CN113346608B - Equipment with electronic ink screen and information protection method - Google Patents

Equipment with electronic ink screen and information protection method Download PDF

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Publication number
CN113346608B
CN113346608B CN202110625617.2A CN202110625617A CN113346608B CN 113346608 B CN113346608 B CN 113346608B CN 202110625617 A CN202110625617 A CN 202110625617A CN 113346608 B CN113346608 B CN 113346608B
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power supply
control signal
module
display module
switching
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CN113346608A (en
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卓彬彬
黄彩丽
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Universal Scientific Industrial Shanghai Co Ltd
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Universal Scientific Industrial Shanghai Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source

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  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Ink Jet (AREA)

Abstract

The invention discloses a device with an electronic ink screen and an information protection method, comprising the following steps: the device comprises a detection and identification module, a power supply control module and a display module; the detection and identification module is connected with the power supply control module and the display module and is used for detecting abnormal power-off signals of equipment and sending a first control signal to the power supply control module; the power supply control module is connected with the display module and is used for receiving the first control signal, controlling the charge and discharge states of the display module and switching the power supply channel of the display module into a first channel so as to enable the potential difference between the input end and the output end of the display module to be zero; the display module is used for brushing the display picture when the potential difference between the input end and the output end is zero. The invention judges whether the power is normally turned off or not by utilizing the CPU, and controls the VCOM voltage of the ink screen through the GPIO pin, so that the screen content can be cleared when the power is abnormally turned off, and the purpose of protecting the system configuration information from leakage is achieved.

Description

Equipment with electronic ink screen and information protection method
Technical Field
The invention relates to the field of electronic ink screens, in particular to equipment with an electronic ink screen and a method.
Background
Electrophoretic Electronic Ink (Electrophoretic Ink) technology is commonly referred to as Electronic Ink (Electronic Ink). Electronic ink is coated on a layer of plastic film, and then a Thin Film Transistor (TFT) circuit is attached, and pixel patterns are formed through control of a drive IC, so that an electronic paper display screen (Electronic Paper Displays, EPD) is created. Electronic ink screens have two advantages: power saving and eye protection. The electronic ink screen can continuously display pictures under the condition of no power supply, only a small amount of power supply is consumed when the pictures are changed, for example, a screen saver can be displayed under the shutdown state, and the screen can be refreshed only when the pages are turned. This feature will greatly reduce power consumption.
The electronic ink screen has the characteristic of saving the last display picture after power failure, and the shutdown picture can be displayed when the system is normally shutdown. If the system is abnormally powered down or abnormally shut down, the ink screen can display the final configuration information, and the information drain electrode is easy to cause.
Therefore, how to protect information under abnormal power failure or abnormal shutdown becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide equipment with an electronic ink screen and an information protection method, and the equipment solves the problems.
The technical scheme provided by the invention is as follows:
an apparatus having an electronic ink screen, comprising:
the device comprises a detection and identification module, a power supply control module and a display module;
the detection and identification module is connected with the power supply control module and the display module and is used for detecting abnormal power-off signals of equipment and sending a first control signal to the power supply control module;
the power supply control module is connected with the display module and is used for receiving the first control signal, controlling the charge and discharge states of the display module and switching the power supply channel of the display module into a first channel so as to enable the potential difference between the input end and the output end of the display module to be zero;
the display module is used for brushing the display picture when the potential difference between the input end and the output end is zero.
Further preferably:
the detection and identification module is further used for detecting whether an abnormal power-off signal exists or not when a shutdown command is received, determining that the equipment has an abnormal shutdown state when the abnormal power-off signal is detected, and sending a first control signal to the power supply control module.
Further preferably:
the detection and identification module is further used for sending a second control signal to the power supply control module when the normal working signal is detected;
the power supply control module is further configured to receive the second control signal, switch the charging state to the charging state, and switch the power supply channel of the display module to a second channel so that the display module works normally.
Further preferably:
the detection and identification module is used for sending a third control signal to the power control module and sending a shutdown picture to the display module when detecting the normal shutdown state of the equipment;
the power supply control module is used for receiving the third control signal, switching the charging state into the discharging state, and switching the power supply into the second channel so as to power down the display module;
the display module is used for receiving the shutdown picture and storing and displaying the shutdown picture after power failure.
Further preferably, the power control module includes:
the charge-discharge circuit is connected with the detection and identification module and is used for receiving the first control signal or the second control signal or the third control signal so as to control the charge-discharge state;
and the power supply switching circuit is connected with the charge-discharge circuit and the detection and identification module and is used for receiving the first control signal or the second control signal and switching a power supply channel.
Further preferably, the charge and discharge circuit includes:
a Boost sub-circuit for providing the preset voltage;
and the charge-discharge sub-circuit is connected with the Boost sub-circuit and the detection and identification module and is used for closing the charge-discharge state of the display module after receiving the first control signal.
Further preferably, the charge and discharge electronic circuit includes: the first switching tube, the second switching tube and the third switching tube;
the grid electrode of the first switching tube is connected with the detection and identification module, the drain electrode of the first switching tube is connected with the Boost sub-circuit, the drain electrode of the first switching tube is also connected with the second switching tube, and the source electrode of the second switching tube is connected with the output end of the Boost sub-circuit and is used for being closed when the first switching tube receives the first control signal or the third control signal, so that the grid electrode of the second switching tube is in a high level to close the charging state; the first switching tube is further used for being conducted when receiving the second control signal, so that the grid electrode of the second switching tube is in a low level to start the charging state;
the grid electrode of the third switching tube is connected with the detection and identification module, and the drain electrode of the third switching tube is connected with the output end of the Boost sub-circuit and is used for being closed when the first control signal or the second control signal is received so as to close the discharge state; and the third control signal is also used for being conducted when being received so as to start the discharging state.
Further preferably, the power supply switching circuit includes: a power supply switching chip and a fourth switching tube;
the first end of the power supply switching chip is connected with the output end of the charge-discharge circuit;
the second end of the power supply switching chip is connected with the detection and identification module through the fourth switching tube;
and the third end of the power supply switching chip is connected with a power supply voltage.
Further preferably:
the power supply switching circuit is used for switching the power supply channel into the first channel when receiving the first control signal and receiving the preset voltage output by the charging and discharging circuit and closing the charging and discharging state so as to whiten a display picture of the display module;
the power supply switching circuit is further configured to switch the power supply channel to the second channel when the second control signal is received and the preset voltage is received and the power supply channel is in a charging state, so as to maintain normal operation of the display module;
the power supply switching circuit is further configured to switch the power supply channel to the first channel when the third control signal is received and the third control signal is in a discharge state, so as to maintain the power failure of the display module and save a shutdown picture.
The information protection method comprises the following steps of:
detecting an abnormal power-down signal of the equipment through the detection and identification module, and sending a first control signal to the power supply control module;
the power supply control module receives the first control signal, closes the charge and discharge state of the display module, and switches the power supply channel of the display module into a first channel so as to make the potential difference between the input end and the output end of the display module zero;
and when the potential difference between the input end and the output end is zero, the display module is used for brushing the white display picture.
Compared with the prior art, the equipment with the electronic ink screen and the information protection method have the beneficial effects that:
the invention judges whether the power is normally turned off or not by utilizing the CPU, and controls the VCOM voltage of the ink screen through the GPIO pin, so that the screen content can be cleared when the power is abnormally turned off, and the purpose of protecting the system configuration information from being leaked is achieved.
Drawings
The above features, technical features, advantages and implementation manners of an apparatus and method with an electronic ink screen will be further described in a clear and understandable manner with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of one embodiment of an apparatus of the present invention having an electronic ink screen;
FIG. 2 is a schematic diagram of one embodiment of an apparatus having an electronic ink screen in accordance with the present invention;
FIG. 3 is a schematic diagram of a charge-discharge circuit according to the present invention;
FIG. 4 is a schematic diagram of a power switching circuit according to the present invention;
FIG. 5 is a schematic diagram of a charge-discharge circuit according to the present invention;
FIG. 6 is a flow chart of an information protection method according to the present invention;
fig. 7 is a flow chart of an information protection method in the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
It should be noted that, the electronic ink screen is also called as electronic paper display technology, and has the following characteristics:
a. bistable technology, even if the power supply source is removed, the picture can be continuously displayed and will not disappear. Only when the screen is replaced, the power consumption is required.
b. The reflective display screen is formed by using an ambient light source to strike the electronic paper display screen, and the brighter the ambient light source, the clearer and more visible the electronic paper.
C. The plastic substrate is stronger and less prone to fracture than the fragile glass substrate display screen, and when the terminal product falls or suffers impact, the damage probability of the product can be reduced.
Electronic ink screens have low refresh rates and are not suitable for mainstream devices, but some devices that display content and color in a single way may be used. The removable memory of the invention needs to display basic configuration information and adopts a 6-inch electronic ink screen.
Example 1
A first embodiment of the present invention, as shown in fig. 1, provides an apparatus having an electronic ink screen, including:
the power supply control device comprises a detection and identification module 1, a power supply control module 2 and a display module 3;
the detection and identification module 1 is connected with the power supply control module 2 and the display module 3, and is used for detecting abnormal power-off signals of equipment and sending a first control signal to the power supply control module 2.
As shown in fig. 3 and 4, the detection and identification module 1 is used for controlling the power control module 2 and the display module 3, which specifically includes the following cases:
a. when the system is normally powered on, the CPU sends out a control signal, at the moment, MB_charge is high, MB_discharge is low, VCOM_20V is charged to 20V, and the ink screen normally works.
b. When the system sends a shutdown command, the CPU sends a shutdown picture to the ink screen, and then sends a GPIO control signal, at the moment, MB_charge is low, MB_discharge is high, VCOM_20V discharges, and the system is normally shutdown.
c. When the system is abnormally powered down, MB_charge is low, MB_discharge is low, VCOM_20V is 20V, and the ink screen is brushed white.
The power control module 2 is connected with the display module 3, and is configured to receive the first control signal, close a charge-discharge state of the display module 3, and switch a power channel of the display module 3 to a first channel, so that a potential difference between an input end and an output end of the display module 3 is zero.
The display module 3 is configured to whiten a display screen when a potential difference between the input terminal and the output terminal is zero.
Illustratively, as shown in fig. 2, in the present embodiment, the detection and recognition module 1 includes a detection and recognition circuit including a CPU for detecting an abnormal power-down signal in real time, and controls the power supply control module 2 through the CPIO terminal of the CPU.
In this embodiment, the circuit design mainly includes three logic components as shown in the above figure:
1) Detection and identification circuit:
the CPU detects whether a normal shutdown signal exists or not, and then controls the power supply circuit through the GPIO.
2) The power control module 2 includes a power control circuit: charging and discharging and VCOM power supply switching are performed by the control signal of the GPIO of the CPU.
3) The display circuit: and displaying the configuration information transmitted by the CPU.
For example, as shown in fig. 3 and 4, when the system fails abnormally, mb_charge is low, mb_discharge is low, at this time, the MOS transistor Q3 is turned off, Q8 is turned off, vcom_20v is neither charged nor discharged, and the voltage is 20V. Switch U6 switches on SB channel, VCOM voltage of ink screen is 20V, ink screen is whitened.
Wherein the first channel is an SB channel.
The embodiment utilizes the CPU to judge whether the power is normally turned off or not, and controls the VCOM voltage of the ink screen through the GPIO pin, so that the screen content can be cleared when the power is abnormally turned off, and the purpose of protecting the system configuration information from being leaked is achieved.
Example two
Based on the foregoing embodiments, the same parts as those of the foregoing embodiments will not be described in detail in this embodiment, and this embodiment provides an apparatus with an electronic ink screen, which specifically includes:
preferably: the detection and identification module 1 is further configured to detect whether an abnormal power-off signal exists when a power-off command is received, and determine that an abnormal power-off state exists in the device when the abnormal power-off signal is detected, and send a first control signal to the power control module 2.
In this embodiment, after the detection and identification module 1 receives the shutdown command, whether the shutdown is abnormal is determined based on whether the detected power-down signal is abnormal.
Specifically, when an abnormal power-down signal is detected, an abnormality exists in shutdown at this time, a first control signal is sent to the power control module 2, so that the charge and discharge states of the display module 3 are closed, and the power supply channel of the display module 3 is switched to a first channel, so that the potential difference between the input end and the output end of the display module 3 is zero.
The display module 3 is configured to whiten a display screen when a potential difference between the input terminal and the output terminal is zero.
In this embodiment, the CPU may be used to determine whether the system is normally turned off, and control the VCOM voltage of the ink screen through the GPIO pin, so as to clear the screen content when the power is abnormally turned off, thereby achieving the purpose of protecting the system configuration information from being leaked.
Preferably: the detection and identification module is further used for sending a second control signal to the power supply control module when the normal working signal is detected.
The power supply control module is further configured to receive the second control signal, switch the charging state to the charging state, and switch the power supply channel of the display module to a second channel so that the display module works normally.
For example, as shown in fig. 3 and 4, when the system is operating normally, the level of mb_charge is high, the level of mb_discharge is low, the MOS transistor Q3 is turned on, the MOS transistor Q8 is turned off, and vcom_20v is in a charged state, and the voltage is 20V. Switch U6 switches between SA channels, and the VCOM voltage supplied by the ink screen PMIC is used, so that the ink screen works normally.
Preferably:
and the detection and identification module is used for sending a third control signal to the power supply control module and sending a shutdown picture to the display module when detecting the normal shutdown state of the equipment.
The power supply control module is used for receiving the third control signal, switching the charging state into the discharging state, and switching the power supply into the second channel so as to power down the display module.
The display module is used for receiving the shutdown picture and storing and displaying the shutdown picture after power failure.
For example, as shown in fig. 3 and 4, when the system issues a shutdown command, mb_charge is low, mb_discharge is high, at this time, the MOS transistor Q3 is closed, Q8 is opened, vcom_20v stops charging, discharging starts, and the voltage gradually decreases to 0V. The CPU sends a shutdown screen to the ink screen. And switching the Switch U6 on the SA channel, and storing a shutdown picture after the ink screen is powered down.
In this embodiment, if there is no abnormal power-off signal, when the device system operates normally, the power control module 2 provides the operating voltage to the display module 3, so as to ensure that the electronic ink screen operates normally. Meanwhile, when a shutdown command is received and no abnormal power-down signal is detected, the detection and identification module 1 sends a third control signal to the power control module 2 to switch the power channel to the second channel (SA). At this time, there is a potential difference between the input terminal (vcom_20v) and the output terminal (vcom_pmic) of the display module 3, the output terminal of the power switching chip (Switch U16) is switched in the second channel (SA channel), the output terminal (vcom_pmic) is a VCOM voltage supplied by the ink screen PMIC, the PMIC is a voltage release path, the ground loop is formed by the PMIC under normal conditions, and the ink screen normally works.
Example III
Based on the foregoing embodiments, the same parts as those of the foregoing embodiments will not be described in detail in this embodiment, and this embodiment provides an apparatus with an electronic ink screen, which specifically includes:
preferably, the power control module includes:
and the charge-discharge circuit is connected with the detection and identification module and is used for receiving the first control signal or the second control signal or the third control signal so as to control the charge-discharge state.
Preferably, the charge and discharge circuit includes:
and the Boost sub-circuit is used for providing the preset voltage.
Illustratively, as shown in FIG. 3, the Boost sub-circuit includes: boost chip (Boost IC), model may include: MP1541, its main functions: a brush screen 20V voltage is provided. The enabling end of the Boost chip is connected with the port (MB_charge) of the detection and identification module 1, the input end (IN) of the Boost chip is connected with the 5V voltage input end, and the port (SW FB) of the Boost chip is connected with the second switching tube (Q3) and the first switching tube (Q4) through a series of resistors (R123, R112, R114, R30, R126, R108 and R121) and filter capacitors (C98 and C99).
And the charge-discharge sub-circuit is connected with the Boost sub-circuit and the detection and identification module and is used for closing the charge-discharge state of the display module after receiving the first control signal.
Preferably, the charge and discharge electronic circuit includes: the switching device comprises a first switching tube, a second switching tube and a third switching tube.
The grid electrode of the first switching tube is connected with the detection and identification module, the drain electrode of the first switching tube is connected with the Boost sub-circuit, the drain electrode of the first switching tube is also connected with the second switching tube, and the source electrode of the second switching tube is connected with the output end of the Boost sub-circuit and is used for being closed when the first switching tube receives the first control signal or the third control signal, so that the grid electrode of the second switching tube is in a high level to close the charging state; the first switching tube is further used for being conducted when receiving the second control signal, so that the grid electrode of the second switching tube is in a low level to start the charging state;
the grid electrode of the third switching tube is connected with the detection and identification module, and the drain electrode of the third switching tube is connected with the output end of the Boost sub-circuit and is used for being closed when the first control signal or the second control signal is received so as to close the discharge state; and the third control signal is also used for being conducted when being received so as to start the discharging state.
Exemplary, as shown in fig. 3, the charge-discharge electronic circuit includes: a first switching tube (Q4), a second switching tube (Q3) and a third switching tube (Q8).
The grid of first switch tube (Q4) with detect identification module 1 is connected, the drain electrode of first switch tube (Q4) with Boost sub-circuit is connected, the drain electrode of first switch tube (Q4) still with second switch tube (Q3).
The source of the first switching tube (Q4) is grounded, and is also connected to the port (mb_charge) of the detection and identification module 1 through a resistor (R122).
The source electrode (4) of the second switching tube (Q3) is connected with the output end of the Boost sub-circuit, and is used for closing the charging state when the first switching tube (Q4) receives the first control signal or the third control signal to be closed, and the grid electrode (3) of the second switching tube (Q3) is in a high level; and the first switch tube (Q4) is further used for being conducted when receiving the second control signal, so that the grid electrode (3) of the second switch tube (Q3) is in a low level to start the charging state.
The grid electrode of the third switching tube (Q8) is connected with the detection and identification module, and the drain electrode of the third switching tube (Q8) is connected with the output end of the Boost sub-circuit and is used for being closed when the first control signal or the second control signal is received so as to close the discharge state; and the third control signal is also used for being conducted when being received so as to start the discharging state.
The grid electrode of the third switch tube (Q8) is grounded through a resistor (R167). The drain electrode of the third switching tube (Q8) is connected with the output end (VCOM_20V) of the Boost sub-circuit through a resistor (R119), and the port (VCOM_20V) is a public power supply end.
Illustratively, as shown in fig. 3, the Boost sub-circuit is configured to be externally connected with a 5V voltage, convert the 5V voltage into a 20V voltage, and provide the 20V voltage to the display module 3, i.e. the electronic ink screen.
The switching device comprises a first switching tube (Q4), a second switching tube (Q3) and a third switching tube (Q8).
Illustratively, the first switching tube (Q4) and the third switching tube (Q8) may comprise N-MOSFETs, the model comprising: BSS138, whose main functions are: acting as a switch. The second switching tube (Q3) may comprise a P-MOSFET, the model comprising: p4402FAG has the main functions of: and the switch is used for controlling charge and discharge.
For example, when the system works normally, the detection and identification module 1 sends out a second control signal, mb_charge is at a high level, mb_discharge is at a low level, at this time, the second switching tube (MOS tube Q3) is turned on, the third switching tube (Q8) is turned off, vcom_20v is in a charging state, and the voltage is 20V. Switch U6 switches between SA channels, and the VCOM voltage supplied by the ink screen PMIC is used, so that the ink screen works normally.
b. When the system sends out a shutdown command, the detection and identification module 1 sends out a third control signal, MB_charge is low, MB_discharge is high, at the moment, the MOS tube Q3 is closed, the Q8 is opened, VCOM_20V stops charging, discharging is started, and the voltage is gradually reduced to 0V. The CPU sends a shutdown screen to the ink screen. And switching the Switch U6 on the SA channel, and storing a shutdown picture after the ink screen is powered down.
c. When the system is abnormally powered down, the detection and identification module 1 sends a first control signal, MB_charge is low, MB_discharge is low, the MOS transistor Q3 is closed, the Q8 is closed, VCOM_20V is neither charged nor discharged, and the voltage is 20V. Switch U6 switches on SB channel, VCOM voltage of ink screen is 20V, ink screen is whitened.
Preferably, the power control module includes:
and the power supply switching circuit is connected with the charge-discharge circuit and the detection and identification module and is used for receiving the first control signal or the second control signal and switching a power supply channel.
Preferably, the power supply switching circuit includes: and the power supply switching chip and the fourth switching tube.
The first end of the power supply switching chip is connected with the output end of the charging and discharging circuit.
The second end of the power supply switching chip is connected with the detection and identification module through the fourth switching tube.
And the third end of the power supply switching chip is connected with a power supply voltage.
For example, as shown in fig. 4, the model of the power switching chip (SPDT switch) may include: ADG5419, its main functions are: serving as a power supply switch. The fourth switching tube is an N-MOSFET (Q11) in the figure: BSS138, primary function: acting as a switch.
The grid electrode of the fourth switching tube is connected with a port (MB_charge) of the detection and identification module 1;
the source electrode of the fourth switching tube is grounded;
the drain electrode of the fourth switching tube is connected with a common power supply end (VCOM_20V) through a pull-up resistor (R170), grounded through a pull-down resistor (R19) and connected with an input end (IN) of a power supply switching chip through the pull-down resistor (R19).
The first channel (SB) of the power switching chip (U16) is connected with the port (VCOM_PMIC), the second channel (SA) of the power switching chip (U16) is connected with the common power supply end (VCOM_20V), and the port (VDD) of the power switching chip (U16) is connected with the common power supply end (VCOM_20V) through a resistor (R168).
Illustratively, when the state of the port (IN) is 0, the first channel (SB) is IN an OFF state and the second channel (SA) is IN an ON state; when the state of the port (IN) is 1, the first channel (SB) is IN an ON state and the second channel (SA) is IN an OFF state.
Preferably:
the power supply switching circuit is used for switching the power supply channel into the first channel when receiving the first control signal and receiving the preset voltage output by the charge-discharge circuit and closing the charge-discharge state so as to whiten the display picture of the display module.
The power supply switching circuit is further configured to switch the power supply channel to the second channel when the second control signal is received and the preset voltage is received and the power supply channel is in a charging state, so as to maintain normal operation of the display module.
The power supply switching circuit is further configured to switch the power supply channel to the first channel when the third control signal is received and the third control signal is in a discharge state, so as to maintain the power failure of the display module and save a shutdown picture.
For example, as shown in fig. 5, the charge-discharge circuit is in operation, the detection and identification module 1 detects the states of the ports (mb_charge, mb_discharge), and controls the state of the power control module 2, and when the ports mb_charge is 1 and mb_discharge is 0, the device is in normal operation (System normal work). When port mb_charge is 0 and mb_discharge is 1, the device is normally powered off (System normal shut down). When the port mb_charge is 1 and mb_discharge is 1, the device is in the disabled state (this state is not allow). When the port mb_charge is 0 and mb_discharge is 0, the device is in an abnormal shutdown state (System abnormal shut down).
In this embodiment, the charging and discharging circuit and the power supply switching circuit are designed to control the charging and discharging of the display module so as to control the voltages of two public power supply terminals of the display module, so that the display module performs the screen cleaning operation when the potential difference between the public power supply terminals is zero, and the problem of information leakage drain caused by abnormal power failure or abnormal shutdown is avoided.
Example IV
Based on the foregoing embodiments, the same parts as those of the foregoing embodiments will not be described in detail, and as shown in fig. 6 and 7, the present embodiment provides an information protection method, and the application of the device with an electronic ink screen specifically includes:
s100, detecting an abnormal power-down signal of the equipment through the detection and identification module, and sending a first control signal to the power supply control module.
S200, the power control module receives the first control signal, closes the charge and discharge state of the display module, and switches the power channel of the display module into a first channel so as to enable the potential difference between the input end and the output end of the display module to be zero.
S300, the display module is used for brushing the display picture when the potential difference between the input end and the output end is zero.
Specifically, the CPU is utilized to judge whether the power is normally turned off or not, and the VCOM voltage of the ink screen is controlled through the GPIO pin, so that the screen content can be cleared when abnormal power is turned off, and the purpose of protecting the system configuration information from being leaked is achieved.
Exemplary, specifically included are the following:
a. when the system works normally, MB_charge is high, MB_discharge is low, at the moment, the MOS transistor Q3 is opened, the MOS transistor Q8 is closed, VCOM_20V is in a charging state, and the voltage is 20V. Switch U6 switches between SA channels, and the VCOM voltage supplied by the ink screen PMIC is used, so that the ink screen works normally.
b. When the system sends a shutdown command, MB_charge is low, MB_discharge is high, at the moment, the MOS transistor Q3 is closed, the MOS transistor Q8 is opened, VCOM_20V stops charging, discharging is started, and the voltage is gradually reduced to 0V. The CPU sends a shutdown screen to the ink screen. And switching the Switch U6 on the SA channel, and storing a shutdown picture after the ink screen is powered down.
c. When the system is abnormally powered down, MB_charge is low, MB_discharge is low, at the moment, the MOS transistor Q3 is closed, the MOS transistor Q8 is closed, VCOM_20V is neither charged nor discharged, and the voltage is 20V. Switch U6 switches on SB channel, VCOM voltage of ink screen is 20V, ink screen is whitened.
The invention uses simple electronic devices such as a capacitor, a resistor, a field effect transistor, an SPDT switch and the like, and is matched with a CPU to realize the removal of the content of the ink screen of the movable storage device under abnormal power failure and abnormal shutdown states, thereby achieving the purpose of protecting the system information from being leaked.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (7)

1. An apparatus having an electronic ink screen, comprising:
the device comprises a detection and identification module, a power supply control module and a display module;
the detection and identification module is connected with the power supply control module and the display module and is used for detecting abnormal power-off signals of equipment and sending a first control signal to the power supply control module;
the power supply control module is connected with the display module and is used for receiving the first control signal, controlling the charge and discharge states of the display module and switching the power supply channel of the display module into a first channel so as to enable the potential difference between the input end and the output end of the display module to be zero;
the power supply control module comprises a power supply switching circuit, wherein the power supply switching circuit is used for switching the power supply channel into the first channel when receiving the first control signal, receiving the preset voltage output by the charge-discharge circuit and closing the charge-discharge state so as to whiten the display picture of the display module;
the power supply switching circuit is further used for switching the power supply channel into a second channel when receiving a second control signal and receiving the preset voltage and being in a charging state so as to maintain the normal operation of the display module;
the power supply switching circuit is further used for switching the power supply channel into the first channel when receiving a third control signal and being in a discharging state so as to maintain the power-down of the display module and save a shutdown picture;
the display module is used for brushing a display picture when the potential difference between the input end and the output end is zero;
a charge-discharge electronic circuit comprising: the first switching tube, the second switching tube and the third switching tube;
the grid electrode of the first switching tube is connected with the detection and identification module, the drain electrode of the first switching tube is connected with the Boost sub-circuit, the drain electrode of the first switching tube is also connected with the second switching tube, and the source electrode of the second switching tube is connected with the output end of the Boost sub-circuit and is used for being closed when the first switching tube receives the first control signal or the third control signal, so that the grid electrode of the second switching tube is in a high level to close the charging state; the first switch tube is further used for being conducted when receiving the second control signal, so that the grid electrode of the second switch tube is in a low level to start a charging state;
the grid electrode of the third switching tube is connected with the detection and identification module, and the drain electrode of the third switching tube is connected with the output end of the Boost sub-circuit and is used for being closed when the first control signal or the second control signal is received so as to close the discharge state; and is further configured to turn on when the third control signal is received, so as to turn on the discharge state;
the power supply switching circuit includes: a power supply switching chip and a fourth switching tube; the first end of the power supply switching chip is connected with the output end of the charge-discharge circuit; the second end of the power supply switching chip is connected with the detection and identification module through the fourth switching tube; and the third end of the power supply switching chip is connected with a power supply voltage.
2. The apparatus with electronic ink screen of claim 1, wherein:
the detection and identification module is further used for detecting whether an abnormal power-off signal exists or not when a shutdown command is received, determining that the equipment has an abnormal shutdown state when the abnormal power-off signal is detected, and sending a first control signal to the power supply control module.
3. The apparatus with electronic ink screen of claim 1, wherein:
the detection and identification module is further used for sending a second control signal to the power supply control module when the normal working signal is detected;
the power supply control module is further configured to receive the second control signal, switch the discharging state to the charging state, and switch the power supply channel of the display module to the second channel so that the display module works normally.
4. The apparatus with electronic ink screen of claim 2, wherein:
the detection and identification module is used for sending a third control signal to the power control module and sending a shutdown picture to the display module when detecting the normal shutdown state of the equipment;
the power supply control module is used for receiving the third control signal, switching the charging state into the discharging state, and switching the power supply into the second channel so as to power down the display module;
the display module is used for receiving the shutdown picture and storing and displaying the shutdown picture after power failure.
5. The device with an electronic ink screen according to any one of claims 1 to 4, wherein the power control module includes:
the charge-discharge circuit is connected with the detection and identification module and is used for receiving the first control signal or the second control signal or the third control signal so as to control the charge-discharge state;
and the power supply switching circuit is connected with the charge-discharge circuit and the detection and identification module and is used for receiving the first control signal or the second control signal and switching a power supply channel.
6. The device with electronic ink screen of claim 5, wherein the charge-discharge circuit comprises:
a Boost sub-circuit for providing a preset voltage;
and the charge-discharge sub-circuit is connected with the Boost sub-circuit and the detection and identification module and is used for controlling the charge-discharge state of the display module after receiving the first control signal.
7. An information protection method, characterized in that the device with the electronic ink screen according to any one of claims 1 to 6 is applied, and specifically comprises:
detecting an abnormal power-down signal of the equipment through the detection and identification module, and sending a first control signal to the power supply control module;
the power supply control module receives the first control signal, closes the charge and discharge state of the display module, and switches the power supply channel of the display module into a first channel so as to make the potential difference between the input end and the output end of the display module zero;
and when the potential difference between the input end and the output end is zero, the display module is used for brushing the white display picture.
CN202110625617.2A 2021-06-04 2021-06-04 Equipment with electronic ink screen and information protection method Active CN113346608B (en)

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CN109616069A (en) * 2019-01-14 2019-04-12 合肥京东方光电科技有限公司 Input voltage processing method, device, display base plate and display device
CN110097860A (en) * 2019-04-17 2019-08-06 昆山龙腾光电有限公司 Display module
CN112150976A (en) * 2019-06-28 2020-12-29 格科微电子（上海）有限公司 Power-down screen cleaning method for liquid crystal display screen

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109616069A (en) * 2019-01-14 2019-04-12 合肥京东方光电科技有限公司 Input voltage processing method, device, display base plate and display device
CN110097860A (en) * 2019-04-17 2019-08-06 昆山龙腾光电有限公司 Display module
CN112150976A (en) * 2019-06-28 2020-12-29 格科微电子（上海）有限公司 Power-down screen cleaning method for liquid crystal display screen

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