Electronic table card circuit and electronic table card

Abstract

The invention provides an electronic table card circuit and an electronic table card, and relates to the technical field of display. The circuit comprises a display control module, a power supply module connected with the display control module, a charging management module connected with the display control module and a standby power supply module connected with the charging management module, wherein the charging management module is also connected with external equipment; the display control module is configured to send a power lack signal to the charging management module when the electric quantity of the power supply module is less than or equal to a preset electric quantity; and the charging management module is configured to control the standby power supply module to supply power to the display control module under the control of an insufficient-voltage signal, and supply power to the standby power supply module and the display control module under the control of a charging signal sent by an external device. According to the invention, the endurance time of the electronic table card is obviously prolonged.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an electronic table card circuit and an electronic table card. Background Art

[0002] Double-sided electronic table signs have been widely used in large-scale occasions such as modern conferences and forums. Their main forms include double-sided EPD (Electrophoretic Display) screens, double-sided LCD (Liquid Crystal Display) screens, and a combination of one LCD screen and one EPD screen. These products have significant advantages in providing flexibility and convenience in information display. However, the battery life of double-sided electronic table signs in the prior art is usually only about 6 hours. When the usage time exceeds the battery life of the device, the insufficient power supply capacity of the table sign will cause display interruption, which will have a negative impact on the customer experience. Summary of the invention

[0003] In view of this, the purpose of this application is to provide an electronic table card circuit and an electronic table card to increase the battery life of the electronic table card.

[0004] Based on the above purpose, the present application provides an electronic table card circuit, including: a display control module, a power module connected to the display control module, a charging management module connected to the display control module, and a backup power module connected to the charging management module, wherein the charging management module is also connected to an external device;

[0005] The display control module is configured to send a low-power signal to the charging management module when the power of the power module is less than or equal to a preset power;

[0006] The charging management module is configured to control the backup power module to supply power to the display control module under the control of a power-deficit signal, and to supply power to the backup power module and the display control module under the control of a charging signal sent by an external device.

[0007] Based on the above purpose, the present application provides an electronic table card, including the above electronic table card circuit.

[0008] From the above, it can be seen that the electronic table card circuit and electronic table card provided by the present application, wherein the circuit includes: a display control module, a power module connected to the display control module, a charging management module connected to the display control module, and a backup power module connected to the charging management module, and the charging management module is also connected to an external device; the display control module is configured to send a low-power signal to the charging management module when the power of the power module is less than or equal to the preset power; the charging management module is configured to control the backup power module to supply power to the display control module under the control of the low-power signal, and to supply power to the backup power module and the display control module under the control of the charging signal sent by the external device. The battery life of the electronic table card is significantly extended by the backup power module, and the charging management module can also switch the power source, and supply power through the backup power module or an external device, thereby avoiding display interruption caused by exhaustion of the power of the power module during long-term use, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 The principle of the electronic table card circuit of the embodiment of this application Figure 1 ;

[0011] Figure 2 The principle of the electronic table card circuit of the embodiment of this application Figure 2 ;

[0012] Figure 3 The principle of the electronic table card circuit of the embodiment of this application Figure 3 ;

[0013] Figure 4 The principle of the electronic table card circuit of the embodiment of this application Figure 4 ;

[0014] Figure 5 The principle of the electronic table card circuit of the embodiment of this application Figure 5 ;

[0015] Figure 6 The principle of the electronic table card circuit of the embodiment of this application Figure 6 ;

[0016] Figure 7 The circuit of the electronic table card circuit of the embodiment of the present application Figure 1 ;

[0017] Figure 8 The circuit of the electronic table card circuit of the embodiment of the present application Figure 2 .

[0018] In the figure, 1. display control module, 2. power module, 3. charging management module, 4. backup power module, 5. external device, 6. MCU, 7. overvoltage protection unit, 8. switch unit, 9. first switch, 10. second switch, 11. direction switching unit, 12. voltage regulator, 13. third switch, 14. fourth switch, 15. first sub-display control module, 16. first sub-power module, 17. second sub-display control module, and 18. second sub-power module. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] In the related art, double-sided electronic table cards have been widely used in large occasions such as modern conferences and forums. The main forms include double-sided EPD (Electrophoretic Display) screens, double-sided LCD (Liquid Crystal Display) screens, and a combination of one LCD screen and one EPD screen. These products have significant advantages in providing flexibility and convenience in information display. However, the double-sided electronic table cards in the prior art have certain defects in power supply design, which makes it difficult to meet the needs of long-term use. There are two main power supply designs for existing double-sided electronic table cards: one is that each display screen is equipped with an independent battery power supply, and the other is that the two display screens share a battery power supply. Regardless of which solution is adopted, the battery life of the double-sided electronic table cards in the prior art is usually only about 6 hours. This is obviously insufficient for some meetings that last longer (such as more than 10 hours). When the meeting time exceeds the device battery life, the insufficient power supply capacity of the table card will cause display interruption, which will have a negative impact on the customer experience. At present, although the battery life of the table card can be extended by replacing the battery or connecting an external power supply, these methods are not convenient in actual operation and will affect the normal progress of the meeting. The existing technology lacks an effective solution that can ensure the long-term stable operation of the double-sided electronic table card without affecting the user experience.

[0022] Based on the above problems, the applicant found that: design an electronic table card circuit, including: a display control module, a power module connected to the display control module, a charging management module connected to the display control module, and a backup power module connected to the charging management module, the charging management module is also connected to an external device; the display control module is configured to send a low-power signal to the charging management module when the power of the power module is less than or equal to the preset power; the charging management module is configured to control the backup power module to supply power to the display control module under the control of the low-power signal, and to supply power to the backup power module and the display control module under the control of the charging signal sent by the external device. The backup power module significantly extends the battery life of the electronic table card, and the charging management module can also switch the power source, and supply power through the backup power module or external devices, thereby avoiding display interruption caused by the exhaustion of the power module during long-term use, thereby improving the user experience.

[0023] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0024] In some embodiments, the electronic table card circuit, such as Figure 1As shown, it includes: a display control module 1, a power module 2 connected to the display control module 1, a charging management module 3 connected to the display control module 1, and a backup power module 4 connected to the charging management module 3, and the charging management module 3 is also connected to an external device 5;

[0025] The display control module 1 is configured to send a low-power signal to the charging management module 3 when the power of the power module 2 is less than or equal to a preset power;

[0026] The charging management module 3 is configured to control the backup power module 4 to supply power to the display control module 1 under the control of a power-deficit signal, and to supply power to the backup power module 4 and the display control module 1 under the control of a charging signal sent by an external device 5 .

[0027] Specifically, the display control module 1 is usually used to control the display information and monitor the power of the power module 2. When the power of the power module 2 is less than or equal to the preset power (for example, the preset power can be set to 20%), the display control module 1 will send a low-power signal to the charging management module 3. The power module 2 is the main power source for the display control module 1, usually a built-in rechargeable battery. Under normal circumstances, the display control module 1 directly obtains power from the power module 2. The charging management module 3 is used to coordinate the use of the backup power module 4 and the external device 5. When receiving the low-power signal sent by the display control module 1, the charging management module 3 will activate the backup power module 4 to ensure that the display control module 1 continues to obtain power supply, and can charge the power module 2 at the same time. When connected to the external device 5 (for example, connected to the external device 5 via the Type-C interface), the charging management module 3 not only supplies power to the display control module 1, but also charges the backup power module 4 to ensure that the backup power module 4 has enough power when needed. The backup power module 4 serves as a supplementary power source for the power module 2. When the power of the power module 2 is lower than the preset power, the backup power module 4 will supply power to the display control module 1 under the control of the charging management module 3 to extend the battery life of the electronic table card. When the external device 5 is connected, the charging management module 3 will give priority to using the external device 5 to supply power and charge the display control module 1 and the backup power module 4.

[0028] The backup power module 4 significantly extends the battery life of the electronic table sign. The charging management module 3 can intelligently switch the power source to ensure that the device can operate stably under various conditions, avoiding display interruptions caused by the exhaustion of power in the power module 2 during long-term use, thereby improving the user experience.

[0029] Further, if Figure 2As shown, the charging management module 3 includes: an MCU6, an overvoltage protection unit 7 and a switch unit 8 connected to a first pin M1 of the MCU6, a second pin M2 of the MCU6 is connected to the backup power module 4, the switch unit 8 is also connected to the display control module 1, and the overvoltage protection unit 7 and the switch unit 8 are also connected to an external device 5;

[0030] The overvoltage protection unit 7 is configured to be turned on when the voltage of the external device 5 is less than or equal to a preset voltage, so as to send a charging signal of the external device 5 to the MCU 6;

[0031] The switch unit 8 is configured to be turned on under the control of a power-deficit signal so that the MCU6 controls the backup power module to supply power to the display control module 1 , or to be turned on under the control of a charging signal so that the external device 5 supplies power to the display control module 1 .

[0032] Specifically, the first pin M1 of MCU6 is connected to the overvoltage protection unit 7 for controlling the input of the external device 5. The second pin M2 of MCU6 is connected to the backup power module 4 for managing the charging state of the backup power module 4. According to the received signal, MCU6 controls the output of the backup power module 4 to ensure the correct distribution of power. The overvoltage protection unit 7 is used to protect the circuit from damage caused by overvoltage of the external device 5. When the voltage of the external device 5 is less than or equal to the preset voltage (exemplarily, the preset voltage can be set to 5.6V), the overvoltage protection unit 7 is turned on and the charging signal of the external device 5 is sent to the switch unit 8. If the voltage of the external device 5 exceeds the preset voltage, the overvoltage protection unit 7 will be disconnected to prevent the circuit from being damaged by excessive voltage. The switch unit 8 is used to switch between different power sources. When the display control module 1 sends a power shortage signal, the switch unit 8 is turned on, so that the MCU6 controls the backup power module 4 to supply power to the display control module 1. When the external device 5 sends a charging signal, the switch unit 8 is turned on, so that the external device 5 supplies power to the display control module 1 and the backup power module 4.

[0033] The overvoltage protection unit 7 effectively prevents the external device 5 from damaging the circuit due to excessive voltage, thereby improving the circuit safety and reliability. The backup power module 4 significantly extends the battery life of the electronic table card to meet the needs of long-term use. The switch unit 8 can automatically switch between different power sources to ensure the continuity and stability of the power supply.

[0034] Further, if Figure 3As shown, the switch unit 8 includes: a first switch 9 and a second switch 10; the control end of the first switch 9 is connected to the external device 5 and the display control module 1, the first pole of the first switch 9 is connected to the control end of the second switch 10, and the second pole of the first switch 9 is grounded; the first pole of the second switch 10 is connected to the first pin M1 of the MCU 6, and the second pole of the second switch 10 is connected to the display control module 1;

[0035] The first switch 9 is configured to be turned on under the control of the charging signal of the external device 5 or the power-deficient signal of the display control module 1 , so that the second switch 10 is turned on, and the overvoltage protection unit 7 or MCU6 supplies power to the display control module 1 through the second switch 10 .

[0036] Specifically, the control end of the first switch 9 is connected to the signal output end of the external device 5 and the display control module 1 to control according to the charging signal of the external device 5 or the power-deficient signal of the display control module 1. The first pole of the first switch 9 is connected to the control end of the second switch 10, and the second pole of the first switch 9 is grounded. The first pole of the second switch 10 is connected to the first pin M1 of the MCU6, and the second pole is connected to the power supply end of the display control module 1. The conduction state of the second switch 10 is controlled by the first switch 9. When the external device 5 is connected and provides a charging signal, or when the display control module 1 detects insufficient power and sends a power-deficient signal, the charging signal or the power-deficient signal will be transmitted to the control end of the first switch 9. The first switch 9 will be turned on after receiving the signal. After the first switch 9 is turned on, its first pole is connected to the control end of the second switch 10, so that the second switch 10 is turned on. When the second switch 10 is turned on, the first pin M1 of the MCU6 supplies power to the display control module 1 through the second switch 10. That is, if the charging signal of the external device 5 causes the first switch 9 to be turned on, then the external device 5 supplies power to the display control module 1 through the overvoltage protection unit 7 and the second switch 10; if the low-power signal of the display control module 1 causes the first switch 9 to be turned on, then the backup power supply module 4 supplies power to the display control module 1 through the second switch 10 under the control of the MCU6.

[0037] Through the combination of the first switch 9 and the second switch 10, the status of the external device 5 and the display control module 1 can be automatically detected, and the power supply source can be automatically switched, reducing the need for human intervention. The design of the switch unit 8 ensures the continuity and stability of the power supply, avoiding display interruptions caused by insufficient power. Whether the external device 5 is connected or the backup power module 4 is started, it can be flexibly responded to, ensuring that the display control module 1 always obtains a stable power supply, significantly improving the user experience.

[0038] Further, if Figure 4As shown, the electronic table card circuit includes: a direction switching unit 11, a first pole of the direction switching unit 11 is connected to the overvoltage protection unit 7, a control end of the direction switching unit 11 is connected to the third pin M3 of the MCU6, a second pole of the direction switching unit 11 is connected to the first pin M1 of the MCU6, and a circuit detection node N1 is further provided between the direction switching unit 11 and the overvoltage protection unit 7, and the circuit detection node N1 is connected to the fourth pin M4 of the MCU6;

[0039] The MCU 6 is configured to send a reverse switching signal through the third pin M3 when a charging signal of the external device 5 is detected on the circuit detection node N1;

[0040] The direction switching unit 11 is configured to be turned on under the control of the reverse switching signal sent by the third pin M3 of the MCU 6 , so that the MCU 6 controls the backup power module 4 to supply power to the external device 5 .

[0041] Specifically, the direction switching unit 11 is used to switch between different power supply directions, that is, to output the power of the backup power module 4 to the external device 5 when necessary, and the external device 5 is connected to the overvoltage protection unit 7 and the switch unit 8. The first pole of the direction switching unit 11 is connected to the overvoltage protection unit 7, the control end of the direction switching unit 11 is connected to the third pin M3 of the MCU6, and the second pole of the direction switching unit 11 is connected to the first pin M1 of the MCU6. The circuit detection node N1 is located between the direction switching unit 11 and the overvoltage protection unit 7, and is used to detect the charging signal of the external device 5. The circuit detection node N1 is connected to the fourth pin M4 of the MCU6. When the external device 5 is connected to the electronic table card and sends a charging signal, the circuit detection node N1 will detect the signal and transmit it to the fourth pin M4 of the MCU6. The MCU6 determines that the external device 5 needs to be charged by detecting the charging signal. When MCU6 detects the charging signal of the external device 5, it sends a reverse switching signal through the third pin M3, and the direction switching unit 11 is turned on under the control of the reverse switching signal of MCU6, so that the power of the backup power module 4 is output to the external device 5 through the direction switching unit 11.

[0042] The direction switching unit 11 enables the electronic table card not only to receive power from the external device 5, but also to provide power to the external device 5 when necessary, thereby improving the versatility of the device. The MCU 6 controls the conduction of the direction switching unit 11 by detecting the charging signal of the external device 5, thereby realizing the flexible use of the backup power module 4.

[0043] Further, if Figure 5As shown, the overvoltage protection unit 7 includes a voltage stabilizer 12, a third switch 13 and a fourth switch 14, the voltage stabilizer is connected to the external device 5, the control end of the third switch 13 is connected to the voltage stabilizer and the external device 5, the first pole of the third switch 13 is connected to the external device 5, the second pole of the third switch 13 is connected to the control end of the fourth switch 14, the first pole of the fourth switch 14 is connected to the external device 5, and the second pole of the fourth switch 14 is connected to the first pole of the direction switching unit 11;

[0044] The voltage regulator is configured to be disconnected when the voltage of the external device 5 is less than or equal to a preset voltage, so that the third switch 13 is disconnected and the fourth switch 14 is turned on, and the voltage regulator is turned on when the voltage of the external device 5 is greater than the preset voltage, so that the third switch 13 is turned on and the fourth switch 14 is disconnected.

[0045] Specifically, the voltage regulator 12 is used to detect the voltage of the external device 5 and perform corresponding control according to the voltage level. The voltage regulator 12 is connected to the external device 5, and the control end of the third switch 13 is connected to the voltage regulator 12 and connected to the external device 5. The first pole of the third switch 13 is connected to the external device 5, and the second pole is connected to the control end of the fourth switch 14. The first pole of the fourth switch 14 is connected to the external device 5, and the second pole is connected to the first pole of the direction switching unit 11. The conduction state of the fourth switch 14 is controlled by the third switch 13. The voltage regulator 12 is used to detect the voltage of the external device 5 and is turned on when the voltage exceeds the preset voltage. When the voltage of the external device 5 is less than or equal to the preset voltage, the voltage regulator 12 is disconnected, and the third switch 13 is disconnected, so that the fourth switch 14 is turned on, and the power of the external device 5 can be transmitted to the first pole of the direction switching unit 11 through the fourth switch 14. When the voltage of the external device 5 exceeds the preset voltage, the voltage regulator 12 is turned on, causing the third switch 13 to be turned on. After the third switch 13 is turned on, its second electrode is connected to the control end of the fourth switch 14, so that the fourth switch 14 is turned off. After the fourth switch 14 is turned off, the power of the external device 5 cannot be transmitted to the direction switching unit 11 through the fourth switch 14, thereby achieving overvoltage protection and preventing the circuit from being damaged by excessive high voltage.

[0046] Through the combined design of the voltage stabilizer 12, the third switch 13 and the fourth switch 14, effective monitoring and control of the voltage of the external device 5 is achieved, ensuring that the circuit is automatically disconnected when the voltage is too high, protecting the safety of the entire circuit and ensuring that the circuit operates normally within a safe voltage range.

[0047] Further, if Figure 7 As shown, the voltage regulator 12 includes a voltage regulator diode D1, a cathode of the voltage regulator diode D1 is connected to the external device 5, an anode of the voltage regulator diode D1 is grounded, the third switch 13 includes a third transistor Q3, and the fourth switch 14 includes a fourth transistor Q4.

[0048] Specifically, the voltage stabilizing diode D1 is a special diode that maintains a constant voltage when the voltage reaches its breakdown voltage, thereby playing a voltage stabilizing role. The cathode of the voltage stabilizing diode D1 is connected to the external device 5, and the anode is grounded. The control end of the third transistor Q3 is connected to the voltage stabilizing diode D1 and to the external device 5. The first pole of the third transistor Q3 is connected to the external device 5, and the second pole is connected to the control end of the fourth transistor Q4. The first pole of the fourth transistor Q4 is connected to the external device 5, and the second pole is connected to the first pole of the direction switching unit 11, and the conduction state of the fourth transistor Q4 is controlled by the third transistor Q3. When the voltage of the external device 5 is lower than the breakdown voltage of the voltage stabilizing diode D1, the voltage stabilizing diode D1 is not turned on, and the third transistor Q3 is turned off. After the third transistor Q3 is turned off, its second pole is connected to the control end of the fourth transistor Q4, so that the fourth transistor Q4 is turned on. After the fourth transistor Q4 is turned on, the power of the external device 5 can be transmitted to the first pole of the direction switching unit 11 through the fourth transistor Q4.

[0049] It should be noted that the overvoltage protection unit 7 further includes a first resistor R1 and a second resistor R2, and the voltage zener diode D1 is connected to the external device 5 through the first resistor R1. The first resistor R1 is connected between the external device 5 and the voltage zener diode D1, and is used to limit current and divide voltage. The second resistor R2 is connected between the voltage zener diode D1 and the control end of the third transistor Q3, and further adjusts the voltage to control the conduction state of the third transistor Q3. The control end of the third transistor Q3 is connected to the voltage zener diode D1 through the second resistor R2, and is connected to the external device 5 through the first resistor R1 and the second resistor R2. The overvoltage protection unit 7 also includes a VBUS_C terminal connected to the external device 5, and the VBUS_C terminal is grounded through a first capacitor C1, a second capacitor C2, and a third capacitor C3 for filtering. A fourth capacitor C4 and a third resistor R3 are connected between the first electrode (source) and the control end (gate) of the fourth transistor Q4 for filtering and current limiting. The second electrode (collector) of the third transistor Q3 is grounded through a fourth resistor R4. The circuit detection node N1 is also grounded through a fifth resistor R5 and a fifth capacitor C5, and is also grounded through a sixth capacitor C6 connected in parallel with the fifth resistor R5 and the fifth capacitor C5.

[0050] Through the combined design of the voltage-stabilizing diode D1 and the transistor, effective monitoring and control of the voltage of the external device 5 is achieved, ensuring that the circuit is automatically disconnected when the voltage is too high. The voltage-stabilizing diode D1 is turned on when the voltage exceeds its breakdown voltage, and the conduction state of the third transistor Q3 and the fourth transistor Q4 is controlled to ensure that the circuit is automatically disconnected when the voltage is too high, thereby protecting the safety of the entire circuit.

[0051] Further, if Figure 6 As shown, the display control module 1 includes a first sub-display control module 15 and a second sub-display control module 17, and the power module 2 includes a first sub-power module 16 and a second sub-power module 18, the first sub-display control module 15 is connected to the first sub-power module 16, and the second sub-display control module 17 is connected to the second sub-power module 18.

[0052] Specifically, the display control module 1 includes a first sub-display control module 15 and a second sub-display control module 17. The first sub-display control module 15 is used to control the display content and operation of the first display screen. The module can be an LCD display screen control module or an EPD display screen control module, depending on the design of the electronic table card. The second sub-display control module 17 is another part of the electronic table card, which is used to control the display content and operation of the second display screen. Similarly, the second sub-display control module 17 can be an LCD control module or an EPD control module, depending on the design of the electronic table card. The first sub-power module 16 provides power to the first sub-display control module 15. The module can be an independent battery or other power supply device to ensure the normal operation of the first display screen. The second sub-power module 18 provides power to the second sub-display control module 17. The module can also be an independent battery or other power supply device to ensure the normal operation of the second display screen. When the power of any power module 2 is less than or equal to the preset power, it can be powered by the backup power module 4 to ensure uninterrupted display. That is, the first display control module 1 is configured to send a low-power signal to the charging management module 3 when the power level of the first power module 2 is less than or equal to the preset power level, and the second display control module 1 is configured to send a low-power signal to the charging management module 3 when the power level of the second power module 2 is less than or equal to the preset power level.

[0053] The display control module and power module work independently, ensuring that even if one module has a problem, the other module can still work normally, improving the reliability and redundancy of the system. The independent display control module and power module allow the electronic table sign to be flexibly configured with different types of display screens to meet different application requirements.

[0054] Further, if Figure 8 As shown, the first switch 9 includes a first transistor Q1, and the second switch 10 includes a second transistor Q2.

[0055] Specifically, the first transistor Q1 serves as the first switch 9, and its control end (i.e., base) is connected to the signal output end of the external device 5 and the display control module 1. The first pole (i.e., collector) of the first transistor Q1 is connected to the control end (i.e., gate) of the second transistor Q2. The second pole (i.e., emitter) of the first transistor Q1 is grounded. The second transistor Q2 serves as the second switch 10, and its first pole (i.e., source) is connected to the first pin M1 of the MCU6. The second pole (i.e., drain) of the second transistor Q2 is connected to the power supply end of the display control module 1. When the external device 5 is connected and provides a charging signal, or when the display control module 1 detects insufficient power and sends a power shortage signal, the first transistor Q1 will be turned on after receiving these signals, and a path will be formed between its collector and emitter. When the first transistor Q1 is turned on, its collector voltage drops, causing the control end voltage of the second transistor Q2 connected thereto to also drop, and the second transistor Q2 is turned on. When the second transistor Q2 is turned on, the external device 5 or MCU6 supplies power to the display control module 1 through the second transistor Q2.

[0056] It should be noted that the switch unit 8 also includes a VBUS_C terminal connected to the external device 5, a VCHG_5V_EN terminal connected to the first sub-display control module 15, and an EPD_CH_EN terminal connected to the second sub-display control module 17. The first sub-display control module 15 sends a power-deficient signal through the VCHG_5V_EN terminal, and the second sub-display control module 17 sends a power-deficient signal through the EPD_CH_EN terminal; the VBUS_C terminal is also grounded to the eighth capacitor C8 through the second diode D2, the VCHG_5V_EN terminal is also grounded to the eighth capacitor C8 through the third diode D3, and the EPD_CH_EN terminal is also grounded to the eighth capacitor C8 through the fourth diode D4. The second diode D2, the third diode D3, and the fourth diode D4 are used to prevent current backflow, and the eighth capacitor C8 is used for filtering; the first transistor Q1 is connected to the VBUS_C terminal, the VCHG_5V_EN terminal, and the EPD_CH_EN terminal through the seventh resistor R7, and is connected to the eighth capacitor C8 through the eighth resistor R8. The seventh resistor R7 and the eighth resistor R8 can limit the current passing through the base of the first transistor Q1 to prevent the first transistor Q1 from being damaged by excessive current; the switch unit 8 also includes a VOUT terminal connected to the first pin M1 of the MCU6, and the VOUT terminal is grounded through a ninth capacitor C9 for filtering. A tenth resistor R10 and an eleventh resistor R11 are connected between the first electrode (source) and the control terminal (gate) of the second transistor Q2, and a ninth resistor R9 is connected between the tenth resistor R10 and the first electrode (collector) of the first transistor Q1; a tenth capacitor C10 is connected between the second electrode (drain) and the control terminal (gate) of the second transistor Q2; the switch unit 8 also includes a VCHAG_5V terminal connected to the first sub-display control module 15 and the second sub-display control module 17, which is used to supply power to the first sub-display control module 15 and the second sub-display control module 17, and the VCHAG_5V terminal is also grounded through the eleventh capacitor C11 and the twelfth capacitor C12 for filtering.

[0057] Through the combination of the first transistor Q1 and the second transistor Q2, the status of the external device 5 and the display control module 1 can be automatically detected, and the power supply source can be automatically switched, reducing the need for human intervention. The use of transistors ensures the continuity and stability of the power supply and avoids display interruptions caused by insufficient power. Whether the external device 5 is connected or the backup power supply is started, it can be flexibly responded to ensure that the display control module 1 always obtains a stable power supply.

[0058] Further, if Figure 7 As shown, the direction switching unit 11 includes a fifth transistor Q5.

[0059] Specifically, the first electrode (i.e., the drain) of the fifth transistor Q5 is connected to the overvoltage protection unit 7. The control end (i.e., the gate) of the fifth transistor Q5 is connected to the third pin M3 of MCU6. The second electrode (i.e., the source) of the fifth transistor Q5 is connected to the first pin M1 of MCU6. When the external device 5 is connected to the electronic table card and sends a signal to be charged, the circuit detection node N1 detects the signal and transmits it to the fourth pin M4 of MCU6. MCU6 determines that the external device 5 needs to be charged through the detected signal to be charged, and sends a reverse switching signal through the third pin M3. When the control end of the fifth transistor Q5 receives the reverse switching signal, the power of the backup power module 4 is turned on and output to the external device 5 through the fifth transistor Q5.

[0060] It should be noted that the direction switching unit 11 also includes a VOUT terminal connected to the first pin M1 of MCU6, and a VBUSG terminal connected to the first pin M1 of MCU6, and a sixth resistor R6 and a seventh capacitor C7 are connected between the VOUT terminal and the VBUSG terminal. The sixth resistor R6 is used for current limiting and voltage division, and the seventh capacitor C7 is used for filtering.

[0061] The direction switching unit 11 enables the electronic table card not only to receive power from the external device 5, but also to provide power to the external device 5 when necessary, thereby improving the versatility of the device. The MCU 6 controls the conduction of the fifth transistor Q5 by detecting the charging signal of the external device 5, thereby realizing the flexible use of the backup power module 4.

[0062] The transistors used in this embodiment can all be triodes (Transistor), which is a semiconductor device widely used in electronic circuits as amplifiers and switches. There are two main types of triodes: bipolar transistors (BJT, Bipolar Junction Transistor) and field-effect transistors (FET, Field-Effect Transistor). Bipolar transistors are three-terminal devices composed of two PN junctions, with three pins: base (Base), collector (Collector), and emitter (Emitter). According to its structure, it can be divided into NPN type and PNP type. NPN type triode consists of a P-type semiconductor sandwiched between two N-type semiconductors. When a positive voltage is applied to the base (B) and current flows into it, the electrons in the emitter (E) are injected into the base region. These electrons quickly diffuse to the collector (C) in the base region to form a collector current. The collector current (Ic) is mainly determined by the emitter current (Ie), while the base current (Ib) is very small. PNP type triode consists of an N-type semiconductor sandwiched between two P-type semiconductors. When a negative voltage is applied to the base (B) and current flows out of it, holes in the emitter (E) are injected into the base region. These holes quickly diffuse to the collector (C) in the base region, forming a collector current. The collector current (Ic) is mainly determined by the emitter current (Ie), while the base current (Ib) is very small. A field effect transistor (FET) is a voltage-controlled device with three pins: gate, drain, and source. According to its structure, it can be divided into a junction field effect transistor (JFET) and an insulated gate field effect transistor (MOSFET). A junction field effect transistor (JFET) consists of an N-type or P-type semiconductor channel and two PN junctions. The gate (G) voltage controls the width of the channel, thereby controlling the current from the source (S) to the drain (D). When the gate voltage changes, the conductivity of the channel also changes, thereby regulating the current. An insulated gate field effect transistor (MOSFET) consists of a metal oxide semiconductor structure and is available in two types: N-channel and P-channel. The gate (G) voltage controls the conductivity of the channel through the insulating layer. When the gate voltage changes, the conductivity of the channel also changes, thereby adjusting the current from the source (S) to the drain (D). Transistors can be used to amplify signals. In the amplifier circuit, a small input signal controls a larger collector (or drain) current through the base (or gate), thereby achieving signal amplification. Transistors can also be used as switches. In the switching circuit, the transistor switches between the saturation region and the cutoff region to achieve switching control of the circuit.

[0063] An embodiment of the present application also provides an electronic table card, and the display device includes the electronic table card circuit provided by the above embodiment.

[0064] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0065] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0066] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0067] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0068] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. An electronic table card circuit, characterized in that: include: A display control module, a power module connected to the display control module, a charging management module connected to the display control module, and a backup power module connected to the charging management module, wherein the charging management module is also connected to an external device; The display control module is configured to send a low-power signal to the charging management module when the power of the power module is less than or equal to a preset power; The charging management module is configured to control the backup power module to supply power to the display control module under the control of a power-deficit signal, and to supply power to the backup power module and the display control module under the control of a charging signal sent by an external device.

2. The electronic table card circuit according to claim 1, characterized in that: The charging management module includes: an MCU, an overvoltage protection unit and a switch unit connected to a first pin of the MCU, a second pin of the MCU connected to the backup power supply module, the switch unit is also connected to the display control module, and the overvoltage protection unit and the switch unit are also connected to an external device; The overvoltage protection unit is configured to be turned on when the voltage of the external device is less than or equal to a preset voltage, so as to send a charging signal of the external device to the MCU; The switch unit is configured to be turned on under the control of a power-deficit signal so that the MCU controls the backup power module to supply power to the display control module, or to be turned on under the control of a charging signal so that an external device supplies power to the display control module.

3. The electronic table card circuit according to claim 2, characterized in that: The switch unit includes: a first switch and a second switch; the control end of the first switch is connected to the external device and the display control module, the first pole of the first switch is connected to the control end of the second switch, and the second pole of the first switch is grounded; the first pole of the second switch is connected to the first pin of the MCU, and the second pole of the second switch is connected to the display control module; The first switch is configured to be turned on under the control of a charging signal of the external device or a power-deficient signal of the display control module, so as to turn on the second switch, and the overvoltage protection unit or MCU supplies power to the display control module through the second switch.

4. The electronic table card circuit according to claim 2, characterized in that: include: A direction switching unit, wherein a first pole of the direction switching unit is connected to the overvoltage protection unit, a control end of the direction switching unit is connected to a third pin of the MCU, a second pole of the direction switching unit is connected to a first pin of the MCU, and a circuit detection node is further provided between the direction switching unit and the overvoltage protection unit, and the circuit detection node is connected to a fourth pin of the MCU; The MCU is configured to send a reverse switching signal through a third pin when a charging signal of an external device is detected on a circuit detection node; The direction switching unit is configured to be turned on under the control of a reverse switching signal sent by the third pin of the MCU, so that the MCU controls the backup power supply module to supply power to the external device.

5. The electronic table card circuit according to claim 4, characterized in that: The overvoltage protection unit includes a voltage stabilizer, a third switch and a fourth switch, the voltage stabilizer is connected to an external device, the control end of the third switch is connected to the voltage stabilizer and the external device, the first pole of the third switch is connected to the external device, the second pole of the third switch is connected to the control end of the fourth switch, the first pole of the fourth switch is connected to the external device, and the second pole of the fourth switch is connected to the first pole of the direction switching unit; The regulator is configured to be disconnected when the voltage of the external device is less than or equal to a preset voltage, so that the third switch is disconnected and the fourth switch is turned on, and to be turned on when the voltage of the external device is greater than the preset voltage, so that the third switch is turned on and the fourth switch is disconnected.

6. The electronic table card circuit according to claim 5, characterized in that: The voltage regulator includes a voltage regulator diode, a cathode of the voltage regulator diode is connected to an external device, an anode of the voltage regulator diode is grounded, the third switch includes a third transistor, and the fourth switch includes a fourth transistor.

7. The electronic table card circuit according to claim 3, characterized in that: The first switch includes a first transistor, and the second switch includes a second transistor.

8. The electronic table card circuit according to claim 4, characterized in that: The direction switching unit includes a fifth transistor.

9. The electronic table card circuit according to claim 4, characterized in that: The display control module includes a first sub-display control module and a second sub-display control module, the power module includes a first sub-power module and a second sub-power module, the first sub-display control module is connected to the first sub-power module, and the second sub-display control module is connected to the second sub-power module.

10. An electronic table card, characterized in that: The electronic table card circuit comprises any one of claims 1-9.

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