CN112306306A - Method for judging touch event - Google Patents
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- CN112306306A CN112306306A CN202011183606.5A CN202011183606A CN112306306A CN 112306306 A CN112306306 A CN 112306306A CN 202011183606 A CN202011183606 A CN 202011183606A CN 112306306 A CN112306306 A CN 112306306A
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- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 230000002238 attenuated effect Effects 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 11
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 2
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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
- G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04186—Touch location disambiguation
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Abstract
The invention provides a method for judging a touch event, which comprises the steps of sensing a touch event through an ultrasonic sensor and acquiring a signal feedback value, wherein the signal feedback value has a reference value; comparing the feedback value with the reference value to determine an update mechanism of the reference value according to the comparison result; wherein the update mechanism comprises: when the signal feedback value is judged to be larger than the reference value, a counter is triggered to start counting and the counting times are recorded; and when the counting number exceeds the preset number, stopping updating the reference value. Otherwise, the reference value is continuously updated. If the feedback value does not exceed the reference value, the counter is reset to zero and the reference value is updated directly. And finally, comparing the difference value between the signal feedback value and the reference value with a preset critical value to judge whether the touch event is effective. By the invention, an accurate touch judgment result can be achieved.
Description
Technical Field
The present invention relates to a method for determining a touch event, and more particularly, to a method for determining a touch event, which is suitable for an ultrasonic sensor and can dynamically determine whether a reference value is updated according to a comparison result between a feedback signal value and the reference value.
Background
Generally, a sensor is a device or apparatus capable of sensing the change of an external signal and converting the external signal into a usable output signal according to a certain rule, and generally includes a sensing element and a conversion element. For example, the touch sensor can receive the stimulation of the input signal of the contact (including the finger of the user or the glue pen, etc.), and sense the change of the pressure, heat energy or infrared ray by using the sensing element to make the output signal in response. For example, when a finger touches the panel from above, a sufficiently large coupling capacitance is generated between the upper transparent electrode and the finger, and the touch point coordinates are detected from the induced current generated by the change in capacitance value. However, since the surface capacitive touch is unable to detect multi-touch events in principle and the accuracy is not as good as expected, the ultrasonic touch technology is instead used.
In general, the ultrasonic touch technology is becoming more mature and widely applied, and when applied to an ultrasonic touch panel, coordinates of touch points can be calibrated by calculating feedback values of received signals in a manner of emitting ultrasonic waves at a single point. The principle is that, based on the fact that the touch pointer absorbs the originally transmitted ultrasonic signal to cause signal attenuation, the signal received by the receiving end is different from that received by the receiving end when the signal is not in operation, please refer to fig. 1A and 1B, where fig. 1A is the signal of the ultrasonic signal transmitting end and fig. 1B is the signal of the signal receiving end, the reduction of the signal amplitude can be seen by comparing the two diagrams, and then the accurate position of the touch point can be obtained by comparing the signal attenuation before and after touch through the controller and the firmware thereof.
Furthermore, the ultrasonic digital conversion value udc (ultrasonic digital converter) is a digital value generated and outputted by converting the ultrasonic analog voltage signal through an analog-to-digital converter, and can be read and calculated by the back-end processor. Please refer to fig. 2, which is a schematic diagram illustrating a change of UDC value before and after a touch event (a user's finger) occurs. Among them, as shown in fig. 2, it can be clearly seen that: at time A1, the touch event was triggered, and at time A2, the touch event was removed. When the touch occurs, the UDC digital value of the ultrasonic sensor is reduced downwards relative to the UDC digital value when the touch does not occur, so that when the UDC digital value exceeds a reference value set by software, the software triggers the next-stage circuit to react.
However, in the normal state of the touch firmware, the value of UDC has a reference value (Baseline), and the reference value is used to determine whether a touch event occurs. The baseline value is updated with a constant value every frame (frame) within a defined range, however, a touch event will cause the change of the UDC to exceed the trigger threshold set by the firmware within a certain frame and trigger the behavior of the system plane. However, if the change amount of the UDC is very small or gradually increases, such as due to the influence of the temperature, humidity and the size of the contact area, in such a case, the small change amount of the UDC is merged into the update mechanism of the reference value, which may cause erroneous determination of the touch event or the occurrence of a situation where the user experience is insensitive to touch. Fig. 3 illustrates a normal touch and an abnormal touch. As shown, the value of UDC is shown as a solid line and the dashed line is the reference value of UDC. When Δ UDC (current) -baseline is the UDC reference value currently corresponding to a frame, and UDC (current) is the UDC digital value corresponding to the frame, and Δ UDC is greater than the trigger event threshold (finger EvtTH) set by the firmware, the system determines that a normal touch event occurs, as shown in the N1 interval, and determines that a touch event is triggered from the A3 time point, and stops updating the reference value. However, it should be noted that, as shown in the interval N2, when a user's finger or a touch is slowly approaching and the contact area thereof is gradually increasing, the value of UDC is continuously increasing, and the variation (Δ UDC) of the UDC is very slight or slowly increasing, in this case, the very slight variation of the UDC may be merged into the update mechanism of the original reference value, and the result of misjudgment or insensitivity of the touch event is generated, i.e. the abnormal touch represented by the interval N3: the problem that the system firmware cannot be identified is caused by the small Δ UDC.
In view of the above, the present inventors have made a sense of improvement of the above-mentioned deficiency, and based on the related experiences of the years, and with the application of the study, they have carefully observed and studied and provided a novel and effective method for determining the above-mentioned deficiency, and the specific structure and implementation of the method are described in detail below.
Disclosure of Invention
In order to solve the problems of the prior art, an object of the present invention is to provide a method for determining a touch event, which is an improvement of the existing touch determination method.
Another objective of the present invention is to provide a method for determining a touch event, which uses a UDC variation value as a determination mechanism for determining whether to update a UDC reference value, so as to limit an update mechanism of the UDC reference value, thereby effectively solving the defects of touch insensitivity and system misjudgment caused by the inability to identify a small UDC variation value in the prior art.
It is still another object of the present invention to provide a method for determining a touch event, wherein even if a finger or a stylus of a user slowly approaches a trigger point, the touch event can be successfully identified by the determining method disclosed in the present invention and reported as an effective touch.
In view of the above, the present invention discloses a method for determining a touch event, which comprises the following steps:
(1) sensing a touch event by an ultrasonic sensor and acquiring a signal feedback value from the ultrasonic sensor, wherein the signal feedback value has a reference value;
(2) comparing the signal feedback value with a reference value to determine whether the reference value is updated according to the comparison result; and
(3) the signal feedback value and the reference value have a difference value, and the difference value is compared with a preset critical value to judge whether the touch event is effective or not.
According to the determining method disclosed by the embodiment of the invention, the determining method is suitable for the ultrasonic sensor, the ultrasonic sensor is electrically coupled to a microprocessor, and the determining method of the touch event is executed by the microprocessor.
In one embodiment, the ultrasonic sensor includes a signal transmitting unit, a signal receiving unit and a signal integrated chip, wherein the signal transmitting unit and the signal receiving unit are electrically coupled to a trigger point of the touch event, the signal transmitting unit transmits an original signal, the original signal is attenuated by the touch event, so that the signal receiving unit outputs the signal feedback value for the signal integrated chip to transmit to the microprocessor for processing.
The feedback signal is preferably a UDC digital signal.
Furthermore, according to an embodiment of the present invention, before the step of determining whether the reference value is updated according to the comparison result between the signal feedback value and the reference value, the method further includes:
(2a) when the signal feedback value is larger than the reference value, triggering a counter to start counting and recording the counting times; and
(2b-1) when the counted number of times exceeds a predetermined number of times, the reference value is stopped from being updated. The predetermined number can be preset by a user and stored in the microprocessor, but the present invention is not limited thereto.
(2b-2) otherwise, when the number of times counted by the counter does not exceed the preset number of times, continuously updating the reference value.
On the other hand, according to an embodiment of the present invention, before the step of determining whether the reference value is updated according to the comparison result between the signal feedback value and the reference value, the method further includes:
(2c) when the signal feedback value is less than or equal to the reference value, the counter is reset to zero and the update mechanism of the reference value is directly performed.
Then, in the step of comparing the difference between the signal feedback value and the reference value with the preset threshold to determine whether the touch event is valid, the user may also preset the preset threshold and store the preset threshold in the microprocessor for algorithm determination, but the invention is not limited thereto. Therefore, when the difference between the signal feedback value and the reference value exceeds the preset threshold, the system reports that the touch event is determined to be an effective touch. Otherwise, if the difference between the signal feedback value and the reference value is less than or equal to the predetermined threshold, the touch event is determined as an invalid touch, and the algorithm retrieves the next signal feedback value again through the ultrasonic sensor to restart the process.
By means of the design, the method for determining a touch event disclosed by the invention can naturally utilize the change of the difference value between the signal feedback value and the reference value as a determination mechanism for determining whether the reference value is updated, compared with the prior art that only an unprocessed reference value is used as a standard for determining whether to trigger, the method can dynamically determine the update mechanism of the reference value according to the change of the difference value between the signal feedback value and the reference value, and can achieve an accurate touch determination result under the condition that a finger or a contact of a user slowly approaches a trigger point or the difference value between the signal feedback value and the reference value is too small, thereby effectively improving various defects in the prior art.
The purpose, technical content, features and effects of the present invention will be more readily understood by the following detailed description of the embodiments with the accompanying drawings.
Drawings
FIG. 1A is a signal diagram of an ultrasonic signal transmitting end in the prior art.
FIG. 1B is a signal diagram of an ultrasonic signal receiving end in the prior art.
FIG. 2 is a schematic diagram illustrating a change in UDC value before and after a touch event occurs.
FIG. 3 is a schematic diagram of a normal touch and an abnormal touch where Δ UDC is too small to be recognized by system firmware.
FIG. 4 is a schematic diagram of an embodiment of a method for determining a touch event according to the present invention.
Fig. 5 is a flowchart illustrating a method for determining a touch event according to an embodiment of the invention.
Fig. 6 is a detailed step diagram of a method for determining a touch event according to an embodiment of the invention.
FIG. 7 is a diagram illustrating a preferred result of applying the touch event determination method according to an embodiment of the present invention.
Reference numerals:
10 … ultrasonic sensor
12 … trigger point
20 … microprocessor
30 … System level
102 … Signal Transmission Unit
104 … Signal receiving Unit
106 … signal integrated chip
A1, A2, A3 … time points
Intervals of N1, N2, N3 and N4 …
S501, S503, S505 … steps
S601, S603, S605, S607, S609, S611, S613, S615, S621, S623, S625 … steps
Detailed Description
The foregoing description of the invention and the following detailed description are presented to illustrate and explain the principles and spirit of the invention and to provide further explanation of the invention as claimed. The features, operation and function of the present invention will be described in detail with reference to the drawings.
In order to effectively solve the problems in the prior art, because the extremely small variation of the UDC may be merged into the update mechanism of the original reference value, the system firmware cannot be identified, and an abnormal touch result of misjudgment or insensitivity of a touch event is generated; the present invention provides a better improvement design for these defects, which is a method for determining touch events. In order to better understand the technical content of the present invention, please refer to fig. 4 to fig. 6, wherein fig. 4 is a schematic diagram of a specific architecture for executing the determining method disclosed in the present invention, fig. 5 and fig. 6 are flowcharts of steps of the determining method according to the embodiment of the present invention, and the present invention will be described in detail below.
According to the embodiment of the present invention, the ultrasonic sensor 10 is electrically coupled to a microprocessor 20, and the ultrasonic sensor 10 includes a signal transmitting unit 102, a signal receiving unit 104 and a signal integrating chip 106. The signal transmitting unit 102 and the signal receiving unit 104 are electrically coupled to the trigger point 12 of a touch event, such as, but not limited to, a finger of a user, a glue pen, or other contact capable of triggering a signal. The signal transmitting unit 102 transmits an original signal attenuated by the touch event, and the signal receiving unit 104 receives the attenuated signal and outputs a signal feedback value for the signal ic 106 to transmit to the microprocessor 20 for processing. The present invention discloses a method for determining a touch event, which is executed by the microprocessor 20 to further trigger the system level 30 to react after the determination is completed.
Referring to the flowchart shown in fig. 5, the method for determining a touch event according to the present invention first performs step S501, in which the ultrasonic sensor 10 in fig. 4 senses a touch event and acquires a feedback value of the touch event. According to the embodiment of the present invention, the obtained signal feedback value is defined as a UDC digital signal, and more specifically, is a digital value generated and outputted after an ultrasonic analog voltage signal is converted by an analog-to-digital converter. The UDC digital signal has a reference value.
Then, step S503 is executed to compare the signal feedback value (UDC) with the reference value (baseline) thereof, so as to determine the updating mechanism of the reference value according to the comparison result. Since the unprocessed reference value is directly used as the criterion for determining whether to trigger in the prior art, the above-mentioned problems are also generated; in view of this, the core of the determination method disclosed in the present invention is the update mechanism that can dynamically determine the reference value according to the comparison result between the feedback signal value and the reference value, i.e. in step 503, whether to update the reference value can be dynamically determined according to the comparison result between the feedback signal value and the reference value.
Finally, step S505 is executed again: comparing the difference (Δ UDC) between the feedback signal value and the reference value with a predetermined threshold (finger EvtTH) to determine whether the touch event is valid. Wherein the difference Δ UDC is an absolute value of a difference between the signal feedback value (UDC) and a reference value (baseline), and Δ UDC | -UDC-baseline |. According to an embodiment of the present invention, the predetermined threshold value may be predetermined and stored in the microprocessor 20. When Δ UDC is greater than the predetermined threshold, the touch event is determined to be an active touch. Otherwise, if Δ UDC is less than or equal to the predetermined threshold, the touch event is determined as an invalid touch, and the process returns to step S501 again to retrieve the next signal feedback value.
The present invention is further directed to the following step S503: how to dynamically determine the updating mechanism of the reference value according to the comparison result between the signal feedback value and the reference value is provided for a detailed description, which is shown in the steps disclosed with reference to fig. 6.
In steps S601 to S603, as in step S501 of fig. 5, the signal feedback value (UDC) is obtained from the ultrasonic sensor, and the digital UDC signal has a reference value. Then, step S605 is executed to compare the feedback signal value with a reference value, and if the feedback signal value is greater than the reference value, step S607 is executed to: triggering a counter to start counting, and simultaneously recording the counting times. The counting unit of the counter is a frame, so the counter counts a counter according to each frame and sets an interval to record the counting times. According to one embodiment of the present invention, in step S607, the counter starts to accumulate. Then, in step S609, it is determined whether the counting number of the counter exceeds a preset number of a system, wherein the preset number can be preset by a user and stored in the microprocessor 20 shown in fig. 4, but the invention is not limited thereto. In other words, the system user or the software developer can design the system according to the actual product requirement, and still fall within the scope of the invention without departing from the spirit of the invention.
According to the embodiment of the present invention, when the counting number of the counter exceeds the preset number, step S611 is executed: the updating of the reference value is stopped. Otherwise, when the counting number of the counter is less than or equal to the preset number, step S615 is executed: the reference value is updated.
On the other hand, if the feedback signal value is compared with the reference value in step S605, if the feedback signal value is smaller than or equal to the reference value, step S613 is executed: the counter is reset to zero, and then step S615 is executed to directly perform the update mechanism of the reference value.
Subsequently, after the update mechanism of the reference value is determined, the present determination method proceeds to the following steps S621, S623, and S625. In steps S621 to S625, corresponding to step S505 of fig. 5, a difference (Δ UDC) between the feedback signal value and the reference value is determined, as shown in step S621. Then, in step S623, it is determined whether the difference exceeds a predetermined threshold of the system, and if so, step S625 is executed to report the touch event as an effective touch. Otherwise, if the difference is smaller than or equal to the predetermined threshold, the process returns to step S603 to re-acquire the next signal feedback value and repeat the process.
Therefore, in view of the technical solution disclosed in the present invention, based on that an untouched UDC change value can be regarded as a change of interactive increase and decrease, the present invention can use this characteristic as a determination mechanism in the firmware flow of the determination method, and detect whether the change value is always increased within a specific frame range, and then limit the update mechanism of the UDC reference value. FIG. 7 is a schematic diagram of a preferred result obtained by applying the determination method disclosed in the present invention, wherein the UDC digital value is shown by a solid line and the dotted line is a reference value of the UDC digital value. It can be seen that in the interval N4, the firmware algorithm detects a continuously slowly increasing Δ UDC, thus controlling the UDC baseline to stop updating. Then, with the advance of each frame range, the change value of the UDC is gradually brought out, so that the delta UDC is larger than a preset critical value set by the firmware, and the touch event can be accurately and correctly identified.
In view of the above, it is obvious that compared with the prior art, the novel touch event determination method disclosed in the present invention can effectively solve the problem of erroneous determination of touch event or touch insensitivity generated in user experience in the prior art. According to the technical solution taught by the present invention, by using the determination method disclosed by the present invention, the update mechanism of the reference value can be dynamically determined according to the comparison result between the signal feedback value and the reference value, and compared with the prior art that only the unprocessed reference value can be directly used as the standard for determining whether to trigger, the determination method disclosed by the present invention can more accurately and precisely determine whether a touch event is effective touch, thereby preventing the conventional defects and realizing the more optimized inventive effect of the present invention.
It should be noted that, according to the technical solutions taught by the present invention, one skilled in the art can change the design of the present invention in its practical implementation, and the present invention is within the scope of the present invention. The present invention is illustrated in the foregoing paragraphs by way of examples, which are provided to further explain the main technical features of the invention and to enable those skilled in the art to understand and implement the invention, and the invention should not be construed as being limited by the examples.
In addition, the method for determining a touch event according to the present invention can be widely applied to touch products such as an intelligent switch or a touched intelligent desk lamp, and the scope of the application of the present invention is not limited thereto.
In summary, the technical solution disclosed in the present invention has excellent industrial applicability and competitiveness. It is obvious that the technical features, methods, means and effects disclosed by the present invention are obviously different from the prior art, and are not easily accomplished by those skilled in the art, so that the present invention has the patent requirements.
Claims (10)
1. A method for determining a touch event, wherein an ultrasonic sensor is electrically coupled to a microprocessor, such that the method for determining the touch event is performed by the microprocessor, the method comprising:
sensing a touch event through the ultrasonic sensor and acquiring a signal feedback value, wherein the signal feedback value has a reference value;
comparing the signal feedback value with the reference value to determine whether the reference value is updated according to the comparison result; and
and comparing the signal feedback value with the reference value according to a difference value and a preset critical value to judge whether the touch event is effective.
2. The method of claim 1, wherein when the difference is greater than the predetermined threshold, the touch event is determined to be an active touch.
3. The method as claimed in claim 1, wherein when the difference is less than or equal to the predetermined threshold, the touch event is determined as an invalid touch and the next signal feedback value is retrieved again.
4. The method of claim 1, wherein before the step of determining whether the reference value is updated according to the comparison result between the signal feedback value and the reference value, the method further comprises:
judging that when the signal feedback value is larger than the reference value, triggering a counter to start counting and recording the counting times; and
when the counting number exceeds a preset number, the reference value stops updating.
5. The method of claim 4, further comprising:
when the counting number does not exceed the preset number, the reference value is continuously updated.
6. The method of claim 4, wherein before the step of determining whether the reference value is updated according to the comparison result between the signal feedback value and the reference value, the method further comprises:
and when the signal feedback value is judged to be less than or equal to the reference value, the counter is reset to zero, and the updating mechanism of the reference value is directly carried out.
7. The method as claimed in claim 1, wherein the ultrasonic sensor includes a signal transmitting unit, a signal receiving unit and a signal ic, the signal transmitting unit and the signal receiving unit are electrically coupled to a trigger point of the touch event, the signal transmitting unit transmits an original signal, the original signal is attenuated by the touch event, so that the signal receiving unit outputs the signal feedback value for the signal ic to transmit to the microprocessor for processing.
8. The method of claim 1, wherein the signal feedback value is a UDC digital signal.
9. The method as claimed in claim 1, wherein the predetermined threshold is predetermined and stored in the microprocessor.
10. The method as claimed in claim 4, wherein the predetermined number is predetermined and stored in the microprocessor.
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| CN202011183606.5A CN112306306A (en) | 2020-10-29 | 2020-10-29 | Method for judging touch event |
| TW109138323A TWI740701B (en) | 2020-10-29 | 2020-11-03 | Method for determining a touch event |
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| Publication number | Publication date |
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| TWI740701B (en) | 2021-09-21 |
| TW202217533A (en) | 2022-05-01 |
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