WO2014067388A1

WO2014067388A1 - Touch pen and signal transmission method thereof, and touch controller and signal detection method thereof

Info

Publication number: WO2014067388A1
Application number: PCT/CN2013/085231
Authority: WO
Inventors: 陈小祥; 邓耿淳; 冉锐; 叶金春
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2012-10-29
Filing date: 2013-10-15
Publication date: 2014-05-08
Also published as: CN102902383B; CN102902383A

Abstract

The present invention relates to the technical field of touch controls. Provided are a touch pen and signal transmission method thereof, and a touch controller and signal detection method thereof, the touch pen signal transmission method comprising: detecting whether the tip of the touch pen is bearing pressure or whether a key on the touch pen is pressed; if yes, then transmitting a first touch signal, the first touch signal being used to calculate the current coordinate position on the touch screen of the touch pen and synchronize the time sequence of the touch pen and the touch controller; encoding the value of the detected pressure born by the tip of the touch pen and/or the key value of the key on the touch pen, and transmitting a second touch signal according to the code. The present invention realizes multiple application functions of a touch pen.

Description

Touch pen and signal transmission method thereof, touch controller and signal detection method thereof

Technical field

The present invention relates to the field of touch technologies, and in particular, to a touch pen and a signal transmission method thereof, a touch controller, and a signal detection method thereof.

Background technique

With the support of multi-touch technology, capacitive touch screens have become the new favorite of touch screen products. The screens used by more and more devices are converted from resistive screens to capacitive screens. In the eastern countries represented by China, due to hieroglyphics and traditional habits, most users are still accustomed to using handwriting input. However, when handwriting is input on a capacitive touch screen by hand, the following two problems occur: (1) Lost point: When the user Handwriting will cause serious loss when handwriting; (2) Overflow: When the finger is raised, it often produces severe excess handwriting. When the finger is wet, the phenomenon of dropping or overflowing is more serious, and the input cannot be realized at all. Therefore, the demand for capacitive touch pens is growing. As shown in FIGS. 1 and 2, the finger or touch pen 100 inputs information on the touch sensor 101 of the touch screen terminal, and the touch controller 102 of the touch screen terminal responds to the input information after parsing.

When the hand is touched in FIG. 1, the vertical polar line (Y) of the touch sensor receives the driving signal of the touch controller as the driving line, the horizontal polar line (X) receives the sensing signal as the sensing line, and the sensing signal is sent to the touch controller, and the touch sensor In the "compatibility" state. When the touch pen is touched in FIG. 2, the vertical polar line (Y) and the horizontal polar line (X) of the touch sensor receive the sensing signal as the sensing line, and the sensing signal is sent to the touch controller, and the touch sensor is in a “self-contained” state.

Existing capacitive touch pens are classified into two types, passive and active. Passive-type capacitive touch pens are actually just a simple alternative to finger touch. The current active capacitive touch pen can only transmit a single driving signal, which is only used to establish the coupling between the touch pen and the touch sensor, and can not transmit various application functions of the touch pen, and the prior art also There is no disclosure of a touch pen signal transmission method capable of transmitting various application functions of a touch pen and a corresponding signal detection method of the touch controller.

technical problem

The present invention is directed to the above-mentioned drawbacks of the prior art, and provides a touch pen capable of transmitting various application functions of a touch pen, a signal transmission method thereof, a touch controller, and a signal detection method thereof.

Technical solution

The technical solution adopted by the invention is:

A touch pen signal transmission method, the method comprising:

Detecting whether the tip of the touch pen is under pressure or whether the button on the touch pen is pressed;

Detecting that the touch pen tip is subjected to pressure or a button press on the touch pen, and transmitting a first touch signal, the first touch signal is used to calculate a touch screen coordinate position where the touch pen is currently located, and a touch pen and a touch controller for the touch pen Timing synchronization

The detected pressure value of the touch pen tip and/or the button value of the button on the touch pen are encoded, and the second touch signal is transmitted according to the code.

A touch pen that uses the above-described touch pen signal transmission method for signal transmission.

A touch controller signal detecting method, the method comprising:

Detecting the first touch signal, and performing timing synchronization of the touch pen and the touch controller according to the detected start position or end position of the first touch signal;

The second touch signal is detected, and the detected second touch signal is decoded to obtain a pressure value of the touch pen tip and/or a button value of the button on the touch pen.

A touch controller that performs signal detection using the touch controller signal detection method described above.

Beneficial effect

The invention detects the pressure or the button, firstly sends the first touch signal to calculate the touch pen coordinates and performs timing synchronization, and then encodes according to the pressure value and/or the button value to send the second touch signal, through the second The pressure value and/or key value of the touch signal can realize various application functions of the touch pen.

DRAWINGS

1 is a schematic diagram of inputting on a touch sensor of a touch terminal with a finger provided by the prior art;

2 is a schematic diagram of inputting on a touch sensor of a touch terminal by using a touch pen provided by the prior art;

3 is a schematic diagram of a method for transmitting a touch pen signal according to Embodiment 1 of the present invention;

4 is a schematic diagram of a touch signal provided by Embodiment 1 of the present invention;

Figure 5 is a code table in a binary coded value manner;

6 is a schematic diagram of a method for detecting a signal of a touch controller according to Embodiment 1 of the present invention;

7 is a schematic diagram of detection when the pulse timing of the touch pen is ahead of the detection timing of the touch controller in Embodiment 1 of the present invention;

8 is a schematic diagram of detection when the pulse timing of the touch pen lags behind the detection timing of the touch controller in Embodiment 1 of the present invention;

9 is a schematic diagram of detection when the pulse timing of the touch pen is synchronized with the detection timing of the touch controller in Embodiment 1 of the present invention;

FIG. 10 is a schematic diagram of waveforms of a touch signal according to Embodiment 2 of the present invention; FIG.

Figure 11 is a code table sequentially transmitted using a plurality of pulses;

12 is a schematic diagram of a touch signal provided by Embodiment 3 of the present invention;

13 is a waveform diagram of a preferred embodiment of the touch signal of FIG. 12;

FIG. 14 is a block diagram of a transmitting circuit of the second touch signal in FIG. 13; FIG.

Figure 15 is a code table transmitted using a plurality of pulse superpositions.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following "pen ends" refer to "touch pen end", and "screen end" refers to "touch screen end".

Example 1:

This embodiment provides a touch pen signal transmission method. Please refer to FIG. 3 , which is a schematic diagram of a method for transmitting a touch pen signal according to Embodiment 1 of the present invention. In this embodiment, the signal sent by the touch pen to the touch screen end includes a first touch signal and a second touch signal, where the first touch signal is used to calculate the touch screen coordinate position where the touch pen is currently located and the timing synchronization for the pen end and the screen end, The second touch signal is used to transmit the pressure value of the pen tip detected by the pen end and the button value of the button on the touch pen. The above buttons are used to set the writing mode of the touch pen, the writing font, and the like, such as the body, the script, the song, and the like in the writing font.

The touch pen signal transmission method provided in this embodiment includes the following steps:

Step S101: detecting whether there is pressure or a button press. If yes, go to step S102; otherwise, go to step S105.

In each cycle, the pen end first detects whether the touch pen is under pressure or whether the button on the touch pen is pressed.

Step S102: Send a first touch signal.

In this step, detecting that the touch pen tip is under pressure or pressing a button on the touch pen, the first touch signal is sent, and the first touch signal is used to calculate the touch screen coordinate position where the touch pen is currently located and used for the touch pen and Timing synchronization of the touch controller. In this embodiment, the first touch signal adopts a fixed frequency, and its continuous transmission time is 1.2 ms.

Step S103: The pressure value and/or the key value are encoded.

In this step, the detected pressure value of the tip of the touch pen and/or the key value of the button on the touch pen are encoded.

Step S104: Send a second touch signal according to the code.

The second touch signal may be transmitted by using a binary coded value, or may be sequentially transmitted by using a plurality of pulses, or may be transmitted by using a plurality of pulses. In this embodiment, the second touch signal is transmitted in a binary coded value manner.

Please refer to FIG. 4 , which is a schematic diagram of a touch signal provided by Embodiment 1 of the present invention. In this embodiment, the first touch signal and the second touch signal have the same frequency, and the scanning period (ie, detecting whether there is pressure or the period of the button) is 10 ms. During one scan period, if there is pressure or a button, the first touch signal continues to be transmitted for 1.2 ms; after the first touch signal is sent, 700 us starts to send the second touch signal, and the binary code value of the second touch signal is sequentially transmitted in time units. A Bit bit, the time unit is 300us. When the value of the Bit bit is 1, the pulse with a duration of 80us is sent within 300us, and the remaining 220us does not send a pulse. When the value of the Bit bit is 0, it is within 300us. No pulses are sent.

After detecting the first touch signal of 1.2 ms long, the touch controller (ie, the screen control chip) switches to detect the second touch signal, and at this time, only scans the horizontal line X or the vertical line Y of the touch sensor. In the embodiment, scanning horizontal line X is used, and one frame is scanned every 100 us, and a total of three frames are scanned in a 300 us time unit corresponding to the pen end. When there is no pulse sent by the pen end in a time unit, the screen will detect “0, 0, 0”, that is, the code sent by this time unit is 0. When there is a continuous transmission of 80us pulse in a time unit, the data detected by the screen may have two cases: the 180us pulse time is just one scan period of the screen end, and one of the three frames of the screen end data is 1, such as " 1,0,0"; 2 If there is a deviation between the pen end and the screen end timing, the 80us pulse is just between the two consecutive frames of the screen, and there are two consecutive 1s in the three frames of the screen, such as "1" , 1,0". Both of the above cases indicate that the data sent in this time unit is 1.

Since the signal transmission circuit of the touch pen has much longer power consumption when there is a pulse output than when there is no pulse output, in order to save power, the following processing is required: in the binary coding mode, the value of the Bit bit should be minimized. The probability of 1 increases the encoding probability of the Bit bit to 0. In this embodiment, the pressure and the button value have a total of 32 code values, that is, the 5Bit bit is coded, wherein codes 0 to 3 are assigned to the two buttons on the touch pen, and 4 to 31 are the pressure levels of the touch pen. In the actual use of the touch pen, the time of the pressure level is much smaller than the time of the pressure level. The time of the button is much smaller than the time without the button. Therefore, in practical applications, the pressure of the pressure level should be reduced. The number of 1s in the binary code value corresponding to the value reduces the number of 1s in the binary code value corresponding to the button value without the button. Therefore, in order to reduce the number of 1s in the transmission code during normal use, the pressure value and the key value are encoded as shown in FIG.

Step S105: Enter a power saving state and wait for the next detection time to arrive.

In this step, after the touch pen is not under pressure or the button on the touch pen is detected to be pressed or the second touch signal is transmitted, the power saving state is entered, and the next detection time is awaited.

After step S105, the process returns to step S101.

In summary, in step S101, the detection results are as follows:

1 only pressure: firstly send a first touch signal for calculating the coordinate position and timing synchronization of the touch pen currently, after transmitting the first touch signal, encoding the pressure value, and then transmitting the corresponding second touch according to the encoded value signal;

2 Only the button: that is, the pressure value is 0, but there is a button, indicating that the touch pen is in the floating operation state at this time, there is no touch operation, but there is a button operation. Firstly, the first touch signal is sent to calculate the coordinate position and timing synchronization of the touch pen, and after the first touch signal is sent, the button value is encoded, and then the corresponding second touch signal is sent according to the encoded value;

3 There are pressures and buttons at the same time: firstly, the first touch signal is sent to calculate the coordinate position and timing synchronization of the touch pen, and after the first touch signal is sent, the pressure value and the key value are encoded, and then according to the code. Transmitting a corresponding second touch signal;

4 The pressure value is 0, and there is no button press: indicating that the touch pen is in the no-operating state at this time, the first touch signal and the second touch signal are not sent, and the power saving state is directly entered, and the next detection time is started. Next test.

The embodiment also provides a touch pen, which uses the above method for signal transmission.

This embodiment also provides a touch controller signal detection method. Please refer to FIG. 6 , which is a schematic diagram of a method for detecting a signal of a touch controller according to Embodiment 1 of the present invention. In this embodiment, the touch controller signal detection method includes the following steps:

Step S201: detecting the first touch signal, and performing timing synchronization of the touch pen and the touch controller according to the detected start position or end position of the first touch signal.

Corresponding to the touch pen signal transmission method described above, the touch controller first detects the first touch signal, performs timing synchronization according to the start or end position of the first touch signal, detects the second touch signal, and decodes the second touch signal to obtain Pressure value and key value data. In order to accurately detect the first touch signal and the second touch signal, the touch controller needs to synchronize the pen end and the screen end timing according to the start or end position of the first touch signal in real time. When the first touch signal is detected, it is detected by the time unit, the time unit is 500 us, and the horizontal electrode line X and the vertical line Y of the touch sensor are scanned once in one time unit. There are three possible situations at this time:

1 The pulse timing of the pen end is ahead of the detection timing of the screen end: Please refer to FIG. 7 , which is a schematic diagram of detecting when the pulse timing of the touch pen is ahead of the detection timing of the touch controller in Embodiment 1 of the present invention, when the screen end starts detecting The pulse of the pen end has been sent for a period of time. This screen can only detect the second half of the pulse of the pen end pulse. In order to be fully synchronized, the next detection of the screen end needs to start early: if the detected signal length is N Us, the advance time is (1200-N+500) us, and the starting position of the pen pulse signal can be adjusted to the 500us position after the start of sampling.

2 The detection timing of the screen is ahead of the pulse timing of the pen end: Please refer to FIG. 8 , which is a schematic diagram of the detection when the pulse timing of the touch pen lags behind the detection timing of the touch controller in the embodiment 1 of the present invention. When the detection is completed, the pen end starts to send pulses. This scan screen can only detect the first half of the signal sent by the touch pen. In order to be fully synchronized, the next detection of the screen end needs to be postponed: if the detected signal length For N Us, because the horizontal line X and the vertical line Y of the touch sensor are scanned four times in total, the scanning time is 500us×4=2000 Us, the delay time is (2000-500-N) us, the next time you can adjust the starting position of the pen pulse signal to 500us position after the start of sampling.

After the screen is started, the touch pen starts to send the pulse, and the pulse of the touch pen continues to be in the process of detecting the screen: Referring to FIG. 9 , the pulse timing and the touch controller of the touch pen in Embodiment 1 of the present invention are shown. The detection diagram of the detection timing synchronization, at this time, the two ends are synchronized, and the next detection time of the screen end does not need to be adjusted.

Therefore, in this step, when the pulse timing of the touch pen is ahead of the detection timing of the touch controller, the touch controller advances the next signal detection; when the detection timing of the touch controller is ahead of the pulse timing of the touch pen, touch The controller delays the next signal detection.

Step S202: detecting the second touch signal, decoding the detected second touch signal, and obtaining the pressure value received by the touch pen and/or the button value of the button on the touch pen.

In this step, the second touch signal is sent in a binary coded value manner, and the second touch signal is detected in a time unit. The time unit is 300 us, and the horizontal line X or the vertical line Y of the touch sensor is scanned once every 100 us, one time unit The horizontal line X or the vertical line Y of the touch sensor is scanned three times. In the embodiment, the method of scanning the horizontal line X is adopted.

The embodiment further provides a touch controller that performs signal detection using the above method.

In this embodiment, by detecting the pressure or the button, when the pressure or the button is pressed, the first touch signal is first sent to calculate the touch pen coordinates and the timing synchronization is performed, and then the pressure value and/or the button value are encoded to send the second touch signal, and the second touch signal is transmitted. The pressure value and/or the button value of the two touch signals can realize various application functions of the touch pen.

Example 2:

The embodiment provides a touch pen and a signal transmission method thereof, a touch controller and a signal detecting method thereof. The difference between this embodiment and Embodiment 1 is that the second touch signal is sequentially transmitted by using a plurality of pulses. Only the differences between the embodiment and the embodiment 1 will be described below.

In this embodiment, the second touch signal is combined by two frequencies and is transmitted in two time units. Specifically, the second touch signal includes a first pulse and a second pulse, and sequentially transmits the first pulse and the second pulse in a time unit, the time unit is 300 us, and the first pulse is sent after 700us is sent after the first touch signal is sent, the first The continuous transmission time of the pulse is 100us, and the second pulse is started after 100us is transmitted. The continuous transmission time of the second pulse is 100us; the frequency of the first touch signal is 500KHz. The first pulse and the second pulse of different frequencies are combined into a plurality of codes, and the number of codes is determined by the number of frequencies. For example, the frequency of the first pulse can be selected from M frequencies, and the frequency of the second pulse can be from N. Selecting among the frequencies, a total of M × N coded values can be realized.

Please refer to FIG. 10 , which is a waveform diagram of a touch signal provided by Embodiment 2 of the present invention. Send 1.2 ms first if there is pressure or button in each scan cycle The 500K pulse F is used as the first touch signal. After waiting for 700us, the first pulse Fi of 100us is transmitted, and after waiting for 100us, the second pulse Fj of 100us is transmitted. In this embodiment, there are 32 pressure and button codes, wherein 0 to 3 are key value codes, and 4 to 31 are pressure value codes. In order to be able to transmit 32 codes, the frequencies of the first pulse Fi and the second pulse Fj are respectively The six frequency values are selected, and the code table is as shown in FIG.

Correspondingly, the touch controller first detects the first touch signal of 1.2 ms, detects two frequency values in the second touch signal, and solves the corresponding code value by combining the detected frequency values.

Example 3:

The embodiment provides a touch pen and a signal transmission method thereof, a touch controller and a signal detecting method thereof. The difference between this embodiment and Embodiment 1 is that the second touch signal is transmitted by using a plurality of pulses.

Please refer to FIG. 12 , which is a schematic diagram of a touch signal provided by Embodiment 3 of the present invention. In this embodiment, the second touch signal is superimposed by pulses F1, F2, ..., Fx of a plurality of frequencies, and is transmitted in one time unit, and the frequency of the output pulse Sx is a frequency superposition of F1, F2, ..., Fx, and multiple frequency fingers The number of frequencies is greater than or equal to 2. In a preferred embodiment of the present invention, the second touch signal is superimposed with two frequencies. Referring to FIG. 13 , it is a waveform diagram of a preferred embodiment of the touch signal in FIG. 12 , wherein the second touch signal includes the first Pulse F1 (triangle identification) and second pulse F2 (diamond identification), which are mixed in the time domain to form a touch signal (square mark). The touch pen sends F1 and F2 according to the time unit superposition, and the time unit is 300us. After the first touch signal is sent, 700us starts to send F1 and F2 at the same time, and the F1 and F2 are superimposed and output through the peripheral circuit, and the continuous transmission time of F1 and F2 is sent. It is 100us. F1 and F2 of different frequencies are combined into multiple codes, and the number of codes is determined by the number of frequencies. For example, the frequency of F1 can be selected from M frequencies, and the frequency of F2 can be selected from N frequencies. Implement M×N code values. In this embodiment, the frequency of the first touch signal is 500 kHz; the frequencies of F1 and F2 are respectively selected from six frequency values, and F1 and F2 of different frequencies are combined into a plurality of codes. In one scan cycle, the touch controller first detects the pressure value and the button. If there is a pressure value or a button value, the first touch signal is sent 1.2ms first, and then the pressure value or the button value is converted into an encoded value, and the search is performed in the code table. The frequency values of F1 and F2 can be obtained. After the transmission of 1.2ms is completed, wait for 700us. At the same time, F1 and F2 are output from the two pulse output ports, and the two frequencies are superimposed and outputted to the transmitting circuit through the peripheral circuit. The transmission circuit block diagram of the second touch signal is as shown in FIG. The code table is shown in Figure 15.

After the screen end detects the 1.2ms first touch signal, it waits for 700us to detect the second touch signal, detects two different frequencies, and obtains the code value sent by the touch pen according to the combination of the two frequencies.

In the above embodiment, the frequency and the time are mainly designed according to the sampling frequency range of the chip and the sampling time (500 us per cycle) used in the embodiment, but the present invention is not limited to the above frequency and time, as long as the present invention can be implemented. The purpose is to adopt other frequency and time technical solutions.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A touch pen signal transmission method, characterized in that the method comprises:

Detecting whether the tip of the touch pen is under pressure or whether the button on the touch pen is pressed;

Detecting that the touch pen tip is subjected to pressure or a button press on the touch pen, and transmitting a first touch signal, the first touch signal is used to calculate a touch screen coordinate position where the touch pen is currently located, and a touch pen and a touch controller for the touch pen Timing synchronization

The detected pressure value of the touch pen tip and/or the button value of the button on the touch pen are encoded, and the second touch signal is transmitted according to the code.
The method according to claim 1, wherein the second touch signal is transmitted in a binary coded value manner, or is sequentially transmitted using a plurality of pulses, or is transmitted by using a plurality of pulses.
The method according to claim 2, wherein the first touch signal adopts a fixed frequency, and the continuous transmission time of the first touch signal is a first time period;

When the second touch signal is transmitted in a binary coded value manner:

After the first touch signal is sent, the second touch signal is sent after the first interval time, and each bit bit of the binary code value of the second touch signal is sequentially transmitted according to the sending time unit. When the value of the Bit bit is 1, Transmitting a pulse whose duration is the second time period in the transmission time unit, and transmitting the time unit minus the third time period remaining in the second time period without transmitting a pulse. When the value of the Bit bit is 0, the transmission time unit Do not send pulses internally; or,

When the second touch signal is sequentially transmitted by using multiple pulses:

The second touch signal includes a first pulse and a second pulse, and the first pulse and the second pulse are sequentially transmitted according to the sending time unit, and after the first touch signal is sent, the first pulse is started to be sent after the first interval, the first pulse The continuous transmission time is the first pulse time period, and after the end of the first pulse transmission, the second pulse is sent after the second interval time, and the continuous transmission time of the second pulse is the second pulse time period; or

When the second touch signal is transmitted by using multiple pulse superpositions:

The second touch signal includes a first pulse and a second pulse, and the first pulse and the second pulse are superimposed and transmitted according to the sending time unit. After the first touch signal is sent, the first pulse and the second pulse are simultaneously sent after the first interval time is started. The pulse is sent by superimposing and outputting the first pulse and the second pulse through the peripheral circuit, and the continuous transmission time of the first pulse and the second pulse is the first second pulse period.
The method according to claim 2, wherein when said second touch signal is transmitted in a binary coded value: at a pressure value of the detected tip of the touch pen and/or a button on the touch pen In the step of encoding the key value, the number of 1 in the binary code value corresponding to the pressure value having a large pressure level is reduced, and the number of 1 in the binary code value corresponding to the button value without the button is reduced.
The method according to claim 3, wherein the frequencies of the first pulse and the second pulse are respectively selected from a plurality of preset frequency values, and the first pulse and the second pulse of different frequencies are combined into a plurality of codes.
A touch pen characterized in that the touch pen performs signal transmission using the method according to any one of claims 1 to 5.
A touch controller signal detecting method, the method comprising:

Detecting the first touch signal, and performing timing synchronization of the touch pen and the touch controller according to the detected start position or end position of the first touch signal;

The second touch signal is detected, and the detected second touch signal is decoded to obtain a tip pressure value of the touch pen and a button value.
The method according to claim 7, wherein when the first touch signal is detected, the first detection time unit detects that the horizontal electrode line X and the vertical line Y of the touch sensor are scanned once in a first detection time unit. .
The method according to claim 7 or 8, wherein when the timing of synchronizing the touch pen with the touch controller is performed, when the pulse timing of the touch pen is ahead of the detection timing of the touch controller, the touch controller will be next time Signal detection in advance; or,

When the detection timing of the touch controller is ahead of the pulse timing of the touch pen, the touch controller delays the next signal detection.
The method according to claim 9, wherein when the second touch signal is transmitted in a binary coded value manner, the second touch signal is detected by the second detection time unit, and the touch is scanned three times in a second detection time unit. The horizontal line X or the vertical line Y of the sensor; or,

When the second touch signal is sequentially transmitted or superimposed and transmitted by using a plurality of pulses: the second touch signal includes a first pulse and a second pulse that are sequentially transmitted or a first pulse and a second pulse that are superimposed and transmitted, by detecting The first pulse frequency value and the second pulse frequency value solve corresponding coding values.
A touch controller characterized in that the touch controller performs signal detection using the method according to any one of claims 7 to 10.