CN112470106A - Handwriting induction device and low-power-consumption control circuit and method thereof - Google Patents
Handwriting induction device and low-power-consumption control circuit and method thereof Download PDFInfo
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- CN112470106A CN112470106A CN201880093813.6A CN201880093813A CN112470106A CN 112470106 A CN112470106 A CN 112470106A CN 201880093813 A CN201880093813 A CN 201880093813A CN 112470106 A CN112470106 A CN 112470106A
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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
Abstract
The application provides a handwriting induction device and a low-power-consumption control circuit and a method thereof, wherein the low-power-consumption control circuit comprises a detection circuit, a change-over switch, a metal shielding layer and a control unit, and the metal shielding layer is selectively and electrically connected with one of the detection circuit and a grounding end through the change-over switch. When the detection circuit is electrically connected with the metal shielding layer, a first pressure-sensitive signal sent by a stylus of the handwriting induction device is detected through the metal shielding layer, the detected first pressure-sensitive signal is reported to the control unit, and the first pressure-sensitive signal is a pressure-sensitive signal sent when the stylus is close to but not in contact with the writing surface of the handwriting induction device. The control unit is used for controlling the touch controller to recover the working state and controlling the change-over switch to conduct the electric connection between the metal shielding layer and the grounding end when the touch controller is in the dormant state and receives the first pressure-sensitive signal reported by the detection circuit.
Description
The application relates to the technical field of control circuits, in particular to a handwriting induction device and a low-power-consumption control circuit and method thereof.
In order to realize instant response without losing strokes, a touch controller of a handwriting sensing device needs to be continuously in a working state and continuously scan a touch surface so as to respond to touch operation of an active pen at any time. However, the continuous scanning of the touch surface easily causes the problems of large power consumption and low cruising ability of the system, which are more obvious in a touch system with a plurality of touch surfaces.
Disclosure of Invention
The application provides a handwriting induction device and a low-power consumption control circuit and method thereof, which can allow a touch controller to enter a dormant state when not receiving handwriting operation for a long time so as to reduce the power consumption of a system, prolong the endurance time of the system, and wake up the touch controller in time before the touch operation is about to occur so as to respond to the touch operation in time and effectively avoid the occurrence of strokes.
In a first aspect, the present application provides a low power consumption control circuit, which is applied to a handwriting sensing device. The low-power-consumption control circuit comprises a detection circuit, a change-over switch, a metal shielding layer and a control unit, wherein the metal shielding layer is used for being selectively and electrically connected with one of the detection circuit and a grounding end through the change-over switch, and the metal shielding layer is electrically connected with the detection circuit when a touch controller of the handwriting induction device is in a dormant state;
the control unit is electrically connected with the detection circuit, the change-over switch and the touch controller respectively, the detection circuit is used for detecting a first pressure-sensitive signal sent by a stylus of the handwriting induction device through the metal shielding layer when the detection circuit is electrically connected with the metal shielding layer, and reporting the detected first pressure-sensitive signal to the control unit, wherein the first pressure-sensitive signal is sent when the stylus is close to but not in contact with a writing surface of the handwriting induction device;
the control unit is used for controlling the touch controller to recover the working state and controlling the switch to conduct the electric connection between the metal shielding layer and the grounding end when the touch controller is in the dormant state and receives the first pressure-sensitive signal reported by the detection circuit.
In a second aspect, the present application provides a handwriting sensing apparatus, including the low power consumption control circuit of the first aspect.
In a third aspect, the present application provides a low power consumption control method, which is applied to a handwriting sensing apparatus. The handwriting induction device comprises a low-power-consumption control circuit, the low-power-consumption control circuit comprises a detection circuit, a change-over switch and a metal shielding layer, the metal shielding layer is used for being selectively electrically connected with one of the detection circuit and a grounding end through the change-over switch, and the metal shielding layer is electrically connected with the detection circuit when a touch controller of the handwriting induction device is in a dormant state. The low power consumption control method comprises the following steps:
when the touch controller is in a dormant state, the detection circuit detects a first pressure-sensitive signal sent by a stylus of the handwriting induction device through the metal shielding layer, wherein the first pressure-sensitive signal is sent when the stylus approaches and does not contact a writing surface of the handwriting induction device; and
when the detection circuit detects the first pressure-sensitive signal, the touch controller is controlled to restore the working state, and the change-over switch is controlled to conduct the electric connection between the metal shielding layer and the grounding end.
The low-power-consumption control circuit and the method can timely change the working state of the touch controller by multiplexing the grounding metal shielding layer of the handwriting induction device for detecting the detection electrode close to the touch pen, and can allow the touch controller to enter a dormant state when not receiving handwriting operation for a long time through a simple frequency detection circuit and a change-over switch, so that the power consumption of the system is reduced, the endurance time of the system is prolonged, the touch controller can be awakened in time before the touch operation is about to occur, the touch operation is timely responded, and the condition of strokes is effectively avoided.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a touch system according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a low power consumption control circuit according to an embodiment of the present disclosure.
Fig. 3 is a flowchart of a low power consumption control method according to an embodiment of the present application.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Please refer to fig. 1, which is a schematic diagram of a touch system 100 according to an embodiment of the present disclosure. The touch system 100 may include a stylus 20 and a handwriting sensing device 30. The handwriting sensing device 30 may be an electronic writing pad, and the stylus 20 has a touch pressure sensing function and can establish a communication connection with the handwriting sensing device 30. Specifically, the stylus pen 20 may include a pen core, a pressure sensor for sensing a touch pressure applied to a pen tip of the pen core when the stylus pen 20 writes and generating a pressure sensing signal, and a first communication module (not shown). The stylus pen 20 transmits the pressure sensing signal to the handwriting sensing device 30 through the first communication module.
When the stylus pen 20 writes on the writing surface 301 of the handwriting sensing device 30, the handwriting sensing device 30 senses the writing operation of the stylus pen 20 through the writing surface 301 and generates corresponding touch coordinate data, and generates a three-dimensional touch handwriting corresponding to a real handwriting according to the received pressure sensing signal and the generated touch coordinate data.
Referring to fig. 2, a schematic structural diagram of a low power consumption control circuit 40 according to an embodiment of the present application is shown, where the low power consumption control circuit 40 can be applied to the handwriting sensing device 30. As shown in fig. 2, the handwriting sensing apparatus 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, where the protective layer 33 may be, for example, a transparent cover or a transparent protective film for protecting the touch sensing device 31.
The touch sensing device 31 may be a touch pad or a touch display screen. When the stylus pen 20 writes on the writing surface 301 of the touch sensing device 31, the touch sensing device 31 senses the writing operation of the stylus pen 20 through the writing surface 301 and generates corresponding touch coordinate data.
In one embodiment, the touch sensing device 31 may include a capacitive touch sensor for sensing a touch signal of the stylus pen 20 and forming a coupling capacitance with the stylus pen 20, so as to generate the touch coordinate data according to a change of the coupling capacitance.
The touch controller 32 is configured to acquire the touch coordinate data. In this embodiment, the handwriting sensing apparatus 30 may further include a second communication module (not shown), and the touch controller 32 may obtain the pressure-sensing signal sent by the stylus pen 20 through the second communication module.
In this embodiment, the handwriting sensing device 30 further includes a control unit 35 electrically connected to the touch controller 32, and the touch controller 32 is further configured to transmit the obtained pressure sensing signal and the touch coordinate data to the control unit 35, so as to trigger the control unit 35 to generate a three-dimensional touch trace corresponding to a real trace.
In order to be suitable for different writing desks, the handwriting sensing device 30 further comprises a metal shielding layer 34 disposed on the surface of the touch sensing device 31 away from the protective layer 33. The metal shielding layer 34 may be made of conductive metal such as aluminum foil or copper foil, and 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, so as to avoid or reduce interference of the interference signals on signals sensed by the touch sensing device 31 and signals received by the touch controller 32.
In the present embodiment, 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.
In the present embodiment, the metal shielding layer 34 is configured to be selectively electrically connected to one of the detection circuit 41 and the ground 50 through the switch 42, that is, the switch 42 is configured to selectively conduct the electrical connection between the metal shielding layer 34 and the detection circuit 41, or the electrical connection between the metal shielding layer 34 and the ground 50.
When the touch controller 32 is in an operating state, the metal shielding layer 34 is electrically connected to the ground terminal 50, that is, the metal shielding layer 34 is in a shielding mode, so that the handwriting sensing apparatus 30 can normally implement a touch sensing 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 selector switch 42, and the touch controller 32, respectively. The control unit 35 is configured to receive touch coordinate data and a pressure sensing signal of a touch pen uploaded by the touch controller 32 when the touch controller 32 is in a working state, and generate a three-dimensional touch handwriting corresponding to a real handwriting according to the received touch coordinate data and the pressure sensing signal of the touch pen, so as to trigger a corresponding touch function or convert the touch function into a corresponding input text, thereby implementing 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 control coordinate data uploaded by the touch controller 32 is not received within a preset time, and control the switch 42 to connect the metal shielding layer 34 and the detection circuit 41 electrically.
Specifically, the control unit 35 is configured to generate a sleep control signal and a first conduction signal when the touch coordinate data uploaded by the touch controller 32 in the working state is not received within a preset time, and send the sleep control signal to the touch controller 32 to control the touch controller 32 to enter the sleep state, and control the switch 42 to conduct the electrical connection between the metal shielding layer 34 and the detection circuit 41 according to the first conduction signal.
It can be understood that, when the user does not use the stylus pen 20 for a long time, and the touch sensing device 31 does not sense the touch signal of the stylus pen 20 within a preset time, the touch sensing device 31 does not generate touch coordinate data within the preset time. Therefore, the control unit 35 does not receive the touch coordinate data uploaded by the touch controller 32 in the working state within a preset time. At this time, the control unit 35 controls the touch controller 32 to enter the sleep state, which can reduce the power consumption of the system and prolong the endurance time of the system.
In this embodiment, the metal shielding layer 34 forms a detection electrode when electrically connected to the detection circuit 41, and the detection circuit 41 is configured to detect a first pressure-sensitive signal emitted by the stylus 20 of the touch system 100 through the metal shielding layer 34 when electrically connected to the metal shielding layer 34, and report the detected first pressure-sensitive signal to the control unit 35. The first pressure-sensitive signal is a pressure-sensitive signal generated when the stylus 20 approaches and does not contact the writing surface 301 of the handwriting sensing device 30.
The stylus 20 with pressure sense usually outputs pressure sense signals with different frequencies corresponding to different touch pressures. 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 apparatus 30, the stylus pen 20 outputs a 0-level pressure-sensing signal, that is, in the present embodiment, the first pressure-sensing signal is a 0-level pressure-sensing signal.
Since 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 0-level pressure sensing signal, so as long as the stylus pen 20 is close to the touch area, the detection circuit 41 can detect the 0-level pressure sensing signal through the metal shielding layer 34 and report the detected 0-level pressure sensing signal to the control unit 35.
Wherein, the detection circuit 41 can detect the 0-step pressure-sensitive signal at a preset frequency or continuously.
In the present embodiment, in order to better detect the 0-order pressure-sensitive signal, the detection circuit 41 detects the 0-order pressure-sensitive signal at the same detection frequency as the frequency of the 0-order pressure-sensitive signal.
It can be understood that, by setting the detection frequency of the detection circuit 41 to be the same as the frequency of the 0 th order pressure-sensitive signal, when the stylus pen 20 approaches the writing surface 301 of the handwriting sensing device 30, the co-channel interference noise generated when the 0 th order pressure-sensitive signal emitted by the stylus pen 20 approaches the metal shielding layer 34 can be used to detect whether the 0 th order pressure-sensitive signal exists.
In this embodiment, the detection circuit 41 may be further configured to amplify, divide, and the like the detected 0-order pressure-sensitive signal, and then report the amplified signal to the control unit 35.
The control unit 35 may be, for example, a single chip microcomputer or a microprocessor. The control unit 35 is further configured to control the touch controller 32 to recover to a 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, so as to wake up the touch-sensitive function of the handwriting sensing apparatus 30, and control the switch 42 to connect the metal shielding layer 34 to the ground terminal 50.
Specifically, the control unit 35 is configured to generate a wake-up control signal and a second conduction 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 send the wake-up control signal to the touch controller 32, so as to control the touch controller 32 to restore the working state, and control the switch 42 to conduct the electrical connection between the metal shielding layer 34 and the ground terminal 50 according to the second conduction signal.
It can be understood that after the touch controller 32 returns to the operating state, the metal shielding layer 34 returns to the shielding mode due to the electrical connection with the ground terminal 50, and the detection circuit 41 cannot detect the 0-step pressure-sensitive signal through the metal shielding layer 34. The touch controller 32 can receive a pressure signal, such as a 0-2048-level pressure signal, sent by the stylus 20 after the working state is recovered.
It can be seen that, by using the low power consumption control circuit 40 provided in the embodiment of the present application, the touch controller 32 is in the sleep state, and when the stylus 20 is close to but not in contact with the writing surface 301 of the handwriting sensing device 30, the detection circuit 41 and the metal shielding layer 34 used as the detection electrode detect the 0-step pressure-sensitive signal sent by the stylus 20 in advance, so that the touch sensing function of the handwriting sensing device 30 can be timely awakened before the stylus 20 is in contact with the writing surface 301 of the handwriting sensing device 30, so as to timely respond to the touch operation of the stylus 20, thereby effectively avoiding the occurrence of the stroke condition.
In one embodiment, the switch 42 includes a first connection end 421, a second connection end 422, and a third connection end 423, wherein the first connection end 421 is electrically connected to the metal shielding layer 34, the second connection end 422 is electrically connected to the detection circuit 41, and the third connection end 423 is electrically connected to the ground 50. The control unit 35 can control the first connection end 421 of the switch 42 to be electrically connected to the second connection end 422 or the third connection end 423, and at the same time, the first connection end 421 of the switch 42 can only be selectively connected to one of the second connection end 422 and the third connection end 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 the electrical connection between the metal shielding layer 34 and the ground end 50 can be conducted.
The switch 42 further includes a control terminal 424, and the control unit 35 is electrically connected to the control terminal 424, and controls an electrical connection state among the first connection terminal 421, the second connection terminal 422, and the third connection terminal 423 of the switch 42 through the control terminal 424.
In some embodiments, the switch 42 may be a single pole double throw electronic switch. The switch 42 may further include a conductive arm 425, and one end of the conductive arm 425 is electrically connected to the first connection end 421, and the other end of the conductive arm 425 is electrically connected to one of the second connection end 422 and the third connection end 423 under the control of the control unit 35.
Optionally, in another embodiment, the switch 42 may also include a first switch tube and a second switch tube, the first switch tube is electrically connected between the metal shielding layer 34 and the detection circuit 41, the second switch tube is electrically connected between the metal shielding layer 34 and the ground terminal 50, and the conduction states of the first switch tube and the second switch tube at the same time are opposite, that is, when one of the switch tubes is turned on, the other switch tube is turned off.
The low-power consumption control circuit 40 of the application is through multiplexing the grounded metal shielding layer 34 of the handwriting induction device 30 is the detection electrode that detects whether the stylus 20 is close to, and through increasing simple frequency detection circuit 41 and change over switch 42, can change the operating condition of the touch controller 32 in time, thereby can allow the touch controller 32 to enter the dormant state when not receiving the handwriting operation for a long time, with the reduction of system power consumption, the extension of system duration, and can awaken the touch controller 32 in time before the touch operation will take place, so as to respond to the touch operation in time, avoid the condition of stroke to take place effectively.
Please refer to fig. 3, which is a flowchart illustrating a low power consumption control method according to an embodiment of the present disclosure. The method can be applied to the handwriting sensing device 30 of the embodiment shown in fig. 1-2, and as shown in fig. 3, the low power consumption control method includes the following steps:
In step 320, when the touch coordinate data uploaded by the touch controller 32 in the working state is not received within a preset time, the touch controller 32 is controlled to enter a sleep state, and the switch 42 is controlled to connect the metal shielding layer 34 to the detection circuit 41.
Specifically, the step 320 may include:
when the touch coordinate data uploaded by the touch controller 32 in the working state is not received within a preset time, generating a sleep control signal and a first conduction signal; and
sending the sleep control signal to the touch controller 32 to control the touch controller 32 to enter a sleep state, and controlling the switch 42 to electrically connect the metal shielding layer 34 and the detection circuit 41 according to the first conducting signal.
In step 330, the detection circuit 41 detects a first pressure-sensitive signal emitted 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 generated when the stylus 20 approaches and does not contact the writing surface 301 of the handwriting sensing device 30.
Since the stylus pen 20 with pressure generally outputs pressure-sensitive signals with different frequencies corresponding to different touch pressures, when there is no touch pressure, i.e. the stylus pen 20 is not in contact with the writing surface 301 of the handwriting sensing device 30, the stylus pen 20 outputs a 0-step pressure-sensitive signal, that is, in the present embodiment, the first pressure-sensitive signal is a 0-step pressure-sensitive signal.
Optionally, in some embodiments, 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.
Specifically, the step 340 may include:
when the first pressure-sensitive signal is detected, generating a wake-up control signal and a second conducting signal; and
sending the wake-up control signal to the touch controller 32 to control the touch controller 32 to recover to the working state, and controlling the switch 42 to connect the electrical connection between the metal shielding layer 34 and the ground terminal 50 according to the second connection signal.
The low-power-consumption control method is characterized in that the grounding metal shielding layer of the handwriting induction device is used for detecting whether the touch pen is close to the detection electrode, the working state of the touch controller can be changed in time through a simple frequency detection circuit and a change-over switch, and the touch controller can be allowed to enter a dormant state when the handwriting operation is not received for a long time, so that the power consumption of the system is reduced, the endurance time of the system is prolonged, and the touch controller can be awakened in time before the touch operation is about to occur, so that the touch operation is responded in time, and the occurrence of the stroke condition is effectively avoided.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (19)
- A low-power consumption control circuit is applied to a handwriting induction device and is characterized by comprising a detection circuit, a change-over switch, a metal shielding layer and a control unit, wherein the metal shielding layer is used for being selectively and electrically connected with one of the detection circuit and a grounding terminal through the change-over switch, and the metal shielding layer is electrically connected with the detection circuit when a touch controller of the handwriting induction device is in a dormant state;the control unit is electrically connected with the detection circuit, the change-over switch and the touch controller respectively, the detection circuit is used for detecting a first pressure-sensitive signal sent by a stylus of the handwriting induction device through the metal shielding layer when the detection circuit is electrically connected with the metal shielding layer, and reporting the detected first pressure-sensitive signal to the control unit, wherein the first pressure-sensitive signal is sent when the stylus is close to but not in contact with a writing surface of the handwriting induction device;the control unit is used for controlling the touch controller to recover the working state and controlling the change-over switch to conduct the electric connection between the metal shielding layer and the grounding end when the touch controller is in the dormant state and receives the first pressure-sensitive signal reported by the detection circuit.
- The low power consumption control circuit according to claim 1, wherein the control unit is further configured to receive touch coordinate data uploaded by the touch controller when the touch controller is in an operating state; and when the touch coordinate data uploaded by the touch controller in the working state is not received within the preset time, controlling the touch controller to enter a dormant state, and controlling the change-over switch to conduct the electric connection between the metal shielding layer and the detection circuit.
- The low power consumption control circuit according to claim 2, wherein the control unit is configured to generate a sleep control signal when touch coordinate data uploaded by the touch controller in the operating state is not received within a preset time, and send the sleep control signal to the touch controller to control the touch controller to enter the sleep state.
- The low power consumption control circuit according to claim 2, wherein the control unit is configured to generate a first conduction signal when touch coordinate data uploaded by the touch controller in the working state is not received within a preset time, and control the switch to conduct the electrical connection between the metal shielding layer and the detection circuit according to the first conduction signal.
- The low power consumption control circuit of claim 1, wherein the control unit is configured to generate a wake-up control signal when the touch controller is in a sleep state and receives the first pressure-sensitive signal reported by the detection circuit, and send the wake-up control signal to the touch controller to control the touch controller to resume the operating state.
- The low power consumption control circuit of claim 1, wherein the control unit is configured to generate a second conducting signal 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 to conduct the electrical connection between the metal shielding layer and the ground terminal according to the second conducting signal.
- The low power consumption control circuit according to claim 1, 5 or 6, wherein the first pressure sensing signal is a 0-step pressure sensing signal.
- The low power consumption control circuit of claim 7, wherein the detection circuit is to detect the first pressure sensing signal at a detection frequency that is the same as a frequency of the first pressure sensing signal.
- The low power consumption control circuit according to claim 1, wherein the switch includes a first connection terminal, a second connection terminal, a third connection terminal, and a control terminal, the first connection terminal is electrically connected to the metal shielding layer, the second connection terminal is electrically connected to the detection circuit, the third connection terminal is electrically connected to the ground terminal, and the control unit is electrically connected to the control terminal and controls an electrical connection state among the first connection terminal, the second connection terminal, and the third connection terminal of the switch through the control terminal.
- The low power consumption control circuit according to claim 9, wherein the switch further comprises a conductive arm, one end of the conductive arm is electrically connected to the first connection terminal, and the other end of the conductive arm is electrically connected to one of the second connection terminal and the third connection terminal under the control of the control unit.
- A handwriting sensing apparatus comprising a low power consumption control circuit according to any of claims 1-10.
- A low-power-consumption control method is applied to a handwriting induction device and is characterized in that the handwriting induction device comprises a low-power-consumption control circuit, the low-power-consumption control circuit comprises a detection circuit, a change-over switch and a metal shielding layer, the metal shielding layer is used for being selectively and electrically connected with one of the detection circuit and a grounding terminal through the change-over switch, and the metal shielding layer is electrically connected with the detection circuit when a touch controller of the handwriting induction device is in a dormant state; the low power consumption control method comprises the following steps:when the touch controller is in a dormant state, the detection circuit detects a first pressure-sensitive signal sent by a stylus of the handwriting induction device through the metal shielding layer, wherein the first pressure-sensitive signal is sent when the stylus approaches and does not contact a writing surface of the handwriting induction device; andwhen the detection circuit detects the first pressure-sensitive signal, the touch controller is controlled to restore the working state, and the change-over switch is controlled to conduct the electric connection between the metal shielding layer and the grounding end.
- The low power consumption control method according to claim 12, wherein the low power consumption control method further comprises:when the touch controller is in a working state, receiving touch coordinate data uploaded by the touch controller; andand when the touch coordinate data uploaded by the touch controller in the working state is not received within the preset time, controlling the touch controller to enter a dormant state, and controlling the change-over switch to conduct the electric connection between the metal shielding layer and the detection circuit.
- The low power consumption control method according to claim 13, wherein the low power consumption control method comprises:and when the touch coordinate data uploaded by the touch controller in the working state is not received within the preset time, generating a sleep control signal, and sending the sleep control signal to the touch controller so as to control the touch controller to enter the sleep state.
- The low power consumption control method according to claim 13, wherein the low power consumption control method comprises:when the touch coordinate data uploaded by the touch controller in the working state is not received within the preset time, a first conduction signal is generated, and the change-over switch is controlled to conduct the electric connection between the metal shielding layer and the detection circuit according to the first conduction signal.
- The low power consumption control method according to claim 12, wherein the low power consumption control method comprises:and when the first pressure sensing signal is detected, generating a wake-up control signal, and sending the wake-up control signal to the touch controller so as to control the touch controller to recover the working state.
- The low power consumption control method according to claim 12, wherein the low power consumption control method comprises:and when the first pressure-sensitive signal is detected, generating a second conduction signal, and controlling the change-over switch to conduct the electric connection between the metal shielding layer and the grounding end according to the second conduction signal.
- The low power consumption control method of claim 12, 16 or 17, wherein the first pressure-sensitive signal is a 0-step pressure-sensitive signal.
- The low power consumption control method according to claim 18, wherein the low power consumption control method comprises:the detection circuit detects the first pressure-sensitive signal at a detection frequency that is the same as a frequency of the first pressure-sensitive signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/092480 WO2019242018A1 (en) | 2018-06-22 | 2018-06-22 | Handwriting sensing apparatus and low power consumption control circuit and method therefor |
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| CN112470106A true CN112470106A (en) | 2021-03-09 |
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| CN201880093813.6A Pending CN112470106A (en) | 2018-06-22 | 2018-06-22 | Handwriting induction device and low-power-consumption control circuit and method thereof |
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| WO (1) | WO2019242018A1 (en) |
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