CN107168596B - Scanning method of capacitive touch screen and capacitive touch screen - Google Patents
Scanning method of capacitive touch screen and capacitive touch screen Download PDFInfo
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- CN107168596B CN107168596B CN201710611971.3A CN201710611971A CN107168596B CN 107168596 B CN107168596 B CN 107168596B CN 201710611971 A CN201710611971 A CN 201710611971A CN 107168596 B CN107168596 B CN 107168596B
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
Abstract
The invention relates to a scanning method of a capacitive touch screen and the capacitive touch screen. The scanning method of the capacitive touch screen comprises the following steps: global scanning to obtain at least one touch point; and setting the obtained line ranges of all the touch points as a central area, and only scanning lines with preset values extending outwards at two adjacent ends of the central area as lines for reporting points. The scanning method can reduce the overall scanning times, thereby effectively reducing the power consumption of the capacitive touch screen in the scanning process, and simultaneously effectively improving the point reporting rate of touch points, thereby more truly restoring the touch track. The touch effect of the capacitive touch screen is improved, and meanwhile the touch experience of a user can be enhanced.
Description
Technical Field
The present invention relates to the field of touch technologies, and in particular, to a scanning method for a capacitive touch screen and the capacitive touch screen.
Background
When the capacitive touch screen detects a touch signal, touch point detection is performed by an axis coordinate type sensing unit matrix formed on the display screen. For example, the capacitive touch screen includes Tx lines and Rx lines crossing each other, wherein a single touch point corresponds to one node where the Tx lines and the Rx lines cross. Specifically, in the touch sensor and the touch screen driving circuit formed between the Tx line and the Rx line, the touch screen driving circuit provides a driving signal to the Tx line, samples the voltage of the touch sensor received through the Rx line, converts the sampled voltage into digital data, and determines the position of a touch point on the capacitive touch screen through data analysis and calculation.
However, in the prior art, when performing the touch screen detection scanning, a plurality of global scanning methods are adopted, that is, after scanning all nodes formed by crossing Tx lines and Rx lines on the touch screen, it is determined which node is pressed by a finger according to each node signal. However, such a scanning method not only consumes more power, but also cannot effectively improve the report rate (reporting rate) for feeding back touch information.
Disclosure of Invention
Therefore, it is necessary to provide a scanning method of a capacitive touch screen and the capacitive touch screen, which can effectively reduce the power consumption of the capacitive touch screen and improve the click rate, for solving the problems of high scanning power consumption and low click rate of the capacitive touch screen.
A scanning method of a capacitive touch screen comprises the following steps:
global scanning to obtain at least one touch point;
setting the obtained line ranges of all touch points as a central area;
and scanning only the line with the preset value expanded outwards at the two adjacent ends of the central area as a line for reporting points.
In one embodiment, the global scan includes acquiring at least two touch points.
In one embodiment, the preset value is set according to the number of touch points acquired by the global scan.
In one embodiment, the larger the number of touch points is, the smaller the preset value is.
In one embodiment, the global scan is performed to obtain at least one touch point every a preset time period.
In one embodiment, when only one touch point is acquired in the preset time period, the preset time period plus the preset time length is used as a new preset time period.
In one embodiment, when only one touch point is acquired within a preset time period, the global scanning is replaced by the area scanning.
In one embodiment, the area scanned by the area is determined according to the duration of a preset time period and the position of the touch point.
In one embodiment, the area scanned by the area scanning is an area included by the preset value lines in four directions, namely, up, down, left, and right, of the touch point.
A capacitive touch screen realizes touch detection by the scanning method of any one of the embodiments.
According to the scanning method of the capacitive touch screen and the capacitive touch screen, the acquired touch points are taken as the central area through the touch points acquired in the global scanning mode, and then the scanning lines corresponding to different preset values are used for area scanning until the touch lines at two adjacent ends of the central area are scanned. And reporting the contact information to the host when the touch circuits at the two adjacent ends of the central area are scanned, and completing point reporting. Therefore, the scanning work can be effectively optimized, namely continuous multiple times of global scanning are not carried out to determine the position of the touch point, so that the power consumption of the capacitive touch screen in the scanning process is effectively reduced, and meanwhile, the point reporting rate of the touch point is effectively improved, and the touch track can be more truly restored. The touch effect of the capacitive touch screen is improved, and meanwhile the touch experience of a user can be enhanced.
Drawings
Fig. 1 is a schematic flowchart illustrating a scanning method of a capacitive touch screen according to an embodiment;
FIG. 2 is a schematic flowchart illustrating a scanning method of a capacitive touch screen according to another embodiment;
FIG. 3 is a schematic view illustrating scanning of an axis coordinate of a capacitive touch screen when a touch point is scanned according to an embodiment;
fig. 4 is a schematic view illustrating scanning of an axis coordinate of a capacitive touch screen when three touch points are scanned according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "top," "bottom," "top," and the like are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
For example, a scanning method of a capacitive touch screen includes the following steps: global scanning to obtain at least one touch point; setting the obtained line ranges of all touch points as a central area; and scanning only the line with the preset value expanded outwards at the two adjacent ends of the central area as a line for reporting points.
For example, referring to fig. 1 and fig. 2, a scanning method of a capacitive touch screen includes the following steps:
110: and globally scanning to obtain at least one touch point.
The scanning method in this embodiment is not limited to the self-capacitance or mutual capacitance touch screen architecture, and since the pre-scanning must be sequentially performed for the self-capacitance touch screen, that is, the pre-global scanning must be performed, the scanning method of the capacitive touch screen in this embodiment first performs the global scanning. In the global scanning, all nodes formed by crossing Tx lines for providing driving signals and Rx lines for sensing signals in the capacitive touch screen are scanned to obtain touch points pressed by fingers. For example, when a finger touches the capacitive touch screen, one or more nodes are touched, that is, one or more touch points can be detected through global scanning.
120: and setting the acquired line range of all touch points as a central area.
For example, the central area is a node corresponding to one touch point when one touch point is detected during the first global scan. When further area scanning is carried out, scanning is carried out in a line range formed by the T lines and the R lines at two adjacent ends of the central area, a scanning result at the time is fed back to report points, and information feedback is carried out on the scanned touch points. For example, as shown in fig. 3, when the first global scan is performed, the acquired touch point is T5& R5, that is, a node indicated by a circle in fig. 3. Taking the touch point T5& R5 as the center area, the T lines at two adjacent ends of T5& R5 are T4 and T6, respectively, and the R lines at two adjacent ends of T5& R5 are R4 and R6, respectively, so that the scanning of the areas at two adjacent ends of the center area at this time is: a driving signal is sent by T4, and signals are sequentially detected by R4-R5-R6; a driving signal is sent by T5, and signals are sequentially detected by R4-R5-R6; the driving signal is sent by T6, and the signals are sequentially detected by R4-R5-R6. Then the scan number is 3 × 3 ═ 9 times, and the scan result is reported. That is, reporting points are performed when scanning the lines at two adjacent ends of the central area, that is, the lines at two adjacent ends of the central area are taken as the reporting points. It will be appreciated that new touch points may or may not be scanned during this scanning process. Compared with the method of continuously performing multiple global scans, the scanning frequency is reduced due to the extremely reduced number of scans, so that the effect of saving power can be achieved.
For example, the global scan includes acquiring at least two touch points. That is, when the global scan is performed, the number of touch points acquired is 2 or more than 2. It will be appreciated that when a global scan is performed, when only one touch point is acquired, it is easier to determine the scan range when performing the scan. Therefore, in the present embodiment, it is required to perform scanning in an area scanning manner when at least two or more touch points are acquired. For example, as shown in fig. 4, when the first global scan is performed, if three touch points are acquired, the central area is a line area formed by T lines and R lines located at the periphery of the three touch points. For example, in fig. 4, the three points marked by circles are the three scanned touch points, T5& R5, T8& R2 and T3& R3, respectively, and the central area is a line range formed by T3-T8 and R2-R5, that is, when the second scanning is performed, only the scanning area formed by lines at two ends adjacent to T3-T8 and R2-R5, that is, only the nodes in the range of T2-T9 and R1-R6 are scanned, that is, 6 × 8 to 48 scans are performed, and the touch point information is fed back at the same time. Similarly, when scanning three touch points, the number of scans is greatly reduced compared to performing a plurality of consecutive global scans, and the scanning frequency is reduced, thereby achieving the power saving effect.
130: and scanning only the line with the preset value expanded outwards at the two adjacent ends of the central area as a line for reporting points.
Specifically, for example, when a new touch point obtained by global scanning or area scanning is an original touch point, only the lines at two adjacent ends of the touch point are scanned to report the point; for example, when an original touch point is obtained by last global scanning or area scanning, a new touch point is obtained by the current global scanning or area scanning, and the new touch point is the original touch point, only the lines at two adjacent ends of the touch point are scanned to report points; for example, when two or more original touch points are obtained by global scanning or regional scanning at the last time, two or more new touch points are obtained by global scanning or regional scanning at the current time, and each new touch point is respectively an original touch point, setting the obtained line range of all the touch points as a central area, and only scanning lines at two adjacent ends of the central area to report points; for example, when a new touch point obtained by global scanning or area scanning exceeds the line range of two adjacent preset values of an original touch point, taking the line range of the new touch point and the original touch point as a central area, and only scanning the lines of the two adjacent preset values of the central area to report points.
It should be noted that, when the number of the touch points is less than or equal to three, the preset value of the adjacent two ends of the central area is self-defined to be 0. That is to say, when the number of the touch points acquired during the first global scanning is small, the scanning and reporting are directly performed in the line range formed by the T lines and the R lines at the two adjacent ends of the central area, and the scanning is not further expanded outward from the central area to perform the scanning in the preset value range. Therefore, the scanning number is effectively reduced, and the power consumption of the touch screen is correspondingly saved. And because the scanning number is effectively reduced, the report rate is correspondingly effectively improved, and the touch track can be more truly restored.
When multi-touch point scanning is performed, that is, when first global scanning is performed, and the number of acquired touch points is large, because the range of the touch screen occupied by the touch points is large when the number of the touch points is large, in order to avoid scanning the touch points, a line with a preset value expanded outwards in a central area formed by each touch point is adopted, that is, the scanning range is expanded, two adjacent ends of the central area formed by the touch points are not used as the scanning range any more, the scanning range is further expanded outwards, and then the lines are scanned successively until the lines reach the two adjacent ends of the central area. For example, the line with the preset value expanded outwards is the line at the farthest ends of two sides of the central area, then the scanning range is gradually reduced, and each time the area scanning is completed, the scanned touch point is reported. And ending the scanning within the area range until the line of the preset value is superposed with the lines at the two adjacent ends of the central area. For accurate scanning, whether the touch is detected at other places or not can be detected, the global scanning can be returned again, and then the area scanning is carried out. It will be appreciated that such a scanning pattern may be cycled through a number of times depending on the particular implementation.
Specifically, regarding the area scanning, taking the single point T5& R5 touch as an example, please refer to fig. 2 again, and the specific scanning process is as follows:
the first step is as follows: carrying out global scanning;
the second step is that: determining the T5& R5 node as a touch point;
the third step: scanning is performed when the preset value is equal to 1, i.e. T2, T3, T4 … … Tn-1And R2, R3, R4 … … Rn-1Scanning; judging that the area scanned by the area is not equal to T5&The line regions at two adjacent ends of the central region formed by R5 coincide with the line regions formed by T4-T6 and R4-R6, and if the scanning area is larger than T5&The adjacent two ends of the central region formed by R5 are scanned to obtain T5&Scanning areas at two adjacent ends of the central area of R5 and reporting points;
the fourth step: scanning when a preset value is equal to 2, namely scanning when x is set to be 2, namely scanning of T3, T4 … … Tn-x, R3 and R4 … … Rn-x is performed, similarly, judging that the scanning range of the area is overlapped with the line areas at two adjacent ends of the central area formed by T5& R5, namely overlapped with the line areas formed by T4-T6 and R4-R6, and scanning the scanning areas at two adjacent ends of the central area formed by T5& R5 and reporting if the scanning area is larger than the line areas at two adjacent ends of the central area formed by T5& R5;
the fifth step: and returning to the global scanning which is carried out for the first time by judging that the scanning area is superposed with the circuit areas at the two adjacent ends of the central area formed by the T5& R5, and scanning to detect whether the other parts of the touch screen are touched or not.
It can be understood that when only one touch point is detected for a long time, the power saving mode can be achieved by reducing the number of scanning lines each time, for example, the third step and the fourth step are performed by gradually increasing the preset value, and reducing the number of T lines and R lines each time, to perform area scanning. In addition, when only one touch point is detected for a long time, the number of times of global scanning can be reduced by the area scanning mode, that is, when only one touch point is detected for a long time, the time of next global scanning can be prolonged, and accordingly, the scanning power consumption can be saved. Compared with multiple global scanning, the area scanning method effectively reduces the scanning number of the touch points, thereby effectively saving the power consumption of the touch screen during scanning. Meanwhile, corresponding point reporting is carried out every time the area scanning of the preset value is carried out, so that the point reporting rate is effectively improved, and the scanning effect of the touch screen can be effectively optimized by adopting the area scanning mode.
In order to accurately set the preset value, the scanning range of the area is determined. For example, the preset value is set according to the number of touch points acquired by the global scan. That is to say, the preset value is determined according to the number of the touch points acquired by the global scanning, so that the area scanning with the preset value is determined, and thus, the phenomenon that due to the fact that the preset value for setting the area scanning is too large, part of the area is repeatedly scanned, power consumption of the capacitive touch screen is increased, and the purpose of saving power is not facilitated is prevented. For example, at least one touch point is obtained, and the center of the touch point and two adjacent lines of the touch point are scanned. That is, when the number of touch points scanned globally is large, the range of the central area is relatively large, and it can be understood that, the distance between two adjacent edges of the central area and the farthest end of the central area is also relatively small, the set preset value is also relatively small, for example, when the preset value is set to 1, the line scanned by the area coincides with the lines at two adjacent ends of the central area. For example, when the preset value is set to 2, after two region scans in different ranges are performed, the last region scan coincides with the lines at two adjacent ends of the central region. Therefore, the preset value can be set through the touch points acquired through global scanning, so that area scanning can be reasonably performed, repeated continuous scanning of a unified area caused by unreasonable preset value setting is avoided, and power consumption in scanning is not saved. Therefore, the scanning frequency can be reduced, especially for a touch screen with a large panel, under the condition that the number of T lines and R lines is large, the power consumption can be still saved and the report rate can be improved by carrying out area scanning according to the preset value.
To detect whether other portions of the touch screen are touched, for example, every predetermined time period, the global scan is performed to obtain at least one touch point. That is, after a global scan is performed, the scan is performed in a region scan manner, and a period of time elapses during the scan, that is, the preset time period is a time period for performing the region scan. After the regional scanning is finished, the global scanning is carried out. Therefore, the undetected touch points can be effectively scanned in the new global scanning and area scanning, and the omission of scanning all the touch points can be better avoided.
In order to reduce the scanning frequency, the purpose of saving power is achieved. For example, when only one touch point is acquired within the preset time period, the preset time period plus the preset time length is used as a new preset time period. That is, when one new touch point is obtained through the area scanning, the interval time between two times of global scanning is further extended by extending the global scanning time each time, that is, adding a preset time length to the preset time period used by the area scanning, so that the scanning frequency can be reduced, and the purpose of saving power is achieved. For example, when only one touch point is acquired within a preset time period, the global scan is replaced by the area scan. For the determination of the area scanning, for example, the area scanned by the area scanning is an area included by the line of the preset value in four directions, i.e., up, down, left, and right, of the touch point. For example, when there is one touch point, the scanning area to be performed is an area surrounded by lines in four directions, i.e., the upper, lower, left, and right directions, adjacent to the touch point, and for example, the scanning area of T5& R5 is defined by T4& R4, T4& R5, and T4& R6; t6& R4, T6& R5 and T6& R6; r6& T4, R6& T5 and R6& T6; r4& T4, R4& T5 and R4& T69 nodes. Accordingly, when there are a plurality of touch points, the scan area is determined in this manner as well. In this way, in the preset scanning time period, when only one touch point is scanned, it is indicated that in this case, the probability that other touch points exist in the scanning area is relatively low, and therefore, it is not necessary to perform global scanning again, and instead, the area scanning is adopted instead of the global scanning. The regional scanning replaces the global scanning, and when the same scanning purpose is achieved, the regional scanning can reduce the scanning frequency, so that the scanning power consumption is saved. For example, the area scanned by the area is determined according to the duration of a preset time period and the position of the touch point. That is, according to the positions of the touch points on the touch screen, the positions are different, and the scanning areas formed by the lines with preset values expanded outwards at the two adjacent ends of the central area by taking the lines of all the touch points as the lines of the central area are also different. And because the preset time period is the interval time period of two global scans with interval of the area scan, the interval area scan needs to be determined by referring to the time period, otherwise, the problem of unreasonable scanning time setting is caused, and the scanning precision cannot be ensured. Therefore, the area scanning is determined by the position of the touch point and the preset time period, the scanning precision can be ensured, the aim of saving electricity is fulfilled conveniently, and meanwhile, the scanning area can be relatively accurately determined, so that the touch point can be scanned without leakage.
For example, a capacitive touch screen realizes touch scanning by the scanning method. That is, the scanning of the touch points of the capacitive touch screen can be realized by using the scanning method of the capacitive touch screen in any of the above embodiments. In the scanning method in any of the embodiments, the acquired touch point is taken as a central area by the touch point acquired in the global scanning manner, then the touch lines at two adjacent ends of the central area are scanned according to the scanning lines of the preset values, and when the touch lines at two adjacent ends of the central area are scanned, the touch point information is reported to the host computer, so that the point reporting is completed. Therefore, the scanning work of the capacitive touch screen applying the method is optimized, the touch points are not continuously scanned for multiple times, the power consumption of the capacitive touch screen in the scanning process can be effectively reduced, the point reporting rate of the touch points is effectively improved, the touch track can be restored more truly, the touch effect of the capacitive touch screen can be achieved, and the touch experience of a user is enhanced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A scanning method of a capacitive touch screen is characterized by comprising the following steps:
global scanning to obtain at least one touch point;
setting the obtained line ranges of all touch points as a central area;
scanning only a line with preset values expanded outwards at two adjacent ends of the central area as a line for reporting points, wherein when the number of the touch points is less than or equal to three, the preset values expanded outwards at two adjacent ends of the central area are self-defined as 0; when the number of the touch points is more than three, performing area scanning on scanning routes corresponding to different preset values until scanning to the lines at two adjacent ends of the central area;
and when the new touch point obtained by global scanning exceeds the line range of the two adjacent preset values of the original touch point, taking the line range of the new touch point and the original touch point as a central area, and scanning only the lines of the two adjacent preset values of the central area to report points.
2. The method of claim 1, wherein the global scanning comprises acquiring at least two touch points.
3. The method of claim 1, wherein the preset value is set according to the number of touch points obtained by the global scan.
4. The method for scanning a capacitive touch screen according to claim 1, wherein at least one touch point is obtained, and the center of the touch point and two adjacent lines of the touch point are scanned.
5. The method of claim 1, wherein the scanning is performed globally every predetermined time period to obtain at least one touch point.
6. The method for scanning a capacitive touch screen according to claim 5, wherein when only one touch point is acquired within the preset time period, the preset time period plus a preset time length is adopted as a new preset time period.
7. The method of claim 5, wherein the global scan is replaced with a region scan when only one touch point is obtained within a predetermined time period.
8. The method for scanning a capacitive touch screen according to claim 7, wherein the area scanned by the area is determined according to the duration of a preset time period and the position of the touch point.
9. The method for scanning a capacitive touch screen according to claim 7, wherein the area scanned by the area is an area included by the preset-value lines in four directions, i.e., up, down, left, and right, of the touch point.
10. A capacitive touch screen, characterized in that it employs the scanning method according to any one of claims 1 to 9 to implement touch scanning.
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| CN108595063B (en) * | 2018-05-03 | 2021-06-01 | 业成科技（成都）有限公司 | Touch screen scanning method, computer device and storage medium |
| CN108776553A (en) * | 2018-06-11 | 2018-11-09 | 业成科技（成都）有限公司 | Two-sided touch-control display module and its triggering method |
| CN109445651A (en) * | 2018-11-09 | 2019-03-08 | 张银虎 | Electromagnetic screen antenna scanning method |
| TWI684901B (en) * | 2018-12-04 | 2020-02-11 | 大陸商北京集創北方科技股份有限公司 | Touch device, touch method and information processing device capable of zone touch scanning |
| CN110058739B (en) * | 2019-04-19 | 2022-09-09 | Oppo广东移动通信有限公司 | Control method, control device, electronic apparatus, computer-readable storage medium |
| CN110174964B (en) * | 2019-05-06 | 2022-07-29 | Oppo广东移动通信有限公司 | Scanning method, scanning device, electronic device and computer-readable storage medium |
| CN111766984B (en) * | 2020-01-30 | 2023-08-22 | 吉林师范大学 | In-cell touch screen and positioning function algorithm thereof |
| CN111969991B (en) * | 2020-08-17 | 2023-08-01 | 业成科技（成都）有限公司 | Three-dimensional touch device and control method thereof |
| CN115933952B (en) * | 2021-08-28 | 2023-11-24 | 荣耀终端有限公司 | Touch sampling rate adjusting method and related device |
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