WO2019242018A1 - 手写感应装置及其低功耗控制电路、方法 - Google Patents

手写感应装置及其低功耗控制电路、方法 Download PDF

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Publication number
WO2019242018A1
WO2019242018A1 PCT/CN2018/092480 CN2018092480W WO2019242018A1 WO 2019242018 A1 WO2019242018 A1 WO 2019242018A1 CN 2018092480 W CN2018092480 W CN 2018092480W WO 2019242018 A1 WO2019242018 A1 WO 2019242018A1
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Prior art keywords
touch controller
pressure
detection circuit
signal
power consumption
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PCT/CN2018/092480
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English (en)
French (fr)
Inventor
曾露
Original Assignee
深圳市柔宇科技有限公司
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Application filed by 深圳市柔宇科技有限公司 filed Critical 深圳市柔宇科技有限公司
Priority to CN201880093813.6A priority Critical patent/CN112470106A/zh
Priority to PCT/CN2018/092480 priority patent/WO2019242018A1/zh
Publication of WO2019242018A1 publication Critical patent/WO2019242018A1/zh

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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

Definitions

  • the present application relates to the technical field of control circuits, and in particular, to a handwriting sensing device and a low power consumption control circuit and method thereof.
  • the touch controller of the handwriting sensing device needs to be continuously in a working state and continuously scan the touch surface in order to respond to the touch operation of the active pen at any time.
  • continuous scanning of the touch surface tends to cause problems such as large overall power consumption and low endurance of the system. Such problems are more obvious in touch systems with multiple touch surfaces.
  • the application provides a handwriting sensing device and a low power consumption control circuit and method thereof, which can allow the touch controller to enter a sleep state when no handwriting operation has been received for a long time, so as to reduce system power consumption and extend system battery life.
  • the touch controller is awakened in time before the touch operation is about to occur, so as to respond to the touch operation in a timely manner, and effectively avoid the occurrence of strokes.
  • the present application provides a low power consumption control circuit, which is applied to a handwriting sensing device.
  • the low-power-consumption control circuit includes a detection circuit, a switch, a metal shield layer, and a control unit, and the metal shield layer is configured to be electrically connected to one of the detection circuit and a ground terminal through the switch. , Wherein the metal shielding layer is electrically connected to the detection circuit when a touch controller of the handwriting sensing device is in a sleep state;
  • the control unit is electrically connected to the detection circuit, the switch, and the touch controller, respectively, and the detection circuit is configured to detect the handwriting induction through the metal shielding layer when it is electrically connected to the metal shielding layer.
  • the control unit is configured to control the touch controller to resume the working state when the touch controller is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit, and control the switch
  • the metal shielding layer is electrically connected to the ground terminal.
  • the present application provides a handwriting sensing device including the low-power consumption control circuit described in the first aspect.
  • the present application provides a low power consumption control method, which is applied to a handwriting sensing device.
  • the handwriting sensing device includes a low-power consumption control circuit.
  • the low-power consumption control circuit includes a detection circuit, a switch, and a metal shield layer.
  • the metal shield layer is used to selectively communicate with the detection circuit through the switch. And is electrically connected to one of the ground terminals, wherein the metal shielding layer is electrically connected to the detection circuit when the touch controller of the handwriting sensing device is in a sleep state.
  • the low power consumption control method includes:
  • the detection circuit detects a first pressure-sensitive signal sent by a stylus of the handwriting sensing device through the metal shielding layer, wherein the first pressure-sensitive signal is A pressure-sensitive signal emitted when the stylus approaches but does not contact the writing surface of the handwriting sensing device;
  • the touch controller When the detection circuit detects the first pressure-sensitive signal, the touch controller is controlled to resume an operating state, and the switch is controlled to conduct electrical connection between the metal shield layer and the ground terminal.
  • the low-power-consumption control circuit and method of the present application use a grounded metal shielding layer of a handwriting sensing device as a detection electrode for detecting the proximity of the stylus, and can change the touch controller in time through a simple frequency detection circuit and a switch.
  • Working state of the touch controller thereby allowing the touch controller to enter a sleep state when no handwriting operation has been received for a long time to reduce system power consumption, extend system battery life, and be able to wake up the touch control in time before a touch operation is about to occur Device in order to respond to touch operations in a timely manner, effectively avoiding the occurrence of strokes.
  • FIG. 1 is a schematic diagram of a touch system according to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a low power consumption control circuit according to an embodiment of the present application.
  • FIG. 3 is a flowchart of a low power consumption control method according to an embodiment of the present application.
  • the touch system 100 may include a stylus 20 and a handwriting sensing device 30.
  • the handwriting sensing device 30 may be an electronic handwriting tablet, the stylus pen 20 has a touch pressure sensing function, and may establish a communication connection with the handwriting sensing device 30.
  • the stylus pen 20 may include a pen core, a pressure sensor, and a first communication module (not shown).
  • the pressure sensor is configured to sense a pen tip of the pen core when the stylus pen 20 is writing.
  • the touch pressure is received and a pressure-sensitive signal is generated.
  • the stylus pen 20 transmits the pressure-sensitive signal to the handwriting sensing device 30 through the first communication module.
  • the handwriting sensing device 30 senses the writing operation of the stylus pen 20 through the writing surface 301 and generates a corresponding Touch coordinate data, and generate a three-dimensional touch handwriting corresponding to the real handwriting according to the received pressure-sensitive signal and the generated touch coordinate data.
  • FIG. 2 is a schematic structural diagram of a low-power consumption control circuit 40 according to an embodiment of the present application.
  • the low-power consumption control circuit 40 can be applied to the handwriting sensing device 30 described above.
  • the handwriting sensing device 30 may include a touch sensing device 31, a touch controller 32 electrically connected to the touch sensing device 31, and a protective layer 33 covering a touch surface of the touch sensing device 31.
  • the protective layer 33 may be a transparent cover plate or a transparent protective film for protecting the touch sensing device 31.
  • the touch sensing device 31 may be a touch panel or a touch display screen.
  • the touch sensing device 31 senses the writing operation of the stylus pen 20 through the writing surface 301 and generates a corresponding touch. Control coordinate data.
  • the touch sensing device 31 may include a capacitive touch sensor for sensing a touch signal of the stylus 20 and forming a coupling capacitance with the stylus 20, The touch coordinate data is further generated according to the change in the coupling capacitance.
  • the touch controller 32 is configured to acquire the touch coordinate data.
  • the handwriting sensing device 30 may further include a second communication module (not shown), and the touch controller 32 may obtain the pressure sensitivity sent by the stylus pen 20 through the second communication module. signal.
  • the handwriting sensing device 30 further includes a control unit 35 electrically connected to the touch controller 32.
  • the touch controller 32 is further configured to combine the obtained pressure-sensitive signal with the touch
  • the coordinate data is transmitted to the control unit 35 to trigger the control unit 35 to generate a three-dimensional touch stroke corresponding to the real stroke.
  • the handwriting sensing device 30 further includes a metal shielding layer 34 disposed on a surface of the touch sensing device 31 away from the protective layer 33.
  • the metal shielding layer 34 may be a conductive metal such as aluminum foil or copper foil.
  • the metal shielding layer 34 is electrically connected to the ground terminal 50 to form a shielding layer for shielding interference signals from a desktop or the like to avoid or reduce the interference. These interference signals cause interference to signals sensed by the touch sensing device 31 and signals received by the touch controller 32.
  • the low power consumption control circuit 40 includes a detection circuit 41, a switch 42, the metal shielding layer 34, and the control unit 35.
  • the detection circuit 41 and the switch 42 are disposed on the handwriting sensing device 30.
  • the metal shielding layer 34 is used to selectively electrically connect to one of the detection circuit 41 and the ground terminal 50 through the changeover switch 42, that is, the changeover switch 42 is used for For selectively conducting the electrical connection between the metal shielding layer 34 and the detection circuit 41, or selectively conducting the electrical connection between the metal shielding layer 34 and the ground terminal 50.
  • the metal shielding layer 34 is electrically connected to the ground terminal 50 when the touch controller 32 is in the working state, that is, the metal shielding layer 34 is in a shielding mode, so that the handwriting sensing device 30 can be normally implemented. Touch-sensitive function.
  • the metal shielding layer 34 is electrically connected to the detection circuit 41 when the touch controller 32 is in a sleep state.
  • the control unit 35 is electrically connected to the detection circuit 41, the switch 42, and the touch controller 32, respectively.
  • the control unit 35 is configured to receive touch coordinate data uploaded by the touch controller 32 and a pressure-sensitive signal of a stylus pen when the touch controller 32 is in a working state, and according to the received touch coordinate data and The pressure-sensitive signal of the stylus generates a three-dimensional touch stroke corresponding to the real stroke to trigger a corresponding touch function or convert it into a corresponding input text, thereby realizing a touch recognition function.
  • the control unit 35 is further configured to control the touch controller 32 to enter a sleep state when the touch coordinate data uploaded by the touch controller 32 is not received within a preset time, and control the switch 42 to be turned on.
  • the metal shielding layer 34 is electrically connected to the detection circuit 41.
  • control unit 35 is configured to generate a sleep control signal and a first on signal when the touch coordinate data uploaded by the touch controller 32 in the working state is not received within a preset time, and set the A sleep control signal is sent to the touch controller 32 to control the touch controller 32 to enter a sleep state, and to control the switch 42 to turn on the metal shielding layer 34 and the The electrical connection of the detection circuit 41.
  • the touch sensing device 31 when the user has not used the stylus pen 20 for a long time, which causes the touch sensing device 31 not to sense the touch signal of the stylus pen 20 within a preset time, the touch sensing The device 31 does not generate touch coordinate data within a preset time. Therefore, the control unit 35 will not receive touch coordinate data uploaded by the touch controller 32 in a working state within a preset time. At this time, the control unit 35 controls the touch controller 32 to enter a sleep state, which can reduce system power consumption and extend system battery life.
  • the metal shielding layer 34 forms a detection electrode when it is electrically connected to the detection circuit 41, and the detection circuit 41 is configured to pass the metal shield when it is electrically connected to the metal shielding layer 34.
  • the layer 34 detects a first pressure-sensitive signal sent from the stylus 20 of the touch system 100 and reports the detected first pressure-sensitive signal to the control unit 35.
  • the first pressure-sensitive signal is a pressure-sensitive signal sent when the stylus pen 20 approaches but does not contact the writing surface 301 of the handwriting sensing device 30.
  • the stylus pen 20 with pressure sensitivity usually outputs pressure-sensitive signals with different frequencies corresponding to different touch pressures.
  • the stylus pen 20 When there is no touch pressure, that is, the stylus pen 20 is not in contact with the writing surface 301 of the handwriting sensing device 30, the stylus pen 20 will output a 0th order pressure-sensitive signal, that is, in this embodiment
  • the first pressure-sensitive signal is a zero-order pressure-sensitive signal.
  • the metal shielding layer 34 covers the entire touch area of the touch sensing device 31, the metal shielding layer 34 can be used as a large-area detection electrode to receive the 0th order pressure-sensitive signal, so as long as the stylus 20 Close to the touch area, the detection circuit 41 can detect the 0th order pressure-sensitive signal through the metal shielding layer 34 and report the detected 0th order pressure-sensitive signal to the control unit 35. .
  • the detection circuit 41 can detect a preset frequency or continuously detect the 0th order pressure-sensitive signal.
  • the detection circuit 41 detects the 0th-order pressure-sensitive signal at the same detection frequency as the frequency of the 0th-order pressure-sensitive signal.
  • the detection frequency of the detection circuit 41 is set to be the same as the frequency of the 0th-order pressure-sensitive signal, when the stylus 20 approaches the writing surface 301 of the handwriting sensing device 30 , It is possible to detect whether there is a 0th-order pressure-sensitive signal by using the same-frequency interference noise generated when the 0th-order pressure-sensitive signal sent by the stylus pen 20 approaches the metal shielding layer 34.
  • the detection circuit 41 may be further configured to perform amplification, frequency division, and other processing on the detected 0th-order pressure-sensitive signal, and then report it to the control unit 35.
  • the control unit 35 may be, for example, a microcontroller or a microprocessor.
  • the control unit 35 is further configured to control the touch controller 32 to resume the working state when the touch controller 32 is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit 41 to wake up
  • the touch sensing function of the handwriting sensing device 30 controls the switch 42 to conduct electrical connection between the metal shielding layer 34 and the ground terminal 50.
  • control unit 35 is configured to generate a wake-up control signal and a second on signal when the touch controller 32 is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit 41, and Sending the wake-up control signal to the touch controller 32 to control the touch controller 32 to resume working state, and controlling the switch 42 to turn on the metal shielding layer 34 according to the second conduction signal And electrical connection with the ground terminal 50.
  • the metal shielding layer 34 is restored to the shielding mode due to the electrical connection with the ground terminal 50, and the detection circuit 41 cannot pass through the metal.
  • the shielding layer 34 detects the 0th order pressure-sensitive signal. After the touch controller 32 resumes the working state, it can receive the pressure-sensitive signal, such as a pressure-sensitive signal of the order of 0 to 2048, sent by the stylus 20.
  • the detection circuit 41 and the metal shielding layer 34 used as the detection electrode can detect the 0th order pressure-sensitive signal from the stylus 20 in advance, so that the stylus 20 can be detected on the stylus 20.
  • the touch controller 32 is in a sleep state
  • the detection circuit 41 and the metal shielding layer 34 used as the detection electrode can detect the 0th order pressure-sensitive signal from the stylus 20 in advance, so that the stylus 20 can be detected on the stylus 20.
  • wake up the touch sensing function of the handwriting sensing device 30 in time so as to respond to the touch operation of the stylus pen 20 in time and effectively avoid the occurrence of strokes. .
  • the switch 42 includes a first connection terminal 421, a second connection terminal 422, and a third connection terminal 423.
  • the first connection terminal 421 is electrically connected to the metal shielding layer 34.
  • the second connection terminal 422 is electrically connected to the detection circuit 41, and the third connection terminal 423 is electrically connected to the ground terminal 50.
  • the control unit 35 may control the first connection terminal 421 of the switch 42 to be electrically connected to the second connection terminal 422 or the third connection terminal 423, and at the same time, the first connection terminal of the switch 42 421 can only choose to connect one of the second connection terminal 422 and the third connection terminal 423, so that the electrical connection between the metal shielding layer 34 and the detection circuit 41 can be conducted through the switch 42, or an electrical connection can be conducted.
  • the metal shielding layer 34 is electrically connected to the ground terminal 50.
  • the switch 42 further includes a control terminal 424, and the control unit 35 is electrically connected to the control terminal 424, and the first connection terminal 421 and the second connection terminal 422 of the switch 42 are connected through the control terminal 424. And the electrical connection state between the third connection terminal 423 and the control.
  • the switch 42 may be a single-pole double-throw electronic switch.
  • the switch 42 may further include a conductive arm 425. One end of the conductive arm 425 is electrically connected to the first connection end 421, and the other end is connected to the second connection end 422 through the control unit 35. One of the three connection terminals 423 is electrically connected.
  • the switch 42 may also include a first switch tube and a second switch tube, and the first switch tube is electrically connected to the metal shielding layer 34 and the detection circuit. Between 41, the second switching tube is electrically connected between the metal shielding layer 34 and the ground terminal 50, and the conducting states of the first switching tube and the second switching tube at the same time are opposite, that is, When one of the switches is turned on, the other switch is turned off.
  • the low power consumption control circuit 40 of the present application multiplexes the ground metal shielding layer 34 of the handwriting sensing device 30 as a detection electrode for detecting whether the stylus 20 is approaching, and by adding a simple frequency detection circuit 41 and a switch 42, the working state of the touch controller 32 can be changed in time, thereby allowing the touch controller 32 to enter the sleep state when no handwriting operation has been received for a long time, in order to reduce system power consumption, extend system battery life, and enable touch operation
  • the touch controller 32 is awakened in time before it occurs, so as to respond to the touch operation in a timely manner and effectively avoid the occurrence of strokes.
  • FIG. 3 is a flowchart of a low power consumption control method according to an embodiment of the present application.
  • the method can be applied to the handwriting sensing device 30 according to the embodiment shown in FIG. 1-2.
  • the low power consumption control method includes the following steps:
  • Step 310 Receive touch coordinate data uploaded by the touch controller 32 when the touch controller 32 is in a working state.
  • Step 320 when the touch coordinate data uploaded by the touch controller 32 in the working state is not received within a preset time, control the touch controller 32 to enter a sleep state, and control the switch 42 to be turned on
  • the metal shielding layer 34 is electrically connected to the detection circuit 41.
  • the step 320 may include:
  • step 330 the detection circuit 41 detects the first pressure-sensitive signal sent by the stylus 20 of the touch system 100 through the metal shielding layer 34.
  • the first pressure-sensitive signal is a pressure-sensitive signal sent when the stylus pen 20 approaches but does not contact the writing surface 301 of the handwriting sensing device 30.
  • the stylus 20 with pressure sensitivity usually outputs pressure-sensing signals of different frequencies corresponding to different touch pressures, when there is no touch pressure, the stylus 20 does not contact the handwriting sensing device 30
  • the stylus pen 20 outputs a 0-order pressure-sensitive signal, that is, in this embodiment, the first pressure-sensitive signal is a 0-order pressure-sensitive signal.
  • the step 330 may include: the detection circuit 41 detects the first pressure-sensitive signal at a detection frequency that is the same as the frequency of the first pressure-sensitive signal.
  • Step 340 When the detection circuit 41 detects the first pressure-sensitive signal, control the touch controller 32 to resume working state, and control the switch 42 to turn on the metal shielding layer 34 and the ground. Electrical connection of terminal 50. The flow returns to step 310, and steps 310-340 are executed cyclically.
  • the step 340 may include:
  • the low power consumption control method of the present application can reuse the ground metal shielding layer of the handwriting sensing device as a detection electrode to detect whether the stylus is approaching, and can change the touch control in time through a simple frequency detection circuit and a switch.
  • Working state of the device thereby allowing the touch controller to enter a sleep state when no handwriting operation has been received for a long time to reduce system power consumption, extend system battery life, and be able to wake up the touch in time before a touch operation is about to occur
  • the controller in order to respond to the touch operation in a timely manner, and effectively avoid the occurrence of strokes.

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  • Theoretical Computer Science (AREA)
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Abstract

本申请提供一种手写感应装置及其低功耗控制电路、方法，所述低功耗控制电路包括检测电路、切换开关、金属屏蔽层以及控制单元，金属屏蔽层通过切换开关选择性地与检测电路和接地端中的其中一个电连接。检测电路在与所述金属屏蔽层电连接时，通过所述金属屏蔽层检测所述手写感应装置的触控笔发出的第一压感信号，并将检测到的所述第一压感信号上报给所述控制单元，所述第一压感信号为所述触控笔靠近而未接触到所述手写感应装置的书写面时发出的压感信号。所述控制单元用于在所述触摸控制器处于休眠状态且接收到所述检测电路上报的所述第一压感信号时，控制所述触摸控制器恢复工作状态，并控制所述切换开关导通所述金属屏蔽层与所述接地端的电连接。

Description

手写感应装置及其低功耗控制电路、方法 技术领域
本申请涉及控制电路技术领域，尤其涉及一种手写感应装置及其低功耗控制电路、方法。
背景技术
现有主动笔触控***，为了实现不掉笔画即时响应，手写感应装置的触摸控制器需要持续处于工作状态并持续扫描触控面，以便随时响应主动笔的触控操作。然而，触控面的持续扫描容易导致***整体功耗大、续航能力低等问题，此类问题在具有多个触控面的触控***中更为明显。
发明内容
本申请提供一种手写感应装置及其低功耗控制电路、方法，可允许触摸控制器在长时间未接收到手写操作时进入休眠状态，以降低***功耗，延长***续航时间，并能够在触控操作将要发生之前及时地唤醒所述触摸控制器，以便及时地响应触控操作，有效地避免掉笔画的情况发生。
第一方面，本申请提供一种低功耗控制电路，应用于手写感应装置中。所述低功耗控制电路包括检测电路、切换开关、金属屏蔽层以及控制单元，所述金属屏蔽层用于通过所述切换开关选择性地与所述检测电路和接地端中的其中一个电连接，其中，所述金属屏蔽层在所述手写感应装置的触摸控制器处于休眠状态时与所述检测电路电连接；
所述控制单元与所述检测电路、切换开关以及所述触摸控制器分别电连接，所述检测电路用于在与所述金属屏蔽层电连接时，通过所述金属屏蔽层检测所述手写感应装置的触控笔发出的第一压感信号，并将检测到的所述第一压感信号上报给所述控制单元，其中，所述第一压感信号为所述触控笔靠近而未接触到所述手写感应装置的书写面时发出的压感信号；
所述控制单元用于在所述触摸控制器处于休眠状态且接收到所述检测电路上报的所述第一压感信号时，控制所述触摸控制器恢复工作状态，并控制所述切 换开关导通所述金属屏蔽层与所述接地端的电连接。
第二方面，本申请提供一种手写感应装置，包括上述第一方面所述的低功耗控制电路。
第三方面，本申请提供一种低功耗控制方法，应用于手写感应装置中。所述手写感应装置包括低功耗控制电路，所述低功耗控制电路包括检测电路、切换开关以及金属屏蔽层，所述金属屏蔽层用于通过所述切换开关选择性地与所述检测电路和接地端中的其中一个电连接，其中，所述金属屏蔽层在所述手写感应装置的触摸控制器处于休眠状态时与所述检测电路电连接。所述低功耗控制方法包括：
在所述触摸控制器处于休眠状态时，所述检测电路通过所述金属屏蔽层检测所述手写感应装置的触控笔发出的第一压感信号，其中，所述第一压感信号为所述触控笔靠近而未接触到所述手写感应装置的书写面时发出的压感信号；以及
当所述检测电路检测到所述第一压感信号时，控制所述触摸控制器恢复工作状态，并控制所述切换开关导通所述金属屏蔽层与所述接地端的电连接。
本申请的低功耗控制电路及方法通过复用手写感应装置的接地金属屏蔽层为检测所述触控笔接近的检测电极，并通过简单的频率检测电路及切换开关，可及时改变触摸控制器的工作状态，从而可允许触摸控制器在长时间未接收到手写操作时进入休眠状态，以降低***功耗，延长***续航时间，并能够在触控操作将要发生之前及时地唤醒所述触摸控制器，以便及时地响应触控操作，有效地避免掉笔画的情况发生。
附图说明
为了更清楚地说明本申请实施方式或现有技术中的技术方案，下面将对实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请一实施方式提供的触控***的示意图。
图2为本申请一实施方式提供的低功耗控制电路的结构示意图。
图3为本申请一实施方式提供的低功耗控制方法的流程图。
具体实施方式
下面将结合本申请实施方式中的附图，对本申请实施方式中的技术方案进行清楚、完整地描述，显然，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。
请参阅图1，为本申请一实施方式提供的触控***100的示意图。所述触控***100可包括触控笔20以及手写感应装置30。其中，所述手写感应装置30可为电子手写板，所述触控笔20具备触控压力感测功能，并可与所述手写感应装置30建立通信连接。具体地，所述触控笔20可包括笔芯、压力传感器以及第一通信模块(图未示)，所述压力传感器用于在所述触控笔20书写时感测所述笔芯的笔尖受到的触控压力并生成压感信号。所述触控笔20通过所述第一通信模块将所述压感信号传输给所述手写感应装置30。
当所述触控笔20在所述手写感应装置30的书写面301上进行书写时，所述手写感应装置30通过所述书写面301感测所述触控笔20的书写操作并生成相应的触控坐标数据，并根据接收到的所述压感信号以及生成的触控坐标数据生成与真实笔迹对应的三维触控笔迹。
请参阅图2，为本申请一实施方式提供的低功耗控制电路40的结构示意图，所述低功耗控制电路40可应用于上述的手写感应装置30中。如图2所示，所述手写感应装置30可包括触摸感应器件31、与所述触摸感应器件31电连接的触摸控制器32以及覆盖于所述触摸感应器件31的触摸面上的保护层33，所述保护层33例如可采用透明盖板或透明保护膜，用于对所述触摸感应器件31进行保护。
所述触摸感应器件31可为触摸板或触摸显示屏。所述触控笔20在所述触摸感应器件31的书写面301上进行书写时，所述触摸感应器件31通过所述书写面301感测所述触控笔20的书写操作并生成相应的触控坐标数据。
在一种实施方式中，所述触摸感应器件31可包括电容式触控传感器，用于感测所述触控笔20的触控信号，并与所述触控笔20之间形成耦合电容，进而根据所述耦合电容的变化生成所述触控坐标数据。
所述触摸控制器32用于获取所述触控坐标数据。在本实施方式中，所述手写感应装置30还可包括第二通信模块(图未示)，所述触摸控制器32可通过所述第二通信模块获取所述触控笔20发送的压感信号。
在本实施方式中，所述手写感应装置30还包括与所述触摸控制器32电连接的控制单元35，所述触摸控制器32还用于将获取的所述压感信号与所述触控坐标数据传输给所述控制单元35，以触发所述控制单元35生成与真实笔迹对应的三维触控笔迹。
为了适用于不同的写字桌面，所述手写感应装置30还包括设置于所述触摸感应器件31远离所述保护层33的表面上的金属屏蔽层34。其中，所述金属屏蔽层34可采用铝箔或铜箔等导电金属，所述金属屏蔽层34与接地端50电连接以形成屏蔽层，用于屏蔽来自桌面等的干扰信号，以避免或减少该些干扰信号对所述触摸感应器件31感测的信号以及所述触摸控制器32接收的信号造成干扰。
在本实施方式中，所述低功耗控制电路40包括检测电路41、切换开关42、所述金属屏蔽层34以及所述控制单元35。其中，所述检测电路41以及切换开关42设置于所述手写感应装置30上。
在本实施方式中，所述金属屏蔽层34用于通过所述切换开关42选择性地与所述检测电路41和所述接地端50中的其中一个电连接，即，所述切换开关42用于选择性地导通所述金属屏蔽层34与所述检测电路41的电连接，或者选择性地导通所述金属屏蔽层34与所述接地端50的电连接。
其中，所述金属屏蔽层34在所述触摸控制器32处于工作状态时与所述接地端50电连接，即所述金属屏蔽层34处于屏蔽模式，使所述手写感应装置30能够正常地实现触摸感应功能。所述金属屏蔽层34在所述触摸控制器32处于休眠状态时与所述检测电路41电连接。
所述控制单元35与所述检测电路41、切换开关42以及所述触摸控制器32分别电连接。所述控制单元35用于在所述触摸控制器32处于工作状态时接收所述触摸控制器32上传的触控坐标数据以及触控笔的压感信号，并根据接收到的触控坐标数据以及触控笔的压感信号生成与真实笔迹对应的三维触控笔迹，以触发相应的触控功能或者转化为相应的输入文本，从而实现触摸识别功能。
所述控制单元35还用于在预设时间内未接收到所述触摸控制器32上传的触 控坐标数据时，控制所述触摸控制器32进入休眠状态，并控制所述切换开关42导通所述金属屏蔽层34与所述检测电路41的电连接。
具体地，所述控制单元35用于在预设时间内未接收到处于工作状态的所述触摸控制器32上传的触控坐标数据时生成休眠控制信号和第一导通信号，并将所述休眠控制信号发送给所述触摸控制器32，以控制所述触摸控制器32进入休眠状态，以及根据所述第一导通信号控制所述切换开关42导通所述金属屏蔽层34与所述检测电路41的电连接。
可以理解的是，当用户长时间未使用所述触控笔20，导致所述触摸感应器件31在预设时间内未感测到所述触控笔20的触控信号时，所述触摸感应器件31在预设时间内都不会生成触控坐标数据。因此，所述控制单元35在预设时间内也不会接收到处于工作状态的所述触摸控制器32上传的触控坐标数据。这时，控制单元35控制所述触摸控制器32进入休眠状态，可降低***功耗，并延长***续航时间。
在本实施方式中，所述金属屏蔽层34在与所述检测电路41电连接时形成检测电极，所述检测电路41用于在与所述金属屏蔽层34电连接时，通过所述金属屏蔽层34检测所述触控***100的触控笔20发出的第一压感信号，并将检测到的所述第一压感信号上报给所述控制单元35。其中，所述第一压感信号为所述触控笔20靠近而未接触到所述手写感应装置30的书写面301时发出的压感信号。
带压感的所述触控笔20对应于不同的触控压力通常会输出不同频率的压感信号。在无触控压力，即所述触控笔20未接触到所述手写感应装置30的书写面301时，所述触控笔20会输出0阶压感信号，也就是说，在本实施方式中，所述第一压感信号为0阶压感信号。
由于所述金属屏蔽层34覆盖所述触摸感应器件31的整个触控区域，所述金属屏蔽层34可作为一个大面积的检测电极来接收所述0阶压感信号，因此只要触控笔20靠近所述触控区域，所述检测电路41就能通过所述金属屏蔽层34检测到所述0阶压感信号，并将检测到的所述0阶压感信号上报给所述控制单元35。
其中，所述检测电路41可以预设频率检测或持续地检测所述0阶压感信号。
在本实施方式中，为了更好地检测所述0阶压感信号，所述检测电路41以与所述0阶压感信号的频率相同的检测频率检测所述0阶压感信号。
可以理解的是，通过将所述检测电路41的检测频率设定为与所述0阶压感信号的频率相同，从而在所述触控笔20靠近所述手写感应装置30的书写面301时，可利用所述触控笔20发出的0阶压感信号靠近所述金属屏蔽层34时产生的同频干扰噪声来检测是否有0阶压感信号。
在本实施方式中，所述检测电路41还可用于对检测到的所述0阶压感信号进行放大、分频等处理之后，再上报给所述控制单元35。
所述控制单元35例如可采用单片机或微处理器。所述控制单元35还用于在所述触摸控制器32处于休眠状态且接收到所述检测电路41上报的所述第一压感信号时，控制所述触摸控制器32恢复工作状态，以唤醒所述手写感应装置30的触摸感应功能，并控制所述切换开关42导通所述金属屏蔽层34与所述接地端50的电连接。
具体地，所述控制单元35用于在所述触摸控制器32处于休眠状态且接收到所述检测电路41上报的所述第一压感信号时生成唤醒控制信号和第二导通信号，并将所述唤醒控制信号发送给所述触摸控制器32，以控制所述触摸控制器32恢复工作状态，以及根据所述第二导通信号控制所述切换开关42导通所述金属屏蔽层34与所述接地端50的电连接。
可以理解的是，在所述触摸控制器32恢复工作状态后，所述金属屏蔽层34由于与所述接地端50电连接而恢复到屏蔽模式，所述检测电路41也就无法通过所述金属屏蔽层34检测所述0阶压感信号。所述触摸控制器32在恢复工作状态后可接收所述触控笔20发出的压感信号，例如0～2048阶压感信号。
可见，采利用本申请实施例提供的所述低功耗控制电路40，在所述触摸控制器32处于休眠状态下，当所述触控笔20靠近但未接触到所述手写感应装置30的书写面301时，可通过所述检测电路41以及作为检测电极使用的所述金属屏蔽层34提前检测到所述触控笔20发出的0阶压感信号，从而可在所述触控笔20接触到所述手写感应装置30的书写面301之前及时地唤醒所述手写感应装置30的触摸感应功能，以便及时地响应所述触控笔20的触控操作，有效地避免掉笔画的情况发生。
在一种实施方式中，所述切换开关42包括第一连接端421、第二连接端422、以及第三连接端423，其中，所述第一连接端421与所述金属屏蔽层34电连接，所述第二连接端422与所述检测电路41电连接，所述第三连接端423与所述接地端50电连接。所述控制单元35可以控制所述切换开关42的第一连接端421与所述第二连接端422或第三连接端423电连接，且在同一时刻，所述切换开关42的第一连接端421只能选择连接第二连接端422与第三连接端423中的一个，从而可通过所述切换开关42导通所述金属屏蔽层34与所述检测电路41的电连接，或者导通所述金属屏蔽层34与所述接地端50的电连接。
所述切换开关42还包括控制端424，所述控制单元35与所述控制端424电连接，并通过所述控制端424对所述切换开关42的第一连接端421、第二连接端422、以及第三连接端423之间的电连接状态进行控制。
在一些实施方式中，所述切换开关42可采用单刀双掷电子开关。所述切换开关42还可包括导电臂425，所述导电臂425的一端与所述第一连接端421电连接，另一端在所述控制单元35的控制下与所述第二连接端422第三连接端423中的其中一个电连接。
可选地，在另一种实施方式中，所述切换开关42也可以包括第一开关管和第二开关管，所述第一开关管电连接于所述金属屏蔽层34与所述检测电路41之间，所述第二开关管电连接于所述金属屏蔽层34与所述接地端50之间，且所述第一开关管和第二开关管在同一时刻的导通状态相反，即，当其中一个开关管导通时，另一个开关管断开。
本申请的低功耗控制电路40通过复用所述手写感应装置30的接地金属屏蔽层34为检测所述触控笔20是否接近的检测电极，并通过增加简单的频率检测电路41及切换开关42，可及时改变触摸控制器32的工作状态，从而可允许触摸控制器32在长时间未接收到手写操作时进入休眠状态，以降低***功耗，延长***续航时间，并能够在触控操作将要发生之前及时地唤醒所述触摸控制器32，以便及时地响应触控操作，有效地避免掉笔画的情况发生。
请参阅图3，为本申请一实施方式提供的低功耗控制方法的流程图。所述方法可应用于上述图1-2所示实施方式的手写感应装置30中，如图3所示，所述低功耗控制方法包括如下步骤：
步骤310，在所述触摸控制器32处于工作状态时，接收所述触摸控制器32上传的触控坐标数据。
步骤320，当在预设时间内未接收到处于工作状态的所述触摸控制器32上传的触控坐标数据时，控制所述触摸控制器32进入休眠状态，并控制所述切换开关42导通所述金属屏蔽层34与所述检测电路41的电连接。
具体地，所述步骤320可包括：
当在预设时间内未接收到处于工作状态的所述触摸控制器32上传的触控坐标数据时，生成休眠控制信号和第一导通信号；以及
将所述休眠控制信号发送给所述触摸控制器32，以控制所述触摸控制器32进入休眠状态，以及根据所述第一导通信号控制所述切换开关42导通所述金属屏蔽层34与所述检测电路41的电连接。
步骤330，所述检测电路41通过所述金属屏蔽层34检测所述触控***100的触控笔20发出的第一压感信号。
其中，所述第一压感信号为所述触控笔20靠近而未接触到所述手写感应装置30的书写面301时发出的压感信号。
由于带压感的所述触控笔20对应于不同的触控压力通常会输出不同频率的压感信号，在无触控压力，即所述触控笔20未接触到所述手写感应装置30的书写面301时，所述触控笔20会输出0阶压感信号，也就是说，在本实施方式中，所述第一压感信号为0阶压感信号。
可选地，在一些实施方式中，所述步骤330可包括：所述检测电路41以与所述第一压感信号的频率相同的检测频率检测所述第一压感信号。
步骤340，当所述检测电路41检测到所述第一压感信号时，控制所述触摸控制器32恢复工作状态，并控制所述切换开关42导通所述金属屏蔽层34与所述接地端50的电连接。流程返回至步骤310，并循环执行步骤310-340。
具体地，所述步骤340可包括：
当检测到所述第一压感信号时，生成唤醒控制信号和第二导通信号；以及
将所述唤醒控制信号发送给所述触摸控制器32，以控制所述触摸控制器32恢复工作状态，以及根据所述第二导通信号控制所述切换开关42导通所述金属屏蔽层34与所述接地端50的电连接。
本申请的低功耗控制方法通过复用所述手写感应装置的接地金属屏蔽层为检测所述触控笔是否接近的检测电极，并通过简单的频率检测电路及切换开关，可及时改变触摸控制器的工作状态，从而可允许触摸控制器在长时间未接收到手写操作时进入休眠状态，以降低***功耗，延长***续航时间，并能够在触控操作将要发生之前及时地唤醒所述触摸控制器，以便及时地响应触控操作，有效地避免掉笔画的情况发生。
最后应说明的是，以上实施方式仅用以说明本申请的技术方案而非限制，尽管参照以上较佳实施方式对本申请进行了详细说明，本领域的普通技术人员应当理解，可以对本申请的技术方案进行修改或等同替换都不应脱离本申请技术方案的精神和范围。

Claims (19)

  1. 一种低功耗控制电路，应用于手写感应装置中，其特征在于，所述低功耗控制电路包括检测电路、切换开关、金属屏蔽层以及控制单元，所述金属屏蔽层用于通过所述切换开关选择性地与所述检测电路和接地端中的其中一个电连接，其中，所述金属屏蔽层在所述手写感应装置的触摸控制器处于休眠状态时与所述检测电路电连接；
    所述控制单元与所述检测电路、切换开关以及所述触摸控制器分别电连接，所述检测电路用于在与所述金属屏蔽层电连接时，通过所述金属屏蔽层检测所述手写感应装置的触控笔发出的第一压感信号，并将检测到的所述第一压感信号上报给所述控制单元，其中，所述第一压感信号为所述触控笔靠近而未接触到所述手写感应装置的书写面时发出的压感信号；
    所述控制单元用于在所述触摸控制器处于休眠状态且接收到所述检测电路上报的所述第一压感信号时，控制所述触摸控制器恢复工作状态，并控制所述切换开关导通所述金属屏蔽层与所述接地端的电连接。
  2. 如权利要求1所述的低功耗控制电路，其特征在于，所述控制单元还用于在所述触摸控制器处于工作状态时接收所述触摸控制器上传的触控坐标数据；以及在预设时间内未接收到处于工作状态的所述触摸控制器上传的触控坐标数据时，控制所述触摸控制器进入休眠状态，并控制所述切换开关导通所述金属屏蔽层与所述检测电路的电连接。
  3. 如权利要求2所述的低功耗控制电路，其特征在于，所述控制单元用于在预设时间内未接收到处于工作状态的所述触摸控制器上传的触控坐标数据时生成休眠控制信号，并将所述休眠控制信号发送给所述触摸控制器，以控制所述触摸控制器进入休眠状态。
  4. 如权利要求2所述的低功耗控制电路，其特征在于，所述控制单元用于在预设时间内未接收到处于工作状态的所述触摸控制器上传的触控坐标数据时生成第一导通信号，并根据所述第一导通信号控制所述切换开关导通所述金属屏蔽层与所述检测电路的电连接。
  5. 如权利要求1所述的低功耗控制电路，其特征在于，所述控制单元用于在 所述触摸控制器处于休眠状态且接收到所述检测电路上报的所述第一压感信号时生成唤醒控制信号，并将所述唤醒控制信号发送给所述触摸控制器，以控制所述触摸控制器恢复工作状态。
  6. 如权利要求1所述的低功耗控制电路，其特征在于，所述控制单元用于在所述触摸控制器处于休眠状态且接收到所述检测电路上报的所述第一压感信号时生成第二导通信号，并根据所述第二导通信号控制所述切换开关导通所述金属屏蔽层与所述接地端的电连接。
  7. 如权利要求1、5或6所述的低功耗控制电路，其特征在于，所述第一压感信号为0阶压感信号。
  8. 如权利要求7所述的低功耗控制电路，其特征在于，所述检测电路用于以与所述第一压感信号的频率相同的检测频率检测所述第一压感信号。
  9. 如权利要求1所述的低功耗控制电路，其特征在于，所述切换开关包括第一连接端、第二连接端、第三连接端以及控制端，所述第一连接端与所述金属屏蔽层电连接，所述第二连接端与所述检测电路电连接，所述第三连接端与所述接地端电连接，所述控制单元与所述控制端电连接，并通过所述控制端对所述切换开关的第一连接端、第二连接端、以及第三连接端之间的电连接状态进行控制。
  10. 如权利要求9所述的低功耗控制电路，其特征在于，所述切换开关还包括导电臂，所述导电臂的一端与所述第一连接端电连接，另一端在所述控制单元的控制下与所述第二连接端和第三连接端中的其中一个电连接。
  11. 一种手写感应装置，包括如权利要求1-10任意一项所述的低功耗控制电路。
  12. 一种低功耗控制方法，应用于手写感应装置中，其特征在于，所述手写感应装置包括低功耗控制电路，所述低功耗控制电路包括检测电路、切换开关以及金属屏蔽层，所述金属屏蔽层用于通过所述切换开关选择性地与所述检测电路和接地端中的其中一个电连接，其中，所述金属屏蔽层在所述手写感应装置的触摸控制器处于休眠状态时与所述检测电路电连接；所述低功耗控制方法包括：
    在所述触摸控制器处于休眠状态时，所述检测电路通过所述金属屏蔽层检测所述手写感应装置的触控笔发出的第一压感信号，其中，所述第一压感信号为所述触控笔靠近而未接触到所述手写感应装置的书写面时发出的压感信号；以及
    当所述检测电路检测到所述第一压感信号时，控制所述触摸控制器恢复工作状态，并控制所述切换开关导通所述金属屏蔽层与所述接地端的电连接。
  13. 如权利要求12所述的低功耗控制方法，其特征在于，所述低功耗控制方法还包括：
    在所述触摸控制器处于工作状态时，接收所述触摸控制器上传的触控坐标数据；以及
    当在预设时间内未接收到处于工作状态的所述触摸控制器上传的触控坐标数据时，控制所述触摸控制器进入休眠状态，并控制所述切换开关导通所述金属屏蔽层与所述检测电路的电连接。
  14. 如权利要求13所述的低功耗控制方法，其特征在于，所述低功耗控制方法包括：
    当在预设时间内未接收到处于工作状态的所述触摸控制器上传的触控坐标数据时，生成休眠控制信号，并将所述休眠控制信号发送给所述触摸控制器，以控制所述触摸控制器进入休眠状态。
  15. 如权利要求13所述的低功耗控制方法，其特征在于，所述低功耗控制方法包括：
    当在预设时间内未接收到处于工作状态的所述触摸控制器上传的触控坐标数据时，生成第一导通信号，并根据所述第一导通信号控制所述切换开关导通所述金属屏蔽层与所述检测电路的电连接。
  16. 如权利要求12所述的低功耗控制方法，其特征在于，所述低功耗控制方法包括：
    当检测到所述第一压感信号时，生成唤醒控制信号，并将所述唤醒控制信号发送给所述触摸控制器，以控制所述触摸控制器恢复工作状态。
  17. 如权利要求12所述的低功耗控制方法，其特征在于，所述低功耗控制方法包括：
    当检测到所述第一压感信号时，生成第二导通信号，并根据所述第二导通信号控制所述切换开关导通所述金属屏蔽层与所述接地端的电连接。
  18. 如权利要求12、16或17所述的低功耗控制方法，其特征在于，所述第一压感信号为0阶压感信号。
  19. 如权利要求18所述的低功耗控制方法，其特征在于，所述低功耗控制方法包括：
    所述检测电路以与所述第一压感信号的频率相同的检测频率检测所述第一压感信号。
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