WO2014127716A1 - Method and apparatus for positioning touch point on touch screen - Google Patents
Method and apparatus for positioning touch point on touch screen Download PDFInfo
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- WO2014127716A1 WO2014127716A1 PCT/CN2014/072257 CN2014072257W WO2014127716A1 WO 2014127716 A1 WO2014127716 A1 WO 2014127716A1 CN 2014072257 W CN2014072257 W CN 2014072257W WO 2014127716 A1 WO2014127716 A1 WO 2014127716A1
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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
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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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
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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
- G06F2203/04106—Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
Abstract
A method and an apparatus for positioning a touch point on a touch screen are provided. The method includes: detecting simultaneously a self-capacitance and a mutual capacitance of a sensor in the touch screen to obtain a self-capacitance positioning result and a mutual capacitance detecting result respectively; obtaining a mutual capacitance positioning result according to the mutual capacitance detecting result; determining a location of the touch point according to the self-capacitance positioning result and the mutual capacitance positioning result.
Description
METHOD AND APPARATUS FOR POSITIONING TOUCH POINT ON TOUCH SCREEN
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority and benefits of Chinese Patent Application No. 201310053585.9, filed with State Intellectual Property Office, P. R. C. on February 19, 2013, the entire content of which is incorporated herein by reference.
FIELD
Embodiments of the present disclosure generally relate to a touch screen field, and more particularly, to a method and an apparatus for positioning a touch point on a touch screen.
BACKGROUND
Conventional methods for scanning a capacitive touch screen typically include a self-capacitance scanning method and a mutual capacitance scanning method. The self-capacitance scanning method refers to scanning a capacitance formed between a channel in the capacitive touch screen and a finger touching the screen, while the mutual capacitance scanning method refers to scanning a capacitance formed between channels in the capacitive touch screen. The self-capacitance scanning method is lightly influenced by water and has a great anti- interference capability, but cannot recognize a multi-touch, i.e., only supports a single touch. The mutual capacitance scanning method can support the multi-touch and is widely applied in smart phones and tablet computers. However, the mutual capacitance scanning method has a lower waterproof property and a lower anti- interference capability than the self-capacitance scanning method. During the mutual capacitance scanning, when there is water on the capacitive touch screen, the scanned capacitance increases; when there is a finger touch on the capacitive touch screen, the scanned capacitance decreases; when there are both water and the finger touch on the capacitive touch screen, the scanned capacitance is less than that obtained when there is only the finger touch on the capacitive touch screen. According to the above principles, whether there is water or the finger touch on the capacitive touch screen can be recognized by software, however, it is difficult to realize. Since whether there has been water on the capacitive touch screen before the capacitive touch screen is turned on cannot be determined, and if the scanned mutual capacitance decreases when the water is wiped away from the touch screen, the software may probably misjudge that the capacitive touch screen is touched constantly by the finger. Thus, interference points will appear in the capacitive touch screen continuously, even resulting in a dysfunction. In conclusion, neither the
self-capacitance scanning method nor the mutual capacitance scanning method can accurately determine a location touched by a finger.
In addition, charger interference generally influences the mutual capacitance scanning. The frequency of the charger is generally close to the scanning frequency of the mutual capacitance scanning method. Once the frequency of the charger is too close to the scanning frequency of the mutual capacitance scanning method, it is easy to cause incorrect reporting in the touch screen. Thus, a frequency avoiding method is used to avoid the charger interference, i.e., the scanning frequency of the mutual capacitance scanning method is as far away from the charger frequency as possible. However, frequencies of chargers are different from each other and frequencies of different types of chargers also have a big difference from each other. Thus, the frequency of each type of charger is adjusted once during the production. However, with the above method, it cannot ensure that the charger interference can be avoided for all the products, and once another type of charger is used to replace the original charger, problems will come out.
SUMMARY
Embodiments of the present disclosure seek to solve at least one of the problems existing in the prior art to at least some extent.
For this, a first objective of embodiments of the present disclosure is to provide a method for positioning a touch point on a touch screen, which not only avoids a water interference and a charger interference, but also supports for multi-touch, thus improving a positioning accuracy.
A second objective of embodiments of the present disclosure is to provide an apparatus for positioning a touch point on a touch screen.
In order to realize the above objectives, according to embodiments of a first broad aspect of the present disclosure, there is provided a method for positioning a touch point on a touch screen, comprising: detecting simultaneously a self-capacitance and a mutual capacitance of a sensor in the touch screen to obtain a self-capacitance positioning result and a mutual capacitance detecting result respectively; obtaining a mutual capacitance positioning result according to the mutual capacitance detecting result; and determining a location of the touch point according to the self-capacitance positioning result and the mutual capacitance positioning result.
With the method for positioning a touch point on a touch screen according to embodiments of the present disclosure, by detecting the self-capacitance and the mutual capacitance of the touch screen simultaneously, the water interference and the charger interference are avoided, thus greatly improving a waterproof performance. Moreover, by determining the mutual capacitance
positioning coordinate as the location of the touch point, a multi-touch is obtained. Furthermore, frequencies of chargers are not required to be adjusted during the production, thus improving the production efficiency, broadening the scope of applications and reducing the cost.
According to embodiments of a second broad aspect of the present disclosure, there is provided an apparatus for positioning a touch point on a touch screen. The apparatus for positioning a touch point on a touch screen comprises a first detecting module, configured to detect a self-capacitance of a sensor in the touch screen to obtain a self-capacitance positioning result; a second detecting module, configured to detect a mutual capacitance of the sensor in the touch screen to obtain a mutual capacitance detecting result; an obtaining module, configured to obtain a mutual capacitance positioning result according to the mutual capacitance detecting result; a determining module, configured to determine a location of the touch point according to the self-capacitance positioning result and the mutual capacitance positioning result. Detecting the self-capacitance by the first detecting module is simultaneous with detecting the mutual capacitance by the second detecting module.
With the apparatus for positioning a touch point on a touch screen according to embodiments of the present disclosure, by detecting the self-capacitance of the touch screen by the first detecting module and detecting the mutual capacitance of the touch screen by the second detecting module simultaneously to obtain the self-capacitance positioning result and the mutual capacitance positioning result respectively, the water interference and the charger interference are avoided, thus greatly improving a waterproof performance. Moreover, by determining the mutual capacitance positioning point as the location of the touch point by the positioning module, a multi-touch is obtained. Furthermore, a production efficiency is improved and a cost is reduced.
Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the accompanying drawings, in which:
Fig. 1 is a schematic diagram illustrating a connection of a touch screen and an apparatus for detecting a touch point thereon according to an embodiment of the present disclosure;
Fig. 2 is a schematic diagram of a capacitor structure formed by a row sensor and a column sensor according to an embodiment of the present disclosure;
Fig. 3 is a flow chart of a method for positioning a touch point on a touch screen according to an embodiment of the present disclosure;
Fig. 4 is a schematic diagram of an apparatus for positioning a touch point on a touch screen according to an embodiment of the present disclosure; Fig. 5 is a schematic diagram of an apparatus for positioning a touch point on a touch screen according to another embodiment of the present disclosure.
DETAILED DESCRIPTION
Reference will be made in detail to embodiments of the present disclosure. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions. The embodiments described herein with reference to drawings are explanatory, illustrative, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure.
The following disclosure provides a plurality of embodiments for implementing different structures of the present disclosure. In order to simply the present disclosure, the elements and dispositions in special embodiments will be described in the following. Surely, the elements and dispositions are explanatory, but not used to limit the present disclosure. In addition, repeated numbers and/or letters may be referred to in different embodiments of the present disclosure, which is for the purpose of simplification and clarity, and the repeated numbers and/or letters themselves do not indicate the relation between each of the described embodiments and/or dispositions. Moreover, embodiments of the present disclosure provide a plurality of processing and material, however those having the ordinary skills in the related art should recognize the applicability of other processing and materials. Further, in the description of the present disclosure, a structure in which a first feature is "on" a second feature may include an embodiment in which the first feature directly contacts the second feature, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature so that the first feature does not directly contact the second feature, unless otherwise specified.
In the description of the present disclosure, unless specified or limited otherwise, it should be noted that, terms "mounted," "connected," "coupled," and "fastened" may be understood broadly, such as permanent connection or detachable connection, electronic connection or mechanical connection, direct connection or indirect connection via intermediary, inner communication or interaction between two elements. These having ordinary skills in the art should understand the specific meanings in the present disclosure according to specific situations.
With reference to the following descriptions and drawings, these and other aspects of
embodiments of the present disclosure will be transparent. In these descriptions and drawings, explanatory embodiments have been shown and described to illustrate some modes of implementing the theory in embodiments of the present disclosure, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.
In the following, a method for positioning a touch point on a touch screen will be described with reference to Figs. 1-3.
As shown in Figs. 1 and 2, first, a structure of the touch screen according to an embodiment of the present disclosure and a capacitor detected by the method for positioning the touch point on the touch screen according to an embodiment of the present disclosure are briefly introduced as follows. As shown in Fig. 1, the touch screen according to the present disclosure comprises n row sensors (i.e., XI, Χ2,··· Xn) and n column sensors (i.e., Yl, Υ2,··· Yn). Fig. 2 shows a capacitor structure formed by the row sensor XI and the column sensor Yl, in which CI is a self-capacitance of an induced channel of a row sensor, and C2 is a self-capacitance of an induced channel of a column sensor. C3 is a mutual capacitance formed by the row sensor XI and the column sensor Yl, i.e. a capacitor formed by a self-capacitance sensor and a sensor perpendicular to the self-capacitance sensor. The row sensors and the column sensors are connected with a capacitance detecting module 101 respectively. And detected data is transmitted to a host computer 102 via the capacitance detecting module 101. In the embodiment of the present disclosure, by detecting changes of the self-capacitance CI, the self-capacitance C2 and the mutual capacitance C3, a location of the touch point is determined.
As shown in Fig. 3, the method for positioning the touch point on the touch screen according to embodiments of the present disclosure comprises following steps. At step SI, a self-capacitance and a mutual capacitance of a sensor in the touch screen are detected simultaneously to obtain a self-capacitance positioning result and a mutual capacitance detecting result respectively.
In an embodiment of the present disclosure, during a self-capacitance detection, a charge-discharge are required in order to detect the induced channel formed by sensors. In the embodiment, the charge-discharge during the self-capacitance detection is implemented in a form of square wave. Since a transmitting terminal may be excited also in the form of square wave during a mutual capacitance detection, when the charge-discharge is in process, the mutual capacitance may be excited meanwhile, that is, the self-capacitance and the mutual capacitance are detected simultaneously.
In an embodiment of the present disclosure, there are a plurality of row sensors and a plurality of column sensors in the touch screen, and the plurality of row sensors and the plurality of column sensors are detected for detecting the self-capacitance and the mutual capacitance. Specifically, detecting the self-capacitance of the touch screen to obtain a self-capacitance positioning result may comprise: detecting a first sensing value of a row sensor when the row sensor is excited, and then determining a row corresponding to a row sensor having the first sensing value larger than a predetermined value as a self-capacitance positioning row; and detecting a second sensing value of a column sensor when the column sensor is excited, and then determining a column corresponding to a column sensor having the second sensing value larger than the predetermined value as a self-capacitance positioning column. For example, sensing values of row sensors XI to Xn are detected when the row sensors XI to Xn are excited, and if row sensors X5, X6 and X9 have the sensing values larger than a predetermined value, rows corresponding to the row sensors X5, X6 and X9 are determined as the self-capacitance positioning rows. Likewise, sensing values of column sensors Yl to Yn are detected when the column sensors Yl to Yn are excited, and if the column sensors Y4, Y7 and Y9 have the sensing values larger than the predetermined value, columns corresponding to the column sensors Y4, Y7 and Y9 are determined as the self-capacitance positioning columns. Therefore, the self-capacitance positioning result is coordinates of intersection points between the self-capacitance positioning rows and the self-capacitance positioning columns.
In the embodiment of the present disclosure, the square wave adopted in the process of the charge-discharge during the self-capacitance detection is also used to excite the mutual capacitance detection, that is, when detecting a self-capacitance, a mutual capacitance is detected at the same time. Specifically, detecting a mutual capacitance of a sensor in the touch screen to obtain a mutual capacitance detecting result may comprise: detecting a third sensing value of each of a plurality of column sensors when a row sensor is excited; and determining an intersection point between a column corresponding to a column sensor having the third sensing value larger than the predetermined value and a row corresponding to a correspondingly excited row sensor as a mutual capacitance positioning point. Alternatively, detecting a mutual capacitance of a sensor in the touch screen to obtain a mutual capacitance detecting result may comprise: detecting a fourth sensing value of each of a plurality of row sensors when a column sensor is excited; and determining an intersection point between a row corresponding to a row sensor having the fourth
sensing value larger than the predetermined value and a column corresponding to a correspondingly excited column sensor as a mutual capacitance positioning point. For example, sensing values of the column sensors Yl to Yn are detected when the row sensor XI is excited, and if the column sensors Yl, Y3, Y5 and Y8 have the sensing values larger than the predetermined value, intersection points between columns corresponding to the column sensors Yl, Y3, Y5 and Y8 and the row corresponding to the row sensor XI are determined as the mutual capacitance positioning points. And in turn, the sensing values of the column sensors Yl to Yn are detected when the row sensors X2 to Xn are excited respectively, and intersection points between a column corresponding to a column sensor having a sensing value larger than the predetermined value and a row corresponding to the correspondingly excited row sensor as the mutual capacitance positioning points. Alternatively, sensing values of the row sensors XI to Xn are detected when the column sensor Yl is excited, and if the row sensors X3, X5, X6 and X8 have the sensing value larger than the predetermined value, intersection points between rows corresponding to the row sensors X3, X5, X6 and X8 and the column corresponding to the column sensor Yl are determined as the mutual capacitance positioning points. In turn, the sensing values of the row sensors XI to Xn are detected when the column sensors Y2 to Yn are excited respectively, and intersection points between a row corresponding to a row sensor having a sensing value larger than the predetermined value and a column corresponding to the correspondingly excited column sensor are determined as the mutual capacitance positioning points. In one embodiment, a result of the mutual capacitance detection is presented in a form of matrix, i.e., the obtained mutual capacitance positioning points which are the mutual capacitance detecting result are matrix data.
At step S2, a mutual capacitance positioning result is obtained according to the mutual capacitance detecting result.
In one embodiment, a mutual capacitance positioning coordinate is obtained according to the mutual capacitance positioning point. Table 1 is a table illustrating difference values between the matrix data and a reference value (i.e., the sensing value of the sensor when the location corresponding to the sensor is not touched).
Table 1. difference values
Yl Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10 Yll
XI 0 0 0 0 0 0 0 0 0 0 0
X2 0 0 0 0 0 0 0 0 0 0 0
X3 0 0 0 77 0 0 0 0 0 0 0
X4 0 0 208 688 60 0 0 0 0 0 0
X5 0 0 0 148 0 0 0 96 532 67 0
X6 0 0 0 0 0 0 0 112 560 131 0
X7 0 0 0 0 0 0 0 0 0 0 0
X8 0 0 0 0 0 0 0 0 0 0 0
X9 0 416 280 0 0 0 0 0 0 0 0
X10 0 512 616 0 0 64 416 0 0 0 0
Xll 0 0 0 0 0 630 1464 624 0 0 0
X12 0 0 0 0 0 356 1120 477 0 0 0
X13 0 0 0 0 0 0 0 0 0 0 0
X14 0 0 0 0 0 0 0 0 0 0 0
X15 0 0 0 0 0 0 0 0 0 0 0
X16 0 0 0 0 0 0 0 0 0 0 0
X17 0 0 0 0 0 0 0 0 0 0 0
X18 0 0 0 0 0 0 0 0 0 0 0
X19 0 0 0 0 0 0 0 0 0 0 0
X20 0 0 0 0 0 0 0 0 0 0 0
In one embodiment, when the difference value is larger than the predetermined value (for example, 500), the location corresponding to the difference value is determined as the location touched by the finger. As shown in Table 1, the difference value at the intersection point between row sensor Xll and column sensor Y7 is 1464 and the difference value at the intersection point between row sensor X12 and column sensor Y7 is 1120, so these two intersection points are points touched by the finger. With a matrix coordinate algorithm, a coordinate corresponding to each finger can be obtained, i.e., a mutual capacitance positioning coordinate is obtained. The matrix coordinate algorithm is a known technology by those skilled in the art and will be omitted herein.
At step S3, a location of the touch point is determined according to the self-capacitance positioning result and the mutual capacitance positioning result.
Specifically, a row of the mutual capacitance positioning coordinate is compared with the self-capacitance positioning row or a column of the mutual capacitance positioning coordinate is compared with the self-capacitance positioning column. If the row of the mutual capacitance positioning coordinate is the same as the self-capacitance positioning row or the column of the mutual capacitance positioning coordinate is the same as the self-capacitance positioning column, the mutual capacitance positioning point is determined as the location of the touch point.
It should be noted that, since there is an error during detection or calculation, when the row of the mutual capacitance positioning coordinate is approximately the same as the self-capacitance positioning row or the column of the mutual capacitance positioning coordinate is approximately the same as the self-capacitance positioning column, the mutual capacitance positioning coordinate
can be determined as the touch point.
With the method for positioning a touch point on a touch screen according to embodiments of the present disclosure, by detecting the self-capacitance and the mutual capacitance of the touch screen simultaneously, the water interference and the charger interference are avoided, thus greatly improving a waterproof performance. Moreover, by determining the mutual capacitance positioning coordinate as the location of the touch point, a multi-touch is obtained. Furthermore, frequencies of chargers are not required to be adjusted during the production, thus improving the production efficiency, broadening the scope of applications and reducing the cost.
According to embodiments of a second broad aspect of the present disclosure, there is provided an apparatus for positioning a touch point on a touch screen. As shown in Fig. 4, the apparatus comprises a first detecting module 401, a second detecting module 402, an obtaining module 403 and a determining module 404. The first detecting module 401 is configured to detect a self-capacitance of a sensor in the touch screen to obtain a self-capacitance positioning result. The second detecting module 402 is configured to detect a mutual capacitance of the sensor in the touch screen to obtain a mutual capacitance detecting result. One terminal of the first detecting module 401 and one terminal of the second detecting module 402 are connected with a circuit model 100 of a capacitive touch screen. Detecting the self-capacitance by the first detecting module 401 is simultaneous with detecting the mutual capacitance by the second detecting module 402. The obtaining module 403 is configured to obtain a mutual capacitance positioning result according to the result of detecting the mutual capacitance. The determining module 404 is configured to determine a location of the touch point according to the self-capacitance positioning result and the mutual capacitance positioning result. It should be noted that, the first detecting module 401 and the second detecting module 402 are corresponding to the capacitance detecting module 101 shown in Fig. 1, that is, the capacitance detecting module 101 may comprise the first detecting module 401 and the second detecting module 402. In addition, the host computer 102 shown in Fig. 1 may comprise the obtaining module 403 and the determining module 404.
In one embodiment, there are a plurality of row sensors and a plurality of column sensors provided in the touch screen, and the plurality of row sensors and the plurality of column sensors are detected for detecting the self-capacitance and the mutual capacitance.
Further, as shown in Fig. 5, the apparatus further comprises an exciting module 405 configured to excite the plurality of row sensors and the plurality of column sensors respectively.
The first detecting module 401 comprises: a first row detecting unit 4011 and a first column detecting unit 4012.
The first row detecting unit 4011 is configured to detect a first sensing value of the row sensor when the row sensor is excited by the exciting module 405, and to determine a row corresponding to the row sensor having the first sensing value larger than a predetermined value as a self-capacitance positioning row. The first column detecting unit 4012 is configured to detect a second sensing value of the column sensor when the column sensor is excited by the exciting module 405, and to determine a column corresponding to the column sensor having the second sensing value larger than the predetermined value as a self-capacitance positioning column. Thus, the first detecting module 401 obtains the self-capacitance positioning result according to the self-capacitance positioning row and the self-capacitance positioning column. For example, when the exciting module 405 excites each of row sensors Xl-Xn, the first row detecting unit 4011 detects the first sensing values of the row sensors Xl-Xn, and if the first sensing values of the row sensors X5, X6 and X9 are larger than the predetermined value, the first row detecting unit 4011 determines the rows corresponding to the row sensors X5, X6 and X9 as the self-capacitance positioning rows. When the exciting module 405 excites each of column sensors Yl-Yn, the first column detecting unit 4012 detects the second sensing values of the column sensors Yl-Yn, and if the second sensing values of the column sensors Y4, Y7 and Y9 are larger than the predetermined value, the first column detecting unit 4012 determines the columns corresponding to the column sensors Y4, Y7 and Y9 as the self-capacitance positioning columns. Thus, the first detecting module 401 determines coordinates of the nine intersection points between the row sensors X5, X6 and X9 and the column sensors Y4, Y7 and Y9 as the self-capacitance positioning result.
The second detecting module 402 comprises a second row detecting unit 4021 and a second column detecting unit 4022. The second row detecting unit 4021 is configured to detect a third sensing value of each of the plurality of column sensors when each of the plurality of row sensors is excited by the exciting module 405, and to determine an intersection point between a column corresponding to a column sensor having the third sensing value larger than the predetermined value and a row corresponding to a correspondingly excited row sensor as a mutual capacitance positioning point. The second column detecting unit 4022 is configured to detect a fourth sensing value of each of the plurality of row sensors when each of the plurality of column sensors is excited by the exciting module 405, and to determine an intersection point between a row
corresponding to a row sensor having the fourth sensing value larger than the predetermined value and a column corresponding to a correspondingly excited column sensor as a mutual capacitance positioning point. For example, when the exciting module 405 excites the row sensor XI, the second column detecting unit 4022 detects the third sensing values of the column sensors Yl-Yn, and if the column sensors Yl, Y3, Y5 and Y8 have the third sensing value larger than the predetermined value, intersection points between columns corresponding to the column sensors Yl, Y3, Y5, Y8 and the row corresponding to the row sensor XI are determined as mutual capacitance positioning points. In turn, the exciting module 405 excites the row sensors X2-Xn respectively, the second column detecting unit 4022 detects third sensing values of the column sensors Yl-Yn when each of the row sensors X2-Xn is excited, and intersection points between columns corresponding to the column sensors having the third sensing value larger than the predetermined value and the row corresponding to the correspondingly excited row sensor are determined as mutual capacitance positioning points. Alternatively, when the exciting module 405 excites the column sensor Yl, the second row detecting unit 4021 detects fourth sensing values of the row sensors Xl-Xn, and if the row sensors X3, X5, X6 and X8 have the fourth sensing values larger than the predetermined value, intersection points between rows corresponding to the row sensors X3, X5, X6, X8 and the column corresponding to the column sensor Yl are determined as mutual capacitance positioning points. In turn, the exciting module 405 excites the column sensors Y2-Yn respectively, the second row detecting unit 4021 detects the fourth sensing values of the row sensors Xl-Xn when each of the column sensors Y2-Yn is excited, and intersection points between rows corresponding to the row sensors having the fourth sensing values larger than the predetermined value and the column corresponding to the correspondingly excited column sensor are determined as mutual capacitance positioning points.
In one embodiment of the present disclosure, after obtaining the mutual capacitance positioning points, the obtaining module 403 obtains mutual capacitance positioning coordinates, i.e. the mutual capacitance positioning result, according to the mutual capacitance positioning points.
Finally, the determining module 404 determines the location of the touch point according to the mutual capacitance positioning result and the self-capacitance positioning result. Specifically, the determining module 404 compares a row of the mutual capacitance positioning coordinate with the self-capacitance positioning row, compares a column of the mutual capacitance positioning
coordinate with the self-capacitance positioning column, and determines the mutual capacitance positioning point as the location of the touch point when the row of the mutual capacitance positioning coordinate is the same as the self-capacitance positioning row or the column of the mutual capacitance positioning coordinate is the same as the self-capacitance positioning column. It should be noted that, since there is an error during detection or calculation, when the row of the mutual capacitance positioning coordinate is approximately the same as the self-capacitance positioning row and the column of the mutual capacitance positioning coordinate is approximately the same as the self-capacitance positioning column, the mutual capacitance positioning point can be determined as the location of the touch point.
With the apparatus for positioning a touch point on a touch screen according to embodiments of the present disclosure, by detecting the self-capacitance of the touch screen by the first detecting module and detecting the mutual capacitance of the touch screen by the second detecting module simultaneously to obtain the self-capacitance positioning result and the mutual capacitance positioning result respectively, the water interference and the charger interference are avoided, thus greatly improving a waterproof performance. Moreover, by determining the mutual capacitance positioning point as the location of the touch point by the positioning module, a multi-touch is obtained. Furthermore, a production efficiency is improved and a cost is reduced.
Any procedure or method described in the flow charts or described in any other way herein may be understood to comprise one or more modules, portions or parts for storing executable codes that realize particular logic functions or procedures. Moreover, advantageous embodiments of the present disclosure comprises other implementations in which the order of execution is different from that which is depicted or discussed, including executing functions in a substantially simultaneous manner or in an opposite order according to the related functions. This should be understood by those skilled in the art which embodiments of the present disclosure belong to.
The logic and/or step described in other manners herein or shown in the flow chart, for example, a particular sequence table of executable instructions for realizing the logical function, may be specifically achieved in any computer readable medium to be used by the instruction execution system, device or equipment (such as the system based on computers, the system comprising processors or other systems capable of obtaining the instruction from the instruction execution system, device and equipment and executing the instruction), or to be used in combination with the instruction execution system, device and equipment. As to the specification,
"the computer readable medium" may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment. More specific examples of the computer readable medium comprise but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or a flash memory), an optical fiber device and a portable compact disk read-only memory (CDROM). In addition, the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in a electric manner, and then the programs may be stored in the computer memories.
It is understood that each part of the present disclosure may be realized by the hardware, software, firmware or their combination. In the above embodiments, a plurality of steps or methods may be realized by the software or firmware stored in the memory and executed by the appropriate instruction execution system. For example, if it is realized by the hardware, likewise in another embodiment, the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application- specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.
Those skilled in the art shall understand that all or parts of the steps in the above exemplifying method of the present disclosure may be achieved by commanding the related hardware with programs. The programs may be stored in a computer readable storage medium, and the programs comprise one or a combination of the steps in the method embodiments of the present disclosure when run on a computer.
In addition, each function cell of the embodiments of the present disclosure may be integrated in a processing module, or these cells may be separate physical existence, or two or more cells are integrated in a processing module. The integrated module may be realized in a form of hardware or in a form of software function modules. When the integrated module is realized in a form of software function module and is sold or used as a standalone product, the integrated module may
be stored in a computer readable storage medium.
The storage medium mentioned above may be read-only memories, magnetic disks or CD, etc.
Reference throughout this specification to "an embodiment," "some embodiments," "an example," "a specific example," or "some examples," means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. The appearances of the phrases throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.
Claims
1. A method for positioning a touch point on a touch screen, comprising:
detecting simultaneously a self-capacitance and a mutual capacitance of a sensor in the touch screen to obtain a self-capacitance positioning result and a mutual capacitance detecting result respectively;
obtaining a mutual capacitance positioning result according to the mutual capacitance detecting result; and
determining a location of the touch point according to the self-capacitance positioning result and the mutual capacitance positioning result.
2. The method according to claim 1, wherein the sensor comprises a plurality of row sensors and a plurality of column sensors.
3. The method according to claim 2, wherein detecting a self-capacitance of a sensor in the touch screen to obtain a self-capacitance positioning result comprises:
detecting a first sensing value of a row sensor when the row sensor is excited, determining a row corresponding to a row sensor having the first sensing value larger than a predetermined value as a self-capacitance positioning row; and
detecting a second sensing value of a column sensor when the column sensor is excited, determining a column corresponding to a column sensor having the second sensing value larger than the predetermined value as a self-capacitance positioning column.
4. The method according to claim 3, wherein detecting a mutual capacitance of a sensor in the touch screen to obtain a mutual capacitance detecting result comprises:
detecting a third sensing value of each of a plurality of column sensors when a row sensor is excited; and
determining an intersection point between a column corresponding to a column sensor having the third sensing value larger than the predetermined value and a row corresponding to a correspondingly excited row sensor as a mutual capacitance positioning point.
5. The method according to claim 3, wherein detecting a mutual capacitance of a sensor in the touch screen to obtain a mutual capacitance detecting result comprises:
detecting a fourth sensing value of each of a plurality of row sensors when a column sensor is excited; and
determining an intersection point between a row corresponding to a row sensor having the fourth sensing value larger than the predetermined value and a column corresponding to a correspondingly excited column sensor as a mutual capacitance positioning point.
6. The method according to claim 4 or 5, wherein obtaining a mutual capacitance positioning
result according to the mutual capacitance detecting result comprises:
obtaining a mutual capacitance positioning coordinate according to the mutual capacitance positioning point.
7. The method according to claim 6, wherein determining a location of the touch point according to the self-capacitance positioning result and the mutual capacitance positioning result comprises:
determining whether a row of the mutual capacitance positioning coordinate is the same as the self-capacitance positioning row, or whether a column of the mutual capacitance positioning coordinate is the same as the self-capacitance positioning column; and
if yes, determining the mutual capacitance positioning coordinate as the location of the touch point.
8. An apparatus for positioning a touch point on a touch screen, comprising:
a first detecting module, configured to detect a self-capacitance of a sensor in the touch screen to obtain a self-capacitance positioning result;
a second detecting module, configured to detect a mutual capacitance of the sensor in the touch screen to obtain a mutual capacitance detecting result;
an obtaining module, configured to obtain a mutual capacitance positioning result according to the mutual capacitance detecting result;
a determining module, configured to determine a location of the touch point according to the self-capacitance positioning result and the mutual capacitance positioning result;
wherein detecting the self-capacitance by the first detecting module is simultaneous with detecting the mutual capacitance by the second detecting module.
9. The apparatus according to claim 8, wherein the sensor comprises a plurality of row sensors and a plurality of column sensors.
10. The apparatus according to claim 9, further comprising:
an exciting module, configured to excite a plurality of row sensors and a plurality of column sensors respectively.
11. The apparatus according to claim 10, wherein the first detecting module comprises:
a first row detecting unit, configured to detect a first sensing value of the row sensor when the row sensor is excited, and to determine a row corresponding to the row sensor having the first sensing value larger than a predetermined value as a self-capacitance positioning row;
a first column detecting unit, configured to detect a second sensing value of the column sensor when the column sensor is excited, and to determine a column corresponding to the column sensor having the second sensing value larger than the predetermined value as a self-capacitance positioning column.
12. The apparatus according to claim 10, wherein the second detecting module comprises: a second row detecting unit, configured to detect a third sensing value of each of the plurality of column sensors when each of the plurality of row sensors is excited, and to determine an intersection point between a column corresponding to a column sensor having the third sensing value larger than the predetermined value and a row corresponding to a correspondingly excited row sensor as a mutual capacitance positioning point; or
a second column detecting unit, configured to detect a fourth sensing value of each of the plurality of row sensors when each of the plurality of column sensors is excited, and to determine an intersection point between a row corresponding to a row sensor having the fourth sensing value larger than the predetermined value and a column corresponding to a correspondingly excited column sensor as a mutual capacitance positioning point.
13. The apparatus according to claim 11 or 12, wherein the obtaining module is configured to obtain a mutual capacitance positioning coordinate according to the mutual capacitance positioning point.
14. The apparatus according to claim 13, wherein the determining module is configured to determine the mutual capacitance positioning coordinate as the location of the touch point when a row of the mutual capacitance positioning coordinate is the same as the self-capacitance positioning row or a column of the mutual capacitance positioning coordinate is the same as the self-capacitance positioning column.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310053585.9 | 2013-02-19 | ||
| CN201310053585.9A CN103995626B (en) | 2013-02-19 | 2013-02-19 | A kind of touch independent positioning method and device for touch-screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014127716A1 true WO2014127716A1 (en) | 2014-08-28 |
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ID=51309812
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2014/072257 WO2014127716A1 (en) | 2013-02-19 | 2014-02-19 | Method and apparatus for positioning touch point on touch screen |
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| CN (1) | CN103995626B (en) |
| WO (1) | WO2014127716A1 (en) |
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| CN103995626A (en) | 2014-08-20 |
| CN103995626B (en) | 2018-05-29 |
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