection device based on a touch detection chip is characterized in that: the touch detection chip according to claim 1 or 2;
and the capacitive touch module is used for converting the touch action into the capacitance variation of the corresponding position and transmitting the capacitance variation to the capacitance detection module.
4. The capacitive sensing apparatus based on a touch sensing chip as claimed in claim 3, wherein: the capacitive touch module comprises a plurality of TX wires which are longitudinally and sequentially arranged at equal intervals and a plurality of RX wires which are transversely and sequentially arranged at equal intervals, wherein the TX wires and the RX wires are not contacted, and a node capacitor is formed at the position where each TX wire and each RX wire vertically intersect; the quantity of the TX wires is consistent with the quantity of the capacitance detection TX pins in the touch detection chip, the quantity of each TX wire connected with the corresponding capacitance detection TX pin in the touch detection chip is consistent with the quantity of the capacitance detection RX pins in the touch detection chip, and each RX wire connected with the corresponding capacitance detection RX pin in the touch detection chip.
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| CN116880717B (en) * | 2023-09-07 | 2023-12-12 | 上海海栎创科技股份有限公司 | Capacitance detection device, and method and device for improving detection precision of capacitive touch screen |
| CN117389434B (en) * | 2023-12-12 | 2024-03-29 | 基合半导体（宁波）有限公司 | Signal detection method applied to touch screen, device and storage medium |
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