CN110231877A - Touching signals processing method and stylus - Google Patents

Abstract

The present invention discloses a touch signal processing method and a touch pen. The touch signal processing method is applicable to a touch pen used in combination with a touch panel, and comprises the following steps: using a first signal receiving component to receive a transmission signal from the touch panel and generate a first reception signal; using a second signal receiving component to receive the transmission signal and generate a second reception signal; operating the first reception signal and the second reception signal to generate a result value; and sending a driving signal to the touch panel according to the result value to perform a touch operation.

Description

Touch signal processing method and stylus

technical field

The present invention relates to a signal processing method and a stylus, and in particular to a touch signal processing method and a stylus using the aforementioned method.

Background technique

The touch screen allows users to perform various functions by touching the touch-sensitive panel with fingers, stylus or other objects, so many electronic devices, such as smart phones or tablet computers, use touch panels as operating The interface is operated by the user in a manner of touch, thereby improving convenience. However, in order to make the operation process of the touch panel faster and provide detailed functions such as drawing line thickness and brush, most users will choose a stylus for touch writing or drawing.

In order to make the strokes of the stylus change in thickness during use, a pressure sensor is usually installed in the pen shell to determine the thickness of the strokes by sensing the pressure of the pen core against the pressure sensor. However, the effect is not as expected.

Contents of the invention

According to the present invention, a touch signal processing method is provided, which is suitable for a stylus used in conjunction with a touch panel. The method includes the following steps: using a first signal receiving element to receive at least a signal and generate a first received signal; use a second signal receiver to receive the signal and generate a second received signal; perform an operation on the first received signal and the second received signal to generate a result value; and according to The result value sends a driving signal to the touch panel for touch operation.

The present invention also provides a stylus, including a signal processor, a signal transmission part, a first signal receiving part, a second signal receiving part, a differential processor and a control module; the signal transmission part is electrically connected to Signal processor, the first signal receiving part is electrically connected to the signal processor and receives at least one signal generated by the touch panel and generates at least one first receiving signal, and the second signal receiving part receives at least one signal and generates at least one second receiving signal signal; the differential processor is electrically connected to the first signal receiving part and the second signal receiving part, and operates the first received signal and the second received signal to generate a result value; the control module is electrically connected to the signal processor, the differential processor and the pressure The sensor and the control module generate a driving signal to the touch panel according to the comparison between a reference voltage and the result value for touch operation.

Description of drawings

FIG. 1 shows a schematic diagram of a stylus of the present invention for use with a touch panel;

FIG. 2 shows a circuit block diagram of the stylus of the present invention; and

FIG. 3 is a waveform diagram of a first received signal, a second received signal, a differential signal and a driving signal.

Explanation of reference signs: 1-stylus; 10-pen holder; 102-cavity; 12-pen head; 122-signal transmission part; 124-first signal receiving part; 126-second signal receiving part; 128-insulator ;14-circuit board; 3-touch panel; 30-touch surface; 140-signal processor; 142-control module; 1420-microprocessor; 1422-programmable regulator; Processor; 146-pressure sensor; 148-battery; _ND -differential noise; _NRX1 -first noise; N _RX2 -second noise; Rx-receiving electrode; S-sensing unit; S _C -control signal; S _D - differential signal; S _P - pressure signal; S _RX1 , S _RX1' - first received signal; S _RX2 - second received signal; S _TX - driving signal; Tx - scanning electrode; Vref - reference voltage.

Detailed ways

FIG. 1 is a schematic diagram of a stylus of the present invention for use with a touch panel. The stylus 1 of the present invention is applied to a capacitive touch panel (hereinafter referred to as "touch panel") 3. When the stylus 1 touches the surface of the touch panel 3, the pressure of the touch panel 3 can be Get input information about stylus 1.

In FIG. 1 , the stylus 1 is located on the touch surface 30 of the touch panel 3 , and its tip 12 is connected to the sensing unit formed at the intersection of one of the scanning electrodes Tx and one of the receiving electrodes Rx in the touch panel 3 A coupling capacitance is formed between S. It should be noted here that the touch panel 3 may include a plurality of scanning electrodes Tx arranged parallel to the X axis, and a plurality of receiving electrodes Rx arranged parallel to the Y axis, and the intersection point of the scanning electrodes Tx and the receiving electrodes Rx That is, a sensing unit S is defined; for the sake of simplicity, only a scanning electrode Tx and a receiving electrode Rx corresponding to the touch point of the stylus 3 are shown in FIG. A sensing unit S at the intersection of Rx.

The stylus 1 includes a pen holder 10 and a pen head 12; the pen holder 10 is used for holding by the user, and a cavity 102 can be provided in the pen holder 10 for accommodating a circuit board 14; the circuit board 14 can be equipped with a After the signal from the touch panel 3 is processed, a driving signal S _TX (as shown in FIG. 3 ) is sent to the electronic circuit of the touch panel 3 for touch operation (details will be described later). The nib 12 is located at one end of the penholder 10 for contacting the touch surface 30 of the touch panel 3; the nib 12 is provided with a signal transmission part 122, a first signal receiving part 124, a second signal receiving part 126 and a plurality of The insulator 128; the first signal receiving member 124 is disposed farthest from the pen holder 10 and is used to contact the touch panel 3. The insulator 128 is respectively arranged on the adjacent signal transmitting member 122, the first signal receiving member 124 and the adjacent signal receiving member 124 arranged at a predetermined interval. Between the second signal receiving part 126 , the signal transmitting part 122 , the first signal receiving part 124 and the second signal receiving part 126 made of conductors such as metal or conductive plastic are prevented from contacting and short circuiting.

For example, in FIG. 1 , the signal transmission part 122 is disposed between the first signal receiving part 124 and the second signal receiving part 126, and an insulating part 128 is interposed between the signal transmission part 122 and the first signal receiving part 124. The other insulating member 128 is interposed between the signal transmitting member 122 and the second signal receiving member 126; the pen head 12 is arranged with the second signal receiving member 126 in the direction away from the pen holder 10 as it moves away from the pen holder 10 , the insulating element 128 , the signal transmitting element 122 , the insulating element 128 and the first signal receiving element 122 . However, in actual implementation, the second signal receiving part 126 can also be arranged between the signal transmitting part 122 and the first signal receiving part 124, so that the pen head 12 moves away from the pen holder 10 in the direction away from the pen holder 10 in sequence. The signal transmitting part 122 , the insulating part 128 , the second signal receiving part 126 , the insulating part 128 and the first signal receiving part 122 are arranged.

Generally speaking, when using the stylus 1 to click or write on the touch panel 3, there is an oblique angle between the stylus 1 and the touch surface 3 of the touch panel 3 which is not 90 degrees. As shown in Figure 1; therefore, the first signal receiving part 124 and the second signal receiving part 126 disposed on the tip 12 can respectively receive at least one signal with a single specific frequency from the scanning electrode Tx of the touch panel 3. Signal, signal noise may exist in the signal.

In FIG. 3 , a first received signal S _RX1 that can be generated after the first signal receiving part 124 receives the signal is defined. There may be a first noise N _RX1 in the first received signal S _RX1 , and the second signal receiving part 126 receives the signal Then a second received signal S _RX2 may be generated, and second noise N _{RX2 may exist in the second received signal S RX2 .} Because the first signal receiving element 124 can directly contact the touch panel 3, and the second signal receiving element 126 is set farther away from the touch panel 3, the amplitude of the first received signal S _RX1 (marked as a1 in FIG. 3 ) will be greater than the amplitude of the second received signal S _RX2 (marked as a2 in FIG. 3 ). The amplitudes of the first receiving signal S _RX1 and the second receiving signal S _RX2 are inversely proportional to the distances between the first signal receiving element 124 and the second signal receiving element 126 and the touch surface 30 of the touch panel 3 . Of course, the amplitude of the first noise _NRX1 existing in the first received signal _SRX1 will also be larger than the amplitude of the second noise _NRX2 existing in the second received signal _SRX2 .

Secondly, a first frequency f1 of the first received signal is the same as a second frequency f2 of the second received signal.

FIG. 2 is a circuit block diagram of the stylus of the present invention. In FIG. 2, the stylus 1 further includes a signal processor 140, a control module 142, a differential processor 144, a pressure sensor 146 and a battery 148, which can be respectively configured on the circuit board 14 shown in FIG. 1, and The signal from the touch panel 3 can be processed and then a driving signal S _TX can be sent to the touch panel 3 for touch operation.

The differential processor 144 is electrically connected to the first signal receiving part 124 and the second signal receiving part 126, and it can receive the first receiving signal S _RX1 provided by the first signal receiving part 124, and the second receiving signal provided by the second signal receiving part 126. The received signal S _RX2 is then differentially compared to the first received signal S _RX1 and the second received signal S _RX2 to generate a differential signal _SD . In this embodiment, the amplitude of the differential signal SD (marked as a _D in FIG. ₃ ) may be between the amplitude of the first received signal S _RX1 and the amplitude of the second received signal S _RX2 . However, it should be noted that, without departing from the scope of the present invention, variations of the present embodiment allow the amplitude of the differential signal SD to be smaller than both the amplitude of the first received signal _{S RX1} and the amplitude of the second received signal S _RX2 . In addition, the amplitude of the noise existing in the differential signal _{SD (hereinafter referred to as the differential noise N D )} can be between the amplitude of the first noise N _RX1 and the amplitude of the second noise N _RX2 or smaller than the first noise N _RX1 at the same time. and the amplitude of the second noise N _RX2 .

In addition, in another embodiment of the present invention, the difference between the amplitude of the differential signal SD generated by the differential processor 144 (marked as a _D in FIG. ₃ ) and the amplitude of the differential noise _ND may be greater than the first received A first difference between the amplitude of the signal S _RX1 and the amplitude of the first noise N _RX1 ; wherein, a second difference between the amplitude of the second received signal S _RX2 and the amplitude of the second noise N _RX2 is smaller than the aforementioned first difference value.

Referring again to FIG. 2 ; the control module 142 is electrically connected to the differential processor 144 to receive the differential signal _SD provided by the differential processor 144. The control module 142 can determine that the touch event is valid through the differential signal _SD provided by the differential processor 144. An operation event or an invalid operation event; wherein, the control module 142 can determine whether the touch event is a valid operation event or an invalid operation event, for example, by determining the waveform and amplitude of the differential signal _SD .

More specifically, the control module 142 may include a microprocessor 1420 , a programmable regulator 1422 and a comparator 1424 ; the programmable regulator 1422 is electrically connected to a power supply Vcc for providing a reference voltage Vref. The comparator 1424 is electrically connected to the programmable regulator 1422 and the differential processor 144 to receive the reference voltage Vref provided by the programmable regulator 1422 and the differential signal _SD provided by the differential processor 144 . Besides the electronic components shown in FIG. 2 , the control module 142 can also be implemented by an integrated circuit. In actual operation, the comparator 1424 can provide an output signal (high potential) to the microprocessor 1420 when the differential signal _SD is not less than the reference voltage Vref to notify the microprocessor 1420 that the touch event is a valid operation event; otherwise The comparator 1424 may not provide an output signal when the differential signal _SD is lower than the reference voltage Vref or provide an output signal with a low potential to the microprocessor 1420 to notify the microprocessor 1420 that the touch event is an invalid operation event.

If the control module 142 judges that the touch event is an effective operation event, the control module 142 and the control module 142 can choose to provide the differential signal _{SD and a control signal S C generated} by the control module 142 when the touch event is an effective operation event to the control module 142 at the same time. Signal processor 140; wherein, the differential signal _SD can carry relevant data, such as: the model of the stylus 1, the brush color, shape, thickness selected by the user, and the brush applied by the user on the stylus 1. pressure etc. However, it should be noted that without departing from the scope of the present invention, the control module 142 may choose to simultaneously provide the differential signal SD, the pressure signal _{SP provided by the pressure sensor 146 and the control signal S C to the} signal processor 140; , the amplitude of the pressure signal S _P is proportional to the force of the stylus 1 against the touch screen 3, which means that the greater the force of the stylus 1 against the touch screen 3, the greater the amplitude of the pressure signal S _P Conversely, the smaller the force of the stylus 1 against the touch screen 3 is, the smaller the amplitude of the pressure signal S _P is.

The signal processor 140 is electrically connected to the first signal receiving part 124 and the signal transmitting part 122; when the control module 142 can choose to provide the differential signal _{SD and the control signal S C to} the signal processor 140 at the same time, the signal processor 140 can then The control signal S _C is integrated into the differential signal _SD to generate a driving signal S _TX to allow the touch panel 3 to perform touch operation.

When the control module 142 only chooses to provide the signal processor 140 with the differential signal S _D , the pressure signal S _P and the control signal S _C at the same time, the signal processor 140 can then integrate the pressure signal S _p and the control signal S _C into the differential signal _SD is used to generate the driving signal S _TX to allow the touch panel 3 to perform touch operations. For example, the pressure signal S _P can be used to determine the stroke thickness of the graphic and text displayed on the touch screen 3 . It should be particularly noted here that the signal processor 140 will incorporate the control signal S _C (and the pressure signal S _P ) when the differential signal S _D ends for a predetermined time t and the junction of the differential signal S _D has not yet occurred, as shown in FIG. 3.

Finally, the signal processor 140 then sends the driving signal S _TX to the signal transmission part 122 , and transmits it to the touch screen 3 through the signal transmission part 122 for touch operation.

In addition, if the control module 142 determines that the touch event is an invalid operation event, the control module 142 will not provide the pressure signal _SP to the signal processor 140, and the signal processor 140 may choose to directly use the differential signal _SD as The driving signal S _TX is sent to the signal transmission part 122

Based on the foregoing, the touch signal processing method of the present invention can be implemented as follows. Firstly, use the first signal receiver 124 to receive at least one signal of the same frequency generated by the touch panel 3 and generate at least one first received signal S _RX1 , and use the second signal receiver 126 to receive the signal and generate at least one second Receive signal S _RX2 . Then, the first received signal S _RX1 and the second received signal S _RX2 are calculated to generate a result value, and a driving signal S _TX is sent to the touch panel according to the result value to perform a touch operation.

In the method described in the preceding paragraph, performing operations on the first received signal S _RX1 and the second received signal S _RX2 to generate a result value includes: performing differential comparisons on the first received signal S _RX1 and the second received signal S _RX2 to generate a difference signal SD; and when the differential signal _SD is greater than or equal to the reference voltage Vref, sending a driving signal including the differential signal _SD and a control signal _{S C to} trigger an event corresponding to a valid touch operation.

In the method mentioned in the preceding paragraph, it further includes: receiving a pressure signal S _P ; and sending the driving signal including the differential signal _{SD , the control signal S C and} the pressure signal S _P to trigger an event corresponding to an effective touch operation. The amplitude of the pressure signal S _P is proportional to the force of the stylus 1 pressing against the touch screen 3 . More specifically, if the force of the stylus 1 against the touch screen 3 is greater and the amplitude of the pressure signal S _P is greater, the strokes displayed on the touch screen 3 will be thicker; otherwise, the stylus will 1. The smaller the value of the force against the touch screen 3 is, the smaller the amplitude of the pressure signal S _P is, and the finer the strokes displayed on the touch screen 3 are.

In one embodiment of the present invention, the control signal _SC and the pressure signal SP are _merged into the differential signal _SD after a predetermined time after the end of the differential signal _SD .

In the aforementioned method, when the differential signal is lower than the reference voltage, an event corresponding to the invalid touch operation is triggered.

The stylus 1 can also include a battery 148 for providing power for the components in the stylus 1 to operate. In FIG. 2, the battery 148 is electrically connected to the control module 142, which provides power to the control module 142, and the control module 142 distributes the power to the signal transmitting part 122, the first signal receiving part 124, and the second signal receiving part. 126, the signal processor 140, the differential processor 144, and the pressure sensor 146 supply power; in actual implementation, the battery 148 can also be directly to the signal transmission part 122, the first signal receiving part 124, the second signal receiving part 126, the signal processing The controller 140, the control module 142, the differential processor 144, and the pressure sensor 146 are powered.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to the definition of the claims in this case.

Claims (10)

1. a kind of touching signals processing method, which is characterized in that comprise the steps of:

An at least signal for the identical frequency that touch panel generates is received using one first signal receiving element and generates at least 1 the One receives signal；

The signal, which is received, using a second signal receiving element and generates at least one second receives signal；

The first reception signal and the second reception signal are subjected to operation to generate an end value；And

A driving signal, which is sent, according to the end value gives touch panel to carry out touch-control operation.

2. touching signals processing method as described in claim 1, which is characterized in that by the first reception signal and this second connect A number progress operation of collecting mail is comprised the steps of: with generating the end value

Differential comparison is carried out to generate a differential signal to the first reception signal and the second reception signal；And

The driving comprising the differential signal and a control signal is sent when the differential signal is greater than or equal to a reference voltage Signal is to trigger the corresponding event of effective touch control operation.

3. touching signals processing method as claimed in claim 2, which is characterized in that further include following steps:

Receive a pressure signal；And

It is corresponding to trigger effective touch control operation to send the driving signal comprising the differential signal, control signal and the pressure signal Event.

4. touching signals processing method as claimed in claim 3, which is characterized in that the control signal and the pressure signal are in this It is incorporated in the differential signal after a predetermined time after differential signal and generates the driving signal.

5. touching signals processing method as claimed in claim 2, which is characterized in that further include following steps:

When the differential signal is less than the reference voltage, the corresponding event of invalid touch control operation is triggered.

6. a kind of stylus, characterized by comprising:

One signal processor；

One signal transferring member, is electrically connected to the signal processor；

One first signal receiving element is electrically connected to the signal processor and receives at least the one of the identical frequency of touch panel generation Signal simultaneously generates at least one first reception signal；

One second signal receiving element receives the signal and generates at least one second reception signal；

One differential processor is electrically connected to the first signal receiving element and the second signal receiving element, operation the first reception letter Number and this second receive signal to generate a differential signal；And

One control module, is electrically connected to the signal processor and the differential processor, the control module according to a reference voltage and The comparison of the differential signal gives touch panel to generate a driving signal to carry out touch-control operation.

7. stylus as claimed in claim 6, which is characterized in that when the differential signal is greater than or equal to the reference voltage, The control module generates a control signal and the control signal and the differential signal is transferred to signal processor, the signal processing The control signal is incorporated in the differential signal by device triggers the corresponding event of effective touch control operation to generate the driving signal.

8. stylus as claimed in claim 6, which is characterized in that when the differential signal is less than the reference voltage, the control The differential signal is transferred to signal processor to trigger the corresponding event of invalid touch control operation by module.

9. stylus as claimed in claim 6, which is characterized in that further include a pressure sensor, be electrically connected to the control mould Block and for generating a pressure signal, wherein the pressure signal and the differential signal are transferred to the signal processing by the control module The pressure signal is incorporated in the differential signal and is touched with generating the driving signal to touch panel by device, the signal processor Control operation.

10. stylus as claimed in claim 9, which is characterized in that the control signal, the pressure signal are in the differential signal One of after be incorporated in the differential signal.