WO2019006667A1 - 电子设备、触摸检测电路以及触摸屏的基准值的更新方法 - Google Patents

电子设备、触摸检测电路以及触摸屏的基准值的更新方法 Download PDF

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Publication number
WO2019006667A1
WO2019006667A1 PCT/CN2017/091725 CN2017091725W WO2019006667A1 WO 2019006667 A1 WO2019006667 A1 WO 2019006667A1 CN 2017091725 W CN2017091725 W CN 2017091725W WO 2019006667 A1 WO2019006667 A1 WO 2019006667A1
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WIPO (PCT)
Prior art keywords
touch
value
data frames
touch screen
processor
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PCT/CN2017/091725
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English (en)
French (fr)
Inventor
杨威
彭永豪
刘松松
姜海宽
Original Assignee
深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to EP17898337.5A priority Critical patent/EP3454190A4/en
Priority to PCT/CN2017/091725 priority patent/WO2019006667A1/zh
Priority to CN201780000621.1A priority patent/CN109643200B/zh
Priority to US16/122,332 priority patent/US11262876B2/en
Publication of WO2019006667A1 publication Critical patent/WO2019006667A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • 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
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • 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

Definitions

  • the present application relates to the field of touch screen technologies, and in particular, to an electronic device, a touch detection circuit, and a method for updating a reference value of a touch screen.
  • the touch screen Before detecting the user operation on the touch screen, the touch screen generally establishes a reference original value, and the original value is obtained by sampling the touch control chip, and the original value of the reference reflects the initial state of each sensing node of the capacitive sensor.
  • a touch object for example, a finger, a stylus, or the like that can change the inductive capacitance
  • clicks on the touch screen the operation such as scribing changes the capacitance of the corresponding position sensing node, and the original value obtained at this time is obtained.
  • the current original value is obtained by subtracting the current original value from the original value of the reference, and the difference can reflect the amount of capacitance change caused by the touch object at the operating position, and the touch coordinates can be calculated and reported according to the difference.
  • the inventors have found that at least the following problems exist in the prior art: when the temperature rises or falls, the original value of the capacitive touch screen changes correspondingly due to the temperature drift characteristic of the capacitive sensor;
  • the touch coordinates will be reported normally at the beginning, but then the elimination point will occur.
  • the elimination point means that the touch object is on the touch screen.
  • the touch control chip does not report the coordinates; the reason for the elimination phenomenon is the capacitive sensing of the position of the finger when the user just puts the finger on the touch screen.
  • the original value of the node will decrease, and the positive difference can be obtained by subtracting the current original value from the reference original value.
  • the touch control chip will calculate and report the coordinates; however, in a severe cold environment, the touch screen temperature Far below the temperature of the human finger, when the finger is continuously placed at the same position of the touch screen, the temperature of the position will gradually increase due to the heat conducted by the finger, and the original value of the capacitive sensing node at the position is gradually increased, thereby The difference is gradually reduced.
  • the difference is less than a certain threshold, the position touched by the finger will appear to be eliminated.
  • An embodiment of the present invention provides an electronic device, a touch detection circuit, and a method for updating a reference value of a touch screen, such that the difference between the reference value and the sensing value of the continuous touch area does not increase with the heat transferred by the touch object. And reduce, so as to avoid the phenomenon of low temperature elimination.
  • An embodiment of the present application provides a method for updating a reference value of a touch screen, including: acquiring a temperature value of an environment in which the touch screen is located; determining that the acquired temperature value is less than a preset temperature threshold, and determining the touch screen Collecting N data frames of the continuous touch area when there is a continuous touch area; calculating N feature values of the N data frames; updating N reference values corresponding to the N data frames according to the N feature values; wherein, N>1 And N is an integer.
  • the embodiment of the present application further provides a touch detection circuit, characterized in that: a processor and a memory, the processor is connected to the memory and a touch screen; the processor is configured to acquire a temperature value of an environment in which the touch screen is located; and the processor is further configured to determine The obtained temperature value is less than a preset temperature threshold, and when it is determined that there is a continuous touch area on the touch screen, the N data frames of the continuous touch area are collected through the touch screen; the processor is further configured to calculate N feature values of the N data frames, And updating N reference values corresponding to the N data frames according to the N feature values; wherein N>1 and N are integers. .
  • the embodiment of the present application further provides an electronic device, including: the above touch detection circuit.
  • the embodiment of the present application further provides an electronic device, which is applied to the method for updating a reference value of the touch screen, and the electronic device includes: a temperature sensor, a touch screen, and a touch chip.
  • the touch chip is connected to the temperature sensor and the touch screen; the temperature sensor is used to obtain the temperature value of the environment where the touch screen is located; the touch chip is used to determine that the temperature value of the environment where the touch screen is located is less than a preset temperature threshold, and determining that there is a continuous touch area on the touch screen
  • the N data frames of the continuous touch area are collected by the touch screen; the touch chip is further configured to calculate N feature values of the N data frames, and update N reference values corresponding to the N data frames according to the N feature values; wherein N>1 and N is an integer.
  • the N data frames of the continuous touch area are collected, and N of the N data frames are utilized.
  • the feature value is used to update its corresponding N reference values such that the reference value of the continuous touch region changes with the change of the ambient temperature, because the difference between the reference value and the sensed value of the continuous touch region is not caused by the heat transferred by the touch object.
  • the temperature is reduced to reduce the occurrence of low temperature elimination.
  • determining that there is a continuous touch area on the touch screen comprises: collecting M data frames of the touch screen when the touch operation is detected; wherein, the M data frames are collected before the N data frames; according to the M data frames Sensing values of the sensing nodes of each data frame, identifying sensing nodes in a touch state in each data frame; determining whether the sensing nodes in the touch state in the adjacent two data frames in the M data frames match When the judgment result is a match, it is determined that there is a continuous touch area; one data frame is selected from the M data frames, and an area formed by the sensing node in the touch state in the selected data frame is set as the continuous touch area.
  • This embodiment provides a specific method for determining that there is a continuous touch area on the touch screen.
  • an area formed by the sensing node in the touch state in the selected data frame is set as After continuously touching the area, the method further includes: expanding the continuous touch area according to a preset rule.
  • the continuous touch area is expanded according to a preset rule, and the touch area is increased, thereby avoiding an error caused by the touch object slightly changing the touch position.
  • N reference values corresponding to the N data frames are updated according to the N feature values, and the calculation formula is:
  • Ref represents the reference value
  • FeatureData represents the feature value
  • ⁇ is the empirical coefficient of the reference update.
  • the N reference values corresponding to the N data frames are updated according to the N eigenvalues, and specifically, the N eigenvalues corresponding to the N data frames are separately smoothed; and the smoothed filtered N eigenvalues are updated. N reference values corresponding to N data frames.
  • the variation of the feature value caused by the jitter is filtered out, and the accuracy of updating the reference value is improved.
  • FeatureData(j+1) ⁇ *FeatureData(j+1)+(1- ⁇ )FeatureData(j)
  • FeatureData represents the eigenvalue
  • ⁇ is the empirical coefficient of the smoothing filter
  • j M, M+1, M+2, ... M+N-1.
  • the touch screen is applied to an electronic device; and the temperature value acquisition manner of the environment in which the touch screen is located is specifically: obtaining a temperature value by using a temperature sensor disposed in the electronic device.
  • This embodiment provides a specific manner of obtaining a temperature value of an environment in which the touch screen is located.
  • the acquiring manner of the temperature value of the environment in which the touch screen is located specifically includes: acquiring original detection data collected by the touch screen in an untouched state in the environment; calculating a feature value of the touch screen in the environment according to the original detection data; Corresponding relationship with the preset value of the temperature value, obtaining the feature value pair
  • the temperature value should be.
  • This embodiment provides another specific method for obtaining a temperature value, which can obtain a temperature value without using a temperature sensor, requires less hardware, and has low hardware configuration requirements for an electronic device, so that it can be applied to more electronic devices. in.
  • calculating the N feature values of the N data frames includes: calculating an average value or a median value of the sensing values of the sensing nodes in the N data frames as the N feature values.
  • This embodiment provides a specific calculation method of the feature value, and the average value or the median value of the sensing values of each sensing node has better stability as the feature value.
  • FIG. 1 is a specific flowchart of a method for updating a reference value of a touch screen according to a first embodiment of the present application
  • FIG. 2 is a graph showing a difference between a reference value and an inductive value after the reference value is updated according to the first embodiment of the present application;
  • FIG. 3 is a specific flowchart of a method for updating a reference value of a touch screen according to a second embodiment of the present application
  • FIG. 4 is a schematic diagram of a capacitive touch screen according to a second embodiment of the present application.
  • Figure 5 is a temperature-original value characteristic diagram according to a second embodiment of the present application.
  • FIG. 6 is a specific flow of a method for updating a reference value of a touch screen according to a third embodiment of the present application.
  • FIG. 7 is a data diagram of a difference between a partial reference value and an inductive value of a touch screen according to a third embodiment of the present application.
  • FIG. 8 is an attenuation trend diagram of a difference between a reference value and an inductive value in a continuous touch region according to a third embodiment of the present application.
  • FIG. 9 is a specific flowchart of a method for updating a reference value of a touch screen according to a fourth embodiment of the present application.
  • FIG. 10 is a specific flowchart of a method for updating a reference value of a touch screen according to a fifth embodiment of the present application.
  • FIG. 11 is a graph showing changes in eigenvalues before and after filtering according to a fifth embodiment of the present application.
  • FIG. 12 is a block diagram showing a touch detection circuit according to a sixth embodiment of the present application.
  • FIG. 13 is a block schematic diagram of a touch detection circuit according to a seventh embodiment of the present application.
  • the first embodiment of the present application relates to a method for updating a reference value of a touch screen, which is applied to an electronic device.
  • the electronic device includes at least a temperature sensor, a touch screen, and a touch chip, such as a mobile phone, a tablet computer, or the like.
  • the specific flow of the method for updating the reference value of the touch screen is as shown in FIG. 1.
  • Step 101 Acquire a temperature value of an environment where the touch screen is located.
  • a temperature sensor is disposed in the electronic device, and the touch screen is acquired by the temperature sensor
  • the temperature value of the environment is not limited to this.
  • Step 102 Determine whether the temperature value of the environment in which the acquired touch screen is located is less than a preset temperature threshold. If yes, go to step 103; if no, it will end directly.
  • the temperature threshold can be obtained according to a low temperature environment experiment.
  • an ambient temperature is preset, and a finger or other touch object is pressed against the touch screen, and the temperature of the touch screen is gradually increased to observe whether the phenomenon of elimination occurs.
  • the touch chip determines whether the temperature value of the environment is less than the temperature threshold; when it is determined that the temperature value of the environment is less than the temperature threshold, the process proceeds to step 103; otherwise, the touch screen is not prone to occur at the ambient temperature of the touch screen. Eliminate the phenomenon.
  • Step 103 Determine whether there is a continuous touch area on the touch screen. If yes, go to step 104; if no, it will end directly.
  • the touch chip determines whether there is a continuous touch area on the touch screen, and when the touch screen is determined to exist, When the area is continuously touched, the process proceeds to step 104; otherwise, it indicates that the user does not continuously place the finger on the same position of the touch screen, and the phenomenon of elimination is not easy to occur.
  • Step 104 Acquire N data frames of the continuous touch area.
  • the touch chip collects N data frames of the continuous touch area through the touch screen; wherein N>1 and N is an integer.
  • Step 105 Calculate N feature values of N data frames.
  • the touch chip calculates N feature values according to the collected N data frames.
  • the average value or the median value of the sensing values of the sensing nodes of the touch area of the touch screen is taken as the feature value, but the present invention is not limited thereto, and may also be characterized by the sensing value of a certain sensing node. Value; or the maximum or minimum value of the sensing value of all the sensing nodes of a touch area on the touch screen as the feature value; or the maximum or minimum value of the sensing value of all the sensing nodes on the entire touch screen as the feature value; Taking the average value or the median value of the sensing values of the sensing nodes of the touched area of the touch screen as the characteristic value has better stability with respect to other types.
  • Step 106 Update N reference values corresponding to N data frames according to the N feature values.
  • the touch chip locally updates the reference value in the continuous touch area according to the change trend of the feature value of the continuous touch area, refer to FIG. 2, and the difference curve between the reference value and the sensed value after the reference value is updated. It can be seen from the figure that the difference after the reference value update from the ninth data frame is kept at about 140; the difference value of the eigenvalue can be used to describe the trend of the eigenvalue, which will continue to be within the touch area.
  • the reference value is added to all the reference values, and the calculation formula for the reference value is:
  • FeatureData(M+K*n)-FeatureData(M+K*(n-1)) represents the difference value of the feature value
  • Ref represents the reference value
  • FeatureData represents the feature value
  • ⁇ is the empirical coefficient of the reference update
  • K ⁇ ⁇ 1, 2, 3... ⁇ the magnitude of the K value reflects the speed of the reference update frequency
  • M represents the number of data frames acquired in the continuous touch area.
  • Ref(M+i) Ref(M+K*(n-1))+ ⁇ *(FeatureData(M+K*n)-FeatureData(M+K*(n-1)))
  • ref(11) ref(10), that is, the reference value in the data frame in the interval is replaced with the updated reference value to complete the update of the reference values of the N data frames.
  • step 103 may be performed first, whether the touch screen exists. The touch area is continuously determined, and then steps 101 and 102 are performed to obtain a temperature value of the environment in which the touch screen is located, and it is determined whether the temperature value of the environment in which the touch screen is located is less than a preset temperature threshold.
  • the N data frames of the continuous touch area are collected, and the N features of the N data frames are utilized.
  • the value is updated to the corresponding N reference values, so that the reference value of the continuous touch area changes with the ambient temperature, so that the difference between the reference value and the sensing value of the continuous touch area does not increase with the heat transferred by the touch object. Reduced, avoiding the phenomenon of low temperature elimination.
  • the second embodiment of the present application relates to a method for updating a reference value of a touch screen.
  • the embodiment is substantially the same as the first embodiment.
  • the main difference is that in the first embodiment, the touch screen is acquired by a temperature sensor in the electronic device.
  • the capacitive touch screen generally includes a touch panel and a touch detection circuit.
  • the touch detection circuit includes a processor and a memory, and the processor and the memory can be integrated into the same touch detection chip.
  • the touch panel is a capacitive sensor formed on a substrate.
  • the capacitive sensor generally consists of a driving electrode and a sensing electrode. In a typical mutual capacitive touch screen, each driving electrode and the sensing electrode intersect to form an induction. Node; in Figure 3, five drive electrodes and five sense electrodes are taken as an example to form 25 sensing nodes.
  • the method for updating the reference value of the touch screen in this embodiment is as shown in FIG.
  • the steps 202 to 206 are substantially the same as the steps 102 to 106, and are not described here.
  • the main refinement is: in the embodiment, the step 201 is to obtain the temperature value of the environment in which the touch screen is located, and specifically includes:
  • the capacitive touch screen acquires the original detection data in the current environment and in the untouched state through the capacitive sensor.
  • the processor sends the coding signal of a certain frequency into the driving electrode according to a certain driving manner, and codes the code.
  • the sensing electrode After the signal passes through the capacitive sensor, the sensing electrode returns to the touch screen, and the sensing value of each mutual capacitance sensing node is obtained after the internal ADC conversion and digital signal processing of the touch screen; wherein the original detection data includes the sensing in at least part of the touch area of the touch screen.
  • the sensing value of the node that is, the original detection data may be the sensing value of all sensing nodes on the entire touch screen, or the sensing values of all sensing nodes included in a certain touch area on the touch screen.
  • Table 1 below is a frame of raw data obtained by sequential sampling of the touch control chip, and is an example of a capacitive touch screen having 6 driving electrodes and 16 sensing electrodes.
  • Sub-step 2012 calculates the feature value of the touch screen in the environment according to the original detection data.
  • the processor calculates the feature value of the touch screen in the environment according to the sensing value of each sensing node of the touch area of the touch screen.
  • the method for calculating the feature value is substantially the same as that of step 105, and details are not described herein again.
  • Sub-step 2013 Acquire a temperature value corresponding to the feature value according to a preset correspondence relationship between the feature value and the temperature value.
  • the processor may obtain the temperature value corresponding to the feature value according to the preset correspondence between the feature value and the temperature value.
  • the corresponding relationship between the eigenvalue and the temperature value may be represented by a temperature-original value characteristic curve.
  • this embodiment does not impose any limitation on this; as shown in FIG. 5, it is a temperature-original value characteristic curve of a touch screen, and is simulated by a curve.
  • the temperature value of the current environment is a temperature-original value characteristic curve of a touch screen.
  • this embodiment provides another method for acquiring the temperature value of the environment in which the touch screen is located, and the temperature value can be obtained without using the temperature sensor, and the required hardware is less, and the hardware of the electronic device is The configuration requirements are low so that it can be applied to more electronic devices.
  • the third embodiment of the present application relates to a method for updating a reference value of a touch screen, which is
  • the refinement of the first embodiment is mainly refined in that step 103 is performed to determine whether there is a continuous touch area on the touch screen, and a detailed introduction is made.
  • the method for updating the reference value of the touch screen in this embodiment is as shown in FIG. 6.
  • Step 301, step 302 is substantially the same as step 101 and step 102.
  • Steps 304 to 306 are substantially the same as steps 104 to 106, and are not described here.
  • the main difference is that, in this embodiment, step 303 is performed. Determine whether there is a continuous touch area on the touch screen, including:
  • Sub-step 3031 detecting if there is a touch operation. If yes, go to sub-step 3032; if no, it ends directly.
  • the sub-step 3032 is entered; otherwise, it ends directly.
  • Sub-step 3032 collecting M data frames of the touch screen.
  • the M data frames of the touch screen are collected; wherein the M data frames of the touch screen are collected before the N data frames, that is, during the touch of the touch screen by the user's finger,
  • the collected M data frames are used to determine whether there is a continuous touch area, and then the N data frames are collected for updating the reference value;
  • the M value can be obtained through low temperature environment experiment observation, and the value of M in this embodiment is 9 (detailed details), but this embodiment does not impose any restrictions.
  • Sub-step 3033 Identify, according to the sensing values of the sensing nodes in each of the M data frames, the sensing nodes belonging to the touched state in each data frame.
  • the difference between the reference value and the sensing value of all the sensing nodes in each data frame is calculated according to the sensing values of the sensing nodes in each data frame; and then each difference is compared with the threshold TouchLevel.
  • the sensing node that determines that the difference is greater than the threshold TouchLevel is in a touch state, thereby To identify the sensing node in the touch state in each data frame.
  • Sub-step 3034 determining whether the sensing nodes in the touch state of the adjacent two data frames in the M data frames match. If yes, go to sub-step 3035; if no, it ends directly.
  • the difference between the reference value of the sensing node in the touch state and the sensing value in each data frame is calculated, and according to the difference, whether the touch object is touched on the touch screen and the touch object is calculated If the position range calculated in the adjacent two data frames includes half or more of the same sensing node, the determination result is a match, indicating that there is a continuous touch area, and the sub-step 3035 is entered; otherwise, the description is not There is a continuous touch area, which does not cause low temperature cancellation and ends directly.
  • Sub-step 3035 selecting one data frame from the M data frames, and setting an area formed by the sensing node in the touch state in the selected data frame as the continuous touch area.
  • the first data frame of the M data frames is selected to determine the continuous touch area.
  • the partial difference data formed by the touch screen object on the touch screen in a certain data frame each side
  • the formed area uses this area as the continuous touch area; please refer to FIG.
  • the threshold TouchLevel takes a value of 100.
  • this embodiment does not impose any limitation on this, and can be set according to experience.
  • the present embodiment provides a specific method of determining whether there is a continuous touch area on the touch screen with respect to the first embodiment. It should be noted that this embodiment can also be used as the refinement of the second embodiment, and the same technical effects can be achieved.
  • the fourth embodiment of the present application relates to a method for updating a reference value of a touch screen.
  • the present embodiment is an improvement based on the third embodiment.
  • the main improvement is that, in this embodiment, after determining the continuous touch area, The preset rule will continue to expand the touch area.
  • the method for updating the reference value of the touch screen in this embodiment is as shown in FIG.
  • Steps 401 and 402 are substantially the same as steps 301 and 302.
  • Steps 404 to 406 are substantially the same as steps 304 to 306.
  • Sub-step 4031 to sub-step 4035 are substantially the same as sub-step 3031 to sub-step 3035. This is not described again. The main difference is that in this embodiment, sub-step 4036 is added, as follows:
  • Sub-step 4036 the continuous touch area is expanded according to a preset rule.
  • the continuous touch area is expanded according to a preset rule, for example, an inductive node is expanded on the basis of the outermost sensing node in each direction of the continuous touch area, and the external expansion is performed.
  • the rectangular area formed by the intersection of the straight lines of the inductive nodes is used as the touch area.
  • FIG. 7 Each square corresponds to the sensing node formed by the intersection of the driving electrode and the sensing electrode in FIG. 3, and the dotted line frame indicates the continuous touch area.
  • the outermost sensing nodes are 106, 100, 123, and 132 (the sensing nodes are represented by the difference), and the external sensing nodes are 16, -11, -2, and 8, Therefore, after the expansion, the entire rectangular frame in FIG. 7 is the extended touch area.
  • the continuous touch area is expanded according to a preset rule to increase the touch area, thereby avoiding an error caused by the touch object slightly changing the touch position.
  • the fifth embodiment of the present application relates to a method for updating a reference value of a touch screen.
  • This embodiment is a refinement of the first embodiment.
  • the main refinement is: for step 106: updating N data according to N feature values.
  • the N reference values corresponding to the frame are described in detail.
  • the method for updating the reference value of the touch screen in this embodiment is as shown in FIG.
  • N corresponding N data frames are updated according to the N feature values.
  • the benchmark values specifically include:
  • Sub-step 5061 performs smoothing filtering on the N feature values corresponding to the N data frames.
  • the recursive filter is used to smooth the eigenvalues in each data frame.
  • the curve 1 is the eigenvalue change curve in the continuous touch area
  • the curve 2 The filtered eigenvalue curve; the smoothing filter is calculated as follows:
  • FeatureData(j+1) ⁇ *FeatureData(j+1)+(1- ⁇ )FeatureData(j)
  • FeatureData represents the eigenvalue
  • ⁇ is the empirical coefficient of the smoothing filter
  • j M, M+1, M+2, ... M+N-1.
  • Sub-step 5062 updates the N reference values corresponding to the N data frames according to the smoothed filtered N feature values.
  • the continuous touch is performed according to the trend of the eigenvalues of the filtered data frames.
  • the reference value in the area is locally updated; the difference value of the eigenvalues can be used to describe the trend of the eigenvalues, and all the reference values in the range of the continuous touch area are added to the difference value.
  • the present embodiment filters out the variation of the feature value caused by the jitter, and improves the accuracy of updating the reference value. It should be noted that the present embodiment can also be refinement based on the second embodiment to the fourth embodiment, and the same technical effects can be achieved.
  • the sixth embodiment of the present application relates to a touch detection circuit.
  • the touch detection circuit includes a processor 1.
  • the processor 1 is connected to a touch screen 2, and the touch screen 2 is applicable to an electronic device.
  • the processor 1 is configured to acquire a temperature value of an environment in which the touch screen 2 is located by using a temperature sensor in the electronic device.
  • the touch detection circuit may further include a driving circuit for generating a driving signal and a sensing circuit for detecting the sensing signal, and corresponding processing circuits such as AD conversion, amplification, mixing, and the like.
  • the processor 1 is configured to acquire a temperature value of an environment in which the touch screen 2 is located; the processor 1 is further configured to: when determining that the acquired temperature value is less than a preset temperature threshold, and determining that there is a continuous touch area on the touch screen 2, collecting through the touch screen 2 Continue to touch the N data frames of the area.
  • the processor 1 is further configured to calculate N feature values of the N data frames, and update N reference values corresponding to the N data frames according to the N feature values; wherein N>1 and N are integers.
  • the processor 1 takes the average value or the median value of the sensing values of the sensing nodes of the touched area of the touch screen 2 as the feature value, but is not limited thereto, and may also use the original value of a certain sensing node (the original value is Detecting a reference original value established before the user operation on the touch screen 2, obtained by sampling the touch control chip as a feature value; or a maximum or minimum value of the sensing value of all the sensing nodes of a touch area on the touch screen 2 As the feature value; or the maximum value or the minimum value of the sensing values of all the sensing nodes on the entire touch screen 2 as the feature value; wherein, in order to obtain the touch area of the touch screen 2
  • the average or median of the sensing values of the sensing nodes has better stability as the eigenvalues relative to the others.
  • the processor in this embodiment updates the N reference values corresponding to the N data frames according to the N feature values, and the calculation formula is:
  • Ref represents the reference value
  • FeatureData represents the feature value
  • ⁇ is the empirical coefficient of the reference update.
  • the present embodiment can be implemented in cooperation with the first embodiment.
  • the related technical details mentioned in the first embodiment are still effective in this embodiment, and the technical effects that can be achieved in the first embodiment can also be implemented in the present embodiment. To reduce repetition, details are not described herein again. Accordingly, the related art details mentioned in the embodiment can also be applied to the first embodiment.
  • the N data frames of the continuous touch area are collected, and the N features of the N data frames are utilized.
  • the value is updated to its corresponding N reference values such that the difference between the reference value of the continuous touch area and the sensed value does not decrease with the temperature rise caused by the heat transferred by the touch object, thereby avoiding the occurrence of low temperature cancellation.
  • the seventh embodiment of the present application relates to a touch detection circuit.
  • the present embodiment is substantially the same as the sixth embodiment.
  • the main difference is that, referring to FIG. 13, the touch detection circuit further includes a memory 3.
  • the processor 3 is connected to the memory 3, and the processor 1 and the storage 3 can be integrated in one touch control chip 12.
  • the memory 3 is configured to store a preset correspondence relationship between the feature value and the temperature value.
  • the processor 1 is configured to acquire the original collected by the touch screen 2 in an untouched state in the environment. Starting the detection data, calculating the feature value of the touch screen 2 in the environment according to the original detection data, and acquiring the temperature value corresponding to the feature value according to the preset correspondence relationship between the feature value and the temperature value.
  • the specific acquisition manner is described in detail in the second embodiment, and details are not described herein again.
  • the present embodiment can be implemented in cooperation with the second embodiment.
  • the technical details mentioned in the second embodiment are still effective in this embodiment, and the technical effects that can be achieved in the second embodiment can also be implemented in the embodiment. To reduce the repetition, details are not described herein again. Accordingly, the related art details mentioned in the embodiment can also be applied to the second embodiment.
  • this embodiment provides another method for acquiring the temperature value of the environment in which the touch screen is located, which can obtain the temperature value without using the temperature sensor, requires less hardware, and hardware for the electronic device.
  • the configuration requirements are low so that it can be applied to more electronic devices.
  • the eighth embodiment of the present application relates to a touch detection circuit.
  • This embodiment is a refinement of the sixth embodiment.
  • the main refinement is that the method for determining whether the touch panel 2 has a touch area is described in detail.
  • the processor 1 is further configured to acquire M data frames of the touch screen 2 when detecting a touch operation; and identify that each data frame is touched according to the sensing value of each sensing node of each data frame of the M data frames. State sensing node; wherein M data frames are acquired prior to N data frames.
  • the M value can be obtained by experimental observation in a low temperature environment.
  • the value of M is 9, but this embodiment does not impose any limitation.
  • the processor 1 is further configured to determine whether the sensing nodes in the touch state of the adjacent two data frames of the M data frames match; when the determination result is a match, the processor 1 determines that there is a continuous touch area, and from the M data. Selecting a data frame in the frame and sensing the touched state in the selected data frame The area formed by the node is set as the continuous touch area.
  • the present embodiment can be implemented in cooperation with the third embodiment.
  • the technical details mentioned in the third embodiment are still effective in this embodiment, and the technical effects that can be achieved in the third embodiment can also be implemented in this embodiment. To reduce repetition, details are not described herein again. Accordingly, the related art details mentioned in the embodiment can also be applied to the third embodiment.
  • This embodiment provides a specific method for determining whether there is a continuous touch area on the touch screen with respect to the sixth embodiment. It should be noted that this embodiment can also be used as the refinement of the seventh embodiment, and the same technical effects can be achieved.
  • the ninth embodiment of the present application relates to a touch detection circuit.
  • the present embodiment is an improvement based on the eighth embodiment.
  • the main improvement is that, in this embodiment, after determining the continuous touch area, according to a preset rule, Continue to touch the area to expand.
  • the processor 1 is further configured to expand the continuous touch area according to a preset rule after the continuous touch area is set.
  • the present embodiment can be implemented in cooperation with the fourth embodiment.
  • the technical details mentioned in the fourth embodiment are still effective in this embodiment.
  • the technical effects that can be achieved in the fourth embodiment can also be implemented in the embodiment. To reduce the repetition, details are not described herein again. Accordingly, the related art details mentioned in the embodiment can also be applied to the fourth embodiment.
  • the continuous touch area is expanded according to a preset rule, and the touch area is increased, thereby avoiding an error caused by the touch object slightly changing the touch position.
  • the tenth embodiment of the present application relates to a touch detection circuit.
  • This embodiment is a refinement of the sixth embodiment.
  • the main refinement is that the N corresponding to N data frames are updated according to the N feature values.
  • the method of the reference value is a refinement of the sixth embodiment.
  • the processor 1 is configured to perform smoothing filtering on the N feature values corresponding to the N data frames, and update N reference values corresponding to the N data frames according to the smoothed filtered N feature values.
  • FeatureData(j+1) ⁇ *FeatureData(j+1)+(1- ⁇ )FeatureData(j)
  • FeatureData represents the eigenvalue
  • ⁇ is the empirical coefficient of the smoothing filter
  • j M, M+1, M+2, ... M+N-1.
  • the present embodiment can be implemented in cooperation with the fifth embodiment.
  • the related technical details mentioned in the fifth embodiment are still effective in this embodiment, and the technical effects that can be achieved in the fifth embodiment can also be implemented in the present embodiment. To reduce repetition, details are not described herein again. Accordingly, the related art details mentioned in the embodiment can also be applied to the fifth embodiment.
  • the present embodiment filters out the variation of the feature value caused by the jitter, and improves the accuracy of updating the reference value. It should be noted that the present embodiment can also be refined as the basis of the seventh embodiment to the ninth embodiment, and the same technical effects can be achieved.
  • An eleventh embodiment of the present application relates to an electronic device such as a mobile phone, a tablet computer, or the like.
  • the electronic device includes the touch detection circuit of any of the sixth to ninth embodiments.
  • This embodiment provides an electronic device applying the above touch detection circuit with respect to the prior art.

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Abstract

一种电子设备、触摸检测电路以及触摸屏（2）的基准值的更新方法。触摸屏（2）的基准值的更新方法包括：获取触摸屏（2）所处环境的温度值（101）；当判定所获取的温度值小于预设的温度阈值（102），且判定触摸屏（2）上存在持续触摸区域时（103），采集持续触摸区域的N个数据帧（104）；计算N个数据帧的N个特征值（105）；根据N个特征值更新N个数据帧对应的N个基准值（106）；其中，N＞1且N为整数。采用上述方案，可以使持续触摸区域的基准值与感应值的差值不随触摸物件传递的热量导致的升温而减小，从而避免出现低温消点现象。

Description

电子设备、触摸检测电路以及触摸屏的基准值的更新方法 技术领域
本申请涉及触摸屏技术领域，特别涉及一种电子设备、触摸检测电路以及触摸屏的基准值的更新方法。
背景技术
目前，市场上大部分的电子终端设备(例如，手机、平板电脑等)实现人机交互都是采用的电容式触摸屏，电容式触摸屏通过电容传感器来检测用户的触摸操作。在检测触摸屏上的用户操作前，触摸屏一般会建立一个基准原始值，原始值通过触摸控制芯片打码采样获得，该基准原始值反映了电容传感器各感应节点的初始状态。当触碰物件(例如为手指、触控笔等其他可改变感应电容量的物体)在触摸屏上进行点击，划线等操作时会改变相应位置感应节点的电容量，此时获取的原始值为当前原始值，使用基准原始值减去当前原始值可得到差值，该差值即可反映触碰物件在操作位置引起的电容变化量，根据差值可计算并上报触控坐标。
发明人在实现本申请的过程中发现，现有技术中至少存在以下问题：当温度升高或下降时，由于电容传感器具有温漂特性，电容式触摸屏的原始值也会发生相应变化；在严寒环境下使用电容触摸屏时，当用户的手指持续放置在触摸屏某个位置时，刚开始会正常上报触控坐标，但随后会出现消点现象；其中，消点现象是指触碰物件在触摸屏上操作而触摸控制芯片不上报坐标；出现消点现象的原因是当用户刚将手指放在触摸屏上时，手指所处位置的电容感应 节点的原始值会减小，用基准原始值减去当前原始值可得到正的差值，当该差值超过某阈值时，触摸控制芯片将计算并上报坐标；然而在严寒环境下，触摸屏温度远低于人体手指温度，当手指持续放置在触摸屏的同一位置时，该位置的温度将会因手指传导的热量而逐渐升高，并导致该位置的电容感应节点的原始值逐渐增大，从而使得差值逐渐减小，当差值小于某阈值时，手指触摸的位置将会出现消点现象。
发明内容
本申请部分实施例的目的在于提供一种电子设备、触摸检测电路以及触摸屏的基准值的更新方法，可以使持续触摸区域的基准值与感应值的差值不随触摸物件传递的热量导致的温升而减小，从而避免出现低温消点现象。
本申请的一个实施例提供了一种触摸屏的基准值的更新方法，其特征在于，包括：获取触摸屏所处环境的温度值；当判定所获取的温度值小于预设的温度阈值，且判定触摸屏上存在持续触摸区域时，采集持续触摸区域的N个数据帧；计算N个数据帧的N个特征值；根据N个特征值更新N个数据帧对应的N个基准值；其中，N＞1且N为整数。
本申请实施例还提供了一种触摸检测电路，其特征在于，处理器和存储器，处理器连接于存储器与一触摸屏；处理器用于获取触摸屏所处环境的温度值；处理器还用于在判定所获取的温度值小于预设的温度阈值，且判定触摸屏上存在持续触摸区域时，通过触摸屏采集持续触摸区域的N个数据帧；处理器还用于计算N个数据帧的N个特征值，并根据N个特征值更新N个数据帧对应的N个基准值；其中，N＞1且N为整数。。
本申请实施例还提供了一种电子设备，包括：上述的触摸检测电路。
本申请实施例还提供了一种电子设备，应用于上述的触摸屏的基准值的更新方法，电子设备包括：温度传感器、触摸屏以及触摸芯片。触摸芯片连接于温度传感器与触摸屏；温度传感器用于获取触摸屏所处环境的温度值；触摸芯片用于在判定触摸屏所处环境的温度值小于预设的温度阈值，且判定触摸屏上存在持续触摸区域时，通过触摸屏采集持续触摸区域的N个数据帧；触摸芯片还用于计算N个数据帧的N个特征值，并根据N个特征值更新N个数据帧对应的N个基准值；其中，N＞1且N为整数。
本申请实施例相对于现有技术而言，当获取的触摸屏所处环境的温度值小于预设的温度阈值时，采集持续触摸区域的N个数据帧，并利用这N个数据帧的N个特征值来更新其对应的N个基准值，以使持续触摸区域的基准值随着环境温度变化而变化，由于从而持续触摸区域的基准值与感应值的差值不随触摸物件传递的热量导致的升温而减小，避免了出现低温消点现象。
另外，判定触摸屏上存在持续触摸区域中，具体包括：当检测到触摸操作时，采集触摸屏的M个数据帧；其中，M个数据帧先于N个数据帧被采集；根据M个数据帧中的每个数据帧的各感应节点的感应值，识别出每个数据帧中处于触摸状态的感应节点；判断M个数据帧中的相邻两个数据帧中的处于触摸状态的感应节点是否匹配；当判断结果为匹配时，判定存在持续触摸区域；从M个数据帧中选择一个数据帧，且将选择的数据帧中处于触摸状态的感应节点形成的区域设定为持续触摸区域。本实施例提供了判断触摸屏上存在持续触摸区域的具体方法。
另外，在将选择的数据帧中处于触摸状态的感应节点形成的区域设定为 持续触摸区域之后，还包括：按照预设规则将持续触摸区域外扩。本实施例中，在确定持续触摸区域之后，按照预设规则将持续触摸区域外扩，增大了触摸区域，避免了触摸物体轻微改变触摸位置产生的误差。
另外，根据N个特征值更新N个数据帧对应的N个基准值中，计算公式为：
Figure PCTCN2017091725-appb-000001
其中，Ref表示基准值，FeatureData表示特征值，α为基准更新的经验系数。本实施例提供了根据特征值更新对应基准值的具体计算公示。
另外，在根据N个特征值更新N个数据帧对应的N个基准值中，具体包括：对N个数据帧对应的N个特征值分别进行平滑滤波；根据平滑滤波后的N个特征值更新N个数据帧对应的N个基准值。本实施例中，滤除了抖动引起的特征值变化，提高了更新基准值的精确度。
另外，平滑滤波的计算公式为：
FeatureData(j+1)＝β*FeatureData(j+1)+(1-β)FeatureData(j)
其中，FeatureData表示特征值，β为平滑滤波的经验系数，j＝M，M+1，M+2，......M+N-1。本实施例提供了滤除抖动的平滑滤波计算公式。
另外，触摸屏应用于电子设备；触摸屏所处环境的温度值获取方式，具体为：通过设置在电子设备中的温度传感器获取温度值。本实施例提供了一种获取触摸屏所处环境的温度值的具体方式。
另外，触摸屏所处环境的温度值的获取方式，具体包括：获取触摸屏在所处环境中处于未触摸状态下采集的原始检测数据；根据原始检测数据计算触摸屏在环境中的特征值；根据特征值与温度值的预设对应关系，获取特征值对 应的温度值。本实施例提供了另一种获取温度值的具体方式，不需要通过温度传感器便可以获取温度值，所需硬件较少，对电子设备的硬件配置要求低，从而能够应用于更多的电子设备中。
另外，M的取值为9。
另外，计算N个数据帧的N个特征值包括：计算N个数据帧中的各感应节点的感应值的平均值或者中值，作为N个特征值。本实施例提供了特征值的具体计算方式，取各感应节点的感应值的平均值或中值作为特征值具有较好的稳定性。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表示为类似的元件，除非有特别申明，附图中的图不构成比例限制。
图1是根据本申请第一实施例的触摸屏的基准值的更新方法的具体流程图；
图2是根据本申请第一实施例的基准值更新后的基准值与感应值的差值变化曲线图；
图3是根据本申请第二实施例的触摸屏的基准值的更新方法的具体流程图；
图4是根据本申请第二实施例的电容触摸屏的示意图；
图5是根据本申请第二实施例的温度-原始值特性曲线图；
图6是根据本申请第三实施例的触摸屏的基准值的更新方法的具体流程 图；
图7是根据本申请第三实施例的触摸屏的部分基准值与感应值的差值的数据图；
图8是根据本申请第三实施例的持续触摸区域内基准值与感应值的差值的衰减趋势图；
图9是根据本申请第四实施例的触摸屏的基准值的更新方法的具体流程图；
图10是根据本申请第五实施例的触摸屏的基准值的更新方法的具体流程图；
图11是根据本申请第五实施例的滤波前后的特征值变化曲线图；
图12是根据本申请第六实施例的触摸检测电路的方框示意图；
图13是根据本申请第七实施例的触摸检测电路的方框示意图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请部分实施例进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
本申请第一实施例涉及一种触摸屏的基准值的更新方法，应用于电子设备，电子至少包括温度传感器、触摸屏以及触摸芯片，例如为手机、平板电脑等。触摸屏的基准值的更新方法的具体流程如图1所示。
步骤101，获取触摸屏所处环境的温度值。
具体而言，电子设备中设置有温度传感器，由温度传感器获取触摸屏所 处环境的温度值，然不限于此。
步骤102，判断获取的触摸屏所处环境的温度值是否小于预设的温度阈值。若是，则进入步骤103；若否，则直接结束。
具体而言，温度阈值可以根据低温环境实验获得，在实验中，预先设定一个环境温度，将手指或其他触碰物件按压于触摸屏，触摸屏的温度会逐渐升高，观察是否会出现消点现象，不断调整环境温度，可以将会出现消点的最高温度设定为温度阈值。本实施例中，由触摸芯片判断环境的温度值是否小于该温度阈值；当判定环境的温度值小于温度阈值时，则进入步骤103；否则，则说明触摸屏所处环境温度下，触摸屏不容易出现消点现象。
步骤103，判断触摸屏上是否存在持续触摸区域。若是，则进入步骤104；若否，则直接结束。
具体而言，当用户持续将手指放在触摸屏的同一位置时，才会因为触摸屏温度升高导致差值变小产生消点现象；触摸芯片判断触摸屏上是否存在持续触摸区域，当判定触摸屏上存在持续触摸区域时，才进入步骤104；否则，则说明用户并未持续将手指放在触摸屏同一位置，不容易产生消点现象。
步骤104，采集持续触摸区域的N个数据帧。
具体而言，在用户持续将手指放在触摸屏上期间，触摸芯片通过触摸屏采集持续触摸区域的N个数据帧；其中，N＞1且N为整数。
步骤105，计算N个数据帧的N个特征值。
具体而言，触摸芯片根据采集的N个数据帧，分别计算出N个特征值。
本实施例中以获取的触摸屏的触摸区域的各感应节点的感应值的平均值或中值作为特征值，然不限于此，还可以以某个感应节点的感应值作为特征 值；或触摸屏上的某个触摸区域的所有感应节点的感应值的最大值或最小值作为特征值；或整个触摸屏上的所有感应节点的感应值的最大值或最小值作为特征值；其中，以获取的触摸屏的触摸区域的各感应节点的感应值的平均值或中值作为特征值相对于其他几种具有较好的稳定性。
步骤106，根据N个特征值更新N个数据帧对应的N个基准值。
具体而言，触摸芯片根据持续触摸区域的特征值的变化趋势对持续触摸区域内的基准值进行局部更新，请参考图2，为基准值更新后，基准值与感应值的差值变化曲线图；从图中可以看出，从第9个数据帧开始基准值更新后的差值保持在140左右；可以使用特征值的差分值对特征值的变化趋势进行描述，将持续触摸区域范围内的所有基准值都加上该差分值，基准值的更新计算公式为：
Figure PCTCN2017091725-appb-000002
其中，FeatureData(M+K*n)-FeatureData(M+K*(n-1))表示特征值的差分值，Ref表示基准值，FeatureData表示特征值，α为基准更新的经验系数，K∈{1，2，3...}，K值的大小反应基准更新频率的快慢，M表示持续触摸区域中采集的数据帧的数量。
下面举例对该公式进行说明，例如K取值为2、M取值为9、n取值为1、2、3、...，则i＝K*n＝2、4、6，...；
Ref(M+i)＝Ref(M+K*(n-1))+α*(FeatureData(M+K*n)-FeatureData(M+K*(n-1)))
相当于每间隔两个数据帧对基准值进行依次更新，即对第11个数据帧、第13个数据帧、第15个数据帧等奇数数据帧的基准值进行更新；
Ref(M+i)＝Ref(M+i-1)
例如，ref(11)＝ref(10)，即利用更新后的基准值对间隔中的数据帧中的基准值进行替换更新，以完成对N个数据帧的基准值的更新。
需要说明的是，图1中只是示例性的描述出步骤，并不限制步骤101、步骤102与步骤103实际的执行顺序，即，本实例中，也可以先执行步骤103，对触摸屏上是否存在持续触摸区域进行判断，再执行步骤101与步骤102，获取触摸屏所处环境的温度值，判断获取的触摸屏所处环境的温度值是否小于预设的温度阈值。
本实施例相对于现有技术而言，当获取的触摸屏所处环境的温度值小于预设的温度阈值时，采集持续触摸区域的N个数据帧，并利用这N个数据帧的N个特征值来更新其对应的N个基准值，以使持续触摸区域的基准值随着环境温度变化而变化，从而持续触摸区域的基准值与感应值的差值不随触摸物件传递的热量导致的升温而减小，避免了出现低温消点现象。
本申请第二实施例涉及一种触摸屏的基准值的更新方法，本实施例与第一实施例大致相同，主要不同之处在于：第一实施例中，通过电子设备中的温度传感器获取触摸屏所处环境的温度值；本实施例中，提供了另一种触摸屏所处环境的温度值的获取方式。
本实施例中，请参考图3，电容触摸屏一般包括触控面板与触摸检测电路，触摸检测电路包括处理器与存储器，处理器与存储器可集成于同一触摸检测芯片中，然本实施例对此不做任何限制；触控面板是在基板上形成的电容传感器，电容传感器一般由驱动电极和感应电极组成，在典型的互容式触摸屏中，每一条驱动电极和感应电极相交的位置形成一个感应节点；图3中以5条驱动电极和5条感应电极为例，形成了25个感应节点。
本实施例中的触摸屏的基准值的更新方法如图4所示。
其中，步骤202至步骤206与步骤102至步骤106大致相同，在此不再赘述，主要细化之处在于：本实施例中，步骤201，获取触摸屏所处环境的温度值中，具体包括：
子步骤2011，获取触摸屏在所处环境中处于未触摸状态下的原始检测数据。
具体而言，电容触摸屏通过电容传感器来获取当前环境下且处于未触摸状态下的原始检测数据，请参考图3，处理器将一定频率的打码信号按照一定的驱动方式出入驱动电极，打码信号经过电容传感器后由感应电极返回到触摸屏，经过触摸屏内部ADC转换和数字信号处理后可得到各互电容感应节点的感应值；其中，原始检测数据中包括触摸屏的至少部分触摸区域内的各感应节点的感应值，即，原始检测数据可以为整个触摸屏上的所有感应节点的感应值，或触摸屏上的某个触摸区域内包含的所有感应节点的感应值。
下表1为触摸控制芯片依次打码采样获取的一帧原始数据，是以一个具有6根驱动电极和16根感应电极的电容触摸屏为例。
表1
5392 5385 5190 5210 5145 5205 5142 5218
5612 5572 5413 5398 5385 5386 5378 5393
5688 5628 5465 5444 5419 5437 5421 5451
4234 4180 4076 4058 4045 4052 4055 4068
5608 5545 5396 5378 5351 5366 5358 5380
5342 5260 5134 5103 5095 5103 5102 5132
5040 4880 4872 4938 4835 4749 4649 4639
5332 5053 5131 5114 5115 4927 4938 4824
5374 5112 5171 5172 5184 4989 4994 4894
4019 3811 3856 3855 3845 3718 3709 3651
5311 5049 5108 5108 5096 4934 4937 4843
5040 4801 4858 4854 4841 4681 4680 4606
子步骤2012，根据原始检测数据计算出触摸屏在所处环境中的特征值。
具体而言，处理器根据获取的触摸屏的触摸区域的各感应节点的感应值来计算触摸屏在环境中的特征值；其中，特征值的计算方法与步骤105大致相同，在此不再赘述。
子步骤2013，根据特征值与温度值的预设对应关系，获取特征值对应的温度值。
具体而言，处理器根据特征值与温度值的预设对应关系，可以获取特征值对应的温度值。其中，特征值与温度值的对应关系可以以温度-原始值特性曲线表示，然本实施例对此不作任何限制；如图5所示，为某触摸屏的温度-原始值特性曲线，通过曲线拟合的方式可得到温度与特征值的函数关系y＝f(x)，其中，自变量x为温度，因变量y为触摸屏的特征值，将触摸屏的特征值带入该函数便可以计算出触摸屏当前所处环境的温度值。
本实施例相对于第一实施例而言，提供了另一种触摸屏所处环境的温度值的获取方式，不需要通过温度传感器便可以获取温度值，所需硬件较少，对电子设备的硬件配置要求低，从而能够应用于更多的电子设备中。
本申请第三实施例涉及一种触摸屏的基准值的更新方法，本实施例是对 第一实施例的细化，主要细化之处在于：对步骤103：判断触摸屏上是否存在持续触摸区域，进行了详细的介绍。
本实施例中的触摸屏的基准值的更新方法如图6所示。
其中，步骤301、步骤302与步骤101、步骤102大致相同，步骤304至步骤306与步骤104至步骤106大致相同，在此不再赘述，主要不同之处在于：本实施例中，步骤303，判断触摸屏上是否存在持续触摸区域，具体包括：
子步骤3031，检测是否有触摸操作。若是，则进入子步骤3032；若否，则直接结束。
具体而言，检测是否有触摸操作，即，检测用户是否在使用电子设备。当判定用户正在使用电子设备时，进入子步骤3032；否则直接结束。
子步骤3032，采集触摸屏的M个数据帧。
具体而言，当判定用户在使用手指触摸电子设备触摸屏时，采集触摸屏的M个数据帧；其中，触摸屏的M个数据帧先于N个数据帧被采集，即，用户手指触摸触摸屏期间，先采集的M个数据帧，用于判断是否存在持续触摸区域，随后再采集的N个数据帧，用于更新基准值；M值可以通过低温环境实验观察获得，本实施例中M的取值为9(容下详述)，然本实施例对此不作任何限制。
子步骤3033，根据M个数据帧中的每个数据帧中的各感应节点的感应值，识别出每个数据帧中属于被触摸处于触摸状态的感应节点。
具体而言，根据每个数据帧中的各感应节点的感应值，计算每个数据帧中所有感应节点的基准值与感应值的差值；然后，将每个差值与阈值TouchLevel进行比较，判定差值大于阈值TouchLevel的感应节点为处于触摸状态，由此可 以识别出每个数据帧中处于触摸状态的感应节点。
子步骤3034，判断M个数据帧中的相邻两个数据帧中的处于触摸状态的感应节点是否匹配。若是，则进入子步骤3035；若否，则直接结束。
具体而言，在采集的M个数据帧中，计算每个数据帧中处于触摸状态的感应节点的基准值与感应值的差值，根据该差值判断触摸屏上是否有触摸物件并计算触摸物件所处的位置范围，当相邻两个数据帧中计算的位置范围包含一半及以上相同的感应节点时，则判定结果为匹配，说明存在持续触摸区域，进入子步骤3035；否则，则说明不存在持续触摸区域，不会产生低温消点现象，直接结束。
子步骤3035，从M个数据帧中选择一个数据帧，且将选择的数据帧中处于触摸状态的感应节点形成的区域设定为持续触摸区域。
具体而言，一般选择M个数据帧中的第一个数据帧来判断持续触摸区域，请参考图7，为某一数据帧中触屏物件在触摸屏上形成的部分差值数据，每一个方格分别对应于图3中的驱动电极与感应电极相交形成的感应节点，其中，阈值TouchLevel＝100，即，差值大于100的点为感应节点，虚线框区域为该数据帧中的所有感应节点形成的区域，以此区域作为持续触摸区域；请参考图8，为在低温环境下，手指持续放置在触摸屏某位置后，持续触摸区域内差值的衰减趋势图，从图中可以看出，差值衰减到阈值TouchLevel(TouchLevel＝100)附近时，持续采集了43个数据帧，因此，M的值小于43，即M的取值是在0到43之间择优选择；如图2所示，从第9数据帧(即M＝9)开始基准值更新后的差值一直维持在140左右，大于阈值TouchLevel＝100，不会出现低温消点现象；因此，本实施例中M择优取值为9。
本实施例中，阈值TouchLevel取值为100，然而本实施例对此不作任何限制，可以根据经验来设定。
本实施例相对于第一实施例而言，提供了判断触摸屏上是否存在持续触摸区域的具体方法。需要说明的是，本实施例也可以作为对第二实施例的细化，可以达到相同的技术效果。
本申请第四实施例涉及一种触摸屏的基准值的更新方法，本实施例是在第三实施例基础上的改进，主要改进之处在于：本实施例中，在确定持续触摸区域之后，按照预设规则将持续触摸区域外扩。
本实施例中的触摸屏的基准值的更新方法如图9所示。
其中，步骤401、步骤402、与步骤301、步骤302大致相同，步骤404至步骤406与步骤304至步骤306大致相同，子步骤4031至子步骤4035与子步骤3031至子步骤3035大致相同，在此不再赘述，主要不同之处在于：本实施例中，增加了子步骤4036，具体如下：
子步骤4036，按照预设规则将持续触摸区域外扩。
具体而言，在确定了持续触摸区域后，按照预设规则将持续触摸区域外扩，例如，在持续触摸区域中每个方向的最外侧的感应节点的基础上外扩一个感应节点，以外扩后感应节点所在直线相交形成的矩形区域作为触摸区域，请参考图7，每一个方格分别对应于图3中的驱动电极与感应电极相交形成的感应节点，虚线框表示持续触摸区域，在上、下、左、右四个方向上，最外侧感应节点分别为106、100、123以及132(以差值表示感应节点)，外扩后的感应节点为16、-11、-2以及8，因此，外扩后，图7中的整个矩形框为外扩后触摸区域。
本实施例相对于三实施例而言，在确定持续触摸区域之后，按照预设规则将持续触摸区域外扩，增大了触摸区域，避免了触摸物体轻微改变触摸位置产生的误差。
本申请第五实施例涉及一种触摸屏的基准值的更新方法，本实施例是对第一实施例的细化，主要细化之处在于：对步骤106：根据N个特征值更新N个数据帧对应的N个基准值，进行了详细的介绍。
本实施例中的触摸屏的基准值的更新方法如图10所示。
其中，步骤501至步骤505与步骤101至步骤105大致相同，在此不再赘述，主要不同之处在于：本实施例中，步骤506，根据N个特征值更新N个数据帧对应的N个基准值中，具体包括：
子步骤5061，对N个数据帧对应的N个特征值分别进行平滑滤波。
具体而言，由于触摸屏的特征值不仅会受到触摸物件温度引起的缓慢变化，还会受到触碰物件抖动引起的变化，因此需要对抖动引起的特征值的变化进行滤除；由于抖动引起的特征值的变化是瞬时的，本实施例中采用递归滤波器对每个数据帧中的特征值进行平滑滤波，请参考图11，图中曲线1为持续触摸区域范围内特征值变化曲线，曲线2为滤波后的特征值变化曲线；平滑滤波的计算公式如下：
FeatureData(j+1)＝β*FeatureData(j+1)+(1-β)FeatureData(j)
其中，FeatureData表示特征值，β为平滑滤波的经验系数，j＝M，M+1，M+2，......M+N-1。
子步骤5062，根据平滑滤波后的N个特征值更新N个数据帧对应的N个基准值。
具体而言，根据经过滤波后的各数据帧的特征值的变化趋势对持续触摸 区域范围内的基准值进行局部更新；可以使用特征值的差分值对特征值的变化趋势进行描述，将持续触摸区域范围内的所有基准值都加上该差分值。
本实施例相对于第一实施例而言，滤除了抖动引起的特征值变化，提高了更新基准值的精确度。需要说明的是，本实施例也可以作为第二实施例至第四实施例基础上的细化，可以达到相同的技术效果。
本申请第六实施例涉及一种触摸检测电路，请参考图12，触摸检测电路包括：处理器1。
本实施例中，处理器1连接于一触摸屏2，触摸屏2可应用于电子设备，处理器1用于通过电子设备中的温度传感器获取触摸屏2所处环境的温度值。
触摸检测电路还可以包括产生驱动信号的驱动电路和用于检测感应信号的感应电路，以及对应的AD转换、放大、混频等处理电路。
处理器1用于获取触摸屏2所处环境的温度值；处理器1还用于在判定所获取的温度值小于预设的温度阈值，且判定触摸屏2上存在持续触摸区域时，通过触摸屏2采集持续触摸区域的N个数据帧。
处理器1还用于计算N个数据帧的N个特征值，并根据N个特征值更新N个数据帧对应的N个基准值；其中，N＞1且N为整数。
其中，处理器1将获取的触摸屏2的触摸区域的各感应节点的感应值的平均值或中值作为特征值，然不限于此，还可以以某个感应节点的原始值(原始值是在检测触摸屏2上的用户操作前，建立的基准原始值，通过触摸控制芯片打码采样获得)作为特征值；或触摸屏2上的某个触摸区域的所有感应节点的感应值的最大值或最小值作为特征值；或整个触摸屏2上的所有感应节点的感应值的最大值或最小值作为特征值；其中，以获取的触摸屏2的触摸区域的 各感应节点的感应值的平均值或中值作为特征值相对于其他几种具有较好的稳定性。
本实施例的处理器根据N个特征值更新N个数据帧对应的N个基准值中，计算公式为：
Figure PCTCN2017091725-appb-000003
其中，Ref表示基准值，FeatureData表示特征值，α为基准更新的经验系数。
由于第一实施例与本实施例相互对应，因此本实施例可与第一实施例互相配合实施。第一实施例中提到的相关技术细节在本实施例中依然有效，在第一实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第一实施例中。
本实施例相对于现有技术而言，当获取的触摸屏所处环境的温度值小于预设的温度阈值时，采集持续触摸区域的N个数据帧，并利用这N个数据帧的N个特征值来更新其对应的N个基准值，以使持续触摸区域的基准值与感应值的差值不随触摸物件传递的热量导致的升温而减小，从而避免出现低温消点现象。
本申请第七实施例涉及一种触摸检测电路，本实施例与第六实施例大致相同，主要不同之处在于：请参考图13，触摸检测电路还包括存储器3。
本实施例中，处理器3连接于存储器3，处理器1与存储3可集成在一个触摸控制芯片12中。
存储器3用于存储特征值与温度值的预设对应关系。
处理器1用于获取触摸屏2在所处环境中处于未触摸状态下采集的原 始检测数据、根据原始检测数据计算触摸屏2在所处环境中的特征值、并根据特征值与温度值的预设对应关系，获取特征值对应的温度值。其中，具体的获取方式在第二实施例中有详细的介绍，在此不再赘述。
由于第二实施例与本实施例相互对应，因此本实施例可与第二实施例互相配合实施。第二实施例中提到的相关技术细节在本实施例中依然有效，在第二实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第二实施例中。
本实施例相对于第六实施例而言，提供了另一种触摸屏所处环境的温度值的获取方式，不需要通过温度传感器便可以获取温度值，所需硬件较少，对电子设备的硬件配置要求低，从而能够应用于更多的电子设备中。
本申请第八实施例涉及一种触摸检测电路，本实施例是对第六实施例的细化，主要细化之处在于：详细介绍了判断触摸屏2是否存在触摸区域的方法。
处理器1还用于在检测到触摸操作时，采集触摸屏2的M个数据帧；并根据M个数据帧的每个数据帧的各感应节点的感应值，识别出每个数据帧中处于触摸状态的感应节点；其中，M个数据帧先于N个数据帧被采集。M值可以通过低温环境实验观察获得，较佳的，M的取值为9，然本实施例对此不作任何限制。
处理器1还用于判断M个数据帧的相邻两个数据帧中的处于触摸状态的感应节点是否匹配；当判断结果为匹配时，处理器1判定存在持续触摸区域，并从M个数据帧中选择一个数据帧，且将选择的数据帧中处于触摸状态的感应 节点形成的区域设定为持续触摸区域。
由于第三实施例与本实施例相互对应，因此本实施例可与第三实施例互相配合实施。第三实施例中提到的相关技术细节在本实施例中依然有效，在第三实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第三实施例中。
本实施例相对于第六实施例而言，提供了判断触摸屏上是否存在持续触摸区域的具体方法。需要说明的是，本实施例也可以作为对第七实施例的细化，可以达到相同的技术效果。
本申请第九实施例涉及一种触摸检测电路，本实施例是在第八实施例基础上的改进，主要改进之处在于：本实施例中，在确定持续触摸区域之后，按照预设规则将持续触摸区域外扩。
本实施例中，处理器1还用于在设定了持续触摸区域之后，按照预设规则将持续触摸区域外扩。
由于第四实施例与本实施例相互对应，因此本实施例可与第四实施例互相配合实施。第四实施例中提到的相关技术细节在本实施例中依然有效，在第四实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第四实施例中。
本实施例相对于八实施例而言，在确定持续触摸区域之后，按照预设规则将持续触摸区域外扩，增大了触摸区域，避免了触摸物体轻微改变触摸位置产生的误差。
本申请第十实施例涉及一种触摸检测电路，本实施例是对第六实施例的细化，主要细化之处在于：详细介绍了根据N个特征值更新N个数据帧对应的N个基准值的方法。
本实施例中，处理器1用于对N个数据帧对应的N个特征值分别进行平滑滤波，并根据平滑滤波后的N个特征值更新N个数据帧对应的N个基准值。
本实施例中的平滑滤波的计算公式为：
FeatureData(j+1)＝β*FeatureData(j+1)+(1-β)FeatureData(j)
其中，FeatureData表示特征值，β为平滑滤波的经验系数，j＝M，M+1，M+2，......M+N-1。
由于第五实施例与本实施例相互对应，因此本实施例可与第五实施例互相配合实施。第五实施例中提到的相关技术细节在本实施例中依然有效，在第五实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第五实施例中。
本实施例相对于第六实施例而言，滤除了抖动引起的特征值变化，提高了更新基准值的精确度。需要说明的是，本实施例也可以作为第七实施例至第九实施例基础上的细化，可以达到相同的技术效果。
本申请第十一实施例涉及一种电子设备，例如为手机、平板电脑等。本实施例中，电子设备包括第六实施例至第九实施例中任一项的触摸检测电路。
本实施例相对于现有技术而言，提供了一种应用上述触摸检测电路的电子设备。
本领域的普通技术人员可以理解，上述各实施例是实现本申请的具体 实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的精神和范围。

Claims (21)

  1. 一种触摸屏的基准值的更新方法，其特征在于，包括：
    获取触摸屏所处环境的温度值；
    当判定所获取的温度值小于预设的温度阈值，且判定所述触摸屏上存在持续触摸区域时，采集所述持续触摸区域的N个数据帧；
    计算所述N个数据帧的N个特征值；
    根据所述N个特征值更新所述N个数据帧对应的N个基准值；
    其中，N＞1且N为整数。
  2. 如权利要求1所述的更新方法，其特征在于，所述判定所述触摸屏上存在持续触摸区域包括：
    当检测到触摸操作时，采集所述触摸屏的M个数据帧；其中，所述M个数据帧先于所述N个数据帧被采集；
    根据所述M个数据帧中的每个所述数据帧的各感应节点的感应值，识别出每个所述数据帧中处于触摸状态的感应节点；
    判断所述M个数据帧中的相邻两个所述数据帧中的处于触摸状态的所述感应节点是否匹配；
    当判断结果为匹配时，判定存在所述持续触摸区域；
    从所述M个数据帧中选择一个数据帧，且将选择的所述数据帧中处于触摸状态的所述感应节点形成的区域设定为所述持续触摸区域。
  3. 如权利要求2所述的更新方法，其特征在于，在所述将选择的所述数据帧中处于触摸状态的所述感应节点形成的区域设定为所述持续触摸区域之后，还包括：
    按照预设规则将所述持续触摸区域外扩。
  4. 如权利要求1所述的更新方法，其特征在于，所述根据所述N个特征值更新所述N个数据帧对应的N个基准值中，计算公式为：
    Figure PCTCN2017091725-appb-100001
    其中，Ref表示基准值，FeatureData表示特征值，α为基准更新的经验系数。
  5. 如权利要求1所述的更新方法，其特征在于，在所述根据所述N个特征值更新所述N个数据帧对应的N个基准值包括：
    对所述N个数据帧对应的N个特征值分别进行平滑滤波；
    根据平滑滤波后的所述N个特征值更新所述N个数据帧对应的N个基准值。
  6. 如权利要求5所述的更新方法，其特征在于，所述平滑滤波的计算公式为：
    FeatureData(j+1)＝β*FeatureData(j+1)+(1-β)FeatureData(j)
    其中，FeatureData表示特征值，β为平滑滤波的经验系数，j＝M，M+1，M+2，......M+N-1。
  7. 如权利要求1至6中任一项所述的更新方法，其特征在于，所述触摸屏应用于电子设备；所述触摸屏所处环境的温度值获取方式，具体为：
    通过设置在所述电子设备中的温度传感器获取所述温度值。
  8. 如权利要求1至6中任一项所述的更新方法，其特征在于，所述触摸屏所处环境的温度值的获取方式，具体包括：
    获取所述触摸屏在所处环境中处于未触摸状态下采集的原始检测数据；
    根据所述原始检测数据计算所述触摸屏在所处环境中的特征值；
    根据特征值与温度值的预设对应关系，获取所述特征值对应的温度值。
  9. 如权利要求2所述的更新方法，其特征在于，M的取值为9。
  10. 如权利要求1所述的更新方法，其特征在于，所述计算所述N个数据帧的N个特征值包括：
    计算所述N个数据帧中的各感应节点的感应值的平均值或者中值，作为所述N个特征值。
  11. 一种触摸检测电路，其特征在于，至少包括处理器，所述处理器连接于一触摸屏；
    所述处理器用于获取触摸屏所处环境的温度值；
    所述处理器还用于在判定所获取的温度值小于预设的温度阈值，且判定所述触摸屏上存在持续触摸区域时，通过所述触摸屏采集所述持续触摸区域的N个数据帧；
    所述处理器还用于计算所述N个数据帧的N个特征值，并根据所述N个特征值更新所述N个数据帧对应的N个基准值；其中，N＞1且N为整数。
  12. 如权利要求11所述的触摸检测电路，其特征在于，所述处理器还用于在检测到触摸操作时，采集所述触摸屏的M个数据帧；并根据所述M个数据帧的每个所述数据帧的各感应节点的感应值，识别出每个所述数据帧中处于触摸状态的感应节点；其中，所述M个数据帧先于所述N个数据帧被采集；
    所述处理器还用于判断所述M个数据帧的相邻两个所述数据帧中的处于触摸状态的所述感应节点是否匹配；当判断结果为匹配时，所述处理器判定存 在所述持续触摸区域，并从所述M个数据帧中选择一个数据帧，且将选择的所述数据帧中处于触摸状态的所述感应节点形成的区域设定为所述持续触摸区域。
  13. 如权利要求12所述的触摸检测电路，其特征在于，所述处理器还用于在设定了所述持续触摸区域之后，按照预设规则将所述持续触摸区域外扩。
  14. 如权利要求11所述的触摸检测电路，其特征在于，所述处理器根据所述N个特征值更新所述N个数据帧对应的N个基准值中，计算公式为：
    Figure PCTCN2017091725-appb-100002
    其中，Ref表示基准值，FeatureData表示特征值，α为基准更新的经验系数。
  15. 如权利要求11所述的触摸检测电路，其特征在于，所述处理器用于对所述N个数据帧对应的N个特征值分别进行平滑滤波，并根据平滑滤波后的所述N个特征值更新所述N个数据帧对应的N个基准值。
  16. 如权利要求15所述的触摸检测电路，其特征在于，所述平滑滤波的计算公式为：
    FeatureData(j+1)＝β*FeatureData(j+1)+(1-β)FeatureData(j)
    其中，FeatureData表示特征值，β为平滑滤波的经验系数，j＝M，M+1，M+2，......M+N-1。
  17. 如权利要求11至16中任一项所述的触摸检测电路，其特征在于，所述触摸屏应用于电子设备；
    所述处理器用于通过所述电子设备中的温度传感器获取触摸屏所处环境的温度值。
  18. 如权利要求11至16中任一项所述的触摸检测电路，其特征在于，所 述触摸检测电路还包括连接于所述处理器的存储器；
    所述存储器用于存储特征值与温度值的预设对应关系；
    所述处理器用于获取所述触摸屏在所处环境中处于未触摸状态下采集的原始检测数据、根据所述原始检测数据计算所述触摸屏在所处环境中的特征值、并根据特征值与温度值的预设对应关系，获取所述特征值对应的温度值。
  19. 如权利要求12所述的触摸检测电路，其特征在于，M的取值为9。
  20. 如权利要求11所述的触摸检测电路，其特征在于，所述处理器用于计算所述N个数据帧中的各感应节点的感应值的平均值或者中值，作为所述N个特征值。
  21. 一种电子设备，包括：权利要求11至20中任一项所述的触摸检测电路。
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