Screen control circuit, system and display device

Abstract

The application relates to a screen control circuit, system and device. The screen control circuit comprises a voltage source module, a level input module, a first switch module, a delay module and a second switch module. The first switch module is connected with the voltage source module, the level input module and the delay module. The delay module is configured to output a signal input by the level input module to the first switch module after delay. The second switch module is connected with the voltage source module. The second switch module is configured to receive a signal output by the voltage source module when the first switch module is turned on, and to output the voltage from the power positive pole of the voltage source module to the power receiving end of the screen through the second switch module after the second switch module is turned on. The technical scheme provided by the application can reduce the risk of screen damage caused by too fast power-on speed, and prolong the service life of the screen.

Description

Technical Field

[0001] This application relates to the field of displays, and in particular to a screen control circuit, system, and display device. Background Technology

[0002] LCD (Liquid Crystal Display) panels are widely used in electronic products such as televisions, mobile phones, and monitors due to their advantages of being lightweight, thin, and low-power. If the display panel of an electronic device is constantly lit when not in use, the device's energy consumption will be very high. From an energy-saving perspective, if an electronic device is used frequently, its display panel needs to be frequently turned on and off. However, frequent on / off switching can cause problems such as black screens, distorted images, or even screen failure, indirectly shortening the lifespan of the electronic device. Utility Model Content

[0003] Therefore, it is necessary to provide a screen control circuit, system, and display device to address the problem of screen damage caused by frequent use of electronic devices.

[0004] On one hand, this application provides a screen control circuit, the screen control circuit including a first switch module connected to the voltage source module, the level input module and the delay module; the delay module is configured to output the signal input by the level input module to the first switch module after delay; a second switch module is connected to the voltage source module; the second switch module is configured to receive the signal output by the voltage source module when the first switch module is turned on, and after the second switch module is turned on, to allow voltage to be output from the positive power terminal of the voltage source module through the second switch module to the power receiving terminal of the screen.

[0005] Optionally, the delay module is an RC delay circuit.

[0006] Optionally, the RC delay circuit includes a resistor unit and a capacitor unit; one end of the resistor unit is connected to the output terminal of the first switching module; the other end is grounded; one end of the capacitor unit is connected to the output terminal of the first switching module, and the other end is used to connect to the power receiving terminal of the screen; the resistance value of the resistor unit is adjustable; and / or, the capacitance value of the capacitor unit is adjustable.

[0007] Optionally, the resistor unit includes multiple resistors; among the multiple resistors, at least two resistors are connected in series or at least two resistors are connected in parallel.

[0008] Optionally, the resistor unit further includes at least one relay; the relay is connected in parallel or in series with one or more resistors in the resistor unit, so that the resistance value of the resistor unit can be adjusted within a preset range.

[0009] Optionally, the capacitor unit includes multiple capacitors; among the multiple capacitors, at least two capacitors are connected in series, or at least two capacitors are connected in parallel.

[0010] Optionally, the capacitor unit further includes at least one relay, which is connected in parallel or in series with the capacitor in the capacitor unit and is configured to adjust the resistance value of the capacitor unit so that the capacitance value of the capacitor unit is adjusted within a preset range.

[0011] Optionally, the first switching module includes a transistor; the base of the transistor is connected to the output terminal of the level input module; the collector of the transistor is connected to the output terminal of the voltage source module; and the emitter of the transistor is connected to the input terminal of the delay module.

[0012] On the other hand, this application also provides a screen control system, which includes the screen control circuit described in the above embodiments.

[0013] Optionally, the screen control system further includes a sound wave monitoring module and a control module; the sound wave monitoring module is used to monitor whether there is a person in the target area; the control module is used to receive the monitoring results of the sound wave monitoring module and analyze the duration of no one's presence based on the monitoring results; the control module is also used to control the screen to enter a semi-sleep state when the duration of no one's presence in the target area accumulates to a first preset duration; and / or, the control module is also used to control the screen to enter a deep sleep state when the duration of no one's presence in the target area accumulates to a second preset duration; and / or, the control module is also used to control the screen to wake up when the screen is in a semi-sleep state and there is a person in the target area.

[0014] Optionally, the screen control system further includes a control module, wherein the voltage source module includes multiple different voltage input terminals; at least two of the voltage input terminals are matched with different voltage input values; the control module is also used to adjust the resistance value and / or capacitance value of the delay circuit according to a preset rule based on the voltage value input by the voltage input terminal selected by the voltage source module.

[0015] In another aspect, this application also provides a display device that includes the screen control circuit described in the above embodiments; or, the display device includes the screen control system described in the above embodiments.

[0016] The embodiments provided in this application include a delay module in the screen control circuit to extend the time it takes for the level input module to send a high-level signal to the first switch module, thereby delaying the turn-on of the first switch module. Only when the first switch module is turned on can the voltage source module send a signal to the second switch module to control the turn-on of the second switch module. This allows the voltage to be output from the power supply of the voltage source module to the power receiving end of the screen through the second switch module, thus reducing the screen's power-on speed, reducing the risk of screen damage due to slow power-on speed, and extending the screen's lifespan. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a screen control circuit provided in one embodiment of this application.

[0018] Figure 2 This is a schematic diagram of a screen control circuit provided in one embodiment of this application.

[0019] Figure 3(a) is a schematic diagram of a screen control circuit provided in one embodiment of this application.

[0020] Figure 3(b) is a schematic diagram of another screen control circuit provided in one embodiment of this application.

[0021] Figure 4 This is a schematic diagram of another screen control circuit provided in one embodiment of this application.

[0022] Figure 5(a) is a schematic diagram of another screen control circuit provided in one embodiment of this application.

[0023] Figure 5(b) is a schematic diagram of another screen control circuit provided in one embodiment of this application.

[0024] Figure 6 This is a schematic diagram of another screen control circuit provided in one embodiment of this application.

[0025] Figure 7 This is a schematic diagram of the structure of a screen control system provided in one embodiment of this application.

[0026] Figure 8 This is a schematic diagram of a multi-source input screen control circuit provided in one embodiment of this application.

[0027] Explanation of reference numerals in the attached figures

[0028] 100. Voltage source module; 200. Level input module; 300. First switch module; 400. Delay module; 500. Second switch module; R1. First resistor; R2. Second resistor; R3. Resistor unit; R4. Fourth resistor; C1. First capacitor; C2. Capacitor unit; Q1. Transistor; Q2. MOSFET; D. Diode; K. Relay; 10. Acoustic wave module; 20. Control module; 30. Screen backlight module. Detailed Implementation

[0029] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0030] LCD (Liquid Crystal Display) panels are widely used in electronic products such as televisions, mobile phones, and monitors due to their advantages of light weight, thinness, and low power consumption. The power consumption of an LCD mainly consists of the backlight module (accounting for 60%-80% of the total power consumption), the driving circuit (including TFT thin-film transistor arrays and signal processing chips), and the control unit. If the backlight module of the display is left on for an extended period, it will consume a significant amount of energy, and the circuit components will also experience heat loss over time. Therefore, the LCD should be turned off when not in use and turned on when someone is using it. This may result in the LCD being turned on multiple times a day. However, sometimes, unstable power supply to the screen can cause problems such as excessively rapid power-on or excessively large pulses, leading to black screens, distorted screens, or even screen failure, indirectly shortening the lifespan of the LCD.

[0031] Therefore, it is necessary to provide a screen control circuit that can delay the power-on speed of the LCD by adding a delay module 400, thereby solving the technical problems of black screen, distorted screen or even broken screen caused by unstable screen power supply.

[0032] See Figure 1 This specification provides a screen control circuit. The screen control circuit includes a voltage source module 100, a level input module 200, a first switch module 300, a delay module 400, and a second switch module 500;

[0033] The first switch module 300 is connected to the voltage source module 100, the level input module 200, and the delay module 400; the delay module 400 is configured to output the signal input from the level input module 200 to the first switch module 300 after a delay.

[0034] The second switch module 500 is connected to the voltage source module 100; the second switch module 500 is configured to receive the signal output by the voltage source module 100 when the first switch module 300 is turned on, and after the second switch module 500 is turned on, the voltage can be output from the positive power terminal of the voltage source module 100 through the second switch module 500 to the power receiving terminal of the screen.

[0035] In this embodiment, the voltage source module 100 serves as a power supply unit, providing a stable voltage to subsequent circuits and acting as the energy input source for the screen control circuit. The level input module 200 is used to input level signals as a trigger signal source, determining whether the display screen needs to be turned on. The delay module 400 is connected to the first switch module 300 and can be used to receive signals input from the level module, thereby reducing the speed at which the first switch module 300 receives signals from the level input module 200 and extends the conduction time of the first switch module 300. After the first switch module 300 is turned on, the second switch module 500 is powered by the voltage source module 100 and determines the circuit's output state according to preset switching logic.

[0036] Please see Figure 2 In this embodiment, the level input module 200 includes a power on / off level, a first resistor R1, a second resistor R2, and a first capacitor C1. The power on / off level is used to control the power supply according to an external control signal. If the user wants to turn on the LCD, the power on / off level outputs a high level. If the user wants to turn off the LCD, the power on / off level is low. One end of the first resistor R1 is connected to the output terminal of the power on / off level, and the other end is connected to an RC filter circuit composed of the second resistor R2 and the first capacitor C1. The first resistor R1 is a current-limiting resistor to prevent damage to the circuit when the input level is abnormal. The second resistor R2 and the first capacitor C1 form an RC filter circuit to filter high-frequency interference in the input level, making the level signal output by the power on / off level more stable.

[0037] In this embodiment, the first switching module 300 can be a transistor Q1. When the power supply switching level input is high, the base of the transistor Q1 is energized and conducts, providing a path for the subsequent delay module 400 and the second switching module 500; when the power supply switching level is low, it is cut off, cutting off the path to the subsequent stage.

[0038] In this embodiment, the voltage source module 100 includes a power input terminal and a fourth resistor R4. One end of the fourth resistor R4 is connected to the power input terminal, and the other end of the fourth resistor R4 is connected to the first switch module 300 and the second switch module 500. The voltage source module 100 provides operating voltage for the entire screen control circuit, while the fourth resistor R4 acts as a current limiter and voltage divider to ensure stable operation of the module.

[0039] In this embodiment, the second switching module 500 includes a MOSFET Q2 and a diode D. The gate of the MOSFET Q2 is connected to the output terminal of the first switching module 300, receiving control signals from the preceding stage. When the gate receives a high level, the MOSFET is turned on; when it receives a low level, the MOSFET is turned off, realizing the switching control of the subsequent circuit. The source of the MOSFET Q2 is directly connected to the input terminal of the voltage source module 100, serving as the current inflow point when the MOSFET is on. The drain of the MOSFET Q2 is connected to the power receiving terminal of the screen, providing voltage to the subsequent load when it is on. The anode of the diode D is connected to the source of the MOSFET and is also connected to the power supply of the voltage source module 100 via a line. The cathode of the diode D is connected to the drain of Q2 and is connected to the power receiving terminal of the screen. When the MOSFET Q2 is turned off, it provides a reverse current path for the subsequent circuit, preventing voltage spikes from damaging the MOSFET Q2.

[0040] Please see Figure 2 In some embodiments, the delay module 400 is an RC delay circuit.

[0041] In some cases, when the screen control circuit is first powered on, the voltage supplying the screen is not stable enough. This can cause problems such as a black screen, a distorted screen, or even screen damage due to issues like the screen powering on too quickly or having too large a pulse.

[0042] In this embodiment, by adding an RC circuit to the screen control circuit to delay the turn-on time of the first switching module 300, the turn-on time of the MOSFET is indirectly delayed. After the power is turned on, the capacitor charges slowly, and the transistor Q1 only turns on after the base voltage of the transistor Q1 reaches the threshold.

[0043] In some embodiments, the RC delay circuit includes a resistor unit R3 and a capacitor unit C2; one end of the resistor unit R3 is connected to the output terminal of the first switch module 300; the other end is grounded; one end of the capacitor unit C2 is connected to the output terminal of the first switch module 300, and the other end is used to connect to the power receiving terminal of the screen; the resistance value of the resistor unit R3 is adjustable; and / or, the capacitance value of the capacitor unit C2 is adjustable.

[0044] In some cases, to meet diverse delay time requirements in different scenarios, it is necessary to improve the flexibility, adaptability, and practicality of the circuit. Therefore, the power-on slope of the screen can be controlled by adjusting the resistance value of resistor R3 or the capacitance value of capacitor C2 in the RC delay circuit, or by changing both the resistance value of resistor R3 and the capacitance value of capacitor C2. For example, increasing the capacitance value of capacitor C2 lengthens the charging time, thus extending the conduction time of the first switching module 300 while keeping the input voltage constant. Alternatively, increasing the resistance value of resistor R3 reduces the charging current, further extending the conduction time of the first switching module 300 while keeping the input voltage constant.

[0045] Please refer to Figures 3(a) and 3(b). In some embodiments, the resistor unit R3 includes a plurality of resistors, wherein at least two of the resistors are connected in series or at least two of the resistors are connected in parallel.

[0046] In some cases, the fine-tuning range and precision of a single resistor in an RC delay circuit are limited. While the resistance of a single resistor changes continuously, the target value of the delay circuit often needs to precisely correspond to a specific resistance value, making accurate adjustment difficult. Therefore, multiple resistors can be used in the RC delay circuit.

[0047] Please refer to Figure 3(a). In this embodiment, the total resistance of the series resistors is the sum of the resistance values ​​of each individual resistor. The main advantage in the delay circuit is that it significantly increases the total resistance value, extending the maximum delay time. When the resistance value of a single resistor is insufficient to meet the long delay requirement (e.g., 1MΩ is needed, but only a 100kΩ resistor is available), connecting multiple resistors in series can quickly expand the total resistance value (e.g., 10 100kΩ resistors connected in series to obtain 1MΩ), thereby extending the delay time. Furthermore, the hierarchical series connection, combined with a switch, achieves a "coarse adjustment + fine adjustment" combination. The main resistor (100kΩ) is responsible for "coarse adjustment" (determining the order of magnitude of the delay, such as 1 second); the smaller series resistors (1kΩ, 500Ω) are switched via a switch to handle "fine adjustment." This combination can cover a wide range of delays (e.g., 0.5-5 seconds) and achieve high precision (e.g., error ±0.01 seconds) through fine-tuning with small resistors.

[0048] Please refer to Figure 3(b). In this embodiment, the total resistance of the parallel resistors is the sum of the reciprocals of the individual resistors. The advantages in delay circuits are as follows: It reduces the total resistance, shortening the minimum delay time. When a single resistor value is too large (e.g., 1MΩ causing excessive delay), the parallel resistors can reduce the total resistance (e.g., 1MΩ in parallel with 1MΩ equals 500kΩ), thereby shortening the delay time. This is suitable for scenarios requiring short delays (e.g., milliseconds). Fine-tuning with small resistance values ​​improves accuracy. For example, if the base resistance is 10kΩ, and fine-tuning to 9.5kΩ is needed, a 200kΩ resistor can be connected in parallel (total resistance ≈ 9.52kΩ). This "minor reduction" of a large resistance is achieved through parallel connection of small resistance values, offering more flexibility than directly replacing the resistor.

[0049] In this embodiment, the "hybrid advantage" of series-parallel combination is achieved by balancing range and accuracy. In practical circuits, series-parallel combinations are often used. For example, a large resistor (e.g., 10kΩ + 20kΩ) is first connected in series to determine the basic delay (e.g., 3 seconds); then small resistors (e.g., 1kΩ, 2kΩ) are connected in parallel. By switching the resistors, the total resistance is finely adjusted (e.g., connecting 1kΩ in parallel reduces the total resistance, shortening the delay by 0.2 seconds). The core advantage of this design is that series connection expands the delay range, parallel connection achieves fine correction, and the fixed resistance value combination avoids the adjustment error and stability problems of a single potentiometer.

[0050] In some embodiments, the resistor unit R3 further includes at least one relay K; the relay K is connected in parallel or in series with the resistors in the resistor unit R3, and the relay K is connected in parallel or in series with one or more resistors in the resistor unit R3, so that the resistance value of the resistor unit R3 is adjusted within a preset range.

[0051] In some cases, the resistance value of a standard fixed resistor is determined during manufacturing (e.g., 10kΩ ± 5%), and once soldered into the circuit, its resistance value cannot be changed. If the actual delay time deviates from the target value (e.g., designed for 1 second, measured for 0.8 seconds), it cannot be corrected by adjusting the resistor; the resistor must be replaced, which is cumbersome and inefficient.

[0052] In this embodiment, a relay K is used in conjunction with the resistor unit R3 in the RC delay circuit. Its main function is to dynamically switch the resistance value by controlling the on / off state of the relay K, allowing for flexible adjustment of the delay time without replacing the resistor. The relay K can be connected in series with a resistor in parallel with the resistor unit R3, or in parallel with a series resistor, to control the current flow in the RC delay circuit. Specifically, for example, in... Figure 4In this circuit, relay K is connected in parallel with the second resistor in resistor unit R3. When relay K is closed, current does not flow through the second resistor, thus reducing the resistance value of resistor unit R3. When relay K is open, current flows through the second resistor, thus increasing the resistance value of resistor unit R3.

[0053] Please refer to Figures 5(a) and 5(b). In some embodiments, the capacitor unit C2 includes a plurality of capacitors, wherein at least two of the capacitors are connected in series or at least two of the capacitors are connected in parallel.

[0054] In some cases, besides adjusting the resistance of resistor R3, the capacitance of capacitor C2 can also be adjusted to determine the delay duration of an RC delay circuit. The capacitance change of a single capacitor is discontinuous, but the target value of the delay circuit often needs to precisely correspond to a specific capacitance value, making precise adjustment difficult. Therefore, multiple capacitors can be used in the RC delay circuit.

[0055] Please refer to Figure 5(a). In this embodiment, the total capacitance of the series capacitors is the sum of the capacitance values ​​of each individual capacitor. The main advantage in the delay circuit is that it significantly increases the total capacitance value, extending the maximum delay time. Furthermore, the hierarchical series connection, combined with a switch, enables a "coarse adjustment + fine adjustment" combination. The main capacitor is responsible for "coarse adjustment" (determining the order of magnitude of the delay, such as 1 second); the smaller series capacitors, switched by a switch, are responsible for "fine adjustment." This combination can cover a wide range of delays (e.g., 0.5-5 seconds) and achieve high precision (e.g., error ±0.01 seconds) through fine-tuning with small capacitors.

[0056] Please refer to Figure 5(b). In this embodiment, the total resistance of the parallel resistors is the sum of the reciprocals of the resistances of each capacitor. The advantages in the delay circuit are as follows: It reduces the total capacitance, shortening the minimum delay time. When the capacitance of a single capacitor is too large, the parallel capacitors can reduce the total capacitance, thereby shortening the delay time, making it suitable for scenarios requiring short delays (such as milliseconds). Fine-tuning the small capacitor value improves accuracy. Achieving a "micro-reduction" of the large capacitor through parallel connection of small capacitors is more flexible than directly replacing the capacitor.

[0057] In this embodiment, the "hybrid advantage" of series-parallel combination is achieved by balancing range and accuracy. In practical circuits, series-parallel combinations are often used. For example, a large capacitor is first connected in series to determine the basic delay (e.g., 3 seconds); then a small capacitor is connected in parallel, and the total capacitance value is finely adjusted by switching. The core advantage of this design is that series connection extends the delay range, parallel connection achieves fine correction, and the fixed resistance combination of capacitors avoids the adjustment error and stability problems of a single potentiometer.

[0058] Please see Figure 6In some embodiments, the capacitor unit C2 further includes at least one relay K; the relay K is connected in parallel or in series with the capacitor in the capacitor unit C2, and is configured to adjust the resistance value of the capacitor unit C2 so that the capacitance value of the capacitor unit C2 is adjusted within a preset range.

[0059] In some cases, the capacitance value of a standard fixed capacitor is determined during manufacturing and cannot be changed once it is soldered into the circuit. If the actual delay time deviates from the target value (e.g., designed for 1 second, measured for 0.8 seconds), it cannot be corrected by adjusting the capacitor; the capacitor must be replaced, which is cumbersome and inefficient.

[0060] In this embodiment, a relay K is used in conjunction with the capacitor unit C2 in the RC delay circuit. Its main function is to dynamically switch the capacitor value by controlling the on / off state of the relay K, allowing for flexible adjustment of the delay time without replacing the capacitor. The relay K can be connected in series with a capacitor in parallel with the capacitor unit C2, or in parallel with a series resistor, to control the current flow in the RC delay circuit. Specifically, for example, in... Figure 6 In the circuit, relay K is connected in series with the second capacitor in capacitor unit C2. When relay K is in the closed state, current does not flow through the second capacitor, thus increasing the capacitance value of capacitor unit C2. When relay K is in the open state, current flows through the second capacitor, thus decreasing the capacitance value of resistor unit R3.

[0061] Please see Figure 2 In some embodiments, the first switching module 300 includes a transistor Q1; the base of the transistor Q1 is connected to the output terminal of the level input module 200; the collector of the transistor Q1 is connected to the output terminal of the voltage source module 100; and the emitter of the transistor Q1 is connected to the input terminal of the delay module 400.

[0062] In some cases, the core function of the delay module 400 is to trigger subsequent actions according to a preset time. If the error is too large, it may lead to circuit malfunction and decreased system stability. Therefore, it is necessary to select a suitable first switch module 300 that can trigger the conduction logic in a timely manner to avoid system malfunction.

[0063] In this embodiment, the first switching module 300 can be selected as transistor Q1. When transistor Q1 operates in the saturation region (conduction) and cutoff region (discontinuity), its switching speed is extremely fast (microseconds or even nanoseconds), far exceeding that of mechanical switches, making it suitable for high-frequency or fast-response scenarios. When the P-ON / OFF input is high (e.g., 5V): current flows through the first resistor R1 to the base of transistor Q1, making the base voltage higher than the emitter voltage, thus saturating and conducting transistor Q1. After conduction, the collector and emitter of transistor Q1 are approximately short-circuited, driving the second switching module 500 to conduct, ultimately resulting in the VCC-OUT output voltage.

[0064] One embodiment of this application also provides a screen control system, which may include the screen control circuit described in the above embodiments.

[0065] The screen control circuit described in the embodiments of this application can be integrated into an LS (Level Shift) chip. For a detailed description of the screen control circuit, please refer to the screen control circuit described in the above embodiments. The embodiments of this application will not repeat the details.

[0066] In practical applications, screen control systems can be used to control any product or component with a display function, such as mobile phones, tablets, monitors, laptops, and navigators.

[0067] Please see Figure 7 The screen control system further includes a sound wave monitoring module and a control module 20; the sound wave monitoring module is used to monitor whether there is a person in the target area; the control module 20 is used to receive the monitoring results of the sound wave monitoring module and analyze the duration of no one's presence based on the monitoring results; the control module 20 is also used to control the screen to be in a semi-sleep state when the duration of no one's presence in the target area accumulates to a first preset duration; and / or, the control module 20 is also used to control the screen to be in a deep sleep state when the duration of no one's presence in the target area accumulates to a second preset duration; and / or, the control module 20 is also used to control the screen to wake up when the screen is in a semi-sleep state and there is a person in the target area.

[0068] In some cases, many household appliances, such as televisions, continue to play sound and images even when no one is watching for extended periods, which is a significant waste of electricity. Existing technologies use infrared detection to check if the backlight is off, but infrared is susceptible to interference and its detection is inaccurate. Therefore, a system capable of detecting television viewers could be provided, automatically turning off the LCD screen backlight module 30 when viewers are present, thus saving energy.

[0069] In this embodiment, the screen control system includes a sound wave monitoring module and a processing module. First, the sound wave module 10 emits ultrasonic signals and then receives ultrasonic echo signals reflected from obstacles in the target area. The Doppler effect of sound can then be used to analyze whether there are viewers in the target area, and the monitoring results are fed back to the processing module. The processing module can then decide whether to turn off the screen backlight module 30 based on the monitoring results from the sound wave module 10. That is, when no one is detected watching for a short period (e.g., 10 minutes), the TV enters a semi-sleep mode (i.e., the backlight and power amplifier are turned off, leaving only low-power modules such as the DDR and remote control for quick startup). This saves power and allows for quick startup, so that when viewers return after 10 minutes, they can quickly turn on the TV and watch the content, improving the user experience. When viewers are detected reappearing (e.g., at the 15-minute mark), the TV will automatically resume, and viewers can continue watching normally. When the TV detects that no one has been watching for an extended period (e.g., more than 30 minutes), it will enter a deep sleep mode (i.e., turn off all power-consuming modules, including the screen backlight, amplifier, DDR, etc.), leaving only low-power modules such as the remote control on so that viewers can wake up the TV using the remote control or buttons the next time they want to watch it, thus further saving energy.

[0070] In this embodiment, the acoustic monitoring module is an ultrasonic monitoring module. Ultrasonic waves are mechanical vibration waves with frequencies higher than 20kHz, which do not involve electromagnetic radiation or ionizing radiation and cause no damage to human tissue or electronic equipment. Ultrasonic sensors have a simple structure (consisting of a transmitter and a receiver), and their production and maintenance costs are far lower than those of radar, cameras, and other similar devices.

[0071] Please see Figure 8 In some embodiments, the voltage source module 100 includes multiple different voltage input terminals; at least two of the voltage input terminals are matched with different voltage input values; the control module 20 is also used to adjust the resistance value and / or capacitance value of the delay circuit according to a preset rule based on the voltage value input by the voltage input terminal selected by the voltage source module 100.

[0072] One embodiment of this application also provides a display device, which may include the screen control circuit described in the above embodiments, or the screen control system described in the above embodiments.

[0073] The screen control circuit of the embodiments described in this application can be integrated into an LS (Level Shift) chip. For a detailed description of the screen control circuit, please refer to the description of the embodiments described above. The embodiments of this application will not be repeated here.

[0074] In practical applications, the display device can be any product or component with display function, such as a mobile phone, tablet computer, monitor, laptop computer, or navigator.

[0075] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly include at least one of those features. In this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0076] In this application, the various embodiments are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0077] In this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0078] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A screen control circuit, characterized in that, The screen control circuit includes a voltage source module, a level input module, a first switch module, a delay module, and a second switch module; The first switch module is connected to the voltage source module, the level input module, and the delay module; the delay module is configured to output the signal input from the level input module to the first switch module after a delay. The second switch module is connected to the voltage source module; the second switch module is configured to receive the signal output by the voltage source module when the first switch module is turned on, and after the second switch module is turned on, the voltage can be output from the positive terminal of the power supply of the voltage source module through the second switch module to the power receiving terminal of the screen.

2. The screen control circuit according to claim 1, characterized in that, The delay module is an RC delay circuit.

3. The screen control circuit according to claim 2, characterized in that, The RC delay circuit includes a resistor unit and a capacitor unit; one end of the resistor unit is connected to the output terminal of the first switch module; the other end is grounded; one end of the capacitor unit is connected to the output terminal of the first switch module, and the other end is used to connect to the power receiving terminal of the screen. The resistance value of the resistor unit is adjustable; and / or, the capacitance value of the capacitor unit is adjustable.

4. The screen control circuit according to claim 3, characterized in that, The resistor unit includes multiple resistors; among the multiple resistors, at least two resistors are connected in series, or at least two resistors are connected in parallel.

5. The screen control circuit according to claim 4, characterized in that, The resistor unit further includes at least one relay; the relay is connected in parallel or in series with one or more resistors in the resistor unit so that the resistance value of the resistor unit can be adjusted within a preset range.

6. The screen control circuit according to claim 3, characterized in that, The capacitor unit includes multiple capacitors; among the multiple capacitors, at least two capacitors are connected in series, or at least two capacitors are connected in parallel.

7. The screen control circuit according to claim 6, characterized in that, The capacitor unit further includes at least one relay, which is connected in parallel or in series with the capacitor in the capacitor unit and is configured to adjust the resistance value of the capacitor unit so that the capacitance value of the capacitor unit is adjusted within a preset range.

8. The screen control circuit according to claim 1, characterized in that, The first switching module includes a transistor; The base of the transistor is connected to the output terminal of the level input module; the collector of the transistor is connected to the output terminal of the voltage source module; and the emitter of the transistor is connected to the input terminal of the delay module.

9. A screen control system, characterized in that, The screen control system includes the screen control circuit according to any one of claims 1 to 8.

10. The screen control system according to claim 9, characterized in that, The screen control system also includes an acoustic wave monitoring module and a control module; The acoustic wave monitoring module is used to monitor whether there are people in the target area; the control module is used to receive the monitoring results of the acoustic wave monitoring module and analyze the duration of no one being present based on the monitoring results. The control module is also used to put the control screen into a semi-sleep state when the time when no one is present in the target area accumulates to a first preset duration. And / or, the control module is also used to put the control screen into a deep sleep state when the time when no one is present in the target area accumulates to a second preset duration; And / or, the control module is also configured to control the screen to wake up when the screen is in a semi-sleep state and someone is present in the target area.

11. The screen control system according to claim 9, characterized in that, The screen control system also includes a control module; The voltage source module includes multiple different voltage input terminals; at least two of the voltage input terminals are matched with different voltage input values. The control module is also used to adjust the resistance and / or capacitance values ​​of the delay module according to the voltage value input at the voltage input terminal selected by the voltage source module and according to preset rules.

12. A display device, characterized in that, The display device includes the screen control circuit according to any one of claims 1 to 8; Alternatively, the display device may include the screen control system according to any one of claims 9 to 11.

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