Active handwriting pen, touch control method and display device

Abstract

The invention provides an active handwriting pen, a touch control method and a display device. The active stylus includes: a stylus body; the capacitive pen point is arranged at one end of the handwriting pen body; the touch sensor is in transmission connection with the capacitive pen point and is used for detecting the touch state of the capacitive pen point; the electromagnetic induction coil is arranged on the handwriting pen body; and the control circuit board is electrically connected with the touch sensor and the electromagnetic induction coil, and the control circuit board is configured to drive the electromagnetic induction coil to receive / transmit an electromagnetic touch signal according to a detection result of the touch sensor. According to the active handwriting pen, the capacitive pen point and the electromagnetic induction coil are arranged, so that touch control can be carried out at the same time in two modes of capacitive touch control and electromagnetic interaction in the touch control process, and the touch control effect can be improved.

Description

Technical Field

[0001] The present application relates to the field of touch technology, and in particular to an active stylus, a touch control method and a display device. Background Art

[0002] Due to the advantages of convenient operation, the application demand of stylus in office, painting and other scenes is increasing. Existing stylus mainly includes capacitive stylus and electromagnetic stylus. Capacitive stylus will affect the display function. Therefore, in order to avoid affecting the normal display, it needs to be divided into multiple intervals. This causes discontinuous capacitive touch data and affects the accuracy of use, especially at high refresh rates. Electromagnetic touch can be recognized continuously and is not affected by the display time. However, electromagnetic touch products cannot be controlled by fingers, which is inconvenient to use. It can be seen that the existing stylus is inconvenient to use. Summary of the invention

[0003] Embodiments of the present invention provide an active stylus, a touch control method and a display device to improve the convenience of handwriting operation using the stylus.

[0004] To solve the above problems, the present invention is achieved as follows:

[0005] In a first aspect, the present invention provides an active stylus pen, comprising:

[0006] Stylus body;

[0007] A capacitive pen tip, arranged at one end of the stylus body;

[0008] A touch sensor, drivingly connected to the capacitive pen tip, for detecting a touch state of the capacitive pen tip;

[0009] An electromagnetic induction coil, disposed on the stylus body;

[0010] A control circuit board is electrically connected to the touch sensor and the electromagnetic induction coil, and the control circuit board is configured to drive the electromagnetic induction coil to receive / transmit an electromagnetic touch signal according to a detection result of the touch sensor.

[0011] Some of the embodiments further include a pen tip holder, wherein the pen tip holder is used to clamp the capacitive pen tip, and one end of the pen tip holder away from the capacitive pen tip abuts against the touch sensor.

[0012] In some of the embodiments, the electromagnetic induction coil is fixed to the capacitive pen tip between an end of the capacitive pen tip away from the pen tip holder and the pen tip holder.

[0013] In a second aspect, an embodiment of the present invention provides a touch control method, which is applied to a display device, and the method comprises the following steps:

[0014] receiving a touch operation on the display device;

[0015] Respond to a touch control instruction of the stylus pen according to the touch operation, wherein the control instruction includes a capacitive touch instruction and an electromagnetic touch instruction, and the stylus pen is an active stylus as described in any one of the first aspects.

[0016] In some of the embodiments, each frame display period of the display device includes at least one capacitive touch sub-period and at least one electromagnetic touch sub-period, and the display device responds to capacitive touch instructions in the capacitive touch sub-period and responds to electromagnetic touch instructions in the electromagnetic touch sub-period.

[0017] In some of the embodiments, each frame display period of the display device includes a plurality of capacitive touch sub-periods and a plurality of electromagnetic touch sub-periods that are alternately arranged in sequence.

[0018] In some embodiments, after responding to the handwritten pen touch control instruction according to the touch operation, the method further includes:

[0019] Respectively identifying the capacitive touch handwriting corresponding to the capacitive touch instruction and the electromagnetic touch handwriting corresponding to the electromagnetic touch instruction;

[0020] When the handwriting difference between the capacitive touch handwriting and the electromagnetic touch handwriting is greater than a preset difference threshold, the duration ratio of the capacitive touch sub-period and the electromagnetic touch sub-period is iteratively adjusted until the handwriting difference is not greater than the preset difference threshold.

[0021] In some embodiments, after receiving a touch operation on the display device, the method further includes:

[0022] In the case where no valid response is received from the stylus, the touch recognition mode is switched to the capacitive touch mode. In the capacitive touch mode, the duration of the electromagnetic touch sub-period in each frame display period of the display device is zero.

[0023] In some embodiments, after receiving a touch operation on the display device, the method further includes:

[0024] determining a refresh rate of the display device;

[0025] When the refresh frequency is greater than a preset frequency threshold, the touch recognition mode is switched to an electromagnetic touch mode, in which the duration of the capacitive touch sub-period in each frame display period of the display device is 0;

[0026] When the refresh frequency is not greater than the preset frequency threshold, the step of responding to the handwritten pen touch control instruction according to the touch operation is performed.

[0027] In a third aspect, an embodiment of the present invention provides a display device, wherein the display device is configured to execute the touch control method described in any one of the second aspects.

[0028] The active stylus in the embodiment of the present invention can simultaneously perform touch control by using capacitive touch and electromagnetic interaction during the touch process by providing a capacitive pen tip and an electromagnetic induction coil, which helps to improve the touch control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0030] Figure 1 is a schematic structural diagram of an active stylus in one embodiment of the present invention;

[0031] Figure 2 is a schematic flow chart of a touch control method in one embodiment of the present invention;

[0032] Figure 3 is a touch control timing diagram of a display device in one embodiment of the present invention;

[0033] Figure 4 is a touch control timing in another embodiment of the present invention;

[0034] Figure 5 is a flow chart of a touch control method in another embodiment of the present invention;

[0035] Figure 6 is a schematic diagram of the process of a touch control method in another embodiment of the present invention;

[0036] Figure 7 FIG. 4 is a flowchart of a touch control method in another embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms "first", "second" etc. in the embodiments of the present invention are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. In addition, the terms "include" and "have" and any variation thereof are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment. In addition, "and / or" is used in the present application to represent at least one of the connected objects, such as A and / or B and / or C, which represents 7 situations including single A, single B, single C, and A and B all exist, B and C all exist, A and C all exist, and A, B and C all exist.

[0039] An embodiment of the present invention provides an active stylus pen.

[0040] like Figure 1 As shown, in one embodiment, the active stylus 100 includes a stylus body, and a capacitive pen tip 101 is provided at one end of the stylus body. The capacitive pen tip 101 can transfer charges to the touch block of the touch display panel in the form of voltage coding to realize capacitive touch control.

[0041] The capacitive pen tip 101 is transmission-connected to the touch sensor 104. In one embodiment, the active stylus 100 further includes a pen tip holder 103, which is used to clamp and fix the capacitive pen tip 101. The pen tip holder 103 and the touch sensor 104 are connected, and one end of the pen tip holder 103 away from the capacitive pen tip 101 abuts against the touch sensor 104, thereby realizing the transmission connection between the capacitive pen tip 101 and the touch sensor 104.

[0042] The touch sensor 104 is used to detect the touch state of the capacitive pen tip 101. It can be understood that when the user performs a touch operation through the stylus, the capacitive pen tip 101 contacts the display panel and applies a force to the movable pen tip holder 103. In this way, the touch sensor 104 can detect the touch state by detecting the force between itself and the pen tip holder 103.

[0043] In some embodiments, in order to prevent the touch sensor 104 from being touched, a sensor protection member 105 may be further provided to support and protect the touch sensor 104 .

[0044] The active stylus 100 also includes an electromagnetic induction coil 102, which can form a signal frequency through an internal LC (inductor capacitor) oscillation circuit, and transmit data with the display device through an agreed phase and the position of the electromagnetic touch block to determine the point where the pen tip lands, and transmit pressure information through a protocol agreement, thereby realizing electromagnetic touch control.

[0045] It can be understood that the technical solution of this embodiment adds an electromagnetic induction coil 102 at the moving pen tip holder 103 to achieve the working process of electromagnetic capacitance dual touch, and can realize electromagnetic capacitance dual communication.

[0046] In some of the embodiments, the electromagnetic induction coil 102 is fixed to the capacitive pen tip 101 between an end of the capacitive pen tip 101 away from the pen tip holder 103 and the pen tip holder 103 .

[0047] The active stylus 100 further includes a control circuit board 106 , which is electrically connected to the touch sensor 104 and the electromagnetic induction coil 102 . The control circuit board 106 is configured to drive the electromagnetic induction coil 102 to receive / transmit electromagnetic touch signals according to the detection result of the touch sensor 104 .

[0048] It should be understood that the active stylus 100 can communicate with the display device via the control circuit board 106 , and data transmission can be performed by means including but not limited to Bluetooth.

[0049] Generally speaking, the data transmission between the display device and the active stylus 100 is usually transmitted in the form of square waves. In the uplink data transmission process from the display device to the active stylus 100, 8-bit source code is usually used for DSSS extension command transmission. During implementation, the manufacturer forms an extension code based on the spread spectrum matching with the source code bit number, mainly transmitting screen refresh rate information, working frequency selection, etc.

[0050] In one embodiment, the specific frequency control selection settings are shown in Table 1 below:

[0051] Table 1: Data transmission frequency

[0052] Hea3 Hea2 Hea1 Hea0 F2 F1 F0 Mode Hz Setting 1 * * * * 0 0 0 * 60 Setting 2 * * * * 0 0 1 * 90 Setting 3 * * * * 0 1 0 * 120 Setting 4 * * * * 0 1 1 * 144 Setting 5 * * * * 1 0 0 * 165

[0053] Among them, Hea2 and Hea3 are reserved extension instructions. In the touch point calibration state, the operating frequency is selected according to Hea0&Hea1, and is mainly adjusted by the crystal oscillator multiplication and system division of the active stylus 100. The number and spacing of touch pits are processed according to the agreement of F0~F1, and different pit positions are allocated. The first and last bits of DSSS spread spectrum are used for clock calibration to align the clock between the touch device and the touch controller to achieve timed sampling. The voltage is set to a capacitive coding voltage ≥40V, and the electromagnetic touch sensing voltage is a TTL level.

[0054] In the downlink data transmission process from the active stylus 100 to the display device, BPSK, QDPSK and other encodings are usually used for transmission. The downlink transmission protocol of the active stylus 100 generally includes pressure information, key information, pen power information, etc. The pressure information is reflected in the capacitance and electromagnetic dual protocol transmission.

[0055] In one of the embodiments, the capacitive touch protocol and the electromagnetic touch protocol can be set with reference to Table 2 and Table 3. Obviously, during implementation, the corresponding touch protocols can be adjusted in a targeted manner as needed.

[0056] Table 2: Capacitive touch protocol

[0057]

[0058]

[0059] Table 3: Electromagnetic touch protocol

[0060]

[0061]

[0062] Interactive control instructions can be used to transmit data in the BLK interval, and can be transmitted according to the reserved position of the protocol.

[0063] By reasonably allocating different data to the electromagnetic capacitor protocol, all data can be transmitted in double if the hardware supports it.

[0064] In Table 2 and Table 3 above, both the capacitive touch protocol and the electromagnetic touch protocol are 3-bit protocols. When implemented, they can be adjusted as needed. That is to say, the corresponding transmission protocol is not limited to 3 bits. To ensure the stability of data transmission, each TP pit can transmit 12-bit data to meet different expansion requirements. This protocol contains a CRC file to ensure the integrity of the data packet. It should be understood that the electromagnetic touch protocol and the capacitive touch protocol can transmit different bit data of the same function respectively to meet the transmission of more effective data.

[0065] An embodiment of the present invention provides a touch control method applied to a display device.

[0066] like Figure 2 As shown, in one embodiment, the method includes the following steps:

[0067] Step 201: receiving a touch operation on the display device;

[0068] Step 202: responding to a touch control instruction of the stylus according to the touch operation, wherein the control instruction includes a capacitive touch instruction and an electromagnetic touch instruction, and the stylus is an active stylus as described in any one of the first aspects.

[0069] In the technical solution of this embodiment, since the active stylus includes a capacitive pen tip and an electromagnetic induction coil, the active stylus can realize the combination of electromagnetic touch and capacitive touch, and the display interval segment can be used to realize the alternating electromagnetic and capacitive protocol touch, which can realize the complementary pressure sense and the complementary reporting rate, and increase the effective data volume. At the same time, it can also identify disturbances and calibrate handwriting through the comparison of electromagnetic touch data and capacitive touch data, realize touch pit adjustment, reduce interference and improve touch control effect.

[0070] In some of the embodiments, each frame display period of the display device includes at least one capacitive touch sub-period and at least one electromagnetic touch sub-period, and the display device responds to capacitive touch instructions in the capacitive touch sub-period and responds to electromagnetic touch instructions in the electromagnetic touch sub-period.

[0071] like Figure 3 As shown, in this embodiment, the transmission time period of touch data is divided into several touch sub-periods, wherein CT is a capacitive touch sub-period, and ET is an electromagnetic touch sub-period. The capacitive touch sub-period needs to be adjusted according to the display period to avoid affecting the normal display state of the display device. The time period outside the capacitive touch sub-period can be used as an electromagnetic touch sub-period for the transmission of electromagnetic touch data. In this way, the display time can be fully utilized for the transmission of touch data, thereby realizing the combination of capacitive touch and electromagnetic touch.

[0072] During implementation, the display time period of the display device is divided into several time blocks as capacitive touch sub-periods and electromagnetic touch sub-periods, and the entire touch section is equally divided according to a specific display refresh rate.

[0073] In some of the embodiments, the durations of the capacitive touch sub-period and the electromagnetic touch sub-period are equal, and each frame display period includes a plurality of capacitive touch sub-periods and a plurality of electromagnetic touch sub-periods that are alternately arranged in sequence.

[0074] In order to realize the capacitive touch function, the time setting time of the capacitive touch sub-period is required to be ≤180us, and the electromagnetic touch time is evenly divided into the remaining time period.

[0075] To ensure the display effect, the capacitive pit adopts a maximum 180us design, and the operating frequency of the capacitive touch control is 100K~500K. Theoretically, each touch pit is 18~90 square wave signals, and each pit transmits data at the frequency agreed by the capacitive pen, which is not specifically limited here.

[0076] Calculated based on the 500K operating frequency of the electromagnetic touch device, the maximum data transmission of a single pit (evenly divided into the remaining positions) is 500 square wave signals. Similarly, the maximum amount of propagated data is calculated based on the touch pit time at different refresh rates; electromagnetic capacitors can use two different frequencies for data transmission to ensure maximum touch performance of the product.

[0077] like Figure 3 As shown, in an exemplary embodiment, CT1~CT13, the minimum CT touch time period is 10; the touch data window changes according to the refresh rate. For example, when the refresh frequency of the display device is 60Hz or 90Hz, the capacitive touch sub-periods of each frame image can be set to 13, and the refresh frequency of the display device is 120Hz refresh rate, and the capacitive touch sub-periods of each frame image can be set to 10.

[0078] Taking 60Hz data transmission as an example, the whole frame time is 16666.7us, the instruction interval is about 614(+200us margin)us, the CT occupancy time is 180*13=2340us, the ET occupancy time is 13512.7us, and each electromagnetic touch pit occupies 1039.4us. A margin of 20us is reserved for each pit.

[0079] The dual touch setting of capacitive touch and electromagnetic touch in this embodiment ensures the touch time period, fully utilizes the entire display time, and is designed to be compatible with finger touch. When external contact is made with other electromagnetic devices, the capacitive electromagnetic touch protocol can fully utilize the entire display time. The touch data can theoretically be doubled, greatly improving the effective touch data, and achieving a significant improvement in pressure sensitivity accuracy and handwriting reporting.

[0080] In some embodiments, after receiving a touch operation on the display device, the method further includes:

[0081] determining a refresh rate of the display device;

[0082] When the refresh frequency is greater than a preset frequency threshold, the touch recognition mode is switched to an electromagnetic touch mode, in which the duration of the capacitive touch sub-period in each frame display period of the display device is 0;

[0083] When the refresh frequency is not greater than the preset frequency threshold, the step of responding to the handwritten pen touch control instruction according to the touch operation is performed.

[0084] like Figure 4 As shown, for example, in one embodiment, the preset frequency threshold may be 120Hz. When the refresh frequency of the display device is greater than 120Hz, such as 144Hz or 165Hz, the duration of each frame of the image is too short to meet the duration requirement of the capacitive touch. At this time, the touch mode is switched to electromagnetic scanning. In other words, electromagnetic touch is used throughout the entire period, the receiving time period of the touch screen is consistent with the data sending time period of the stylus, the clock is calibrated through the uplink protocol, and each frame is synchronized to ensure stable data reception.

[0085] In some embodiments, after responding to the handwritten pen touch control instruction according to the touch operation, the method further includes:

[0086] Respectively identifying the capacitive touch handwriting corresponding to the capacitive touch instruction and the electromagnetic touch handwriting corresponding to the electromagnetic touch instruction;

[0087] When the handwriting difference between the capacitive touch handwriting and the electromagnetic touch handwriting is greater than a preset difference threshold, the duration ratio of the capacitive touch sub-period and the electromagnetic touch sub-period is iteratively adjusted until the handwriting difference is not greater than the preset difference threshold.

[0088] like Figure 5 As shown, in the technical solution of this embodiment, capacitive touch and electromagnetic touch respectively transmit effective data.

[0089] When the stylus needs to be calibrated, the handwriting data of different transmission methods are first identified and compared. If the difference between the handwriting data of the two methods is large, the touch controller sends an instruction to the stylus to control the stylus to adjust the working frequency, that is, to adjust the duration of the capacitive touch sub-period and the electromagnetic touch sub-period until the handwriting difference fluctuation is minimized. At this time, the touch controller stores the optimal working frequency for subsequent transmission to other touch devices.

[0090] If no calibration is required, the saved default configuration can be directly called.

[0091] like Figure 6 and Figure 7As shown, in this embodiment, when the display device detects a touch operation, it sends a search instruction to find the stylus. If it can be found, it interacts with the stylus for data with reference to the above embodiment. For example, it sends instruction information such as the working status of the display to the stylus. The stylus responds to the instruction information, allocates the touch time period according to the agreement, and receives touch data for touch control.

[0092] In some embodiments, after receiving a touch operation on the display device, the method further includes:

[0093] In the case where no valid response is received from the stylus, the touch recognition mode is switched to the capacitive touch mode. In the capacitive touch mode, the duration of the electromagnetic touch sub-period in each frame display period of the display device is zero.

[0094] If the stylus does not respond effectively, that is, the stylus does not respond or the response times out, it is confirmed as passive capacitive touch, and the display device switches the detection mode. This state can be understood as the user performing a touch operation with a finger, and touch recognition can be performed in a conventional capacitive touch mode.

[0095] An embodiment of the present invention provides a display device, and the display device is configured to execute any one of the above touch control methods.

[0096] The display device of this embodiment can cooperate with the active stylus to implement the various steps of the above touch control method embodiment and can achieve the same or similar technical effects, which will not be described in detail here.

[0097] The above is a preferred implementation of the embodiment of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present disclosure. These improvements and modifications should also be regarded as the scope of protection of the present disclosure.

Claims

1. An active stylus pen, characterized in that: include: Stylus body; A capacitive pen tip, arranged at one end of the stylus body; A touch sensor, drivingly connected to the capacitive pen tip, for detecting a touch state of the capacitive pen tip; An electromagnetic induction coil, disposed on the stylus body; A control circuit board is electrically connected to the touch sensor and the electromagnetic induction coil, and the control circuit board is configured to drive the electromagnetic induction coil to receive / transmit an electromagnetic touch signal according to a detection result of the touch sensor.

2. The active stylus pen according to claim 1, characterized in that: It also includes a pen tip holder, which is used to clamp the capacitive pen tip, and one end of the pen tip holder away from the capacitive pen tip abuts against the touch sensor.

3. The active stylus pen according to claim 2, characterized in that: The electromagnetic induction coil is fixed to the capacitive pen tip between an end of the capacitive pen tip away from the pen tip holder and the pen tip holder.

4. A touch control method, applied to a display device, characterized in that: The method comprises the following steps: receiving a touch operation on the display device; A touch control instruction of the stylus pen is responded to according to the touch operation, wherein the control instruction includes a capacitive touch instruction and an electromagnetic touch instruction, and the stylus pen is an active stylus pen according to any one of claims 1 to 3.

5. The method according to claim 4, characterized in that Each frame display period of the display device includes at least one capacitive touch sub-period and at least one electromagnetic touch sub-period. The display device responds to a capacitive touch instruction in the capacitive touch sub-period and to an electromagnetic touch instruction in the electromagnetic touch sub-period.

6. The method according to claim 5, characterized in that Each frame display period of the display device includes a plurality of capacitive touch sub-periods and a plurality of electromagnetic touch sub-periods which are alternately arranged in sequence.

7. The method according to claim 6, characterized in that After responding to the handwritten pen touch control instruction according to the touch operation, the method further includes: Respectively identifying the capacitive touch handwriting corresponding to the capacitive touch instruction and the electromagnetic touch handwriting corresponding to the electromagnetic touch instruction; When the handwriting difference between the capacitive touch handwriting and the electromagnetic touch handwriting is greater than a preset difference threshold, the duration ratio of the capacitive touch sub-period and the electromagnetic touch sub-period is iteratively adjusted until the handwriting difference is not greater than the preset difference threshold.

8. The method according to any one of claims 4 to 6, characterized in that After receiving the touch operation on the display device, the method further includes: In the case where no valid response is received from the stylus, the touch recognition mode is switched to the capacitive touch mode. In the capacitive touch mode, the duration of the electromagnetic touch sub-period in each frame display period of the display device is zero.

9. The method according to any one of claims 4 to 6, characterized in that After receiving the touch operation on the display device, the method further includes: determining a refresh rate of the display device; When the refresh frequency is greater than a preset frequency threshold, the touch recognition mode is switched to an electromagnetic touch mode, in which the duration of the capacitive touch sub-period in each frame display period of the display device is 0; When the refresh frequency is not greater than the preset frequency threshold, the step of responding to the handwritten pen touch control instruction according to the touch operation is performed.

10. A display device, characterized in that: The display device is configured to execute the touch control method according to any one of claims 4 to 9.

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